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24#include <linux/module.h>
25#include <linux/init.h>
26
27#include <linux/time.h>
28#include <linux/kernel.h>
29#include <linux/mm.h>
30#include <linux/string.h>
31#include <linux/stat.h>
32#include <linux/errno.h>
33#include <linux/unistd.h>
34#include <linux/sunrpc/clnt.h>
35#include <linux/sunrpc/addr.h>
36#include <linux/sunrpc/stats.h>
37#include <linux/sunrpc/metrics.h>
38#include <linux/sunrpc/xprtsock.h>
39#include <linux/sunrpc/xprtrdma.h>
40#include <linux/nfs_fs.h>
41#include <linux/nfs_mount.h>
42#include <linux/nfs4_mount.h>
43#include <linux/lockd/bind.h>
44#include <linux/seq_file.h>
45#include <linux/mount.h>
46#include <linux/namei.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
49#include <linux/in6.h>
50#include <linux/slab.h>
51#include <net/ipv6.h>
52#include <linux/netdevice.h>
53#include <linux/nfs_xdr.h>
54#include <linux/magic.h>
55#include <linux/parser.h>
56#include <linux/nsproxy.h>
57#include <linux/rcupdate.h>
58
59#include <linux/uaccess.h>
60#include <linux/nfs_ssc.h>
61
62#include "nfs4_fs.h"
63#include "callback.h"
64#include "delegation.h"
65#include "iostat.h"
66#include "internal.h"
67#include "fscache.h"
68#include "nfs4session.h"
69#include "pnfs.h"
70#include "nfs.h"
71
72#define NFSDBG_FACILITY NFSDBG_VFS
73
74const struct super_operations nfs_sops = {
75 .alloc_inode = nfs_alloc_inode,
76 .free_inode = nfs_free_inode,
77 .write_inode = nfs_write_inode,
78 .drop_inode = nfs_drop_inode,
79 .statfs = nfs_statfs,
80 .evict_inode = nfs_evict_inode,
81 .umount_begin = nfs_umount_begin,
82 .show_options = nfs_show_options,
83 .show_devname = nfs_show_devname,
84 .show_path = nfs_show_path,
85 .show_stats = nfs_show_stats,
86};
87EXPORT_SYMBOL_GPL(nfs_sops);
88
89#ifdef CONFIG_NFS_V4_2
90static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = {
91 .sco_sb_deactive = nfs_sb_deactive,
92};
93#endif
94
95#if IS_ENABLED(CONFIG_NFS_V4)
96static int __init register_nfs4_fs(void)
97{
98 return register_filesystem(&nfs4_fs_type);
99}
100
101static void unregister_nfs4_fs(void)
102{
103 unregister_filesystem(&nfs4_fs_type);
104}
105#else
106static int __init register_nfs4_fs(void)
107{
108 return 0;
109}
110
111static void unregister_nfs4_fs(void)
112{
113}
114#endif
115
116#ifdef CONFIG_NFS_V4_2
117static void nfs_ssc_register_ops(void)
118{
119 nfs_ssc_register(&nfs_ssc_clnt_ops_tbl);
120}
121
122static void nfs_ssc_unregister_ops(void)
123{
124 nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl);
125}
126#endif
127
128static struct shrinker acl_shrinker = {
129 .count_objects = nfs_access_cache_count,
130 .scan_objects = nfs_access_cache_scan,
131 .seeks = DEFAULT_SEEKS,
132};
133
134
135
136
137int __init register_nfs_fs(void)
138{
139 int ret;
140
141 ret = register_filesystem(&nfs_fs_type);
142 if (ret < 0)
143 goto error_0;
144
145 ret = register_nfs4_fs();
146 if (ret < 0)
147 goto error_1;
148
149 ret = nfs_register_sysctl();
150 if (ret < 0)
151 goto error_2;
152 ret = register_shrinker(&acl_shrinker);
153 if (ret < 0)
154 goto error_3;
155#ifdef CONFIG_NFS_V4_2
156 nfs_ssc_register_ops();
157#endif
158 return 0;
159error_3:
160 nfs_unregister_sysctl();
161error_2:
162 unregister_nfs4_fs();
163error_1:
164 unregister_filesystem(&nfs_fs_type);
165error_0:
166 return ret;
167}
168
169
170
171
172void __exit unregister_nfs_fs(void)
173{
174 unregister_shrinker(&acl_shrinker);
175 nfs_unregister_sysctl();
176 unregister_nfs4_fs();
177#ifdef CONFIG_NFS_V4_2
178 nfs_ssc_unregister_ops();
179#endif
180 unregister_filesystem(&nfs_fs_type);
181}
182
183bool nfs_sb_active(struct super_block *sb)
184{
185 struct nfs_server *server = NFS_SB(sb);
186
187 if (!atomic_inc_not_zero(&sb->s_active))
188 return false;
189 if (atomic_inc_return(&server->active) != 1)
190 atomic_dec(&sb->s_active);
191 return true;
192}
193EXPORT_SYMBOL_GPL(nfs_sb_active);
194
195void nfs_sb_deactive(struct super_block *sb)
196{
197 struct nfs_server *server = NFS_SB(sb);
198
199 if (atomic_dec_and_test(&server->active))
200 deactivate_super(sb);
201}
202EXPORT_SYMBOL_GPL(nfs_sb_deactive);
203
204static int __nfs_list_for_each_server(struct list_head *head,
205 int (*fn)(struct nfs_server *, void *),
206 void *data)
207{
208 struct nfs_server *server, *last = NULL;
209 int ret = 0;
210
211 rcu_read_lock();
212 list_for_each_entry_rcu(server, head, client_link) {
213 if (!(server->super && nfs_sb_active(server->super)))
214 continue;
215 rcu_read_unlock();
216 if (last)
217 nfs_sb_deactive(last->super);
218 last = server;
219 ret = fn(server, data);
