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spi: efm32: Convert to use GPIO descriptors
[linux/fpc-iii.git] / fs / nfs / fs_context.c
blobe1b938457ab9f528d61f44f8d6e83dd45731ce21
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/fs_context.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 * Conversion to new mount api Copyright (C) David Howells
7 *
8 * NFS mount handling.
9 *
10 * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com>
11 */
12
13 #include <linux/module.h>
14 #include <linux/fs.h>
15 #include <linux/fs_context.h>
16 #include <linux/fs_parser.h>
17 #include <linux/nfs_fs.h>
18 #include <linux/nfs_mount.h>
19 #include <linux/nfs4_mount.h>
20 #include "nfs.h"
21 #include "internal.h"
22
23 #define NFSDBG_FACILITY NFSDBG_MOUNT
24
25 #if IS_ENABLED(CONFIG_NFS_V3)
26 #define NFS_DEFAULT_VERSION 3
27 #else
28 #define NFS_DEFAULT_VERSION 2
29 #endif
30
31 #define NFS_MAX_CONNECTIONS 16
32
33 enum nfs_param {
34 Opt_ac,
35 Opt_acdirmax,
36 Opt_acdirmin,
37 Opt_acl,
38 Opt_acregmax,
39 Opt_acregmin,
40 Opt_actimeo,
41 Opt_addr,
42 Opt_bg,
43 Opt_bsize,
44 Opt_clientaddr,
45 Opt_cto,
46 Opt_fg,
47 Opt_fscache,
48 Opt_fscache_flag,
49 Opt_hard,
50 Opt_intr,
51 Opt_local_lock,
52 Opt_lock,
53 Opt_lookupcache,
54 Opt_migration,
55 Opt_minorversion,
56 Opt_mountaddr,
57 Opt_mounthost,
58 Opt_mountport,
59 Opt_mountproto,
60 Opt_mountvers,
61 Opt_namelen,
62 Opt_nconnect,
63 Opt_port,
64 Opt_posix,
65 Opt_proto,
66 Opt_rdirplus,
67 Opt_rdma,
68 Opt_resvport,
69 Opt_retrans,
70 Opt_retry,
71 Opt_rsize,
72 Opt_sec,
73 Opt_sharecache,
74 Opt_sloppy,
75 Opt_soft,
76 Opt_softerr,
77 Opt_softreval,
78 Opt_source,
79 Opt_tcp,
80 Opt_timeo,
81 Opt_udp,
82 Opt_v,
83 Opt_vers,
84 Opt_wsize,
85 };
86
87 enum {
88 Opt_local_lock_all,
89 Opt_local_lock_flock,
90 Opt_local_lock_none,
91 Opt_local_lock_posix,
92 };
93
94 static const struct constant_table nfs_param_enums_local_lock[] = {
95 { "all", Opt_local_lock_all },
96 { "flock", Opt_local_lock_flock },
97 { "none", Opt_local_lock_none },
98 {}
99 };
100
101 enum {
102 Opt_lookupcache_all,
103 Opt_lookupcache_none,
104 Opt_lookupcache_positive,
105 };
106
107 static const struct constant_table nfs_param_enums_lookupcache[] = {
108 { "all", Opt_lookupcache_all },
109 { "none", Opt_lookupcache_none },
110 { "pos", Opt_lookupcache_positive },
111 { "positive", Opt_lookupcache_positive },
112 {}
113 };
114
115 static const struct fs_parameter_spec nfs_fs_parameters[] = {
116 fsparam_flag_no("ac", Opt_ac),
117 fsparam_u32 ("acdirmax", Opt_acdirmax),
118 fsparam_u32 ("acdirmin", Opt_acdirmin),
119 fsparam_flag_no("acl", Opt_acl),
120 fsparam_u32 ("acregmax", Opt_acregmax),
121 fsparam_u32 ("acregmin", Opt_acregmin),
122 fsparam_u32 ("actimeo", Opt_actimeo),
123 fsparam_string("addr", Opt_addr),
124 fsparam_flag ("bg", Opt_bg),
125 fsparam_u32 ("bsize", Opt_bsize),
126 fsparam_string("clientaddr", Opt_clientaddr),
127 fsparam_flag_no("cto", Opt_cto),
128 fsparam_flag ("fg", Opt_fg),
129 fsparam_flag_no("fsc", Opt_fscache_flag),
130 fsparam_string("fsc", Opt_fscache),
131 fsparam_flag ("hard", Opt_hard),
132 __fsparam(NULL, "intr", Opt_intr,
133 fs_param_neg_with_no|fs_param_deprecated, NULL),
134 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock),
135 fsparam_flag_no("lock", Opt_lock),
136 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache),
137 fsparam_flag_no("migration", Opt_migration),
138 fsparam_u32 ("minorversion", Opt_minorversion),
139 fsparam_string("mountaddr", Opt_mountaddr),
140 fsparam_string("mounthost", Opt_mounthost),
141 fsparam_u32 ("mountport", Opt_mountport),
142 fsparam_string("mountproto", Opt_mountproto),
143 fsparam_u32 ("mountvers", Opt_mountvers),
144 fsparam_u32 ("namlen", Opt_namelen),
145 fsparam_u32 ("nconnect", Opt_nconnect),
146 fsparam_string("nfsvers", Opt_vers),
147 fsparam_u32 ("port", Opt_port),
148 fsparam_flag_no("posix", Opt_posix),
149 fsparam_string("proto", Opt_proto),
150 fsparam_flag_no("rdirplus", Opt_rdirplus),
151 fsparam_flag ("rdma", Opt_rdma),
152 fsparam_flag_no("resvport", Opt_resvport),
153 fsparam_u32 ("retrans", Opt_retrans),
154 fsparam_string("retry", Opt_retry),
155 fsparam_u32 ("rsize", Opt_rsize),
156 fsparam_string("sec", Opt_sec),
157 fsparam_flag_no("sharecache", Opt_sharecache),
158 fsparam_flag ("sloppy", Opt_sloppy),
159 fsparam_flag ("soft", Opt_soft),
160 fsparam_flag ("softerr", Opt_softerr),
