blob: b4a160a405ce2b60f64255433c1555a4284c61e9 [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>
13#include "internal.h"
14#include "callback.h"
Bryan Schumakerfcf10392012-07-16 16:39:18 -040015#include "delegation.h"
Trond Myklebust73e39aa2012-11-26 12:49:34 -050016#include "nfs4session.h"
Bryan Schumakerfcf10392012-07-16 16:39:18 -040017#include "pnfs.h"
18#include "netns.h"
Bryan Schumaker428360d2012-07-16 16:39:17 -040019
20#define NFSDBG_FACILITY NFSDBG_CLIENT
21
22/*
Bryan Schumakerec409892012-07-16 16:39:21 -040023 * Get a unique NFSv4.0 callback identifier which will be used
24 * by the V4.0 callback service to lookup the nfs_client struct
25 */
26static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
27{
28 int ret = 0;
29 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
30
31 if (clp->rpc_ops->version != 4 || minorversion != 0)
32 return ret;
Tejun Heod6870312013-02-27 17:05:01 -080033 idr_preload(GFP_KERNEL);
Bryan Schumakerec409892012-07-16 16:39:21 -040034 spin_lock(&nn->nfs_client_lock);
Tejun Heod6870312013-02-27 17:05:01 -080035 ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
36 if (ret >= 0)
37 clp->cl_cb_ident = ret;
Bryan Schumakerec409892012-07-16 16:39:21 -040038 spin_unlock(&nn->nfs_client_lock);
Tejun Heod6870312013-02-27 17:05:01 -080039 idr_preload_end();
40 return ret < 0 ? ret : 0;
Bryan Schumakerec409892012-07-16 16:39:21 -040041}
42
43#ifdef CONFIG_NFS_V4_1
Andy Adamson0e201622013-09-06 14:14:00 -040044/**
45 * Per auth flavor data server rpc clients
46 */
47struct nfs4_ds_server {
48 struct list_head list; /* ds_clp->cl_ds_clients */
49 struct rpc_clnt *rpc_clnt;
50};
51
52/**
53 * Common lookup case for DS I/O
54 */
55static struct nfs4_ds_server *
56nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
57{
58 struct nfs4_ds_server *dss;
59
60 rcu_read_lock();
61 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
62 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
63 continue;
64 goto out;
65 }
66 dss = NULL;
67out:
68 rcu_read_unlock();
69 return dss;
70}
71
72static struct nfs4_ds_server *
73nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
74 struct nfs4_ds_server *new)
75{
76 struct nfs4_ds_server *dss;
77
78 spin_lock(&ds_clp->cl_lock);
79 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
80 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
81 continue;
82 goto out;
83 }
84 if (new)
85 list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
86 dss = new;
87out:
88 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
89 return dss;
90}
91
92static struct nfs4_ds_server *
93nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
94{
95 struct nfs4_ds_server *dss;
96
97 dss = kmalloc(sizeof(*dss), GFP_NOFS);
98 if (dss == NULL)
99 return ERR_PTR(-ENOMEM);
100
101 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
102 if (IS_ERR(dss->rpc_clnt)) {
103 int err = PTR_ERR(dss->rpc_clnt);
104 kfree (dss);
105 return ERR_PTR(err);
106 }
107 INIT_LIST_HEAD(&dss->list);
108
109 return dss;
110}
111
112static void
113nfs4_free_ds_server(struct nfs4_ds_server *dss)
114{
115 rpc_release_client(dss->rpc_clnt);
116 kfree(dss);
117}
118
119/**
120* Find or create a DS rpc client with th MDS server rpc client auth flavor
121* in the nfs_client cl_ds_clients list.
