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mwifiex: failure path handling in mwifiex_add_virtual_intf()
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/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 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
365 .seeks = DEFAULT_SEEKS,
366 };
367
368 /*
369 * Register the NFS filesystems
370 */
371 int __init register_nfs_fs(void)
372 {
373 int ret;
374
375 ret = register_filesystem(&nfs_fs_type);
376 if (ret < 0)
377 goto error_0;
378
379 ret = register_nfs4_fs();
380 if (ret < 0)
381 goto error_1;
382
383 ret = nfs_register_sysctl();
384 if (ret < 0)
385 goto error_2;
386 register_shrinker(&acl_shrinker);
387 return 0;
388
389 error_2:
390 unregister_nfs4_fs();
391 error_1:
392 unregister_filesystem(&nfs_fs_type);
393 error_0:
394 return ret;
395 }
396
397 /*
398 * Unregister the NFS filesystems
399 */
400 void __exit unregister_nfs_fs(void)
401 {
402 unregister_shrinker(&acl_shrinker);
403 nfs_unregister_sysctl();
404 unregister_nfs4_fs();
405 unregister_filesystem(&nfs_fs_type);
406 }
407
408 void nfs_sb_active(struct super_block *sb)
409 {
410 struct nfs_server *server = NFS_SB(sb);
411
412 if (atomic_inc_return(&server->active) == 1)
413 atomic_inc(&sb->s_active);
414 }
415 EXPORT_SYMBOL_GPL(nfs_sb_active);
416
417 void nfs_sb_deactive(struct super_block *sb)
418 {
419 struct nfs_server *server = NFS_SB(sb);
420
421 if (atomic_dec_and_test(&server->active))
422 deactivate_super(sb);
423 }
424 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
425
426 /*
427 * Deliver file system statistics to userspace
428 */
429 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
430 {
431 struct nfs_server *server = NFS_SB(dentry->d_sb);
432 unsigned char blockbits;
433 unsigned long blockres;
434 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
435 struct nfs_fsstat res;
436 int error = -ENOMEM;
437
438 res.fattr = nfs_alloc_fattr();
439 if (res.fattr == NULL)
440 goto out_err;
441
442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
443 if (unlikely(error == -ESTALE)) {
444 struct dentry *pd_dentry;
445
446 pd_dentry = dget_parent(dentry);
447 if (pd_dentry != NULL) {
448 nfs_zap_caches(pd_dentry->d_inode);
449 dput(pd_dentry);
450 }
451 }
452 nfs_free_fattr(res.fattr);
453 if (error < 0)
454 goto out_err;
455
456 buf->f_type = NFS_SUPER_MAGIC;
457
458 /*
459 * Current versions of glibc do not correctly handle the
460 * case where f_frsize != f_bsize. Eventually we want to
461 * report the value of wtmult in this field.
462 */
463 buf->f_frsize = dentry->d_sb->s_blocksize;
464
465 /*
466 * On most *nix systems, f_blocks, f_bfree, and f_bavail
467 * are reported in units of f_frsize. Linux hasn't had
468 * an f_frsize field in its statfs struct until recently,
469 * thus historically Linux's sys_statfs reports these
470 * fields in units of f_bsize.
471 */
472 buf->f_bsize = dentry->d_sb->s_blocksize;
473 blockbits = dentry->d_sb->s_blocksize_bits;
474 blockres = (1 << blockbits) - 1;
475 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
476 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
477 buf->f_bavail = (res.abytes + blockres) >> blockbits;
478
479 buf->f_files = res.tfiles;
480 buf->f_ffree = res.afiles;
481
482 buf->f_namelen = server->namelen;
483
484 return 0;
485
486 out_err:
487 dprintk("%s: statfs error = %d\n", __func__, -error);
488 return error;
489 }
490 EXPORT_SYMBOL_GPL(nfs_statfs);
491
492 /*
493 * Map the security flavour number to a name
494 */
495 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
496 {
497 static const struct {
498 rpc_authflavor_t flavour;
499 const char *str;
500 } sec_flavours[] = {
501 { RPC_AUTH_NULL, "null" },
502 { RPC_AUTH_UNIX, "sys" },
503 { RPC_AUTH_GSS_KRB5, "krb5" },
504 { RPC_AUTH_GSS_KRB5I, "krb5i" },
505 { RPC_AUTH_GSS_KRB5P, "krb5p" },
506 { RPC_AUTH_GSS_LKEY, "lkey" },
507 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
508 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
509 { RPC_AUTH_GSS_SPKM, "spkm" },
510 { RPC_AUTH_GSS_SPKMI, "spkmi" },
511 { RPC_AUTH_GSS_SPKMP, "spkmp" },
512 { UINT_MAX, "unknown" }
513 };
514 int i;
515
516 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
517 if (sec_flavours[i].flavour == flavour)
518 break;
519 }
520 return sec_flavours[i].str;
521 }
522
523 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
524 int showdefaults)
525 {
526 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
527
528 seq_printf(m, ",mountproto=");
529 switch (sap->sa_family) {
530 case AF_INET:
531 switch (nfss->mountd_protocol) {
532 case IPPROTO_UDP:
533 seq_printf(m, RPCBIND_NETID_UDP);
534 break;
535 case IPPROTO_TCP:
536 seq_printf(m, RPCBIND_NETID_TCP);
537 break;
538 default:
539 if (showdefaults)
540 seq_printf(m, "auto");
541 }
542 break;
543 case AF_INET6:
544 switch (nfss->mountd_protocol) {
545 case IPPROTO_UDP:
546 seq_printf(m, RPCBIND_NETID_UDP6);
547 break;
548 case IPPROTO_TCP:
549 seq_printf(m, RPCBIND_NETID_TCP6);
550 break;
551 default:
552 if (showdefaults)
553 seq_printf(m, "auto");
554 }
555 break;
556 default:
557 if (showdefaults)
558 seq_printf(m, "auto");
559 }
560 }
561
562 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
563 int showdefaults)
564 {
565 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
566
567 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
568 return;
569
570 switch (sap->sa_family) {
571 case AF_INET: {
572 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
573 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
574 break;
575 }
576 case AF_INET6: {
577 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
578 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
579 break;
580 }
581 default:
582 if (showdefaults)
583 seq_printf(m, ",mountaddr=unspecified");
584 }
585
586 if (nfss->mountd_version || showdefaults)
587 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
588 if ((nfss->mountd_port &&
589 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
590 showdefaults)
591 seq_printf(m, ",mountport=%u", nfss->mountd_port);
592
593 nfs_show_mountd_netid(m, nfss, showdefaults);
594 }
595
596 #if IS_ENABLED(CONFIG_NFS_V4)
597 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
598 int showdefaults)
599 {
600 struct nfs_client *clp = nfss->nfs_client;
601
602 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
603 }
604 #else
605 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607 {
608 }
609 #endif
610
611 static void nfs_show_nfs_version(struct seq_file *m,
612 unsigned int version,
613 unsigned int minorversion)
614 {
615 seq_printf(m, ",vers=%u", version);
616 if (version == 4)
617 seq_printf(m, ".%u", minorversion);
618 }
619
620 /*
621 * Describe the mount options in force on this server representation
622 */
623 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
624 int showdefaults)
625 {
626 static const struct proc_nfs_info {
627 int flag;
628 const char *str;
629 const char *nostr;
630 } nfs_info[] = {
631 { NFS_MOUNT_SOFT, ",soft", ",hard" },
632 { NFS_MOUNT_POSIX, ",posix", "" },
633 { NFS_MOUNT_NOCTO, ",nocto", "" },
634 { NFS_MOUNT_NOAC, ",noac", "" },
635 { NFS_MOUNT_NONLM, ",nolock", "" },
636 { NFS_MOUNT_NOACL, ",noacl", "" },
637 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
638 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
639 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
640 { 0, NULL, NULL }
641 };
642 const struct proc_nfs_info *nfs_infop;
643 struct nfs_client *clp = nfss->nfs_client;
644 u32 version = clp->rpc_ops->version;
645 int local_flock, local_fcntl;
646
647 nfs_show_nfs_version(m, version, clp->cl_minorversion);
648 seq_printf(m, ",rsize=%u", nfss->rsize);
649 seq_printf(m, ",wsize=%u", nfss->wsize);
650 if (nfss->bsize != 0)
651 seq_printf(m, ",bsize=%u", nfss->bsize);
652 seq_printf(m, ",namlen=%u", nfss->namelen);
653 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
654 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
655 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
656 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
657 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
658 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
659 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
660 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
661 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
662 if (nfss->flags & nfs_infop->flag)
663 seq_puts(m, nfs_infop->str);
664 else
665 seq_puts(m, nfs_infop->nostr);
666 }
667 rcu_read_lock();
668 seq_printf(m, ",proto=%s",
669 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
670 rcu_read_unlock();
671 if (version == 4) {
672 if (nfss->port != NFS_PORT)
673 seq_printf(m, ",port=%u", nfss->port);
674 } else
675 if (nfss->port)
676 seq_printf(m, ",port=%u", nfss->port);
677
678 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
679 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
680 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
681
682 if (version != 4)
