blob: 65a290a7306514a74d28201f921794811f85869e [file] [log] [blame]
Bryan Schumaker428360d2012-07-16 16:39:17 -04001/*
2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
3 * Written by David Howells (dhowells@redhat.com)
4 */
Bryan Schumakerfcf10392012-07-16 16:39:18 -04005#include <linux/module.h>
Bryan Schumaker428360d2012-07-16 16:39:17 -04006#include <linux/nfs_fs.h>
7#include <linux/nfs_idmap.h>
Bryan Schumakerfcf10392012-07-16 16:39:18 -04008#include <linux/nfs_mount.h>
Bryan Schumaker428360d2012-07-16 16:39:17 -04009#include <linux/sunrpc/auth.h>
10#include <linux/sunrpc/xprt.h>
11#include <linux/sunrpc/bc_xprt.h>
12#include "internal.h"
13#include "callback.h"
Bryan Schumakerfcf10392012-07-16 16:39:18 -040014#include "delegation.h"
Trond Myklebust73e39aa2012-11-26 12:49:34 -050015#include "nfs4session.h"
Bryan Schumakerfcf10392012-07-16 16:39:18 -040016#include "pnfs.h"
17#include "netns.h"
Bryan Schumaker428360d2012-07-16 16:39:17 -040018
19#define NFSDBG_FACILITY NFSDBG_CLIENT
20
21/*
Bryan Schumakerec409892012-07-16 16:39:21 -040022 * Get a unique NFSv4.0 callback identifier which will be used
23 * by the V4.0 callback service to lookup the nfs_client struct
24 */
25static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
26{
27 int ret = 0;
28 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
29
30 if (clp->rpc_ops->version != 4 || minorversion != 0)
31 return ret;
32retry:
33 if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
34 return -ENOMEM;
35 spin_lock(&nn->nfs_client_lock);
36 ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
37 spin_unlock(&nn->nfs_client_lock);
38 if (ret == -EAGAIN)
39 goto retry;
40 return ret;
41}
42
43#ifdef CONFIG_NFS_V4_1
44static void nfs4_shutdown_session(struct nfs_client *clp)
45{
46 if (nfs4_has_session(clp)) {
47 nfs4_destroy_session(clp->cl_session);
48 nfs4_destroy_clientid(clp);
49 }
50
51}
52#else /* CONFIG_NFS_V4_1 */
53static void nfs4_shutdown_session(struct nfs_client *clp)
54{
55}
56#endif /* CONFIG_NFS_V4_1 */
57
58struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
59{
60 int err;
61 struct nfs_client *clp = nfs_alloc_client(cl_init);
62 if (IS_ERR(clp))
63 return clp;
64
65 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
66 if (err)
67 goto error;
68
69 spin_lock_init(&clp->cl_lock);
70 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
71 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
72 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
73 clp->cl_minorversion = cl_init->minorversion;
74 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
75 return clp;
76
77error:
Trond Myklebust7653f6f2012-08-20 12:12:29 -040078 nfs_free_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -040079 return ERR_PTR(err);
80}
81
82/*
83 * Destroy the NFS4 callback service
84 */
85static void nfs4_destroy_callback(struct nfs_client *clp)
86{
87 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
Stanislav Kinsburskyc9465562012-08-20 18:00:16 +040088 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
Bryan Schumakerec409892012-07-16 16:39:21 -040089}
90
91static void nfs4_shutdown_client(struct nfs_client *clp)
92{
93 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
94 nfs4_kill_renewd(clp);
95 nfs4_shutdown_session(clp);
96 nfs4_destroy_callback(clp);
97 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
98 nfs_idmap_delete(clp);
99
100 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
101 kfree(clp->cl_serverowner);
102 kfree(clp->cl_serverscope);
103 kfree(clp->cl_implid);
104}
105
106void nfs4_free_client(struct nfs_client *clp)
107{
108 nfs4_shutdown_client(clp);
109 nfs_free_client(clp);
110}
111
112/*
Bryan Schumaker428360d2012-07-16 16:39:17 -0400113 * Initialize the NFS4 callback service
114 */
115static int nfs4_init_callback(struct nfs_client *clp)
116{
117 int error;
118
119 if (clp->rpc_ops->version == 4) {
120 struct rpc_xprt *xprt;
121
122 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
123
124 if (nfs4_has_session(clp)) {
125 error = xprt_setup_backchannel(xprt,
126 NFS41_BC_MIN_CALLBACKS);
127 if (error < 0)
128 return error;
129 }
130
131 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
132 if (error < 0) {
133 dprintk("%s: failed to start callback. Error = %d\n",
134 __func__, error);
135 return error;
136 }
137 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
138 }
139 return 0;
140}
141
142/*
143 * Initialize the minor version specific parts of an NFS4 client record
144 */
145static int nfs4_init_client_minor_version(struct nfs_client *clp)
146{
147#if defined(CONFIG_NFS_V4_1)
148 if (clp->cl_mvops->minor_version) {
149 struct nfs4_session *session = NULL;
150 /*
151 * Create the session and mark it expired.
