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regression: cifs endianness bug
[linux-2.6/openmoko-kernel/knife-kernel.git] / fs / nfs / client.c
blob70587f383f10708ba33b5f0d7b3492fc20359487
1 /* client.c: NFS client sharing and management code
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/sunrpc/xprtsock.h>
27 #include <linux/sunrpc/xprtrdma.h>
28 #include <linux/nfs_fs.h>
29 #include <linux/nfs_mount.h>
30 #include <linux/nfs4_mount.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/seq_file.h>
33 #include <linux/mount.h>
34 #include <linux/nfs_idmap.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38
39 #include <asm/system.h>
40
41 #include "nfs4_fs.h"
42 #include "callback.h"
43 #include "delegation.h"
44 #include "iostat.h"
45 #include "internal.h"
46
47 #define NFSDBG_FACILITY NFSDBG_CLIENT
48
49 static DEFINE_SPINLOCK(nfs_client_lock);
50 static LIST_HEAD(nfs_client_list);
51 static LIST_HEAD(nfs_volume_list);
52 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
53
54 /*
55 * RPC cruft for NFS
56 */
57 static struct rpc_version *nfs_version[5] = {
58 [2] = &nfs_version2,
59 #ifdef CONFIG_NFS_V3
60 [3] = &nfs_version3,
61 #endif
62 #ifdef CONFIG_NFS_V4
63 [4] = &nfs_version4,
64 #endif
65 };
66
67 struct rpc_program nfs_program = {
68 .name = "nfs",
69 .number = NFS_PROGRAM,
70 .nrvers = ARRAY_SIZE(nfs_version),
71 .version = nfs_version,
72 .stats = &nfs_rpcstat,
73 .pipe_dir_name = "/nfs",
74 };
75
76 struct rpc_stat nfs_rpcstat = {
77 .program = &nfs_program
78 };
79
80
81 #ifdef CONFIG_NFS_V3_ACL
82 static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
83 static struct rpc_version * nfsacl_version[] = {
84 [3] = &nfsacl_version3,
85 };
86
87 struct rpc_program nfsacl_program = {
88 .name = "nfsacl",
89 .number = NFS_ACL_PROGRAM,
90 .nrvers = ARRAY_SIZE(nfsacl_version),
91 .version = nfsacl_version,
92 .stats = &nfsacl_rpcstat,
93 };
94 #endif /* CONFIG_NFS_V3_ACL */
95
96 /*
97 * Allocate a shared client record
98 *
99 * Since these are allocated/deallocated very rarely, we don't
100 * bother putting them in a slab cache...
101 */
102 static struct nfs_client *nfs_alloc_client(const char *hostname,
103 const struct sockaddr_in *addr,
104 int nfsversion)
105 {
106 struct nfs_client *clp;
107
108 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
109 goto error_0;
110
111 if (nfsversion == 4) {
112 if (nfs_callback_up() < 0)
113 goto error_2;
114 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
115 }
116
117 atomic_set(&clp->cl_count, 1);
118 clp->cl_cons_state = NFS_CS_INITING;
119
120 clp->cl_nfsversion = nfsversion;
121 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
122
123 if (hostname) {
124 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
125 if (!clp->cl_hostname)
126 goto error_3;
127 }
128
129 INIT_LIST_HEAD(&clp->cl_superblocks);
130 clp->cl_rpcclient = ERR_PTR(-EINVAL);
131
132 #ifdef CONFIG_NFS_V4
133 init_rwsem(&clp->cl_sem);
134 INIT_LIST_HEAD(&clp->cl_delegations);
135 spin_lock_init(&clp->cl_lock);
136 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
137 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
138 clp->cl_boot_time = CURRENT_TIME;
139 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
140 #endif
141
142 return clp;
143
144 error_3:
145 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
146 nfs_callback_down();
147 error_2:
148 kfree(clp);
149 error_0:
150 return NULL;
151 }
152
153 static void nfs4_shutdown_client(struct nfs_client *clp)
154 {
155 #ifdef CONFIG_NFS_V4
156 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
157 nfs4_kill_renewd(clp);
158 BUG_ON(!RB_EMPTY_ROOT(&clp->cl_state_owners));
159 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
160 nfs_idmap_delete(clp);
161 #endif
162 }
163
164 /*
165 * Destroy a shared client record
166 */
167 static void nfs_free_client(struct nfs_client *clp)
168 {
169 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
170
171 nfs4_shutdown_client(clp);
172
173 /* -EIO all pending I/O */
174 if (!IS_ERR(clp->cl_rpcclient))
175 rpc_shutdown_client(clp->cl_rpcclient);
176
177 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
178 nfs_callback_down();
179
180 kfree(clp->cl_hostname);
181 kfree(clp);
182
183 dprintk("<-- nfs_free_client()\n");
184 }
185
186 /*
187 * Release a reference to a shared client record
188 */
189 void nfs_put_client(struct nfs_client *clp)
190 {
191 if (!clp)
192 return;
193
194 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
195
196 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
197 list_del(&clp->cl_share_link);
