| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (c) 2015, Oracle and/or its affiliates. All Rights Reserved. |
| # |
| # FS QA Test No. 155 |
| # |
| # Ensure that CoW on all copies of a file reflinked N times increases block count |
| # - Record fs block usage (0) |
| # - Create a file and some reflink copies |
| # - Record fs block usage (1) |
| # - CoW some blocks of the copies |
| # - Record fs block usage (2) |
| # - CoW all the rest of the blocks of the copies |
| # - Compare fs block usage to (2), (1), and (0) |
| # |
| # The main difference from generic/154 is that we use zero range to execute CoW. |
| # |
| . ./common/preamble |
| _begin_fstest auto quick clone zero |
| |
| # Override the default cleanup function. |
| _cleanup() |
| { |
| cd / |
| rm -rf $tmp.* $testdir |
| } |
| |
| # Import common functions. |
| . ./common/filter |
| . ./common/reflink |
| |
| # real QA test starts here |
| _require_test_reflink |
| _require_cp_reflink |
| _require_xfs_io_command "fzero" |
| _require_odirect |
| |
| testdir=$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 "Rewrite some of the blocks" |
| $XFS_IO_PROG -f -c "fzero 0 $sz" $testdir/file2 >> $seqres.full |
| _pwrite_byte 0x63 0 $((sz / 2)) $testdir/file3 -d >> $seqres.full |
| _mwrite_byte 0x64 $((sz / 2)) $((sz / 2)) $sz $testdir/file4 >> $seqres.full |
| _test_cycle_mount |
| free_blocks2=$(stat -f $testdir -c '%f') |
| |
| echo "Rewrite all the files" |
| _pwrite_byte 0x62 0 $sz $testdir/file2 -d >> $seqres.full |
| _mwrite_byte 0x63 0 $sz $sz $testdir/file3 >> $seqres.full |
| $XFS_IO_PROG -f -c "fzero 0 $sz" $testdir/file4 >> $seqres.full |
| _test_cycle_mount |
| free_blocks3=$(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 partially CoWing some copies" $free_blocks2 $((free_blocks1 - (2 * blks))) $margin -v |
| |
| _within_tolerance "free blocks after CoWing 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 |