[XFS] Cleanup various fid related bits:

- merge xfs_fid2 into it's only caller xfs_dm_inode_to_fh.
- remove xfs_vget and opencode it in the two callers, simplifying
both of them by avoiding the awkward calling convetion.
- assign directly to the dm_fid_t members in various places in the
dmapi code instead of casting them to xfs_fid_t first (which
is identical to dm_fid_t)

SGI-PV: 974747
SGI-Modid: xfs-linux-melb:xfs-kern:30258a

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Vlad Apostolov <[e-mail]>
Signed-off-by: Lachlan McIlroy <[e-mail]>

fs/xfs/linux-2.6/xfs_export.c

···
 	u64			ino,
 	u32			generation)
  {
-	xfs_fid_t		xfid;
-	bhv_vnode_t		*vp;
+ 	xfs_mount_t		*mp = XFS_M(sb);
+	xfs_inode_t		*ip;
 	int			error;
 
-	xfid.fid_len = sizeof(xfs_fid_t) - sizeof(xfid.fid_len);
-	xfid.fid_pad = 0;
-	xfid.fid_ino = ino;
-	xfid.fid_gen = generation;
+	/*
+	 * NFS can sometimes send requests for ino 0.  Fail them gracefully.
+	 */
+	if (ino == 0)
+		return ERR_PTR(-ESTALE);
 
-	error = xfs_vget(XFS_M(sb), &vp, &xfid);
+	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
 	if (error)
 		return ERR_PTR(-error);
+	if (!ip)
+		return ERR_PTR(-EIO);
 
-	return vp ? vn_to_inode(vp) : NULL;
+	if (!ip->i_d.di_mode || ip->i_d.di_gen != generation) {
+		xfs_iput_new(ip, XFS_ILOCK_SHARED);
+		return ERR_PTR(-ENOENT);
+	}
+
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	return ip->i_vnode;
 }
 
 STATIC struct dentry *

fs/xfs/xfs_vfsops.c

···
 
 	return XFS_ERROR(last_error);
 }
-
-/*
- * xfs_vget - called by DMAPI and NFSD to get vnode from file handle
- */
-int
-xfs_vget(
-	xfs_mount_t	*mp,
-	bhv_vnode_t	**vpp,
-	xfs_fid_t	*xfid)
-{
-	xfs_inode_t	*ip;
-	int		error;
-	xfs_ino_t	ino;
-	unsigned int	igen;
-
-	/*
-	 * Invalid.  Since handles can be created in user space and passed in
-	 * via gethandle(), this is not cause for a panic.
-	 */
-	if (xfid->fid_len != sizeof(*xfid) - sizeof(xfid->fid_len))
-		return XFS_ERROR(EINVAL);
-
-	ino  = xfid->fid_ino;
-	igen = xfid->fid_gen;
-
-	/*
-	 * NFS can sometimes send requests for ino 0.  Fail them gracefully.
-	 */
-	if (ino == 0)
-		return XFS_ERROR(ESTALE);
-
-	error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0);
-	if (error) {
-		*vpp = NULL;
-		return error;
-	}
-
-	if (ip == NULL) {
-		*vpp = NULL;
-		return XFS_ERROR(EIO);
-	}
-
-	if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) {
-		xfs_iput_new(ip, XFS_ILOCK_SHARED);
-		*vpp = NULL;
-		return XFS_ERROR(ENOENT);
-	}
-
-	*vpp = XFS_ITOV(ip);
-	xfs_iunlock(ip, XFS_ILOCK_SHARED);
-	return 0;
-}
-

fs/xfs/xfs_vfsops.h

···
 		struct xfs_mount_args *args);
 int xfs_root(struct xfs_mount *mp, bhv_vnode_t **vpp);
 int xfs_sync(struct xfs_mount *mp, int flags);
-int xfs_vget(struct xfs_mount *mp, bhv_vnode_t **vpp, struct xfs_fid *xfid);
 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 		int lnnum);
 void xfs_attr_quiesce(struct xfs_mount *mp);

fs/xfs/xfs_vnodeops.c

···
 	goto std_return;
 }
 
-
-int
-xfs_fid2(
-	xfs_inode_t	*ip,
-	xfs_fid_t	*xfid)
-{
-	xfs_itrace_entry(ip);
-
-	xfid->fid_len = sizeof(xfs_fid_t) - sizeof(xfid->fid_len);
-	xfid->fid_pad = 0;
-	/*
-	 * use memcpy because the inode is a long long and there's no
-	 * assurance that xfid->fid_ino is properly aligned.
-	 */
-	memcpy(&xfid->fid_ino, &ip->i_ino, sizeof(xfid->fid_ino));
-	xfid->fid_gen = ip->i_d.di_gen;
-
-	return 0;
-}
-
-
 int
 xfs_rwlock(
 	xfs_inode_t	*ip,

fs/xfs/xfs_vnodeops.h

···
 int xfs_symlink(struct xfs_inode *dp, bhv_vname_t *dentry,
 		char *target_path, mode_t mode, bhv_vnode_t **vpp,
 		struct cred *credp);
-int xfs_fid2(struct xfs_inode *ip, struct xfs_fid *xfid);
 int xfs_rwlock(struct xfs_inode *ip, bhv_vrwlock_t locktype);
 void xfs_rwunlock(struct xfs_inode *ip, bhv_vrwlock_t locktype);
 int xfs_inode_flush(struct xfs_inode *ip, int flags);