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Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / net / ceph / ceph_common.c
blob4e7edd707a14b9e6b21579c1a445971ecb992b0e
1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/ceph/ceph_debug.h>
4 #include <linux/backing-dev.h>
5 #include <linux/ctype.h>
6 #include <linux/fs.h>
7 #include <linux/inet.h>
8 #include <linux/in6.h>
9 #include <linux/key.h>
10 #include <keys/ceph-type.h>
11 #include <linux/module.h>
12 #include <linux/mount.h>
13 #include <linux/nsproxy.h>
14 #include <linux/fs_parser.h>
15 #include <linux/sched.h>
16 #include <linux/sched/mm.h>
17 #include <linux/seq_file.h>
18 #include <linux/slab.h>
19 #include <linux/statfs.h>
20 #include <linux/string.h>
21 #include <linux/vmalloc.h>
22
23
24 #include <linux/ceph/ceph_features.h>
25 #include <linux/ceph/libceph.h>
26 #include <linux/ceph/debugfs.h>
27 #include <linux/ceph/decode.h>
28 #include <linux/ceph/mon_client.h>
29 #include <linux/ceph/auth.h>
30 #include "crypto.h"
31
32
33 /*
34 * Module compatibility interface. For now it doesn't do anything,
35 * but its existence signals a certain level of functionality.
36 *
37 * The data buffer is used to pass information both to and from
38 * libceph. The return value indicates whether libceph determines
39 * it is compatible with the caller (from another kernel module),
40 * given the provided data.
41 *
42 * The data pointer can be null.
43 */
44 bool libceph_compatible(void *data)
45 {
46 return true;
47 }
48 EXPORT_SYMBOL(libceph_compatible);
49
50 static int param_get_supported_features(char *buffer,
51 const struct kernel_param *kp)
52 {
53 return sprintf(buffer, "0x%llx", CEPH_FEATURES_SUPPORTED_DEFAULT);
54 }
55 static const struct kernel_param_ops param_ops_supported_features = {
56 .get = param_get_supported_features,
57 };
58 module_param_cb(supported_features, &param_ops_supported_features, NULL,
59 0444);
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_FS_MAP_USER: return "fs_map_user";
78 case CEPH_MSG_CLIENT_SESSION: return "client_session";
79 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
80 case CEPH_MSG_CLIENT_REQUEST: return "client_request";
81 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
82 case CEPH_MSG_CLIENT_REPLY: return "client_reply";
83 case CEPH_MSG_CLIENT_CAPS: return "client_caps";
84 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
85 case CEPH_MSG_CLIENT_QUOTA: return "client_quota";
86 case CEPH_MSG_CLIENT_SNAP: return "client_snap";
87 case CEPH_MSG_CLIENT_LEASE: return "client_lease";
88 case CEPH_MSG_POOLOP_REPLY: return "poolop_reply";
89 case CEPH_MSG_POOLOP: return "poolop";
90 case CEPH_MSG_MON_COMMAND: return "mon_command";
91 case CEPH_MSG_MON_COMMAND_ACK: return "mon_command_ack";
92 case CEPH_MSG_OSD_MAP: return "osd_map";
93 case CEPH_MSG_OSD_OP: return "osd_op";
94 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
95 case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
96 case CEPH_MSG_OSD_BACKOFF: return "osd_backoff";
97 default: return "unknown";
98 }
99 }
100 EXPORT_SYMBOL(ceph_msg_type_name);
101
102 /*
103 * Initially learn our fsid, or verify an fsid matches.
104 */
105 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
106 {
107 if (client->have_fsid) {
108 if (ceph_fsid_compare(&client->fsid, fsid)) {
109 pr_err("bad fsid, had %pU got %pU",
110 &client->fsid, fsid);
111 return -1;
112 }
113 } else {
114 memcpy(&client->fsid, fsid, sizeof(*fsid));
115 }
116 return 0;
117 }
118 EXPORT_SYMBOL(ceph_check_fsid);
119
120 static int strcmp_null(const char *s1, const char *s2)
121 {
122 if (!s1 && !s2)
123 return 0;
124 if (s1 && !s2)
125 return -1;
126 if (!s1 && s2)
127 return 1;
128 return strcmp(s1, s2);
129 }
130
131 int ceph_compare_options(struct ceph_options *new_opt,
132 struct ceph_client *client)
133 {
134 struct ceph_options *opt1 = new_opt;
135 struct ceph_options *opt2 = client->options;
136 int ofs = offsetof(struct ceph_options, mon_addr);
137 int i;
138 int ret;
139
140 /*
141 * Don't bother comparing options if network namespaces don't
142 * match.
