drivers/s390/block/dasd_fba.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_fba.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   6  *
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/stddef.h>
  11 #include <linux/kernel.h>
  12 #include <asm/debug.h>
  13
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/idals.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/io.h>
  23 #include <asm/todclk.h>
  24 #include <asm/ccwdev.h>
  25
  26 #include "dasd_int.h"
  27 #include "dasd_fba.h"
  28
  29 #ifdef PRINTK_HEADER
  30 #undef PRINTK_HEADER
  31 #endif                          /* PRINTK_HEADER */
  32 #define PRINTK_HEADER "dasd(fba):"
  33
  34 #define DASD_FBA_CCW_WRITE 0x41
  35 #define DASD_FBA_CCW_READ 0x42
  36 #define DASD_FBA_CCW_LOCATE 0x43
  37 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  38
  39 MODULE_LICENSE("GPL");
  40
  41 static struct dasd_discipline dasd_fba_discipline;
  42
  43 struct dasd_fba_private {
  44         struct dasd_fba_characteristics rdc_data;
  45 };
  46
  47 static struct ccw_device_id dasd_fba_ids[] = {
  48         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), driver_info: 0x1},
  49         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), driver_info: 0x2},
  50         { /* end of list */ },
  51 };
  52
  53 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  54
  55 static struct ccw_driver dasd_fba_driver; /* see below */
  56 static int
  57 dasd_fba_probe(struct ccw_device *cdev)
  58 {
  59         int ret;
  60
  61         ret = dasd_generic_probe (cdev, &dasd_fba_discipline);
  62         if (ret)
  63                 return ret;
  64         ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
  65         return 0;
  66 }
  67
  68 static int
  69 dasd_fba_set_online(struct ccw_device *cdev)
  70 {
  71         return dasd_generic_set_online (cdev, &dasd_fba_discipline);
  72 }
  73
  74 static struct ccw_driver dasd_fba_driver = {
  75         .name        = "dasd-fba",
  76         .owner       = THIS_MODULE,
  77         .ids         = dasd_fba_ids,
  78         .probe       = dasd_fba_probe,
  79         .remove      = dasd_generic_remove,
  80         .set_offline = dasd_generic_set_offline,
  81         .set_online  = dasd_fba_set_online,
  82         .notify      = dasd_generic_notify,
  83 };
  84
  85 static inline void
  86 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  87               int blksize, int beg, int nr)
  88 {
  89         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  90         ccw->flags = 0;
  91         ccw->count = 16;
  92         ccw->cda = (__u32) __pa(data);
  93         memset(data, 0, sizeof (struct DE_fba_data));
  94         if (rw == WRITE)
  95                 (data->mask).perm = 0x0;
  96         else if (rw == READ)
  97                 (data->mask).perm = 0x1;
  98         else
  99                 data->mask.perm = 0x2;
 100         data->blk_size = blksize;
 101         data->ext_loc = beg;
 102         data->ext_end = nr - 1;
 103 }
 104
 105 static inline void
 106 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 107               int block_nr, int block_ct)
 108 {
 109         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 110         ccw->flags = 0;
 111         ccw->count = 8;
 112         ccw->cda = (__u32) __pa(data);
 113         memset(data, 0, sizeof (struct LO_fba_data));
 114         if (rw == WRITE)
 115                 data->operation.cmd = 0x5;
 116         else if (rw == READ)
 117                 data->operation.cmd = 0x6;
 118         else
 119                 data->operation.cmd = 0x8;
 120         data->blk_nr = block_nr;
 121         data->blk_ct = block_ct;
 122 }
 123
 124 static int
 125 dasd_fba_check_characteristics(struct dasd_device *device)
 126 {
 127         struct dasd_fba_private *private;
 128         struct ccw_device *cdev = device->cdev;
 129         void *rdc_data;
 130         int rc;
 131
 132         private = (struct dasd_fba_private *) device->private;
 133         if (private == NULL) {
 134                 private = kmalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
 135                 if (private == NULL) {
 136                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 137                                     "memory allocation failed for private "
 138                                     "data");
 139                         return -ENOMEM;
 140                 }
 141                 device->private = (void *) private;
 142         }
 143         /* Read Device Characteristics */
 144         rdc_data = (void *) &(private->rdc_data);
 145         rc = read_dev_chars(device->cdev, &rdc_data, 32);
 146         if (rc) {
 147                 DEV_MESSAGE(KERN_WARNING, device,
 148                             "Read device characteristics returned error %d",
 149                             rc);
 150                 return rc;
 151         }
 152
 153         DEV_MESSAGE(KERN_INFO, device,
 154                     "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
 155                     cdev->id.dev_type,
 156                     cdev->id.dev_model,
