Commit | Line | Data |
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151060ac TH |
1 | /* |
2 | * CUSE: Character device in Userspace | |
3 | * | |
4 | * Copyright (C) 2008-2009 SUSE Linux Products GmbH | |
5 | * Copyright (C) 2008-2009 Tejun Heo <tj@kernel.org> | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | * | |
9 | * CUSE enables character devices to be implemented from userland much | |
10 | * like FUSE allows filesystems. On initialization /dev/cuse is | |
11 | * created. By opening the file and replying to the CUSE_INIT request | |
12 | * userland CUSE server can create a character device. After that the | |
13 | * operation is very similar to FUSE. | |
14 | * | |
15 | * A CUSE instance involves the following objects. | |
16 | * | |
17 | * cuse_conn : contains fuse_conn and serves as bonding structure | |
18 | * channel : file handle connected to the userland CUSE server | |
19 | * cdev : the implemented character device | |
20 | * dev : generic device for cdev | |
21 | * | |
22 | * Note that 'channel' is what 'dev' is in FUSE. As CUSE deals with | |
23 | * devices, it's called 'channel' to reduce confusion. | |
24 | * | |
25 | * channel determines when the character device dies. When channel is | |
26 | * closed, everything begins to destruct. The cuse_conn is taken off | |
27 | * the lookup table preventing further access from cdev, cdev and | |
28 | * generic device are removed and the base reference of cuse_conn is | |
29 | * put. | |
30 | * | |
31 | * On each open, the matching cuse_conn is looked up and if found an | |
32 | * additional reference is taken which is released when the file is | |
33 | * closed. | |
34 | */ | |
35 | ||
36 | #include <linux/fuse.h> | |
37 | #include <linux/cdev.h> | |
38 | #include <linux/device.h> | |
39 | #include <linux/file.h> | |
40 | #include <linux/fs.h> | |
a27bb332 | 41 | #include <linux/aio.h> |
151060ac TH |
42 | #include <linux/kdev_t.h> |
43 | #include <linux/kthread.h> | |
44 | #include <linux/list.h> | |
45 | #include <linux/magic.h> | |
46 | #include <linux/miscdevice.h> | |
47 | #include <linux/mutex.h> | |
5a0e3ad6 | 48 | #include <linux/slab.h> |
151060ac | 49 | #include <linux/stat.h> |
143cb494 | 50 | #include <linux/module.h> |
151060ac TH |
51 | |
52 | #include "fuse_i.h" | |
53 | ||
54 | #define CUSE_CONNTBL_LEN 64 | |
55 | ||
56 | struct cuse_conn { | |
57 | struct list_head list; /* linked on cuse_conntbl */ | |
58 | struct fuse_conn fc; /* fuse connection */ | |
59 | struct cdev *cdev; /* associated character device */ | |
60 | struct device *dev; /* device representing @cdev */ | |
61 | ||
62 | /* init parameters, set once during initialization */ | |
63 | bool unrestricted_ioctl; | |
64 | }; | |
65 | ||
8ce03fd7 | 66 | static DEFINE_MUTEX(cuse_lock); /* protects registration */ |
151060ac TH |
67 | static struct list_head cuse_conntbl[CUSE_CONNTBL_LEN]; |
68 | static struct class *cuse_class; | |
69 | ||
70 | static struct cuse_conn *fc_to_cc(struct fuse_conn *fc) | |
71 | { | |
72 | return container_of(fc, struct cuse_conn, fc); | |
73 | } | |
74 | ||
75 | static struct list_head *cuse_conntbl_head(dev_t devt) | |
76 | { | |
