1 /* 2 * File...........: linux/drivers/s390/block/dasd_ioctl.c 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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 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/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/cmb.h> 23 #include <asm/uaccess.h> 24 25 /* This is ugly... */ 26 #define PRINTK_HEADER "dasd_ioctl:" 27 28 #include "dasd_int.h" 29 30 31 static int 32 dasd_ioctl_api_version(void __user *argp) 33 { 34 int ver = DASD_API_VERSION; 35 return put_user(ver, (int __user *)argp); 36 } 37 38 /* 39 * Enable device. 40 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection 41 */ 42 static int 43 dasd_ioctl_enable(struct block_device *bdev) 44 { 45 struct dasd_device *base; 46 47 if (!capable(CAP_SYS_ADMIN)) 48 return -EACCES; 49 50 base = dasd_device_from_gendisk(bdev->bd_disk); 51 if (!base) 52 return -ENODEV; 53 54 dasd_enable_device(base); 55 /* Formatting the dasd device can change the capacity. */ 56 mutex_lock(&bdev->bd_mutex); 57 i_size_write(bdev->bd_inode, 58 (loff_t)get_capacity(base->block->gdp) << 9); 59 mutex_unlock(&bdev->bd_mutex); 60 dasd_put_device(base); 61 return 0; 62 } 63 64 /* 65 * Disable device. 66 * Used by dasdfmt. Disable I/O operations but allow ioctls. 67 */ 68 static int 69 dasd_ioctl_disable(struct block_device *bdev) 70 { 71 struct dasd_device *base; 72 73 if (!capable(CAP_SYS_ADMIN)) 74 return -EACCES; 75 76 base = dasd_device_from_gendisk(bdev->bd_disk); 77 if (!base) 78 return -ENODEV; 79 /* 80 * Man this is sick. We don't do a real disable but only downgrade 81 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses 82 * BIODASDDISABLE to disable accesses to the device via the block 83 * device layer but it still wants to do i/o on the device by 84 * using the BIODASDFMT ioctl. Therefore the correct state for the 85 * device is DASD_STATE_BASIC that allows to do basic i/o. 86 */ 87 dasd_set_target_state(base, DASD_STATE_BASIC); 88 /* 89 * Set i_size to zero, since read, write, etc. check against this 90 * value. 91 */ 92 mutex_lock(&bdev->bd_mutex); 93 i_size_write(bdev->bd_inode, 0); 94 mutex_unlock(&bdev->bd_mutex); 95 dasd_put_device(base); 96 return 0; 97 } 98 99 /* 100 * Quiesce device. 101 */ 102 static int dasd_ioctl_quiesce(struct dasd_block *block) 103 { 104 unsigned long flags; 105 struct dasd_device *base; 106 107 base = block->base; 108 if (!capable (CAP_SYS_ADMIN)) 109 return -EACCES; 110 111 pr_info("%s: The DASD has been put in the quiesce " 112 "state\n", dev_name(&base->cdev->dev)); 113 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 114 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 115 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 116 return 0; 117 } 118 119 120 /* 121 * Resume device. 122 */ 123 static int dasd_ioctl_resume(struct dasd_block *block) 124 { 125 unsigned long flags; 126 struct dasd_device *base; 127 128 base = block->base; 129 if (!capable (CAP_SYS_ADMIN)) 130 return -EACCES; 131 132 pr_info("%s: I/O operations have been resumed " 133 "on the DASD\n", dev_name(&base->cdev->dev)); 134 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 135 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); 136 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 137 138 dasd_schedule_block_bh(block); 139 return 0; 140 } 141 142 /* 143 * performs formatting of _device_ according to _fdata_ 144 * Note: The discipline's format_function is assumed to deliver formatting 145 * commands to format a single unit of the device. In terms of the ECKD 146 * devices this means CCWs are generated to format a single track. 147 */ 148 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) 149 { 150 struct dasd_ccw_req *cqr; 151 struct dasd_device *base; 152 int rc; 153 154 base = block->base; 155 if (base->discipline->format_device == NULL) 156 return -EPERM; 157 158 if (base->state != DASD_STATE_BASIC) { 159 pr_warning("%s: The DASD cannot be formatted while it is " 160 "enabled\n", dev_name(&base->cdev->dev)); 161 return -EBUSY; 162 } 163 164 DBF_DEV_EVENT(DBF_NOTICE, base, 165 "formatting units %u to %u (%u B blocks) flags %u", 166 fdata->start_unit, 167 fdata->stop_unit, fdata->blksize, fdata->intensity); 168 169 /* Since dasdfmt keeps the device open after it was disabled, 170 * there still exists an inode for this device. 171 * We must update i_blkbits, otherwise we might get errors when 172 * enabling the device later. 