161 fsparam_flag ("softreval", Opt_softreval),
162 fsparam_string("source", Opt_source),
163 fsparam_flag ("tcp", Opt_tcp),
164 fsparam_u32 ("timeo", Opt_timeo),
165 fsparam_flag ("udp", Opt_udp),
166 fsparam_flag ("v2", Opt_v),
167 fsparam_flag ("v3", Opt_v),
168 fsparam_flag ("v4", Opt_v),
169 fsparam_flag ("v4.0", Opt_v),
170 fsparam_flag ("v4.1", Opt_v),
171 fsparam_flag ("v4.2", Opt_v),
172 fsparam_string("vers", Opt_vers),
173 fsparam_u32 ("wsize", Opt_wsize),
174 {}
175 };
176
177 enum {
178 Opt_vers_2,
179 Opt_vers_3,
180 Opt_vers_4,
181 Opt_vers_4_0,
182 Opt_vers_4_1,
183 Opt_vers_4_2,
184 };
185
186 static const struct constant_table nfs_vers_tokens[] = {
187 { "2", Opt_vers_2 },
188 { "3", Opt_vers_3 },
189 { "4", Opt_vers_4 },
190 { "4.0", Opt_vers_4_0 },
191 { "4.1", Opt_vers_4_1 },
192 { "4.2", Opt_vers_4_2 },
193 };
194
195 enum {
196 Opt_xprt_rdma,
197 Opt_xprt_rdma6,
198 Opt_xprt_tcp,
199 Opt_xprt_tcp6,
200 Opt_xprt_udp,
201 Opt_xprt_udp6,
202 nr__Opt_xprt
203 };
204
205 static const struct constant_table nfs_xprt_protocol_tokens[nr__Opt_xprt] = {
206 { "rdma", Opt_xprt_rdma },
207 { "rdma6", Opt_xprt_rdma6 },
208 { "tcp", Opt_xprt_tcp },
209 { "tcp6", Opt_xprt_tcp6 },
210 { "udp", Opt_xprt_udp },
211 { "udp6", Opt_xprt_udp6 },
212 };
213
214 enum {
215 Opt_sec_krb5,
216 Opt_sec_krb5i,
217 Opt_sec_krb5p,
218 Opt_sec_lkey,
219 Opt_sec_lkeyi,
220 Opt_sec_lkeyp,
221 Opt_sec_none,
222 Opt_sec_spkm,
223 Opt_sec_spkmi,
224 Opt_sec_spkmp,
225 Opt_sec_sys,
226 nr__Opt_sec
227 };
228
229 static const struct constant_table nfs_secflavor_tokens[] = {
230 { "krb5", Opt_sec_krb5 },
231 { "krb5i", Opt_sec_krb5i },
232 { "krb5p", Opt_sec_krb5p },
233 { "lkey", Opt_sec_lkey },
234 { "lkeyi", Opt_sec_lkeyi },
235 { "lkeyp", Opt_sec_lkeyp },
236 { "none", Opt_sec_none },
237 { "null", Opt_sec_none },
238 { "spkm3", Opt_sec_spkm },
239 { "spkm3i", Opt_sec_spkmi },
240 { "spkm3p", Opt_sec_spkmp },
241 { "sys", Opt_sec_sys },
242 };
243
244 /*
245 * Sanity-check a server address provided by the mount command.
246 *
247 * Address family must be initialized, and address must not be
248 * the ANY address for that family.
249 */
250 static int nfs_verify_server_address(struct sockaddr *addr)
251 {
252 switch (addr->sa_family) {
253 case AF_INET: {
254 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
255 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
256 }
257 case AF_INET6: {
258 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
259 return !ipv6_addr_any(sa);
260 }
261 }
262
263 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
264 return 0;
265 }
266
267 /*
268 * Sanity check the NFS transport protocol.
269 *
270 */
271 static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx)
272 {
273 switch (ctx->nfs_server.protocol) {
274 case XPRT_TRANSPORT_UDP:
275 case XPRT_TRANSPORT_TCP:
276 case XPRT_TRANSPORT_RDMA:
277 break;
278 default:
279 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
280 }
281 }
282
283 /*
284 * For text based NFSv2/v3 mounts, the mount protocol transport default
285 * settings should depend upon the specified NFS transport.
286 */
287 static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx)
288 {
289 nfs_validate_transport_protocol(ctx);
290
291 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP ||
292 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP)
293 return;
294 switch (ctx->nfs_server.protocol) {
295 case XPRT_TRANSPORT_UDP:
296 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
297 break;
298 case XPRT_TRANSPORT_TCP:
299 case XPRT_TRANSPORT_RDMA:
300 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
301 }
302 }
303
304 /*
305 * Add 'flavor' to 'auth_info' if not already present.
306 * Returns true if 'flavor' ends up in the list, false otherwise
307 */
308 static int nfs_auth_info_add(struct fs_context *fc,
309 struct nfs_auth_info *auth_info,
310 rpc_authflavor_t flavor)
311 {
312 unsigned int i;
313 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
314
315 /* make sure this flavor isn't already in the list */
316 for (i = 0; i < auth_info->flavor_len; i++) {
317 if (flavor == auth_info->flavors[i])
318 return 0;
319 }
320
321 if (auth_info->flavor_len + 1 >= max_flavor_len)
322 return nfs_invalf(fc, "NFS: too many sec= flavors");
323
324 auth_info->flavors[auth_info->flavor_len++] = flavor;
325 return 0;
326 }
327
328 /*
329 * Parse the value of the 'sec=' option.
