Defined in 1 files as a prototype:

Defined in 1 files as a function:

Referenced in 2 files:

Smatch caller information:

fs/btrfs/free-space-cache.c btrfs_truncate_free_space_cache() -> btrfs_wait_cache_io()

Type Parameter Key Value
PARAM_VALUE 0 trans 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->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->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->cache_write_mutex.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->cache_write_mutex.first_waiter->list.prev->next 5159360019465732096
PARAM_VALUE 0 trans->transaction->cache_write_mutex.osq.tail.counter 0-s32max
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.owner (-1)
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.owner_cpu u32max
PARAM_VALUE 1 block_group 4096-ptr_max
PARAM_VALUE 1 block_group->fs_info 4096-ptr_max
PARAM_VALUE 1 block_group->fs_info->delayed_workers->thresh (-1)-0,32
PARAM_VALUE 1 block_group->fs_info->discard_ctl.work.wq->dfl_pwq 0-s64max
PARAM_VALUE 1 block_group->fs_info->discard_ctl.work.wq->saved_max_active s32min-s32max
PARAM_VALUE 1 block_group->fs_info->discard_ctl.work.wq->saved_min_active s32min-s32max
PARAM_VALUE 1 block_group->fs_info->global_block_rsv.lock.rlock.dep_map->name 0-255
PARAM_VALUE 1 block_group->fs_info->ro_block_group_mutex.first_waiter->list.prev->next 5159360019465732096
PARAM_VALUE 1 block_group->fs_info->tree_root->node->lock.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->fs_info->tree_root->node->lock.first_waiter->type 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->type 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_wb->dwork.wq->dfl_pwq 0-s64max
PARAM_VALUE 1 block_group->io_ctl.inode->i_wb->dwork.wq->saved_max_active s32min-s32max
PARAM_VALUE 1 block_group->io_ctl.inode->i_wb->dwork.wq->saved_min_active s32min-s32max
PARAM_VALUE 1 block_group->io_list.next->prev 4096-ptr_max
PARAM_VALUE 1 block_group->io_list.prev->next 4096-ptr_max
PARAM_VALUE 1 block_group->space_info->groups_sem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->space_info->groups_sem.first_waiter->type 0-1
PARAM_VALUE 2 path 1-u64max
CAPPED_DATA 0 &trans->transaction->cache_write_mutex 1
CAPPED_DATA 1 &block_group->io_list 1
DATA_SOURCE 0 trans $0
DATA_SOURCE 1 block_group $1
DATA_SOURCE 2 path r btrfs_alloc_path
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
LOCK2 &fs_info->cleaner_mutex
LOCK2 0 &trans->transaction->cache_write_mutex
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 btrfs_transaction)->cache_write_mutex

fs/btrfs/block-group.c btrfs_remove_block_group() -> btrfs_wait_cache_io()

