[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>

1 files changed, 9 insertions, 0 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,