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defrag: add options to _defrag helper

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Sometimes it is not easy to know number of expected extents in advance.
In that case it is reasonable to provide sane MIN and MAX values.
Also helper will check that number of extents before defragmentaion
is not greather than after.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dmitry Monakhov
2014-08-13 11:16:49 +10:00
committed by Dave Chinner
parent 6bcae5cbe4
commit 2f87a77e0f
2 changed files with 99 additions and 14 deletions
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common/defrag
+93 -8
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@@ -43,29 +43,114 @@ _require_defrag()
_extent_count()
{
$XFS_IO_PROG -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l
$XFS_IO_PROG -c "fiemap" $1 >> $seqres.full 2>&1
$XFS_IO_PROG -c "fiemap" $1 | tail -n +2 | grep -v hole | wc -l| $AWK_PROG '{print $1}'
}
_check_extent_count()
{
min=$1
max=$2
ext_cnt=$3
[ "$min" -gt "$ext_cnt" ] && _fail "Found $ext_cnt extents min:$max"
[ "$max" -ne -1 ] && [ "$ext_cnt" -gt "$max" ] && _fail "Found $ext_cnt max: $max"
if [ $max -ne $min ]; then
echo "in_range($min, $max)"
else
echo "$ext_cnt"
fi
return $ext_cnt
}
# Defrag file, check it, and remove it.
_defrag()
{
min_before=0
max_before=-1
min_after=0
max_after=-1
csum=1
mtime=1
while [ $# -gt 1 ]
do
case $1
in
--min_before)
[ -z "$2" ] && _fail "missing argument for --min_before"
min_before=$2
shift
;;
--max_before)
[ -z "$2" ] && _fail "missing argument for --max_before"
max_before=$2
shift
;;
--min_after)
[ -z "$2" ] && _fail "missing argument for --min_after"
min_after=$2
shift
;;
--max_after)
[ -z "$2" ] && _fail "missing argument for --max_after"
max_after=$2
shift
;;
--before)
[ -z "$2" ] && _fail "missing argument for --before"
min_before=$2
max_before=$2
shift
;;
--after)
[ -z "$2" ] && _fail "missing argument for --after"
min_after=$2
max_after=$2
shift
;;
--no_csum)
csum=
;;
--no_mtime)
mtime=
;;
--no_unlink)
no_unlink=1
;;
*)
_fail "invalid argument to common/dump function: $1"
;;
esac
shift
done
echo -n "Before: "
_extent_count $1
CSUM_BEFORE=`md5sum $1`
ext_before=$(_extent_count $1)
_check_extent_count $min_before $max_before $ext_before
[ ! -z $csum ] && CSUM_BEFORE=`md5sum $1`
STAT_BEFORE=`stat -c "a: %x m: %y c: %z" $1`
$DEFRAG_PROG -v $1 >> $seqres.full 2>&1
_scratch_remount
STAT_AFTER=`stat -c "a: %x m: %y c: %z" $1`
CSUM_AFTER=`md5sum $1`
[ ! -z $csum ] && CSUM_AFTER=`md5sum $1`
echo -n "After: "
_extent_count $1
if [ "$CSUM_BEFORE" != "$CSUM_AFTER" ]; then
ext_after=$(_extent_count $1)
_check_extent_count $min_after $max_after $ext_after
[ "$ext_before" -lt "$ext_after" ] && \
_fail "Number of extents increased after defragmentation," \
" before:$ext_before, after:$ext_after"
if [ ! -z $csum ] && [ "$CSUM_BEFORE" != "$CSUM_AFTER" ]; then
_fail "file checksum changed post-defrag ($CSUM_BEFORE/$CSUM_AFTER)"
fi
if [ "$STAT_BEFORE" != "$STAT_AFTER" ]; then
if [ ! -z $mtime ] && [ "$STAT_BEFORE" != "$STAT_AFTER" ]; then
_fail "file timestamps changed post-defrag:\n$STAT_BEFORE\n$STAT_AFTER"
fi
rm -f $1
[ -z $no_unlink ] && rm -f $1
}