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 sector_t
  25 cchh2blk (struct vtoc_cchh *ptr, struct hd_geometry *geo) {
  26
  27         sector_t cyl;
  28         __u16 head;
  29
  30         /*decode cylinder and heads for large volumes */
  31         cyl = ptr->hh & 0xFFF0;
  32         cyl <<= 12;
  33         cyl |= ptr->cc;
  34         head = ptr->hh & 0x000F;
  35         return cyl * geo->heads * geo->sectors +
  36                head * geo->sectors;
  37 }
  38
  39 /*
  40  * compute the block number from a
  41  * cyl-cyl-head-head-block structure
  42  */
  43 static sector_t
  44 cchhb2blk (struct vtoc_cchhb *ptr, struct hd_geometry *geo) {
  45
  46         sector_t cyl;
  47         __u16 head;
  48
  49         /*decode cylinder and heads for large volumes */
  50         cyl = ptr->hh & 0xFFF0;
  51         cyl <<= 12;
  52         cyl |= ptr->cc;
  53         head = ptr->hh & 0x000F;
  54         return  cyl * geo->heads * geo->sectors +
  55                 head * geo->sectors +
  56                 ptr->b;
  57 }
  58
  59 /*
  60  */
  61 int ibm_partition(struct parsed_partitions *state)
  62 {
  63         struct block_device *bdev = state->bdev;
  64         int blocksize, res;
  65         loff_t i_size, offset, size, fmt_size;
  66         dasd_information2_t *info;
  67         struct hd_geometry *geo;
  68         char type[5] = {0,};
  69         char name[7] = {0,};
  70         union label_t {
  71                 struct vtoc_volume_label_cdl vol;
  72                 struct vtoc_volume_label_ldl lnx;
  73                 struct vtoc_cms_label cms;
  74         } *label;
  75         unsigned char *data;
  76         Sector sect;
  77         sector_t labelsect;
  78
  79         res = 0;
  80         blocksize = bdev_logical_block_size(bdev);
  81         if (blocksize <= 0)
  82                 goto out_exit;
  83         i_size = i_size_read(bdev->bd_inode);
  84         if (i_size == 0)
  85                 goto out_exit;
  86
  87         info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
  88         if (info == NULL)
  89                 goto out_exit;
  90         geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
  91         if (geo == NULL)
  92                 goto out_nogeo;
  93         label = kmalloc(sizeof(union label_t), GFP_KERNEL);
  94         if (label == NULL)
  95                 goto out_nolab;
  96
  97         if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
  98             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
  99                 goto out_freeall;
 100
 101         /*
 102          * Special case for FBA disks: label sector does not depend on
 103          * blocksize.
 104          */
 105         if ((info->cu_type == 0x6310 && info->dev_type == 0x9336) ||
 106             (info->cu_type == 0x3880 && info->dev_type == 0x3370))
 107                 labelsect = info->label_block;
 108         else
 109                 labelsect = info->label_block * (blocksize >> 9);
 110
 111         /*
 112          * Get volume label, extract name and type.
 113          */
 114         data = read_part_sector(state, labelsect, &sect);
 115         if (data == NULL)
 116                 goto out_readerr;
 117
 118         memcpy(label, data, sizeof(union label_t));
 119         put_dev_sector(sect);
 120
 121         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
 122                 strncpy(type, label->vol.vollbl, 4);
 123                 strncpy(name, label->vol.volid, 6);
 124         } else {
 125                 strncpy(type, label->lnx.vollbl, 4);
 126                 strncpy(name, label->lnx.volid, 6);
 127         }
 128         EBCASC(type, 4);
 129         EBCASC(name, 6);
 130
 131         res = 1;
 132
 133         /*
 134          * Three different formats: LDL, CDL and unformated disk
 135          *
 136          * identified by info->format
 137          *
 138          * unformated disks we do not have to care about
 139          */
 140         if (info->format == DASD_FORMAT_LDL) {
 141                 if (strncmp(type, "CMS1", 4) == 0) {
 142                         /*
 143                          * VM style CMS1 labeled disk
 144                          */
 145                         blocksize = label->cms.block_size;
 146                         if (label->cms.disk_offset != 0) {
 147                                 printk("CMS1/%8s(MDSK):", name);
 148                                 /* disk is reserved minidisk */
 149                                 offset = label->cms.disk_offset;
 150                                 size = (label->cms.block_count - 1)
 151                                         * (blocksize >> 9);
 152                         } else {
 153                                 printk("CMS1/%8s:", name);
 154                                 offset = (info->label_block + 1);
 155                                 size = label->cms.block_count
 156                                         * (blocksize >> 9);
 157                         }
 158                         put_partition(state, 1, offset*(blocksize >> 9),
 159                                       size-offset*(blocksize >> 9));
 160                 } else {
 161                         if (strncmp(type, "LNX1", 4) == 0) {
 162                                 printk("LNX1/%8s:", name);
 163                                 if (label->lnx.ldl_version == 0xf2) {