143 */
144 if (!net_eq(current->nsproxy->net_ns, read_pnet(&client->msgr.net)))
145 return -1;
146
147 ret = memcmp(opt1, opt2, ofs);
148 if (ret)
149 return ret;
150
151 ret = strcmp_null(opt1->name, opt2->name);
152 if (ret)
153 return ret;
154
155 if (opt1->key && !opt2->key)
156 return -1;
157 if (!opt1->key && opt2->key)
158 return 1;
159 if (opt1->key && opt2->key) {
160 if (opt1->key->type != opt2->key->type)
161 return -1;
162 if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
163 return -1;
164 if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
165 return -1;
166 if (opt1->key->len != opt2->key->len)
167 return -1;
168 if (opt1->key->key && !opt2->key->key)
169 return -1;
170 if (!opt1->key->key && opt2->key->key)
171 return 1;
172 if (opt1->key->key && opt2->key->key) {
173 ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
174 if (ret)
175 return ret;
176 }
177 }
178
179 ret = ceph_compare_crush_locs(&opt1->crush_locs, &opt2->crush_locs);
180 if (ret)
181 return ret;
182
183 /* any matching mon ip implies a match */
184 for (i = 0; i < opt1->num_mon; i++) {
185 if (ceph_monmap_contains(client->monc.monmap,
186 &opt1->mon_addr[i]))
187 return 0;
188 }
189 return -1;
190 }
191 EXPORT_SYMBOL(ceph_compare_options);
192
193 /*
194 * kvmalloc() doesn't fall back to the vmalloc allocator unless flags are
195 * compatible with (a superset of) GFP_KERNEL. This is because while the
196 * actual pages are allocated with the specified flags, the page table pages
197 * are always allocated with GFP_KERNEL.
198 *
199 * ceph_kvmalloc() may be called with GFP_KERNEL, GFP_NOFS or GFP_NOIO.
200 */
201 void *ceph_kvmalloc(size_t size, gfp_t flags)
202 {
203 void *p;
204
205 if ((flags & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS)) {
206 p = kvmalloc(size, flags);
207 } else if ((flags & (__GFP_IO | __GFP_FS)) == __GFP_IO) {
208 unsigned int nofs_flag = memalloc_nofs_save();
209 p = kvmalloc(size, GFP_KERNEL);
210 memalloc_nofs_restore(nofs_flag);
211 } else {
212 unsigned int noio_flag = memalloc_noio_save();
213 p = kvmalloc(size, GFP_KERNEL);
214 memalloc_noio_restore(noio_flag);
215 }
216
217 return p;
218 }
219
220 static int parse_fsid(const char *str, struct ceph_fsid *fsid)
221 {
222 int i = 0;
223 char tmp[3];
224 int err = -EINVAL;
225 int d;
226
227 dout("parse_fsid '%s'\n", str);
228 tmp[2] = 0;
229 while (*str && i < 16) {
230 if (ispunct(*str)) {
231 str++;
232 continue;
233 }
234 if (!isxdigit(str[0]) || !isxdigit(str[1]))
235 break;
236 tmp[0] = str[0];
237 tmp[1] = str[1];
238 if (sscanf(tmp, "%x", &d) < 1)
239 break;
240 fsid->fsid[i] = d & 0xff;
241 i++;
242 str += 2;
243 }
244
245 if (i == 16)
246 err = 0;
247 dout("parse_fsid ret %d got fsid %pU\n", err, fsid);
248 return err;
249 }
250
251 /*
252 * ceph options
253 */
254 enum {
255 Opt_osdtimeout,
256 Opt_osdkeepalivetimeout,
257 Opt_mount_timeout,
258 Opt_osd_idle_ttl,
259 Opt_osd_request_timeout,
260 /* int args above */
261 Opt_fsid,
262 Opt_name,
263 Opt_secret,
264 Opt_key,
265 Opt_ip,
266 Opt_crush_location,
267 Opt_read_from_replica,
268 /* string args above */
269 Opt_share,
270 Opt_crc,
271 Opt_cephx_require_signatures,
272 Opt_cephx_sign_messages,
273 Opt_tcp_nodelay,
274 Opt_abort_on_full,
275 };
276
277 enum {
278 Opt_read_from_replica_no,
279 Opt_read_from_replica_balance,
280 Opt_read_from_replica_localize,
