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 extsz hint on second file.
9 # - Buffered write to random offsets to scatter CoW reservations.
10 # - Rewrite the whole file to use up reservations.
11 # - Check the number of extents.
14 _begin_fstest auto quick clone
16 # Import common functions.
20 # real QA test starts here
22 _require_scratch_reflink
24 _require_xfs_io_command "fiemap"
25 _require_xfs_io_command "cowextsize"
27 echo "Format and mount"
28 _scratch_mkfs > $seqres.full 2>&1
29 _scratch_mount >> $seqres.full 2>&1
31 testdir=$SCRATCH_MNT/test-$seq
36 filesize=$((blksz * nr))
38 bufsize=$((blksz * bufnr))
40 _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
41 real_blksz=$(_get_block_size $testdir)
42 internal_blks=$((filesize / real_blksz))
44 echo "Create the original files"
45 $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
46 $XFS_IO_PROG -f -c "cowextsize $bufsize" $testdir/file2
47 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
51 md5sum $testdir/file1 | _filter_scratch
52 md5sum $testdir/file2 | _filter_scratch
54 echo "CoW and unmount"
55 $XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full
56 $XFS_IO_PROG -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $filesize" -c "fdatasync" $testdir/file2 >> $seqres.full
57 $XFS_IO_PROG -f -c "pwrite -S 0x63 -b $real_blksz 0 $((filesize + 1))" -c "fdatasync" $testdir/file2 >> $seqres.full
61 md5sum $testdir/file1 | _filter_scratch
62 md5sum $testdir/file2 | _filter_scratch
64 echo "Check extent counts"
65 old_extents=$(_count_extents $testdir/file1)
66 new_extents=$(_count_extents $testdir/file2)
68 echo "old extents: $old_extents" >> $seqres.full
69 echo "new extents: $new_extents" >> $seqres.full
70 echo "maximum extents: $internal_blks" >> $seqres.full
71 test $new_extents -lt $((internal_blks / 20)) || test $new_extents -lt 15 \
72 || echo "file2 badly fragmented"