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9
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/fs.h>
16#include <linux/sched.h>
17#include <linux/cred.h>
18#include <linux/parser.h>
19#include <linux/idr.h>
20#include <linux/slab.h>
21#include <linux/seq_file.h>
22#include <net/9p/9p.h>
23#include <net/9p/client.h>
24#include <net/9p/transport.h>
25#include "v9fs.h"
26#include "v9fs_vfs.h"
27#include "cache.h"
28
29static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
30static LIST_HEAD(v9fs_sessionlist);
31struct kmem_cache *v9fs_inode_cache;
32
33
34
35
36
37
38enum {
39
40 Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
41
42 Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
43
44 Opt_nodevmap,
45
46 Opt_cache_loose, Opt_fscache, Opt_mmap,
47
48 Opt_access, Opt_posixacl,
49
50 Opt_locktimeout,
51
52 Opt_err
53};
54
55static const match_table_t tokens = {
56 {Opt_debug, "debug=%x"},
57 {Opt_dfltuid, "dfltuid=%u"},
58 {Opt_dfltgid, "dfltgid=%u"},
59 {Opt_afid, "afid=%u"},
60 {Opt_uname, "uname=%s"},
61 {Opt_remotename, "aname=%s"},
62 {Opt_nodevmap, "nodevmap"},
63 {Opt_cache, "cache=%s"},
64 {Opt_cache_loose, "loose"},
65 {Opt_fscache, "fscache"},
66 {Opt_mmap, "mmap"},
67 {Opt_cachetag, "cachetag=%s"},
68 {Opt_access, "access=%s"},
69 {Opt_posixacl, "posixacl"},
70 {Opt_locktimeout, "locktimeout=%u"},
71 {Opt_err, NULL}
72};
73
74static const char *const v9fs_cache_modes[nr__p9_cache_modes] = {
75 [CACHE_NONE] = "none",
76 [CACHE_MMAP] = "mmap",
77 [CACHE_LOOSE] = "loose",
78 [CACHE_FSCACHE] = "fscache",
79};
80
81
82static int get_cache_mode(char *s)
83{
84 int version = -EINVAL;
85
86 if (!strcmp(s, "loose")) {
87 version = CACHE_LOOSE;
88 p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
89 } else if (!strcmp(s, "fscache")) {
90 version = CACHE_FSCACHE;
91 p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
92 } else if (!strcmp(s, "mmap")) {
93 version = CACHE_MMAP;
94 p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
95 } else if (!strcmp(s, "none")) {
96 version = CACHE_NONE;
97 p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
98 } else
99 pr_info("Unknown Cache mode %s\n", s);
100 return version;
101}
102
103
104
105
106int v9fs_show_options(struct seq_file *m, struct dentry *root)
107{
108 struct v9fs_session_info *v9ses = root->d_sb->s_fs_info;
109
110 if (v9ses->debug)
111 seq_printf(m, ",debug=%x", v9ses->debug);
112 if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID))
113 seq_printf(m, ",dfltuid=%u",
114 from_kuid_munged(&init_user_ns, v9ses->dfltuid));
115 if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID))
116 seq_printf(m, ",dfltgid=%u",
117 from_kgid_munged(&init_user_ns, v9ses->dfltgid));
118 if (v9ses->afid != ~0)
119 seq_printf(m, ",afid=%u", v9ses->afid);
120 if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0)
121 seq_printf(m, ",uname=%s", v9ses->uname);
122 if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0)
123 seq_printf(m, ",aname=%s", v9ses->aname);
124 if (v9ses->nodev)
125 seq_puts(m, ",nodevmap");
126 if (v9ses->cache)
127 seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]);
128#ifdef CONFIG_9P_FSCACHE
