[PATCH v2 4/8] xfs: introduce a common helper xfs_icluster_size_fsb

[Jeff Liu]

From: Jie Liu <jeff.liu at oracle.com>

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 at oracle.com>
---
 fs/xfs/xfs_ialloc.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/xfs/xfs_ialloc.h b/fs/xfs/xfs_ialloc.h
index d86f8bd..812365d 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.
  */
-- 
1.8.3.2