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Merge tag 'for-linus-20150216' of git://git.infradead.org/linux-mtd
[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 .statfs = nfs_statfs,
315 .evict_inode = nfs_evict_inode,
316 .umount_begin = nfs_umount_begin,
317 .show_options = nfs_show_options,
318 .show_devname = nfs_show_devname,
319 .show_path = nfs_show_path,
320 .show_stats = nfs_show_stats,
321 .remount_fs = nfs_remount,
322 };
323 EXPORT_SYMBOL_GPL(nfs_sops);
324
325 #if IS_ENABLED(CONFIG_NFS_V4)
326 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
327 static int nfs4_validate_mount_data(void *options,
328 struct nfs_parsed_mount_data *args, const char *dev_name);
329
330 struct file_system_type nfs4_fs_type = {
331 .owner = THIS_MODULE,
332 .name = "nfs4",
333 .mount = nfs_fs_mount,
334 .kill_sb = nfs_kill_super,
335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
336 };
337 MODULE_ALIAS_FS("nfs4");
338 MODULE_ALIAS("nfs4");
339 EXPORT_SYMBOL_GPL(nfs4_fs_type);
340
341 static int __init register_nfs4_fs(void)
342 {
343 return register_filesystem(&nfs4_fs_type);
344 }
345
346 static void unregister_nfs4_fs(void)
347 {
348 unregister_filesystem(&nfs4_fs_type);
349 }
350 #else
351 static int __init register_nfs4_fs(void)
352 {
353 return 0;
354 }
355
356 static void unregister_nfs4_fs(void)
357 {
358 }
359 #endif
360
361 static struct shrinker acl_shrinker = {
362 .count_objects = nfs_access_cache_count,
363 .scan_objects = nfs_access_cache_scan,
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 bool nfs_sb_active(struct super_block *sb)
408 {
409 struct nfs_server *server = NFS_SB(sb);
410
411 if (!atomic_inc_not_zero(&sb->s_active))
412 return false;
413 if (atomic_inc_return(&server->active) != 1)
414 atomic_dec(&sb->s_active);
415 return true;
416 }
417 EXPORT_SYMBOL_GPL(nfs_sb_active);
418
419 void nfs_sb_deactive(struct super_block *sb)
420 {
421 struct nfs_server *server = NFS_SB(sb);
422
423 if (atomic_dec_and_test(&server->active))
424 deactivate_super(sb);
425 }
426 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
427
428 /*
429 * Deliver file system statistics to userspace
430 */
431 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
432 {
433 struct nfs_server *server = NFS_SB(dentry->d_sb);
434 unsigned char blockbits;
435 unsigned long blockres;
436 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
437 struct nfs_fsstat res;
438 int error = -ENOMEM;
439
440 res.fattr = nfs_alloc_fattr();
441 if (res.fattr == NULL)
442 goto out_err;
443
444 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
445 if (unlikely(error == -ESTALE)) {
446 struct dentry *pd_dentry;
447
448 pd_dentry = dget_parent(dentry);
449 if (pd_dentry != NULL) {
450 nfs_zap_caches(pd_dentry->d_inode);
451 dput(pd_dentry);
452 }
453 }
454 nfs_free_fattr(res.fattr);
455 if (error < 0)
456 goto out_err;
457
458 buf->f_type = NFS_SUPER_MAGIC;
459
460 /*
461 * Current versions of glibc do not correctly handle the
462 * case where f_frsize != f_bsize. Eventually we want to
463 * report the value of wtmult in this field.
464 */
465 buf->f_frsize = dentry->d_sb->s_blocksize;
466
467 /*
468 * On most *nix systems, f_blocks, f_bfree, and f_bavail
469 * are reported in units of f_frsize. Linux hasn't had
470 * an f_frsize field in its statfs struct until recently,
471 * thus historically Linux's sys_statfs reports these
472 * fields in units of f_bsize.
473 */
474 buf->f_bsize = dentry->d_sb->s_blocksize;
475 blockbits = dentry->d_sb->s_blocksize_bits;
476 blockres = (1 << blockbits) - 1;
477 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
478 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
479 buf->f_bavail = (res.abytes + blockres) >> blockbits;
480
481 buf->f_files = res.tfiles;
482 buf->f_ffree = res.afiles;
483
484 buf->f_namelen = server->namelen;
485
486 return 0;
487
488 out_err:
489 dprintk("%s: statfs error = %d\n", __func__, -error);
490 return error;
491 }
492 EXPORT_SYMBOL_GPL(nfs_statfs);
493
494 /*
495 * Map the security flavour number to a name
496 */
497 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
498 {
499 static const struct {
500 rpc_authflavor_t flavour;
501 const char *str;
502 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
503 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
504 { RPC_AUTH_NULL, "null" },
505 { RPC_AUTH_UNIX, "sys" },
506 { RPC_AUTH_GSS_KRB5, "krb5" },
507 { RPC_AUTH_GSS_KRB5I, "krb5i" },
508 { RPC_AUTH_GSS_KRB5P, "krb5p" },
509 { RPC_AUTH_GSS_LKEY, "lkey" },
510 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
511 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
512 { RPC_AUTH_GSS_SPKM, "spkm" },
513 { RPC_AUTH_GSS_SPKMI, "spkmi" },
514 { RPC_AUTH_GSS_SPKMP, "spkmp" },
515 { UINT_MAX, "unknown" }
516 };
517 int i;
518
519 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
520 if (sec_flavours[i].flavour == flavour)
521 break;
522 }
523 return sec_flavours[i].str;
524 }
525
526 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
527 int showdefaults)
528 {
529 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
530
531 seq_printf(m, ",mountproto=");
532 switch (sap->sa_family) {
533 case AF_INET:
534 switch (nfss->mountd_protocol) {
535 case IPPROTO_UDP:
536 seq_printf(m, RPCBIND_NETID_UDP);
537 break;
538 case IPPROTO_TCP:
539 seq_printf(m, RPCBIND_NETID_TCP);
540 break;
541 default:
542 if (showdefaults)
543 seq_printf(m, "auto");
544 }
545 break;
546 case AF_INET6:
547 switch (nfss->mountd_protocol) {
548 case IPPROTO_UDP:
549 seq_printf(m, RPCBIND_NETID_UDP6);
550 break;
551 case IPPROTO_TCP:
552 seq_printf(m, RPCBIND_NETID_TCP6);
553 break;
554 default:
555 if (showdefaults)
556 seq_printf(m, "auto");
557 }
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 }
564
565 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
566 int showdefaults)
567 {
568 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
569
570 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
571 return;
572
573 switch (sap->sa_family) {
574 case AF_INET: {
575 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
576 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
577 break;
578 }
579 case AF_INET6: {
580 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
581 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
582 break;
583 }
584 default:
585 if (showdefaults)
586 seq_printf(m, ",mountaddr=unspecified");
587 }
588
589 if (nfss->mountd_version || showdefaults)
590 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
591 if ((nfss->mountd_port &&
592 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
593 showdefaults)
594 seq_printf(m, ",mountport=%u", nfss->mountd_port);
595
596 nfs_show_mountd_netid(m, nfss, showdefaults);
597 }
598
599 #if IS_ENABLED(CONFIG_NFS_V4)
600 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
601 int showdefaults)
602 {
603 struct nfs_client *clp = nfss->nfs_client;
604
605 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
606 }
607 #else
608 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
609 int showdefaults)
610 {
611 }
612 #endif
613
614 static void nfs_show_nfs_version(struct seq_file *m,
615 unsigned int version,
616 unsigned int minorversion)
617 {
618 seq_printf(m, ",vers=%u", version);
619 if (version == 4)
620 seq_printf(m, ".%u", minorversion);
621 }
622
623 /*
624 * Describe the mount options in force on this server representation
625 */
626 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
628 {
629 static const struct proc_nfs_info {
630 int flag;
631 const char *str;
632 const char *nostr;
633 } nfs_info[] = {
634 { NFS_MOUNT_SOFT, ",soft", ",hard" },
635 { NFS_MOUNT_POSIX, ",posix", "" },
636 { NFS_MOUNT_NOCTO, ",nocto", "" },
637 { NFS_MOUNT_NOAC, ",noac", "" },
638 { NFS_MOUNT_NONLM, ",nolock", "" },
639 { NFS_MOUNT_NOACL, ",noacl", "" },
640 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
641 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
642 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
643 { 0, NULL, NULL }
644 };
645 const struct proc_nfs_info *nfs_infop;
646 struct nfs_client *clp = nfss->nfs_client;
647 u32 version = clp->rpc_ops->version;
648 int local_flock, local_fcntl;
649
650 nfs_show_nfs_version(m, version, clp->cl_minorversion);
651 seq_printf(m, ",rsize=%u", nfss->rsize);
652 seq_printf(m, ",wsize=%u", nfss->wsize);
653 if (nfss->bsize != 0)
654 seq_printf(m, ",bsize=%u", nfss->bsize);
655 seq_printf(m, ",namlen=%u", nfss->namelen);
656 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
657 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
658 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
659 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
660 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
661 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
662 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
663 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
664 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
665 if (nfss->flags & nfs_infop->flag)
666 seq_puts(m, nfs_infop->str);
667 else
668 seq_puts(m, nfs_infop->nostr);
669 }
670 rcu_read_lock();
671 seq_printf(m, ",proto=%s",
672 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
673 rcu_read_unlock();
674 if (version == 4) {
675 if (nfss->port != NFS_PORT)
676 seq_printf(m, ",port=%u", nfss->port);
677 } else
678 if (nfss->port)
