[XFS] embededd struct xfs_imap into xfs_inode

Most uses of struct xfs_imap are to map and inode to a buffer.  To avoid
copying around the inode location information we should just embedd a
strcut xfs_imap into the xfs_inode.  To make sure it doesn't bloat an
inode the im_len is changed to a ushort, which is fine as that's what
the users exepect anyway.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 0a9ad1c56a87..d5c3aa1b18ef 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -83,6 +83,16 @@ typedef struct xfs_ifork {
 } xfs_ifork_t;
 
 /*
+ * Inode location information.  Stored in the inode and passed to
+ * xfs_imap_to_bp() to get a buffer and dinode for a given inode.
+ */
+struct xfs_imap {
+	xfs_daddr_t	im_blkno;	/* starting BB of inode chunk */
+	ushort		im_len;		/* length in BBs of inode chunk */
+	ushort		im_boffset;	/* inode offset in block in bytes */
+};
+
+/*
  * This is the xfs in-core inode structure.
  * Most of the on-disk inode is embedded in the i_d field.
  *
@@ -238,9 +248,7 @@ typedef struct xfs_inode {
 
 	/* Inode location stuff */
 	xfs_ino_t		i_ino;		/* inode number (agno/agino)*/
-	xfs_daddr_t		i_blkno;	/* blkno of inode buffer */
-	ushort			i_len;		/* len of inode buffer */
-	ushort			i_boffset;	/* off of inode in buffer */
+	struct xfs_imap		i_imap;		/* location for xfs_imap() */
 
 	/* Extent information. */
 	xfs_ifork_t		*i_afp;		/* attribute fork pointer */