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xfs: introduce a common helper xfs_icluster_size_fsb

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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>
This commit is contained in:
Jie Liu 2013-12-13 15:51:48 +11:00 committed by Dave Chinner
parent 126cd105d4
commit 904957b750
1 changed files with 10 additions and 0 deletions
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10
fs/xfs/xfs_ialloc.h
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@ -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.
*/