683 nfs_show_mountd_options(m, nfss, showdefaults);
684 else
685 nfs_show_nfsv4_options(m, nfss, showdefaults);
686
687 if (nfss->options & NFS_OPTION_FSCACHE)
688 seq_printf(m, ",fsc");
689
690 if (nfss->options & NFS_OPTION_MIGRATION)
691 seq_printf(m, ",migration");
692
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
696 else
697 seq_printf(m, ",lookupcache=pos");
698 }
699
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702
703 if (!local_flock && !local_fcntl)
704 seq_printf(m, ",local_lock=none");
705 else if (local_flock && local_fcntl)
706 seq_printf(m, ",local_lock=all");
707 else if (local_flock)
708 seq_printf(m, ",local_lock=flock");
709 else
710 seq_printf(m, ",local_lock=posix");
711 }
712
713 /*
714 * Describe the mount options on this VFS mountpoint
715 */
716 int nfs_show_options(struct seq_file *m, struct dentry *root)
717 {
718 struct nfs_server *nfss = NFS_SB(root->d_sb);
719
720 nfs_show_mount_options(m, nfss, 0);
721
722 rcu_read_lock();
723 seq_printf(m, ",addr=%s",
724 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
725 RPC_DISPLAY_ADDR));
726 rcu_read_unlock();
727
728 return 0;
729 }
730 EXPORT_SYMBOL_GPL(nfs_show_options);
731
732 #if IS_ENABLED(CONFIG_NFS_V4)
733 #ifdef CONFIG_NFS_V4_1
734 static void show_sessions(struct seq_file *m, struct nfs_server *server)
735 {
736 if (nfs4_has_session(server->nfs_client))
737 seq_printf(m, ",sessions");
738 }
739 #else
740 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
741 #endif
742 #endif
743
744 #ifdef CONFIG_NFS_V4_1
745 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
746 {
747 seq_printf(m, ",pnfs=");
748 if (server->pnfs_curr_ld)
749 seq_printf(m, "%s", server->pnfs_curr_ld->name);
750 else
751 seq_printf(m, "not configured");
752 }
753
754 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
755 {
756 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
757 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
758 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
759 "date='%llu,%u'",
760 impl_id->name, impl_id->domain,
761 impl_id->date.seconds, impl_id->date.nseconds);
762 }
763 }
764 #else
765 #if IS_ENABLED(CONFIG_NFS_V4)
766 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
767 {
768 }
769 #endif
770 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
771 {
772 }
773 #endif
774
775 int nfs_show_devname(struct seq_file *m, struct dentry *root)
776 {
777 char *page = (char *) __get_free_page(GFP_KERNEL);
778 char *devname, *dummy;
779 int err = 0;
780 if (!page)
781 return -ENOMEM;
782 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
783 if (IS_ERR(devname))
784 err = PTR_ERR(devname);
785 else
786 seq_escape(m, devname, " \t\n\\");
787 free_page((unsigned long)page);
788 return err;
789 }
790 EXPORT_SYMBOL_GPL(nfs_show_devname);
791
792 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
793 {
794 seq_puts(m, "/");
795 return 0;
796 }
797 EXPORT_SYMBOL_GPL(nfs_show_path);
798
799 /*
800 * Present statistical information for this VFS mountpoint
801 */
802 int nfs_show_stats(struct seq_file *m, struct dentry *root)
803 {
804 int i, cpu;
805 struct nfs_server *nfss = NFS_SB(root->d_sb);
806 struct rpc_auth *auth = nfss->client->cl_auth;
807 struct nfs_iostats totals = { };
808
809 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
810
811 /*
812 * Display all mount option settings
813 */
814 seq_printf(m, "\n\topts:\t");
815 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
816 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
817 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
818 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
819 nfs_show_mount_options(m, nfss, 1);
820
821 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
822
823 show_implementation_id(m, nfss);
824
825 seq_printf(m, "\n\tcaps:\t");
826 seq_printf(m, "caps=0x%x", nfss->caps);
827 seq_printf(m, ",wtmult=%u", nfss->wtmult);
828 seq_printf(m, ",dtsize=%u", nfss->dtsize);
829 seq_printf(m, ",bsize=%u", nfss->bsize);
830 seq_printf(m, ",namlen=%u", nfss->namelen);
831
832 #if IS_ENABLED(CONFIG_NFS_V4)
833 if (nfss->nfs_client->rpc_ops->version == 4) {
834 seq_printf(m, "\n\tnfsv4:\t");
835 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
836 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
837 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
838 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
839 show_sessions(m, nfss);
840 show_pnfs(m, nfss);
841 }
842 #endif
843
844 /*
845 * Display security flavor in effect for this mount
846 */
847 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
848 if (auth->au_flavor)
849 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
850
851 /*
852 * Display superblock I/O counters
853 */
854 for_each_possible_cpu(cpu) {
855 struct nfs_iostats *stats;
856
857 preempt_disable();
858 stats = per_cpu_ptr(nfss->io_stats, cpu);
859
860 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
861 totals.events[i] += stats->events[i];
862 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863 totals.bytes[i] += stats->bytes[i];
864 #ifdef CONFIG_NFS_FSCACHE
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 totals.fscache[i] += stats->fscache[i];
867 #endif
868
869 preempt_enable();
870 }
871
872 seq_printf(m, "\n\tevents:\t");
873 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
874 seq_printf(m, "%lu ", totals.events[i]);
875 seq_printf(m, "\n\tbytes:\t");
876 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
877 seq_printf(m, "%Lu ", totals.bytes[i]);
878 #ifdef CONFIG_NFS_FSCACHE
879 if (nfss->options & NFS_OPTION_FSCACHE) {
880 seq_printf(m, "\n\tfsc:\t");
881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
882 seq_printf(m, "%Lu ", totals.bytes[i]);
883 }
884 #endif
885 seq_printf(m, "\n");
886
887 rpc_print_iostats(m, nfss->client);
888
889 return 0;
890 }
891 EXPORT_SYMBOL_GPL(nfs_show_stats);
892
893 /*
894 * Begin unmount by attempting to remove all automounted mountpoints we added
895 * in response to xdev traversals and referrals
896 */
897 void nfs_umount_begin(struct super_block *sb)
898 {
899 struct nfs_server *server;
900 struct rpc_clnt *rpc;
901
902 server = NFS_SB(sb);
903 /* -EIO all pending I/O */
904 rpc = server->client_acl;
905 if (!IS_ERR(rpc))
906 rpc_killall_tasks(rpc);
907 rpc = server->client;
908 if (!IS_ERR(rpc))
909 rpc_killall_tasks(rpc);
910 }
911 EXPORT_SYMBOL_GPL(nfs_umount_begin);
912
913 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
914 {
915 struct nfs_parsed_mount_data *data;
916
917 data = kzalloc(sizeof(*data), GFP_KERNEL);
918 if (data) {
919 data->acregmin = NFS_DEF_ACREGMIN;
920 data->acregmax = NFS_DEF_ACREGMAX;
921 data->acdirmin = NFS_DEF_ACDIRMIN;
922 data->acdirmax = NFS_DEF_ACDIRMAX;
923 data->mount_server.port = NFS_UNSPEC_PORT;
924 data->nfs_server.port = NFS_UNSPEC_PORT;
925 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
926 data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
927 data->auth_flavor_len = 0;
928 data->minorversion = 0;
929 data->need_mount = true;
930 data->net = current->nsproxy->net_ns;
931 security_init_mnt_opts(&data->lsm_opts);
932 }
933 return data;
934 }
935
936 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
937 {
938 if (data) {
939 kfree(data->client_address);
940 kfree(data->mount_server.hostname);
941 kfree(data->nfs_server.export_path);
942 kfree(data->nfs_server.hostname);
943 kfree(data->fscache_uniq);
944 security_free_mnt_opts(&data->lsm_opts);
945 kfree(data);
946 }
947 }
948
949 /*
950 * Sanity-check a server address provided by the mount command.
951 *
952 * Address family must be initialized, and address must not be
953 * the ANY address for that family.
954 */
955 static int nfs_verify_server_address(struct sockaddr *addr)
956 {
957 switch (addr->sa_family) {
958 case AF_INET: {
959 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
960 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
961 }
962 case AF_INET6: {
963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
964 return !ipv6_addr_any(sa);
965 }
966 }
967
968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
969 return 0;
970 }
971
972 /*
973 * Select between a default port value and a user-specified port value.
974 * If a zero value is set, then autobind will be used.
975 */
976 static void nfs_set_port(struct sockaddr *sap, int *port,
977 const unsigned short default_port)
978 {
979 if (*port == NFS_UNSPEC_PORT)
980 *port = default_port;
981
982 rpc_set_port(sap, *port);
983 }
984
985 /*
986 * Sanity check the NFS transport protocol.
987 *
988 */
989 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
990 {
991 switch (mnt->nfs_server.protocol) {
992 case XPRT_TRANSPORT_UDP:
993 case XPRT_TRANSPORT_TCP:
994 case XPRT_TRANSPORT_RDMA:
995 break;
996 default:
997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
998 }
999 }
1000
1001 /*
1002 * For text based NFSv2/v3 mounts, the mount protocol transport default
1003 * settings should depend upon the specified NFS transport.
