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Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
fc19f381 SH |
12 | |
13 | #define KMSG_COMPONENT "dasd" | |
14 | ||
1da177e4 LT |
15 | #include <linux/interrupt.h> |
16 | #include <linux/major.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/blkpg.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
88034865 | 20 | #include <asm/compat.h> |
1da177e4 | 21 | #include <asm/ccwdev.h> |
8b2eb664 | 22 | #include <asm/cmb.h> |
1da177e4 LT |
23 | #include <asm/uaccess.h> |
24 | ||
25 | /* This is ugly... */ | |
26 | #define PRINTK_HEADER "dasd_ioctl:" | |
27 | ||
28 | #include "dasd_int.h" | |
29 | ||
1da177e4 | 30 | |
1da177e4 | 31 | static int |
13c6204f | 32 | dasd_ioctl_api_version(void __user *argp) |
1da177e4 LT |
33 | { |
34 | int ver = DASD_API_VERSION; | |
b5029622 | 35 | return put_user(ver, (int __user *)argp); |
1da177e4 LT |
36 | } |
37 | ||
38 | /* | |
39 | * Enable device. | |
40 | * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection | |
41 | */ | |
42 | static int | |
13c6204f | 43 | dasd_ioctl_enable(struct block_device *bdev) |
1da177e4 | 44 | { |
65f8da47 | 45 | struct dasd_device *base; |
1da177e4 LT |
46 | |
47 | if (!capable(CAP_SYS_ADMIN)) | |
48 | return -EACCES; | |
13c6204f | 49 | |
65f8da47 SW |
50 | base = dasd_device_from_gendisk(bdev->bd_disk); |
51 | if (!base) | |
52 | return -ENODEV; | |
53 | ||
54 | dasd_enable_device(base); | |
1da177e4 | 55 | /* Formatting the dasd device can change the capacity. */ |
c039e313 | 56 | mutex_lock(&bdev->bd_mutex); |
65f8da47 SW |
57 | i_size_write(bdev->bd_inode, |
58 | (loff_t)get_capacity(base->block->gdp) << 9); | |
c039e313 | 59 | mutex_unlock(&bdev->bd_mutex); |
65f8da47 | 60 | dasd_put_device(base); |
1da177e4 LT |
61 | return 0; |
62 | } | |
63 | ||
64 | /* | |
65 | * Disable device. | |
66 | * Used by dasdfmt. Disable I/O operations but allow ioctls. | |
67 | */ | |
68 | static int | |
13c6204f | 69 | dasd_ioctl_disable(struct block_device *bdev) |
1da177e4 | 70 | { |
65f8da47 | 71 | struct dasd_device *base; |
1da177e4 LT |
72 | |
73 | if (!capable(CAP_SYS_ADMIN)) | |
74 | return -EACCES; | |
13c6204f | 75 | |
65f8da47 SW |
76 | base = dasd_device_from_gendisk(bdev->bd_disk); |
77 | if (!base) | |
78 | return -ENODEV; | |
1da177e4 LT |
79 | /* |
80 | * Man this is sick. We don't do a real disable but only downgrade | |
81 | * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses | |
82 | * BIODASDDISABLE to disable accesses to the device via the block | |
83 | * device layer but it still wants to do i/o on the device by | |
84 | * using the BIODASDFMT ioctl. Therefore the correct state for the | |
85 | * device is DASD_STATE_BASIC that allows to do basic i/o. | |
86 | */ | |
65f8da47 | 87 | dasd_set_target_state(base, DASD_STATE_BASIC); |
1da177e4 LT |
88 | /* |
89 | * Set i_size to zero, since read, write, etc. check against this | |
90 | * value. | |
91 | */ | |
c039e313 | 92 | mutex_lock(&bdev->bd_mutex); |
1da177e4 | 93 | i_size_write(bdev->bd_inode, 0); |
c039e313 | 94 | mutex_unlock(&bdev->bd_mutex); |
65f8da47 | 95 | dasd_put_device(base); |
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
99 | /* | |
100 | * Quiesce device. | |
101 | */ | |
8e09f215 | 102 | static int dasd_ioctl_quiesce(struct dasd_block *block) |
1da177e4 | 103 | { |
1da177e4 | 104 | unsigned long flags; |
8e09f215 | 105 | struct dasd_device *base; |
138c014d | 106 | |
8e09f215 | 107 | base = block->base; |
1da177e4 LT |
