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LOCKD: Convert to use new rpc_create() API
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / client.c
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24c8dbbb
DH		 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/config.h>
14#include <linux/module.h>
15#include <linux/init.h>
16
17#include <linux/time.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/string.h>
21#include <linux/stat.h>
22#include <linux/errno.h>
23#include <linux/unistd.h>
24#include <linux/sunrpc/clnt.h>
25#include <linux/sunrpc/stats.h>
26#include <linux/sunrpc/metrics.h>
27#include <linux/nfs_fs.h>
28#include <linux/nfs_mount.h>
29#include <linux/nfs4_mount.h>
30#include <linux/lockd/bind.h>
31#include <linux/smp_lock.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
49static DEFINE_SPINLOCK(nfs_client_lock);
50static LIST_HEAD(nfs_client_list);
54ceac45 51static LIST_HEAD(nfs_volume_list);
24c8dbbb
DH		 52static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
53
5006a76c
DH		 54/*
55 * RPC cruft for NFS
56 */
57static 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
67struct 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
76struct rpc_stat nfs_rpcstat = {
77 .program = &nfs_program
78};
79
80
81#ifdef CONFIG_NFS_V3_ACL
82static struct rpc_stat nfsacl_rpcstat = { &nfsacl_program };
83static struct rpc_version * nfsacl_version[] = {
84 [3] = &nfsacl_version3,
85};
86
87struct 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
24c8dbbb
DH		 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 */
102static 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 int error;
108
109 if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
110 goto error_0;
111
112 error = rpciod_up();
113 if (error < 0) {
114 dprintk("%s: couldn't start rpciod! Error = %d\n",
115 __FUNCTION__, error);
24c8dbbb
DH		 116 goto error_1;
117 }
9c5bf38d 118 __set_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
24c8dbbb
DH		 119
120 if (nfsversion == 4) {
121 if (nfs_callback_up() < 0)
122 goto error_2;
123 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
124 }
125
126 atomic_set(&clp->cl_count, 1);
127 clp->cl_cons_state = NFS_CS_INITING;
128
129 clp->cl_nfsversion = nfsversion;
130 memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
131
132 if (hostname) {
133 clp->cl_hostname = kstrdup(hostname, GFP_KERNEL);
134 if (!clp->cl_hostname)
135 goto error_3;
136 }
137
138 INIT_LIST_HEAD(&clp->cl_superblocks);
139 clp->cl_rpcclient = ERR_PTR(-EINVAL);
140
141#ifdef CONFIG_NFS_V4
142 init_rwsem(&clp->cl_sem);
143 INIT_LIST_HEAD(&clp->cl_delegations);
144 INIT_LIST_HEAD(&clp->cl_state_owners);
145 INIT_LIST_HEAD(&clp->cl_unused);
146 spin_lock_init(&clp->cl_lock);
147 INIT_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
148 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
149 clp->cl_boot_time = CURRENT_TIME;
150 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
151#endif
152
153 return clp;
154
155error_3:
9c5bf38d
TM		 156 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
157 nfs_callback_down();
24c8dbbb
DH		 158error_2:
159 rpciod_down();
160 __clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state);
161error_1:
162 kfree(clp);
163error_0:
164 return NULL;
165}
166
167/*
168 * Destroy a shared client record
169 */
170static void nfs_free_client(struct nfs_client *clp)
171{
172 dprintk("--> nfs_free_client(%d)\n", clp->cl_nfsversion);
173
174#ifdef CONFIG_NFS_V4
175 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) {
176 while (!list_empty(&clp->cl_unused)) {
177 struct nfs4_state_owner *sp;
178
179 sp = list_entry(clp->cl_unused.next,
180 struct nfs4_state_owner,
181 so_list);
182 list_del(&sp->so_list);
183 kfree(sp);
184 }
185 BUG_ON(!list_empty(&clp->cl_state_owners));
186 nfs_idmap_delete(clp);
187 }
188#endif
189
190 /* -EIO all pending I/O */
191 if (!IS_ERR(clp->cl_rpcclient))
192 rpc_shutdown_client(clp->cl_rpcclient);
193
194 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
195 nfs_callback_down();
196
197 if (__test_and_clear_bit(NFS_CS_RPCIOD, &clp->cl_res_state))
9c5bf38d 198 rpciod_down();
24c8dbbb
DH		 199
200 kfree(clp->cl_hostname);
201 kfree(clp);
202
203 dprintk("<-- nfs_free_client()\n");
204}
205
206/*
207 * Release a reference to a shared client record
208 */
209void nfs_put_client(struct nfs_client *clp)
210{
27ba8512
DH		 211 if (!clp)
212 return;
213
24c8dbbb
DH		 214 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp->cl_count));
215
216 if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
217 list_del(&clp->cl_share_link);
218 spin_unlock(&nfs_client_lock);
219
220 BUG_ON(!list_empty(&clp->cl_superblocks));
221
222 nfs_free_client(clp);
223 }
224}
