1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 * Copyright IBM Corp. 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/compat.h> 17 #include <linux/major.h> 18 #include <linux/fs.h> 19 #include <linux/blkpg.h> 20 #include <linux/slab.h> 21 #include <asm/ccwdev.h> 22 #include <asm/schid.h> 23 #include <asm/cmb.h> 24 #include <linux/uaccess.h> 25 #include <linux/dasd_mod.h> 26 27 /* This is ugly... */ 28 #define PRINTK_HEADER "dasd_ioctl:" 29 30 #include "dasd_int.h" 31 32 33 static int 34 dasd_ioctl_api_version(void __user *argp) 35 { 36 int ver = DASD_API_VERSION; 37 return put_user(ver, (int __user *)argp); 38 } 39 40 /* 41 * Enable device. 42 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection 43 */ 44 static int 45 dasd_ioctl_enable(struct block_device *bdev) 46 { 47 struct dasd_device *base; 48 49 if (!capable(CAP_SYS_ADMIN)) 50 return -EACCES; 51 52 base = dasd_device_from_gendisk(bdev->bd_disk); 53 if (!base) 54 return -ENODEV; 55 56 dasd_enable_device(base); 57 /* Formatting the dasd device can change the capacity. */ 58 bd_set_nr_sectors(bdev, get_capacity(base->block->gdp)); 59 dasd_put_device(base); 60 return 0; 61 } 62 63 /* 64 * Disable device. 65 * Used by dasdfmt. Disable I/O operations but allow ioctls. 66 */ 67 static int 68 dasd_ioctl_disable(struct block_device *bdev) 69 { 70 struct dasd_device *base; 71 72 if (!capable(CAP_SYS_ADMIN)) 73 return -EACCES; 74 75 base = dasd_device_from_gendisk(bdev->bd_disk); 76 if (!base) 77 return -ENODEV; 78 /* 79 * Man this is sick. We don't do a real disable but only downgrade 80 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses 81 * BIODASDDISABLE to disable accesses to the device via the block 82 * device layer but it still wants to do i/o on the device by 83 * using the BIODASDFMT ioctl. Therefore the correct state for the 84 * device is DASD_STATE_BASIC that allows to do basic i/o. 85 */ 86 dasd_set_target_state(base, DASD_STATE_BASIC); 87 /* 88 * Set i_size to zero, since read, write, etc. check against this 89 * value. 90 */ 91 bd_set_nr_sectors(bdev, 0); 92 dasd_put_device(base); 93 return 0; 94 } 95 96 /* 97 * Quiesce device. 98 */ 99 static int dasd_ioctl_quiesce(struct dasd_block *block) 100 { 101 unsigned long flags; 102 struct dasd_device *base; 103 104 base = block->base; 105 if (!capable (CAP_SYS_ADMIN)) 106 return -EACCES; 107 108 pr_info("%s: The DASD has been put in the quiesce " 109 "state\n", dev_name(&base->cdev->dev)); 110 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 111 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 112 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 113 return 0; 114 } 115 116 117 /* 118 * Resume device. 119 */ 120 static int dasd_ioctl_resume(struct dasd_block *block) 121 { 122 unsigned long flags; 123 struct dasd_device *base; 124 125 base = block->base; 126 if (!capable (CAP_SYS_ADMIN)) 127 return -EACCES; 128 129 pr_info("%s: I/O operations have been resumed " 130 "on the DASD\n", dev_name(&base->cdev->dev)); 131 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 132 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); 133 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 134 135 dasd_schedule_block_bh(block); 136 return 0; 137 } 138 139 /* 140 * Abort all failfast I/O on a device. 