 157                     cdev->id.cu_type,
 158                     cdev->id.cu_model,
 159                     ((private->rdc_data.blk_bdsa *
 160                       (private->rdc_data.blk_size >> 9)) >> 11),
 161                     private->rdc_data.blk_size);
 162         return 0;
 163 }
 164
 165 static int
 166 dasd_fba_do_analysis(struct dasd_device *device)
 167 {
 168         struct dasd_fba_private *private;
 169         int sb, rc;
 170
 171         private = (struct dasd_fba_private *) device->private;
 172         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 173         if (rc) {
 174                 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
 175                             private->rdc_data.blk_size);
 176                 return rc;
 177         }
 178         device->blocks = private->rdc_data.blk_bdsa;
 179         device->bp_block = private->rdc_data.blk_size;
 180         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 181         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 182                 device->s2b_shift++;
 183         return 0;
 184 }
 185
 186 static int
 187 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 188 {
 189         if (dasd_check_blocksize(device->bp_block) != 0)
 190                 return -EINVAL;
 191         geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
 192         geo->heads = 16;
 193         geo->sectors = 128 >> device->s2b_shift;
 194         return 0;
 195 }
 196
 197 static dasd_era_t
 198 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
 199 {
 200         struct dasd_device *device;
 201         struct ccw_device *cdev;
 202
 203         device = (struct dasd_device *) cqr->device;
 204         if (irb->scsw.cstat == 0x00 &&
 205             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
 206                 return dasd_era_none;
 207
 208         cdev = device->cdev;
 209         switch (cdev->id.dev_type) {
 210         case 0x3370:
 211                 return dasd_3370_erp_examine(cqr, irb);
 212         case 0x9336:
 213                 return dasd_9336_erp_examine(cqr, irb);
 214         default:
 215                 return dasd_era_recover;
 216         }
 217 }
 218
 219 static dasd_erp_fn_t
 220 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 221 {
 222         return dasd_default_erp_action;
 223 }
 224
 225 static dasd_erp_fn_t
 226 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 227 {
 228         if (cqr->function == dasd_default_erp_action)
 229                 return dasd_default_erp_postaction;
 230
 231         DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
 232                     cqr->function);
 233         return NULL;
 234 }
 235
 236 static struct dasd_ccw_req *
 237 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
 238 {
 239         struct dasd_fba_private *private;
 240         unsigned long *idaws;
 241         struct LO_fba_data *LO_data;
 242         struct dasd_ccw_req *cqr;
 243         struct ccw1 *ccw;
 244         struct bio *bio;
 245         struct bio_vec *bv;
 246         char *dst;
 247         int count, cidaw, cplength, datasize;
 248         sector_t recid, first_rec, last_rec;
 249         unsigned int blksize, off;
 250         unsigned char cmd;
 251         int i;
 252
 253         private = (struct dasd_fba_private *) device->private;
 254         if (rq_data_dir(req) == READ) {
 255                 cmd = DASD_FBA_CCW_READ;
 256         } else if (rq_data_dir(req) == WRITE) {
 257                 cmd = DASD_FBA_CCW_WRITE;
 258         } else
 259                 return ERR_PTR(-EINVAL);
 260         blksize = device->bp_block;
 261         /* Calculate record id of first and last block. */
 262         first_rec = req->sector >> device->s2b_shift;
 263         last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
 264         /* Check struct bio and count the number of blocks for the request. */
 265         count = 0;
 266         cidaw = 0;
 267         rq_for_each_bio(bio, req) {
 268                 bio_for_each_segment(bv, bio, i) {
 269                         if (bv->bv_len & (blksize - 1))
 270                                 /* Fba can only do full blocks. */
 271                                 return ERR_PTR(-EINVAL);
 272                         count += bv->bv_len >> (device->s2b_shift + 9);
 273 #if defined(CONFIG_64BIT)
 274                         if (idal_is_needed (page_address(bv->bv_page),
 275                                             bv->bv_len))
 276                                 cidaw += bv->bv_len / blksize;
 277 #endif
 278                 }
 279         }
 280         /* Paranoia. */
 281         if (count != last_rec - first_rec + 1)
 282                 return ERR_PTR(-EINVAL);
 283         /* 1x define extent + 1x locate record + number of blocks */
 284         cplength = 2 + count;
 285         /* 1x define extent + 1x locate record */
 286         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 287                 cidaw * sizeof(unsigned long);
 288         /*
 289          * Find out number of additional locate record ccws if the device
 290          * can't do data chaining.
