Merge branch 'upstream'
[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  * 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 (struct vtoc_cchh *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 (struct vtoc_cchhb *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         struct vtoc_volume_label *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(struct vtoc_volume_label),
68                               GFP_KERNEL)) == NULL)
69                 goto out_novlab;
70         
71         if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
72             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
73                 goto out_noioctl;
74         
75         if ((blocksize = bdev_hardsect_size(bdev)) <= 0)
76                 goto out_badsect;
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 (vlabel, data, sizeof(struct vtoc_volume_label));
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                 int *label = (int *) vlabel;
104
105                 if (label[13] != 0) {
106                         printk("CMS1/%8s(MDSK):", name);
107                         /* disk is reserved minidisk */
108                         blocksize = label[3];
109                         offset = label[13];
110                         size = (label[7] - 1)*(blocksize >> 9);
111                 } else {
112                         printk("CMS1/%8s:", name);
113                         offset = (info->label_block + 1);
114                         size = bdev->bd_inode->i_size >> 9;
115                 }
116                 put_partition(state, 1, offset*(blocksize >> 9),
117                                  size-offset*(blocksize >> 9));
118         } else if ((strncmp(type, "VOL1", 4) == 0) &&
119                 (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
120                 /*
121                  * New style VOL1 labeled disk
122                  */
123                 unsigned int blk;
124                 int counter;
125
126                 printk("VOL1/%8s:", name);
127
128                 /* get block number and read then go through format1 labels */
129                 blk = cchhb2blk(&vlabel->vtoc, geo) + 1;
130                 counter = 0;
131                 while ((data = read_dev_sector(bdev, blk*(blocksize/512),
132                                                &sect)) != NULL) {
133                         struct vtoc_format1_label f1;
134
135                         memcpy(&f1, data, sizeof(struct vtoc_format1_label));
136                         put_dev_sector(sect);
137
138                         /* skip FMT4 / FMT5 / FMT7 labels */
139                         if (f1.DS1FMTID == _ascebc['4']
140                             || f1.DS1FMTID == _ascebc['5']
141                             || f1.DS1FMTID == _ascebc['7']) {
142                                 blk++;
143                                 continue;
144                         }
145
146                         /* only FMT1 valid at this point */
147                         if (f1.DS1FMTID != _ascebc['1'])
148                                 break;
149
150                         /* OK, we got valid partition data */
151                         offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
152                         size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) - 
153                                 offset + geo->sectors;
154                         if (counter >= state->limit)
155                                 break;
156                         put_partition(state, counter + 1, 
157                                          offset * (blocksize >> 9),
158                                          size * (blocksize >> 9));
159                         counter++;
160                         blk++;
161                 }
162         } else {
163                 /*
164                  * Old style LNX1 or unlabeled disk
165                  */
166                 if (strncmp(type, "LNX1", 4) == 0)
167                         printk ("LNX1/%8s:", name);
168                 else
169                         printk("(nonl)/%8s:", name);
170                 offset = (info->label_block + 1);
171                 size = (bdev->bd_inode->i_size >> 9);
172                 put_partition(state, 1, offset*(blocksize >> 9),
173                                  size-offset*(blocksize >> 9));
174         }
175
176         printk("\n");
177         kfree(vlabel);
178         kfree(geo);
179         kfree(info);
180         return 1;
181         
182 out_readerr:
183 out_badsect:
184 out_noioctl:
185         kfree(vlabel);
186 out_novlab:
187         kfree(geo);
188 out_nogeo:
189         kfree(info);
190 out_noinfo:
191         return 0;
192 }