152 * When a SEQUENCE operation encounters the expired session
153 * it will do session recovery to initialize it.
154 */
155 session = nfs4_alloc_session(clp);
156 if (!session)
157 return -ENOMEM;
158
159 clp->cl_session = session;
160 /*
161 * The create session reply races with the server back
162 * channel probe. Mark the client NFS_CS_SESSION_INITING
163 * so that the client back channel can find the
164 * nfs_client struct
165 */
166 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
167 }
168#endif /* CONFIG_NFS_V4_1 */
169
170 return nfs4_init_callback(clp);
171}
172
173/**
174 * nfs4_init_client - Initialise an NFS4 client record
175 *
176 * @clp: nfs_client to initialise
177 * @timeparms: timeout parameters for underlying RPC transport
178 * @ip_addr: callback IP address in presentation format
179 * @authflavor: authentication flavor for underlying RPC transport
180 *
181 * Returns pointer to an NFS client, or an ERR_PTR value.
182 */
183struct nfs_client *nfs4_init_client(struct nfs_client *clp,
184 const struct rpc_timeout *timeparms,
185 const char *ip_addr,
186 rpc_authflavor_t authflavour)
187{
188 char buf[INET6_ADDRSTRLEN + 1];
Chuck Lever05f4c352012-09-14 17:24:32 -0400189 struct nfs_client *old;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400190 int error;
191
192 if (clp->cl_cons_state == NFS_CS_READY) {
193 /* the client is initialised already */
194 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
195 return clp;
196 }
197
198 /* Check NFS protocol revision and initialize RPC op vector */
199 clp->rpc_ops = &nfs_v4_clientops;
200
201 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
202 error = nfs_create_rpc_client(clp, timeparms, authflavour);
203 if (error < 0)
204 goto error;
205
206 /* If no clientaddr= option was specified, find a usable cb address */
207 if (ip_addr == NULL) {
208 struct sockaddr_storage cb_addr;
209 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
210
211 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
212 if (error < 0)
213 goto error;
214 error = rpc_ntop(sap, buf, sizeof(buf));
215 if (error < 0)
216 goto error;
217 ip_addr = (const char *)buf;
218 }
219 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
220
221 error = nfs_idmap_new(clp);
222 if (error < 0) {
223 dprintk("%s: failed to create idmapper. Error = %d\n",
224 __func__, error);
225 goto error;
226 }
227 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
228
229 error = nfs4_init_client_minor_version(clp);
230 if (error < 0)
231 goto error;
232
233 if (!nfs4_has_session(clp))
234 nfs_mark_client_ready(clp, NFS_CS_READY);
Chuck Lever05f4c352012-09-14 17:24:32 -0400235
236 error = nfs4_discover_server_trunking(clp, &old);
237 if (error < 0)
238 goto error;
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500239 nfs_put_client(clp);
Chuck Lever05f4c352012-09-14 17:24:32 -0400240 if (clp != old) {
241 clp->cl_preserve_clid = true;
Chuck Lever05f4c352012-09-14 17:24:32 -0400242 clp = old;
Chuck Lever05f4c352012-09-14 17:24:32 -0400243 }
244
Bryan Schumaker428360d2012-07-16 16:39:17 -0400245 return clp;
246
247error:
248 nfs_mark_client_ready(clp, error);
249 nfs_put_client(clp);
250 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
251 return ERR_PTR(error);
252}
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400253
Chuck Lever05f4c352012-09-14 17:24:32 -0400254/*
Chuck Lever05f4c352012-09-14 17:24:32 -0400255 * SETCLIENTID just did a callback update with the callback ident in
256 * "drop," but server trunking discovery claims "drop" and "keep" are
257 * actually the same server. Swap the callback IDs so that "keep"
258 * will continue to use the callback ident the server now knows about,
259 * and so that "keep"'s original callback ident is destroyed when
260 * "drop" is freed.
