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Merge tag 'gpio-for-v3.11-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / fs / nfs / super.c
blob71fdc0dfa0d28d9e293cbb58729d63395af7cc99
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/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
58
59 #include <asm/uaccess.h>
60
61 #include "nfs4_fs.h"
62 #include "callback.h"
63 #include "delegation.h"
64 #include "iostat.h"
65 #include "internal.h"
66 #include "fscache.h"
67 #include "nfs4session.h"
68 #include "pnfs.h"
69 #include "nfs.h"
70
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
73
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
76 #else
77 #define NFS_DEFAULT_VERSION 2
78 #endif
79
80 enum {
81 /* Mount options that take no arguments */
82 Opt_soft, Opt_hard,
83 Opt_posix, Opt_noposix,
84 Opt_cto, Opt_nocto,
85 Opt_ac, Opt_noac,
86 Opt_lock, Opt_nolock,
87 Opt_udp, Opt_tcp, Opt_rdma,
88 Opt_acl, Opt_noacl,
89 Opt_rdirplus, Opt_nordirplus,
90 Opt_sharecache, Opt_nosharecache,
91 Opt_resvport, Opt_noresvport,
92 Opt_fscache, Opt_nofscache,
93 Opt_migration, Opt_nomigration,
94
95 /* Mount options that take integer arguments */
96 Opt_port,
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
101 Opt_actimeo,
102 Opt_namelen,
103 Opt_mountport,
104 Opt_mountvers,
105 Opt_minorversion,
106
107 /* Mount options that take string arguments */
108 Opt_nfsvers,
109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
111 Opt_lookupcache,
112 Opt_fscache_uniq,
113 Opt_local_lock,
114
115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
117
118 Opt_err
119 };
120
121 static const match_table_t nfs_mount_option_tokens = {
122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
124 { Opt_userspace, "retry=%s" },
125
126 { Opt_sloppy, "sloppy" },
127
128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
134 { Opt_cto, "cto" },
135 { Opt_nocto, "nocto" },
136 { Opt_ac, "ac" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
140 { Opt_udp, "udp" },
141 { Opt_tcp, "tcp" },
142 { Opt_rdma, "rdma" },
143 { Opt_acl, "acl" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
151 { Opt_fscache, "fsc" },
152 { Opt_nofscache, "nofsc" },
153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
155
156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
170 { Opt_minorversion, "minorversion=%s" },
171
172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
174
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
180 { Opt_mounthost, "mounthost=%s" },
181 { Opt_mountaddr, "mountaddr=%s" },
182
183 { Opt_lookupcache, "lookupcache=%s" },
184 { Opt_fscache_uniq, "fsc=%s" },
185 { Opt_local_lock, "local_lock=%s" },
186
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
189
190 { Opt_err, NULL }
191 };
192
193 enum {
194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
195
196 Opt_xprt_err
197 };
198
199 static const match_table_t nfs_xprt_protocol_tokens = {
200 { Opt_xprt_udp, "udp" },
201 { Opt_xprt_udp6, "udp6" },
202 { Opt_xprt_tcp, "tcp" },
203 { Opt_xprt_tcp6, "tcp6" },
204 { Opt_xprt_rdma, "rdma" },
205
206 { Opt_xprt_err, NULL }
207 };
208
209 enum {
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214
215 Opt_sec_err
216 };
217
218 static const match_table_t nfs_secflavor_tokens = {
219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
222
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
226
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
230
231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
234
235 { Opt_sec_err, NULL }
236 };
237
238 enum {
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
241
242 Opt_lookupcache_err
243 };
244
245 static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
250
251 { Opt_lookupcache_err, NULL }
252 };
253
254 enum {
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256 Opt_local_lock_none,
257
258 Opt_local_lock_err
259 };
260
261 static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
266
267 { Opt_local_lock_err, NULL }
268 };
269
270 enum {
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1, Opt_vers_4_2,
273
274 Opt_vers_err
275 };
276
277 static match_table_t nfs_vers_tokens = {
278 { Opt_vers_2, "2" },
279 { Opt_vers_3, "3" },
280 { Opt_vers_4, "4" },
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283 { Opt_vers_4_2, "4.2" },
284
285 { Opt_vers_err, NULL }
286 };
287
288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
290
291 struct file_system_type nfs_fs_type = {
292 .owner = THIS_MODULE,
293 .name = "nfs",
294 .mount = nfs_fs_mount,
295 .kill_sb = nfs_kill_super,
296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
297 };
298 MODULE_ALIAS_FS("nfs");
299 EXPORT_SYMBOL_GPL(nfs_fs_type);
300
301 struct file_system_type nfs_xdev_fs_type = {
302 .owner = THIS_MODULE,
303 .name = "nfs",
304 .mount = nfs_xdev_mount,
305 .kill_sb = nfs_kill_super,
306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
307 };
308
309 const struct super_operations nfs_sops = {
310 .alloc_inode = nfs_alloc_inode,
311 .destroy_inode = nfs_destroy_inode,
312 .write_inode = nfs_write_inode,
313 .drop_inode = nfs_drop_inode,
314 .put_super = nfs_put_super,
315 .statfs = nfs_statfs,
316 .evict_inode = nfs_evict_inode,
317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
321 .show_stats = nfs_show_stats,
322 .remount_fs = nfs_remount,
323 };
324 EXPORT_SYMBOL_GPL(nfs_sops);
325
326 #if IS_ENABLED(CONFIG_NFS_V4)
327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
328 static int nfs4_validate_mount_data(void *options,
329 struct nfs_parsed_mount_data *args, const char *dev_name);
330
331 struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
337 };
338 MODULE_ALIAS_FS("nfs4");
339 MODULE_ALIAS("nfs4");
340 EXPORT_SYMBOL_GPL(nfs4_fs_type);
341
342 static int __init register_nfs4_fs(void)
343 {
344 return register_filesystem(&nfs4_fs_type);
345 }
346
347 static void unregister_nfs4_fs(void)
348 {
349 unregister_filesystem(&nfs4_fs_type);
350 }
351 #else
352 static int __init register_nfs4_fs(void)
353 {
354 return 0;
355 }
356
357 static void unregister_nfs4_fs(void)
358 {
359 }
360 #endif
361
362 static struct shrinker acl_shrinker = {
363 .shrink = nfs_access_cache_shrinker,
364 .seeks = DEFAULT_SEEKS,
365 };
366
367 /*
368 * Register the NFS filesystems
369 */
370 int __init register_nfs_fs(void)
371 {
372 int ret;
373
374 ret = register_filesystem(&nfs_fs_type);
375 if (ret < 0)
376 goto error_0;
377
378 ret = register_nfs4_fs();
379 if (ret < 0)
380 goto error_1;
381
382 ret = nfs_register_sysctl();
383 if (ret < 0)
384 goto error_2;
385 register_shrinker(&acl_shrinker);
386 return 0;
387
388 error_2:
389 unregister_nfs4_fs();
390 error_1:
391 unregister_filesystem(&nfs_fs_type);
392 error_0:
393 return ret;
394 }
395
396 /*
397 * Unregister the NFS filesystems
398 */
399 void __exit unregister_nfs_fs(void)
400 {
401 unregister_shrinker(&acl_shrinker);
402 nfs_unregister_sysctl();
403 unregister_nfs4_fs();
404 unregister_filesystem(&nfs_fs_type);
405 }
406
407 void nfs_sb_active(struct super_block *sb)
408 {
409 struct nfs_server *server = NFS_SB(sb);
410
411 if (atomic_inc_return(&server->active) == 1)
412 atomic_inc(&sb->s_active);
413 }
414 EXPORT_SYMBOL_GPL(nfs_sb_active);
415
416 void nfs_sb_deactive(struct super_block *sb)
417 {
418 struct nfs_server *server = NFS_SB(sb);
419
420 if (atomic_dec_and_test(&server->active))
421 deactivate_super(sb);
422 }
423 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
424
425 /*
426 * Deliver file system statistics to userspace
427 */
428 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
429 {
430 struct nfs_server *server = NFS_SB(dentry->d_sb);
431 unsigned char blockbits;
432 unsigned long blockres;
433 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
434 struct nfs_fsstat res;
435 int error = -ENOMEM;
436
437 res.fattr = nfs_alloc_fattr();
438 if (res.fattr == NULL)
439 goto out_err;
440
441 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
442 if (unlikely(error == -ESTALE)) {
443 struct dentry *pd_dentry;
444
445 pd_dentry = dget_parent(dentry);
446 if (pd_dentry != NULL) {
447 nfs_zap_caches(pd_dentry->d_inode);
448 dput(pd_dentry);
449 }
450 }
451 nfs_free_fattr(res.fattr);
452 if (error < 0)
453 goto out_err;
454
455 buf->f_type = NFS_SUPER_MAGIC;
456
457 /*
458 * Current versions of glibc do not correctly handle the
459 * case where f_frsize != f_bsize. Eventually we want to
460 * report the value of wtmult in this field.
461 */
462 buf->f_frsize = dentry->d_sb->s_blocksize;
463
464 /*
465 * On most *nix systems, f_blocks, f_bfree, and f_bavail
466 * are reported in units of f_frsize. Linux hasn't had
467 * an f_frsize field in its statfs struct until recently,
468 * thus historically Linux's sys_statfs reports these
469 * fields in units of f_bsize.