173 */ 174 if (fdata->start_unit == 0) { 175 struct block_device *bdev = bdget_disk(block->gdp, 0); 176 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 177 bdput(bdev); 178 } 179 180 while (fdata->start_unit <= fdata->stop_unit) { 181 cqr = base->discipline->format_device(base, fdata); 182 if (IS_ERR(cqr)) 183 return PTR_ERR(cqr); 184 rc = dasd_sleep_on_interruptible(cqr); 185 dasd_sfree_request(cqr, cqr->memdev); 186 if (rc) { 187 if (rc != -ERESTARTSYS) 188 pr_err("%s: Formatting unit %d failed with " 189 "rc=%d\n", dev_name(&base->cdev->dev), 190 fdata->start_unit, rc); 191 return rc; 192 } 193 fdata->start_unit++; 194 } 195 return 0; 196 } 197 198 /* 199 * Format device. 200 */ 201 static int 202 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 203 { 204 struct dasd_device *base; 205 struct format_data_t fdata; 206 int rc; 207 208 if (!capable(CAP_SYS_ADMIN)) 209 return -EACCES; 210 if (!argp) 211 return -EINVAL; 212 base = dasd_device_from_gendisk(bdev->bd_disk); 213 if (!base) 214 return -ENODEV; 215 if (base->features & DASD_FEATURE_READONLY || 216 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 217 dasd_put_device(base); 218 return -EROFS; 219 } 220 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { 221 dasd_put_device(base); 222 return -EFAULT; 223 } 224 if (bdev != bdev->bd_contains) { 225 pr_warning("%s: The specified DASD is a partition and cannot " 226 "be formatted\n", 227 dev_name(&base->cdev->dev)); 228 dasd_put_device(base); 229 return -EINVAL; 230 } 231 rc = dasd_format(base->block, &fdata); 232 dasd_put_device(base); 233 return rc; 234 } 235 236 #ifdef CONFIG_DASD_PROFILE 237 /* 238 * Reset device profile information 239 */ 240 static int dasd_ioctl_reset_profile(struct dasd_block *block) 241 { 242 dasd_profile_reset(&block->profile); 243 return 0; 244 } 245 246 /* 247 * Return device profile information 248 */ 249 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 250 { 251 struct dasd_profile_info_t *data; 252 int rc = 0; 253 254 data = kmalloc(sizeof(*data), GFP_KERNEL); 255 if (!data) 256 return -ENOMEM; 257 258 spin_lock_bh(&block->profile.lock); 259 if (block->profile.data) { 260 data->dasd_io_reqs = block->profile.data->dasd_io_reqs; 261 data->dasd_io_sects = block->profile.data->dasd_io_sects; 262 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs, 263 sizeof(data->dasd_io_secs)); 264 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times, 265 sizeof(data->dasd_io_times)); 266 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps, 267 sizeof(data->dasd_io_timps)); 268 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1, 269 sizeof(data->dasd_io_time1)); 270 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2, 271 sizeof(data->dasd_io_time2)); 272 memcpy(data->dasd_io_time2ps, 273 block->profile.data->dasd_io_time2ps, 274 sizeof(data->dasd_io_time2ps)); 275 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3, 276 sizeof(data->dasd_io_time3)); 277 memcpy(data->dasd_io_nr_req, 278 block->profile.data->dasd_io_nr_req, 279 sizeof(data->dasd_io_nr_req)); 280 spin_unlock_bh(&block->profile.lock); 281 } else { 282 spin_unlock_bh(&block->profile.lock); 283 rc = -EIO; 284 goto out; 285 } 286 if (copy_to_user(argp, data, sizeof(*data))) 287 rc = -EFAULT; 288 out: 289 kfree(data); 290 return rc; 291 } 292 #else 293 static int dasd_ioctl_reset_profile(struct dasd_block *block) 294 { 295 return -ENOSYS; 296 } 297 298 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 299 { 300 return -ENOSYS; 301 } 302 #endif 303 304 /* 305 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 306 */ 307 static int dasd_ioctl_information(struct dasd_block *block, 308 unsigned int cmd, void __user *argp) 309 { 310 struct dasd_information2_t *dasd_info; 311 unsigned long flags; 312 int rc; 313 struct dasd_device *base; 314 struct ccw_device *cdev; 315 struct ccw_dev_id dev_id; 316 317 base = block->base; 318 if (!base->discipline || !base->discipline->fill_info) 319 return -EINVAL; 320 321 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 322 if (dasd_info == NULL) 323 return -ENOMEM; 324 325 rc = base->discipline->fill_info(base, dasd_info); 326 if (rc) { 327 kfree(dasd_info); 328 return rc; 329 } 330 331 cdev = base->cdev; 332 ccw_device_get_id(cdev, &dev_id); 333 334 dasd_info->devno = dev_id.devno; 335 dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); 336 dasd_info->cu_type = cdev->id.cu_type; 337 dasd_info->cu_model = cdev->id.cu_model; 338 dasd_info->dev_type = cdev->id.dev_type; 339 dasd_info->dev_model = cdev->id.dev_model; 340 dasd_info->status = base->state; 341 /* 342 * The open_count is increased for every opener, that includes 343 * the blkdev_get in dasd_scan_partitions. 