drivers/s390/block/dasd_ioctl.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_ioctl.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
   9  *
  10  * i/o controls for the dasd driver.
  11  */
  12
  13 #define KMSG_COMPONENT "dasd"
  14
  15 #include <linux/interrupt.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/cmb.h>
  23 #include <asm/uaccess.h>
  24
  25 /* This is ugly... */
  26 #define PRINTK_HEADER "dasd_ioctl:"
  27
  28 #include "dasd_int.h"
  29
  30
  31 static int
  32 dasd_ioctl_api_version(void __user *argp)
  33 {
  34         int ver = DASD_API_VERSION;
  35         return put_user(ver, (int __user *)argp);
  36 }
  37
  38 /*
  39  * Enable device.
  40  * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
  41  */
  42 static int
  43 dasd_ioctl_enable(struct block_device *bdev)
  44 {
  45         struct dasd_device *base;
  46
  47         if (!capable(CAP_SYS_ADMIN))
  48                 return -EACCES;
  49
  50         base = dasd_device_from_gendisk(bdev->bd_disk);
  51         if (!base)
  52                 return -ENODEV;
  53
  54         dasd_enable_device(base);
  55         /* Formatting the dasd device can change the capacity. */
  56         mutex_lock(&bdev->bd_mutex);
  57         i_size_write(bdev->bd_inode,
  58                      (loff_t)get_capacity(base->block->gdp) << 9);
  59         mutex_unlock(&bdev->bd_mutex);
  60         dasd_put_device(base);
  61         return 0;
  62 }
  63
  64 /*
  65  * Disable device.
  66  * Used by dasdfmt. Disable I/O operations but allow ioctls.
  67  */
  68 static int
  69 dasd_ioctl_disable(struct block_device *bdev)
  70 {
  71         struct dasd_device *base;
  72
  73         if (!capable(CAP_SYS_ADMIN))
  74                 return -EACCES;
  75
  76         base = dasd_device_from_gendisk(bdev->bd_disk);
  77         if (!base)
  78                 return -ENODEV;
  79         /*
  80          * Man this is sick. We don't do a real disable but only downgrade
  81          * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
  82          * BIODASDDISABLE to disable accesses to the device via the block
  83          * device layer but it still wants to do i/o on the device by
  84          * using the BIODASDFMT ioctl. Therefore the correct state for the
  85          * device is DASD_STATE_BASIC that allows to do basic i/o.
  86          */
  87         dasd_set_target_state(base, DASD_STATE_BASIC);
  88         /*
  89          * Set i_size to zero, since read, write, etc. check against this
  90          * value.
  91          */
  92         mutex_lock(&bdev->bd_mutex);
  93         i_size_write(bdev->bd_inode, 0);
  94         mutex_unlock(&bdev->bd_mutex);
  95         dasd_put_device(base);
  96         return 0;
  97 }
  98
  99 /*
 100  * Quiesce device.
 101  */
 102 static int dasd_ioctl_quiesce(struct dasd_block *block)
 103 {
 104         unsigned long flags;
 105         struct dasd_device *base;
 106
 107         base = block->base;
 108         if (!capable (CAP_SYS_ADMIN))
 109                 return -EACCES;
 110
 111         pr_info("%s: The DASD has been put in the quiesce "
 112                 "state\n", dev_name(&base->cdev->dev));
 113         spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 114         dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
 115         spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
 116         return 0;
 117 }
 118
 119
 120 /*
 121  * Resume device.
 122  */
 123 static int dasd_ioctl_resume(struct dasd_block *block)
 124 {
 125         unsigned long flags;
 126         struct dasd_device *base;
 127
 128         base = block->base;
 129         if (!capable (CAP_SYS_ADMIN))
 130                 return -EACCES;
 131
 132         pr_info("%s: I/O operations have been resumed "
 133                 "on the DASD\n", dev_name(&base->cdev->dev));
 134         spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 135         dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
 136         spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
 137
 138         dasd_schedule_block_bh(block);
 139         return 0;
 140 }
 141
 142 /*
 143  * performs formatting of _device_ according to _fdata_
 144  * Note: The discipline's format_function is assumed to deliver formatting
 145  * commands to format a single unit of the device. In terms of the ECKD
 146  * devices this means CCWs are generated to format a single track.
