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NFS: Consolidate the parsing of the '-ov4.x' and '-overs=4.x' mount options
[mirror_ubuntu-zesty-kernel.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56
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
76 enum {
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_udp, Opt_tcp, Opt_rdma,
84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
86 Opt_sharecache, Opt_nosharecache,
87 Opt_resvport, Opt_noresvport,
88 Opt_fscache, Opt_nofscache,
89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
99 Opt_mountvers,
100 Opt_minorversion,
101
102 /* Mount options that take string arguments */
103 Opt_nfsvers,
104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
106 Opt_lookupcache,
107 Opt_fscache_uniq,
108 Opt_local_lock,
109
110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
112
113 Opt_err
114 };
115
116 static const match_table_t nfs_mount_option_tokens = {
117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
119 { Opt_userspace, "retry=%s" },
120
121 { Opt_sloppy, "sloppy" },
122
123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
135 { Opt_udp, "udp" },
136 { Opt_tcp, "tcp" },
137 { Opt_rdma, "rdma" },
138 { Opt_acl, "acl" },
139 { Opt_noacl, "noacl" },
140 { Opt_rdirplus, "rdirplus" },
141 { Opt_nordirplus, "nordirplus" },
142 { Opt_sharecache, "sharecache" },
143 { Opt_nosharecache, "nosharecache" },
144 { Opt_resvport, "resvport" },
145 { Opt_noresvport, "noresvport" },
146 { Opt_fscache, "fsc" },
147 { Opt_nofscache, "nofsc" },
148
149 { Opt_port, "port=%s" },
150 { Opt_rsize, "rsize=%s" },
151 { Opt_wsize, "wsize=%s" },
152 { Opt_bsize, "bsize=%s" },
153 { Opt_timeo, "timeo=%s" },
154 { Opt_retrans, "retrans=%s" },
155 { Opt_acregmin, "acregmin=%s" },
156 { Opt_acregmax, "acregmax=%s" },
157 { Opt_acdirmin, "acdirmin=%s" },
158 { Opt_acdirmax, "acdirmax=%s" },
159 { Opt_actimeo, "actimeo=%s" },
160 { Opt_namelen, "namlen=%s" },
161 { Opt_mountport, "mountport=%s" },
162 { Opt_mountvers, "mountvers=%s" },
163 { Opt_minorversion, "minorversion=%s" },
164
165 { Opt_nfsvers, "nfsvers=%s" },
166 { Opt_nfsvers, "vers=%s" },
167
168 { Opt_sec, "sec=%s" },
169 { Opt_proto, "proto=%s" },
170 { Opt_mountproto, "mountproto=%s" },
171 { Opt_addr, "addr=%s" },
172 { Opt_clientaddr, "clientaddr=%s" },
173 { Opt_mounthost, "mounthost=%s" },
174 { Opt_mountaddr, "mountaddr=%s" },
175
176 { Opt_lookupcache, "lookupcache=%s" },
177 { Opt_fscache_uniq, "fsc=%s" },
178 { Opt_local_lock, "local_lock=%s" },
179
180 /* The following needs to be listed after all other options */
181 { Opt_nfsvers, "v%s" },
182
183 { Opt_err, NULL }
184 };
185
186 enum {
187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
188
189 Opt_xprt_err
190 };
191
192 static 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
202 enum {
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
211 static 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
231 enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236 };
237
238 static 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
247 enum {
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
254 static 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 enum {
264 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
265 Opt_vers_4_1,
266
267 Opt_vers_err
268 };
269
270 static match_table_t nfs_vers_tokens = {
271 { Opt_vers_2, "2" },
272 { Opt_vers_3, "3" },
273 { Opt_vers_4, "4" },
274 { Opt_vers_4_0, "4.0" },
275 { Opt_vers_4_1, "4.1" },
276
277 { Opt_vers_err, NULL }
278 };
279
280 static void nfs_umount_begin(struct super_block *);
281 static int nfs_statfs(struct dentry *, struct kstatfs *);
282 static int nfs_show_options(struct seq_file *, struct dentry *);
283 static int nfs_show_devname(struct seq_file *, struct dentry *);
284 static int nfs_show_path(struct seq_file *, struct dentry *);
285 static int nfs_show_stats(struct seq_file *, struct dentry *);
286 static struct dentry *nfs_fs_mount(struct file_system_type *,
287 int, const char *, void *);
288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
290 static void nfs_put_super(struct super_block *);
291 static void nfs_kill_super(struct super_block *);
292 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
293
294 static struct file_system_type nfs_fs_type = {
295 .owner = THIS_MODULE,
296 .name = "nfs",
297 .mount = nfs_fs_mount,
298 .kill_sb = nfs_kill_super,
299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
300 };
301
302 struct 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_REVAL_DOT|FS_BINARY_MOUNTDATA,
308 };
309
310 static const struct super_operations nfs_sops = {
311 .alloc_inode = nfs_alloc_inode,
312 .destroy_inode = nfs_destroy_inode,
313 .write_inode = nfs_write_inode,
314 .put_super = nfs_put_super,
315 .statfs = nfs_statfs,
316 .evict_inode = nfs_evict_inode,
317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
321 .show_stats = nfs_show_stats,
322 .remount_fs = nfs_remount,
323 };
324
325 #ifdef CONFIG_NFS_V4
326 static int nfs4_validate_text_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
328 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
329 struct nfs_parsed_mount_data *data);
330 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
331 int flags, const char *dev_name, void *raw_data);
332 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
333 int flags, const char *dev_name, void *raw_data);
334 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
335 int flags, const char *dev_name, void *raw_data);
336 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
337 int flags, const char *dev_name, void *raw_data);
338 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
339 int flags, const char *dev_name, void *raw_data);
340 static void nfs4_kill_super(struct super_block *sb);
341
342 static struct file_system_type nfs4_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348 };
349
350 static struct file_system_type nfs4_remote_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356 };
357
358 struct file_system_type nfs4_xdev_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_xdev_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364 };
365
366 static struct file_system_type nfs4_remote_referral_fs_type = {
367 .owner = THIS_MODULE,
368 .name = "nfs4",
369 .mount = nfs4_remote_referral_mount,
370 .kill_sb = nfs4_kill_super,
371 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
372 };
373
374 struct file_system_type nfs4_referral_fs_type = {
375 .owner = THIS_MODULE,
376 .name = "nfs4",
377 .mount = nfs4_referral_mount,
378 .kill_sb = nfs4_kill_super,
379 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
380 };
381
382 static const struct super_operations nfs4_sops = {
383 .alloc_inode = nfs_alloc_inode,
384 .destroy_inode = nfs_destroy_inode,
385 .write_inode = nfs_write_inode,
386 .put_super = nfs_put_super,
387 .statfs = nfs_statfs,
388 .evict_inode = nfs4_evict_inode,
389 .umount_begin = nfs_umount_begin,
390 .show_options = nfs_show_options,
391 .show_devname = nfs_show_devname,
392 .show_path = nfs_show_path,
393 .show_stats = nfs_show_stats,
394 .remount_fs = nfs_remount,
395 };
396 #endif
397
398 static struct shrinker acl_shrinker = {
399 .shrink = nfs_access_cache_shrinker,
400 .seeks = DEFAULT_SEEKS,
401 };
402
403 /*
404 * Register the NFS filesystems
405 */
406 int __init register_nfs_fs(void)
407 {
408 int ret;
409
410 ret = register_filesystem(&nfs_fs_type);
411 if (ret < 0)
412 goto error_0;
413
414 ret = nfs_register_sysctl();
415 if (ret < 0)
416 goto error_1;
417 #ifdef CONFIG_NFS_V4
418 ret = register_filesystem(&nfs4_fs_type);
419 if (ret < 0)
420 goto error_2;
421 #endif
422 register_shrinker(&acl_shrinker);
423 return 0;
424
425 #ifdef CONFIG_NFS_V4
426 error_2:
427 nfs_unregister_sysctl();
428 #endif
429 error_1:
430 unregister_filesystem(&nfs_fs_type);
431 error_0:
432 return ret;
433 }
434
435 /*
436 * Unregister the NFS filesystems
437 */
438 void __exit unregister_nfs_fs(void)
439 {
440 unregister_shrinker(&acl_shrinker);
441 #ifdef CONFIG_NFS_V4
442 unregister_filesystem(&nfs4_fs_type);
443 #endif
444 nfs_unregister_sysctl();
445 unregister_filesystem(&nfs_fs_type);
446 }
447
448 void nfs_sb_active(struct super_block *sb)
449 {
450 struct nfs_server *server = NFS_SB(sb);
451
452 if (atomic_inc_return(&server->active) == 1)
453 atomic_inc(&sb->s_active);
454 }
455
456 void nfs_sb_deactive(struct super_block *sb)
457 {
458 struct nfs_server *server = NFS_SB(sb);
459
460 if (atomic_dec_and_test(&server->active))
461 deactivate_super(sb);
462 }
463
464 /*
465 * Deliver file system statistics to userspace
466 */
467 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
468 {
469 struct nfs_server *server = NFS_SB(dentry->d_sb);
470 unsigned char blockbits;
471 unsigned long blockres;
472 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
473 struct nfs_fsstat res;
474 int error = -ENOMEM;
475
476 res.fattr = nfs_alloc_fattr();
477 if (res.fattr == NULL)
478 goto out_err;
479
480 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
481 if (unlikely(error == -ESTALE)) {
482 struct dentry *pd_dentry;
483
484 pd_dentry = dget_parent(dentry);
485 if (pd_dentry != NULL) {
486 nfs_zap_caches(pd_dentry->d_inode);
487 dput(pd_dentry);
488 }
489 }
490 nfs_free_fattr(res.fattr);
491 if (error < 0)
492 goto out_err;
493
494 buf->f_type = NFS_SUPER_MAGIC;
495
496 /*
497 * Current versions of glibc do not correctly handle the
498 * case where f_frsize != f_bsize. Eventually we want to
499 * report the value of wtmult in this field.
500 */
501 buf->f_frsize = dentry->d_sb->s_blocksize;
502
503 /*
504 * On most *nix systems, f_blocks, f_bfree, and f_bavail
505 * are reported in units of f_frsize. Linux hasn't had
506 * an f_frsize field in its statfs struct until recently,
507 * thus historically Linux's sys_statfs reports these
508 * fields in units of f_bsize.