220 if (ret)
221 goto out;
222 rcu_read_lock();
223 }
224 rcu_read_unlock();
225out:
226 if (last)
227 nfs_sb_deactive(last->super);
228 return ret;
229}
230
231int nfs_client_for_each_server(struct nfs_client *clp,
232 int (*fn)(struct nfs_server *, void *),
233 void *data)
234{
235 return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data);
236}
237EXPORT_SYMBOL_GPL(nfs_client_for_each_server);
238
239
240
241
242int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
243{
244 struct nfs_server *server = NFS_SB(dentry->d_sb);
245 unsigned char blockbits;
246 unsigned long blockres;
247 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
248 struct nfs_fsstat res;
249 int error = -ENOMEM;
250
251 res.fattr = nfs_alloc_fattr();
252 if (res.fattr == NULL)
253 goto out_err;
254
255 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
256 if (unlikely(error == -ESTALE)) {
257 struct dentry *pd_dentry;
258
259 pd_dentry = dget_parent(dentry);
260 nfs_zap_caches(d_inode(pd_dentry));
261 dput(pd_dentry);
262 }
263 nfs_free_fattr(res.fattr);
264 if (error < 0)
265 goto out_err;
266
267 buf->f_type = NFS_SUPER_MAGIC;
268
269
270
271
272
273
274 buf->f_frsize = dentry->d_sb->s_blocksize;
275
276
277
278
279
280
281
282
283 buf->f_bsize = dentry->d_sb->s_blocksize;
284 blockbits = dentry->d_sb->s_blocksize_bits;
285 blockres = (1 << blockbits) - 1;
286 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
287 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
288 buf->f_bavail = (res.abytes + blockres) >> blockbits;
289
290 buf->f_files = res.tfiles;
291 buf->f_ffree = res.afiles;
292
293 buf->f_namelen = server->namelen;
294
295 return 0;
296
297 out_err:
298 dprintk("%s: statfs error = %d\n", __func__, -error);
299 return error;
300}
301EXPORT_SYMBOL_GPL(nfs_statfs);
302
303
304
305
306static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
307{
308 static const struct {
309 rpc_authflavor_t flavour;
310 const char *str;
311 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
312
313 { RPC_AUTH_NULL, "null" },
314 { RPC_AUTH_UNIX, "sys" },
315 { RPC_AUTH_GSS_KRB5, "krb5" },
316 { RPC_AUTH_GSS_KRB5I, "krb5i" },
317 { RPC_AUTH_GSS_KRB5P, "krb5p" },
318 { RPC_AUTH_GSS_LKEY, "lkey" },
319 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
320 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
321 { RPC_AUTH_GSS_SPKM, "spkm" },
322 { RPC_AUTH_GSS_SPKMI, "spkmi" },
323 { RPC_AUTH_GSS_SPKMP, "spkmp" },
324 { UINT_MAX, "unknown" }
325 };
326 int i;
327
328 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
329 if (sec_flavours[i].flavour == flavour)
330 break;
331 }
332 return sec_flavours[i].str;
333}
334
335static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
336 int showdefaults)
337{
338 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
339 char *proto = NULL;
340
341 switch (sap->sa_family) {
342 case AF_INET:
343 switch (nfss->mountd_protocol) {
344 case IPPROTO_UDP:
345 proto = RPCBIND_NETID_UDP;
346 break;
347 case IPPROTO_TCP:
348 proto = RPCBIND_NETID_TCP;
349 break;
350 }
351 break;
352 case AF_INET6:
353 switch (nfss->mountd_protocol) {
354 case IPPROTO_UDP:
355 proto = RPCBIND_NETID_UDP6;
356 break;
357 case IPPROTO_TCP:
358 proto = RPCBIND_NETID_TCP6;
359 break;
360 }
361 break;
362 }
363 if (proto || showdefaults)
364 seq_printf(m, ",mountproto=%s", proto ?: "auto");
365}
366
367static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
368 int showdefaults)
369{
370 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
371
372 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
373 return;
374
375 switch (sap->sa_family) {
376 case AF_INET: {
377 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
378 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
379 break;
380 }
381 case AF_INET6: {
382 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
383 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
384 break;
385 }
386 default:
387 if (showdefaults)
388 seq_puts(m, ",mountaddr=unspecified");
389 }
390
391 if (nfss->mountd_version || showdefaults)
392 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
393 if ((nfss->mountd_port &&
394 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
395 showdefaults)
396 seq_printf(m, ",mountport=%u", nfss->mountd_port);
397
398 nfs_show_mountd_netid(m, nfss, showdefaults);
399}
400
401#if IS_ENABLED(CONFIG_NFS_V4)
402static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
403 int showdefaults)
404{
405 struct nfs_client *clp = nfss->nfs_client;
406
407 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
408}
409#else
