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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blobc25cadf8f8c4a5d58bf02bce527939c7875e5474
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57 #include <linux/kthread.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,
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
284 { Opt_vers_err, NULL }
285 };
286
287 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data);
289
290 struct file_system_type nfs_fs_type = {
291 .owner = THIS_MODULE,
292 .name = "nfs",
293 .mount = nfs_fs_mount,
294 .kill_sb = nfs_kill_super,
295 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
296 };
297 EXPORT_SYMBOL_GPL(nfs_fs_type);
298
299 struct file_system_type nfs_xdev_fs_type = {
300 .owner = THIS_MODULE,
301 .name = "nfs",
302 .mount = nfs_xdev_mount,
303 .kill_sb = nfs_kill_super,
304 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
305 };
306
307 const struct super_operations nfs_sops = {
308 .alloc_inode = nfs_alloc_inode,
309 .destroy_inode = nfs_destroy_inode,
310 .write_inode = nfs_write_inode,
311 .drop_inode = nfs_drop_inode,
312 .put_super = nfs_put_super,
313 .statfs = nfs_statfs,
314 .evict_inode = nfs_evict_inode,
315 .umount_begin = nfs_umount_begin,
316 .show_options = nfs_show_options,
317 .show_devname = nfs_show_devname,
318 .show_path = nfs_show_path,
319 .show_stats = nfs_show_stats,
320 .remount_fs = nfs_remount,
321 };
322 EXPORT_SYMBOL_GPL(nfs_sops);
323
324 #if IS_ENABLED(CONFIG_NFS_V4)
325 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
326 static int nfs4_validate_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
328
329 struct file_system_type nfs4_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .mount = nfs_fs_mount,
333 .kill_sb = nfs_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
335 };
336 EXPORT_SYMBOL_GPL(nfs4_fs_type);
337
338 static int __init register_nfs4_fs(void)
339 {
340 return register_filesystem(&nfs4_fs_type);
341 }
342
343 static void unregister_nfs4_fs(void)
344 {
345 unregister_filesystem(&nfs4_fs_type);
346 }
347 #else
348 static int __init register_nfs4_fs(void)
349 {
350 return 0;
351 }
352
353 static void unregister_nfs4_fs(void)
354 {
355 }
356 #endif
357
358 static struct shrinker acl_shrinker = {
359 .shrink = nfs_access_cache_shrinker,
360 .seeks = DEFAULT_SEEKS,
361 };
362
363 /*
364 * Register the NFS filesystems
365 */
366 int __init register_nfs_fs(void)
367 {
368 int ret;
369
370 ret = register_filesystem(&nfs_fs_type);
371 if (ret < 0)
372 goto error_0;
373
374 ret = register_nfs4_fs();
375 if (ret < 0)
376 goto error_1;
377
378 ret = nfs_register_sysctl();
379 if (ret < 0)
380 goto error_2;
381 register_shrinker(&acl_shrinker);
382 return 0;
383
384 error_2:
385 unregister_nfs4_fs();
386 error_1:
387 unregister_filesystem(&nfs_fs_type);
388 error_0:
389 return ret;
390 }
391
392 /*
393 * Unregister the NFS filesystems
394 */
395 void __exit unregister_nfs_fs(void)
396 {
397 unregister_shrinker(&acl_shrinker);
398 nfs_unregister_sysctl();
399 unregister_nfs4_fs();
400 unregister_filesystem(&nfs_fs_type);
401 }
402
403 void nfs_sb_active(struct super_block *sb)
404 {
405 struct nfs_server *server = NFS_SB(sb);
406
407 if (atomic_inc_return(&server->active) == 1)
408 atomic_inc(&sb->s_active);
409 }
410 EXPORT_SYMBOL_GPL(nfs_sb_active);
411
412 void nfs_sb_deactive(struct super_block *sb)
413 {
414 struct nfs_server *server = NFS_SB(sb);
415
416 if (atomic_dec_and_test(&server->active))
417 deactivate_super(sb);
418 }
419 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
420
421 static int nfs_deactivate_super_async_work(void *ptr)
422 {
423 struct super_block *sb = ptr;
424
425 deactivate_super(sb);
426 module_put_and_exit(0);
427 return 0;
428 }
429
430 /*
431 * same effect as deactivate_super, but will do final unmount in kthread
432 * context
433 */
434 static void nfs_deactivate_super_async(struct super_block *sb)
435 {
436 struct task_struct *task;
437 char buf[INET6_ADDRSTRLEN + 1];
438 struct nfs_server *server = NFS_SB(sb);
439 struct nfs_client *clp = server->nfs_client;
440
441 if (!atomic_add_unless(&sb->s_active, -1, 1)) {
442 rcu_read_lock();
443 snprintf(buf, sizeof(buf),
444 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
445 rcu_read_unlock();
446
447 __module_get(THIS_MODULE);
448 task = kthread_run(nfs_deactivate_super_async_work, sb,
449 "%s-deactivate-super", buf);
450 if (IS_ERR(task)) {
451 pr_err("%s: kthread_run: %ld\n",
452 __func__, PTR_ERR(task));
453 /* make synchronous call and hope for the best */
454 deactivate_super(sb);
455 module_put(THIS_MODULE);
456 }
457 }
458 }
459
460 void nfs_sb_deactive_async(struct super_block *sb)
461 {
462 struct nfs_server *server = NFS_SB(sb);
463
464 if (atomic_dec_and_test(&server->active))
465 nfs_deactivate_super_async(sb);
466 }
467 EXPORT_SYMBOL_GPL(nfs_sb_deactive_async);
468
469 /*
470 * Deliver file system statistics to userspace
471 */
472 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
473 {
474 struct nfs_server *server = NFS_SB(dentry->d_sb);
475 unsigned char blockbits;
476 unsigned long blockres;
477 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
478 struct nfs_fsstat res;
479 int error = -ENOMEM;
480
481 res.fattr = nfs_alloc_fattr();
482 if (res.fattr == NULL)
483 goto out_err;
484
485 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
486 if (unlikely(error == -ESTALE)) {
487 struct dentry *pd_dentry;
488
489 pd_dentry = dget_parent(dentry);
490 if (pd_dentry != NULL) {
491 nfs_zap_caches(pd_dentry->d_inode);
492 dput(pd_dentry);
493 }
494 }
495 nfs_free_fattr(res.fattr);
496 if (error < 0)
497 goto out_err;
498
499 buf->f_type = NFS_SUPER_MAGIC;
500
501 /*
502 * Current versions of glibc do not correctly handle the
503 * case where f_frsize != f_bsize. Eventually we want to
504 * report the value of wtmult in this field.
505 */
506 buf->f_frsize = dentry->d_sb->s_blocksize;
507
508 /*
509 * On most *nix systems, f_blocks, f_bfree, and f_bavail
510 * are reported in units of f_frsize. Linux hasn't had
511 * an f_frsize field in its statfs struct until recently,
512 * thus historically Linux's sys_statfs reports these
513 * fields in units of f_bsize.
