btrfs_cow_block identifier - Linux source code next-20260811

Projects

linux

Versions

FIXME
- FIXME
  - next-20260811

Defined in 1 files as a prototype:

fs/btrfs/ctree.h, line 559 (as a prototype)

Defined in 1 files as a function:

fs/btrfs/ctree.c, line 648 (as a function)

Referenced in 4 files:

Smatch caller information:

fs/btrfs/relocation.c do_relocation() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->block_rsv->failfast	0
PARAM_VALUE	0	trans->block_rsv->qgroup_rsv_reserved	0
PARAM_VALUE	0	trans->block_rsv->qgroup_rsv_size	0
PARAM_VALUE	0	trans->block_rsv->space_info	0,4096-ptr_max
PARAM_VALUE	0	trans->block_rsv->type	9
PARAM_VALUE	0	trans->fs_info->block_group_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->block_group_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->block_group_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->fs_roots_radix.xa_flags	0,67108864-u32max
PARAM_VALUE	0	trans->fs_info->global_root_lock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->quota_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->quota_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->quota_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->remap_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	0	trans->fs_info->uuid_root->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->encode_fh	0,2,1398972869330624512,1616549510479982592,2037984473558433792,2776440803454029824,3228746867770966016,3502492669594062848,3526768263295340544,3559173554394271744,5000850239487131648,5583386343686406144,5817357685191483392-s64max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_parent	0,4672,5297,4573560380487,148606482432692224,436469935444291584,467281172929331200,529780027764285440,1092893949038768128,1556959531105513472,1608953577475584000,1649536479961075712,2404761408063094784,2970908329832960000-s64max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->get_parent	0,8931,264940071972966400,291591359766798336,565128213429456896,893189740598853632,1241177127089143808,1474696885321834496,1812477326828269568,1893665921928286208,2210088671756947456,2437012291923775488,2483979068402987008-s64max
PARAM_VALUE	1	root->reloc_root->node	4096-ptr_max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	3	parent->lock.first_waiter->type	0-1
PARAM_VALUE	4	parent_slot	0-s32max
PARAM_VALUE	5	cow_ret	528621844554956800
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
BUF_SIZE	0	trans	(-1),1-s32max
BUF_SIZE	0	trans	(-1),1-s32max
BUF_SIZE	2	buf	(-1)-s32max
BUF_SIZE	2	buf	(-1)-s32max
CAPPED_DATA	2	buf	1
CAPPED_DATA	4	parent_slot	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	r select_reloc_root
DATA_SOURCE	2	buf	r btrfs_read_node_slot
RX_PATH
TASK_NOT_RUNNING
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	2	buf->len
NO_OVERFLOW_SIMPLE	2	buf->start
LOCK2		&fs_info->cleaner_mutex
LOCK2	2	&buf->lock
HALF_LOCKED2		&cow->lock
HALF_LOCKED2		&fs_info->reclaim_bgs_lock
TYPE_LOCK		(struct btrfs_fs_info)->cleaner_mutex
TYPE_LOCK		(struct btrfs_fs_info)->reclaim_bgs_lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/relocation.c merge_reloc_root() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->block_group_cache_lock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->ref_verify_lock.rlock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->transaction->delayed_refs.head_refs.xa_lock.rlock.dep_map->name	0-255
PARAM_VALUE	0	trans->writeback_inhibited_ebs.xa_lock.rlock.dep_map->name	0-255
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->encode_fh	0,2,1398972869330624512,1616549510479982592,2037984473558433792,2776440803454029824,3228746867770966016,3502492669594062848,3526768263295340544,3559173554394271744,5000850239487131648,5583386343686406144,5817357685191483392-s64max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_parent	0,4672,5297,4573560380487,148606482432692224,436469935444291584,467281172929331200,529780027764285440,1092893949038768128,1556959531105513472,1608953577475584000,1649536479961075712,2404761408063094784,2970908329832960000-s64max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->get_parent	0,8931,264940071972966400,291591359766798336,565128213429456896,893189740598853632,1241177127089143808,1474696885321834496,1812477326828269568,1893665921928286208,2210088671756947456,2437012291923775488,2483979068402987008-s64max
PARAM_VALUE	1	root->node	4096-ptr_max
PARAM_VALUE	1	root->node->lock.dep_map->name	0-255
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.osq.tail.counter	0-s32max
PARAM_VALUE	1	root->node->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.dep_map->name	0-255
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	2	buf->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	3	parent	0
PARAM_VALUE	4	parent_slot	0
PARAM_VALUE	5	cow_ret	5824594225617121280
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
BUF_SIZE	1	root	(-1),2888
BUF_SIZE	1	root	(-1),2888
CAPPED_DATA	1	root->node	1
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	r btrfs_start_transaction
DATA_SOURCE	1	root	$1