1004 */
1005 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1006 {
1007 nfs_validate_transport_protocol(mnt);
1008
1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1011 return;
1012 switch (mnt->nfs_server.protocol) {
1013 case XPRT_TRANSPORT_UDP:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1015 break;
1016 case XPRT_TRANSPORT_TCP:
1017 case XPRT_TRANSPORT_RDMA:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1019 }
1020 }
1021
1022 static void nfs_set_auth_parsed_mount_data(struct nfs_parsed_mount_data *data,
1023 rpc_authflavor_t pseudoflavor)
1024 {
1025 data->auth_flavors[0] = pseudoflavor;
1026 data->auth_flavor_len = 1;
1027 }
1028
1029 /*
1030 * Parse the value of the 'sec=' option.
1031 */
1032 static int nfs_parse_security_flavors(char *value,
1033 struct nfs_parsed_mount_data *mnt)
1034 {
1035 substring_t args[MAX_OPT_ARGS];
1036 rpc_authflavor_t pseudoflavor;
1037
1038 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1039
1040 switch (match_token(value, nfs_secflavor_tokens, args)) {
1041 case Opt_sec_none:
1042 pseudoflavor = RPC_AUTH_NULL;
1043 break;
1044 case Opt_sec_sys:
1045 pseudoflavor = RPC_AUTH_UNIX;
1046 break;
1047 case Opt_sec_krb5:
1048 pseudoflavor = RPC_AUTH_GSS_KRB5;
1049 break;
1050 case Opt_sec_krb5i:
1051 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1052 break;
1053 case Opt_sec_krb5p:
1054 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1055 break;
1056 case Opt_sec_lkey:
1057 pseudoflavor = RPC_AUTH_GSS_LKEY;
1058 break;
1059 case Opt_sec_lkeyi:
1060 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1061 break;
1062 case Opt_sec_lkeyp:
1063 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1064 break;
1065 case Opt_sec_spkm:
1066 pseudoflavor = RPC_AUTH_GSS_SPKM;
1067 break;
1068 case Opt_sec_spkmi:
1069 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1070 break;
1071 case Opt_sec_spkmp:
1072 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1073 break;
1074 default:
1075 return 0;
1076 }
1077
1078 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1079 nfs_set_auth_parsed_mount_data(mnt, pseudoflavor);
1080 return 1;
1081 }
1082
1083 static int nfs_parse_version_string(char *string,
1084 struct nfs_parsed_mount_data *mnt,
1085 substring_t *args)
1086 {
1087 mnt->flags &= ~NFS_MOUNT_VER3;
1088 switch (match_token(string, nfs_vers_tokens, args)) {
1089 case Opt_vers_2:
1090 mnt->version = 2;
1091 break;
1092 case Opt_vers_3:
1093 mnt->flags |= NFS_MOUNT_VER3;
1094 mnt->version = 3;
1095 break;
1096 case Opt_vers_4:
1097 /* Backward compatibility option. In future,
1098 * the mount program should always supply
1099 * a NFSv4 minor version number.
1100 */
1101 mnt->version = 4;
1102 break;
1103 case Opt_vers_4_0:
1104 mnt->version = 4;
1105 mnt->minorversion = 0;
1106 break;
1107 case Opt_vers_4_1:
1108 mnt->version = 4;
1109 mnt->minorversion = 1;
1110 break;
1111 case Opt_vers_4_2:
1112 mnt->version = 4;
1113 mnt->minorversion = 2;
1114 break;
1115 default:
1116 return 0;
1117 }
1118 return 1;
1119 }
1120
1121 static int nfs_get_option_str(substring_t args[], char **option)
1122 {
1123 kfree(*option);
1124 *option = match_strdup(args);
1125 return !*option;
1126 }
1127
1128 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1129 {
1130 int rc;
1131 char *string;
1132
1133 string = match_strdup(args);
1134 if (string == NULL)
1135 return -ENOMEM;
1136 rc = kstrtoul(string, 10, option);
1137 kfree(string);
1138
1139 return rc;
1140 }
1141
1142 /*
1143 * Error-check and convert a string of mount options from user space into
1144 * a data structure. The whole mount string is processed; bad options are
1145 * skipped as they are encountered. If there were no errors, return 1;
1146 * otherwise return 0 (zero).
1147 */
1148 static int nfs_parse_mount_options(char *raw,
1149 struct nfs_parsed_mount_data *mnt)
1150 {
1151 char *p, *string, *secdata;
1152 int rc, sloppy = 0, invalid_option = 0;
1153 unsigned short protofamily = AF_UNSPEC;
1154 unsigned short mountfamily = AF_UNSPEC;
1155
1156 if (!raw) {
1157 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1158 return 1;
1159 }
1160 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1161
1162 secdata = alloc_secdata();
1163 if (!secdata)
1164 goto out_nomem;
1165
1166 rc = security_sb_copy_data(raw, secdata);
1167 if (rc)
1168 goto out_security_failure;
1169
1170 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1171 if (rc)
1172 goto out_security_failure;
1173
1174 free_secdata(secdata);
1175
1176 while ((p = strsep(&raw, ",")) != NULL) {
1177 substring_t args[MAX_OPT_ARGS];
1178 unsigned long option;
1179 int token;
1180
1181 if (!*p)
1182 continue;
1183
1184 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1185
1186 token = match_token(p, nfs_mount_option_tokens, args);
1187 switch (token) {
1188
1189 /*
1190 * boolean options: foo/nofoo
1191 */
1192 case Opt_soft:
1193 mnt->flags |= NFS_MOUNT_SOFT;
1194 break;
1195 case Opt_hard:
1196 mnt->flags &= ~NFS_MOUNT_SOFT;
1197 break;
1198 case Opt_posix:
1199 mnt->flags |= NFS_MOUNT_POSIX;
1200 break;
1201 case Opt_noposix:
1202 mnt->flags &= ~NFS_MOUNT_POSIX;
1203 break;
1204 case Opt_cto:
1205 mnt->flags &= ~NFS_MOUNT_NOCTO;
1206 break;
1207 case Opt_nocto:
1208 mnt->flags |= NFS_MOUNT_NOCTO;
1209 break;
1210 case Opt_ac:
1211 mnt->flags &= ~NFS_MOUNT_NOAC;
1212 break;
1213 case Opt_noac:
1214 mnt->flags |= NFS_MOUNT_NOAC;
1215 break;
1216 case Opt_lock:
1217 mnt->flags &= ~NFS_MOUNT_NONLM;
1218 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1219 NFS_MOUNT_LOCAL_FCNTL);
1220 break;
1221 case Opt_nolock:
1222 mnt->flags |= NFS_MOUNT_NONLM;
1223 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1224 NFS_MOUNT_LOCAL_FCNTL);
1225 break;
1226 case Opt_udp:
1227 mnt->flags &= ~NFS_MOUNT_TCP;
1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1229 break;
1230 case Opt_tcp:
1231 mnt->flags |= NFS_MOUNT_TCP;
1232 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1233 break;
1234 case Opt_rdma:
1235 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1236 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1237 xprt_load_transport(p);
1238 break;
1239 case Opt_acl:
1240 mnt->flags &= ~NFS_MOUNT_NOACL;
1241 break;
1242 case Opt_noacl:
1243 mnt->flags |= NFS_MOUNT_NOACL;
1244 break;
1245 case Opt_rdirplus:
1246 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1247 break;
1248 case Opt_nordirplus:
1249 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1250 break;
1251 case Opt_sharecache:
1252 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1253 break;
1254 case Opt_nosharecache:
1255 mnt->flags |= NFS_MOUNT_UNSHARED;
1256 break;
1257 case Opt_resvport:
1258 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1259 break;
1260 case Opt_noresvport:
1261 mnt->flags |= NFS_MOUNT_NORESVPORT;
1262 break;
1263 case Opt_fscache:
1264 mnt->options |= NFS_OPTION_FSCACHE;
1265 kfree(mnt->fscache_uniq);
1266 mnt->fscache_uniq = NULL;
1267 break;
1268 case Opt_nofscache:
1269 mnt->options &= ~NFS_OPTION_FSCACHE;
1270 kfree(mnt->fscache_uniq);
1271 mnt->fscache_uniq = NULL;
1272 break;
1273 case Opt_migration:
1274 mnt->options |= NFS_OPTION_MIGRATION;
1275 break;
1276 case Opt_nomigration:
1277 mnt->options &= NFS_OPTION_MIGRATION;
1278 break;
1279
1280 /*
1281 * options that take numeric values
1282 */
1283 case Opt_port:
1284 if (nfs_get_option_ul(args, &option) ||
1285 option > USHRT_MAX)
1286 goto out_invalid_value;
1287 mnt->nfs_server.port = option;
1288 break;
1289 case Opt_rsize:
1290 if (nfs_get_option_ul(args, &option))
1291 goto out_invalid_value;
1292 mnt->rsize = option;
1293 break;
1294 case Opt_wsize:
1295 if (nfs_get_option_ul(args, &option))
1296 goto out_invalid_value;
1297 mnt->wsize = option;
1298 break;
1299 case Opt_bsize:
1300 if (nfs_get_option_ul(args, &option))
1301 goto out_invalid_value;
1302 mnt->bsize = option;
1303 break;
1304 case Opt_timeo:
1305 if (nfs_get_option_ul(args, &option) || option == 0)
1306 goto out_invalid_value;
1307 mnt->timeo = option;
1308 break;
1309 case Opt_retrans:
1310 if (nfs_get_option_ul(args, &option) || option == 0)
1311 goto out_invalid_value;
1312 mnt->retrans = option;
1313 break;
1314 case Opt_acregmin:
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 mnt->acregmin = option;
1318 break;
1319 case Opt_acregmax:
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->acregmax = option;
1323 break;
1324 case Opt_acdirmin:
