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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>
hifive-unleashed-5.2
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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4
fs/f2fs/checkpoint.c
View File

@ -1536,7 +1536,11 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
clear_sbi_flag(sbi, SBI_IS_DIRTY);
clear_sbi_flag(sbi, SBI_NEED_CP);
clear_sbi_flag(sbi, SBI_QUOTA_SKIP_FLUSH);
spin_lock(&sbi->stat_lock);
sbi->unusable_block_count = 0;
spin_unlock(&sbi->stat_lock);
__set_cp_next_pack(sbi);
/*

5
fs/f2fs/segment.c
View File

@ -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))

6
fs/f2fs/super.c
View File

@ -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: