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Make sure the repair tests dirty the filesystem before corrupting it.
Merge of master-melb:xfs-cmds:28770a by kenmcd.

  Make sure the repair tests dirty the filesystem before corrupting it.

##/bin/sh
#
# Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
#
# Functions useful for xfs_repair tests
#

_zero_position()
{
	value=$1
	struct="$2"

	# set values for off/len variables provided by db
	eval `xfs_db -r -c "$struct" -c stack $SCRATCH_DEV | perl -ne '
		if (/byte offset (\d+), length (\d+)/) {
			print "offset=$1\nlength=$2\n"; exit
		}'`
	if [ -z "$offset" -o -z "$length" ]; then
		echo "cannot calculate offset ($offset) or length ($length)"
		exit
	fi
	length=`expr $length / 512`
	src/devzero -v $value -b 1 -n $length -o $offset $SCRATCH_DEV \
		| perl -npe 's/\d\.\d\dKb/X.XXKb/g'
}

_filter_repair()
{
	perl -ne '
# for sb
/- agno = / && next;	# remove each AG line (variable number)
s/(pointer to) (\d+)/\1 INO/;
s/(sb root inode value) (\d+)( \(NULLFSINO\))?/\1 INO/;
s/(realtime bitmap inode) (\d+)( \(NULLFSINO\))?/\1 INO/;
s/(realtime summary inode) (\d+)( \(NULLFSINO\))?/\1 INO/;
s/(inconsistent with calculated value) (\d+)/\1 INO/;
s/\.+(found)/\1/g;	# remove "searching" output
# for agf + agi
s/(bad length -{0,1}\d+ for ag. 0, should be) (\d+)/\1 LENGTH/;
s/(bad length # -{0,1}\d+ for ag. 0, should be) (\d+)/\1 LENGTH/;
s/(bad agbno) (\d+)/\1 AGBNO/g;
s/(max =) (\d+)/\1 MAX/g;
# for root inos
s/(on inode) (\d+)/\1 INO/g;
s/(imap claims a free inode) (\d+)/\1 INO/;
s/(imap claims in-use inode) (\d+)/\1 INO/;
s/(cleared root inode) (\d+)/\1 INO/;
s/(resetting inode) (\d+)/\1 INO/;
s/(disconnected dir inode) (\d+)/\1 INO/;
# for log
s/internal log/<TYPEOF> log/g;
s/external log on \S+/<TYPEOF> log/g;
# realtime subvol - remove this whole line if it appears
s/        - generate realtime summary info and bitmap...\n//g;
#
# new xfs repair output filters
#
s/\s+- creating \d+ worker thread\(s\)\n//g;
s/\s+- reporting progress in intervals of \d+ minutes\n//g;
s/\s+- \d+:\d\d:\d\d:.*\n//g;
	print;'
}

_filter_dd()
{
	fgrep -v records	# lose records in/out lines
}

# do some controlled corrupting & ensure repair recovers us
# 
_check_repair()
{
	value=$1
	structure="$2"

	#ensure the filesystem has been dirtied since last repair
	_scratch_mount
	POSIXLY_CORRECT=yes \
	dd if=/bin/sh of=$SCRATCH_MNT/sh 2>&1 |_filter_dd
	sync
	rm -f $SCRATCH_MNT/sh
	umount $SCRATCH_MNT

	_zero_position $value "$structure"
	_scratch_xfs_repair 2>&1 | _filter_repair

	# some basic sanity checks...
	_check_scratch_fs
	_scratch_mount                                      #mount
	POSIXLY_CORRECT=yes \
	dd if=/bin/sh of=$SCRATCH_MNT/sh 2>&1 |_filter_dd   #open,write
	POSIXLY_CORRECT=yes \
	dd if=$SCRATCH_MNT/sh of=/dev/null 2>&1 |_filter_dd #read
	rm -f $SCRATCH_MNT/sh                               #unlink
	umount $SCRATCH_MNT                                 #umount
}

# make sure this script returns success
/bin/true