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NFS: Convert v2 into a module
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67 #include "nfs.h"
68
69 #define NFSDBG_FACILITY NFSDBG_VFS
70 #define NFS_TEXT_DATA 1
71
72 #ifdef CONFIG_NFS_V3
73 #define NFS_DEFAULT_VERSION 3
74 #else
75 #define NFS_DEFAULT_VERSION 2
76 #endif
77
78 enum {
79 /* Mount options that take no arguments */
80 Opt_soft, Opt_hard,
81 Opt_posix, Opt_noposix,
82 Opt_cto, Opt_nocto,
83 Opt_ac, Opt_noac,
84 Opt_lock, Opt_nolock,
85 Opt_udp, Opt_tcp, Opt_rdma,
86 Opt_acl, Opt_noacl,
87 Opt_rdirplus, Opt_nordirplus,
88 Opt_sharecache, Opt_nosharecache,
89 Opt_resvport, Opt_noresvport,
90 Opt_fscache, Opt_nofscache,
91
92 /* Mount options that take integer arguments */
93 Opt_port,
94 Opt_rsize, Opt_wsize, Opt_bsize,
95 Opt_timeo, Opt_retrans,
96 Opt_acregmin, Opt_acregmax,
97 Opt_acdirmin, Opt_acdirmax,
98 Opt_actimeo,
99 Opt_namelen,
100 Opt_mountport,
101 Opt_mountvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
105 Opt_nfsvers,
106 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
107 Opt_addr, Opt_mountaddr, Opt_clientaddr,
108 Opt_lookupcache,
109 Opt_fscache_uniq,
110 Opt_local_lock,
111
112 /* Special mount options */
113 Opt_userspace, Opt_deprecated, Opt_sloppy,
114
115 Opt_err
116 };
117
118 static const match_table_t nfs_mount_option_tokens = {
119 { Opt_userspace, "bg" },
120 { Opt_userspace, "fg" },
121 { Opt_userspace, "retry=%s" },
122
123 { Opt_sloppy, "sloppy" },
124
125 { Opt_soft, "soft" },
126 { Opt_hard, "hard" },
127 { Opt_deprecated, "intr" },
128 { Opt_deprecated, "nointr" },
129 { Opt_posix, "posix" },
130 { Opt_noposix, "noposix" },
131 { Opt_cto, "cto" },
132 { Opt_nocto, "nocto" },
133 { Opt_ac, "ac" },
134 { Opt_noac, "noac" },
135 { Opt_lock, "lock" },
136 { Opt_nolock, "nolock" },
137 { Opt_udp, "udp" },
138 { Opt_tcp, "tcp" },
139 { Opt_rdma, "rdma" },
140 { Opt_acl, "acl" },
141 { Opt_noacl, "noacl" },
142 { Opt_rdirplus, "rdirplus" },
143 { Opt_nordirplus, "nordirplus" },
144 { Opt_sharecache, "sharecache" },
145 { Opt_nosharecache, "nosharecache" },
146 { Opt_resvport, "resvport" },
147 { Opt_noresvport, "noresvport" },
148 { Opt_fscache, "fsc" },
149 { Opt_nofscache, "nofsc" },
150
151 { Opt_port, "port=%s" },
152 { Opt_rsize, "rsize=%s" },
153 { Opt_wsize, "wsize=%s" },
154 { Opt_bsize, "bsize=%s" },
155 { Opt_timeo, "timeo=%s" },
156 { Opt_retrans, "retrans=%s" },
157 { Opt_acregmin, "acregmin=%s" },
158 { Opt_acregmax, "acregmax=%s" },
159 { Opt_acdirmin, "acdirmin=%s" },
160 { Opt_acdirmax, "acdirmax=%s" },
161 { Opt_actimeo, "actimeo=%s" },
162 { Opt_namelen, "namlen=%s" },
163 { Opt_mountport, "mountport=%s" },
164 { Opt_mountvers, "mountvers=%s" },
165 { Opt_minorversion, "minorversion=%s" },
166
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
175 { Opt_mounthost, "mounthost=%s" },
176 { Opt_mountaddr, "mountaddr=%s" },
177
178 { Opt_lookupcache, "lookupcache=%s" },
179 { Opt_fscache_uniq, "fsc=%s" },
180 { Opt_local_lock, "local_lock=%s" },
181
182 /* The following needs to be listed after all other options */
183 { Opt_nfsvers, "v%s" },
184
185 { Opt_err, NULL }
186 };
187
188 enum {
189 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
190
191 Opt_xprt_err
192 };
193
194 static const match_table_t nfs_xprt_protocol_tokens = {
195 { Opt_xprt_udp, "udp" },
196 { Opt_xprt_udp6, "udp6" },
197 { Opt_xprt_tcp, "tcp" },
198 { Opt_xprt_tcp6, "tcp6" },
199 { Opt_xprt_rdma, "rdma" },
200
201 { Opt_xprt_err, NULL }
202 };
203
204 enum {
205 Opt_sec_none, Opt_sec_sys,
206 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
207 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
208 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
209
210 Opt_sec_err
211 };
212
213 static const match_table_t nfs_secflavor_tokens = {
214 { Opt_sec_none, "none" },
215 { Opt_sec_none, "null" },
216 { Opt_sec_sys, "sys" },
217
218 { Opt_sec_krb5, "krb5" },
219 { Opt_sec_krb5i, "krb5i" },
220 { Opt_sec_krb5p, "krb5p" },
221
222 { Opt_sec_lkey, "lkey" },
223 { Opt_sec_lkeyi, "lkeyi" },
224 { Opt_sec_lkeyp, "lkeyp" },
225
226 { Opt_sec_spkm, "spkm3" },
227 { Opt_sec_spkmi, "spkm3i" },
228 { Opt_sec_spkmp, "spkm3p" },
229
230 { Opt_sec_err, NULL }
231 };
232
233 enum {
234 Opt_lookupcache_all, Opt_lookupcache_positive,
235 Opt_lookupcache_none,
236
237 Opt_lookupcache_err
238 };
239
240 static match_table_t nfs_lookupcache_tokens = {
241 { Opt_lookupcache_all, "all" },
242 { Opt_lookupcache_positive, "pos" },
243 { Opt_lookupcache_positive, "positive" },
244 { Opt_lookupcache_none, "none" },
245
246 { Opt_lookupcache_err, NULL }
247 };
248
249 enum {
250 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
251 Opt_local_lock_none,
252
253 Opt_local_lock_err
254 };
255
256 static match_table_t nfs_local_lock_tokens = {
257 { Opt_local_lock_all, "all" },
258 { Opt_local_lock_flock, "flock" },
259 { Opt_local_lock_posix, "posix" },
260 { Opt_local_lock_none, "none" },
261
262 { Opt_local_lock_err, NULL }
263 };
264
265 enum {
266 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
267 Opt_vers_4_1,
268
269 Opt_vers_err
270 };
271
272 static match_table_t nfs_vers_tokens = {
273 { Opt_vers_2, "2" },
274 { Opt_vers_3, "3" },
275 { Opt_vers_4, "4" },
276 { Opt_vers_4_0, "4.0" },
277 { Opt_vers_4_1, "4.1" },
278
279 { Opt_vers_err, NULL }
280 };
281
282 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data);
284
285 struct file_system_type nfs_fs_type = {
286 .owner = THIS_MODULE,
287 .name = "nfs",
288 .mount = nfs_fs_mount,
289 .kill_sb = nfs_kill_super,
290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
291 };
292 EXPORT_SYMBOL_GPL(nfs_fs_type);
293
294 struct file_system_type nfs_xdev_fs_type = {
295 .owner = THIS_MODULE,
296 .name = "nfs",
297 .mount = nfs_xdev_mount,
298 .kill_sb = nfs_kill_super,
299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
300 };
301
302 const struct super_operations nfs_sops = {
303 .alloc_inode = nfs_alloc_inode,
304 .destroy_inode = nfs_destroy_inode,
305 .write_inode = nfs_write_inode,
306 .put_super = nfs_put_super,
307 .statfs = nfs_statfs,
308 .evict_inode = nfs_evict_inode,
309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
311 .show_devname = nfs_show_devname,
312 .show_path = nfs_show_path,
313 .show_stats = nfs_show_stats,
314 .remount_fs = nfs_remount,
315 };
316 EXPORT_SYMBOL_GPL(nfs_sops);
317
318 #ifdef CONFIG_NFS_V4
319 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
320 static int nfs4_validate_mount_data(void *options,
321 struct nfs_parsed_mount_data *args, const char *dev_name);
322 #endif
323
324 static struct shrinker acl_shrinker = {
325 .shrink = nfs_access_cache_shrinker,
326 .seeks = DEFAULT_SEEKS,
327 };
328
329 /*
330 * Register the NFS filesystems
331 */
332 int __init register_nfs_fs(void)
333 {
334 int ret;
335
336 ret = register_filesystem(&nfs_fs_type);
337 if (ret < 0)
338 goto error_0;
339
340 ret = nfs_register_sysctl();
341 if (ret < 0)
342 goto error_1;
343 register_shrinker(&acl_shrinker);
344 return 0;
345
346 error_1:
347 unregister_filesystem(&nfs_fs_type);
348 error_0:
349 return ret;
350 }
351
352 /*
353 * Unregister the NFS filesystems
354 */
355 void __exit unregister_nfs_fs(void)
356 {
357 unregister_shrinker(&acl_shrinker);
358 nfs_unregister_sysctl();
359 unregister_filesystem(&nfs_fs_type);
360 }
361
362 void nfs_sb_active(struct super_block *sb)
363 {
364 struct nfs_server *server = NFS_SB(sb);
365
366 if (atomic_inc_return(&server->active) == 1)
367 atomic_inc(&sb->s_active);
368 }
369
370 void nfs_sb_deactive(struct super_block *sb)
371 {
372 struct nfs_server *server = NFS_SB(sb);
373
374 if (atomic_dec_and_test(&server->active))
375 deactivate_super(sb);
376 }
377
378 /*
379 * Deliver file system statistics to userspace
380 */
381 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
382 {
383 struct nfs_server *server = NFS_SB(dentry->d_sb);
384 unsigned char blockbits;
385 unsigned long blockres;
386 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
387 struct nfs_fsstat res;
388 int error = -ENOMEM;
389
390 res.fattr = nfs_alloc_fattr();
391 if (res.fattr == NULL)
392 goto out_err;
393
394 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
395 if (unlikely(error == -ESTALE)) {
396 struct dentry *pd_dentry;
397
398 pd_dentry = dget_parent(dentry);
399 if (pd_dentry != NULL) {
400 nfs_zap_caches(pd_dentry->d_inode);
401 dput(pd_dentry);
402 }
403 }
404 nfs_free_fattr(res.fattr);
405 if (error < 0)
406 goto out_err;
407
408 buf->f_type = NFS_SUPER_MAGIC;
409
410 /*
411 * Current versions of glibc do not correctly handle the
412 * case where f_frsize != f_bsize. Eventually we want to
413 * report the value of wtmult in this field.
