mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-25 02:09:42 +00:00
Code Issues Releases Wiki Activity

Btrfs: skip checksum verification if IO error occurs

Browse source 
Currently dio read also goes to verify checksum if -EIO has been returned,
although it usually fails on checksum, it's not necessary at all, we could
directly check if there is another copy to read.

And with this, the behavior of dio read is now consistent with that of
buffered read.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ use bool for uptodate ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-04-13 18:11:48 -07:00 committed by David Sterba
parent e3d37faba2
commit ef7cdac101
1 changed files with 8 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
fs/btrfs/inode.c
View file

@ -8180,6 +8180,7 @@ static int __btrfs_subio_endio_read(struct inode *inode,
int nr_sectors;
unsigned int pgoff;
int csum_pos;
bool uptodate = (err == 0);
int ret;
fs_info = BTRFS_I(inode)->root->fs_info;
@ -8195,12 +8196,13 @@ static int __btrfs_subio_endio_read(struct inode *inode,
pgoff = bvec.bv_offset;
next_block:
csum_pos = BTRFS_BYTES_TO_BLKS(fs_info, offset);
ret = __readpage_endio_check(inode, io_bio, csum_pos,
bvec.bv_page, pgoff, start,
sectorsize);
if (likely(!ret))
goto next;
if (uptodate) {
csum_pos = BTRFS_BYTES_TO_BLKS(fs_info, offset);
ret = __readpage_endio_check(inode, io_bio, csum_pos,
bvec.bv_page, pgoff, start, sectorsize);
if (likely(!ret))
goto next;
}
try_again:
done.uptodate = 0;
done.start = start;