1 files changed, 16 insertions, 0 deletions

diff --git a/fs/xfs/xfs_alloc_btree.c b/fs/xfs/xfs_alloc_btree.c
index 9e63f8c180d9..6ff27b75b93f 100644
--- a/fs/xfs/xfs_alloc_btree.c
+++ b/fs/xfs/xfs_alloc_btree.c
@@ -480,3 +480,19 @@ xfs_allocbt_init_cursor(
 
         return cur;
 }
+
+/*
+ * Calculate number of records in an alloc btree block.
+ */
+int
+xfs_allocbt_maxrecs(
+        struct xfs_mount        *mp,
+        int                     blocklen,
+        int                     leaf)
+{
+        blocklen -= sizeof(struct xfs_btree_sblock);
+
+        if (leaf)
+                return blocklen / sizeof(xfs_alloc_rec_t);
+        return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
+}