 147  */
 148 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata)
 149 {
 150         struct dasd_ccw_req *cqr;
 151         struct dasd_device *base;
 152         int rc;
 153
 154         base = block->base;
 155         if (base->discipline->format_device == NULL)
 156                 return -EPERM;
 157
 158         if (base->state != DASD_STATE_BASIC) {
 159                 pr_warning("%s: The DASD cannot be formatted while it is "
 160                            "enabled\n",  dev_name(&base->cdev->dev));
 161                 return -EBUSY;
 162         }
 163
 164         DBF_DEV_EVENT(DBF_NOTICE, base,
 165                       "formatting units %u to %u (%u B blocks) flags %u",
 166                       fdata->start_unit,
 167                       fdata->stop_unit, fdata->blksize, fdata->intensity);
 168
 169         /* Since dasdfmt keeps the device open after it was disabled,
 170          * there still exists an inode for this device.
 171          * We must update i_blkbits, otherwise we might get errors when
 172          * enabling the device later.
 173          */
 174         if (fdata->start_unit == 0) {
 175                 struct block_device *bdev = bdget_disk(block->gdp, 0);
 176                 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
 177                 bdput(bdev);
 178         }
 179
 180         while (fdata->start_unit <= fdata->stop_unit) {
 181                 cqr = base->discipline->format_device(base, fdata);
 182                 if (IS_ERR(cqr))
 183                         return PTR_ERR(cqr);
 184                 rc = dasd_sleep_on_interruptible(cqr);
 185                 dasd_sfree_request(cqr, cqr->memdev);
 186                 if (rc) {
 187                         if (rc != -ERESTARTSYS)
 188                                 pr_err("%s: Formatting unit %d failed with "
 189                                        "rc=%d\n", dev_name(&base->cdev->dev),
 190                                        fdata->start_unit, rc);
 191                         return rc;
 192                 }
 193                 fdata->start_unit++;
 194         }
 195         return 0;
 196 }
 197
 198 /*
 199  * Format device.
 200  */
 201 static int
 202 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
 203 {
 204         struct dasd_device *base;
 205         struct format_data_t fdata;
 206         int rc;
 207
 208         if (!capable(CAP_SYS_ADMIN))
 209                 return -EACCES;
 210         if (!argp)
 211                 return -EINVAL;
 212         base = dasd_device_from_gendisk(bdev->bd_disk);
 213         if (!base)
 214                 return -ENODEV;
 215         if (base->features & DASD_FEATURE_READONLY ||
 216             test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
 217                 dasd_put_device(base);
 218                 return -EROFS;
 219         }
 220         if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
 221                 dasd_put_device(base);
 222                 return -EFAULT;
 223         }
 224         if (bdev != bdev->bd_contains) {
 225                 pr_warning("%s: The specified DASD is a partition and cannot "
 226                            "be formatted\n",
 227                            dev_name(&base->cdev->dev));
 228                 dasd_put_device(base);
 229                 return -EINVAL;
 230         }
 231         rc = dasd_format(base->block, &fdata);
 232         dasd_put_device(base);
 233         return rc;
 234 }
 235
 236 #ifdef CONFIG_DASD_PROFILE
 237 /*
 238  * Reset device profile information
 239  */
 240 static int dasd_ioctl_reset_profile(struct dasd_block *block)
 241 {
 242         dasd_profile_reset(&block->profile);
 243         return 0;
 244 }
 245
 246 /*
 247  * Return device profile information
 248  */
 249 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 250 {
 251         struct dasd_profile_info_t *data;
 252         int rc = 0;
 253
 254         data = kmalloc(sizeof(*data), GFP_KERNEL);
 255         if (!data)
 256                 return -ENOMEM;
 257
 258         spin_lock_bh(&block->profile.lock);
 259         if (block->profile.data) {
 260                 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
 261                 data->dasd_io_sects = block->profile.data->dasd_io_sects;
 262                 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
 263                        sizeof(data->dasd_io_secs));
 264                 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
 265                        sizeof(data->dasd_io_times));
 266                 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
 267                        sizeof(data->dasd_io_timps));
