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Merge tag 'for-v3.6' of git://git.infradead.org/battery-2.6
[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/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
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69 #define NFS_TEXT_DATA 1
70
71 #ifdef CONFIG_NFS_V3
72 #define NFS_DEFAULT_VERSION 3
73 #else
74 #define NFS_DEFAULT_VERSION 2
75 #endif
76
77 enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_minorversion,
102
103 /* Mount options that take string arguments */
104 Opt_nfsvers,
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115 };
116
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_udp, "udp" },
137 { Opt_tcp, "tcp" },
138 { Opt_rdma, "rdma" },
139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
147 { Opt_fscache, "fsc" },
148 { Opt_nofscache, "nofsc" },
149
150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
164 { Opt_minorversion, "minorversion=%s" },
165
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
174 { Opt_mounthost, "mounthost=%s" },
175 { Opt_mountaddr, "mountaddr=%s" },
176
177 { Opt_lookupcache, "lookupcache=%s" },
178 { Opt_fscache_uniq, "fsc=%s" },
179 { Opt_local_lock, "local_lock=%s" },
180
181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
184 { Opt_err, NULL }
185 };
186
187 enum {
188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
189
190 Opt_xprt_err
191 };
192
193 static const match_table_t nfs_xprt_protocol_tokens = {
194 { Opt_xprt_udp, "udp" },
195 { Opt_xprt_udp6, "udp6" },
196 { Opt_xprt_tcp, "tcp" },
197 { Opt_xprt_tcp6, "tcp6" },
198 { Opt_xprt_rdma, "rdma" },
199
200 { Opt_xprt_err, NULL }
201 };
202
203 enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210 };
211
212 static const match_table_t nfs_secflavor_tokens = {
213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
229 { Opt_sec_err, NULL }
230 };
231
232 enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237 };
238
239 static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246 };
247
248 enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253 };
254
255 static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262 };
263
264 enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269 };
270
271 static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279 };
280
281 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data);
283
284 static struct file_system_type nfs_fs_type = {
285 .owner = THIS_MODULE,
286 .name = "nfs",
287 .mount = nfs_fs_mount,
288 .kill_sb = nfs_kill_super,
289 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
290 };
291
292 struct file_system_type nfs_xdev_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs",
295 .mount = nfs_xdev_mount,
296 .kill_sb = nfs_kill_super,
297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
298 };
299
300 static const struct super_operations nfs_sops = {
301 .alloc_inode = nfs_alloc_inode,
302 .destroy_inode = nfs_destroy_inode,
303 .write_inode = nfs_write_inode,
304 .put_super = nfs_put_super,
305 .statfs = nfs_statfs,
306 .evict_inode = nfs_evict_inode,
307 .umount_begin = nfs_umount_begin,
308 .show_options = nfs_show_options,
309 .show_devname = nfs_show_devname,
310 .show_path = nfs_show_path,
311 .show_stats = nfs_show_stats,
312 .remount_fs = nfs_remount,
313 };
314
315 #ifdef CONFIG_NFS_V4
316 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
317 static int nfs4_validate_mount_data(void *options,
318 struct nfs_parsed_mount_data *args, const char *dev_name);
319 #endif
320
321 static struct shrinker acl_shrinker = {
322 .shrink = nfs_access_cache_shrinker,
323 .seeks = DEFAULT_SEEKS,
324 };
325
326 /*
327 * Register the NFS filesystems
328 */
329 int __init register_nfs_fs(void)
330 {
331 int ret;
332
333 ret = register_filesystem(&nfs_fs_type);
334 if (ret < 0)
335 goto error_0;
336
337 ret = nfs_register_sysctl();
338 if (ret < 0)
339 goto error_1;
340 register_shrinker(&acl_shrinker);
341 return 0;
342
343 error_1:
344 unregister_filesystem(&nfs_fs_type);
345 error_0:
346 return ret;
347 }
348
349 /*
350 * Unregister the NFS filesystems
351 */
352 void __exit unregister_nfs_fs(void)
353 {
354 unregister_shrinker(&acl_shrinker);
355 nfs_unregister_sysctl();
356 unregister_filesystem(&nfs_fs_type);
357 }
358
359 void nfs_sb_active(struct super_block *sb)
360 {
361 struct nfs_server *server = NFS_SB(sb);
362
363 if (atomic_inc_return(&server->active) == 1)
364 atomic_inc(&sb->s_active);
365 }
366
367 void nfs_sb_deactive(struct super_block *sb)
368 {
369 struct nfs_server *server = NFS_SB(sb);
370
371 if (atomic_dec_and_test(&server->active))
372 deactivate_super(sb);
373 }
374
375 /*
376 * Deliver file system statistics to userspace
377 */
378 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
379 {
380 struct nfs_server *server = NFS_SB(dentry->d_sb);
381 unsigned char blockbits;
382 unsigned long blockres;
383 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
384 struct nfs_fsstat res;
385 int error = -ENOMEM;
386
387 res.fattr = nfs_alloc_fattr();
388 if (res.fattr == NULL)
389 goto out_err;
390
391 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
392 if (unlikely(error == -ESTALE)) {
393 struct dentry *pd_dentry;
394
395 pd_dentry = dget_parent(dentry);
396 if (pd_dentry != NULL) {
397 nfs_zap_caches(pd_dentry->d_inode);
398 dput(pd_dentry);
399 }
400 }
401 nfs_free_fattr(res.fattr);
402 if (error < 0)
403 goto out_err;
404
405 buf->f_type = NFS_SUPER_MAGIC;
406
407 /*
408 * Current versions of glibc do not correctly handle the
409 * case where f_frsize != f_bsize. Eventually we want to
410 * report the value of wtmult in this field.
411 */
412 buf->f_frsize = dentry->d_sb->s_blocksize;
413
414 /*
415 * On most *nix systems, f_blocks, f_bfree, and f_bavail
416 * are reported in units of f_frsize. Linux hasn't had
417 * an f_frsize field in its statfs struct until recently,
418 * thus historically Linux's sys_statfs reports these
419 * fields in units of f_bsize.
420 */
421 buf->f_bsize = dentry->d_sb->s_blocksize;
422 blockbits = dentry->d_sb->s_blocksize_bits;
423 blockres = (1 << blockbits) - 1;
424 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
425 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
426 buf->f_bavail = (res.abytes + blockres) >> blockbits;
427
428 buf->f_files = res.tfiles;
429 buf->f_ffree = res.afiles;
430
431 buf->f_namelen = server->namelen;
432
433 return 0;
434
435 out_err:
436 dprintk("%s: statfs error = %d\n", __func__, -error);
437 return error;
438 }
439
440 /*
441 * Map the security flavour number to a name
442 */
443 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
444 {
445 static const struct {
446 rpc_authflavor_t flavour;
447 const char *str;
448 } sec_flavours[] = {
449 { RPC_AUTH_NULL, "null" },
450 { RPC_AUTH_UNIX, "sys" },
451 { RPC_AUTH_GSS_KRB5, "krb5" },
452 { RPC_AUTH_GSS_KRB5I, "krb5i" },
453 { RPC_AUTH_GSS_KRB5P, "krb5p" },
454 { RPC_AUTH_GSS_LKEY, "lkey" },
455 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
456 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
457 { RPC_AUTH_GSS_SPKM, "spkm" },
458 { RPC_AUTH_GSS_SPKMI, "spkmi" },
459 { RPC_AUTH_GSS_SPKMP, "spkmp" },
460 { UINT_MAX, "unknown" }
461 };
462 int i;
463
464 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
465 if (sec_flavours[i].flavour == flavour)
466 break;
467 }
468 return sec_flavours[i].str;
469 }
470
471 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
472 int showdefaults)
473 {
474 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
475
476 seq_printf(m, ",mountproto=");
477 switch (sap->sa_family) {
478 case AF_INET:
479 switch (nfss->mountd_protocol) {
480 case IPPROTO_UDP:
481 seq_printf(m, RPCBIND_NETID_UDP);
482 break;
483 case IPPROTO_TCP:
484 seq_printf(m, RPCBIND_NETID_TCP);
485 break;
486 default:
487 if (showdefaults)
488 seq_printf(m, "auto");
489 }
490 break;
491 case AF_INET6:
492 switch (nfss->mountd_protocol) {
493 case IPPROTO_UDP:
494 seq_printf(m, RPCBIND_NETID_UDP6);
495 break;
496 case IPPROTO_TCP:
497 seq_printf(m, RPCBIND_NETID_TCP6);
498 break;
499 default:
500 if (showdefaults)
501 seq_printf(m, "auto");
502 }
503 break;
504 default:
505 if (showdefaults)
506 seq_printf(m, "auto");
507 }
508 }
509
510 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
511 int showdefaults)
512 {
513 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
514
515 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
516 return;
517
518 switch (sap->sa_family) {
519 case AF_INET: {
520 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
521 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
522 break;
523 }
524 case AF_INET6: {
525 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
526 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
527 break;
528 }
529 default:
530 if (showdefaults)
531 seq_printf(m, ",mountaddr=unspecified");
532 }
533
534 if (nfss->mountd_version || showdefaults)
535 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
536 if ((nfss->mountd_port &&
537 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
538 showdefaults)
539 seq_printf(m, ",mountport=%u", nfss->mountd_port);
540
541 nfs_show_mountd_netid(m, nfss, showdefaults);
542 }
543
544 #ifdef CONFIG_NFS_V4
545 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
546 int showdefaults)
547 {
548 struct nfs_client *clp = nfss->nfs_client;
549
550 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
551 }
552 #else
553 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
554 int showdefaults)
555 {
556 }
557 #endif
558
559 static void nfs_show_nfs_version(struct seq_file *m,
560 unsigned int version,
561 unsigned int minorversion)
562 {
563 seq_printf(m, ",vers=%u", version);
564 if (version == 4)
