xref: /openbmc/linux/drivers/s390/block/dasd_ioctl.c (revision 63dc02bd) 
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 
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/cmb.h>
24 #include <asm/uaccess.h>
25 
26 /* This is ugly... */
27 #define PRINTK_HEADER "dasd_ioctl:"
28 
29 #include "dasd_int.h"
30 
31 
32 static int
33 dasd_ioctl_api_version(void __user *argp)
34 {
35 	int ver = DASD_API_VERSION;
36 	return put_user(ver, (int __user *)argp);
37 }
38 
39 /*
40  * Enable device.
41  * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
42  */
43 static int
44 dasd_ioctl_enable(struct block_device *bdev)
45 {
46 	struct dasd_device *base;
47 
48 	if (!capable(CAP_SYS_ADMIN))
49 		return -EACCES;
50 
51 	base = dasd_device_from_gendisk(bdev->bd_disk);
52 	if (!base)
53 		return -ENODEV;
54 
55 	dasd_enable_device(base);
56 	/* Formatting the dasd device can change the capacity. */
57 	mutex_lock(&bdev->bd_mutex);
58 	i_size_write(bdev->bd_inode,
59 		     (loff_t)get_capacity(base->block->gdp) << 9);
60 	mutex_unlock(&bdev->bd_mutex);
61 	dasd_put_device(base);
62 	return 0;
63 }
64 
65 /*
66  * Disable device.
67  * Used by dasdfmt. Disable I/O operations but allow ioctls.
68  */
69 static int
70 dasd_ioctl_disable(struct block_device *bdev)
71 {
72 	struct dasd_device *base;
73 
74 	if (!capable(CAP_SYS_ADMIN))
75 		return -EACCES;
76 
77 	base = dasd_device_from_gendisk(bdev->bd_disk);
78 	if (!base)
79 		return -ENODEV;
80 	/*
81 	 * Man this is sick. We don't do a real disable but only downgrade
82 	 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
83 	 * BIODASDDISABLE to disable accesses to the device via the block
84 	 * device layer but it still wants to do i/o on the device by
85 	 * using the BIODASDFMT ioctl. Therefore the correct state for the
86 	 * device is DASD_STATE_BASIC that allows to do basic i/o.
87 	 */
88 	dasd_set_target_state(base, DASD_STATE_BASIC);
89 	/*
90 	 * Set i_size to zero, since read, write, etc. check against this
91 	 * value.
92 	 */
93 	mutex_lock(&bdev->bd_mutex);
94 	i_size_write(bdev->bd_inode, 0);
95 	mutex_unlock(&bdev->bd_mutex);
96 	dasd_put_device(base);
97 	return 0;
98 }
99 
100 /*
101  * Quiesce device.
102  */
103 static int dasd_ioctl_quiesce(struct dasd_block *block)
104 {
105 	unsigned long flags;
106 	struct dasd_device *base;
107 
108 	base = block->base;
109 	if (!capable (CAP_SYS_ADMIN))
110 		return -EACCES;
111 
112 	pr_info("%s: The DASD has been put in the quiesce "
113 		"state\n", dev_name(&base->cdev->dev));
114 	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
115 	dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
116 	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
117 	return 0;
118 }
119 
120 
121 /*
122  * Resume device.
123  */
124 static int dasd_ioctl_resume(struct dasd_block *block)
125 {
126 	unsigned long flags;
127 	struct dasd_device *base;
128 
129 	base = block->base;
130 	if (!capable (CAP_SYS_ADMIN))
131 		return -EACCES;
132 
133 	pr_info("%s: I/O operations have been resumed "
134 		"on the DASD\n", dev_name(&base->cdev->dev));
135 	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
136 	dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
137 	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
138 
139 	dasd_schedule_block_bh(block);
140 	return 0;
141 }
142 
143 /*
144  * performs formatting of _device_ according to _fdata_
145  * Note: The discipline's format_function is assumed to deliver formatting
146  * commands to format a single unit of the device. In terms of the ECKD
147  * devices this means CCWs are generated to format a single track.
