Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[muen/linux.git] / net / ceph / ceph_common.c
1
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/backing-dev.h>
4 #include <linux/ctype.h>
5 #include <linux/fs.h>
6 #include <linux/inet.h>
7 #include <linux/in6.h>
8 #include <linux/key.h>
9 #include <keys/ceph-type.h>
10 #include <linux/module.h>
11 #include <linux/mount.h>
12 #include <linux/nsproxy.h>
13 #include <linux/parser.h>
14 #include <linux/sched.h>
15 #include <linux/seq_file.h>
16 #include <linux/slab.h>
17 #include <linux/statfs.h>
18 #include <linux/string.h>
19 #include <linux/vmalloc.h>
20
21
22 #include <linux/ceph/ceph_features.h>
23 #include <linux/ceph/libceph.h>
24 #include <linux/ceph/debugfs.h>
25 #include <linux/ceph/decode.h>
26 #include <linux/ceph/mon_client.h>
27 #include <linux/ceph/auth.h>
28 #include "crypto.h"
29
30
31 /*
32  * Module compatibility interface.  For now it doesn't do anything,
33  * but its existence signals a certain level of functionality.
34  *
35  * The data buffer is used to pass information both to and from
36  * libceph.  The return value indicates whether libceph determines
37  * it is compatible with the caller (from another kernel module),
38  * given the provided data.
39  *
40  * The data pointer can be null.
41  */
42 bool libceph_compatible(void *data)
43 {
44         return true;
45 }
46 EXPORT_SYMBOL(libceph_compatible);
47
48 /*
49  * find filename portion of a path (/foo/bar/baz -> baz)
50  */
51 const char *ceph_file_part(const char *s, int len)
52 {
53         const char *e = s + len;
54
55         while (e != s && *(e-1) != '/')
56                 e--;
57         return e;
58 }
59 EXPORT_SYMBOL(ceph_file_part);
60
61 const char *ceph_msg_type_name(int type)
62 {
63         switch (type) {
64         case CEPH_MSG_SHUTDOWN: return "shutdown";
65         case CEPH_MSG_PING: return "ping";
66         case CEPH_MSG_AUTH: return "auth";
67         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
68         case CEPH_MSG_MON_MAP: return "mon_map";
69         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
70         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
71         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
72         case CEPH_MSG_STATFS: return "statfs";
73         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
74         case CEPH_MSG_MON_GET_VERSION: return "mon_get_version";
75         case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply";
76         case CEPH_MSG_MDS_MAP: return "mds_map";
77         case CEPH_MSG_CLIENT_SESSION: return "client_session";
78         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
79         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
80         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
81         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
82         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
83         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
84         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
85         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
86         case CEPH_MSG_OSD_MAP: return "osd_map";
87         case CEPH_MSG_OSD_OP: return "osd_op";
88         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
89         case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
90         default: return "unknown";
91         }
92 }
93 EXPORT_SYMBOL(ceph_msg_type_name);
94
95 /*
96  * Initially learn our fsid, or verify an fsid matches.
97  */
98 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
99 {
100         if (client->have_fsid) {
101                 if (ceph_fsid_compare(&client->fsid, fsid)) {
102                         pr_err("bad fsid, had %pU got %pU",
103                                &client->fsid, fsid);
104                         return -1;
105                 }
106         } else {
107                 memcpy(&client->fsid, fsid, sizeof(*fsid));
108         }
109         return 0;
110 }
111 EXPORT_SYMBOL(ceph_check_fsid);
112
113 static int strcmp_null(const char *s1, const char *s2)
114 {
115         if (!s1 && !s2)
116                 return 0;
117         if (s1 && !s2)
118                 return -1;
119         if (!s1 && s2)
120                 return 1;
121         return strcmp(s1, s2);
122 }
123
124 int ceph_compare_options(struct ceph_options *new_opt,
125                          struct ceph_client *client)
126 {
127         struct ceph_options *opt1 = new_opt;
128         struct ceph_options *opt2 = client->options;
129         int ofs = offsetof(struct ceph_options, mon_addr);
130         int i;
131         int ret;
132
133         /*
134          * Don't bother comparing options if network namespaces don't
135          * match.