565 seq_printf(m, ".%u", minorversion);
566 }
567
568 /*
569 * Describe the mount options in force on this server representation
570 */
571 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
572 int showdefaults)
573 {
574 static const struct proc_nfs_info {
575 int flag;
576 const char *str;
577 const char *nostr;
578 } nfs_info[] = {
579 { NFS_MOUNT_SOFT, ",soft", ",hard" },
580 { NFS_MOUNT_POSIX, ",posix", "" },
581 { NFS_MOUNT_NOCTO, ",nocto", "" },
582 { NFS_MOUNT_NOAC, ",noac", "" },
583 { NFS_MOUNT_NONLM, ",nolock", "" },
584 { NFS_MOUNT_NOACL, ",noacl", "" },
585 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
586 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
587 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
588 { 0, NULL, NULL }
589 };
590 const struct proc_nfs_info *nfs_infop;
591 struct nfs_client *clp = nfss->nfs_client;
592 u32 version = clp->rpc_ops->version;
593 int local_flock, local_fcntl;
594
595 nfs_show_nfs_version(m, version, clp->cl_minorversion);
596 seq_printf(m, ",rsize=%u", nfss->rsize);
597 seq_printf(m, ",wsize=%u", nfss->wsize);
598 if (nfss->bsize != 0)
599 seq_printf(m, ",bsize=%u", nfss->bsize);
600 seq_printf(m, ",namlen=%u", nfss->namelen);
601 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
602 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
603 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
604 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
605 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
606 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
607 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
608 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
609 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
610 if (nfss->flags & nfs_infop->flag)
611 seq_puts(m, nfs_infop->str);
612 else
613 seq_puts(m, nfs_infop->nostr);
614 }
615 rcu_read_lock();
616 seq_printf(m, ",proto=%s",
617 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
618 rcu_read_unlock();
619 if (version == 4) {
620 if (nfss->port != NFS_PORT)
621 seq_printf(m, ",port=%u", nfss->port);
622 } else
623 if (nfss->port)
624 seq_printf(m, ",port=%u", nfss->port);
625
626 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
627 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
628 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
629
630 if (version != 4)
631 nfs_show_mountd_options(m, nfss, showdefaults);
632 else
633 nfs_show_nfsv4_options(m, nfss, showdefaults);
634
635 if (nfss->options & NFS_OPTION_FSCACHE)
636 seq_printf(m, ",fsc");
637
638 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
639 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
640 seq_printf(m, ",lookupcache=none");
641 else
642 seq_printf(m, ",lookupcache=pos");
643 }
644
645 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
646 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
647
648 if (!local_flock && !local_fcntl)
649 seq_printf(m, ",local_lock=none");
650 else if (local_flock && local_fcntl)
651 seq_printf(m, ",local_lock=all");
652 else if (local_flock)
653 seq_printf(m, ",local_lock=flock");
654 else
655 seq_printf(m, ",local_lock=posix");
656 }
657
658 /*
659 * Describe the mount options on this VFS mountpoint
660 */
661 int nfs_show_options(struct seq_file *m, struct dentry *root)
662 {
663 struct nfs_server *nfss = NFS_SB(root->d_sb);
664
665 nfs_show_mount_options(m, nfss, 0);
666
667 rcu_read_lock();
668 seq_printf(m, ",addr=%s",
669 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
670 RPC_DISPLAY_ADDR));
671 rcu_read_unlock();
672
673 return 0;
674 }
675
676 #ifdef CONFIG_NFS_V4
677 #ifdef CONFIG_NFS_V4_1
678 static void show_sessions(struct seq_file *m, struct nfs_server *server)
679 {
680 if (nfs4_has_session(server->nfs_client))
681 seq_printf(m, ",sessions");
682 }
683 #else
684 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
685 #endif
686 #endif
687
688 #ifdef CONFIG_NFS_V4_1
689 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
690 {
691 seq_printf(m, ",pnfs=");
692 if (server->pnfs_curr_ld)
693 seq_printf(m, "%s", server->pnfs_curr_ld->name);
694 else
695 seq_printf(m, "not configured");
696 }
697
698 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
699 {
700 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
701 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
702 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
703 "date='%llu,%u'",
704 impl_id->name, impl_id->domain,
705 impl_id->date.seconds, impl_id->date.nseconds);
706 }
707 }
708 #else
709 #ifdef CONFIG_NFS_V4
710 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
711 {
712 }
713 #endif
714 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
715 {
716 }
717 #endif
718
719 int nfs_show_devname(struct seq_file *m, struct dentry *root)
720 {
721 char *page = (char *) __get_free_page(GFP_KERNEL);
722 char *devname, *dummy;
723 int err = 0;
724 if (!page)
725 return -ENOMEM;
726 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
727 if (IS_ERR(devname))
728 err = PTR_ERR(devname);
729 else
730 seq_escape(m, devname, " \t\n\\");
731 free_page((unsigned long)page);
732 return err;
733 }
734
735 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
736 {
737 seq_puts(m, "/");
738 return 0;
739 }
740
741 /*
742 * Present statistical information for this VFS mountpoint
743 */
744 int nfs_show_stats(struct seq_file *m, struct dentry *root)
745 {
746 int i, cpu;
747 struct nfs_server *nfss = NFS_SB(root->d_sb);
748 struct rpc_auth *auth = nfss->client->cl_auth;
749 struct nfs_iostats totals = { };
750
751 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
752
753 /*
754 * Display all mount option settings
755 */
756 seq_printf(m, "\n\topts:\t");
757 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
758 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
759 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
760 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
761 nfs_show_mount_options(m, nfss, 1);
762
763 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
764
765 show_implementation_id(m, nfss);
766
767 seq_printf(m, "\n\tcaps:\t");
768 seq_printf(m, "caps=0x%x", nfss->caps);
769 seq_printf(m, ",wtmult=%u", nfss->wtmult);
770 seq_printf(m, ",dtsize=%u", nfss->dtsize);
771 seq_printf(m, ",bsize=%u", nfss->bsize);
772 seq_printf(m, ",namlen=%u", nfss->namelen);
773
774 #ifdef CONFIG_NFS_V4
775 if (nfss->nfs_client->rpc_ops->version == 4) {
776 seq_printf(m, "\n\tnfsv4:\t");
777 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
778 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
779 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
780 show_sessions(m, nfss);
781 show_pnfs(m, nfss);
782 }
783 #endif
784
785 /*
786 * Display security flavor in effect for this mount
787 */
788 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
789 if (auth->au_flavor)
790 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
791
792 /*
793 * Display superblock I/O counters
794 */
795 for_each_possible_cpu(cpu) {
796 struct nfs_iostats *stats;
797
798 preempt_disable();
799 stats = per_cpu_ptr(nfss->io_stats, cpu);
800
801 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
802 totals.events[i] += stats->events[i];
803 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
804 totals.bytes[i] += stats->bytes[i];
805 #ifdef CONFIG_NFS_FSCACHE
806 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
807 totals.fscache[i] += stats->fscache[i];
808 #endif
809
810 preempt_enable();
811 }
812
813 seq_printf(m, "\n\tevents:\t");
814 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
815 seq_printf(m, "%lu ", totals.events[i]);
816 seq_printf(m, "\n\tbytes:\t");
817 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
818 seq_printf(m, "%Lu ", totals.bytes[i]);
819 #ifdef CONFIG_NFS_FSCACHE
820 if (nfss->options & NFS_OPTION_FSCACHE) {
821 seq_printf(m, "\n\tfsc:\t");
822 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
823 seq_printf(m, "%Lu ", totals.bytes[i]);
824 }
825 #endif
826 seq_printf(m, "\n");
827
828 rpc_print_iostats(m, nfss->client);
829
830 return 0;
831 }
832
833 /*
834 * Begin unmount by attempting to remove all automounted mountpoints we added
835 * in response to xdev traversals and referrals
836 */
837 void nfs_umount_begin(struct super_block *sb)
838 {
839 struct nfs_server *server;
840 struct rpc_clnt *rpc;
841
842 server = NFS_SB(sb);
843 /* -EIO all pending I/O */
844 rpc = server->client_acl;
845 if (!IS_ERR(rpc))
846 rpc_killall_tasks(rpc);
847 rpc = server->client;
848 if (!IS_ERR(rpc))
849 rpc_killall_tasks(rpc);
850 }
851
852 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
853 {
854 struct nfs_parsed_mount_data *data;
855
856 data = kzalloc(sizeof(*data), GFP_KERNEL);
857 if (data) {
858 data->acregmin = NFS_DEF_ACREGMIN;
859 data->acregmax = NFS_DEF_ACREGMAX;
860 data->acdirmin = NFS_DEF_ACDIRMIN;
861 data->acdirmax = NFS_DEF_ACDIRMAX;
862 data->mount_server.port = NFS_UNSPEC_PORT;
863 data->nfs_server.port = NFS_UNSPEC_PORT;
864 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
865 data->auth_flavors[0] = RPC_AUTH_UNIX;
866 data->auth_flavor_len = 1;
867 data->minorversion = 0;
868 data->need_mount = true;
869 data->net = current->nsproxy->net_ns;
870 security_init_mnt_opts(&data->lsm_opts);
871 }
872 return data;
873 }
874
875 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
876 {
877 if (data) {
878 kfree(data->client_address);
879 kfree(data->mount_server.hostname);
880 kfree(data->nfs_server.export_path);
881 kfree(data->nfs_server.hostname);
882 kfree(data->fscache_uniq);
883 security_free_mnt_opts(&data->lsm_opts);
884 kfree(data);
885 }
886 }
887
888 /*
889 * Sanity-check a server address provided by the mount command.