514 */
515 buf->f_bsize = dentry->d_sb->s_blocksize;
516 blockbits = dentry->d_sb->s_blocksize_bits;
517 blockres = (1 << blockbits) - 1;
518 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
519 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
520 buf->f_bavail = (res.abytes + blockres) >> blockbits;
521
522 buf->f_files = res.tfiles;
523 buf->f_ffree = res.afiles;
524
525 buf->f_namelen = server->namelen;
526
527 return 0;
528
529 out_err:
530 dprintk("%s: statfs error = %d\n", __func__, -error);
531 return error;
532 }
533 EXPORT_SYMBOL_GPL(nfs_statfs);
534
535 /*
536 * Map the security flavour number to a name
537 */
538 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
539 {
540 static const struct {
541 rpc_authflavor_t flavour;
542 const char *str;
543 } sec_flavours[] = {
544 { RPC_AUTH_NULL, "null" },
545 { RPC_AUTH_UNIX, "sys" },
546 { RPC_AUTH_GSS_KRB5, "krb5" },
547 { RPC_AUTH_GSS_KRB5I, "krb5i" },
548 { RPC_AUTH_GSS_KRB5P, "krb5p" },
549 { RPC_AUTH_GSS_LKEY, "lkey" },
550 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
551 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
552 { RPC_AUTH_GSS_SPKM, "spkm" },
553 { RPC_AUTH_GSS_SPKMI, "spkmi" },
554 { RPC_AUTH_GSS_SPKMP, "spkmp" },
555 { UINT_MAX, "unknown" }
556 };
557 int i;
558
559 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
560 if (sec_flavours[i].flavour == flavour)
561 break;
562 }
563 return sec_flavours[i].str;
564 }
565
566 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
567 int showdefaults)
568 {
569 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
570
571 seq_printf(m, ",mountproto=");
572 switch (sap->sa_family) {
573 case AF_INET:
574 switch (nfss->mountd_protocol) {
575 case IPPROTO_UDP:
576 seq_printf(m, RPCBIND_NETID_UDP);
577 break;
578 case IPPROTO_TCP:
579 seq_printf(m, RPCBIND_NETID_TCP);
580 break;
581 default:
582 if (showdefaults)
583 seq_printf(m, "auto");
584 }
585 break;
586 case AF_INET6:
587 switch (nfss->mountd_protocol) {
588 case IPPROTO_UDP:
589 seq_printf(m, RPCBIND_NETID_UDP6);
590 break;
591 case IPPROTO_TCP:
592 seq_printf(m, RPCBIND_NETID_TCP6);
593 break;
594 default:
595 if (showdefaults)
596 seq_printf(m, "auto");
597 }
598 break;
599 default:
600 if (showdefaults)
601 seq_printf(m, "auto");
602 }
603 }
604
605 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
606 int showdefaults)
607 {
608 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
609
610 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
611 return;
612
613 switch (sap->sa_family) {
614 case AF_INET: {
615 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
616 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
617 break;
618 }
619 case AF_INET6: {
620 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
621 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
622 break;
623 }
624 default:
625 if (showdefaults)
626 seq_printf(m, ",mountaddr=unspecified");
627 }
628
629 if (nfss->mountd_version || showdefaults)
630 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
631 if ((nfss->mountd_port &&
632 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
633 showdefaults)
634 seq_printf(m, ",mountport=%u", nfss->mountd_port);
635
636 nfs_show_mountd_netid(m, nfss, showdefaults);
637 }
638
639 #if IS_ENABLED(CONFIG_NFS_V4)
640 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
641 int showdefaults)
642 {
643 struct nfs_client *clp = nfss->nfs_client;
644
645 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
646 }
647 #else
648 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
649 int showdefaults)
650 {
651 }
652 #endif
653
654 static void nfs_show_nfs_version(struct seq_file *m,
655 unsigned int version,
656 unsigned int minorversion)
657 {
658 seq_printf(m, ",vers=%u", version);
659 if (version == 4)
660 seq_printf(m, ".%u", minorversion);
661 }
662
663 /*
664 * Describe the mount options in force on this server representation
665 */
666 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
667 int showdefaults)
668 {
669 static const struct proc_nfs_info {
670 int flag;
671 const char *str;
672 const char *nostr;
673 } nfs_info[] = {
674 { NFS_MOUNT_SOFT, ",soft", ",hard" },
675 { NFS_MOUNT_POSIX, ",posix", "" },
676 { NFS_MOUNT_NOCTO, ",nocto", "" },
677 { NFS_MOUNT_NOAC, ",noac", "" },
678 { NFS_MOUNT_NONLM, ",nolock", "" },
679 { NFS_MOUNT_NOACL, ",noacl", "" },
680 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
681 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
682 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
683 { 0, NULL, NULL }
684 };
685 const struct proc_nfs_info *nfs_infop;
686 struct nfs_client *clp = nfss->nfs_client;
687 u32 version = clp->rpc_ops->version;
688 int local_flock, local_fcntl;
689
690 nfs_show_nfs_version(m, version, clp->cl_minorversion);
691 seq_printf(m, ",rsize=%u", nfss->rsize);
692 seq_printf(m, ",wsize=%u", nfss->wsize);
693 if (nfss->bsize != 0)
694 seq_printf(m, ",bsize=%u", nfss->bsize);
695 seq_printf(m, ",namlen=%u", nfss->namelen);
696 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
697 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
698 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
699 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
700 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
701 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
702 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
703 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
704 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
705 if (nfss->flags & nfs_infop->flag)
706 seq_puts(m, nfs_infop->str);
707 else
708 seq_puts(m, nfs_infop->nostr);
709 }
710 rcu_read_lock();
711 seq_printf(m, ",proto=%s",
712 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
713 rcu_read_unlock();
714 if (version == 4) {
715 if (nfss->port != NFS_PORT)
716 seq_printf(m, ",port=%u", nfss->port);
717 } else
718 if (nfss->port)
719 seq_printf(m, ",port=%u", nfss->port);
720
721 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
722 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
723 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
724
725 if (version != 4)
726 nfs_show_mountd_options(m, nfss, showdefaults);
727 else
728 nfs_show_nfsv4_options(m, nfss, showdefaults);
729
730 if (nfss->options & NFS_OPTION_FSCACHE)
731 seq_printf(m, ",fsc");
732
733 if (nfss->options & NFS_OPTION_MIGRATION)
734 seq_printf(m, ",migration");
735
736 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
738 seq_printf(m, ",lookupcache=none");
739 else
740 seq_printf(m, ",lookupcache=pos");
741 }
742
743 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
744 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
745
746 if (!local_flock && !local_fcntl)
747 seq_printf(m, ",local_lock=none");
748 else if (local_flock && local_fcntl)
749 seq_printf(m, ",local_lock=all");
750 else if (local_flock)
751 seq_printf(m, ",local_lock=flock");
752 else
753 seq_printf(m, ",local_lock=posix");
754 }
755
756 /*
757 * Describe the mount options on this VFS mountpoint
758 */
759 int nfs_show_options(struct seq_file *m, struct dentry *root)
760 {
761 struct nfs_server *nfss = NFS_SB(root->d_sb);
762
763 nfs_show_mount_options(m, nfss, 0);
764
765 rcu_read_lock();
766 seq_printf(m, ",addr=%s",
767 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
768 RPC_DISPLAY_ADDR));
769 rcu_read_unlock();
770
771 return 0;
772 }
773 EXPORT_SYMBOL_GPL(nfs_show_options);
774
775 #if IS_ENABLED(CONFIG_NFS_V4)
776 #ifdef CONFIG_NFS_V4_1
777 static void show_sessions(struct seq_file *m, struct nfs_server *server)
778 {
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781 }
782 #else
783 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784 #endif
785 #endif
786
787 #ifdef CONFIG_NFS_V4_1
788 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
789 {
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795 }
796
797 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798 {
799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806 }
807 #else
808 #if IS_ENABLED(CONFIG_NFS_V4)
809 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810 {
811 }
812 #endif
813 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814 {
815 }
816 #endif
817
818 int nfs_show_devname(struct seq_file *m, struct dentry *root)
819 {
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
825 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832 }
833 EXPORT_SYMBOL_GPL(nfs_show_devname);
834
835 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
836 {
837 seq_puts(m, "/");
838 return 0;
839 }
840 EXPORT_SYMBOL_GPL(nfs_show_path);
841
842 /*
843 * Present statistical information for this VFS mountpoint
844 */
845 int nfs_show_stats(struct seq_file *m, struct dentry *root)
846 {
847 int i, cpu;
848 struct nfs_server *nfss = NFS_SB(root->d_sb);
849 struct rpc_auth *auth = nfss->client->cl_auth;
850 struct nfs_iostats totals = { };
851
852 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
853
854 /*
855 * Display all mount option settings
856 */
857 seq_printf(m, "\n\topts:\t");
858 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
859 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
860 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
861 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
862 nfs_show_mount_options(m, nfss, 1);
863
864 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
865
866 show_implementation_id(m, nfss);
867
868 seq_printf(m, "\n\tcaps:\t");
869 seq_printf(m, "caps=0x%x", nfss->caps);
870 seq_printf(m, ",wtmult=%u", nfss->wtmult);
871 seq_printf(m, ",dtsize=%u", nfss->dtsize);
872 seq_printf(m, ",bsize=%u", nfss->bsize);
873 seq_printf(m, ",namlen=%u", nfss->namelen);
874
875 #if IS_ENABLED(CONFIG_NFS_V4)
876 if (nfss->nfs_client->rpc_ops->version == 4) {
877 seq_printf(m, "\n\tnfsv4:\t");
878 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
879 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
880 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
881 show_sessions(m, nfss);
882 show_pnfs(m, nfss);
883 }
884 #endif
885
886 /*
887 * Display security flavor in effect for this mount
888 */
889 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
890 if (auth->au_flavor)
891 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
892
893 /*
894 * Display superblock I/O counters
895 */
896 for_each_possible_cpu(cpu) {
897 struct nfs_iostats *stats;
898
899 preempt_disable();
900 stats = per_cpu_ptr(nfss->io_stats, cpu);
901
902 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
903 totals.events[i] += stats->events[i];
904 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
905 totals.bytes[i] += stats->bytes[i];
906 #ifdef CONFIG_NFS_FSCACHE
907 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
908 totals.fscache[i] += stats->fscache[i];
909 #endif
910
911 preempt_enable();
912 }
913
914 seq_printf(m, "\n\tevents:\t");
915 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
916 seq_printf(m, "%lu ", totals.events[i]);
917 seq_printf(m, "\n\tbytes:\t");
918 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
919 seq_printf(m, "%Lu ", totals.bytes[i]);
920 #ifdef CONFIG_NFS_FSCACHE
921 if (nfss->options & NFS_OPTION_FSCACHE) {
922 seq_printf(m, "\n\tfsc:\t");
923 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
924 seq_printf(m, "%Lu ", totals.bytes[i]);
925 }
926 #endif
927 seq_printf(m, "\n");
928
929 rpc_print_iostats(m, nfss->client);
930
931 return 0;
932 }
933 EXPORT_SYMBOL_GPL(nfs_show_stats);
934
935 /*
936 * Begin unmount by attempting to remove all automounted mountpoints we added
937 * in response to xdev traversals and referrals
938 */
939 void nfs_umount_begin(struct super_block *sb)
940 {
941 struct nfs_server *server;
942 struct rpc_clnt *rpc;
943
944 server = NFS_SB(sb);
945 /* -EIO all pending I/O */
946 rpc = server->client_acl;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
949 rpc = server->client;
950 if (!IS_ERR(rpc))
951 rpc_killall_tasks(rpc);
952 }
953 EXPORT_SYMBOL_GPL(nfs_umount_begin);
954
955 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
956 {
957 struct nfs_parsed_mount_data *data;
958
959 data = kzalloc(sizeof(*data), GFP_KERNEL);
960 if (data) {
961 data->acregmin = NFS_DEF_ACREGMIN;
962 data->acregmax = NFS_DEF_ACREGMAX;
963 data->acdirmin = NFS_DEF_ACDIRMIN;
964 data->acdirmax = NFS_DEF_ACDIRMAX;
965 data->mount_server.port = NFS_UNSPEC_PORT;
966 data->nfs_server.port = NFS_UNSPEC_PORT;
967 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
968 data->auth_flavors[0] = RPC_AUTH_UNIX;
969 data->auth_flavor_len = 1;
970 data->minorversion = 0;
971 data->need_mount = true;
972 data->net = current->nsproxy->net_ns;
973 security_init_mnt_opts(&data->lsm_opts);
974 }
975 return data;
976 }
977
978 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
979 {
980 if (data) {
981 kfree(data->client_address);
982 kfree(data->mount_server.hostname);
983 kfree(data->nfs_server.export_path);
984 kfree(data->nfs_server.hostname);
985 kfree(data->fscache_uniq);
986 security_free_mnt_opts(&data->lsm_opts);
987 kfree(data);
988 }
989 }
990
991 /*
992 * Sanity-check a server address provided by the mount command.
993 *
994 * Address family must be initialized, and address must not be
995 * the ANY address for that family.
996 */
997 static int nfs_verify_server_address(struct sockaddr *addr)
998 {
999 switch (addr->sa_family) {
1000 case AF_INET: {
1001 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
1002 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
1003 }
1004 case AF_INET6: {
1005 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1006 return !ipv6_addr_any(sa);
1007 }
1008 }
1009
1010 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
1011 return 0;
1012 }
1013
1014 /*
1015 * Select between a default port value and a user-specified port value.
1016 * If a zero value is set, then autobind will be used.
1017 */
1018 static void nfs_set_port(struct sockaddr *sap, int *port,
1019 const unsigned short default_port)
1020 {
1021 if (*port == NFS_UNSPEC_PORT)
1022 *port = default_port;
1023
1024 rpc_set_port(sap, *port);
1025 }
1026
1027 /*
1028 * Sanity check the NFS transport protocol.
1029 *
1030 */
1031 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1032 {
1033 switch (mnt->nfs_server.protocol) {
1034 case XPRT_TRANSPORT_UDP:
1035 case XPRT_TRANSPORT_TCP:
1036 case XPRT_TRANSPORT_RDMA:
1037 break;
1038 default:
1039 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1040 }
1041 }
1042
1043 /*
1044 * For text based NFSv2/v3 mounts, the mount protocol transport default
1045 * settings should depend upon the specified NFS transport.
1046 */
1047 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1048 {
1049 nfs_validate_transport_protocol(mnt);
1050
1051 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1052 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1053 return;
1054 switch (mnt->nfs_server.protocol) {
1055 case XPRT_TRANSPORT_UDP:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1057 break;
1058 case XPRT_TRANSPORT_TCP:
1059 case XPRT_TRANSPORT_RDMA:
1060 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1061 }
1062 }
1063
1064 /*
1065 * Parse the value of the 'sec=' option.
1066 */
1067 static int nfs_parse_security_flavors(char *value,
1068 struct nfs_parsed_mount_data *mnt)
1069 {
1070 substring_t args[MAX_OPT_ARGS];
1071
1072 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1073
1074 switch (match_token(value, nfs_secflavor_tokens, args)) {
1075 case Opt_sec_none:
1076 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1077 break;
1078 case Opt_sec_sys:
1079 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1080 break;
1081 case Opt_sec_krb5:
1082 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1083 break;
1084 case Opt_sec_krb5i:
1085 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1086 break;
1087 case Opt_sec_krb5p:
1088 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1089 break;
1090 case Opt_sec_lkey:
1091 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1092 break;
1093 case Opt_sec_lkeyi:
1094 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1095 break;
1096 case Opt_sec_lkeyp:
1097 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1098 break;
1099 case Opt_sec_spkm:
1100 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1101 break;
1102 case Opt_sec_spkmi:
1103 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1104 break;
1105 case Opt_sec_spkmp:
1106 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1107 break;
1108 default:
1109 return 0;
1110 }
1111
1112 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1113 mnt->auth_flavor_len = 1;
1114 return 1;
1115 }
1116
1117 static int nfs_parse_version_string(char *string,
1118 struct nfs_parsed_mount_data *mnt,
1119 substring_t *args)
1120 {
1121 mnt->flags &= ~NFS_MOUNT_VER3;
1122 switch (match_token(string, nfs_vers_tokens, args)) {
1123 case Opt_vers_2:
1124 mnt->version = 2;
1125 break;
1126 case Opt_vers_3:
1127 mnt->flags |= NFS_MOUNT_VER3;
1128 mnt->version = 3;
1129 break;
1130 case Opt_vers_4:
1131 /* Backward compatibility option. In future,
1132 * the mount program should always supply
1133 * a NFSv4 minor version number.
1134 */
1135 mnt->version = 4;
1136 break;
1137 case Opt_vers_4_0:
1138 mnt->version = 4;
1139 mnt->minorversion = 0;
1140 break;
1141 case Opt_vers_4_1:
1142 mnt->version = 4;
1143 mnt->minorversion = 1;
1144 break;
1145 default:
1146 return 0;
1147 }
1148 return 1;
1149 }
1150
1151 static int nfs_get_option_str(substring_t args[], char **option)
1152 {
1153 kfree(*option);
1154 *option = match_strdup(args);
1155 return !option;
1156 }
1157
1158 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1159 {
1160 int rc;
1161 char *string;
1162
1163 string = match_strdup(args);
1164 if (string == NULL)
1165 return -ENOMEM;
1166 rc = kstrtoul(string, 10, option);
1167 kfree(string);
1168
1169 return rc;
1170 }
1171
1172 /*
1173 * Error-check and convert a string of mount options from user space into
1174 * a data structure. The whole mount string is processed; bad options are
1175 * skipped as they are encountered. If there were no errors, return 1;
1176 * otherwise return 0 (zero).
