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
  62 ibm_partition(struct parsed_partitions *state, struct block_device *bdev)
  63 {
  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
  78         res = 0;
  79         blocksize = bdev_logical_block_size(bdev);
  80         if (blocksize <= 0)
  81                 goto out_exit;
  82         i_size = i_size_read(bdev->bd_inode);
  83         if (i_size == 0)
  84                 goto out_exit;
  85
  86         info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
  87         if (info == NULL)
  88                 goto out_exit;
  89         geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
  90         if (geo == NULL)
  91                 goto out_nogeo;
  92         label = kmalloc(sizeof(union label_t), GFP_KERNEL);
  93         if (label == NULL)
  94                 goto out_nolab;
  95
  96         if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
  97             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
  98                 goto out_freeall;
  99
 100         /*
 101          * Get volume label, extract name and type.
 102          */
 103         data = read_dev_sector(bdev, info->label_block*(blocksize/512), &sect);
 104         if (data == NULL)
 105                 goto out_readerr;
 106
 107         memcpy(label, data, sizeof(union label_t));
 108         put_dev_sector(sect);
 109
 110         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD"))) {
 111                 strncpy(type, label->vol.vollbl, 4);
 112                 strncpy(name, label->vol.volid, 6);
 113         } else {
 114                 strncpy(type, label->lnx.vollbl, 4);
 115                 strncpy(name, label->lnx.volid, 6);
 116         }
 117         EBCASC(type, 4);
 118         EBCASC(name, 6);
 119
 120         res = 1;
 121
 122         /*
 123          * Three different formats: LDL, CDL and unformated disk
 124          *
 125          * identified by info->format
 126          *
 127          * unformated disks we do not have to care about
 128          */
 129         if (info->format == DASD_FORMAT_LDL) {
 130                 if (strncmp(type, "CMS1", 4) == 0) {
 131                         /*
 132                          * VM style CMS1 labeled disk
 133                          */
 134                         blocksize = label->cms.block_size;
 135                         if (label->cms.disk_offset != 0) {
 136                                 printk("CMS1/%8s(MDSK):", name);
 137                                 /* disk is reserved minidisk */
 138                                 offset = label->cms.disk_offset;
 139                                 size = (label->cms.block_count - 1)
 140                                         * (blocksize >> 9);
 141                         } else {
 142                                 printk("CMS1/%8s:", name);
 143                                 offset = (info->label_block + 1);
 144                                 size = label->cms.block_count
 145                                         * (blocksize >> 9);
 146                         }
 147                         put_partition(state, 1, offset*(blocksize >> 9),
 148                                       size-offset*(blocksize >> 9));
 149                 } else {
 150                         if (strncmp(type, "LNX1", 4) == 0) {
 151                                 printk("LNX1/%8s:", name);
 152                                 if (label->lnx.ldl_version == 0xf2) {
 153                                         fmt_size = label->lnx.formatted_blocks
 154                                                 * (blocksize >> 9);
 155                                 } else if (!strcmp(info->type, "ECKD")) {
 156                                         /* formated w/o large volume support */
 157                                         fmt_size = geo->cylinders * geo->heads
 158                                               * geo->sectors * (blocksize >> 9);
 159                                 } else {
 160                                         /* old label and no usable disk geometry
 161                                          * (e.g. DIAG) */
 162                                         fmt_size = i_size >> 9;
 163                                 }
 164                                 size = i_size >> 9;
 165                                 if (fmt_size < size)
 166                                         size = fmt_size;
 167                                 offset = (info->label_block + 1);
 168                         } else {
 169                                 /* unlabeled disk */
 170                                 printk("(nonl)");
 171                                 size = i_size >> 9;
 172                                 offset = (info->label_block + 1);
 173                         }
 174                         put_partition(state, 1, offset*(blocksize >> 9),
 175                                       size-offset*(blocksize >> 9));
 176                 }
 177         } else if (info->format == DASD_FORMAT_CDL) {
 178                 /*
 179                  * New style CDL formatted disk
 180                  */
 181                 sector_t blk;
 182                 int counter;
 183
 184                 /*
 185                  * check if VOL1 label is available
 186                  * if not, something is wrong, skipping partition detection
 187                  */
 188                 if (strncmp(type, "VOL1",  4) == 0) {
 189                         printk("VOL1/%8s:", name);
 190                         /*
 191                          * get block number and read then go through format1
 192                          * labels
 193                          */
 194                         blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
 195                         counter = 0;
 196                         data = read_dev_sector(bdev, blk * (blocksize/512),
 197                                                &sect);
 198                         while (data != NULL) {
 199                                 struct vtoc_format1_label f1;
 200
 201                                 memcpy(&f1, data,
 202                                        sizeof(struct vtoc_format1_label));
 203                                 put_dev_sector(sect);
 204
 205                                 /* skip FMT4 / FMT5 / FMT7 labels */
 206                                 if (f1.DS1FMTID == _ascebc['4']
 207                                     || f1.DS1FMTID == _ascebc['5']
 208                                     || f1.DS1FMTID == _ascebc['7']
 209                                     || f1.DS1FMTID == _ascebc['9']) {
 210                                         blk++;
 211                                         data = read_dev_sector(bdev, blk *
 212                                                                (blocksize/512),
 213                                                                 &sect);
 214                                         continue;
 215                                 }
 216
 217                                 /* only FMT1 and 8 labels valid at this point */
 218                                 if (f1.DS1FMTID != _ascebc['1'] &&
 219                                     f1.DS1FMTID != _ascebc['8'])
 220                                         break;
 221
 222                                 /* OK, we got valid partition data */
 223                                 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
 224                                 size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
 225                                         offset + geo->sectors;
 226                                 if (counter >= state->limit)
 227                                         break;
 228                                 put_partition(state, counter + 1,
 229                                               offset * (blocksize >> 9),
 230                                               size * (blocksize >> 9));
 231                                 counter++;
 232                                 blk++;
 233                                 data = read_dev_sector(bdev,
 234                                                        blk * (blocksize/512),
 235                                                        &sect);
 236                         }
 237
 238                         if (!data)
 239                                 /* Are we not supposed to report this ? */
 240                                 goto out_readerr;
 241                 } else
 242                         printk(KERN_WARNING "Warning, expected Label VOL1 not "
 243                                "found, treating as CDL formated Disk");
 244
 245         }
 246
 247         printk("\n");
 248         goto out_freeall;
 249
 250
 251 out_readerr:
 252         res = -1;
 253 out_freeall:
 254         kfree(label);
 255 out_nolab:
 256         kfree(geo);
 257 out_nogeo:
 258         kfree(info);
 259 out_exit:
 260         return res;
 261 }