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 #include <linux/slab.h> 21 #include <asm/compat.h> 22 #include <asm/ccwdev.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_block *block = bdev->bd_disk->private_data; 47 48 if (!capable(CAP_SYS_ADMIN)) 49 return -EACCES; 50 51 dasd_enable_device(block->base); 52 /* Formatting the dasd device can change the capacity. */ 53 mutex_lock(&bdev->bd_mutex); 54 i_size_write(bdev->bd_inode, (loff_t)get_capacity(block->gdp) << 9); 55 mutex_unlock(&bdev->bd_mutex); 56 return 0; 57 } 58 59 /* 60 * Disable device. 61 * Used by dasdfmt. Disable I/O operations but allow ioctls. 62 */ 63 static int 64 dasd_ioctl_disable(struct block_device *bdev) 65 { 66 struct dasd_block *block = bdev->bd_disk->private_data; 67 68 if (!capable(CAP_SYS_ADMIN)) 69 return -EACCES; 70 71 /* 72 * Man this is sick. We don't do a real disable but only downgrade 73 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses 74 * BIODASDDISABLE to disable accesses to the device via the block 75 * device layer but it still wants to do i/o on the device by 76 * using the BIODASDFMT ioctl. Therefore the correct state for the 77 * device is DASD_STATE_BASIC that allows to do basic i/o. 78 */ 79 dasd_set_target_state(block->base, DASD_STATE_BASIC); 80 /* 81 * Set i_size to zero, since read, write, etc. check against this 82 * value. 83 */ 84 mutex_lock(&bdev->bd_mutex); 85 i_size_write(bdev->bd_inode, 0); 86 mutex_unlock(&bdev->bd_mutex); 87 return 0; 88 } 89 90 /* 91 * Quiesce device. 92 */ 93 static int dasd_ioctl_quiesce(struct dasd_block *block) 94 { 95 unsigned long flags; 96 struct dasd_device *base; 97 98 base = block->base; 99 if (!capable (CAP_SYS_ADMIN)) 100 return -EACCES; 101 102 pr_info("%s: The DASD has been put in the quiesce " 103 "state\n", dev_name(&base->cdev->dev)); 104 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 105 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); 106 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 107 return 0; 108 } 109 110 111 /* 112 * Resume device. 113 */ 114 static int dasd_ioctl_resume(struct dasd_block *block) 115 { 116 unsigned long flags; 117 struct dasd_device *base; 118 119 base = block->base; 120 if (!capable (CAP_SYS_ADMIN)) 121 return -EACCES; 122 123 pr_info("%s: I/O operations have been resumed " 124 "on the DASD\n", dev_name(&base->cdev->dev)); 125 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 126 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); 127 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); 128 129 dasd_schedule_block_bh(block); 130 return 0; 131 } 132 133 /* 134 * performs formatting of _device_ according to _fdata_ 135 * Note: The discipline's format_function is assumed to deliver formatting 136 * commands to format a single unit of the device. In terms of the ECKD 137 * devices this means CCWs are generated to format a single track. 138 */ 139 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) 140 { 141 struct dasd_ccw_req *cqr; 142 struct dasd_device *base; 143 int rc; 144 145 base = block->base; 146 if (base->discipline->format_device == NULL) 147 return -EPERM; 148 149 if (base->state != DASD_STATE_BASIC) { 150 pr_warning("%s: The DASD cannot be formatted while it is " 151 "enabled\n", dev_name(&base->cdev->dev)); 152 return -EBUSY; 153 } 154 155 DBF_DEV_EVENT(DBF_NOTICE, base, 156 "formatting units %u to %u (%u B blocks) flags %u", 157 fdata->start_unit, 158 fdata->stop_unit, fdata->blksize, fdata->intensity); 159 160 /* Since dasdfmt keeps the device open after it was disabled, 161 * there still exists an inode for this device. 162 * We must update i_blkbits, otherwise we might get errors when 163 * enabling the device later. 164 */ 165 if (fdata->start_unit == 0) { 166 struct block_device *bdev = bdget_disk(block->gdp, 0); 167 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); 168 bdput(bdev); 169 } 170 171 while (fdata->start_unit <= fdata->stop_unit) { 172 cqr = base->discipline->format_device(base, fdata); 173 if (IS_ERR(cqr)) 174 return PTR_ERR(cqr); 175 rc = dasd_sleep_on_interruptible(cqr); 176 dasd_sfree_request(cqr, cqr->memdev); 177 if (rc) { 178 if (rc != -ERESTARTSYS) 179 pr_err("%s: Formatting unit %d failed with " 180 "rc=%d\n", dev_name(&base->cdev->dev), 181 fdata->start_unit, rc); 182 return rc; 183 } 184 fdata->start_unit++; 185 } 186 return 0; 187 } 188 189 /* 190 * Format device. 