198 spin_unlock(&nfs_client_lock);
199
200 BUG_ON(!list_empty(&clp->cl_superblocks));
201
202 nfs_free_client(clp);
203 }
204 }
205
206 /*
207 * Find a client by address
208 * - caller must hold nfs_client_lock
209 */
210 static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)
211 {
212 struct nfs_client *clp;
213
214 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
215 /* Don't match clients that failed to initialise properly */
216 if (clp->cl_cons_state < 0)
217 continue;
218
219 /* Different NFS versions cannot share the same nfs_client */
220 if (clp->cl_nfsversion != nfsversion)
221 continue;
222
223 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
224 sizeof(clp->cl_addr.sin_addr)) != 0)
225 continue;
226
227 if (!match_port || clp->cl_addr.sin_port == addr->sin_port)
228 goto found;
229 }
230
231 return NULL;
232
233 found:
234 atomic_inc(&clp->cl_count);
235 return clp;
236 }
237
238 /*
239 * Find a client by IP address and protocol version
240 * - returns NULL if no such client
241 */
242 struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
243 {
244 struct nfs_client *clp;
245
246 spin_lock(&nfs_client_lock);
247 clp = __nfs_find_client(addr, nfsversion, 0);
248 spin_unlock(&nfs_client_lock);
249 if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {
250 nfs_put_client(clp);
251 clp = NULL;
252 }
253 return clp;
254 }
255
256 /*
257 * Look up a client by IP address and protocol version
258 * - creates a new record if one doesn't yet exist
259 */
260 static struct nfs_client *nfs_get_client(const char *hostname,
261 const struct sockaddr_in *addr,
262 int nfsversion)
263 {
264 struct nfs_client *clp, *new = NULL;
265 int error;
266
267 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
268 hostname ?: "", NIPQUAD(addr->sin_addr),
269 addr->sin_port, nfsversion);
270
271 /* see if the client already exists */
272 do {
273 spin_lock(&nfs_client_lock);
274
275 clp = __nfs_find_client(addr, nfsversion, 1);
276 if (clp)
277 goto found_client;
278 if (new)
279 goto install_client;
280
281 spin_unlock(&nfs_client_lock);
282
283 new = nfs_alloc_client(hostname, addr, nfsversion);
284 } while (new);
285
286 return ERR_PTR(-ENOMEM);
287
288 /* install a new client and return with it unready */
289 install_client:
290 clp = new;
291 list_add(&clp->cl_share_link, &nfs_client_list);
292 spin_unlock(&nfs_client_lock);
293 dprintk("--> nfs_get_client() = %p [new]\n", clp);
294 return clp;
295
296 /* found an existing client
297 * - make sure it's ready before returning
298 */
299 found_client:
300 spin_unlock(&nfs_client_lock);
301
302 if (new)
303 nfs_free_client(new);
304
305 error = wait_event_interruptible(nfs_client_active_wq,
306 clp->cl_cons_state != NFS_CS_INITING);
307 if (error < 0) {
308 nfs_put_client(clp);
309 return ERR_PTR(-ERESTARTSYS);
310 }
311
312 if (clp->cl_cons_state < NFS_CS_READY) {
313 error = clp->cl_cons_state;
314 nfs_put_client(clp);
315 return ERR_PTR(error);
316 }
317
318 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
319
320 dprintk("--> nfs_get_client() = %p [share]\n", clp);
321 return clp;
322 }
323
324 /*
325 * Mark a server as ready or failed
326 */
327 static void nfs_mark_client_ready(struct nfs_client *clp, int state)
328 {
329 clp->cl_cons_state = state;
330 wake_up_all(&nfs_client_active_wq);
331 }
332
333 /*
334 * Initialise the timeout values for a connection
335 */
336 static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
337 unsigned int timeo, unsigned int retrans)
338 {
339 to->to_initval = timeo * HZ / 10;
340 to->to_retries = retrans;
341 if (!to->to_retries)
342 to->to_retries = 2;
343
344 switch (proto) {
345 case XPRT_TRANSPORT_TCP:
346 case XPRT_TRANSPORT_RDMA:
347 if (!to->to_initval)
348 to->to_initval = 60 * HZ;
349 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
350 to->to_initval = NFS_MAX_TCP_TIMEOUT;
351 to->to_increment = to->to_initval;
352 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
353 to->to_exponential = 0;
354 break;
355 case XPRT_TRANSPORT_UDP:
356 default:
357 if (!to->to_initval)
358 to->to_initval = 11 * HZ / 10;
359 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
360 to->to_initval = NFS_MAX_UDP_TIMEOUT;
361 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
362 to->to_exponential = 1;
363 break;
364 }
365 }
366
367 /*
368 * Create an RPC client handle
369 */
370 static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
371 unsigned int timeo,
372 unsigned int retrans,
373 rpc_authflavor_t flavor,
374 int flags)
375 {
376 struct rpc_timeout timeparms;
