blob: 074ac7131459ebc378ef3a1cf50244ff758f2a88 [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>
Bryan Schumakerfcf10392012-07-16 16:39:18 -04007#include <linux/nfs_mount.h>
Jeff Layton59766872013-02-04 12:50:00 -05008#include <linux/sunrpc/addr.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>
Jeff Layton6aa23d72013-11-14 07:25:19 -050012#include <linux/sunrpc/rpc_pipe_fs.h>
Bryan Schumaker428360d2012-07-16 16:39:17 -040013#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"
Anna Schumaker40c64c22015-04-15 13:00:05 -040017#include "nfs4idmap.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);
Benjamin Coddingtonc68a0272015-11-20 09:56:20 -050036 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
Tejun Heod6870312013-02-27 17:05:01 -080037 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) {
Trond Myklebust20b9a902014-02-01 13:47:06 -0500173 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
Chuck Leverabf79bb2013-08-09 12:49:11 -0400174 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;
Jeff Laytona1d617d82016-09-17 18:17:39 -0400202#if IS_ENABLED(CONFIG_NFS_V4_1)
203 init_waitqueue_head(&clp->cl_lock_waitq);
204#endif
Bryan Schumakerec409892012-07-16 16:39:21 -0400205 return clp;
206
207error:
Trond Myklebust7653f6f2012-08-20 12:12:29 -0400208 nfs_free_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400209 return ERR_PTR(err);
210}
211
212/*
213 * Destroy the NFS4 callback service
214 */
215static void nfs4_destroy_callback(struct nfs_client *clp)
216{
217 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
Stanislav Kinsburskyc9465562012-08-20 18:00:16 +0400218 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
Bryan Schumakerec409892012-07-16 16:39:21 -0400219}
220
221static void nfs4_shutdown_client(struct nfs_client *clp)
222{
223 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
224 nfs4_kill_renewd(clp);
Chuck Leverabf79bb2013-08-09 12:49:11 -0400225 clp->cl_mvops->shutdown_client(clp);
Bryan Schumakerec409892012-07-16 16:39:21 -0400226 nfs4_destroy_callback(clp);
227 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
228 nfs_idmap_delete(clp);
229
230 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
231 kfree(clp->cl_serverowner);
232 kfree(clp->cl_serverscope);
233 kfree(clp->cl_implid);
Trond Myklebustceb3a162015-01-03 15:16:04 -0500234 kfree(clp->cl_owner_id);
Bryan Schumakerec409892012-07-16 16:39:21 -0400235}
236
237void nfs4_free_client(struct nfs_client *clp)
238{
239 nfs4_shutdown_client(clp);
240 nfs_free_client(clp);
241}
242
243/*
Bryan Schumaker428360d2012-07-16 16:39:17 -0400244 * Initialize the NFS4 callback service
245 */
246static int nfs4_init_callback(struct nfs_client *clp)
247{
Chuck Leverc2ef47b2014-11-08 20:15:26 -0500248 struct rpc_xprt *xprt;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400249 int error;
250
Chuck Leverc2ef47b2014-11-08 20:15:26 -0500251 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400252
Chuck Leverc2ef47b2014-11-08 20:15:26 -0500253 if (nfs4_has_session(clp)) {
254 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
255 if (error < 0)
Bryan Schumaker428360d2012-07-16 16:39:17 -0400256 return error;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400257 }
Chuck Leverc2ef47b2014-11-08 20:15:26 -0500258
259 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
260 if (error < 0) {
261 dprintk("%s: failed to start callback. Error = %d\n",
262 __func__, error);
263 return error;
264 }
265 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
266
Bryan Schumaker428360d2012-07-16 16:39:17 -0400267 return 0;
268}
269
Chuck Leverabf79bb2013-08-09 12:49:11 -0400270/**
271 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
272 * @clp - nfs_client to initialize
273 *
274 * Returns zero on success, or a negative errno if some error occurred.
275 */
276int nfs40_init_client(struct nfs_client *clp)
277{
278 struct nfs4_slot_table *tbl;
279 int ret;
280
281 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
282 if (tbl == NULL)
283 return -ENOMEM;
284
285 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
286 "NFSv4.0 transport Slot table");
287 if (ret) {
288 kfree(tbl);
289 return ret;
290 }
291
292 clp->cl_slot_tbl = tbl;
293 return 0;
294}
295
296#if defined(CONFIG_NFS_V4_1)
297
298/**
299 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
300 * @clp - nfs_client to initialize
301 *
302 * Returns zero on success, or a negative errno if some error occurred.
303 */
304int nfs41_init_client(struct nfs_client *clp)
305{
306 struct nfs4_session *session = NULL;
307
308 /*
309 * Create the session and mark it expired.
310 * When a SEQUENCE operation encounters the expired session
311 * it will do session recovery to initialize it.
312 */
313 session = nfs4_alloc_session(clp);
314 if (!session)
315 return -ENOMEM;
316
317 clp->cl_session = session;
318
319 /*
320 * The create session reply races with the server back
321 * channel probe. Mark the client NFS_CS_SESSION_INITING
322 * so that the client back channel can find the
323 * nfs_client struct
324 */
325 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
326 return 0;
327}
328
329#endif /* CONFIG_NFS_V4_1 */
330
Bryan Schumaker428360d2012-07-16 16:39:17 -0400331/*
332 * Initialize the minor version specific parts of an NFS4 client record
333 */
334static int nfs4_init_client_minor_version(struct nfs_client *clp)
335{
Chuck Leverabf79bb2013-08-09 12:49:11 -0400336 int ret;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400337
Chuck Leverabf79bb2013-08-09 12:49:11 -0400338 ret = clp->cl_mvops->init_client(clp);
339 if (ret)
340 return ret;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400341 return nfs4_init_callback(clp);
342}
343
344/**
345 * nfs4_init_client - Initialise an NFS4 client record
346 *
347 * @clp: nfs_client to initialise
348 * @timeparms: timeout parameters for underlying RPC transport
349 * @ip_addr: callback IP address in presentation format
350 * @authflavor: authentication flavor for underlying RPC transport
351 *
352 * Returns pointer to an NFS client, or an ERR_PTR value.