136          */
137         if (!net_eq(current->nsproxy->net_ns, read_pnet(&client->msgr.net)))
138                 return -1;
139
140         ret = memcmp(opt1, opt2, ofs);
141         if (ret)
142                 return ret;
143
144         ret = strcmp_null(opt1->name, opt2->name);
145         if (ret)
146                 return ret;
147
148         if (opt1->key && !opt2->key)
149                 return -1;
150         if (!opt1->key && opt2->key)
151                 return 1;
152         if (opt1->key && opt2->key) {
153                 if (opt1->key->type != opt2->key->type)
154                         return -1;
155                 if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
156                         return -1;
157                 if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
158                         return -1;
159                 if (opt1->key->len != opt2->key->len)
160                         return -1;
161                 if (opt1->key->key && !opt2->key->key)
162                         return -1;
163                 if (!opt1->key->key && opt2->key->key)
164                         return 1;
165                 if (opt1->key->key && opt2->key->key) {
166                         ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
167                         if (ret)
168                                 return ret;
169                 }
170         }
171
172         /* any matching mon ip implies a match */
173         for (i = 0; i < opt1->num_mon; i++) {
174                 if (ceph_monmap_contains(client->monc.monmap,
175                                  &opt1->mon_addr[i]))
176                         return 0;
177         }
178         return -1;
179 }
180 EXPORT_SYMBOL(ceph_compare_options);
181
182 void *ceph_kvmalloc(size_t size, gfp_t flags)
183 {
184         if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
185                 void *ptr = kmalloc(size, flags | __GFP_NOWARN);
186                 if (ptr)
187                         return ptr;
188         }
189
190         return __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
191 }
192
193
194 static int parse_fsid(const char *str, struct ceph_fsid *fsid)
195 {
196         int i = 0;
197         char tmp[3];
198         int err = -EINVAL;
199         int d;
200
201         dout("parse_fsid '%s'\n", str);
202         tmp[2] = 0;
203         while (*str && i < 16) {
204                 if (ispunct(*str)) {
205                         str++;
206                         continue;
207                 }
208                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
209                         break;
210                 tmp[0] = str[0];
211                 tmp[1] = str[1];
212                 if (sscanf(tmp, "%x", &d) < 1)
213                         break;
214                 fsid->fsid[i] = d & 0xff;
215                 i++;
216                 str += 2;
217         }
218
219         if (i == 16)
220                 err = 0;
221         dout("parse_fsid ret %d got fsid %pU", err, fsid);
222         return err;
223 }
224
225 /*
226  * ceph options
227  */
228 enum {
229         Opt_osdtimeout,
230         Opt_osdkeepalivetimeout,
231         Opt_mount_timeout,
232         Opt_osd_idle_ttl,
233         Opt_last_int,
234         /* int args above */
235         Opt_fsid,
236         Opt_name,
237         Opt_secret,
238         Opt_key,
239         Opt_ip,
240         Opt_last_string,
241         /* string args above */
242         Opt_share,
243         Opt_noshare,
244         Opt_crc,
245         Opt_nocrc,
246         Opt_cephx_require_signatures,
247         Opt_nocephx_require_signatures,
248         Opt_tcp_nodelay,
249         Opt_notcp_nodelay,
250 };
251
252 static match_table_t opt_tokens = {
253         {Opt_osdtimeout, "osdtimeout=%d"},
254         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
255         {Opt_mount_timeout, "mount_timeout=%d"},
256         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
257         /* int args above */
258         {Opt_fsid, "fsid=%s"},
259         {Opt_name, "name=%s"},
260         {Opt_secret, "secret=%s"},
261         {Opt_key, "key=%s"},
262         {Opt_ip, "ip=%s"},
263         /* string args above */
264         {Opt_share, "share"},
265         {Opt_noshare, "noshare"},
266         {Opt_crc, "crc"},
267         {Opt_nocrc, "nocrc"},
268         {Opt_cephx_require_signatures, "cephx_require_signatures"},
269         {Opt_nocephx_require_signatures, "nocephx_require_signatures"},
270         {Opt_tcp_nodelay, "tcp_nodelay"},
271         {Opt_notcp_nodelay, "notcp_nodelay"},
272         {-1, NULL}
273 };
274
275 void ceph_destroy_options(struct ceph_options *opt)
276 {
277         dout("destroy_options %p\n", opt);
278         kfree(opt->name);
279         if (opt->key) {
280                 ceph_crypto_key_destroy(opt->key);
281                 kfree(opt->key);
282         }