129 if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE)
130 seq_printf(m, ",cachetag=%s", v9ses->cachetag);
131#endif
132
133 switch (v9ses->flags & V9FS_ACCESS_MASK) {
134 case V9FS_ACCESS_USER:
135 seq_puts(m, ",access=user");
136 break;
137 case V9FS_ACCESS_ANY:
138 seq_puts(m, ",access=any");
139 break;
140 case V9FS_ACCESS_CLIENT:
141 seq_puts(m, ",access=client");
142 break;
143 case V9FS_ACCESS_SINGLE:
144 seq_printf(m, ",access=%u",
145 from_kuid_munged(&init_user_ns, v9ses->uid));
146 break;
147 }
148
149 if (v9ses->flags & V9FS_POSIX_ACL)
150 seq_puts(m, ",posixacl");
151
152 return p9_show_client_options(m, v9ses->clnt);
153}
154
155
156
157
158
159
160
161
162static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
163{
164 char *options, *tmp_options;
165 substring_t args[MAX_OPT_ARGS];
166 char *p;
167 int option = 0;
168 char *s, *e;
169 int ret = 0;
170
171
172 v9ses->afid = ~0;
173 v9ses->debug = 0;
174 v9ses->cache = CACHE_NONE;
175#ifdef CONFIG_9P_FSCACHE
176 v9ses->cachetag = NULL;
177#endif
178 v9ses->session_lock_timeout = P9_LOCK_TIMEOUT;
179
180 if (!opts)
181 return 0;
182
183 tmp_options = kstrdup(opts, GFP_KERNEL);
184 if (!tmp_options) {
185 ret = -ENOMEM;
186 goto fail_option_alloc;
187 }
188 options = tmp_options;
189
190 while ((p = strsep(&options, ",")) != NULL) {
191 int token, r;
192 if (!*p)
193 continue;
194 token = match_token(p, tokens, args);
195 switch (token) {
196 case Opt_debug:
197 r = match_int(&args[0], &option);
198 if (r < 0) {
199 p9_debug(P9_DEBUG_ERROR,
200 "integer field, but no integer?\n");
201 ret = r;
202 } else {
203 v9ses->debug = option;
204#ifdef CONFIG_NET_9P_DEBUG
205 p9_debug_level = option;
206#endif
207 }
208 break;
209
210 case Opt_dfltuid:
211 r = match_int(&args[0], &option);
212 if (r < 0) {
213 p9_debug(P9_DEBUG_ERROR,
214 "integer field, but no integer?\n");
215 ret = r;
216 continue;
217 }
218 v9ses->dfltuid = make_kuid(current_user_ns(), option);
219 if (!uid_valid(v9ses->dfltuid)) {
220 p9_debug(P9_DEBUG_ERROR,
221 "uid field, but not a uid?\n");
222 ret = -EINVAL;
223 }
224 break;
225 case Opt_dfltgid:
226 r = match_int(&args[0], &option);
227 if (r < 0) {
228 p9_debug(P9_DEBUG_ERROR,
229 "integer field, but no integer?\n");
230 ret = r;
231 continue;
232 }
233 v9ses->dfltgid = make_kgid(current_user_ns(), option);
234 if (!gid_valid(v9ses->dfltgid)) {
235 p9_debug(P9_DEBUG_ERROR,
236 "gid field, but not a gid?\n");
237 ret = -EINVAL;
238 }
239 break;
240 case Opt_afid:
241 r = match_int(&args[0], &option);
242 if (r < 0) {
243 p9_debug(P9_DEBUG_ERROR,
244 "integer field, but no integer?\n");
245 ret = r;
246 } else {
247 v9ses->afid = option;
248 }
249 break;
250 case Opt_uname:
251 kfree(v9ses->uname);
252 v9ses->uname = match_strdup(&args[0]);
253 if (!v9ses->uname) {
254 ret = -ENOMEM;
255 goto free_and_return;
256 }
257 break;
258 case Opt_remotename:
259 kfree(v9ses->aname);
260 v9ses->aname = match_strdup(&args[0]);
261 if (!v9ses->aname) {
262 ret = -ENOMEM;
263 goto free_and_return;
264 }
265 break;
266 case Opt_nodevmap:
267 v9ses->nodev = 1;
268 break;
269 case Opt_cache_loose:
270 v9ses->cache = CACHE_LOOSE;
271 break;