225
226/*
227 * Find a client by address
228 * - caller must hold nfs_client_lock
229 */
230static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
231{
232 struct nfs_client *clp;
233
234 list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
235 /* Different NFS versions cannot share the same nfs_client */
236 if (clp->cl_nfsversion != nfsversion)
237 continue;
238
239 if (memcmp(&clp->cl_addr.sin_addr, &addr->sin_addr,
240 sizeof(clp->cl_addr.sin_addr)) != 0)
241 continue;
242
243 if (clp->cl_addr.sin_port == addr->sin_port)
244 goto found;
245 }
246
247 return NULL;
248
249found:
250 atomic_inc(&clp->cl_count);
251 return clp;
252}
253
254/*
255 * Find a client by IP address and protocol version
256 * - returns NULL if no such client
257 */
258struct nfs_client *nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
259{
260 struct nfs_client *clp;
261
262 spin_lock(&nfs_client_lock);
263 clp = __nfs_find_client(addr, nfsversion);
264 spin_unlock(&nfs_client_lock);
265
266 BUG_ON(clp->cl_cons_state == 0);
267
268 return clp;
269}
270
271/*
272 * Look up a client by IP address and protocol version
273 * - creates a new record if one doesn't yet exist
274 */
54ceac45
DH		 275static struct nfs_client *nfs_get_client(const char *hostname,
276 const struct sockaddr_in *addr,
277 int nfsversion)
24c8dbbb
DH		 278{
279 struct nfs_client *clp, *new = NULL;
280 int error;
281
282 dprintk("--> nfs_get_client(%s,"NIPQUAD_FMT":%d,%d)\n",
283 hostname ?: "", NIPQUAD(addr->sin_addr),
284 addr->sin_port, nfsversion);
285
286 /* see if the client already exists */
287 do {
288 spin_lock(&nfs_client_lock);
289
290 clp = __nfs_find_client(addr, nfsversion);
291 if (clp)
292 goto found_client;
293 if (new)
294 goto install_client;
295
296 spin_unlock(&nfs_client_lock);
297
298 new = nfs_alloc_client(hostname, addr, nfsversion);
299 } while (new);
300
301 return ERR_PTR(-ENOMEM);
302
303 /* install a new client and return with it unready */
304install_client:
305 clp = new;
306 list_add(&clp->cl_share_link, &nfs_client_list);
307 spin_unlock(&nfs_client_lock);
308 dprintk("--> nfs_get_client() = %p [new]\n", clp);
309 return clp;
310
311 /* found an existing client
312 * - make sure it's ready before returning
313 */
314found_client:
315 spin_unlock(&nfs_client_lock);
316
317 if (new)
318 nfs_free_client(new);
319
320 if (clp->cl_cons_state == NFS_CS_INITING) {
321 DECLARE_WAITQUEUE(myself, current);
322
323 add_wait_queue(&nfs_client_active_wq, &myself);
324
325 for (;;) {
326 set_current_state(TASK_INTERRUPTIBLE);
327 if (signal_pending(current) ||
328 clp->cl_cons_state > NFS_CS_READY)
329 break;
330 schedule();
331 }
332
333 remove_wait_queue(&nfs_client_active_wq, &myself);
334
335 if (signal_pending(current)) {
336 nfs_put_client(clp);
337 return ERR_PTR(-ERESTARTSYS);
338 }
339 }
340
341 if (clp->cl_cons_state < NFS_CS_READY) {
342 error = clp->cl_cons_state;
343 nfs_put_client(clp);
344 return ERR_PTR(error);
345 }
346
54ceac45
DH		 347 BUG_ON(clp->cl_cons_state != NFS_CS_READY);
348
24c8dbbb
DH		 349 dprintk("--> nfs_get_client() = %p [share]\n", clp);
350 return clp;
351}
352
353/*
354 * Mark a server as ready or failed
355 */
54ceac45 356static void nfs_mark_client_ready(struct nfs_client *clp, int state)
24c8dbbb
DH		 357{
358 clp->cl_cons_state = state;
359 wake_up_all(&nfs_client_active_wq);
360}
5006a76c
DH		 361
362/*
363 * Initialise the timeout values for a connection
364 */
365static void nfs_init_timeout_values(struct rpc_timeout *to, int proto,
366 unsigned int timeo, unsigned int retrans)
367{
368 to->to_initval = timeo * HZ / 10;
369 to->to_retries = retrans;
370 if (!to->to_retries)
371 to->to_retries = 2;
372
373 switch (proto) {
374 case IPPROTO_TCP:
375 if (!to->to_initval)
376 to->to_initval = 60 * HZ;
377 if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
378 to->to_initval = NFS_MAX_TCP_TIMEOUT;
379 to->to_increment = to->to_initval;
380 to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
381 to->to_exponential = 0;
382 break;
383 case IPPROTO_UDP:
384 default:
385 if (!to->to_initval)
386 to->to_initval = 11 * HZ / 10;
387 if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
388 to->to_initval = NFS_MAX_UDP_TIMEOUT;
389 to->to_maxval = NFS_MAX_UDP_TIMEOUT;
390 to->to_exponential = 1;
391 break;
392 }
393}
394
395/*
396 * Create an RPC client handle
397 */
54ceac45
DH		 398static int nfs_create_rpc_client(struct nfs_client *clp, int proto,
399 unsigned int timeo,
400 unsigned int retrans,
401 rpc_authflavor_t flavor)
5006a76c
DH		 402{
403 struct rpc_timeout timeparms;
404 struct rpc_xprt *xprt = NULL;
405 struct rpc_clnt *clnt = NULL;
406
407 if (!IS_ERR(clp->cl_rpcclient))
408 return 0;
409
410 nfs_init_timeout_values(&timeparms, proto, timeo, retrans);