77 | return &cuse_conntbl[(MAJOR(devt) + MINOR(devt)) % CUSE_CONNTBL_LEN]; | |
78 | } | |
79 | ||
80 | ||
81 | /************************************************************************** | |
82 | * CUSE frontend operations | |
83 | * | |
84 | * These are file operations for the character device. | |
85 | * | |
86 | * On open, CUSE opens a file from the FUSE mnt and stores it to | |
87 | * private_data of the open file. All other ops call FUSE ops on the | |
88 | * FUSE file. | |
89 | */ | |
90 | ||
91 | static ssize_t cuse_read(struct file *file, char __user *buf, size_t count, | |
92 | loff_t *ppos) | |
93 | { | |
94 | loff_t pos = 0; | |
fb05f41f | 95 | struct iovec iov = { .iov_base = buf, .iov_len = count }; |
36cf66ed | 96 | struct fuse_io_priv io = { .async = 0, .file = file }; |
d22a943f AV |
97 | struct iov_iter ii; |
98 | iov_iter_init(&ii, READ, &iov, 1, count); | |
151060ac | 99 | |
d22a943f | 100 | return fuse_direct_io(&io, &ii, &pos, FUSE_DIO_CUSE); |
151060ac TH |
101 | } |
102 | ||
103 | static ssize_t cuse_write(struct file *file, const char __user *buf, | |
104 | size_t count, loff_t *ppos) | |
105 | { | |
106 | loff_t pos = 0; | |
fb05f41f | 107 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count }; |
36cf66ed | 108 | struct fuse_io_priv io = { .async = 0, .file = file }; |
d22a943f AV |
109 | struct iov_iter ii; |
110 | iov_iter_init(&ii, WRITE, &iov, 1, count); | |
fb05f41f | 111 | |
151060ac TH |
112 | /* |
113 | * No locking or generic_write_checks(), the server is | |
114 | * responsible for locking and sanity checks. | |
115 | */ | |
d22a943f | 116 | return fuse_direct_io(&io, &ii, &pos, |
ea8cd333 | 117 | FUSE_DIO_WRITE | FUSE_DIO_CUSE); |
151060ac TH |
118 | } |
119 | ||
120 | static int cuse_open(struct inode *inode, struct file *file) | |
121 | { | |
122 | dev_t devt = inode->i_cdev->dev; | |
123 | struct cuse_conn *cc = NULL, *pos; | |
124 | int rc; | |
125 | ||
126 | /* look up and get the connection */ | |
8ce03fd7 | 127 | mutex_lock(&cuse_lock); |
151060ac TH |
128 | list_for_each_entry(pos, cuse_conntbl_head(devt), list) |
129 | if (pos->dev->devt == devt) { | |
130 | fuse_conn_get(&pos->fc); | |
131 | cc = pos; | |
132 | break; | |
133 | } | |
8ce03fd7 | 134 | mutex_unlock(&cuse_lock); |
151060ac TH |
135 | |
136 | /* dead? */ | |
137 | if (!cc) | |
138 | return -ENODEV; | |
139 | ||
140 | /* | |
141 | * Generic permission check is already done against the chrdev | |
142 | * file, proceed to open. | |
143 | */ | |
144 | rc = fuse_do_open(&cc->fc, 0, file, 0); | |
145 | if (rc) | |
146 | fuse_conn_put(&cc->fc); | |
147 | return rc; | |
148 | } | |
149 | ||
150 | static int cuse_release(struct inode *inode, struct file *file) | |
151 | { | |
152 | struct fuse_file *ff = file->private_data; | |
153 | struct fuse_conn *fc = ff->fc; | |
154 | ||
155 | fuse_sync_release(ff, file->f_flags); | |
156 | fuse_conn_put(fc); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static long cuse_file_ioctl(struct file *file, unsigned int cmd, | |
162 | unsigned long arg) | |
163 | { | |
164 | struct fuse_file *ff = file->private_data; | |
165 | struct cuse_conn *cc = fc_to_cc(ff->fc); | |
166 | unsigned int flags = 0; | |
167 | ||
168 | if (cc->unrestricted_ioctl) | |
