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btrfs/215: avoid false alert for subpage case

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[BUG]
When running btrfs/215 with 64K page size, 4K sectorsize (subpage RW
support), it fails with the following error:
btrfs/215       [failed, exit status 1]- output mismatch (see ~/xfstests-dev/results//btrfs/215.out.bad)
    --- tests/btrfs/215.out     2021-03-19 16:34:26.069634953 +0800
    +++ ~/xfstests-dev/results//btrfs/215.out.bad      2021-05-17 16:52:34.743514224 +0800
    @@ -1,2 +1,3 @@
     QA output created by 215
    -Silence is golden
    +Errors: 8 expected: 2
    +(see ~/xfstests-dev/results//btrfs/215.full for details)
    ...
    (Run 'diff -u ~/xfstests-dev/tests/btrfs/215.out ~/xfstests-dev/results//btrfs/215.out.bad'  to see the entire diff)

[CAUSE]
For subpage case, btrfs still tries to read the full page, other than
read just one sector for PAGE_SIZE == sectorsize case.

This means for the 2 sectors corrupted case, since they are in the same
page, all the errors will be reported.

[FIX]
Change the following values:
- filesize
  Now it's 8 * pagesize.

- expected error number
  Now it's 2 * sectors_per_page or 6 * sectors_per_page.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Qu Wenruo
2021-05-17 17:29:22 +08:00
committed by Eryu Guan
parent 74128e70c4
commit c8c475f155
1 changed files with 19 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/btrfs/215
+19 -6
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@@ -46,8 +46,21 @@ _scratch_mkfs > /dev/null
# blobk group
_scratch_mount -o nospace_cache
pagesize=$(get_page_size)
blocksize=$(_get_block_size $SCRATCH_MNT)
filesize=$((8*$blocksize))
# For subpage case, since we still do read in full page size, if have 8 corrupted
# sectors in one page, then even we just try to read one sector of that page,
# all 8 corruption will be reported.
# So here we chose the filesize using page size.
filesize=$((8*$pagesize))
if [ $blocksize -le $pagesize ]; then
sectors_per_page=$(($pagesize / $blocksize))
else
# We don't support multi-page sectorsize yet
_notrun "this test doesn't support sectorsize $blocksize with page size $pagesize yet"
fi
uuid=$(findmnt -n -o UUID "$SCRATCH_MNT")
if [ ! -e /sys/fs/btrfs/$uuid/bdi ]; then
@@ -64,24 +77,24 @@ echo "logical = $logical_extent physical=$physical_extent" >> $seqres.full
# corrupt first 4 blocks of file
_scratch_unmount
$XFS_IO_PROG -d -c "pwrite -S 0xaa -b $blocksize $physical_extent $((4*$blocksize))" $SCRATCH_DEV > /dev/null
$XFS_IO_PROG -d -c "pwrite -S 0xaa -b $pagesize $physical_extent $((4 * $pagesize))" $SCRATCH_DEV > /dev/null
_scratch_mount
# disable readahead to avoid skewing the counter
echo 0 > /sys/fs/btrfs/$uuid/bdi/read_ahead_kb
# buffered reads whould result in 2 errors since readahead code always submits
# at least 1 page worth of IO and it will be counted as an error as well
# buffered reads whould result in 2 * sectors_per_page errors since readahead code always submits
# at least 1 page worth of IO and it will be counted as error(s) as well
$XFS_IO_PROG -c "pread -b $filesize 0 $filesize" "$SCRATCH_MNT/foobar" > /dev/null 2>&1
errs=$($BTRFS_UTIL_PROG device stats $SCRATCH_DEV | awk '/corruption_errs/ { print $2 }')
if [ $errs -ne 2 ]; then
if [ $errs -ne $((2 * $sectors_per_page)) ]; then
_fail "Errors: $errs expected: 2"
fi
# DIO does check every sector
$XFS_IO_PROG -d -c "pread -b $filesize 0 $filesize" "$SCRATCH_MNT/foobar" > /dev/null 2>&1
errs=$($BTRFS_UTIL_PROG device stats $SCRATCH_DEV | awk '/corruption_errs/ { print $2 }')
if [ $errs -ne 6 ]; then
if [ $errs -ne $((6 * $sectors_per_page)) ]; then
_fail "Errors: $errs expected: 6"
fi