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Filipe Manana
c1537fc9f2
Test that an incremental send operation correctly issues clone operations for a file that had different parts of one of its extents cloned into itself, at different offsets, and a large part of that extent was overwritten, so all the reflinks only point to subranges of the extent. This currently fails on btrfs but is fixed by a patch for the kernel that has the following subject: "btrfs: send, fix invalid clone operations when cloning from the same file and root" Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>
110 lines
3.6 KiB
Bash
Executable File
110 lines
3.6 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2021 SUSE Linux Products GmbH. All Rights Reserved.
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#
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# FS QA Test No. btrfs/229
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#
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# Test that an incremental send operation correctly issues clone operations for
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# a file that had different parts of one of its extents cloned into itself, at
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# different offsets, and a large part of that extent was overwritten, so all the
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# reflinks only point to subranges of the extent.
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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 -fr $send_files_dir
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/reflink
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# real QA test starts here
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_supported_fs btrfs
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_require_test
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_require_scratch_reflink
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send_files_dir=$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 file with a single and large extent (1M) and with different
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# content for different file ranges that will be reflinked later.
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$XFS_IO_PROG -f \
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-c "pwrite -S 0xab 0 128K" \
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-c "pwrite -S 0xcd 128K 128K" \
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-c "pwrite -S 0xef 256K 256K" \
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-c "pwrite -S 0x1a 512K 512K" \
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$SCRATCH_MNT/foobar | _filter_xfs_io
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# Now create the base snapshot, which is going to be the parent snapshot for
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# a later incremental send.
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$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
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$SCRATCH_MNT/mysnap1 > /dev/null
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$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap \
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$SCRATCH_MNT/mysnap1 2>&1 1>/dev/null | _filter_scratch
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# Now do a series of changes to our file such that we end up with different
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# parts of the extent reflinked into different file offsets and we overwrite
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# a large part of the extent too, so no file extent items refer to that part
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# that was overwritten. This used to confuse the algorithm used by the kernel
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# to figure out which file ranges to clone, making it attempt to clone from
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# a source range starting at the current eof of the file, resulting in the
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# receiver to fail since it is an invalid clone operation.
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#
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$XFS_IO_PROG -c "reflink $SCRATCH_MNT/foobar 64K 1M 960K" \
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-c "reflink $SCRATCH_MNT/foobar 0K 512K 256K" \
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-c "reflink $SCRATCH_MNT/foobar 512K 128K 256K" \
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-c "pwrite -S 0x73 384K 640K" \
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$SCRATCH_MNT/foobar | _filter_xfs_io
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$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
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$SCRATCH_MNT/mysnap2 > /dev/null
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$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
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$SCRATCH_MNT/mysnap2 2>&1 1>/dev/null | _filter_scratch
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echo "File digest in the original filesystem:"
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_md5_checksum $SCRATCH_MNT/mysnap2/foobar
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# Now recreate the filesystem by receiving both send streams and verify we get
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# the same content that the original filesystem had.
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_scratch_unmount
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT > /dev/null
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# The receive operation below used to fail with the following error:
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#
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# ERROR: failed to clone extents to foobar: Invalid argument
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#
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# This is because the send stream included a clone operation to clone from the
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# current file eof into eof (we can't clone from eof and neither the source
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# range can overlap with the destination range), resulting in the receiver to
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# fail with -EINVAL when attempting the clone operation.
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#
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$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT > /dev/null
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# Must match what we had in the original filesystem.
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echo "File digest in the new filesystem:"
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_md5_checksum $SCRATCH_MNT/mysnap2/foobar
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status=0
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exit
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