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 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 rc; 207 208 base = block->base; 209 if (base->discipline->format_device == NULL) 210 return -EPERM; 211 212 if (base->state != DASD_STATE_BASIC) { 213 pr_warn("%s: The DASD cannot be formatted while it is enabled\n", 214 dev_name(&base->cdev->dev)); 215 return -EBUSY; 216 } 217 218 DBF_DEV_EVENT(DBF_NOTICE, base, 219 "formatting units %u to %u (%u B blocks) flags %u", 220 fdata->start_unit, 221 fdata->stop_unit, fdata->blksize, fdata->intensity); 222 223 /* Since dasdfmt keeps the device open after it was disabled, 224 * there still exists an inode for this device. 225 * We must update i_blkbits, otherwise we might get errors when 226 * enabling the device later. 227 */ 228 if (fdata->start_unit == 0) { 229 struct block_device *bdev = bdget_disk(block->gdp, 0); 230 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 231 bdput(bdev); 232 } 233 234 rc = base->discipline->format_device(base, fdata, 1); 235 if (rc == -EAGAIN) 236 rc = base->discipline->format_device(base, fdata, 0); 237 238 return rc; 239 } 240 241 static int dasd_check_format(struct dasd_block *block, 242 struct format_check_t *cdata) 243 { 244 struct dasd_device *base; 245 int rc; 246 247 base = block->base; 248 if (!base->discipline->check_device_format) 249 return -ENOTTY; 250 251 rc = base->discipline->check_device_format(base, cdata, 1); 252 if (rc == -EAGAIN) 253 rc = base->discipline->check_device_format(base, cdata, 0); 254 255 return rc; 256 } 257 258 /* 259 * Format device. 260 */ 261 static int 262 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 263 { 264 struct dasd_device *base; 265 struct format_data_t fdata; 266 int rc; 267 268 if (!capable(CAP_SYS_ADMIN)) 269 return -EACCES; 270 if (!argp) 271 return -EINVAL; 272 base = dasd_device_from_gendisk(bdev->bd_disk); 273 if (!base) 274 return -ENODEV; 275 if (base->features & DASD_FEATURE_READONLY || 276 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 277 dasd_put_device(base); 278 return -EROFS; 279 } 280 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { 281 dasd_put_device(base); 282 return -EFAULT; 283 } 284 if (bdev != bdev->bd_contains) { 285 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n", 286 dev_name(&base->cdev->dev)); 287 dasd_put_device(base); 288 return -EINVAL; 289 } 290 rc = dasd_format(base->block, &fdata); 291 dasd_put_device(base); 292 293 return rc; 294 } 295 296 /* 297 * Check device format 298 */ 299 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp) 300 { 301 struct format_check_t cdata; 302 struct dasd_device *base; 303 int rc = 0; 304 305 if (!argp) 306 return -EINVAL; 307 308 base = dasd_device_from_gendisk(bdev->bd_disk); 309 if (!base) 310 return -ENODEV; 311 if (bdev != bdev->bd_contains) { 312 pr_warn("%s: The specified DASD is a partition and cannot be checked\n", 313 dev_name(&base->cdev->dev)); 314 rc = -EINVAL; 315 goto out_err; 316 } 317 318 if (copy_from_user(&cdata, argp, sizeof(cdata))) { 319 rc = -EFAULT; 320 goto out_err; 321 } 322 323 rc = dasd_check_format(base->block, &cdata); 324 if (rc) 325 goto out_err; 326 327 if (copy_to_user(argp, &cdata, sizeof(cdata))) 328 rc = -EFAULT; 329 330 out_err: 331 dasd_put_device(base); 332 333 return rc; 334 } 335 336 static int dasd_release_space(struct dasd_device *device, 337 struct format_data_t *rdata) 338 { 339 if (!device->discipline->is_ese && !device->discipline->is_ese(device)) 340 return -ENOTSUPP; 341 if (!device->discipline->release_space) 342 return -ENOTSUPP; 343 344 return device->discipline->release_space(device, rdata); 345 } 346 347 /* 348 * Release allocated space 349 */ 350 