Linux Kernel  3.7.1
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ultrix.c
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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 
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_part_sector(state, (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  strlcat(state->pp_buf, "\n", PAGE_SIZE);
43  return 1;
44  } else {
45  put_dev_sector(sect);
46  return 0;
47  }
48 }