blob: dbb3e1f30c68e25ea5a7905ffeb552fd8954cb81 [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>
Jeff Layton59766872013-02-04 12:50:00 -05009#include <linux/sunrpc/addr.h>
Bryan Schumaker428360d2012-07-16 16:39:17 -040010#include <linux/sunrpc/auth.h>
11#include <linux/sunrpc/xprt.h>
12#include <linux/sunrpc/bc_xprt.h>
Jeff Layton6aa23d72013-11-14 07:25:19 -050013#include <linux/sunrpc/rpc_pipe_fs.h>
Bryan Schumaker428360d2012-07-16 16:39:17 -040014#include "internal.h"
15#include "callback.h"
Bryan Schumakerfcf10392012-07-16 16:39:18 -040016#include "delegation.h"
Trond Myklebust73e39aa2012-11-26 12:49:34 -050017#include "nfs4session.h"
Bryan Schumakerfcf10392012-07-16 16:39:18 -040018#include "pnfs.h"
19#include "netns.h"
Bryan Schumaker428360d2012-07-16 16:39:17 -040020
21#define NFSDBG_FACILITY NFSDBG_CLIENT
22
23/*
Bryan Schumakerec409892012-07-16 16:39:21 -040024 * Get a unique NFSv4.0 callback identifier which will be used
25 * by the V4.0 callback service to lookup the nfs_client struct
26 */
27static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
28{
29 int ret = 0;
30 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
31
32 if (clp->rpc_ops->version != 4 || minorversion != 0)
33 return ret;
Tejun Heod6870312013-02-27 17:05:01 -080034 idr_preload(GFP_KERNEL);
Bryan Schumakerec409892012-07-16 16:39:21 -040035 spin_lock(&nn->nfs_client_lock);
Tejun Heod6870312013-02-27 17:05:01 -080036 ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
37 if (ret >= 0)
38 clp->cl_cb_ident = ret;
Bryan Schumakerec409892012-07-16 16:39:21 -040039 spin_unlock(&nn->nfs_client_lock);
Tejun Heod6870312013-02-27 17:05:01 -080040 idr_preload_end();
41 return ret < 0 ? ret : 0;
Bryan Schumakerec409892012-07-16 16:39:21 -040042}
43
44#ifdef CONFIG_NFS_V4_1
Andy Adamson0e201622013-09-06 14:14:00 -040045/**
46 * Per auth flavor data server rpc clients
47 */
48struct nfs4_ds_server {
49 struct list_head list; /* ds_clp->cl_ds_clients */
50 struct rpc_clnt *rpc_clnt;
51};
52
53/**
54 * Common lookup case for DS I/O
55 */
56static struct nfs4_ds_server *
57nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
58{
59 struct nfs4_ds_server *dss;
60
61 rcu_read_lock();
62 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
63 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
64 continue;
65 goto out;
66 }
67 dss = NULL;
68out:
69 rcu_read_unlock();
70 return dss;
71}
72
73static struct nfs4_ds_server *
74nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
75 struct nfs4_ds_server *new)
76{
77 struct nfs4_ds_server *dss;
78
79 spin_lock(&ds_clp->cl_lock);
80 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
81 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
82 continue;
83 goto out;
84 }
85 if (new)
86 list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
87 dss = new;
88out:
89 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
90 return dss;
91}
92
93static struct nfs4_ds_server *
94nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
95{
96 struct nfs4_ds_server *dss;
97
98 dss = kmalloc(sizeof(*dss), GFP_NOFS);
99 if (dss == NULL)
100 return ERR_PTR(-ENOMEM);
101
102 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
103 if (IS_ERR(dss->rpc_clnt)) {
104 int err = PTR_ERR(dss->rpc_clnt);
105 kfree (dss);
106 return ERR_PTR(err);
107 }
108 INIT_LIST_HEAD(&dss->list);
109
110 return dss;
111}
112
113static void
114nfs4_free_ds_server(struct nfs4_ds_server *dss)
115{
116 rpc_release_client(dss->rpc_clnt);
117 kfree(dss);
118}
119
120/**
121* Find or create a DS rpc client with th MDS server rpc client auth flavor
122* in the nfs_client cl_ds_clients list.
