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_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 test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags)) 204 return -EROFS; 205 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) 206 return -EFAULT; 207 if (bdev != bdev->bd_contains) { 208 pr_warning("%s: The specified DASD is a partition and cannot " 209 "be formatted\n", 210 dev_name(&block->base->cdev->dev)); 211 return -EINVAL; 212 } 213 return dasd_format(block, &fdata); 214 } 215 216 #ifdef CONFIG_DASD_PROFILE 217 /* 218 * Reset device profile information 219 */ 220 static int dasd_ioctl_reset_profile(struct dasd_block *block) 221 { 222 memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); 223 return 0; 224 } 225 226 /* 227 * Return device profile information 228 */ 229 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 230 { 231 if (dasd_profile_level == DASD_PROFILE_OFF) 232 return -EIO; 233 if (copy_to_user(argp, &block->profile, 234 sizeof(struct dasd_profile_info_t))) 235 return -EFAULT; 236 return 0; 237 } 238 #else 239 static int dasd_ioctl_reset_profile(struct dasd_block *block) 240 { 241 return -ENOSYS; 242 } 243 244 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) 245 { 246 return -ENOSYS; 247 } 248 #endif 249 250 /* 251 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 252 */ 253 static int dasd_ioctl_information(struct dasd_block *block, 254 unsigned int cmd, void __user *argp) 255 { 256 struct dasd_information2_t *dasd_info; 257 unsigned long flags; 258 int rc; 259 struct dasd_device *base; 260 struct ccw_device *cdev; 261 struct ccw_dev_id dev_id; 262 263 base = block->base; 264 if (!base->discipline || !base->discipline->fill_info) 265 return -EINVAL; 266 267 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 268 if (dasd_info == NULL) 269 return -ENOMEM; 270 271 rc = base->discipline->fill_info(base, dasd_info); 272 if (rc) { 273 kfree(dasd_info); 274 return rc; 275 } 276 277 cdev = base->cdev; 278 ccw_device_get_id(cdev, &dev_id); 279 280 dasd_info->devno = dev_id.devno; 281 dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); 282 dasd_info->cu_type = cdev->id.cu_type; 283 dasd_info->cu_model = cdev->id.cu_model; 284 dasd_info->dev_type = cdev->id.dev_type; 285 dasd_info->dev_model = cdev->id.dev_model; 286 dasd_info->status = base->state; 287 /* 288 * The open_count is increased for every opener, that includes 289 * the blkdev_get in dasd_scan_partitions. 290 * This must be hidden from user-space. 291 */ 292 dasd_info->open_count = atomic_read(&block->open_count); 293 if (!block->bdev) 294 dasd_info->open_count++; 295 296 /* 297 * check if device is really formatted 298 * LDL / CDL was returned by 'fill_info' 299 */ 300 if ((base->state < DASD_STATE_READY) || 301 (dasd_check_blocksize(block->bp_block))) 302 dasd_info->format = DASD_FORMAT_NONE; 303 304 dasd_info->features |= 305 ((base->features & DASD_FEATURE_READONLY) != 0); 306 307 memcpy(dasd_info->type, base->discipline->name, 4); 308 309 if (block->request_queue->request_fn) { 310 struct list_head *l; 311 #ifdef DASD_EXTENDED_PROFILING 312 { 313 struct list_head *l; 314 spin_lock_irqsave(&block->lock, flags); 315 list_for_each(l, &block->request_queue->queue_head) 316 dasd_info->req_queue_len++; 317 spin_unlock_irqrestore(&block->lock, flags); 318 } 319 #endif /* DASD_EXTENDED_PROFILING */ 320 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); 321 list_for_each(l, &base->ccw_queue) 322 dasd_info->chanq_len++; 323 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), 324 flags); 325 } 326 327 rc = 0; 328 if (copy_to_user(argp, dasd_info, 329 ((cmd == (unsigned int) BIODASDINFO2) ? 330 sizeof(struct dasd_information2_t) : 331 sizeof(struct dasd_information_t)))) 332 rc = -EFAULT; 333 kfree(dasd_info); 334 return rc; 335 } 336 337 /* 338 * Set read only 339 */ 340 static int 341 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 342 { 343 struct dasd_block *block = bdev->bd_disk->private_data; 344 int intval; 345 346 if (!capable(CAP_SYS_ADMIN)) 347 return -EACCES; 348 if (bdev != bdev->bd_contains) 349 // ro setting is not allowed for partitions 350 return -EINVAL; 351 if (get_user(intval, (int __user *)argp)) 352 return -EFAULT; 353 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags)) 354 return -EROFS; 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 struct cmbdata __user *argp) 361 { 362 size_t size = _IOC_SIZE(cmd); 363 struct cmbdata data; 364 int ret; 365 366 ret = cmf_readall(block->base->cdev, &data); 367 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 368 return -EFAULT; 369 return ret; 370 } 371 372 int dasd_ioctl(struct block_device *bdev, fmode_t mode, 373 unsigned int cmd, unsigned long arg) 374 { 375 struct dasd_block *block = bdev->bd_disk->private_data; 376 void __user *argp; 377 378 if (is_compat_task()) 379 argp = compat_ptr(arg); 380 else 381 argp = (void __user *)arg; 382 383 if (!block) 384 return -ENODEV; 385 386 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 387 PRINT_DEBUG("empty data ptr"); 388 return -EINVAL; 389 } 390 391 switch (cmd) { 392 case BIODASDDISABLE: 393 return dasd_ioctl_disable(bdev); 394 case BIODASDENABLE: 395 return dasd_ioctl_enable(bdev); 396 case BIODASDQUIESCE: 397 return dasd_ioctl_quiesce(block); 398 case BIODASDRESUME: 399 return dasd_ioctl_resume(block); 400 case BIODASDFMT: 401 return dasd_ioctl_format(bdev, argp); 402 case BIODASDINFO: 403 return dasd_ioctl_information(block, cmd, argp); 404 case BIODASDINFO2: 405 return dasd_ioctl_information(block, cmd, argp); 406 case BIODASDPRRD: 407 return dasd_ioctl_read_profile(block, argp); 408 case BIODASDPRRST: 409 return dasd_ioctl_reset_profile(block); 410 case BLKROSET: 411 return dasd_ioctl_set_ro(bdev, argp); 412 case DASDAPIVER: 413 return dasd_ioctl_api_version(argp); 414 case BIODASDCMFENABLE: 415 return enable_cmf(block->base->cdev); 416 case BIODASDCMFDISABLE: 417 return disable_cmf(block->base->cdev); 418 case BIODASDREADALLCMB: 419 return dasd_ioctl_readall_cmb(block, cmd, argp); 420 default: 421 /* if the discipline has an ioctl method try it. */ 422 if (block->base->discipline->ioctl) { 423 int rval = block->base->discipline->ioctl(block, cmd, argp); 424 if (rval != -ENOIOCTLCMD) 425 return rval; 426 } 427 428 return -EINVAL; 429 } 430 } 431