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Linux 3.2.93
[linux/fpc-iii.git] / fs / nfs / super.c
blob19438987bbe418294568eeaf1ad7a12c08ebcd14
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/mnt_namespace.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 #ifdef CONFIG_NFS_V3
71 #define NFS_DEFAULT_VERSION 3
72 #else
73 #define NFS_DEFAULT_VERSION 2
74 #endif
75
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_v2, Opt_v3, Opt_v4,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_nfsvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115 };
116
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
138 { Opt_v4, "v4" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152
153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
176 { Opt_mounthost, "mounthost=%s" },
177 { Opt_mountaddr, "mountaddr=%s" },
178
179 { Opt_lookupcache, "lookupcache=%s" },
180 { Opt_fscache_uniq, "fsc=%s" },
181 { Opt_local_lock, "local_lock=%s" },
182
183 { Opt_err, NULL }
184 };
185
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
264 static void nfs_umount_begin(struct super_block *);
265 static int nfs_statfs(struct dentry *, struct kstatfs *);
266 static int nfs_show_options(struct seq_file *, struct vfsmount *);
267 static int nfs_show_devname(struct seq_file *, struct vfsmount *);
268 static int nfs_show_path(struct seq_file *, struct vfsmount *);
269 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
270 static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
272 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
274 static void nfs_put_super(struct super_block *);
275 static void nfs_kill_super(struct super_block *);
276 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
277
278 static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
281 .mount = nfs_fs_mount,
282 .kill_sb = nfs_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
284 };
285
286 struct file_system_type nfs_xdev_fs_type = {
287 .owner = THIS_MODULE,
288 .name = "nfs",
289 .mount = nfs_xdev_mount,
290 .kill_sb = nfs_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
292 };
293
294 static const struct super_operations nfs_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .put_super = nfs_put_super,
299 .statfs = nfs_statfs,
300 .evict_inode = nfs_evict_inode,
301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
305 .show_stats = nfs_show_stats,
306 .remount_fs = nfs_remount,
307 };
308
309 #ifdef CONFIG_NFS_V4
310 static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
312 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
322 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
324 static void nfs4_kill_super(struct super_block *sb);
325
326 static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .mount = nfs4_mount,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332 };
333
334 static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
337 .mount = nfs4_remote_mount,
338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340 };
341
342 struct file_system_type nfs4_xdev_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_xdev_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348 };
349
350 static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_referral_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356 };
357
358 struct file_system_type nfs4_referral_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_referral_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364 };
365
366 static const struct super_operations nfs4_sops = {
367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
370 .put_super = nfs_put_super,
371 .statfs = nfs_statfs,
372 .evict_inode = nfs4_evict_inode,
373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
377 .show_stats = nfs_show_stats,
378 .remount_fs = nfs_remount,
379 };
380 #endif
381
382 static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385 };
386
387 /*
388 * Register the NFS filesystems
389 */
390 int __init register_nfs_fs(void)
391 {
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
401 #ifdef CONFIG_NFS_V4
402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405 #endif
406 register_shrinker(&acl_shrinker);
407 return 0;
408
409 #ifdef CONFIG_NFS_V4
410 error_2:
411 nfs_unregister_sysctl();
412 #endif
413 error_1:
414 unregister_filesystem(&nfs_fs_type);
415 error_0:
416 return ret;
417 }
418
419 /*
420 * Unregister the NFS filesystems
421 */
422 void __exit unregister_nfs_fs(void)
423 {
424 unregister_shrinker(&acl_shrinker);
425 #ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
427 #endif
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type);
430 }
431
432 void nfs_sb_active(struct super_block *sb)
433 {
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
438 }
439
440 void nfs_sb_deactive(struct super_block *sb)
441 {
442 struct nfs_server *server = NFS_SB(sb);
443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
446 }
447
448 /*
449 * Deliver file system statistics to userspace
450 */
451 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
452 {
453 struct nfs_server *server = NFS_SB(dentry->d_sb);
454 unsigned char blockbits;
455 unsigned long blockres;
456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
463
464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
474 nfs_free_fattr(res.fattr);
475 if (error < 0)
476 goto out_err;
477
478 buf->f_type = NFS_SUPER_MAGIC;
479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
485 buf->f_frsize = dentry->d_sb->s_blocksize;
486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
505
506 return 0;
507
508 out_err:
509 dprintk("%s: statfs error = %d\n", __func__, -error);
510 return error;
511 }
512
513 /*
514 * Map the security flavour number to a name
515 */
516 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517 {
518 static const struct {
519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
533 { UINT_MAX, "unknown" }
534 };
535 int i;
536
537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542 }
543
544 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581 }
582
583 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585 {
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
614 nfs_show_mountd_netid(m, nfss, showdefaults);
615 }
616
617 #ifdef CONFIG_NFS_V4
618 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620 {
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625 }
626 #else
627 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629 {
630 }
631 #endif
632
633 /*
634 * Describe the mount options in force on this server representation
635 */
636 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
638 {
639 static const struct proc_nfs_info {
640 int flag;
641 const char *str;
642 const char *nostr;
643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX, ",posix", "" },
646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
653 { 0, NULL, NULL }
654 };
655 const struct proc_nfs_info *nfs_infop;
656 struct nfs_client *clp = nfss->nfs_client;
657 u32 version = clp->rpc_ops->version;
658 int local_flock, local_fcntl;
659
660 seq_printf(m, ",vers=%u", version);
661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
680 seq_printf(m, ",proto=%s",
681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
719 }
720
721 /*
722 * Describe the mount options on this VFS mountpoint
723 */
724 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
725 {
726 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
727
728 nfs_show_mount_options(m, nfss, 0);
729
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733
734 return 0;
735 }
736
737 #ifdef CONFIG_NFS_V4
738 #ifdef CONFIG_NFS_V4_1
739 static void show_sessions(struct seq_file *m, struct nfs_server *server)
740 {
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743 }
744 #else
745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746 #endif
747 #endif
748
749 #ifdef CONFIG_NFS_V4
750 #ifdef CONFIG_NFS_V4_1
751 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
752 {
753 seq_printf(m, ",pnfs=");
754 if (server->pnfs_curr_ld)
755 seq_printf(m, "%s", server->pnfs_curr_ld->name);
756 else
757 seq_printf(m, "not configured");
758 }
759 #else
760 static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
761 #endif
762 #endif
763
764 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
765 {
766 char *page = (char *) __get_free_page(GFP_KERNEL);
767 char *devname, *dummy;
768 int err = 0;
769 if (!page)
770 return -ENOMEM;
771 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE, 0);
772 if (IS_ERR(devname))
773 err = PTR_ERR(devname);
774 else
775 seq_escape(m, devname, " \t\n\\");
776 free_page((unsigned long)page);
777 return err;
778 }
779
780 static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
781 {
782 seq_puts(m, "/");
783 return 0;
784 }
785
786 /*
787 * Present statistical information for this VFS mountpoint
788 */
789 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
790 {
791 int i, cpu;
792 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
793 struct rpc_auth *auth = nfss->client->cl_auth;
794 struct nfs_iostats totals = { };
795
796 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
797
798 /*
799 * Display all mount option settings
800 */
801 seq_printf(m, "\n\topts:\t");
802 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
803 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
804 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
805 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
806 nfs_show_mount_options(m, nfss, 1);
807
808 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
809
810 seq_printf(m, "\n\tcaps:\t");
811 seq_printf(m, "caps=0x%x", nfss->caps);
812 seq_printf(m, ",wtmult=%u", nfss->wtmult);
813 seq_printf(m, ",dtsize=%u", nfss->dtsize);
814 seq_printf(m, ",bsize=%u", nfss->bsize);
815 seq_printf(m, ",namlen=%u", nfss->namelen);
816
817 #ifdef CONFIG_NFS_V4
818 if (nfss->nfs_client->rpc_ops->version == 4) {
819 seq_printf(m, "\n\tnfsv4:\t");
820 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
821 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
822 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
823 show_sessions(m, nfss);
824 show_pnfs(m, nfss);
825 }
826 #endif
827
828 /*
829 * Display security flavor in effect for this mount
830 */
831 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
832 if (auth->au_flavor)
833 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
834
835 /*
836 * Display superblock I/O counters
837 */
838 for_each_possible_cpu(cpu) {
839 struct nfs_iostats *stats;
840
841 preempt_disable();
842 stats = per_cpu_ptr(nfss->io_stats, cpu);
843
844 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
845 totals.events[i] += stats->events[i];
846 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
847 totals.bytes[i] += stats->bytes[i];
848 #ifdef CONFIG_NFS_FSCACHE
849 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
850 totals.fscache[i] += stats->fscache[i];
851 #endif
852
853 preempt_enable();
854 }
855
856 seq_printf(m, "\n\tevents:\t");
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 seq_printf(m, "%lu ", totals.events[i]);
859 seq_printf(m, "\n\tbytes:\t");
860 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
862 #ifdef CONFIG_NFS_FSCACHE
863 if (nfss->options & NFS_OPTION_FSCACHE) {
864 seq_printf(m, "\n\tfsc:\t");
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 seq_printf(m, "%Lu ", totals.bytes[i]);
867 }
868 #endif
869 seq_printf(m, "\n");
870
871 rpc_print_iostats(m, nfss->client);
872
873 return 0;
874 }
875
876 /*
877 * Begin unmount by attempting to remove all automounted mountpoints we added
878 * in response to xdev traversals and referrals
879 */
880 static void nfs_umount_begin(struct super_block *sb)
881 {
882 struct nfs_server *server;
883 struct rpc_clnt *rpc;
884
885 server = NFS_SB(sb);
886 /* -EIO all pending I/O */
887 rpc = server->client_acl;
888 if (!IS_ERR(rpc))
889 rpc_killall_tasks(rpc);
890 rpc = server->client;
891 if (!IS_ERR(rpc))
892 rpc_killall_tasks(rpc);
893 }
894
895 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
896 {
897 struct nfs_parsed_mount_data *data;
898
899 data = kzalloc(sizeof(*data), GFP_KERNEL);
900 if (data) {
901 data->acregmin = NFS_DEF_ACREGMIN;
902 data->acregmax = NFS_DEF_ACREGMAX;
903 data->acdirmin = NFS_DEF_ACDIRMIN;
904 data->acdirmax = NFS_DEF_ACDIRMAX;
905 data->mount_server.port = NFS_UNSPEC_PORT;
906 data->nfs_server.port = NFS_UNSPEC_PORT;
907 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
908 data->auth_flavors[0] = RPC_AUTH_UNIX;
909 data->auth_flavor_len = 1;
910 data->version = version;
911 data->minorversion = 0;
912 security_init_mnt_opts(&data->lsm_opts);
913 }
914 return data;
915 }
916
917 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
918 {
919 if (data) {
920 kfree(data->client_address);
921 kfree(data->mount_server.hostname);
922 kfree(data->nfs_server.export_path);
923 kfree(data->nfs_server.hostname);
924 kfree(data->fscache_uniq);
925 security_free_mnt_opts(&data->lsm_opts);
926 kfree(data);
927 }
928 }
929
930 /*
931 * Sanity-check a server address provided by the mount command.