169 | flags |= FUSE_IOCTL_UNRESTRICTED; | |
170 | ||
171 | return fuse_do_ioctl(file, cmd, arg, flags); | |
172 | } | |
173 | ||
174 | static long cuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
175 | unsigned long arg) | |
176 | { | |
177 | struct fuse_file *ff = file->private_data; | |
178 | struct cuse_conn *cc = fc_to_cc(ff->fc); | |
179 | unsigned int flags = FUSE_IOCTL_COMPAT; | |
180 | ||
181 | if (cc->unrestricted_ioctl) | |
182 | flags |= FUSE_IOCTL_UNRESTRICTED; | |
183 | ||
184 | return fuse_do_ioctl(file, cmd, arg, flags); | |
185 | } | |
186 | ||
187 | static const struct file_operations cuse_frontend_fops = { | |
188 | .owner = THIS_MODULE, | |
189 | .read = cuse_read, | |
190 | .write = cuse_write, | |
191 | .open = cuse_open, | |
192 | .release = cuse_release, | |
193 | .unlocked_ioctl = cuse_file_ioctl, | |
194 | .compat_ioctl = cuse_file_compat_ioctl, | |
195 | .poll = fuse_file_poll, | |
6038f373 | 196 | .llseek = noop_llseek, |
151060ac TH |
197 | }; |
198 | ||
199 | ||
200 | /************************************************************************** | |
201 | * CUSE channel initialization and destruction | |
202 | */ | |
203 | ||
204 | struct cuse_devinfo { | |
205 | const char *name; | |
206 | }; | |
207 | ||
208 | /** | |
209 | * cuse_parse_one - parse one key=value pair | |
210 | * @pp: i/o parameter for the current position | |
211 | * @end: points to one past the end of the packed string | |
212 | * @keyp: out parameter for key | |
213 | * @valp: out parameter for value | |
214 | * | |
215 | * *@pp points to packed strings - "key0=val0\0key1=val1\0" which ends | |
216 | * at @end - 1. This function parses one pair and set *@keyp to the | |
217 | * start of the key and *@valp to the start of the value. Note that | |
218 | * the original string is modified such that the key string is | |
219 | * terminated with '\0'. *@pp is updated to point to the next string. | |
220 | * | |
221 | * RETURNS: | |
222 | * 1 on successful parse, 0 on EOF, -errno on failure. | |
223 | */ | |
224 | static int cuse_parse_one(char **pp, char *end, char **keyp, char **valp) | |
225 | { | |
226 | char *p = *pp; | |
227 | char *key, *val; | |
228 | ||
229 | while (p < end && *p == '\0') | |
230 | p++; | |
231 | if (p == end) | |
232 | return 0; | |
233 | ||
234 | if (end[-1] != '\0') { | |
235 | printk(KERN_ERR "CUSE: info not properly terminated\n"); | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
239 | key = val = p; | |
240 | p += strlen(p); | |
241 | ||
242 | if (valp) { | |
243 | strsep(&val, "="); | |
244 | if (!val) | |
245 | val = key + strlen(key); | |
246 | key = strstrip(key); | |
247 | val = strstrip(val); | |
248 | } else | |
249 | key = strstrip(key); | |
250 | ||
251 | if (!strlen(key)) { | |
252 | printk(KERN_ERR "CUSE: zero length info key specified\n"); | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | *pp = p; | |
257 | *keyp = key; | |
258 | if (valp) | |
259 | *valp = val; | |
260 | ||
261 | return 1; | |
262 | } | |
263 | ||
264 | /** | |
265 | * cuse_parse_dev_info - parse device info | |
266 | * @p: device info string | |
267 | * @len: length of device info string | |
268 | * @devinfo: out parameter for parsed device info | |
