diff options
Diffstat (limited to 'fs/btrfs/subpage.c')
| -rw-r--r-- | fs/btrfs/subpage.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c index 265b6aa1c662..29bd8c7a7706 100644 --- a/fs/btrfs/subpage.c +++ b/fs/btrfs/subpage.c @@ -292,6 +292,16 @@ bool btrfs_subpage_end_and_test_writer(const struct btrfs_fs_info *fs_info, btrfs_subpage_assert(fs_info, page, start, len); + /* + * We have call sites passing @lock_page into + * extent_clear_unlock_delalloc() for compression path. + * + * This @locked_page is locked by plain lock_page(), thus its + * subpage::writers is 0. Handle them in a special way. + */ + if (atomic_read(&subpage->writers) == 0) + return true; + ASSERT(atomic_read(&subpage->writers) >= nbits); return atomic_sub_and_test(nbits, &subpage->writers); } |