141 */ 142 static int dasd_ioctl_abortio(struct dasd_block *block) 143 { 144 unsigned long flags; 145 struct dasd_device *base; 146 struct dasd_ccw_req *cqr, *n; 147 148 base = block->base; 149 if (!capable(CAP_SYS_ADMIN)) 150 return -EACCES; 151 152 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags)) 153 return 0; 154 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set"); 155 156 spin_lock_irqsave(&block->request_queue_lock, flags); 157 spin_lock(&block->queue_lock); 158 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) { 159 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && 160 cqr->callback_data && 161 cqr->callback_data != DASD_SLEEPON_START_TAG && 162 cqr->callback_data != DASD_SLEEPON_END_TAG) { 163 spin_unlock(&block->queue_lock); 164 blk_abort_request(cqr->callback_data); 165 spin_lock(&block->queue_lock); 166 } 167 } 168 spin_unlock(&block->queue_lock); 169 spin_unlock_irqrestore(&block->request_queue_lock, flags); 170 171 dasd_schedule_block_bh(block); 172 return 0; 173 } 174 175 /* 176 * Allow I/O on a device 177 */ 178 static int dasd_ioctl_allowio(struct dasd_block *block) 179 { 180 struct dasd_device *base; 181 182 base = block->base; 183 if (!capable(CAP_SYS_ADMIN)) 184 return -EACCES; 185 186 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags)) 187 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset"); 188 189 return 0; 190 } 191 192 /* 193 * performs formatting of _device_ according to _fdata_ 194 * Note: The discipline's format_function is assumed to deliver formatting 195 * commands to format multiple units of the device. In terms of the ECKD 196 * devices this means CCWs are generated to format multiple tracks. 197 */ 198 static int 199 dasd_format(struct dasd_block *block, struct format_data_t *fdata) 200 { 201 struct dasd_device *base; 202 int rc; 203 204 base = block->base; 205 if (base->discipline->format_device == NULL) 206 return -EPERM; 207 208 if (base->state != DASD_STATE_BASIC) { 209 pr_warn("%s: The DASD cannot be formatted while it is enabled\n", 210 dev_name(&base->cdev->dev)); 211 return -EBUSY; 212 } 213 214 DBF_DEV_EVENT(DBF_NOTICE, base, 215 "formatting units %u to %u (%u B blocks) flags %u", 216 fdata->start_unit, 217 fdata->stop_unit, fdata->blksize, fdata->intensity); 218 219 /* Since dasdfmt keeps the device open after it was disabled, 220 * there still exists an inode for this device. 221 * We must update i_blkbits, otherwise we might get errors when 222 * enabling the device later. 223 */ 224 if (fdata->start_unit == 0) { 225 struct block_device *bdev = bdget_disk(block->gdp, 0); 226 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 227 bdput(bdev); 228 } 229 230 rc = base->discipline->format_device(base, fdata, 1); 231 if (rc == -EAGAIN) 232 rc = base->discipline->format_device(base, fdata, 0); 233 234 return rc; 235 } 236 237 static int dasd_check_format(struct dasd_block *block, 238 struct format_check_t *cdata) 239 { 240 struct dasd_device *base; 241 int rc; 242 243 base = block->base; 244 if (!base->discipline->check_device_format) 245 return -ENOTTY; 246 247 rc = base->discipline->check_device_format(base, cdata, 1); 248 if (rc == -EAGAIN) 249 rc = base->discipline->check_device_format(base, cdata, 0); 250 251 return rc; 252 } 253 254 /* 255 * Format device. 256 */ 257 static int 258 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 259 { 260 struct dasd_device *base; 261 struct format_data_t fdata; 262 int rc; 263 264 if (!capable(CAP_SYS_ADMIN)) 265 return -EACCES; 266 if (!argp) 267 return -EINVAL; 268 base = dasd_device_from_gendisk(bdev->bd_disk); 269 if (!base) 270 return -ENODEV; 271 if (base->features & DASD_FEATURE_READONLY || 272 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 273 dasd_put_device(base); 274 return -EROFS; 275 } 276 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { 277 dasd_put_device(base); 278 return -EFAULT; 279 } 280 if (bdev_is_partition(bdev)) { 281 