Type Parameter Key Value
PARAM_VALUE 0 trans 4096-ptr_max
PARAM_VALUE 0 trans->chunk_bytes_reserved 0
PARAM_VALUE 0 trans->fs_info 4096-ptr_max
PARAM_VALUE 0 trans->fs_info->balance_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->block_group_cache_lock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->chunk_block_rsv.space_info->lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->chunk_block_rsv.space_info->tickets.prev 643370198843097104
PARAM_VALUE 0 trans->fs_info->chunk_mutex.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->chunk_mutex.first_waiter->list.prev->next 5159360019465732096
PARAM_VALUE 0 trans->fs_info->chunk_mutex.first_waiter->list.prev->prev 5159360019465732096
PARAM_VALUE 0 trans->fs_info->chunk_mutex.osq.tail.counter 0-s32max
PARAM_VALUE 0 trans->fs_info->chunk_root->accounting_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->chunk_root->dirty_list.next 4096-ptr_max
PARAM_VALUE 0 trans->fs_info->chunk_root->dirty_log_pages.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->fs_info->chunk_root->dirty_log_pages.inode->root->delalloc_root.next->prev 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->data_alloc_cluster.lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->data_alloc_cluster.refill_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->delayed_refs_rsv.full 0
PARAM_VALUE 0 trans->fs_info->fs_devices 4096-ptr_max
PARAM_VALUE 0 trans->fs_info->fs_devices->device_list_mutex.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->fs_devices->device_list_mutex.first_waiter->list.prev->next 5159360019465732096
PARAM_VALUE 0 trans->fs_info->fs_devices->device_list_mutex.first_waiter->list.prev->prev 5159360019465732096
PARAM_VALUE 0 trans->fs_info->fs_devices->device_list_mutex.osq.tail.counter 0-s32max
PARAM_VALUE 0 trans->fs_info->fs_devices->per_profile_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->global_block_rsv.full 1
PARAM_VALUE 0 trans->fs_info->global_block_rsv.reserved 0-536870912
PARAM_VALUE 0 trans->fs_info->global_block_rsv.size 0-536870912
PARAM_VALUE 0 trans->fs_info->global_block_rsv.space_info->force_alloc 2
PARAM_VALUE 0 trans->fs_info->mapping_tree_lock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->meta_alloc_cluster.lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->meta_alloc_cluster.refill_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->profiles_lock.seqcount.seqcount.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->ref_verify_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->fs_info->super_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->new_bgs.prev->next 4096-ptr_max
PARAM_VALUE 0 trans->new_bgs.prev->next->next 4096-ptr_max
PARAM_VALUE 0 trans->removing_chunk 0
PARAM_VALUE 0 trans->transaction 4096-ptr_max
PARAM_VALUE 0 trans->transaction->cache_write_mutex.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->cache_write_mutex.first_waiter->list.prev->next 5159360019465732096
PARAM_VALUE 0 trans->transaction->cache_write_mutex.osq.tail.counter 0-s32max
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.owner (-1)
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.owner_cpu u32max
PARAM_VALUE 0 trans->transaction->dirty_bgs_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->dirty_pages.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->dirty_pages.inode->root->delalloc_root.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->pinned_extents.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->pinned_extents.inode->root->delalloc_root.next->prev 4096-ptr_max
PARAM_VALUE 1 block_group 4096-ptr_max
PARAM_VALUE 1 block_group->fs_info 4096-ptr_max
PARAM_VALUE 1 block_group->fs_info->data_reloc_bg 0
PARAM_VALUE 1 block_group->fs_info->relocation_bg_lock.rlock.dep_map->name 0-255
PARAM_VALUE 1 block_group->inode 0,4096-ptr_max
PARAM_VALUE 1 block_group->io_list.next->prev 4096-ptr_max
PARAM_VALUE 1 block_group->io_list.prev->next 4096-ptr_max
PARAM_VALUE 1 block_group->lock.rlock.dep_map->name 0-255
PARAM_VALUE 2 path 1-u64max
BUF_SIZE 0 trans (-1),1-s32max
BUF_SIZE 0 trans (-1),1-s32max
CAPPED_DATA 0 &trans->transaction->cache_write_mutex 1
CAPPED_DATA 1 block_group 1
CAPPED_DATA 1 &block_group->io_list 1
DATA_SOURCE 0 trans $0
DATA_SOURCE 1 block_group r btrfs_lookup_block_group
DATA_SOURCE 2 path r btrfs_alloc_path
PREEMPT_ADD
RX_PATH
TASK_NOT_RUNNING
NOCHECK_CALL
LOCK2 0 &trans->transaction->cache_write_mutex
HALF_LOCKED2 &fs_info->reclaim_bgs_lock
TYPE_LOCK (struct btrfs_fs_info)->reclaim_bgs_lock
TYPE_LOCK (struct btrfs_transaction)->cache_write_mutex

fs/btrfs/block-group.c btrfs_start_dirty_block_groups() -> btrfs_wait_cache_io()

