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authorNikolay Borisov <nborisov@suse.com>2018-06-27 16:38:23 +0300
committerDavid Sterba <dsterba@suse.com>2018-08-06 14:12:54 +0300
commit07e21c4dad42be8d2a6b8cd0b98cf8e6931e12fd (patch)
tree6d262c09157e3cf7c0eede5de259634a835d914f /fs/btrfs/extent_io.c
parent55ac01396ae8cfc0616e85bb4b49a130144633c2 (diff)
downloadlinux-07e21c4dad42be8d2a6b8cd0b98cf8e6931e12fd.tar.xz
btrfs: Document locking requirement via lockdep_assert_held
Remove stale comment since there is no longer an eb->eb_lock and document the locking expectation with a lockdep_assert_held statement. No functional changes. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/extent_io.c')
-rw-r--r--fs/btrfs/extent_io.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 6a4013ddcf73..5ab401f79683 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5066,9 +5066,10 @@ static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head)
__free_extent_buffer(eb);
}
-/* Expects to have eb->eb_lock already held */
static int release_extent_buffer(struct extent_buffer *eb)
{
+ lockdep_assert_held(&eb->refs_lock);
+
WARN_ON(atomic_read(&eb->refs) == 0);
if (atomic_dec_and_test(&eb->refs)) {
if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) {