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1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/addr.h>
35#include <linux/sunrpc/stats.h>
36#include <linux/sunrpc/metrics.h>
37#include <linux/sunrpc/xprtsock.h>
38#include <linux/sunrpc/xprtrdma.h>
39#include <linux/nfs_fs.h>
40#include <linux/nfs_mount.h>
41#include <linux/nfs4_mount.h>
42#include <linux/lockd/bind.h>
43#include <linux/seq_file.h>
44#include <linux/mount.h>
45#include <linux/namei.h>
46#include <linux/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 <linux/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 "nfs4session.h"
67#include "pnfs.h"
68#include "nfs.h"
69
70#define NFSDBG_FACILITY NFSDBG_VFS
71#define NFS_TEXT_DATA 1
72
73#if IS_ENABLED(CONFIG_NFS_V3)
74#define NFS_DEFAULT_VERSION 3
75#else
76#define NFS_DEFAULT_VERSION 2
77#endif
78
79enum {
80 /* Mount options that take no arguments */
81 Opt_soft, Opt_hard,
82 Opt_posix, Opt_noposix,
83 Opt_cto, Opt_nocto,
84 Opt_ac, Opt_noac,
85 Opt_lock, Opt_nolock,
86 Opt_udp, Opt_tcp, Opt_rdma,
87 Opt_acl, Opt_noacl,
88 Opt_rdirplus, Opt_nordirplus,
89 Opt_sharecache, Opt_nosharecache,
90 Opt_resvport, Opt_noresvport,
91 Opt_fscache, Opt_nofscache,
92 Opt_migration, Opt_nomigration,
93
94 /* Mount options that take integer arguments */
95 Opt_port,
96 Opt_rsize, Opt_wsize, Opt_bsize,
97 Opt_timeo, Opt_retrans,
98 Opt_acregmin, Opt_acregmax,
99 Opt_acdirmin, Opt_acdirmax,
100 Opt_actimeo,
101 Opt_namelen,
102 Opt_mountport,
103 Opt_mountvers,
104 Opt_minorversion,
105
106 /* Mount options that take string arguments */
107 Opt_nfsvers,
108 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109 Opt_addr, Opt_mountaddr, Opt_clientaddr,
110 Opt_lookupcache,
111 Opt_fscache_uniq,
112 Opt_local_lock,
113
114 /* Special mount options */
115 Opt_userspace, Opt_deprecated, Opt_sloppy,
116
117 Opt_err
118};
119
120static const match_table_t nfs_mount_option_tokens = {
121 { Opt_userspace, "bg" },
122 { Opt_userspace, "fg" },
123 { Opt_userspace, "retry=%s" },
124
125 { Opt_sloppy, "sloppy" },
126
127 { Opt_soft, "soft" },
128 { Opt_hard, "hard" },
129 { Opt_deprecated, "intr" },
130 { Opt_deprecated, "nointr" },
131 { Opt_posix, "posix" },
132 { Opt_noposix, "noposix" },
133 { Opt_cto, "cto" },
134 { Opt_nocto, "nocto" },
135 { Opt_ac, "ac" },
136 { Opt_noac, "noac" },
137 { Opt_lock, "lock" },
138 { Opt_nolock, "nolock" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152 { Opt_migration, "migration" },
153 { Opt_nomigration, "nomigration" },
154
155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
173
174 { Opt_sec, "sec=%s" },
175 { Opt_proto, "proto=%s" },
176 { Opt_mountproto, "mountproto=%s" },
177 { Opt_addr, "addr=%s" },
178 { Opt_clientaddr, "clientaddr=%s" },
179 { Opt_mounthost, "mounthost=%s" },
180 { Opt_mountaddr, "mountaddr=%s" },
181
182 { Opt_lookupcache, "lookupcache=%s" },
183 { Opt_fscache_uniq, "fsc=%s" },
184 { Opt_local_lock, "local_lock=%s" },
185
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers, "v%s" },
188
189 { Opt_err, NULL }
190};
191
192enum {
193 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
194 Opt_xprt_rdma6,
195
196 Opt_xprt_err
197};
198
199static 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 { Opt_xprt_rdma6, "rdma6" },
206
207 { Opt_xprt_err, NULL }
208};
209
210enum {
211 Opt_sec_none, Opt_sec_sys,
212 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
213 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
214 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
215
216 Opt_sec_err
217};
218
219static const match_table_t nfs_secflavor_tokens = {
220 { Opt_sec_none, "none" },
221 { Opt_sec_none, "null" },
222 { Opt_sec_sys, "sys" },
223
224 { Opt_sec_krb5, "krb5" },
225 { Opt_sec_krb5i, "krb5i" },
226 { Opt_sec_krb5p, "krb5p" },
227
228 { Opt_sec_lkey, "lkey" },
229 { Opt_sec_lkeyi, "lkeyi" },
230 { Opt_sec_lkeyp, "lkeyp" },
231
232 { Opt_sec_spkm, "spkm3" },
233 { Opt_sec_spkmi, "spkm3i" },
234 { Opt_sec_spkmp, "spkm3p" },
235
236 { Opt_sec_err, NULL }
237};
238
239enum {
240 Opt_lookupcache_all, Opt_lookupcache_positive,
241 Opt_lookupcache_none,
242
243 Opt_lookupcache_err
244};
245
246static match_table_t nfs_lookupcache_tokens = {
247 { Opt_lookupcache_all, "all" },
248 { Opt_lookupcache_positive, "pos" },
249 { Opt_lookupcache_positive, "positive" },
250 { Opt_lookupcache_none, "none" },
251
252 { Opt_lookupcache_err, NULL }
253};
254
255enum {
256 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
257 Opt_local_lock_none,
258
259 Opt_local_lock_err
260};
261
262static match_table_t nfs_local_lock_tokens = {
263 { Opt_local_lock_all, "all" },
264 { Opt_local_lock_flock, "flock" },
265 { Opt_local_lock_posix, "posix" },
266 { Opt_local_lock_none, "none" },
267
268 { Opt_local_lock_err, NULL }
269};
270
271enum {
272 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
273 Opt_vers_4_1, Opt_vers_4_2,
274
275 Opt_vers_err
276};
277
278static match_table_t nfs_vers_tokens = {
279 { Opt_vers_2, "2" },
280 { Opt_vers_3, "3" },
281 { Opt_vers_4, "4" },
282 { Opt_vers_4_0, "4.0" },
283 { Opt_vers_4_1, "4.1" },
284 { Opt_vers_4_2, "4.2" },
285
286 { Opt_vers_err, NULL }
287};
288
289static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data);
291
292struct file_system_type nfs_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs",
295 .mount = nfs_fs_mount,
296 .kill_sb = nfs_kill_super,
297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
298};
299MODULE_ALIAS_FS("nfs");
300EXPORT_SYMBOL_GPL(nfs_fs_type);
301
302struct file_system_type nfs_xdev_fs_type = {
303 .owner = THIS_MODULE,
304 .name = "nfs",
305 .mount = nfs_xdev_mount,
306 .kill_sb = nfs_kill_super,
307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
308};
309
310const struct super_operations nfs_sops = {
311 .alloc_inode = nfs_alloc_inode,
312 .destroy_inode = nfs_destroy_inode,
313 .write_inode = nfs_write_inode,
314 .drop_inode = nfs_drop_inode,
315 .statfs = nfs_statfs,
316 .evict_inode = nfs_evict_inode,
317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
321 .show_stats = nfs_show_stats,
322 .remount_fs = nfs_remount,
323};
324EXPORT_SYMBOL_GPL(nfs_sops);
325
326#if IS_ENABLED(CONFIG_NFS_V4)
327static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
328static int nfs4_validate_mount_data(void *options,
329 struct nfs_parsed_mount_data *args, const char *dev_name);
330
331struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
337};
338MODULE_ALIAS_FS("nfs4");
339MODULE_ALIAS("nfs4");
340EXPORT_SYMBOL_GPL(nfs4_fs_type);
341
342static int __init register_nfs4_fs(void)
343{
344 return register_filesystem(&nfs4_fs_type);
345}
346
347static void unregister_nfs4_fs(void)
348{
349 unregister_filesystem(&nfs4_fs_type);
350}
351#else
352static int __init register_nfs4_fs(void)
353{
354 return 0;
355}
356
357static void unregister_nfs4_fs(void)
358{
359}
360#endif
361
362static struct shrinker acl_shrinker = {
363 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
365 .seeks = DEFAULT_SEEKS,
366};
367
368/*
369 * Register the NFS filesystems
370 */
371int __init register_nfs_fs(void)
372{
373 int ret;
374
375 ret = register_filesystem(&nfs_fs_type);
376 if (ret < 0)
377 goto error_0;
378
379 ret = register_nfs4_fs();
380 if (ret < 0)
381 goto error_1;
382
383 ret = nfs_register_sysctl();
384 if (ret < 0)
385 goto error_2;
386 ret = register_shrinker(&acl_shrinker);
387 if (ret < 0)
388 goto error_3;
389 return 0;
390error_3:
391 nfs_unregister_sysctl();
392error_2:
393 unregister_nfs4_fs();
394error_1:
395 unregister_filesystem(&nfs_fs_type);
396error_0:
397 return ret;
398}
399
400/*
401 * Unregister the NFS filesystems
402 */
403void __exit unregister_nfs_fs(void)
404{
405 unregister_shrinker(&acl_shrinker);
406 nfs_unregister_sysctl();
407 unregister_nfs4_fs();
408 unregister_filesystem(&nfs_fs_type);
409}
410
411bool nfs_sb_active(struct super_block *sb)
412{
413 struct nfs_server *server = NFS_SB(sb);
414
415 if (!atomic_inc_not_zero(&sb->s_active))
416 return false;
417 if (atomic_inc_return(&server->active) != 1)
418 atomic_dec(&sb->s_active);
419 return true;
420}
421EXPORT_SYMBOL_GPL(nfs_sb_active);
422
423void nfs_sb_deactive(struct super_block *sb)
424{
425 struct nfs_server *server = NFS_SB(sb);
426
427 if (atomic_dec_and_test(&server->active))
428 deactivate_super(sb);
429}
430EXPORT_SYMBOL_GPL(nfs_sb_deactive);
431
432/*
433 * Deliver file system statistics to userspace
434 */
435int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
436{
437 struct nfs_server *server = NFS_SB(dentry->d_sb);
438 unsigned char blockbits;
439 unsigned long blockres;
440 struct nfs_fh *fh = NFS_FH(d_inode(dentry));
441 struct nfs_fsstat res;
442 int error = -ENOMEM;
443
444 res.fattr = nfs_alloc_fattr();
445 if (res.fattr == NULL)
446 goto out_err;
447
448 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
449 if (unlikely(error == -ESTALE)) {
450 struct dentry *pd_dentry;
451
452 pd_dentry = dget_parent(dentry);
453 if (pd_dentry != NULL) {
454 nfs_zap_caches(d_inode(pd_dentry));
455 dput(pd_dentry);
456 }
457 }
458 nfs_free_fattr(res.fattr);
459 if (error < 0)
460 goto out_err;
461
462 buf->f_type = NFS_SUPER_MAGIC;
463
464 /*
465 * Current versions of glibc do not correctly handle the
466 * case where f_frsize != f_bsize. Eventually we want to
467 * report the value of wtmult in this field.
468 */
469 buf->f_frsize = dentry->d_sb->s_blocksize;
470
471 /*
472 * On most *nix systems, f_blocks, f_bfree, and f_bavail
473 * are reported in units of f_frsize. Linux hasn't had
474 * an f_frsize field in its statfs struct until recently,
475 * thus historically Linux's sys_statfs reports these
476 * fields in units of f_bsize.
477 */
478 buf->f_bsize = dentry->d_sb->s_blocksize;
479 blockbits = dentry->d_sb->s_blocksize_bits;
480 blockres = (1 << blockbits) - 1;
481 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
482 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
483 buf->f_bavail = (res.abytes + blockres) >> blockbits;
484
485 buf->f_files = res.tfiles;
486 buf->f_ffree = res.afiles;
487
488 buf->f_namelen = server->namelen;
489
490 return 0;
491
492 out_err:
493 dprintk("%s: statfs error = %d\n", __func__, -error);
494 return error;
495}
496EXPORT_SYMBOL_GPL(nfs_statfs);
497
498/*
499 * Map the security flavour number to a name
500 */
501static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
502{
503 static const struct {
504 rpc_authflavor_t flavour;
505 const char *str;
506 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
507 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
508 { RPC_AUTH_NULL, "null" },
509 { RPC_AUTH_UNIX, "sys" },
510 { RPC_AUTH_GSS_KRB5, "krb5" },
511 { RPC_AUTH_GSS_KRB5I, "krb5i" },
512 { RPC_AUTH_GSS_KRB5P, "krb5p" },
513 { RPC_AUTH_GSS_LKEY, "lkey" },
514 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
515 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
516 { RPC_AUTH_GSS_SPKM, "spkm" },
517 { RPC_AUTH_GSS_SPKMI, "spkmi" },
518 { RPC_AUTH_GSS_SPKMP, "spkmp" },
519 { UINT_MAX, "unknown" }
520 };
521 int i;
522
523 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
524 if (sec_flavours[i].flavour == flavour)
525 break;
526 }
527 return sec_flavours[i].str;
528}
529
530static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
531 int showdefaults)
532{
533 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
534
535 seq_printf(m, ",mountproto=");
536 switch (sap->sa_family) {
537 case AF_INET:
538 switch (nfss->mountd_protocol) {
539 case IPPROTO_UDP:
540 seq_printf(m, RPCBIND_NETID_UDP);
541 break;
542 case IPPROTO_TCP:
543 seq_printf(m, RPCBIND_NETID_TCP);
544 break;
545 default:
546 if (showdefaults)
547 seq_printf(m, "auto");
548 }
549 break;
550 case AF_INET6:
551 switch (nfss->mountd_protocol) {
552 case IPPROTO_UDP:
553 seq_printf(m, RPCBIND_NETID_UDP6);
554 break;
555 case IPPROTO_TCP:
556 seq_printf(m, RPCBIND_NETID_TCP6);
557 break;
558 default:
559 if (showdefaults)
560 seq_printf(m, "auto");
561 }
562 break;
563 default:
564 if (showdefaults)
565 seq_printf(m, "auto");
566 }
567}
568
569static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
570 int showdefaults)
571{
572 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
573
574 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
575 return;
576
577 switch (sap->sa_family) {
578 case AF_INET: {
579 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
580 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
581 break;
582 }
583 case AF_INET6: {
584 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
585 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
586 break;
587 }
588 default:
589 if (showdefaults)
590 seq_printf(m, ",mountaddr=unspecified");
591 }
592
593 if (nfss->mountd_version || showdefaults)
594 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
595 if ((nfss->mountd_port &&
596 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
597 showdefaults)
598 seq_printf(m, ",mountport=%u", nfss->mountd_port);
599
600 nfs_show_mountd_netid(m, nfss, showdefaults);
601}
602
603#if IS_ENABLED(CONFIG_NFS_V4)
604static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
605 int showdefaults)
606{
607 struct nfs_client *clp = nfss->nfs_client;
608
609 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
610}
611#else
612static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
613 int showdefaults)
614{
615}
616#endif
617
618static void nfs_show_nfs_version(struct seq_file *m,
619 unsigned int version,
620 unsigned int minorversion)
621{
622 seq_printf(m, ",vers=%u", version);
623 if (version == 4)
624 seq_printf(m, ".%u", minorversion);
625}
626
627/*
628 * Describe the mount options in force on this server representation
629 */
630static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
631 int showdefaults)
632{
633 static const struct proc_nfs_info {
634 int flag;
635 const char *str;
636 const char *nostr;
637 } nfs_info[] = {
638 { NFS_MOUNT_SOFT, ",soft", ",hard" },
639 { NFS_MOUNT_POSIX, ",posix", "" },
640 { NFS_MOUNT_NOCTO, ",nocto", "" },
641 { NFS_MOUNT_NOAC, ",noac", "" },
642 { NFS_MOUNT_NONLM, ",nolock", "" },
643 { NFS_MOUNT_NOACL, ",noacl", "" },
644 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
645 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
646 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
647 { 0, NULL, NULL }
648 };
649 const struct proc_nfs_info *nfs_infop;
650 struct nfs_client *clp = nfss->nfs_client;
651 u32 version = clp->rpc_ops->version;
652 int local_flock, local_fcntl;
653
654 nfs_show_nfs_version(m, version, clp->cl_minorversion);
655 seq_printf(m, ",rsize=%u", nfss->rsize);
656 seq_printf(m, ",wsize=%u", nfss->wsize);
657 if (nfss->bsize != 0)
658 seq_printf(m, ",bsize=%u", nfss->bsize);
659 seq_printf(m, ",namlen=%u", nfss->namelen);
660 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
661 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
662 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
663 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
664 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
665 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
666 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
667 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
668 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
669 if (nfss->flags & nfs_infop->flag)
670 seq_puts(m, nfs_infop->str);
671 else
672 seq_puts(m, nfs_infop->nostr);
673 }
674 rcu_read_lock();
675 seq_printf(m, ",proto=%s",
676 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
677 rcu_read_unlock();
678 if (version == 4) {
679 if (nfss->port != NFS_PORT)
680 seq_printf(m, ",port=%u", nfss->port);
681 } else
682 if (nfss->port)
683 seq_printf(m, ",port=%u", nfss->port);
684
685 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
686 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
687 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
688
689 if (version != 4)
690 nfs_show_mountd_options(m, nfss, showdefaults);
691 else
692 nfs_show_nfsv4_options(m, nfss, showdefaults);
693
694 if (nfss->options & NFS_OPTION_FSCACHE)
695 seq_printf(m, ",fsc");
696
697 if (nfss->options & NFS_OPTION_MIGRATION)
698 seq_printf(m, ",migration");
699
700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
702 seq_printf(m, ",lookupcache=none");
703 else
704 seq_printf(m, ",lookupcache=pos");
705 }
706
707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
709
710 if (!local_flock && !local_fcntl)
711 seq_printf(m, ",local_lock=none");
712 else if (local_flock && local_fcntl)
713 seq_printf(m, ",local_lock=all");
714 else if (local_flock)
715 seq_printf(m, ",local_lock=flock");
716 else
717 seq_printf(m, ",local_lock=posix");
718}
719
720/*
721 * Describe the mount options on this VFS mountpoint
722 */
723int nfs_show_options(struct seq_file *m, struct dentry *root)
724{
725 struct nfs_server *nfss = NFS_SB(root->d_sb);
726
727 nfs_show_mount_options(m, nfss, 0);
728
729 rcu_read_lock();
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733 rcu_read_unlock();
734
735 return 0;
736}
737EXPORT_SYMBOL_GPL(nfs_show_options);
738
739#if IS_ENABLED(CONFIG_NFS_V4)
740#ifdef CONFIG_NFS_V4_1
741static void show_sessions(struct seq_file *m, struct nfs_server *server)
742{
743 if (nfs4_has_session(server->nfs_client))
744 seq_printf(m, ",sessions");
745}
746#else
747static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
748#endif
749#endif
750
751#ifdef CONFIG_NFS_V4_1
752static void show_pnfs(struct seq_file *m, struct nfs_server *server)
753{
754 seq_printf(m, ",pnfs=");
755 if (server->pnfs_curr_ld)
756 seq_printf(m, "%s", server->pnfs_curr_ld->name);
757 else
758 seq_printf(m, "not configured");
759}
760
761static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
762{
763 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
764 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
765 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
766 "date='%llu,%u'",
767 impl_id->name, impl_id->domain,
768 impl_id->date.seconds, impl_id->date.nseconds);
769 }
770}
771#else
772#if IS_ENABLED(CONFIG_NFS_V4)
773static void show_pnfs(struct seq_file *m, struct nfs_server *server)
774{
775}
776#endif
777static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
778{
779}
780#endif
781
782int nfs_show_devname(struct seq_file *m, struct dentry *root)
783{
784 char *page = (char *) __get_free_page(GFP_KERNEL);
785 char *devname, *dummy;
786 int err = 0;
787 if (!page)
788 return -ENOMEM;
789 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
790 if (IS_ERR(devname))
791 err = PTR_ERR(devname);
792 else
793 seq_escape(m, devname, " \t\n\\");
794 free_page((unsigned long)page);
795 return err;
796}
797EXPORT_SYMBOL_GPL(nfs_show_devname);
798
799int nfs_show_path(struct seq_file *m, struct dentry *dentry)
800{
801 seq_puts(m, "/");
802 return 0;
803}
804EXPORT_SYMBOL_GPL(nfs_show_path);
805
806/*
807 * Present statistical information for this VFS mountpoint
808 */
809int nfs_show_stats(struct seq_file *m, struct dentry *root)
810{
811 int i, cpu;
812 struct nfs_server *nfss = NFS_SB(root->d_sb);
813 struct rpc_auth *auth = nfss->client->cl_auth;
814 struct nfs_iostats totals = { };
815
816 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
817
818 /*
819 * Display all mount option settings
820 */
821 seq_printf(m, "\n\topts:\t");
822 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
823 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
824 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
825 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
826 nfs_show_mount_options(m, nfss, 1);
827
828 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
829
830 show_implementation_id(m, nfss);
831
832 seq_printf(m, "\n\tcaps:\t");
833 seq_printf(m, "caps=0x%x", nfss->caps);
834 seq_printf(m, ",wtmult=%u", nfss->wtmult);
835 seq_printf(m, ",dtsize=%u", nfss->dtsize);
836 seq_printf(m, ",bsize=%u", nfss->bsize);
837 seq_printf(m, ",namlen=%u", nfss->namelen);
838
839#if IS_ENABLED(CONFIG_NFS_V4)
840 if (nfss->nfs_client->rpc_ops->version == 4) {
841 seq_printf(m, "\n\tnfsv4:\t");
842 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
843 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
844 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
845 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
846 show_sessions(m, nfss);
847 show_pnfs(m, nfss);
848 }
849#endif
850
851 /*
852 * Display security flavor in effect for this mount
853 */
854 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
855 if (auth->au_flavor)
856 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
857
858 /*
859 * Display superblock I/O counters
860 */
861 for_each_possible_cpu(cpu) {
862 struct nfs_iostats *stats;
863
864 preempt_disable();
865 stats = per_cpu_ptr(nfss->io_stats, cpu);
866
867 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
868 totals.events[i] += stats->events[i];
869 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
870 totals.bytes[i] += stats->bytes[i];
871#ifdef CONFIG_NFS_FSCACHE
872 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
873 totals.fscache[i] += stats->fscache[i];
874#endif
875
876 preempt_enable();
877 }
878
879 seq_printf(m, "\n\tevents:\t");
880 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
881 seq_printf(m, "%lu ", totals.events[i]);
882 seq_printf(m, "\n\tbytes:\t");
883 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
884 seq_printf(m, "%Lu ", totals.bytes[i]);
885#ifdef CONFIG_NFS_FSCACHE
886 if (nfss->options & NFS_OPTION_FSCACHE) {
887 seq_printf(m, "\n\tfsc:\t");
888 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
889 seq_printf(m, "%Lu ", totals.bytes[i]);
890 }
891#endif
892 seq_printf(m, "\n");
893
894 rpc_print_iostats(m, nfss->client);
895
896 return 0;
897}
898EXPORT_SYMBOL_GPL(nfs_show_stats);
899
900/*
901 * Begin unmount by attempting to remove all automounted mountpoints we added
902 * in response to xdev traversals and referrals
903 */
904void nfs_umount_begin(struct super_block *sb)
905{
906 struct nfs_server *server;
907 struct rpc_clnt *rpc;
908
909 server = NFS_SB(sb);
910 /* -EIO all pending I/O */
911 rpc = server->client_acl;
912 if (!IS_ERR(rpc))
913 rpc_killall_tasks(rpc);
914 rpc = server->client;
915 if (!IS_ERR(rpc))
916 rpc_killall_tasks(rpc);
917}
918EXPORT_SYMBOL_GPL(nfs_umount_begin);
919
920static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
921{
922 struct nfs_parsed_mount_data *data;
923
924 data = kzalloc(sizeof(*data), GFP_KERNEL);
925 if (data) {
926 data->timeo = NFS_UNSPEC_TIMEO;
927 data->retrans = NFS_UNSPEC_RETRANS;
928 data->acregmin = NFS_DEF_ACREGMIN;
929 data->acregmax = NFS_DEF_ACREGMAX;
930 data->acdirmin = NFS_DEF_ACDIRMIN;
931 data->acdirmax = NFS_DEF_ACDIRMAX;
932 data->mount_server.port = NFS_UNSPEC_PORT;
933 data->nfs_server.port = NFS_UNSPEC_PORT;
934 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
935 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
936 data->minorversion = 0;
937 data->need_mount = true;
938 data->net = current->nsproxy->net_ns;
939 security_init_mnt_opts(&data->lsm_opts);
940 }
941 return data;
942}
943
944static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
945{
946 if (data) {
947 kfree(data->client_address);
948 kfree(data->mount_server.hostname);
949 kfree(data->nfs_server.export_path);
950 kfree(data->nfs_server.hostname);
951 kfree(data->fscache_uniq);
952 security_free_mnt_opts(&data->lsm_opts);
953 kfree(data);
954 }
955}
956
957/*
958 * Sanity-check a server address provided by the mount command.
