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11
12#define KMSG_COMPONENT "dasd"
13
14#include <linux/interrupt.h>
15#include <linux/compat.h>
16#include <linux/major.h>
17#include <linux/fs.h>
18#include <linux/blkpg.h>
19#include <linux/slab.h>
20#include <asm/compat.h>
21#include <asm/ccwdev.h>
22#include <asm/schid.h>
23#include <asm/cmb.h>
24#include <asm/uaccess.h>
25
26
27#define PRINTK_HEADER "dasd_ioctl:"
28
29#include "dasd_int.h"
30
31
32static int
33dasd_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
41
42
43static int
44dasd_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
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
67
68
69static int
70dasd_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
82
83
84
85
86
87
88 dasd_set_target_state(base, DASD_STATE_BASIC);
89
90
91
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
102
103static 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
123
124static 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
145
146static int dasd_ioctl_abortio(struct dasd_block *block)
147{
148 unsigned long flags;
149 struct dasd_device *base;
150 struct dasd_ccw_req *cqr, *n;
151
152 base = block->base;
153 if (!capable(CAP_SYS_ADMIN))
154 return -EACCES;
155
156 if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
157 return 0;
158 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
159
160 spin_lock_irqsave(&block->request_queue_lock, flags);
161 spin_lock(&block->queue_lock);
162 list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
163 if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
164 cqr->callback_data &&
165 cqr->callback_data != DASD_SLEEPON_START_TAG &&
166 cqr->callback_data != DASD_SLEEPON_END_TAG) {
167 spin_unlock(&block->queue_lock);
168 blk_abort_request(cqr->callback_data);
169 spin_lock(&block->queue_lock);
170 }
171 }
172 spin_unlock(&block->queue_lock);
173 spin_unlock_irqrestore(&block->request_queue_lock, flags);
174
175 dasd_schedule_block_bh(block);
176 return 0;
177}
178
179
180
181
182static int dasd_ioctl_allowio(struct dasd_block *block)
183{
184 struct dasd_device *base;
185
186 base = block->base;
187 if (!capable(CAP_SYS_ADMIN))
188 return -EACCES;
189
190 if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
191 DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
192
193 return 0;
194}
195
196
197
198
199
200
201
202static int
203dasd_format(struct dasd_block *block, struct format_data_t *fdata)
204{
205 struct dasd_device *base;
206 int rc;
207
208 base = block->base;
209 if (base->discipline->format_device == NULL)
210 return -EPERM;
211
212 if (base->state != DASD_STATE_BASIC) {
213 pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
214 dev_name(&base->cdev->dev));
215 return -EBUSY;
216 }
217
218 DBF_DEV_EVENT(DBF_NOTICE, base,
219 "formatting units %u to %u (%u B blocks) flags %u",
220 fdata->start_unit,
221 fdata->stop_unit, fdata->blksize, fdata->intensity);
222
223
224
225
226
227
228 if (fdata->start_unit == 0) {
229 struct block_device *bdev = bdget_disk(block->gdp, 0);
230 bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
231 bdput(bdev);
232 }
233
234 rc = base->discipline->format_device(base, fdata, 1);
235 if (rc == -EAGAIN)
236 rc = base->discipline->format_device(base, fdata, 0);
237
238 return rc;
239}
240
241
242
243
244static int
245dasd_ioctl_format(struct block_device *bdev, void __user *argp)
246{
247 struct dasd_device *base;
248 struct format_data_t fdata;
249 int rc;
250
251 if (!capable(CAP_SYS_ADMIN))
252 return -EACCES;
253 if (!argp)
254 return -EINVAL;
255 base = dasd_device_from_gendisk(bdev->bd_disk);
256 if (!base)
257 return -ENODEV;
258 if (base->features & DASD_FEATURE_READONLY ||
259 test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
260 dasd_put_device(base);
261 return -EROFS;
262 }
263 if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
264 dasd_put_device(base);
265 return -EFAULT;
266 }
267 if (bdev != bdev->bd_contains) {
268 pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
269 dev_name(&base->cdev->dev));
270 dasd_put_device(base);