1177 */
1178 static int nfs_parse_mount_options(char *raw,
1179 struct nfs_parsed_mount_data *mnt)
1180 {
1181 char *p, *string, *secdata;
1182 int rc, sloppy = 0, invalid_option = 0;
1183 unsigned short protofamily = AF_UNSPEC;
1184 unsigned short mountfamily = AF_UNSPEC;
1185
1186 if (!raw) {
1187 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1188 return 1;
1189 }
1190 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1191
1192 secdata = alloc_secdata();
1193 if (!secdata)
1194 goto out_nomem;
1195
1196 rc = security_sb_copy_data(raw, secdata);
1197 if (rc)
1198 goto out_security_failure;
1199
1200 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1201 if (rc)
1202 goto out_security_failure;
1203
1204 free_secdata(secdata);
1205
1206 while ((p = strsep(&raw, ",")) != NULL) {
1207 substring_t args[MAX_OPT_ARGS];
1208 unsigned long option;
1209 int token;
1210
1211 if (!*p)
1212 continue;
1213
1214 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1215
1216 token = match_token(p, nfs_mount_option_tokens, args);
1217 switch (token) {
1218
1219 /*
1220 * boolean options: foo/nofoo
1221 */
1222 case Opt_soft:
1223 mnt->flags |= NFS_MOUNT_SOFT;
1224 break;
1225 case Opt_hard:
1226 mnt->flags &= ~NFS_MOUNT_SOFT;
1227 break;
1228 case Opt_posix:
1229 mnt->flags |= NFS_MOUNT_POSIX;
1230 break;
1231 case Opt_noposix:
1232 mnt->flags &= ~NFS_MOUNT_POSIX;
1233 break;
1234 case Opt_cto:
1235 mnt->flags &= ~NFS_MOUNT_NOCTO;
1236 break;
1237 case Opt_nocto:
1238 mnt->flags |= NFS_MOUNT_NOCTO;
1239 break;
1240 case Opt_ac:
1241 mnt->flags &= ~NFS_MOUNT_NOAC;
1242 break;
1243 case Opt_noac:
1244 mnt->flags |= NFS_MOUNT_NOAC;
1245 break;
1246 case Opt_lock:
1247 mnt->flags &= ~NFS_MOUNT_NONLM;
1248 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1249 NFS_MOUNT_LOCAL_FCNTL);
1250 break;
1251 case Opt_nolock:
1252 mnt->flags |= NFS_MOUNT_NONLM;
1253 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1254 NFS_MOUNT_LOCAL_FCNTL);
1255 break;
1256 case Opt_udp:
1257 mnt->flags &= ~NFS_MOUNT_TCP;
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1259 break;
1260 case Opt_tcp:
1261 mnt->flags |= NFS_MOUNT_TCP;
1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1263 break;
1264 case Opt_rdma:
1265 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1266 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1267 xprt_load_transport(p);
1268 break;
1269 case Opt_acl:
1270 mnt->flags &= ~NFS_MOUNT_NOACL;
1271 break;
1272 case Opt_noacl:
1273 mnt->flags |= NFS_MOUNT_NOACL;
1274 break;
1275 case Opt_rdirplus:
1276 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1277 break;
1278 case Opt_nordirplus:
1279 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1280 break;
1281 case Opt_sharecache:
1282 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1283 break;
1284 case Opt_nosharecache:
1285 mnt->flags |= NFS_MOUNT_UNSHARED;
1286 break;
1287 case Opt_resvport:
1288 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1289 break;
1290 case Opt_noresvport:
1291 mnt->flags |= NFS_MOUNT_NORESVPORT;
1292 break;
1293 case Opt_fscache:
1294 mnt->options |= NFS_OPTION_FSCACHE;
1295 kfree(mnt->fscache_uniq);
1296 mnt->fscache_uniq = NULL;
1297 break;
1298 case Opt_nofscache:
1299 mnt->options &= ~NFS_OPTION_FSCACHE;
1300 kfree(mnt->fscache_uniq);
1301 mnt->fscache_uniq = NULL;
1302 break;
1303 case Opt_migration:
1304 mnt->options |= NFS_OPTION_MIGRATION;
1305 break;
1306 case Opt_nomigration:
1307 mnt->options &= NFS_OPTION_MIGRATION;
1308 break;
1309
1310 /*
1311 * options that take numeric values
1312 */
1313 case Opt_port:
1314 if (nfs_get_option_ul(args, &option) ||
1315 option > USHRT_MAX)
1316 goto out_invalid_value;
1317 mnt->nfs_server.port = option;
1318 break;
1319 case Opt_rsize:
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->rsize = option;
1323 break;
1324 case Opt_wsize:
1325 if (nfs_get_option_ul(args, &option))
1326 goto out_invalid_value;
1327 mnt->wsize = option;
1328 break;
1329 case Opt_bsize:
1330 if (nfs_get_option_ul(args, &option))
1331 goto out_invalid_value;
1332 mnt->bsize = option;
1333 break;
1334 case Opt_timeo:
1335 if (nfs_get_option_ul(args, &option) || option == 0)
1336 goto out_invalid_value;
1337 mnt->timeo = option;
1338 break;
1339 case Opt_retrans:
1340 if (nfs_get_option_ul(args, &option) || option == 0)
1341 goto out_invalid_value;
1342 mnt->retrans = option;
1343 break;
1344 case Opt_acregmin:
1345 if (nfs_get_option_ul(args, &option))
1346 goto out_invalid_value;
1347 mnt->acregmin = option;
1348 break;
1349 case Opt_acregmax:
1350 if (nfs_get_option_ul(args, &option))
1351 goto out_invalid_value;
1352 mnt->acregmax = option;
1353 break;
1354 case Opt_acdirmin:
1355 if (nfs_get_option_ul(args, &option))
1356 goto out_invalid_value;
1357 mnt->acdirmin = option;
1358 break;
1359 case Opt_acdirmax:
1360 if (nfs_get_option_ul(args, &option))
1361 goto out_invalid_value;
1362 mnt->acdirmax = option;
1363 break;
1364 case Opt_actimeo:
1365 if (nfs_get_option_ul(args, &option))
1366 goto out_invalid_value;
1367 mnt->acregmin = mnt->acregmax =
1368 mnt->acdirmin = mnt->acdirmax = option;
1369 break;
1370 case Opt_namelen:
1371 if (nfs_get_option_ul(args, &option))
1372 goto out_invalid_value;
1373 mnt->namlen = option;
1374 break;
1375 case Opt_mountport:
1376 if (nfs_get_option_ul(args, &option) ||
1377 option > USHRT_MAX)
1378 goto out_invalid_value;
1379 mnt->mount_server.port = option;
1380 break;
1381 case Opt_mountvers:
1382 if (nfs_get_option_ul(args, &option) ||
1383 option < NFS_MNT_VERSION ||
1384 option > NFS_MNT3_VERSION)
1385 goto out_invalid_value;
1386 mnt->mount_server.version = option;
1387 break;
1388 case Opt_minorversion:
1389 if (nfs_get_option_ul(args, &option))
1390 goto out_invalid_value;
1391 if (option > NFS4_MAX_MINOR_VERSION)
1392 goto out_invalid_value;
1393 mnt->minorversion = option;
1394 break;
1395
1396 /*
1397 * options that take text values
1398 */
1399 case Opt_nfsvers:
1400 string = match_strdup(args);
1401 if (string == NULL)
1402 goto out_nomem;
1403 rc = nfs_parse_version_string(string, mnt, args);
1404 kfree(string);
1405 if (!rc)
1406 goto out_invalid_value;
1407 break;
1408 case Opt_sec:
1409 string = match_strdup(args);
1410 if (string == NULL)
1411 goto out_nomem;
1412 rc = nfs_parse_security_flavors(string, mnt);
1413 kfree(string);
1414 if (!rc) {
1415 dfprintk(MOUNT, "NFS: unrecognized "
1416 "security flavor\n");
1417 return 0;
1418 }
1419 break;
1420 case Opt_proto:
1421 string = match_strdup(args);
1422 if (string == NULL)
1423 goto out_nomem;
1424 token = match_token(string,
1425 nfs_xprt_protocol_tokens, args);
1426
1427 protofamily = AF_INET;
1428 switch (token) {
1429 case Opt_xprt_udp6:
1430 protofamily = AF_INET6;
1431 case Opt_xprt_udp:
1432 mnt->flags &= ~NFS_MOUNT_TCP;
1433 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1434 break;
1435 case Opt_xprt_tcp6:
1436 protofamily = AF_INET6;
1437 case Opt_xprt_tcp:
1438 mnt->flags |= NFS_MOUNT_TCP;
1439 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1440 break;
1441 case Opt_xprt_rdma:
1442 /* vector side protocols to TCP */
1443 mnt->flags |= NFS_MOUNT_TCP;
1444 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1445 xprt_load_transport(string);
1446 break;
1447 default:
1448 dfprintk(MOUNT, "NFS: unrecognized "
1449 "transport protocol\n");
1450 kfree(string);
1451 return 0;
1452 }
1453 kfree(string);
1454 break;
1455 case Opt_mountproto:
1456 string = match_strdup(args);
1457 if (string == NULL)
1458 goto out_nomem;
1459 token = match_token(string,
1460 nfs_xprt_protocol_tokens, args);
1461 kfree(string);
1462
1463 mountfamily = AF_INET;
1464 switch (token) {
1465 case Opt_xprt_udp6:
1466 mountfamily = AF_INET6;
1467 case Opt_xprt_udp:
1468 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1469 break;
1470 case Opt_xprt_tcp6:
1471 mountfamily = AF_INET6;
1472 case Opt_xprt_tcp:
1473 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1474 break;
1475 case Opt_xprt_rdma: /* not used for side protocols */
1476 default:
1477 dfprintk(MOUNT, "NFS: unrecognized "
1478 "transport protocol\n");
1479 return 0;
1480 }
1481 break;
1482 case Opt_addr:
1483 string = match_strdup(args);
1484 if (string == NULL)
1485 goto out_nomem;
1486 mnt->nfs_server.addrlen =
1487 rpc_pton(mnt->net, string, strlen(string),
1488 (struct sockaddr *)
1489 &mnt->nfs_server.address,
1490 sizeof(mnt->nfs_server.address));
1491 kfree(string);
1492 if (mnt->nfs_server.addrlen == 0)
1493 goto out_invalid_address;
1494 break;
1495 case Opt_clientaddr:
1496 if (nfs_get_option_str(args, &mnt->client_address))
1497 goto out_nomem;
1498 break;
1499 case Opt_mounthost:
1500 if (nfs_get_option_str(args,
1501 &mnt->mount_server.hostname))
1502 goto out_nomem;
1503 break;
1504 case Opt_mountaddr:
1505 string = match_strdup(args);
1506 if (string == NULL)
1507 goto out_nomem;
1508 mnt->mount_server.addrlen =
1509 rpc_pton(mnt->net, string, strlen(string),
1510 (struct sockaddr *)
1511 &mnt->mount_server.address,
1512 sizeof(mnt->mount_server.address));
1513 kfree(string);
1514 if (mnt->mount_server.addrlen == 0)
1515 goto out_invalid_address;
1516 break;
1517 case Opt_lookupcache:
1518 string = match_strdup(args);
1519 if (string == NULL)
1520 goto out_nomem;
1521 token = match_token(string,
1522 nfs_lookupcache_tokens, args);
1523 kfree(string);
1524 switch (token) {
1525 case Opt_lookupcache_all:
1526 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1527 break;
1528 case Opt_lookupcache_positive:
1529 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1530 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1531 break;
1532 case Opt_lookupcache_none:
1533 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1534 break;
1535 default:
1536 dfprintk(MOUNT, "NFS: invalid "
1537 "lookupcache argument\n");
1538 return 0;
1539 };
1540 break;
1541 case Opt_fscache_uniq:
1542 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1543 goto out_nomem;
1544 mnt->options |= NFS_OPTION_FSCACHE;
1545 break;
1546 case Opt_local_lock:
1547 string = match_strdup(args);
1548 if (string == NULL)
1549 goto out_nomem;
1550 token = match_token(string, nfs_local_lock_tokens,
1551 args);
1552 kfree(string);
1553 switch (token) {
1554 case Opt_local_lock_all:
1555 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1557 break;
1558 case Opt_local_lock_flock:
1559 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1560 break;
1561 case Opt_local_lock_posix:
1562 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1563 break;
1564 case Opt_local_lock_none:
1565 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1566 NFS_MOUNT_LOCAL_FCNTL);
1567 break;
1568 default:
1569 dfprintk(MOUNT, "NFS: invalid "
1570 "local_lock argument\n");
1571 return 0;
1572 };
1573 break;
1574
1575 /*
1576 * Special options
1577 */
1578 case Opt_sloppy:
1579 sloppy = 1;
1580 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1581 break;
1582 case Opt_userspace:
1583 case Opt_deprecated:
1584 dfprintk(MOUNT, "NFS: ignoring mount option "
1585 "'%s'\n", p);
1586 break;
1587
1588 default:
1589 invalid_option = 1;
1590 dfprintk(MOUNT, "NFS: unrecognized mount option "
1591 "'%s'\n", p);
1592 }
1593 }
1594
1595 if (!sloppy && invalid_option)
1596 return 0;
1597
1598 if (mnt->minorversion && mnt->version != 4)
1599 goto out_minorversion_mismatch;
1600
1601 if (mnt->options & NFS_OPTION_MIGRATION &&
1602 mnt->version != 4 && mnt->minorversion != 0)
1603 goto out_migration_misuse;
1604
1605 /*
1606 * verify that any proto=/mountproto= options match the address
1607 * families in the addr=/mountaddr= options.
