/*
* Copyright (c) 2001 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <kandros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/ratelimit.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/addr.h>
#include <linux/jhash.h>
#include <linux/string_helpers.h>
#include <linux/fsnotify.h>
#include <linux/rhashtable.h>
#include <linux/nfs_ssc.h>
#include "xdr4.h"
#include "xdr4cb.h"
#include "vfs.h"
#include "current_stateid.h"
#include "stats.h"
#include "netns.h"
#include "pnfs.h"
#include "filecache.h"
#include "nfs4xdr_gen.h"
#include "trace.h"
#define NFSDDBG_FACILITY NFSDDBG_PROC
#define all_ones {{ ~0, ~0}, ~0}
static const stateid_t one_stateid = {
.si_generation = ~0,
.si_opaque = all_ones,
};
static const stateid_t zero_stateid = {
/* all fields zero */
};
static const stateid_t currentstateid = {
.si_generation = 1,
};
static const stateid_t close_stateid = {
.si_generation = 0xffffffffU,
};
static u64 current_sessionid = 1;
bool nfsd_delegts_enabled __read_mostly = true;
#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
#define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
#define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
/* forward declarations */
static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
static void nfsd4_end_grace(struct nfsd_net *nn);
static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
static void nfsd4_file_hash_remove(struct nfs4_file *fi);
static void deleg_reaper(struct nfsd_net *nn);
static const struct lease_manager_operations nfsd_lease_mng_ops;
/* Locking: */
enum nfsd4_st_mutex_lock_subclass {
OPEN_STATEID_MUTEX = 0,
LOCK_STATEID_MUTEX = 1,
};
/*
* A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
* the refcount on the open stateid to drop.
*/
static DECLARE_WAIT_QUEUE_HEAD(close_wq);
/*
* A waitqueue where a writer to clients/#/ctl destroying a client can
* wait for cl_rpc_users to drop to 0 and then for the client to be
* unhashed.
*/
static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
static struct kmem_cache *client_slab;
static struct kmem_cache *openowner_slab;
static struct kmem_cache *lockowner_slab;
static struct kmem_cache *file_slab;
static struct kmem_cache *stateid_slab;
static struct kmem_cache *deleg_slab;
static struct kmem_cache *odstate_slab;
static struct kmem_cache *async_copy_slab;
static void free_session(struct nfsd4_session *);
static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops;
static const struct nfsd4_callback_ops nfsd4_cb_notify_ops;
static struct workqueue_struct *laundry_wq;
int nfsd4_create_laundry_wq(void)
{
int rc = 0;
laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
if (laundry_wq == NULL)
rc = -ENOMEM;
return rc;
}
void nfsd4_destroy_laundry_wq(void)
{
destroy_workqueue(laundry_wq);
}
static bool is_session_dead(struct nfsd4_session *ses)
{
return ses->se_dead;
}
static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
{
if (atomic_read(&ses->se_ref) > ref_held_by_me)
return nfserr_jukebox;
ses->se_dead = true;
return nfs_ok;
}
static bool is_client_expired(struct nfs4_client *clp)
{
return clp->cl_time == 0;
}
static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
struct nfs4_client *clp)
{
if (clp->cl_state != NFSD4_ACTIVE)
atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
}
static __be32 get_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (is_client_expired(clp))
return nfserr_expired;
atomic_inc(&clp->cl_rpc_users);
nfsd4_dec_courtesy_client_count(nn, clp);
clp->cl_state = NFSD4_ACTIVE;
return nfs_ok;
}
/* must be called under the client_lock */
static inline void
renew_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (is_client_expired(clp)) {
WARN_ON(1);
printk("%s: client (clientid %08x/%08x) already expired\n",
__func__,
clp->cl_clientid.cl_boot,
clp->cl_clientid.cl_id);
return;
}
list_move_tail(&clp->cl_lru, &nn->client_lru);
clp->cl_time = ktime_get_boottime_seconds();
nfsd4_dec_courtesy_client_count(nn, clp);
clp->cl_state = NFSD4_ACTIVE;
}
/*
* Finish a cl_rpc_users unpin with the client_lock held. A
* revocation walk clears @renew so the client whose state it is
* revoking is not revived; every other caller renews the lease of
* a still-active client.
*/
static void __put_client_locked(struct nfs4_client *clp, bool renew)
{
if (is_client_expired(clp))
wake_up_all(&expiry_wq);
else if (renew)
renew_client_locked(clp);
}
static void put_client_renew_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (atomic_dec_and_test(&clp->cl_rpc_users))
__put_client_locked(clp, true);
}
static void put_client_renew(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
return;
__put_client_locked(clp, true);
spin_unlock(&nn->client_lock);
}
static void put_client_no_renew_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (atomic_dec_and_test(&clp->cl_rpc_users))
__put_client_locked(clp, false);
}
static void put_client_no_renew(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
return;
__put_client_locked(clp, false);
spin_unlock(&nn->client_lock);
}
static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
{
__be32 status;
if (is_session_dead(ses))
return nfserr_badsession;
status = get_client_locked(ses->se_client);
if (status)
return status;
atomic_inc(&ses->se_ref);
return nfs_ok;
}
static void nfsd4_put_session_locked(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
free_session(ses);
put_client_renew_locked(clp);
}
static void nfsd4_put_session(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
spin_lock(&nn->client_lock);
nfsd4_put_session_locked(ses);
spin_unlock(&nn->client_lock);
}
static struct nfsd4_blocked_lock *
find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
struct nfsd_net *nn)
{
struct nfsd4_blocked_lock *cur, *found = NULL;
spin_lock(&nn->blocked_locks_lock);
list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
if (fh_match(fh, &cur->nbl_fh)) {
list_del_init(&cur->nbl_list);
WARN_ON(list_empty(&cur->nbl_lru));
list_del_init(&cur->nbl_lru);
found = cur;
break;
}
}
spin_unlock(&nn->blocked_locks_lock);
if (found)
locks_delete_block(&found->nbl_lock);
return found;
}
static struct nfsd4_blocked_lock *
find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
struct nfsd_net *nn)
{
struct nfsd4_blocked_lock *nbl;
nbl = find_blocked_lock(lo, fh, nn);
if (!nbl) {
nbl = kmalloc_obj(*nbl);
if (nbl) {
INIT_LIST_HEAD(&nbl->nbl_list);
INIT_LIST_HEAD(&nbl->nbl_lru);
fh_copy_shallow(&nbl->nbl_fh, fh);
locks_init_lock(&nbl->nbl_lock);
kref_init(&nbl->nbl_kref);
nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
&nfsd4_cb_notify_lock_ops,
NFSPROC4_CLNT_CB_NOTIFY_LOCK);
}
}
return nbl;
}
static void
free_nbl(struct kref *kref)
{
struct nfsd4_blocked_lock *nbl;
nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
locks_release_private(&nbl->nbl_lock);
kfree(nbl);
}
static void
free_blocked_lock(struct nfsd4_blocked_lock *nbl)
{
locks_delete_block(&nbl->nbl_lock);
kref_put(&nbl->nbl_kref, free_nbl);
}
/* A blocked lock's flc_owner is its nfs4_lockowner. */
static struct nfs4_client *
nbl_client(struct nfsd4_blocked_lock *nbl)
{
struct nfs4_lockowner *lo;
lo = (struct nfs4_lockowner *)nbl->nbl_lock.c.flc_owner;
return lo->lo_owner.so_client;
}
static void
remove_blocked_locks(struct nfs4_lockowner *lo)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfsd4_blocked_lock *nbl;
LIST_HEAD(reaplist);
/* Dequeue all blocked locks */
spin_lock(&nn->blocked_locks_lock);
while (!list_empty(&lo->lo_blocked)) {
nbl = list_first_entry(&lo->lo_blocked,
struct nfsd4_blocked_lock,
nbl_list);
list_del_init(&nbl->nbl_list);
WARN_ON(list_empty(&nbl->nbl_lru));
list_move(&nbl->nbl_lru, &reaplist);
}
spin_unlock(&nn->blocked_locks_lock);
/* Now free them */
while (!list_empty(&reaplist)) {
nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
nbl_lru);
list_del_init(&nbl->nbl_lru);
free_blocked_lock(nbl);
}
}
static bool
nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
{
struct nfsd4_blocked_lock *nbl = container_of(cb,
struct nfsd4_blocked_lock, nbl_cb);
locks_delete_block(&nbl->nbl_lock);
return true;
}
static int
nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
{
trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
/*
* Since this is just an optimization, we don't try very hard if it
* turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
* just quit trying on anything else.
*/
switch (task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, 1 * HZ);
return 0;
default:
return 1;
}
}
static void
nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
{
struct nfsd4_blocked_lock *nbl = container_of(cb,
struct nfsd4_blocked_lock, nbl_cb);
free_blocked_lock(nbl);
}
static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
.prepare = nfsd4_cb_notify_lock_prepare,
.done = nfsd4_cb_notify_lock_done,
.release = nfsd4_cb_notify_lock_release,
.opcode = OP_CB_NOTIFY_LOCK,
};
/*
* We store the NONE, READ, WRITE, and BOTH bits separately in the
* st_{access,deny}_bmap field of the stateid, in order to track not
* only what share bits are currently in force, but also what
* combinations of share bits previous opens have used. This allows us
* to enforce the recommendation in
* https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
* the server return an error if the client attempt to downgrade to a
* combination of share bits not explicable by closing some of its
* previous opens.
*
* This enforcement is arguably incomplete, since we don't keep
* track of access/deny bit combinations; so, e.g., we allow:
*
* OPEN allow read, deny write
* OPEN allow both, deny none
* DOWNGRADE allow read, deny none
*
* which we should reject.
*
* But you could also argue that our current code is already overkill,
* since it only exists to return NFS4ERR_INVAL on incorrect client
* behavior.
*/
static unsigned int
bmap_to_share_mode(unsigned long bmap)
{
int i;
unsigned int access = 0;
for (i = 1; i < 4; i++) {
if (test_bit(i, &bmap))
access |= i;
}
return access;
}
/* set share access for a given stateid */
static inline void
set_access(u32 access, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << access;
WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
stp->st_access_bmap |= mask;
}
/* clear share access for a given stateid */
static inline void
clear_access(u32 access, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << access;
WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
stp->st_access_bmap &= ~mask;
}
/* test whether a given stateid has access */
static inline bool
test_access(u32 access, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << access;
return (bool)(stp->st_access_bmap & mask);
}
/* set share deny for a given stateid */
static inline void
set_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << deny;
WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
stp->st_deny_bmap |= mask;
}
/* clear share deny for a given stateid */
static inline void
clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << deny;
WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
stp->st_deny_bmap &= ~mask;
}
/* test whether a given stateid is denying specific access */
static inline bool
test_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
unsigned char mask = 1 << deny;
return (bool)(stp->st_deny_bmap & mask);
}
static int nfs4_access_to_omode(u32 access)
{
switch (access & NFS4_SHARE_ACCESS_BOTH) {
case NFS4_SHARE_ACCESS_READ:
return O_RDONLY;
case NFS4_SHARE_ACCESS_WRITE:
return O_WRONLY;
case NFS4_SHARE_ACCESS_BOTH:
return O_RDWR;
}
WARN_ON_ONCE(1);
return O_RDONLY;
}
static inline int
access_permit_read(struct nfs4_ol_stateid *stp)
{
return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
test_access(NFS4_SHARE_ACCESS_WRITE, stp);
}
static inline int
access_permit_write(struct nfs4_ol_stateid *stp)
{
return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
test_access(NFS4_SHARE_ACCESS_BOTH, stp);
}
static inline struct nfs4_stateowner *
nfs4_get_stateowner(struct nfs4_stateowner *sop)
{
atomic_inc(&sop->so_count);
return sop;
}
static int
same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
{
return (sop->so_owner.len == owner->len) &&
0 == memcmp(sop->so_owner.data, owner->data, owner->len);
}
static struct nfs4_openowner *
find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
struct nfs4_client *clp)
{
struct nfs4_stateowner *so;
lockdep_assert_held(&clp->cl_lock);
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
so_strhash) {
if (!so->so_is_open_owner)
continue;
if (same_owner_str(so, &open->op_owner))
return openowner(nfs4_get_stateowner(so));
}
return NULL;
}
static inline u32
opaque_hashval(const void *ptr, int nbytes)
{
unsigned char *cptr = (unsigned char *) ptr;
u32 x = 0;
while (nbytes--) {
x *= 37;
x += *cptr++;
}
return x;
}
void
put_nfs4_file(struct nfs4_file *fi)
{
if (refcount_dec_and_test(&fi->fi_ref)) {
nfsd4_file_hash_remove(fi);
WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
kfree_rcu(fi, fi_rcu);
}
}
static struct nfsd_file *
find_writeable_file_locked(struct nfs4_file *f)
{
struct nfsd_file *ret;
lockdep_assert_held(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
if (!ret)
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
return ret;
}
static struct nfsd_file *
find_writeable_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
spin_lock(&f->fi_lock);
ret = find_writeable_file_locked(f);
spin_unlock(&f->fi_lock);
return ret;
}
static struct nfsd_file *
find_readable_file_locked(struct nfs4_file *f)
{
struct nfsd_file *ret;
lockdep_assert_held(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
if (!ret)
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
return ret;
}
static struct nfsd_file *
find_readable_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
spin_lock(&f->fi_lock);
ret = find_readable_file_locked(f);
spin_unlock(&f->fi_lock);
return ret;
}
struct nfsd_file *
find_any_file(struct nfs4_file *f)
{
struct nfsd_file *ret;
if (!f)
return NULL;
spin_lock(&f->fi_lock);
ret = nfsd_file_get(f->fi_fds[O_RDWR]);
if (!ret) {
ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
if (!ret)
ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
}
spin_unlock(&f->fi_lock);
return ret;
}
static struct nfsd_file *find_any_file_locked(struct nfs4_file *f)
{
lockdep_assert_held(&f->fi_lock);
if (f->fi_fds[O_RDWR])
return f->fi_fds[O_RDWR];
if (f->fi_fds[O_WRONLY])
return f->fi_fds[O_WRONLY];
if (f->fi_fds[O_RDONLY])
return f->fi_fds[O_RDONLY];
return NULL;
}
static atomic_long_t num_delegations;
unsigned long max_delegations;
/*
* Open owner state (share locks)
*/
/* hash tables for lock and open owners */
#define OWNER_HASH_BITS 8
#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
{
unsigned int ret;
ret = opaque_hashval(ownername->data, ownername->len);
return ret & OWNER_HASH_MASK;
}
static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp;
static const struct rhashtable_params nfs4_file_rhash_params = {
.key_len = sizeof_field(struct nfs4_file, fi_inode),
.key_offset = offsetof(struct nfs4_file, fi_inode),
.head_offset = offsetof(struct nfs4_file, fi_rlist),
/*
* Start with a single page hash table to reduce resizing churn
* on light workloads.
*/
.min_size = 256,
.automatic_shrinking = true,
};
/*
* Check if courtesy clients have conflicting access and resolve it if possible
*
* access: is op_share_access if share_access is true.
* Check if access mode, op_share_access, would conflict with
* the current deny mode of the file 'fp'.
* access: is op_share_deny if share_access is false.
* Check if the deny mode, op_share_deny, would conflict with
* current access of the file 'fp'.
* stp: skip checking this entry.
* new_stp: normal open, not open upgrade.
*
* Function returns:
* false - access/deny mode conflict with normal client.
* true - no conflict or conflict with courtesy client(s) is resolved.
*/
static bool
nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
struct nfs4_ol_stateid *stp, u32 access, bool share_access)
{
struct nfs4_ol_stateid *st;
bool resolvable = true;
unsigned char bmap;
struct nfsd_net *nn;
struct nfs4_client *clp;
lockdep_assert_held(&fp->fi_lock);
list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
/* ignore lock stateid */
if (st->st_openstp)
continue;
if (st == stp && new_stp)
continue;
/* check file access against deny mode or vice versa */
bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
if (!(access & bmap_to_share_mode(bmap)))
continue;
clp = st->st_stid.sc_client;
if (try_to_expire_client(clp))
continue;
resolvable = false;
break;
}
if (resolvable) {
clp = stp->st_stid.sc_client;
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
}
return resolvable;
}
static void
__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
{
lockdep_assert_held(&fp->fi_lock);
if (access & NFS4_SHARE_ACCESS_WRITE)
atomic_inc(&fp->fi_access[O_WRONLY]);
if (access & NFS4_SHARE_ACCESS_READ)
atomic_inc(&fp->fi_access[O_RDONLY]);
}
static __be32
nfs4_file_get_access(struct nfs4_file *fp, u32 access)
{
lockdep_assert_held(&fp->fi_lock);
/* Does this access mode make sense? */
if (access & ~NFS4_SHARE_ACCESS_BOTH)
return nfserr_inval;
/* Does it conflict with a deny mode already set? */
if ((access & fp->fi_share_deny) != 0)
return nfserr_share_denied;
__nfs4_file_get_access(fp, access);
return nfs_ok;
}
static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
{
/* Common case is that there is no deny mode. */
if (deny) {
/* Does this deny mode make sense? */
if (deny & ~NFS4_SHARE_DENY_BOTH)
return nfserr_inval;
if ((deny & NFS4_SHARE_DENY_READ) &&
atomic_read(&fp->fi_access[O_RDONLY]))
return nfserr_share_denied;
if ((deny & NFS4_SHARE_DENY_WRITE) &&
atomic_read(&fp->fi_access[O_WRONLY]))
return nfserr_share_denied;
}
return nfs_ok;
}
static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
{
might_lock(&fp->fi_lock);
if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
struct nfsd_file *f1 = NULL;
struct nfsd_file *f2 = NULL;
swap(f1, fp->fi_fds[oflag]);
if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
swap(f2, fp->fi_fds[O_RDWR]);
spin_unlock(&fp->fi_lock);
if (f1)
nfsd_file_put(f1);
if (f2)
nfsd_file_put(f2);
}
}
static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
{
WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
if (access & NFS4_SHARE_ACCESS_WRITE)
__nfs4_file_put_access(fp, O_WRONLY);
if (access & NFS4_SHARE_ACCESS_READ)
__nfs4_file_put_access(fp, O_RDONLY);
}
/*
* Allocate a new open/delegation state counter. This is needed for
* pNFS for proper return on close semantics.
*
* Note that we only allocate it for pNFS-enabled exports, otherwise
* all pointers to struct nfs4_clnt_odstate are always NULL.
*/
static struct nfs4_clnt_odstate *
alloc_clnt_odstate(struct nfs4_client *clp)
{
struct nfs4_clnt_odstate *co;
co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
if (co) {
co->co_client = clp;
refcount_set(&co->co_odcount, 1);
}
return co;
}
static void
hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
{
struct nfs4_file *fp = co->co_file;
lockdep_assert_held(&fp->fi_lock);
list_add(&co->co_perfile, &fp->fi_clnt_odstate);
}
static inline void
get_clnt_odstate(struct nfs4_clnt_odstate *co)
{
if (co)
refcount_inc(&co->co_odcount);
}
static void
put_clnt_odstate(struct nfs4_clnt_odstate *co)
{
struct nfs4_file *fp;
if (!co)
return;
fp = co->co_file;
if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
list_del(&co->co_perfile);
spin_unlock(&fp->fi_lock);
nfsd4_return_all_file_layouts(co->co_client, fp);
kmem_cache_free(odstate_slab, co);
}
}
static struct nfs4_clnt_odstate *
find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
{
struct nfs4_clnt_odstate *co;
struct nfs4_client *cl;
if (!new)
return NULL;
cl = new->co_client;
spin_lock(&fp->fi_lock);
list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
if (co->co_client == cl) {
get_clnt_odstate(co);
goto out;
}
}
co = new;
co->co_file = fp;
hash_clnt_odstate_locked(new);
out:
spin_unlock(&fp->fi_lock);
return co;
}
struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
void (*sc_free)(struct nfs4_stid *))
{
struct nfs4_stid *stid;
int new_id;
stid = kmem_cache_zalloc(slab, GFP_KERNEL);
if (!stid)
return NULL;
idr_preload(GFP_KERNEL);
spin_lock(&cl->cl_lock);
/* Reserving 0 for start of file in nfsdfs "states" file: */
new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
spin_unlock(&cl->cl_lock);
idr_preload_end();
if (new_id < 0)
goto out_free;
stid->sc_free = sc_free;
stid->sc_client = cl;
stid->sc_stateid.si_opaque.so_id = new_id;
stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
/* Will be incremented before return to client: */
refcount_set(&stid->sc_count, 1);
spin_lock_init(&stid->sc_lock);
INIT_LIST_HEAD(&stid->sc_cp_list);
return stid;
out_free:
kmem_cache_free(slab, stid);
return NULL;
}
/*
* Publish a COPY_NOTIFY stateid in nn->s2s_cp_stateids and link it onto the
* parent's sc_cp_list. That IDR holds only COPY_NOTIFY stateids.
*/
static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
struct nfs4_stid *p_stid)
{
int new_id;
stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
idr_preload(GFP_KERNEL);
spin_lock(&nn->s2s_cp_lock);
new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
if (new_id >= 0) {
struct nfs4_cpntf_state *cps =
container_of(stid, struct nfs4_cpntf_state, cp_stateid);
stid->cs_stid.si_opaque.so_id = new_id;
stid->cs_stid.si_generation = 1;
/*
* Set cs_type and link onto sc_cp_list under the same lock
* that installed the IDR entry, so a concurrent
* manage_cpntf_state() sees either no entry or a fully
* linked cp_list.
*/
stid->cs_type = NFS4_COPYNOTIFY_STID;
list_add(&cps->cp_list, &p_stid->sc_cp_list);
}
spin_unlock(&nn->s2s_cp_lock);
idr_preload_end();
if (new_id < 0)
return 0;
return 1;
}
/* sc_free for a copy offload stateid; runs from nfs4_put_stid(). */
static void nfsd4_free_async_copy_stid(struct nfs4_stid *stid)
{
struct nfsd4_async_copy *copy =
container_of(stid, struct nfsd4_async_copy, cp_stid);
if (copy->copy_task)
put_task_struct(copy->copy_task);
kfree(copy->cp_copy.cp_src);
kmem_cache_free(async_copy_slab, copy);
}
/*
* Allocate durable async COPY state. The offload stateid is a first-class
* nfs4_stid (SC_TYPE_COPY) in the client's cl_stateids, so it is per-client
* and uses the common refcounting/teardown. find_stateid_locked() hides it;
* OFFLOAD_CANCEL/OFFLOAD_STATUS find it via clp->async_copies.
*/
struct nfsd4_async_copy *nfs4_alloc_copy_stid(struct nfs4_client *clp)
{
struct nfs4_stid *stid;
stid = nfs4_alloc_stid(clp, async_copy_slab, nfsd4_free_async_copy_stid);
if (!stid)
return NULL;
stid->sc_type = SC_TYPE_COPY;
/* RFC 7862 Section 4.8: a copy offload stateid's seqid MUST NOT be 0 */
stid->sc_stateid.si_generation = 1;
return container_of(stid, struct nfsd4_async_copy, cp_stid);
}
struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
struct nfs4_stid *p_stid)
{
struct nfs4_cpntf_state *cps;
cps = kzalloc_obj(struct nfs4_cpntf_state);
if (!cps)
return NULL;
/* So a stale list_del_init() before linking is a no-op. */
INIT_LIST_HEAD(&cps->cp_list);
cps->cpntf_time = ktime_get_boottime_seconds();
/*
* Fully initialize the entry before nfs4_init_cp_state() publishes it,
* since a concurrent OFFLOAD_CANCEL could then free it. Take an extra
* reference for the caller (dropped with nfs4_put_cpntf_state()).
*/
memcpy(&cps->cp_p_stateid, &p_stid->sc_stateid, sizeof(stateid_t));
memcpy(&cps->cp_p_clid, &p_stid->sc_client->cl_clientid,
sizeof(clientid_t));
refcount_set(&cps->cp_stateid.cs_count, 2);
if (!nfs4_init_cp_state(nn, &cps->cp_stateid, p_stid))
goto out_free;
return cps;
out_free:
kfree(cps);
return NULL;
}
/*
* Drop the parent's reference on an already-unlinked cpntf entry. If a
* concurrent holder still owns a reference, its nfs4_put_cpntf_state() does
* the final free.
*
* nn->s2s_cp_lock must be held.
*/
static void put_cpntf_state_unlinked_locked(struct nfs4_cpntf_state *cps)
{
WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
WARN_ON_ONCE(!list_empty(&cps->cp_list));
if (refcount_dec_and_test(&cps->cp_stateid.cs_count))
kfree(cps);
}
/*
* Unhash from the IDR and sc_cp_list. Gated on list_empty() to avoid
* evicting a recycled so_id.
*/
static void nfsd4_unhash_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
{
lockdep_assert_held(&nn->s2s_cp_lock);
if (!list_empty(&cps->cp_list)) {
list_del_init(&cps->cp_list);
idr_remove(&nn->s2s_cp_stateids, cps->cp_stateid.cs_stid.si_opaque.so_id);
}
}
/*
* Revoke a copy-notify stateid: unlink it from the IDR and sc_cp_list first
* so no new finder can discover it, then drop the membership reference. Every
* revoke path (cancel, laundromat, drain) must use this rather than
* _free_cpntf_state_locked(), which unlinks only at refcount zero and so could
* let a second revoke free the entry under a concurrent reader.
*
* nn->s2s_cp_lock must be held.
*/
static void revoke_cpntf_state_locked(struct nfsd_net *nn,
struct nfs4_cpntf_state *cps)
{
nfsd4_unhash_cpntf_state(nn, cps);
put_cpntf_state_unlinked_locked(cps);
}
static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
{
struct nfs4_cpntf_state *cps, *tmp;
struct nfsd_net *nn;
nn = net_generic(net, nfsd_net_id);
spin_lock(&nn->s2s_cp_lock);
/*
* Revoke unlinks each entry before dropping the parent's reference, so
* the drain terminates in one pass per entry regardless of cs_count; a
* concurrent holder does the final kfree via nfs4_put_cpntf_state().
*/
list_for_each_entry_safe(cps, tmp, &stid->sc_cp_list, cp_list)
revoke_cpntf_state_locked(nn, cps);
spin_unlock(&nn->s2s_cp_lock);
}
static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
{
struct nfs4_stid *stid;
stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
if (!stid)
return NULL;
return openlockstateid(stid);
}
/*
* As the sc_free callback of deleg, this may be called by nfs4_put_stid
* in nfsd_break_one_deleg.
* Considering nfsd_break_one_deleg is called with the flc->flc_lock held,
* this function mustn't ever sleep.
*/
static void nfs4_free_deleg(struct nfs4_stid *stid)
{
struct nfs4_delegation *dp = delegstateid(stid);
WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
kmem_cache_free(deleg_slab, stid);
atomic_long_dec(&num_delegations);
}
/*
* When we recall a delegation, we should be careful not to hand it
* out again straight away.
* To ensure this we keep a pair of bloom filters ('new' and 'old')
* in which the filehandles of recalled delegations are "stored".
* If a filehandle appear in either filter, a delegation is blocked.
* When a delegation is recalled, the filehandle is stored in the "new"
* filter.
* Every 30 seconds we swap the filters and clear the "new" one,
* unless both are empty of course. This results in delegations for a
* given filehandle being blocked for between 30 and 60 seconds.
*
* Each filter is 256 bits. We hash the filehandle to 32bit and use the
* low 3 bytes as hash-table indices.
*
* 'blocked_delegations_lock', which is always taken in block_delegations(),
* is used to manage concurrent access. Testing does not need the lock
* except when swapping the two filters.
*/
static DEFINE_SPINLOCK(blocked_delegations_lock);
static struct bloom_pair {
int entries, old_entries;
time64_t swap_time;
int new; /* index into 'set' */
DECLARE_BITMAP(set[2], 256);
} blocked_delegations;
static int delegation_blocked(struct knfsd_fh *fh)
{
u32 hash;
struct bloom_pair *bd = &blocked_delegations;
if (bd->entries == 0)
return 0;
if (ktime_get_seconds() - bd->swap_time > 30) {
spin_lock(&blocked_delegations_lock);
if (ktime_get_seconds() - bd->swap_time > 30) {
bd->entries -= bd->old_entries;
bd->old_entries = bd->entries;
bd->new = 1-bd->new;
memset(bd->set[bd->new], 0,
sizeof(bd->set[0]));
bd->swap_time = ktime_get_seconds();
}
spin_unlock(&blocked_delegations_lock);
}
hash = jhash(&fh->fh_raw, fh->fh_size, 0);
if (test_bit(hash&255, bd->set[0]) &&
test_bit((hash>>8)&255, bd->set[0]) &&
test_bit((hash>>16)&255, bd->set[0]))
return 1;
if (test_bit(hash&255, bd->set[1]) &&
test_bit((hash>>8)&255, bd->set[1]) &&
test_bit((hash>>16)&255, bd->set[1]))
return 1;
return 0;
}
static void block_delegations(struct knfsd_fh *fh)
{
u32 hash;
struct bloom_pair *bd = &blocked_delegations;
hash = jhash(&fh->fh_raw, fh->fh_size, 0);
spin_lock(&blocked_delegations_lock);
__set_bit(hash&255, bd->set[bd->new]);
__set_bit((hash>>8)&255, bd->set[bd->new]);
__set_bit((hash>>16)&255, bd->set[bd->new]);
if (bd->entries == 0)
bd->swap_time = ktime_get_seconds();
bd->entries += 1;
spin_unlock(&blocked_delegations_lock);
}
static struct nfs4_delegation *
__alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
struct nfs4_clnt_odstate *odstate, u32 dl_type,
void (*sc_free)(struct nfs4_stid *))
{
struct nfs4_delegation *dp;
struct nfs4_stid *stid;
long n;
if (delegation_blocked(&fp->fi_fhandle))
return NULL;
n = atomic_long_inc_return(&num_delegations);
if (n < 0 || n > max_delegations)
goto out_dec;
stid = nfs4_alloc_stid(clp, deleg_slab, sc_free);
if (stid == NULL)
goto out_dec;
/*
* delegation seqid's are never incremented. The 4.1 special
* meaning of seqid 0 isn't meaningful, really, but let's avoid
* 0 anyway just for consistency and use 1.
*/
dp = delegstateid(stid);
dp->dl_stid.sc_stateid.si_generation = 1;
INIT_LIST_HEAD(&dp->dl_perfile);
INIT_LIST_HEAD(&dp->dl_perclnt);
INIT_LIST_HEAD(&dp->dl_recall_lru);
dp->dl_clnt_odstate = odstate;
get_clnt_odstate(odstate);
dp->dl_type = dl_type;
dp->dl_retries = 1;
dp->dl_recalled = false;
get_nfs4_file(fp);
dp->dl_stid.sc_file = fp;
nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
&nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
return dp;
out_dec:
atomic_long_dec(&num_delegations);
return NULL;
}
static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
struct nfs4_clnt_odstate *odstate, u32 dl_type)
{
struct nfs4_delegation *dp;
dp = __alloc_init_deleg(clp, fp, odstate, dl_type, nfs4_free_deleg);
if (!dp)
return NULL;
nfsd4_init_cb(&dp->dl_cb_fattr.ncf_getattr, dp->dl_stid.sc_client,
&nfsd4_cb_getattr_ops, NFSPROC4_CLNT_CB_GETATTR);
dp->dl_cb_fattr.ncf_file_modified = false;
return dp;
}
static void nfs4_free_dir_deleg(struct nfs4_stid *stid)
{
struct nfs4_delegation *dp = delegstateid(stid);
struct nfsd4_cb_notify *ncn = &dp->dl_cb_notify;
int i;
for (i = 0; i < ncn->ncn_evt_cnt; ++i)
nfsd_notify_event_put(ncn->ncn_evt[i]);
kfree(ncn->ncn_nf);
for (i = 0; i < NOTIFY4_PAGE_ARRAY_SIZE; i++) {
if (!ncn->ncn_pages[i])
break;
put_page(ncn->ncn_pages[i]);
}
nfs4_free_deleg(stid);
}
static struct nfs4_delegation *
alloc_init_dir_deleg(struct nfs4_client *clp, struct nfs4_file *fp)
{
struct nfs4_delegation *dp;
struct nfsd4_cb_notify *ncn;
int npages;
dp = __alloc_init_deleg(clp, fp, NULL, NFS4_OPEN_DELEGATE_READ, nfs4_free_dir_deleg);
if (!dp)
return NULL;
ncn = &dp->dl_cb_notify;
npages = alloc_pages_bulk(GFP_KERNEL, NOTIFY4_PAGE_ARRAY_SIZE, ncn->ncn_pages);
if (npages != NOTIFY4_PAGE_ARRAY_SIZE) {
nfs4_put_stid(&dp->dl_stid);
return NULL;
}
ncn->ncn_nf = kcalloc(NOTIFY4_EVENT_QUEUE_SIZE, sizeof(*ncn->ncn_nf), GFP_KERNEL);
if (!ncn->ncn_nf) {
nfs4_put_stid(&dp->dl_stid);
return NULL;
}
spin_lock_init(&ncn->ncn_lock);
nfsd4_init_cb(&ncn->ncn_cb, dp->dl_stid.sc_client,
&nfsd4_cb_notify_ops, NFSPROC4_CLNT_CB_NOTIFY);
return dp;
}
void
nfs4_put_stid(struct nfs4_stid *s)
{
struct nfs4_file *fp = s->sc_file;
struct nfs4_client *clp = s->sc_client;
struct svc_export *exp;
might_lock(&clp->cl_lock);
if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
wake_up_all(&close_wq);
return;
}
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
atomic_dec(&s->sc_client->cl_admin_revoked);
/* Read under cl_lock to serialize with drop_stid_export(). */
exp = s->sc_export;
nfs4_free_cpntf_statelist(clp->net, s);
spin_unlock(&clp->cl_lock);
s->sc_free(s);
if (exp)
exp_put(exp);
if (fp)
put_nfs4_file(fp);
}
void
nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
{
stateid_t *src = &stid->sc_stateid;
spin_lock(&stid->sc_lock);
if (unlikely(++src->si_generation == 0))
src->si_generation = 1;
memcpy(dst, src, sizeof(*dst));
spin_unlock(&stid->sc_lock);
}
static void put_deleg_file(struct nfs4_file *fp)
{
struct nfsd_file *rnf = NULL;
struct nfsd_file *nf = NULL;
spin_lock(&fp->fi_lock);
if (--fp->fi_delegees == 0) {
nf = rcu_dereference_protected(fp->fi_deleg_file,
lockdep_is_held(&fp->fi_lock));
RCU_INIT_POINTER(fp->fi_deleg_file, NULL);
swap(rnf, fp->fi_rdeleg_file);
}
spin_unlock(&fp->fi_lock);
if (nf)
nfsd_file_put(nf);
if (rnf) {
nfsd_file_put(rnf);
nfs4_file_put_access(fp, NFS4_SHARE_ACCESS_READ);
}
}
static void nfsd4_finalize_deleg_timestamps(struct nfs4_delegation *dp, struct file *f)
{
/* don't do anything if FMODE_NOCMTIME isn't set */
if ((READ_ONCE(f->f_mode) & FMODE_NOCMTIME) == 0)
return;
spin_lock(&f->f_lock);
f->f_mode &= ~FMODE_NOCMTIME;
spin_unlock(&f->f_lock);
/* was it never written? */
if (!dp->dl_written)
return;
/* did it get a setattr for the timestamps at some point? */
if (dp->dl_setattr)
return;
/* Stamp everything to "now" */
nfsd_update_cmtime_attr(f, ATTR_ATIME);
}
static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
{
struct nfs4_file *fp = dp->dl_stid.sc_file;
struct nfsd_file *nf = rcu_dereference_protected(fp->fi_deleg_file, 1);
WARN_ON_ONCE(!fp->fi_delegees);
nfsd4_finalize_deleg_timestamps(dp, nf->nf_file);
kernel_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
nfsd_fsnotify_recalc_mask(nf);
put_deleg_file(fp);
}
static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
{
put_clnt_odstate(dp->dl_clnt_odstate);
nfs4_unlock_deleg_lease(dp);
nfs4_put_stid(&dp->dl_stid);
}
/**
* nfs4_delegation_exists - Discover if this delegation already exists
* @clp: a pointer to the nfs4_client we're granting a delegation to
* @fp: a pointer to the nfs4_file we're granting a delegation on
*
* Return:
* On success: true iff an existing delegation is found
*/
static bool
nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
{
struct nfs4_delegation *searchdp = NULL;
struct nfs4_client *searchclp = NULL;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->deleg_lock);
lockdep_assert_held(&fp->fi_lock);
list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
searchclp = searchdp->dl_stid.sc_client;
if (clp == searchclp) {
return true;
}
}
return false;
}
/**
* hash_delegation_locked - Add a delegation to the appropriate lists
* @dp: a pointer to the nfs4_delegation we are adding.