122*/
123struct rpc_clnt *
124nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
125{
126 struct nfs4_ds_server *dss, *new;
127 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
128
129 dss = nfs4_find_ds_client(ds_clp, flavor);
130 if (dss != NULL)
131 goto out;
132 new = nfs4_alloc_ds_server(ds_clp, flavor);
133 if (IS_ERR(new))
134 return ERR_CAST(new);
135 dss = nfs4_add_ds_client(ds_clp, flavor, new);
136 if (dss != new)
137 nfs4_free_ds_server(new);
138out:
139 return dss->rpc_clnt;
140}
141EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
142
143static void
144nfs4_shutdown_ds_clients(struct nfs_client *clp)
145{
146 struct nfs4_ds_server *dss;
147 LIST_HEAD(shutdown_list);
148
149 while (!list_empty(&clp->cl_ds_clients)) {
150 dss = list_entry(clp->cl_ds_clients.next,
151 struct nfs4_ds_server, list);
152 list_del(&dss->list);
153 rpc_shutdown_client(dss->rpc_clnt);
154 kfree (dss);
155 }
156}
157
Chuck Leverabf79bb2013-08-09 12:49:11 -0400158void nfs41_shutdown_client(struct nfs_client *clp)
Bryan Schumakerec409892012-07-16 16:39:21 -0400159{
160 if (nfs4_has_session(clp)) {
Andy Adamson0e201622013-09-06 14:14:00 -0400161 nfs4_shutdown_ds_clients(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400162 nfs4_destroy_session(clp->cl_session);
163 nfs4_destroy_clientid(clp);
164 }
165
166}
Chuck Leverabf79bb2013-08-09 12:49:11 -0400167#endif /* CONFIG_NFS_V4_1 */
168
169void nfs40_shutdown_client(struct nfs_client *clp)
Bryan Schumakerec409892012-07-16 16:39:21 -0400170{
Chuck Leverabf79bb2013-08-09 12:49:11 -0400171 if (clp->cl_slot_tbl) {
172 nfs4_release_slot_table(clp->cl_slot_tbl);
173 kfree(clp->cl_slot_tbl);
174 }
Bryan Schumakerec409892012-07-16 16:39:21 -0400175}
Bryan Schumakerec409892012-07-16 16:39:21 -0400176
177struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
178{
179 int err;
180 struct nfs_client *clp = nfs_alloc_client(cl_init);
181 if (IS_ERR(clp))
182 return clp;
183
184 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
185 if (err)
186 goto error;
187
Steve Dickson42c2c422013-05-22 12:50:38 -0400188 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
189 err = -EINVAL;
190 goto error;
191 }
192
Bryan Schumakerec409892012-07-16 16:39:21 -0400193 spin_lock_init(&clp->cl_lock);
194 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
Andy Adamson0e201622013-09-06 14:14:00 -0400195 INIT_LIST_HEAD(&clp->cl_ds_clients);
Bryan Schumakerec409892012-07-16 16:39:21 -0400196 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
197 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
198 clp->cl_minorversion = cl_init->minorversion;
199 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
Chuck Leverc9fdeb22013-10-17 14:13:02 -0400200 clp->cl_mig_gen = 1;
Bryan Schumakerec409892012-07-16 16:39:21 -0400201 return clp;
202
203error:
Trond Myklebust7653f6f2012-08-20 12:12:29 -0400204 nfs_free_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400205 return ERR_PTR(err);
206}
207
208/*
209 * Destroy the NFS4 callback service
210 */
211static void nfs4_destroy_callback(struct nfs_client *clp)
212{
213 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
Stanislav Kinsburskyc9465562012-08-20 18:00:16 +0400214 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
Bryan Schumakerec409892012-07-16 16:39:21 -0400215}
216
217static void nfs4_shutdown_client(struct nfs_client *clp)
218{
219 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
220 nfs4_kill_renewd(clp);
Chuck Leverabf79bb2013-08-09 12:49:11 -0400221 clp->cl_mvops->shutdown_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400222 nfs4_destroy_callback(clp);
223 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
224 nfs_idmap_delete(clp);
225
226 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
227 kfree(clp->cl_serverowner);
228 kfree(clp->cl_serverscope);
229 kfree(clp->cl_implid);
230}
231
232void nfs4_free_client(struct nfs_client *clp)
233{
234 nfs4_shutdown_client(clp);
235 nfs_free_client(clp);
236}
237
238/*
Bryan Schumaker428360d2012-07-16 16:39:17 -0400239 * Initialize the NFS4 callback service
240 */
241static int nfs4_init_callback(struct nfs_client *clp)
242{
243 int error;
244
245 if (clp->rpc_ops->version == 4) {
246 struct rpc_xprt *xprt;
247
248 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
249
250 if (nfs4_has_session(clp)) {
251 error = xprt_setup_backchannel(xprt,
252 NFS41_BC_MIN_CALLBACKS);
253 if (error < 0)
254 return error;
255 }
256
257 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
258 if (error < 0) {
259 dprintk("%s: failed to start callback. Error = %d\n",
260 __func__, error);
261 return error;
262 }
263 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
264 }
265 return 0;
266}
267
Chuck Leverabf79bb2013-08-09 12:49:11 -0400268/**
269 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
270 * @clp - nfs_client to initialize
271 *
272 * Returns zero on success, or a negative errno if some error occurred.
273 */
274int nfs40_init_client(struct nfs_client *clp)
275{
276 struct nfs4_slot_table *tbl;
277 int ret;
278
279 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
280 if (tbl == NULL)
281 return -ENOMEM;
282
283 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
284 "NFSv4.0 transport Slot table");
285 if (ret) {
286 kfree(tbl);
287 return ret;
288 }
289
290 clp->cl_slot_tbl = tbl;
291 return 0;
292}
293
294#if defined(CONFIG_NFS_V4_1)
295
296/**
297 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
298 * @clp - nfs_client to initialize
299 *
300 * Returns zero on success, or a negative errno if some error occurred.