410static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
411 int showdefaults)
412{
413}
414#endif
415
416static void nfs_show_nfs_version(struct seq_file *m,
417 unsigned int version,
418 unsigned int minorversion)
419{
420 seq_printf(m, ",vers=%u", version);
421 if (version == 4)
422 seq_printf(m, ".%u", minorversion);
423}
424
425
426
427
428static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
429 int showdefaults)
430{
431 static const struct proc_nfs_info {
432 int flag;
433 const char *str;
434 const char *nostr;
435 } nfs_info[] = {
436 { NFS_MOUNT_SOFT, ",soft", "" },
437 { NFS_MOUNT_SOFTERR, ",softerr", "" },
438 { NFS_MOUNT_SOFTREVAL, ",softreval", "" },
439 { NFS_MOUNT_POSIX, ",posix", "" },
440 { NFS_MOUNT_NOCTO, ",nocto", "" },
441 { NFS_MOUNT_NOAC, ",noac", "" },
442 { NFS_MOUNT_NONLM, ",nolock", "" },
443 { NFS_MOUNT_NOACL, ",noacl", "" },
444 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
445 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
446 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
447 { 0, NULL, NULL }
448 };
449 const struct proc_nfs_info *nfs_infop;
450 struct nfs_client *clp = nfss->nfs_client;
451 u32 version = clp->rpc_ops->version;
452 int local_flock, local_fcntl;
453
454 nfs_show_nfs_version(m, version, clp->cl_minorversion);
455 seq_printf(m, ",rsize=%u", nfss->rsize);
456 seq_printf(m, ",wsize=%u", nfss->wsize);
457 if (nfss->bsize != 0)
458 seq_printf(m, ",bsize=%u", nfss->bsize);
459 seq_printf(m, ",namlen=%u", nfss->namelen);
460 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
461 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
462 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
463 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
464 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
465 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
466 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
467 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
468 if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)))
469 seq_puts(m, ",hard");
470 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
471 if (nfss->flags & nfs_infop->flag)
472 seq_puts(m, nfs_infop->str);
473 else
474 seq_puts(m, nfs_infop->nostr);
475 }
476 rcu_read_lock();
477 seq_printf(m, ",proto=%s",
478 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
479 rcu_read_unlock();
480 if (clp->cl_nconnect > 0)
481 seq_printf(m, ",nconnect=%u", clp->cl_nconnect);
482 if (version == 4) {
483 if (clp->cl_max_connect > 1)
484 seq_printf(m, ",max_connect=%u", clp->cl_max_connect);
485 if (nfss->port != NFS_PORT)
486 seq_printf(m, ",port=%u", nfss->port);
487 } else
488 if (nfss->port)
489 seq_printf(m, ",port=%u", nfss->port);
490
491 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
492 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
493 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
494
495 if (version != 4)
496 nfs_show_mountd_options(m, nfss, showdefaults);
497 else
498 nfs_show_nfsv4_options(m, nfss, showdefaults);
499
500 if (nfss->options & NFS_OPTION_FSCACHE)
501 seq_puts(m, ",fsc");
502
503 if (nfss->options & NFS_OPTION_MIGRATION)
504 seq_puts(m, ",migration");
505
506 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
507 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
508 seq_puts(m, ",lookupcache=none");
509 else
510 seq_puts(m, ",lookupcache=pos");
511 }
512
513 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
514 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
515
516 if (!local_flock && !local_fcntl)
517 seq_puts(m, ",local_lock=none");
518 else if (local_flock && local_fcntl)
519 seq_puts(m, ",local_lock=all");
520 else if (local_flock)
521 seq_puts(m, ",local_lock=flock");
522 else
523 seq_puts(m, ",local_lock=posix");
524
525 if (nfss->flags & NFS_MOUNT_WRITE_EAGER) {
526 if (nfss->flags & NFS_MOUNT_WRITE_WAIT)
527 seq_puts(m, ",write=wait");
528 else
529 seq_puts(m, ",write=eager");
530 }
531}
532
533
534
535
536int nfs_show_options(struct seq_file *m, struct dentry *root)
537{
538 struct nfs_server *nfss = NFS_SB(root->d_sb);
539
540 nfs_show_mount_options(m, nfss, 0);
541
542 rcu_read_lock();
543 seq_printf(m, ",addr=%s",
544 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
545 RPC_DISPLAY_ADDR));
546 rcu_read_unlock();
547
548 return 0;
549}
550EXPORT_SYMBOL_GPL(nfs_show_options);
551
552#if IS_ENABLED(CONFIG_NFS_V4)
553static void show_lease(struct seq_file *m, struct nfs_server *server)
554{
555 struct nfs_client *clp = server->nfs_client;
556 unsigned long expire;
557
558 seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ);
