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Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / fs / nfs / super.c
blobb68c8607770fcf09188882f6823b69f894aa24d7
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 &&
602 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
603 showdefaults)
604 seq_printf(m, ",mountport=%u", nfss->mountd_port);
605
606 nfs_show_mountd_netid(m, nfss, showdefaults);
607 }
608
609 #ifdef CONFIG_NFS_V4
610 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
611 int showdefaults)
612 {
613 struct nfs_client *clp = nfss->nfs_client;
614
615 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
616 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
617 }
618 #else
619 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
620 int showdefaults)
621 {
622 }
623 #endif
624
625 /*
626 * Describe the mount options in force on this server representation
627 */
628 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
629 int showdefaults)
630 {
631 static const struct proc_nfs_info {
632 int flag;
633 const char *str;
634 const char *nostr;
635 } nfs_info[] = {
636 { NFS_MOUNT_SOFT, ",soft", ",hard" },
637 { NFS_MOUNT_POSIX, ",posix", "" },
638 { NFS_MOUNT_NOCTO, ",nocto", "" },
639 { NFS_MOUNT_NOAC, ",noac", "" },
640 { NFS_MOUNT_NONLM, ",nolock", "" },
641 { NFS_MOUNT_NOACL, ",noacl", "" },
642 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
643 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
644 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
645 { 0, NULL, NULL }
646 };
647 const struct proc_nfs_info *nfs_infop;
648 struct nfs_client *clp = nfss->nfs_client;
649 u32 version = clp->rpc_ops->version;
650 int local_flock, local_fcntl;
651
652 seq_printf(m, ",vers=%u", version);
653 seq_printf(m, ",rsize=%u", nfss->rsize);
654 seq_printf(m, ",wsize=%u", nfss->wsize);
655 if (nfss->bsize != 0)
656 seq_printf(m, ",bsize=%u", nfss->bsize);
657 seq_printf(m, ",namlen=%u", nfss->namelen);
658 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
659 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
660 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
661 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
662 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
663 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
664 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
665 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
666 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
667 if (nfss->flags & nfs_infop->flag)
668 seq_puts(m, nfs_infop->str);
669 else
670 seq_puts(m, nfs_infop->nostr);
671 }
672 seq_printf(m, ",proto=%s",
673 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
674 if (version == 4) {
675 if (nfss->port != NFS_PORT)
676 seq_printf(m, ",port=%u", nfss->port);
677 } else
678 if (nfss->port)
679 seq_printf(m, ",port=%u", nfss->port);
680
681 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
682 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
683 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
684
685 if (version != 4)
686 nfs_show_mountd_options(m, nfss, showdefaults);
687 else
688 nfs_show_nfsv4_options(m, nfss, showdefaults);
689
690 if (nfss->options & NFS_OPTION_FSCACHE)
691 seq_printf(m, ",fsc");
692
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
696 else
697 seq_printf(m, ",lookupcache=pos");
698 }
699
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702
703 if (!local_flock && !local_fcntl)
704 seq_printf(m, ",local_lock=none");
705 else if (local_flock && local_fcntl)
706 seq_printf(m, ",local_lock=all");
707 else if (local_flock)
708 seq_printf(m, ",local_lock=flock");
709 else
710 seq_printf(m, ",local_lock=posix");
711 }
712
713 /*
714 * Describe the mount options on this VFS mountpoint
715 */
716 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
717 {
718 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
719
720 nfs_show_mount_options(m, nfss, 0);
721
722 seq_printf(m, ",addr=%s",
723 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
724 RPC_DISPLAY_ADDR));
725
726 return 0;
727 }
728
729 /*
730 * Present statistical information for this VFS mountpoint
731 */
732 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
733 {
734 int i, cpu;
735 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
736 struct rpc_auth *auth = nfss->client->cl_auth;
737 struct nfs_iostats totals = { };
738
739 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
740
741 /*
742 * Display all mount option settings
743 */
744 seq_printf(m, "\n\topts:\t");
745 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
746 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
747 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
748 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
749 nfs_show_mount_options(m, nfss, 1);
750
751 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
752
753 seq_printf(m, "\n\tcaps:\t");
754 seq_printf(m, "caps=0x%x", nfss->caps);
755 seq_printf(m, ",wtmult=%u", nfss->wtmult);
756 seq_printf(m, ",dtsize=%u", nfss->dtsize);
757 seq_printf(m, ",bsize=%u", nfss->bsize);
758 seq_printf(m, ",namlen=%u", nfss->namelen);
759
760 #ifdef CONFIG_NFS_V4
761 if (nfss->nfs_client->rpc_ops->version == 4) {
762 seq_printf(m, "\n\tnfsv4:\t");
763 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
764 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
765 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
766 }
767 #endif
768
769 /*
770 * Display security flavor in effect for this mount
771 */
772 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
773 if (auth->au_flavor)
774 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
775
776 /*
777 * Display superblock I/O counters
778 */
779 for_each_possible_cpu(cpu) {
780 struct nfs_iostats *stats;
781
782 preempt_disable();
783 stats = per_cpu_ptr(nfss->io_stats, cpu);
784
785 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
786 totals.events[i] += stats->events[i];
787 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
788 totals.bytes[i] += stats->bytes[i];
789 #ifdef CONFIG_NFS_FSCACHE
790 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
791 totals.fscache[i] += stats->fscache[i];
792 #endif
793
794 preempt_enable();
795 }
796
797 seq_printf(m, "\n\tevents:\t");
798 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
799 seq_printf(m, "%lu ", totals.events[i]);
800 seq_printf(m, "\n\tbytes:\t");
801 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
802 seq_printf(m, "%Lu ", totals.bytes[i]);
803 #ifdef CONFIG_NFS_FSCACHE
804 if (nfss->options & NFS_OPTION_FSCACHE) {
805 seq_printf(m, "\n\tfsc:\t");
806 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
807 seq_printf(m, "%Lu ", totals.bytes[i]);
808 }
809 #endif
810 seq_printf(m, "\n");
811
812 rpc_print_iostats(m, nfss->client);
813
814 return 0;
815 }
816
817 /*
818 * Begin unmount by attempting to remove all automounted mountpoints we added
819 * in response to xdev traversals and referrals
820 */
821 static void nfs_umount_begin(struct super_block *sb)
822 {
823 struct nfs_server *server;
824 struct rpc_clnt *rpc;
825
826 server = NFS_SB(sb);
827 /* -EIO all pending I/O */
828 rpc = server->client_acl;
829 if (!IS_ERR(rpc))
830 rpc_killall_tasks(rpc);
831 rpc = server->client;
832 if (!IS_ERR(rpc))
833 rpc_killall_tasks(rpc);
834 }
835
836 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
837 {
838 struct nfs_parsed_mount_data *data;
839
840 data = kzalloc(sizeof(*data), GFP_KERNEL);
841 if (data) {
842 data->acregmin = NFS_DEF_ACREGMIN;
843 data->acregmax = NFS_DEF_ACREGMAX;
844 data->acdirmin = NFS_DEF_ACDIRMIN;
845 data->acdirmax = NFS_DEF_ACDIRMAX;
846 data->mount_server.port = NFS_UNSPEC_PORT;
847 data->nfs_server.port = NFS_UNSPEC_PORT;
848 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
849 data->auth_flavors[0] = RPC_AUTH_UNIX;
850 data->auth_flavor_len = 1;
851 data->version = version;
852 data->minorversion = 0;
853 }
854 return data;
855 }
856
857 /*
858 * Sanity-check a server address provided by the mount command.
859 *
860 * Address family must be initialized, and address must not be
861 * the ANY address for that family.
862 */
863 static int nfs_verify_server_address(struct sockaddr *addr)
864 {
865 switch (addr->sa_family) {
866 case AF_INET: {
867 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
868 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
869 }
870 case AF_INET6: {
871 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
872 return !ipv6_addr_any(sa);
873 }
874 }
875
876 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
877 return 0;
878 }
879
880 /*
881 * Select between a default port value and a user-specified port value.
882 * If a zero value is set, then autobind will be used.
883 */
884 static void nfs_set_port(struct sockaddr *sap, int *port,
885 const unsigned short default_port)
886 {
887 if (*port == NFS_UNSPEC_PORT)
888 *port = default_port;
889
890 rpc_set_port(sap, *port);
891 }
892
893 /*
894 * Sanity check the NFS transport protocol.
895 *
896 */
897 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
898 {
899 switch (mnt->nfs_server.protocol) {
900 case XPRT_TRANSPORT_UDP:
901 case XPRT_TRANSPORT_TCP:
902 case XPRT_TRANSPORT_RDMA:
903 break;
904 default:
905 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
906 }
907 }
908
909 /*
910 * For text based NFSv2/v3 mounts, the mount protocol transport default
911 * settings should depend upon the specified NFS transport.
912 */
913 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
914 {
915 nfs_validate_transport_protocol(mnt);
916
917 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
918 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
919 return;
920 switch (mnt->nfs_server.protocol) {
921 case XPRT_TRANSPORT_UDP:
922 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
923 break;
924 case XPRT_TRANSPORT_TCP:
925 case XPRT_TRANSPORT_RDMA:
926 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
927 }
928 }
929
930 /*
931 * Parse the value of the 'sec=' option.