1608 */
1609 if (protofamily != AF_UNSPEC &&
1610 protofamily != mnt->nfs_server.address.ss_family)
1611 goto out_proto_mismatch;
1612
1613 if (mountfamily != AF_UNSPEC) {
1614 if (mnt->mount_server.addrlen) {
1615 if (mountfamily != mnt->mount_server.address.ss_family)
1616 goto out_mountproto_mismatch;
1617 } else {
1618 if (mountfamily != mnt->nfs_server.address.ss_family)
1619 goto out_mountproto_mismatch;
1620 }
1621 }
1622
1623 return 1;
1624
1625 out_mountproto_mismatch:
1626 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1627 "option\n");
1628 return 0;
1629 out_proto_mismatch:
1630 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1631 return 0;
1632 out_invalid_address:
1633 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1634 return 0;
1635 out_invalid_value:
1636 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1637 return 0;
1638 out_minorversion_mismatch:
1639 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1640 "minorversion=%u\n", mnt->version, mnt->minorversion);
1641 return 0;
1642 out_migration_misuse:
1643 printk(KERN_INFO
1644 "NFS: 'migration' not supported for this NFS version\n");
1645 return 0;
1646 out_nomem:
1647 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1648 return 0;
1649 out_security_failure:
1650 free_secdata(secdata);
1651 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1652 return 0;
1653 }
1654
1655 /*
1656 * Match the requested auth flavors with the list returned by
1657 * the server. Returns zero and sets the mount's authentication
1658 * flavor on success; returns -EACCES if server does not support
1659 * the requested flavor.
1660 */
1661 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1662 struct nfs_mount_request *request)
1663 {
1664 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1665
1666 /*
1667 * Certain releases of Linux's mountd return an empty
1668 * flavor list. To prevent behavioral regression with
1669 * these servers (ie. rejecting mounts that used to
1670 * succeed), revert to pre-2.6.32 behavior (no checking)
1671 * if the returned flavor list is empty.
1672 */
1673 if (server_authlist_len == 0)
1674 return 0;
1675
1676 /*
1677 * We avoid sophisticated negotiating here, as there are
1678 * plenty of cases where we can get it wrong, providing
1679 * either too little or too much security.
1680 *
1681 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1682 * flavor listed first. However, some servers list
1683 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1684 * preferred default, in args->auth_flavors[0] if user
1685 * didn't specify sec= mount option.
1686 */
1687 for (i = 0; i < args->auth_flavor_len; i++)
1688 for (j = 0; j < server_authlist_len; j++)
1689 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1690 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1691 request->auth_flavs[j]);
1692 args->auth_flavors[0] = request->auth_flavs[j];
1693 return 0;
1694 }
1695
1696 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1697 nfs_umount(request);
1698 return -EACCES;
1699 }
1700
1701 /*
1702 * Use the remote server's MOUNT service to request the NFS file handle
1703 * corresponding to the provided path.
1704 */
1705 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1706 struct nfs_fh *root_fh)
1707 {
1708 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1709 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1710 struct nfs_mount_request request = {
1711 .sap = (struct sockaddr *)
1712 &args->mount_server.address,
1713 .dirpath = args->nfs_server.export_path,
1714 .protocol = args->mount_server.protocol,
1715 .fh = root_fh,
1716 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1717 .auth_flav_len = &server_authlist_len,
1718 .auth_flavs = server_authlist,
1719 .net = args->net,
1720 };
1721 int status;
1722
1723 if (args->mount_server.version == 0) {
1724 switch (args->version) {
1725 default:
1726 args->mount_server.version = NFS_MNT3_VERSION;
1727 break;
1728 case 2:
1729 args->mount_server.version = NFS_MNT_VERSION;
1730 }
1731 }
1732 request.version = args->mount_server.version;
1733
1734 if (args->mount_server.hostname)
1735 request.hostname = args->mount_server.hostname;
1736 else
1737 request.hostname = args->nfs_server.hostname;
1738
1739 /*
1740 * Construct the mount server's address.
1741 */
1742 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1743 memcpy(request.sap, &args->nfs_server.address,
1744 args->nfs_server.addrlen);
1745 args->mount_server.addrlen = args->nfs_server.addrlen;
1746 }
1747 request.salen = args->mount_server.addrlen;
1748 nfs_set_port(request.sap, &args->mount_server.port, 0);
1749
1750 /*
1751 * Now ask the mount server to map our export path
1752 * to a file handle.
1753 */
1754 status = nfs_mount(&request);
1755 if (status != 0) {
1756 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1757 request.hostname, status);
1758 return status;
1759 }
1760
1761 /*
1762 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1763 */
1764 if (args->mount_server.version != NFS_MNT3_VERSION)
1765 return 0;
1766 return nfs_walk_authlist(args, &request);
1767 }
1768
1769 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1770 struct nfs_mount_info *mount_info,
1771 struct nfs_subversion *nfs_mod)
1772 {
1773 int status;
1774 struct nfs_server *server;
1775
1776 if (mount_info->parsed->need_mount) {
1777 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1778 if (status)
1779 return ERR_PTR(status);
1780 }
1781
1782 /* Get a volume representation */
1783 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1784 if (IS_ERR(server))
1785 return ERR_CAST(server);
1786
1787 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1788 }
1789 EXPORT_SYMBOL_GPL(nfs_try_mount);
1790
1791 /*
1792 * Split "dev_name" into "hostname:export_path".
1793 *
1794 * The leftmost colon demarks the split between the server's hostname
1795 * and the export path. If the hostname starts with a left square
1796 * bracket, then it may contain colons.
1797 *
1798 * Note: caller frees hostname and export path, even on error.
