mirror of
https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Dave Chinner
cf89aed924
Fully scripted conversion, see script in initial SPDX license commit message. Signed-off-by: Dave Chinner <dchinner@redhat.com>
149 lines
3.9 KiB
Bash
Executable File
149 lines
3.9 KiB
Bash
Executable File
#! /bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
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#
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# FS QA Test 450
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#
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# Test read around EOF. If the file offset is at or past the end of file,
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# no bytes are read, and read() returns zero. There was a bug, when DIO
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# read offset is just past the EOF a little, but in the same block with
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# EOF, read returns different negative values.
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#
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# The following two kernel commits fixed this bug:
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# 74cedf9b6c60 direct-io: Fix negative return from dio read beyond eof
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# 2d4594acbf6d fix the regression from "direct-io: Fix negative return
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# from dio read beyond eof"
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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 -f $tmp.*
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rm -f $tfile
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}
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# get standard environment, filters and checks
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. ./common/rc
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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_supported_fs generic
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_supported_os Linux
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_require_test
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_require_odirect
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tfile=$TEST_DIR/testfile_${seq}
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ssize=`_min_dio_alignment $TEST_DEV`
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bsize=`_get_block_size $TEST_DIR`
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# let's focus on the specific bug that only happens when $ssize <= $bsize
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if [ $ssize -gt $((bsize/4)) ]; then
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_notrun "Only test on sector size < half of block size"
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fi
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rm -f $tfile 2>/dev/null
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# check xfs_io pread result, especially for
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# Param1: expected pread offset
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# Param2: expected pread count
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# Param3: expected pread return
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#
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# If any of above values are not as expected, the output keeps
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# using the real value
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check_xfs_io_read()
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{
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OFFSET=$1
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COUNT=$2
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RETURN=$3
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$AWK_PROG -v ret="$RETURN" -v cnt="$COUNT" -v off="$OFFSET" '
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/read/{
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split($2, bytes, "/")
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retval=bytes[1]
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count=bytes[2]
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offset=$NF
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if(retval != ret || count != cnt || offset != off)
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printf("expect [%s,%s,%s], got [%s,%s,%s]\n", \
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off, cnt, ret, offset, count, retval)
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next
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}
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'
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}
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# +-------------------------------------------------------+
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# | block | block |
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# +-------------------------------------------------------+
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# | sect | sect | sect | sect | sect | sect | sect | sect |
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# |
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# EOF
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# |<--------------- move EOF -------------->| xxxxxxxxxxx |
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# [pread1]
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# [ pread2 ]
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# [pread3]
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# [pread4] ... [pread5]
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#
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# Run below steps with different $operation and $openflag
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#
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# 1) write 2 blocks (6 sectors) data to move EOF to the penultimate sector
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# 2) read (pread1) the first sector within EOF
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# 3) read (pread2) the second block contain EOF
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# 4) read (pread3) a sector at (after) EOF
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# 5) read (pread4) the last sector past EOF
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# 6) read (pread5) at far away from EOF
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#
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asize=$((bsize * 2))
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tsize=$((asize - ssize * 2))
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read_test()
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{
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local of="$1"
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local op="buffer read"
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if [ "$of" != "" ]; then
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op="direct read"
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fi
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echo "$op the first sector within EOF"
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$XFS_IO_PROG $of -c "pread 0 $ssize" $tfile | \
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check_xfs_io_read 0 "$ssize" "$ssize"
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echo "$op the second block contains EOF"
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$XFS_IO_PROG $of -c "pread $bsize $bsize" $tfile | \
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check_xfs_io_read "$bsize" "$bsize" "$((tsize - bsize))"
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echo "$op a sector at (after) EOF"
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$XFS_IO_PROG $of -c "pread $tsize $ssize" $tfile | \
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check_xfs_io_read "$tsize" "$ssize" "0"
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echo "$op the last sector past EOF"
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$XFS_IO_PROG $of -c "pread $((tsize + ssize)) $ssize" $tfile | \
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check_xfs_io_read "$((tsize + ssize))" "$ssize" "0"
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echo "$op at far away from EOF"
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$XFS_IO_PROG $of -c "pread $((bsize * 100)) $ssize" $tfile | \
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check_xfs_io_read "$((bsize * 100))" "$ssize" "0"
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}
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# Test buffer/direct I/O read
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$XFS_IO_PROG -ft -c "pwrite 0 ${tsize}" -c "fsync" $tfile >>$seqres.full
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for oflag in "" "-d"; do
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read_test "$oflag"
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done
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# success, all done
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status=0
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exit
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