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TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs4client.c

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  1 /*
  2  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
  3  * Written by David Howells (dhowells@redhat.com)
  4  */
  5 #include <linux/module.h>
  6 #include <linux/nfs_fs.h>
  7 #include <linux/nfs_idmap.h>
  8 #include <linux/nfs_mount.h>
  9 #include <linux/sunrpc/addr.h>
 10 #include <linux/sunrpc/auth.h>
 11 #include <linux/sunrpc/xprt.h>
 12 #include <linux/sunrpc/bc_xprt.h>
 13 #include <linux/sunrpc/rpc_pipe_fs.h>
 14 #include "internal.h"
 15 #include "callback.h"
 16 #include "delegation.h"
 17 #include "nfs4session.h"
 18 #include "pnfs.h"
 19 #include "netns.h"
 20 
 21 #define NFSDBG_FACILITY         NFSDBG_CLIENT
 22 
 23 /*
 24  * 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  */
 27 static 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;
 34         idr_preload(GFP_KERNEL);
 35         spin_lock(&nn->nfs_client_lock);
 36         ret = idr_alloc(&nn->cb_ident_idr, clp, 0, 0, GFP_NOWAIT);
 37         if (ret >= 0)
 38                 clp->cl_cb_ident = ret;
 39         spin_unlock(&nn->nfs_client_lock);
 40         idr_preload_end();
 41         return ret < 0 ? ret : 0;
 42 }
 43 
 44 #ifdef CONFIG_NFS_V4_1
 45 /**
 46  * Per auth flavor data server rpc clients
 47  */
 48 struct 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  */
 56 static struct nfs4_ds_server *
 57 nfs4_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;
 68 out:
 69         rcu_read_unlock();
 70         return dss;
 71 }
 72 
 73 static struct nfs4_ds_server *
 74 nfs4_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;
 88 out:
 89         spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
 90         return dss;
 91 }
 92 
 93 static struct nfs4_ds_server *
 94 nfs4_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 
113 static void
114 nfs4_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 */
124 struct rpc_clnt *
125 nfs4_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);
139 out:
140         return dss->rpc_clnt;
141 }
142 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
143 
144 static void
145 nfs4_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 
159 void nfs41_shutdown_client(struct nfs_client *clp)
160 {
161         if (nfs4_has_session(clp)) {
162                 nfs4_shutdown_ds_clients(clp);
163                 nfs4_destroy_session(clp->cl_session);
164                 nfs4_destroy_clientid(clp);
165         }
166 
167 }
168 #endif  /* CONFIG_NFS_V4_1 */
169 
170 void nfs40_shutdown_client(struct nfs_client *clp)
171 {
172         if (clp->cl_slot_tbl) {
173                 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
174                 kfree(clp->cl_slot_tbl);
175         }
176 }
177 
178 struct 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 
189         if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
190                 err = -EINVAL;
191                 goto error;
192         }
193 
194         spin_lock_init(&clp->cl_lock);
195         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
196         INIT_LIST_HEAD(&clp->cl_ds_clients);
197         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];
201         clp->cl_mig_gen = 1;
202         return clp;
203 
204 error:
205         nfs_free_client(clp);
206         return ERR_PTR(err);
207 }
208 
209 /*
210  * Destroy the NFS4 callback service
211  */
212 static void nfs4_destroy_callback(struct nfs_client *clp)
213 {
214         if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
215                 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
216 }
217 
218 static void nfs4_shutdown_client(struct nfs_client *clp)
219 {
220         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
221                 nfs4_kill_renewd(clp);
222         clp->cl_mvops->shutdown_client(clp);
223         nfs4_destroy_callback(clp);
224         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
225                 nfs_idmap_delete(clp);
226 
227         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
228         kfree(clp->cl_serverowner);
229         kfree(clp->cl_serverscope);
230         kfree(clp->cl_implid);
231         kfree(clp->cl_owner_id);
232 }
233 
234 void nfs4_free_client(struct nfs_client *clp)
235 {
236         nfs4_shutdown_client(clp);
237         nfs_free_client(clp);
238 }
239 
240 /*
241  * Initialize the NFS4 callback service
242  */
243 static int nfs4_init_callback(struct nfs_client *clp)
244 {
245         struct rpc_xprt *xprt;
246         int error;
247 
248         xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
249 
250         if (nfs4_has_session(clp)) {
251                 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
252                 if (error < 0)
253                         return error;
254         }
255 
256         error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
257         if (error < 0) {
258                 dprintk("%s: failed to start callback. Error = %d\n",
259                         __func__, error);
260                 return error;
261         }
262         __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
263 
264         return 0;
265 }
266 
267 /**
268  * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
269  * @clp - nfs_client to initialize
270  *
271  * Returns zero on success, or a negative errno if some error occurred.
