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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> | |
405f5571 | 19 | #include <linux/smp_lock.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
88034865 | 21 | #include <asm/compat.h> |
1da177e4 | 22 | #include <asm/ccwdev.h> |
8b2eb664 | 23 | #include <asm/cmb.h> |
1da177e4 LT |
24 | #include <asm/uaccess.h> |
25 | ||
26 | /* This is ugly... */ | |
27 | #define PRINTK_HEADER "dasd_ioctl:" | |
28 | ||
29 | #include "dasd_int.h" | |
30 | ||
1da177e4 | 31 | |
1da177e4 | 32 | static int |
13c6204f | 33 | dasd_ioctl_api_version(void __user *argp) |
1da177e4 LT |
34 | { |
35 | int ver = DASD_API_VERSION; | |
b5029622 | 36 | return put_user(ver, (int __user *)argp); |
1da177e4 LT |
37 | } |
38 | ||
39 | /* | |
40 | * Enable device. | |
41 | * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection | |
42 | */ | |
43 | static int | |
13c6204f | 44 | dasd_ioctl_enable(struct block_device *bdev) |
1da177e4 | 45 | { |
8e09f215 | 46 | struct dasd_block *block = bdev->bd_disk->private_data; |
1da177e4 LT |
47 | |
48 | if (!capable(CAP_SYS_ADMIN)) | |
49 | return -EACCES; | |
13c6204f | 50 | |
8e09f215 | 51 | dasd_enable_device(block->base); |
1da177e4 | 52 | /* Formatting the dasd device can change the capacity. */ |
c039e313 | 53 | mutex_lock(&bdev->bd_mutex); |
8e09f215 | 54 | i_size_write(bdev->bd_inode, (loff_t)get_capacity(block->gdp) << 9); |
c039e313 | 55 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
56 | return 0; |
57 | } | |
58 | ||
59 | /* | |
60 | * Disable device. | |
61 | * Used by dasdfmt. Disable I/O operations but allow ioctls. | |
62 | */ | |
63 | static int | |
13c6204f | 64 | dasd_ioctl_disable(struct block_device *bdev) |
1da177e4 | 65 | { |
8e09f215 | 66 | struct dasd_block *block = bdev->bd_disk->private_data; |
1da177e4 LT |
67 | |
68 | if (!capable(CAP_SYS_ADMIN)) | |
69 | return -EACCES; | |
13c6204f | 70 | |
1da177e4 LT |
71 | /* |
72 | * Man this is sick. We don't do a real disable but only downgrade | |
73 | * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses | |
74 | * BIODASDDISABLE to disable accesses to the device via the block | |
75 | * device layer but it still wants to do i/o on the device by | |
76 | * using the BIODASDFMT ioctl. Therefore the correct state for the | |
77 | * device is DASD_STATE_BASIC that allows to do basic i/o. | |
78 | */ | |
8e09f215 | 79 | dasd_set_target_state(block->base, DASD_STATE_BASIC); |
1da177e4 LT |
80 | /* |
81 | * Set i_size to zero, since read, write, etc. check against this | |
82 | * value. | |
83 | */ | |
c039e313 | 84 | mutex_lock(&bdev->bd_mutex); |
1da177e4 | 85 | i_size_write(bdev->bd_inode, 0); |
c039e313 | 86 | mutex_unlock(&bdev->bd_mutex); |
1da177e4 LT |
87 | return 0; |
88 | } | |
89 | ||
90 | /* | |
91 | * Quiesce device. | |
92 | */ | |
8e09f215 | 93 | static int dasd_ioctl_quiesce(struct dasd_block *block) |
1da177e4 | 94 | { |
1da177e4 | 95 | unsigned long flags; |
8e09f215 | 96 | struct dasd_device *base; |
138c014d | 97 | |
8e09f215 | 98 | base = block->base; |
1da177e4 LT |
99 | if (!capable (CAP_SYS_ADMIN)) |
100 | return -EACCES; | |
138c014d | 101 | |
ca99dab0 SH |
102 | pr_info("%s: The DASD has been put in the quiesce " |
103 | "state\n", dev_name(&base->cdev->dev)); | |
