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 #ifdef CONFIG_DASD_PROFILE 337 /* 338 * Reset device profile information 339 */ 340 static int dasd_ioctl_reset_profile(struct dasd_block *block) 341 { 342 dasd_profile_reset(&block->profile); 343 return 0; 344 } 345 346 /* 347 * Return device profile information 348 */ 349 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 350 { 351 struct dasd_profile_info_t *data; 352 int rc = 0; 353 354 data = kmalloc(sizeof(*data), GFP_KERNEL); 355 if (!data) 356 return -ENOMEM; 357 358 spin_lock_bh(&block->profile.lock); 359 if (block->profile.data) { 360 data->dasd_io_reqs = block->profile.data->dasd_io_reqs; 361 data->dasd_io_sects = block->profile.data->dasd_io_sects; 362 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, 363 sizeof(data->dasd_io_secs)); 364 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, 365 sizeof(data->dasd_io_times)); 366 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, 367 sizeof(data->dasd_io_timps)); 368 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, 369 sizeof(data->dasd_io_time1)); 370 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, 371 sizeof(data->dasd_io_time2)); 372 memcpy(data->dasd_io_time2ps, 373 block->profile.data->dasd_io_time2ps, 374 sizeof(data->dasd_io_time2ps)); 375 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, 376 sizeof(data->dasd_io_time3)); 377 memcpy(data->dasd_io_nr_req, 378 block->profile.data->dasd_io_nr_req, 379 sizeof(data->dasd_io_nr_req)); 380 spin_unlock_bh(&block->profile.lock); 381 } else { 382 spin_unlock_bh(&block->profile.lock); 383 rc = -EIO; 384 goto out; 385 } 386 if (copy_to_user(argp, data, sizeof(*data))) 387 rc = -EFAULT; 388 out: 389 kfree(data); 390 return rc; 391 } 392 #else 393 static int dasd_ioctl_reset_profile(struct dasd_block *block) 394 { 395 return -ENOTTY; 396 } 397 398 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 399 { 400 return -ENOTTY; 401 } 402 #endif 403 404 /* 405 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 406 */ 407 static int dasd_ioctl_information(struct dasd_block *block, 408 unsigned int cmd, void __user *argp) 409 { 410 struct dasd_information2_t *dasd_info; 411 struct subchannel_id sch_id; 412 struct ccw_dev_id dev_id; 413 struct dasd_device *base; 414 struct ccw_device *cdev; 415 struct list_head *l; 416 unsigned long flags; 417 int rc; 418 419 base = block->base; 420 if (!base->discipline || !base->discipline->fill_info) 421 return -EINVAL; 422 423 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 424 if (dasd_info == NULL) 425 return -ENOMEM; 426 427 rc = base->discipline->fill_info(base, dasd_info); 428 if (rc) { 429 kfree(dasd_info); 430 return rc; 431 } 432 433 cdev = base->cdev; 434 ccw_device_get_id(cdev, &dev_id); 435 ccw_device_get_schid(cdev, &sch_id); 436 437 dasd_info->devno = dev_id.devno; 438 dasd_info->schid = sch_id.sch_no; 439 dasd_info->cu_type = cdev->id.cu_type; 440 dasd_info->cu_model = cdev->id.cu_model; 441 dasd_info->dev_type = cdev->id.dev_type; 442 dasd_info->dev_model = cdev->id.dev_model; 443 dasd_info->status = base->state; 444 /* 445 * The open_count is increased for every opener, that includes 446 * the blkdev_get in dasd_scan_partitions. 447 * This must be hidden from user-space. 448 */ 449 dasd_info->open_count = atomic_read(&block->open_count); 450 if (!block->bdev) 451 dasd_info->open_count++; 452 453 /* 454 * check if device is really formatted 455 * LDL / CDL was returned by 'fill_info' 456 */ 457 if ((base->state < DASD_STATE_READY) || 458 (dasd_check_blocksize(block->bp_block))) 459 dasd_info->format = DASD_FORMAT_NONE; 460 461 dasd_info->features |= 462 ((base->features & DASD_FEATURE_READONLY) != 0); 463 464 memcpy(dasd_info->type, base->discipline->name, 4); 465 466 spin_lock_irqsave(&block->queue_lock, flags); 467 list_for_each(l, &base->ccw_queue) 468 dasd_info->chanq_len++; 469 spin_unlock_irqrestore(&block->queue_lock, flags); 470 471 rc = 0; 472 if (copy_to_user(argp, dasd_info, 473 ((cmd == (unsigned int) BIODASDINFO2) ? 