679 seq_printf(m, ",port=%u", nfss->port);
680
681 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
682 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
683 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
684
685 if (version != 4)
686 nfs_show_mountd_options(m, nfss, showdefaults);
687 else
688 nfs_show_nfsv4_options(m, nfss, showdefaults);
689
690 if (nfss->options & NFS_OPTION_FSCACHE)
691 seq_printf(m, ",fsc");
692
693 if (nfss->options & NFS_OPTION_MIGRATION)
694 seq_printf(m, ",migration");
695
696 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
697 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
698 seq_printf(m, ",lookupcache=none");
699 else
700 seq_printf(m, ",lookupcache=pos");
701 }
702
703 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
704 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
705
706 if (!local_flock && !local_fcntl)
707 seq_printf(m, ",local_lock=none");
708 else if (local_flock && local_fcntl)
709 seq_printf(m, ",local_lock=all");
710 else if (local_flock)
711 seq_printf(m, ",local_lock=flock");
712 else
713 seq_printf(m, ",local_lock=posix");
714 }
715
716 /*
717 * Describe the mount options on this VFS mountpoint
718 */
719 int nfs_show_options(struct seq_file *m, struct dentry *root)
720 {
721 struct nfs_server *nfss = NFS_SB(root->d_sb);
722
723 nfs_show_mount_options(m, nfss, 0);
724
725 rcu_read_lock();
726 seq_printf(m, ",addr=%s",
727 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
728 RPC_DISPLAY_ADDR));
729 rcu_read_unlock();
730
731 return 0;
732 }
733 EXPORT_SYMBOL_GPL(nfs_show_options);
734
735 #if IS_ENABLED(CONFIG_NFS_V4)
736 #ifdef CONFIG_NFS_V4_1
737 static void show_sessions(struct seq_file *m, struct nfs_server *server)
738 {
739 if (nfs4_has_session(server->nfs_client))
740 seq_printf(m, ",sessions");
741 }
742 #else
743 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
744 #endif
745 #endif
746
747 #ifdef CONFIG_NFS_V4_1
748 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
749 {
750 seq_printf(m, ",pnfs=");
751 if (server->pnfs_curr_ld)
752 seq_printf(m, "%s", server->pnfs_curr_ld->name);
753 else
754 seq_printf(m, "not configured");
755 }
756
757 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
758 {
759 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
760 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
761 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
762 "date='%llu,%u'",
763 impl_id->name, impl_id->domain,
764 impl_id->date.seconds, impl_id->date.nseconds);
765 }
766 }
767 #else
768 #if IS_ENABLED(CONFIG_NFS_V4)
769 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
770 {
771 }
772 #endif
773 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
774 {
775 }
776 #endif
777
778 int nfs_show_devname(struct seq_file *m, struct dentry *root)
779 {
780 char *page = (char *) __get_free_page(GFP_KERNEL);
781 char *devname, *dummy;
782 int err = 0;
783 if (!page)
784 return -ENOMEM;
785 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
786 if (IS_ERR(devname))
787 err = PTR_ERR(devname);
788 else
789 seq_escape(m, devname, " \t\n\\");
790 free_page((unsigned long)page);
791 return err;
792 }
793 EXPORT_SYMBOL_GPL(nfs_show_devname);
794
795 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
796 {
797 seq_puts(m, "/");
798 return 0;
799 }
800 EXPORT_SYMBOL_GPL(nfs_show_path);
801
802 /*
803 * Present statistical information for this VFS mountpoint
804 */
805 int nfs_show_stats(struct seq_file *m, struct dentry *root)
806 {
807 int i, cpu;
808 struct nfs_server *nfss = NFS_SB(root->d_sb);
809 struct rpc_auth *auth = nfss->client->cl_auth;
810 struct nfs_iostats totals = { };
811
812 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
813
814 /*
815 * Display all mount option settings
816 */
817 seq_printf(m, "\n\topts:\t");
818 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
819 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
820 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
821 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
822 nfs_show_mount_options(m, nfss, 1);
823
824 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
825
826 show_implementation_id(m, nfss);
827
828 seq_printf(m, "\n\tcaps:\t");
829 seq_printf(m, "caps=0x%x", nfss->caps);
830 seq_printf(m, ",wtmult=%u", nfss->wtmult);
831 seq_printf(m, ",dtsize=%u", nfss->dtsize);
832 seq_printf(m, ",bsize=%u", nfss->bsize);
833 seq_printf(m, ",namlen=%u", nfss->namelen);
834
835 #if IS_ENABLED(CONFIG_NFS_V4)
836 if (nfss->nfs_client->rpc_ops->version == 4) {
837 seq_printf(m, "\n\tnfsv4:\t");
838 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
839 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
840 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
841 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
842 show_sessions(m, nfss);
843 show_pnfs(m, nfss);
844 }
845 #endif
846
847 /*
848 * Display security flavor in effect for this mount
849 */
850 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
851 if (auth->au_flavor)
852 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
853
854 /*
855 * Display superblock I/O counters
856 */
857 for_each_possible_cpu(cpu) {
858 struct nfs_iostats *stats;
859
860 preempt_disable();
861 stats = per_cpu_ptr(nfss->io_stats, cpu);
862
863 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
864 totals.events[i] += stats->events[i];
865 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
866 totals.bytes[i] += stats->bytes[i];
867 #ifdef CONFIG_NFS_FSCACHE
868 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
869 totals.fscache[i] += stats->fscache[i];
870 #endif
871
872 preempt_enable();
873 }
874
875 seq_printf(m, "\n\tevents:\t");
876 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
877 seq_printf(m, "%lu ", totals.events[i]);
878 seq_printf(m, "\n\tbytes:\t");
879 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
880 seq_printf(m, "%Lu ", totals.bytes[i]);
881 #ifdef CONFIG_NFS_FSCACHE
882 if (nfss->options & NFS_OPTION_FSCACHE) {
883 seq_printf(m, "\n\tfsc:\t");
884 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
885 seq_printf(m, "%Lu ", totals.bytes[i]);
886 }
887 #endif
888 seq_printf(m, "\n");
889
890 rpc_print_iostats(m, nfss->client);
891
892 return 0;
893 }
894 EXPORT_SYMBOL_GPL(nfs_show_stats);
895
896 /*
897 * Begin unmount by attempting to remove all automounted mountpoints we added
898 * in response to xdev traversals and referrals
899 */
900 void nfs_umount_begin(struct super_block *sb)
901 {
902 struct nfs_server *server;
903 struct rpc_clnt *rpc;
904
905 server = NFS_SB(sb);
906 /* -EIO all pending I/O */
907 rpc = server->client_acl;
908 if (!IS_ERR(rpc))
909 rpc_killall_tasks(rpc);
910 rpc = server->client;
911 if (!IS_ERR(rpc))
912 rpc_killall_tasks(rpc);
913 }
914 EXPORT_SYMBOL_GPL(nfs_umount_begin);
915
916 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
917 {
918 struct nfs_parsed_mount_data *data;
919
920 data = kzalloc(sizeof(*data), GFP_KERNEL);
921 if (data) {
922 data->acregmin = NFS_DEF_ACREGMIN;
923 data->acregmax = NFS_DEF_ACREGMAX;
924 data->acdirmin = NFS_DEF_ACDIRMIN;
925 data->acdirmax = NFS_DEF_ACDIRMAX;
926 data->mount_server.port = NFS_UNSPEC_PORT;
927 data->nfs_server.port = NFS_UNSPEC_PORT;
928 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
929 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
930 data->minorversion = 0;
931 data->need_mount = true;
932 data->net = current->nsproxy->net_ns;
933 security_init_mnt_opts(&data->lsm_opts);
934 }
935 return data;
936 }
937
938 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
939 {
940 if (data) {
941 kfree(data->client_address);
942 kfree(data->mount_server.hostname);
943 kfree(data->nfs_server.export_path);
944 kfree(data->nfs_server.hostname);
945 kfree(data->fscache_uniq);
946 security_free_mnt_opts(&data->lsm_opts);
947 kfree(data);
948 }
949 }
950
951 /*
952 * Sanity-check a server address provided by the mount command.
953 *
954 * Address family must be initialized, and address must not be
955 * the ANY address for that family.
956 */
957 static int nfs_verify_server_address(struct sockaddr *addr)
958 {
959 switch (addr->sa_family) {
960 case AF_INET: {
961 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
962 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
963 }
964 case AF_INET6: {
965 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
966 return !ipv6_addr_any(sa);
967 }
968 }
969
970 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
971 return 0;
972 }
973
974 /*
975 * Select between a default port value and a user-specified port value.
976 * If a zero value is set, then autobind will be used.
977 */
978 static void nfs_set_port(struct sockaddr *sap, int *port,
979 const unsigned short default_port)
980 {
981 if (*port == NFS_UNSPEC_PORT)
982 *port = default_port;
983
984 rpc_set_port(sap, *port);
985 }
986
987 /*
988 * Sanity check the NFS transport protocol.
989 *
990 */
991 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
992 {
993 switch (mnt->nfs_server.protocol) {
994 case XPRT_TRANSPORT_UDP:
995 case XPRT_TRANSPORT_TCP:
996 case XPRT_TRANSPORT_RDMA:
997 break;
998 default:
999 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1000 }
1001 }
1002
1003 /*
1004 * For text based NFSv2/v3 mounts, the mount protocol transport default
1005 * settings should depend upon the specified NFS transport.
