xfstests generic/260: get correct trimmed bytes

Starting from util-linux v2.23 fstrim(1) reports trimmed bytes
differently, e.g.

new fstrim: /mnt/ext4: 9.7 GiB (10411118592 bytes) trimmed
old fstrim: /mnt/ext4: 10411118592 bytes were trimmed

generic/260 reports syntax error

    +./tests/generic/260: line 111: [: 9.7: integer expression expected
    +./tests/generic/260: line 121: [: 9.7: integer expression expected
    +./tests/generic/260: line 183: [: 9.7: integer expression expected

Add a new filter called _filter_fstrim in common/filter and get the
correct trimmed bytes in generic/260, so the test passes with both old
and new fstrim.

Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>

common/filter

@@ -288,5 +288,13 @@ _filter_size_to_bytes()
 	echo $((${size:0:${#size}-1}*$mul))
 }
 
+# Print trimmed bytes of fstrim
+# Starting from util-linux v2.23 fstrim usees human readable sizes in
+# verbose output
+_filter_fstrim()
+{
+	egrep -o "[0-9]+ bytes" | $AWK_PROG '{print $1}'
+}
+
 # make sure this script returns success
 /bin/true

tests/generic/260

@@ -104,9 +104,7 @@ _scratch_mount
 # This is a bit fuzzy, but since the file system is fresh
 # there should be at least (fssize/2) free space to trim.
 # This is supposed to catch wrong FITRIM argument handling
-out=$($FSTRIM_PROG -v -o10M $SCRATCH_MNT)
-nopref=${out##*: }
-bytes=${nopref%% *}
+bytes=$($FSTRIM_PROG -v -o10M $SCRATCH_MNT | _filter_fstrim)
 
 if [ $bytes -gt $(_math "$fssize*1024") ]; then
 	status=1
@@ -177,9 +175,7 @@ _scratch_mount
 # It is because btrfs does not have not-yet-used parts of the device
 # mapped and since we got here right after the mkfs, there is not
 # enough free extents in the root tree.
-out=$($FSTRIM_PROG -v -l$len $SCRATCH_MNT)
-nopref=${out##*: }
-bytes=${nopref%% *}
+bytes=$($FSTRIM_PROG -v -l$len $SCRATCH_MNT | _filter_fstrim)
 if [ $bytes -le $(_math "$fssize*512") ] && [ $FSTYP != "btrfs" ]; then
 	status=1
 	echo "It seems that fs logic handling len argument overflows"