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 27static int 28dasd_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 */ 38static int 39dasd_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 */ 58static int 59dasd_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 */ 88static int 89dasd_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 */ 108static int 109dasd_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 */ 133static int 134dasd_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 */ 186static int 187dasd_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 */ 213static int 214dasd_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 */ 223static int 224dasd_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 234static int 235dasd_ioctl_reset_profile(struct dasd_device *device) 236{ 237 return -ENOSYS; 238} 239 240static int 241dasd_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 */ 250static int 251dasd_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 struct ccw_dev_id dev_id; 259 260 if (!device->discipline->fill_info) 261 return -EINVAL; 262 263 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); 264 if (dasd_info == NULL) 265 return -ENOMEM; 266 267 rc = device->discipline->fill_info(device, dasd_info); 268 if (rc) { 269 kfree(dasd_info); 270 return rc; 271 } 272 273 cdev = device->cdev; 274 ccw_device_get_id(cdev, &dev_id); 275 276 dasd_info->devno = dev_id.devno; 277 dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev); 278 dasd_info->cu_type = cdev->id.cu_type; 279 dasd_info->cu_model = cdev->id.cu_model; 280 dasd_info->dev_type = cdev->id.dev_type; 281 dasd_info->dev_model = cdev->id.dev_model; 282 dasd_info->status = device->state; 283 /* 284 * The open_count is increased for every opener, that includes 285 * the blkdev_get in dasd_scan_partitions. 286 * This must be hidden from user-space. 287 */ 288 dasd_info->open_count = atomic_read(&device->open_count); 289 if (!device->bdev) 290 dasd_info->open_count++; 291 292 /* 293 * check if device is really formatted 294 * LDL / CDL was returned by 'fill_info' 295 */ 296 if ((device->state < DASD_STATE_READY) || 297 (dasd_check_blocksize(device->bp_block))) 298 dasd_info->format = DASD_FORMAT_NONE; 299 300 dasd_info->features |= 301 ((device->features & DASD_FEATURE_READONLY) != 0); 302 303 if (device->discipline) 304 memcpy(dasd_info->type, device->discipline->name, 4); 305 else 306 memcpy(dasd_info->type, "none", 4); 307 308 if (device->request_queue->request_fn) { 309 struct list_head *l; 310#ifdef DASD_EXTENDED_PROFILING 311 { 312 struct list_head *l; 313 spin_lock_irqsave(&device->lock, flags); 314 list_for_each(l, &device->request_queue->queue_head) 315 dasd_info->req_queue_len++; 316 spin_unlock_irqrestore(&device->lock, flags); 317 } 318#endif /* DASD_EXTENDED_PROFILING */ 319 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 320 list_for_each(l, &device->ccw_queue) 321 dasd_info->chanq_len++; 322 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), 323 flags); 324 } 325 326 rc = 0; 327 if (copy_to_user(argp, dasd_info, 328 ((cmd == (unsigned int) BIODASDINFO2) ? 329 sizeof (struct dasd_information2_t) : 330 sizeof (struct dasd_information_t)))) 331 rc = -EFAULT; 332 kfree(dasd_info); 333 return rc; 334} 335 336/* 337 * Set read only 338 */ 339static int 340dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) 341{ 342 struct dasd_device *device = bdev->bd_disk->private_data; 343 int intval; 344 345 if (!capable(CAP_SYS_ADMIN)) 346 return -EACCES; 347 if (bdev != bdev->bd_contains) 348 // ro setting is not allowed for partitions 349 return -EINVAL; 350 if (get_user(intval, (int __user *)argp)) 351 return -EFAULT; 352 353 set_disk_ro(bdev->bd_disk, intval); 354 return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval); 355} 356 357static int 358dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd, 359 unsigned long arg) 360{ 361 struct cmbdata __user *argp = (void __user *) arg; 362 size_t size = _IOC_SIZE(cmd); 363 struct cmbdata data; 364 int ret; 365 366 ret = cmf_readall(device->cdev, &data); 367 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) 368 return -EFAULT; 369 return ret; 370} 371 372int 373dasd_ioctl(struct inode *inode, struct file *file, 374 unsigned int cmd, unsigned long arg) 375{ 376 struct block_device *bdev = inode->i_bdev; 377 struct dasd_device *device = bdev->bd_disk->private_data; 378 void __user *argp = (void __user *)arg; 379 380 if (!device) 381 return -ENODEV; 382 383 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { 384 PRINT_DEBUG("empty data ptr"); 385 return -EINVAL; 386 } 387 388 switch (cmd) { 389 case BIODASDDISABLE: 390 return dasd_ioctl_disable(bdev); 391 case BIODASDENABLE: 392 return dasd_ioctl_enable(bdev); 393 case BIODASDQUIESCE: 394 return dasd_ioctl_quiesce(device); 395 case BIODASDRESUME: 396 return dasd_ioctl_resume(device); 397 case BIODASDFMT: 398 return dasd_ioctl_format(bdev, argp); 399 case BIODASDINFO: 400 return dasd_ioctl_information(device, cmd, argp); 401 case BIODASDINFO2: 402 return dasd_ioctl_information(device, cmd, argp); 403 case BIODASDPRRD: 404 return dasd_ioctl_read_profile(device, argp); 405 case BIODASDPRRST: 406 return dasd_ioctl_reset_profile(device); 407 case BLKROSET: 408 return dasd_ioctl_set_ro(bdev, argp); 409 case DASDAPIVER: 410 return dasd_ioctl_api_version(argp); 411 case BIODASDCMFENABLE: 412 return enable_cmf(device->cdev); 413 case BIODASDCMFDISABLE: 414 return disable_cmf(device->cdev); 415 case BIODASDREADALLCMB: 416 return dasd_ioctl_readall_cmb(device, cmd, arg); 417 default: 418 /* if the discipline has an ioctl method try it. */ 419 if (device->discipline->ioctl) { 420 int rval = device->discipline->ioctl(device, cmd, argp); 421 if (rval != -ENOIOCTLCMD) 422 return rval; 423 } 424 425 return -EINVAL; 426 } 427} 428 429long 430dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 431{ 432 int rval; 433 434 lock_kernel(); 435 rval = dasd_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg); 436 unlock_kernel(); 437 438 return (rval == -EINVAL) ? -ENOIOCTLCMD : rval; 439} 440