272 case Opt_fscache:
273 v9ses->cache = CACHE_FSCACHE;
274 break;
275 case Opt_mmap:
276 v9ses->cache = CACHE_MMAP;
277 break;
278 case Opt_cachetag:
279#ifdef CONFIG_9P_FSCACHE
280 kfree(v9ses->cachetag);
281 v9ses->cachetag = match_strdup(&args[0]);
282 if (!v9ses->cachetag) {
283 ret = -ENOMEM;
284 goto free_and_return;
285 }
286#endif
287 break;
288 case Opt_cache:
289 s = match_strdup(&args[0]);
290 if (!s) {
291 ret = -ENOMEM;
292 p9_debug(P9_DEBUG_ERROR,
293 "problem allocating copy of cache arg\n");
294 goto free_and_return;
295 }
296 r = get_cache_mode(s);
297 if (r < 0)
298 ret = r;
299 else
300 v9ses->cache = r;
301
302 kfree(s);
303 break;
304
305 case Opt_access:
306 s = match_strdup(&args[0]);
307 if (!s) {
308 ret = -ENOMEM;
309 p9_debug(P9_DEBUG_ERROR,
310 "problem allocating copy of access arg\n");
311 goto free_and_return;
312 }
313
314 v9ses->flags &= ~V9FS_ACCESS_MASK;
315 if (strcmp(s, "user") == 0)
316 v9ses->flags |= V9FS_ACCESS_USER;
317 else if (strcmp(s, "any") == 0)
318 v9ses->flags |= V9FS_ACCESS_ANY;
319 else if (strcmp(s, "client") == 0) {
320 v9ses->flags |= V9FS_ACCESS_CLIENT;
321 } else {
322 uid_t uid;
323 v9ses->flags |= V9FS_ACCESS_SINGLE;
324 uid = simple_strtoul(s, &e, 10);
325 if (*e != '\0') {
326 ret = -EINVAL;
327 pr_info("Unknown access argument %s\n",
328 s);
329 kfree(s);
330 continue;
331 }
332 v9ses->uid = make_kuid(current_user_ns(), uid);
333 if (!uid_valid(v9ses->uid)) {
334 ret = -EINVAL;
335 pr_info("Unknown uid %s\n", s);
336 }
337 }
338
339 kfree(s);
340 break;
341
342 case Opt_posixacl:
343#ifdef CONFIG_9P_FS_POSIX_ACL
344 v9ses->flags |= V9FS_POSIX_ACL;
345#else
346 p9_debug(P9_DEBUG_ERROR,
347 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
348#endif
349 break;
350
351 case Opt_locktimeout:
352 r = match_int(&args[0], &option);
353 if (r < 0) {
354 p9_debug(P9_DEBUG_ERROR,
355 "integer field, but no integer?\n");
356 ret = r;
357 continue;
358 }
359 if (option < 1) {
360 p9_debug(P9_DEBUG_ERROR,
361 "locktimeout must be a greater than zero integer.\n");
362 ret = -EINVAL;
363 continue;
364 }
365 v9ses->session_lock_timeout = (long)option * HZ;
366 break;
367
368 default:
369 continue;
370 }
371 }
372
373free_and_return:
374 kfree(tmp_options);
375fail_option_alloc:
376 return ret;
377}
378
379
380
381
382
383
384
385
386
387struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
388 const char *dev_name, char *data)
389{
390 struct p9_fid *fid;
391 int rc = -ENOMEM;
392
393 v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
394 if (!v9ses->uname)
395 goto err_names;
396
397 v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
398 if (!v9ses->aname)
399 goto err_names;
400 init_rwsem(&v9ses->rename_sem);
401
402 v9ses->uid = INVALID_UID;
403 v9ses->dfltuid = V9FS_DEFUID;
404 v9ses->dfltgid = V9FS_DEFGID;
405
406 v9ses->clnt = p9_client_create(dev_name, data);
407 if (IS_ERR(v9ses->clnt)) {
408 rc = PTR_ERR(v9ses->clnt);
409 p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
410 goto err_names;
411 }
412
413 v9ses->flags = V9FS_ACCESS_USER;
414
415 if (p9_is_proto_dotl(v9ses->clnt)) {
416 v9ses->flags = V9FS_ACCESS_CLIENT;
