kernel/drivers/s390/block/dasd_ioctl.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2001
   8  *
   9  * i/o controls for the dasd driver.
  10  */
  11
  12 #define KMSG_COMPONENT "dasd"
  13
  14 #include <linux/interrupt.h>
  15 #include <linux/compat.h>
  16 #include <linux/major.h>
  17 #include <linux/fs.h>
  18 #include <linux/blkpg.h>
  19 #include <linux/slab.h>
  20 #include <asm/compat.h>
  21 #include <asm/ccwdev.h>
  22 #include <asm/schid.h>
  23 #include <asm/cmb.h>
  24 #include <asm/uaccess.h>
  25
  26 /* This is ugly... */
  27 #define PRINTK_HEADER "dasd_ioctl:"
  28
  29 #include "dasd_int.h"
  30
  31
  32 static int
  33 dasd_ioctl_api_version(void __user *argp)
  34 {
  35         int ver = DASD_API_VERSION;
  36         return put_user(ver, (int __user *)argp);
  37 }
  38
  39 /*
  40  * Enable device.
  41  * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
  42  */
  43 static int
  44 dasd_ioctl_enable(struct block_device *bdev)
  45 {
  46         struct dasd_device *base;
  47
  48         if (!capable(CAP_SYS_ADMIN))
  49                 return -EACCES;
  50
  51         base = dasd_device_from_gendisk(bdev->bd_disk);
  52         if (!base)
  53                 return -ENODEV;
  54
  55         dasd_enable_device(base);
  56         /* Formatting the dasd device can change the capacity. */
  57         mutex_lock(&bdev->bd_mutex);
  58         i_size_write(bdev->bd_inode,
  59                      (loff_t)get_capacity(base->block->gdp) << 9);
  60         mutex_unlock(&bdev->bd_mutex);
  61         dasd_put_device(base);
  62         return 0;
  63 }
  64
  65 /*
  66  * Disable device.
  67  * Used by dasdfmt. Disable I/O operations but allow ioctls.
  68  */
  69 static int
  70 dasd_ioctl_disable(struct block_device *bdev)
  71 {
  72         struct dasd_device *base;
  73
  74         if (!capable(CAP_SYS_ADMIN))
  75                 return -EACCES;
  76
  77         base = dasd_device_from_gendisk(bdev->bd_disk);
  78         if (!base)
  79                 return -ENODEV;
  80         /*
  81          * Man this is sick. We don't do a real disable but only downgrade
  82          * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
  83          * BIODASDDISABLE to disable accesses to the device via the block
  84          * device layer but it still wants to do i/o on the device by
  85          * using the BIODASDFMT ioctl. Therefore the correct state for the
  86          * device is DASD_STATE_BASIC that allows to do basic i/o.
  87          */
  88         dasd_set_target_state(base, DASD_STATE_BASIC);
  89         /*
  90          * Set i_size to zero, since read, write, etc. check against this
  91          * value.
  92          */
  93         mutex_lock(&bdev->bd_mutex);
  94         i_size_write(bdev->bd_inode, 0);
  95         mutex_unlock(&bdev->bd_mutex);
  96         dasd_put_device(base);
  97         return 0;
  98 }
  99
 100 /*
 101  * Quiesce device.
 102  */
 103 static int dasd_ioctl_quiesce(struct dasd_block *block)
 104 {
 105         unsigned long flags;
 106         struct dasd_device *base;
 107
 108         base = block->base;
 109         if (!capable (CAP_SYS_ADMIN))
 110                 return -EACCES;
 111
 112         pr_info("%s: The DASD has been put in the quiesce "
 113                 "state\n", dev_name(&base->cdev->dev));
 114         spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 115         dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
 116         spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
 117         return 0;
 118 }
 119
 120
 121 /*
 122  * Resume device.
 123  */
 124 static int dasd_ioctl_resume(struct dasd_block *block)
 125 {
 126         unsigned long flags;
 127         struct dasd_device *base;
 128
 129         base = block->base;
 130         if (!capable (CAP_SYS_ADMIN))
 131                 return -EACCES;
 132
 133         pr_info("%s: I/O operations have been resumed "
 134                 "on the DASD\n", dev_name(&base->cdev->dev));
 135         spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 136         dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
 137         spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
 138
 139         dasd_schedule_block_bh(block);
 140         return 0;
 141 }
 142
 143 /*
 144  * Abort all failfast I/O on a device.
