xfs: create simplified inode walk function

Create a new iterator function to simplify walking inodes in an XFS
filesystem.  This new iterator will replace the existing open-coded
walking that goes on in various places.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/xfs_itable.c

@@ -18,6 +18,7 @@
 #include "xfs_error.h"
 #include "xfs_icache.h"
 #include "xfs_health.h"
+#include "xfs_iwalk.h"
 
 /*
  * Return stat information for one inode.
@@ -160,7 +161,7 @@ xfs_bulkstat_one(
  * Loop over all clusters in a chunk for a given incore inode allocation btree
  * record.  Do a readahead if there are any allocated inodes in that cluster.
  */
-STATIC void
+void
 xfs_bulkstat_ichunk_ra(
 	struct xfs_mount		*mp,
 	xfs_agnumber_t			agno,
@@ -194,7 +195,7 @@ xfs_bulkstat_ichunk_ra(
  * are some left allocated, update the data for the pointed-to record as well as
  * return the count of grabbed inodes.
  */
-STATIC int
+int
 xfs_bulkstat_grab_ichunk(
 	struct xfs_btree_cur		*cur,	/* btree cursor */
 	xfs_agino_t			agino,	/* starting inode of chunk */