932 *
933 * Address family must be initialized, and address must not be
934 * the ANY address for that family.
935 */
936 static int nfs_verify_server_address(struct sockaddr *addr)
937 {
938 switch (addr->sa_family) {
939 case AF_INET: {
940 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
941 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
942 }
943 case AF_INET6: {
944 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
945 return !ipv6_addr_any(sa);
946 }
947 }
948
949 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
950 return 0;
951 }
952
953 /*
954 * Select between a default port value and a user-specified port value.
955 * If a zero value is set, then autobind will be used.
956 */
957 static void nfs_set_port(struct sockaddr *sap, int *port,
958 const unsigned short default_port)
959 {
960 if (*port == NFS_UNSPEC_PORT)
961 *port = default_port;
962
963 rpc_set_port(sap, *port);
964 }
965
966 /*
967 * Sanity check the NFS transport protocol.
968 *
969 */
970 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
971 {
972 switch (mnt->nfs_server.protocol) {
973 case XPRT_TRANSPORT_UDP:
974 case XPRT_TRANSPORT_TCP:
975 case XPRT_TRANSPORT_RDMA:
976 break;
977 default:
978 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
979 }
980 }
981
982 /*
983 * For text based NFSv2/v3 mounts, the mount protocol transport default
984 * settings should depend upon the specified NFS transport.
985 */
986 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
987 {
988 nfs_validate_transport_protocol(mnt);
989
990 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
991 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
992 return;
993 switch (mnt->nfs_server.protocol) {
994 case XPRT_TRANSPORT_UDP:
995 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
996 break;
997 case XPRT_TRANSPORT_TCP:
998 case XPRT_TRANSPORT_RDMA:
999 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1000 }
1001 }
1002
1003 /*
1004 * Parse the value of the 'sec=' option.
1005 */
1006 static int nfs_parse_security_flavors(char *value,
1007 struct nfs_parsed_mount_data *mnt)
1008 {
1009 substring_t args[MAX_OPT_ARGS];
1010
1011 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1012
1013 switch (match_token(value, nfs_secflavor_tokens, args)) {
1014 case Opt_sec_none:
1015 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1016 break;
1017 case Opt_sec_sys:
1018 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1019 break;
1020 case Opt_sec_krb5:
1021 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1022 break;
1023 case Opt_sec_krb5i:
1024 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1025 break;
1026 case Opt_sec_krb5p:
1027 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1028 break;
1029 case Opt_sec_lkey:
1030 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1031 break;
1032 case Opt_sec_lkeyi:
1033 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1034 break;
1035 case Opt_sec_lkeyp:
1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1037 break;
1038 case Opt_sec_spkm:
1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1040 break;
1041 case Opt_sec_spkmi:
1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1043 break;
1044 case Opt_sec_spkmp:
1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1046 break;
1047 default:
1048 return 0;
1049 }
1050
1051 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1052 mnt->auth_flavor_len = 1;
1053 return 1;
1054 }
1055
1056 static int nfs_get_option_str(substring_t args[], char **option)
1057 {
1058 kfree(*option);
1059 *option = match_strdup(args);
1060 return !*option;
1061 }
1062
1063 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1064 {
1065 int rc;
1066 char *string;
1067
1068 string = match_strdup(args);
1069 if (string == NULL)
1070 return -ENOMEM;
1071 rc = strict_strtoul(string, 10, option);
1072 kfree(string);
1073
1074 return rc;
1075 }
1076
1077 /*
1078 * Error-check and convert a string of mount options from user space into
1079 * a data structure. The whole mount string is processed; bad options are
1080 * skipped as they are encountered. If there were no errors, return 1;
1081 * otherwise return 0 (zero).
1082 */
1083 static int nfs_parse_mount_options(char *raw,
1084 struct nfs_parsed_mount_data *mnt)
1085 {
1086 char *p, *string, *secdata;
1087 int rc, sloppy = 0, invalid_option = 0;
1088 unsigned short protofamily = AF_UNSPEC;
1089 unsigned short mountfamily = AF_UNSPEC;
1090
1091 if (!raw) {
1092 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1093 return 1;
1094 }
1095 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1096
1097 secdata = alloc_secdata();
1098 if (!secdata)
1099 goto out_nomem;
1100
1101 rc = security_sb_copy_data(raw, secdata);
1102 if (rc)
1103 goto out_security_failure;
1104
1105 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1106 if (rc)
1107 goto out_security_failure;
1108
1109 free_secdata(secdata);
1110
1111 while ((p = strsep(&raw, ",")) != NULL) {
1112 substring_t args[MAX_OPT_ARGS];
1113 unsigned long option;
1114 int token;
1115
1116 if (!*p)
1117 continue;
1118
1119 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1120
1121 token = match_token(p, nfs_mount_option_tokens, args);
1122 switch (token) {
1123
1124 /*
1125 * boolean options: foo/nofoo
1126 */
1127 case Opt_soft:
1128 mnt->flags |= NFS_MOUNT_SOFT;
1129 break;
1130 case Opt_hard:
1131 mnt->flags &= ~NFS_MOUNT_SOFT;
1132 break;
1133 case Opt_posix:
1134 mnt->flags |= NFS_MOUNT_POSIX;
1135 break;
1136 case Opt_noposix:
1137 mnt->flags &= ~NFS_MOUNT_POSIX;
1138 break;
1139 case Opt_cto:
1140 mnt->flags &= ~NFS_MOUNT_NOCTO;
1141 break;
1142 case Opt_nocto:
1143 mnt->flags |= NFS_MOUNT_NOCTO;
1144 break;
1145 case Opt_ac:
1146 mnt->flags &= ~NFS_MOUNT_NOAC;
1147 break;
1148 case Opt_noac:
1149 mnt->flags |= NFS_MOUNT_NOAC;
1150 break;
1151 case Opt_lock:
1152 mnt->flags &= ~NFS_MOUNT_NONLM;
1153 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1154 NFS_MOUNT_LOCAL_FCNTL);
1155 break;
1156 case Opt_nolock:
1157 mnt->flags |= NFS_MOUNT_NONLM;
1158 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1159 NFS_MOUNT_LOCAL_FCNTL);
1160 break;
1161 case Opt_v2:
1162 mnt->flags &= ~NFS_MOUNT_VER3;
1163 mnt->version = 2;
1164 break;
1165 case Opt_v3:
1166 mnt->flags |= NFS_MOUNT_VER3;
1167 mnt->version = 3;
1168 break;
1169 case Opt_v4:
1170 mnt->flags &= ~NFS_MOUNT_VER3;
1171 mnt->version = 4;
1172 break;
1173 case Opt_udp:
1174 mnt->flags &= ~NFS_MOUNT_TCP;
1175 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1176 break;
1177 case Opt_tcp:
1178 mnt->flags |= NFS_MOUNT_TCP;
1179 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1180 break;
1181 case Opt_rdma:
1182 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1183 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1184 xprt_load_transport(p);
1185 break;
1186 case Opt_acl:
1187 mnt->flags &= ~NFS_MOUNT_NOACL;
1188 break;
1189 case Opt_noacl:
1190 mnt->flags |= NFS_MOUNT_NOACL;
1191 break;
1192 case Opt_rdirplus:
1193 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1194 break;
1195 case Opt_nordirplus:
1196 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1197 break;
1198 case Opt_sharecache:
1199 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1200 break;
1201 case Opt_nosharecache:
1202 mnt->flags |= NFS_MOUNT_UNSHARED;
1203 break;
1204 case Opt_resvport:
1205 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1206 break;
1207 case Opt_noresvport:
1208 mnt->flags |= NFS_MOUNT_NORESVPORT;
1209 break;
1210 case Opt_fscache:
1211 mnt->options |= NFS_OPTION_FSCACHE;
1212 kfree(mnt->fscache_uniq);
1213 mnt->fscache_uniq = NULL;
1214 break;
1215 case Opt_nofscache:
1216 mnt->options &= ~NFS_OPTION_FSCACHE;
1217 kfree(mnt->fscache_uniq);
1218 mnt->fscache_uniq = NULL;
1219 break;
1220
1221 /*
1222 * options that take numeric values
1223 */
1224 case Opt_port:
1225 if (nfs_get_option_ul(args, &option) ||
1226 option > USHRT_MAX)
