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[PATCH 1/5] xfs: introduce xfs_ialloc_blks_per_cluster

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: [PATCH 1/5] xfs: introduce xfs_ialloc_blks_per_cluster
From: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Wed, 11 Dec 2013 21:48:01 +0800
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0
From: Jie Liu <jeff.liu@xxxxxxxxxx>

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

Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
---
 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 a8f76a5..f4bfd32 100644
--- a/fs/xfs/xfs_ialloc.h
+++ b/fs/xfs/xfs_ialloc.h
@@ -37,6 +37,16 @@ struct xfs_btree_cur;
 #define        XFS_INODE_BIG_CLUSTER_SIZE      8192
 #define        XFS_INODE_CLUSTER_SIZE(mp)      (mp)->m_inode_cluster_size
 
+/* Calculate and return the number of blocks per inode cluster */
+static inline int
+xfs_ialloc_blks_per_cluster(
+       struct xfs_mount        *mp)
+{
+       if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp))
+               return 1;
+       return XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_blocklog;
+}
+
 /*
  * Make an inode pointer out of the buffer/offset.
  */
-- 
1.8.3.2

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