@@ -1167,6 +1167,7 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
curseg = CURSEG_I(sbi, type);
mutex_lock(&curseg->curseg_mutex);
+ mutex_lock(&sit_i->sentry_lock);
/* direct_io'ed data is aligned to the segment for better performance */
if (direct_io && curseg->next_blkoff)
@@ -1181,7 +1182,6 @@ void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
*/
__add_sum_entry(sbi, type, sum);
- mutex_lock(&sit_i->sentry_lock);
__refresh_next_blkoff(sbi, curseg);
stat_inc_block_count(sbi, curseg);
In the following call stack, f2fs changes the bitmap for dirty segments and # of dirty sentries without grabbing sit_i->sentry_lock. This can result in mismatch on bitmap and # of dirty sentries, since if there are some direct_io operations. In allocate_data_block, - __allocate_new_segments - mutex_lock(&curseg->curseg_mutex); - s_ops->allocate_segment - new_curseg/change_curseg - reset_curseg - __set_sit_entry_type - __mark_sit_entry_dirty - set_bit(dirty_sentries_bitmap) - dirty_sentries++; Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> --- fs/f2fs/segment.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)