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/smp_lock.h> 20 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_block *block = bdev->bd_disk->private_data; 46 47 if (!capable(CAP_SYS_ADMIN)) 48 return -EACCES; 49 50 dasd_enable_device(block->base); 51 /* Formatting the dasd device can change the capacity. */ 52 mutex_lock(&bdev->bd_mutex); 53 i_size_write(bdev->bd_inode, (loff_t)get_capacity(block->gdp) << 9); 54 mutex_unlock(&bdev->bd_mutex); 55 return 0; 56 } 57 58 /* 59 * Disable device. 60 * Used by dasdfmt. Disable I/O operations but allow ioctls. 61 */ 62 static int 63 dasd_ioctl_disable(struct block_device *bdev) 64 { 65 struct dasd_block *block = bdev->bd_disk->private_data; 66 67 if (!capable(CAP_SYS_ADMIN)) 68 return -EACCES; 69 70 /* 71 * Man this is sick. We don't do a real disable but only downgrade 72 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses 73 * BIODASDDISABLE to disable accesses to the device via the block 74 * device layer but it still wants to do i/o on the device by 75 * using the BIODASDFMT ioctl. Therefore the correct state for the 76 * device is DASD_STATE_BASIC that allows to do basic i/o. 77 */ 78 dasd_set_target_state(block->base, DASD_STATE_BASIC); 79 /* 80 * Set i_size to zero, since read, write, etc. check against this 81 * value. 82 */ 83 mutex_lock(&bdev->bd_mutex); 84 i_size_write(bdev->bd_inode, 0); 85 mutex_unlock(&bdev->bd_mutex); 86 return 0; 87 } 88 89 /* 90 * Quiesce device. 91 */ 92 static int dasd_ioctl_quiesce(struct dasd_block *block) 93 { 94 unsigned long flags; 95 struct dasd_device *base; 96 97 base = block->base; 98 if (!capable (CAP_SYS_ADMIN)) 99 return -EACCES; 100 101 pr_info("%s: The DASD has been put in the quiesce " 102 "state\n", dev_name(&base->cdev->dev)); 103 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 104 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 105 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 106 return 0; 107 } 108 109 110 /* 111 * Resume device. 112 */ 113 static int dasd_ioctl_resume(struct dasd_block *block) 114 { 115 unsigned long flags; 116 struct dasd_device *base; 117 118 base = block->base; 119 if (!capable (CAP_SYS_ADMIN)) 120 return -EACCES; 121 122 pr_info("%s: I/O operations have been resumed " 123 "on the DASD\n", dev_name(&base->cdev->dev)); 124 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 125 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); 126 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 127 128 dasd_schedule_block_bh(block); 129 return 0; 130 } 131 132 /* 133 * performs formatting of _device_ according to _fdata_ 134 * Note: The discipline's format_function is assumed to deliver formatting 135 * commands to format a single unit of the device. In terms of the ECKD 136 * devices this means CCWs are generated to format a single track. 137 */ 138 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) 139 { 140 struct dasd_ccw_req *cqr; 141 struct dasd_device *base; 142 int rc; 143 144 base = block->base; 145 if (base->discipline->format_device == NULL) 146 return -EPERM; 147 148 if (base->state != DASD_STATE_BASIC) { 149 pr_warning("%s: The DASD cannot be formatted while it is " 150 "enabled\n", dev_name(&base->cdev->dev)); 151 return -EBUSY; 152 } 153 154 DBF_DEV_EVENT(DBF_NOTICE, base, 155 "formatting units %u to %u (%u B blocks) flags %u", 156 fdata->start_unit, 157 fdata->stop_unit, fdata->blksize, fdata->intensity); 158 159 /* Since dasdfmt keeps the device open after it was disabled, 160 * there still exists an inode for this device. 161 * We must update i_blkbits, otherwise we might get errors when 162 * enabling the device later. 