xfsqa: define resblks for tests near ENOSPC

Several tests assume a certain amount of disk space free after the
reserve block pool is filled. Changing the default size of the
reserve block pool breaks these tests because there is less space
available that first thought.

Change these tests to specify a known reserve block pool size of
1024 blocks to ensure that they continue to work correctly even if
the default size changes.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

104

@@ -48,6 +48,10 @@ _create_scratch()
 		echo "failed to mount $SCRATCH_DEV"
 		exit 1
 	fi
+
+	# fix the reserve block pool to a known size so that the enospc
+	# calculations work out correctly.
+	_scratch_resvblks 1024 >  /dev/null 2>&1
 }
 
 _fill_scratch()

204

@@ -44,6 +44,10 @@ SIZE=`expr 104 \* 1024 \* 1024`
 _scratch_mkfs_sized $SIZE  &> /dev/null
 _scratch_mount
 
+# fix the reserve block pool to a known size so that the enospc calculations
+# work out correctly.
+_scratch_resvblks 1024 > $seq.full 2>&1
+
 for i in `seq 1 22500`; do
     echo -n > $SCRATCH_MNT/$i
     echo XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX > $SCRATCH_MNT/$i

205

@@ -43,6 +43,10 @@ _require_scratch
 _scratch_mkfs_xfs -d size=16m -b size=512 >/dev/null
 _scratch_mount
 
+# fix the reserve block pool to a known size so that the enospc calculations
+# work out correctly.
+_scratch_resvblks 1024 > $seq.full 2>&1
+
 # on a 16MB filesystem, there's 32768x512byte blocks. used is:
 #	- 4944 in the log,
 #	- 32+1 for the root inode cluster

common.rc

@@ -361,6 +361,17 @@ _scratch_mkfs_geom()
     _scratch_mkfs
 }
 
+_scratch_resvblks()
+{
+	case $FSTYP in
+	xfs)
+		xfs_io -x -c "resblks $1" $SCRATCH_MNT
+		;;
+	*)
+		;;
+	esac
+}
+
 _scratch_xfs_db_options()
 {
     SCRATCH_OPTIONS=""