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 #include <linux/config.h> 13 #include <linux/interrupt.h> 14 #include <linux/major.h> 15 #include <linux/fs.h> 16 #include <linux/blkpg.h> 17 18 #include <asm/ccwdev.h> 19 #include <asm/cmb.h> 20 #include <asm/uaccess.h> 21 22 /* This is ugly... */ 23 #define PRINTK_HEADER "dasd_ioctl:" 24 25 #include "dasd_int.h" 26 27 /* 28 * SECTION: ioctl functions. 29 */ 30 static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list); 31 32 /* 33 * Find the ioctl with number no. 34 */ 35 static struct dasd_ioctl * 36 dasd_find_ioctl(int no) 37 { 38 struct dasd_ioctl *ioctl; 39 40 list_for_each_entry (ioctl, &dasd_ioctl_list, list) 41 if (ioctl->no == no) 42 return ioctl; 43 return NULL; 44 } 45 46 /* 47 * Register ioctl with number no. 48 */ 49 int 50 dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler) 51 { 52 struct dasd_ioctl *new; 53 if (dasd_find_ioctl(no)) 54 return -EBUSY; 55 new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL); 56 if (new == NULL) 57 return -ENOMEM; 58 new->owner = owner; 59 new->no = no; 60 new->handler = handler; 61 list_add(&new->list, &dasd_ioctl_list); 62 return 0; 63 } 64 65 /* 66 * Deregister ioctl with number no. 67 */ 68 int 69 dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler) 70 { 71 struct dasd_ioctl *old = dasd_find_ioctl(no); 72 if (old == NULL) 73 return -ENOENT; 74 if (old->no != no || old->handler != handler || owner != old->owner) 75 return -EINVAL; 76 list_del(&old->list); 77 kfree(old); 78 return 0; 79 } 80 81 static int 82 dasd_ioctl_api_version(void __user *argp) 83 { 84 int ver = DASD_API_VERSION; 85 return put_user(ver, (int *)argp); 86 } 87 88 /* 89 * Enable device. 90 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection 91 */ 92 static int 93 dasd_ioctl_enable(struct block_device *bdev) 94 { 95 struct dasd_device *device = bdev->bd_disk->private_data; 96 97 if (!capable(CAP_SYS_ADMIN)) 98 return -EACCES; 99 100 dasd_enable_device(device); 101 /* Formatting the dasd device can change the capacity. */ 102 mutex_lock(&bdev->bd_mutex); 103 i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9); 104 mutex_unlock(&bdev->bd_mutex); 105 return 0; 106 } 107 108 /* 109 * Disable device. 110 * Used by dasdfmt. Disable I/O operations but allow ioctls. 111 */ 112 static int 113 dasd_ioctl_disable(struct block_device *bdev) 114 { 115 struct dasd_device *device = bdev->bd_disk->private_data; 116 117 if (!capable(CAP_SYS_ADMIN)) 118 return -EACCES; 119 120 /* 121 * Man this is sick. We don't do a real disable but only downgrade 122 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses 123 * BIODASDDISABLE to disable accesses to the device via the block 124 * device layer but it still wants to do i/o on the device by 125 * using the BIODASDFMT ioctl. Therefore the correct state for the 126 * device is DASD_STATE_BASIC that allows to do basic i/o. 127 */ 128 dasd_set_target_state(device, DASD_STATE_BASIC); 129 /* 130 * Set i_size to zero, since read, write, etc. check against this 131 * value. 132 */ 133 mutex_lock(&bdev->bd_mutex); 134 i_size_write(bdev->bd_inode, 0); 135 mutex_unlock(&bdev->bd_mutex); 136 return 0; 137 } 138 139 /* 140 * Quiesce device. 141 */ 142 static int 143 dasd_ioctl_quiesce(struct dasd_device *device) 144 { 145 unsigned long flags; 146 147 if (!capable (CAP_SYS_ADMIN)) 148 return -EACCES; 149 150 DEV_MESSAGE (KERN_DEBUG, device, "%s", 151 "Quiesce IO on device"); 152 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 153 device->stopped |= DASD_STOPPED_QUIESCE; 154 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 155 return 0; 156 } 157 158 159 /* 160 * Quiesce device. 161 */ 162 static int 163 dasd_ioctl_resume(struct dasd_device *device) 164 { 165 unsigned long flags; 166 167 if (!capable (CAP_SYS_ADMIN)) 168 return -EACCES; 169 170 DEV_MESSAGE (KERN_DEBUG, device, "%s", 171 "resume IO on device"); 172 173 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 174 device->stopped &= ~DASD_STOPPED_QUIESCE; 175 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 176 177 dasd_schedule_bh (device); 178 return 0; 179 } 180 181 /* 182 * performs formatting of _device_ according to _fdata_ 183 * Note: The discipline's format_function is assumed to deliver formatting 184 * commands to format a single unit of the device. In terms of the ECKD 185 * devices this means CCWs are generated to format a single track. 