470 */
471 buf->f_bsize = dentry->d_sb->s_blocksize;
472 blockbits = dentry->d_sb->s_blocksize_bits;
473 blockres = (1 << blockbits) - 1;
474 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
475 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
476 buf->f_bavail = (res.abytes + blockres) >> blockbits;
477
478 buf->f_files = res.tfiles;
479 buf->f_ffree = res.afiles;
480
481 buf->f_namelen = server->namelen;
482
483 return 0;
484
485 out_err:
486 dprintk("%s: statfs error = %d\n", __func__, -error);
487 return error;
488 }
489 EXPORT_SYMBOL_GPL(nfs_statfs);
490
491 /*
492 * Map the security flavour number to a name
493 */
494 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
495 {
496 static const struct {
497 rpc_authflavor_t flavour;
498 const char *str;
499 } sec_flavours[] = {
500 { RPC_AUTH_NULL, "null" },
501 { RPC_AUTH_UNIX, "sys" },
502 { RPC_AUTH_GSS_KRB5, "krb5" },
503 { RPC_AUTH_GSS_KRB5I, "krb5i" },
504 { RPC_AUTH_GSS_KRB5P, "krb5p" },
505 { RPC_AUTH_GSS_LKEY, "lkey" },
506 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
507 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
508 { RPC_AUTH_GSS_SPKM, "spkm" },
509 { RPC_AUTH_GSS_SPKMI, "spkmi" },
510 { RPC_AUTH_GSS_SPKMP, "spkmp" },
511 { UINT_MAX, "unknown" }
512 };
513 int i;
514
515 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
516 if (sec_flavours[i].flavour == flavour)
517 break;
518 }
519 return sec_flavours[i].str;
520 }
521
522 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
523 int showdefaults)
524 {
525 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
526
527 seq_printf(m, ",mountproto=");
528 switch (sap->sa_family) {
529 case AF_INET:
530 switch (nfss->mountd_protocol) {
531 case IPPROTO_UDP:
532 seq_printf(m, RPCBIND_NETID_UDP);
533 break;
534 case IPPROTO_TCP:
535 seq_printf(m, RPCBIND_NETID_TCP);
536 break;
537 default:
538 if (showdefaults)
539 seq_printf(m, "auto");
540 }
541 break;
542 case AF_INET6:
543 switch (nfss->mountd_protocol) {
544 case IPPROTO_UDP:
545 seq_printf(m, RPCBIND_NETID_UDP6);
546 break;
547 case IPPROTO_TCP:
548 seq_printf(m, RPCBIND_NETID_TCP6);
549 break;
550 default:
551 if (showdefaults)
552 seq_printf(m, "auto");
553 }
554 break;
555 default:
556 if (showdefaults)
557 seq_printf(m, "auto");
558 }
559 }
560
561 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
562 int showdefaults)
563 {
564 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
565
566 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
567 return;
568
569 switch (sap->sa_family) {
570 case AF_INET: {
571 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
572 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
573 break;
574 }
575 case AF_INET6: {
576 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
577 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
578 break;
579 }
580 default:
581 if (showdefaults)
582 seq_printf(m, ",mountaddr=unspecified");
583 }
584
585 if (nfss->mountd_version || showdefaults)
586 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
587 if ((nfss->mountd_port &&
588 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
589 showdefaults)
590 seq_printf(m, ",mountport=%u", nfss->mountd_port);
591
592 nfs_show_mountd_netid(m, nfss, showdefaults);
593 }
594
595 #if IS_ENABLED(CONFIG_NFS_V4)
596 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
597 int showdefaults)
598 {
599 struct nfs_client *clp = nfss->nfs_client;
600
601 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
602 }
603 #else
604 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
605 int showdefaults)
606 {
607 }
608 #endif
609
610 static void nfs_show_nfs_version(struct seq_file *m,
611 unsigned int version,
612 unsigned int minorversion)
613 {
614 seq_printf(m, ",vers=%u", version);
615 if (version == 4)
616 seq_printf(m, ".%u", minorversion);
617 }
618
619 /*
620 * Describe the mount options in force on this server representation
621 */
622 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
623 int showdefaults)
624 {
625 static const struct proc_nfs_info {
626 int flag;
627 const char *str;
628 const char *nostr;
629 } nfs_info[] = {
630 { NFS_MOUNT_SOFT, ",soft", ",hard" },
631 { NFS_MOUNT_POSIX, ",posix", "" },
632 { NFS_MOUNT_NOCTO, ",nocto", "" },
633 { NFS_MOUNT_NOAC, ",noac", "" },
634 { NFS_MOUNT_NONLM, ",nolock", "" },
635 { NFS_MOUNT_NOACL, ",noacl", "" },
636 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
637 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
638 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
639 { 0, NULL, NULL }
640 };
641 const struct proc_nfs_info *nfs_infop;
642 struct nfs_client *clp = nfss->nfs_client;
643 u32 version = clp->rpc_ops->version;
644 int local_flock, local_fcntl;
645
646 nfs_show_nfs_version(m, version, clp->cl_minorversion);
647 seq_printf(m, ",rsize=%u", nfss->rsize);
648 seq_printf(m, ",wsize=%u", nfss->wsize);
649 if (nfss->bsize != 0)
650 seq_printf(m, ",bsize=%u", nfss->bsize);
651 seq_printf(m, ",namlen=%u", nfss->namelen);
652 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
653 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
654 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
655 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
656 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
657 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
658 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
659 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
660 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
661 if (nfss->flags & nfs_infop->flag)
662 seq_puts(m, nfs_infop->str);
663 else
664 seq_puts(m, nfs_infop->nostr);
665 }
666 rcu_read_lock();
667 seq_printf(m, ",proto=%s",
668 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
669 rcu_read_unlock();
670 if (version == 4) {
671 if (nfss->port != NFS_PORT)
672 seq_printf(m, ",port=%u", nfss->port);
673 } else
674 if (nfss->port)
675 seq_printf(m, ",port=%u", nfss->port);
676
677 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
678 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
679 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
680
681 if (version != 4)
682 nfs_show_mountd_options(m, nfss, showdefaults);
683 else
684 nfs_show_nfsv4_options(m, nfss, showdefaults);
685
686 if (nfss->options & NFS_OPTION_FSCACHE)
687 seq_printf(m, ",fsc");
688
689 if (nfss->options & NFS_OPTION_MIGRATION)
690 seq_printf(m, ",migration");
691
692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
694 seq_printf(m, ",lookupcache=none");
695 else
696 seq_printf(m, ",lookupcache=pos");
697 }
698
699 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
700 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
701
702 if (!local_flock && !local_fcntl)
703 seq_printf(m, ",local_lock=none");
704 else if (local_flock && local_fcntl)
705 seq_printf(m, ",local_lock=all");
706 else if (local_flock)
707 seq_printf(m, ",local_lock=flock");
708 else
709 seq_printf(m, ",local_lock=posix");
710 }
711
712 /*
713 * Describe the mount options on this VFS mountpoint
714 */
715 int nfs_show_options(struct seq_file *m, struct dentry *root)
716 {
717 struct nfs_server *nfss = NFS_SB(root->d_sb);
718
719 nfs_show_mount_options(m, nfss, 0);
720
721 rcu_read_lock();
722 seq_printf(m, ",addr=%s",
723 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
724 RPC_DISPLAY_ADDR));
725 rcu_read_unlock();
726
727 return 0;
728 }
729 EXPORT_SYMBOL_GPL(nfs_show_options);
730
731 #if IS_ENABLED(CONFIG_NFS_V4)
732 #ifdef CONFIG_NFS_V4_1
733 static void show_sessions(struct seq_file *m, struct nfs_server *server)
734 {
735 if (nfs4_has_session(server->nfs_client))
736 seq_printf(m, ",sessions");
737 }
738 #else
739 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
740 #endif
741 #endif
742
743 #ifdef CONFIG_NFS_V4_1
744 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
745 {
746 seq_printf(m, ",pnfs=");
747 if (server->pnfs_curr_ld)
748 seq_printf(m, "%s", server->pnfs_curr_ld->name);
749 else
750 seq_printf(m, "not configured");
751 }
752
753 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
754 {
755 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
756 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
757 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
758 "date='%llu,%u'",
759 impl_id->name, impl_id->domain,
760 impl_id->date.seconds, impl_id->date.nseconds);
761 }
762 }
763 #else
764 #if IS_ENABLED(CONFIG_NFS_V4)
765 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
766 {
767 }
768 #endif
769 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
770 {
771 }
772 #endif
773
774 int nfs_show_devname(struct seq_file *m, struct dentry *root)
775 {
776 char *page = (char *) __get_free_page(GFP_KERNEL);
777 char *devname, *dummy;
778 int err = 0;
779 if (!page)
780 return -ENOMEM;
781 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
782 if (IS_ERR(devname))
783 err = PTR_ERR(devname);
784 else
785 seq_escape(m, devname, " \t\n\\");
786 free_page((unsigned long)page);
787 return err;
788 }
789 EXPORT_SYMBOL_GPL(nfs_show_devname);
790
791 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
792 {
793 seq_puts(m, "/");
794 return 0;
795 }
796 EXPORT_SYMBOL_GPL(nfs_show_path);
797
798 /*
799 * Present statistical information for this VFS mountpoint
800 */
801 int nfs_show_stats(struct seq_file *m, struct dentry *root)
802 {
803 int i, cpu;
804 struct nfs_server *nfss = NFS_SB(root->d_sb);