890 *
891 * Address family must be initialized, and address must not be
892 * the ANY address for that family.
893 */
894 static int nfs_verify_server_address(struct sockaddr *addr)
895 {
896 switch (addr->sa_family) {
897 case AF_INET: {
898 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
899 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
900 }
901 case AF_INET6: {
902 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
903 return !ipv6_addr_any(sa);
904 }
905 }
906
907 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
908 return 0;
909 }
910
911 /*
912 * Select between a default port value and a user-specified port value.
913 * If a zero value is set, then autobind will be used.
914 */
915 static void nfs_set_port(struct sockaddr *sap, int *port,
916 const unsigned short default_port)
917 {
918 if (*port == NFS_UNSPEC_PORT)
919 *port = default_port;
920
921 rpc_set_port(sap, *port);
922 }
923
924 /*
925 * Sanity check the NFS transport protocol.
926 *
927 */
928 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
929 {
930 switch (mnt->nfs_server.protocol) {
931 case XPRT_TRANSPORT_UDP:
932 case XPRT_TRANSPORT_TCP:
933 case XPRT_TRANSPORT_RDMA:
934 break;
935 default:
936 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
937 }
938 }
939
940 /*
941 * For text based NFSv2/v3 mounts, the mount protocol transport default
942 * settings should depend upon the specified NFS transport.
943 */
944 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
945 {
946 nfs_validate_transport_protocol(mnt);
947
948 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
949 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
950 return;
951 switch (mnt->nfs_server.protocol) {
952 case XPRT_TRANSPORT_UDP:
953 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
954 break;
955 case XPRT_TRANSPORT_TCP:
956 case XPRT_TRANSPORT_RDMA:
957 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
958 }
959 }
960
961 /*
962 * Parse the value of the 'sec=' option.
963 */
964 static int nfs_parse_security_flavors(char *value,
965 struct nfs_parsed_mount_data *mnt)
966 {
967 substring_t args[MAX_OPT_ARGS];
968
969 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
970
971 switch (match_token(value, nfs_secflavor_tokens, args)) {
972 case Opt_sec_none:
973 mnt->auth_flavors[0] = RPC_AUTH_NULL;
974 break;
975 case Opt_sec_sys:
976 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
977 break;
978 case Opt_sec_krb5:
979 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
980 break;
981 case Opt_sec_krb5i:
982 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
983 break;
984 case Opt_sec_krb5p:
985 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
986 break;
987 case Opt_sec_lkey:
988 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
989 break;
990 case Opt_sec_lkeyi:
991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
992 break;
993 case Opt_sec_lkeyp:
994 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
995 break;
996 case Opt_sec_spkm:
997 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
998 break;
999 case Opt_sec_spkmi:
1000 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1001 break;
1002 case Opt_sec_spkmp:
1003 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1004 break;
1005 default:
1006 return 0;
1007 }
1008
1009 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1010 mnt->auth_flavor_len = 1;
1011 return 1;
1012 }
1013
1014 static int nfs_parse_version_string(char *string,
1015 struct nfs_parsed_mount_data *mnt,
1016 substring_t *args)
1017 {
1018 mnt->flags &= ~NFS_MOUNT_VER3;
1019 switch (match_token(string, nfs_vers_tokens, args)) {
1020 case Opt_vers_2:
1021 mnt->version = 2;
1022 break;
1023 case Opt_vers_3:
1024 mnt->flags |= NFS_MOUNT_VER3;
1025 mnt->version = 3;
1026 break;
1027 case Opt_vers_4:
1028 /* Backward compatibility option. In future,
1029 * the mount program should always supply
1030 * a NFSv4 minor version number.
1031 */
1032 mnt->version = 4;
1033 break;
1034 case Opt_vers_4_0:
1035 mnt->version = 4;
1036 mnt->minorversion = 0;
1037 break;
1038 case Opt_vers_4_1:
1039 mnt->version = 4;
1040 mnt->minorversion = 1;
1041 break;
1042 default:
1043 return 0;
1044 }
1045 return 1;
1046 }
1047
1048 static int nfs_get_option_str(substring_t args[], char **option)
1049 {
1050 kfree(*option);
1051 *option = match_strdup(args);
1052 return !option;
1053 }
1054
1055 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1056 {
1057 int rc;
1058 char *string;
1059
1060 string = match_strdup(args);
1061 if (string == NULL)
1062 return -ENOMEM;
1063 rc = strict_strtoul(string, 10, option);
1064 kfree(string);
1065
1066 return rc;
1067 }
1068
1069 /*
1070 * Error-check and convert a string of mount options from user space into
1071 * a data structure. The whole mount string is processed; bad options are
1072 * skipped as they are encountered. If there were no errors, return 1;
1073 * otherwise return 0 (zero).