414 */
415 buf->f_frsize = dentry->d_sb->s_blocksize;
416
417 /*
418 * On most *nix systems, f_blocks, f_bfree, and f_bavail
419 * are reported in units of f_frsize. Linux hasn't had
420 * an f_frsize field in its statfs struct until recently,
421 * thus historically Linux's sys_statfs reports these
422 * fields in units of f_bsize.
423 */
424 buf->f_bsize = dentry->d_sb->s_blocksize;
425 blockbits = dentry->d_sb->s_blocksize_bits;
426 blockres = (1 << blockbits) - 1;
427 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
428 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
429 buf->f_bavail = (res.abytes + blockres) >> blockbits;
430
431 buf->f_files = res.tfiles;
432 buf->f_ffree = res.afiles;
433
434 buf->f_namelen = server->namelen;
435
436 return 0;
437
438 out_err:
439 dprintk("%s: statfs error = %d\n", __func__, -error);
440 return error;
441 }
442
443 /*
444 * Map the security flavour number to a name
445 */
446 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
447 {
448 static const struct {
449 rpc_authflavor_t flavour;
450 const char *str;
451 } sec_flavours[] = {
452 { RPC_AUTH_NULL, "null" },
453 { RPC_AUTH_UNIX, "sys" },
454 { RPC_AUTH_GSS_KRB5, "krb5" },
455 { RPC_AUTH_GSS_KRB5I, "krb5i" },
456 { RPC_AUTH_GSS_KRB5P, "krb5p" },
457 { RPC_AUTH_GSS_LKEY, "lkey" },
458 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
459 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
460 { RPC_AUTH_GSS_SPKM, "spkm" },
461 { RPC_AUTH_GSS_SPKMI, "spkmi" },
462 { RPC_AUTH_GSS_SPKMP, "spkmp" },
463 { UINT_MAX, "unknown" }
464 };
465 int i;
466
467 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
468 if (sec_flavours[i].flavour == flavour)
469 break;
470 }
471 return sec_flavours[i].str;
472 }
473
474 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
475 int showdefaults)
476 {
477 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
478
479 seq_printf(m, ",mountproto=");
480 switch (sap->sa_family) {
481 case AF_INET:
482 switch (nfss->mountd_protocol) {
483 case IPPROTO_UDP:
484 seq_printf(m, RPCBIND_NETID_UDP);
485 break;
486 case IPPROTO_TCP:
487 seq_printf(m, RPCBIND_NETID_TCP);
488 break;
489 default:
490 if (showdefaults)
491 seq_printf(m, "auto");
492 }
493 break;
494 case AF_INET6:
495 switch (nfss->mountd_protocol) {
496 case IPPROTO_UDP:
497 seq_printf(m, RPCBIND_NETID_UDP6);
498 break;
499 case IPPROTO_TCP:
500 seq_printf(m, RPCBIND_NETID_TCP6);
501 break;
502 default:
503 if (showdefaults)
504 seq_printf(m, "auto");
505 }
506 break;
507 default:
508 if (showdefaults)
509 seq_printf(m, "auto");
510 }
511 }
512
513 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
514 int showdefaults)
515 {
516 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
517
518 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
519 return;
520
521 switch (sap->sa_family) {
522 case AF_INET: {
523 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
524 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
525 break;
526 }
527 case AF_INET6: {
528 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
529 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
530 break;
531 }
532 default:
533 if (showdefaults)
534 seq_printf(m, ",mountaddr=unspecified");
535 }
536
537 if (nfss->mountd_version || showdefaults)
538 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
539 if ((nfss->mountd_port &&
540 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
541 showdefaults)
542 seq_printf(m, ",mountport=%u", nfss->mountd_port);
543
544 nfs_show_mountd_netid(m, nfss, showdefaults);
545 }
546
547 #ifdef CONFIG_NFS_V4
548 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
549 int showdefaults)
550 {
551 struct nfs_client *clp = nfss->nfs_client;
552
553 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
554 }
555 #else
556 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
557 int showdefaults)
558 {
559 }
560 #endif
561
562 static void nfs_show_nfs_version(struct seq_file *m,
563 unsigned int version,
564 unsigned int minorversion)
565 {
566 seq_printf(m, ",vers=%u", version);
567 if (version == 4)
568 seq_printf(m, ".%u", minorversion);
569 }
570
571 /*
572 * Describe the mount options in force on this server representation
573 */
574 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
575 int showdefaults)
576 {
577 static const struct proc_nfs_info {
578 int flag;
579 const char *str;
580 const char *nostr;
581 } nfs_info[] = {
582 { NFS_MOUNT_SOFT, ",soft", ",hard" },
583 { NFS_MOUNT_POSIX, ",posix", "" },
584 { NFS_MOUNT_NOCTO, ",nocto", "" },
585 { NFS_MOUNT_NOAC, ",noac", "" },
586 { NFS_MOUNT_NONLM, ",nolock", "" },
587 { NFS_MOUNT_NOACL, ",noacl", "" },
588 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
589 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
590 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
591 { 0, NULL, NULL }
592 };
593 const struct proc_nfs_info *nfs_infop;
594 struct nfs_client *clp = nfss->nfs_client;
595 u32 version = clp->rpc_ops->version;
596 int local_flock, local_fcntl;
597
598 nfs_show_nfs_version(m, version, clp->cl_minorversion);
599 seq_printf(m, ",rsize=%u", nfss->rsize);
600 seq_printf(m, ",wsize=%u", nfss->wsize);
601 if (nfss->bsize != 0)
602 seq_printf(m, ",bsize=%u", nfss->bsize);
603 seq_printf(m, ",namlen=%u", nfss->namelen);
604 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
605 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
606 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
607 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
608 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
609 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
610 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
611 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
612 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
613 if (nfss->flags & nfs_infop->flag)
614 seq_puts(m, nfs_infop->str);
615 else
616 seq_puts(m, nfs_infop->nostr);
617 }
618 rcu_read_lock();
619 seq_printf(m, ",proto=%s",
620 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
621 rcu_read_unlock();
622 if (version == 4) {
623 if (nfss->port != NFS_PORT)
624 seq_printf(m, ",port=%u", nfss->port);
625 } else
626 if (nfss->port)
627 seq_printf(m, ",port=%u", nfss->port);
628
629 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
630 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
631 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
632
633 if (version != 4)
634 nfs_show_mountd_options(m, nfss, showdefaults);
635 else
636 nfs_show_nfsv4_options(m, nfss, showdefaults);
637
638 if (nfss->options & NFS_OPTION_FSCACHE)
639 seq_printf(m, ",fsc");
640
641 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
642 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
643 seq_printf(m, ",lookupcache=none");
644 else
645 seq_printf(m, ",lookupcache=pos");
646 }
647
648 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
649 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
650
651 if (!local_flock && !local_fcntl)
652 seq_printf(m, ",local_lock=none");
653 else if (local_flock && local_fcntl)
654 seq_printf(m, ",local_lock=all");
655 else if (local_flock)
656 seq_printf(m, ",local_lock=flock");
657 else
658 seq_printf(m, ",local_lock=posix");
659 }
660
661 /*
662 * Describe the mount options on this VFS mountpoint
663 */
664 int nfs_show_options(struct seq_file *m, struct dentry *root)
665 {
666 struct nfs_server *nfss = NFS_SB(root->d_sb);
667
668 nfs_show_mount_options(m, nfss, 0);
669
670 rcu_read_lock();
671 seq_printf(m, ",addr=%s",
672 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
673 RPC_DISPLAY_ADDR));
674 rcu_read_unlock();
675
676 return 0;
677 }
678
679 #ifdef CONFIG_NFS_V4
680 #ifdef CONFIG_NFS_V4_1
681 static void show_sessions(struct seq_file *m, struct nfs_server *server)
682 {
683 if (nfs4_has_session(server->nfs_client))
684 seq_printf(m, ",sessions");
685 }
686 #else
687 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
688 #endif
689 #endif
690
691 #ifdef CONFIG_NFS_V4_1
692 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
693 {
694 seq_printf(m, ",pnfs=");
695 if (server->pnfs_curr_ld)
696 seq_printf(m, "%s", server->pnfs_curr_ld->name);
697 else
698 seq_printf(m, "not configured");
699 }
700
701 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
702 {
703 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
704 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
705 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
706 "date='%llu,%u'",
707 impl_id->name, impl_id->domain,
708 impl_id->date.seconds, impl_id->date.nseconds);
709 }
710 }
711 #else
712 #ifdef CONFIG_NFS_V4
713 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
714 {
715 }
716 #endif
717 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
718 {
719 }
720 #endif
721
722 int nfs_show_devname(struct seq_file *m, struct dentry *root)