805 struct rpc_auth *auth = nfss->client->cl_auth;
806 struct nfs_iostats totals = { };
807
808 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
809
810 /*
811 * Display all mount option settings
812 */
813 seq_printf(m, "\n\topts:\t");
814 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
815 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
816 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
817 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
818 nfs_show_mount_options(m, nfss, 1);
819
820 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
821
822 show_implementation_id(m, nfss);
823
824 seq_printf(m, "\n\tcaps:\t");
825 seq_printf(m, "caps=0x%x", nfss->caps);
826 seq_printf(m, ",wtmult=%u", nfss->wtmult);
827 seq_printf(m, ",dtsize=%u", nfss->dtsize);
828 seq_printf(m, ",bsize=%u", nfss->bsize);
829 seq_printf(m, ",namlen=%u", nfss->namelen);
830
831 #if IS_ENABLED(CONFIG_NFS_V4)
832 if (nfss->nfs_client->rpc_ops->version == 4) {
833 seq_printf(m, "\n\tnfsv4:\t");
834 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
835 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
836 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
837 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
838 show_sessions(m, nfss);
839 show_pnfs(m, nfss);
840 }
841 #endif
842
843 /*
844 * Display security flavor in effect for this mount
845 */
846 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
847 if (auth->au_flavor)
848 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
849
850 /*
851 * Display superblock I/O counters
852 */
853 for_each_possible_cpu(cpu) {
854 struct nfs_iostats *stats;
855
856 preempt_disable();
857 stats = per_cpu_ptr(nfss->io_stats, cpu);
858
859 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
860 totals.events[i] += stats->events[i];
861 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
862 totals.bytes[i] += stats->bytes[i];
863 #ifdef CONFIG_NFS_FSCACHE
864 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
865 totals.fscache[i] += stats->fscache[i];
866 #endif
867
868 preempt_enable();
869 }
870
871 seq_printf(m, "\n\tevents:\t");
872 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
873 seq_printf(m, "%lu ", totals.events[i]);
874 seq_printf(m, "\n\tbytes:\t");
875 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
876 seq_printf(m, "%Lu ", totals.bytes[i]);
877 #ifdef CONFIG_NFS_FSCACHE
878 if (nfss->options & NFS_OPTION_FSCACHE) {
879 seq_printf(m, "\n\tfsc:\t");
880 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
881 seq_printf(m, "%Lu ", totals.bytes[i]);
882 }
883 #endif
884 seq_printf(m, "\n");
885
886 rpc_print_iostats(m, nfss->client);
887
888 return 0;
889 }
890 EXPORT_SYMBOL_GPL(nfs_show_stats);
891
892 /*
893 * Begin unmount by attempting to remove all automounted mountpoints we added
894 * in response to xdev traversals and referrals
895 */
896 void nfs_umount_begin(struct super_block *sb)
897 {
898 struct nfs_server *server;
899 struct rpc_clnt *rpc;
900
901 server = NFS_SB(sb);
902 /* -EIO all pending I/O */
903 rpc = server->client_acl;
904 if (!IS_ERR(rpc))
905 rpc_killall_tasks(rpc);
906 rpc = server->client;
907 if (!IS_ERR(rpc))
908 rpc_killall_tasks(rpc);
909 }
910 EXPORT_SYMBOL_GPL(nfs_umount_begin);
911
912 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
913 {
914 struct nfs_parsed_mount_data *data;
915
916 data = kzalloc(sizeof(*data), GFP_KERNEL);
917 if (data) {
918 data->acregmin = NFS_DEF_ACREGMIN;
919 data->acregmax = NFS_DEF_ACREGMAX;
920 data->acdirmin = NFS_DEF_ACDIRMIN;
921 data->acdirmax = NFS_DEF_ACDIRMAX;
922 data->mount_server.port = NFS_UNSPEC_PORT;
923 data->nfs_server.port = NFS_UNSPEC_PORT;
924 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
925 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
926 data->auth_flavor_len = 1;
927 data->minorversion = 0;
928 data->need_mount = true;
929 data->net = current->nsproxy->net_ns;
930 security_init_mnt_opts(&data->lsm_opts);
931 }
932 return data;
933 }
934
935 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
936 {
937 if (data) {
938 kfree(data->client_address);
939 kfree(data->mount_server.hostname);
940 kfree(data->nfs_server.export_path);
941 kfree(data->nfs_server.hostname);
942 kfree(data->fscache_uniq);
943 security_free_mnt_opts(&data->lsm_opts);
944 kfree(data);
945 }
946 }
947
948 /*
949 * Sanity-check a server address provided by the mount command.
950 *
951 * Address family must be initialized, and address must not be
952 * the ANY address for that family.
953 */
954 static int nfs_verify_server_address(struct sockaddr *addr)
955 {
956 switch (addr->sa_family) {
957 case AF_INET: {
958 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
959 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
960 }
961 case AF_INET6: {
962 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
963 return !ipv6_addr_any(sa);
964 }
965 }
966
967 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
968 return 0;
969 }
970
971 /*
972 * Select between a default port value and a user-specified port value.
973 * If a zero value is set, then autobind will be used.
974 */
975 static void nfs_set_port(struct sockaddr *sap, int *port,
976 const unsigned short default_port)
977 {
978 if (*port == NFS_UNSPEC_PORT)
979 *port = default_port;
980
981 rpc_set_port(sap, *port);
982 }
983
984 /*
985 * Sanity check the NFS transport protocol.
986 *
987 */
988 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
989 {
990 switch (mnt->nfs_server.protocol) {
991 case XPRT_TRANSPORT_UDP:
992 case XPRT_TRANSPORT_TCP:
993 case XPRT_TRANSPORT_RDMA:
994 break;
995 default:
996 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
997 }
998 }
999
1000 /*
1001 * For text based NFSv2/v3 mounts, the mount protocol transport default
1002 * settings should depend upon the specified NFS transport.
1003 */
1004 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1005 {
1006 nfs_validate_transport_protocol(mnt);
1007
1008 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1009 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1010 return;
1011 switch (mnt->nfs_server.protocol) {
1012 case XPRT_TRANSPORT_UDP:
1013 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1014 break;
1015 case XPRT_TRANSPORT_TCP:
1016 case XPRT_TRANSPORT_RDMA:
1017 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1018 }
1019 }
1020
1021 /*
1022 * Parse the value of the 'sec=' option.
1023 */
1024 static int nfs_parse_security_flavors(char *value,
1025 struct nfs_parsed_mount_data *mnt)
1026 {
1027 substring_t args[MAX_OPT_ARGS];
1028
1029 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1030
1031 switch (match_token(value, nfs_secflavor_tokens, args)) {
1032 case Opt_sec_none:
1033 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1034 break;
1035 case Opt_sec_sys:
1036 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1037 break;
1038 case Opt_sec_krb5:
1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1040 break;
1041 case Opt_sec_krb5i:
1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1043 break;
1044 case Opt_sec_krb5p:
1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1046 break;
1047 case Opt_sec_lkey:
1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1049 break;
1050 case Opt_sec_lkeyi:
1051 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1052 break;
1053 case Opt_sec_lkeyp:
1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1055 break;
1056 case Opt_sec_spkm:
1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1058 break;
1059 case Opt_sec_spkmi:
1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1061 break;
1062 case Opt_sec_spkmp:
1063 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1064 break;
1065 default:
1066 return 0;
1067 }
1068
1069 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1070 mnt->auth_flavor_len = 1;
1071 return 1;
1072 }
1073
1074 static int nfs_parse_version_string(char *string,
1075 struct nfs_parsed_mount_data *mnt,
1076 substring_t *args)
1077 {
1078 mnt->flags &= ~NFS_MOUNT_VER3;
1079 switch (match_token(string, nfs_vers_tokens, args)) {
1080 case Opt_vers_2:
1081 mnt->version = 2;
1082 break;
1083 case Opt_vers_3:
1084 mnt->flags |= NFS_MOUNT_VER3;
1085 mnt->version = 3;
1086 break;
1087 case Opt_vers_4:
1088 /* Backward compatibility option. In future,
1089 * the mount program should always supply
1090 * a NFSv4 minor version number.
1091 */
1092 mnt->version = 4;
1093 break;
1094 case Opt_vers_4_0:
1095 mnt->version = 4;
1096 mnt->minorversion = 0;
1097 break;
1098 case Opt_vers_4_1:
1099 mnt->version = 4;
1100 mnt->minorversion = 1;
1101 break;
1102 case Opt_vers_4_2:
1103 mnt->version = 4;
1104 mnt->minorversion = 2;
1105 break;
1106 default:
1107 return 0;
1108 }
1109 return 1;
1110 }
1111
1112 static int nfs_get_option_str(substring_t args[], char **option)
1113 {
1114 kfree(*option);
1115 *option = match_strdup(args);
1116 return !*option;
1117 }
1118
1119 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1120 {
1121 int rc;
1122 char *string;
1123
1124 string = match_strdup(args);
1125 if (string == NULL)
1126 return -ENOMEM;
1127 rc = kstrtoul(string, 10, option);
1128 kfree(string);
1129
1130 return rc;
1131 }
1132
1133 /*
1134 * Error-check and convert a string of mount options from user space into
1135 * a data structure. The whole mount string is processed; bad options are
1136 * skipped as they are encountered. If there were no errors, return 1;
1137 * otherwise return 0 (zero).