474 sizeof(struct dasd_information2_t) : 475 sizeof(struct dasd_information_t)))) 476 rc = -EFAULT; 477 kfree(dasd_info); 478 return rc; 479 } 480 481 /* 482 * Set read only 483 */ 484 static int 485 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 486 { 487 struct dasd_device *base; 488 int intval, rc; 489 490 if (!capable(CAP_SYS_ADMIN)) 491 return -EACCES; 492 if (bdev != bdev->bd_contains) 493 // ro setting is not allowed for partitions 494 return -EINVAL; 495 if (get_user(intval, (int __user *)argp)) 496 return -EFAULT; 497 base = dasd_device_from_gendisk(bdev->bd_disk); 498 if (!base) 499 return -ENODEV; 500 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 501 dasd_put_device(base); 502 return -EROFS; 503 } 504 set_disk_ro(bdev->bd_disk, intval); 505 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 506 dasd_put_device(base); 507 return rc; 508 } 509 510 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 511 struct cmbdata __user *argp) 512 { 513 size_t size = _IOC_SIZE(cmd); 514 struct cmbdata data; 515 int ret; 516 517 ret = cmf_readall(block->base->cdev, &data); 518 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 519 return -EFAULT; 520 return ret; 521 } 522 523 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 524 unsigned int cmd, unsigned long arg) 525 { 526 struct dasd_block *block; 527 struct dasd_device *base; 528 void __user *argp; 529 int rc; 530 531 if (is_compat_task()) 532 argp = compat_ptr(arg); 533 else 534 argp = (void __user *)arg; 535 536 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 537 PRINT_DEBUG("empty data ptr"); 538 return -EINVAL; 539 } 540 541 base = dasd_device_from_gendisk(bdev->bd_disk); 542 if (!base) 543 return -ENODEV; 544 block = base->block; 545 rc = 0; 546 switch (cmd) { 547 case BIODASDDISABLE: 548 rc = dasd_ioctl_disable(bdev); 549 break; 550 case BIODASDENABLE: 551 rc = dasd_ioctl_enable(bdev); 552 break; 553 case BIODASDQUIESCE: 554 rc = dasd_ioctl_quiesce(block); 555 break; 556 case BIODASDRESUME: 557 rc = dasd_ioctl_resume(block); 558 break; 559 case BIODASDABORTIO: 560 rc = dasd_ioctl_abortio(block); 561 break; 562 case BIODASDALLOWIO: 563 rc = dasd_ioctl_allowio(block); 564 break; 565 case BIODASDFMT: 566 rc = dasd_ioctl_format(bdev, argp); 567 break; 568 case BIODASDCHECKFMT: 569 rc = dasd_ioctl_check_format(bdev, argp); 570 break; 571 case BIODASDINFO: 572 rc = dasd_ioctl_information(block, cmd, argp); 573 break; 574 case BIODASDINFO2: 575 rc = dasd_ioctl_information(block, cmd, argp); 576 break; 577 case BIODASDPRRD: 578 rc = dasd_ioctl_read_profile(block, argp); 579 break; 580 case BIODASDPRRST: 581 rc = dasd_ioctl_reset_profile(block); 582 break; 583 case BLKROSET: 584 rc = dasd_ioctl_set_ro(bdev, argp); 585 break; 586 case DASDAPIVER: 587 rc = dasd_ioctl_api_version(argp); 588 break; 589 case BIODASDCMFENABLE: 590 rc = enable_cmf(base->cdev); 591 break; 592 case BIODASDCMFDISABLE: 593 rc = disable_cmf(base->cdev); 594 break; 595 case BIODASDREADALLCMB: 596 rc = dasd_ioctl_readall_cmb(block, cmd, argp); 597 break; 598 default: 599 /* if the discipline has an ioctl method try it. */ 600 rc = -ENOTTY; 601 if (base->discipline->ioctl) 602 rc = base->discipline->ioctl(block, cmd, argp); 603 } 604 dasd_put_device(base); 605 return rc; 606 } 607