330 */
331 static int nfs_parse_security_flavors(struct fs_context *fc,
332 struct fs_parameter *param)
333 {
334 struct nfs_fs_context *ctx = nfs_fc2context(fc);
335 rpc_authflavor_t pseudoflavor;
336 char *string = param->string, *p;
337 int ret;
338
339 dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string);
340
341 while ((p = strsep(&string, ":")) != NULL) {
342 if (!*p)
343 continue;
344 switch (lookup_constant(nfs_secflavor_tokens, p, -1)) {
345 case Opt_sec_none:
346 pseudoflavor = RPC_AUTH_NULL;
347 break;
348 case Opt_sec_sys:
349 pseudoflavor = RPC_AUTH_UNIX;
350 break;
351 case Opt_sec_krb5:
352 pseudoflavor = RPC_AUTH_GSS_KRB5;
353 break;
354 case Opt_sec_krb5i:
355 pseudoflavor = RPC_AUTH_GSS_KRB5I;
356 break;
357 case Opt_sec_krb5p:
358 pseudoflavor = RPC_AUTH_GSS_KRB5P;
359 break;
360 case Opt_sec_lkey:
361 pseudoflavor = RPC_AUTH_GSS_LKEY;
362 break;
363 case Opt_sec_lkeyi:
364 pseudoflavor = RPC_AUTH_GSS_LKEYI;
365 break;
366 case Opt_sec_lkeyp:
367 pseudoflavor = RPC_AUTH_GSS_LKEYP;
368 break;
369 case Opt_sec_spkm:
370 pseudoflavor = RPC_AUTH_GSS_SPKM;
371 break;
372 case Opt_sec_spkmi:
373 pseudoflavor = RPC_AUTH_GSS_SPKMI;
374 break;
375 case Opt_sec_spkmp:
376 pseudoflavor = RPC_AUTH_GSS_SPKMP;
377 break;
378 default:
379 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p);
380 }
381
382 ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor);
383 if (ret < 0)
384 return ret;
385 }
386
387 return 0;
388 }
389
390 static int nfs_parse_version_string(struct fs_context *fc,
391 const char *string)
392 {
393 struct nfs_fs_context *ctx = nfs_fc2context(fc);
394
395 ctx->flags &= ~NFS_MOUNT_VER3;
396 switch (lookup_constant(nfs_vers_tokens, string, -1)) {
397 case Opt_vers_2:
398 ctx->version = 2;
399 break;
400 case Opt_vers_3:
401 ctx->flags |= NFS_MOUNT_VER3;
402 ctx->version = 3;
403 break;
404 case Opt_vers_4:
405 /* Backward compatibility option. In future,
406 * the mount program should always supply
407 * a NFSv4 minor version number.
408 */
409 ctx->version = 4;
410 break;
411 case Opt_vers_4_0:
412 ctx->version = 4;
413 ctx->minorversion = 0;
414 break;
415 case Opt_vers_4_1:
416 ctx->version = 4;
417 ctx->minorversion = 1;
418 break;
419 case Opt_vers_4_2:
420 ctx->version = 4;
421 ctx->minorversion = 2;
422 break;
423 default:
424 return nfs_invalf(fc, "NFS: Unsupported NFS version");
425 }
426 return 0;
427 }
428
429 /*
430 * Parse a single mount parameter.
431 */
432 static int nfs_fs_context_parse_param(struct fs_context *fc,
433 struct fs_parameter *param)
434 {
435 struct fs_parse_result result;
436 struct nfs_fs_context *ctx = nfs_fc2context(fc);
437 unsigned short protofamily, mountfamily;
438 unsigned int len;
439 int ret, opt;
440
441 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key);
442
443 opt = fs_parse(fc, nfs_fs_parameters, param, &result);
444 if (opt < 0)
445 return ctx->sloppy ? 1 : opt;
446
447 switch (opt) {
448 case Opt_source:
449 if (fc->source)
450 return nfs_invalf(fc, "NFS: Multiple sources not supported");
451 fc->source = param->string;
452 param->string = NULL;
453 break;
454
455 /*
456 * boolean options: foo/nofoo
457 */
458 case Opt_soft:
459 ctx->flags |= NFS_MOUNT_SOFT;
460 ctx->flags &= ~NFS_MOUNT_SOFTERR;
461 break;
462 case Opt_softerr:
463 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL;
464 ctx->flags &= ~NFS_MOUNT_SOFT;
465 break;
466 case Opt_hard:
467 ctx->flags &= ~(NFS_MOUNT_SOFT |
468 NFS_MOUNT_SOFTERR |
469 NFS_MOUNT_SOFTREVAL);
470 break;
471 case Opt_softreval:
472 if (result.negated)
473 ctx->flags &= ~NFS_MOUNT_SOFTREVAL;
474 else
475 ctx->flags &= NFS_MOUNT_SOFTREVAL;
476 break;
477 case Opt_posix:
478 if (result.negated)
479 ctx->flags &= ~NFS_MOUNT_POSIX;
480 else
481 ctx->flags |= NFS_MOUNT_POSIX;
482 break;
483 case Opt_cto:
484 if (result.negated)
485 ctx->flags |= NFS_MOUNT_NOCTO;
486 else
487 ctx->flags &= ~NFS_MOUNT_NOCTO;
488 break;
489 case Opt_ac:
490 if (result.negated)
491 ctx->flags |= NFS_MOUNT_NOAC;
492 else
493 ctx->flags &= ~NFS_MOUNT_NOAC;
494 break;
495 case Opt_lock:
496 if (result.negated) {
497 ctx->flags |= NFS_MOUNT_NONLM;
498 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
499 } else {
500 ctx->flags &= ~NFS_MOUNT_NONLM;
501 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL);
502 }
503 break;
504 case Opt_udp:
505 ctx->flags &= ~NFS_MOUNT_TCP;
506 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
507 break;
508 case Opt_tcp:
509 ctx->flags |= NFS_MOUNT_TCP;
510 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
511 break;
512 case Opt_rdma:
513 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */
514 ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
515 xprt_load_transport(param->key);
516 break;
517 case Opt_acl:
518 if (result.negated)
519 ctx->flags |= NFS_MOUNT_NOACL;
520 else
521 ctx->flags &= ~NFS_MOUNT_NOACL;
522 break;
523 case Opt_rdirplus:
524 if (result.negated)
525 ctx->flags |= NFS_MOUNT_NORDIRPLUS;
526 else
527 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS;
528 break;
529 case Opt_sharecache:
530 if (result.negated)
531 ctx->flags |= NFS_MOUNT_UNSHARED;
532 else
533 ctx->flags &= ~NFS_MOUNT_UNSHARED;
534 break;
535 case Opt_resvport:
536 if (result.negated)
537 ctx->flags |= NFS_MOUNT_NORESVPORT;
538 else
539 ctx->flags &= ~NFS_MOUNT_NORESVPORT;
540 break;
541 case Opt_fscache_flag:
542 if (result.negated)
543 ctx->options &= ~NFS_OPTION_FSCACHE;
544 else
545 ctx->options |= NFS_OPTION_FSCACHE;
546 kfree(ctx->fscache_uniq);
547 ctx->fscache_uniq = NULL;
548 break;
549 case Opt_fscache:
550 ctx->options |= NFS_OPTION_FSCACHE;
551 kfree(ctx->fscache_uniq);
552 ctx->fscache_uniq = param->string;
553 param->string = NULL;
554 break;
555 case Opt_migration:
556 if (result.negated)
557 ctx->options &= ~NFS_OPTION_MIGRATION;
558 else
559 ctx->options |= NFS_OPTION_MIGRATION;
560 break;
561
562 /*
563 * options that take numeric values
564 */
565 case Opt_port:
566 if (result.uint_32 > USHRT_MAX)
567 goto out_of_bounds;
