f2fs: fix to avoid potential race on sbi->unusable_block_count access/update
Use sbi.stat_lock to protect sbi->unusable_block_count accesss/udpate, in
order to avoid potential race on it.
Signed-off-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 8388d2a..8dee063 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2169,8 +2169,11 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
* before, we must track that to know how much space we
* really have.
*/
- if (f2fs_test_bit(offset, se->ckpt_valid_map))
+ if (f2fs_test_bit(offset, se->ckpt_valid_map)) {
+ spin_lock(&sbi->stat_lock);
sbi->unusable_block_count++;
+ spin_unlock(&sbi->stat_lock);
+ }
}
if (f2fs_test_and_clear_bit(offset, se->discard_map))
