1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
36 	/* Options that take integer arguments */
72 	int version = -EINVAL;  in get_cache_mode()
76 		p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");  in get_cache_mode()
79 		p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");  in get_cache_mode()
82 		p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");  in get_cache_mode()
85 		p9_debug(P9_DEBUG_9P, "Cache mode: readahead\n");  in get_cache_mode()
88 		p9_debug(P9_DEBUG_9P, "Cache mode: none\n");  in get_cache_mode()
90 		version = -EINVAL;  in get_cache_mode()
91 		pr_info("Unknown Cache mode or invalid value %s\n", s);  in get_cache_mode()
101 	struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;  in v9fs_show_options()
103 	if (v9ses->debug)  in v9fs_show_options()
104 		seq_printf(m, ",debug=%x", v9ses->debug);  in v9fs_show_options()
105 	if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID))  in v9fs_show_options()
107 			   from_kuid_munged(&init_user_ns, v9ses->dfltuid));  in v9fs_show_options()
108 	if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID))  in v9fs_show_options()
110 			   from_kgid_munged(&init_user_ns, v9ses->dfltgid));  in v9fs_show_options()
111 	if (v9ses->afid != ~0)  in v9fs_show_options()
112 		seq_printf(m, ",afid=%u", v9ses->afid);  in v9fs_show_options()
113 	if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0)  in v9fs_show_options()
114 		seq_printf(m, ",uname=%s", v9ses->uname);  in v9fs_show_options()
115 	if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0)  in v9fs_show_options()
116 		seq_printf(m, ",aname=%s", v9ses->aname);  in v9fs_show_options()
117 	if (v9ses->nodev)  in v9fs_show_options()
119 	if (v9ses->cache)  in v9fs_show_options()
120 		seq_printf(m, ",cache=%x", v9ses->cache);  in v9fs_show_options()
122 	if (v9ses->cachetag && (v9ses->cache & CACHE_FSCACHE))  in v9fs_show_options()
123 		seq_printf(m, ",cachetag=%s", v9ses->cachetag);  in v9fs_show_options()
126 	switch (v9ses->flags & V9FS_ACCESS_MASK) {  in v9fs_show_options()
138 			   from_kuid_munged(&init_user_ns, v9ses->uid));  in v9fs_show_options()
142 	if (v9ses->flags & V9FS_IGNORE_QV)  in v9fs_show_options()
144 	if (v9ses->flags & V9FS_DIRECT_IO)  in v9fs_show_options()
146 	if (v9ses->flags & V9FS_POSIX_ACL)  in v9fs_show_options()
149 	if (v9ses->flags & V9FS_NO_XATTR)  in v9fs_show_options()
152 	return p9_show_client_options(m, v9ses->clnt);  in v9fs_show_options()
156  * v9fs_parse_options - parse mount options into session structure
160  * Return 0 upon success, -ERRNO upon failure.
173 	v9ses->afid = ~0;  in v9fs_parse_options()
174 	v9ses->debug = 0;  in v9fs_parse_options()
175 	v9ses->cache = CACHE_NONE;  in v9fs_parse_options()
177 	v9ses->cachetag = NULL;  in v9fs_parse_options()
179 	v9ses->session_lock_timeout = P9_LOCK_TIMEOUT;  in v9fs_parse_options()
186 		ret = -ENOMEM;  in v9fs_parse_options()
203 					 "integer field, but no integer?\n");  in v9fs_parse_options()
206 				v9ses->debug = option;  in v9fs_parse_options()
217 					 "integer field, but no integer?\n");  in v9fs_parse_options()
221 			v9ses->dfltuid = make_kuid(current_user_ns(), option);  in v9fs_parse_options()
222 			if (!uid_valid(v9ses->dfltuid)) {  in v9fs_parse_options()
224 					 "uid field, but not a uid?\n");  in v9fs_parse_options()
225 				ret = -EINVAL;  in v9fs_parse_options()
232 					 "integer field, but no integer?\n");  in v9fs_parse_options()
236 			v9ses->dfltgid = make_kgid(current_user_ns(), option);  in v9fs_parse_options()
237 			if (!gid_valid(v9ses->dfltgid)) {  in v9fs_parse_options()
239 					 "gid field, but not a gid?\n");  in v9fs_parse_options()
