4 * Code extracted from drivers/block/genhd.c
10 struct sgi_disklabel {
11 __be32 magic_mushroom; /* Big fat spliff... */
12 __be16 root_part_num; /* Root partition number */
13 __be16 swap_part_num; /* Swap partition number */
14 s8 boot_file[16]; /* Name of boot file for ARCS */
15 u8 _unused0[48]; /* Device parameter useless crapola.. */
17 s8 name[8]; /* Name of volume */
18 __be32 block_num; /* Logical block number */
19 __be32 num_bytes; /* How big, in bytes */
21 struct sgi_partition {
22 __be32 num_blocks; /* Size in logical blocks */
23 __be32 first_block; /* First logical block */
24 __be32 type; /* Type of this partition */
26 __be32 csum; /* Disk label checksum */
27 __be32 _unused1; /* Padding */
30 int sgi_partition(struct parsed_partitions *state, struct block_device *bdev)
35 unsigned int start, blocks;
38 struct sgi_disklabel *label;
39 struct sgi_partition *p;
40 char b[BDEVNAME_SIZE];
42 label = (struct sgi_disklabel *) read_dev_sector(bdev, 0, §);
45 p = &label->partitions[0];
46 magic = label->magic_mushroom;
47 if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
48 /*printk("Dev %s SGI disklabel: bad magic %08x\n",
49 bdevname(bdev, b), be32_to_cpu(magic));*/
53 ui = ((__be32 *) (label + 1)) - 1;
54 for(csum = 0; ui >= ((__be32 *) label);) {
56 csum += be32_to_cpu(cs);
59 printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
64 /* All SGI disk labels have 16 partitions, disks under Linux only
65 * have 15 minor's. Luckily there are always a few zero length
66 * partitions which we don't care about so we never overflow the
69 for(i = 0; i < 16; i++, p++) {
70 blocks = be32_to_cpu(p->num_blocks);
71 start = be32_to_cpu(p->first_block);
73 put_partition(state, slot, start, blocks);
74 if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
75 state->parts[slot].flags = ADDPART_FLAG_RAID;