123*/
124struct rpc_clnt *
125nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
126{
127 struct nfs4_ds_server *dss, *new;
128 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
129
130 dss = nfs4_find_ds_client(ds_clp, flavor);
131 if (dss != NULL)
132 goto out;
133 new = nfs4_alloc_ds_server(ds_clp, flavor);
134 if (IS_ERR(new))
135 return ERR_CAST(new);
136 dss = nfs4_add_ds_client(ds_clp, flavor, new);
137 if (dss != new)
138 nfs4_free_ds_server(new);
139out:
140 return dss->rpc_clnt;
141}
142EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
143
144static void
145nfs4_shutdown_ds_clients(struct nfs_client *clp)
146{
147 struct nfs4_ds_server *dss;
148 LIST_HEAD(shutdown_list);
149
150 while (!list_empty(&clp->cl_ds_clients)) {
151 dss = list_entry(clp->cl_ds_clients.next,
152 struct nfs4_ds_server, list);
153 list_del(&dss->list);
154 rpc_shutdown_client(dss->rpc_clnt);
155 kfree (dss);
156 }
157}
158
Chuck Leverabf79bb2013-08-09 12:49:11 -0400159void nfs41_shutdown_client(struct nfs_client *clp)
Bryan Schumakerec409892012-07-16 16:39:21 -0400160{
161 if (nfs4_has_session(clp)) {
Andy Adamson0e201622013-09-06 14:14:00 -0400162 nfs4_shutdown_ds_clients(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400163 nfs4_destroy_session(clp->cl_session);
164 nfs4_destroy_clientid(clp);
165 }
166
167}
Chuck Leverabf79bb2013-08-09 12:49:11 -0400168#endif /* CONFIG_NFS_V4_1 */
169
170void nfs40_shutdown_client(struct nfs_client *clp)
Bryan Schumakerec409892012-07-16 16:39:21 -0400171{
Chuck Leverabf79bb2013-08-09 12:49:11 -0400172 if (clp->cl_slot_tbl) {
173 nfs4_release_slot_table(clp->cl_slot_tbl);
174 kfree(clp->cl_slot_tbl);
175 }
Bryan Schumakerec409892012-07-16 16:39:21 -0400176}
Bryan Schumakerec409892012-07-16 16:39:21 -0400177
178struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
179{
180 int err;
181 struct nfs_client *clp = nfs_alloc_client(cl_init);
182 if (IS_ERR(clp))
183 return clp;
184
185 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
186 if (err)
187 goto error;
188
Steve Dickson42c2c422013-05-22 12:50:38 -0400189 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
190 err = -EINVAL;
191 goto error;
192 }
193
Bryan Schumakerec409892012-07-16 16:39:21 -0400194 spin_lock_init(&clp->cl_lock);
195 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
Andy Adamson0e201622013-09-06 14:14:00 -0400196 INIT_LIST_HEAD(&clp->cl_ds_clients);
Bryan Schumakerec409892012-07-16 16:39:21 -0400197 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
198 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
199 clp->cl_minorversion = cl_init->minorversion;
200 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
Chuck Leverc9fdeb22013-10-17 14:13:02 -0400201 clp->cl_mig_gen = 1;
Bryan Schumakerec409892012-07-16 16:39:21 -0400202 return clp;
203
204error:
Trond Myklebust7653f6f2012-08-20 12:12:29 -0400205 nfs_free_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400206 return ERR_PTR(err);
207}
208
209/*
210 * Destroy the NFS4 callback service
211 */
212static void nfs4_destroy_callback(struct nfs_client *clp)
213{
214 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
Stanislav Kinsburskyc9465562012-08-20 18:00:16 +0400215 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
Bryan Schumakerec409892012-07-16 16:39:21 -0400216}
217
218static void nfs4_shutdown_client(struct nfs_client *clp)
219{
220 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
221 nfs4_kill_renewd(clp);
Chuck Leverabf79bb2013-08-09 12:49:11 -0400222 clp->cl_mvops->shutdown_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400223 nfs4_destroy_callback(clp);
224 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
225 nfs_idmap_delete(clp);
226
227 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
228 kfree(clp->cl_serverowner);
229 kfree(clp->cl_serverscope);
230 kfree(clp->cl_implid);
231}
232
233void nfs4_free_client(struct nfs_client *clp)
234{
235 nfs4_shutdown_client(clp);
236 nfs_free_client(clp);
237}
238
239/*
Bryan Schumaker428360d2012-07-16 16:39:17 -0400240 * Initialize the NFS4 callback service
241 */
242static int nfs4_init_callback(struct nfs_client *clp)
243{
244 int error;
245
246 if (clp->rpc_ops->version == 4) {
247 struct rpc_xprt *xprt;
248
249 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
250
251 if (nfs4_has_session(clp)) {
252 error = xprt_setup_backchannel(xprt,
253 NFS41_BC_MIN_CALLBACKS);
254 if (error < 0)
255 return error;
256 }
257
258 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
259 if (error < 0) {
260 dprintk("%s: failed to start callback. Error = %d\n",
261 __func__, error);
262 return error;
263 }
264 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
265 }
266 return 0;
267}
268
Chuck Leverabf79bb2013-08-09 12:49:11 -0400269/**
270 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
271 * @clp - nfs_client to initialize
272 *
273 * Returns zero on success, or a negative errno if some error occurred.
274 */
275int nfs40_init_client(struct nfs_client *clp)
276{
277 struct nfs4_slot_table *tbl;
278 int ret;
279
280 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
281 if (tbl == NULL)
282 return -ENOMEM;
283
284 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
285 "NFSv4.0 transport Slot table");
286 if (ret) {
287 kfree(tbl);
288 return ret;
289 }
290
291 clp->cl_slot_tbl = tbl;
292 return 0;
293}
294
295#if defined(CONFIG_NFS_V4_1)
296
297/**
298 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
299 * @clp - nfs_client to initialize
300 *
301 * Returns zero on success, or a negative errno if some error occurred.
