| #! /bin/bash |
| # FS QA Test No. 211 |
| # |
| # Test fragmentation in a big file after a lot of random CoW: |
| # - Create two reflinked files. Set extsz hint on second file. |
| # - Directio write to random offsets to scatter CoW reservations. |
| # - Rewrite the whole file to use up reservations. |
| # - Check the number of extents. |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (c) 2016, Oracle and/or its affiliates. All Rights Reserved. |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public License as |
| # published by the Free Software Foundation. |
| # |
| # This program is distributed in the hope that it would be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write the Free Software Foundation, |
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| #----------------------------------------------------------------------- |
| |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -rf $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _supported_os Linux |
| _supported_fs xfs |
| _require_scratch_reflink |
| _require_cp_reflink |
| _require_fiemap |
| _require_xfs_io_command "cowextsize" |
| _require_odirect |
| |
| rm -f $seqres.full |
| |
| echo "Format and mount" |
| _scratch_mkfs > $seqres.full 2>&1 |
| _scratch_mount >> $seqres.full 2>&1 |
| |
| testdir=$SCRATCH_MNT/test-$seq |
| mkdir $testdir |
| |
| blksz=65536 |
| nr=50000 |
| filesize=$((blksz * nr)) |
| bufnr=16 |
| bufsize=$((blksz * bufnr)) |
| |
| _require_fs_space $SCRATCH_MNT $((filesize / 1024 * 2 * 5 / 4)) |
| real_blksz=$(_get_block_size $testdir) |
| internal_blks=$((filesize / real_blksz)) |
| |
| echo "Create the original files" |
| $XFS_IO_PROG -f -c "pwrite -S 0x61 -b $bufsize 0 $((filesize + 1))" $testdir/file1 >> $seqres.full |
| $XFS_IO_PROG -f -c "cowextsize $bufsize" $testdir/file2 |
| _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file2 | _filter_scratch |
| |
| echo "CoW and unmount" |
| $XFS_IO_PROG -f -c "cowextsize" $testdir/file2 >> $seqres.full |
| $XFS_IO_PROG -d -f -c "pwrite -R -S 0x63 -b $real_blksz 0 $((filesize + 1))" $testdir/file2 >> $seqres.full |
| $XFS_IO_PROG -d -f -c "pwrite -S 0x63 -b 8388608 0 $filesize" $testdir/file2 >> $seqres.full |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file2 | _filter_scratch |
| |
| echo "Check extent counts" |
| old_extents=$(_count_extents $testdir/file1) |
| new_extents=$(_count_extents $testdir/file2) |
| |
| echo "old extents: $old_extents" >> $seqres.full |
| echo "new extents: $new_extents" >> $seqres.full |
| echo "maximum extents: $internal_blks" >> $seqres.full |
| test $new_extents -lt $((internal_blks / 20)) || test $new_extents -lt 15 \ |
| || echo "file2 badly fragmented" |
| |
| # success, all done |
| status=0 |
| exit |