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  * History of changes (starts July 2000)
   9  * 07/10/00 Fixed detection of CMS formatted disks
  10  * 02/13/00 VTOC partition support added
  11  * 12/27/01 fixed PL030593 (CMS reserved minidisk not detected on 64 bit)
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/fs.h>
  16 #include <linux/genhd.h>
  17 #include <linux/kernel.h>
  18 #include <linux/major.h>
  19 #include <linux/string.h>
  20 #include <linux/blk.h>
  21 #include <linux/slab.h>
  22 #include <linux/hdreg.h>
  23 #include <linux/ioctl.h>
  24 #include <linux/version.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/dasd.h>
  28
  29 #include "ibm.h"
  30 #include "check.h"
  31 #include <asm/vtoc.h>
  32
  33 /*
  34  * compute the block number from a
  35  * cyl-cyl-head-head structure
  36  */
  37 static inline int
  38 cchh2blk (cchh_t *ptr, struct hd_geometry *geo) {
  39         return ptr->cc * geo->heads * geo->sectors +
  40                ptr->hh * geo->sectors;
  41 }
  42
  43
  44 /*
  45  * compute the block number from a
  46  * cyl-cyl-head-head-block structure
  47  */
  48 static inline int
  49 cchhb2blk (cchhb_t *ptr, struct hd_geometry *geo) {
  50         return ptr->cc * geo->heads * geo->sectors +
  51                 ptr->hh * geo->sectors +
  52                 ptr->b;
  53 }
  54
  55 /*
  56  * We used to use ioctl_by_bdev in early 2.4, but it broke
  57  * between 2.4.9 and 2.4.18 somewhere.
  58  */
  59 extern int (*genhd_dasd_ioctl)(struct inode *inp, struct file *filp,
  60                             unsigned int no, unsigned long data);
  61
  62 static int
  63 ibm_ioctl_unopened(struct block_device *bdev, unsigned cmd, unsigned long arg)
  64 {
  65         int res;
  66         mm_segment_t old_fs = get_fs();
  67
  68         if (genhd_dasd_ioctl == NULL)
  69                 return -ENODEV;
  70 #if 0
  71         lock_kernel();
  72         if (bd_ops->owner)
  73                 __MOD_INC_USE_COUNT(bdev->bd_op->owner);
  74         unlock_kernel();
  75 #endif
  76         set_fs(KERNEL_DS);
  77         res = (*genhd_dasd_ioctl)(bdev->bd_inode, NULL, cmd, arg);
  78         set_fs(old_fs);
  79 #if 0
  80         lock_kernel();
  81         if (bd_ops->owner)
  82                 __MOD_DEV_USE_COUNT(bd_ops->owner);
  83         unlock_kernel();
  84 #endif
  85         return res;
  86 }
  87
  88 /*
  89  */
  90 int
  91 ibm_partition(struct gendisk *hd, struct block_device *bdev,
  92               unsigned long first_sector, int first_part_minor)
  93 {
  94         int blocksize, offset, size;
  95         dasd_information_t *info;
  96         struct hd_geometry *geo;
  97         char type[5] = {0,};
  98         char name[7] = {0,};
  99         volume_label_t *vlabel;
 100         unsigned char *data;
 101         Sector sect;
 102
 103         if ( first_sector != 0 )
 104                 BUG();
 105
 106         if ((info = kmalloc(sizeof(dasd_information_t), GFP_KERNEL)) == NULL)
 107                 goto out_noinfo;
 108         if ((geo = kmalloc(sizeof(struct hd_geometry), GFP_KERNEL)) == NULL)
 109                 goto out_nogeo;
 110         if ((vlabel = kmalloc(sizeof(volume_label_t), GFP_KERNEL)) == NULL)
 111                 goto out_novlab;
 112
 113         if (ibm_ioctl_unopened(bdev, BIODASDINFO, (unsigned long)info) != 0 ||
 114             ibm_ioctl_unopened(bdev, HDIO_GETGEO, (unsigned long)geo) != 0)
 115                 goto out_noioctl;
 116
 117         if ((blocksize = get_hardsect_size(to_kdev_t(bdev->bd_dev))) <= 0)
 118                 goto out_badsect;
 119
 120         /*
 121          * Get volume label, extract name and type.