559 expire = clp->cl_last_renewal + clp->cl_lease_time;
560 seq_printf(m, ",lease_expired=%ld",
561 time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ);
562}
563#ifdef CONFIG_NFS_V4_1
564static void show_sessions(struct seq_file *m, struct nfs_server *server)
565{
566 if (nfs4_has_session(server->nfs_client))
567 seq_puts(m, ",sessions");
568}
569#else
570static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
571#endif
572#endif
573
574#ifdef CONFIG_NFS_V4_1
575static void show_pnfs(struct seq_file *m, struct nfs_server *server)
576{
577 seq_printf(m, ",pnfs=");
578 if (server->pnfs_curr_ld)
579 seq_printf(m, "%s", server->pnfs_curr_ld->name);
580 else
581 seq_printf(m, "not configured");
582}
583
584static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
585{
586 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
587 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
588 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
589 "date='%llu,%u'",
590 impl_id->name, impl_id->domain,
591 impl_id->date.seconds, impl_id->date.nseconds);
592 }
593}
594#else
595#if IS_ENABLED(CONFIG_NFS_V4)
596static void show_pnfs(struct seq_file *m, struct nfs_server *server)
597{
598}
599#endif
600static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
601{
602}
603#endif
604
605int nfs_show_devname(struct seq_file *m, struct dentry *root)
606{
607 char *page = (char *) __get_free_page(GFP_KERNEL);
608 char *devname, *dummy;
609 int err = 0;
610 if (!page)
611 return -ENOMEM;
612 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
613 if (IS_ERR(devname))
614 err = PTR_ERR(devname);
615 else
616 seq_escape(m, devname, " \t\n\\");
617 free_page((unsigned long)page);
618 return err;
619}
620EXPORT_SYMBOL_GPL(nfs_show_devname);
621
622int nfs_show_path(struct seq_file *m, struct dentry *dentry)
623{
624 seq_puts(m, "/");
625 return 0;
626}
627EXPORT_SYMBOL_GPL(nfs_show_path);
628
629
630
631
632int nfs_show_stats(struct seq_file *m, struct dentry *root)
633{
634 int i, cpu;
635 struct nfs_server *nfss = NFS_SB(root->d_sb);
636 struct rpc_auth *auth = nfss->client->cl_auth;
637 struct nfs_iostats totals = { };
638
639 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
640
641
642
643
644 seq_puts(m, "\n\topts:\t");
645 seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
646 seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
647 seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
648 seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
649 nfs_show_mount_options(m, nfss, 1);
650
651 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
652
653 show_implementation_id(m, nfss);
654
655 seq_puts(m, "\n\tcaps:\t");
656 seq_printf(m, "caps=0x%x", nfss->caps);
657 seq_printf(m, ",wtmult=%u", nfss->wtmult);
658 seq_printf(m, ",dtsize=%u", nfss->dtsize);
659 seq_printf(m, ",bsize=%u", nfss->bsize);
660 seq_printf(m, ",namlen=%u", nfss->namelen);
661
662#if IS_ENABLED(CONFIG_NFS_V4)
663 if (nfss->nfs_client->rpc_ops->version == 4) {
664 seq_puts(m, "\n\tnfsv4:\t");
665 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
666 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
667 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
668 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
669 show_sessions(m, nfss);
670 show_pnfs(m, nfss);
671 show_lease(m, nfss);
672 }
673#endif
674
675
676
677
678 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
679 if (auth->au_flavor)
680 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
681
682
683
684
685 for_each_possible_cpu(cpu) {
686 struct nfs_iostats *stats;
687
688 preempt_disable();
689 stats = per_cpu_ptr(nfss->io_stats, cpu);
690
691 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
692 totals.events[i] += stats->events[i];
693 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
694 totals.bytes[i] += stats->bytes[i];
695#ifdef CONFIG_NFS_FSCACHE
696 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
697 totals.fscache[i] += stats->fscache[i];
698#endif
699
700 preempt_enable();
701 }
702
703 seq_puts(m, "\n\tevents:\t");
704 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
705 seq_printf(m, "%lu ", totals.events[i]);
706 seq_puts(m, "\n\tbytes:\t");
707 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
708 seq_printf(m, "%Lu ", totals.bytes[i]);
709#ifdef CONFIG_NFS_FSCACHE
710 if (nfss->options & NFS_OPTION_FSCACHE) {
711 seq_puts(m, "\n\tfsc:\t");
712 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
713 seq_printf(m, "%Lu ", totals.fscache[i]);
714 }
715#endif
716 seq_putc(m, '\n');
717
