2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
7 # Ensuring that copy on write in buffered mode works when the CoW
8 # range originally covers multiple extents, some unwritten, some not.
9 # - Set cowextsize hint.
10 # - Create a file and fallocate a second file.
11 # - Reflink the odd blocks of the first file into the second file.
12 # - CoW across the halfway mark, starting with the unwritten extent.
13 # - Check that the files are now different where we say they're different.
16 seqres=$RESULT_DIR/$seq
17 echo "QA output created by $seq"
21 status=1 # failure is the default!
22 trap "_cleanup; exit \$status" 0 1 2 3 15
30 # get standard environment, filters and checks
35 # real QA test starts here
36 _require_scratch_reflink
37 _require_xfs_io_command "falloc"
38 _require_xfs_io_command "cowextsize"
42 echo "Format and mount"
43 _scratch_mkfs > $seqres.full 2>&1
44 _scratch_mount >> $seqres.full 2>&1
46 testdir=$SCRATCH_MNT/test-$seq
49 echo "Create the original files"
52 filesize=$((blksz * nr))
53 real_blksz=$(_get_block_size $testdir)
54 internal_blks=$((filesize / real_blksz))
55 $XFS_IO_PROG -c "cowextsize $((blksz * 16))" $testdir >> $seqres.full
56 _weave_reflink_unwritten $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
60 md5sum $testdir/file1 | _filter_scratch
61 md5sum $testdir/file3 | _filter_scratch
62 md5sum $testdir/file3.chk | _filter_scratch
64 echo "CoW across the transition"
65 cowoff=$((filesize / 4))
66 cowsz=$((filesize / 2))
67 $XFS_IO_PROG -f -c "pwrite -S 0x63 -b $cowsz $cowoff $cowsz" $testdir/file3 >> $seqres.full
68 _pwrite_byte 0x63 $cowoff $cowsz $testdir/file3.chk >> $seqres.full
72 md5sum $testdir/file1 | _filter_scratch
73 md5sum $testdir/file3 | _filter_scratch
74 md5sum $testdir/file3.chk | _filter_scratch
76 echo "Check extent counts"
77 old_extents=$(_count_extents $testdir/file1)
78 new_extents=$(_count_extents $testdir/file3)
80 echo "old extents: $old_extents" >> $seqres.full
81 echo "new extents: $new_extents" >> $seqres.full
82 echo "maximum extents: $internal_blks" >> $seqres.full
83 test $((new_extents - (nr / 2))) -lt $((internal_blks / 2)) || echo "file3 badly fragmented"