1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2008-2009  SUSE Linux Products GmbH
6  * Copyright (C) 2008-2009  Tejun Heo <tj@kernel.org>
116 	dev_t devt = inode->i_cdev->dev;  in cuse_open()
123 		if (pos->dev->devt == devt) {  in cuse_open()
124 			fuse_conn_get(&pos->fc);  in cuse_open()
132 		return -ENODEV;  in cuse_open()
138 	rc = fuse_do_open(&cc->fm, 0, file, 0);  in cuse_open()
140 		fuse_conn_put(&cc->fc);  in cuse_open()
146 	struct fuse_file *ff = file->private_data;  in cuse_release()
147 	struct fuse_mount *fm = ff->fm;  in cuse_release()
149 	fuse_sync_release(NULL, ff, file->f_flags);  in cuse_release()
150 	fuse_conn_put(fm->fc);  in cuse_release()
158 	struct fuse_file *ff = file->private_data;  in cuse_file_ioctl()
159 	struct cuse_conn *cc = fc_to_cc(ff->fm->fc);  in cuse_file_ioctl()
162 	if (cc->unrestricted_ioctl)  in cuse_file_ioctl()
171 	struct fuse_file *ff = file->private_data;  in cuse_file_compat_ioctl()
172 	struct cuse_conn *cc = fc_to_cc(ff->fm->fc);  in cuse_file_compat_ioctl()
175 	if (cc->unrestricted_ioctl)  in cuse_file_compat_ioctl()
186 	.release		= cuse_release,
203  * cuse_parse_one - parse one key=value pair
206  * @keyp: out parameter for key
209  * *@pp points to packed strings - "key0=val0\0key1=val1\0" which ends
210  * at @end - 1.  This function parses one pair and set *@keyp to the
211  * start of the key and *@valp to the start of the value.  Note that
212  * the original string is modified such that the key string is
216  * 1 on successful parse, 0 on EOF, -errno on failure.
221 	char *key, *val;  in cuse_parse_one()  local
228 	if (end[-1] != '\0') {  in cuse_parse_one()
230 		return -EINVAL;  in cuse_parse_one()
233 	key = val = p;  in cuse_parse_one()
239 			val = key + strlen(key);  in cuse_parse_one()
240 		key = strstrip(key);  in cuse_parse_one()
243 		key = strstrip(key);  in cuse_parse_one()
245 	if (!strlen(key)) {  in cuse_parse_one()
246 		pr_err("zero length info key specified\n");  in cuse_parse_one()
247 		return -EINVAL;  in cuse_parse_one()
251 	*keyp = key;  in cuse_parse_one()
259  * cuse_parse_devinfo - parse device info
269  * 0 on success, -errno on failure.
274 	char *key, *val;  in cuse_parse_devinfo()  local
278 		rc = cuse_parse_one(&p, end, &key, &val);  in cuse_parse_devinfo()
283 		if (strcmp(key, "DEVNAME") == 0)  in cuse_parse_devinfo()
284 			devinfo->name = val;  in cuse_parse_devinfo()
286 			pr_warn("unknown device info \"%s\"\n", key);  in cuse_parse_devinfo()
289 	if (!devinfo->name || !strlen(devinfo->name)) {  in cuse_parse_devinfo()
291 		return -EINVAL;  in cuse_parse_devinfo()
311  * cuse_process_init_reply - finish initializing CUSE channel
320 	struct fuse_conn *fc = fm->fc;  in cuse_process_init_reply()
322 	struct fuse_args_pages *ap = &ia->ap;  in cuse_process_init_reply()
324 	struct cuse_init_out *arg = &ia->out;  in cuse_process_init_reply()
325 	struct page *page = ap->pages[0];  in cuse_process_init_reply()
332 	if (error || arg->major != FUSE_KERNEL_VERSION || arg->minor < 11)  in cuse_process_init_reply()
335 	fc->minor = arg->minor;  in cuse_process_init_reply()
336 	fc->max_read = max_t(unsigned, arg->max_read, 4096);  in cuse_process_init_reply()
337 	fc->max_write = max_t(unsigned, arg->max_write, 4096);  in cuse_process_init_reply()
340 	cc->unrestricted_ioctl = arg->flags & CUSE_UNRESTRICTED_IOCTL;  in cuse_process_init_reply()
342 	rc = cuse_parse_devinfo(page_address(page), ap->args.out_args[1].size,  in cuse_process_init_reply()
348 	devt = MKDEV(arg->dev_major, arg->dev_minor);  in cuse_process_init_reply()
359 	rc = -ENOMEM;  in cuse_process_init_reply()
366 	dev->class = cuse_class;  in cuse_process_init_reply()