302 */
303int nfs41_init_client(struct nfs_client *clp)
304{
305 struct nfs4_session *session = NULL;
306
307 /*
308 * Create the session and mark it expired.
309 * When a SEQUENCE operation encounters the expired session
310 * it will do session recovery to initialize it.
311 */
312 session = nfs4_alloc_session(clp);
313 if (!session)
314 return -ENOMEM;
315
316 clp->cl_session = session;
317
318 /*
319 * The create session reply races with the server back
320 * channel probe. Mark the client NFS_CS_SESSION_INITING
321 * so that the client back channel can find the
322 * nfs_client struct
323 */
324 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
325 return 0;
326}
327
328#endif /* CONFIG_NFS_V4_1 */
329
Bryan Schumaker428360d2012-07-16 16:39:17 -0400330/*
331 * Initialize the minor version specific parts of an NFS4 client record
332 */
333static int nfs4_init_client_minor_version(struct nfs_client *clp)
334{
Chuck Leverabf79bb2013-08-09 12:49:11 -0400335 int ret;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400336
Chuck Leverabf79bb2013-08-09 12:49:11 -0400337 ret = clp->cl_mvops->init_client(clp);
338 if (ret)
339 return ret;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400340 return nfs4_init_callback(clp);
341}
342
343/**
344 * nfs4_init_client - Initialise an NFS4 client record
345 *
346 * @clp: nfs_client to initialise
347 * @timeparms: timeout parameters for underlying RPC transport
348 * @ip_addr: callback IP address in presentation format
349 * @authflavor: authentication flavor for underlying RPC transport
350 *
351 * Returns pointer to an NFS client, or an ERR_PTR value.
352 */
353struct nfs_client *nfs4_init_client(struct nfs_client *clp,
354 const struct rpc_timeout *timeparms,
Andy Adamsonf8407292013-07-24 11:59:49 -0400355 const char *ip_addr)
Bryan Schumaker428360d2012-07-16 16:39:17 -0400356{
357 char buf[INET6_ADDRSTRLEN + 1];
Chuck Lever05f4c352012-09-14 17:24:32 -0400358 struct nfs_client *old;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400359 int error;
360
361 if (clp->cl_cons_state == NFS_CS_READY) {
362 /* the client is initialised already */
363 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
364 return clp;
365 }
366
367 /* Check NFS protocol revision and initialize RPC op vector */
368 clp->rpc_ops = &nfs_v4_clientops;
369
Trond Myklebust98f98cf2013-04-14 11:49:51 -0400370 if (clp->cl_minorversion != 0)
371 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400372 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
Trond Myklebust99875242013-09-24 12:06:07 -0400373 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
Jeff Layton6aa23d72013-11-14 07:25:19 -0500374
Jeff Layton0ea9de02014-01-27 14:53:27 -0500375 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
Trond Myklebust23631222013-04-04 16:14:11 -0400376 if (error == -EINVAL)
Chuck Lever83c168b2013-05-15 22:00:10 -0400377 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400378 if (error < 0)
379 goto error;
380
381 /* If no clientaddr= option was specified, find a usable cb address */
382 if (ip_addr == NULL) {
383 struct sockaddr_storage cb_addr;
384 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
385
386 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
387 if (error < 0)
388 goto error;
389 error = rpc_ntop(sap, buf, sizeof(buf));
390 if (error < 0)
391 goto error;
392 ip_addr = (const char *)buf;
393 }
394 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
395
396 error = nfs_idmap_new(clp);
397 if (error < 0) {
398 dprintk("%s: failed to create idmapper. Error = %d\n",
399 __func__, error);
400 goto error;
401 }
402 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
403
404 error = nfs4_init_client_minor_version(clp);
405 if (error < 0)
406 goto error;
407
408 if (!nfs4_has_session(clp))
409 nfs_mark_client_ready(clp, NFS_CS_READY);
Chuck Lever05f4c352012-09-14 17:24:32 -0400410
411 error = nfs4_discover_server_trunking(clp, &old);
412 if (error < 0)
413 goto error;
Chuck Lever05f4c352012-09-14 17:24:32 -0400414
Weston Andros Adamsonabad2fa2014-01-19 22:45:36 -0500415 if (clp != old)
416 clp->cl_preserve_clid = true;
417 nfs_put_client(clp);
418 return old;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400419
420error:
421 nfs_mark_client_ready(clp, error);
422 nfs_put_client(clp);
423 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
424 return ERR_PTR(error);
425}
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400426
Chuck Lever05f4c352012-09-14 17:24:32 -0400427/*
Chuck Lever05f4c352012-09-14 17:24:32 -0400428 * SETCLIENTID just did a callback update with the callback ident in
429 * "drop," but server trunking discovery claims "drop" and "keep" are
430 * actually the same server. Swap the callback IDs so that "keep"
431 * will continue to use the callback ident the server now knows about,
432 * and so that "keep"'s original callback ident is destroyed when
433 * "drop" is freed.