1138 */
1139 static int nfs_parse_mount_options(char *raw,
1140 struct nfs_parsed_mount_data *mnt)
1141 {
1142 char *p, *string, *secdata;
1143 int rc, sloppy = 0, invalid_option = 0;
1144 unsigned short protofamily = AF_UNSPEC;
1145 unsigned short mountfamily = AF_UNSPEC;
1146
1147 if (!raw) {
1148 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1149 return 1;
1150 }
1151 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1152
1153 secdata = alloc_secdata();
1154 if (!secdata)
1155 goto out_nomem;
1156
1157 rc = security_sb_copy_data(raw, secdata);
1158 if (rc)
1159 goto out_security_failure;
1160
1161 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1162 if (rc)
1163 goto out_security_failure;
1164
1165 free_secdata(secdata);
1166
1167 while ((p = strsep(&raw, ",")) != NULL) {
1168 substring_t args[MAX_OPT_ARGS];
1169 unsigned long option;
1170 int token;
1171
1172 if (!*p)
1173 continue;
1174
1175 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1176
1177 token = match_token(p, nfs_mount_option_tokens, args);
1178 switch (token) {
1179
1180 /*
1181 * boolean options: foo/nofoo
1182 */
1183 case Opt_soft:
1184 mnt->flags |= NFS_MOUNT_SOFT;
1185 break;
1186 case Opt_hard:
1187 mnt->flags &= ~NFS_MOUNT_SOFT;
1188 break;
1189 case Opt_posix:
1190 mnt->flags |= NFS_MOUNT_POSIX;
1191 break;
1192 case Opt_noposix:
1193 mnt->flags &= ~NFS_MOUNT_POSIX;
1194 break;
1195 case Opt_cto:
1196 mnt->flags &= ~NFS_MOUNT_NOCTO;
1197 break;
1198 case Opt_nocto:
1199 mnt->flags |= NFS_MOUNT_NOCTO;
1200 break;
1201 case Opt_ac:
1202 mnt->flags &= ~NFS_MOUNT_NOAC;
1203 break;
1204 case Opt_noac:
1205 mnt->flags |= NFS_MOUNT_NOAC;
1206 break;
1207 case Opt_lock:
1208 mnt->flags &= ~NFS_MOUNT_NONLM;
1209 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1210 NFS_MOUNT_LOCAL_FCNTL);
1211 break;
1212 case Opt_nolock:
1213 mnt->flags |= NFS_MOUNT_NONLM;
1214 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1215 NFS_MOUNT_LOCAL_FCNTL);
1216 break;
1217 case Opt_udp:
1218 mnt->flags &= ~NFS_MOUNT_TCP;
1219 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1220 break;
1221 case Opt_tcp:
1222 mnt->flags |= NFS_MOUNT_TCP;
1223 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1224 break;
1225 case Opt_rdma:
1226 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1227 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1228 xprt_load_transport(p);
1229 break;
1230 case Opt_acl:
1231 mnt->flags &= ~NFS_MOUNT_NOACL;
1232 break;
1233 case Opt_noacl:
1234 mnt->flags |= NFS_MOUNT_NOACL;
1235 break;
1236 case Opt_rdirplus:
1237 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1238 break;
1239 case Opt_nordirplus:
1240 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1241 break;
1242 case Opt_sharecache:
1243 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1244 break;
1245 case Opt_nosharecache:
1246 mnt->flags |= NFS_MOUNT_UNSHARED;
1247 break;
1248 case Opt_resvport:
1249 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1250 break;
1251 case Opt_noresvport:
1252 mnt->flags |= NFS_MOUNT_NORESVPORT;
1253 break;
1254 case Opt_fscache:
1255 mnt->options |= NFS_OPTION_FSCACHE;
1256 kfree(mnt->fscache_uniq);
1257 mnt->fscache_uniq = NULL;
1258 break;
1259 case Opt_nofscache:
1260 mnt->options &= ~NFS_OPTION_FSCACHE;
1261 kfree(mnt->fscache_uniq);
1262 mnt->fscache_uniq = NULL;
1263 break;
1264 case Opt_migration:
1265 mnt->options |= NFS_OPTION_MIGRATION;
1266 break;
1267 case Opt_nomigration:
1268 mnt->options &= NFS_OPTION_MIGRATION;
1269 break;
1270
1271 /*
1272 * options that take numeric values
1273 */
1274 case Opt_port:
1275 if (nfs_get_option_ul(args, &option) ||
1276 option > USHRT_MAX)
1277 goto out_invalid_value;
1278 mnt->nfs_server.port = option;
1279 break;
1280 case Opt_rsize:
1281 if (nfs_get_option_ul(args, &option))
1282 goto out_invalid_value;
1283 mnt->rsize = option;
1284 break;
1285 case Opt_wsize:
1286 if (nfs_get_option_ul(args, &option))
1287 goto out_invalid_value;
1288 mnt->wsize = option;
1289 break;
1290 case Opt_bsize:
1291 if (nfs_get_option_ul(args, &option))
1292 goto out_invalid_value;
1293 mnt->bsize = option;
1294 break;
1295 case Opt_timeo:
1296 if (nfs_get_option_ul(args, &option) || option == 0)
1297 goto out_invalid_value;
1298 mnt->timeo = option;
1299 break;
1300 case Opt_retrans:
1301 if (nfs_get_option_ul(args, &option) || option == 0)
1302 goto out_invalid_value;
1303 mnt->retrans = option;
1304 break;
1305 case Opt_acregmin:
1306 if (nfs_get_option_ul(args, &option))
1307 goto out_invalid_value;
1308 mnt->acregmin = option;
1309 break;
1310 case Opt_acregmax:
1311 if (nfs_get_option_ul(args, &option))
1312 goto out_invalid_value;
1313 mnt->acregmax = option;
1314 break;
1315 case Opt_acdirmin:
1316 if (nfs_get_option_ul(args, &option))
1317 goto out_invalid_value;
1318 mnt->acdirmin = option;
1319 break;
1320 case Opt_acdirmax:
1321 if (nfs_get_option_ul(args, &option))
1322 goto out_invalid_value;
1323 mnt->acdirmax = option;
1324 break;
1325 case Opt_actimeo:
1326 if (nfs_get_option_ul(args, &option))
1327 goto out_invalid_value;
1328 mnt->acregmin = mnt->acregmax =
1329 mnt->acdirmin = mnt->acdirmax = option;
1330 break;
1331 case Opt_namelen:
1332 if (nfs_get_option_ul(args, &option))
1333 goto out_invalid_value;
1334 mnt->namlen = option;
1335 break;
1336 case Opt_mountport:
1337 if (nfs_get_option_ul(args, &option) ||
1338 option > USHRT_MAX)
1339 goto out_invalid_value;
1340 mnt->mount_server.port = option;
1341 break;
1342 case Opt_mountvers:
1343 if (nfs_get_option_ul(args, &option) ||
1344 option < NFS_MNT_VERSION ||
1345 option > NFS_MNT3_VERSION)
1346 goto out_invalid_value;
1347 mnt->mount_server.version = option;
1348 break;
1349 case Opt_minorversion:
1350 if (nfs_get_option_ul(args, &option))
1351 goto out_invalid_value;
1352 if (option > NFS4_MAX_MINOR_VERSION)
1353 goto out_invalid_value;
1354 mnt->minorversion = option;
1355 break;
1356
1357 /*
1358 * options that take text values
1359 */
1360 case Opt_nfsvers:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
1364 rc = nfs_parse_version_string(string, mnt, args);
1365 kfree(string);
1366 if (!rc)
1367 goto out_invalid_value;
1368 break;
1369 case Opt_sec:
1370 string = match_strdup(args);
1371 if (string == NULL)
1372 goto out_nomem;
1373 rc = nfs_parse_security_flavors(string, mnt);
1374 kfree(string);
1375 if (!rc) {
1376 dfprintk(MOUNT, "NFS: unrecognized "
1377 "security flavor\n");
1378 return 0;
1379 }
1380 break;
1381 case Opt_proto:
1382 string = match_strdup(args);
1383 if (string == NULL)
1384 goto out_nomem;
1385 token = match_token(string,
1386 nfs_xprt_protocol_tokens, args);
1387
1388 protofamily = AF_INET;
1389 switch (token) {
1390 case Opt_xprt_udp6:
1391 protofamily = AF_INET6;
1392 case Opt_xprt_udp:
1393 mnt->flags &= ~NFS_MOUNT_TCP;
1394 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1395 break;
1396 case Opt_xprt_tcp6:
1397 protofamily = AF_INET6;
1398 case Opt_xprt_tcp:
1399 mnt->flags |= NFS_MOUNT_TCP;
1400 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1401 break;
1402 case Opt_xprt_rdma:
1403 /* vector side protocols to TCP */
1404 mnt->flags |= NFS_MOUNT_TCP;
1405 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1406 xprt_load_transport(string);
1407 break;
1408 default:
1409 dfprintk(MOUNT, "NFS: unrecognized "
1410 "transport protocol\n");
1411 kfree(string);
1412 return 0;
1413 }
1414 kfree(string);
1415 break;
1416 case Opt_mountproto:
1417 string = match_strdup(args);
1418 if (string == NULL)
1419 goto out_nomem;
1420 token = match_token(string,
1421 nfs_xprt_protocol_tokens, args);
1422 kfree(string);
1423
1424 mountfamily = AF_INET;
1425 switch (token) {
1426 case Opt_xprt_udp6:
1427 mountfamily = AF_INET6;
1428 case Opt_xprt_udp:
1429 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1430 break;
1431 case Opt_xprt_tcp6:
1432 mountfamily = AF_INET6;
1433 case Opt_xprt_tcp:
1434 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1435 break;
1436 case Opt_xprt_rdma: /* not used for side protocols */
1437 default:
1438 dfprintk(MOUNT, "NFS: unrecognized "
1439 "transport protocol\n");
1440 return 0;
1441 }
1442 break;
1443 case Opt_addr:
1444 string = match_strdup(args);
1445 if (string == NULL)
1446 goto out_nomem;
1447 mnt->nfs_server.addrlen =
1448 rpc_pton(mnt->net, string, strlen(string),
1449 (struct sockaddr *)
1450 &mnt->nfs_server.address,
1451 sizeof(mnt->nfs_server.address));
1452 kfree(string);
1453 if (mnt->nfs_server.addrlen == 0)
1454 goto out_invalid_address;
1455 break;
1456 case Opt_clientaddr:
1457 if (nfs_get_option_str(args, &mnt->client_address))
1458 goto out_nomem;
1459 break;
1460 case Opt_mounthost:
1461 if (nfs_get_option_str(args,
1462 &mnt->mount_server.hostname))
1463 goto out_nomem;
1464 break;
1465 case Opt_mountaddr:
1466 string = match_strdup(args);
1467 if (string == NULL)
1468 goto out_nomem;
1469 mnt->mount_server.addrlen =
1470 rpc_pton(mnt->net, string, strlen(string),
1471 (struct sockaddr *)
1472 &mnt->mount_server.address,
1473 sizeof(mnt->mount_server.address));
1474 kfree(string);
1475 if (mnt->mount_server.addrlen == 0)
1476 goto out_invalid_address;
1477 break;
1478 case Opt_lookupcache:
1479 string = match_strdup(args);
1480 if (string == NULL)
1481 goto out_nomem;
1482 token = match_token(string,
1483 nfs_lookupcache_tokens, args);
1484 kfree(string);
1485 switch (token) {
1486 case Opt_lookupcache_all:
1487 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1488 break;
1489 case Opt_lookupcache_positive:
1490 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1491 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1492 break;
1493 case Opt_lookupcache_none:
1494 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1495 break;
1496 default:
1497 dfprintk(MOUNT, "NFS: invalid "
1498 "lookupcache argument\n");
1499 return 0;
1500 };
1501 break;
1502 case Opt_fscache_uniq:
1503 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1504 goto out_nomem;
1505 mnt->options |= NFS_OPTION_FSCACHE;
1506 break;
1507 case Opt_local_lock:
1508 string = match_strdup(args);
1509 if (string == NULL)
1510 goto out_nomem;
1511 token = match_token(string, nfs_local_lock_tokens,
1512 args);
1513 kfree(string);
1514 switch (token) {
1515 case Opt_local_lock_all:
1516 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1517 NFS_MOUNT_LOCAL_FCNTL);
1518 break;
1519 case Opt_local_lock_flock:
1520 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1521 break;
1522 case Opt_local_lock_posix:
1523 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1524 break;
1525 case Opt_local_lock_none:
1526 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1527 NFS_MOUNT_LOCAL_FCNTL);
1528 break;
1529 default:
1530 dfprintk(MOUNT, "NFS: invalid "
1531 "local_lock argument\n");
1532 return 0;
1533 };
1534 break;
1535
1536 /*
1537 * Special options
1538 */
1539 case Opt_sloppy:
1540 sloppy = 1;
1541 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1542 break;
1543 case Opt_userspace:
1544 case Opt_deprecated:
1545 dfprintk(MOUNT, "NFS: ignoring mount option "
1546 "'%s'\n", p);
1547 break;
1548
1549 default:
1550 invalid_option = 1;
1551 dfprintk(MOUNT, "NFS: unrecognized mount option "
1552 "'%s'\n", p);
1553 }
1554 }
1555
1556 if (!sloppy && invalid_option)
1557 return 0;
1558
1559 if (mnt->minorversion && mnt->version != 4)
1560 goto out_minorversion_mismatch;
1561
1562 if (mnt->options & NFS_OPTION_MIGRATION &&
1563 mnt->version != 4 && mnt->minorversion != 0)
1564 goto out_migration_misuse;
1565
1566 /*
1567 * verify that any proto=/mountproto= options match the address
1568 * families in the addr=/mountaddr= options.