932 */
933 static int nfs_parse_security_flavors(char *value,
934 struct nfs_parsed_mount_data *mnt)
935 {
936 substring_t args[MAX_OPT_ARGS];
937
938 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
939
940 switch (match_token(value, nfs_secflavor_tokens, args)) {
941 case Opt_sec_none:
942 mnt->auth_flavors[0] = RPC_AUTH_NULL;
943 break;
944 case Opt_sec_sys:
945 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
946 break;
947 case Opt_sec_krb5:
948 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
949 break;
950 case Opt_sec_krb5i:
951 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
952 break;
953 case Opt_sec_krb5p:
954 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
955 break;
956 case Opt_sec_lkey:
957 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
958 break;
959 case Opt_sec_lkeyi:
960 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
961 break;
962 case Opt_sec_lkeyp:
963 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
964 break;
965 case Opt_sec_spkm:
966 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
967 break;
968 case Opt_sec_spkmi:
969 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
970 break;
971 case Opt_sec_spkmp:
972 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
973 break;
974 default:
975 return 0;
976 }
977
978 mnt->auth_flavor_len = 1;
979 return 1;
980 }
981
982 /*
983 * Error-check and convert a string of mount options from user space into
984 * a data structure. The whole mount string is processed; bad options are
985 * skipped as they are encountered. If there were no errors, return 1;
986 * otherwise return 0 (zero).
987 */
988 static int nfs_parse_mount_options(char *raw,
989 struct nfs_parsed_mount_data *mnt)
990 {
991 char *p, *string, *secdata;
992 int rc, sloppy = 0, invalid_option = 0;
993 unsigned short protofamily = AF_UNSPEC;
994 unsigned short mountfamily = AF_UNSPEC;
995
996 if (!raw) {
997 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
998 return 1;
999 }
1000 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1001
1002 secdata = alloc_secdata();
1003 if (!secdata)
1004 goto out_nomem;
1005
1006 rc = security_sb_copy_data(raw, secdata);
1007 if (rc)
1008 goto out_security_failure;
1009
1010 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1011 if (rc)
1012 goto out_security_failure;
1013
1014 free_secdata(secdata);
1015
1016 while ((p = strsep(&raw, ",")) != NULL) {
1017 substring_t args[MAX_OPT_ARGS];
1018 unsigned long option;
1019 int token;
1020
1021 if (!*p)
1022 continue;
1023
1024 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1025
1026 token = match_token(p, nfs_mount_option_tokens, args);
1027 switch (token) {
1028
1029 /*
1030 * boolean options: foo/nofoo
1031 */
1032 case Opt_soft:
1033 mnt->flags |= NFS_MOUNT_SOFT;
1034 break;
1035 case Opt_hard:
1036 mnt->flags &= ~NFS_MOUNT_SOFT;
1037 break;
1038 case Opt_posix:
1039 mnt->flags |= NFS_MOUNT_POSIX;
1040 break;
1041 case Opt_noposix:
1042 mnt->flags &= ~NFS_MOUNT_POSIX;
1043 break;
1044 case Opt_cto:
1045 mnt->flags &= ~NFS_MOUNT_NOCTO;
1046 break;
1047 case Opt_nocto:
1048 mnt->flags |= NFS_MOUNT_NOCTO;
1049 break;
1050 case Opt_ac:
1051 mnt->flags &= ~NFS_MOUNT_NOAC;
1052 break;
1053 case Opt_noac:
1054 mnt->flags |= NFS_MOUNT_NOAC;
1055 break;
1056 case Opt_lock:
1057 mnt->flags &= ~NFS_MOUNT_NONLM;
1058 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1059 NFS_MOUNT_LOCAL_FCNTL);
1060 break;
1061 case Opt_nolock:
1062 mnt->flags |= NFS_MOUNT_NONLM;
1063 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1064 NFS_MOUNT_LOCAL_FCNTL);
1065 break;
1066 case Opt_v2:
1067 mnt->flags &= ~NFS_MOUNT_VER3;
1068 mnt->version = 2;
1069 break;
1070 case Opt_v3:
1071 mnt->flags |= NFS_MOUNT_VER3;
1072 mnt->version = 3;
1073 break;
1074 case Opt_v4:
1075 mnt->flags &= ~NFS_MOUNT_VER3;
1076 mnt->version = 4;
1077 break;
1078 case Opt_udp:
1079 mnt->flags &= ~NFS_MOUNT_TCP;
1080 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1081 break;
1082 case Opt_tcp:
1083 mnt->flags |= NFS_MOUNT_TCP;
1084 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1085 break;
1086 case Opt_rdma:
1087 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1088 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1089 xprt_load_transport(p);
1090 break;
1091 case Opt_acl:
1092 mnt->flags &= ~NFS_MOUNT_NOACL;
1093 break;
1094 case Opt_noacl:
1095 mnt->flags |= NFS_MOUNT_NOACL;
1096 break;
1097 case Opt_rdirplus:
1098 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1099 break;
1100 case Opt_nordirplus:
1101 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1102 break;
1103 case Opt_sharecache:
1104 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1105 break;
1106 case Opt_nosharecache:
1107 mnt->flags |= NFS_MOUNT_UNSHARED;
1108 break;
1109 case Opt_resvport:
1110 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1111 break;
1112 case Opt_noresvport:
1113 mnt->flags |= NFS_MOUNT_NORESVPORT;
1114 break;
1115 case Opt_fscache:
1116 mnt->options |= NFS_OPTION_FSCACHE;
1117 kfree(mnt->fscache_uniq);
1118 mnt->fscache_uniq = NULL;
1119 break;
1120 case Opt_nofscache:
1121 mnt->options &= ~NFS_OPTION_FSCACHE;
1122 kfree(mnt->fscache_uniq);
1123 mnt->fscache_uniq = NULL;
1124 break;
1125
1126 /*
1127 * options that take numeric values
1128 */
1129 case Opt_port:
1130 string = match_strdup(args);
1131 if (string == NULL)
1132 goto out_nomem;
1133 rc = strict_strtoul(string, 10, &option);
1134 kfree(string);
1135 if (rc != 0 || option > USHRT_MAX)
1136 goto out_invalid_value;
1137 mnt->nfs_server.port = option;
1138 break;
1139 case Opt_rsize:
1140 string = match_strdup(args);
1141 if (string == NULL)
1142 goto out_nomem;
1143 rc = strict_strtoul(string, 10, &option);
1144 kfree(string);
1145 if (rc != 0)
1146 goto out_invalid_value;
1147 mnt->rsize = option;
1148 break;
1149 case Opt_wsize:
1150 string = match_strdup(args);
1151 if (string == NULL)
1152 goto out_nomem;
1153 rc = strict_strtoul(string, 10, &option);
1154 kfree(string);
1155 if (rc != 0)
1156 goto out_invalid_value;
1157 mnt->wsize = option;
1158 break;
1159 case Opt_bsize:
1160 string = match_strdup(args);
1161 if (string == NULL)
1162 goto out_nomem;
1163 rc = strict_strtoul(string, 10, &option);
1164 kfree(string);
1165 if (rc != 0)
1166 goto out_invalid_value;
1167 mnt->bsize = option;
1168 break;
1169 case Opt_timeo:
1170 string = match_strdup(args);
1171 if (string == NULL)
1172 goto out_nomem;
1173 rc = strict_strtoul(string, 10, &option);
1174 kfree(string);
1175 if (rc != 0 || option == 0)
1176 goto out_invalid_value;
1177 mnt->timeo = option;
1178 break;
1179 case Opt_retrans:
1180 string = match_strdup(args);
1181 if (string == NULL)
1182 goto out_nomem;
1183 rc = strict_strtoul(string, 10, &option);
1184 kfree(string);
1185 if (rc != 0 || option == 0)
1186 goto out_invalid_value;
1187 mnt->retrans = option;
1188 break;
1189 case Opt_acregmin:
1190 string = match_strdup(args);
1191 if (string == NULL)
1192 goto out_nomem;
1193 rc = strict_strtoul(string, 10, &option);
1194 kfree(string);
1195 if (rc != 0)
1196 goto out_invalid_value;
1197 mnt->acregmin = option;
1198 break;
1199 case Opt_acregmax:
1200 string = match_strdup(args);
1201 if (string == NULL)
1202 goto out_nomem;
1203 rc = strict_strtoul(string, 10, &option);
1204 kfree(string);
1205 if (rc != 0)
1206 goto out_invalid_value;
1207 mnt->acregmax = option;
1208 break;
1209 case Opt_acdirmin:
1210 string = match_strdup(args);
1211 if (string == NULL)
1212 goto out_nomem;
1213 rc = strict_strtoul(string, 10, &option);
1214 kfree(string);
1215 if (rc != 0)
1216 goto out_invalid_value;
1217 mnt->acdirmin = option;
1218 break;
1219 case Opt_acdirmax:
1220 string = match_strdup(args);
1221 if (string == NULL)
1222 goto out_nomem;
1223 rc = strict_strtoul(string, 10, &option);
1224 kfree(string);
1225 if (rc != 0)
1226 goto out_invalid_value;
1227 mnt->acdirmax = option;
1228 break;
1229 case Opt_actimeo:
1230 string = match_strdup(args);
1231 if (string == NULL)
1232 goto out_nomem;
1233 rc = strict_strtoul(string, 10, &option);
1234 kfree(string);
1235 if (rc != 0)
1236 goto out_invalid_value;
1237 mnt->acregmin = mnt->acregmax =
1238 mnt->acdirmin = mnt->acdirmax = option;
1239 break;
1240 case Opt_namelen:
1241 string = match_strdup(args);
1242 if (string == NULL)
1243 goto out_nomem;
1244 rc = strict_strtoul(string, 10, &option);
1245 kfree(string);
1246 if (rc != 0)
1247 goto out_invalid_value;
1248 mnt->namlen = option;
1249 break;
1250 case Opt_mountport:
1251 string = match_strdup(args);
1252 if (string == NULL)
1253 goto out_nomem;
1254 rc = strict_strtoul(string, 10, &option);
1255 kfree(string);
1256 if (rc != 0 || option > USHRT_MAX)
1257 goto out_invalid_value;
1258 mnt->mount_server.port = option;
1259 break;
