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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/compat.h>
22#include <asm/ccwdev.h>
23#include <asm/schid.h>
24#include <asm/cmb.h>
25#include <linux/uaccess.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
58 mutex_lock(&bdev->bd_mutex);
59 i_size_write(bdev->bd_inode,
60 (loff_t)get_capacity(base->block->gdp) << 9);
61 mutex_unlock(&bdev->bd_mutex);
62 dasd_put_device(base);
63 return 0;
64}
65
66
67
68
69
70static int
71dasd_ioctl_disable(struct block_device *bdev)
72{
73 struct dasd_device *base;
74
75 if (!capable(CAP_SYS_ADMIN))
76 return -EACCES;
77
78 base = dasd_device_from_gendisk(bdev->bd_disk);
79 if (!base)
80 return -ENODEV;
81
82
83
84
85
86
87
88
89 dasd_set_target_state(base, DASD_STATE_BASIC);
90
91
92
93
94 mutex_lock(&bdev->bd_mutex);
95 i_size_write(bdev->bd_inode, 0);
96 mutex_unlock(&bdev->bd_mutex);
97 dasd_put_device(base);
98 return 0;
99}
100
101
102
103
104static int dasd_ioctl_quiesce(struct dasd_block *block)
105{
106 unsigned long flags;
107 struct dasd_device *base;
108
109 base = block->base;
110 if (!capable (CAP_SYS_ADMIN))
111 return -EACCES;
112
113 pr_info("%s: The DASD has been put in the quiesce "
114 "state\n", dev_name(&base->cdev->dev));
115 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
116 dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
117 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
118 return 0;
119}
120
121
122
123
124
125static int dasd_ioctl_resume(struct dasd_block *block)
126{
127 unsigned long flags;
128 struct dasd_device *base;
129
130 base = block->base;
131 if (!capable (CAP_SYS_ADMIN))
132 return -EACCES;
133
134 pr_info("%s: I/O operations have been resumed "
135 "on the DASD\n", dev_name(&base->cdev->dev));
136 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
137 dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
138 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
139
140 dasd_schedule_block_bh(block);
141 return 0;
142}
143
144
145
146
147static int dasd_ioctl_abortio(struct dasd_block *block)
148{
149 unsigned long flags;
150 struct dasd_device *base;
151 struct dasd_ccw_req *cqr, *n;
152
153 base = block->base;
154 if (!capable(CAP_SYS_ADMIN))
155 return -EACCES;
156
157 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
158 return 0;
159 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
160
161 spin_lock_irqsave(&block->request_queue_lock, flags);
162 spin_lock(&block->queue_lock);
163 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
164 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
165 cqr->callback_data &&
166 cqr->callback_data != DASD_SLEEPON_START_TAG &&
167 cqr->callback_data != DASD_SLEEPON_END_TAG) {
168 spin_unlock(&block->queue_lock);
169 blk_abort_request(cqr->callback_data);
170 spin_lock(&block->queue_lock);
171 }
172 }
173 spin_unlock(&block->queue_lock);
174 spin_unlock_irqrestore(&block->request_queue_lock, flags);
175
176 dasd_schedule_block_bh(block);
177 return 0;
178}
179
180
181
182
183static int dasd_ioctl_allowio(struct dasd_block *block)
184{
185 struct dasd_device *base;
186
187 base = block->base;
188 if (!capable(CAP_SYS_ADMIN))
189 return -EACCES;
190
191 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
192 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
193
194 return 0;
195}
196
197
198
199
200
201
202
203static int
204dasd_format(struct dasd_block *block, struct format_data_t *fdata)
205{
206 struct dasd_device *base;
207 int rc;
208
209 base = block->base;
210 if (base->discipline->format_device == NULL)
211 return -EPERM;
212
213 if (base->state != DASD_STATE_BASIC) {
214 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
215 dev_name(&base->cdev->dev));
216 return -EBUSY;
217 }
218
219 DBF_DEV_EVENT(DBF_NOTICE, base,
220 "formatting units %u to %u (%u B blocks) flags %u",
221 fdata->start_unit,
222 fdata->stop_unit, fdata->blksize, fdata->intensity);
223
224
225
226
227
228
229 if (fdata->start_unit == 0) {
230 struct block_device *bdev = bdget_disk(block->gdp, 0);
231 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
232 bdput(bdev);
233 }
234
235 rc = base->discipline->format_device(base, fdata, 1);
236 if (rc == -EAGAIN)
237 rc = base->discipline->format_device(base, fdata, 0);
238
239 return rc;
240}
241
242static int dasd_check_format(struct dasd_block *block,
243 struct format_check_t *cdata)
244{
245 struct dasd_device *base;
246 int rc;
247
248 base = block->base;
249 if (!base->discipline->check_device_format)
250 return -ENOTTY;
251
252 rc = base->discipline->check_device_format(base, cdata, 1);
253 if (rc == -EAGAIN)
254 rc = base->discipline->check_device_format(base, cdata, 0);
255
256 return rc;
257}
258
259
260
261
262static int
263dasd_ioctl_format(struct block_device *bdev, void __user *argp)
264{
265 struct dasd_device *base;
266 struct format_data_t fdata;
267 int rc;
268
269 if (!capable(CAP_SYS_ADMIN))
270 return -EACCES;
271 if (!argp)
272 return -EINVAL;
273 base = dasd_device_from_gendisk(bdev->bd_disk);
274 if (!base)
275 return -ENODEV;
276 if (base->features & DASD_FEATURE_READONLY ||
277 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