163 */ 164 if (fdata->start_unit == 0) { 165 struct block_device *bdev = bdget_disk(block->gdp, 0); 166 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 167 bdput(bdev); 168 } 169 170 while (fdata->start_unit <= fdata->stop_unit) { 171 cqr = base->discipline->format_device(base, fdata); 172 if (IS_ERR(cqr)) 173 return PTR_ERR(cqr); 174 rc = dasd_sleep_on_interruptible(cqr); 175 dasd_sfree_request(cqr, cqr->memdev); 176 if (rc) { 177 if (rc != -ERESTARTSYS) 178 pr_err("%s: Formatting unit %d failed with " 179 "rc=%d\n", dev_name(&base->cdev->dev), 180 fdata->start_unit, rc); 181 return rc; 182 } 183 fdata->start_unit++; 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_block *block = bdev->bd_disk->private_data; 195 struct format_data_t fdata; 196 197 if (!capable(CAP_SYS_ADMIN)) 198 return -EACCES; 199 if (!argp) 200 return -EINVAL; 201 202 if (block->base->features & DASD_FEATURE_READONLY) 203 return -EROFS; 204 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) 205 return -EFAULT; 206 if (bdev != bdev->bd_contains) { 207 pr_warning("%s: The specified DASD is a partition and cannot " 208 "be formatted\n", 209 dev_name(&block->base->cdev->dev)); 210 return -EINVAL; 211 } 212 return dasd_format(block, &fdata); 213 } 214 215 #ifdef CONFIG_DASD_PROFILE 216 /* 217 * Reset device profile information 218 */ 219 static int dasd_ioctl_reset_profile(struct dasd_block *block) 220 { 221 memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); 222 return 0; 223 } 224 225 /* 226 * Return device profile information 227 */ 228 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 229 { 230 if (dasd_profile_level == DASD_PROFILE_OFF) 231 return -EIO; 232 if (copy_to_user(argp, &block->profile, 233 sizeof(struct dasd_profile_info_t))) 234 return -EFAULT; 235 return 0; 236 } 237 #else 238 static int dasd_ioctl_reset_profile(struct dasd_block *block) 239 { 240 return -ENOSYS; 241 } 242 243 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 244 { 245 return -ENOSYS; 246 } 247 #endif 248 249 /* 250 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 251 */ 252 static int dasd_ioctl_information(struct dasd_block *block, 253 unsigned int cmd, void __user *argp) 254 { 255 struct dasd_information2_t *dasd_info; 256 unsigned long flags; 257 int rc; 258 struct dasd_device *base; 259 struct ccw_device *cdev; 260 struct ccw_dev_id dev_id; 261 262 base = block->base; 263 if (!base->discipline->fill_info) 264 return -EINVAL; 265 266 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 267 if (dasd_info == NULL) 268 return -ENOMEM; 269 270 rc = base->discipline->fill_info(base, dasd_info); 271 if (rc) { 272 kfree(dasd_info); 273 return rc; 274 } 275 276 cdev = base->cdev; 277 ccw_device_get_id(cdev, &dev_id); 278 279 dasd_info->devno = dev_id.devno; 280 dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); 281 dasd_info->cu_type = cdev->id.cu_type; 282 dasd_info->cu_model = cdev->id.cu_model; 283 dasd_info->dev_type = cdev->id.dev_type; 284 dasd_info->dev_model = cdev->id.dev_model; 285 dasd_info->status = base->state; 286 /* 287 * The open_count is increased for every opener, that includes 288 * the blkdev_get in dasd_scan_partitions. 289 * This must be hidden from user-space. 