353 */
354struct nfs_client *nfs4_init_client(struct nfs_client *clp,
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400355 const struct nfs_client_initdata *cl_init)
Bryan Schumaker428360d2012-07-16 16:39:17 -0400356{
357 char buf[INET6_ADDRSTRLEN + 1];
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400358 const char *ip_addr = cl_init->ip_addr;
Chuck Lever05f4c352012-09-14 17:24:32 -0400359 struct nfs_client *old;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400360 int error;
361
362 if (clp->cl_cons_state == NFS_CS_READY) {
363 /* the client is initialised already */
364 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
365 return clp;
366 }
367
368 /* Check NFS protocol revision and initialize RPC op vector */
369 clp->rpc_ops = &nfs_v4_clientops;
370
Trond Myklebust98f98cf2013-04-14 11:49:51 -0400371 if (clp->cl_minorversion != 0)
372 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400373 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
Trond Myklebust99875242013-09-24 12:06:07 -0400374 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
Jeff Layton6aa23d72013-11-14 07:25:19 -0500375
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400376 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
Trond Myklebust23631222013-04-04 16:14:11 -0400377 if (error == -EINVAL)
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400378 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
Bryan Schumaker428360d2012-07-16 16:39:17 -0400379 if (error < 0)
380 goto error;
381
382 /* If no clientaddr= option was specified, find a usable cb address */
383 if (ip_addr == NULL) {
384 struct sockaddr_storage cb_addr;
385 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
386
387 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
388 if (error < 0)
389 goto error;
390 error = rpc_ntop(sap, buf, sizeof(buf));
391 if (error < 0)
392 goto error;
393 ip_addr = (const char *)buf;
394 }
395 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
396
397 error = nfs_idmap_new(clp);
398 if (error < 0) {
399 dprintk("%s: failed to create idmapper. Error = %d\n",
400 __func__, error);
401 goto error;
402 }
403 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
404
405 error = nfs4_init_client_minor_version(clp);
406 if (error < 0)
407 goto error;
408
409 if (!nfs4_has_session(clp))
410 nfs_mark_client_ready(clp, NFS_CS_READY);
Chuck Lever05f4c352012-09-14 17:24:32 -0400411
412 error = nfs4_discover_server_trunking(clp, &old);
413 if (error < 0)
414 goto error;
Chuck Lever05f4c352012-09-14 17:24:32 -0400415
Weston Andros Adamsonabad2fa2014-01-19 22:45:36 -0500416 if (clp != old)
417 clp->cl_preserve_clid = true;
418 nfs_put_client(clp);
419 return old;
Bryan Schumaker428360d2012-07-16 16:39:17 -0400420
421error:
422 nfs_mark_client_ready(clp, error);
423 nfs_put_client(clp);
424 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
425 return ERR_PTR(error);
426}
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400427
Chuck Lever05f4c352012-09-14 17:24:32 -0400428/*
Chuck Lever05f4c352012-09-14 17:24:32 -0400429 * SETCLIENTID just did a callback update with the callback ident in
430 * "drop," but server trunking discovery claims "drop" and "keep" are
431 * actually the same server. Swap the callback IDs so that "keep"
432 * will continue to use the callback ident the server now knows about,
433 * and so that "keep"'s original callback ident is destroyed when
434 * "drop" is freed.
435 */
436static void nfs4_swap_callback_idents(struct nfs_client *keep,
437 struct nfs_client *drop)
438{
439 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
440 unsigned int save = keep->cl_cb_ident;
441
442 if (keep->cl_cb_ident == drop->cl_cb_ident)
443 return;
444
445 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
446 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
447
448 spin_lock(&nn->nfs_client_lock);
449
450 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
451 keep->cl_cb_ident = drop->cl_cb_ident;
452
453 idr_replace(&nn->cb_ident_idr, drop, save);
454 drop->cl_cb_ident = save;
455
456 spin_unlock(&nn->nfs_client_lock);
457}
458
Trond Myklebust55b9df92015-01-03 15:35:27 -0500459static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
460 const struct nfs_client *clp2)
461{
462 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
463 return true;
464 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
465}
466
Chuck Lever05f4c352012-09-14 17:24:32 -0400467/**
468 * nfs40_walk_client_list - Find server that recognizes a client ID
469 *
470 * @new: nfs_client with client ID to test
471 * @result: OUT: found nfs_client, or new
472 * @cred: credential to use for trunking test
473 *
474 * Returns zero, a negative errno, or a negative NFS4ERR status.
475 * If zero is returned, an nfs_client pointer is planted in "result."
476 *
477 * NB: nfs40_walk_client_list() relies on the new nfs_client being
478 * the last nfs_client on the list.
