vfs: Convert sockfs to use the new mount API

Convert the sockfs filesystem to the new internal mount API as the old
one will be obsoleted and removed.  This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.

See Documentation/filesystems/mount_api.txt for more information.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: netdev@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

net/socket.c

@@ -79,6 +79,7 @@
 #include <linux/module.h>
 #include <linux/highmem.h>
 #include <linux/mount.h>
+#include <linux/pseudo_fs.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/compat.h>
@@ -359,19 +360,22 @@ static const struct xattr_handler *sockfs_xattr_handlers[] = {
 	NULL
 };
 
-static struct dentry *sockfs_mount(struct file_system_type *fs_type,
-			 int flags, const char *dev_name, void *data)
+static int sockfs_init_fs_context(struct fs_context *fc)
 {
-	return mount_pseudo_xattr(fs_type, &sockfs_ops,
-				  sockfs_xattr_handlers,
-				  &sockfs_dentry_operations, SOCKFS_MAGIC);
+	struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC);
+	if (!ctx)
+		return -ENOMEM;
+	ctx->ops = &sockfs_ops;
+	ctx->dops = &sockfs_dentry_operations;
+	ctx->xattr = sockfs_xattr_handlers;
+	return 0;
 }
 
 static struct vfsmount *sock_mnt __read_mostly;
 
 static struct file_system_type sock_fs_type = {
 	.name =		"sockfs",
-	.mount =	sockfs_mount,
+	.init_fs_context = sockfs_init_fs_context,
 	.kill_sb =	kill_anon_super,
 };