1006 */
1007 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1008 {
1009 nfs_validate_transport_protocol(mnt);
1010
1011 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1012 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1013 return;
1014 switch (mnt->nfs_server.protocol) {
1015 case XPRT_TRANSPORT_UDP:
1016 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1017 break;
1018 case XPRT_TRANSPORT_TCP:
1019 case XPRT_TRANSPORT_RDMA:
1020 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1021 }
1022 }
1023
1024 /*
1025 * Add 'flavor' to 'auth_info' if not already present.
1026 * Returns true if 'flavor' ends up in the list, false otherwise
1027 */
1028 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1029 rpc_authflavor_t flavor)
1030 {
1031 unsigned int i;
1032 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1033
1034 /* make sure this flavor isn't already in the list */
1035 for (i = 0; i < auth_info->flavor_len; i++) {
1036 if (flavor == auth_info->flavors[i])
1037 return true;
1038 }
1039
1040 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1041 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1042 return false;
1043 }
1044
1045 auth_info->flavors[auth_info->flavor_len++] = flavor;
1046 return true;
1047 }
1048
1049 /*
1050 * Return true if 'match' is in auth_info or auth_info is empty.
1051 * Return false otherwise.
1052 */
1053 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1054 rpc_authflavor_t match)
1055 {
1056 int i;
1057
1058 if (!auth_info->flavor_len)
1059 return true;
1060
1061 for (i = 0; i < auth_info->flavor_len; i++) {
1062 if (auth_info->flavors[i] == match)
1063 return true;
1064 }
1065 return false;
1066 }
1067 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1068
1069 /*
1070 * Parse the value of the 'sec=' option.
1071 */
1072 static int nfs_parse_security_flavors(char *value,
1073 struct nfs_parsed_mount_data *mnt)
1074 {
1075 substring_t args[MAX_OPT_ARGS];
1076 rpc_authflavor_t pseudoflavor;
1077 char *p;
1078
1079 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1080
1081 while ((p = strsep(&value, ":")) != NULL) {
1082 switch (match_token(p, nfs_secflavor_tokens, args)) {
1083 case Opt_sec_none:
1084 pseudoflavor = RPC_AUTH_NULL;
1085 break;
1086 case Opt_sec_sys:
1087 pseudoflavor = RPC_AUTH_UNIX;
1088 break;
1089 case Opt_sec_krb5:
1090 pseudoflavor = RPC_AUTH_GSS_KRB5;
1091 break;
1092 case Opt_sec_krb5i:
1093 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1094 break;
1095 case Opt_sec_krb5p:
1096 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1097 break;
1098 case Opt_sec_lkey:
1099 pseudoflavor = RPC_AUTH_GSS_LKEY;
1100 break;
1101 case Opt_sec_lkeyi:
1102 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1103 break;
1104 case Opt_sec_lkeyp:
1105 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1106 break;
1107 case Opt_sec_spkm:
1108 pseudoflavor = RPC_AUTH_GSS_SPKM;
1109 break;
1110 case Opt_sec_spkmi:
1111 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1112 break;
1113 case Opt_sec_spkmp:
1114 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1115 break;
1116 default:
1117 dfprintk(MOUNT,
1118 "NFS: sec= option '%s' not recognized\n", p);
1119 return 0;
1120 }
1121
1122 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1123 return 0;
1124 }
1125
1126 return 1;
1127 }
1128
1129 static int nfs_parse_version_string(char *string,
1130 struct nfs_parsed_mount_data *mnt,
1131 substring_t *args)
1132 {
1133 mnt->flags &= ~NFS_MOUNT_VER3;
1134 switch (match_token(string, nfs_vers_tokens, args)) {
1135 case Opt_vers_2:
1136 mnt->version = 2;
1137 break;
1138 case Opt_vers_3:
1139 mnt->flags |= NFS_MOUNT_VER3;
1140 mnt->version = 3;
1141 break;
1142 case Opt_vers_4:
1143 /* Backward compatibility option. In future,
1144 * the mount program should always supply
1145 * a NFSv4 minor version number.
1146 */
1147 mnt->version = 4;
1148 break;
1149 case Opt_vers_4_0:
1150 mnt->version = 4;
1151 mnt->minorversion = 0;
1152 break;
1153 case Opt_vers_4_1:
1154 mnt->version = 4;
1155 mnt->minorversion = 1;
1156 break;
1157 case Opt_vers_4_2:
1158 mnt->version = 4;
1159 mnt->minorversion = 2;
1160 break;
1161 default:
1162 return 0;
1163 }
1164 return 1;
1165 }
1166
1167 static int nfs_get_option_str(substring_t args[], char **option)
1168 {
1169 kfree(*option);
1170 *option = match_strdup(args);
1171 return !*option;
1172 }
1173
1174 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1175 {
1176 int rc;
1177 char *string;
1178
1179 string = match_strdup(args);
1180 if (string == NULL)
1181 return -ENOMEM;
1182 rc = kstrtoul(string, 10, option);
1183 kfree(string);
1184
1185 return rc;
1186 }
1187
1188 /*
1189 * Error-check and convert a string of mount options from user space into
1190 * a data structure. The whole mount string is processed; bad options are
1191 * skipped as they are encountered. If there were no errors, return 1;
1192 * otherwise return 0 (zero).
1193 */
1194 static int nfs_parse_mount_options(char *raw,
1195 struct nfs_parsed_mount_data *mnt)
1196 {
1197 char *p, *string, *secdata;
1198 int rc, sloppy = 0, invalid_option = 0;
1199 unsigned short protofamily = AF_UNSPEC;
1200 unsigned short mountfamily = AF_UNSPEC;
1201
1202 if (!raw) {
1203 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1204 return 1;
1205 }
1206 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1207
1208 secdata = alloc_secdata();
1209 if (!secdata)
1210 goto out_nomem;
1211
1212 rc = security_sb_copy_data(raw, secdata);
1213 if (rc)
1214 goto out_security_failure;
1215
1216 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1217 if (rc)
1218 goto out_security_failure;
1219
1220 free_secdata(secdata);
1221
1222 while ((p = strsep(&raw, ",")) != NULL) {
1223 substring_t args[MAX_OPT_ARGS];
1224 unsigned long option;
1225 int token;
1226
1227 if (!*p)
1228 continue;
1229
1230 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1231
1232 token = match_token(p, nfs_mount_option_tokens, args);
1233 switch (token) {
1234
1235 /*
1236 * boolean options: foo/nofoo
1237 */
1238 case Opt_soft:
1239 mnt->flags |= NFS_MOUNT_SOFT;
1240 break;
1241 case Opt_hard:
1242 mnt->flags &= ~NFS_MOUNT_SOFT;
1243 break;
1244 case Opt_posix:
1245 mnt->flags |= NFS_MOUNT_POSIX;
1246 break;
1247 case Opt_noposix:
1248 mnt->flags &= ~NFS_MOUNT_POSIX;
1249 break;
1250 case Opt_cto:
1251 mnt->flags &= ~NFS_MOUNT_NOCTO;
1252 break;
1253 case Opt_nocto:
1254 mnt->flags |= NFS_MOUNT_NOCTO;
1255 break;
1256 case Opt_ac:
1257 mnt->flags &= ~NFS_MOUNT_NOAC;
1258 break;
1259 case Opt_noac:
1260 mnt->flags |= NFS_MOUNT_NOAC;
1261 break;
1262 case Opt_lock:
1263 mnt->flags &= ~NFS_MOUNT_NONLM;
1264 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1265 NFS_MOUNT_LOCAL_FCNTL);
1266 break;
1267 case Opt_nolock:
1268 mnt->flags |= NFS_MOUNT_NONLM;
1269 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1270 NFS_MOUNT_LOCAL_FCNTL);
1271 break;
1272 case Opt_udp:
1273 mnt->flags &= ~NFS_MOUNT_TCP;
1274 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1275 break;
1276 case Opt_tcp:
1277 mnt->flags |= NFS_MOUNT_TCP;
1278 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1279 break;
1280 case Opt_rdma:
1281 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1282 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1283 xprt_load_transport(p);
1284 break;
1285 case Opt_acl:
1286 mnt->flags &= ~NFS_MOUNT_NOACL;
1287 break;
1288 case Opt_noacl:
1289 mnt->flags |= NFS_MOUNT_NOACL;
1290 break;
1291 case Opt_rdirplus:
1292 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1293 break;
1294 case Opt_nordirplus:
1295 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1296 break;
1297 case Opt_sharecache:
1298 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1299 break;
1300 case Opt_nosharecache:
1301 mnt->flags |= NFS_MOUNT_UNSHARED;
1302 break;
1303 case Opt_resvport:
1304 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1305 break;
1306 case Opt_noresvport:
1307 mnt->flags |= NFS_MOUNT_NORESVPORT;
1308 break;
1309 case Opt_fscache:
1310 mnt->options |= NFS_OPTION_FSCACHE;
1311 kfree(mnt->fscache_uniq);
1312 mnt->fscache_uniq = NULL;
1313 break;
1314 case Opt_nofscache:
1315 mnt->options &= ~NFS_OPTION_FSCACHE;
1316 kfree(mnt->fscache_uniq);
1317 mnt->fscache_uniq = NULL;
1318 break;