377 struct rpc_clnt *clnt = NULL;
378 struct rpc_create_args args = {
379 .protocol = proto,
380 .address = (struct sockaddr *)&clp->cl_addr,
381 .addrsize = sizeof(clp->cl_addr),
382 .timeout = &timeparms,
383 .servername = clp->cl_hostname,
384 .program = &nfs_program,
385 .version = clp->rpc_ops->version,
386 .authflavor = flavor,
387 .flags = flags,
388 };
389
390 if (!IS_ERR(clp->cl_rpcclient))
391 return 0;
392
393 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
394 clp->retrans_timeo = timeparms.to_initval;
395 clp->retrans_count = timeparms.to_retries;
396
397 clnt = rpc_create(&args);
398 if (IS_ERR(clnt)) {
399 dprintk("%s: cannot create RPC client. Error = %ld\n",
400 __FUNCTION__, PTR_ERR(clnt));
401 return PTR_ERR(clnt);
402 }
403
404 clp->cl_rpcclient = clnt;
405 return 0;
406 }
407
408 /*
409 * Version 2 or 3 client destruction
410 */
411 static void nfs_destroy_server(struct nfs_server *server)
412 {
413 if (!IS_ERR(server->client_acl))
414 rpc_shutdown_client(server->client_acl);
415
416 if (!(server->flags & NFS_MOUNT_NONLM))
417 lockd_down(); /* release rpc.lockd */
418 }
419
420 /*
421 * Version 2 or 3 lockd setup
422 */
423 static int nfs_start_lockd(struct nfs_server *server)
424 {
425 int error = 0;
426
427 if (server->nfs_client->cl_nfsversion > 3)
428 goto out;
429 if (server->flags & NFS_MOUNT_NONLM)
430 goto out;
431 error = lockd_up((server->flags & NFS_MOUNT_TCP) ?
432 IPPROTO_TCP : IPPROTO_UDP);
433 if (error < 0)
434 server->flags |= NFS_MOUNT_NONLM;
435 else
436 server->destroy = nfs_destroy_server;
437 out:
438 return error;
439 }
440
441 /*
442 * Initialise an NFSv3 ACL client connection
443 */
444 #ifdef CONFIG_NFS_V3_ACL
445 static void nfs_init_server_aclclient(struct nfs_server *server)
446 {
447 if (server->nfs_client->cl_nfsversion != 3)
448 goto out_noacl;
449 if (server->flags & NFS_MOUNT_NOACL)
450 goto out_noacl;
451
452 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
453 if (IS_ERR(server->client_acl))
454 goto out_noacl;
455
456 /* No errors! Assume that Sun nfsacls are supported */
457 server->caps |= NFS_CAP_ACLS;
458 return;
459
460 out_noacl:
461 server->caps &= ~NFS_CAP_ACLS;
462 }
463 #else
464 static inline void nfs_init_server_aclclient(struct nfs_server *server)
465 {
466 server->flags &= ~NFS_MOUNT_NOACL;
467 server->caps &= ~NFS_CAP_ACLS;
468 }
469 #endif
470
471 /*
472 * Create a general RPC client
473 */
474 static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
475 {
476 struct nfs_client *clp = server->nfs_client;
477
478 server->client = rpc_clone_client(clp->cl_rpcclient);
479 if (IS_ERR(server->client)) {
480 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
481 return PTR_ERR(server->client);
482 }
483
484 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
485 struct rpc_auth *auth;
486
487 auth = rpcauth_create(pseudoflavour, server->client);
488 if (IS_ERR(auth)) {
489 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
490 return PTR_ERR(auth);
491 }
492 }
493 server->client->cl_softrtry = 0;
494 if (server->flags & NFS_MOUNT_SOFT)
495 server->client->cl_softrtry = 1;
496
497 server->client->cl_intr = 0;
498 if (server->flags & NFS4_MOUNT_INTR)
499 server->client->cl_intr = 1;
500
501 return 0;
502 }
503
504 /*
505 * Initialise an NFS2 or NFS3 client
506 */
507 static int nfs_init_client(struct nfs_client *clp,
508 const struct nfs_parsed_mount_data *data)
509 {
510 int error;
511
512 if (clp->cl_cons_state == NFS_CS_READY) {
513 /* the client is already initialised */
514 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
515 return 0;
516 }
517
518 /* Check NFS protocol revision and initialize RPC op vector */
519 clp->rpc_ops = &nfs_v2_clientops;
520 #ifdef CONFIG_NFS_V3
521 if (clp->cl_nfsversion == 3)
522 clp->rpc_ops = &nfs_v3_clientops;
523 #endif
524 /*
525 * Create a client RPC handle for doing FSSTAT with UNIX auth only
526 * - RFC 2623, sec 2.3.2
527 */
528 error = nfs_create_rpc_client(clp, data->nfs_server.protocol,
529 data->timeo, data->retrans, RPC_AUTH_UNIX, 0);
530 if (error < 0)
531 goto error;
532 nfs_mark_client_ready(clp, NFS_CS_READY);
533 return 0;
534
535 error:
536 nfs_mark_client_ready(clp, error);
537 dprintk("<-- nfs_init_client() = xerror %d\n", error);
538 return error;
539 }
540
541 /*
542 * Create a version 2 or 3 client
543 */
544 static int nfs_init_server(struct nfs_server *server,
545 const struct nfs_parsed_mount_data *data)
546 {
547 struct nfs_client *clp;
548 int error, nfsvers = 2;
549
550 dprintk("--> nfs_init_server()\n");
551
552 #ifdef CONFIG_NFS_V3
