[PATCH] s390: use normal switch statement for ioctls in dasd_ioctlc

Handle ioctls implemented in dasd_ioctl through the normal switch statement
that most drivers use instead of the awkward dasd_ioctl_no_register routine.
This avoids searching a linear list on every call to dasd_ioctl(), and allows
to give the various ioctl implementation functions sane prototypes, aswell as
moving the check for bdev->bd_disk->private_data from the individual functions
to dasd_ioctl.  (I think it can't actually every be NULL, but let's keep that
for later)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/s390/block/dasd.c

@@ -1807,7 +1807,6 @@ dasd_exit(void)
 #ifdef CONFIG_PROC_FS
 	dasd_proc_exit();
 #endif
-	dasd_ioctl_exit();
         if (dasd_page_cache != NULL) {
 		kmem_cache_destroy(dasd_page_cache);
 		dasd_page_cache = NULL;
@@ -2093,9 +2092,6 @@ dasd_init(void)
 	rc = dasd_parse();
 	if (rc)
 		goto failed;
-	rc = dasd_ioctl_init();
-	if (rc)
-		goto failed;
 #ifdef CONFIG_PROC_FS
 	rc = dasd_proc_init();
 	if (rc)

drivers/s390/block/dasd_int.h

@@ -523,8 +523,6 @@ int dasd_scan_partitions(struct dasd_device *);
 void dasd_destroy_partitions(struct dasd_device *);
 
 /* externals in dasd_ioctl.c */
-int  dasd_ioctl_init(void);
-void dasd_ioctl_exit(void);
 int  dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
 int  dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
 int  dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);