417 v9ses->flags |= V9FS_PROTO_2000L;
418 } else if (p9_is_proto_dotu(v9ses->clnt)) {
419 v9ses->flags |= V9FS_PROTO_2000U;
420 }
421
422 rc = v9fs_parse_options(v9ses, data);
423 if (rc < 0)
424 goto err_clnt;
425
426 v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
427
428 if (!v9fs_proto_dotl(v9ses) &&
429 ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
430
431
432
433
434 v9ses->flags &= ~V9FS_ACCESS_MASK;
435 v9ses->flags |= V9FS_ACCESS_USER;
436 }
437
438
439 if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
440 ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
441
442 v9ses->flags &= ~V9FS_ACCESS_MASK;
443 v9ses->flags |= V9FS_ACCESS_ANY;
444 v9ses->uid = INVALID_UID;
445 }
446 if (!v9fs_proto_dotl(v9ses) ||
447 !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
448
449
450
451
452 v9ses->flags &= ~V9FS_ACL_MASK;
453 }
454
455 fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
456 v9ses->aname);
457 if (IS_ERR(fid)) {
458 rc = PTR_ERR(fid);
459 p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
460 goto err_clnt;
461 }
462
463 if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
464 fid->uid = v9ses->uid;
465 else
466 fid->uid = INVALID_UID;
467
468#ifdef CONFIG_9P_FSCACHE
469
470 v9fs_cache_session_get_cookie(v9ses);
471#endif
472 spin_lock(&v9fs_sessionlist_lock);
473 list_add(&v9ses->slist, &v9fs_sessionlist);
474 spin_unlock(&v9fs_sessionlist_lock);
475
476 return fid;
477
478err_clnt:
479#ifdef CONFIG_9P_FSCACHE
480 kfree(v9ses->cachetag);
481#endif
482 p9_client_destroy(v9ses->clnt);
483err_names:
484 kfree(v9ses->uname);
485 kfree(v9ses->aname);
486 return ERR_PTR(rc);
487}
488
489
490
491
492
493
494
495void v9fs_session_close(struct v9fs_session_info *v9ses)
496{
497 if (v9ses->clnt) {
498 p9_client_destroy(v9ses->clnt);
499 v9ses->clnt = NULL;
500 }
501
502#ifdef CONFIG_9P_FSCACHE
503 if (v9ses->fscache)
504 v9fs_cache_session_put_cookie(v9ses);
505 kfree(v9ses->cachetag);
506#endif
507 kfree(v9ses->uname);
508 kfree(v9ses->aname);
509
510 spin_lock(&v9fs_sessionlist_lock);
511 list_del(&v9ses->slist);
512 spin_unlock(&v9fs_sessionlist_lock);
513}
514
515
516
517
518
519
520
521
522void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
523 p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
524 p9_client_disconnect(v9ses->clnt);
525}
526
527
528
529
530
531
532
533
534void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
535{
536 p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
537 p9_client_begin_disconnect(v9ses->clnt);
538}
539
540extern int v9fs_error_init(void);
541
542static struct kobject *v9fs_kobj;
543
544#ifdef CONFIG_9P_FSCACHE
545
546
547
548
549
550
551static ssize_t caches_show(struct kobject *kobj,
552 struct kobj_attribute *attr,
553 char *buf)
554{
555 ssize_t n = 0, count = 0, limit = PAGE_SIZE;
556 struct v9fs_session_info *v9ses;
557
558 spin_lock(&v9fs_sessionlist_lock);
559 list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
560 if (v9ses->cachetag) {
561 n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
562 if (n < 0) {
563 count = n;
564 break;
565 }
566
567 count += n;
568 limit -= n;
569 }
570 }
571
572 spin_unlock(&v9fs_sessionlist_lock);
