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