723 {
724 char *page = (char *) __get_free_page(GFP_KERNEL);
725 char *devname, *dummy;
726 int err = 0;
727 if (!page)
728 return -ENOMEM;
729 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
730 if (IS_ERR(devname))
731 err = PTR_ERR(devname);
732 else
733 seq_escape(m, devname, " \t\n\\");
734 free_page((unsigned long)page);
735 return err;
736 }
737
738 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
739 {
740 seq_puts(m, "/");
741 return 0;
742 }
743
744 /*
745 * Present statistical information for this VFS mountpoint
746 */
747 int nfs_show_stats(struct seq_file *m, struct dentry *root)
748 {
749 int i, cpu;
750 struct nfs_server *nfss = NFS_SB(root->d_sb);
751 struct rpc_auth *auth = nfss->client->cl_auth;
752 struct nfs_iostats totals = { };
753
754 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
755
756 /*
757 * Display all mount option settings
758 */
759 seq_printf(m, "\n\topts:\t");
760 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
761 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
762 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
763 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
764 nfs_show_mount_options(m, nfss, 1);
765
766 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
767
768 show_implementation_id(m, nfss);
769
770 seq_printf(m, "\n\tcaps:\t");
771 seq_printf(m, "caps=0x%x", nfss->caps);
772 seq_printf(m, ",wtmult=%u", nfss->wtmult);
773 seq_printf(m, ",dtsize=%u", nfss->dtsize);
774 seq_printf(m, ",bsize=%u", nfss->bsize);
775 seq_printf(m, ",namlen=%u", nfss->namelen);
776
777 #ifdef CONFIG_NFS_V4
778 if (nfss->nfs_client->rpc_ops->version == 4) {
779 seq_printf(m, "\n\tnfsv4:\t");
780 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
781 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
782 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
783 show_sessions(m, nfss);
784 show_pnfs(m, nfss);
785 }
786 #endif
787
788 /*
789 * Display security flavor in effect for this mount
790 */
791 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
792 if (auth->au_flavor)
793 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
794
795 /*
796 * Display superblock I/O counters
797 */
798 for_each_possible_cpu(cpu) {
799 struct nfs_iostats *stats;
800
801 preempt_disable();
802 stats = per_cpu_ptr(nfss->io_stats, cpu);
803
804 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
805 totals.events[i] += stats->events[i];
806 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
807 totals.bytes[i] += stats->bytes[i];
808 #ifdef CONFIG_NFS_FSCACHE
809 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
810 totals.fscache[i] += stats->fscache[i];
811 #endif
812
813 preempt_enable();
814 }
815
816 seq_printf(m, "\n\tevents:\t");
817 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
818 seq_printf(m, "%lu ", totals.events[i]);
819 seq_printf(m, "\n\tbytes:\t");
820 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
821 seq_printf(m, "%Lu ", totals.bytes[i]);
822 #ifdef CONFIG_NFS_FSCACHE
823 if (nfss->options & NFS_OPTION_FSCACHE) {
824 seq_printf(m, "\n\tfsc:\t");
825 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
826 seq_printf(m, "%Lu ", totals.bytes[i]);
827 }
828 #endif
829 seq_printf(m, "\n");
830
831 rpc_print_iostats(m, nfss->client);
832
833 return 0;
834 }
835
836 /*
837 * Begin unmount by attempting to remove all automounted mountpoints we added
838 * in response to xdev traversals and referrals
839 */
840 void nfs_umount_begin(struct super_block *sb)
841 {
842 struct nfs_server *server;
843 struct rpc_clnt *rpc;
844
845 server = NFS_SB(sb);
846 /* -EIO all pending I/O */
847 rpc = server->client_acl;
848 if (!IS_ERR(rpc))
849 rpc_killall_tasks(rpc);
850 rpc = server->client;
851 if (!IS_ERR(rpc))
852 rpc_killall_tasks(rpc);
853 }
854
855 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
856 {
857 struct nfs_parsed_mount_data *data;
858
859 data = kzalloc(sizeof(*data), GFP_KERNEL);
860 if (data) {
861 data->acregmin = NFS_DEF_ACREGMIN;
862 data->acregmax = NFS_DEF_ACREGMAX;
863 data->acdirmin = NFS_DEF_ACDIRMIN;
864 data->acdirmax = NFS_DEF_ACDIRMAX;
865 data->mount_server.port = NFS_UNSPEC_PORT;
866 data->nfs_server.port = NFS_UNSPEC_PORT;
867 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
868 data->auth_flavors[0] = RPC_AUTH_UNIX;
869 data->auth_flavor_len = 1;
870 data->minorversion = 0;
871 data->need_mount = true;
872 data->net = current->nsproxy->net_ns;
873 security_init_mnt_opts(&data->lsm_opts);
874 }
875 return data;
876 }
877
878 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
879 {
880 if (data) {
881 kfree(data->client_address);
882 kfree(data->mount_server.hostname);
883 kfree(data->nfs_server.export_path);
884 kfree(data->nfs_server.hostname);
885 kfree(data->fscache_uniq);
886 security_free_mnt_opts(&data->lsm_opts);
887 kfree(data);
888 }
889 }
890
891 /*
892 * Sanity-check a server address provided by the mount command.
893 *
894 * Address family must be initialized, and address must not be
895 * the ANY address for that family.
896 */
897 static int nfs_verify_server_address(struct sockaddr *addr)
898 {
899 switch (addr->sa_family) {
900 case AF_INET: {
901 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
902 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
903 }
904 case AF_INET6: {
905 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
906 return !ipv6_addr_any(sa);
907 }
908 }
909
910 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
911 return 0;
912 }
913
914 /*
915 * Select between a default port value and a user-specified port value.
916 * If a zero value is set, then autobind will be used.
917 */
918 static void nfs_set_port(struct sockaddr *sap, int *port,
919 const unsigned short default_port)
920 {
921 if (*port == NFS_UNSPEC_PORT)
922 *port = default_port;
923
924 rpc_set_port(sap, *port);
925 }
926
927 /*
928 * Sanity check the NFS transport protocol.
929 *
930 */
931 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
932 {
933 switch (mnt->nfs_server.protocol) {
934 case XPRT_TRANSPORT_UDP:
935 case XPRT_TRANSPORT_TCP:
936 case XPRT_TRANSPORT_RDMA:
937 break;
938 default:
939 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
940 }
941 }
942
943 /*
944 * For text based NFSv2/v3 mounts, the mount protocol transport default
945 * settings should depend upon the specified NFS transport.
946 */
947 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
948 {
949 nfs_validate_transport_protocol(mnt);
950
951 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
952 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
953 return;
954 switch (mnt->nfs_server.protocol) {
955 case XPRT_TRANSPORT_UDP:
956 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
957 break;
958 case XPRT_TRANSPORT_TCP:
959 case XPRT_TRANSPORT_RDMA:
960 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
961 }
962 }
963
964 /*
965 * Parse the value of the 'sec=' option.
966 */
967 static int nfs_parse_security_flavors(char *value,
968 struct nfs_parsed_mount_data *mnt)
969 {
970 substring_t args[MAX_OPT_ARGS];
971
972 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
973
974 switch (match_token(value, nfs_secflavor_tokens, args)) {
975 case Opt_sec_none:
976 mnt->auth_flavors[0] = RPC_AUTH_NULL;
977 break;
978 case Opt_sec_sys:
979 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
980 break;
981 case Opt_sec_krb5:
982 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
983 break;
984 case Opt_sec_krb5i:
985 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
986 break;
987 case Opt_sec_krb5p:
988 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
989 break;
990 case Opt_sec_lkey:
991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
992 break;
993 case Opt_sec_lkeyi:
994 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
995 break;
996 case Opt_sec_lkeyp:
997 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
998 break;
999 case Opt_sec_spkm:
1000 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1001 break;
1002 case Opt_sec_spkmi:
1003 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1004 break;
1005 case Opt_sec_spkmp:
1006 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1007 break;
1008 default:
1009 return 0;
1010 }
1011
1012 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1013 mnt->auth_flavor_len = 1;
1014 return 1;
1015 }
1016
1017 static int nfs_parse_version_string(char *string,
1018 struct nfs_parsed_mount_data *mnt,
1019 substring_t *args)
1020 {
1021 mnt->flags &= ~NFS_MOUNT_VER3;
1022 switch (match_token(string, nfs_vers_tokens, args)) {
1023 case Opt_vers_2:
1024 mnt->version = 2;
1025 break;
1026 case Opt_vers_3:
1027 mnt->flags |= NFS_MOUNT_VER3;
1028 mnt->version = 3;
1029 break;
1030 case Opt_vers_4:
1031 /* Backward compatibility option. In future,
1032 * the mount program should always supply
1033 * a NFSv4 minor version number.
