sgi.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*
    2  *  fs/partitions/sgi.c
    3  *
    4  *  Code extracted from drivers/block/genhd.c
    5  */
    6 
    7 #include <linux/fs.h>
    8 #include <linux/genhd.h>
    9 #include <linux/kernel.h>
   10 #include <linux/major.h>
   11 #include <linux/string.h>
   12 #include <linux/blk.h>
   13 
   14 #include <asm/byteorder.h>
   15 #include <asm/system.h>
   16 
   17 #include "check.h"
   18 #include "sgi.h"
   19 
   20 int sgi_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int current_minor)
   21 {
   22         int i, csum, magic;
   23         unsigned int *ui, start, blocks, cs;
   24         Sector sect;
   25         kdev_t dev = to_kdev_t(bdev->bd_dev);
   26         struct sgi_disklabel {
   27                 int magic_mushroom;         /* Big fat spliff... */
   28                 short root_part_num;        /* Root partition number */
   29                 short swap_part_num;        /* Swap partition number */
   30                 char boot_file[16];         /* Name of boot file for ARCS */
   31                 unsigned char _unused0[48]; /* Device parameter useless crapola.. */
   32                 struct sgi_volume {
   33                         char name[8];       /* Name of volume */
   34                         int  block_num;     /* Logical block number */
   35                         int  num_bytes;     /* How big, in bytes */
   36                 } volume[15];
   37                 struct sgi_partition {
   38                         int num_blocks;     /* Size in logical blocks */
   39                         int first_block;    /* First logical block */
   40                         int type;           /* Type of this partition */
   41                 } partitions[16];
   42                 int csum;                   /* Disk label checksum */
   43                 int _unused1;               /* Padding */
   44         } *label;
   45         struct sgi_partition *p;
   46 
   47         label = (struct sgi_disklabel *) read_dev_sector(bdev, 0, &sect);
   48         if (!label)
   49                 return -1;
   50         p = &label->partitions[0];
   51         magic = label->magic_mushroom;
   52         if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
   53                 /*printk("Dev %s SGI disklabel: bad magic %08x\n",
   54                        bdevname(dev), magic);*/
   55                 put_dev_sector(sect);
   56                 return 0;
   57         }
   58         ui = ((unsigned int *) (label + 1)) - 1;
   59         for(csum = 0; ui >= ((unsigned int *) label);) {
   60                 cs = *ui--;
   61                 csum += be32_to_cpu(cs);
   62         }
   63         if(csum) {
   64                 printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
   65                        bdevname(dev));
   66                 put_dev_sector(sect);
   67                 return 0;
   68         }
   69         /* All SGI disk labels have 16 partitions, disks under Linux only
   70          * have 15 minor's.  Luckily there are always a few zero length
   71          * partitions which we don't care about so we never overflow the
   72          * current_minor.
   73          */
   74         for(i = 0; i < 16; i++, p++) {
   75                 blocks = be32_to_cpu(p->num_blocks);
   76                 start  = be32_to_cpu(p->first_block);
   77                 if(!blocks)
   78                         continue;
   79                 add_gd_partition(hd, current_minor, start, blocks);
   80                 current_minor++;
   81         }
   82         printk("\n");
   83         put_dev_sector(sect);
   84         return 1;
   85 }

Cache object: 9c1229198eccdf5fd8e8fe16fba8c129

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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