1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
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 */
register_nfs_fs(void)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 */
unregister_nfs_fs(void)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
nfs_sb_active(struct super_block * sb)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
nfs_sb_deactive(struct super_block * sb)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 */
nfs_statfs(struct dentry * dentry,struct kstatfs * buf)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 */
nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)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
nfs_show_mountd_netid(struct seq_file * m,struct nfs_server * nfss,int showdefaults)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
nfs_show_mountd_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)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
nfs_show_nfsv4_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)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
nfs_show_nfsv4_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)642 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
643 int showdefaults)
644 {
645 }
646 #endif
647
nfs_show_nfs_version(struct seq_file * m,unsigned int version,unsigned int minorversion)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 */
nfs_show_mount_options(struct seq_file * m,struct nfs_server * nfss,int showdefaults)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 rcu_read_lock();
705 seq_printf(m, ",proto=%s",
706 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
707 rcu_read_unlock();
708 if (version == 4) {
709 if (nfss->port != NFS_PORT)
710 seq_printf(m, ",port=%u", nfss->port);
711 } else
712 if (nfss->port)
713 seq_printf(m, ",port=%u", nfss->port);
714
715 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
716 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
717 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
718
719 if (version != 4)
720 nfs_show_mountd_options(m, nfss, showdefaults);
721 else
722 nfs_show_nfsv4_options(m, nfss, showdefaults);
723
724 if (nfss->options & NFS_OPTION_FSCACHE)
725 seq_printf(m, ",fsc");
726
727 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
728 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
729 seq_printf(m, ",lookupcache=none");
730 else
731 seq_printf(m, ",lookupcache=pos");
732 }
733
734 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
735 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
736
737 if (!local_flock && !local_fcntl)
738 seq_printf(m, ",local_lock=none");
739 else if (local_flock && local_fcntl)
740 seq_printf(m, ",local_lock=all");
741 else if (local_flock)
742 seq_printf(m, ",local_lock=flock");
743 else
744 seq_printf(m, ",local_lock=posix");
745 }
746
747 /*
748 * Describe the mount options on this VFS mountpoint
749 */
nfs_show_options(struct seq_file * m,struct dentry * root)750 static int nfs_show_options(struct seq_file *m, struct dentry *root)
751 {
752 struct nfs_server *nfss = NFS_SB(root->d_sb);
753
754 nfs_show_mount_options(m, nfss, 0);
755
756 rcu_read_lock();
757 seq_printf(m, ",addr=%s",
758 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
759 RPC_DISPLAY_ADDR));
760 rcu_read_unlock();
761
762 return 0;
763 }
764
765 #ifdef CONFIG_NFS_V4
766 #ifdef CONFIG_NFS_V4_1
show_sessions(struct seq_file * m,struct nfs_server * server)767 static void show_sessions(struct seq_file *m, struct nfs_server *server)
768 {
769 if (nfs4_has_session(server->nfs_client))
770 seq_printf(m, ",sessions");
771 }
772 #else
show_sessions(struct seq_file * m,struct nfs_server * server)773 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
774 #endif
775 #endif
776
777 #ifdef CONFIG_NFS_V4_1
show_pnfs(struct seq_file * m,struct nfs_server * server)778 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
779 {
780 seq_printf(m, ",pnfs=");
781 if (server->pnfs_curr_ld)
782 seq_printf(m, "%s", server->pnfs_curr_ld->name);
783 else
784 seq_printf(m, "not configured");
785 }
786
show_implementation_id(struct seq_file * m,struct nfs_server * nfss)787 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
788 {
789 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
790 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
791 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
792 "date='%llu,%u'",
793 impl_id->name, impl_id->domain,
794 impl_id->date.seconds, impl_id->date.nseconds);
795 }
796 }
797 #else
798 #ifdef CONFIG_NFS_V4
show_pnfs(struct seq_file * m,struct nfs_server * server)799 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
800 {
801 }
802 #endif
show_implementation_id(struct seq_file * m,struct nfs_server * nfss)803 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
804 {
805 }
806 #endif
807
nfs_show_devname(struct seq_file * m,struct dentry * root)808 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
809 {
810 char *page = (char *) __get_free_page(GFP_KERNEL);
811 char *devname, *dummy;
812 int err = 0;
813 if (!page)
814 return -ENOMEM;
815 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
816 if (IS_ERR(devname))
817 err = PTR_ERR(devname);
818 else
819 seq_escape(m, devname, " \t\n\\");
820 free_page((unsigned long)page);
821 return err;
822 }
823
nfs_show_path(struct seq_file * m,struct dentry * dentry)824 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
825 {
826 seq_puts(m, "/");
827 return 0;
828 }
829
830 /*
831 * Present statistical information for this VFS mountpoint
832 */
nfs_show_stats(struct seq_file * m,struct dentry * root)833 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
834 {
835 int i, cpu;
836 struct nfs_server *nfss = NFS_SB(root->d_sb);
837 struct rpc_auth *auth = nfss->client->cl_auth;
838 struct nfs_iostats totals = { };
839
840 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
841
842 /*
843 * Display all mount option settings
844 */
845 seq_printf(m, "\n\topts:\t");
846 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
847 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
848 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
849 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
850 nfs_show_mount_options(m, nfss, 1);
851
852 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
853
854 show_implementation_id(m, nfss);
855
856 seq_printf(m, "\n\tcaps:\t");
857 seq_printf(m, "caps=0x%x", nfss->caps);
858 seq_printf(m, ",wtmult=%u", nfss->wtmult);
859 seq_printf(m, ",dtsize=%u", nfss->dtsize);
860 seq_printf(m, ",bsize=%u", nfss->bsize);
861 seq_printf(m, ",namlen=%u", nfss->namelen);
862
863 #ifdef CONFIG_NFS_V4
864 if (nfss->nfs_client->rpc_ops->version == 4) {
865 seq_printf(m, "\n\tnfsv4:\t");
866 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
867 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
868 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
869 show_sessions(m, nfss);
870 show_pnfs(m, nfss);
871 }
872 #endif
873
874 /*
875 * Display security flavor in effect for this mount
876 */
877 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
878 if (auth->au_flavor)
879 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
880
881 /*
882 * Display superblock I/O counters
883 */
884 for_each_possible_cpu(cpu) {
885 struct nfs_iostats *stats;
886
887 preempt_disable();
888 stats = per_cpu_ptr(nfss->io_stats, cpu);
889
890 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
891 totals.events[i] += stats->events[i];
892 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
893 totals.bytes[i] += stats->bytes[i];
894 #ifdef CONFIG_NFS_FSCACHE
895 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
896 totals.fscache[i] += stats->fscache[i];
897 #endif
898
899 preempt_enable();
900 }
901
902 seq_printf(m, "\n\tevents:\t");
903 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
904 seq_printf(m, "%lu ", totals.events[i]);
905 seq_printf(m, "\n\tbytes:\t");
906 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
907 seq_printf(m, "%Lu ", totals.bytes[i]);
908 #ifdef CONFIG_NFS_FSCACHE
909 if (nfss->options & NFS_OPTION_FSCACHE) {
910 seq_printf(m, "\n\tfsc:\t");
911 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
912 seq_printf(m, "%Lu ", totals.bytes[i]);
913 }
914 #endif
915 seq_printf(m, "\n");
916
917 rpc_print_iostats(m, nfss->client);
918
919 return 0;
920 }
921
922 /*
923 * Begin unmount by attempting to remove all automounted mountpoints we added
924 * in response to xdev traversals and referrals
925 */
nfs_umount_begin(struct super_block * sb)926 static void nfs_umount_begin(struct super_block *sb)
927 {
928 struct nfs_server *server;
929 struct rpc_clnt *rpc;
930
931 server = NFS_SB(sb);
932 /* -EIO all pending I/O */
933 rpc = server->client_acl;
934 if (!IS_ERR(rpc))
935 rpc_killall_tasks(rpc);
936 rpc = server->client;
937 if (!IS_ERR(rpc))
938 rpc_killall_tasks(rpc);
939 }
940
nfs_alloc_parsed_mount_data(unsigned int version)941 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
942 {
943 struct nfs_parsed_mount_data *data;
944
945 data = kzalloc(sizeof(*data), GFP_KERNEL);
946 if (data) {
947 data->acregmin = NFS_DEF_ACREGMIN;
948 data->acregmax = NFS_DEF_ACREGMAX;
949 data->acdirmin = NFS_DEF_ACDIRMIN;
950 data->acdirmax = NFS_DEF_ACDIRMAX;
951 data->mount_server.port = NFS_UNSPEC_PORT;
952 data->nfs_server.port = NFS_UNSPEC_PORT;
953 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
954 data->auth_flavors[0] = RPC_AUTH_UNIX;
955 data->auth_flavor_len = 1;
956 data->version = version;
957 data->minorversion = 0;
958 data->net = current->nsproxy->net_ns;
959 security_init_mnt_opts(&data->lsm_opts);
960 }
961 return data;
962 }
963
nfs_free_parsed_mount_data(struct nfs_parsed_mount_data * data)964 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
965 {
966 if (data) {
967 kfree(data->client_address);
968 kfree(data->mount_server.hostname);
969 kfree(data->nfs_server.export_path);
970 kfree(data->nfs_server.hostname);
971 kfree(data->fscache_uniq);
972 security_free_mnt_opts(&data->lsm_opts);
973 kfree(data);
974 }
975 }
976
977 /*
978 * Sanity-check a server address provided by the mount command.
979 *
980 * Address family must be initialized, and address must not be
981 * the ANY address for that family.