568 ctx->nfs_server.port = result.uint_32;
569 break;
570 case Opt_rsize:
571 ctx->rsize = result.uint_32;
572 break;
573 case Opt_wsize:
574 ctx->wsize = result.uint_32;
575 break;
576 case Opt_bsize:
577 ctx->bsize = result.uint_32;
578 break;
579 case Opt_timeo:
580 if (result.uint_32 < 1 || result.uint_32 > INT_MAX)
581 goto out_of_bounds;
582 ctx->timeo = result.uint_32;
583 break;
584 case Opt_retrans:
585 if (result.uint_32 > INT_MAX)
586 goto out_of_bounds;
587 ctx->retrans = result.uint_32;
588 break;
589 case Opt_acregmin:
590 ctx->acregmin = result.uint_32;
591 break;
592 case Opt_acregmax:
593 ctx->acregmax = result.uint_32;
594 break;
595 case Opt_acdirmin:
596 ctx->acdirmin = result.uint_32;
597 break;
598 case Opt_acdirmax:
599 ctx->acdirmax = result.uint_32;
600 break;
601 case Opt_actimeo:
602 ctx->acregmin = result.uint_32;
603 ctx->acregmax = result.uint_32;
604 ctx->acdirmin = result.uint_32;
605 ctx->acdirmax = result.uint_32;
606 break;
607 case Opt_namelen:
608 ctx->namlen = result.uint_32;
609 break;
610 case Opt_mountport:
611 if (result.uint_32 > USHRT_MAX)
612 goto out_of_bounds;
613 ctx->mount_server.port = result.uint_32;
614 break;
615 case Opt_mountvers:
616 if (result.uint_32 < NFS_MNT_VERSION ||
617 result.uint_32 > NFS_MNT3_VERSION)
618 goto out_of_bounds;
619 ctx->mount_server.version = result.uint_32;
620 break;
621 case Opt_minorversion:
622 if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
623 goto out_of_bounds;
624 ctx->minorversion = result.uint_32;
625 break;
626
627 /*
628 * options that take text values
629 */
630 case Opt_v:
631 ret = nfs_parse_version_string(fc, param->key + 1);
632 if (ret < 0)
633 return ret;
634 break;
635 case Opt_vers:
636 ret = nfs_parse_version_string(fc, param->string);
637 if (ret < 0)
638 return ret;
639 break;
640 case Opt_sec:
641 ret = nfs_parse_security_flavors(fc, param);
642 if (ret < 0)
643 return ret;
644 break;
645
646 case Opt_proto:
647 protofamily = AF_INET;
648 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
649 case Opt_xprt_udp6:
650 protofamily = AF_INET6;
651 /* fall through */
652 case Opt_xprt_udp:
653 ctx->flags &= ~NFS_MOUNT_TCP;
654 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
655 break;
656 case Opt_xprt_tcp6:
657 protofamily = AF_INET6;
658 /* fall through */
659 case Opt_xprt_tcp:
660 ctx->flags |= NFS_MOUNT_TCP;
661 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
662 break;
663 case Opt_xprt_rdma6:
664 protofamily = AF_INET6;
665 /* fall through */
666 case Opt_xprt_rdma:
667 /* vector side protocols to TCP */
668 ctx->flags |= NFS_MOUNT_TCP;
669 ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
670 xprt_load_transport(param->string);
671 break;
672 default:
673 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
674 }
675
676 ctx->protofamily = protofamily;
677 break;
678
679 case Opt_mountproto:
680 mountfamily = AF_INET;
681 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) {
682 case Opt_xprt_udp6:
683 mountfamily = AF_INET6;
684 /* fall through */
685 case Opt_xprt_udp:
686 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
687 break;
688 case Opt_xprt_tcp6:
689 mountfamily = AF_INET6;
690 /* fall through */
691 case Opt_xprt_tcp:
692 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
693 break;
694 case Opt_xprt_rdma: /* not used for side protocols */
695 default:
696 return nfs_invalf(fc, "NFS: Unrecognized transport protocol");
697 }
698 ctx->mountfamily = mountfamily;
699 break;
700
701 case Opt_addr:
702 len = rpc_pton(fc->net_ns, param->string, param->size,
703 &ctx->nfs_server.address,
704 sizeof(ctx->nfs_server._address));
705 if (len == 0)
706 goto out_invalid_address;
707 ctx->nfs_server.addrlen = len;
708 break;
709 case Opt_clientaddr:
710 kfree(ctx->client_address);
711 ctx->client_address = param->string;
712 param->string = NULL;
713 break;
714 case Opt_mounthost:
715 kfree(ctx->mount_server.hostname);
716 ctx->mount_server.hostname = param->string;
717 param->string = NULL;
718 break;
719 case Opt_mountaddr:
720 len = rpc_pton(fc->net_ns, param->string, param->size,
721 &ctx->mount_server.address,
722 sizeof(ctx->mount_server._address));
723 if (len == 0)
724 goto out_invalid_address;
725 ctx->mount_server.addrlen = len;
726 break;
727 case Opt_nconnect:
728 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS)
729 goto out_of_bounds;
730 ctx->nfs_server.nconnect = result.uint_32;
731 break;
732 case Opt_lookupcache:
733 switch (result.uint_32) {
734 case Opt_lookupcache_all:
735 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
736 break;
737 case Opt_lookupcache_positive:
738 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
739 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
740 break;
741 case Opt_lookupcache_none:
742 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
743 break;
744 default:
745 goto out_invalid_value;
746 }
747 break;
748 case Opt_local_lock:
749 switch (result.uint_32) {
750 case Opt_local_lock_all:
751 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK |
752 NFS_MOUNT_LOCAL_FCNTL);
753 break;
754 case Opt_local_lock_flock:
755 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK;
756 break;
757 case Opt_local_lock_posix:
758 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL;
759 break;
760 case Opt_local_lock_none:
761 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
762 NFS_MOUNT_LOCAL_FCNTL);
763 break;
764 default:
765 goto out_invalid_value;
766 }
767 break;
768
769 /*
770 * Special options
771 */
772 case Opt_sloppy:
773 ctx->sloppy = true;
774 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
775 break;
776 }
777
778 return 0;
779
780 out_invalid_value:
781 return nfs_invalf(fc, "NFS: Bad mount option value specified");
782 out_invalid_address:
783 return nfs_invalf(fc, "NFS: Bad IP address specified");
784 out_of_bounds:
785 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key);
786 }
787
788 /*
789 * Split fc->source into "hostname:export_path".
