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btrfs: test that send can issue clone operations within the same file
Verify that both full and incremental send operations can issue clone operations when a file has extents that are shared with itself (at different offsets of course). This currently fails on btrfs but is addressed by a patch for the kernel titled: "Btrfs: send, allow clone operations within the same file" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Filipe Manana
Eryu Guan
Executable
+122
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#! /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. 200
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#
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# Check that send operations (full and incremental) are able to issue clone
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# operations for extents that are shared between the same file.
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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 $send_files_dir
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/reflink
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. ./common/punch
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_fssum
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_require_test
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_require_scratch_reflink
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_require_xfs_io_command "fiemap"
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send_files_dir=$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 first test file, which has an extent that is shared only with
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# itself and no other files. We want to verify a full send operation will
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# clone the extent.
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$XFS_IO_PROG -f -c "pwrite -S 0xb1 -b 64K 0 64K" $SCRATCH_MNT/foo \
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| _filter_xfs_io
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$XFS_IO_PROG -c "reflink $SCRATCH_MNT/foo 0 64K 64K" $SCRATCH_MNT/foo \
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| _filter_xfs_io
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# Create out second test file which initially, for the first send operation,
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# only has a single extent that is not shared.
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$XFS_IO_PROG -f -c "pwrite -S 0xc7 -b 64K 0 64K" $SCRATCH_MNT/bar \
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| _filter_xfs_io
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$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/base 2>&1 \
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| _filter_scratch
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$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap $SCRATCH_MNT/base 2>&1 \
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| _filter_scratch
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# Now clone the existing extent in file bar to itself at a different offset.
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# We want to verify the incremental send operation below will issue a clone
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# operation instead of a write operation.
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$XFS_IO_PROG -c "reflink $SCRATCH_MNT/bar 0 64K 64K" $SCRATCH_MNT/bar \
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| _filter_xfs_io
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$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/incr 2>&1 \
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| _filter_scratch
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$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/base -f $send_files_dir/2.snap \
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$SCRATCH_MNT/incr 2>&1 | _filter_scratch
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# Compute digests of the snapshot trees so that later we can compare against
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# digests of the trees in the new filesystem, to see if they match (no data or
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# metadata corruption happened).
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$FSSUM_PROG -A -f -w $send_files_dir/base.fssum $SCRATCH_MNT/base
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$FSSUM_PROG -A -f -w $send_files_dir/incr.fssum \
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-x $SCRATCH_MNT/incr/base $SCRATCH_MNT/incr
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# Now recreate the filesystem by receiving both send streams and verify we get
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# the same file contents that the original filesystem had and that files foo
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# and bar have shared extents.
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_scratch_unmount
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT
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$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT
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# Compute digests of the snapshot trees in the new filesystem and compare them
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# to the ones in the original filesystem, they must match.
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$FSSUM_PROG -r $send_files_dir/base.fssum $SCRATCH_MNT/base
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$FSSUM_PROG -r $send_files_dir/incr.fssum $SCRATCH_MNT/incr
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num_extents=$(_count_extents $SCRATCH_MNT/base/foo)
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num_exclusive_extents=$(_count_exclusive_extents $SCRATCH_MNT/base/foo)
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if [ $num_extents -ne 2 ] || [ $num_exclusive_extents -ne 1 ]; then
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echo "File foo does not have 2 shared extents in the base snapshot"
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$XFS_IO_PROG -r -c "fiemap" $SCRATCH_MNT/base/foo
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fi
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num_extents=$(_count_extents $SCRATCH_MNT/incr/foo)
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num_exclusive_extents=$(_count_exclusive_extents $SCRATCH_MNT/incr/foo)
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if [ $num_extents -ne 2 ] || [ $num_exclusive_extents -ne 1 ]; then
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echo "File foo does not have 2 shared extents in the incr snapshot"
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$XFS_IO_PROG -r -c "fiemap" $SCRATCH_MNT/incr/foo
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fi
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num_extents=$(_count_extents $SCRATCH_MNT/incr/bar)
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num_exclusive_extents=$(_count_exclusive_extents $SCRATCH_MNT/incr/bar)
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if [ $num_extents -ne 2 ] || [ $num_exclusive_extents -ne 1 ]; then
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echo "File bar does not have 2 shared extents in the incr snapshot"
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$XFS_IO_PROG -r -c "fiemap" $SCRATCH_MNT/incr/bar
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fi
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status=0
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exit
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@@ -0,0 +1,17 @@
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QA output created by 200
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wrote 65536/65536 bytes at offset 0
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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linked 65536/65536 bytes at offset 65536
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 0
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/base'
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At subvol SCRATCH_MNT/base
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linked 65536/65536 bytes at offset 65536
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/incr'
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At subvol SCRATCH_MNT/incr
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At subvol base
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At snapshot incr
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OK
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OK
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@@ -202,3 +202,4 @@
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197 auto quick volume
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198 auto quick volume
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199 auto quick trim
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200 auto quick send clone
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