301 */
302int nfs41_init_client(struct nfs_client *clp)
303{
304 struct nfs4_session *session = NULL;
305
306 /*
307 * Create the session and mark it expired.
308 * When a SEQUENCE operation encounters the expired session
309 * it will do session recovery to initialize it.
310 */
311 session = nfs4_alloc_session(clp);
312 if (!session)
313 return -ENOMEM;
314
315 clp->cl_session = session;
316
317 /*
318 * The create session reply races with the server back
319 * channel probe. Mark the client NFS_CS_SESSION_INITING
320 * so that the client back channel can find the
321 * nfs_client struct
322 */
323 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
324 return 0;
325}
326
327#endif /* CONFIG_NFS_V4_1 */
328
Bryan Schumaker428360d2012-07-16 16:39:17 -0400329/*
330 * Initialize the minor version specific parts of an NFS4 client record
331 */
332static int nfs4_init_client_minor_version(struct nfs_client *clp)
333{
Chuck Leverabf79bb2013-08-09 12:49:11 -0400334 int ret;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400335
Chuck Leverabf79bb2013-08-09 12:49:11 -0400336 ret = clp->cl_mvops->init_client(clp);
337 if (ret)
338 return ret;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400339 return nfs4_init_callback(clp);
340}
341
342/**
343 * nfs4_init_client - Initialise an NFS4 client record
344 *
345 * @clp: nfs_client to initialise
346 * @timeparms: timeout parameters for underlying RPC transport
347 * @ip_addr: callback IP address in presentation format
348 * @authflavor: authentication flavor for underlying RPC transport
349 *
350 * Returns pointer to an NFS client, or an ERR_PTR value.
351 */
352struct nfs_client *nfs4_init_client(struct nfs_client *clp,
353 const struct rpc_timeout *timeparms,
Andy Adamsonf8407292013-07-24 11:59:49 -0400354 const char *ip_addr)
Bryan Schumaker428360d2012-07-16 16:39:17 -0400355{
356 char buf[INET6_ADDRSTRLEN + 1];
Chuck Lever05f4c352012-09-14 17:24:32 -0400357 struct nfs_client *old;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400358 int error;
359
360 if (clp->cl_cons_state == NFS_CS_READY) {
361 /* the client is initialised already */
362 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
363 return clp;
364 }
365
366 /* Check NFS protocol revision and initialize RPC op vector */
367 clp->rpc_ops = &nfs_v4_clientops;
368
Trond Myklebust98f98cf2013-04-14 11:49:51 -0400369 if (clp->cl_minorversion != 0)
370 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400371 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
Trond Myklebust99875242013-09-24 12:06:07 -0400372 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
Chuck Lever4edaa302013-03-16 15:56:20 -0400373 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
Trond Myklebust23631222013-04-04 16:14:11 -0400374 if (error == -EINVAL)
Chuck Lever83c168b2013-05-15 22:00:10 -0400375 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400376 if (error < 0)
377 goto error;
378
379 /* If no clientaddr= option was specified, find a usable cb address */
380 if (ip_addr == NULL) {
381 struct sockaddr_storage cb_addr;
382 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
383
384 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
385 if (error < 0)
386 goto error;
387 error = rpc_ntop(sap, buf, sizeof(buf));
388 if (error < 0)
389 goto error;
390 ip_addr = (const char *)buf;
391 }
392 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
393
394 error = nfs_idmap_new(clp);
395 if (error < 0) {
396 dprintk("%s: failed to create idmapper. Error = %d\n",
397 __func__, error);
398 goto error;
399 }
400 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
401
402 error = nfs4_init_client_minor_version(clp);
403 if (error < 0)
404 goto error;
405
406 if (!nfs4_has_session(clp))
407 nfs_mark_client_ready(clp, NFS_CS_READY);
Chuck Lever05f4c352012-09-14 17:24:32 -0400408
409 error = nfs4_discover_server_trunking(clp, &old);
410 if (error < 0)
411 goto error;
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500412 nfs_put_client(clp);