108 | if (!capable (CAP_SYS_ADMIN)) |
109 | return -EACCES; | |
138c014d | 110 | |
ca99dab0 SH |
111 | pr_info("%s: The DASD has been put in the quiesce " |
112 | "state\n", dev_name(&base->cdev->dev)); | |
8e09f215 | 113 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
eb6e199b | 114 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 | 115 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
1da177e4 LT |
116 | return 0; |
117 | } | |
118 | ||
119 | ||
120 | /* | |
fc19f381 | 121 | * Resume device. |
1da177e4 | 122 | */ |
8e09f215 | 123 | static int dasd_ioctl_resume(struct dasd_block *block) |
1da177e4 | 124 | { |
1da177e4 | 125 | unsigned long flags; |
8e09f215 | 126 | struct dasd_device *base; |
138c014d | 127 | |
8e09f215 | 128 | base = block->base; |
138c014d | 129 | if (!capable (CAP_SYS_ADMIN)) |
1da177e4 LT |
130 | return -EACCES; |
131 | ||
ca99dab0 SH |
132 | pr_info("%s: I/O operations have been resumed " |
133 | "on the DASD\n", dev_name(&base->cdev->dev)); | |
8e09f215 | 134 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
eb6e199b | 135 | dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 | 136 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
1da177e4 | 137 | |
8e09f215 | 138 | dasd_schedule_block_bh(block); |
1da177e4 LT |
139 | return 0; |
140 | } | |
141 | ||
142 | /* | |
143 | * performs formatting of _device_ according to _fdata_ | |
144 | * Note: The discipline's format_function is assumed to deliver formatting | |
145 | * commands to format a single unit of the device. In terms of the ECKD | |
146 | * devices this means CCWs are generated to format a single track. | |
147 | */ | |
8e09f215 | 148 | static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) |
1da177e4 LT |
149 | { |
150 | struct dasd_ccw_req *cqr; | |
8e09f215 | 151 | struct dasd_device *base; |
1da177e4 LT |
152 | int rc; |
153 | ||
8e09f215 SW |
154 | base = block->base; |
155 | if (base->discipline->format_device == NULL) | |
1da177e4 LT |
156 | return -EPERM; |
157 | ||
8e09f215 | 158 | if (base->state != DASD_STATE_BASIC) { |
ca99dab0 SH |
159 | pr_warning("%s: The DASD cannot be formatted while it is " |
160 | "enabled\n", dev_name(&base->cdev->dev)); | |
1da177e4 LT |
161 | return -EBUSY; |
162 | } | |
163 | ||
8e09f215 | 164 | DBF_DEV_EVENT(DBF_NOTICE, base, |
b44b0ab3 | 165 | "formatting units %u to %u (%u B blocks) flags %u", |
1da177e4 LT |
166 | fdata->start_unit, |
167 | fdata->stop_unit, fdata->blksize, fdata->intensity); | |
168 | ||
169 | /* Since dasdfmt keeps the device open after it was disabled, | |
170 | * there still exists an inode for this device. | |
171 | * We must update i_blkbits, otherwise we might get errors when | |
172 | * enabling the device later. | |
173 | */ | |
174 | if (fdata->start_unit == 0) { | |
8e09f215 | 175 | struct block_device *bdev = bdget_disk(block->gdp, 0); |
1da177e4 LT |
176 | bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); |
177 | bdput(bdev); | |
178 | } | |
179 | ||
180 | while (fdata->start_unit <= fdata->stop_unit) { | |
8e09f215 | 181 | cqr = base->discipline->format_device(base, fdata); |
1da177e4 LT |
182 | if (IS_ERR(cqr)) |
183 | return PTR_ERR(cqr); | |
184 | rc = dasd_sleep_on_interruptible(cqr); | |
8e09f215 | 185 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
186 | if (rc) { |
187 | if (rc != -ERESTARTSYS) | |
ca99dab0 SH |
188 | pr_err("%s: Formatting unit %d failed with " |
189 | "rc=%d\n", dev_name(&base->cdev->dev), | |
190 | fdata->start_unit, rc); | |
