apfstests/030

#! /bin/sh
# XFS QA Test No. 030
#
# exercise xfs_repair repairing broken filesystems
#
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# creator
owner=nathans@sgi.com

seq=`basename $0`
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!

_cleanup()
{
	umount $SCRATCH_DEV 2>/dev/null
	rm -f $tmp.*
}

trap "_cleanup; exit \$status" 0 1 2 3 15

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

# nuke the superblock, AGI, AGF, AGFL; then try repair the damage
# 
_check_ag()
{
	for structure in 'sb 0' 'agf 0' 'agi 0' 'agfl 0'
	do
		echo "Corrupting $structure - setting bits to $1"
		_check_repair $1 "$structure"
	done
}

# real QA test starts here
_require_nobigloopfs
_require_scratch

DSIZE="-dsize=100m"

# first we need to ensure there are no bogus secondary
# superblocks between the primary and first secondary
# superblock (hanging around from earlier tests)...
# 

_scratch_mkfs_xfs $DSIZE >/dev/null 2>&1
if [ $? -ne 0 ]		# probably don't have a big enough scratch
then
	_notrun "SCRATCH_DEV too small, results would be non-deterministic"
else
	_scratch_mount
	src/feature -U $SCRATCH_DEV && \
		_notrun "Quota are enabled, test needs controlled sb recovery"
	src/feature -G $SCRATCH_DEV && \
		_notrun "Quota are enabled, test needs controlled sb recovery"
	umount $SCRATCH_DEV
fi
clear=""
eval `xfs_db -r -c "sb 1" -c stack $SCRATCH_DEV | perl -ne '
	if (/byte offset (\d+), length (\d+)/) {
		print "clear=", $1 / 512, "\n"; exit
	}'`
[ -z "$clear" ] && echo "Cannot calculate length to clear"
src/devzero -v -1 -n "$clear" $SCRATCH_DEV >/dev/null

# now kick off the real repair test...
# 
_scratch_mkfs_xfs $DSIZE | _filter_mkfs 2>$tmp.mkfs
source $tmp.mkfs
_check_ag 0
_check_ag -1


# success, all done
status=0
exit