261 */
262static void nfs4_swap_callback_idents(struct nfs_client *keep,
263 struct nfs_client *drop)
264{
265 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
266 unsigned int save = keep->cl_cb_ident;
267
268 if (keep->cl_cb_ident == drop->cl_cb_ident)
269 return;
270
271 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
272 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
273
274 spin_lock(&nn->nfs_client_lock);
275
276 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
277 keep->cl_cb_ident = drop->cl_cb_ident;
278
279 idr_replace(&nn->cb_ident_idr, drop, save);
280 drop->cl_cb_ident = save;
281
282 spin_unlock(&nn->nfs_client_lock);
283}
284
285/**
286 * nfs40_walk_client_list - Find server that recognizes a client ID
287 *
288 * @new: nfs_client with client ID to test
289 * @result: OUT: found nfs_client, or new
290 * @cred: credential to use for trunking test
291 *
292 * Returns zero, a negative errno, or a negative NFS4ERR status.
293 * If zero is returned, an nfs_client pointer is planted in "result."
294 *
295 * NB: nfs40_walk_client_list() relies on the new nfs_client being
296 * the last nfs_client on the list.
297 */
298int nfs40_walk_client_list(struct nfs_client *new,
299 struct nfs_client **result,
300 struct rpc_cred *cred)
301{
302 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
303 struct nfs_client *pos, *n, *prev = NULL;
304 struct nfs4_setclientid_res clid = {
305 .clientid = new->cl_clientid,
306 .confirm = new->cl_confirm,
307 };
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500308 int status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400309
310 spin_lock(&nn->nfs_client_lock);
311 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
312 /* If "pos" isn't marked ready, we can't trust the
313 * remaining fields in "pos" */
314 if (pos->cl_cons_state < NFS_CS_READY)
315 continue;
316
317 if (pos->rpc_ops != new->rpc_ops)
318 continue;
319
320 if (pos->cl_proto != new->cl_proto)
321 continue;
322
323 if (pos->cl_minorversion != new->cl_minorversion)
324 continue;
325
326 if (pos->cl_clientid != new->cl_clientid)
327 continue;
328
329 atomic_inc(&pos->cl_count);
330 spin_unlock(&nn->nfs_client_lock);
331
332 if (prev)
333 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500334 prev = pos;
Chuck Lever05f4c352012-09-14 17:24:32 -0400335
336 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500337 switch (status) {
338 case -NFS4ERR_STALE_CLIENTID:
339 break;
340 case 0:
Chuck Lever05f4c352012-09-14 17:24:32 -0400341 nfs4_swap_callback_idents(pos, new);
342
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500343 prev = NULL;
Chuck Lever05f4c352012-09-14 17:24:32 -0400344 *result = pos;
345 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
346 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500347 default:
348 goto out;
Chuck Lever05f4c352012-09-14 17:24:32 -0400349 }
350
351 spin_lock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400352 }
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500353 spin_unlock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400354
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500355out:
Chuck Lever05f4c352012-09-14 17:24:32 -0400356 /*
357 * No matching nfs_client found. This should be impossible,
358 * because the new nfs_client has already been added to
359 * nfs_client_list by nfs_get_client().
360 *
361 * Don't BUG(), since the caller is holding a mutex.
