1 // SPDX-License-Identifier: GPL-2.0
2 /*
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 * Copyright IBM Corp. 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/compat.h>
17 #include <linux/major.h>
18 #include <linux/fs.h>
19 #include <linux/blkpg.h>
20 #include <linux/slab.h>
21 #include <asm/ccwdev.h>
22 #include <asm/schid.h>
23 #include <asm/cmb.h>
24 #include <linux/uaccess.h>
25 #include <linux/dasd_mod.h>
26
27 /* This is ugly... */
28 #define PRINTK_HEADER "dasd_ioctl:"
29
30 #include "dasd_int.h"
31
32
33 static int
dasd_ioctl_api_version(void __user * argp)34 dasd_ioctl_api_version(void __user *argp)
35 {
36 int ver = DASD_API_VERSION;
37 return put_user(ver, (int __user *)argp);
38 }
39
40 /*
41 * Enable device.
42 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
43 */
44 static int
dasd_ioctl_enable(struct block_device * bdev)45 dasd_ioctl_enable(struct block_device *bdev)
46 {
47 struct dasd_device *base;
48
49 if (!capable(CAP_SYS_ADMIN))
50 return -EACCES;
51
52 base = dasd_device_from_gendisk(bdev->bd_disk);
53 if (!base)
54 return -ENODEV;
55
56 dasd_enable_device(base);
57 dasd_put_device(base);
58 return 0;
59 }
60
61 /*
62 * Disable device.
63 * Used by dasdfmt. Disable I/O operations but allow ioctls.
64 */
65 static int
dasd_ioctl_disable(struct block_device * bdev)66 dasd_ioctl_disable(struct block_device *bdev)
67 {
68 struct dasd_device *base;
69
70 if (!capable(CAP_SYS_ADMIN))
71 return -EACCES;
72
73 base = dasd_device_from_gendisk(bdev->bd_disk);
74 if (!base)
75 return -ENODEV;
76 /*
77 * Man this is sick. We don't do a real disable but only downgrade
78 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
79 * BIODASDDISABLE to disable accesses to the device via the block
80 * device layer but it still wants to do i/o on the device by
81 * using the BIODASDFMT ioctl. Therefore the correct state for the
82 * device is DASD_STATE_BASIC that allows to do basic i/o.
83 */
84 dasd_set_target_state(base, DASD_STATE_BASIC);
85 /*
86 * Set i_size to zero, since read, write, etc. check against this
87 * value.
88 */
89 set_capacity(bdev->bd_disk, 0);
90 dasd_put_device(base);
91 return 0;
92 }
93
94 /*
95 * Quiesce device.
96 */
dasd_ioctl_quiesce(struct dasd_block * block)97 static int dasd_ioctl_quiesce(struct dasd_block *block)
98 {
99 unsigned long flags;
100 struct dasd_device *base;
101
102 base = block->base;
103 if (!capable (CAP_SYS_ADMIN))
104 return -EACCES;
105
106 pr_info("%s: The DASD has been put in the quiesce "
107 "state\n", dev_name(&base->cdev->dev));
108 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
109 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
110 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
111 return 0;
112 }
113
114
115 /*
116 * Resume device.
117 */
dasd_ioctl_resume(struct dasd_block * block)118 static int dasd_ioctl_resume(struct dasd_block *block)
119 {
120 unsigned long flags;
121 struct dasd_device *base;
122
123 base = block->base;
124 if (!capable (CAP_SYS_ADMIN))
125 return -EACCES;
126
127 pr_info("%s: I/O operations have been resumed "
128 "on the DASD\n", dev_name(&base->cdev->dev));
129 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
130 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
131 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
132
133 dasd_schedule_block_bh(block);
134 return 0;
135 }
136
137 /*
138 * Abort all failfast I/O on a device.
