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1da177e4 LT |
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 | * 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 | */ | |
31 | static inline int | |
32 | cchh2blk (cchh_t *ptr, struct hd_geometry *geo) { | |
33 | 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 | */ | |
42 | static inline int | |
43 | cchhb2blk (cchhb_t *ptr, struct hd_geometry *geo) { | |
44 | return ptr->cc * geo->heads * geo->sectors + | |
45 | ptr->hh * geo->sectors + | |
46 | ptr->b; | |
47 | } | |
48 | ||
49 | /* | |
50 | */ | |
51 | int | |
52 | ibm_partition(struct parsed_partitions *state, struct block_device *bdev) | |
53 | { | |
54 | int blocksize, offset, size; | |
55 | dasd_information_t *info; | |
56 | struct hd_geometry *geo; | |
57 | char type[5] = {0,}; | |
58 | char name[7] = {0,}; | |
59 | volume_label_t *vlabel; | |
60 | unsigned char *data; | |
61 | Sector sect; | |
62 | ||
63 | if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL) | |
64 | goto out_noinfo; | |
65 | if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL) | |
66 | goto out_nogeo; | |
67 | if ((vlabel = kmalloc(sizeof(volume_label_t), GFP_KERNEL)) == NULL) | |
68 | goto out_novlab; | |
69 | ||
70 | if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 || | |
71 | ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0) | |
72 | goto out_noioctl; | |
73 | ||
74 | if ((blocksize = bdev_hardsect_size(bdev)) <= 0) | |
75 | goto out_badsect; | |
76 | ||
77 | /* | |
78 | * Get volume label, extract name and type. | |
79 | */ | |
80 | data = read_dev_sector(bdev, info->label_block*(blocksize/512), §); | |
81 | if (data == NULL) | |
82 | goto out_readerr; | |
83 | ||
84 | strncpy (type, data, 4); | |
85 | if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) | |
86 | strncpy(name, data + 8, 6); | |
87 | else | |
88 | strncpy(name, data + 4, 6); | |
89 | memcpy (vlabel, data, sizeof(volume_label_t)); | |
90 | put_dev_sector(sect); | |
91 | ||
92 | EBCASC(type, 4); | |
93 | EBCASC(name, 6); | |
94 | ||
95 | /* | |
96 | * Three different types: CMS1, VOL1 and LNX1/unlabeled | |
97 | */ | |
98 | if (strncmp(type, "CMS1", 4) == 0) { | |
99 | /* | |
100 | * VM style CMS1 labeled disk | |
101 | */ | |
102 | int *label = (int *) vlabel; | |
103 | ||
104 | if (label[13] != 0) { | |
105 | printk("CMS1/%8s(MDSK):", name); | |
106 | /* disk is reserved minidisk */ | |
107 | blocksize = label[3]; | |
108 | offset = label[13]; | |
109 | size = (label[7] - 1)*(blocksize >> 9); | |
110 | } else { | |
111 | printk("CMS1/%8s:", name); | |
112 | offset = (info->label_block + 1); | |
113 | size = bdev->bd_inode->i_size >> 9; | |
114 | } | |
115 | put_partition(state, 1, offset*(blocksize >> 9), | |
116 | size-offset*(blocksize >> 9)); | |
117 | } else if ((strncmp(type, "VOL1", 4) == 0) && | |
118 | (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) { | |
119 | /* | |
120 | * New style VOL1 labeled disk | |
121 | */ | |
122 | unsigned int blk; | |
123 | int counter; | |
124 | ||
125 | printk("VOL1/%8s:", name); | |
126 | ||
127 | /* get block number and read then go through format1 labels */ | |
128 | blk = cchhb2blk(&vlabel->vtoc, geo) + 1; | |
129 | counter = 0; | |
130 | while ((data = read_dev_sector(bdev, blk*(blocksize/512), | |
131 | §)) != NULL) { | |
132 | format1_label_t f1; | |
133 | ||
134 | memcpy(&f1, data, sizeof(format1_label_t)); | |
135 | put_dev_sector(sect); | |
136 | ||
137 | /* skip FMT4 / FMT5 / FMT7 labels */ | |
138 | if (f1.DS1FMTID == _ascebc['4'] | |
139 | || f1.DS1FMTID == _ascebc['5'] | |
140 | || f1.DS1FMTID == _ascebc['7']) { | |
141 | blk++; | |
142 | continue; | |
143 | } | |
144 | ||
145 | /* only FMT1 valid at this point */ | |
146 | if (f1.DS1FMTID != _ascebc['1']) | |
147 | break; | |
148 | ||
149 | /* OK, we got valid partition data */ | |
150 | offset = cchh2blk(&f1.DS1EXT1.llimit, geo); | |
151 | size = cchh2blk(&f1.DS1EXT1.ulimit, geo) - | |
152 | offset + geo->sectors; | |
153 | if (counter >= state->limit) | |
154 | break; | |
155 | put_partition(state, counter + 1, | |
156 | offset * (blocksize >> 9), | |
157 | size * (blocksize >> 9)); | |
158 | counter++; | |
159 | blk++; | |
160 | } | |
161 | } else { | |
162 | /* | |
163 | * Old style LNX1 or unlabeled disk | |
164 | */ | |
165 | if (strncmp(type, "LNX1", 4) == 0) | |
166 | printk ("LNX1/%8s:", name); | |
167 | else | |
168 | printk("(nonl)/%8s:", name); | |
169 | offset = (info->label_block + 1); | |
170 | size = (bdev->bd_inode->i_size >> 9); | |
171 | put_partition(state, 1, offset*(blocksize >> 9), | |
172 | size-offset*(blocksize >> 9)); | |
173 | } | |
174 | ||
175 | printk("\n"); | |
176 | kfree(vlabel); | |
177 | kfree(geo); | |
178 | kfree(info); | |
179 | return 1; | |
180 | ||
181 | out_readerr: | |
182 | out_badsect: | |
183 | out_noioctl: | |
184 | kfree(vlabel); | |
185 | out_novlab: | |
186 | kfree(geo); | |
187 | out_nogeo: | |
188 | kfree(info); | |
189 | out_noinfo: | |
190 | return 0; | |
191 | } |