362 */
363 if (prev)
364 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500365 dprintk("NFS: <-- %s status = %d\n", __func__, status);
366 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400367}
368
369#ifdef CONFIG_NFS_V4_1
370/*
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700371 * Returns true if the client IDs match
372 */
373static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
374{
375 if (a->cl_clientid != b->cl_clientid) {
376 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
377 __func__, a->cl_clientid, b->cl_clientid);
378 return false;
379 }
380 dprintk("NFS: --> %s client ID %llx matches %llx\n",
381 __func__, a->cl_clientid, b->cl_clientid);
382 return true;
383}
384
385/*
Chuck Lever05f4c352012-09-14 17:24:32 -0400386 * Returns true if the server owners match
387 */
388static bool
389nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
390{
391 struct nfs41_server_owner *o1 = a->cl_serverowner;
392 struct nfs41_server_owner *o2 = b->cl_serverowner;
393
394 if (o1->minor_id != o2->minor_id) {
395 dprintk("NFS: --> %s server owner minor IDs do not match\n",
396 __func__);
397 return false;
398 }
399
400 if (o1->major_id_sz != o2->major_id_sz)
401 goto out_major_mismatch;
402 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
403 goto out_major_mismatch;
404
405 dprintk("NFS: --> %s server owners match\n", __func__);
406 return true;
407
408out_major_mismatch:
409 dprintk("NFS: --> %s server owner major IDs do not match\n",
410 __func__);
411 return false;
412}
413
414/**
415 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
416 *
417 * @new: nfs_client with client ID to test
418 * @result: OUT: found nfs_client, or new
419 * @cred: credential to use for trunking test
420 *
421 * Returns zero, a negative errno, or a negative NFS4ERR status.
422 * If zero is returned, an nfs_client pointer is planted in "result."
423 *
424 * NB: nfs41_walk_client_list() relies on the new nfs_client being
425 * the last nfs_client on the list.
426 */
427int nfs41_walk_client_list(struct nfs_client *new,
428 struct nfs_client **result,
429 struct rpc_cred *cred)
430{
431 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
432 struct nfs_client *pos, *n, *prev = NULL;
433 int error;
434
435 spin_lock(&nn->nfs_client_lock);
436 list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) {
437 /* If "pos" isn't marked ready, we can't trust the
438 * remaining fields in "pos", especially the client
439 * ID and serverowner fields. Wait for CREATE_SESSION
440 * to finish. */
441 if (pos->cl_cons_state < NFS_CS_READY) {
442 atomic_inc(&pos->cl_count);
443 spin_unlock(&nn->nfs_client_lock);
444
445 if (prev)
446 nfs_put_client(prev);
447 prev = pos;
448
449 error = nfs_wait_client_init_complete(pos);
450 if (error < 0) {
451 nfs_put_client(pos);
Chuck Leverc2ccc082012-10-02 09:18:12 -0700452 spin_lock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400453 continue;
454 }
455
456 spin_lock(&nn->nfs_client_lock);
457 }
458
459 if (pos->rpc_ops != new->rpc_ops)
460 continue;
461
462 if (pos->cl_proto != new->cl_proto)
463 continue;
464
465 if (pos->cl_minorversion != new->cl_minorversion)
466 continue;
467
468 if (!nfs4_match_clientids(pos, new))
469 continue;
470
471 if (!nfs4_match_serverowners(pos, new))
472 continue;
473
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500474 atomic_inc(&pos->cl_count);
Chuck Lever05f4c352012-09-14 17:24:32 -0400475 spin_unlock(&nn->nfs_client_lock);
476 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
477 __func__, pos, atomic_read(&pos->cl_count));
478
479 *result = pos;
480 return 0;
481 }
482
483 /*
484 * No matching nfs_client found. This should be impossible,
485 * because the new nfs_client has already been added to
486 * nfs_client_list by nfs_get_client().
487 *
488 * Don't BUG(), since the caller is holding a mutex.