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n", 282 dev_name(&base->cdev->dev)); 283 dasd_put_device(base); 284 return -EINVAL; 285 } 286 rc = dasd_format(base->block, &fdata); 287 dasd_put_device(base); 288 289 return rc; 290 } 291 292 /* 293 * Check device format 294 */ 295 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp) 296 { 297 struct format_check_t cdata; 298 struct dasd_device *base; 299 int rc = 0; 300 301 if (!argp) 302 return -EINVAL; 303 304 base = dasd_device_from_gendisk(bdev->bd_disk); 305 if (!base) 306 return -ENODEV; 307 if (bdev_is_partition(bdev)) { 308 pr_warn("%s: The specified DASD is a partition and cannot be checked\n", 309 dev_name(&base->cdev->dev)); 310 rc = -EINVAL; 311 goto out_err; 312 } 313 314 if (copy_from_user(&cdata, argp, sizeof(cdata))) { 315 rc = -EFAULT; 316 goto out_err; 317 } 318 319 rc = dasd_check_format(base->block, &cdata); 320 if (rc) 321 goto out_err; 322 323 if (copy_to_user(argp, &cdata, sizeof(cdata))) 324 rc = -EFAULT; 325 326 out_err: 327 dasd_put_device(base); 328 329 return rc; 330 } 331 332 static int dasd_release_space(struct dasd_device *device, 333 struct format_data_t *rdata) 334 { 335 if (!device->discipline->is_ese && !device->discipline->is_ese(device)) 336 return -ENOTSUPP; 337 if (!device->discipline->release_space) 338 return -ENOTSUPP; 339 340 return device->discipline->release_space(device, rdata); 341 } 342 343 /* 344 * Release allocated space 345 */ 346 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp) 347 { 348 struct format_data_t rdata; 349 struct dasd_device *base; 350 int rc = 0; 351 352 if (!capable(CAP_SYS_ADMIN)) 353 return -EACCES; 354 if (!argp) 355 return -EINVAL; 356 357 base = dasd_device_from_gendisk(bdev->bd_disk); 358 if (!base) 359 return -ENODEV; 360 if (base->features & DASD_FEATURE_READONLY || 361 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 362 rc = -EROFS; 363 goto out_err; 364 } 365 if (bdev_is_partition(bdev)) { 366 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n", 367 dev_name(&base->cdev->dev)); 368 rc = -EINVAL; 369 goto out_err; 370 } 371 372 if (copy_from_user(&rdata, argp, sizeof(rdata))) { 373 rc = -EFAULT; 374 goto out_err; 375 } 376 377 rc = dasd_release_space(base, &rdata); 378 379 out_err: 380 dasd_put_device(base); 381 382 return rc; 383 } 384 385 #ifdef CONFIG_DASD_PROFILE 386 /* 387 * Reset device profile information 388 */ 389 static int dasd_ioctl_reset_profile(struct dasd_block *block) 390 { 391 dasd_profile_reset(&block->profile); 392 return 0; 393 } 394 395 /* 396 * Return device profile information 397 */ 398 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 399 { 400 struct dasd_profile_info_t *data; 401 int rc = 0; 402 403 data = kmalloc(sizeof(*data), GFP_KERNEL); 404 if (!data) 405 return -ENOMEM; 406 407 spin_lock_bh(&block->profile.lock); 408 if (block->profile.data) { 409 data->dasd_io_reqs = block->profile.data->dasd_io_reqs; 410 data->dasd_io_sects = block->profile.data->dasd_io_sects; 411 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, 412 sizeof(data->dasd_io_secs)); 413 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, 414 sizeof(data->dasd_io_times)); 415 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, 416 sizeof(data->dasd_io_timps)); 417 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, 418 sizeof(data->dasd_io_time1)); 419 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, 420 sizeof(data->dasd_io_time2)); 421 memcpy(data->dasd_io_time2ps, 422 block->profile.data->dasd_io_time2ps, 423 sizeof(data->dasd_io_time2ps)); 424 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, 425 sizeof(data->dasd_io_time3)); 