191 */ 192 static int 193 dasd_ioctl_format(struct block_device *bdev, void __user *argp) 194 { 195 struct dasd_block *block = bdev->bd_disk->private_data; 196 struct format_data_t fdata; 197 198 if (!capable(CAP_SYS_ADMIN)) 199 return -EACCES; 200 if (!argp) 201 return -EINVAL; 202 203 if (block->base->features & DASD_FEATURE_READONLY || 204 test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags)) 205 return -EROFS; 206 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) 207 return -EFAULT; 208 if (bdev != bdev->bd_contains) { 209 pr_warning("%s: The specified DASD is a partition and cannot " 210 "be formatted\n", 211 dev_name(&block->base->cdev->dev)); 212 return -EINVAL; 213 } 214 return dasd_format(block, &fdata); 215 } 216 217 #ifdef CONFIG_DASD_PROFILE 218 /* 219 * Reset device profile information 220 */ 221 static int dasd_ioctl_reset_profile(struct dasd_block *block) 222 { 223 memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); 224 return 0; 225 } 226 227 /* 228 * Return device profile information 229 */ 230 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 231 { 232 if (dasd_profile_level == DASD_PROFILE_OFF) 233 return -EIO; 234 if (copy_to_user(argp, &block->profile, 235 sizeof(struct dasd_profile_info_t))) 236 return -EFAULT; 237 return 0; 238 } 239 #else 240 static int dasd_ioctl_reset_profile(struct dasd_block *block) 241 { 242 return -ENOSYS; 243 } 244 245 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 246 { 247 return -ENOSYS; 248 } 249 #endif 250 251 /* 252 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 253 */ 254 static int dasd_ioctl_information(struct dasd_block *block, 255 unsigned int cmd, void __user *argp) 256 { 257 struct dasd_information2_t *dasd_info; 258 unsigned long flags; 259 int rc; 260 struct dasd_device *base; 261 struct ccw_device *cdev; 262 struct ccw_dev_id dev_id; 263 264 base = block->base; 265 if (!base->discipline || !base->discipline->fill_info) 266 return -EINVAL; 267 268 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 269 if (dasd_info == NULL) 270 return -ENOMEM; 271 272 rc = base->discipline->fill_info(base, dasd_info); 273 if (rc) { 274 kfree(dasd_info); 275 return rc; 276 } 277 278 cdev = base->cdev; 279 ccw_device_get_id(cdev, &dev_id); 280 281 dasd_info->devno = dev_id.devno; 282 dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); 283 dasd_info->cu_type = cdev->id.cu_type; 284 dasd_info->cu_model = cdev->id.cu_model; 285 dasd_info->dev_type = cdev->id.dev_type; 286 dasd_info->dev_model = cdev->id.dev_model; 287 dasd_info->status = base->state; 288 /* 289 * The open_count is increased for every opener, that includes 290 * the blkdev_get in dasd_scan_partitions. 291 * This must be hidden from user-space. 292 */ 293 dasd_info->open_count = atomic_read(&block->open_count); 294 if (!block->bdev) 295 dasd_info->open_count++; 296 297 /* 298 * check if device is really formatted 299 * LDL / CDL was returned by 'fill_info' 300 */ 301 if ((base->state < DASD_STATE_READY) || 302 (dasd_check_blocksize(block->bp_block))) 303 dasd_info->format = DASD_FORMAT_NONE; 304 305 dasd_info->features |= 306 ((base->features & DASD_FEATURE_READONLY) != 0); 307 308 memcpy(dasd_info->type, base->discipline->name, 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 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags)) 355 return -EROFS; 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 struct cmbdata __user *argp) 362 { 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; 379 380 if (is_compat_task()) 381 argp = compat_ptr(arg); 382 else 383 argp = (void __user *)arg; 384 385 if (!block) 386 return -ENODEV; 387 388 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 389 PRINT_DEBUG("empty data ptr"); 390 return -EINVAL; 391 } 392 393 switch (cmd) { 394 case BIODASDDISABLE: 395 return dasd_ioctl_disable(bdev); 396 case BIODASDENABLE: 397 return dasd_ioctl_enable(bdev); 398 case BIODASDQUIESCE: 399 return dasd_ioctl_quiesce(block); 400 case BIODASDRESUME: 401 return dasd_ioctl_resume(block); 402 case BIODASDFMT: 403 return dasd_ioctl_format(bdev, argp); 404 case BIODASDINFO: 405 return dasd_ioctl_information(block, cmd, argp); 406 case BIODASDINFO2: 407 return dasd_ioctl_information(block, cmd, argp); 408 case BIODASDPRRD: 409 return dasd_ioctl_read_profile(block, argp); 410 case BIODASDPRRST: 411 return dasd_ioctl_reset_profile(block); 412 case BLKROSET: 413 return dasd_ioctl_set_ro(bdev, argp); 414 case DASDAPIVER: 415 return dasd_ioctl_api_version(argp); 416 case BIODASDCMFENABLE: 417 return enable_cmf(block->base->cdev); 418 case BIODASDCMFDISABLE: 419 return disable_cmf(block->base->cdev); 420 case BIODASDREADALLCMB: 421 return dasd_ioctl_readall_cmb(block, cmd, argp); 422 default: 423 /* if the discipline has an ioctl method try it. */ 424 if (block->base->discipline->ioctl) { 425 int rval = block->base->discipline->ioctl(block, cmd, argp); 426 if (rval != -ENOIOCTLCMD) 427 return rval; 428 } 429 430 return -EINVAL; 431 } 432 } 433 434 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 435 unsigned int cmd, unsigned long arg) 436 { 437 int rc; 438 439 lock_kernel(); 440 rc = dasd_do_ioctl(bdev, mode, cmd, arg); 441 unlock_kernel(); 442 return rc; 443 } 444