148  */
149 static int dasd_format(struct dasd_block *block, struct format_data_t *fdata)
150 {
151 	struct dasd_ccw_req *cqr;
152 	struct dasd_device *base;
153 	int rc;
154 
155 	base = block->base;
156 	if (base->discipline->format_device == NULL)
157 		return -EPERM;
158 
159 	if (base->state != DASD_STATE_BASIC) {
160 		pr_warning("%s: The DASD cannot be formatted while it is "
161 			   "enabled\n",  dev_name(&base->cdev->dev));
162 		return -EBUSY;
163 	}
164 
165 	DBF_DEV_EVENT(DBF_NOTICE, base,
166 		      "formatting units %u to %u (%u B blocks) flags %u",
167 		      fdata->start_unit,
168 		      fdata->stop_unit, fdata->blksize, fdata->intensity);
169 
170 	/* Since dasdfmt keeps the device open after it was disabled,
171 	 * there still exists an inode for this device.
172 	 * We must update i_blkbits, otherwise we might get errors when
173 	 * enabling the device later.
174 	 */
175 	if (fdata->start_unit == 0) {
176 		struct block_device *bdev = bdget_disk(block->gdp, 0);
177 		bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
178 		bdput(bdev);
179 	}
180 
181 	while (fdata->start_unit <= fdata->stop_unit) {
182 		cqr = base->discipline->format_device(base, fdata);
183 		if (IS_ERR(cqr))
184 			return PTR_ERR(cqr);
185 		rc = dasd_sleep_on_interruptible(cqr);
186 		dasd_sfree_request(cqr, cqr->memdev);
187 		if (rc) {
188 			if (rc != -ERESTARTSYS)
189 				pr_err("%s: Formatting unit %d failed with "
190 				       "rc=%d\n", dev_name(&base->cdev->dev),
191 				       fdata->start_unit, rc);
192 			return rc;
193 		}
194 		fdata->start_unit++;
195 	}
196 	return 0;
197 }
198 
199 /*
200  * Format device.
201  */
202 static int
203 dasd_ioctl_format(struct block_device *bdev, void __user *argp)
204 {
205 	struct dasd_device *base;
206 	struct format_data_t fdata;
207 	int rc;
208 
209 	if (!capable(CAP_SYS_ADMIN))
210 		return -EACCES;
211 	if (!argp)
212 		return -EINVAL;
213 	base = dasd_device_from_gendisk(bdev->bd_disk);
214 	if (!base)
215 		return -ENODEV;
216 	if (base->features & DASD_FEATURE_READONLY ||
217 	    test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
218 		dasd_put_device(base);
219 		return -EROFS;
220 	}
221 	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
222 		dasd_put_device(base);
223 		return -EFAULT;
224 	}
225 	if (bdev != bdev->bd_contains) {
226 		pr_warning("%s: The specified DASD is a partition and cannot "
227 			   "be formatted\n",
228 			   dev_name(&base->cdev->dev));
229 		dasd_put_device(base);
230 		return -EINVAL;
231 	}
232 	rc = dasd_format(base->block, &fdata);
233 	dasd_put_device(base);
234 	return rc;
235 }
236 
237 #ifdef CONFIG_DASD_PROFILE
238 /*
239  * Reset device profile information
240  */
241 static int dasd_ioctl_reset_profile(struct dasd_block *block)
242 {
243 	dasd_profile_reset(&block->profile);
244 	return 0;
245 }
246 
247 /*
248  * Return device profile information
249  */
250 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
251 {
252 	struct dasd_profile_info_t *data;
253 	int rc = 0;
254 
255 	data = kmalloc(sizeof(*data), GFP_KERNEL);
256 	if (!data)
257 		return -ENOMEM;
258 
259 	spin_lock_bh(&block->profile.lock);
260 	if (block->profile.data) {
261 		data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
262 		data->dasd_io_sects = block->profile.data->dasd_io_sects;
263 		memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
264 		       sizeof(data->dasd_io_secs));
265 		memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
266 		       sizeof(data->dasd_io_times));
267 		memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