509 */
510 buf->f_bsize = dentry->d_sb->s_blocksize;
511 blockbits = dentry->d_sb->s_blocksize_bits;
512 blockres = (1 << blockbits) - 1;
513 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
514 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
515 buf->f_bavail = (res.abytes + blockres) >> blockbits;
516
517 buf->f_files = res.tfiles;
518 buf->f_ffree = res.afiles;
519
520 buf->f_namelen = server->namelen;
521
522 return 0;
523
524 out_err:
525 dprintk("%s: statfs error = %d\n", __func__, -error);
526 return error;
527 }
528
529 /*
530 * Map the security flavour number to a name
531 */
532 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
533 {
534 static const struct {
535 rpc_authflavor_t flavour;
536 const char *str;
537 } sec_flavours[] = {
538 { RPC_AUTH_NULL, "null" },
539 { RPC_AUTH_UNIX, "sys" },
540 { RPC_AUTH_GSS_KRB5, "krb5" },
541 { RPC_AUTH_GSS_KRB5I, "krb5i" },
542 { RPC_AUTH_GSS_KRB5P, "krb5p" },
543 { RPC_AUTH_GSS_LKEY, "lkey" },
544 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
545 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
546 { RPC_AUTH_GSS_SPKM, "spkm" },
547 { RPC_AUTH_GSS_SPKMI, "spkmi" },
548 { RPC_AUTH_GSS_SPKMP, "spkmp" },
549 { UINT_MAX, "unknown" }
550 };
551 int i;
552
553 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
554 if (sec_flavours[i].flavour == flavour)
555 break;
556 }
557 return sec_flavours[i].str;
558 }
559
560 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
561 int showdefaults)
562 {
563 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
564
565 seq_printf(m, ",mountproto=");
566 switch (sap->sa_family) {
567 case AF_INET:
568 switch (nfss->mountd_protocol) {
569 case IPPROTO_UDP:
570 seq_printf(m, RPCBIND_NETID_UDP);
571 break;
572 case IPPROTO_TCP:
573 seq_printf(m, RPCBIND_NETID_TCP);
574 break;
575 default:
576 if (showdefaults)
577 seq_printf(m, "auto");
578 }
579 break;
580 case AF_INET6:
581 switch (nfss->mountd_protocol) {
582 case IPPROTO_UDP:
583 seq_printf(m, RPCBIND_NETID_UDP6);
584 break;
585 case IPPROTO_TCP:
586 seq_printf(m, RPCBIND_NETID_TCP6);
587 break;
588 default:
589 if (showdefaults)
590 seq_printf(m, "auto");
591 }
592 break;
593 default:
594 if (showdefaults)
595 seq_printf(m, "auto");
596 }
597 }
598
599 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
600 int showdefaults)
601 {
602 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
603
604 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
605 return;
606
607 switch (sap->sa_family) {
608 case AF_INET: {
609 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
610 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
611 break;
612 }
613 case AF_INET6: {
614 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
615 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
616 break;
617 }
618 default:
619 if (showdefaults)
620 seq_printf(m, ",mountaddr=unspecified");
621 }
622
623 if (nfss->mountd_version || showdefaults)
624 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
625 if ((nfss->mountd_port &&
626 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
627 showdefaults)
628 seq_printf(m, ",mountport=%u", nfss->mountd_port);
629
630 nfs_show_mountd_netid(m, nfss, showdefaults);
631 }
632
633 #ifdef CONFIG_NFS_V4
634 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
635 int showdefaults)
636 {
637 struct nfs_client *clp = nfss->nfs_client;
638
639 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
640 }
641 #else
642 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
643 int showdefaults)
644 {
645 }
646 #endif
647
648 static void nfs_show_nfs_version(struct seq_file *m,
649 unsigned int version,
650 unsigned int minorversion)
651 {
652 seq_printf(m, ",vers=%u", version);
653 if (version == 4)
654 seq_printf(m, ".%u", minorversion);
655 }
656
657 /*
658 * Describe the mount options in force on this server representation
659 */
660 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
661 int showdefaults)
662 {
663 static const struct proc_nfs_info {
664 int flag;
665 const char *str;
666 const char *nostr;
667 } nfs_info[] = {
668 { NFS_MOUNT_SOFT, ",soft", ",hard" },
669 { NFS_MOUNT_POSIX, ",posix", "" },
670 { NFS_MOUNT_NOCTO, ",nocto", "" },
671 { NFS_MOUNT_NOAC, ",noac", "" },
672 { NFS_MOUNT_NONLM, ",nolock", "" },
673 { NFS_MOUNT_NOACL, ",noacl", "" },
674 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
675 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
676 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
677 { 0, NULL, NULL }
678 };
679 const struct proc_nfs_info *nfs_infop;
680 struct nfs_client *clp = nfss->nfs_client;
681 u32 version = clp->rpc_ops->version;
682 int local_flock, local_fcntl;
683
684 nfs_show_nfs_version(m, version, clp->cl_minorversion);
685 seq_printf(m, ",rsize=%u", nfss->rsize);
686 seq_printf(m, ",wsize=%u", nfss->wsize);
687 if (nfss->bsize != 0)
688 seq_printf(m, ",bsize=%u", nfss->bsize);
689 seq_printf(m, ",namlen=%u", nfss->namelen);
690 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
691 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
692 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
693 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
694 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
695 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
696 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
697 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
698 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
699 if (nfss->flags & nfs_infop->flag)
700 seq_puts(m, nfs_infop->str);
701 else
702 seq_puts(m, nfs_infop->nostr);
703 }
704 seq_printf(m, ",proto=%s",
705 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
706 if (version == 4) {
707 if (nfss->port != NFS_PORT)
708 seq_printf(m, ",port=%u", nfss->port);
709 } else
710 if (nfss->port)
711 seq_printf(m, ",port=%u", nfss->port);
712
713 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
714 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
715 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
716
717 if (version != 4)
718 nfs_show_mountd_options(m, nfss, showdefaults);
719 else
720 nfs_show_nfsv4_options(m, nfss, showdefaults);
721
722 if (nfss->options & NFS_OPTION_FSCACHE)
723 seq_printf(m, ",fsc");
724
725 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
726 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
727 seq_printf(m, ",lookupcache=none");
728 else
729 seq_printf(m, ",lookupcache=pos");
730 }
731
732 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
733 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
734
735 if (!local_flock && !local_fcntl)
736 seq_printf(m, ",local_lock=none");
737 else if (local_flock && local_fcntl)
738 seq_printf(m, ",local_lock=all");
739 else if (local_flock)
740 seq_printf(m, ",local_lock=flock");
741 else
742 seq_printf(m, ",local_lock=posix");
743 }
744
745 /*
746 * Describe the mount options on this VFS mountpoint
747 */
748 static int nfs_show_options(struct seq_file *m, struct dentry *root)
749 {
750 struct nfs_server *nfss = NFS_SB(root->d_sb);
751
752 nfs_show_mount_options(m, nfss, 0);
753
754 seq_printf(m, ",addr=%s",
755 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
756 RPC_DISPLAY_ADDR));
757
758 return 0;
759 }
760
761 #ifdef CONFIG_NFS_V4
762 #ifdef CONFIG_NFS_V4_1
763 static void show_sessions(struct seq_file *m, struct nfs_server *server)
764 {
765 if (nfs4_has_session(server->nfs_client))
766 seq_printf(m, ",sessions");
767 }
768 #else
769 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
770 #endif
771 #endif
772
773 #ifdef CONFIG_NFS_V4
774 #ifdef CONFIG_NFS_V4_1
775 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
776 {
777 seq_printf(m, ",pnfs=");
778 if (server->pnfs_curr_ld)
779 seq_printf(m, "%s", server->pnfs_curr_ld->name);
780 else
781 seq_printf(m, "not configured");
782 }
783 #else
784 static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
785 #endif
786 #endif
787
788 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
789 {
790 char *page = (char *) __get_free_page(GFP_KERNEL);
791 char *devname, *dummy;
792 int err = 0;
793 if (!page)
794 return -ENOMEM;
795 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
796 if (IS_ERR(devname))
797 err = PTR_ERR(devname);
798 else
799 seq_escape(m, devname, " \t\n\\");
800 free_page((unsigned long)page);
801 return err;
802 }
803
804 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
805 {
806 seq_puts(m, "/");
807 return 0;
808 }
809
810 /*
811 * Present statistical information for this VFS mountpoint
812 */
813 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
814 {
815 int i, cpu;
816 struct nfs_server *nfss = NFS_SB(root->d_sb);
817 struct rpc_auth *auth = nfss->client->cl_auth;
818 struct nfs_iostats totals = { };
819
820 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
821
822 /*
823 * Display all mount option settings
824 */
825 seq_printf(m, "\n\topts:\t");
826 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
827 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
828 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
829 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
830 nfs_show_mount_options(m, nfss, 1);
831
832 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
833
834 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
835 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
836 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
837 "date='%llu,%u'",
838 impl_id->name, impl_id->domain,
839 impl_id->date.seconds, impl_id->date.nseconds);
840 }
841
842 seq_printf(m, "\n\tcaps:\t");
843 seq_printf(m, "caps=0x%x", nfss->caps);
844 seq_printf(m, ",wtmult=%u", nfss->wtmult);
845 seq_printf(m, ",dtsize=%u", nfss->dtsize);
846 seq_printf(m, ",bsize=%u", nfss->bsize);
847 seq_printf(m, ",namlen=%u", nfss->namelen);
848
849 #ifdef CONFIG_NFS_V4
850 if (nfss->nfs_client->rpc_ops->version == 4) {
851 seq_printf(m, "\n\tnfsv4:\t");
852 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
853 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
854 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
855 show_sessions(m, nfss);
856 show_pnfs(m, nfss);
857 }
858 #endif
859
860 /*
861 * Display security flavor in effect for this mount
862 */
863 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
864 if (auth->au_flavor)
865 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
866
867 /*
868 * Display superblock I/O counters
869 */
870 for_each_possible_cpu(cpu) {
871 struct nfs_iostats *stats;
872
873 preempt_disable();
874 stats = per_cpu_ptr(nfss->io_stats, cpu);
875
876 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
877 totals.events[i] += stats->events[i];
878 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
879 totals.bytes[i] += stats->bytes[i];
880 #ifdef CONFIG_NFS_FSCACHE
881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
882 totals.fscache[i] += stats->fscache[i];
883 #endif
884
885 preempt_enable();
886 }
887
888 seq_printf(m, "\n\tevents:\t");
889 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
890 seq_printf(m, "%lu ", totals.events[i]);
891 seq_printf(m, "\n\tbytes:\t");
892 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
893 seq_printf(m, "%Lu ", totals.bytes[i]);
894 #ifdef CONFIG_NFS_FSCACHE
895 if (nfss->options & NFS_OPTION_FSCACHE) {
896 seq_printf(m, "\n\tfsc:\t");
897 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
898 seq_printf(m, "%Lu ", totals.bytes[i]);
899 }
900 #endif
901 seq_printf(m, "\n");
902
903 rpc_print_iostats(m, nfss->client);
904
905 return 0;
906 }
907
908 /*
909 * Begin unmount by attempting to remove all automounted mountpoints we added
910 * in response to xdev traversals and referrals
911 */
912 static void nfs_umount_begin(struct super_block *sb)
913 {
914 struct nfs_server *server;
915 struct rpc_clnt *rpc;
916
917 server = NFS_SB(sb);
918 /* -EIO all pending I/O */
919 rpc = server->client_acl;
920 if (!IS_ERR(rpc))
921 rpc_killall_tasks(rpc);
922 rpc = server->client;
923 if (!IS_ERR(rpc))
924 rpc_killall_tasks(rpc);
925 }
926
927 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
928 {
929 struct nfs_parsed_mount_data *data;
930
931 data = kzalloc(sizeof(*data), GFP_KERNEL);
932 if (data) {
933 data->acregmin = NFS_DEF_ACREGMIN;
934 data->acregmax = NFS_DEF_ACREGMAX;
935 data->acdirmin = NFS_DEF_ACDIRMIN;
936 data->acdirmax = NFS_DEF_ACDIRMAX;
937 data->mount_server.port = NFS_UNSPEC_PORT;
938 data->nfs_server.port = NFS_UNSPEC_PORT;
939 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
940 data->auth_flavors[0] = RPC_AUTH_UNIX;
941 data->auth_flavor_len = 1;
942 data->version = version;
943 data->minorversion = 0;
944 data->net = current->nsproxy->net_ns;
945 security_init_mnt_opts(&data->lsm_opts);
946 }
947 return data;
948 }
949
950 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
951 {
952 if (data) {
953 kfree(data->client_address);
954 kfree(data->mount_server.hostname);
955 kfree(data->nfs_server.export_path);
956 kfree(data->nfs_server.hostname);
957 kfree(data->fscache_uniq);
958 security_free_mnt_opts(&data->lsm_opts);
959 kfree(data);
960 }
961 }
962
963 /*
964 * Sanity-check a server address provided by the mount command.