1227 goto out_invalid_value;
1228 mnt->nfs_server.port = option;
1229 break;
1230 case Opt_rsize:
1231 if (nfs_get_option_ul(args, &option))
1232 goto out_invalid_value;
1233 mnt->rsize = option;
1234 break;
1235 case Opt_wsize:
1236 if (nfs_get_option_ul(args, &option))
1237 goto out_invalid_value;
1238 mnt->wsize = option;
1239 break;
1240 case Opt_bsize:
1241 if (nfs_get_option_ul(args, &option))
1242 goto out_invalid_value;
1243 mnt->bsize = option;
1244 break;
1245 case Opt_timeo:
1246 if (nfs_get_option_ul(args, &option) || option == 0)
1247 goto out_invalid_value;
1248 mnt->timeo = option;
1249 break;
1250 case Opt_retrans:
1251 if (nfs_get_option_ul(args, &option) || option == 0)
1252 goto out_invalid_value;
1253 mnt->retrans = option;
1254 break;
1255 case Opt_acregmin:
1256 if (nfs_get_option_ul(args, &option))
1257 goto out_invalid_value;
1258 mnt->acregmin = option;
1259 break;
1260 case Opt_acregmax:
1261 if (nfs_get_option_ul(args, &option))
1262 goto out_invalid_value;
1263 mnt->acregmax = option;
1264 break;
1265 case Opt_acdirmin:
1266 if (nfs_get_option_ul(args, &option))
1267 goto out_invalid_value;
1268 mnt->acdirmin = option;
1269 break;
1270 case Opt_acdirmax:
1271 if (nfs_get_option_ul(args, &option))
1272 goto out_invalid_value;
1273 mnt->acdirmax = option;
1274 break;
1275 case Opt_actimeo:
1276 if (nfs_get_option_ul(args, &option))
1277 goto out_invalid_value;
1278 mnt->acregmin = mnt->acregmax =
1279 mnt->acdirmin = mnt->acdirmax = option;
1280 break;
1281 case Opt_namelen:
1282 if (nfs_get_option_ul(args, &option))
1283 goto out_invalid_value;
1284 mnt->namlen = option;
1285 break;
1286 case Opt_mountport:
1287 if (nfs_get_option_ul(args, &option) ||
1288 option > USHRT_MAX)
1289 goto out_invalid_value;
1290 mnt->mount_server.port = option;
1291 break;
1292 case Opt_mountvers:
1293 if (nfs_get_option_ul(args, &option) ||
1294 option < NFS_MNT_VERSION ||
1295 option > NFS_MNT3_VERSION)
1296 goto out_invalid_value;
1297 mnt->mount_server.version = option;
1298 break;
1299 case Opt_nfsvers:
1300 if (nfs_get_option_ul(args, &option))
1301 goto out_invalid_value;
1302 switch (option) {
1303 case NFS2_VERSION:
1304 mnt->flags &= ~NFS_MOUNT_VER3;
1305 mnt->version = 2;
1306 break;
1307 case NFS3_VERSION:
1308 mnt->flags |= NFS_MOUNT_VER3;
1309 mnt->version = 3;
1310 break;
1311 case NFS4_VERSION:
1312 mnt->flags &= ~NFS_MOUNT_VER3;
1313 mnt->version = 4;
1314 break;
1315 default:
1316 goto out_invalid_value;
1317 }
1318 break;
1319 case Opt_minorversion:
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 if (option > NFS4_MAX_MINOR_VERSION)
1323 goto out_invalid_value;
1324 mnt->minorversion = option;
1325 break;
1326
1327 /*
1328 * options that take text values
1329 */
1330 case Opt_sec:
1331 string = match_strdup(args);
1332 if (string == NULL)
1333 goto out_nomem;
1334 rc = nfs_parse_security_flavors(string, mnt);
1335 kfree(string);
1336 if (!rc) {
1337 dfprintk(MOUNT, "NFS: unrecognized "
1338 "security flavor\n");
1339 return 0;
1340 }
1341 break;
1342 case Opt_proto:
1343 string = match_strdup(args);
1344 if (string == NULL)
1345 goto out_nomem;
1346 token = match_token(string,
1347 nfs_xprt_protocol_tokens, args);
1348
1349 protofamily = AF_INET;
1350 switch (token) {
1351 case Opt_xprt_udp6:
1352 protofamily = AF_INET6;
1353 case Opt_xprt_udp:
1354 mnt->flags &= ~NFS_MOUNT_TCP;
1355 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1356 break;
1357 case Opt_xprt_tcp6:
1358 protofamily = AF_INET6;
1359 case Opt_xprt_tcp:
1360 mnt->flags |= NFS_MOUNT_TCP;
1361 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1362 break;
1363 case Opt_xprt_rdma:
1364 /* vector side protocols to TCP */
1365 mnt->flags |= NFS_MOUNT_TCP;
1366 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1367 xprt_load_transport(string);
1368 break;
1369 default:
1370 dfprintk(MOUNT, "NFS: unrecognized "
1371 "transport protocol\n");
1372 kfree(string);
1373 return 0;
1374 }
1375 kfree(string);
1376 break;
1377 case Opt_mountproto:
1378 string = match_strdup(args);
1379 if (string == NULL)
1380 goto out_nomem;
1381 token = match_token(string,
1382 nfs_xprt_protocol_tokens, args);
1383 kfree(string);
1384
1385 mountfamily = AF_INET;
1386 switch (token) {
1387 case Opt_xprt_udp6:
1388 mountfamily = AF_INET6;
1389 case Opt_xprt_udp:
1390 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1391 break;
1392 case Opt_xprt_tcp6:
1393 mountfamily = AF_INET6;
1394 case Opt_xprt_tcp:
1395 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1396 break;
1397 case Opt_xprt_rdma: /* not used for side protocols */
1398 default:
1399 dfprintk(MOUNT, "NFS: unrecognized "
1400 "transport protocol\n");
1401 return 0;
1402 }
1403 break;
1404 case Opt_addr:
1405 string = match_strdup(args);
1406 if (string == NULL)
1407 goto out_nomem;
1408 mnt->nfs_server.addrlen =
1409 rpc_pton(string, strlen(string),
1410 (struct sockaddr *)
1411 &mnt->nfs_server.address,
1412 sizeof(mnt->nfs_server.address));
1413 kfree(string);
1414 if (mnt->nfs_server.addrlen == 0)
1415 goto out_invalid_address;
1416 break;
1417 case Opt_clientaddr:
1418 if (nfs_get_option_str(args, &mnt->client_address))
1419 goto out_nomem;
1420 break;
1421 case Opt_mounthost:
1422 if (nfs_get_option_str(args,
1423 &mnt->mount_server.hostname))
1424 goto out_nomem;
1425 break;
1426 case Opt_mountaddr:
1427 string = match_strdup(args);
1428 if (string == NULL)
1429 goto out_nomem;
1430 mnt->mount_server.addrlen =
1431 rpc_pton(string, strlen(string),
1432 (struct sockaddr *)
1433 &mnt->mount_server.address,
1434 sizeof(mnt->mount_server.address));
1435 kfree(string);
1436 if (mnt->mount_server.addrlen == 0)
1437 goto out_invalid_address;
1438 break;
1439 case Opt_lookupcache:
1440 string = match_strdup(args);
1441 if (string == NULL)
1442 goto out_nomem;
1443 token = match_token(string,
1444 nfs_lookupcache_tokens, args);
1445 kfree(string);
1446 switch (token) {
1447 case Opt_lookupcache_all:
1448 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1449 break;
1450 case Opt_lookupcache_positive:
1451 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1452 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1453 break;
1454 case Opt_lookupcache_none:
1455 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1456 break;
1457 default:
1458 dfprintk(MOUNT, "NFS: invalid "
1459 "lookupcache argument\n");
1460 return 0;
1461 };
1462 break;
1463 case Opt_fscache_uniq:
1464 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1465 goto out_nomem;
1466 mnt->options |= NFS_OPTION_FSCACHE;
1467 break;
1468 case Opt_local_lock:
1469 string = match_strdup(args);
1470 if (string == NULL)
1471 goto out_nomem;
1472 token = match_token(string, nfs_local_lock_tokens,
1473 args);
1474 kfree(string);
1475 switch (token) {
1476 case Opt_local_lock_all:
1477 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1478 NFS_MOUNT_LOCAL_FCNTL);
1479 break;
1480 case Opt_local_lock_flock:
1481 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1482 break;
1483 case Opt_local_lock_posix:
1484 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1485 break;
1486 case Opt_local_lock_none:
1487 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1488 NFS_MOUNT_LOCAL_FCNTL);
1489 break;
1490 default:
1491 dfprintk(MOUNT, "NFS: invalid "
1492 "local_lock argument\n");
1493 return 0;
1494 };
1495 break;
1496
1497 /*
1498 * Special options
1499 */
1500 case Opt_sloppy:
1501 sloppy = 1;
1502 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1503 break;
1504 case Opt_userspace:
1505 case Opt_deprecated:
1506 dfprintk(MOUNT, "NFS: ignoring mount option "
1507 "'%s'\n", p);
1508 break;
1509
1510 default:
1511 invalid_option = 1;
1512 dfprintk(MOUNT, "NFS: unrecognized mount option "
1513 "'%s'\n", p);
1514 }
1515 }
1516
1517 if (!sloppy && invalid_option)
1518 return 0;
1519
1520 /*
1521 * verify that any proto=/mountproto= options match the address
1522 * familiies in the addr=/mountaddr= options.