1da177e4 LT |
191 | return rc; |
192 | } | |
193 | fdata->start_unit++; | |
194 | } | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Format device. | |
200 | */ | |
201 | static int | |
13c6204f | 202 | dasd_ioctl_format(struct block_device *bdev, void __user *argp) |
1da177e4 | 203 | { |
65f8da47 | 204 | struct dasd_device *base; |
1da177e4 | 205 | struct format_data_t fdata; |
65f8da47 | 206 | int rc; |
1da177e4 LT |
207 | |
208 | if (!capable(CAP_SYS_ADMIN)) | |
209 | return -EACCES; | |
13c6204f | 210 | if (!argp) |
1da177e4 | 211 | return -EINVAL; |
65f8da47 SW |
212 | base = dasd_device_from_gendisk(bdev->bd_disk); |
213 | if (!base) | |
214 | return -ENODEV; | |
215 | if (base->features & DASD_FEATURE_READONLY || | |
216 | test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { | |
217 | dasd_put_device(base); | |
1da177e4 | 218 | return -EROFS; |
65f8da47 SW |
219 | } |
220 | if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) { | |
221 | dasd_put_device(base); | |
1da177e4 | 222 | return -EFAULT; |
65f8da47 | 223 | } |
1da177e4 | 224 | if (bdev != bdev->bd_contains) { |
ca99dab0 SH |
225 | pr_warning("%s: The specified DASD is a partition and cannot " |
226 | "be formatted\n", | |
65f8da47 SW |
227 | dev_name(&base->cdev->dev)); |
228 | dasd_put_device(base); | |
1da177e4 LT |
229 | return -EINVAL; |
230 | } | |
65f8da47 SW |
231 | rc = dasd_format(base->block, &fdata); |
232 | dasd_put_device(base); | |
233 | return rc; | |
1da177e4 LT |
234 | } |
235 | ||
236 | #ifdef CONFIG_DASD_PROFILE | |
237 | /* | |
238 | * Reset device profile information | |
239 | */ | |
8e09f215 | 240 | static int dasd_ioctl_reset_profile(struct dasd_block *block) |
1da177e4 | 241 | { |
8e09f215 | 242 | memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
243 | return 0; |
244 | } | |
245 | ||
246 | /* | |
247 | * Return device profile information | |
248 | */ | |
8e09f215 | 249 | static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
1da177e4 | 250 | { |
9a7af289 HH |
251 | if (dasd_profile_level == DASD_PROFILE_OFF) |
252 | return -EIO; | |
8e09f215 SW |
253 | if (copy_to_user(argp, &block->profile, |
254 | sizeof(struct dasd_profile_info_t))) | |
1da177e4 LT |
255 | return -EFAULT; |
256 | return 0; | |
257 | } | |
258 | #else | |
8e09f215 | 259 | static int dasd_ioctl_reset_profile(struct dasd_block *block) |
1da177e4 LT |
260 | { |
261 | return -ENOSYS; | |
262 | } | |
263 | ||
8e09f215 | 264 | static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
1da177e4 LT |
265 | { |
266 | return -ENOSYS; | |
267 | } | |
268 | #endif | |
269 | ||
270 | /* | |
271 | * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. | |
272 | */ | |
8e09f215 SW |
273 | static int dasd_ioctl_information(struct dasd_block *block, |
274 | unsigned int cmd, void __user *argp) | |
1da177e4 | 275 | { |
1da177e4 LT |
276 | struct dasd_information2_t *dasd_info; |
277 | unsigned long flags; | |
c6eb7b77 | 278 | int rc; |
8e09f215 | 279 | struct dasd_device *base; |
1da177e4 | 280 | struct ccw_device *cdev; |
9a92fe48 | 281 | struct ccw_dev_id dev_id; |
1da177e4 | 282 | |
8e09f215 | 283 | base = block->base; |
294001a8 | 284 | if (!base->discipline || !base->discipline->fill_info) |
1da177e4 LT |
285 | return -EINVAL; |
286 | ||
554a826e | 287 | dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); |
1da177e4 LT |
288 | if (dasd_info == NULL) |
289 | return -ENOMEM; | |
290 | ||
8e09f215 | 291 | rc = base->discipline->fill_info(base, dasd_info); |