411 clp->retrans_timeo = timeparms.to_initval;
412 clp->retrans_count = timeparms.to_retries;
413
414 /* create transport and client */
415 xprt = xprt_create_proto(proto, &clp->cl_addr, &timeparms);
416 if (IS_ERR(xprt)) {
417 dprintk("%s: cannot create RPC transport. Error = %ld\n",
418 __FUNCTION__, PTR_ERR(xprt));
419 return PTR_ERR(xprt);
420 }
421
422 /* Bind to a reserved port! */
423 xprt->resvport = 1;
424 /* Create the client RPC handle */
425 clnt = rpc_create_client(xprt, clp->cl_hostname, &nfs_program,
426 clp->rpc_ops->version, RPC_AUTH_UNIX);
427 if (IS_ERR(clnt)) {
428 dprintk("%s: cannot create RPC client. Error = %ld\n",
429 __FUNCTION__, PTR_ERR(clnt));
430 return PTR_ERR(clnt);
431 }
432
433 clnt->cl_intr = 1;
434 clnt->cl_softrtry = 1;
435 clp->cl_rpcclient = clnt;
436 return 0;
437}
54ceac45
DH		 438
439/*
440 * Version 2 or 3 client destruction
441 */
442static void nfs_destroy_server(struct nfs_server *server)
443{
444 if (!IS_ERR(server->client_acl))
445 rpc_shutdown_client(server->client_acl);
446
447 if (!(server->flags & NFS_MOUNT_NONLM))
448 lockd_down(); /* release rpc.lockd */
449}
450
451/*
452 * Version 2 or 3 lockd setup
453 */
454static int nfs_start_lockd(struct nfs_server *server)
455{
456 int error = 0;
457
458 if (server->nfs_client->cl_nfsversion > 3)
459 goto out;
460 if (server->flags & NFS_MOUNT_NONLM)
461 goto out;
462 error = lockd_up();
463 if (error < 0)
464 server->flags |= NFS_MOUNT_NONLM;
465 else
466 server->destroy = nfs_destroy_server;
467out:
468 return error;
469}
470
471/*
472 * Initialise an NFSv3 ACL client connection
473 */
474#ifdef CONFIG_NFS_V3_ACL
475static void nfs_init_server_aclclient(struct nfs_server *server)
476{
477 if (server->nfs_client->cl_nfsversion != 3)
478 goto out_noacl;
479 if (server->flags & NFS_MOUNT_NOACL)
480 goto out_noacl;
481
482 server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
483 if (IS_ERR(server->client_acl))
484 goto out_noacl;
485
486 /* No errors! Assume that Sun nfsacls are supported */
487 server->caps |= NFS_CAP_ACLS;
488 return;
489
490out_noacl:
491 server->caps &= ~NFS_CAP_ACLS;
492}
493#else
494static inline void nfs_init_server_aclclient(struct nfs_server *server)
495{
496 server->flags &= ~NFS_MOUNT_NOACL;
497 server->caps &= ~NFS_CAP_ACLS;
498}
499#endif
500
501/*
502 * Create a general RPC client
503 */
504static int nfs_init_server_rpcclient(struct nfs_server *server, rpc_authflavor_t pseudoflavour)
505{
506 struct nfs_client *clp = server->nfs_client;
507
508 server->client = rpc_clone_client(clp->cl_rpcclient);
509 if (IS_ERR(server->client)) {
510 dprintk("%s: couldn't create rpc_client!\n", __FUNCTION__);
511 return PTR_ERR(server->client);
512 }
513
514 if (pseudoflavour != clp->cl_rpcclient->cl_auth->au_flavor) {
515 struct rpc_auth *auth;
516
517 auth = rpcauth_create(pseudoflavour, server->client);
518 if (IS_ERR(auth)) {
519 dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
520 return PTR_ERR(auth);
521 }
522 }
523 server->client->cl_softrtry = 0;
524 if (server->flags & NFS_MOUNT_SOFT)
525 server->client->cl_softrtry = 1;
526
527 server->client->cl_intr = 0;
528 if (server->flags & NFS4_MOUNT_INTR)
529 server->client->cl_intr = 1;
530
531 return 0;
532}
533
534/*
535 * Initialise an NFS2 or NFS3 client
536 */
537static int nfs_init_client(struct nfs_client *clp, const struct nfs_mount_data *data)
538{
539 int proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
540 int error;
541
542 if (clp->cl_cons_state == NFS_CS_READY) {
543 /* the client is already initialised */
544 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp);
545 return 0;
546 }
547
548 /* Check NFS protocol revision and initialize RPC op vector */
549 clp->rpc_ops = &nfs_v2_clientops;
550#ifdef CONFIG_NFS_V3
551 if (clp->cl_nfsversion == 3)
552 clp->rpc_ops = &nfs_v3_clientops;
553#endif
554 /*
555 * Create a client RPC handle for doing FSSTAT with UNIX auth only
556 * - RFC 2623, sec 2.3.2
557 */
558 error = nfs_create_rpc_client(clp, proto, data->timeo, data->retrans,
559 RPC_AUTH_UNIX);
560 if (error < 0)
561 goto error;
562 nfs_mark_client_ready(clp, NFS_CS_READY);
563 return 0;
564
565error:
566 nfs_mark_client_ready(clp, error);
567 dprintk("<-- nfs_init_client() = xerror %d\n", error);
568 return error;
569}
570
571/*
572 * Create a version 2 or 3 client
573 */
574static int nfs_init_server(struct nfs_server *server, const struct nfs_mount_data *data)
575{
576 struct nfs_client *clp;
577 int error, nfsvers = 2;
578
579 dprintk("--> nfs_init_server()\n");
580
581#ifdef CONFIG_NFS_V3
582 if (data->flags & NFS_MOUNT_VER3)
583 nfsvers = 3;
584#endif
585
586 /* Allocate or find a client reference we can use */
