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| author | Chao Yu <yuchao0@huawei.com> | 2019-05-05 11:40:46 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-05-08 21:23:13 -0700 |
| commit | c9c8ed50d94c613fc3f4917c51e9c75d493a312e (patch) | |
| tree | 161bfa38f995f3fceae4c60d4d9ba1f85384a7f2 /fs/f2fs/super.c | |
| parent | d764834378a9870ca56e9b2977ea46e9911ec358 (diff) | |
| download | linux-rt-c9c8ed50d94c613fc3f4917c51e9c75d493a312e.tar.gz | |
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 <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/super.c')
| -rw-r--r-- | fs/f2fs/super.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index fe075aa12893..7ddf0d3cbece 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1226,10 +1226,13 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf) buf->f_blocks = total_count - start_count; buf->f_bfree = user_block_count - valid_user_blocks(sbi) - sbi->current_reserved_blocks; + + spin_lock(&sbi->stat_lock); if (unlikely(buf->f_bfree <= sbi->unusable_block_count)) buf->f_bfree = 0; else buf->f_bfree -= sbi->unusable_block_count; + spin_unlock(&sbi->stat_lock); if (buf->f_bfree > F2FS_OPTION(sbi).root_reserved_blocks) buf->f_bavail = buf->f_bfree - @@ -1508,7 +1511,10 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi) if (err) goto out_unlock; + spin_lock(&sbi->stat_lock); sbi->unusable_block_count = 0; + spin_unlock(&sbi->stat_lock); + out_unlock: mutex_unlock(&sbi->gc_mutex); restore_flag: |