283         kfree(opt->mon_addr);
284         kfree(opt);
285 }
286 EXPORT_SYMBOL(ceph_destroy_options);
287
288 /* get secret from key store */
289 static int get_secret(struct ceph_crypto_key *dst, const char *name) {
290         struct key *ukey;
291         int key_err;
292         int err = 0;
293         struct ceph_crypto_key *ckey;
294
295         ukey = request_key(&key_type_ceph, name, NULL);
296         if (!ukey || IS_ERR(ukey)) {
297                 /* request_key errors don't map nicely to mount(2)
298                    errors; don't even try, but still printk */
299                 key_err = PTR_ERR(ukey);
300                 switch (key_err) {
301                 case -ENOKEY:
302                         pr_warn("ceph: Mount failed due to key not found: %s\n",
303                                 name);
304                         break;
305                 case -EKEYEXPIRED:
306                         pr_warn("ceph: Mount failed due to expired key: %s\n",
307                                 name);
308                         break;
309                 case -EKEYREVOKED:
310                         pr_warn("ceph: Mount failed due to revoked key: %s\n",
311                                 name);
312                         break;
313                 default:
314                         pr_warn("ceph: Mount failed due to unknown key error %d: %s\n",
315                                 key_err, name);
316                 }
317                 err = -EPERM;
318                 goto out;
319         }
320
321         ckey = ukey->payload.data;
322         err = ceph_crypto_key_clone(dst, ckey);
323         if (err)
324                 goto out_key;
325         /* pass through, err is 0 */
326
327 out_key:
328         key_put(ukey);
329 out:
330         return err;
331 }
332
333 struct ceph_options *
334 ceph_parse_options(char *options, const char *dev_name,
335                         const char *dev_name_end,
336                         int (*parse_extra_token)(char *c, void *private),
337                         void *private)
338 {
339         struct ceph_options *opt;
340         const char *c;
341         int err = -ENOMEM;
342         substring_t argstr[MAX_OPT_ARGS];
343
344         opt = kzalloc(sizeof(*opt), GFP_KERNEL);
345         if (!opt)
346                 return ERR_PTR(-ENOMEM);
347         opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
348                                 GFP_KERNEL);
349         if (!opt->mon_addr)
350                 goto out;
351
352         dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
353              dev_name);
354
355         /* start with defaults */
356         opt->flags = CEPH_OPT_DEFAULT;
357         opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
358         opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
359         opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
360         opt->monc_ping_timeout = CEPH_MONC_PING_TIMEOUT_DEFAULT;
361
362         /* get mon ip(s) */
363         /* ip1[:port1][,ip2[:port2]...] */
364         err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
365                              CEPH_MAX_MON, &opt->num_mon);
366         if (err < 0)
367                 goto out;
368
369         /* parse mount options */
370         while ((c = strsep(&options, ",")) != NULL) {
371                 int token, intval, ret;
372                 if (!*c)
373                         continue;
374                 err = -EINVAL;
375                 token = match_token((char *)c, opt_tokens, argstr);
376                 if (token < 0 && parse_extra_token) {
377                         /* extra? */
378                         err = parse_extra_token((char *)c, private);
379                         if (err < 0) {
380                                 pr_err("bad option at '%s'\n", c);
381                                 goto out;
382                         }
383                         continue;
384                 }
385                 if (token < Opt_last_int) {
386                         ret = match_int(&argstr[0], &intval);
387                         if (ret < 0) {
388                                 pr_err("bad mount option arg (not int) "
389                                        "at '%s'\n", c);
390                                 continue;
391                         }
392                         dout("got int token %d val %d\n", token, intval);
393                 } else if (token > Opt_last_int && token < Opt_last_string) {
394                         dout("got string token %d val %s\n", token,
395                              argstr[0].from);
396                 } else {
397                         dout("got token %d\n", token);
398                 }
399                 switch (token) {
400                 case Opt_ip:
401                         err = ceph_parse_ips(argstr[0].from,
402                                              argstr[0].to,
