mirror of
https://github.com/linux-apfs/apfstests.git
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Darrick J. Wong
6a4e8b81d9
Ensure that CoW happens correctly with buffered, directio, and mmap writes. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
92 lines
2.5 KiB
Bash
Executable File
92 lines
2.5 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 142
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#
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# Ensure that reflinking a file N times and CoWing the copies leaves the
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# original intact.
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# - Create a file and record its hash
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# - Create some reflink copies
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# - Rewrite all the reflink copies
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# - Compare the contents of the original file
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2015, Oracle and/or its affiliates. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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seq=`basename "$0"`
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seqres="$RESULT_DIR/$seq"
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -rf "$tmp".* "$TESTDIR"
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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. ./common/reflink
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# real QA test starts here
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_supported_os Linux
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_require_test_reflink
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_require_cp_reflink
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rm -f "$seqres.full"
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TESTDIR="$TEST_DIR/test-$seq"
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rm -rf "$TESTDIR"
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mkdir "$TESTDIR"
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echo "Create the original file blocks"
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BLKSZ=65536
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NR=9
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_pwrite_byte 0x61 0 $((BLKSZ * 256)) "$TESTDIR/file1" >> "$seqres.full"
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_test_remount
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md5sum "$TESTDIR/file1" | _filter_test_dir
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csum="$(_md5_checksum "$TESTDIR/file1")"
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echo "Create the reflink copies"
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seq 2 $NR | while read i; do
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_cp_reflink "$TESTDIR/file1" "$TESTDIR/file$i"
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done
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_test_remount
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echo "Rewrite the copies"
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seq 2 $NR | while read i; do
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_pwrite_byte 0x62 0 $((BLKSZ * 256)) "$TESTDIR/file$i" >> "$seqres.full"
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done
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_test_remount
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echo "Examine original file"
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md5sum "$TESTDIR/file1" | _filter_test_dir
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md5sum "$TESTDIR/file2" | _filter_test_dir
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mod_csum="$(_md5_checksum "$TESTDIR/file2")"
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new_csum="$(_md5_checksum "$TESTDIR/file1")"
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test "${csum}" != "${mod_csum}" || echo "checksums do not match"
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test "${csum}" = "${new_csum}" || echo "checksums do not match"
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# success, all done
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status=0
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exit
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