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https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Andreas Gruenbacher
d8e5df11f2
Both ext4 and xfs have a bug in the page cache scanning code for
SEEK_HOLE / SEEK_DATA in unwritten extents: the start offset isn't
taken into account when scanning a page, so seeking can fail on
filesystems with a block size less than half of the page size. For
example, the following command fails on a filesystem with a block
size of 1k:
xfs_io -f -c "falloc 0 4k" \
-c "pwrite 1k 1k" \
-c "pwrite 3k 1k" \
-c "seek -a -r 0" foo
Like with generic/436, the actual tests are added to seek_sanity_test.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
65 lines
1.7 KiB
Bash
Executable File
65 lines
1.7 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 445
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#
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# Another SEEK_DATA/SEEK_HOLE sanity test.
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Red Hat, Inc. 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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#
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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=$$
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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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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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_supported_fs generic
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_supported_os Linux
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_require_test
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_require_seek_data_hole
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BASE_TEST_FILE=$TEST_DIR/seek_sanity_testfile
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_require_test_program "seek_sanity_test"
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# Disable extent zeroing for ext4 as that change where holes are created
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if [ "$FSTYP" = "ext4" ]; then
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DEV=`_short_dev $TEST_DEV`
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echo 0 >/sys/fs/ext4/$DEV/extent_max_zeroout_kb
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fi
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_cleanup()
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{
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rm -f $tmp.* $BASE_TEST_FILE.*
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}
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$here/src/seek_sanity_test -s 17 -e 17 $BASE_TEST_FILE > $seqres.full 2>&1 ||
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_fail "seek sanity check failed!"
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# success, all done
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echo "Silence is golden"
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status=0
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exit
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