 164                                         fmt_size = label->lnx.formatted_blocks
 165                                                 * (blocksize >> 9);
 166                                 } else if (!strcmp(info->type, "ECKD")) {
 167                                         /* formated w/o large volume support */
 168                                         fmt_size = geo->cylinders * geo->heads
 169                                               * geo->sectors * (blocksize >> 9);
 170                                 } else {
 171                                         /* old label and no usable disk geometry
 172                                          * (e.g. DIAG) */
 173                                         fmt_size = i_size >> 9;
 174                                 }
 175                                 size = i_size >> 9;
 176                                 if (fmt_size < size)
 177                                         size = fmt_size;
 178                                 offset = (info->label_block + 1);
 179                         } else {
 180                                 /* unlabeled disk */
 181                                 printk("(nonl)");
 182                                 size = i_size >> 9;
 183                                 offset = (info->label_block + 1);
 184                         }
 185                         put_partition(state, 1, offset*(blocksize >> 9),
 186                                       size-offset*(blocksize >> 9));
 187                 }
 188         } else if (info->format == DASD_FORMAT_CDL) {
 189                 /*
 190                  * New style CDL formatted disk
 191                  */
 192                 sector_t blk;
 193                 int counter;
 194
 195                 /*
 196                  * check if VOL1 label is available
 197                  * if not, something is wrong, skipping partition detection
 198                  */
 199                 if (strncmp(type, "VOL1",  4) == 0) {
 200                         printk("VOL1/%8s:", name);
 201                         /*
 202                          * get block number and read then go through format1
 203                          * labels
 204                          */
 205                         blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
 206                         counter = 0;
 207                         data = read_part_sector(state, blk * (blocksize/512),
 208                                                 &sect);
 209                         while (data != NULL) {
 210                                 struct vtoc_format1_label f1;
 211
 212                                 memcpy(&f1, data,
 213                                        sizeof(struct vtoc_format1_label));
 214                                 put_dev_sector(sect);
 215
 216                                 /* skip FMT4 / FMT5 / FMT7 labels */
 217                                 if (f1.DS1FMTID == _ascebc['4']
 218                                     || f1.DS1FMTID == _ascebc['5']
 219                                     || f1.DS1FMTID == _ascebc['7']
 220                                     || f1.DS1FMTID == _ascebc['9']) {
 221                                         blk++;
 222                                         data = read_part_sector(state,
 223                                                 blk * (blocksize/512), &sect);
 224                                         continue;
 225                                 }
 226
 227                                 /* only FMT1 and 8 labels valid at this point */
 228                                 if (f1.DS1FMTID != _ascebc['1'] &&
 229                                     f1.DS1FMTID != _ascebc['8'])
 230                                         break;
 231
 232                                 /* OK, we got valid partition data */
 233                                 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
 234                                 size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
 235                                         offset + geo->sectors;
 236                                 if (counter >= state->limit)
 237                                         break;
 238                                 put_partition(state, counter + 1,
 239                                               offset * (blocksize >> 9),
 240                                               size * (blocksize >> 9));
 241                                 counter++;
 242                                 blk++;
 243                                 data = read_part_sector(state,
 244                                                 blk * (blocksize/512), &sect);
 245                         }
 246
 247                         if (!data)
 248                                 /* Are we not supposed to report this ? */
 249                                 goto out_readerr;
 250                 } else
 251                         printk(KERN_WARNING "Warning, expected Label VOL1 not "
 252                                "found, treating as CDL formated Disk");
 253
 254         }
 255
 256         printk("\n");
 257         goto out_freeall;
 258
 259
 260 out_readerr:
 261         res = -1;
 262 out_freeall:
 263         kfree(label);
 264 out_nolab:
 265         kfree(geo);
 266 out_nogeo:
 267         kfree(info);
 268 out_exit:
 269         return res;
 270 }