272  */
273 int nfs40_init_client(struct nfs_client *clp)
274 {
275         struct nfs4_slot_table *tbl;
276         int ret;
277 
278         tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
279         if (tbl == NULL)
280                 return -ENOMEM;
281 
282         ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
283                                         "NFSv4.0 transport Slot table");
284         if (ret) {
285                 kfree(tbl);
286                 return ret;
287         }
288 
289         clp->cl_slot_tbl = tbl;
290         return 0;
291 }
292 
293 #if defined(CONFIG_NFS_V4_1)
294 
295 /**
296  * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
297  * @clp - nfs_client to initialize
298  *
299  * Returns zero on success, or a negative errno if some error occurred.
300  */
301 int nfs41_init_client(struct nfs_client *clp)
302 {
303         struct nfs4_session *session = NULL;
304 
305         /*
306          * Create the session and mark it expired.
307          * When a SEQUENCE operation encounters the expired session
308          * it will do session recovery to initialize it.
309          */
310         session = nfs4_alloc_session(clp);
311         if (!session)
312                 return -ENOMEM;
313 
314         clp->cl_session = session;
315 
316         /*
317          * The create session reply races with the server back
318          * channel probe. Mark the client NFS_CS_SESSION_INITING
319          * so that the client back channel can find the
320          * nfs_client struct
321          */
322         nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
323         return 0;
324 }
325 
326 #endif  /* CONFIG_NFS_V4_1 */
327 
328 /*
329  * Initialize the minor version specific parts of an NFS4 client record
330  */
331 static int nfs4_init_client_minor_version(struct nfs_client *clp)
332 {
333         int ret;
334 
335         ret = clp->cl_mvops->init_client(clp);
336         if (ret)
337                 return ret;
338         return nfs4_init_callback(clp);
339 }
340 
341 /**
342  * nfs4_init_client - Initialise an NFS4 client record
343  *
344  * @clp: nfs_client to initialise
345  * @timeparms: timeout parameters for underlying RPC transport
346  * @ip_addr: callback IP address in presentation format
347  * @authflavor: authentication flavor for underlying RPC transport
348  *
349  * Returns pointer to an NFS client, or an ERR_PTR value.
350  */
351 struct nfs_client *nfs4_init_client(struct nfs_client *clp,
352                                     const struct rpc_timeout *timeparms,
353                                     const char *ip_addr)
354 {
355         char buf[INET6_ADDRSTRLEN + 1];
356         struct nfs_client *old;
357         int error;
358 
359         if (clp->cl_cons_state == NFS_CS_READY) {
360                 /* the client is initialised already */
361                 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
362                 return clp;
363         }
364 
365         /* Check NFS protocol revision and initialize RPC op vector */
366         clp->rpc_ops = &nfs_v4_clientops;
367 
368         if (clp->cl_minorversion != 0)
369                 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
370         __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
371         __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
372 
373         error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I);
374         if (error == -EINVAL)
375                 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX);
376         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);
408 
409         error = nfs4_discover_server_trunking(clp, &old);
410         if (error < 0)
411                 goto error;
412 
413         if (clp != old)
414                 clp->cl_preserve_clid = true;
415         nfs_put_client(clp);
416         return old;
417 
418 error:
419         nfs_mark_client_ready(clp, error);
420         nfs_put_client(clp);
421         dprintk("<-- nfs4_init_client() = xerror %d\n", error);
422         return ERR_PTR(error);
423 }
424 
425 /*
426  * SETCLIENTID just did a callback update with the callback ident in
427  * "drop," but server trunking discovery claims "drop" and "keep" are
428  * actually the same server.  Swap the callback IDs so that "keep"
429  * will continue to use the callback ident the server now knows about,
430  * and so that "keep"'s original callback ident is destroyed when
431  * "drop" is freed.
