1/*
2 *  fs/partitions/sun.c
3 *
4 *  Code extracted from drivers/block/genhd.c
5 *
6 *  Copyright (C) 1991-1998  Linus Torvalds
7 *  Re-organised Feb 1998 Russell King
8 */
9
10#include "check.h"
11#include "sun.h"
12
13int sun_partition(struct parsed_partitions *state)
14{
15	int i;
16	__be16 csum;
17	int slot = 1;
18	__be16 *ush;
19	Sector sect;
20	struct sun_disklabel {
21		unsigned char info[128];   /* Informative text string */
22		struct sun_vtoc {
23		    __be32 version;     /* Layout version */
24		    char   volume[8];   /* Volume name */
25		    __be16 nparts;      /* Number of partitions */
26		    struct sun_info {           /* Partition hdrs, sec 2 */
27			__be16 id;
28			__be16 flags;
29		    } infos[8];
30		    __be16 padding;     /* Alignment padding */
31		    __be32 bootinfo[3];  /* Info needed by mboot */
32		    __be32 sanity;       /* To verify vtoc sanity */
33		    __be32 reserved[10]; /* Free space */
34		    __be32 timestamp[8]; /* Partition timestamp */
35		} vtoc;
36		__be32 write_reinstruct; /* sectors to skip, writes */
37		__be32 read_reinstruct;  /* sectors to skip, reads */
38		unsigned char spare[148]; /* Padding */
39		__be16 rspeed;     /* Disk rotational speed */
40		__be16 pcylcount;  /* Physical cylinder count */
41		__be16 sparecyl;   /* extra sects per cylinder */
42		__be16 obs1;       /* gap1 */
43		__be16 obs2;       /* gap2 */
44		__be16 ilfact;     /* Interleave factor */
45		__be16 ncyl;       /* Data cylinder count */
46		__be16 nacyl;      /* Alt. cylinder count */
47		__be16 ntrks;      /* Tracks per cylinder */
48		__be16 nsect;      /* Sectors per track */
49		__be16 obs3;       /* bhead - Label head offset */
50		__be16 obs4;       /* ppart - Physical Partition */
51		struct sun_partition {
52			__be32 start_cylinder;
53			__be32 num_sectors;
54		} partitions[8];
55		__be16 magic;      /* Magic number */
56		__be16 csum;       /* Label xor'd checksum */
57	} * label;
58	struct sun_partition *p;
59	unsigned long spc;
60	char b[BDEVNAME_SIZE];
61	int use_vtoc;
62	int nparts;
63
64	label = read_part_sector(state, 0, &sect);
65	if (!label)
66		return -1;
67
68	p = label->partitions;
69	if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
70/*		printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
71		       bdevname(bdev, b), be16_to_cpu(label->magic)); */
72		put_dev_sector(sect);
73		return 0;
74	}
75	/* Look at the checksum */
76	ush = ((__be16 *) (label+1)) - 1;
77	for (csum = 0; ush >= ((__be16 *) label);)
78		csum ^= *ush--;
79	if (csum) {
80		printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
81		       bdevname(state->bdev, b));
82		put_dev_sector(sect);
83		return 0;
84	}
85
86	/* Check to see if we can use the VTOC table */
87	use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
88		    (be32_to_cpu(label->vtoc.version) == 1) &&
89		    (be16_to_cpu(label->vtoc.nparts) <= 8));
90
91	/* Use 8 partition entries if not specified in validated VTOC */
92	nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
93
94	/*
95	 * So that old Linux-Sun partitions continue to work,
96	 * alow the VTOC to be used under the additional condition ...
97	 */
98	use_vtoc = use_vtoc || !(label->vtoc.sanity ||
99				 label->vtoc.version || label->vtoc.nparts);
100	spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
101	for (i = 0; i < nparts; i++, p++) {
102		unsigned long st_sector;
103		unsigned int num_sectors;
104
105		st_sector = be32_to_cpu(p->start_cylinder) * spc;
106		num_sectors = be32_to_cpu(p->num_sectors);
107		if (num_sectors) {
108			put_partition(state, slot, st_sector, num_sectors);
109			state->parts[slot].flags = 0;
110			if (use_vtoc) {
111				if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
112					state->parts[slot].flags |= ADDPART_FLAG_RAID;
113				else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
114					state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
115			}
116		}
117		slot++;
118	}
119	strlcat(state->pp_buf, "\n", PAGE_SIZE);
120	put_dev_sector(sect);
121	return 1;
122}
123