 145  */
 146 static int dasd_ioctl_abortio(struct dasd_block *block)
 147 {
 148         unsigned long flags;
 149         struct dasd_device *base;
 150         struct dasd_ccw_req *cqr, *n;
 151
 152         base = block->base;
 153         if (!capable(CAP_SYS_ADMIN))
 154                 return -EACCES;
 155
 156         if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
 157                 return 0;
 158         DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
 159
 160         spin_lock_irqsave(&block->request_queue_lock, flags);
 161         spin_lock(&block->queue_lock);
 162         list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
 163                 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
 164                     cqr->callback_data &&
 165                     cqr->callback_data != DASD_SLEEPON_START_TAG &&
 166                     cqr->callback_data != DASD_SLEEPON_END_TAG) {
 167                         spin_unlock(&block->queue_lock);
 168                         blk_abort_request(cqr->callback_data);
 169                         spin_lock(&block->queue_lock);
 170                 }
 171         }
 172         spin_unlock(&block->queue_lock);
 173         spin_unlock_irqrestore(&block->request_queue_lock, flags);
 174
 175         dasd_schedule_block_bh(block);
 176         return 0;
 177 }
 178
 179 /*
 180  * Allow I/O on a device
 181  */
 182 static int dasd_ioctl_allowio(struct dasd_block *block)
 183 {
 184         struct dasd_device *base;
 185
 186         base = block->base;
 187         if (!capable(CAP_SYS_ADMIN))
 188                 return -EACCES;
 189
 190         if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
 191                 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
 192
 193         return 0;
 194 }
 195
 196 /*
 197  * performs formatting of _device_ according to _fdata_
 198  * Note: The discipline's format_function is assumed to deliver formatting
 199  * commands to format multiple units of the device. In terms of the ECKD
 200  * devices this means CCWs are generated to format multiple tracks.
 201  */
 202 static int
 203 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
 204 {
 205         struct dasd_device *base;
 206         int enable_pav = 1;
 207         int rc, retries;
 208         int start, stop;
 209
 210         base = block->base;
 211         if (base->discipline->format_device == NULL)
 212                 return -EPERM;
 213
 214         if (base->state != DASD_STATE_BASIC) {
 215                 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
 216                         dev_name(&base->cdev->dev));
 217                 return -EBUSY;
 218         }
 219
 220         DBF_DEV_EVENT(DBF_NOTICE, base,
 221                       "formatting units %u to %u (%u B blocks) flags %u",
 222                       fdata->start_unit,
 223                       fdata->stop_unit, fdata->blksize, fdata->intensity);
 224
 225         /* Since dasdfmt keeps the device open after it was disabled,
 226          * there still exists an inode for this device.
 227          * We must update i_blkbits, otherwise we might get errors when
 228          * enabling the device later.
 229          */
 230         if (fdata->start_unit == 0) {
 231                 struct block_device *bdev = bdget_disk(block->gdp, 0);
 232                 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
 233                 bdput(bdev);
 234         }
 235
 236         retries = 255;
 237         /* backup start- and endtrack for retries */
 238         start = fdata->start_unit;
 239         stop = fdata->stop_unit;
 240         do {
 241                 rc = base->discipline->format_device(base, fdata, enable_pav);
 242                 if (rc) {
 243                         if (rc == -EAGAIN) {
 244                                 retries--;
 245                                 /* disable PAV in case of errors */
 246                                 enable_pav = 0;
 247                                 fdata->start_unit = start;
 248                                 fdata->stop_unit = stop;
 249                         } else
 250                                 return rc;
 251                 } else
 252                         /* success */
 253                         break;
 254         } while (retries);
 255
 256         if (!retries)
 257                 return -EIO;
 258         else
 259                 return 0;
 260 }
 261
 262 /*
 263  * Format device.