1569 */
1570 if (protofamily != AF_UNSPEC &&
1571 protofamily != mnt->nfs_server.address.ss_family)
1572 goto out_proto_mismatch;
1573
1574 if (mountfamily != AF_UNSPEC) {
1575 if (mnt->mount_server.addrlen) {
1576 if (mountfamily != mnt->mount_server.address.ss_family)
1577 goto out_mountproto_mismatch;
1578 } else {
1579 if (mountfamily != mnt->nfs_server.address.ss_family)
1580 goto out_mountproto_mismatch;
1581 }
1582 }
1583
1584 return 1;
1585
1586 out_mountproto_mismatch:
1587 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1588 "option\n");
1589 return 0;
1590 out_proto_mismatch:
1591 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1592 return 0;
1593 out_invalid_address:
1594 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1595 return 0;
1596 out_invalid_value:
1597 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1598 return 0;
1599 out_minorversion_mismatch:
1600 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1601 "minorversion=%u\n", mnt->version, mnt->minorversion);
1602 return 0;
1603 out_migration_misuse:
1604 printk(KERN_INFO
1605 "NFS: 'migration' not supported for this NFS version\n");
1606 return 0;
1607 out_nomem:
1608 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1609 return 0;
1610 out_security_failure:
1611 free_secdata(secdata);
1612 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1613 return 0;
1614 }
1615
1616 /*
1617 * Ensure that the specified authtype in args->auth_flavors[0] is supported by
1618 * the server. Returns 0 if it's ok, and -EACCES if not.
1619 */
1620 static int nfs_verify_authflavor(struct nfs_parsed_mount_data *args,
1621 rpc_authflavor_t *server_authlist, unsigned int count)
1622 {
1623 unsigned int i;
1624
1625 /*
1626 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1627 * must be in the list returned by the server.
1628 *
1629 * AUTH_NULL has a special meaning when it's in the server list - it
1630 * means that the server will ignore the rpc creds, so any flavor
1631 * can be used.
1632 */
1633 for (i = 0; i < count; i++) {
1634 if (args->auth_flavors[0] == server_authlist[i] ||
1635 server_authlist[i] == RPC_AUTH_NULL)
1636 goto out;
1637 }
1638
1639 dfprintk(MOUNT, "NFS: auth flavor %u not supported by server\n",
1640 args->auth_flavors[0]);
1641 return -EACCES;
1642
1643 out:
1644 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1645 return 0;
1646 }
1647
1648 /*
1649 * Use the remote server's MOUNT service to request the NFS file handle
1650 * corresponding to the provided path.
1651 */
1652 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1653 struct nfs_fh *root_fh,
1654 rpc_authflavor_t *server_authlist,
1655 unsigned int *server_authlist_len)
1656 {
1657 struct nfs_mount_request request = {
1658 .sap = (struct sockaddr *)
1659 &args->mount_server.address,
1660 .dirpath = args->nfs_server.export_path,
1661 .protocol = args->mount_server.protocol,
1662 .fh = root_fh,
1663 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1664 .auth_flav_len = server_authlist_len,
1665 .auth_flavs = server_authlist,
1666 .net = args->net,
1667 };
1668 int status;
1669
1670 if (args->mount_server.version == 0) {
1671 switch (args->version) {
1672 default:
1673 args->mount_server.version = NFS_MNT3_VERSION;
1674 break;
1675 case 2:
1676 args->mount_server.version = NFS_MNT_VERSION;
1677 }
1678 }
1679 request.version = args->mount_server.version;
1680
1681 if (args->mount_server.hostname)
1682 request.hostname = args->mount_server.hostname;
1683 else
1684 request.hostname = args->nfs_server.hostname;
1685
1686 /*
1687 * Construct the mount server's address.
1688 */
1689 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1690 memcpy(request.sap, &args->nfs_server.address,
1691 args->nfs_server.addrlen);
1692 args->mount_server.addrlen = args->nfs_server.addrlen;
1693 }
1694 request.salen = args->mount_server.addrlen;
1695 nfs_set_port(request.sap, &args->mount_server.port, 0);
1696
1697 /*
1698 * Now ask the mount server to map our export path
1699 * to a file handle.
1700 */
1701 status = nfs_mount(&request);
1702 if (status != 0) {
1703 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1704 request.hostname, status);
1705 return status;
1706 }
1707
1708 return 0;
1709 }
1710
1711 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1712 struct nfs_subversion *nfs_mod)
1713 {
1714 int status;
1715 unsigned int i;
1716 bool tried_auth_unix = false;
1717 bool auth_null_in_list = false;
1718 struct nfs_server *server = ERR_PTR(-EACCES);
1719 struct nfs_parsed_mount_data *args = mount_info->parsed;
1720 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1721 unsigned int authlist_len = ARRAY_SIZE(authlist);
1722
1723 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1724 &authlist_len);
1725 if (status)
1726 return ERR_PTR(status);
1727
1728 /*
1729 * Was a sec= authflavor specified in the options? First, verify
1730 * whether the server supports it, and then just try to use it if so.
1731 */
1732 if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR) {
1733 status = nfs_verify_authflavor(args, authlist, authlist_len);
1734 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1735 if (status)
1736 return ERR_PTR(status);
1737 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1738 }
1739
1740 /*
1741 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1742 * SHOULD prefer the flavor listed first. However, some servers list
1743 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1744 */
1745 for (i = 0; i < authlist_len; ++i) {
1746 rpc_authflavor_t flavor;
1747 struct rpcsec_gss_info info;
1748
1749 flavor = authlist[i];
1750 switch (flavor) {
1751 case RPC_AUTH_UNIX:
1752 tried_auth_unix = true;
1753 break;
1754 case RPC_AUTH_NULL:
1755 auth_null_in_list = true;
1756 continue;
1757 default:
1758 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1759 continue;
1760 /* Fallthrough */
1761 }
1762 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1763 args->auth_flavors[0] = flavor;
1764 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1765 if (!IS_ERR(server))
1766 return server;
1767 }
1768
1769 /*
1770 * Nothing we tried so far worked. At this point, give up if we've
1771 * already tried AUTH_UNIX or if the server's list doesn't contain
1772 * AUTH_NULL
1773 */
1774 if (tried_auth_unix || !auth_null_in_list)
1775 return server;
1776
1777 /* Last chance! Try AUTH_UNIX */
1778 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1779 args->auth_flavors[0] = RPC_AUTH_UNIX;
1780 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1781 }
1782
1783 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1784 struct nfs_mount_info *mount_info,
1785 struct nfs_subversion *nfs_mod)
1786 {
1787 struct nfs_server *server;
1788
1789 if (mount_info->parsed->need_mount)
1790 server = nfs_try_mount_request(mount_info, nfs_mod);
1791 else
1792 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1793
1794 if (IS_ERR(server))
1795 return ERR_CAST(server);
1796
1797 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1798 }
1799 EXPORT_SYMBOL_GPL(nfs_try_mount);
1800
1801 /*
1802 * Split "dev_name" into "hostname:export_path".
1803 *
1804 * The leftmost colon demarks the split between the server's hostname
1805 * and the export path. If the hostname starts with a left square
1806 * bracket, then it may contain colons.
1807 *
1808 * Note: caller frees hostname and export path, even on error.