403                                              &opt->my_addr,
404                                              1, NULL);
405                         if (err < 0)
406                                 goto out;
407                         opt->flags |= CEPH_OPT_MYIP;
408                         break;
409
410                 case Opt_fsid:
411                         err = parse_fsid(argstr[0].from, &opt->fsid);
412                         if (err == 0)
413                                 opt->flags |= CEPH_OPT_FSID;
414                         break;
415                 case Opt_name:
416                         opt->name = kstrndup(argstr[0].from,
417                                               argstr[0].to-argstr[0].from,
418                                               GFP_KERNEL);
419                         break;
420                 case Opt_secret:
421                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
422                         if (!opt->key) {
423                                 err = -ENOMEM;
424                                 goto out;
425                         }
426                         err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
427                         if (err < 0)
428                                 goto out;
429                         break;
430                 case Opt_key:
431                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
432                         if (!opt->key) {
433                                 err = -ENOMEM;
434                                 goto out;
435                         }
436                         err = get_secret(opt->key, argstr[0].from);
437                         if (err < 0)
438                                 goto out;
439                         break;
440
441                         /* misc */
442                 case Opt_osdtimeout:
443                         pr_warn("ignoring deprecated osdtimeout option\n");
444                         break;
445                 case Opt_osdkeepalivetimeout:
446                         /* 0 isn't well defined right now, reject it */
447                         if (intval < 1 || intval > INT_MAX / 1000) {
448                                 pr_err("osdkeepalive out of range\n");
449                                 err = -EINVAL;
450                                 goto out;
451                         }
452                         opt->osd_keepalive_timeout =
453                                         msecs_to_jiffies(intval * 1000);
454                         break;
455                 case Opt_osd_idle_ttl:
456                         /* 0 isn't well defined right now, reject it */
457                         if (intval < 1 || intval > INT_MAX / 1000) {
458                                 pr_err("osd_idle_ttl out of range\n");
459                                 err = -EINVAL;
460                                 goto out;
461                         }
462                         opt->osd_idle_ttl = msecs_to_jiffies(intval * 1000);
463                         break;
464                 case Opt_mount_timeout:
465                         /* 0 is "wait forever" (i.e. infinite timeout) */
466                         if (intval < 0 || intval > INT_MAX / 1000) {
467                                 pr_err("mount_timeout out of range\n");
468                                 err = -EINVAL;
469                                 goto out;
470                         }
471                         opt->mount_timeout = msecs_to_jiffies(intval * 1000);
472                         break;
473
474                 case Opt_share:
475                         opt->flags &= ~CEPH_OPT_NOSHARE;
476                         break;
477                 case Opt_noshare:
478                         opt->flags |= CEPH_OPT_NOSHARE;
479                         break;
480
481                 case Opt_crc:
482                         opt->flags &= ~CEPH_OPT_NOCRC;
483                         break;
484                 case Opt_nocrc:
485                         opt->flags |= CEPH_OPT_NOCRC;
486                         break;
487
488                 case Opt_cephx_require_signatures:
489                         opt->flags &= ~CEPH_OPT_NOMSGAUTH;
490                         break;
491                 case Opt_nocephx_require_signatures:
492                         opt->flags |= CEPH_OPT_NOMSGAUTH;
493                         break;
494
495                 case Opt_tcp_nodelay:
496                         opt->flags |= CEPH_OPT_TCP_NODELAY;
497                         break;
498                 case Opt_notcp_nodelay:
499                         opt->flags &= ~CEPH_OPT_TCP_NODELAY;
500                         break;
501
502                 default:
503                         BUG_ON(token);
504                 }
505         }
506
507         /* success */
508         return opt;
509
510 out:
511         ceph_destroy_options(opt);
512         return ERR_PTR(err);
