| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (C) 2015 SUSE Linux Products GmbH. All Rights Reserved. |
| # |
| # FS QA Test No. btrfs/094 |
| # |
| # 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 |
| # |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| rm -fr $send_files_dir |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # real QA test starts here |
| _supported_fs btrfs |
| _require_scratch |
| _require_cloner |
| |
| send_files_dir=$TEST_DIR/btrfs-test-$seq |
| |
| rm -f $seqres.full |
| rm -fr $send_files_dir |
| mkdir $send_files_dir |
| |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount "-o compress" |
| |
| BLOCK_SIZE=$(_get_block_size $SCRATCH_MNT) |
| |
| # Create the file with a single extent of 32 blocks. This creates a metadata |
| # file extent item with a data start offset of 0 and a logical length of |
| # 32 blocks. |
| $XFS_IO_PROG -f -c "pwrite -S 0xaa $((16 * $BLOCK_SIZE)) $((32 * $BLOCK_SIZE))" \ |
| -c "fsync" $SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified |
| |
| # Now rewrite the block range [16, 28[ of our file. This will make |
| # the inode's metadata continue to point to the single 32 block extent |
| # we created before, but now with an extent item that points to the |
| # extent with a data start offset referring to the 28th block and a |
| # logical length of 4 blocks. |
| # That metadata file extent item is associated with the block range |
| # [44, 48[. |
| $XFS_IO_PROG -c "pwrite -S 0xbb $((16 * $BLOCK_SIZE)) $((28 * $BLOCK_SIZE))" \ |
| -c "fsync" $SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified |
| |
| |
| # Now rewrite the block range [45, 48[. This will make the inode's |
| # metadata continue to point the 32 block extent we created earlier, |
| # with a single extent item that points to it with a start offset |
| # referring to the 28th block and a logical length of 1 block. |
| # That metadata file extent item is associated with the block range |
| # [44, 45[. |
| $XFS_IO_PROG -c "pwrite -S 0xcc $((45 * $BLOCK_SIZE)) $((3 * $BLOCK_SIZE))" \ |
| -c "fsync" $SCRATCH_MNT/foo | _filter_xfs_io_blocks_modified |
| |
| _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap1 |
| |
| # Now clone that same region of the 32 block extent into a new file, so that it |
| # gets referenced twice and the incremental send operation below decides to |
| # issue a clone operation instead of copying the data. |
| touch $SCRATCH_MNT/bar |
| $CLONER_PROG -s $((44 * $BLOCK_SIZE)) -d $((44 * $BLOCK_SIZE)) -l $BLOCK_SIZE \ |
| $SCRATCH_MNT/foo $SCRATCH_MNT/bar |
| |
| _run_btrfs_util_prog subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/mysnap2 |
| |
| _run_btrfs_util_prog send -f $send_files_dir/1.snap $SCRATCH_MNT/mysnap1 |
| _run_btrfs_util_prog send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \ |
| $SCRATCH_MNT/mysnap2 |
| |
| echo "File contents in the original filesystem:" |
| echo "mysnap1/foo" |
| od -t x1 $SCRATCH_MNT/mysnap1/foo | _filter_od |
| echo "mysnap2/foo" |
| od -t x1 $SCRATCH_MNT/mysnap2/foo | _filter_od |
| echo "mysnap2/bar" |
| od -t x1 $SCRATCH_MNT/mysnap2/bar | _filter_od |
| |
| # Now recreate the filesystem by receiving both send streams and verify we get |
| # the same file contents that the original filesystem had. |
| _scratch_unmount |
| _scratch_mkfs >>$seqres.full 2>&1 |
| _scratch_mount |
| |
| _run_btrfs_util_prog receive -f $send_files_dir/1.snap $SCRATCH_MNT |
| _run_btrfs_util_prog receive -f $send_files_dir/2.snap $SCRATCH_MNT |
| |
| echo "File contents in the new filesystem:" |
| echo "mysnap1/foo" |
| od -t x1 $SCRATCH_MNT/mysnap1/foo | _filter_od |
| echo "mysnap2/foo" |
| od -t x1 $SCRATCH_MNT/mysnap2/foo | _filter_od |
| echo "mysnap2/bar" |
| od -t x1 $SCRATCH_MNT/mysnap2/bar | _filter_od |
| |
| status=0 |
| exit |