[XFS] add get_maxrecs btree operation

Factor xfs_btree_maxrecs into a per-btree operation.

The get_maxrecs method is based on a patch from Dave Chinner.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32188a

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>

5 files changed, 32 insertions, 27 deletions

diff --git a/fs/xfs/xfs_alloc_btree.c b/fs/xfs/xfs_alloc_btree.c
index 9c91dfcb6f29..1f268b6f4362 100644
--- a/fs/xfs/xfs_alloc_btree.c
+++ b/fs/xfs/xfs_alloc_btree.c
@@ -2219,6 +2219,14 @@ xfs_allocbt_dup_cursor(
                         cur->bc_btnum);
 }
 
+STATIC int
+xfs_allocbt_get_maxrecs(
+        struct xfs_btree_cur    *cur,
+        int                     level)
+{
+        return cur->bc_mp->m_alloc_mxr[level != 0];
+}
+
 #ifdef XFS_BTREE_TRACE
 ktrace_t        *xfs_allocbt_trace_buf;
 
@@ -2287,6 +2295,7 @@ xfs_allocbt_trace_record(
 
 static const struct xfs_btree_ops xfs_allocbt_ops = {
         .dup_cursor             = xfs_allocbt_dup_cursor,
+        .get_maxrecs            = xfs_allocbt_get_maxrecs,
 
 #ifdef XFS_BTREE_TRACE
         .trace_enter            = xfs_allocbt_trace_enter,
diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c
index 16f2fde6433d..bdcfbea1e062 100644
--- a/fs/xfs/xfs_bmap_btree.c
+++ b/fs/xfs/xfs_bmap_btree.c
@@ -2415,6 +2415,14 @@ xfs_bmbt_dup_cursor(
         return new;
 }
 
+STATIC int
+xfs_bmbt_get_maxrecs(
+        struct xfs_btree_cur    *cur,
+        int                     level)
+{
+        return XFS_BMAP_BLOCK_IMAXRECS(level, cur);
+}
+
 #ifdef XFS_BTREE_TRACE
 ktrace_t        *xfs_bmbt_trace_buf;
 
@@ -2502,6 +2510,7 @@ xfs_bmbt_trace_record(
 
 static const struct xfs_btree_ops xfs_bmbt_ops = {
         .dup_cursor             = xfs_bmbt_dup_cursor,
+        .get_maxrecs            = xfs_bmbt_get_maxrecs,
 
 #ifdef XFS_BTREE_TRACE
         .trace_enter            = xfs_bmbt_trace_enter,
diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index 966d58d50fad..893e86f2ad57 100644
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -51,31 +51,6 @@ const __uint32_t xfs_magics[XFS_BTNUM_MAX] = {
 };
 
 /*
- * 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.
  */
 
@@ -207,7 +182,7 @@ 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 &&
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 0647a0eff0de..5398cd0d4d4d 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -183,6 +183,9 @@ struct xfs_btree_ops {
         /* cursor operations */
         struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
 
+        /* records in block/level */
+        int     (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
+
         /* btree tracing */
 #ifdef XFS_BTREE_TRACE
         void            (*trace_enter)(struct xfs_btree_cur *, const char *,
diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index fc99524b17af..18867f1aacac 100644
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -2085,6 +2085,14 @@ 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];
+}
+
 #ifdef XFS_BTREE_TRACE
 ktrace_t        *xfs_inobt_trace_buf;
 
@@ -2153,6 +2161,7 @@ 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,
 
 #ifdef XFS_BTREE_TRACE
         .trace_enter            = xfs_inobt_trace_enter,