982 */
nfs_verify_server_address(struct sockaddr * addr)983 static int nfs_verify_server_address(struct sockaddr *addr)
984 {
985 switch (addr->sa_family) {
986 case AF_INET: {
987 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
988 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
989 }
990 case AF_INET6: {
991 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
992 return !ipv6_addr_any(sa);
993 }
994 }
995
996 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
997 return 0;
998 }
999
1000 /*
1001 * Select between a default port value and a user-specified port value.
1002 * If a zero value is set, then autobind will be used.
1003 */
nfs_set_port(struct sockaddr * sap,int * port,const unsigned short default_port)1004 static void nfs_set_port(struct sockaddr *sap, int *port,
1005 const unsigned short default_port)
1006 {
1007 if (*port == NFS_UNSPEC_PORT)
1008 *port = default_port;
1009
1010 rpc_set_port(sap, *port);
1011 }
1012
1013 /*
1014 * Sanity check the NFS transport protocol.
1015 *
1016 */
nfs_validate_transport_protocol(struct nfs_parsed_mount_data * mnt)1017 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1018 {
1019 switch (mnt->nfs_server.protocol) {
1020 case XPRT_TRANSPORT_UDP:
1021 case XPRT_TRANSPORT_TCP:
1022 case XPRT_TRANSPORT_RDMA:
1023 break;
1024 default:
1025 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1026 }
1027 }
1028
1029 /*
1030 * For text based NFSv2/v3 mounts, the mount protocol transport default
1031 * settings should depend upon the specified NFS transport.
1032 */
nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data * mnt)1033 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1034 {
1035 nfs_validate_transport_protocol(mnt);
1036
1037 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1038 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1039 return;
1040 switch (mnt->nfs_server.protocol) {
1041 case XPRT_TRANSPORT_UDP:
1042 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1043 break;
1044 case XPRT_TRANSPORT_TCP:
1045 case XPRT_TRANSPORT_RDMA:
1046 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1047 }
1048 }
1049
1050 /*
1051 * Parse the value of the 'sec=' option.
1052 */
nfs_parse_security_flavors(char * value,struct nfs_parsed_mount_data * mnt)1053 static int nfs_parse_security_flavors(char *value,
1054 struct nfs_parsed_mount_data *mnt)
1055 {
1056 substring_t args[MAX_OPT_ARGS];
1057
1058 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1059
1060 switch (match_token(value, nfs_secflavor_tokens, args)) {
1061 case Opt_sec_none:
1062 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1063 break;
1064 case Opt_sec_sys:
1065 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1066 break;
1067 case Opt_sec_krb5:
1068 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1069 break;
1070 case Opt_sec_krb5i:
1071 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1072 break;
1073 case Opt_sec_krb5p:
1074 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1075 break;
1076 case Opt_sec_lkey:
1077 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1078 break;
1079 case Opt_sec_lkeyi:
1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1081 break;
1082 case Opt_sec_lkeyp:
1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1084 break;
1085 case Opt_sec_spkm:
1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1087 break;
1088 case Opt_sec_spkmi:
1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1090 break;
1091 case Opt_sec_spkmp:
1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1093 break;
1094 default:
1095 return 0;
1096 }
1097
1098 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1099 mnt->auth_flavor_len = 1;
1100 return 1;
1101 }
1102
nfs_parse_version_string(char * string,struct nfs_parsed_mount_data * mnt,substring_t * args)1103 static int nfs_parse_version_string(char *string,
1104 struct nfs_parsed_mount_data *mnt,
1105 substring_t *args)
1106 {
1107 mnt->flags &= ~NFS_MOUNT_VER3;
1108 switch (match_token(string, nfs_vers_tokens, args)) {
1109 case Opt_vers_2:
1110 mnt->version = 2;
1111 break;
1112 case Opt_vers_3:
1113 mnt->flags |= NFS_MOUNT_VER3;
1114 mnt->version = 3;
1115 break;
1116 case Opt_vers_4:
1117 /* Backward compatibility option. In future,
1118 * the mount program should always supply
1119 * a NFSv4 minor version number.
1120 */
1121 mnt->version = 4;
1122 break;
1123 case Opt_vers_4_0:
1124 mnt->version = 4;
1125 mnt->minorversion = 0;
1126 break;
1127 case Opt_vers_4_1:
1128 mnt->version = 4;
1129 mnt->minorversion = 1;
1130 break;
1131 default:
1132 return 0;
1133 }
1134 return 1;
1135 }
1136
nfs_get_option_str(substring_t args[],char ** option)1137 static int nfs_get_option_str(substring_t args[], char **option)
1138 {
1139 kfree(*option);
1140 *option = match_strdup(args);
1141 return !*option;
1142 }
1143
nfs_get_option_ul(substring_t args[],unsigned long * option)1144 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1145 {
1146 int rc;
1147 char *string;
1148
1149 string = match_strdup(args);
1150 if (string == NULL)
1151 return -ENOMEM;
1152 rc = strict_strtoul(string, 10, option);
1153 kfree(string);
1154
1155 return rc;
1156 }
1157
1158 /*
1159 * Error-check and convert a string of mount options from user space into
1160 * a data structure. The whole mount string is processed; bad options are
1161 * skipped as they are encountered. If there were no errors, return 1;
1162 * otherwise return 0 (zero).
1163 */
nfs_parse_mount_options(char * raw,struct nfs_parsed_mount_data * mnt)1164 static int nfs_parse_mount_options(char *raw,
1165 struct nfs_parsed_mount_data *mnt)
1166 {
1167 char *p, *string, *secdata;
1168 int rc, sloppy = 0, invalid_option = 0;
1169 unsigned short protofamily = AF_UNSPEC;
1170 unsigned short mountfamily = AF_UNSPEC;
1171
1172 if (!raw) {
1173 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1174 return 1;
1175 }
1176 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1177
1178 secdata = alloc_secdata();
1179 if (!secdata)
1180 goto out_nomem;
1181
1182 rc = security_sb_copy_data(raw, secdata);
1183 if (rc)
1184 goto out_security_failure;
1185
1186 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1187 if (rc)
1188 goto out_security_failure;
1189
1190 free_secdata(secdata);
1191
1192 while ((p = strsep(&raw, ",")) != NULL) {
1193 substring_t args[MAX_OPT_ARGS];
1194 unsigned long option;
1195 int token;
1196
1197 if (!*p)
1198 continue;
1199
1200 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1201
1202 token = match_token(p, nfs_mount_option_tokens, args);
1203 switch (token) {
1204
1205 /*
1206 * boolean options: foo/nofoo
1207 */
1208 case Opt_soft:
1209 mnt->flags |= NFS_MOUNT_SOFT;
1210 break;
1211 case Opt_hard:
1212 mnt->flags &= ~NFS_MOUNT_SOFT;
1213 break;
1214 case Opt_posix:
1215 mnt->flags |= NFS_MOUNT_POSIX;
1216 break;
1217 case Opt_noposix:
1218 mnt->flags &= ~NFS_MOUNT_POSIX;
1219 break;
1220 case Opt_cto:
1221 mnt->flags &= ~NFS_MOUNT_NOCTO;
1222 break;
1223 case Opt_nocto:
1224 mnt->flags |= NFS_MOUNT_NOCTO;
1225 break;
1226 case Opt_ac:
1227 mnt->flags &= ~NFS_MOUNT_NOAC;
1228 break;
1229 case Opt_noac:
1230 mnt->flags |= NFS_MOUNT_NOAC;
1231 break;
1232 case Opt_lock:
1233 mnt->flags &= ~NFS_MOUNT_NONLM;
1234 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1235 NFS_MOUNT_LOCAL_FCNTL);
1236 break;
1237 case Opt_nolock:
1238 mnt->flags |= NFS_MOUNT_NONLM;
1239 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1240 NFS_MOUNT_LOCAL_FCNTL);
1241 break;
1242 case Opt_udp:
1243 mnt->flags &= ~NFS_MOUNT_TCP;
1244 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1245 break;
1246 case Opt_tcp:
1247 mnt->flags |= NFS_MOUNT_TCP;
1248 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1249 break;
1250 case Opt_rdma:
1251 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1252 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1253 xprt_load_transport(p);
1254 break;
1255 case Opt_acl:
1256 mnt->flags &= ~NFS_MOUNT_NOACL;
1257 break;
1258 case Opt_noacl:
1259 mnt->flags |= NFS_MOUNT_NOACL;
1260 break;
1261 case Opt_rdirplus:
1262 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1263 break;
1264 case Opt_nordirplus:
1265 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1266 break;
1267 case Opt_sharecache:
1268 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1269 break;
1270 case Opt_nosharecache:
1271 mnt->flags |= NFS_MOUNT_UNSHARED;
1272 break;
1273 case Opt_resvport:
1274 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1275 break;
1276 case Opt_noresvport:
1277 mnt->flags |= NFS_MOUNT_NORESVPORT;
1278 break;
1279 case Opt_fscache:
1280 mnt->options |= NFS_OPTION_FSCACHE;
1281 kfree(mnt->fscache_uniq);
1282 mnt->fscache_uniq = NULL;
1283 break;
1284 case Opt_nofscache:
1285 mnt->options &= ~NFS_OPTION_FSCACHE;
1286 kfree(mnt->fscache_uniq);
1287 mnt->fscache_uniq = NULL;
1288 break;
1289
1290 /*
1291 * options that take numeric values
1292 */
1293 case Opt_port:
1294 if (nfs_get_option_ul(args, &option) ||
1295 option > USHRT_MAX)
1296 goto out_invalid_value;
1297 mnt->nfs_server.port = option;
1298 break;
1299 case Opt_rsize:
1300 if (nfs_get_option_ul(args, &option))
1301 goto out_invalid_value;