959 *
960 * Address family must be initialized, and address must not be
961 * the ANY address for that family.
962 */
963static int nfs_verify_server_address(struct sockaddr *addr)
964{
965 switch (addr->sa_family) {
966 case AF_INET: {
967 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
968 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
969 }
970 case AF_INET6: {
971 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
972 return !ipv6_addr_any(sa);
973 }
974 }
975
976 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
977 return 0;
978}
979
980/*
981 * Select between a default port value and a user-specified port value.
982 * If a zero value is set, then autobind will be used.
983 */
984static void nfs_set_port(struct sockaddr *sap, int *port,
985 const unsigned short default_port)
986{
987 if (*port == NFS_UNSPEC_PORT)
988 *port = default_port;
989
990 rpc_set_port(sap, *port);
991}
992
993/*
994 * Sanity check the NFS transport protocol.
995 *
996 */
997static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
998{
999 switch (mnt->nfs_server.protocol) {
1000 case XPRT_TRANSPORT_UDP:
1001 case XPRT_TRANSPORT_TCP:
1002 case XPRT_TRANSPORT_RDMA:
1003 break;
1004 default:
1005 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1006 }
1007}
1008
1009/*
1010 * For text based NFSv2/v3 mounts, the mount protocol transport default
1011 * settings should depend upon the specified NFS transport.
1012 */
1013static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1014{
1015 nfs_validate_transport_protocol(mnt);
1016
1017 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1018 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1019 return;
1020 switch (mnt->nfs_server.protocol) {
1021 case XPRT_TRANSPORT_UDP:
1022 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1023 break;
1024 case XPRT_TRANSPORT_TCP:
1025 case XPRT_TRANSPORT_RDMA:
1026 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1027 }
1028}
1029
1030/*
1031 * Add 'flavor' to 'auth_info' if not already present.
1032 * Returns true if 'flavor' ends up in the list, false otherwise
1033 */
1034static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1035 rpc_authflavor_t flavor)
1036{
1037 unsigned int i;
1038 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1039
1040 /* make sure this flavor isn't already in the list */
1041 for (i = 0; i < auth_info->flavor_len; i++) {
1042 if (flavor == auth_info->flavors[i])
1043 return true;
1044 }
1045
1046 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1047 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1048 return false;
1049 }
1050
1051 auth_info->flavors[auth_info->flavor_len++] = flavor;
1052 return true;
1053}
1054
1055/*
1056 * Return true if 'match' is in auth_info or auth_info is empty.
1057 * Return false otherwise.
1058 */
1059bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1060 rpc_authflavor_t match)
1061{
1062 int i;
1063
1064 if (!auth_info->flavor_len)
1065 return true;
1066
1067 for (i = 0; i < auth_info->flavor_len; i++) {
1068 if (auth_info->flavors[i] == match)
1069 return true;
1070 }
1071 return false;
1072}
1073EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1074
1075/*
1076 * Parse the value of the 'sec=' option.
1077 */
1078static int nfs_parse_security_flavors(char *value,
1079 struct nfs_parsed_mount_data *mnt)
1080{
1081 substring_t args[MAX_OPT_ARGS];
1082 rpc_authflavor_t pseudoflavor;
1083 char *p;
1084
1085 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1086
1087 while ((p = strsep(&value, ":")) != NULL) {
1088 switch (match_token(p, nfs_secflavor_tokens, args)) {
1089 case Opt_sec_none:
1090 pseudoflavor = RPC_AUTH_NULL;
1091 break;
1092 case Opt_sec_sys:
1093 pseudoflavor = RPC_AUTH_UNIX;
1094 break;
1095 case Opt_sec_krb5:
1096 pseudoflavor = RPC_AUTH_GSS_KRB5;
1097 break;
1098 case Opt_sec_krb5i:
1099 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1100 break;
1101 case Opt_sec_krb5p:
1102 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1103 break;
1104 case Opt_sec_lkey:
1105 pseudoflavor = RPC_AUTH_GSS_LKEY;
1106 break;
1107 case Opt_sec_lkeyi:
1108 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1109 break;
1110 case Opt_sec_lkeyp:
1111 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1112 break;
1113 case Opt_sec_spkm:
1114 pseudoflavor = RPC_AUTH_GSS_SPKM;
1115 break;
1116 case Opt_sec_spkmi:
1117 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1118 break;
1119 case Opt_sec_spkmp:
1120 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1121 break;
1122 default:
1123 dfprintk(MOUNT,
1124 "NFS: sec= option '%s' not recognized\n", p);
1125 return 0;
1126 }
1127
1128 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1129 return 0;
1130 }
1131
1132 return 1;
1133}
1134
1135static int nfs_parse_version_string(char *string,
1136 struct nfs_parsed_mount_data *mnt,
1137 substring_t *args)
1138{
1139 mnt->flags &= ~NFS_MOUNT_VER3;
1140 switch (match_token(string, nfs_vers_tokens, args)) {
1141 case Opt_vers_2:
1142 mnt->version = 2;
1143 break;
1144 case Opt_vers_3:
1145 mnt->flags |= NFS_MOUNT_VER3;
1146 mnt->version = 3;
1147 break;
1148 case Opt_vers_4:
1149 /* Backward compatibility option. In future,
1150 * the mount program should always supply
1151 * a NFSv4 minor version number.
1152 */
1153 mnt->version = 4;
1154 break;
1155 case Opt_vers_4_0:
1156 mnt->version = 4;
1157 mnt->minorversion = 0;
1158 break;
1159 case Opt_vers_4_1:
1160 mnt->version = 4;
1161 mnt->minorversion = 1;
1162 break;
1163 case Opt_vers_4_2:
1164 mnt->version = 4;
1165 mnt->minorversion = 2;
1166 break;
1167 default:
1168 return 0;
1169 }
1170 return 1;
1171}
1172
1173static int nfs_get_option_str(substring_t args[], char **option)
1174{
1175 kfree(*option);
1176 *option = match_strdup(args);
1177 return !*option;
1178}
1179
1180static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1181{
1182 int rc;
1183 char *string;
1184
1185 string = match_strdup(args);
1186 if (string == NULL)
1187 return -ENOMEM;
1188 rc = kstrtoul(string, 10, option);
1189 kfree(string);
1190
1191 return rc;
1192}
1193
1194static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1195 unsigned long l_bound, unsigned long u_bound)
1196{
1197 int ret;
1198
1199 ret = nfs_get_option_ul(args, option);
1200 if (ret != 0)
1201 return ret;
1202 if (*option < l_bound || *option > u_bound)
1203 return -ERANGE;
1204 return 0;
1205}
1206
1207/*
1208 * Error-check and convert a string of mount options from user space into
1209 * a data structure. The whole mount string is processed; bad options are
1210 * skipped as they are encountered. If there were no errors, return 1;
1211 * otherwise return 0 (zero).
1212 */
1213static int nfs_parse_mount_options(char *raw,
1214 struct nfs_parsed_mount_data *mnt)
1215{
1216 char *p, *string, *secdata;
1217 int rc, sloppy = 0, invalid_option = 0;
1218 unsigned short protofamily = AF_UNSPEC;
1219 unsigned short mountfamily = AF_UNSPEC;
1220
1221 if (!raw) {
1222 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1223 return 1;
1224 }
1225 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1226
1227 secdata = alloc_secdata();
1228 if (!secdata)
1229 goto out_nomem;
1230
1231 rc = security_sb_copy_data(raw, secdata);
1232 if (rc)
1233 goto out_security_failure;
1234
1235 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1236 if (rc)
1237 goto out_security_failure;
1238
1239 free_secdata(secdata);
1240
1241 while ((p = strsep(&raw, ",")) != NULL) {
1242 substring_t args[MAX_OPT_ARGS];
1243 unsigned long option;
1244 int token;
1245
1246 if (!*p)
1247 continue;
1248
1249 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1250
1251 token = match_token(p, nfs_mount_option_tokens, args);
1252 switch (token) {
1253
1254 /*
1255 * boolean options: foo/nofoo
1256 */
1257 case Opt_soft:
1258 mnt->flags |= NFS_MOUNT_SOFT;
1259 break;
1260 case Opt_hard:
1261 mnt->flags &= ~NFS_MOUNT_SOFT;
1262 break;
1263 case Opt_posix:
1264 mnt->flags |= NFS_MOUNT_POSIX;
1265 break;
1266 case Opt_noposix:
1267 mnt->flags &= ~NFS_MOUNT_POSIX;
1268 break;
1269 case Opt_cto:
1270 mnt->flags &= ~NFS_MOUNT_NOCTO;
1271 break;
1272 case Opt_nocto:
1273 mnt->flags |= NFS_MOUNT_NOCTO;
1274 break;
1275 case Opt_ac:
1276 mnt->flags &= ~NFS_MOUNT_NOAC;
1277 break;
1278 case Opt_noac:
1279 mnt->flags |= NFS_MOUNT_NOAC;
1280 break;
1281 case Opt_lock:
1282 mnt->flags &= ~NFS_MOUNT_NONLM;
1283 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1284 NFS_MOUNT_LOCAL_FCNTL);
1285 break;
1286 case Opt_nolock:
1287 mnt->flags |= NFS_MOUNT_NONLM;
1288 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1289 NFS_MOUNT_LOCAL_FCNTL);
1290 break;
1291 case Opt_udp:
1292 mnt->flags &= ~NFS_MOUNT_TCP;
1293 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1294 break;
1295 case Opt_tcp:
1296 mnt->flags |= NFS_MOUNT_TCP;
1297 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1298 break;
1299 case Opt_rdma:
1300 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1301 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1302 xprt_load_transport(p);
1303 break;
1304 case Opt_acl:
1305 mnt->flags &= ~NFS_MOUNT_NOACL;
1306 break;
1307 case Opt_noacl:
1308 mnt->flags |= NFS_MOUNT_NOACL;
1309 break;
1310 case Opt_rdirplus:
1311 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1312 break;
1313 case Opt_nordirplus:
1314 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1315 break;
1316 case Opt_sharecache:
1317 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1318 break;
1319 case Opt_nosharecache:
1320 mnt->flags |= NFS_MOUNT_UNSHARED;
1321 break;
1322 case Opt_resvport:
1323 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1324 break;
1325 case Opt_noresvport:
1326 mnt->flags |= NFS_MOUNT_NORESVPORT;
1327 break;
1328 case Opt_fscache:
1329 mnt->options |= NFS_OPTION_FSCACHE;
1330 kfree(mnt->fscache_uniq);
1331 mnt->fscache_uniq = NULL;
1332 break;
1333 case Opt_nofscache:
1334 mnt->options &= ~NFS_OPTION_FSCACHE;
1335 kfree(mnt->fscache_uniq);
1336 mnt->fscache_uniq = NULL;
1337 break;
1338 case Opt_migration:
1339 mnt->options |= NFS_OPTION_MIGRATION;
1340 break;
1341 case Opt_nomigration:
1342 mnt->options &= NFS_OPTION_MIGRATION;
1343 break;
1344
1345 /*
1346 * options that take numeric values
1347 */
1348 case Opt_port:
1349 if (nfs_get_option_ul(args, &option) ||
1350 option > USHRT_MAX)
1351 goto out_invalid_value;
1352 mnt->nfs_server.port = option;
1353 break;
1354 case Opt_rsize:
1355 if (nfs_get_option_ul(args, &option))
1356 goto out_invalid_value;
1357 mnt->rsize = option;
1358 break;
1359 case Opt_wsize:
1360 if (nfs_get_option_ul(args, &option))
1361 goto out_invalid_value;
1362 mnt->wsize = option;
1363 break;
1364 case Opt_bsize:
1365 if (nfs_get_option_ul(args, &option))
1366 goto out_invalid_value;
1367 mnt->bsize = option;
1368 break;
1369 case Opt_timeo:
1370 if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1371 goto out_invalid_value;
1372 mnt->timeo = option;
1373 break;
1374 case Opt_retrans:
1375 if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1376 goto out_invalid_value;
1377 mnt->retrans = option;
1378 break;
1379 case Opt_acregmin:
1380 if (nfs_get_option_ul(args, &option))
1381 goto out_invalid_value;
1382 mnt->acregmin = option;
1383 break;
1384 case Opt_acregmax:
1385 if (nfs_get_option_ul(args, &option))
1386 goto out_invalid_value;
1387 mnt->acregmax = option;
1388 break;
1389 case Opt_acdirmin:
1390 if (nfs_get_option_ul(args, &option))
1391 goto out_invalid_value;
1392 mnt->acdirmin = option;
1393 break;
1394 case Opt_acdirmax:
1395 if (nfs_get_option_ul(args, &option))
1396 goto out_invalid_value;
1397 mnt->acdirmax = option;
1398 break;
1399 case Opt_actimeo:
1400 if (nfs_get_option_ul(args, &option))
1401 goto out_invalid_value;
1402 mnt->acregmin = mnt->acregmax =
1403 mnt->acdirmin = mnt->acdirmax = option;
1404 break;
1405 case Opt_namelen:
1406 if (nfs_get_option_ul(args, &option))
1407 goto out_invalid_value;
1408 mnt->namlen = option;
1409 break;
1410 case Opt_mountport:
1411 if (nfs_get_option_ul(args, &option) ||
1412 option > USHRT_MAX)
1413 goto out_invalid_value;
1414 mnt->mount_server.port = option;
1415 break;
1416 case Opt_mountvers:
1417 if (nfs_get_option_ul(args, &option) ||
1418 option < NFS_MNT_VERSION ||
1419 option > NFS_MNT3_VERSION)
1420 goto out_invalid_value;
1421 mnt->mount_server.version = option;
1422 break;
1423 case Opt_minorversion:
1424 if (nfs_get_option_ul(args, &option))
1425 goto out_invalid_value;
1426 if (option > NFS4_MAX_MINOR_VERSION)
1427 goto out_invalid_value;
1428 mnt->minorversion = option;
1429 break;
1430
1431 /*
1432 * options that take text values
1433 */
1434 case Opt_nfsvers:
1435 string = match_strdup(args);
1436 if (string == NULL)
1437 goto out_nomem;
1438 rc = nfs_parse_version_string(string, mnt, args);
1439 kfree(string);
1440 if (!rc)
1441 goto out_invalid_value;
1442 break;
1443 case Opt_sec:
1444 string = match_strdup(args);
1445 if (string == NULL)
1446 goto out_nomem;
1447 rc = nfs_parse_security_flavors(string, mnt);
1448 kfree(string);
1449 if (!rc) {
1450 dfprintk(MOUNT, "NFS: unrecognized "
1451 "security flavor\n");
1452 return 0;
1453 }
1454 break;
1455 case Opt_proto:
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
1462 protofamily = AF_INET;
1463 switch (token) {
1464 case Opt_xprt_udp6:
1465 protofamily = AF_INET6;
1466 case Opt_xprt_udp:
1467 mnt->flags &= ~NFS_MOUNT_TCP;
1468 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1469 break;
1470 case Opt_xprt_tcp6:
1471 protofamily = AF_INET6;
1472 case Opt_xprt_tcp:
1473 mnt->flags |= NFS_MOUNT_TCP;
1474 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1475 break;
1476 case Opt_xprt_rdma6:
1477 protofamily = AF_INET6;
1478 case Opt_xprt_rdma:
1479 /* vector side protocols to TCP */
1480 mnt->flags |= NFS_MOUNT_TCP;
1481 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1482 xprt_load_transport(string);
1483 break;
1484 default:
1485 dfprintk(MOUNT, "NFS: unrecognized "
1486 "transport protocol\n");
1487 kfree(string);
1488 return 0;
1489 }
1490 kfree(string);
1491 break;
1492 case Opt_mountproto:
1493 string = match_strdup(args);
1494 if (string == NULL)
1495 goto out_nomem;
1496 token = match_token(string,
1497 nfs_xprt_protocol_tokens, args);
1498 kfree(string);
1499
1500 mountfamily = AF_INET;
1501 switch (token) {
1502 case Opt_xprt_udp6:
1503 mountfamily = AF_INET6;
1504 case Opt_xprt_udp:
1505 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1506 break;
1507 case Opt_xprt_tcp6:
1508 mountfamily = AF_INET6;
1509 case Opt_xprt_tcp:
1510 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1511 break;
1512 case Opt_xprt_rdma: /* not used for side protocols */
1513 default:
1514 dfprintk(MOUNT, "NFS: unrecognized "
1515 "transport protocol\n");
1516 return 0;
1517 }
1518 break;
1519 case Opt_addr:
1520 string = match_strdup(args);
1521 if (string == NULL)
1522 goto out_nomem;
1523 mnt->nfs_server.addrlen =
1524 rpc_pton(mnt->net, string, strlen(string),
1525 (struct sockaddr *)
1526 &mnt->nfs_server.address,
1527 sizeof(mnt->nfs_server.address));
1528 kfree(string);
1529 if (mnt->nfs_server.addrlen == 0)
1530 goto out_invalid_address;
1531 break;
1532 case Opt_clientaddr:
1533 if (nfs_get_option_str(args, &mnt->client_address))
1534 goto out_nomem;
1535 break;
1536 case Opt_mounthost:
1537 if (nfs_get_option_str(args,
1538 &mnt->mount_server.hostname))
1539 goto out_nomem;
1540 break;
1541 case Opt_mountaddr:
1542 string = match_strdup(args);
1543 if (string == NULL)
1544 goto out_nomem;
1545 mnt->mount_server.addrlen =
1546 rpc_pton(mnt->net, string, strlen(string),
1547 (struct sockaddr *)
1548 &mnt->mount_server.address,
1549 sizeof(mnt->mount_server.address));
1550 kfree(string);
1551 if (mnt->mount_server.addrlen == 0)
1552 goto out_invalid_address;
1553 break;
1554 case Opt_lookupcache:
1555 string = match_strdup(args);
1556 if (string == NULL)
1557 goto out_nomem;
1558 token = match_token(string,
1559 nfs_lookupcache_tokens, args);
1560 kfree(string);
1561 switch (token) {
1562 case Opt_lookupcache_all:
1563 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1564 break;
1565 case Opt_lookupcache_positive:
1566 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1567 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1568 break;
1569 case Opt_lookupcache_none:
1570 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1571 break;
1572 default:
1573 dfprintk(MOUNT, "NFS: invalid "
1574 "lookupcache argument\n");
1575 return 0;
1576 };
1577 break;
1578 case Opt_fscache_uniq:
1579 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1580 goto out_nomem;
1581 mnt->options |= NFS_OPTION_FSCACHE;
1582 break;
1583 case Opt_local_lock:
1584 string = match_strdup(args);
1585 if (string == NULL)
1586 goto out_nomem;
1587 token = match_token(string, nfs_local_lock_tokens,
1588 args);
1589 kfree(string);
1590 switch (token) {
1591 case Opt_local_lock_all:
1592 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1593 NFS_MOUNT_LOCAL_FCNTL);
1594 break;
1595 case Opt_local_lock_flock:
1596 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1597 break;
1598 case Opt_local_lock_posix:
1599 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1600 break;
1601 case Opt_local_lock_none:
1602 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1603 NFS_MOUNT_LOCAL_FCNTL);
1604 break;
1605 default:
1606 dfprintk(MOUNT, "NFS: invalid "
1607 "local_lock argument\n");
1608 return 0;
1609 };
1610 break;
1611
1612 /*
1613 * Special options
1614 */
1615 case Opt_sloppy:
1616 sloppy = 1;
1617 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1618 break;
1619 case Opt_userspace:
1620 case Opt_deprecated:
1621 dfprintk(MOUNT, "NFS: ignoring mount option "
1622 "'%s'\n", p);
1623 break;
1624
1625 default:
1626 invalid_option = 1;
1627 dfprintk(MOUNT, "NFS: unrecognized mount option "
1628 "'%s'\n", p);
1629 }
1630 }
1631
1632 if (!sloppy && invalid_option)
1633 return 0;
1634
1635 if (mnt->minorversion && mnt->version != 4)
1636 goto out_minorversion_mismatch;
1637
1638 if (mnt->options & NFS_OPTION_MIGRATION &&
1639 (mnt->version != 4 || mnt->minorversion != 0))
1640 goto out_migration_misuse;
1641
1642 /*
1643 * verify that any proto=/mountproto= options match the address
1644 * families in the addr=/mountaddr= options.
