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