1260 case Opt_mountvers:
1261 string = match_strdup(args);
1262 if (string == NULL)
1263 goto out_nomem;
1264 rc = strict_strtoul(string, 10, &option);
1265 kfree(string);
1266 if (rc != 0 ||
1267 option < NFS_MNT_VERSION ||
1268 option > NFS_MNT3_VERSION)
1269 goto out_invalid_value;
1270 mnt->mount_server.version = option;
1271 break;
1272 case Opt_nfsvers:
1273 string = match_strdup(args);
1274 if (string == NULL)
1275 goto out_nomem;
1276 rc = strict_strtoul(string, 10, &option);
1277 kfree(string);
1278 if (rc != 0)
1279 goto out_invalid_value;
1280 switch (option) {
1281 case NFS2_VERSION:
1282 mnt->flags &= ~NFS_MOUNT_VER3;
1283 mnt->version = 2;
1284 break;
1285 case NFS3_VERSION:
1286 mnt->flags |= NFS_MOUNT_VER3;
1287 mnt->version = 3;
1288 break;
1289 case NFS4_VERSION:
1290 mnt->flags &= ~NFS_MOUNT_VER3;
1291 mnt->version = 4;
1292 break;
1293 default:
1294 goto out_invalid_value;
1295 }
1296 break;
1297 case Opt_minorversion:
1298 string = match_strdup(args);
1299 if (string == NULL)
1300 goto out_nomem;
1301 rc = strict_strtoul(string, 10, &option);
1302 kfree(string);
1303 if (rc != 0)
1304 goto out_invalid_value;
1305 if (option > NFS4_MAX_MINOR_VERSION)
1306 goto out_invalid_value;
1307 mnt->minorversion = option;
1308 break;
1309
1310 /*
1311 * options that take text values
1312 */
1313 case Opt_sec:
1314 string = match_strdup(args);
1315 if (string == NULL)
1316 goto out_nomem;
1317 rc = nfs_parse_security_flavors(string, mnt);
1318 kfree(string);
1319 if (!rc) {
1320 dfprintk(MOUNT, "NFS: unrecognized "
1321 "security flavor\n");
1322 return 0;
1323 }
1324 break;
1325 case Opt_proto:
1326 string = match_strdup(args);
1327 if (string == NULL)
1328 goto out_nomem;
1329 token = match_token(string,
1330 nfs_xprt_protocol_tokens, args);
1331
1332 protofamily = AF_INET;
1333 switch (token) {
1334 case Opt_xprt_udp6:
1335 protofamily = AF_INET6;
1336 case Opt_xprt_udp:
1337 mnt->flags &= ~NFS_MOUNT_TCP;
1338 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1339 kfree(string);
1340 break;
1341 case Opt_xprt_tcp6:
1342 protofamily = AF_INET6;
1343 case Opt_xprt_tcp:
1344 mnt->flags |= NFS_MOUNT_TCP;
1345 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1346 kfree(string);
1347 break;
1348 case Opt_xprt_rdma:
1349 /* vector side protocols to TCP */
1350 mnt->flags |= NFS_MOUNT_TCP;
1351 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1352 xprt_load_transport(string);
1353 kfree(string);
1354 break;
1355 default:
1356 dfprintk(MOUNT, "NFS: unrecognized "
1357 "transport protocol\n");
1358 kfree(string);
1359 return 0;
1360 }
1361 break;
1362 case Opt_mountproto:
1363 string = match_strdup(args);
1364 if (string == NULL)
1365 goto out_nomem;
1366 token = match_token(string,
1367 nfs_xprt_protocol_tokens, args);
1368 kfree(string);
1369
1370 mountfamily = AF_INET;
1371 switch (token) {
1372 case Opt_xprt_udp6:
1373 mountfamily = AF_INET6;
1374 case Opt_xprt_udp:
1375 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1376 break;
1377 case Opt_xprt_tcp6:
1378 mountfamily = AF_INET6;
1379 case Opt_xprt_tcp:
1380 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1381 break;
1382 case Opt_xprt_rdma: /* not used for side protocols */
1383 default:
1384 dfprintk(MOUNT, "NFS: unrecognized "
1385 "transport protocol\n");
1386 return 0;
1387 }
1388 break;
1389 case Opt_addr:
1390 string = match_strdup(args);
1391 if (string == NULL)
1392 goto out_nomem;
1393 mnt->nfs_server.addrlen =
1394 rpc_pton(string, strlen(string),
1395 (struct sockaddr *)
1396 &mnt->nfs_server.address,
1397 sizeof(mnt->nfs_server.address));
1398 kfree(string);
1399 if (mnt->nfs_server.addrlen == 0)
1400 goto out_invalid_address;
1401 break;
1402 case Opt_clientaddr:
1403 string = match_strdup(args);
1404 if (string == NULL)
1405 goto out_nomem;
1406 kfree(mnt->client_address);
1407 mnt->client_address = string;
1408 break;
1409 case Opt_mounthost:
1410 string = match_strdup(args);
1411 if (string == NULL)
1412 goto out_nomem;
1413 kfree(mnt->mount_server.hostname);
1414 mnt->mount_server.hostname = string;
1415 break;
1416 case Opt_mountaddr:
1417 string = match_strdup(args);
1418 if (string == NULL)
1419 goto out_nomem;
1420 mnt->mount_server.addrlen =
1421 rpc_pton(string, strlen(string),
1422 (struct sockaddr *)
1423 &mnt->mount_server.address,
1424 sizeof(mnt->mount_server.address));
1425 kfree(string);
1426 if (mnt->mount_server.addrlen == 0)
1427 goto out_invalid_address;
1428 break;
1429 case Opt_lookupcache:
1430 string = match_strdup(args);
1431 if (string == NULL)
1432 goto out_nomem;
1433 token = match_token(string,
1434 nfs_lookupcache_tokens, args);
1435 kfree(string);
1436 switch (token) {
1437 case Opt_lookupcache_all:
1438 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1439 break;
1440 case Opt_lookupcache_positive:
1441 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1443 break;
1444 case Opt_lookupcache_none:
1445 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1446 break;
1447 default:
1448 dfprintk(MOUNT, "NFS: invalid "
1449 "lookupcache argument\n");
1450 return 0;
1451 };
1452 break;
1453 case Opt_fscache_uniq:
1454 string = match_strdup(args);
1455 if (string == NULL)
1456 goto out_nomem;
1457 kfree(mnt->fscache_uniq);
1458 mnt->fscache_uniq = string;
1459 mnt->options |= NFS_OPTION_FSCACHE;
1460 break;
1461 case Opt_local_lock:
1462 string = match_strdup(args);
1463 if (string == NULL)
1464 goto out_nomem;
1465 token = match_token(string, nfs_local_lock_tokens,
1466 args);
1467 kfree(string);
1468 switch (token) {
1469 case Opt_local_lock_all:
1470 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1471 NFS_MOUNT_LOCAL_FCNTL);
1472 break;
1473 case Opt_local_lock_flock:
1474 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1475 break;
1476 case Opt_local_lock_posix:
1477 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1478 break;
1479 case Opt_local_lock_none:
1480 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1481 NFS_MOUNT_LOCAL_FCNTL);
1482 break;
1483 default:
1484 dfprintk(MOUNT, "NFS: invalid "
1485 "local_lock argument\n");
1486 return 0;
1487 };
1488 break;
1489
1490 /*
1491 * Special options
1492 */
1493 case Opt_sloppy:
1494 sloppy = 1;
1495 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1496 break;
1497 case Opt_userspace:
1498 case Opt_deprecated:
1499 dfprintk(MOUNT, "NFS: ignoring mount option "
1500 "'%s'\n", p);
1501 break;
1502
1503 default:
1504 invalid_option = 1;
1505 dfprintk(MOUNT, "NFS: unrecognized mount option "
1506 "'%s'\n", p);
1507 }
1508 }
1509
1510 if (!sloppy && invalid_option)
1511 return 0;
1512
1513 /*
1514 * verify that any proto=/mountproto= options match the address
1515 * familiies in the addr=/mountaddr= options.
1516 */
1517 if (protofamily != AF_UNSPEC &&
1518 protofamily != mnt->nfs_server.address.ss_family)
1519 goto out_proto_mismatch;
1520
1521 if (mountfamily != AF_UNSPEC) {
1522 if (mnt->mount_server.addrlen) {
1523 if (mountfamily != mnt->mount_server.address.ss_family)
1524 goto out_mountproto_mismatch;
1525 } else {
1526 if (mountfamily != mnt->nfs_server.address.ss_family)
1527 goto out_mountproto_mismatch;
1528 }
1529 }
1530
1531 return 1;
1532
1533 out_mountproto_mismatch:
1534 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1535 "option\n");
1536 return 0;
1537 out_proto_mismatch:
1538 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1539 return 0;
1540 out_invalid_address:
1541 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1542 return 0;
1543 out_invalid_value:
1544 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1545 return 0;
1546 out_nomem:
1547 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1548 return 0;
1549 out_security_failure:
1550 free_secdata(secdata);
1551 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1552 return 0;
1553 }
1554
1555 /*
1556 * Match the requested auth flavors with the list returned by
1557 * the server. Returns zero and sets the mount's authentication
1558 * flavor on success; returns -EACCES if server does not support
1559 * the requested flavor.
1560 */
1561 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1562 struct nfs_mount_request *request)
1563 {
1564 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1565
1566 /*
1567 * Certain releases of Linux's mountd return an empty
1568 * flavor list. To prevent behavioral regression with
1569 * these servers (ie. rejecting mounts that used to
1570 * succeed), revert to pre-2.6.32 behavior (no checking)
1571 * if the returned flavor list is empty.
1572 */
1573 if (server_authlist_len == 0)
1574 return 0;
1575
1576 /*
1577 * We avoid sophisticated negotiating here, as there are
1578 * plenty of cases where we can get it wrong, providing
1579 * either too little or too much security.
