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 
 11 int ultrix_partition(struct parsed_partitions *state, struct block_device *bdev)
 12 {
 13         int i;
 14         Sector sect;
 15         unsigned char *data;
 16         struct ultrix_disklabel {
 17                 s32     pt_magic;       /* magic no. indicating part. info exits */
 18                 s32     pt_valid;       /* set by driver if pt is current */
 19                 struct  pt_info {
 20                         s32             pi_nblocks; /* no. of sectors */
 21                         u32             pi_blkoff;  /* block offset for start */
 22                 } pt_part[8];
 23         } *label;
 24 
 25 #define PT_MAGIC        0x032957        /* Partition magic number */
 26 #define PT_VALID        1               /* Indicates if struct is valid */
 27 
 28         data = read_dev_sector(bdev, (16384 - sizeof(*label))/512, &sect);
 29         if (!data)
 30                 return -1;
 31         
 32         label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));
 33 
 34         if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
 35                 for (i=0; i<8; i++)
 36                         if (label->pt_part[i].pi_nblocks)
 37                                 put_partition(state, i+1, 
 38                                               label->pt_part[i].pi_blkoff,
 39                                               label->pt_part[i].pi_nblocks);
 40                 put_dev_sector(sect);
 41                 printk ("\n");
 42                 return 1;
 43         } else {
 44                 put_dev_sector(sect);
 45                 return 0;
 46         }
 47 }
 48
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