432  */
433 static void nfs4_swap_callback_idents(struct nfs_client *keep,
434                                       struct nfs_client *drop)
435 {
436         struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
437         unsigned int save = keep->cl_cb_ident;
438 
439         if (keep->cl_cb_ident == drop->cl_cb_ident)
440                 return;
441 
442         dprintk("%s: keeping callback ident %u and dropping ident %u\n",
443                 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
444 
445         spin_lock(&nn->nfs_client_lock);
446 
447         idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
448         keep->cl_cb_ident = drop->cl_cb_ident;
449 
450         idr_replace(&nn->cb_ident_idr, drop, save);
451         drop->cl_cb_ident = save;
452 
453         spin_unlock(&nn->nfs_client_lock);
454 }
455 
456 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
457                 const struct nfs_client *clp2)
458 {
459         if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
460                 return true;
461         return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
462 }
463 
464 /**
465  * nfs40_walk_client_list - Find server that recognizes a client ID
466  *
467  * @new: nfs_client with client ID to test
468  * @result: OUT: found nfs_client, or new
469  * @cred: credential to use for trunking test
470  *
471  * Returns zero, a negative errno, or a negative NFS4ERR status.
472  * If zero is returned, an nfs_client pointer is planted in "result."
473  *
474  * NB: nfs40_walk_client_list() relies on the new nfs_client being
475  *     the last nfs_client on the list.
476  */
477 int nfs40_walk_client_list(struct nfs_client *new,
478                            struct nfs_client **result,
479                            struct rpc_cred *cred)
480 {
481         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
482         struct nfs_client *pos, *prev = NULL;
483         struct nfs4_setclientid_res clid = {
484                 .clientid       = new->cl_clientid,
485                 .confirm        = new->cl_confirm,
486         };
487         int status = -NFS4ERR_STALE_CLIENTID;
488 
489         spin_lock(&nn->nfs_client_lock);
490         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
491 
492                 if (pos->rpc_ops != new->rpc_ops)
493                         continue;
494 
495                 if (pos->cl_minorversion != new->cl_minorversion)
496                         continue;
497 
498                 /* If "pos" isn't marked ready, we can't trust the
499                  * remaining fields in "pos" */
500                 if (pos->cl_cons_state > NFS_CS_READY) {
501                         atomic_inc(&pos->cl_count);
502                         spin_unlock(&nn->nfs_client_lock);
503 
504                         nfs_put_client(prev);
505                         prev = pos;
506 
507                         status = nfs_wait_client_init_complete(pos);
508                         if (status < 0)
509                                 goto out;
510                         status = -NFS4ERR_STALE_CLIENTID;
511                         spin_lock(&nn->nfs_client_lock);
512                 }
513                 if (pos->cl_cons_state != NFS_CS_READY)
514                         continue;
515 
516                 if (pos->cl_clientid != new->cl_clientid)
517                         continue;
518 
519                 if (!nfs4_match_client_owner_id(pos, new))
520                         continue;
521 
522                 atomic_inc(&pos->cl_count);
523                 spin_unlock(&nn->nfs_client_lock);
524 
525                 nfs_put_client(prev);
526                 prev = pos;
527 
528                 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
529                 switch (status) {
530                 case -NFS4ERR_STALE_CLIENTID:
531                         break;
532                 case 0:
533                         nfs4_swap_callback_idents(pos, new);
534 
535                         prev = NULL;
536                         *result = pos;
537                         dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
538                                 __func__, pos, atomic_read(&pos->cl_count));
539                         goto out;
540                 case -ERESTARTSYS:
541                 case -ETIMEDOUT:
542                         /* The callback path may have been inadvertently
543                          * changed. Schedule recovery!