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->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->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->cache_write_mutex.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->cache_write_mutex.first_waiter->list.prev->next 5159360019465732096
PARAM_VALUE 0 trans->transaction->cache_write_mutex.osq.tail.counter 0-s32max
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.owner (-1)
PARAM_VALUE 0 trans->transaction->cache_write_mutex.wait_lock.owner_cpu u32max
PARAM_VALUE 0 trans->transaction->dirty_bgs_lock.rlock.dep_map->name 0-255
PARAM_VALUE 1 block_group 4096-ptr_max
PARAM_VALUE 1 block_group->data_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->data_rwsem.first_waiter->type 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->type 0-1
PARAM_VALUE 2 path 1-u64max
PARAM_VALUE 2 *path->locks 0-255
PARAM_VALUE 2 *path->slots s32min-s32max
CAPPED_DATA 0 &trans->transaction->cache_write_mutex 1
CAPPED_DATA 1 &block_group->io_list 1
DATA_SOURCE 0 trans $0
NOCHECK_CALL
LOCK2 0 &trans->transaction->cache_write_mutex
TYPE_LOCK (struct btrfs_transaction)->cache_write_mutex

fs/btrfs/block-group.c btrfs_write_dirty_block_groups() -> btrfs_wait_cache_io()

Type Parameter Key Value
PARAM_VALUE 0 trans 4096-ptr_max
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->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->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_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->fs_devices 4096-ptr_max
PARAM_VALUE 0 trans->fs_info->fs_roots_radix_lock.rlock.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->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->tree_root 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->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 0 trans->transaction->dirty_bgs_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->dirty_pages.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->dirty_pages.inode->root->delalloc_root.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->pinned_extents.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->pinned_extents.inode->root->delalloc_root.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->state 3
PARAM_VALUE 0 trans->transaction->switch_commits.prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->switch_commits.prev->next 4096-ptr_max
PARAM_VALUE 0 trans->transaction->switch_commits.prev->next->next 4096-ptr_max
PARAM_VALUE 0 trans->writeback_inhibited_ebs.xa_lock.rlock.dep_map->name 0-255
PARAM_VALUE 1 block_group 4096-ptr_max
PARAM_VALUE 1 block_group->data_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->data_rwsem.first_waiter->type 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->type 0-1
PARAM_VALUE 2 path 1-u64max
CAPPED_DATA 1 &block_group->io_list 1
DATA_SOURCE 0 trans $0
DATA_SOURCE 2 path r btrfs_alloc_path
RX_PATH
NOCHECK_CALL
HALF_LOCKED2 &cow->lock

fs/btrfs/block-group.c btrfs_write_dirty_block_groups() -> btrfs_wait_cache_io()

Type Parameter Key Value
PARAM_VALUE 0 trans 4096-ptr_max
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->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->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_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->fs_devices 4096-ptr_max
PARAM_VALUE 0 trans->fs_info->fs_roots_radix_lock.rlock.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->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->tree_root 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->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 0 trans->transaction->dirty_bgs_lock.rlock.dep_map->name 0-255
PARAM_VALUE 0 trans->transaction->dirty_pages.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->dirty_pages.inode->root->delalloc_root.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->pinned_extents.inode->delalloc_inodes.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->pinned_extents.inode->root->delalloc_root.next->prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->state 3
PARAM_VALUE 0 trans->transaction->switch_commits.prev 4096-ptr_max
PARAM_VALUE 0 trans->transaction->switch_commits.prev->next 4096-ptr_max
PARAM_VALUE 0 trans->transaction->switch_commits.prev->next->next 4096-ptr_max
PARAM_VALUE 0 trans->writeback_inhibited_ebs.xa_lock.rlock.dep_map->name 0-255
PARAM_VALUE 1 block_group 4096-ptr_max
PARAM_VALUE 1 block_group->data_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->data_rwsem.first_waiter->type 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->handoff_set 0-1
PARAM_VALUE 1 block_group->io_ctl.inode->i_mapping->i_mmap_rwsem.first_waiter->type 0-1
PARAM_VALUE 2 path 1-u64max
PARAM_VALUE 2 *path->locks 0-255
PARAM_VALUE 2 *path->slots s32min-s32max
DATA_SOURCE 0 trans $0
DATA_SOURCE 2 path r btrfs_alloc_path
RX_PATH
NOCHECK_CALL
HALF_LOCKED2 &cow->lock