240 				ret = -EINVAL;  in v9fs_parse_options()
247 					 "integer field, but no integer?\n");  in v9fs_parse_options()
250 				v9ses->afid = option;  in v9fs_parse_options()
254 			kfree(v9ses->uname);  in v9fs_parse_options()
255 			v9ses->uname = match_strdup(&args[0]);  in v9fs_parse_options()
256 			if (!v9ses->uname) {  in v9fs_parse_options()
257 				ret = -ENOMEM;  in v9fs_parse_options()
262 			kfree(v9ses->aname);  in v9fs_parse_options()
263 			v9ses->aname = match_strdup(&args[0]);  in v9fs_parse_options()
264 			if (!v9ses->aname) {  in v9fs_parse_options()
265 				ret = -ENOMEM;  in v9fs_parse_options()
270 			v9ses->nodev = 1;  in v9fs_parse_options()
273 			v9ses->flags |= V9FS_NO_XATTR;  in v9fs_parse_options()
276 			v9ses->flags |= V9FS_DIRECT_IO;  in v9fs_parse_options()
279 			v9ses->flags |= V9FS_IGNORE_QV;  in v9fs_parse_options()
283 			kfree(v9ses->cachetag);  in v9fs_parse_options()
284 			v9ses->cachetag = match_strdup(&args[0]);  in v9fs_parse_options()
285 			if (!v9ses->cachetag) {  in v9fs_parse_options()
286 				ret = -ENOMEM;  in v9fs_parse_options()
294 				ret = -ENOMEM;  in v9fs_parse_options()
296 					 "problem allocating copy of cache arg\n");  in v9fs_parse_options()
303 				v9ses->cache = r;  in v9fs_parse_options()
311 				ret = -ENOMEM;  in v9fs_parse_options()
313 					 "problem allocating copy of access arg\n");  in v9fs_parse_options()
317 			v9ses->flags &= ~V9FS_ACCESS_MASK;  in v9fs_parse_options()
319 				v9ses->flags |= V9FS_ACCESS_USER;  in v9fs_parse_options()
321 				v9ses->flags |= V9FS_ACCESS_ANY;  in v9fs_parse_options()
323 				v9ses->flags |= V9FS_ACCESS_CLIENT;  in v9fs_parse_options()
327 				v9ses->flags |= V9FS_ACCESS_SINGLE;  in v9fs_parse_options()
331 					pr_info("Unknown access argument %s: %d\n",  in v9fs_parse_options()
336 				v9ses->uid = make_kuid(current_user_ns(), uid);  in v9fs_parse_options()
337 				if (!uid_valid(v9ses->uid)) {  in v9fs_parse_options()
338 					ret = -EINVAL;  in v9fs_parse_options()
339 					pr_info("Unknown uid %s\n", s);  in v9fs_parse_options()
348 			v9ses->flags |= V9FS_POSIX_ACL;  in v9fs_parse_options()
351 				 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");  in v9fs_parse_options()
359 					 "integer field, but no integer?\n");  in v9fs_parse_options()
365 					 "locktimeout must be a greater than zero integer.\n");  in v9fs_parse_options()
366 				ret = -EINVAL;  in v9fs_parse_options()
369 			v9ses->session_lock_timeout = (long)option * HZ;  in v9fs_parse_options()
384  * v9fs_session_init - initialize session
395 	int rc = -ENOMEM;  in v9fs_session_init()
397 	v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);  in v9fs_session_init()
398 	if (!v9ses->uname)  in v9fs_session_init()
401 	v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);  in v9fs_session_init()
402 	if (!v9ses->aname)  in v9fs_session_init()
404 	init_rwsem(&v9ses->rename_sem);  in v9fs_session_init()
406 	v9ses->uid = INVALID_UID;  in v9fs_session_init()
407 	v9ses->dfltuid = V9FS_DEFUID;  in v9fs_session_init()
408 	v9ses->dfltgid = V9FS_DEFGID;  in v9fs_session_init()
410 	v9ses->clnt = p9_client_create(dev_name, data);  in v9fs_session_init()
411 	if (IS_ERR(v9ses->clnt)) {  in v9fs_session_init()
412 		rc = PTR_ERR(v9ses->clnt);  in v9fs_session_init()
413 		p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");  in v9fs_session_init()
417 	v9ses->flags = V9FS_ACCESS_USER;  in v9fs_session_init()
419 	if (p9_is_proto_dotl(v9ses->clnt)) {  in v9fs_session_init()
420 		v9ses->flags = V9FS_ACCESS_CLIENT;  in v9fs_session_init()
421 		v9ses->flags |= V9FS_PROTO_2000L;  in v9fs_session_init()
