add get_maxrecs btree operation

Index: linux-2.6-xfs/fs/xfs/xfs_btree.c
===================================================================
@@ -52,31 +52,6 @@ const __uint32_t xfs_magics[XFS_BTNUM_MA
 };
 
 /*
- * Checking routine: return maxrecs for the block.
- */
-STATIC int				/* number of records fitting in block */
-xfs_btree_maxrecs(
-	xfs_btree_cur_t		*cur,	/* btree cursor */
-	xfs_btree_block_t	*block)	/* generic btree block pointer */
-{
-	switch (cur->bc_btnum) {
-	case XFS_BTNUM_BNO:
-	case XFS_BTNUM_CNT:
-		return (int)XFS_ALLOC_BLOCK_MAXRECS(
-				be16_to_cpu(block->bb_level), cur);
-	case XFS_BTNUM_BMAP:
-		return (int)XFS_BMAP_BLOCK_IMAXRECS(
-				be16_to_cpu(block->bb_level), cur);
-	case XFS_BTNUM_INO:
-		return (int)XFS_INOBT_BLOCK_MAXRECS(
-				be16_to_cpu(block->bb_level), cur);
-	default:
-		ASSERT(0);
-		return 0;
-	}
-}
-
-/*
  * External routines.
  */
 

@@ -208,7 +183,7 @@ xfs_btree_check_lblock(
 		be32_to_cpu(block->bb_magic) == xfs_magics[cur->bc_btnum] &&
 		be16_to_cpu(block->bb_level) == level &&
 		be16_to_cpu(block->bb_numrecs) <=
-			xfs_btree_maxrecs(cur, (xfs_btree_block_t *)block) &&
+			cur->bc_ops->get_maxrecs(cur, level) &&
 		block->bb_leftsib &&
 		(be64_to_cpu(block->bb_leftsib) == NULLDFSBNO ||
 		 XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_leftsib))) &&

@@ -245,7 +220,7 @@ xfs_btree_check_sblock(
 		be32_to_cpu(block->bb_magic) == xfs_magics[cur->bc_btnum] &&
 		be16_to_cpu(block->bb_level) == level &&
 		be16_to_cpu(block->bb_numrecs) <=
-			xfs_btree_maxrecs(cur, (xfs_btree_block_t *)block) &&
+			cur->bc_ops->get_maxrecs(cur, level) &&
 		(be32_to_cpu(block->bb_leftsib) == NULLAGBLOCK ||
 		 be32_to_cpu(block->bb_leftsib) < agflen) &&
 		block->bb_leftsib &&

Index: linux-2.6-xfs/fs/xfs/xfs_btree.h
===================================================================
@@ -200,6 +200,9 @@ struct xfs_btree_ops {
 	union xfs_btree_rec *(*rec_addr)(struct xfs_btree_cur *cur, int index,
 					 struct xfs_btree_block *block);
 
+	/* records in block/level */
+	int	(*get_maxrecs)(struct xfs_btree_cur *cur, int level);
+
 	/* init values of btree structures */
 	void	(*init_key_from_rec)(struct xfs_btree_cur *cur,
 				     union xfs_btree_key *key,

Index: linux-2.6-xfs/fs/xfs/xfs_alloc_btree.c
===================================================================
@@ -1655,6 +1655,14 @@ xfs_allocbt_update_lastrec(
 	xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
 }
 
+STATIC int
+xfs_allocbt_get_maxrecs(
+	struct xfs_btree_cur	*cur,
+	int			level)
+{
+	return cur->bc_mp->m_alloc_mxr[level != 0];
+}
+
 STATIC void
 xfs_allocbt_init_key_from_rec(
 	struct xfs_btree_cur	*cur,

@@ -1895,6 +1903,7 @@ xfs_allocbt_trace_record(
 static const struct xfs_btree_ops xfs_allocbt_ops = {
 	.dup_cursor		= xfs_allocbt_dup_cursor,
 	.update_lastrec		= xfs_allocbt_update_lastrec,
+	.get_maxrecs		= xfs_allocbt_get_maxrecs,
 	.init_key_from_rec	= xfs_allocbt_init_key_from_rec,
 	.init_ptr_from_cur	= xfs_allocbt_init_ptr_from_cur,
 	.ptr_addr		= xfs_allocbt_ptr_addr,

Index: linux-2.6-xfs/fs/xfs/xfs_bmap_btree.c
===================================================================
@@ -1955,6 +1955,14 @@ xfs_bmbt_get_root_from_inode(
 	return (struct xfs_btree_block *)ifp->if_broot;
 }
 
+STATIC int
+xfs_bmbt_get_maxrecs(
+	struct xfs_btree_cur	*cur,
+	int			level)
+{
+	return XFS_BMAP_BLOCK_IMAXRECS(level, cur);
+}
+
 STATIC void
 xfs_bmbt_init_key_from_rec(
 	struct xfs_btree_cur	*cur,

@@ -2179,6 +2187,7 @@ static const struct xfs_btree_ops xfs_bm
 	.get_root_from_inode	= xfs_bmbt_get_root_from_inode,
 	.init_key_from_rec	= xfs_bmbt_init_key_from_rec,
 	.init_ptr_from_cur	= xfs_bmbt_init_ptr_from_cur,
+	.get_maxrecs		= xfs_bmbt_get_maxrecs,
 	.ptr_addr		= xfs_bmbt_ptr_addr,
 	.key_addr		= xfs_bmbt_key_addr,
 	.rec_addr		= xfs_bmbt_rec_addr,

Index: linux-2.6-xfs/fs/xfs/xfs_ialloc_btree.c
===================================================================
@@ -1516,6 +1516,14 @@ xfs_inobt_dup_cursor(
 			cur->bc_private.a.agbp, cur->bc_private.a.agno);
 }
 
+STATIC int
+xfs_inobt_get_maxrecs(
+	struct xfs_btree_cur	*cur,
+	int			level)
+{
+	return cur->bc_mp->m_inobt_mxr[level != 0];
+}
+
 STATIC void
 xfs_inobt_init_key_from_rec(
 	struct xfs_btree_cur	*cur,

@@ -1720,6 +1728,7 @@ xfs_inobt_trace_record(
 
 static const struct xfs_btree_ops xfs_inobt_ops = {
 	.dup_cursor		= xfs_inobt_dup_cursor,
+	.get_maxrecs		= xfs_inobt_get_maxrecs,
 	.init_key_from_rec	= xfs_inobt_init_key_from_rec,
 	.init_ptr_from_cur	= xfs_inobt_init_ptr_from_cur,
 	.ptr_addr		= xfs_inobt_ptr_addr,