1074 */
1075 static int nfs_parse_mount_options(char *raw,
1076 struct nfs_parsed_mount_data *mnt)
1077 {
1078 char *p, *string, *secdata;
1079 int rc, sloppy = 0, invalid_option = 0;
1080 unsigned short protofamily = AF_UNSPEC;
1081 unsigned short mountfamily = AF_UNSPEC;
1082
1083 if (!raw) {
1084 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1085 return 1;
1086 }
1087 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1088
1089 secdata = alloc_secdata();
1090 if (!secdata)
1091 goto out_nomem;
1092
1093 rc = security_sb_copy_data(raw, secdata);
1094 if (rc)
1095 goto out_security_failure;
1096
1097 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1098 if (rc)
1099 goto out_security_failure;
1100
1101 free_secdata(secdata);
1102
1103 while ((p = strsep(&raw, ",")) != NULL) {
1104 substring_t args[MAX_OPT_ARGS];
1105 unsigned long option;
1106 int token;
1107
1108 if (!*p)
1109 continue;
1110
1111 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1112
1113 token = match_token(p, nfs_mount_option_tokens, args);
1114 switch (token) {
1115
1116 /*
1117 * boolean options: foo/nofoo
1118 */
1119 case Opt_soft:
1120 mnt->flags |= NFS_MOUNT_SOFT;
1121 break;
1122 case Opt_hard:
1123 mnt->flags &= ~NFS_MOUNT_SOFT;
1124 break;
1125 case Opt_posix:
1126 mnt->flags |= NFS_MOUNT_POSIX;
1127 break;
1128 case Opt_noposix:
1129 mnt->flags &= ~NFS_MOUNT_POSIX;
1130 break;
1131 case Opt_cto:
1132 mnt->flags &= ~NFS_MOUNT_NOCTO;
1133 break;
1134 case Opt_nocto:
1135 mnt->flags |= NFS_MOUNT_NOCTO;
1136 break;
1137 case Opt_ac:
1138 mnt->flags &= ~NFS_MOUNT_NOAC;
1139 break;
1140 case Opt_noac:
1141 mnt->flags |= NFS_MOUNT_NOAC;
1142 break;
1143 case Opt_lock:
1144 mnt->flags &= ~NFS_MOUNT_NONLM;
1145 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1146 NFS_MOUNT_LOCAL_FCNTL);
1147 break;
1148 case Opt_nolock:
1149 mnt->flags |= NFS_MOUNT_NONLM;
1150 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1151 NFS_MOUNT_LOCAL_FCNTL);
1152 break;
1153 case Opt_udp:
1154 mnt->flags &= ~NFS_MOUNT_TCP;
1155 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1156 break;
1157 case Opt_tcp:
1158 mnt->flags |= NFS_MOUNT_TCP;
1159 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1160 break;
1161 case Opt_rdma:
1162 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1163 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1164 xprt_load_transport(p);
1165 break;
1166 case Opt_acl:
1167 mnt->flags &= ~NFS_MOUNT_NOACL;
1168 break;
1169 case Opt_noacl:
1170 mnt->flags |= NFS_MOUNT_NOACL;
1171 break;
1172 case Opt_rdirplus:
1173 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1174 break;
1175 case Opt_nordirplus:
1176 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1177 break;
1178 case Opt_sharecache:
1179 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1180 break;
1181 case Opt_nosharecache:
1182 mnt->flags |= NFS_MOUNT_UNSHARED;
1183 break;
1184 case Opt_resvport:
1185 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1186 break;
1187 case Opt_noresvport:
1188 mnt->flags |= NFS_MOUNT_NORESVPORT;
1189 break;
1190 case Opt_fscache:
1191 mnt->options |= NFS_OPTION_FSCACHE;
1192 kfree(mnt->fscache_uniq);
1193 mnt->fscache_uniq = NULL;
1194 break;
1195 case Opt_nofscache:
1196 mnt->options &= ~NFS_OPTION_FSCACHE;
1197 kfree(mnt->fscache_uniq);
1198 mnt->fscache_uniq = NULL;
1199 break;
1200
1201 /*
1202 * options that take numeric values
1203 */
1204 case Opt_port:
1205 if (nfs_get_option_ul(args, &option) ||
1206 option > USHRT_MAX)
1207 goto out_invalid_value;
1208 mnt->nfs_server.port = option;
1209 break;
1210 case Opt_rsize:
1211 if (nfs_get_option_ul(args, &option))
1212 goto out_invalid_value;
1213 mnt->rsize = option;
1214 break;
1215 case Opt_wsize:
1216 if (nfs_get_option_ul(args, &option))
1217 goto out_invalid_value;
1218 mnt->wsize = option;
1219 break;
1220 case Opt_bsize:
1221 if (nfs_get_option_ul(args, &option))
1222 goto out_invalid_value;
1223 mnt->bsize = option;
1224 break;
1225 case Opt_timeo:
1226 if (nfs_get_option_ul(args, &option) || option == 0)
1227 goto out_invalid_value;
1228 mnt->timeo = option;
1229 break;
1230 case Opt_retrans:
1231 if (nfs_get_option_ul(args, &option) || option == 0)
1232 goto out_invalid_value;
1233 mnt->retrans = option;
1234 break;
1235 case Opt_acregmin:
1236 if (nfs_get_option_ul(args, &option))
1237 goto out_invalid_value;
1238 mnt->acregmin = option;
1239 break;
1240 case Opt_acregmax:
1241 if (nfs_get_option_ul(args, &option))
1242 goto out_invalid_value;
1243 mnt->acregmax = option;
1244 break;
1245 case Opt_acdirmin:
1246 if (nfs_get_option_ul(args, &option))
1247 goto out_invalid_value;
1248 mnt->acdirmin = option;
1249 break;
1250 case Opt_acdirmax:
1251 if (nfs_get_option_ul(args, &option))
1252 goto out_invalid_value;
1253 mnt->acdirmax = option;
1254 break;
1255 case Opt_actimeo:
1256 if (nfs_get_option_ul(args, &option))
1257 goto out_invalid_value;
1258 mnt->acregmin = mnt->acregmax =
1259 mnt->acdirmin = mnt->acdirmax = option;
1260 break;
1261 case Opt_namelen:
1262 if (nfs_get_option_ul(args, &option))
1263 goto out_invalid_value;
1264 mnt->namlen = option;
1265 break;
1266 case Opt_mountport:
1267 if (nfs_get_option_ul(args, &option) ||
1268 option > USHRT_MAX)
1269 goto out_invalid_value;
1270 mnt->mount_server.port = option;
1271 break;
1272 case Opt_mountvers:
1273 if (nfs_get_option_ul(args, &option) ||
1274 option < NFS_MNT_VERSION ||
1275 option > NFS_MNT3_VERSION)
1276 goto out_invalid_value;
1277 mnt->mount_server.version = option;
1278 break;
1279 case Opt_minorversion:
1280 if (nfs_get_option_ul(args, &option))
1281 goto out_invalid_value;
1282 if (option > NFS4_MAX_MINOR_VERSION)
1283 goto out_invalid_value;
1284 mnt->minorversion = option;
1285 break;
1286
1287 /*
1288 * options that take text values
1289 */
1290 case Opt_nfsvers:
1291 string = match_strdup(args);
1292 if (string == NULL)
1293 goto out_nomem;
1294 rc = nfs_parse_version_string(string, mnt, args);
1295 kfree(string);
1296 if (!rc)
1297 goto out_invalid_value;
1298 break;
1299 case Opt_sec:
1300 string = match_strdup(args);
1301 if (string == NULL)
1302 goto out_nomem;
1303 rc = nfs_parse_security_flavors(string, mnt);
1304 kfree(string);
1305 if (!rc) {
1306 dfprintk(MOUNT, "NFS: unrecognized "
1307 "security flavor\n");
1308 return 0;
1309 }
1310 break;
1311 case Opt_proto:
1312 string = match_strdup(args);
1313 if (string == NULL)
1314 goto out_nomem;
1315 token = match_token(string,
1316 nfs_xprt_protocol_tokens, args);
1317
1318 protofamily = AF_INET;
1319 switch (token) {
1320 case Opt_xprt_udp6:
1321 protofamily = AF_INET6;
1322 case Opt_xprt_udp:
1323 mnt->flags &= ~NFS_MOUNT_TCP;
1324 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1325 break;
1326 case Opt_xprt_tcp6:
1327 protofamily = AF_INET6;
1328 case Opt_xprt_tcp:
1329 mnt->flags |= NFS_MOUNT_TCP;
1330 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1331 break;
1332 case Opt_xprt_rdma:
1333 /* vector side protocols to TCP */
1334 mnt->flags |= NFS_MOUNT_TCP;
1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1336 xprt_load_transport(string);
1337 break;
1338 default:
1339 dfprintk(MOUNT, "NFS: unrecognized "
1340 "transport protocol\n");
1341 kfree(string);
1342 return 0;
1343 }
1344 kfree(string);
1345 break;
1346 case Opt_mountproto:
1347 string = match_strdup(args);
1348 if (string == NULL)
1349 goto out_nomem;
1350 token = match_token(string,
1351 nfs_xprt_protocol_tokens, args);
1352 kfree(string);
1353
1354 mountfamily = AF_INET;
1355 switch (token) {
1356 case Opt_xprt_udp6:
1357 mountfamily = AF_INET6;
1358 case Opt_xprt_udp:
1359 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1360 break;
1361 case Opt_xprt_tcp6:
1362 mountfamily = AF_INET6;
1363 case Opt_xprt_tcp:
1364 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1365 break;
1366 case Opt_xprt_rdma: /* not used for side protocols */
1367 default:
1368 dfprintk(MOUNT, "NFS: unrecognized "
1369 "transport protocol\n");
1370 return 0;
1371 }
1372 break;
1373 case Opt_addr:
1374 string = match_strdup(args);
1375 if (string == NULL)
1376 goto out_nomem;
1377 mnt->nfs_server.addrlen =
1378 rpc_pton(mnt->net, string, strlen(string),
1379 (struct sockaddr *)
1380 &mnt->nfs_server.address,
1381 sizeof(mnt->nfs_server.address));
1382 kfree(string);
1383 if (mnt->nfs_server.addrlen == 0)
1384 goto out_invalid_address;
1385 break;
1386 case Opt_clientaddr:
1387 if (nfs_get_option_str(args, &mnt->client_address))
1388 goto out_nomem;
1389 break;
1390 case Opt_mounthost:
1391 if (nfs_get_option_str(args,
1392 &mnt->mount_server.hostname))
1393 goto out_nomem;
1394 break;