434 */
435static void nfs4_swap_callback_idents(struct nfs_client *keep,
436 struct nfs_client *drop)
437{
438 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
439 unsigned int save = keep->cl_cb_ident;
440
441 if (keep->cl_cb_ident == drop->cl_cb_ident)
442 return;
443
444 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
445 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
446
447 spin_lock(&nn->nfs_client_lock);
448
449 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
450 keep->cl_cb_ident = drop->cl_cb_ident;
451
452 idr_replace(&nn->cb_ident_idr, drop, save);
453 drop->cl_cb_ident = save;
454
455 spin_unlock(&nn->nfs_client_lock);
456}
457
458/**
459 * nfs40_walk_client_list - Find server that recognizes a client ID
460 *
461 * @new: nfs_client with client ID to test
462 * @result: OUT: found nfs_client, or new
463 * @cred: credential to use for trunking test
464 *
465 * Returns zero, a negative errno, or a negative NFS4ERR status.
466 * If zero is returned, an nfs_client pointer is planted in "result."
467 *
468 * NB: nfs40_walk_client_list() relies on the new nfs_client being
469 * the last nfs_client on the list.
470 */
471int nfs40_walk_client_list(struct nfs_client *new,
472 struct nfs_client **result,
473 struct rpc_cred *cred)
474{
475 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400476 struct nfs_client *pos, *prev = NULL;
Chuck Lever05f4c352012-09-14 17:24:32 -0400477 struct nfs4_setclientid_res clid = {
478 .clientid = new->cl_clientid,
479 .confirm = new->cl_confirm,
480 };
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500481 int status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400482
483 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400484 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400485 /* If "pos" isn't marked ready, we can't trust the
486 * remaining fields in "pos" */
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400487 if (pos->cl_cons_state > NFS_CS_READY) {
488 atomic_inc(&pos->cl_count);
489 spin_unlock(&nn->nfs_client_lock);
490
491 if (prev)
492 nfs_put_client(prev);
493 prev = pos;
494
495 status = nfs_wait_client_init_complete(pos);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400496 if (status < 0)
Trond Myklebust64590da2014-01-17 17:03:41 -0500497 goto out;
498 status = -NFS4ERR_STALE_CLIENTID;
499 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400500 }
501 if (pos->cl_cons_state != NFS_CS_READY)
Chuck Lever05f4c352012-09-14 17:24:32 -0400502 continue;
503
504 if (pos->rpc_ops != new->rpc_ops)
505 continue;
506
507 if (pos->cl_proto != new->cl_proto)
508 continue;
509
510 if (pos->cl_minorversion != new->cl_minorversion)
511 continue;
512
513 if (pos->cl_clientid != new->cl_clientid)
514 continue;
515
516 atomic_inc(&pos->cl_count);
517 spin_unlock(&nn->nfs_client_lock);
518
519 if (prev)
520 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500521 prev = pos;
Chuck Lever05f4c352012-09-14 17:24:32 -0400522
523 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500524 switch (status) {
525 case -NFS4ERR_STALE_CLIENTID:
526 break;
527 case 0:
Chuck Lever05f4c352012-09-14 17:24:32 -0400528 nfs4_swap_callback_idents(pos, new);
529
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500530 prev = NULL;
Chuck Lever05f4c352012-09-14 17:24:32 -0400531 *result = pos;
532 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
533 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500534 default:
535 goto out;
Chuck Lever05f4c352012-09-14 17:24:32 -0400536 }
537
538 spin_lock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400539 }
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500540 spin_unlock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400541
Trond Myklebust202c3122013-01-18 22:56:23 -0500542 /* No match found. The server lost our clientid */
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500543out:
Chuck Lever05f4c352012-09-14 17:24:32 -0400544 if (prev)
545 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500546 dprintk("NFS: <-- %s status = %d\n", __func__, status);
547 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400548}
549
550#ifdef CONFIG_NFS_V4_1
551/*
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700552 * Returns true if the client IDs match
553 */
554static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
555{
556 if (a->cl_clientid != b->cl_clientid) {
557 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
558 __func__, a->cl_clientid, b->cl_clientid);
559 return false;
560 }
561 dprintk("NFS: --> %s client ID %llx matches %llx\n",
562 __func__, a->cl_clientid, b->cl_clientid);
563 return true;
564}
565
566/*
Chuck Lever05f4c352012-09-14 17:24:32 -0400567 * Returns true if the server owners match
568 */
569static bool
570nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
571{
572 struct nfs41_server_owner *o1 = a->cl_serverowner;
573 struct nfs41_server_owner *o2 = b->cl_serverowner;
574
575 if (o1->minor_id != o2->minor_id) {
576 dprintk("NFS: --> %s server owner minor IDs do not match\n",
577 __func__);
578 return false;
579 }
580
581 if (o1->major_id_sz != o2->major_id_sz)
582 goto out_major_mismatch;
583 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
584 goto out_major_mismatch;
585
586 dprintk("NFS: --> %s server owners match\n", __func__);
587 return true;
588
589out_major_mismatch:
590 dprintk("NFS: --> %s server owner major IDs do not match\n",
591 __func__);
592 return false;
593}
594
595/**
596 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
597 *
598 * @new: nfs_client with client ID to test
599 * @result: OUT: found nfs_client, or new
600 * @cred: credential to use for trunking test
601 *
602 * Returns zero, a negative errno, or a negative NFS4ERR status.
