[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 */