1325 if (nfs_get_option_ul(args, &option))
1326 goto out_invalid_value;
1327 mnt->acdirmin = option;
1328 break;
1329 case Opt_acdirmax:
1330 if (nfs_get_option_ul(args, &option))
1331 goto out_invalid_value;
1332 mnt->acdirmax = option;
1333 break;
1334 case Opt_actimeo:
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->acregmin = mnt->acregmax =
1338 mnt->acdirmin = mnt->acdirmax = option;
1339 break;
1340 case Opt_namelen:
1341 if (nfs_get_option_ul(args, &option))
1342 goto out_invalid_value;
1343 mnt->namlen = option;
1344 break;
1345 case Opt_mountport:
1346 if (nfs_get_option_ul(args, &option) ||
1347 option > USHRT_MAX)
1348 goto out_invalid_value;
1349 mnt->mount_server.port = option;
1350 break;
1351 case Opt_mountvers:
1352 if (nfs_get_option_ul(args, &option) ||
1353 option < NFS_MNT_VERSION ||
1354 option > NFS_MNT3_VERSION)
1355 goto out_invalid_value;
1356 mnt->mount_server.version = option;
1357 break;
1358 case Opt_minorversion:
1359 if (nfs_get_option_ul(args, &option))
1360 goto out_invalid_value;
1361 if (option > NFS4_MAX_MINOR_VERSION)
1362 goto out_invalid_value;
1363 mnt->minorversion = option;
1364 break;
1365
1366 /*
1367 * options that take text values
1368 */
1369 case Opt_nfsvers:
1370 string = match_strdup(args);
1371 if (string == NULL)
1372 goto out_nomem;
1373 rc = nfs_parse_version_string(string, mnt, args);
1374 kfree(string);
1375 if (!rc)
1376 goto out_invalid_value;
1377 break;
1378 case Opt_sec:
1379 string = match_strdup(args);
1380 if (string == NULL)
1381 goto out_nomem;
1382 rc = nfs_parse_security_flavors(string, mnt);
1383 kfree(string);
1384 if (!rc) {
1385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "security flavor\n");
1387 return 0;
1388 }
1389 break;
1390 case Opt_proto:
1391 string = match_strdup(args);
1392 if (string == NULL)
1393 goto out_nomem;
1394 token = match_token(string,
1395 nfs_xprt_protocol_tokens, args);
1396
1397 protofamily = AF_INET;
1398 switch (token) {
1399 case Opt_xprt_udp6:
1400 protofamily = AF_INET6;
1401 case Opt_xprt_udp:
1402 mnt->flags &= ~NFS_MOUNT_TCP;
1403 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1404 break;
1405 case Opt_xprt_tcp6:
1406 protofamily = AF_INET6;
1407 case Opt_xprt_tcp:
1408 mnt->flags |= NFS_MOUNT_TCP;
1409 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1410 break;
1411 case Opt_xprt_rdma:
1412 /* vector side protocols to TCP */
1413 mnt->flags |= NFS_MOUNT_TCP;
1414 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1415 xprt_load_transport(string);
1416 break;
1417 default:
1418 dfprintk(MOUNT, "NFS: unrecognized "
1419 "transport protocol\n");
1420 kfree(string);
1421 return 0;
1422 }
1423 kfree(string);
1424 break;
1425 case Opt_mountproto:
1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
1429 token = match_token(string,
1430 nfs_xprt_protocol_tokens, args);
1431 kfree(string);
1432
1433 mountfamily = AF_INET;
1434 switch (token) {
1435 case Opt_xprt_udp6:
1436 mountfamily = AF_INET6;
1437 case Opt_xprt_udp:
1438 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1439 break;
1440 case Opt_xprt_tcp6:
1441 mountfamily = AF_INET6;
1442 case Opt_xprt_tcp:
1443 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1444 break;
1445 case Opt_xprt_rdma: /* not used for side protocols */
1446 default:
1447 dfprintk(MOUNT, "NFS: unrecognized "
1448 "transport protocol\n");
1449 return 0;
1450 }
1451 break;
1452 case Opt_addr:
1453 string = match_strdup(args);
1454 if (string == NULL)
1455 goto out_nomem;
1456 mnt->nfs_server.addrlen =
1457 rpc_pton(mnt->net, string, strlen(string),
1458 (struct sockaddr *)
1459 &mnt->nfs_server.address,
1460 sizeof(mnt->nfs_server.address));
1461 kfree(string);
1462 if (mnt->nfs_server.addrlen == 0)
1463 goto out_invalid_address;
1464 break;
1465 case Opt_clientaddr:
1466 if (nfs_get_option_str(args, &mnt->client_address))
1467 goto out_nomem;
1468 break;
1469 case Opt_mounthost:
1470 if (nfs_get_option_str(args,
1471 &mnt->mount_server.hostname))
1472 goto out_nomem;
1473 break;
1474 case Opt_mountaddr:
1475 string = match_strdup(args);
1476 if (string == NULL)
1477 goto out_nomem;
1478 mnt->mount_server.addrlen =
1479 rpc_pton(mnt->net, string, strlen(string),
1480 (struct sockaddr *)
1481 &mnt->mount_server.address,
1482 sizeof(mnt->mount_server.address));
1483 kfree(string);
1484 if (mnt->mount_server.addrlen == 0)
1485 goto out_invalid_address;
1486 break;
1487 case Opt_lookupcache:
1488 string = match_strdup(args);
1489 if (string == NULL)
1490 goto out_nomem;
1491 token = match_token(string,
1492 nfs_lookupcache_tokens, args);
1493 kfree(string);
1494 switch (token) {
1495 case Opt_lookupcache_all:
1496 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1497 break;
1498 case Opt_lookupcache_positive:
1499 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1500 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1501 break;
1502 case Opt_lookupcache_none:
1503 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1504 break;
1505 default:
1506 dfprintk(MOUNT, "NFS: invalid "
1507 "lookupcache argument\n");
1508 return 0;
1509 };
1510 break;
1511 case Opt_fscache_uniq:
1512 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1513 goto out_nomem;
1514 mnt->options |= NFS_OPTION_FSCACHE;
1515 break;
1516 case Opt_local_lock:
1517 string = match_strdup(args);
1518 if (string == NULL)
1519 goto out_nomem;
1520 token = match_token(string, nfs_local_lock_tokens,
1521 args);
1522 kfree(string);
1523 switch (token) {
1524 case Opt_local_lock_all:
1525 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1526 NFS_MOUNT_LOCAL_FCNTL);
1527 break;
1528 case Opt_local_lock_flock:
1529 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1530 break;
1531 case Opt_local_lock_posix:
1532 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1533 break;
1534 case Opt_local_lock_none:
1535 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1536 NFS_MOUNT_LOCAL_FCNTL);
1537 break;
1538 default:
1539 dfprintk(MOUNT, "NFS: invalid "
1540 "local_lock argument\n");
1541 return 0;
1542 };
1543 break;
1544
1545 /*
1546 * Special options
1547 */
1548 case Opt_sloppy:
1549 sloppy = 1;
1550 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1551 break;
1552 case Opt_userspace:
1553 case Opt_deprecated:
1554 dfprintk(MOUNT, "NFS: ignoring mount option "
1555 "'%s'\n", p);
1556 break;
1557
1558 default:
1559 invalid_option = 1;
1560 dfprintk(MOUNT, "NFS: unrecognized mount option "
1561 "'%s'\n", p);
1562 }
1563 }
1564
1565 if (!sloppy && invalid_option)
1566 return 0;
1567
1568 if (mnt->minorversion && mnt->version != 4)
1569 goto out_minorversion_mismatch;
1570
1571 if (mnt->options & NFS_OPTION_MIGRATION &&
1572 mnt->version != 4 && mnt->minorversion != 0)
1573 goto out_migration_misuse;
1574
1575 /*
1576 * verify that any proto=/mountproto= options match the address
1577 * families in the addr=/mountaddr= options.
1578 */
1579 if (protofamily != AF_UNSPEC &&
1580 protofamily != mnt->nfs_server.address.ss_family)
1581 goto out_proto_mismatch;
1582
1583 if (mountfamily != AF_UNSPEC) {
1584 if (mnt->mount_server.addrlen) {
1585 if (mountfamily != mnt->mount_server.address.ss_family)
1586 goto out_mountproto_mismatch;
1587 } else {
1588 if (mountfamily != mnt->nfs_server.address.ss_family)
1589 goto out_mountproto_mismatch;
1590 }
1591 }
1592
1593 return 1;
1594
1595 out_mountproto_mismatch:
1596 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1597 "option\n");
1598 return 0;
1599 out_proto_mismatch:
1600 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1601 return 0;
1602 out_invalid_address:
1603 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1604 return 0;
1605 out_invalid_value:
1606 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1607 return 0;
1608 out_minorversion_mismatch:
1609 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1610 "minorversion=%u\n", mnt->version, mnt->minorversion);
1611 return 0;
1612 out_migration_misuse:
1613 printk(KERN_INFO
1614 "NFS: 'migration' not supported for this NFS version\n");
1615 return 0;
1616 out_nomem:
1617 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1618 return 0;
1619 out_security_failure:
1620 free_secdata(secdata);
1621 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1622 return 0;
1623 }
1624
1625 /*
1626 * Ensure that the specified authtype in args->auth_flavors[0] is supported by
1627 * the server. Returns 0 if it's ok, and -EACCES if not.