269 | * | |
270 | * Parse @p to extract device info and store it into @devinfo. String | |
271 | * pointed to by @p is modified by parsing and @devinfo points into | |
272 | * them, so @p shouldn't be freed while @devinfo is in use. | |
273 | * | |
274 | * RETURNS: | |
275 | * 0 on success, -errno on failure. | |
276 | */ | |
277 | static int cuse_parse_devinfo(char *p, size_t len, struct cuse_devinfo *devinfo) | |
278 | { | |
279 | char *end = p + len; | |
e2560362 | 280 | char *uninitialized_var(key), *uninitialized_var(val); |
151060ac TH |
281 | int rc; |
282 | ||
283 | while (true) { | |
284 | rc = cuse_parse_one(&p, end, &key, &val); | |
285 | if (rc < 0) | |
286 | return rc; | |
287 | if (!rc) | |
288 | break; | |
289 | if (strcmp(key, "DEVNAME") == 0) | |
290 | devinfo->name = val; | |
291 | else | |
292 | printk(KERN_WARNING "CUSE: unknown device info \"%s\"\n", | |
293 | key); | |
294 | } | |
295 | ||
296 | if (!devinfo->name || !strlen(devinfo->name)) { | |
297 | printk(KERN_ERR "CUSE: DEVNAME unspecified\n"); | |
298 | return -EINVAL; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | static void cuse_gendev_release(struct device *dev) | |
305 | { | |
306 | kfree(dev); | |
307 | } | |
308 | ||
309 | /** | |
310 | * cuse_process_init_reply - finish initializing CUSE channel | |
311 | * | |
312 | * This function creates the character device and sets up all the | |
313 | * required data structures for it. Please read the comment at the | |
314 | * top of this file for high level overview. | |
315 | */ | |
316 | static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) | |
317 | { | |
30783587 | 318 | struct cuse_conn *cc = fc_to_cc(fc), *pos; |
07d5f69b | 319 | struct cuse_init_out *arg = req->out.args[0].value; |
151060ac TH |
320 | struct page *page = req->pages[0]; |
321 | struct cuse_devinfo devinfo = { }; | |
322 | struct device *dev; | |
323 | struct cdev *cdev; | |
324 | dev_t devt; | |
30783587 | 325 | int rc, i; |
151060ac TH |
326 | |
327 | if (req->out.h.error || | |
328 | arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) { | |
329 | goto err; | |
330 | } | |
331 | ||
332 | fc->minor = arg->minor; | |
333 | fc->max_read = max_t(unsigned, arg->max_read, 4096); | |
334 | fc->max_write = max_t(unsigned, arg->max_write, 4096); | |
335 | ||
336 | /* parse init reply */ | |
337 | cc->unrestricted_ioctl = arg->flags & CUSE_UNRESTRICTED_IOCTL; | |
338 | ||
339 | rc = cuse_parse_devinfo(page_address(page), req->out.args[1].size, | |
340 | &devinfo); | |
341 | if (rc) | |
342 | goto err; | |
343 | ||
344 | /* determine and reserve devt */ | |
345 | devt = MKDEV(arg->dev_major, arg->dev_minor); | |
346 | if (!MAJOR(devt)) | |
347 | rc = alloc_chrdev_region(&devt, MINOR(devt), 1, devinfo.name); | |
348 | else | |
349 | rc = register_chrdev_region(devt, 1, devinfo.name); | |
350 | if (rc) { | |
351 | printk(KERN_ERR "CUSE: failed to register chrdev region\n"); | |
352 | goto err; | |
353 | } | |
354 | ||
355 | /* devt determined, create device */ | |
356 | rc = -ENOMEM; | |
357 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
358 | if (!dev) | |
359 | goto err_region; | |
360 | ||
361 | device_initialize(dev); | |
