[PATCH] kill ide-geometry

I consider myself the maintainer of this code, created the file,
want to destroy it again. It is unused and incorrect today.

Documentation/ide.txt

@@ -230,6 +230,10 @@ Summary of ide driver parameters for kernel command line
  "hdx=cdrom"		: drive is present, and is a cdrom drive
  
  "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
+
+ "hdx=remap"		: remap access of sector 0 to sector 1 (for EZD)
+
+ "hdx=remap63"		: remap the drive: shift all by 63 sectors (for DM)
  
  "hdx=autotune"		: driver will attempt to tune interface speed
 			  to the fastest PIO mode supported,

drivers/ide/Makefile

@@ -12,7 +12,7 @@ obj-$(CONFIG_BLK_DEV_IDEPCI)		+= pci/
 
 # Core IDE code - must come before legacy
 
-obj-$(CONFIG_BLK_DEV_IDE)		+= ide-io.o ide-probe.o ide-geometry.o ide-iops.o ide-taskfile.o ide.o ide-lib.o ide-default.o
+obj-$(CONFIG_BLK_DEV_IDE)		+= ide-io.o ide-probe.o ide-iops.o ide-taskfile.o ide.o ide-lib.o ide-default.o
 obj-$(CONFIG_BLK_DEV_IDEDISK)		+= ide-disk.o
 obj-$(CONFIG_BLK_DEV_IDECD)		+= ide-cd.o
 obj-$(CONFIG_BLK_DEV_IDETAPE)		+= ide-tape.o

drivers/ide/ide-geometry.c

-/*
- * linux/drivers/ide/ide-geometry.c
- */
-#include <linux/config.h>
-#include <linux/ide.h>
-#include <linux/mc146818rtc.h>
-#include <asm/io.h>
-
-extern unsigned long current_capacity (ide_drive_t *);
-
-/*
- * If heads is nonzero: find a translation with this many heads and S=63.
- * Otherwise: find out how OnTrack Disk Manager would translate the disk.
- */
-
-static void ontrack(ide_drive_t *drive, int heads, unsigned int *c, int *h, int *s) 
-{
-	static const u8 dm_head_vals[] = {4, 8, 16, 32, 64, 128, 255, 0};
-	const u8 *headp = dm_head_vals;
-	unsigned long total;
-
-	/*
-	 * The specs say: take geometry as obtained from Identify,
-	 * compute total capacity C*H*S from that, and truncate to
-	 * 1024*255*63. Now take S=63, H the first in the sequence
-	 * 4, 8, 16, 32, 64, 128, 255 such that 63*H*1024 >= total.
-	 * [Please tell aeb@cwi.nl in case this computes a
-	 * geometry different from what OnTrack uses.]
-	 */
-	total = DRIVER(drive)->capacity(drive);
-
-	*s = 63;
-
-	if (heads) {
-		*h = heads;
-		*c = total / (63 * heads);
-		return;
-	}
-
-	while (63 * headp[0] * 1024 < total && headp[1] != 0)
-		 headp++;
-	*h = headp[0];
-	*c = total / (63 * headp[0]);
-}
-
-/*
- * This routine is called from the partition-table code in pt/msdos.c.
- * It has two tasks:
- * (i) to handle Ontrack DiskManager by offsetting everything by 63 sectors,
- *  or to handle EZdrive by remapping sector 0 to sector 1.
- * (ii) to invent a translated geometry.
- * Part (i) is suppressed if the user specifies the "noremap" option
- * on the command line.
- * Part (ii) is suppressed if the user specifies an explicit geometry.
- *
- * The ptheads parameter is either 0 or tells about the number of
- * heads shown by the end of the first nonempty partition.
- * If this is either 16, 32, 64, 128, 240 or 255 we'll believe it.
- *
- * The xparm parameter has the following meaning:
- *	 0 = convert to CHS with fewer than 1024 cyls
- *	     using the same method as Ontrack DiskManager.
- *	 1 = same as "0", plus offset everything by 63 sectors.
- *	-1 = similar to "0", plus redirect sector 0 to sector 1.
- *	 2 = convert to a CHS geometry with "ptheads" heads.
- *
- * Returns 0 if the translation was not possible, if the device was not 
- * an IDE disk drive, or if a geometry was "forced" on the commandline.
- * Returns 1 if the geometry translation was successful.
- */
-
-int ide_xlate_1024 (struct block_device *bdev, int xparm, int ptheads, const char *msg)
-{
-	ide_drive_t *drive = bdev->bd_disk->private_data;
-	const char *msg1 = "";
-	int heads = 0;
-	int c, h, s;
-	int transl = 1;		/* try translation */
-	int ret = 0;
-
-	/* remap? */
-	if (drive->remap_0_to_1 != 2) {
-		if (xparm == 1) {		/* DM */
-			drive->sect0 = 63;
-			msg1 = " [remap +63]";
-			ret = 1;
-		} else if (xparm == -1) {	/* EZ-Drive */
-			if (drive->remap_0_to_1 == 0) {
-				drive->remap_0_to_1 = 1;
-				msg1 = " [remap 0->1]";
-				ret = 1;
-			}
-		}
-	}
-
-	/* There used to be code here that assigned drive->id->CHS
-	   to drive->CHS and that to drive->bios_CHS. However,
-	   some disks have id->C/H/S = 4092/16/63 but are larger than 2.1 GB.
-	   In such cases that code was wrong.  Moreover,
-	   there seems to be no reason to do any of these things. */
-
-	/* translate? */
-	if (drive->forced_geom)
-		transl = 0;
-
-	/* does ptheads look reasonable? */
-	if (ptheads == 32 || ptheads == 64 || ptheads == 128 ||
-	    ptheads == 240 || ptheads == 255)
-		heads = ptheads;
-
-	if (xparm == 2) {
-		if (!heads ||
-		   (drive->bios_head >= heads && drive->bios_sect == 63))
-			transl = 0;
-	}
-	if (xparm == -1) {
-		if (drive->bios_head > 16)
-			transl = 0;     /* we already have a translation */
-	}
-
-	if (transl) {
-		ontrack(drive, heads, &c, &h, &s);
-		drive->bios_cyl = c;
-		drive->bios_head = h;
-		drive->bios_sect = s;
-		ret = 1;
-	}
-
-	set_capacity(drive->disk, current_capacity(drive));
-
-	if (ret)
-		printk("%s%s [%d/%d/%d]", msg, msg1,
-		       drive->bios_cyl, drive->bios_head, drive->bios_sect);
-	return ret;
-}