281 };
282
283 static const struct constant_table ceph_param_read_from_replica[] = {
284 {"no", Opt_read_from_replica_no},
285 {"balance", Opt_read_from_replica_balance},
286 {"localize", Opt_read_from_replica_localize},
287 {}
288 };
289
290 static const struct fs_parameter_spec ceph_parameters[] = {
291 fsparam_flag ("abort_on_full", Opt_abort_on_full),
292 fsparam_flag_no ("cephx_require_signatures", Opt_cephx_require_signatures),
293 fsparam_flag_no ("cephx_sign_messages", Opt_cephx_sign_messages),
294 fsparam_flag_no ("crc", Opt_crc),
295 fsparam_string ("crush_location", Opt_crush_location),
296 fsparam_string ("fsid", Opt_fsid),
297 fsparam_string ("ip", Opt_ip),
298 fsparam_string ("key", Opt_key),
299 fsparam_u32 ("mount_timeout", Opt_mount_timeout),
300 fsparam_string ("name", Opt_name),
301 fsparam_u32 ("osd_idle_ttl", Opt_osd_idle_ttl),
302 fsparam_u32 ("osd_request_timeout", Opt_osd_request_timeout),
303 fsparam_u32 ("osdkeepalive", Opt_osdkeepalivetimeout),
304 __fsparam (fs_param_is_s32, "osdtimeout", Opt_osdtimeout,
305 fs_param_deprecated, NULL),
306 fsparam_enum ("read_from_replica", Opt_read_from_replica,
307 ceph_param_read_from_replica),
308 fsparam_string ("secret", Opt_secret),
309 fsparam_flag_no ("share", Opt_share),
310 fsparam_flag_no ("tcp_nodelay", Opt_tcp_nodelay),
311 {}
312 };
313
314 struct ceph_options *ceph_alloc_options(void)
315 {
316 struct ceph_options *opt;
317
318 opt = kzalloc(sizeof(*opt), GFP_KERNEL);
319 if (!opt)
320 return NULL;
321
322 opt->crush_locs = RB_ROOT;
323 opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
324 GFP_KERNEL);
325 if (!opt->mon_addr) {
326 kfree(opt);
327 return NULL;
328 }
329
330 opt->flags = CEPH_OPT_DEFAULT;
331 opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
332 opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
333 opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
334 opt->osd_request_timeout = CEPH_OSD_REQUEST_TIMEOUT_DEFAULT;
335 opt->read_from_replica = CEPH_READ_FROM_REPLICA_DEFAULT;
336 return opt;
337 }
338 EXPORT_SYMBOL(ceph_alloc_options);
339
340 void ceph_destroy_options(struct ceph_options *opt)
341 {
342 dout("destroy_options %p\n", opt);
343 if (!opt)
344 return;
345
346 ceph_clear_crush_locs(&opt->crush_locs);
347 kfree(opt->name);
348 if (opt->key) {
349 ceph_crypto_key_destroy(opt->key);
350 kfree(opt->key);
351 }
352 kfree(opt->mon_addr);
353 kfree(opt);
354 }
355 EXPORT_SYMBOL(ceph_destroy_options);
356
357 /* get secret from key store */
358 static int get_secret(struct ceph_crypto_key *dst, const char *name,
359 struct p_log *log)
360 {
361 struct key *ukey;
362 int key_err;
363 int err = 0;
364 struct ceph_crypto_key *ckey;
365
366 ukey = request_key(&key_type_ceph, name, NULL);
367 if (IS_ERR(ukey)) {
368 /* request_key errors don't map nicely to mount(2)
369 errors; don't even try, but still printk */
370 key_err = PTR_ERR(ukey);
371 switch (key_err) {
372 case -ENOKEY:
373 error_plog(log, "Failed due to key not found: %s",
374 name);
375 break;
376 case -EKEYEXPIRED:
377 error_plog(log, "Failed due to expired key: %s",
378 name);
379 break;
380 case -EKEYREVOKED:
381 error_plog(log, "Failed due to revoked key: %s",
382 name);
383 break;
384 default:
385 error_plog(log, "Failed due to key error %d: %s",
386 key_err, name);
387 }
388 err = -EPERM;
389 goto out;
390 }
391
