| Message ID | 1458701355-1475-1-git-send-email-fdmanana@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On Wed, Mar 23, 2016 at 02:49:15AM +0000, fdmanana@kernel.org wrote: > From: Filipe Manana <fdmanana@suse.com> > > Test that replaying a log tree when qgroups are enabled and orphan roots > (deleted snapshots) exist, the replay process does not crash. > > This is motivated by a bug found in btrfs, introduced in the linux kernel > 4.4 release, and is fixed by the linux kernel commit 909c3a22da3b > ("Btrfs: fix loading of orphan roots leading to BUG_ON") that landed in > kernel 4.5. > > Signed-off-by: Filipe Manana <fdmanana@suse.com> Looks good to me, test passed on v4.5 kernel as expected. Reviewed-by: Eryu Guan <eguan@redhat.com> > --- > > Resending as it was missing in the last git update. > > tests/btrfs/119 | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > tests/btrfs/119.out | 9 ++++ > tests/btrfs/group | 1 + > 3 files changed, 126 insertions(+) > create mode 100755 tests/btrfs/119 > create mode 100644 tests/btrfs/119.out > > diff --git a/tests/btrfs/119 b/tests/btrfs/119 > new file mode 100755 > index 0000000..cf07550 > --- /dev/null > +++ b/tests/btrfs/119 > @@ -0,0 +1,116 @@ > +#! /bin/bash > +# FSQA Test No. 119 > +# > +# Test log tree replay when qgroups are enabled and orphan roots (deleted > +# snapshots) exist. > +# > +#----------------------------------------------------------------------- > +# > +# Copyright (C) 2016 SUSE Linux Products GmbH. All Rights Reserved. > +# Author: Filipe Manana <fdmanana@suse.com> > +# > +# This program is free software; you can redistribute it and/or > +# modify it under the terms of the GNU General Public License as > +# published by the Free Software Foundation. > +# > +# This program is distributed in the hope that it would be useful, > +# but WITHOUT ANY WARRANTY; without even the implied warranty of > +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > +# GNU General Public License for more details. > +# > +# You should have received a copy of the GNU General Public License > +# along with this program; if not, write the Free Software Foundation, > +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA > +#----------------------------------------------------------------------- > +# > + > +seq=`basename $0` > +seqres=$RESULT_DIR/$seq > +echo "QA output created by $seq" > +tmp=/tmp/$$ > +status=1 # failure is the default! > +trap "_cleanup; exit \$status" 0 1 2 3 15 > + > +_cleanup() > +{ > + _cleanup_flakey > + cd / > + rm -f $tmp.* > +} > + > +# get standard environment, filters and checks > +. ./common/rc > +. ./common/filter > +. ./common/dmflakey > + > +# real QA test starts here > +_supported_fs btrfs > +_supported_os Linux > +_require_scratch > +_require_dm_target flakey > +_require_metadata_journaling $SCRATCH_DEV > + > +rm -f $seqres.full > + > +_scratch_mkfs >>$seqres.full 2>&1 > +_init_flakey > +_mount_flakey > + > +_run_btrfs_util_prog quota enable $SCRATCH_MNT > + > +# Create 2 directories with one file in one of them. > +# We use these just to trigger a transaction commit later, moving the file from > +# directory a to directory b and doing an fsync against directory a. > +mkdir $SCRATCH_MNT/a > +mkdir $SCRATCH_MNT/b > +touch $SCRATCH_MNT/a/f > +sync > + > +# Create our test file with 2 4K extents. > +$XFS_IO_PROG -f -s -c "pwrite -S 0xaa 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io > + > +# Create a snapshot and delete it. This doesn't really delete the snapshot > +# immediately, just makes it inaccessible and invisible to user space, the > +# snapshot is deleted later by a dedicated kernel thread (cleaner kthread) > +# which is woke up at the next transaction commit. > +# A root orphan item is inserted into the tree of tree roots, so that if a > +# power failure happens before the dedicated kernel thread does the snapshot > +# deletion, the next time the filesystem is mounted it resumes the snapshot > +# deletion. > +_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap > +_run_btrfs_util_prog subvolume delete $SCRATCH_MNT/snap > + > +# Now overwrite half of the extents we wrote before. Because we made a snapshpot > +# before, which isn't really deleted yet (since no transaction commit happened > +# after we did the snapshot delete request), the non overwritten extents get > +# referenced twice, once by the default subvolume and once by the snapshot. > +$XFS_IO_PROG -c "pwrite -S 0xbb 4K 8K" $SCRATCH_MNT/foobar | _filter_xfs_io > + > +# Now move file f from directory a to directory b and fsync directory a. > +# The fsync on the directory a triggers a transaction commit (because a file > +# was moved from it to another directory) and the file fsync leaves a log tree > +# with file extent items to replay. > +mv $SCRATCH_MNT/a/f $SCRATCH_MNT/a/b > +$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/a > +$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar > + > +echo "File digest before power failure:" > +md5sum $SCRATCH_MNT/foobar | _filter_scratch > + > +# Now simulate a power failure and mount the filesystem to replay the log tree. > +# After the log tree was replayed, we used to hit a BUG_ON() when processing > +# the root orphan item for the deleted snapshot. This is because when processing > +# an orphan root the code expected to be the first code inserting the root into > +# the fs_info->fs_root_radix radix tree, while in reallity it was the second > +# caller attempting to do it - the first caller was the transaction commit that > +# took place after replaying the log tree, when updating the qgroup counters. > +_flakey_drop_and_remount > + > +echo "File