1799 */
1800 static int nfs_parse_devname(const char *dev_name,
1801 char **hostname, size_t maxnamlen,
1802 char **export_path, size_t maxpathlen)
1803 {
1804 size_t len;
1805 char *end;
1806
1807 /* Is the host name protected with square brakcets? */
1808 if (*dev_name == '[') {
1809 end = strchr(++dev_name, ']');
1810 if (end == NULL || end[1] != ':')
1811 goto out_bad_devname;
1812
1813 len = end - dev_name;
1814 end++;
1815 } else {
1816 char *comma;
1817
1818 end = strchr(dev_name, ':');
1819 if (end == NULL)
1820 goto out_bad_devname;
1821 len = end - dev_name;
1822
1823 /* kill possible hostname list: not supported */
1824 comma = strchr(dev_name, ',');
1825 if (comma != NULL && comma < end)
1826 *comma = 0;
1827 }
1828
1829 if (len > maxnamlen)
1830 goto out_hostname;
1831
1832 /* N.B. caller will free nfs_server.hostname in all cases */
1833 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1834 if (*hostname == NULL)
1835 goto out_nomem;
1836 len = strlen(++end);
1837 if (len > maxpathlen)
1838 goto out_path;
1839 *export_path = kstrndup(end, len, GFP_KERNEL);
1840 if (!*export_path)
1841 goto out_nomem;
1842
1843 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1844 return 0;
1845
1846 out_bad_devname:
1847 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1848 return -EINVAL;
1849
1850 out_nomem:
1851 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1852 return -ENOMEM;
1853
1854 out_hostname:
1855 dfprintk(MOUNT, "NFS: server hostname too long\n");
1856 return -ENAMETOOLONG;
1857
1858 out_path:
1859 dfprintk(MOUNT, "NFS: export pathname too long\n");
1860 return -ENAMETOOLONG;
1861 }
1862
1863 /*
1864 * Validate the NFS2/NFS3 mount data
1865 * - fills in the mount root filehandle
1866 *
1867 * For option strings, user space handles the following behaviors:
1868 *
1869 * + DNS: mapping server host name to IP address ("addr=" option)
1870 *
1871 * + failure mode: how to behave if a mount request can't be handled
1872 * immediately ("fg/bg" option)
1873 *
1874 * + retry: how often to retry a mount request ("retry=" option)
1875 *
1876 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1877 * mountproto=tcp after mountproto=udp, and so on
1878 */
1879 static int nfs23_validate_mount_data(void *options,
1880 struct nfs_parsed_mount_data *args,
1881 struct nfs_fh *mntfh,
1882 const char *dev_name)
1883 {
1884 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1885 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1886
1887 if (data == NULL)
1888 goto out_no_data;
1889
1890 args->version = NFS_DEFAULT_VERSION;
1891 switch (data->version) {
1892 case 1:
1893 data->namlen = 0;
1894 case 2:
1895 data->bsize = 0;
1896 case 3:
1897 if (data->flags & NFS_MOUNT_VER3)
1898 goto out_no_v3;
1899 data->root.size = NFS2_FHSIZE;
1900 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1901 case 4:
1902 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1903 goto out_no_sec;
1904 case 5:
1905 memset(data->context, 0, sizeof(data->context));
1906 case 6:
1907 if (data->flags & NFS_MOUNT_VER3) {
1908 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1909 goto out_invalid_fh;
1910 mntfh->size = data->root.size;
1911 args->version = 3;
1912 } else {
1913 mntfh->size = NFS2_FHSIZE;
1914 args->version = 2;
1915 }
1916
1917
1918 memcpy(mntfh->data, data->root.data, mntfh->size);
1919 if (mntfh->size < sizeof(mntfh->data))
1920 memset(mntfh->data + mntfh->size, 0,
1921 sizeof(mntfh->data) - mntfh->size);
1922
1923 /*
1924 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1925 * can deal with.
1926 */
1927 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1928 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1929 args->rsize = data->rsize;
1930 args->wsize = data->wsize;
1931 args->timeo = data->timeo;
1932 args->retrans = data->retrans;
1933 args->acregmin = data->acregmin;
1934 args->acregmax = data->acregmax;
1935 args->acdirmin = data->acdirmin;
1936 args->acdirmax = data->acdirmax;
1937 args->need_mount = false;
1938
1939 memcpy(sap, &data->addr, sizeof(data->addr));
1940 args->nfs_server.addrlen = sizeof(data->addr);
1941 args->nfs_server.port = ntohs(data->addr.sin_port);
1942 if (!nfs_verify_server_address(sap))
1943 goto out_no_address;
1944
1945 if (!(data->flags & NFS_MOUNT_TCP))
1946 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1947 /* N.B. caller will free nfs_server.hostname in all cases */
1948 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1949 args->namlen = data->namlen;
1950 args->bsize = data->bsize;
1951
1952 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1953 args->auth_flavors[0] = data->pseudoflavor;
1954 if (!args->nfs_server.hostname)
1955 goto out_nomem;
1956
1957 if (!(data->flags & NFS_MOUNT_NONLM))
1958 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1959 NFS_MOUNT_LOCAL_FCNTL);
1960 else
1961 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1962 NFS_MOUNT_LOCAL_FCNTL);
1963 /*
1964 * The legacy version 6 binary mount data from userspace has a
1965 * field used only to transport selinux information into the
1966 * the kernel. To continue to support that functionality we
1967 * have a touch of selinux knowledge here in the NFS code. The
1968 * userspace code converted context=blah to just blah so we are
1969 * converting back to the full string selinux understands.
1970 */
1971 if (data->context[0]){
1972 #ifdef CONFIG_SECURITY_SELINUX
1973 int rc;
1974 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1975 if (!opts_str)
1976 return -ENOMEM;
1977 strcpy(opts_str, "context=");
1978 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1979 strcat(opts_str, &data->context[0]);
1980 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1981 kfree(opts_str);
1982 if (rc)
1983 return rc;
1984 #else
1985 return -EINVAL;
1986 #endif
1987 }
1988
1989 break;
1990 default:
1991 return NFS_TEXT_DATA;
1992 }
1993
1994 #if !IS_ENABLED(CONFIG_NFS_V3)
1995 if (args->version == 3)
1996 goto out_v3_not_compiled;
1997 #endif /* !CONFIG_NFS_V3 */
1998
1999 return 0;
2000
2001 out_no_data:
2002 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2003 return -EINVAL;
2004
2005 out_no_v3:
2006 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2007 data->version);
2008 return -EINVAL;
2009
2010 out_no_sec:
2011 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2012 return -EINVAL;
2013
2014 #if !IS_ENABLED(CONFIG_NFS_V3)
2015 out_v3_not_compiled:
2016 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2017 return -EPROTONOSUPPORT;
2018 #endif /* !CONFIG_NFS_V3 */
2019
2020 out_nomem:
2021 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2022 return -ENOMEM;
2023
2024 out_no_address:
2025 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2026 return -EINVAL;
2027
2028 out_invalid_fh:
2029 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2030 return -EINVAL;
2031 }
2032
2033 #if IS_ENABLED(CONFIG_NFS_V4)
2034 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2035 void *options,
2036 struct nfs_parsed_mount_data *args,
2037 struct nfs_fh *mntfh,
2038 const char *dev_name)
2039 {
2040 if (fs_type == &nfs_fs_type)
2041 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2042 return nfs4_validate_mount_data(options, args, dev_name);
2043 }
2044 #else
2045 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2046 void *options,
2047 struct nfs_parsed_mount_data *args,
2048 struct nfs_fh *mntfh,
2049 const char *dev_name)
2050 {
2051 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2052 }
2053 #endif
2054
2055 static int nfs_validate_text_mount_data(void *options,
2056 struct nfs_parsed_mount_data *args,
2057 const char *dev_name)
2058 {
2059 int port = 0;
2060 int max_namelen = PAGE_SIZE;
2061 int max_pathlen = NFS_MAXPATHLEN;
2062 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2063
2064 if (nfs_parse_mount_options((char *)options, args) == 0)
2065 return -EINVAL;
2066
2067 if (!nfs_verify_server_address(sap))
2068 goto out_no_address;
2069
2070 if (args->version == 4) {
2071 #if IS_ENABLED(CONFIG_NFS_V4)
2072 port = NFS_PORT;
2073 max_namelen = NFS4_MAXNAMLEN;
2074 max_pathlen = NFS4_MAXPATHLEN;
2075 nfs_validate_transport_protocol(args);
2076 nfs4_validate_mount_flags(args);
2077 #else
2078 goto out_v4_not_compiled;
2079 #endif /* CONFIG_NFS_V4 */
2080 } else
2081 nfs_set_mount_transport_protocol(args);
2082
2083 nfs_set_port(sap, &args->nfs_server.port, port);
2084
2085 if (args->auth_flavor_len > 1)
2086 goto out_bad_auth;
2087
2088 return nfs_parse_devname(dev_name,
2089 &args->nfs_server.hostname,
2090 max_namelen,
2091 &args->nfs_server.export_path,
2092 max_pathlen);
2093
2094 #if !IS_ENABLED(CONFIG_NFS_V4)
2095 out_v4_not_compiled:
2096 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2097 return -EPROTONOSUPPORT;
2098 #endif /* !CONFIG_NFS_V4 */
2099
2100 out_no_address:
2101 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2102 return -EINVAL;
2103
2104 out_bad_auth:
2105 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2106 return -EINVAL;
2107 }
2108
2109 static int
2110 nfs_compare_remount_data(struct nfs_server *nfss,
2111 struct nfs_parsed_mount_data *data)
2112 {
2113 if (data->flags != nfss->flags ||
2114 data->rsize != nfss->rsize ||
2115 data->wsize != nfss->wsize ||
2116 data->retrans != nfss->client->cl_timeout->to_retries ||
2117 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2118 data->acregmin != nfss->acregmin / HZ ||
2119 data->acregmax != nfss->acregmax / HZ ||
2120 data->acdirmin != nfss->acdirmin / HZ ||
2121 data->acdirmax != nfss->acdirmax / HZ ||
2122 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2123 data->nfs_server.port != nfss->port ||
2124 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2125 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2126 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2127 return -EINVAL;
2128
2129 return 0;
2130 }
2131
2132 int
2133 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2134 {
2135 int error;
2136 struct nfs_server *nfss = sb->s_fs_info;
2137 struct nfs_parsed_mount_data *data;
2138 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2139 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2140 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2141
2142 /*
2143 * Userspace mount programs that send binary options generally send
2144 * them populated with default values. We have no way to know which
2145 * ones were explicitly specified. Fall back to legacy behavior and
2146 * just return success.
