diff options
| author | Filipe Manana <fdmanana@suse.com> | 2024-12-10 11:51:11 +0000 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2025-01-13 14:53:16 +0100 |
| commit | 88694f74f4853b01dae678fb8d5f2c46948ae620 (patch) | |
| tree | 86dc4679bfd78d5242cf6182a5874b7e3782a0cb /fs/btrfs/locking.h | |
| parent | 2747c555958448eb32fc953b28798c1b55df4e1d (diff) | |
btrfs: add assertions and comment about path expectations to btrfs_cross_ref_exist()
We should always call check_delayed_ref() with a path having a locked leaf
from the extent tree where either the extent item is located or where it
should be located in case it doesn't exist yet (when there's a pending
unflushed delayed ref to do it), as we need to lock any existing delayed
ref head while holding such leaf locked in order to avoid races with
flushing delayed references, which could make us think an extent is not
shared when it really is.
So add some assertions and a comment about such expectations to
btrfs_cross_ref_exist(), which is the only caller of check_delayed_ref().
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/locking.h')
| -rw-r--r-- | fs/btrfs/locking.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/locking.h b/fs/btrfs/locking.h index 35036b151bf5..c69e57ff804b 100644 --- a/fs/btrfs/locking.h +++ b/fs/btrfs/locking.h @@ -199,8 +199,13 @@ static inline void btrfs_assert_tree_write_locked(struct extent_buffer *eb) { lockdep_assert_held_write(&eb->lock); } +static inline void btrfs_assert_tree_read_locked(struct extent_buffer *eb) +{ + lockdep_assert_held_read(&eb->lock); +} #else static inline void btrfs_assert_tree_write_locked(struct extent_buffer *eb) { } +static inline void btrfs_assert_tree_read_locked(struct extent_buffer *eb) { } #endif void btrfs_unlock_up_safe(struct btrfs_path *path, int level); |