1628 */
1629 static int nfs_verify_authflavor(struct nfs_parsed_mount_data *args,
1630 rpc_authflavor_t *server_authlist, unsigned int count)
1631 {
1632 unsigned int i;
1633
1634 /*
1635 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1636 * must be in the list returned by the server.
1637 *
1638 * AUTH_NULL has a special meaning when it's in the server list - it
1639 * means that the server will ignore the rpc creds, so any flavor
1640 * can be used.
1641 */
1642 for (i = 0; i < count; i++) {
1643 if (args->auth_flavors[0] == server_authlist[i] ||
1644 server_authlist[i] == RPC_AUTH_NULL)
1645 goto out;
1646 }
1647
1648 dfprintk(MOUNT, "NFS: auth flavor %u not supported by server\n",
1649 args->auth_flavors[0]);
1650 return -EACCES;
1651
1652 out:
1653 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1654 return 0;
1655 }
1656
1657 /*
1658 * Use the remote server's MOUNT service to request the NFS file handle
1659 * corresponding to the provided path.
1660 */
1661 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1662 struct nfs_fh *root_fh,
1663 rpc_authflavor_t *server_authlist,
1664 unsigned int *server_authlist_len)
1665 {
1666 struct nfs_mount_request request = {
1667 .sap = (struct sockaddr *)
1668 &args->mount_server.address,
1669 .dirpath = args->nfs_server.export_path,
1670 .protocol = args->mount_server.protocol,
1671 .fh = root_fh,
1672 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1673 .auth_flav_len = server_authlist_len,
1674 .auth_flavs = server_authlist,
1675 .net = args->net,
1676 };
1677 int status;
1678
1679 if (args->mount_server.version == 0) {
1680 switch (args->version) {
1681 default:
1682 args->mount_server.version = NFS_MNT3_VERSION;
1683 break;
1684 case 2:
1685 args->mount_server.version = NFS_MNT_VERSION;
1686 }
1687 }
1688 request.version = args->mount_server.version;
1689
1690 if (args->mount_server.hostname)
1691 request.hostname = args->mount_server.hostname;
1692 else
1693 request.hostname = args->nfs_server.hostname;
1694
1695 /*
1696 * Construct the mount server's address.
1697 */
1698 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1699 memcpy(request.sap, &args->nfs_server.address,
1700 args->nfs_server.addrlen);
1701 args->mount_server.addrlen = args->nfs_server.addrlen;
1702 }
1703 request.salen = args->mount_server.addrlen;
1704 nfs_set_port(request.sap, &args->mount_server.port, 0);
1705
1706 /*
1707 * Now ask the mount server to map our export path
1708 * to a file handle.
1709 */
1710 status = nfs_mount(&request);
1711 if (status != 0) {
1712 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1713 request.hostname, status);
1714 return status;
1715 }
1716
1717 return 0;
1718 }
1719
1720 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1721 struct nfs_subversion *nfs_mod)
1722 {
1723 int status;
1724 unsigned int i;
1725 bool tried_auth_unix = false;
1726 bool auth_null_in_list = false;
1727 struct nfs_server *server = ERR_PTR(-EACCES);
1728 struct nfs_parsed_mount_data *args = mount_info->parsed;
1729 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1730 unsigned int authlist_len = ARRAY_SIZE(authlist);
1731
1732 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1733 &authlist_len);
1734 if (status)
1735 return ERR_PTR(status);
1736
1737 /*
1738 * Was a sec= authflavor specified in the options? First, verify
1739 * whether the server supports it, and then just try to use it if so.
1740 */
1741 if (args->auth_flavor_len > 0) {
1742 status = nfs_verify_authflavor(args, authlist, authlist_len);
1743 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1744 if (status)
1745 return ERR_PTR(status);
1746 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1747 }
1748
1749 /*
1750 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1751 * SHOULD prefer the flavor listed first. However, some servers list
1752 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1753 */
1754 for (i = 0; i < authlist_len; ++i) {
1755 rpc_authflavor_t flavor;
1756 struct rpcsec_gss_info info;
1757
1758 flavor = authlist[i];
1759 switch (flavor) {
1760 case RPC_AUTH_UNIX:
1761 tried_auth_unix = true;
1762 break;
1763 case RPC_AUTH_NULL:
1764 auth_null_in_list = true;
1765 continue;
1766 default:
1767 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1768 continue;
1769 /* Fallthrough */
1770 }
1771 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1772 nfs_set_auth_parsed_mount_data(args, flavor);
1773 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1774 if (!IS_ERR(server))
1775 return server;
1776 }
1777
1778 /*
1779 * Nothing we tried so far worked. At this point, give up if we've
1780 * already tried AUTH_UNIX or if the server's list doesn't contain
1781 * AUTH_NULL
1782 */
1783 if (tried_auth_unix || !auth_null_in_list)
1784 return server;
1785
1786 /* Last chance! Try AUTH_UNIX */
1787 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1788 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
1789 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1790 }
1791
1792 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1793 struct nfs_mount_info *mount_info,
1794 struct nfs_subversion *nfs_mod)
1795 {
1796 struct nfs_server *server;
1797
1798 if (mount_info->parsed->need_mount)
1799 server = nfs_try_mount_request(mount_info, nfs_mod);
1800 else
1801 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1802
1803 if (IS_ERR(server))
1804 return ERR_CAST(server);
1805
1806 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1807 }
1808 EXPORT_SYMBOL_GPL(nfs_try_mount);
1809
1810 /*
1811 * Split "dev_name" into "hostname:export_path".
1812 *
1813 * The leftmost colon demarks the split between the server's hostname
1814 * and the export path. If the hostname starts with a left square
1815 * bracket, then it may contain colons.
1816 *
1817 * Note: caller frees hostname and export path, even on error.
1818 */
1819 static int nfs_parse_devname(const char *dev_name,
1820 char **hostname, size_t maxnamlen,
1821 char **export_path, size_t maxpathlen)
1822 {
1823 size_t len;
1824 char *end;
1825
1826 /* Is the host name protected with square brakcets? */
1827 if (*dev_name == '[') {
1828 end = strchr(++dev_name, ']');
1829 if (end == NULL || end[1] != ':')
1830 goto out_bad_devname;
1831
1832 len = end - dev_name;
1833 end++;
1834 } else {
1835 char *comma;
1836
1837 end = strchr(dev_name, ':');
1838 if (end == NULL)
1839 goto out_bad_devname;
1840 len = end - dev_name;
1841
1842 /* kill possible hostname list: not supported */
1843 comma = strchr(dev_name, ',');
1844 if (comma != NULL && comma < end)
1845 *comma = 0;
1846 }
1847
1848 if (len > maxnamlen)
1849 goto out_hostname;
1850
1851 /* N.B. caller will free nfs_server.hostname in all cases */
1852 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1853 if (*hostname == NULL)
1854 goto out_nomem;
1855 len = strlen(++end);
1856 if (len > maxpathlen)
1857 goto out_path;
1858 *export_path = kstrndup(end, len, GFP_KERNEL);
1859 if (!*export_path)
1860 goto out_nomem;
1861
1862 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1863 return 0;
1864
1865 out_bad_devname:
1866 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1867 return -EINVAL;
1868
1869 out_nomem:
1870 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1871 return -ENOMEM;
1872
1873 out_hostname:
1874 dfprintk(MOUNT, "NFS: server hostname too long\n");
1875 return -ENAMETOOLONG;
1876
1877 out_path:
1878 dfprintk(MOUNT, "NFS: export pathname too long\n");
1879 return -ENAMETOOLONG;
1880 }
1881
1882 /*
1883 * Validate the NFS2/NFS3 mount data
1884 * - fills in the mount root filehandle
1885 *
1886 * For option strings, user space handles the following behaviors:
1887 *
1888 * + DNS: mapping server host name to IP address ("addr=" option)
1889 *
1890 * + failure mode: how to behave if a mount request can't be handled
1891 * immediately ("fg/bg" option)
1892 *
1893 * + retry: how often to retry a mount request ("retry=" option)
1894 *
1895 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1896 * mountproto=tcp after mountproto=udp, and so on
1897 */
1898 static int nfs23_validate_mount_data(void *options,
1899 struct nfs_parsed_mount_data *args,
1900 struct nfs_fh *mntfh,
1901 const char *dev_name)
1902 {
1903 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1904 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1905 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1906
1907 if (data == NULL)
1908 goto out_no_data;
1909
1910 args->version = NFS_DEFAULT_VERSION;
1911 switch (data->version) {
1912 case 1:
1913 data->namlen = 0;
1914 case 2:
1915 data->bsize = 0;
1916 case 3:
1917 if (data->flags & NFS_MOUNT_VER3)
1918 goto out_no_v3;
1919 data->root.size = NFS2_FHSIZE;
1920 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1921 /* Turn off security negotiation */
1922 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1923 case 4:
1924 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1925 goto out_no_sec;
1926 case 5:
1927 memset(data->context, 0, sizeof(data->context));
1928 case 6:
1929 if (data->flags & NFS_MOUNT_VER3) {
1930 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1931 goto out_invalid_fh;
1932 mntfh->size = data->root.size;
1933 args->version = 3;
1934 } else {
1935 mntfh->size = NFS2_FHSIZE;
1936 args->version = 2;
1937 }
1938
1939
1940 memcpy(mntfh->data, data->root.data, mntfh->size);
1941 if (mntfh->size < sizeof(mntfh->data))
1942 memset(mntfh->data + mntfh->size, 0,
1943 sizeof(mntfh->data) - mntfh->size);
1944
1945 /*
1946 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1947 * can deal with.