268 		       sizeof(data->dasd_io_timps));
269 		memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
270 		       sizeof(data->dasd_io_time1));
271 		memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
272 		       sizeof(data->dasd_io_time2));
273 		memcpy(data->dasd_io_time2ps,
274 		       block->profile.data->dasd_io_time2ps,
275 		       sizeof(data->dasd_io_time2ps));
276 		memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
277 		       sizeof(data->dasd_io_time3));
278 		memcpy(data->dasd_io_nr_req,
279 		       block->profile.data->dasd_io_nr_req,
280 		       sizeof(data->dasd_io_nr_req));
281 		spin_unlock_bh(&block->profile.lock);
282 	} else {
283 		spin_unlock_bh(&block->profile.lock);
284 		rc = -EIO;
285 		goto out;
286 	}
287 	if (copy_to_user(argp, data, sizeof(*data)))
288 		rc = -EFAULT;
289 out:
290 	kfree(data);
291 	return rc;
292 }
293 #else
294 static int dasd_ioctl_reset_profile(struct dasd_block *block)
295 {
296 	return -ENOSYS;
297 }
298 
299 static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
300 {
301 	return -ENOSYS;
302 }
303 #endif
304 
305 /*
306  * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
307  */
308 static int dasd_ioctl_information(struct dasd_block *block,
309 				  unsigned int cmd, void __user *argp)
310 {
311 	struct dasd_information2_t *dasd_info;
312 	unsigned long flags;
313 	int rc;
314 	struct dasd_device *base;
315 	struct ccw_device *cdev;
316 	struct ccw_dev_id dev_id;
317 
318 	base = block->base;
319 	if (!base->discipline || !base->discipline->fill_info)
320 		return -EINVAL;
321 
322 	dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
323 	if (dasd_info == NULL)
324 		return -ENOMEM;
325 
326 	rc = base->discipline->fill_info(base, dasd_info);
327 	if (rc) {
328 		kfree(dasd_info);
329 		return rc;
330 	}
331 
332 	cdev = base->cdev;
333 	ccw_device_get_id(cdev, &dev_id);
334 
335 	dasd_info->devno = dev_id.devno;
336 	dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev);
337 	dasd_info->cu_type = cdev->id.cu_type;
338 	dasd_info->cu_model = cdev->id.cu_model;
339 	dasd_info->dev_type = cdev->id.dev_type;
340 	dasd_info->dev_model = cdev->id.dev_model;
341 	dasd_info->status = base->state;
342 	/*
343 	 * The open_count is increased for every opener, that includes
344 	 * the blkdev_get in dasd_scan_partitions.
345 	 * This must be hidden from user-space.
346 	 */
347 	dasd_info->open_count = atomic_read(&block->open_count);
348 	if (!block->bdev)
349 		dasd_info->open_count++;
350 
351 	/*
352 	 * check if device is really formatted
353 	 * LDL / CDL was returned by 'fill_info'
354 	 */
355 	if ((base->state < DASD_STATE_READY) ||
356 	    (dasd_check_blocksize(block->bp_block)))
357 		dasd_info->format = DASD_FORMAT_NONE;
358 
359 	dasd_info->features |=
360 		((base->features & DASD_FEATURE_READONLY) != 0);
361 
362 	memcpy(dasd_info->type, base->discipline->name, 4);
363 
364 	if (block->request_queue->request_fn) {
365 		struct list_head *l;
366 #ifdef DASD_EXTENDED_PROFILING
367 		{
368 			struct list_head *l;
369 			spin_lock_irqsave(&block->lock, flags);
370 			list_for_each(l, &block->request_queue->queue_head)
371 				dasd_info->req_queue_len++;
372 			spin_unlock_irqrestore(&block->lock, flags);
373 		}
374 #endif				/* DASD_EXTENDED_PROFILING */
375 		spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
376 		list_for_each(l, &base->ccw_queue)
377 			dasd_info->chanq_len++;
378 		spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
379 				       flags);
380 	}
381 
382 	rc = 0;
383 	if (copy_to_user(argp, dasd_info,
384 			 ((cmd == (unsigned int) BIODASDINFO2) ?
