blob: 1e4a93835fed7e11b6c7eea7e7196d3cea9ed19b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * File...........: linux/fs/partitions/ibm.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Volker Sameske <sameske@de.ibm.com>
5 * Bugreports.to..: <Linux390@de.ibm.com>
6 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
7
8 * History of changes (starts July 2000)
9 * 07/10/00 Fixed detection of CMS formatted disks
10 * 02/13/00 VTOC partition support added
11 * 12/27/01 fixed PL030593 (CMS reserved minidisk not detected on 64 bit)
12 * 07/24/03 no longer using contents of freed page for CMS label recognition (BZ3611)
13 */
14
15#include <linux/config.h>
16#include <linux/buffer_head.h>
17#include <linux/hdreg.h>
18#include <linux/slab.h>
19#include <asm/dasd.h>
20#include <asm/ebcdic.h>
21#include <asm/uaccess.h>
22#include <asm/vtoc.h>
23
24#include "check.h"
25#include "ibm.h"
26
27/*
28 * compute the block number from a
29 * cyl-cyl-head-head structure
30 */
31static inline int
Peter Oberparleiter4cd5b9f2005-11-07 00:59:09 -080032cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 return ptr->cc * geo->heads * geo->sectors +
34 ptr->hh * geo->sectors;
35}
36
37
38/*
39 * compute the block number from a
40 * cyl-cyl-head-head-block structure
41 */
42static inline int
Peter Oberparleiter4cd5b9f2005-11-07 00:59:09 -080043cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 return ptr->cc * geo->heads * geo->sectors +
45 ptr->hh * geo->sectors +
46 ptr->b;
47}
48
49/*
50 */
51int
52ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
53{
54 int blocksize, offset, size;
Horst Hummel90f00942006-03-07 21:55:39 -080055 loff_t i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 dasd_information_t *info;
57 struct hd_geometry *geo;
58 char type[5] = {0,};
59 char name[7] = {0,};
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -080060 union label_t {
61 struct vtoc_volume_label vol;
62 struct vtoc_cms_label cms;
63 } *label;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 unsigned char *data;
65 Sector sect;
66
Horst Hummel90f00942006-03-07 21:55:39 -080067 blocksize = bdev_hardsect_size(bdev);
68 if (blocksize <= 0)
69 return 0;
70 i_size = i_size_read(bdev->bd_inode);
71 if (i_size == 0)
72 return 0;
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
75 goto out_noinfo;
76 if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
77 goto out_nogeo;
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -080078 if ((label = kmalloc(sizeof(union label_t), GFP_KERNEL)) == NULL)
79 goto out_nolab;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81 if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
82 ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
83 goto out_noioctl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
85 /*
86 * Get volume label, extract name and type.
87 */
88 data = read_dev_sector(bdev, info->label_block*(blocksize/512), &sect);
89 if (data == NULL)
90 goto out_readerr;
91
92 strncpy (type, data, 4);
93 if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
94 strncpy(name, data + 8, 6);
95 else
96 strncpy(name, data + 4, 6);
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -080097 memcpy(label, data, sizeof(union label_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 put_dev_sector(sect);
99
100 EBCASC(type, 4);
101 EBCASC(name, 6);
102
103 /*
104 * Three different types: CMS1, VOL1 and LNX1/unlabeled
105 */
106 if (strncmp(type, "CMS1", 4) == 0) {
107 /*
108 * VM style CMS1 labeled disk
109 */
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -0800110 if (label->cms.disk_offset != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 printk("CMS1/%8s(MDSK):", name);
112 /* disk is reserved minidisk */
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -0800113 blocksize = label->cms.block_size;
114 offset = label->cms.disk_offset;
115 size = (label->cms.block_count - 1) * (blocksize >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 } else {
117 printk("CMS1/%8s:", name);
118 offset = (info->label_block + 1);
Horst Hummel90f00942006-03-07 21:55:39 -0800119 size = i_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 }
121 put_partition(state, 1, offset*(blocksize >> 9),
122 size-offset*(blocksize >> 9));
123 } else if ((strncmp(type, "VOL1", 4) == 0) &&
124 (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
125 /*
126 * New style VOL1 labeled disk
127 */
128 unsigned int blk;
129 int counter;
130
131 printk("VOL1/%8s:", name);
132
133 /* get block number and read then go through format1 labels */
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -0800134 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 counter = 0;
136 while ((data = read_dev_sector(bdev, blk*(blocksize/512),
137 &sect)) != NULL) {
Peter Oberparleiter4cd5b9f2005-11-07 00:59:09 -0800138 struct vtoc_format1_label f1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Peter Oberparleiter4cd5b9f2005-11-07 00:59:09 -0800140 memcpy(&f1, data, sizeof(struct vtoc_format1_label));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 put_dev_sector(sect);
142
143 /* skip FMT4 / FMT5 / FMT7 labels */
144 if (f1.DS1FMTID == _ascebc['4']
145 || f1.DS1FMTID == _ascebc['5']
146 || f1.DS1FMTID == _ascebc['7']) {
147 blk++;
148 continue;
149 }
150
151 /* only FMT1 valid at this point */
152 if (f1.DS1FMTID != _ascebc['1'])
153 break;
154
155 /* OK, we got valid partition data */
156 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
157 size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
158 offset + geo->sectors;
159 if (counter >= state->limit)
160 break;
161 put_partition(state, counter + 1,
162 offset * (blocksize >> 9),
163 size * (blocksize >> 9));
164 counter++;
165 blk++;
166 }
167 } else {
168 /*
169 * Old style LNX1 or unlabeled disk
170 */
171 if (strncmp(type, "LNX1", 4) == 0)
172 printk ("LNX1/%8s:", name);
173 else
174 printk("(nonl)/%8s:", name);
175 offset = (info->label_block + 1);
Horst Hummel90f00942006-03-07 21:55:39 -0800176 size = i_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 put_partition(state, 1, offset*(blocksize >> 9),
178 size-offset*(blocksize >> 9));
179 }
180
181 printk("\n");
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -0800182 kfree(label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 kfree(geo);
184 kfree(info);
185 return 1;
186
187out_readerr:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188out_noioctl:
Peter Oberparleiter56dc6a82006-01-06 00:19:09 -0800189 kfree(label);
190out_nolab:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 kfree(geo);
192out_nogeo:
193 kfree(info);
194out_noinfo:
195 return 0;
196}