1580 *
1581 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1582 * flavor listed first. However, some servers list
1583 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1584 * preferred default, in args->auth_flavors[0] if user
1585 * didn't specify sec= mount option.
1586 */
1587 for (i = 0; i < args->auth_flavor_len; i++)
1588 for (j = 0; j < server_authlist_len; j++)
1589 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1590 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1591 request->auth_flavs[j]);
1592 args->auth_flavors[0] = request->auth_flavs[j];
1593 return 0;
1594 }
1595
1596 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1597 nfs_umount(request);
1598 return -EACCES;
1599 }
1600
1601 /*
1602 * Use the remote server's MOUNT service to request the NFS file handle
1603 * corresponding to the provided path.
1604 */
1605 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1606 struct nfs_fh *root_fh)
1607 {
1608 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1609 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1610 struct nfs_mount_request request = {
1611 .sap = (struct sockaddr *)
1612 &args->mount_server.address,
1613 .dirpath = args->nfs_server.export_path,
1614 .protocol = args->mount_server.protocol,
1615 .fh = root_fh,
1616 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1617 .auth_flav_len = &server_authlist_len,
1618 .auth_flavs = server_authlist,
1619 };
1620 int status;
1621
1622 if (args->mount_server.version == 0) {
1623 switch (args->version) {
1624 default:
1625 args->mount_server.version = NFS_MNT3_VERSION;
1626 break;
1627 case 2:
1628 args->mount_server.version = NFS_MNT_VERSION;
1629 }
1630 }
1631 request.version = args->mount_server.version;
1632
1633 if (args->mount_server.hostname)
1634 request.hostname = args->mount_server.hostname;
1635 else
1636 request.hostname = args->nfs_server.hostname;
1637
1638 /*
1639 * Construct the mount server's address.
1640 */
1641 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1642 memcpy(request.sap, &args->nfs_server.address,
1643 args->nfs_server.addrlen);
1644 args->mount_server.addrlen = args->nfs_server.addrlen;
1645 }
1646 request.salen = args->mount_server.addrlen;
1647 nfs_set_port(request.sap, &args->mount_server.port, 0);
1648
1649 /*
1650 * Now ask the mount server to map our export path
1651 * to a file handle.
1652 */
1653 status = nfs_mount(&request);
1654 if (status != 0) {
1655 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1656 request.hostname, status);
1657 return status;
1658 }
1659
1660 /*
1661 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1662 */
1663 if (args->mount_server.version != NFS_MNT3_VERSION)
1664 return 0;
1665 return nfs_walk_authlist(args, &request);
1666 }
1667
1668 static int nfs_parse_simple_hostname(const char *dev_name,
1669 char **hostname, size_t maxnamlen,
1670 char **export_path, size_t maxpathlen)
1671 {
1672 size_t len;
1673 char *colon, *comma;
1674
1675 colon = strchr(dev_name, ':');
1676 if (colon == NULL)
1677 goto out_bad_devname;
1678
1679 len = colon - dev_name;
1680 if (len > maxnamlen)
1681 goto out_hostname;
1682
1683 /* N.B. caller will free nfs_server.hostname in all cases */
1684 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1685 if (!*hostname)
1686 goto out_nomem;
1687
1688 /* kill possible hostname list: not supported */
1689 comma = strchr(*hostname, ',');
1690 if (comma != NULL) {
1691 if (comma == *hostname)
1692 goto out_bad_devname;
1693 *comma = '\0';
1694 }
1695
1696 colon++;
1697 len = strlen(colon);
1698 if (len > maxpathlen)
1699 goto out_path;
1700 *export_path = kstrndup(colon, len, GFP_KERNEL);
1701 if (!*export_path)
1702 goto out_nomem;
1703
1704 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1705 return 0;
1706
1707 out_bad_devname:
1708 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1709 return -EINVAL;
1710
1711 out_nomem:
1712 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1713 return -ENOMEM;
1714
1715 out_hostname:
1716 dfprintk(MOUNT, "NFS: server hostname too long\n");
1717 return -ENAMETOOLONG;
1718
1719 out_path:
1720 dfprintk(MOUNT, "NFS: export pathname too long\n");
1721 return -ENAMETOOLONG;
1722 }
1723
1724 /*
1725 * Hostname has square brackets around it because it contains one or
1726 * more colons. We look for the first closing square bracket, and a
1727 * colon must follow it.
1728 */
1729 static int nfs_parse_protected_hostname(const char *dev_name,
1730 char **hostname, size_t maxnamlen,
1731 char **export_path, size_t maxpathlen)
1732 {
1733 size_t len;
1734 char *start, *end;
1735
1736 start = (char *)(dev_name + 1);
1737
1738 end = strchr(start, ']');
1739 if (end == NULL)
1740 goto out_bad_devname;
1741 if (*(end + 1) != ':')
1742 goto out_bad_devname;
1743
1744 len = end - start;
1745 if (len > maxnamlen)
1746 goto out_hostname;
1747
1748 /* N.B. caller will free nfs_server.hostname in all cases */
1749 *hostname = kstrndup(start, len, GFP_KERNEL);
1750 if (*hostname == NULL)
1751 goto out_nomem;
1752
1753 end += 2;
1754 len = strlen(end);
1755 if (len > maxpathlen)
1756 goto out_path;
1757 *export_path = kstrndup(end, len, GFP_KERNEL);
1758 if (!*export_path)
1759 goto out_nomem;
1760
1761 return 0;
1762
1763 out_bad_devname:
1764 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1765 return -EINVAL;
1766
1767 out_nomem:
1768 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1769 return -ENOMEM;
1770
1771 out_hostname:
1772 dfprintk(MOUNT, "NFS: server hostname too long\n");
1773 return -ENAMETOOLONG;
1774
1775 out_path:
1776 dfprintk(MOUNT, "NFS: export pathname too long\n");
1777 return -ENAMETOOLONG;
1778 }
1779
1780 /*
1781 * Split "dev_name" into "hostname:export_path".
1782 *
1783 * The leftmost colon demarks the split between the server's hostname
1784 * and the export path. If the hostname starts with a left square
1785 * bracket, then it may contain colons.
1786 *
1787 * Note: caller frees hostname and export path, even on error.
1788 */
1789 static int nfs_parse_devname(const char *dev_name,
1790 char **hostname, size_t maxnamlen,
1791 char **export_path, size_t maxpathlen)
1792 {
1793 if (*dev_name == '[')
1794 return nfs_parse_protected_hostname(dev_name,
1795 hostname, maxnamlen,
1796 export_path, maxpathlen);
1797
1798 return nfs_parse_simple_hostname(dev_name,
1799 hostname, maxnamlen,
1800 export_path, maxpathlen);
1801 }
1802
1803 /*
1804 * Validate the NFS2/NFS3 mount data
1805 * - fills in the mount root filehandle
1806 *
1807 * For option strings, user space handles the following behaviors:
1808 *
1809 * + DNS: mapping server host name to IP address ("addr=" option)
1810 *
1811 * + failure mode: how to behave if a mount request can't be handled
1812 * immediately ("fg/bg" option)
1813 *
1814 * + retry: how often to retry a mount request ("retry=" option)
1815 *
1816 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1817 * mountproto=tcp after mountproto=udp, and so on
1818 */
1819 static int nfs_validate_mount_data(void *options,
1820 struct nfs_parsed_mount_data *args,
1821 struct nfs_fh *mntfh,
1822 const char *dev_name)
1823 {
1824 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1825 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1826
1827 if (data == NULL)
1828 goto out_no_data;
1829
1830 switch (data->version) {
1831 case 1:
1832 data->namlen = 0;
1833 case 2:
1834 data->bsize = 0;
1835 case 3:
1836 if (data->flags & NFS_MOUNT_VER3)
1837 goto out_no_v3;
1838 data->root.size = NFS2_FHSIZE;
1839 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1840 case 4:
1841 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1842 goto out_no_sec;
1843 case 5:
1844 memset(data->context, 0, sizeof(data->context));
1845 case 6:
1846 if (data->flags & NFS_MOUNT_VER3) {
1847 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1848 goto out_invalid_fh;
1849 mntfh->size = data->root.size;
1850 args->version = 3;
1851 } else {
1852 mntfh->size = NFS2_FHSIZE;
1853 args->version = 2;
1854 }
1855
1856
1857 memcpy(mntfh->data, data->root.data, mntfh->size);
1858 if (mntfh->size < sizeof(mntfh->data))
1859 memset(mntfh->data + mntfh->size, 0,
1860 sizeof(mntfh->data) - mntfh->size);
1861
1862 /*
1863 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1864 * can deal with.
1865 */
1866 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1867 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1868 args->rsize = data->rsize;
1869 args->wsize = data->wsize;
1870 args->timeo = data->timeo;
1871 args->retrans = data->retrans;
1872 args->acregmin = data->acregmin;
1873 args->acregmax = data->acregmax;
1874 args->acdirmin = data->acdirmin;
1875 args->acdirmax = data->acdirmax;
1876
1877 memcpy(sap, &data->addr, sizeof(data->addr));
1878 args->nfs_server.addrlen = sizeof(data->addr);
1879 if (!nfs_verify_server_address(sap))
1880 goto out_no_address;
1881
1882 if (!(data->flags & NFS_MOUNT_TCP))
1883 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1884 /* N.B. caller will free nfs_server.hostname in all cases */
1885 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1886 args->namlen = data->namlen;
1887 args->bsize = data->bsize;
1888
1889 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1890 args->auth_flavors[0] = data->pseudoflavor;
1891 if (!args->nfs_server.hostname)
1892 goto out_nomem;
1893
1894 if (!(data->flags & NFS_MOUNT_NONLM))
1895 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1896 NFS_MOUNT_LOCAL_FCNTL);
1897 else
1898 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1899 NFS_MOUNT_LOCAL_FCNTL);
1900 /*
1901 * The legacy version 6 binary mount data from userspace has a
1902 * field used only to transport selinux information into the
1903 * the kernel. To continue to support that functionality we
1904 * have a touch of selinux knowledge here in the NFS code. The
1905 * userspace code converted context=blah to just blah so we are
1906 * converting back to the full string selinux understands.