1034 */
1035 mnt->version = 4;
1036 break;
1037 case Opt_vers_4_0:
1038 mnt->version = 4;
1039 mnt->minorversion = 0;
1040 break;
1041 case Opt_vers_4_1:
1042 mnt->version = 4;
1043 mnt->minorversion = 1;
1044 break;
1045 default:
1046 return 0;
1047 }
1048 return 1;
1049 }
1050
1051 static int nfs_get_option_str(substring_t args[], char **option)
1052 {
1053 kfree(*option);
1054 *option = match_strdup(args);
1055 return !option;
1056 }
1057
1058 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1059 {
1060 int rc;
1061 char *string;
1062
1063 string = match_strdup(args);
1064 if (string == NULL)
1065 return -ENOMEM;
1066 rc = strict_strtoul(string, 10, option);
1067 kfree(string);
1068
1069 return rc;
1070 }
1071
1072 /*
1073 * Error-check and convert a string of mount options from user space into
1074 * a data structure. The whole mount string is processed; bad options are
1075 * skipped as they are encountered. If there were no errors, return 1;
1076 * otherwise return 0 (zero).
1077 */
1078 static int nfs_parse_mount_options(char *raw,
1079 struct nfs_parsed_mount_data *mnt)
1080 {
1081 char *p, *string, *secdata;
1082 int rc, sloppy = 0, invalid_option = 0;
1083 unsigned short protofamily = AF_UNSPEC;
1084 unsigned short mountfamily = AF_UNSPEC;
1085
1086 if (!raw) {
1087 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1088 return 1;
1089 }
1090 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1091
1092 secdata = alloc_secdata();
1093 if (!secdata)
1094 goto out_nomem;
1095
1096 rc = security_sb_copy_data(raw, secdata);
1097 if (rc)
1098 goto out_security_failure;
1099
1100 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1101 if (rc)
1102 goto out_security_failure;
1103
1104 free_secdata(secdata);
1105
1106 while ((p = strsep(&raw, ",")) != NULL) {
1107 substring_t args[MAX_OPT_ARGS];
1108 unsigned long option;
1109 int token;
1110
1111 if (!*p)
1112 continue;
1113
1114 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1115
1116 token = match_token(p, nfs_mount_option_tokens, args);
1117 switch (token) {
1118
1119 /*
1120 * boolean options: foo/nofoo
1121 */
1122 case Opt_soft:
1123 mnt->flags |= NFS_MOUNT_SOFT;
1124 break;
1125 case Opt_hard:
1126 mnt->flags &= ~NFS_MOUNT_SOFT;
1127 break;
1128 case Opt_posix:
1129 mnt->flags |= NFS_MOUNT_POSIX;
1130 break;
1131 case Opt_noposix:
1132 mnt->flags &= ~NFS_MOUNT_POSIX;
1133 break;
1134 case Opt_cto:
1135 mnt->flags &= ~NFS_MOUNT_NOCTO;
1136 break;
1137 case Opt_nocto:
1138 mnt->flags |= NFS_MOUNT_NOCTO;
1139 break;
1140 case Opt_ac:
1141 mnt->flags &= ~NFS_MOUNT_NOAC;
1142 break;
1143 case Opt_noac:
1144 mnt->flags |= NFS_MOUNT_NOAC;
1145 break;
1146 case Opt_lock:
1147 mnt->flags &= ~NFS_MOUNT_NONLM;
1148 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1149 NFS_MOUNT_LOCAL_FCNTL);
1150 break;
1151 case Opt_nolock:
1152 mnt->flags |= NFS_MOUNT_NONLM;
1153 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1154 NFS_MOUNT_LOCAL_FCNTL);
1155 break;
1156 case Opt_udp:
1157 mnt->flags &= ~NFS_MOUNT_TCP;
1158 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1159 break;
1160 case Opt_tcp:
1161 mnt->flags |= NFS_MOUNT_TCP;
1162 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1163 break;
1164 case Opt_rdma:
1165 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1166 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1167 xprt_load_transport(p);
1168 break;
1169 case Opt_acl:
1170 mnt->flags &= ~NFS_MOUNT_NOACL;
1171 break;
1172 case Opt_noacl:
1173 mnt->flags |= NFS_MOUNT_NOACL;
1174 break;
1175 case Opt_rdirplus:
1176 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1177 break;
1178 case Opt_nordirplus:
1179 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1180 break;
1181 case Opt_sharecache:
1182 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1183 break;
1184 case Opt_nosharecache:
1185 mnt->flags |= NFS_MOUNT_UNSHARED;
1186 break;
1187 case Opt_resvport:
1188 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1189 break;
1190 case Opt_noresvport:
1191 mnt->flags |= NFS_MOUNT_NORESVPORT;
1192 break;
1193 case Opt_fscache:
1194 mnt->options |= NFS_OPTION_FSCACHE;
1195 kfree(mnt->fscache_uniq);
1196 mnt->fscache_uniq = NULL;
1197 break;
1198 case Opt_nofscache:
1199 mnt->options &= ~NFS_OPTION_FSCACHE;
1200 kfree(mnt->fscache_uniq);
1201 mnt->fscache_uniq = NULL;
1202 break;
1203
1204 /*
1205 * options that take numeric values
1206 */
1207 case Opt_port:
1208 if (nfs_get_option_ul(args, &option) ||
1209 option > USHRT_MAX)
1210 goto out_invalid_value;
1211 mnt->nfs_server.port = option;
1212 break;
1213 case Opt_rsize:
1214 if (nfs_get_option_ul(args, &option))
1215 goto out_invalid_value;
1216 mnt->rsize = option;
1217 break;
1218 case Opt_wsize:
1219 if (nfs_get_option_ul(args, &option))
1220 goto out_invalid_value;
1221 mnt->wsize = option;
1222 break;
1223 case Opt_bsize:
1224 if (nfs_get_option_ul(args, &option))
1225 goto out_invalid_value;
1226 mnt->bsize = option;
1227 break;
1228 case Opt_timeo:
1229 if (nfs_get_option_ul(args, &option) || option == 0)
1230 goto out_invalid_value;
1231 mnt->timeo = option;
1232 break;
1233 case Opt_retrans:
1234 if (nfs_get_option_ul(args, &option) || option == 0)
1235 goto out_invalid_value;
1236 mnt->retrans = option;
1237 break;
1238 case Opt_acregmin:
1239 if (nfs_get_option_ul(args, &option))
1240 goto out_invalid_value;
1241 mnt->acregmin = option;
1242 break;
1243 case Opt_acregmax:
1244 if (nfs_get_option_ul(args, &option))
1245 goto out_invalid_value;
1246 mnt->acregmax = option;
1247 break;
1248 case Opt_acdirmin:
1249 if (nfs_get_option_ul(args, &option))
1250 goto out_invalid_value;
1251 mnt->acdirmin = option;
1252 break;
1253 case Opt_acdirmax:
1254 if (nfs_get_option_ul(args, &option))
1255 goto out_invalid_value;
1256 mnt->acdirmax = option;
1257 break;
1258 case Opt_actimeo:
1259 if (nfs_get_option_ul(args, &option))
1260 goto out_invalid_value;
1261 mnt->acregmin = mnt->acregmax =
1262 mnt->acdirmin = mnt->acdirmax = option;
1263 break;
1264 case Opt_namelen:
1265 if (nfs_get_option_ul(args, &option))
1266 goto out_invalid_value;
1267 mnt->namlen = option;
1268 break;
1269 case Opt_mountport:
1270 if (nfs_get_option_ul(args, &option) ||
1271 option > USHRT_MAX)
1272 goto out_invalid_value;
1273 mnt->mount_server.port = option;
1274 break;
1275 case Opt_mountvers:
1276 if (nfs_get_option_ul(args, &option) ||
1277 option < NFS_MNT_VERSION ||
1278 option > NFS_MNT3_VERSION)
1279 goto out_invalid_value;
1280 mnt->mount_server.version = option;
1281 break;
1282 case Opt_minorversion:
1283 if (nfs_get_option_ul(args, &option))
1284 goto out_invalid_value;
1285 if (option > NFS4_MAX_MINOR_VERSION)
1286 goto out_invalid_value;
1287 mnt->minorversion = option;
1288 break;
1289
1290 /*
1291 * options that take text values
1292 */
1293 case Opt_nfsvers:
1294 string = match_strdup(args);
1295 if (string == NULL)
1296 goto out_nomem;
1297 rc = nfs_parse_version_string(string, mnt, args);
1298 kfree(string);
1299 if (!rc)
1300 goto out_invalid_value;
1301 break;
1302 case Opt_sec:
1303 string = match_strdup(args);
1304 if (string == NULL)
1305 goto out_nomem;
1306 rc = nfs_parse_security_flavors(string, mnt);
1307 kfree(string);
1308 if (!rc) {
1309 dfprintk(MOUNT, "NFS: unrecognized "
1310 "security flavor\n");
1311 return 0;
1312 }
1313 break;
1314 case Opt_proto:
1315 string = match_strdup(args);
1316 if (string == NULL)
1317 goto out_nomem;
1318 token = match_token(string,
1319 nfs_xprt_protocol_tokens, args);
1320
1321 protofamily = AF_INET;
1322 switch (token) {
1323 case Opt_xprt_udp6:
1324 protofamily = AF_INET6;
1325 case Opt_xprt_udp:
1326 mnt->flags &= ~NFS_MOUNT_TCP;
1327 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1328 break;
1329 case Opt_xprt_tcp6:
1330 protofamily = AF_INET6;
1331 case Opt_xprt_tcp:
1332 mnt->flags |= NFS_MOUNT_TCP;
1333 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1334 break;
1335 case Opt_xprt_rdma:
1336 /* vector side protocols to TCP */
1337 mnt->flags |= NFS_MOUNT_TCP;
1338 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1339 xprt_load_transport(string);
1340 break;
1341 default:
1342 dfprintk(MOUNT, "NFS: unrecognized "
1343 "transport protocol\n");
1344 kfree(string);
1345 return 0;
1346 }
1347 kfree(string);
1348 break;
1349 case Opt_mountproto:
1350 string = match_strdup(args);
1351 if (string == NULL)
1352 goto out_nomem;
1353 token = match_token(string,
1354 nfs_xprt_protocol_tokens, args);
1355 kfree(string);
1356
