aboutsummaryrefslogtreecommitdiff
path: root/drivers/s390/block/dasd_ioctl.c
blob: 03c0e044455335df0c6d3a0cc5defbf5c15dd0a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
/*
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *		    Horst Hummel <Horst.Hummel@de.ibm.com>
 *		    Carsten Otte <Cotte@de.ibm.com>
 *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * Copyright IBM Corp. 1999, 2001
 *
 * i/o controls for the dasd driver.
 */

#define KMSG_COMPONENT "dasd"

#include <linux/interrupt.h>
#include <linux/compat.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <asm/compat.h>
#include <asm/ccwdev.h>
#include <asm/schid.h>
#include <asm/cmb.h>
#include <asm/uaccess.h>

/* This is ugly... */
#define PRINTK_HEADER "dasd_ioctl:"

#include "dasd_int.h"


static int
dasd_ioctl_api_version(void __user *argp)
{
	int ver = DASD_API_VERSION;
	return put_user(ver, (int __user *)argp);
}

/*
 * Enable device.
 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
 */
static int
dasd_ioctl_enable(struct block_device *bdev)
{
	struct dasd_device *base;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;

	dasd_enable_device(base);
	/* Formatting the dasd device can change the capacity. */
	mutex_lock(&bdev->bd_mutex);
	i_size_write(bdev->bd_inode,
		     (loff_t)get_capacity(base->block->gdp) << 9);
	mutex_unlock(&bdev->bd_mutex);
	dasd_put_device(base);
	return 0;
}

/*
 * Disable device.
 * Used by dasdfmt. Disable I/O operations but allow ioctls.
 */
static int
dasd_ioctl_disable(struct block_device *bdev)
{
	struct dasd_device *base;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	/*
	 * Man this is sick. We don't do a real disable but only downgrade
	 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
	 * BIODASDDISABLE to disable accesses to the device via the block
	 * device layer but it still wants to do i/o on the device by
	 * using the BIODASDFMT ioctl. Therefore the correct state for the
	 * device is DASD_STATE_BASIC that allows to do basic i/o.
	 */
	dasd_set_target_state(base, DASD_STATE_BASIC);
	/*
	 * Set i_size to zero, since read, write, etc. check against this
	 * value.
	 */
	mutex_lock(&bdev->bd_mutex);
	i_size_write(bdev->bd_inode, 0);
	mutex_unlock(&bdev->bd_mutex);
	dasd_put_device(base);
	return 0;
}

/*
 * Quiesce device.
 */
static int dasd_ioctl_quiesce(struct dasd_block *block)
{
	unsigned long flags;
	struct dasd_device *base;

	base = block->base;
	if (!capable (CAP_SYS_ADMIN))
		return -EACCES;

	pr_info("%s: The DASD has been put in the quiesce "
		"state\n", dev_name(&base->cdev->dev));
	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
	dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
	return 0;
}


/*
 * Resume device.
 */
static int dasd_ioctl_resume(struct dasd_block *block)
{
	unsigned long flags;
	struct dasd_device *base;

	base = block->base;
	if (!capable (CAP_SYS_ADMIN))
		return -EACCES;

	pr_info("%s: I/O operations have been resumed "
		"on the DASD\n", dev_name(&base->cdev->dev));
	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
	dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);

	dasd_schedule_block_bh(block);
	return 0;
}

/*
 * performs formatting of _device_ according to _fdata_
 * Note: The discipline's format_function is assumed to deliver formatting
 * commands to format a single unit of the device. In terms of the ECKD
 * devices this means CCWs are generated to format a single track.
 */
static int dasd_format(struct dasd_block *block, struct format_data_t *fdata)
{
	struct dasd_ccw_req *cqr;
	struct dasd_device *base;
	int rc;

	base = block->base;
	if (base->discipline->format_device == NULL)
		return -EPERM;

	if (base->state != DASD_STATE_BASIC) {
		pr_warning("%s: The DASD cannot be formatted while it is "
			   "enabled\n",  dev_name(&base->cdev->dev));
		return -EBUSY;
	}

	DBF_DEV_EVENT(DBF_NOTICE, base,
		      "formatting units %u to %u (%u B blocks) flags %u",
		      fdata->start_unit,
		      fdata->stop_unit, fdata->blksize, fdata->intensity);