1395 case Opt_mountaddr:
1396 string = match_strdup(args);
1397 if (string == NULL)
1398 goto out_nomem;
1399 mnt->mount_server.addrlen =
1400 rpc_pton(mnt->net, string, strlen(string),
1401 (struct sockaddr *)
1402 &mnt->mount_server.address,
1403 sizeof(mnt->mount_server.address));
1404 kfree(string);
1405 if (mnt->mount_server.addrlen == 0)
1406 goto out_invalid_address;
1407 break;
1408 case Opt_lookupcache:
1409 string = match_strdup(args);
1410 if (string == NULL)
1411 goto out_nomem;
1412 token = match_token(string,
1413 nfs_lookupcache_tokens, args);
1414 kfree(string);
1415 switch (token) {
1416 case Opt_lookupcache_all:
1417 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1418 break;
1419 case Opt_lookupcache_positive:
1420 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1421 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1422 break;
1423 case Opt_lookupcache_none:
1424 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1425 break;
1426 default:
1427 dfprintk(MOUNT, "NFS: invalid "
1428 "lookupcache argument\n");
1429 return 0;
1430 };
1431 break;
1432 case Opt_fscache_uniq:
1433 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1434 goto out_nomem;
1435 mnt->options |= NFS_OPTION_FSCACHE;
1436 break;
1437 case Opt_local_lock:
1438 string = match_strdup(args);
1439 if (string == NULL)
1440 goto out_nomem;
1441 token = match_token(string, nfs_local_lock_tokens,
1442 args);
1443 kfree(string);
1444 switch (token) {
1445 case Opt_local_lock_all:
1446 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1447 NFS_MOUNT_LOCAL_FCNTL);
1448 break;
1449 case Opt_local_lock_flock:
1450 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1451 break;
1452 case Opt_local_lock_posix:
1453 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1454 break;
1455 case Opt_local_lock_none:
1456 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1457 NFS_MOUNT_LOCAL_FCNTL);
1458 break;
1459 default:
1460 dfprintk(MOUNT, "NFS: invalid "
1461 "local_lock argument\n");
1462 return 0;
1463 };
1464 break;
1465
1466 /*
1467 * Special options
1468 */
1469 case Opt_sloppy:
1470 sloppy = 1;
1471 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1472 break;
1473 case Opt_userspace:
1474 case Opt_deprecated:
1475 dfprintk(MOUNT, "NFS: ignoring mount option "
1476 "'%s'\n", p);
1477 break;
1478
1479 default:
1480 invalid_option = 1;
1481 dfprintk(MOUNT, "NFS: unrecognized mount option "
1482 "'%s'\n", p);
1483 }
1484 }
1485
1486 if (!sloppy && invalid_option)
1487 return 0;
1488
1489 if (mnt->minorversion && mnt->version != 4)
1490 goto out_minorversion_mismatch;
1491
1492 /*
1493 * verify that any proto=/mountproto= options match the address
1494 * familiies in the addr=/mountaddr= options.
1495 */
1496 if (protofamily != AF_UNSPEC &&
1497 protofamily != mnt->nfs_server.address.ss_family)
1498 goto out_proto_mismatch;
1499
1500 if (mountfamily != AF_UNSPEC) {
1501 if (mnt->mount_server.addrlen) {
1502 if (mountfamily != mnt->mount_server.address.ss_family)
1503 goto out_mountproto_mismatch;
1504 } else {
1505 if (mountfamily != mnt->nfs_server.address.ss_family)
1506 goto out_mountproto_mismatch;
1507 }
1508 }
1509
1510 return 1;
1511
1512 out_mountproto_mismatch:
1513 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1514 "option\n");
1515 return 0;
1516 out_proto_mismatch:
1517 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1518 return 0;
1519 out_invalid_address:
1520 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1521 return 0;
1522 out_invalid_value:
1523 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1524 return 0;
1525 out_minorversion_mismatch:
1526 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1527 "minorversion=%u\n", mnt->version, mnt->minorversion);
1528 return 0;
1529 out_nomem:
1530 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1531 return 0;
1532 out_security_failure:
1533 free_secdata(secdata);
1534 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1535 return 0;
1536 }
1537
1538 /*
1539 * Match the requested auth flavors with the list returned by
1540 * the server. Returns zero and sets the mount's authentication
1541 * flavor on success; returns -EACCES if server does not support
1542 * the requested flavor.
1543 */
1544 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1545 struct nfs_mount_request *request)
1546 {
1547 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1548
1549 /*
1550 * Certain releases of Linux's mountd return an empty
1551 * flavor list. To prevent behavioral regression with
1552 * these servers (ie. rejecting mounts that used to
1553 * succeed), revert to pre-2.6.32 behavior (no checking)
1554 * if the returned flavor list is empty.
1555 */
1556 if (server_authlist_len == 0)
1557 return 0;
1558
1559 /*
1560 * We avoid sophisticated negotiating here, as there are
1561 * plenty of cases where we can get it wrong, providing
1562 * either too little or too much security.
1563 *
1564 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1565 * flavor listed first. However, some servers list
1566 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1567 * preferred default, in args->auth_flavors[0] if user
1568 * didn't specify sec= mount option.
1569 */
1570 for (i = 0; i < args->auth_flavor_len; i++)
1571 for (j = 0; j < server_authlist_len; j++)
1572 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1573 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1574 request->auth_flavs[j]);
1575 args->auth_flavors[0] = request->auth_flavs[j];
1576 return 0;
1577 }
1578
1579 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1580 nfs_umount(request);
1581 return -EACCES;
1582 }
1583
1584 /*
1585 * Use the remote server's MOUNT service to request the NFS file handle
1586 * corresponding to the provided path.
1587 */
1588 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1589 struct nfs_fh *root_fh)
1590 {
1591 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1592 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1593 struct nfs_mount_request request = {
1594 .sap = (struct sockaddr *)
1595 &args->mount_server.address,
1596 .dirpath = args->nfs_server.export_path,
1597 .protocol = args->mount_server.protocol,
1598 .fh = root_fh,
1599 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1600 .auth_flav_len = &server_authlist_len,
1601 .auth_flavs = server_authlist,
1602 .net = args->net,
1603 };
1604 int status;
1605
1606 if (args->mount_server.version == 0) {
1607 switch (args->version) {
1608 default:
1609 args->mount_server.version = NFS_MNT3_VERSION;
1610 break;
1611 case 2:
1612 args->mount_server.version = NFS_MNT_VERSION;
1613 }
1614 }
1615 request.version = args->mount_server.version;
1616
1617 if (args->mount_server.hostname)
1618 request.hostname = args->mount_server.hostname;
1619 else
1620 request.hostname = args->nfs_server.hostname;
1621
1622 /*
1623 * Construct the mount server's address.
1624 */
1625 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1626 memcpy(request.sap, &args->nfs_server.address,
1627 args->nfs_server.addrlen);
1628 args->mount_server.addrlen = args->nfs_server.addrlen;
1629 }
1630 request.salen = args->mount_server.addrlen;
1631 nfs_set_port(request.sap, &args->mount_server.port, 0);
1632
1633 /*
1634 * Now ask the mount server to map our export path
1635 * to a file handle.
1636 */
1637 status = nfs_mount(&request);
1638 if (status != 0) {
1639 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1640 request.hostname, status);
1641 return status;
1642 }
1643
1644 /*
1645 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1646 */
1647 if (args->mount_server.version != NFS_MNT3_VERSION)
1648 return 0;
1649 return nfs_walk_authlist(args, &request);
1650 }
1651
1652 static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1653 struct nfs_mount_info *mount_info)
1654 {
1655 int status;
1656 struct nfs_server *server;
1657
1658 if (mount_info->parsed->need_mount) {
1659 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1660 if (status)
1661 return ERR_PTR(status);
1662 }
1663
1664 /* Get a volume representation */
1665 server = nfs_create_server(mount_info->parsed, mount_info->mntfh);
1666 if (IS_ERR(server))
1667 return ERR_CAST(server);
1668
1669 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info);
1670 }
1671
1672 /*
1673 * Split "dev_name" into "hostname:export_path".
1674 *
1675 * The leftmost colon demarks the split between the server's hostname
1676 * and the export path. If the hostname starts with a left square
1677 * bracket, then it may contain colons.
1678 *
1679 * Note: caller frees hostname and export path, even on error.
