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 delalloc, some not.
9 # - Set cowextsize hint.
11 # - Reflink the odd blocks of the first file into the second file.
12 # - Buffered write the even blocks of the second file.
13 # - CoW across the halfway mark, starting with the unwritten extent.
14 # - Check that the files are now different where we say they're different.
17 seqres=$RESULT_DIR/$seq
18 echo "QA output created by $seq"
22 status=1 # failure is the default!
23 trap "_cleanup; exit \$status" 0 1 2 3 15
31 # get standard environment, filters and checks
36 # real QA test starts here
37 _require_scratch_reflink
38 _require_xfs_io_command "falloc"
39 _require_xfs_io_command "cowextsize"
43 echo "Format and mount"
44 _scratch_mkfs > $seqres.full 2>&1
45 _scratch_mount >> $seqres.full 2>&1
47 testdir=$SCRATCH_MNT/test-$seq
50 echo "Create the original files"
53 filesize=$((blksz * nr))
54 real_blksz=$(_get_block_size $testdir)
55 internal_blks=$((filesize / real_blksz))
56 $XFS_IO_PROG -c "cowextsize $((blksz * 16))" $testdir >> $seqres.full
57 _weave_reflink_holes $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
61 md5sum $testdir/file1 | _filter_scratch
62 md5sum $testdir/file3 | _filter_scratch
63 md5sum $testdir/file3.chk | _filter_scratch
65 echo "CoW across the transition"
66 cowoff=$((filesize / 4))
67 cowsz=$((filesize / 2))
68 _weave_reflink_holes_delalloc $blksz $nr $testdir/file3 >> $seqres.full
69 $XFS_IO_PROG -f -c "pwrite -S 0x63 -b $cowsz $cowoff $cowsz" $testdir/file3 >> $seqres.full
70 _pwrite_byte 0x63 $cowoff $cowsz $testdir/file3.chk >> $seqres.full
74 md5sum $testdir/file1 | _filter_scratch
75 md5sum $testdir/file3 | _filter_scratch
76 md5sum $testdir/file3.chk | _filter_scratch
78 echo "Check extent counts"
79 old_extents=$(_count_extents $testdir/file1)
80 new_extents=$(_count_extents $testdir/file3)
82 echo "old extents: $old_extents" >> $seqres.full
83 echo "new extents: $new_extents" >> $seqres.full
84 echo "maximum extents: $internal_blks" >> $seqres.full
85 test $((new_extents - (nr / 2))) -lt $((internal_blks / 2)) || echo "file3 badly fragmented"