1907 */
1908 if (data->context[0]){
1909 #ifdef CONFIG_SECURITY_SELINUX
1910 int rc;
1911 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1912 if (!opts_str)
1913 return -ENOMEM;
1914 strcpy(opts_str, "context=");
1915 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1916 strcat(opts_str, &data->context[0]);
1917 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1918 kfree(opts_str);
1919 if (rc)
1920 return rc;
1921 #else
1922 return -EINVAL;
1923 #endif
1924 }
1925
1926 break;
1927 default: {
1928 int status;
1929
1930 if (nfs_parse_mount_options((char *)options, args) == 0)
1931 return -EINVAL;
1932
1933 if (!nfs_verify_server_address(sap))
1934 goto out_no_address;
1935
1936 if (args->version == 4)
1937 #ifdef CONFIG_NFS_V4
1938 return nfs4_validate_text_mount_data(options,
1939 args, dev_name);
1940 #else
1941 goto out_v4_not_compiled;
1942 #endif
1943
1944 nfs_set_port(sap, &args->nfs_server.port, 0);
1945
1946 nfs_set_mount_transport_protocol(args);
1947
1948 status = nfs_parse_devname(dev_name,
1949 &args->nfs_server.hostname,
1950 PAGE_SIZE,
1951 &args->nfs_server.export_path,
1952 NFS_MAXPATHLEN);
1953 if (!status)
1954 status = nfs_try_mount(args, mntfh);
1955
1956 kfree(args->nfs_server.export_path);
1957 args->nfs_server.export_path = NULL;
1958
1959 if (status)
1960 return status;
1961
1962 break;
1963 }
1964 }
1965
1966 #ifndef CONFIG_NFS_V3
1967 if (args->version == 3)
1968 goto out_v3_not_compiled;
1969 #endif /* !CONFIG_NFS_V3 */
1970
1971 return 0;
1972
1973 out_no_data:
1974 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1975 return -EINVAL;
1976
1977 out_no_v3:
1978 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1979 data->version);
1980 return -EINVAL;
1981
1982 out_no_sec:
1983 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1984 return -EINVAL;
1985
1986 #ifndef CONFIG_NFS_V3
1987 out_v3_not_compiled:
1988 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1989 return -EPROTONOSUPPORT;
1990 #endif /* !CONFIG_NFS_V3 */
1991
1992 #ifndef CONFIG_NFS_V4
1993 out_v4_not_compiled:
1994 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1995 return -EPROTONOSUPPORT;
1996 #endif /* !CONFIG_NFS_V4 */
1997
1998 out_nomem:
1999 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2000 return -ENOMEM;
2001
2002 out_no_address:
2003 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2004 return -EINVAL;
2005
2006 out_invalid_fh:
2007 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2008 return -EINVAL;
2009 }
2010
2011 static int
2012 nfs_compare_remount_data(struct nfs_server *nfss,
2013 struct nfs_parsed_mount_data *data)
2014 {
2015 if (data->flags != nfss->flags ||
2016 data->rsize != nfss->rsize ||
2017 data->wsize != nfss->wsize ||
2018 data->retrans != nfss->client->cl_timeout->to_retries ||
2019 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2020 data->acregmin != nfss->acregmin / HZ ||
2021 data->acregmax != nfss->acregmax / HZ ||
2022 data->acdirmin != nfss->acdirmin / HZ ||
2023 data->acdirmax != nfss->acdirmax / HZ ||
2024 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2025 data->nfs_server.port != nfss->port ||
2026 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2027 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2028 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2029 return -EINVAL;
2030
2031 return 0;
2032 }
2033
2034 static int
2035 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2036 {
2037 int error;
2038 struct nfs_server *nfss = sb->s_fs_info;
2039 struct nfs_parsed_mount_data *data;
2040 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2041 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2042 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2043
2044 /*
2045 * Userspace mount programs that send binary options generally send
2046 * them populated with default values. We have no way to know which
2047 * ones were explicitly specified. Fall back to legacy behavior and
2048 * just return success.
2049 */
2050 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2051 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2052 options->version <= 6))))
2053 return 0;
2054
2055 data = kzalloc(sizeof(*data), GFP_KERNEL);
2056 if (data == NULL)
2057 return -ENOMEM;
2058
2059 /* fill out struct with values from existing mount */
2060 data->flags = nfss->flags;
2061 data->rsize = nfss->rsize;
2062 data->wsize = nfss->wsize;
2063 data->retrans = nfss->client->cl_timeout->to_retries;
2064 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2065 data->acregmin = nfss->acregmin / HZ;
2066 data->acregmax = nfss->acregmax / HZ;
2067 data->acdirmin = nfss->acdirmin / HZ;
2068 data->acdirmax = nfss->acdirmax / HZ;
2069 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2070 data->nfs_server.port = nfss->port;
2071 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2072 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2073 data->nfs_server.addrlen);
2074
2075 /* overwrite those values with any that were specified */
2076 error = nfs_parse_mount_options((char *)options, data);
2077 if (error < 0)
2078 goto out;
2079
2080 /* compare new mount options with old ones */
2081 error = nfs_compare_remount_data(nfss, data);
2082 out:
2083 kfree(data);
2084 return error;
2085 }
2086
2087 /*
2088 * Initialise the common bits of the superblock
2089 */
2090 static inline void nfs_initialise_sb(struct super_block *sb)
2091 {
2092 struct nfs_server *server = NFS_SB(sb);
2093
2094 sb->s_magic = NFS_SUPER_MAGIC;
2095
2096 /* We probably want something more informative here */
2097 snprintf(sb->s_id, sizeof(sb->s_id),
2098 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2099
2100 if (sb->s_blocksize == 0)
2101 sb->s_blocksize = nfs_block_bits(server->wsize,
2102 &sb->s_blocksize_bits);
2103
2104 if (server->flags & NFS_MOUNT_NOAC)
2105 sb->s_flags |= MS_SYNCHRONOUS;
2106
2107 sb->s_bdi = &server->backing_dev_info;
2108
2109 nfs_super_set_maxbytes(sb, server->maxfilesize);
2110 }
2111
2112 /*
2113 * Finish setting up an NFS2/3 superblock
2114 */
2115 static void nfs_fill_super(struct super_block *sb,
2116 struct nfs_parsed_mount_data *data)
2117 {
2118 struct nfs_server *server = NFS_SB(sb);
2119
2120 sb->s_blocksize_bits = 0;
2121 sb->s_blocksize = 0;
2122 if (data->bsize)
2123 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2124
2125 if (server->nfs_client->rpc_ops->version == 3) {
2126 /* The VFS shouldn't apply the umask to mode bits. We will do
2127 * so ourselves when necessary.
2128 */
2129 sb->s_flags |= MS_POSIXACL;
2130 sb->s_time_gran = 1;
2131 }
2132
2133 sb->s_op = &nfs_sops;
2134 nfs_initialise_sb(sb);
2135 }
2136
2137 /*
2138 * Finish setting up a cloned NFS2/3 superblock
2139 */
2140 static void nfs_clone_super(struct super_block *sb,
2141 const struct super_block *old_sb)
2142 {
2143 struct nfs_server *server = NFS_SB(sb);
2144
2145 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2146 sb->s_blocksize = old_sb->s_blocksize;
2147 sb->s_maxbytes = old_sb->s_maxbytes;
2148
2149 if (server->nfs_client->rpc_ops->version == 3) {
2150 /* The VFS shouldn't apply the umask to mode bits. We will do
2151 * so ourselves when necessary.