1809 */
1810 static int nfs_parse_devname(const char *dev_name,
1811 char **hostname, size_t maxnamlen,
1812 char **export_path, size_t maxpathlen)
1813 {
1814 size_t len;
1815 char *end;
1816
1817 /* Is the host name protected with square brakcets? */
1818 if (*dev_name == '[') {
1819 end = strchr(++dev_name, ']');
1820 if (end == NULL || end[1] != ':')
1821 goto out_bad_devname;
1822
1823 len = end - dev_name;
1824 end++;
1825 } else {
1826 char *comma;
1827
1828 end = strchr(dev_name, ':');
1829 if (end == NULL)
1830 goto out_bad_devname;
1831 len = end - dev_name;
1832
1833 /* kill possible hostname list: not supported */
1834 comma = strchr(dev_name, ',');
1835 if (comma != NULL && comma < end)
1836 *comma = 0;
1837 }
1838
1839 if (len > maxnamlen)
1840 goto out_hostname;
1841
1842 /* N.B. caller will free nfs_server.hostname in all cases */
1843 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1844 if (*hostname == NULL)
1845 goto out_nomem;
1846 len = strlen(++end);
1847 if (len > maxpathlen)
1848 goto out_path;
1849 *export_path = kstrndup(end, len, GFP_KERNEL);
1850 if (!*export_path)
1851 goto out_nomem;
1852
1853 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1854 return 0;
1855
1856 out_bad_devname:
1857 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1858 return -EINVAL;
1859
1860 out_nomem:
1861 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1862 return -ENOMEM;
1863
1864 out_hostname:
1865 dfprintk(MOUNT, "NFS: server hostname too long\n");
1866 return -ENAMETOOLONG;
1867
1868 out_path:
1869 dfprintk(MOUNT, "NFS: export pathname too long\n");
1870 return -ENAMETOOLONG;
1871 }
1872
1873 /*
1874 * Validate the NFS2/NFS3 mount data
1875 * - fills in the mount root filehandle
1876 *
1877 * For option strings, user space handles the following behaviors:
1878 *
1879 * + DNS: mapping server host name to IP address ("addr=" option)
1880 *
1881 * + failure mode: how to behave if a mount request can't be handled
1882 * immediately ("fg/bg" option)
1883 *
1884 * + retry: how often to retry a mount request ("retry=" option)
1885 *
1886 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1887 * mountproto=tcp after mountproto=udp, and so on
1888 */
1889 static int nfs23_validate_mount_data(void *options,
1890 struct nfs_parsed_mount_data *args,
1891 struct nfs_fh *mntfh,
1892 const char *dev_name)
1893 {
1894 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1895 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1896
1897 if (data == NULL)
1898 goto out_no_data;
1899
1900 args->version = NFS_DEFAULT_VERSION;
1901 switch (data->version) {
1902 case 1:
1903 data->namlen = 0;
1904 case 2:
1905 data->bsize = 0;
1906 case 3:
1907 if (data->flags & NFS_MOUNT_VER3)
1908 goto out_no_v3;
1909 data->root.size = NFS2_FHSIZE;
1910 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1911 case 4:
1912 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1913 goto out_no_sec;
1914 case 5:
1915 memset(data->context, 0, sizeof(data->context));
1916 case 6:
1917 if (data->flags & NFS_MOUNT_VER3) {
1918 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1919 goto out_invalid_fh;
1920 mntfh->size = data->root.size;
1921 args->version = 3;
1922 } else {
1923 mntfh->size = NFS2_FHSIZE;
1924 args->version = 2;
1925 }
1926
1927
1928 memcpy(mntfh->data, data->root.data, mntfh->size);
1929 if (mntfh->size < sizeof(mntfh->data))
1930 memset(mntfh->data + mntfh->size, 0,
1931 sizeof(mntfh->data) - mntfh->size);
1932
1933 /*
1934 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1935 * can deal with.
1936 */
1937 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1938 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1939 args->rsize = data->rsize;
1940 args->wsize = data->wsize;
1941 args->timeo = data->timeo;
1942 args->retrans = data->retrans;
1943 args->acregmin = data->acregmin;
1944 args->acregmax = data->acregmax;
1945 args->acdirmin = data->acdirmin;
1946 args->acdirmax = data->acdirmax;
1947 args->need_mount = false;
1948
1949 memcpy(sap, &data->addr, sizeof(data->addr));
1950 args->nfs_server.addrlen = sizeof(data->addr);
1951 args->nfs_server.port = ntohs(data->addr.sin_port);
1952 if (!nfs_verify_server_address(sap))
1953 goto out_no_address;
1954
1955 if (!(data->flags & NFS_MOUNT_TCP))
1956 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1957 /* N.B. caller will free nfs_server.hostname in all cases */
1958 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1959 args->namlen = data->namlen;
1960 args->bsize = data->bsize;
1961
1962 args->auth_flavors[0] = RPC_AUTH_UNIX;
1963 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1964 args->auth_flavors[0] = data->pseudoflavor;
1965 if (!args->nfs_server.hostname)
1966 goto out_nomem;
1967
1968 if (!(data->flags & NFS_MOUNT_NONLM))
1969 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1970 NFS_MOUNT_LOCAL_FCNTL);
1971 else
1972 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1973 NFS_MOUNT_LOCAL_FCNTL);
1974 /*
1975 * The legacy version 6 binary mount data from userspace has a
1976 * field used only to transport selinux information into the
1977 * the kernel. To continue to support that functionality we
1978 * have a touch of selinux knowledge here in the NFS code. The
1979 * userspace code converted context=blah to just blah so we are
1980 * converting back to the full string selinux understands.
1981 */
1982 if (data->context[0]){
1983 #ifdef CONFIG_SECURITY_SELINUX
1984 int rc;
1985 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1986 if (!opts_str)
1987 return -ENOMEM;
1988 strcpy(opts_str, "context=");
1989 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1990 strcat(opts_str, &data->context[0]);
1991 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1992 kfree(opts_str);
1993 if (rc)
1994 return rc;
1995 #else
1996 return -EINVAL;
1997 #endif
1998 }
1999
2000 break;
2001 default:
2002 return NFS_TEXT_DATA;
2003 }
2004
2005 #if !IS_ENABLED(CONFIG_NFS_V3)
2006 if (args->version == 3)
2007 goto out_v3_not_compiled;
2008 #endif /* !CONFIG_NFS_V3 */
2009
2010 return 0;
2011
2012 out_no_data:
2013 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2014 return -EINVAL;
2015
2016 out_no_v3:
2017 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2018 data->version);
2019 return -EINVAL;
2020
2021 out_no_sec:
2022 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2023 return -EINVAL;
2024
2025 #if !IS_ENABLED(CONFIG_NFS_V3)
2026 out_v3_not_compiled:
2027 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2028 return -EPROTONOSUPPORT;
2029 #endif /* !CONFIG_NFS_V3 */
2030
2031 out_nomem:
2032 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2033 return -ENOMEM;
2034
2035 out_no_address:
2036 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2037 return -EINVAL;
2038
2039 out_invalid_fh:
2040 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2041 return -EINVAL;
2042 }
2043
2044 #if IS_ENABLED(CONFIG_NFS_V4)
2045 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2046 void *options,
2047 struct nfs_parsed_mount_data *args,
2048 struct nfs_fh *mntfh,
2049 const char *dev_name)
2050 {
2051 if (fs_type == &nfs_fs_type)
2052 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2053 return nfs4_validate_mount_data(options, args, dev_name);
2054 }
2055 #else
2056 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2057 void *options,
2058 struct nfs_parsed_mount_data *args,
2059 struct nfs_fh *mntfh,
2060 const char *dev_name)
2061 {
2062 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2063 }
2064 #endif
2065
2066 static int nfs_validate_text_mount_data(void *options,
2067 struct nfs_parsed_mount_data *args,
2068 const char *dev_name)
2069 {
2070 int port = 0;
2071 int max_namelen = PAGE_SIZE;
2072 int max_pathlen = NFS_MAXPATHLEN;
2073 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2074
2075 if (nfs_parse_mount_options((char *)options, args) == 0)
2076 return -EINVAL;
2077
2078 if (!nfs_verify_server_address(sap))
2079 goto out_no_address;
2080
2081 if (args->version == 4) {
2082 #if IS_ENABLED(CONFIG_NFS_V4)
2083 port = NFS_PORT;
2084 max_namelen = NFS4_MAXNAMLEN;
2085 max_pathlen = NFS4_MAXPATHLEN;
2086 nfs_validate_transport_protocol(args);
2087 nfs4_validate_mount_flags(args);
2088 #else
2089 goto out_v4_not_compiled;
2090 #endif /* CONFIG_NFS_V4 */
2091 } else
2092 nfs_set_mount_transport_protocol(args);
2093
2094 nfs_set_port(sap, &args->nfs_server.port, port);
2095
2096 if (args->auth_flavor_len > 1)
2097 goto out_bad_auth;
2098
2099 return nfs_parse_devname(dev_name,
2100 &args->nfs_server.hostname,
2101 max_namelen,
2102 &args->nfs_server.export_path,
2103 max_pathlen);
2104
2105 #if !IS_ENABLED(CONFIG_NFS_V4)
2106 out_v4_not_compiled:
2107 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2108 return -EPROTONOSUPPORT;
2109 #endif /* !CONFIG_NFS_V4 */
2110
2111 out_no_address:
2112 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2113 return -EINVAL;
2114
2115 out_bad_auth:
2116 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2117 return -EINVAL;
2118 }
2119
2120 static int
2121 nfs_compare_remount_data(struct nfs_server *nfss,
2122 struct nfs_parsed_mount_data *data)
2123 {
2124 if (data->flags != nfss->flags ||
2125 data->rsize != nfss->rsize ||
2126 data->wsize != nfss->wsize ||
2127 data->retrans != nfss->client->cl_timeout->to_retries ||
2128 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2129 data->acregmin != nfss->acregmin / HZ ||
2130 data->acregmax != nfss->acregmax / HZ ||
2131 data->acdirmin != nfss->acdirmin / HZ ||
2132 data->acdirmax != nfss->acdirmax / HZ ||
2133 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2134 data->nfs_server.port != nfss->port ||
2135 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2136 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2137 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2138 return -EINVAL;
2139
2140 return 0;
2141 }
2142
2143 int
2144 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2145 {
2146 int error;
2147 struct nfs_server *nfss = sb->s_fs_info;
2148 struct nfs_parsed_mount_data *data;
2149 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2150 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2151 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2152
2153 /*
2154 * Userspace mount programs that send binary options generally send
2155 * them populated with default values. We have no way to know which
2156 * ones were explicitly specified. Fall back to legacy behavior and
2157 * just return success.