553 if (data->flags & NFS_MOUNT_VER3)
554 nfsvers = 3;
555 #endif
556
557 /* Allocate or find a client reference we can use */
558 clp = nfs_get_client(data->nfs_server.hostname,
559 &data->nfs_server.address, nfsvers);
560 if (IS_ERR(clp)) {
561 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
562 return PTR_ERR(clp);
563 }
564
565 error = nfs_init_client(clp, data);
566 if (error < 0)
567 goto error;
568
569 server->nfs_client = clp;
570
571 /* Initialise the client representation from the mount data */
572 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
573
574 if (data->rsize)
575 server->rsize = nfs_block_size(data->rsize, NULL);
576 if (data->wsize)
577 server->wsize = nfs_block_size(data->wsize, NULL);
578
579 server->acregmin = data->acregmin * HZ;
580 server->acregmax = data->acregmax * HZ;
581 server->acdirmin = data->acdirmin * HZ;
582 server->acdirmax = data->acdirmax * HZ;
583
584 /* Start lockd here, before we might error out */
585 error = nfs_start_lockd(server);
586 if (error < 0)
587 goto error;
588
589 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
590 if (error < 0)
591 goto error;
592
593 server->namelen = data->namlen;
594 /* Create a client RPC handle for the NFSv3 ACL management interface */
595 nfs_init_server_aclclient(server);
596 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
597 return 0;
598
599 error:
600 server->nfs_client = NULL;
601 nfs_put_client(clp);
602 dprintk("<-- nfs_init_server() = xerror %d\n", error);
603 return error;
604 }
605
606 /*
607 * Load up the server record from information gained in an fsinfo record
608 */
609 static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
610 {
611 unsigned long max_rpc_payload;
612
613 /* Work out a lot of parameters */
614 if (server->rsize == 0)
615 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
616 if (server->wsize == 0)
617 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
618
619 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
620 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
621 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
622 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
623
624 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
625 if (server->rsize > max_rpc_payload)
626 server->rsize = max_rpc_payload;
627 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
628 server->rsize = NFS_MAX_FILE_IO_SIZE;
629 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
630
631 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
632
633 if (server->wsize > max_rpc_payload)
634 server->wsize = max_rpc_payload;
635 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
636 server->wsize = NFS_MAX_FILE_IO_SIZE;
637 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
638 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
639
640 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
641 if (server->dtsize > PAGE_CACHE_SIZE)
642 server->dtsize = PAGE_CACHE_SIZE;
643 if (server->dtsize > server->rsize)
644 server->dtsize = server->rsize;
645
646 if (server->flags & NFS_MOUNT_NOAC) {
647 server->acregmin = server->acregmax = 0;
648 server->acdirmin = server->acdirmax = 0;
649 }
650
651 server->maxfilesize = fsinfo->maxfilesize;
652
653 /* We're airborne Set socket buffersize */
654 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
655 }
656
657 /*
658 * Probe filesystem information, including the FSID on v2/v3
659 */
660 static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
661 {
662 struct nfs_fsinfo fsinfo;
663 struct nfs_client *clp = server->nfs_client;
664 int error;
665
666 dprintk("--> nfs_probe_fsinfo()\n");
667
668 if (clp->rpc_ops->set_capabilities != NULL) {
669 error = clp->rpc_ops->set_capabilities(server, mntfh);
670 if (error < 0)
671 goto out_error;
672 }
673
674 fsinfo.fattr = fattr;
675 nfs_fattr_init(fattr);
676 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
677 if (error < 0)
678 goto out_error;
679
680 nfs_server_set_fsinfo(server, &fsinfo);
681 error = bdi_init(&server->backing_dev_info);
682 if (error)
683 goto out_error;
684
685
686 /* Get some general file system info */
687 if (server->namelen == 0) {
688 struct nfs_pathconf pathinfo;
689
690 pathinfo.fattr = fattr;
691 nfs_fattr_init(fattr);
692
693 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
694 server->namelen = pathinfo.max_namelen;
695 }
696
697 dprintk("<-- nfs_probe_fsinfo() = 0\n");
698 return 0;
699
700 out_error:
701 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
702 return error;
703 }
704
705 /*