digest before after failure:" > +# Must match what he got before the power failure. > +md5sum $SCRATCH_MNT/foobar | _filter_scratch > + > +_unmount_flakey > + > +status=0 > +exit > diff --git a/tests/btrfs/119.out b/tests/btrfs/119.out > new file mode 100644 > index 0000000..dc48d6c > --- /dev/null > +++ b/tests/btrfs/119.out > @@ -0,0 +1,9 @@ > +QA output created by 119 > +wrote 8192/8192 bytes at offset 0 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > +wrote 8192/8192 bytes at offset 4096 > +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) > +File digest before power failure: > +6b1ddec97df32c31d595067a4392ae12 SCRATCH_MNT/foobar > +File digest before after failure: > +6b1ddec97df32c31d595067a4392ae12 SCRATCH_MNT/foobar > diff --git a/tests/btrfs/group b/tests/btrfs/group > index a2fa412..d312874 100644 > --- a/tests/btrfs/group > +++ b/tests/btrfs/group > @@ -119,3 +119,4 @@ > 116 auto quick metadata > 117 auto quick send clone > 118 auto quick snapshot metadata > +119 auto quick snapshot metadata qgroup > -- > 2.7.0.rc3 > > -- > To unsubscribe from this list: send the line "unsubscribe fstests" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/tests/btrfs/119 b/tests/btrfs/119 new file mode 100755 index 0000000..cf07550 --- /dev/null +++ b/tests/btrfs/119 @@ -0,0 +1,116 @@ +#! /bin/bash +# FSQA Test No. 119 +# +# Test log tree replay when qgroups are enabled and orphan roots (deleted +# snapshots) exist. +# +#----------------------------------------------------------------------- +# +# Copyright (C) 2016 SUSE Linux Products GmbH. All Rights Reserved. +# Author: Filipe Manana <fdmanana@suse.com> +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- +# + +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + _cleanup_flakey + cd / + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter +. ./common/dmflakey + +# real QA test starts here +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_dm_target flakey +_require_metadata_journaling $SCRATCH_DEV + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 +_init_flakey +_mount_flakey + +_run_btrfs_util_prog quota enable $SCRATCH_MNT + +# Create 2 directories with one file in one of them. +# We use these just to trigger a transaction commit later, moving the file from +# directory a to directory b and doing an fsync against directory a. +mkdir $SCRATCH_MNT/a +mkdir $SCRATCH_MNT/b +touch $SCRATCH_MNT/a/f +sync + +# Create our test file with 2 4K extents. +$XFS_IO_PROG -f -s -c "pwrite -S 0xaa 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io + +# Create a snapshot and delete it. This doesn't really delete the snapshot +# immediately, just makes it inaccessible and invisible to user space, the +# snapshot is deleted later by a dedicated kernel thread (cleaner kthread) +# which is woke up at the next transaction commit. +# A root orphan item is inserted into the tree of tree roots, so that if a +# power failure happens before the dedicated kernel thread does the snapshot +# deletion, the next time the filesystem is mounted it resumes the snapshot +# deletion. +_run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap +_run_btrfs_util_prog subvolume delete $SCRATCH_MNT/snap + +# Now overwrite half of the extents we wrote before. Because we made a snapshpot +# before, which isn't really deleted yet (since no transaction commit happened +# after we did the snapshot delete request), the non overwritten extents get +# referenced twice, once by the default subvolume and once by the snapshot. +$XFS_IO_PROG -c "pwrite -S 0xbb 4K 8K" $SCRATCH_MNT/foobar | _filter_xfs_io + +# Now move file f from directory a to directory b and fsync directory a. +# The fsync on the directory a triggers a transaction commit (because a file +# was moved from it to another directory) and the file fsync leaves a log tree +# with file extent items to replay. +mv $SCRATCH_MNT/a/f $SCRATCH_MNT/a/b +$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/a +$XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar + +echo "File digest before power failure:" +md5sum $SCRATCH_MNT/foobar | _filter_scratch + +# Now simulate a power failure and mount the filesystem to replay the log tree. +# After the log tree was replayed, we used to hit a BUG_ON() when processing +# the root orphan item for the deleted snapshot. This is because when processing +# an orphan root the code expected to be the first code inserting the root into +# the fs_info->fs_root_radix radix tree, while in reallity it was the second +# caller attempting to do it - the first caller was the transaction commit that +# took place after replaying the log tree, when updating the qgroup counters. +_flakey_drop_and_remount + +echo "File digest before after failure:" +# Must match what he got before the power failure. +md5sum $SCRATCH_MNT/foobar | _filter_scratch + +_unmount_flakey + +status=0 +exit diff --git a/tests/btrfs/119.out b/tests/btrfs/119.out new file mode 100644 index 0000000..dc48d6c --- /dev/null +++ b/tests/btrfs/119.out @@ -0,0 +1,9 @@ +QA output created by 119 +wrote 8192/8192 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +wrote 8192/8192 bytes at offset 4096 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +File digest before power failure: +6b1ddec97df32c31d595067a4392ae12 SCRATCH_MNT/foobar +File digest before after failure: +6b1ddec97df32c31d595067a4392ae12 SCRATCH_MNT/foobar diff --git a/tests/btrfs/group b/tests/btrfs/group index a2fa412..d312874 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -119,3 +119,4 @@ 116 auto quick metadata 117 auto quick send clone 118 auto quick snapshot metadata +119 auto quick snapshot metadata qgroup