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Filipe Manana
917efe2a18
Test that an incremental send issues valid clone operations for compressed file extents. For some compressed extents, namely those referred by a file extent item with a non-zero data offset, btrfs could issue a clone operation in the send stream with an offset and length pair that were not entirely contained in the source file's range, causing the receiving side to get -EINVAL errors from the clone ioctl when attempting to perform the clone operations. This issue was fixed by the following linux kernel btrfs patch: Btrfs: incremental send, fix clone operations for compressed extents Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Dave Chinner <david@fromorbit.com>
129 lines
4.6 KiB
Bash
Executable File
129 lines
4.6 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. btrfs/094
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#
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# Test that an incremental send issues valid clone operations for compressed
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# file extents.
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#
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# For some compressed extents, namely those referred by a file extent item with
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# a non-zero data offset, btrfs could issue a clone operation in the send stream
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# with an offset and length pair that were not entirely contained in the source
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# file's range, causing the receiving side to get -EINVAL errors from the clone
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# ioctl when attempting to perform the clone operations.
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#
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# This issue was fixed by the following linux kernel btrfs patch:
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#
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# Btrfs: incremental send, fix clone operations for compressed extents
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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 -fr $send_files_dir
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# real QA test starts here
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch
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_require_cloner
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_need_to_be_root
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send_files_dir=$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 "-o compress"
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# Create the file with a single extent of 128K. This creates a metadata file
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# extent item with a data start offset of 0 and a logical length of 128K.
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$XFS_IO_PROG -f -c "pwrite -S 0xaa 64K 128K" -c "fsync" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# Now rewrite the range 64K to 112K of our file. This will make the inode's
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# metadata continue to point to the 128K extent we created before, but now
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# with an extent item that points to the extent with a data start offset of
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# 112K and a logical length of 16K.
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# That metadata file extent item is associated with the logical file offset
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# at 176K and covers the logical file range 176K to 192K.
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$XFS_IO_PROG -c "pwrite -S 0xbb 64K 112K" -c "fsync" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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# Now rewrite the range 180K to 12K. This will make the inode's metadata
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# continue to point the the 128K extent we created earlier, with a single
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# extent item that points to it with a start offset of 112K and a logical
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# length of 4K.
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# That metadata file extent item is associated with the logical file offset
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# at 176K and covers the logical file range 176K to 180K.
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$XFS_IO_PROG -c "pwrite -S 0xcc 180K 12K" -c "fsync" \
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$SCRATCH_MNT/foo | _filter_xfs_io
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_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1
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# Now clone that same region of the 128K extent into a new file, so that it
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# gets referenced twice and the incremental send operation below decides to
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# issue a clone operation instead of copying the data.
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touch $SCRATCH_MNT/bar
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$CLONER_PROG -s $((176 * 1024)) -d $((176 * 1024)) -l $((4 * 1024)) \
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$SCRATCH_MNT/foo $SCRATCH_MNT/bar
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_run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2
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_run_btrfs_util_prog send $SCRATCH_MNT/mysnap1 -f $send_files_dir/1.snap
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_run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 $SCRATCH_MNT/mysnap2 \
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-f $send_files_dir/2.snap
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echo "File digests in the original filesystem:"
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md5sum $SCRATCH_MNT/mysnap1/foo | _filter_scratch
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md5sum $SCRATCH_MNT/mysnap2/foo | _filter_scratch
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md5sum $SCRATCH_MNT/mysnap2/bar | _filter_scratch
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# Now recreate the filesystem by receiving both send streams and verify we get
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# the same file contents that the original filesystem had.
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_scratch_unmount
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_scratch_mkfs >>$seqres.full 2>&1
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_scratch_mount
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_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/1.snap
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_run_btrfs_util_prog receive $SCRATCH_MNT -f $send_files_dir/2.snap
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echo "File digests in the new filesystem:"
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md5sum $SCRATCH_MNT/mysnap1/foo | _filter_scratch
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md5sum $SCRATCH_MNT/mysnap2/foo | _filter_scratch
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md5sum $SCRATCH_MNT/mysnap2/bar | _filter_scratch
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status=0
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exit
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