1948 */
1949 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1950 args->flags |= extra_flags;
1951 args->rsize = data->rsize;
1952 args->wsize = data->wsize;
1953 args->timeo = data->timeo;
1954 args->retrans = data->retrans;
1955 args->acregmin = data->acregmin;
1956 args->acregmax = data->acregmax;
1957 args->acdirmin = data->acdirmin;
1958 args->acdirmax = data->acdirmax;
1959 args->need_mount = false;
1960
1961 memcpy(sap, &data->addr, sizeof(data->addr));
1962 args->nfs_server.addrlen = sizeof(data->addr);
1963 args->nfs_server.port = ntohs(data->addr.sin_port);
1964 if (!nfs_verify_server_address(sap))
1965 goto out_no_address;
1966
1967 if (!(data->flags & NFS_MOUNT_TCP))
1968 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1969 /* N.B. caller will free nfs_server.hostname in all cases */
1970 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1971 args->namlen = data->namlen;
1972 args->bsize = data->bsize;
1973
1974 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1975 nfs_set_auth_parsed_mount_data(args, data->pseudoflavor);
1976 else
1977 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
1978 if (!args->nfs_server.hostname)
1979 goto out_nomem;
1980
1981 if (!(data->flags & NFS_MOUNT_NONLM))
1982 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1983 NFS_MOUNT_LOCAL_FCNTL);
1984 else
1985 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1986 NFS_MOUNT_LOCAL_FCNTL);
1987 /*
1988 * The legacy version 6 binary mount data from userspace has a
1989 * field used only to transport selinux information into the
1990 * the kernel. To continue to support that functionality we
1991 * have a touch of selinux knowledge here in the NFS code. The
1992 * userspace code converted context=blah to just blah so we are
1993 * converting back to the full string selinux understands.
1994 */
1995 if (data->context[0]){
1996 #ifdef CONFIG_SECURITY_SELINUX
1997 int rc;
1998 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1999 if (!opts_str)
2000 return -ENOMEM;
2001 strcpy(opts_str, "context=");
2002 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2003 strcat(opts_str, &data->context[0]);
2004 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2005 kfree(opts_str);
2006 if (rc)
2007 return rc;
2008 #else
2009 return -EINVAL;
2010 #endif
2011 }
2012
2013 break;
2014 default:
2015 return NFS_TEXT_DATA;
2016 }
2017
2018 #if !IS_ENABLED(CONFIG_NFS_V3)
2019 if (args->version == 3)
2020 goto out_v3_not_compiled;
2021 #endif /* !CONFIG_NFS_V3 */
2022
2023 return 0;
2024
2025 out_no_data:
2026 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2027 return -EINVAL;
2028
2029 out_no_v3:
2030 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2031 data->version);
2032 return -EINVAL;
2033
2034 out_no_sec:
2035 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2036 return -EINVAL;
2037
2038 #if !IS_ENABLED(CONFIG_NFS_V3)
2039 out_v3_not_compiled:
2040 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2041 return -EPROTONOSUPPORT;
2042 #endif /* !CONFIG_NFS_V3 */
2043
2044 out_nomem:
2045 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2046 return -ENOMEM;
2047
2048 out_no_address:
2049 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2050 return -EINVAL;
2051
2052 out_invalid_fh:
2053 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2054 return -EINVAL;
2055 }
2056
2057 #if IS_ENABLED(CONFIG_NFS_V4)
2058 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2059 void *options,
2060 struct nfs_parsed_mount_data *args,
2061 struct nfs_fh *mntfh,
2062 const char *dev_name)
2063 {
2064 if (fs_type == &nfs_fs_type)
2065 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2066 return nfs4_validate_mount_data(options, args, dev_name);
2067 }
2068 #else
2069 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2070 void *options,
2071 struct nfs_parsed_mount_data *args,
2072 struct nfs_fh *mntfh,
2073 const char *dev_name)
2074 {
2075 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2076 }
2077 #endif
2078
2079 static int nfs_validate_text_mount_data(void *options,
2080 struct nfs_parsed_mount_data *args,
2081 const char *dev_name)
2082 {
2083 int port = 0;
2084 int max_namelen = PAGE_SIZE;
2085 int max_pathlen = NFS_MAXPATHLEN;
2086 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2087
2088 if (nfs_parse_mount_options((char *)options, args) == 0)
2089 return -EINVAL;
2090
2091 if (!nfs_verify_server_address(sap))
2092 goto out_no_address;
2093
2094 if (args->version == 4) {
2095 #if IS_ENABLED(CONFIG_NFS_V4)
2096 port = NFS_PORT;
2097 max_namelen = NFS4_MAXNAMLEN;
2098 max_pathlen = NFS4_MAXPATHLEN;
2099 nfs_validate_transport_protocol(args);
2100 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2101 goto out_invalid_transport_udp;
2102 nfs4_validate_mount_flags(args);
2103 #else
2104 goto out_v4_not_compiled;
2105 #endif /* CONFIG_NFS_V4 */
2106 } else
2107 nfs_set_mount_transport_protocol(args);
2108
2109 nfs_set_port(sap, &args->nfs_server.port, port);
2110
2111 if (args->auth_flavor_len > 1)
2112 goto out_bad_auth;
2113
2114 return nfs_parse_devname(dev_name,
2115 &args->nfs_server.hostname,
2116 max_namelen,
2117 &args->nfs_server.export_path,
2118 max_pathlen);
2119
2120 #if !IS_ENABLED(CONFIG_NFS_V4)
2121 out_v4_not_compiled:
2122 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2123 return -EPROTONOSUPPORT;
2124 #else
2125 out_invalid_transport_udp:
2126 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2127 return -EINVAL;
2128 #endif /* !CONFIG_NFS_V4 */
2129
2130 out_no_address:
2131 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2132 return -EINVAL;
2133
2134 out_bad_auth:
2135 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2136 return -EINVAL;
2137 }
2138
2139 static int
2140 nfs_compare_remount_data(struct nfs_server *nfss,
2141 struct nfs_parsed_mount_data *data)
2142 {
2143 if (data->flags != nfss->flags ||
2144 data->rsize != nfss->rsize ||
2145 data->wsize != nfss->wsize ||
2146 data->retrans != nfss->client->cl_timeout->to_retries ||
2147 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2148 data->acregmin != nfss->acregmin / HZ ||
2149 data->acregmax != nfss->acregmax / HZ ||
2150 data->acdirmin != nfss->acdirmin / HZ ||
2151 data->acdirmax != nfss->acdirmax / HZ ||
2152 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2153 data->nfs_server.port != nfss->port ||
2154 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2155 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2156 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2157 return -EINVAL;
2158
2159 return 0;
2160 }
2161
2162 int
2163 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2164 {
2165 int error;
2166 struct nfs_server *nfss = sb->s_fs_info;
2167 struct nfs_parsed_mount_data *data;
2168 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2169 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2170 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2171
2172 /*
2173 * Userspace mount programs that send binary options generally send
2174 * them populated with default values. We have no way to know which
2175 * ones were explicitly specified. Fall back to legacy behavior and
2176 * just return success.
2177 */
2178 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2179 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2180 options->version <= 6))))
2181 return 0;
2182
2183 data = kzalloc(sizeof(*data), GFP_KERNEL);
2184 if (data == NULL)
2185 return -ENOMEM;
2186
2187 /* fill out struct with values from existing mount */
2188 data->flags = nfss->flags;
2189 data->rsize = nfss->rsize;
2190 data->wsize = nfss->wsize;
2191 data->retrans = nfss->client->cl_timeout->to_retries;
2192 nfs_set_auth_parsed_mount_data(data, nfss->client->cl_auth->au_flavor);
2193 data->acregmin = nfss->acregmin / HZ;
2194 data->acregmax = nfss->acregmax / HZ;
2195 data->acdirmin = nfss->acdirmin / HZ;
2196 data->acdirmax = nfss->acdirmax / HZ;
2197 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2198 data->nfs_server.port = nfss->port;
2199 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2200 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2201 data->nfs_server.addrlen);
2202
2203 /* overwrite those values with any that were specified */
2204 error = nfs_parse_mount_options((char *)options, data);
2205 if (error < 0)
2206 goto out;
2207
2208 /*
2209 * noac is a special case. It implies -o sync, but that's not
2210 * necessarily reflected in the mtab options. do_remount_sb
2211 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2212 * remount options, so we have to explicitly reset it.
