compat: fix compile breakage on s390
[linux-2.6.git] / drivers / s390 / block / dasd_ioctl.c
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 }