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 * performs formatting of _device_ according to _fdata_ 145 * Note: The discipline's format_function is assumed to deliver formatting 146 * commands to format a single unit of the device. In terms of the ECKD 147 * devices this means CCWs are generated to format a single track. 148 */ 149 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) 150 { 151 struct dasd_ccw_req *cqr; 152 struct dasd_device *base; 153 int rc; 154 155 base = block->base; 156 if (base->discipline->format_device == NULL) 157 return -EPERM; 158 159 if (base->state != DASD_STATE_BASIC) { 160 pr_warning("%s: The DASD cannot be formatted while it is " 161 "enabled\n", dev_name(&base->cdev->dev)); 162 return -EBUSY; 163 } 164 165 DBF_DEV_EVENT(DBF_NOTICE, base, 166 "formatting units %u to %u (%u B blocks) flags %u", 167 fdata->start_unit, 168 fdata->stop_unit, fdata->blksize, fdata->intensity); 169 170 /* Since dasdfmt keeps the device open after it was disabled, 171 * there still exists an inode for this device. 172 * We must update i_blkbits, otherwise we might get errors when 173 * enabling the device later. 174 */ 175 if (fdata->start_unit == 0) { 176 struct block_device *bdev = bdget_disk(block->gdp, 0); 177 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 178 bdput(bdev); 179 } 180 181 while (fdata->start_unit <= fdata->stop_unit) { 182 cqr = base->discipline->format_device(base, fdata); 183 if (IS_ERR(cqr)) 184 return PTR_ERR(cqr); 185 rc = dasd_sleep_on_interruptible(cqr); 186 dasd_sfree_request(cqr, cqr->memdev); 187 if (rc) { 188 if (rc != -ERESTARTSYS) 189 pr_err("%s: Formatting unit %d failed with " 190 "rc=%d\n", dev_name(&base->cdev->dev), 191 fdata->start_unit, rc); 192 return rc; 193 } 194 fdata->start_unit++; 195 } 196 return 0; 197 } 198 199 /* 200 * Format device. 201 */ 202 static int 203 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 204 { 205 struct dasd_device *base; 206 struct format_data_t fdata; 207 int rc; 208 209 if (!capable(CAP_SYS_ADMIN)) 210 return -EACCES; 211 if (!argp) 212 return -EINVAL; 213 base = dasd_device_from_gendisk(bdev->bd_disk); 214 if (!base) 215 return -ENODEV; 216 if (base->features & DASD_FEATURE_READONLY || 217 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 218 dasd_put_device(base); 219 return -EROFS; 220 } 221 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { 222 dasd_put_device(base); 223 return -EFAULT; 224 } 225 if (bdev != bdev->bd_contains) { 226 pr_warning("%s: The specified DASD is a partition and cannot " 227 "be formatted\n", 228 dev_name(&base->cdev->dev)); 229 dasd_put_device(base); 230 return -EINVAL; 231 } 232 rc = dasd_format(base->block, &fdata); 233 dasd_put_device(base); 234 return rc; 235 } 236 237 #ifdef CONFIG_DASD_PROFILE 238 /* 239 * Reset device profile information 240 */ 241 static int dasd_ioctl_reset_profile(struct dasd_block *block) 242 { 243 dasd_profile_reset(&block->profile); 244 return 0; 245 } 246 247 /* 248 * Return device profile information 249 */ 250 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 251 { 252 struct dasd_profile_info_t *data; 253 int rc = 0; 254 255 data = kmalloc(sizeof(*data), GFP_KERNEL); 256 if (!data) 257 return -ENOMEM; 258 259 spin_lock_bh(&block->profile.lock); 260 if (block->profile.data) { 261 data->dasd_io_reqs = block->profile.data->dasd_io_reqs; 262 data->dasd_io_sects = block->profile.data->dasd_io_sects; 263 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, 264 sizeof(data->dasd_io_secs)); 265 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, 266 sizeof(data->dasd_io_times)); 267 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, 268 sizeof(data->dasd_io_timps)); 269 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, 270 sizeof(data->dasd_io_time1)); 271 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, 272 sizeof(data->dasd_io_time2)); 273 memcpy(data->dasd_io_time2ps, 274 block->profile.data->dasd_io_time2ps, 275 sizeof(data->dasd_io_time2ps)); 276 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, 277 sizeof(data->dasd_io_time3)); 278 memcpy(data->dasd_io_nr_req, 279 block->profile.data->dasd_io_nr_req, 280 sizeof(data->dasd_io_nr_req)); 281 spin_unlock_bh(&block->profile.lock); 282 } else { 283 spin_unlock_bh(&block->profile.lock); 284 rc = -EIO; 285 goto out; 286 } 287 if (copy_to_user(argp, data, sizeof(*data))) 288 rc = -EFAULT; 289 out: 290 kfree(data); 291 return rc; 292 } 293 #else 294 static int dasd_ioctl_reset_profile(struct dasd_block *block) 295 { 296 return -ENOTTY; 297 } 298 299 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 300 { 301 return -ENOTTY; 302 } 303 #endif 304 305 /* 306 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 307 */ 308 static int dasd_ioctl_information(struct dasd_block *block, 309 unsigned int cmd, void __user *argp) 310 { 311 struct dasd_information2_t *dasd_info; 312 struct subchannel_id sch_id; 313 struct ccw_dev_id dev_id; 314 struct dasd_device *base; 315 struct ccw_device *cdev; 316 unsigned long flags; 317 int rc; 318 319 base = block->base; 