544                          */
545                         nfs4_schedule_path_down_recovery(pos);
546                 default:
547                         goto out;
548                 }
549 
550                 spin_lock(&nn->nfs_client_lock);
551         }
552         spin_unlock(&nn->nfs_client_lock);
553 
554         /* No match found. The server lost our clientid */
555 out:
556         nfs_put_client(prev);
557         dprintk("NFS: <-- %s status = %d\n", __func__, status);
558         return status;
559 }
560 
561 #ifdef CONFIG_NFS_V4_1
562 /*
563  * Returns true if the client IDs match
564  */
565 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
566 {
567         if (a->cl_clientid != b->cl_clientid) {
568                 dprintk("NFS: --> %s client ID %llx does not match %llx\n",
569                         __func__, a->cl_clientid, b->cl_clientid);
570                 return false;
571         }
572         dprintk("NFS: --> %s client ID %llx matches %llx\n",
573                 __func__, a->cl_clientid, b->cl_clientid);
574         return true;
575 }
576 
577 /*
578  * Returns true if the server major ids match
579  */
580 static bool
581 nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
582 {
583         struct nfs41_server_owner *o1 = a->cl_serverowner;
584         struct nfs41_server_owner *o2 = b->cl_serverowner;
585 
586         if (o1->major_id_sz != o2->major_id_sz)
587                 goto out_major_mismatch;
588         if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
589                 goto out_major_mismatch;
590 
591         dprintk("NFS: --> %s server owners match\n", __func__);
592         return true;
593 
594 out_major_mismatch:
595         dprintk("NFS: --> %s server owner major IDs do not match\n",
596                 __func__);
597         return false;
598 }
599 
600 /**
601  * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
602  *
603  * @new: nfs_client with client ID to test
604  * @result: OUT: found nfs_client, or new
605  * @cred: credential to use for trunking test
606  *
607  * Returns zero, a negative errno, or a negative NFS4ERR status.
608  * If zero is returned, an nfs_client pointer is planted in "result."
609  *
610  * NB: nfs41_walk_client_list() relies on the new nfs_client being
611  *     the last nfs_client on the list.
612  */
613 int nfs41_walk_client_list(struct nfs_client *new,
614                            struct nfs_client **result,
615                            struct rpc_cred *cred)
616 {
617         struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
618         struct nfs_client *pos, *prev = NULL;
619         int status = -NFS4ERR_STALE_CLIENTID;
620 
621         spin_lock(&nn->nfs_client_lock);
622         list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
623 
624                 if (pos == new)
625                         goto found;
626 
627                 if (pos->rpc_ops != new->rpc_ops)
628                         continue;
629 
630                 if (pos->cl_minorversion != new->cl_minorversion)
631                         continue;
632 
633                 /* If "pos" isn't marked ready, we can't trust the
634                  * remaining fields in "pos", especially the client
635                  * ID and serverowner fields.  Wait for CREATE_SESSION
636                  * to finish. */
637                 if (pos->cl_cons_state > NFS_CS_READY) {
638                         atomic_inc(&pos->cl_count);
639                         spin_unlock(&nn->nfs_client_lock);
640 
641                         nfs_put_client(prev);
642                         prev = pos;
643 
644                         status = nfs_wait_client_init_complete(pos);
645                         spin_lock(&nn->nfs_client_lock);
646                         if (status < 0)
647                                 break;
648                         status = -NFS4ERR_STALE_CLIENTID;
649                 }
650                 if (pos->cl_cons_state != NFS_CS_READY)
651                         continue;
652 
653                 if (!nfs4_match_clientids(pos, new))
654                         continue;
655 
656                 /*
657                  * Note that session trunking is just a special subcase of
658                  * client id trunking. In either case, we want to fall back
659                  * to using the existing nfs_client.
660                  */
661                 if (!nfs4_check_clientid_trunking(pos, new))
662                         continue;
663 
664                 /* Unlike NFSv4.0, we know that NFSv4.1 always uses the
665                  * uniform string, however someone might switch the
666                  * uniquifier string on us.