367 	dev->devt = devt;  in cuse_process_init_reply()
368 	dev->release = cuse_gendev_release;  in cuse_process_init_reply()
374 	/* make sure the device-name is unique */  in cuse_process_init_reply()
377 			if (!strcmp(dev_name(pos->dev), dev_name(dev)))  in cuse_process_init_reply()
386 	rc = -ENOMEM;  in cuse_process_init_reply()
391 	cdev->owner = THIS_MODULE;  in cuse_process_init_reply()
392 	cdev->ops = &cuse_frontend_fops;  in cuse_process_init_reply()
398 	cc->dev = dev;  in cuse_process_init_reply()
399 	cc->cdev = cdev;  in cuse_process_init_reply()
402 	list_add(&cc->list, cuse_conntbl_head(devt));  in cuse_process_init_reply()
407 	kobject_uevent(&dev->kobj, KOBJ_ADD);  in cuse_process_init_reply()
429 	struct fuse_mount *fm = &cc->fm;  in cuse_send_init()
435 	rc = -ENOMEM;  in cuse_send_init()
444 	ap = &ia->ap;  in cuse_send_init()
445 	ia->in.major = FUSE_KERNEL_VERSION;  in cuse_send_init()
446 	ia->in.minor = FUSE_KERNEL_MINOR_VERSION;  in cuse_send_init()
447 	ia->in.flags |= CUSE_UNRESTRICTED_IOCTL;  in cuse_send_init()
448 	ap->args.opcode = CUSE_INIT;  in cuse_send_init()
449 	ap->args.in_numargs = 1;  in cuse_send_init()
450 	ap->args.in_args[0].size = sizeof(ia->in);  in cuse_send_init()
451 	ap->args.in_args[0].value = &ia->in;  in cuse_send_init()
452 	ap->args.out_numargs = 2;  in cuse_send_init()
453 	ap->args.out_args[0].size = sizeof(ia->out);  in cuse_send_init()
454 	ap->args.out_args[0].value = &ia->out;  in cuse_send_init()
455 	ap->args.out_args[1].size = CUSE_INIT_INFO_MAX;  in cuse_send_init()
456 	ap->args.out_argvar = true;  in cuse_send_init()
457 	ap->args.out_pages = true;  in cuse_send_init()
458 	ap->num_pages = 1;  in cuse_send_init()
459 	ap->pages = &ia->page;  in cuse_send_init()
460 	ap->descs = &ia->desc;  in cuse_send_init()
461 	ia->page = page;  in cuse_send_init()
462 	ia->desc.length = ap->args.out_args[1].size;  in cuse_send_init()
463 	ap->args.end = cuse_process_init_reply;  in cuse_send_init()
465 	rc = fuse_simple_background(fm, &ap->args, GFP_KERNEL);  in cuse_send_init()
482  * cuse_channel_open - open method for /dev/cuse
494  * 0 on success, -errno on failure.
505 		return -ENOMEM;  in cuse_channel_open()
509 	 * be represented in file->f_cred->user_ns.  in cuse_channel_open()
511 	fuse_conn_init(&cc->fc, &cc->fm, file->f_cred->user_ns,  in cuse_channel_open()
514 	cc->fc.release = cuse_fc_release;  in cuse_channel_open()
515 	fud = fuse_dev_alloc_install(&cc->fc);  in cuse_channel_open()
516 	fuse_conn_put(&cc->fc);  in cuse_channel_open()
518 		return -ENOMEM;  in cuse_channel_open()
520 	INIT_LIST_HEAD(&cc->list);  in cuse_channel_open()
522 	cc->fc.initialized = 1;  in cuse_channel_open()
528 	file->private_data = fud;  in cuse_channel_open()
534  * cuse_channel_release - release method for /dev/cuse
542  * 0 on success, -errno on failure.
546 	struct fuse_dev *fud = file->private_data;  in cuse_channel_release()
547 	struct cuse_conn *cc = fc_to_cc(fud->fc);  in cuse_channel_release()
551 	list_del_init(&cc->list);  in cuse_channel_release()
555 	if (cc->dev)  in cuse_channel_release()
556 		device_unregister(cc->dev);  in cuse_channel_release()
557 	if (cc->cdev) {  in cuse_channel_release()
558 		unregister_chrdev_region(cc->cdev->dev, 1);  in cuse_channel_release()
559 		cdev_del(cc->cdev);  in cuse_channel_release()
579 	return sprintf(buf, "%d\n", atomic_read(&cc->fc.num_waiting));  in cuse_class_waiting_show()
589 	fuse_abort_conn(&cc->fc);  in cuse_class_abort_store()
622 	cuse_channel_fops.release	= cuse_channel_release;  in cuse_init()
630 	cuse_class->dev_groups = cuse_class_dev_groups;  in cuse_init()