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 * 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); 235 if (rc) 236 return rc; 237 238 return 0; 239 } 240 241 /* 242 * Format device. 243 */ 244 static int 245 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 246 { 247 struct dasd_device *base; 248 struct format_data_t fdata; 249 int rc; 250 251 if (!capable(CAP_SYS_ADMIN)) 252 return -EACCES; 253 if (!argp) 254 return -EINVAL; 255 base = dasd_device_from_gendisk(bdev->bd_disk); 256 if (!base) 257 return -ENODEV; 258 if (base->features & DASD_FEATURE_READONLY || 259 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 260 dasd_put_device(base); 261 return -EROFS; 262 } 263 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { 264 dasd_put_device(base); 265 return -EFAULT; 266 } 267 if (bdev != bdev->bd_contains) { 268 pr_warning("%s: The specified DASD is a partition and cannot " 269 "be formatted\n", 270 dev_name(&base->cdev->dev)); 271 dasd_put_device(base); 272 return -EINVAL; 273 } 274 rc = dasd_format(base->block, &fdata); 275 dasd_put_device(base); 276 return rc; 277 } 278 279 #ifdef CONFIG_DASD_PROFILE 280 /* 281 * Reset device profile information 282 */ 283 static int dasd_ioctl_reset_profile(struct dasd_block *block) 284 { 285 dasd_profile_reset(&block->profile); 286 return 0; 287 } 288 289 /* 290 * Return device profile information 291 */ 292 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 293 { 294 struct dasd_profile_info_t *data; 295 int rc = 0; 296 297 data = kmalloc(sizeof(*data), GFP_KERNEL); 298 if (!data) 299 return -ENOMEM; 300 301 spin_lock_bh(&block->profile.lock); 302 if (block->profile.data) { 303 data->dasd_io_reqs = block->profile.data->dasd_io_reqs; 304 data->dasd_io_sects = block->profile.data->dasd_io_sects; 305 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, 306 sizeof(data->dasd_io_secs)); 307 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, 308 sizeof(data->dasd_io_times)); 309 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, 310 sizeof(data->dasd_io_timps)); 311 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, 312 sizeof(data->dasd_io_time1)); 313 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, 314 sizeof(data->dasd_io_time2)); 315 memcpy(data->dasd_io_time2ps, 316 block->profile.data->dasd_io_time2ps, 317 sizeof(data->dasd_io_time2ps)); 318 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, 319 sizeof(data->dasd_io_time3)); 320 memcpy(data->dasd_io_nr_req, 321 block->profile.data->dasd_io_nr_req, 322 sizeof(data->dasd_io_nr_req)); 323 spin_unlock_bh(&block->profile.lock); 324 } else { 325 spin_unlock_bh(&block->profile.lock); 326 rc = -EIO; 327 goto out; 328 } 329 if (copy_to_user(argp, data, sizeof(*data))) 330 rc = -EFAULT; 331 out: 332 kfree(data); 333 return rc; 334 } 335 #else 336 static int dasd_ioctl_reset_profile(struct dasd_block *block) 337 { 338 return -ENOTTY; 339 } 340 341 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 342 { 343 return -ENOTTY; 344 } 345 #endif 346 347 /* 348 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 349 */ 350 static int dasd_ioctl_information(struct dasd_block *block, 351 unsigned int cmd, void __user *argp) 352 { 353 struct dasd_information2_t *dasd_info; 354 struct subchannel_id sch_id; 355 struct ccw_dev_id dev_id; 356 struct dasd_device *base; 357 struct ccw_device *cdev; 358 unsigned long flags; 359 int rc; 360 361 base = block->base; 362 if (!base->discipline || !base->discipline->fill_info) 363 return -EINVAL; 364 365 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 366 if (dasd_info == NULL) 367 return -ENOMEM; 368 369 rc = base->discipline->fill_info(base, dasd_info); 370 if (rc) { 371 kfree(dasd_info); 372 return rc; 373 } 374 375 cdev = base->cdev; 376 ccw_device_get_id(cdev, &dev_id); 377 ccw_device_get_schid(cdev, &sch_id); 378 379 dasd_info->devno = dev_id.devno; 380 dasd_info->schid = sch_id.sch_no; 381 dasd_info->cu_type = cdev->id.cu_type; 382 dasd_info->cu_model = cdev->id.cu_model; 383 dasd_info->dev_type = cdev->id.dev_type; 384 dasd_info->dev_model = cdev->id.dev_model; 385 dasd_info->status = base->state; 386 /* 387 * The open_count is increased for every opener, that includes 388 * the blkdev_get in dasd_scan_partitions. 389 * This must be hidden from user-space. 