186 */ 187 static int 188 dasd_format(struct dasd_device * device, struct format_data_t * fdata) 189 { 190 struct dasd_ccw_req *cqr; 191 int rc; 192 193 if (device->discipline->format_device == NULL) 194 return -EPERM; 195 196 if (device->state != DASD_STATE_BASIC) { 197 DEV_MESSAGE(KERN_WARNING, device, "%s", 198 "dasd_format: device is not disabled! "); 199 return -EBUSY; 200 } 201 202 DBF_DEV_EVENT(DBF_NOTICE, device, 203 "formatting units %d to %d (%d B blocks) flags %d", 204 fdata->start_unit, 205 fdata->stop_unit, fdata->blksize, fdata->intensity); 206 207 /* Since dasdfmt keeps the device open after it was disabled, 208 * there still exists an inode for this device. 209 * We must update i_blkbits, otherwise we might get errors when 210 * enabling the device later. 211 */ 212 if (fdata->start_unit == 0) { 213 struct block_device *bdev = bdget_disk(device->gdp, 0); 214 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 215 bdput(bdev); 216 } 217 218 while (fdata->start_unit <= fdata->stop_unit) { 219 cqr = device->discipline->format_device(device, fdata); 220 if (IS_ERR(cqr)) 221 return PTR_ERR(cqr); 222 rc = dasd_sleep_on_interruptible(cqr); 223 dasd_sfree_request(cqr, cqr->device); 224 if (rc) { 225 if (rc != -ERESTARTSYS) 226 DEV_MESSAGE(KERN_ERR, device, 227 " Formatting of unit %d failed " 228 "with rc = %d", 229 fdata->start_unit, rc); 230 return rc; 231 } 232 fdata->start_unit++; 233 } 234 return 0; 235 } 236 237 /* 238 * Format device. 239 */ 240 static int 241 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 242 { 243 struct dasd_device *device = bdev->bd_disk->private_data; 244 struct format_data_t fdata; 245 246 if (!capable(CAP_SYS_ADMIN)) 247 return -EACCES; 248 if (!argp) 249 return -EINVAL; 250 251 if (device->features & DASD_FEATURE_READONLY) 252 return -EROFS; 253 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) 254 return -EFAULT; 255 if (bdev != bdev->bd_contains) { 256 DEV_MESSAGE(KERN_WARNING, device, "%s", 257 "Cannot low-level format a partition"); 258 return -EINVAL; 259 } 260 return dasd_format(device, &fdata); 261 } 262 263 #ifdef CONFIG_DASD_PROFILE 264 /* 265 * Reset device profile information 266 */ 267 static int 268 dasd_ioctl_reset_profile(struct dasd_device *device) 269 { 270 memset(&device->profile, 0, sizeof (struct dasd_profile_info_t)); 271 return 0; 272 } 273 274 /* 275 * Return device profile information 276 */ 277 static int 278 dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp) 279 { 280 if (dasd_profile_level == DASD_PROFILE_OFF) 281 return -EIO; 282 if (copy_to_user(argp, &device->profile, 283 sizeof (struct dasd_profile_info_t))) 284 return -EFAULT; 285 return 0; 286 } 287 #else 288 static int 289 dasd_ioctl_reset_profile(struct dasd_device *device) 290 { 291 return -ENOSYS; 292 } 293 294 static int 295 dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp) 296 { 297 return -ENOSYS; 298 } 299 #endif 300 301 /* 302 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 303 */ 304 static int 305 dasd_ioctl_information(struct dasd_device *device, 306 unsigned int cmd, void __user *argp) 307 { 308 struct dasd_information2_t *dasd_info; 309 unsigned long flags; 310 int rc; 311 struct ccw_device *cdev; 312 313 if (!device->discipline->fill_info) 314 return -EINVAL; 315 316 dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 317 if (dasd_info == NULL) 318 return -ENOMEM; 319 320 rc = device->discipline->fill_info(device, dasd_info); 321 if (rc) { 322 kfree(dasd_info); 323 return rc; 324 } 325 326 cdev = device->cdev; 327 328 dasd_info->devno = _ccw_device_get_device_number(device->cdev); 329 dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev); 330 dasd_info->cu_type = cdev->id.cu_type; 331 dasd_info->cu_model = cdev->id.cu_model; 332 dasd_info->dev_type = cdev->id.dev_type; 333 dasd_info->dev_model = cdev->id.dev_model; 334 dasd_info->status = device->state; 335 /* 336 * The open_count is increased for every opener, that includes 337 * the blkdev_get in dasd_scan_partitions. 338 * This must be hidden from user-space. 