2152 */
2153 sb->s_flags |= MS_POSIXACL;
2154 sb->s_time_gran = 1;
2155 }
2156
2157 sb->s_op = old_sb->s_op;
2158 nfs_initialise_sb(sb);
2159 }
2160
2161 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2162 {
2163 const struct nfs_server *a = s->s_fs_info;
2164 const struct rpc_clnt *clnt_a = a->client;
2165 const struct rpc_clnt *clnt_b = b->client;
2166
2167 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2168 goto Ebusy;
2169 if (a->nfs_client != b->nfs_client)
2170 goto Ebusy;
2171 if (a->flags != b->flags)
2172 goto Ebusy;
2173 if (a->wsize != b->wsize)
2174 goto Ebusy;
2175 if (a->rsize != b->rsize)
2176 goto Ebusy;
2177 if (a->acregmin != b->acregmin)
2178 goto Ebusy;
2179 if (a->acregmax != b->acregmax)
2180 goto Ebusy;
2181 if (a->acdirmin != b->acdirmin)
2182 goto Ebusy;
2183 if (a->acdirmax != b->acdirmax)
2184 goto Ebusy;
2185 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2186 goto Ebusy;
2187 return 1;
2188 Ebusy:
2189 return 0;
2190 }
2191
2192 struct nfs_sb_mountdata {
2193 struct nfs_server *server;
2194 int mntflags;
2195 };
2196
2197 static int nfs_set_super(struct super_block *s, void *data)
2198 {
2199 struct nfs_sb_mountdata *sb_mntdata = data;
2200 struct nfs_server *server = sb_mntdata->server;
2201 int ret;
2202
2203 s->s_flags = sb_mntdata->mntflags;
2204 s->s_fs_info = server;
2205 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2206 ret = set_anon_super(s, server);
2207 if (ret == 0)
2208 server->s_dev = s->s_dev;
2209 return ret;
2210 }
2211
2212 static int nfs_compare_super_address(struct nfs_server *server1,
2213 struct nfs_server *server2)
2214 {
2215 struct sockaddr *sap1, *sap2;
2216
2217 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2218 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2219
2220 if (sap1->sa_family != sap2->sa_family)
2221 return 0;
2222
2223 switch (sap1->sa_family) {
2224 case AF_INET: {
2225 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2226 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2227 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2228 return 0;
2229 if (sin1->sin_port != sin2->sin_port)
2230 return 0;
2231 break;
2232 }
2233 case AF_INET6: {
2234 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2235 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2236 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2237 return 0;
2238 if (sin1->sin6_port != sin2->sin6_port)
2239 return 0;
2240 break;
2241 }
2242 default:
2243 return 0;
2244 }
2245
2246 return 1;
2247 }
2248
2249 static int nfs_compare_super(struct super_block *sb, void *data)
2250 {
2251 struct nfs_sb_mountdata *sb_mntdata = data;
2252 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2253 int mntflags = sb_mntdata->mntflags;
2254
2255 if (!nfs_compare_super_address(old, server))
2256 return 0;
2257 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2258 if (old->flags & NFS_MOUNT_UNSHARED)
2259 return 0;
2260 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2261 return 0;
2262 return nfs_compare_mount_options(sb, server, mntflags);
2263 }
2264
2265 static int nfs_bdi_register(struct nfs_server *server)
2266 {
2267 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2268 }
2269
2270 static int nfs_get_sb(struct file_system_type *fs_type,
2271 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2272 {
2273 struct nfs_server *server = NULL;
2274 struct super_block *s;
2275 struct nfs_parsed_mount_data *data;
2276 struct nfs_fh *mntfh;
2277 struct dentry *mntroot;
2278 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2279 struct nfs_sb_mountdata sb_mntdata = {
2280 .mntflags = flags,
2281 };
2282 int error = -ENOMEM;
2283
2284 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2285 mntfh = nfs_alloc_fhandle();
2286 if (data == NULL || mntfh == NULL)
2287 goto out_free_fh;
2288
2289 security_init_mnt_opts(&data->lsm_opts);
2290
2291 /* Validate the mount data */
2292 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2293 if (error < 0)
2294 goto out;
2295
2296 #ifdef CONFIG_NFS_V4
2297 if (data->version == 4) {
2298 error = nfs4_try_mount(flags, dev_name, data, mnt);
2299 kfree(data->client_address);
2300 kfree(data->nfs_server.export_path);
2301 goto out;
2302 }
2303 #endif /* CONFIG_NFS_V4 */
2304
2305 /* Get a volume representation */
2306 server = nfs_create_server(data, mntfh);
2307 if (IS_ERR(server)) {
2308 error = PTR_ERR(server);
2309 goto out;
2310 }
2311 sb_mntdata.server = server;
2312
2313 if (server->flags & NFS_MOUNT_UNSHARED)
2314 compare_super = NULL;
2315
2316 /* Get a superblock - note that we may end up sharing one that already exists */
2317 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2318 if (IS_ERR(s)) {
2319 error = PTR_ERR(s);
2320 goto out_err_nosb;
2321 }
2322
2323 if (s->s_fs_info != server) {
2324 nfs_free_server(server);
2325 server = NULL;
2326 } else {
2327 error = nfs_bdi_register(server);
2328 if (error)
2329 goto error_splat_bdi;
2330 }
2331
2332 if (!s->s_root) {
2333 /* initial superblock/root creation */
2334 nfs_fill_super(s, data);
2335 nfs_fscache_get_super_cookie(
2336 s, data ? data->fscache_uniq : NULL, NULL);
2337 }
2338
2339 mntroot = nfs_get_root(s, mntfh);
2340 if (IS_ERR(mntroot)) {
2341 error = PTR_ERR(mntroot);
2342 goto error_splat_super;
2343 }
2344
2345 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2346 if (error)
2347 goto error_splat_root;
2348
2349 s->s_flags |= MS_ACTIVE;
2350 mnt->mnt_sb = s;
2351 mnt->mnt_root = mntroot;
2352 error = 0;
2353
2354 out:
2355 kfree(data->nfs_server.hostname);
2356 kfree(data->mount_server.hostname);
2357 kfree(data->fscache_uniq);
2358 security_free_mnt_opts(&data->lsm_opts);
2359 out_free_fh:
2360 nfs_free_fhandle(mntfh);
2361 kfree(data);
2362 return error;
2363
2364 out_err_nosb:
2365 nfs_free_server(server);
2366 goto out;
2367
2368 error_splat_root:
2369 dput(mntroot);
2370 error_splat_super:
2371 if (server && !s->s_root)
2372 bdi_unregister(&server->backing_dev_info);
2373 error_splat_bdi:
2374 deactivate_locked_super(s);
2375 goto out;
2376 }
2377
2378 /*
2379 * Ensure that we unregister the bdi before kill_anon_super
2380 * releases the device name
2381 */
2382 static void nfs_put_super(struct super_block *s)
2383 {
2384 struct nfs_server *server = NFS_SB(s);
2385
2386 bdi_unregister(&server->backing_dev_info);
2387 }
2388
2389 /*
2390 * Destroy an NFS2/3 superblock
2391 */
2392 static void nfs_kill_super(struct super_block *s)
2393 {
2394 struct nfs_server *server = NFS_SB(s);
2395
2396 kill_anon_super(s);
2397 nfs_fscache_release_super_cookie(s);
2398 nfs_free_server(server);
2399 }
2400
2401 /*
2402 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2403 */
2404 static struct dentry *
2405 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2406 const char *dev_name, void *raw_data)
2407 {
2408 struct nfs_clone_mount *data = raw_data;
2409 struct super_block *s;
2410 struct nfs_server *server;
2411 struct dentry *mntroot;
2412 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2413 struct nfs_sb_mountdata sb_mntdata = {
2414 .mntflags = flags,
2415 };
2416 int error;
2417
2418 dprintk("--> nfs_xdev_mount()\n");
2419
2420 /* create a new volume representation */
2421 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2422 if (IS_ERR(server)) {
2423 error = PTR_ERR(server);
2424 goto out_err_noserver;
2425 }
2426 sb_mntdata.server = server;
2427
2428 if (server->flags & NFS_MOUNT_UNSHARED)
2429 compare_super = NULL;
2430
2431 /* Get a superblock - note that we may end up sharing one that already exists */
2432 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2433 if (IS_ERR(s)) {
2434 error = PTR_ERR(s);
2435 goto out_err_nosb;
2436 }
2437
2438 if (s->s_fs_info != server) {
2439 nfs_free_server(server);
2440 server = NULL;
2441 } else {
2442 error = nfs_bdi_register(server);
2443 if (error)
2444 goto error_splat_bdi;
2445 }
2446
2447 if (!s->s_root) {
2448 /* initial superblock/root creation */
2449 nfs_clone_super(s, data->sb);
2450 nfs_fscache_get_super_cookie(s, NULL, data);
2451 }
2452
2453 mntroot = nfs_get_root(s, data->fh);
2454 if (IS_ERR(mntroot)) {
2455 error = PTR_ERR(mntroot);
2456 goto error_splat_super;
2457 }
2458 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2459 dput(mntroot);
2460 error = -ESTALE;
2461 goto error_splat_super;
2462 }
2463
2464 s->s_flags |= MS_ACTIVE;
2465
2466 /* clone any lsm security options from the parent to the new sb */
2467 security_sb_clone_mnt_opts(data->sb, s);
2468
2469 dprintk("<-- nfs_xdev_mount() = 0\n");
2470 return mntroot;
2471
2472 out_err_nosb:
2473 nfs_free_server(server);
2474 out_err_noserver:
2475 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2476 return ERR_PTR(error);
2477
2478 error_splat_super:
2479 if (server && !s->s_root)
2480 bdi_unregister(&server->backing_dev_info);
2481 error_splat_bdi:
2482 deactivate_locked_super(s);
2483 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2484 return ERR_PTR(error);
2485 }
2486
2487 #ifdef CONFIG_NFS_V4
2488
2489 /*
2490 * Finish setting up a cloned NFS4 superblock
2491 */
2492 static void nfs4_clone_super(struct super_block *sb,
2493 const struct super_block *old_sb)
2494 {
2495 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2496 sb->s_blocksize = old_sb->s_blocksize;
2497 sb->s_maxbytes = old_sb->s_maxbytes;
2498 sb->s_time_gran = 1;
2499 sb->s_op = old_sb->s_op;
2500 /*
2501 * The VFS shouldn't apply the umask to mode bits. We will do
2502 * so ourselves when necessary.
2503 */
2504 sb->s_flags |= MS_POSIXACL;
2505 sb->s_xattr = old_sb->s_xattr;
2506 nfs_initialise_sb(sb);
2507 }
2508
2509 /*
2510 * Set up an NFS4 superblock
2511 */
2512 static void nfs4_fill_super(struct super_block *sb)
2513 {
2514 sb->s_time_gran = 1;
2515 sb->s_op = &nfs4_sops;
2516 /*
2517 * The VFS shouldn't apply the umask to mode bits. We will do
2518 * so ourselves when necessary.
