4 # Test fragmentation after a lot of random CoW:
5 # - Create two reflinked files. Set extsz hint on second file.
6 # - Buffered write to random offsets to scatter CoW reservations.
7 # - falloc the whole file to unshare blocks.
8 # - Check the number of extents.
10 #-----------------------------------------------------------------------
11 # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved.
13 # This program is free software; you can redistribute it and/or
14 # modify it under the terms of the GNU General Public License as
15 # published by the Free Software Foundation.
17 # This program is distributed in the hope that it would be useful,
18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 # GNU General Public License for more details.
22 # You should have received a copy of the GNU General Public License
23 # along with this program; if not, write the Free Software Foundation,
24 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 #-----------------------------------------------------------------------
28 seqres=$RESULT_DIR/$seq
29 echo "QA output created by $seq"
33 status=1 # failure is the default!
34 trap "_cleanup; exit \$status" 0 1 2 3 15
42 # get standard environment, filters and checks
47 # real QA test starts here
50 _require_scratch_reflink
53 _require_xfs_io_command "cowextsize"
54 _require_xfs_io_command "funshare"
58 echo "Format and mount"
59 _scratch_mkfs > $seqres.full 2>&1
60 _scratch_mount >> $seqres.full 2>&1
62 testdir=$SCRATCH_MNT/test-$seq
67 filesize=$((blksz * nr))
69 bufsize=$((blksz * bufnr))
71 _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
72 real_blksz=$(get_block_size $testdir)
73 internal_blks=$((filesize / real_blksz))
75 echo "Create the original files"
76 $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
77 $XFS_IO_PROG -f -c "cowextsize $bufsize" $testdir/file2
78 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
82 md5sum $testdir/file1 | _filter_scratch
83 md5sum $testdir/file2 | _filter_scratch
85 echo "CoW and unmount"
86 $XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full
87 $XFS_IO_PROG -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $((filesize + 1))" -c "fdatasync" $testdir/file2 >> $seqres.full
88 $XFS_IO_PROG -f -c "funshare 0 $((filesize + 1))" $testdir/file2 >> $seqres.full
92 md5sum $testdir/file1 | _filter_scratch
94 echo "Check extent counts"
95 old_extents=$(_count_extents $testdir/file1)
96 new_extents=$(_count_extents $testdir/file2)
98 echo "old extents: $old_extents" >> $seqres.full
99 echo "new extents: $new_extents" >> $seqres.full
100 echo "maximum extents: $internal_blks" >> $seqres.full
101 test $new_extents -lt $((internal_blks / 20)) || test $new_extents -lt 15 \
102 || echo "file2 badly fragmented"