| #! /bin/bash |
| # FS QA Test No. 186 |
| # |
| # Ensuring that copy on write in buffered mode works when free space |
| # is heavily fragmented. |
| # - Create two files |
| # - Reflink the odd blocks of the first file into a third file. |
| # - Reflink the even blocks of the second file into the third file. |
| # - Try to fragment the free space by allocating a huge file and |
| # punching out every other block. |
| # - CoW across the halfway mark. |
| # - Check that the files are now different where we say they're different. |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (c) 2015, 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.* $testdir |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _supported_os Linux |
| _require_scratch_reflink |
| _require_cp_reflink |
| _require_xfs_io_command "falloc" |
| _require_xfs_io_command "fpunch" |
| test $FSTYP = "btrfs" && _notrun "Can't fragment free space on btrfs." |
| |
| rm -f $seqres.full |
| |
| _fragment_freesp() |
| { |
| file=$1 |
| |
| # consume nearly all available space (leave ~1MB) |
| avail=`_get_available_space $SCRATCH_MNT` |
| echo "$avail bytes left" |
| filesize=$((avail - 1048576)) |
| $XFS_IO_PROG -fc "truncate $filesize" $file |
| |
| chunks=20 |
| chunksizemb=$((filesize / chunks / 1048576)) |
| seq 1 $chunks | while read f; do |
| echo "$((f * chunksizemb)) file size $f / 20" |
| $XFS_IO_PROG -fc "falloc -k $(( (f - 1) * chunksizemb))m ${chunksizemb}m" $file |
| done |
| |
| chunks=100 |
| chunksizemb=$((filesize / chunks / 1048576)) |
| seq 80 $chunks | while read f; do |
| echo "$((f * chunksizemb)) file size $f / $chunks" |
| $XFS_IO_PROG -fc "falloc -k $(( (f - 1) * chunksizemb))m ${chunksizemb}m" $file |
| done |
| |
| filesizemb=$((filesize / 1048576)) |
| $XFS_IO_PROG -fc "falloc -k 0 ${filesizemb}m" $file |
| |
| # Try again anyway |
| avail=`_get_available_space $SCRATCH_MNT` |
| $XFS_IO_PROG -fc "pwrite -S 0x65 0 $avail" ${file} |
| |
| # Punch out whatever we need |
| seq 1 $((nr * 4)) | while read f; do |
| $XFS_IO_PROG -f -c "fpunch $((f * 2 * blksz)) $blksz" $file |
| done |
| } |
| |
| echo "Format and mount" |
| _scratch_mkfs > $seqres.full 2>&1 |
| _scratch_mount >> $seqres.full 2>&1 |
| |
| testdir=$SCRATCH_MNT/test-$seq |
| mkdir $testdir |
| |
| echo "Create the original files" |
| blksz=65536 |
| nr=1024 |
| filesize=$((blksz * nr)) |
| _pwrite_byte 0x61 0 $filesize $testdir/file1 >> $seqres.full |
| _pwrite_byte 0x62 0 $filesize $testdir/file2 >> $seqres.full |
| seq 0 2 $((nr-1)) | while read f; do |
| _reflink_range $testdir/file1 $((blksz * f)) $testdir/file3 $((blksz * f)) $blksz >> $seqres.full |
| _pwrite_byte 0x61 $((blksz * f)) $blksz $testdir/file3.chk >> $seqres.full |
| done |
| seq 1 2 $((nr-1)) | while read f; do |
| _reflink_range $testdir/file2 $((blksz * f)) $testdir/file3 $((blksz * f)) $blksz >> $seqres.full |
| _pwrite_byte 0x62 $((blksz * f)) $blksz $testdir/file3.chk >> $seqres.full |
| done |
| _scratch_cycle_mount |
| _fragment_freesp $testdir/bigfile >> $seqres.full 2>&1 |
| filesize=$((blksz * nr)) |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file2 | _filter_scratch |
| md5sum $testdir/file3 | _filter_scratch |
| md5sum $testdir/file3.chk | _filter_scratch |
| |
| echo "CoW with multiple extents?" |
| cowoff=$((filesize / 4)) |
| cowsz=$((filesize / 2)) |
| $XFS_IO_PROG -f -c "pwrite -S 0x63 -b $cowsz $cowoff $cowsz" $testdir/file3 >> $seqres.full |
| _pwrite_byte 0x63 $cowoff $cowsz $testdir/file3.chk >> $seqres.full |
| _scratch_cycle_mount |
| |
| echo "Compare files" |
| md5sum $testdir/file1 | _filter_scratch |
| md5sum $testdir/file2 | _filter_scratch |
| md5sum $testdir/file3 | _filter_scratch |
| md5sum $testdir/file3.chk | _filter_scratch |
| |
| # success, all done |
| status=0 |
| exit |