[XFS] implement generic xfs_btree_lookup

From: Dave Chinner <dgc@sgi.com>

[hch: split out from bigger patch and minor adaptions]

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32192a

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>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 52b2da6ab32e..c151175a5fd0 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -190,6 +190,16 @@ struct xfs_btree_ops {
         /* records in block/level */
         int     (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
 
+        /* init values of btree structures */
+        void    (*init_key_from_rec)(union xfs_btree_key *key,
+                                     union xfs_btree_rec *rec);
+        void    (*init_ptr_from_cur)(struct xfs_btree_cur *cur,
+                                     union xfs_btree_ptr *ptr);
+
+        /* difference between key value and cursor value */
+        __int64_t (*key_diff)(struct xfs_btree_cur *cur,
+                              union xfs_btree_key *key);
+
         /* btree tracing */
 #ifdef XFS_BTREE_TRACE
         void            (*trace_enter)(struct xfs_btree_cur *, const char *,
@@ -507,6 +517,7 @@ xfs_btree_setbuf(
  */
 int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
 int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
+int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
 
 /*
  * Helpers.