	/* Since dasdfmt keeps the device open after it was disabled,
	 * there still exists an inode for this device.
	 * We must update i_blkbits, otherwise we might get errors when
	 * enabling the device later.
	 */
	if (fdata->start_unit == 0) {
		struct block_device *bdev = bdget_disk(block->gdp, 0);
		bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
		bdput(bdev);
	}

	while (fdata->start_unit <= fdata->stop_unit) {
		cqr = base->discipline->format_device(base, fdata);
		if (IS_ERR(cqr))
			return PTR_ERR(cqr);
		rc = dasd_sleep_on_interruptible(cqr);
		dasd_sfree_request(cqr, cqr->memdev);
		if (rc) {
			if (rc != -ERESTARTSYS)
				pr_err("%s: Formatting unit %d failed with "
				       "rc=%d\n", dev_name(&base->cdev->dev),
				       fdata->start_unit, rc);
			return rc;
		}
		fdata->start_unit++;
	}
	return 0;
}

/*
 * Format device.
 */
static int
dasd_ioctl_format(struct block_device *bdev, void __user *argp)
{
	struct dasd_device *base;
	struct format_data_t fdata;
	int rc;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!argp)
		return -EINVAL;
	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	if (base->features & DASD_FEATURE_READONLY ||
	    test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
		dasd_put_device(base);
		return -EROFS;
	}
	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
		dasd_put_device(base);
		return -EFAULT;
	}
	if (bdev != bdev->bd_contains) {
		pr_warning("%s: The specified DASD is a partition and cannot "
			   "be formatted\n",
			   dev_name(&base->cdev->dev));
		dasd_put_device(base);
		return -EINVAL;
	}
	rc = dasd_format(base->block, &fdata);
	dasd_put_device(base);
	return rc;
}

#ifdef CONFIG_DASD_PROFILE
/*
 * Reset device profile information
 */
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
	dasd_profile_reset(&block->profile);
	return 0;
}

/*
 * Return device profile information
 */
static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
{
	struct dasd_profile_info_t *data;
	int rc = 0;

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	spin_lock_bh(&block->profile.lock);
	if (block->profile.data) {
		data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
		data->dasd_io_sects = block->profile.data->dasd_io_sects;
		memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
		       sizeof(data->dasd_io_secs));
		memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
		       sizeof(data->dasd_io_times));
		memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
		       sizeof(data->dasd_io_timps));
		memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
		       sizeof(data->dasd_io_time1));
		memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
		       sizeof(data->dasd_io_time2));
		memcpy(data->dasd_io_time2ps,
		       block->profile.data->dasd_io_time2ps,
		       sizeof(data->dasd_io_time2ps));
		memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
		       sizeof(data->dasd_io_time3));
		memcpy(data->dasd_io_nr_req,
		       block->profile.data->dasd_io_nr_req,
		       sizeof(data->dasd_io_nr_req));
		spin_unlock_bh(&block->profile.lock);
	} else {
		spin_unlock_bh(&block->profile.lock);
		rc = -EIO;
		goto out;
	}
	if (copy_to_user(argp, data, sizeof(*data)))
		rc = -EFAULT;
out:
	kfree(data);
	return rc;
}
#else
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
	return -ENOTTY;
}

static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
{
	return -ENOTTY;
}
#endif

/*
 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
 */
static int dasd_ioctl_information(struct dasd_block *block,
				  unsigned int cmd, void __user *argp)
{
	struct dasd_information2_t *dasd_info;
	struct subchannel_id sch_id;
	struct ccw_dev_id dev_id;
	struct dasd_device *base;
	struct ccw_device *cdev;
	unsigned long flags;
	int rc;

	base = block->base;
	if (!base->discipline || !base->discipline->fill_info)
		return -EINVAL;

	dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
	if (dasd_info == NULL)
		return -ENOMEM;

	rc = base->discipline->fill_info(base, dasd_info);
	if (rc) {
		kfree(dasd_info);
		return rc;
	}

	cdev = base->cdev;
	ccw_device_get_id(cdev, &dev_id);
	ccw_device_get_schid(cdev, &sch_id);

	dasd_info->devno = dev_id.devno;
	dasd_info->schid = sch_id.sch_no;
	dasd_info->cu_type = cdev->id.cu_type;
	dasd_info->cu_model = cdev->id.cu_model;
	dasd_info->dev_type = cdev->id.dev_type;
	dasd_info->dev_model = cdev->id.dev_model;
	dasd_info->status = base->state;
	/*
	 * The open_count is increased for every opener, that includes
	 * the blkdev_get in dasd_scan_partitions.
	 * This must be hidden from user-space.
	 */
	dasd_info->open_count = atomic_read(&block->open_count);
	if (!block->bdev)
		dasd_info->open_count++;