* @fp: a pointer to the nfs4_file we're granting a delegation on
*
* Return:
* On success: NULL if the delegation was successfully hashed.
*
* On error: -EAGAIN if one was previously granted to this
* nfs4_client for this nfs4_file. Delegation is not hashed.
*
*/
static int
hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
{
struct nfs4_client *clp = dp->dl_stid.sc_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->deleg_lock);
lockdep_assert_held(&fp->fi_lock);
lockdep_assert_held(&clp->cl_lock);
if (nfs4_delegation_exists(clp, fp))
return -EAGAIN;
refcount_inc(&dp->dl_stid.sc_count);
dp->dl_stid.sc_type = SC_TYPE_DELEG;
list_add(&dp->dl_perfile, &fp->fi_delegations);
list_add(&dp->dl_perclnt, &clp->cl_delegations);
return 0;
}
static bool delegation_hashed(struct nfs4_delegation *dp)
{
return !(list_empty(&dp->dl_perfile));
}
static bool
unhash_delegation_locked(struct nfs4_delegation *dp, unsigned short statusmask)
{
struct nfs4_file *fp = dp->dl_stid.sc_file;
struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
nfsd_net_id);
lockdep_assert_held(&nn->deleg_lock);
if (!delegation_hashed(dp))
return false;
if (statusmask == SC_STATUS_REVOKED &&
dp->dl_stid.sc_client->cl_minorversion == 0)
statusmask = SC_STATUS_CLOSED;
dp->dl_stid.sc_status |= statusmask;
if (statusmask & SC_STATUS_ADMIN_REVOKED)
atomic_inc(&dp->dl_stid.sc_client->cl_admin_revoked);
/* Ensure that deleg break won't try to requeue it */
++dp->dl_time;
spin_lock(&fp->fi_lock);
list_del_init(&dp->dl_perclnt);
list_del_init(&dp->dl_recall_lru);
list_del_init(&dp->dl_perfile);
spin_unlock(&fp->fi_lock);
return true;
}
static void destroy_delegation(struct nfs4_delegation *dp)
{
bool unhashed;
struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
nfsd_net_id);
spin_lock(&nn->deleg_lock);
unhashed = unhash_delegation_locked(dp, SC_STATUS_CLOSED);
spin_unlock(&nn->deleg_lock);
if (unhashed)
destroy_unhashed_deleg(dp);
}
/**
* revoke_delegation - perform nfs4 delegation structure cleanup
* @dp: pointer to the delegation
*
* This function assumes that it's called either from the administrative
* interface (nfsd4_revoke_states()) that's revoking a specific delegation
* stateid or it's called from a laundromat thread (nfsd4_landromat()) that
* determined that this specific state has expired and needs to be revoked
* (both mark state with the appropriate stid sc_status mode). It is also
* assumed that a reference was taken on the @dp state. This function
* consumes that reference.
*
* If this function finds that the @dp state is SC_STATUS_FREED it means
* that a FREE_STATEID operation for this stateid has been processed and
* we can proceed to removing it from recalled list. However, if @dp state
* isn't marked SC_STATUS_FREED, it means we need place it on the cl_revoked
* list and wait for the FREE_STATEID to arrive from the client. At the same
* time, we need to mark it as SC_STATUS_FREEABLE to indicate to the
* nfsd4_free_stateid() function that this stateid has already been added
* to the cl_revoked list and that nfsd4_free_stateid() is now responsible
* for removing it from the list. Inspection of where the delegation state
* in the revocation process is protected by the clp->cl_lock.
*/
static void revoke_delegation(struct nfs4_delegation *dp)
{
struct nfs4_client *clp = dp->dl_stid.sc_client;
WARN_ON(!list_empty(&dp->dl_recall_lru));
WARN_ON_ONCE(dp->dl_stid.sc_client->cl_minorversion > 0 &&
!(dp->dl_stid.sc_status &
(SC_STATUS_REVOKED | SC_STATUS_ADMIN_REVOKED)));
trace_nfsd_stid_revoke(&dp->dl_stid);
spin_lock(&clp->cl_lock);
if (dp->dl_stid.sc_status & SC_STATUS_FREED) {
list_del_init(&dp->dl_recall_lru);
goto out;
}
list_add(&dp->dl_recall_lru, &clp->cl_revoked);
dp->dl_stid.sc_status |= SC_STATUS_FREEABLE;
out:
spin_unlock(&clp->cl_lock);
destroy_unhashed_deleg(dp);
}
/*
* SETCLIENTID state
*/
static unsigned int clientid_hashval(u32 id)
{
return id & CLIENT_HASH_MASK;
}
static unsigned int clientstr_hashval(struct xdr_netobj name)
{
return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
}
/*
* A stateid that had a deny mode associated with it is being released
* or downgraded. Recalculate the deny mode on the file.
*/
static void
recalculate_deny_mode(struct nfs4_file *fp)
{
struct nfs4_ol_stateid *stp;
u32 old_deny;
spin_lock(&fp->fi_lock);
old_deny = fp->fi_share_deny;
fp->fi_share_deny = 0;
list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
if (fp->fi_share_deny == old_deny)
break;
}
spin_unlock(&fp->fi_lock);
}
static void
reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
{
int i;
bool change = false;
for (i = 1; i < 4; i++) {
if ((i & deny) != i) {
change = true;
clear_deny(i, stp);
}
}
/* Recalculate per-file deny mode if there was a change */
if (change)
recalculate_deny_mode(stp->st_stid.sc_file);
}
/* release all access and file references for a given stateid */
static void
release_all_access(struct nfs4_ol_stateid *stp)
{
int i;
struct nfs4_file *fp = stp->st_stid.sc_file;
if (fp && stp->st_deny_bmap != 0)
recalculate_deny_mode(fp);
for (i = 1; i < 4; i++) {
if (test_access(i, stp))
nfs4_file_put_access(stp->st_stid.sc_file, i);
clear_access(i, stp);
}
}
/**
* nfs4_replay_free_cache - release dynamically allocated replay buffer
* @rp: replay cache to reset
*
* If @rp->rp_buf points to a kmalloc'd buffer, free it and reset
* rp_buf to the inline rp_ibuf. Always zeroes rp_buflen.
*/
void nfs4_replay_free_cache(struct nfs4_replay *rp)
{
if (rp->rp_buf != rp->rp_ibuf)
kfree(rp->rp_buf);
rp->rp_buf = rp->rp_ibuf;
rp->rp_buflen = 0;
}
static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
{
nfs4_replay_free_cache(&sop->so_replay);
kfree(sop->so_owner.data);
sop->so_ops->so_free(sop);
}
static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
{
struct nfs4_client *clp = sop->so_client;
might_lock(&clp->cl_lock);
if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
return;
sop->so_ops->so_unhash(sop);
spin_unlock(&clp->cl_lock);
nfs4_free_stateowner(sop);
}
static bool
nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
{
return list_empty(&stp->st_perfile);
}
static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
{
struct nfs4_file *fp = stp->st_stid.sc_file;
lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
if (list_empty(&stp->st_perfile))
return false;
spin_lock(&fp->fi_lock);
list_del_init(&stp->st_perfile);
spin_unlock(&fp->fi_lock);
list_del(&stp->st_perstateowner);
return true;
}
static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
{
struct nfs4_ol_stateid *stp = openlockstateid(stid);
put_clnt_odstate(stp->st_clnt_odstate);
release_all_access(stp);
if (stp->st_stateowner)
nfs4_put_stateowner(stp->st_stateowner);
if (!list_empty(&stid->sc_cp_list))
nfs4_free_cpntf_statelist(stid->sc_client->net, stid);
kmem_cache_free(stateid_slab, stid);
}
static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
{
struct nfs4_ol_stateid *stp = openlockstateid(stid);
struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
struct nfsd_file *nf;
nf = find_any_file(stp->st_stid.sc_file);
if (nf) {
get_file(nf->nf_file);
filp_close(nf->nf_file, (fl_owner_t)lo);
nfsd_file_put(nf);
}
nfs4_free_ol_stateid(stid);
}
/*
* Put the persistent reference to an already unhashed generic stateid, while
* holding the cl_lock. If it's the last reference, then put it onto the
* reaplist for later destruction.
*/
static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
struct list_head *reaplist)
{
struct nfs4_stid *s = &stp->st_stid;
struct nfs4_client *clp = s->sc_client;
lockdep_assert_held(&clp->cl_lock);
WARN_ON_ONCE(!list_empty(&stp->st_locks));
if (!refcount_dec_and_test(&s->sc_count)) {
wake_up_all(&close_wq);
return;
}
idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
atomic_dec(&s->sc_client->cl_admin_revoked);
list_add(&stp->st_locks, reaplist);
}
static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
{
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
if (!unhash_ol_stateid(stp))
return false;
list_del_init(&stp->st_locks);
stp->st_stid.sc_status |= SC_STATUS_CLOSED;
return true;
}
static void release_lock_stateid(struct nfs4_ol_stateid *stp)
{
struct nfs4_client *clp = stp->st_stid.sc_client;
bool unhashed;
spin_lock(&clp->cl_lock);
unhashed = unhash_lock_stateid(stp);
spin_unlock(&clp->cl_lock);
if (unhashed)
nfs4_put_stid(&stp->st_stid);
}
static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
lockdep_assert_held(&clp->cl_lock);
list_del_init(&lo->lo_owner.so_strhash);
}
/*
* Free a list of generic stateids that were collected earlier after being
* fully unhashed.
*/
static void
free_ol_stateid_reaplist(struct list_head *reaplist)
{
struct nfs4_ol_stateid *stp;
struct svc_export *exp;
struct nfs4_file *fp;
might_sleep();
while (!list_empty(reaplist)) {
stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
st_locks);
list_del(&stp->st_locks);
fp = stp->st_stid.sc_file;
exp = stp->st_stid.sc_export;
stp->st_stid.sc_free(&stp->st_stid);
if (exp)
exp_put(exp);
if (fp)
put_nfs4_file(fp);
}
}
static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
struct list_head *reaplist)
{
struct nfs4_ol_stateid *stp;
lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
while (!list_empty(&open_stp->st_locks)) {
stp = list_entry(open_stp->st_locks.next,
struct nfs4_ol_stateid, st_locks);
unhash_lock_stateid(stp);
put_ol_stateid_locked(stp, reaplist);
}
}
static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
struct list_head *reaplist)
{
lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
if (!unhash_ol_stateid(stp))
return false;
release_open_stateid_locks(stp, reaplist);
return true;
}
static void release_open_stateid(struct nfs4_ol_stateid *stp)
{
LIST_HEAD(reaplist);
spin_lock(&stp->st_stid.sc_client->cl_lock);
stp->st_stid.sc_status |= SC_STATUS_CLOSED;
if (unhash_open_stateid(stp, &reaplist))
put_ol_stateid_locked(stp, &reaplist);
spin_unlock(&stp->st_stid.sc_client->cl_lock);
free_ol_stateid_reaplist(&reaplist);
}
static bool nfs4_openowner_unhashed(struct nfs4_openowner *oo)
{
lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
return list_empty(&oo->oo_owner.so_strhash) &&
list_empty(&oo->oo_perclient);
}
static void unhash_openowner_locked(struct nfs4_openowner *oo)
{
struct nfs4_client *clp = oo->oo_owner.so_client;
lockdep_assert_held(&clp->cl_lock);
list_del_init(&oo->oo_owner.so_strhash);
list_del_init(&oo->oo_perclient);
}
static void release_last_closed_stateid(struct nfs4_openowner *oo)
{
struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
nfsd_net_id);
struct nfs4_ol_stateid *s;
spin_lock(&nn->client_lock);
s = oo->oo_last_closed_stid;
if (s) {
list_del_init(&oo->oo_close_lru);
oo->oo_last_closed_stid = NULL;
}
spin_unlock(&nn->client_lock);
if (s)
nfs4_put_stid(&s->st_stid);
}
static void release_openowner(struct nfs4_openowner *oo)
{
struct nfs4_ol_stateid *stp;
struct nfs4_client *clp = oo->oo_owner.so_client;
LIST_HEAD(reaplist);
spin_lock(&clp->cl_lock);
unhash_openowner_locked(oo);
while (!list_empty(&oo->oo_owner.so_stateids)) {
stp = list_first_entry(&oo->oo_owner.so_stateids,
struct nfs4_ol_stateid, st_perstateowner);
if (unhash_open_stateid(stp, &reaplist))
put_ol_stateid_locked(stp, &reaplist);
}
spin_unlock(&clp->cl_lock);
free_ol_stateid_reaplist(&reaplist);
release_last_closed_stateid(oo);
nfs4_put_stateowner(&oo->oo_owner);
}
static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp,
struct super_block *sb,
unsigned int sc_types)
{
unsigned long id = 0;
struct nfs4_stid *stid;
spin_lock(&clp->cl_lock);
while ((stid = idr_get_next_ul(&clp->cl_stateids, &id)) != NULL) {
if ((stid->sc_type & sc_types) &&
stid->sc_status == 0 &&
stid->sc_file->fi_inode->i_sb == sb) {
refcount_inc(&stid->sc_count);
break;
}
id++;
}
spin_unlock(&clp->cl_lock);
return stid;
}
/*
* Release the export reference an admin-revoked stateid holds,
* so the svc_export (and its vfsmount) is not pinned until the
* client issues FREE_STATEID. sc_export is no longer consulted
* once SC_STATUS_ADMIN_REVOKED is set.
*/
static void drop_stid_export(struct nfs4_client *clp,
struct nfs4_stid *stid)
{
struct svc_export *exp;
spin_lock(&clp->cl_lock);
exp = stid->sc_export;
stid->sc_export = NULL;
spin_unlock(&clp->cl_lock);
if (exp)
exp_put(exp);
}
static void revoke_ol_stid(struct nfs4_client *clp,
struct nfs4_ol_stateid *stp)
{
struct nfs4_stid *stid = &stp->st_stid;
lockdep_assert_held(&stp->st_mutex);
spin_lock(&clp->cl_lock);
if (stid->sc_status == 0) {
stid->sc_status |= SC_STATUS_ADMIN_REVOKED;
atomic_inc(&clp->cl_admin_revoked);
spin_unlock(&clp->cl_lock);
if (stid->sc_type == SC_TYPE_LOCK) {
struct nfs4_lockowner *lo =
lockowner(stp->st_stateowner);
struct nfsd_file *nf;
nf = find_any_file(stp->st_stid.sc_file);
if (nf) {
get_file(nf->nf_file);
filp_close(nf->nf_file, (fl_owner_t)lo);
nfsd_file_put(nf);
}
}
release_all_access(stp);
drop_stid_export(clp, stid);
} else
spin_unlock(&clp->cl_lock);
}
static void revoke_one_stid(struct nfsd_net *nn, struct nfs4_client *clp,
struct nfs4_stid *stid)
{
struct nfs4_ol_stateid *stp;
struct nfs4_delegation *dp;
switch (stid->sc_type) {
case SC_TYPE_OPEN:
stp = openlockstateid(stid);
mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
revoke_ol_stid(clp, stp);
mutex_unlock(&stp->st_mutex);
break;
case SC_TYPE_LOCK:
stp = openlockstateid(stid);
mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
revoke_ol_stid(clp, stp);
mutex_unlock(&stp->st_mutex);
break;
case SC_TYPE_DELEG:
/*
* Extra reference guards against concurrent FREE_STATEID.
*/
refcount_inc(&stid->sc_count);
dp = delegstateid(stid);
spin_lock(&nn->deleg_lock);
if (!unhash_delegation_locked(dp, SC_STATUS_ADMIN_REVOKED))
dp = NULL;
spin_unlock(&nn->deleg_lock);
if (dp) {
revoke_delegation(dp);
drop_stid_export(clp, stid);
} else
nfs4_put_stid(stid);
break;
case SC_TYPE_LAYOUT:
spin_lock(&clp->cl_lock);
if (stid->sc_status == 0) {
stid->sc_status |= SC_STATUS_ADMIN_REVOKED;
atomic_inc(&clp->cl_admin_revoked);
}
spin_unlock(&clp->cl_lock);
nfsd4_close_layout(layoutstateid(stid));
drop_stid_export(clp, stid);
break;
}
}
/**
* nfsd4_revoke_states - revoke all nfsv4 states associated with given filesystem
* @nn: used to identify instance of nfsd (there is one per net namespace)
* @sb: super_block used to identify target filesystem
*
* All nfs4 states (open, lock, delegation, layout) held by the server instance
* and associated with a file on the given filesystem will be revoked resulting
* in any files being closed and so all references from nfsd to the filesystem
* being released. Thus nfsd will no longer prevent the filesystem from being
* unmounted.
*
* The clients which own the states will subsequently be notified that the
* states have been "admin-revoked".
*
* Context: Caller must hold nfsd_mutex with NFSD_NET_UP set. Outside
* that window nn->conf_id_hashtbl is unallocated or freed,
* so the walk would dereference a NULL or dangling pointer.
*/
void nfsd4_revoke_states(struct nfsd_net *nn, struct super_block *sb)
{
unsigned int idhashval;
unsigned int sc_types;
lockdep_assert_held(&nfsd_mutex);
sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
spin_lock(&nn->client_lock);
for (idhashval = 0; idhashval < CLIENT_HASH_SIZE; idhashval++) {
struct list_head *head = &nn->conf_id_hashtbl[idhashval];
struct nfs4_client *clp;
retry:
list_for_each_entry(clp, head, cl_idhash) {
struct nfs4_stid *stid;
/*
* force_expire_client() ignores cl_rpc_users once
* its wait_event() has passed, so pinning cannot
* keep an already-expiring client alive; the
* expiry path revokes its states instead.
*/
if (is_client_expired(clp))
continue;
stid = find_one_sb_stid(clp, sb, sc_types);
if (stid) {
atomic_inc(&clp->cl_rpc_users);
spin_unlock(&nn->client_lock);
revoke_one_stid(nn, clp, stid);
nfs4_put_stid(stid);
spin_lock(&nn->client_lock);
if (clp->cl_minorversion == 0)
/* Allow cleanup after a lease period.
* store_release ensures cleanup will
* see any newly revoked states if it
* sees the time updated.
*/
nn->nfs40_last_revoke =
ktime_get_boottime_seconds();
put_client_no_renew_locked(clp);
goto retry;
}
}
}
spin_unlock(&nn->client_lock);
}
static struct nfs4_stid *find_one_export_stid(struct nfs4_client *clp,
const struct path *path,
unsigned int sc_types)
{
unsigned long id = 0;
struct nfs4_stid *stid;
spin_lock(&clp->cl_lock);
while ((stid = idr_get_next_ul(&clp->cl_stateids, &id)) != NULL) {
if ((stid->sc_type & sc_types) &&
stid->sc_status == 0 &&
stid->sc_export &&
path_equal(&stid->sc_export->ex_path, path)) {
refcount_inc(&stid->sc_count);
break;
}
id++;
}
spin_unlock(&clp->cl_lock);
return stid;
}
/**
* nfsd4_revoke_export_states - revoke nfsv4 states acquired through an export
* @nn: used to identify instance of nfsd (there is one per net namespace)
* @path: export path whose states should be revoked
*
* All nfs4 states (open, lock, delegation, layout) acquired through any
* export matching @path are revoked, regardless of which client holds
* them. Matching is by path identity (dentry + vfsmount), so multiple
* svc_export objects for the same path -- one per auth_domain -- are
* handled correctly.
*
* Userspace (exportfs -u) sends this after removing the last client
* for a path, enabling the underlying filesystem to be unmounted.
*
* Context: Caller must hold nfsd_mutex with NFSD_NET_UP set. Outside
* that window nn->conf_id_hashtbl is unallocated or freed,
* so the walk would dereference a NULL or dangling pointer.
*/
void nfsd4_revoke_export_states(struct nfsd_net *nn, const struct path *path)
{
unsigned int idhashval;
unsigned int sc_types;
lockdep_assert_held(&nfsd_mutex);
sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
spin_lock(&nn->client_lock);
for (idhashval = 0; idhashval < CLIENT_HASH_SIZE; idhashval++) {
struct list_head *head = &nn->conf_id_hashtbl[idhashval];
struct nfs4_client *clp;
retry:
list_for_each_entry(clp, head, cl_idhash) {
struct nfs4_stid *stid;
/* Skip or pin clp as in nfsd4_revoke_states(). */
if (is_client_expired(clp))
continue;
stid = find_one_export_stid(clp, path, sc_types);
if (stid) {
atomic_inc(&clp->cl_rpc_users);
spin_unlock(&nn->client_lock);
revoke_one_stid(nn, clp, stid);
nfs4_put_stid(stid);
spin_lock(&nn->client_lock);
if (clp->cl_minorversion == 0)
nn->nfs40_last_revoke =
ktime_get_boottime_seconds();
put_client_no_renew_locked(clp);
goto retry;
}
}
}
spin_unlock(&nn->client_lock);
}
static inline int
hash_sessionid(struct nfs4_sessionid *sessionid)
{
struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
return sid->sequence % SESSION_HASH_SIZE;
}
#ifdef CONFIG_SUNRPC_DEBUG
static inline void
dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
{
u32 *ptr = (u32 *)(&sessionid->data[0]);
dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
}
#else
static inline void
dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
{
}
#endif
/*
* Bump the seqid on cstate->replay_owner, and clear replay_owner if it
* won't be used for replay.
*/
void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
{
struct nfs4_stateowner *so = cstate->replay_owner;
if (nfserr == nfserr_replay_me)
return;
if (!seqid_mutating_err(ntohl(nfserr))) {
nfsd4_cstate_clear_replay(cstate);
return;
}
if (!so)
return;
if (so->so_is_open_owner)
release_last_closed_stateid(openowner(so));
so->so_seqid++;
return;
}
static void
gen_sessionid(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd4_sessionid *sid;
sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
sid->clientid = clp->cl_clientid;
sid->sequence = current_sessionid++;
sid->reserved = 0;
}
/*
* The protocol defines ca_maxresponssize_cached to include the size of
* the rpc header, but all we need to cache is the data starting after
* the end of the initial SEQUENCE operation--the rest we regenerate
* each time. Therefore we can advertise a ca_maxresponssize_cached
* value that is the number of bytes in our cache plus a few additional
* bytes. In order to stay on the safe side, and not promise more than
* we can cache, those additional bytes must be the minimum possible: 24
* bytes of rpc header (xid through accept state, with AUTH_NULL
* verifier), 12 for the compound header (with zero-length tag), and 44
* for the SEQUENCE op response:
*/
#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
static struct shrinker *nfsd_slot_shrinker;
static DEFINE_SPINLOCK(nfsd_session_list_lock);
static LIST_HEAD(nfsd_session_list);
/* The sum of "target_slots" on every session, slot 0 included. */
static atomic_t nfsd_total_target_slots = ATOMIC_INIT(0);
/* Session count, subtracted from the sum to exclude slot 0. */
static atomic_t nfsd_total_sessions = ATOMIC_INIT(0);
static void
free_session_slots(struct nfsd4_session *ses, int from)
{
int i;
if (from >= ses->se_fchannel.maxreqs)
return;
for (i = from; i < ses->se_fchannel.maxreqs; i++) {
struct nfsd4_slot *slot = xa_load(&ses->se_slots, i);
/*
* Save the seqid in case we reactivate this slot.
* This will never require a memory allocation so GFP
* flag is irrelevant
*/
xa_store(&ses->se_slots, i, xa_mk_value(slot->sl_seqid), 0);
free_svc_cred(&slot->sl_cred);
kfree(slot);
}
ses->se_fchannel.maxreqs = from;
if (ses->se_target_maxslots > from) {
int delta = ses->se_target_maxslots - from;
atomic_sub(delta, &nfsd_total_target_slots);
/* Retain one slot so the session can make forward progress. */
ses->se_target_maxslots = from ?: 1;
}
}
/*
* This interface can be used by a shrinker to reduce the target max-slots
* for a session so that some slots can eventually be freed.
* It uses spin_trylock() as it may be called in a context where another
* spinlock is held that has a dependency on client_lock. As shrinkers are
* best-effort, skipping a session with the client_lock already held has no
* great cost.
*/
static int
reduce_session_slots(struct nfsd4_session *ses, int dec)
{
struct nfsd_net *nn = net_generic(ses->se_client->net,
nfsd_net_id);
int ret = 0;
if (ses->se_target_maxslots <= 1)
return ret;
if (!spin_trylock(&nn->client_lock))
return ret;
ret = min(dec, ses->se_target_maxslots-1);
ses->se_target_maxslots -= ret;
atomic_sub(ret, &nfsd_total_target_slots);
ses->se_slot_gen += 1;
if (ses->se_slot_gen == 0) {
int i;
ses->se_slot_gen = 1;
for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
struct nfsd4_slot *slot = xa_load(&ses->se_slots, i);
slot->sl_generation = 0;
}
}
spin_unlock(&nn->client_lock);
return ret;
}
static struct nfsd4_slot *nfsd4_alloc_slot(struct nfsd4_channel_attrs *fattrs,
int index, gfp_t gfp)
{
struct nfsd4_slot *slot;
size_t size;
/*
* The RPC and NFS session headers are never saved in
* the slot reply cache buffer.
*/
size = fattrs->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ ?
0 : fattrs->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
slot = kzalloc_flex(*slot, sl_data, size, gfp);
if (!slot)
return NULL;
slot->sl_index = index;
return slot;
}
static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
struct nfsd4_channel_attrs *battrs)
{
int numslots = fattrs->maxreqs;
struct nfsd4_session *new;
struct nfsd4_slot *slot;
int i;
new = kzalloc_obj(*new);
if (!new)
return NULL;
xa_init(&new->se_slots);
slot = nfsd4_alloc_slot(fattrs, 0, GFP_KERNEL);
if (!slot || xa_is_err(xa_store(&new->se_slots, 0, slot, GFP_KERNEL)))
goto out_free;
for (i = 1; i < numslots; i++) {
const gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
slot = nfsd4_alloc_slot(fattrs, i, gfp);
if (!slot)
break;
if (xa_is_err(xa_store(&new->se_slots, i, slot, gfp))) {
kfree(slot);
break;
}
}
fattrs->maxreqs = i;
memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
new->se_target_maxslots = i;
atomic_add(i, &nfsd_total_target_slots);
new->se_cb_slot_avail = ~0U;
new->se_cb_highest_slot = min(battrs->maxreqs - 1,
NFSD_BC_SLOT_TABLE_SIZE - 1);
spin_lock_init(&new->se_lock);
return new;
out_free:
kfree(slot);
xa_destroy(&new->se_slots);
kfree(new);
return NULL;
}
static void free_conn(struct nfsd4_conn *c)
{
svc_xprt_put(c->cn_xprt);
kfree(c);
}
static void nfsd4_conn_lost(struct svc_xpt_user *u)
{
struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
struct nfs4_client *clp = c->cn_session->se_client;
trace_nfsd_cb_lost(clp);
spin_lock(&clp->cl_lock);
if (!list_empty(&c->cn_persession)) {
list_del(&c->cn_persession);
free_conn(c);
}
nfsd4_probe_callback(clp);
spin_unlock(&clp->cl_lock);
}
static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
{
struct nfsd4_conn *conn;
conn = kmalloc_obj(struct nfsd4_conn);
if (!conn)
return NULL;
svc_xprt_get(rqstp->rq_xprt);
conn->cn_xprt = rqstp->rq_xprt;
conn->cn_flags = flags;
INIT_LIST_HEAD(&conn->cn_xpt_user.list);
return conn;
}
static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
{
conn->cn_session = ses;
list_add(&conn->cn_persession, &ses->se_conns);
}
static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
spin_lock(&clp->cl_lock);
__nfsd4_hash_conn(conn, ses);
spin_unlock(&clp->cl_lock);
}
static int nfsd4_register_conn(struct nfsd4_conn *conn)
{
conn->cn_xpt_user.callback = nfsd4_conn_lost;
return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
}
static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
{
int ret;
nfsd4_hash_conn(conn, ses);
ret = nfsd4_register_conn(conn);
if (ret)
/* oops; xprt is already down: */
nfsd4_conn_lost(&conn->cn_xpt_user);
/* We may have gained or lost a callback channel: */
nfsd4_probe_callback_sync(ses->se_client);
}
static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
{
u32 dir = NFS4_CDFC4_FORE;
if (cses->flags & SESSION4_BACK_CHAN)
dir |= NFS4_CDFC4_BACK;
return alloc_conn(rqstp, dir);
}
/* must be called under client_lock */
static void nfsd4_del_conns(struct nfsd4_session *s)
{
struct nfs4_client *clp = s->se_client;
struct nfsd4_conn *c;
spin_lock(&clp->cl_lock);
while (!list_empty(&s->se_conns)) {
c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
list_del_init(&c->cn_persession);
spin_unlock(&clp->cl_lock);
unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
free_conn(c);
spin_lock(&clp->cl_lock);
}
spin_unlock(&clp->cl_lock);
}
static void __free_session(struct nfsd4_session *ses)
{
free_session_slots(ses, 0);
xa_destroy(&ses->se_slots);
kfree_rcu(ses, rcu_head);
}
static void free_session(struct nfsd4_session *ses)
{
nfsd4_del_conns(ses);
__free_session(ses);
}
/**
* nfsd_slot_shrinker_count - report reclaimable DRC slots
* @s: shrinker descriptor (unused)
* @sc: shrink control (unused)
*
* Return: a positive count of reclaimable slots, or SHRINK_EMPTY when
* there is nothing to reclaim.
*/
static unsigned long
nfsd_slot_shrinker_count(struct shrinker *s, struct shrink_control *sc)
{
int count;
/*
* To prevent session deadlock, one slot of each session (slot 0)
* is not reclaimable while the session is active. Thus the number
* of sessions is subtracted from the total number of target slots.
*/
count = atomic_read(&nfsd_total_target_slots) -
atomic_read(&nfsd_total_sessions);
return count > 0 ? count : SHRINK_EMPTY;
}
/**
* nfsd_slot_shrinker_scan - reclaim DRC slots under memory pressure
* @s: shrinker descriptor (unused)
* @sc: shrink control; @sc->nr_to_scan bounds the sessions visited,
* @sc->nr_scanned reports how many were visited
*
* Return: the number of session slots NFSD will release.
*/
static unsigned long
nfsd_slot_shrinker_scan(struct shrinker *s, struct shrink_control *sc)
{
struct nfsd4_session *ses;
unsigned long scanned = 0;
unsigned long freed = 0;
/*
* Each visited session releases at most one slot. After
* nr_to_scan sessions have been visited, the list head is
* rotated past the last visited session so the next scan
* resumes from there.