1302 mnt->rsize = option;
1303 break;
1304 case Opt_wsize:
1305 if (nfs_get_option_ul(args, &option))
1306 goto out_invalid_value;
1307 mnt->wsize = option;
1308 break;
1309 case Opt_bsize:
1310 if (nfs_get_option_ul(args, &option))
1311 goto out_invalid_value;
1312 mnt->bsize = option;
1313 break;
1314 case Opt_timeo:
1315 if (nfs_get_option_ul(args, &option) || option == 0)
1316 goto out_invalid_value;
1317 mnt->timeo = option;
1318 break;
1319 case Opt_retrans:
1320 if (nfs_get_option_ul(args, &option) || option == 0)
1321 goto out_invalid_value;
1322 mnt->retrans = option;
1323 break;
1324 case Opt_acregmin:
1325 if (nfs_get_option_ul(args, &option))
1326 goto out_invalid_value;
1327 mnt->acregmin = option;
1328 break;
1329 case Opt_acregmax:
1330 if (nfs_get_option_ul(args, &option))
1331 goto out_invalid_value;
1332 mnt->acregmax = option;
1333 break;
1334 case Opt_acdirmin:
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->acdirmin = option;
1338 break;
1339 case Opt_acdirmax:
1340 if (nfs_get_option_ul(args, &option))
1341 goto out_invalid_value;
1342 mnt->acdirmax = option;
1343 break;
1344 case Opt_actimeo:
1345 if (nfs_get_option_ul(args, &option))
1346 goto out_invalid_value;
1347 mnt->acregmin = mnt->acregmax =
1348 mnt->acdirmin = mnt->acdirmax = option;
1349 break;
1350 case Opt_namelen:
1351 if (nfs_get_option_ul(args, &option))
1352 goto out_invalid_value;
1353 mnt->namlen = option;
1354 break;
1355 case Opt_mountport:
1356 if (nfs_get_option_ul(args, &option) ||
1357 option > USHRT_MAX)
1358 goto out_invalid_value;
1359 mnt->mount_server.port = option;
1360 break;
1361 case Opt_mountvers:
1362 if (nfs_get_option_ul(args, &option) ||
1363 option < NFS_MNT_VERSION ||
1364 option > NFS_MNT3_VERSION)
1365 goto out_invalid_value;
1366 mnt->mount_server.version = option;
1367 break;
1368 case Opt_minorversion:
1369 if (nfs_get_option_ul(args, &option))
1370 goto out_invalid_value;
1371 if (option > NFS4_MAX_MINOR_VERSION)
1372 goto out_invalid_value;
1373 mnt->minorversion = option;
1374 break;
1375
1376 /*
1377 * options that take text values
1378 */
1379 case Opt_nfsvers:
1380 string = match_strdup(args);
1381 if (string == NULL)
1382 goto out_nomem;
1383 rc = nfs_parse_version_string(string, mnt, args);
1384 kfree(string);
1385 if (!rc)
1386 goto out_invalid_value;
1387 break;
1388 case Opt_sec:
1389 string = match_strdup(args);
1390 if (string == NULL)
1391 goto out_nomem;
1392 rc = nfs_parse_security_flavors(string, mnt);
1393 kfree(string);
1394 if (!rc) {
1395 dfprintk(MOUNT, "NFS: unrecognized "
1396 "security flavor\n");
1397 return 0;
1398 }
1399 break;
1400 case Opt_proto:
1401 string = match_strdup(args);
1402 if (string == NULL)
1403 goto out_nomem;
1404 token = match_token(string,
1405 nfs_xprt_protocol_tokens, args);
1406
1407 protofamily = AF_INET;
1408 switch (token) {
1409 case Opt_xprt_udp6:
1410 protofamily = AF_INET6;
1411 case Opt_xprt_udp:
1412 mnt->flags &= ~NFS_MOUNT_TCP;
1413 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1414 break;
1415 case Opt_xprt_tcp6:
1416 protofamily = AF_INET6;
1417 case Opt_xprt_tcp:
1418 mnt->flags |= NFS_MOUNT_TCP;
1419 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1420 break;
1421 case Opt_xprt_rdma:
1422 /* vector side protocols to TCP */
1423 mnt->flags |= NFS_MOUNT_TCP;
1424 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1425 xprt_load_transport(string);
1426 break;
1427 default:
1428 dfprintk(MOUNT, "NFS: unrecognized "
1429 "transport protocol\n");
1430 kfree(string);
1431 return 0;
1432 }
1433 kfree(string);
1434 break;
1435 case Opt_mountproto:
1436 string = match_strdup(args);
1437 if (string == NULL)
1438 goto out_nomem;
1439 token = match_token(string,
1440 nfs_xprt_protocol_tokens, args);
1441 kfree(string);
1442
1443 mountfamily = AF_INET;
1444 switch (token) {
1445 case Opt_xprt_udp6:
1446 mountfamily = AF_INET6;
1447 case Opt_xprt_udp:
1448 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1449 break;
1450 case Opt_xprt_tcp6:
1451 mountfamily = AF_INET6;
1452 case Opt_xprt_tcp:
1453 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1454 break;
1455 case Opt_xprt_rdma: /* not used for side protocols */
1456 default:
1457 dfprintk(MOUNT, "NFS: unrecognized "
1458 "transport protocol\n");
1459 return 0;
1460 }
1461 break;
1462 case Opt_addr:
1463 string = match_strdup(args);
1464 if (string == NULL)
1465 goto out_nomem;
1466 mnt->nfs_server.addrlen =
1467 rpc_pton(mnt->net, string, strlen(string),
1468 (struct sockaddr *)
1469 &mnt->nfs_server.address,
1470 sizeof(mnt->nfs_server.address));
1471 kfree(string);
1472 if (mnt->nfs_server.addrlen == 0)
1473 goto out_invalid_address;
1474 break;
1475 case Opt_clientaddr:
1476 if (nfs_get_option_str(args, &mnt->client_address))
1477 goto out_nomem;
1478 break;
1479 case Opt_mounthost:
1480 if (nfs_get_option_str(args,
1481 &mnt->mount_server.hostname))
1482 goto out_nomem;
1483 break;
1484 case Opt_mountaddr:
1485 string = match_strdup(args);
1486 if (string == NULL)
1487 goto out_nomem;
1488 mnt->mount_server.addrlen =
1489 rpc_pton(mnt->net, string, strlen(string),
1490 (struct sockaddr *)
1491 &mnt->mount_server.address,
1492 sizeof(mnt->mount_server.address));
1493 kfree(string);
1494 if (mnt->mount_server.addrlen == 0)
1495 goto out_invalid_address;
1496 break;
1497 case Opt_lookupcache:
1498 string = match_strdup(args);
1499 if (string == NULL)
1500 goto out_nomem;
1501 token = match_token(string,
1502 nfs_lookupcache_tokens, args);
1503 kfree(string);
1504 switch (token) {
1505 case Opt_lookupcache_all:
1506 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1507 break;
1508 case Opt_lookupcache_positive:
1509 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1510 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1511 break;
1512 case Opt_lookupcache_none:
1513 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1514 break;
1515 default:
1516 dfprintk(MOUNT, "NFS: invalid "
1517 "lookupcache argument\n");
1518 return 0;
1519 };
1520 break;
1521 case Opt_fscache_uniq:
1522 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1523 goto out_nomem;
1524 mnt->options |= NFS_OPTION_FSCACHE;
1525 break;
1526 case Opt_local_lock:
1527 string = match_strdup(args);
1528 if (string == NULL)
1529 goto out_nomem;
1530 token = match_token(string, nfs_local_lock_tokens,
1531 args);
1532 kfree(string);
1533 switch (token) {
1534 case Opt_local_lock_all:
1535 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1536 NFS_MOUNT_LOCAL_FCNTL);
1537 break;
1538 case Opt_local_lock_flock:
1539 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1540 break;
1541 case Opt_local_lock_posix:
1542 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1543 break;
1544 case Opt_local_lock_none:
1545 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1546 NFS_MOUNT_LOCAL_FCNTL);
1547 break;
1548 default:
1549 dfprintk(MOUNT, "NFS: invalid "
1550 "local_lock argument\n");
1551 return 0;
1552 };
1553 break;
1554
1555 /*
1556 * Special options
1557 */
1558 case Opt_sloppy:
1559 sloppy = 1;
1560 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1561 break;
1562 case Opt_userspace:
1563 case Opt_deprecated:
1564 dfprintk(MOUNT, "NFS: ignoring mount option "
1565 "'%s'\n", p);
1566 break;
1567
1568 default:
1569 invalid_option = 1;
1570 dfprintk(MOUNT, "NFS: unrecognized mount option "
1571 "'%s'\n", p);
1572 }
1573 }
1574
1575 if (!sloppy && invalid_option)
1576 return 0;
1577
1578 if (mnt->minorversion && mnt->version != 4)
1579 goto out_minorversion_mismatch;
1580
1581 /*
1582 * verify that any proto=/mountproto= options match the address
1583 * familiies in the addr=/mountaddr= options.
1584 */
1585 if (protofamily != AF_UNSPEC &&
1586 protofamily != mnt->nfs_server.address.ss_family)
1587 goto out_proto_mismatch;
1588
1589 if (mountfamily != AF_UNSPEC) {
1590 if (mnt->mount_server.addrlen) {
1591 if (mountfamily != mnt->mount_server.address.ss_family)
1592 goto out_mountproto_mismatch;
1593 } else {
1594 if (mountfamily != mnt->nfs_server.address.ss_family)
1595 goto out_mountproto_mismatch;
1596 }
1597 }
1598
1599 return 1;
1600
1601 out_mountproto_mismatch:
1602 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1603 "option\n");
1604 return 0;
1605 out_proto_mismatch:
1606 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1607 return 0;
1608 out_invalid_address:
1609 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1610 return 0;
1611 out_invalid_value:
1612 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1613 return 0;
1614 out_minorversion_mismatch:
1615 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1616 "minorversion=%u\n", mnt->version, mnt->minorversion);
1617 return 0;
1618 out_nomem:
1619 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1620 return 0;
1621 out_security_failure:
1622 free_secdata(secdata);
1623 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1624 return 0;
1625 }
1626
1627 /*
1628 * Match the requested auth flavors with the list returned by
1629 * the server. Returns zero and sets the mount's authentication
1630 * flavor on success; returns -EACCES if server does not support
1631 * the requested flavor.