362 | dev_set_uevent_suppress(dev, 1); | |
363 | dev->class = cuse_class; | |
364 | dev->devt = devt; | |
365 | dev->release = cuse_gendev_release; | |
366 | dev_set_drvdata(dev, cc); | |
367 | dev_set_name(dev, "%s", devinfo.name); | |
368 | ||
30783587 DH |
369 | mutex_lock(&cuse_lock); |
370 | ||
371 | /* make sure the device-name is unique */ | |
372 | for (i = 0; i < CUSE_CONNTBL_LEN; ++i) { | |
373 | list_for_each_entry(pos, &cuse_conntbl[i], list) | |
374 | if (!strcmp(dev_name(pos->dev), dev_name(dev))) | |
375 | goto err_unlock; | |
376 | } | |
377 | ||
151060ac TH |
378 | rc = device_add(dev); |
379 | if (rc) | |
30783587 | 380 | goto err_unlock; |
151060ac TH |
381 | |
382 | /* register cdev */ | |
383 | rc = -ENOMEM; | |
384 | cdev = cdev_alloc(); | |
385 | if (!cdev) | |
30783587 | 386 | goto err_unlock; |
151060ac TH |
387 | |
388 | cdev->owner = THIS_MODULE; | |
389 | cdev->ops = &cuse_frontend_fops; | |
390 | ||
391 | rc = cdev_add(cdev, devt, 1); | |
392 | if (rc) | |
393 | goto err_cdev; | |
394 | ||
395 | cc->dev = dev; | |
396 | cc->cdev = cdev; | |
397 | ||
398 | /* make the device available */ | |
151060ac | 399 | list_add(&cc->list, cuse_conntbl_head(devt)); |
8ce03fd7 | 400 | mutex_unlock(&cuse_lock); |
151060ac TH |
401 | |
402 | /* announce device availability */ | |
403 | dev_set_uevent_suppress(dev, 0); | |
404 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
405 | out: | |
07d5f69b | 406 | kfree(arg); |
151060ac TH |
407 | __free_page(page); |
408 | return; | |
409 | ||
410 | err_cdev: | |
411 | cdev_del(cdev); | |
30783587 DH |
412 | err_unlock: |
413 | mutex_unlock(&cuse_lock); | |
151060ac TH |
414 | put_device(dev); |
415 | err_region: | |
416 | unregister_chrdev_region(devt, 1); | |
417 | err: | |
580640ba | 418 | fuse_abort_conn(fc); |
151060ac TH |
419 | goto out; |
420 | } | |
421 | ||
422 | static int cuse_send_init(struct cuse_conn *cc) | |
423 | { | |
424 | int rc; | |
425 | struct fuse_req *req; | |
426 | struct page *page; | |
427 | struct fuse_conn *fc = &cc->fc; | |
428 | struct cuse_init_in *arg; | |
07d5f69b | 429 | void *outarg; |
151060ac TH |
430 | |
431 | BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE); | |
432 | ||
8b41e671 | 433 | req = fuse_get_req_for_background(fc, 1); |
151060ac TH |
434 | if (IS_ERR(req)) { |
435 | rc = PTR_ERR(req); | |
436 | goto err; | |
437 | } | |
438 | ||
439 | rc = -ENOMEM; | |
440 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
441 | if (!page) | |
442 | goto err_put_req; | |
443 | ||
07d5f69b MS |
444 | outarg = kzalloc(sizeof(struct cuse_init_out), GFP_KERNEL); |
445 | if (!outarg) | |
446 | goto err_free_page; | |
447 | ||
151060ac TH |
448 | arg = &req->misc.cuse_init_in; |
449 | arg->major = FUSE_KERNEL_VERSION; | |
450 | arg->minor = FUSE_KERNEL_MINOR_VERSION; | |
451 | arg->flags |= CUSE_UNRESTRICTED_IOCTL; | |
452 | req->in.h.opcode = CUSE_INIT; | |
453 | req->in.numargs = 1; | |
454 | req->in.args[0].size = sizeof(struct cuse_init_in); | |
455 | req->in.args[0].value = arg; | |
456 | req->out.numargs = 2; | |
457 | req->out.args[0].size = sizeof(struct cuse_init_out); | |
07d5f69b | 458 | req->out.args[0].value = outarg; |