790 *
791 * The leftmost colon demarks the split between the server's hostname
792 * and the export path. If the hostname starts with a left square
793 * bracket, then it may contain colons.
794 *
795 * Note: caller frees hostname and export path, even on error.
796 */
797 static int nfs_parse_source(struct fs_context *fc,
798 size_t maxnamlen, size_t maxpathlen)
799 {
800 struct nfs_fs_context *ctx = nfs_fc2context(fc);
801 const char *dev_name = fc->source;
802 size_t len;
803 const char *end;
804
805 if (unlikely(!dev_name || !*dev_name)) {
806 dfprintk(MOUNT, "NFS: device name not specified\n");
807 return -EINVAL;
808 }
809
810 /* Is the host name protected with square brakcets? */
811 if (*dev_name == '[') {
812 end = strchr(++dev_name, ']');
813 if (end == NULL || end[1] != ':')
814 goto out_bad_devname;
815
816 len = end - dev_name;
817 end++;
818 } else {
819 const char *comma;
820
821 end = strchr(dev_name, ':');
822 if (end == NULL)
823 goto out_bad_devname;
824 len = end - dev_name;
825
826 /* kill possible hostname list: not supported */
827 comma = memchr(dev_name, ',', len);
828 if (comma)
829 len = comma - dev_name;
830 }
831
832 if (len > maxnamlen)
833 goto out_hostname;
834
835 /* N.B. caller will free nfs_server.hostname in all cases */
836 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL);
837 if (!ctx->nfs_server.hostname)
838 goto out_nomem;
839 len = strlen(++end);
840 if (len > maxpathlen)
841 goto out_path;
842 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL);
843 if (!ctx->nfs_server.export_path)
844 goto out_nomem;
845
846 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path);
847 return 0;
848
849 out_bad_devname:
850 return nfs_invalf(fc, "NFS: device name not in host:path format");
851 out_nomem:
852 nfs_errorf(fc, "NFS: not enough memory to parse device name");
853 return -ENOMEM;
854 out_hostname:
855 nfs_errorf(fc, "NFS: server hostname too long");
856 return -ENAMETOOLONG;
857 out_path:
858 nfs_errorf(fc, "NFS: export pathname too long");
859 return -ENAMETOOLONG;
860 }
861
862 static inline bool is_remount_fc(struct fs_context *fc)
863 {
864 return fc->root != NULL;
865 }
866
867 /*
868 * Parse monolithic NFS2/NFS3 mount data
869 * - fills in the mount root filehandle
870 *
871 * For option strings, user space handles the following behaviors:
872 *
873 * + DNS: mapping server host name to IP address ("addr=" option)
874 *
875 * + failure mode: how to behave if a mount request can't be handled
876 * immediately ("fg/bg" option)
877 *
878 * + retry: how often to retry a mount request ("retry=" option)
879 *
880 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
881 * mountproto=tcp after mountproto=udp, and so on
882 */
883 static int nfs23_parse_monolithic(struct fs_context *fc,
884 struct nfs_mount_data *data)
885 {
886 struct nfs_fs_context *ctx = nfs_fc2context(fc);
887 struct nfs_fh *mntfh = ctx->mntfh;
888 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
889 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
890
891 if (data == NULL)
892 goto out_no_data;
893
894 ctx->version = NFS_DEFAULT_VERSION;
895 switch (data->version) {
896 case 1:
897 data->namlen = 0; /* fall through */
898 case 2:
899 data->bsize = 0; /* fall through */
900 case 3:
901 if (data->flags & NFS_MOUNT_VER3)
902 goto out_no_v3;
903 data->root.size = NFS2_FHSIZE;
904 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
905 /* Turn off security negotiation */
906 extra_flags |= NFS_MOUNT_SECFLAVOUR;
907 /* fall through */
908 case 4:
909 if (data->flags & NFS_MOUNT_SECFLAVOUR)
910 goto out_no_sec;
911 /* fall through */
912 case 5:
913 memset(data->context, 0, sizeof(data->context));
914 /* fall through */
915 case 6:
916 if (data->flags & NFS_MOUNT_VER3) {
917 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
918 goto out_invalid_fh;
919 mntfh->size = data->root.size;
920 ctx->version = 3;
921 } else {
922 mntfh->size = NFS2_FHSIZE;
923 ctx->version = 2;
924 }
925
926
927 memcpy(mntfh->data, data->root.data, mntfh->size);
928 if (mntfh->size < sizeof(mntfh->data))
929 memset(mntfh->data + mntfh->size, 0,
930 sizeof(mntfh->data) - mntfh->size);
931
932 /*
933 * Translate to nfs_fs_context, which nfs_fill_super
934 * can deal with.
