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f2fs: fix to avoid potential race on sbi->unusable_block_count access/update

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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>
This commit is contained in:
Chao Yu
2019-05-05 11:40:46 +08:00
committed by Jaegeuk Kim
parent d764834378
commit c9c8ed50d9
3 changed files with 14 additions and 1 deletions
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6
fs/f2fs/super.c
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@@ -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: