[XFS] Cleanup maxrecs calculation.

Clean up the way the maximum and minimum records for the btree blocks are
calculated. For the alloc and inobt btrees all the values are
pre-calculated in xfs_mount_common, and we switch the current loop around
the ugly generic macros that use cpp token pasting to generate type names
to two small helpers in normal C code. For the bmbt and bmdr trees these
helpers also exist, but can be called during runtime, too. Here we also
kill various macros dealing with them and inline the logic into the
get_minrecs / get_maxrecs / get_dmaxrecs methods in xfs_bmap_btree.c.

Note that all these new helpers take an xfs_mount * argument which will be
needed to determine the size of a btree block once we add support for
extended btree blocks with CRCs and other RAS information.

SGI-PV: 988146

SGI-Modid: xfs-linux-melb:xfs-kern:32292a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 0 insertions, 13 deletions

diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 7425b2b4a254..795a124cee6f 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -148,19 +148,6 @@ do {    \
         case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break;       \
         }       \
 } while (0)
-/*
- * Maximum and minimum records in a btree block.
- * Given block size, type prefix, and leaf flag (0 or 1).
- * The divisor below is equivalent to lf ? (e1) : (e2) but that produces
- * compiler warnings.
- */
-#define XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf)       \
-        ((int)(((bsz) - (uint)sizeof(t ## _block_t)) / \
-         (((lf) * (uint)sizeof(t ## _rec_t)) + \
-          ((1 - (lf)) * \
-           ((uint)sizeof(t ## _key_t) + (uint)sizeof(t ## _ptr_t))))))
-#define XFS_BTREE_BLOCK_MINRECS(bsz,t,lf)       \
-        (XFS_BTREE_BLOCK_MAXRECS(bsz,t,lf) / 2)
 
 /*
  * Record, key, and pointer address calculation macros.