278 dasd_put_device(base);
279 return -EROFS;
280 }
281 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
282 dasd_put_device(base);
283 return -EFAULT;
284 }
285 if (bdev != bdev->bd_contains) {
286 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
287 dev_name(&base->cdev->dev));
288 dasd_put_device(base);
289 return -EINVAL;
290 }
291 rc = dasd_format(base->block, &fdata);
292 dasd_put_device(base);
293
294 return rc;
295}
296
297
298
299
300static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
301{
302 struct format_check_t cdata;
303 struct dasd_device *base;
304 int rc = 0;
305
306 if (!argp)
307 return -EINVAL;
308
309 base = dasd_device_from_gendisk(bdev->bd_disk);
310 if (!base)
311 return -ENODEV;
312 if (bdev != bdev->bd_contains) {
313 pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
314 dev_name(&base->cdev->dev));
315 rc = -EINVAL;
316 goto out_err;
317 }
318
319 if (copy_from_user(&cdata, argp, sizeof(cdata))) {
320 rc = -EFAULT;
321 goto out_err;
322 }
323
324 rc = dasd_check_format(base->block, &cdata);
325 if (rc)
326 goto out_err;
327
328 if (copy_to_user(argp, &cdata, sizeof(cdata)))
329 rc = -EFAULT;
330
331out_err:
332 dasd_put_device(base);
333
334 return rc;
335}
336
337#ifdef CONFIG_DASD_PROFILE
338
339
340
341static int dasd_ioctl_reset_profile(struct dasd_block *block)
342{
343 dasd_profile_reset(&block->profile);
344 return 0;
345}
346
347
348
349
350static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
351{
352 struct dasd_profile_info_t *data;
353 int rc = 0;
354
355 data = kmalloc(sizeof(*data), GFP_KERNEL);
356 if (!data)
357 return -ENOMEM;
358
359 spin_lock_bh(&block->profile.lock);
360 if (block->profile.data) {
361 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
362 data->dasd_io_sects = block->profile.data->dasd_io_sects;
363 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
364 sizeof(data->dasd_io_secs));
365 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
366 sizeof(data->dasd_io_times));
367 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
368 sizeof(data->dasd_io_timps));
369 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
370 sizeof(data->dasd_io_time1));
371 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
372 sizeof(data->dasd_io_time2));
373 memcpy(data->dasd_io_time2ps,
374 block->profile.data->dasd_io_time2ps,
375 sizeof(data->dasd_io_time2ps));
376 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
377 sizeof(data->dasd_io_time3));
378 memcpy(data->dasd_io_nr_req,
379 block->profile.data->dasd_io_nr_req,
380 sizeof(data->dasd_io_nr_req));
381 spin_unlock_bh(&block->profile.lock);
382 } else {
383 spin_unlock_bh(&block->profile.lock);
384 rc = -EIO;
385 goto out;
386 }
387 if (copy_to_user(argp, data, sizeof(*data)))
388 rc = -EFAULT;
389out:
390 kfree(data);
391 return rc;
392}
393#else
394static int dasd_ioctl_reset_profile(struct dasd_block *block)
395{
396 return -ENOTTY;
397}
398
399static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
400{
401 return -ENOTTY;
402}
403#endif
404
405
406
407
408static int dasd_ioctl_information(struct dasd_block *block,
409 unsigned int cmd, void __user *argp)
410{
411 struct dasd_information2_t *dasd_info;
412 struct subchannel_id sch_id;
413 struct ccw_dev_id dev_id;
414 struct dasd_device *base;
415 struct ccw_device *cdev;
416 unsigned long flags;
417 int rc;
418
419 base = block->base;
420 if (!base->discipline || !base->discipline->fill_info)
421 return -EINVAL;
422
423 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
424 if (dasd_info == NULL)
425 return -ENOMEM;
426
427 rc = base->discipline->fill_info(base, dasd_info);
428 if (rc) {
429 kfree(dasd_info);
430 return rc;
431 }
432
433 cdev = base->cdev;
434 ccw_device_get_id(cdev, &dev_id);
435 ccw_device_get_schid(cdev, &sch_id);
436
437 dasd_info->devno = dev_id.devno;
438 dasd_info->schid = sch_id.sch_no;
439 dasd_info->cu_type = cdev->id.cu_type;
440 dasd_info->cu_model = cdev->id.cu_model;
441 dasd_info->dev_type = cdev->id.dev_type;
442 dasd_info->dev_model = cdev->id.dev_model;
443 dasd_info->status = base->state;
444
445
446
447
448
449 dasd_info->open_count = atomic_read(&block->open_count);
450 if (!block->bdev)
451 dasd_info->open_count++;
452
453
454
455
456
457 if ((base->state < DASD_STATE_READY) ||
458 (dasd_check_blocksize(block->bp_block)))
459 dasd_info->format = DASD_FORMAT_NONE;
460
461 dasd_info->features |=
462 ((base->features & DASD_FEATURE_READONLY) != 0);
463
464 memcpy(dasd_info->type, base->discipline->name, 4);
465
466 if (block->request_queue->request_fn) {
467 struct list_head *l;
468#ifdef DASD_EXTENDED_PROFILING
469 {
470 struct list_head *l;
471 spin_lock_irqsave(&block->lock, flags);
472 list_for_each(l, &block->request_queue->queue_head)
473 dasd_info->req_queue_len++;
474 spin_unlock_irqrestore(&block->lock, flags);
475 }
476#endif
477 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
478 list_for_each(l, &base->ccw_queue)
479 dasd_info->chanq_len++;
480 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
481 flags);
482 }
483
484 rc = 0;
485 if (copy_to_user(argp, dasd_info,
486 ((cmd == (unsigned int) BIODASDINFO2) ?