Chuck Lever05f4c352012-09-14 17:24:32 -0400413 if (clp != old) {
414 clp->cl_preserve_clid = true;
Chuck Lever05f4c352012-09-14 17:24:32 -0400415 clp = old;
Chuck Lever05f4c352012-09-14 17:24:32 -0400416 }
417
Bryan Schumaker428360d2012-07-16 16:39:17 -0400418 return clp;
419
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);
496 spin_lock(&nn->nfs_client_lock);
497 if (status < 0)
498 continue;
499 }
500 if (pos->cl_cons_state != NFS_CS_READY)
Chuck Lever05f4c352012-09-14 17:24:32 -0400501 continue;
502
503 if (pos->rpc_ops != new->rpc_ops)
504 continue;
505
506 if (pos->cl_proto != new->cl_proto)
507 continue;
508
509 if (pos->cl_minorversion != new->cl_minorversion)
510 continue;
511
512 if (pos->cl_clientid != new->cl_clientid)
513 continue;
514
515 atomic_inc(&pos->cl_count);
516 spin_unlock(&nn->nfs_client_lock);
517
518 if (prev)
519 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500520 prev = pos;
Chuck Lever05f4c352012-09-14 17:24:32 -0400521
522 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500523 switch (status) {
524 case -NFS4ERR_STALE_CLIENTID:
525 break;
526 case 0:
Chuck Lever05f4c352012-09-14 17:24:32 -0400527 nfs4_swap_callback_idents(pos, new);
528
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500529 prev = NULL;
Chuck Lever05f4c352012-09-14 17:24:32 -0400530 *result = pos;
531 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
532 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500533 default:
534 goto out;
Chuck Lever05f4c352012-09-14 17:24:32 -0400535 }
536
537 spin_lock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400538 }
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500539 spin_unlock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400540
Trond Myklebust202c3122013-01-18 22:56:23 -0500541 /* No match found. The server lost our clientid */
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500542out:
Chuck Lever05f4c352012-09-14 17:24:32 -0400543 if (prev)
544 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500545 dprintk("NFS: <-- %s status = %d\n", __func__, status);
546 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400547}
548
549#ifdef CONFIG_NFS_V4_1
550/*
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700551 * Returns true if the client IDs match
552 */
553static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
554{
555 if (a->cl_clientid != b->cl_clientid) {
556 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
557 __func__, a->cl_clientid, b->cl_clientid);
558 return false;
559 }
560 dprintk("NFS: --> %s client ID %llx matches %llx\n",
561 __func__, a->cl_clientid, b->cl_clientid);
562 return true;
563}
564
565/*
Chuck Lever05f4c352012-09-14 17:24:32 -0400566 * Returns true if the server owners match
567 */
568static bool
569nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
570{
571 struct nfs41_server_owner *o1 = a->cl_serverowner;
572 struct nfs41_server_owner *o2 = b->cl_serverowner;
573
574 if (o1->minor_id != o2->minor_id) {
575 dprintk("NFS: --> %s server owner minor IDs do not match\n",
576 __func__);
577 return false;
578 }
579
580 if (o1->major_id_sz != o2->major_id_sz)
581 goto out_major_mismatch;
582 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
583 goto out_major_mismatch;
584
585 dprintk("NFS: --> %s server owners match\n", __func__);
586 return true;
587
588out_major_mismatch:
589 dprintk("NFS: --> %s server owner major IDs do not match\n",
590 __func__);
591 return false;
592}
593
594/**
595 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
596 *
597 * @new: nfs_client with client ID to test
598 * @result: OUT: found nfs_client, or new
599 * @cred: credential to use for trunking test
600 *
601 * Returns zero, a negative errno, or a negative NFS4ERR status.
602 * If zero is returned, an nfs_client pointer is planted in "result."
603 *
604 * NB: nfs41_walk_client_list() relies on the new nfs_client being
605 * the last nfs_client on the list.