2147 */
2148 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2149 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2150 options->version <= 6))))
2151 return 0;
2152
2153 data = kzalloc(sizeof(*data), GFP_KERNEL);
2154 if (data == NULL)
2155 return -ENOMEM;
2156
2157 /* fill out struct with values from existing mount */
2158 data->flags = nfss->flags;
2159 data->rsize = nfss->rsize;
2160 data->wsize = nfss->wsize;
2161 data->retrans = nfss->client->cl_timeout->to_retries;
2162 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2163 data->acregmin = nfss->acregmin / HZ;
2164 data->acregmax = nfss->acregmax / HZ;
2165 data->acdirmin = nfss->acdirmin / HZ;
2166 data->acdirmax = nfss->acdirmax / HZ;
2167 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2168 data->nfs_server.port = nfss->port;
2169 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2170 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2171 data->nfs_server.addrlen);
2172
2173 /* overwrite those values with any that were specified */
2174 error = nfs_parse_mount_options((char *)options, data);
2175 if (error < 0)
2176 goto out;
2177
2178 /*
2179 * noac is a special case. It implies -o sync, but that's not
2180 * necessarily reflected in the mtab options. do_remount_sb
2181 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2182 * remount options, so we have to explicitly reset it.
2183 */
2184 if (data->flags & NFS_MOUNT_NOAC)
2185 *flags |= MS_SYNCHRONOUS;
2186
2187 /* compare new mount options with old ones */
2188 error = nfs_compare_remount_data(nfss, data);
2189 out:
2190 kfree(data);
2191 return error;
2192 }
2193 EXPORT_SYMBOL_GPL(nfs_remount);
2194
2195 /*
2196 * Initialise the common bits of the superblock
2197 */
2198 inline void nfs_initialise_sb(struct super_block *sb)
2199 {
2200 struct nfs_server *server = NFS_SB(sb);
2201
2202 sb->s_magic = NFS_SUPER_MAGIC;
2203
2204 /* We probably want something more informative here */
2205 snprintf(sb->s_id, sizeof(sb->s_id),
2206 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2207
2208 if (sb->s_blocksize == 0)
2209 sb->s_blocksize = nfs_block_bits(server->wsize,
2210 &sb->s_blocksize_bits);
2211
2212 sb->s_bdi = &server->backing_dev_info;
2213
2214 nfs_super_set_maxbytes(sb, server->maxfilesize);
2215 }
2216
2217 /*
2218 * Finish setting up an NFS2/3 superblock
2219 */
2220 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2221 {
2222 struct nfs_parsed_mount_data *data = mount_info->parsed;
2223 struct nfs_server *server = NFS_SB(sb);
2224
2225 sb->s_blocksize_bits = 0;
2226 sb->s_blocksize = 0;
2227 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2228 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2229 if (data && data->bsize)
2230 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2231
2232 if (server->nfs_client->rpc_ops->version != 2) {
2233 /* The VFS shouldn't apply the umask to mode bits. We will do
2234 * so ourselves when necessary.
2235 */
2236 sb->s_flags |= MS_POSIXACL;
2237 sb->s_time_gran = 1;
2238 }
2239
2240 nfs_initialise_sb(sb);
2241 }
2242 EXPORT_SYMBOL_GPL(nfs_fill_super);
2243
2244 /*
2245 * Finish setting up a cloned NFS2/3/4 superblock
2246 */
2247 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2248 {
2249 const struct super_block *old_sb = mount_info->cloned->sb;
2250 struct nfs_server *server = NFS_SB(sb);
2251
2252 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2253 sb->s_blocksize = old_sb->s_blocksize;
2254 sb->s_maxbytes = old_sb->s_maxbytes;
2255 sb->s_xattr = old_sb->s_xattr;
2256 sb->s_op = old_sb->s_op;
2257 sb->s_time_gran = 1;
2258
2259 if (server->nfs_client->rpc_ops->version != 2) {
2260 /* The VFS shouldn't apply the umask to mode bits. We will do
2261 * so ourselves when necessary.
2262 */
2263 sb->s_flags |= MS_POSIXACL;
2264 }
2265
2266 nfs_initialise_sb(sb);
2267 }
2268
2269 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2270 {
2271 const struct nfs_server *a = s->s_fs_info;
2272 const struct rpc_clnt *clnt_a = a->client;
2273 const struct rpc_clnt *clnt_b = b->client;
2274
2275 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2276 goto Ebusy;
2277 if (a->nfs_client != b->nfs_client)
2278 goto Ebusy;
2279 if (a->flags != b->flags)
2280 goto Ebusy;
2281 if (a->wsize != b->wsize)
2282 goto Ebusy;
2283 if (a->rsize != b->rsize)
2284 goto Ebusy;
2285 if (a->acregmin != b->acregmin)
2286 goto Ebusy;
2287 if (a->acregmax != b->acregmax)
2288 goto Ebusy;
2289 if (a->acdirmin != b->acdirmin)
2290 goto Ebusy;
2291 if (a->acdirmax != b->acdirmax)
2292 goto Ebusy;
2293 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2294 goto Ebusy;
2295 return 1;
2296 Ebusy:
2297 return 0;
2298 }
2299
2300 struct nfs_sb_mountdata {
2301 struct nfs_server *server;
2302 int mntflags;
2303 };
2304
2305 static int nfs_set_super(struct super_block *s, void *data)
2306 {
2307 struct nfs_sb_mountdata *sb_mntdata = data;
2308 struct nfs_server *server = sb_mntdata->server;
2309 int ret;
2310
2311 s->s_flags = sb_mntdata->mntflags;
2312 s->s_fs_info = server;
2313 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2314 ret = set_anon_super(s, server);
2315 if (ret == 0)
2316 server->s_dev = s->s_dev;
2317 return ret;
2318 }
2319
2320 static int nfs_compare_super_address(struct nfs_server *server1,
2321 struct nfs_server *server2)
2322 {
2323 struct sockaddr *sap1, *sap2;
2324
2325 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2326 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2327
2328 if (sap1->sa_family != sap2->sa_family)
2329 return 0;
2330
2331 switch (sap1->sa_family) {
2332 case AF_INET: {
2333 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2334 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2335 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2336 return 0;
2337 if (sin1->sin_port != sin2->sin_port)
2338 return 0;
2339 break;
2340 }
2341 case AF_INET6: {
2342 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2343 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2344 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2345 return 0;
2346 if (sin1->sin6_port != sin2->sin6_port)
2347 return 0;
2348 break;
2349 }
2350 default:
2351 return 0;
2352 }
2353
2354 return 1;
2355 }
2356
2357 static int nfs_compare_super(struct super_block *sb, void *data)
2358 {
2359 struct nfs_sb_mountdata *sb_mntdata = data;
2360 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2361 int mntflags = sb_mntdata->mntflags;
2362
2363 if (!nfs_compare_super_address(old, server))
2364 return 0;
2365 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2366 if (old->flags & NFS_MOUNT_UNSHARED)
2367 return 0;
2368 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2369 return 0;
2370 return nfs_compare_mount_options(sb, server, mntflags);
2371 }
2372
2373 #ifdef CONFIG_NFS_FSCACHE
2374 static void nfs_get_cache_cookie(struct super_block *sb,
2375 struct nfs_parsed_mount_data *parsed,
2376 struct nfs_clone_mount *cloned)
2377 {
2378 struct nfs_server *nfss = NFS_SB(sb);
2379 char *uniq = NULL;
2380 int ulen = 0;
2381
2382 nfss->fscache_key = NULL;
2383 nfss->fscache = NULL;
2384
2385 if (parsed) {
2386 if (!(parsed->options & NFS_OPTION_FSCACHE))
2387 return;
2388 if (parsed->fscache_uniq) {
2389 uniq = parsed->fscache_uniq;
2390 ulen = strlen(parsed->fscache_uniq);
2391 }
2392 } else if (cloned) {
2393 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2394 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2395 return;
2396 if (mnt_s->fscache_key) {
2397 uniq = mnt_s->fscache_key->key.uniquifier;
2398 ulen = mnt_s->fscache_key->key.uniq_len;
2399 };
2400 } else
2401 return;
2402
2403 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2404 }
2405 #else
2406 static void nfs_get_cache_cookie(struct super_block *sb,
2407 struct nfs_parsed_mount_data *parsed,
2408 struct nfs_clone_mount *cloned)
2409 {
2410 }
2411 #endif
2412
2413 static int nfs_bdi_register(struct nfs_server *server)
2414 {
2415 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2416 }
2417
2418 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2419 struct nfs_mount_info *mount_info)
2420 {
2421 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2422 }
2423 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2424
2425 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2426 struct nfs_mount_info *mount_info)
2427 {
2428 /* clone any lsm security options from the parent to the new sb */
2429 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2430 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2431 return -ESTALE;
2432 return 0;
2433 }
2434 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2435
2436 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2437 int flags, const char *dev_name,
2438 struct nfs_mount_info *mount_info,
2439 struct nfs_subversion *nfs_mod)
2440 {
2441 struct super_block *s;
2442 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2443 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2444 struct nfs_sb_mountdata sb_mntdata = {
2445 .mntflags = flags,
2446 .server = server,
2447 };
2448 int error;
2449
2450 if (server->flags & NFS_MOUNT_UNSHARED)
2451 compare_super = NULL;
2452
2453 /* -o noac implies -o sync */
2454 if (server->flags & NFS_MOUNT_NOAC)
2455 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2456
2457 /* Get a superblock - note that we may end up sharing one that already exists */