320 if (!base->discipline || !base->discipline->fill_info) 321 return -EINVAL; 322 323 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 324 if (dasd_info == NULL) 325 return -ENOMEM; 326 327 rc = base->discipline->fill_info(base, dasd_info); 328 if (rc) { 329 kfree(dasd_info); 330 return rc; 331 } 332 333 cdev = base->cdev; 334 ccw_device_get_id(cdev, &dev_id); 335 ccw_device_get_schid(cdev, &sch_id); 336 337 dasd_info->devno = dev_id.devno; 338 dasd_info->schid = sch_id.sch_no; 339 dasd_info->cu_type = cdev->id.cu_type; 340 dasd_info->cu_model = cdev->id.cu_model; 341 dasd_info->dev_type = cdev->id.dev_type; 342 dasd_info->dev_model = cdev->id.dev_model; 343 dasd_info->status = base->state; 344 /* 345 * The open_count is increased for every opener, that includes 346 * the blkdev_get in dasd_scan_partitions. 347 * This must be hidden from user-space. 348 */ 349 dasd_info->open_count = atomic_read(&block->open_count); 350 if (!block->bdev) 351 dasd_info->open_count++; 352 353 /* 354 * check if device is really formatted 355 * LDL / CDL was returned by 'fill_info' 356 */ 357 if ((base->state < DASD_STATE_READY) || 358 (dasd_check_blocksize(block->bp_block))) 359 dasd_info->format = DASD_FORMAT_NONE; 360 361 dasd_info->features |= 362 ((base->features & DASD_FEATURE_READONLY) != 0); 363 364 memcpy(dasd_info->type, base->discipline->name, 4); 365 366 if (block->request_queue->request_fn) { 367 struct list_head *l; 368 #ifdef DASD_EXTENDED_PROFILING 369 { 370 struct list_head *l; 371 spin_lock_irqsave(&block->lock, flags); 372 list_for_each(l, &block->request_queue->queue_head) 373 dasd_info->req_queue_len++; 374 spin_unlock_irqrestore(&block->lock, flags); 375 } 376 #endif /* DASD_EXTENDED_PROFILING */ 377 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 378 list_for_each(l, &base->ccw_queue) 379 dasd_info->chanq_len++; 380 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 381 flags); 382 } 383 384 rc = 0; 385 if (copy_to_user(argp, dasd_info, 386 ((cmd == (unsigned int) BIODASDINFO2) ? 387 sizeof(struct dasd_information2_t) : 388 sizeof(struct dasd_information_t)))) 389 rc = -EFAULT; 390 kfree(dasd_info); 391 return rc; 392 } 393 394 /* 395 * Set read only 396 */ 397 static int 398 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 399 { 400 struct dasd_device *base; 401 int intval, rc; 402 403 if (!capable(CAP_SYS_ADMIN)) 404 return -EACCES; 405 if (bdev != bdev->bd_contains) 406 // ro setting is not allowed for partitions 407 return -EINVAL; 408 if (get_user(intval, (int __user *)argp)) 409 return -EFAULT; 410 base = dasd_device_from_gendisk(bdev->bd_disk); 411 if (!base) 412 return -ENODEV; 413 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 414 dasd_put_device(base); 415 return -EROFS; 416 } 417 set_disk_ro(bdev->bd_disk, intval); 418 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 419 dasd_put_device(base); 420 return rc; 421 } 422 423 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 424 struct cmbdata __user *argp) 425 { 426 size_t size = _IOC_SIZE(cmd); 427 struct cmbdata data; 428 int ret; 429 430 ret = cmf_readall(block->base->cdev, &data); 431 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 432 return -EFAULT; 433 return ret; 434 } 435 436 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 437 unsigned int cmd, unsigned long arg) 438 { 439 struct dasd_block *block; 440 struct dasd_device *base; 441 void __user *argp; 442 int rc; 443 444 if (is_compat_task()) 445 argp = compat_ptr(arg); 446 else 447 argp = (void __user *)arg; 448 449 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 450 PRINT_DEBUG("empty data ptr"); 451 return -EINVAL; 452 } 453 454 base = dasd_device_from_gendisk(bdev->bd_disk); 455 if (!base) 456 return -ENODEV; 457 block = base->block; 458 rc = 0; 459 switch (cmd) { 460 case BIODASDDISABLE: 461 rc = dasd_ioctl_disable(bdev); 462 break; 463 case BIODASDENABLE: 464 rc = dasd_ioctl_enable(bdev); 465 break; 466 case BIODASDQUIESCE: 467 rc = dasd_ioctl_quiesce(block); 468 break; 469 case BIODASDRESUME: 470 rc = dasd_ioctl_resume(block); 471 break; 472 case BIODASDFMT: 473 rc = dasd_ioctl_format(bdev, argp); 474 break; 475 case BIODASDINFO: 476 rc = dasd_ioctl_information(block, cmd, argp); 477 break; 478 case BIODASDINFO2: 479 rc = dasd_ioctl_information(block, cmd, argp); 480 break; 481 case BIODASDPRRD: 482 rc = dasd_ioctl_read_profile(block, argp); 483 break; 484 case BIODASDPRRST: 485 rc = dasd_ioctl_reset_profile(block); 486 break; 487 case BLKROSET: 488 rc = dasd_ioctl_set_ro(bdev, argp); 489 break; 490 case DASDAPIVER: 491 rc = dasd_ioctl_api_version(argp); 492 break; 493 case BIODASDCMFENABLE: 494 rc = enable_cmf(base->cdev); 495 break; 496 case BIODASDCMFDISABLE: 497 rc = disable_cmf(base->cdev); 498 break; 499 case BIODASDREADALLCMB: 500 rc = dasd_ioctl_readall_cmb(block, cmd, argp); 501 break; 502 default: 503 /* if the discipline has an ioctl method try it. */ 504 rc = -ENOTTY; 505 if (base->discipline->ioctl) 506 rc = base->discipline->ioctl(block, cmd, argp); 507 } 508 dasd_put_device(base); 509 return rc; 510 } 511