4 # Test fragmentation after a lot of random CoW:
5 # - Create two reflinked files.
6 # - Buffered write to random offsets to scatter CoW reservations.
7 # - Check the number of extents.
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27 seqres=$RESULT_DIR/$seq
28 echo "QA output created by $seq"
32 status=1 # failure is the default!
33 trap "_cleanup; exit \$status" 0 1 2 3 15
41 # get standard environment, filters and checks
46 # real QA test starts here
48 _require_scratch_reflink
54 echo "Format and mount"
55 _scratch_mkfs > $seqres.full 2>&1
56 _scratch_mount >> $seqres.full 2>&1
58 testdir=$SCRATCH_MNT/test-$seq
63 filesize=$((blksz * nr))
65 bufsize=$((blksz * bufnr))
67 _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
68 real_blksz=$(get_block_size $testdir)
69 internal_blks=$((filesize / real_blksz))
71 echo "Create the original files"
72 $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
73 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
77 md5sum $testdir/file1 | _filter_scratch
78 md5sum $testdir/file2 | _filter_scratch
80 echo "CoW and unmount"
81 for i in `seq 1 8`; do
82 $XFS_IO_PROG -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $filesize" -c "fdatasync" $testdir/file2 >> $seqres.full
87 md5sum $testdir/file1 | _filter_scratch
89 echo "Check extent counts"
90 old_extents=$(_count_extents $testdir/file1)
91 new_extents=$(_count_extents $testdir/file2)
93 echo "old extents: $old_extents" >> $seqres.full
94 echo "new extents: $new_extents" >> $seqres.full
95 echo "maximum extents: $internal_blks" >> $seqres.full
96 test $new_extents -lt $((internal_blks * 2 / 3)) || echo "file2 badly fragmented"