706 * Copy useful information when duplicating a server record
707 */
708 static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
709 {
710 target->flags = source->flags;
711 target->acregmin = source->acregmin;
712 target->acregmax = source->acregmax;
713 target->acdirmin = source->acdirmin;
714 target->acdirmax = source->acdirmax;
715 target->caps = source->caps;
716 }
717
718 /*
719 * Allocate and initialise a server record
720 */
721 static struct nfs_server *nfs_alloc_server(void)
722 {
723 struct nfs_server *server;
724
725 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
726 if (!server)
727 return NULL;
728
729 server->client = server->client_acl = ERR_PTR(-EINVAL);
730
731 /* Zero out the NFS state stuff */
732 INIT_LIST_HEAD(&server->client_link);
733 INIT_LIST_HEAD(&server->master_link);
734
735 server->io_stats = nfs_alloc_iostats();
736 if (!server->io_stats) {
737 kfree(server);
738 return NULL;
739 }
740
741 return server;
742 }
743
744 /*
745 * Free up a server record
746 */
747 void nfs_free_server(struct nfs_server *server)
748 {
749 dprintk("--> nfs_free_server()\n");
750
751 spin_lock(&nfs_client_lock);
752 list_del(&server->client_link);
753 list_del(&server->master_link);
754 spin_unlock(&nfs_client_lock);
755
756 if (server->destroy != NULL)
757 server->destroy(server);
758 if (!IS_ERR(server->client))
759 rpc_shutdown_client(server->client);
760
761 nfs_put_client(server->nfs_client);
762
763 nfs_free_iostats(server->io_stats);
764 bdi_destroy(&server->backing_dev_info);
765 kfree(server);
766 nfs_release_automount_timer();
767 dprintk("<-- nfs_free_server()\n");
768 }
769
770 /*
771 * Create a version 2 or 3 volume record
772 * - keyed on server and FSID
773 */
774 struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
775 struct nfs_fh *mntfh)
776 {
777 struct nfs_server *server;
778 struct nfs_fattr fattr;
779 int error;
780
781 server = nfs_alloc_server();
782 if (!server)
783 return ERR_PTR(-ENOMEM);
784
785 /* Get a client representation */
786 error = nfs_init_server(server, data);
787 if (error < 0)
788 goto error;
789
790 BUG_ON(!server->nfs_client);
791 BUG_ON(!server->nfs_client->rpc_ops);
792 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
793
794 /* Probe the root fh to retrieve its FSID */
795 error = nfs_probe_fsinfo(server, mntfh, &fattr);
796 if (error < 0)
797 goto error;
798 if (server->nfs_client->rpc_ops->version == 3) {
799 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
800 server->namelen = NFS3_MAXNAMLEN;
801 if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
802 server->caps |= NFS_CAP_READDIRPLUS;
803 } else {
804 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
805 server->namelen = NFS2_MAXNAMLEN;
806 }
807
808 if (!(fattr.valid & NFS_ATTR_FATTR)) {
809 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
810 if (error < 0) {
811 dprintk("nfs_create_server: getattr error = %d\n", -error);
812 goto error;
813 }
814 }
815 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
816
817 dprintk("Server FSID: %llx:%llx\n",
818 (unsigned long long) server->fsid.major,
819 (unsigned long long) server->fsid.minor);
820
821 BUG_ON(!server->nfs_client);
822 BUG_ON(!server->nfs_client->rpc_ops);
823 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
824
825 spin_lock(&nfs_client_lock);
826 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
827 list_add_tail(&server->master_link, &nfs_volume_list);
828 spin_unlock(&nfs_client_lock);
829
830 server->mount_time = jiffies;
831 return server;
832
833 error:
834 nfs_free_server(server);
835 return ERR_PTR(error);
836 }
837
838 #ifdef CONFIG_NFS_V4
839 /*
840 * Initialise an NFS4 client record
841 */
842 static int nfs4_init_client(struct nfs_client *clp,
843 int proto, int timeo, int retrans,
844 const char *ip_addr,
845 rpc_authflavor_t authflavour)
846 {
847 int error;
848
849 if (clp->cl_cons_state == NFS_CS_READY) {
850 /* the client is initialised already */
851 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
852 return 0;
853 }
854
855 /* Check NFS protocol revision and initialize RPC op vector */
856 clp->rpc_ops = &nfs_v4_clientops;
857
858 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour,
859 RPC_CLNT_CREATE_DISCRTRY);
860 if (error < 0)
861 goto error;
862 memcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
863
864 error = nfs_idmap_new(clp);
865 if (error < 0) {
866 dprintk("%s: failed to create idmapper. Error = %d\n",
867 __FUNCTION__, error);
868 goto error;
869 }
870 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
871
872 nfs_mark_client_ready(clp, NFS_CS_READY);