606 */
607int nfs41_walk_client_list(struct nfs_client *new,
608 struct nfs_client **result,
609 struct rpc_cred *cred)
610{
611 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400612 struct nfs_client *pos, *prev = NULL;
Trond Myklebust202c3122013-01-18 22:56:23 -0500613 int status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400614
615 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400616 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400617 /* If "pos" isn't marked ready, we can't trust the
618 * remaining fields in "pos", especially the client
619 * ID and serverowner fields. Wait for CREATE_SESSION
620 * to finish. */
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400621 if (pos->cl_cons_state > NFS_CS_READY) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400622 atomic_inc(&pos->cl_count);
623 spin_unlock(&nn->nfs_client_lock);
624
625 if (prev)
626 nfs_put_client(prev);
627 prev = pos;
628
Trond Myklebust202c3122013-01-18 22:56:23 -0500629 status = nfs_wait_client_init_complete(pos);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400630 if (status == 0) {
631 nfs4_schedule_lease_recovery(pos);
632 status = nfs4_wait_clnt_recover(pos);
Chuck Lever05f4c352012-09-14 17:24:32 -0400633 }
Chuck Lever05f4c352012-09-14 17:24:32 -0400634 spin_lock(&nn->nfs_client_lock);
Trond Myklebust65436ec2013-01-18 23:01:43 -0500635 if (status < 0)
636 continue;
Chuck Lever05f4c352012-09-14 17:24:32 -0400637 }
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400638 if (pos->cl_cons_state != NFS_CS_READY)
639 continue;
Chuck Lever05f4c352012-09-14 17:24:32 -0400640
641 if (pos->rpc_ops != new->rpc_ops)
642 continue;
643
644 if (pos->cl_proto != new->cl_proto)
645 continue;
646
647 if (pos->cl_minorversion != new->cl_minorversion)
648 continue;
649
650 if (!nfs4_match_clientids(pos, new))
651 continue;
652
653 if (!nfs4_match_serverowners(pos, new))
654 continue;
655
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500656 atomic_inc(&pos->cl_count);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400657 *result = pos;
Trond Myklebusteb04e0a2013-04-10 12:44:18 -0400658 status = 0;
Chuck Lever05f4c352012-09-14 17:24:32 -0400659 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
660 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400661 break;
Chuck Lever05f4c352012-09-14 17:24:32 -0400662 }
663
Trond Myklebust202c3122013-01-18 22:56:23 -0500664 /* No matching nfs_client found. */
Chuck Lever05f4c352012-09-14 17:24:32 -0400665 spin_unlock(&nn->nfs_client_lock);
Trond Myklebust202c3122013-01-18 22:56:23 -0500666 dprintk("NFS: <-- %s status = %d\n", __func__, status);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400667 if (prev)
668 nfs_put_client(prev);
Trond Myklebust202c3122013-01-18 22:56:23 -0500669 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400670}
671#endif /* CONFIG_NFS_V4_1 */
672
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400673static void nfs4_destroy_server(struct nfs_server *server)
674{
675 nfs_server_return_all_delegations(server);
676 unset_pnfs_layoutdriver(server);
677 nfs4_purge_state_owners(server);
678}
679
680/*
681 * NFSv4.0 callback thread helper
682 *
683 * Find a client by callback identifier
684 */
685struct nfs_client *
686nfs4_find_client_ident(struct net *net, int cb_ident)
687{
688 struct nfs_client *clp;
689 struct nfs_net *nn = net_generic(net, nfs_net_id);
690
691 spin_lock(&nn->nfs_client_lock);
692 clp = idr_find(&nn->cb_ident_idr, cb_ident);
693 if (clp)
694 atomic_inc(&clp->cl_count);
695 spin_unlock(&nn->nfs_client_lock);
696 return clp;
697}
698
699#if defined(CONFIG_NFS_V4_1)
700/* Common match routine for v4.0 and v4.1 callback services */
701static bool nfs4_cb_match_client(const struct sockaddr *addr,
702 struct nfs_client *clp, u32 minorversion)
703{
704 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
705
706 /* Don't match clients that failed to initialise */
707 if (!(clp->cl_cons_state == NFS_CS_READY ||
708 clp->cl_cons_state == NFS_CS_SESSION_INITING))
709 return false;
710
711 smp_rmb();
712
713 /* Match the version and minorversion */
714 if (clp->rpc_ops->version != 4 ||
715 clp->cl_minorversion != minorversion)
716 return false;
717
718 /* Match only the IP address, not the port number */
719 if (!nfs_sockaddr_match_ipaddr(addr, clap))
720 return false;
721
722 return true;
723}
724
725/*
726 * NFSv4.1 callback thread helper
727 * For CB_COMPOUND calls, find a client by IP address, protocol version,
728 * minorversion, and sessionID
729 *
730 * Returns NULL if no such client
731 */
732struct nfs_client *
733nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400734 struct nfs4_sessionid *sid, u32 minorversion)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400735{
736 struct nfs_client *clp;
737 struct nfs_net *nn = net_generic(net, nfs_net_id);
738
739 spin_lock(&nn->nfs_client_lock);
740 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400741 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400742 continue;
743
744 if (!nfs4_has_session(clp))
745 continue;
746
747 /* Match sessionid*/
748 if (memcmp(clp->cl_session->sess_id.data,
749 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
750 continue;
751
752 atomic_inc(&clp->cl_count);
753 spin_unlock(&nn->nfs_client_lock);
754 return clp;
755 }
756 spin_unlock(&nn->nfs_client_lock);
757 return NULL;
758}
759
760#else /* CONFIG_NFS_V4_1 */
761
762struct nfs_client *
763nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400764 struct nfs4_sessionid *sid, u32 minorversion)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400765{
766 return NULL;
767}
768#endif /* CONFIG_NFS_V4_1 */
769
770/*
771 * Set up an NFS4 client
772 */
773static int nfs4_set_client(struct nfs_server *server,
774 const char *hostname,
775 const struct sockaddr *addr,
776 const size_t addrlen,
777 const char *ip_addr,
778 rpc_authflavor_t authflavour,
779 int proto, const struct rpc_timeout *timeparms,
780 u32 minorversion, struct net *net)
781{
782 struct nfs_client_initdata cl_init = {
783 .hostname = hostname,
784 .addr = addr,
785 .addrlen = addrlen,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400786 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400787 .proto = proto,
788 .minorversion = minorversion,
789 .net = net,
790 };
791 struct nfs_client *clp;
792 int error;
793
794 dprintk("--> nfs4_set_client()\n");
795
796 if (server->flags & NFS_MOUNT_NORESVPORT)
797 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
Chuck Leverf112bb42013-06-25 12:23:27 -0400798 if (server->options & NFS_OPTION_MIGRATION)
799 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400800
801 /* Allocate or find a client reference we can use */
802 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
803 if (IS_ERR(clp)) {
804 error = PTR_ERR(clp);
805 goto error;
806 }
807
808 /*
809 * Query for the lease time on clientid setup or renewal
810 *
811 * Note that this will be set on nfs_clients that were created
812 * only for the DS role and did not set this bit, but now will
813 * serve a dual role.
