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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
28#define PRINTK_HEADER "dasd_ioctl:"
29
30#include "dasd_int.h"
31
32
33static int
34dasd_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
42
43
44static int
45dasd_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
63
64
65static int
66dasd_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
78
79
80
81
82
83
84 dasd_set_target_state(base, DASD_STATE_BASIC);
85
86
87
88
89 set_capacity(bdev->bd_disk, 0);
90 dasd_put_device(base);
91 return 0;
92}
93
94
95
96
97static 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
117
118static 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
139
140static 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
175
176static 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
192
193
194
195
196static int
197dasd_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
218
219
220
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
234static 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
253
254static int
255dasd_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
291
292static 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
323out_err:
324 dasd_put_device(base);
325
326 return rc;
327}
328
329static 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
342
343static 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
376out_err:
377 dasd_put_device(base);
378
379 return rc;
380}
381
382#ifdef CONFIG_DASD_PROFILE
383
384
385
386static int dasd_ioctl_reset_profile(struct dasd_block *block)
387{
388 dasd_profile_reset(&block->profile);
389 return 0;
390}
391
392
393
394
395static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
396{
397 struct dasd_profile_info_t *data;
398 int rc = 0;
399
400 data = kmalloc(sizeof(*data), GFP_KERNEL);
401 if (!data)
402 return -ENOMEM;
403
404 spin_lock_bh(&block->profile.lock);
405 if (block->profile.data) {
406 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
407 data->dasd_io_sects = block->profile.data->dasd_io_sects;
408 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
409 sizeof(data->dasd_io_secs));
410 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
411 sizeof(data->dasd_io_times));
412 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
413 sizeof(data->dasd_io_timps));
414 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
415 sizeof(data->dasd_io_time1));
416 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
417 sizeof(data->dasd_io_time2));
418 memcpy(data->dasd_io_time2ps,
419 block->profile.data->dasd_io_time2ps,
420 sizeof(data->dasd_io_time2ps));
421 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
422 sizeof(data->dasd_io_time3));
423 memcpy(data->dasd_io_nr_req,
424 block->profile.data->dasd_io_nr_req,
425 sizeof(data->dasd_io_nr_req));
426 spin_unlock_bh(&block->profile.lock);
427 } else {
428 spin_unlock_bh(&block->profile.lock);
429 rc = -EIO;
430 goto out;
431 }
432 if (copy_to_user(argp, data, sizeof(*data)))
433 rc = -EFAULT;
434out:
435 kfree(data);
436 return rc;
437}
438#else
439static int dasd_ioctl_reset_profile(struct dasd_block *block)
440{
441 return -ENOTTY;
442}
443
444static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
445{
446 return -ENOTTY;
447}
448#endif
449
450
451
452
453static int __dasd_ioctl_information(struct dasd_block *block,
454 struct dasd_information2_t *dasd_info)
455{
456 struct subchannel_id sch_id;
457 struct ccw_dev_id dev_id;
458 struct dasd_device *base;
459 struct ccw_device *cdev;
460 struct list_head *l;
461 unsigned long flags;
462 int rc;
463
464 base = block->base;
465 if (!base->discipline || !base->discipline->fill_info)
466 return -EINVAL;
467
468 rc = base->discipline->fill_info(base, dasd_info);
469 if (rc)
470 return rc;
471
472 cdev = base->cdev;
473 ccw_device_get_id(cdev, &dev_id);
474 ccw_device_get_schid(cdev, &sch_id);
475
476 dasd_info->devno = dev_id.devno;
477 dasd_info->schid = sch_id.sch_no;
478 dasd_info->cu_type = cdev->id.cu_type;
479 dasd_info->cu_model = cdev->id.cu_model;
480 dasd_info->dev_type = cdev->id.dev_type;
481 dasd_info->dev_model = cdev->id.dev_model;
482 dasd_info->status = base->state;
483
484
485
486
487
488 dasd_info->open_count = atomic_read(&block->open_count);
