mirror of
https://github.com/linux-apfs/apfstests.git
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Theodore Ts'o
56ff01f471
The check script requires that it be run as root, so adding individualized checks for this in each teat is not needed. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
133 lines
4.6 KiB
Bash
Executable File
133 lines
4.6 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. btrfs/088
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#
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# Test that btrfs' transaction abortion does not corrupt a filesystem mounted
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# with -o discard nor allows a subsequent fstrim to corrupt the filesystem
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# (regardless of being mounted with or without -o discard).
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#
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# This issue was fixed by the following linux kernel patch:
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#
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# Btrfs: fix fs corruption on transaction abort if device supports discard
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# (commit 678886bdc6378c1cbd5072da2c5a3035000214e3)
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#
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#-----------------------------------------------------------------------
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# Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved.
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# Author: Filipe Manana <fdmanana@suse.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_fail_make_request
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SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV`
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enable_io_failure()
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{
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echo 100 > $DEBUGFS_MNT/fail_make_request/probability
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echo 1000 > $DEBUGFS_MNT/fail_make_request/times
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echo 0 > $DEBUGFS_MNT/fail_make_request/verbose
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echo 1 > $SYSFS_BDEV/make-it-fail
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}
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disable_io_failure()
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{
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echo 0 > $SYSFS_BDEV/make-it-fail
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echo 0 > $DEBUGFS_MNT/fail_make_request/probability
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echo 0 > $DEBUGFS_MNT/fail_make_request/times
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}
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rm -f $seqres.full
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# We will abort a btrfs transaction later, which always produces a warning in
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# dmesg. We do not want the test to fail because of this.
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_disable_dmesg_check
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount "-o discard"
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_require_batched_discard $SCRATCH_MNT
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# Create a file and call sync to commit our first transaction.
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$XFS_IO_PROG -f -c "pwrite -S 0xaa 0 1M" $SCRATCH_MNT/foo | _filter_xfs_io
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sync
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# Create some other file, which forces a COW operation of the fs root, adding
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# the old root location to the pinned extents list, and opens a new btrfs
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# transaction.
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touch $SCRATCH_MNT/bar
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# Write to the first file to verify later that the original data extent was not
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# a victim of a discard operation.
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$XFS_IO_PROG -c "pwrite -S 0xbb 512K 1M" $SCRATCH_MNT/foo | _filter_xfs_io
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# Now make sure the next transaction commit will abort and turn the fs readonly,
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# unmount the fs, mount it again and verify we can open file foo and read its
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# content, which should be what it had when the first transaction was committed
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# (first call to sync), since btrfs is a COW filesystem and foo was not fsynced.
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# Btrfs used to issue a discard operation on the extents in the pinned extents
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# list, resulting in corruption of metadata and data, and used too to return the
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# pinned extents to the free space caches, allowing future fstrim operations to
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# perform a discard operation against the pinned exents. This made the fs
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# unmountable because the btree roots that the superblock points at were written
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# in place (by the discard operations).
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enable_io_failure
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# This sync will trigger a commit of the current transaction, which will be
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# aborted because IO will fail for metadata extents (btree nodes/leafs).
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sync
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disable_io_failure
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touch $SCRATCH_MNT/abc >>$seqres.full 2>&1 && \
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echo "Transaction was not aborted, filesystem is not in readonly mode"
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# This fstrim operation should not cause discard operations to be performed
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# against extents that were COWed, otherwise the next mount will fail since
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# the btree roots that the superblock points at have their physical areas
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# on disk full of zeroes.
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$FSTRIM_PROG $SCRATCH_MNT
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# We expect to be able to mount the fs again and have available all metadata and
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# data that got persisted in the first transaction.
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_scratch_cycle_mount
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# We now expect file's foo content to match what it had when the first
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# transaction was committed because the second transaction was aborted and we
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# did not fsync foo.
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echo "File foo content after transaction abort + remount:"
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od -t x1 $SCRATCH_MNT/foo
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status=0
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exit
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