390 */ 391 dasd_info->open_count = atomic_read(&block->open_count); 392 if (!block->bdev) 393 dasd_info->open_count++; 394 395 /* 396 * check if device is really formatted 397 * LDL / CDL was returned by 'fill_info' 398 */ 399 if ((base->state < DASD_STATE_READY) || 400 (dasd_check_blocksize(block->bp_block))) 401 dasd_info->format = DASD_FORMAT_NONE; 402 403 dasd_info->features |= 404 ((base->features & DASD_FEATURE_READONLY) != 0); 405 406 memcpy(dasd_info->type, base->discipline->name, 4); 407 408 if (block->request_queue->request_fn) { 409 struct list_head *l; 410 #ifdef DASD_EXTENDED_PROFILING 411 { 412 struct list_head *l; 413 spin_lock_irqsave(&block->lock, flags); 414 list_for_each(l, &block->request_queue->queue_head) 415 dasd_info->req_queue_len++; 416 spin_unlock_irqrestore(&block->lock, flags); 417 } 418 #endif /* DASD_EXTENDED_PROFILING */ 419 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 420 list_for_each(l, &base->ccw_queue) 421 dasd_info->chanq_len++; 422 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 423 flags); 424 } 425 426 rc = 0; 427 if (copy_to_user(argp, dasd_info, 428 ((cmd == (unsigned int) BIODASDINFO2) ? 429 sizeof(struct dasd_information2_t) : 430 sizeof(struct dasd_information_t)))) 431 rc = -EFAULT; 432 kfree(dasd_info); 433 return rc; 434 } 435 436 /* 437 * Set read only 438 */ 439 static int 440 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 441 { 442 struct dasd_device *base; 443 int intval, rc; 444 445 if (!capable(CAP_SYS_ADMIN)) 446 return -EACCES; 447 if (bdev != bdev->bd_contains) 448 // ro setting is not allowed for partitions 449 return -EINVAL; 450 if (get_user(intval, (int __user *)argp)) 451 return -EFAULT; 452 base = dasd_device_from_gendisk(bdev->bd_disk); 453 if (!base) 454 return -ENODEV; 455 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 456 dasd_put_device(base); 457 return -EROFS; 458 } 459 set_disk_ro(bdev->bd_disk, intval); 460 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 461 dasd_put_device(base); 462 return rc; 463 } 464 465 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 466 struct cmbdata __user *argp) 467 { 468 size_t size = _IOC_SIZE(cmd); 469 struct cmbdata data; 470 int ret; 471 472 ret = cmf_readall(block->base->cdev, &data); 473 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 474 return -EFAULT; 475 return ret; 476 } 477 478 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 479 unsigned int cmd, unsigned long arg) 480 { 481 struct dasd_block *block; 482 struct dasd_device *base; 483 void __user *argp; 484 int rc; 485 486 if (is_compat_task()) 487 argp = compat_ptr(arg); 488 else 489 argp = (void __user *)arg; 490 491 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 492 PRINT_DEBUG("empty data ptr"); 493 return -EINVAL; 494 } 495 496 base = dasd_device_from_gendisk(bdev->bd_disk); 497 if (!base) 498 return -ENODEV; 499 block = base->block; 500 rc = 0; 501 switch (cmd) { 502 case BIODASDDISABLE: 503 rc = dasd_ioctl_disable(bdev); 504 break; 505 case BIODASDENABLE: 506 rc = dasd_ioctl_enable(bdev); 507 break; 508 case BIODASDQUIESCE: 509 rc = dasd_ioctl_quiesce(block); 510 break; 511 case BIODASDRESUME: 512 rc = dasd_ioctl_resume(block); 513 break; 514 case BIODASDABORTIO: 515 rc = dasd_ioctl_abortio(block); 516 break; 517 case BIODASDALLOWIO: 518 rc = dasd_ioctl_allowio(block); 519 break; 520 case BIODASDFMT: 521 rc = dasd_ioctl_format(bdev, argp); 522 break; 523 case BIODASDINFO: 524 rc = dasd_ioctl_information(block, cmd, argp); 525 break; 526 case BIODASDINFO2: 527 rc = dasd_ioctl_information(block, cmd, argp); 528 break; 529 case BIODASDPRRD: 530 rc = dasd_ioctl_read_profile(block, argp); 531 break; 532 case BIODASDPRRST: 533 rc = dasd_ioctl_reset_profile(block); 534 break; 535 case BLKROSET: 536 rc = dasd_ioctl_set_ro(bdev, argp); 537 break; 538 case DASDAPIVER: 539 rc = dasd_ioctl_api_version(argp); 540 break; 541 case BIODASDCMFENABLE: 542 rc = enable_cmf(base->cdev); 543 break; 544 case BIODASDCMFDISABLE: 545 rc = disable_cmf(base->cdev); 546 break; 547 case BIODASDREADALLCMB: 548 rc = dasd_ioctl_readall_cmb(block, cmd, argp); 549 break; 550 default: 551 /* if the discipline has an ioctl method try it. */ 552 rc = -ENOTTY; 553 if (base->discipline->ioctl) 554 rc = base->discipline->ioctl(block, cmd, argp); 555 } 556 dasd_put_device(base); 557 return rc; 558 } 559