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SUNRPC: parametrize rpc_pton() by network context
[linux-2.6/libata-dev.git] / fs / nfs / super.c
blobb79f2a11c29ef1e7c18261c43cf49db45378ae8f
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 #ifdef CONFIG_NFS_V3
71 #define NFS_DEFAULT_VERSION 3
72 #else
73 #define NFS_DEFAULT_VERSION 2
74 #endif
75
76 enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
83 Opt_v2, Opt_v3, Opt_v4,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_nfsvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115 };
116
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
138 { Opt_v4, "v4" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152
153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
176 { Opt_mounthost, "mounthost=%s" },
177 { Opt_mountaddr, "mountaddr=%s" },
178
179 { Opt_lookupcache, "lookupcache=%s" },
180 { Opt_fscache_uniq, "fsc=%s" },
181 { Opt_local_lock, "local_lock=%s" },
182
183 { Opt_err, NULL }
184 };
185
186 enum {
187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
188
189 Opt_xprt_err
190 };
191
192 static const match_table_t nfs_xprt_protocol_tokens = {
193 { Opt_xprt_udp, "udp" },
194 { Opt_xprt_udp6, "udp6" },
195 { Opt_xprt_tcp, "tcp" },
196 { Opt_xprt_tcp6, "tcp6" },
197 { Opt_xprt_rdma, "rdma" },
198
199 { Opt_xprt_err, NULL }
200 };
201
202 enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209 };
210
211 static const match_table_t nfs_secflavor_tokens = {
212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
228 { Opt_sec_err, NULL }
229 };
230
231 enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236 };
237
238 static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245 };
246
247 enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252 };
253
254 static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261 };
262
263
264 static void nfs_umount_begin(struct super_block *);
265 static int nfs_statfs(struct dentry *, struct kstatfs *);
266 static int nfs_show_options(struct seq_file *, struct dentry *);
267 static int nfs_show_devname(struct seq_file *, struct dentry *);
268 static int nfs_show_path(struct seq_file *, struct dentry *);
269 static int nfs_show_stats(struct seq_file *, struct dentry *);
270 static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
272 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
274 static void nfs_put_super(struct super_block *);
275 static void nfs_kill_super(struct super_block *);
276 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
277
278 static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
281 .mount = nfs_fs_mount,
282 .kill_sb = nfs_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
284 };
285
286 struct file_system_type nfs_xdev_fs_type = {
287 .owner = THIS_MODULE,
288 .name = "nfs",
289 .mount = nfs_xdev_mount,
290 .kill_sb = nfs_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
292 };
293
294 static const struct super_operations nfs_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .put_super = nfs_put_super,
299 .statfs = nfs_statfs,
300 .evict_inode = nfs_evict_inode,
301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
305 .show_stats = nfs_show_stats,
306 .remount_fs = nfs_remount,
307 };
308
309 #ifdef CONFIG_NFS_V4
310 static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
312 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
322 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
324 static void nfs4_kill_super(struct super_block *sb);
325
326 static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .mount = nfs4_mount,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332 };
333
334 static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
337 .mount = nfs4_remote_mount,
338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340 };
341
342 struct file_system_type nfs4_xdev_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_xdev_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348 };
349
350 static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_referral_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356 };
357
358 struct file_system_type nfs4_referral_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_referral_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364 };
365
366 static const struct super_operations nfs4_sops = {
367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
370 .put_super = nfs_put_super,
371 .statfs = nfs_statfs,
372 .evict_inode = nfs4_evict_inode,
373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
377 .show_stats = nfs_show_stats,
378 .remount_fs = nfs_remount,
379 };
380 #endif
381
382 static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385 };
386
387 /*
388 * Register the NFS filesystems
389 */
390 int __init register_nfs_fs(void)
391 {
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
401 #ifdef CONFIG_NFS_V4
402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405 #endif
406 register_shrinker(&acl_shrinker);
407 return 0;
408
409 #ifdef CONFIG_NFS_V4
410 error_2:
411 nfs_unregister_sysctl();
412 #endif
413 error_1:
414 unregister_filesystem(&nfs_fs_type);
415 error_0:
416 return ret;
417 }
418
419 /*
420 * Unregister the NFS filesystems
421 */
422 void __exit unregister_nfs_fs(void)
423 {
424 unregister_shrinker(&acl_shrinker);
425 #ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
427 #endif
