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[media] saa7134: use full keycode for BeholdTV
[linux-2.6.git] / fs / nfs / super.c
blob4100630c9a5b65f47bb5379ee2bc62f78e60284e
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
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 #ifdef CONFIG_NFS_V3
70 #define NFS_DEFAULT_VERSION 3
71 #else
72 #define NFS_DEFAULT_VERSION 2
73 #endif
74
75 enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
82 Opt_v2, Opt_v3, Opt_v4,
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_nfsvers,
101 Opt_minorversion,
102
103 /* Mount options that take string arguments */
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_v2, "v2" },
136 { Opt_v3, "v3" },
137 { Opt_v4, "v4" },
138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
140 { Opt_rdma, "rdma" },
141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
149 { Opt_fscache, "fsc" },
150 { Opt_nofscache, "nofsc" },
151
152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168 { Opt_minorversion, "minorversion=%s" },
169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
175 { Opt_mounthost, "mounthost=%s" },
176 { Opt_mountaddr, "mountaddr=%s" },
177
178 { Opt_lookupcache, "lookupcache=%s" },
179 { Opt_fscache_uniq, "fsc=%s" },
180 { Opt_local_lock, "local_lock=%s" },
181
182 { Opt_err, NULL }
183 };
184
185 enum {
186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
187
188 Opt_xprt_err
189 };
190
191 static const match_table_t nfs_xprt_protocol_tokens = {
192 { Opt_xprt_udp, "udp" },
193 { Opt_xprt_udp6, "udp6" },
194 { Opt_xprt_tcp, "tcp" },
195 { Opt_xprt_tcp6, "tcp6" },
196 { Opt_xprt_rdma, "rdma" },
197
198 { Opt_xprt_err, NULL }
199 };
200
201 enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208 };
209
210 static const match_table_t nfs_secflavor_tokens = {
211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
227 { Opt_sec_err, NULL }
228 };
229
230 enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235 };
236
237 static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244 };
245
246 enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251 };
252
253 static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260 };
261
262
263 static void nfs_umount_begin(struct super_block *);
264 static int nfs_statfs(struct dentry *, struct kstatfs *);
265 static int nfs_show_options(struct seq_file *, struct vfsmount *);
266 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
267 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
268 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
269 int flags, const char *dev_name, void *raw_data);
270 static void nfs_put_super(struct super_block *);
271 static void nfs_kill_super(struct super_block *);
272 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
273
274 static struct file_system_type nfs_fs_type = {
275 .owner = THIS_MODULE,
276 .name = "nfs",
277 .get_sb = nfs_get_sb,
278 .kill_sb = nfs_kill_super,
279 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
280 };
281
282 struct file_system_type nfs_xdev_fs_type = {
283 .owner = THIS_MODULE,
284 .name = "nfs",
285 .mount = nfs_xdev_mount,
286 .kill_sb = nfs_kill_super,
287 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
288 };
289
290 static const struct super_operations nfs_sops = {
291 .alloc_inode = nfs_alloc_inode,
292 .destroy_inode = nfs_destroy_inode,
293 .write_inode = nfs_write_inode,
294 .put_super = nfs_put_super,
295 .statfs = nfs_statfs,
296 .evict_inode = nfs_evict_inode,
297 .umount_begin = nfs_umount_begin,
298 .show_options = nfs_show_options,
299 .show_stats = nfs_show_stats,
300 .remount_fs = nfs_remount,
301 };
302
303 #ifdef CONFIG_NFS_V4
304 static int nfs4_validate_text_mount_data(void *options,
305 struct nfs_parsed_mount_data *args, const char *dev_name);
306 static int nfs4_try_mount(int flags, const char *dev_name,
307 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
308 static int nfs4_get_sb(struct file_system_type *fs_type,
309 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
310 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
311 int flags, const char *dev_name, void *raw_data);
312 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
313 int flags, const char *dev_name, void *raw_data);
314 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
316 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318 static void nfs4_kill_super(struct super_block *sb);
319
320 static struct file_system_type nfs4_fs_type = {
321 .owner = THIS_MODULE,
322 .name = "nfs4",
323 .get_sb = nfs4_get_sb,
324 .kill_sb = nfs4_kill_super,
325 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
326 };
327
328 static struct file_system_type nfs4_remote_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
331 .mount = nfs4_remote_mount,
332 .kill_sb = nfs4_kill_super,
333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
334 };
335
336 struct file_system_type nfs4_xdev_fs_type = {
337 .owner = THIS_MODULE,
338 .name = "nfs4",
339 .mount = nfs4_xdev_mount,
340 .kill_sb = nfs4_kill_super,
341 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
342 };
343
344 static struct file_system_type nfs4_remote_referral_fs_type = {
345 .owner = THIS_MODULE,
346 .name = "nfs4",
347 .mount = nfs4_remote_referral_mount,
348 .kill_sb = nfs4_kill_super,
349 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
350 };
351
352 struct file_system_type nfs4_referral_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
355 .get_sb = nfs4_referral_get_sb,
356 .kill_sb = nfs4_kill_super,
357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
358 };
359
360 static const struct super_operations nfs4_sops = {
361 .alloc_inode = nfs_alloc_inode,
362 .destroy_inode = nfs_destroy_inode,
363 .write_inode = nfs_write_inode,
364 .put_super = nfs_put_super,
365 .statfs = nfs_statfs,
366 .evict_inode = nfs4_evict_inode,
367 .umount_begin = nfs_umount_begin,
368 .show_options = nfs_show_options,
369 .show_stats = nfs_show_stats,
370 .remount_fs = nfs_remount,
371 };
372 #endif
373
374 static struct shrinker acl_shrinker = {
375 .shrink = nfs_access_cache_shrinker,
376 .seeks = DEFAULT_SEEKS,
377 };
378
379 /*
380 * Register the NFS filesystems
381 */
382 int __init register_nfs_fs(void)
383 {
384 int ret;
385
386 ret = register_filesystem(&nfs_fs_type);
387 if (ret < 0)
388 goto error_0;
389
390 ret = nfs_register_sysctl();
391 if (ret < 0)
392 goto error_1;
393 #ifdef CONFIG_NFS_V4
394 ret = register_filesystem(&nfs4_fs_type);
395 if (ret < 0)
396 goto error_2;
397 #endif
398 register_shrinker(&acl_shrinker);
399 return 0;
400
401 #ifdef CONFIG_NFS_V4
402 error_2:
403 nfs_unregister_sysctl();
404 #endif
405 error_1:
406 unregister_filesystem(&nfs_fs_type);
407 error_0:
408 return ret;
409 }
410
411 /*
412 * Unregister the NFS filesystems
413 */
414 void __exit unregister_nfs_fs(void)
415 {
416 unregister_shrinker(&acl_shrinker);
417 #ifdef CONFIG_NFS_V4
418 unregister_filesystem(&nfs4_fs_type);
419 #endif
420 nfs_unregister_sysctl();
421 unregister_filesystem(&nfs_fs_type);
422 }
423
424 void nfs_sb_active(struct super_block *sb)
425 {
426 struct nfs_server *server = NFS_SB(sb);
427
428 if (atomic_inc_return(&server->active) == 1)
429 atomic_inc(&sb->s_active);
430 }
431
432 void nfs_sb_deactive(struct super_block *sb)
433 {
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_dec_and_test(&server->active))
437 deactivate_super(sb);
438 }
439
440 /*
441 * Deliver file system statistics to userspace
442 */
443 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
444 {
445 struct nfs_server *server = NFS_SB(dentry->d_sb);
446 unsigned char blockbits;
447 unsigned long blockres;
448 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
449 struct nfs_fsstat res;
450 int error = -ENOMEM;
451
452 res.fattr = nfs_alloc_fattr();
453 if (res.fattr == NULL)
454 goto out_err;
455
456 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
457 if (unlikely(error == -ESTALE)) {
458 struct dentry *pd_dentry;
459
460 pd_dentry = dget_parent(dentry);
461 if (pd_dentry != NULL) {
462 nfs_zap_caches(pd_dentry->d_inode);
463 dput(pd_dentry);
464 }
465 }
466 nfs_free_fattr(res.fattr);
467 if (error < 0)
468 goto out_err;
469
470 buf->f_type = NFS_SUPER_MAGIC;
471
472 /*
473 * Current versions of glibc do not correctly handle the
474 * case where f_frsize != f_bsize. Eventually we want to
475 * report the value of wtmult in this field.
476 */
477 buf->f_frsize = dentry->d_sb->s_blocksize;
478
479 /*
480 * On most *nix systems, f_blocks, f_bfree, and f_bavail
481 * are reported in units of f_frsize. Linux hasn't had
482 * an f_frsize field in its statfs struct until recently,
483 * thus historically Linux's sys_statfs reports these
484 * fields in units of f_bsize.