151060ac TH |
459 | req->out.args[1].size = CUSE_INIT_INFO_MAX; |
460 | req->out.argvar = 1; | |
461 | req->out.argpages = 1; | |
462 | req->pages[0] = page; | |
85f40aec | 463 | req->page_descs[0].length = req->out.args[1].size; |
151060ac TH |
464 | req->num_pages = 1; |
465 | req->end = cuse_process_init_reply; | |
466 | fuse_request_send_background(fc, req); | |
467 | ||
468 | return 0; | |
469 | ||
07d5f69b MS |
470 | err_free_page: |
471 | __free_page(page); | |
151060ac TH |
472 | err_put_req: |
473 | fuse_put_request(fc, req); | |
474 | err: | |
475 | return rc; | |
476 | } | |
477 | ||
478 | static void cuse_fc_release(struct fuse_conn *fc) | |
479 | { | |
480 | struct cuse_conn *cc = fc_to_cc(fc); | |
dd3e2c55 | 481 | kfree_rcu(cc, fc.rcu); |
151060ac TH |
482 | } |
483 | ||
484 | /** | |
485 | * cuse_channel_open - open method for /dev/cuse | |
486 | * @inode: inode for /dev/cuse | |
487 | * @file: file struct being opened | |
488 | * | |
489 | * Userland CUSE server can create a CUSE device by opening /dev/cuse | |
8272f4c9 | 490 | * and replying to the initialization request kernel sends. This |
151060ac TH |
491 | * function is responsible for handling CUSE device initialization. |
492 | * Because the fd opened by this function is used during | |
493 | * initialization, this function only creates cuse_conn and sends | |
494 | * init. The rest is delegated to a kthread. | |
495 | * | |
496 | * RETURNS: | |
497 | * 0 on success, -errno on failure. | |
498 | */ | |
499 | static int cuse_channel_open(struct inode *inode, struct file *file) | |
500 | { | |
501 | struct cuse_conn *cc; | |
502 | int rc; | |
503 | ||
504 | /* set up cuse_conn */ | |
505 | cc = kzalloc(sizeof(*cc), GFP_KERNEL); | |
506 | if (!cc) | |
507 | return -ENOMEM; | |
508 | ||
509 | fuse_conn_init(&cc->fc); | |
510 | ||
511 | INIT_LIST_HEAD(&cc->list); | |
512 | cc->fc.release = cuse_fc_release; | |
513 | ||
514 | cc->fc.connected = 1; | |
796523fb | 515 | cc->fc.initialized = 1; |
151060ac TH |
516 | rc = cuse_send_init(cc); |
517 | if (rc) { | |
518 | fuse_conn_put(&cc->fc); | |
519 | return rc; | |
520 | } | |
521 | file->private_data = &cc->fc; /* channel owns base reference to cc */ | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | /** | |
527 | * cuse_channel_release - release method for /dev/cuse | |
528 | * @inode: inode for /dev/cuse | |
529 | * @file: file struct being closed | |
530 | * | |
531 | * Disconnect the channel, deregister CUSE device and initiate | |
532 | * destruction by putting the default reference. | |
533 | * | |
534 | * RETURNS: | |
535 | * 0 on success, -errno on failure. | |
536 | */ | |
537 | static int cuse_channel_release(struct inode *inode, struct file *file) | |
538 | { | |
539 | struct cuse_conn *cc = fc_to_cc(file->private_data); | |
540 | int rc; | |
541 | ||
542 | /* remove from the conntbl, no more access from this point on */ | |
8ce03fd7 | 543 | mutex_lock(&cuse_lock); |
151060ac | 544 | list_del_init(&cc->list); |
8ce03fd7 | 545 | mutex_unlock(&cuse_lock); |
151060ac TH |
546 | |
547 | /* remove device */ | |
548 | if (cc->dev) | |
549 | device_unregister(cc->dev); | |
550 | if (cc->cdev) { | |
