3e73de5967ff94c9e5896aaf84cd0c6a1c7a4b96
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / partitions / ibm.c
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 sector_t
25 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
26
27 sector_t cyl;
28 __u16 head;
29
30 /*decode cylinder and heads for large volumes */
31 cyl = ptr->hh & 0xFFF0;
32 cyl <<= 12;
33 cyl |= ptr->cc;
34 head = ptr->hh & 0x000F;
35 return cyl * geo->heads * geo->sectors +
36 head * geo->sectors;
37 }
38
39 /*
40 * compute the block number from a
41 * cyl-cyl-head-head-block structure
42 */
43 static sector_t
44 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
45
46 sector_t cyl;
47 __u16 head;
48
49 /*decode cylinder and heads for large volumes */
50 cyl = ptr->hh & 0xFFF0;
51 cyl <<= 12;
52 cyl |= ptr->cc;
53 head = ptr->hh & 0x000F;
54 return cyl * geo->heads * geo->sectors +
55 head * geo->sectors +
56 ptr->b;
57 }
58
59 /*
60 */
61 int ibm_partition(struct parsed_partitions *state)
62 {
63 struct block_device *bdev = state->bdev;
64 int blocksize, res;
65 loff_t i_size, offset, size, fmt_size;
66 dasd_information2_t *info;
67 struct hd_geometry *geo;
68 char type[5] = {0,};
69 char name[7] = {0,};
70 union label_t {
71 struct vtoc_volume_label_cdl vol;
72 struct vtoc_volume_label_ldl lnx;
73 struct vtoc_cms_label cms;
74 } *label;
75 unsigned char *data;
76 Sector sect;
77
78 res = 0;
79 blocksize = bdev_logical_block_size(bdev);
80 if (blocksize <= 0)
81 goto out_exit;
82 i_size = i_size_read(bdev->bd_inode);
83 if (i_size == 0)
84 goto out_exit;
85
86 info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
87 if (info == NULL)
88 goto out_exit;
89 geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
90 if (geo == NULL)
91 goto out_nogeo;
92 label = kmalloc(sizeof(union label_t), GFP_KERNEL);
93 if (label == NULL)
94 goto out_nolab;
95
96 if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
97 ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
98 goto out_freeall;
99
100 /*
101 * Get volume label, extract name and type.
102 */
103 data = read_part_sector(state, info->label_block*(blocksize/512),
104 &sect);
105 if (data == NULL)
106 goto out_readerr;
107
108 memcpy(label, data, sizeof(union label_t));
109 put_dev_sector(sect);
110
111 if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
112 strncpy(type, label->vol.vollbl, 4);
113 strncpy(name, label->vol.volid, 6);
114 } else {
115 strncpy(type, label->lnx.vollbl, 4);
116 strncpy(name, label->lnx.volid, 6);
117 }
118 EBCASC(type, 4);
119 EBCASC(name, 6);
120
121 res = 1;
122
123 /*
124 * Three different formats: LDL, CDL and unformated disk
125 *
126 * identified by info->format
127 *
128 * unformated disks we do not have to care about
129 */
130 if (info->format == DASD_FORMAT_LDL) {
131 if (strncmp(type, "CMS1", 4) == 0) {
132 /*
133 * VM style CMS1 labeled disk
134 */
135 blocksize = label->cms.block_size;
136 if (label->cms.disk_offset != 0) {
137 printk("CMS1/%8s(MDSK):", name);
138 /* disk is reserved minidisk */
139 offset = label->cms.disk_offset;
140 size = (label->cms.block_count - 1)
141 * (blocksize >> 9);
142 } else {
143 printk("CMS1/%8s:", name);
144 offset = (info->label_block + 1);
145 size = label->cms.block_count
146 * (blocksize >> 9);
147 }
148 put_partition(state, 1, offset*(blocksize >> 9),
149 size-offset*(blocksize >> 9));
150 } else {
151 if (strncmp(type, "LNX1", 4) == 0) {
152 printk("LNX1/%8s:", name);
153 if (label->lnx.ldl_version == 0xf2) {
154 fmt_size = label->lnx.formatted_blocks
155 * (blocksize >> 9);
156 } else if (!strcmp(info->type, "ECKD")) {
157 /* formated w/o large volume support */
158 fmt_size = geo->cylinders * geo->heads
159 * geo->sectors * (blocksize >> 9);
160 } else {
161 /* old label and no usable disk geometry
162 * (e.g. DIAG) */
163 fmt_size = i_size >> 9;
164 }
165 size = i_size >> 9;
166 if (fmt_size < size)
167 size = fmt_size;
168 offset = (info->label_block + 1);
169 } else {
170 /* unlabeled disk */
171 printk("(nonl)");
172 size = i_size >> 9;
173 offset = (info->label_block + 1);
174 }
175 put_partition(state, 1, offset*(blocksize >> 9),
176 size-offset*(blocksize >> 9));
177 }
178 } else if (info->format == DASD_FORMAT_CDL) {
179 /*
180 * New style CDL formatted disk
181 */
182 sector_t blk;
183 int counter;
184
185 /*
186 * check if VOL1 label is available
187 * if not, something is wrong, skipping partition detection
188 */
189 if (strncmp(type, "VOL1", 4) == 0) {
190 printk("VOL1/%8s:", name);
191 /*
192 * get block number and read then go through format1
193 * labels
194 */
195 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
196 counter = 0;
197 data = read_part_sector(state, blk * (blocksize/512),
198 &sect);
199 while (data != NULL) {
200 struct vtoc_format1_label f1;
201
202 memcpy(&f1, data,
203 sizeof(struct vtoc_format1_label));
204 put_dev_sector(sect);
205
206 /* skip FMT4 / FMT5 / FMT7 labels */
207 if (f1.DS1FMTID == _ascebc['4']
208 || f1.DS1FMTID == _ascebc['5']
209 || f1.DS1FMTID == _ascebc['7']
210 || f1.DS1FMTID == _ascebc['9']) {
211 blk++;
212 data = read_part_sector(state,
213 blk * (blocksize/512), &sect);
214 continue;
215 }
216
217 /* only FMT1 and 8 labels valid at this point */
218 if (f1.DS1FMTID != _ascebc['1'] &&
219 f1.DS1FMTID != _ascebc['8'])
220 break;
221
222 /* OK, we got valid partition data */
223 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
224 size = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
225 offset + geo->sectors;
226 if (counter >= state->limit)
227 break;
228 put_partition(state, counter + 1,
229 offset * (blocksize >> 9),
230 size * (blocksize >> 9));
231 counter++;
232 blk++;
233 data = read_part_sector(state,
234 blk * (blocksize/512), &sect);
235 }
236
237 if (!data)
238 /* Are we not supposed to report this ? */
239 goto out_readerr;
240 } else
241 printk(KERN_WARNING "Warning, expected Label VOL1 not "
242 "found, treating as CDL formated Disk");
243
244 }
245
246 printk("\n");
247 goto out_freeall;
248
249
250 out_readerr:
251 res = -1;
252 out_freeall:
253 kfree(label);
254 out_nolab:
255 kfree(geo);
256 out_nogeo:
257 kfree(info);
258 out_exit:
259 return res;
260 }