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| author | ChenXiaoSong <chenxiaosong2@huawei.com> | 2022-11-16 15:23:53 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-12-05 18:00:59 +0100 |
| commit | a4c853af0c511d7e0f7cb306bbc8a4f1dbdb64ca (patch) | |
| tree | 009bfe70e12df11bf237eb603a9be2f098333a8c /fs/btrfs/ctree.c | |
| parent | btrfs: add stack helpers for a few btrfs items (diff) | |
| download | linux-a4c853af0c511d7e0f7cb306bbc8a4f1dbdb64ca.tar.xz linux-a4c853af0c511d7e0f7cb306bbc8a4f1dbdb64ca.zip | |
btrfs: add might_sleep() annotations
Add annotations to functions that might sleep due to allocations or IO
and could be called from various contexts. In case of btrfs_search_slot
it's not obvious why it would sleep:
btrfs_search_slot
setup_nodes_for_search
reada_for_balance
btrfs_readahead_node_child
btrfs_readahead_tree_block
btrfs_find_create_tree_block
alloc_extent_buffer
kmem_cache_zalloc
/* allocate memory non-atomically, might sleep */
kmem_cache_alloc(GFP_NOFS|__GFP_NOFAIL|__GFP_ZERO)
read_extent_buffer_pages
submit_extent_page
/* disk IO, might sleep */
submit_one_bio
Other examples where the sleeping could happen is in 3 places might
sleep in update_qgroup_limit_item(), as shown below:
update_qgroup_limit_item
btrfs_alloc_path
/* allocate memory non-atomically, might sleep */
kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS)
Signed-off-by: ChenXiaoSong <chenxiaosong2@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/btrfs/ctree.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 76b99bcc849d..4754c9101a4c 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -184,6 +184,8 @@ size_t __attribute_const__ btrfs_get_num_csums(void) struct btrfs_path *btrfs_alloc_path(void) { + might_sleep(); + return kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS); } @@ -2046,6 +2048,8 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root, int min_write_lock_level; int prev_cmp; + might_sleep(); + lowest_level = p->lowest_level; WARN_ON(lowest_level && ins_len > 0); WARN_ON(p->nodes[0] != NULL); |