patch-2.2.18 linux/drivers/scsi/seagate.c

• Lines: 133
• Date: Thu Aug 31 15:34:27 2000
• Orig file: v2.2.17/drivers/scsi/seagate.c
• Orig date: Sun Jun 11 21:44:17 2000

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/scsi/seagate.c linux/drivers/scsi/seagate.c
@@ -1708,124 +1708,16 @@
   return SCSI_RESET_WAKEUP;
 }
 
-
-int seagate_st0x_biosparam (Disk * disk, kdev_t dev, int *ip)
-{
-  unsigned char buf[256 + sizeof (Scsi_Ioctl_Command)], 
-                cmd[6], *data, *page;
-  Scsi_Ioctl_Command *sic = (Scsi_Ioctl_Command *) buf;
-  int result, formatted_sectors, total_sectors;
-  int cylinders, heads, sectors;
-  int capacity;
-
 /*
- * Only SCSI-I CCS drives and later implement the necessary mode sense
- * pages.
+ * There used to be some biosparam() code here, but the
+ * author misunderstood the purpose of this routine and
+ * tried to determine physical reality by reading mode
+ * sense pages and the like. But that yields values like
+ * 424 sectors/track, completely unusable for partition tables.
+ * (And after the translation part we may have heads > 255,
+ * equally unusable.)
+ * So, we delete all of this stuff and rely on the defaults.
  */
-
-  if (disk->device->scsi_level < 2)
-    return -1;
-
-  data = sic->data;
-
-  cmd[0] = MODE_SENSE;
-  cmd[1] = (disk->device->lun << 5) & 0xe5;
-  cmd[2] = 0x04;                        /* Read page 4, rigid disk geometry
-                                           page current values */
-  cmd[3] = 0;
-  cmd[4] = 255;
-  cmd[5] = 0;
-
-/*
- * We are transferring 0 bytes in the out direction, and expect to get back
- * 24 bytes for each mode page.
- */
-  sic->inlen = 0;
-  sic->outlen = 256;
-
-  memcpy (data, cmd, 6);
-
-  if (!(result = kernel_scsi_ioctl (disk->device, SCSI_IOCTL_SEND_COMMAND,
-                                    sic)))
-  {
-/*
- * The mode page lies beyond the MODE SENSE header, with length 4, and
- * the BLOCK DESCRIPTOR, with length header[3].
- */
-    page = data + 4 + data[3];
-    heads = (int) page[5];
-    cylinders = (page[2] << 16) | (page[3] << 8) | page[4];
-
-    cmd[2] = 0x03;                      /* Read page 3, format page current
-                                           values */
-    memcpy (data, cmd, 6);
-
-    if (!(result = kernel_scsi_ioctl (disk->device, SCSI_IOCTL_SEND_COMMAND,
-                                      sic)))
-    {
-      page = data + 4 + data[3];
-      sectors = (page[10] << 8) | page[11];
-/*
- * Get the total number of formatted sectors from the block descriptor,
- * so we can tell how many are being used for alternates.
- */
-      formatted_sectors = (data[4 + 1] << 16) | (data[4 + 2] << 8) 
-                          | data[4 + 3];
-
-      total_sectors = (heads * cylinders * sectors);
-
-/*
- * Adjust the real geometry by subtracting
- * (spare sectors / (heads * tracks)) cylinders from the number of cylinders.
- *
- * It appears that the CE cylinder CAN be a partial cylinder.
- */
-
-      printk ("scsi%d : heads = %d cylinders = %d sectors = %d total = %d formatted = %d\n",
-              hostno, heads, cylinders, sectors, total_sectors,
-              formatted_sectors);
-
-      if (!heads || !sectors || !cylinders)
-        result = -1;
-      else
-        cylinders -= ((total_sectors - formatted_sectors) / (heads * sectors));
-
-/*
- * Now, we need to do a sanity check on the geometry to see if it is
- * BIOS compatible.  The maximum BIOS geometry is 1024 cylinders *
- * 256 heads * 64 sectors.
- */
-
-      if ((cylinders > 1024) || (sectors > 64))
-      {
-        /* The Seagate's seem to have some mapping.  Multiply
-           heads*sectors*cyl to get capacity.  Then start rounding down.
-         */
-        capacity = heads * sectors * cylinders;         
-      
-        /* Old MFM Drives use this, so does the Seagate */
-        sectors = 17;
-        heads = 2;
-        capacity = capacity / sectors;
-        while (cylinders > 1024)
-        {
-          heads *= 2;                   /* For some reason, they go in
-                                           multiples */
-          cylinders = capacity / heads;
-        }
-      }
-      ip[0] = heads;
-      ip[1] = sectors;
-      ip[2] = cylinders;
-/*
- * There should be an alternate mapping for things the seagate doesn't
- * understand, but I couldn't say what it is with reasonable certainty.
- */
-    }
-  }
-
-  return result;
-}
 
 #ifdef MODULE
 /* Eventually this will go into an include file, but this will be later */