603 * If zero is returned, an nfs_client pointer is planted in "result."
604 *
605 * NB: nfs41_walk_client_list() relies on the new nfs_client being
606 * the last nfs_client on the list.
607 */
608int nfs41_walk_client_list(struct nfs_client *new,
609 struct nfs_client **result,
610 struct rpc_cred *cred)
611{
612 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400613 struct nfs_client *pos, *prev = NULL;
Trond Myklebust202c3122013-01-18 22:56:23 -0500614 int status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400615
616 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400617 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400618 /* If "pos" isn't marked ready, we can't trust the
619 * remaining fields in "pos", especially the client
620 * ID and serverowner fields. Wait for CREATE_SESSION
621 * to finish. */
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400622 if (pos->cl_cons_state > NFS_CS_READY) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400623 atomic_inc(&pos->cl_count);
624 spin_unlock(&nn->nfs_client_lock);
625
626 if (prev)
627 nfs_put_client(prev);
628 prev = pos;
629
Trond Myklebust202c3122013-01-18 22:56:23 -0500630 status = nfs_wait_client_init_complete(pos);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400631 if (status == 0) {
632 nfs4_schedule_lease_recovery(pos);
633 status = nfs4_wait_clnt_recover(pos);
Chuck Lever05f4c352012-09-14 17:24:32 -0400634 }
Chuck Lever05f4c352012-09-14 17:24:32 -0400635 spin_lock(&nn->nfs_client_lock);
Trond Myklebust65436ec2013-01-18 23:01:43 -0500636 if (status < 0)
Trond Myklebust64590da2014-01-17 17:03:41 -0500637 break;
638 status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400639 }
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400640 if (pos->cl_cons_state != NFS_CS_READY)
641 continue;
Chuck Lever05f4c352012-09-14 17:24:32 -0400642
643 if (pos->rpc_ops != new->rpc_ops)
644 continue;
645
646 if (pos->cl_proto != new->cl_proto)
647 continue;
648
649 if (pos->cl_minorversion != new->cl_minorversion)
650 continue;
651
652 if (!nfs4_match_clientids(pos, new))
653 continue;
654
655 if (!nfs4_match_serverowners(pos, new))
656 continue;
657
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500658 atomic_inc(&pos->cl_count);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400659 *result = pos;
Trond Myklebusteb04e0a2013-04-10 12:44:18 -0400660 status = 0;
Chuck Lever05f4c352012-09-14 17:24:32 -0400661 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
662 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400663 break;
Chuck Lever05f4c352012-09-14 17:24:32 -0400664 }
665
Trond Myklebust202c3122013-01-18 22:56:23 -0500666 /* No matching nfs_client found. */
Chuck Lever05f4c352012-09-14 17:24:32 -0400667 spin_unlock(&nn->nfs_client_lock);
Trond Myklebust202c3122013-01-18 22:56:23 -0500668 dprintk("NFS: <-- %s status = %d\n", __func__, status);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400669 if (prev)
670 nfs_put_client(prev);
Trond Myklebust202c3122013-01-18 22:56:23 -0500671 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400672}
673#endif /* CONFIG_NFS_V4_1 */
674
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400675static void nfs4_destroy_server(struct nfs_server *server)
676{
677 nfs_server_return_all_delegations(server);
678 unset_pnfs_layoutdriver(server);
679 nfs4_purge_state_owners(server);
680}
681
682/*
683 * NFSv4.0 callback thread helper
684 *
685 * Find a client by callback identifier
686 */
687struct nfs_client *
688nfs4_find_client_ident(struct net *net, int cb_ident)
689{
690 struct nfs_client *clp;
691 struct nfs_net *nn = net_generic(net, nfs_net_id);
692
693 spin_lock(&nn->nfs_client_lock);
694 clp = idr_find(&nn->cb_ident_idr, cb_ident);
695 if (clp)
696 atomic_inc(&clp->cl_count);
697 spin_unlock(&nn->nfs_client_lock);
698 return clp;
699}
700
701#if defined(CONFIG_NFS_V4_1)
702/* Common match routine for v4.0 and v4.1 callback services */
703static bool nfs4_cb_match_client(const struct sockaddr *addr,
704 struct nfs_client *clp, u32 minorversion)
705{
706 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
707
708 /* Don't match clients that failed to initialise */
709 if (!(clp->cl_cons_state == NFS_CS_READY ||
710 clp->cl_cons_state == NFS_CS_SESSION_INITING))
711 return false;
712
713 smp_rmb();
714
715 /* Match the version and minorversion */
716 if (clp->rpc_ops->version != 4 ||
717 clp->cl_minorversion != minorversion)
718 return false;
719
720 /* Match only the IP address, not the port number */
721 if (!nfs_sockaddr_match_ipaddr(addr, clap))
722 return false;
723
724 return true;
725}
726
727/*
728 * NFSv4.1 callback thread helper
729 * For CB_COMPOUND calls, find a client by IP address, protocol version,
730 * minorversion, and sessionID
731 *
732 * Returns NULL if no such client
733 */
734struct nfs_client *
735nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400736 struct nfs4_sessionid *sid, u32 minorversion)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400737{
738 struct nfs_client *clp;
739 struct nfs_net *nn = net_generic(net, nfs_net_id);
740
741 spin_lock(&nn->nfs_client_lock);
742 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400743 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400744 continue;
745
746 if (!nfs4_has_session(clp))
747 continue;
748
749 /* Match sessionid*/
750 if (memcmp(clp->cl_session->sess_id.data,