479 */
480int nfs40_walk_client_list(struct nfs_client *new,
481 struct nfs_client **result,
482 struct rpc_cred *cred)
483{
484 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400485 struct nfs_client *pos, *prev = NULL;
Chuck Lever05f4c352012-09-14 17:24:32 -0400486 struct nfs4_setclientid_res clid = {
487 .clientid = new->cl_clientid,
488 .confirm = new->cl_confirm,
489 };
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500490 int status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400491
492 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400493 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
Steve Dickson080af202014-09-18 09:13:17 -0400494
495 if (pos->rpc_ops != new->rpc_ops)
496 continue;
497
Steve Dickson080af202014-09-18 09:13:17 -0400498 if (pos->cl_minorversion != new->cl_minorversion)
499 continue;
500
Chuck Lever05f4c352012-09-14 17:24:32 -0400501 /* If "pos" isn't marked ready, we can't trust the
502 * remaining fields in "pos" */
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400503 if (pos->cl_cons_state > NFS_CS_READY) {
504 atomic_inc(&pos->cl_count);
505 spin_unlock(&nn->nfs_client_lock);
506
Markus Elfringfe0bf112014-11-18 13:23:43 +0100507 nfs_put_client(prev);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400508 prev = pos;
509
510 status = nfs_wait_client_init_complete(pos);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400511 if (status < 0)
Trond Myklebust64590da2014-01-17 17:03:41 -0500512 goto out;
513 status = -NFS4ERR_STALE_CLIENTID;
514 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400515 }
516 if (pos->cl_cons_state != NFS_CS_READY)
Chuck Lever05f4c352012-09-14 17:24:32 -0400517 continue;
518
Chuck Lever05f4c352012-09-14 17:24:32 -0400519 if (pos->cl_clientid != new->cl_clientid)
520 continue;
521
Trond Myklebust55b9df92015-01-03 15:35:27 -0500522 if (!nfs4_match_client_owner_id(pos, new))
523 continue;
524
Chuck Lever05f4c352012-09-14 17:24:32 -0400525 atomic_inc(&pos->cl_count);
526 spin_unlock(&nn->nfs_client_lock);
527
Markus Elfringfe0bf112014-11-18 13:23:43 +0100528 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500529 prev = pos;
Chuck Lever05f4c352012-09-14 17:24:32 -0400530
531 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500532 switch (status) {
533 case -NFS4ERR_STALE_CLIENTID:
534 break;
535 case 0:
Chuck Lever05f4c352012-09-14 17:24:32 -0400536 nfs4_swap_callback_idents(pos, new);
537
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500538 prev = NULL;
Chuck Lever05f4c352012-09-14 17:24:32 -0400539 *result = pos;
540 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
541 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebustf9b7ebd2014-03-18 14:11:24 -0400542 goto out;
543 case -ERESTARTSYS:
544 case -ETIMEDOUT:
545 /* The callback path may have been inadvertently
546 * changed. Schedule recovery!
547 */
548 nfs4_schedule_path_down_recovery(pos);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500549 default:
550 goto out;
Chuck Lever05f4c352012-09-14 17:24:32 -0400551 }
552
553 spin_lock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400554 }
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500555 spin_unlock(&nn->nfs_client_lock);
Chuck Lever05f4c352012-09-14 17:24:32 -0400556
Trond Myklebust202c3122013-01-18 22:56:23 -0500557 /* No match found. The server lost our clientid */
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500558out:
Markus Elfringfe0bf112014-11-18 13:23:43 +0100559 nfs_put_client(prev);
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500560 dprintk("NFS: <-- %s status = %d\n", __func__, status);
561 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400562}
563
564#ifdef CONFIG_NFS_V4_1
565/*
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700566 * Returns true if the client IDs match
567 */
Andy Adamson8e548ed2016-09-09 09:22:19 -0400568static bool nfs4_match_clientids(u64 a, u64 b)
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700569{
Andy Adamson8e548ed2016-09-09 09:22:19 -0400570 if (a != b) {
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700571 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
Andy Adamson8e548ed2016-09-09 09:22:19 -0400572 __func__, a, b);
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700573 return false;
574 }
575 dprintk("NFS: --> %s client ID %llx matches %llx\n",
Andy Adamson8e548ed2016-09-09 09:22:19 -0400576 __func__, a, b);
Trond Myklebustf9d640f2012-10-01 16:37:51 -0700577 return true;
578}
579
580/*
Trond Myklebust1fc07032015-01-02 16:25:08 -0500581 * Returns true if the server major ids match
Chuck Lever05f4c352012-09-14 17:24:32 -0400582 */
583static bool
Andy Adamsone7b7cbf2016-09-09 09:22:20 -0400584nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
585 struct nfs41_server_owner *o2)
Chuck Lever05f4c352012-09-14 17:24:32 -0400586{
Chuck Lever05f4c352012-09-14 17:24:32 -0400587 if (o1->major_id_sz != o2->major_id_sz)
588 goto out_major_mismatch;
589 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
590 goto out_major_mismatch;
591
Andy Adamsone7b7cbf2016-09-09 09:22:20 -0400592 dprintk("NFS: --> %s server owner major IDs match\n", __func__);
Chuck Lever05f4c352012-09-14 17:24:32 -0400593 return true;
594
595out_major_mismatch:
596 dprintk("NFS: --> %s server owner major IDs do not match\n",
597 __func__);
598 return false;
599}
600
Andy Adamsonba84db92016-09-09 09:22:21 -0400601/*
602 * Returns true if server minor ids match
603 */
604static bool
605nfs4_check_serverowner_minor_id(struct nfs41_server_owner *o1,
606 struct nfs41_server_owner *o2)
607{
608 /* Check eir_server_owner so_minor_id */
609 if (o1->minor_id != o2->minor_id)
610 goto out_minor_mismatch;
611
612 dprintk("NFS: --> %s server owner minor IDs match\n", __func__);
613 return true;
614
615out_minor_mismatch:
616 dprintk("NFS: --> %s server owner minor IDs do not match\n", __func__);
617 return false;
618}
619
620/*
621 * Returns true if the server scopes match
622 */
623static bool
624nfs4_check_server_scope(struct nfs41_server_scope *s1,
625 struct nfs41_server_scope *s2)
626{
627 if (s1->server_scope_sz != s2->server_scope_sz)
628 goto out_scope_mismatch;
629 if (memcmp(s1->server_scope, s2->server_scope,
630 s1->server_scope_sz) != 0)
631 goto out_scope_mismatch;
632
633 dprintk("NFS: --> %s server scopes match\n", __func__);
634 return true;
635
636out_scope_mismatch:
637 dprintk("NFS: --> %s server scopes do not match\n",
638 __func__);
639 return false;
640}
641
642/**
Andy Adamsonad0849a2016-09-09 09:22:28 -0400643 * nfs4_detect_session_trunking - Checks for session trunking.