1319 case Opt_migration:
1320 mnt->options |= NFS_OPTION_MIGRATION;
1321 break;
1322 case Opt_nomigration:
1323 mnt->options &= NFS_OPTION_MIGRATION;
1324 break;
1325
1326 /*
1327 * options that take numeric values
1328 */
1329 case Opt_port:
1330 if (nfs_get_option_ul(args, &option) ||
1331 option > USHRT_MAX)
1332 goto out_invalid_value;
1333 mnt->nfs_server.port = option;
1334 break;
1335 case Opt_rsize:
1336 if (nfs_get_option_ul(args, &option))
1337 goto out_invalid_value;
1338 mnt->rsize = option;
1339 break;
1340 case Opt_wsize:
1341 if (nfs_get_option_ul(args, &option))
1342 goto out_invalid_value;
1343 mnt->wsize = option;
1344 break;
1345 case Opt_bsize:
1346 if (nfs_get_option_ul(args, &option))
1347 goto out_invalid_value;
1348 mnt->bsize = option;
1349 break;
1350 case Opt_timeo:
1351 if (nfs_get_option_ul(args, &option) || option == 0)
1352 goto out_invalid_value;
1353 mnt->timeo = option;
1354 break;
1355 case Opt_retrans:
1356 if (nfs_get_option_ul(args, &option) || option == 0)
1357 goto out_invalid_value;
1358 mnt->retrans = option;
1359 break;
1360 case Opt_acregmin:
1361 if (nfs_get_option_ul(args, &option))
1362 goto out_invalid_value;
1363 mnt->acregmin = option;
1364 break;
1365 case Opt_acregmax:
1366 if (nfs_get_option_ul(args, &option))
1367 goto out_invalid_value;
1368 mnt->acregmax = option;
1369 break;
1370 case Opt_acdirmin:
1371 if (nfs_get_option_ul(args, &option))
1372 goto out_invalid_value;
1373 mnt->acdirmin = option;
1374 break;
1375 case Opt_acdirmax:
1376 if (nfs_get_option_ul(args, &option))
1377 goto out_invalid_value;
1378 mnt->acdirmax = option;
1379 break;
1380 case Opt_actimeo:
1381 if (nfs_get_option_ul(args, &option))
1382 goto out_invalid_value;
1383 mnt->acregmin = mnt->acregmax =
1384 mnt->acdirmin = mnt->acdirmax = option;
1385 break;
1386 case Opt_namelen:
1387 if (nfs_get_option_ul(args, &option))
1388 goto out_invalid_value;
1389 mnt->namlen = option;
1390 break;
1391 case Opt_mountport:
1392 if (nfs_get_option_ul(args, &option) ||
1393 option > USHRT_MAX)
1394 goto out_invalid_value;
1395 mnt->mount_server.port = option;
1396 break;
1397 case Opt_mountvers:
1398 if (nfs_get_option_ul(args, &option) ||
1399 option < NFS_MNT_VERSION ||
1400 option > NFS_MNT3_VERSION)
1401 goto out_invalid_value;
1402 mnt->mount_server.version = option;
1403 break;
1404 case Opt_minorversion:
1405 if (nfs_get_option_ul(args, &option))
1406 goto out_invalid_value;
1407 if (option > NFS4_MAX_MINOR_VERSION)
1408 goto out_invalid_value;
1409 mnt->minorversion = option;
1410 break;
1411
1412 /*
1413 * options that take text values
1414 */
1415 case Opt_nfsvers:
1416 string = match_strdup(args);
1417 if (string == NULL)
1418 goto out_nomem;
1419 rc = nfs_parse_version_string(string, mnt, args);
1420 kfree(string);
1421 if (!rc)
1422 goto out_invalid_value;
1423 break;
1424 case Opt_sec:
1425 string = match_strdup(args);
1426 if (string == NULL)
1427 goto out_nomem;
1428 rc = nfs_parse_security_flavors(string, mnt);
1429 kfree(string);
1430 if (!rc) {
1431 dfprintk(MOUNT, "NFS: unrecognized "
1432 "security flavor\n");
1433 return 0;
1434 }
1435 break;
1436 case Opt_proto:
1437 string = match_strdup(args);
1438 if (string == NULL)
1439 goto out_nomem;
1440 token = match_token(string,
1441 nfs_xprt_protocol_tokens, args);
1442
1443 protofamily = AF_INET;
1444 switch (token) {
1445 case Opt_xprt_udp6:
1446 protofamily = AF_INET6;
1447 case Opt_xprt_udp:
1448 mnt->flags &= ~NFS_MOUNT_TCP;
1449 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1450 break;
1451 case Opt_xprt_tcp6:
1452 protofamily = AF_INET6;
1453 case Opt_xprt_tcp:
1454 mnt->flags |= NFS_MOUNT_TCP;
1455 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1456 break;
1457 case Opt_xprt_rdma:
1458 /* vector side protocols to TCP */
1459 mnt->flags |= NFS_MOUNT_TCP;
1460 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1461 xprt_load_transport(string);
1462 break;
1463 default:
1464 dfprintk(MOUNT, "NFS: unrecognized "
1465 "transport protocol\n");
1466 kfree(string);
1467 return 0;
1468 }
1469 kfree(string);
1470 break;
1471 case Opt_mountproto:
1472 string = match_strdup(args);
1473 if (string == NULL)
1474 goto out_nomem;
1475 token = match_token(string,
1476 nfs_xprt_protocol_tokens, args);
1477 kfree(string);
1478
1479 mountfamily = AF_INET;
1480 switch (token) {
1481 case Opt_xprt_udp6:
1482 mountfamily = AF_INET6;
1483 case Opt_xprt_udp:
1484 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1485 break;
1486 case Opt_xprt_tcp6:
1487 mountfamily = AF_INET6;
1488 case Opt_xprt_tcp:
1489 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1490 break;
1491 case Opt_xprt_rdma: /* not used for side protocols */
1492 default:
1493 dfprintk(MOUNT, "NFS: unrecognized "
1494 "transport protocol\n");
1495 return 0;
1496 }
1497 break;
1498 case Opt_addr:
1499 string = match_strdup(args);
1500 if (string == NULL)
1501 goto out_nomem;
1502 mnt->nfs_server.addrlen =
1503 rpc_pton(mnt->net, string, strlen(string),
1504 (struct sockaddr *)
1505 &mnt->nfs_server.address,
1506 sizeof(mnt->nfs_server.address));
1507 kfree(string);
1508 if (mnt->nfs_server.addrlen == 0)
1509 goto out_invalid_address;
1510 break;
1511 case Opt_clientaddr:
1512 if (nfs_get_option_str(args, &mnt->client_address))
1513 goto out_nomem;
1514 break;
1515 case Opt_mounthost:
1516 if (nfs_get_option_str(args,
1517 &mnt->mount_server.hostname))
1518 goto out_nomem;
1519 break;
1520 case Opt_mountaddr:
1521 string = match_strdup(args);
1522 if (string == NULL)
1523 goto out_nomem;
1524 mnt->mount_server.addrlen =
1525 rpc_pton(mnt->net, string, strlen(string),
1526 (struct sockaddr *)
1527 &mnt->mount_server.address,
1528 sizeof(mnt->mount_server.address));
1529 kfree(string);
1530 if (mnt->mount_server.addrlen == 0)
1531 goto out_invalid_address;
1532 break;
1533 case Opt_lookupcache:
1534 string = match_strdup(args);
1535 if (string == NULL)
1536 goto out_nomem;
1537 token = match_token(string,
1538 nfs_lookupcache_tokens, args);
1539 kfree(string);
1540 switch (token) {
1541 case Opt_lookupcache_all:
1542 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1543 break;
1544 case Opt_lookupcache_positive:
1545 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1546 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1547 break;
1548 case Opt_lookupcache_none:
1549 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1550 break;
1551 default:
1552 dfprintk(MOUNT, "NFS: invalid "
1553 "lookupcache argument\n");
1554 return 0;
1555 };
1556 break;
1557 case Opt_fscache_uniq:
1558 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1559 goto out_nomem;
1560 mnt->options |= NFS_OPTION_FSCACHE;
1561 break;
1562 case Opt_local_lock:
1563 string = match_strdup(args);
1564 if (string == NULL)
1565 goto out_nomem;
1566 token = match_token(string, nfs_local_lock_tokens,
1567 args);
1568 kfree(string);
1569 switch (token) {
1570 case Opt_local_lock_all:
1571 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1572 NFS_MOUNT_LOCAL_FCNTL);
1573 break;
1574 case Opt_local_lock_flock:
1575 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1576 break;
1577 case Opt_local_lock_posix:
1578 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1579 break;
1580 case Opt_local_lock_none:
1581 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1582 NFS_MOUNT_LOCAL_FCNTL);
1583 break;
1584 default:
1585 dfprintk(MOUNT, "NFS: invalid "
1586 "local_lock argument\n");
1587 return 0;
1588 };
1589 break;
1590
1591 /*
1592 * Special options
1593 */
1594 case Opt_sloppy:
1595 sloppy = 1;
1596 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1597 break;
1598 case Opt_userspace:
1599 case Opt_deprecated:
1600 dfprintk(MOUNT, "NFS: ignoring mount option "
1601 "'%s'\n", p);
1602 break;
1603
1604 default:
1605 invalid_option = 1;
1606 dfprintk(MOUNT, "NFS: unrecognized mount option "
1607 "'%s'\n", p);
1608 }
1609 }
1610
1611 if (!sloppy && invalid_option)
1612 return 0;
1613
1614 if (mnt->minorversion && mnt->version != 4)
1615 goto out_minorversion_mismatch;
1616
1617 if (mnt->options & NFS_OPTION_MIGRATION &&
1618 (mnt->version != 4 || mnt->minorversion != 0))
1619 goto out_migration_misuse;
1620
1621 /*
1622 * verify that any proto=/mountproto= options match the address
1623 * families in the addr=/mountaddr= options.