392 ckey = ukey->payload.data[0];
393 err = ceph_crypto_key_clone(dst, ckey);
394 if (err)
395 goto out_key;
396 /* pass through, err is 0 */
397
398 out_key:
399 key_put(ukey);
400 out:
401 return err;
402 }
403
404 int ceph_parse_mon_ips(const char *buf, size_t len, struct ceph_options *opt,
405 struct fc_log *l)
406 {
407 struct p_log log = {.prefix = "libceph", .log = l};
408 int ret;
409
410 /* ip1[:port1][,ip2[:port2]...] */
411 ret = ceph_parse_ips(buf, buf + len, opt->mon_addr, CEPH_MAX_MON,
412 &opt->num_mon);
413 if (ret) {
414 error_plog(&log, "Failed to parse monitor IPs: %d", ret);
415 return ret;
416 }
417
418 return 0;
419 }
420 EXPORT_SYMBOL(ceph_parse_mon_ips);
421
422 int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,
423 struct fc_log *l)
424 {
425 struct fs_parse_result result;
426 int token, err;
427 struct p_log log = {.prefix = "libceph", .log = l};
428
429 token = __fs_parse(&log, ceph_parameters, param, &result);
430 dout("%s fs_parse '%s' token %d\n", __func__, param->key, token);
431 if (token < 0)
432 return token;
433
434 switch (token) {
435 case Opt_ip:
436 err = ceph_parse_ips(param->string,
437 param->string + param->size,
438 &opt->my_addr,
439 1, NULL);
440 if (err) {
441 error_plog(&log, "Failed to parse ip: %d", err);
442 return err;
443 }
444 opt->flags |= CEPH_OPT_MYIP;
445 break;
446
447 case Opt_fsid:
448 err = parse_fsid(param->string, &opt->fsid);
449 if (err) {
450 error_plog(&log, "Failed to parse fsid: %d", err);
451 return err;
452 }
453 opt->flags |= CEPH_OPT_FSID;
454 break;
455 case Opt_name:
456 kfree(opt->name);
457 opt->name = param->string;
458 param->string = NULL;
459 break;
460 case Opt_secret:
461 ceph_crypto_key_destroy(opt->key);
462 kfree(opt->key);
463
464 opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
465 if (!opt->key)
466 return -ENOMEM;
467 err = ceph_crypto_key_unarmor(opt->key, param->string);
468 if (err) {
469 error_plog(&log, "Failed to parse secret: %d", err);
470 return err;
471 }
472 break;
473 case Opt_key:
474 ceph_crypto_key_destroy(opt->key);
475 kfree(opt->key);
476
477 opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
478 if (!opt->key)
479 return -ENOMEM;
480 return get_secret(opt->key, param->string, &log);
481 case Opt_crush_location:
482 ceph_clear_crush_locs(&opt->crush_locs);
483 err = ceph_parse_crush_location(param->string,
484 &opt->crush_locs);
485 if (err) {
486 error_plog(&log, "Failed to parse CRUSH location: %d",
487 err);
488 return err;
489 }
490 break;
491 case Opt_read_from_replica:
492 switch (result.uint_32) {
493 case Opt_read_from_replica_no:
494 opt->read_from_replica = 0;
495 break;
496 case Opt_read_from_replica_balance:
497 opt->read_from_replica = CEPH_OSD_FLAG_BALANCE_READS;
498 break;
499 case Opt_read_from_replica_localize:
500 opt->read_from_replica = CEPH_OSD_FLAG_LOCALIZE_READS;
501 break;
502 default:
503 BUG();
504 }
505 break;
506
507 case Opt_osdtimeout:
508 warn_plog(&log, "Ignoring osdtimeout");
509 break;
510 case Opt_osdkeepalivetimeout:
511 /* 0 isn't well defined right now, reject it */
512 if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
513 goto out_of_range;
514 opt->osd_keepalive_timeout =
515 msecs_to_jiffies(result.uint_32 * 1000);
516 break;
517 case Opt_osd_idle_ttl:
518 /* 0 isn't well defined right now, reject it */
519 if (result.uint_32 < 1 || result.uint_32 > INT_MAX / 1000)
