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