751 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
752 continue;
753
754 atomic_inc(&clp->cl_count);
755 spin_unlock(&nn->nfs_client_lock);
756 return clp;
757 }
758 spin_unlock(&nn->nfs_client_lock);
759 return NULL;
760}
761
762#else /* CONFIG_NFS_V4_1 */
763
764struct nfs_client *
765nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400766 struct nfs4_sessionid *sid, u32 minorversion)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400767{
768 return NULL;
769}
770#endif /* CONFIG_NFS_V4_1 */
771
772/*
773 * Set up an NFS4 client
774 */
775static int nfs4_set_client(struct nfs_server *server,
776 const char *hostname,
777 const struct sockaddr *addr,
778 const size_t addrlen,
779 const char *ip_addr,
780 rpc_authflavor_t authflavour,
781 int proto, const struct rpc_timeout *timeparms,
782 u32 minorversion, struct net *net)
783{
784 struct nfs_client_initdata cl_init = {
785 .hostname = hostname,
786 .addr = addr,
787 .addrlen = addrlen,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400788 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400789 .proto = proto,
790 .minorversion = minorversion,
791 .net = net,
792 };
793 struct nfs_client *clp;
794 int error;
795
796 dprintk("--> nfs4_set_client()\n");
797
798 if (server->flags & NFS_MOUNT_NORESVPORT)
799 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
Chuck Leverf112bb42013-06-25 12:23:27 -0400800 if (server->options & NFS_OPTION_MIGRATION)
801 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400802
803 /* Allocate or find a client reference we can use */
804 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
805 if (IS_ERR(clp)) {
806 error = PTR_ERR(clp);
807 goto error;
808 }
809
810 /*
811 * Query for the lease time on clientid setup or renewal
812 *
813 * Note that this will be set on nfs_clients that were created
814 * only for the DS role and did not set this bit, but now will
815 * serve a dual role.
816 */
817 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
818
819 server->nfs_client = clp;
820 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
821 return 0;
822error:
823 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
824 return error;
825}
826
827/*
828 * Set up a pNFS Data Server client.
829 *
830 * Return any existing nfs_client that matches server address,port,version
831 * and minorversion.
832 *
833 * For a new nfs_client, use a soft mount (default), a low retrans and a
834 * low timeout interval so that if a connection is lost, we retry through
835 * the MDS.
836 */
837struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
838 const struct sockaddr *ds_addr, int ds_addrlen,
839 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
840{
841 struct nfs_client_initdata cl_init = {
842 .addr = ds_addr,
843 .addrlen = ds_addrlen,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400844 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400845 .proto = ds_proto,
846 .minorversion = mds_clp->cl_minorversion,
847 .net = mds_clp->cl_net,
848 };
849 struct rpc_timeout ds_timeout;
850 struct nfs_client *clp;
851
852 /*
853 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
854 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
855 * (section 13.1 RFC 5661).
856 */
857 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
858 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
859 mds_clp->cl_rpcclient->cl_auth->au_flavor);
860
861 dprintk("<-- %s %p\n", __func__, clp);
862 return clp;
863}
864EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
865
866/*
867 * Session has been established, and the client marked ready.
868 * Set the mount rsize and wsize with negotiated fore channel
869 * attributes which will be bound checked in nfs_server_set_fsinfo.
870 */
871static void nfs4_session_set_rwsize(struct nfs_server *server)
872{
873#ifdef CONFIG_NFS_V4_1
874 struct nfs4_session *sess;
875 u32 server_resp_sz;
876 u32 server_rqst_sz;
877
878 if (!nfs4_has_session(server->nfs_client))
879 return;
880 sess = server->nfs_client->cl_session;
881 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
882 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
883
884 if (server->rsize > server_resp_sz)
885 server->rsize = server_resp_sz;
886 if (server->wsize > server_rqst_sz)
887 server->wsize = server_rqst_sz;
888#endif /* CONFIG_NFS_V4_1 */
889}
890
891static int nfs4_server_common_setup(struct nfs_server *server,
Trond Myklebust5e6b1992013-09-07 12:58:57 -0400892 struct nfs_fh *mntfh, bool auth_probe)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400893{
894 struct nfs_fattr *fattr;
895 int error;
896
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400897 /* data servers support only a subset of NFSv4.1 */
898 if (is_ds_only_client(server->nfs_client))
899 return -EPROTONOSUPPORT;
900
901 fattr = nfs_alloc_fattr();
902 if (fattr == NULL)
903 return -ENOMEM;
904
905 /* We must ensure the session is initialised first */
Andy Adamson18aad3d2013-06-26 12:21:49 -0400906 error = nfs4_init_session(server->nfs_client);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400907 if (error < 0)
908 goto out;
909
Trond Myklebust39c6daa2013-03-15 16:11:57 -0400910 /* Set the basic capabilities */
911 server->caps |= server->nfs_client->cl_mvops->init_caps;
912 if (server->flags & NFS_MOUNT_NORDIRPLUS)
913 server->caps &= ~NFS_CAP_READDIRPLUS;
914 /*
915 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
916 * authentication.