1357 mountfamily = AF_INET;
1358 switch (token) {
1359 case Opt_xprt_udp6:
1360 mountfamily = AF_INET6;
1361 case Opt_xprt_udp:
1362 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1363 break;
1364 case Opt_xprt_tcp6:
1365 mountfamily = AF_INET6;
1366 case Opt_xprt_tcp:
1367 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1368 break;
1369 case Opt_xprt_rdma: /* not used for side protocols */
1370 default:
1371 dfprintk(MOUNT, "NFS: unrecognized "
1372 "transport protocol\n");
1373 return 0;
1374 }
1375 break;
1376 case Opt_addr:
1377 string = match_strdup(args);
1378 if (string == NULL)
1379 goto out_nomem;
1380 mnt->nfs_server.addrlen =
1381 rpc_pton(mnt->net, string, strlen(string),
1382 (struct sockaddr *)
1383 &mnt->nfs_server.address,
1384 sizeof(mnt->nfs_server.address));
1385 kfree(string);
1386 if (mnt->nfs_server.addrlen == 0)
1387 goto out_invalid_address;
1388 break;
1389 case Opt_clientaddr:
1390 if (nfs_get_option_str(args, &mnt->client_address))
1391 goto out_nomem;
1392 break;
1393 case Opt_mounthost:
1394 if (nfs_get_option_str(args,
1395 &mnt->mount_server.hostname))
1396 goto out_nomem;
1397 break;
1398 case Opt_mountaddr:
1399 string = match_strdup(args);
1400 if (string == NULL)
1401 goto out_nomem;
1402 mnt->mount_server.addrlen =
1403 rpc_pton(mnt->net, string, strlen(string),
1404 (struct sockaddr *)
1405 &mnt->mount_server.address,
1406 sizeof(mnt->mount_server.address));
1407 kfree(string);
1408 if (mnt->mount_server.addrlen == 0)
1409 goto out_invalid_address;
1410 break;
1411 case Opt_lookupcache:
1412 string = match_strdup(args);
1413 if (string == NULL)
1414 goto out_nomem;
1415 token = match_token(string,
1416 nfs_lookupcache_tokens, args);
1417 kfree(string);
1418 switch (token) {
1419 case Opt_lookupcache_all:
1420 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1421 break;
1422 case Opt_lookupcache_positive:
1423 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1424 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1425 break;
1426 case Opt_lookupcache_none:
1427 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1428 break;
1429 default:
1430 dfprintk(MOUNT, "NFS: invalid "
1431 "lookupcache argument\n");
1432 return 0;
1433 };
1434 break;
1435 case Opt_fscache_uniq:
1436 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1437 goto out_nomem;
1438 mnt->options |= NFS_OPTION_FSCACHE;
1439 break;
1440 case Opt_local_lock:
1441 string = match_strdup(args);
1442 if (string == NULL)
1443 goto out_nomem;
1444 token = match_token(string, nfs_local_lock_tokens,
1445 args);
1446 kfree(string);
1447 switch (token) {
1448 case Opt_local_lock_all:
1449 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1450 NFS_MOUNT_LOCAL_FCNTL);
1451 break;
1452 case Opt_local_lock_flock:
1453 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1454 break;
1455 case Opt_local_lock_posix:
1456 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1457 break;
1458 case Opt_local_lock_none:
1459 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1460 NFS_MOUNT_LOCAL_FCNTL);
1461 break;
1462 default:
1463 dfprintk(MOUNT, "NFS: invalid "
1464 "local_lock argument\n");
1465 return 0;
1466 };
1467 break;
1468
1469 /*
1470 * Special options
1471 */
1472 case Opt_sloppy:
1473 sloppy = 1;
1474 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1475 break;
1476 case Opt_userspace:
1477 case Opt_deprecated:
1478 dfprintk(MOUNT, "NFS: ignoring mount option "
1479 "'%s'\n", p);
1480 break;
1481
1482 default:
1483 invalid_option = 1;
1484 dfprintk(MOUNT, "NFS: unrecognized mount option "
1485 "'%s'\n", p);
1486 }
1487 }
1488
1489 if (!sloppy && invalid_option)
1490 return 0;
1491
1492 if (mnt->minorversion && mnt->version != 4)
1493 goto out_minorversion_mismatch;
1494
1495 /*
1496 * verify that any proto=/mountproto= options match the address
1497 * familiies in the addr=/mountaddr= options.
1498 */
1499 if (protofamily != AF_UNSPEC &&
1500 protofamily != mnt->nfs_server.address.ss_family)
1501 goto out_proto_mismatch;
1502
1503 if (mountfamily != AF_UNSPEC) {
1504 if (mnt->mount_server.addrlen) {
1505 if (mountfamily != mnt->mount_server.address.ss_family)
1506 goto out_mountproto_mismatch;
1507 } else {
1508 if (mountfamily != mnt->nfs_server.address.ss_family)
1509 goto out_mountproto_mismatch;
1510 }
1511 }
1512
1513 return 1;
1514
1515 out_mountproto_mismatch:
1516 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1517 "option\n");
1518 return 0;
1519 out_proto_mismatch:
1520 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1521 return 0;
1522 out_invalid_address:
1523 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1524 return 0;
1525 out_invalid_value:
1526 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1527 return 0;
1528 out_minorversion_mismatch:
1529 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1530 "minorversion=%u\n", mnt->version, mnt->minorversion);
1531 return 0;
1532 out_nomem:
1533 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1534 return 0;
1535 out_security_failure:
1536 free_secdata(secdata);
1537 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1538 return 0;
1539 }
1540
1541 /*
1542 * Match the requested auth flavors with the list returned by
1543 * the server. Returns zero and sets the mount's authentication
1544 * flavor on success; returns -EACCES if server does not support
1545 * the requested flavor.
1546 */
1547 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1548 struct nfs_mount_request *request)
1549 {
1550 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1551
1552 /*
1553 * Certain releases of Linux's mountd return an empty
1554 * flavor list. To prevent behavioral regression with
1555 * these servers (ie. rejecting mounts that used to
1556 * succeed), revert to pre-2.6.32 behavior (no checking)
1557 * if the returned flavor list is empty.
1558 */
1559 if (server_authlist_len == 0)
1560 return 0;
1561
1562 /*
1563 * We avoid sophisticated negotiating here, as there are
1564 * plenty of cases where we can get it wrong, providing
1565 * either too little or too much security.
1566 *
1567 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1568 * flavor listed first. However, some servers list
1569 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1570 * preferred default, in args->auth_flavors[0] if user
1571 * didn't specify sec= mount option.
1572 */
1573 for (i = 0; i < args->auth_flavor_len; i++)
1574 for (j = 0; j < server_authlist_len; j++)
1575 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1576 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1577 request->auth_flavs[j]);
1578 args->auth_flavors[0] = request->auth_flavs[j];
1579 return 0;
1580 }
1581
1582 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1583 nfs_umount(request);
1584 return -EACCES;
1585 }
1586
1587 /*
1588 * Use the remote server's MOUNT service to request the NFS file handle
1589 * corresponding to the provided path.
1590 */
1591 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1592 struct nfs_fh *root_fh)
1593 {
1594 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1595 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1596 struct nfs_mount_request request = {
1597 .sap = (struct sockaddr *)
1598 &args->mount_server.address,
1599 .dirpath = args->nfs_server.export_path,
1600 .protocol = args->mount_server.protocol,
1601 .fh = root_fh,
1602 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1603 .auth_flav_len = &server_authlist_len,
1604 .auth_flavs = server_authlist,
1605 .net = args->net,
1606 };
1607 int status;
1608
1609 if (args->mount_server.version == 0) {
1610 switch (args->version) {
1611 default:
1612 args->mount_server.version = NFS_MNT3_VERSION;
1613 break;
1614 case 2:
1615 args->mount_server.version = NFS_MNT_VERSION;
1616 }
1617 }
1618 request.version = args->mount_server.version;
1619
1620 if (args->mount_server.hostname)
1621 request.hostname = args->mount_server.hostname;
1622 else
1623 request.hostname = args->nfs_server.hostname;
1624
1625 /*
1626 * Construct the mount server's address.
1627 */
1628 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1629 memcpy(request.sap, &args->nfs_server.address,
1630 args->nfs_server.addrlen);
1631 args->mount_server.addrlen = args->nfs_server.addrlen;
1632 }
1633 request.salen = args->mount_server.addrlen;
1634 nfs_set_port(request.sap, &args->mount_server.port, 0);
1635
1636 /*
1637 * Now ask the mount server to map our export path
1638 * to a file handle.