 122          */
 123         data = read_dev_sector(bdev, info->label_block*(blocksize/512), &sect);
 124         if (data == NULL)
 125                 goto out_readerr;
 126         strncpy (type, data, 4);
 127         if ((!info->FBA_layout) && (!strcmp(info->type, "ECKD")))
 128                 strncpy(name, data + 8, 6);
 129         else
 130                 strncpy(name, data + 4, 6);
 131         memcpy (vlabel, data, sizeof(volume_label_t));
 132         put_dev_sector(sect);
 133
 134         EBCASC(type, 4);
 135         EBCASC(name, 6);
 136
 137         /*
 138          * Three different types: CMS1, VOL1 and LNX1/unlabeled
 139          */
 140         if (strncmp(type, "CMS1", 4) == 0) {
 141                 /*
 142                  * VM style CMS1 labeled disk
 143                  */
 144                 int *label = (int *) data;
 145
 146                 if (label[13] != 0) {
 147                         printk("CMS1/%8s(MDSK):", name);
 148                         /* disk is reserved minidisk */
 149                         blocksize = label[3];
 150                         offset = label[13];
 151                         size = (label[7] - 1)*(blocksize >> 9);
 152                 } else {
 153                         printk("CMS1/%8s:", name);
 154                         offset = (info->label_block + 1);
 155                         size = bdev->bd_inode->i_size >> 9;
 156                 }
 157                 // add_gd_partition(hd, first_part_minor - 1, 0, size);
 158                 add_gd_partition(hd, first_part_minor,
 159                                  offset*(blocksize >> 9),
 160                                  size-offset*(blocksize >> 9));
 161         } else if (strncmp(type, "VOL1", 4) == 0) {
 162                 /*
 163                  * New style VOL1 labeled disk
 164                  */
 165                 unsigned int blk;
 166                 int counter;
 167
 168                 printk("VOL1/%8s:", name);
 169
 170                 /* get block number and read then go through format1 labels */
 171                 blk = cchhb2blk(&vlabel->vtoc, geo) + 1;
 172                 counter = 0;
 173                 while ((data = read_dev_sector(bdev, blk*(blocksize/512),
 174                                                &sect)) != NULL) {
 175                         format1_label_t f1;
 176
 177                         memcpy(&f1, data, sizeof(format1_label_t));
 178                         put_dev_sector(sect);
 179
 180                         /* skip FMT4 / FMT5 / FMT7 labels */
 181                         if (f1.DS1FMTID == _ascebc['4']
 182                             || f1.DS1FMTID == _ascebc['5']
 183                             || f1.DS1FMTID == _ascebc['7']) {
 184                                 blk++;
 185                                 continue;
 186                         }
 187
 188                         /* only FMT1 valid at this point */
 189                         if (f1.DS1FMTID != _ascebc['1'])
 190                                 break;
 191
 192                         /* OK, we got valid partition data */
 193                         offset = cchh2blk(&f1.DS1EXT1.llimit, geo);
 194                         size  = cchh2blk(&f1.DS1EXT1.ulimit, geo) -
 195                                 offset + geo->sectors;
 196                         if (counter >= hd->max_p)
 197                                 break;
 198                         add_gd_partition(hd, first_part_minor + counter,
 199                                          offset * (blocksize >> 9),
 200                                          size * (blocksize >> 9));
 201                         counter++;
 202                         blk++;
 203                 }
 204         } else {
 205                 /*
 206                  * Old style LNX1 or unlabeled disk
 207                  */
 208                 if (strncmp(type, "LNX1", 4) == 0)
 209                         printk ("LNX1/%8s:", name);
 210                 else
 211                         printk("(nonl)/%8s:", name);
 212                 offset = (info->label_block + 1);
 213                 size = (bdev->bd_inode->i_size >> 9);
 214                 // add_gd_partition(hd, first_part_minor - 1, 0, size);
 215                 add_gd_partition(hd, first_part_minor,
 216                                  offset*(blocksize >> 9),
 217                                   size-offset*(blocksize >> 9));
 218         }
 219
 220         printk("\n");
 221         kfree(vlabel);
 222         kfree(geo);
 223         kfree(info);
 224         return 1;
 225
 226 out_readerr:
 227 out_badsect:
 228 out_noioctl:
 229         kfree(vlabel);
 230 out_novlab:
 231         kfree(geo);
 232 out_nogeo:
 233         kfree(info);
 234 out_noinfo:
 235         return 0;
 236 }