485 */
486 buf->f_bsize = dentry->d_sb->s_blocksize;
487 blockbits = dentry->d_sb->s_blocksize_bits;
488 blockres = (1 << blockbits) - 1;
489 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
490 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
491 buf->f_bavail = (res.abytes + blockres) >> blockbits;
492
493 buf->f_files = res.tfiles;
494 buf->f_ffree = res.afiles;
495
496 buf->f_namelen = server->namelen;
497
498 return 0;
499
500 out_err:
501 dprintk("%s: statfs error = %d\n", __func__, -error);
502 return error;
503 }
504
505 /*
506 * Map the security flavour number to a name
507 */
508 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
509 {
510 static const struct {
511 rpc_authflavor_t flavour;
512 const char *str;
513 } sec_flavours[] = {
514 { RPC_AUTH_NULL, "null" },
515 { RPC_AUTH_UNIX, "sys" },
516 { RPC_AUTH_GSS_KRB5, "krb5" },
517 { RPC_AUTH_GSS_KRB5I, "krb5i" },
518 { RPC_AUTH_GSS_KRB5P, "krb5p" },
519 { RPC_AUTH_GSS_LKEY, "lkey" },
520 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
521 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
522 { RPC_AUTH_GSS_SPKM, "spkm" },
523 { RPC_AUTH_GSS_SPKMI, "spkmi" },
524 { RPC_AUTH_GSS_SPKMP, "spkmp" },
525 { UINT_MAX, "unknown" }
526 };
527 int i;
528
529 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
530 if (sec_flavours[i].flavour == flavour)
531 break;
532 }
533 return sec_flavours[i].str;
534 }
535
536 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
537 int showdefaults)
538 {
539 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
540
541 seq_printf(m, ",mountproto=");
542 switch (sap->sa_family) {
543 case AF_INET:
544 switch (nfss->mountd_protocol) {
545 case IPPROTO_UDP:
546 seq_printf(m, RPCBIND_NETID_UDP);
547 break;
548 case IPPROTO_TCP:
549 seq_printf(m, RPCBIND_NETID_TCP);
550 break;
551 default:
552 if (showdefaults)
553 seq_printf(m, "auto");
554 }
555 break;
556 case AF_INET6:
557 switch (nfss->mountd_protocol) {
558 case IPPROTO_UDP:
559 seq_printf(m, RPCBIND_NETID_UDP6);
560 break;
561 case IPPROTO_TCP:
562 seq_printf(m, RPCBIND_NETID_TCP6);
563 break;
564 default:
565 if (showdefaults)
566 seq_printf(m, "auto");
567 }
568 break;
569 default:
570 if (showdefaults)
571 seq_printf(m, "auto");
572 }
573 }
574
575 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
576 int showdefaults)
577 {
578 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
579
580 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
581 return;
582
583 switch (sap->sa_family) {
584 case AF_INET: {
585 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
586 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
587 break;
588 }
589 case AF_INET6: {
590 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
591 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
592 break;
593 }
594 default:
595 if (showdefaults)
596 seq_printf(m, ",mountaddr=unspecified");
597 }
598
599 if (nfss->mountd_version || showdefaults)
600 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
601 if (nfss->mountd_port || showdefaults)
602 seq_printf(m, ",mountport=%u", nfss->mountd_port);
603
604 nfs_show_mountd_netid(m, nfss, showdefaults);
605 }
606
607 #ifdef CONFIG_NFS_V4
608 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
609 int showdefaults)
610 {
611 struct nfs_client *clp = nfss->nfs_client;
612
613 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
614 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
615 }
616 #else
617 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619 {
620 }
621 #endif
622
623 /*
624 * Describe the mount options in force on this server representation
625 */
626 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
628 {
629 static const struct proc_nfs_info {
630 int flag;
631 const char *str;
632 const char *nostr;
633 } nfs_info[] = {
634 { NFS_MOUNT_SOFT, ",soft", ",hard" },
635 { NFS_MOUNT_POSIX, ",posix", "" },
636 { NFS_MOUNT_NOCTO, ",nocto", "" },
637 { NFS_MOUNT_NOAC, ",noac", "" },
638 { NFS_MOUNT_NONLM, ",nolock", "" },
639 { NFS_MOUNT_NOACL, ",noacl", "" },
640 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
641 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
642 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
643 { 0, NULL, NULL }
644 };
645 const struct proc_nfs_info *nfs_infop;
646 struct nfs_client *clp = nfss->nfs_client;
647 u32 version = clp->rpc_ops->version;
648 int local_flock, local_fcntl;
649
650 seq_printf(m, ",vers=%u", version);
651 seq_printf(m, ",rsize=%u", nfss->rsize);
652 seq_printf(m, ",wsize=%u", nfss->wsize);
653 if (nfss->bsize != 0)
654 seq_printf(m, ",bsize=%u", nfss->bsize);
655 seq_printf(m, ",namlen=%u", nfss->namelen);
656 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
657 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
658 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
659 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
660 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
661 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
662 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
663 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
664 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
665 if (nfss->flags & nfs_infop->flag)
666 seq_puts(m, nfs_infop->str);
667 else
668 seq_puts(m, nfs_infop->nostr);
669 }
670 seq_printf(m, ",proto=%s",
671 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
672 if (version == 4) {
673 if (nfss->port != NFS_PORT)
674 seq_printf(m, ",port=%u", nfss->port);
675 } else
676 if (nfss->port)
677 seq_printf(m, ",port=%u", nfss->port);
678
679 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
680 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
681 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
682
683 if (version != 4)
684 nfs_show_mountd_options(m, nfss, showdefaults);
685 else
686 nfs_show_nfsv4_options(m, nfss, showdefaults);
687
688 if (nfss->options & NFS_OPTION_FSCACHE)
689 seq_printf(m, ",fsc");
690
691 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
692 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
693 seq_printf(m, ",lookupcache=none");
694 else
695 seq_printf(m, ",lookupcache=pos");
696 }
697
698 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
699 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
700
701 if (!local_flock && !local_fcntl)
702 seq_printf(m, ",local_lock=none");
703 else if (local_flock && local_fcntl)
704 seq_printf(m, ",local_lock=all");
705 else if (local_flock)
706 seq_printf(m, ",local_lock=flock");
707 else
708 seq_printf(m, ",local_lock=posix");
709 }
710
711 /*
712 * Describe the mount options on this VFS mountpoint
713 */
714 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
715 {
716 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
717
718 nfs_show_mount_options(m, nfss, 0);
719
720 seq_printf(m, ",addr=%s",
721 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
722 RPC_DISPLAY_ADDR));
723
724 return 0;
725 }
726
727 /*
728 * Present statistical information for this VFS mountpoint
729 */
730 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
731 {
732 int i, cpu;
733 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
734 struct rpc_auth *auth = nfss->client->cl_auth;
735 struct nfs_iostats totals = { };
736
737 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
738
739 /*
740 * Display all mount option settings
741 */
742 seq_printf(m, "\n\topts:\t");
743 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
744 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
745 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
746 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
747 nfs_show_mount_options(m, nfss, 1);
748
749 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
750
751 seq_printf(m, "\n\tcaps:\t");
752 seq_printf(m, "caps=0x%x", nfss->caps);
753 seq_printf(m, ",wtmult=%u", nfss->wtmult);
754 seq_printf(m, ",dtsize=%u", nfss->dtsize);
755 seq_printf(m, ",bsize=%u", nfss->bsize);
756 seq_printf(m, ",namlen=%u", nfss->namelen);
757
758 #ifdef CONFIG_NFS_V4
759 if (nfss->nfs_client->rpc_ops->version == 4) {
760 seq_printf(m, "\n\tnfsv4:\t");
761 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
762 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
763 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
764 }
765 #endif
766
767 /*
768 * Display security flavor in effect for this mount
769 */
770 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
771 if (auth->au_flavor)
772 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
773
774 /*
775 * Display superblock I/O counters
776 */
777 for_each_possible_cpu(cpu) {
778 struct nfs_iostats *stats;
779
780 preempt_disable();
781 stats = per_cpu_ptr(nfss->io_stats, cpu);
782
783 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
784 totals.events[i] += stats->events[i];
785 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
786 totals.bytes[i] += stats->bytes[i];
787 #ifdef CONFIG_NFS_FSCACHE
788 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
789 totals.fscache[i] += stats->fscache[i];
790 #endif
791
792 preempt_enable();
793 }
794
795 seq_printf(m, "\n\tevents:\t");
796 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
797 seq_printf(m, "%lu ", totals.events[i]);
798 seq_printf(m, "\n\tbytes:\t");
799 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
800 seq_printf(m, "%Lu ", totals.bytes[i]);
801 #ifdef CONFIG_NFS_FSCACHE
802 if (nfss->options & NFS_OPTION_FSCACHE) {
803 seq_printf(m, "\n\tfsc:\t");
804 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
805 seq_printf(m, "%Lu ", totals.bytes[i]);
806 }
807 #endif
808 seq_printf(m, "\n");
809
810 rpc_print_iostats(m, nfss->client);
811
812 return 0;
813 }
814
815 /*
816 * Begin unmount by attempting to remove all automounted mountpoints we added
817 * in response to xdev traversals and referrals
818 */
819 static void nfs_umount_begin(struct super_block *sb)
820 {
821 struct nfs_server *server;
822 struct rpc_clnt *rpc;
823
824 server = NFS_SB(sb);
825 /* -EIO all pending I/O */
826 rpc = server->client_acl;
827 if (!IS_ERR(rpc))
828 rpc_killall_tasks(rpc);
829 rpc = server->client;
830 if (!IS_ERR(rpc))
831 rpc_killall_tasks(rpc);
832 }
833
834 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
835 {
836 struct nfs_parsed_mount_data *data;
837
838 data = kzalloc(sizeof(*data), GFP_KERNEL);
839 if (data) {
840 data->acregmin = NFS_DEF_ACREGMIN;
841 data->acregmax = NFS_DEF_ACREGMAX;
842 data->acdirmin = NFS_DEF_ACDIRMIN;
843 data->acdirmax = NFS_DEF_ACDIRMAX;
844 data->mount_server.port = NFS_UNSPEC_PORT;
845 data->nfs_server.port = NFS_UNSPEC_PORT;
846 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
847 data->auth_flavors[0] = RPC_AUTH_UNIX;
848 data->auth_flavor_len = 1;
849 data->version = version;
850 data->minorversion = 0;
851 }
852 return data;
853 }
854
855 /*
856 * Sanity-check a server address provided by the mount command.
857 *
858 * Address family must be initialized, and address must not be
859 * the ANY address for that family.
860 */
861 static int nfs_verify_server_address(struct sockaddr *addr)
862 {
863 switch (addr->sa_family) {
864 case AF_INET: {
865 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
866 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
867 }
868 case AF_INET6: {
869 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
870 return !ipv6_addr_any(sa);
871 }
872 }
873
874 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
875 return 0;
876 }
877
878 /*
879 * Select between a default port value and a user-specified port value.
880 * If a zero value is set, then autobind will be used.
881 */
882 static void nfs_set_port(struct sockaddr *sap, int *port,
883 const unsigned short default_port)
884 {
885 if (*port == NFS_UNSPEC_PORT)
886 *port = default_port;
887
888 rpc_set_port(sap, *port);
889 }
890
891 /*
892 * Sanity check the NFS transport protocol.
893 *
894 */
895 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
896 {
897 switch (mnt->nfs_server.protocol) {
898 case XPRT_TRANSPORT_UDP:
899 case XPRT_TRANSPORT_TCP:
900 case XPRT_TRANSPORT_RDMA:
901 break;
902 default:
903 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
904 }
905 }
906
907 /*
908 * For text based NFSv2/v3 mounts, the mount protocol transport default
909 * settings should depend upon the specified NFS transport.
910 */
911 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
912 {
913 nfs_validate_transport_protocol(mnt);
914
915 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
916 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
917 return;
918 switch (mnt->nfs_server.protocol) {
919 case XPRT_TRANSPORT_UDP:
920 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
921 break;
922 case XPRT_TRANSPORT_TCP:
923 case XPRT_TRANSPORT_RDMA:
924 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
925 }
926 }
927
928 /*
929 * Parse the value of the 'sec=' option.
930 */
931 static int nfs_parse_security_flavors(char *value,
932 struct nfs_parsed_mount_data *mnt)
933 {
934 substring_t args[MAX_OPT_ARGS];
935
936 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
937
938 switch (match_token(value, nfs_secflavor_tokens, args)) {
939 case Opt_sec_none:
940 mnt->auth_flavors[0] = RPC_AUTH_NULL;
941 break;
942 case Opt_sec_sys:
943 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
944 break;
945 case Opt_sec_krb5:
946 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
947 break;
948 case Opt_sec_krb5i:
949 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
950 break;
951 case Opt_sec_krb5p:
952 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
953 break;
954 case Opt_sec_lkey:
955 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
956 break;
957 case Opt_sec_lkeyi:
958 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
959 break;
960 case Opt_sec_lkeyp:
961 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
962 break;
963 case Opt_sec_spkm:
964 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
965 break;
966 case Opt_sec_spkmi:
967 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
968 break;
969 case Opt_sec_spkmp:
970 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
971 break;
972 default:
973 return 0;
974 }
975
976 mnt->auth_flavor_len = 1;
977 return 1;
978 }
979
980 /*
981 * Error-check and convert a string of mount options from user space into
982 * a data structure. The whole mount string is processed; bad options are
983 * skipped as they are encountered. If there were no errors, return 1;
984 * otherwise return 0 (zero).