139 */
dasd_ioctl_abortio(struct dasd_block * block)140 static int dasd_ioctl_abortio(struct dasd_block *block)
141 {
142 unsigned long flags;
143 struct dasd_device *base;
144 struct dasd_ccw_req *cqr, *n;
145
146 base = block->base;
147 if (!capable(CAP_SYS_ADMIN))
148 return -EACCES;
149
150 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
151 return 0;
152 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
153
154 spin_lock_irqsave(&block->request_queue_lock, flags);
155 spin_lock(&block->queue_lock);
156 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
157 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
158 cqr->callback_data &&
159 cqr->callback_data != DASD_SLEEPON_START_TAG &&
160 cqr->callback_data != DASD_SLEEPON_END_TAG) {
161 spin_unlock(&block->queue_lock);
162 blk_abort_request(cqr->callback_data);
163 spin_lock(&block->queue_lock);
164 }
165 }
166 spin_unlock(&block->queue_lock);
167 spin_unlock_irqrestore(&block->request_queue_lock, flags);
168
169 dasd_schedule_block_bh(block);
170 return 0;
171 }
172
173 /*
174 * Allow I/O on a device
175 */
dasd_ioctl_allowio(struct dasd_block * block)176 static int dasd_ioctl_allowio(struct dasd_block *block)
177 {
178 struct dasd_device *base;
179
180 base = block->base;
181 if (!capable(CAP_SYS_ADMIN))
182 return -EACCES;
183
184 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
185 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
186
187 return 0;
188 }
189
190 /*
191 * performs formatting of _device_ according to _fdata_
192 * Note: The discipline's format_function is assumed to deliver formatting
193 * commands to format multiple units of the device. In terms of the ECKD
194 * devices this means CCWs are generated to format multiple tracks.
195 */
196 static int
dasd_format(struct dasd_block * block,struct format_data_t * fdata)197 dasd_format(struct dasd_block *block, struct format_data_t *fdata)
198 {
199 struct dasd_device *base;
200 int rc;
201
202 base = block->base;
203 if (base->discipline->format_device == NULL)
204 return -EPERM;
205
206 if (base->state != DASD_STATE_BASIC) {
207 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
208 dev_name(&base->cdev->dev));
209 return -EBUSY;
210 }
211
212 DBF_DEV_EVENT(DBF_NOTICE, base,
213 "formatting units %u to %u (%u B blocks) flags %u",
214 fdata->start_unit,
215 fdata->stop_unit, fdata->blksize, fdata->intensity);
216
217 /* Since dasdfmt keeps the device open after it was disabled,
218 * there still exists an inode for this device.
219 * We must update i_blkbits, otherwise we might get errors when
220 * enabling the device later.
221 */
222 if (fdata->start_unit == 0) {
223 block->gdp->part0->bd_inode->i_blkbits =
224 blksize_bits(fdata->blksize);
225 }
226
227 rc = base->discipline->format_device(base, fdata, 1);
228 if (rc == -EAGAIN)
229 rc = base->discipline->format_device(base, fdata, 0);
230
231 return rc;
232 }
233
dasd_check_format(struct dasd_block * block,struct format_check_t * cdata)234 static int dasd_check_format(struct dasd_block *block,
235 struct format_check_t *cdata)
236 {
237 struct dasd_device *base;
238 int rc;
239
240 base = block->base;
241 if (!base->discipline->check_device_format)
242 return -ENOTTY;
243
244 rc = base->discipline->check_device_format(base, cdata, 1);
245 if (rc == -EAGAIN)
246 rc = base->discipline->check_device_format(base, cdata, 0);
247
248 return rc;
249 }
250
251 /*
252 * Format device.
253 */
254 static int
dasd_ioctl_format(struct block_device * bdev,void __user * argp)255 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
256 {
257 struct dasd_device *base;
258 struct format_data_t fdata;
259 int rc;
260
261 if (!capable(CAP_SYS_ADMIN))
262 return -EACCES;
263 if (!argp)
264 return -EINVAL;
265 base = dasd_device_from_gendisk(bdev->bd_disk);
266 if (!base)
267 return -ENODEV;
268 if (base->features & DASD_FEATURE_READONLY ||
269 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
270 dasd_put_device(base);
271 return -EROFS;
272 }
273 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
274 dasd_put_device(base);
275 return -EFAULT;
276 }
277 if (bdev_is_partition(bdev)) {
278 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
279 dev_name(&base->cdev->dev));
280 dasd_put_device(base);
281 return -EINVAL;
282 }