814 */
815 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
816
817 server->nfs_client = clp;
818 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
819 return 0;
820error:
821 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
822 return error;
823}
824
825/*
826 * Set up a pNFS Data Server client.
827 *
828 * Return any existing nfs_client that matches server address,port,version
829 * and minorversion.
830 *
831 * For a new nfs_client, use a soft mount (default), a low retrans and a
832 * low timeout interval so that if a connection is lost, we retry through
833 * the MDS.
834 */
835struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
836 const struct sockaddr *ds_addr, int ds_addrlen,
837 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans)
838{
839 struct nfs_client_initdata cl_init = {
840 .addr = ds_addr,
841 .addrlen = ds_addrlen,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400842 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400843 .proto = ds_proto,
844 .minorversion = mds_clp->cl_minorversion,
845 .net = mds_clp->cl_net,
846 };
847 struct rpc_timeout ds_timeout;
848 struct nfs_client *clp;
849
850 /*
851 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
852 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
853 * (section 13.1 RFC 5661).
854 */
855 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
856 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
857 mds_clp->cl_rpcclient->cl_auth->au_flavor);
858
859 dprintk("<-- %s %p\n", __func__, clp);
860 return clp;
861}
862EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
863
864/*
865 * Session has been established, and the client marked ready.
866 * Set the mount rsize and wsize with negotiated fore channel
867 * attributes which will be bound checked in nfs_server_set_fsinfo.
868 */
869static void nfs4_session_set_rwsize(struct nfs_server *server)
870{
871#ifdef CONFIG_NFS_V4_1
872 struct nfs4_session *sess;
873 u32 server_resp_sz;
874 u32 server_rqst_sz;
875
876 if (!nfs4_has_session(server->nfs_client))
877 return;
878 sess = server->nfs_client->cl_session;
879 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
880 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
881
882 if (server->rsize > server_resp_sz)
883 server->rsize = server_resp_sz;
884 if (server->wsize > server_rqst_sz)
885 server->wsize = server_rqst_sz;
886#endif /* CONFIG_NFS_V4_1 */
887}
888
889static int nfs4_server_common_setup(struct nfs_server *server,
Trond Myklebust5e6b1992013-09-07 12:58:57 -0400890 struct nfs_fh *mntfh, bool auth_probe)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400891{
892 struct nfs_fattr *fattr;
893 int error;
894
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400895 /* data servers support only a subset of NFSv4.1 */
896 if (is_ds_only_client(server->nfs_client))
897 return -EPROTONOSUPPORT;
898
899 fattr = nfs_alloc_fattr();
900 if (fattr == NULL)
901 return -ENOMEM;
902
903 /* We must ensure the session is initialised first */
Andy Adamson18aad3d2013-06-26 12:21:49 -0400904 error = nfs4_init_session(server->nfs_client);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400905 if (error < 0)
906 goto out;
907
Trond Myklebust39c6daa2013-03-15 16:11:57 -0400908 /* Set the basic capabilities */
909 server->caps |= server->nfs_client->cl_mvops->init_caps;
910 if (server->flags & NFS_MOUNT_NORDIRPLUS)
911 server->caps &= ~NFS_CAP_READDIRPLUS;
912 /*
913 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
914 * authentication.
