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