873 return 0;
874
875 error:
876 nfs_mark_client_ready(clp, error);
877 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
878 return error;
879 }
880
881 /*
882 * Set up an NFS4 client
883 */
884 static int nfs4_set_client(struct nfs_server *server,
885 const char *hostname, const struct sockaddr_in *addr,
886 const char *ip_addr,
887 rpc_authflavor_t authflavour,
888 int proto, int timeo, int retrans)
889 {
890 struct nfs_client *clp;
891 int error;
892
893 dprintk("--> nfs4_set_client()\n");
894
895 /* Allocate or find a client reference we can use */
896 clp = nfs_get_client(hostname, addr, 4);
897 if (IS_ERR(clp)) {
898 error = PTR_ERR(clp);
899 goto error;
900 }
901 error = nfs4_init_client(clp, proto, timeo, retrans, ip_addr, authflavour);
902 if (error < 0)
903 goto error_put;
904
905 server->nfs_client = clp;
906 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
907 return 0;
908
909 error_put:
910 nfs_put_client(clp);
911 error:
912 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
913 return error;
914 }
915
916 /*
917 * Create a version 4 volume record
918 */
919 static int nfs4_init_server(struct nfs_server *server,
920 const struct nfs_parsed_mount_data *data)
921 {
922 int error;
923
924 dprintk("--> nfs4_init_server()\n");
925
926 /* Initialise the client representation from the mount data */
927 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
928 server->caps |= NFS_CAP_ATOMIC_OPEN;
929
930 if (data->rsize)
931 server->rsize = nfs_block_size(data->rsize, NULL);
932 if (data->wsize)
933 server->wsize = nfs_block_size(data->wsize, NULL);
934
935 server->acregmin = data->acregmin * HZ;
936 server->acregmax = data->acregmax * HZ;
937 server->acdirmin = data->acdirmin * HZ;
938 server->acdirmax = data->acdirmax * HZ;
939
940 error = nfs_init_server_rpcclient(server, data->auth_flavors[0]);
941
942 /* Done */
943 dprintk("<-- nfs4_init_server() = %d\n", error);
944 return error;
945 }
946
947 /*
948 * Create a version 4 volume record
949 * - keyed on server and FSID
950 */
951 struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
952 struct nfs_fh *mntfh)
953 {
954 struct nfs_fattr fattr;
955 struct nfs_server *server;
956 int error;
957
958 dprintk("--> nfs4_create_server()\n");
959
960 server = nfs_alloc_server();
961 if (!server)
962 return ERR_PTR(-ENOMEM);
963
964 /* Get a client record */
965 error = nfs4_set_client(server,
966 data->nfs_server.hostname,
967 &data->nfs_server.address,
968 data->client_address,
969 data->auth_flavors[0],
970 data->nfs_server.protocol,
971 data->timeo, data->retrans);
972 if (error < 0)
973 goto error;
974
975 /* set up the general RPC client */
976 error = nfs4_init_server(server, data);
977 if (error < 0)
978 goto error;
979
980 BUG_ON(!server->nfs_client);
981 BUG_ON(!server->nfs_client->rpc_ops);
982 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
983
984 /* Probe the root fh to retrieve its FSID */
985 error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
986 if (error < 0)
987 goto error;
988
989 dprintk("Server FSID: %llx:%llx\n",
990 (unsigned long long) server->fsid.major,
991 (unsigned long long) server->fsid.minor);
992 dprintk("Mount FH: %d\n", mntfh->size);
993
994 error = nfs_probe_fsinfo(server, mntfh, &fattr);
995 if (error < 0)
996 goto error;
997
998 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
999 server->namelen = NFS4_MAXNAMLEN;
1000
1001 BUG_ON(!server->nfs_client);
1002 BUG_ON(!server->nfs_client->rpc_ops);
1003 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1004
1005 spin_lock(&nfs_client_lock);
1006 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1007 list_add_tail(&server->master_link, &nfs_volume_list);
1008 spin_unlock(&nfs_client_lock);
1009
1010 server->mount_time = jiffies;
1011 dprintk("<-- nfs4_create_server() = %p\n", server);
1012 return server;
1013
1014 error:
1015 nfs_free_server(server);
1016 dprintk("<-- nfs4_create_server() = error %d\n", error);
1017 return ERR_PTR(error);
1018 }
1019
1020 /*
1021 * Create an NFS4 referral server record
1022 */
1023 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1024 struct nfs_fh *mntfh)
1025 {
1026 struct nfs_client *parent_client;
1027 struct nfs_server *server, *parent_server;
1028 struct nfs_fattr fattr;
1029 int error;
1030
1031 dprintk("--> nfs4_create_referral_server()\n");
1032
1033 server = nfs_alloc_server();
1034 if (!server)
1035 return ERR_PTR(-ENOMEM);
1036
1037 parent_server = NFS_SB(data->sb);
1038 parent_client = parent_server->nfs_client;
1039
1040 /* Get a client representation.