520 goto out_of_range;
521 opt->osd_idle_ttl = msecs_to_jiffies(result.uint_32 * 1000);
522 break;
523 case Opt_mount_timeout:
524 /* 0 is "wait forever" (i.e. infinite timeout) */
525 if (result.uint_32 > INT_MAX / 1000)
526 goto out_of_range;
527 opt->mount_timeout = msecs_to_jiffies(result.uint_32 * 1000);
528 break;
529 case Opt_osd_request_timeout:
530 /* 0 is "wait forever" (i.e. infinite timeout) */
531 if (result.uint_32 > INT_MAX / 1000)
532 goto out_of_range;
533 opt->osd_request_timeout =
534 msecs_to_jiffies(result.uint_32 * 1000);
535 break;
536
537 case Opt_share:
538 if (!result.negated)
539 opt->flags &= ~CEPH_OPT_NOSHARE;
540 else
541 opt->flags |= CEPH_OPT_NOSHARE;
542 break;
543 case Opt_crc:
544 if (!result.negated)
545 opt->flags &= ~CEPH_OPT_NOCRC;
546 else
547 opt->flags |= CEPH_OPT_NOCRC;
548 break;
549 case Opt_cephx_require_signatures:
550 if (!result.negated)
551 opt->flags &= ~CEPH_OPT_NOMSGAUTH;
552 else
553 opt->flags |= CEPH_OPT_NOMSGAUTH;
554 break;
555 case Opt_cephx_sign_messages:
556 if (!result.negated)
557 opt->flags &= ~CEPH_OPT_NOMSGSIGN;
558 else
559 opt->flags |= CEPH_OPT_NOMSGSIGN;
560 break;
561 case Opt_tcp_nodelay:
562 if (!result.negated)
563 opt->flags |= CEPH_OPT_TCP_NODELAY;
564 else
565 opt->flags &= ~CEPH_OPT_TCP_NODELAY;
566 break;
567
568 case Opt_abort_on_full:
569 opt->flags |= CEPH_OPT_ABORT_ON_FULL;
570 break;
571
572 default:
573 BUG();
574 }
575
576 return 0;
577
578 out_of_range:
579 return inval_plog(&log, "%s out of range", param->key);
580 }
581 EXPORT_SYMBOL(ceph_parse_param);
582
583 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
584 bool show_all)
585 {
586 struct ceph_options *opt = client->options;
587 size_t pos = m->count;
588 struct rb_node *n;
589
590 if (opt->name) {
591 seq_puts(m, "name=");
592 seq_escape(m, opt->name, ", \t\n\\");
593 seq_putc(m, ',');
594 }
595 if (opt->key)
596 seq_puts(m, "secret=<hidden>,");
597
598 if (!RB_EMPTY_ROOT(&opt->crush_locs)) {
599 seq_puts(m, "crush_location=");
600 for (n = rb_first(&opt->crush_locs); ; ) {
601 struct crush_loc_node *loc =
602 rb_entry(n, struct crush_loc_node, cl_node);
603
604 seq_printf(m, "%s:%s", loc->cl_loc.cl_type_name,
605 loc->cl_loc.cl_name);
606 n = rb_next(n);
607 if (!n)
608 break;
609
610 seq_putc(m, '|');
611 }
612 seq_putc(m, ',');
613 }
614 if (opt->read_from_replica == CEPH_OSD_FLAG_BALANCE_READS) {
615 seq_puts(m, "read_from_replica=balance,");
616 } else if (opt->read_from_replica == CEPH_OSD_FLAG_LOCALIZE_READS) {
617 seq_puts(m, "read_from_replica=localize,");
618 }
619
620 if (opt->flags & CEPH_OPT_FSID)
621 seq_printf(m, "fsid=%pU,", &opt->fsid);
622 if (opt->flags & CEPH_OPT_NOSHARE)
623 seq_puts(m, "noshare,");
624 if (opt->flags & CEPH_OPT_NOCRC)
625 seq_puts(m, "nocrc,");
626 if (opt->flags & CEPH_OPT_NOMSGAUTH)
627 seq_puts(m, "nocephx_require_signatures,");
628 if (opt->flags & CEPH_OPT_NOMSGSIGN)
629 seq_puts(m, "nocephx_sign_messages,");
630 if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
631 seq_puts(m, "notcp_nodelay,");
632 if (show_all && (opt->flags & CEPH_OPT_ABORT_ON_FULL))
633 seq_puts(m, "abort_on_full,");
634
635 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
636 seq_printf(m, "mount_timeout=%d,",
637 jiffies_to_msecs(opt->mount_timeout) / 1000);
638 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