489 */
490 spin_unlock(&nn->nfs_client_lock);
491 pr_err("NFS: %s Error: no matching nfs_client found\n", __func__);
492 return -NFS4ERR_STALE_CLIENTID;
493}
494#endif /* CONFIG_NFS_V4_1 */
495
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400496static void nfs4_destroy_server(struct nfs_server *server)
497{
498 nfs_server_return_all_delegations(server);
499 unset_pnfs_layoutdriver(server);
500 nfs4_purge_state_owners(server);
501}
502
503/*
504 * NFSv4.0 callback thread helper
505 *
506 * Find a client by callback identifier
507 */
508struct nfs_client *
509nfs4_find_client_ident(struct net *net, int cb_ident)
510{
511 struct nfs_client *clp;
512 struct nfs_net *nn = net_generic(net, nfs_net_id);
513
514 spin_lock(&nn->nfs_client_lock);
515 clp = idr_find(&nn->cb_ident_idr, cb_ident);
516 if (clp)
517 atomic_inc(&clp->cl_count);
518 spin_unlock(&nn->nfs_client_lock);
519 return clp;
520}
521
522#if defined(CONFIG_NFS_V4_1)
523/* Common match routine for v4.0 and v4.1 callback services */
524static bool nfs4_cb_match_client(const struct sockaddr *addr,
525 struct nfs_client *clp, u32 minorversion)
526{
527 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
528
529 /* Don't match clients that failed to initialise */
530 if (!(clp->cl_cons_state == NFS_CS_READY ||
531 clp->cl_cons_state == NFS_CS_SESSION_INITING))
532 return false;
533
534 smp_rmb();
535
536 /* Match the version and minorversion */
537 if (clp->rpc_ops->version != 4 ||
538 clp->cl_minorversion != minorversion)
539 return false;
540
541 /* Match only the IP address, not the port number */
542 if (!nfs_sockaddr_match_ipaddr(addr, clap))
543 return false;
544
545 return true;
546}
547
548/*
549 * NFSv4.1 callback thread helper
550 * For CB_COMPOUND calls, find a client by IP address, protocol version,
551 * minorversion, and sessionID
552 *
553 * Returns NULL if no such client
554 */
555struct nfs_client *
556nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
557 struct nfs4_sessionid *sid)
558{
559 struct nfs_client *clp;
560 struct nfs_net *nn = net_generic(net, nfs_net_id);
561
562 spin_lock(&nn->nfs_client_lock);
563 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
564 if (nfs4_cb_match_client(addr, clp, 1) == false)
565 continue;
566
567 if (!nfs4_has_session(clp))
568 continue;
569
570 /* Match sessionid*/
571 if (memcmp(clp->cl_session->sess_id.data,
572 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
573 continue;
574
575 atomic_inc(&clp->cl_count);
576 spin_unlock(&nn->nfs_client_lock);
577 return clp;
578 }
579 spin_unlock(&nn->nfs_client_lock);
580 return NULL;
581}
582
583#else /* CONFIG_NFS_V4_1 */
584
585struct nfs_client *
586nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
587 struct nfs4_sessionid *sid)
588{
589 return NULL;
590}
591#endif /* CONFIG_NFS_V4_1 */
592
593/*
594 * Set up an NFS4 client
595 */
596static int nfs4_set_client(struct nfs_server *server,
597 const char *hostname,
598 const struct sockaddr *addr,
599 const size_t addrlen,
600 const char *ip_addr,
601 rpc_authflavor_t authflavour,
602 int proto, const struct rpc_timeout *timeparms,
603 u32 minorversion, struct net *net)
604{
605 struct nfs_client_initdata cl_init = {
606 .hostname = hostname,
607 .addr = addr,
608 .addrlen = addrlen,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400609 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400610 .proto = proto,
611 .minorversion = minorversion,
612 .net = net,
613 };
614 struct nfs_client *clp;
615 int error;
616
617 dprintk("--> nfs4_set_client()\n");
618
619 if (server->flags & NFS_MOUNT_NORESVPORT)
620 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
621
622 /* Allocate or find a client reference we can use */
623 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
624 if (IS_ERR(clp)) {
625 error = PTR_ERR(clp);
626 goto error;
627 }
628
629 /*
630 * Query for the lease time on clientid setup or renewal
631 *
632 * Note that this will be set on nfs_clients that were created
633 * only for the DS role and did not set this bit, but now will
634 * serve a dual role.