587 clp = nfs_get_client(data->hostname, &data->addr, nfsvers);
588 if (IS_ERR(clp)) {
589 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp));
590 return PTR_ERR(clp);
591 }
592
593 error = nfs_init_client(clp, data);
594 if (error < 0)
595 goto error;
596
597 server->nfs_client = clp;
598
599 /* Initialise the client representation from the mount data */
600 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
601
602 if (data->rsize)
603 server->rsize = nfs_block_size(data->rsize, NULL);
604 if (data->wsize)
605 server->wsize = nfs_block_size(data->wsize, NULL);
606
607 server->acregmin = data->acregmin * HZ;
608 server->acregmax = data->acregmax * HZ;
609 server->acdirmin = data->acdirmin * HZ;
610 server->acdirmax = data->acdirmax * HZ;
611
612 /* Start lockd here, before we might error out */
613 error = nfs_start_lockd(server);
614 if (error < 0)
615 goto error;
616
617 error = nfs_init_server_rpcclient(server, data->pseudoflavor);
618 if (error < 0)
619 goto error;
620
621 server->namelen = data->namlen;
622 /* Create a client RPC handle for the NFSv3 ACL management interface */
623 nfs_init_server_aclclient(server);
624 if (clp->cl_nfsversion == 3) {
625 if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
626 server->namelen = NFS3_MAXNAMLEN;
627 server->caps |= NFS_CAP_READDIRPLUS;
628 } else {
629 if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
630 server->namelen = NFS2_MAXNAMLEN;
631 }
632
633 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
634 return 0;
635
636error:
637 server->nfs_client = NULL;
638 nfs_put_client(clp);
639 dprintk("<-- nfs_init_server() = xerror %d\n", error);
640 return error;
641}
642
643/*
644 * Load up the server record from information gained in an fsinfo record
645 */
646static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *fsinfo)
647{
648 unsigned long max_rpc_payload;
649
650 /* Work out a lot of parameters */
651 if (server->rsize == 0)
652 server->rsize = nfs_block_size(fsinfo->rtpref, NULL);
653 if (server->wsize == 0)
654 server->wsize = nfs_block_size(fsinfo->wtpref, NULL);
655
656 if (fsinfo->rtmax >= 512 && server->rsize > fsinfo->rtmax)
657 server->rsize = nfs_block_size(fsinfo->rtmax, NULL);
658 if (fsinfo->wtmax >= 512 && server->wsize > fsinfo->wtmax)
659 server->wsize = nfs_block_size(fsinfo->wtmax, NULL);
660
661 max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
662 if (server->rsize > max_rpc_payload)
663 server->rsize = max_rpc_payload;
664 if (server->rsize > NFS_MAX_FILE_IO_SIZE)
665 server->rsize = NFS_MAX_FILE_IO_SIZE;
666 server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
667 server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
668
669 if (server->wsize > max_rpc_payload)
670 server->wsize = max_rpc_payload;
671 if (server->wsize > NFS_MAX_FILE_IO_SIZE)
672 server->wsize = NFS_MAX_FILE_IO_SIZE;
673 server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
674 server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
675
676 server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
677 if (server->dtsize > PAGE_CACHE_SIZE)
678 server->dtsize = PAGE_CACHE_SIZE;
679 if (server->dtsize > server->rsize)
680 server->dtsize = server->rsize;
681
682 if (server->flags & NFS_MOUNT_NOAC) {
683 server->acregmin = server->acregmax = 0;
684 server->acdirmin = server->acdirmax = 0;
685 }
686
687 server->maxfilesize = fsinfo->maxfilesize;
688
689 /* We're airborne Set socket buffersize */
690 rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
691}
692
693/*
694 * Probe filesystem information, including the FSID on v2/v3
695 */
696static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs_fattr *fattr)
697{
698 struct nfs_fsinfo fsinfo;
699 struct nfs_client *clp = server->nfs_client;
700 int error;
701
702 dprintk("--> nfs_probe_fsinfo()\n");
703
704 if (clp->rpc_ops->set_capabilities != NULL) {
705 error = clp->rpc_ops->set_capabilities(server, mntfh);
706 if (error < 0)
707 goto out_error;
708 }
709
710 fsinfo.fattr = fattr;
711 nfs_fattr_init(fattr);
712 error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
713 if (error < 0)
714 goto out_error;
715
716 nfs_server_set_fsinfo(server, &fsinfo);
717
718 /* Get some general file system info */
719 if (server->namelen == 0) {
720 struct nfs_pathconf pathinfo;
721
722 pathinfo.fattr = fattr;
723 nfs_fattr_init(fattr);
724
725 if (clp->rpc_ops->pathconf(server, mntfh, &pathinfo) >= 0)
726 server->namelen = pathinfo.max_namelen;
727 }
728
729 dprintk("<-- nfs_probe_fsinfo() = 0\n");
730 return 0;
731
732out_error:
733 dprintk("nfs_probe_fsinfo: error = %d\n", -error);
734 return error;
735}
736
737/*
738 * Copy useful information when duplicating a server record
739 */
740static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *source)
