[XFS] Clean up some existing compat ioctl calls

Create a new xfs_ioctl.h file which has prototypes for
ioctl helpers that may be called in compat mode.

Change several compat ioctl cases which are IOW to simply copy
in the userspace argument, then call the common ioctl helper.

This also fixes xfs_compat_ioc_fsgeometry_v1(), which had
it backwards before; it copied in an (empty) arg, then copied
out the native result, which probably corrupted userspace.  It
should be translating on the copyout.

Also, a bit of formatting cleanup for consistency, and conversion
of all error returns to use XFS_ERROR().

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

fs/xfs/linux-2.6/xfs_ioctl.c

@@ -68,7 +68,7 @@
  * XFS_IOC_PATH_TO_HANDLE
  *    returns full handle for a path
  */
-STATIC int
+int
 xfs_find_handle(
 	unsigned int		cmd,
 	xfs_fsop_handlereq_t	*hreq)
@@ -245,7 +245,7 @@ xfs_vget_fsop_handlereq(
 	return 0;
 }
 
-STATIC int
+int
 xfs_open_by_handle(
 	xfs_mount_t		*mp,
 	xfs_fsop_handlereq_t	*hreq,
@@ -355,7 +355,7 @@ do_readlink(
 }
 
 
-STATIC int
+int
 xfs_readlink_by_handle(
 	xfs_mount_t		*mp,
 	xfs_fsop_handlereq_t	*hreq,
@@ -651,7 +651,7 @@ xfs_attrmulti_by_handle(
 	return -error;
 }
 
-STATIC int
+int
 xfs_ioc_space(
 	struct xfs_inode	*ip,
 	struct inode		*inode,

fs/xfs/linux-2.6/xfs_ioctl.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2008 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef __XFS_IOCTL_H__
+#define __XFS_IOCTL_H__
+
+extern int
+xfs_ioc_space(
+	struct xfs_inode	*ip,
+	struct inode		*inode,
+	struct file		*filp,
+	int			ioflags,
+	unsigned int		cmd,
+	xfs_flock64_t		*bf);
+
+extern int
+xfs_find_handle(
+	unsigned int		cmd,
+	xfs_fsop_handlereq_t	*hreq);
+
+extern int
+xfs_open_by_handle(
+	xfs_mount_t		*mp,
+	xfs_fsop_handlereq_t	*hreq,
+	struct file		*parfilp,
+	struct inode		*parinode);
+
+extern int
+xfs_readlink_by_handle(
+	xfs_mount_t		*mp,
+	xfs_fsop_handlereq_t	*hreq,
+	struct inode		*parinode);
+#endif