635 */
636 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
637
638 server->nfs_client = clp;
639 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
640 return 0;
641error:
642 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
643 return error;
644}
645
646/*
647 * Set up a pNFS Data Server client.
648 *
649 * Return any existing nfs_client that matches server address,port,version
650 * and minorversion.
651 *
652 * For a new nfs_client, use a soft mount (default), a low retrans and a
653 * low timeout interval so that if a connection is lost, we retry through
654 * the MDS.
655 */
656struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
657 const struct sockaddr *ds_addr, int ds_addrlen,
658 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
659{
660 struct nfs_client_initdata cl_init = {
661 .addr = ds_addr,
662 .addrlen = ds_addrlen,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400663 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400664 .proto = ds_proto,
665 .minorversion = mds_clp->cl_minorversion,
666 .net = mds_clp->cl_net,
667 };
668 struct rpc_timeout ds_timeout;
669 struct nfs_client *clp;
670
671 /*
672 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
673 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
674 * (section 13.1 RFC 5661).
675 */
676 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
677 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
678 mds_clp->cl_rpcclient->cl_auth->au_flavor);
679
680 dprintk("<-- %s %p\n", __func__, clp);
681 return clp;
682}
683EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
684
685/*
686 * Session has been established, and the client marked ready.
687 * Set the mount rsize and wsize with negotiated fore channel
688 * attributes which will be bound checked in nfs_server_set_fsinfo.
689 */
690static void nfs4_session_set_rwsize(struct nfs_server *server)
691{
692#ifdef CONFIG_NFS_V4_1
693 struct nfs4_session *sess;
694 u32 server_resp_sz;
695 u32 server_rqst_sz;
696
697 if (!nfs4_has_session(server->nfs_client))
698 return;
699 sess = server->nfs_client->cl_session;
700 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
701 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
702
703 if (server->rsize > server_resp_sz)
704 server->rsize = server_resp_sz;
705 if (server->wsize > server_rqst_sz)
706 server->wsize = server_rqst_sz;
707#endif /* CONFIG_NFS_V4_1 */
708}
709
710static int nfs4_server_common_setup(struct nfs_server *server,
711 struct nfs_fh *mntfh)
712{
713 struct nfs_fattr *fattr;
714 int error;
715
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400716 /* data servers support only a subset of NFSv4.1 */
717 if (is_ds_only_client(server->nfs_client))
718 return -EPROTONOSUPPORT;
719
720 fattr = nfs_alloc_fattr();
721 if (fattr == NULL)
722 return -ENOMEM;
723
724 /* We must ensure the session is initialised first */
725 error = nfs4_init_session(server);
726 if (error < 0)
727 goto out;
728
729 /* Probe the root fh to retrieve its FSID and filehandle */
730 error = nfs4_get_rootfh(server, mntfh);
731 if (error < 0)
732 goto out;
733
734 dprintk("Server FSID: %llx:%llx\n",
735 (unsigned long long) server->fsid.major,
736 (unsigned long long) server->fsid.minor);
737 dprintk("Mount FH: %d\n", mntfh->size);
738
739 nfs4_session_set_rwsize(server);
740
741 error = nfs_probe_fsinfo(server, mntfh, fattr);
742 if (error < 0)
743 goto out;
744
745 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
746 server->namelen = NFS4_MAXNAMLEN;
747
748 nfs_server_insert_lists(server);
749 server->mount_time = jiffies;
750 server->destroy = nfs4_destroy_server;
751out:
752 nfs_free_fattr(fattr);
753 return error;
754}
755
756/*
757 * Create a version 4 volume record
758 */
759static int nfs4_init_server(struct nfs_server *server,
760 const struct nfs_parsed_mount_data *data)
761{
762 struct rpc_timeout timeparms;
763 int error;
764
765 dprintk("--> nfs4_init_server()\n");
766
767 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
768 data->timeo, data->retrans);
769
770 /* Initialise the client representation from the mount data */
771 server->flags = data->flags;
772 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK;
773 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
774 server->caps |= NFS_CAP_READDIRPLUS;
775 server->options = data->options;
776
777 /* Get a client record */
778 error = nfs4_set_client(server,
779 data->nfs_server.hostname,
780 (const struct sockaddr *)&data->nfs_server.address,
781 data->nfs_server.addrlen,
782 data->client_address,
783 data->auth_flavors[0],
784 data->nfs_server.protocol,
785 &timeparms,
786 data->minorversion,
787 data->net);
788 if (error < 0)
789 goto error;
790
791 /*
792 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
793 * authentication.