8e09f215 | 104 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
eb6e199b | 105 | dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 | 106 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
1da177e4 LT |
107 | return 0; |
108 | } | |
109 | ||
110 | ||
111 | /* | |
fc19f381 | 112 | * Resume device. |
1da177e4 | 113 | */ |
8e09f215 | 114 | static int dasd_ioctl_resume(struct dasd_block *block) |
1da177e4 | 115 | { |
1da177e4 | 116 | unsigned long flags; |
8e09f215 | 117 | struct dasd_device *base; |
138c014d | 118 | |
8e09f215 | 119 | base = block->base; |
138c014d | 120 | if (!capable (CAP_SYS_ADMIN)) |
1da177e4 LT |
121 | return -EACCES; |
122 | ||
ca99dab0 SH |
123 | pr_info("%s: I/O operations have been resumed " |
124 | "on the DASD\n", dev_name(&base->cdev->dev)); | |
8e09f215 | 125 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
eb6e199b | 126 | dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE); |
8e09f215 | 127 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags); |
1da177e4 | 128 | |
8e09f215 | 129 | dasd_schedule_block_bh(block); |
1da177e4 LT |
130 | return 0; |
131 | } | |
132 | ||
133 | /* | |
134 | * performs formatting of _device_ according to _fdata_ | |
135 | * Note: The discipline's format_function is assumed to deliver formatting | |
136 | * commands to format a single unit of the device. In terms of the ECKD | |
137 | * devices this means CCWs are generated to format a single track. | |
138 | */ | |
8e09f215 | 139 | static int dasd_format(struct dasd_block *block, struct format_data_t *fdata) |
1da177e4 LT |
140 | { |
141 | struct dasd_ccw_req *cqr; | |
8e09f215 | 142 | struct dasd_device *base; |
1da177e4 LT |
143 | int rc; |
144 | ||
8e09f215 SW |
145 | base = block->base; |
146 | if (base->discipline->format_device == NULL) | |
1da177e4 LT |
147 | return -EPERM; |
148 | ||
8e09f215 | 149 | if (base->state != DASD_STATE_BASIC) { |
ca99dab0 SH |
150 | pr_warning("%s: The DASD cannot be formatted while it is " |
151 | "enabled\n", dev_name(&base->cdev->dev)); | |
1da177e4 LT |
152 | return -EBUSY; |
153 | } | |
154 | ||
8e09f215 | 155 | DBF_DEV_EVENT(DBF_NOTICE, base, |
b44b0ab3 | 156 | "formatting units %u to %u (%u B blocks) flags %u", |
1da177e4 LT |
157 | fdata->start_unit, |
158 | fdata->stop_unit, fdata->blksize, fdata->intensity); | |
159 | ||
160 | /* Since dasdfmt keeps the device open after it was disabled, | |
161 | * there still exists an inode for this device. | |
162 | * We must update i_blkbits, otherwise we might get errors when | |
163 | * enabling the device later. | |
164 | */ | |
165 | if (fdata->start_unit == 0) { | |
8e09f215 | 166 | struct block_device *bdev = bdget_disk(block->gdp, 0); |
1da177e4 LT |
167 | bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize); |
168 | bdput(bdev); | |
169 | } | |
170 | ||
171 | while (fdata->start_unit <= fdata->stop_unit) { | |
8e09f215 | 172 | cqr = base->discipline->format_device(base, fdata); |
1da177e4 LT |
173 | if (IS_ERR(cqr)) |
174 | return PTR_ERR(cqr); | |
175 | rc = dasd_sleep_on_interruptible(cqr); | |
8e09f215 | 176 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
177 | if (rc) { |
178 | if (rc != -ERESTARTSYS) | |
ca99dab0 SH |
179 | pr_err("%s: Formatting unit %d failed with " |
180 | "rc=%d\n", dev_name(&base->cdev->dev), | |
181 | fdata->start_unit, rc); | |