667                  */
668                 if (!nfs4_match_client_owner_id(pos, new))
669                         continue;
670 found:
671                 atomic_inc(&pos->cl_count);
672                 *result = pos;
673                 status = 0;
674                 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
675                         __func__, pos, atomic_read(&pos->cl_count));
676                 break;
677         }
678 
679         /* No matching nfs_client found. */
680         spin_unlock(&nn->nfs_client_lock);
681         dprintk("NFS: <-- %s status = %d\n", __func__, status);
682         nfs_put_client(prev);
683         return status;
684 }
685 #endif  /* CONFIG_NFS_V4_1 */
686 
687 static void nfs4_destroy_server(struct nfs_server *server)
688 {
689         nfs_server_return_all_delegations(server);
690         unset_pnfs_layoutdriver(server);
691         nfs4_purge_state_owners(server);
692 }
693 
694 /*
695  * NFSv4.0 callback thread helper
696  *
697  * Find a client by callback identifier
698  */
699 struct nfs_client *
700 nfs4_find_client_ident(struct net *net, int cb_ident)
701 {
702         struct nfs_client *clp;
703         struct nfs_net *nn = net_generic(net, nfs_net_id);
704 
705         spin_lock(&nn->nfs_client_lock);
706         clp = idr_find(&nn->cb_ident_idr, cb_ident);
707         if (clp)
708                 atomic_inc(&clp->cl_count);
709         spin_unlock(&nn->nfs_client_lock);
710         return clp;
711 }
712 
713 #if defined(CONFIG_NFS_V4_1)
714 /* Common match routine for v4.0 and v4.1 callback services */
715 static bool nfs4_cb_match_client(const struct sockaddr *addr,
716                 struct nfs_client *clp, u32 minorversion)
717 {
718         struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
719 
720         /* Don't match clients that failed to initialise */
721         if (!(clp->cl_cons_state == NFS_CS_READY ||
722             clp->cl_cons_state == NFS_CS_SESSION_INITING))
723                 return false;
724 
725         smp_rmb();
726 
727         /* Match the version and minorversion */
728         if (clp->rpc_ops->version != 4 ||
729             clp->cl_minorversion != minorversion)
730                 return false;
731 
732         /* Match only the IP address, not the port number */
733         if (!nfs_sockaddr_match_ipaddr(addr, clap))
734                 return false;
735 
736         return true;
737 }
738 
739 /*
740  * NFSv4.1 callback thread helper
741  * For CB_COMPOUND calls, find a client by IP address, protocol version,
742  * minorversion, and sessionID
743  *
744  * Returns NULL if no such client
745  */
746 struct nfs_client *
747 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
748                            struct nfs4_sessionid *sid, u32 minorversion)
749 {
750         struct nfs_client *clp;
751         struct nfs_net *nn = net_generic(net, nfs_net_id);
752 
753         spin_lock(&nn->nfs_client_lock);
754         list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
755                 if (nfs4_cb_match_client(addr, clp, minorversion) == false)
756                         continue;
757 
758                 if (!nfs4_has_session(clp))
759                         continue;
760 
761                 /* Match sessionid*/
762                 if (memcmp(clp->cl_session->sess_id.data,
763                     sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
764                         continue;
765 
766                 atomic_inc(&clp->cl_count);
767                 spin_unlock(&nn->nfs_client_lock);
768                 return clp;
769         }
770         spin_unlock(&nn->nfs_client_lock);
771         return NULL;
772 }
773 
774 #else /* CONFIG_NFS_V4_1 */
775 
776 struct nfs_client *
777 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
778                            struct nfs4_sessionid *sid, u32 minorversion)
779 {
780         return NULL;
781 }
782 #endif /* CONFIG_NFS_V4_1 */
783 
784 /*
785  * Set up an NFS4 client
786  */
787 static int nfs4_set_client(struct nfs_server *server,
788                 const char *hostname,
789                 const struct sockaddr *addr,
790                 const size_t addrlen,
791                 const char *ip_addr,
792                 rpc_authflavor_t authflavour,
793                 int proto, const struct rpc_timeout *timeparms,
794                 u32 minorversion, struct net *net)
795 {
796         struct nfs_client_initdata cl_init = {
797                 .hostname = hostname,
798                 .addr = addr,
799                 .addrlen = addrlen,
800                 .nfs_mod = &nfs_v4,
801                 .proto = proto,
802                 .minorversion = minorversion,
803                 .net = net,
804         };
805         struct nfs_client *clp;
806         int error;
807 
808         dprintk("--> nfs4_set_client()\n");
809 
810         if (server->flags & NFS_MOUNT_NORESVPORT)
811                 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
812         if (server->options & NFS_OPTION_MIGRATION)
813                 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
814 
815         /* Allocate or find a client reference we can use */
816         clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour);
817         if (IS_ERR(clp)) {
818                 error = PTR_ERR(clp);
819                 goto error;
820         }
821 
822         /*
823          * Query for the lease time on clientid setup or renewal
824          *
825          * Note that this will be set on nfs_clients that were created
826          * only for the DS role and did not set this bit, but now will
827          * serve a dual role.
828          */
829         set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
830 
831         server->nfs_client = clp;
832         dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
833         return 0;
834 error:
835         dprintk("<-- nfs4_set_client() = xerror %d\n", error);
836         return error;
837 }
838 
839 /*
840  * Set up a pNFS Data Server client.
