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_device *device = bdev->bd_disk->private_data; 42 43 if (!capable(CAP_SYS_ADMIN)) 44 return -EACCES; 45 46 dasd_enable_device(device); 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(device->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_device *device = 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(device, 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 89 dasd_ioctl_quiesce(struct dasd_device *device) 90 { 91 unsigned long flags; 92 93 if (!capable (CAP_SYS_ADMIN)) 94 return -EACCES; 95 96 DEV_MESSAGE (KERN_DEBUG, device, "%s", 97 "Quiesce IO on device"); 98 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 99 device->stopped |= DASD_STOPPED_QUIESCE; 100 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 101 return 0; 102 } 103 104 105 /* 106 * Quiesce device. 107 */ 108 static int 109 dasd_ioctl_resume(struct dasd_device *device) 110 { 111 unsigned long flags; 112 113 if (!capable (CAP_SYS_ADMIN)) 114 return -EACCES; 115 116 DEV_MESSAGE (KERN_DEBUG, device, "%s", 117 "resume IO on device"); 118 119 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 120 device->stopped &= ~DASD_STOPPED_QUIESCE; 121 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 122 123 dasd_schedule_bh (device); 124 return 0; 125 } 126 127 /* 128 * performs formatting of _device_ according to _fdata_ 129 * Note: The discipline's format_function is assumed to deliver formatting 130 * commands to format a single unit of the device. In terms of the ECKD 131 * devices this means CCWs are generated to format a single track. 132 */ 133 static int 134 dasd_format(struct dasd_device * device, struct format_data_t * fdata) 135 { 136 struct dasd_ccw_req *cqr; 137 int rc; 138 139 if (device->discipline->format_device == NULL) 140 return -EPERM; 141 142 if (device->state != DASD_STATE_BASIC) { 143 DEV_MESSAGE(KERN_WARNING, device, "%s", 144 "dasd_format: device is not disabled! "); 145 return -EBUSY; 146 } 147 148 DBF_DEV_EVENT(DBF_NOTICE, device, 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(device->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 = device->discipline->format_device(device, fdata); 166 if (IS_ERR(cqr)) 167 return PTR_ERR(cqr); 168 rc = dasd_sleep_on_interruptible(cqr); 169 dasd_sfree_request(cqr, cqr->device); 170 if (rc) { 171 if (rc != -ERESTARTSYS) 172 DEV_MESSAGE(KERN_ERR, device, 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_device *device = 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 (device->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, device, "%s", 203 "Cannot low-level format a partition"); 204 return -EINVAL; 205 } 206 return dasd_format(device, &fdata); 207 } 208 209 #ifdef CONFIG_DASD_PROFILE 210 /* 211 * Reset device profile information 212 */ 213 static int 214 dasd_ioctl_reset_profile(struct dasd_device *device) 215 { 216 memset(&device->profile, 0, sizeof (struct dasd_profile_info_t)); 217 return 0; 218 } 219 220 /* 221 * Return device profile information 222 */ 223 static int 224 dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp) 225 { 226 if (dasd_profile_level == DASD_PROFILE_OFF) 227 return -EIO; 228 if (copy_to_user(argp, &device->profile, 229 sizeof (struct dasd_profile_info_t))) 230 return -EFAULT; 231 return 0; 232 } 233 #else 234 static int 235 dasd_ioctl_reset_profile(struct dasd_device *device) 236 { 237 return -ENOSYS; 238 } 239 240 static int 241 dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp) 242 { 243 return -ENOSYS; 244 } 245 #endif 246 247 /* 248 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. 249 */ 250 static int 251 dasd_ioctl_information(struct dasd_device *device, 252 unsigned int cmd, void __user *argp) 253 { 254 struct dasd_information2_t *dasd_info; 255 unsigned long flags; 256 int rc; 257 struct ccw_device *cdev; 258 259 if (!device->discipline->fill_info) 260 return -EINVAL; 261 262 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 263 if (dasd_info == NULL) 264 return -ENOMEM; 265 266 rc = device->discipline->fill_info(device, dasd_info); 267 if (rc) { 268 kfree(dasd_info); 269 return rc; 270 } 271 272 cdev = device->cdev; 273 274 dasd_info->devno = _ccw_device_get_device_number(device->cdev); 275 dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev); 276 dasd_info->cu_type = cdev->id.cu_type; 277 dasd_info->cu_model = cdev->id.cu_model; 278 dasd_info->dev_type = cdev->id.dev_type; 279 dasd_info->dev_model = cdev->id.dev_model; 280 dasd_info->status = device->state; 281 /* 282 * The open_count is increased for every opener, that includes 283 * the blkdev_get in dasd_scan_partitions. 