741{
742 target->flags = source->flags;
743 target->acregmin = source->acregmin;
744 target->acregmax = source->acregmax;
745 target->acdirmin = source->acdirmin;
746 target->acdirmax = source->acdirmax;
747 target->caps = source->caps;
748}
749
750/*
751 * Allocate and initialise a server record
752 */
753static struct nfs_server *nfs_alloc_server(void)
754{
755 struct nfs_server *server;
756
757 server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
758 if (!server)
759 return NULL;
760
761 server->client = server->client_acl = ERR_PTR(-EINVAL);
762
763 /* Zero out the NFS state stuff */
764 INIT_LIST_HEAD(&server->client_link);
765 INIT_LIST_HEAD(&server->master_link);
766
767 server->io_stats = nfs_alloc_iostats();
768 if (!server->io_stats) {
769 kfree(server);
770 return NULL;
771 }
772
773 return server;
774}
775
776/*
777 * Free up a server record
778 */
779void nfs_free_server(struct nfs_server *server)
780{
781 dprintk("--> nfs_free_server()\n");
782
783 spin_lock(&nfs_client_lock);
784 list_del(&server->client_link);
785 list_del(&server->master_link);
786 spin_unlock(&nfs_client_lock);
787
788 if (server->destroy != NULL)
789 server->destroy(server);
790 if (!IS_ERR(server->client))
791 rpc_shutdown_client(server->client);
792
793 nfs_put_client(server->nfs_client);
794
795 nfs_free_iostats(server->io_stats);
796 kfree(server);
797 nfs_release_automount_timer();
798 dprintk("<-- nfs_free_server()\n");
799}
800
801/*
802 * Create a version 2 or 3 volume record
803 * - keyed on server and FSID
804 */
805struct nfs_server *nfs_create_server(const struct nfs_mount_data *data,
806 struct nfs_fh *mntfh)
807{
808 struct nfs_server *server;
809 struct nfs_fattr fattr;
810 int error;
811
812 server = nfs_alloc_server();
813 if (!server)
814 return ERR_PTR(-ENOMEM);
815
816 /* Get a client representation */
817 error = nfs_init_server(server, data);
818 if (error < 0)
819 goto error;
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 /* Probe the root fh to retrieve its FSID */
826 error = nfs_probe_fsinfo(server, mntfh, &fattr);
827 if (error < 0)
828 goto error;
829 if (!(fattr.valid & NFS_ATTR_FATTR)) {
830 error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
831 if (error < 0) {
832 dprintk("nfs_create_server: getattr error = %d\n", -error);
833 goto error;
834 }
835 }
836 memcpy(&server->fsid, &fattr.fsid, sizeof(server->fsid));
837
838 dprintk("Server FSID: %llx:%llx\n", server->fsid.major, server->fsid.minor);
839
840 BUG_ON(!server->nfs_client);
841 BUG_ON(!server->nfs_client->rpc_ops);
842 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
843
844 spin_lock(&nfs_client_lock);
845 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
846 list_add_tail(&server->master_link, &nfs_volume_list);
847 spin_unlock(&nfs_client_lock);
848
849 server->mount_time = jiffies;
850 return server;
851
852error:
853 nfs_free_server(server);
854 return ERR_PTR(error);
855}
856
857#ifdef CONFIG_NFS_V4
858/*
859 * Initialise an NFS4 client record
860 */
861static int nfs4_init_client(struct nfs_client *clp,
862 int proto, int timeo, int retrans,
863 rpc_authflavor_t authflavour)
864{
865 int error;
866
867 if (clp->cl_cons_state == NFS_CS_READY) {
868 /* the client is initialised already */
869 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp);
870 return 0;
871 }
872
873 /* Check NFS protocol revision and initialize RPC op vector */
874 clp->rpc_ops = &nfs_v4_clientops;
875
876 error = nfs_create_rpc_client(clp, proto, timeo, retrans, authflavour);
877 if (error < 0)
878 goto error;
879
880 error = nfs_idmap_new(clp);
881 if (error < 0) {
882 dprintk("%s: failed to create idmapper. Error = %d\n",
883 __FUNCTION__, error);
54ceac45
DH		 884 goto error;
885 }
9c5bf38d 886 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
54ceac45
DH		 887
888 nfs_mark_client_ready(clp, NFS_CS_READY);
889 return 0;
890
891error:
892 nfs_mark_client_ready(clp, error);
893 dprintk("<-- nfs4_init_client() = xerror %d\n", error);
894 return error;
895}
896
897/*
898 * Set up an NFS4 client
899 */
900static int nfs4_set_client(struct nfs_server *server,
901 const char *hostname, const struct sockaddr_in *addr,
902 rpc_authflavor_t authflavour,
903 int proto, int timeo, int retrans)
904{
905 struct nfs_client *clp;
906 int error;
907
908 dprintk("--> nfs4_set_client()\n");
909
910 /* Allocate or find a client reference we can use */
911 clp = nfs_get_client(hostname, addr, 4);
912 if (IS_ERR(clp)) {
913 error = PTR_ERR(clp);
914 goto error;
915 }
916 error = nfs4_init_client(clp, proto, timeo, retrans, authflavour);
917 if (error < 0)
918 goto error_put;
919
920 server->nfs_client = clp;
921 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp);