fs/btrfs/relocation.c replace_path() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->block_rsv	0,4096-ptr_max
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node	4096-ptr_max
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.osq.tail.counter	0-s32max
PARAM_VALUE	1	root->node->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	2	buf->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	3	parent	0
PARAM_VALUE	4	parent_slot	0
PARAM_VALUE	5	cow_ret	2504747916751925248
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
BUF_SIZE	0	trans	(-1),4,24,64,168-s32max
BUF_SIZE	0	trans	(-1),4,24,64,168-s32max
BUF_SIZE	1	root	(-1),2888
BUF_SIZE	1	root	(-1),2888
CAPPED_DATA	1	root	1
CAPPED_DATA	1	root->node	1
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$2
NO_OVERFLOW_SIMPLE	2	buf->len
NO_OVERFLOW_SIMPLE	2	buf->start
HALF_LOCKED2		&cow->lock

fs/btrfs/relocation.c replace_path() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->block_rsv	0,4096-ptr_max
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.osq.tail.counter	0-s32max
PARAM_VALUE	1	root->node->log_index	(-128)-127
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->lock.first_waiter->handoff_set	1
PARAM_VALUE	3	parent->lock.first_waiter->type	0-1
PARAM_VALUE	3	parent->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent->log_index	(-128)-127
PARAM_VALUE	4	parent_slot	0-s32max
PARAM_VALUE	5	cow_ret	2504747916751925248
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
BUF_SIZE	0	trans	(-1),4,24,64,168-s32max
BUF_SIZE	0	trans	(-1),4,24,64,168-s32max
BUF_SIZE	1	root	(-1),2888
BUF_SIZE	1	root	(-1),2888
BUF_SIZE	2	buf	(-1)-s32max
BUF_SIZE	2	buf	(-1)-s32max
CAPPED_DATA	0	trans->transaction	1
CAPPED_DATA	0	trans->transid	1
CAPPED_DATA	1	root	1
CAPPED_DATA	2	buf	1
CAPPED_DATA	4	parent_slot	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$2
DATA_SOURCE	2	buf	r btrfs_read_node_slot
NO_OVERFLOW_SIMPLE	2	buf->len
NO_OVERFLOW_SIMPLE	2	buf->start
NO_OVERFLOW_SIMPLE	3	parent->len
NO_OVERFLOW_SIMPLE	3	parent->start
LOCK2	2	&buf->lock
HALF_LOCKED2		&cow->lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/transaction.c commit_cowonly_roots() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->fs_info	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	0	trans->fs_info->btrfs_state_change_map	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.first_waiter->list.prev->next	5159360019465732096
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.first_waiter->list.prev->prev	5159360019465732096
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.first_waiter->task->blocked_lock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.first_waiter->task->blocked_lock.owner	(-1)
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.first_waiter->task->blocked_lock.owner_cpu	4294967295
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.first_waiter->task->usage.refs.counter	s32min-s32max
PARAM_VALUE	0	trans->fs_info->qgroup_ioctl_lock.osq.tail.counter	0-s32max
PARAM_VALUE	0	trans->fs_info->qgroup_lock.rlock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->reloc_ctl_lock.rlock.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->remap_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->remap_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->transaction_kthread->delays->blkio_count	0-4294967295
PARAM_VALUE	0	trans->fs_info->transaction_kthread->sched_task_group->idle	s32min-s32max
PARAM_VALUE	0	trans->fs_info->tree_root	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->tree_root->node	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->objectid_mutex.dep_map->name	0-255
PARAM_VALUE	0	trans->fs_info->tree_root->objectid_mutex.first_waiter->list.prev->next	5159360019465732096
PARAM_VALUE	0	trans->fs_info->tree_root->objectid_mutex.first_waiter->list.prev->prev	5159360019465732096
PARAM_VALUE	0	trans->fs_info->tree_root->objectid_mutex.first_waiter->task->blocked_lock.owner	(-1)
PARAM_VALUE	0	trans->fs_info->tree_root->objectid_mutex.first_waiter->task->usage.refs.counter	s32min-s32max
PARAM_VALUE	0	trans->transaction	4096-ptr_max
PARAM_VALUE	0	trans->transaction->aborted	s32min-(-27),(-17),(-12),(-5),(-2),0
PARAM_VALUE	0	trans->transaction->delayed_refs.qgroup_to_skip	0-18446744073709551359
PARAM_VALUE	0	trans->transaction->state	0
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->node	4096-ptr_max
PARAM_VALUE	1	root->node->lock.dep_map->name	0-255
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.osq.tail.counter	0-s32max
PARAM_VALUE	1	root->node->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.dep_map->name	0-255
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	2	buf->refs.refs.counter	(-1073741824),0-s32max
PARAM_VALUE	3	parent	0
PARAM_VALUE	4	parent_slot	0
PARAM_VALUE	5	cow_ret	7318803927856377856
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
CAPPED_DATA	1	root->node	1
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
RX_PATH
TASK_NOT_RUNNING
USER_PTR	0	trans->pending_snapshot->inherit
LOCK2		&cow->lock
LOCK2		&fs_info->reloc_mutex
HALF_LOCKED2		&dev_replace->lock_finishing_cancel_unmount
HALF_LOCKED2		&fs_info->cleaner_mutex
HALF_LOCKED2		&fs_info->subvol_sem
HALF_LOCKED2		&fs_info->transaction_kthread_mutex
HALF_LOCKED2		&pool->lock
TYPE_LOCK		(struct btrfs_fs_info)->reloc_mutex