1624 */
1625 if (protofamily != AF_UNSPEC &&
1626 protofamily != mnt->nfs_server.address.ss_family)
1627 goto out_proto_mismatch;
1628
1629 if (mountfamily != AF_UNSPEC) {
1630 if (mnt->mount_server.addrlen) {
1631 if (mountfamily != mnt->mount_server.address.ss_family)
1632 goto out_mountproto_mismatch;
1633 } else {
1634 if (mountfamily != mnt->nfs_server.address.ss_family)
1635 goto out_mountproto_mismatch;
1636 }
1637 }
1638
1639 return 1;
1640
1641 out_mountproto_mismatch:
1642 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1643 "option\n");
1644 return 0;
1645 out_proto_mismatch:
1646 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1647 return 0;
1648 out_invalid_address:
1649 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1650 return 0;
1651 out_invalid_value:
1652 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1653 return 0;
1654 out_minorversion_mismatch:
1655 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1656 "minorversion=%u\n", mnt->version, mnt->minorversion);
1657 return 0;
1658 out_migration_misuse:
1659 printk(KERN_INFO
1660 "NFS: 'migration' not supported for this NFS version\n");
1661 return 0;
1662 out_nomem:
1663 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1664 return 0;
1665 out_security_failure:
1666 free_secdata(secdata);
1667 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1668 return 0;
1669 }
1670
1671 /*
1672 * Ensure that a specified authtype in args->auth_info is supported by
1673 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1674 * -EACCES if not.
1675 */
1676 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1677 rpc_authflavor_t *server_authlist, unsigned int count)
1678 {
1679 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1680 unsigned int i;
1681
1682 /*
1683 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1684 * must be in the list returned by the server.
1685 *
1686 * AUTH_NULL has a special meaning when it's in the server list - it
1687 * means that the server will ignore the rpc creds, so any flavor
1688 * can be used.
1689 */
1690 for (i = 0; i < count; i++) {
1691 flavor = server_authlist[i];
1692
1693 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1694 flavor == RPC_AUTH_NULL)
1695 goto out;
1696 }
1697
1698 dfprintk(MOUNT,
1699 "NFS: specified auth flavors not supported by server\n");
1700 return -EACCES;
1701
1702 out:
1703 args->selected_flavor = flavor;
1704 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1705 return 0;
1706 }
1707
1708 /*
1709 * Use the remote server's MOUNT service to request the NFS file handle
1710 * corresponding to the provided path.
1711 */
1712 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1713 struct nfs_fh *root_fh,
1714 rpc_authflavor_t *server_authlist,
1715 unsigned int *server_authlist_len)
1716 {
1717 struct nfs_mount_request request = {
1718 .sap = (struct sockaddr *)
1719 &args->mount_server.address,
1720 .dirpath = args->nfs_server.export_path,
1721 .protocol = args->mount_server.protocol,
1722 .fh = root_fh,
1723 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1724 .auth_flav_len = server_authlist_len,
1725 .auth_flavs = server_authlist,
1726 .net = args->net,
1727 };
1728 int status;
1729
1730 if (args->mount_server.version == 0) {
1731 switch (args->version) {
1732 default:
1733 args->mount_server.version = NFS_MNT3_VERSION;
1734 break;
1735 case 2:
1736 args->mount_server.version = NFS_MNT_VERSION;
1737 }
1738 }
1739 request.version = args->mount_server.version;
1740
1741 if (args->mount_server.hostname)
1742 request.hostname = args->mount_server.hostname;
1743 else
1744 request.hostname = args->nfs_server.hostname;
1745
1746 /*
1747 * Construct the mount server's address.
1748 */
1749 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1750 memcpy(request.sap, &args->nfs_server.address,
1751 args->nfs_server.addrlen);
1752 args->mount_server.addrlen = args->nfs_server.addrlen;
1753 }
1754 request.salen = args->mount_server.addrlen;
1755 nfs_set_port(request.sap, &args->mount_server.port, 0);
1756
1757 /*
1758 * Now ask the mount server to map our export path
1759 * to a file handle.
1760 */
1761 status = nfs_mount(&request);
1762 if (status != 0) {
1763 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1764 request.hostname, status);
1765 return status;
1766 }
1767
1768 return 0;
1769 }
1770
1771 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1772 struct nfs_subversion *nfs_mod)
1773 {
1774 int status;
1775 unsigned int i;
1776 bool tried_auth_unix = false;
1777 bool auth_null_in_list = false;
1778 struct nfs_server *server = ERR_PTR(-EACCES);
1779 struct nfs_parsed_mount_data *args = mount_info->parsed;
1780 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1781 unsigned int authlist_len = ARRAY_SIZE(authlist);
1782
1783 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1784 &authlist_len);
1785 if (status)
1786 return ERR_PTR(status);
1787
1788 /*
1789 * Was a sec= authflavor specified in the options? First, verify
1790 * whether the server supports it, and then just try to use it if so.
1791 */
1792 if (args->auth_info.flavor_len > 0) {
1793 status = nfs_verify_authflavors(args, authlist, authlist_len);
1794 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1795 args->selected_flavor);
1796 if (status)
1797 return ERR_PTR(status);
1798 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1799 }
1800
1801 /*
1802 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1803 * SHOULD prefer the flavor listed first. However, some servers list
1804 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1805 */
1806 for (i = 0; i < authlist_len; ++i) {
1807 rpc_authflavor_t flavor;
1808 struct rpcsec_gss_info info;
1809
1810 flavor = authlist[i];
1811 switch (flavor) {
1812 case RPC_AUTH_UNIX:
1813 tried_auth_unix = true;
1814 break;
1815 case RPC_AUTH_NULL:
1816 auth_null_in_list = true;
1817 continue;
1818 default:
1819 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1820 continue;
1821 /* Fallthrough */
1822 }
1823 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1824 args->selected_flavor = flavor;
1825 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1826 if (!IS_ERR(server))
1827 return server;
1828 }
1829
1830 /*
1831 * Nothing we tried so far worked. At this point, give up if we've
1832 * already tried AUTH_UNIX or if the server's list doesn't contain
1833 * AUTH_NULL
1834 */
1835 if (tried_auth_unix || !auth_null_in_list)
1836 return server;
1837
1838 /* Last chance! Try AUTH_UNIX */
1839 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1840 args->selected_flavor = RPC_AUTH_UNIX;
1841 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1842 }
1843
1844 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1845 struct nfs_mount_info *mount_info,
1846 struct nfs_subversion *nfs_mod)
1847 {
1848 struct nfs_server *server;
1849
1850 if (mount_info->parsed->need_mount)
1851 server = nfs_try_mount_request(mount_info, nfs_mod);
1852 else
1853 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1854
1855 if (IS_ERR(server))
1856 return ERR_CAST(server);
1857
1858 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1859 }
1860 EXPORT_SYMBOL_GPL(nfs_try_mount);
1861
1862 /*
1863 * Split "dev_name" into "hostname:export_path".
1864 *
1865 * The leftmost colon demarks the split between the server's hostname
1866 * and the export path. If the hostname starts with a left square
1867 * bracket, then it may contain colons.
1868 *
1869 * Note: caller frees hostname and export path, even on error.