284 * This must be hidden from user-space. 285 */ 286 dasd_info->open_count = atomic_read(&device->open_count); 287 if (!device->bdev) 288 dasd_info->open_count++; 289 290 /* 291 * check if device is really formatted 292 * LDL / CDL was returned by 'fill_info' 293 */ 294 if ((device->state < DASD_STATE_READY) || 295 (dasd_check_blocksize(device->bp_block))) 296 dasd_info->format = DASD_FORMAT_NONE; 297 298 dasd_info->features |= 299 ((device->features & DASD_FEATURE_READONLY) != 0); 300 301 if (device->discipline) 302 memcpy(dasd_info->type, device->discipline->name, 4); 303 else 304 memcpy(dasd_info->type, "none", 4); 305 306 if (device->request_queue->request_fn) { 307 struct list_head *l; 308 #ifdef DASD_EXTENDED_PROFILING 309 { 310 struct list_head *l; 311 spin_lock_irqsave(&device->lock, flags); 312 list_for_each(l, &device->request_queue->queue_head) 313 dasd_info->req_queue_len++; 314 spin_unlock_irqrestore(&device->lock, flags); 315 } 316 #endif /* DASD_EXTENDED_PROFILING */ 317 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 318 list_for_each(l, &device->ccw_queue) 319 dasd_info->chanq_len++; 320 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), 321 flags); 322 } 323 324 rc = 0; 325 if (copy_to_user(argp, dasd_info, 326 ((cmd == (unsigned int) BIODASDINFO2) ? 327 sizeof (struct dasd_information2_t) : 328 sizeof (struct dasd_information_t)))) 329 rc = -EFAULT; 330 kfree(dasd_info); 331 return rc; 332 } 333 334 /* 335 * Set read only 336 */ 337 static int 338 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 339 { 340 struct dasd_device *device = bdev->bd_disk->private_data; 341 int intval; 342 343 if (!capable(CAP_SYS_ADMIN)) 344 return -EACCES; 345 if (bdev != bdev->bd_contains) 346 // ro setting is not allowed for partitions 347 return -EINVAL; 348 if (get_user(intval, (int *)argp)) 349 return -EFAULT; 350 351 set_disk_ro(bdev->bd_disk, intval); 352 return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval); 353 } 354 355 static int 356 dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd, 357 unsigned long arg) 358 { 359 struct cmbdata __user *argp = (void __user *) arg; 360 size_t size = _IOC_SIZE(cmd); 361 struct cmbdata data; 362 int ret; 363 364 ret = cmf_readall(device->cdev, &data); 365 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 366 return -EFAULT; 367 return ret; 368 } 369 370 int 371 dasd_ioctl(struct inode *inode, struct file *file, 372 unsigned int cmd, unsigned long arg) 373 { 374 struct block_device *bdev = inode->i_bdev; 375 struct dasd_device *device = bdev->bd_disk->private_data; 376 void __user *argp = (void __user *)arg; 377 378 if (!device) 379 return -ENODEV; 380 381 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 382 PRINT_DEBUG("empty data ptr"); 383 return -EINVAL; 384 } 385 386 switch (cmd) { 387 case BIODASDDISABLE: 388 return dasd_ioctl_disable(bdev); 389 case BIODASDENABLE: 390 return dasd_ioctl_enable(bdev); 391 case BIODASDQUIESCE: 392 return dasd_ioctl_quiesce(device); 393 case BIODASDRESUME: 394 return dasd_ioctl_resume(device); 395 case BIODASDFMT: 396 return dasd_ioctl_format(bdev, argp); 397 case BIODASDINFO: 398 return dasd_ioctl_information(device, cmd, argp); 399 case BIODASDINFO2: 400 return dasd_ioctl_information(device, cmd, argp); 401 case BIODASDPRRD: 402 return dasd_ioctl_read_profile(device, argp); 403 case BIODASDPRRST: 404 return dasd_ioctl_reset_profile(device); 405 case BLKROSET: 406 return dasd_ioctl_set_ro(bdev, argp); 407 case DASDAPIVER: 408 return dasd_ioctl_api_version(argp); 409 case BIODASDCMFENABLE: 410 return enable_cmf(device->cdev); 411 case BIODASDCMFDISABLE: 412 return disable_cmf(device->cdev); 413 case BIODASDREADALLCMB: 414 return dasd_ioctl_readall_cmb(device, cmd, arg); 415 default: 416 /* if the discipline has an ioctl method try it. */ 417 if (device->discipline->ioctl) { 418 int rval = device->discipline->ioctl(device, cmd, argp); 419 if (rval != -ENOIOCTLCMD) 420 return rval; 421 } 422 423 return -EINVAL; 424 } 425 } 426 427 long 428 dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 429 { 430 int rval; 431 432 lock_kernel(); 433 rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg); 434 unlock_kernel(); 435 436 return (rval == -EINVAL) ? -ENOIOCTLCMD : rval; 437 } 438