[PATCH] (1/8) ->get_sb() switchover

	OK, here comes the long-promised switchover to ->get_sb().

New method added - ->get_sb(type, flags, dev, data).  At this point we
still keep ->read_super(), but it will go away in the end of series. 
->get_sb() is a generalization of get_sb_{bdev,nodev,single}() - as the
matter of fact, these will become common helpers used by filesystems in
their ->get_sb(). 

fs/super.c

@@ -792,7 +792,9 @@ do_kern_mount(const char *fstype, int flags, char *name, void *data)
 	mnt = alloc_vfsmnt(name);
 	if (!mnt)
 		goto out;
-	if (type->fs_flags & FS_REQUIRES_DEV)
+	if (type->get_sb)
+		sb = type->get_sb(type, flags, name, data);
+	else if (type->fs_flags & FS_REQUIRES_DEV)
 		sb = get_sb_bdev(type, flags, name, data);
 	else if (type->fs_flags & FS_SINGLE)
 		sb = get_sb_single(type, flags, name, data);

include/linux/fs.h

@@ -926,9 +926,20 @@ struct dquot_operations {
 	int (*transfer) (struct inode *, struct iattr *);
 };
 
+/*
+ *		NOTE NOTE NOTE
+ *
+ *	->read_super() is going to die.  New method (->get_sb) should replace
+ * it.  The only reason why ->read_super() is left for _SHORT_ transition
+ * period is to avoid a single patch touching every fs.  They will be
+ * converted one-by-one and ONCE THAT IS DONE OR TWO WEEKS HAD PASSED
+ * (whatever sooner) ->read_super() WILL DISAPPEAR.  
+ */
+
 struct file_system_type {
 	const char *name;
 	int fs_flags;
+	struct super_block *(*get_sb) (struct file_system_type *, int, char *, void *);
 	struct super_block *(*read_super) (struct super_block *, void *, int);
 	struct module *owner;
 	struct file_system_type * next;