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  * performs formatting of _device_ according to _fdata_
 145  * Note: The discipline's format_function is assumed to deliver formatting
 146  * commands to format a single unit of the device. In terms of the ECKD
 147  * devices this means CCWs are generated to format a single track.
 148  */
 149 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata)
 150 {
 151         struct dasd_ccw_req *cqr;
 152         struct dasd_device *base;
 153         int rc;
 154
 155         base = block->base;
 156         if (base->discipline->format_device == NULL)
 157                 return -EPERM;
 158
 159         if (base->state != DASD_STATE_BASIC) {
 160                 pr_warning("%s: The DASD cannot be formatted while it is "
 161                            "enabled\n",  dev_name(&base->cdev->dev));
 162                 return -EBUSY;
 163         }
 164
 165         DBF_DEV_EVENT(DBF_NOTICE, base,
 166                       "formatting units %u to %u (%u B blocks) flags %u",
 167                       fdata->start_unit,
 168                       fdata->stop_unit, fdata->blksize, fdata->intensity);
 169
 170         /* Since dasdfmt keeps the device open after it was disabled,
 171          * there still exists an inode for this device.
 172          * We must update i_blkbits, otherwise we might get errors when
 173          * enabling the device later.
 174          */
 175         if (fdata->start_unit == 0) {
 176                 struct block_device *bdev = bdget_disk(block->gdp, 0);
 177                 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
 178                 bdput(bdev);
 179         }
 180
 181         while (fdata->start_unit <= fdata->stop_unit) {
 182                 cqr = base->discipline->format_device(base, fdata);
 183                 if (IS_ERR(cqr))
 184                         return PTR_ERR(cqr);
 185                 rc = dasd_sleep_on_interruptible(cqr);
 186                 dasd_sfree_request(cqr, cqr->memdev);
 187                 if (rc) {
 188                         if (rc != -ERESTARTSYS)
 189                                 pr_err("%s: Formatting unit %d failed with "
 190                                        "rc=%d\n", dev_name(&base->cdev->dev),
 191                                        fdata->start_unit, rc);
 192                         return rc;
 193                 }
 194                 fdata->start_unit++;
 195         }
 196         return 0;
 197 }
 198
 199 /*
 200  * Format device.
 201  */
 202 static int
 203 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
 204 {
 205         struct dasd_device *base;
 206         struct format_data_t fdata;
 207         int rc;
 208
 209         if (!capable(CAP_SYS_ADMIN))
 210                 return -EACCES;
 211         if (!argp)
 212                 return -EINVAL;
 213         base = dasd_device_from_gendisk(bdev->bd_disk);
 214         if (!base)
 215                 return -ENODEV;
 216         if (base->features & DASD_FEATURE_READONLY ||
 217             test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
 218                 dasd_put_device(base);
 219                 return -EROFS;
 220         }
 221         if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
 222                 dasd_put_device(base);
 223                 return -EFAULT;
 224         }
 225         if (bdev != bdev->bd_contains) {
 226                 pr_warning("%s: The specified DASD is a partition and cannot "
 227                            "be formatted\n",
 228                            dev_name(&base->cdev->dev));
 229                 dasd_put_device(base);
 230                 return -EINVAL;
 231         }
 232         rc = dasd_format(base->block, &fdata);
 233         dasd_put_device(base);
 234         return rc;
 235 }
 236
 237 #ifdef CONFIG_DASD_PROFILE
 238 /*
 239  * Reset device profile information
 240  */
 241 static int dasd_ioctl_reset_profile(struct dasd_block *block)
 242 {
 243         dasd_profile_reset(&block->profile);
 244         return 0;
 245 }
 246
 247 /*
 248  * Return device profile information
 249  */
 250 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 251 {
 252         struct dasd_profile_info_t *data;
 253         int rc = 0;
 254
 255         data = kmalloc(sizeof(*data), GFP_KERNEL);
 256         if (!data)
 257                 return -ENOMEM;
 258
 259         spin_lock_bh(&block->profile.lock);
 260         if (block->profile.data) {
 261                 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
 262                 data->dasd_io_sects = block->profile.data->dasd_io_sects;
 263                 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
 264                        sizeof(data->dasd_io_secs));
 265                 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