1da177e4 LT |
292 | if (rc) { |
293 | kfree(dasd_info); | |
294 | return rc; | |
295 | } | |
296 | ||
8e09f215 | 297 | cdev = base->cdev; |
9a92fe48 | 298 | ccw_device_get_id(cdev, &dev_id); |
1da177e4 | 299 | |
9a92fe48 | 300 | dasd_info->devno = dev_id.devno; |
8e09f215 | 301 | dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); |
1da177e4 LT |
302 | dasd_info->cu_type = cdev->id.cu_type; |
303 | dasd_info->cu_model = cdev->id.cu_model; | |
304 | dasd_info->dev_type = cdev->id.dev_type; | |
305 | dasd_info->dev_model = cdev->id.dev_model; | |
8e09f215 | 306 | dasd_info->status = base->state; |
57467195 HH |
307 | /* |
308 | * The open_count is increased for every opener, that includes | |
309 | * the blkdev_get in dasd_scan_partitions. | |
310 | * This must be hidden from user-space. | |
311 | */ | |
8e09f215 SW |
312 | dasd_info->open_count = atomic_read(&block->open_count); |
313 | if (!block->bdev) | |
57467195 | 314 | dasd_info->open_count++; |
138c014d | 315 | |
1da177e4 LT |
316 | /* |
317 | * check if device is really formatted | |
318 | * LDL / CDL was returned by 'fill_info' | |
319 | */ | |
8e09f215 SW |
320 | if ((base->state < DASD_STATE_READY) || |
321 | (dasd_check_blocksize(block->bp_block))) | |
1da177e4 | 322 | dasd_info->format = DASD_FORMAT_NONE; |
f24acd45 | 323 | |
c6eb7b77 | 324 | dasd_info->features |= |
8e09f215 | 325 | ((base->features & DASD_FEATURE_READONLY) != 0); |
1da177e4 | 326 | |
294001a8 | 327 | memcpy(dasd_info->type, base->discipline->name, 4); |
554a826e | 328 | |
8e09f215 | 329 | if (block->request_queue->request_fn) { |
1da177e4 LT |
330 | struct list_head *l; |
331 | #ifdef DASD_EXTENDED_PROFILING | |
332 | { | |
333 | struct list_head *l; | |
8e09f215 SW |
334 | spin_lock_irqsave(&block->lock, flags); |
335 | list_for_each(l, &block->request_queue->queue_head) | |
1da177e4 | 336 | dasd_info->req_queue_len++; |
8e09f215 | 337 | spin_unlock_irqrestore(&block->lock, flags); |
1da177e4 LT |
338 | } |
339 | #endif /* DASD_EXTENDED_PROFILING */ | |
8e09f215 SW |
340 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
341 | list_for_each(l, &base->ccw_queue) | |
1da177e4 | 342 | dasd_info->chanq_len++; |
8e09f215 | 343 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
1da177e4 LT |
344 | flags); |
345 | } | |
346 | ||
347 | rc = 0; | |
13c6204f CH |
348 | if (copy_to_user(argp, dasd_info, |
349 | ((cmd == (unsigned int) BIODASDINFO2) ? | |
8e09f215 SW |
350 | sizeof(struct dasd_information2_t) : |
351 | sizeof(struct dasd_information_t)))) | |
1da177e4 LT |
352 | rc = -EFAULT; |
353 | kfree(dasd_info); | |
354 | return rc; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Set read only | |
359 | */ | |
360 | static int | |
13c6204f | 361 | dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) |
1da177e4 | 362 | { |
65f8da47 SW |
363 | struct dasd_device *base; |
364 | int intval, rc; | |
1da177e4 LT |
365 | |
366 | if (!capable(CAP_SYS_ADMIN)) | |
367 | return -EACCES; | |
368 | if (bdev != bdev->bd_contains) | |
369 | // ro setting is not allowed for partitions | |
370 | return -EINVAL; | |
d2c993d8 | 371 | if (get_user(intval, (int __user *)argp)) |
1da177e4 | 372 | return -EFAULT; |
65f8da47 SW |
373 | base = dasd_device_from_gendisk(bdev->bd_disk); |
374 | if (!base) | |
375 | return -ENODEV; | |
376 | if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) { | |
377 | dasd_put_device(base); | |
33b62a30 | 378 | return -EROFS; |
65f8da47 | 379 | } |
1da177e4 | 380 | set_disk_ro(bdev->bd_disk, intval); |