965 *
966 * Address family must be initialized, and address must not be
967 * the ANY address for that family.
968 */
969 static int nfs_verify_server_address(struct sockaddr *addr)
970 {
971 switch (addr->sa_family) {
972 case AF_INET: {
973 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
974 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
975 }
976 case AF_INET6: {
977 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
978 return !ipv6_addr_any(sa);
979 }
980 }
981
982 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
983 return 0;
984 }
985
986 /*
987 * Select between a default port value and a user-specified port value.
988 * If a zero value is set, then autobind will be used.
989 */
990 static void nfs_set_port(struct sockaddr *sap, int *port,
991 const unsigned short default_port)
992 {
993 if (*port == NFS_UNSPEC_PORT)
994 *port = default_port;
995
996 rpc_set_port(sap, *port);
997 }
998
999 /*
1000 * Sanity check the NFS transport protocol.
1001 *
1002 */
1003 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1004 {
1005 switch (mnt->nfs_server.protocol) {
1006 case XPRT_TRANSPORT_UDP:
1007 case XPRT_TRANSPORT_TCP:
1008 case XPRT_TRANSPORT_RDMA:
1009 break;
1010 default:
1011 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1012 }
1013 }
1014
1015 /*
1016 * For text based NFSv2/v3 mounts, the mount protocol transport default
1017 * settings should depend upon the specified NFS transport.
1018 */
1019 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1020 {
1021 nfs_validate_transport_protocol(mnt);
1022
1023 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1024 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1025 return;
1026 switch (mnt->nfs_server.protocol) {
1027 case XPRT_TRANSPORT_UDP:
1028 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1029 break;
1030 case XPRT_TRANSPORT_TCP:
1031 case XPRT_TRANSPORT_RDMA:
1032 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1033 }
1034 }
1035
1036 /*
1037 * Parse the value of the 'sec=' option.
1038 */
1039 static int nfs_parse_security_flavors(char *value,
1040 struct nfs_parsed_mount_data *mnt)
1041 {
1042 substring_t args[MAX_OPT_ARGS];
1043
1044 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1045
1046 switch (match_token(value, nfs_secflavor_tokens, args)) {
1047 case Opt_sec_none:
1048 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1049 break;
1050 case Opt_sec_sys:
1051 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1052 break;
1053 case Opt_sec_krb5:
1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1055 break;
1056 case Opt_sec_krb5i:
1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1058 break;
1059 case Opt_sec_krb5p:
1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1061 break;
1062 case Opt_sec_lkey:
1063 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1064 break;
1065 case Opt_sec_lkeyi:
1066 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1067 break;
1068 case Opt_sec_lkeyp:
1069 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1070 break;
1071 case Opt_sec_spkm:
1072 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1073 break;
1074 case Opt_sec_spkmi:
1075 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1076 break;
1077 case Opt_sec_spkmp:
1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1079 break;
1080 default:
1081 return 0;
1082 }
1083
1084 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1085 mnt->auth_flavor_len = 1;
1086 return 1;
1087 }
1088
1089 static int nfs_parse_version_string(char *string,
1090 struct nfs_parsed_mount_data *mnt,
1091 substring_t *args)
1092 {
1093 mnt->flags &= ~NFS_MOUNT_VER3;
1094 switch (match_token(string, nfs_vers_tokens, args)) {
1095 case Opt_vers_2:
1096 mnt->version = 2;
1097 break;
1098 case Opt_vers_3:
1099 mnt->flags |= NFS_MOUNT_VER3;
1100 mnt->version = 3;
1101 break;
1102 case Opt_vers_4:
1103 /* Backward compatibility option. In future,
1104 * the mount program should always supply
1105 * a NFSv4 minor version number.
1106 */
1107 mnt->version = 4;
1108 break;
1109 case Opt_vers_4_0:
1110 mnt->version = 4;
1111 mnt->minorversion = 0;
1112 break;
1113 case Opt_vers_4_1:
1114 mnt->version = 4;
1115 mnt->minorversion = 1;
1116 break;
1117 default:
1118 return 0;
1119 }
1120 return 1;
1121 }
1122
1123 static int nfs_get_option_str(substring_t args[], char **option)
1124 {
1125 kfree(*option);
1126 *option = match_strdup(args);
1127 return !option;
1128 }
1129
1130 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1131 {
1132 int rc;
1133 char *string;
1134
1135 string = match_strdup(args);
1136 if (string == NULL)
1137 return -ENOMEM;
1138 rc = strict_strtoul(string, 10, option);
1139 kfree(string);
1140
1141 return rc;
1142 }
1143
1144 /*
1145 * Error-check and convert a string of mount options from user space into
1146 * a data structure. The whole mount string is processed; bad options are
1147 * skipped as they are encountered. If there were no errors, return 1;
1148 * otherwise return 0 (zero).
1149 */
1150 static int nfs_parse_mount_options(char *raw,
1151 struct nfs_parsed_mount_data *mnt)
1152 {
1153 char *p, *string, *secdata;
1154 int rc, sloppy = 0, invalid_option = 0;
1155 unsigned short protofamily = AF_UNSPEC;
1156 unsigned short mountfamily = AF_UNSPEC;
1157
1158 if (!raw) {
1159 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1160 return 1;
1161 }
1162 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1163
1164 secdata = alloc_secdata();
1165 if (!secdata)
1166 goto out_nomem;
1167
1168 rc = security_sb_copy_data(raw, secdata);
1169 if (rc)
1170 goto out_security_failure;
1171
1172 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1173 if (rc)
1174 goto out_security_failure;
1175
1176 free_secdata(secdata);
1177
1178 while ((p = strsep(&raw, ",")) != NULL) {
1179 substring_t args[MAX_OPT_ARGS];
1180 unsigned long option;
1181 int token;
1182
1183 if (!*p)
1184 continue;
1185
1186 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1187
1188 token = match_token(p, nfs_mount_option_tokens, args);
1189 switch (token) {
1190
1191 /*
1192 * boolean options: foo/nofoo
1193 */
1194 case Opt_soft:
1195 mnt->flags |= NFS_MOUNT_SOFT;
1196 break;
1197 case Opt_hard:
1198 mnt->flags &= ~NFS_MOUNT_SOFT;
1199 break;
1200 case Opt_posix:
1201 mnt->flags |= NFS_MOUNT_POSIX;
1202 break;
1203 case Opt_noposix:
1204 mnt->flags &= ~NFS_MOUNT_POSIX;
1205 break;
1206 case Opt_cto:
1207 mnt->flags &= ~NFS_MOUNT_NOCTO;
1208 break;
1209 case Opt_nocto:
1210 mnt->flags |= NFS_MOUNT_NOCTO;
1211 break;
1212 case Opt_ac:
1213 mnt->flags &= ~NFS_MOUNT_NOAC;
1214 break;
1215 case Opt_noac:
1216 mnt->flags |= NFS_MOUNT_NOAC;
1217 break;
1218 case Opt_lock:
1219 mnt->flags &= ~NFS_MOUNT_NONLM;
1220 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1221 NFS_MOUNT_LOCAL_FCNTL);
1222 break;
1223 case Opt_nolock:
1224 mnt->flags |= NFS_MOUNT_NONLM;
1225 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1226 NFS_MOUNT_LOCAL_FCNTL);
1227 break;
1228 case Opt_udp:
1229 mnt->flags &= ~NFS_MOUNT_TCP;
1230 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1231 break;
1232 case Opt_tcp:
1233 mnt->flags |= NFS_MOUNT_TCP;
1234 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1235 break;
1236 case Opt_rdma:
1237 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1238 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1239 xprt_load_transport(p);
1240 break;
1241 case Opt_acl:
1242 mnt->flags &= ~NFS_MOUNT_NOACL;
1243 break;
1244 case Opt_noacl:
1245 mnt->flags |= NFS_MOUNT_NOACL;
1246 break;
1247 case Opt_rdirplus:
1248 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1249 break;
1250 case Opt_nordirplus:
1251 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1252 break;
1253 case Opt_sharecache:
1254 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1255 break;
1256 case Opt_nosharecache:
1257 mnt->flags |= NFS_MOUNT_UNSHARED;
1258 break;
1259 case Opt_resvport:
1260 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1261 break;
1262 case Opt_noresvport:
1263 mnt->flags |= NFS_MOUNT_NORESVPORT;
1264 break;
1265 case Opt_fscache:
1266 mnt->options |= NFS_OPTION_FSCACHE;
1267 kfree(mnt->fscache_uniq);
1268 mnt->fscache_uniq = NULL;
1269 break;
1270 case Opt_nofscache:
1271 mnt->options &= ~NFS_OPTION_FSCACHE;
1272 kfree(mnt->fscache_uniq);
1273 mnt->fscache_uniq = NULL;
1274 break;
1275
1276 /*
1277 * options that take numeric values
1278 */
1279 case Opt_port:
1280 if (nfs_get_option_ul(args, &option) ||
1281 option > USHRT_MAX)
1282 goto out_invalid_value;
1283 mnt->nfs_server.port = option;
1284 break;
1285 case Opt_rsize:
1286 if (nfs_get_option_ul(args, &option))
1287 goto out_invalid_value;
1288 mnt->rsize = option;
1289 break;
1290 case Opt_wsize:
1291 if (nfs_get_option_ul(args, &option))
1292 goto out_invalid_value;
1293 mnt->wsize = option;
1294 break;
1295 case Opt_bsize:
1296 if (nfs_get_option_ul(args, &option))
1297 goto out_invalid_value;
1298 mnt->bsize = option;
1299 break;
1300 case Opt_timeo:
1301 if (nfs_get_option_ul(args, &option) || option == 0)
1302 goto out_invalid_value;
1303 mnt->timeo = option;
1304 break;
1305 case Opt_retrans:
1306 if (nfs_get_option_ul(args, &option) || option == 0)
1307 goto out_invalid_value;
1308 mnt->retrans = option;
1309 break;
1310 case Opt_acregmin:
1311 if (nfs_get_option_ul(args, &option))
1312 goto out_invalid_value;
1313 mnt->acregmin = option;
1314 break;
1315 case Opt_acregmax:
1316 if (nfs_get_option_ul(args, &option))
1317 goto out_invalid_value;
1318 mnt->acregmax = option;
1319 break;
1320 case Opt_acdirmin:
1321 if (nfs_get_option_ul(args, &option))
1322 goto out_invalid_value;
1323 mnt->acdirmin = option;
1324 break;
1325 case Opt_acdirmax:
