1 /*
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
9 #include <linux/buffer_head.h>
10 #include <linux/hdreg.h>
11 #include <linux/slab.h>
12 #include <asm/dasd.h>
13 #include <asm/ebcdic.h>
14 #include <asm/uaccess.h>
15 #include <asm/vtoc.h>
16
17 #include "check.h"
18 #include "ibm.h"
19
20 /*
21 * compute the block number from a
22 * cyl-cyl-head-head structure
23 */
24 static inline int
cchh2blk(struct vtoc_cchh * ptr,struct hd_geometry * geo)25 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
26 return ptr->cc * geo->heads * geo->sectors +
27 ptr->hh * geo->sectors;
28 }
29
30 /*
31 * compute the block number from a
32 * cyl-cyl-head-head-block structure
33 */
34 static inline int
cchhb2blk(struct vtoc_cchhb * ptr,struct hd_geometry * geo)35 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
36 return ptr->cc * geo->heads * geo->sectors +
37 ptr->hh * geo->sectors +
38 ptr->b;
39 }
40
41 /*
42 */
43 int
ibm_partition(struct parsed_partitions * state,struct block_device * bdev)44 ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
45 {
46 int blocksize, offset, size,res;
47 loff_t i_size;
48 dasd_information2_t *info;
49 struct hd_geometry *geo;
50 char type[5] = {0,};
51 char name[7] = {0,};
52 union label_t {
53 struct vtoc_volume_label vol;
54 struct vtoc_cms_label cms;
55 } *label;
56 unsigned char *data;
57 Sector sect;
58
59 res = 0;
60 blocksize = bdev_hardsect_size(bdev);
61 if (blocksize <= 0)
62 goto out_exit;
63 i_size = i_size_read(bdev->bd_inode);
64 if (i_size == 0)
65 goto out_exit;
66
67 info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
68 if (info == NULL)
69 goto out_exit;
70 geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
71 if (geo == NULL)
72 goto out_nogeo;
73 label = kmalloc(sizeof(union label_t), GFP_KERNEL);
74 if (label == NULL)
75 goto out_nolab;
76
77 if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
78 ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
79 goto out_freeall;
80
81 /*
82 * Get volume label, extract name and type.
83 */
84 data = read_dev_sector(bdev, info->label_block*(blocksize/512), §);
85 if (data == NULL)
86 goto out_readerr;
87
88 strncpy (type, data, 4);
89 if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
90 strncpy(name, data + 8, 6);
91 else
92 strncpy(name, data + 4, 6);
93 memcpy(label, data, sizeof(union label_t));
94 put_dev_sector(sect);
95
96 EBCASC(type, 4);
97 EBCASC(name, 6);
98
99 res = 1;
100
101 /*
102 * Three different formats: LDL, CDL and unformated disk
103 *
104 * identified by info->format
105 *
106 * unformated disks we do not have to care about
107 */
108 if (info->format == DASD_FORMAT_LDL) {
109 if (strncmp(type, "CMS1", 4) == 0) {
110 /*
111 * VM style CMS1 labeled disk
112 */
113 if (label->cms.disk_offset != 0) {
114 printk("CMS1/%8s(MDSK):", name);
115 /* disk is reserved minidisk */
116 blocksize = label->cms.block_size;
117 offset = label->cms.disk_offset;
118 size = (label->cms.block_count - 1)
119 * (blocksize >> 9);
120 } else {
121 printk("CMS1/%8s:", name);
122 offset = (info->label_block + 1);
123 size = i_size >> 9;
124 }
125 } else {
126 /*
127 * Old style LNX1 or unlabeled disk
128 */
129 if (strncmp(type, "LNX1", 4) == 0)
130 printk ("LNX1/%8s:", name);
131 else
132 printk("(nonl)");
133 offset = (info->label_block + 1);
134 size = i_size >> 9;
135 }
136 put_partition(state, 1, offset*(blocksize >> 9),
137 size-offset*(blocksize >> 9));
138 } else if (info->format == DASD_FORMAT_CDL) {
139 /*
140 * New style CDL formatted disk
141 */
142 unsigned int blk;
143 int counter;
144
145 /*
146 * check if VOL1 label is available
147 * if not, something is wrong, skipping partition detection
148 */
149 if (strncmp(type, "VOL1", 4) == 0) {
150 printk("VOL1/%8s:", name);
151 /*
152 * get block number and read then go through format1
153 * labels
154 */
155 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
156 counter = 0;
157 data = read_dev_sector(bdev, blk * (blocksize/512),
158 §);
159 while (data != NULL) {
160 struct vtoc_format1_label f1;
161
162 memcpy(&f1, data,
163 sizeof(struct vtoc_format1_label));
164 put_dev_sector(sect);
165
166 /* skip FMT4 / FMT5 / FMT7 labels */
167 if (f1.DS1FMTID == _ascebc['4']
168 || f1.DS1FMTID == _ascebc['5']
169 || f1.DS1FMTID == _ascebc['7']) {
170 blk++;
171 data = read_dev_sector(bdev, blk *
172 (blocksize/512),
173 §);
174 continue;
175 }
176
177 /* only FMT1 valid at this point */
178 if (f1.DS1FMTID != _ascebc['1'])
179 break;
180
181 /* OK, we got valid partition data */
182 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
183 size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
184 offset + geo->sectors;
185 if (counter >= state->limit)
186 break;
187 put_partition(state, counter + 1,
188 offset * (blocksize >> 9),
189 size * (blocksize >> 9));
190 counter++;
191 blk++;
192 data = read_dev_sector(bdev,
193 blk * (blocksize/512),
194 §);
195 }
196
197 if (!data)
198 /* Are we not supposed to report this ? */
199 goto out_readerr;
200 } else
201 printk(KERN_WARNING "Warning, expected Label VOL1 not "
202 "found, treating as CDL formated Disk");
203
204 }
205
206 printk("\n");
207 goto out_freeall;
208
209
210 out_readerr:
211 res = -1;
212 out_freeall:
213 kfree(label);
214 out_nolab:
215 kfree(geo);
216 out_nogeo:
217 kfree(info);
218 out_exit:
219 return res;
220 }
221