1639 */
1640 status = nfs_mount(&request);
1641 if (status != 0) {
1642 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1643 request.hostname, status);
1644 return status;
1645 }
1646
1647 /*
1648 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1649 */
1650 if (args->mount_server.version != NFS_MNT3_VERSION)
1651 return 0;
1652 return nfs_walk_authlist(args, &request);
1653 }
1654
1655 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1656 struct nfs_mount_info *mount_info,
1657 struct nfs_subversion *nfs_mod)
1658 {
1659 int status;
1660 struct nfs_server *server;
1661
1662 if (mount_info->parsed->need_mount) {
1663 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1664 if (status)
1665 return ERR_PTR(status);
1666 }
1667
1668 /* Get a volume representation */
1669 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1670 if (IS_ERR(server))
1671 return ERR_CAST(server);
1672
1673 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1674 }
1675 EXPORT_SYMBOL_GPL(nfs_try_mount);
1676
1677 /*
1678 * Split "dev_name" into "hostname:export_path".
1679 *
1680 * The leftmost colon demarks the split between the server's hostname
1681 * and the export path. If the hostname starts with a left square
1682 * bracket, then it may contain colons.
1683 *
1684 * Note: caller frees hostname and export path, even on error.
1685 */
1686 static int nfs_parse_devname(const char *dev_name,
1687 char **hostname, size_t maxnamlen,
1688 char **export_path, size_t maxpathlen)
1689 {
1690 size_t len;
1691 char *end;
1692
1693 /* Is the host name protected with square brakcets? */
1694 if (*dev_name == '[') {
1695 end = strchr(++dev_name, ']');
1696 if (end == NULL || end[1] != ':')
1697 goto out_bad_devname;
1698
1699 len = end - dev_name;
1700 end++;
1701 } else {
1702 char *comma;
1703
1704 end = strchr(dev_name, ':');
1705 if (end == NULL)
1706 goto out_bad_devname;
1707 len = end - dev_name;
1708
1709 /* kill possible hostname list: not supported */
1710 comma = strchr(dev_name, ',');
1711 if (comma != NULL && comma < end)
1712 *comma = 0;
1713 }
1714
1715 if (len > maxnamlen)
1716 goto out_hostname;
1717
1718 /* N.B. caller will free nfs_server.hostname in all cases */
1719 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1720 if (*hostname == NULL)
1721 goto out_nomem;
1722 len = strlen(++end);
1723 if (len > maxpathlen)
1724 goto out_path;
1725 *export_path = kstrndup(end, len, GFP_KERNEL);
1726 if (!*export_path)
1727 goto out_nomem;
1728
1729 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1730 return 0;
1731
1732 out_bad_devname:
1733 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1734 return -EINVAL;
1735
1736 out_nomem:
1737 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1738 return -ENOMEM;
1739
1740 out_hostname:
1741 dfprintk(MOUNT, "NFS: server hostname too long\n");
1742 return -ENAMETOOLONG;
1743
1744 out_path:
1745 dfprintk(MOUNT, "NFS: export pathname too long\n");
1746 return -ENAMETOOLONG;
1747 }
1748
1749 /*
1750 * Validate the NFS2/NFS3 mount data
1751 * - fills in the mount root filehandle
1752 *
1753 * For option strings, user space handles the following behaviors:
1754 *
1755 * + DNS: mapping server host name to IP address ("addr=" option)
1756 *
1757 * + failure mode: how to behave if a mount request can't be handled
1758 * immediately ("fg/bg" option)
1759 *
1760 * + retry: how often to retry a mount request ("retry=" option)
1761 *
1762 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1763 * mountproto=tcp after mountproto=udp, and so on
1764 */
1765 static int nfs23_validate_mount_data(void *options,
1766 struct nfs_parsed_mount_data *args,
1767 struct nfs_fh *mntfh,
1768 const char *dev_name)
1769 {
1770 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1771 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1772
1773 if (data == NULL)
1774 goto out_no_data;
1775
1776 args->version = NFS_DEFAULT_VERSION;
1777 switch (data->version) {
1778 case 1:
1779 data->namlen = 0;
1780 case 2:
1781 data->bsize = 0;
1782 case 3:
1783 if (data->flags & NFS_MOUNT_VER3)
1784 goto out_no_v3;
1785 data->root.size = NFS2_FHSIZE;
1786 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1787 case 4:
1788 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1789 goto out_no_sec;
1790 case 5:
1791 memset(data->context, 0, sizeof(data->context));
1792 case 6:
1793 if (data->flags & NFS_MOUNT_VER3) {
1794 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1795 goto out_invalid_fh;
1796 mntfh->size = data->root.size;
1797 args->version = 3;
1798 } else {
1799 mntfh->size = NFS2_FHSIZE;
1800 args->version = 2;
1801 }
1802
1803
1804 memcpy(mntfh->data, data->root.data, mntfh->size);
1805 if (mntfh->size < sizeof(mntfh->data))
1806 memset(mntfh->data + mntfh->size, 0,
1807 sizeof(mntfh->data) - mntfh->size);
1808
1809 /*
1810 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1811 * can deal with.
1812 */
1813 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1814 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1815 args->rsize = data->rsize;
1816 args->wsize = data->wsize;
1817 args->timeo = data->timeo;
1818 args->retrans = data->retrans;
1819 args->acregmin = data->acregmin;
1820 args->acregmax = data->acregmax;
1821 args->acdirmin = data->acdirmin;
1822 args->acdirmax = data->acdirmax;
1823 args->need_mount = false;
1824
1825 memcpy(sap, &data->addr, sizeof(data->addr));
1826 args->nfs_server.addrlen = sizeof(data->addr);
1827 if (!nfs_verify_server_address(sap))
1828 goto out_no_address;
1829
1830 if (!(data->flags & NFS_MOUNT_TCP))
1831 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1832 /* N.B. caller will free nfs_server.hostname in all cases */
1833 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1834 args->namlen = data->namlen;
1835 args->bsize = data->bsize;
1836
1837 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1838 args->auth_flavors[0] = data->pseudoflavor;
1839 if (!args->nfs_server.hostname)
1840 goto out_nomem;
1841
1842 if (!(data->flags & NFS_MOUNT_NONLM))
1843 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1844 NFS_MOUNT_LOCAL_FCNTL);
1845 else
1846 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1847 NFS_MOUNT_LOCAL_FCNTL);
1848 /*
1849 * The legacy version 6 binary mount data from userspace has a
1850 * field used only to transport selinux information into the
1851 * the kernel. To continue to support that functionality we
1852 * have a touch of selinux knowledge here in the NFS code. The
1853 * userspace code converted context=blah to just blah so we are
1854 * converting back to the full string selinux understands.
1855 */
1856 if (data->context[0]){
1857 #ifdef CONFIG_SECURITY_SELINUX
1858 int rc;
1859 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1860 if (!opts_str)
1861 return -ENOMEM;
1862 strcpy(opts_str, "context=");
1863 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1864 strcat(opts_str, &data->context[0]);
1865 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1866 kfree(opts_str);
1867 if (rc)
1868 return rc;
1869 #else
1870 return -EINVAL;
1871 #endif
1872 }
1873
1874 break;
1875 default:
1876 return NFS_TEXT_DATA;
1877 }
1878
1879 #ifndef CONFIG_NFS_V3
1880 if (args->version == 3)
1881 goto out_v3_not_compiled;
1882 #endif /* !CONFIG_NFS_V3 */
1883
1884 return 0;
1885
1886 out_no_data:
1887 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1888 return -EINVAL;
1889
1890 out_no_v3:
1891 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1892 data->version);
1893 return -EINVAL;
1894
1895 out_no_sec:
1896 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1897 return -EINVAL;
1898
1899 #ifndef CONFIG_NFS_V3
1900 out_v3_not_compiled:
1901 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1902 return -EPROTONOSUPPORT;
1903 #endif /* !CONFIG_NFS_V3 */
1904
1905 out_nomem:
1906 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1907 return -ENOMEM;
1908
1909 out_no_address:
1910 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1911 return -EINVAL;
1912
1913 out_invalid_fh:
1914 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1915 return -EINVAL;
1916 }
1917
1918 #ifdef CONFIG_NFS_V4
1919 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1920 void *options,
1921 struct nfs_parsed_mount_data *args,
1922 struct nfs_fh *mntfh,
1923 const char *dev_name)
1924 {
1925 if (fs_type == &nfs_fs_type)
1926 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1927 return nfs4_validate_mount_data(options, args, dev_name);
1928 }
1929 #else
1930 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1931 void *options,
1932 struct nfs_parsed_mount_data *args,
1933 struct nfs_fh *mntfh,
1934 const char *dev_name)
1935 {
1936 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1937 }
1938 #endif
1939
1940 static int nfs_validate_text_mount_data(void *options,
1941 struct nfs_parsed_mount_data *args,
1942 const char *dev_name)
1943 {
1944 int port = 0;
1945 int max_namelen = PAGE_SIZE;
1946 int max_pathlen = NFS_MAXPATHLEN;
1947 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1948
1949 if (nfs_parse_mount_options((char *)options, args) == 0)
1950 return -EINVAL;
1951
1952 if (!nfs_verify_server_address(sap))
1953 goto out_no_address;
1954
1955 if (args->version == 4) {
1956 #ifdef CONFIG_NFS_V4
1957 port = NFS_PORT;
1958 max_namelen = NFS4_MAXNAMLEN;
1959 max_pathlen = NFS4_MAXPATHLEN;
1960 nfs_validate_transport_protocol(args);
1961 nfs4_validate_mount_flags(args);
1962 #else
1963 goto out_v4_not_compiled;
1964 #endif /* CONFIG_NFS_V4 */
1965 } else
1966 nfs_set_mount_transport_protocol(args);
1967
1968 nfs_set_port(sap, &args->nfs_server.port, port);
1969
1970 if (args->auth_flavor_len > 1)
1971 goto out_bad_auth;
1972
1973 return nfs_parse_devname(dev_name,
1974 &args->nfs_server.hostname,
1975 max_namelen,
1976 &args->nfs_server.export_path,
1977 max_pathlen);
1978
1979 #ifndef CONFIG_NFS_V4
1980 out_v4_not_compiled:
1981 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1982 return -EPROTONOSUPPORT;
1983 #endif /* !CONFIG_NFS_V4 */
1984
1985 out_no_address:
1986 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1987 return -EINVAL;
1988
1989 out_bad_auth:
1990 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
1991 return -EINVAL;
1992 }
1993
1994 static int
1995 nfs_compare_remount_data(struct nfs_server *nfss,
1996 struct nfs_parsed_mount_data *data)
1997 {
1998 if (data->flags != nfss->flags ||
1999 data->rsize != nfss->rsize ||
2000 data->wsize != nfss->wsize ||
2001 data->retrans != nfss->client->cl_timeout->to_retries ||
2002 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2003 data->acregmin != nfss->acregmin / HZ ||
2004 data->acregmax != nfss->acregmax / HZ ||
2005 data->acdirmin != nfss->acdirmin / HZ ||
2006 data->acdirmax != nfss->acdirmax / HZ ||
2007 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2008 data->nfs_server.port != nfss->port ||
2009 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2010 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2011 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2012 return -EINVAL;
2013
2014 return 0;
2015 }
2016
2017 int
2018 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2019 {
2020 int error;
2021 struct nfs_server *nfss = sb->s_fs_info;
2022 struct nfs_parsed_mount_data *data;
2023 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2024 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2025 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2026
2027 /*
2028 * Userspace mount programs that send binary options generally send
2029 * them populated with default values. We have no way to know which
2030 * ones were explicitly specified. Fall back to legacy behavior and
2031 * just return success.