2158 */
2159 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2160 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2161 options->version <= 6))))
2162 return 0;
2163
2164 data = kzalloc(sizeof(*data), GFP_KERNEL);
2165 if (data == NULL)
2166 return -ENOMEM;
2167
2168 /* fill out struct with values from existing mount */
2169 data->flags = nfss->flags;
2170 data->rsize = nfss->rsize;
2171 data->wsize = nfss->wsize;
2172 data->retrans = nfss->client->cl_timeout->to_retries;
2173 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2174 data->acregmin = nfss->acregmin / HZ;
2175 data->acregmax = nfss->acregmax / HZ;
2176 data->acdirmin = nfss->acdirmin / HZ;
2177 data->acdirmax = nfss->acdirmax / HZ;
2178 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2179 data->nfs_server.port = nfss->port;
2180 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2181 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2182 data->nfs_server.addrlen);
2183
2184 /* overwrite those values with any that were specified */
2185 error = nfs_parse_mount_options((char *)options, data);
2186 if (error < 0)
2187 goto out;
2188
2189 /*
2190 * noac is a special case. It implies -o sync, but that's not
2191 * necessarily reflected in the mtab options. do_remount_sb
2192 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2193 * remount options, so we have to explicitly reset it.
2194 */
2195 if (data->flags & NFS_MOUNT_NOAC)
2196 *flags |= MS_SYNCHRONOUS;
2197
2198 /* compare new mount options with old ones */
2199 error = nfs_compare_remount_data(nfss, data);
2200 out:
2201 kfree(data);
2202 return error;
2203 }
2204 EXPORT_SYMBOL_GPL(nfs_remount);
2205
2206 /*
2207 * Initialise the common bits of the superblock
2208 */
2209 inline void nfs_initialise_sb(struct super_block *sb)
2210 {
2211 struct nfs_server *server = NFS_SB(sb);
2212
2213 sb->s_magic = NFS_SUPER_MAGIC;
2214
2215 /* We probably want something more informative here */
2216 snprintf(sb->s_id, sizeof(sb->s_id),
2217 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2218
2219 if (sb->s_blocksize == 0)
2220 sb->s_blocksize = nfs_block_bits(server->wsize,
2221 &sb->s_blocksize_bits);
2222
2223 sb->s_bdi = &server->backing_dev_info;
2224
2225 nfs_super_set_maxbytes(sb, server->maxfilesize);
2226 }
2227
2228 /*
2229 * Finish setting up an NFS2/3 superblock
2230 */
2231 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2232 {
2233 struct nfs_parsed_mount_data *data = mount_info->parsed;
2234 struct nfs_server *server = NFS_SB(sb);
2235
2236 sb->s_blocksize_bits = 0;
2237 sb->s_blocksize = 0;
2238 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2239 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2240 if (data && data->bsize)
2241 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2242
2243 if (server->nfs_client->rpc_ops->version != 2) {
2244 /* The VFS shouldn't apply the umask to mode bits. We will do
2245 * so ourselves when necessary.
2246 */
2247 sb->s_flags |= MS_POSIXACL;
2248 sb->s_time_gran = 1;
2249 }
2250
2251 nfs_initialise_sb(sb);
2252 }
2253 EXPORT_SYMBOL_GPL(nfs_fill_super);
2254
2255 /*
2256 * Finish setting up a cloned NFS2/3/4 superblock
2257 */
2258 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2259 {
2260 const struct super_block *old_sb = mount_info->cloned->sb;
2261 struct nfs_server *server = NFS_SB(sb);
2262
2263 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2264 sb->s_blocksize = old_sb->s_blocksize;
2265 sb->s_maxbytes = old_sb->s_maxbytes;
2266 sb->s_xattr = old_sb->s_xattr;
2267 sb->s_op = old_sb->s_op;
2268 sb->s_time_gran = 1;
2269
2270 if (server->nfs_client->rpc_ops->version != 2) {
2271 /* The VFS shouldn't apply the umask to mode bits. We will do
2272 * so ourselves when necessary.
2273 */
2274 sb->s_flags |= MS_POSIXACL;
2275 }
2276
2277 nfs_initialise_sb(sb);
2278 }
2279
2280 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2281 {
2282 const struct nfs_server *a = s->s_fs_info;
2283 const struct rpc_clnt *clnt_a = a->client;
2284 const struct rpc_clnt *clnt_b = b->client;
2285
2286 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2287 goto Ebusy;
2288 if (a->nfs_client != b->nfs_client)
2289 goto Ebusy;
2290 if (a->flags != b->flags)
2291 goto Ebusy;
2292 if (a->wsize != b->wsize)
2293 goto Ebusy;
2294 if (a->rsize != b->rsize)
2295 goto Ebusy;
2296 if (a->acregmin != b->acregmin)
2297 goto Ebusy;
2298 if (a->acregmax != b->acregmax)
2299 goto Ebusy;
2300 if (a->acdirmin != b->acdirmin)
2301 goto Ebusy;
2302 if (a->acdirmax != b->acdirmax)
2303 goto Ebusy;
2304 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2305 goto Ebusy;
2306 return 1;
2307 Ebusy:
2308 return 0;
2309 }
2310
2311 struct nfs_sb_mountdata {
2312 struct nfs_server *server;
2313 int mntflags;
2314 };
2315
2316 static int nfs_set_super(struct super_block *s, void *data)
2317 {
2318 struct nfs_sb_mountdata *sb_mntdata = data;
2319 struct nfs_server *server = sb_mntdata->server;
2320 int ret;
2321
2322 s->s_flags = sb_mntdata->mntflags;
2323 s->s_fs_info = server;
2324 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2325 ret = set_anon_super(s, server);
2326 if (ret == 0)
2327 server->s_dev = s->s_dev;
2328 return ret;
2329 }
2330
2331 static int nfs_compare_super_address(struct nfs_server *server1,
2332 struct nfs_server *server2)
2333 {
2334 struct sockaddr *sap1, *sap2;
2335
2336 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2337 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2338
2339 if (sap1->sa_family != sap2->sa_family)
2340 return 0;
2341
2342 switch (sap1->sa_family) {
2343 case AF_INET: {
2344 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2345 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2346 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2347 return 0;
2348 if (sin1->sin_port != sin2->sin_port)
2349 return 0;
2350 break;
2351 }
2352 case AF_INET6: {
2353 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2354 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2355 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2356 return 0;
2357 if (sin1->sin6_port != sin2->sin6_port)
2358 return 0;
2359 break;
2360 }
2361 default:
2362 return 0;
2363 }
2364
2365 return 1;
2366 }
2367
2368 static int nfs_compare_super(struct super_block *sb, void *data)
2369 {
2370 struct nfs_sb_mountdata *sb_mntdata = data;
2371 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2372 int mntflags = sb_mntdata->mntflags;
2373
2374 if (!nfs_compare_super_address(old, server))
2375 return 0;
2376 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2377 if (old->flags & NFS_MOUNT_UNSHARED)
2378 return 0;
2379 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2380 return 0;
2381 return nfs_compare_mount_options(sb, server, mntflags);
2382 }
2383
2384 #ifdef CONFIG_NFS_FSCACHE
2385 static void nfs_get_cache_cookie(struct super_block *sb,
2386 struct nfs_parsed_mount_data *parsed,
2387 struct nfs_clone_mount *cloned)
2388 {
2389 struct nfs_server *nfss = NFS_SB(sb);
2390 char *uniq = NULL;
2391 int ulen = 0;
2392
2393 nfss->fscache_key = NULL;
2394 nfss->fscache = NULL;
2395
2396 if (parsed) {
2397 if (!(parsed->options & NFS_OPTION_FSCACHE))
2398 return;
2399 if (parsed->fscache_uniq) {
2400 uniq = parsed->fscache_uniq;
2401 ulen = strlen(parsed->fscache_uniq);
2402 }
2403 } else if (cloned) {
2404 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2405 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2406 return;
2407 if (mnt_s->fscache_key) {
2408 uniq = mnt_s->fscache_key->key.uniquifier;
2409 ulen = mnt_s->fscache_key->key.uniq_len;
2410 };
2411 } else
2412 return;
2413
2414 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2415 }
2416 #else
2417 static void nfs_get_cache_cookie(struct super_block *sb,
2418 struct nfs_parsed_mount_data *parsed,
2419 struct nfs_clone_mount *cloned)
2420 {
2421 }
2422 #endif
2423
2424 static int nfs_bdi_register(struct nfs_server *server)
2425 {
2426 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2427 }
2428
2429 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2430 struct nfs_mount_info *mount_info)
2431 {
2432 int error;
2433 unsigned long kflags = 0, kflags_out = 0;
2434 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2435 kflags |= SECURITY_LSM_NATIVE_LABELS;
2436
2437 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2438 kflags, &kflags_out);
2439 if (error)
2440 goto err;
2441
2442 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2443 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2444 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2445 err:
2446 return error;
2447 }
2448 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2449
2450 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2451 struct nfs_mount_info *mount_info)
2452 {
2453 /* clone any lsm security options from the parent to the new sb */
2454 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2455 return -ESTALE;
2456 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2457 }
2458 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2459
2460 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2461 int flags, const char *dev_name,
2462 struct nfs_mount_info *mount_info,
2463 struct nfs_subversion *nfs_mod)
2464 {
2465 struct super_block *s;
2466 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2467 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2468 struct nfs_sb_mountdata sb_mntdata = {
2469 .mntflags = flags,
2470 .server = server,
2471 };
2472 int error;
2473
2474 if (server->flags & NFS_MOUNT_UNSHARED)