985 */
986 static int nfs_parse_mount_options(char *raw,
987 struct nfs_parsed_mount_data *mnt)
988 {
989 char *p, *string, *secdata;
990 int rc, sloppy = 0, invalid_option = 0;
991 unsigned short protofamily = AF_UNSPEC;
992 unsigned short mountfamily = AF_UNSPEC;
993
994 if (!raw) {
995 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
996 return 1;
997 }
998 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
999
1000 secdata = alloc_secdata();
1001 if (!secdata)
1002 goto out_nomem;
1003
1004 rc = security_sb_copy_data(raw, secdata);
1005 if (rc)
1006 goto out_security_failure;
1007
1008 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1009 if (rc)
1010 goto out_security_failure;
1011
1012 free_secdata(secdata);
1013
1014 while ((p = strsep(&raw, ",")) != NULL) {
1015 substring_t args[MAX_OPT_ARGS];
1016 unsigned long option;
1017 int token;
1018
1019 if (!*p)
1020 continue;
1021
1022 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1023
1024 token = match_token(p, nfs_mount_option_tokens, args);
1025 switch (token) {
1026
1027 /*
1028 * boolean options: foo/nofoo
1029 */
1030 case Opt_soft:
1031 mnt->flags |= NFS_MOUNT_SOFT;
1032 break;
1033 case Opt_hard:
1034 mnt->flags &= ~NFS_MOUNT_SOFT;
1035 break;
1036 case Opt_posix:
1037 mnt->flags |= NFS_MOUNT_POSIX;
1038 break;
1039 case Opt_noposix:
1040 mnt->flags &= ~NFS_MOUNT_POSIX;
1041 break;
1042 case Opt_cto:
1043 mnt->flags &= ~NFS_MOUNT_NOCTO;
1044 break;
1045 case Opt_nocto:
1046 mnt->flags |= NFS_MOUNT_NOCTO;
1047 break;
1048 case Opt_ac:
1049 mnt->flags &= ~NFS_MOUNT_NOAC;
1050 break;
1051 case Opt_noac:
1052 mnt->flags |= NFS_MOUNT_NOAC;
1053 break;
1054 case Opt_lock:
1055 mnt->flags &= ~NFS_MOUNT_NONLM;
1056 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1057 NFS_MOUNT_LOCAL_FCNTL);
1058 break;
1059 case Opt_nolock:
1060 mnt->flags |= NFS_MOUNT_NONLM;
1061 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1062 NFS_MOUNT_LOCAL_FCNTL);
1063 break;
1064 case Opt_v2:
1065 mnt->flags &= ~NFS_MOUNT_VER3;
1066 mnt->version = 2;
1067 break;
1068 case Opt_v3:
1069 mnt->flags |= NFS_MOUNT_VER3;
1070 mnt->version = 3;
1071 break;
1072 case Opt_v4:
1073 mnt->flags &= ~NFS_MOUNT_VER3;
1074 mnt->version = 4;
1075 break;
1076 case Opt_udp:
1077 mnt->flags &= ~NFS_MOUNT_TCP;
1078 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1079 break;
1080 case Opt_tcp:
1081 mnt->flags |= NFS_MOUNT_TCP;
1082 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1083 break;
1084 case Opt_rdma:
1085 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1086 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1087 xprt_load_transport(p);
1088 break;
1089 case Opt_acl:
1090 mnt->flags &= ~NFS_MOUNT_NOACL;
1091 break;
1092 case Opt_noacl:
1093 mnt->flags |= NFS_MOUNT_NOACL;
1094 break;
1095 case Opt_rdirplus:
1096 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1097 break;
1098 case Opt_nordirplus:
1099 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1100 break;
1101 case Opt_sharecache:
1102 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1103 break;
1104 case Opt_nosharecache:
1105 mnt->flags |= NFS_MOUNT_UNSHARED;
1106 break;
1107 case Opt_resvport:
1108 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1109 break;
1110 case Opt_noresvport:
1111 mnt->flags |= NFS_MOUNT_NORESVPORT;
1112 break;
1113 case Opt_fscache:
1114 mnt->options |= NFS_OPTION_FSCACHE;
1115 kfree(mnt->fscache_uniq);
1116 mnt->fscache_uniq = NULL;
1117 break;
1118 case Opt_nofscache:
1119 mnt->options &= ~NFS_OPTION_FSCACHE;
1120 kfree(mnt->fscache_uniq);
1121 mnt->fscache_uniq = NULL;
1122 break;
1123
1124 /*
1125 * options that take numeric values
1126 */
1127 case Opt_port:
1128 string = match_strdup(args);
1129 if (string == NULL)
1130 goto out_nomem;
1131 rc = strict_strtoul(string, 10, &option);
1132 kfree(string);
1133 if (rc != 0 || option > USHRT_MAX)
1134 goto out_invalid_value;
1135 mnt->nfs_server.port = option;
1136 break;
1137 case Opt_rsize:
1138 string = match_strdup(args);
1139 if (string == NULL)
1140 goto out_nomem;
1141 rc = strict_strtoul(string, 10, &option);
1142 kfree(string);
1143 if (rc != 0)
1144 goto out_invalid_value;
1145 mnt->rsize = option;
1146 break;
1147 case Opt_wsize:
1148 string = match_strdup(args);
1149 if (string == NULL)
1150 goto out_nomem;
1151 rc = strict_strtoul(string, 10, &option);
1152 kfree(string);
1153 if (rc != 0)
1154 goto out_invalid_value;
1155 mnt->wsize = option;
1156 break;
1157 case Opt_bsize:
1158 string = match_strdup(args);
1159 if (string == NULL)
1160 goto out_nomem;
1161 rc = strict_strtoul(string, 10, &option);
1162 kfree(string);
1163 if (rc != 0)
1164 goto out_invalid_value;
1165 mnt->bsize = option;
1166 break;
1167 case Opt_timeo:
1168 string = match_strdup(args);
1169 if (string == NULL)
1170 goto out_nomem;
1171 rc = strict_strtoul(string, 10, &option);
1172 kfree(string);
1173 if (rc != 0 || option == 0)
1174 goto out_invalid_value;
1175 mnt->timeo = option;
1176 break;
1177 case Opt_retrans:
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 goto out_nomem;
1181 rc = strict_strtoul(string, 10, &option);
1182 kfree(string);
1183 if (rc != 0 || option == 0)
1184 goto out_invalid_value;
1185 mnt->retrans = option;
1186 break;
1187 case Opt_acregmin:
1188 string = match_strdup(args);
1189 if (string == NULL)
1190 goto out_nomem;
1191 rc = strict_strtoul(string, 10, &option);
1192 kfree(string);
1193 if (rc != 0)
1194 goto out_invalid_value;
1195 mnt->acregmin = option;
1196 break;
1197 case Opt_acregmax:
1198 string = match_strdup(args);
1199 if (string == NULL)
1200 goto out_nomem;
1201 rc = strict_strtoul(string, 10, &option);
1202 kfree(string);
1203 if (rc != 0)
1204 goto out_invalid_value;
1205 mnt->acregmax = option;
1206 break;
1207 case Opt_acdirmin:
1208 string = match_strdup(args);
1209 if (string == NULL)
1210 goto out_nomem;
1211 rc = strict_strtoul(string, 10, &option);
1212 kfree(string);
1213 if (rc != 0)
1214 goto out_invalid_value;
1215 mnt->acdirmin = option;
1216 break;
1217 case Opt_acdirmax:
1218 string = match_strdup(args);
1219 if (string == NULL)
1220 goto out_nomem;
1221 rc = strict_strtoul(string, 10, &option);
1222 kfree(string);
1223 if (rc != 0)
1224 goto out_invalid_value;
1225 mnt->acdirmax = option;
1226 break;
1227 case Opt_actimeo:
1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
1231 rc = strict_strtoul(string, 10, &option);
1232 kfree(string);
1233 if (rc != 0)
1234 goto out_invalid_value;
1235 mnt->acregmin = mnt->acregmax =
1236 mnt->acdirmin = mnt->acdirmax = option;
1237 break;
1238 case Opt_namelen:
1239 string = match_strdup(args);
1240 if (string == NULL)
1241 goto out_nomem;
1242 rc = strict_strtoul(string, 10, &option);
1243 kfree(string);
1244 if (rc != 0)
1245 goto out_invalid_value;
1246 mnt->namlen = option;
1247 break;
1248 case Opt_mountport:
1249 string = match_strdup(args);
1250 if (string == NULL)
1251 goto out_nomem;
1252 rc = strict_strtoul(string, 10, &option);
1253 kfree(string);
1254 if (rc != 0 || option > USHRT_MAX)
1255 goto out_invalid_value;
1256 mnt->mount_server.port = option;
1257 break;
1258 case Opt_mountvers:
1259 string = match_strdup(args);
1260 if (string == NULL)
1261 goto out_nomem;
1262 rc = strict_strtoul(string, 10, &option);
1263 kfree(string);
1264 if (rc != 0 ||
1265 option < NFS_MNT_VERSION ||
1266 option > NFS_MNT3_VERSION)
1267 goto out_invalid_value;
1268 mnt->mount_server.version = option;
1269 break;
1270 case Opt_nfsvers:
1271 string = match_strdup(args);
1272 if (string == NULL)
1273 goto out_nomem;
1274 rc = strict_strtoul(string, 10, &option);
1275 kfree(string);
1276 if (rc != 0)
1277 goto out_invalid_value;
1278 switch (option) {
1279 case NFS2_VERSION:
1280 mnt->flags &= ~NFS_MOUNT_VER3;
1281 mnt->version = 2;
1282 break;
1283 case NFS3_VERSION:
1284 mnt->flags |= NFS_MOUNT_VER3;
1285 mnt->version = 3;
1286 break;
1287 case NFS4_VERSION:
1288 mnt->flags &= ~NFS_MOUNT_VER3;
1289 mnt->version = 4;
1290 break;
1291 default:
1292 goto out_invalid_value;
1293 }
1294 break;
1295 case Opt_minorversion:
1296 string = match_strdup(args);
1297 if (string == NULL)
1298 goto out_nomem;
1299 rc = strict_strtoul(string, 10, &option);
1300 kfree(string);
1301 if (rc != 0)
1302 goto out_invalid_value;
1303 if (option > NFS4_MAX_MINOR_VERSION)
1304 goto out_invalid_value;
1305 mnt->minorversion = option;
1306 break;
1307
1308 /*
1309 * options that take text values
1310 */
1311 case Opt_sec:
1312 string = match_strdup(args);
1313 if (string == NULL)
1314 goto out_nomem;
1315 rc = nfs_parse_security_flavors(string, mnt);
1316 kfree(string);
1317 if (!rc) {
1318 dfprintk(MOUNT, "NFS: unrecognized "
1319 "security flavor\n");
1320 return 0;
1321 }
1322 break;
1323 case Opt_proto:
1324 string = match_strdup(args);
1325 if (string == NULL)
1326 goto out_nomem;
1327 token = match_token(string,
1328 nfs_xprt_protocol_tokens, args);
1329
1330 protofamily = AF_INET;
1331 switch (token) {
1332 case Opt_xprt_udp6:
1333 protofamily = AF_INET6;
1334 case Opt_xprt_udp:
1335 mnt->flags &= ~NFS_MOUNT_TCP;
1336 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1337 kfree(string);
1338 break;
1339 case Opt_xprt_tcp6:
1340 protofamily = AF_INET6;
1341 case Opt_xprt_tcp:
1342 mnt->flags |= NFS_MOUNT_TCP;
1343 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1344 kfree(string);
1345 break;
1346 case Opt_xprt_rdma:
1347 /* vector side protocols to TCP */
1348 mnt->flags |= NFS_MOUNT_TCP;
1349 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1350 xprt_load_transport(string);
1351 kfree(string);
1352 break;
1353 default:
1354 dfprintk(MOUNT, "NFS: unrecognized "
1355 "transport protocol\n");
1356 kfree(string);
1357 return 0;
1358 }
1359 break;
1360 case Opt_mountproto:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
1364 token = match_token(string,
1365 nfs_xprt_protocol_tokens, args);
1366 kfree(string);
1367
1368 mountfamily = AF_INET;
1369 switch (token) {
1370 case Opt_xprt_udp6:
1371 mountfamily = AF_INET6;
1372 case Opt_xprt_udp:
1373 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1374 break;
1375 case Opt_xprt_tcp6:
1376 mountfamily = AF_INET6;