*/
spin_lock(&nfsd_session_list_lock);
list_for_each_entry(ses, &nfsd_session_list, se_all_sessions) {
freed += reduce_session_slots(ses, 1);
scanned += 1;
if (scanned >= sc->nr_to_scan) {
/* Move starting point for next scan */
list_move(&nfsd_session_list, &ses->se_all_sessions);
break;
}
}
spin_unlock(&nfsd_session_list_lock);
sc->nr_scanned = scanned;
return freed;
}
static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
{
int idx;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
new->se_client = clp;
gen_sessionid(new);
INIT_LIST_HEAD(&new->se_conns);
atomic_set(&new->se_ref, 0);
new->se_dead = false;
new->se_cb_prog = cses->callback_prog;
new->se_cb_sec = cses->cb_sec;
for (idx = 0; idx < NFSD_BC_SLOT_TABLE_SIZE; ++idx)
new->se_cb_seq_nr[idx] = 1;
idx = hash_sessionid(&new->se_sessionid);
list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
spin_lock(&clp->cl_lock);
list_add(&new->se_perclnt, &clp->cl_sessions);
spin_unlock(&clp->cl_lock);
spin_lock(&nfsd_session_list_lock);
list_add_tail(&new->se_all_sessions, &nfsd_session_list);
atomic_inc(&nfsd_total_sessions);
spin_unlock(&nfsd_session_list_lock);
{
struct sockaddr *sa = svc_addr(rqstp);
/*
* This is a little silly; with sessions there's no real
* use for the callback address. Use the peer address
* as a reasonable default for now, but consider fixing
* the rpc client not to require an address in the
* future:
*/
rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
}
}
/* caller must hold client_lock */
static struct nfsd4_session *
__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
{
struct nfsd4_session *elem;
int idx;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
dump_sessionid(__func__, sessionid);
idx = hash_sessionid(sessionid);
/* Search in the appropriate list */
list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
if (!memcmp(elem->se_sessionid.data, sessionid->data,
NFS4_MAX_SESSIONID_LEN)) {
return elem;
}
}
dprintk("%s: session not found\n", __func__);
return NULL;
}
static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
__be32 *ret)
{
struct nfsd4_session *session;
__be32 status = nfserr_badsession;
session = __find_in_sessionid_hashtbl(sessionid, net);
if (!session)
goto out;
status = nfsd4_get_session_locked(session);
if (status)
session = NULL;
out:
*ret = status;
return session;
}
/* caller must hold client_lock */
static void
unhash_session(struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
list_del(&ses->se_hash);
spin_lock(&ses->se_client->cl_lock);
list_del(&ses->se_perclnt);
spin_unlock(&ses->se_client->cl_lock);
spin_lock(&nfsd_session_list_lock);
list_del(&ses->se_all_sessions);
atomic_dec(&nfsd_total_sessions);
spin_unlock(&nfsd_session_list_lock);
}
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
static int
STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
{
/*
* We're assuming the clid was not given out from a boot
* precisely 2^32 (about 136 years) before this one. That seems
* a safe assumption:
*/
if (clid->cl_boot == (u32)nn->boot_time)
return 0;
trace_nfsd_clid_stale(clid);
return 1;
}
static struct nfs4_client *alloc_client(struct xdr_netobj name,
struct nfsd_net *nn)
{
struct nfs4_client *clp;
int i;
if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients &&
atomic_read(&nn->nfsd_courtesy_clients) > 0)
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
if (clp == NULL)
return NULL;
xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
if (clp->cl_name.data == NULL)
goto err_no_name;
clp->cl_ownerstr_hashtbl = kmalloc_objs(struct list_head,
OWNER_HASH_SIZE);
if (!clp->cl_ownerstr_hashtbl)
goto err_no_hashtbl;
clp->cl_callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
if (!clp->cl_callback_wq)
goto err_no_callback_wq;
for (i = 0; i < OWNER_HASH_SIZE; i++)
INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
INIT_LIST_HEAD(&clp->cl_sessions);
idr_init(&clp->cl_stateids);
atomic_set(&clp->cl_rpc_users, 0);
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
clp->cl_state = NFSD4_ACTIVE;
atomic_inc(&nn->nfs4_client_count);
atomic_set(&clp->cl_delegs_in_recall, 0);
INIT_LIST_HEAD(&clp->cl_idhash);
INIT_LIST_HEAD(&clp->cl_openowners);
INIT_LIST_HEAD(&clp->cl_delegations);
INIT_LIST_HEAD(&clp->cl_lru);
INIT_LIST_HEAD(&clp->cl_revoked);
#ifdef CONFIG_NFSD_PNFS
INIT_LIST_HEAD(&clp->cl_lo_states);
#endif
#ifdef CONFIG_NFSD_SCSILAYOUT
xa_init(&clp->cl_dev_fences);
mutex_init(&clp->cl_fence_mutex);
#endif
INIT_LIST_HEAD(&clp->async_copies);
spin_lock_init(&clp->async_lock);
spin_lock_init(&clp->cl_lock);
rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
return clp;
err_no_callback_wq:
kfree(clp->cl_ownerstr_hashtbl);
err_no_hashtbl:
kfree(clp->cl_name.data);
err_no_name:
kmem_cache_free(client_slab, clp);
return NULL;
}
static void __free_client(struct kref *k)
{
struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
free_svc_cred(&clp->cl_cred);
destroy_workqueue(clp->cl_callback_wq);
kfree(clp->cl_ownerstr_hashtbl);
kfree(clp->cl_name.data);
kfree(clp->cl_nii_domain.data);
kfree(clp->cl_nii_name.data);
idr_destroy(&clp->cl_stateids);
kfree(clp->cl_ra);
kmem_cache_free(client_slab, clp);
}
/**
* nfsd4_put_client - release a reference on an nfs4_client
* @clp: the client to be released
*
* When the last reference is released, the client is freed.
*/
void nfsd4_put_client(struct nfs4_client *clp)
{
kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
}
static void
free_client(struct nfs4_client *clp)
{
while (!list_empty(&clp->cl_sessions)) {
struct nfsd4_session *ses;
ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
se_perclnt);
list_del(&ses->se_perclnt);
WARN_ON_ONCE(atomic_read(&ses->se_ref));
free_session(ses);
}
rpc_destroy_wait_queue(&clp->cl_cb_waitq);
if (clp->cl_nfsd_dentry) {
nfsd_client_rmdir(clp->cl_nfsd_dentry);
clp->cl_nfsd_dentry = NULL;
wake_up_all(&expiry_wq);
}
nfsd4_put_client(clp);
}
/* must be called under the client_lock */
static void
unhash_client_locked(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfsd4_session *ses;
lockdep_assert_held(&nn->client_lock);
/* Mark the client as expired! */
clp->cl_time = 0;
/* Make it invisible */
if (!list_empty(&clp->cl_idhash)) {
list_del_init(&clp->cl_idhash);
if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
else
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
}
list_del_init(&clp->cl_lru);
spin_lock(&clp->cl_lock);
spin_lock(&nfsd_session_list_lock);
list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) {
list_del_init(&ses->se_hash);
/*
* unhash_client_locked() can run more than once for a
* client; the session stays on cl_sessions across calls.
* The first pass empties se_all_sessions via
* list_del_init(), so skip the decrement on later passes
* to keep nfsd_total_sessions from being double-counted.
*/
if (!list_empty(&ses->se_all_sessions)) {
list_del_init(&ses->se_all_sessions);
atomic_dec(&nfsd_total_sessions);
}
}
spin_unlock(&nfsd_session_list_lock);
spin_unlock(&clp->cl_lock);
}
static void
unhash_client(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
spin_lock(&nn->client_lock);
unhash_client_locked(clp);
spin_unlock(&nn->client_lock);
}
static __be32 mark_client_expired_locked(struct nfs4_client *clp)
{
int users = atomic_read(&clp->cl_rpc_users);
trace_nfsd_mark_client_expired(clp, users);
if (users)
return nfserr_jukebox;
unhash_client_locked(clp);
return nfs_ok;
}
static void
__destroy_client(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
int i;
struct nfs4_openowner *oo;
struct nfs4_delegation *dp;
LIST_HEAD(reaplist);
spin_lock(&nn->deleg_lock);
while (!list_empty(&clp->cl_delegations)) {
dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
unhash_delegation_locked(dp, SC_STATUS_CLOSED);
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&nn->deleg_lock);
while (!list_empty(&reaplist)) {
dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
destroy_unhashed_deleg(dp);
}
while (!list_empty(&clp->cl_revoked)) {
dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
nfs4_put_stid(&dp->dl_stid);
}
while (!list_empty(&clp->cl_openowners)) {
oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
nfs4_get_stateowner(&oo->oo_owner);
release_openowner(oo);
}
for (i = 0; i < OWNER_HASH_SIZE; i++) {
struct nfs4_stateowner *so;
spin_lock(&clp->cl_lock);
while (!list_empty(&clp->cl_ownerstr_hashtbl[i])) {
so = list_first_entry(&clp->cl_ownerstr_hashtbl[i],
struct nfs4_stateowner, so_strhash);
/* Should be no openowners at this point */
WARN_ON_ONCE(so->so_is_open_owner);
nfs4_get_stateowner(so);
unhash_lockowner_locked(lockowner(so));
spin_unlock(&clp->cl_lock);
remove_blocked_locks(lockowner(so));
nfs4_put_stateowner(so);
spin_lock(&clp->cl_lock);
}
spin_unlock(&clp->cl_lock);
}
nfsd4_return_all_client_layouts(clp);
nfsd4_shutdown_copy(clp);
nfsd4_shutdown_callback(clp);
if (clp->cl_cb_conn.cb_xprt)
svc_xprt_put(clp->cl_cb_conn.cb_xprt);
atomic_add_unless(&nn->nfs4_client_count, -1, 0);
nfsd4_dec_courtesy_client_count(nn, clp);
#ifdef CONFIG_NFSD_SCSILAYOUT
xa_destroy(&clp->cl_dev_fences);
#endif
free_client(clp);
wake_up_all(&expiry_wq);
}
static void
destroy_client(struct nfs4_client *clp)
{
unhash_client(clp);
__destroy_client(clp);
}
static void inc_reclaim_complete(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
if (!test_bit(NFSD_NET_TRACK_RECLAIM_COMPLETES, &nn->flags))
return;
down_read(&nn->reclaim_str_hashtbl_lock);
if (!nfsd4_find_reclaim_client(clp->cl_name, nn)) {
up_read(&nn->reclaim_str_hashtbl_lock);
return;
}
if (atomic_inc_return(&nn->nr_reclaim_complete) ==
nn->reclaim_str_hashtbl_size) {
up_read(&nn->reclaim_str_hashtbl_lock);
printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
clp->net->ns.inum);
nfsd4_end_grace(nn);
return;
}
up_read(&nn->reclaim_str_hashtbl_lock);
}
static void expire_client(struct nfs4_client *clp)
{
unhash_client(clp);
nfsd4_client_record_remove(clp);
__destroy_client(clp);
}
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
{
memcpy(target->cl_verifier.data, source->data,
sizeof(target->cl_verifier.data));
}
static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
{
target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
target->cl_clientid.cl_id = source->cl_clientid.cl_id;
}
static int copy_cred(struct svc_cred *target, struct svc_cred *source)
{
target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
target->cr_raw_principal = kstrdup(source->cr_raw_principal,
GFP_KERNEL);
target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
if ((source->cr_principal && !target->cr_principal) ||
(source->cr_raw_principal && !target->cr_raw_principal) ||
(source->cr_targ_princ && !target->cr_targ_princ))
return -ENOMEM;
target->cr_flavor = source->cr_flavor;
target->cr_uid = source->cr_uid;
target->cr_gid = source->cr_gid;
target->cr_group_info = source->cr_group_info;
get_group_info(target->cr_group_info);
target->cr_gss_mech = source->cr_gss_mech;
if (source->cr_gss_mech)
gss_mech_get(source->cr_gss_mech);
return 0;
}
static int
compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
{
if (o1->len < o2->len)
return -1;
if (o1->len > o2->len)
return 1;
return memcmp(o1->data, o2->data, o1->len);
}
static int
same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
{
return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
}
static int
same_clid(clientid_t *cl1, clientid_t *cl2)
{
return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
}
static bool groups_equal(struct group_info *g1, struct group_info *g2)
{
int i;
if (g1->ngroups != g2->ngroups)
return false;
for (i=0; i<g1->ngroups; i++)
if (!gid_eq(g1->gid[i], g2->gid[i]))
return false;
return true;
}
/*
* RFC 3530 language requires clid_inuse be returned when the
* "principal" associated with a requests differs from that previously
* used. We use uid, gid's, and gss principal string as our best
* approximation. We also don't want to allow non-gss use of a client
* established using gss: in theory cr_principal should catch that
* change, but in practice cr_principal can be null even in the gss case
* since gssd doesn't always pass down a principal string.
*/
static bool is_gss_cred(struct svc_cred *cr)
{
/* Is cr_flavor one of the gss "pseudoflavors"?: */
return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
}
static bool
same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
{
if ((is_gss_cred(cr1) != is_gss_cred(cr2))
|| (!uid_eq(cr1->cr_uid, cr2->cr_uid))
|| (!gid_eq(cr1->cr_gid, cr2->cr_gid))
|| !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
return false;
/* XXX: check that cr_targ_princ fields match ? */
if (cr1->cr_principal == cr2->cr_principal)
return true;
if (!cr1->cr_principal || !cr2->cr_principal)
return false;
return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
}
static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
{
struct svc_cred *cr = &rqstp->rq_cred;
u32 service;
if (!cr->cr_gss_mech)
return false;
service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
return service == RPC_GSS_SVC_INTEGRITY ||
service == RPC_GSS_SVC_PRIVACY;
}
bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
{
struct svc_cred *cr = &rqstp->rq_cred;
if (!cl->cl_mach_cred)
return true;
if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
return false;
if (!svc_rqst_integrity_protected(rqstp))
return false;
if (cl->cl_cred.cr_raw_principal)
return 0 == strcmp(cl->cl_cred.cr_raw_principal,
cr->cr_raw_principal);
if (!cr->cr_principal)
return false;
return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
}
static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
{
__be32 verf[2];
/*
* This is opaque to client, so no need to byte-swap. Use
* __force to keep sparse happy
*/
verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
verf[1] = (__force __be32)nn->clverifier_counter++;
memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
}
static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
{
clp->cl_clientid.cl_boot = (u32)nn->boot_time;
clp->cl_clientid.cl_id = nn->clientid_counter++;
gen_confirm(clp, nn);
}
static struct nfs4_stid *
find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
{
struct nfs4_stid *ret;
ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
if (!ret || !ret->sc_type)
return NULL;
/*
* Copy offload stateids live in cl_stateids only for id allocation and
* refcounting; per RFC 7862 they are not valid targets for generic
* stateid ops (FREE_STATEID, TEST_STATEID, I/O). Hide them so those
* paths return NFS4ERR_BAD_STATEID.
*/
if (ret->sc_type == SC_TYPE_COPY)
return NULL;
return ret;
}
static struct nfs4_stid *
find_stateid_by_type(struct nfs4_client *cl, stateid_t *t,
unsigned short typemask, unsigned short ok_states)
{
struct nfs4_stid *s;
spin_lock(&cl->cl_lock);
s = find_stateid_locked(cl, t);
if (s != NULL) {
if ((s->sc_status & ~ok_states) == 0 &&
(typemask & s->sc_type))
refcount_inc(&s->sc_count);
else
s = NULL;
}
spin_unlock(&cl->cl_lock);
return s;
}
static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
{
struct nfsdfs_client *nc;
nc = get_nfsdfs_client(inode);
if (!nc)
return NULL;
return container_of(nc, struct nfs4_client, cl_nfsdfs);
}
static void seq_quote_mem(struct seq_file *m, char *data, int len)
{
seq_puts(m, "\"");
seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
seq_puts(m, "\"");
}
static const char *cb_state2str(int state)
{
switch (state) {
case NFSD4_CB_UP:
return "UP";
case NFSD4_CB_UNKNOWN:
return "UNKNOWN";
case NFSD4_CB_DOWN:
return "DOWN";
case NFSD4_CB_FAULT:
return "FAULT";
}
return "UNDEFINED";
}
static int client_info_show(struct seq_file *m, void *v)
{
struct inode *inode = file_inode(m->file);
struct nfsd4_session *ses;
struct nfs4_client *clp;
u64 clid;
clp = get_nfsdfs_clp(inode);
if (!clp)
return -ENXIO;
memcpy(&clid, &clp->cl_clientid, sizeof(clid));
seq_printf(m, "clientid: 0x%llx\n", clid);
seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
if (clp->cl_state == NFSD4_COURTESY)
seq_puts(m, "status: courtesy\n");
else if (clp->cl_state == NFSD4_EXPIRABLE)
seq_puts(m, "status: expirable\n");
else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
seq_puts(m, "status: confirmed\n");
else
seq_puts(m, "status: unconfirmed\n");
seq_printf(m, "seconds from last renew: %lld\n",
ktime_get_boottime_seconds() - clp->cl_time);
seq_puts(m, "name: ");
seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
if (clp->cl_nii_domain.data) {
seq_puts(m, "Implementation domain: ");
seq_quote_mem(m, clp->cl_nii_domain.data,
clp->cl_nii_domain.len);
seq_puts(m, "\nImplementation name: ");
seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
}
seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
seq_printf(m, "callback address: \"%pISpc\"\n", &clp->cl_cb_conn.cb_addr);
seq_printf(m, "admin-revoked states: %d\n",
atomic_read(&clp->cl_admin_revoked));
spin_lock(&clp->cl_lock);
seq_printf(m, "session slots:");
list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
seq_printf(m, " %u", ses->se_fchannel.maxreqs);
seq_printf(m, "\nsession target slots:");
list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
seq_printf(m, " %u", ses->se_target_maxslots);
spin_unlock(&clp->cl_lock);
seq_puts(m, "\n");
nfsd4_put_client(clp);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(client_info);
static void *states_start(struct seq_file *s, loff_t *pos)
__acquires(&clp->cl_lock)
{
struct nfs4_client *clp = s->private;
unsigned long id = *pos;
void *ret;
spin_lock(&clp->cl_lock);
ret = idr_get_next_ul(&clp->cl_stateids, &id);
*pos = id;
return ret;
}
static void *states_next(struct seq_file *s, void *v, loff_t *pos)
{
struct nfs4_client *clp = s->private;
unsigned long id = *pos;
void *ret;
id = *pos;
id++;
ret = idr_get_next_ul(&clp->cl_stateids, &id);
*pos = id;
return ret;
}
static void states_stop(struct seq_file *s, void *v)
__releases(&clp->cl_lock)
{
struct nfs4_client *clp = s->private;
spin_unlock(&clp->cl_lock);
}
static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
{
seq_printf(s, "filename: \"%pD2\"", f->nf_file);
}
static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
{
struct inode *inode = file_inode(f->nf_file);
seq_printf(s, "superblock: \"%02x:%02x:%llu\"",
MAJOR(inode->i_sb->s_dev),
MINOR(inode->i_sb->s_dev),
inode->i_ino);
}
static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
{
seq_puts(s, "owner: ");
seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
}
static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
{
seq_printf(s, "0x%.8x", stid->si_generation);
seq_printf(s, "%12phN", &stid->si_opaque);
}
static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_ol_stateid *ols;
struct nfs4_file *nf;
struct nfsd_file *file;
struct nfs4_stateowner *oo;
unsigned int access, deny;
ols = openlockstateid(st);
oo = ols->st_stateowner;
nf = st->sc_file;
seq_puts(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_puts(s, ": { type: open, ");
access = bmap_to_share_mode(ols->st_access_bmap);
deny = bmap_to_share_mode(ols->st_deny_bmap);
seq_printf(s, "access: %s%s, ",
access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
seq_printf(s, "deny: %s%s, ",
deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
if (nf) {
spin_lock(&nf->fi_lock);
file = find_any_file_locked(nf);
if (file) {
nfs4_show_superblock(s, file);
seq_puts(s, ", ");
nfs4_show_fname(s, file);
seq_puts(s, ", ");
}
spin_unlock(&nf->fi_lock);
} else
seq_puts(s, "closed, ");
nfs4_show_owner(s, oo);
if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
seq_puts(s, ", admin-revoked");
seq_puts(s, " }\n");
return 0;
}
static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_ol_stateid *ols;
struct nfs4_file *nf;
struct nfsd_file *file;
struct nfs4_stateowner *oo;
ols = openlockstateid(st);
oo = ols->st_stateowner;
nf = st->sc_file;
seq_puts(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_puts(s, ": { type: lock, ");
spin_lock(&nf->fi_lock);
file = find_any_file_locked(nf);
if (file) {
/*
* Note: a lock stateid isn't really the same thing as a lock,
* it's the locking state held by one owner on a file, and there
* may be multiple (or no) lock ranges associated with it.
* (Same for the matter is true of open stateids.)
*/
nfs4_show_superblock(s, file);
/* XXX: open stateid? */
seq_puts(s, ", ");
nfs4_show_fname(s, file);
seq_puts(s, ", ");
}
nfs4_show_owner(s, oo);
if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
seq_puts(s, ", admin-revoked");
seq_puts(s, " }\n");
spin_unlock(&nf->fi_lock);
return 0;
}
static char *nfs4_show_deleg_type(u32 dl_type)
{
switch (dl_type) {
case OPEN_DELEGATE_READ:
return "r";
case OPEN_DELEGATE_WRITE:
return "w";
case OPEN_DELEGATE_READ_ATTRS_DELEG:
return "ra";
case OPEN_DELEGATE_WRITE_ATTRS_DELEG:
return "wa";
}
return "?";
}
static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_delegation *ds;
struct nfs4_file *nf;
struct nfsd_file *file;
ds = delegstateid(st);
nf = st->sc_file;
seq_puts(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_puts(s, ": { type: deleg, ");
seq_printf(s, "access: %s", nfs4_show_deleg_type(ds->dl_type));
/* XXX: lease time, whether it's being recalled. */
spin_lock(&nf->fi_lock);
file = rcu_dereference_protected(nf->fi_deleg_file,
lockdep_is_held(&nf->fi_lock));
if (file) {
seq_puts(s, ", ");
nfs4_show_superblock(s, file);
seq_puts(s, ", ");
nfs4_show_fname(s, file);
}
spin_unlock(&nf->fi_lock);
if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
seq_puts(s, ", admin-revoked");
seq_puts(s, " }\n");
return 0;
}
static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
{
struct nfs4_layout_stateid *ls;
struct nfsd_file *file;
ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
seq_puts(s, "- ");
nfs4_show_stateid(s, &st->sc_stateid);
seq_puts(s, ": { type: layout");
/* XXX: What else would be useful? */
spin_lock(&ls->ls_stid.sc_file->fi_lock);
file = ls->ls_file;
if (file) {
seq_puts(s, ", ");
nfs4_show_superblock(s, file);
seq_puts(s, ", ");
nfs4_show_fname(s, file);
}
spin_unlock(&ls->ls_stid.sc_file->fi_lock);
if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
seq_puts(s, ", admin-revoked");
seq_puts(s, " }\n");
return 0;
}
static int states_show(struct seq_file *s, void *v)
{
struct nfs4_stid *st = v;
switch (st->sc_type) {
case SC_TYPE_OPEN:
return nfs4_show_open(s, st);
case SC_TYPE_LOCK:
return nfs4_show_lock(s, st);
case SC_TYPE_DELEG:
return nfs4_show_deleg(s, st);
case SC_TYPE_LAYOUT:
return nfs4_show_layout(s, st);
default:
return 0; /* XXX: or SEQ_SKIP? */
}
/* XXX: copy stateids? */
}
static struct seq_operations states_seq_ops = {
.start = states_start,
.next = states_next,
.stop = states_stop,
.show = states_show
};
static int client_states_open(struct inode *inode, struct file *file)
{
struct seq_file *s;
struct nfs4_client *clp;
int ret;
clp = get_nfsdfs_clp(inode);
if (!clp)
return -ENXIO;
ret = seq_open(file, &states_seq_ops);
if (ret) {
nfsd4_put_client(clp);
return ret;
}
s = file->private_data;
s->private = clp;
return 0;
}
static int client_opens_release(struct inode *inode, struct file *file)
{
struct seq_file *m = file->private_data;
struct nfs4_client *clp = m->private;
/* XXX: alternatively, we could get/drop in seq start/stop */
nfsd4_put_client(clp);
return seq_release(inode, file);
}
static const struct file_operations client_states_fops = {
.open = client_states_open,
.read = seq_read,
.llseek = seq_lseek,
.release = client_opens_release,
};
/*
* Normally we refuse to destroy clients that are in use, but here the
* administrator is telling us to just do it. We also want to wait
* so the caller has a guarantee that the client's locks are gone by
* the time the write returns:
*/
static void force_expire_client(struct nfs4_client *clp)
{
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
bool already_expired;
trace_nfsd_clid_admin_expired(&clp->cl_clientid);
/*
* cl_time is cleared under client_lock before the wait so a
* revocation walk pinning cl_rpc_users under it either skips
* this client or is seen by this wait_event().
*/
spin_lock(&nn->client_lock);
clp->cl_time = 0;
spin_unlock(&nn->client_lock);
wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
spin_lock(&nn->client_lock);
already_expired = list_empty(&clp->cl_lru);
if (!already_expired)
unhash_client_locked(clp);
spin_unlock(&nn->client_lock);
if (!already_expired)
expire_client(clp);
else
wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
}
static ssize_t client_ctl_write(struct file *file, const char __user *buf,
size_t size, loff_t *pos)
{
char *data;
struct nfs4_client *clp;
data = simple_transaction_get(file, buf, size);
if (IS_ERR(data))
return PTR_ERR(data);
if (size != 7 || 0 != memcmp(data, "expire\n", 7))
return -EINVAL;
clp = get_nfsdfs_clp(file_inode(file));
if (!clp)
return -ENXIO;
force_expire_client(clp);
nfsd4_put_client(clp);
return 7;
}
static const struct file_operations client_ctl_fops = {
.write = client_ctl_write,
.release = simple_transaction_release,
};
static const struct tree_descr client_files[] = {
[0] = {"info", &client_info_fops, S_IRUSR},
[1] = {"states", &client_states_fops, S_IRUSR},
[2] = {"ctl", &client_ctl_fops, S_IWUSR},
[3] = {""},
};
static int
nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
struct rpc_task *task)
{
trace_nfsd_cb_recall_any_done(cb, task);
switch (task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
default:
return 1;
}
}
static void
nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
{
struct nfs4_client *clp = cb->cb_clp;
nfsd4_put_client(clp);
}
static int
nfsd4_cb_getattr_done(struct nfsd4_callback *cb, struct rpc_task *task)
{
struct nfs4_cb_fattr *ncf =
container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
struct nfs4_delegation *dp =
container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
trace_nfsd_cb_getattr_done(&dp->dl_stid.sc_stateid, task);
ncf->ncf_cb_status = task->tk_status;
switch (task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
default:
return 1;
}
}
static void
nfsd4_cb_getattr_release(struct nfsd4_callback *cb)
{
struct nfs4_cb_fattr *ncf =
container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
struct nfs4_delegation *dp =
container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
nfs4_put_stid(&dp->dl_stid);
}
static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
{
bool queued;
if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &dp->dl_recall.cb_flags))
return;
/*
* When called from the lease break (nfsd_break_deleg_cb()) the state
* code is serialized by the flc_lock and the lease has not been
* removed yet, so sc_count is known to be nonzero. The CB_NOTIFY
* callback paths reach here from a workqueue without the flc_lock,
* where the delegation may already be unhashed with sc_count at zero.
* Use refcount_inc_not_zero() so both cases are safe, and bail if the
* delegation is already being torn down.
*/
if (!refcount_inc_not_zero(&dp->dl_stid.sc_count)) {
clear_bit(NFSD4_CALLBACK_RUNNING, &dp->dl_recall.cb_flags);
return;
}
queued = nfsd4_run_cb(&dp->dl_recall);
WARN_ON_ONCE(!queued);
if (!queued) {
refcount_dec(&dp->dl_stid.sc_count);
clear_bit(NFSD4_CALLBACK_RUNNING, &dp->dl_recall.cb_flags);
}
}
static bool
nfsd4_cb_notify_prepare(struct nfsd4_callback *cb)
{
struct nfsd4_cb_notify *ncn = container_of(cb, struct nfsd4_cb_notify, ncn_cb);
struct nfs4_delegation *dp = container_of(ncn, struct nfs4_delegation, dl_cb_notify);
struct nfsd_notify_event *events[NOTIFY4_EVENT_QUEUE_SIZE];
struct xdr_buf xdr = { .buflen = PAGE_SIZE * NOTIFY4_PAGE_ARRAY_SIZE,
.pages = ncn->ncn_pages };
int limit = NOTIFY4_EVENT_QUEUE_SIZE;
struct xdr_stream stream;
struct nfsd_file *nf;
bool error = false;
int count, i;
/* Save a slot for dir attr update if requested */
if (dp->dl_notify_mask & BIT(NOTIFY4_CHANGE_DIR_ATTRS))
--limit;
/* Clear any failure recorded by a previous transmit. */
ncn->ncn_encode_err = false;
xdr_init_encode_pages(&stream, &xdr);
spin_lock(&ncn->ncn_lock);
count = ncn->ncn_evt_cnt;
/* spurious queueing? */
if (count == 0) {
spin_unlock(&ncn->ncn_lock);
return false;
}
memcpy(events, ncn->ncn_evt, sizeof(*events) * count);
ncn->ncn_evt_cnt = 0;
spin_unlock(&ncn->ncn_lock);
/*
* We can't keep up! Drop the queued events and recall. The queue must
* be drained here: out_recall leaves ncn_evt_cnt at 0, so the release
* op won't see leftover events and requeue this callback forever.
*/
if (count > limit) {
for (i = 0; i < count; ++i)
nfsd_notify_event_put(events[i]);
goto out_recall;
}
rcu_read_lock();
nf = nfsd_file_get(rcu_dereference(dp->dl_stid.sc_file->fi_deleg_file));
rcu_read_unlock();
if (!nf) {
for (i = 0; i < count; ++i)
nfsd_notify_event_put(events[i]);
goto out_recall;
}
for (i = 0; i < count; ++i) {
struct nfsd_notify_event *nne = events[i];
if (!error) {
u32 *maskp = (u32 *)xdr_reserve_space(&stream, sizeof(*maskp));
u8 *p;
if (!maskp) {
error = true;
goto put_event;
}
p = nfsd4_encode_notify_event(&stream, nne, dp, nf, maskp);
if (!p) {
pr_notice("Could not generate CB_NOTIFY from fsnotify mask 0x%x\n",
nne->ne_mask);
error = true;
goto put_event;
}
ncn->ncn_nf[i].notify_mask.count = 1;
ncn->ncn_nf[i].notify_mask.element = maskp;
ncn->ncn_nf[i].notify_vals.data = p;
ncn->ncn_nf[i].notify_vals.len = (u8 *)stream.p - p;
}
put_event:
nfsd_notify_event_put(nne);
}
if (!error && (dp->dl_notify_mask & BIT(NOTIFY4_CHANGE_DIR_ATTRS))) {
u32 *maskp = (u32 *)xdr_reserve_space(&stream, sizeof(*maskp));
u8 *p;
if (maskp)
p = nfsd4_encode_dir_attr_change(&stream, dp, nf);
else
p = ERR_PTR(-ENOBUFS);
if (IS_ERR(p)) {
/*
* The client asked to be told about dir attr changes
* but the change could not be encoded. RFC 8881
* s10.9.4 requires the server to recall the delegation
* rather than drop a requested notification, so fall
* through to recall. A NULL return instead means there
* were no attributes to report, so omit the event in
* that case.
*/
error = true;
} else if (p) {
*maskp = BIT(NOTIFY4_CHANGE_DIR_ATTRS);
ncn->ncn_nf[count].notify_mask.count = 1;
ncn->ncn_nf[count].notify_mask.element = maskp;
ncn->ncn_nf[count].notify_vals.data = p;
ncn->ncn_nf[count].notify_vals.len = (u8 *)stream.p - p;
++count;
}
}
if (!error) {
ncn->ncn_nf_cnt = count;
nfsd_file_put(nf);
return true;
}
nfsd_file_put(nf);
out_recall:
nfsd_break_one_deleg(dp);
return false;
}
static int
nfsd4_cb_notify_done(struct nfsd4_callback *cb,
struct rpc_task *task)
{
struct nfsd4_cb_notify *ncn = container_of(cb, struct nfsd4_cb_notify, ncn_cb);
struct nfs4_delegation *dp = container_of(ncn, struct nfs4_delegation, dl_cb_notify);
if (dp->dl_stid.sc_status)
return 1;
/*
* The CB_NOTIFY op overflowed the send buffer and was dropped from the
* compound. The notification is lost, so recall the delegation rather
* than leaving the client unaware of the directory change.
*/
if (ncn->ncn_encode_err) {
nfsd_break_one_deleg(dp);
return 1;
}
switch (task->tk_status) {
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
default:
/* For any other hard error, recall the deleg */
nfsd_break_one_deleg(dp);
fallthrough;
case 0:
return 1;
}
}
static void nfsd4_run_cb_notify(struct nfsd4_cb_notify *ncn);
static void
nfsd4_cb_notify_release(struct nfsd4_callback *cb)
{
struct nfsd4_cb_notify *ncn =
container_of(cb, struct nfsd4_cb_notify, ncn_cb);
struct nfs4_delegation *dp =
container_of(ncn, struct nfs4_delegation, dl_cb_notify);
/*
* Drain events that arrived while this callback was in flight, but
* don't requeue against a revoked delegation: there's no point in
* notifying a client that no longer holds it, and doing so can pin the
* stid and spin the workqueue.
