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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 | |
4cd5b9f6 | 32 | cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) { |
1da177e4 LT |
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 | |
4cd5b9f6 | 43 | cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) { |
1da177e4 LT |
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; | |
90f0094d | 55 | loff_t i_size; |
1da177e4 LT |
56 | dasd_information_t *info; |
57 | struct hd_geometry *geo; | |
58 | char type[5] = {0,}; | |
59 | char name[7] = {0,}; | |
56dc6a88 PO |
60 | union label_t { |
61 | struct vtoc_volume_label vol; | |
62 | struct vtoc_cms_label cms; | |
63 | } *label; | |
1da177e4 LT |
64 | unsigned char *data; |
65 | Sector sect; | |
66 | ||
90f0094d HH |
67 | 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 | ||
1da177e4 LT |
74 | 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; | |
56dc6a88 PO |
78 | if ((label = kmalloc(sizeof(union label_t), GFP_KERNEL)) == NULL) |
79 | goto out_nolab; | |
1da177e4 LT |
80 | |
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; | |
1da177e4 LT |
84 | |
85 | /* | |
86 | * Get volume label, extract name and type. | |
87 | */ | |
88 | data = read_dev_sector(bdev, info->label_block*(blocksize/512), §); | |
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); | |
56dc6a88 | 97 | memcpy(label, data, sizeof(union label_t)); |
1da177e4 LT |
98 | 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 | */ | |
56dc6a88 | 110 | if (label->cms.disk_offset != 0) { |
1da177e4 LT |
111 | printk("CMS1/%8s(MDSK):", name); |
112 | /* disk is reserved minidisk */ | |
56dc6a88 PO |
113 | blocksize = label->cms.block_size; |
114 | offset = label->cms.disk_offset; | |
115 | size = (label->cms.block_count - 1) * (blocksize >> 9); | |
1da177e4 LT |
116 | } else { |
117 | printk("CMS1/%8s:", name); | |
118 | offset = (info->label_block + 1); | |
90f0094d | 119 | size = i_size >> 9; |
1da177e4 LT |
120 | } |
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 */ | |
56dc6a88 | 134 | blk = cchhb2blk(&label->vol.vtoc, geo) + 1; |
1da177e4 LT |
135 | counter = 0; |
136 | while ((data = read_dev_sector(bdev, blk*(blocksize/512), | |
137 | §)) != NULL) { | |
4cd5b9f6 | 138 | struct vtoc_format1_label f1; |
1da177e4 | 139 | |
4cd5b9f6 | 140 | memcpy(&f1, data, sizeof(struct vtoc_format1_label)); |
1da177e4 LT |
141 | 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); | |
90f0094d | 176 | size = i_size >> 9; |
1da177e4 LT |
177 | put_partition(state, 1, offset*(blocksize >> 9), |
178 | size-offset*(blocksize >> 9)); | |
179 | } | |
180 | ||
181 | printk("\n"); | |
56dc6a88 | 182 | kfree(label); |
1da177e4 LT |
183 | kfree(geo); |
184 | kfree(info); | |
185 | return 1; | |
186 | ||
187 | out_readerr: | |
1da177e4 | 188 | out_noioctl: |
56dc6a88 PO |
189 | kfree(label); |
190 | out_nolab: | |
1da177e4 LT |
191 | kfree(geo); |
192 | out_nogeo: | |
193 | kfree(info); | |
194 | out_noinfo: | |
195 | return 0; | |
196 | } |