644 *
645 * Called after a successful EXCHANGE_ID on a multi-addr connection.
646 * Upon success, add the transport.
Andy Adamsonba84db92016-09-09 09:22:21 -0400647 *
648 * @clp: original mount nfs_client
649 * @res: result structure from an exchange_id using the original mount
650 * nfs_client with a new multi_addr transport
651 *
652 * Returns zero on success, otherwise -EINVAL
653 *
654 * Note: since the exchange_id for the new multi_addr transport uses the
655 * same nfs_client from the original mount, the cl_owner_id is reused,
656 * so eir_clientowner is the same.
657 */
658int nfs4_detect_session_trunking(struct nfs_client *clp,
659 struct nfs41_exchange_id_res *res,
660 struct rpc_xprt *xprt)
661{
662 /* Check eir_clientid */
663 if (!nfs4_match_clientids(clp->cl_clientid, res->clientid))
664 goto out_err;
665
666 /* Check eir_server_owner so_major_id */
667 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
668 res->server_owner))
669 goto out_err;
670
671 /* Check eir_server_owner so_minor_id */
672 if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner,
673 res->server_owner))
674 goto out_err;
675
676 /* Check eir_server_scope */
677 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
678 goto out_err;
679
Andy Adamsonad0849a2016-09-09 09:22:28 -0400680 /* Session trunking passed, add the xprt */
681 rpc_clnt_xprt_switch_add_xprt(clp->cl_rpcclient, xprt);
682
Andy Adamsonba84db92016-09-09 09:22:21 -0400683 pr_info("NFS: %s: Session trunking succeeded for %s\n",
684 clp->cl_hostname,
685 xprt->address_strings[RPC_DISPLAY_ADDR]);
686
687 return 0;
688out_err:
689 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
690 xprt->address_strings[RPC_DISPLAY_ADDR]);
691
692 return -EINVAL;
693}
694
Chuck Lever05f4c352012-09-14 17:24:32 -0400695/**
696 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
697 *
698 * @new: nfs_client with client ID to test
699 * @result: OUT: found nfs_client, or new
700 * @cred: credential to use for trunking test
701 *
702 * Returns zero, a negative errno, or a negative NFS4ERR status.
703 * If zero is returned, an nfs_client pointer is planted in "result."
704 *
705 * NB: nfs41_walk_client_list() relies on the new nfs_client being
706 * the last nfs_client on the list.
707 */
708int nfs41_walk_client_list(struct nfs_client *new,
709 struct nfs_client **result,
710 struct rpc_cred *cred)
711{
712 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400713 struct nfs_client *pos, *prev = NULL;
Trond Myklebust202c3122013-01-18 22:56:23 -0500714 int status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400715
716 spin_lock(&nn->nfs_client_lock);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400717 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
Steve Dickson080af202014-09-18 09:13:17 -0400718
Trond Myklebust48d66b92015-03-03 20:28:59 -0500719 if (pos == new)
720 goto found;
721
Steve Dickson080af202014-09-18 09:13:17 -0400722 if (pos->rpc_ops != new->rpc_ops)
723 continue;
724
Steve Dickson080af202014-09-18 09:13:17 -0400725 if (pos->cl_minorversion != new->cl_minorversion)
726 continue;
727
Chuck Lever05f4c352012-09-14 17:24:32 -0400728 /* If "pos" isn't marked ready, we can't trust the
729 * remaining fields in "pos", especially the client
730 * ID and serverowner fields. Wait for CREATE_SESSION
731 * to finish. */
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400732 if (pos->cl_cons_state > NFS_CS_READY) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400733 atomic_inc(&pos->cl_count);
734 spin_unlock(&nn->nfs_client_lock);
735
Markus Elfringfe0bf112014-11-18 13:23:43 +0100736 nfs_put_client(prev);
Chuck Lever05f4c352012-09-14 17:24:32 -0400737 prev = pos;
738
Trond Myklebust202c3122013-01-18 22:56:23 -0500739 status = nfs_wait_client_init_complete(pos);
Chuck Lever05f4c352012-09-14 17:24:32 -0400740 spin_lock(&nn->nfs_client_lock);
Trond Myklebust65436ec2013-01-18 23:01:43 -0500741 if (status < 0)
Trond Myklebust64590da2014-01-17 17:03:41 -0500742 break;
743 status = -NFS4ERR_STALE_CLIENTID;
Chuck Lever05f4c352012-09-14 17:24:32 -0400744 }
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400745 if (pos->cl_cons_state != NFS_CS_READY)
746 continue;
Chuck Lever05f4c352012-09-14 17:24:32 -0400747
Andy Adamson8e548ed2016-09-09 09:22:19 -0400748 if (!nfs4_match_clientids(pos->cl_clientid, new->cl_clientid))
Chuck Lever05f4c352012-09-14 17:24:32 -0400749 continue;
750
Trond Myklebust1fc07032015-01-02 16:25:08 -0500751 /*
752 * Note that session trunking is just a special subcase of
753 * client id trunking. In either case, we want to fall back
754 * to using the existing nfs_client.