922 return 0;
923
924error_put:
925 nfs_put_client(clp);
926error:
927 dprintk("<-- nfs4_set_client() = xerror %d\n", error);
928 return error;
929}
930
931/*
932 * Create a version 4 volume record
933 */
934static int nfs4_init_server(struct nfs_server *server,
935 const struct nfs4_mount_data *data, rpc_authflavor_t authflavour)
936{
937 int error;
938
939 dprintk("--> nfs4_init_server()\n");
940
941 /* Initialise the client representation from the mount data */
942 server->flags = data->flags & NFS_MOUNT_FLAGMASK;
943 server->caps |= NFS_CAP_ATOMIC_OPEN;
944
945 if (data->rsize)
946 server->rsize = nfs_block_size(data->rsize, NULL);
947 if (data->wsize)
948 server->wsize = nfs_block_size(data->wsize, NULL);
949
950 server->acregmin = data->acregmin * HZ;
951 server->acregmax = data->acregmax * HZ;
952 server->acdirmin = data->acdirmin * HZ;
953 server->acdirmax = data->acdirmax * HZ;
954
955 error = nfs_init_server_rpcclient(server, authflavour);
956
957 /* Done */
958 dprintk("<-- nfs4_init_server() = %d\n", error);
959 return error;
960}
961
962/*
963 * Create a version 4 volume record
964 * - keyed on server and FSID
965 */
966struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *data,
967 const char *hostname,
968 const struct sockaddr_in *addr,
969 const char *mntpath,
970 const char *ip_addr,
971 rpc_authflavor_t authflavour,
972 struct nfs_fh *mntfh)
973{
974 struct nfs_fattr fattr;
975 struct nfs_server *server;
976 int error;
977
978 dprintk("--> nfs4_create_server()\n");
979
980 server = nfs_alloc_server();
981 if (!server)
982 return ERR_PTR(-ENOMEM);
983
984 /* Get a client record */
985 error = nfs4_set_client(server, hostname, addr, authflavour,
986 data->proto, data->timeo, data->retrans);
987 if (error < 0)
988 goto error;
989
990 /* set up the general RPC client */
991 error = nfs4_init_server(server, data, authflavour);
992 if (error < 0)
993 goto error;
994
995 BUG_ON(!server->nfs_client);
996 BUG_ON(!server->nfs_client->rpc_ops);
997 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
998
999 /* Probe the root fh to retrieve its FSID */
1000 error = nfs4_path_walk(server, mntfh, mntpath);
1001 if (error < 0)
1002 goto error;
1003
1004 dprintk("Server FSID: %llx:%llx\n", server->fsid.major, server->fsid.minor);
1005 dprintk("Mount FH: %d\n", mntfh->size);
1006
1007 error = nfs_probe_fsinfo(server, mntfh, &fattr);
1008 if (error < 0)
1009 goto error;
1010
1011 BUG_ON(!server->nfs_client);
1012 BUG_ON(!server->nfs_client->rpc_ops);
1013 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1014
1015 spin_lock(&nfs_client_lock);
1016 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1017 list_add_tail(&server->master_link, &nfs_volume_list);
1018 spin_unlock(&nfs_client_lock);
1019
1020 server->mount_time = jiffies;
1021 dprintk("<-- nfs4_create_server() = %p\n", server);
1022 return server;
1023
1024error:
1025 nfs_free_server(server);
1026 dprintk("<-- nfs4_create_server() = error %d\n", error);
1027 return ERR_PTR(error);
1028}
1029
1030/*
1031 * Create an NFS4 referral server record
1032 */
1033struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1034 struct nfs_fh *fh)
1035{
1036 struct nfs_client *parent_client;
1037 struct nfs_server *server, *parent_server;
1038 struct nfs_fattr fattr;
1039 int error;
1040
1041 dprintk("--> nfs4_create_referral_server()\n");
1042
1043 server = nfs_alloc_server();
1044 if (!server)
1045 return ERR_PTR(-ENOMEM);
1046
1047 parent_server = NFS_SB(data->sb);
1048 parent_client = parent_server->nfs_client;
1049
1050 /* Get a client representation.
1051 * Note: NFSv4 always uses TCP, */
1052 error = nfs4_set_client(server, data->hostname, data->addr,
1053 data->authflavor,
1054 parent_server->client->cl_xprt->prot,
1055 parent_client->retrans_timeo,
1056 parent_client->retrans_count);
1057
1058 /* Initialise the client representation from the parent server */
1059 nfs_server_copy_userdata(server, parent_server);
1060 server->caps |= NFS_CAP_ATOMIC_OPEN;
1061
1062 error = nfs_init_server_rpcclient(server, data->authflavor);
1063 if (error < 0)
1064 goto error;
1065
1066 BUG_ON(!server->nfs_client);
1067 BUG_ON(!server->nfs_client->rpc_ops);
1068 BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
1069
1070 /* probe the filesystem info for this server filesystem */
1071 error = nfs_probe_fsinfo(server, fh, &fattr);
1072 if (error < 0)
1073 goto error;
1074
1075 dprintk("Referral FSID: %llx:%llx\n",
1076 server->fsid.major, server->fsid.minor);
1077
1078 spin_lock(&nfs_client_lock);
1079 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1080 list_add_tail(&server->master_link, &nfs_volume_list);
1081 spin_unlock(&nfs_client_lock);
1082
1083 server->mount_time = jiffies;
1084
