[PATCH] large dev_t - second series (8/15)

	kdev_t, to_kdev_t(), etc. are gone - there is no more objects
of that type and no remaining callers of these functions.

drivers/s390/char/tape_core.c

@@ -178,7 +178,7 @@ tape_assign_minor(struct tape_device *device)
 			break;
 		minor += TAPE_MINORS_PER_DEV;
 	}
-	if (minor >= (1 << KDEV_MINOR_BITS)) {
+	if (minor >= 256) {
 		write_unlock(&tape_device_lock);
 		return -ENODEV;
 	}

drivers/s390/char/tape_proc.c

@@ -80,7 +80,7 @@ static int tape_proc_show(struct seq_file *m, void *v)
 
 static void *tape_proc_start(struct seq_file *m, loff_t *pos)
 {
-	if (*pos >= (1 << KDEV_MINOR_BITS) / TAPE_MINORS_PER_DEV)
+	if (*pos >= 256 / TAPE_MINORS_PER_DEV)
 		return NULL;
 	return (void *)((unsigned long) *pos + 1);
 }

drivers/scsi/sg.c

@@ -83,7 +83,7 @@ static void sg_proc_cleanup(void);
 #define SG_ALLOW_DIO_DEF 0
 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
 
-#define SG_MAX_DEVS_MASK ((1U << KDEV_MINOR_BITS) - 1)
+#define SG_MAX_DEVS_MASK (256 - 1)
 
 /*
  * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)

drivers/scsi/sr.c

@@ -59,7 +59,7 @@
 MODULE_PARM(xa_test, "i");	/* see sr_ioctl.c */
 
 
-#define SR_DISKS	(1 << KDEV_MINOR_BITS)
+#define SR_DISKS	256
 
 #define MAX_RETRIES	3
 #define SR_TIMEOUT	(30 * HZ)

include/linux/kdev_t.h

 #ifndef _LINUX_KDEV_T_H
 #define _LINUX_KDEV_T_H
 #ifdef __KERNEL__
-/*
-As a preparation for the introduction of larger device numbers,
-we introduce a type kdev_t to hold them. No information about
-this type is known outside of this include file.
-
-Objects of type kdev_t designate a device. Outside of the kernel
-the corresponding things are objects of type dev_t - usually an
-integral type with the device major and minor in the high and low
-bits, respectively. Conversion is done by
-
-extern kdev_t to_kdev_t(int);
-
-It is up to the various file systems to decide how objects of type
-dev_t are stored on disk.
-The only other point of contact between kernel and outside world
-are the system calls stat and mknod, new versions of which will
-eventually have to be used in libc.
-
-[Unfortunately, the floppy control ioctls fail to hide the internal
-kernel structures, and the fd_device field of a struct floppy_drive_struct
-is user-visible. So, it remains a dev_t for the moment, with some ugly
-conversions in floppy.c.]
-
-Inside the kernel, we aim for a kdev_t type that is a pointer
-to a structure with information about the device (like major,
-minor, size, blocksize, sectorsize, name, read-only flag,
-struct file_operations etc.).
-
-However, for the time being we let kdev_t be almost the same as dev_t:
-
-typedef struct { unsigned short major, minor; } kdev_t;
-
-Admissible operations on an object of type kdev_t:
-- passing it along
-- comparing it for equality with another such object
-- storing it in inode->i_rdev or tty->device
-- using its bit pattern as argument in a hash function
-- finding its major and minor
-- complaining about it
-
-An object of type kdev_t is created only by the function MKDEV(),
-with the single exception of the constant 0 (no device).
-
-Right now the other information mentioned above is usually found
-in static arrays indexed by major or major,minor.
-
-An obstacle to immediately using
-    typedef struct { ... (* lots of information *) } *kdev_t
-is the case of mknod used to create a block device that the
-kernel doesn't know about at present (but first learns about
-when some module is inserted).
-
-aeb - 950811
-*/
-
-
-/*
- * NOTE NOTE NOTE!
- *
- * The kernel-internal "kdev_t" will eventually have
- * 20 bits for minor numbers, and 12 bits for majors.
- *
- * HOWEVER, the external representation is still 8+8
- * bits, and there is no way to generate the extended
- * "kdev_t" format yet. Which is just as well, since
- * we still use "minor" as an index into various
- * static arrays, and they are sized for a 8-bit index.
- */
-typedef struct {
-	unsigned short value;
-} kdev_t;
-
-#define KDEV_MINOR_BITS		8
-#define KDEV_MAJOR_BITS		8
-
-#define __mkdev(major,minor)	(((major) << KDEV_MINOR_BITS) + (minor))
-
-#define mk_kdev(major, minor)	((kdev_t) { __mkdev(major,minor) } )
-
-#define NODEV		(mk_kdev(0,0))
-
-/* Mask off the high bits for now.. */
-#define minor(dev)	((dev).value & 0xff)
-#define major(dev)	(((dev).value >> KDEV_MINOR_BITS) & 0xff)
-
 /* These are for user-level "dev_t" */
 #define MINORBITS	8
 #define MINORMASK	((1U << MINORBITS) - 1)
@@ -94,20 +9,6 @@ typedef struct {
 #define MINOR(dev)	((unsigned int) ((dev) & MINORMASK))
 #define MKDEV(ma,mi)	(((ma) << MINORBITS) | (mi))
 
-/*
- * Conversion functions
- */
-
-static inline int kdev_t_to_nr(kdev_t dev)
-{
-	return MKDEV(major(dev), minor(dev));
-}
-
-static inline kdev_t to_kdev_t(int dev)
-{
-	return mk_kdev(MAJOR(dev),MINOR(dev));
-}
-
 #define print_dev_t(buffer, dev)					\
 	sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev))
 

net/unix/af_unix.c

@@ -57,7 +57,7 @@
  *	[TO FIX]
  *	ECONNREFUSED is not returned from one end of a connected() socket to the
  *		other the moment one end closes.
- *	fstat() doesn't return st_dev=NODEV, and give the blksize as high water mark
+ *	fstat() doesn't return st_dev=0, and give the blksize as high water mark
  *		and a fake inode identifier (nor the BSD first socket fstat twice bug).
  *	[NOT TO FIX]
  *	accept() returns a path name even if the connecting socket has closed