 264  */
 265 static int
 266 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
 267 {
 268         struct dasd_device *base;
 269         struct format_data_t fdata;
 270         int rc;
 271
 272         if (!capable(CAP_SYS_ADMIN))
 273                 return -EACCES;
 274         if (!argp)
 275                 return -EINVAL;
 276         base = dasd_device_from_gendisk(bdev->bd_disk);
 277         if (!base)
 278                 return -ENODEV;
 279         if (base->features & DASD_FEATURE_READONLY ||
 280             test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
 281                 dasd_put_device(base);
 282                 return -EROFS;
 283         }
 284         if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
 285                 dasd_put_device(base);
 286                 return -EFAULT;
 287         }
 288         if (bdev != bdev->bd_contains) {
 289                 pr_warning("%s: The specified DASD is a partition and cannot "
 290                            "be formatted\n",
 291                            dev_name(&base->cdev->dev));
 292                 dasd_put_device(base);
 293                 return -EINVAL;
 294         }
 295         rc = dasd_format(base->block, &fdata);
 296         dasd_put_device(base);
 297         return rc;
 298 }
 299
 300 #ifdef CONFIG_DASD_PROFILE
 301 /*
 302  * Reset device profile information
 303  */
 304 static int dasd_ioctl_reset_profile(struct dasd_block *block)
 305 {
 306         dasd_profile_reset(&block->profile);
 307         return 0;
 308 }
 309
 310 /*
 311  * Return device profile information
 312  */
 313 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 314 {
 315         struct dasd_profile_info_t *data;
 316         int rc = 0;
 317
 318         data = kmalloc(sizeof(*data), GFP_KERNEL);
 319         if (!data)
 320                 return -ENOMEM;
 321
 322         spin_lock_bh(&block->profile.lock);
 323         if (block->profile.data) {
 324                 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
 325                 data->dasd_io_sects = block->profile.data->dasd_io_sects;
 326                 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
 327                        sizeof(data->dasd_io_secs));
 328                 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
 329                        sizeof(data->dasd_io_times));
 330                 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
 331                        sizeof(data->dasd_io_timps));
 332                 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
 333                        sizeof(data->dasd_io_time1));
 334                 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
 335                        sizeof(data->dasd_io_time2));
 336                 memcpy(data->dasd_io_time2ps,
 337                        block->profile.data->dasd_io_time2ps,
 338                        sizeof(data->dasd_io_time2ps));
 339                 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
 340                        sizeof(data->dasd_io_time3));
 341                 memcpy(data->dasd_io_nr_req,
 342                        block->profile.data->dasd_io_nr_req,
 343                        sizeof(data->dasd_io_nr_req));
 344                 spin_unlock_bh(&block->profile.lock);
 345         } else {
 346                 spin_unlock_bh(&block->profile.lock);
 347                 rc = -EIO;
 348                 goto out;
 349         }
 350         if (copy_to_user(argp, data, sizeof(*data)))
 351                 rc = -EFAULT;
 352 out:
 353         kfree(data);
 354         return rc;
 355 }
 356 #else
 357 static int dasd_ioctl_reset_profile(struct dasd_block *block)
 358 {
 359         return -ENOTTY;
 360 }
 361
 362 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 363 {
 364         return -ENOTTY;
 365 }
 366 #endif
 367
 368 /*
 369  * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
 370  */
 371 static int dasd_ioctl_information(struct dasd_block *block,
 372                                   unsigned int cmd, void __user *argp)
 373 {
 374         struct dasd_information2_t *dasd_info;
 375         struct subchannel_id sch_id;
 376         struct ccw_dev_id dev_id;
 377         struct dasd_device *base;
 378         struct ccw_device *cdev;
 379         unsigned long flags;
 380         int rc;
 381
 382         base = block->base;
 383         if (!base->discipline || !base->discipline->fill_info)
 384                 return -EINVAL;
 385
 386         dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
 387         if (dasd_info == NULL)
 388                 return -ENOMEM;
 389
 390         rc = base->discipline->fill_info(base, dasd_info);
 391         if (rc) {
 392                 kfree(dasd_info);
 393                 return rc;
 394         }
 395
 396         cdev = base->cdev;
 397         ccw_device_get_id(cdev, &dev_id);
 398         ccw_device_get_schid(cdev, &sch_id);
 399
 400         dasd_info->devno = dev_id.devno;
 401         dasd_info->schid = sch_id.sch_no;
 402         dasd_info->cu_type = cdev->id.cu_type;
 403         dasd_info->cu_model = cdev->id.cu_model;
 404         dasd_info->dev_type = cdev->id.dev_type;
 405         dasd_info->dev_model = cdev->id.dev_model;
 406         dasd_info->status = base->state;
 407         /*
 408          * The open_count is increased for every opener, that includes
 409          * the blkdev_get in dasd_scan_partitions.
 410          * This must be hidden from user-space.
 411          */
 412         dasd_info->open_count = atomic_read(&block->open_count);
 413         if (!block->bdev)
 414                 dasd_info->open_count++;
 415
 416         /*
 417          * check if device is really formatted
 418          * LDL / CDL was returned by 'fill_info'
 419          */
 420         if ((base->state < DASD_STATE_READY) ||
 421             (dasd_check_blocksize(block->bp_block)))
 422                 dasd_info->format = DASD_FORMAT_NONE;
 423
 424         dasd_info->features |=
 425                 ((base->features & DASD_FEATURE_READONLY) != 0);
 426
 427         memcpy(dasd_info->type, base->discipline->name, 4);
 428
 429         if (block->request_queue->request_fn) {
 430                 struct list_head *l;
 431 #ifdef DASD_EXTENDED_PROFILING
 432                 {
 433                         struct list_head *l;
 434                         spin_lock_irqsave(&block->lock, flags);
 435                         list_for_each(l, &block->request_queue->queue_head)
 436                                 dasd_info->req_queue_len++;
 437                         spin_unlock_irqrestore(&block->lock, flags);
 438                 }
 439 #endif                          /* DASD_EXTENDED_PROFILING */
 440                 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 441                 list_for_each(l, &base->ccw_queue)
 442                         dasd_info->chanq_len++;
 443                 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
 444                                        flags);
 445         }
 446
 447         rc = 0;
 448         if (copy_to_user(argp, dasd_info,
 449                          ((cmd == (unsigned int) BIODASDINFO2) ?