422 	} else if (p9_is_proto_dotu(v9ses->clnt)) {  in v9fs_session_init()
423 		v9ses->flags |= V9FS_PROTO_2000U;  in v9fs_session_init()
430 	v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;  in v9fs_session_init()
433 	    ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {  in v9fs_session_init()
438 		v9ses->flags &= ~V9FS_ACCESS_MASK;  in v9fs_session_init()
439 		v9ses->flags |= V9FS_ACCESS_USER;  in v9fs_session_init()
444 		((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {  in v9fs_session_init()
446 		v9ses->flags &= ~V9FS_ACCESS_MASK;  in v9fs_session_init()
447 		v9ses->flags |= V9FS_ACCESS_ANY;  in v9fs_session_init()
448 		v9ses->uid = INVALID_UID;  in v9fs_session_init()
451 		!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {  in v9fs_session_init()
456 		v9ses->flags &= ~V9FS_ACL_MASK;  in v9fs_session_init()
459 	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,  in v9fs_session_init()
460 							v9ses->aname);  in v9fs_session_init()
463 		p9_debug(P9_DEBUG_ERROR, "cannot attach\n");  in v9fs_session_init()
467 	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)  in v9fs_session_init()
468 		fid->uid = v9ses->uid;  in v9fs_session_init()
470 		fid->uid = INVALID_UID;  in v9fs_session_init()
474 	if (v9ses->cache & CACHE_FSCACHE) {  in v9fs_session_init()
481 	list_add(&v9ses->slist, &v9fs_sessionlist);  in v9fs_session_init()
488 	kfree(v9ses->cachetag);  in v9fs_session_init()
490 	p9_client_destroy(v9ses->clnt);  in v9fs_session_init()
492 	kfree(v9ses->uname);  in v9fs_session_init()
493 	kfree(v9ses->aname);  in v9fs_session_init()
498  * v9fs_session_close - shutdown a session
505 	if (v9ses->clnt) {  in v9fs_session_close()
506 		p9_client_destroy(v9ses->clnt);  in v9fs_session_close()
507 		v9ses->clnt = NULL;  in v9fs_session_close()
512 	kfree(v9ses->cachetag);  in v9fs_session_close()
514 	kfree(v9ses->uname);  in v9fs_session_close()
515 	kfree(v9ses->aname);  in v9fs_session_close()
518 	list_del(&v9ses->slist);  in v9fs_session_close()
523  * v9fs_session_cancel - terminate a session
531 	p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);  in v9fs_session_cancel()
532 	p9_client_disconnect(v9ses->clnt);  in v9fs_session_cancel()
536  * v9fs_session_begin_cancel - Begin terminate of a session
544 	p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);  in v9fs_session_begin_cancel()
545 	p9_client_begin_disconnect(v9ses->clnt);  in v9fs_session_begin_cancel()
558 	ssize_t n = 0, count = 0, limit = PAGE_SIZE;  in caches_show()  local
563 		if (v9ses->cachetag) {  in caches_show()
564 			n = snprintf(buf, limit, "%s\n", v9ses->cachetag);  in caches_show()
565 			if (n < 0) {  in caches_show()
566 				count = n;  in caches_show()
570 			count += n;  in caches_show()
571 			limit -= n;  in caches_show()
594  * v9fs_sysfs_init - Initialize the v9fs sysfs interface
602 		return -ENOMEM;  in v9fs_sysfs_init()
606 		return -ENOMEM;  in v9fs_sysfs_init()
613  * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
627 	memset(&v9inode->qid, 0, sizeof(v9inode->qid));  in v9fs_inode_init_once()
628 	inode_init_once(&v9inode->netfs.inode);  in v9fs_inode_init_once()
632  * v9fs_init_inode_cache - initialize a cache for 9P
643 		return -ENOMEM;  in v9fs_init_inode_cache()
649  * v9fs_destroy_inode_cache - destroy the cache of 9P inode
678  * init_v9fs - Initialize module
686 	pr_info("Installing v9fs 9p2000 file system support\n");  in init_v9fs()
691 		pr_err("Failed to register v9fs for caching\n");  in init_v9fs()
697 		pr_err("Failed to register with sysfs\n");  in init_v9fs()
702 		pr_err("Failed to register filesystem\n");  in init_v9fs()
718  * exit_v9fs - shutdown module