639 seq_printf(m, "osd_idle_ttl=%d,",
640 jiffies_to_msecs(opt->osd_idle_ttl) / 1000);
641 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
642 seq_printf(m, "osdkeepalivetimeout=%d,",
643 jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);
644 if (opt->osd_request_timeout != CEPH_OSD_REQUEST_TIMEOUT_DEFAULT)
645 seq_printf(m, "osd_request_timeout=%d,",
646 jiffies_to_msecs(opt->osd_request_timeout) / 1000);
647
648 /* drop redundant comma */
649 if (m->count != pos)
650 m->count--;
651
652 return 0;
653 }
654 EXPORT_SYMBOL(ceph_print_client_options);
655
656 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client)
657 {
658 return &client->msgr.inst.addr;
659 }
660 EXPORT_SYMBOL(ceph_client_addr);
661
662 u64 ceph_client_gid(struct ceph_client *client)
663 {
664 return client->monc.auth->global_id;
665 }
666 EXPORT_SYMBOL(ceph_client_gid);
667
668 /*
669 * create a fresh client instance
670 */
671 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
672 {
673 struct ceph_client *client;
674 struct ceph_entity_addr *myaddr = NULL;
675 int err;
676
677 err = wait_for_random_bytes();
678 if (err < 0)
679 return ERR_PTR(err);
680
681 client = kzalloc(sizeof(*client), GFP_KERNEL);
682 if (client == NULL)
683 return ERR_PTR(-ENOMEM);
684
685 client->private = private;
686 client->options = opt;
687
688 mutex_init(&client->mount_mutex);
689 init_waitqueue_head(&client->auth_wq);
690 client->auth_err = 0;
691
692 client->extra_mon_dispatch = NULL;
693 client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT;
694 client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT;
695
696 if (!ceph_test_opt(client, NOMSGAUTH))
697 client->required_features |= CEPH_FEATURE_MSG_AUTH;
698
699 /* msgr */
700 if (ceph_test_opt(client, MYIP))
701 myaddr = &client->options->my_addr;
702
703 ceph_messenger_init(&client->msgr, myaddr);
704
705 /* subsystems */
706 err = ceph_monc_init(&client->monc, client);
707 if (err < 0)
708 goto fail;
709 err = ceph_osdc_init(&client->osdc, client);
710 if (err < 0)
711 goto fail_monc;
712
713 return client;
714
715 fail_monc:
716 ceph_monc_stop(&client->monc);
717 fail:
718 ceph_messenger_fini(&client->msgr);
719 kfree(client);
720 return ERR_PTR(err);
721 }
722 EXPORT_SYMBOL(ceph_create_client);
723
724 void ceph_destroy_client(struct ceph_client *client)
725 {
726 dout("destroy_client %p\n", client);
727
728 atomic_set(&client->msgr.stopping, 1);
729
730 /* unmount */
731 ceph_osdc_stop(&client->osdc);
732 ceph_monc_stop(&client->monc);
733 ceph_messenger_fini(&client->msgr);
734
735 ceph_debugfs_client_cleanup(client);
736
737 ceph_destroy_options(client->options);
738
739 kfree(client);
740 dout("destroy_client %p done\n", client);
741 }
742 EXPORT_SYMBOL(ceph_destroy_client);
743
744 void ceph_reset_client_addr(struct ceph_client *client)
745 {
746 ceph_messenger_reset_nonce(&client->msgr);
747 ceph_monc_reopen_session(&client->monc);
748 ceph_osdc_reopen_osds(&client->osdc);
749 }
750 EXPORT_SYMBOL(ceph_reset_client_addr);
751
752 /*
753 * true if we have the mon map (and have thus joined the cluster)
754 */
755 static bool have_mon_and_osd_map(struct ceph_client *client)
756 {
757 return client->monc.monmap && client->monc.monmap->epoch &&
758 client->osdc.osdmap && client->osdc.osdmap->epoch;
759 }
760
761 /*
762 * mount: join the ceph cluster, and open root directory.