2213 */
2214 if (data->flags & NFS_MOUNT_NOAC)
2215 *flags |= MS_SYNCHRONOUS;
2216
2217 /* compare new mount options with old ones */
2218 error = nfs_compare_remount_data(nfss, data);
2219 out:
2220 kfree(data);
2221 return error;
2222 }
2223 EXPORT_SYMBOL_GPL(nfs_remount);
2224
2225 /*
2226 * Initialise the common bits of the superblock
2227 */
2228 inline void nfs_initialise_sb(struct super_block *sb)
2229 {
2230 struct nfs_server *server = NFS_SB(sb);
2231
2232 sb->s_magic = NFS_SUPER_MAGIC;
2233
2234 /* We probably want something more informative here */
2235 snprintf(sb->s_id, sizeof(sb->s_id),
2236 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2237
2238 if (sb->s_blocksize == 0)
2239 sb->s_blocksize = nfs_block_bits(server->wsize,
2240 &sb->s_blocksize_bits);
2241
2242 sb->s_bdi = &server->backing_dev_info;
2243
2244 nfs_super_set_maxbytes(sb, server->maxfilesize);
2245 }
2246
2247 /*
2248 * Finish setting up an NFS2/3 superblock
2249 */
2250 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2251 {
2252 struct nfs_parsed_mount_data *data = mount_info->parsed;
2253 struct nfs_server *server = NFS_SB(sb);
2254
2255 sb->s_blocksize_bits = 0;
2256 sb->s_blocksize = 0;
2257 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2258 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2259 if (data && data->bsize)
2260 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2261
2262 if (server->nfs_client->rpc_ops->version != 2) {
2263 /* The VFS shouldn't apply the umask to mode bits. We will do
2264 * so ourselves when necessary.
2265 */
2266 sb->s_flags |= MS_POSIXACL;
2267 sb->s_time_gran = 1;
2268 }
2269
2270 nfs_initialise_sb(sb);
2271 }
2272 EXPORT_SYMBOL_GPL(nfs_fill_super);
2273
2274 /*
2275 * Finish setting up a cloned NFS2/3/4 superblock
2276 */
2277 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2278 {
2279 const struct super_block *old_sb = mount_info->cloned->sb;
2280 struct nfs_server *server = NFS_SB(sb);
2281
2282 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2283 sb->s_blocksize = old_sb->s_blocksize;
2284 sb->s_maxbytes = old_sb->s_maxbytes;
2285 sb->s_xattr = old_sb->s_xattr;
2286 sb->s_op = old_sb->s_op;
2287 sb->s_time_gran = 1;
2288
2289 if (server->nfs_client->rpc_ops->version != 2) {
2290 /* The VFS shouldn't apply the umask to mode bits. We will do
2291 * so ourselves when necessary.
2292 */
2293 sb->s_flags |= MS_POSIXACL;
2294 }
2295
2296 nfs_initialise_sb(sb);
2297 }
2298
2299 #define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2300 | NFS_MOUNT_SECURE \
2301 | NFS_MOUNT_TCP \
2302 | NFS_MOUNT_VER3 \
2303 | NFS_MOUNT_KERBEROS \
2304 | NFS_MOUNT_NONLM \
2305 | NFS_MOUNT_BROKEN_SUID \
2306 | NFS_MOUNT_STRICTLOCK \
2307 | NFS_MOUNT_UNSHARED \
2308 | NFS_MOUNT_NORESVPORT \
2309 | NFS_MOUNT_LEGACY_INTERFACE)
2310
2311 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2312 {
2313 const struct nfs_server *a = s->s_fs_info;
2314 const struct rpc_clnt *clnt_a = a->client;
2315 const struct rpc_clnt *clnt_b = b->client;
2316
2317 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2318 goto Ebusy;
2319 if (a->nfs_client != b->nfs_client)
2320 goto Ebusy;
2321 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2322 goto Ebusy;
2323 if (a->wsize != b->wsize)
2324 goto Ebusy;
2325 if (a->rsize != b->rsize)
2326 goto Ebusy;
2327 if (a->acregmin != b->acregmin)
2328 goto Ebusy;
2329 if (a->acregmax != b->acregmax)
2330 goto Ebusy;
2331 if (a->acdirmin != b->acdirmin)
2332 goto Ebusy;
2333 if (a->acdirmax != b->acdirmax)
2334 goto Ebusy;
2335 if (b->flags & NFS_MOUNT_SECFLAVOUR &&
2336 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2337 goto Ebusy;
2338 return 1;
2339 Ebusy:
2340 return 0;
2341 }
2342
2343 struct nfs_sb_mountdata {
2344 struct nfs_server *server;
2345 int mntflags;
2346 };
2347
2348 static int nfs_set_super(struct super_block *s, void *data)
2349 {
2350 struct nfs_sb_mountdata *sb_mntdata = data;
2351 struct nfs_server *server = sb_mntdata->server;
2352 int ret;
2353
2354 s->s_flags = sb_mntdata->mntflags;
2355 s->s_fs_info = server;
2356 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2357 ret = set_anon_super(s, server);
2358 if (ret == 0)
2359 server->s_dev = s->s_dev;
2360 return ret;
2361 }
2362
2363 static int nfs_compare_super_address(struct nfs_server *server1,
2364 struct nfs_server *server2)
2365 {
2366 struct sockaddr *sap1, *sap2;
2367
2368 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2369 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2370
2371 if (sap1->sa_family != sap2->sa_family)
2372 return 0;
2373
2374 switch (sap1->sa_family) {
2375 case AF_INET: {
2376 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2377 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2378 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2379 return 0;
2380 if (sin1->sin_port != sin2->sin_port)
2381 return 0;
2382 break;
2383 }
2384 case AF_INET6: {
2385 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2386 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2387 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2388 return 0;
2389 if (sin1->sin6_port != sin2->sin6_port)
2390 return 0;
2391 break;
2392 }
2393 default:
2394 return 0;
2395 }
2396
2397 return 1;
2398 }
2399
2400 static int nfs_compare_super(struct super_block *sb, void *data)
2401 {
2402 struct nfs_sb_mountdata *sb_mntdata = data;
2403 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2404 int mntflags = sb_mntdata->mntflags;
2405
2406 if (!nfs_compare_super_address(old, server))
2407 return 0;
2408 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2409 if (old->flags & NFS_MOUNT_UNSHARED)
2410 return 0;
2411 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2412 return 0;
2413 return nfs_compare_mount_options(sb, server, mntflags);
2414 }
2415
2416 #ifdef CONFIG_NFS_FSCACHE
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 struct nfs_server *nfss = NFS_SB(sb);
2422 char *uniq = NULL;
2423 int ulen = 0;
2424
2425 nfss->fscache_key = NULL;
2426 nfss->fscache = NULL;
2427
2428 if (parsed) {
2429 if (!(parsed->options & NFS_OPTION_FSCACHE))
2430 return;
2431 if (parsed->fscache_uniq) {
2432 uniq = parsed->fscache_uniq;
2433 ulen = strlen(parsed->fscache_uniq);
2434 }
2435 } else if (cloned) {
2436 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2437 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2438 return;
2439 if (mnt_s->fscache_key) {
2440 uniq = mnt_s->fscache_key->key.uniquifier;
2441 ulen = mnt_s->fscache_key->key.uniq_len;
2442 };
2443 } else
2444 return;
2445
2446 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2447 }
2448 #else
2449 static void nfs_get_cache_cookie(struct super_block *sb,
2450 struct nfs_parsed_mount_data *parsed,
2451 struct nfs_clone_mount *cloned)
2452 {
2453 }
2454 #endif
2455
2456 static int nfs_bdi_register(struct nfs_server *server)
2457 {
2458 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2459 }
2460
2461 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2462 struct nfs_mount_info *mount_info)
2463 {
2464 int error;
2465 unsigned long kflags = 0, kflags_out = 0;
2466 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2467 kflags |= SECURITY_LSM_NATIVE_LABELS;
2468
2469 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2470 kflags, &kflags_out);
2471 if (error)
2472 goto err;
2473
2474 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2475 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2476 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2477 err:
2478 return error;
2479 }
2480 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2481
2482 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2483 struct nfs_mount_info *mount_info)
2484 {
2485 /* clone any lsm security options from the parent to the new sb */
2486 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2487 return -ESTALE;
2488 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2489 }
2490 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2491
2492 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2493 int flags, const char *dev_name,
2494 struct nfs_mount_info *mount_info,
2495 struct nfs_subversion *nfs_mod)
2496 {
2497 struct super_block *s;
2498 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2499 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2500 struct nfs_sb_mountdata sb_mntdata = {
2501 .mntflags = flags,
2502 .server = server,
2503 };
2504 int error;
2505
2506 if (server->flags & NFS_MOUNT_UNSHARED)
2507 compare_super = NULL;
2508
2509 /* -o noac implies -o sync */
2510 if (server->flags & NFS_MOUNT_NOAC)
2511 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2512
2513 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2514 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2515 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2516
2517 /* Get a superblock - note that we may end up sharing one that already exists */
2518 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2519 if (IS_ERR(s)) {
2520 mntroot = ERR_CAST(s);
2521 goto out_err_nosb;
2522 }
2523
2524 if (s->s_fs_info != server) {
2525 nfs_free_server(server);
2526 server = NULL;
2527 } else {
2528 error = nfs_bdi_register(server);
2529 if (error) {
2530 mntroot = ERR_PTR(error);
2531 goto error_splat_bdi;
2532 }
2533 }
2534
2535 if (!s->s_root) {
2536 /* initial superblock/root creation */
2537 mount_info->fill_super(s, mount_info);