1041 * Note: NFSv4 always uses TCP, */
1042 error = nfs4_set_client(server, data->hostname, data->addr,
1043 parent_client->cl_ipaddr,
1044 data->authflavor,
1045 parent_server->client->cl_xprt->prot,
1046 parent_client->retrans_timeo,
1047 parent_client->retrans_count);
1048 if (error < 0)
1049 goto error;
1050
1051 /* Initialise the client representation from the parent server */
1052 nfs_server_copy_userdata(server, parent_server);
1053 server->caps |= NFS_CAP_ATOMIC_OPEN;
1054
1055 error = nfs_init_server_rpcclient(server, data->authflavor);
1056 if (error < 0)
1057 goto error;
1058
1059 BUG_ON(!server->nfs_client);
1060 BUG_ON(!server->nfs_client->rpc_ops);
1061 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1062
1063 /* Probe the root fh to retrieve its FSID and filehandle */
1064 error = nfs4_path_walk(server, mntfh, data->mnt_path);
1065 if (error < 0)
1066 goto error;
1067
1068 /* probe the filesystem info for this server filesystem */
1069 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1070 if (error < 0)
1071 goto error;
1072
1073 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1074 server->namelen = NFS4_MAXNAMLEN;
1075
1076 dprintk("Referral FSID: %llx:%llx\n",
1077 (unsigned long long) server->fsid.major,
1078 (unsigned long long) server->fsid.minor);
1079
1080 spin_lock(&nfs_client_lock);
1081 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1082 list_add_tail(&server->master_link, &nfs_volume_list);
1083 spin_unlock(&nfs_client_lock);
1084
1085 server->mount_time = jiffies;
1086
1087 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1088 return server;
1089
1090 error:
1091 nfs_free_server(server);
1092 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1093 return ERR_PTR(error);
1094 }
1095
1096 #endif /* CONFIG_NFS_V4 */
1097
1098 /*
1099 * Clone an NFS2, NFS3 or NFS4 server record
1100 */
1101 struct nfs_server *nfs_clone_server(struct nfs_server *source,
1102 struct nfs_fh *fh,
1103 struct nfs_fattr *fattr)
1104 {
1105 struct nfs_server *server;
1106 struct nfs_fattr fattr_fsinfo;
1107 int error;
1108
1109 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1110 (unsigned long long) fattr->fsid.major,
1111 (unsigned long long) fattr->fsid.minor);
1112
1113 server = nfs_alloc_server();
1114 if (!server)
1115 return ERR_PTR(-ENOMEM);
1116
1117 /* Copy data from the source */
1118 server->nfs_client = source->nfs_client;
1119 atomic_inc(&server->nfs_client->cl_count);
1120 nfs_server_copy_userdata(server, source);
1121
1122 server->fsid = fattr->fsid;
1123
1124 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
1125 if (error < 0)
1126 goto out_free_server;
1127 if (!IS_ERR(source->client_acl))
1128 nfs_init_server_aclclient(server);
1129
1130 /* probe the filesystem info for this server filesystem */
1131 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1132 if (error < 0)
1133 goto out_free_server;
1134
1135 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1136 server->namelen = NFS4_MAXNAMLEN;
1137
1138 dprintk("Cloned FSID: %llx:%llx\n",
1139 (unsigned long long) server->fsid.major,
1140 (unsigned long long) server->fsid.minor);
1141
1142 error = nfs_start_lockd(server);
1143 if (error < 0)
1144 goto out_free_server;
1145
1146 spin_lock(&nfs_client_lock);
1147 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1148 list_add_tail(&server->master_link, &nfs_volume_list);
1149 spin_unlock(&nfs_client_lock);
1150
1151 server->mount_time = jiffies;
1152
1153 dprintk("<-- nfs_clone_server() = %p\n", server);
1154 return server;
1155
1156 out_free_server:
1157 nfs_free_server(server);
1158 dprintk("<-- nfs_clone_server() = error %d\n", error);
1159 return ERR_PTR(error);
1160 }
1161
1162 #ifdef CONFIG_PROC_FS
1163 static struct proc_dir_entry *proc_fs_nfs;
1164
1165 static int nfs_server_list_open(struct inode *inode, struct file *file);
1166 static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1167 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1168 static void nfs_server_list_stop(struct seq_file *p, void *v);
1169 static int nfs_server_list_show(struct seq_file *m, void *v);
1170
1171 static struct seq_operations nfs_server_list_ops = {
1172 .start = nfs_server_list_start,
1173 .next = nfs_server_list_next,
1174 .stop = nfs_server_list_stop,
1175 .show = nfs_server_list_show,
1176 };
1177
1178 static const struct file_operations nfs_server_list_fops = {
1179 .open = nfs_server_list_open,
1180 .read = seq_read,
1181 .llseek = seq_lseek,
1182 .release = seq_release,
1183 };
1184
1185 static int nfs_volume_list_open(struct inode *inode, struct file *file);
1186 static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1187 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1188 static void nfs_volume_list_stop(struct seq_file *p, void *v);
1189 static int nfs_volume_list_show(struct seq_file *m, void *v);
1190
1191 static struct seq_operations nfs_volume_list_ops = {
1192 .start = nfs_volume_list_start,
1193 .next = nfs_volume_list_next,
1194 .stop = nfs_volume_list_stop,
1195 .show = nfs_volume_list_show,
1196 };
1197
1198 static const struct file_operations nfs_volume_list_fops = {
1199 .open = nfs_volume_list_open,
1200 .read = seq_read,