841  *
842  * Return any existing nfs_client that matches server address,port,version
843  * and minorversion.
844  *
845  * For a new nfs_client, use a soft mount (default), a low retrans and a
846  * low timeout interval so that if a connection is lost, we retry through
847  * the MDS.
848  */
849 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
850                 const struct sockaddr *ds_addr, int ds_addrlen,
851                 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
852                 u32 minor_version, rpc_authflavor_t au_flavor)
853 {
854         struct nfs_client_initdata cl_init = {
855                 .addr = ds_addr,
856                 .addrlen = ds_addrlen,
857                 .nfs_mod = &nfs_v4,
858                 .proto = ds_proto,
859                 .minorversion = minor_version,
860                 .net = mds_clp->cl_net,
861         };
862         struct rpc_timeout ds_timeout;
863         struct nfs_client *clp;
864         char buf[INET6_ADDRSTRLEN + 1];
865 
866         if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
867                 return ERR_PTR(-EINVAL);
868         cl_init.hostname = buf;
869 
870         /*
871          * Set an authflavor equual to the MDS value. Use the MDS nfs_client
872          * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
873          * (section 13.1 RFC 5661).
874          */
875         nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
876         clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr,
877                              au_flavor);
878 
879         dprintk("<-- %s %p\n", __func__, clp);
880         return clp;
881 }
882 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
883 
884 /*
885  * Session has been established, and the client marked ready.
886  * Set the mount rsize and wsize with negotiated fore channel
887  * attributes which will be bound checked in nfs_server_set_fsinfo.
888  */
889 static void nfs4_session_set_rwsize(struct nfs_server *server)
890 {
891 #ifdef CONFIG_NFS_V4_1
892         struct nfs4_session *sess;
893         u32 server_resp_sz;
894         u32 server_rqst_sz;
895 
896         if (!nfs4_has_session(server->nfs_client))
897                 return;
898         sess = server->nfs_client->cl_session;
899         server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
900         server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
901 
902         if (server->rsize > server_resp_sz)
903                 server->rsize = server_resp_sz;
904         if (server->wsize > server_rqst_sz)
905                 server->wsize = server_rqst_sz;
906 #endif /* CONFIG_NFS_V4_1 */
907 }
908 
909 static int nfs4_server_common_setup(struct nfs_server *server,
910                 struct nfs_fh *mntfh, bool auth_probe)
911 {
912         struct nfs_fattr *fattr;
913         int error;
914 
915         /* data servers support only a subset of NFSv4.1 */
916         if (is_ds_only_client(server->nfs_client))
917                 return -EPROTONOSUPPORT;
918 
919         fattr = nfs_alloc_fattr();
920         if (fattr == NULL)
921                 return -ENOMEM;
922 
923         /* We must ensure the session is initialised first */
924         error = nfs4_init_session(server->nfs_client);
925         if (error < 0)
926                 goto out;
927 
928         /* Set the basic capabilities */
929         server->caps |= server->nfs_client->cl_mvops->init_caps;
930         if (server->flags & NFS_MOUNT_NORDIRPLUS)
931                         server->caps &= ~NFS_CAP_READDIRPLUS;
932         /*
933          * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
934          * authentication.