1632 */
nfs_walk_authlist(struct nfs_parsed_mount_data * args,struct nfs_mount_request * request)1633 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1634 struct nfs_mount_request *request)
1635 {
1636 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1637
1638 /*
1639 * Certain releases of Linux's mountd return an empty
1640 * flavor list. To prevent behavioral regression with
1641 * these servers (ie. rejecting mounts that used to
1642 * succeed), revert to pre-2.6.32 behavior (no checking)
1643 * if the returned flavor list is empty.
1644 */
1645 if (server_authlist_len == 0)
1646 return 0;
1647
1648 /*
1649 * We avoid sophisticated negotiating here, as there are
1650 * plenty of cases where we can get it wrong, providing
1651 * either too little or too much security.
1652 *
1653 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1654 * flavor listed first. However, some servers list
1655 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1656 * preferred default, in args->auth_flavors[0] if user
1657 * didn't specify sec= mount option.
1658 */
1659 for (i = 0; i < args->auth_flavor_len; i++)
1660 for (j = 0; j < server_authlist_len; j++)
1661 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1662 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1663 request->auth_flavs[j]);
1664 args->auth_flavors[0] = request->auth_flavs[j];
1665 return 0;
1666 }
1667
1668 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1669 nfs_umount(request);
1670 return -EACCES;
1671 }
1672
1673 /*
1674 * Use the remote server's MOUNT service to request the NFS file handle
1675 * corresponding to the provided path.
1676 */
nfs_try_mount(struct nfs_parsed_mount_data * args,struct nfs_fh * root_fh)1677 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1678 struct nfs_fh *root_fh)
1679 {
1680 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1681 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1682 struct nfs_mount_request request = {
1683 .sap = (struct sockaddr *)
1684 &args->mount_server.address,
1685 .dirpath = args->nfs_server.export_path,
1686 .protocol = args->mount_server.protocol,
1687 .fh = root_fh,
1688 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1689 .auth_flav_len = &server_authlist_len,
1690 .auth_flavs = server_authlist,
1691 .net = args->net,
1692 };
1693 int status;
1694
1695 if (args->mount_server.version == 0) {
1696 switch (args->version) {
1697 default:
1698 args->mount_server.version = NFS_MNT3_VERSION;
1699 break;
1700 case 2:
1701 args->mount_server.version = NFS_MNT_VERSION;
1702 }
1703 }
1704 request.version = args->mount_server.version;
1705
1706 if (args->mount_server.hostname)
1707 request.hostname = args->mount_server.hostname;
1708 else
1709 request.hostname = args->nfs_server.hostname;
1710
1711 /*
1712 * Construct the mount server's address.
1713 */
1714 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1715 memcpy(request.sap, &args->nfs_server.address,
1716 args->nfs_server.addrlen);
1717 args->mount_server.addrlen = args->nfs_server.addrlen;
1718 }
1719 request.salen = args->mount_server.addrlen;
1720 nfs_set_port(request.sap, &args->mount_server.port, 0);
1721
1722 /*
1723 * Now ask the mount server to map our export path
1724 * to a file handle.
1725 */
1726 status = nfs_mount(&request);
1727 if (status != 0) {
1728 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1729 request.hostname, status);
1730 return status;
1731 }
1732
1733 /*
1734 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1735 */
1736 if (args->mount_server.version != NFS_MNT3_VERSION)
1737 return 0;
1738 return nfs_walk_authlist(args, &request);
1739 }
1740
1741 /*
1742 * Split "dev_name" into "hostname:export_path".
1743 *
1744 * The leftmost colon demarks the split between the server's hostname
1745 * and the export path. If the hostname starts with a left square
1746 * bracket, then it may contain colons.
1747 *
1748 * Note: caller frees hostname and export path, even on error.
1749 */
nfs_parse_devname(const char * dev_name,char ** hostname,size_t maxnamlen,char ** export_path,size_t maxpathlen)1750 static int nfs_parse_devname(const char *dev_name,
1751 char **hostname, size_t maxnamlen,
1752 char **export_path, size_t maxpathlen)
1753 {
1754 size_t len;
1755 char *end;
1756
1757 /* Is the host name protected with square brakcets? */
1758 if (*dev_name == '[') {
1759 end = strchr(++dev_name, ']');
1760 if (end == NULL || end[1] != ':')
1761 goto out_bad_devname;
1762
1763 len = end - dev_name;
1764 end++;
1765 } else {
1766 char *comma;
1767
1768 end = strchr(dev_name, ':');
1769 if (end == NULL)
1770 goto out_bad_devname;
1771 len = end - dev_name;
1772
1773 /* kill possible hostname list: not supported */
1774 comma = strchr(dev_name, ',');
1775 if (comma != NULL && comma < end)
1776 *comma = 0;
1777 }
1778
1779 if (len > maxnamlen)
1780 goto out_hostname;
1781
1782 /* N.B. caller will free nfs_server.hostname in all cases */
1783 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1784 if (*hostname == NULL)
1785 goto out_nomem;
1786 len = strlen(++end);
1787 if (len > maxpathlen)
1788 goto out_path;
1789 *export_path = kstrndup(end, len, GFP_KERNEL);
1790 if (!*export_path)
1791 goto out_nomem;
1792
1793 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1794 return 0;
1795
1796 out_bad_devname:
1797 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1798 return -EINVAL;
1799
1800 out_nomem:
1801 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1802 return -ENOMEM;
1803
1804 out_hostname:
1805 dfprintk(MOUNT, "NFS: server hostname too long\n");
1806 return -ENAMETOOLONG;
1807
1808 out_path:
1809 dfprintk(MOUNT, "NFS: export pathname too long\n");
1810 return -ENAMETOOLONG;
1811 }
1812
1813 /*
1814 * Validate the NFS2/NFS3 mount data
1815 * - fills in the mount root filehandle
1816 *
1817 * For option strings, user space handles the following behaviors:
1818 *
1819 * + DNS: mapping server host name to IP address ("addr=" option)
1820 *
1821 * + failure mode: how to behave if a mount request can't be handled
1822 * immediately ("fg/bg" option)
1823 *
1824 * + retry: how often to retry a mount request ("retry=" option)
1825 *
1826 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1827 * mountproto=tcp after mountproto=udp, and so on
1828 */
nfs_validate_mount_data(void * options,struct nfs_parsed_mount_data * args,struct nfs_fh * mntfh,const char * dev_name)1829 static int nfs_validate_mount_data(void *options,
1830 struct nfs_parsed_mount_data *args,
1831 struct nfs_fh *mntfh,
1832 const char *dev_name)
1833 {
1834 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1835 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1836
1837 if (data == NULL)
1838 goto out_no_data;
1839
1840 switch (data->version) {
1841 case 1:
1842 data->namlen = 0;
1843 case 2:
1844 data->bsize = 0;
1845 case 3:
1846 if (data->flags & NFS_MOUNT_VER3)
1847 goto out_no_v3;
1848 data->root.size = NFS2_FHSIZE;
1849 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1850 case 4:
1851 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1852 goto out_no_sec;
1853 case 5:
1854 memset(data->context, 0, sizeof(data->context));
1855 case 6:
1856 if (data->flags & NFS_MOUNT_VER3) {
1857 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1858 goto out_invalid_fh;
1859 mntfh->size = data->root.size;
1860 args->version = 3;
1861 } else {
1862 mntfh->size = NFS2_FHSIZE;
1863 args->version = 2;
1864 }
1865
1866
1867 memcpy(mntfh->data, data->root.data, mntfh->size);
1868 if (mntfh->size < sizeof(mntfh->data))
1869 memset(mntfh->data + mntfh->size, 0,
1870 sizeof(mntfh->data) - mntfh->size);
1871
1872 /*
1873 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1874 * can deal with.
1875 */
1876 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1877 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1878 args->rsize = data->rsize;
1879 args->wsize = data->wsize;
1880 args->timeo = data->timeo;
1881 args->retrans = data->retrans;
1882 args->acregmin = data->acregmin;
1883 args->acregmax = data->acregmax;
1884 args->acdirmin = data->acdirmin;
1885 args->acdirmax = data->acdirmax;
1886
1887 memcpy(sap, &data->addr, sizeof(data->addr));
1888 args->nfs_server.addrlen = sizeof(data->addr);
1889 args->nfs_server.port = ntohs(data->addr.sin_port);
1890 if (!nfs_verify_server_address(sap))
1891 goto out_no_address;
1892
1893 if (!(data->flags & NFS_MOUNT_TCP))
1894 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1895 /* N.B. caller will free nfs_server.hostname in all cases */
1896 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1897 args->namlen = data->namlen;
1898 args->bsize = data->bsize;
1899
1900 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1901 args->auth_flavors[0] = data->pseudoflavor;
1902 if (!args->nfs_server.hostname)
1903 goto out_nomem;
1904
1905 if (!(data->flags & NFS_MOUNT_NONLM))
1906 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1907 NFS_MOUNT_LOCAL_FCNTL);
1908 else
1909 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1910 NFS_MOUNT_LOCAL_FCNTL);
1911 /*
1912 * The legacy version 6 binary mount data from userspace has a
1913 * field used only to transport selinux information into the
1914 * the kernel. To continue to support that functionality we
1915 * have a touch of selinux knowledge here in the NFS code. The
1916 * userspace code converted context=blah to just blah so we are
1917 * converting back to the full string selinux understands.