1523 */
1524 if (protofamily != AF_UNSPEC &&
1525 protofamily != mnt->nfs_server.address.ss_family)
1526 goto out_proto_mismatch;
1527
1528 if (mountfamily != AF_UNSPEC) {
1529 if (mnt->mount_server.addrlen) {
1530 if (mountfamily != mnt->mount_server.address.ss_family)
1531 goto out_mountproto_mismatch;
1532 } else {
1533 if (mountfamily != mnt->nfs_server.address.ss_family)
1534 goto out_mountproto_mismatch;
1535 }
1536 }
1537
1538 return 1;
1539
1540 out_mountproto_mismatch:
1541 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1542 "option\n");
1543 return 0;
1544 out_proto_mismatch:
1545 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1546 return 0;
1547 out_invalid_address:
1548 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1549 return 0;
1550 out_invalid_value:
1551 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1552 return 0;
1553 out_nomem:
1554 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1555 return 0;
1556 out_security_failure:
1557 free_secdata(secdata);
1558 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1559 return 0;
1560 }
1561
1562 /*
1563 * Match the requested auth flavors with the list returned by
1564 * the server. Returns zero and sets the mount's authentication
1565 * flavor on success; returns -EACCES if server does not support
1566 * the requested flavor.
1567 */
1568 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1569 struct nfs_mount_request *request)
1570 {
1571 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1572
1573 /*
1574 * Certain releases of Linux's mountd return an empty
1575 * flavor list. To prevent behavioral regression with
1576 * these servers (ie. rejecting mounts that used to
1577 * succeed), revert to pre-2.6.32 behavior (no checking)
1578 * if the returned flavor list is empty.
1579 */
1580 if (server_authlist_len == 0)
1581 return 0;
1582
1583 /*
1584 * We avoid sophisticated negotiating here, as there are
1585 * plenty of cases where we can get it wrong, providing
1586 * either too little or too much security.
1587 *
1588 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1589 * flavor listed first. However, some servers list
1590 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1591 * preferred default, in args->auth_flavors[0] if user
1592 * didn't specify sec= mount option.
1593 */
1594 for (i = 0; i < args->auth_flavor_len; i++)
1595 for (j = 0; j < server_authlist_len; j++)
1596 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1597 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1598 request->auth_flavs[j]);
1599 args->auth_flavors[0] = request->auth_flavs[j];
1600 return 0;
1601 }
1602
1603 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1604 nfs_umount(request);
1605 return -EACCES;
1606 }
1607
1608 /*
1609 * Use the remote server's MOUNT service to request the NFS file handle
1610 * corresponding to the provided path.
1611 */
1612 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1613 struct nfs_fh *root_fh)
1614 {
1615 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1616 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1617 struct nfs_mount_request request = {
1618 .sap = (struct sockaddr *)
1619 &args->mount_server.address,
1620 .dirpath = args->nfs_server.export_path,
1621 .protocol = args->mount_server.protocol,
1622 .fh = root_fh,
1623 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1624 .auth_flav_len = &server_authlist_len,
1625 .auth_flavs = server_authlist,
1626 };
1627 int status;
1628
1629 if (args->mount_server.version == 0) {
1630 switch (args->version) {
1631 default:
1632 args->mount_server.version = NFS_MNT3_VERSION;
1633 break;
1634 case 2:
1635 args->mount_server.version = NFS_MNT_VERSION;
1636 }
1637 }
1638 request.version = args->mount_server.version;
1639
1640 if (args->mount_server.hostname)
1641 request.hostname = args->mount_server.hostname;
1642 else
1643 request.hostname = args->nfs_server.hostname;
1644
1645 /*
1646 * Construct the mount server's address.
1647 */
1648 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1649 memcpy(request.sap, &args->nfs_server.address,
1650 args->nfs_server.addrlen);
1651 args->mount_server.addrlen = args->nfs_server.addrlen;
1652 }
1653 request.salen = args->mount_server.addrlen;
1654 nfs_set_port(request.sap, &args->mount_server.port, 0);
1655
1656 /*
1657 * Now ask the mount server to map our export path
1658 * to a file handle.
1659 */
1660 status = nfs_mount(&request);
1661 if (status != 0) {
1662 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1663 request.hostname, status);
1664 return status;
1665 }
1666
1667 /*
1668 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1669 */
1670 if (args->mount_server.version != NFS_MNT3_VERSION)
1671 return 0;
1672 return nfs_walk_authlist(args, &request);
1673 }
1674
1675 /*
1676 * Split "dev_name" into "hostname:export_path".
1677 *
1678 * The leftmost colon demarks the split between the server's hostname
1679 * and the export path. If the hostname starts with a left square
1680 * bracket, then it may contain colons.
1681 *
1682 * Note: caller frees hostname and export path, even on error.
1683 */
1684 static int nfs_parse_devname(const char *dev_name,
1685 char **hostname, size_t maxnamlen,
1686 char **export_path, size_t maxpathlen)
1687 {
1688 size_t len;
1689 char *end;
1690
1691 /* Is the host name protected with square brakcets? */
1692 if (*dev_name == '[') {
1693 end = strchr(++dev_name, ']');
1694 if (end == NULL || end[1] != ':')
1695 goto out_bad_devname;
1696
1697 len = end - dev_name;
1698 end++;
1699 } else {
1700 char *comma;
1701
1702 end = strchr(dev_name, ':');
1703 if (end == NULL)
1704 goto out_bad_devname;
1705 len = end - dev_name;
1706
1707 /* kill possible hostname list: not supported */
1708 comma = strchr(dev_name, ',');
1709 if (comma != NULL && comma < end)
1710 *comma = 0;
1711 }
1712
1713 if (len > maxnamlen)
1714 goto out_hostname;
1715
1716 /* N.B. caller will free nfs_server.hostname in all cases */
1717 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1718 if (*hostname == NULL)
1719 goto out_nomem;
1720 len = strlen(++end);
1721 if (len > maxpathlen)
1722 goto out_path;
1723 *export_path = kstrndup(end, len, GFP_KERNEL);
1724 if (!*export_path)
1725 goto out_nomem;
1726
1727 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1728 return 0;
1729
1730 out_bad_devname:
1731 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1732 return -EINVAL;
1733
1734 out_nomem:
1735 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1736 return -ENOMEM;
1737
1738 out_hostname:
1739 dfprintk(MOUNT, "NFS: server hostname too long\n");
1740 return -ENAMETOOLONG;
1741
1742 out_path:
1743 dfprintk(MOUNT, "NFS: export pathname too long\n");
1744 return -ENAMETOOLONG;
1745 }
1746
1747 /*
1748 * Validate the NFS2/NFS3 mount data
1749 * - fills in the mount root filehandle
1750 *
1751 * For option strings, user space handles the following behaviors:
1752 *
1753 * + DNS: mapping server host name to IP address ("addr=" option)
1754 *
1755 * + failure mode: how to behave if a mount request can't be handled
1756 * immediately ("fg/bg" option)
1757 *
1758 * + retry: how often to retry a mount request ("retry=" option)
1759 *
1760 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1761 * mountproto=tcp after mountproto=udp, and so on
1762 */
1763 static int nfs_validate_mount_data(void *options,
1764 struct nfs_parsed_mount_data *args,
1765 struct nfs_fh *mntfh,
1766 const char *dev_name)
1767 {
1768 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1769 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1770
1771 if (data == NULL)
1772 goto out_no_data;
1773
1774 switch (data->version) {
1775 case 1:
1776 data->namlen = 0;
1777 case 2:
1778 data->bsize = 0;
1779 case 3:
1780 if (data->flags & NFS_MOUNT_VER3)
1781 goto out_no_v3;
1782 data->root.size = NFS2_FHSIZE;
1783 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1784 case 4:
1785 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1786 goto out_no_sec;
1787 case 5:
1788 memset(data->context, 0, sizeof(data->context));
1789 case 6:
1790 if (data->flags & NFS_MOUNT_VER3) {
1791 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1792 goto out_invalid_fh;
1793 mntfh->size = data->root.size;
1794 args->version = 3;
1795 } else {
1796 mntfh->size = NFS2_FHSIZE;
1797 args->version = 2;
1798 }
1799
1800
1801 memcpy(mntfh->data, data->root.data, mntfh->size);
1802 if (mntfh->size < sizeof(mntfh->data))
1803 memset(mntfh->data + mntfh->size, 0,
1804 sizeof(mntfh->data) - mntfh->size);
1805
1806 /*
1807 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1808 * can deal with.
