sun.c

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    1 /*
    2  *  fs/partitions/sun.c
    3  *
    4  *  Code extracted from drivers/block/genhd.c
    5  *
    6  *  Copyright (C) 1991-1998  Linus Torvalds
    7  *  Re-organised Feb 1998 Russell King
    8  */
    9 
   10 #include <linux/config.h>
   11 #include <linux/fs.h>
   12 #include <linux/genhd.h>
   13 #include <linux/kernel.h>
   14 #include <linux/major.h>
   15 #include <linux/string.h>
   16 #include <linux/blk.h>
   17 
   18 #include <asm/system.h>
   19 
   20 #include "check.h"
   21 #include "sun.h"
   22 
   23 #ifdef CONFIG_BLK_DEV_MD
   24 extern void md_autodetect_dev(kdev_t dev);
   25 #endif
   26 
   27 int sun_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor)
   28 {
   29         int i, csum;
   30         unsigned short *ush;
   31         Sector sect;
   32         kdev_t dev = to_kdev_t(bdev->bd_dev);
   33         struct sun_disklabel {
   34                 unsigned char info[128];   /* Informative text string */
   35                 unsigned char spare0[14];
   36                 struct sun_info {
   37                         unsigned char spare1;
   38                         unsigned char id;
   39                         unsigned char spare2;
   40                         unsigned char flags;
   41                 } infos[8];
   42                 unsigned char spare[246];  /* Boot information etc. */
   43                 unsigned short rspeed;     /* Disk rotational speed */
   44                 unsigned short pcylcount;  /* Physical cylinder count */
   45                 unsigned short sparecyl;   /* extra sects per cylinder */
   46                 unsigned char spare2[4];   /* More magic... */
   47                 unsigned short ilfact;     /* Interleave factor */
   48                 unsigned short ncyl;       /* Data cylinder count */
   49                 unsigned short nacyl;      /* Alt. cylinder count */
   50                 unsigned short ntrks;      /* Tracks per cylinder */
   51                 unsigned short nsect;      /* Sectors per track */
   52                 unsigned char spare3[4];   /* Even more magic... */
   53                 struct sun_partition {
   54                         __u32 start_cylinder;
   55                         __u32 num_sectors;
   56                 } partitions[8];
   57                 unsigned short magic;      /* Magic number */
   58                 unsigned short csum;       /* Label xor'd checksum */
   59         } * label;              
   60         struct sun_partition *p;
   61         unsigned long spc;
   62 
   63         label = (struct sun_disklabel *)read_dev_sector(bdev, 0, &sect);
   64         if (!label)
   65                 return -1;
   66 
   67         p = label->partitions;
   68         if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
   69 /*              printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
   70                        bdevname(dev), be16_to_cpu(label->magic)); */
   71                 put_dev_sector(sect);
   72                 return 0;
   73         }
   74         /* Look at the checksum */
   75         ush = ((unsigned short *) (label+1)) - 1;
   76         for (csum = 0; ush >= ((unsigned short *) label);)
   77                 csum ^= *ush--;
   78         if (csum) {
   79                 printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
   80                        bdevname(dev));
   81                 put_dev_sector(sect);
   82                 return 0;
   83         }
   84 
   85         /* All Sun disks have 8 partition entries */
   86         spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
   87         for (i = 0; i < 8; i++, p++) {
   88                 unsigned long st_sector;
   89                 int num_sectors;
   90 
   91                 st_sector = first_sector + be32_to_cpu(p->start_cylinder) * spc;
   92                 num_sectors = be32_to_cpu(p->num_sectors);
   93                 if (num_sectors) {
   94                         add_gd_partition(hd, first_part_minor,
   95                                          st_sector, num_sectors);
   96 #ifdef CONFIG_BLK_DEV_MD
   97                         if (label->infos[i].id == LINUX_RAID_PARTITION)
   98                                 md_autodetect_dev(MKDEV(hd->major,
   99                                                         first_part_minor));
  100 #endif
  101                 }
  102                 first_part_minor++;
  103         }
  104         printk("\n");
  105         put_dev_sector(sect);
  106         return 1;
  107 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/partitions/sun.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/partitions/sun.c