1377 case Opt_xprt_tcp:
1378 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1379 break;
1380 case Opt_xprt_rdma: /* not used for side protocols */
1381 default:
1382 dfprintk(MOUNT, "NFS: unrecognized "
1383 "transport protocol\n");
1384 return 0;
1385 }
1386 break;
1387 case Opt_addr:
1388 string = match_strdup(args);
1389 if (string == NULL)
1390 goto out_nomem;
1391 mnt->nfs_server.addrlen =
1392 rpc_pton(string, strlen(string),
1393 (struct sockaddr *)
1394 &mnt->nfs_server.address,
1395 sizeof(mnt->nfs_server.address));
1396 kfree(string);
1397 if (mnt->nfs_server.addrlen == 0)
1398 goto out_invalid_address;
1399 break;
1400 case Opt_clientaddr:
1401 string = match_strdup(args);
1402 if (string == NULL)
1403 goto out_nomem;
1404 kfree(mnt->client_address);
1405 mnt->client_address = string;
1406 break;
1407 case Opt_mounthost:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 kfree(mnt->mount_server.hostname);
1412 mnt->mount_server.hostname = string;
1413 break;
1414 case Opt_mountaddr:
1415 string = match_strdup(args);
1416 if (string == NULL)
1417 goto out_nomem;
1418 mnt->mount_server.addrlen =
1419 rpc_pton(string, strlen(string),
1420 (struct sockaddr *)
1421 &mnt->mount_server.address,
1422 sizeof(mnt->mount_server.address));
1423 kfree(string);
1424 if (mnt->mount_server.addrlen == 0)
1425 goto out_invalid_address;
1426 break;
1427 case Opt_lookupcache:
1428 string = match_strdup(args);
1429 if (string == NULL)
1430 goto out_nomem;
1431 token = match_token(string,
1432 nfs_lookupcache_tokens, args);
1433 kfree(string);
1434 switch (token) {
1435 case Opt_lookupcache_all:
1436 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1437 break;
1438 case Opt_lookupcache_positive:
1439 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1440 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1441 break;
1442 case Opt_lookupcache_none:
1443 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1444 break;
1445 default:
1446 dfprintk(MOUNT, "NFS: invalid "
1447 "lookupcache argument\n");
1448 return 0;
1449 };
1450 break;
1451 case Opt_fscache_uniq:
1452 string = match_strdup(args);
1453 if (string == NULL)
1454 goto out_nomem;
1455 kfree(mnt->fscache_uniq);
1456 mnt->fscache_uniq = string;
1457 mnt->options |= NFS_OPTION_FSCACHE;
1458 break;
1459 case Opt_local_lock:
1460 string = match_strdup(args);
1461 if (string == NULL)
1462 goto out_nomem;
1463 token = match_token(string, nfs_local_lock_tokens,
1464 args);
1465 kfree(string);
1466 switch (token) {
1467 case Opt_local_lock_all:
1468 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1469 NFS_MOUNT_LOCAL_FCNTL);
1470 break;
1471 case Opt_local_lock_flock:
1472 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1473 break;
1474 case Opt_local_lock_posix:
1475 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1476 break;
1477 case Opt_local_lock_none:
1478 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1479 NFS_MOUNT_LOCAL_FCNTL);
1480 break;
1481 default:
1482 dfprintk(MOUNT, "NFS: invalid "
1483 "local_lock argument\n");
1484 return 0;
1485 };
1486 break;
1487
1488 /*
1489 * Special options
1490 */
1491 case Opt_sloppy:
1492 sloppy = 1;
1493 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1494 break;
1495 case Opt_userspace:
1496 case Opt_deprecated:
1497 dfprintk(MOUNT, "NFS: ignoring mount option "
1498 "'%s'\n", p);
1499 break;
1500
1501 default:
1502 invalid_option = 1;
1503 dfprintk(MOUNT, "NFS: unrecognized mount option "
1504 "'%s'\n", p);
1505 }
1506 }
1507
1508 if (!sloppy && invalid_option)
1509 return 0;
1510
1511 /*
1512 * verify that any proto=/mountproto= options match the address
1513 * familiies in the addr=/mountaddr= options.
1514 */
1515 if (protofamily != AF_UNSPEC &&
1516 protofamily != mnt->nfs_server.address.ss_family)
1517 goto out_proto_mismatch;
1518
1519 if (mountfamily != AF_UNSPEC) {
1520 if (mnt->mount_server.addrlen) {
1521 if (mountfamily != mnt->mount_server.address.ss_family)
1522 goto out_mountproto_mismatch;
1523 } else {
1524 if (mountfamily != mnt->nfs_server.address.ss_family)
1525 goto out_mountproto_mismatch;
1526 }
1527 }
1528
1529 return 1;
1530
1531 out_mountproto_mismatch:
1532 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1533 "option\n");
1534 return 0;
1535 out_proto_mismatch:
1536 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1537 return 0;
1538 out_invalid_address:
1539 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1540 return 0;
1541 out_invalid_value:
1542 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1543 return 0;
1544 out_nomem:
1545 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1546 return 0;
1547 out_security_failure:
1548 free_secdata(secdata);
1549 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1550 return 0;
1551 }
1552
1553 /*
1554 * Match the requested auth flavors with the list returned by
1555 * the server. Returns zero and sets the mount's authentication
1556 * flavor on success; returns -EACCES if server does not support
1557 * the requested flavor.
1558 */
1559 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1560 struct nfs_mount_request *request)
1561 {
1562 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1563
1564 /*
1565 * Certain releases of Linux's mountd return an empty
1566 * flavor list. To prevent behavioral regression with
1567 * these servers (ie. rejecting mounts that used to
1568 * succeed), revert to pre-2.6.32 behavior (no checking)
1569 * if the returned flavor list is empty.
1570 */
1571 if (server_authlist_len == 0)
1572 return 0;
1573
1574 /*
1575 * We avoid sophisticated negotiating here, as there are
1576 * plenty of cases where we can get it wrong, providing
1577 * either too little or too much security.
1578 *
1579 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1580 * flavor listed first. However, some servers list
1581 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1582 * preferred default, in args->auth_flavors[0] if user
1583 * didn't specify sec= mount option.
1584 */
1585 for (i = 0; i < args->auth_flavor_len; i++)
1586 for (j = 0; j < server_authlist_len; j++)
1587 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1588 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1589 request->auth_flavs[j]);
1590 args->auth_flavors[0] = request->auth_flavs[j];
1591 return 0;
1592 }
1593
1594 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1595 nfs_umount(request);
1596 return -EACCES;
1597 }
1598
1599 /*
1600 * Use the remote server's MOUNT service to request the NFS file handle
1601 * corresponding to the provided path.
1602 */
1603 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1604 struct nfs_fh *root_fh)
1605 {
1606 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1607 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1608 struct nfs_mount_request request = {
1609 .sap = (struct sockaddr *)
1610 &args->mount_server.address,
1611 .dirpath = args->nfs_server.export_path,
1612 .protocol = args->mount_server.protocol,
1613 .fh = root_fh,
1614 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1615 .auth_flav_len = &server_authlist_len,
1616 .auth_flavs = server_authlist,
1617 };
1618 int status;
1619
1620 if (args->mount_server.version == 0) {
1621 switch (args->version) {
1622 default:
1623 args->mount_server.version = NFS_MNT3_VERSION;
1624 break;
1625 case 2:
1626 args->mount_server.version = NFS_MNT_VERSION;
1627 }
1628 }
1629 request.version = args->mount_server.version;
1630
1631 if (args->mount_server.hostname)
1632 request.hostname = args->mount_server.hostname;
1633 else
1634 request.hostname = args->nfs_server.hostname;
1635
1636 /*
1637 * Construct the mount server's address.
1638 */
1639 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1640 memcpy(request.sap, &args->nfs_server.address,
1641 args->nfs_server.addrlen);
1642 args->mount_server.addrlen = args->nfs_server.addrlen;
1643 }
1644 request.salen = args->mount_server.addrlen;
1645 nfs_set_port(request.sap, &args->mount_server.port, 0);
1646
1647 /*
1648 * Now ask the mount server to map our export path
1649 * to a file handle.
1650 */
1651 status = nfs_mount(&request);
1652 if (status != 0) {
1653 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1654 request.hostname, status);
1655 return status;
1656 }
1657
1658 /*
1659 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1660 */
1661 if (args->mount_server.version != NFS_MNT3_VERSION)
1662 return 0;
1663 return nfs_walk_authlist(args, &request);
1664 }
1665
1666 static int nfs_parse_simple_hostname(const char *dev_name,
1667 char **hostname, size_t maxnamlen,
1668 char **export_path, size_t maxpathlen)
1669 {
1670 size_t len;
1671 char *colon, *comma;
1672
1673 colon = strchr(dev_name, ':');
1674 if (colon == NULL)
1675 goto out_bad_devname;
1676
1677 len = colon - dev_name;
1678 if (len > maxnamlen)
1679 goto out_hostname;
1680
1681 /* N.B. caller will free nfs_server.hostname in all cases */
1682 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1683 if (!*hostname)
1684 goto out_nomem;
1685
1686 /* kill possible hostname list: not supported */
1687 comma = strchr(*hostname, ',');
1688 if (comma != NULL) {
1689 if (comma == *hostname)
1690 goto out_bad_devname;
1691 *comma = '\0';
1692 }
1693
1694 colon++;
1695 len = strlen(colon);
1696 if (len > maxpathlen)
1697 goto out_path;
1698 *export_path = kstrndup(colon, len, GFP_KERNEL);
1699 if (!*export_path)
1700 goto out_nomem;
1701
1702 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1703 return 0;
1704
1705 out_bad_devname:
1706 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1707 return -EINVAL;
1708
1709 out_nomem:
1710 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1711 return -ENOMEM;
1712
1713 out_hostname:
1714 dfprintk(MOUNT, "NFS: server hostname too long\n");
1715 return -ENAMETOOLONG;
1716
1717 out_path:
1718 dfprintk(MOUNT, "NFS: export pathname too long\n");
1719 return -ENAMETOOLONG;
1720 }
1721
1722 /*
1723 * Hostname has square brackets around it because it contains one or
1724 * more colons. We look for the first closing square bracket, and a
1725 * colon must follow it.
