[XFS] cleanup fid types mess

Currently XFs has three different fid types: struct fid, struct xfs_fid
and struct xfs_fid2 with hte latter two beeing identicaly and the first
one beeing the same size but an unstructured array with the same size.

This patch consolidates all this to alway uuse struct xfs_fid.

This patch is required for an upcoming patch series from me that revamps
the nfs exporting code and introduces a Linux-wide struct fid.

SGI-PV: 970336
SGI-Modid: xfs-linux-melb:xfs-kern:29651a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c
index a5a8454..a154459 100644
--- a/fs/xfs/xfs_vfsops.c
+++ b/fs/xfs/xfs_vfsops.c
@@ -1635,9 +1635,8 @@
 xfs_vget(
 	xfs_mount_t	*mp,
 	bhv_vnode_t	**vpp,
-	fid_t		*fidp)
+	xfs_fid_t	*xfid)
 {
-	xfs_fid_t	*xfid = (struct xfs_fid *)fidp;
 	xfs_inode_t	*ip;
 	int		error;
 	xfs_ino_t	ino;
@@ -1647,11 +1646,11 @@
 	 * Invalid.  Since handles can be created in user space and passed in
 	 * via gethandle(), this is not cause for a panic.
 	 */
-	if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len))
+	if (xfid->fid_len != sizeof(*xfid) - sizeof(xfid->fid_len))
 		return XFS_ERROR(EINVAL);
 
-	ino  = xfid->xfs_fid_ino;
-	igen = xfid->xfs_fid_gen;
+	ino  = xfid->fid_ino;
+	igen = xfid->fid_gen;
 
 	/*
 	 * NFS can sometimes send requests for ino 0.  Fail them gracefully.