283 rc = dasd_format(base->block, &fdata);
284 dasd_put_device(base);
285
286 return rc;
287 }
288
289 /*
290 * Check device format
291 */
dasd_ioctl_check_format(struct block_device * bdev,void __user * argp)292 static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
293 {
294 struct format_check_t cdata;
295 struct dasd_device *base;
296 int rc = 0;
297
298 if (!argp)
299 return -EINVAL;
300
301 base = dasd_device_from_gendisk(bdev->bd_disk);
302 if (!base)
303 return -ENODEV;
304 if (bdev_is_partition(bdev)) {
305 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
306 dev_name(&base->cdev->dev));
307 rc = -EINVAL;
308 goto out_err;
309 }
310
311 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
312 rc = -EFAULT;
313 goto out_err;
314 }
315
316 rc = dasd_check_format(base->block, &cdata);
317 if (rc)
318 goto out_err;
319
320 if (copy_to_user(argp, &cdata, sizeof(cdata)))
321 rc = -EFAULT;
322
323 out_err:
324 dasd_put_device(base);
325
326 return rc;
327 }
328
dasd_release_space(struct dasd_device * device,struct format_data_t * rdata)329 static int dasd_release_space(struct dasd_device *device,
330 struct format_data_t *rdata)
331 {
332 if (!device->discipline->is_ese && !device->discipline->is_ese(device))
333 return -ENOTSUPP;
334 if (!device->discipline->release_space)
335 return -ENOTSUPP;
336
337 return device->discipline->release_space(device, rdata);
338 }
339
340 /*
341 * Release allocated space
342 */
dasd_ioctl_release_space(struct block_device * bdev,void __user * argp)343 static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
344 {
345 struct format_data_t rdata;
346 struct dasd_device *base;
347 int rc = 0;
348
349 if (!capable(CAP_SYS_ADMIN))
350 return -EACCES;
351 if (!argp)
352 return -EINVAL;
353
354 base = dasd_device_from_gendisk(bdev->bd_disk);
355 if (!base)
356 return -ENODEV;
357 if (base->features & DASD_FEATURE_READONLY ||
358 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
359 rc = -EROFS;
360 goto out_err;
361 }
362 if (bdev_is_partition(bdev)) {
363 pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
364 dev_name(&base->cdev->dev));
365 rc = -EINVAL;
366 goto out_err;
367 }
368
369 if (copy_from_user(&rdata, argp, sizeof(rdata))) {
370 rc = -EFAULT;
371 goto out_err;
372 }
373
374 rc = dasd_release_space(base, &rdata);
375
376 out_err:
377 dasd_put_device(base);
378
379 return rc;
380 }
381
382 /*
383 * Swap driver iternal copy relation.
384 */
385 static int
dasd_ioctl_copy_pair_swap(struct block_device * bdev,void __user * argp)386 dasd_ioctl_copy_pair_swap(struct block_device *bdev, void __user *argp)
387 {
388 struct dasd_copypair_swap_data_t data;
389 struct dasd_device *device;
390 int rc;
391
392 if (!capable(CAP_SYS_ADMIN))
393 return -EACCES;
394
395 device = dasd_device_from_gendisk(bdev->bd_disk);
396 if (!device)
397 return -ENODEV;
398
399 if (copy_from_user(&data, argp, sizeof(struct dasd_copypair_swap_data_t))) {
400 dasd_put_device(device);
401 return -EFAULT;
402 }
403 if (memchr_inv(data.reserved, 0, sizeof(data.reserved))) {
404 pr_warn("%s: Invalid swap data specified\n",
405 dev_name(&device->cdev->dev));
406 dasd_put_device(device);
407 return DASD_COPYPAIRSWAP_INVALID;
408 }
409 if (bdev_is_partition(bdev)) {
410 pr_warn("%s: The specified DASD is a partition and cannot be swapped\n",
411 dev_name(&device->cdev->dev));
412 dasd_put_device(device);
413 return DASD_COPYPAIRSWAP_INVALID;
414 }
415 if (!device->copy) {
416 pr_warn("%s: The specified DASD has no copy pair set up\n",
417 dev_name(&device->cdev->dev));
418 dasd_put_device(device);
419 return -ENODEV;
420 }
421 if (!device->discipline->copy_pair_swap) {
422 dasd_put_device(device);
423 return -EOPNOTSUPP;
424 }
425 rc = device->discipline->copy_pair_swap(device, data.primary,
426 data.secondary);
427 dasd_put_device(device);
428
429 return rc;
430 }
431
432 #ifdef CONFIG_DASD_PROFILE
433 /*
434 * Reset device profile information
435 */
dasd_ioctl_reset_profile(struct dasd_block * block)436 static int dasd_ioctl_reset_profile(struct dasd_block *block)
437 {
438 dasd_profile_reset(&block->profile);
439 return 0;
440 }
441
442 /*
443 * Return device profile information
444 */
dasd_ioctl_read_profile(struct dasd_block * block,void __user * argp)445 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
446 {