1726 */
1727 static int nfs_parse_protected_hostname(const char *dev_name,
1728 char **hostname, size_t maxnamlen,
1729 char **export_path, size_t maxpathlen)
1730 {
1731 size_t len;
1732 char *start, *end;
1733
1734 start = (char *)(dev_name + 1);
1735
1736 end = strchr(start, ']');
1737 if (end == NULL)
1738 goto out_bad_devname;
1739 if (*(end + 1) != ':')
1740 goto out_bad_devname;
1741
1742 len = end - start;
1743 if (len > maxnamlen)
1744 goto out_hostname;
1745
1746 /* N.B. caller will free nfs_server.hostname in all cases */
1747 *hostname = kstrndup(start, len, GFP_KERNEL);
1748 if (*hostname == NULL)
1749 goto out_nomem;
1750
1751 end += 2;
1752 len = strlen(end);
1753 if (len > maxpathlen)
1754 goto out_path;
1755 *export_path = kstrndup(end, len, GFP_KERNEL);
1756 if (!*export_path)
1757 goto out_nomem;
1758
1759 return 0;
1760
1761 out_bad_devname:
1762 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1763 return -EINVAL;
1764
1765 out_nomem:
1766 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1767 return -ENOMEM;
1768
1769 out_hostname:
1770 dfprintk(MOUNT, "NFS: server hostname too long\n");
1771 return -ENAMETOOLONG;
1772
1773 out_path:
1774 dfprintk(MOUNT, "NFS: export pathname too long\n");
1775 return -ENAMETOOLONG;
1776 }
1777
1778 /*
1779 * Split "dev_name" into "hostname:export_path".
1780 *
1781 * The leftmost colon demarks the split between the server's hostname
1782 * and the export path. If the hostname starts with a left square
1783 * bracket, then it may contain colons.
1784 *
1785 * Note: caller frees hostname and export path, even on error.
1786 */
1787 static int nfs_parse_devname(const char *dev_name,
1788 char **hostname, size_t maxnamlen,
1789 char **export_path, size_t maxpathlen)
1790 {
1791 if (*dev_name == '[')
1792 return nfs_parse_protected_hostname(dev_name,
1793 hostname, maxnamlen,
1794 export_path, maxpathlen);
1795
1796 return nfs_parse_simple_hostname(dev_name,
1797 hostname, maxnamlen,
1798 export_path, maxpathlen);
1799 }
1800
1801 /*
1802 * Validate the NFS2/NFS3 mount data
1803 * - fills in the mount root filehandle
1804 *
1805 * For option strings, user space handles the following behaviors:
1806 *
1807 * + DNS: mapping server host name to IP address ("addr=" option)
1808 *
1809 * + failure mode: how to behave if a mount request can't be handled
1810 * immediately ("fg/bg" option)
1811 *
1812 * + retry: how often to retry a mount request ("retry=" option)
1813 *
1814 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1815 * mountproto=tcp after mountproto=udp, and so on
1816 */
1817 static int nfs_validate_mount_data(void *options,
1818 struct nfs_parsed_mount_data *args,
1819 struct nfs_fh *mntfh,
1820 const char *dev_name)
1821 {
1822 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1823 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1824
1825 if (data == NULL)
1826 goto out_no_data;
1827
1828 switch (data->version) {
1829 case 1:
1830 data->namlen = 0;
1831 case 2:
1832 data->bsize = 0;
1833 case 3:
1834 if (data->flags & NFS_MOUNT_VER3)
1835 goto out_no_v3;
1836 data->root.size = NFS2_FHSIZE;
1837 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1838 case 4:
1839 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1840 goto out_no_sec;
1841 case 5:
1842 memset(data->context, 0, sizeof(data->context));
1843 case 6:
1844 if (data->flags & NFS_MOUNT_VER3) {
1845 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1846 goto out_invalid_fh;
1847 mntfh->size = data->root.size;
1848 args->version = 3;
1849 } else {
1850 mntfh->size = NFS2_FHSIZE;
1851 args->version = 2;
1852 }
1853
1854
1855 memcpy(mntfh->data, data->root.data, mntfh->size);
1856 if (mntfh->size < sizeof(mntfh->data))
1857 memset(mntfh->data + mntfh->size, 0,
1858 sizeof(mntfh->data) - mntfh->size);
1859
1860 /*
1861 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1862 * can deal with.
1863 */
1864 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1865 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1866 args->rsize = data->rsize;
1867 args->wsize = data->wsize;
1868 args->timeo = data->timeo;
1869 args->retrans = data->retrans;
1870 args->acregmin = data->acregmin;
1871 args->acregmax = data->acregmax;
1872 args->acdirmin = data->acdirmin;
1873 args->acdirmax = data->acdirmax;
1874
1875 memcpy(sap, &data->addr, sizeof(data->addr));
1876 args->nfs_server.addrlen = sizeof(data->addr);
1877 if (!nfs_verify_server_address(sap))
1878 goto out_no_address;
1879
1880 if (!(data->flags & NFS_MOUNT_TCP))
1881 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1882 /* N.B. caller will free nfs_server.hostname in all cases */
1883 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1884 args->namlen = data->namlen;
1885 args->bsize = data->bsize;
1886
1887 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1888 args->auth_flavors[0] = data->pseudoflavor;
1889 if (!args->nfs_server.hostname)
1890 goto out_nomem;
1891
1892 if (!(data->flags & NFS_MOUNT_NONLM))
1893 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1894 NFS_MOUNT_LOCAL_FCNTL);
1895 else
1896 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1897 NFS_MOUNT_LOCAL_FCNTL);
1898 /*
1899 * The legacy version 6 binary mount data from userspace has a
1900 * field used only to transport selinux information into the
1901 * the kernel. To continue to support that functionality we
1902 * have a touch of selinux knowledge here in the NFS code. The
1903 * userspace code converted context=blah to just blah so we are
1904 * converting back to the full string selinux understands.
1905 */
1906 if (data->context[0]){
1907 #ifdef CONFIG_SECURITY_SELINUX
1908 int rc;
1909 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1910 if (!opts_str)
1911 return -ENOMEM;
1912 strcpy(opts_str, "context=");
1913 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1914 strcat(opts_str, &data->context[0]);
1915 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1916 kfree(opts_str);
1917 if (rc)
1918 return rc;
1919 #else
1920 return -EINVAL;
1921 #endif
1922 }
1923
1924 break;
1925 default: {
1926 int status;
1927
1928 if (nfs_parse_mount_options((char *)options, args) == 0)
1929 return -EINVAL;
1930
1931 if (!nfs_verify_server_address(sap))
1932 goto out_no_address;
1933
1934 if (args->version == 4)
1935 #ifdef CONFIG_NFS_V4
1936 return nfs4_validate_text_mount_data(options,
1937 args, dev_name);
1938 #else
1939 goto out_v4_not_compiled;
1940 #endif
1941
1942 nfs_set_port(sap, &args->nfs_server.port, 0);
1943
1944 nfs_set_mount_transport_protocol(args);
1945
1946 status = nfs_parse_devname(dev_name,
1947 &args->nfs_server.hostname,
1948 PAGE_SIZE,
1949 &args->nfs_server.export_path,
1950 NFS_MAXPATHLEN);
1951 if (!status)
1952 status = nfs_try_mount(args, mntfh);
1953
1954 kfree(args->nfs_server.export_path);
1955 args->nfs_server.export_path = NULL;
1956
1957 if (status)
1958 return status;
1959
1960 break;
1961 }
1962 }
1963
1964 #ifndef CONFIG_NFS_V3
1965 if (args->version == 3)
1966 goto out_v3_not_compiled;
1967 #endif /* !CONFIG_NFS_V3 */
1968
1969 return 0;
1970
1971 out_no_data:
1972 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1973 return -EINVAL;
1974
1975 out_no_v3:
1976 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1977 data->version);
1978 return -EINVAL;
1979
1980 out_no_sec:
1981 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1982 return -EINVAL;
1983
1984 #ifndef CONFIG_NFS_V3
1985 out_v3_not_compiled:
1986 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1987 return -EPROTONOSUPPORT;
1988 #endif /* !CONFIG_NFS_V3 */
1989
1990 #ifndef CONFIG_NFS_V4
1991 out_v4_not_compiled:
1992 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1993 return -EPROTONOSUPPORT;
1994 #endif /* !CONFIG_NFS_V4 */
1995
1996 out_nomem:
1997 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1998 return -ENOMEM;
1999
2000 out_no_address:
2001 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2002 return -EINVAL;
2003
2004 out_invalid_fh:
2005 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2006 return -EINVAL;
2007 }
2008
2009 static int
2010 nfs_compare_remount_data(struct nfs_server *nfss,
2011 struct nfs_parsed_mount_data *data)
2012 {
2013 if (data->flags != nfss->flags ||
2014 data->rsize != nfss->rsize ||
2015 data->wsize != nfss->wsize ||
2016 data->retrans != nfss->client->cl_timeout->to_retries ||
2017 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2018 data->acregmin != nfss->acregmin / HZ ||
2019 data->acregmax != nfss->acregmax / HZ ||
2020 data->acdirmin != nfss->acdirmin / HZ ||
2021 data->acdirmax != nfss->acdirmax / HZ ||
2022 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2023 data->nfs_server.port != nfss->port ||
2024 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2025 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2026 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2027 return -EINVAL;
2028
2029 return 0;
2030 }
2031
2032 static int
2033 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2034 {
2035 int error;
2036 struct nfs_server *nfss = sb->s_fs_info;
2037 struct nfs_parsed_mount_data *data;
2038 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2039 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2040 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2041
2042 /*
2043 * Userspace mount programs that send binary options generally send
2044 * them populated with default values. We have no way to know which
2045 * ones were explicitly specified. Fall back to legacy behavior and
2046 * just return success.