755 */
Andy Adamsone7b7cbf2016-09-09 09:22:20 -0400756 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
757 new->cl_serverowner))
Chuck Lever05f4c352012-09-14 17:24:32 -0400758 continue;
759
Trond Myklebust55b9df92015-01-03 15:35:27 -0500760 /* Unlike NFSv4.0, we know that NFSv4.1 always uses the
761 * uniform string, however someone might switch the
762 * uniquifier string on us.
763 */
764 if (!nfs4_match_client_owner_id(pos, new))
765 continue;
Trond Myklebust48d66b92015-03-03 20:28:59 -0500766found:
Trond Myklebust4ae19c22013-01-18 22:41:53 -0500767 atomic_inc(&pos->cl_count);
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400768 *result = pos;
Trond Myklebusteb04e0a2013-04-10 12:44:18 -0400769 status = 0;
Chuck Lever05f4c352012-09-14 17:24:32 -0400770 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
771 __func__, pos, atomic_read(&pos->cl_count));
Trond Myklebust7b1f1fd2013-04-05 16:11:11 -0400772 break;
Chuck Lever05f4c352012-09-14 17:24:32 -0400773 }
774
Chuck Lever05f4c352012-09-14 17:24:32 -0400775 spin_unlock(&nn->nfs_client_lock);
Trond Myklebust202c3122013-01-18 22:56:23 -0500776 dprintk("NFS: <-- %s status = %d\n", __func__, status);
Markus Elfringfe0bf112014-11-18 13:23:43 +0100777 nfs_put_client(prev);
Trond Myklebust202c3122013-01-18 22:56:23 -0500778 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400779}
780#endif /* CONFIG_NFS_V4_1 */
781
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400782static void nfs4_destroy_server(struct nfs_server *server)
783{
784 nfs_server_return_all_delegations(server);
785 unset_pnfs_layoutdriver(server);
786 nfs4_purge_state_owners(server);
787}
788
789/*
790 * NFSv4.0 callback thread helper
791 *
792 * Find a client by callback identifier
793 */
794struct nfs_client *
795nfs4_find_client_ident(struct net *net, int cb_ident)
796{
797 struct nfs_client *clp;
798 struct nfs_net *nn = net_generic(net, nfs_net_id);
799
800 spin_lock(&nn->nfs_client_lock);
801 clp = idr_find(&nn->cb_ident_idr, cb_ident);
802 if (clp)
803 atomic_inc(&clp->cl_count);
804 spin_unlock(&nn->nfs_client_lock);
805 return clp;
806}
807
808#if defined(CONFIG_NFS_V4_1)
809/* Common match routine for v4.0 and v4.1 callback services */
810static bool nfs4_cb_match_client(const struct sockaddr *addr,
811 struct nfs_client *clp, u32 minorversion)
812{
813 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
814
815 /* Don't match clients that failed to initialise */
816 if (!(clp->cl_cons_state == NFS_CS_READY ||
817 clp->cl_cons_state == NFS_CS_SESSION_INITING))
818 return false;
819
820 smp_rmb();
821
822 /* Match the version and minorversion */
823 if (clp->rpc_ops->version != 4 ||
824 clp->cl_minorversion != minorversion)
825 return false;
826
827 /* Match only the IP address, not the port number */
Anna Schumakerd8efa4e2015-07-13 14:01:28 -0400828 return rpc_cmp_addr(addr, clap);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400829}
830
831/*
832 * NFSv4.1 callback thread helper
833 * For CB_COMPOUND calls, find a client by IP address, protocol version,
834 * minorversion, and sessionID
835 *
836 * Returns NULL if no such client
837 */
838struct nfs_client *
839nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400840 struct nfs4_sessionid *sid, u32 minorversion)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400841{
842 struct nfs_client *clp;
843 struct nfs_net *nn = net_generic(net, nfs_net_id);
844
845 spin_lock(&nn->nfs_client_lock);
846 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400847 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400848 continue;
849
850 if (!nfs4_has_session(clp))
851 continue;
852
853 /* Match sessionid*/
854 if (memcmp(clp->cl_session->sess_id.data,
855 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
856 continue;
857
858 atomic_inc(&clp->cl_count);
859 spin_unlock(&nn->nfs_client_lock);
860 return clp;
861 }
862 spin_unlock(&nn->nfs_client_lock);
863 return NULL;
864}
865
866#else /* CONFIG_NFS_V4_1 */
867
868struct nfs_client *
869nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400870 struct nfs4_sessionid *sid, u32 minorversion)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400871{
872 return NULL;
873}
874#endif /* CONFIG_NFS_V4_1 */
875
876/*
877 * Set up an NFS4 client
878 */
879static int nfs4_set_client(struct nfs_server *server,
880 const char *hostname,
881 const struct sockaddr *addr,
882 const size_t addrlen,
883 const char *ip_addr,
884 rpc_authflavor_t authflavour,
885 int proto, const struct rpc_timeout *timeparms,
886 u32 minorversion, struct net *net)
887{
888 struct nfs_client_initdata cl_init = {
889 .hostname = hostname,
890 .addr = addr,
891 .addrlen = addrlen,
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400892 .ip_addr = ip_addr,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400893 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400894 .proto = proto,
895 .minorversion = minorversion,
896 .net = net,
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400897 .timeparms = timeparms,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400898 };
899 struct nfs_client *clp;
900 int error;
901
902 dprintk("--> nfs4_set_client()\n");
903
904 if (server->flags & NFS_MOUNT_NORESVPORT)
905 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
Chuck Leverf112bb42013-06-25 12:23:27 -0400906 if (server->options & NFS_OPTION_MIGRATION)
907 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400908
909 /* Allocate or find a client reference we can use */
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400910 clp = nfs_get_client(&cl_init, authflavour);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400911 if (IS_ERR(clp)) {
912 error = PTR_ERR(clp);
913 goto error;
914 }
915
Benjamin Coddington52442f92016-08-30 09:20:32 -0400916 if (server->nfs_client == clp) {
917 error = -ELOOP;
918 goto error;
919 }
920
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400921 /*
922 * Query for the lease time on clientid setup or renewal
923 *
924 * Note that this will be set on nfs_clients that were created
925 * only for the DS role and did not set this bit, but now will
926 * serve a dual role.
