[XFS] implement semi-generic xfs_btree_new_root
From: Dave Chinner <dgc@sgi.com>
Add a xfs_btree_new_root helper for the alloc and ialloc btrees. The bmap
btree needs it's own version and is not converted.
[hch: split out from bigger patch and minor adaptions]
SGI-PV: 985583
SGI-Modid: xfs-linux-melb:xfs-kern:32200a
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 354a665..1801539 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -187,6 +187,10 @@
/* cursor operations */
struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
+ /* update btree root pointer */
+ void (*set_root)(struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *nptr, int level_change);
+
/* block allocation / freeing */
int (*alloc_block)(struct xfs_btree_cur *cur,
union xfs_btree_ptr *start_bno,
@@ -543,6 +547,7 @@
int xfs_btree_rshift(struct xfs_btree_cur *, int, int *);
int xfs_btree_split(struct xfs_btree_cur *, int, union xfs_btree_ptr *,
union xfs_btree_key *, struct xfs_btree_cur **, int *);
+int xfs_btree_new_root(struct xfs_btree_cur *, int *);
/*
* Helpers.