447 struct dasd_profile_info_t *data;
448 int rc = 0;
449
450 data = kmalloc(sizeof(*data), GFP_KERNEL);
451 if (!data)
452 return -ENOMEM;
453
454 spin_lock_bh(&block->profile.lock);
455 if (block->profile.data) {
456 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
457 data->dasd_io_sects = block->profile.data->dasd_io_sects;
458 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
459 sizeof(data->dasd_io_secs));
460 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
461 sizeof(data->dasd_io_times));
462 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
463 sizeof(data->dasd_io_timps));
464 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
465 sizeof(data->dasd_io_time1));
466 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
467 sizeof(data->dasd_io_time2));
468 memcpy(data->dasd_io_time2ps,
469 block->profile.data->dasd_io_time2ps,
470 sizeof(data->dasd_io_time2ps));
471 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
472 sizeof(data->dasd_io_time3));
473 memcpy(data->dasd_io_nr_req,
474 block->profile.data->dasd_io_nr_req,
475 sizeof(data->dasd_io_nr_req));
476 spin_unlock_bh(&block->profile.lock);
477 } else {
478 spin_unlock_bh(&block->profile.lock);
479 rc = -EIO;
480 goto out;
481 }
482 if (copy_to_user(argp, data, sizeof(*data)))
483 rc = -EFAULT;
484 out:
485 kfree(data);
486 return rc;
487 }
488 #else
dasd_ioctl_reset_profile(struct dasd_block * block)489 static int dasd_ioctl_reset_profile(struct dasd_block *block)
490 {
491 return -ENOTTY;
492 }
493
dasd_ioctl_read_profile(struct dasd_block * block,void __user * argp)494 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
495 {
496 return -ENOTTY;
497 }
498 #endif
499
500 /*
501 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
502 */
__dasd_ioctl_information(struct dasd_block * block,struct dasd_information2_t * dasd_info)503 static int __dasd_ioctl_information(struct dasd_block *block,
504 struct dasd_information2_t *dasd_info)
505 {
506 struct subchannel_id sch_id;
507 struct ccw_dev_id dev_id;
508 struct dasd_device *base;
509 struct ccw_device *cdev;
510 struct list_head *l;
511 unsigned long flags;
512 int rc;
513
514 base = block->base;
515 if (!base->discipline || !base->discipline->fill_info)
516 return -EINVAL;
517
518 rc = base->discipline->fill_info(base, dasd_info);
519 if (rc)
520 return rc;
521
522 cdev = base->cdev;
523 ccw_device_get_id(cdev, &dev_id);
524 ccw_device_get_schid(cdev, &sch_id);
525
526 dasd_info->devno = dev_id.devno;
527 dasd_info->schid = sch_id.sch_no;
528 dasd_info->cu_type = cdev->id.cu_type;
529 dasd_info->cu_model = cdev->id.cu_model;
530 dasd_info->dev_type = cdev->id.dev_type;
531 dasd_info->dev_model = cdev->id.dev_model;
532 dasd_info->status = base->state;
533 /*
534 * The open_count is increased for every opener, that includes
535 * the blkdev_get in dasd_scan_partitions.
536 * This must be hidden from user-space.
537 */
538 dasd_info->open_count = atomic_read(&block->open_count);
539 if (!block->bdev)
540 dasd_info->open_count++;
541
542 /*
543 * check if device is really formatted
544 * LDL / CDL was returned by 'fill_info'
545 */
546 if ((base->state < DASD_STATE_READY) ||
547 (dasd_check_blocksize(block->bp_block)))
548 dasd_info->format = DASD_FORMAT_NONE;
549
550 dasd_info->features |=
551 ((base->features & DASD_FEATURE_READONLY) != 0);
552
553 memcpy(dasd_info->type, base->discipline->name, 4);
554
555 spin_lock_irqsave(&block->queue_lock, flags);
556 list_for_each(l, &base->ccw_queue)
557 dasd_info->chanq_len++;
558 spin_unlock_irqrestore(&block->queue_lock, flags);
559 return 0;
560 }
561
dasd_ioctl_information(struct dasd_block * block,void __user * argp,size_t copy_size)562 static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
563 size_t copy_size)
564 {
565 struct dasd_information2_t *dasd_info;
566 int error;
567
568 dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL);
569 if (!dasd_info)
570 return -ENOMEM;
571
572 error = __dasd_ioctl_information(block, dasd_info);
573 if (!error && copy_to_user(argp, dasd_info, copy_size))
574 error = -EFAULT;
575 kfree(dasd_info);
576 return error;
577 }
578
579 /*
580 * Set read only
581 */
dasd_set_read_only(struct block_device * bdev,bool ro)582 int dasd_set_read_only(struct block_device *bdev, bool ro)
583 {
584 struct dasd_device *base;