718 rpc_clnt_show_stats(m, nfss->client);
719
720 return 0;
721}
722EXPORT_SYMBOL_GPL(nfs_show_stats);
723
724
725
726
727
728void nfs_umount_begin(struct super_block *sb)
729{
730 struct nfs_server *server;
731 struct rpc_clnt *rpc;
732
733 server = NFS_SB(sb);
734
735 rpc = server->client_acl;
736 if (!IS_ERR(rpc))
737 rpc_killall_tasks(rpc);
738 rpc = server->client;
739 if (!IS_ERR(rpc))
740 rpc_killall_tasks(rpc);
741}
742EXPORT_SYMBOL_GPL(nfs_umount_begin);
743
744
745
746
747
748bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
749 rpc_authflavor_t match)
750{
751 int i;
752
753 if (!auth_info->flavor_len)
754 return true;
755
756 for (i = 0; i < auth_info->flavor_len; i++) {
757 if (auth_info->flavors[i] == match)
758 return true;
759 }
760 return false;
761}
762EXPORT_SYMBOL_GPL(nfs_auth_info_match);
763
764
765
766
767
768
769static int nfs_verify_authflavors(struct nfs_fs_context *ctx,
770 rpc_authflavor_t *server_authlist,
771 unsigned int count)
772{
773 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
774 bool found_auth_null = false;
775 unsigned int i;
776
777
778
779
780
781
782
783
784
785
786
787
788
789 for (i = 0; i < count; i++) {
790 flavor = server_authlist[i];
791
792 if (nfs_auth_info_match(&ctx->auth_info, flavor))
793 goto out;
794
795 if (flavor == RPC_AUTH_NULL)
796 found_auth_null = true;
797 }
798
799 if (found_auth_null) {
800 flavor = ctx->auth_info.flavors[0];
801 goto out;
802 }
803
804 dfprintk(MOUNT,
805 "NFS: specified auth flavors not supported by server\n");
806 return -EACCES;
807
808out:
809 ctx->selected_flavor = flavor;
810 dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor);
811 return 0;
812}
813
814
815
816
817
818static int nfs_request_mount(struct fs_context *fc,
819 struct nfs_fh *root_fh,
820 rpc_authflavor_t *server_authlist,
821 unsigned int *server_authlist_len)
822{
823 struct nfs_fs_context *ctx = nfs_fc2context(fc);
824 struct nfs_mount_request request = {
825 .sap = (struct sockaddr *)
826 &ctx->mount_server.address,
827 .dirpath = ctx->nfs_server.export_path,
828 .protocol = ctx->mount_server.protocol,
829 .fh = root_fh,
830 .noresvport = ctx->flags & NFS_MOUNT_NORESVPORT,
831 .auth_flav_len = server_authlist_len,
832 .auth_flavs = server_authlist,
833 .net = fc->net_ns,
834 };
835 int status;
836
837 if (ctx->mount_server.version == 0) {
838 switch (ctx->version) {
839 default:
840 ctx->mount_server.version = NFS_MNT3_VERSION;
841 break;
842 case 2:
843 ctx->mount_server.version = NFS_MNT_VERSION;
844 }
845 }
846 request.version = ctx->mount_server.version;
847
848 if (ctx->mount_server.hostname)
849 request.hostname = ctx->mount_server.hostname;
850 else
851 request.hostname = ctx->nfs_server.hostname;
852
853
854
855
856 if (ctx->mount_server.address.sa_family == AF_UNSPEC) {
857 memcpy(request.sap, &ctx->nfs_server.address,
858 ctx->nfs_server.addrlen);
859 ctx->mount_server.addrlen = ctx->nfs_server.addrlen;
860 }
861 request.salen = ctx->mount_server.addrlen;
862 nfs_set_port(request.sap, &ctx->mount_server.port, 0);
863
864
865
866
867
868 status = nfs_mount(&request, ctx->timeo, ctx->retrans);
869 if (status != 0) {
870 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
871 request.hostname, status);
872 return status;
873 }
874
875 return 0;
876}
877
878static struct nfs_server *nfs_try_mount_request(struct fs_context *fc)
879{
880 struct nfs_fs_context *ctx = nfs_fc2context(fc);
881 int status;
882 unsigned int i;
883 bool tried_auth_unix = false;
884 bool auth_null_in_list = false;
885 struct nfs_server *server = ERR_PTR(-EACCES);
886 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
887 unsigned int authlist_len = ARRAY_SIZE(authlist);
888
889 status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len);
890 if (status)
891 return ERR_PTR(status);
892
893
894
895
896
897 if (ctx->auth_info.flavor_len > 0) {
898 status = nfs_verify_authflavors(ctx, authlist, authlist_len);
899 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
900 ctx->selected_flavor);
901 if (status)
902 return ERR_PTR(status);
903 return ctx->nfs_mod->rpc_ops->create_server(fc);
904 }
905
906
907
908
909
910
911 for (i = 0; i < authlist_len; ++i) {
912 rpc_authflavor_t flavor;
913 struct rpcsec_gss_info info;
914
915 flavor = authlist[i];
916 switch (flavor) {
917 case RPC_AUTH_UNIX:
918 tried_auth_unix = true;
919 break;
920 case RPC_AUTH_NULL:
921 auth_null_in_list = true;
922 continue;
923 default:
924 if (rpcauth_get_gssinfo(flavor, &info) != 0)
925 continue;
926 break;
927 }
928 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
929 ctx->selected_flavor = flavor;