1918 */
1919 if (data->context[0]){
1920 #ifdef CONFIG_SECURITY_SELINUX
1921 int rc;
1922 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1923 if (!opts_str)
1924 return -ENOMEM;
1925 strcpy(opts_str, "context=");
1926 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1927 strcat(opts_str, &data->context[0]);
1928 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1929 kfree(opts_str);
1930 if (rc)
1931 return rc;
1932 #else
1933 return -EINVAL;
1934 #endif
1935 }
1936
1937 break;
1938 default: {
1939 int status;
1940
1941 if (nfs_parse_mount_options((char *)options, args) == 0)
1942 return -EINVAL;
1943
1944 if (!nfs_verify_server_address(sap))
1945 goto out_no_address;
1946
1947 if (args->version == 4)
1948 #ifdef CONFIG_NFS_V4
1949 return nfs4_validate_text_mount_data(options,
1950 args, dev_name);
1951 #else
1952 goto out_v4_not_compiled;
1953 #endif
1954
1955 nfs_set_port(sap, &args->nfs_server.port, 0);
1956
1957 nfs_set_mount_transport_protocol(args);
1958
1959 status = nfs_parse_devname(dev_name,
1960 &args->nfs_server.hostname,
1961 PAGE_SIZE,
1962 &args->nfs_server.export_path,
1963 NFS_MAXPATHLEN);
1964 if (!status)
1965 status = nfs_try_mount(args, mntfh);
1966
1967 kfree(args->nfs_server.export_path);
1968 args->nfs_server.export_path = NULL;
1969
1970 if (status)
1971 return status;
1972
1973 break;
1974 }
1975 }
1976
1977 #ifndef CONFIG_NFS_V3
1978 if (args->version == 3)
1979 goto out_v3_not_compiled;
1980 #endif /* !CONFIG_NFS_V3 */
1981
1982 return 0;
1983
1984 out_no_data:
1985 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1986 return -EINVAL;
1987
1988 out_no_v3:
1989 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1990 data->version);
1991 return -EINVAL;
1992
1993 out_no_sec:
1994 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1995 return -EINVAL;
1996
1997 #ifndef CONFIG_NFS_V3
1998 out_v3_not_compiled:
1999 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2000 return -EPROTONOSUPPORT;
2001 #endif /* !CONFIG_NFS_V3 */
2002
2003 #ifndef CONFIG_NFS_V4
2004 out_v4_not_compiled:
2005 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2006 return -EPROTONOSUPPORT;
2007 #endif /* !CONFIG_NFS_V4 */
2008
2009 out_nomem:
2010 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2011 return -ENOMEM;
2012
2013 out_no_address:
2014 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2015 return -EINVAL;
2016
2017 out_invalid_fh:
2018 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2019 return -EINVAL;
2020 }
2021
2022 static int
nfs_compare_remount_data(struct nfs_server * nfss,struct nfs_parsed_mount_data * data)2023 nfs_compare_remount_data(struct nfs_server *nfss,
2024 struct nfs_parsed_mount_data *data)
2025 {
2026 if (data->flags != nfss->flags ||
2027 data->rsize != nfss->rsize ||
2028 data->wsize != nfss->wsize ||
2029 data->retrans != nfss->client->cl_timeout->to_retries ||
2030 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2031 data->acregmin != nfss->acregmin / HZ ||
2032 data->acregmax != nfss->acregmax / HZ ||
2033 data->acdirmin != nfss->acdirmin / HZ ||
2034 data->acdirmax != nfss->acdirmax / HZ ||
2035 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2036 data->nfs_server.port != nfss->port ||
2037 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2038 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2039 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2040 return -EINVAL;
2041
2042 return 0;
2043 }
2044
2045 static int
nfs_remount(struct super_block * sb,int * flags,char * raw_data)2046 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2047 {
2048 int error;
2049 struct nfs_server *nfss = sb->s_fs_info;
2050 struct nfs_parsed_mount_data *data;
2051 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2052 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2053 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2054
2055 /*
2056 * Userspace mount programs that send binary options generally send
2057 * them populated with default values. We have no way to know which
2058 * ones were explicitly specified. Fall back to legacy behavior and
2059 * just return success.
2060 */
2061 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2062 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2063 options->version <= 6))))
2064 return 0;
2065
2066 data = kzalloc(sizeof(*data), GFP_KERNEL);
2067 if (data == NULL)
2068 return -ENOMEM;
2069
2070 /* fill out struct with values from existing mount */
2071 data->flags = nfss->flags;
2072 data->rsize = nfss->rsize;
2073 data->wsize = nfss->wsize;
2074 data->retrans = nfss->client->cl_timeout->to_retries;
2075 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2076 data->acregmin = nfss->acregmin / HZ;
2077 data->acregmax = nfss->acregmax / HZ;
2078 data->acdirmin = nfss->acdirmin / HZ;
2079 data->acdirmax = nfss->acdirmax / HZ;
2080 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2081 data->nfs_server.port = nfss->port;
2082 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2083 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2084 data->nfs_server.addrlen);
2085
2086 /* overwrite those values with any that were specified */
2087 error = nfs_parse_mount_options((char *)options, data);
2088 if (error < 0)
2089 goto out;
2090
2091 /*
2092 * noac is a special case. It implies -o sync, but that's not
2093 * necessarily reflected in the mtab options. do_remount_sb
2094 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2095 * remount options, so we have to explicitly reset it.
2096 */
2097 if (data->flags & NFS_MOUNT_NOAC)
2098 *flags |= MS_SYNCHRONOUS;
2099
2100 /* compare new mount options with old ones */
2101 error = nfs_compare_remount_data(nfss, data);
2102 out:
2103 kfree(data);
2104 return error;
2105 }
2106
2107 /*
2108 * Initialise the common bits of the superblock
2109 */
nfs_initialise_sb(struct super_block * sb)2110 static inline void nfs_initialise_sb(struct super_block *sb)
2111 {
2112 struct nfs_server *server = NFS_SB(sb);
2113
2114 sb->s_magic = NFS_SUPER_MAGIC;
2115
2116 /* We probably want something more informative here */
2117 snprintf(sb->s_id, sizeof(sb->s_id),
2118 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2119
2120 if (sb->s_blocksize == 0)
2121 sb->s_blocksize = nfs_block_bits(server->wsize,
2122 &sb->s_blocksize_bits);
2123
2124 sb->s_bdi = &server->backing_dev_info;
2125
2126 nfs_super_set_maxbytes(sb, server->maxfilesize);
2127 }
2128
2129 /*
2130 * Finish setting up an NFS2/3 superblock
2131 */
nfs_fill_super(struct super_block * sb,struct nfs_parsed_mount_data * data)2132 static void nfs_fill_super(struct super_block *sb,
2133 struct nfs_parsed_mount_data *data)
2134 {
2135 struct nfs_server *server = NFS_SB(sb);
2136
2137 sb->s_blocksize_bits = 0;
2138 sb->s_blocksize = 0;
2139 if (data->bsize)
2140 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2141
2142 if (server->nfs_client->rpc_ops->version == 3) {
2143 /* The VFS shouldn't apply the umask to mode bits. We will do
2144 * so ourselves when necessary.
2145 */
2146 sb->s_flags |= MS_POSIXACL;
2147 sb->s_time_gran = 1;
2148 }
2149
2150 sb->s_op = &nfs_sops;
2151 nfs_initialise_sb(sb);
2152 }
2153
2154 /*
2155 * Finish setting up a cloned NFS2/3 superblock
2156 */
nfs_clone_super(struct super_block * sb,const struct super_block * old_sb)2157 static void nfs_clone_super(struct super_block *sb,
2158 const struct super_block *old_sb)
2159 {
2160 struct nfs_server *server = NFS_SB(sb);
2161
2162 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2163 sb->s_blocksize = old_sb->s_blocksize;
2164 sb->s_maxbytes = old_sb->s_maxbytes;
2165
2166 if (server->nfs_client->rpc_ops->version == 3) {
2167 /* The VFS shouldn't apply the umask to mode bits. We will do
2168 * so ourselves when necessary.