915 */
916 if (nfs4_disable_idmapping &&
917 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
918 server->caps |= NFS_CAP_UIDGID_NOMAP;
919
920
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400921 /* Probe the root fh to retrieve its FSID and filehandle */
Trond Myklebust5e6b1992013-09-07 12:58:57 -0400922 error = nfs4_get_rootfh(server, mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400923 if (error < 0)
924 goto out;
925
926 dprintk("Server FSID: %llx:%llx\n",
927 (unsigned long long) server->fsid.major,
928 (unsigned long long) server->fsid.minor);
Chuck Lever9e6ee762013-10-17 14:12:45 -0400929 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400930
931 nfs4_session_set_rwsize(server);
932
933 error = nfs_probe_fsinfo(server, mntfh, fattr);
934 if (error < 0)
935 goto out;
936
937 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
938 server->namelen = NFS4_MAXNAMLEN;
939
940 nfs_server_insert_lists(server);
941 server->mount_time = jiffies;
942 server->destroy = nfs4_destroy_server;
943out:
944 nfs_free_fattr(fattr);
945 return error;
946}
947
948/*
949 * Create a version 4 volume record
950 */
951static int nfs4_init_server(struct nfs_server *server,
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -0400952 struct nfs_parsed_mount_data *data)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400953{
954 struct rpc_timeout timeparms;
955 int error;
956
957 dprintk("--> nfs4_init_server()\n");
958
959 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
960 data->timeo, data->retrans);
961
962 /* Initialise the client representation from the mount data */
963 server->flags = data->flags;
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400964 server->options = data->options;
Weston Andros Adamson0f5f49b2013-10-18 15:15:17 -0400965 server->auth_info = data->auth_info;
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400966
Weston Andros Adamson4d4b69d2013-10-18 15:15:19 -0400967 /* Use the first specified auth flavor. If this flavor isn't
968 * allowed by the server, use the SECINFO path to try the
969 * other specified flavors */
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -0400970 if (data->auth_info.flavor_len >= 1)
971 data->selected_flavor = data->auth_info.flavors[0];
972 else
973 data->selected_flavor = RPC_AUTH_UNIX;
Trond Myklebust5e6b1992013-09-07 12:58:57 -0400974
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400975 /* Get a client record */
976 error = nfs4_set_client(server,
977 data->nfs_server.hostname,
978 (const struct sockaddr *)&data->nfs_server.address,
979 data->nfs_server.addrlen,
980 data->client_address,
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -0400981 data->selected_flavor,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400982 data->nfs_server.protocol,
983 &timeparms,
984 data->minorversion,
985 data->net);
986 if (error < 0)
987 goto error;
988
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400989 if (data->rsize)
990 server->rsize = nfs_block_size(data->rsize, NULL);
991 if (data->wsize)
992 server->wsize = nfs_block_size(data->wsize, NULL);
993
994 server->acregmin = data->acregmin * HZ;
995 server->acregmax = data->acregmax * HZ;
996 server->acdirmin = data->acdirmin * HZ;
997 server->acdirmax = data->acdirmax * HZ;
998
999 server->port = data->nfs_server.port;
1000
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001001 error = nfs_init_server_rpcclient(server, &timeparms,
1002 data->selected_flavor);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001003
1004error:
1005 /* Done */
1006 dprintk("<-- nfs4_init_server() = %d\n", error);
1007 return error;
1008}
1009
1010/*
1011 * Create a version 4 volume record
1012 * - keyed on server and FSID
1013 */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001014/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1015 struct nfs_fh *mntfh)*/
1016struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1017 struct nfs_subversion *nfs_mod)
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001018{
1019 struct nfs_server *server;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001020 bool auth_probe;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001021 int error;
1022
1023 dprintk("--> nfs4_create_server()\n");
1024
1025 server = nfs_alloc_server();
1026 if (!server)
1027 return ERR_PTR(-ENOMEM);
1028
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001029 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001030
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001031 /* set up the general RPC client */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001032 error = nfs4_init_server(server, mount_info->parsed);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001033 if (error < 0)
1034 goto error;
1035
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001036 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001037 if (error < 0)
1038 goto error;
1039
1040 dprintk("<-- nfs4_create_server() = %p\n", server);
1041 return server;
1042
1043error:
1044 nfs_free_server(server);
1045 dprintk("<-- nfs4_create_server() = error %d\n", error);
1046 return ERR_PTR(error);
1047}
1048
1049/*
1050 * Create an NFS4 referral server record
1051 */
1052struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1053 struct nfs_fh *mntfh)
1054{
1055 struct nfs_client *parent_client;
1056 struct nfs_server *server, *parent_server;
Weston Andros Adamson5837f6d2013-10-18 15:15:18 -04001057 bool auth_probe;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001058 int error;
1059
1060 dprintk("--> nfs4_create_referral_server()\n");
1061
1062 server = nfs_alloc_server();
1063 if (!server)
1064 return ERR_PTR(-ENOMEM);
1065
1066 parent_server = NFS_SB(data->sb);
1067 parent_client = parent_server->nfs_client;
1068
1069 /* Initialise the client representation from the parent server */
1070 nfs_server_copy_userdata(server, parent_server);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001071
1072 /* Get a client representation.