1201 .llseek = seq_lseek,
1202 .release = seq_release,
1203 };
1204
1205 /*
1206 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1207 * we're dealing
1208 */
1209 static int nfs_server_list_open(struct inode *inode, struct file *file)
1210 {
1211 struct seq_file *m;
1212 int ret;
1213
1214 ret = seq_open(file, &nfs_server_list_ops);
1215 if (ret < 0)
1216 return ret;
1217
1218 m = file->private_data;
1219 m->private = PDE(inode)->data;
1220
1221 return 0;
1222 }
1223
1224 /*
1225 * set up the iterator to start reading from the server list and return the first item
1226 */
1227 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1228 {
1229 /* lock the list against modification */
1230 spin_lock(&nfs_client_lock);
1231 return seq_list_start_head(&nfs_client_list, *_pos);
1232 }
1233
1234 /*
1235 * move to next server
1236 */
1237 static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1238 {
1239 return seq_list_next(v, &nfs_client_list, pos);
1240 }
1241
1242 /*
1243 * clean up after reading from the transports list
1244 */
1245 static void nfs_server_list_stop(struct seq_file *p, void *v)
1246 {
1247 spin_unlock(&nfs_client_lock);
1248 }
1249
1250 /*
1251 * display a header line followed by a load of call lines
1252 */
1253 static int nfs_server_list_show(struct seq_file *m, void *v)
1254 {
1255 struct nfs_client *clp;
1256
1257 /* display header on line 1 */
1258 if (v == &nfs_client_list) {
1259 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1260 return 0;
1261 }
1262
1263 /* display one transport per line on subsequent lines */
1264 clp = list_entry(v, struct nfs_client, cl_share_link);
1265
1266 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n",
1267 clp->cl_nfsversion,
1268 NIPQUAD(clp->cl_addr.sin_addr),
1269 ntohs(clp->cl_addr.sin_port),
1270 atomic_read(&clp->cl_count),
1271 clp->cl_hostname);
1272
1273 return 0;
1274 }
1275
1276 /*
1277 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1278 */
1279 static int nfs_volume_list_open(struct inode *inode, struct file *file)
1280 {
1281 struct seq_file *m;
1282 int ret;
1283
1284 ret = seq_open(file, &nfs_volume_list_ops);
1285 if (ret < 0)
1286 return ret;
1287
1288 m = file->private_data;
1289 m->private = PDE(inode)->data;
1290
1291 return 0;
1292 }
1293
1294 /*
1295 * set up the iterator to start reading from the volume list and return the first item
1296 */
1297 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1298 {
1299 /* lock the list against modification */
1300 spin_lock(&nfs_client_lock);
1301 return seq_list_start_head(&nfs_volume_list, *_pos);
1302 }
1303
1304 /*
1305 * move to next volume
1306 */
1307 static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1308 {
1309 return seq_list_next(v, &nfs_volume_list, pos);
1310 }
1311
1312 /*
1313 * clean up after reading from the transports list
1314 */
1315 static void nfs_volume_list_stop(struct seq_file *p, void *v)
1316 {
1317 spin_unlock(&nfs_client_lock);
1318 }
1319
1320 /*
1321 * display a header line followed by a load of call lines
1322 */
1323 static int nfs_volume_list_show(struct seq_file *m, void *v)
1324 {
1325 struct nfs_server *server;
1326 struct nfs_client *clp;
1327 char dev[8], fsid[17];
1328
1329 /* display header on line 1 */
1330 if (v == &nfs_volume_list) {
1331 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1332 return 0;
1333 }
1334 /* display one transport per line on subsequent lines */
1335 server = list_entry(v, struct nfs_server, master_link);
1336 clp = server->nfs_client;
1337
1338 snprintf(dev, 8, "%u:%u",
1339 MAJOR(server->s_dev), MINOR(server->s_dev));
1340
1341 snprintf(fsid, 17, "%llx:%llx",
1342 (unsigned long long) server->fsid.major,
1343 (unsigned long long) server->fsid.minor);
1344
1345 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
1346 clp->cl_nfsversion,
1347 NIPQUAD(clp->cl_addr.sin_addr),
1348 ntohs(clp->cl_addr.sin_port),
1349 dev,
1350 fsid);
1351
1352 return 0;
1353 }
1354
1355 /*
1356 * initialise the /proc/fs/nfsfs/ directory
1357 */
1358 int __init nfs_fs_proc_init(void)
1359 {
1360 struct proc_dir_entry *p;
1361
1362 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1363 if (!proc_fs_nfs)
1364 goto error_0;
1365
1366 proc_fs_nfs->owner = THIS_MODULE;
1367
1368 /* a file of servers with which we're dealing */
1369 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1370 if (!p)
1371 goto error_1;
1372
1373 p->proc_fops = &nfs_server_list_fops;
1374 p->owner = THIS_MODULE;
1375
1376 /* a file of volumes that we have mounted */
1377 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1378 if (!p)
1379 goto error_2;
1380
1381 p->proc_fops = &nfs_volume_list_fops;
1382 p->owner = THIS_MODULE;
1383 return 0;
1384
1385 error_2:
1386 remove_proc_entry("servers", proc_fs_nfs);
1387 error_1:
1388 remove_proc_entry("nfsfs", proc_root_fs);
1389 error_0:
1390 return -ENOMEM;
1391 }
1392
1393 /*
1394 * clean up the /proc/fs/nfsfs/ directory
1395 */
1396 void nfs_fs_proc_exit(void)
1397 {
1398 remove_proc_entry("volumes", proc_fs_nfs);
1399 remove_proc_entry("servers", proc_fs_nfs);
1400 remove_proc_entry("nfsfs", proc_root_fs);
1401 }
1402
1403 #endif /* CONFIG_PROC_FS */
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