426 memcpy(data->dasd_io_nr_req, 427 block->profile.data->dasd_io_nr_req, 428 sizeof(data->dasd_io_nr_req)); 429 spin_unlock_bh(&block->profile.lock); 430 } else { 431 spin_unlock_bh(&block->profile.lock); 432 rc = -EIO; 433 goto out; 434 } 435 if (copy_to_user(argp, data, sizeof(*data))) 436 rc = -EFAULT; 437 out: 438 kfree(data); 439 return rc; 440 } 441 #else 442 static int dasd_ioctl_reset_profile(struct dasd_block *block) 443 { 444 return -ENOTTY; 445 } 446 447 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 448 { 449 return -ENOTTY; 450 } 451 #endif 452 453 /* 454 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 455 */ 456 static int __dasd_ioctl_information(struct dasd_block *block, 457 struct dasd_information2_t *dasd_info) 458 { 459 struct subchannel_id sch_id; 460 struct ccw_dev_id dev_id; 461 struct dasd_device *base; 462 struct ccw_device *cdev; 463 struct list_head *l; 464 unsigned long flags; 465 int rc; 466 467 base = block->base; 468 if (!base->discipline || !base->discipline->fill_info) 469 return -EINVAL; 470 471 rc = base->discipline->fill_info(base, dasd_info); 472 if (rc) 473 return rc; 474 475 cdev = base->cdev; 476 ccw_device_get_id(cdev, &dev_id); 477 ccw_device_get_schid(cdev, &sch_id); 478 479 dasd_info->devno = dev_id.devno; 480 dasd_info->schid = sch_id.sch_no; 481 dasd_info->cu_type = cdev->id.cu_type; 482 dasd_info->cu_model = cdev->id.cu_model; 483 dasd_info->dev_type = cdev->id.dev_type; 484 dasd_info->dev_model = cdev->id.dev_model; 485 dasd_info->status = base->state; 486 /* 487 * The open_count is increased for every opener, that includes 488 * the blkdev_get in dasd_scan_partitions. 489 * This must be hidden from user-space. 490 */ 491 dasd_info->open_count = atomic_read(&block->open_count); 492 if (!block->bdev) 493 dasd_info->open_count++; 494 495 /* 496 * check if device is really formatted 497 * LDL / CDL was returned by 'fill_info' 498 */ 499 if ((base->state < DASD_STATE_READY) || 500 (dasd_check_blocksize(block->bp_block))) 501 dasd_info->format = DASD_FORMAT_NONE; 502 503 dasd_info->features |= 504 ((base->features & DASD_FEATURE_READONLY) != 0); 505 506 memcpy(dasd_info->type, base->discipline->name, 4); 507 508 spin_lock_irqsave(&block->queue_lock, flags); 509 list_for_each(l, &base->ccw_queue) 510 dasd_info->chanq_len++; 511 spin_unlock_irqrestore(&block->queue_lock, flags); 512 return 0; 513 } 514 515 static int dasd_ioctl_information(struct dasd_block *block, void __user *argp, 516 size_t copy_size) 517 { 518 struct dasd_information2_t *dasd_info; 519 int error; 520 521 dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL); 522 if (!dasd_info) 523 return -ENOMEM; 524 525 error = __dasd_ioctl_information(block, dasd_info); 526 if (!error && copy_to_user(argp, dasd_info, copy_size)) 527 error = -EFAULT; 528 kfree(dasd_info); 529 return error; 530 } 531 532 /* 533 * Set read only 534 */ 535 static int 536 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 537 { 538 struct dasd_device *base; 539 int intval, rc; 540 541 if (!capable(CAP_SYS_ADMIN)) 542 return -EACCES; 543 if (bdev_is_partition(bdev)) 544 // ro setting is not allowed for partitions 545 return -EINVAL; 546 if (get_user(intval, (int __user *)argp)) 547 return -EFAULT; 548 base = dasd_device_from_gendisk(bdev->bd_disk); 549 if (!base) 550 return -ENODEV; 551 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 552 dasd_put_device(base); 553 return -EROFS; 554 } 555 set_disk_ro(bdev->bd_disk, intval); 556 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 557 dasd_put_device(base); 558 return rc; 559 } 560 561 