271 return -EINVAL;
272 }
273 rc = dasd_format(base->block, &fdata);
274 dasd_put_device(base);
275 return rc;
276}
277
278#ifdef CONFIG_DASD_PROFILE
279
280
281
282static int dasd_ioctl_reset_profile(struct dasd_block *block)
283{
284 dasd_profile_reset(&block->profile);
285 return 0;
286}
287
288
289
290
291static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
292{
293 struct dasd_profile_info_t *data;
294 int rc = 0;
295
296 data = kmalloc(sizeof(*data), GFP_KERNEL);
297 if (!data)
298 return -ENOMEM;
299
300 spin_lock_bh(&block->profile.lock);
301 if (block->profile.data) {
302 data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
303 data->dasd_io_sects = block->profile.data->dasd_io_sects;
304 memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
305 sizeof(data->dasd_io_secs));
306 memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
307 sizeof(data->dasd_io_times));
308 memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
309 sizeof(data->dasd_io_timps));
310 memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
311 sizeof(data->dasd_io_time1));
312 memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
313 sizeof(data->dasd_io_time2));
314 memcpy(data->dasd_io_time2ps,
315 block->profile.data->dasd_io_time2ps,
316 sizeof(data->dasd_io_time2ps));
317 memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
318 sizeof(data->dasd_io_time3));
319 memcpy(data->dasd_io_nr_req,
320 block->profile.data->dasd_io_nr_req,
321 sizeof(data->dasd_io_nr_req));
322 spin_unlock_bh(&block->profile.lock);
323 } else {
324 spin_unlock_bh(&block->profile.lock);
325 rc = -EIO;
326 goto out;
327 }
328 if (copy_to_user(argp, data, sizeof(*data)))
329 rc = -EFAULT;
330out:
331 kfree(data);
332 return rc;
333}
334#else
335static int dasd_ioctl_reset_profile(struct dasd_block *block)
336{
337 return -ENOTTY;
338}
339
340static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
341{
342 return -ENOTTY;
343}
344#endif
345
346
347
348
349static int dasd_ioctl_information(struct dasd_block *block,
350 unsigned int cmd, void __user *argp)
351{
352 struct dasd_information2_t *dasd_info;
353 struct subchannel_id sch_id;
354 struct ccw_dev_id dev_id;
355 struct dasd_device *base;
356 struct ccw_device *cdev;
357 unsigned long flags;
358 int rc;
359
360 base = block->base;
361 if (!base->discipline || !base->discipline->fill_info)
362 return -EINVAL;
363
364 dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
365 if (dasd_info == NULL)
366 return -ENOMEM;
367
368 rc = base->discipline->fill_info(base, dasd_info);
369 if (rc) {
370 kfree(dasd_info);
371 return rc;
372 }
373
374 cdev = base->cdev;
375 ccw_device_get_id(cdev, &dev_id);
376 ccw_device_get_schid(cdev, &sch_id);
377
378 dasd_info->devno = dev_id.devno;
379 dasd_info->schid = sch_id.sch_no;
380 dasd_info->cu_type = cdev->id.cu_type;
381 dasd_info->cu_model = cdev->id.cu_model;
382 dasd_info->dev_type = cdev->id.dev_type;
383 dasd_info->dev_model = cdev->id.dev_model;
384 dasd_info->status = base->state;
385
386
387
388
389
390 dasd_info->open_count = atomic_read(&block->open_count);
391 if (!block->bdev)
392 dasd_info->open_count++;
393
394
395
396
397
398 if ((base->state < DASD_STATE_READY) ||
399 (dasd_check_blocksize(block->bp_block)))
400 dasd_info->format = DASD_FORMAT_NONE;
401
402 dasd_info->features |=
403 ((base->features & DASD_FEATURE_READONLY) != 0);
404
405 memcpy(dasd_info->type, base->discipline->name, 4);
406
407 if (block->request_queue->request_fn) {
408 struct list_head *l;
409#ifdef DASD_EXTENDED_PROFILING
410 {
411 struct list_head *l;
412 spin_lock_irqsave(&block->lock, flags);
413 list_for_each(l, &block->request_queue->queue_head)
414 dasd_info->req_queue_len++;
415 spin_unlock_irqrestore(&block->lock, flags);
416 }
417#endif
418 spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
419 list_for_each(l, &base->ccw_queue)
420 dasd_info->chanq_len++;
421 spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
422 flags);
423 }
424
425 rc = 0;
426 if (copy_to_user(argp, dasd_info,
427 ((cmd == (unsigned int) BIODASDINFO2) ?