1645 */
1646 if (protofamily != AF_UNSPEC &&
1647 protofamily != mnt->nfs_server.address.ss_family)
1648 goto out_proto_mismatch;
1649
1650 if (mountfamily != AF_UNSPEC) {
1651 if (mnt->mount_server.addrlen) {
1652 if (mountfamily != mnt->mount_server.address.ss_family)
1653 goto out_mountproto_mismatch;
1654 } else {
1655 if (mountfamily != mnt->nfs_server.address.ss_family)
1656 goto out_mountproto_mismatch;
1657 }
1658 }
1659
1660 return 1;
1661
1662out_mountproto_mismatch:
1663 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1664 "option\n");
1665 return 0;
1666out_proto_mismatch:
1667 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1668 return 0;
1669out_invalid_address:
1670 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1671 return 0;
1672out_invalid_value:
1673 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1674 return 0;
1675out_minorversion_mismatch:
1676 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1677 "minorversion=%u\n", mnt->version, mnt->minorversion);
1678 return 0;
1679out_migration_misuse:
1680 printk(KERN_INFO
1681 "NFS: 'migration' not supported for this NFS version\n");
1682 return 0;
1683out_nomem:
1684 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1685 return 0;
1686out_security_failure:
1687 free_secdata(secdata);
1688 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1689 return 0;
1690}
1691
1692/*
1693 * Ensure that a specified authtype in args->auth_info is supported by
1694 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1695 * -EACCES if not.
1696 */
1697static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1698 rpc_authflavor_t *server_authlist, unsigned int count)
1699{
1700 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1701 unsigned int i;
1702 int use_auth_null = false;
1703
1704 /*
1705 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1706 * must be in the list returned by the server.
1707 *
1708 * AUTH_NULL has a special meaning when it's in the server list - it
1709 * means that the server will ignore the rpc creds, so any flavor
1710 * can be used but still use the sec= that was specified.
1711 */
1712 for (i = 0; i < count; i++) {
1713 flavor = server_authlist[i];
1714
1715 if (nfs_auth_info_match(&args->auth_info, flavor))
1716 goto out;
1717
1718 if (flavor == RPC_AUTH_NULL)
1719 use_auth_null = true;
1720 }
1721
1722 if (use_auth_null) {
1723 flavor = RPC_AUTH_NULL;
1724 goto out;
1725 }
1726
1727 dfprintk(MOUNT,
1728 "NFS: specified auth flavors not supported by server\n");
1729 return -EACCES;
1730
1731out:
1732 args->selected_flavor = flavor;
1733 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1734 return 0;
1735}
1736
1737/*
1738 * Use the remote server's MOUNT service to request the NFS file handle
1739 * corresponding to the provided path.
1740 */
1741static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1742 struct nfs_fh *root_fh,
1743 rpc_authflavor_t *server_authlist,
1744 unsigned int *server_authlist_len)
1745{
1746 struct nfs_mount_request request = {
1747 .sap = (struct sockaddr *)
1748 &args->mount_server.address,
1749 .dirpath = args->nfs_server.export_path,
1750 .protocol = args->mount_server.protocol,
1751 .fh = root_fh,
1752 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1753 .auth_flav_len = server_authlist_len,
1754 .auth_flavs = server_authlist,
1755 .net = args->net,
1756 };
1757 int status;
1758
1759 if (args->mount_server.version == 0) {
1760 switch (args->version) {
1761 default:
1762 args->mount_server.version = NFS_MNT3_VERSION;
1763 break;
1764 case 2:
1765 args->mount_server.version = NFS_MNT_VERSION;
1766 }
1767 }
1768 request.version = args->mount_server.version;
1769
1770 if (args->mount_server.hostname)
1771 request.hostname = args->mount_server.hostname;
1772 else
1773 request.hostname = args->nfs_server.hostname;
1774
1775 /*
1776 * Construct the mount server's address.
1777 */
1778 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1779 memcpy(request.sap, &args->nfs_server.address,
1780 args->nfs_server.addrlen);
1781 args->mount_server.addrlen = args->nfs_server.addrlen;
1782 }
1783 request.salen = args->mount_server.addrlen;
1784 nfs_set_port(request.sap, &args->mount_server.port, 0);
1785
1786 /*
1787 * Now ask the mount server to map our export path
1788 * to a file handle.
1789 */
1790 status = nfs_mount(&request);
1791 if (status != 0) {
1792 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1793 request.hostname, status);
1794 return status;
1795 }
1796
1797 return 0;
1798}
1799
1800static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1801 struct nfs_subversion *nfs_mod)
1802{
1803 int status;
1804 unsigned int i;
1805 bool tried_auth_unix = false;
1806 bool auth_null_in_list = false;
1807 struct nfs_server *server = ERR_PTR(-EACCES);
1808 struct nfs_parsed_mount_data *args = mount_info->parsed;
1809 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1810 unsigned int authlist_len = ARRAY_SIZE(authlist);
1811
1812 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1813 &authlist_len);
1814 if (status)
1815 return ERR_PTR(status);
1816
1817 /*
1818 * Was a sec= authflavor specified in the options? First, verify
1819 * whether the server supports it, and then just try to use it if so.
1820 */
1821 if (args->auth_info.flavor_len > 0) {
1822 status = nfs_verify_authflavors(args, authlist, authlist_len);
1823 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1824 args->selected_flavor);
1825 if (status)
1826 return ERR_PTR(status);
1827 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1828 }
1829
1830 /*
1831 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1832 * SHOULD prefer the flavor listed first. However, some servers list
1833 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1834 */
1835 for (i = 0; i < authlist_len; ++i) {
1836 rpc_authflavor_t flavor;
1837 struct rpcsec_gss_info info;
1838
1839 flavor = authlist[i];
1840 switch (flavor) {
1841 case RPC_AUTH_UNIX:
1842 tried_auth_unix = true;
1843 break;
1844 case RPC_AUTH_NULL:
1845 auth_null_in_list = true;
1846 continue;
1847 default:
1848 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1849 continue;
1850 /* Fallthrough */
1851 }
1852 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1853 args->selected_flavor = flavor;
1854 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1855 if (!IS_ERR(server))
1856 return server;
1857 }
1858
1859 /*
1860 * Nothing we tried so far worked. At this point, give up if we've
1861 * already tried AUTH_UNIX or if the server's list doesn't contain
1862 * AUTH_NULL
1863 */
1864 if (tried_auth_unix || !auth_null_in_list)
1865 return server;
1866
1867 /* Last chance! Try AUTH_UNIX */
1868 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1869 args->selected_flavor = RPC_AUTH_UNIX;
1870 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1871}
1872
1873struct dentry *nfs_try_mount(int flags, const char *dev_name,
1874 struct nfs_mount_info *mount_info,
1875 struct nfs_subversion *nfs_mod)
1876{
1877 struct nfs_server *server;
1878
1879 if (mount_info->parsed->need_mount)
1880 server = nfs_try_mount_request(mount_info, nfs_mod);
1881 else
1882 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1883
1884 if (IS_ERR(server))
1885 return ERR_CAST(server);
1886
1887 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1888}
1889EXPORT_SYMBOL_GPL(nfs_try_mount);
1890
1891/*
1892 * Split "dev_name" into "hostname:export_path".
1893 *
1894 * The leftmost colon demarks the split between the server's hostname
1895 * and the export path. If the hostname starts with a left square
1896 * bracket, then it may contain colons.
1897 *
1898 * Note: caller frees hostname and export path, even on error.
1899 */
1900static int nfs_parse_devname(const char *dev_name,
1901 char **hostname, size_t maxnamlen,
1902 char **export_path, size_t maxpathlen)
1903{
1904 size_t len;
1905 char *end;
1906
1907 /* Is the host name protected with square brakcets? */
1908 if (*dev_name == '[') {
1909 end = strchr(++dev_name, ']');
1910 if (end == NULL || end[1] != ':')
1911 goto out_bad_devname;
1912
1913 len = end - dev_name;
1914 end++;
1915 } else {
1916 char *comma;
1917
1918 end = strchr(dev_name, ':');
1919 if (end == NULL)
1920 goto out_bad_devname;
1921 len = end - dev_name;
1922
1923 /* kill possible hostname list: not supported */
1924 comma = strchr(dev_name, ',');
1925 if (comma != NULL && comma < end)
1926 *comma = 0;
1927 }
1928
1929 if (len > maxnamlen)
1930 goto out_hostname;
1931
1932 /* N.B. caller will free nfs_server.hostname in all cases */
1933 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1934 if (*hostname == NULL)
1935 goto out_nomem;
1936 len = strlen(++end);
1937 if (len > maxpathlen)
1938 goto out_path;
1939 *export_path = kstrndup(end, len, GFP_KERNEL);
1940 if (!*export_path)
1941 goto out_nomem;
1942
1943 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1944 return 0;
1945
1946out_bad_devname:
1947 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1948 return -EINVAL;
1949
1950out_nomem:
1951 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1952 return -ENOMEM;
1953
1954out_hostname:
1955 dfprintk(MOUNT, "NFS: server hostname too long\n");
1956 return -ENAMETOOLONG;
1957
1958out_path:
1959 dfprintk(MOUNT, "NFS: export pathname too long\n");
1960 return -ENAMETOOLONG;
1961}
1962
1963/*
1964 * Validate the NFS2/NFS3 mount data
1965 * - fills in the mount root filehandle
1966 *
1967 * For option strings, user space handles the following behaviors:
1968 *
1969 * + DNS: mapping server host name to IP address ("addr=" option)
1970 *
1971 * + failure mode: how to behave if a mount request can't be handled
1972 * immediately ("fg/bg" option)
1973 *
1974 * + retry: how often to retry a mount request ("retry=" option)
1975 *
1976 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1977 * mountproto=tcp after mountproto=udp, and so on
1978 */
1979static int nfs23_validate_mount_data(void *options,
1980 struct nfs_parsed_mount_data *args,
1981 struct nfs_fh *mntfh,
1982 const char *dev_name)
1983{
1984 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1985 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1986 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1987
1988 if (data == NULL)
1989 goto out_no_data;
1990
1991 args->version = NFS_DEFAULT_VERSION;
1992 switch (data->version) {
1993 case 1:
1994 data->namlen = 0;
1995 case 2:
1996 data->bsize = 0;
1997 case 3:
1998 if (data->flags & NFS_MOUNT_VER3)
1999 goto out_no_v3;
2000 data->root.size = NFS2_FHSIZE;
2001 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2002 /* Turn off security negotiation */
2003 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2004 case 4:
2005 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2006 goto out_no_sec;
2007 case 5:
2008 memset(data->context, 0, sizeof(data->context));
2009 case 6:
2010 if (data->flags & NFS_MOUNT_VER3) {
2011 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2012 goto out_invalid_fh;
2013 mntfh->size = data->root.size;
2014 args->version = 3;
2015 } else {
2016 mntfh->size = NFS2_FHSIZE;
2017 args->version = 2;
2018 }
2019
2020
2021 memcpy(mntfh->data, data->root.data, mntfh->size);
2022 if (mntfh->size < sizeof(mntfh->data))
2023 memset(mntfh->data + mntfh->size, 0,
2024 sizeof(mntfh->data) - mntfh->size);
2025
2026 /*
2027 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2028 * can deal with.
2029 */
2030 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
2031 args->flags |= extra_flags;
2032 args->rsize = data->rsize;
2033 args->wsize = data->wsize;
2034 args->timeo = data->timeo;
2035 args->retrans = data->retrans;
2036 args->acregmin = data->acregmin;
2037 args->acregmax = data->acregmax;
2038 args->acdirmin = data->acdirmin;
2039 args->acdirmax = data->acdirmax;
2040 args->need_mount = false;
2041
2042 memcpy(sap, &data->addr, sizeof(data->addr));
2043 args->nfs_server.addrlen = sizeof(data->addr);
2044 args->nfs_server.port = ntohs(data->addr.sin_port);
2045 if (!nfs_verify_server_address(sap))
2046 goto out_no_address;
2047
2048 if (!(data->flags & NFS_MOUNT_TCP))
2049 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2050 /* N.B. caller will free nfs_server.hostname in all cases */
2051 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2052 args->namlen = data->namlen;
2053 args->bsize = data->bsize;
2054
2055 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2056 args->selected_flavor = data->pseudoflavor;
2057 else
2058 args->selected_flavor = RPC_AUTH_UNIX;
2059 if (!args->nfs_server.hostname)
2060 goto out_nomem;
2061
2062 if (!(data->flags & NFS_MOUNT_NONLM))
2063 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2064 NFS_MOUNT_LOCAL_FCNTL);
2065 else
2066 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2067 NFS_MOUNT_LOCAL_FCNTL);
2068 /*
2069 * The legacy version 6 binary mount data from userspace has a
2070 * field used only to transport selinux information into the
2071 * the kernel. To continue to support that functionality we
2072 * have a touch of selinux knowledge here in the NFS code. The
2073 * userspace code converted context=blah to just blah so we are
2074 * converting back to the full string selinux understands.