935 */
936 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK;
937 ctx->flags |= extra_flags;
938 ctx->rsize = data->rsize;
939 ctx->wsize = data->wsize;
940 ctx->timeo = data->timeo;
941 ctx->retrans = data->retrans;
942 ctx->acregmin = data->acregmin;
943 ctx->acregmax = data->acregmax;
944 ctx->acdirmin = data->acdirmin;
945 ctx->acdirmax = data->acdirmax;
946 ctx->need_mount = false;
947
948 memcpy(sap, &data->addr, sizeof(data->addr));
949 ctx->nfs_server.addrlen = sizeof(data->addr);
950 ctx->nfs_server.port = ntohs(data->addr.sin_port);
951 if (sap->sa_family != AF_INET ||
952 !nfs_verify_server_address(sap))
953 goto out_no_address;
954
955 if (!(data->flags & NFS_MOUNT_TCP))
956 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
957 /* N.B. caller will free nfs_server.hostname in all cases */
958 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
959 if (!ctx->nfs_server.hostname)
960 goto out_nomem;
961
962 ctx->namlen = data->namlen;
963 ctx->bsize = data->bsize;
964
965 if (data->flags & NFS_MOUNT_SECFLAVOUR)
966 ctx->selected_flavor = data->pseudoflavor;
967 else
968 ctx->selected_flavor = RPC_AUTH_UNIX;
969
970 if (!(data->flags & NFS_MOUNT_NONLM))
971 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
972 NFS_MOUNT_LOCAL_FCNTL);
973 else
974 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK|
975 NFS_MOUNT_LOCAL_FCNTL);
976
977 /*
978 * The legacy version 6 binary mount data from userspace has a
979 * field used only to transport selinux information into the
980 * the kernel. To continue to support that functionality we
981 * have a touch of selinux knowledge here in the NFS code. The
982 * userspace code converted context=blah to just blah so we are
983 * converting back to the full string selinux understands.
984 */
985 if (data->context[0]){
986 #ifdef CONFIG_SECURITY_SELINUX
987 int ret;
988
989 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
990 ret = vfs_parse_fs_string(fc, "context",
991 data->context, strlen(data->context));
992 if (ret < 0)
993 return ret;
994 #else
995 return -EINVAL;
996 #endif
997 }
998
999 break;
1000 default:
1001 goto generic;
1002 }
1003
1004 ctx->skip_reconfig_option_check = true;
1005 return 0;
1006
1007 generic:
1008 return generic_parse_monolithic(fc, data);
1009
1010 out_no_data:
1011 if (is_remount_fc(fc)) {
1012 ctx->skip_reconfig_option_check = true;
1013 return 0;
1014 }
1015 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data");
1016
1017 out_no_v3:
1018 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3");
1019
1020 out_no_sec:
1021 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS");
1022
1023 out_nomem:
1024 dfprintk(MOUNT, "NFS: not enough memory to handle mount options");
1025 return -ENOMEM;
1026
1027 out_no_address:
1028 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1029
1030 out_invalid_fh:
1031 return nfs_invalf(fc, "NFS: invalid root filehandle");
1032 }
1033
1034 #if IS_ENABLED(CONFIG_NFS_V4)
1035 /*
1036 * Validate NFSv4 mount options
1037 */
1038 static int nfs4_parse_monolithic(struct fs_context *fc,
1039 struct nfs4_mount_data *data)
1040 {
1041 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1042 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1043 char *c;
1044
1045 if (data == NULL)
1046 goto out_no_data;
1047
1048 ctx->version = 4;
1049
1050 switch (data->version) {
1051 case 1:
1052 if (data->host_addrlen > sizeof(ctx->nfs_server.address))
1053 goto out_no_address;
1054 if (data->host_addrlen == 0)
1055 goto out_no_address;
1056 ctx->nfs_server.addrlen = data->host_addrlen;
1057 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
1058 return -EFAULT;
1059 if (!nfs_verify_server_address(sap))
1060 goto out_no_address;
1061 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
1062
1063 if (data->auth_flavourlen) {
1064 rpc_authflavor_t pseudoflavor;
1065 if (data->auth_flavourlen > 1)
1066 goto out_inval_auth;
1067 if (copy_from_user(&pseudoflavor,
1068 data->auth_flavours,
1069 sizeof(pseudoflavor)))
1070 return -EFAULT;
1071 ctx->selected_flavor = pseudoflavor;
1072 } else
1073 ctx->selected_flavor = RPC_AUTH_UNIX;
1074
1075 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1076 if (IS_ERR(c))
1077 return PTR_ERR(c);
1078 ctx->nfs_server.hostname = c;
1079
1080 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1081 if (IS_ERR(c))
1082 return PTR_ERR(c);
1083 ctx->nfs_server.export_path = c;
1084 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1085
1086 c = strndup_user(data->client_addr.data, 16);
1087 if (IS_ERR(c))
1088 return PTR_ERR(c);
1089 ctx->client_address = c;
1090
1091 /*
1092 * Translate to nfs_fs_context, which nfs_fill_super
1093 * can deal with.