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 562 struct cmbdata __user *argp) 563 { 564 size_t size = _IOC_SIZE(cmd); 565 struct cmbdata data; 566 int ret; 567 568 ret = cmf_readall(block->base->cdev, &data); 569 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 570 return -EFAULT; 571 return ret; 572 } 573 574 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 575 unsigned int cmd, unsigned long arg) 576 { 577 struct dasd_block *block; 578 struct dasd_device *base; 579 void __user *argp; 580 int rc; 581 582 if (is_compat_task()) 583 argp = compat_ptr(arg); 584 else 585 argp = (void __user *)arg; 586 587 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 588 PRINT_DEBUG("empty data ptr"); 589 return -EINVAL; 590 } 591 592 base = dasd_device_from_gendisk(bdev->bd_disk); 593 if (!base) 594 return -ENODEV; 595 block = base->block; 596 rc = 0; 597 switch (cmd) { 598 case BIODASDDISABLE: 599 rc = dasd_ioctl_disable(bdev); 600 break; 601 case BIODASDENABLE: 602 rc = dasd_ioctl_enable(bdev); 603 break; 604 case BIODASDQUIESCE: 605 rc = dasd_ioctl_quiesce(block); 606 break; 607 case BIODASDRESUME: 608 rc = dasd_ioctl_resume(block); 609 break; 610 case BIODASDABORTIO: 611 rc = dasd_ioctl_abortio(block); 612 break; 613 case BIODASDALLOWIO: 614 rc = dasd_ioctl_allowio(block); 615 break; 616 case BIODASDFMT: 617 rc = dasd_ioctl_format(bdev, argp); 618 break; 619 case BIODASDCHECKFMT: 620 rc = dasd_ioctl_check_format(bdev, argp); 621 break; 622 case BIODASDINFO: 623 rc = dasd_ioctl_information(block, argp, 624 sizeof(struct dasd_information_t)); 625 break; 626 case BIODASDINFO2: 627 rc = dasd_ioctl_information(block, argp, 628 sizeof(struct dasd_information2_t)); 629 break; 630 case BIODASDPRRD: 631 rc = dasd_ioctl_read_profile(block, argp); 632 break; 633 case BIODASDPRRST: 634 rc = dasd_ioctl_reset_profile(block); 635 break; 636 case BLKROSET: 637 rc = dasd_ioctl_set_ro(bdev, argp); 638 break; 639 case DASDAPIVER: 640 rc = dasd_ioctl_api_version(argp); 641 break; 642 case BIODASDCMFENABLE: 643 rc = enable_cmf(base->cdev); 644 break; 645 case BIODASDCMFDISABLE: 646 rc = disable_cmf(base->cdev); 647 break; 648 case BIODASDREADALLCMB: 649 rc = dasd_ioctl_readall_cmb(block, cmd, argp); 650 break; 651 case BIODASDRAS: 652 rc = dasd_ioctl_release_space(bdev, argp); 653 break; 654 default: 655 /* if the discipline has an ioctl method try it. */ 656 rc = -ENOTTY; 657 if (base->discipline->ioctl) 658 rc = base->discipline->ioctl(block, cmd, argp); 659 } 660 dasd_put_device(base); 661 return rc; 662 } 663 664 665 /** 666 * dasd_biodasdinfo() - fill out the dasd information structure 667 * @disk [in]: pointer to gendisk structure that references a DASD 668 * @info [out]: pointer to the dasd_information2_t structure 669 * 670 * Provide access to DASD specific information. 671 * The gendisk structure is checked if it belongs to the DASD driver by 672 * comparing the gendisk->fops pointer. 673 * If it does not belong to the DASD driver -EINVAL is returned. 674 * Otherwise the provided dasd_information2_t structure is filled out. 675 * 676 * Returns: 677 * %0 on success and a negative error value on failure. 678 */ 679 int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info) 680 { 681 struct dasd_device *base; 682 int error; 683 684 if (disk->fops != &dasd_device_operations) 685 return -EINVAL; 686 687 base = dasd_device_from_gendisk(disk); 688 if (!base) 689 return -ENODEV; 690 error = __dasd_ioctl_information(base->block, info); 691 dasd_put_device(base); 692 return error; 693 } 694 /* export that symbol_get in partition detection is possible */ 695 EXPORT_SYMBOL_GPL(dasd_biodasdinfo); 696