1da177e4 LT |
182 | return rc; |
183 | } | |
184 | fdata->start_unit++; | |
185 | } | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Format device. | |
191 | */ | |
192 | static int | |
13c6204f | 193 | dasd_ioctl_format(struct block_device *bdev, void __user *argp) |
1da177e4 | 194 | { |
8e09f215 | 195 | struct dasd_block *block = bdev->bd_disk->private_data; |
1da177e4 LT |
196 | struct format_data_t fdata; |
197 | ||
198 | if (!capable(CAP_SYS_ADMIN)) | |
199 | return -EACCES; | |
13c6204f | 200 | if (!argp) |
1da177e4 | 201 | return -EINVAL; |
f24acd45 | 202 | |
33b62a30 SW |
203 | if (block->base->features & DASD_FEATURE_READONLY || |
204 | test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags)) | |
1da177e4 | 205 | return -EROFS; |
13c6204f | 206 | if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) |
1da177e4 LT |
207 | return -EFAULT; |
208 | if (bdev != bdev->bd_contains) { | |
ca99dab0 SH |
209 | pr_warning("%s: The specified DASD is a partition and cannot " |
210 | "be formatted\n", | |
211 | dev_name(&block->base->cdev->dev)); | |
1da177e4 LT |
212 | return -EINVAL; |
213 | } | |
8e09f215 | 214 | return dasd_format(block, &fdata); |
1da177e4 LT |
215 | } |
216 | ||
217 | #ifdef CONFIG_DASD_PROFILE | |
218 | /* | |
219 | * Reset device profile information | |
220 | */ | |
8e09f215 | 221 | static int dasd_ioctl_reset_profile(struct dasd_block *block) |
1da177e4 | 222 | { |
8e09f215 | 223 | memset(&block->profile, 0, sizeof(struct dasd_profile_info_t)); |
1da177e4 LT |
224 | return 0; |
225 | } | |
226 | ||
227 | /* | |
228 | * Return device profile information | |
229 | */ | |
8e09f215 | 230 | static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
1da177e4 | 231 | { |
9a7af289 HH |
232 | if (dasd_profile_level == DASD_PROFILE_OFF) |
233 | return -EIO; | |
8e09f215 SW |
234 | if (copy_to_user(argp, &block->profile, |
235 | sizeof(struct dasd_profile_info_t))) | |
1da177e4 LT |
236 | return -EFAULT; |
237 | return 0; | |
238 | } | |
239 | #else | |
8e09f215 | 240 | static int dasd_ioctl_reset_profile(struct dasd_block *block) |
1da177e4 LT |
241 | { |
242 | return -ENOSYS; | |
243 | } | |
244 | ||
8e09f215 | 245 | static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp) |
1da177e4 LT |
246 | { |
247 | return -ENOSYS; | |
248 | } | |
249 | #endif | |
250 | ||
251 | /* | |
252 | * Return dasd information. Used for BIODASDINFO and BIODASDINFO2. | |
253 | */ | |
8e09f215 SW |
254 | static int dasd_ioctl_information(struct dasd_block *block, |
255 | unsigned int cmd, void __user *argp) | |
1da177e4 | 256 | { |
1da177e4 LT |
257 | struct dasd_information2_t *dasd_info; |
258 | unsigned long flags; | |
c6eb7b77 | 259 | int rc; |
8e09f215 | 260 | struct dasd_device *base; |
1da177e4 | 261 | struct ccw_device *cdev; |
9a92fe48 | 262 | struct ccw_dev_id dev_id; |
1da177e4 | 263 | |
8e09f215 | 264 | base = block->base; |
294001a8 | 265 | if (!base->discipline || !base->discipline->fill_info) |
1da177e4 LT |
266 | return -EINVAL; |
267 | ||
554a826e | 268 | dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL); |
1da177e4 LT |
269 | if (dasd_info == NULL) |
270 | return -ENOMEM; | |
271 | ||
8e09f215 | 272 | rc = base->discipline->fill_info(base, dasd_info); |
1da177e4 LT |
273 | if (rc) { |
274 | kfree(dasd_info); | |
275 | return rc; | |
