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https://github.com/linux-apfs/apfstests.git
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Dave Chinner
d5425f4db9
The "brd" kernel ram disk abuses BLKFLSBUF to mean "free all memory in the ram drive" when in fact it should mean "flush all dirty buffers to stable storage". The brd driver ignores BLKFLSBUF if there is an active reference to the block device, (e.g. a fs is mounted on it), but when a device is layered over the top of it (e.g. dm-flakey, lvm devices, etc) then the applications and filesystems hold references to the upper device, not the brd device. Hence when the upper device passes down BLKFLSBUF to brd, it removes all the pages in the brd, effectively erasing it. This causes all sorts of problems..... Fix this by black listing "/dev/ramXXX" devices from tests that require DM in some way. The _requires_sane_bdev_flush() macro is called by the _requires_dm.... checks so that we don't have to remember to add this to all new tests that use dm in some way. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
86 lines
2.5 KiB
Bash
Executable File
86 lines
2.5 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 081
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#
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# Test I/O error path by fully filling an dm snapshot.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
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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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here=`pwd`
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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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cd /
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rm -f $tmp.*
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# lvm may have umounted it on I/O error, but in case it does not
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$UMOUNT_PROG $mnt >/dev/null 2>&1
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$LVM_PROG vgremove -f $vgname >>$seqres.full 2>&1
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$LVM_PROG pvremove -f $SCRATCH_DEV >>$seqres.full 2>&1
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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 generic
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_supported_os Linux
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_require_test
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_require_scratch_nocheck
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_require_dm_snapshot
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_require_command $LVM_PROG lvm
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echo "Silence is golden"
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rm -f $seqres.full
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vgname=vg_$seq
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lvname=base_$seq
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snapname=snap_$seq
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mnt=$TEST_DIR/mnt_$seq
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mkdir -p $mnt
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# make sure there's enough disk space for 256M lv, test for 300M here in case
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# lvm uses some space for metadata
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_scratch_mkfs_sized $((300 * 1024 * 1024)) >>$seqres.full 2>&1
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$LVM_PROG vgcreate -f $vgname $SCRATCH_DEV >>$seqres.full 2>&1
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$LVM_PROG lvcreate --yes -L 256M -n $lvname $vgname >>$seqres.full 2>&1
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# _mkfs_dev exits the test on failure, this can make sure lv is created in
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# above vgcreate/lvcreate steps
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_mkfs_dev /dev/mapper/$vgname-$lvname
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# create a 4M snapshot
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$LVM_PROG lvcreate -s -L 4M -n $snapname $vgname/$lvname >>$seqres.full 2>&1 || \
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_fail "Failed to create snapshot"
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_mount /dev/mapper/$vgname-$snapname $mnt
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# write 5M data to the snapshot
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$XFS_IO_PROG -fc "pwrite 0 5m" -c fsync $mnt/testfile >>$seqres.full 2>&1
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# _check_dmesg will check for WARNINGs/BUGs in dmesg
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status=0
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exit
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