1326 if (nfs_get_option_ul(args, &option))
1327 goto out_invalid_value;
1328 mnt->acdirmax = option;
1329 break;
1330 case Opt_actimeo:
1331 if (nfs_get_option_ul(args, &option))
1332 goto out_invalid_value;
1333 mnt->acregmin = mnt->acregmax =
1334 mnt->acdirmin = mnt->acdirmax = option;
1335 break;
1336 case Opt_namelen:
1337 if (nfs_get_option_ul(args, &option))
1338 goto out_invalid_value;
1339 mnt->namlen = option;
1340 break;
1341 case Opt_mountport:
1342 if (nfs_get_option_ul(args, &option) ||
1343 option > USHRT_MAX)
1344 goto out_invalid_value;
1345 mnt->mount_server.port = option;
1346 break;
1347 case Opt_mountvers:
1348 if (nfs_get_option_ul(args, &option) ||
1349 option < NFS_MNT_VERSION ||
1350 option > NFS_MNT3_VERSION)
1351 goto out_invalid_value;
1352 mnt->mount_server.version = option;
1353 break;
1354 case Opt_minorversion:
1355 if (nfs_get_option_ul(args, &option))
1356 goto out_invalid_value;
1357 if (option > NFS4_MAX_MINOR_VERSION)
1358 goto out_invalid_value;
1359 mnt->minorversion = option;
1360 break;
1361
1362 /*
1363 * options that take text values
1364 */
1365 case Opt_nfsvers:
1366 string = match_strdup(args);
1367 if (string == NULL)
1368 goto out_nomem;
1369 rc = nfs_parse_version_string(string, mnt, args);
1370 kfree(string);
1371 if (!rc)
1372 goto out_invalid_value;
1373 break;
1374 case Opt_sec:
1375 string = match_strdup(args);
1376 if (string == NULL)
1377 goto out_nomem;
1378 rc = nfs_parse_security_flavors(string, mnt);
1379 kfree(string);
1380 if (!rc) {
1381 dfprintk(MOUNT, "NFS: unrecognized "
1382 "security flavor\n");
1383 return 0;
1384 }
1385 break;
1386 case Opt_proto:
1387 string = match_strdup(args);
1388 if (string == NULL)
1389 goto out_nomem;
1390 token = match_token(string,
1391 nfs_xprt_protocol_tokens, args);
1392
1393 protofamily = AF_INET;
1394 switch (token) {
1395 case Opt_xprt_udp6:
1396 protofamily = AF_INET6;
1397 case Opt_xprt_udp:
1398 mnt->flags &= ~NFS_MOUNT_TCP;
1399 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1400 break;
1401 case Opt_xprt_tcp6:
1402 protofamily = AF_INET6;
1403 case Opt_xprt_tcp:
1404 mnt->flags |= NFS_MOUNT_TCP;
1405 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1406 break;
1407 case Opt_xprt_rdma:
1408 /* vector side protocols to TCP */
1409 mnt->flags |= NFS_MOUNT_TCP;
1410 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1411 xprt_load_transport(string);
1412 break;
1413 default:
1414 dfprintk(MOUNT, "NFS: unrecognized "
1415 "transport protocol\n");
1416 kfree(string);
1417 return 0;
1418 }
1419 kfree(string);
1420 break;
1421 case Opt_mountproto:
1422 string = match_strdup(args);
1423 if (string == NULL)
1424 goto out_nomem;
1425 token = match_token(string,
1426 nfs_xprt_protocol_tokens, args);
1427 kfree(string);
1428
1429 mountfamily = AF_INET;
1430 switch (token) {
1431 case Opt_xprt_udp6:
1432 mountfamily = AF_INET6;
1433 case Opt_xprt_udp:
1434 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1435 break;
1436 case Opt_xprt_tcp6:
1437 mountfamily = AF_INET6;
1438 case Opt_xprt_tcp:
1439 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1440 break;
1441 case Opt_xprt_rdma: /* not used for side protocols */
1442 default:
1443 dfprintk(MOUNT, "NFS: unrecognized "
1444 "transport protocol\n");
1445 return 0;
1446 }
1447 break;
1448 case Opt_addr:
1449 string = match_strdup(args);
1450 if (string == NULL)
1451 goto out_nomem;
1452 mnt->nfs_server.addrlen =
1453 rpc_pton(mnt->net, string, strlen(string),
1454 (struct sockaddr *)
1455 &mnt->nfs_server.address,
1456 sizeof(mnt->nfs_server.address));
1457 kfree(string);
1458 if (mnt->nfs_server.addrlen == 0)
1459 goto out_invalid_address;
1460 break;
1461 case Opt_clientaddr:
1462 if (nfs_get_option_str(args, &mnt->client_address))
1463 goto out_nomem;
1464 break;
1465 case Opt_mounthost:
1466 if (nfs_get_option_str(args,
1467 &mnt->mount_server.hostname))
1468 goto out_nomem;
1469 break;
1470 case Opt_mountaddr:
1471 string = match_strdup(args);
1472 if (string == NULL)
1473 goto out_nomem;
1474 mnt->mount_server.addrlen =
1475 rpc_pton(mnt->net, string, strlen(string),
1476 (struct sockaddr *)
1477 &mnt->mount_server.address,
1478 sizeof(mnt->mount_server.address));
1479 kfree(string);
1480 if (mnt->mount_server.addrlen == 0)
1481 goto out_invalid_address;
1482 break;
1483 case Opt_lookupcache:
1484 string = match_strdup(args);
1485 if (string == NULL)
1486 goto out_nomem;
1487 token = match_token(string,
1488 nfs_lookupcache_tokens, args);
1489 kfree(string);
1490 switch (token) {
1491 case Opt_lookupcache_all:
1492 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1493 break;
1494 case Opt_lookupcache_positive:
1495 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1496 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1497 break;
1498 case Opt_lookupcache_none:
1499 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1500 break;
1501 default:
1502 dfprintk(MOUNT, "NFS: invalid "
1503 "lookupcache argument\n");
1504 return 0;
1505 };
1506 break;
1507 case Opt_fscache_uniq:
1508 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1509 goto out_nomem;
1510 mnt->options |= NFS_OPTION_FSCACHE;
1511 break;
1512 case Opt_local_lock:
1513 string = match_strdup(args);
1514 if (string == NULL)
1515 goto out_nomem;
1516 token = match_token(string, nfs_local_lock_tokens,
1517 args);
1518 kfree(string);
1519 switch (token) {
1520 case Opt_local_lock_all:
1521 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1522 NFS_MOUNT_LOCAL_FCNTL);
1523 break;
1524 case Opt_local_lock_flock:
1525 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1526 break;
1527 case Opt_local_lock_posix:
1528 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1529 break;
1530 case Opt_local_lock_none:
1531 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1532 NFS_MOUNT_LOCAL_FCNTL);
1533 break;
1534 default:
1535 dfprintk(MOUNT, "NFS: invalid "
1536 "local_lock argument\n");
1537 return 0;
1538 };
1539 break;
1540
1541 /*
1542 * Special options
1543 */
1544 case Opt_sloppy:
1545 sloppy = 1;
1546 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1547 break;
1548 case Opt_userspace:
1549 case Opt_deprecated:
1550 dfprintk(MOUNT, "NFS: ignoring mount option "
1551 "'%s'\n", p);
1552 break;
1553
1554 default:
1555 invalid_option = 1;
1556 dfprintk(MOUNT, "NFS: unrecognized mount option "
1557 "'%s'\n", p);
1558 }
1559 }
1560
1561 if (!sloppy && invalid_option)
1562 return 0;
1563
1564 if (mnt->minorversion && mnt->version != 4)
1565 goto out_minorversion_mismatch;
1566
1567 /*
1568 * verify that any proto=/mountproto= options match the address
1569 * familiies in the addr=/mountaddr= options.
1570 */
1571 if (protofamily != AF_UNSPEC &&
1572 protofamily != mnt->nfs_server.address.ss_family)
1573 goto out_proto_mismatch;
1574
1575 if (mountfamily != AF_UNSPEC) {
1576 if (mnt->mount_server.addrlen) {
1577 if (mountfamily != mnt->mount_server.address.ss_family)
1578 goto out_mountproto_mismatch;
1579 } else {
1580 if (mountfamily != mnt->nfs_server.address.ss_family)
1581 goto out_mountproto_mismatch;
1582 }
1583 }
1584
1585 return 1;
1586
1587 out_mountproto_mismatch:
1588 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1589 "option\n");
1590 return 0;
1591 out_proto_mismatch:
1592 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1593 return 0;
1594 out_invalid_address:
1595 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1596 return 0;
1597 out_invalid_value:
1598 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1599 return 0;
1600 out_minorversion_mismatch:
1601 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1602 "minorversion=%u\n", mnt->version, mnt->minorversion);
1603 return 0;
1604 out_nomem:
1605 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1606 return 0;
1607 out_security_failure:
1608 free_secdata(secdata);
1609 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1610 return 0;
1611 }
1612
1613 /*
1614 * Match the requested auth flavors with the list returned by
1615 * the server. Returns zero and sets the mount's authentication
1616 * flavor on success; returns -EACCES if server does not support
1617 * the requested flavor.
1618 */
1619 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1620 struct nfs_mount_request *request)
1621 {
1622 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1623
1624 /*
1625 * Certain releases of Linux's mountd return an empty
1626 * flavor list. To prevent behavioral regression with
1627 * these servers (ie. rejecting mounts that used to
1628 * succeed), revert to pre-2.6.32 behavior (no checking)
1629 * if the returned flavor list is empty.
1630 */
1631 if (server_authlist_len == 0)
1632 return 0;
1633
1634 /*
1635 * We avoid sophisticated negotiating here, as there are
1636 * plenty of cases where we can get it wrong, providing
1637 * either too little or too much security.
1638 *
1639 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1640 * flavor listed first. However, some servers list
1641 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1642 * preferred default, in args->auth_flavors[0] if user
1643 * didn't specify sec= mount option.
1644 */
1645 for (i = 0; i < args->auth_flavor_len; i++)
1646 for (j = 0; j < server_authlist_len; j++)
1647 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1648 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1649 request->auth_flavs[j]);
1650 args->auth_flavors[0] = request->auth_flavs[j];
1651 return 0;
1652 }
1653
1654 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1655 nfs_umount(request);
1656 return -EACCES;
1657 }
1658
1659 /*
1660 * Use the remote server's MOUNT service to request the NFS file handle
1661 * corresponding to the provided path.