2075 */
2076 if (data->context[0]){
2077#ifdef CONFIG_SECURITY_SELINUX
2078 int rc;
2079 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2080 if (!opts_str)
2081 return -ENOMEM;
2082 strcpy(opts_str, "context=");
2083 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2084 strcat(opts_str, &data->context[0]);
2085 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2086 kfree(opts_str);
2087 if (rc)
2088 return rc;
2089#else
2090 return -EINVAL;
2091#endif
2092 }
2093
2094 break;
2095 default:
2096 return NFS_TEXT_DATA;
2097 }
2098
2099 return 0;
2100
2101out_no_data:
2102 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2103 return -EINVAL;
2104
2105out_no_v3:
2106 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2107 data->version);
2108 return -EINVAL;
2109
2110out_no_sec:
2111 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2112 return -EINVAL;
2113
2114out_nomem:
2115 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2116 return -ENOMEM;
2117
2118out_no_address:
2119 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2120 return -EINVAL;
2121
2122out_invalid_fh:
2123 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2124 return -EINVAL;
2125}
2126
2127#if IS_ENABLED(CONFIG_NFS_V4)
2128static int nfs_validate_mount_data(struct file_system_type *fs_type,
2129 void *options,
2130 struct nfs_parsed_mount_data *args,
2131 struct nfs_fh *mntfh,
2132 const char *dev_name)
2133{
2134 if (fs_type == &nfs_fs_type)
2135 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2136 return nfs4_validate_mount_data(options, args, dev_name);
2137}
2138#else
2139static int nfs_validate_mount_data(struct file_system_type *fs_type,
2140 void *options,
2141 struct nfs_parsed_mount_data *args,
2142 struct nfs_fh *mntfh,
2143 const char *dev_name)
2144{
2145 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2146}
2147#endif
2148
2149static int nfs_validate_text_mount_data(void *options,
2150 struct nfs_parsed_mount_data *args,
2151 const char *dev_name)
2152{
2153 int port = 0;
2154 int max_namelen = PAGE_SIZE;
2155 int max_pathlen = NFS_MAXPATHLEN;
2156 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2157
2158 if (nfs_parse_mount_options((char *)options, args) == 0)
2159 return -EINVAL;
2160
2161 if (!nfs_verify_server_address(sap))
2162 goto out_no_address;
2163
2164 if (args->version == 4) {
2165#if IS_ENABLED(CONFIG_NFS_V4)
2166 port = NFS_PORT;
2167 max_namelen = NFS4_MAXNAMLEN;
2168 max_pathlen = NFS4_MAXPATHLEN;
2169 nfs_validate_transport_protocol(args);
2170 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2171 goto out_invalid_transport_udp;
2172 nfs4_validate_mount_flags(args);
2173#else
2174 goto out_v4_not_compiled;
2175#endif /* CONFIG_NFS_V4 */
2176 } else
2177 nfs_set_mount_transport_protocol(args);
2178
2179 nfs_set_port(sap, &args->nfs_server.port, port);
2180
2181 return nfs_parse_devname(dev_name,
2182 &args->nfs_server.hostname,
2183 max_namelen,
2184 &args->nfs_server.export_path,
2185 max_pathlen);
2186
2187#if !IS_ENABLED(CONFIG_NFS_V4)
2188out_v4_not_compiled:
2189 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2190 return -EPROTONOSUPPORT;
2191#else
2192out_invalid_transport_udp:
2193 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2194 return -EINVAL;
2195#endif /* !CONFIG_NFS_V4 */
2196
2197out_no_address:
2198 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2199 return -EINVAL;
2200}
2201
2202#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2203 | NFS_MOUNT_SECURE \
2204 | NFS_MOUNT_TCP \
2205 | NFS_MOUNT_VER3 \
2206 | NFS_MOUNT_KERBEROS \
2207 | NFS_MOUNT_NONLM \
2208 | NFS_MOUNT_BROKEN_SUID \
2209 | NFS_MOUNT_STRICTLOCK \
2210 | NFS_MOUNT_LEGACY_INTERFACE)
2211
2212#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2213 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2214
2215static int
2216nfs_compare_remount_data(struct nfs_server *nfss,
2217 struct nfs_parsed_mount_data *data)
2218{
2219 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2220 data->rsize != nfss->rsize ||
2221 data->wsize != nfss->wsize ||
2222 data->version != nfss->nfs_client->rpc_ops->version ||
2223 data->minorversion != nfss->nfs_client->cl_minorversion ||
2224 data->retrans != nfss->client->cl_timeout->to_retries ||
2225 !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2226 data->acregmin != nfss->acregmin / HZ ||
2227 data->acregmax != nfss->acregmax / HZ ||
2228 data->acdirmin != nfss->acdirmin / HZ ||
2229 data->acdirmax != nfss->acdirmax / HZ ||
2230 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2231 data->nfs_server.port != nfss->port ||
2232 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2233 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2234 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2235 return -EINVAL;
2236
2237 return 0;
2238}
2239
2240int
2241nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2242{
2243 int error;
2244 struct nfs_server *nfss = sb->s_fs_info;
2245 struct nfs_parsed_mount_data *data;
2246 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2247 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2248 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2249
2250 sync_filesystem(sb);
2251
2252 /*
2253 * Userspace mount programs that send binary options generally send
2254 * them populated with default values. We have no way to know which
2255 * ones were explicitly specified. Fall back to legacy behavior and
2256 * just return success.
2257 */
2258 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2259 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2260 options->version <= 6))))
2261 return 0;
2262
2263 data = kzalloc(sizeof(*data), GFP_KERNEL);
2264 if (data == NULL)
2265 return -ENOMEM;
2266
2267 /* fill out struct with values from existing mount */
2268 data->flags = nfss->flags;
2269 data->rsize = nfss->rsize;
2270 data->wsize = nfss->wsize;
2271 data->retrans = nfss->client->cl_timeout->to_retries;
2272 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2273 data->acregmin = nfss->acregmin / HZ;
2274 data->acregmax = nfss->acregmax / HZ;
2275 data->acdirmin = nfss->acdirmin / HZ;
2276 data->acdirmax = nfss->acdirmax / HZ;
2277 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2278 data->nfs_server.port = nfss->port;
2279 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2280 data->version = nfsvers;
2281 data->minorversion = nfss->nfs_client->cl_minorversion;
2282 data->net = current->nsproxy->net_ns;
2283 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2284 data->nfs_server.addrlen);
2285
2286 /* overwrite those values with any that were specified */
2287 error = -EINVAL;
2288 if (!nfs_parse_mount_options((char *)options, data))
2289 goto out;
2290
2291 /*
2292 * noac is a special case. It implies -o sync, but that's not
2293 * necessarily reflected in the mtab options. do_remount_sb
2294 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2295 * remount options, so we have to explicitly reset it.
2296 */
2297 if (data->flags & NFS_MOUNT_NOAC)
2298 *flags |= MS_SYNCHRONOUS;
2299
2300 /* compare new mount options with old ones */
2301 error = nfs_compare_remount_data(nfss, data);
2302out:
2303 kfree(data);
2304 return error;
2305}
2306EXPORT_SYMBOL_GPL(nfs_remount);
2307
2308/*
2309 * Initialise the common bits of the superblock
2310 */
2311inline void nfs_initialise_sb(struct super_block *sb)
2312{
2313 struct nfs_server *server = NFS_SB(sb);
2314
2315 sb->s_magic = NFS_SUPER_MAGIC;
2316
2317 /* We probably want something more informative here */
2318 snprintf(sb->s_id, sizeof(sb->s_id),
2319 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2320
2321 if (sb->s_blocksize == 0)
2322 sb->s_blocksize = nfs_block_bits(server->wsize,
2323 &sb->s_blocksize_bits);
2324
2325 sb->s_bdi = &server->backing_dev_info;
2326
2327 nfs_super_set_maxbytes(sb, server->maxfilesize);
2328}
2329
2330/*
2331 * Finish setting up an NFS2/3 superblock
2332 */
2333void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2334{
2335 struct nfs_parsed_mount_data *data = mount_info->parsed;
2336 struct nfs_server *server = NFS_SB(sb);
2337
2338 sb->s_blocksize_bits = 0;
2339 sb->s_blocksize = 0;
2340 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2341 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2342 if (data && data->bsize)
2343 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2344
2345 if (server->nfs_client->rpc_ops->version != 2) {
2346 /* The VFS shouldn't apply the umask to mode bits. We will do
2347 * so ourselves when necessary.
2348 */
2349 sb->s_flags |= MS_POSIXACL;
2350 sb->s_time_gran = 1;
2351 }
2352
2353 nfs_initialise_sb(sb);
2354}
2355EXPORT_SYMBOL_GPL(nfs_fill_super);
2356
2357/*
2358 * Finish setting up a cloned NFS2/3/4 superblock
2359 */
2360void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2361{
2362 const struct super_block *old_sb = mount_info->cloned->sb;
2363 struct nfs_server *server = NFS_SB(sb);
2364
2365 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2366 sb->s_blocksize = old_sb->s_blocksize;
2367 sb->s_maxbytes = old_sb->s_maxbytes;
2368 sb->s_xattr = old_sb->s_xattr;
2369 sb->s_op = old_sb->s_op;
2370 sb->s_time_gran = 1;
2371
2372 if (server->nfs_client->rpc_ops->version != 2) {
2373 /* The VFS shouldn't apply the umask to mode bits. We will do
2374 * so ourselves when necessary.
2375 */
2376 sb->s_flags |= MS_POSIXACL;
2377 }
2378
2379 nfs_initialise_sb(sb);
2380}
2381
2382static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2383{
2384 const struct nfs_server *a = s->s_fs_info;
2385 const struct rpc_clnt *clnt_a = a->client;
2386 const struct rpc_clnt *clnt_b = b->client;
2387
2388 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2389 goto Ebusy;
2390 if (a->nfs_client != b->nfs_client)
2391 goto Ebusy;
2392 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2393 goto Ebusy;
2394 if (a->wsize != b->wsize)
2395 goto Ebusy;
2396 if (a->rsize != b->rsize)
2397 goto Ebusy;
2398 if (a->acregmin != b->acregmin)
2399 goto Ebusy;
2400 if (a->acregmax != b->acregmax)
2401 goto Ebusy;
2402 if (a->acdirmin != b->acdirmin)
2403 goto Ebusy;
2404 if (a->acdirmax != b->acdirmax)
2405 goto Ebusy;
2406 if (b->auth_info.flavor_len > 0 &&
2407 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2408 goto Ebusy;
2409 return 1;
2410Ebusy:
2411 return 0;
2412}
2413
2414struct nfs_sb_mountdata {
2415 struct nfs_server *server;
2416 int mntflags;
2417};
2418
2419static int nfs_set_super(struct super_block *s, void *data)
2420{
2421 struct nfs_sb_mountdata *sb_mntdata = data;
2422 struct nfs_server *server = sb_mntdata->server;
2423 int ret;
2424
2425 s->s_flags = sb_mntdata->mntflags;
2426 s->s_fs_info = server;
2427 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2428 ret = set_anon_super(s, server);
2429 if (ret == 0)
2430 server->s_dev = s->s_dev;
2431 return ret;
2432}
2433
2434static int nfs_compare_super_address(struct nfs_server *server1,
2435 struct nfs_server *server2)
2436{
2437 struct sockaddr *sap1, *sap2;
2438 struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2439 struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2440
2441 if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2442 return 0;
2443
2444 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2445 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2446
2447 if (sap1->sa_family != sap2->sa_family)
2448 return 0;
2449
2450 switch (sap1->sa_family) {
2451 case AF_INET: {
2452 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2453 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2454 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2455 return 0;
2456 if (sin1->sin_port != sin2->sin_port)
2457 return 0;
2458 break;
2459 }
2460 case AF_INET6: {
2461 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2462 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2463 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2464 return 0;
2465 if (sin1->sin6_port != sin2->sin6_port)
2466 return 0;
2467 break;
2468 }
2469 default:
2470 return 0;
2471 }
2472
2473 return 1;
2474}
2475
2476static int nfs_compare_super(struct super_block *sb, void *data)
2477{
2478 struct nfs_sb_mountdata *sb_mntdata = data;
2479 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2480 int mntflags = sb_mntdata->mntflags;
2481
2482 if (!nfs_compare_super_address(old, server))
2483 return 0;
2484 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2485 if (old->flags & NFS_MOUNT_UNSHARED)
2486 return 0;
2487 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2488 return 0;
2489 return nfs_compare_mount_options(sb, server, mntflags);
2490}
2491
2492#ifdef CONFIG_NFS_FSCACHE
2493static void nfs_get_cache_cookie(struct super_block *sb,
2494 struct nfs_parsed_mount_data *parsed,
2495 struct nfs_clone_mount *cloned)
2496{
2497 struct nfs_server *nfss = NFS_SB(sb);
2498 char *uniq = NULL;
2499 int ulen = 0;
2500
2501 nfss->fscache_key = NULL;
2502 nfss->fscache = NULL;
2503
2504 if (parsed) {
2505 if (!(parsed->options & NFS_OPTION_FSCACHE))
2506 return;
2507 if (parsed->fscache_uniq) {
2508 uniq = parsed->fscache_uniq;
2509 ulen = strlen(parsed->fscache_uniq);
2510 }
2511 } else if (cloned) {
2512 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2513 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2514 return;
2515 if (mnt_s->fscache_key) {
2516 uniq = mnt_s->fscache_key->key.uniquifier;
2517 ulen = mnt_s->fscache_key->key.uniq_len;
2518 };
2519 } else
2520 return;
2521
2522 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2523}
2524#else
2525static void nfs_get_cache_cookie(struct super_block *sb,
2526 struct nfs_parsed_mount_data *parsed,
2527 struct nfs_clone_mount *cloned)
2528{
2529}
2530#endif
2531
2532static int nfs_bdi_register(struct nfs_server *server)
2533{
2534 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2535}
2536
2537int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2538 struct nfs_mount_info *mount_info)
2539{
2540 int error;
2541 unsigned long kflags = 0, kflags_out = 0;
2542 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2543 kflags |= SECURITY_LSM_NATIVE_LABELS;
2544
2545 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2546 kflags, &kflags_out);
2547 if (error)
2548 goto err;
2549
2550 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2551 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2552 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2553err:
2554 return error;
2555}
2556EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2557
2558int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2559 struct nfs_mount_info *mount_info)
2560{
2561 /* clone any lsm security options from the parent to the new sb */
2562 if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2563 return -ESTALE;
2564 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2565}
2566EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2567
2568struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2569 int flags, const char *dev_name,
2570 struct nfs_mount_info *mount_info,
2571 struct nfs_subversion *nfs_mod)
2572{
2573 struct super_block *s;
2574 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2575 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2576 struct nfs_sb_mountdata sb_mntdata = {
2577 .mntflags = flags,
2578 .server = server,
2579 };
2580 int error;
2581
2582 if (server->flags & NFS_MOUNT_UNSHARED)
2583 compare_super = NULL;
2584
2585 /* -o noac implies -o sync */
2586 if (server->flags & NFS_MOUNT_NOAC)
2587 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2588
2589 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2590 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2591 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2592
2593 /* Get a superblock - note that we may end up sharing one that already exists */
2594 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2595 if (IS_ERR(s)) {
2596 mntroot = ERR_CAST(s);
2597 goto out_err_nosb;
2598 }
2599
2600 if (s->s_fs_info != server) {
2601 nfs_free_server(server);
2602 server = NULL;
2603 } else {
2604 error = nfs_bdi_register(server);
2605 if (error) {
2606 mntroot = ERR_PTR(error);
2607 goto error_splat_super;
2608 }
2609 server->super = s;
2610 }
2611
2612 if (!s->s_root) {
2613 /* initial superblock/root creation */
2614 mount_info->fill_super(s, mount_info);
2615 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2616 }
2617
2618 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2619 if (IS_ERR(mntroot))
2620 goto error_splat_super;
2621
2622 error = mount_info->set_security(s, mntroot, mount_info);
2623 if (error)
2624 goto error_splat_root;
2625
2626 s->s_flags |= MS_ACTIVE;
2627
2628out:
2629 return mntroot;
2630
2631out_err_nosb:
2632 nfs_free_server(server);
2633 goto out;
2634
2635error_splat_root:
2636 dput(mntroot);
2637 mntroot = ERR_PTR(error);
2638error_splat_super:
2639 deactivate_locked_super(s);
2640 goto out;
2641}
2642EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2643
2644struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2645 int flags, const char *dev_name, void *raw_data)
2646{
2647 struct nfs_mount_info mount_info = {
2648 .fill_super = nfs_fill_super,
2649 .set_security = nfs_set_sb_security,
2650 };
2651 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2652 struct nfs_subversion *nfs_mod;
2653 int error;
2654
2655 mount_info.parsed = nfs_alloc_parsed_mount_data();
2656 mount_info.mntfh = nfs_alloc_fhandle();
2657 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2658 goto out;
2659
2660 /* Validate the mount data */
2661 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2662 if (error == NFS_TEXT_DATA)
2663 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2664 if (error < 0) {
2665 mntroot = ERR_PTR(error);
2666 goto out;
2667 }
2668
2669 nfs_mod = get_nfs_version(mount_info.parsed->version);
2670 if (IS_ERR(nfs_mod)) {
2671 mntroot = ERR_CAST(nfs_mod);
2672 goto out;
2673 }
2674
2675 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2676
2677 put_nfs_version(nfs_mod);
2678out:
2679 nfs_free_parsed_mount_data(mount_info.parsed);
2680 nfs_free_fhandle(mount_info.mntfh);
2681 return mntroot;
2682}
2683EXPORT_SYMBOL_GPL(nfs_fs_mount);
2684
2685/*
2686 * Destroy an NFS2/3 superblock
2687 */
2688void nfs_kill_super(struct super_block *s)
2689{
2690 struct nfs_server *server = NFS_SB(s);
2691 dev_t dev = s->s_dev;
2692
2693 generic_shutdown_super(s);
2694
2695 nfs_fscache_release_super_cookie(s);
2696
2697 nfs_free_server(server);
2698 free_anon_bdev(dev);
2699}
2700EXPORT_SYMBOL_GPL(nfs_kill_super);
2701
2702/*
2703 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2704 */
2705static struct dentry *
2706nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2707 const char *dev_name, void *raw_data)
2708{
2709 struct nfs_clone_mount *data = raw_data;
2710 struct nfs_mount_info mount_info = {
2711 .fill_super = nfs_clone_super,
2712 .set_security = nfs_clone_sb_security,
2713 .cloned = data,
2714 };
2715 struct nfs_server *server;
2716 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2717 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2718
2719 dprintk("--> nfs_xdev_mount()\n");
2720
2721 mount_info.mntfh = mount_info.cloned->fh;
2722
2723 /* create a new volume representation */
2724 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2725
2726 if (IS_ERR(server))
2727 mntroot = ERR_CAST(server);
2728 else
2729 mntroot = nfs_fs_mount_common(server, flags,
2730 dev_name, &mount_info, nfs_mod);
2731
2732 dprintk("<-- nfs_xdev_mount() = %ld\n",
2733 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2734 return mntroot;
2735}
2736
2737#if IS_ENABLED(CONFIG_NFS_V4)
2738
2739static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2740{
2741 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2742 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2743}
2744
2745/*
2746 * Validate NFSv4 mount options
2747 */
2748static int nfs4_validate_mount_data(void *options,
2749 struct nfs_parsed_mount_data *args,
2750 const char *dev_name)
2751{
2752 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2753 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2754 char *c;
2755
2756 if (data == NULL)
2757 goto out_no_data;
2758
2759 args->version = 4;
2760
2761 switch (data->version) {
2762 case 1:
2763 if (data->host_addrlen > sizeof(args->nfs_server.address))
2764 goto out_no_address;
2765 if (data->host_addrlen == 0)
2766 goto out_no_address;
2767 args->nfs_server.addrlen = data->host_addrlen;
2768 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2769 return -EFAULT;
2770 if (!nfs_verify_server_address(sap))
2771 goto out_no_address;
2772 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2773
2774 if (data->auth_flavourlen) {
2775 rpc_authflavor_t pseudoflavor;
2776 if (data->auth_flavourlen > 1)
2777 goto out_inval_auth;
2778 if (copy_from_user(&pseudoflavor,
2779 data->auth_flavours,
2780 sizeof(pseudoflavor)))
2781 return -EFAULT;
2782 args->selected_flavor = pseudoflavor;
2783 } else
2784 args->selected_flavor = RPC_AUTH_UNIX;
2785
2786 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2787 if (IS_ERR(c))
2788 return PTR_ERR(c);
2789 args->nfs_server.hostname = c;
2790
2791 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2792 if (IS_ERR(c))
2793 return PTR_ERR(c);
2794 args->nfs_server.export_path = c;
2795 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2796
2797 c = strndup_user(data->client_addr.data, 16);
2798 if (IS_ERR(c))
2799 return PTR_ERR(c);
2800 args->client_address = c;
2801
2802 /*
2803 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2804 * can deal with.