drivers/ide/ide-probe.c

@@ -1443,8 +1443,6 @@ int ideprobe_init (void)
 }
 
 #ifdef MODULE
-extern int (*ide_xlate_1024_hook)(struct block_device *, int, int, const char *);
-
 int init_module (void)
 {
 	unsigned int index;
@@ -1453,14 +1451,12 @@ int init_module (void)
 		ide_unregister(index);
 	ideprobe_init();
 	create_proc_ide_interfaces();
-	ide_xlate_1024_hook = ide_xlate_1024;
 	return 0;
 }
 
 void cleanup_module (void)
 {
 	ide_probe = NULL;
-	ide_xlate_1024_hook = 0;
 }
 MODULE_LICENSE("GPL");
 #endif /* MODULE */

drivers/ide/ide.c

@@ -1735,6 +1735,8 @@ static int __initdata is_chipset_set[MAX_HWIFS];
  * "hdx=nowerr"		: ignore the WRERR_STAT bit on this drive
  * "hdx=cdrom"		: drive is present, and is a cdrom drive
  * "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
+ * "hdx=remap63"	: add 63 to all sector numbers (for OnTrack DM)
+ * "hdx=remap"		: remap 0->1 (for EZDrive)
  * "hdx=noremap"	: do not remap 0->1 even though EZD was detected
  * "hdx=autotune"	: driver will attempt to tune interface speed
  *				to the fastest PIO mode supported,
@@ -1854,11 +1856,11 @@ int __init ide_setup (char *s)
 	 * Look for drive options:  "hdx="
 	 */
 	if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
-		const char *hd_words[] = {"none", "noprobe", "nowerr", "cdrom",
-				"serialize", "autotune", "noautotune",
-				"slow", "swapdata", "bswap", "flash",
-				"remap", "noremap", "scsi", "biostimings",
-				NULL};
+		const char *hd_words[] = {
+			"none", "noprobe", "nowerr", "cdrom", "serialize",
+			"autotune", "noautotune", "slow", "swapdata", "bswap",
+			"flash", "remap", "noremap", "scsi", "biostimings",
+			"remap63", NULL };
 		unit = s[2] - 'a';
 		hw   = unit / MAX_DRIVES;
 		unit = unit % MAX_DRIVES;
@@ -1908,8 +1910,8 @@ int __init ide_setup (char *s)
 			case -8: /* "slow" */
 				drive->slow = 1;
 				goto done;
-			case -9: /* "swapdata" or "bswap" */
-			case -10:
+			case -9: /* "swapdata" */
+			case -10: /* "bswap" */
 				drive->bswap = 1;
 				goto done;
 			case -11: /* "flash" */
@@ -1932,6 +1934,9 @@ int __init ide_setup (char *s)
 			case -15: /* "biostimings" */
 				drive->autotune = IDE_TUNE_BIOS;
 				goto done;
+			case -16: /* "remap63" */
+				drive->sect0 = 63;
+				goto done;
 			case 3: /* cyl,head,sect */
 				drive->media	= ide_disk;
 				drive->cyl	= drive->bios_cyl  = vals[0];

fs/partitions/msdos.c

@@ -20,27 +20,15 @@
  */
 
 #include <linux/config.h>
-#include <linux/buffer_head.h>		/* for invalidate_bdev() */
-
-#ifdef CONFIG_BLK_DEV_IDE
-#include <linux/hdreg.h>
-#include <linux/ide.h>	/* IDE xlate */
-#elif defined(CONFIG_BLK_DEV_IDE_MODULE)
-#include <linux/module.h>
-
-int (*ide_xlate_1024_hook)(struct block_device *, int, int, const char *);
-EXPORT_SYMBOL(ide_xlate_1024_hook);
-#define ide_xlate_1024 ide_xlate_1024_hook
-#endif
 
 #include "check.h"
 #include "msdos.h"
 #include "efi.h"
 
 /*
- * Many architectures don't like unaligned accesses, which is
- * frequently the case with the nr_sects and start_sect partition
- * table entries.
+ * Many architectures don't like unaligned accesses, while
+ * the nr_sects and start_sect partition table entries are
+ * at a 2 (mod 4) address.
  */
 #include <asm/unaligned.h>
 

include/linux/ide.h

@@ -1298,12 +1298,6 @@ extern void ide_fixstring(u8 *, const int, const int);
  */
 extern int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);
 
-/*
- * This routine is called from the partition-table code in genhd.c
- * to "convert" a drive to a logical geometry with fewer than 1024 cyls.
- */
-extern int ide_xlate_1024(struct block_device *, int, int, const char *);
-
 /*
  * Return the current idea about the total capacity of this drive.
  */