apfstests/common.repair

##/bin/sh

#
# Functions useful for xfs_repair tests
# 
# Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
# 
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2 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.
# 
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
# 
# You should have received a copy of the GNU General Public License along
# with this program; if not, write the Free Software Foundation, Inc., 59
# Temple Place - Suite 330, Boston MA 02111-1307, USA.
# 
# Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
# Mountain View, CA  94043, or:
# 
# http://www.sgi.com 
# 
# For further information regarding this notice, see: 
# 
# http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
#

_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
}

_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+)/\1 INO/;
s/(realtime bitmap inode) (\d+)/\1 INO/;
s/(realtime summary inode) (\d+)/\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/(cleared root inode) (\d+)/\1 INO/;
s/(resetting inode) (\d+)/\1 INO/;
s/(disconnected dir inode) (\d+)/\1 INO/;
	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"
	_zero_position $value "$structure"
	xfs_repair $SCRATCH_DEV 2>&1 | _filter_repair
	# some basic sanity checks...
	_check_fs $SCRATCH_DEV
	mount -t xfs $SCRATCH_DEV $SCRATCH_MNT              #mount
	dd if=/bin/sh of=$SCRATCH_MNT/sh 2>&1 |_filter_dd   #open,write
	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