917 */
918 if (nfs4_disable_idmapping &&
919 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
920 server->caps |= NFS_CAP_UIDGID_NOMAP;
921
922
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400923 /* Probe the root fh to retrieve its FSID and filehandle */
Trond Myklebust5e6b1992013-09-07 12:58:57 -0400924 error = nfs4_get_rootfh(server, mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400925 if (error < 0)
926 goto out;
927
928 dprintk("Server FSID: %llx:%llx\n",
929 (unsigned long long) server->fsid.major,
930 (unsigned long long) server->fsid.minor);
Chuck Lever9e6ee762013-10-17 14:12:45 -0400931 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400932
933 nfs4_session_set_rwsize(server);
934
935 error = nfs_probe_fsinfo(server, mntfh, fattr);
936 if (error < 0)
937 goto out;
938
939 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
940 server->namelen = NFS4_MAXNAMLEN;
941
942 nfs_server_insert_lists(server);
943 server->mount_time = jiffies;
944 server->destroy = nfs4_destroy_server;
945out:
946 nfs_free_fattr(fattr);
947 return error;
948}
949
950/*
951 * Create a version 4 volume record
952 */
953static int nfs4_init_server(struct nfs_server *server,
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -0400954 struct nfs_parsed_mount_data *data)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400955{
956 struct rpc_timeout timeparms;
957 int error;
958
959 dprintk("--> nfs4_init_server()\n");
960
961 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
962 data->timeo, data->retrans);
963
964 /* Initialise the client representation from the mount data */
965 server->flags = data->flags;
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400966 server->options = data->options;
Weston Andros Adamson0f5f49b2013-10-18 15:15:17 -0400967 server->auth_info = data->auth_info;
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400968
Weston Andros Adamson4d4b69d2013-10-18 15:15:19 -0400969 /* Use the first specified auth flavor. If this flavor isn't
970 * allowed by the server, use the SECINFO path to try the
971 * other specified flavors */
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -0400972 if (data->auth_info.flavor_len >= 1)
973 data->selected_flavor = data->auth_info.flavors[0];
974 else
975 data->selected_flavor = RPC_AUTH_UNIX;
Trond Myklebust5e6b1992013-09-07 12:58:57 -0400976
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400977 /* Get a client record */
978 error = nfs4_set_client(server,
979 data->nfs_server.hostname,
980 (const struct sockaddr *)&data->nfs_server.address,
981 data->nfs_server.addrlen,
982 data->client_address,
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -0400983 data->selected_flavor,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400984 data->nfs_server.protocol,
985 &timeparms,
986 data->minorversion,
987 data->net);
988 if (error < 0)
989 goto error;
990
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400991 if (data->rsize)
992 server->rsize = nfs_block_size(data->rsize, NULL);
993 if (data->wsize)
994 server->wsize = nfs_block_size(data->wsize, NULL);
995
996 server->acregmin = data->acregmin * HZ;
997 server->acregmax = data->acregmax * HZ;
998 server->acdirmin = data->acdirmin * HZ;
999 server->acdirmax = data->acdirmax * HZ;
1000
1001 server->port = data->nfs_server.port;
1002
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001003 error = nfs_init_server_rpcclient(server, &timeparms,
1004 data->selected_flavor);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001005
1006error:
1007 /* Done */
1008 dprintk("<-- nfs4_init_server() = %d\n", error);
1009 return error;
1010}
1011
1012/*
1013 * Create a version 4 volume record
1014 * - keyed on server and FSID
1015 */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001016/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1017 struct nfs_fh *mntfh)*/
1018struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1019 struct nfs_subversion *nfs_mod)
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001020{
1021 struct nfs_server *server;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001022 bool auth_probe;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001023 int error;
1024
1025 dprintk("--> nfs4_create_server()\n");
1026
1027 server = nfs_alloc_server();
1028 if (!server)
1029 return ERR_PTR(-ENOMEM);
1030
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001031 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001032
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001033 /* set up the general RPC client */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001034 error = nfs4_init_server(server, mount_info->parsed);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001035 if (error < 0)
1036 goto error;
1037
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001038 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001039 if (error < 0)
1040 goto error;
1041
1042 dprintk("<-- nfs4_create_server() = %p\n", server);
1043 return server;
1044
1045error:
1046 nfs_free_server(server);
1047 dprintk("<-- nfs4_create_server() = error %d\n", error);
1048 return ERR_PTR(error);
1049}
1050
1051/*
1052 * Create an NFS4 referral server record
1053 */
1054struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1055 struct nfs_fh *mntfh)
1056{
1057 struct nfs_client *parent_client;
1058 struct nfs_server *server, *parent_server;
Weston Andros Adamson5837f6d2013-10-18 15:15:18 -04001059 bool auth_probe;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001060 int error;
1061
1062 dprintk("--> nfs4_create_referral_server()\n");
1063
1064 server = nfs_alloc_server();
1065 if (!server)
1066 return ERR_PTR(-ENOMEM);
1067
1068 parent_server = NFS_SB(data->sb);
1069 parent_client = parent_server->nfs_client;
1070
1071 /* Initialise the client representation from the parent server */
1072 nfs_server_copy_userdata(server, parent_server);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001073
1074 /* Get a client representation.
