cleancache: zap uuid arg of cleancache_init_shared_fs

Use super_block->s_uuid instead. Every shared filesystem using cleancache
must now initialize super_block->s_uuid before calling
cleancache_init_shared_fs. The only one on the tree, ocfs2, already meets
this requirement.

Signed-off-by: Vladimir Davydov <[e-mail]>
Cc: Konrad Rzeszutek Wilk <[e-mail]>
Cc: Boris Ostrovsky <[e-mail]>
Cc: David Vrabel <[e-mail]>
Cc: Mark Fasheh <[e-mail]>
Cc: Joel Becker <[e-mail]>
Cc: Stefan Hengelein <[e-mail]>
Cc: Florian Schmaus <[e-mail]>
Cc: Andor Daam <[e-mail]>
Cc: Dan Magenheimer <[e-mail]>
Cc: Bob Liu <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/ocfs2/super.c

···
 		mlog_errno(status);
 		goto bail;
 	}
-	cleancache_init_shared_fs((char *)&di->id2.i_super.s_uuid, sb);
+	cleancache_init_shared_fs(sb);
 
 bail:
 	return status;

include/linux/cleancache.h

···
 extern struct cleancache_ops *
 	cleancache_register_ops(struct cleancache_ops *ops);
 extern void __cleancache_init_fs(struct super_block *);
-extern void __cleancache_init_shared_fs(char *, struct super_block *);
+extern void __cleancache_init_shared_fs(struct super_block *);
 extern int  __cleancache_get_page(struct page *);
 extern void __cleancache_put_page(struct page *);
 extern void __cleancache_invalidate_page(struct address_space *, struct page *);
···
 		__cleancache_init_fs(sb);
 }
 
-static inline void cleancache_init_shared_fs(char *uuid, struct super_block *sb)
+static inline void cleancache_init_shared_fs(struct super_block *sb)
 {
 	if (cleancache_enabled)
-		__cleancache_init_shared_fs(uuid, sb);
+		__cleancache_init_shared_fs(sb);
 }
 
 static inline int cleancache_get_page(struct page *page)

mm/cleancache.c

···
 EXPORT_SYMBOL(__cleancache_init_fs);
 
 /* Called by a cleancache-enabled clustered filesystem at time of mount */
-void __cleancache_init_shared_fs(char *uuid, struct super_block *sb)
+void __cleancache_init_shared_fs(struct super_block *sb)
 {
 	int i;
 
···
 	for (i = 0; i < MAX_INITIALIZABLE_FS; i++) {
 		if (shared_fs_poolid_map[i] == FS_UNKNOWN) {
 			sb->cleancache_poolid = i + FAKE_SHARED_FS_POOLID_OFFSET;
-			uuids[i] = uuid;
+			uuids[i] = sb->s_uuid;
 			if (cleancache_ops)
 				shared_fs_poolid_map[i] = cleancache_ops->init_shared_fs
-						(uuid, PAGE_SIZE);
+						(sb->s_uuid, PAGE_SIZE);
 			else
 				shared_fs_poolid_map[i] = FS_NO_BACKEND;
 			break;