2047 */
2048 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2049 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2050 options->version <= 6))))
2051 return 0;
2052
2053 data = kzalloc(sizeof(*data), GFP_KERNEL);
2054 if (data == NULL)
2055 return -ENOMEM;
2056
2057 /* fill out struct with values from existing mount */
2058 data->flags = nfss->flags;
2059 data->rsize = nfss->rsize;
2060 data->wsize = nfss->wsize;
2061 data->retrans = nfss->client->cl_timeout->to_retries;
2062 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2063 data->acregmin = nfss->acregmin / HZ;
2064 data->acregmax = nfss->acregmax / HZ;
2065 data->acdirmin = nfss->acdirmin / HZ;
2066 data->acdirmax = nfss->acdirmax / HZ;
2067 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2068 data->nfs_server.port = nfss->port;
2069 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2070 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2071 data->nfs_server.addrlen);
2072
2073 /* overwrite those values with any that were specified */
2074 error = nfs_parse_mount_options((char *)options, data);
2075 if (error < 0)
2076 goto out;
2077
2078 /* compare new mount options with old ones */
2079 error = nfs_compare_remount_data(nfss, data);
2080 out:
2081 kfree(data);
2082 return error;
2083 }
2084
2085 /*
2086 * Initialise the common bits of the superblock
2087 */
2088 static inline void nfs_initialise_sb(struct super_block *sb)
2089 {
2090 struct nfs_server *server = NFS_SB(sb);
2091
2092 sb->s_magic = NFS_SUPER_MAGIC;
2093
2094 /* We probably want something more informative here */
2095 snprintf(sb->s_id, sizeof(sb->s_id),
2096 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2097
2098 if (sb->s_blocksize == 0)
2099 sb->s_blocksize = nfs_block_bits(server->wsize,
2100 &sb->s_blocksize_bits);
2101
2102 if (server->flags & NFS_MOUNT_NOAC)
2103 sb->s_flags |= MS_SYNCHRONOUS;
2104
2105 sb->s_bdi = &server->backing_dev_info;
2106
2107 nfs_super_set_maxbytes(sb, server->maxfilesize);
2108 }
2109
2110 /*
2111 * Finish setting up an NFS2/3 superblock
2112 */
2113 static void nfs_fill_super(struct super_block *sb,
2114 struct nfs_parsed_mount_data *data)
2115 {
2116 struct nfs_server *server = NFS_SB(sb);
2117
2118 sb->s_blocksize_bits = 0;
2119 sb->s_blocksize = 0;
2120 if (data->bsize)
2121 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2122
2123 if (server->nfs_client->rpc_ops->version == 3) {
2124 /* The VFS shouldn't apply the umask to mode bits. We will do
2125 * so ourselves when necessary.
2126 */
2127 sb->s_flags |= MS_POSIXACL;
2128 sb->s_time_gran = 1;
2129 }
2130
2131 sb->s_op = &nfs_sops;
2132 nfs_initialise_sb(sb);
2133 }
2134
2135 /*
2136 * Finish setting up a cloned NFS2/3 superblock
2137 */
2138 static void nfs_clone_super(struct super_block *sb,
2139 const struct super_block *old_sb)
2140 {
2141 struct nfs_server *server = NFS_SB(sb);
2142
2143 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2144 sb->s_blocksize = old_sb->s_blocksize;
2145 sb->s_maxbytes = old_sb->s_maxbytes;
2146
2147 if (server->nfs_client->rpc_ops->version == 3) {
2148 /* The VFS shouldn't apply the umask to mode bits. We will do
2149 * so ourselves when necessary.
2150 */
2151 sb->s_flags |= MS_POSIXACL;
2152 sb->s_time_gran = 1;
2153 }
2154
2155 sb->s_op = old_sb->s_op;
2156 nfs_initialise_sb(sb);
2157 }
2158
2159 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2160 {
2161 const struct nfs_server *a = s->s_fs_info;
2162 const struct rpc_clnt *clnt_a = a->client;
2163 const struct rpc_clnt *clnt_b = b->client;
2164
2165 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2166 goto Ebusy;
2167 if (a->nfs_client != b->nfs_client)
2168 goto Ebusy;
2169 if (a->flags != b->flags)
2170 goto Ebusy;
2171 if (a->wsize != b->wsize)
2172 goto Ebusy;
2173 if (a->rsize != b->rsize)
2174 goto Ebusy;
2175 if (a->acregmin != b->acregmin)
2176 goto Ebusy;
2177 if (a->acregmax != b->acregmax)
2178 goto Ebusy;
2179 if (a->acdirmin != b->acdirmin)
2180 goto Ebusy;
2181 if (a->acdirmax != b->acdirmax)
2182 goto Ebusy;
2183 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2184 goto Ebusy;
2185 return 1;
2186 Ebusy:
2187 return 0;
2188 }
2189
2190 struct nfs_sb_mountdata {
2191 struct nfs_server *server;
2192 int mntflags;
2193 };
2194
2195 static int nfs_set_super(struct super_block *s, void *data)
2196 {
2197 struct nfs_sb_mountdata *sb_mntdata = data;
2198 struct nfs_server *server = sb_mntdata->server;
2199 int ret;
2200
2201 s->s_flags = sb_mntdata->mntflags;
2202 s->s_fs_info = server;
2203 ret = set_anon_super(s, server);
2204 if (ret == 0)
2205 server->s_dev = s->s_dev;
2206 return ret;
2207 }
2208
2209 static int nfs_compare_super_address(struct nfs_server *server1,
2210 struct nfs_server *server2)
2211 {
2212 struct sockaddr *sap1, *sap2;
2213
2214 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2215 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2216
2217 if (sap1->sa_family != sap2->sa_family)
2218 return 0;
2219
2220 switch (sap1->sa_family) {
2221 case AF_INET: {
2222 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2223 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2224 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2225 return 0;
2226 if (sin1->sin_port != sin2->sin_port)
2227 return 0;
2228 break;
2229 }
2230 case AF_INET6: {
2231 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2232 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2233 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2234 return 0;
2235 if (sin1->sin6_port != sin2->sin6_port)
2236 return 0;
2237 break;
2238 }
2239 default:
2240 return 0;
2241 }
2242
2243 return 1;
2244 }
2245
2246 static int nfs_compare_super(struct super_block *sb, void *data)
2247 {
2248 struct nfs_sb_mountdata *sb_mntdata = data;
2249 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2250 int mntflags = sb_mntdata->mntflags;
2251
2252 if (!nfs_compare_super_address(old, server))
2253 return 0;
2254 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2255 if (old->flags & NFS_MOUNT_UNSHARED)
2256 return 0;
2257 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2258 return 0;
2259 return nfs_compare_mount_options(sb, server, mntflags);
2260 }
2261
2262 static int nfs_bdi_register(struct nfs_server *server)
2263 {
2264 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2265 }
2266
2267 static int nfs_get_sb(struct file_system_type *fs_type,
2268 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2269 {
2270 struct nfs_server *server = NULL;
2271 struct super_block *s;
2272 struct nfs_parsed_mount_data *data;
2273 struct nfs_fh *mntfh;
2274 struct dentry *mntroot;
2275 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2276 struct nfs_sb_mountdata sb_mntdata = {
2277 .mntflags = flags,
2278 };
2279 int error = -ENOMEM;
2280
2281 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2282 mntfh = nfs_alloc_fhandle();
2283 if (data == NULL || mntfh == NULL)
2284 goto out_free_fh;
2285
2286 security_init_mnt_opts(&data->lsm_opts);
2287
2288 /* Validate the mount data */
2289 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2290 if (error < 0)
2291 goto out;
2292
2293 #ifdef CONFIG_NFS_V4
2294 if (data->version == 4) {
2295 error = nfs4_try_mount(flags, dev_name, data, mnt);
2296 kfree(data->client_address);
2297 kfree(data->nfs_server.export_path);
2298 goto out;
2299 }
2300 #endif /* CONFIG_NFS_V4 */
2301
2302 /* Get a volume representation */
2303 server = nfs_create_server(data, mntfh);
2304 if (IS_ERR(server)) {
2305 error = PTR_ERR(server);
2306 goto out;
2307 }
2308 sb_mntdata.server = server;
2309
2310 if (server->flags & NFS_MOUNT_UNSHARED)
2311 compare_super = NULL;
2312
2313 /* Get a superblock - note that we may end up sharing one that already exists */
2314 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2315 if (IS_ERR(s)) {
2316 error = PTR_ERR(s);
2317 goto out_err_nosb;
2318 }
2319
2320 if (s->s_fs_info != server) {
2321 nfs_free_server(server);
2322 server = NULL;
2323 } else {
2324 error = nfs_bdi_register(server);
2325 if (error)
2326 goto error_splat_bdi;
2327 }
2328
2329 if (!s->s_root) {
2330 /* initial superblock/root creation */
2331 nfs_fill_super(s, data);
2332 nfs_fscache_get_super_cookie(
2333 s, data ? data->fscache_uniq : NULL, NULL);
2334 }
2335
2336 mntroot = nfs_get_root(s, mntfh);
2337 if (IS_ERR(mntroot)) {
2338 error = PTR_ERR(mntroot);
2339 goto error_splat_super;
2340 }
2341
2342 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2343 if (error)
2344 goto error_splat_root;
2345
2346 s->s_flags |= MS_ACTIVE;
2347 mnt->mnt_sb = s;
2348 mnt->mnt_root = mntroot;
2349 error = 0;
2350
2351 out:
2352 kfree(data->nfs_server.hostname);
2353 kfree(data->mount_server.hostname);
2354 kfree(data->fscache_uniq);
2355 security_free_mnt_opts(&data->lsm_opts);
2356 out_free_fh:
2357 nfs_free_fhandle(mntfh);
2358 kfree(data);
2359 return error;
2360
2361 out_err_nosb:
2362 nfs_free_server(server);
2363 goto out;
2364
2365 error_splat_root:
2366 dput(mntroot);
2367 error_splat_super:
2368 if (server && !s->s_root)
2369 bdi_unregister(&server->backing_dev_info);
2370 error_splat_bdi:
2371 deactivate_locked_super(s);
2372 goto out;
2373 }
2374
2375 /*
2376 * Ensure that we unregister the bdi before kill_anon_super
2377 * releases the device name
2378 */
2379 static void nfs_put_super(struct super_block *s)
2380 {
2381 struct nfs_server *server = NFS_SB(s);
2382
2383 bdi_unregister(&server->backing_dev_info);
2384 }
2385
2386 /*
2387 * Destroy an NFS2/3 superblock
2388 */
2389 static void nfs_kill_super(struct super_block *s)
2390 {
2391 struct nfs_server *server = NFS_SB(s);
2392
2393 kill_anon_super(s);
2394 nfs_fscache_release_super_cookie(s);
2395 nfs_free_server(server);
2396 }
2397
2398 /*
2399 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2400 */
2401 static struct dentry *
2402 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2403 const char *dev_name, void *raw_data)
2404 {
2405 struct nfs_clone_mount *data = raw_data;
2406 struct super_block *s;
2407 struct nfs_server *server;
2408 struct dentry *mntroot;
2409 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2410 struct nfs_sb_mountdata sb_mntdata = {