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type);
430 }
431
432 void nfs_sb_active(struct super_block *sb)
433 {
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
438 }
439
440 void nfs_sb_deactive(struct super_block *sb)
441 {
442 struct nfs_server *server = NFS_SB(sb);
443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
446 }
447
448 /*
449 * Deliver file system statistics to userspace
450 */
451 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
452 {
453 struct nfs_server *server = NFS_SB(dentry->d_sb);
454 unsigned char blockbits;
455 unsigned long blockres;
456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
463
464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
474 nfs_free_fattr(res.fattr);
475 if (error < 0)
476 goto out_err;
477
478 buf->f_type = NFS_SUPER_MAGIC;
479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
485 buf->f_frsize = dentry->d_sb->s_blocksize;
486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
505
506 return 0;
507
508 out_err:
509 dprintk("%s: statfs error = %d\n", __func__, -error);
510 return error;
511 }
512
513 /*
514 * Map the security flavour number to a name
515 */
516 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517 {
518 static const struct {
519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
533 { UINT_MAX, "unknown" }
534 };
535 int i;
536
537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542 }
543
544 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581 }
582
583 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585 {
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
614 nfs_show_mountd_netid(m, nfss, showdefaults);
615 }
616
617 #ifdef CONFIG_NFS_V4
618 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620 {
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625 }
626 #else
627 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629 {
630 }
631 #endif
632
633 /*
634 * Describe the mount options in force on this server representation
635 */
636 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
638 {
639 static const struct proc_nfs_info {
640 int flag;
641 const char *str;
642 const char *nostr;
643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX, ",posix", "" },
646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
653 { 0, NULL, NULL }
654 };
655 const struct proc_nfs_info *nfs_infop;
656 struct nfs_client *clp = nfss->nfs_client;
657 u32 version = clp->rpc_ops->version;
658 int local_flock, local_fcntl;
659
660 seq_printf(m, ",vers=%u", version);
661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
680 seq_printf(m, ",proto=%s",
681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
719 }
720
721 /*
722 * Describe the mount options on this VFS mountpoint
723 */
724 static int nfs_show_options(struct seq_file *m, struct dentry *root)
725 {
726 struct nfs_server *nfss = NFS_SB(root->d_sb);
727
728 nfs_show_mount_options(m, nfss, 0);
729
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733
734 return 0;
735 }
736
737 #ifdef CONFIG_NFS_V4
738 #ifdef CONFIG_NFS_V4_1
739 static void show_sessions(struct seq_file *m, struct nfs_server *server)
740 {
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743 }
744 #else
745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746 #endif
747 #endif
748
749 #ifdef CONFIG_NFS_V4
750 #ifdef CONFIG_NFS_V4_1
751 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
752 {
753 seq_printf(m, ",pnfs=");
754 if (server->pnfs_curr_ld)
755 seq_printf(m, "%s", server->pnfs_curr_ld->name);
756 else
757 seq_printf(m, "not configured");
758 }
759 #else
760 static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
761 #endif
762 #endif
763
764 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
765 {
766 char *page = (char *) __get_free_page(GFP_KERNEL);
767 char *devname, *dummy;
768 int err = 0;
769 if (!page)
770 return -ENOMEM;
771 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
772 if (IS_ERR(devname))
773 err = PTR_ERR(devname);
774 else
775 seq_escape(m, devname, " \t\n\\");
776 free_page((unsigned long)page);
777 return err;
778 }
779
780 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
781 {
782 seq_puts(m, "/");
783 return 0;
784 }
785
786 /*
787 * Present statistical information for this VFS mountpoint
788 */
789 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
790 {
791 int i, cpu;
792 struct nfs_server *nfss = NFS_SB(root->d_sb);
793 struct rpc_auth *auth = nfss->client->cl_auth;
794 struct nfs_iostats totals = { };
795
796 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
797
798 /*
799 * Display all mount option settings
800 */
801 seq_printf(m, "\n\topts:\t");
802 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
803 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
804 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
805 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
806 nfs_show_mount_options(m, nfss, 1);
807
808 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
809
810 seq_printf(m, "\n\tcaps:\t");
811 seq_printf(m, "caps=0x%x", nfss->caps);
812 seq_printf(m, ",wtmult=%u", nfss->wtmult);
813 seq_printf(m, ",dtsize=%u", nfss->dtsize);
814 seq_printf(m, ",bsize=%u", nfss->bsize);
815 seq_printf(m, ",namlen=%u", nfss->namelen);
816
817 #ifdef CONFIG_NFS_V4
818 if (nfss->nfs_client->rpc_ops->version == 4) {
819 seq_printf(m, "\n\tnfsv4:\t");
820 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