927 */
928 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
929
930 server->nfs_client = clp;
931 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
932 return 0;
933error:
934 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
935 return error;
936}
937
938/*
939 * Set up a pNFS Data Server client.
940 *
941 * Return any existing nfs_client that matches server address,port,version
942 * and minorversion.
943 *
944 * For a new nfs_client, use a soft mount (default), a low retrans and a
945 * low timeout interval so that if a connection is lost, we retry through
946 * the MDS.
947 */
Tigran Mkrtchyan3fc75f12016-06-13 19:57:35 +0200948struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400949 const struct sockaddr *ds_addr, int ds_addrlen,
Peng Tao064172f2014-05-29 21:07:00 +0800950 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
Peng Tao30626f92014-05-30 18:15:58 +0800951 u32 minor_version, rpc_authflavor_t au_flavor)
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400952{
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400953 struct rpc_timeout ds_timeout;
Tigran Mkrtchyan3fc75f12016-06-13 19:57:35 +0200954 struct nfs_client *mds_clp = mds_srv->nfs_client;
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400955 struct nfs_client_initdata cl_init = {
956 .addr = ds_addr,
957 .addrlen = ds_addrlen,
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400958 .nodename = mds_clp->cl_rpcclient->cl_nodename,
959 .ip_addr = mds_clp->cl_ipaddr,
Bryan Schumakerab7017a2012-07-30 16:05:16 -0400960 .nfs_mod = &nfs_v4,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400961 .proto = ds_proto,
Peng Tao30626f92014-05-30 18:15:58 +0800962 .minorversion = minor_version,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400963 .net = mds_clp->cl_net,
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400964 .timeparms = &ds_timeout,
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400965 };
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400966 struct nfs_client *clp;
Peng Taoa363e322014-07-08 11:45:47 +0800967 char buf[INET6_ADDRSTRLEN + 1];
968
969 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
970 return ERR_PTR(-EINVAL);
971 cl_init.hostname = buf;
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400972
Tigran Mkrtchyan3fc75f12016-06-13 19:57:35 +0200973 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
974 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
975
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400976 /*
977 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
978 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
979 * (section 13.1 RFC 5661).
980 */
981 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
Trond Myklebust5c6e5b62016-06-22 14:13:12 -0400982 clp = nfs_get_client(&cl_init, au_flavor);
Bryan Schumakerfcf10392012-07-16 16:39:18 -0400983
984 dprintk("<-- %s %p\n", __func__, clp);
985 return clp;
986}
987EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
988
989/*
990 * Session has been established, and the client marked ready.
991 * Set the mount rsize and wsize with negotiated fore channel
992 * attributes which will be bound checked in nfs_server_set_fsinfo.
993 */
994static void nfs4_session_set_rwsize(struct nfs_server *server)
995{
996#ifdef CONFIG_NFS_V4_1
997 struct nfs4_session *sess;
998 u32 server_resp_sz;
999 u32 server_rqst_sz;
1000
1001 if (!nfs4_has_session(server->nfs_client))
1002 return;
1003 sess = server->nfs_client->cl_session;
1004 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1005 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1006
1007 if (server->rsize > server_resp_sz)
1008 server->rsize = server_resp_sz;
1009 if (server->wsize > server_rqst_sz)
1010 server->wsize = server_rqst_sz;
1011#endif /* CONFIG_NFS_V4_1 */
1012}
1013
1014static int nfs4_server_common_setup(struct nfs_server *server,
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001015 struct nfs_fh *mntfh, bool auth_probe)
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001016{
1017 struct nfs_fattr *fattr;
1018 int error;
1019
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001020 /* data servers support only a subset of NFSv4.1 */
1021 if (is_ds_only_client(server->nfs_client))
1022 return -EPROTONOSUPPORT;
1023
1024 fattr = nfs_alloc_fattr();
1025 if (fattr == NULL)
1026 return -ENOMEM;
1027
1028 /* We must ensure the session is initialised first */
Andy Adamson18aad3d2013-06-26 12:21:49 -04001029 error = nfs4_init_session(server->nfs_client);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001030 if (error < 0)
1031 goto out;
1032
Trond Myklebust39c6daa2013-03-15 16:11:57 -04001033 /* Set the basic capabilities */
1034 server->caps |= server->nfs_client->cl_mvops->init_caps;
1035 if (server->flags & NFS_MOUNT_NORDIRPLUS)
1036 server->caps &= ~NFS_CAP_READDIRPLUS;
1037 /*
1038 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1039 * authentication.