fs/btrfs/ctree.c balance_level() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info	4096-ptr_max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->fs_info->nodesize	0-65536
PARAM_VALUE	5	cow_ret	8048741126364348416
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	4
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
LOCK2	2	&buf->lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/ctree.c balance_level() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->fs_info->nodesize	0-65536
PARAM_VALUE	4	parent_slot	1
PARAM_VALUE	5	cow_ret	3260521428358901760
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	5
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
LOCK2	2	&buf->lock
HALF_LOCKED2		&cow->lock
HALF_LOCKED2		&left->lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/ctree.c btrfs_search_slot() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	1	root->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	3	parent	0
PARAM_VALUE	4	parent_slot	0
PARAM_VALUE	5	cow_ret	8420543843859599360
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
BUF_SIZE	2	buf	(-1),1-s32max
BUF_SIZE	2	buf	(-1),1-s32max
CAPPED_DATA	1	root	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
NO_OVERFLOW_SIMPLE	2	buf->len
NO_OVERFLOW_SIMPLE	2	buf->start
HALF_LOCKED2		&cow->lock
HALF_LOCKED2		&fs_info->commit_root_sem
HALF_LOCKED2	2	&buf->lock

fs/btrfs/ctree.c btrfs_search_slot() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	1	root->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	5	cow_ret	8420543843859599360
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
BUF_SIZE	2	buf	(-1),1-s32max
BUF_SIZE	2	buf	(-1),1-s32max
CAPPED_DATA	1	root	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
NO_OVERFLOW_SIMPLE	2	buf->len
NO_OVERFLOW_SIMPLE	2	buf->start
HALF_LOCKED2		&cow->lock
HALF_LOCKED2		&fs_info->commit_root_sem
HALF_LOCKED2	2	&buf->lock

