2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
7 # Test fragmentation after a lot of random CoW:
8 # - Create two reflinked files. Set zero extsz hint on second file.
9 # - Buffered write to random offsets to scatter CoW reservations.
10 # - Check the number of extents.
13 seqres=$RESULT_DIR/$seq
14 echo "QA output created by $seq"
18 status=1 # failure is the default!
19 trap "_cleanup; exit \$status" 0 1 2 3 15
27 # get standard environment, filters and checks
32 # real QA test starts here
34 _require_scratch_reflink
36 _require_xfs_io_command "fiemap"
37 _require_xfs_io_command "cowextsize"
38 _require_xfs_io_command "funshare"
42 echo "Format and mount"
43 _scratch_mkfs > $seqres.full 2>&1
44 _scratch_mount >> $seqres.full 2>&1
46 testdir=$SCRATCH_MNT/test-$seq
51 filesize=$((blksz * nr))
53 bufsize=$((blksz * bufnr))
55 _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
56 real_blksz=$(_get_file_block_size $testdir)
57 internal_blks=$((filesize / real_blksz))
59 echo "Create the original files"
60 $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
61 $XFS_IO_PROG -f -c "cowextsize $real_blksz" $testdir/file2
62 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
66 md5sum $testdir/file1 | _filter_scratch
67 md5sum $testdir/file2 | _filter_scratch
69 echo "CoW and unmount"
70 $XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full
71 $XFS_IO_PROG -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $filesize" -c "fdatasync" $testdir/file2 >> $seqres.full
72 $XFS_IO_PROG -f -c "funshare 0 $filesize" $testdir/file2 >> $seqres.full
76 md5sum $testdir/file1 | _filter_scratch
78 echo "Check extent counts"
79 old_extents=$(_count_extents $testdir/file1)
80 new_extents=$(_count_extents $testdir/file2)
82 echo "old extents: $old_extents" >> $seqres.full
83 echo "new extents: $new_extents" >> $seqres.full
84 echo "maximum extents: $internal_blks" >> $seqres.full