1662 */
1663 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1664 struct nfs_fh *root_fh)
1665 {
1666 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1667 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1668 struct nfs_mount_request request = {
1669 .sap = (struct sockaddr *)
1670 &args->mount_server.address,
1671 .dirpath = args->nfs_server.export_path,
1672 .protocol = args->mount_server.protocol,
1673 .fh = root_fh,
1674 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1675 .auth_flav_len = &server_authlist_len,
1676 .auth_flavs = server_authlist,
1677 .net = args->net,
1678 };
1679 int status;
1680
1681 if (args->mount_server.version == 0) {
1682 switch (args->version) {
1683 default:
1684 args->mount_server.version = NFS_MNT3_VERSION;
1685 break;
1686 case 2:
1687 args->mount_server.version = NFS_MNT_VERSION;
1688 }
1689 }
1690 request.version = args->mount_server.version;
1691
1692 if (args->mount_server.hostname)
1693 request.hostname = args->mount_server.hostname;
1694 else
1695 request.hostname = args->nfs_server.hostname;
1696
1697 /*
1698 * Construct the mount server's address.
1699 */
1700 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1701 memcpy(request.sap, &args->nfs_server.address,
1702 args->nfs_server.addrlen);
1703 args->mount_server.addrlen = args->nfs_server.addrlen;
1704 }
1705 request.salen = args->mount_server.addrlen;
1706 nfs_set_port(request.sap, &args->mount_server.port, 0);
1707
1708 /*
1709 * Now ask the mount server to map our export path
1710 * to a file handle.
1711 */
1712 status = nfs_mount(&request);
1713 if (status != 0) {
1714 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1715 request.hostname, status);
1716 return status;
1717 }
1718
1719 /*
1720 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1721 */
1722 if (args->mount_server.version != NFS_MNT3_VERSION)
1723 return 0;
1724 return nfs_walk_authlist(args, &request);
1725 }
1726
1727 /*
1728 * Split "dev_name" into "hostname:export_path".
1729 *
1730 * The leftmost colon demarks the split between the server's hostname
1731 * and the export path. If the hostname starts with a left square
1732 * bracket, then it may contain colons.
1733 *
1734 * Note: caller frees hostname and export path, even on error.
1735 */
1736 static int nfs_parse_devname(const char *dev_name,
1737 char **hostname, size_t maxnamlen,
1738 char **export_path, size_t maxpathlen)
1739 {
1740 size_t len;
1741 char *end;
1742
1743 /* Is the host name protected with square brakcets? */
1744 if (*dev_name == '[') {
1745 end = strchr(++dev_name, ']');
1746 if (end == NULL || end[1] != ':')
1747 goto out_bad_devname;
1748
1749 len = end - dev_name;
1750 end++;
1751 } else {
1752 char *comma;
1753
1754 end = strchr(dev_name, ':');
1755 if (end == NULL)
1756 goto out_bad_devname;
1757 len = end - dev_name;
1758
1759 /* kill possible hostname list: not supported */
1760 comma = strchr(dev_name, ',');
1761 if (comma != NULL && comma < end)
1762 *comma = 0;
1763 }
1764
1765 if (len > maxnamlen)
1766 goto out_hostname;
1767
1768 /* N.B. caller will free nfs_server.hostname in all cases */
1769 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1770 if (*hostname == NULL)
1771 goto out_nomem;
1772 len = strlen(++end);
1773 if (len > maxpathlen)
1774 goto out_path;
1775 *export_path = kstrndup(end, len, GFP_KERNEL);
1776 if (!*export_path)
1777 goto out_nomem;
1778
1779 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1780 return 0;
1781
1782 out_bad_devname:
1783 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1784 return -EINVAL;
1785
1786 out_nomem:
1787 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1788 return -ENOMEM;
1789
1790 out_hostname:
1791 dfprintk(MOUNT, "NFS: server hostname too long\n");
1792 return -ENAMETOOLONG;
1793
1794 out_path:
1795 dfprintk(MOUNT, "NFS: export pathname too long\n");
1796 return -ENAMETOOLONG;
1797 }
1798
1799 /*
1800 * Validate the NFS2/NFS3 mount data
1801 * - fills in the mount root filehandle
1802 *
1803 * For option strings, user space handles the following behaviors:
1804 *
1805 * + DNS: mapping server host name to IP address ("addr=" option)
1806 *
1807 * + failure mode: how to behave if a mount request can't be handled
1808 * immediately ("fg/bg" option)
1809 *
1810 * + retry: how often to retry a mount request ("retry=" option)
1811 *
1812 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1813 * mountproto=tcp after mountproto=udp, and so on
1814 */
1815 static int nfs_validate_mount_data(void *options,
1816 struct nfs_parsed_mount_data *args,
1817 struct nfs_fh *mntfh,
1818 const char *dev_name)
1819 {
1820 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1821 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1822
1823 if (data == NULL)
1824 goto out_no_data;
1825
1826 switch (data->version) {
1827 case 1:
1828 data->namlen = 0;
1829 case 2:
1830 data->bsize = 0;
1831 case 3:
1832 if (data->flags & NFS_MOUNT_VER3)
1833 goto out_no_v3;
1834 data->root.size = NFS2_FHSIZE;
1835 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1836 case 4:
1837 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1838 goto out_no_sec;
1839 case 5:
1840 memset(data->context, 0, sizeof(data->context));
1841 case 6:
1842 if (data->flags & NFS_MOUNT_VER3) {
1843 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1844 goto out_invalid_fh;
1845 mntfh->size = data->root.size;
1846 args->version = 3;
1847 } else {
1848 mntfh->size = NFS2_FHSIZE;
1849 args->version = 2;
1850 }
1851
1852
1853 memcpy(mntfh->data, data->root.data, mntfh->size);
1854 if (mntfh->size < sizeof(mntfh->data))
1855 memset(mntfh->data + mntfh->size, 0,
1856 sizeof(mntfh->data) - mntfh->size);
1857
1858 /*
1859 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1860 * can deal with.
1861 */
1862 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1863 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1864 args->rsize = data->rsize;
1865 args->wsize = data->wsize;
1866 args->timeo = data->timeo;
1867 args->retrans = data->retrans;
1868 args->acregmin = data->acregmin;
1869 args->acregmax = data->acregmax;
1870 args->acdirmin = data->acdirmin;
1871 args->acdirmax = data->acdirmax;
1872
1873 memcpy(sap, &data->addr, sizeof(data->addr));
1874 args->nfs_server.addrlen = sizeof(data->addr);
1875 if (!nfs_verify_server_address(sap))
1876 goto out_no_address;
1877
1878 if (!(data->flags & NFS_MOUNT_TCP))
1879 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1880 /* N.B. caller will free nfs_server.hostname in all cases */
1881 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1882 args->namlen = data->namlen;
1883 args->bsize = data->bsize;
1884
1885 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1886 args->auth_flavors[0] = data->pseudoflavor;
1887 if (!args->nfs_server.hostname)
1888 goto out_nomem;
1889
1890 if (!(data->flags & NFS_MOUNT_NONLM))
1891 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1892 NFS_MOUNT_LOCAL_FCNTL);
1893 else
1894 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1895 NFS_MOUNT_LOCAL_FCNTL);
1896 /*
1897 * The legacy version 6 binary mount data from userspace has a
1898 * field used only to transport selinux information into the
1899 * the kernel. To continue to support that functionality we
1900 * have a touch of selinux knowledge here in the NFS code. The
1901 * userspace code converted context=blah to just blah so we are
1902 * converting back to the full string selinux understands.
1903 */
1904 if (data->context[0]){
1905 #ifdef CONFIG_SECURITY_SELINUX
1906 int rc;
1907 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1908 if (!opts_str)
1909 return -ENOMEM;
1910 strcpy(opts_str, "context=");
1911 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1912 strcat(opts_str, &data->context[0]);
1913 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1914 kfree(opts_str);
1915 if (rc)
1916 return rc;
1917 #else
1918 return -EINVAL;
1919 #endif
1920 }
1921
1922 break;
1923 default: {
1924 int status;
1925
1926 if (nfs_parse_mount_options((char *)options, args) == 0)
1927 return -EINVAL;
1928
1929 if (!nfs_verify_server_address(sap))
1930 goto out_no_address;
1931
1932 if (args->version == 4)
1933 #ifdef CONFIG_NFS_V4
1934 return nfs4_validate_text_mount_data(options,
1935 args, dev_name);
1936 #else
1937 goto out_v4_not_compiled;
1938 #endif
1939
1940 nfs_set_port(sap, &args->nfs_server.port, 0);
1941
1942 nfs_set_mount_transport_protocol(args);
1943
1944 status = nfs_parse_devname(dev_name,
1945 &args->nfs_server.hostname,
1946 PAGE_SIZE,
1947 &args->nfs_server.export_path,
1948 NFS_MAXPATHLEN);
1949 if (!status)
1950 status = nfs_try_mount(args, mntfh);
1951
1952 kfree(args->nfs_server.export_path);
1953 args->nfs_server.export_path = NULL;
1954
1955 if (status)
1956 return status;
1957
1958 break;
1959 }
1960 }
1961
1962 #ifndef CONFIG_NFS_V3
1963 if (args->version == 3)
1964 goto out_v3_not_compiled;
1965 #endif /* !CONFIG_NFS_V3 */
1966
1967 return 0;
1968
1969 out_no_data:
1970 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1971 return -EINVAL;
1972
1973 out_no_v3:
1974 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1975 data->version);
1976 return -EINVAL;
1977
1978 out_no_sec:
1979 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1980 return -EINVAL;
1981
1982 #ifndef CONFIG_NFS_V3
1983 out_v3_not_compiled:
1984 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1985 return -EPROTONOSUPPORT;
1986 #endif /* !CONFIG_NFS_V3 */
1987
1988 #ifndef CONFIG_NFS_V4
1989 out_v4_not_compiled:
1990 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1991 return -EPROTONOSUPPORT;
1992 #endif /* !CONFIG_NFS_V4 */
1993
1994 out_nomem:
1995 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1996 return -ENOMEM;
1997
1998 out_no_address:
1999 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2000 return -EINVAL;
2001
2002 out_invalid_fh:
2003 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2004 return -EINVAL;
2005 }
2006
2007 static int
2008 nfs_compare_remount_data(struct nfs_server *nfss,
2009 struct nfs_parsed_mount_data *data)
2010 {
2011 if (data->flags != nfss->flags ||
2012 data->rsize != nfss->rsize ||
2013 data->wsize != nfss->wsize ||
2014 data->retrans != nfss->client->cl_timeout->to_retries ||
2015 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2016 data->acregmin != nfss->acregmin / HZ ||
2017 data->acregmax != nfss->acregmax / HZ ||
2018 data->acdirmin != nfss->acdirmin / HZ ||
2019 data->acdirmax != nfss->acdirmax / HZ ||
2020 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2021 data->nfs_server.port != nfss->port ||
2022 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2023 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2024 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2025 return -EINVAL;
2026
2027 return 0;
2028 }
2029
2030 static int
2031 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2032 {
2033 int error;
2034 struct nfs_server *nfss = sb->s_fs_info;
2035 struct nfs_parsed_mount_data *data;
2036 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2037 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2038 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2039
2040 /*
2041 * Userspace mount programs that send binary options generally send
2042 * them populated with default values. We have no way to know which
2043 * ones were explicitly specified. Fall back to legacy behavior and
2044 * just return success.