1680 */
1681 static int nfs_parse_devname(const char *dev_name,
1682 char **hostname, size_t maxnamlen,
1683 char **export_path, size_t maxpathlen)
1684 {
1685 size_t len;
1686 char *end;
1687
1688 /* Is the host name protected with square brakcets? */
1689 if (*dev_name == '[') {
1690 end = strchr(++dev_name, ']');
1691 if (end == NULL || end[1] != ':')
1692 goto out_bad_devname;
1693
1694 len = end - dev_name;
1695 end++;
1696 } else {
1697 char *comma;
1698
1699 end = strchr(dev_name, ':');
1700 if (end == NULL)
1701 goto out_bad_devname;
1702 len = end - dev_name;
1703
1704 /* kill possible hostname list: not supported */
1705 comma = strchr(dev_name, ',');
1706 if (comma != NULL && comma < end)
1707 *comma = 0;
1708 }
1709
1710 if (len > maxnamlen)
1711 goto out_hostname;
1712
1713 /* N.B. caller will free nfs_server.hostname in all cases */
1714 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1715 if (*hostname == NULL)
1716 goto out_nomem;
1717 len = strlen(++end);
1718 if (len > maxpathlen)
1719 goto out_path;
1720 *export_path = kstrndup(end, len, GFP_KERNEL);
1721 if (!*export_path)
1722 goto out_nomem;
1723
1724 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1725 return 0;
1726
1727 out_bad_devname:
1728 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1729 return -EINVAL;
1730
1731 out_nomem:
1732 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1733 return -ENOMEM;
1734
1735 out_hostname:
1736 dfprintk(MOUNT, "NFS: server hostname too long\n");
1737 return -ENAMETOOLONG;
1738
1739 out_path:
1740 dfprintk(MOUNT, "NFS: export pathname too long\n");
1741 return -ENAMETOOLONG;
1742 }
1743
1744 /*
1745 * Validate the NFS2/NFS3 mount data
1746 * - fills in the mount root filehandle
1747 *
1748 * For option strings, user space handles the following behaviors:
1749 *
1750 * + DNS: mapping server host name to IP address ("addr=" option)
1751 *
1752 * + failure mode: how to behave if a mount request can't be handled
1753 * immediately ("fg/bg" option)
1754 *
1755 * + retry: how often to retry a mount request ("retry=" option)
1756 *
1757 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1758 * mountproto=tcp after mountproto=udp, and so on
1759 */
1760 static int nfs23_validate_mount_data(void *options,
1761 struct nfs_parsed_mount_data *args,
1762 struct nfs_fh *mntfh,
1763 const char *dev_name)
1764 {
1765 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1766 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1767
1768 if (data == NULL)
1769 goto out_no_data;
1770
1771 args->version = NFS_DEFAULT_VERSION;
1772 switch (data->version) {
1773 case 1:
1774 data->namlen = 0;
1775 case 2:
1776 data->bsize = 0;
1777 case 3:
1778 if (data->flags & NFS_MOUNT_VER3)
1779 goto out_no_v3;
1780 data->root.size = NFS2_FHSIZE;
1781 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1782 case 4:
1783 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1784 goto out_no_sec;
1785 case 5:
1786 memset(data->context, 0, sizeof(data->context));
1787 case 6:
1788 if (data->flags & NFS_MOUNT_VER3) {
1789 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1790 goto out_invalid_fh;
1791 mntfh->size = data->root.size;
1792 args->version = 3;
1793 } else {
1794 mntfh->size = NFS2_FHSIZE;
1795 args->version = 2;
1796 }
1797
1798
1799 memcpy(mntfh->data, data->root.data, mntfh->size);
1800 if (mntfh->size < sizeof(mntfh->data))
1801 memset(mntfh->data + mntfh->size, 0,
1802 sizeof(mntfh->data) - mntfh->size);
1803
1804 /*
1805 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1806 * can deal with.
1807 */
1808 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1809 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1810 args->rsize = data->rsize;
1811 args->wsize = data->wsize;
1812 args->timeo = data->timeo;
1813 args->retrans = data->retrans;
1814 args->acregmin = data->acregmin;
1815 args->acregmax = data->acregmax;
1816 args->acdirmin = data->acdirmin;
1817 args->acdirmax = data->acdirmax;
1818 args->need_mount = false;
1819
1820 memcpy(sap, &data->addr, sizeof(data->addr));
1821 args->nfs_server.addrlen = sizeof(data->addr);
1822 if (!nfs_verify_server_address(sap))
1823 goto out_no_address;
1824
1825 if (!(data->flags & NFS_MOUNT_TCP))
1826 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1827 /* N.B. caller will free nfs_server.hostname in all cases */
1828 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1829 args->namlen = data->namlen;
1830 args->bsize = data->bsize;
1831
1832 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1833 args->auth_flavors[0] = data->pseudoflavor;
1834 if (!args->nfs_server.hostname)
1835 goto out_nomem;
1836
1837 if (!(data->flags & NFS_MOUNT_NONLM))
1838 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1839 NFS_MOUNT_LOCAL_FCNTL);
1840 else
1841 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1842 NFS_MOUNT_LOCAL_FCNTL);
1843 /*
1844 * The legacy version 6 binary mount data from userspace has a
1845 * field used only to transport selinux information into the
1846 * the kernel. To continue to support that functionality we
1847 * have a touch of selinux knowledge here in the NFS code. The
1848 * userspace code converted context=blah to just blah so we are
1849 * converting back to the full string selinux understands.
1850 */
1851 if (data->context[0]){
1852 #ifdef CONFIG_SECURITY_SELINUX
1853 int rc;
1854 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1855 if (!opts_str)
1856 return -ENOMEM;
1857 strcpy(opts_str, "context=");
1858 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1859 strcat(opts_str, &data->context[0]);
1860 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1861 kfree(opts_str);
1862 if (rc)
1863 return rc;
1864 #else
1865 return -EINVAL;
1866 #endif
1867 }
1868
1869 break;
1870 default:
1871 return NFS_TEXT_DATA;
1872 }
1873
1874 #ifndef CONFIG_NFS_V3
1875 if (args->version == 3)
1876 goto out_v3_not_compiled;
1877 #endif /* !CONFIG_NFS_V3 */
1878
1879 return 0;
1880
1881 out_no_data:
1882 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1883 return -EINVAL;
1884
1885 out_no_v3:
1886 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1887 data->version);
1888 return -EINVAL;
1889
1890 out_no_sec:
1891 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1892 return -EINVAL;
1893
1894 #ifndef CONFIG_NFS_V3
1895 out_v3_not_compiled:
1896 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1897 return -EPROTONOSUPPORT;
1898 #endif /* !CONFIG_NFS_V3 */
1899
1900 out_nomem:
1901 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1902 return -ENOMEM;
1903
1904 out_no_address:
1905 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1906 return -EINVAL;
1907
1908 out_invalid_fh:
1909 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1910 return -EINVAL;
1911 }
1912
1913 #ifdef CONFIG_NFS_V4
1914 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1915 void *options,
1916 struct nfs_parsed_mount_data *args,
1917 struct nfs_fh *mntfh,
1918 const char *dev_name)
1919 {
1920 if (fs_type == &nfs_fs_type)
1921 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1922 return nfs4_validate_mount_data(options, args, dev_name);
1923 }
1924 #else
1925 static int nfs_validate_mount_data(struct file_system_type *fs_type,
1926 void *options,
1927 struct nfs_parsed_mount_data *args,
1928 struct nfs_fh *mntfh,
1929 const char *dev_name)
1930 {
1931 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
1932 }
1933 #endif
1934
1935 static int nfs_validate_text_mount_data(void *options,
1936 struct nfs_parsed_mount_data *args,
1937 const char *dev_name)
1938 {
1939 int port = 0;
1940 int max_namelen = PAGE_SIZE;
1941 int max_pathlen = NFS_MAXPATHLEN;
1942 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1943
1944 if (nfs_parse_mount_options((char *)options, args) == 0)
1945 return -EINVAL;
1946
1947 if (!nfs_verify_server_address(sap))
1948 goto out_no_address;
1949
1950 if (args->version == 4) {
1951 #ifdef CONFIG_NFS_V4
1952 port = NFS_PORT;
1953 max_namelen = NFS4_MAXNAMLEN;
1954 max_pathlen = NFS4_MAXPATHLEN;
1955 nfs_validate_transport_protocol(args);
1956 nfs4_validate_mount_flags(args);
1957 #else
1958 goto out_v4_not_compiled;
1959 #endif /* CONFIG_NFS_V4 */
1960 } else
1961 nfs_set_mount_transport_protocol(args);
1962
1963 nfs_set_port(sap, &args->nfs_server.port, port);
1964
1965 if (args->auth_flavor_len > 1)
1966 goto out_bad_auth;
1967
1968 return nfs_parse_devname(dev_name,
1969 &args->nfs_server.hostname,
1970 max_namelen,
1971 &args->nfs_server.export_path,
1972 max_pathlen);
1973
1974 #ifndef CONFIG_NFS_V4
1975 out_v4_not_compiled:
1976 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1977 return -EPROTONOSUPPORT;
1978 #endif /* !CONFIG_NFS_V4 */
1979
1980 out_no_address:
1981 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1982 return -EINVAL;
1983
1984 out_bad_auth:
1985 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
1986 return -EINVAL;
1987 }
1988
1989 static int
1990 nfs_compare_remount_data(struct nfs_server *nfss,
1991 struct nfs_parsed_mount_data *data)
1992 {
1993 if (data->flags != nfss->flags ||
1994 data->rsize != nfss->rsize ||
1995 data->wsize != nfss->wsize ||
1996 data->retrans != nfss->client->cl_timeout->to_retries ||
1997 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1998 data->acregmin != nfss->acregmin / HZ ||
1999 data->acregmax != nfss->acregmax / HZ ||
2000 data->acdirmin != nfss->acdirmin / HZ ||
2001 data->acdirmax != nfss->acdirmax / HZ ||
2002 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2003 data->nfs_server.port != nfss->port ||
2004 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2005 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2006 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2007 return -EINVAL;
2008
2009 return 0;
2010 }
2011
2012 int
2013 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2014 {
2015 int error;
2016 struct nfs_server *nfss = sb->s_fs_info;
2017 struct nfs_parsed_mount_data *data;
2018 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2019 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2020 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2021
2022 /*
2023 * Userspace mount programs that send binary options generally send
2024 * them populated with default values. We have no way to know which
2025 * ones were explicitly specified. Fall back to legacy behavior and
2026 * just return success.