489 if (!block->bdev)
490 dasd_info->open_count++;
491
492
493
494
495
496 if ((base->state < DASD_STATE_READY) ||
497 (dasd_check_blocksize(block->bp_block)))
498 dasd_info->format = DASD_FORMAT_NONE;
499
500 dasd_info->features |=
501 ((base->features & DASD_FEATURE_READONLY) != 0);
502
503 memcpy(dasd_info->type, base->discipline->name, 4);
504
505 spin_lock_irqsave(&block->queue_lock, flags);
506 list_for_each(l, &base->ccw_queue)
507 dasd_info->chanq_len++;
508 spin_unlock_irqrestore(&block->queue_lock, flags);
509 return 0;
510}
511
512static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
513 size_t copy_size)
514{
515 struct dasd_information2_t *dasd_info;
516 int error;
517
518 dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL);
519 if (!dasd_info)
520 return -ENOMEM;
521
522 error = __dasd_ioctl_information(block, dasd_info);
523 if (!error && copy_to_user(argp, dasd_info, copy_size))
524 error = -EFAULT;
525 kfree(dasd_info);
526 return error;
527}
528
529
530
531
532int dasd_set_read_only(struct block_device *bdev, bool ro)
533{
534 struct dasd_device *base;
535 int rc;
536
537
538 if (bdev_is_partition(bdev))
539 return 0;
540
541 base = dasd_device_from_gendisk(bdev->bd_disk);
542 if (!base)
543 return -ENODEV;
544 if (!ro && test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
545 rc = -EROFS;
546 else
547 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, ro);
548 dasd_put_device(base);
549 return rc;
550}
551
552static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
553 struct cmbdata __user *argp)
554{
555 size_t size = _IOC_SIZE(cmd);
556 struct cmbdata data;
557 int ret;
558
559 ret = cmf_readall(block->base->cdev, &data);
560 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
561 return -EFAULT;
562 return ret;
563}
564
565int dasd_ioctl(struct block_device *bdev, fmode_t mode,
566 unsigned int cmd, unsigned long arg)
567{
568 struct dasd_block *block;
569 struct dasd_device *base;
570 void __user *argp;
571 int rc;
572
573 if (is_compat_task())
574 argp = compat_ptr(arg);
575 else
576 argp = (void __user *)arg;
577
578 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg)
579 return -EINVAL;
580
581 base = dasd_device_from_gendisk(bdev->bd_disk);
582 if (!base)
583 return -ENODEV;
584 block = base->block;
585 rc = 0;
586 switch (cmd) {
587 case BIODASDDISABLE:
588 rc = dasd_ioctl_disable(bdev);
589 break;
590 case BIODASDENABLE:
591 rc = dasd_ioctl_enable(bdev);
592 break;
593 case BIODASDQUIESCE:
594 rc = dasd_ioctl_quiesce(block);
595 break;
596 case BIODASDRESUME:
597 rc = dasd_ioctl_resume(block);
598 break;
599 case BIODASDABORTIO:
600 rc = dasd_ioctl_abortio(block);
601 break;
602 case BIODASDALLOWIO:
603 rc = dasd_ioctl_allowio(block);
604 break;
605 case BIODASDFMT:
606 rc = dasd_ioctl_format(bdev, argp);
607 break;
608 case BIODASDCHECKFMT:
609 rc = dasd_ioctl_check_format(bdev, argp);
610 break;
611 case BIODASDINFO:
612 rc = dasd_ioctl_information(block, argp,
613 sizeof(struct dasd_information_t));
614 break;
615 case BIODASDINFO2:
616 rc = dasd_ioctl_information(block, argp,
617 sizeof(struct dasd_information2_t));
618 break;
619 case BIODASDPRRD:
620 rc = dasd_ioctl_read_profile(block, argp);
621 break;
622 case BIODASDPRRST:
623 rc = dasd_ioctl_reset_profile(block);
624 break;
625 case DASDAPIVER:
626 rc = dasd_ioctl_api_version(argp);
627 break;
628 case BIODASDCMFENABLE:
629 rc = enable_cmf(base->cdev);
630 break;
631 case BIODASDCMFDISABLE:
632 rc = disable_cmf(base->cdev);
633 break;
634 case BIODASDREADALLCMB:
635 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
636 break;
637 case BIODASDRAS:
638 rc = dasd_ioctl_release_space(bdev, argp);
639 break;
640 default:
641
642 rc = -ENOTTY;
643 if (base->discipline->ioctl)
644 rc = base->discipline->ioctl(block, cmd, argp);
645 }
646 dasd_put_device(base);
647 return rc;
648}
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info)
666{
667 struct dasd_device *base;
668 int error;
669
670 if (disk->fops != &dasd_device_operations)
671 return -EINVAL;
672
673 base = dasd_device_from_gendisk(disk);
674 if (!base)
675 return -ENODEV;
676 error = __dasd_ioctl_information(base->block, info);
677 dasd_put_device(base);
678 return error;
679}
680
681EXPORT_SYMBOL_GPL(dasd_biodasdinfo);
682