585 int rc;
586
587 /* do not manipulate hardware state for partitions */
588 if (bdev_is_partition(bdev))
589 return 0;
590
591 base = dasd_device_from_gendisk(bdev->bd_disk);
592 if (!base)
593 return -ENODEV;
594 if (!ro && test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
595 rc = -EROFS;
596 else
597 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, ro);
598 dasd_put_device(base);
599 return rc;
600 }
601
dasd_ioctl_readall_cmb(struct dasd_block * block,unsigned int cmd,struct cmbdata __user * argp)602 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
603 struct cmbdata __user *argp)
604 {
605 size_t size = _IOC_SIZE(cmd);
606 struct cmbdata data;
607 int ret;
608
609 ret = cmf_readall(block->base->cdev, &data);
610 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
611 return -EFAULT;
612 return ret;
613 }
614
dasd_ioctl(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)615 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
616 unsigned int cmd, unsigned long arg)
617 {
618 struct dasd_block *block;
619 struct dasd_device *base;
620 void __user *argp;
621 int rc;
622
623 if (is_compat_task())
624 argp = compat_ptr(arg);
625 else
626 argp = (void __user *)arg;
627
628 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg)
629 return -EINVAL;
630
631 base = dasd_device_from_gendisk(bdev->bd_disk);
632 if (!base)
633 return -ENODEV;
634 block = base->block;
635 rc = 0;
636 switch (cmd) {
637 case BIODASDDISABLE:
638 rc = dasd_ioctl_disable(bdev);
639 break;
640 case BIODASDENABLE:
641 rc = dasd_ioctl_enable(bdev);
642 break;
643 case BIODASDQUIESCE:
644 rc = dasd_ioctl_quiesce(block);
645 break;
646 case BIODASDRESUME:
647 rc = dasd_ioctl_resume(block);
648 break;
649 case BIODASDABORTIO:
650 rc = dasd_ioctl_abortio(block);
651 break;
652 case BIODASDALLOWIO:
653 rc = dasd_ioctl_allowio(block);
654 break;
655 case BIODASDFMT:
656 rc = dasd_ioctl_format(bdev, argp);
657 break;
658 case BIODASDCHECKFMT:
659 rc = dasd_ioctl_check_format(bdev, argp);
660 break;
661 case BIODASDINFO:
662 rc = dasd_ioctl_information(block, argp,
663 sizeof(struct dasd_information_t));
664 break;
665 case BIODASDINFO2:
666 rc = dasd_ioctl_information(block, argp,
667 sizeof(struct dasd_information2_t));
668 break;
669 case BIODASDPRRD:
670 rc = dasd_ioctl_read_profile(block, argp);
671 break;
672 case BIODASDPRRST:
673 rc = dasd_ioctl_reset_profile(block);
674 break;
675 case DASDAPIVER:
676 rc = dasd_ioctl_api_version(argp);
677 break;
678 case BIODASDCMFENABLE:
679 rc = enable_cmf(base->cdev);
680 break;
681 case BIODASDCMFDISABLE:
682 rc = disable_cmf(base->cdev);
683 break;
684 case BIODASDREADALLCMB:
685 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
686 break;
687 case BIODASDRAS:
688 rc = dasd_ioctl_release_space(bdev, argp);
689 break;
690 case BIODASDCOPYPAIRSWAP:
691 rc = dasd_ioctl_copy_pair_swap(bdev, argp);
692 break;
693 default:
694 /* if the discipline has an ioctl method try it. */
695 rc = -ENOTTY;
696 if (base->discipline->ioctl)
697 rc = base->discipline->ioctl(block, cmd, argp);
698 }
699 dasd_put_device(base);
700 return rc;
701 }
702
703
704 /**
705 * dasd_biodasdinfo() - fill out the dasd information structure
706 * @disk: [in] pointer to gendisk structure that references a DASD
707 * @info: [out] pointer to the dasd_information2_t structure
708 *
709 * Provide access to DASD specific information.
710 * The gendisk structure is checked if it belongs to the DASD driver by
711 * comparing the gendisk->fops pointer.
712 * If it does not belong to the DASD driver -EINVAL is returned.
713 * Otherwise the provided dasd_information2_t structure is filled out.
714 *
715 * Returns:
716 * %0 on success and a negative error value on failure.
717 */
dasd_biodasdinfo(struct gendisk * disk,struct dasd_information2_t * info)718 int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info)
719 {
720 struct dasd_device *base;
721 int error;
722
723 if (disk->fops != &dasd_device_operations)
724 return -EINVAL;
725
726 base = dasd_device_from_gendisk(disk);
727 if (!base)
728 return -ENODEV;
729 error = __dasd_ioctl_information(base->block, info);
730 dasd_put_device(base);
731 return error;
732 }
733 /* export that symbol_get in partition detection is possible */
734 EXPORT_SYMBOL_GPL(dasd_biodasdinfo);
735