290 */ 291 dasd_info->open_count = atomic_read(&block->open_count); 292 if (!block->bdev) 293 dasd_info->open_count++; 294 295 /* 296 * check if device is really formatted 297 * LDL / CDL was returned by 'fill_info' 298 */ 299 if ((base->state < DASD_STATE_READY) || 300 (dasd_check_blocksize(block->bp_block))) 301 dasd_info->format = DASD_FORMAT_NONE; 302 303 dasd_info->features |= 304 ((base->features & DASD_FEATURE_READONLY) != 0); 305 306 if (base->discipline) 307 memcpy(dasd_info->type, base->discipline->name, 4); 308 else 309 memcpy(dasd_info->type, "none", 4); 310 311 if (block->request_queue->request_fn) { 312 struct list_head *l; 313 #ifdef DASD_EXTENDED_PROFILING 314 { 315 struct list_head *l; 316 spin_lock_irqsave(&block->lock, flags); 317 list_for_each(l, &block->request_queue->queue_head) 318 dasd_info->req_queue_len++; 319 spin_unlock_irqrestore(&block->lock, flags); 320 } 321 #endif /* DASD_EXTENDED_PROFILING */ 322 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 323 list_for_each(l, &base->ccw_queue) 324 dasd_info->chanq_len++; 325 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 326 flags); 327 } 328 329 rc = 0; 330 if (copy_to_user(argp, dasd_info, 331 ((cmd == (unsigned int) BIODASDINFO2) ? 332 sizeof(struct dasd_information2_t) : 333 sizeof(struct dasd_information_t)))) 334 rc = -EFAULT; 335 kfree(dasd_info); 336 return rc; 337 } 338 339 /* 340 * Set read only 341 */ 342 static int 343 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 344 { 345 struct dasd_block *block = bdev->bd_disk->private_data; 346 int intval; 347 348 if (!capable(CAP_SYS_ADMIN)) 349 return -EACCES; 350 if (bdev != bdev->bd_contains) 351 // ro setting is not allowed for partitions 352 return -EINVAL; 353 if (get_user(intval, (int __user *)argp)) 354 return -EFAULT; 355 356 set_disk_ro(bdev->bd_disk, intval); 357 return dasd_set_feature(block->base->cdev, DASD_FEATURE_READONLY, intval); 358 } 359 360 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, 361 unsigned long arg) 362 { 363 struct cmbdata __user *argp = (void __user *) arg; 364 size_t size = _IOC_SIZE(cmd); 365 struct cmbdata data; 366 int ret; 367 368 ret = cmf_readall(block->base->cdev, &data); 369 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 370 return -EFAULT; 371 return ret; 372 } 373 374 static int 375 dasd_do_ioctl(struct block_device *bdev, fmode_t mode, 376 unsigned int cmd, unsigned long arg) 377 { 378 struct dasd_block *block = bdev->bd_disk->private_data; 379 void __user *argp = (void __user *)arg; 380 381 if (!block) 382 return -ENODEV; 383 384 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 385 PRINT_DEBUG("empty data ptr"); 386 return -EINVAL; 387 } 388 389 switch (cmd) { 390 case BIODASDDISABLE: 391 return dasd_ioctl_disable(bdev); 392 case BIODASDENABLE: 393 return dasd_ioctl_enable(bdev); 394 case BIODASDQUIESCE: 395 return dasd_ioctl_quiesce(block); 396 case BIODASDRESUME: 397 return dasd_ioctl_resume(block); 398 case BIODASDFMT: 399 return dasd_ioctl_format(bdev, argp); 400 case BIODASDINFO: 401 return dasd_ioctl_information(block, cmd, argp); 402 case BIODASDINFO2: 403 return dasd_ioctl_information(block, cmd, argp); 404 case BIODASDPRRD: 405 return dasd_ioctl_read_profile(block, argp); 406 case BIODASDPRRST: 407 return dasd_ioctl_reset_profile(block); 408 case BLKROSET: 409 return dasd_ioctl_set_ro(bdev, argp); 410 case DASDAPIVER: 411 return dasd_ioctl_api_version(argp); 412 case BIODASDCMFENABLE: 413 return enable_cmf(block->base->cdev); 414 case BIODASDCMFDISABLE: 415 return disable_cmf(block->base->cdev); 416 case BIODASDREADALLCMB: 417 return dasd_ioctl_readall_cmb(block, cmd, arg); 418 default: 419 /* if the discipline has an ioctl method try it. */ 420 if (block->base->discipline->ioctl) { 421 int rval = block->base->discipline->ioctl(block, cmd, argp); 422 if (rval != -ENOIOCTLCMD) 423 return rval; 424 } 425 426 return -EINVAL; 427 } 428 } 429 430 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 431 unsigned int cmd, unsigned long arg) 432 { 433 int rc; 434 435 lock_kernel(); 436 rc = dasd_do_ioctl(bdev, mode, cmd, arg); 437 unlock_kernel(); 438 return rc; 439 } 440