vfs: Convert anon_inodes to use the new mount API

Convert the anon_inodes 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: linux-fsdevel@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/anon_inodes.c

@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/magic.h>
 #include <linux/anon_inodes.h>
+#include <linux/pseudo_fs.h>
 
 #include <linux/uaccess.h>
 
@@ -38,16 +39,18 @@ static const struct dentry_operations anon_inodefs_dentry_operations = {
 	.d_dname	= anon_inodefs_dname,
 };
 
-static struct dentry *anon_inodefs_mount(struct file_system_type *fs_type,
-				int flags, const char *dev_name, void *data)
+static int anon_inodefs_init_fs_context(struct fs_context *fc)
 {
-	return mount_pseudo(fs_type, NULL, &anon_inodefs_dentry_operations,
-			    ANON_INODE_FS_MAGIC);
+	struct pseudo_fs_context *ctx = init_pseudo(fc, ANON_INODE_FS_MAGIC);
+	if (!ctx)
+		return -ENOMEM;
+	ctx->dops = &anon_inodefs_dentry_operations;
+	return 0;
 }
 
 static struct file_system_type anon_inode_fs_type = {
 	.name		= "anon_inodefs",
-	.mount		= anon_inodefs_mount,
+	.init_fs_context = anon_inodefs_init_fs_context,
 	.kill_sb	= kill_anon_super,
 };