1075 * Note: NFSv4 always uses TCP, */
1076 error = nfs4_set_client(server, data->hostname,
1077 data->addr,
1078 data->addrlen,
1079 parent_client->cl_ipaddr,
1080 data->authflavor,
1081 rpc_protocol(parent_server->client),
1082 parent_server->client->cl_timeout,
1083 parent_client->cl_mvops->minor_version,
1084 parent_client->cl_net);
1085 if (error < 0)
1086 goto error;
1087
1088 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1089 if (error < 0)
1090 goto error;
1091
Weston Andros Adamson5837f6d2013-10-18 15:15:18 -04001092 auth_probe = parent_server->auth_info.flavor_len < 1;
1093
1094 error = nfs4_server_common_setup(server, mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001095 if (error < 0)
1096 goto error;
1097
1098 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1099 return server;
1100
1101error:
1102 nfs_free_server(server);
1103 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1104 return ERR_PTR(error);
1105}
Chuck Lever32e62b72013-10-17 14:12:28 -04001106
1107/*
1108 * Grab the destination's particulars, including lease expiry time.
1109 *
1110 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1111 * we have cached.
1112 */
1113static int nfs_probe_destination(struct nfs_server *server)
1114{
1115 struct inode *inode = server->super->s_root->d_inode;
1116 struct nfs_fattr *fattr;
1117 int error;
1118
1119 fattr = nfs_alloc_fattr();
1120 if (fattr == NULL)
1121 return -ENOMEM;
1122
1123 /* Sanity: the probe won't work if the destination server
1124 * does not recognize the migrated FH. */
1125 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1126
1127 nfs_free_fattr(fattr);
1128 return error;
1129}
1130
1131/**
1132 * nfs4_update_server - Move an nfs_server to a different nfs_client
1133 *
1134 * @server: represents FSID to be moved
1135 * @hostname: new end-point's hostname
1136 * @sap: new end-point's socket address
1137 * @salen: size of "sap"
1138 *
1139 * The nfs_server must be quiescent before this function is invoked.
1140 * Either its session is drained (NFSv4.1+), or its transport is
1141 * plugged and drained (NFSv4.0).
1142 *
1143 * Returns zero on success, or a negative errno value.
1144 */
1145int nfs4_update_server(struct nfs_server *server, const char *hostname,
1146 struct sockaddr *sap, size_t salen)
1147{
1148 struct nfs_client *clp = server->nfs_client;
1149 struct rpc_clnt *clnt = server->client;
1150 struct xprt_create xargs = {
1151 .ident = clp->cl_proto,
1152 .net = &init_net,
1153 .dstaddr = sap,
1154 .addrlen = salen,
1155 .servername = hostname,
1156 };
1157 char buf[INET6_ADDRSTRLEN + 1];
1158 struct sockaddr_storage address;
1159 struct sockaddr *localaddr = (struct sockaddr *)&address;
1160 int error;
1161
1162 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1163 (unsigned long long)server->fsid.major,
1164 (unsigned long long)server->fsid.minor,
1165 hostname);
1166
1167 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1168 if (error != 0) {
1169 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1170 __func__, error);
1171 goto out;
1172 }
1173
1174 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1175 if (error != 0) {
1176 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1177 __func__, error);
1178 goto out;
1179 }
1180
1181 error = -EAFNOSUPPORT;
1182 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1183 dprintk("<-- %s(): rpc_ntop returned %d\n",
1184 __func__, error);
1185 goto out;
1186 }
1187
1188 nfs_server_remove_lists(server);
1189 error = nfs4_set_client(server, hostname, sap, salen, buf,
1190 clp->cl_rpcclient->cl_auth->au_flavor,
1191 clp->cl_proto, clnt->cl_timeout,
1192 clp->cl_minorversion, clp->cl_net);
1193 nfs_put_client(clp);
1194 if (error != 0) {
1195 nfs_server_insert_lists(server);
1196 dprintk("<-- %s(): nfs4_set_client returned %d\n",
1197 __func__, error);
1198 goto out;
1199 }
1200
1201 if (server->nfs_client->cl_hostname == NULL)
1202 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1203 nfs_server_insert_lists(server);
1204
1205 error = nfs_probe_destination(server);
1206 if (error < 0)
1207 goto out;
1208
1209 dprintk("<-- %s() succeeded\n", __func__);
1210
1211out:
1212 return error;
1213}