2411 .mntflags = flags,
2412 };
2413 int error;
2414
2415 dprintk("--> nfs_xdev_mount()\n");
2416
2417 /* create a new volume representation */
2418 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2419 if (IS_ERR(server)) {
2420 error = PTR_ERR(server);
2421 goto out_err_noserver;
2422 }
2423 sb_mntdata.server = server;
2424
2425 if (server->flags & NFS_MOUNT_UNSHARED)
2426 compare_super = NULL;
2427
2428 /* Get a superblock - note that we may end up sharing one that already exists */
2429 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2430 if (IS_ERR(s)) {
2431 error = PTR_ERR(s);
2432 goto out_err_nosb;
2433 }
2434
2435 if (s->s_fs_info != server) {
2436 nfs_free_server(server);
2437 server = NULL;
2438 } else {
2439 error = nfs_bdi_register(server);
2440 if (error)
2441 goto error_splat_bdi;
2442 }
2443
2444 if (!s->s_root) {
2445 /* initial superblock/root creation */
2446 nfs_clone_super(s, data->sb);
2447 nfs_fscache_get_super_cookie(s, NULL, data);
2448 }
2449
2450 mntroot = nfs_get_root(s, data->fh);
2451 if (IS_ERR(mntroot)) {
2452 error = PTR_ERR(mntroot);
2453 goto error_splat_super;
2454 }
2455 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2456 dput(mntroot);
2457 error = -ESTALE;
2458 goto error_splat_super;
2459 }
2460
2461 s->s_flags |= MS_ACTIVE;
2462
2463 /* clone any lsm security options from the parent to the new sb */
2464 security_sb_clone_mnt_opts(data->sb, s);
2465
2466 dprintk("<-- nfs_xdev_mount() = 0\n");
2467 return mntroot;
2468
2469 out_err_nosb:
2470 nfs_free_server(server);
2471 out_err_noserver:
2472 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2473 return ERR_PTR(error);
2474
2475 error_splat_super:
2476 if (server && !s->s_root)
2477 bdi_unregister(&server->backing_dev_info);
2478 error_splat_bdi:
2479 deactivate_locked_super(s);
2480 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2481 return ERR_PTR(error);
2482 }
2483
2484 #ifdef CONFIG_NFS_V4
2485
2486 /*
2487 * Finish setting up a cloned NFS4 superblock
2488 */
2489 static void nfs4_clone_super(struct super_block *sb,
2490 const struct super_block *old_sb)
2491 {
2492 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2493 sb->s_blocksize = old_sb->s_blocksize;
2494 sb->s_maxbytes = old_sb->s_maxbytes;
2495 sb->s_time_gran = 1;
2496 sb->s_op = old_sb->s_op;
2497 nfs_initialise_sb(sb);
2498 }
2499
2500 /*
2501 * Set up an NFS4 superblock
2502 */
2503 static void nfs4_fill_super(struct super_block *sb)
2504 {
2505 sb->s_time_gran = 1;
2506 sb->s_op = &nfs4_sops;
2507 nfs_initialise_sb(sb);
2508 }
2509
2510 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2511 {
2512 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2513 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2514 }
2515
2516 static int nfs4_validate_text_mount_data(void *options,
2517 struct nfs_parsed_mount_data *args,
2518 const char *dev_name)
2519 {
2520 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2521
2522 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2523
2524 nfs_validate_transport_protocol(args);
2525
2526 nfs4_validate_mount_flags(args);
2527
2528 if (args->version != 4) {
2529 dfprintk(MOUNT,
2530 "NFS4: Illegal mount version\n");
2531 return -EINVAL;
2532 }
2533
2534 if (args->auth_flavor_len > 1) {
2535 dfprintk(MOUNT,
2536 "NFS4: Too many RPC auth flavours specified\n");
2537 return -EINVAL;
2538 }
2539
2540 if (args->client_address == NULL) {
2541 dfprintk(MOUNT,
2542 "NFS4: mount program didn't pass callback address\n");
2543 return -EINVAL;
2544 }
2545
2546 return nfs_parse_devname(dev_name,
2547 &args->nfs_server.hostname,
2548 NFS4_MAXNAMLEN,
2549 &args->nfs_server.export_path,
2550 NFS4_MAXPATHLEN);
2551 }
2552
2553 /*
2554 * Validate NFSv4 mount options
2555 */
2556 static int nfs4_validate_mount_data(void *options,
2557 struct nfs_parsed_mount_data *args,
2558 const char *dev_name)
2559 {
2560 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2561 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2562 char *c;
2563
2564 if (data == NULL)
2565 goto out_no_data;
2566
2567 switch (data->version) {
2568 case 1:
2569 if (data->host_addrlen > sizeof(args->nfs_server.address))
2570 goto out_no_address;
2571 if (data->host_addrlen == 0)
2572 goto out_no_address;
2573 args->nfs_server.addrlen = data->host_addrlen;
2574 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2575 return -EFAULT;
2576 if (!nfs_verify_server_address(sap))
2577 goto out_no_address;
2578
2579 if (data->auth_flavourlen) {
2580 if (data->auth_flavourlen > 1)
2581 goto out_inval_auth;
2582 if (copy_from_user(&args->auth_flavors[0],
2583 data->auth_flavours,
2584 sizeof(args->auth_flavors[0])))
2585 return -EFAULT;
2586 }
2587
2588 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2589 if (IS_ERR(c))
2590 return PTR_ERR(c);
2591 args->nfs_server.hostname = c;
2592
2593 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2594 if (IS_ERR(c))
2595 return PTR_ERR(c);
2596 args->nfs_server.export_path = c;
2597 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2598
2599 c = strndup_user(data->client_addr.data, 16);
2600 if (IS_ERR(c))
2601 return PTR_ERR(c);
2602 args->client_address = c;
2603
2604 /*
2605 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2606 * can deal with.
2607 */
2608
2609 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2610 args->rsize = data->rsize;
2611 args->wsize = data->wsize;
2612 args->timeo = data->timeo;
2613 args->retrans = data->retrans;
2614 args->acregmin = data->acregmin;
2615 args->acregmax = data->acregmax;
2616 args->acdirmin = data->acdirmin;
2617 args->acdirmax = data->acdirmax;
2618 args->nfs_server.protocol = data->proto;
2619 nfs_validate_transport_protocol(args);
2620
2621 break;
2622 default:
2623 if (nfs_parse_mount_options((char *)options, args) == 0)
2624 return -EINVAL;
2625
2626 if (!nfs_verify_server_address(sap))
2627 return -EINVAL;
2628
2629 return nfs4_validate_text_mount_data(options, args, dev_name);
2630 }
2631
2632 return 0;
2633
2634 out_no_data:
2635 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2636 return -EINVAL;
2637
2638 out_inval_auth:
2639 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2640 data->auth_flavourlen);
2641 return -EINVAL;
2642
2643 out_no_address:
2644 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2645 return -EINVAL;
2646 }
2647
2648 /*
2649 * Get the superblock for the NFS4 root partition
2650 */
2651 static struct dentry *
2652 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2653 const char *dev_name, void *raw_data)
2654 {
2655 struct nfs_parsed_mount_data *data = raw_data;
2656 struct super_block *s;
2657 struct nfs_server *server;
2658 struct nfs_fh *mntfh;
2659 struct dentry *mntroot;
2660 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2661 struct nfs_sb_mountdata sb_mntdata = {
2662 .mntflags = flags,
2663 };
2664 int error = -ENOMEM;
2665
2666 mntfh = nfs_alloc_fhandle();
2667 if (data == NULL || mntfh == NULL)
2668 goto out_free_fh;
2669
2670 security_init_mnt_opts(&data->lsm_opts);
2671
2672 /* Get a volume representation */
2673 server = nfs4_create_server(data, mntfh);
2674 if (IS_ERR(server)) {
2675 error = PTR_ERR(server);
2676 goto out;
2677 }
2678 sb_mntdata.server = server;
2679
2680 if (server->flags & NFS4_MOUNT_UNSHARED)
2681 compare_super = NULL;
2682
2683 /* Get a superblock - note that we may end up sharing one that already exists */
2684 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2685 if (IS_ERR(s)) {
2686 error = PTR_ERR(s);
2687 goto out_free;
2688 }
2689
2690 if (s->s_fs_info != server) {
2691 nfs_free_server(server);
2692 server = NULL;
2693 } else {
2694 error = nfs_bdi_register(server);
2695 if (error)
2696 goto error_splat_bdi;
2697 }
2698
2699 if (!s->s_root) {
2700 /* initial superblock/root creation */
2701 nfs4_fill_super(s);
2702 nfs_fscache_get_super_cookie(
2703 s, data ? data->fscache_uniq : NULL, NULL);
2704 }
2705
2706 mntroot = nfs4_get_root(s, mntfh);
2707 if (IS_ERR(mntroot)) {
2708 error = PTR_ERR(mntroot);
2709 goto error_splat_super;
2710 }
2711
2712 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2713 if (error)
2714 goto error_splat_root;
2715
2716 s->s_flags |= MS_ACTIVE;
2717
2718 security_free_mnt_opts(&data->lsm_opts);
2719 nfs_free_fhandle(mntfh);
2720 return mntroot;
2721
2722 out:
2723 security_free_mnt_opts(&data->lsm_opts);
2724 out_free_fh:
2725 nfs_free_fhandle(mntfh);
2726 return ERR_PTR(error);
2727
2728 out_free:
2729 nfs_free_server(server);
2730 goto out;
2731
2732 error_splat_root:
2733 dput(mntroot);
2734 error_splat_super:
2735 if (server && !s->s_root)
2736 bdi_unregister(&server->backing_dev_info);
2737 error_splat_bdi:
2738 deactivate_locked_super(s);
2739 goto out;
2740 }
2741
2742 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2743 int flags, void *data, const char *hostname)
2744 {
2745 struct vfsmount *root_mnt;
2746 char *root_devname;
2747 size_t len;
2748
2749 len = strlen(hostname) + 3;
2750 root_devname = kmalloc(len, GFP_KERNEL);
2751 if (root_devname == NULL)
2752 return ERR_PTR(-ENOMEM);
2753 snprintf(root_devname, len, "%s:/", hostname);
2754 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2755 kfree(root_devname);
2756 return root_mnt;
2757 }
2758
2759 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2760 {
2761 char *page = (char *) __get_free_page(GFP_KERNEL);
2762 char *devname, *tmp;
2763
2764 if (page == NULL)
2765 return;
2766 devname = nfs_path(path->mnt->mnt_devname,
2767 path->mnt->mnt_root, path->dentry,
2768 page, PAGE_SIZE);
2769 if (IS_ERR(devname))
2770 goto out_freepage;
2771 tmp = kstrdup(devname, GFP_KERNEL);
2772 if (tmp == NULL)
2773 goto out_freepage;
2774 kfree(mnt->mnt_devname);
2775 mnt->mnt_devname = tmp;
2776 out_freepage:
2777 free_page((unsigned long)page);
2778 }
2779
2780 struct nfs_referral_count {
2781 struct list_head list;
2782 const struct task_struct *task;
2783 unsigned int referral_count;
2784 };
2785
2786 static LIST_HEAD(nfs_referral_count_list);
2787 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2788
2789 static struct nfs_referral_count *nfs_find_referral_count(void)
2790 {
2791 struct nfs_referral_count *p;
