xfs: introduce a common helper xfs_icluster_size_fsb

Introduce a common routine xfs_icluster_size_fsb() to calculate
and return the number of file system blocks per inode cluster.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/xfs/xfs_ialloc.h b/fs/xfs/xfs_ialloc.h
index d86f8bdc963e..812365d17e67 100644
--- a/fs/xfs/xfs_ialloc.h
+++ b/fs/xfs/xfs_ialloc.h
@@ -28,6 +28,16 @@ struct xfs_btree_cur;
 /* Move inodes in clusters of this size */
 #define XFS_INODE_BIG_CLUSTER_SIZE      8192
 
+/* Calculate and return the number of filesystem blocks per inode cluster */
+static inline int
+xfs_icluster_size_fsb(
+        struct xfs_mount        *mp)
+{
+        if (mp->m_sb.sb_blocksize >= mp->m_inode_cluster_size)
+                return 1;
+        return mp->m_inode_cluster_size >> mp->m_sb.sb_blocklog;
+}
+
 /*
  * Make an inode pointer out of the buffer/offset.
  */