2475 compare_super = NULL;
2476
2477 /* -o noac implies -o sync */
2478 if (server->flags & NFS_MOUNT_NOAC)
2479 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2480
2481 /* Get a superblock - note that we may end up sharing one that already exists */
2482 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2483 if (IS_ERR(s)) {
2484 mntroot = ERR_CAST(s);
2485 goto out_err_nosb;
2486 }
2487
2488 if (s->s_fs_info != server) {
2489 nfs_free_server(server);
2490 server = NULL;
2491 } else {
2492 error = nfs_bdi_register(server);
2493 if (error) {
2494 mntroot = ERR_PTR(error);
2495 goto error_splat_bdi;
2496 }
2497 }
2498
2499 if (!s->s_root) {
2500 /* initial superblock/root creation */
2501 mount_info->fill_super(s, mount_info);
2502 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2503 }
2504
2505 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2506 if (IS_ERR(mntroot))
2507 goto error_splat_super;
2508
2509 error = mount_info->set_security(s, mntroot, mount_info);
2510 if (error)
2511 goto error_splat_root;
2512
2513 s->s_flags |= MS_ACTIVE;
2514
2515 out:
2516 return mntroot;
2517
2518 out_err_nosb:
2519 nfs_free_server(server);
2520 goto out;
2521
2522 error_splat_root:
2523 dput(mntroot);
2524 mntroot = ERR_PTR(error);
2525 error_splat_super:
2526 if (server && !s->s_root)
2527 bdi_unregister(&server->backing_dev_info);
2528 error_splat_bdi:
2529 deactivate_locked_super(s);
2530 goto out;
2531 }
2532 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2533
2534 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2535 int flags, const char *dev_name, void *raw_data)
2536 {
2537 struct nfs_mount_info mount_info = {
2538 .fill_super = nfs_fill_super,
2539 .set_security = nfs_set_sb_security,
2540 };
2541 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2542 struct nfs_subversion *nfs_mod;
2543 int error;
2544
2545 mount_info.parsed = nfs_alloc_parsed_mount_data();
2546 mount_info.mntfh = nfs_alloc_fhandle();
2547 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2548 goto out;
2549
2550 /* Validate the mount data */
2551 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2552 if (error == NFS_TEXT_DATA)
2553 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2554 if (error < 0) {
2555 mntroot = ERR_PTR(error);
2556 goto out;
2557 }
2558
2559 nfs_mod = get_nfs_version(mount_info.parsed->version);
2560 if (IS_ERR(nfs_mod)) {
2561 mntroot = ERR_CAST(nfs_mod);
2562 goto out;
2563 }
2564
2565 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2566
2567 put_nfs_version(nfs_mod);
2568 out:
2569 nfs_free_parsed_mount_data(mount_info.parsed);
2570 nfs_free_fhandle(mount_info.mntfh);
2571 return mntroot;
2572 }
2573 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2574
2575 /*
2576 * Ensure that we unregister the bdi before kill_anon_super
2577 * releases the device name
2578 */
2579 void nfs_put_super(struct super_block *s)
2580 {
2581 struct nfs_server *server = NFS_SB(s);
2582
2583 bdi_unregister(&server->backing_dev_info);
2584 }
2585 EXPORT_SYMBOL_GPL(nfs_put_super);
2586
2587 /*
2588 * Destroy an NFS2/3 superblock
2589 */
2590 void nfs_kill_super(struct super_block *s)
2591 {
2592 struct nfs_server *server = NFS_SB(s);
2593
2594 kill_anon_super(s);
2595 nfs_fscache_release_super_cookie(s);
2596 nfs_free_server(server);
2597 }
2598 EXPORT_SYMBOL_GPL(nfs_kill_super);
2599
2600 /*
2601 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2602 */
2603 static struct dentry *
2604 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2605 const char *dev_name, void *raw_data)
2606 {
2607 struct nfs_clone_mount *data = raw_data;
2608 struct nfs_mount_info mount_info = {
2609 .fill_super = nfs_clone_super,
2610 .set_security = nfs_clone_sb_security,
2611 .cloned = data,
2612 };
2613 struct nfs_server *server;
2614 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2615 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2616
2617 dprintk("--> nfs_xdev_mount()\n");
2618
2619 mount_info.mntfh = mount_info.cloned->fh;
2620
2621 /* create a new volume representation */
2622 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2623
2624 if (IS_ERR(server))
2625 mntroot = ERR_CAST(server);
2626 else
2627 mntroot = nfs_fs_mount_common(server, flags,
2628 dev_name, &mount_info, nfs_mod);
2629
2630 dprintk("<-- nfs_xdev_mount() = %ld\n",
2631 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2632 return mntroot;
2633 }
2634
2635 #if IS_ENABLED(CONFIG_NFS_V4)
2636
2637 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2638 {
2639 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2640 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2641 }
2642
2643 /*
2644 * Validate NFSv4 mount options
2645 */
2646 static int nfs4_validate_mount_data(void *options,
2647 struct nfs_parsed_mount_data *args,
2648 const char *dev_name)
2649 {
2650 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2651 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2652 char *c;
2653
2654 if (data == NULL)
2655 goto out_no_data;
2656
2657 args->version = 4;
2658
2659 switch (data->version) {
2660 case 1:
2661 if (data->host_addrlen > sizeof(args->nfs_server.address))
2662 goto out_no_address;
2663 if (data->host_addrlen == 0)
2664 goto out_no_address;
2665 args->nfs_server.addrlen = data->host_addrlen;
2666 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2667 return -EFAULT;
2668 if (!nfs_verify_server_address(sap))
2669 goto out_no_address;
2670 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2671
2672 args->auth_flavors[0] = RPC_AUTH_UNIX;
2673 if (data->auth_flavourlen) {
2674 if (data->auth_flavourlen > 1)
2675 goto out_inval_auth;
2676 if (copy_from_user(&args->auth_flavors[0],
2677 data->auth_flavours,
2678 sizeof(args->auth_flavors[0])))
2679 return -EFAULT;
2680 }
2681
2682 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2683 if (IS_ERR(c))
2684 return PTR_ERR(c);
2685 args->nfs_server.hostname = c;
2686
2687 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2688 if (IS_ERR(c))
2689 return PTR_ERR(c);
2690 args->nfs_server.export_path = c;
2691 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2692
2693 c = strndup_user(data->client_addr.data, 16);
2694 if (IS_ERR(c))
2695 return PTR_ERR(c);
2696 args->client_address = c;
2697
2698 /*
2699 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2700 * can deal with.
2701 */
2702
2703 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2704 args->rsize = data->rsize;
2705 args->wsize = data->wsize;
2706 args->timeo = data->timeo;
2707 args->retrans = data->retrans;
2708 args->acregmin = data->acregmin;
2709 args->acregmax = data->acregmax;
2710 args->acdirmin = data->acdirmin;
2711 args->acdirmax = data->acdirmax;
2712 args->nfs_server.protocol = data->proto;
2713 nfs_validate_transport_protocol(args);
2714
2715 break;
2716 default:
2717 return NFS_TEXT_DATA;
2718 }
2719
2720 return 0;
2721
2722 out_no_data:
2723 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2724 return -EINVAL;
2725
2726 out_inval_auth:
2727 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2728 data->auth_flavourlen);
2729 return -EINVAL;
2730
2731 out_no_address:
2732 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2733 return -EINVAL;
2734 }
2735
2736 /*
2737 * NFS v4 module parameters need to stay in the
2738 * NFS client for backwards compatibility
2739 */
2740 unsigned int nfs_callback_set_tcpport;
2741 unsigned short nfs_callback_tcpport;
2742 /* Default cache timeout is 10 minutes */
2743 unsigned int nfs_idmap_cache_timeout = 600;
2744 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2745 bool nfs4_disable_idmapping = true;
2746 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2747 unsigned short send_implementation_id = 1;
2748 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2749
2750 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2751 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2752 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2753 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2754 EXPORT_SYMBOL_GPL(max_session_slots);
2755 EXPORT_SYMBOL_GPL(send_implementation_id);
2756 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2757
2758 #define NFS_CALLBACK_MAXPORTNR (65535U)
2759
2760 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2761 {
2762 unsigned long num;
2763 int ret;
2764
2765 if (!val)
2766 return -EINVAL;
2767 ret = kstrtoul(val, 0, &num);
2768 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2769 return -EINVAL;
2770 *((unsigned int *)kp->arg) = num;
2771 return 0;
2772 }
2773 static struct kernel_param_ops param_ops_portnr = {
2774 .set = param_set_portnr,
2775 .get = param_get_uint,
2776 };
2777 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2778
2779 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2780 module_param(nfs_idmap_cache_timeout, int, 0644);
2781 module_param(nfs4_disable_idmapping, bool, 0644);
2782 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2783 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2784 MODULE_PARM_DESC(nfs4_disable_idmapping,
2785 "Turn off NFSv4 idmapping when using 'sec=sys'");
2786 module_param(max_session_slots, ushort, 0644);
2787 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2788 "requests the client will negotiate");
2789 module_param(send_implementation_id, ushort, 0644);
2790 MODULE_PARM_DESC(send_implementation_id,
2791 "Send implementation ID with NFSv4.1 exchange_id");
2792 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2793
2794 #endif /* CONFIG_NFS_V4 */
Linus' kernel tree