2792
2793 list_for_each_entry(p, &nfs_referral_count_list, list) {
2794 if (p->task == current)
2795 return p;
2796 }
2797 return NULL;
2798 }
2799
2800 #define NFS_MAX_NESTED_REFERRALS 2
2801
2802 static int nfs_referral_loop_protect(void)
2803 {
2804 struct nfs_referral_count *p, *new;
2805 int ret = -ENOMEM;
2806
2807 new = kmalloc(sizeof(*new), GFP_KERNEL);
2808 if (!new)
2809 goto out;
2810 new->task = current;
2811 new->referral_count = 1;
2812
2813 ret = 0;
2814 spin_lock(&nfs_referral_count_list_lock);
2815 p = nfs_find_referral_count();
2816 if (p != NULL) {
2817 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2818 ret = -ELOOP;
2819 else
2820 p->referral_count++;
2821 } else {
2822 list_add(&new->list, &nfs_referral_count_list);
2823 new = NULL;
2824 }
2825 spin_unlock(&nfs_referral_count_list_lock);
2826 kfree(new);
2827 out:
2828 return ret;
2829 }
2830
2831 static void nfs_referral_loop_unprotect(void)
2832 {
2833 struct nfs_referral_count *p;
2834
2835 spin_lock(&nfs_referral_count_list_lock);
2836 p = nfs_find_referral_count();
2837 p->referral_count--;
2838 if (p->referral_count == 0)
2839 list_del(&p->list);
2840 else
2841 p = NULL;
2842 spin_unlock(&nfs_referral_count_list_lock);
2843 kfree(p);
2844 }
2845
2846 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2847 const char *export_path, struct vfsmount *mnt_target)
2848 {
2849 struct nameidata *nd = NULL;
2850 struct mnt_namespace *ns_private;
2851 struct super_block *s;
2852 int ret;
2853
2854 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2855 if (nd == NULL)
2856 return -ENOMEM;
2857
2858 ns_private = create_mnt_ns(root_mnt);
2859 ret = PTR_ERR(ns_private);
2860 if (IS_ERR(ns_private))
2861 goto out_mntput;
2862
2863 ret = nfs_referral_loop_protect();
2864 if (ret != 0)
2865 goto out_put_mnt_ns;
2866
2867 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2868 export_path, LOOKUP_FOLLOW, nd);
2869
2870 nfs_referral_loop_unprotect();
2871 put_mnt_ns(ns_private);
2872
2873 if (ret != 0)
2874 goto out_err;
2875
2876 s = nd->path.mnt->mnt_sb;
2877 atomic_inc(&s->s_active);
2878 mnt_target->mnt_sb = s;
2879 mnt_target->mnt_root = dget(nd->path.dentry);
2880
2881 /* Correct the device pathname */
2882 nfs_fix_devname(&nd->path, mnt_target);
2883
2884 path_put(&nd->path);
2885 kfree(nd);
2886 down_write(&s->s_umount);
2887 return 0;
2888 out_put_mnt_ns:
2889 put_mnt_ns(ns_private);
2890 out_mntput:
2891 mntput(root_mnt);
2892 out_err:
2893 kfree(nd);
2894 return ret;
2895 }
2896
2897 static int nfs4_try_mount(int flags, const char *dev_name,
2898 struct nfs_parsed_mount_data *data,
2899 struct vfsmount *mnt)
2900 {
2901 char *export_path;
2902 struct vfsmount *root_mnt;
2903 int error;
2904
2905 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2906
2907 export_path = data->nfs_server.export_path;
2908 data->nfs_server.export_path = "/";
2909 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2910 data->nfs_server.hostname);
2911 data->nfs_server.export_path = export_path;
2912
2913 error = PTR_ERR(root_mnt);
2914 if (IS_ERR(root_mnt))
2915 goto out;
2916
2917 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2918
2919 out:
2920 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2921 error != 0 ? " [error]" : "");
2922 return error;
2923 }
2924
2925 /*
2926 * Get the superblock for an NFS4 mountpoint
2927 */
2928 static int nfs4_get_sb(struct file_system_type *fs_type,
2929 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2930 {
2931 struct nfs_parsed_mount_data *data;
2932 int error = -ENOMEM;
2933
2934 data = nfs_alloc_parsed_mount_data(4);
2935 if (data == NULL)
2936 goto out_free_data;
2937
2938 /* Validate the mount data */
2939 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2940 if (error < 0)
2941 goto out;
2942
2943 error = nfs4_try_mount(flags, dev_name, data, mnt);
2944
2945 out:
2946 kfree(data->client_address);
2947 kfree(data->nfs_server.export_path);
2948 kfree(data->nfs_server.hostname);
2949 kfree(data->fscache_uniq);
2950 out_free_data:
2951 kfree(data);
2952 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2953 error != 0 ? " [error]" : "");
2954 return error;
2955 }
2956
2957 static void nfs4_kill_super(struct super_block *sb)
2958 {
2959 struct nfs_server *server = NFS_SB(sb);
2960
2961 dprintk("--> %s\n", __func__);
2962 nfs_super_return_all_delegations(sb);
2963 kill_anon_super(sb);
2964 nfs_fscache_release_super_cookie(sb);
2965 nfs_free_server(server);
2966 dprintk("<-- %s\n", __func__);
2967 }
2968
2969 /*
2970 * Clone an NFS4 server record on xdev traversal (FSID-change)
2971 */
2972 static struct dentry *
2973 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2974 const char *dev_name, void *raw_data)
2975 {
2976 struct nfs_clone_mount *data = raw_data;
2977 struct super_block *s;
2978 struct nfs_server *server;
2979 struct dentry *mntroot;
2980 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2981 struct nfs_sb_mountdata sb_mntdata = {
2982 .mntflags = flags,
2983 };
2984 int error;
2985
2986 dprintk("--> nfs4_xdev_mount()\n");
2987
2988 /* create a new volume representation */
2989 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2990 if (IS_ERR(server)) {
2991 error = PTR_ERR(server);
2992 goto out_err_noserver;
2993 }
2994 sb_mntdata.server = server;
2995
2996 if (server->flags & NFS4_MOUNT_UNSHARED)
2997 compare_super = NULL;
2998
2999 /* Get a superblock - note that we may end up sharing one that already exists */
3000 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3001 if (IS_ERR(s)) {
3002 error = PTR_ERR(s);
3003 goto out_err_nosb;
3004 }
3005
3006 if (s->s_fs_info != server) {
3007 nfs_free_server(server);
3008 server = NULL;
3009 } else {
3010 error = nfs_bdi_register(server);
3011 if (error)
3012 goto error_splat_bdi;
3013 }
3014
3015 if (!s->s_root) {
3016 /* initial superblock/root creation */
3017 nfs4_clone_super(s, data->sb);
3018 nfs_fscache_get_super_cookie(s, NULL, data);
3019 }
3020
3021 mntroot = nfs4_get_root(s, data->fh);
3022 if (IS_ERR(mntroot)) {
3023 error = PTR_ERR(mntroot);
3024 goto error_splat_super;
3025 }
3026 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3027 dput(mntroot);
3028 error = -ESTALE;
3029 goto error_splat_super;
3030 }
3031
3032 s->s_flags |= MS_ACTIVE;
3033
3034 security_sb_clone_mnt_opts(data->sb, s);
3035
3036 dprintk("<-- nfs4_xdev_mount() = 0\n");
3037 return mntroot;
3038
3039 out_err_nosb:
3040 nfs_free_server(server);
3041 out_err_noserver:
3042 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3043 return ERR_PTR(error);
3044
3045 error_splat_super:
3046 if (server && !s->s_root)
3047 bdi_unregister(&server->backing_dev_info);
3048 error_splat_bdi:
3049 deactivate_locked_super(s);
3050 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3051 return ERR_PTR(error);
3052 }
3053
3054 static struct dentry *
3055 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3056 const char *dev_name, void *raw_data)
3057 {
3058 struct nfs_clone_mount *data = raw_data;
3059 struct super_block *s;
3060 struct nfs_server *server;
3061 struct dentry *mntroot;
3062 struct nfs_fh *mntfh;
3063 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3064 struct nfs_sb_mountdata sb_mntdata = {
3065 .mntflags = flags,
3066 };
3067 int error = -ENOMEM;
3068
3069 dprintk("--> nfs4_referral_get_sb()\n");
3070
3071 mntfh = nfs_alloc_fhandle();
3072 if (mntfh == NULL)
3073 goto out_err_nofh;
3074
3075 /* create a new volume representation */
3076 server = nfs4_create_referral_server(data, mntfh);
3077 if (IS_ERR(server)) {
3078 error = PTR_ERR(server);
3079 goto out_err_noserver;
3080 }
3081 sb_mntdata.server = server;
3082
3083 if (server->flags & NFS4_MOUNT_UNSHARED)
3084 compare_super = NULL;
3085
3086 /* Get a superblock - note that we may end up sharing one that already exists */
3087 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3088 if (IS_ERR(s)) {
3089 error = PTR_ERR(s);
3090 goto out_err_nosb;
3091 }
3092
3093 if (s->s_fs_info != server) {
3094 nfs_free_server(server);
3095 server = NULL;
3096 } else {
3097 error = nfs_bdi_register(server);
3098 if (error)
3099 goto error_splat_bdi;
3100 }
3101
3102 if (!s->s_root) {
3103 /* initial superblock/root creation */
3104 nfs4_fill_super(s);
3105 nfs_fscache_get_super_cookie(s, NULL, data);
3106 }
3107
3108 mntroot = nfs4_get_root(s, mntfh);
3109 if (IS_ERR(mntroot)) {
3110 error = PTR_ERR(mntroot);
3111 goto error_splat_super;
3112 }
3113 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3114 dput(mntroot);
3115 error = -ESTALE;
3116 goto error_splat_super;
3117 }
3118
3119 s->s_flags |= MS_ACTIVE;
3120
3121 security_sb_clone_mnt_opts(data->sb, s);
3122
3123 nfs_free_fhandle(mntfh);
3124 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3125 return mntroot;
3126
3127 out_err_nosb:
3128 nfs_free_server(server);
3129 out_err_noserver:
3130 nfs_free_fhandle(mntfh);
3131 out_err_nofh:
3132 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3133 return ERR_PTR(error);
3134
3135 error_splat_super:
3136 if (server && !s->s_root)
3137 bdi_unregister(&server->backing_dev_info);
3138 error_splat_bdi:
3139 deactivate_locked_super(s);
3140 nfs_free_fhandle(mntfh);
3141 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3142 return ERR_PTR(error);
3143 }
3144
3145 /*
3146 * Create an NFS4 server record on referral traversal
3147 */
3148 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3149 int flags, const char *dev_name, void *raw_data,
3150 struct vfsmount *mnt)
3151 {
3152 struct nfs_clone_mount *data = raw_data;
3153 char *export_path;
3154 struct vfsmount *root_mnt;
3155 int error;
3156
3157 dprintk("--> nfs4_referral_get_sb()\n");
3158
3159 export_path = data->mnt_path;
3160 data->mnt_path = "/";
3161
3162 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3163 flags, data, data->hostname);
3164 data->mnt_path = export_path;
3165
3166 error = PTR_ERR(root_mnt);
3167 if (IS_ERR(root_mnt))
3168 goto out;
3169
3170 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3171 out:
3172 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3173 error != 0 ? " [error]" : "");
3174 return error;
3175 }
3176
3177 #endif /* CONFIG_NFS_V4 */
Linus' kernel tree