794 */
795 if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX)
796 server->caps |= NFS_CAP_UIDGID_NOMAP;
797
798 if (data->rsize)
799 server->rsize = nfs_block_size(data->rsize, NULL);
800 if (data->wsize)
801 server->wsize = nfs_block_size(data->wsize, NULL);
802
803 server->acregmin = data->acregmin * HZ;
804 server->acregmax = data->acregmax * HZ;
805 server->acdirmin = data->acdirmin * HZ;
806 server->acdirmax = data->acdirmax * HZ;
807
808 server->port = data->nfs_server.port;
809
810 error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
811
812error:
813 /* Done */
814 dprintk("<-- nfs4_init_server() = %d\n", error);
815 return error;
816}
817
818/*
819 * Create a version 4 volume record
820 * - keyed on server and FSID
821 */
Bryan Schumaker1179acc2012-07-30 16:05:19 -0400822/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
823 struct nfs_fh *mntfh)*/
824struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
825 struct nfs_subversion *nfs_mod)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400826{
827 struct nfs_server *server;
828 int error;
829
830 dprintk("--> nfs4_create_server()\n");
831
832 server = nfs_alloc_server();
833 if (!server)
834 return ERR_PTR(-ENOMEM);
835
836 /* set up the general RPC client */
Bryan Schumaker1179acc2012-07-30 16:05:19 -0400837 error = nfs4_init_server(server, mount_info->parsed);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400838 if (error < 0)
839 goto error;
840
Bryan Schumaker1179acc2012-07-30 16:05:19 -0400841 error = nfs4_server_common_setup(server, mount_info->mntfh);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400842 if (error < 0)
843 goto error;
844
845 dprintk("<-- nfs4_create_server() = %p\n", server);
846 return server;
847
848error:
849 nfs_free_server(server);
850 dprintk("<-- nfs4_create_server() = error %d\n", error);
851 return ERR_PTR(error);
852}
853
854/*
855 * Create an NFS4 referral server record
856 */
857struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
858 struct nfs_fh *mntfh)
859{
860 struct nfs_client *parent_client;
861 struct nfs_server *server, *parent_server;
862 int error;
863
864 dprintk("--> nfs4_create_referral_server()\n");
865
866 server = nfs_alloc_server();
867 if (!server)
868 return ERR_PTR(-ENOMEM);
869
870 parent_server = NFS_SB(data->sb);
871 parent_client = parent_server->nfs_client;
872
873 /* Initialise the client representation from the parent server */
874 nfs_server_copy_userdata(server, parent_server);
875 server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR;
876
877 /* Get a client representation.
878 * Note: NFSv4 always uses TCP, */
879 error = nfs4_set_client(server, data->hostname,
880 data->addr,
881 data->addrlen,
882 parent_client->cl_ipaddr,
883 data->authflavor,
884 rpc_protocol(parent_server->client),
885 parent_server->client->cl_timeout,
886 parent_client->cl_mvops->minor_version,
887 parent_client->cl_net);
888 if (error < 0)
889 goto error;
890
891 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
892 if (error < 0)
893 goto error;
894
895 error = nfs4_server_common_setup(server, mntfh);
896 if (error < 0)
897 goto error;
898
899 dprintk("<-- nfs_create_referral_server() = %p\n", server);
900 return server;
901
902error:
903 nfs_free_server(server);
904 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
905 return ERR_PTR(error);
906}