2169 */
2170 sb->s_flags |= MS_POSIXACL;
2171 sb->s_time_gran = 1;
2172 }
2173
2174 sb->s_op = old_sb->s_op;
2175 nfs_initialise_sb(sb);
2176 }
2177
nfs_compare_mount_options(const struct super_block * s,const struct nfs_server * b,int flags)2178 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2179 {
2180 const struct nfs_server *a = s->s_fs_info;
2181 const struct rpc_clnt *clnt_a = a->client;
2182 const struct rpc_clnt *clnt_b = b->client;
2183
2184 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2185 goto Ebusy;
2186 if (a->nfs_client != b->nfs_client)
2187 goto Ebusy;
2188 if (a->flags != b->flags)
2189 goto Ebusy;
2190 if (a->wsize != b->wsize)
2191 goto Ebusy;
2192 if (a->rsize != b->rsize)
2193 goto Ebusy;
2194 if (a->acregmin != b->acregmin)
2195 goto Ebusy;
2196 if (a->acregmax != b->acregmax)
2197 goto Ebusy;
2198 if (a->acdirmin != b->acdirmin)
2199 goto Ebusy;
2200 if (a->acdirmax != b->acdirmax)
2201 goto Ebusy;
2202 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2203 goto Ebusy;
2204 return 1;
2205 Ebusy:
2206 return 0;
2207 }
2208
2209 struct nfs_sb_mountdata {
2210 struct nfs_server *server;
2211 int mntflags;
2212 };
2213
nfs_set_super(struct super_block * s,void * data)2214 static int nfs_set_super(struct super_block *s, void *data)
2215 {
2216 struct nfs_sb_mountdata *sb_mntdata = data;
2217 struct nfs_server *server = sb_mntdata->server;
2218 int ret;
2219
2220 s->s_flags = sb_mntdata->mntflags;
2221 s->s_fs_info = server;
2222 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2223 ret = set_anon_super(s, server);
2224 if (ret == 0)
2225 server->s_dev = s->s_dev;
2226 return ret;
2227 }
2228
nfs_compare_super_address(struct nfs_server * server1,struct nfs_server * server2)2229 static int nfs_compare_super_address(struct nfs_server *server1,
2230 struct nfs_server *server2)
2231 {
2232 struct sockaddr *sap1, *sap2;
2233
2234 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2235 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2236
2237 if (sap1->sa_family != sap2->sa_family)
2238 return 0;
2239
2240 switch (sap1->sa_family) {
2241 case AF_INET: {
2242 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2243 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2244 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2245 return 0;
2246 if (sin1->sin_port != sin2->sin_port)
2247 return 0;
2248 break;
2249 }
2250 case AF_INET6: {
2251 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2252 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2253 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2254 return 0;
2255 if (sin1->sin6_port != sin2->sin6_port)
2256 return 0;
2257 break;
2258 }
2259 default:
2260 return 0;
2261 }
2262
2263 return 1;
2264 }
2265
nfs_compare_super(struct super_block * sb,void * data)2266 static int nfs_compare_super(struct super_block *sb, void *data)
2267 {
2268 struct nfs_sb_mountdata *sb_mntdata = data;
2269 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2270 int mntflags = sb_mntdata->mntflags;
2271
2272 if (!nfs_compare_super_address(old, server))
2273 return 0;
2274 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2275 if (old->flags & NFS_MOUNT_UNSHARED)
2276 return 0;
2277 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2278 return 0;
2279 return nfs_compare_mount_options(sb, server, mntflags);
2280 }
2281
nfs_bdi_register(struct nfs_server * server)2282 static int nfs_bdi_register(struct nfs_server *server)
2283 {
2284 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2285 }
2286
nfs_fs_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2287 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2288 int flags, const char *dev_name, void *raw_data)
2289 {
2290 struct nfs_server *server = NULL;
2291 struct super_block *s;
2292 struct nfs_parsed_mount_data *data;
2293 struct nfs_fh *mntfh;
2294 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2295 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2296 struct nfs_sb_mountdata sb_mntdata = {
2297 .mntflags = flags,
2298 };
2299 int error;
2300
2301 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2302 mntfh = nfs_alloc_fhandle();
2303 if (data == NULL || mntfh == NULL)
2304 goto out;
2305
2306 /* Validate the mount data */
2307 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2308 if (error < 0) {
2309 mntroot = ERR_PTR(error);
2310 goto out;
2311 }
2312
2313 #ifdef CONFIG_NFS_V4
2314 if (data->version == 4) {
2315 mntroot = nfs4_try_mount(flags, dev_name, data);
2316 goto out;
2317 }
2318 #endif /* CONFIG_NFS_V4 */
2319
2320 /* Get a volume representation */
2321 server = nfs_create_server(data, mntfh);
2322 if (IS_ERR(server)) {
2323 mntroot = ERR_CAST(server);
2324 goto out;
2325 }
2326 sb_mntdata.server = server;
2327
2328 if (server->flags & NFS_MOUNT_UNSHARED)
2329 compare_super = NULL;
2330
2331 /* -o noac implies -o sync */
2332 if (server->flags & NFS_MOUNT_NOAC)
2333 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2334
2335 /* Get a superblock - note that we may end up sharing one that already exists */
2336 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2337 if (IS_ERR(s)) {
2338 mntroot = ERR_CAST(s);
2339 goto out_err_nosb;
2340 }
2341
2342 if (s->s_fs_info != server) {
2343 nfs_free_server(server);
2344 server = NULL;
2345 } else {
2346 error = nfs_bdi_register(server);
2347 if (error) {
2348 mntroot = ERR_PTR(error);
2349 goto error_splat_bdi;
2350 }
2351 }
2352
2353 if (!s->s_root) {
2354 /* initial superblock/root creation */
2355 nfs_fill_super(s, data);
2356 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2357 }
2358
2359 mntroot = nfs_get_root(s, mntfh, dev_name);
2360 if (IS_ERR(mntroot))
2361 goto error_splat_super;
2362
2363 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2364 if (error)
2365 goto error_splat_root;
2366
2367 s->s_flags |= MS_ACTIVE;
2368
2369 out:
2370 nfs_free_parsed_mount_data(data);
2371 nfs_free_fhandle(mntfh);
2372 return mntroot;
2373
2374 out_err_nosb:
2375 nfs_free_server(server);
2376 goto out;
2377
2378 error_splat_root:
2379 dput(mntroot);
2380 mntroot = ERR_PTR(error);
2381 error_splat_super:
2382 if (server && !s->s_root)
2383 bdi_unregister(&server->backing_dev_info);
2384 error_splat_bdi:
2385 deactivate_locked_super(s);
2386 goto out;
2387 }
2388
2389 /*
2390 * Ensure that we unregister the bdi before kill_anon_super
2391 * releases the device name
2392 */
nfs_put_super(struct super_block * s)2393 static void nfs_put_super(struct super_block *s)
2394 {
2395 struct nfs_server *server = NFS_SB(s);
2396
2397 bdi_unregister(&server->backing_dev_info);
2398 }
2399
2400 /*
2401 * Destroy an NFS2/3 superblock
2402 */
nfs_kill_super(struct super_block * s)2403 static void nfs_kill_super(struct super_block *s)
2404 {
2405 struct nfs_server *server = NFS_SB(s);
2406
2407 kill_anon_super(s);
2408 nfs_fscache_release_super_cookie(s);
2409 nfs_free_server(server);
2410 }
2411
2412 /*
2413 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2414 */
2415 static struct dentry *
nfs_xdev_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2416 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2417 const char *dev_name, void *raw_data)
2418 {
2419 struct nfs_clone_mount *data = raw_data;
2420 struct super_block *s;
2421 struct nfs_server *server;
2422 struct dentry *mntroot;
2423 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2424 struct nfs_sb_mountdata sb_mntdata = {
2425 .mntflags = flags,
2426 };
2427 int error;
2428
2429 dprintk("--> nfs_xdev_mount()\n");
2430
2431 /* create a new volume representation */
2432 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2433 if (IS_ERR(server)) {
2434 error = PTR_ERR(server);
2435 goto out_err_noserver;
2436 }
2437 sb_mntdata.server = server;
2438
2439 if (server->flags & NFS_MOUNT_UNSHARED)
2440 compare_super = NULL;
2441
2442 /* -o noac implies -o sync */
2443 if (server->flags & NFS_MOUNT_NOAC)
2444 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2445
2446 /* Get a superblock - note that we may end up sharing one that already exists */
2447 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2448 if (IS_ERR(s)) {
2449 error = PTR_ERR(s);
2450 goto out_err_nosb;
2451 }
2452
2453 if (s->s_fs_info != server) {
2454 nfs_free_server(server);
2455 server = NULL;
2456 } else {
2457 error = nfs_bdi_register(server);
2458 if (error)
2459 goto error_splat_bdi;
2460 }
2461
2462 if (!s->s_root) {
2463 /* initial superblock/root creation */
2464 nfs_clone_super(s, data->sb);
2465 nfs_fscache_get_super_cookie(s, NULL, data);
2466 }
2467
2468 mntroot = nfs_get_root(s, data->fh, dev_name);
2469 if (IS_ERR(mntroot)) {
2470 error = PTR_ERR(mntroot);
2471 goto error_splat_super;
2472 }
2473 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2474 dput(mntroot);
2475 error = -ESTALE;
2476 goto error_splat_super;
2477 }
2478
2479 s->s_flags |= MS_ACTIVE;
2480
2481 /* clone any lsm security options from the parent to the new sb */
2482 security_sb_clone_mnt_opts(data->sb, s);
2483
2484 dprintk("<-- nfs_xdev_mount() = 0\n");
2485 return mntroot;
2486
2487 out_err_nosb:
2488 nfs_free_server(server);
2489 out_err_noserver:
2490 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2491 return ERR_PTR(error);
2492
2493 error_splat_super:
2494 if (server && !s->s_root)
2495 bdi_unregister(&server->backing_dev_info);
2496 error_splat_bdi:
2497 deactivate_locked_super(s);
2498 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2499 return ERR_PTR(error);
2500 }
2501
2502 #ifdef CONFIG_NFS_V4
2503
2504 /*
2505 * Finish setting up a cloned NFS4 superblock
2506 */
nfs4_clone_super(struct super_block * sb,const struct super_block * old_sb)2507 static void nfs4_clone_super(struct super_block *sb,
2508 const struct super_block *old_sb)
2509 {
2510 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2511 sb->s_blocksize = old_sb->s_blocksize;
2512 sb->s_maxbytes = old_sb->s_maxbytes;
2513 sb->s_time_gran = 1;
2514 sb->s_op = old_sb->s_op;
2515 /*
2516 * The VFS shouldn't apply the umask to mode bits. We will do
2517 * so ourselves when necessary.
2518 */
2519 sb->s_flags |= MS_POSIXACL;
2520 sb->s_xattr = old_sb->s_xattr;
2521 nfs_initialise_sb(sb);
2522 }
2523
2524 /*
2525 * Set up an NFS4 superblock
2526 */
nfs4_fill_super(struct super_block * sb)2527 static void nfs4_fill_super(struct super_block *sb)
2528 {
2529 sb->s_time_gran = 1;
2530 sb->s_op = &nfs4_sops;
2531 /*
2532 * The VFS shouldn't apply the umask to mode bits. We will do
2533 * so ourselves when necessary.