344 * This must be hidden from user-space. 345 */ 346 dasd_info->open_count = atomic_read(&block->open_count); 347 if (!block->bdev) 348 dasd_info->open_count++; 349 350 /* 351 * check if device is really formatted 352 * LDL / CDL was returned by 'fill_info' 353 */ 354 if ((base->state < DASD_STATE_READY) || 355 (dasd_check_blocksize(block->bp_block))) 356 dasd_info->format = DASD_FORMAT_NONE; 357 358 dasd_info->features |= 359 ((base->features & DASD_FEATURE_READONLY) != 0); 360 361 memcpy(dasd_info->type, base->discipline->name, 4); 362 363 if (block->request_queue->request_fn) { 364 struct list_head *l; 365 #ifdef DASD_EXTENDED_PROFILING 366 { 367 struct list_head *l; 368 spin_lock_irqsave(&block->lock, flags); 369 list_for_each(l, &block->request_queue->queue_head) 370 dasd_info->req_queue_len++; 371 spin_unlock_irqrestore(&block->lock, flags); 372 } 373 #endif /* DASD_EXTENDED_PROFILING */ 374 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 375 list_for_each(l, &base->ccw_queue) 376 dasd_info->chanq_len++; 377 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 378 flags); 379 } 380 381 rc = 0; 382 if (copy_to_user(argp, dasd_info, 383 ((cmd == (unsigned int) BIODASDINFO2) ? 384 sizeof(struct dasd_information2_t) : 385 sizeof(struct dasd_information_t)))) 386 rc = -EFAULT; 387 kfree(dasd_info); 388 return rc; 389 } 390 391 /* 392 * Set read only 393 */ 394 static int 395 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 396 { 397 struct dasd_device *base; 398 int intval, rc; 399 400 if (!capable(CAP_SYS_ADMIN)) 401 return -EACCES; 402 if (bdev != bdev->bd_contains) 403 // ro setting is not allowed for partitions 404 return -EINVAL; 405 if (get_user(intval, (int __user *)argp)) 406 return -EFAULT; 407 base = dasd_device_from_gendisk(bdev->bd_disk); 408 if (!base) 409 return -ENODEV; 410 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 411 dasd_put_device(base); 412 return -EROFS; 413 } 414 set_disk_ro(bdev->bd_disk, intval); 415 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 416 dasd_put_device(base); 417 return rc; 418 } 419 420 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 421 struct cmbdata __user *argp) 422 { 423 size_t size = _IOC_SIZE(cmd); 424 struct cmbdata data; 425 int ret; 426 427 ret = cmf_readall(block->base->cdev, &data); 428 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 429 return -EFAULT; 430 return ret; 431 } 432 433 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 434 unsigned int cmd, unsigned long arg) 435 { 436 struct dasd_block *block; 437 struct dasd_device *base; 438 void __user *argp; 439 int rc; 440 441 if (is_compat_task()) 442 argp = compat_ptr(arg); 443 else 444 argp = (void __user *)arg; 445 446 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 447 PRINT_DEBUG("empty data ptr"); 448 return -EINVAL; 449 } 450 451 base = dasd_device_from_gendisk(bdev->bd_disk); 452 if (!base) 453 return -ENODEV; 454 block = base->block; 455 rc = 0; 456 switch (cmd) { 457 case BIODASDDISABLE: 458 rc = dasd_ioctl_disable(bdev); 459 break; 460 case BIODASDENABLE: 461 rc = dasd_ioctl_enable(bdev); 462 break; 463 case BIODASDQUIESCE: 464 rc = dasd_ioctl_quiesce(block); 465 break; 466 case BIODASDRESUME: 467 rc = dasd_ioctl_resume(block); 468 break; 469 case BIODASDFMT: 470 rc = dasd_ioctl_format(bdev, argp); 471 break; 472 case BIODASDINFO: 473 rc = dasd_ioctl_information(block, cmd, argp); 474 break; 475 case BIODASDINFO2: 476 rc = dasd_ioctl_information(block, cmd, argp); 477 break; 478 case BIODASDPRRD: 479 rc = dasd_ioctl_read_profile(block, argp); 480 break; 481 case BIODASDPRRST: 482 rc = dasd_ioctl_reset_profile(block); 483 break; 484 case BLKROSET: 485 rc = dasd_ioctl_set_ro(bdev, argp); 486 break; 487 case DASDAPIVER: 488 rc = dasd_ioctl_api_version(argp); 489 break; 490 case BIODASDCMFENABLE: 491 rc = enable_cmf(base->cdev); 492 break; 493 case BIODASDCMFDISABLE: 494 rc = disable_cmf(base->cdev); 495 break; 496 case BIODASDREADALLCMB: 497 rc = dasd_ioctl_readall_cmb(block, cmd, argp); 498 break; 499 default: 500 /* if the discipline has an ioctl method try it. */ 501 if (base->discipline->ioctl) { 502 rc = base->discipline->ioctl(block, cmd, argp); 503 if (rc == -ENOIOCTLCMD) 504 rc = -EINVAL; 505 } else 506 rc = -EINVAL; 507 } 508 dasd_put_device(base); 509 return rc; 510 } 511