276 | } | |
277 | ||
8e09f215 | 278 | cdev = base->cdev; |
9a92fe48 | 279 | ccw_device_get_id(cdev, &dev_id); |
1da177e4 | 280 | |
9a92fe48 | 281 | dasd_info->devno = dev_id.devno; |
8e09f215 | 282 | dasd_info->schid = _ccw_device_get_subchannel_number(base->cdev); |
1da177e4 LT |
283 | dasd_info->cu_type = cdev->id.cu_type; |
284 | dasd_info->cu_model = cdev->id.cu_model; | |
285 | dasd_info->dev_type = cdev->id.dev_type; | |
286 | dasd_info->dev_model = cdev->id.dev_model; | |
8e09f215 | 287 | dasd_info->status = base->state; |
57467195 HH |
288 | /* |
289 | * The open_count is increased for every opener, that includes | |
290 | * the blkdev_get in dasd_scan_partitions. | |
291 | * This must be hidden from user-space. | |
292 | */ | |
8e09f215 SW |
293 | dasd_info->open_count = atomic_read(&block->open_count); |
294 | if (!block->bdev) | |
57467195 | 295 | dasd_info->open_count++; |
138c014d | 296 | |
1da177e4 LT |
297 | /* |
298 | * check if device is really formatted | |
299 | * LDL / CDL was returned by 'fill_info' | |
300 | */ | |
8e09f215 SW |
301 | if ((base->state < DASD_STATE_READY) || |
302 | (dasd_check_blocksize(block->bp_block))) | |
1da177e4 | 303 | dasd_info->format = DASD_FORMAT_NONE; |
f24acd45 | 304 | |
c6eb7b77 | 305 | dasd_info->features |= |
8e09f215 | 306 | ((base->features & DASD_FEATURE_READONLY) != 0); |
1da177e4 | 307 | |
294001a8 | 308 | memcpy(dasd_info->type, base->discipline->name, 4); |
554a826e | 309 | |
8e09f215 | 310 | if (block->request_queue->request_fn) { |
1da177e4 LT |
311 | struct list_head *l; |
312 | #ifdef DASD_EXTENDED_PROFILING | |
313 | { | |
314 | struct list_head *l; | |
8e09f215 SW |
315 | spin_lock_irqsave(&block->lock, flags); |
316 | list_for_each(l, &block->request_queue->queue_head) | |
1da177e4 | 317 | dasd_info->req_queue_len++; |
8e09f215 | 318 | spin_unlock_irqrestore(&block->lock, flags); |
1da177e4 LT |
319 | } |
320 | #endif /* DASD_EXTENDED_PROFILING */ | |
8e09f215 SW |
321 | spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags); |
322 | list_for_each(l, &base->ccw_queue) | |
1da177e4 | 323 | dasd_info->chanq_len++; |
8e09f215 | 324 | spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), |
1da177e4 LT |
325 | flags); |
326 | } | |
327 | ||
328 | rc = 0; | |
13c6204f CH |
329 | if (copy_to_user(argp, dasd_info, |
330 | ((cmd == (unsigned int) BIODASDINFO2) ? | |
8e09f215 SW |
331 | sizeof(struct dasd_information2_t) : |
332 | sizeof(struct dasd_information_t)))) | |
1da177e4 LT |
333 | rc = -EFAULT; |
334 | kfree(dasd_info); | |
335 | return rc; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Set read only | |
340 | */ | |
341 | static int | |
13c6204f | 342 | dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp) |
1da177e4 | 343 | { |
8e09f215 | 344 | struct dasd_block *block = bdev->bd_disk->private_data; |
13c6204f | 345 | int intval; |
1da177e4 LT |
346 | |
347 | if (!capable(CAP_SYS_ADMIN)) | |
348 | return -EACCES; | |
349 | if (bdev != bdev->bd_contains) | |
350 | // ro setting is not allowed for partitions | |
351 | return -EINVAL; | |
d2c993d8 | 352 | if (get_user(intval, (int __user *)argp)) |
1da177e4 | 353 | return -EFAULT; |
33b62a30 SW |
354 | if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &block->base->flags)) |
355 | return -EROFS; | |