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp) 351 { 352 struct format_data_t rdata; 353 struct dasd_device *base; 354 int rc = 0; 355 356 if (!capable(CAP_SYS_ADMIN)) 357 return -EACCES; 358 if (!argp) 359 return -EINVAL; 360 361 base = dasd_device_from_gendisk(bdev->bd_disk); 362 if (!base) 363 return -ENODEV; 364 if (base->features & DASD_FEATURE_READONLY || 365 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 366 rc = -EROFS; 367 goto out_err; 368 } 369 if (bdev != bdev->bd_contains) { 370 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n", 371 dev_name(&base->cdev->dev)); 372 rc = -EINVAL; 373 goto out_err; 374 } 375 376 if (copy_from_user(&rdata, argp, sizeof(rdata))) { 377 rc = -EFAULT; 378 goto out_err; 379 } 380 381 rc = dasd_release_space(base, &rdata); 382 383 out_err: 384 dasd_put_device(base); 385 386 return rc; 387 } 388 389 #ifdef CONFIG_DASD_PROFILE 390 /* 391 * Reset device profile information 392 */ 393 static int dasd_ioctl_reset_profile(struct dasd_block *block) 394 { 395 dasd_profile_reset(&block->profile); 396 return 0; 397 } 398 399 /* 400 * Return device profile information 401 */ 402 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 403 { 404 struct dasd_profile_info_t *data; 405 int rc = 0; 406 407 data = kmalloc(sizeof(*data), GFP_KERNEL); 408 if (!data) 409 return -ENOMEM; 410 411 spin_lock_bh(&block->profile.lock); 412 if (block->profile.data) { 413 data->dasd_io_reqs = block->profile.data->dasd_io_reqs; 414 data->dasd_io_sects = block->profile.data->dasd_io_sects; 415 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, 416 sizeof(data->dasd_io_secs)); 417 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, 418 sizeof(data->dasd_io_times)); 419 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, 420 sizeof(data->dasd_io_timps)); 421 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, 422 sizeof(data->dasd_io_time1)); 423 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, 424 sizeof(data->dasd_io_time2)); 425 memcpy(data->dasd_io_time2ps, 426 block->profile.data->dasd_io_time2ps, 427 sizeof(data->dasd_io_time2ps)); 428 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, 429 sizeof(data->dasd_io_time3)); 430 memcpy(data->dasd_io_nr_req, 431 block->profile.data->dasd_io_nr_req, 432 sizeof(data->dasd_io_nr_req)); 433 spin_unlock_bh(&block->profile.lock); 434 } else { 435 spin_unlock_bh(&block->profile.lock); 436 rc = -EIO; 437 goto out; 438 } 439 if (copy_to_user(argp, data, sizeof(*data))) 440 rc = -EFAULT; 441 out: 442 kfree(data); 443 return rc; 444 } 445 #else 446 static int dasd_ioctl_reset_profile(struct dasd_block *block) 447 { 448 return -ENOTTY; 449 } 450 451 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 452 { 453 return -ENOTTY; 454 } 455 #endif 456 457 /* 458 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 459 */ 460 static int dasd_ioctl_information(struct dasd_block *block, 461 unsigned int cmd, void __user *argp) 462 { 463 struct dasd_information2_t *dasd_info; 464 struct subchannel_id sch_id; 465 struct ccw_dev_id dev_id; 466 struct dasd_device *base; 467 struct ccw_device *cdev; 468 struct list_head *l; 469 unsigned long flags; 470 int rc; 471 472 base = block->base; 473 if (!base->discipline || !base->discipline->fill_info) 474 return -EINVAL; 475 476 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 477 if (dasd_info == NULL) 478 return -ENOMEM; 479 480 rc = base->discipline->fill_info(base, dasd_info); 481 if (rc) { 482 kfree(dasd_info); 483 return rc; 484 } 485 486 cdev = base->cdev; 487 ccw_device_get_id(cdev, &dev_id); 488 ccw_device_get_schid(cdev, &sch_id); 489 490 dasd_info->devno = dev_id.devno; 491 dasd_info->schid = sch_id.sch_no; 492 dasd_info->cu_type = cdev->id.cu_type; 493 dasd_info->cu_model = cdev->id.cu_model; 494 dasd_info->dev_type = cdev->id.dev_type; 495 dasd_info->dev_model = cdev->id.dev_model; 496 dasd_info->status = base->state; 497 /* 498 * The open_count is increased for every opener, that includes 499 * the blkdev_get in dasd_scan_partitions. 