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 memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); 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 if (dasd_profile_level == DASD_PROFILE_OFF) 252 return -EIO; 253 if (copy_to_user(argp, &block->profile, 254 sizeof(struct dasd_profile_info_t))) 255 return -EFAULT; 256 return 0; 257 } 258 #else 259 static int dasd_ioctl_reset_profile(struct dasd_block *block) 260 { 261 return -ENOSYS; 262 } 263 264 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 265 { 266 return -ENOSYS; 267 } 268 #endif 269 270 /* 271 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 272 */ 273 static int dasd_ioctl_information(struct dasd_block *block, 274 unsigned int cmd, void __user *argp) 275 { 276 struct dasd_information2_t *dasd_info; 277 unsigned long flags; 278 int rc; 279 struct dasd_device *base; 280 struct ccw_device *cdev; 281 struct ccw_dev_id dev_id; 282 283 base = block->base; 284 if (!base->discipline || !base->discipline->fill_info) 285 return -EINVAL; 286 287 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 288 if (dasd_info == NULL) 289 return -ENOMEM; 290 291 rc = base->discipline->fill_info(base, dasd_info); 292 if (rc) { 293 kfree(dasd_info); 294 return rc; 295 } 296 297 cdev = base->cdev; 298 ccw_device_get_id(cdev, &dev_id); 299 300 dasd_info->devno = dev_id.devno; 301 dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); 302 dasd_info->cu_type = cdev->id.cu_type; 303 dasd_info->cu_model = cdev->id.cu_model; 304 dasd_info->dev_type = cdev->id.dev_type; 305 dasd_info->dev_model = cdev->id.dev_model; 306 dasd_info->status = base->state; 307 /* 308 * The open_count is increased for every opener, that includes 309 * the blkdev_get in dasd_scan_partitions. 310 * This must be hidden from user-space. 311 */ 312 dasd_info->open_count = atomic_read(&block->open_count); 313 if (!block->bdev) 314 dasd_info->open_count++; 315 316 /* 317 * check if device is really formatted 318 * LDL / CDL was returned by 'fill_info' 319 */ 320 if ((base->state < DASD_STATE_READY) || 321 (dasd_check_blocksize(block->bp_block))) 322 dasd_info->format = DASD_FORMAT_NONE; 323 324 dasd_info->features |= 325 ((base->features & DASD_FEATURE_READONLY) != 0); 326 327 memcpy(dasd_info->type, base->discipline->name, 4); 328 329 if (block->request_queue->request_fn) { 330 struct list_head *l; 331 #ifdef DASD_EXTENDED_PROFILING 332 { 333 struct list_head *l; 334 spin_lock_irqsave(&block->lock, flags); 335 list_for_each(l, &block->request_queue->queue_head) 336 dasd_info->req_queue_len++; 337 spin_unlock_irqrestore(&block->lock, flags); 338 } 339 #endif /* DASD_EXTENDED_PROFILING */ 340 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 341 list_for_each(l, &base->ccw_queue) 342 dasd_info->chanq_len++; 343 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 344 flags); 345 } 346 347 rc = 0; 348 if (copy_to_user(argp, dasd_info, 349 ((cmd == (unsigned int) BIODASDINFO2) ? 350 sizeof(struct dasd_information2_t) : 351 sizeof(struct dasd_information_t)))) 352 rc = -EFAULT; 353 kfree(dasd_info); 354 return rc; 355 } 356 357 /* 358 * Set read only 359 */ 360 static int 361 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 362 { 363 struct dasd_device *base; 364 int intval, rc; 365 366 if (!capable(CAP_SYS_ADMIN)) 367 return -EACCES; 368 if (bdev != bdev->bd_contains) 369 // ro setting is not allowed for partitions 370 return -EINVAL; 371 if (get_user(intval, (int __user *)argp)) 372 return -EFAULT; 373 base = dasd_device_from_gendisk(bdev->bd_disk); 374 if (!base) 375 return -ENODEV; 376 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { 377 dasd_put_device(base); 378 return -EROFS; 379 } 380 set_disk_ro(bdev->bd_disk, intval); 381 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); 382 dasd_put_device(base); 383 return rc; 384 } 385 386 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 387 struct cmbdata __user *argp) 388 { 389 size_t size = _IOC_SIZE(cmd); 390 struct cmbdata data; 391 int ret; 392 393 ret = cmf_readall(block->base->cdev, &data); 394 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 395 return -EFAULT; 396 return ret; 397 } 398 399 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 400 unsigned int cmd, unsigned long arg) 401 { 402 struct dasd_block *block; 403 struct dasd_device *base; 404 void __user *argp; 405 int rc; 406 407 if (is_compat_task()) 408 argp = compat_ptr(arg); 409 else 410 argp = (void __user *)arg; 411 412 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 413 PRINT_DEBUG("empty data ptr"); 414 return -EINVAL; 415 } 416 417 base = dasd_device_from_gendisk(bdev->bd_disk); 418 if (!base) 419 return -ENODEV; 420 block = base->block; 421 rc = 0; 422 switch (cmd) { 423 case BIODASDDISABLE: 424 rc = dasd_ioctl_disable(bdev); 425 break; 426 case BIODASDENABLE: 427 rc = dasd_ioctl_enable(bdev); 428 break; 429 case BIODASDQUIESCE: 430 rc = dasd_ioctl_quiesce(block); 431 break; 432 case BIODASDRESUME: 433 rc = dasd_ioctl_resume(block); 434 break; 435 case BIODASDFMT: 436 rc = dasd_ioctl_format(bdev, argp); 437 break; 438 case BIODASDINFO: 439 rc = dasd_ioctl_information(block, cmd, argp); 440 break; 441 case BIODASDINFO2: 442 rc = dasd_ioctl_information(block, cmd, argp); 443 break; 444 case BIODASDPRRD: 445 rc = dasd_ioctl_read_profile(block, argp); 446 break; 447 case BIODASDPRRST: 448 rc = dasd_ioctl_reset_profile(block); 449 break; 450 case BLKROSET: 451 rc = dasd_ioctl_set_ro(bdev, argp); 452 break; 453 case DASDAPIVER: 454 rc = dasd_ioctl_api_version(argp); 455 break; 456 case BIODASDCMFENABLE: 457 rc = enable_cmf(base->cdev); 458 break; 459 case BIODASDCMFDISABLE: 460 rc = disable_cmf(base->cdev); 461 break; 462 case BIODASDREADALLCMB: 463 rc = dasd_ioctl_readall_cmb(block, cmd, argp); 464 break; 465 default: 466 /* if the discipline has an ioctl method try it. */ 467 if (base->discipline->ioctl) { 468 rc = base->discipline->ioctl(block, cmd, argp); 469 if (rc == -ENOIOCTLCMD) 470 rc = -EINVAL; 471 } else 472 rc = -EINVAL; 473 } 474 dasd_put_device(base); 475 return rc; 476 } 477