1da177e4 | 356 | set_disk_ro(bdev->bd_disk, intval); |
8e09f215 | 357 | return dasd_set_feature(block->base->cdev, DASD_FEATURE_READONLY, intval); |
1da177e4 LT |
358 | } |
359 | ||
8e09f215 | 360 | static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd, |
88034865 | 361 | struct cmbdata __user *argp) |
8b2eb664 | 362 | { |
8b2eb664 CH |
363 | size_t size = _IOC_SIZE(cmd); |
364 | struct cmbdata data; | |
365 | int ret; | |
366 | ||
8e09f215 | 367 | ret = cmf_readall(block->base->cdev, &data); |
8b2eb664 CH |
368 | if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp)))) |
369 | return -EFAULT; | |
370 | return ret; | |
371 | } | |
372 | ||
0000d031 HC |
373 | static int |
374 | dasd_do_ioctl(struct block_device *bdev, fmode_t mode, | |
375 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 376 | { |
8e09f215 | 377 | struct dasd_block *block = bdev->bd_disk->private_data; |
88034865 HC |
378 | void __user *argp; |
379 | ||
380 | if (is_compat_task()) | |
381 | argp = compat_ptr(arg); | |
382 | else | |
383 | argp = (void __user *)arg; | |
1da177e4 | 384 | |
8e09f215 | 385 | if (!block) |
13c6204f CH |
386 | return -ENODEV; |
387 | ||
388 | if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) { | |
389 | PRINT_DEBUG("empty data ptr"); | |
390 | return -EINVAL; | |
391 | } | |
1da177e4 | 392 | |
13c6204f CH |
393 | switch (cmd) { |
394 | case BIODASDDISABLE: | |
395 | return dasd_ioctl_disable(bdev); | |
396 | case BIODASDENABLE: | |
397 | return dasd_ioctl_enable(bdev); | |
398 | case BIODASDQUIESCE: | |
8e09f215 | 399 | return dasd_ioctl_quiesce(block); |
13c6204f | 400 | case BIODASDRESUME: |
8e09f215 | 401 | return dasd_ioctl_resume(block); |
13c6204f CH |
402 | case BIODASDFMT: |
403 | return dasd_ioctl_format(bdev, argp); | |
404 | case BIODASDINFO: | |
8e09f215 | 405 | return dasd_ioctl_information(block, cmd, argp); |
13c6204f | 406 | case BIODASDINFO2: |
8e09f215 | 407 | return dasd_ioctl_information(block, cmd, argp); |
13c6204f | 408 | case BIODASDPRRD: |
8e09f215 | 409 | return dasd_ioctl_read_profile(block, argp); |
13c6204f | 410 | case BIODASDPRRST: |
8e09f215 | 411 | return dasd_ioctl_reset_profile(block); |
13c6204f CH |
412 | case BLKROSET: |
413 | return dasd_ioctl_set_ro(bdev, argp); | |
414 | case DASDAPIVER: | |
415 | return dasd_ioctl_api_version(argp); | |
8b2eb664 | 416 | case BIODASDCMFENABLE: |
8e09f215 | 417 | return enable_cmf(block->base->cdev); |
8b2eb664 | 418 | case BIODASDCMFDISABLE: |
8e09f215 | 419 | return disable_cmf(block->base->cdev); |
8b2eb664 | 420 | case BIODASDREADALLCMB: |
88034865 | 421 | return dasd_ioctl_readall_cmb(block, cmd, argp); |
13c6204f | 422 | default: |
1107ccfb | 423 | /* if the discipline has an ioctl method try it. */ |
8e09f215 SW |
424 | if (block->base->discipline->ioctl) { |
425 | int rval = block->base->discipline->ioctl(block, cmd, argp); | |
1107ccfb CH |
426 | if (rval != -ENOIOCTLCMD) |
427 | return rval; | |
428 | } | |
429 | ||
13c6204f CH |
430 | return -EINVAL; |
431 | } | |
1da177e4 | 432 | } |
0000d031 HC |
433 | |
434 | int dasd_ioctl(struct block_device *bdev, fmode_t mode, | |
435 | unsigned int cmd, unsigned long arg) | |
436 | { | |
437 | int rc; | |
438 | ||
439 | lock_kernel(); | |
440 | rc = dasd_do_ioctl(bdev, mode, cmd, arg); | |
441 | unlock_kernel(); | |
442 | return rc; | |
443 | } |