500 * This must be hidden from user-space. 501 */ 502 dasd_info->open_count = atomic_read(&block->open_count); 503 if (!block->bdev) 504 dasd_info->open_count++; 505 506 /* 507 * check if device is really formatted 508 * LDL / CDL was returned by 'fill_info' 509 */ 510 if ((base->state < DASD_STATE_READY) || 511 (dasd_check_blocksize(block->bp_block))) 512 dasd_info->format = DASD_FORMAT_NONE; 513 514 dasd_info->features |= 515 ((base->features & DASD_FEATURE_READONLY) != 0); 516 517 memcpy(dasd_info->type, base->discipline->name, 4); 518 519 spin_lock_irqsave(&block->queue_lock, flags); 520 list_for_each(l, &base->ccw_queue) 521 dasd_info->chanq_len++; 522 spin_unlock_irqrestore(&block->queue_lock, flags); 523 524 rc = 0; 525 if (copy_to_user(argp, dasd_info, 526 ((cmd == (unsigned int) BIODASDINFO2) ? 527 sizeof(struct dasd_information2_t) : 528 sizeof(struct dasd_information_t)))) 529 rc = -EFAULT; 530 kfree(dasd_info); 531 return rc; 532 } 533 534 /* 535 * Set read only 536 */ 537 static int 538 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 539 { 540 struct dasd_device *base; 541 int intval, rc; 542 543 if (!capable(CAP_SYS_ADMIN)) 544 return -EACCES; 545 if (bdev != bdev->bd_contains) 546 // ro setting is not allowed for partitions 547 return -EINVAL; 548 if (get_user(intval, (int __user *)argp)) 549 return -EFAULT; 550 base = dasd_device_from_gendisk(bdev->bd_disk); 551 if (!base) 552 return -ENODEV; 553 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 554 dasd_put_device(base); 555 return -EROFS; 556 } 557 set_disk_ro(bdev->bd_disk, intval); 558 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 559 dasd_put_device(base); 560 return rc; 561 } 562 563 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 564 struct cmbdata __user *argp) 565 { 566 size_t size = _IOC_SIZE(cmd); 567 struct cmbdata data; 568 int ret; 569 570 ret = cmf_readall(block->base->cdev, &data); 571 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 572 return -EFAULT; 573 return ret; 574 } 575 576 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 577 unsigned int cmd, unsigned long arg) 578 { 579 struct dasd_block *block; 580 struct dasd_device *base; 581 void __user *argp; 582 int rc; 583 584 if (is_compat_task()) 585 argp = compat_ptr(arg); 586 else 587 argp = (void __user *)arg; 588 589 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 590 PRINT_DEBUG("empty data ptr"); 591 return -EINVAL; 592 } 593 594 base = dasd_device_from_gendisk(bdev->bd_disk); 595 if (!base) 596 return -ENODEV; 597 block = base->block; 598 rc = 0; 599 switch (cmd) { 600 case BIODASDDISABLE: 601 rc = dasd_ioctl_disable(bdev); 602 break; 603 case BIODASDENABLE: 604 rc = dasd_ioctl_enable(bdev); 605 break; 606 case BIODASDQUIESCE: 607 rc = dasd_ioctl_quiesce(block); 608 break; 609 case BIODASDRESUME: 610 rc = dasd_ioctl_resume(block); 611 break; 612 case BIODASDABORTIO: 613 rc = dasd_ioctl_abortio(block); 614 break; 615 case BIODASDALLOWIO: 616 rc = dasd_ioctl_allowio(block); 617 break; 618 case BIODASDFMT: 619 rc = dasd_ioctl_format(bdev, argp); 620 break; 621 case BIODASDCHECKFMT: 622 rc = dasd_ioctl_check_format(bdev, argp); 623 break; 624 case BIODASDINFO: 625 rc = dasd_ioctl_information(block, cmd, argp); 626 break; 627 case BIODASDINFO2: 628 rc = dasd_ioctl_information(block, cmd, argp); 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