2458 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2459 if (IS_ERR(s)) {
2460 mntroot = ERR_CAST(s);
2461 goto out_err_nosb;
2462 }
2463
2464 if (s->s_fs_info != server) {
2465 nfs_free_server(server);
2466 server = NULL;
2467 } else {
2468 error = nfs_bdi_register(server);
2469 if (error) {
2470 mntroot = ERR_PTR(error);
2471 goto error_splat_bdi;
2472 }
2473 }
2474
2475 if (!s->s_root) {
2476 /* initial superblock/root creation */
2477 mount_info->fill_super(s, mount_info);
2478 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2479 }
2480
2481 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2482 if (IS_ERR(mntroot))
2483 goto error_splat_super;
2484
2485 error = mount_info->set_security(s, mntroot, mount_info);
2486 if (error)
2487 goto error_splat_root;
2488
2489 s->s_flags |= MS_ACTIVE;
2490
2491 out:
2492 return mntroot;
2493
2494 out_err_nosb:
2495 nfs_free_server(server);
2496 goto out;
2497
2498 error_splat_root:
2499 dput(mntroot);
2500 mntroot = ERR_PTR(error);
2501 error_splat_super:
2502 if (server && !s->s_root)
2503 bdi_unregister(&server->backing_dev_info);
2504 error_splat_bdi:
2505 deactivate_locked_super(s);
2506 goto out;
2507 }
2508 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2509
2510 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2511 int flags, const char *dev_name, void *raw_data)
2512 {
2513 struct nfs_mount_info mount_info = {
2514 .fill_super = nfs_fill_super,
2515 .set_security = nfs_set_sb_security,
2516 };
2517 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2518 struct nfs_subversion *nfs_mod;
2519 int error;
2520
2521 mount_info.parsed = nfs_alloc_parsed_mount_data();
2522 mount_info.mntfh = nfs_alloc_fhandle();
2523 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2524 goto out;
2525
2526 /* Validate the mount data */
2527 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2528 if (error == NFS_TEXT_DATA)
2529 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2530 if (error < 0) {
2531 mntroot = ERR_PTR(error);
2532 goto out;
2533 }
2534
2535 nfs_mod = get_nfs_version(mount_info.parsed->version);
2536 if (IS_ERR(nfs_mod)) {
2537 mntroot = ERR_CAST(nfs_mod);
2538 goto out;
2539 }
2540
2541 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2542
2543 put_nfs_version(nfs_mod);
2544 out:
2545 nfs_free_parsed_mount_data(mount_info.parsed);
2546 nfs_free_fhandle(mount_info.mntfh);
2547 return mntroot;
2548 }
2549 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2550
2551 /*
2552 * Ensure that we unregister the bdi before kill_anon_super
2553 * releases the device name
2554 */
2555 void nfs_put_super(struct super_block *s)
2556 {
2557 struct nfs_server *server = NFS_SB(s);
2558
2559 bdi_unregister(&server->backing_dev_info);
2560 }
2561 EXPORT_SYMBOL_GPL(nfs_put_super);
2562
2563 /*
2564 * Destroy an NFS2/3 superblock
2565 */
2566 void nfs_kill_super(struct super_block *s)
2567 {
2568 struct nfs_server *server = NFS_SB(s);
2569
2570 kill_anon_super(s);
2571 nfs_fscache_release_super_cookie(s);
2572 nfs_free_server(server);
2573 }
2574 EXPORT_SYMBOL_GPL(nfs_kill_super);
2575
2576 /*
2577 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2578 */
2579 static struct dentry *
2580 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2581 const char *dev_name, void *raw_data)
2582 {
2583 struct nfs_clone_mount *data = raw_data;
2584 struct nfs_mount_info mount_info = {
2585 .fill_super = nfs_clone_super,
2586 .set_security = nfs_clone_sb_security,
2587 .cloned = data,
2588 };
2589 struct nfs_server *server;
2590 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2591 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2592 int error;
2593
2594 dprintk("--> nfs_xdev_mount_common()\n");
2595
2596 mount_info.mntfh = mount_info.cloned->fh;
2597
2598 /* create a new volume representation */
2599 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2600 if (IS_ERR(server)) {
2601 error = PTR_ERR(server);
2602 goto out_err;
2603 }
2604
2605 mntroot = nfs_fs_mount_common(server, flags, dev_name, &mount_info, nfs_mod);
2606 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2607 out:
2608 return mntroot;
2609
2610 out_err:
2611 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2612 goto out;
2613 }
2614
2615 #if IS_ENABLED(CONFIG_NFS_V4)
2616
2617 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2618 {
2619 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2620 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2621 }
2622
2623 /*
2624 * Validate NFSv4 mount options
2625 */
2626 static int nfs4_validate_mount_data(void *options,
2627 struct nfs_parsed_mount_data *args,
2628 const char *dev_name)
2629 {
2630 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2631 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2632 char *c;
2633
2634 if (data == NULL)
2635 goto out_no_data;
2636
2637 args->version = 4;
2638
2639 switch (data->version) {
2640 case 1:
2641 if (data->host_addrlen > sizeof(args->nfs_server.address))
2642 goto out_no_address;
2643 if (data->host_addrlen == 0)
2644 goto out_no_address;
2645 args->nfs_server.addrlen = data->host_addrlen;
2646 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2647 return -EFAULT;
2648 if (!nfs_verify_server_address(sap))
2649 goto out_no_address;
2650 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2651
2652 if (data->auth_flavourlen) {
2653 if (data->auth_flavourlen > 1)
2654 goto out_inval_auth;
2655 if (copy_from_user(&args->auth_flavors[0],
2656 data->auth_flavours,
2657 sizeof(args->auth_flavors[0])))
2658 return -EFAULT;
2659 }
2660
2661 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
2664 args->nfs_server.hostname = c;
2665
2666 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2667 if (IS_ERR(c))
2668 return PTR_ERR(c);
2669 args->nfs_server.export_path = c;
2670 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2671
2672 c = strndup_user(data->client_addr.data, 16);
2673 if (IS_ERR(c))
2674 return PTR_ERR(c);
2675 args->client_address = c;
2676
2677 /*
2678 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2679 * can deal with.
2680 */
2681
2682 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2683 args->rsize = data->rsize;
2684 args->wsize = data->wsize;
2685 args->timeo = data->timeo;
2686 args->retrans = data->retrans;
2687 args->acregmin = data->acregmin;
2688 args->acregmax = data->acregmax;
2689 args->acdirmin = data->acdirmin;
2690 args->acdirmax = data->acdirmax;
2691 args->nfs_server.protocol = data->proto;
2692 nfs_validate_transport_protocol(args);
2693
2694 break;
2695 default:
2696 return NFS_TEXT_DATA;
2697 }
2698
2699 return 0;
2700
2701 out_no_data:
2702 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2703 return -EINVAL;
2704
2705 out_inval_auth:
2706 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2707 data->auth_flavourlen);
2708 return -EINVAL;
2709
2710 out_no_address:
2711 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2712 return -EINVAL;
2713 }
2714
2715 /*
2716 * NFS v4 module parameters need to stay in the
2717 * NFS client for backwards compatibility
2718 */
2719 unsigned int nfs_callback_set_tcpport;
2720 unsigned short nfs_callback_tcpport;
2721 /* Default cache timeout is 10 minutes */
2722 unsigned int nfs_idmap_cache_timeout = 600;
2723 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2724 bool nfs4_disable_idmapping = true;
2725 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2726 unsigned short send_implementation_id = 1;
2727 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2728
2729 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2730 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2731 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2732 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2733 EXPORT_SYMBOL_GPL(max_session_slots);
2734 EXPORT_SYMBOL_GPL(send_implementation_id);
2735 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2736
2737 #define NFS_CALLBACK_MAXPORTNR (65535U)
2738
2739 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2740 {
2741 unsigned long num;
2742 int ret;
2743
2744 if (!val)
2745 return -EINVAL;
2746 ret = kstrtoul(val, 0, &num);
2747 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2748 return -EINVAL;
2749 *((unsigned int *)kp->arg) = num;
2750 return 0;
2751 }
2752 static struct kernel_param_ops param_ops_portnr = {
2753 .set = param_set_portnr,
2754 .get = param_get_uint,
2755 };
2756 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2757
2758 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2759 module_param(nfs_idmap_cache_timeout, int, 0644);
2760 module_param(nfs4_disable_idmapping, bool, 0644);
2761 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2762 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2763 MODULE_PARM_DESC(nfs4_disable_idmapping,
2764 "Turn off NFSv4 idmapping when using 'sec=sys'");
2765 module_param(max_session_slots, ushort, 0644);
2766 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2767 "requests the client will negotiate");
2768 module_param(send_implementation_id, ushort, 0644);
2769 MODULE_PARM_DESC(send_implementation_id,
2770 "Send implementation ID with NFSv4.1 exchange_id");
2771 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2772 MODULE_ALIAS("nfs4");
2773
2774 #endif /* CONFIG_NFS_V4 */
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