935          */
936         if (nfs4_disable_idmapping &&
937                         server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
938                 server->caps |= NFS_CAP_UIDGID_NOMAP;
939 
940 
941         /* Probe the root fh to retrieve its FSID and filehandle */
942         error = nfs4_get_rootfh(server, mntfh, auth_probe);
943         if (error < 0)
944                 goto out;
945 
946         dprintk("Server FSID: %llx:%llx\n",
947                         (unsigned long long) server->fsid.major,
948                         (unsigned long long) server->fsid.minor);
949         nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
950 
951         nfs4_session_set_rwsize(server);
952 
953         error = nfs_probe_fsinfo(server, mntfh, fattr);
954         if (error < 0)
955                 goto out;
956 
957         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
958                 server->namelen = NFS4_MAXNAMLEN;
959 
960         nfs_server_insert_lists(server);
961         server->mount_time = jiffies;
962         server->destroy = nfs4_destroy_server;
963 out:
964         nfs_free_fattr(fattr);
965         return error;
966 }
967 
968 /*
969  * Create a version 4 volume record
970  */
971 static int nfs4_init_server(struct nfs_server *server,
972                 struct nfs_parsed_mount_data *data)
973 {
974         struct rpc_timeout timeparms;
975         int error;
976 
977         dprintk("--> nfs4_init_server()\n");
978 
979         nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
980                         data->timeo, data->retrans);
981 
982         /* Initialise the client representation from the mount data */
983         server->flags = data->flags;
984         server->options = data->options;
985         server->auth_info = data->auth_info;
986 
987         /* Use the first specified auth flavor. If this flavor isn't
988          * allowed by the server, use the SECINFO path to try the
989          * other specified flavors */
990         if (data->auth_info.flavor_len >= 1)
991                 data->selected_flavor = data->auth_info.flavors[0];
992         else
993                 data->selected_flavor = RPC_AUTH_UNIX;
994 
995         /* Get a client record */
996         error = nfs4_set_client(server,
997                         data->nfs_server.hostname,
998                         (const struct sockaddr *)&data->nfs_server.address,
999                         data->nfs_server.addrlen,
1000                         data->client_address,
1001                         data->selected_flavor,
1002                         data->nfs_server.protocol,
1003                         &timeparms,
1004                         data->minorversion,
1005                         data->net);
1006         if (error < 0)
1007                 goto error;
1008 
1009         if (data->rsize)
1010                 server->rsize = nfs_block_size(data->rsize, NULL);
1011         if (data->wsize)
1012                 server->wsize = nfs_block_size(data->wsize, NULL);
1013 
1014         server->acregmin = data->acregmin * HZ;
1015         server->acregmax = data->acregmax * HZ;
1016         server->acdirmin = data->acdirmin * HZ;
1017         server->acdirmax = data->acdirmax * HZ;
1018 
1019         server->port = data->nfs_server.port;
1020 
1021         error = nfs_init_server_rpcclient(server, &timeparms,
1022                                           data->selected_flavor);
1023 
1024 error:
1025         /* Done */
1026         dprintk("<-- nfs4_init_server() = %d\n", error);
1027         return error;
1028 }
1029 
1030 /*
1031  * Create a version 4 volume record
1032  * - keyed on server and FSID
1033  */
1034 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1035                                       struct nfs_fh *mntfh)*/
1036 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1037                                       struct nfs_subversion *nfs_mod)
1038 {
1039         struct nfs_server *server;
1040         bool auth_probe;
1041         int error;
1042 
1043         dprintk("--> nfs4_create_server()\n");
1044 
1045         server = nfs_alloc_server();
1046         if (!server)
1047                 return ERR_PTR(-ENOMEM);
1048 
1049         auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1050 
1051         /* set up the general RPC client */
1052         error = nfs4_init_server(server, mount_info->parsed);
1053         if (error < 0)
1054                 goto error;
1055 
1056         error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1057         if (error < 0)
1058                 goto error;
1059 
1060         dprintk("<-- nfs4_create_server() = %p\n", server);
1061         return server;
1062 
1063 error:
1064         nfs_free_server(server);
1065         dprintk("<-- nfs4_create_server() = error %d\n", error);
1066         return ERR_PTR(error);
1067 }
1068 
1069 /*
1070  * Create an NFS4 referral server record
1071  */
1072 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1073                                                struct nfs_fh *mntfh)
1074 {
1075         struct nfs_client *parent_client;
1076         struct nfs_server *server, *parent_server;
1077         bool auth_probe;
1078         int error;
1079 
1080         dprintk("--> nfs4_create_referral_server()\n");
1081 
1082         server = nfs_alloc_server();
1083         if (!server)
1084                 return ERR_PTR(-ENOMEM);
1085 
1086         parent_server = NFS_SB(data->sb);
1087         parent_client = parent_server->nfs_client;
1088 
1089         /* Initialise the client representation from the parent server */
1090         nfs_server_copy_userdata(server, parent_server);
1091 
1092         /* Get a client representation.