1073 * Note: NFSv4 always uses TCP, */
1074 error = nfs4_set_client(server, data->hostname,
1075 data->addr,
1076 data->addrlen,
1077 parent_client->cl_ipaddr,
1078 data->authflavor,
1079 rpc_protocol(parent_server->client),
1080 parent_server->client->cl_timeout,
1081 parent_client->cl_mvops->minor_version,
1082 parent_client->cl_net);
1083 if (error < 0)
1084 goto error;
1085
1086 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1087 if (error < 0)
1088 goto error;
1089
Weston Andros Adamson5837f6d2013-10-18 15:15:18 -04001090 auth_probe = parent_server->auth_info.flavor_len < 1;
1091
1092 error = nfs4_server_common_setup(server, mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001093 if (error < 0)
1094 goto error;
1095
1096 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1097 return server;
1098
1099error:
1100 nfs_free_server(server);
1101 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1102 return ERR_PTR(error);
1103}
Chuck Lever32e62b72013-10-17 14:12:28 -04001104
1105/*
1106 * Grab the destination's particulars, including lease expiry time.
1107 *
1108 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1109 * we have cached.
1110 */
1111static int nfs_probe_destination(struct nfs_server *server)
1112{
1113 struct inode *inode = server->super->s_root->d_inode;
1114 struct nfs_fattr *fattr;
1115 int error;
1116
1117 fattr = nfs_alloc_fattr();
1118 if (fattr == NULL)
1119 return -ENOMEM;
1120
1121 /* Sanity: the probe won't work if the destination server
1122 * does not recognize the migrated FH. */
1123 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1124
1125 nfs_free_fattr(fattr);
1126 return error;
1127}
1128
1129/**
1130 * nfs4_update_server - Move an nfs_server to a different nfs_client
1131 *
1132 * @server: represents FSID to be moved
1133 * @hostname: new end-point's hostname
1134 * @sap: new end-point's socket address
1135 * @salen: size of "sap"
1136 *
1137 * The nfs_server must be quiescent before this function is invoked.
1138 * Either its session is drained (NFSv4.1+), or its transport is
1139 * plugged and drained (NFSv4.0).
1140 *
1141 * Returns zero on success, or a negative errno value.
1142 */
1143int nfs4_update_server(struct nfs_server *server, const char *hostname,
1144 struct sockaddr *sap, size_t salen)
1145{
1146 struct nfs_client *clp = server->nfs_client;
1147 struct rpc_clnt *clnt = server->client;
1148 struct xprt_create xargs = {
1149 .ident = clp->cl_proto,
1150 .net = &init_net,
1151 .dstaddr = sap,
1152 .addrlen = salen,
1153 .servername = hostname,
1154 };
1155 char buf[INET6_ADDRSTRLEN + 1];
1156 struct sockaddr_storage address;
1157 struct sockaddr *localaddr = (struct sockaddr *)&address;
1158 int error;
1159
1160 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1161 (unsigned long long)server->fsid.major,
1162 (unsigned long long)server->fsid.minor,
1163 hostname);
1164
1165 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1166 if (error != 0) {
1167 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1168 __func__, error);
1169 goto out;
1170 }
1171
1172 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1173 if (error != 0) {
1174 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1175 __func__, error);
1176 goto out;
1177 }
1178
1179 error = -EAFNOSUPPORT;
1180 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1181 dprintk("<-- %s(): rpc_ntop returned %d\n",
1182 __func__, error);
1183 goto out;
1184 }
1185
1186 nfs_server_remove_lists(server);
1187 error = nfs4_set_client(server, hostname, sap, salen, buf,
1188 clp->cl_rpcclient->cl_auth->au_flavor,
1189 clp->cl_proto, clnt->cl_timeout,
1190 clp->cl_minorversion, clp->cl_net);
1191 nfs_put_client(clp);
1192 if (error != 0) {
1193 nfs_server_insert_lists(server);
1194 dprintk("<-- %s(): nfs4_set_client returned %d\n",
1195 __func__, error);
1196 goto out;
1197 }
1198
1199 if (server->nfs_client->cl_hostname == NULL)
1200 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1201 nfs_server_insert_lists(server);
1202
1203 error = nfs_probe_destination(server);
1204 if (error < 0)
1205 goto out;
1206
1207 dprintk("<-- %s() succeeded\n", __func__);
1208
1209out:
1210 return error;
1211}