1870 */
1871 static int nfs_parse_devname(const char *dev_name,
1872 char **hostname, size_t maxnamlen,
1873 char **export_path, size_t maxpathlen)
1874 {
1875 size_t len;
1876 char *end;
1877
1878 /* Is the host name protected with square brakcets? */
1879 if (*dev_name == '[') {
1880 end = strchr(++dev_name, ']');
1881 if (end == NULL || end[1] != ':')
1882 goto out_bad_devname;
1883
1884 len = end - dev_name;
1885 end++;
1886 } else {
1887 char *comma;
1888
1889 end = strchr(dev_name, ':');
1890 if (end == NULL)
1891 goto out_bad_devname;
1892 len = end - dev_name;
1893
1894 /* kill possible hostname list: not supported */
1895 comma = strchr(dev_name, ',');
1896 if (comma != NULL && comma < end)
1897 *comma = 0;
1898 }
1899
1900 if (len > maxnamlen)
1901 goto out_hostname;
1902
1903 /* N.B. caller will free nfs_server.hostname in all cases */
1904 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1905 if (*hostname == NULL)
1906 goto out_nomem;
1907 len = strlen(++end);
1908 if (len > maxpathlen)
1909 goto out_path;
1910 *export_path = kstrndup(end, len, GFP_KERNEL);
1911 if (!*export_path)
1912 goto out_nomem;
1913
1914 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1915 return 0;
1916
1917 out_bad_devname:
1918 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1919 return -EINVAL;
1920
1921 out_nomem:
1922 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1923 return -ENOMEM;
1924
1925 out_hostname:
1926 dfprintk(MOUNT, "NFS: server hostname too long\n");
1927 return -ENAMETOOLONG;
1928
1929 out_path:
1930 dfprintk(MOUNT, "NFS: export pathname too long\n");
1931 return -ENAMETOOLONG;
1932 }
1933
1934 /*
1935 * Validate the NFS2/NFS3 mount data
1936 * - fills in the mount root filehandle
1937 *
1938 * For option strings, user space handles the following behaviors:
1939 *
1940 * + DNS: mapping server host name to IP address ("addr=" option)
1941 *
1942 * + failure mode: how to behave if a mount request can't be handled
1943 * immediately ("fg/bg" option)
1944 *
1945 * + retry: how often to retry a mount request ("retry=" option)
1946 *
1947 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1948 * mountproto=tcp after mountproto=udp, and so on
1949 */
1950 static int nfs23_validate_mount_data(void *options,
1951 struct nfs_parsed_mount_data *args,
1952 struct nfs_fh *mntfh,
1953 const char *dev_name)
1954 {
1955 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1956 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1957 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1958
1959 if (data == NULL)
1960 goto out_no_data;
1961
1962 args->version = NFS_DEFAULT_VERSION;
1963 switch (data->version) {
1964 case 1:
1965 data->namlen = 0;
1966 case 2:
1967 data->bsize = 0;
1968 case 3:
1969 if (data->flags & NFS_MOUNT_VER3)
1970 goto out_no_v3;
1971 data->root.size = NFS2_FHSIZE;
1972 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1973 /* Turn off security negotiation */
1974 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1975 case 4:
1976 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1977 goto out_no_sec;
1978 case 5:
1979 memset(data->context, 0, sizeof(data->context));
1980 case 6:
1981 if (data->flags & NFS_MOUNT_VER3) {
1982 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1983 goto out_invalid_fh;
1984 mntfh->size = data->root.size;
1985 args->version = 3;
1986 } else {
1987 mntfh->size = NFS2_FHSIZE;
1988 args->version = 2;
1989 }
1990
1991
1992 memcpy(mntfh->data, data->root.data, mntfh->size);
1993 if (mntfh->size < sizeof(mntfh->data))
1994 memset(mntfh->data + mntfh->size, 0,
1995 sizeof(mntfh->data) - mntfh->size);
1996
1997 /*
1998 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1999 * can deal with.
2000 */
2001 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2002 args->flags |= extra_flags;
2003 args->rsize = data->rsize;
2004 args->wsize = data->wsize;
2005 args->timeo = data->timeo;
2006 args->retrans = data->retrans;
2007 args->acregmin = data->acregmin;
2008 args->acregmax = data->acregmax;
2009 args->acdirmin = data->acdirmin;
2010 args->acdirmax = data->acdirmax;
2011 args->need_mount = false;
2012
2013 memcpy(sap, &data->addr, sizeof(data->addr));
2014 args->nfs_server.addrlen = sizeof(data->addr);
2015 args->nfs_server.port = ntohs(data->addr.sin_port);
2016 if (!nfs_verify_server_address(sap))
2017 goto out_no_address;
2018
2019 if (!(data->flags & NFS_MOUNT_TCP))
2020 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2021 /* N.B. caller will free nfs_server.hostname in all cases */
2022 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2023 args->namlen = data->namlen;
2024 args->bsize = data->bsize;
2025
2026 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2027 args->selected_flavor = data->pseudoflavor;
2028 else
2029 args->selected_flavor = RPC_AUTH_UNIX;
2030 if (!args->nfs_server.hostname)
2031 goto out_nomem;
2032
2033 if (!(data->flags & NFS_MOUNT_NONLM))
2034 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2035 NFS_MOUNT_LOCAL_FCNTL);
2036 else
2037 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2038 NFS_MOUNT_LOCAL_FCNTL);
2039 /*
2040 * The legacy version 6 binary mount data from userspace has a
2041 * field used only to transport selinux information into the
2042 * the kernel. To continue to support that functionality we
2043 * have a touch of selinux knowledge here in the NFS code. The
2044 * userspace code converted context=blah to just blah so we are
2045 * converting back to the full string selinux understands.
2046 */
2047 if (data->context[0]){
2048 #ifdef CONFIG_SECURITY_SELINUX
2049 int rc;
2050 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2051 if (!opts_str)
2052 return -ENOMEM;
2053 strcpy(opts_str, "context=");
2054 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2055 strcat(opts_str, &data->context[0]);
2056 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2057 kfree(opts_str);
2058 if (rc)
2059 return rc;
2060 #else
2061 return -EINVAL;
2062 #endif
2063 }
2064
2065 break;
2066 default:
2067 return NFS_TEXT_DATA;
2068 }
2069
2070 return 0;
2071
2072 out_no_data:
2073 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2074 return -EINVAL;
2075
2076 out_no_v3:
2077 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2078 data->version);
2079 return -EINVAL;
2080
2081 out_no_sec:
2082 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2083 return -EINVAL;
2084
2085 out_nomem:
2086 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2087 return -ENOMEM;
2088
2089 out_no_address:
2090 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2091 return -EINVAL;
2092
2093 out_invalid_fh:
2094 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2095 return -EINVAL;
2096 }
2097
2098 #if IS_ENABLED(CONFIG_NFS_V4)
2099 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2100 void *options,
2101 struct nfs_parsed_mount_data *args,
2102 struct nfs_fh *mntfh,
2103 const char *dev_name)
2104 {
2105 if (fs_type == &nfs_fs_type)
2106 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2107 return nfs4_validate_mount_data(options, args, dev_name);
2108 }
2109 #else
2110 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2111 void *options,
2112 struct nfs_parsed_mount_data *args,
2113 struct nfs_fh *mntfh,
2114 const char *dev_name)
2115 {
2116 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2117 }
2118 #endif
2119
2120 static int nfs_validate_text_mount_data(void *options,
2121 struct nfs_parsed_mount_data *args,
2122 const char *dev_name)
2123 {
2124 int port = 0;
2125 int max_namelen = PAGE_SIZE;
2126 int max_pathlen = NFS_MAXPATHLEN;
2127 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2128
2129 if (nfs_parse_mount_options((char *)options, args) == 0)
2130 return -EINVAL;
2131
2132 if (!nfs_verify_server_address(sap))
2133 goto out_no_address;
2134
2135 if (args->version == 4) {
2136 #if IS_ENABLED(CONFIG_NFS_V4)
2137 port = NFS_PORT;
2138 max_namelen = NFS4_MAXNAMLEN;
2139 max_pathlen = NFS4_MAXPATHLEN;
2140 nfs_validate_transport_protocol(args);
2141 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2142 goto out_invalid_transport_udp;
2143 nfs4_validate_mount_flags(args);
2144 #else
2145 goto out_v4_not_compiled;
2146 #endif /* CONFIG_NFS_V4 */
2147 } else
2148 nfs_set_mount_transport_protocol(args);
2149
2150 nfs_set_port(sap, &args->nfs_server.port, port);
2151
2152 return nfs_parse_devname(dev_name,
2153 &args->nfs_server.hostname,
2154 max_namelen,
2155 &args->nfs_server.export_path,
2156 max_pathlen);
2157
2158 #if !IS_ENABLED(CONFIG_NFS_V4)
2159 out_v4_not_compiled:
2160 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2161 return -EPROTONOSUPPORT;
2162 #else
2163 out_invalid_transport_udp:
2164 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2165 return -EINVAL;
2166 #endif /* !CONFIG_NFS_V4 */
2167
2168 out_no_address:
2169 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2170 return -EINVAL;
2171 }
2172
2173 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2174 | NFS_MOUNT_SECURE \
2175 | NFS_MOUNT_TCP \
2176 | NFS_MOUNT_VER3 \
2177 | NFS_MOUNT_KERBEROS \
2178 | NFS_MOUNT_NONLM \
2179 | NFS_MOUNT_BROKEN_SUID \
2180 | NFS_MOUNT_STRICTLOCK \
2181 | NFS_MOUNT_LEGACY_INTERFACE)
2182
2183 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2184 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2185
2186 static int
2187 nfs_compare_remount_data(struct nfs_server *nfss,
2188 struct nfs_parsed_mount_data *data)
2189 {
2190 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2191 data->rsize != nfss->rsize ||
2192 data->wsize != nfss->wsize ||
2193 data->version != nfss->nfs_client->rpc_ops->version ||
2194 data->minorversion != nfss->nfs_client->cl_minorversion ||
2195 data->retrans != nfss->client->cl_timeout->to_retries ||
2196 data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2197 data->acregmin != nfss->acregmin / HZ ||
2198 data->acregmax != nfss->acregmax / HZ ||
2199 data->acdirmin != nfss->acdirmin / HZ ||
2200 data->acdirmax != nfss->acdirmax / HZ ||
2201 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2202 data->nfs_server.port != nfss->port ||
2203 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2204 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2205 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2206 return -EINVAL;
2207
2208 return 0;
2209 }
2210
2211 int
2212 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2213 {
2214 int error;
2215 struct nfs_server *nfss = sb->s_fs_info;
2216 struct nfs_parsed_mount_data *data;
2217 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2218 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2219 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2220
2221 sync_filesystem(sb);
2222
2223 /*
2224 * Userspace mount programs that send binary options generally send
2225 * them populated with default values. We have no way to know which
2226 * ones were explicitly specified. Fall back to legacy behavior and
2227 * just return success.