2045 */
2046 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2047 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2048 options->version <= 6))))
2049 return 0;
2050
2051 data = kzalloc(sizeof(*data), GFP_KERNEL);
2052 if (data == NULL)
2053 return -ENOMEM;
2054
2055 /* fill out struct with values from existing mount */
2056 data->flags = nfss->flags;
2057 data->rsize = nfss->rsize;
2058 data->wsize = nfss->wsize;
2059 data->retrans = nfss->client->cl_timeout->to_retries;
2060 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2061 data->acregmin = nfss->acregmin / HZ;
2062 data->acregmax = nfss->acregmax / HZ;
2063 data->acdirmin = nfss->acdirmin / HZ;
2064 data->acdirmax = nfss->acdirmax / HZ;
2065 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2066 data->nfs_server.port = nfss->port;
2067 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2068 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2069 data->nfs_server.addrlen);
2070
2071 /* overwrite those values with any that were specified */
2072 error = nfs_parse_mount_options((char *)options, data);
2073 if (error < 0)
2074 goto out;
2075
2076 /*
2077 * noac is a special case. It implies -o sync, but that's not
2078 * necessarily reflected in the mtab options. do_remount_sb
2079 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2080 * remount options, so we have to explicitly reset it.
2081 */
2082 if (data->flags & NFS_MOUNT_NOAC)
2083 *flags |= MS_SYNCHRONOUS;
2084
2085 /* compare new mount options with old ones */
2086 error = nfs_compare_remount_data(nfss, data);
2087 out:
2088 kfree(data);
2089 return error;
2090 }
2091
2092 /*
2093 * Initialise the common bits of the superblock
2094 */
2095 static inline void nfs_initialise_sb(struct super_block *sb)
2096 {
2097 struct nfs_server *server = NFS_SB(sb);
2098
2099 sb->s_magic = NFS_SUPER_MAGIC;
2100
2101 /* We probably want something more informative here */
2102 snprintf(sb->s_id, sizeof(sb->s_id),
2103 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2104
2105 if (sb->s_blocksize == 0)
2106 sb->s_blocksize = nfs_block_bits(server->wsize,
2107 &sb->s_blocksize_bits);
2108
2109 sb->s_bdi = &server->backing_dev_info;
2110
2111 nfs_super_set_maxbytes(sb, server->maxfilesize);
2112 }
2113
2114 /*
2115 * Finish setting up an NFS2/3 superblock
2116 */
2117 static void nfs_fill_super(struct super_block *sb,
2118 struct nfs_parsed_mount_data *data)
2119 {
2120 struct nfs_server *server = NFS_SB(sb);
2121
2122 sb->s_blocksize_bits = 0;
2123 sb->s_blocksize = 0;
2124 if (data->bsize)
2125 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2126
2127 if (server->nfs_client->rpc_ops->version == 3) {
2128 /* The VFS shouldn't apply the umask to mode bits. We will do
2129 * so ourselves when necessary.
2130 */
2131 sb->s_flags |= MS_POSIXACL;
2132 sb->s_time_gran = 1;
2133 }
2134
2135 sb->s_op = &nfs_sops;
2136 nfs_initialise_sb(sb);
2137 }
2138
2139 /*
2140 * Finish setting up a cloned NFS2/3 superblock
2141 */
2142 static void nfs_clone_super(struct super_block *sb,
2143 const struct super_block *old_sb)
2144 {
2145 struct nfs_server *server = NFS_SB(sb);
2146
2147 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2148 sb->s_blocksize = old_sb->s_blocksize;
2149 sb->s_maxbytes = old_sb->s_maxbytes;
2150
2151 if (server->nfs_client->rpc_ops->version == 3) {
2152 /* The VFS shouldn't apply the umask to mode bits. We will do
2153 * so ourselves when necessary.
2154 */
2155 sb->s_flags |= MS_POSIXACL;
2156 sb->s_time_gran = 1;
2157 }
2158
2159 sb->s_op = old_sb->s_op;
2160 nfs_initialise_sb(sb);
2161 }
2162
2163 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2164 {
2165 const struct nfs_server *a = s->s_fs_info;
2166 const struct rpc_clnt *clnt_a = a->client;
2167 const struct rpc_clnt *clnt_b = b->client;
2168
2169 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2170 goto Ebusy;
2171 if (a->nfs_client != b->nfs_client)
2172 goto Ebusy;
2173 if (a->flags != b->flags)
2174 goto Ebusy;
2175 if (a->wsize != b->wsize)
2176 goto Ebusy;
2177 if (a->rsize != b->rsize)
2178 goto Ebusy;
2179 if (a->acregmin != b->acregmin)
2180 goto Ebusy;
2181 if (a->acregmax != b->acregmax)
2182 goto Ebusy;
2183 if (a->acdirmin != b->acdirmin)
2184 goto Ebusy;
2185 if (a->acdirmax != b->acdirmax)
2186 goto Ebusy;
2187 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2188 goto Ebusy;
2189 return 1;
2190 Ebusy:
2191 return 0;
2192 }
2193
2194 struct nfs_sb_mountdata {
2195 struct nfs_server *server;
2196 int mntflags;
2197 };
2198
2199 static int nfs_set_super(struct super_block *s, void *data)
2200 {
2201 struct nfs_sb_mountdata *sb_mntdata = data;
2202 struct nfs_server *server = sb_mntdata->server;
2203 int ret;
2204
2205 s->s_flags = sb_mntdata->mntflags;
2206 s->s_fs_info = server;
2207 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2208 ret = set_anon_super(s, server);
2209 if (ret == 0)
2210 server->s_dev = s->s_dev;
2211 return ret;
2212 }
2213
2214 static int nfs_compare_super_address(struct nfs_server *server1,
2215 struct nfs_server *server2)
2216 {
2217 struct sockaddr *sap1, *sap2;
2218
2219 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2220 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2221
2222 if (sap1->sa_family != sap2->sa_family)
2223 return 0;
2224
2225 switch (sap1->sa_family) {
2226 case AF_INET: {
2227 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2228 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2229 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2230 return 0;
2231 if (sin1->sin_port != sin2->sin_port)
2232 return 0;
2233 break;
2234 }
2235 case AF_INET6: {
2236 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2237 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2238 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2239 return 0;
2240 if (sin1->sin6_port != sin2->sin6_port)
2241 return 0;
2242 break;
2243 }
2244 default:
2245 return 0;
2246 }
2247
2248 return 1;
2249 }
2250
2251 static int nfs_compare_super(struct super_block *sb, void *data)
2252 {
2253 struct nfs_sb_mountdata *sb_mntdata = data;
2254 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2255 int mntflags = sb_mntdata->mntflags;
2256
2257 if (!nfs_compare_super_address(old, server))
2258 return 0;
2259 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2260 if (old->flags & NFS_MOUNT_UNSHARED)
2261 return 0;
2262 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2263 return 0;
2264 return nfs_compare_mount_options(sb, server, mntflags);
2265 }
2266
2267 static int nfs_bdi_register(struct nfs_server *server)
2268 {
2269 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2270 }
2271
2272 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2273 int flags, const char *dev_name, void *raw_data)
2274 {
2275 struct nfs_server *server = NULL;
2276 struct super_block *s;
2277 struct nfs_parsed_mount_data *data;
2278 struct nfs_fh *mntfh;
2279 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2280 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2281 struct nfs_sb_mountdata sb_mntdata = {
2282 .mntflags = flags,
2283 };
2284 int error;
2285
2286 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2287 mntfh = nfs_alloc_fhandle();
2288 if (data == NULL || mntfh == NULL)
2289 goto out;
2290
2291 /* Validate the mount data */
2292 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2293 if (error < 0) {
2294 mntroot = ERR_PTR(error);
2295 goto out;
2296 }
2297
2298 #ifdef CONFIG_NFS_V4
2299 if (data->version == 4) {
2300 mntroot = nfs4_try_mount(flags, dev_name, data);
2301 goto out;
2302 }
2303 #endif /* CONFIG_NFS_V4 */
2304
2305 /* Get a volume representation */
2306 server = nfs_create_server(data, mntfh);
2307 if (IS_ERR(server)) {
2308 mntroot = ERR_CAST(server);
2309 goto out;
2310 }
2311 sb_mntdata.server = server;
2312
2313 if (server->flags & NFS_MOUNT_UNSHARED)
2314 compare_super = NULL;
2315
2316 /* -o noac implies -o sync */
2317 if (server->flags & NFS_MOUNT_NOAC)
2318 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2319
2320 /* Get a superblock - note that we may end up sharing one that already exists */
2321 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2322 if (IS_ERR(s)) {
2323 mntroot = ERR_CAST(s);
2324 goto out_err_nosb;
2325 }
2326
2327 if (s->s_fs_info != server) {
2328 nfs_free_server(server);
2329 server = NULL;
2330 } else {
2331 error = nfs_bdi_register(server);
2332 if (error) {
2333 mntroot = ERR_PTR(error);
2334 goto error_splat_bdi;
2335 }
2336 }
2337
2338 if (!s->s_root) {
2339 /* initial superblock/root creation */
2340 nfs_fill_super(s, data);
2341 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2342 }
2343
2344 mntroot = nfs_get_root(s, mntfh, dev_name);
2345 if (IS_ERR(mntroot))
2346 goto error_splat_super;
2347
2348 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2349 if (error)
2350 goto error_splat_root;
2351
2352 s->s_flags |= MS_ACTIVE;
2353
2354 out:
2355 nfs_free_parsed_mount_data(data);
2356 nfs_free_fhandle(mntfh);
2357 return mntroot;
2358
2359 out_err_nosb:
2360 nfs_free_server(server);
2361 goto out;
2362
2363 error_splat_root:
2364 dput(mntroot);
2365 mntroot = ERR_PTR(error);
2366 error_splat_super:
2367 if (server && !s->s_root)
2368 bdi_unregister(&server->backing_dev_info);
2369 error_splat_bdi:
2370 deactivate_locked_super(s);
2371 goto out;
2372 }
2373
2374 /*
2375 * Ensure that we unregister the bdi before kill_anon_super
2376 * releases the device name
2377 */
2378 static void nfs_put_super(struct super_block *s)
2379 {
2380 struct nfs_server *server = NFS_SB(s);
2381
2382 bdi_unregister(&server->backing_dev_info);
2383 }
2384
2385 /*
2386 * Destroy an NFS2/3 superblock
2387 */
2388 static void nfs_kill_super(struct super_block *s)
2389 {
2390 struct nfs_server *server = NFS_SB(s);
2391
2392 kill_anon_super(s);
2393 nfs_fscache_release_super_cookie(s);
2394 nfs_free_server(server);
2395 }
2396
2397 /*
2398 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2399 */
2400 static struct dentry *
2401 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2402 const char *dev_name, void *raw_data)
2403 {
2404 struct nfs_clone_mount *data = raw_data;
2405 struct super_block *s;
2406 struct nfs_server *server;
2407 struct dentry *mntroot;
2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2409 struct nfs_sb_mountdata sb_mntdata = {
2410 .mntflags = flags,
2411 };
2412 int error;
2413
2414 dprintk("--> nfs_xdev_mount()\n");
2415
2416 /* create a new volume representation */
2417 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2418 if (IS_ERR(server)) {
2419 error = PTR_ERR(server);
2420 goto out_err_noserver;
2421 }
2422 sb_mntdata.server = server;
2423
2424 if (server->flags & NFS_MOUNT_UNSHARED)
2425 compare_super = NULL;
2426
2427 /* -o noac implies -o sync */
2428 if (server->flags & NFS_MOUNT_NOAC)
2429 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2430
2431 /* Get a superblock - note that we may end up sharing one that already exists */
2432 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2433 if (IS_ERR(s)) {
2434 error = PTR_ERR(s);
2435 goto out_err_nosb;
2436 }
2437
2438 if (s->s_fs_info != server) {
2439 nfs_free_server(server);
2440 server = NULL;
2441 } else {
2442 error = nfs_bdi_register(server);
2443 if (error)
2444 goto error_splat_bdi;
2445 }
2446
2447 if (!s->s_root) {
2448 /* initial superblock/root creation */
2449 nfs_clone_super(s, data->sb);
2450 nfs_fscache_get_super_cookie(s, NULL, data);
2451 }
2452
2453 mntroot = nfs_get_root(s, data->fh, dev_name);
2454 if (IS_ERR(mntroot)) {
2455 error = PTR_ERR(mntroot);
2456 goto error_splat_super;
2457 }
2458 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2459 dput(mntroot);
2460 error = -ESTALE;
2461 goto error_splat_super;
2462 }
2463
2464 s->s_flags |= MS_ACTIVE;
2465
2466 /* clone any lsm security options from the parent to the new sb */
2467 security_sb_clone_mnt_opts(data->sb, s);
2468
2469 dprintk("<-- nfs_xdev_mount() = 0\n");
2470 return mntroot;
2471
2472 out_err_nosb:
2473 nfs_free_server(server);
2474 out_err_noserver:
2475 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2476 return ERR_PTR(error);
2477
2478 error_splat_super:
2479 if (server && !s->s_root)
2480 bdi_unregister(&server->backing_dev_info);
2481 error_splat_bdi:
2482 deactivate_locked_super(s);
2483 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2484 return ERR_PTR(error);
2485 }
2486
2487 #ifdef CONFIG_NFS_V4
2488
2489 /*
2490 * Finish setting up a cloned NFS4 superblock
2491 */
2492 static void nfs4_clone_super(struct super_block *sb,
2493 const struct super_block *old_sb)
2494 {
2495 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2496 sb->s_blocksize = old_sb->s_blocksize;
2497 sb->s_maxbytes = old_sb->s_maxbytes;
2498 sb->s_time_gran = 1;
2499 sb->s_op = old_sb->s_op;
2500 /*
2501 * The VFS shouldn't apply the umask to mode bits. We will do
2502 * so ourselves when necessary.