2032 */
2033 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2034 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2035 options->version <= 6))))
2036 return 0;
2037
2038 data = kzalloc(sizeof(*data), GFP_KERNEL);
2039 if (data == NULL)
2040 return -ENOMEM;
2041
2042 /* fill out struct with values from existing mount */
2043 data->flags = nfss->flags;
2044 data->rsize = nfss->rsize;
2045 data->wsize = nfss->wsize;
2046 data->retrans = nfss->client->cl_timeout->to_retries;
2047 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2048 data->acregmin = nfss->acregmin / HZ;
2049 data->acregmax = nfss->acregmax / HZ;
2050 data->acdirmin = nfss->acdirmin / HZ;
2051 data->acdirmax = nfss->acdirmax / HZ;
2052 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2053 data->nfs_server.port = nfss->port;
2054 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2055 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2056 data->nfs_server.addrlen);
2057
2058 /* overwrite those values with any that were specified */
2059 error = nfs_parse_mount_options((char *)options, data);
2060 if (error < 0)
2061 goto out;
2062
2063 /*
2064 * noac is a special case. It implies -o sync, but that's not
2065 * necessarily reflected in the mtab options. do_remount_sb
2066 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2067 * remount options, so we have to explicitly reset it.
2068 */
2069 if (data->flags & NFS_MOUNT_NOAC)
2070 *flags |= MS_SYNCHRONOUS;
2071
2072 /* compare new mount options with old ones */
2073 error = nfs_compare_remount_data(nfss, data);
2074 out:
2075 kfree(data);
2076 return error;
2077 }
2078
2079 /*
2080 * Initialise the common bits of the superblock
2081 */
2082 inline void nfs_initialise_sb(struct super_block *sb)
2083 {
2084 struct nfs_server *server = NFS_SB(sb);
2085
2086 sb->s_magic = NFS_SUPER_MAGIC;
2087
2088 /* We probably want something more informative here */
2089 snprintf(sb->s_id, sizeof(sb->s_id),
2090 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2091
2092 if (sb->s_blocksize == 0)
2093 sb->s_blocksize = nfs_block_bits(server->wsize,
2094 &sb->s_blocksize_bits);
2095
2096 sb->s_bdi = &server->backing_dev_info;
2097
2098 nfs_super_set_maxbytes(sb, server->maxfilesize);
2099 }
2100
2101 /*
2102 * Finish setting up an NFS2/3 superblock
2103 */
2104 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2105 {
2106 struct nfs_parsed_mount_data *data = mount_info->parsed;
2107 struct nfs_server *server = NFS_SB(sb);
2108
2109 sb->s_blocksize_bits = 0;
2110 sb->s_blocksize = 0;
2111 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2112 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2113 if (data && data->bsize)
2114 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2115
2116 if (server->nfs_client->rpc_ops->version != 2) {
2117 /* The VFS shouldn't apply the umask to mode bits. We will do
2118 * so ourselves when necessary.
2119 */
2120 sb->s_flags |= MS_POSIXACL;
2121 sb->s_time_gran = 1;
2122 }
2123
2124 nfs_initialise_sb(sb);
2125 }
2126
2127 /*
2128 * Finish setting up a cloned NFS2/3/4 superblock
2129 */
2130 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2131 {
2132 const struct super_block *old_sb = mount_info->cloned->sb;
2133 struct nfs_server *server = NFS_SB(sb);
2134
2135 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2136 sb->s_blocksize = old_sb->s_blocksize;
2137 sb->s_maxbytes = old_sb->s_maxbytes;
2138 sb->s_xattr = old_sb->s_xattr;
2139 sb->s_op = old_sb->s_op;
2140 sb->s_time_gran = 1;
2141
2142 if (server->nfs_client->rpc_ops->version != 2) {
2143 /* The VFS shouldn't apply the umask to mode bits. We will do
2144 * so ourselves when necessary.
2145 */
2146 sb->s_flags |= MS_POSIXACL;
2147 }
2148
2149 nfs_initialise_sb(sb);
2150 }
2151
2152 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2153 {
2154 const struct nfs_server *a = s->s_fs_info;
2155 const struct rpc_clnt *clnt_a = a->client;
2156 const struct rpc_clnt *clnt_b = b->client;
2157
2158 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2159 goto Ebusy;
2160 if (a->nfs_client != b->nfs_client)
2161 goto Ebusy;
2162 if (a->flags != b->flags)
2163 goto Ebusy;
2164 if (a->wsize != b->wsize)
2165 goto Ebusy;
2166 if (a->rsize != b->rsize)
2167 goto Ebusy;
2168 if (a->acregmin != b->acregmin)
2169 goto Ebusy;
2170 if (a->acregmax != b->acregmax)
2171 goto Ebusy;
2172 if (a->acdirmin != b->acdirmin)
2173 goto Ebusy;
2174 if (a->acdirmax != b->acdirmax)
2175 goto Ebusy;
2176 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2177 goto Ebusy;
2178 return 1;
2179 Ebusy:
2180 return 0;
2181 }
2182
2183 struct nfs_sb_mountdata {
2184 struct nfs_server *server;
2185 int mntflags;
2186 };
2187
2188 static int nfs_set_super(struct super_block *s, void *data)
2189 {
2190 struct nfs_sb_mountdata *sb_mntdata = data;
2191 struct nfs_server *server = sb_mntdata->server;
2192 int ret;
2193
2194 s->s_flags = sb_mntdata->mntflags;
2195 s->s_fs_info = server;
2196 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2197 ret = set_anon_super(s, server);
2198 if (ret == 0)
2199 server->s_dev = s->s_dev;
2200 return ret;
2201 }
2202
2203 static int nfs_compare_super_address(struct nfs_server *server1,
2204 struct nfs_server *server2)
2205 {
2206 struct sockaddr *sap1, *sap2;
2207
2208 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2209 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2210
2211 if (sap1->sa_family != sap2->sa_family)
2212 return 0;
2213
2214 switch (sap1->sa_family) {
2215 case AF_INET: {
2216 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2217 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2218 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2219 return 0;
2220 if (sin1->sin_port != sin2->sin_port)
2221 return 0;
2222 break;
2223 }
2224 case AF_INET6: {
2225 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2226 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2227 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2228 return 0;
2229 if (sin1->sin6_port != sin2->sin6_port)
2230 return 0;
2231 break;
2232 }
2233 default:
2234 return 0;
2235 }
2236
2237 return 1;
2238 }
2239
2240 static int nfs_compare_super(struct super_block *sb, void *data)
2241 {
2242 struct nfs_sb_mountdata *sb_mntdata = data;
2243 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2244 int mntflags = sb_mntdata->mntflags;
2245
2246 if (!nfs_compare_super_address(old, server))
2247 return 0;
2248 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2249 if (old->flags & NFS_MOUNT_UNSHARED)
2250 return 0;
2251 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2252 return 0;
2253 return nfs_compare_mount_options(sb, server, mntflags);
2254 }
2255
2256 #ifdef CONFIG_NFS_FSCACHE
2257 static void nfs_get_cache_cookie(struct super_block *sb,
2258 struct nfs_parsed_mount_data *parsed,
2259 struct nfs_clone_mount *cloned)
2260 {
2261 char *uniq = NULL;
2262 int ulen = 0;
2263
2264 if (parsed && parsed->fscache_uniq) {
2265 uniq = parsed->fscache_uniq;
2266 ulen = strlen(parsed->fscache_uniq);
2267 } else if (cloned) {
2268 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2269 if (mnt_s->fscache_key) {
2270 uniq = mnt_s->fscache_key->key.uniquifier;
2271 ulen = mnt_s->fscache_key->key.uniq_len;
2272 };
2273 }
2274
2275 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2276 }
2277 #else
2278 static void nfs_get_cache_cookie(struct super_block *sb,
2279 struct nfs_parsed_mount_data *parsed,
2280 struct nfs_clone_mount *cloned)
2281 {
2282 }
2283 #endif
2284
2285 static int nfs_bdi_register(struct nfs_server *server)
2286 {
2287 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2288 }
2289
2290 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2291 struct nfs_mount_info *mount_info)
2292 {
2293 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2294 }
2295
2296 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2297 struct nfs_mount_info *mount_info)
2298 {
2299 /* clone any lsm security options from the parent to the new sb */
2300 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2301 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2302 return -ESTALE;
2303 return 0;
2304 }
2305
2306 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2307 int flags, const char *dev_name,
2308 struct nfs_mount_info *mount_info,
2309 struct nfs_subversion *nfs_mod)
2310 {
2311 struct super_block *s;
2312 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2313 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2314 struct nfs_sb_mountdata sb_mntdata = {
2315 .mntflags = flags,
2316 .server = server,
2317 };
2318 int error;
2319
2320 if (server->flags & NFS_MOUNT_UNSHARED)
2321 compare_super = NULL;
2322