2534 */
2535 sb->s_flags |= MS_POSIXACL;
2536 sb->s_xattr = nfs4_xattr_handlers;
2537 nfs_initialise_sb(sb);
2538 }
2539
nfs4_validate_mount_flags(struct nfs_parsed_mount_data * args)2540 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2541 {
2542 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2543 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2544 }
2545
nfs4_validate_text_mount_data(void * options,struct nfs_parsed_mount_data * args,const char * dev_name)2546 static int nfs4_validate_text_mount_data(void *options,
2547 struct nfs_parsed_mount_data *args,
2548 const char *dev_name)
2549 {
2550 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2551
2552 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2553
2554 nfs_validate_transport_protocol(args);
2555
2556 nfs4_validate_mount_flags(args);
2557
2558 if (args->version != 4) {
2559 dfprintk(MOUNT,
2560 "NFS4: Illegal mount version\n");
2561 return -EINVAL;
2562 }
2563
2564 if (args->auth_flavor_len > 1) {
2565 dfprintk(MOUNT,
2566 "NFS4: Too many RPC auth flavours specified\n");
2567 return -EINVAL;
2568 }
2569
2570 return nfs_parse_devname(dev_name,
2571 &args->nfs_server.hostname,
2572 NFS4_MAXNAMLEN,
2573 &args->nfs_server.export_path,
2574 NFS4_MAXPATHLEN);
2575 }
2576
2577 /*
2578 * Validate NFSv4 mount options
2579 */
nfs4_validate_mount_data(void * options,struct nfs_parsed_mount_data * args,const char * dev_name)2580 static int nfs4_validate_mount_data(void *options,
2581 struct nfs_parsed_mount_data *args,
2582 const char *dev_name)
2583 {
2584 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2585 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2586 char *c;
2587
2588 if (data == NULL)
2589 goto out_no_data;
2590
2591 switch (data->version) {
2592 case 1:
2593 if (data->host_addrlen > sizeof(args->nfs_server.address))
2594 goto out_no_address;
2595 if (data->host_addrlen == 0)
2596 goto out_no_address;
2597 args->nfs_server.addrlen = data->host_addrlen;
2598 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2599 return -EFAULT;
2600 if (!nfs_verify_server_address(sap))
2601 goto out_no_address;
2602 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2603
2604 if (data->auth_flavourlen) {
2605 if (data->auth_flavourlen > 1)
2606 goto out_inval_auth;
2607 if (copy_from_user(&args->auth_flavors[0],
2608 data->auth_flavours,
2609 sizeof(args->auth_flavors[0])))
2610 return -EFAULT;
2611 }
2612
2613 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2614 if (IS_ERR(c))
2615 return PTR_ERR(c);
2616 args->nfs_server.hostname = c;
2617
2618 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2619 if (IS_ERR(c))
2620 return PTR_ERR(c);
2621 args->nfs_server.export_path = c;
2622 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2623
2624 c = strndup_user(data->client_addr.data, 16);
2625 if (IS_ERR(c))
2626 return PTR_ERR(c);
2627 args->client_address = c;
2628
2629 /*
2630 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2631 * can deal with.
2632 */
2633
2634 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2635 args->rsize = data->rsize;
2636 args->wsize = data->wsize;
2637 args->timeo = data->timeo;
2638 args->retrans = data->retrans;
2639 args->acregmin = data->acregmin;
2640 args->acregmax = data->acregmax;
2641 args->acdirmin = data->acdirmin;
2642 args->acdirmax = data->acdirmax;
2643 args->nfs_server.protocol = data->proto;
2644 nfs_validate_transport_protocol(args);
2645
2646 break;
2647 default:
2648 if (nfs_parse_mount_options((char *)options, args) == 0)
2649 return -EINVAL;
2650
2651 if (!nfs_verify_server_address(sap))
2652 return -EINVAL;
2653
2654 return nfs4_validate_text_mount_data(options, args, dev_name);
2655 }
2656
2657 return 0;
2658
2659 out_no_data:
2660 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2661 return -EINVAL;
2662
2663 out_inval_auth:
2664 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2665 data->auth_flavourlen);
2666 return -EINVAL;
2667
2668 out_no_address:
2669 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2670 return -EINVAL;
2671 }
2672
2673 /*
2674 * Get the superblock for the NFS4 root partition
2675 */
2676 static struct dentry *
nfs4_remote_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2677 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2678 const char *dev_name, void *raw_data)
2679 {
2680 struct nfs_parsed_mount_data *data = raw_data;
2681 struct super_block *s;
2682 struct nfs_server *server;
2683 struct nfs_fh *mntfh;
2684 struct dentry *mntroot;
2685 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2686 struct nfs_sb_mountdata sb_mntdata = {
2687 .mntflags = flags,
2688 };
2689 int error = -ENOMEM;
2690
2691 mntfh = nfs_alloc_fhandle();
2692 if (data == NULL || mntfh == NULL)
2693 goto out;
2694
2695 /* Get a volume representation */
2696 server = nfs4_create_server(data, mntfh);
2697 if (IS_ERR(server)) {
2698 error = PTR_ERR(server);
2699 goto out;
2700 }
2701 sb_mntdata.server = server;
2702
2703 if (server->flags & NFS4_MOUNT_UNSHARED)
2704 compare_super = NULL;
2705
2706 /* -o noac implies -o sync */
2707 if (server->flags & NFS_MOUNT_NOAC)
2708 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2709
2710 /* Get a superblock - note that we may end up sharing one that already exists */
2711 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2712 if (IS_ERR(s)) {
2713 error = PTR_ERR(s);
2714 goto out_free;
2715 }
2716
2717 if (s->s_fs_info != server) {
2718 nfs_free_server(server);
2719 server = NULL;
2720 } else {
2721 error = nfs_bdi_register(server);
2722 if (error)
2723 goto error_splat_bdi;
2724 }
2725
2726 if (!s->s_root) {
2727 /* initial superblock/root creation */
2728 nfs4_fill_super(s);
2729 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2730 }
2731
2732 mntroot = nfs4_get_root(s, mntfh, dev_name);
2733 if (IS_ERR(mntroot)) {
2734 error = PTR_ERR(mntroot);
2735 goto error_splat_super;
2736 }
2737
2738 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2739 if (error)
2740 goto error_splat_root;
2741
2742 s->s_flags |= MS_ACTIVE;
2743
2744 nfs_free_fhandle(mntfh);
2745 return mntroot;
2746
2747 out:
2748 nfs_free_fhandle(mntfh);
2749 return ERR_PTR(error);
2750
2751 out_free:
2752 nfs_free_server(server);
2753 goto out;
2754
2755 error_splat_root:
2756 dput(mntroot);
2757 error_splat_super:
2758 if (server && !s->s_root)
2759 bdi_unregister(&server->backing_dev_info);
2760 error_splat_bdi:
2761 deactivate_locked_super(s);
2762 goto out;
2763 }
2764
nfs_do_root_mount(struct file_system_type * fs_type,int flags,void * data,const char * hostname)2765 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2766 int flags, void *data, const char *hostname)
2767 {
2768 struct vfsmount *root_mnt;
2769 char *root_devname;
2770 size_t len;
2771
2772 len = strlen(hostname) + 5;
2773 root_devname = kmalloc(len, GFP_KERNEL);
2774 if (root_devname == NULL)
2775 return ERR_PTR(-ENOMEM);
2776 /* Does hostname needs to be enclosed in brackets? */
2777 if (strchr(hostname, ':'))
2778 snprintf(root_devname, len, "[%s]:/", hostname);
2779 else
2780 snprintf(root_devname, len, "%s:/", hostname);
2781 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2782 kfree(root_devname);
2783 return root_mnt;
2784 }
2785
2786 struct nfs_referral_count {
2787 struct list_head list;
2788 const struct task_struct *task;
2789 unsigned int referral_count;
2790 };
2791
2792 static LIST_HEAD(nfs_referral_count_list);
2793 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2794
nfs_find_referral_count(void)2795 static struct nfs_referral_count *nfs_find_referral_count(void)
2796 {
2797 struct nfs_referral_count *p;
2798
2799 list_for_each_entry(p, &nfs_referral_count_list, list) {
2800 if (p->task == current)
2801 return p;
2802 }
2803 return NULL;
2804 }
2805
2806 #define NFS_MAX_NESTED_REFERRALS 2
2807
nfs_referral_loop_protect(void)2808 static int nfs_referral_loop_protect(void)
2809 {
2810 struct nfs_referral_count *p, *new;
2811 int ret = -ENOMEM;
2812
2813 new = kmalloc(sizeof(*new), GFP_KERNEL);
2814 if (!new)
2815 goto out;
2816 new->task = current;
2817 new->referral_count = 1;
2818
2819 ret = 0;
2820 spin_lock(&nfs_referral_count_list_lock);
2821 p = nfs_find_referral_count();
2822 if (p != NULL) {
2823 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2824 ret = -ELOOP;
2825 else
2826 p->referral_count++;
2827 } else {
2828 list_add(&new->list, &nfs_referral_count_list);
2829 new = NULL;
2830 }
2831 spin_unlock(&nfs_referral_count_list_lock);
2832 kfree(new);
2833 out:
2834 return ret;
2835 }
2836
nfs_referral_loop_unprotect(void)2837 static void nfs_referral_loop_unprotect(void)
2838 {
2839 struct nfs_referral_count *p;
2840
2841 spin_lock(&nfs_referral_count_list_lock);
2842 p = nfs_find_referral_count();
2843 p->referral_count--;
2844 if (p->referral_count == 0)
2845 list_del(&p->list);