2027 */
2028 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2029 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2030 options->version <= 6))))
2031 return 0;
2032
2033 data = kzalloc(sizeof(*data), GFP_KERNEL);
2034 if (data == NULL)
2035 return -ENOMEM;
2036
2037 /* fill out struct with values from existing mount */
2038 data->flags = nfss->flags;
2039 data->rsize = nfss->rsize;
2040 data->wsize = nfss->wsize;
2041 data->retrans = nfss->client->cl_timeout->to_retries;
2042 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2043 data->acregmin = nfss->acregmin / HZ;
2044 data->acregmax = nfss->acregmax / HZ;
2045 data->acdirmin = nfss->acdirmin / HZ;
2046 data->acdirmax = nfss->acdirmax / HZ;
2047 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2048 data->nfs_server.port = nfss->port;
2049 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2050 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2051 data->nfs_server.addrlen);
2052
2053 /* overwrite those values with any that were specified */
2054 error = nfs_parse_mount_options((char *)options, data);
2055 if (error < 0)
2056 goto out;
2057
2058 /*
2059 * noac is a special case. It implies -o sync, but that's not
2060 * necessarily reflected in the mtab options. do_remount_sb
2061 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2062 * remount options, so we have to explicitly reset it.
2063 */
2064 if (data->flags & NFS_MOUNT_NOAC)
2065 *flags |= MS_SYNCHRONOUS;
2066
2067 /* compare new mount options with old ones */
2068 error = nfs_compare_remount_data(nfss, data);
2069 out:
2070 kfree(data);
2071 return error;
2072 }
2073
2074 /*
2075 * Initialise the common bits of the superblock
2076 */
2077 inline void nfs_initialise_sb(struct super_block *sb)
2078 {
2079 struct nfs_server *server = NFS_SB(sb);
2080
2081 sb->s_magic = NFS_SUPER_MAGIC;
2082
2083 /* We probably want something more informative here */
2084 snprintf(sb->s_id, sizeof(sb->s_id),
2085 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2086
2087 if (sb->s_blocksize == 0)
2088 sb->s_blocksize = nfs_block_bits(server->wsize,
2089 &sb->s_blocksize_bits);
2090
2091 sb->s_bdi = &server->backing_dev_info;
2092
2093 nfs_super_set_maxbytes(sb, server->maxfilesize);
2094 }
2095
2096 /*
2097 * Finish setting up an NFS2/3 superblock
2098 */
2099 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2100 {
2101 struct nfs_parsed_mount_data *data = mount_info->parsed;
2102 struct nfs_server *server = NFS_SB(sb);
2103
2104 sb->s_blocksize_bits = 0;
2105 sb->s_blocksize = 0;
2106 if (data->bsize)
2107 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2108
2109 if (server->nfs_client->rpc_ops->version == 3) {
2110 /* The VFS shouldn't apply the umask to mode bits. We will do
2111 * so ourselves when necessary.
2112 */
2113 sb->s_flags |= MS_POSIXACL;
2114 sb->s_time_gran = 1;
2115 }
2116
2117 sb->s_op = &nfs_sops;
2118 nfs_initialise_sb(sb);
2119 }
2120
2121 /*
2122 * Finish setting up a cloned NFS2/3/4 superblock
2123 */
2124 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2125 {
2126 const struct super_block *old_sb = mount_info->cloned->sb;
2127 struct nfs_server *server = NFS_SB(sb);
2128
2129 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2130 sb->s_blocksize = old_sb->s_blocksize;
2131 sb->s_maxbytes = old_sb->s_maxbytes;
2132 sb->s_xattr = old_sb->s_xattr;
2133 sb->s_op = old_sb->s_op;
2134 sb->s_time_gran = 1;
2135
2136 if (server->nfs_client->rpc_ops->version != 2) {
2137 /* The VFS shouldn't apply the umask to mode bits. We will do
2138 * so ourselves when necessary.
2139 */
2140 sb->s_flags |= MS_POSIXACL;
2141 }
2142
2143 nfs_initialise_sb(sb);
2144 }
2145
2146 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2147 {
2148 const struct nfs_server *a = s->s_fs_info;
2149 const struct rpc_clnt *clnt_a = a->client;
2150 const struct rpc_clnt *clnt_b = b->client;
2151
2152 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2153 goto Ebusy;
2154 if (a->nfs_client != b->nfs_client)
2155 goto Ebusy;
2156 if (a->flags != b->flags)
2157 goto Ebusy;
2158 if (a->wsize != b->wsize)
2159 goto Ebusy;
2160 if (a->rsize != b->rsize)
2161 goto Ebusy;
2162 if (a->acregmin != b->acregmin)
2163 goto Ebusy;
2164 if (a->acregmax != b->acregmax)
2165 goto Ebusy;
2166 if (a->acdirmin != b->acdirmin)
2167 goto Ebusy;
2168 if (a->acdirmax != b->acdirmax)
2169 goto Ebusy;
2170 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2171 goto Ebusy;
2172 return 1;
2173 Ebusy:
2174 return 0;
2175 }
2176
2177 struct nfs_sb_mountdata {
2178 struct nfs_server *server;
2179 int mntflags;
2180 };
2181
2182 static int nfs_set_super(struct super_block *s, void *data)
2183 {
2184 struct nfs_sb_mountdata *sb_mntdata = data;
2185 struct nfs_server *server = sb_mntdata->server;
2186 int ret;
2187
2188 s->s_flags = sb_mntdata->mntflags;
2189 s->s_fs_info = server;
2190 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2191 ret = set_anon_super(s, server);
2192 if (ret == 0)
2193 server->s_dev = s->s_dev;
2194 return ret;
2195 }
2196
2197 static int nfs_compare_super_address(struct nfs_server *server1,
2198 struct nfs_server *server2)
2199 {
2200 struct sockaddr *sap1, *sap2;
2201
2202 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2203 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2204
2205 if (sap1->sa_family != sap2->sa_family)
2206 return 0;
2207
2208 switch (sap1->sa_family) {
2209 case AF_INET: {
2210 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2211 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2212 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2213 return 0;
2214 if (sin1->sin_port != sin2->sin_port)
2215 return 0;
2216 break;
2217 }
2218 case AF_INET6: {
2219 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2220 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2221 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2222 return 0;
2223 if (sin1->sin6_port != sin2->sin6_port)
2224 return 0;
2225 break;
2226 }
2227 default:
2228 return 0;
2229 }
2230
2231 return 1;
2232 }
2233
2234 static int nfs_compare_super(struct super_block *sb, void *data)
2235 {
2236 struct nfs_sb_mountdata *sb_mntdata = data;
2237 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2238 int mntflags = sb_mntdata->mntflags;
2239
2240 if (!nfs_compare_super_address(old, server))
2241 return 0;
2242 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2243 if (old->flags & NFS_MOUNT_UNSHARED)
2244 return 0;
2245 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2246 return 0;
2247 return nfs_compare_mount_options(sb, server, mntflags);
2248 }
2249
2250 #ifdef CONFIG_NFS_FSCACHE
2251 static void nfs_get_cache_cookie(struct super_block *sb,
2252 struct nfs_parsed_mount_data *parsed,
2253 struct nfs_clone_mount *cloned)
2254 {
2255 char *uniq = NULL;
2256 int ulen = 0;
2257
2258 if (parsed && parsed->fscache_uniq) {
2259 uniq = parsed->fscache_uniq;
2260 ulen = strlen(parsed->fscache_uniq);
2261 } else if (cloned) {
2262 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2263 if (mnt_s->fscache_key) {
2264 uniq = mnt_s->fscache_key->key.uniquifier;
2265 ulen = mnt_s->fscache_key->key.uniq_len;
2266 };
2267 }
2268
2269 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2270 }
2271 #else
2272 static void nfs_get_cache_cookie(struct super_block *sb,
2273 struct nfs_parsed_mount_data *parsed,
2274 struct nfs_clone_mount *cloned)
2275 {
2276 }
2277 #endif
2278
2279 static int nfs_bdi_register(struct nfs_server *server)
2280 {
2281 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2282 }
2283
2284 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2285 struct nfs_mount_info *mount_info)
2286 {
2287 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2288 }
2289
2290 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2291 struct nfs_mount_info *mount_info)
2292 {
2293 /* clone any lsm security options from the parent to the new sb */
