| #! /bin/bash |
| # FS QA Test No. 156 |
| # |
| # Ensure that fallocate on reflinked files actually CoWs the shared blocks. |
| # - Record fs block usage (0) |
| # - Create a file and some reflink copies |
| # - Record fs block usage (1) |
| # - funshare half of one of the copies |
| # - Record fs block usage (2) |
| # - funshare all of the copies |
| # - Record fs block usage (3) |
| # - rewrite the original file |
| # - Record fs block usage (4) |
| # - Compare fs block usage of 0-4 to ensure that block usage behaves as |
| # we expect. |
| # |
| # "funshare" refers to fallocate copy-on-writing the shared blocks |
| # |
| #----------------------------------------------------------------------- |
| # 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/attr |
| . ./common/reflink |
| |
| # real QA test starts here |
| _supported_os Linux |
| _require_test_reflink |
| _require_cp_reflink |
| _require_xfs_io_command "funshare" |
| |
| rm -f $seqres.full |
| |
| testdir=$TEST_DIR/test-$seq |
| rm -rf $testdir |
| mkdir $testdir |
| |
| echo "Create the original file blocks" |
| blksz="$(_get_block_size $testdir)" |
| blks=2000 |
| margin='15%' |
| sz=$((blksz * blks)) |
| free_blocks0=$(stat -f $testdir -c '%f') |
| nr=4 |
| filesize=$((blksz * nr)) |
| _pwrite_byte 0x61 0 $sz $testdir/file1 >> $seqres.full |
| _test_cycle_mount |
| |
| echo "Create the reflink copies" |
| for i in `seq 2 $nr`; do |
| _cp_reflink $testdir/file1 $testdir/file$i |
| done |
| _test_cycle_mount |
| free_blocks1=$(stat -f $testdir -c '%f') |
| |
| echo "funshare part of a file" |
| $XFS_IO_PROG -f -c "funshare 0 $((sz / 2))" $testdir/file2 |
| _test_cycle_mount |
| |
| echo "funshare some of the copies" |
| $XFS_IO_PROG -f -c "funshare 0 $sz" $testdir/file2 |
| $XFS_IO_PROG -f -c "funshare 0 $sz" $testdir/file3 |
| _test_cycle_mount |
| free_blocks2=$(stat -f $testdir -c '%f') |
| |
| echo "funshare the rest of the files" |
| $XFS_IO_PROG -f -c "funshare 0 $sz" $testdir/file4 |
| $XFS_IO_PROG -f -c "funshare 0 $sz" $testdir/file1 |
| _test_cycle_mount |
| free_blocks3=$(stat -f $testdir -c '%f') |
| |
| echo "Rewrite the original file" |
| _pwrite_byte 0x65 0 $sz $testdir/file1 >> $seqres.full |
| _test_cycle_mount |
| free_blocks4=$(stat -f $testdir -c '%f') |
| #echo $free_blocks0 $free_blocks1 $free_blocks2 $free_blocks3 $free_blocks4 |
| |
| _within_tolerance "free blocks after reflinking" $free_blocks1 $((free_blocks0 - blks)) $margin -v |
| |
| _within_tolerance "free blocks after nocow'ing some copies" $free_blocks2 $((free_blocks1 - (2 * blks))) $margin -v |
| |
| _within_tolerance "free blocks after nocow'ing all copies" $free_blocks3 $((free_blocks2 - blks)) $margin -v |
| |
| _within_tolerance "free blocks after overwriting original" $free_blocks4 $free_blocks3 $margin -v |
| |
| _within_tolerance "free blocks after all tests" $free_blocks4 $((free_blocks0 - (4 * blks))) $margin -v |
| |
| # success, all done |
| status=0 |
| exit |