diff options
| -rw-r--r-- | fs/btrfs/extent_io.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 77f2211550e3..19221095c635 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -203,8 +203,14 @@ void btrfs_readahead_node_child(struct extent_buffer *node, int slot); static inline int num_extent_pages(const struct extent_buffer *eb) { - return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) - - (eb->start >> PAGE_SHIFT); + /* + * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to + * sectorsize, it's just eb->len >> PAGE_SHIFT. + * + * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE, + * thus have to ensure we get at least one page. + */ + return (eb->len >> PAGE_SHIFT) ?: 1; } static inline int extent_buffer_uptodate(const struct extent_buffer *eb) |