git.oblomov.eu Git - linux-2.6/blob - 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;
  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         blocksize = bdev_hardsect_size(bdev);
  60         if (blocksize <= 0)
  61                 return 0;
  62         i_size = i_size_read(bdev->bd_inode);
  63         if (i_size == 0)
  64                 return 0;
  65
  66         if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
  67                 goto out_noinfo;
  68         if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
  69                 goto out_nogeo;
  70         if ((label = kmalloc(sizeof(union label_t), GFP_KERNEL)) == NULL)
  71                 goto out_nolab;
  72
  73         if (ioctl_by_bdev(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
  74             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
  75                 goto out_noioctl;
  76
  77         /*
  78          * Get volume label, extract name and type.
  79          */
  80         data = read_dev_sector(bdev, info->label_block*(blocksize/512), &sect);
  81         if (data == NULL)
  82                 goto out_readerr;
  83
  84         strncpy (type, data, 4);
  85         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
  86                 strncpy(name, data + 8, 6);
  87         else
  88                 strncpy(name, data + 4, 6);
  89         memcpy(label, data, sizeof(union label_t));
  90         put_dev_sector(sect);
  91
  92         EBCASC(type, 4);
  93         EBCASC(name, 6);
  94
  95         /*
  96          * Three different types: CMS1, VOL1 and LNX1/unlabeled
  97          */
  98         if (strncmp(type, "CMS1", 4) == 0) {
  99                 /*
 100                  * VM style CMS1 labeled disk
 101                  */
 102                 if (label->cms.disk_offset != 0) {
 103                         printk("CMS1/%8s(MDSK):", name);
 104                         /* disk is reserved minidisk */
 105                         blocksize = label->cms.block_size;
 106                         offset = label->cms.disk_offset;
 107                         size = (label->cms.block_count - 1) * (blocksize >> 9);
 108                 } else {
 109                         printk("CMS1/%8s:", name);
 110                         offset = (info->label_block + 1);
 111                         size = i_size >> 9;
 112                 }
 113                 put_partition(state, 1, offset*(blocksize >> 9),
 114                                  size-offset*(blocksize >> 9));
 115         } else if ((strncmp(type, "VOL1", 4) == 0) &&
 116                 (!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
 117                 /*
 118                  * New style VOL1 labeled disk
 119                  */
 120                 unsigned int blk;
 121                 int counter;
 122
 123                 printk("VOL1/%8s:", name);
 124
 125                 /* get block number and read then go through format1 labels */
 126                 blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
 127                 counter = 0;
 128                 while ((data = read_dev_sector(bdev, blk*(blocksize/512),
 129                                                &sect)) != NULL) {
 130                         struct vtoc_format1_label f1;
 131
 132                         memcpy(&f1, data, sizeof(struct vtoc_format1_label));
 133                         put_dev_sector(sect);
 134
 135                         /* skip FMT4 / FMT5 / FMT7 labels */
 136                         if (f1.DS1FMTID == _ascebc['4']
 137                             || f1.DS1FMTID == _ascebc['5']
 138                             || f1.DS1FMTID == _ascebc['7']) {
 139                                 blk++;
 140                                 continue;
 141                         }
 142
 143                         /* only FMT1 valid at this point */
 144                         if (f1.DS1FMTID != _ascebc['1'])
 145                                 break;
 146
 147                         /* OK, we got valid partition data */
 148                         offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
 149                         size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
 150                                 offset + geo->sectors;
 151                         if (counter >= state->limit)
 152                                 break;
 153                         put_partition(state, counter + 1,
 154                                       offset * (blocksize >> 9),
 155                                       size * (blocksize >> 9));
 156                         counter++;
 157                         blk++;
 158                 }
 159         } else {
 160                 /*
 161                  * Old style LNX1 or unlabeled disk
 162                  */
 163                 if (strncmp(type, "LNX1", 4) == 0)
 164                         printk ("LNX1/%8s:", name);
 165                 else
 166                         printk("(nonl)/%8s:", name);
 167                 offset = (info->label_block + 1);
 168                 size = i_size >> 9;
 169                 put_partition(state, 1, offset*(blocksize >> 9),
 170                               size-offset*(blocksize >> 9));
 171         }
 172
 173         printk("\n");
 174         kfree(label);
 175         kfree(geo);
 176         kfree(info);
 177         return 1;
 178
 179 out_readerr:
 180 out_noioctl:
 181         kfree(label);
 182 out_nolab:
 183         kfree(geo);
 184 out_nogeo:
 185         kfree(info);
 186 out_noinfo:
 187         return 0;
 188 }