930 server = ctx->nfs_mod->rpc_ops->create_server(fc);
931 if (!IS_ERR(server))
932 return server;
933 }
934
935
936
937
938
939
940 if (tried_auth_unix || !auth_null_in_list)
941 return server;
942
943
944 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
945 ctx->selected_flavor = RPC_AUTH_UNIX;
946 return ctx->nfs_mod->rpc_ops->create_server(fc);
947}
948
949int nfs_try_get_tree(struct fs_context *fc)
950{
951 struct nfs_fs_context *ctx = nfs_fc2context(fc);
952
953 if (ctx->need_mount)
954 ctx->server = nfs_try_mount_request(fc);
955 else
956 ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc);
957
958 return nfs_get_tree_common(fc);
959}
960EXPORT_SYMBOL_GPL(nfs_try_get_tree);
961
962
963#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
964 | NFS_MOUNT_SECURE \
965 | NFS_MOUNT_TCP \
966 | NFS_MOUNT_VER3 \
967 | NFS_MOUNT_KERBEROS \
968 | NFS_MOUNT_NONLM \
969 | NFS_MOUNT_BROKEN_SUID \
970 | NFS_MOUNT_STRICTLOCK \
971 | NFS_MOUNT_LEGACY_INTERFACE)
972
973#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
974 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
975
976static int
977nfs_compare_remount_data(struct nfs_server *nfss,
978 struct nfs_fs_context *ctx)
979{
980 if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
981 ctx->rsize != nfss->rsize ||
982 ctx->wsize != nfss->wsize ||
983 ctx->version != nfss->nfs_client->rpc_ops->version ||
984 ctx->minorversion != nfss->nfs_client->cl_minorversion ||
985 ctx->retrans != nfss->client->cl_timeout->to_retries ||
986 !nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) ||
987 ctx->acregmin != nfss->acregmin / HZ ||
988 ctx->acregmax != nfss->acregmax / HZ ||
989 ctx->acdirmin != nfss->acdirmin / HZ ||
990 ctx->acdirmax != nfss->acdirmax / HZ ||
991 ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
992 (ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) ||
993 ctx->nfs_server.port != nfss->port ||
994 ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
995 !rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address,
996 (struct sockaddr *)&nfss->nfs_client->cl_addr))
997 return -EINVAL;
998
999 return 0;
1000}
1001
1002int nfs_reconfigure(struct fs_context *fc)
1003{
1004 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1005 struct super_block *sb = fc->root->d_sb;
1006 struct nfs_server *nfss = sb->s_fs_info;
1007 int ret;
1008
1009 sync_filesystem(sb);
1010
1011
1012
1013
1014
1015
1016
1017 if (ctx->skip_reconfig_option_check)
1018 return 0;
1019
1020
1021
1022
1023
1024
1025
1026 if (ctx->flags & NFS_MOUNT_NOAC) {
1027 fc->sb_flags |= SB_SYNCHRONOUS;
1028 fc->sb_flags_mask |= SB_SYNCHRONOUS;
1029 }
1030
1031
1032 ret = nfs_compare_remount_data(nfss, ctx);
1033 if (ret)
1034 return ret;
1035
1036 return nfs_probe_server(nfss, NFS_FH(d_inode(fc->root)));
1037}
1038EXPORT_SYMBOL_GPL(nfs_reconfigure);
1039
1040
1041
1042
1043static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
1044{
1045 struct nfs_server *server = NFS_SB(sb);
1046
1047 sb->s_blocksize_bits = 0;
1048 sb->s_blocksize = 0;
1049 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
1050 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
1051 if (ctx->bsize)
1052 sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits);
1053
1054 if (server->nfs_client->rpc_ops->version != 2) {
1055
1056
1057
1058 sb->s_flags |= SB_POSIXACL;
1059 sb->s_time_gran = 1;
1060 sb->s_export_op = &nfs_export_ops;
1061 } else
1062 sb->s_time_gran = 1000;
1063
1064 if (server->nfs_client->rpc_ops->version != 4) {
1065 sb->s_time_min = 0;
1066 sb->s_time_max = U32_MAX;
1067 } else {
1068 sb->s_time_min = S64_MIN;
1069 sb->s_time_max = S64_MAX;
1070 }
1071
1072 sb->s_magic = NFS_SUPER_MAGIC;
1073
1074
1075 snprintf(sb->s_id, sizeof(sb->s_id),
1076 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1077
1078 if (sb->s_blocksize == 0)
1079 sb->s_blocksize = nfs_block_bits(server->wsize,
1080 &sb->s_blocksize_bits);
1081
1082 nfs_super_set_maxbytes(sb, server->maxfilesize);
1083 server->has_sec_mnt_opts = ctx->has_sec_mnt_opts;
1084}
1085
1086static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b,
1087 const struct fs_context *fc)
1088{
1089 const struct nfs_server *a = s->s_fs_info;
1090 const struct rpc_clnt *clnt_a = a->client;
1091 const struct rpc_clnt *clnt_b = b->client;
1092
1093 if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK))
1094 goto Ebusy;
1095 if (a->nfs_client != b->nfs_client)
1096 goto Ebusy;
1097 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
1098 goto Ebusy;
1099 if (a->wsize != b->wsize)
1100 goto Ebusy;
1101 if (a->rsize != b->rsize)