385 			  sizeof(struct dasd_information2_t) :
386 			  sizeof(struct dasd_information_t))))
387 		rc = -EFAULT;
388 	kfree(dasd_info);
389 	return rc;
390 }
391 
392 /*
393  * Set read only
394  */
395 static int
396 dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
397 {
398 	struct dasd_device *base;
399 	int intval, rc;
400 
401 	if (!capable(CAP_SYS_ADMIN))
402 		return -EACCES;
403 	if (bdev != bdev->bd_contains)
404 		// ro setting is not allowed for partitions
405 		return -EINVAL;
406 	if (get_user(intval, (int __user *)argp))
407 		return -EFAULT;
408 	base = dasd_device_from_gendisk(bdev->bd_disk);
409 	if (!base)
410 		return -ENODEV;
411 	if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
412 		dasd_put_device(base);
413 		return -EROFS;
414 	}
415 	set_disk_ro(bdev->bd_disk, intval);
416 	rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
417 	dasd_put_device(base);
418 	return rc;
419 }
420 
421 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
422 				  struct cmbdata __user *argp)
423 {
424 	size_t size = _IOC_SIZE(cmd);
425 	struct cmbdata data;
426 	int ret;
427 
428 	ret = cmf_readall(block->base->cdev, &data);
429 	if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
430 		return -EFAULT;
431 	return ret;
432 }
433 
434 int dasd_ioctl(struct block_device *bdev, fmode_t mode,
435 	       unsigned int cmd, unsigned long arg)
436 {
437 	struct dasd_block *block;
438 	struct dasd_device *base;
439 	void __user *argp;
440 	int rc;
441 
442 	if (is_compat_task())
443 		argp = compat_ptr(arg);
444 	else
445 		argp = (void __user *)arg;
446 
447 	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
448 		PRINT_DEBUG("empty data ptr");
449 		return -EINVAL;
450 	}
451 
452 	base = dasd_device_from_gendisk(bdev->bd_disk);
453 	if (!base)
454 		return -ENODEV;
455 	block = base->block;
456 	rc = 0;
457 	switch (cmd) {
458 	case BIODASDDISABLE:
459 		rc = dasd_ioctl_disable(bdev);
460 		break;
461 	case BIODASDENABLE:
462 		rc = dasd_ioctl_enable(bdev);
463 		break;
464 	case BIODASDQUIESCE:
465 		rc = dasd_ioctl_quiesce(block);
466 		break;
467 	case BIODASDRESUME:
468 		rc = dasd_ioctl_resume(block);
469 		break;
470 	case BIODASDFMT:
471 		rc = dasd_ioctl_format(bdev, argp);
472 		break;
473 	case BIODASDINFO:
474 		rc = dasd_ioctl_information(block, cmd, argp);
475 		break;
476 	case BIODASDINFO2:
477 		rc = dasd_ioctl_information(block, cmd, argp);
478 		break;
479 	case BIODASDPRRD:
480 		rc = dasd_ioctl_read_profile(block, argp);
481 		break;
482 	case BIODASDPRRST:
483 		rc = dasd_ioctl_reset_profile(block);
484 		break;
485 	case BLKROSET:
486 		rc = dasd_ioctl_set_ro(bdev, argp);
487 		break;
488 	case DASDAPIVER:
489 		rc = dasd_ioctl_api_version(argp);
490 		break;
491 	case BIODASDCMFENABLE:
492 		rc = enable_cmf(base->cdev);
493 		break;
494 	case BIODASDCMFDISABLE:
495 		rc = disable_cmf(base->cdev);
496 		break;
497 	case BIODASDREADALLCMB:
498 		rc = dasd_ioctl_readall_cmb(block, cmd, argp);
499 		break;
500 	default:
501 		/* if the discipline has an ioctl method try it. */
502 		if (base->discipline->ioctl) {
503 			rc = base->discipline->ioctl(block, cmd, argp);
504 			if (rc == -ENOIOCTLCMD)
505 				rc = -EINVAL;
506 		} else
507 			rc = -EINVAL;
508 	}
509 	dasd_put_device(base);
510 	return rc;
511 }
512