513 }
514 EXPORT_SYMBOL(ceph_parse_options);
515
516 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client)
517 {
518         struct ceph_options *opt = client->options;
519         size_t pos = m->count;
520
521         if (opt->name) {
522                 seq_puts(m, "name=");
523                 seq_escape(m, opt->name, ", \t\n\\");
524                 seq_putc(m, ',');
525         }
526         if (opt->key)
527                 seq_puts(m, "secret=<hidden>,");
528
529         if (opt->flags & CEPH_OPT_FSID)
530                 seq_printf(m, "fsid=%pU,", &opt->fsid);
531         if (opt->flags & CEPH_OPT_NOSHARE)
532                 seq_puts(m, "noshare,");
533         if (opt->flags & CEPH_OPT_NOCRC)
534                 seq_puts(m, "nocrc,");
535         if (opt->flags & CEPH_OPT_NOMSGAUTH)
536                 seq_puts(m, "nocephx_require_signatures,");
537         if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
538                 seq_puts(m, "notcp_nodelay,");
539
540         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
541                 seq_printf(m, "mount_timeout=%d,",
542                            jiffies_to_msecs(opt->mount_timeout) / 1000);
543         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
544                 seq_printf(m, "osd_idle_ttl=%d,",
545                            jiffies_to_msecs(opt->osd_idle_ttl) / 1000);
546         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
547                 seq_printf(m, "osdkeepalivetimeout=%d,",
548                     jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);
549
550         /* drop redundant comma */
551         if (m->count != pos)
552                 m->count--;
553
554         return 0;
555 }
556 EXPORT_SYMBOL(ceph_print_client_options);
557
558 u64 ceph_client_id(struct ceph_client *client)
559 {
560         return client->monc.auth->global_id;
561 }
562 EXPORT_SYMBOL(ceph_client_id);
563
564 /*
565  * create a fresh client instance
566  */
567 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private,
568                                        u64 supported_features,
569                                        u64 required_features)
570 {
571         struct ceph_client *client;
572         struct ceph_entity_addr *myaddr = NULL;
573         int err = -ENOMEM;
574
575         client = kzalloc(sizeof(*client), GFP_KERNEL);
576         if (client == NULL)
577                 return ERR_PTR(-ENOMEM);
578
579         client->private = private;
580         client->options = opt;
581
582         mutex_init(&client->mount_mutex);
583         init_waitqueue_head(&client->auth_wq);
584         client->auth_err = 0;
585
586         if (!ceph_test_opt(client, NOMSGAUTH))
587                 required_features |= CEPH_FEATURE_MSG_AUTH;
588
589         client->extra_mon_dispatch = NULL;
590         client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT |
591                 supported_features;
592         client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT |
593                 required_features;
594
595         /* msgr */
596         if (ceph_test_opt(client, MYIP))
597                 myaddr = &client->options->my_addr;
598
599         ceph_messenger_init(&client->msgr, myaddr,
600                 client->supported_features,
601                 client->required_features,
602                 ceph_test_opt(client, NOCRC),
603                 ceph_test_opt(client, TCP_NODELAY));
604
605         /* subsystems */
606         err = ceph_monc_init(&client->monc, client);
607         if (err < 0)
608                 goto fail;
609         err = ceph_osdc_init(&client->osdc, client);
610         if (err < 0)
611                 goto fail_monc;
612
613         return client;
614
615 fail_monc:
616         ceph_monc_stop(&client->monc);
617 fail:
618         ceph_messenger_fini(&client->msgr);
619         kfree(client);
620         return ERR_PTR(err);
621 }
622 EXPORT_SYMBOL(ceph_create_client);
623
624 void ceph_destroy_client(struct ceph_client *client)
625 {
626         dout("destroy_client %p\n", client);
627
628         atomic_set(&client->msgr.stopping, 1);
629
630         /* unmount */
631         ceph_osdc_stop(&client->osdc);
632         ceph_monc_stop(&client->monc);
633         ceph_messenger_fini(&client->msgr);
634
635         ceph_debugfs_client_cleanup(client);
636
637         ceph_destroy_options(client->options);
638
639         kfree(client);
640         dout("destroy_client %p done\n", client);
641 }
642 EXPORT_SYMBOL(ceph_destroy_client);
643
644 /*
645  * true if we have the mon map (and have thus joined the cluster)
646  */
647 static int have_mon_and_osd_map(struct ceph_client *client)
648 {
649         return client->monc.monmap && client->monc.monmap->epoch &&
650                client->osdc.osdmap && client->osdc.osdmap->epoch;
651 }
652
653 /*
654  * mount: join the ceph cluster, and open root directory.