65f8da47 SW |
381 | rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval); |
382 | dasd_put_device(base); | |
383 | return rc; | |
1da177e4 LT |
384 | } |
385 | ||
8e09f215 | 386 | static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, |
88034865 | 387 | struct cmbdata __user *argp) |
8b2eb664 | 388 | { |
8b2eb664 CH |
389 | size_t size = _IOC_SIZE(cmd); |
390 | struct cmbdata data; | |
391 | int ret; | |
392 | ||
8e09f215 | 393 | ret = cmf_readall(block->base->cdev, &data); |
8b2eb664 CH |
394 | if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) |
395 | return -EFAULT; | |
396 | return ret; | |
397 | } | |
398 | ||
cfdb00a7 AB |
399 | int dasd_ioctl(struct block_device *bdev, fmode_t mode, |
400 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 401 | { |
65f8da47 SW |
402 | struct dasd_block *block; |
403 | struct dasd_device *base; | |
88034865 | 404 | void __user *argp; |
65f8da47 | 405 | int rc; |
88034865 HC |
406 | |
407 | if (is_compat_task()) | |
408 | argp = compat_ptr(arg); | |
409 | else | |
410 | argp = (void __user *)arg; | |
1da177e4 | 411 | |
13c6204f CH |
412 | if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { |
413 | PRINT_DEBUG("empty data ptr"); | |
414 | return -EINVAL; | |
415 | } | |
1da177e4 | 416 | |
65f8da47 SW |
417 | base = dasd_device_from_gendisk(bdev->bd_disk); |
418 | if (!base) | |
419 | return -ENODEV; | |
420 | block = base->block; | |
421 | rc = 0; | |
13c6204f CH |
422 | switch (cmd) { |
423 | case BIODASDDISABLE: | |
65f8da47 SW |
424 | rc = dasd_ioctl_disable(bdev); |
425 | break; | |
13c6204f | 426 | case BIODASDENABLE: |
65f8da47 SW |
427 | rc = dasd_ioctl_enable(bdev); |
428 | break; | |
13c6204f | 429 | case BIODASDQUIESCE: |
65f8da47 SW |
430 | rc = dasd_ioctl_quiesce(block); |
431 | break; | |
13c6204f | 432 | case BIODASDRESUME: |
65f8da47 SW |
433 | rc = dasd_ioctl_resume(block); |
434 | break; | |
13c6204f | 435 | case BIODASDFMT: |
65f8da47 SW |
436 | rc = dasd_ioctl_format(bdev, argp); |
437 | break; | |
13c6204f | 438 | case BIODASDINFO: |
65f8da47 SW |
439 | rc = dasd_ioctl_information(block, cmd, argp); |
440 | break; | |
13c6204f | 441 | case BIODASDINFO2: |
65f8da47 SW |
442 | rc = dasd_ioctl_information(block, cmd, argp); |
443 | break; | |
13c6204f | 444 | case BIODASDPRRD: |
65f8da47 SW |
445 | rc = dasd_ioctl_read_profile(block, argp); |
446 | break; | |
13c6204f | 447 | case BIODASDPRRST: |
65f8da47 SW |
448 | rc = dasd_ioctl_reset_profile(block); |
449 | break; | |
13c6204f | 450 | case BLKROSET: |
65f8da47 SW |
451 | rc = dasd_ioctl_set_ro(bdev, argp); |
452 | break; | |
13c6204f | 453 | case DASDAPIVER: |
65f8da47 SW |
454 | rc = dasd_ioctl_api_version(argp); |
455 | break; | |
8b2eb664 | 456 | case BIODASDCMFENABLE: |
65f8da47 SW |
457 | rc = enable_cmf(base->cdev); |
458 | break; | |
8b2eb664 | 459 | case BIODASDCMFDISABLE: |
65f8da47 SW |
460 | rc = disable_cmf(base->cdev); |
461 | break; | |
8b2eb664 | 462 | case BIODASDREADALLCMB: |
65f8da47 SW |
463 | rc = dasd_ioctl_readall_cmb(block, cmd, argp); |
464 | break; | |
13c6204f | 465 | default: |
1107ccfb | 466 | /* if the discipline has an ioctl method try it. */ |
65f8da47 SW |
467 | if (base->discipline->ioctl) { |
468 | rc = base->discipline->ioctl(block, cmd, argp); | |
469 | if (rc == -ENOIOCTLCMD) | |
470 | rc = -EINVAL; | |
471 | } else | |
472 | rc = -EINVAL; | |
13c6204f | 473 | } |
65f8da47 SW |
474 | dasd_put_device(base); |
475 | return rc; | |
1da177e4 | 476 | } |