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Filipe Manana
18562c4228
Test that if we have a subvolume/snapshot that is writable, has a file with unflushed delalloc (buffered writes not yet flushed), turn the subvolume to readonly mode and then use it for send a operation, the send stream will contain the delalloc data - that is, no data loss happens. This currently files on btrfs (data loss) but is fixed by a patch for the linux kernel titled: "Btrfs: send, flush dellaloc in order to avoid data loss" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
74 lines
1.8 KiB
Bash
Executable File
74 lines
1.8 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved.
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#
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# FS QA Test No. 186
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#
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# Test that if we have a subvolume/snapshot that is writable, has a file with
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# unflushed delalloc (buffered writes not yet flushed), turn the subvolume to
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# readonly mode and then use it for send a operation, the send stream will
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# contain the delalloc data - that is, no data loss happens.
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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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cd /
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rm -f $tmp.*
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rm -fr $send_files_dir
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_test
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_require_scratch
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_require_btrfs_command "property"
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send_files_dir=$TEST_DIR/btrfs-test-$seq
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rm -f $seqres.full
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rm -fr $send_files_dir
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mkdir $send_files_dir
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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# Create our test subvolume.
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$BTRFS_UTIL_PROG subvolume create $SCRATCH_MNT/sv | _filter_scratch
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# Create our test file with some delalloc data.
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$XFS_IO_PROG -f -c "pwrite -S 0xea 0 108K" $SCRATCH_MNT/sv/foo | _filter_xfs_io
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# Turn our subvolume to RO so that it can be used for a send operation.
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$BTRFS_UTIL_PROG property set $SCRATCH_MNT/sv ro true
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# Create the send stream.
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$BTRFS_UTIL_PROG send -f $send_files_dir/sv.send $SCRATCH_MNT/sv 2>&1 \
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| _filter_scratch
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echo "File content in the original filesystem:"
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od -t x1 -A d $SCRATCH_MNT/sv/foo
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# Recreate the filesystem and apply the send stream and verify no data was lost.
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_scratch_unmount
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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$BTRFS_UTIL_PROG receive -f $send_files_dir/sv.send $SCRATCH_MNT
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echo "File content in the new filesystem:"
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od -t x1 -A d $SCRATCH_MNT/sv/foo
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status=0
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exit
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