1809 */
1810 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1811 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1812 args->rsize = data->rsize;
1813 args->wsize = data->wsize;
1814 args->timeo = data->timeo;
1815 args->retrans = data->retrans;
1816 args->acregmin = data->acregmin;
1817 args->acregmax = data->acregmax;
1818 args->acdirmin = data->acdirmin;
1819 args->acdirmax = data->acdirmax;
1820
1821 memcpy(sap, &data->addr, sizeof(data->addr));
1822 args->nfs_server.addrlen = sizeof(data->addr);
1823 args->nfs_server.port = ntohs(data->addr.sin_port);
1824 if (!nfs_verify_server_address(sap))
1825 goto out_no_address;
1826
1827 if (!(data->flags & NFS_MOUNT_TCP))
1828 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1829 /* N.B. caller will free nfs_server.hostname in all cases */
1830 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1831 args->namlen = data->namlen;
1832 args->bsize = data->bsize;
1833
1834 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1835 args->auth_flavors[0] = data->pseudoflavor;
1836 if (!args->nfs_server.hostname)
1837 goto out_nomem;
1838
1839 if (!(data->flags & NFS_MOUNT_NONLM))
1840 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1841 NFS_MOUNT_LOCAL_FCNTL);
1842 else
1843 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1844 NFS_MOUNT_LOCAL_FCNTL);
1845 /*
1846 * The legacy version 6 binary mount data from userspace has a
1847 * field used only to transport selinux information into the
1848 * the kernel. To continue to support that functionality we
1849 * have a touch of selinux knowledge here in the NFS code. The
1850 * userspace code converted context=blah to just blah so we are
1851 * converting back to the full string selinux understands.
1852 */
1853 if (data->context[0]){
1854 #ifdef CONFIG_SECURITY_SELINUX
1855 int rc;
1856 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1857 if (!opts_str)
1858 return -ENOMEM;
1859 strcpy(opts_str, "context=");
1860 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1861 strcat(opts_str, &data->context[0]);
1862 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1863 kfree(opts_str);
1864 if (rc)
1865 return rc;
1866 #else
1867 return -EINVAL;
1868 #endif
1869 }
1870
1871 break;
1872 default: {
1873 int status;
1874
1875 if (nfs_parse_mount_options((char *)options, args) == 0)
1876 return -EINVAL;
1877
1878 if (!nfs_verify_server_address(sap))
1879 goto out_no_address;
1880
1881 if (args->version == 4)
1882 #ifdef CONFIG_NFS_V4
1883 return nfs4_validate_text_mount_data(options,
1884 args, dev_name);
1885 #else
1886 goto out_v4_not_compiled;
1887 #endif
1888
1889 nfs_set_port(sap, &args->nfs_server.port, 0);
1890
1891 nfs_set_mount_transport_protocol(args);
1892
1893 status = nfs_parse_devname(dev_name,
1894 &args->nfs_server.hostname,
1895 PAGE_SIZE,
1896 &args->nfs_server.export_path,
1897 NFS_MAXPATHLEN);
1898 if (!status)
1899 status = nfs_try_mount(args, mntfh);
1900
1901 kfree(args->nfs_server.export_path);
1902 args->nfs_server.export_path = NULL;
1903
1904 if (status)
1905 return status;
1906
1907 break;
1908 }
1909 }
1910
1911 #ifndef CONFIG_NFS_V3
1912 if (args->version == 3)
1913 goto out_v3_not_compiled;
1914 #endif /* !CONFIG_NFS_V3 */
1915
1916 return 0;
1917
1918 out_no_data:
1919 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1920 return -EINVAL;
1921
1922 out_no_v3:
1923 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1924 data->version);
1925 return -EINVAL;
1926
1927 out_no_sec:
1928 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1929 return -EINVAL;
1930
1931 #ifndef CONFIG_NFS_V3
1932 out_v3_not_compiled:
1933 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1934 return -EPROTONOSUPPORT;
1935 #endif /* !CONFIG_NFS_V3 */
1936
1937 #ifndef CONFIG_NFS_V4
1938 out_v4_not_compiled:
1939 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1940 return -EPROTONOSUPPORT;
1941 #endif /* !CONFIG_NFS_V4 */
1942
1943 out_nomem:
1944 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1945 return -ENOMEM;
1946
1947 out_no_address:
1948 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1949 return -EINVAL;
1950
1951 out_invalid_fh:
1952 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1953 return -EINVAL;
1954 }
1955
1956 static int
1957 nfs_compare_remount_data(struct nfs_server *nfss,
1958 struct nfs_parsed_mount_data *data)
1959 {
1960 if (data->flags != nfss->flags ||
1961 data->rsize != nfss->rsize ||
1962 data->wsize != nfss->wsize ||
1963 data->retrans != nfss->client->cl_timeout->to_retries ||
1964 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1965 data->acregmin != nfss->acregmin / HZ ||
1966 data->acregmax != nfss->acregmax / HZ ||
1967 data->acdirmin != nfss->acdirmin / HZ ||
1968 data->acdirmax != nfss->acdirmax / HZ ||
1969 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1970 data->nfs_server.port != nfss->port ||
1971 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1972 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1973 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1974 return -EINVAL;
1975
1976 return 0;
1977 }
1978
1979 static int
1980 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1981 {
1982 int error;
1983 struct nfs_server *nfss = sb->s_fs_info;
1984 struct nfs_parsed_mount_data *data;
1985 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1986 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1987 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1988
1989 /*
1990 * Userspace mount programs that send binary options generally send
1991 * them populated with default values. We have no way to know which
1992 * ones were explicitly specified. Fall back to legacy behavior and
1993 * just return success.
1994 */
1995 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1996 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1997 options->version <= 6))))
1998 return 0;
1999
2000 data = kzalloc(sizeof(*data), GFP_KERNEL);
2001 if (data == NULL)
2002 return -ENOMEM;
2003
2004 /* fill out struct with values from existing mount */
2005 data->flags = nfss->flags;
2006 data->rsize = nfss->rsize;
2007 data->wsize = nfss->wsize;
2008 data->retrans = nfss->client->cl_timeout->to_retries;
2009 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2010 data->acregmin = nfss->acregmin / HZ;
2011 data->acregmax = nfss->acregmax / HZ;
2012 data->acdirmin = nfss->acdirmin / HZ;
2013 data->acdirmax = nfss->acdirmax / HZ;
2014 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2015 data->nfs_server.port = nfss->port;
2016 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2017 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2018 data->nfs_server.addrlen);
2019
2020 /* overwrite those values with any that were specified */
2021 error = nfs_parse_mount_options((char *)options, data);
2022 if (error < 0)
2023 goto out;
2024
2025 /*
2026 * noac is a special case. It implies -o sync, but that's not
2027 * necessarily reflected in the mtab options. do_remount_sb
2028 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2029 * remount options, so we have to explicitly reset it.
2030 */
2031 if (data->flags & NFS_MOUNT_NOAC)
2032 *flags |= MS_SYNCHRONOUS;
2033
2034 /* compare new mount options with old ones */
2035 error = nfs_compare_remount_data(nfss, data);
2036 out:
2037 kfree(data);
2038 return error;
2039 }
2040
2041 /*
2042 * Initialise the common bits of the superblock
2043 */
2044 static inline void nfs_initialise_sb(struct super_block *sb)
2045 {
2046 struct nfs_server *server = NFS_SB(sb);
2047
2048 sb->s_magic = NFS_SUPER_MAGIC;
2049
2050 /* We probably want something more informative here */
2051 snprintf(sb->s_id, sizeof(sb->s_id),
2052 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2053
2054 if (sb->s_blocksize == 0)
2055 sb->s_blocksize = nfs_block_bits(server->wsize,
2056 &sb->s_blocksize_bits);
2057
2058 sb->s_bdi = &server->backing_dev_info;
2059
2060 nfs_super_set_maxbytes(sb, server->maxfilesize);
2061 }
2062
2063 /*
2064 * Finish setting up an NFS2/3 superblock
2065 */
2066 static void nfs_fill_super(struct super_block *sb,
2067 struct nfs_parsed_mount_data *data)
2068 {
2069 struct nfs_server *server = NFS_SB(sb);
2070
2071 sb->s_blocksize_bits = 0;
2072 sb->s_blocksize = 0;
2073 if (data->bsize)
2074 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2075
2076 if (server->nfs_client->rpc_ops->version == 3) {
2077 /* The VFS shouldn't apply the umask to mode bits. We will do
2078 * so ourselves when necessary.
2079 */
2080 sb->s_flags |= MS_POSIXACL;
2081 sb->s_time_gran = 1;
2082 }
2083
2084 sb->s_op = &nfs_sops;
2085 nfs_initialise_sb(sb);
2086 }
2087
2088 /*
2089 * Finish setting up a cloned NFS2/3 superblock
2090 */
2091 static void nfs_clone_super(struct super_block *sb,
2092 const struct super_block *old_sb)
2093 {
2094 struct nfs_server *server = NFS_SB(sb);
2095
2096 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2097 sb->s_blocksize = old_sb->s_blocksize;
2098 sb->s_maxbytes = old_sb->s_maxbytes;
2099
2100 if (server->nfs_client->rpc_ops->version == 3) {
2101 /* The VFS shouldn't apply the umask to mode bits. We will do
2102 * so ourselves when necessary.