 291          */
 292         if (private->rdc_data.mode.bits.data_chain == 0) {
 293                 cplength += count - 1;
 294                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 295         }
 296         /* Allocate the ccw request. */
 297         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
 298                                    cplength, datasize, device);
 299         if (IS_ERR(cqr))
 300                 return cqr;
 301         ccw = cqr->cpaddr;
 302         /* First ccw is define extent. */
 303         define_extent(ccw++, cqr->data, rq_data_dir(req),
 304                       device->bp_block, req->sector, req->nr_sectors);
 305         /* Build locate_record + read/write ccws. */
 306         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 307         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 308         /* Locate record for all blocks for smart devices. */
 309         if (private->rdc_data.mode.bits.data_chain != 0) {
 310                 ccw[-1].flags |= CCW_FLAG_CC;
 311                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 312         }
 313         recid = first_rec;
 314         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
 315                 dst = page_address(bv->bv_page) + bv->bv_offset;
 316                 if (dasd_page_cache) {
 317                         char *copy = kmem_cache_alloc(dasd_page_cache,
 318                                                       SLAB_DMA | __GFP_NOWARN);
 319                         if (copy && rq_data_dir(req) == WRITE)
 320                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
 321                         if (copy)
 322                                 dst = copy + bv->bv_offset;
 323                 }
 324                 for (off = 0; off < bv->bv_len; off += blksize) {
 325                         /* Locate record for stupid devices. */
 326                         if (private->rdc_data.mode.bits.data_chain == 0) {
 327                                 ccw[-1].flags |= CCW_FLAG_CC;
 328                                 locate_record(ccw, LO_data++,
 329                                               rq_data_dir(req),
 330                                               recid - first_rec, 1);
 331                                 ccw->flags = CCW_FLAG_CC;
 332                                 ccw++;
 333                         } else {
 334                                 if (recid > first_rec)
 335                                         ccw[-1].flags |= CCW_FLAG_DC;
 336                                 else
 337                                         ccw[-1].flags |= CCW_FLAG_CC;
 338                         }
 339                         ccw->cmd_code = cmd;
 340                         ccw->count = device->bp_block;
 341                         if (idal_is_needed(dst, blksize)) {
 342                                 ccw->cda = (__u32)(addr_t) idaws;
 343                                 ccw->flags = CCW_FLAG_IDA;
 344                                 idaws = idal_create_words(idaws, dst, blksize);
 345                         } else {
 346                                 ccw->cda = (__u32)(addr_t) dst;
 347                                 ccw->flags = 0;
 348                         }
 349                         ccw++;
 350                         dst += blksize;
 351                         recid++;
 352                 }
 353         }
 354         if (req->flags & REQ_FAILFAST)
 355                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 356         cqr->device = device;
 357         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
 358         cqr->retries = 32;
 359         cqr->buildclk = get_clock();
 360         cqr->status = DASD_CQR_FILLED;
 361         return cqr;
 362 }
 363
 364 static int
 365 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 366 {
 367         struct dasd_fba_private *private;
 368         struct ccw1 *ccw;
 369         struct bio *bio;
 370         struct bio_vec *bv;
 371         char *dst, *cda;
 372         unsigned int blksize, off;
 373         int i, status;
 374
 375         if (!dasd_page_cache)
 376                 goto out;
 377         private = (struct dasd_fba_private *) cqr->device->private;
 378         blksize = cqr->device->bp_block;
 379         ccw = cqr->cpaddr;
 380         /* Skip over define extent & locate record. */
 381         ccw++;
 382         if (private->rdc_data.mode.bits.data_chain != 0)
 383                 ccw++;
 384         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
 385                 dst = page_address(bv->bv_page) + bv->bv_offset;
 386                 for (off = 0; off < bv->bv_len; off += blksize) {
 387                         /* Skip locate record. */
 388                         if (private->rdc_data.mode.bits.data_chain == 0)