*/
if (!dp->dl_stid.sc_status && READ_ONCE(ncn->ncn_evt_cnt) > 0)
nfsd4_run_cb_notify(ncn);
nfs4_put_stid(&dp->dl_stid);
}
static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
.done = nfsd4_cb_recall_any_done,
.release = nfsd4_cb_recall_any_release,
.opcode = OP_CB_RECALL_ANY,
};
static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops = {
.done = nfsd4_cb_getattr_done,
.release = nfsd4_cb_getattr_release,
.opcode = OP_CB_GETATTR,
};
static const struct nfsd4_callback_ops nfsd4_cb_notify_ops = {
.prepare = nfsd4_cb_notify_prepare,
.done = nfsd4_cb_notify_done,
.release = nfsd4_cb_notify_release,
.opcode = OP_CB_NOTIFY,
};
static void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf)
{
struct nfs4_delegation *dp =
container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &ncf->ncf_getattr.cb_flags))
return;
/* set to proper status when nfsd4_cb_getattr_done runs */
ncf->ncf_cb_status = NFS4ERR_IO;
/* ensure that wake_bit is done when RUNNING is cleared */
set_bit(NFSD4_CALLBACK_WAKE, &ncf->ncf_getattr.cb_flags);
refcount_inc(&dp->dl_stid.sc_count);
nfsd4_run_cb(&ncf->ncf_getattr);
}
static struct nfs4_client *create_client(struct xdr_netobj name,
struct svc_rqst *rqstp, nfs4_verifier *verf)
{
struct nfs4_client *clp;
struct sockaddr *sa = svc_addr(rqstp);
int ret;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct dentry *dentries[ARRAY_SIZE(client_files)];
clp = alloc_client(name, nn);
if (clp == NULL)
return NULL;
ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
if (ret) {
free_client(clp);
return NULL;
}
gen_clid(clp, nn);
kref_init(&clp->cl_nfsdfs.cl_ref);
nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
clp->cl_time = ktime_get_boottime_seconds();
copy_verf(clp, verf);
memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
RCU_INIT_POINTER(clp->cl_cb_session, NULL);
clp->net = net;
clp->cl_nfsd_dentry = nfsd_client_mkdir(
nn, &clp->cl_nfsdfs,
clp->cl_clientid.cl_id - nn->clientid_base,
client_files, dentries);
clp->cl_nfsd_info_dentry = dentries[0];
if (!clp->cl_nfsd_dentry) {
free_client(clp);
return NULL;
}
clp->cl_ra = kzalloc_obj(*clp->cl_ra);
if (!clp->cl_ra) {
free_client(clp);
return NULL;
}
clp->cl_ra_time = 0;
nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops,
NFSPROC4_CLNT_CB_RECALL_ANY);
return clp;
}
static void
add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
{
struct rb_node **new = &(root->rb_node), *parent = NULL;
struct nfs4_client *clp;
while (*new) {
clp = rb_entry(*new, struct nfs4_client, cl_namenode);
parent = *new;
if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
new = &((*new)->rb_left);
else
new = &((*new)->rb_right);
}
rb_link_node(&new_clp->cl_namenode, parent, new);
rb_insert_color(&new_clp->cl_namenode, root);
}
static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
{
int cmp;
struct rb_node *node = root->rb_node;
struct nfs4_client *clp;
while (node) {
clp = rb_entry(node, struct nfs4_client, cl_namenode);
cmp = compare_blob(&clp->cl_name, name);
if (cmp > 0)
node = node->rb_left;
else if (cmp < 0)
node = node->rb_right;
else
return clp;
}
return NULL;
}
static void
add_to_unconfirmed(struct nfs4_client *clp)
{
unsigned int idhashval;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
add_clp_to_name_tree(clp, &nn->unconf_name_tree);
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
renew_client_locked(clp);
}
static void
move_to_confirmed(struct nfs4_client *clp)
{
unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
lockdep_assert_held(&nn->client_lock);
list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
add_clp_to_name_tree(clp, &nn->conf_name_tree);
set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
trace_nfsd_clid_confirmed(&clp->cl_clientid);
renew_client_locked(clp);
}
static struct nfs4_client *
find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
{
struct nfs4_client *clp;
unsigned int idhashval = clientid_hashval(clid->cl_id);
list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
if (same_clid(&clp->cl_clientid, clid)) {
if ((bool)clp->cl_minorversion != sessions)
return NULL;
renew_client_locked(clp);
return clp;
}
}
return NULL;
}
static struct nfs4_client *
find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
{
struct list_head *tbl = nn->conf_id_hashtbl;
lockdep_assert_held(&nn->client_lock);
return find_client_in_id_table(tbl, clid, sessions);
}
static struct nfs4_client *
find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
{
struct list_head *tbl = nn->unconf_id_hashtbl;
lockdep_assert_held(&nn->client_lock);
return find_client_in_id_table(tbl, clid, sessions);
}
static bool clp_used_exchangeid(struct nfs4_client *clp)
{
return clp->cl_exchange_flags != 0;
}
static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
{
lockdep_assert_held(&nn->client_lock);
return find_clp_in_name_tree(name, &nn->conf_name_tree);
}
static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
{
lockdep_assert_held(&nn->client_lock);
return find_clp_in_name_tree(name, &nn->unconf_name_tree);
}
static void
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
{
struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
struct sockaddr *sa = svc_addr(rqstp);
u32 scopeid = rpc_get_scope_id(sa);
unsigned short expected_family;
/* Currently, we only support tcp and tcp6 for the callback channel */
if (se->se_callback_netid_len == 3 &&
!memcmp(se->se_callback_netid_val, "tcp", 3))
expected_family = AF_INET;
else if (se->se_callback_netid_len == 4 &&
!memcmp(se->se_callback_netid_val, "tcp6", 4))
expected_family = AF_INET6;
else
goto out_err;
conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
se->se_callback_addr_len,
(struct sockaddr *)&conn->cb_addr,
sizeof(conn->cb_addr));
if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
goto out_err;
if (conn->cb_addr.ss_family == AF_INET6)
((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
conn->cb_prog = se->se_callback_prog;
conn->cb_ident = se->se_callback_ident;
memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
trace_nfsd_cb_args(clp, conn);
return;
out_err:
conn->cb_addr.ss_family = AF_UNSPEC;
conn->cb_addrlen = 0;
trace_nfsd_cb_nodelegs(clp);
return;
}
/*
* Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
*/
static void
nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
{
struct xdr_buf *buf = resp->xdr->buf;
struct nfsd4_slot *slot = resp->cstate.slot;
unsigned int base;
/*
* RFC 5661 Section 2.10.6.1.2:
*
* Any time SEQUENCE ... returns an error ... [t]he replier MUST NOT
* modify the reply cache entry for the slot whenever an error is
* returned from SEQUENCE ...
*
* Because nfsd4_store_cache_entry is called only by
* nfsd4_sequence_done(), nfsd4_store_cache_entry() is called only
* when a SEQUENCE operation was part of the COMPOUND.
* nfs41_check_op_ordering() ensures SEQUENCE is the first op.
*/
if (resp->opcnt == 1 && resp->cstate.status != nfs_ok)
return;
slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
slot->sl_opcnt = resp->opcnt;
slot->sl_status = resp->cstate.status;
free_svc_cred(&slot->sl_cred);
copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
if (!(resp->cstate.slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
slot->sl_flags &= ~NFSD4_SLOT_CACHED;
return;
}
slot->sl_flags |= NFSD4_SLOT_CACHED;
base = resp->cstate.data_offset;
slot->sl_datalen = buf->len - base;
if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
WARN(1, "%s: sessions DRC could not cache compound\n",
__func__);
return;
}
/*
* The sequence operation is not cached because we can use the slot and
* session values.
*/
static __be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
struct nfsd4_sequence *seq)
{
struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
struct nfsd4_slot *slot = resp->cstate.slot;
struct xdr_stream *xdr = resp->xdr;
__be32 *p;
dprintk("--> %s slot %p\n", __func__, slot);
/* Always encode the SEQUENCE response. */
nfsd4_encode_operation(resp, &args->ops[0]);
if (args->opcnt == 1)
/* A solo SEQUENCE - nothing was cached */
return args->ops[0].status;
if (!(slot->sl_flags & NFSD4_SLOT_CACHED)) {
/* We weren't asked to cache this. */
struct nfsd4_op *op;
op = &args->ops[resp->opcnt++];
op->status = nfserr_retry_uncached_rep;
nfsd4_encode_operation(resp, op);
return op->status;
}
/* return reply from cache */
p = xdr_reserve_space(xdr, slot->sl_datalen);
if (!p) {
WARN_ON_ONCE(1);
return nfserr_serverfault;
}
xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
xdr_commit_encode(xdr);
resp->opcnt = slot->sl_opcnt;
return slot->sl_status;
}
/*
* Set the exchange_id flags returned by the server.
*/
static void
nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
{
#ifdef CONFIG_NFSD_PNFS
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
#else
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
#endif
/* Referrals are supported, Migration is not. */
new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
/* set the wire flags to return to client. */
clid->flags = new->cl_exchange_flags;
}
static bool client_has_openowners(struct nfs4_client *clp)
{
struct nfs4_openowner *oo;
list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
if (!list_empty(&oo->oo_owner.so_stateids))
return true;
}
return false;
}
static bool client_has_state(struct nfs4_client *clp)
{
return client_has_openowners(clp)
#ifdef CONFIG_NFSD_PNFS
|| !list_empty(&clp->cl_lo_states)
#endif
|| !list_empty(&clp->cl_delegations)
|| !list_empty(&clp->cl_sessions)
|| nfsd4_has_active_async_copies(clp);
}
static __be32 copy_impl_id(struct nfs4_client *clp,
struct nfsd4_exchange_id *exid)
{
if (!exid->nii_domain.data)
return 0;
xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
if (!clp->cl_nii_domain.data)
return nfserr_jukebox;
xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
if (!clp->cl_nii_name.data)
return nfserr_jukebox;
clp->cl_nii_time = exid->nii_time;
return 0;
}
__be32
nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_exchange_id *exid = &u->exchange_id;
struct nfs4_client *conf, *new;
struct nfs4_client *unconf = NULL;
__be32 status;
char addr_str[INET6_ADDRSTRLEN];
nfs4_verifier verf = exid->verifier;
struct sockaddr *sa = svc_addr(rqstp);
bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
rpc_ntop(sa, addr_str, sizeof(addr_str));
dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
"ip_addr=%s flags %x, spa_how %u\n",
__func__, rqstp, exid, exid->clname.len, exid->clname.data,
addr_str, exid->flags, exid->spa_how);
exid->server_impl_name = kasprintf(GFP_KERNEL, "%s %s %s %s",
utsname()->sysname, utsname()->release,
utsname()->version, utsname()->machine);
if (!exid->server_impl_name)
return nfserr_jukebox;
if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
return nfserr_inval;
new = create_client(exid->clname, rqstp, &verf);
if (new == NULL)
return nfserr_jukebox;
status = copy_impl_id(new, exid);
if (status)
goto out_nolock;
switch (exid->spa_how) {
case SP4_MACH_CRED:
exid->spo_must_enforce[0] = 0;
exid->spo_must_enforce[1] = (
1 << (OP_BIND_CONN_TO_SESSION - 32) |
1 << (OP_EXCHANGE_ID - 32) |
1 << (OP_CREATE_SESSION - 32) |
1 << (OP_DESTROY_SESSION - 32) |
1 << (OP_DESTROY_CLIENTID - 32));
exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
1 << (OP_OPEN_DOWNGRADE) |
1 << (OP_LOCKU) |
1 << (OP_DELEGRETURN));
exid->spo_must_allow[1] &= (
1 << (OP_TEST_STATEID - 32) |
1 << (OP_FREE_STATEID - 32));
if (!svc_rqst_integrity_protected(rqstp)) {
status = nfserr_inval;
goto out_nolock;
}
/*
* Sometimes userspace doesn't give us a principal.
* Which is a bug, really. Anyway, we can't enforce
* MACH_CRED in that case, better to give up now:
*/
if (!new->cl_cred.cr_principal &&
!new->cl_cred.cr_raw_principal) {
status = nfserr_serverfault;
goto out_nolock;
}
new->cl_mach_cred = true;
break;
case SP4_NONE:
break;
default: /* checked by xdr code */
WARN_ON_ONCE(1);
fallthrough;
case SP4_SSV:
status = nfserr_encr_alg_unsupp;
goto out_nolock;
}
/* Cases below refer to rfc 5661 section 18.35.4: */
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&exid->clname, nn);
if (conf) {
bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
bool verfs_match = same_verf(&verf, &conf->cl_verifier);
if (update) {
if (!clp_used_exchangeid(conf)) { /* buggy client */
status = nfserr_inval;
goto out;
}
if (!nfsd4_mach_creds_match(conf, rqstp)) {
status = nfserr_wrong_cred;
goto out;
}
if (!creds_match) { /* case 9 */
status = nfserr_perm;
goto out;
}
if (!verfs_match) { /* case 8 */
status = nfserr_not_same;
goto out;
}
/* case 6 */
exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
trace_nfsd_clid_confirmed_r(conf);
goto out_copy;
}
if (!creds_match) { /* case 3 */
if (client_has_state(conf)) {
status = nfserr_clid_inuse;
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
goto out_new;
}
if (verfs_match) { /* case 2 */
conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
trace_nfsd_clid_confirmed_r(conf);
goto out_copy;
}
/* case 5, client reboot */
trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
conf = NULL;
goto out_new;
}
if (update) { /* case 7 */
status = nfserr_noent;
goto out;
}
unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
if (unconf) /* case 4, possible retry or client restart */
unhash_client_locked(unconf);
/* case 1, new owner ID */
trace_nfsd_clid_fresh(new);
out_new:
if (conf) {
status = mark_client_expired_locked(conf);
if (status)
goto out;
trace_nfsd_clid_replaced(&conf->cl_clientid);
}
new->cl_minorversion = cstate->minorversion;
new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
/* Contrived initial CREATE_SESSION response */
new->cl_cs_slot.sl_status = nfserr_seq_misordered;
add_to_unconfirmed(new);
swap(new, conf);
out_copy:
exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
exid->clientid.cl_id = conf->cl_clientid.cl_id;
exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
nfsd4_set_ex_flags(conf, exid);
exid->nii_domain.len = sizeof("kernel.org") - 1;
exid->nii_domain.data = "kernel.org";
/*
* Note that RFC 8881 places no length limit on
* nii_name, but this implementation permits no
* more than NFS4_OPAQUE_LIMIT bytes.
*/
exid->nii_name.len = strlen(exid->server_impl_name);
if (exid->nii_name.len > NFS4_OPAQUE_LIMIT)
exid->nii_name.len = NFS4_OPAQUE_LIMIT;
exid->nii_name.data = exid->server_impl_name;
/* just send zeros - the date is in nii_name */
exid->nii_time.tv_sec = 0;
exid->nii_time.tv_nsec = 0;
dprintk("nfsd4_exchange_id seqid %d flags %x\n",
conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
status = nfs_ok;
out:
spin_unlock(&nn->client_lock);
out_nolock:
if (new)
expire_client(new);
if (unconf) {
trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
expire_client(unconf);
}
return status;
}
void
nfsd4_exchange_id_release(union nfsd4_op_u *u)
{
struct nfsd4_exchange_id *exid = &u->exchange_id;
kfree(exid->server_impl_name);
}
static __be32 check_slot_seqid(u32 seqid, u32 slot_seqid, u8 flags)
{
/* The slot is in use, and no response has been sent. */
if (flags & NFSD4_SLOT_INUSE) {
if (seqid == slot_seqid)
return nfserr_jukebox;
else
return nfserr_seq_misordered;
}
/* Note unsigned 32-bit arithmetic handles wraparound: */
if (likely(seqid == slot_seqid + 1))
return nfs_ok;
if ((flags & NFSD4_SLOT_REUSED) && seqid == 1)
return nfs_ok;
if (seqid == slot_seqid)
return nfserr_replay_cache;
return nfserr_seq_misordered;
}
/*
* Cache the create session result into the create session single DRC
* slot cache by saving the xdr structure. sl_seqid has been set.
* Do this for solo or embedded create session operations.
*/
static void
nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
struct nfsd4_clid_slot *slot, __be32 nfserr)
{
slot->sl_status = nfserr;
memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
}
static __be32
nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
struct nfsd4_clid_slot *slot)
{
memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
return slot->sl_status;
}
#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
1 + /* MIN tag is length with zero, only length */ \
3 + /* version, opcount, opcode */ \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
/* seqid, slotID, slotID, cache */ \
4 ) * sizeof(__be32))
#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2 + /* verifier: AUTH_NULL, length 0 */\
1 + /* status */ \
1 + /* MIN tag is length with zero, only length */ \
3 + /* opcount, opcode, opstatus*/ \
XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
/* seqid, slotID, slotID, slotID, status */ \
5 ) * sizeof(__be32))
static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
{
u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
return nfserr_toosmall;
if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
return nfserr_toosmall;
ca->headerpadsz = 0;
ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
return nfs_ok;
}
/*
* Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
* These are based on similar macros in linux/sunrpc/msg_prot.h .
*/
#define RPC_MAX_HEADER_WITH_AUTH_SYS \
(RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
#define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
(RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
sizeof(__be32))
static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
{
ca->headerpadsz = 0;
if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
return nfserr_toosmall;
if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
return nfserr_toosmall;
ca->maxresp_cached = 0;
if (ca->maxops < 2)
return nfserr_toosmall;
return nfs_ok;
}
static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
{
switch (cbs->flavor) {
case RPC_AUTH_NULL:
case RPC_AUTH_UNIX:
return nfs_ok;
default:
/*
* GSS case: the spec doesn't allow us to return this
* error. But it also doesn't allow us not to support
* GSS.
* I'd rather this fail hard than return some error the
* client might think it can already handle:
*/
return nfserr_encr_alg_unsupp;
}
}
__be32
nfsd4_create_session(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
{
struct nfsd4_create_session *cr_ses = &u->create_session;
struct sockaddr *sa = svc_addr(rqstp);
struct nfs4_client *conf, *unconf;
struct nfsd4_clid_slot *cs_slot;
struct nfs4_client *old = NULL;
struct nfsd4_session *new;
struct nfsd4_conn *conn;
__be32 status = 0;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
return nfserr_inval;
status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
if (status)
return status;
status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
if (status)
return status;
status = check_backchannel_attrs(&cr_ses->back_channel);
if (status)
goto out_err;
status = nfserr_jukebox;
new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
if (!new)
goto out_err;
conn = alloc_conn_from_crses(rqstp, cr_ses);
if (!conn)
goto out_free_session;
spin_lock(&nn->client_lock);
/* RFC 8881 Section 18.36.4 Phase 1: Client record look-up. */
unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
conf = find_confirmed_client(&cr_ses->clientid, true, nn);
if (!conf && !unconf) {
status = nfserr_stale_clientid;
goto out_free_conn;
}
/* RFC 8881 Section 18.36.4 Phase 2: Sequence ID processing. */
if (conf) {
cs_slot = &conf->cl_cs_slot;
trace_nfsd_slot_seqid_conf(conf, cr_ses);
} else {
cs_slot = &unconf->cl_cs_slot;
trace_nfsd_slot_seqid_unconf(unconf, cr_ses);
}
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
switch (status) {
case nfs_ok:
cs_slot->sl_seqid++;
cr_ses->seqid = cs_slot->sl_seqid;
break;
case nfserr_replay_cache:
status = nfsd4_replay_create_session(cr_ses, cs_slot);
fallthrough;
case nfserr_jukebox:
/* The server MUST NOT cache NFS4ERR_DELAY */
goto out_free_conn;
default:
goto out_cache_error;
}
/* RFC 8881 Section 18.36.4 Phase 3: Client ID confirmation. */
if (conf) {
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(conf, rqstp))
goto out_cache_error;
} else {
status = nfserr_clid_inuse;
if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
!rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
trace_nfsd_clid_cred_mismatch(unconf, rqstp);
goto out_cache_error;
}
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(unconf, rqstp))
goto out_cache_error;
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
status = mark_client_expired_locked(old);
if (status)
goto out_expired_error;
trace_nfsd_clid_replaced(&old->cl_clientid);
}
move_to_confirmed(unconf);
conf = unconf;
}
/* RFC 8881 Section 18.36.4 Phase 4: Session creation. */
status = nfs_ok;
/* Persistent sessions are not supported */
cr_ses->flags &= ~SESSION4_PERSIST;
/* Upshifting from TCP to RDMA is not supported */
cr_ses->flags &= ~SESSION4_RDMA;
/* Report the correct number of backchannel slots */
cr_ses->back_channel.maxreqs = new->se_cb_highest_slot + 1;
init_session(rqstp, new, conf, cr_ses);
nfsd4_get_session_locked(new);
memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
NFS4_MAX_SESSIONID_LEN);
/* cache solo and embedded create sessions under the client_lock */
nfsd4_cache_create_session(cr_ses, cs_slot, status);
spin_unlock(&nn->client_lock);
if (conf == unconf)
fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
/* init connection and backchannel */
nfsd4_init_conn(rqstp, conn, new);
nfsd4_put_session(new);
if (old)
expire_client(old);
return status;
out_expired_error:
/*
* Revert the slot seq_nr change so the server will process
* the client's resend instead of returning a cached response.
*/
if (status == nfserr_jukebox) {
cs_slot->sl_seqid--;
cr_ses->seqid = cs_slot->sl_seqid;
goto out_free_conn;
}
out_cache_error:
nfsd4_cache_create_session(cr_ses, cs_slot, status);
out_free_conn:
spin_unlock(&nn->client_lock);
free_conn(conn);
out_free_session:
__free_session(new);
out_err:
return status;
}
static __be32 nfsd4_map_bcts_dir(u32 *dir)
{
switch (*dir) {
case NFS4_CDFC4_FORE:
case NFS4_CDFC4_BACK:
return nfs_ok;
case NFS4_CDFC4_FORE_OR_BOTH:
case NFS4_CDFC4_BACK_OR_BOTH:
*dir = NFS4_CDFC4_BOTH;
return nfs_ok;
}
return nfserr_inval;
}
__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
struct nfsd4_session *session = cstate->session;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
__be32 status;
status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
if (status)
return status;
spin_lock(&nn->client_lock);
session->se_cb_prog = bc->bc_cb_program;
session->se_cb_sec = bc->bc_cb_sec;
spin_unlock(&nn->client_lock);
nfsd4_probe_callback(session->se_client);
return nfs_ok;
}
static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
{
struct nfsd4_conn *c;
list_for_each_entry(c, &s->se_conns, cn_persession) {
if (c->cn_xprt == xpt) {
return c;
}
}
return NULL;
}
static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
{
struct nfs4_client *clp = session->se_client;
struct svc_xprt *xpt = rqst->rq_xprt;
struct nfsd4_conn *c;
__be32 status;
/* Following the last paragraph of RFC 5661 Section 18.34.3: */
spin_lock(&clp->cl_lock);
c = __nfsd4_find_conn(xpt, session);
if (!c)
status = nfserr_noent;
else if (req == c->cn_flags)
status = nfs_ok;
else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
c->cn_flags != NFS4_CDFC4_BACK)
status = nfs_ok;
else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
c->cn_flags != NFS4_CDFC4_FORE)
status = nfs_ok;
else
status = nfserr_inval;
spin_unlock(&clp->cl_lock);
if (status == nfs_ok && conn)
*conn = c;
return status;
}
__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
__be32 status;
struct nfsd4_conn *conn;
struct nfsd4_session *session;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
if (!nfsd4_last_compound_op(rqstp))
return nfserr_not_only_op;
spin_lock(&nn->client_lock);
session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
spin_unlock(&nn->client_lock);
if (!session)
goto out_no_session;
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(session->se_client, rqstp))
goto out;
status = nfsd4_match_existing_connection(rqstp, session,
bcts->dir, &conn);
if (status == nfs_ok) {
if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
bcts->dir == NFS4_CDFC4_BACK)
conn->cn_flags |= NFS4_CDFC4_BACK;
nfsd4_probe_callback(session->se_client);
goto out;
}
if (status == nfserr_inval)
goto out;
status = nfsd4_map_bcts_dir(&bcts->dir);
if (status)
goto out;
conn = alloc_conn(rqstp, bcts->dir);
status = nfserr_jukebox;
if (!conn)
goto out;
nfsd4_init_conn(rqstp, conn, session);
status = nfs_ok;
out:
nfsd4_put_session(session);
out_no_session:
return status;
}
static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
{
if (!cstate->session)
return false;
return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
}
__be32
nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
struct nfsd4_session *ses;
__be32 status;
int ref_held_by_me = 0;
struct net *net = SVC_NET(r);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
status = nfserr_not_only_op;
if (nfsd4_compound_in_session(cstate, sessionid)) {
if (!nfsd4_last_compound_op(r))
goto out;
ref_held_by_me++;
}
dump_sessionid(__func__, sessionid);
spin_lock(&nn->client_lock);
ses = find_in_sessionid_hashtbl(sessionid, net, &status);
if (!ses)
goto out_client_lock;
status = nfserr_wrong_cred;
if (!nfsd4_mach_creds_match(ses->se_client, r))
goto out_put_session;
status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
if (status)
goto out_put_session;
unhash_session(ses);
spin_unlock(&nn->client_lock);
nfsd4_probe_callback_sync(ses->se_client);
spin_lock(&nn->client_lock);
status = nfs_ok;
out_put_session:
nfsd4_put_session_locked(ses);
out_client_lock:
spin_unlock(&nn->client_lock);
out:
return status;
}
static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
{
struct nfs4_client *clp = ses->se_client;
struct nfsd4_conn *c;
__be32 status = nfs_ok;
int ret;
spin_lock(&clp->cl_lock);
c = __nfsd4_find_conn(new->cn_xprt, ses);
if (c)
goto out_free;
status = nfserr_conn_not_bound_to_session;
if (clp->cl_mach_cred)
goto out_free;
__nfsd4_hash_conn(new, ses);
spin_unlock(&clp->cl_lock);
ret = nfsd4_register_conn(new);
if (ret)
/* oops; xprt is already down: */
nfsd4_conn_lost(&new->cn_xpt_user);
return nfs_ok;
out_free:
spin_unlock(&clp->cl_lock);
free_conn(new);
return status;
}
static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
{
struct nfsd4_compoundargs *args = rqstp->rq_argp;
return args->opcnt > session->se_fchannel.maxops;
}
static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
struct nfsd4_session *session)
{
struct xdr_buf *xb = &rqstp->rq_arg;
return xb->len > session->se_fchannel.maxreq_sz;
}
static bool replay_matches_cache(struct svc_rqst *rqstp,
struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
{
struct nfsd4_compoundargs *argp = rqstp->rq_argp;
if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
(bool)seq->cachethis)
return false;
/*
* If there's an error then the reply can have fewer ops than
* the call.
*/
if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
return false;
/*
* But if we cached a reply with *more* ops than the call you're
* sending us now, then this new call is clearly not really a
* replay of the old one:
*/
if (slot->sl_opcnt > argp->opcnt)
return false;
/* This is the only check explicitly called by spec: */
if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
return false;
/*
* There may be more comparisons we could actually do, but the
* spec doesn't require us to catch every case where the calls
* don't match (that would require caching the call as well as
* the reply), so we don't bother.
*/
return true;
}
/*
* Note that the response is constructed here both for the case
* of a new SEQUENCE request and for a replayed SEQUENCE request.
* We do not cache SEQUENCE responses as SEQUENCE is idempotent.
*/
static void nfsd4_construct_sequence_response(struct nfsd4_session *session,
struct nfsd4_sequence *seq)
{
struct nfs4_client *clp = session->se_client;
seq->maxslots_response = max(session->se_target_maxslots,
seq->maxslots);
seq->target_maxslots = session->se_target_maxslots;
switch (clp->cl_cb_state) {
case NFSD4_CB_DOWN:
seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
break;
case NFSD4_CB_FAULT:
seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
break;
default:
seq->status_flags = 0;
}
if (!list_empty(&clp->cl_revoked))
seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
if (atomic_read(&clp->cl_admin_revoked))
seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED;
}
static bool nfsd4_slots_inuse(struct nfsd4_session *ses, int from)
{
int i;
for (i = from; i < ses->se_fchannel.maxreqs; i++) {
struct nfsd4_slot *slot = xa_load(&ses->se_slots, i);
if (slot->sl_flags & NFSD4_SLOT_INUSE)
return true;
}
return false;
}
__be32
nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_sequence *seq = &u->sequence;
struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct xdr_stream *xdr = resp->xdr;
struct nfsd4_session *session;
struct nfs4_client *clp;
struct nfsd4_slot *slot;
struct nfsd4_conn *conn;
__be32 status;
int buflen;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
if (resp->opcnt != 1)
return nfserr_sequence_pos;
/*
* Will be either used or freed by nfsd4_sequence_check_conn
* below.
*/
conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
if (!conn)
return nfserr_jukebox;
spin_lock(&nn->client_lock);
session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
if (!session)
goto out_no_session;
clp = session->se_client;
status = nfserr_too_many_ops;
if (nfsd4_session_too_many_ops(rqstp, session))
goto out_put_session;
status = nfserr_req_too_big;
if (nfsd4_request_too_big(rqstp, session))
goto out_put_session;
status = nfserr_badslot;
if (seq->slotid >= session->se_fchannel.maxreqs)
goto out_put_session;
slot = xa_load(&session->se_slots, seq->slotid);
dprintk("%s: slotid %d\n", __func__, seq->slotid);
trace_nfsd_slot_seqid_sequence(clp, seq, slot);
nfsd4_construct_sequence_response(session, seq);
status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_flags);
if (status == nfserr_replay_cache) {
status = nfserr_seq_misordered;
if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
goto out_put_session;
status = nfserr_seq_false_retry;
if (!replay_matches_cache(rqstp, seq, slot))
goto out_put_session;
cstate->slot = slot;
cstate->session = session;
cstate->clp = clp;
/* Return the cached reply status and set cstate->status
* for nfsd4_proc_compound processing */
status = nfsd4_replay_cache_entry(resp, seq);
cstate->status = nfserr_replay_cache;
goto out;
}
if (status)
goto out_put_session;
status = nfsd4_sequence_check_conn(conn, session);
conn = NULL;
if (status)
goto out_put_session;
if (session->se_target_maxslots < session->se_fchannel.maxreqs &&
slot->sl_generation == session->se_slot_gen &&
seq->maxslots <= session->se_target_maxslots &&
seq->slotid < session->se_target_maxslots &&
!nfsd4_slots_inuse(session, session->se_target_maxslots))
/* Client acknowledged our reduce maxreqs */
free_session_slots(session, session->se_target_maxslots);
buflen = (seq->cachethis) ?
session->se_fchannel.maxresp_cached :
session->se_fchannel.maxresp_sz;
status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
nfserr_rep_too_big;
if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
goto out_put_session;
svc_reserve_auth(rqstp, buflen);
status = nfs_ok;
/* Success! accept new slot seqid */
slot->sl_seqid = seq->seqid;
slot->sl_flags &= ~NFSD4_SLOT_REUSED;
slot->sl_flags |= NFSD4_SLOT_INUSE;
slot->sl_generation = session->se_slot_gen;
if (seq->cachethis)
slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
else
slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
cstate->slot = slot;
cstate->session = session;
cstate->clp = clp;
/*
* If the client ever uses the highest available slot,
* gently try to allocate another 20%. This allows
* fairly quick growth without grossly over-shooting what
* the client might use.
*
* Bound that growth by the service's thread ceiling:
* slots beyond the nfsd thread count cannot raise this
* client's throughput, only deepen its backlog. Cap each
* session independently, since a session cannot use
* another's slots; a shared budget would let idle sessions
* pin an active client small. Compare against the
* configured maximum, not the running thread count, so a
* client resuming from idle can grow back before the pool
* scales up.
*/
if (seq->slotid == session->se_fchannel.maxreqs - 1 &&
session->se_target_maxslots >= session->se_fchannel.maxreqs) {
int s = session->se_fchannel.maxreqs;
int ceiling = min_t(int, NFSD_MAX_SLOTS_PER_SESSION,
svc_serv_maxthreads(rqstp->rq_server));
int cnt = min(DIV_ROUND_UP(s, 5), ceiling - s);
void *prev_slot;
while (cnt-- > 0) {
/*
* GFP_NOWAIT both allows allocation under a
* spinlock, and only succeeds if there is
* plenty of memory.
*/
slot = nfsd4_alloc_slot(&session->se_fchannel, s,
GFP_NOWAIT);
if (!slot)
break;
prev_slot = xa_load(&session->se_slots, s);
if (xa_is_value(prev_slot)) {
slot->sl_seqid = xa_to_value(prev_slot);
slot->sl_flags |= NFSD4_SLOT_REUSED;
}
if (!xa_is_err(xa_store(&session->se_slots, s, slot,
GFP_NOWAIT))) {
s += 1;
session->se_fchannel.maxreqs = s;
atomic_add(s - session->se_target_maxslots,
&nfsd_total_target_slots);
session->se_target_maxslots = s;
} else {
kfree(slot);
break;
}
}
}
out:
trace_nfsd_seq4_status(rqstp, seq);
out_no_session:
if (conn)
free_conn(conn);
spin_unlock(&nn->client_lock);
return status;
out_put_session:
nfsd4_put_session_locked(session);
goto out_no_session;
}
void
nfsd4_sequence_done(struct nfsd4_compoundres *resp)
{
struct nfsd4_compound_state *cs = &resp->cstate;
if (nfsd4_has_session(cs)) {
if (cs->status != nfserr_replay_cache) {
nfsd4_store_cache_entry(resp);
cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
}
/* Drop session reference that was taken in nfsd4_sequence() */
nfsd4_put_session(cs->session);
} else if (cs->clp)
put_client_renew(cs->clp);
}
__be32
nfsd4_destroy_clientid(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
struct nfs4_client *conf, *unconf;
struct nfs4_client *clp = NULL;
__be32 status = 0;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
spin_lock(&nn->client_lock);
unconf = find_unconfirmed_client(&dc->clientid, true, nn);
conf = find_confirmed_client(&dc->clientid, true, nn);
WARN_ON_ONCE(conf && unconf);
if (conf) {
if (client_has_state(conf)) {
status = nfserr_clientid_busy;
goto out;
}
status = mark_client_expired_locked(conf);
if (status)
goto out;
clp = conf;
} else if (unconf)
clp = unconf;
else {
status = nfserr_stale_clientid;
goto out;
}
if (!nfsd4_mach_creds_match(clp, rqstp)) {
clp = NULL;
status = nfserr_wrong_cred;
goto out;
}
trace_nfsd_clid_destroyed(&clp->cl_clientid);
unhash_client_locked(clp);
out:
spin_unlock(&nn->client_lock);
if (clp)
expire_client(clp);
return status;
}
__be32
nfsd4_reclaim_complete(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
{
struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
struct nfs4_client *clp = cstate->clp;
__be32 status = 0;
if (rc->rca_one_fs) {
if (!cstate->current_fh.fh_dentry)
return nfserr_nofilehandle;
/*
* We don't take advantage of the rca_one_fs case.
* That's OK, it's optional, we can safely ignore it.
*/
return nfs_ok;
}
status = nfserr_complete_already;
if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
goto out;
status = nfserr_stale_clientid;
if (is_client_expired(clp))
/*
* The following error isn't really legal.
* But we only get here if the client just explicitly
* destroyed the client. Surely it no longer cares what
* error it gets back on an operation for the dead
* client.
*/
goto out;
status = nfs_ok;
trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
nfsd4_client_record_create(clp);
inc_reclaim_complete(clp);
out:
return status;
}
__be32
nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_setclientid *setclid = &u->setclientid;
struct xdr_netobj clname = setclid->se_name;
nfs4_verifier clverifier = setclid->se_verf;
struct nfs4_client *conf, *new;
struct nfs4_client *unconf = NULL;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
new = create_client(clname, rqstp, &clverifier);
if (new == NULL)
return nfserr_jukebox;
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&clname, nn);
if (conf && client_has_state(conf)) {
status = nfserr_clid_inuse;
if (clp_used_exchangeid(conf))
goto out;
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
}
unconf = find_unconfirmed_client_by_name(&clname, nn);
if (unconf)
unhash_client_locked(unconf);
if (conf) {
if (same_verf(&conf->cl_verifier, &clverifier)) {
copy_clid(new, conf);
gen_confirm(new, nn);
} else
trace_nfsd_clid_verf_mismatch(conf, rqstp,
&clverifier);
} else
trace_nfsd_clid_fresh(new);
new->cl_minorversion = 0;
gen_callback(new, setclid, rqstp);
add_to_unconfirmed(new);
setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
new = NULL;
status = nfs_ok;
out:
spin_unlock(&nn->client_lock);
if (new)
free_client(new);
if (unconf) {
trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
expire_client(unconf);
}
return status;
}
__be32
nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_setclientid_confirm *setclientid_confirm =
&u->setclientid_confirm;
struct nfs4_client *conf, *unconf;
struct nfs4_client *old = NULL;
nfs4_verifier confirm = setclientid_confirm->sc_confirm;
clientid_t * clid = &setclientid_confirm->sc_clientid;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if (STALE_CLIENTID(clid, nn))
return nfserr_stale_clientid;
spin_lock(&nn->client_lock);
conf = find_confirmed_client(clid, false, nn);
unconf = find_unconfirmed_client(clid, false, nn);
/*
* We try hard to give out unique clientid's, so if we get an
* attempt to confirm the same clientid with a different cred,
* the client may be buggy; this should never happen.
