summaryrefslogtreecommitdiffstats
path: root/fs/partitions/ibm.c
blob: d1b8a5c4bc0aa556f1eff3183d1a49530bbc0da1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
/*
 * File...........: linux/fs/partitions/ibm.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *                  Volker Sameske <sameske@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
 */

#include <linux/buffer_head.h>
#include <linux/hdreg.h>
#include <linux/slab.h>
#include <asm/dasd.h>
#include <asm/ebcdic.h>
#include <asm/uaccess.h>
#include <asm/vtoc.h>

#include "check.h"
#include "ibm.h"

/*
 * compute the block number from a
 * cyl-cyl-head-head structure
 */
static sector_t
cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {

	sector_t cyl;
	__u16 head;

	/*decode cylinder and heads for large volumes */
	cyl = ptr->hh & 0xFFF0;
	cyl <<= 12;
	cyl |= ptr->cc;
	head = ptr->hh & 0x000F;
	return cyl * geo->heads * geo->sectors +
	       head * geo->sectors;
}

/*
 * compute the block number from a
 * cyl-cyl-head-head-block structure
 */
static sector_t
cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {

	sector_t cyl;
	__u16 head;

	/*decode cylinder and heads for large volumes */
	cyl = ptr->hh & 0xFFF0;
	cyl <<= 12;
	cyl |= ptr->cc;
	head = ptr->hh & 0x000F;
	return	cyl * geo->heads * geo->sectors +
		head * geo->sectors +
		ptr->b;
}

/*
 */
int ibm_partition(struct parsed_partitions *state)
{
	struct block_device *bdev = state->bdev;
	int blocksize, res;
	loff_t i_size, offset, size, fmt_size;
	dasd_information2_t *info;
	struct hd_geometry *geo;
	char type[5] = {0,};
	char name[7] = {0,};
	union label_t {
		struct vtoc_volume_label_cdl vol;
		struct vtoc_volume_label_ldl lnx;
		struct vtoc_cms_label cms;
	} *label;
	unsigned char *data;
	Sector sect;
	sector_t labelsect;
	char tmp[64];

	res = 0;
	blocksize = bdev_logical_block_size(bdev);
	if (blocksize <= 0)
		goto out_exit;
	i_size = i_size_read(bdev->bd_inode);
	if (i_size == 0)
		goto out_exit;

	info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
	if (info == NULL)
		goto out_exit;
	geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
	if (geo == NULL)
		goto out_nogeo;
	label = kmalloc(sizeof(union label_t), GFP_KERNEL);
	if (label == NULL)
		goto out_nolab;

	if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
	    ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
		goto out_freeall;

	/*
	 * Special case for FBA disks: label sector does not depend on
	 * blocksize.
	 */
	if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
	    (info->cu_type == 0x3880 && info->dev_type == 0x3370))
		labelsect = info->label_block;
	else
		labelsect = info->label_block * (blocksize >> 9);

	/*
	 * Get volume label, extract name and type.
	 */
	data = read_part_sector(state, labelsect, &sect);
	if (data == NULL)
		goto out_readerr;

	memcpy(label, data, sizeof(union label_t));
	put_dev_sector(sect);

	if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
		strncpy(type, label->vol.vollbl, 4);
		strncpy(name, label->vol.volid, 6);
	} else {
		strncpy(type, label->lnx.vollbl, 4);
		strncpy(name, label->lnx.volid, 6);
	}
	EBCASC(type, 4);
	EBCASC(name, 6);

	res = 1;