2519 */
2520 sb->s_flags |= MS_POSIXACL;
2521 sb->s_xattr = nfs4_xattr_handlers;
2522 nfs_initialise_sb(sb);
2523 }
2524
2525 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2526 {
2527 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2528 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2529 }
2530
2531 static int nfs4_validate_text_mount_data(void *options,
2532 struct nfs_parsed_mount_data *args,
2533 const char *dev_name)
2534 {
2535 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2536
2537 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2538
2539 nfs_validate_transport_protocol(args);
2540
2541 nfs4_validate_mount_flags(args);
2542
2543 if (args->version != 4) {
2544 dfprintk(MOUNT,
2545 "NFS4: Illegal mount version\n");
2546 return -EINVAL;
2547 }
2548
2549 if (args->auth_flavor_len > 1) {
2550 dfprintk(MOUNT,
2551 "NFS4: Too many RPC auth flavours specified\n");
2552 return -EINVAL;
2553 }
2554
2555 if (args->client_address == NULL) {
2556 dfprintk(MOUNT,
2557 "NFS4: mount program didn't pass callback address\n");
2558 return -EINVAL;
2559 }
2560
2561 return nfs_parse_devname(dev_name,
2562 &args->nfs_server.hostname,
2563 NFS4_MAXNAMLEN,
2564 &args->nfs_server.export_path,
2565 NFS4_MAXPATHLEN);
2566 }
2567
2568 /*
2569 * Validate NFSv4 mount options
2570 */
2571 static int nfs4_validate_mount_data(void *options,
2572 struct nfs_parsed_mount_data *args,
2573 const char *dev_name)
2574 {
2575 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2576 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2577 char *c;
2578
2579 if (data == NULL)
2580 goto out_no_data;
2581
2582 switch (data->version) {
2583 case 1:
2584 if (data->host_addrlen > sizeof(args->nfs_server.address))
2585 goto out_no_address;
2586 if (data->host_addrlen == 0)
2587 goto out_no_address;
2588 args->nfs_server.addrlen = data->host_addrlen;
2589 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2590 return -EFAULT;
2591 if (!nfs_verify_server_address(sap))
2592 goto out_no_address;
2593
2594 if (data->auth_flavourlen) {
2595 if (data->auth_flavourlen > 1)
2596 goto out_inval_auth;
2597 if (copy_from_user(&args->auth_flavors[0],
2598 data->auth_flavours,
2599 sizeof(args->auth_flavors[0])))
2600 return -EFAULT;
2601 }
2602
2603 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2604 if (IS_ERR(c))
2605 return PTR_ERR(c);
2606 args->nfs_server.hostname = c;
2607
2608 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2609 if (IS_ERR(c))
2610 return PTR_ERR(c);
2611 args->nfs_server.export_path = c;
2612 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2613
2614 c = strndup_user(data->client_addr.data, 16);
2615 if (IS_ERR(c))
2616 return PTR_ERR(c);
2617 args->client_address = c;
2618
2619 /*
2620 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2621 * can deal with.
2622 */
2623
2624 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2625 args->rsize = data->rsize;
2626 args->wsize = data->wsize;
2627 args->timeo = data->timeo;
2628 args->retrans = data->retrans;
2629 args->acregmin = data->acregmin;
2630 args->acregmax = data->acregmax;
2631 args->acdirmin = data->acdirmin;
2632 args->acdirmax = data->acdirmax;
2633 args->nfs_server.protocol = data->proto;
2634 nfs_validate_transport_protocol(args);
2635
2636 break;
2637 default:
2638 if (nfs_parse_mount_options((char *)options, args) == 0)
2639 return -EINVAL;
2640
2641 if (!nfs_verify_server_address(sap))
2642 return -EINVAL;
2643
2644 return nfs4_validate_text_mount_data(options, args, dev_name);
2645 }
2646
2647 return 0;
2648
2649 out_no_data:
2650 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2651 return -EINVAL;
2652
2653 out_inval_auth:
2654 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2655 data->auth_flavourlen);
2656 return -EINVAL;
2657
2658 out_no_address:
2659 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2660 return -EINVAL;
2661 }
2662
2663 /*
2664 * Get the superblock for the NFS4 root partition
2665 */
2666 static struct dentry *
2667 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2668 const char *dev_name, void *raw_data)
2669 {
2670 struct nfs_parsed_mount_data *data = raw_data;
2671 struct super_block *s;
2672 struct nfs_server *server;
2673 struct nfs_fh *mntfh;
2674 struct dentry *mntroot;
2675 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2676 struct nfs_sb_mountdata sb_mntdata = {
2677 .mntflags = flags,
2678 };
2679 int error = -ENOMEM;
2680
2681 mntfh = nfs_alloc_fhandle();
2682 if (data == NULL || mntfh == NULL)
2683 goto out_free_fh;
2684
2685 security_init_mnt_opts(&data->lsm_opts);
2686
2687 /* Get a volume representation */
2688 server = nfs4_create_server(data, mntfh);
2689 if (IS_ERR(server)) {
2690 error = PTR_ERR(server);
2691 goto out;
2692 }
2693 sb_mntdata.server = server;
2694
2695 if (server->flags & NFS4_MOUNT_UNSHARED)
2696 compare_super = NULL;
2697
2698 /* Get a superblock - note that we may end up sharing one that already exists */
2699 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2700 if (IS_ERR(s)) {
2701 error = PTR_ERR(s);
2702 goto out_free;
2703 }
2704
2705 if (s->s_fs_info != server) {
2706 nfs_free_server(server);
2707 server = NULL;
2708 } else {
2709 error = nfs_bdi_register(server);
2710 if (error)
2711 goto error_splat_bdi;
2712 }
2713
2714 if (!s->s_root) {
2715 /* initial superblock/root creation */
2716 nfs4_fill_super(s);
2717 nfs_fscache_get_super_cookie(
2718 s, data ? data->fscache_uniq : NULL, NULL);
2719 }
2720
2721 mntroot = nfs4_get_root(s, mntfh);
2722 if (IS_ERR(mntroot)) {
2723 error = PTR_ERR(mntroot);
2724 goto error_splat_super;
2725 }
2726
2727 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2728 if (error)
2729 goto error_splat_root;
2730
2731 s->s_flags |= MS_ACTIVE;
2732
2733 security_free_mnt_opts(&data->lsm_opts);
2734 nfs_free_fhandle(mntfh);
2735 return mntroot;
2736
2737 out:
2738 security_free_mnt_opts(&data->lsm_opts);
2739 out_free_fh:
2740 nfs_free_fhandle(mntfh);
2741 return ERR_PTR(error);
2742
2743 out_free:
2744 nfs_free_server(server);
2745 goto out;
2746
2747 error_splat_root:
2748 dput(mntroot);
2749 error_splat_super:
2750 if (server && !s->s_root)
2751 bdi_unregister(&server->backing_dev_info);
2752 error_splat_bdi:
2753 deactivate_locked_super(s);
2754 goto out;
2755 }
2756
2757 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2758 int flags, void *data, const char *hostname)
2759 {
2760 struct vfsmount *root_mnt;
2761 char *root_devname;
2762 size_t len;
2763
2764 len = strlen(hostname) + 3;
2765 root_devname = kmalloc(len, GFP_KERNEL);
2766 if (root_devname == NULL)
2767 return ERR_PTR(-ENOMEM);
2768 snprintf(root_devname, len, "%s:/", hostname);
2769 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2770 kfree(root_devname);
2771 return root_mnt;
2772 }
2773
2774 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2775 {
2776 char *page = (char *) __get_free_page(GFP_KERNEL);
2777 char *devname, *tmp;
2778
2779 if (page == NULL)
2780 return;
2781 devname = nfs_path(path->mnt->mnt_devname,
2782 path->mnt->mnt_root, path->dentry,
2783 page, PAGE_SIZE);
2784 if (IS_ERR(devname))
2785 goto out_freepage;
2786 tmp = kstrdup(devname, GFP_KERNEL);
2787 if (tmp == NULL)
2788 goto out_freepage;
2789 kfree(mnt->mnt_devname);
2790 mnt->mnt_devname = tmp;
2791 out_freepage:
2792 free_page((unsigned long)page);
2793 }
2794
2795 struct nfs_referral_count {
2796 struct list_head list;
2797 const struct task_struct *task;
2798 unsigned int referral_count;
2799 };
2800
2801 static LIST_HEAD(nfs_referral_count_list);
2802 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2803
2804 static struct nfs_referral_count *nfs_find_referral_count(void)
2805 {
2806 struct nfs_referral_count *p;
2807
2808 list_for_each_entry(p, &nfs_referral_count_list, list) {
2809 if (p->task == current)
2810 return p;
2811 }
2812 return NULL;
2813 }
2814
2815 #define NFS_MAX_NESTED_REFERRALS 2
2816
2817 static int nfs_referral_loop_protect(void)
2818 {
2819 struct nfs_referral_count *p, *new;
2820 int ret = -ENOMEM;
2821
2822 new = kmalloc(sizeof(*new), GFP_KERNEL);
2823 if (!new)
2824 goto out;
2825 new->task = current;
2826 new->referral_count = 1;
2827
2828 ret = 0;
2829 spin_lock(&nfs_referral_count_list_lock);
2830 p = nfs_find_referral_count();
2831 if (p != NULL) {
2832 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2833 ret = -ELOOP;
2834 else
2835 p->referral_count++;
2836 } else {
2837 list_add(&new->list, &nfs_referral_count_list);
2838 new = NULL;
2839 }
2840 spin_unlock(&nfs_referral_count_list_lock);
2841 kfree(new);
2842 out:
2843 return ret;
2844 }
2845
2846 static void nfs_referral_loop_unprotect(void)
2847 {
2848 struct nfs_referral_count *p;
2849
2850 spin_lock(&nfs_referral_count_list_lock);
2851 p = nfs_find_referral_count();
2852 p->referral_count--;
2853 if (p->referral_count == 0)
2854 list_del(&p->list);
2855 else
2856 p = NULL;
2857 spin_unlock(&nfs_referral_count_list_lock);
2858 kfree(p);
