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 }