573 return count;
574}
575
576static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
577#endif
578
579static struct attribute *v9fs_attrs[] = {
580#ifdef CONFIG_9P_FSCACHE
581 &v9fs_attr_cache.attr,
582#endif
583 NULL,
584};
585
586static struct attribute_group v9fs_attr_group = {
587 .attrs = v9fs_attrs,
588};
589
590
591
592
593
594
595static int __init v9fs_sysfs_init(void)
596{
597 v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
598 if (!v9fs_kobj)
599 return -ENOMEM;
600
601 if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
602 kobject_put(v9fs_kobj);
603 return -ENOMEM;
604 }
605
606 return 0;
607}
608
609
610
611
612
613
614static void v9fs_sysfs_cleanup(void)
615{
616 sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
617 kobject_put(v9fs_kobj);
618}
619
620static void v9fs_inode_init_once(void *foo)
621{
622 struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
623#ifdef CONFIG_9P_FSCACHE
624 v9inode->fscache = NULL;
625#endif
626 memset(&v9inode->qid, 0, sizeof(v9inode->qid));
627 inode_init_once(&v9inode->vfs_inode);
628}
629
630
631
632
633
634static int v9fs_init_inode_cache(void)
635{
636 v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
637 sizeof(struct v9fs_inode),
638 0, (SLAB_RECLAIM_ACCOUNT|
639 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
640 v9fs_inode_init_once);
641 if (!v9fs_inode_cache)
642 return -ENOMEM;
643
644 return 0;
645}
646
647
648
649
650
651static void v9fs_destroy_inode_cache(void)
652{
653
654
655
656
657 rcu_barrier();
658 kmem_cache_destroy(v9fs_inode_cache);
659}
660
661static int v9fs_cache_register(void)
662{
663 int ret;
664 ret = v9fs_init_inode_cache();
665 if (ret < 0)
666 return ret;
667#ifdef CONFIG_9P_FSCACHE
668 ret = fscache_register_netfs(&v9fs_cache_netfs);
669 if (ret < 0)
670 v9fs_destroy_inode_cache();
671#endif
672 return ret;
673}
674
675static void v9fs_cache_unregister(void)
676{
677 v9fs_destroy_inode_cache();
678#ifdef CONFIG_9P_FSCACHE
679 fscache_unregister_netfs(&v9fs_cache_netfs);
680#endif
681}
682
683
684
685
686
687
688static int __init init_v9fs(void)
689{
690 int err;
691 pr_info("Installing v9fs 9p2000 file system support\n");
692
693
694 err = v9fs_cache_register();
695 if (err < 0) {
696 pr_err("Failed to register v9fs for caching\n");
697 return err;
698 }
699
700 err = v9fs_sysfs_init();
701 if (err < 0) {
702 pr_err("Failed to register with sysfs\n");
703 goto out_cache;
704 }
705 err = register_filesystem(&v9fs_fs_type);
706 if (err < 0) {
707 pr_err("Failed to register filesystem\n");
708 goto out_sysfs_cleanup;
709 }
710
711 return 0;
712
713out_sysfs_cleanup:
714 v9fs_sysfs_cleanup();
715
716out_cache:
717 v9fs_cache_unregister();
718
719 return err;
720}
721
722
723
724
725
726
727static void __exit exit_v9fs(void)
728{
729 v9fs_sysfs_cleanup();
730 v9fs_cache_unregister();
731 unregister_filesystem(&v9fs_fs_type);
732}
733
734module_init(init_v9fs)
735module_exit(exit_v9fs)
736
737MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
738MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
739MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
740MODULE_LICENSE("GPL");
741