*
* Nevertheless, RFC 7530 recommends INUSE for this case:
*/
status = nfserr_clid_inuse;
if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
trace_nfsd_clid_cred_mismatch(unconf, rqstp);
goto out;
}
if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
trace_nfsd_clid_cred_mismatch(conf, rqstp);
goto out;
}
if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
if (conf && same_verf(&confirm, &conf->cl_confirm)) {
status = nfs_ok;
} else
status = nfserr_stale_clientid;
goto out;
}
status = nfs_ok;
if (conf) {
if (get_client_locked(conf) == nfs_ok) {
old = unconf;
unhash_client_locked(old);
nfsd4_change_callback(conf, &unconf->cl_cb_conn);
} else {
conf = NULL;
}
}
if (!conf) {
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
status = nfserr_clid_inuse;
if (client_has_state(old)
&& !same_creds(&unconf->cl_cred,
&old->cl_cred)) {
old = NULL;
goto out;
}
status = mark_client_expired_locked(old);
if (status) {
old = NULL;
goto out;
}
trace_nfsd_clid_replaced(&old->cl_clientid);
}
status = get_client_locked(unconf);
if (status != nfs_ok) {
old = NULL;
goto out;
}
move_to_confirmed(unconf);
conf = unconf;
}
spin_unlock(&nn->client_lock);
if (conf == unconf)
fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
nfsd4_probe_callback(conf);
spin_lock(&nn->client_lock);
put_client_renew_locked(conf);
out:
spin_unlock(&nn->client_lock);
if (old)
expire_client(old);
return status;
}
static struct nfs4_file *nfsd4_alloc_file(void)
{
return kmem_cache_alloc(file_slab, GFP_KERNEL);
}
/* OPEN Share state helper functions */
static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp)
{
refcount_set(&fp->fi_ref, 1);
spin_lock_init(&fp->fi_lock);
INIT_LIST_HEAD(&fp->fi_stateids);
INIT_LIST_HEAD(&fp->fi_delegations);
INIT_LIST_HEAD(&fp->fi_clnt_odstate);
fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
RCU_INIT_POINTER(fp->fi_deleg_file, NULL);
fp->fi_rdeleg_file = NULL;
fp->fi_had_conflict = false;
fp->fi_share_deny = 0;
memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
memset(fp->fi_access, 0, sizeof(fp->fi_access));
fp->fi_aliased = false;
fp->fi_inode = d_inode(fh->fh_dentry);
#ifdef CONFIG_NFSD_PNFS
INIT_LIST_HEAD(&fp->fi_lo_states);
atomic_set(&fp->fi_lo_recalls, 0);
#endif
}
void
nfsd4_free_slabs(void)
{
kmem_cache_destroy(client_slab);
kmem_cache_destroy(openowner_slab);
kmem_cache_destroy(lockowner_slab);
kmem_cache_destroy(file_slab);
kmem_cache_destroy(stateid_slab);
kmem_cache_destroy(deleg_slab);
kmem_cache_destroy(odstate_slab);
kmem_cache_destroy(async_copy_slab);
}
int
nfsd4_init_slabs(void)
{
client_slab = KMEM_CACHE(nfs4_client, 0);
if (client_slab == NULL)
goto out;
openowner_slab = KMEM_CACHE(nfs4_openowner, 0);
if (openowner_slab == NULL)
goto out_free_client_slab;
lockowner_slab = KMEM_CACHE(nfs4_lockowner, 0);
if (lockowner_slab == NULL)
goto out_free_openowner_slab;
file_slab = KMEM_CACHE(nfs4_file, 0);
if (file_slab == NULL)
goto out_free_lockowner_slab;
stateid_slab = KMEM_CACHE(nfs4_ol_stateid, 0);
if (stateid_slab == NULL)
goto out_free_file_slab;
deleg_slab = KMEM_CACHE(nfs4_delegation, 0);
if (deleg_slab == NULL)
goto out_free_stateid_slab;
odstate_slab = KMEM_CACHE(nfs4_clnt_odstate, 0);
if (odstate_slab == NULL)
goto out_free_deleg_slab;
async_copy_slab = KMEM_CACHE(nfsd4_async_copy, 0);
if (async_copy_slab == NULL)
goto out_free_odstate_slab;
return 0;
out_free_odstate_slab:
kmem_cache_destroy(odstate_slab);
out_free_deleg_slab:
kmem_cache_destroy(deleg_slab);
out_free_stateid_slab:
kmem_cache_destroy(stateid_slab);
out_free_file_slab:
kmem_cache_destroy(file_slab);
out_free_lockowner_slab:
kmem_cache_destroy(lockowner_slab);
out_free_openowner_slab:
kmem_cache_destroy(openowner_slab);
out_free_client_slab:
kmem_cache_destroy(client_slab);
out:
return -ENOMEM;
}
static unsigned long
nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
{
struct nfsd_net *nn = shrink->private_data;
long count;
count = atomic_read(&nn->nfsd_courtesy_clients);
if (!count)
count = atomic_long_read(&num_delegations);
if (count)
queue_work(laundry_wq, &nn->nfsd_shrinker_work);
return (unsigned long)count;
}
static unsigned long
nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
{
return SHRINK_STOP;
}
void
nfsd4_init_leases_net(struct nfsd_net *nn)
{
struct sysinfo si;
u64 max_clients;
nn->nfsd4_lease = 90; /* default lease time */
nn->nfsd4_grace = 90;
nn->clverifier_counter = get_random_u32();
nn->clientid_base = get_random_u32();
nn->clientid_counter = nn->clientid_base + 1;
nn->s2s_cp_cl_id = nn->clientid_counter++;
atomic_set(&nn->nfs4_client_count, 0);
si_meminfo(&si);
max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
max_clients *= NFS4_CLIENTS_PER_GB;
nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
atomic_set(&nn->nfsd_courtesy_clients, 0);
}
enum rp_lock {
RP_UNLOCKED,
RP_LOCKED,
RP_UNHASHED,
};
static void init_nfs4_replay(struct nfs4_replay *rp)
{
rp->rp_status = nfserr_serverfault;
rp->rp_buflen = 0;
rp->rp_buf = rp->rp_ibuf;
rp->rp_locked = RP_UNLOCKED;
}
static int nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
struct nfs4_stateowner *so)
{
if (!nfsd4_has_session(cstate)) {
wait_var_event(&so->so_replay.rp_locked,
cmpxchg(&so->so_replay.rp_locked,
RP_UNLOCKED, RP_LOCKED) != RP_LOCKED);
if (so->so_replay.rp_locked == RP_UNHASHED)
return -EAGAIN;
cstate->replay_owner = nfs4_get_stateowner(so);
}
return 0;
}
void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
{
struct nfs4_stateowner *so = cstate->replay_owner;
if (so != NULL) {
cstate->replay_owner = NULL;
store_release_wake_up(&so->so_replay.rp_locked, RP_UNLOCKED);
nfs4_put_stateowner(so);
}
}
static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
{
struct nfs4_stateowner *sop;
sop = kmem_cache_alloc(slab, GFP_KERNEL);
if (!sop)
return NULL;
xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
if (!sop->so_owner.data) {
kmem_cache_free(slab, sop);
return NULL;
}
INIT_LIST_HEAD(&sop->so_stateids);
sop->so_client = clp;
init_nfs4_replay(&sop->so_replay);
atomic_set(&sop->so_count, 1);
return sop;
}
static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
{
lockdep_assert_held(&clp->cl_lock);
list_add(&oo->oo_owner.so_strhash,
&clp->cl_ownerstr_hashtbl[strhashval]);
list_add(&oo->oo_perclient, &clp->cl_openowners);
}
static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
{
unhash_openowner_locked(openowner(so));
}
static void nfs4_free_openowner(struct nfs4_stateowner *so)
{
struct nfs4_openowner *oo = openowner(so);
kmem_cache_free(openowner_slab, oo);
}
static const struct nfs4_stateowner_operations openowner_ops = {
.so_unhash = nfs4_unhash_openowner,
.so_free = nfs4_free_openowner,
};
static struct nfs4_ol_stateid *
nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_ol_stateid *local, *ret = NULL;
struct nfs4_openowner *oo = open->op_openowner;
lockdep_assert_held(&fp->fi_lock);
list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
/* ignore lock owners */
if (local->st_stateowner->so_is_open_owner == 0)
continue;
if (local->st_stateowner != &oo->oo_owner)
continue;
if (local->st_stid.sc_type == SC_TYPE_OPEN &&
!local->st_stid.sc_status) {
ret = local;
refcount_inc(&ret->st_stid.sc_count);
break;
}
}
return ret;
}
static void nfsd4_drop_revoked_stid(struct nfs4_stid *s)
__releases(&s->sc_client->cl_lock)
{
struct nfs4_client *cl = s->sc_client;
LIST_HEAD(reaplist);
struct nfs4_layout_stateid *ls;
struct nfs4_ol_stateid *stp;
struct nfs4_delegation *dp;
bool unhashed;
switch (s->sc_type) {
case SC_TYPE_OPEN:
stp = openlockstateid(s);
if (unhash_open_stateid(stp, &reaplist))
put_ol_stateid_locked(stp, &reaplist);
spin_unlock(&cl->cl_lock);
free_ol_stateid_reaplist(&reaplist);
break;
case SC_TYPE_LOCK:
stp = openlockstateid(s);
unhashed = unhash_lock_stateid(stp);
spin_unlock(&cl->cl_lock);
if (unhashed)
nfs4_put_stid(s);
break;
case SC_TYPE_DELEG:
dp = delegstateid(s);
list_del_init(&dp->dl_recall_lru);
s->sc_status |= SC_STATUS_FREED;
spin_unlock(&cl->cl_lock);
nfs4_put_stid(s);
break;
case SC_TYPE_LAYOUT:
ls = layoutstateid(s);
list_del_init(&ls->ls_perclnt);
spin_unlock(&cl->cl_lock);
nfs4_put_stid(s);
break;
default:
spin_unlock(&cl->cl_lock);
}
}
static void nfsd40_drop_revoked_stid(struct nfs4_client *cl,
stateid_t *stid)
{
/* NFSv4.0 has no way for the client to tell the server
* that it can forget an admin-revoked stateid.
* So we keep it around until the first time that the
* client uses it, and drop it the first time
* nfserr_admin_revoked is returned.
* For v4.1 and later we wait until explicitly told
* to free the stateid.
*/
if (cl->cl_minorversion == 0) {
struct nfs4_stid *st;
spin_lock(&cl->cl_lock);
st = find_stateid_locked(cl, stid);
if (st)
nfsd4_drop_revoked_stid(st);
else
spin_unlock(&cl->cl_lock);
}
}
static __be32
nfsd4_verify_open_stid(struct nfs4_stid *s)
{
__be32 ret = nfs_ok;
if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
ret = nfserr_admin_revoked;
else if (s->sc_status & SC_STATUS_REVOKED)
ret = nfserr_deleg_revoked;
else if (s->sc_status & SC_STATUS_CLOSED)
ret = nfserr_bad_stateid;
return ret;
}
/* Lock the stateid st_mutex, and deal with races with CLOSE */
static __be32
nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
{
__be32 ret;
mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
ret = nfsd4_verify_open_stid(&stp->st_stid);
if (ret == nfserr_admin_revoked)
nfsd40_drop_revoked_stid(stp->st_stid.sc_client,
&stp->st_stid.sc_stateid);
if (ret != nfs_ok)
mutex_unlock(&stp->st_mutex);
return ret;
}
static struct nfs4_ol_stateid *
nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_ol_stateid *stp;
for (;;) {
spin_lock(&fp->fi_lock);
stp = nfsd4_find_existing_open(fp, open);
spin_unlock(&fp->fi_lock);
if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
break;
nfs4_put_stid(&stp->st_stid);
}
return stp;
}
static struct nfs4_openowner *
find_or_alloc_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
struct nfsd4_compound_state *cstate)
{
struct nfs4_client *clp = cstate->clp;
struct nfs4_openowner *oo, *new = NULL;
retry:
spin_lock(&clp->cl_lock);
oo = find_openstateowner_str(strhashval, open, clp);
if (!oo && new) {
hash_openowner(new, clp, strhashval);
spin_unlock(&clp->cl_lock);
return new;
}
spin_unlock(&clp->cl_lock);
if (oo && !(oo->oo_flags & NFS4_OO_CONFIRMED)) {
/* Replace unconfirmed owners without checking for replay. */
release_openowner(oo);
oo = NULL;
goto retry;
}
if (oo) {
if (new)
nfs4_free_stateowner(&new->oo_owner);
return oo;
}
new = alloc_stateowner(openowner_slab, &open->op_owner, clp);
if (!new)
return NULL;
new->oo_owner.so_ops = &openowner_ops;
new->oo_owner.so_is_open_owner = 1;
new->oo_owner.so_seqid = open->op_seqid;
new->oo_flags = 0;
if (nfsd4_has_session(cstate))
new->oo_flags |= NFS4_OO_CONFIRMED;
new->oo_time = 0;
new->oo_last_closed_stid = NULL;
INIT_LIST_HEAD(&new->oo_close_lru);
goto retry;
}
static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
{
struct nfs4_openowner *oo = open->op_openowner;
struct nfs4_ol_stateid *retstp = NULL;
struct nfs4_ol_stateid *stp;
stp = open->op_stp;
/* We are moving these outside of the spinlocks to avoid the warnings */
mutex_init(&stp->st_mutex);
mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
retry:
spin_lock(&oo->oo_owner.so_client->cl_lock);
spin_lock(&fp->fi_lock);
if (nfs4_openowner_unhashed(oo)) {
mutex_unlock(&stp->st_mutex);
stp = NULL;
goto out_unlock;
}
retstp = nfsd4_find_existing_open(fp, open);
if (retstp)
goto out_unlock;
open->op_stp = NULL;
refcount_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = SC_TYPE_OPEN;
INIT_LIST_HEAD(&stp->st_locks);
stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
get_nfs4_file(fp);
stp->st_stid.sc_file = fp;
stp->st_access_bmap = 0;
stp->st_deny_bmap = 0;
stp->st_openstp = NULL;
list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
out_unlock:
spin_unlock(&fp->fi_lock);
spin_unlock(&oo->oo_owner.so_client->cl_lock);
if (retstp) {
/* Handle races with CLOSE */
if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
nfs4_put_stid(&retstp->st_stid);
goto retry;
}
/* To keep mutex tracking happy */
mutex_unlock(&stp->st_mutex);
stp = retstp;
}
return stp;
}
/*
* In the 4.0 case we need to keep the owners around a little while to handle
* CLOSE replay. We still do need to release any file access that is held by
* them before returning however.
*/
static void
move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
{
struct nfs4_ol_stateid *last;
struct nfs4_openowner *oo = openowner(s->st_stateowner);
struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
nfsd_net_id);
dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
/*
* We know that we hold one reference via nfsd4_close, and another
* "persistent" reference for the client. If the refcount is higher
* than 2, then there are still calls in progress that are using this
* stateid. We can't put the sc_file reference until they are finished.
* Wait for the refcount to drop to 2. Since it has been unhashed,
* there should be no danger of the refcount going back up again at
* this point.
* Some threads with a reference might be waiting for rp_locked,
* so tell them to stop waiting.
*/
store_release_wake_up(&oo->oo_owner.so_replay.rp_locked, RP_UNHASHED);
wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
release_all_access(s);
if (s->st_stid.sc_file) {
put_nfs4_file(s->st_stid.sc_file);
s->st_stid.sc_file = NULL;
}
spin_lock(&nn->client_lock);
last = oo->oo_last_closed_stid;
oo->oo_last_closed_stid = s;
list_move_tail(&oo->oo_close_lru, &nn->close_lru);
oo->oo_time = ktime_get_boottime_seconds();
spin_unlock(&nn->client_lock);
if (last)
nfs4_put_stid(&last->st_stid);
}
static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_lookup(const struct svc_fh *fhp)
{
struct inode *inode = d_inode(fhp->fh_dentry);
struct rhlist_head *tmp, *list;
struct nfs4_file *fi;
rcu_read_lock();
list = rhltable_lookup(&nfs4_file_rhltable, &inode,
nfs4_file_rhash_params);
rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
if (refcount_inc_not_zero(&fi->fi_ref)) {
rcu_read_unlock();
return fi;
}
}
}
rcu_read_unlock();
return NULL;
}
/*
* On hash insertion, identify entries with the same inode but
* distinct filehandles. They will all be on the list returned
* by rhltable_lookup().
*
* inode->i_lock prevents racing insertions from adding an entry
* for the same inode/fhp pair twice.
*/
static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp)
{
struct inode *inode = d_inode(fhp->fh_dentry);
struct rhlist_head *tmp, *list;
struct nfs4_file *ret = NULL;
bool alias_found = false;
struct nfs4_file *fi;
int err;
rcu_read_lock();
spin_lock(&inode->i_lock);
list = rhltable_lookup(&nfs4_file_rhltable, &inode,
nfs4_file_rhash_params);
rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
if (refcount_inc_not_zero(&fi->fi_ref))
ret = fi;
} else
fi->fi_aliased = alias_found = true;
}
if (ret)
goto out_unlock;
nfsd4_file_init(fhp, new);
err = rhltable_insert(&nfs4_file_rhltable, &new->fi_rlist,
nfs4_file_rhash_params);
if (err)
goto out_unlock;
new->fi_aliased = alias_found;
ret = new;
out_unlock:
spin_unlock(&inode->i_lock);
rcu_read_unlock();
return ret;
}
static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi)
{
rhltable_remove(&nfs4_file_rhltable, &fi->fi_rlist,
nfs4_file_rhash_params);
}
/*
* Called to check deny when READ with all zero stateid or
* WRITE with all zero or all one stateid
*/
static __be32
nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
{
struct nfs4_file *fp;
__be32 ret = nfs_ok;
fp = nfsd4_file_hash_lookup(current_fh);
if (!fp)
return ret;
/* Check for conflicting share reservations */
spin_lock(&fp->fi_lock);
if (fp->fi_share_deny & deny_type)
ret = nfserr_locked;
spin_unlock(&fp->fi_lock);
put_nfs4_file(fp);
return ret;
}
static bool nfsd4_deleg_present(const struct inode *inode)
{
struct file_lock_context *ctx = locks_inode_context(inode);
return ctx && !list_empty_careful(&ctx->flc_lease);
}
/**
* nfsd_wait_for_delegreturn - wait for delegations to be returned
* @rqstp: the RPC transaction being executed
* @inode: in-core inode of the file being waited for
*
* The timeout prevents deadlock if all nfsd threads happen to be
* tied up waiting for returning delegations.
*
* Return values:
* %true: delegation was returned
* %false: timed out waiting for delegreturn
*/
bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
{
long __maybe_unused timeo;
timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
NFSD_DELEGRETURN_TIMEOUT);
trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
return timeo > 0;
}
static bool nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
{
struct nfs4_delegation *dp = cb_to_delegation(cb);
struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
nfsd_net_id);
block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
/*
* We can't do this in nfsd_break_deleg_cb because it is
* already holding inode->i_lock.
*
* If the dl_time != 0, then we know that it has already been
* queued for a lease break. Don't queue it again.
*/
spin_lock(&nn->deleg_lock);
if (delegation_hashed(dp) && dp->dl_time == 0) {
dp->dl_time = ktime_get_boottime_seconds();
list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
}
spin_unlock(&nn->deleg_lock);
return true;
}
static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
struct rpc_task *task)
{
struct nfs4_delegation *dp = cb_to_delegation(cb);
trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
if (dp->dl_stid.sc_status)
/* CLOSED or REVOKED */
return 1;
switch (task->tk_status) {
case 0:
return 1;
case -NFS4ERR_DELAY:
rpc_delay(task, 2 * HZ);
return 0;
case -EBADHANDLE:
case -NFS4ERR_BAD_STATEID:
/*
* Race: client probably got cb_recall before open reply
* granting delegation.
*/
if (dp->dl_retries--) {
rpc_delay(task, 2 * HZ);
return 0;
}
fallthrough;
default:
return 1;
}
}
static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
{
struct nfs4_delegation *dp = cb_to_delegation(cb);
nfs4_put_stid(&dp->dl_stid);
}
static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
.prepare = nfsd4_cb_recall_prepare,
.done = nfsd4_cb_recall_done,
.release = nfsd4_cb_recall_release,
.opcode = OP_CB_RECALL,
};
/* Called from break_lease() with flc_lock held. */
static bool
nfsd_break_deleg_cb(struct file_lease *fl)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *) fl->c.flc_owner;
struct nfs4_file *fp = dp->dl_stid.sc_file;
struct nfs4_client *clp = dp->dl_stid.sc_client;
struct nfsd_net *nn;
trace_nfsd_cb_recall(&dp->dl_stid);
dp->dl_recalled = true;
atomic_inc(&clp->cl_delegs_in_recall);
if (try_to_expire_client(clp)) {
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
}
/*
* We don't want the locks code to timeout the lease for us;
* we'll remove it ourself if a delegation isn't returned
* in time:
*/
fl->fl_break_time = 0;
fp->fi_had_conflict = true;
nfsd_break_one_deleg(dp);
return false;
}
/**
* nfsd_breaker_owns_lease - Check if lease conflict was resolved
* @fl: Lock state to check
*
* Return values:
* %true: Lease conflict was resolved
* %false: Lease conflict was not resolved.
*/
static bool nfsd_breaker_owns_lease(struct file_lease *fl)
{
struct nfs4_delegation *dl = fl->c.flc_owner;
struct nfsd_thread_local_info *ntli;
struct svc_rqst *rqst;
struct nfs4_client *clp;
/* Only nfsd leases */
if (fl->fl_lmops != &nfsd_lease_mng_ops)
return false;
rqst = nfsd_current_rqst();
if (!nfsd_v4client(rqst))
return false;
ntli = rqst->rq_private;
clp = *ntli->ntli_lease_breaker;
return dl->dl_stid.sc_client == clp;
}
static int
nfsd_change_deleg_cb(struct file_lease *onlist, int arg,
struct list_head *dispose)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *) onlist->c.flc_owner;
struct nfs4_client *clp = dp->dl_stid.sc_client;
if (arg & F_UNLCK) {
if (dp->dl_recalled)
atomic_dec(&clp->cl_delegs_in_recall);
return lease_modify(onlist, arg, dispose);
} else
return -EAGAIN;
}
/**
* nfsd4_deleg_lm_open_conflict - see if the given file points to an inode that has
* an existing open that would conflict with the
* desired lease.
* @filp: file to check
* @arg: type of lease that we're trying to acquire
*
* The kernel will call into this operation to determine whether there
* are conflicting opens that may prevent the deleg from being granted.
* For nfsd, that check is done at a higher level, so this trivially
* returns 0.
*/
static int
nfsd4_deleg_lm_open_conflict(struct file *filp, int arg)
{
return 0;
}
static const struct lease_manager_operations nfsd_lease_mng_ops = {
.lm_breaker_owns_lease = nfsd_breaker_owns_lease,
.lm_break = nfsd_break_deleg_cb,
.lm_change = nfsd_change_deleg_cb,
.lm_open_conflict = nfsd4_deleg_lm_open_conflict,
};
static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
{
if (nfsd4_has_session(cstate))
return nfs_ok;
if (seqid == so->so_seqid - 1)
return nfserr_replay_me;
if (seqid == so->so_seqid)
return nfs_ok;
return nfserr_bad_seqid;
}
static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
struct nfsd_net *nn)
{
struct nfs4_client *found;
spin_lock(&nn->client_lock);
found = find_confirmed_client(clid, sessions, nn);
if (found)
atomic_inc(&found->cl_rpc_users);
spin_unlock(&nn->client_lock);
return found;
}
static __be32 set_client(clientid_t *clid,
struct nfsd4_compound_state *cstate,
struct nfsd_net *nn)
{
if (cstate->clp) {
if (!same_clid(&cstate->clp->cl_clientid, clid))
return nfserr_stale_clientid;
return nfs_ok;
}
if (STALE_CLIENTID(clid, nn))
return nfserr_stale_clientid;
/*
* We're in the 4.0 case (otherwise the SEQUENCE op would have
* set cstate->clp), so session = false:
*/
cstate->clp = lookup_clientid(clid, false, nn);
if (!cstate->clp)
return nfserr_expired;
return nfs_ok;
}
__be32
nfsd4_process_open1(struct nfsd4_compound_state *cstate,
struct nfsd4_open *open, struct nfsd_net *nn)
{
clientid_t *clientid = &open->op_clientid;
struct nfs4_client *clp = NULL;
unsigned int strhashval;
struct nfs4_openowner *oo = NULL;
__be32 status;
/*
* In case we need it later, after we've already created the
* file and don't want to risk a further failure:
*/
open->op_file = nfsd4_alloc_file();
if (open->op_file == NULL)
return nfserr_jukebox;
status = set_client(clientid, cstate, nn);
if (status)
return status;
clp = cstate->clp;
strhashval = ownerstr_hashval(&open->op_owner);
retry:
oo = find_or_alloc_open_stateowner(strhashval, open, cstate);
open->op_openowner = oo;
if (!oo)
return nfserr_jukebox;
if (nfsd4_cstate_assign_replay(cstate, &oo->oo_owner) == -EAGAIN) {
nfs4_put_stateowner(&oo->oo_owner);
goto retry;
}
status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
if (status)
return status;
open->op_stp = nfs4_alloc_open_stateid(clp);
if (!open->op_stp)
return nfserr_jukebox;
if (nfsd4_has_session(cstate) &&
(cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
open->op_odstate = alloc_clnt_odstate(clp);
if (!open->op_odstate)
return nfserr_jukebox;
}
return nfs_ok;
}
static inline __be32
nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
{
if (!(flags & RD_STATE) && deleg_is_read(dp->dl_type))
return nfserr_openmode;
else
return nfs_ok;
}
static int share_access_to_flags(u32 share_access)
{
return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
}
static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl,
stateid_t *s)
{
struct nfs4_stid *ret;
ret = find_stateid_by_type(cl, s, SC_TYPE_DELEG, SC_STATUS_REVOKED);
if (!ret)
return NULL;
return delegstateid(ret);
}
static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
{
return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
}
static __be32
nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
struct nfs4_delegation **dp)
{
int flags;
__be32 status = nfserr_bad_stateid;
struct nfs4_delegation *deleg;
deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
if (deleg == NULL)
goto out;
if (deleg->dl_stid.sc_status & SC_STATUS_ADMIN_REVOKED) {
nfs4_put_stid(&deleg->dl_stid);
status = nfserr_admin_revoked;
goto out;
}
if (deleg->dl_stid.sc_status & SC_STATUS_REVOKED) {
nfs4_put_stid(&deleg->dl_stid);
nfsd40_drop_revoked_stid(cl, &open->op_delegate_stateid);
status = nfserr_deleg_revoked;
goto out;
}
flags = share_access_to_flags(open->op_share_access);
status = nfs4_check_delegmode(deleg, flags);
if (status) {
nfs4_put_stid(&deleg->dl_stid);
goto out;
}
*dp = deleg;
out:
if (!nfsd4_is_deleg_cur(open))
return nfs_ok;
if (status)
return status;
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
return nfs_ok;
}
static inline int nfs4_access_to_access(u32 nfs4_access)
{
int flags = 0;
if (nfs4_access & NFS4_SHARE_ACCESS_READ)
flags |= NFSD_MAY_READ;
if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
flags |= NFSD_MAY_WRITE;
return flags;
}
static inline __be32
nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
struct nfsd4_open *open)
{
struct iattr iattr = {
.ia_valid = ATTR_SIZE,
.ia_size = 0,
};
struct nfsd_attrs attrs = {
.na_iattr = &iattr,
};
if (!open->op_truncate)
return 0;
if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
return nfserr_inval;
return nfsd_setattr(rqstp, fh, &attrs, NULL);
}
static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
struct nfsd4_open *open, bool new_stp)
{
struct nfsd_file *nf = NULL;
__be32 status;
int oflag = nfs4_access_to_omode(open->op_share_access);
int access = nfs4_access_to_access(open->op_share_access);
unsigned char old_access_bmap, old_deny_bmap;
spin_lock(&fp->fi_lock);
/*
* Are we trying to set a deny mode that would conflict with
* current access?
*/
status = nfs4_file_check_deny(fp, open->op_share_deny);
if (status != nfs_ok) {
if (status != nfserr_share_denied) {
spin_unlock(&fp->fi_lock);
goto out;
}
if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
stp, open->op_share_deny, false))
status = nfserr_jukebox;
spin_unlock(&fp->fi_lock);
goto out;
}
/* set access to the file */
status = nfs4_file_get_access(fp, open->op_share_access);
if (status != nfs_ok) {
if (status != nfserr_share_denied) {
spin_unlock(&fp->fi_lock);
goto out;
}
if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
stp, open->op_share_access, true))
status = nfserr_jukebox;
spin_unlock(&fp->fi_lock);
goto out;
}
/* Set access bits in stateid */
old_access_bmap = stp->st_access_bmap;
set_access(open->op_share_access, stp);
/* Set new deny mask */
old_deny_bmap = stp->st_deny_bmap;
set_deny(open->op_share_deny, stp);
fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
if (!fp->fi_fds[oflag]) {
spin_unlock(&fp->fi_lock);
status = nfsd_file_acquire_opened(rqstp, cur_fh, access,
open->op_filp, &nf);
if (status != nfs_ok)
goto out_put_access;
spin_lock(&fp->fi_lock);
if (!fp->fi_fds[oflag]) {
fp->fi_fds[oflag] = nf;
nf = NULL;
}
}
spin_unlock(&fp->fi_lock);
if (nf)
nfsd_file_put(nf);
status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
access));
if (status)
goto out_put_access;
status = nfsd4_truncate(rqstp, cur_fh, open);
if (status)
goto out_put_access;
out:
return status;
out_put_access:
stp->st_access_bmap = old_access_bmap;
nfs4_file_put_access(fp, open->op_share_access);
reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
goto out;
}
static __be32
nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
struct nfsd4_open *open)
{
__be32 status;
unsigned char old_deny_bmap = stp->st_deny_bmap;
if (!test_access(open->op_share_access, stp))
return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
/* test and set deny mode */
spin_lock(&fp->fi_lock);
status = nfs4_file_check_deny(fp, open->op_share_deny);
switch (status) {
case nfs_ok:
set_deny(open->op_share_deny, stp);
fp->fi_share_deny |=
(open->op_share_deny & NFS4_SHARE_DENY_BOTH);
break;
case nfserr_share_denied:
if (nfs4_resolve_deny_conflicts_locked(fp, false,
stp, open->op_share_deny, false))
status = nfserr_jukebox;
break;
}
spin_unlock(&fp->fi_lock);
if (status != nfs_ok)
return status;
status = nfsd4_truncate(rqstp, cur_fh, open);
if (status != nfs_ok)
reset_union_bmap_deny(old_deny_bmap, stp);
return status;
}
/* Should we give out recallable state?: */
static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
{
if (clp->cl_cb_state == NFSD4_CB_UP)
return true;
/*
* In the sessions case, since we don't have to establish a
* separate connection for callbacks, we assume it's OK
* until we hear otherwise:
*/
return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
}
static unsigned int
nfsd_notify_to_ignore(u32 notify)
{
unsigned int mask = 0;
if (notify & BIT(NOTIFY4_REMOVE_ENTRY))
mask |= FL_IGN_DIR_DELETE;
if (notify & BIT(NOTIFY4_ADD_ENTRY))
mask |= FL_IGN_DIR_CREATE;
if (notify & BIT(NOTIFY4_RENAME_ENTRY))
mask |= FL_IGN_DIR_RENAME;
return mask;
}
static struct file_lease *nfs4_alloc_init_lease(struct nfs4_delegation *dp, u32 notify)
{
struct file_lease *fl;
fl = locks_alloc_lease();
if (!fl)
return NULL;
fl->fl_lmops = &nfsd_lease_mng_ops;
fl->c.flc_flags = FL_DELEG | nfsd_notify_to_ignore(notify);
fl->c.flc_type = deleg_is_read(dp->dl_type) ? F_RDLCK : F_WRLCK;
fl->c.flc_owner = (fl_owner_t)dp;
fl->c.flc_pid = current->tgid;
fl->c.flc_file = rcu_dereference_protected(dp->dl_stid.sc_file->fi_deleg_file, 1)->nf_file;
return fl;
}
static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
struct nfs4_file *fp)
{
struct nfs4_ol_stateid *st;
struct file *f = rcu_dereference_protected(fp->fi_deleg_file, 1)->nf_file;
struct inode *ino = file_inode(f);
int writes;
writes = atomic_read(&ino->i_writecount);
if (!writes)
return 0;
/*
* There could be multiple filehandles (hence multiple
* nfs4_files) referencing this file, but that's not too
* common; let's just give up in that case rather than
* trying to go look up all the clients using that other
* nfs4_file as well:
*/
if (fp->fi_aliased)
return -EAGAIN;
/*
* If there's a close in progress, make sure that we see it
* clear any fi_fds[] entries before we see it decrement
* i_writecount:
*/
smp_mb__after_atomic();
if (fp->fi_fds[O_WRONLY])
writes--;
if (fp->fi_fds[O_RDWR])
writes--;
if (writes > 0)
return -EAGAIN; /* There may be non-NFSv4 writers */
/*
* It's possible there are non-NFSv4 write opens in progress,
* but if they haven't incremented i_writecount yet then they
* also haven't called break lease yet; so, they'll break this
* lease soon enough. So, all that's left to check for is NFSv4
* opens:
*/
spin_lock(&fp->fi_lock);
list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
if (st->st_openstp == NULL /* it's an open */ &&
access_permit_write(st) &&
st->st_stid.sc_client != clp) {
spin_unlock(&fp->fi_lock);
return -EAGAIN;
}
}
spin_unlock(&fp->fi_lock);
/*
* There's a small chance that we could be racing with another
* NFSv4 open. However, any open that hasn't added itself to
* the fi_stateids list also hasn't called break_lease yet; so,
* they'll break this lease soon enough.
*/
return 0;
}
/*
* It's possible that between opening the dentry and setting the delegation,
* that it has been renamed or unlinked. Redo the lookup to verify that this
* hasn't happened.
*/
static int
nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
struct svc_fh *parent)
{
struct svc_export *exp;
struct dentry *child;
__be32 err;
err = nfsd_lookup_dentry(open->op_rqstp, parent,
open->op_fname, open->op_fnamelen,
&exp, &child);
if (err)
return -EAGAIN;
exp_put(exp);
dput(child);
if (child != file_dentry(rcu_dereference_protected(fp->fi_deleg_file, 1)->nf_file))
return -EAGAIN;
return 0;
}
/*
* We avoid breaking delegations held by a client due to its own activity, but
* clearing setuid/setgid bits on a write is an implicit activity and the client
* may not notice and continue using the old mode. Avoid giving out a delegation
* on setuid/setgid files when the client is requesting an open for write.