2859 }
2860
2861 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2862 const char *export_path, struct vfsmount *mnt_target)
2863 {
2864 struct nameidata *nd = NULL;
2865 struct mnt_namespace *ns_private;
2866 struct super_block *s;
2867 int ret;
2868
2869 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2870 if (nd == NULL)
2871 return -ENOMEM;
2872
2873 ns_private = create_mnt_ns(root_mnt);
2874 ret = PTR_ERR(ns_private);
2875 if (IS_ERR(ns_private))
2876 goto out_mntput;
2877
2878 ret = nfs_referral_loop_protect();
2879 if (ret != 0)
2880 goto out_put_mnt_ns;
2881
2882 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2883 export_path, LOOKUP_FOLLOW, nd);
2884
2885 nfs_referral_loop_unprotect();
2886 put_mnt_ns(ns_private);
2887
2888 if (ret != 0)
2889 goto out_err;
2890
2891 s = nd->path.mnt->mnt_sb;
2892 atomic_inc(&s->s_active);
2893 mnt_target->mnt_sb = s;
2894 mnt_target->mnt_root = dget(nd->path.dentry);
2895
2896 /* Correct the device pathname */
2897 nfs_fix_devname(&nd->path, mnt_target);
2898
2899 path_put(&nd->path);
2900 kfree(nd);
2901 down_write(&s->s_umount);
2902 return 0;
2903 out_put_mnt_ns:
2904 put_mnt_ns(ns_private);
2905 out_mntput:
2906 mntput(root_mnt);
2907 out_err:
2908 kfree(nd);
2909 return ret;
2910 }
2911
2912 static int nfs4_try_mount(int flags, const char *dev_name,
2913 struct nfs_parsed_mount_data *data,
2914 struct vfsmount *mnt)
2915 {
2916 char *export_path;
2917 struct vfsmount *root_mnt;
2918 int error;
2919
2920 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2921
2922 export_path = data->nfs_server.export_path;
2923 data->nfs_server.export_path = "/";
2924 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2925 data->nfs_server.hostname);
2926 data->nfs_server.export_path = export_path;
2927
2928 error = PTR_ERR(root_mnt);
2929 if (IS_ERR(root_mnt))
2930 goto out;
2931
2932 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2933
2934 out:
2935 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2936 error != 0 ? " [error]" : "");
2937 return error;
2938 }
2939
2940 /*
2941 * Get the superblock for an NFS4 mountpoint
2942 */
2943 static int nfs4_get_sb(struct file_system_type *fs_type,
2944 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2945 {
2946 struct nfs_parsed_mount_data *data;
2947 int error = -ENOMEM;
2948
2949 data = nfs_alloc_parsed_mount_data(4);
2950 if (data == NULL)
2951 goto out_free_data;
2952
2953 /* Validate the mount data */
2954 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2955 if (error < 0)
2956 goto out;
2957
2958 error = nfs4_try_mount(flags, dev_name, data, mnt);
2959
2960 out:
2961 kfree(data->client_address);
2962 kfree(data->nfs_server.export_path);
2963 kfree(data->nfs_server.hostname);
2964 kfree(data->fscache_uniq);
2965 out_free_data:
2966 kfree(data);
2967 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2968 error != 0 ? " [error]" : "");
2969 return error;
2970 }
2971
2972 static void nfs4_kill_super(struct super_block *sb)
2973 {
2974 struct nfs_server *server = NFS_SB(sb);
2975
2976 dprintk("--> %s\n", __func__);
2977 nfs_super_return_all_delegations(sb);
2978 kill_anon_super(sb);
2979 nfs_fscache_release_super_cookie(sb);
2980 nfs_free_server(server);
2981 dprintk("<-- %s\n", __func__);
2982 }
2983
2984 /*
2985 * Clone an NFS4 server record on xdev traversal (FSID-change)
2986 */
2987 static struct dentry *
2988 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2989 const char *dev_name, void *raw_data)
2990 {
2991 struct nfs_clone_mount *data = raw_data;
2992 struct super_block *s;
2993 struct nfs_server *server;
2994 struct dentry *mntroot;
2995 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2996 struct nfs_sb_mountdata sb_mntdata = {
2997 .mntflags = flags,
2998 };
2999 int error;
3000
3001 dprintk("--> nfs4_xdev_mount()\n");
3002
3003 /* create a new volume representation */
3004 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
3005 if (IS_ERR(server)) {
3006 error = PTR_ERR(server);
3007 goto out_err_noserver;
3008 }
3009 sb_mntdata.server = server;
3010
3011 if (server->flags & NFS4_MOUNT_UNSHARED)
3012 compare_super = NULL;
3013
3014 /* Get a superblock - note that we may end up sharing one that already exists */
3015 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3016 if (IS_ERR(s)) {
3017 error = PTR_ERR(s);
3018 goto out_err_nosb;
3019 }
3020
3021 if (s->s_fs_info != server) {
3022 nfs_free_server(server);
3023 server = NULL;
3024 } else {
3025 error = nfs_bdi_register(server);
3026 if (error)
3027 goto error_splat_bdi;
3028 }
3029
3030 if (!s->s_root) {
3031 /* initial superblock/root creation */
3032 nfs4_clone_super(s, data->sb);
3033 nfs_fscache_get_super_cookie(s, NULL, data);
3034 }
3035
3036 mntroot = nfs4_get_root(s, data->fh);
3037 if (IS_ERR(mntroot)) {
3038 error = PTR_ERR(mntroot);
3039 goto error_splat_super;
3040 }
3041 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3042 dput(mntroot);
3043 error = -ESTALE;
3044 goto error_splat_super;
3045 }
3046
3047 s->s_flags |= MS_ACTIVE;
3048
3049 security_sb_clone_mnt_opts(data->sb, s);
3050
3051 dprintk("<-- nfs4_xdev_mount() = 0\n");
3052 return mntroot;
3053
3054 out_err_nosb:
3055 nfs_free_server(server);
3056 out_err_noserver:
3057 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3058 return ERR_PTR(error);
3059
3060 error_splat_super:
3061 if (server && !s->s_root)
3062 bdi_unregister(&server->backing_dev_info);
3063 error_splat_bdi:
3064 deactivate_locked_super(s);
3065 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3066 return ERR_PTR(error);
3067 }
3068
3069 static struct dentry *
3070 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3071 const char *dev_name, void *raw_data)
3072 {
3073 struct nfs_clone_mount *data = raw_data;
3074 struct super_block *s;
3075 struct nfs_server *server;
3076 struct dentry *mntroot;
3077 struct nfs_fh *mntfh;
3078 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3079 struct nfs_sb_mountdata sb_mntdata = {
3080 .mntflags = flags,
3081 };
3082 int error = -ENOMEM;
3083
3084 dprintk("--> nfs4_referral_get_sb()\n");
3085
3086 mntfh = nfs_alloc_fhandle();
3087 if (mntfh == NULL)
3088 goto out_err_nofh;
3089
3090 /* create a new volume representation */
3091 server = nfs4_create_referral_server(data, mntfh);
3092 if (IS_ERR(server)) {
3093 error = PTR_ERR(server);
3094 goto out_err_noserver;
3095 }
3096 sb_mntdata.server = server;
3097
3098 if (server->flags & NFS4_MOUNT_UNSHARED)
3099 compare_super = NULL;
3100
3101 /* Get a superblock - note that we may end up sharing one that already exists */
3102 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3103 if (IS_ERR(s)) {
3104 error = PTR_ERR(s);
3105 goto out_err_nosb;
3106 }
3107
3108 if (s->s_fs_info != server) {
3109 nfs_free_server(server);
3110 server = NULL;
3111 } else {
3112 error = nfs_bdi_register(server);
3113 if (error)
3114 goto error_splat_bdi;
3115 }
3116
3117 if (!s->s_root) {
3118 /* initial superblock/root creation */
3119 nfs4_fill_super(s);
3120 nfs_fscache_get_super_cookie(s, NULL, data);
3121 }
3122
3123 mntroot = nfs4_get_root(s, mntfh);
3124 if (IS_ERR(mntroot)) {
3125 error = PTR_ERR(mntroot);
3126 goto error_splat_super;
3127 }
3128 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3129 dput(mntroot);
3130 error = -ESTALE;
3131 goto error_splat_super;
3132 }
3133
3134 s->s_flags |= MS_ACTIVE;
3135
3136 security_sb_clone_mnt_opts(data->sb, s);
3137
3138 nfs_free_fhandle(mntfh);
3139 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3140 return mntroot;
3141
3142 out_err_nosb:
3143 nfs_free_server(server);
3144 out_err_noserver:
3145 nfs_free_fhandle(mntfh);
3146 out_err_nofh:
3147 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3148 return ERR_PTR(error);
3149
3150 error_splat_super:
3151 if (server && !s->s_root)
3152 bdi_unregister(&server->backing_dev_info);
3153 error_splat_bdi:
3154 deactivate_locked_super(s);
3155 nfs_free_fhandle(mntfh);
3156 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3157 return ERR_PTR(error);
3158 }
3159
3160 /*
3161 * Create an NFS4 server record on referral traversal
3162 */
3163 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3164 int flags, const char *dev_name, void *raw_data,
3165 struct vfsmount *mnt)
3166 {
3167 struct nfs_clone_mount *data = raw_data;
3168 char *export_path;
3169 struct vfsmount *root_mnt;
3170 int error;
3171
3172 dprintk("--> nfs4_referral_get_sb()\n");
3173
3174 export_path = data->mnt_path;
3175 data->mnt_path = "/";
3176
3177 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3178 flags, data, data->hostname);
3179 data->mnt_path = export_path;
3180
3181 error = PTR_ERR(root_mnt);
3182 if (IS_ERR(root_mnt))
3183 goto out;
3184
3185 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3186 out:
3187 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3188 error != 0 ? " [error]" : "");
3189 return error;
3190 }
3191
3192 #endif /* CONFIG_NFS_V4 */
CRIS linux kernel tree