763 */
764 int __ceph_open_session(struct ceph_client *client, unsigned long started)
765 {
766 unsigned long timeout = client->options->mount_timeout;
767 long err;
768
769 /* open session, and wait for mon and osd maps */
770 err = ceph_monc_open_session(&client->monc);
771 if (err < 0)
772 return err;
773
774 while (!have_mon_and_osd_map(client)) {
775 if (timeout && time_after_eq(jiffies, started + timeout))
776 return -ETIMEDOUT;
777
778 /* wait */
779 dout("mount waiting for mon_map\n");
780 err = wait_event_interruptible_timeout(client->auth_wq,
781 have_mon_and_osd_map(client) || (client->auth_err < 0),
782 ceph_timeout_jiffies(timeout));
783 if (err < 0)
784 return err;
785 if (client->auth_err < 0)
786 return client->auth_err;
787 }
788
789 pr_info("client%llu fsid %pU\n", ceph_client_gid(client),
790 &client->fsid);
791 ceph_debugfs_client_init(client);
792
793 return 0;
794 }
795 EXPORT_SYMBOL(__ceph_open_session);
796
797 int ceph_open_session(struct ceph_client *client)
798 {
799 int ret;
800 unsigned long started = jiffies; /* note the start time */
801
802 dout("open_session start\n");
803 mutex_lock(&client->mount_mutex);
804
805 ret = __ceph_open_session(client, started);
806
807 mutex_unlock(&client->mount_mutex);
808 return ret;
809 }
810 EXPORT_SYMBOL(ceph_open_session);
811
812 int ceph_wait_for_latest_osdmap(struct ceph_client *client,
813 unsigned long timeout)
814 {
815 u64 newest_epoch;
816 int ret;
817
818 ret = ceph_monc_get_version(&client->monc, "osdmap", &newest_epoch);
819 if (ret)
820 return ret;
821
822 if (client->osdc.osdmap->epoch >= newest_epoch)
823 return 0;
824
825 ceph_osdc_maybe_request_map(&client->osdc);
826 return ceph_monc_wait_osdmap(&client->monc, newest_epoch, timeout);
827 }
828 EXPORT_SYMBOL(ceph_wait_for_latest_osdmap);
829
830 static int __init init_ceph_lib(void)
831 {
832 int ret = 0;
833
834 ceph_debugfs_init();
835
836 ret = ceph_crypto_init();
837 if (ret < 0)
838 goto out_debugfs;
839
840 ret = ceph_msgr_init();
841 if (ret < 0)
842 goto out_crypto;
843
844 ret = ceph_osdc_setup();
845 if (ret < 0)
846 goto out_msgr;
847
848 pr_info("loaded (mon/osd proto %d/%d)\n",
849 CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);
850
851 return 0;
852
853 out_msgr:
854 ceph_msgr_exit();
855 out_crypto:
856 ceph_crypto_shutdown();
857 out_debugfs:
858 ceph_debugfs_cleanup();
859 return ret;
860 }
861
862 static void __exit exit_ceph_lib(void)
863 {
864 dout("exit_ceph_lib\n");
865 WARN_ON(!ceph_strings_empty());
866
867 ceph_osdc_cleanup();
868 ceph_msgr_exit();
869 ceph_crypto_shutdown();
870 ceph_debugfs_cleanup();
871 }
872
873 module_init(init_ceph_lib);
874 module_exit(exit_ceph_lib);
875
876 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
877 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
878 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
879 MODULE_DESCRIPTION("Ceph core library");
880 MODULE_LICENSE("GPL");
Linux with added FPC-III support