2805 */
2806
2807 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2808 args->rsize = data->rsize;
2809 args->wsize = data->wsize;
2810 args->timeo = data->timeo;
2811 args->retrans = data->retrans;
2812 args->acregmin = data->acregmin;
2813 args->acregmax = data->acregmax;
2814 args->acdirmin = data->acdirmin;
2815 args->acdirmax = data->acdirmax;
2816 args->nfs_server.protocol = data->proto;
2817 nfs_validate_transport_protocol(args);
2818 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2819 goto out_invalid_transport_udp;
2820
2821 break;
2822 default:
2823 return NFS_TEXT_DATA;
2824 }
2825
2826 return 0;
2827
2828out_no_data:
2829 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2830 return -EINVAL;
2831
2832out_inval_auth:
2833 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2834 data->auth_flavourlen);
2835 return -EINVAL;
2836
2837out_no_address:
2838 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2839 return -EINVAL;
2840
2841out_invalid_transport_udp:
2842 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2843 return -EINVAL;
2844}
2845
2846/*
2847 * NFS v4 module parameters need to stay in the
2848 * NFS client for backwards compatibility
2849 */
2850unsigned int nfs_callback_set_tcpport;
2851unsigned short nfs_callback_nr_threads;
2852/* Default cache timeout is 10 minutes */
2853unsigned int nfs_idmap_cache_timeout = 600;
2854/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2855bool nfs4_disable_idmapping = true;
2856unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2857unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2858unsigned short send_implementation_id = 1;
2859char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2860bool recover_lost_locks = false;
2861
2862EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2863EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2864EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2865EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2866EXPORT_SYMBOL_GPL(max_session_slots);
2867EXPORT_SYMBOL_GPL(max_session_cb_slots);
2868EXPORT_SYMBOL_GPL(send_implementation_id);
2869EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2870EXPORT_SYMBOL_GPL(recover_lost_locks);
2871
2872#define NFS_CALLBACK_MAXPORTNR (65535U)
2873
2874static int param_set_portnr(const char *val, const struct kernel_param *kp)
2875{
2876 unsigned long num;
2877 int ret;
2878
2879 if (!val)
2880 return -EINVAL;
2881 ret = kstrtoul(val, 0, &num);
2882 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2883 return -EINVAL;
2884 *((unsigned int *)kp->arg) = num;
2885 return 0;
2886}
2887static const struct kernel_param_ops param_ops_portnr = {
2888 .set = param_set_portnr,
2889 .get = param_get_uint,
2890};
2891#define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2892
2893module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2894module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2895MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2896 "assigned to the NFSv4 callback channels.");
2897module_param(nfs_idmap_cache_timeout, int, 0644);
2898module_param(nfs4_disable_idmapping, bool, 0644);
2899module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2900 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2901MODULE_PARM_DESC(nfs4_disable_idmapping,
2902 "Turn off NFSv4 idmapping when using 'sec=sys'");
2903module_param(max_session_slots, ushort, 0644);
2904MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2905 "requests the client will negotiate");
2906module_param(max_session_cb_slots, ushort, 0644);
2907MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
2908 "callbacks the client will process for a given server");
2909module_param(send_implementation_id, ushort, 0644);
2910MODULE_PARM_DESC(send_implementation_id,
2911 "Send implementation ID with NFSv4.1 exchange_id");
2912MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2913
2914module_param(recover_lost_locks, bool, 0644);
2915MODULE_PARM_DESC(recover_lost_locks,
2916 "If the server reports that a lock might be lost, "
2917 "try to recover it risking data corruption.");
2918
2919
2920#endif /* CONFIG_NFS_V4 */
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/mnt_namespace.h>
45#include <linux/namei.h>
46#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
49#include <linux/in6.h>
50#include <linux/slab.h>
51#include <net/ipv6.h>
52#include <linux/netdevice.h>
53#include <linux/nfs_xdr.h>
54#include <linux/magic.h>
55#include <linux/parser.h>
56
57#include <asm/system.h>
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
70#ifdef CONFIG_NFS_V3
71#define NFS_DEFAULT_VERSION 3
72#else
73#define NFS_DEFAULT_VERSION 2
74#endif
75
76enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
83 Opt_v2, Opt_v3, Opt_v4,
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_nfsvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
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
117static 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_v2, "v2" },
137 { Opt_v3, "v3" },
138 { Opt_v4, "v4" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152
153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
176 { Opt_mounthost, "mounthost=%s" },
177 { Opt_mountaddr, "mountaddr=%s" },
178
179 { Opt_lookupcache, "lookupcache=%s" },
180 { Opt_fscache_uniq, "fsc=%s" },
181 { Opt_local_lock, "local_lock=%s" },
182
183 { Opt_err, NULL }
184};
185
186enum {
187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
188
189 Opt_xprt_err
190};
191
192static const match_table_t nfs_xprt_protocol_tokens = {
193 { Opt_xprt_udp, "udp" },
194 { Opt_xprt_udp6, "udp6" },
195 { Opt_xprt_tcp, "tcp" },
196 { Opt_xprt_tcp6, "tcp6" },
197 { Opt_xprt_rdma, "rdma" },
198
199 { Opt_xprt_err, NULL }
200};
201
202enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209};
210
211static const match_table_t nfs_secflavor_tokens = {
212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
228 { Opt_sec_err, NULL }
229};
230
231enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236};
237
238static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245};
246
247enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252};
253
254static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261};
262
263
264static void nfs_umount_begin(struct super_block *);
265static int nfs_statfs(struct dentry *, struct kstatfs *);
266static int nfs_show_options(struct seq_file *, struct vfsmount *);
267static int nfs_show_devname(struct seq_file *, struct vfsmount *);
268static int nfs_show_path(struct seq_file *, struct vfsmount *);
269static int nfs_show_stats(struct seq_file *, struct vfsmount *);
270static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
272static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
274static void nfs_put_super(struct super_block *);
275static void nfs_kill_super(struct super_block *);
276static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
277
278static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
281 .mount = nfs_fs_mount,
282 .kill_sb = nfs_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
284};
285
286struct file_system_type nfs_xdev_fs_type = {
287 .owner = THIS_MODULE,
288 .name = "nfs",
289 .mount = nfs_xdev_mount,
290 .kill_sb = nfs_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
292};
293
294static const struct super_operations nfs_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .put_super = nfs_put_super,
299 .statfs = nfs_statfs,
300 .evict_inode = nfs_evict_inode,
301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
305 .show_stats = nfs_show_stats,
306 .remount_fs = nfs_remount,
307};
308
309#ifdef CONFIG_NFS_V4
310static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
312static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
322static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
324static void nfs4_kill_super(struct super_block *sb);
325
326static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .mount = nfs4_mount,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332};
333
334static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
337 .mount = nfs4_remote_mount,
338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340};
341
342struct file_system_type nfs4_xdev_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_xdev_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348};
349
350static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_referral_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356};
357
358struct file_system_type nfs4_referral_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_referral_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364};
365
366static const struct super_operations nfs4_sops = {
367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
370 .put_super = nfs_put_super,
371 .statfs = nfs_statfs,
372 .evict_inode = nfs4_evict_inode,
373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
377 .show_stats = nfs_show_stats,
378 .remount_fs = nfs_remount,
379};
380#endif
381
382static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385};
386
387/*
388 * Register the NFS filesystems
389 */
390int __init register_nfs_fs(void)
391{
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
401#ifdef CONFIG_NFS_V4
402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405#endif
406 register_shrinker(&acl_shrinker);
407 return 0;
408
409#ifdef CONFIG_NFS_V4
410error_2:
411 nfs_unregister_sysctl();
412#endif
413error_1:
414 unregister_filesystem(&nfs_fs_type);
415error_0:
416 return ret;
417}
418
419/*
420 * Unregister the NFS filesystems
421 */
422void __exit unregister_nfs_fs(void)
423{
424 unregister_shrinker(&acl_shrinker);
425#ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
427#endif
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type);
430}
431
432void nfs_sb_active(struct super_block *sb)
433{
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
438}
439
440void nfs_sb_deactive(struct super_block *sb)
441{
442 struct nfs_server *server = NFS_SB(sb);
443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
446}
447
448/*
449 * Deliver file system statistics to userspace
450 */
451static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
452{
453 struct nfs_server *server = NFS_SB(dentry->d_sb);
454 unsigned char blockbits;
455 unsigned long blockres;
456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
463
464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
474 nfs_free_fattr(res.fattr);
475 if (error < 0)
476 goto out_err;
477
478 buf->f_type = NFS_SUPER_MAGIC;
479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
485 buf->f_frsize = dentry->d_sb->s_blocksize;
486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
505
506 return 0;
507
508 out_err:
509 dprintk("%s: statfs error = %d\n", __func__, -error);
510 return error;
511}
512
513/*
514 * Map the security flavour number to a name
515 */
516static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517{
518 static const struct {
519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
533 { UINT_MAX, "unknown" }
534 };
535 int i;
536
537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542}
543
544static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546{
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581}
582
583static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585{
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
614 nfs_show_mountd_netid(m, nfss, showdefaults);
615}
616
617#ifdef CONFIG_NFS_V4
618static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620{
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625}
626#else
627static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629{
630}
631#endif
632
633/*
634 * Describe the mount options in force on this server representation
635 */
636static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
638{
639 static const struct proc_nfs_info {
640 int flag;
641 const char *str;
642 const char *nostr;
643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX, ",posix", "" },
646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
653 { 0, NULL, NULL }
654 };
655 const struct proc_nfs_info *nfs_infop;
656 struct nfs_client *clp = nfss->nfs_client;
657 u32 version = clp->rpc_ops->version;
658 int local_flock, local_fcntl;
659
660 seq_printf(m, ",vers=%u", version);
661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
680 seq_printf(m, ",proto=%s",
681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
719}
720
721/*
722 * Describe the mount options on this VFS mountpoint
723 */
724static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
725{
726 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
727
728 nfs_show_mount_options(m, nfss, 0);
729
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733
734 return 0;
735}
736#ifdef CONFIG_NFS_V4_1
737void show_sessions(struct seq_file *m, struct nfs_server *server)
738{
739 if (nfs4_has_session(server->nfs_client))
740 seq_printf(m, ",sessions");
741}
742#else
743void show_sessions(struct seq_file *m, struct nfs_server *server) {}
744#endif
745
746#ifdef CONFIG_NFS_V4_1
747void show_pnfs(struct seq_file *m, struct nfs_server *server)
748{
749 seq_printf(m, ",pnfs=");
750 if (server->pnfs_curr_ld)
751 seq_printf(m, "%s", server->pnfs_curr_ld->name);
752 else
753 seq_printf(m, "not configured");
754}
755#else /* CONFIG_NFS_V4_1 */
756void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
757#endif /* CONFIG_NFS_V4_1 */
758
759static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
760{
761 char *page = (char *) __get_free_page(GFP_KERNEL);
762 char *devname, *dummy;
763 int err = 0;
764 if (!page)
765 return -ENOMEM;
766 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
767 if (IS_ERR(devname))
768 err = PTR_ERR(devname);
769 else
770 seq_escape(m, devname, " \t\n\\");
771 free_page((unsigned long)page);
772 return err;
773}
774
775static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
776{
777 seq_puts(m, "/");
778 return 0;
779}
780
781/*
782 * Present statistical information for this VFS mountpoint
783 */
784static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
785{
786 int i, cpu;
787 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
788 struct rpc_auth *auth = nfss->client->cl_auth;
789 struct nfs_iostats totals = { };
790
791 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
792
793 /*
794 * Display all mount option settings
795 */
796 seq_printf(m, "\n\topts:\t");
797 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
798 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
799 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
800 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
801 nfs_show_mount_options(m, nfss, 1);
802
803 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
804
805 seq_printf(m, "\n\tcaps:\t");
806 seq_printf(m, "caps=0x%x", nfss->caps);
807 seq_printf(m, ",wtmult=%u", nfss->wtmult);
808 seq_printf(m, ",dtsize=%u", nfss->dtsize);
809 seq_printf(m, ",bsize=%u", nfss->bsize);
810 seq_printf(m, ",namlen=%u", nfss->namelen);
811
812#ifdef CONFIG_NFS_V4
813 if (nfss->nfs_client->rpc_ops->version == 4) {
814 seq_printf(m, "\n\tnfsv4:\t");
815 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
816 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
817 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
818 show_sessions(m, nfss);
819 show_pnfs(m, nfss);
820 }
821#endif
822
823 /*
824 * Display security flavor in effect for this mount
825 */
826 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
827 if (auth->au_flavor)
828 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
829
830 /*
831 * Display superblock I/O counters
832 */
833 for_each_possible_cpu(cpu) {
834 struct nfs_iostats *stats;
835
836 preempt_disable();
837 stats = per_cpu_ptr(nfss->io_stats, cpu);
838
839 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
840 totals.events[i] += stats->events[i];
841 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
842 totals.bytes[i] += stats->bytes[i];
843#ifdef CONFIG_NFS_FSCACHE
844 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
845 totals.fscache[i] += stats->fscache[i];
846#endif
847
848 preempt_enable();
849 }
850
851 seq_printf(m, "\n\tevents:\t");
852 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
853 seq_printf(m, "%lu ", totals.events[i]);
854 seq_printf(m, "\n\tbytes:\t");
855 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
856 seq_printf(m, "%Lu ", totals.bytes[i]);
857#ifdef CONFIG_NFS_FSCACHE
858 if (nfss->options & NFS_OPTION_FSCACHE) {
859 seq_printf(m, "\n\tfsc:\t");
860 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
862 }
863#endif
864 seq_printf(m, "\n");
865
866 rpc_print_iostats(m, nfss->client);
867
868 return 0;
869}
870
871/*
872 * Begin unmount by attempting to remove all automounted mountpoints we added
873 * in response to xdev traversals and referrals
874 */
875static void nfs_umount_begin(struct super_block *sb)
876{
877 struct nfs_server *server;
878 struct rpc_clnt *rpc;
879
880 server = NFS_SB(sb);
881 /* -EIO all pending I/O */
882 rpc = server->client_acl;
883 if (!IS_ERR(rpc))
884 rpc_killall_tasks(rpc);
885 rpc = server->client;
886 if (!IS_ERR(rpc))
887 rpc_killall_tasks(rpc);
888}
889
890static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
891{
892 struct nfs_parsed_mount_data *data;
893
894 data = kzalloc(sizeof(*data), GFP_KERNEL);
895 if (data) {
896 data->acregmin = NFS_DEF_ACREGMIN;
897 data->acregmax = NFS_DEF_ACREGMAX;
898 data->acdirmin = NFS_DEF_ACDIRMIN;
899 data->acdirmax = NFS_DEF_ACDIRMAX;
900 data->mount_server.port = NFS_UNSPEC_PORT;
901 data->nfs_server.port = NFS_UNSPEC_PORT;
902 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
903 data->auth_flavors[0] = RPC_AUTH_UNIX;
904 data->auth_flavor_len = 1;
905 data->version = version;
906 data->minorversion = 0;
907 }
908 return data;
909}
910
911/*
912 * Sanity-check a server address provided by the mount command.
913 *
914 * Address family must be initialized, and address must not be
915 * the ANY address for that family.
916 */
917static int nfs_verify_server_address(struct sockaddr *addr)
918{
919 switch (addr->sa_family) {
920 case AF_INET: {
921 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
922 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
923 }
924 case AF_INET6: {
925 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
926 return !ipv6_addr_any(sa);
927 }
928 }
929
930 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
931 return 0;
932}
933
934/*
935 * Select between a default port value and a user-specified port value.
936 * If a zero value is set, then autobind will be used.
937 */
938static void nfs_set_port(struct sockaddr *sap, int *port,
939 const unsigned short default_port)
940{
941 if (*port == NFS_UNSPEC_PORT)
942 *port = default_port;
943
944 rpc_set_port(sap, *port);
945}
946
947/*
948 * Sanity check the NFS transport protocol.
949 *
950 */
951static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
952{
953 switch (mnt->nfs_server.protocol) {
954 case XPRT_TRANSPORT_UDP:
955 case XPRT_TRANSPORT_TCP:
956 case XPRT_TRANSPORT_RDMA:
957 break;
958 default:
959 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
960 }
961}
962
963/*
964 * For text based NFSv2/v3 mounts, the mount protocol transport default
965 * settings should depend upon the specified NFS transport.
966 */
967static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
968{
969 nfs_validate_transport_protocol(mnt);
970
971 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
972 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
973 return;
974 switch (mnt->nfs_server.protocol) {
975 case XPRT_TRANSPORT_UDP:
976 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
977 break;
978 case XPRT_TRANSPORT_TCP:
979 case XPRT_TRANSPORT_RDMA:
980 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
981 }
982}
983
984/*
985 * Parse the value of the 'sec=' option.
986 */
987static int nfs_parse_security_flavors(char *value,
988 struct nfs_parsed_mount_data *mnt)
989{
990 substring_t args[MAX_OPT_ARGS];
991
992 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
993
994 switch (match_token(value, nfs_secflavor_tokens, args)) {
995 case Opt_sec_none:
996 mnt->auth_flavors[0] = RPC_AUTH_NULL;
997 break;
998 case Opt_sec_sys:
999 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1000 break;
1001 case Opt_sec_krb5:
1002 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1003 break;
1004 case Opt_sec_krb5i:
1005 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1006 break;
1007 case Opt_sec_krb5p:
1008 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1009 break;
1010 case Opt_sec_lkey:
1011 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1012 break;
1013 case Opt_sec_lkeyi:
1014 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1015 break;
1016 case Opt_sec_lkeyp:
1017 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1018 break;
1019 case Opt_sec_spkm:
1020 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1021 break;
1022 case Opt_sec_spkmi:
1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1024 break;
1025 case Opt_sec_spkmp:
1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1027 break;
1028 default:
1029 return 0;
1030 }
1031
1032 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1033 mnt->auth_flavor_len = 1;
1034 return 1;
1035}
1036
1037static int nfs_get_option_str(substring_t args[], char **option)
1038{
1039 kfree(*option);
1040 *option = match_strdup(args);
1041 return !option;
1042}
1043
1044static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1045{
1046 int rc;
1047 char *string;
1048
1049 string = match_strdup(args);
1050 if (string == NULL)
1051 return -ENOMEM;
1052 rc = strict_strtoul(string, 10, option);
1053 kfree(string);
1054
1055 return rc;
1056}
1057
1058/*
1059 * Error-check and convert a string of mount options from user space into
1060 * a data structure. The whole mount string is processed; bad options are
1061 * skipped as they are encountered. If there were no errors, return 1;
1062 * otherwise return 0 (zero).