2323 /* -o noac implies -o sync */
2324 if (server->flags & NFS_MOUNT_NOAC)
2325 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2326
2327 /* Get a superblock - note that we may end up sharing one that already exists */
2328 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2329 if (IS_ERR(s)) {
2330 mntroot = ERR_CAST(s);
2331 goto out_err_nosb;
2332 }
2333
2334 if (s->s_fs_info != server) {
2335 nfs_free_server(server);
2336 server = NULL;
2337 } else {
2338 error = nfs_bdi_register(server);
2339 if (error) {
2340 mntroot = ERR_PTR(error);
2341 goto error_splat_bdi;
2342 }
2343 }
2344
2345 if (!s->s_root) {
2346 /* initial superblock/root creation */
2347 mount_info->fill_super(s, mount_info);
2348 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2349 }
2350
2351 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2352 if (IS_ERR(mntroot))
2353 goto error_splat_super;
2354
2355 error = mount_info->set_security(s, mntroot, mount_info);
2356 if (error)
2357 goto error_splat_root;
2358
2359 s->s_flags |= MS_ACTIVE;
2360
2361 out:
2362 return mntroot;
2363
2364 out_err_nosb:
2365 nfs_free_server(server);
2366 goto out;
2367
2368 error_splat_root:
2369 dput(mntroot);
2370 mntroot = ERR_PTR(error);
2371 error_splat_super:
2372 if (server && !s->s_root)
2373 bdi_unregister(&server->backing_dev_info);
2374 error_splat_bdi:
2375 deactivate_locked_super(s);
2376 goto out;
2377 }
2378
2379 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2380 int flags, const char *dev_name, void *raw_data)
2381 {
2382 struct nfs_mount_info mount_info = {
2383 .fill_super = nfs_fill_super,
2384 .set_security = nfs_set_sb_security,
2385 };
2386 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2387 struct nfs_subversion *nfs_mod;
2388 int error;
2389
2390 mount_info.parsed = nfs_alloc_parsed_mount_data();
2391 mount_info.mntfh = nfs_alloc_fhandle();
2392 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2393 goto out;
2394
2395 /* Validate the mount data */
2396 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2397 if (error == NFS_TEXT_DATA)
2398 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2399 if (error < 0) {
2400 mntroot = ERR_PTR(error);
2401 goto out;
2402 }
2403
2404 nfs_mod = get_nfs_version(mount_info.parsed->version);
2405 if (IS_ERR(nfs_mod)) {
2406 mntroot = ERR_CAST(nfs_mod);
2407 goto out;
2408 }
2409
2410 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2411
2412 put_nfs_version(nfs_mod);
2413 out:
2414 nfs_free_parsed_mount_data(mount_info.parsed);
2415 nfs_free_fhandle(mount_info.mntfh);
2416 return mntroot;
2417 }
2418
2419 /*
2420 * Ensure that we unregister the bdi before kill_anon_super
2421 * releases the device name
2422 */
2423 void nfs_put_super(struct super_block *s)
2424 {
2425 struct nfs_server *server = NFS_SB(s);
2426
2427 bdi_unregister(&server->backing_dev_info);
2428 }
2429
2430 /*
2431 * Destroy an NFS2/3 superblock
2432 */
2433 void nfs_kill_super(struct super_block *s)
2434 {
2435 struct nfs_server *server = NFS_SB(s);
2436
2437 kill_anon_super(s);
2438 nfs_fscache_release_super_cookie(s);
2439 nfs_free_server(server);
2440 }
2441
2442 /*
2443 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2444 */
2445 struct dentry *
2446 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2447 const char *dev_name, void *raw_data)
2448 {
2449 struct nfs_clone_mount *data = raw_data;
2450 struct nfs_mount_info mount_info = {
2451 .fill_super = nfs_clone_super,
2452 .set_security = nfs_clone_sb_security,
2453 .cloned = data,
2454 };
2455 struct nfs_server *server;
2456 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2457 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2458 int error;
2459
2460 dprintk("--> nfs_xdev_mount_common()\n");
2461
2462 mount_info.mntfh = mount_info.cloned->fh;
2463
2464 /* create a new volume representation */
2465 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2466 if (IS_ERR(server)) {
2467 error = PTR_ERR(server);
2468 goto out_err;
2469 }
2470
2471 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
2472 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2473 out:
2474 return mntroot;
2475
2476 out_err:
2477 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2478 goto out;
2479 }
2480
2481 #ifdef CONFIG_NFS_V4
2482
2483 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2484 {
2485 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2486 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2487 }
2488
2489 /*
2490 * Validate NFSv4 mount options
2491 */
2492 static int nfs4_validate_mount_data(void *options,
2493 struct nfs_parsed_mount_data *args,
2494 const char *dev_name)
2495 {
2496 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2497 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2498 char *c;
2499
2500 if (data == NULL)
2501 goto out_no_data;
2502
2503 args->version = 4;
2504
2505 switch (data->version) {
2506 case 1:
2507 if (data->host_addrlen > sizeof(args->nfs_server.address))
2508 goto out_no_address;
2509 if (data->host_addrlen == 0)
2510 goto out_no_address;
2511 args->nfs_server.addrlen = data->host_addrlen;
2512 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2513 return -EFAULT;
2514 if (!nfs_verify_server_address(sap))
2515 goto out_no_address;
2516
2517 if (data->auth_flavourlen) {
2518 if (data->auth_flavourlen > 1)
2519 goto out_inval_auth;
2520 if (copy_from_user(&args->auth_flavors[0],
2521 data->auth_flavours,
2522 sizeof(args->auth_flavors[0])))
2523 return -EFAULT;
2524 }
2525
2526 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2527 if (IS_ERR(c))
2528 return PTR_ERR(c);
2529 args->nfs_server.hostname = c;
2530
2531 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2532 if (IS_ERR(c))
2533 return PTR_ERR(c);
2534 args->nfs_server.export_path = c;
2535 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2536
2537 c = strndup_user(data->client_addr.data, 16);
2538 if (IS_ERR(c))
2539 return PTR_ERR(c);
2540 args->client_address = c;
2541
2542 /*
2543 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2544 * can deal with.
2545 */
2546
2547 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2548 args->rsize = data->rsize;
2549 args->wsize = data->wsize;
2550 args->timeo = data->timeo;
2551 args->retrans = data->retrans;
2552 args->acregmin = data->acregmin;
2553 args->acregmax = data->acregmax;
2554 args->acdirmin = data->acdirmin;
2555 args->acdirmax = data->acdirmax;
2556 args->nfs_server.protocol = data->proto;
2557 nfs_validate_transport_protocol(args);
2558
2559 break;
2560 default:
2561 return NFS_TEXT_DATA;
2562 }
2563
2564 return 0;
2565
2566 out_no_data:
2567 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2568 return -EINVAL;
2569
2570 out_inval_auth:
2571 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2572 data->auth_flavourlen);
2573 return -EINVAL;
2574
2575 out_no_address:
2576 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2577 return -EINVAL;
2578 }
2579
2580 /*
2581 * NFS v4 module parameters need to stay in the
2582 * NFS client for backwards compatibility
2583 */
2584 unsigned int nfs_callback_set_tcpport;
2585 unsigned short nfs_callback_tcpport;
2586 /* Default cache timeout is 10 minutes */
2587 unsigned int nfs_idmap_cache_timeout = 600;
2588 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2589 bool nfs4_disable_idmapping = true;
2590 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2591 unsigned short send_implementation_id = 1;
2592
2593 #define NFS_CALLBACK_MAXPORTNR (65535U)
2594
2595 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2596 {
2597 unsigned long num;
2598 int ret;
2599
2600 if (!val)
2601 return -EINVAL;
2602 ret = strict_strtoul(val, 0, &num);
2603 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2604 return -EINVAL;
2605 *((unsigned int *)kp->arg) = num;
2606 return 0;
2607 }
2608 static struct kernel_param_ops param_ops_portnr = {
2609 .set = param_set_portnr,
2610 .get = param_get_uint,
2611 };
2612 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2613
2614 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2615 module_param(nfs_idmap_cache_timeout, int, 0644);
2616 module_param(nfs4_disable_idmapping, bool, 0644);
2617 MODULE_PARM_DESC(nfs4_disable_idmapping,
2618 "Turn off NFSv4 idmapping when using 'sec=sys'");
2619 module_param(max_session_slots, ushort, 0644);
2620 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2621 "requests the client will negotiate");
2622 module_param(send_implementation_id, ushort, 0644);
2623 MODULE_PARM_DESC(send_implementation_id,
2624 "Send implementation ID with NFSv4.1 exchange_id");
2625 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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