1085 dprintk("<-- nfs_create_referral_server() = %p\n", server);
1086 return server;
1087
1088error:
1089 nfs_free_server(server);
1090 dprintk("<-- nfs4_create_referral_server() = error %d\n", error);
1091 return ERR_PTR(error);
1092}
1093
1094#endif /* CONFIG_NFS_V4 */
1095
1096/*
1097 * Clone an NFS2, NFS3 or NFS4 server record
1098 */
1099struct nfs_server *nfs_clone_server(struct nfs_server *source,
1100 struct nfs_fh *fh,
1101 struct nfs_fattr *fattr)
1102{
1103 struct nfs_server *server;
1104 struct nfs_fattr fattr_fsinfo;
1105 int error;
1106
1107 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1108 fattr->fsid.major, fattr->fsid.minor);
1109
1110 server = nfs_alloc_server();
1111 if (!server)
1112 return ERR_PTR(-ENOMEM);
1113
1114 /* Copy data from the source */
1115 server->nfs_client = source->nfs_client;
1116 atomic_inc(&server->nfs_client->cl_count);
1117 nfs_server_copy_userdata(server, source);
1118
1119 server->fsid = fattr->fsid;
1120
1121 error = nfs_init_server_rpcclient(server, source->client->cl_auth->au_flavor);
1122 if (error < 0)
1123 goto out_free_server;
1124 if (!IS_ERR(source->client_acl))
1125 nfs_init_server_aclclient(server);
1126
1127 /* probe the filesystem info for this server filesystem */
1128 error = nfs_probe_fsinfo(server, fh, &fattr_fsinfo);
1129 if (error < 0)
1130 goto out_free_server;
1131
1132 dprintk("Cloned FSID: %llx:%llx\n",
1133 server->fsid.major, server->fsid.minor);
1134
1135 error = nfs_start_lockd(server);
1136 if (error < 0)
1137 goto out_free_server;
1138
1139 spin_lock(&nfs_client_lock);
1140 list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
1141 list_add_tail(&server->master_link, &nfs_volume_list);
1142 spin_unlock(&nfs_client_lock);
1143
1144 server->mount_time = jiffies;
1145
1146 dprintk("<-- nfs_clone_server() = %p\n", server);
1147 return server;
1148
1149out_free_server:
1150 nfs_free_server(server);
1151 dprintk("<-- nfs_clone_server() = error %d\n", error);
1152 return ERR_PTR(error);
1153}
6aaca566
DH		 1154
1155#ifdef CONFIG_PROC_FS
1156static struct proc_dir_entry *proc_fs_nfs;
1157
1158static int nfs_server_list_open(struct inode *inode, struct file *file);
1159static void *nfs_server_list_start(struct seq_file *p, loff_t *pos);
1160static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos);
1161static void nfs_server_list_stop(struct seq_file *p, void *v);
1162static int nfs_server_list_show(struct seq_file *m, void *v);
1163
1164static struct seq_operations nfs_server_list_ops = {
1165 .start = nfs_server_list_start,
1166 .next = nfs_server_list_next,
1167 .stop = nfs_server_list_stop,
1168 .show = nfs_server_list_show,
1169};
1170
1171static struct file_operations nfs_server_list_fops = {
1172 .open = nfs_server_list_open,
1173 .read = seq_read,
1174 .llseek = seq_lseek,
1175 .release = seq_release,
1176};
1177
1178static int nfs_volume_list_open(struct inode *inode, struct file *file);
1179static void *nfs_volume_list_start(struct seq_file *p, loff_t *pos);
1180static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos);
1181static void nfs_volume_list_stop(struct seq_file *p, void *v);
1182static int nfs_volume_list_show(struct seq_file *m, void *v);
1183
1184static struct seq_operations nfs_volume_list_ops = {
1185 .start = nfs_volume_list_start,
1186 .next = nfs_volume_list_next,
1187 .stop = nfs_volume_list_stop,
1188 .show = nfs_volume_list_show,
1189};
1190
1191static struct file_operations nfs_volume_list_fops = {
1192 .open = nfs_volume_list_open,
1193 .read = seq_read,
1194 .llseek = seq_lseek,
1195 .release = seq_release,
1196};
1197
1198/*
1199 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1200 * we're dealing
1201 */
1202static int nfs_server_list_open(struct inode *inode, struct file *file)
1203{
1204 struct seq_file *m;
1205 int ret;
1206
1207 ret = seq_open(file, &nfs_server_list_ops);
1208 if (ret < 0)
1209 return ret;
1210
1211 m = file->private_data;
1212 m->private = PDE(inode)->data;
1213
1214 return 0;
1215}
1216
1217/*
1218 * set up the iterator to start reading from the server list and return the first item
1219 */
1220static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
1221{
1222 struct list_head *_p;
1223 loff_t pos = *_pos;
1224
1225 /* lock the list against modification */
1226 spin_lock(&nfs_client_lock);
1227
1228 /* allow for the header line */
1229 if (!pos)
1230 return SEQ_START_TOKEN;
1231 pos--;
1232
1233 /* find the n'th element in the list */
1234 list_for_each(_p, &nfs_client_list)
1235 if (!pos--)
1236 break;
1237
1238 return _p != &nfs_client_list ? _p : NULL;
1239}
1240
1241/*
1242 * move to next server
1243 */
1244static void *nfs_server_list_next(struct seq_file *p, void *v, loff_t *pos)
1245{
1246 struct list_head *_p;
1247
1248 (*pos)++;
