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 inline int
  25 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
  26         return ptr->cc * geo->heads * geo->sectors +
  27                ptr->hh * geo->sectors;
  28 }
  29
  30 /*
  31  * compute the block number from a
  32  * cyl-cyl-head-head-block structure
  33  */
  34 static inline int
  35 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
  36         return ptr->cc * geo->heads * geo->sectors +
  37                 ptr->hh * geo->sectors +
  38                 ptr->b;
  39 }
  40
  41 /*
  42  */
  43 int
  44 ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
  45 {
  46         int blocksize, offset, size,res;
  47         loff_t i_size;
  48         dasd_information_t *info;
  49         struct hd_geometry *geo;
  50         char type[5] = {0,};
  51         char name[7] = {0,};
  52         union label_t {
  53                 struct vtoc_volume_label vol;
  54                 struct vtoc_cms_label cms;
  55         } *label;
  56         unsigned char *data;
  57         Sector sect;
  58
  59         res = 0;
  60         blocksize = bdev_hardsect_size(bdev);
  61         if (blocksize <= 0)
  62                 goto out_exit;
  63         i_size = i_size_read(bdev->bd_inode);
  64         if (i_size == 0)
  65                 goto out_exit;
  66
  67         if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
  68                 goto out_exit;
  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_freeall;
  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         res = 1;
  97
  98         /*
  99          * Three different types: CMS1, VOL1 and LNX1/unlabeled
 100          */
 101         if (strncmp(type, "CMS1", 4) == 0) {
 102                 /*
 103                  * VM style CMS1 labeled disk
 104                  */
 105                 if (label->cms.disk_offset != 0) {
 106                         printk("CMS1/%8s(MDSK):", name);
 107                         /* disk is reserved minidisk */
 108                         blocksize = label->cms.block_size;
 109                         offset = label->cms.disk_offset;
 110                         size = (label->cms.block_count - 1) * (blocksize >> 9);
 111                 } else {
 112                         printk("CMS1/%8s:", name);
 113                         offset = (info->label_block + 1);
 114                         size = 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(&label->vol.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                 if (!data)
 163                 /* Are we not supposed to report this ? */
 164                         goto out_readerr;
 165         } else {
 166                 /*
 167                  * Old style LNX1 or unlabeled disk
 168                  */
 169                 if (strncmp(type, "LNX1", 4) == 0)
 170                         printk ("LNX1/%8s:", name);
 171                 else
 172                         printk("(nonl)/%8s:", name);
 173                 offset = (info->label_block + 1);
 174                 size = i_size >> 9;
 175                 put_partition(state, 1, offset*(blocksize >> 9),
 176                               size-offset*(blocksize >> 9));
 177         }
 178
 179         printk("\n");
 180         goto out_freeall;
 181
 182
 183 out_readerr:
 184         res = -1;
 185 out_freeall:
 186         kfree(label);
 187 out_nolab:
 188         kfree(geo);
 189 out_nogeo:
 190         kfree(info);
 191 out_exit:
 192         return res;
 193 }