On 8/9/18 5:26 PM, Filipe Manana wrote: > On Thu, Aug 9, 2018 at 8:45 AM, Qu Wenruo <wqu@xxxxxxxx> wrote: >> This bug is exposed by populating a high level qgroup, and then make it >> orphan (high level qgroup without child) > > Same comment as in the kernel patch: > > "That sentence is confusing. An orphan, by definition [1], is someone > (or something in this case) without parents. > But you mention a group without children, so that should be named > "childless" or simply say "without children". > So one part of the sentence is wrong, either what is in parenthesis or > what comes before them. > > [1] https://www.thefreedictionary.com/orphan > " > >> with old qgroup numbers, and >> finally do rescan. >> >> Normally rescan should zero out all qgroups' accounting number, but due >> to a kernel bug which won't mark orphan qgroups dirty, their on-disk >> data is not updated, thus old numbers remain and cause qgroup >> corruption. >> >> Fixed by the following kernel patch: >> "btrfs: qgroup: Dirty all qgroups before rescan" >> >> Reported-by: Misono Tomohiro <misono.tomohiro@xxxxxxxxxxxxxx> >> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx> >> --- >> tests/btrfs/170 | 82 +++++++++++++++++++++++++++++++++++++++++++++ >> tests/btrfs/170.out | 3 ++ >> tests/btrfs/group | 1 + >> 3 files changed, 86 insertions(+) >> create mode 100755 tests/btrfs/170 >> create mode 100644 tests/btrfs/170.out >> >> diff --git a/tests/btrfs/170 b/tests/btrfs/170 >> new file mode 100755 >> index 000000000000..bcf8b5c0e4f3 >> --- /dev/null >> +++ b/tests/btrfs/170 >> @@ -0,0 +1,82 @@ >> +#! /bin/bash >> +# SPDX-License-Identifier: GPL-2.0 >> +# Copyright (c) 2018 SUSE Linux Products GmbH. All Rights Reserved. >> +# >> +# FS QA Test 170 >> +# >> +# Test if btrfs can clear orphan (high level qgroup without child) qgroup's >> +# accounting numbers during rescan. >> +# Fixed by the following kernel patch: >> +# "btrfs: qgroup: Dirty all qgroups before rescan" >> +# >> +seq=`basename $0` >> +seqres=$RESULT_DIR/$seq >> +echo "QA output created by $seq" >> + >> +here=`pwd` >> +tmp=/tmp/$$ >> +status=1 # failure is the default! >> +trap "_cleanup; exit \$status" 0 1 2 3 15 >> + >> +_cleanup() >> +{ >> + cd / >> + rm -f $tmp.* >> +} >> + >> +# get standard environment, filters and checks >> +. ./common/rc >> +. ./common/filter >> + >> +# remove previous $seqres.full before test >> +rm -f $seqres.full >> + >> +# real QA test starts here >> + >> +# Modify as appropriate. >> +_supported_fs btrfs >> +_supported_os Linux >> +_require_scratch >> + >> +_scratch_mkfs > /dev/null 2>&1 >> +_scratch_mount >> + >> + >> +# Populate the fs >> +_run_btrfs_util_prog subvolume create "$SCRATCH_MNT/subvol" >> +_pwrite_byte 0xcdcd 0 1M "$SCRATCH_MNT/subvol/file1" | _filter_xfs_io > /dev/null >> + >> +# Ensure that file reach disk, so it will also appear in snapshot > > # Ensure that buffered file data is persisted, so we won't have an > empty file in the snapshot. >> +sync >> +_run_btrfs_util_prog subvolume snapshot "$SCRATCH_MNT/subvol" "$SCRATCH_MNT/snapshot" >> + >> + >> +_run_btrfs_util_prog quota enable "$SCRATCH_MNT" >> +_run_btrfs_util_prog quota rescan -w "$SCRATCH_MNT" >> + >> +# Create high level qgroup >> +_run_btrfs_util_prog qgroup create 1/0 "$SCRATCH_MNT" >> + >> +# Don't use _run_btrfs_util_prog here, as it can return 1 to info user >> +# that qgroup is marked inconsistent, this is a bug in btrfs-progs, but >> +# to ensure it will work, we just ignore the return value. > > Comment should go away IMHO. The preferred way is to call > $BTRFS_UTIL_PROG and have failures noticed > through differences in the golden output. There's no point in > mentioning something that currently doesn't work > if it's not used here. In this case, I think we still need to mention why we don't use _run_btrfs_util_progs, in fact if we use _run_btrfs_util_progs, the test will just fail due to the return value. In fact, it's a workaround and worthy noting IIRC. > >> +$BTRFS_UTIL_PROG qgroup assign "$SCRATCH_MNT/snapshot" 1/0 "$SCRATCH_MNT" >> + >> +# Above assign will mark qgroup inconsistent due to the shared extents > > assign -> assignment > >> +# between subvol/snapshot/high level qgroup, do rescan here >> +_run_btrfs_util_prog quota rescan -w "$SCRATCH_MNT" > > Use $BTRFS_UTIL_PROG directly instead, and adjust the golden output if needed. There is nothing special needed in "quota rescan". Only qgroup assign/remove could return 1 instead of 0. > >> + >> +# Now remove the qgroup relationship and make 1/0 orphan >> +# Due to the shared extent outside of 1/0, we will mark qgroup inconsistent >> +# and keep the number of qgroup 1/0 > > Missing "." at the end of the sentences. > >> +$BTRFS_UTIL_PROG qgroup remove "$SCRATCH_MNT/snapshot" 1/0 "$SCRATCH_MNT" >> + >> +# Above removal also marks qgroup inconsistent, rescan again >> +_run_btrfs_util_prog quota rescan -w "$SCRATCH_MNT" > > Use $BTRFS_UTIL_PROG directly instead, and adjust the golden output if needed. The extra warning is not outputted by rescan, it's caused by qgroup assign/remove as mentioned above. Thanks, Qu > > Thanks. > >> + >> +# After the test, btrfs check will verify qgroup numbers to catch any >> +# corruption. >> + >> +# success, all done >> +status=0 >> +exit >> diff --git a/tests/btrfs/170.out b/tests/btrfs/170.out >> new file mode 100644 >> index 000000000000..9002199e48ed >> --- /dev/null >> +++ b/tests/btrfs/170.out >> @@ -0,0 +1,3 @@ >> +QA output created by 170 >> +WARNING: quotas may be inconsistent, rescan needed >> +WARNING: quotas may be inconsistent, rescan needed >> diff --git a/tests/btrfs/group b/tests/btrfs/group >> index b616c73d09bf..339c977135c0 100644 >> --- a/tests/btrfs/group >> +++ b/tests/btrfs/group >> @@ -172,3 +172,4 @@ >> 167 auto quick replace volume >> 168 auto quick send >> 169 auto quick send >> +170 auto quick qgroup >> -- >> 2.18.0 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > >
Attachment:
signature.asc
Description: OpenPGP digital signature