339 */ 340 dasd_info->open_count = atomic_read(&device->open_count); 341 if (!device->bdev) 342 dasd_info->open_count++; 343 344 /* 345 * check if device is really formatted 346 * LDL / CDL was returned by 'fill_info' 347 */ 348 if ((device->state < DASD_STATE_READY) || 349 (dasd_check_blocksize(device->bp_block))) 350 dasd_info->format = DASD_FORMAT_NONE; 351 352 dasd_info->features |= 353 ((device->features & DASD_FEATURE_READONLY) != 0); 354 355 if (device->discipline) 356 memcpy(dasd_info->type, device->discipline->name, 4); 357 else 358 memcpy(dasd_info->type, "none", 4); 359 dasd_info->req_queue_len = 0; 360 dasd_info->chanq_len = 0; 361 if (device->request_queue->request_fn) { 362 struct list_head *l; 363 #ifdef DASD_EXTENDED_PROFILING 364 { 365 struct list_head *l; 366 spin_lock_irqsave(&device->lock, flags); 367 list_for_each(l, &device->request_queue->queue_head) 368 dasd_info->req_queue_len++; 369 spin_unlock_irqrestore(&device->lock, flags); 370 } 371 #endif /* DASD_EXTENDED_PROFILING */ 372 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 373 list_for_each(l, &device->ccw_queue) 374 dasd_info->chanq_len++; 375 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), 376 flags); 377 } 378 379 rc = 0; 380 if (copy_to_user(argp, dasd_info, 381 ((cmd == (unsigned int) BIODASDINFO2) ? 382 sizeof (struct dasd_information2_t) : 383 sizeof (struct dasd_information_t)))) 384 rc = -EFAULT; 385 kfree(dasd_info); 386 return rc; 387 } 388 389 /* 390 * Set read only 391 */ 392 static int 393 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 394 { 395 struct dasd_device *device = bdev->bd_disk->private_data; 396 int intval; 397 398 if (!capable(CAP_SYS_ADMIN)) 399 return -EACCES; 400 if (bdev != bdev->bd_contains) 401 // ro setting is not allowed for partitions 402 return -EINVAL; 403 if (get_user(intval, (int *)argp)) 404 return -EFAULT; 405 406 set_disk_ro(bdev->bd_disk, intval); 407 return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval); 408 } 409 410 static int 411 dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd, 412 unsigned long arg) 413 { 414 struct cmbdata __user *argp = (void __user *) arg; 415 size_t size = _IOC_SIZE(cmd); 416 struct cmbdata data; 417 int ret; 418 419 ret = cmf_readall(device->cdev, &data); 420 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 421 return -EFAULT; 422 return ret; 423 } 424 425 int 426 dasd_ioctl(struct inode *inode, struct file *file, 427 unsigned int cmd, unsigned long arg) 428 { 429 struct block_device *bdev = inode->i_bdev; 430 struct dasd_device *device = bdev->bd_disk->private_data; 431 void __user *argp = (void __user *)arg; 432 struct dasd_ioctl *ioctl; 433 int rc; 434 435 if (!device) 436 return -ENODEV; 437 438 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 439 PRINT_DEBUG("empty data ptr"); 440 return -EINVAL; 441 } 442 443 switch (cmd) { 444 case BIODASDDISABLE: 445 return dasd_ioctl_disable(bdev); 446 case BIODASDENABLE: 447 return dasd_ioctl_enable(bdev); 448 case BIODASDQUIESCE: 449 return dasd_ioctl_quiesce(device); 450 case BIODASDRESUME: 451 return dasd_ioctl_resume(device); 452 case BIODASDFMT: 453 return dasd_ioctl_format(bdev, argp); 454 case BIODASDINFO: 455 return dasd_ioctl_information(device, cmd, argp); 456 case BIODASDINFO2: 457 return dasd_ioctl_information(device, cmd, argp); 458 case BIODASDPRRD: 459 return dasd_ioctl_read_profile(device, argp); 460 case BIODASDPRRST: 461 return dasd_ioctl_reset_profile(device); 462 case BLKROSET: 463 return dasd_ioctl_set_ro(bdev, argp); 464 case DASDAPIVER: 465 return dasd_ioctl_api_version(argp); 466 case BIODASDCMFENABLE: 467 return enable_cmf(device->cdev); 468 case BIODASDCMFDISABLE: 469 return disable_cmf(device->cdev); 470 case BIODASDREADALLCMB: 471 return dasd_ioctl_readall_cmb(device, cmd, arg); 472 default: 473 /* if the discipline has an ioctl method try it. */ 474 if (device->discipline->ioctl) { 475 int rval = device->discipline->ioctl(device, cmd, argp); 476 if (rval != -ENOIOCTLCMD) 477 return rval; 478 } 479 480 /* else resort to the deprecated dynamic ioctl list */ 481 list_for_each_entry(ioctl, &dasd_ioctl_list, list) { 482 if (ioctl->no == cmd) { 483 /* Found a matching ioctl. Call it. */ 484 if (!try_module_get(ioctl->owner)) 485 continue; 486 rc = ioctl->handler(bdev, cmd, arg); 487 module_put(ioctl->owner); 488 return rc; 489 } 490 } 491 return -EINVAL; 492 } 493 } 494 495 long 496 dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 497 { 498 int rval; 499 500 lock_kernel(); 501 rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg); 502 unlock_kernel(); 503 504 return (rval == -EINVAL) ? -ENOIOCTLCMD : rval; 505 } 506 507 EXPORT_SYMBOL(dasd_ioctl_no_register); 508 EXPORT_SYMBOL(dasd_ioctl_no_unregister); 509