2103 */
2104 sb->s_flags |= MS_POSIXACL;
2105 sb->s_time_gran = 1;
2106 }
2107
2108 sb->s_op = old_sb->s_op;
2109 nfs_initialise_sb(sb);
2110 }
2111
2112 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2113 {
2114 const struct nfs_server *a = s->s_fs_info;
2115 const struct rpc_clnt *clnt_a = a->client;
2116 const struct rpc_clnt *clnt_b = b->client;
2117
2118 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2119 goto Ebusy;
2120 if (a->nfs_client != b->nfs_client)
2121 goto Ebusy;
2122 if (a->flags != b->flags)
2123 goto Ebusy;
2124 if (a->wsize != b->wsize)
2125 goto Ebusy;
2126 if (a->rsize != b->rsize)
2127 goto Ebusy;
2128 if (a->acregmin != b->acregmin)
2129 goto Ebusy;
2130 if (a->acregmax != b->acregmax)
2131 goto Ebusy;
2132 if (a->acdirmin != b->acdirmin)
2133 goto Ebusy;
2134 if (a->acdirmax != b->acdirmax)
2135 goto Ebusy;
2136 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2137 goto Ebusy;
2138 return 1;
2139 Ebusy:
2140 return 0;
2141 }
2142
2143 struct nfs_sb_mountdata {
2144 struct nfs_server *server;
2145 int mntflags;
2146 };
2147
2148 static int nfs_set_super(struct super_block *s, void *data)
2149 {
2150 struct nfs_sb_mountdata *sb_mntdata = data;
2151 struct nfs_server *server = sb_mntdata->server;
2152 int ret;
2153
2154 s->s_flags = sb_mntdata->mntflags;
2155 s->s_fs_info = server;
2156 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2157 ret = set_anon_super(s, server);
2158 if (ret == 0)
2159 server->s_dev = s->s_dev;
2160 return ret;
2161 }
2162
2163 static int nfs_compare_super_address(struct nfs_server *server1,
2164 struct nfs_server *server2)
2165 {
2166 struct sockaddr *sap1, *sap2;
2167
2168 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2169 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2170
2171 if (sap1->sa_family != sap2->sa_family)
2172 return 0;
2173
2174 switch (sap1->sa_family) {
2175 case AF_INET: {
2176 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2177 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2178 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2179 return 0;
2180 if (sin1->sin_port != sin2->sin_port)
2181 return 0;
2182 break;
2183 }
2184 case AF_INET6: {
2185 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2186 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2187 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2188 return 0;
2189 if (sin1->sin6_port != sin2->sin6_port)
2190 return 0;
2191 break;
2192 }
2193 default:
2194 return 0;
2195 }
2196
2197 return 1;
2198 }
2199
2200 static int nfs_compare_super(struct super_block *sb, void *data)
2201 {
2202 struct nfs_sb_mountdata *sb_mntdata = data;
2203 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2204 int mntflags = sb_mntdata->mntflags;
2205
2206 if (!nfs_compare_super_address(old, server))
2207 return 0;
2208 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2209 if (old->flags & NFS_MOUNT_UNSHARED)
2210 return 0;
2211 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2212 return 0;
2213 return nfs_compare_mount_options(sb, server, mntflags);
2214 }
2215
2216 static int nfs_bdi_register(struct nfs_server *server)
2217 {
2218 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2219 }
2220
2221 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2222 int flags, const char *dev_name, void *raw_data)
2223 {
2224 struct nfs_server *server = NULL;
2225 struct super_block *s;
2226 struct nfs_parsed_mount_data *data;
2227 struct nfs_fh *mntfh;
2228 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2229 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2230 struct nfs_sb_mountdata sb_mntdata = {
2231 .mntflags = flags,
2232 };
2233 int error;
2234
2235 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2236 mntfh = nfs_alloc_fhandle();
2237 if (data == NULL || mntfh == NULL)
2238 goto out;
2239
2240 /* Validate the mount data */
2241 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2242 if (error < 0) {
2243 mntroot = ERR_PTR(error);
2244 goto out;
2245 }
2246
2247 #ifdef CONFIG_NFS_V4
2248 if (data->version == 4) {
2249 mntroot = nfs4_try_mount(flags, dev_name, data);
2250 goto out;
2251 }
2252 #endif /* CONFIG_NFS_V4 */
2253
2254 /* Get a volume representation */
2255 server = nfs_create_server(data, mntfh);
2256 if (IS_ERR(server)) {
2257 mntroot = ERR_CAST(server);
2258 goto out;
2259 }
2260 sb_mntdata.server = server;
2261
2262 if (server->flags & NFS_MOUNT_UNSHARED)
2263 compare_super = NULL;
2264
2265 /* -o noac implies -o sync */
2266 if (server->flags & NFS_MOUNT_NOAC)
2267 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2268
2269 /* Get a superblock - note that we may end up sharing one that already exists */
2270 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2271 if (IS_ERR(s)) {
2272 mntroot = ERR_CAST(s);
2273 goto out_err_nosb;
2274 }
2275
2276 if (s->s_fs_info != server) {
2277 nfs_free_server(server);
2278 server = NULL;
2279 } else {
2280 error = nfs_bdi_register(server);
2281 if (error) {
2282 mntroot = ERR_PTR(error);
2283 goto error_splat_bdi;
2284 }
2285 }
2286
2287 if (!s->s_root) {
2288 /* initial superblock/root creation */
2289 nfs_fill_super(s, data);
2290 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2291 }
2292
2293 mntroot = nfs_get_root(s, mntfh, dev_name);
2294 if (IS_ERR(mntroot))
2295 goto error_splat_super;
2296
2297 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2298 if (error)
2299 goto error_splat_root;
2300
2301 s->s_flags |= MS_ACTIVE;
2302
2303 out:
2304 nfs_free_parsed_mount_data(data);
2305 nfs_free_fhandle(mntfh);
2306 return mntroot;
2307
2308 out_err_nosb:
2309 nfs_free_server(server);
2310 goto out;
2311
2312 error_splat_root:
2313 dput(mntroot);
2314 mntroot = ERR_PTR(error);
2315 error_splat_super:
2316 if (server && !s->s_root)
2317 bdi_unregister(&server->backing_dev_info);
2318 error_splat_bdi:
2319 deactivate_locked_super(s);
2320 goto out;
2321 }
2322
2323 /*
2324 * Ensure that we unregister the bdi before kill_anon_super
2325 * releases the device name
2326 */
2327 static void nfs_put_super(struct super_block *s)
2328 {
2329 struct nfs_server *server = NFS_SB(s);
2330
2331 bdi_unregister(&server->backing_dev_info);
2332 }
2333
2334 /*
2335 * Destroy an NFS2/3 superblock
2336 */
2337 static void nfs_kill_super(struct super_block *s)
2338 {
2339 struct nfs_server *server = NFS_SB(s);
2340
2341 kill_anon_super(s);
2342 nfs_fscache_release_super_cookie(s);
2343 nfs_free_server(server);
2344 }
2345
2346 /*
2347 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2348 */
2349 static struct dentry *
2350 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2351 const char *dev_name, void *raw_data)
2352 {
2353 struct nfs_clone_mount *data = raw_data;
2354 struct super_block *s;
2355 struct nfs_server *server;
2356 struct dentry *mntroot;
2357 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2358 struct nfs_sb_mountdata sb_mntdata = {
2359 .mntflags = flags,
2360 };
2361 int error;
2362
2363 dprintk("--> nfs_xdev_mount()\n");
2364
2365 /* create a new volume representation */
2366 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2367 if (IS_ERR(server)) {
2368 error = PTR_ERR(server);
2369 goto out_err_noserver;
2370 }
2371 sb_mntdata.server = server;
2372
2373 if (server->flags & NFS_MOUNT_UNSHARED)
2374 compare_super = NULL;
2375
2376 /* -o noac implies -o sync */
2377 if (server->flags & NFS_MOUNT_NOAC)
2378 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2379
2380 /* Get a superblock - note that we may end up sharing one that already exists */
2381 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2382 if (IS_ERR(s)) {
2383 error = PTR_ERR(s);
2384 goto out_err_nosb;
2385 }
2386
2387 if (s->s_fs_info != server) {
2388 nfs_free_server(server);
2389 server = NULL;
2390 } else {
2391 error = nfs_bdi_register(server);
2392 if (error)
2393 goto error_splat_bdi;
2394 }
2395
2396 if (!s->s_root) {
2397 /* initial superblock/root creation */
2398 nfs_clone_super(s, data->sb);
2399 nfs_fscache_get_super_cookie(s, NULL, data);
2400 }
2401
2402 mntroot = nfs_get_root(s, data->fh, dev_name);
2403 if (IS_ERR(mntroot)) {
2404 error = PTR_ERR(mntroot);
2405 goto error_splat_super;
2406 }
2407 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2408 dput(mntroot);
2409 error = -ESTALE;
2410 goto error_splat_super;
2411 }
2412
2413 s->s_flags |= MS_ACTIVE;
2414
2415 /* clone any lsm security options from the parent to the new sb */
2416 security_sb_clone_mnt_opts(data->sb, s);
2417
2418 dprintk("<-- nfs_xdev_mount() = 0\n");
2419 return mntroot;
2420
2421 out_err_nosb:
2422 nfs_free_server(server);
2423 out_err_noserver:
2424 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2425 return ERR_PTR(error);
2426
2427 error_splat_super:
2428 if (server && !s->s_root)
2429 bdi_unregister(&server->backing_dev_info);
2430 error_splat_bdi:
2431 deactivate_locked_super(s);
2432 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2433 return ERR_PTR(error);
2434 }
2435
2436 #ifdef CONFIG_NFS_V4
2437
2438 /*
2439 * Finish setting up a cloned NFS4 superblock
2440 */
2441 static void nfs4_clone_super(struct super_block *sb,
2442 const struct super_block *old_sb)
2443 {
2444 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2445 sb->s_blocksize = old_sb->s_blocksize;
2446 sb->s_maxbytes = old_sb->s_maxbytes;
2447 sb->s_time_gran = 1;
2448 sb->s_op = old_sb->s_op;
2449 /*
2450 * The VFS shouldn't apply the umask to mode bits. We will do
2451 * so ourselves when necessary.
