[XFS] implement generic xfs_btree_delete/delrec

Make the btree delete code generic. Based on a patch from David Chinner
with lots of changes to follow the original btree implementations more
closely. While this loses some of the generic helper routines for
inserting/moving/removing records it also solves some of the one off bugs
in the original code and makes it easier to verify.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32205a

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, 5 insertions, 0 deletions

diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index ff2552febba7..06ef792e0aac 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -192,6 +192,8 @@ struct xfs_btree_ops {
         /* update btree root pointer */
         void    (*set_root)(struct xfs_btree_cur *cur,
                                 union xfs_btree_ptr *nptr, int level_change);
+        int     (*kill_root)(struct xfs_btree_cur *cur, struct xfs_buf *bp,
+                                int level, union xfs_btree_ptr *newroot);
 
         /* block allocation / freeing */
         int     (*alloc_block)(struct xfs_btree_cur *cur,
@@ -207,6 +209,7 @@ struct xfs_btree_ops {
                                   int ptr, int reason);
 
         /* records in block/level */
+        int     (*get_minrecs)(struct xfs_btree_cur *cur, int level);
         int     (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
 
         /* records on disk.  Matter for the root in inode case. */
@@ -251,6 +254,7 @@ struct xfs_btree_ops {
  */
 #define LASTREC_UPDATE  0
 #define LASTREC_INSREC  1
+#define LASTREC_DELREC  2
 
 
 /*
@@ -562,6 +566,7 @@ int xfs_btree_new_root(struct xfs_btree_cur *, int *);
 int xfs_btree_new_iroot(struct xfs_btree_cur *, int *, int *);
 int xfs_btree_kill_iroot(struct xfs_btree_cur *);
 int xfs_btree_insert(struct xfs_btree_cur *, int *);
+int xfs_btree_delete(struct xfs_btree_cur *, int *);
 
 /*
  * Helpers.