1249
1250 _p = v;
1251 _p = (v == SEQ_START_TOKEN) ? nfs_client_list.next : _p->next;
1252
1253 return _p != &nfs_client_list ? _p : NULL;
1254}
1255
1256/*
1257 * clean up after reading from the transports list
1258 */
1259static void nfs_server_list_stop(struct seq_file *p, void *v)
1260{
1261 spin_unlock(&nfs_client_lock);
1262}
1263
1264/*
1265 * display a header line followed by a load of call lines
1266 */
1267static int nfs_server_list_show(struct seq_file *m, void *v)
1268{
1269 struct nfs_client *clp;
1270
1271 /* display header on line 1 */
1272 if (v == SEQ_START_TOKEN) {
1273 seq_puts(m, "NV SERVER PORT USE HOSTNAME\n");
1274 return 0;
1275 }
1276
1277 /* display one transport per line on subsequent lines */
1278 clp = list_entry(v, struct nfs_client, cl_share_link);
1279
1280 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %3d %s\n",
1281 clp->cl_nfsversion,
1282 NIPQUAD(clp->cl_addr.sin_addr),
1283 ntohs(clp->cl_addr.sin_port),
1284 atomic_read(&clp->cl_count),
1285 clp->cl_hostname);
1286
1287 return 0;
1288}
1289
1290/*
1291 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1292 */
1293static int nfs_volume_list_open(struct inode *inode, struct file *file)
1294{
1295 struct seq_file *m;
1296 int ret;
1297
1298 ret = seq_open(file, &nfs_volume_list_ops);
1299 if (ret < 0)
1300 return ret;
1301
1302 m = file->private_data;
1303 m->private = PDE(inode)->data;
1304
1305 return 0;
1306}
1307
1308/*
1309 * set up the iterator to start reading from the volume list and return the first item
1310 */
1311static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
1312{
1313 struct list_head *_p;
1314 loff_t pos = *_pos;
1315
1316 /* lock the list against modification */
1317 spin_lock(&nfs_client_lock);
1318
1319 /* allow for the header line */
1320 if (!pos)
1321 return SEQ_START_TOKEN;
1322 pos--;
1323
1324 /* find the n'th element in the list */
1325 list_for_each(_p, &nfs_volume_list)
1326 if (!pos--)
1327 break;
1328
1329 return _p != &nfs_volume_list ? _p : NULL;
1330}
1331
1332/*
1333 * move to next volume
1334 */
1335static void *nfs_volume_list_next(struct seq_file *p, void *v, loff_t *pos)
1336{
1337 struct list_head *_p;
1338
1339 (*pos)++;
1340
1341 _p = v;
1342 _p = (v == SEQ_START_TOKEN) ? nfs_volume_list.next : _p->next;
1343
1344 return _p != &nfs_volume_list ? _p : NULL;
1345}
1346
1347/*
1348 * clean up after reading from the transports list
1349 */
1350static void nfs_volume_list_stop(struct seq_file *p, void *v)
1351{
1352 spin_unlock(&nfs_client_lock);
1353}
1354
1355/*
1356 * display a header line followed by a load of call lines
1357 */
1358static int nfs_volume_list_show(struct seq_file *m, void *v)
1359{
1360 struct nfs_server *server;
1361 struct nfs_client *clp;
1362 char dev[8], fsid[17];
1363
1364 /* display header on line 1 */
1365 if (v == SEQ_START_TOKEN) {
1366 seq_puts(m, "NV SERVER PORT DEV FSID\n");
1367 return 0;
1368 }
1369 /* display one transport per line on subsequent lines */
1370 server = list_entry(v, struct nfs_server, master_link);
1371 clp = server->nfs_client;
1372
1373 snprintf(dev, 8, "%u:%u",
1374 MAJOR(server->s_dev), MINOR(server->s_dev));
1375
1376 snprintf(fsid, 17, "%llx:%llx",
1377 server->fsid.major, server->fsid.minor);
1378
1379 seq_printf(m, "v%d %02x%02x%02x%02x %4hx %-7s %-17s\n",
1380 clp->cl_nfsversion,
1381 NIPQUAD(clp->cl_addr.sin_addr),
1382 ntohs(clp->cl_addr.sin_port),
1383 dev,
1384 fsid);
1385
1386 return 0;
1387}
1388
1389/*
1390 * initialise the /proc/fs/nfsfs/ directory
1391 */
1392int __init nfs_fs_proc_init(void)
1393{
1394 struct proc_dir_entry *p;
1395
1396 proc_fs_nfs = proc_mkdir("nfsfs", proc_root_fs);
1397 if (!proc_fs_nfs)
1398 goto error_0;
1399
1400 proc_fs_nfs->owner = THIS_MODULE;
1401
1402 /* a file of servers with which we're dealing */
1403 p = create_proc_entry("servers", S_IFREG|S_IRUGO, proc_fs_nfs);
1404 if (!p)
1405 goto error_1;
1406
1407 p->proc_fops = &nfs_server_list_fops;
1408 p->owner = THIS_MODULE;
1409
1410 /* a file of volumes that we have mounted */
1411 p = create_proc_entry("volumes", S_IFREG|S_IRUGO, proc_fs_nfs);
1412 if (!p)
1413 goto error_2;
1414
1415 p->proc_fops = &nfs_volume_list_fops;
1416 p->owner = THIS_MODULE;
1417 return 0;
1418
1419error_2:
1420 remove_proc_entry("servers", proc_fs_nfs);
1421error_1:
1422 remove_proc_entry("nfsfs", proc_root_fs);
1423error_0:
1424 return -ENOMEM;
1425}
1426
1427/*
1428 * clean up the /proc/fs/nfsfs/ directory
1429 */
1430void nfs_fs_proc_exit(void)
1431{
1432 remove_proc_entry("volumes", proc_fs_nfs);
1433 remove_proc_entry("servers", proc_fs_nfs);
1434 remove_proc_entry("nfsfs", proc_root_fs);
1435}
1436
1437#endif /* CONFIG_PROC_FS */
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