2452 */
2453 sb->s_flags |= MS_POSIXACL;
2454 sb->s_xattr = old_sb->s_xattr;
2455 nfs_initialise_sb(sb);
2456 }
2457
2458 /*
2459 * Set up an NFS4 superblock
2460 */
2461 static void nfs4_fill_super(struct super_block *sb)
2462 {
2463 sb->s_time_gran = 1;
2464 sb->s_op = &nfs4_sops;
2465 /*
2466 * The VFS shouldn't apply the umask to mode bits. We will do
2467 * so ourselves when necessary.
2468 */
2469 sb->s_flags |= MS_POSIXACL;
2470 sb->s_xattr = nfs4_xattr_handlers;
2471 nfs_initialise_sb(sb);
2472 }
2473
2474 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2475 {
2476 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2477 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2478 }
2479
2480 static int nfs4_validate_text_mount_data(void *options,
2481 struct nfs_parsed_mount_data *args,
2482 const char *dev_name)
2483 {
2484 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2485
2486 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2487
2488 nfs_validate_transport_protocol(args);
2489
2490 nfs4_validate_mount_flags(args);
2491
2492 if (args->version != 4) {
2493 dfprintk(MOUNT,
2494 "NFS4: Illegal mount version\n");
2495 return -EINVAL;
2496 }
2497
2498 if (args->auth_flavor_len > 1) {
2499 dfprintk(MOUNT,
2500 "NFS4: Too many RPC auth flavours specified\n");
2501 return -EINVAL;
2502 }
2503
2504 if (args->client_address == NULL) {
2505 dfprintk(MOUNT,
2506 "NFS4: mount program didn't pass callback address\n");
2507 return -EINVAL;
2508 }
2509
2510 return nfs_parse_devname(dev_name,
2511 &args->nfs_server.hostname,
2512 NFS4_MAXNAMLEN,
2513 &args->nfs_server.export_path,
2514 NFS4_MAXPATHLEN);
2515 }
2516
2517 /*
2518 * Validate NFSv4 mount options
2519 */
2520 static int nfs4_validate_mount_data(void *options,
2521 struct nfs_parsed_mount_data *args,
2522 const char *dev_name)
2523 {
2524 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2525 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2526 char *c;
2527
2528 if (data == NULL)
2529 goto out_no_data;
2530
2531 switch (data->version) {
2532 case 1:
2533 if (data->host_addrlen > sizeof(args->nfs_server.address))
2534 goto out_no_address;
2535 if (data->host_addrlen == 0)
2536 goto out_no_address;
2537 args->nfs_server.addrlen = data->host_addrlen;
2538 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2539 return -EFAULT;
2540 if (!nfs_verify_server_address(sap))
2541 goto out_no_address;
2542 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2543
2544 if (data->auth_flavourlen) {
2545 if (data->auth_flavourlen > 1)
2546 goto out_inval_auth;
2547 if (copy_from_user(&args->auth_flavors[0],
2548 data->auth_flavours,
2549 sizeof(args->auth_flavors[0])))
2550 return -EFAULT;
2551 }
2552
2553 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2554 if (IS_ERR(c))
2555 return PTR_ERR(c);
2556 args->nfs_server.hostname = c;
2557
2558 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2559 if (IS_ERR(c))
2560 return PTR_ERR(c);
2561 args->nfs_server.export_path = c;
2562 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2563
2564 c = strndup_user(data->client_addr.data, 16);
2565 if (IS_ERR(c))
2566 return PTR_ERR(c);
2567 args->client_address = c;
2568
2569 /*
2570 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2571 * can deal with.
2572 */
2573
2574 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2575 args->rsize = data->rsize;
2576 args->wsize = data->wsize;
2577 args->timeo = data->timeo;
2578 args->retrans = data->retrans;
2579 args->acregmin = data->acregmin;
2580 args->acregmax = data->acregmax;
2581 args->acdirmin = data->acdirmin;
2582 args->acdirmax = data->acdirmax;
2583 args->nfs_server.protocol = data->proto;
2584 nfs_validate_transport_protocol(args);
2585
2586 break;
2587 default:
2588 if (nfs_parse_mount_options((char *)options, args) == 0)
2589 return -EINVAL;
2590
2591 if (!nfs_verify_server_address(sap))
2592 return -EINVAL;
2593
2594 return nfs4_validate_text_mount_data(options, args, dev_name);
2595 }
2596
2597 return 0;
2598
2599 out_no_data:
2600 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2601 return -EINVAL;
2602
2603 out_inval_auth:
2604 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2605 data->auth_flavourlen);
2606 return -EINVAL;
2607
2608 out_no_address:
2609 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2610 return -EINVAL;
2611 }
2612
2613 /*
2614 * Get the superblock for the NFS4 root partition
2615 */
2616 static struct dentry *
2617 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2618 const char *dev_name, void *raw_data)
2619 {
2620 struct nfs_parsed_mount_data *data = raw_data;
2621 struct super_block *s;
2622 struct nfs_server *server;
2623 struct nfs_fh *mntfh;
2624 struct dentry *mntroot;
2625 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2626 struct nfs_sb_mountdata sb_mntdata = {
2627 .mntflags = flags,
2628 };
2629 int error = -ENOMEM;
2630
2631 mntfh = nfs_alloc_fhandle();
2632 if (data == NULL || mntfh == NULL)
2633 goto out;
2634
2635 /* Get a volume representation */
2636 server = nfs4_create_server(data, mntfh);
2637 if (IS_ERR(server)) {
2638 error = PTR_ERR(server);
2639 goto out;
2640 }
2641 sb_mntdata.server = server;
2642
2643 if (server->flags & NFS4_MOUNT_UNSHARED)
2644 compare_super = NULL;
2645
2646 /* -o noac implies -o sync */
2647 if (server->flags & NFS_MOUNT_NOAC)
2648 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2649
2650 /* Get a superblock - note that we may end up sharing one that already exists */
2651 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2652 if (IS_ERR(s)) {
2653 error = PTR_ERR(s);
2654 goto out_free;
2655 }
2656
2657 if (s->s_fs_info != server) {
2658 nfs_free_server(server);
2659 server = NULL;
2660 } else {
2661 error = nfs_bdi_register(server);
2662 if (error)
2663 goto error_splat_bdi;
2664 }
2665
2666 if (!s->s_root) {
2667 /* initial superblock/root creation */
2668 nfs4_fill_super(s);
2669 nfs_fscache_get_super_cookie(
2670 s, data ? data->fscache_uniq : NULL, NULL);
2671 }
2672
2673 mntroot = nfs4_get_root(s, mntfh, dev_name);
2674 if (IS_ERR(mntroot)) {
2675 error = PTR_ERR(mntroot);
2676 goto error_splat_super;
2677 }
2678
2679 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2680 if (error)
2681 goto error_splat_root;
2682
2683 s->s_flags |= MS_ACTIVE;
2684
2685 nfs_free_fhandle(mntfh);
2686 return mntroot;
2687
2688 out:
2689 nfs_free_fhandle(mntfh);
2690 return ERR_PTR(error);
2691
2692 out_free:
2693 nfs_free_server(server);
2694 goto out;
2695
2696 error_splat_root:
2697 dput(mntroot);
2698 error_splat_super:
2699 if (server && !s->s_root)
2700 bdi_unregister(&server->backing_dev_info);
2701 error_splat_bdi:
2702 deactivate_locked_super(s);
2703 goto out;
2704 }
2705
2706 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2707 int flags, void *data, const char *hostname)
2708 {
2709 struct vfsmount *root_mnt;
2710 char *root_devname;
2711 size_t len;
2712
2713 len = strlen(hostname) + 5;
2714 root_devname = kmalloc(len, GFP_KERNEL);
2715 if (root_devname == NULL)
2716 return ERR_PTR(-ENOMEM);
2717 /* Does hostname needs to be enclosed in brackets? */
2718 if (strchr(hostname, ':'))
2719 snprintf(root_devname, len, "[%s]:/", hostname);
2720 else
2721 snprintf(root_devname, len, "%s:/", hostname);
2722 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2723 kfree(root_devname);
2724 return root_mnt;
2725 }
2726
2727 struct nfs_referral_count {
2728 struct list_head list;
2729 const struct task_struct *task;
2730 unsigned int referral_count;
2731 };
2732
2733 static LIST_HEAD(nfs_referral_count_list);
2734 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2735
2736 static struct nfs_referral_count *nfs_find_referral_count(void)
2737 {
2738 struct nfs_referral_count *p;
2739
2740 list_for_each_entry(p, &nfs_referral_count_list, list) {
2741 if (p->task == current)
2742 return p;
2743 }
2744 return NULL;
2745 }
2746
2747 #define NFS_MAX_NESTED_REFERRALS 2
2748
2749 static int nfs_referral_loop_protect(void)
2750 {
2751 struct nfs_referral_count *p, *new;
2752 int ret = -ENOMEM;
2753
2754 new = kmalloc(sizeof(*new), GFP_KERNEL);
2755 if (!new)
2756 goto out;
2757 new->task = current;
2758 new->referral_count = 1;
2759
2760 ret = 0;
2761 spin_lock(&nfs_referral_count_list_lock);
2762 p = nfs_find_referral_count();
2763 if (p != NULL) {
2764 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2765 ret = -ELOOP;
2766 else
2767 p->referral_count++;
2768 } else {
2769 list_add(&new->list, &nfs_referral_count_list);
2770 new = NULL;
2771 }
2772 spin_unlock(&nfs_referral_count_list_lock);
2773 kfree(new);
2774 out:
2775 return ret;
2776 }
2777