2503 */
2504 sb->s_flags |= MS_POSIXACL;
2505 sb->s_xattr = old_sb->s_xattr;
2506 nfs_initialise_sb(sb);
2507 }
2508
2509 /*
2510 * Set up an NFS4 superblock
2511 */
2512 static void nfs4_fill_super(struct super_block *sb)
2513 {
2514 sb->s_time_gran = 1;
2515 sb->s_op = &nfs4_sops;
2516 /*
2517 * The VFS shouldn't apply the umask to mode bits. We will do
2518 * so ourselves when necessary.
2519 */
2520 sb->s_flags |= MS_POSIXACL;
2521 sb->s_xattr = nfs4_xattr_handlers;
2522 nfs_initialise_sb(sb);
2523 }
2524
2525 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2526 {
2527 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2528 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2529 }
2530
2531 static int nfs4_validate_text_mount_data(void *options,
2532 struct nfs_parsed_mount_data *args,
2533 const char *dev_name)
2534 {
2535 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2536
2537 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2538
2539 nfs_validate_transport_protocol(args);
2540
2541 nfs4_validate_mount_flags(args);
2542
2543 if (args->version != 4) {
2544 dfprintk(MOUNT,
2545 "NFS4: Illegal mount version\n");
2546 return -EINVAL;
2547 }
2548
2549 if (args->auth_flavor_len > 1) {
2550 dfprintk(MOUNT,
2551 "NFS4: Too many RPC auth flavours specified\n");
2552 return -EINVAL;
2553 }
2554
2555 if (args->client_address == NULL) {
2556 dfprintk(MOUNT,
2557 "NFS4: mount program didn't pass callback address\n");
2558 return -EINVAL;
2559 }
2560
2561 return nfs_parse_devname(dev_name,
2562 &args->nfs_server.hostname,
2563 NFS4_MAXNAMLEN,
2564 &args->nfs_server.export_path,
2565 NFS4_MAXPATHLEN);
2566 }
2567
2568 /*
2569 * Validate NFSv4 mount options
2570 */
2571 static int nfs4_validate_mount_data(void *options,
2572 struct nfs_parsed_mount_data *args,
2573 const char *dev_name)
2574 {
2575 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2576 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2577 char *c;
2578
2579 if (data == NULL)
2580 goto out_no_data;
2581
2582 switch (data->version) {
2583 case 1:
2584 if (data->host_addrlen > sizeof(args->nfs_server.address))
2585 goto out_no_address;
2586 if (data->host_addrlen == 0)
2587 goto out_no_address;
2588 args->nfs_server.addrlen = data->host_addrlen;
2589 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2590 return -EFAULT;
2591 if (!nfs_verify_server_address(sap))
2592 goto out_no_address;
2593
2594 if (data->auth_flavourlen) {
2595 if (data->auth_flavourlen > 1)
2596 goto out_inval_auth;
2597 if (copy_from_user(&args->auth_flavors[0],
2598 data->auth_flavours,
2599 sizeof(args->auth_flavors[0])))
2600 return -EFAULT;
2601 }
2602
2603 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2604 if (IS_ERR(c))
2605 return PTR_ERR(c);
2606 args->nfs_server.hostname = c;
2607
2608 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2609 if (IS_ERR(c))
2610 return PTR_ERR(c);
2611 args->nfs_server.export_path = c;
2612 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2613
2614 c = strndup_user(data->client_addr.data, 16);
2615 if (IS_ERR(c))
2616 return PTR_ERR(c);
2617 args->client_address = c;
2618
2619 /*
2620 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2621 * can deal with.
2622 */
2623
2624 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2625 args->rsize = data->rsize;
2626 args->wsize = data->wsize;
2627 args->timeo = data->timeo;
2628 args->retrans = data->retrans;
2629 args->acregmin = data->acregmin;
2630 args->acregmax = data->acregmax;
2631 args->acdirmin = data->acdirmin;
2632 args->acdirmax = data->acdirmax;
2633 args->nfs_server.protocol = data->proto;
2634 nfs_validate_transport_protocol(args);
2635
2636 break;
2637 default:
2638 if (nfs_parse_mount_options((char *)options, args) == 0)
2639 return -EINVAL;
2640
2641 if (!nfs_verify_server_address(sap))
2642 return -EINVAL;
2643
2644 return nfs4_validate_text_mount_data(options, args, dev_name);
2645 }
2646
2647 return 0;
2648
2649 out_no_data:
2650 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2651 return -EINVAL;
2652
2653 out_inval_auth:
2654 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2655 data->auth_flavourlen);
2656 return -EINVAL;
2657
2658 out_no_address:
2659 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2660 return -EINVAL;
2661 }
2662
2663 /*
2664 * Get the superblock for the NFS4 root partition
2665 */
2666 static struct dentry *
2667 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2668 const char *dev_name, void *raw_data)
2669 {
2670 struct nfs_parsed_mount_data *data = raw_data;
2671 struct super_block *s;
2672 struct nfs_server *server;
2673 struct nfs_fh *mntfh;
2674 struct dentry *mntroot;
2675 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2676 struct nfs_sb_mountdata sb_mntdata = {
2677 .mntflags = flags,
2678 };
2679 int error = -ENOMEM;
2680
2681 mntfh = nfs_alloc_fhandle();
2682 if (data == NULL || mntfh == NULL)
2683 goto out;
2684
2685 /* Get a volume representation */
2686 server = nfs4_create_server(data, mntfh);
2687 if (IS_ERR(server)) {
2688 error = PTR_ERR(server);
2689 goto out;
2690 }
2691 sb_mntdata.server = server;
2692
2693 if (server->flags & NFS4_MOUNT_UNSHARED)
2694 compare_super = NULL;
2695
2696 /* -o noac implies -o sync */
2697 if (server->flags & NFS_MOUNT_NOAC)
2698 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2699
2700 /* Get a superblock - note that we may end up sharing one that already exists */
2701 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2702 if (IS_ERR(s)) {
2703 error = PTR_ERR(s);
2704 goto out_free;
2705 }
2706
2707 if (s->s_fs_info != server) {
2708 nfs_free_server(server);
2709 server = NULL;
2710 } else {
2711 error = nfs_bdi_register(server);
2712 if (error)
2713 goto error_splat_bdi;
2714 }
2715
2716 if (!s->s_root) {
2717 /* initial superblock/root creation */
2718 nfs4_fill_super(s);
2719 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2720 }
2721
2722 mntroot = nfs4_get_root(s, mntfh, dev_name);
2723 if (IS_ERR(mntroot)) {
2724 error = PTR_ERR(mntroot);
2725 goto error_splat_super;
2726 }
2727
2728 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2729 if (error)
2730 goto error_splat_root;
2731
2732 s->s_flags |= MS_ACTIVE;
2733
2734 nfs_free_fhandle(mntfh);
2735 return mntroot;
2736
2737 out:
2738 nfs_free_fhandle(mntfh);
2739 return ERR_PTR(error);
2740
2741 out_free:
2742 nfs_free_server(server);
2743 goto out;
2744
2745 error_splat_root:
2746 dput(mntroot);
2747 error_splat_super:
2748 if (server && !s->s_root)
2749 bdi_unregister(&server->backing_dev_info);
2750 error_splat_bdi:
2751 deactivate_locked_super(s);
2752 goto out;
2753 }
2754
2755 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2756 int flags, void *data, const char *hostname)
2757 {
2758 struct vfsmount *root_mnt;
2759 char *root_devname;
2760 size_t len;
2761
2762 len = strlen(hostname) + 3;
2763 root_devname = kmalloc(len, GFP_KERNEL);
2764 if (root_devname == NULL)
2765 return ERR_PTR(-ENOMEM);
2766 snprintf(root_devname, len, "%s:/", hostname);
2767 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2768 kfree(root_devname);
2769 return root_mnt;
2770 }
2771
2772 struct nfs_referral_count {
2773 struct list_head list;
2774 const struct task_struct *task;
2775 unsigned int referral_count;
2776 };
2777
2778 static LIST_HEAD(nfs_referral_count_list);
2779 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2780
2781 static struct nfs_referral_count *nfs_find_referral_count(void)
2782 {
2783 struct nfs_referral_count *p;
2784
2785 list_for_each_entry(p, &nfs_referral_count_list, list) {
2786 if (p->task == current)
2787 return p;
2788 }
2789 return NULL;
2790 }
2791
2792 #define NFS_MAX_NESTED_REFERRALS 2
2793
2794 static int nfs_referral_loop_protect(void)
2795 {
2796 struct nfs_referral_count *p, *new;
2797 int ret = -ENOMEM;
2798
2799 new = kmalloc(sizeof(*new), GFP_KERNEL);
2800 if (!new)
2801 goto out;
2802 new->task = current;
2803 new->referral_count = 1;
2804
2805 ret = 0;
2806 spin_lock(&nfs_referral_count_list_lock);
2807 p = nfs_find_referral_count();
2808 if (p != NULL) {
2809 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2810 ret = -ELOOP;
2811 else
2812 p->referral_count++;
2813 } else {
2814 list_add(&new->list, &nfs_referral_count_list);
2815 new = NULL;
2816 }
2817 spin_unlock(&nfs_referral_count_list_lock);
2818 kfree(new);
2819 out:
2820 return ret;
2821 }
2822
2823 static void nfs_referral_loop_unprotect(void)
2824 {
2825 struct nfs_referral_count *p;
2826
