2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
7 # Test read around EOF. If the file offset is at or past the end of file,
8 # no bytes are read, and read() returns zero. There was a bug, when DIO
9 # read offset is just past the EOF a little, but in the same block with
10 # EOF, read returns different negative values.
12 # The following two kernel commits fixed this bug:
13 # 74cedf9b6c60 direct-io: Fix negative return from dio read beyond eof
14 # 2d4594acbf6d fix the regression from "direct-io: Fix negative return
15 # from dio read beyond eof"
18 _begin_fstest auto quick rw
20 # Override the default cleanup function.
28 # Import common functions.
30 # real QA test starts here
35 tfile=$TEST_DIR/testfile_${seq}
36 ssize=`_min_dio_alignment $TEST_DEV`
37 bsize=`_get_block_size $TEST_DIR`
39 # let's focus on the specific bug that only happens when $ssize <= $bsize
40 if [ $ssize -gt $((bsize/4)) ]; then
41 _notrun "Only test on sector size < half of block size"
44 rm -f $tfile 2>/dev/null
46 # check xfs_io pread result, especially for
47 # Param1: expected pread offset
48 # Param2: expected pread count
49 # Param3: expected pread return
51 # If any of above values are not as expected, the output keeps
52 # using the real value
59 $AWK_PROG -v ret="$RETURN" -v cnt="$COUNT" -v off="$OFFSET" '
67 if(retval != ret || count != cnt || offset != off)
68 printf("expect [%s,%s,%s], got [%s,%s,%s]\n", \
69 off, cnt, ret, offset, count, retval)
76 # +-------------------------------------------------------+
78 # +-------------------------------------------------------+
79 # | sect | sect | sect | sect | sect | sect | sect | sect |
82 # |<--------------- move EOF -------------->| xxxxxxxxxxx |
86 # [pread4] ... [pread5]
88 # Run below steps with different $operation and $openflag
90 # 1) write 2 blocks (6 sectors) data to move EOF to the penultimate sector
91 # 2) read (pread1) the first sector within EOF
92 # 3) read (pread2) the second block contain EOF
93 # 4) read (pread3) a sector at (after) EOF
94 # 5) read (pread4) the last sector past EOF
95 # 6) read (pread5) at far away from EOF
98 tsize=$((asize - ssize * 2))
103 local op="buffer read"
105 if [ "$of" != "" ]; then
109 echo "$op the first sector within EOF"
110 $XFS_IO_PROG $of -c "pread 0 $ssize" $tfile | \
111 check_xfs_io_read 0 "$ssize" "$ssize"
113 echo "$op the second block contains EOF"
114 $XFS_IO_PROG $of -c "pread $bsize $bsize" $tfile | \
115 check_xfs_io_read "$bsize" "$bsize" "$((tsize - bsize))"
117 echo "$op a sector at (after) EOF"
118 $XFS_IO_PROG $of -c "pread $tsize $ssize" $tfile | \
119 check_xfs_io_read "$tsize" "$ssize" "0"
121 echo "$op the last sector past EOF"
122 $XFS_IO_PROG $of -c "pread $((tsize + ssize)) $ssize" $tfile | \
123 check_xfs_io_read "$((tsize + ssize))" "$ssize" "0"
125 echo "$op at far away from EOF"
126 $XFS_IO_PROG $of -c "pread $((bsize * 100)) $ssize" $tfile | \
127 check_xfs_io_read "$((bsize * 100))" "$ssize" "0"
130 # Test buffer/direct I/O read
131 $XFS_IO_PROG -ft -c "pwrite 0 ${tsize}" -c "fsync" $tfile >>$seqres.full
132 for oflag in "" "-d"; do