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