BUG_ON() Conversion in mm/mmap.c
[linux-2.6] / 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/config.h>
10 #include <linux/buffer_head.h>
11 #include <linux/hdreg.h>
12 #include <linux/slab.h>
13 #include <asm/dasd.h>
14 #include <asm/ebcdic.h>
15 #include <asm/uaccess.h>
16 #include <asm/vtoc.h>
17
18 #include "check.h"
19 #include "ibm.h"
20
21 /*
22  * compute the block number from a
23  * cyl-cyl-head-head structure
24  */
25 static inline int
26 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
27         return ptr->cc * geo->heads * geo->sectors +
28                ptr->hh * geo->sectors;
29 }
30
31 /*
32  * compute the block number from a
33  * cyl-cyl-head-head-block structure
34  */
35 static inline int
36 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
37         return ptr->cc * geo->heads * geo->sectors +
38                 ptr->hh * geo->sectors +
39                 ptr->b;
40 }
41
42 /*
43  */
44 int
45 ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
46 {
47         int blocksize, offset, size;
48         loff_t i_size;
49         dasd_information_t *info;
50         struct hd_geometry *geo;
51         char type[5] = {0,};
52         char name[7] = {0,};
53         union label_t {
54                 struct vtoc_volume_label vol;
55                 struct vtoc_cms_label cms;
56         } *label;
57         unsigned char *data;
58         Sector sect;
59
60         blocksize = bdev_hardsect_size(bdev);
61         if (blocksize <= 0)
62                 return 0;
63         i_size = i_size_read(bdev->bd_inode);
64         if (i_size == 0)
65                 return 0;
66
67         if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
68                 goto out_noinfo;
69         if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
70                 goto out_nogeo;
71         if ((label = kmalloc(sizeof(union label_t), GFP_KERNEL)) == NULL)
72                 goto out_nolab;
73
74         if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
75             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
76                 goto out_noioctl;
77
78         /*
79          * Get volume label, extract name and type.
80          */
81         data = read_dev_sector(bdev, info->label_block*(blocksize/512), &sect);
82         if (data == NULL)
83                 goto out_readerr;
84
85         strncpy (type, data, 4);
86         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
87                 strncpy(name, data + 8, 6);
88         else
89                 strncpy(name, data + 4, 6);
90         memcpy(label, data, sizeof(union label_t));
91         put_dev_sector(sect);
92
93         EBCASC(type, 4);
94         EBCASC(name, 6);
95
96         /*
97          * Three different types: CMS1, VOL1 and LNX1/unlabeled
98          */
99         if (strncmp(type, "CMS1", 4) == 0) {
100                 /*
101                  * VM style CMS1 labeled disk
102                  */
103                 if (label->cms.disk_offset != 0) {
104                         printk("CMS1/%8s(MDSK):", name);
105                         /* disk is reserved minidisk */
106                         blocksize = label->cms.block_size;
107                         offset = label->cms.disk_offset;
108                         size = (label->cms.block_count - 1) * (blocksize >> 9);
109                 } else {
110                         printk("CMS1/%8s:", name);
111                         offset = (info->label_block + 1);
112                         size = i_size >> 9;
113                 }
114                 put_partition(state, 1, offset*(blocksize >> 9),
115                                  size-offset*(blocksize >> 9));
116         } else if ((strncmp(type, "VOL1", 4) == 0) &&
117                 (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
118                 /*
119                  * New style VOL1 labeled disk
120                  */
121                 unsigned int blk;
122                 int counter;
123
124                 printk("VOL1/%8s:", name);
125
126                 /* get block number and read then go through format1 labels */
127                 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
128                 counter = 0;
129                 while ((data = read_dev_sector(bdev, blk*(blocksize/512),
130                                                &sect)) != NULL) {
131                         struct vtoc_format1_label f1;
132
133                         memcpy(&f1, data, sizeof(struct vtoc_format1_label));
134                         put_dev_sector(sect);
135
136                         /* skip FMT4 / FMT5 / FMT7 labels */
137                         if (f1.DS1FMTID == _ascebc['4']
138                             || f1.DS1FMTID == _ascebc['5']
139                             || f1.DS1FMTID == _ascebc['7']) {
140                                 blk++;
141                                 continue;
142                         }
143
144                         /* only FMT1 valid at this point */
145                         if (f1.DS1FMTID != _ascebc['1'])
146                                 break;
147
148                         /* OK, we got valid partition data */
149                         offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
150                         size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
151                                 offset + geo->sectors;
152                         if (counter >= state->limit)
153                                 break;
154                         put_partition(state, counter + 1,
155                                       offset * (blocksize >> 9),
156                                       size * (blocksize >> 9));
157                         counter++;
158                         blk++;
159                 }
160         } else {
161                 /*
162                  * Old style LNX1 or unlabeled disk
163                  */
164                 if (strncmp(type, "LNX1", 4) == 0)
165                         printk ("LNX1/%8s:", name);
166                 else
167                         printk("(nonl)/%8s:", name);
168                 offset = (info->label_block + 1);
169                 size = i_size >> 9;
170                 put_partition(state, 1, offset*(blocksize >> 9),
171                               size-offset*(blocksize >> 9));
172         }
173
174         printk("\n");
175         kfree(label);
176         kfree(geo);
177         kfree(info);
178         return 1;
179
180 out_readerr:
181 out_noioctl:
182         kfree(label);
183 out_nolab:
184         kfree(geo);
185 out_nogeo:
186         kfree(info);
187 out_noinfo:
188         return 0;
189 }