551 | unregister_chrdev_region(cc->cdev->dev, 1); | |
552 | cdev_del(cc->cdev); | |
553 | } | |
554 | ||
151060ac TH |
555 | rc = fuse_dev_release(inode, file); /* puts the base reference */ |
556 | ||
557 | return rc; | |
558 | } | |
559 | ||
560 | static struct file_operations cuse_channel_fops; /* initialized during init */ | |
561 | ||
562 | ||
563 | /************************************************************************** | |
564 | * Misc stuff and module initializatiion | |
565 | * | |
566 | * CUSE exports the same set of attributes to sysfs as fusectl. | |
567 | */ | |
568 | ||
569 | static ssize_t cuse_class_waiting_show(struct device *dev, | |
570 | struct device_attribute *attr, char *buf) | |
571 | { | |
572 | struct cuse_conn *cc = dev_get_drvdata(dev); | |
573 | ||
574 | return sprintf(buf, "%d\n", atomic_read(&cc->fc.num_waiting)); | |
575 | } | |
58f86cc8 | 576 | static DEVICE_ATTR(waiting, 0400, cuse_class_waiting_show, NULL); |
151060ac TH |
577 | |
578 | static ssize_t cuse_class_abort_store(struct device *dev, | |
579 | struct device_attribute *attr, | |
580 | const char *buf, size_t count) | |
581 | { | |
582 | struct cuse_conn *cc = dev_get_drvdata(dev); | |
583 | ||
584 | fuse_abort_conn(&cc->fc); | |
585 | return count; | |
586 | } | |
58f86cc8 | 587 | static DEVICE_ATTR(abort, 0200, NULL, cuse_class_abort_store); |
151060ac | 588 | |
4183fb95 GKH |
589 | static struct attribute *cuse_class_dev_attrs[] = { |
590 | &dev_attr_waiting.attr, | |
591 | &dev_attr_abort.attr, | |
592 | NULL, | |
151060ac | 593 | }; |
4183fb95 | 594 | ATTRIBUTE_GROUPS(cuse_class_dev); |
151060ac TH |
595 | |
596 | static struct miscdevice cuse_miscdev = { | |
cb2ffb26 | 597 | .minor = CUSE_MINOR, |
151060ac TH |
598 | .name = "cuse", |
599 | .fops = &cuse_channel_fops, | |
600 | }; | |
601 | ||
cb2ffb26 TG |
602 | MODULE_ALIAS_MISCDEV(CUSE_MINOR); |
603 | MODULE_ALIAS("devname:cuse"); | |
604 | ||
151060ac TH |
605 | static int __init cuse_init(void) |
606 | { | |
607 | int i, rc; | |
608 | ||
609 | /* init conntbl */ | |
610 | for (i = 0; i < CUSE_CONNTBL_LEN; i++) | |
611 | INIT_LIST_HEAD(&cuse_conntbl[i]); | |
612 | ||
613 | /* inherit and extend fuse_dev_operations */ | |
614 | cuse_channel_fops = fuse_dev_operations; | |
615 | cuse_channel_fops.owner = THIS_MODULE; | |
616 | cuse_channel_fops.open = cuse_channel_open; | |
617 | cuse_channel_fops.release = cuse_channel_release; | |
618 | ||
619 | cuse_class = class_create(THIS_MODULE, "cuse"); | |
620 | if (IS_ERR(cuse_class)) | |
621 | return PTR_ERR(cuse_class); | |
622 | ||
4183fb95 | 623 | cuse_class->dev_groups = cuse_class_dev_groups; |
151060ac TH |
624 | |
625 | rc = misc_register(&cuse_miscdev); | |
626 | if (rc) { | |
627 | class_destroy(cuse_class); | |
628 | return rc; | |
629 | } | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
634 | static void __exit cuse_exit(void) | |
635 | { | |
636 | misc_deregister(&cuse_miscdev); | |
637 | class_destroy(cuse_class); | |
638 | } | |
639 | ||
640 | module_init(cuse_init); | |
641 | module_exit(cuse_exit); | |
642 | ||
643 | MODULE_AUTHOR("Tejun Heo <tj@kernel.org>"); | |
644 | MODULE_DESCRIPTION("Character device in Userspace"); | |
645 | MODULE_LICENSE("GPL"); |