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
dasd_ioctl_api_version(void __user * argp)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
dasd_ioctl_enable(struct block_device * bdev)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
dasd_ioctl_disable(struct block_device * bdev)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 */
dasd_ioctl_quiesce(struct dasd_block * block)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 */
dasd_ioctl_resume(struct dasd_block * block)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 */
dasd_format(struct dasd_block * block,struct format_data_t * fdata)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
dasd_ioctl_format(struct block_device * bdev,void __user * argp)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 */
dasd_ioctl_reset_profile(struct dasd_block * block)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 */
dasd_ioctl_read_profile(struct dasd_block * block,void __user * argp)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
dasd_ioctl_reset_profile(struct dasd_block * block)294 static int dasd_ioctl_reset_profile(struct dasd_block *block)
295 {
296 return -ENOSYS;
297 }
298
dasd_ioctl_read_profile(struct dasd_block * block,void __user * argp)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 */
dasd_ioctl_information(struct dasd_block * block,unsigned int cmd,void __user * argp)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
dasd_ioctl_set_ro(struct block_device * bdev,void __user * argp)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
dasd_ioctl_readall_cmb(struct dasd_block * block,unsigned int cmd,struct cmbdata __user * argp)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
dasd_ioctl(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)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