428 sizeof(struct dasd_information2_t) :
429 sizeof(struct dasd_information_t))))
430 rc = -EFAULT;
431 kfree(dasd_info);
432 return rc;
433}
434
435
436
437
438static int
439dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
440{
441 struct dasd_device *base;
442 int intval, rc;
443
444 if (!capable(CAP_SYS_ADMIN))
445 return -EACCES;
446 if (bdev != bdev->bd_contains)
447
448 return -EINVAL;
449 if (get_user(intval, (int __user *)argp))
450 return -EFAULT;
451 base = dasd_device_from_gendisk(bdev->bd_disk);
452 if (!base)
453 return -ENODEV;
454 if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
455 dasd_put_device(base);
456 return -EROFS;
457 }
458 set_disk_ro(bdev->bd_disk, intval);
459 rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
460 dasd_put_device(base);
461 return rc;
462}
463
464static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
465 struct cmbdata __user *argp)
466{
467 size_t size = _IOC_SIZE(cmd);
468 struct cmbdata data;
469 int ret;
470
471 ret = cmf_readall(block->base->cdev, &data);
472 if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
473 return -EFAULT;
474 return ret;
475}
476
477int dasd_ioctl(struct block_device *bdev, fmode_t mode,
478 unsigned int cmd, unsigned long arg)
479{
480 struct dasd_block *block;
481 struct dasd_device *base;
482 void __user *argp;
483 int rc;
484
485 if (is_compat_task())
486 argp = compat_ptr(arg);
487 else
488 argp = (void __user *)arg;
489
490 if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
491 PRINT_DEBUG("empty data ptr");
492 return -EINVAL;
493 }
494
495 base = dasd_device_from_gendisk(bdev->bd_disk);
496 if (!base)
497 return -ENODEV;
498 block = base->block;
499 rc = 0;
500 switch (cmd) {
501 case BIODASDDISABLE:
502 rc = dasd_ioctl_disable(bdev);
503 break;
504 case BIODASDENABLE:
505 rc = dasd_ioctl_enable(bdev);
506 break;
507 case BIODASDQUIESCE:
508 rc = dasd_ioctl_quiesce(block);
509 break;
510 case BIODASDRESUME:
511 rc = dasd_ioctl_resume(block);
512 break;
513 case BIODASDABORTIO:
514 rc = dasd_ioctl_abortio(block);
515 break;
516 case BIODASDALLOWIO:
517 rc = dasd_ioctl_allowio(block);
518 break;
519 case BIODASDFMT:
520 rc = dasd_ioctl_format(bdev, argp);
521 break;
522 case BIODASDINFO:
523 rc = dasd_ioctl_information(block, cmd, argp);
524 break;
525 case BIODASDINFO2:
526 rc = dasd_ioctl_information(block, cmd, argp);
527 break;
528 case BIODASDPRRD:
529 rc = dasd_ioctl_read_profile(block, argp);
530 break;
531 case BIODASDPRRST:
532 rc = dasd_ioctl_reset_profile(block);
533 break;
534 case BLKROSET:
535 rc = dasd_ioctl_set_ro(bdev, argp);
536 break;
537 case DASDAPIVER:
538 rc = dasd_ioctl_api_version(argp);
539 break;
540 case BIODASDCMFENABLE:
541 rc = enable_cmf(base->cdev);
542 break;
543 case BIODASDCMFDISABLE:
544 rc = disable_cmf(base->cdev);
545 break;
546 case BIODASDREADALLCMB:
547 rc = dasd_ioctl_readall_cmb(block, cmd, argp);
548 break;
549 default:
550
551 rc = -ENOTTY;
552 if (base->discipline->ioctl)
553 rc = base->discipline->ioctl(block, cmd, argp);
554 }
555 dasd_put_device(base);
556 return rc;
557}
558
