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https://github.com/linux-apfs/apfstests.git
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Darrick J. Wong
c8a13e5303
These tests examine the behavior of advanced and tricky copy on write situations. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
147 lines
4.6 KiB
Bash
Executable File
147 lines
4.6 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test No. 186
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#
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# Ensuring that copy on write in buffered mode works when free space
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# is heavily fragmented.
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# - Create two files
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# - Reflink the odd blocks of the first file into a third file.
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# - Reflink the even blocks of the second file into the third file.
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# - Try to fragment the free space by allocating a huge file and
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# punching out every other block.
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# - CoW across the halfway mark.
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# - Check that the files are now different where we say they're different.
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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_scratch_reflink
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_require_cp_reflink
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_require_xfs_io_command "falloc"
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_require_xfs_io_command "fpunch"
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test "$FSTYP" = "btrfs" && _notrun "Can't fragment free space on btrfs."
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rm -f "$seqres.full"
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_fragment_freesp()
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{
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file="$1"
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# consume nearly all available space (leave ~1MB)
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avail=`_get_available_space $SCRATCH_MNT`
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echo "$avail bytes left"
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filesize=$((avail - 1048576))
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$XFS_IO_PROG -fc "truncate $filesize" "$file"
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chunks=20
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chunksizemb=$((filesize / chunks / 1048576))
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seq 1 $chunks | while read f; do
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echo "$((f * chunksizemb)) file size $f / 20"
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$XFS_IO_PROG -fc "falloc -k $(( (f - 1) * chunksizemb))m ${chunksizemb}m" "$file"
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done
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chunks=100
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chunksizemb=$((filesize / chunks / 1048576))
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seq 80 $chunks | while read f; do
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echo "$((f * chunksizemb)) file size $f / $chunks"
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$XFS_IO_PROG -fc "falloc -k $(( (f - 1) * chunksizemb))m ${chunksizemb}m" "$file"
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done
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filesizemb=$((filesize / 1048576))
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$XFS_IO_PROG -fc "falloc -k 0 ${filesizemb}m" "$file"
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# Try again anyway
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avail=`_get_available_space $SCRATCH_MNT`
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$XFS_IO_PROG -fc "pwrite -S 0x65 0 $avail" "${file}.${i}"
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# Punch out whatever we need
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seq 1 $((NR * 4)) | while read f; do
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$XFS_IO_PROG -f -c "fpunch $((f * 2 * BLKSZ)) $BLKSZ" "$file"
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done
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}
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echo "Format and mount"
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_scratch_mkfs > "$seqres.full" 2>&1
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_scratch_mount >> "$seqres.full" 2>&1
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TESTDIR="$SCRATCH_MNT/test-$seq"
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rm -rf $TESTDIR
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mkdir $TESTDIR
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echo "Create the original files"
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BLKSZ=65536
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NR=1024
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_pwrite_byte 0x61 0 $((BLKSZ * NR)) "$TESTDIR/file1" >> "$seqres.full"
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_pwrite_byte 0x62 0 $((BLKSZ * NR)) "$TESTDIR/file2" >> "$seqres.full"
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seq 0 2 $((NR-1)) | while read f; do
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_reflink_range "$TESTDIR/file1" $((BLKSZ * f)) "$TESTDIR/file3" $((BLKSZ * f)) $BLKSZ >> "$seqres.full"
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_pwrite_byte 0x61 $((BLKSZ * f)) $BLKSZ "$TESTDIR/file3.chk" >> "$seqres.full"
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done
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seq 1 2 $NR | while read f; do
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_reflink_range "$TESTDIR/file2" $((BLKSZ * f)) "$TESTDIR/file3" $((BLKSZ * f)) $BLKSZ >> "$seqres.full"
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_pwrite_byte 0x62 $((BLKSZ * f)) $BLKSZ "$TESTDIR/file3.chk" >> "$seqres.full"
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done
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_scratch_remount
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_fragment_freesp "$TESTDIR/bigfile" >> "$seqres.full" 2>&1
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_scratch_remount
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echo "Compare files"
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md5sum "$TESTDIR/file1" | _filter_scratch
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md5sum "$TESTDIR/file2" | _filter_scratch
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md5sum "$TESTDIR/file3" | _filter_scratch
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md5sum "$TESTDIR/file3.chk" | _filter_scratch
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echo "CoW with multiple extents?"
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"$XFS_IO_PROG" -f -c "pwrite -S 0x63 -b $((BLKSZ * NR / 2)) $((BLKSZ * NR / 4)) $((BLKSZ * NR / 2))" "$TESTDIR/file3" >> "$seqres.full"
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_pwrite_byte 0x63 $((BLKSZ * NR / 4)) $((BLKSZ * NR / 2)) "$TESTDIR/file3.chk" >> "$seqres.full"
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_scratch_remount
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echo "Compare files"
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md5sum "$TESTDIR/file1" | _filter_scratch
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md5sum "$TESTDIR/file2" | _filter_scratch
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md5sum "$TESTDIR/file3" | _filter_scratch
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md5sum "$TESTDIR/file3.chk" | _filter_scratch
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echo "Check for damage"
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umount "$SCRATCH_MNT"
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_check_scratch_fs
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# success, all done
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status=0
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exit
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