Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ] 
  1 /*
  2  *  fs/partitions/ultrix.c
  3  *
  4  *  Code extracted from drivers/block/genhd.c
  5  *
  6  *  Re-organised Jul 1999 Russell King
  7  */
  8 
  9 #include "check.h"
 10 #include "ultrix.h"
 11 
 12 int ultrix_partition(struct parsed_partitions *state, struct block_device *bdev)
 13 {
 14         int i;
 15         Sector sect;
 16         unsigned char *data;
 17         struct ultrix_disklabel {
 18                 s32     pt_magic;       /* magic no. indicating part. info exits */
 19                 s32     pt_valid;       /* set by driver if pt is current */
 20                 struct  pt_info {
 21                         s32             pi_nblocks; /* no. of sectors */
 22                         u32             pi_blkoff;  /* block offset for start */
 23                 } pt_part[8];
 24         } *label;
 25 
 26 #define PT_MAGIC        0x032957        /* Partition magic number */
 27 #define PT_VALID        1               /* Indicates if struct is valid */
 28 
 29         data = read_dev_sector(bdev, (16384 - sizeof(*label))/512, &sect);
 30         if (!data)
 31                 return -1;
 32         
 33         label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));
 34 
 35         if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
 36                 for (i=0; i<8; i++)
 37                         if (label->pt_part[i].pi_nblocks)
 38                                 put_partition(state, i+1, 
 39                                               label->pt_part[i].pi_blkoff,
 40                                               label->pt_part[i].pi_nblocks);
 41                 put_dev_sector(sect);
 42                 printk ("\n");
 43                 return 1;
 44         } else {
 45                 put_dev_sector(sect);
 46                 return 0;
 47         }
 48 }
 49
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