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_information2_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         info = kmalloc(sizeof(dasd_information2_t), GFP_KERNEL);
  68         if (info == NULL)
  69                 goto out_exit;
  70         geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL);
  71         if (geo == NULL)
  72                 goto out_nogeo;
  73         label = kmalloc(sizeof(union label_t), GFP_KERNEL);
  74         if (label == NULL)
  75                 goto out_nolab;
  76
  77         if (ioctl_by_bdev(bdev, BIODASDINFO2, (unsigned long)info) != 0 ||
  78             ioctl_by_bdev(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
  79                 goto out_freeall;
  80
  81         /*
  82          * Get volume label, extract name and type.
  83          */
  84         data = read_dev_sector(bdev, info->label_block*(blocksize/512), &sect);
  85         if (data == NULL)
  86                 goto out_readerr;
  87
  88         strncpy (type, data, 4);
  89         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
  90                 strncpy(name, data + 8, 6);
  91         else
  92                 strncpy(name, data + 4, 6);
  93         memcpy(label, data, sizeof(union label_t));
  94         put_dev_sector(sect);
  95
  96         EBCASC(type, 4);
  97         EBCASC(name, 6);
  98
  99         res = 1;
 100
 101         /*
 102          * Three different formats: LDL, CDL and unformated disk
 103          *
 104          * identified by info->format
 105          *
 106          * unformated disks we do not have to care about
 107          */
 108         if (info->format == DASD_FORMAT_LDL) {
 109                 if (strncmp(type, "CMS1", 4) == 0) {
 110                         /*
 111                          * VM style CMS1 labeled disk
 112                          */
 113                         if (label->cms.disk_offset != 0) {
 114                                 printk("CMS1/%8s(MDSK):", name);
 115                                 /* disk is reserved minidisk */
 116                                 blocksize = label->cms.block_size;
 117                                 offset = label->cms.disk_offset;
 118                                 size = (label->cms.block_count - 1)
 119                                         * (blocksize >> 9);
 120                         } else {
 121                                 printk("CMS1/%8s:", name);
 122                                 offset = (info->label_block + 1);
 123                                 size = i_size >> 9;
 124                         }
 125                 } else {
 126                         /*
 127                          * Old style LNX1 or unlabeled disk
 128                          */
 129                         if (strncmp(type, "LNX1", 4) == 0)
 130                                 printk ("LNX1/%8s:", name);
 131                         else
 132                                 printk("(nonl)");
 133                         offset = (info->label_block + 1);
 134                         size = i_size >> 9;
 135                 }
 136                 put_partition(state, 1, offset*(blocksize >> 9),
 137                                       size-offset*(blocksize >> 9));
 138         } else if (info->format == DASD_FORMAT_CDL) {
 139                 /*
 140                  * New style CDL formatted disk
 141                  */
 142                 unsigned int blk;
 143                 int counter;
 144
 145                 /*
 146                  * check if VOL1 label is available
 147                  * if not, something is wrong, skipping partition detection
 148                  */
 149                 if (strncmp(type, "VOL1",  4) == 0) {
 150                         printk("VOL1/%8s:", name);
 151                         /*
 152                          * get block number and read then go through format1
 153                          * labels
 154                          */
 155                         blk = cchhb2blk(&label->vol.vtoc, geo) + 1;
 156                         counter = 0;
 157                         data = read_dev_sector(bdev, blk * (blocksize/512),
 158                                                &sect);
 159                         while (data != NULL) {
 160                                 struct vtoc_format1_label f1;
 161
 162                                 memcpy(&f1, data,
 163                                        sizeof(struct vtoc_format1_label));
 164                                 put_dev_sector(sect);
 165
 166                                 /* skip FMT4 / FMT5 / FMT7 labels */
 167                                 if (f1.DS1FMTID == _ascebc['4']
 168                                     || f1.DS1FMTID == _ascebc['5']
 169                                     || f1.DS1FMTID == _ascebc['7']) {
 170                                         blk++;
 171                                         data = read_dev_sector(bdev, blk *
 172                                                                (blocksize/512),
 173                                                                 &sect);
 174                                         continue;
 175                                 }
 176
 177                                 /* only FMT1 valid at this point */
 178                                 if (f1.DS1FMTID != _ascebc['1'])
 179                                         break;
 180
 181                                 /* OK, we got valid partition data */
 182                                 offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
 183                                 size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
 184                                         offset + geo->sectors;
 185                                 if (counter >= state->limit)
 186                                         break;
 187                                 put_partition(state, counter + 1,
 188                                               offset * (blocksize >> 9),
 189                                               size * (blocksize >> 9));
 190                                 counter++;
 191                                 blk++;
 192                                 data = read_dev_sector(bdev,
 193                                                        blk * (blocksize/512),
 194                                                        &sect);
 195                         }
 196
 197                         if (!data)
 198                                 /* Are we not supposed to report this ? */
 199                                 goto out_readerr;
 200                 } else
 201                         printk(KERN_WARNING "Warning, expected Label VOL1 not "
 202                                "found, treating as CDL formated Disk");
 203
 204         }
 205
 206         printk("\n");
 207         goto out_freeall;
 208
 209
 210 out_readerr:
 211         res = -1;
 212 out_freeall:
 213         kfree(label);
 214 out_nolab:
 215         kfree(geo);
 216 out_nogeo:
 217         kfree(info);
 218 out_exit:
 219         return res;
 220 }