487 sizeof(struct dasd_information2_t) :
488 sizeof(struct dasd_information_t))))
489 rc = -EFAULT;
490 kfree(dasd_info);
491 return rc;
492}
493
494
495
496
497static int
498dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
499{
500 struct dasd_device *base;
501 int intval, rc;
502
503 if (!capable(CAP_SYS_ADMIN))
504 return -EACCES;
505 if (bdev != bdev->bd_contains)
506
507 return -EINVAL;
508 if (get_user(intval, (int __user *)argp))
509 return -EFAULT;
510 base = dasd_device_from_gendisk(bdev->bd_disk);
511 if (!base)
512 return -ENODEV;
513 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
514 dasd_put_device(base);
515 return -EROFS;
516 }
517 set_disk_ro(bdev->bd_disk, intval);
518 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
519 dasd_put_device(base);
520 return rc;
521}
522
523static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
524 struct cmbdata __user *argp)
525{
526 size_t size = _IOC_SIZE(cmd);
527 struct cmbdata data;
528 int ret;
529
530 ret = cmf_readall(block->base->cdev, &data);
531 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
532 return -EFAULT;
533 return ret;
534}
535
536int dasd_ioctl(struct block_device *bdev, fmode_t mode,
537 unsigned int cmd, unsigned long arg)
538{
539 struct dasd_block *block;
540 struct dasd_device *base;
541 void __user *argp;
542 int rc;
543
544 if (is_compat_task())
545 argp = compat_ptr(arg);
546 else
547 argp = (void __user *)arg;
548
549 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
550 PRINT_DEBUG("empty data ptr");
551 return -EINVAL;
552 }
553
554 base = dasd_device_from_gendisk(bdev->bd_disk);
555 if (!base)
556 return -ENODEV;
557 block = base->block;
558 rc = 0;
559 switch (cmd) {
560 case BIODASDDISABLE:
561 rc = dasd_ioctl_disable(bdev);
562 break;
563 case BIODASDENABLE:
564 rc = dasd_ioctl_enable(bdev);
565 break;
566 case BIODASDQUIESCE:
567 rc = dasd_ioctl_quiesce(block);
568 break;
569 case BIODASDRESUME:
570 rc = dasd_ioctl_resume(block);
571 break;
572 case BIODASDABORTIO:
573 rc = dasd_ioctl_abortio(block);
574 break;
575 case BIODASDALLOWIO:
576 rc = dasd_ioctl_allowio(block);
577 break;
578 case BIODASDFMT:
579 rc = dasd_ioctl_format(bdev, argp);
580 break;
581 case BIODASDCHECKFMT:
582 rc = dasd_ioctl_check_format(bdev, argp);
583 break;
584 case BIODASDINFO:
585 rc = dasd_ioctl_information(block, cmd, argp);
586 break;
587 case BIODASDINFO2:
588 rc = dasd_ioctl_information(block, cmd, argp);
589 break;
590 case BIODASDPRRD:
591 rc = dasd_ioctl_read_profile(block, argp);
592 break;
593 case BIODASDPRRST:
594 rc = dasd_ioctl_reset_profile(block);
595 break;
596 case BLKROSET:
597 rc = dasd_ioctl_set_ro(bdev, argp);
598 break;
599 case DASDAPIVER:
600 rc = dasd_ioctl_api_version(argp);
601 break;
602 case BIODASDCMFENABLE:
603 rc = enable_cmf(base->cdev);
604 break;
605 case BIODASDCMFDISABLE:
606 rc = disable_cmf(base->cdev);
607 break;
608 case BIODASDREADALLCMB:
609 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
610 break;
611 default:
612
613 rc = -ENOTTY;
614 if (base->discipline->ioctl)
615 rc = base->discipline->ioctl(block, cmd, argp);
616 }
617 dasd_put_device(base);
618 return rc;
619}
620