1063 */
1064static int nfs_parse_mount_options(char *raw,
1065 struct nfs_parsed_mount_data *mnt)
1066{
1067 char *p, *string, *secdata;
1068 int rc, sloppy = 0, invalid_option = 0;
1069 unsigned short protofamily = AF_UNSPEC;
1070 unsigned short mountfamily = AF_UNSPEC;
1071
1072 if (!raw) {
1073 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1074 return 1;
1075 }
1076 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1077
1078 secdata = alloc_secdata();
1079 if (!secdata)
1080 goto out_nomem;
1081
1082 rc = security_sb_copy_data(raw, secdata);
1083 if (rc)
1084 goto out_security_failure;
1085
1086 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1087 if (rc)
1088 goto out_security_failure;
1089
1090 free_secdata(secdata);
1091
1092 while ((p = strsep(&raw, ",")) != NULL) {
1093 substring_t args[MAX_OPT_ARGS];
1094 unsigned long option;
1095 int token;
1096
1097 if (!*p)
1098 continue;
1099
1100 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1101
1102 token = match_token(p, nfs_mount_option_tokens, args);
1103 switch (token) {
1104
1105 /*
1106 * boolean options: foo/nofoo
1107 */
1108 case Opt_soft:
1109 mnt->flags |= NFS_MOUNT_SOFT;
1110 break;
1111 case Opt_hard:
1112 mnt->flags &= ~NFS_MOUNT_SOFT;
1113 break;
1114 case Opt_posix:
1115 mnt->flags |= NFS_MOUNT_POSIX;
1116 break;
1117 case Opt_noposix:
1118 mnt->flags &= ~NFS_MOUNT_POSIX;
1119 break;
1120 case Opt_cto:
1121 mnt->flags &= ~NFS_MOUNT_NOCTO;
1122 break;
1123 case Opt_nocto:
1124 mnt->flags |= NFS_MOUNT_NOCTO;
1125 break;
1126 case Opt_ac:
1127 mnt->flags &= ~NFS_MOUNT_NOAC;
1128 break;
1129 case Opt_noac:
1130 mnt->flags |= NFS_MOUNT_NOAC;
1131 break;
1132 case Opt_lock:
1133 mnt->flags &= ~NFS_MOUNT_NONLM;
1134 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1135 NFS_MOUNT_LOCAL_FCNTL);
1136 break;
1137 case Opt_nolock:
1138 mnt->flags |= NFS_MOUNT_NONLM;
1139 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1140 NFS_MOUNT_LOCAL_FCNTL);
1141 break;
1142 case Opt_v2:
1143 mnt->flags &= ~NFS_MOUNT_VER3;
1144 mnt->version = 2;
1145 break;
1146 case Opt_v3:
1147 mnt->flags |= NFS_MOUNT_VER3;
1148 mnt->version = 3;
1149 break;
1150 case Opt_v4:
1151 mnt->flags &= ~NFS_MOUNT_VER3;
1152 mnt->version = 4;
1153 break;
1154 case Opt_udp:
1155 mnt->flags &= ~NFS_MOUNT_TCP;
1156 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1157 break;
1158 case Opt_tcp:
1159 mnt->flags |= NFS_MOUNT_TCP;
1160 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1161 break;
1162 case Opt_rdma:
1163 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1164 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1165 xprt_load_transport(p);
1166 break;
1167 case Opt_acl:
1168 mnt->flags &= ~NFS_MOUNT_NOACL;
1169 break;
1170 case Opt_noacl:
1171 mnt->flags |= NFS_MOUNT_NOACL;
1172 break;
1173 case Opt_rdirplus:
1174 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1175 break;
1176 case Opt_nordirplus:
1177 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1178 break;
1179 case Opt_sharecache:
1180 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1181 break;
1182 case Opt_nosharecache:
1183 mnt->flags |= NFS_MOUNT_UNSHARED;
1184 break;
1185 case Opt_resvport:
1186 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1187 break;
1188 case Opt_noresvport:
1189 mnt->flags |= NFS_MOUNT_NORESVPORT;
1190 break;
1191 case Opt_fscache:
1192 mnt->options |= NFS_OPTION_FSCACHE;
1193 kfree(mnt->fscache_uniq);
1194 mnt->fscache_uniq = NULL;
1195 break;
1196 case Opt_nofscache:
1197 mnt->options &= ~NFS_OPTION_FSCACHE;
1198 kfree(mnt->fscache_uniq);
1199 mnt->fscache_uniq = NULL;
1200 break;
1201
1202 /*
1203 * options that take numeric values
1204 */
1205 case Opt_port:
1206 if (nfs_get_option_ul(args, &option) ||
1207 option > USHRT_MAX)
1208 goto out_invalid_value;
1209 mnt->nfs_server.port = option;
1210 break;
1211 case Opt_rsize:
1212 if (nfs_get_option_ul(args, &option))
1213 goto out_invalid_value;
1214 mnt->rsize = option;
1215 break;
1216 case Opt_wsize:
1217 if (nfs_get_option_ul(args, &option))
1218 goto out_invalid_value;
1219 mnt->wsize = option;
1220 break;
1221 case Opt_bsize:
1222 if (nfs_get_option_ul(args, &option))
1223 goto out_invalid_value;
1224 mnt->bsize = option;
1225 break;
1226 case Opt_timeo:
1227 if (nfs_get_option_ul(args, &option) || option == 0)
1228 goto out_invalid_value;
1229 mnt->timeo = option;
1230 break;
1231 case Opt_retrans:
1232 if (nfs_get_option_ul(args, &option) || option == 0)
1233 goto out_invalid_value;
1234 mnt->retrans = option;
1235 break;
1236 case Opt_acregmin:
1237 if (nfs_get_option_ul(args, &option))
1238 goto out_invalid_value;
1239 mnt->acregmin = option;
1240 break;
1241 case Opt_acregmax:
1242 if (nfs_get_option_ul(args, &option))
1243 goto out_invalid_value;
1244 mnt->acregmax = option;
1245 break;
1246 case Opt_acdirmin:
1247 if (nfs_get_option_ul(args, &option))
1248 goto out_invalid_value;
1249 mnt->acdirmin = option;
1250 break;
1251 case Opt_acdirmax:
1252 if (nfs_get_option_ul(args, &option))
1253 goto out_invalid_value;
1254 mnt->acdirmax = option;
1255 break;
1256 case Opt_actimeo:
1257 if (nfs_get_option_ul(args, &option))
1258 goto out_invalid_value;
1259 mnt->acregmin = mnt->acregmax =
1260 mnt->acdirmin = mnt->acdirmax = option;
1261 break;
1262 case Opt_namelen:
1263 if (nfs_get_option_ul(args, &option))
1264 goto out_invalid_value;
1265 mnt->namlen = option;
1266 break;
1267 case Opt_mountport:
1268 if (nfs_get_option_ul(args, &option) ||
1269 option > USHRT_MAX)
1270 goto out_invalid_value;
1271 mnt->mount_server.port = option;
1272 break;
1273 case Opt_mountvers:
1274 if (nfs_get_option_ul(args, &option) ||
1275 option < NFS_MNT_VERSION ||
1276 option > NFS_MNT3_VERSION)
1277 goto out_invalid_value;
1278 mnt->mount_server.version = option;
1279 break;
1280 case Opt_nfsvers:
1281 if (nfs_get_option_ul(args, &option))
1282 goto out_invalid_value;
1283 switch (option) {
1284 case NFS2_VERSION:
1285 mnt->flags &= ~NFS_MOUNT_VER3;
1286 mnt->version = 2;
1287 break;
1288 case NFS3_VERSION:
1289 mnt->flags |= NFS_MOUNT_VER3;
1290 mnt->version = 3;
1291 break;
1292 case NFS4_VERSION:
1293 mnt->flags &= ~NFS_MOUNT_VER3;
1294 mnt->version = 4;
1295 break;
1296 default:
1297 goto out_invalid_value;
1298 }
1299 break;
1300 case Opt_minorversion:
1301 if (nfs_get_option_ul(args, &option))
1302 goto out_invalid_value;
1303 if (option > NFS4_MAX_MINOR_VERSION)
1304 goto out_invalid_value;
1305 mnt->minorversion = option;
1306 break;
1307
1308 /*
1309 * options that take text values
1310 */
1311 case Opt_sec:
1312 string = match_strdup(args);
1313 if (string == NULL)
1314 goto out_nomem;
1315 rc = nfs_parse_security_flavors(string, mnt);
1316 kfree(string);
1317 if (!rc) {
1318 dfprintk(MOUNT, "NFS: unrecognized "
1319 "security flavor\n");
1320 return 0;
1321 }
1322 break;
1323 case Opt_proto:
1324 string = match_strdup(args);
1325 if (string == NULL)
1326 goto out_nomem;
1327 token = match_token(string,
1328 nfs_xprt_protocol_tokens, args);
1329
1330 protofamily = AF_INET;
1331 switch (token) {
1332 case Opt_xprt_udp6:
1333 protofamily = AF_INET6;
1334 case Opt_xprt_udp:
1335 mnt->flags &= ~NFS_MOUNT_TCP;
1336 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1337 break;
1338 case Opt_xprt_tcp6:
1339 protofamily = AF_INET6;
1340 case Opt_xprt_tcp:
1341 mnt->flags |= NFS_MOUNT_TCP;
1342 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1343 break;
1344 case Opt_xprt_rdma:
1345 /* vector side protocols to TCP */
1346 mnt->flags |= NFS_MOUNT_TCP;
1347 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1348 xprt_load_transport(string);
1349 break;
1350 default:
1351 dfprintk(MOUNT, "NFS: unrecognized "
1352 "transport protocol\n");
1353 kfree(string);
1354 return 0;
1355 }
1356 kfree(string);
1357 break;
1358 case Opt_mountproto:
1359 string = match_strdup(args);
1360 if (string == NULL)
1361 goto out_nomem;
1362 token = match_token(string,
1363 nfs_xprt_protocol_tokens, args);
1364 kfree(string);
1365
1366 mountfamily = AF_INET;
1367 switch (token) {
1368 case Opt_xprt_udp6:
1369 mountfamily = AF_INET6;
1370 case Opt_xprt_udp:
1371 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1372 break;
1373 case Opt_xprt_tcp6:
1374 mountfamily = AF_INET6;
1375 case Opt_xprt_tcp:
1376 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1377 break;
1378 case Opt_xprt_rdma: /* not used for side protocols */
1379 default:
1380 dfprintk(MOUNT, "NFS: unrecognized "
1381 "transport protocol\n");
1382 return 0;
1383 }
1384 break;
1385 case Opt_addr:
1386 string = match_strdup(args);
1387 if (string == NULL)
1388 goto out_nomem;
1389 mnt->nfs_server.addrlen =
1390 rpc_pton(string, strlen(string),
1391 (struct sockaddr *)
1392 &mnt->nfs_server.address,
1393 sizeof(mnt->nfs_server.address));
1394 kfree(string);
1395 if (mnt->nfs_server.addrlen == 0)
1396 goto out_invalid_address;
1397 break;
1398 case Opt_clientaddr:
1399 if (nfs_get_option_str(args, &mnt->client_address))
1400 goto out_nomem;
1401 break;
1402 case Opt_mounthost:
1403 if (nfs_get_option_str(args,
1404 &mnt->mount_server.hostname))
1405 goto out_nomem;
1406 break;
1407 case Opt_mountaddr:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 mnt->mount_server.addrlen =
1412 rpc_pton(string, strlen(string),
1413 (struct sockaddr *)
1414 &mnt->mount_server.address,
1415 sizeof(mnt->mount_server.address));
1416 kfree(string);
1417 if (mnt->mount_server.addrlen == 0)
1418 goto out_invalid_address;
1419 break;
1420 case Opt_lookupcache:
1421 string = match_strdup(args);
1422 if (string == NULL)
1423 goto out_nomem;
1424 token = match_token(string,
1425 nfs_lookupcache_tokens, args);
1426 kfree(string);
1427 switch (token) {
1428 case Opt_lookupcache_all:
1429 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1430 break;
1431 case Opt_lookupcache_positive:
1432 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1433 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1434 break;
1435 case Opt_lookupcache_none:
1436 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1437 break;
1438 default:
1439 dfprintk(MOUNT, "NFS: invalid "
1440 "lookupcache argument\n");
1441 return 0;
1442 };
1443 break;
1444 case Opt_fscache_uniq:
1445 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1446 goto out_nomem;
1447 mnt->options |= NFS_OPTION_FSCACHE;
1448 break;
1449 case Opt_local_lock:
1450 string = match_strdup(args);
1451 if (string == NULL)
1452 goto out_nomem;
1453 token = match_token(string, nfs_local_lock_tokens,
1454 args);
1455 kfree(string);
1456 switch (token) {
1457 case Opt_local_lock_all:
1458 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1459 NFS_MOUNT_LOCAL_FCNTL);
1460 break;
1461 case Opt_local_lock_flock:
1462 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1463 break;
1464 case Opt_local_lock_posix:
1465 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1466 break;
1467 case Opt_local_lock_none:
1468 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1469 NFS_MOUNT_LOCAL_FCNTL);
1470 break;
1471 default:
1472 dfprintk(MOUNT, "NFS: invalid "
1473 "local_lock argument\n");
1474 return 0;
1475 };
1476 break;
1477
1478 /*
1479 * Special options
1480 */
1481 case Opt_sloppy:
1482 sloppy = 1;
1483 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1484 break;
1485 case Opt_userspace:
1486 case Opt_deprecated:
1487 dfprintk(MOUNT, "NFS: ignoring mount option "
1488 "'%s'\n", p);
1489 break;
1490
1491 default:
1492 invalid_option = 1;
1493 dfprintk(MOUNT, "NFS: unrecognized mount option "
1494 "'%s'\n", p);
1495 }
1496 }
1497
1498 if (!sloppy && invalid_option)
1499 return 0;
1500
1501 /*
1502 * verify that any proto=/mountproto= options match the address
1503 * familiies in the addr=/mountaddr= options.
1504 */
1505 if (protofamily != AF_UNSPEC &&
1506 protofamily != mnt->nfs_server.address.ss_family)
1507 goto out_proto_mismatch;
1508
1509 if (mountfamily != AF_UNSPEC) {
1510 if (mnt->mount_server.addrlen) {
1511 if (mountfamily != mnt->mount_server.address.ss_family)
1512 goto out_mountproto_mismatch;
1513 } else {
1514 if (mountfamily != mnt->nfs_server.address.ss_family)
1515 goto out_mountproto_mismatch;
1516 }
1517 }
1518
1519 return 1;
1520
1521out_mountproto_mismatch:
1522 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1523 "option\n");
1524 return 0;
1525out_proto_mismatch:
1526 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1527 return 0;
1528out_invalid_address:
1529 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1530 return 0;
1531out_invalid_value:
1532 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1533 return 0;
1534out_nomem:
1535 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1536 return 0;
1537out_security_failure:
1538 free_secdata(secdata);
1539 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1540 return 0;
1541}
1542
1543/*
1544 * Match the requested auth flavors with the list returned by
1545 * the server. Returns zero and sets the mount's authentication
1546 * flavor on success; returns -EACCES if server does not support
1547 * the requested flavor.
1548 */
1549static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1550 struct nfs_mount_request *request)
1551{
1552 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1553
1554 /*
1555 * Certain releases of Linux's mountd return an empty
1556 * flavor list. To prevent behavioral regression with
1557 * these servers (ie. rejecting mounts that used to
1558 * succeed), revert to pre-2.6.32 behavior (no checking)
1559 * if the returned flavor list is empty.
1560 */
1561 if (server_authlist_len == 0)
1562 return 0;
1563
1564 /*
1565 * We avoid sophisticated negotiating here, as there are
1566 * plenty of cases where we can get it wrong, providing
1567 * either too little or too much security.
1568 *
1569 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1570 * flavor listed first. However, some servers list
1571 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1572 * preferred default, in args->auth_flavors[0] if user
1573 * didn't specify sec= mount option.
1574 */
1575 for (i = 0; i < args->auth_flavor_len; i++)
1576 for (j = 0; j < server_authlist_len; j++)
1577 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1578 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1579 request->auth_flavs[j]);
1580 args->auth_flavors[0] = request->auth_flavs[j];
1581 return 0;
1582 }
1583
1584 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1585 nfs_umount(request);
1586 return -EACCES;
1587}
1588
1589/*
1590 * Use the remote server's MOUNT service to request the NFS file handle
1591 * corresponding to the provided path.
1592 */
1593static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1594 struct nfs_fh *root_fh)
1595{
1596 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1597 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1598 struct nfs_mount_request request = {
1599 .sap = (struct sockaddr *)
1600 &args->mount_server.address,
1601 .dirpath = args->nfs_server.export_path,
1602 .protocol = args->mount_server.protocol,
1603 .fh = root_fh,
1604 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1605 .auth_flav_len = &server_authlist_len,
1606 .auth_flavs = server_authlist,
1607 };
1608 int status;
1609
1610 if (args->mount_server.version == 0) {
1611 switch (args->version) {
1612 default:
1613 args->mount_server.version = NFS_MNT3_VERSION;
1614 break;
1615 case 2:
1616 args->mount_server.version = NFS_MNT_VERSION;
1617 }
1618 }
1619 request.version = args->mount_server.version;
1620
1621 if (args->mount_server.hostname)
1622 request.hostname = args->mount_server.hostname;
1623 else
1624 request.hostname = args->nfs_server.hostname;
1625
1626 /*
1627 * Construct the mount server's address.
1628 */
1629 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1630 memcpy(request.sap, &args->nfs_server.address,
1631 args->nfs_server.addrlen);
1632 args->mount_server.addrlen = args->nfs_server.addrlen;
1633 }
1634 request.salen = args->mount_server.addrlen;
1635 nfs_set_port(request.sap, &args->mount_server.port, 0);
1636
1637 /*
1638 * Now ask the mount server to map our export path
1639 * to a file handle.
1640 */
1641 status = nfs_mount(&request);
1642 if (status != 0) {
1643 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1644 request.hostname, status);
1645 return status;
1646 }
1647
1648 /*
1649 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1650 */
1651 if (args->mount_server.version != NFS_MNT3_VERSION)
1652 return 0;
1653 return nfs_walk_authlist(args, &request);
1654}
1655
1656/*
1657 * Split "dev_name" into "hostname:export_path".
1658 *
1659 * The leftmost colon demarks the split between the server's hostname
1660 * and the export path. If the hostname starts with a left square
1661 * bracket, then it may contain colons.
1662 *
1663 * Note: caller frees hostname and export path, even on error.
1664 */
1665static int nfs_parse_devname(const char *dev_name,
1666 char **hostname, size_t maxnamlen,
1667 char **export_path, size_t maxpathlen)
1668{
1669 size_t len;
1670 char *end;
1671
1672 /* Is the host name protected with square brakcets? */
1673 if (*dev_name == '[') {
1674 end = strchr(++dev_name, ']');
1675 if (end == NULL || end[1] != ':')
1676 goto out_bad_devname;
1677
1678 len = end - dev_name;
1679 end++;
1680 } else {
1681 char *comma;
1682
1683 end = strchr(dev_name, ':');
1684 if (end == NULL)
1685 goto out_bad_devname;
1686 len = end - dev_name;
1687
1688 /* kill possible hostname list: not supported */
1689 comma = strchr(dev_name, ',');
1690 if (comma != NULL && comma < end)
1691 *comma = 0;
1692 }
1693
1694 if (len > maxnamlen)
1695 goto out_hostname;
1696
1697 /* N.B. caller will free nfs_server.hostname in all cases */
1698 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1699 if (*hostname == NULL)
1700 goto out_nomem;
1701 len = strlen(++end);
1702 if (len > maxpathlen)
1703 goto out_path;
1704 *export_path = kstrndup(end, len, GFP_KERNEL);
1705 if (!*export_path)
1706 goto out_nomem;
1707
1708 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1709 return 0;
1710
1711out_bad_devname:
1712 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1713 return -EINVAL;
1714
1715out_nomem:
1716 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1717 return -ENOMEM;
1718
1719out_hostname:
1720 dfprintk(MOUNT, "NFS: server hostname too long\n");
1721 return -ENAMETOOLONG;
1722
1723out_path:
1724 dfprintk(MOUNT, "NFS: export pathname too long\n");
1725 return -ENAMETOOLONG;
1726}
1727
1728/*
1729 * Validate the NFS2/NFS3 mount data
1730 * - fills in the mount root filehandle
1731 *
1732 * For option strings, user space handles the following behaviors:
1733 *
1734 * + DNS: mapping server host name to IP address ("addr=" option)
1735 *
1736 * + failure mode: how to behave if a mount request can't be handled
1737 * immediately ("fg/bg" option)
1738 *
1739 * + retry: how often to retry a mount request ("retry=" option)
1740 *
1741 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1742 * mountproto=tcp after mountproto=udp, and so on
1743 */
1744static int nfs_validate_mount_data(void *options,
1745 struct nfs_parsed_mount_data *args,
1746 struct nfs_fh *mntfh,
1747 const char *dev_name)
1748{
1749 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1750 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1751
1752 if (data == NULL)
1753 goto out_no_data;
1754
1755 switch (data->version) {
1756 case 1:
1757 data->namlen = 0;
1758 case 2:
1759 data->bsize = 0;
1760 case 3:
1761 if (data->flags & NFS_MOUNT_VER3)
1762 goto out_no_v3;
1763 data->root.size = NFS2_FHSIZE;
1764 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1765 case 4:
1766 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1767 goto out_no_sec;
1768 case 5:
1769 memset(data->context, 0, sizeof(data->context));
1770 case 6:
1771 if (data->flags & NFS_MOUNT_VER3) {
1772 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1773 goto out_invalid_fh;
1774 mntfh->size = data->root.size;
1775 args->version = 3;
1776 } else {
1777 mntfh->size = NFS2_FHSIZE;
1778 args->version = 2;
1779 }
1780
1781
1782 memcpy(mntfh->data, data->root.data, mntfh->size);
1783 if (mntfh->size < sizeof(mntfh->data))
1784 memset(mntfh->data + mntfh->size, 0,
1785 sizeof(mntfh->data) - mntfh->size);
1786
1787 /*
1788 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1789 * can deal with.