1102 goto Ebusy;
1103 if (a->acregmin != b->acregmin)
1104 goto Ebusy;
1105 if (a->acregmax != b->acregmax)
1106 goto Ebusy;
1107 if (a->acdirmin != b->acdirmin)
1108 goto Ebusy;
1109 if (a->acdirmax != b->acdirmax)
1110 goto Ebusy;
1111 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1112 goto Ebusy;
1113 return 1;
1114Ebusy:
1115 return 0;
1116}
1117
1118static int nfs_set_super(struct super_block *s, struct fs_context *fc)
1119{
1120 struct nfs_server *server = fc->s_fs_info;
1121 int ret;
1122
1123 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
1124 ret = set_anon_super(s, server);
1125 if (ret == 0)
1126 server->s_dev = s->s_dev;
1127 return ret;
1128}
1129
1130static int nfs_compare_super_address(struct nfs_server *server1,
1131 struct nfs_server *server2)
1132{
1133 struct sockaddr *sap1, *sap2;
1134 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
1135 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
1136
1137 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
1138 return 0;
1139
1140 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1141 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1142
1143 if (sap1->sa_family != sap2->sa_family)
1144 return 0;
1145
1146 switch (sap1->sa_family) {
1147 case AF_INET: {
1148 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1149 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1150 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1151 return 0;
1152 if (sin1->sin_port != sin2->sin_port)
1153 return 0;
1154 break;
1155 }
1156 case AF_INET6: {
1157 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1158 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1159 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1160 return 0;
1161 if (sin1->sin6_port != sin2->sin6_port)
1162 return 0;
1163 break;
1164 }
1165 default:
1166 return 0;
1167 }
1168
1169 return 1;
1170}
1171
1172static int nfs_compare_userns(const struct nfs_server *old,
1173 const struct nfs_server *new)
1174{
1175 const struct user_namespace *oldns = &init_user_ns;
1176 const struct user_namespace *newns = &init_user_ns;
1177
1178 if (old->client && old->client->cl_cred)
1179 oldns = old->client->cl_cred->user_ns;
1180 if (new->client && new->client->cl_cred)
1181 newns = new->client->cl_cred->user_ns;
1182 if (oldns != newns)
1183 return 0;
1184 return 1;
1185}
1186
1187static int nfs_compare_super(struct super_block *sb, struct fs_context *fc)
1188{
1189 struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb);
1190
1191 if (!nfs_compare_super_address(old, server))
1192 return 0;
1193
1194 if (old->flags & NFS_MOUNT_UNSHARED)
1195 return 0;
1196 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1197 return 0;
1198 if (!nfs_compare_userns(old, server))
1199 return 0;
1200 if ((old->has_sec_mnt_opts || fc->security) &&
1201 security_sb_mnt_opts_compat(sb, fc->security))
1202 return 0;
1203 return nfs_compare_mount_options(sb, server, fc);
1204}
1205
1206#ifdef CONFIG_NFS_FSCACHE
1207static int nfs_get_cache_cookie(struct super_block *sb,
1208 struct nfs_fs_context *ctx)
1209{
1210 struct nfs_server *nfss = NFS_SB(sb);
1211 char *uniq = NULL;
1212 int ulen = 0;
1213
1214 nfss->fscache = NULL;
1215
1216 if (!ctx)
1217 return 0;
1218
1219 if (ctx->clone_data.sb) {
1220 struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb);
1221 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
1222 return 0;
1223 if (mnt_s->fscache_uniq) {
1224 uniq = mnt_s->fscache_uniq;
1225 ulen = strlen(uniq);
1226 }
1227 } else {
1228 if (!(ctx->options & NFS_OPTION_FSCACHE))
1229 return 0;
1230 if (ctx->fscache_uniq) {
1231 uniq = ctx->fscache_uniq;
1232 ulen = strlen(ctx->fscache_uniq);
1233 }
1234 }
1235
1236 return nfs_fscache_get_super_cookie(sb, uniq, ulen);
1237}
1238#else
1239static int nfs_get_cache_cookie(struct super_block *sb,
1240 struct nfs_fs_context *ctx)
1241{
1242 return 0;
1243}
1244#endif
1245
1246int nfs_get_tree_common(struct fs_context *fc)
1247{
1248 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1249 struct super_block *s;
1250 int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super;
1251 struct nfs_server *server = ctx->server;
1252 int error;
1253
1254 ctx->server = NULL;
1255 if (IS_ERR(server))
1256 return PTR_ERR(server);
1257
1258 if (server->flags & NFS_MOUNT_UNSHARED)
1259 compare_super = NULL;
1260
1261
1262 if (server->flags & NFS_MOUNT_NOAC)
1263 fc->sb_flags |= SB_SYNCHRONOUS;
1264
1265 if (ctx->clone_data.sb)
1266 if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS)
1267 fc->sb_flags |= SB_SYNCHRONOUS;
1268
