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 # - Check the number of extents.
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23 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #-----------------------------------------------------------------------
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
49 _require_scratch_reflink
52 _require_xfs_io_command "cowextsize"
56 echo "Format and mount"
57 _scratch_mkfs > $seqres.full 2>&1
58 _scratch_mount >> $seqres.full 2>&1
60 testdir=$SCRATCH_MNT/test-$seq
65 filesize=$((blksz * nr))
67 bufsize=$((blksz * bufnr))
69 _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 3 * 5 / 4))
70 real_blksz=$(stat -f -c '%S' $testdir)
71 internal_blks=$((filesize / real_blksz))
73 echo "Create the original files"
74 $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full
75 $XFS_IO_PROG -f -c "cowextsize $bufsize" $testdir/file2
76 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
80 md5sum $testdir/file1 | _filter_scratch
81 md5sum $testdir/file2 | _filter_scratch
83 echo "CoW and unmount"
84 $XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full
85 $XFS_IO_PROG -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $filesize" -c "fdatasync" $testdir/file2 >> $seqres.full
89 md5sum $testdir/file1 | _filter_scratch
91 echo "Check extent counts"
92 old_extents=$(_count_extents $testdir/file1)
93 new_extents=$(_count_extents $testdir/file2)
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 -lt $((internal_blks * 2 / 3)) || echo "file2 badly fragmented"