1790 */
1791 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1792 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1793 args->rsize = data->rsize;
1794 args->wsize = data->wsize;
1795 args->timeo = data->timeo;
1796 args->retrans = data->retrans;
1797 args->acregmin = data->acregmin;
1798 args->acregmax = data->acregmax;
1799 args->acdirmin = data->acdirmin;
1800 args->acdirmax = data->acdirmax;
1801
1802 memcpy(sap, &data->addr, sizeof(data->addr));
1803 args->nfs_server.addrlen = sizeof(data->addr);
1804 if (!nfs_verify_server_address(sap))
1805 goto out_no_address;
1806
1807 if (!(data->flags & NFS_MOUNT_TCP))
1808 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1809 /* N.B. caller will free nfs_server.hostname in all cases */
1810 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1811 args->namlen = data->namlen;
1812 args->bsize = data->bsize;
1813
1814 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1815 args->auth_flavors[0] = data->pseudoflavor;
1816 if (!args->nfs_server.hostname)
1817 goto out_nomem;
1818
1819 if (!(data->flags & NFS_MOUNT_NONLM))
1820 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1821 NFS_MOUNT_LOCAL_FCNTL);
1822 else
1823 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1824 NFS_MOUNT_LOCAL_FCNTL);
1825 /*
1826 * The legacy version 6 binary mount data from userspace has a
1827 * field used only to transport selinux information into the
1828 * the kernel. To continue to support that functionality we
1829 * have a touch of selinux knowledge here in the NFS code. The
1830 * userspace code converted context=blah to just blah so we are
1831 * converting back to the full string selinux understands.
1832 */
1833 if (data->context[0]){
1834#ifdef CONFIG_SECURITY_SELINUX
1835 int rc;
1836 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1837 if (!opts_str)
1838 return -ENOMEM;
1839 strcpy(opts_str, "context=");
1840 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1841 strcat(opts_str, &data->context[0]);
1842 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1843 kfree(opts_str);
1844 if (rc)
1845 return rc;
1846#else
1847 return -EINVAL;
1848#endif
1849 }
1850
1851 break;
1852 default: {
1853 int status;
1854
1855 if (nfs_parse_mount_options((char *)options, args) == 0)
1856 return -EINVAL;
1857
1858 if (!nfs_verify_server_address(sap))
1859 goto out_no_address;
1860
1861 if (args->version == 4)
1862#ifdef CONFIG_NFS_V4
1863 return nfs4_validate_text_mount_data(options,
1864 args, dev_name);
1865#else
1866 goto out_v4_not_compiled;
1867#endif
1868
1869 nfs_set_port(sap, &args->nfs_server.port, 0);
1870
1871 nfs_set_mount_transport_protocol(args);
1872
1873 status = nfs_parse_devname(dev_name,
1874 &args->nfs_server.hostname,
1875 PAGE_SIZE,
1876 &args->nfs_server.export_path,
1877 NFS_MAXPATHLEN);
1878 if (!status)
1879 status = nfs_try_mount(args, mntfh);
1880
1881 kfree(args->nfs_server.export_path);
1882 args->nfs_server.export_path = NULL;
1883
1884 if (status)
1885 return status;
1886
1887 break;
1888 }
1889 }
1890
1891#ifndef CONFIG_NFS_V3
1892 if (args->version == 3)
1893 goto out_v3_not_compiled;
1894#endif /* !CONFIG_NFS_V3 */
1895
1896 return 0;
1897
1898out_no_data:
1899 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1900 return -EINVAL;
1901
1902out_no_v3:
1903 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1904 data->version);
1905 return -EINVAL;
1906
1907out_no_sec:
1908 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1909 return -EINVAL;
1910
1911#ifndef CONFIG_NFS_V3
1912out_v3_not_compiled:
1913 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1914 return -EPROTONOSUPPORT;
1915#endif /* !CONFIG_NFS_V3 */
1916
1917#ifndef CONFIG_NFS_V4
1918out_v4_not_compiled:
1919 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1920 return -EPROTONOSUPPORT;
1921#endif /* !CONFIG_NFS_V4 */
1922
1923out_nomem:
1924 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1925 return -ENOMEM;
1926
1927out_no_address:
1928 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1929 return -EINVAL;
1930
1931out_invalid_fh:
1932 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1933 return -EINVAL;
1934}
1935
1936static int
1937nfs_compare_remount_data(struct nfs_server *nfss,
1938 struct nfs_parsed_mount_data *data)
1939{
1940 if (data->flags != nfss->flags ||
1941 data->rsize != nfss->rsize ||
1942 data->wsize != nfss->wsize ||
1943 data->retrans != nfss->client->cl_timeout->to_retries ||
1944 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1945 data->acregmin != nfss->acregmin / HZ ||
1946 data->acregmax != nfss->acregmax / HZ ||
1947 data->acdirmin != nfss->acdirmin / HZ ||
1948 data->acdirmax != nfss->acdirmax / HZ ||
1949 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1950 data->nfs_server.port != nfss->port ||
1951 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1952 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1953 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1954 return -EINVAL;
1955
1956 return 0;
1957}
1958
1959static int
1960nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1961{
1962 int error;
1963 struct nfs_server *nfss = sb->s_fs_info;
1964 struct nfs_parsed_mount_data *data;
1965 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1966 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1967 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1968
1969 /*
1970 * Userspace mount programs that send binary options generally send
1971 * them populated with default values. We have no way to know which
1972 * ones were explicitly specified. Fall back to legacy behavior and
1973 * just return success.
1974 */
1975 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1976 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1977 options->version <= 6))))
1978 return 0;
1979
1980 data = kzalloc(sizeof(*data), GFP_KERNEL);
1981 if (data == NULL)
1982 return -ENOMEM;
1983
1984 /* fill out struct with values from existing mount */
1985 data->flags = nfss->flags;
1986 data->rsize = nfss->rsize;
1987 data->wsize = nfss->wsize;
1988 data->retrans = nfss->client->cl_timeout->to_retries;
1989 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1990 data->acregmin = nfss->acregmin / HZ;
1991 data->acregmax = nfss->acregmax / HZ;
1992 data->acdirmin = nfss->acdirmin / HZ;
1993 data->acdirmax = nfss->acdirmax / HZ;
1994 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1995 data->nfs_server.port = nfss->port;
1996 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1997 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1998 data->nfs_server.addrlen);
1999
2000 /* overwrite those values with any that were specified */
2001 error = nfs_parse_mount_options((char *)options, data);
2002 if (error < 0)
2003 goto out;
2004
2005 /*
2006 * noac is a special case. It implies -o sync, but that's not
2007 * necessarily reflected in the mtab options. do_remount_sb
2008 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2009 * remount options, so we have to explicitly reset it.
2010 */
2011 if (data->flags & NFS_MOUNT_NOAC)
2012 *flags |= MS_SYNCHRONOUS;
2013
2014 /* compare new mount options with old ones */
2015 error = nfs_compare_remount_data(nfss, data);
2016out:
2017 kfree(data);
2018 return error;
2019}
2020
2021/*
2022 * Initialise the common bits of the superblock
2023 */
2024static inline void nfs_initialise_sb(struct super_block *sb)
2025{
2026 struct nfs_server *server = NFS_SB(sb);
2027
2028 sb->s_magic = NFS_SUPER_MAGIC;
2029
2030 /* We probably want something more informative here */
2031 snprintf(sb->s_id, sizeof(sb->s_id),
2032 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2033
2034 if (sb->s_blocksize == 0)
2035 sb->s_blocksize = nfs_block_bits(server->wsize,
2036 &sb->s_blocksize_bits);
2037
2038 sb->s_bdi = &server->backing_dev_info;
2039
2040 nfs_super_set_maxbytes(sb, server->maxfilesize);
2041}
2042
2043/*
2044 * Finish setting up an NFS2/3 superblock
2045 */
2046static void nfs_fill_super(struct super_block *sb,
2047 struct nfs_parsed_mount_data *data)
2048{
2049 struct nfs_server *server = NFS_SB(sb);
2050
2051 sb->s_blocksize_bits = 0;
2052 sb->s_blocksize = 0;
2053 if (data->bsize)
2054 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2055
2056 if (server->nfs_client->rpc_ops->version == 3) {
2057 /* The VFS shouldn't apply the umask to mode bits. We will do
2058 * so ourselves when necessary.
2059 */
2060 sb->s_flags |= MS_POSIXACL;
2061 sb->s_time_gran = 1;
2062 }
2063
2064 sb->s_op = &nfs_sops;
2065 nfs_initialise_sb(sb);
2066}
2067
2068/*
2069 * Finish setting up a cloned NFS2/3 superblock
2070 */
2071static void nfs_clone_super(struct super_block *sb,
2072 const struct super_block *old_sb)
2073{
2074 struct nfs_server *server = NFS_SB(sb);
2075
2076 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2077 sb->s_blocksize = old_sb->s_blocksize;
2078 sb->s_maxbytes = old_sb->s_maxbytes;
2079
2080 if (server->nfs_client->rpc_ops->version == 3) {
2081 /* The VFS shouldn't apply the umask to mode bits. We will do
2082 * so ourselves when necessary.
2083 */
2084 sb->s_flags |= MS_POSIXACL;
2085 sb->s_time_gran = 1;
2086 }
2087
2088 sb->s_op = old_sb->s_op;
2089 nfs_initialise_sb(sb);
2090}
2091
2092static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2093{
2094 const struct nfs_server *a = s->s_fs_info;
2095 const struct rpc_clnt *clnt_a = a->client;
2096 const struct rpc_clnt *clnt_b = b->client;
2097
2098 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2099 goto Ebusy;
2100 if (a->nfs_client != b->nfs_client)
2101 goto Ebusy;
2102 if (a->flags != b->flags)
2103 goto Ebusy;
2104 if (a->wsize != b->wsize)
2105 goto Ebusy;
2106 if (a->rsize != b->rsize)
2107 goto Ebusy;
2108 if (a->acregmin != b->acregmin)
2109 goto Ebusy;
2110 if (a->acregmax != b->acregmax)
2111 goto Ebusy;
2112 if (a->acdirmin != b->acdirmin)
2113 goto Ebusy;
2114 if (a->acdirmax != b->acdirmax)
2115 goto Ebusy;
2116 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2117 goto Ebusy;
2118 return 1;
2119Ebusy:
2120 return 0;
2121}
2122
2123struct nfs_sb_mountdata {
2124 struct nfs_server *server;
2125 int mntflags;
2126};
2127
2128static int nfs_set_super(struct super_block *s, void *data)
2129{
2130 struct nfs_sb_mountdata *sb_mntdata = data;
2131 struct nfs_server *server = sb_mntdata->server;
2132 int ret;
2133
2134 s->s_flags = sb_mntdata->mntflags;
2135 s->s_fs_info = server;
2136 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2137 ret = set_anon_super(s, server);
2138 if (ret == 0)
2139 server->s_dev = s->s_dev;
2140 return ret;
2141}
2142
2143static int nfs_compare_super_address(struct nfs_server *server1,
2144 struct nfs_server *server2)
2145{
2146 struct sockaddr *sap1, *sap2;
2147
2148 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2149 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2150
2151 if (sap1->sa_family != sap2->sa_family)
2152 return 0;
2153
2154 switch (sap1->sa_family) {
2155 case AF_INET: {
2156 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2157 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2158 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2159 return 0;
2160 if (sin1->sin_port != sin2->sin_port)
2161 return 0;
2162 break;
2163 }
2164 case AF_INET6: {
2165 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2166 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2167 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2168 return 0;
2169 if (sin1->sin6_port != sin2->sin6_port)
2170 return 0;
2171 break;
2172 }
2173 default:
2174 return 0;
2175 }
2176
2177 return 1;
2178}
2179
2180static int nfs_compare_super(struct super_block *sb, void *data)
2181{
2182 struct nfs_sb_mountdata *sb_mntdata = data;
2183 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2184 int mntflags = sb_mntdata->mntflags;
2185
2186 if (!nfs_compare_super_address(old, server))
2187 return 0;
2188 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2189 if (old->flags & NFS_MOUNT_UNSHARED)
2190 return 0;
2191 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2192 return 0;
2193 return nfs_compare_mount_options(sb, server, mntflags);
2194}
2195
2196static int nfs_bdi_register(struct nfs_server *server)
2197{
2198 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2199}
2200
2201static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2202 int flags, const char *dev_name, void *raw_data)
2203{
2204 struct nfs_server *server = NULL;
2205 struct super_block *s;
2206 struct nfs_parsed_mount_data *data;
2207 struct nfs_fh *mntfh;
2208 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2209 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2210 struct nfs_sb_mountdata sb_mntdata = {
2211 .mntflags = flags,
2212 };
2213 int error;
2214
2215 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2216 mntfh = nfs_alloc_fhandle();
2217 if (data == NULL || mntfh == NULL)
2218 goto out_free_fh;
2219
2220 security_init_mnt_opts(&data->lsm_opts);
2221
2222 /* Validate the mount data */
2223 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2224 if (error < 0) {
2225 mntroot = ERR_PTR(error);
2226 goto out;
2227 }
2228
2229#ifdef CONFIG_NFS_V4
2230 if (data->version == 4) {
2231 mntroot = nfs4_try_mount(flags, dev_name, data);
2232 kfree(data->client_address);
2233 kfree(data->nfs_server.export_path);
2234 goto out;
2235 }
2236#endif /* CONFIG_NFS_V4 */
2237
2238 /* Get a volume representation */
2239 server = nfs_create_server(data, mntfh);
2240 if (IS_ERR(server)) {
2241 mntroot = ERR_CAST(server);
2242 goto out;
2243 }
2244 sb_mntdata.server = server;
2245
2246 if (server->flags & NFS_MOUNT_UNSHARED)
2247 compare_super = NULL;
2248
2249 /* -o noac implies -o sync */
2250 if (server->flags & NFS_MOUNT_NOAC)
2251 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2252
2253 /* Get a superblock - note that we may end up sharing one that already exists */
2254 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2255 if (IS_ERR(s)) {
2256 mntroot = ERR_CAST(s);
2257 goto out_err_nosb;
2258 }
2259
2260 if (s->s_fs_info != server) {
2261 nfs_free_server(server);
2262 server = NULL;
2263 } else {
2264 error = nfs_bdi_register(server);
2265 if (error) {
2266 mntroot = ERR_PTR(error);
2267 goto error_splat_bdi;
2268 }
2269 }
2270
2271 if (!s->s_root) {
2272 /* initial superblock/root creation */
2273 nfs_fill_super(s, data);
2274 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2275 }
2276
2277 mntroot = nfs_get_root(s, mntfh, dev_name);
2278 if (IS_ERR(mntroot))
2279 goto error_splat_super;
2280
2281 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2282 if (error)
2283 goto error_splat_root;
2284
2285 s->s_flags |= MS_ACTIVE;
2286
2287out:
2288 kfree(data->nfs_server.hostname);
2289 kfree(data->mount_server.hostname);
2290 kfree(data->fscache_uniq);
2291 security_free_mnt_opts(&data->lsm_opts);
2292out_free_fh:
2293 nfs_free_fhandle(mntfh);
2294 kfree(data);
2295 return mntroot;
2296
2297out_err_nosb:
2298 nfs_free_server(server);
2299 goto out;
2300
2301error_splat_root:
2302 dput(mntroot);
2303 mntroot = ERR_PTR(error);
2304error_splat_super:
2305 if (server && !s->s_root)
2306 bdi_unregister(&server->backing_dev_info);
2307error_splat_bdi:
2308 deactivate_locked_super(s);
2309 goto out;
2310}
2311
2312/*
2313 * Ensure that we unregister the bdi before kill_anon_super
2314 * releases the device name
2315 */
2316static void nfs_put_super(struct super_block *s)
2317{
2318 struct nfs_server *server = NFS_SB(s);
2319
2320 bdi_unregister(&server->backing_dev_info);
2321}
2322
2323/*
2324 * Destroy an NFS2/3 superblock
2325 */
2326static void nfs_kill_super(struct super_block *s)
2327{
2328 struct nfs_server *server = NFS_SB(s);
2329
2330 kill_anon_super(s);
2331 nfs_fscache_release_super_cookie(s);
2332 nfs_free_server(server);
2333}
2334
2335/*
2336 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2337 */
2338static struct dentry *
2339nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2340 const char *dev_name, void *raw_data)
2341{
2342 struct nfs_clone_mount *data = raw_data;
2343 struct super_block *s;
2344 struct nfs_server *server;
2345 struct dentry *mntroot;
2346 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2347 struct nfs_sb_mountdata sb_mntdata = {
2348 .mntflags = flags,
2349 };
2350 int error;
2351
2352 dprintk("--> nfs_xdev_mount()\n");
2353
2354 /* create a new volume representation */
2355 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2356 if (IS_ERR(server)) {
2357 error = PTR_ERR(server);
2358 goto out_err_noserver;
2359 }
2360 sb_mntdata.server = server;
2361
2362 if (server->flags & NFS_MOUNT_UNSHARED)
2363 compare_super = NULL;
2364
2365 /* -o noac implies -o sync */
2366 if (server->flags & NFS_MOUNT_NOAC)
2367 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2368
2369 /* Get a superblock - note that we may end up sharing one that already exists */
2370 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2371 if (IS_ERR(s)) {
2372 error = PTR_ERR(s);
2373 goto out_err_nosb;
2374 }
2375
2376 if (s->s_fs_info != server) {
2377 nfs_free_server(server);
2378 server = NULL;
2379 } else {
2380 error = nfs_bdi_register(server);
2381 if (error)
2382 goto error_splat_bdi;
2383 }
2384
2385 if (!s->s_root) {
2386 /* initial superblock/root creation */
2387 nfs_clone_super(s, data->sb);
2388 nfs_fscache_get_super_cookie(s, NULL, data);
2389 }
2390
2391 mntroot = nfs_get_root(s, data->fh, dev_name);
2392 if (IS_ERR(mntroot)) {
2393 error = PTR_ERR(mntroot);
2394 goto error_splat_super;
2395 }
2396 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2397 dput(mntroot);
2398 error = -ESTALE;
2399 goto error_splat_super;
2400 }
2401
2402 s->s_flags |= MS_ACTIVE;
2403
2404 /* clone any lsm security options from the parent to the new sb */
2405 security_sb_clone_mnt_opts(data->sb, s);
2406
2407 dprintk("<-- nfs_xdev_mount() = 0\n");
2408 return mntroot;
2409
2410out_err_nosb:
2411 nfs_free_server(server);
2412out_err_noserver:
2413 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2414 return ERR_PTR(error);
2415
2416error_splat_super:
2417 if (server && !s->s_root)
2418 bdi_unregister(&server->backing_dev_info);
2419error_splat_bdi:
2420 deactivate_locked_super(s);
2421 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2422 return ERR_PTR(error);
2423}
2424
2425#ifdef CONFIG_NFS_V4
2426
2427/*
2428 * Finish setting up a cloned NFS4 superblock
2429 */
2430static void nfs4_clone_super(struct super_block *sb,
2431 const struct super_block *old_sb)
2432{
2433 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2434 sb->s_blocksize = old_sb->s_blocksize;
2435 sb->s_maxbytes = old_sb->s_maxbytes;
2436 sb->s_time_gran = 1;
2437 sb->s_op = old_sb->s_op;
2438 /*
2439 * The VFS shouldn't apply the umask to mode bits. We will do
2440 * so ourselves when necessary.