 268                 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
 269                        sizeof(data->dasd_io_time1));
 270                 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
 271                        sizeof(data->dasd_io_time2));
 272                 memcpy(data->dasd_io_time2ps,
 273                        block->profile.data->dasd_io_time2ps,
 274                        sizeof(data->dasd_io_time2ps));
 275                 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
 276                        sizeof(data->dasd_io_time3));
 277                 memcpy(data->dasd_io_nr_req,
 278                        block->profile.data->dasd_io_nr_req,
 279                        sizeof(data->dasd_io_nr_req));
 280                 spin_unlock_bh(&block->profile.lock);
 281         } else {
 282                 spin_unlock_bh(&block->profile.lock);
 283                 rc = -EIO;
 284                 goto out;
 285         }
 286         if (copy_to_user(argp, data, sizeof(*data)))
 287                 rc = -EFAULT;
 288 out:
 289         kfree(data);
 290         return rc;
 291 }
 292 #else
 293 static int dasd_ioctl_reset_profile(struct dasd_block *block)
 294 {
 295         return -ENOSYS;
 296 }
 297
 298 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 299 {
 300         return -ENOSYS;
 301 }
 302 #endif
 303
 304 /*
 305  * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
 306  */
 307 static int dasd_ioctl_information(struct dasd_block *block,
 308                                   unsigned int cmd, void __user *argp)
 309 {
 310         struct dasd_information2_t *dasd_info;
 311         unsigned long flags;
 312         int rc;
 313         struct dasd_device *base;
 314         struct ccw_device *cdev;
 315         struct ccw_dev_id dev_id;
 316
 317         base = block->base;
 318         if (!base->discipline || !base->discipline->fill_info)
 319                 return -EINVAL;
 320
 321         dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
 322         if (dasd_info == NULL)
 323                 return -ENOMEM;
 324
 325         rc = base->discipline->fill_info(base, dasd_info);
 326         if (rc) {
 327                 kfree(dasd_info);
 328                 return rc;
 329         }
 330
 331         cdev = base->cdev;
 332         ccw_device_get_id(cdev, &dev_id);
 333
 334         dasd_info->devno = dev_id.devno;
 335         dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev);
 336         dasd_info->cu_type = cdev->id.cu_type;
 337         dasd_info->cu_model = cdev->id.cu_model;
 338         dasd_info->dev_type = cdev->id.dev_type;
 339         dasd_info->dev_model = cdev->id.dev_model;
 340         dasd_info->status = base->state;
 341         /*
 342          * The open_count is increased for every opener, that includes
 343          * the blkdev_get in dasd_scan_partitions.
 344          * This must be hidden from user-space.
 345          */
 346         dasd_info->open_count = atomic_read(&block->open_count);
 347         if (!block->bdev)
 348                 dasd_info->open_count++;
 349
 350         /*
 351          * check if device is really formatted
 352          * LDL / CDL was returned by 'fill_info'
 353          */
 354         if ((base->state < DASD_STATE_READY) ||
 355             (dasd_check_blocksize(block->bp_block)))
 356                 dasd_info->format = DASD_FORMAT_NONE;
 357
 358         dasd_info->features |=
 359                 ((base->features & DASD_FEATURE_READONLY) != 0);
 360
 361         memcpy(dasd_info->type, base->discipline->name, 4);
 362
 363         if (block->request_queue->request_fn) {
 364                 struct list_head *l;
 365 #ifdef DASD_EXTENDED_PROFILING
 366                 {
 367                         struct list_head *l;
 368                         spin_lock_irqsave(&block->lock, flags);
 369                         list_for_each(l, &block->request_queue->queue_head)
 370                                 dasd_info->req_queue_len++;
 371                         spin_unlock_irqrestore(&block->lock, flags);
 372                 }
 373 #endif                          /* DASD_EXTENDED_PROFILING */
 374                 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
 375                 list_for_each(l, &base->ccw_queue)
 376                         dasd_info->chanq_len++;
 377                 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
 378                                        flags);
 379         }
 380
 381         rc = 0;
 382         if (copy_to_user(argp, dasd_info,
 383                          ((cmd == (unsigned int) BIODASDINFO2) ?