2827 spin_lock(&nfs_referral_count_list_lock);
2828 p = nfs_find_referral_count();
2829 p->referral_count--;
2830 if (p->referral_count == 0)
2831 list_del(&p->list);
2832 else
2833 p = NULL;
2834 spin_unlock(&nfs_referral_count_list_lock);
2835 kfree(p);
2836 }
2837
2838 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2839 const char *export_path)
2840 {
2841 struct dentry *dentry;
2842 int err;
2843
2844 if (IS_ERR(root_mnt))
2845 return ERR_CAST(root_mnt);
2846
2847 err = nfs_referral_loop_protect();
2848 if (err) {
2849 mntput(root_mnt);
2850 return ERR_PTR(err);
2851 }
2852
2853 dentry = mount_subtree(root_mnt, export_path);
2854 nfs_referral_loop_unprotect();
2855
2856 return dentry;
2857 }
2858
2859 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2860 struct nfs_parsed_mount_data *data)
2861 {
2862 char *export_path;
2863 struct vfsmount *root_mnt;
2864 struct dentry *res;
2865
2866 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2867
2868 export_path = data->nfs_server.export_path;
2869 data->nfs_server.export_path = "/";
2870 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2871 data->nfs_server.hostname);
2872 data->nfs_server.export_path = export_path;
2873
2874 res = nfs_follow_remote_path(root_mnt, export_path);
2875
2876 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2877 IS_ERR(res) ? PTR_ERR(res) : 0,
2878 IS_ERR(res) ? " [error]" : "");
2879 return res;
2880 }
2881
2882 /*
2883 * Get the superblock for an NFS4 mountpoint
2884 */
2885 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2886 int flags, const char *dev_name, void *raw_data)
2887 {
2888 struct nfs_parsed_mount_data *data;
2889 int error = -ENOMEM;
2890 struct dentry *res = ERR_PTR(-ENOMEM);
2891
2892 data = nfs_alloc_parsed_mount_data(4);
2893 if (data == NULL)
2894 goto out;
2895
2896 /* Validate the mount data */
2897 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2898 if (error < 0) {
2899 res = ERR_PTR(error);
2900 goto out;
2901 }
2902
2903 res = nfs4_try_mount(flags, dev_name, data);
2904 if (IS_ERR(res))
2905 error = PTR_ERR(res);
2906
2907 out:
2908 nfs_free_parsed_mount_data(data);
2909 dprintk("<-- nfs4_mount() = %d%s\n", error,
2910 error != 0 ? " [error]" : "");
2911 return res;
2912 }
2913
2914 static void nfs4_kill_super(struct super_block *sb)
2915 {
2916 struct nfs_server *server = NFS_SB(sb);
2917
2918 dprintk("--> %s\n", __func__);
2919 nfs_super_return_all_delegations(sb);
2920 kill_anon_super(sb);
2921 nfs_fscache_release_super_cookie(sb);
2922 nfs_free_server(server);
2923 dprintk("<-- %s\n", __func__);
2924 }
2925
2926 /*
2927 * Clone an NFS4 server record on xdev traversal (FSID-change)
2928 */
2929 static struct dentry *
2930 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2931 const char *dev_name, void *raw_data)
2932 {
2933 struct nfs_clone_mount *data = raw_data;
2934 struct super_block *s;
2935 struct nfs_server *server;
2936 struct dentry *mntroot;
2937 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2938 struct nfs_sb_mountdata sb_mntdata = {
2939 .mntflags = flags,
2940 };
2941 int error;
2942
2943 dprintk("--> nfs4_xdev_mount()\n");
2944
2945 /* create a new volume representation */
2946 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2947 if (IS_ERR(server)) {
2948 error = PTR_ERR(server);
2949 goto out_err_noserver;
2950 }
2951 sb_mntdata.server = server;
2952
2953 if (server->flags & NFS4_MOUNT_UNSHARED)
2954 compare_super = NULL;
2955
2956 /* -o noac implies -o sync */
2957 if (server->flags & NFS_MOUNT_NOAC)
2958 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2959
2960 /* Get a superblock - note that we may end up sharing one that already exists */
2961 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2962 if (IS_ERR(s)) {
2963 error = PTR_ERR(s);
2964 goto out_err_nosb;
2965 }
2966
2967 if (s->s_fs_info != server) {
2968 nfs_free_server(server);
2969 server = NULL;
2970 } else {
2971 error = nfs_bdi_register(server);
2972 if (error)
2973 goto error_splat_bdi;
2974 }
2975
2976 if (!s->s_root) {
2977 /* initial superblock/root creation */
2978 nfs4_clone_super(s, data->sb);
2979 nfs_fscache_get_super_cookie(s, NULL, data);
2980 }
2981
2982 mntroot = nfs4_get_root(s, data->fh, dev_name);
2983 if (IS_ERR(mntroot)) {
2984 error = PTR_ERR(mntroot);
2985 goto error_splat_super;
2986 }
2987 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2988 dput(mntroot);
2989 error = -ESTALE;
2990 goto error_splat_super;
2991 }
2992
2993 s->s_flags |= MS_ACTIVE;
2994
2995 security_sb_clone_mnt_opts(data->sb, s);
2996
2997 dprintk("<-- nfs4_xdev_mount() = 0\n");
2998 return mntroot;
2999
3000 out_err_nosb:
3001 nfs_free_server(server);
3002 out_err_noserver:
3003 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3004 return ERR_PTR(error);
3005
3006 error_splat_super:
3007 if (server && !s->s_root)
3008 bdi_unregister(&server->backing_dev_info);
3009 error_splat_bdi:
3010 deactivate_locked_super(s);
3011 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3012 return ERR_PTR(error);
3013 }
3014
3015 static struct dentry *
3016 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3017 const char *dev_name, void *raw_data)
3018 {
3019 struct nfs_clone_mount *data = raw_data;
3020 struct super_block *s;
3021 struct nfs_server *server;
3022 struct dentry *mntroot;
3023 struct nfs_fh *mntfh;
3024 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3025 struct nfs_sb_mountdata sb_mntdata = {
3026 .mntflags = flags,
3027 };
3028 int error = -ENOMEM;
3029
3030 dprintk("--> nfs4_referral_get_sb()\n");
3031
3032 mntfh = nfs_alloc_fhandle();
3033 if (mntfh == NULL)
3034 goto out_err_nofh;
3035
3036 /* create a new volume representation */
3037 server = nfs4_create_referral_server(data, mntfh);
3038 if (IS_ERR(server)) {
3039 error = PTR_ERR(server);
3040 goto out_err_noserver;
3041 }
3042 sb_mntdata.server = server;
3043
3044 if (server->flags & NFS4_MOUNT_UNSHARED)
3045 compare_super = NULL;
3046
3047 /* -o noac implies -o sync */
3048 if (server->flags & NFS_MOUNT_NOAC)
3049 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3050
3051 /* Get a superblock - note that we may end up sharing one that already exists */
3052 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3053 if (IS_ERR(s)) {
3054 error = PTR_ERR(s);
3055 goto out_err_nosb;
3056 }
3057
3058 if (s->s_fs_info != server) {
3059 nfs_free_server(server);
3060 server = NULL;
3061 } else {
3062 error = nfs_bdi_register(server);
3063 if (error)
3064 goto error_splat_bdi;
3065 }
3066
3067 if (!s->s_root) {
3068 /* initial superblock/root creation */
3069 nfs4_fill_super(s);
3070 nfs_fscache_get_super_cookie(s, NULL, data);
3071 }
3072
3073 mntroot = nfs4_get_root(s, mntfh, dev_name);
3074 if (IS_ERR(mntroot)) {
3075 error = PTR_ERR(mntroot);
3076 goto error_splat_super;
3077 }
3078 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3079 dput(mntroot);
3080 error = -ESTALE;
3081 goto error_splat_super;
3082 }
3083
3084 s->s_flags |= MS_ACTIVE;
3085
3086 security_sb_clone_mnt_opts(data->sb, s);
3087
3088 nfs_free_fhandle(mntfh);
3089 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3090 return mntroot;
3091
3092 out_err_nosb:
3093 nfs_free_server(server);
3094 out_err_noserver:
3095 nfs_free_fhandle(mntfh);
3096 out_err_nofh:
3097 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3098 return ERR_PTR(error);
3099
3100 error_splat_super:
3101 if (server && !s->s_root)
3102 bdi_unregister(&server->backing_dev_info);
3103 error_splat_bdi:
3104 deactivate_locked_super(s);
3105 nfs_free_fhandle(mntfh);
3106 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3107 return ERR_PTR(error);
3108 }
3109
3110 /*
3111 * Create an NFS4 server record on referral traversal
3112 */
3113 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3114 int flags, const char *dev_name, void *raw_data)
3115 {
3116 struct nfs_clone_mount *data = raw_data;
3117 char *export_path;
3118 struct vfsmount *root_mnt;
3119 struct dentry *res;
3120
3121 dprintk("--> nfs4_referral_mount()\n");
3122
3123 export_path = data->mnt_path;
3124 data->mnt_path = "/";
3125
3126 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3127 flags, data, data->hostname);
3128 data->mnt_path = export_path;
3129
3130 res = nfs_follow_remote_path(root_mnt, export_path);
3131 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3132 IS_ERR(res) ? PTR_ERR(res) : 0,
3133 IS_ERR(res) ? " [error]" : "");
3134 return res;
3135 }
3136
3137 #endif /* CONFIG_NFS_V4 */
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