2441 */
2442 sb->s_flags |= MS_POSIXACL;
2443 sb->s_xattr = old_sb->s_xattr;
2444 nfs_initialise_sb(sb);
2445}
2446
2447/*
2448 * Set up an NFS4 superblock
2449 */
2450static void nfs4_fill_super(struct super_block *sb)
2451{
2452 sb->s_time_gran = 1;
2453 sb->s_op = &nfs4_sops;
2454 /*
2455 * The VFS shouldn't apply the umask to mode bits. We will do
2456 * so ourselves when necessary.
2457 */
2458 sb->s_flags |= MS_POSIXACL;
2459 sb->s_xattr = nfs4_xattr_handlers;
2460 nfs_initialise_sb(sb);
2461}
2462
2463static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2464{
2465 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2466 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2467}
2468
2469static int nfs4_validate_text_mount_data(void *options,
2470 struct nfs_parsed_mount_data *args,
2471 const char *dev_name)
2472{
2473 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2474
2475 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2476
2477 nfs_validate_transport_protocol(args);
2478
2479 nfs4_validate_mount_flags(args);
2480
2481 if (args->version != 4) {
2482 dfprintk(MOUNT,
2483 "NFS4: Illegal mount version\n");
2484 return -EINVAL;
2485 }
2486
2487 if (args->auth_flavor_len > 1) {
2488 dfprintk(MOUNT,
2489 "NFS4: Too many RPC auth flavours specified\n");
2490 return -EINVAL;
2491 }
2492
2493 if (args->client_address == NULL) {
2494 dfprintk(MOUNT,
2495 "NFS4: mount program didn't pass callback address\n");
2496 return -EINVAL;
2497 }
2498
2499 return nfs_parse_devname(dev_name,
2500 &args->nfs_server.hostname,
2501 NFS4_MAXNAMLEN,
2502 &args->nfs_server.export_path,
2503 NFS4_MAXPATHLEN);
2504}
2505
2506/*
2507 * Validate NFSv4 mount options
2508 */
2509static int nfs4_validate_mount_data(void *options,
2510 struct nfs_parsed_mount_data *args,
2511 const char *dev_name)
2512{
2513 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2514 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2515 char *c;
2516
2517 if (data == NULL)
2518 goto out_no_data;
2519
2520 switch (data->version) {
2521 case 1:
2522 if (data->host_addrlen > sizeof(args->nfs_server.address))
2523 goto out_no_address;
2524 if (data->host_addrlen == 0)
2525 goto out_no_address;
2526 args->nfs_server.addrlen = data->host_addrlen;
2527 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2528 return -EFAULT;
2529 if (!nfs_verify_server_address(sap))
2530 goto out_no_address;
2531
2532 if (data->auth_flavourlen) {
2533 if (data->auth_flavourlen > 1)
2534 goto out_inval_auth;
2535 if (copy_from_user(&args->auth_flavors[0],
2536 data->auth_flavours,
2537 sizeof(args->auth_flavors[0])))
2538 return -EFAULT;
2539 }
2540
2541 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2542 if (IS_ERR(c))
2543 return PTR_ERR(c);
2544 args->nfs_server.hostname = c;
2545
2546 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2547 if (IS_ERR(c))
2548 return PTR_ERR(c);
2549 args->nfs_server.export_path = c;
2550 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2551
2552 c = strndup_user(data->client_addr.data, 16);
2553 if (IS_ERR(c))
2554 return PTR_ERR(c);
2555 args->client_address = c;
2556
2557 /*
2558 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2559 * can deal with.
2560 */
2561
2562 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2563 args->rsize = data->rsize;
2564 args->wsize = data->wsize;
2565 args->timeo = data->timeo;
2566 args->retrans = data->retrans;
2567 args->acregmin = data->acregmin;
2568 args->acregmax = data->acregmax;
2569 args->acdirmin = data->acdirmin;
2570 args->acdirmax = data->acdirmax;
2571 args->nfs_server.protocol = data->proto;
2572 nfs_validate_transport_protocol(args);
2573
2574 break;
2575 default:
2576 if (nfs_parse_mount_options((char *)options, args) == 0)
2577 return -EINVAL;
2578
2579 if (!nfs_verify_server_address(sap))
2580 return -EINVAL;
2581
2582 return nfs4_validate_text_mount_data(options, args, dev_name);
2583 }
2584
2585 return 0;
2586
2587out_no_data:
2588 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2589 return -EINVAL;
2590
2591out_inval_auth:
2592 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2593 data->auth_flavourlen);
2594 return -EINVAL;
2595
2596out_no_address:
2597 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2598 return -EINVAL;
2599}
2600
2601/*
2602 * Get the superblock for the NFS4 root partition
2603 */
2604static struct dentry *
2605nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2606 const char *dev_name, void *raw_data)
2607{
2608 struct nfs_parsed_mount_data *data = raw_data;
2609 struct super_block *s;
2610 struct nfs_server *server;
2611 struct nfs_fh *mntfh;
2612 struct dentry *mntroot;
2613 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2614 struct nfs_sb_mountdata sb_mntdata = {
2615 .mntflags = flags,
2616 };
2617 int error = -ENOMEM;
2618
2619 mntfh = nfs_alloc_fhandle();
2620 if (data == NULL || mntfh == NULL)
2621 goto out_free_fh;
2622
2623 security_init_mnt_opts(&data->lsm_opts);
2624
2625 /* Get a volume representation */
2626 server = nfs4_create_server(data, mntfh);
2627 if (IS_ERR(server)) {
2628 error = PTR_ERR(server);
2629 goto out;
2630 }
2631 sb_mntdata.server = server;
2632
2633 if (server->flags & NFS4_MOUNT_UNSHARED)
2634 compare_super = NULL;
2635
2636 /* -o noac implies -o sync */
2637 if (server->flags & NFS_MOUNT_NOAC)
2638 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2639
2640 /* Get a superblock - note that we may end up sharing one that already exists */
2641 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2642 if (IS_ERR(s)) {
2643 error = PTR_ERR(s);
2644 goto out_free;
2645 }
2646
2647 if (s->s_fs_info != server) {
2648 nfs_free_server(server);
2649 server = NULL;
2650 } else {
2651 error = nfs_bdi_register(server);
2652 if (error)
2653 goto error_splat_bdi;
2654 }
2655
2656 if (!s->s_root) {
2657 /* initial superblock/root creation */
2658 nfs4_fill_super(s);
2659 nfs_fscache_get_super_cookie(
2660 s, data ? data->fscache_uniq : NULL, NULL);
2661 }
2662
2663 mntroot = nfs4_get_root(s, mntfh, dev_name);
2664 if (IS_ERR(mntroot)) {
2665 error = PTR_ERR(mntroot);
2666 goto error_splat_super;
2667 }
2668
2669 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2670 if (error)
2671 goto error_splat_root;
2672
2673 s->s_flags |= MS_ACTIVE;
2674
2675 security_free_mnt_opts(&data->lsm_opts);
2676 nfs_free_fhandle(mntfh);
2677 return mntroot;
2678
2679out:
2680 security_free_mnt_opts(&data->lsm_opts);
2681out_free_fh:
2682 nfs_free_fhandle(mntfh);
2683 return ERR_PTR(error);
2684
2685out_free:
2686 nfs_free_server(server);
2687 goto out;
2688
2689error_splat_root:
2690 dput(mntroot);
2691error_splat_super:
2692 if (server && !s->s_root)
2693 bdi_unregister(&server->backing_dev_info);
2694error_splat_bdi:
2695 deactivate_locked_super(s);
2696 goto out;
2697}
2698
2699static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2700 int flags, void *data, const char *hostname)
2701{
2702 struct vfsmount *root_mnt;
2703 char *root_devname;
2704 size_t len;
2705
2706 len = strlen(hostname) + 3;
2707 root_devname = kmalloc(len, GFP_KERNEL);
2708 if (root_devname == NULL)
2709 return ERR_PTR(-ENOMEM);
2710 snprintf(root_devname, len, "%s:/", hostname);
2711 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2712 kfree(root_devname);
2713 return root_mnt;
2714}
2715
2716struct nfs_referral_count {
2717 struct list_head list;
2718 const struct task_struct *task;
2719 unsigned int referral_count;
2720};
2721
2722static LIST_HEAD(nfs_referral_count_list);
2723static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2724
2725static struct nfs_referral_count *nfs_find_referral_count(void)
2726{
2727 struct nfs_referral_count *p;
2728
2729 list_for_each_entry(p, &nfs_referral_count_list, list) {
2730 if (p->task == current)
2731 return p;
2732 }
2733 return NULL;
2734}
2735
2736#define NFS_MAX_NESTED_REFERRALS 2
2737
2738static int nfs_referral_loop_protect(void)
2739{
2740 struct nfs_referral_count *p, *new;
2741 int ret = -ENOMEM;
2742
2743 new = kmalloc(sizeof(*new), GFP_KERNEL);
2744 if (!new)
2745 goto out;
2746 new->task = current;
2747 new->referral_count = 1;
2748
2749 ret = 0;
2750 spin_lock(&nfs_referral_count_list_lock);
2751 p = nfs_find_referral_count();
2752 if (p != NULL) {
2753 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2754 ret = -ELOOP;
2755 else
2756 p->referral_count++;
2757 } else {
2758 list_add(&new->list, &nfs_referral_count_list);
2759 new = NULL;
2760 }
2761 spin_unlock(&nfs_referral_count_list_lock);
2762 kfree(new);
2763out:
2764 return ret;
2765}
2766
2767static void nfs_referral_loop_unprotect(void)
2768{
2769 struct nfs_referral_count *p;
2770
2771 spin_lock(&nfs_referral_count_list_lock);
2772 p = nfs_find_referral_count();
2773 p->referral_count--;
2774 if (p->referral_count == 0)
2775 list_del(&p->list);
2776 else
2777 p = NULL;
2778 spin_unlock(&nfs_referral_count_list_lock);
2779 kfree(p);
2780}
2781
2782static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2783 const char *export_path)
2784{
2785 struct mnt_namespace *ns_private;
2786 struct super_block *s;
2787 struct dentry *dentry;
2788 struct path path;
2789 int ret;
2790
2791 ns_private = create_mnt_ns(root_mnt);
2792 ret = PTR_ERR(ns_private);
2793 if (IS_ERR(ns_private))
2794 goto out_mntput;
2795
2796 ret = nfs_referral_loop_protect();
2797 if (ret != 0)
2798 goto out_put_mnt_ns;
2799
2800 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2801 export_path, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
2802
2803 nfs_referral_loop_unprotect();
2804 put_mnt_ns(ns_private);
2805
2806 if (ret != 0)
2807 goto out_err;
2808
2809 s = path.mnt->mnt_sb;
2810 atomic_inc(&s->s_active);
2811 dentry = dget(path.dentry);
2812
2813 path_put(&path);
2814 down_write(&s->s_umount);
2815 return dentry;
2816out_put_mnt_ns:
2817 put_mnt_ns(ns_private);
2818out_mntput:
2819 mntput(root_mnt);
2820out_err:
2821 return ERR_PTR(ret);
2822}
2823
2824static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2825 struct nfs_parsed_mount_data *data)
2826{
2827 char *export_path;
2828 struct vfsmount *root_mnt;
2829 struct dentry *res;
2830
2831 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2832
2833 export_path = data->nfs_server.export_path;
2834 data->nfs_server.export_path = "/";
2835 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2836 data->nfs_server.hostname);
2837 data->nfs_server.export_path = export_path;
2838
2839 res = ERR_CAST(root_mnt);
2840 if (!IS_ERR(root_mnt))
2841 res = nfs_follow_remote_path(root_mnt, export_path);
2842
2843 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2844 IS_ERR(res) ? PTR_ERR(res) : 0,
2845 IS_ERR(res) ? " [error]" : "");
2846 return res;
2847}
2848
2849/*
2850 * Get the superblock for an NFS4 mountpoint
2851 */
2852static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2853 int flags, const char *dev_name, void *raw_data)
2854{
2855 struct nfs_parsed_mount_data *data;
2856 int error = -ENOMEM;
2857 struct dentry *res = ERR_PTR(-ENOMEM);
2858
2859 data = nfs_alloc_parsed_mount_data(4);
2860 if (data == NULL)
2861 goto out_free_data;
2862
2863 /* Validate the mount data */
2864 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2865 if (error < 0) {
2866 res = ERR_PTR(error);
2867 goto out;
2868 }
2869
2870 res = nfs4_try_mount(flags, dev_name, data);
2871 if (IS_ERR(res))
2872 error = PTR_ERR(res);
2873
2874out:
2875 kfree(data->client_address);
2876 kfree(data->nfs_server.export_path);
2877 kfree(data->nfs_server.hostname);
2878 kfree(data->fscache_uniq);
2879out_free_data:
2880 kfree(data);
2881 dprintk("<-- nfs4_mount() = %d%s\n", error,
2882 error != 0 ? " [error]" : "");
2883 return res;
2884}
2885
2886static void nfs4_kill_super(struct super_block *sb)
2887{
2888 struct nfs_server *server = NFS_SB(sb);
2889
2890 dprintk("--> %s\n", __func__);
2891 nfs_super_return_all_delegations(sb);
2892 kill_anon_super(sb);
2893 nfs_fscache_release_super_cookie(sb);
2894 nfs_free_server(server);
2895 dprintk("<-- %s\n", __func__);
2896}
2897
2898/*
2899 * Clone an NFS4 server record on xdev traversal (FSID-change)
2900 */
2901static struct dentry *
2902nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2903 const char *dev_name, void *raw_data)
2904{
2905 struct nfs_clone_mount *data = raw_data;
2906 struct super_block *s;
2907 struct nfs_server *server;
2908 struct dentry *mntroot;
2909 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2910 struct nfs_sb_mountdata sb_mntdata = {
2911 .mntflags = flags,
2912 };
2913 int error;
2914
2915 dprintk("--> nfs4_xdev_mount()\n");
2916
2917 /* create a new volume representation */
2918 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2919 if (IS_ERR(server)) {
2920 error = PTR_ERR(server);
2921 goto out_err_noserver;
2922 }
2923 sb_mntdata.server = server;
2924
2925 if (server->flags & NFS4_MOUNT_UNSHARED)
2926 compare_super = NULL;
2927
2928 /* -o noac implies -o sync */
2929 if (server->flags & NFS_MOUNT_NOAC)
2930 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2931
2932 /* Get a superblock - note that we may end up sharing one that already exists */
2933 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2934 if (IS_ERR(s)) {
2935 error = PTR_ERR(s);
2936 goto out_err_nosb;
2937 }
2938
2939 if (s->s_fs_info != server) {
2940 nfs_free_server(server);
2941 server = NULL;
2942 } else {
2943 error = nfs_bdi_register(server);
2944 if (error)
2945 goto error_splat_bdi;
2946 }
2947
2948 if (!s->s_root) {
2949 /* initial superblock/root creation */
2950 nfs4_clone_super(s, data->sb);
2951 nfs_fscache_get_super_cookie(s, NULL, data);
2952 }
2953
2954 mntroot = nfs4_get_root(s, data->fh, dev_name);
2955 if (IS_ERR(mntroot)) {
2956 error = PTR_ERR(mntroot);
2957 goto error_splat_super;
2958 }
2959 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2960 dput(mntroot);
2961 error = -ESTALE;
2962 goto error_splat_super;
2963 }
2964
2965 s->s_flags |= MS_ACTIVE;
2966
2967 security_sb_clone_mnt_opts(data->sb, s);
2968
2969 dprintk("<-- nfs4_xdev_mount() = 0\n");
2970 return mntroot;
2971
2972out_err_nosb:
2973 nfs_free_server(server);
2974out_err_noserver:
2975 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2976 return ERR_PTR(error);
2977
2978error_splat_super:
2979 if (server && !s->s_root)
2980 bdi_unregister(&server->backing_dev_info);
2981error_splat_bdi:
2982 deactivate_locked_super(s);
2983 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2984 return ERR_PTR(error);
2985}
2986
2987static struct dentry *
2988nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2989 const char *dev_name, void *raw_data)
2990{
2991 struct nfs_clone_mount *data = raw_data;
2992 struct super_block *s;
2993 struct nfs_server *server;
2994 struct dentry *mntroot;
2995 struct nfs_fh *mntfh;
2996 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2997 struct nfs_sb_mountdata sb_mntdata = {
2998 .mntflags = flags,
2999 };
3000 int error = -ENOMEM;
3001
3002 dprintk("--> nfs4_referral_get_sb()\n");
3003
3004 mntfh = nfs_alloc_fhandle();
3005 if (mntfh == NULL)
3006 goto out_err_nofh;
3007
3008 /* create a new volume representation */
3009 server = nfs4_create_referral_server(data, mntfh);
3010 if (IS_ERR(server)) {
3011 error = PTR_ERR(server);
3012 goto out_err_noserver;
3013 }
3014 sb_mntdata.server = server;
3015
3016 if (server->flags & NFS4_MOUNT_UNSHARED)
3017 compare_super = NULL;
3018
3019 /* -o noac implies -o sync */
3020 if (server->flags & NFS_MOUNT_NOAC)
3021 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3022
3023 /* Get a superblock - note that we may end up sharing one that already exists */
3024 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3025 if (IS_ERR(s)) {
3026 error = PTR_ERR(s);
3027 goto out_err_nosb;
3028 }
3029
3030 if (s->s_fs_info != server) {
3031 nfs_free_server(server);
3032 server = NULL;
3033 } else {
3034 error = nfs_bdi_register(server);
3035 if (error)
3036 goto error_splat_bdi;
3037 }
3038
3039 if (!s->s_root) {
3040 /* initial superblock/root creation */
3041 nfs4_fill_super(s);
3042 nfs_fscache_get_super_cookie(s, NULL, data);
3043 }
3044
3045 mntroot = nfs4_get_root(s, mntfh, dev_name);
3046 if (IS_ERR(mntroot)) {
3047 error = PTR_ERR(mntroot);
3048 goto error_splat_super;
3049 }
3050 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3051 dput(mntroot);
3052 error = -ESTALE;
3053 goto error_splat_super;
3054 }
3055
3056 s->s_flags |= MS_ACTIVE;
3057
3058 security_sb_clone_mnt_opts(data->sb, s);
3059
3060 nfs_free_fhandle(mntfh);
3061 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3062 return mntroot;
3063
3064out_err_nosb:
3065 nfs_free_server(server);
3066out_err_noserver:
3067 nfs_free_fhandle(mntfh);
3068out_err_nofh:
3069 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3070 return ERR_PTR(error);
3071
3072error_splat_super:
3073 if (server && !s->s_root)
3074 bdi_unregister(&server->backing_dev_info);
3075error_splat_bdi:
3076 deactivate_locked_super(s);
3077 nfs_free_fhandle(mntfh);
3078 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3079 return ERR_PTR(error);
3080}
3081
3082/*
3083 * Create an NFS4 server record on referral traversal
3084 */
3085static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3086 int flags, const char *dev_name, void *raw_data)
3087{
3088 struct nfs_clone_mount *data = raw_data;
3089 char *export_path;
3090 struct vfsmount *root_mnt;
3091 struct dentry *res;
3092
3093 dprintk("--> nfs4_referral_mount()\n");
3094
3095 export_path = data->mnt_path;
3096 data->mnt_path = "/";
3097
3098 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3099 flags, data, data->hostname);
3100 data->mnt_path = export_path;
3101
3102 res = ERR_CAST(root_mnt);
3103 if (!IS_ERR(root_mnt))
3104 res = nfs_follow_remote_path(root_mnt, export_path);
3105 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3106 IS_ERR(res) ? PTR_ERR(res) : 0,
3107 IS_ERR(res) ? " [error]" : "");
3108 return res;
3109}
3110
3111#endif /* CONFIG_NFS_V4 */