1040 */
1041 if (nfs4_disable_idmapping &&
1042 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1043 server->caps |= NFS_CAP_UIDGID_NOMAP;
1044
1045
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001046 /* Probe the root fh to retrieve its FSID and filehandle */
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001047 error = nfs4_get_rootfh(server, mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001048 if (error < 0)
1049 goto out;
1050
1051 dprintk("Server FSID: %llx:%llx\n",
1052 (unsigned long long) server->fsid.major,
1053 (unsigned long long) server->fsid.minor);
Chuck Lever9e6ee762013-10-17 14:12:45 -04001054 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001055
1056 nfs4_session_set_rwsize(server);
1057
1058 error = nfs_probe_fsinfo(server, mntfh, fattr);
1059 if (error < 0)
1060 goto out;
1061
1062 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1063 server->namelen = NFS4_MAXNAMLEN;
1064
1065 nfs_server_insert_lists(server);
1066 server->mount_time = jiffies;
1067 server->destroy = nfs4_destroy_server;
1068out:
1069 nfs_free_fattr(fattr);
1070 return error;
1071}
1072
1073/*
1074 * Create a version 4 volume record
1075 */
1076static int nfs4_init_server(struct nfs_server *server,
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001077 struct nfs_parsed_mount_data *data)
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001078{
1079 struct rpc_timeout timeparms;
1080 int error;
1081
1082 dprintk("--> nfs4_init_server()\n");
1083
1084 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1085 data->timeo, data->retrans);
1086
1087 /* Initialise the client representation from the mount data */
1088 server->flags = data->flags;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001089 server->options = data->options;
Weston Andros Adamson0f5f49b2013-10-18 15:15:17 -04001090 server->auth_info = data->auth_info;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001091
Weston Andros Adamson4d4b69d2013-10-18 15:15:19 -04001092 /* Use the first specified auth flavor. If this flavor isn't
1093 * allowed by the server, use the SECINFO path to try the
1094 * other specified flavors */
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001095 if (data->auth_info.flavor_len >= 1)
1096 data->selected_flavor = data->auth_info.flavors[0];
1097 else
1098 data->selected_flavor = RPC_AUTH_UNIX;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001099
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001100 /* Get a client record */
1101 error = nfs4_set_client(server,
1102 data->nfs_server.hostname,
1103 (const struct sockaddr *)&data->nfs_server.address,
1104 data->nfs_server.addrlen,
1105 data->client_address,
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001106 data->selected_flavor,
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001107 data->nfs_server.protocol,
1108 &timeparms,
1109 data->minorversion,
1110 data->net);
1111 if (error < 0)
1112 goto error;
1113
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001114 if (data->rsize)
1115 server->rsize = nfs_block_size(data->rsize, NULL);
1116 if (data->wsize)
1117 server->wsize = nfs_block_size(data->wsize, NULL);
1118
1119 server->acregmin = data->acregmin * HZ;
1120 server->acregmax = data->acregmax * HZ;
1121 server->acdirmin = data->acdirmin * HZ;
1122 server->acdirmax = data->acdirmax * HZ;
1123
1124 server->port = data->nfs_server.port;
1125
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001126 error = nfs_init_server_rpcclient(server, &timeparms,
1127 data->selected_flavor);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001128
1129error:
1130 /* Done */
1131 dprintk("<-- nfs4_init_server() = %d\n", error);
1132 return error;
1133}
1134
1135/*
1136 * Create a version 4 volume record
1137 * - keyed on server and FSID
1138 */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001139/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1140 struct nfs_fh *mntfh)*/
1141struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1142 struct nfs_subversion *nfs_mod)
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001143{
1144 struct nfs_server *server;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001145 bool auth_probe;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001146 int error;
1147
1148 dprintk("--> nfs4_create_server()\n");
1149
1150 server = nfs_alloc_server();
1151 if (!server)
1152 return ERR_PTR(-ENOMEM);
1153
Weston Andros Adamsona3f73c22013-10-18 15:15:16 -04001154 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001155
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001156 /* set up the general RPC client */
Bryan Schumaker1179acc2012-07-30 16:05:19 -04001157 error = nfs4_init_server(server, mount_info->parsed);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001158 if (error < 0)
1159 goto error;
1160
Trond Myklebust5e6b1992013-09-07 12:58:57 -04001161 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001162 if (error < 0)
1163 goto error;
1164
1165 dprintk("<-- nfs4_create_server() = %p\n", server);
1166 return server;
1167
1168error:
1169 nfs_free_server(server);
1170 dprintk("<-- nfs4_create_server() = error %d\n", error);
1171 return ERR_PTR(error);
1172}
1173
1174/*
1175 * Create an NFS4 referral server record
1176 */
1177struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1178 struct nfs_fh *mntfh)
1179{
1180 struct nfs_client *parent_client;
1181 struct nfs_server *server, *parent_server;
Weston Andros Adamson5837f6d2013-10-18 15:15:18 -04001182 bool auth_probe;
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001183 int error;
1184
1185 dprintk("--> nfs4_create_referral_server()\n");
1186
1187 server = nfs_alloc_server();
1188 if (!server)
1189 return ERR_PTR(-ENOMEM);
1190
1191 parent_server = NFS_SB(data->sb);
1192 parent_client = parent_server->nfs_client;
1193
1194 /* Initialise the client representation from the parent server */
1195 nfs_server_copy_userdata(server, parent_server);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001196
1197 /* Get a client representation.
