As posix standard, if the file offset is at or past the end of file,
no bytes are read, and read() returns zero.
This case reads from range within EOF, past EOF and at EOF, to make
sure the return value as expected, especially read from past/at EOF
returns 0.
Signed-off-by: Zorro Lang <zlang@xxxxxxxxxx>
---
Thanks the review from Brian!
V4 didn't change a lot, only did:
1) bring out pwrite from iteration.
2) make $oflag as a paramter of read_test
3) remove /common/filter
4) fix some typo, and improve code format
Thanks,
Zorro
tests/generic/450 | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/450.out | 11 ++++
tests/generic/group | 1 +
3 files changed, 161 insertions(+)
create mode 100755 tests/generic/450
create mode 100644 tests/generic/450.out
diff --git a/tests/generic/450 b/tests/generic/450
new file mode 100755
index 00000000..97052807
--- /dev/null
+++ b/tests/generic/450
@@ -0,0 +1,149 @@
+#! /bin/bash
+# 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.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#-----------------------------------------------------------------------
+#
+
+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 $seqres.full
+
+# real QA test starts here
+_supported_fs generic
+_supported_os Linux
+_require_test
+
+tfile=$TEST_DIR/testfile_${seq}
+ssize=`_min_dio_alignment $TEST_DEV`
+bsize=`_get_block_size $TEST_DIR`
+
+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 return
+# Param2: expected pread count
+# Param3: expected pread offset
+#
+# If any of above values are not as expected, the output keeps
+# using the real value
+check_xfs_io_read()
+{
+ RETURN=$1
+ COUNT=$2
+ OFFSET=$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", \
+ ret, cnt, off, retval, count, offset)
+
+ 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 $openflag
+#
+# 1) write 2 blocks (6 sectors) data to move EOF to the penultimate sector
+# 2) read (pread1) the first sector within EOF
+# 3) read (pread2) the second block contain EOF
+# 4) read (pread3) a sector at (after) EOF
+# 6) read (pread4) the last sector past EOF
+# 7) read (pread5) at far away from EOF
+#
+asize=$((bsize * 2))
+tsize=$((asize - ssize * 2))
+
+read_test()
+{
+ local of="$1"
+
+ echo "## pread1 $oflag ##"
+ $XFS_IO_PROG $of -c "pread 0 $ssize" $tfile | \
+ check_xfs_io_read "$ssize" "$ssize" "0"
+
+ echo "## pread2 $oflag ##"
+ $XFS_IO_PROG $of -c "pread $bsize $bsize" $tfile | \
+ check_xfs_io_read "$((tsize - bsize))" "$bsize" "$bsize"
+
+ echo "## pread3 $oflag ##"
+ $XFS_IO_PROG $of -c "pread $tsize $ssize" $tfile | \
+ check_xfs_io_read "0" "$ssize" "$tsize"
+
+ echo "## pread4 $oflag ##"
+ $XFS_IO_PROG $of -c "pread $((tsize + ssize)) $ssize" $tfile | \
+ check_xfs_io_read "0" "$ssize" "$((tsize + ssize))"
+
+ echo "## pread5 $oflag ##"
+ $XFS_IO_PROG $of -c "pread $((bsize * 100)) $ssize" $tfile | \
+ check_xfs_io_read "0" "$ssize" "$((bsize * 100))"
+}
+
+# Test buffer/direct I/O read
+$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
diff --git a/tests/generic/450.out b/tests/generic/450.out
new file mode 100644
index 00000000..ce3571bc
--- /dev/null
+++ b/tests/generic/450.out
@@ -0,0 +1,11 @@
+QA output created by 450
+## pread1 ##
+## pread2 ##
+## pread3 ##
+## pread4 ##
+## pread5 ##
+## pread1 -d ##
+## pread2 -d ##
+## pread3 -d ##
+## pread4 -d ##
+## pread5 -d ##
diff --git a/tests/generic/group b/tests/generic/group
index a04cc900..0b29be0a 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -452,3 +452,4 @@
447 auto quick clone
448 auto quick rw
449 auto quick acl enospc
+450 auto quick rw
--
2.13.3
--
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