hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

btrfs: replace memset with memzero_page in data checksum verification 

The original code resets the page to 0x1 for not apparent reason, it's
been like that since the initial 2007 code added in commit 07157aacb1
("Btrfs: Add file data csums back in via hooks in the extent map code").

It could mean that a failed buffer can be detected from the data but
that's just a guess and any value is good.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2022-03-25 17:37:59 +08:00 committed by David Sterba
parent d4135134ab
commit b06660b595
1 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/btrfs/inode.c
View File

@ -3275,11 +3275,11 @@ static int check_data_csum(struct inode *inode, struct btrfs_bio *bbio,
shash->tfm = fs_info->csum_shash;
crypto_shash_digest(shash, kaddr + pgoff, len, csum);
kunmap_atomic(kaddr);
if (memcmp(csum, csum_expected, csum_size))
goto zeroit;
kunmap_atomic(kaddr);
return 0;
zeroit:
btrfs_print_data_csum_error(BTRFS_I(inode), start, csum, csum_expected,
@ -3287,9 +3287,7 @@ zeroit:
if (bbio->device)
btrfs_dev_stat_inc_and_print(bbio->device,
BTRFS_DEV_STAT_CORRUPTION_ERRS);
memset(kaddr + pgoff, 1, len);
flush_dcache_page(page);
kunmap_atomic(kaddr);
memzero_page(page, pgoff, len);
return -EIO;
}