*/
static int
nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf)
{
struct inode *inode = file_inode(nf->nf_file);
if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) &&
(inode->i_mode & (S_ISUID|S_ISGID)))
return -EAGAIN;
return 0;
}
/*
* Timestamp delegation was introduced in RFC7862. Runtime switch for disabling
* this feature is /sys/kernel/debug/nfsd/delegated_timestamps.
*/
static bool nfsd4_want_deleg_timestamps(const struct nfsd4_open *open)
{
if (!nfsd_delegts_enabled)
return false;
return open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS;
}
static struct nfs4_delegation *
nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
struct svc_fh *parent)
{
bool deleg_ts = nfsd4_want_deleg_timestamps(open);
struct nfs4_client *clp = stp->st_stid.sc_client;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfs4_file *fp = stp->st_stid.sc_file;
struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
struct nfs4_delegation *dp;
struct nfsd_file *nf = NULL;
struct file_lease *fl;
int status = 0;
u32 dl_type;
/*
* The fi_had_conflict and nfs_get_existing_delegation checks
* here are just optimizations; we'll need to recheck them at
* the end:
*/
if (fp->fi_had_conflict)
return ERR_PTR(-EAGAIN);
/*
* Try for a write delegation first. RFC8881 section 10.4 says:
*
* "An OPEN_DELEGATE_WRITE delegation allows the client to handle,
* on its own, all opens."
*
* Furthermore, section 9.1.2 says:
*
* "In the case of READ, the server may perform the corresponding
* check on the access mode, or it may choose to allow READ for
* OPEN4_SHARE_ACCESS_WRITE, to accommodate clients whose WRITE
* implementation may unavoidably do reads (e.g., due to buffer
* cache constraints)."
*
* We choose to offer a write delegation for OPEN with the
* OPEN4_SHARE_ACCESS_WRITE access mode to accommodate such clients.
*/
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
nf = find_writeable_file(fp);
dl_type = deleg_ts ? OPEN_DELEGATE_WRITE_ATTRS_DELEG : OPEN_DELEGATE_WRITE;
}
/*
* If the file is being opened O_RDONLY or we couldn't get a O_RDWR
* file for some reason, then try for a read delegation instead.
*/
if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) {
nf = find_readable_file(fp);
dl_type = deleg_ts ? OPEN_DELEGATE_READ_ATTRS_DELEG : OPEN_DELEGATE_READ;
}
if (!nf)
return ERR_PTR(-EAGAIN);
/*
* File delegations and associated locks cannot be recovered if the
* export is from an NFS proxy server.
*/
if (exportfs_cannot_lock(nf->nf_file->f_path.mnt->mnt_sb->s_export_op)) {
nfsd_file_put(nf);
return ERR_PTR(-EOPNOTSUPP);
}
spin_lock(&nn->deleg_lock);
spin_lock(&fp->fi_lock);
if (nfs4_delegation_exists(clp, fp))
status = -EAGAIN;
else if (nfsd4_verify_setuid_write(open, nf))
status = -EAGAIN;
else if (!rcu_dereference_protected(fp->fi_deleg_file,
lockdep_is_held(&fp->fi_lock))) {
rcu_assign_pointer(fp->fi_deleg_file, nf);
/* increment early to prevent fi_deleg_file from being
* cleared */
fp->fi_delegees = 1;
nf = NULL;
} else
fp->fi_delegees++;
spin_unlock(&fp->fi_lock);
spin_unlock(&nn->deleg_lock);
if (nf)
nfsd_file_put(nf);
if (status)
return ERR_PTR(status);
status = -ENOMEM;
dp = alloc_init_deleg(clp, fp, odstate, dl_type);
if (!dp)
goto out_delegees;
if (stp->st_stid.sc_export)
dp->dl_stid.sc_export = exp_get(stp->st_stid.sc_export);
fl = nfs4_alloc_init_lease(dp, 0);
if (!fl)
goto out_clnt_odstate;
status = kernel_setlease(rcu_dereference_protected(fp->fi_deleg_file, 1)->nf_file,
fl->c.flc_type, &fl, NULL);
if (fl)
locks_free_lease(fl);
if (status)
goto out_clnt_odstate;
if (parent) {
status = nfsd4_verify_deleg_dentry(open, fp, parent);
if (status)
goto out_unlock;
}
status = nfsd4_check_conflicting_opens(clp, fp);
if (status)
goto out_unlock;
/*
* Now that the deleg is set, check again to ensure that nothing
* raced in and changed the mode while we weren't looking.
*/
status = nfsd4_verify_setuid_write(open, rcu_dereference_protected(fp->fi_deleg_file, 1));
if (status)
goto out_unlock;
status = -EAGAIN;
if (fp->fi_had_conflict)
goto out_unlock;
spin_lock(&nn->deleg_lock);
spin_lock(&clp->cl_lock);
spin_lock(&fp->fi_lock);
status = hash_delegation_locked(dp, fp);
spin_unlock(&fp->fi_lock);
spin_unlock(&clp->cl_lock);
spin_unlock(&nn->deleg_lock);
if (status)
goto out_unlock;
return dp;
out_unlock:
kernel_setlease(rcu_dereference_protected(fp->fi_deleg_file, 1)->nf_file,
F_UNLCK, NULL, (void **)&dp);
out_clnt_odstate:
put_clnt_odstate(dp->dl_clnt_odstate);
nfs4_put_stid(&dp->dl_stid);
out_delegees:
put_deleg_file(fp);
return ERR_PTR(status);
}
static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
{
open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
if (status == -EAGAIN)
open->op_why_no_deleg = WND4_CONTENTION;
else {
open->op_why_no_deleg = WND4_RESOURCE;
switch (open->op_deleg_want) {
case OPEN4_SHARE_ACCESS_WANT_READ_DELEG:
case OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG:
case OPEN4_SHARE_ACCESS_WANT_ANY_DELEG:
break;
case OPEN4_SHARE_ACCESS_WANT_CANCEL:
open->op_why_no_deleg = WND4_CANCELLED;
break;
case OPEN4_SHARE_ACCESS_WANT_NO_DELEG:
WARN_ON_ONCE(1);
}
}
}
static bool
nfs4_delegation_stat(struct nfs4_delegation *dp, struct svc_fh *currentfh,
struct kstat *stat)
{
struct nfsd_file *nf = find_writeable_file(dp->dl_stid.sc_file);
struct path path;
int rc;
if (!nf)
return false;
path.mnt = currentfh->fh_export->ex_path.mnt;
path.dentry = file_dentry(nf->nf_file);
rc = vfs_getattr(&path, stat,
STATX_MODE | STATX_SIZE | STATX_ATIME |
STATX_MTIME | STATX_CTIME | STATX_CHANGE_COOKIE,
AT_STATX_SYNC_AS_STAT);
nfsd_file_put(nf);
return rc == 0;
}
/*
* Add NFS4_SHARE_ACCESS_READ to the write delegation granted on OPEN
* with NFS4_SHARE_ACCESS_WRITE by allocating separate nfsd_file and
* struct file to be used for read with delegation stateid.
*
*/
static bool
nfsd4_add_rdaccess_to_wrdeleg(struct svc_rqst *rqstp, struct nfsd4_open *open,
struct svc_fh *fh, struct nfs4_ol_stateid *stp)
{
struct nfs4_file *fp;
struct nfsd_file *nf = NULL;
if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) ==
NFS4_SHARE_ACCESS_WRITE) {
if (nfsd_file_acquire_opened(rqstp, fh, NFSD_MAY_READ, NULL, &nf))
return (false);
fp = stp->st_stid.sc_file;
spin_lock(&fp->fi_lock);
if (!fp->fi_fds[O_RDONLY]) {
__nfs4_file_get_access(fp, NFS4_SHARE_ACCESS_READ);
fp->fi_fds[O_RDONLY] = nf;
fp->fi_rdeleg_file = nfsd_file_get(fp->fi_fds[O_RDONLY]);
nf = NULL;
}
spin_unlock(&fp->fi_lock);
if (nf)
nfsd_file_put(nf);
}
return true;
}
/*
* The Linux NFS server does not offer write delegations to NFSv4.0
* clients in order to avoid conflicts between write delegations and
* GETATTRs requesting CHANGE or SIZE attributes.
*
* With NFSv4.1 and later minorversions, the SEQUENCE operation that
* begins each COMPOUND contains a client ID. Delegation recall can
* be avoided when the server recognizes the client sending a
* GETATTR also holds write delegation it conflicts with.
*
* However, the NFSv4.0 protocol does not enable a server to
* determine that a GETATTR originated from the client holding the
* conflicting delegation versus coming from some other client. Per
* RFC 7530 Section 16.7.5, the server must recall or send a
* CB_GETATTR even when the GETATTR originates from the client that
* holds the conflicting delegation.
*
* An NFSv4.0 client can trigger a pathological situation if it
* always sends a DELEGRETURN preceded by a conflicting GETATTR in
* the same COMPOUND. COMPOUND execution will always stop at the
* GETATTR and the DELEGRETURN will never get executed. The server
* eventually revokes the delegation, which can result in loss of
* open or lock state.
*/
static void
nfs4_open_delegation(struct svc_rqst *rqstp, struct nfsd4_open *open,
struct nfs4_ol_stateid *stp, struct svc_fh *currentfh,
struct svc_fh *fh)
{
struct nfs4_openowner *oo = openowner(stp->st_stateowner);
bool deleg_ts = nfsd4_want_deleg_timestamps(open);
struct nfs4_client *clp = stp->st_stid.sc_client;
struct svc_fh *parent = NULL;
struct nfs4_delegation *dp;
struct kstat stat;
int status = 0;
int cb_up;
cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
open->op_recall = false;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_PREVIOUS:
if (!cb_up)
open->op_recall = true;
break;
case NFS4_OPEN_CLAIM_NULL:
parent = currentfh;
fallthrough;
case NFS4_OPEN_CLAIM_FH:
/*
* Let's not give out any delegations till everyone's
* had the chance to reclaim theirs, *and* until
* NLM locks have all been reclaimed:
*/
if (locks_in_grace(clp->net))
goto out_no_deleg;
if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
goto out_no_deleg;
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE &&
!clp->cl_minorversion)
goto out_no_deleg;
break;
default:
goto out_no_deleg;
}
dp = nfs4_set_delegation(open, stp, parent);
if (IS_ERR(dp))
goto out_no_deleg;
memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
struct file *f;
f = rcu_dereference_protected(dp->dl_stid.sc_file->fi_deleg_file, 1)->nf_file;
if (!nfsd4_add_rdaccess_to_wrdeleg(rqstp, open, fh, stp) ||
!nfs4_delegation_stat(dp, currentfh, &stat)) {
nfs4_put_stid(&dp->dl_stid);
destroy_delegation(dp);
goto out_no_deleg;
}
open->op_delegate_type = deleg_ts ? OPEN_DELEGATE_WRITE_ATTRS_DELEG :
OPEN_DELEGATE_WRITE;
dp->dl_cb_fattr.ncf_initial_cinfo = nfsd4_change_attribute(&stat);
dp->dl_atime = stat.atime;
dp->dl_ctime = stat.ctime;
dp->dl_mtime = stat.mtime;
spin_lock(&f->f_lock);
if (deleg_ts)
f->f_mode |= FMODE_NOCMTIME;
spin_unlock(&f->f_lock);
trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid);
} else {
open->op_delegate_type = deleg_ts && nfs4_delegation_stat(dp, currentfh, &stat) ?
OPEN_DELEGATE_READ_ATTRS_DELEG : OPEN_DELEGATE_READ;
dp->dl_atime = stat.atime;
trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
}
nfs4_put_stid(&dp->dl_stid);
return;
out_no_deleg:
open->op_delegate_type = OPEN_DELEGATE_NONE;
/* 4.1 client asking for a delegation? */
if (open->op_deleg_want)
nfsd4_open_deleg_none_ext(open, status);
return;
}
static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
struct nfs4_delegation *dp)
{
if (deleg_is_write(dp->dl_type)) {
if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_READ_DELEG) {
open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
} else if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG) {
open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
}
}
/* Otherwise the client must be confused wanting a delegation
* it already has, therefore we don't return
* OPEN_DELEGATE_NONE_EXT and reason.
*/
}
/* Are we returning only a delegation stateid? */
static bool open_xor_delegation(struct nfsd4_open *open)
{
if (!(open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION))
return false;
/* Did we actually get a delegation? */
if (!deleg_is_read(open->op_delegate_type) && !deleg_is_write(open->op_delegate_type))
return false;
return true;
}
/**
* nfsd4_process_open2 - finish open processing
* @rqstp: the RPC transaction being executed
* @current_fh: NFSv4 COMPOUND's current filehandle
* @open: OPEN arguments
*
* If successful, (1) truncate the file if open->op_truncate was
* set, (2) set open->op_stateid, (3) set open->op_delegation.
*
* Returns %nfs_ok on success; otherwise an nfs4stat value in
* network byte order is returned.
*/
__be32
nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
struct nfs4_file *fp = NULL;
struct nfs4_ol_stateid *stp = NULL;
struct nfs4_delegation *dp = NULL;
__be32 status;
bool new_stp = false;
/*
* Lookup file; if found, lookup stateid and check open request,
* and check for delegations in the process of being recalled.
* If not found, create the nfs4_file struct
*/
fp = nfsd4_file_hash_insert(open->op_file, current_fh);
if (unlikely(!fp))
return nfserr_jukebox;
if (fp != open->op_file) {
status = nfs4_check_deleg(cl, open, &dp);
if (status)
goto out;
if (dp && nfsd4_is_deleg_cur(open) &&
(dp->dl_stid.sc_file != fp)) {
/*
* RFC8881 section 8.2.4 mandates the server to return
* NFS4ERR_BAD_STATEID if the selected table entry does
* not match the current filehandle. However returning
* NFS4ERR_BAD_STATEID in the OPEN can cause the client
* to repeatedly retry the operation with the same
* stateid, since the stateid itself is valid. To avoid
* this situation NFSD returns NFS4ERR_INVAL instead.
*/
status = nfserr_inval;
goto out;
}
stp = nfsd4_find_and_lock_existing_open(fp, open);
} else {
open->op_file = NULL;
status = nfserr_bad_stateid;
if (nfsd4_is_deleg_cur(open))
goto out;
}
if (!stp) {
stp = init_open_stateid(fp, open);
if (!stp) {
status = nfserr_jukebox;
goto out;
}
if (!open->op_stp) {
new_stp = true;
stp->st_stid.sc_export =
exp_get(current_fh->fh_export);
}
}
/*
* OPEN the file, or upgrade an existing OPEN.
* If truncate fails, the OPEN fails.
*
* stp is already locked.
*/
if (!new_stp) {
/* Stateid was found, this is an OPEN upgrade */
status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
if (status) {
mutex_unlock(&stp->st_mutex);
goto out;
}
} else {
status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
if (status) {
release_open_stateid(stp);
mutex_unlock(&stp->st_mutex);
goto out;
}
stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
open->op_odstate);
if (stp->st_clnt_odstate == open->op_odstate)
open->op_odstate = NULL;
}
nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
mutex_unlock(&stp->st_mutex);
if (nfsd4_has_session(&resp->cstate)) {
if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_NO_DELEG) {
open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
open->op_why_no_deleg = WND4_NOT_WANTED;
goto nodeleg;
}
}
/*
* Attempt to hand out a delegation. No error return, because the
* OPEN succeeds even if we fail.
*/
nfs4_open_delegation(rqstp, open, stp,
&resp->cstate.current_fh, current_fh);
/*
* If there is an existing open stateid, it must be updated and
* returned. Only respect WANT_OPEN_XOR_DELEGATION when a new
* open stateid would have to be created.
*/
if (new_stp && open_xor_delegation(open)) {
memcpy(&open->op_stateid, &zero_stateid, sizeof(open->op_stateid));
open->op_rflags |= OPEN4_RESULT_NO_OPEN_STATEID;
release_open_stateid(stp);
}
nodeleg:
status = nfs_ok;
trace_nfsd_open(&stp->st_stid.sc_stateid);
out:
/* 4.1 client trying to upgrade/downgrade delegation? */
if (open->op_delegate_type == OPEN_DELEGATE_NONE && dp &&
open->op_deleg_want)
nfsd4_deleg_xgrade_none_ext(open, dp);
if (fp)
put_nfs4_file(fp);
if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
/*
* To finish the open response, we just need to set the rflags.
*/
open->op_rflags |= NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
if (nfsd4_has_session(&resp->cstate))
open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
if (dp)
nfs4_put_stid(&dp->dl_stid);
if (stp)
nfs4_put_stid(&stp->st_stid);
return status;
}
void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
struct nfsd4_open *open)
{
if (open->op_openowner)
nfs4_put_stateowner(&open->op_openowner->oo_owner);
if (open->op_file)
kmem_cache_free(file_slab, open->op_file);
if (open->op_stp)
nfs4_put_stid(&open->op_stp->st_stid);
if (open->op_odstate)
kmem_cache_free(odstate_slab, open->op_odstate);
}
__be32
nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
clientid_t *clid = &u->renew;
struct nfs4_client *clp;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
trace_nfsd_clid_renew(clid);
status = set_client(clid, cstate, nn);
if (status)
return status;
clp = cstate->clp;
if (!list_empty(&clp->cl_delegations)
&& clp->cl_cb_state != NFSD4_CB_UP)
return nfserr_cb_path_down;
return nfs_ok;
}
static void
nfsd4_end_grace(struct nfsd_net *nn)
{
/*
* nfsd4_end_grace() can be entered concurrently from the
* laundromat workqueue and from an nfsd compound thread
* handling RECLAIM_COMPLETE. Without serialization, both
* callers can observe NFSD_NET_GRACE_ENDED clear and proceed
* into nfsd4_record_grace_done(). For tracking ops whose
* grace_done drains reclaim_str_hashtbl, that results in
* list corruption and a double free of every
* nfs4_client_reclaim entry. Use an atomic test-and-set so
* exactly one caller proceeds.
*/
if (test_and_set_bit(NFSD_NET_GRACE_ENDED, &nn->flags))
return;
trace_nfsd_grace_complete(nn);
/*
* If the server goes down again right now, an NFSv4
* client will still be allowed to reclaim after it comes back up,
* even if it hasn't yet had a chance to reclaim state this time.
*
*/
nfsd4_record_grace_done(nn);
/*
* At this point, NFSv4 clients can still reclaim. But if the
* server crashes, any that have not yet reclaimed will be out
* of luck on the next boot.
*
* (NFSv4.1+ clients are considered to have reclaimed once they
* call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
* have reclaimed after their first OPEN.)
*/
locks_end_grace(&nn->nfsd4_manager);
/*
* At this point, and once lockd and/or any other containers
* exit their grace period, further reclaims will fail and
* regular locking can resume.
*/
}
/**
* nfsd4_force_end_grace - forcibly end the NFSv4 grace period
* @nn: network namespace for the server instance to be updated
*
* Forces bypass of normal grace period completion, then schedules
* the laundromat to end the grace period immediately. Does not wait
* for the grace period to fully terminate before returning.
*
* Return values:
* %true: Grace termination schedule
* %false: No action was taken
*/
bool nfsd4_force_end_grace(struct nfsd_net *nn)
{
if (!nn->client_tracking_ops)
return false;
if (test_bit(NFSD_NET_GRACE_ENDED, &nn->flags))
return false;
/* laundromat_work must be initialised now, though it might be disabled */
set_bit(NFSD_NET_GRACE_END_FORCED, &nn->flags);
/* mod_delayed_work() doesn't queue work after
* nfs4_state_shutdown_net() has called disable_delayed_work_sync()
*/
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
return true;
}
/*
* If we've waited a lease period but there are still clients trying to
* reclaim, wait a little longer to give them a chance to finish.
*/
static bool clients_still_reclaiming(struct nfsd_net *nn)
{
time64_t double_grace_period_end = nn->boot_time_bt +
2 * nn->nfsd4_lease;
if (test_bit(NFSD_NET_GRACE_END_FORCED, &nn->flags))
return false;
if (test_bit(NFSD_NET_TRACK_RECLAIM_COMPLETES, &nn->flags)) {
int size;
down_read(&nn->reclaim_str_hashtbl_lock);
size = nn->reclaim_str_hashtbl_size;
up_read(&nn->reclaim_str_hashtbl_lock);
if (atomic_read(&nn->nr_reclaim_complete) == size)
return false;
}
if (!test_and_clear_bit(NFSD_NET_SOMEBODY_RECLAIMED, &nn->flags))
return false;
/*
* If we've given them *two* lease times to reclaim, and they're
* still not done, give up:
*/
if (ktime_get_boottime_seconds() > double_grace_period_end)
return false;
return true;
}
struct laundry_time {
time64_t cutoff;
time64_t new_timeo;
};
static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
{
time64_t time_remaining;
if (last_refresh < lt->cutoff)
return true;
time_remaining = last_refresh - lt->cutoff;
lt->new_timeo = min(lt->new_timeo, time_remaining);
return false;
}
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
{
spin_lock_init(&nn->nfsd_ssc_lock);
INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
init_waitqueue_head(&nn->nfsd_ssc_waitq);
}
/*
* This is called when nfsd is being shutdown, after all inter_ssc
* cleanup were done, to destroy the ssc delayed unmount list.
*/
static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
{
struct nfsd4_ssc_umount_item *ni = NULL;
struct nfsd4_ssc_umount_item *tmp;
spin_lock(&nn->nfsd_ssc_lock);
list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
list_del(&ni->nsui_list);
spin_unlock(&nn->nfsd_ssc_lock);
mntput(ni->nsui_vfsmount);
kfree(ni);
spin_lock(&nn->nfsd_ssc_lock);
}
spin_unlock(&nn->nfsd_ssc_lock);
}
static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
{
bool do_wakeup = false;
struct nfsd4_ssc_umount_item *ni;
restart:
spin_lock(&nn->nfsd_ssc_lock);
list_for_each_entry(ni, &nn->nfsd_ssc_mount_list, nsui_list) {
if (!time_after(jiffies, ni->nsui_expire))
break;
if (refcount_read(&ni->nsui_refcnt) > 1)
continue;
/* Prevent concurrent setup during unmount */
ni->nsui_busy = true;
spin_unlock(&nn->nfsd_ssc_lock);
mntput(ni->nsui_vfsmount);
spin_lock(&nn->nfsd_ssc_lock);
/* Force concurrent scanners to restart */
list_del(&ni->nsui_list);
kfree(ni);
/* wakeup ssc_connect waiters */
do_wakeup = true;
/*
* Concurrent nfsd4_ssc_cancel_dul() can free any item
* on the list under nfsd_ssc_lock while mntput() runs
* above. Restart from the head; the list is short and
* the expire worker is periodic, so this is cheap.
*/
spin_unlock(&nn->nfsd_ssc_lock);
goto restart;
}
if (do_wakeup)
wake_up_all(&nn->nfsd_ssc_waitq);
spin_unlock(&nn->nfsd_ssc_lock);
}
#endif
/* Check if any lock belonging to this lockowner has any blockers */
static bool
nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
{
struct file_lock_context *ctx;
struct nfs4_ol_stateid *stp;
struct nfs4_file *nf;
list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
nf = stp->st_stid.sc_file;
ctx = locks_inode_context(nf->fi_inode);
if (!ctx)
continue;
if (locks_owner_has_blockers(ctx, lo))
return true;
}
return false;
}
static bool
nfs4_anylock_blockers(struct nfs4_client *clp)
{
int i;
struct nfs4_stateowner *so;
struct nfs4_lockowner *lo;
if (atomic_read(&clp->cl_delegs_in_recall))
return true;
spin_lock(&clp->cl_lock);
for (i = 0; i < OWNER_HASH_SIZE; i++) {
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
so_strhash) {
if (so->so_is_open_owner)
continue;
lo = lockowner(so);
if (nfs4_lockowner_has_blockers(lo)) {
spin_unlock(&clp->cl_lock);
return true;
}
}
}
spin_unlock(&clp->cl_lock);
return false;
}
static void
nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
struct laundry_time *lt)
{
unsigned int maxreap, reapcnt = 0;
struct list_head *pos, *next;
struct nfs4_client *clp;
maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
INIT_LIST_HEAD(reaplist);
spin_lock(&nn->client_lock);
list_for_each_safe(pos, next, &nn->client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (clp->cl_state == NFSD4_EXPIRABLE)
goto exp_client;
if (!state_expired(lt, clp->cl_time))
break;
if (!atomic_read(&clp->cl_rpc_users)) {
if (clp->cl_state == NFSD4_ACTIVE)
atomic_inc(&nn->nfsd_courtesy_clients);
clp->cl_state = NFSD4_COURTESY;
}
if (!client_has_state(clp))
goto exp_client;
if (!nfs4_anylock_blockers(clp))
if (reapcnt >= maxreap)
continue;
exp_client:
if (!mark_client_expired_locked(clp)) {
list_add(&clp->cl_lru, reaplist);
reapcnt++;
}
}
spin_unlock(&nn->client_lock);
}
static void
nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
struct list_head *reaplist)
{
unsigned int maxreap = 0, reapcnt = 0;
struct list_head *pos, *next;
struct nfs4_client *clp;
maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
INIT_LIST_HEAD(reaplist);
spin_lock(&nn->client_lock);
list_for_each_safe(pos, next, &nn->client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (clp->cl_state == NFSD4_ACTIVE)
break;
if (reapcnt >= maxreap)
break;
if (!mark_client_expired_locked(clp)) {
list_add(&clp->cl_lru, reaplist);
reapcnt++;
}
}
spin_unlock(&nn->client_lock);
}
static void
nfs4_process_client_reaplist(struct list_head *reaplist)
{
struct list_head *pos, *next;
struct nfs4_client *clp;
list_for_each_safe(pos, next, reaplist) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
trace_nfsd_clid_purged(&clp->cl_clientid);
list_del_init(&clp->cl_lru);
expire_client(clp);
}
}
static void nfs40_clean_admin_revoked(struct nfsd_net *nn,
struct laundry_time *lt)
{
struct nfs4_client *clp;
spin_lock(&nn->client_lock);
if (nn->nfs40_last_revoke == 0 ||
nn->nfs40_last_revoke > lt->cutoff) {
spin_unlock(&nn->client_lock);
return;
}
nn->nfs40_last_revoke = 0;
retry:
list_for_each_entry(clp, &nn->client_lru, cl_lru) {
unsigned long id, tmp;
struct nfs4_stid *stid;
if (atomic_read(&clp->cl_admin_revoked) == 0)
continue;
if (is_client_expired(clp))
continue;
spin_lock(&clp->cl_lock);
idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
refcount_inc(&stid->sc_count);
atomic_inc(&clp->cl_rpc_users);
spin_unlock(&nn->client_lock);
/* this function drops ->cl_lock */
nfsd4_drop_revoked_stid(stid);
nfs4_put_stid(stid);
spin_lock(&nn->client_lock);
put_client_no_renew_locked(clp);
goto retry;
}
spin_unlock(&clp->cl_lock);
}
spin_unlock(&nn->client_lock);
}
static time64_t
nfs4_laundromat(struct nfsd_net *nn)
{
struct nfs4_openowner *oo;
struct nfs4_delegation *dp;
struct nfs4_ol_stateid *stp;
struct nfsd4_blocked_lock *nbl;
struct list_head *pos, *next, reaplist;
struct laundry_time lt = {
.cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
.new_timeo = nn->nfsd4_lease
};
struct nfs4_cpntf_state *cps;
struct nfs4_client *clp;
copy_stateid_t *cps_t;
int i;
if (clients_still_reclaiming(nn)) {
lt.new_timeo = 0;
goto out;
}
nfsd4_end_grace(nn);
spin_lock(&nn->s2s_cp_lock);
/* s2s_cp_stateids holds only COPY_NOTIFY stateids */
idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
if (state_expired(<, cps->cpntf_time))
revoke_cpntf_state_locked(nn, cps);
}
spin_unlock(&nn->s2s_cp_lock);
nfsd4_async_copy_reaper(nn);
nfs4_get_client_reaplist(nn, &reaplist, <);
nfs4_process_client_reaplist(&reaplist);
nfs40_clean_admin_revoked(nn, <);
spin_lock(&nn->deleg_lock);
list_for_each_safe(pos, next, &nn->del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
if (!state_expired(<, dp->dl_time))
break;
clp = dp->dl_stid.sc_client;
spin_lock(&nn->client_lock);
if (is_client_expired(clp)) {
spin_unlock(&nn->client_lock);
continue;
}
/*
* Pin without reviving: get_client_locked() would
* flip a courtesy client back to NFSD4_ACTIVE.
*/
atomic_inc(&clp->cl_rpc_users);
spin_unlock(&nn->client_lock);
refcount_inc(&dp->dl_stid.sc_count);
unhash_delegation_locked(dp, SC_STATUS_REVOKED);
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&nn->deleg_lock);
while (!list_empty(&reaplist)) {
dp = list_first_entry(&reaplist, struct nfs4_delegation,
dl_recall_lru);
clp = dp->dl_stid.sc_client;
list_del_init(&dp->dl_recall_lru);
revoke_delegation(dp);
put_client_no_renew(clp);
}
spin_lock(&nn->client_lock);
while (!list_empty(&nn->close_lru)) {
oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
oo_close_lru);
if (!state_expired(<, oo->oo_time))
break;
list_del_init(&oo->oo_close_lru);
clp = oo->oo_owner.so_client;
if (is_client_expired(clp))
continue;
stp = oo->oo_last_closed_stid;
oo->oo_last_closed_stid = NULL;
atomic_inc(&clp->cl_rpc_users);
spin_unlock(&nn->client_lock);
nfs4_put_stid(&stp->st_stid);
spin_lock(&nn->client_lock);
put_client_no_renew_locked(clp);
}
spin_unlock(&nn->client_lock);
/*
* It's possible for a client to try and acquire an already held lock
* that is being held for a long time, and then lose interest in it.
* So, we clean out any un-revisited request after a lease period
* under the assumption that the client is no longer interested.
*
* RFC5661, sec. 9.6 states that the client must not rely on getting
* notifications and must continue to poll for locks, even when the
* server supports them. Thus this shouldn't lead to clients blocking
* indefinitely once the lock does become free.
*/
BUG_ON(!list_empty(&reaplist));
spin_lock(&nn->client_lock);
spin_lock(&nn->blocked_locks_lock);
list_for_each_safe(pos, next, &nn->blocked_locks_lru) {
nbl = list_entry(pos, struct nfsd4_blocked_lock, nbl_lru);
if (!state_expired(<, nbl->nbl_time))
break;
clp = nbl_client(nbl);
if (is_client_expired(clp))
continue;
atomic_inc(&clp->cl_rpc_users);
list_move(&nbl->nbl_lru, &reaplist);
list_del_init(&nbl->nbl_list);
}
spin_unlock(&nn->blocked_locks_lock);
spin_unlock(&nn->client_lock);
while (!list_empty(&reaplist)) {
nbl = list_first_entry(&reaplist,
struct nfsd4_blocked_lock, nbl_lru);
clp = nbl_client(nbl);
list_del_init(&nbl->nbl_lru);
free_blocked_lock(nbl);
put_client_no_renew(clp);
}
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
/* service the server-to-server copy delayed unmount list */
nfsd4_ssc_expire_umount(nn);
#endif
if (atomic_long_read(&num_delegations) >= max_delegations)
deleg_reaper(nn);
out:
return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
}
static void laundromat_main(struct work_struct *);
static void
laundromat_main(struct work_struct *laundry)
{
time64_t t;
struct delayed_work *dwork = to_delayed_work(laundry);
struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
laundromat_work);
t = nfs4_laundromat(nn);
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
}
static void
courtesy_client_reaper(struct nfsd_net *nn)
{
struct list_head reaplist;
nfs4_get_courtesy_client_reaplist(nn, &reaplist);
nfs4_process_client_reaplist(&reaplist);
}
static void
deleg_reaper(struct nfsd_net *nn)
{
struct list_head *pos, *next;
struct nfs4_client *clp;
spin_lock(&nn->client_lock);
list_for_each_safe(pos, next, &nn->client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (clp->cl_state != NFSD4_ACTIVE)
continue;
if (list_empty(&clp->cl_delegations))
continue;
if (atomic_read(&clp->cl_delegs_in_recall))
continue;
if (ktime_get_boottime_seconds() - clp->cl_ra_time < 5)
continue;
if (clp->cl_cb_state != NFSD4_CB_UP)
continue;
if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &clp->cl_ra->ra_cb.cb_flags))
continue;
/* release in nfsd4_cb_recall_any_release */
kref_get(&clp->cl_nfsdfs.cl_ref);
clp->cl_ra_time = ktime_get_boottime_seconds();
clp->cl_ra->ra_keep = 0;
clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG) |
BIT(RCA4_TYPE_MASK_WDATA_DLG);
trace_nfsd_cb_recall_any(clp->cl_ra);
nfsd4_run_cb(&clp->cl_ra->ra_cb);
}
spin_unlock(&nn->client_lock);
}
static void
nfsd4_state_shrinker_worker(struct work_struct *work)
{
struct nfsd_net *nn = container_of(work, struct nfsd_net,
nfsd_shrinker_work);
courtesy_client_reaper(nn);
deleg_reaper(nn);
}
static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
{
if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
return nfserr_bad_stateid;
return nfs_ok;
}
static
__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
{
__be32 status = nfserr_openmode;
/* For lock stateid's, we test the parent open, not the lock: */
if (stp->st_openstp)
stp = stp->st_openstp;
if ((flags & WR_STATE) && !access_permit_write(stp))
goto out;
if ((flags & RD_STATE) && !access_permit_read(stp))
goto out;
status = nfs_ok;
out:
return status;
}
static inline __be32
check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
{
if (ONE_STATEID(stateid) && (flags & RD_STATE))
return nfs_ok;
else if (opens_in_grace(net)) {
/* Answer in remaining cases depends on existence of
* conflicting state; so we must wait out the grace period. */
return nfserr_grace;
} else if (flags & WR_STATE)
return nfs4_share_conflict(current_fh,
NFS4_SHARE_DENY_WRITE);
else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
return nfs4_share_conflict(current_fh,
NFS4_SHARE_DENY_READ);
}
static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
{
/*
* When sessions are used the stateid generation number is ignored
* when it is zero.
*/
if (has_session && in->si_generation == 0)
return nfs_ok;
if (in->si_generation == ref->si_generation)
return nfs_ok;
/* If the client sends us a stateid from the future, it's buggy: */
if (nfsd4_stateid_generation_after(in, ref))
return nfserr_bad_stateid;
/*
* However, we could see a stateid from the past, even from a
* non-buggy client. For example, if the client sends a lock
* while some IO is outstanding, the lock may bump si_generation
* while the IO is still in flight. The client could avoid that
* situation by waiting for responses on all the IO requests,
* but better performance may result in retrying IO that
* receives an old_stateid error if requests are rarely
* reordered in flight:
*/
return nfserr_old_stateid;
}
static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
{
__be32 ret;
spin_lock(&s->sc_lock);
ret = nfsd4_verify_open_stid(s);
if (ret == nfs_ok)
ret = check_stateid_generation(in, &s->sc_stateid, has_session);
spin_unlock(&s->sc_lock);
if (ret == nfserr_admin_revoked)
nfsd40_drop_revoked_stid(s->sc_client,
&s->sc_stateid);
return ret;
}
static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
{
if (ols->st_stateowner->so_is_open_owner &&
!(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
return nfserr_bad_stateid;
return nfs_ok;
}
static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
{
struct nfs4_stid *s;
__be32 status = nfserr_bad_stateid;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
CLOSE_STATEID(stateid))
return status;
spin_lock(&cl->cl_lock);
s = find_stateid_locked(cl, stateid);
if (!s)
goto out_unlock;
status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
if (status)
goto out_unlock;
status = nfsd4_verify_open_stid(s);
if (status)
goto out_unlock;
switch (s->sc_type) {
case SC_TYPE_DELEG:
status = nfs_ok;
break;
case SC_TYPE_OPEN:
case SC_TYPE_LOCK:
status = nfsd4_check_openowner_confirmed(openlockstateid(s));
break;
default:
printk("unknown stateid type %x\n", s->sc_type);
status = nfserr_bad_stateid;
}
out_unlock:
spin_unlock(&cl->cl_lock);
if (status == nfserr_admin_revoked)
nfsd40_drop_revoked_stid(cl, stateid);
return status;
}
__be32
nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
stateid_t *stateid,
unsigned short typemask, unsigned short statusmask,
struct nfs4_stid **s, struct nfsd_net *nn)
{
__be32 status;
struct nfs4_stid *stid;
bool return_revoked = false;
/*
* only return revoked delegations if explicitly asked.
* otherwise we report revoked or bad_stateid status.
*/
if (statusmask & SC_STATUS_REVOKED)
return_revoked = true;
if (typemask & SC_TYPE_DELEG)
/* Always allow REVOKED for DELEG so we can
* return the appropriate error.
*/
statusmask |= SC_STATUS_REVOKED;
statusmask |= SC_STATUS_ADMIN_REVOKED | SC_STATUS_FREEABLE;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
CLOSE_STATEID(stateid))
return nfserr_bad_stateid;
status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
if (status == nfserr_stale_clientid) {
if (cstate->session)
return nfserr_bad_stateid;
return nfserr_stale_stateid;
}
if (status)
return status;
stid = find_stateid_by_type(cstate->clp, stateid, typemask, statusmask);
if (!stid)
return nfserr_bad_stateid;
if ((stid->sc_status & SC_STATUS_REVOKED) && !return_revoked) {
nfs4_put_stid(stid);
return nfserr_deleg_revoked;
}
if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
nfsd40_drop_revoked_stid(cstate->clp, stateid);
nfs4_put_stid(stid);
return nfserr_admin_revoked;
}
*s = stid;
return nfs_ok;
}
static struct nfsd_file *
nfs4_find_file(struct nfs4_stid *s, int flags)
{
struct nfsd_file *ret = NULL;
if (!s || s->sc_status)
return NULL;
switch (s->sc_type) {
case SC_TYPE_DELEG:
case SC_TYPE_OPEN:
case SC_TYPE_LOCK:
if (flags & RD_STATE)
ret = find_readable_file(s->sc_file);
else
ret = find_writeable_file(s->sc_file);
}
return ret;
}
static __be32
nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
{
__be32 status;
status = nfsd4_check_openowner_confirmed(ols);
if (status)
return status;
return nfs4_check_openmode(ols, flags);
}
static __be32
nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
struct nfsd_file **nfp, int flags)
{
int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
struct nfsd_file *nf;
__be32 status;
nf = nfs4_find_file(s, flags);
if (nf) {
status = nfsd_permission(&rqstp->rq_cred,
fhp->fh_export, fhp->fh_dentry,
acc | NFSD_MAY_OWNER_OVERRIDE);
if (status) {
nfsd_file_put(nf);
goto out;
}
} else {
status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
if (status)
return status;
}
*nfp = nf;
out:
return status;
}
static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
{
WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
if (refcount_dec_and_test(&cps->cp_stateid.cs_count)) {
nfsd4_unhash_cpntf_state(nn, cps);
kfree(cps);
}
}
/*
* A READ from an inter server to server COPY will have a
* copy stateid. Look up the copy notify stateid from the
* idr structure and take a reference on it.
*/
__be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
struct nfs4_client *clp,
struct nfs4_cpntf_state **cps)
{
copy_stateid_t *cps_t;
struct nfs4_cpntf_state *state = NULL;
if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
return nfserr_bad_stateid;
spin_lock(&nn->s2s_cp_lock);
/* s2s_cp_stateids holds only COPY_NOTIFY stateids */
cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
if (cps_t) {
state = container_of(cps_t, struct nfs4_cpntf_state,
cp_stateid);
if (!clp) {
refcount_inc(&state->cp_stateid.cs_count);
} else if (memcmp(&clp->cl_clientid, &state->cp_p_clid,
sizeof(clientid_t))) {
/*
* OFFLOAD_CANCEL: only the creating client may cancel.
* so_id is guessable, so without this check any client
* could free another's cpntf state.
*/
state = NULL;
goto unlock;
} else {
revoke_cpntf_state_locked(nn, state);
}
}
unlock:
spin_unlock(&nn->s2s_cp_lock);
if (!state)
return nfserr_bad_stateid;
if (!clp)
*cps = state;
return 0;
}
static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
struct nfs4_stid **stid)
{
__be32 status;
struct nfs4_cpntf_state *cps = NULL;
struct nfs4_client *found;
status = manage_cpntf_state(nn, st, NULL, &cps);
if (status)
return status;
cps->cpntf_time = ktime_get_boottime_seconds();
status = nfserr_expired;
found = lookup_clientid(&cps->cp_p_clid, true, nn);
if (!found)
goto out;
*stid = find_stateid_by_type(found, &cps->cp_p_stateid,
SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
0);
if (*stid)
status = nfs_ok;
else
status = nfserr_bad_stateid;
put_client_renew(found);
out:
nfs4_put_cpntf_state(nn, cps);
return status;
}
void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
{
spin_lock(&nn->s2s_cp_lock);
_free_cpntf_state_locked(nn, cps);
spin_unlock(&nn->s2s_cp_lock);
}
/**
* nfs4_preprocess_stateid_op - find and prep stateid for an operation
* @rqstp: incoming request from client
* @cstate: current compound state
* @fhp: filehandle associated with requested stateid
* @stateid: stateid (provided by client)
* @flags: flags describing type of operation to be done
* @nfp: optional nfsd_file return pointer (may be NULL)
* @cstid: optional returned nfs4_stid pointer (may be NULL)
*
* Given info from the client, look up a nfs4_stid for the operation. On
* success, it returns a reference to the nfs4_stid and/or the nfsd_file
* associated with it.
*/
__be32
nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
stateid_t *stateid, int flags, struct nfsd_file **nfp,
struct nfs4_stid **cstid)
{
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct nfs4_stid *s = NULL;
__be32 status;
if (nfp)
*nfp = NULL;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
status = check_special_stateids(net, fhp, stateid, flags);
goto done;
}
status = nfsd4_lookup_stateid(cstate, stateid,
SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
0, &s, nn);
if (status == nfserr_bad_stateid)
status = find_cpntf_state(nn, stateid, &s);
if (status)
return status;
status = nfsd4_stid_check_stateid_generation(stateid, s,
nfsd4_has_session(cstate));
if (status)
goto out;
switch (s->sc_type) {
case SC_TYPE_DELEG:
status = nfs4_check_delegmode(delegstateid(s), flags);
break;
case SC_TYPE_OPEN:
case SC_TYPE_LOCK:
status = nfs4_check_olstateid(openlockstateid(s), flags);
break;
}
if (status)
goto out;
status = nfs4_check_fh(fhp, s);
done:
if (status == nfs_ok && nfp)
status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
out:
if (s) {
if (!status && cstid)
*cstid = s;
else
nfs4_put_stid(s);
}
return status;
}
/*
* Test if the stateid is valid
*/
__be32
nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
struct nfsd4_test_stateid_id *stateid;
struct nfs4_client *cl = cstate->clp;
list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
stateid->ts_id_status =
nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
return nfs_ok;
}
static __be32
nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
{
struct nfs4_ol_stateid *stp = openlockstateid(s);
__be32 ret;
ret = nfsd4_lock_ol_stateid(stp);
if (ret)
goto out_put_stid;
ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
if (ret)
goto out;
ret = nfserr_locks_held;
if (check_for_locks(stp->st_stid.sc_file,
lockowner(stp->st_stateowner)))
goto out;
release_lock_stateid(stp);
ret = nfs_ok;
out:
mutex_unlock(&stp->st_mutex);
out_put_stid:
nfs4_put_stid(s);
return ret;
}
__be32
nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
stateid_t *stateid = &free_stateid->fr_stateid;
struct nfs4_stid *s;
struct nfs4_delegation *dp;
struct nfs4_client *cl = cstate->clp;
__be32 ret = nfserr_bad_stateid;
spin_lock(&cl->cl_lock);
s = find_stateid_locked(cl, stateid);
if (!s || s->sc_status & SC_STATUS_CLOSED)
goto out_unlock;
if (s->sc_status & SC_STATUS_ADMIN_REVOKED) {
nfsd4_drop_revoked_stid(s);
ret = nfs_ok;
goto out;
}
spin_lock(&s->sc_lock);
switch (s->sc_type) {
case SC_TYPE_DELEG:
if (s->sc_status & SC_STATUS_REVOKED) {
s->sc_status |= SC_STATUS_CLOSED;
spin_unlock(&s->sc_lock);
dp = delegstateid(s);
if (s->sc_status & SC_STATUS_FREEABLE)
list_del_init(&dp->dl_recall_lru);
s->sc_status |= SC_STATUS_FREED;
spin_unlock(&cl->cl_lock);
nfs4_put_stid(s);
ret = nfs_ok;
goto out;
}
ret = nfserr_locks_held;
break;
case SC_TYPE_OPEN:
ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
if (ret)
break;
ret = nfserr_locks_held;
break;
case SC_TYPE_LOCK:
spin_unlock(&s->sc_lock);
refcount_inc(&s->sc_count);
spin_unlock(&cl->cl_lock);
ret = nfsd4_free_lock_stateid(stateid, s);
goto out;
}
spin_unlock(&s->sc_lock);
out_unlock:
spin_unlock(&cl->cl_lock);
out:
return ret;
}
static inline int
setlkflg (int type)
{
return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
RD_STATE : WR_STATE;
}
static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
{
struct svc_fh *current_fh = &cstate->current_fh;
struct nfs4_stateowner *sop = stp->st_stateowner;
__be32 status;
status = nfsd4_check_seqid(cstate, sop, seqid);
if (status)
return status;
status = nfsd4_lock_ol_stateid(stp);
if (status != nfs_ok)
return status;
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
if (status == nfs_ok)
status = nfs4_check_fh(current_fh, &stp->st_stid);
if (status != nfs_ok)
mutex_unlock(&stp->st_mutex);
return status;
}
/**
* nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op
* @cstate: compund state
* @seqid: seqid (provided by client)
* @stateid: stateid (provided by client)
* @typemask: mask of allowable types for this operation
* @statusmask: mask of allowed states: 0 or STID_CLOSED
* @stpp: return pointer for the stateid found
* @nn: net namespace for request
*
* Given a stateid+seqid from a client, look up an nfs4_ol_stateid and
* return it in @stpp. On a nfs_ok return, the returned stateid will
* have its st_mutex locked.
*/
static __be32
nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
stateid_t *stateid,
unsigned short typemask, unsigned short statusmask,
struct nfs4_ol_stateid **stpp,
struct nfsd_net *nn)
{
__be32 status;
struct nfs4_stid *s;
struct nfs4_ol_stateid *stp = NULL;
trace_nfsd_preprocess(seqid, stateid);
*stpp = NULL;
retry:
status = nfsd4_lookup_stateid(cstate, stateid,
typemask, statusmask, &s, nn);
if (status)
return status;
stp = openlockstateid(s);
if (nfsd4_cstate_assign_replay(cstate, stp->st_stateowner) == -EAGAIN) {
nfs4_put_stid(&stp->st_stid);
goto retry;
}
status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
if (!status)
*stpp = stp;
else
nfs4_put_stid(&stp->st_stid);
return status;
}
static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
{
__be32 status;
struct nfs4_openowner *oo;
struct nfs4_ol_stateid *stp;
status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
SC_TYPE_OPEN, 0, &stp, nn);
if (status)
return status;
oo = openowner(stp->st_stateowner);
if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
mutex_unlock(&stp->st_mutex);
nfs4_put_stid(&stp->st_stid);
return nfserr_bad_stateid;
}
*stpp = stp;
return nfs_ok;
}
__be32
nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_open_confirm *oc = &u->open_confirm;
__be32 status;
struct nfs4_openowner *oo;
struct nfs4_ol_stateid *stp;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
cstate->current_fh.fh_dentry);
status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
if (status)
return status;
status = nfs4_preprocess_seqid_op(cstate,
oc->oc_seqid, &oc->oc_req_stateid,
SC_TYPE_OPEN, 0, &stp, nn);
if (status)
goto out;
oo = openowner(stp->st_stateowner);
status = nfserr_bad_stateid;
if (oo->oo_flags & NFS4_OO_CONFIRMED) {
mutex_unlock(&stp->st_mutex);
goto put_stateid;
}
oo->oo_flags |= NFS4_OO_CONFIRMED;
nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
mutex_unlock(&stp->st_mutex);
trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
nfsd4_client_record_create(oo->oo_owner.so_client);
status = nfs_ok;
put_stateid:
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
return status;
}
static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
{
if (!test_access(access, stp))
return;
nfs4_file_put_access(stp->st_stid.sc_file, access);
clear_access(access, stp);
}
static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
{
switch (to_access) {
case NFS4_SHARE_ACCESS_READ:
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
break;
case NFS4_SHARE_ACCESS_WRITE:
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
break;
case NFS4_SHARE_ACCESS_BOTH:
break;
default:
WARN_ON_ONCE(1);
}
}
__be32
nfsd4_open_downgrade(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
{
struct nfsd4_open_downgrade *od = &u->open_downgrade;
__be32 status;
struct nfs4_ol_stateid *stp;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
cstate->current_fh.fh_dentry);
/* We don't yet support WANT bits: */
if (od->od_deleg_want)
dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
od->od_deleg_want);
status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
&od->od_stateid, &stp, nn);
if (status)
goto out;
status = nfserr_inval;
if (!test_access(od->od_share_access, stp)) {
dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
stp->st_access_bmap, od->od_share_access);
goto put_stateid;
}
if (!test_deny(od->od_share_deny, stp)) {
dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
stp->st_deny_bmap, od->od_share_deny);
goto put_stateid;
}
nfs4_stateid_downgrade(stp, od->od_share_access);
reset_union_bmap_deny(od->od_share_deny, stp);
nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
status = nfs_ok;
put_stateid:
mutex_unlock(&stp->st_mutex);
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
return status;
}
static bool nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
{
struct nfs4_client *clp = s->st_stid.sc_client;
bool unhashed;
LIST_HEAD(reaplist);
struct nfs4_ol_stateid *stp;
spin_lock(&clp->cl_lock);
unhashed = unhash_open_stateid(s, &reaplist);
if (clp->cl_minorversion) {
if (unhashed)
put_ol_stateid_locked(s, &reaplist);
spin_unlock(&clp->cl_lock);
list_for_each_entry(stp, &reaplist, st_locks)
nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
free_ol_stateid_reaplist(&reaplist);
return false;
} else {
spin_unlock(&clp->cl_lock);
free_ol_stateid_reaplist(&reaplist);
return unhashed;
}
}
/*
* nfs4_unlock_state() called after encode
*/
__be32
nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_close *close = &u->close;
__be32 status;
struct nfs4_ol_stateid *stp;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
bool need_move_to_close_list;
dprintk("NFSD: nfsd4_close on file %pd\n",
cstate->current_fh.fh_dentry);
status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
&close->cl_stateid,
SC_TYPE_OPEN, SC_STATUS_CLOSED,
&stp, nn);
nfsd4_bump_seqid(cstate, status);
if (status)
goto out;
spin_lock(&stp->st_stid.sc_client->cl_lock);
stp->st_stid.sc_status |= SC_STATUS_CLOSED;
spin_unlock(&stp->st_stid.sc_client->cl_lock);
/*
* Technically we don't _really_ have to increment or copy it, since
* it should just be gone after this operation and we clobber the
* copied value below, but we continue to do so here just to ensure
* that racing ops see that there was a state change.
*/
nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
need_move_to_close_list = nfsd4_close_open_stateid(stp);
mutex_unlock(&stp->st_mutex);
if (need_move_to_close_list)
move_to_close_lru(stp, net);
/* v4.1+ suggests that we send a special stateid in here, since the
* clients should just ignore this anyway. Since this is not useful
* for v4.0 clients either, we set it to the special close_stateid
* universally.
*
* See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
*/
memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
/* put reference from nfs4_preprocess_seqid_op */
nfs4_put_stid(&stp->st_stid);
out:
return status;
}
__be32
nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_delegreturn *dr = &u->delegreturn;
struct nfs4_delegation *dp;
stateid_t *stateid = &dr->dr_stateid;
struct nfs4_stid *s;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
status = fh_verify(rqstp, &cstate->current_fh, 0, 0);
if (status)
return status;
status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG, SC_STATUS_REVOKED, &s, nn);
if (status)
goto out;
dp = delegstateid(s);
status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
if (status)
goto put_stateid;
status = nfs4_check_fh(&cstate->current_fh, &dp->dl_stid);
if (status)
goto put_stateid;
trace_nfsd_deleg_return(stateid);
destroy_delegation(dp);
smp_mb__after_atomic();
wake_up_var(d_inode(cstate->current_fh.fh_dentry));
put_stateid:
nfs4_put_stid(&dp->dl_stid);
out:
return status;
}
/* last octet in a range */
static inline u64
last_byte_offset(u64 start, u64 len)
{
u64 end;
WARN_ON_ONCE(!len);
end = start + len;
return end > start ? end - 1: NFS4_MAX_UINT64;
}
/*
* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
* locking, this prevents us from being completely protocol-compliant. The
* real solution to this problem is to start using unsigned file offsets in
* the VFS, but this is a very deep change!
*/
static inline void
nfs4_transform_lock_offset(struct file_lock *lock)
{
if (lock->fl_start < 0)
lock->fl_start = OFFSET_MAX;
if (lock->fl_end < 0)
lock->fl_end = OFFSET_MAX;
}
static fl_owner_t
nfsd4_lm_get_owner(fl_owner_t owner)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
nfs4_get_stateowner(&lo->lo_owner);
return owner;
}
static void
nfsd4_lm_put_owner(fl_owner_t owner)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
if (lo)
nfs4_put_stateowner(&lo->lo_owner);
}
/* return pointer to struct nfs4_client if client is expirable */
static bool
nfsd4_lm_lock_expirable(struct file_lock *cfl)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *) cfl->c.flc_owner;
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfsd_net *nn;
if (try_to_expire_client(clp)) {
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
return true;
}
return false;
}
/* schedule laundromat to run immediately and wait for it to complete */
static void
nfsd4_lm_expire_lock(void)
{
flush_workqueue(laundry_wq);
}
static void
nfsd4_lm_notify(struct file_lock *fl)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *) fl->c.flc_owner;
struct net *net = lo->lo_owner.so_client->net;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
struct nfsd4_blocked_lock *nbl = container_of(fl,
struct nfsd4_blocked_lock, nbl_lock);
bool queue = false;
/* An empty list means that something else is going to be using it */
spin_lock(&nn->blocked_locks_lock);
if (!list_empty(&nbl->nbl_list)) {
list_del_init(&nbl->nbl_list);
list_del_init(&nbl->nbl_lru);
queue = true;
}
spin_unlock(&nn->blocked_locks_lock);
if (queue) {
trace_nfsd_cb_notify_lock(lo, nbl);
nfsd4_try_run_cb(&nbl->nbl_cb);
}
}
static const struct lock_manager_operations nfsd_posix_mng_ops = {
.lm_mod_owner = THIS_MODULE,
.lm_notify = nfsd4_lm_notify,
.lm_get_owner = nfsd4_lm_get_owner,
.lm_put_owner = nfsd4_lm_put_owner,
.lm_lock_expirable = nfsd4_lm_lock_expirable,
.lm_expire_lock = nfsd4_lm_expire_lock,
};
static inline void
nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
{
struct nfs4_lockowner *lo;
if (fl->fl_lmops == &nfsd_posix_mng_ops) {
lo = (struct nfs4_lockowner *) fl->c.flc_owner;
xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
GFP_KERNEL);
if (!deny->ld_owner.data)
/* We just don't care that much */
goto nevermind;
deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
} else {
nevermind:
deny->ld_owner.len = 0;
deny->ld_owner.data = NULL;
deny->ld_clientid.cl_boot = 0;
deny->ld_clientid.cl_id = 0;
}
deny->ld_start = fl->fl_start;
deny->ld_length = NFS4_MAX_UINT64;
if (fl->fl_end != NFS4_MAX_UINT64)
deny->ld_length = fl->fl_end - fl->fl_start + 1;
deny->ld_type = NFS4_READ_LT;
if (fl->c.flc_type != F_RDLCK)
deny->ld_type = NFS4_WRITE_LT;
}
static struct nfs4_lockowner *
find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
{
unsigned int strhashval = ownerstr_hashval(owner);
struct nfs4_stateowner *so;
lockdep_assert_held(&clp->cl_lock);
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
so_strhash) {
if (so->so_is_open_owner)
continue;
if (same_owner_str(so, owner))
return lockowner(nfs4_get_stateowner(so));
}
return NULL;
}
static struct nfs4_lockowner *
find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
{
struct nfs4_lockowner *lo;
spin_lock(&clp->cl_lock);
lo = find_lockowner_str_locked(clp, owner);
spin_unlock(&clp->cl_lock);
return lo;
}
static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
{
unhash_lockowner_locked(lockowner(sop));
}
static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
{
struct nfs4_lockowner *lo = lockowner(sop);
kmem_cache_free(lockowner_slab, lo);
}
static const struct nfs4_stateowner_operations lockowner_ops = {
.so_unhash = nfs4_unhash_lockowner,
.so_free = nfs4_free_lockowner,
};
/*
* Alloc a lock owner structure.
* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
* occurred.
*
* strhashval = ownerstr_hashval
*/
static struct nfs4_lockowner *
alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
struct nfs4_ol_stateid *open_stp,
struct nfsd4_lock *lock)
{
struct nfs4_lockowner *lo, *ret;
lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
if (!lo)
return NULL;
INIT_LIST_HEAD(&lo->lo_blocked);
INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
lo->lo_owner.so_is_open_owner = 0;
lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
lo->lo_owner.so_ops = &lockowner_ops;
spin_lock(&clp->cl_lock);
ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
if (ret == NULL) {
list_add(&lo->lo_owner.so_strhash,
&clp->cl_ownerstr_hashtbl[strhashval]);
ret = lo;
} else
nfs4_free_stateowner(&lo->lo_owner);
spin_unlock(&clp->cl_lock);
return ret;
}
static struct nfs4_ol_stateid *
find_lock_stateid(const struct nfs4_lockowner *lo,
const struct nfs4_ol_stateid *ost)
{
struct nfs4_ol_stateid *lst;
lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
/* If ost is not hashed, ost->st_locks will not be valid */
if (!nfs4_ol_stateid_unhashed(ost))
list_for_each_entry(lst, &ost->st_locks, st_locks) {
if (lst->st_stateowner == &lo->lo_owner) {
refcount_inc(&lst->st_stid.sc_count);
return lst;
}
}
return NULL;
}
static struct nfs4_ol_stateid *
init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
struct nfs4_file *fp, struct inode *inode,
struct nfs4_ol_stateid *open_stp)
{
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfs4_ol_stateid *retstp;
mutex_init(&stp->st_mutex);
mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
retry:
spin_lock(&clp->cl_lock);
if (nfs4_ol_stateid_unhashed(open_stp))
goto out_close;
retstp = find_lock_stateid(lo, open_stp);
if (retstp)
goto out_found;
refcount_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = SC_TYPE_LOCK;
stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
get_nfs4_file(fp);
stp->st_stid.sc_file = fp;
if (open_stp->st_stid.sc_export)
stp->st_stid.sc_export =
exp_get(open_stp->st_stid.sc_export);
stp->st_access_bmap = 0;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
spin_lock(&fp->fi_lock);
list_add(&stp->st_locks, &open_stp->st_locks);
list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
spin_unlock(&fp->fi_lock);
spin_unlock(&clp->cl_lock);
return stp;
out_found:
spin_unlock(&clp->cl_lock);
if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
nfs4_put_stid(&retstp->st_stid);
goto retry;
}
/* To keep mutex tracking happy */
mutex_unlock(&stp->st_mutex);
return retstp;
out_close:
spin_unlock(&clp->cl_lock);
mutex_unlock(&stp->st_mutex);
return NULL;
}
static struct nfs4_ol_stateid *
find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
struct inode *inode, struct nfs4_ol_stateid *ost,
bool *new)
{
struct nfs4_stid *ns = NULL;
struct nfs4_ol_stateid *lst;
struct nfs4_openowner *oo = openowner(ost->st_stateowner);
struct nfs4_client *clp = oo->oo_owner.so_client;
*new = false;
spin_lock(&clp->cl_lock);
lst = find_lock_stateid(lo, ost);
spin_unlock(&clp->cl_lock);
if (lst != NULL) {
if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
goto out;
nfs4_put_stid(&lst->st_stid);
}
ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
if (ns == NULL)
return NULL;
lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
if (lst == openlockstateid(ns))
*new = true;
else
nfs4_put_stid(ns);
out:
return lst;
}
static int
check_lock_length(u64 offset, u64 length)
{
return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
(length > ~offset)));
}
static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
{
struct nfs4_file *fp = lock_stp->st_stid.sc_file;
lockdep_assert_held(&fp->fi_lock);
if (test_access(access, lock_stp))
return;
__nfs4_file_get_access(fp, access);
set_access(access, lock_stp);
}
static __be32
lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
struct nfs4_ol_stateid *ost,
struct nfsd4_lock *lock,
struct nfs4_ol_stateid **plst, bool *new)
{
__be32 status;
struct nfs4_file *fi = ost->st_stid.sc_file;
struct nfs4_openowner *oo = openowner(ost->st_stateowner);
struct nfs4_client *cl = oo->oo_owner.so_client;
struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
struct nfs4_lockowner *lo;
struct nfs4_ol_stateid *lst;
unsigned int strhashval;
lo = find_lockowner_str(cl, &lock->lk_new_owner);
if (!lo) {
strhashval = ownerstr_hashval(&lock->lk_new_owner);
lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
if (lo == NULL)
return nfserr_jukebox;
} else {
/* with an existing lockowner, seqids must be the same */
status = nfserr_bad_seqid;
if (!cstate->minorversion &&
lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
goto out;
}
lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
if (lst == NULL) {
status = nfserr_jukebox;
goto out;
}
status = nfs_ok;
*plst = lst;
out:
nfs4_put_stateowner(&lo->lo_owner);
return status;
}
/*
* LOCK operation
*/
__be32
nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_lock *lock = &u->lock;
struct nfs4_openowner *open_sop = NULL;
struct nfs4_lockowner *lock_sop = NULL;
struct nfs4_ol_stateid *lock_stp = NULL;
struct nfs4_ol_stateid *open_stp = NULL;
struct nfs4_file *fp;
struct nfsd_file *nf = NULL;
struct nfsd4_blocked_lock *nbl = NULL;
struct file_lock *file_lock = NULL;
struct file_lock *conflock = NULL;
__be32 status = 0;
int lkflg;
int err;
bool new = false;
unsigned char type;
unsigned int flags = FL_POSIX;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
(long long) lock->lk_offset,
(long long) lock->lk_length);
if (check_lock_length(lock->lk_offset, lock->lk_length))
return nfserr_inval;
status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
if (status != nfs_ok)
return status;
if (exportfs_cannot_lock(cstate->current_fh.fh_dentry->d_sb->s_export_op)) {
status = nfserr_notsupp;
goto out;
}
if (lock->lk_is_new) {
if (nfsd4_has_session(cstate))
/* See rfc 5661 18.10.3: given clientid is ignored: */
memcpy(&lock->lk_new_clientid,
&cstate->clp->cl_clientid,
sizeof(clientid_t));
/* validate and update open stateid and open seqid */
status = nfs4_preprocess_confirmed_seqid_op(cstate,
lock->lk_new_open_seqid,
&lock->lk_new_open_stateid,
&open_stp, nn);
if (status)
goto out;
mutex_unlock(&open_stp->st_mutex);
open_sop = openowner(open_stp->st_stateowner);
status = nfserr_bad_stateid;
if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
&lock->lk_new_clientid))
goto out;
status = lookup_or_create_lock_state(cstate, open_stp, lock,
&lock_stp, &new);
} else {
status = nfs4_preprocess_seqid_op(cstate,
lock->lk_old_lock_seqid,
&lock->lk_old_lock_stateid,
SC_TYPE_LOCK, 0, &lock_stp,
nn);
}
if (status)
goto out;
lock_sop = lockowner(lock_stp->st_stateowner);
lkflg = setlkflg(lock->lk_type);
status = nfs4_check_openmode(lock_stp, lkflg);
if (status)
goto out;
status = nfserr_grace;
if (locks_in_grace(net) && !lock->lk_reclaim)
goto out;
status = nfserr_no_grace;
if (!locks_in_grace(net) && lock->lk_reclaim)
goto out;
if (lock->lk_reclaim &&
test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
goto out;
if (lock->lk_reclaim)
flags |= FL_RECLAIM;
fp = lock_stp->st_stid.sc_file;
switch (lock->lk_type) {
case NFS4_READW_LT:
fallthrough;
case NFS4_READ_LT:
spin_lock(&fp->fi_lock);
nf = find_readable_file_locked(fp);
if (nf)
get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
spin_unlock(&fp->fi_lock);
type = F_RDLCK;
break;
case NFS4_WRITEW_LT:
fallthrough;
case NFS4_WRITE_LT:
spin_lock(&fp->fi_lock);
nf = find_writeable_file_locked(fp);
if (nf)
get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
spin_unlock(&fp->fi_lock);
type = F_WRLCK;
break;
default:
status = nfserr_inval;
goto out;
}
if (!nf) {
status = nfserr_openmode;
goto out;
}
if ((lock->lk_type == NFS4_READW_LT ||
lock->lk_type == NFS4_WRITEW_LT) &&
nfsd4_has_session(cstate) &&
locks_can_async_lock(nf->nf_file->f_op))
flags |= FL_SLEEP;
nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
if (!nbl) {
dprintk("NFSD: %s: unable to allocate block!\n", __func__);
status = nfserr_jukebox;
goto out;
}
file_lock = &nbl->nbl_lock;
file_lock->c.flc_type = type;
file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
file_lock->c.flc_pid = current->tgid;
file_lock->c.flc_file = nf->nf_file;
file_lock->c.flc_flags = flags;
file_lock->fl_lmops = &nfsd_posix_mng_ops;
file_lock->fl_start = lock->lk_offset;
file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
nfs4_transform_lock_offset(file_lock);
conflock = locks_alloc_lock();
if (!conflock) {
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
status = nfserr_jukebox;
goto out;
}
if (flags & FL_SLEEP) {
nbl->nbl_time = ktime_get_boottime_seconds();
spin_lock(&nn->blocked_locks_lock);
list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
kref_get(&nbl->nbl_kref);
spin_unlock(&nn->blocked_locks_lock);
}
err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
switch (err) {
case 0: /* success! */
nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
status = 0;
if (lock->lk_reclaim)
set_bit(NFSD_NET_SOMEBODY_RECLAIMED, &nn->flags);
break;
case FILE_LOCK_DEFERRED:
kref_put(&nbl->nbl_kref, free_nbl);
nbl = NULL;
fallthrough;
case -EAGAIN: /* conflock holds conflicting lock */
status = nfserr_denied;
dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
nfs4_set_lock_denied(conflock, &lock->lk_denied);
break;
case -EDEADLK:
status = nfserr_deadlock;
break;
default:
dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
status = nfserrno(err);
break;
}
out:
if (nbl) {
/* dequeue it if we queued it before */
if (flags & FL_SLEEP) {
spin_lock(&nn->blocked_locks_lock);
if (!list_empty(&nbl->nbl_list) &&
!list_empty(&nbl->nbl_lru)) {
list_del_init(&nbl->nbl_list);
list_del_init(&nbl->nbl_lru);
kref_put(&nbl->nbl_kref, free_nbl);
}
/* nbl can use one of lists to be linked to reaplist */
spin_unlock(&nn->blocked_locks_lock);
}
free_blocked_lock(nbl);
}
if (nf)
nfsd_file_put(nf);
if (lock_stp) {
/* Bump seqid manually if the 4.0 replay owner is openowner */
if (cstate->replay_owner &&
cstate->replay_owner != &lock_sop->lo_owner &&
seqid_mutating_err(ntohl(status)))
lock_sop->lo_owner.so_seqid++;
/*
* If this is a new, never-before-used stateid, and we are
* returning an error, then just go ahead and release it.
*/
if (status && new)
release_lock_stateid(lock_stp);
mutex_unlock(&lock_stp->st_mutex);
nfs4_put_stid(&lock_stp->st_stid);
}
if (open_stp)
nfs4_put_stid(&open_stp->st_stid);
nfsd4_bump_seqid(cstate, status);
if (conflock)
locks_free_lock(conflock);
return status;
}
void nfsd4_lock_release(union nfsd4_op_u *u)
{
struct nfsd4_lock *lock = &u->lock;
struct nfsd4_lock_denied *deny = &lock->lk_denied;
kfree(deny->ld_owner.data);
}
/*
* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
* so we do a temporary open here just to get an open file to pass to
* vfs_test_lock.
*/
static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
{
struct nfsd_file *nf;
struct inode *inode;
__be32 err;
err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
if (err)
return err;
inode = fhp->fh_dentry->d_inode;
inode_lock(inode); /* to block new leases till after test_lock: */
err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
if (err)
goto out;
lock->c.flc_file = nf->nf_file;
err = nfserrno(vfs_test_lock(nf->nf_file, lock));
lock->c.flc_file = NULL;
out:
inode_unlock(inode);
nfsd_file_put(nf);
return err;
}
/*
* LOCKT operation
*/
__be32
nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_lockt *lockt = &u->lockt;
struct file_lock *file_lock = NULL;
struct nfs4_lockowner *lo = NULL;
__be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
if (locks_in_grace(SVC_NET(rqstp)))
return nfserr_grace;
if (check_lock_length(lockt->lt_offset, lockt->lt_length))
return nfserr_inval;
if (!nfsd4_has_session(cstate)) {
status = set_client(&lockt->lt_clientid, cstate, nn);
if (status)
goto out;
}
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
goto out;
file_lock = locks_alloc_lock();
if (!file_lock) {
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
status = nfserr_jukebox;
goto out;
}
switch (lockt->lt_type) {
case NFS4_READ_LT:
case NFS4_READW_LT:
file_lock->c.flc_type = F_RDLCK;
break;
case NFS4_WRITE_LT:
case NFS4_WRITEW_LT:
file_lock->c.flc_type = F_WRLCK;
break;
default:
dprintk("NFSD: nfs4_lockt: bad lock type!\n");
status = nfserr_inval;
goto out;
}
lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
if (lo)
file_lock->c.flc_owner = (fl_owner_t)lo;
file_lock->c.flc_pid = current->tgid;
file_lock->c.flc_flags = FL_POSIX;
file_lock->fl_start = lockt->lt_offset;
file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
nfs4_transform_lock_offset(file_lock);
status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
if (status)
goto out;
if (file_lock->c.flc_type != F_UNLCK) {
status = nfserr_denied;
nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
}
out:
if (lo)
nfs4_put_stateowner(&lo->lo_owner);
if (file_lock)
locks_free_lock(file_lock);
return status;
}
void nfsd4_lockt_release(union nfsd4_op_u *u)
{
struct nfsd4_lockt *lockt = &u->lockt;
struct nfsd4_lock_denied *deny = &lockt->lt_denied;
kfree(deny->ld_owner.data);
}
__be32
nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_locku *locku = &u->locku;
struct nfs4_ol_stateid *stp;
struct nfsd_file *nf = NULL;
struct file_lock *file_lock = NULL;
__be32 status;
int err;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
(long long) locku->lu_offset,
(long long) locku->lu_length);
if (check_lock_length(locku->lu_offset, locku->lu_length))
return nfserr_inval;
status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
&locku->lu_stateid, SC_TYPE_LOCK, 0,
&stp, nn);
if (status)
goto out;
nf = find_any_file(stp->st_stid.sc_file);
if (!nf) {
status = nfserr_lock_range;
goto put_stateid;
}
if (exportfs_cannot_lock(nf->nf_file->f_path.mnt->mnt_sb->s_export_op)) {
status = nfserr_notsupp;
goto put_file;
}
file_lock = locks_alloc_lock();
if (!file_lock) {
dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
status = nfserr_jukebox;
goto put_file;
}
file_lock->c.flc_type = F_UNLCK;
file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
file_lock->c.flc_pid = current->tgid;
file_lock->c.flc_file = nf->nf_file;
file_lock->c.flc_flags = FL_POSIX;
file_lock->fl_lmops = &nfsd_posix_mng_ops;
file_lock->fl_start = locku->lu_offset;
file_lock->fl_end = last_byte_offset(locku->lu_offset,
locku->lu_length);
nfs4_transform_lock_offset(file_lock);
err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
if (err) {
dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
goto out_nfserr;
}
nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
put_file:
nfsd_file_put(nf);
put_stateid:
mutex_unlock(&stp->st_mutex);
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
if (file_lock)
locks_free_lock(file_lock);
return status;
out_nfserr:
status = nfserrno(err);
goto put_file;
}
/*
* returns
* true: locks held by lockowner
* false: no locks held by lockowner
*/
static bool
check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
{
struct file_lock *fl;
int status = false;
struct nfsd_file *nf;
struct inode *inode;
struct file_lock_context *flctx;
spin_lock(&fp->fi_lock);
nf = find_any_file_locked(fp);
if (!nf) {
/* Any valid lock stateid should have some sort of access */
WARN_ON_ONCE(1);
goto out;
}
inode = file_inode(nf->nf_file);
flctx = locks_inode_context(inode);
if (flctx && !list_empty_careful(&flctx->flc_posix)) {
spin_lock(&flctx->flc_lock);
for_each_file_lock(fl, &flctx->flc_posix) {
if (fl->c.flc_owner == (fl_owner_t)lowner) {
status = true;
break;
}
}
spin_unlock(&flctx->flc_lock);
}
out:
spin_unlock(&fp->fi_lock);
return status;
}
/**
* nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
* @rqstp: RPC transaction
* @cstate: NFSv4 COMPOUND state
* @u: RELEASE_LOCKOWNER arguments
*
* Check if there are any locks still held and if not, free the lockowner
* and any lock state that is owned.
*
* Return values:
* %nfs_ok: lockowner released or not found
* %nfserr_locks_held: lockowner still in use
* %nfserr_stale_clientid: clientid no longer active
* %nfserr_expired: clientid not recognized
*/
__be32
nfsd4_release_lockowner(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
clientid_t *clid = &rlockowner->rl_clientid;
struct nfs4_ol_stateid *stp;
struct nfs4_lockowner *lo;
struct nfs4_client *clp;
LIST_HEAD(reaplist);
__be32 status;
dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
clid->cl_boot, clid->cl_id);
status = set_client(clid, cstate, nn);
if (status)
return status;
clp = cstate->clp;
spin_lock(&clp->cl_lock);
lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
if (!lo) {
spin_unlock(&clp->cl_lock);
return nfs_ok;
}
list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
if (check_for_locks(stp->st_stid.sc_file, lo)) {
spin_unlock(&clp->cl_lock);
nfs4_put_stateowner(&lo->lo_owner);
return nfserr_locks_held;
}
}
unhash_lockowner_locked(lo);
while (!list_empty(&lo->lo_owner.so_stateids)) {
stp = list_first_entry(&lo->lo_owner.so_stateids,
struct nfs4_ol_stateid,
st_perstateowner);
unhash_lock_stateid(stp);
put_ol_stateid_locked(stp, &reaplist);
}
spin_unlock(&clp->cl_lock);
free_ol_stateid_reaplist(&reaplist);
remove_blocked_locks(lo);
nfs4_put_stateowner(&lo->lo_owner);
return nfs_ok;
}
static inline struct nfs4_client_reclaim *
alloc_reclaim(void)
{
return kmalloc_obj(struct nfs4_client_reclaim);
}
bool
nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp;
bool found;
down_read(&nn->reclaim_str_hashtbl_lock);
crp = nfsd4_find_reclaim_client(name, nn);
found = (crp && crp->cr_clp);
up_read(&nn->reclaim_str_hashtbl_lock);
return found;
}
/*
* failure => all reset bets are off, nfserr_no_grace...
*/
struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp;
down_write(&nn->reclaim_str_hashtbl_lock);
/*
* A reclaim record for this client name may already exist (for
* example, populated at boot from the recovery directory before
* an in-grace RECLAIM_COMPLETE or an nfsdcld downcall delivers
* the same name). Dedup here so reclaim_str_hashtbl_size stays
* equal to the number of distinct client names; inc_reclaim_complete
* relies on that equality to end the grace period via the fast path.
*/
crp = nfsd4_find_reclaim_client(name, nn);
if (crp) {
if (princhash.len && crp->cr_princhash.len == 0) {
void *pdata = kmemdup(princhash.data, princhash.len,
GFP_KERNEL);
if (pdata) {
crp->cr_princhash.data = pdata;
crp->cr_princhash.len = princhash.len;
} else {
dprintk("%s: failed to allocate memory for princhash.data!\n",
__func__);
crp = NULL;
}
}
up_write(&nn->reclaim_str_hashtbl_lock);
return crp;
}
name.data = kmemdup(name.data, name.len, GFP_KERNEL);
if (!name.data) {
dprintk("%s: failed to allocate memory for name.data!\n",
__func__);
up_write(&nn->reclaim_str_hashtbl_lock);
return NULL;
}
if (princhash.len) {
princhash.data = kmemdup(princhash.data, princhash.len, GFP_KERNEL);
if (!princhash.data) {
dprintk("%s: failed to allocate memory for princhash.data!\n",
__func__);
kfree(name.data);
up_write(&nn->reclaim_str_hashtbl_lock);
return NULL;
}
} else
princhash.data = NULL;
crp = alloc_reclaim();
if (crp) {
strhashval = clientstr_hashval(name);
INIT_LIST_HEAD(&crp->cr_strhash);
list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
crp->cr_name.data = name.data;
crp->cr_name.len = name.len;
crp->cr_princhash.data = princhash.data;
crp->cr_princhash.len = princhash.len;
crp->cr_clp = NULL;
nn->reclaim_str_hashtbl_size++;
} else {
kfree(name.data);
kfree(princhash.data);
}
up_write(&nn->reclaim_str_hashtbl_lock);
return crp;
}
void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
{
list_del(&crp->cr_strhash);
kfree(crp->cr_name.data);
kfree(crp->cr_princhash.data);
kfree(crp);
nn->reclaim_str_hashtbl_size--;
}
void
nfs4_release_reclaim(struct nfsd_net *nn)
{
struct nfs4_client_reclaim *crp = NULL;
int i;
down_write(&nn->reclaim_str_hashtbl_lock);
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
crp = list_entry(nn->reclaim_str_hashtbl[i].next,
struct nfs4_client_reclaim, cr_strhash);
nfs4_remove_reclaim_record(crp, nn);
}
}
WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
up_write(&nn->reclaim_str_hashtbl_lock);
}
/*
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
strhashval = clientstr_hashval(name);
list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
if (compare_blob(&crp->cr_name, &name) == 0) {
return crp;
}
}
return NULL;
}
__be32
nfs4_check_open_reclaim(struct nfs4_client *clp)
{
if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
return nfserr_no_grace;
if (nfsd4_client_record_check(clp))
return nfserr_reclaim_bad;
return nfs_ok;
}
/*
* Since the lifetime of a delegation isn't limited to that of an open, a
* client may quite reasonably hang on to a delegation as long as it has
* the inode cached. This becomes an obvious problem the first time a
* client's inode cache approaches the size of the server's total memory.
*
* For now we avoid this problem by imposing a hard limit on the number
* of delegations, which varies according to the server's memory size.
*/
static void
set_max_delegations(void)
{
/*
* Allow at most 4 delegations per megabyte of RAM. Quick
* estimates suggest that in the worst case (where every delegation
* is for a different inode), a delegation could take about 1.5K,
* giving a worst case usage of about 6% of memory.
*/
max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
}
static int nfs4_state_create_net(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
int i;
nn->conf_id_hashtbl = kmalloc_objs(struct list_head, CLIENT_HASH_SIZE);
if (!nn->conf_id_hashtbl)
goto err;
nn->unconf_id_hashtbl = kmalloc_objs(struct list_head, CLIENT_HASH_SIZE);
if (!nn->unconf_id_hashtbl)
goto err_unconf_id;
nn->sessionid_hashtbl = kmalloc_objs(struct list_head,
SESSION_HASH_SIZE);
if (!nn->sessionid_hashtbl)
goto err_sessionid;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
}
for (i = 0; i < SESSION_HASH_SIZE; i++)
INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
nn->conf_name_tree = RB_ROOT;
nn->unconf_name_tree = RB_ROOT;
nn->boot_time = ktime_get_real_seconds();
nn->boot_time_bt = ktime_get_boottime_seconds();
clear_bit(NFSD_NET_GRACE_ENDED, &nn->flags);
clear_bit(NFSD_NET_GRACE_END_FORCED, &nn->flags);
nn->nfsd4_manager.block_opens = true;
INIT_LIST_HEAD(&nn->nfsd4_manager.list);
INIT_LIST_HEAD(&nn->client_lru);
INIT_LIST_HEAD(&nn->close_lru);
INIT_LIST_HEAD(&nn->del_recall_lru);
spin_lock_init(&nn->deleg_lock);
spin_lock_init(&nn->client_lock);
spin_lock_init(&nn->s2s_cp_lock);
idr_init(&nn->s2s_cp_stateids);
atomic_set(&nn->pending_async_copies, 0);
spin_lock_init(&nn->blocked_locks_lock);
INIT_LIST_HEAD(&nn->blocked_locks_lru);
INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
/* Make sure this cannot run until client tracking is initialised */
disable_delayed_work(&nn->laundromat_work);
INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
get_net(net);
nn->nfsd_client_shrinker = shrinker_alloc(0, "nfsd-client");
if (!nn->nfsd_client_shrinker)
goto err_shrinker;
nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan;
nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count;
nn->nfsd_client_shrinker->private_data = nn;
shrinker_register(nn->nfsd_client_shrinker);
return 0;
err_shrinker:
put_net(net);
kfree(nn->sessionid_hashtbl);
err_sessionid:
kfree(nn->unconf_id_hashtbl);
err_unconf_id:
kfree(nn->conf_id_hashtbl);
err:
return -ENOMEM;
}
static void
nfs4_state_destroy_net(struct net *net)
{
int i;
struct nfs4_client *clp = NULL;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&nn->conf_id_hashtbl[i])) {
clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
destroy_client(clp);
}
}
WARN_ON(!list_empty(&nn->blocked_locks_lru));
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&nn->unconf_id_hashtbl[i])) {
clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
destroy_client(clp);
}
}
kfree(nn->sessionid_hashtbl);
kfree(nn->unconf_id_hashtbl);
kfree(nn->conf_id_hashtbl);
put_net(net);
}
int
nfs4_state_start_net(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
int ret;
ret = nfs4_state_create_net(net);
if (ret)
return ret;
locks_start_grace(net, &nn->nfsd4_manager);
nfsd4_client_tracking_init(net);
/* safe for laundromat to run now */
enable_delayed_work(&nn->laundromat_work);
if (test_bit(NFSD_NET_TRACK_RECLAIM_COMPLETES, &nn->flags) &&
nn->reclaim_str_hashtbl_size == 0)
goto skip_grace;
printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
nn->nfsd4_grace, net->ns.inum);
trace_nfsd_grace_start(nn);
queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
return 0;
skip_grace:
printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
net->ns.inum);
queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
nfsd4_end_grace(nn);
return 0;
}
/* initialization to perform when the nfsd service is started: */
int
nfs4_state_start(void)
{
int ret;
ret = rhltable_init(&nfs4_file_rhltable, &nfs4_file_rhash_params);
if (ret)
return ret;
nfsd_slot_shrinker = shrinker_alloc(0, "nfsd-DRC-slot");
if (!nfsd_slot_shrinker) {
rhltable_destroy(&nfs4_file_rhltable);
return -ENOMEM;
}
nfsd_slot_shrinker->count_objects = nfsd_slot_shrinker_count;
nfsd_slot_shrinker->scan_objects = nfsd_slot_shrinker_scan;
shrinker_register(nfsd_slot_shrinker);
set_max_delegations();
return 0;
}
void
nfs4_state_shutdown_net(struct net *net)
{
struct nfs4_delegation *dp = NULL;
struct list_head *pos, *next, reaplist;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
shrinker_free(nn->nfsd_client_shrinker);
cancel_work_sync(&nn->nfsd_shrinker_work);
disable_delayed_work_sync(&nn->laundromat_work);
locks_end_grace(&nn->nfsd4_manager);
INIT_LIST_HEAD(&reaplist);
spin_lock(&nn->deleg_lock);
list_for_each_safe(pos, next, &nn->del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
unhash_delegation_locked(dp, SC_STATUS_CLOSED);
list_add(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&nn->deleg_lock);
list_for_each_safe(pos, next, &reaplist) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
destroy_unhashed_deleg(dp);
}
nfsd4_client_tracking_exit(net);
nfs4_state_destroy_net(net);
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
nfsd4_ssc_shutdown_umount(nn);
#endif
}
void
nfs4_state_shutdown(void)
{
rhltable_destroy(&nfs4_file_rhltable);
shrinker_free(nfsd_slot_shrinker);
}
static void
get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
{
if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
CURRENT_STATEID(stateid))
memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
}
static void
put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
{
if (cstate->minorversion) {
memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
}
}
void
clear_current_stateid(struct nfsd4_compound_state *cstate)
{
CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
}
/*
* functions to set current state id
*/
void
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->open_downgrade.od_stateid);
}
void
nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->open.op_stateid);
}
void
nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->close.cl_stateid);
}
void
nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
put_stateid(cstate, &u->lock.lk_resp_stateid);
}
/*
* functions to consume current state id
*/
void
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->open_downgrade.od_stateid);
}
void
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->delegreturn.dr_stateid);
}
void
nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->free_stateid.fr_stateid);
}
void
nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->setattr.sa_stateid);
}
void
nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->close.cl_stateid);
}
void
nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->locku.lu_stateid);
}
void
nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->read.rd_stateid);
}
void
nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
union nfsd4_op_u *u)
{
get_stateid(cstate, &u->write.wr_stateid);
}
/**
* nfsd4_vet_deleg_time - vet and set the timespec for a delegated timestamp update
* @req: timestamp from the client
* @orig: original timestamp in the inode
* @now: current time
*
* Given a timestamp from the client response, check it against the
* current timestamp in the inode and the current time. Returns true
* if the inode's timestamp needs to be updated, and false otherwise.
* @req may also be changed if the timestamp needs to be clamped.
*/
bool nfsd4_vet_deleg_time(struct timespec64 *req, const struct timespec64 *orig,
const struct timespec64 *now)
{
/*
* "When the time presented is before the original time, then the
* update is ignored." Also no need to update if there is no change.
*/
if (timespec64_compare(req, orig) <= 0)
return false;
/*
* "When the time presented is in the future, the server can either
* clamp the new time to the current time, or it may
* return NFS4ERR_DELAY to the client, allowing it to retry."
*/
if (timespec64_compare(req, now) > 0)
*req = *now;
return true;
}
static int cb_getattr_update_times(struct dentry *dentry, struct nfs4_delegation *dp)
{
struct inode *inode = d_inode(dentry);
struct nfs4_cb_fattr *ncf = &dp->dl_cb_fattr;
struct iattr attrs = { };
int ret;
if (deleg_attrs_deleg(dp->dl_type)) {
struct timespec64 now = current_time(inode);
attrs.ia_atime = ncf->ncf_cb_atime;
attrs.ia_mtime = ncf->ncf_cb_mtime;
if (nfsd4_vet_deleg_time(&attrs.ia_atime, &dp->dl_atime, &now))
attrs.ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
if (nfsd4_vet_deleg_time(&attrs.ia_mtime, &dp->dl_mtime, &now)) {
attrs.ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
attrs.ia_ctime = attrs.ia_mtime;
if (nfsd4_vet_deleg_time(&attrs.ia_ctime, &dp->dl_ctime, &now))
attrs.ia_valid |= ATTR_CTIME | ATTR_CTIME_SET;
}
} else {
attrs.ia_valid |= ATTR_MTIME | ATTR_CTIME;
}
if (!attrs.ia_valid)
return 0;
attrs.ia_valid |= ATTR_DELEG;
inode_lock(inode);
ret = notify_change(&nop_mnt_idmap, dentry, &attrs, NULL);
inode_unlock(inode);
return ret;
}
/**
* nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict
* @rqstp: RPC transaction context
* @dentry: dentry of inode to be checked for a conflict
* @pdp: returned WRITE delegation, if one was found
*
* This function is called when there is a conflict between a write
* delegation and a change/size GETATTR from another client. The server
* must either use the CB_GETATTR to get the current values of the
* attributes from the client that holds the delegation or recall the
* delegation before replying to the GETATTR. See RFC 8881 section
* 18.7.4.
*
* Returns 0 if there is no conflict; otherwise an nfs_stat
* code is returned. If @pdp is set to a non-NULL value, then the
* caller must put the reference.
*/
__be32
nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct dentry *dentry,
struct nfs4_delegation **pdp)
{
struct nfsd_thread_local_info *ntli = rqstp->rq_private;
struct file_lock_context *ctx;
struct nfs4_delegation *dp = NULL;
struct file_lease *fl;
struct nfs4_cb_fattr *ncf;
struct inode *inode = d_inode(dentry);
__be32 status;
ctx = locks_inode_context(inode);
if (!ctx)
return nfs_ok;
#define NON_NFSD_LEASE ((void *)1)
spin_lock(&ctx->flc_lock);
for_each_file_lock(fl, &ctx->flc_lease) {
if (fl->c.flc_flags == FL_LAYOUT)
continue;
if (fl->c.flc_type == F_WRLCK) {
if (fl->fl_lmops == &nfsd_lease_mng_ops)
dp = fl->c.flc_owner;
else
dp = NON_NFSD_LEASE;
}
break;
}
if (dp == NULL || dp == NON_NFSD_LEASE ||
dp->dl_recall.cb_clp == *(ntli->ntli_lease_breaker)) {
spin_unlock(&ctx->flc_lock);
if (dp == NON_NFSD_LEASE) {
status = nfserrno(nfsd_open_break_lease(inode,
NFSD_MAY_READ));
if (status != nfserr_jukebox ||
!nfsd_wait_for_delegreturn(rqstp, inode))
return status;
}
return 0;
}
refcount_inc(&dp->dl_stid.sc_count);
ncf = &dp->dl_cb_fattr;
nfs4_cb_getattr(&dp->dl_cb_fattr);
spin_unlock(&ctx->flc_lock);
wait_on_bit_timeout(&ncf->ncf_getattr.cb_flags, NFSD4_CALLBACK_RUNNING,
TASK_UNINTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT);
if (ncf->ncf_cb_status) {
/* Recall delegation only if client didn't respond */
status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
if (status != nfserr_jukebox ||
!nfsd_wait_for_delegreturn(rqstp, inode))
goto out_status;
status = nfs_ok;
goto out_status;
}
if (!ncf->ncf_file_modified) {
if (ncf->ncf_initial_cinfo != ncf->ncf_cb_change)
ncf->ncf_file_modified = true;
else if (i_size_read(inode) != ncf->ncf_cb_fsize)
ncf->ncf_file_modified = true;
}
if (ncf->ncf_file_modified) {
int err;
/*
* Per section 10.4.3 of RFC 8881, the server would
* not update the file's metadata with the client's
* modified size
*/
err = cb_getattr_update_times(dentry, dp);
if (err) {
status = nfserrno(err);
goto out_status;
}
ncf->ncf_cur_fsize = ncf->ncf_cb_fsize;
*pdp = dp;
return nfs_ok;
}
status = nfs_ok;
out_status:
nfs4_put_stid(&dp->dl_stid);
return status;
}
#define GDD_WORD0_CHILD_ATTRS (FATTR4_WORD0_TYPE | \
FATTR4_WORD0_CHANGE | \
FATTR4_WORD0_SIZE | \
FATTR4_WORD0_FILEID | \
FATTR4_WORD0_FILEHANDLE)
#define GDD_WORD1_CHILD_ATTRS (FATTR4_WORD1_MODE | \
FATTR4_WORD1_NUMLINKS | \
FATTR4_WORD1_RAWDEV | \
FATTR4_WORD1_SPACE_USED | \
FATTR4_WORD1_TIME_ACCESS | \
FATTR4_WORD1_TIME_METADATA | \
FATTR4_WORD1_TIME_MODIFY | \
FATTR4_WORD1_TIME_CREATE)
#define GDD_WORD0_DIR_ATTRS (FATTR4_WORD0_CHANGE | \
FATTR4_WORD0_SIZE)
#define GDD_WORD1_DIR_ATTRS (FATTR4_WORD1_NUMLINKS | \
FATTR4_WORD1_SPACE_USED | \
FATTR4_WORD1_TIME_ACCESS | \
FATTR4_WORD1_TIME_METADATA | \
FATTR4_WORD1_TIME_MODIFY)
/**
* nfsd_get_dir_deleg - attempt to get a directory delegation
* @cstate: compound state
* @gdd: GET_DIR_DELEGATION arg/resp structure
* @nf: nfsd_file opened on the directory
*
* Given a GET_DIR_DELEGATION request @gdd, attempt to acquire a delegation
* on the directory to which @nf refers.
*/
struct nfs4_delegation *
nfsd_get_dir_deleg(struct nfsd4_compound_state *cstate,
struct nfsd4_get_dir_delegation *gdd,
struct nfsd_file *nf)
{
struct nfs4_client *clp = cstate->clp;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct nfs4_delegation *dp;
struct file_lease *fl;
struct nfs4_file *fp, *rfp;
int status = 0;
fp = nfsd4_alloc_file();
if (!fp)
return ERR_PTR(-ENOMEM);
nfsd4_file_init(&cstate->current_fh, fp);
rfp = nfsd4_file_hash_insert(fp, &cstate->current_fh);
if (unlikely(!rfp)) {
put_nfs4_file(fp);
return ERR_PTR(-ENOMEM);
}
if (rfp != fp) {
put_nfs4_file(fp);
fp = rfp;
}
/* if this client already has one, return that it's unavailable */
spin_lock(&nn->deleg_lock);
spin_lock(&fp->fi_lock);
/* existing delegation? */
if (nfs4_delegation_exists(clp, fp)) {
status = -EAGAIN;
} else if (!rcu_dereference_protected(fp->fi_deleg_file,
lockdep_is_held(&fp->fi_lock))) {
rcu_assign_pointer(fp->fi_deleg_file, nfsd_file_get(nf));
fp->fi_delegees = 1;
} else {
++fp->fi_delegees;
}
spin_unlock(&fp->fi_lock);
spin_unlock(&nn->deleg_lock);
if (status) {
put_nfs4_file(fp);
return ERR_PTR(status);
}
/* Try to set up the lease */
status = -ENOMEM;
dp = alloc_init_dir_deleg(clp, fp);
if (!dp)
goto out_delegees;
if (cstate->current_fh.fh_export)
dp->dl_stid.sc_export =
exp_get(cstate->current_fh.fh_export);
/*
* NB: gddr_notification[0] represents the notifications that
* will be granted to the client
*/
dp->dl_notify_mask = gdd->gddr_notification[0];
dp->dl_child_attrs[0] = gdd->gdda_child_attributes[0] & GDD_WORD0_CHILD_ATTRS;
dp->dl_child_attrs[1] = gdd->gdda_child_attributes[1] & GDD_WORD1_CHILD_ATTRS;
dp->dl_dir_attrs[0] = gdd->gdda_dir_attributes[0] & GDD_WORD0_DIR_ATTRS;
dp->dl_dir_attrs[1] = gdd->gdda_dir_attributes[1] & GDD_WORD1_DIR_ATTRS;
fl = nfs4_alloc_init_lease(dp, dp->dl_notify_mask);
if (!fl)
goto out_put_stid;
status = kernel_setlease(nf->nf_file,
fl->c.flc_type, &fl, NULL);
if (fl)
locks_free_lease(fl);
if (status)
goto out_put_stid;
/*
* Now, try to hash it. This can fail if we race another nfsd task
* trying to set a delegation on the same file. If that happens,
* then just say UNAVAIL.
*/
spin_lock(&nn->deleg_lock);
spin_lock(&clp->cl_lock);
spin_lock(&fp->fi_lock);
status = hash_delegation_locked(dp, fp);
spin_unlock(&fp->fi_lock);
spin_unlock(&clp->cl_lock);
spin_unlock(&nn->deleg_lock);
if (!status) {
put_nfs4_file(fp);
nfsd_fsnotify_recalc_mask(nf);
return dp;
}
/*
* Something failed after the lease was set. Drop the lease and clean
* up the stid. The lease's flc_file is the fi_deleg_file (see
* nfs4_alloc_init_lease()), which is not necessarily this client's
* @nf when an earlier client already holds a delegation on @fp.
* generic_delete_lease() matches on flc_file, so unlock against
* fi_deleg_file or the lease will be leaked (and later freed with the
* stid, leading to a use-after-free when it's eventually broken).
*/
kernel_setlease(rcu_dereference_protected(fp->fi_deleg_file, 1)->nf_file,
F_UNLCK, NULL, (void **)&dp);
nfsd_fsnotify_recalc_mask(nf);
out_put_stid:
nfs4_put_stid(&dp->dl_stid);
out_delegees:
put_deleg_file(fp);
put_nfs4_file(fp);
return ERR_PTR(status);
}
/**
* nfsd_update_cmtime_attr - update file's delegated ctime/mtime,
* and optionally other attributes (ie ATTR_ATIME).
* @f: pointer to an opened file
* @flags: any additional flags that should be updated
*
* Given upon opening a file delegated attributes were issues, update
* @f attributes to current times.
*/
void nfsd_update_cmtime_attr(struct file *f, unsigned int flags)
{
int ret;
struct inode *inode = file_inode(f);
struct iattr attr = {
.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_DELEG | flags,
};
inode_lock(inode);
ret = notify_change(&nop_mnt_idmap, f->f_path.dentry, &attr, NULL);
inode_unlock(inode);
if (ret)
pr_notice_ratelimited("nfsd: Unable to update timestamps on "
"inode %02x:%02x:%llu: %d\n",
MAJOR(inode->i_sb->s_dev),
MINOR(inode->i_sb->s_dev),
inode->i_ino, ret);
}
static void
nfsd4_run_cb_notify(struct nfsd4_cb_notify *ncn)
{
struct nfs4_delegation *dp = container_of(ncn, struct nfs4_delegation, dl_cb_notify);
if (test_and_set_bit(NFSD4_CALLBACK_RUNNING, &ncn->ncn_cb.cb_flags))
return;
if (!refcount_inc_not_zero(&dp->dl_stid.sc_count))
clear_bit(NFSD4_CALLBACK_RUNNING, &ncn->ncn_cb.cb_flags);
else
nfsd4_run_cb(&ncn->ncn_cb);
}
static struct nfsd_notify_event *
alloc_nfsd_notify_event(u32 mask, const struct qstr *q, struct dentry *dentry,
struct inode *target)
{
struct nfsd_notify_event *ne;
struct name_snapshot newname;
u32 newnamelen = 0;
/*
* For a rename, @q is the old name and the live dentry carries the new
* name. Snapshot the new name now, while it is guaranteed to describe
* this event: the dentry can be renamed again before the CB_NOTIFY work
* runs, which would corrupt a late read in nfsd4_encode_notify_event().
*/
if (mask & FS_RENAME) {
take_dentry_name_snapshot(&newname, dentry);
newnamelen = newname.name.len;
}
ne = kmalloc(struct_size(ne, ne_name, q->len + 1 +
(newnamelen ? newnamelen + 1 : 0)), GFP_NOFS);
if (!ne)
goto out;
memcpy(ne->ne_name, q->name, q->len);
ne->ne_name[q->len] = '\0';
ne->ne_namelen = q->len;
ne->ne_newnamelen = newnamelen;
if (newnamelen) {
char *p = nfsd_notify_event_newname(ne);
memcpy(p, newname.name.name, newnamelen);
p[newnamelen] = '\0';
}
refcount_set(&ne->ne_ref, 1);
ne->ne_mask = mask;
ne->ne_dentry = dget(dentry);
ne->ne_target = target;
if (ne->ne_target)
ihold(ne->ne_target);
out:
if (mask & FS_RENAME)
release_dentry_name_snapshot(&newname);
return ne;
}
static bool
should_notify_deleg(u32 mask, struct file_lease *fl)
{
/* Don't notify the client generating the event */
if (nfsd_breaker_owns_lease(fl))
return false;
/* Skip if this event wasn't ignored by the lease */
if ((mask & FS_DELETE) && !(fl->c.flc_flags & FL_IGN_DIR_DELETE))
return false;
if ((mask & FS_CREATE) && !(fl->c.flc_flags & FL_IGN_DIR_CREATE))
return false;
if ((mask & FS_RENAME) && !(fl->c.flc_flags & FL_IGN_DIR_RENAME))
return false;
return true;
}
static void
nfsd_recall_all_dir_delegs(const struct inode *dir)
{
struct file_lock_context *ctx = locks_inode_context(dir);
struct file_lock_core *flc;
spin_lock(&ctx->flc_lock);
list_for_each_entry(flc, &ctx->flc_lease, flc_list) {
struct file_lease *fl = container_of(flc, struct file_lease, c);
if (fl->fl_lmops == &nfsd_lease_mng_ops)
nfsd_break_deleg_cb(fl);
}
spin_unlock(&ctx->flc_lock);
}
int
nfsd_handle_dir_event(u32 mask, const struct inode *dir, const void *data,
int data_type, const struct qstr *name)
{
struct dentry *dentry = fsnotify_data_dentry(data, data_type);
struct inode *target = fsnotify_data_rename_target(data, data_type);
struct file_lock_context *ctx;
struct file_lock_core *flc;
struct nfsd_notify_event *evt;
trace_nfsd_handle_dir_event(mask, dir, name);
/* Normalize cross-dir rename events to create/delete */
if (mask & FS_MOVED_FROM) {
mask &= ~FS_MOVED_FROM;
mask |= FS_DELETE;
}
if (mask & FS_MOVED_TO) {
mask &= ~FS_MOVED_TO;
mask |= FS_CREATE;
}
/*
* FS_RENAME fires on the source directory even for a cross-dir
* rename, where the moved entry now lives under a different parent.
* NOTIFY4_RENAME_ENTRY describes an in-place rename, so reporting it
* here would advertise a name absent from this directory.
*/
if ((mask & FS_RENAME) && dentry && d_inode(dentry->d_parent) != dir)
mask &= ~FS_RENAME;
/* Don't do anything if this is not an expected event */
if (!(mask & (FS_CREATE|FS_DELETE|FS_RENAME)))
return 0;
ctx = locks_inode_context(dir);
if (!ctx || list_empty(&ctx->flc_lease))
return 0;
evt = alloc_nfsd_notify_event(mask, name, dentry, target);
if (!evt) {
nfsd_recall_all_dir_delegs(dir);
return 0;
}
spin_lock(&ctx->flc_lock);
list_for_each_entry(flc, &ctx->flc_lease, flc_list) {
struct file_lease *fl = container_of(flc, struct file_lease, c);
struct nfs4_delegation *dp = flc->flc_owner;
struct nfsd4_cb_notify *ncn = &dp->dl_cb_notify;
if (!should_notify_deleg(mask, fl))
continue;
spin_lock(&ncn->ncn_lock);
if (ncn->ncn_evt_cnt >= NOTIFY4_EVENT_QUEUE_SIZE) {
/* We're generating notifications too fast. Recall. */
spin_unlock(&ncn->ncn_lock);
nfsd_break_deleg_cb(fl);
continue;
}
ncn->ncn_evt[ncn->ncn_evt_cnt++] = nfsd_notify_event_get(evt);
spin_unlock(&ncn->ncn_lock);
nfsd4_run_cb_notify(ncn);
}
spin_unlock(&ctx->flc_lock);
nfsd_notify_event_put(evt);
return 0;
}