1094 */
1095
1096 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1097 ctx->rsize = data->rsize;
1098 ctx->wsize = data->wsize;
1099 ctx->timeo = data->timeo;
1100 ctx->retrans = data->retrans;
1101 ctx->acregmin = data->acregmin;
1102 ctx->acregmax = data->acregmax;
1103 ctx->acdirmin = data->acdirmin;
1104 ctx->acdirmax = data->acdirmax;
1105 ctx->nfs_server.protocol = data->proto;
1106 nfs_validate_transport_protocol(ctx);
1107 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1108 goto out_invalid_transport_udp;
1109
1110 break;
1111 default:
1112 goto generic;
1113 }
1114
1115 ctx->skip_reconfig_option_check = true;
1116 return 0;
1117
1118 generic:
1119 return generic_parse_monolithic(fc, data);
1120
1121 out_no_data:
1122 if (is_remount_fc(fc)) {
1123 ctx->skip_reconfig_option_check = true;
1124 return 0;
1125 }
1126 return nfs_invalf(fc, "NFS4: mount program didn't pass any mount data");
1127
1128 out_inval_auth:
1129 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d",
1130 data->auth_flavourlen);
1131
1132 out_no_address:
1133 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address");
1134
1135 out_invalid_transport_udp:
1136 return nfs_invalf(fc, "NFSv4: Unsupported transport protocol udp");
1137 }
1138 #endif
1139
1140 /*
1141 * Parse a monolithic block of data from sys_mount().
1142 */
1143 static int nfs_fs_context_parse_monolithic(struct fs_context *fc,
1144 void *data)
1145 {
1146 if (fc->fs_type == &nfs_fs_type)
1147 return nfs23_parse_monolithic(fc, data);
1148
1149 #if IS_ENABLED(CONFIG_NFS_V4)
1150 if (fc->fs_type == &nfs4_fs_type)
1151 return nfs4_parse_monolithic(fc, data);
1152 #endif
1153
1154 return nfs_invalf(fc, "NFS: Unsupported monolithic data version");
1155 }
1156
1157 /*
1158 * Validate the preparsed information in the config.
1159 */
1160 static int nfs_fs_context_validate(struct fs_context *fc)
1161 {
1162 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1163 struct nfs_subversion *nfs_mod;
1164 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address;
1165 int max_namelen = PAGE_SIZE;
1166 int max_pathlen = NFS_MAXPATHLEN;
1167 int port = 0;
1168 int ret;
1169
1170 if (!fc->source)
1171 goto out_no_device_name;
1172
1173 /* Check for sanity first. */
1174 if (ctx->minorversion && ctx->version != 4)
1175 goto out_minorversion_mismatch;
1176
1177 if (ctx->options & NFS_OPTION_MIGRATION &&
1178 (ctx->version != 4 || ctx->minorversion != 0))
1179 goto out_migration_misuse;
1180
1181 /* Verify that any proto=/mountproto= options match the address
1182 * families in the addr=/mountaddr= options.
1183 */
1184 if (ctx->protofamily != AF_UNSPEC &&
1185 ctx->protofamily != ctx->nfs_server.address.sa_family)
1186 goto out_proto_mismatch;
1187
1188 if (ctx->mountfamily != AF_UNSPEC) {
1189 if (ctx->mount_server.addrlen) {
1190 if (ctx->mountfamily != ctx->mount_server.address.sa_family)
1191 goto out_mountproto_mismatch;
1192 } else {
1193 if (ctx->mountfamily != ctx->nfs_server.address.sa_family)
1194 goto out_mountproto_mismatch;
1195 }
1196 }
1197
1198 if (!nfs_verify_server_address(sap))
1199 goto out_no_address;
1200
1201 if (ctx->version == 4) {
1202 if (IS_ENABLED(CONFIG_NFS_V4)) {
1203 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1204 port = NFS_RDMA_PORT;
1205 else
1206 port = NFS_PORT;
1207 max_namelen = NFS4_MAXNAMLEN;
1208 max_pathlen = NFS4_MAXPATHLEN;
1209 nfs_validate_transport_protocol(ctx);
1210 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1211 goto out_invalid_transport_udp;
1212 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL |
1213 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK |
1214 NFS_MOUNT_LOCAL_FCNTL);
1215 } else {
1216 goto out_v4_not_compiled;
1217 }
1218 } else {
1219 nfs_set_mount_transport_protocol(ctx);
1220 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT
1221 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP)
1222 goto out_invalid_transport_udp;
1223 #endif
1224 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA)
1225 port = NFS_RDMA_PORT;
1226 }
1227
1228 nfs_set_port(sap, &ctx->nfs_server.port, port);
1229
1230 ret = nfs_parse_source(fc, max_namelen, max_pathlen);
1231 if (ret < 0)
1232 return ret;
1233
1234 /* Load the NFS protocol module if we haven't done so yet */
1235 if (!ctx->nfs_mod) {
1236 nfs_mod = get_nfs_version(ctx->version);
1237 if (IS_ERR(nfs_mod)) {
1238 ret = PTR_ERR(nfs_mod);
1239 goto out_version_unavailable;
1240 }
1241 ctx->nfs_mod = nfs_mod;
1242 }
1243 return 0;
1244
1245 out_no_device_name:
1246 return nfs_invalf(fc, "NFS: Device name not specified");
1247 out_v4_not_compiled:
1248 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel");
1249 return -EPROTONOSUPPORT;
1250 out_invalid_transport_udp:
1251 return nfs_invalf(fc, "NFSv4: Unsupported transport protocol udp");
1252 out_no_address:
1253 return nfs_invalf(fc, "NFS: mount program didn't pass remote address");
1254 out_mountproto_mismatch:
1255 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option");
1256 out_proto_mismatch:
1257 return nfs_invalf(fc, "NFS: Server address does not match proto= option");
1258 out_minorversion_mismatch:
1259 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u",
1260 ctx->version, ctx->minorversion);
1261 out_migration_misuse:
1262 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version");
1263 out_version_unavailable:
1264 nfs_errorf(fc, "NFS: Version unavailable");
1265 return ret;
1266 }
1267
1268 /*
1269 * Create an NFS superblock by the appropriate method.
1270 */
1271 static int nfs_get_tree(struct fs_context *fc)
1272 {
1273 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1274 int err = nfs_fs_context_validate(fc);
1275
1276 if (err)
1277 return err;
1278 if (!ctx->internal)
1279 return ctx->nfs_mod->rpc_ops->try_get_tree(fc);
1280 else
1281 return nfs_get_tree_common(fc);
1282 }
1283
1284 /*
1285 * Handle duplication of a configuration. The caller copied *src into *sc, but
1286 * it can't deal with resource pointers in the filesystem context, so we have
1287 * to do that. We need to clear pointers, copy data or get extra refs as
1288 * appropriate.