 384                           sizeof(struct dasd_information2_t) :
 385                           sizeof(struct dasd_information_t))))
 386                 rc = -EFAULT;
 387         kfree(dasd_info);
 388         return rc;
 389 }
 390
 391 /*
 392  * Set read only
 393  */
 394 static int
 395 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 396 {
 397         struct dasd_device *base;
 398         int intval, rc;
 399
 400         if (!capable(CAP_SYS_ADMIN))
 401                 return -EACCES;
 402         if (bdev != bdev->bd_contains)
 403                 // ro setting is not allowed for partitions
 404                 return -EINVAL;
 405         if (get_user(intval, (int __user *)argp))
 406                 return -EFAULT;
 407         base = dasd_device_from_gendisk(bdev->bd_disk);
 408         if (!base)
 409                 return -ENODEV;
 410         if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
 411                 dasd_put_device(base);
 412                 return -EROFS;
 413         }
 414         set_disk_ro(bdev->bd_disk, intval);
 415         rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
 416         dasd_put_device(base);
 417         return rc;
 418 }
 419
 420 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
 421                                   struct cmbdata __user *argp)
 422 {
 423         size_t size = _IOC_SIZE(cmd);
 424         struct cmbdata data;
 425         int ret;
 426
 427         ret = cmf_readall(block->base->cdev, &data);
 428         if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
 429                 return -EFAULT;
 430         return ret;
 431 }
 432
 433 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 434                unsigned int cmd, unsigned long arg)
 435 {
 436         struct dasd_block *block;
 437         struct dasd_device *base;
 438         void __user *argp;
 439         int rc;
 440
 441         if (is_compat_task())
 442                 argp = compat_ptr(arg);
 443         else
 444                 argp = (void __user *)arg;
 445
 446         if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
 447                 PRINT_DEBUG("empty data ptr");
 448                 return -EINVAL;
 449         }
 450
 451         base = dasd_device_from_gendisk(bdev->bd_disk);
 452         if (!base)
 453                 return -ENODEV;
 454         block = base->block;
 455         rc = 0;
 456         switch (cmd) {
 457         case BIODASDDISABLE:
 458                 rc = dasd_ioctl_disable(bdev);
 459                 break;
 460         case BIODASDENABLE:
 461                 rc = dasd_ioctl_enable(bdev);
 462                 break;
 463         case BIODASDQUIESCE:
 464                 rc = dasd_ioctl_quiesce(block);
 465                 break;
 466         case BIODASDRESUME:
 467                 rc = dasd_ioctl_resume(block);
 468                 break;
 469         case BIODASDFMT:
 470                 rc = dasd_ioctl_format(bdev, argp);
 471                 break;
 472         case BIODASDINFO:
 473                 rc = dasd_ioctl_information(block, cmd, argp);
 474                 break;
 475         case BIODASDINFO2:
 476                 rc = dasd_ioctl_information(block, cmd, argp);
 477                 break;
 478         case BIODASDPRRD:
 479                 rc = dasd_ioctl_read_profile(block, argp);
 480                 break;
 481         case BIODASDPRRST:
 482                 rc = dasd_ioctl_reset_profile(block);
 483                 break;
 484         case BLKROSET:
 485                 rc = dasd_ioctl_set_ro(bdev, argp);
 486                 break;
 487         case DASDAPIVER:
 488                 rc = dasd_ioctl_api_version(argp);
 489                 break;
 490         case BIODASDCMFENABLE:
 491                 rc = enable_cmf(base->cdev);
 492                 break;
 493         case BIODASDCMFDISABLE:
 494                 rc = disable_cmf(base->cdev);
 495                 break;
 496         case BIODASDREADALLCMB:
 497                 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
 498                 break;
 499         default:
 500                 /* if the discipline has an ioctl method try it. */
 501                 if (base->discipline->ioctl) {
 502                         rc = base->discipline->ioctl(block, cmd, argp);
 503                         if (rc == -ENOIOCTLCMD)
 504                                 rc = -EINVAL;
 505                 } else
 506                         rc = -EINVAL;
 507         }
 508         dasd_put_device(base);
 509         return rc;
 510 }