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
|
/*
* 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
* History of changes (starts July 2000)
* 07/10/00 Fixed detection of CMS formatted disks
* 02/13/00 VTOC partition support added
* 12/27/01 fixed PL030593 (CMS reserved minidisk not detected on 64 bit)
* 07/24/03 no longer using contents of freed page for CMS label recognition (BZ3611)
*/
#include <linux/config.h>
#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 inline int
cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
return ptr->cc * geo->heads * geo->sectors +
ptr->hh * geo->sectors;
}
/*
* compute the block number from a
* cyl-cyl-head-head-block structure
*/
static inline int
cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
return ptr->cc * geo->heads * geo->sectors +
ptr->hh * geo->sectors +
ptr->b;
}
/*
*/
int
ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
{
int blocksize, offset, size;
dasd_information_t *info;
struct hd_geometry *geo;
char type[5] = {0,};
char name[7] = {0,};
struct vtoc_volume_label *vlabel;
unsigned char *data;
Sector sect;
if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
goto out_noinfo;
if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
goto out_nogeo;
if ((vlabel = kmalloc(sizeof(struct vtoc_volume_label),
GFP_KERNEL)) == NULL)
goto out_novlab;
if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
goto out_noioctl;
if ((blocksize = bdev_hardsect_size(bdev)) <= 0)
goto out_badsect;
/*
* Get volume label, extract name and type.
*/
data = read_dev_sector(bdev, info->label_block*(blocksize/512), §);
if (data == NULL)
goto out_readerr;
strncpy (type, data, 4);
if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
strncpy(name, data + 8, 6);
else
strncpy(name, data + 4, 6);
memcpy (vlabel, data, sizeof(struct vtoc_volume_label));
put_dev_sector(sect);
EBCASC(type, 4);
EBCASC(name, 6);
/*
* Three different types: CMS1, VOL1 and LNX1/unlabeled
*/
if (strncmp(type, "CMS1", 4) == 0) {
/*
* VM style CMS1 labeled disk
*/
int *label = (int *) vlabel;
if (label[13] != 0) {
printk("CMS1/%8s(MDSK):", name);
/* disk is reserved minidisk */
blocksize = label[3];
offset = label[13];
size = (label[7] - 1)*(blocksize >> 9);
} else {
printk("CMS1/%8s:", name);
offset = (info->label_block + 1);
size = bdev->bd_inode->i_size >> 9;
}
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
} else if ((strncmp(type, "VOL1", 4) == 0) &&
(!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
/*
* New style VOL1 labeled disk
*/
unsigned int blk;
int counter;
printk("VOL1/%8s:", name);
/* get block number and read then go through format1 labels */
blk = cchhb2blk(&vlabel->vtoc, geo) + 1;
counter = 0;
while ((data = read_dev_sector(bdev, blk*(blocksize/512),
§)) != 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']) {
blk++;
continue;
}
/* only FMT1 valid at this point */
if (f1.DS1FMTID != _ascebc['1'])
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++;
}
} else {
/*
* Old style LNX1 or unlabeled disk
*/
if (strncmp(type, "LNX1", 4) == 0)
printk ("LNX1/%8s:", name);
else
printk("(nonl)/%8s:", name);
offset = (info->label_block + 1);
size = (bdev->bd_inode->i_size >> 9);
put_partition(state, 1, offset*(blocksize >> 9),
size-offset*(blocksize >> 9));
}
printk("\n");
kfree(vlabel);
kfree(geo);
kfree(info);
return 1;
out_readerr:
out_badsect:
out_noioctl:
kfree(vlabel);
out_novlab:
kfree(geo);
out_nogeo:
kfree(info);
out_noinfo:
return 0;
}
|