2228 */
2229 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2230 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2231 options->version <= 6))))
2232 return 0;
2233
2234 data = kzalloc(sizeof(*data), GFP_KERNEL);
2235 if (data == NULL)
2236 return -ENOMEM;
2237
2238 /* fill out struct with values from existing mount */
2239 data->flags = nfss->flags;
2240 data->rsize = nfss->rsize;
2241 data->wsize = nfss->wsize;
2242 data->retrans = nfss->client->cl_timeout->to_retries;
2243 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2244 data->auth_info = nfss->auth_info;
2245 data->acregmin = nfss->acregmin / HZ;
2246 data->acregmax = nfss->acregmax / HZ;
2247 data->acdirmin = nfss->acdirmin / HZ;
2248 data->acdirmax = nfss->acdirmax / HZ;
2249 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2250 data->nfs_server.port = nfss->port;
2251 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2252 data->version = nfsvers;
2253 data->minorversion = nfss->nfs_client->cl_minorversion;
2254 data->net = current->nsproxy->net_ns;
2255 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2256 data->nfs_server.addrlen);
2257
2258 /* overwrite those values with any that were specified */
2259 error = -EINVAL;
2260 if (!nfs_parse_mount_options((char *)options, data))
2261 goto out;
2262
2263 /*
2264 * noac is a special case. It implies -o sync, but that's not
2265 * necessarily reflected in the mtab options. do_remount_sb
2266 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2267 * remount options, so we have to explicitly reset it.
2268 */
2269 if (data->flags & NFS_MOUNT_NOAC)
2270 *flags |= MS_SYNCHRONOUS;
2271
2272 /* compare new mount options with old ones */
2273 error = nfs_compare_remount_data(nfss, data);
2274 out:
2275 kfree(data);
2276 return error;
2277 }
2278 EXPORT_SYMBOL_GPL(nfs_remount);
2279
2280 /*
2281 * Initialise the common bits of the superblock
2282 */
2283 inline void nfs_initialise_sb(struct super_block *sb)
2284 {
2285 struct nfs_server *server = NFS_SB(sb);
2286
2287 sb->s_magic = NFS_SUPER_MAGIC;
2288
2289 /* We probably want something more informative here */
2290 snprintf(sb->s_id, sizeof(sb->s_id),
2291 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2292
2293 if (sb->s_blocksize == 0)
2294 sb->s_blocksize = nfs_block_bits(server->wsize,
2295 &sb->s_blocksize_bits);
2296
2297 sb->s_bdi = &server->backing_dev_info;
2298
2299 nfs_super_set_maxbytes(sb, server->maxfilesize);
2300 }
2301
2302 /*
2303 * Finish setting up an NFS2/3 superblock
2304 */
2305 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2306 {
2307 struct nfs_parsed_mount_data *data = mount_info->parsed;
2308 struct nfs_server *server = NFS_SB(sb);
2309
2310 sb->s_blocksize_bits = 0;
2311 sb->s_blocksize = 0;
2312 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2313 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2314 if (data && data->bsize)
2315 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2316
2317 if (server->nfs_client->rpc_ops->version != 2) {
2318 /* The VFS shouldn't apply the umask to mode bits. We will do
2319 * so ourselves when necessary.
2320 */
2321 sb->s_flags |= MS_POSIXACL;
2322 sb->s_time_gran = 1;
2323 }
2324
2325 nfs_initialise_sb(sb);
2326 }
2327 EXPORT_SYMBOL_GPL(nfs_fill_super);
2328
2329 /*
2330 * Finish setting up a cloned NFS2/3/4 superblock
2331 */
2332 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2333 {
2334 const struct super_block *old_sb = mount_info->cloned->sb;
2335 struct nfs_server *server = NFS_SB(sb);
2336
2337 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2338 sb->s_blocksize = old_sb->s_blocksize;
2339 sb->s_maxbytes = old_sb->s_maxbytes;
2340 sb->s_xattr = old_sb->s_xattr;
2341 sb->s_op = old_sb->s_op;
2342 sb->s_time_gran = 1;
2343
2344 if (server->nfs_client->rpc_ops->version != 2) {
2345 /* The VFS shouldn't apply the umask to mode bits. We will do
2346 * so ourselves when necessary.
2347 */
2348 sb->s_flags |= MS_POSIXACL;
2349 }
2350
2351 nfs_initialise_sb(sb);
2352 }
2353
2354 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2355 {
2356 const struct nfs_server *a = s->s_fs_info;
2357 const struct rpc_clnt *clnt_a = a->client;
2358 const struct rpc_clnt *clnt_b = b->client;
2359
2360 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2361 goto Ebusy;
2362 if (a->nfs_client != b->nfs_client)
2363 goto Ebusy;
2364 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2365 goto Ebusy;
2366 if (a->wsize != b->wsize)
2367 goto Ebusy;
2368 if (a->rsize != b->rsize)
2369 goto Ebusy;
2370 if (a->acregmin != b->acregmin)
2371 goto Ebusy;
2372 if (a->acregmax != b->acregmax)
2373 goto Ebusy;
2374 if (a->acdirmin != b->acdirmin)
2375 goto Ebusy;
2376 if (a->acdirmax != b->acdirmax)
2377 goto Ebusy;
2378 if (b->auth_info.flavor_len > 0 &&
2379 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2380 goto Ebusy;
2381 return 1;
2382 Ebusy:
2383 return 0;
2384 }
2385
2386 struct nfs_sb_mountdata {
2387 struct nfs_server *server;
2388 int mntflags;
2389 };
2390
2391 static int nfs_set_super(struct super_block *s, void *data)
2392 {
2393 struct nfs_sb_mountdata *sb_mntdata = data;
2394 struct nfs_server *server = sb_mntdata->server;
2395 int ret;
2396
2397 s->s_flags = sb_mntdata->mntflags;
2398 s->s_fs_info = server;
2399 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2400 ret = set_anon_super(s, server);
2401 if (ret == 0)
2402 server->s_dev = s->s_dev;
2403 return ret;
2404 }
2405
2406 static int nfs_compare_super_address(struct nfs_server *server1,
2407 struct nfs_server *server2)
2408 {
2409 struct sockaddr *sap1, *sap2;
2410
2411 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2412 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2413
2414 if (sap1->sa_family != sap2->sa_family)
2415 return 0;
2416
2417 switch (sap1->sa_family) {
2418 case AF_INET: {
2419 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2420 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2421 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2422 return 0;
2423 if (sin1->sin_port != sin2->sin_port)
2424 return 0;
2425 break;
2426 }
2427 case AF_INET6: {
2428 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2429 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2430 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2431 return 0;
2432 if (sin1->sin6_port != sin2->sin6_port)
2433 return 0;
2434 break;
2435 }
2436 default:
2437 return 0;
2438 }
2439
2440 return 1;
2441 }
2442
2443 static int nfs_compare_super(struct super_block *sb, void *data)
2444 {
2445 struct nfs_sb_mountdata *sb_mntdata = data;
2446 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2447 int mntflags = sb_mntdata->mntflags;
2448
2449 if (!nfs_compare_super_address(old, server))
2450 return 0;
2451 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2452 if (old->flags & NFS_MOUNT_UNSHARED)
2453 return 0;
2454 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2455 return 0;
2456 return nfs_compare_mount_options(sb, server, mntflags);
2457 }
2458
2459 #ifdef CONFIG_NFS_FSCACHE
2460 static void nfs_get_cache_cookie(struct super_block *sb,
2461 struct nfs_parsed_mount_data *parsed,
2462 struct nfs_clone_mount *cloned)
2463 {
2464 struct nfs_server *nfss = NFS_SB(sb);
2465 char *uniq = NULL;
2466 int ulen = 0;
2467
2468 nfss->fscache_key = NULL;
2469 nfss->fscache = NULL;
2470
2471 if (parsed) {
2472 if (!(parsed->options & NFS_OPTION_FSCACHE))
2473 return;
2474 if (parsed->fscache_uniq) {
2475 uniq = parsed->fscache_uniq;
2476 ulen = strlen(parsed->fscache_uniq);
2477 }
2478 } else if (cloned) {
2479 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2480 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2481 return;
2482 if (mnt_s->fscache_key) {
2483 uniq = mnt_s->fscache_key->key.uniquifier;
2484 ulen = mnt_s->fscache_key->key.uniq_len;
2485 };
2486 } else
2487 return;
2488
2489 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2490 }
2491 #else
2492 static void nfs_get_cache_cookie(struct super_block *sb,
2493 struct nfs_parsed_mount_data *parsed,
2494 struct nfs_clone_mount *cloned)
2495 {
2496 }
2497 #endif
2498
2499 static int nfs_bdi_register(struct nfs_server *server)
2500 {
2501 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2502 }
2503
2504 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2505 struct nfs_mount_info *mount_info)
2506 {
2507 int error;
2508 unsigned long kflags = 0, kflags_out = 0;
2509 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2510 kflags |= SECURITY_LSM_NATIVE_LABELS;
2511
2512 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2513 kflags, &kflags_out);
2514 if (error)
2515 goto err;
2516
2517 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2518 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2519 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2520 err:
2521 return error;
2522 }
2523 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2524
2525 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2526 struct nfs_mount_info *mount_info)
2527 {
2528 /* clone any lsm security options from the parent to the new sb */
2529 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2530 return -ESTALE;
2531 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2532 }
2533 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2534
2535 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2536 int flags, const char *dev_name,
2537 struct nfs_mount_info *mount_info,
2538 struct nfs_subversion *nfs_mod)
2539 {
2540 struct super_block *s;
2541 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2542 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2543 struct nfs_sb_mountdata sb_mntdata = {
2544 .mntflags = flags,
2545 .server = server,
2546 };
2547 int error;
2548
2549 if (server->flags & NFS_MOUNT_UNSHARED)
2550 compare_super = NULL;
2551
2552 /* -o noac implies -o sync */
2553 if (server->flags & NFS_MOUNT_NOAC)