 266                        sizeof(data->dasd_io_times));
 267                 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
 268                        sizeof(data->dasd_io_timps));
 269                 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
 270                        sizeof(data->dasd_io_time1));
 271                 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
 272                        sizeof(data->dasd_io_time2));
 273                 memcpy(data->dasd_io_time2ps,
 274                        block->profile.data->dasd_io_time2ps,
 275                        sizeof(data->dasd_io_time2ps));
 276                 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
 277                        sizeof(data->dasd_io_time3));
 278                 memcpy(data->dasd_io_nr_req,
 279                        block->profile.data->dasd_io_nr_req,
 280                        sizeof(data->dasd_io_nr_req));
 281                 spin_unlock_bh(&block->profile.lock);
 282         } else {
 283                 spin_unlock_bh(&block->profile.lock);
 284                 rc = -EIO;
 285                 goto out;
 286         }
 287         if (copy_to_user(argp, data, sizeof(*data)))
 288                 rc = -EFAULT;
 289 out:
 290         kfree(data);
 291         return rc;
 292 }
 293 #else
 294 static int dasd_ioctl_reset_profile(struct dasd_block *block)
 295 {
 296         return -ENOTTY;
 297 }
 298
 299 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 300 {
 301         return -ENOTTY;
 302 }
 303 #endif
 304
 305 /*
 306  * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
 307  */
 308 static int dasd_ioctl_information(struct dasd_block *block,
 309                                   unsigned int cmd, void __user *argp)
 310 {
 311         struct dasd_information2_t *dasd_info;
 312         struct subchannel_id sch_id;
 313         struct ccw_dev_id dev_id;
 314         struct dasd_device *base;
 315         struct ccw_device *cdev;
 316         unsigned long flags;
 317         int rc;
 318
 319         base = block->base;
 320         if (!base->discipline || !base->discipline->fill_info)
 321                 return -EINVAL;
 322
 323         dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
 324         if (dasd_info == NULL)
 325                 return -ENOMEM;
 326
 327         rc = base->discipline->fill_info(base, dasd_info);
 328         if (rc) {
 329                 kfree(dasd_info);
 330                 return rc;
 331         }
 332
 333         cdev = base->cdev;
 334         ccw_device_get_id(cdev, &dev_id);
 335         ccw_device_get_schid(cdev, &sch_id);
 336
 337         dasd_info->devno = dev_id.devno;
 338         dasd_info->schid = sch_id.sch_no;
 339         dasd_info->cu_type = cdev->id.cu_type;
 340         dasd_info->cu_model = cdev->id.cu_model;
 341         dasd_info->dev_type = cdev->id.dev_type;
 342         dasd_info->dev_model = cdev->id.dev_model;
 343         dasd_info->status = base->state;
 344         /*
 345          * The open_count is increased for every opener, that includes
 346          * the blkdev_get in dasd_scan_partitions.
 347          * This must be hidden from user-space.
 348          */
 349         dasd_info->open_count = atomic_read(&block->open_count);
 350         if (!block->bdev)
 351                 dasd_info->open_count++;
 352
 353         /*
 354          * check if device is really formatted
 355          * LDL / CDL was returned by 'fill_info'
 356          */
 357         if ((base->state < DASD_STATE_READY) ||
 358             (dasd_check_blocksize(block->bp_block)))
 359                 dasd_info->format = DASD_FORMAT_NONE;
 360
 361         dasd_info->features |=
 362                 ((base->features & DASD_FEATURE_READONLY) != 0);
 363
 364         memcpy(dasd_info->type, base->discipline->name, 4);
 365
 366         if (block->request_queue->request_fn) {
 367                 struct list_head *l;
 368 #ifdef DASD_EXTENDED_PROFILING
 369                 {
 370                         struct list_head *l;
 371                         spin_lock_irqsave(&block->lock, flags);
 372                         list_for_each(l, &block->request_queue->queue_head)
 373                                 dasd_info->req_queue_len++;
 374                         spin_unlock_irqrestore(&block->lock, flags);
 375                 }
 376 #endif                          /* DASD_EXTENDED_PROFILING */
 377                 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 378                 list_for_each(l, &base->ccw_queue)
 379                         dasd_info->chanq_len++;
 380                 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
 381                                        flags);
 382         }
 383
 384         rc = 0;
 385         if (copy_to_user(argp, dasd_info,
 386                          ((cmd == (unsigned int) BIODASDINFO2) ?