1269 if (server->caps & NFS_CAP_SECURITY_LABEL)
1270 fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS;
1271
1272
1273 fc->s_fs_info = server;
1274 s = sget_fc(fc, compare_super, nfs_set_super);
1275 fc->s_fs_info = NULL;
1276 if (IS_ERR(s)) {
1277 error = PTR_ERR(s);
1278 nfs_errorf(fc, "NFS: Couldn't get superblock");
1279 goto out_err_nosb;
1280 }
1281
1282 if (s->s_fs_info != server) {
1283 nfs_free_server(server);
1284 server = NULL;
1285 } else {
1286 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
1287 MINOR(server->s_dev));
1288 if (error)
1289 goto error_splat_super;
1290 s->s_bdi->io_pages = server->rpages;
1291 server->super = s;
1292 }
1293
1294 if (!s->s_root) {
1295 unsigned bsize = ctx->clone_data.inherited_bsize;
1296
1297 nfs_fill_super(s, ctx);
1298 if (bsize) {
1299 s->s_blocksize_bits = bsize;
1300 s->s_blocksize = 1U << bsize;
1301 }
1302 error = nfs_get_cache_cookie(s, ctx);
1303 if (error < 0)
1304 goto error_splat_super;
1305 }
1306
1307 error = nfs_get_root(s, fc);
1308 if (error < 0) {
1309 nfs_errorf(fc, "NFS: Couldn't get root dentry");
1310 goto error_splat_super;
1311 }
1312
1313 s->s_flags |= SB_ACTIVE;
1314 error = 0;
1315
1316out:
1317 return error;
1318
1319out_err_nosb:
1320 nfs_free_server(server);
1321 goto out;
1322error_splat_super:
1323 deactivate_locked_super(s);
1324 goto out;
1325}
1326
1327
1328
1329
1330void nfs_kill_super(struct super_block *s)
1331{
1332 struct nfs_server *server = NFS_SB(s);
1333 dev_t dev = s->s_dev;
1334
1335 generic_shutdown_super(s);
1336
1337 nfs_fscache_release_super_cookie(s);
1338
1339 nfs_free_server(server);
1340 free_anon_bdev(dev);
1341}
1342EXPORT_SYMBOL_GPL(nfs_kill_super);
1343
1344#if IS_ENABLED(CONFIG_NFS_V4)
1345
1346
1347
1348
1349
1350unsigned int nfs_callback_set_tcpport;
1351unsigned short nfs_callback_nr_threads;
1352
1353unsigned int nfs_idmap_cache_timeout = 600;
1354
1355bool nfs4_disable_idmapping = true;
1356unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
1357unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
1358unsigned short send_implementation_id = 1;
1359char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
1360bool recover_lost_locks = false;
1361
1362EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
1363EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
1364EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
1365EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
1366EXPORT_SYMBOL_GPL(max_session_slots);
1367EXPORT_SYMBOL_GPL(max_session_cb_slots);
1368EXPORT_SYMBOL_GPL(send_implementation_id);
1369EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
1370EXPORT_SYMBOL_GPL(recover_lost_locks);
1371
1372#define NFS_CALLBACK_MAXPORTNR (65535U)
1373
1374static int param_set_portnr(const char *val, const struct kernel_param *kp)
1375{
1376 unsigned long num;
1377 int ret;
1378
1379 if (!val)
1380 return -EINVAL;
1381 ret = kstrtoul(val, 0, &num);
1382 if (ret || num > NFS_CALLBACK_MAXPORTNR)
1383 return -EINVAL;
1384 *((unsigned int *)kp->arg) = num;
1385 return 0;
1386}
1387static const struct kernel_param_ops param_ops_portnr = {
1388 .set = param_set_portnr,
1389 .get = param_get_uint,
1390};
1391#define param_check_portnr(name, p) __param_check(name, p, unsigned int)
1392
1393module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
1394module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
1395MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
1396 "assigned to the NFSv4 callback channels.");
1397module_param(nfs_idmap_cache_timeout, int, 0644);
1398module_param(nfs4_disable_idmapping, bool, 0644);
1399module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
1400 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
1401MODULE_PARM_DESC(nfs4_disable_idmapping,
1402 "Turn off NFSv4 idmapping when using 'sec=sys'");
1403module_param(max_session_slots, ushort, 0644);
1404MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
1405 "requests the client will negotiate");
1406module_param(max_session_cb_slots, ushort, 0644);
1407MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
1408 "callbacks the client will process for a given server");
1409module_param(send_implementation_id, ushort, 0644);
1410MODULE_PARM_DESC(send_implementation_id,
1411 "Send implementation ID with NFSv4.1 exchange_id");
1412MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
1413
1414module_param(recover_lost_locks, bool, 0644);
1415MODULE_PARM_DESC(recover_lost_locks,
1416 "If the server reports that a lock might be lost, "
1417 "try to recover it risking data corruption.");
1418
1419
1420#endif
1421