2554 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2555
2556 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2557 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2558 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2559
2560 /* Get a superblock - note that we may end up sharing one that already exists */
2561 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2562 if (IS_ERR(s)) {
2563 mntroot = ERR_CAST(s);
2564 goto out_err_nosb;
2565 }
2566
2567 if (s->s_fs_info != server) {
2568 nfs_free_server(server);
2569 server = NULL;
2570 } else {
2571 error = nfs_bdi_register(server);
2572 if (error) {
2573 mntroot = ERR_PTR(error);
2574 goto error_splat_super;
2575 }
2576 server->super = s;
2577 }
2578
2579 if (!s->s_root) {
2580 /* initial superblock/root creation */
2581 mount_info->fill_super(s, mount_info);
2582 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2583 }
2584
2585 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2586 if (IS_ERR(mntroot))
2587 goto error_splat_super;
2588
2589 error = mount_info->set_security(s, mntroot, mount_info);
2590 if (error)
2591 goto error_splat_root;
2592
2593 s->s_flags |= MS_ACTIVE;
2594
2595 out:
2596 return mntroot;
2597
2598 out_err_nosb:
2599 nfs_free_server(server);
2600 goto out;
2601
2602 error_splat_root:
2603 dput(mntroot);
2604 mntroot = ERR_PTR(error);
2605 error_splat_super:
2606 deactivate_locked_super(s);
2607 goto out;
2608 }
2609 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2610
2611 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2612 int flags, const char *dev_name, void *raw_data)
2613 {
2614 struct nfs_mount_info mount_info = {
2615 .fill_super = nfs_fill_super,
2616 .set_security = nfs_set_sb_security,
2617 };
2618 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2619 struct nfs_subversion *nfs_mod;
2620 int error;
2621
2622 mount_info.parsed = nfs_alloc_parsed_mount_data();
2623 mount_info.mntfh = nfs_alloc_fhandle();
2624 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2625 goto out;
2626
2627 /* Validate the mount data */
2628 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2629 if (error == NFS_TEXT_DATA)
2630 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2631 if (error < 0) {
2632 mntroot = ERR_PTR(error);
2633 goto out;
2634 }
2635
2636 nfs_mod = get_nfs_version(mount_info.parsed->version);
2637 if (IS_ERR(nfs_mod)) {
2638 mntroot = ERR_CAST(nfs_mod);
2639 goto out;
2640 }
2641
2642 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2643
2644 put_nfs_version(nfs_mod);
2645 out:
2646 nfs_free_parsed_mount_data(mount_info.parsed);
2647 nfs_free_fhandle(mount_info.mntfh);
2648 return mntroot;
2649 }
2650 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2651
2652 /*
2653 * Destroy an NFS2/3 superblock
2654 */
2655 void nfs_kill_super(struct super_block *s)
2656 {
2657 struct nfs_server *server = NFS_SB(s);
2658 dev_t dev = s->s_dev;
2659
2660 generic_shutdown_super(s);
2661
2662 nfs_fscache_release_super_cookie(s);
2663
2664 nfs_free_server(server);
2665 free_anon_bdev(dev);
2666 }
2667 EXPORT_SYMBOL_GPL(nfs_kill_super);
2668
2669 /*
2670 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2671 */
2672 static struct dentry *
2673 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2674 const char *dev_name, void *raw_data)
2675 {
2676 struct nfs_clone_mount *data = raw_data;
2677 struct nfs_mount_info mount_info = {
2678 .fill_super = nfs_clone_super,
2679 .set_security = nfs_clone_sb_security,
2680 .cloned = data,
2681 };
2682 struct nfs_server *server;
2683 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2684 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2685
2686 dprintk("--> nfs_xdev_mount()\n");
2687
2688 mount_info.mntfh = mount_info.cloned->fh;
2689
2690 /* create a new volume representation */
2691 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2692
2693 if (IS_ERR(server))
2694 mntroot = ERR_CAST(server);
2695 else
2696 mntroot = nfs_fs_mount_common(server, flags,
2697 dev_name, &mount_info, nfs_mod);
2698
2699 dprintk("<-- nfs_xdev_mount() = %ld\n",
2700 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2701 return mntroot;
2702 }
2703
2704 #if IS_ENABLED(CONFIG_NFS_V4)
2705
2706 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2707 {
2708 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2709 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2710 }
2711
2712 /*
2713 * Validate NFSv4 mount options
2714 */
2715 static int nfs4_validate_mount_data(void *options,
2716 struct nfs_parsed_mount_data *args,
2717 const char *dev_name)
2718 {
2719 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2720 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2721 char *c;
2722
2723 if (data == NULL)
2724 goto out_no_data;
2725
2726 args->version = 4;
2727
2728 switch (data->version) {
2729 case 1:
2730 if (data->host_addrlen > sizeof(args->nfs_server.address))
2731 goto out_no_address;
2732 if (data->host_addrlen == 0)
2733 goto out_no_address;
2734 args->nfs_server.addrlen = data->host_addrlen;
2735 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2736 return -EFAULT;
2737 if (!nfs_verify_server_address(sap))
2738 goto out_no_address;
2739 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2740
2741 if (data->auth_flavourlen) {
2742 rpc_authflavor_t pseudoflavor;
2743 if (data->auth_flavourlen > 1)
2744 goto out_inval_auth;
2745 if (copy_from_user(&pseudoflavor,
2746 data->auth_flavours,
2747 sizeof(pseudoflavor)))
2748 return -EFAULT;
2749 args->selected_flavor = pseudoflavor;
2750 } else
2751 args->selected_flavor = RPC_AUTH_UNIX;
2752
2753 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2754 if (IS_ERR(c))
2755 return PTR_ERR(c);
2756 args->nfs_server.hostname = c;
2757
2758 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2759 if (IS_ERR(c))
2760 return PTR_ERR(c);
2761 args->nfs_server.export_path = c;
2762 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2763
2764 c = strndup_user(data->client_addr.data, 16);
2765 if (IS_ERR(c))
2766 return PTR_ERR(c);
2767 args->client_address = c;
2768
2769 /*
2770 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2771 * can deal with.
2772 */
2773
2774 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2775 args->rsize = data->rsize;
2776 args->wsize = data->wsize;
2777 args->timeo = data->timeo;
2778 args->retrans = data->retrans;
2779 args->acregmin = data->acregmin;
2780 args->acregmax = data->acregmax;
2781 args->acdirmin = data->acdirmin;
2782 args->acdirmax = data->acdirmax;
2783 args->nfs_server.protocol = data->proto;
2784 nfs_validate_transport_protocol(args);
2785 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2786 goto out_invalid_transport_udp;
2787
2788 break;
2789 default:
2790 return NFS_TEXT_DATA;
2791 }
2792
2793 return 0;
2794
2795 out_no_data:
2796 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2797 return -EINVAL;
2798
2799 out_inval_auth:
2800 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2801 data->auth_flavourlen);
2802 return -EINVAL;
2803
2804 out_no_address:
2805 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2806 return -EINVAL;
2807
2808 out_invalid_transport_udp:
2809 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2810 return -EINVAL;
2811 }
2812
2813 /*
2814 * NFS v4 module parameters need to stay in the
2815 * NFS client for backwards compatibility
2816 */
2817 unsigned int nfs_callback_set_tcpport;
2818 unsigned short nfs_callback_tcpport;
2819 /* Default cache timeout is 10 minutes */
2820 unsigned int nfs_idmap_cache_timeout = 600;
2821 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2822 bool nfs4_disable_idmapping = true;
2823 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2824 unsigned short send_implementation_id = 1;
2825 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2826 bool recover_lost_locks = false;
2827
2828 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2829 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2830 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2831 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2832 EXPORT_SYMBOL_GPL(max_session_slots);
2833 EXPORT_SYMBOL_GPL(send_implementation_id);
2834 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2835 EXPORT_SYMBOL_GPL(recover_lost_locks);
2836
2837 #define NFS_CALLBACK_MAXPORTNR (65535U)
2838
2839 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2840 {
2841 unsigned long num;
2842 int ret;
2843
2844 if (!val)
2845 return -EINVAL;
2846 ret = kstrtoul(val, 0, &num);
2847 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2848 return -EINVAL;
2849 *((unsigned int *)kp->arg) = num;
2850 return 0;
2851 }
2852 static struct kernel_param_ops param_ops_portnr = {
2853 .set = param_set_portnr,
2854 .get = param_get_uint,
2855 };
2856 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2857
2858 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2859 module_param(nfs_idmap_cache_timeout, int, 0644);
2860 module_param(nfs4_disable_idmapping, bool, 0644);
2861 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2862 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2863 MODULE_PARM_DESC(nfs4_disable_idmapping,
2864 "Turn off NFSv4 idmapping when using 'sec=sys'");
2865 module_param(max_session_slots, ushort, 0644);
2866 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2867 "requests the client will negotiate");
2868 module_param(send_implementation_id, ushort, 0644);
2869 MODULE_PARM_DESC(send_implementation_id,
2870 "Send implementation ID with NFSv4.1 exchange_id");
2871 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2872
2873 module_param(recover_lost_locks, bool, 0644);
2874 MODULE_PARM_DESC(recover_lost_locks,
2875 "If the server reports that a lock might be lost, "
2876 "try to recover it risking data corruption.");
2877
2878
2879 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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