fs/btrfs/ctree.c promote_child_to_root() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info	4096-ptr_max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->fs_info->nodesize	0-65536
PARAM_VALUE	4	parent_slot	0
PARAM_VALUE	5	cow_ret	3669651506301571072
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	1
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
DATA_SOURCE	3	parent	$4
LOCK2	2	&buf->lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/ctree.c push_leaf_left() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans->fs_info->block_group_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->block_group_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->dev_replace.rwsem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->dev_replace.rwsem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->quota_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->quota_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->remap_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->remap_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->sb->s_umount.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->sb->s_umount.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->transaction_kthread->sched_class->uclamp_enabled	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->uuid_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->uuid_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	1	root->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	1	root->fs_info->sb->s_cop->inode_info_offs	1632,1720,1808,2632,2648,2712
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->fs_info	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	5	cow_ret	171316922159472640
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	4
BUF_SIZE	0	trans	(-1)-s32max
BUF_SIZE	0	trans	(-1)-s32max
BUF_SIZE	0	trans->block_rsv	(-1),120
BUF_SIZE	0	trans->pending_snapshot	(-1),208
CAPPED_DATA	1	root	1
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
STR_LEN	0	trans	(-1)-1010101
STR_LEN	0	trans	(-1)-1010101
RX_PATH
TASK_NOT_RUNNING
NO_OVERFLOW_SIMPLE	0	trans->fs_info->chunk_root->dirty_log_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->chunk_root->dirty_log_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->stripe_root->dirty_log_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->stripe_root->dirty_log_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->tree_root->dirty_log_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->tree_root->dirty_log_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	1	root->dirty_log_pages.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	1	root->node->start
USER_PTR	0	trans->pending_snapshot->inherit
LOCK2	2	&buf->lock
HALF_LOCKED2	0	&trans->fs_info->commit_root_sem
HALF_LOCKED2	0	&trans->fs_info->fs_devices->device_list_mutex
HALF_LOCKED2	0	&trans->fs_info->fs_roots_radix_lock
HALF_LOCKED2	0	&trans->fs_info->qgroup_ioctl_lock
HALF_LOCKED2	0	&trans->fs_info->qgroup_lock
HALF_LOCKED2	0	&trans->fs_info->unused_bg_unpin_mutex
HALF_LOCKED2	0	&trans->transaction->delayed_refs.lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/ctree.c push_leaf_right() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans->fs_info->block_group_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->block_group_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->chunk_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->dev_replace.rwsem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->dev_replace.rwsem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->dev_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->quota_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->quota_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->remap_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->remap_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->sb->s_umount.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->sb->s_umount.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->stripe_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->transaction_kthread->sched_class->uclamp_enabled	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->uuid_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->uuid_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info->btree_inode->i_mapping->host->i_sb->s_export_op->fh_to_dentry	0,8684,447817974243774464,687732489194512384,742201802719268864,868497899885588480,1471448175530500096,2021658383390310400,2445877819203563520,2512819722689847296,2649270699546726400,2761259683714371584,2893332316235677696-s64max
PARAM_VALUE	1	root->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	1	root->fs_info->sb->s_cop->inode_info_offs	1632,1720,1808,2632,2648,2712
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	1	root->node->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->fs_info	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	4	parent_slot	(-2147483647)-(-1)
PARAM_VALUE	5	cow_ret	1017153875230310400
PARAM_VALUE	6	nest	5
BUF_SIZE	0	trans	(-1)-s32max
BUF_SIZE	0	trans	(-1)-s32max
BUF_SIZE	0	trans->block_rsv	(-1),120
BUF_SIZE	0	trans->pending_snapshot	(-1),208
CAPPED_DATA	1	root	1
CAPPED_DATA	4	parent_slot	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
STR_LEN	0	trans	(-1)-1010101
STR_LEN	0	trans	(-1)-1010101
RX_PATH
TASK_NOT_RUNNING
NO_OVERFLOW_SIMPLE	0	trans->fs_info->chunk_root->dirty_log_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->chunk_root->dirty_log_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->stripe_root->dirty_log_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->stripe_root->dirty_log_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->tree_root->dirty_log_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->fs_info->tree_root->dirty_log_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	0	trans->transaction->dirty_pages.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->disk_i_size
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	0	trans->transaction->pinned_extents.inode->vfs_inode.i_size
NO_OVERFLOW_SIMPLE	1	root->dirty_log_pages.inode->vfs_inode.i_bytes
NO_OVERFLOW_SIMPLE	1	root->node->start
USER_PTR	0	trans->pending_snapshot->inherit
LOCK2	2	&buf->lock
HALF_LOCKED2	0	&trans->fs_info->commit_root_sem
HALF_LOCKED2	0	&trans->fs_info->fs_devices->device_list_mutex
HALF_LOCKED2	0	&trans->fs_info->fs_roots_radix_lock
HALF_LOCKED2	0	&trans->fs_info->qgroup_ioctl_lock
HALF_LOCKED2	0	&trans->fs_info->qgroup_lock
HALF_LOCKED2	0	&trans->fs_info->unused_bg_unpin_mutex
HALF_LOCKED2	0	&trans->transaction->delayed_refs.lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/ctree.c push_nodes_for_insert() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	1	root->fs_info	4096-ptr_max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->fs_info->nodesize	0-65536
PARAM_VALUE	5	cow_ret	1184515826651869184
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	4
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
LOCK2	2	&buf->lock
TYPE_LOCK		(struct extent_buffer)->lock

fs/btrfs/ctree.c push_nodes_for_insert() -> btrfs_cow_block()

Type	Parameter	Key	Value
PARAM_VALUE	0	trans	4096-ptr_max
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->commit_root_sem.first_waiter->type	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->handoff_set	0-1
PARAM_VALUE	0	trans->fs_info->tree_root->node->lock.first_waiter->type	0-1
PARAM_VALUE	1	root	4096-ptr_max
PARAM_VALUE	2	buf	4096-ptr_max
PARAM_VALUE	2	buf->lock.first_waiter->list.next	2624917664208203776
PARAM_VALUE	2	buf->lock.first_waiter->type	0-1
PARAM_VALUE	2	buf->lock.osq.tail.counter	0-s32max
PARAM_VALUE	3	parent	4096-ptr_max
PARAM_VALUE	3	parent->fs_info->nodesize	0-65536
PARAM_VALUE	4	parent_slot	1
PARAM_VALUE	5	cow_ret	4217277494072836096
PARAM_VALUE	5	*cow_ret	4096-ptr_max
PARAM_VALUE	6	nest	5
CAPPED_DATA	2	buf	1
DATA_SOURCE	0	trans	$0
DATA_SOURCE	1	root	$1
DATA_SOURCE	2	buf	r btrfs_read_node_slot
LOCK2	2	&buf->lock
HALF_LOCKED2		&cow->lock
TYPE_LOCK		(struct extent_buffer)->lock