4 # Ensuring that copy on write in buffered mode works when the CoW
5 # range originally covers multiple extents, some unwritten, some not.
6 # - Set cowextsize hint.
7 # - Create a file and fallocate a second file.
8 # - Reflink the odd blocks of the first file into the second file.
9 # - CoW across the halfway mark, starting with the unwritten extent.
10 # - Check that the files are now different where we say they're different.
12 #-----------------------------------------------------------------------
13 # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
15 # This program is free software; you can redistribute it and/or
16 # modify it under the terms of the GNU General Public License as
17 # published by the Free Software Foundation.
19 # This program is distributed in the hope that it would be useful,
20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 # GNU General Public License for more details.
24 # You should have received a copy of the GNU General Public License
25 # along with this program; if not, write the Free Software Foundation,
26 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #-----------------------------------------------------------------------
30 seqres=$RESULT_DIR/$seq
31 echo "QA output created by $seq"
35 status=1 # failure is the default!
36 trap "_cleanup; exit \$status" 0 1 2 3 15
44 # get standard environment, filters and checks
49 # real QA test starts here
51 _require_scratch_reflink
52 _require_xfs_io_command "falloc"
53 _require_xfs_io_command "cowextsize"
57 echo "Format and mount"
58 _scratch_mkfs > $seqres.full 2>&1
59 _scratch_mount >> $seqres.full 2>&1
61 testdir=$SCRATCH_MNT/test-$seq
64 echo "Create the original files"
67 filesize=$((blksz * nr))
68 real_blksz=$(_get_block_size $testdir)
69 internal_blks=$((filesize / real_blksz))
70 $XFS_IO_PROG -c "cowextsize $((blksz * 16))" $testdir >> $seqres.full
71 _weave_reflink_unwritten $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
75 md5sum $testdir/file1 | _filter_scratch
76 md5sum $testdir/file3 | _filter_scratch
77 md5sum $testdir/file3.chk | _filter_scratch
79 echo "CoW across the transition"
80 cowoff=$((filesize / 4))
81 cowsz=$((filesize / 2))
82 $XFS_IO_PROG -f -c "pwrite -S 0x63 -b $cowsz $cowoff $cowsz" $testdir/file3 >> $seqres.full
83 _pwrite_byte 0x63 $cowoff $cowsz $testdir/file3.chk >> $seqres.full
87 md5sum $testdir/file1 | _filter_scratch
88 md5sum $testdir/file3 | _filter_scratch
89 md5sum $testdir/file3.chk | _filter_scratch
91 echo "Check extent counts"
92 old_extents=$(_count_extents $testdir/file1)
93 new_extents=$(_count_extents $testdir/file3)
95 echo "old extents: $old_extents" >> $seqres.full
96 echo "new extents: $new_extents" >> $seqres.full
97 echo "maximum extents: $internal_blks" >> $seqres.full
98 test $((new_extents - (nr / 2))) -lt $((internal_blks / 2)) || echo "file3 badly fragmented"