 389                                 ccw++;
 390                         if (dst) {
 391                                 if (ccw->flags & CCW_FLAG_IDA)
 392                                         cda = *((char **)((addr_t) ccw->cda));
 393                                 else
 394                                         cda = (char *)((addr_t) ccw->cda);
 395                                 if (dst != cda) {
 396                                         if (rq_data_dir(req) == READ)
 397                                                 memcpy(dst, cda, bv->bv_len);
 398                                         kmem_cache_free(dasd_page_cache,
 399                                             (void *)((addr_t)cda & PAGE_MASK));
 400                                 }
 401                                 dst = NULL;
 402                         }
 403                         ccw++;
 404                 }
 405         }
 406 out:
 407         status = cqr->status == DASD_CQR_DONE;
 408         dasd_sfree_request(cqr, cqr->device);
 409         return status;
 410 }
 411
 412 static int
 413 dasd_fba_fill_info(struct dasd_device * device,
 414                    struct dasd_information2_t * info)
 415 {
 416         info->label_block = 1;
 417         info->FBA_layout = 1;
 418         info->format = DASD_FORMAT_LDL;
 419         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
 420         memcpy(info->characteristics,
 421                &((struct dasd_fba_private *) device->private)->rdc_data,
 422                sizeof (struct dasd_fba_characteristics));
 423         info->confdata_size = 0;
 424         return 0;
 425 }
 426
 427 static void
 428 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 429                     struct irb *irb)
 430 {
 431         char *page;
 432         struct ccw1 *act, *end, *last;
 433         int len, sl, sct, count;
 434
 435         page = (char *) get_zeroed_page(GFP_ATOMIC);
 436         if (page == NULL) {
 437                 DEV_MESSAGE(KERN_ERR, device, " %s",
 438                             "No memory to dump sense data");
 439                 return;
 440         }
 441         len = sprintf(page, KERN_ERR PRINTK_HEADER
 442                       " I/O status report for device %s:\n",
 443                       device->cdev->dev.bus_id);
 444         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 445                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 446                        irb->scsw.cstat, irb->scsw.dstat);
 447         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 448                        " device %s: Failing CCW: %p\n",
 449                        device->cdev->dev.bus_id,
 450                        (void *) (addr_t) irb->scsw.cpa);
 451         if (irb->esw.esw0.erw.cons) {
 452                 for (sl = 0; sl < 4; sl++) {
 453                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 454                                        " Sense(hex) %2d-%2d:",
 455                                        (8 * sl), ((8 * sl) + 7));
 456
 457                         for (sct = 0; sct < 8; sct++) {
 458                                 len += sprintf(page + len, " %02x",
 459                                                irb->ecw[8 * sl + sct]);
 460                         }
 461                         len += sprintf(page + len, "\n");
 462                 }
 463         } else {
 464                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 465                                " SORRY - NO VALID SENSE AVAILABLE\n");
 466         }
 467         MESSAGE_LOG(KERN_ERR, "%s",
 468                     page + sizeof(KERN_ERR PRINTK_HEADER));
 469
 470         /* dump the Channel Program */
 471         /* print first CCWs (maximum 8) */
 472         act = req->cpaddr;
 473         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 474         end = min(act + 8, last);
 475         len = sprintf(page, KERN_ERR PRINTK_HEADER
 476                       " Related CP in req: %p\n", req);
 477         while (act <= end) {
 478                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 479                                " CCW %p: %08X %08X DAT:",
 480                                act, ((int *) act)[0], ((int *) act)[1]);
 481                 for (count = 0; count < 32 && count < act->count;
 482                      count += sizeof(int))
 483                         len += sprintf(page + len, " %08X",
 484                                        ((int *) (addr_t) act->cda)
 485                                        [(count>>2)]);
 486                 len += sprintf(page + len, "\n");
 487                 act++;
 488         }
 489         MESSAGE_LOG(KERN_ERR, "%s",
 490                     page + sizeof(KERN_ERR PRINTK_HEADER));
 491
 492