1093          * Note: NFSv4 always uses TCP, */
1094         error = nfs4_set_client(server, data->hostname,
1095                                 data->addr,
1096                                 data->addrlen,
1097                                 parent_client->cl_ipaddr,
1098                                 data->authflavor,
1099                                 rpc_protocol(parent_server->client),
1100                                 parent_server->client->cl_timeout,
1101                                 parent_client->cl_mvops->minor_version,
1102                                 parent_client->cl_net);
1103         if (error < 0)
1104                 goto error;
1105 
1106         error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1107         if (error < 0)
1108                 goto error;
1109 
1110         auth_probe = parent_server->auth_info.flavor_len < 1;
1111 
1112         error = nfs4_server_common_setup(server, mntfh, auth_probe);
1113         if (error < 0)
1114                 goto error;
1115 
1116         dprintk("<-- nfs_create_referral_server() = %p\n", server);
1117         return server;
1118 
1119 error:
1120         nfs_free_server(server);
1121         dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1122         return ERR_PTR(error);
1123 }
1124 
1125 /*
1126  * Grab the destination's particulars, including lease expiry time.
1127  *
1128  * Returns zero if probe succeeded and retrieved FSID matches the FSID
1129  * we have cached.
1130  */
1131 static int nfs_probe_destination(struct nfs_server *server)
1132 {
1133         struct inode *inode = server->super->s_root->d_inode;
1134         struct nfs_fattr *fattr;
1135         int error;
1136 
1137         fattr = nfs_alloc_fattr();
1138         if (fattr == NULL)
1139                 return -ENOMEM;
1140 
1141         /* Sanity: the probe won't work if the destination server
1142          * does not recognize the migrated FH. */
1143         error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1144 
1145         nfs_free_fattr(fattr);
1146         return error;
1147 }
1148 
1149 /**
1150  * nfs4_update_server - Move an nfs_server to a different nfs_client
1151  *
1152  * @server: represents FSID to be moved
1153  * @hostname: new end-point's hostname
1154  * @sap: new end-point's socket address
1155  * @salen: size of "sap"
1156  * @net: net namespace
1157  *
1158  * The nfs_server must be quiescent before this function is invoked.
1159  * Either its session is drained (NFSv4.1+), or its transport is
1160  * plugged and drained (NFSv4.0).
1161  *
1162  * Returns zero on success, or a negative errno value.
1163  */
1164 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1165                        struct sockaddr *sap, size_t salen, struct net *net)
1166 {
1167         struct nfs_client *clp = server->nfs_client;
1168         struct rpc_clnt *clnt = server->client;
1169         struct xprt_create xargs = {
1170                 .ident          = clp->cl_proto,
1171                 .net            = net,
1172                 .dstaddr        = sap,
1173                 .addrlen        = salen,
1174                 .servername     = hostname,
1175         };
1176         char buf[INET6_ADDRSTRLEN + 1];
1177         struct sockaddr_storage address;
1178         struct sockaddr *localaddr = (struct sockaddr *)&address;
1179         int error;
1180 
1181         dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__,
1182                         (unsigned long long)server->fsid.major,
1183                         (unsigned long long)server->fsid.minor,
1184                         hostname);
1185 
1186         error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1187         if (error != 0) {
1188                 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n",
1189                         __func__, error);
1190                 goto out;
1191         }
1192 
1193         error = rpc_localaddr(clnt, localaddr, sizeof(address));
1194         if (error != 0) {
1195                 dprintk("<-- %s(): rpc_localaddr returned %d\n",
1196                         __func__, error);
1197                 goto out;
1198         }
1199 
1200         error = -EAFNOSUPPORT;
1201         if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) {
1202                 dprintk("<-- %s(): rpc_ntop returned %d\n",
1203                         __func__, error);
1204                 goto out;
1205         }
1206 
1207         nfs_server_remove_lists(server);
1208         error = nfs4_set_client(server, hostname, sap, salen, buf,
1209                                 clp->cl_rpcclient->cl_auth->au_flavor,
1210                                 clp->cl_proto, clnt->cl_timeout,
1211                                 clp->cl_minorversion, net);
1212         nfs_put_client(clp);
1213         if (error != 0) {
1214                 nfs_server_insert_lists(server);
1215                 dprintk("<-- %s(): nfs4_set_client returned %d\n",
1216                         __func__, error);
1217                 goto out;
1218         }
1219 
1220         if (server->nfs_client->cl_hostname == NULL)
1221                 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1222         nfs_server_insert_lists(server);
1223 
1224         error = nfs_probe_destination(server);
1225         if (error < 0)
1226                 goto out;
1227 
1228         dprintk("<-- %s() succeeded\n", __func__);
1229 
1230 out:
1231         return error;
1232 }
1233 

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