	/*
	 * check if device is really formatted
	 * LDL / CDL was returned by 'fill_info'
	 */
	if ((base->state < DASD_STATE_READY) ||
	    (dasd_check_blocksize(block->bp_block)))
		dasd_info->format = DASD_FORMAT_NONE;

	dasd_info->features |=
		((base->features & DASD_FEATURE_READONLY) != 0);

	memcpy(dasd_info->type, base->discipline->name, 4);

	if (block->request_queue->request_fn) {
		struct list_head *l;
#ifdef DASD_EXTENDED_PROFILING
		{
			struct list_head *l;
			spin_lock_irqsave(&block->lock, flags);
			list_for_each(l, &block->request_queue->queue_head)
				dasd_info->req_queue_len++;
			spin_unlock_irqrestore(&block->lock, flags);
		}
#endif				/* DASD_EXTENDED_PROFILING */
		spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
		list_for_each(l, &base->ccw_queue)
			dasd_info->chanq_len++;
		spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
				       flags);
	}

	rc = 0;
	if (copy_to_user(argp, dasd_info,
			 ((cmd == (unsigned int) BIODASDINFO2) ?
			  sizeof(struct dasd_information2_t) :
			  sizeof(struct dasd_information_t))))
		rc = -EFAULT;
	kfree(dasd_info);
	return rc;
}

/*
 * Set read only
 */
static int
dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
{
	struct dasd_device *base;
	int intval, rc;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (bdev != bdev->bd_contains)
		// ro setting is not allowed for partitions
		return -EINVAL;
	if (get_user(intval, (int __user *)argp))
		return -EFAULT;
	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
		dasd_put_device(base);
		return -EROFS;
	}
	set_disk_ro(bdev->bd_disk, intval);
	rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
	dasd_put_device(base);
	return rc;
}

static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
				  struct cmbdata __user *argp)
{
	size_t size = _IOC_SIZE(cmd);
	struct cmbdata data;
	int ret;

	ret = cmf_readall(block->base->cdev, &data);
	if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
		return -EFAULT;
	return ret;
}

int dasd_ioctl(struct block_device *bdev, fmode_t mode,
	       unsigned int cmd, unsigned long arg)
{
	struct dasd_block *block;
	struct dasd_device *base;
	void __user *argp;
	int rc;

	if (is_compat_task())
		argp = compat_ptr(arg);
	else
		argp = (void __user *)arg;

	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
		PRINT_DEBUG("empty data ptr");
		return -EINVAL;
	}

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	block = base->block;
	rc = 0;
	switch (cmd) {
	case BIODASDDISABLE:
		rc = dasd_ioctl_disable(bdev);
		break;
	case BIODASDENABLE:
		rc = dasd_ioctl_enable(bdev);
		break;
	case BIODASDQUIESCE:
		rc = dasd_ioctl_quiesce(block);
		break;
	case BIODASDRESUME:
		rc = dasd_ioctl_resume(block);
		break;
	case BIODASDFMT:
		rc = dasd_ioctl_format(bdev, argp);
		break;
	case BIODASDINFO:
		rc = dasd_ioctl_information(block, cmd, argp);
		break;
	case BIODASDINFO2:
		rc = dasd_ioctl_information(block, cmd, argp);
		break;
	case BIODASDPRRD:
		rc = dasd_ioctl_read_profile(block, argp);
		break;
	case BIODASDPRRST:
		rc = dasd_ioctl_reset_profile(block);
		break;
	case BLKROSET:
		rc = dasd_ioctl_set_ro(bdev, argp);
		break;
	case DASDAPIVER:
		rc = dasd_ioctl_api_version(argp);
		break;
	case BIODASDCMFENABLE:
		rc = enable_cmf(base->cdev);
		break;
	case BIODASDCMFDISABLE:
		rc = disable_cmf(base->cdev);
		break;
	case BIODASDREADALLCMB:
		rc = dasd_ioctl_readall_cmb(block, cmd, argp);
		break;
	default:
		/* if the discipline has an ioctl method try it. */
		rc = -ENOTTY;
		if (base->discipline->ioctl)
			rc = base->discipline->ioctl(block, cmd, argp);
	}
	dasd_put_device(base);
	return rc;
}