2778 static void nfs_referral_loop_unprotect(void)
2779 {
2780 struct nfs_referral_count *p;
2781
2782 spin_lock(&nfs_referral_count_list_lock);
2783 p = nfs_find_referral_count();
2784 p->referral_count--;
2785 if (p->referral_count == 0)
2786 list_del(&p->list);
2787 else
2788 p = NULL;
2789 spin_unlock(&nfs_referral_count_list_lock);
2790 kfree(p);
2791 }
2792
2793 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2794 const char *export_path)
2795 {
2796 struct dentry *dentry;
2797 int ret = nfs_referral_loop_protect();
2798
2799 if (ret) {
2800 mntput(root_mnt);
2801 return ERR_PTR(ret);
2802 }
2803
2804 dentry = mount_subtree(root_mnt, export_path);
2805 nfs_referral_loop_unprotect();
2806
2807 return dentry;
2808 }
2809
2810 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2811 struct nfs_parsed_mount_data *data)
2812 {
2813 char *export_path;
2814 struct vfsmount *root_mnt;
2815 struct dentry *res;
2816
2817 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2818
2819 export_path = data->nfs_server.export_path;
2820 data->nfs_server.export_path = "/";
2821 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2822 data->nfs_server.hostname);
2823 data->nfs_server.export_path = export_path;
2824
2825 res = ERR_CAST(root_mnt);
2826 if (!IS_ERR(root_mnt))
2827 res = nfs_follow_remote_path(root_mnt, export_path);
2828
2829 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2830 IS_ERR(res) ? PTR_ERR(res) : 0,
2831 IS_ERR(res) ? " [error]" : "");
2832 return res;
2833 }
2834
2835 /*
2836 * Get the superblock for an NFS4 mountpoint
2837 */
2838 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2839 int flags, const char *dev_name, void *raw_data)
2840 {
2841 struct nfs_parsed_mount_data *data;
2842 int error = -ENOMEM;
2843 struct dentry *res = ERR_PTR(-ENOMEM);
2844
2845 data = nfs_alloc_parsed_mount_data(4);
2846 if (data == NULL)
2847 goto out;
2848
2849 /* Validate the mount data */
2850 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2851 if (error < 0) {
2852 res = ERR_PTR(error);
2853 goto out;
2854 }
2855
2856 res = nfs4_try_mount(flags, dev_name, data);
2857 if (IS_ERR(res))
2858 error = PTR_ERR(res);
2859
2860 out:
2861 nfs_free_parsed_mount_data(data);
2862 dprintk("<-- nfs4_mount() = %d%s\n", error,
2863 error != 0 ? " [error]" : "");
2864 return res;
2865 }
2866
2867 static void nfs4_kill_super(struct super_block *sb)
2868 {
2869 struct nfs_server *server = NFS_SB(sb);
2870
2871 dprintk("--> %s\n", __func__);
2872 nfs_super_return_all_delegations(sb);
2873 kill_anon_super(sb);
2874 nfs_fscache_release_super_cookie(sb);
2875 nfs_free_server(server);
2876 dprintk("<-- %s\n", __func__);
2877 }
2878
2879 /*
2880 * Clone an NFS4 server record on xdev traversal (FSID-change)
2881 */
2882 static struct dentry *
2883 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2884 const char *dev_name, void *raw_data)
2885 {
2886 struct nfs_clone_mount *data = raw_data;
2887 struct super_block *s;
2888 struct nfs_server *server;
2889 struct dentry *mntroot;
2890 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2891 struct nfs_sb_mountdata sb_mntdata = {
2892 .mntflags = flags,
2893 };
2894 int error;
2895
2896 dprintk("--> nfs4_xdev_mount()\n");
2897
2898 /* create a new volume representation */
2899 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2900 if (IS_ERR(server)) {
2901 error = PTR_ERR(server);
2902 goto out_err_noserver;
2903 }
2904 sb_mntdata.server = server;
2905
2906 if (server->flags & NFS4_MOUNT_UNSHARED)
2907 compare_super = NULL;
2908
2909 /* -o noac implies -o sync */
2910 if (server->flags & NFS_MOUNT_NOAC)
2911 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2912
2913 /* Get a superblock - note that we may end up sharing one that already exists */
2914 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2915 if (IS_ERR(s)) {
2916 error = PTR_ERR(s);
2917 goto out_err_nosb;
2918 }
2919
2920 if (s->s_fs_info != server) {
2921 nfs_free_server(server);
2922 server = NULL;
2923 } else {
2924 error = nfs_bdi_register(server);
2925 if (error)
2926 goto error_splat_bdi;
2927 }
2928
2929 if (!s->s_root) {
2930 /* initial superblock/root creation */
2931 nfs4_clone_super(s, data->sb);
2932 nfs_fscache_get_super_cookie(s, NULL, data);
2933 }
2934
2935 mntroot = nfs4_get_root(s, data->fh, dev_name);
2936 if (IS_ERR(mntroot)) {
2937 error = PTR_ERR(mntroot);
2938 goto error_splat_super;
2939 }
2940 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2941 dput(mntroot);
2942 error = -ESTALE;
2943 goto error_splat_super;
2944 }
2945
2946 s->s_flags |= MS_ACTIVE;
2947
2948 security_sb_clone_mnt_opts(data->sb, s);
2949
2950 dprintk("<-- nfs4_xdev_mount() = 0\n");
2951 return mntroot;
2952
2953 out_err_nosb:
2954 nfs_free_server(server);
2955 out_err_noserver:
2956 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2957 return ERR_PTR(error);
2958
2959 error_splat_super:
2960 if (server && !s->s_root)
2961 bdi_unregister(&server->backing_dev_info);
2962 error_splat_bdi:
2963 deactivate_locked_super(s);
2964 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2965 return ERR_PTR(error);
2966 }
2967
2968 static struct dentry *
2969 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2970 const char *dev_name, void *raw_data)
2971 {
2972 struct nfs_clone_mount *data = raw_data;
2973 struct super_block *s;
2974 struct nfs_server *server;
2975 struct dentry *mntroot;
2976 struct nfs_fh *mntfh;
2977 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2978 struct nfs_sb_mountdata sb_mntdata = {
2979 .mntflags = flags,
2980 };
2981 int error = -ENOMEM;
2982
2983 dprintk("--> nfs4_referral_get_sb()\n");
2984
2985 mntfh = nfs_alloc_fhandle();
2986 if (mntfh == NULL)
2987 goto out_err_nofh;
2988
2989 /* create a new volume representation */
2990 server = nfs4_create_referral_server(data, mntfh);
2991 if (IS_ERR(server)) {
2992 error = PTR_ERR(server);
2993 goto out_err_noserver;
2994 }
2995 sb_mntdata.server = server;
2996
2997 if (server->flags & NFS4_MOUNT_UNSHARED)
2998 compare_super = NULL;
2999
3000 /* -o noac implies -o sync */
3001 if (server->flags & NFS_MOUNT_NOAC)
3002 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3003
3004 /* Get a superblock - note that we may end up sharing one that already exists */
3005 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3006 if (IS_ERR(s)) {
3007 error = PTR_ERR(s);
3008 goto out_err_nosb;
3009 }
3010
3011 if (s->s_fs_info != server) {
3012 nfs_free_server(server);
3013 server = NULL;
3014 } else {
3015 error = nfs_bdi_register(server);
3016 if (error)
3017 goto error_splat_bdi;
3018 }
3019
3020 if (!s->s_root) {
3021 /* initial superblock/root creation */
3022 nfs4_fill_super(s);
3023 nfs_fscache_get_super_cookie(s, NULL, data);
3024 }
3025
3026 mntroot = nfs4_get_root(s, mntfh, dev_name);
3027 if (IS_ERR(mntroot)) {
3028 error = PTR_ERR(mntroot);
3029 goto error_splat_super;
3030 }
3031 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3032 dput(mntroot);
3033 error = -ESTALE;
3034 goto error_splat_super;
3035 }
3036
3037 s->s_flags |= MS_ACTIVE;
3038
3039 security_sb_clone_mnt_opts(data->sb, s);
3040
3041 nfs_free_fhandle(mntfh);
3042 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3043 return mntroot;
3044
3045 out_err_nosb:
3046 nfs_free_server(server);
3047 out_err_noserver:
3048 nfs_free_fhandle(mntfh);
3049 out_err_nofh:
3050 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3051 return ERR_PTR(error);
3052
3053 error_splat_super:
3054 if (server && !s->s_root)
3055 bdi_unregister(&server->backing_dev_info);
3056 error_splat_bdi:
3057 deactivate_locked_super(s);
3058 nfs_free_fhandle(mntfh);
3059 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3060 return ERR_PTR(error);
3061 }
3062
3063 /*
3064 * Create an NFS4 server record on referral traversal
3065 */
3066 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3067 int flags, const char *dev_name, void *raw_data)
3068 {
3069 struct nfs_clone_mount *data = raw_data;
3070 char *export_path;
3071 struct vfsmount *root_mnt;
3072 struct dentry *res;
3073
3074 dprintk("--> nfs4_referral_mount()\n");
3075
3076 export_path = data->mnt_path;
3077 data->mnt_path = "/";
3078
3079 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3080 flags, data, data->hostname);
3081 data->mnt_path = export_path;
3082
3083 res = ERR_CAST(root_mnt);
3084 if (!IS_ERR(root_mnt))
3085 res = nfs_follow_remote_path(root_mnt, export_path);
3086 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3087 IS_ERR(res) ? PTR_ERR(res) : 0,
3088 IS_ERR(res) ? " [error]" : "");
3089 return res;
3090 }
3091
3092 MODULE_ALIAS("nfs4");
3093
3094 #endif /* CONFIG_NFS_V4 */
Linux with added FPC-III support