 387                           sizeof(struct dasd_information2_t) :
 388                           sizeof(struct dasd_information_t))))
 389                 rc = -EFAULT;
 390         kfree(dasd_info);
 391         return rc;
 392 }
 393
 394 /*
 395  * Set read only
 396  */
 397 static int
 398 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 399 {
 400         struct dasd_device *base;
 401         int intval, rc;
 402
 403         if (!capable(CAP_SYS_ADMIN))
 404                 return -EACCES;
 405         if (bdev != bdev->bd_contains)
 406                 // ro setting is not allowed for partitions
 407                 return -EINVAL;
 408         if (get_user(intval, (int __user *)argp))
 409                 return -EFAULT;
 410         base = dasd_device_from_gendisk(bdev->bd_disk);
 411         if (!base)
 412                 return -ENODEV;
 413         if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
 414                 dasd_put_device(base);
 415                 return -EROFS;
 416         }
 417         set_disk_ro(bdev->bd_disk, intval);
 418         rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
 419         dasd_put_device(base);
 420         return rc;
 421 }
 422
 423 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
 424                                   struct cmbdata __user *argp)
 425 {
 426         size_t size = _IOC_SIZE(cmd);
 427         struct cmbdata data;
 428         int ret;
 429
 430         ret = cmf_readall(block->base->cdev, &data);
 431         if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
 432                 return -EFAULT;
 433         return ret;
 434 }
 435
 436 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 437                unsigned int cmd, unsigned long arg)
 438 {
 439         struct dasd_block *block;
 440         struct dasd_device *base;
 441         void __user *argp;
 442         int rc;
 443
 444         if (is_compat_task())
 445                 argp = compat_ptr(arg);
 446         else
 447                 argp = (void __user *)arg;
 448
 449         if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
 450                 PRINT_DEBUG("empty data ptr");
 451                 return -EINVAL;
 452         }
 453
 454         base = dasd_device_from_gendisk(bdev->bd_disk);
 455         if (!base)
 456                 return -ENODEV;
 457         block = base->block;
 458         rc = 0;
 459         switch (cmd) {
 460         case BIODASDDISABLE:
 461                 rc = dasd_ioctl_disable(bdev);
 462                 break;
 463         case BIODASDENABLE:
 464                 rc = dasd_ioctl_enable(bdev);
 465                 break;
 466         case BIODASDQUIESCE:
 467                 rc = dasd_ioctl_quiesce(block);
 468                 break;
 469         case BIODASDRESUME:
 470                 rc = dasd_ioctl_resume(block);
 471                 break;
 472         case BIODASDFMT:
 473                 rc = dasd_ioctl_format(bdev, argp);
 474                 break;
 475         case BIODASDINFO:
 476                 rc = dasd_ioctl_information(block, cmd, argp);
 477                 break;
 478         case BIODASDINFO2:
 479                 rc = dasd_ioctl_information(block, cmd, argp);
 480                 break;
 481         case BIODASDPRRD:
 482                 rc = dasd_ioctl_read_profile(block, argp);
 483                 break;
 484         case BIODASDPRRST:
 485                 rc = dasd_ioctl_reset_profile(block);
 486                 break;
 487         case BLKROSET:
 488                 rc = dasd_ioctl_set_ro(bdev, argp);
 489                 break;
 490         case DASDAPIVER:
 491                 rc = dasd_ioctl_api_version(argp);
 492                 break;
 493         case BIODASDCMFENABLE:
 494                 rc = enable_cmf(base->cdev);
 495                 break;
 496         case BIODASDCMFDISABLE:
 497                 rc = disable_cmf(base->cdev);
 498                 break;
 499         case BIODASDREADALLCMB:
 500                 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
 501                 break;
 502         default:
 503                 /* if the discipline has an ioctl method try it. */
 504                 rc = -ENOTTY;
 505                 if (base->discipline->ioctl)
 506                         rc = base->discipline->ioctl(block, cmd, argp);
 507         }
 508         dasd_put_device(base);
 509         return rc;
 510 }