1289 */
1290 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
1291 {
1292 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx;
1293
1294 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL);
1295 if (!ctx)
1296 return -ENOMEM;
1297
1298 ctx->mntfh = nfs_alloc_fhandle();
1299 if (!ctx->mntfh) {
1300 kfree(ctx);
1301 return -ENOMEM;
1302 }
1303 nfs_copy_fh(ctx->mntfh, src->mntfh);
1304
1305 __module_get(ctx->nfs_mod->owner);
1306 ctx->client_address = NULL;
1307 ctx->mount_server.hostname = NULL;
1308 ctx->nfs_server.export_path = NULL;
1309 ctx->nfs_server.hostname = NULL;
1310 ctx->fscache_uniq = NULL;
1311 ctx->clone_data.fattr = NULL;
1312 fc->fs_private = ctx;
1313 return 0;
1314 }
1315
1316 static void nfs_fs_context_free(struct fs_context *fc)
1317 {
1318 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1319
1320 if (ctx) {
1321 if (ctx->server)
1322 nfs_free_server(ctx->server);
1323 if (ctx->nfs_mod)
1324 put_nfs_version(ctx->nfs_mod);
1325 kfree(ctx->client_address);
1326 kfree(ctx->mount_server.hostname);
1327 kfree(ctx->nfs_server.export_path);
1328 kfree(ctx->nfs_server.hostname);
1329 kfree(ctx->fscache_uniq);
1330 nfs_free_fhandle(ctx->mntfh);
1331 nfs_free_fattr(ctx->clone_data.fattr);
1332 kfree(ctx);
1333 }
1334 }
1335
1336 static const struct fs_context_operations nfs_fs_context_ops = {
1337 .free = nfs_fs_context_free,
1338 .dup = nfs_fs_context_dup,
1339 .parse_param = nfs_fs_context_parse_param,
1340 .parse_monolithic = nfs_fs_context_parse_monolithic,
1341 .get_tree = nfs_get_tree,
1342 .reconfigure = nfs_reconfigure,
1343 };
1344
1345 /*
1346 * Prepare superblock configuration. We use the namespaces attached to the
1347 * context. This may be the current process's namespaces, or it may be a
1348 * container's namespaces.
1349 */
1350 static int nfs_init_fs_context(struct fs_context *fc)
1351 {
1352 struct nfs_fs_context *ctx;
1353
1354 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL);
1355 if (unlikely(!ctx))
1356 return -ENOMEM;
1357
1358 ctx->mntfh = nfs_alloc_fhandle();
1359 if (unlikely(!ctx->mntfh)) {
1360 kfree(ctx);
1361 return -ENOMEM;
1362 }
1363
1364 ctx->protofamily = AF_UNSPEC;
1365 ctx->mountfamily = AF_UNSPEC;
1366 ctx->mount_server.port = NFS_UNSPEC_PORT;
1367
1368 if (fc->root) {
1369 /* reconfigure, start with the current config */
1370 struct nfs_server *nfss = fc->root->d_sb->s_fs_info;
1371 struct net *net = nfss->nfs_client->cl_net;
1372
1373 ctx->flags = nfss->flags;
1374 ctx->rsize = nfss->rsize;
1375 ctx->wsize = nfss->wsize;
1376 ctx->retrans = nfss->client->cl_timeout->to_retries;
1377 ctx->selected_flavor = nfss->client->cl_auth->au_flavor;
1378 ctx->acregmin = nfss->acregmin / HZ;
1379 ctx->acregmax = nfss->acregmax / HZ;
1380 ctx->acdirmin = nfss->acdirmin / HZ;
1381 ctx->acdirmax = nfss->acdirmax / HZ;
1382 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1383 ctx->nfs_server.port = nfss->port;
1384 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1385 ctx->version = nfss->nfs_client->rpc_ops->version;
1386 ctx->minorversion = nfss->nfs_client->cl_minorversion;
1387
1388 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr,
1389 ctx->nfs_server.addrlen);
1390
1391 if (fc->net_ns != net) {
1392 put_net(fc->net_ns);
1393 fc->net_ns = get_net(net);
1394 }
1395
1396 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod;
1397 __module_get(ctx->nfs_mod->owner);
1398 } else {
1399 /* defaults */
1400 ctx->timeo = NFS_UNSPEC_TIMEO;
1401 ctx->retrans = NFS_UNSPEC_RETRANS;
1402 ctx->acregmin = NFS_DEF_ACREGMIN;
1403 ctx->acregmax = NFS_DEF_ACREGMAX;
1404 ctx->acdirmin = NFS_DEF_ACDIRMIN;
1405 ctx->acdirmax = NFS_DEF_ACDIRMAX;
1406 ctx->nfs_server.port = NFS_UNSPEC_PORT;
1407 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1408 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR;
1409 ctx->minorversion = 0;
1410 ctx->need_mount = true;
1411 }
1412 fc->fs_private = ctx;
1413 fc->ops = &nfs_fs_context_ops;
1414 return 0;
1415 }
1416
1417 struct file_system_type nfs_fs_type = {
1418 .owner = THIS_MODULE,
1419 .name = "nfs",
1420 .init_fs_context = nfs_init_fs_context,
1421 .parameters = nfs_fs_parameters,
1422 .kill_sb = nfs_kill_super,
1423 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1424 };
1425 MODULE_ALIAS_FS("nfs");
1426 EXPORT_SYMBOL_GPL(nfs_fs_type);
1427
1428 #if IS_ENABLED(CONFIG_NFS_V4)
1429 struct file_system_type nfs4_fs_type = {
1430 .owner = THIS_MODULE,
1431 .name = "nfs4",
1432 .init_fs_context = nfs_init_fs_context,
1433 .parameters = nfs_fs_parameters,
1434 .kill_sb = nfs_kill_super,
1435 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
1436 };
1437 MODULE_ALIAS_FS("nfs4");
1438 MODULE_ALIAS("nfs4");
1439 EXPORT_SYMBOL_GPL(nfs4_fs_type);
1440 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support