1198 * Note: NFSv4 always uses TCP, */
1199 error = nfs4_set_client(server, data->hostname,
1200 data->addr,
1201 data->addrlen,
1202 parent_client->cl_ipaddr,
1203 data->authflavor,
1204 rpc_protocol(parent_server->client),
1205 parent_server->client->cl_timeout,
1206 parent_client->cl_mvops->minor_version,
1207 parent_client->cl_net);
1208 if (error < 0)
1209 goto error;
1210
1211 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1212 if (error < 0)
1213 goto error;
1214
Weston Andros Adamson5837f6d2013-10-18 15:15:18 -04001215 auth_probe = parent_server->auth_info.flavor_len < 1;
1216
1217 error = nfs4_server_common_setup(server, mntfh, auth_probe);
Bryan Schumakerfcf10392012-07-16 16:39:18 -04001218 if (error < 0)
1219 goto error;
1220
1221 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1222 return server;
1223
1224error:
1225 nfs_free_server(server);
1226 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1227 return ERR_PTR(error);
1228}
Chuck Lever32e62b72013-10-17 14:12:28 -04001229
1230/*
1231 * Grab the destination's particulars, including lease expiry time.
1232 *
1233 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1234 * we have cached.
1235 */
1236static int nfs_probe_destination(struct nfs_server *server)
1237{
David Howells2b0143b2015-03-17 22:25:59 +00001238 struct inode *inode = d_inode(server->super->s_root);
Chuck Lever32e62b72013-10-17 14:12:28 -04001239 struct nfs_fattr *fattr;
1240 int error;
1241
1242 fattr = nfs_alloc_fattr();
1243 if (fattr == NULL)
1244 return -ENOMEM;
1245
1246 /* Sanity: the probe won't work if the destination server
1247 * does not recognize the migrated FH. */
1248 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1249
1250 nfs_free_fattr(fattr);
1251 return error;
1252}
1253
1254/**
1255 * nfs4_update_server - Move an nfs_server to a different nfs_client
1256 *
1257 * @server: represents FSID to be moved
1258 * @hostname: new end-point's hostname
1259 * @sap: new end-point's socket address
1260 * @salen: size of "sap"
Trond Myklebust292f5032014-02-16 21:42:56 -05001261 * @net: net namespace
Chuck Lever32e62b72013-10-17 14:12:28 -04001262 *
1263 * The nfs_server must be quiescent before this function is invoked.
1264 * Either its session is drained (NFSv4.1+), or its transport is
1265 * plugged and drained (NFSv4.0).
1266 *
1267 * Returns zero on success, or a negative errno value.
1268 */
1269int nfs4_update_server(struct nfs_server *server, const char *hostname,
Trond Myklebust292f5032014-02-16 21:42:56 -05001270 struct sockaddr *sap, size_t salen, struct net *net)
Chuck Lever32e62b72013-10-17 14:12:28 -04001271{
1272 struct nfs_client *clp = server->nfs_client;
1273 struct rpc_clnt *clnt = server->client;
1274 struct xprt_create xargs = {
1275 .ident = clp->cl_proto,
Trond Myklebust292f5032014-02-16 21:42:56 -05001276 .net = net,
Chuck Lever32e62b72013-10-17 14:12:28 -04001277 .dstaddr = sap,
1278 .addrlen = salen,
1279 .servername = hostname,
1280 };
1281 char buf[INET6_ADDRSTRLEN + 1];
1282 struct sockaddr_storage address;
1283 struct sockaddr *localaddr = (struct sockaddr *)&address;
1284 int error;
1285
1286 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1287 (unsigned long long)server->fsid.major,
1288 (unsigned long long)server->fsid.minor,
1289 hostname);
1290
1291 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1292 if (error != 0) {
1293 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1294 __func__, error);
1295 goto out;
1296 }
1297
1298 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1299 if (error != 0) {
1300 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1301 __func__, error);
1302 goto out;
1303 }
1304
1305 error = -EAFNOSUPPORT;
1306 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1307 dprintk("<-- %s(): rpc_ntop returned %d\n",
1308 __func__, error);
1309 goto out;
1310 }
1311
1312 nfs_server_remove_lists(server);
1313 error = nfs4_set_client(server, hostname, sap, salen, buf,
1314 clp->cl_rpcclient->cl_auth->au_flavor,
1315 clp->cl_proto, clnt->cl_timeout,
Trond Myklebust292f5032014-02-16 21:42:56 -05001316 clp->cl_minorversion, net);
Chuck Lever32e62b72013-10-17 14:12:28 -04001317 nfs_put_client(clp);
1318 if (error != 0) {
1319 nfs_server_insert_lists(server);
1320 dprintk("<-- %s(): nfs4_set_client returned %d\n",
1321 __func__, error);
1322 goto out;
1323 }
1324
1325 if (server->nfs_client->cl_hostname == NULL)
1326 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1327 nfs_server_insert_lists(server);
1328
1329 error = nfs_probe_destination(server);
1330 if (error < 0)
1331 goto out;
1332
1333 dprintk("<-- %s() succeeded\n", __func__);
1334
1335out:
1336 return error;
1337}