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Make test 141 work on 64k page size machines

Make the file larger and read 64k from it instead of 16k
so that it pulls in a full page from the middle of the file.
Merge of master-melb:xfs-cmds:30703a by kenmcd.

  Use a large file and 64k I/O size so the test works on 64k page
  size machines.

#! /bin/sh
# FSQA Test No. 141
#
# Test for xfs_io mmap read problem
#
#-----------------------------------------------------------------------
#  Copyright (c) 2006 Silicon Graphics, Inc.  All Rights Reserved.
#-----------------------------------------------------------------------
#
# creator
owner=bnaujok@sgi.com

seq=`basename $0`
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()
{
    _cleanup_testdir
}

# get standard environment, filters and checks
. ./common.rc
. ./common.filter

# real QA test starts here
_supported_fs xfs
_supported_os Linux

_setup_testdir
_require_scratch
_scratch_mkfs_xfs >/dev/null 2>&1
_scratch_mount

# create file, mmap a region and mmap read it
file=$SCRATCH_MNT/mmap

xfs_io -f -c "pwrite 0 1024k" -c "mmap 64k 64k" -c "mread -r" $file > /dev/null

rm -f $file

status=0
exit