 450                           sizeof(struct dasd_information2_t) :
 451                           sizeof(struct dasd_information_t))))
 452                 rc = -EFAULT;
 453         kfree(dasd_info);
 454         return rc;
 455 }
 456
 457 /*
 458  * Set read only
 459  */
 460 static int
 461 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 462 {
 463         struct dasd_device *base;
 464         int intval, rc;
 465
 466         if (!capable(CAP_SYS_ADMIN))
 467                 return -EACCES;
 468         if (bdev != bdev->bd_contains)
 469                 // ro setting is not allowed for partitions
 470                 return -EINVAL;
 471         if (get_user(intval, (int __user *)argp))
 472                 return -EFAULT;
 473         base = dasd_device_from_gendisk(bdev->bd_disk);
 474         if (!base)
 475                 return -ENODEV;
 476         if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
 477                 dasd_put_device(base);
 478                 return -EROFS;
 479         }
 480         set_disk_ro(bdev->bd_disk, intval);
 481         rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
 482         dasd_put_device(base);
 483         return rc;
 484 }
 485
 486 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
 487                                   struct cmbdata __user *argp)
 488 {
 489         size_t size = _IOC_SIZE(cmd);
 490         struct cmbdata data;
 491         int ret;
 492
 493         ret = cmf_readall(block->base->cdev, &data);
 494         if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
 495                 return -EFAULT;
 496         return ret;
 497 }
 498
 499 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 500                unsigned int cmd, unsigned long arg)
 501 {
 502         struct dasd_block *block;
 503         struct dasd_device *base;
 504         void __user *argp;
 505         int rc;
 506
 507         if (is_compat_task())
 508                 argp = compat_ptr(arg);
 509         else
 510                 argp = (void __user *)arg;
 511
 512         if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
 513                 PRINT_DEBUG("empty data ptr");
 514                 return -EINVAL;
 515         }
 516
 517         base = dasd_device_from_gendisk(bdev->bd_disk);
 518         if (!base)
 519                 return -ENODEV;
 520         block = base->block;
 521         rc = 0;
 522         switch (cmd) {
 523         case BIODASDDISABLE:
 524                 rc = dasd_ioctl_disable(bdev);
 525                 break;
 526         case BIODASDENABLE:
 527                 rc = dasd_ioctl_enable(bdev);
 528                 break;
 529         case BIODASDQUIESCE:
 530                 rc = dasd_ioctl_quiesce(block);
 531                 break;
 532         case BIODASDRESUME:
 533                 rc = dasd_ioctl_resume(block);
 534                 break;
 535         case BIODASDABORTIO:
 536                 rc = dasd_ioctl_abortio(block);
 537                 break;
 538         case BIODASDALLOWIO:
 539                 rc = dasd_ioctl_allowio(block);
 540                 break;
 541         case BIODASDFMT:
 542                 rc = dasd_ioctl_format(bdev, argp);
 543                 break;
 544         case BIODASDINFO:
 545                 rc = dasd_ioctl_information(block, cmd, argp);
 546                 break;
 547         case BIODASDINFO2:
 548                 rc = dasd_ioctl_information(block, cmd, argp);
 549                 break;
 550         case BIODASDPRRD:
 551                 rc = dasd_ioctl_read_profile(block, argp);
 552                 break;
 553         case BIODASDPRRST:
 554                 rc = dasd_ioctl_reset_profile(block);
 555                 break;
 556         case BLKROSET:
 557                 rc = dasd_ioctl_set_ro(bdev, argp);
 558                 break;
 559         case DASDAPIVER:
 560                 rc = dasd_ioctl_api_version(argp);
 561                 break;
 562         case BIODASDCMFENABLE:
 563                 rc = enable_cmf(base->cdev);
 564                 break;
 565         case BIODASDCMFDISABLE:
 566                 rc = disable_cmf(base->cdev);
 567                 break;
 568         case BIODASDREADALLCMB:
 569                 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
 570                 break;
 571         default:
 572                 /* if the discipline has an ioctl method try it. */
 573                 rc = -ENOTTY;
 574                 if (base->discipline->ioctl)
 575                         rc = base->discipline->ioctl(block, cmd, argp);
 576         }
 577         dasd_put_device(base);
 578         return rc;
 579 }