2538 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2539 }
2540
2541 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2542 if (IS_ERR(mntroot))
2543 goto error_splat_super;
2544
2545 error = mount_info->set_security(s, mntroot, mount_info);
2546 if (error)
2547 goto error_splat_root;
2548
2549 s->s_flags |= MS_ACTIVE;
2550
2551 out:
2552 return mntroot;
2553
2554 out_err_nosb:
2555 nfs_free_server(server);
2556 goto out;
2557
2558 error_splat_root:
2559 dput(mntroot);
2560 mntroot = ERR_PTR(error);
2561 error_splat_super:
2562 if (server && !s->s_root)
2563 bdi_unregister(&server->backing_dev_info);
2564 error_splat_bdi:
2565 deactivate_locked_super(s);
2566 goto out;
2567 }
2568 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2569
2570 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2571 int flags, const char *dev_name, void *raw_data)
2572 {
2573 struct nfs_mount_info mount_info = {
2574 .fill_super = nfs_fill_super,
2575 .set_security = nfs_set_sb_security,
2576 };
2577 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2578 struct nfs_subversion *nfs_mod;
2579 int error;
2580
2581 mount_info.parsed = nfs_alloc_parsed_mount_data();
2582 mount_info.mntfh = nfs_alloc_fhandle();
2583 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2584 goto out;
2585
2586 /* Validate the mount data */
2587 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2588 if (error == NFS_TEXT_DATA)
2589 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2590 if (error < 0) {
2591 mntroot = ERR_PTR(error);
2592 goto out;
2593 }
2594
2595 nfs_mod = get_nfs_version(mount_info.parsed->version);
2596 if (IS_ERR(nfs_mod)) {
2597 mntroot = ERR_CAST(nfs_mod);
2598 goto out;
2599 }
2600
2601 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2602
2603 put_nfs_version(nfs_mod);
2604 out:
2605 nfs_free_parsed_mount_data(mount_info.parsed);
2606 nfs_free_fhandle(mount_info.mntfh);
2607 return mntroot;
2608 }
2609 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2610
2611 /*
2612 * Ensure that we unregister the bdi before kill_anon_super
2613 * releases the device name
2614 */
2615 void nfs_put_super(struct super_block *s)
2616 {
2617 struct nfs_server *server = NFS_SB(s);
2618
2619 bdi_unregister(&server->backing_dev_info);
2620 }
2621 EXPORT_SYMBOL_GPL(nfs_put_super);
2622
2623 /*
2624 * Destroy an NFS2/3 superblock
2625 */
2626 void nfs_kill_super(struct super_block *s)
2627 {
2628 struct nfs_server *server = NFS_SB(s);
2629
2630 kill_anon_super(s);
2631 nfs_fscache_release_super_cookie(s);
2632 nfs_free_server(server);
2633 }
2634 EXPORT_SYMBOL_GPL(nfs_kill_super);
2635
2636 /*
2637 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2638 */
2639 static struct dentry *
2640 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2641 const char *dev_name, void *raw_data)
2642 {
2643 struct nfs_clone_mount *data = raw_data;
2644 struct nfs_mount_info mount_info = {
2645 .fill_super = nfs_clone_super,
2646 .set_security = nfs_clone_sb_security,
2647 .cloned = data,
2648 };
2649 struct nfs_server *server;
2650 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2651 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2652
2653 dprintk("--> nfs_xdev_mount()\n");
2654
2655 mount_info.mntfh = mount_info.cloned->fh;
2656
2657 /* create a new volume representation */
2658 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2659
2660 if (IS_ERR(server))
2661 mntroot = ERR_CAST(server);
2662 else
2663 mntroot = nfs_fs_mount_common(server, flags,
2664 dev_name, &mount_info, nfs_mod);
2665
2666 dprintk("<-- nfs_xdev_mount() = %ld\n",
2667 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2668 return mntroot;
2669 }
2670
2671 #if IS_ENABLED(CONFIG_NFS_V4)
2672
2673 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2674 {
2675 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2676 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2677 }
2678
2679 /*
2680 * Validate NFSv4 mount options
2681 */
2682 static int nfs4_validate_mount_data(void *options,
2683 struct nfs_parsed_mount_data *args,
2684 const char *dev_name)
2685 {
2686 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2687 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2688 char *c;
2689
2690 if (data == NULL)
2691 goto out_no_data;
2692
2693 args->version = 4;
2694
2695 switch (data->version) {
2696 case 1:
2697 if (data->host_addrlen > sizeof(args->nfs_server.address))
2698 goto out_no_address;
2699 if (data->host_addrlen == 0)
2700 goto out_no_address;
2701 args->nfs_server.addrlen = data->host_addrlen;
2702 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2703 return -EFAULT;
2704 if (!nfs_verify_server_address(sap))
2705 goto out_no_address;
2706 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2707
2708 if (data->auth_flavourlen) {
2709 rpc_authflavor_t pseudoflavor;
2710 if (data->auth_flavourlen > 1)
2711 goto out_inval_auth;
2712 if (copy_from_user(&pseudoflavor,
2713 data->auth_flavours,
2714 sizeof(pseudoflavor)))
2715 return -EFAULT;
2716 nfs_set_auth_parsed_mount_data(args, pseudoflavor);
2717 } else
2718 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
2719
2720 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2721 if (IS_ERR(c))
2722 return PTR_ERR(c);
2723 args->nfs_server.hostname = c;
2724
2725 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2726 if (IS_ERR(c))
2727 return PTR_ERR(c);
2728 args->nfs_server.export_path = c;
2729 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2730
2731 c = strndup_user(data->client_addr.data, 16);
2732 if (IS_ERR(c))
2733 return PTR_ERR(c);
2734 args->client_address = c;
2735
2736 /*
2737 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2738 * can deal with.
2739 */
2740
2741 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2742 args->rsize = data->rsize;
2743 args->wsize = data->wsize;
2744 args->timeo = data->timeo;
2745 args->retrans = data->retrans;
2746 args->acregmin = data->acregmin;
2747 args->acregmax = data->acregmax;
2748 args->acdirmin = data->acdirmin;
2749 args->acdirmax = data->acdirmax;
2750 args->nfs_server.protocol = data->proto;
2751 nfs_validate_transport_protocol(args);
2752 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2753 goto out_invalid_transport_udp;
2754
2755 break;
2756 default:
2757 return NFS_TEXT_DATA;
2758 }
2759
2760 return 0;
2761
2762 out_no_data:
2763 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2764 return -EINVAL;
2765
2766 out_inval_auth:
2767 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2768 data->auth_flavourlen);
2769 return -EINVAL;
2770
2771 out_no_address:
2772 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2773 return -EINVAL;
2774
2775 out_invalid_transport_udp:
2776 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2777 return -EINVAL;
2778 }
2779
2780 /*
2781 * NFS v4 module parameters need to stay in the
2782 * NFS client for backwards compatibility
2783 */
2784 unsigned int nfs_callback_set_tcpport;
2785 unsigned short nfs_callback_tcpport;
2786 /* Default cache timeout is 10 minutes */
2787 unsigned int nfs_idmap_cache_timeout = 600;
2788 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2789 bool nfs4_disable_idmapping = true;
2790 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2791 unsigned short send_implementation_id = 1;
2792 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2793 bool recover_lost_locks = false;
2794
2795 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2796 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2797 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2798 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2799 EXPORT_SYMBOL_GPL(max_session_slots);
2800 EXPORT_SYMBOL_GPL(send_implementation_id);
2801 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2802 EXPORT_SYMBOL_GPL(recover_lost_locks);
2803
2804 #define NFS_CALLBACK_MAXPORTNR (65535U)
2805
2806 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2807 {
2808 unsigned long num;
2809 int ret;
2810
2811 if (!val)
2812 return -EINVAL;
2813 ret = kstrtoul(val, 0, &num);
2814 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2815 return -EINVAL;
2816 *((unsigned int *)kp->arg) = num;
2817 return 0;
2818 }
2819 static struct kernel_param_ops param_ops_portnr = {
2820 .set = param_set_portnr,
2821 .get = param_get_uint,
2822 };
2823 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2824
2825 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2826 module_param(nfs_idmap_cache_timeout, int, 0644);
2827 module_param(nfs4_disable_idmapping, bool, 0644);
2828 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2829 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2830 MODULE_PARM_DESC(nfs4_disable_idmapping,
2831 "Turn off NFSv4 idmapping when using 'sec=sys'");
2832 module_param(max_session_slots, ushort, 0644);
2833 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2834 "requests the client will negotiate");
2835 module_param(send_implementation_id, ushort, 0644);
2836 MODULE_PARM_DESC(send_implementation_id,
2837 "Send implementation ID with NFSv4.1 exchange_id");
2838 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2839
2840 module_param(recover_lost_locks, bool, 0644);
2841 MODULE_PARM_DESC(recover_lost_locks,
2842 "If the server reports that a lock might be lost, "
2843 "try to recover it risking data corruption.");
2844
2845
2846 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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