	/*
	 * Three different formats: LDL, CDL and unformated disk
	 *
	 * identified by info->format
	 *
	 * unformated disks we do not have to care about
	 */
	if (info->format == DASD_FORMAT_LDL) {
		if (strncmp(type, "CMS1", 4) == 0) {
			/*
			 * VM style CMS1 labeled disk
			 */
			blocksize = label->cms.block_size;
			if (label->cms.disk_offset != 0) {
				snprintf(tmp, sizeof(tmp), "CMS1/%8s(MDSK):", name);
				strlcat(state->pp_buf, tmp, PAGE_SIZE);
				/* disk is reserved minidisk */
				offset = label->cms.disk_offset;
				size = (label->cms.block_count - 1)
					* (blocksize >> 9);
			} else {
				snprintf(tmp, sizeof(tmp), "CMS1/%8s:", name);
				strlcat(state->pp_buf, tmp, PAGE_SIZE);
				offset = (info->label_block + 1);
				size = label->cms.block_count
					* (blocksize >> 9);
			}
			put_partition(state, 1, offset*(blocksize >> 9),
				      size-offset*(blocksize >> 9));
		} else {
			if (strncmp(type, "LNX1", 4) == 0) {
				snprintf(tmp, sizeof(tmp), "LNX1/%8s:", name);
				strlcat(state->pp_buf, tmp, PAGE_SIZE);
				if (label->lnx.ldl_version == 0xf2) {
					fmt_size = label->lnx.formatted_blocks
						* (blocksize >> 9);
				} else if (!strcmp(info->type, "ECKD")) {
					/* formated w/o large volume support */
					fmt_size = geo->cylinders * geo->heads
					      * geo->sectors * (blocksize >> 9);
				} else {
					/* old label and no usable disk geometry
					 * (e.g. DIAG) */
					fmt_size = i_size >> 9;
				}
				size = i_size >> 9;
				if (fmt_size < size)
					size = fmt_size;
				offset = (info->label_block + 1);
			} else {
				/* unlabeled disk */
				strlcat(tmp, sizeof(tmp), "(nonl)", PAGE_SIZE);
				size = i_size >> 9;
				offset = (info->label_block + 1);
			}
			put_partition(state, 1, offset*(blocksize >> 9),
				      size-offset*(blocksize >> 9));
		}
	} else if (info->format == DASD_FORMAT_CDL) {
		/*
		 * New style CDL formatted disk
		 */
		sector_t blk;
		int counter;

		/*
		 * check if VOL1 label is available
		 * if not, something is wrong, skipping partition detection
		 */
		if (strncmp(type, "VOL1",  4) == 0) {
			snprintf(tmp, sizeof(tmp), "VOL1/%8s:", name);
			strlcat(state->pp_buf, tmp, PAGE_SIZE);
			/*
			 * get block number and read then go through format1
			 * labels
			 */
			blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
			counter = 0;
			data = read_part_sector(state, blk * (blocksize/512),
						&sect);
			while (data != NULL) {
				struct vtoc_format1_label f1;

				memcpy(&f1, data,
				       sizeof(struct vtoc_format1_label));
				put_dev_sector(sect);

				/* skip FMT4 / FMT5 / FMT7 labels */
				if (f1.DS1FMTID == _ascebc['4']
				    || f1.DS1FMTID == _ascebc['5']
				    || f1.DS1FMTID == _ascebc['7']
				    || f1.DS1FMTID == _ascebc['9']) {
					blk++;
					data = read_part_sector(state,
						blk * (blocksize/512), &sect);
					continue;
				}

				/* only FMT1 and 8 labels valid at this point */
				if (f1.DS1FMTID != _ascebc['1'] &&
				    f1.DS1FMTID != _ascebc['8'])
					break;

				/* OK, we got valid partition data */
				offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
				size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
					offset + geo->sectors;
				if (counter >= state->limit)
					break;
				put_partition(state, counter + 1,
					      offset * (blocksize >> 9),
					      size * (blocksize >> 9));
				counter++;
				blk++;
				data = read_part_sector(state,
						blk * (blocksize/512), &sect);
			}

			if (!data)
				/* Are we not supposed to report this ? */
				goto out_readerr;
		} else
			printk(KERN_WARNING "Warning, expected Label VOL1 not "
			       "found, treating as CDL formated Disk");

	}

	strlcat(state->pp_buf, "\n", PAGE_SIZE);
	goto out_freeall;


out_readerr:
	res = -1;
out_freeall:
	kfree(label);
out_nolab:
	kfree(geo);
out_nogeo:
	kfree(info);
out_exit:
	return res;
}