2294 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2295 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2296 return -ESTALE;
2297 return 0;
2298 }
2299
2300 struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2301 struct nfs_server *server,
2302 int flags, const char *dev_name,
2303 struct nfs_mount_info *mount_info)
2304 {
2305 struct super_block *s;
2306 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2307 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2308 struct nfs_sb_mountdata sb_mntdata = {
2309 .mntflags = flags,
2310 .server = server,
2311 };
2312 int error;
2313
2314 if (server->flags & NFS_MOUNT_UNSHARED)
2315 compare_super = NULL;
2316
2317 /* -o noac implies -o sync */
2318 if (server->flags & NFS_MOUNT_NOAC)
2319 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2320
2321 /* Get a superblock - note that we may end up sharing one that already exists */
2322 s = sget(fs_type, compare_super, nfs_set_super, flags, &sb_mntdata);
2323 if (IS_ERR(s)) {
2324 mntroot = ERR_CAST(s);
2325 goto out_err_nosb;
2326 }
2327
2328 if (s->s_fs_info != server) {
2329 nfs_free_server(server);
2330 server = NULL;
2331 } else {
2332 error = nfs_bdi_register(server);
2333 if (error) {
2334 mntroot = ERR_PTR(error);
2335 goto error_splat_bdi;
2336 }
2337 }
2338
2339 if (!s->s_root) {
2340 /* initial superblock/root creation */
2341 mount_info->fill_super(s, mount_info);
2342 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2343 }
2344
2345 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2346 if (IS_ERR(mntroot))
2347 goto error_splat_super;
2348
2349 error = mount_info->set_security(s, mntroot, mount_info);
2350 if (error)
2351 goto error_splat_root;
2352
2353 s->s_flags |= MS_ACTIVE;
2354
2355 out:
2356 return mntroot;
2357
2358 out_err_nosb:
2359 nfs_free_server(server);
2360 goto out;
2361
2362 error_splat_root:
2363 dput(mntroot);
2364 mntroot = ERR_PTR(error);
2365 error_splat_super:
2366 if (server && !s->s_root)
2367 bdi_unregister(&server->backing_dev_info);
2368 error_splat_bdi:
2369 deactivate_locked_super(s);
2370 goto out;
2371 }
2372
2373 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2374 int flags, const char *dev_name, void *raw_data)
2375 {
2376 struct nfs_mount_info mount_info = {
2377 .fill_super = nfs_fill_super,
2378 .set_security = nfs_set_sb_security,
2379 };
2380 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2381 int error;
2382
2383 mount_info.parsed = nfs_alloc_parsed_mount_data();
2384 mount_info.mntfh = nfs_alloc_fhandle();
2385 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2386 goto out;
2387
2388 /* Validate the mount data */
2389 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2390 if (error == NFS_TEXT_DATA)
2391 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2392 if (error < 0) {
2393 mntroot = ERR_PTR(error);
2394 goto out;
2395 }
2396
2397 #ifdef CONFIG_NFS_V4
2398 if (mount_info.parsed->version == 4)
2399 mntroot = nfs4_try_mount(flags, dev_name, &mount_info);
2400 else
2401 #endif /* CONFIG_NFS_V4 */
2402 mntroot = nfs_try_mount(flags, dev_name, &mount_info);
2403
2404 out:
2405 nfs_free_parsed_mount_data(mount_info.parsed);
2406 nfs_free_fhandle(mount_info.mntfh);
2407 return mntroot;
2408 }
2409
2410 /*
2411 * Ensure that we unregister the bdi before kill_anon_super
2412 * releases the device name
2413 */
2414 void nfs_put_super(struct super_block *s)
2415 {
2416 struct nfs_server *server = NFS_SB(s);
2417
2418 bdi_unregister(&server->backing_dev_info);
2419 }
2420
2421 /*
2422 * Destroy an NFS2/3 superblock
2423 */
2424 void nfs_kill_super(struct super_block *s)
2425 {
2426 struct nfs_server *server = NFS_SB(s);
2427
2428 kill_anon_super(s);
2429 nfs_fscache_release_super_cookie(s);
2430 nfs_free_server(server);
2431 }
2432
2433 /*
2434 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2435 */
2436 struct dentry *
2437 nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2438 const char *dev_name, struct nfs_mount_info *mount_info)
2439 {
2440 struct nfs_clone_mount *data = mount_info->cloned;
2441 struct nfs_server *server;
2442 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2443 int error;
2444
2445 dprintk("--> nfs_xdev_mount_common()\n");
2446
2447 mount_info->mntfh = data->fh;
2448
2449 /* create a new volume representation */
2450 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2451 if (IS_ERR(server)) {
2452 error = PTR_ERR(server);
2453 goto out_err;
2454 }
2455
2456 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2457 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2458 out:
2459 return mntroot;
2460
2461 out_err:
2462 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2463 goto out;
2464 }
2465
2466 /*
2467 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2468 */
2469 static struct dentry *
2470 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2471 const char *dev_name, void *raw_data)
2472 {
2473 struct nfs_mount_info mount_info = {
2474 .fill_super = nfs_clone_super,
2475 .set_security = nfs_clone_sb_security,
2476 .cloned = raw_data,
2477 };
2478 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2479 }
2480
2481 #ifdef CONFIG_NFS_V4
2482
2483 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2484 {
2485 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2486 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2487 }
2488
2489 /*
2490 * Validate NFSv4 mount options
2491 */
2492 static int nfs4_validate_mount_data(void *options,
2493 struct nfs_parsed_mount_data *args,
2494 const char *dev_name)
2495 {
2496 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2497 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2498 char *c;
2499
2500 if (data == NULL)
2501 goto out_no_data;
2502
2503 args->version = 4;
2504
2505 switch (data->version) {
2506 case 1:
2507 if (data->host_addrlen > sizeof(args->nfs_server.address))
2508 goto out_no_address;
2509 if (data->host_addrlen == 0)
2510 goto out_no_address;
2511 args->nfs_server.addrlen = data->host_addrlen;
2512 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2513 return -EFAULT;
2514 if (!nfs_verify_server_address(sap))
2515 goto out_no_address;
2516
2517 if (data->auth_flavourlen) {
2518 if (data->auth_flavourlen > 1)
2519 goto out_inval_auth;
2520 if (copy_from_user(&args->auth_flavors[0],
2521 data->auth_flavours,
2522 sizeof(args->auth_flavors[0])))
2523 return -EFAULT;
2524 }
2525
2526 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2527 if (IS_ERR(c))
2528 return PTR_ERR(c);
2529 args->nfs_server.hostname = c;
2530
2531 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2532 if (IS_ERR(c))
2533 return PTR_ERR(c);
2534 args->nfs_server.export_path = c;
2535 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2536
2537 c = strndup_user(data->client_addr.data, 16);
2538 if (IS_ERR(c))
2539 return PTR_ERR(c);
2540 args->client_address = c;
2541
2542 /*
2543 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2544 * can deal with.
2545 */
2546
2547 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2548 args->rsize = data->rsize;
2549 args->wsize = data->wsize;
2550 args->timeo = data->timeo;
2551 args->retrans = data->retrans;
2552 args->acregmin = data->acregmin;
2553 args->acregmax = data->acregmax;
2554 args->acdirmin = data->acdirmin;
2555 args->acdirmax = data->acdirmax;
2556 args->nfs_server.protocol = data->proto;
2557 nfs_validate_transport_protocol(args);
2558
2559 break;
2560 default:
2561 return NFS_TEXT_DATA;
2562 }
2563
2564 return 0;
2565
2566 out_no_data:
2567 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2568 return -EINVAL;
2569
2570 out_inval_auth:
2571 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2572 data->auth_flavourlen);
2573 return -EINVAL;
2574
2575 out_no_address:
2576 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2577 return -EINVAL;
2578 }
2579
2580 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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