 493         /* print failing CCW area */
 494         len = 0;
 495         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
 496                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
 497                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 498         }
 499         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
 500         while (act <= end) {
 501                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 502                                " CCW %p: %08X %08X DAT:",
 503                                act, ((int *) act)[0], ((int *) act)[1]);
 504                 for (count = 0; count < 32 && count < act->count;
 505                      count += sizeof(int))
 506                         len += sprintf(page + len, " %08X",
 507                                        ((int *) (addr_t) act->cda)
 508                                        [(count>>2)]);
 509                 len += sprintf(page + len, "\n");
 510                 act++;
 511         }
 512
 513         /* print last CCWs */
 514         if (act <  last - 2) {
 515                 act = last - 2;
 516                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 517         }
 518         while (act <= last) {
 519                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 520                                " CCW %p: %08X %08X DAT:",
 521                                act, ((int *) act)[0], ((int *) act)[1]);
 522                 for (count = 0; count < 32 && count < act->count;
 523                      count += sizeof(int))
 524                         len += sprintf(page + len, " %08X",
 525                                        ((int *) (addr_t) act->cda)
 526                                        [(count>>2)]);
 527                 len += sprintf(page + len, "\n");
 528                 act++;
 529         }
 530         if (len > 0)
 531                 MESSAGE_LOG(KERN_ERR, "%s",
 532                             page + sizeof(KERN_ERR PRINTK_HEADER));
 533         free_page((unsigned long) page);
 534 }
 535
 536 /*
 537  * max_blocks is dependent on the amount of storage that is available
 538  * in the static io buffer for each device. Currently each device has
 539  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 540  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 541  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 542  * addition we have one define extent ccw + 16 bytes of data and a
 543  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 544  * That makes:
 545  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 546  * We want to fit two into the available memory so that we can immediately
 547  * start the next request if one finishes off. That makes 100.1 blocks
 548  * for one request. Give a little safety and the result is 96.
 549  */
 550 static struct dasd_discipline dasd_fba_discipline = {
 551         .owner = THIS_MODULE,
 552         .name = "FBA ",
 553         .ebcname = "FBA ",
 554         .max_blocks = 96,
 555         .check_device = dasd_fba_check_characteristics,
 556         .do_analysis = dasd_fba_do_analysis,
 557         .fill_geometry = dasd_fba_fill_geometry,
 558         .start_IO = dasd_start_IO,
 559         .term_IO = dasd_term_IO,
 560         .examine_error = dasd_fba_examine_error,
 561         .erp_action = dasd_fba_erp_action,
 562         .erp_postaction = dasd_fba_erp_postaction,
 563         .build_cp = dasd_fba_build_cp,
 564         .free_cp = dasd_fba_free_cp,
 565         .dump_sense = dasd_fba_dump_sense,
 566         .fill_info = dasd_fba_fill_info,
 567 };
 568
 569 static int __init
 570 dasd_fba_init(void)
 571 {
 572         int ret;
 573
 574         ASCEBC(dasd_fba_discipline.ebcname, 4);
 575
 576         ret = ccw_driver_register(&dasd_fba_driver);
 577         if (ret)
 578                 return ret;
 579
 580         dasd_generic_auto_online(&dasd_fba_driver);
 581         return 0;
 582 }
 583
 584 static void __exit
 585 dasd_fba_cleanup(void)
 586 {
 587         ccw_driver_unregister(&dasd_fba_driver);
 588 }
 589
 590 module_init(dasd_fba_init);
 591 module_exit(dasd_fba_cleanup);
 592
 593 /*
 594  * Overrides for Emacs so that we follow Linus's tabbing style.
 595  * Emacs will notice this stuff at the end of the file and automatically
 596  * adjust the settings for this buffer only.  This must remain at the end
 597  * of the file.
 598  * ---------------------------------------------------------------------------
 599  * Local variables:
 600  * c-indent-level: 4
 601  * c-brace-imaginary-offset: 0
 602  * c-brace-offset: -4
 603  * c-argdecl-indent: 4
 604  * c-label-offset: -4
 605  * c-continued-statement-offset: 4
 606  * c-continued-brace-offset: 0
 607  * indent-tabs-mode: 1
 608  * tab-width: 8
 609  * End:
 610  */