2846 else
2847 p = NULL;
2848 spin_unlock(&nfs_referral_count_list_lock);
2849 kfree(p);
2850 }
2851
nfs_follow_remote_path(struct vfsmount * root_mnt,const char * export_path)2852 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2853 const char *export_path)
2854 {
2855 struct dentry *dentry;
2856 int err;
2857
2858 if (IS_ERR(root_mnt))
2859 return ERR_CAST(root_mnt);
2860
2861 err = nfs_referral_loop_protect();
2862 if (err) {
2863 mntput(root_mnt);
2864 return ERR_PTR(err);
2865 }
2866
2867 dentry = mount_subtree(root_mnt, export_path);
2868 nfs_referral_loop_unprotect();
2869
2870 return dentry;
2871 }
2872
nfs4_try_mount(int flags,const char * dev_name,struct nfs_parsed_mount_data * data)2873 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2874 struct nfs_parsed_mount_data *data)
2875 {
2876 char *export_path;
2877 struct vfsmount *root_mnt;
2878 struct dentry *res;
2879
2880 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2881
2882 export_path = data->nfs_server.export_path;
2883 data->nfs_server.export_path = "/";
2884 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2885 data->nfs_server.hostname);
2886 data->nfs_server.export_path = export_path;
2887
2888 res = nfs_follow_remote_path(root_mnt, export_path);
2889
2890 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2891 IS_ERR(res) ? PTR_ERR(res) : 0,
2892 IS_ERR(res) ? " [error]" : "");
2893 return res;
2894 }
2895
2896 /*
2897 * Get the superblock for an NFS4 mountpoint
2898 */
nfs4_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2899 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2900 int flags, const char *dev_name, void *raw_data)
2901 {
2902 struct nfs_parsed_mount_data *data;
2903 int error = -ENOMEM;
2904 struct dentry *res = ERR_PTR(-ENOMEM);
2905
2906 data = nfs_alloc_parsed_mount_data(4);
2907 if (data == NULL)
2908 goto out;
2909
2910 /* Validate the mount data */
2911 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2912 if (error < 0) {
2913 res = ERR_PTR(error);
2914 goto out;
2915 }
2916
2917 res = nfs4_try_mount(flags, dev_name, data);
2918 if (IS_ERR(res))
2919 error = PTR_ERR(res);
2920
2921 out:
2922 nfs_free_parsed_mount_data(data);
2923 dprintk("<-- nfs4_mount() = %d%s\n", error,
2924 error != 0 ? " [error]" : "");
2925 return res;
2926 }
2927
nfs4_kill_super(struct super_block * sb)2928 static void nfs4_kill_super(struct super_block *sb)
2929 {
2930 struct nfs_server *server = NFS_SB(sb);
2931
2932 dprintk("--> %s\n", __func__);
2933 nfs_super_return_all_delegations(sb);
2934 kill_anon_super(sb);
2935 nfs_fscache_release_super_cookie(sb);
2936 nfs_free_server(server);
2937 dprintk("<-- %s\n", __func__);
2938 }
2939
2940 /*
2941 * Clone an NFS4 server record on xdev traversal (FSID-change)
2942 */
2943 static struct dentry *
nfs4_xdev_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)2944 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2945 const char *dev_name, void *raw_data)
2946 {
2947 struct nfs_clone_mount *data = raw_data;
2948 struct super_block *s;
2949 struct nfs_server *server;
2950 struct dentry *mntroot;
2951 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2952 struct nfs_sb_mountdata sb_mntdata = {
2953 .mntflags = flags,
2954 };
2955 int error;
2956
2957 dprintk("--> nfs4_xdev_mount()\n");
2958
2959 /* create a new volume representation */
2960 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2961 if (IS_ERR(server)) {
2962 error = PTR_ERR(server);
2963 goto out_err_noserver;
2964 }
2965 sb_mntdata.server = server;
2966
2967 if (server->flags & NFS4_MOUNT_UNSHARED)
2968 compare_super = NULL;
2969
2970 /* -o noac implies -o sync */
2971 if (server->flags & NFS_MOUNT_NOAC)
2972 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2973
2974 /* Get a superblock - note that we may end up sharing one that already exists */
2975 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2976 if (IS_ERR(s)) {
2977 error = PTR_ERR(s);
2978 goto out_err_nosb;
2979 }
2980
2981 if (s->s_fs_info != server) {
2982 nfs_free_server(server);
2983 server = NULL;
2984 } else {
2985 error = nfs_bdi_register(server);
2986 if (error)
2987 goto error_splat_bdi;
2988 }
2989
2990 if (!s->s_root) {
2991 /* initial superblock/root creation */
2992 nfs4_clone_super(s, data->sb);
2993 nfs_fscache_get_super_cookie(s, NULL, data);
2994 }
2995
2996 mntroot = nfs4_get_root(s, data->fh, dev_name);
2997 if (IS_ERR(mntroot)) {
2998 error = PTR_ERR(mntroot);
2999 goto error_splat_super;
3000 }
3001 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3002 dput(mntroot);
3003 error = -ESTALE;
3004 goto error_splat_super;
3005 }
3006
3007 s->s_flags |= MS_ACTIVE;
3008
3009 security_sb_clone_mnt_opts(data->sb, s);
3010
3011 dprintk("<-- nfs4_xdev_mount() = 0\n");
3012 return mntroot;
3013
3014 out_err_nosb:
3015 nfs_free_server(server);
3016 out_err_noserver:
3017 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3018 return ERR_PTR(error);
3019
3020 error_splat_super:
3021 if (server && !s->s_root)
3022 bdi_unregister(&server->backing_dev_info);
3023 error_splat_bdi:
3024 deactivate_locked_super(s);
3025 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3026 return ERR_PTR(error);
3027 }
3028
3029 static struct dentry *
nfs4_remote_referral_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)3030 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3031 const char *dev_name, void *raw_data)
3032 {
3033 struct nfs_clone_mount *data = raw_data;
3034 struct super_block *s;
3035 struct nfs_server *server;
3036 struct dentry *mntroot;
3037 struct nfs_fh *mntfh;
3038 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3039 struct nfs_sb_mountdata sb_mntdata = {
3040 .mntflags = flags,
3041 };
3042 int error = -ENOMEM;
3043
3044 dprintk("--> nfs4_referral_get_sb()\n");
3045
3046 mntfh = nfs_alloc_fhandle();
3047 if (mntfh == NULL)
3048 goto out_err_nofh;
3049
3050 /* create a new volume representation */
3051 server = nfs4_create_referral_server(data, mntfh);
3052 if (IS_ERR(server)) {
3053 error = PTR_ERR(server);
3054 goto out_err_noserver;
3055 }
3056 sb_mntdata.server = server;
3057
3058 if (server->flags & NFS4_MOUNT_UNSHARED)
3059 compare_super = NULL;
3060
3061 /* -o noac implies -o sync */
3062 if (server->flags & NFS_MOUNT_NOAC)
3063 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3064
3065 /* Get a superblock - note that we may end up sharing one that already exists */
3066 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3067 if (IS_ERR(s)) {
3068 error = PTR_ERR(s);
3069 goto out_err_nosb;
3070 }
3071
3072 if (s->s_fs_info != server) {
3073 nfs_free_server(server);
3074 server = NULL;
3075 } else {
3076 error = nfs_bdi_register(server);
3077 if (error)
3078 goto error_splat_bdi;
3079 }
3080
3081 if (!s->s_root) {
3082 /* initial superblock/root creation */
3083 nfs4_fill_super(s);
3084 nfs_fscache_get_super_cookie(s, NULL, data);
3085 }
3086
3087 mntroot = nfs4_get_root(s, mntfh, dev_name);
3088 if (IS_ERR(mntroot)) {
3089 error = PTR_ERR(mntroot);
3090 goto error_splat_super;
3091 }
3092 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3093 dput(mntroot);
3094 error = -ESTALE;
3095 goto error_splat_super;
3096 }
3097
3098 s->s_flags |= MS_ACTIVE;
3099
3100 security_sb_clone_mnt_opts(data->sb, s);
3101
3102 nfs_free_fhandle(mntfh);
3103 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3104 return mntroot;
3105
3106 out_err_nosb:
3107 nfs_free_server(server);
3108 out_err_noserver:
3109 nfs_free_fhandle(mntfh);
3110 out_err_nofh:
3111 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3112 return ERR_PTR(error);
3113
3114 error_splat_super:
3115 if (server && !s->s_root)
3116 bdi_unregister(&server->backing_dev_info);
3117 error_splat_bdi:
3118 deactivate_locked_super(s);
3119 nfs_free_fhandle(mntfh);
3120 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3121 return ERR_PTR(error);
3122 }
3123
3124 /*
3125 * Create an NFS4 server record on referral traversal
3126 */
nfs4_referral_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * raw_data)3127 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3128 int flags, const char *dev_name, void *raw_data)
3129 {
3130 struct nfs_clone_mount *data = raw_data;
3131 char *export_path;
3132 struct vfsmount *root_mnt;
3133 struct dentry *res;
3134
3135 dprintk("--> nfs4_referral_mount()\n");
3136
3137 export_path = data->mnt_path;
3138 data->mnt_path = "/";
3139
3140 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3141 flags, data, data->hostname);
3142 data->mnt_path = export_path;
3143
3144 res = nfs_follow_remote_path(root_mnt, export_path);
3145 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3146 IS_ERR(res) ? PTR_ERR(res) : 0,
3147 IS_ERR(res) ? " [error]" : "");
3148 return res;
3149 }
3150
3151 MODULE_ALIAS("nfs4");
3152
3153 #endif /* CONFIG_NFS_V4 */
3154