[XFS] Remove vn_from_inode()

bhv_vnode_t is just a typedef for struct inode, so there's
no need for a helper to convert between the two.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31760a
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

fs/xfs/linux-2.6/xfs_super.c

@@ -994,7 +994,7 @@ STATIC void
 xfs_fs_destroy_inode(
 	struct inode		*inode)
 {
-	kmem_zone_free(xfs_vnode_zone, vn_from_inode(inode));
+	kmem_zone_free(xfs_vnode_zone, inode);
 }
 
 STATIC void

fs/xfs/linux-2.6/xfs_vnode.h

@@ -27,10 +27,6 @@ typedef struct inode	bhv_vnode_t;
 /*
  * Vnode to Linux inode mapping.
  */
-static inline bhv_vnode_t *vn_from_inode(struct inode *inode)
-{
-	return inode;
-}
 static inline struct inode *vn_to_inode(bhv_vnode_t *vnode)
 {
 	return vnode;
@@ -100,8 +96,7 @@ extern bhv_vnode_t	*vn_hold(bhv_vnode_t *);
 
 static inline bhv_vnode_t *vn_grab(bhv_vnode_t *vp)
 {
-	struct inode *inode = igrab(vn_to_inode(vp));
-	return inode ? vn_from_inode(inode) : NULL;
+	return igrab(vn_to_inode(vp));
 }
 
 /*