655  */
656 int __ceph_open_session(struct ceph_client *client, unsigned long started)
657 {
658         unsigned long timeout = client->options->mount_timeout;
659         long err;
660
661         /* open session, and wait for mon and osd maps */
662         err = ceph_monc_open_session(&client->monc);
663         if (err < 0)
664                 return err;
665
666         while (!have_mon_and_osd_map(client)) {
667                 if (timeout && time_after_eq(jiffies, started + timeout))
668                         return -ETIMEDOUT;
669
670                 /* wait */
671                 dout("mount waiting for mon_map\n");
672                 err = wait_event_interruptible_timeout(client->auth_wq,
673                         have_mon_and_osd_map(client) || (client->auth_err < 0),
674                         ceph_timeout_jiffies(timeout));
675                 if (err < 0)
676                         return err;
677                 if (client->auth_err < 0)
678                         return client->auth_err;
679         }
680
681         return 0;
682 }
683 EXPORT_SYMBOL(__ceph_open_session);
684
685
686 int ceph_open_session(struct ceph_client *client)
687 {
688         int ret;
689         unsigned long started = jiffies;  /* note the start time */
690
691         dout("open_session start\n");
692         mutex_lock(&client->mount_mutex);
693
694         ret = __ceph_open_session(client, started);
695
696         mutex_unlock(&client->mount_mutex);
697         return ret;
698 }
699 EXPORT_SYMBOL(ceph_open_session);
700
701
702 static int __init init_ceph_lib(void)
703 {
704         int ret = 0;
705
706         ret = ceph_debugfs_init();
707         if (ret < 0)
708                 goto out;
709
710         ret = ceph_crypto_init();
711         if (ret < 0)
712                 goto out_debugfs;
713
714         ret = ceph_msgr_init();
715         if (ret < 0)
716                 goto out_crypto;
717
718         ret = ceph_osdc_setup();
719         if (ret < 0)
720                 goto out_msgr;
721
722         pr_info("loaded (mon/osd proto %d/%d)\n",
723                 CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);
724
725         return 0;
726
727 out_msgr:
728         ceph_msgr_exit();
729 out_crypto:
730         ceph_crypto_shutdown();
731 out_debugfs:
732         ceph_debugfs_cleanup();
733 out:
734         return ret;
735 }
736
737 static void __exit exit_ceph_lib(void)
738 {
739         dout("exit_ceph_lib\n");
740         ceph_osdc_cleanup();
741         ceph_msgr_exit();
742         ceph_crypto_shutdown();
743         ceph_debugfs_cleanup();
744 }
745
746 module_init(init_ceph_lib);
747 module_exit(exit_ceph_lib);
748
749 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
750 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
751 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
752 MODULE_DESCRIPTION("Ceph core library");
753 MODULE_LICENSE("GPL");