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