821 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
822 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
823 show_sessions(m, nfss);
824 show_pnfs(m, nfss);
825 }
826 #endif
827
828 /*
829 * Display security flavor in effect for this mount
830 */
831 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
832 if (auth->au_flavor)
833 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
834
835 /*
836 * Display superblock I/O counters
837 */
838 for_each_possible_cpu(cpu) {
839 struct nfs_iostats *stats;
840
841 preempt_disable();
842 stats = per_cpu_ptr(nfss->io_stats, cpu);
843
844 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
845 totals.events[i] += stats->events[i];
846 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
847 totals.bytes[i] += stats->bytes[i];
848 #ifdef CONFIG_NFS_FSCACHE
849 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
850 totals.fscache[i] += stats->fscache[i];
851 #endif
852
853 preempt_enable();
854 }
855
856 seq_printf(m, "\n\tevents:\t");
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 seq_printf(m, "%lu ", totals.events[i]);
859 seq_printf(m, "\n\tbytes:\t");
860 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
862 #ifdef CONFIG_NFS_FSCACHE
863 if (nfss->options & NFS_OPTION_FSCACHE) {
864 seq_printf(m, "\n\tfsc:\t");
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 seq_printf(m, "%Lu ", totals.bytes[i]);
867 }
868 #endif
869 seq_printf(m, "\n");
870
871 rpc_print_iostats(m, nfss->client);
872
873 return 0;
874 }
875
876 /*
877 * Begin unmount by attempting to remove all automounted mountpoints we added
878 * in response to xdev traversals and referrals
879 */
880 static void nfs_umount_begin(struct super_block *sb)
881 {
882 struct nfs_server *server;
883 struct rpc_clnt *rpc;
884
885 server = NFS_SB(sb);
886 /* -EIO all pending I/O */
887 rpc = server->client_acl;
888 if (!IS_ERR(rpc))
889 rpc_killall_tasks(rpc);
890 rpc = server->client;
891 if (!IS_ERR(rpc))
892 rpc_killall_tasks(rpc);
893 }
894
895 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
896 {
897 struct nfs_parsed_mount_data *data;
898
899 data = kzalloc(sizeof(*data), GFP_KERNEL);
900 if (data) {
901 data->acregmin = NFS_DEF_ACREGMIN;
902 data->acregmax = NFS_DEF_ACREGMAX;
903 data->acdirmin = NFS_DEF_ACDIRMIN;
904 data->acdirmax = NFS_DEF_ACDIRMAX;
905 data->mount_server.port = NFS_UNSPEC_PORT;
906 data->nfs_server.port = NFS_UNSPEC_PORT;
907 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
908 data->auth_flavors[0] = RPC_AUTH_UNIX;
909 data->auth_flavor_len = 1;
910 data->version = version;
911 data->minorversion = 0;
912 security_init_mnt_opts(&data->lsm_opts);
913 }
914 return data;
915 }
916
917 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
918 {
919 if (data) {
920 kfree(data->client_address);
921 kfree(data->mount_server.hostname);
922 kfree(data->nfs_server.export_path);
923 kfree(data->nfs_server.hostname);
924 kfree(data->fscache_uniq);
925 security_free_mnt_opts(&data->lsm_opts);
926 kfree(data);
927 }
928 }
929
930 /*
931 * Sanity-check a server address provided by the mount command.
932 *
933 * Address family must be initialized, and address must not be
934 * the ANY address for that family.
935 */
936 static int nfs_verify_server_address(struct sockaddr *addr)
937 {
938 switch (addr->sa_family) {
939 case AF_INET: {
940 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
941 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
942 }
943 case AF_INET6: {
944 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
945 return !ipv6_addr_any(sa);
946 }
947 }
948
949 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
950 return 0;
951 }
952
953 /*
954 * Select between a default port value and a user-specified port value.
955 * If a zero value is set, then autobind will be used.
956 */
957 static void nfs_set_port(struct sockaddr *sap, int *port,
958 const unsigned short default_port)
959 {
960 if (*port == NFS_UNSPEC_PORT)
961 *port = default_port;
962
963 rpc_set_port(sap, *port);
964 }
965
966 /*
967 * Sanity check the NFS transport protocol.
968 *
969 */
970 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
971 {
972 switch (mnt->nfs_server.protocol) {
973 case XPRT_TRANSPORT_UDP:
974 case XPRT_TRANSPORT_TCP:
975 case XPRT_TRANSPORT_RDMA:
976 break;
977 default:
978 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
979 }
980 }
981
982 /*
983 * For text based NFSv2/v3 mounts, the mount protocol transport default
984 * settings should depend upon the specified NFS transport.
985 */
986 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
987 {
988 nfs_validate_transport_protocol(mnt);
989
990 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
991 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
992 return;
993 switch (mnt->nfs_server.protocol) {
994 case XPRT_TRANSPORT_UDP:
995 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
996 break;
997 case XPRT_TRANSPORT_TCP:
998 case XPRT_TRANSPORT_RDMA:
999 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1000 }
1001 }
1002
1003 /*
1004 * Parse the value of the 'sec=' option.
1005 */
1006 static int nfs_parse_security_flavors(char *value,
1007 struct nfs_parsed_mount_data *mnt)
1008 {
1009 substring_t args[MAX_OPT_ARGS];
1010
1011 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1012
1013 switch (match_token(value, nfs_secflavor_tokens, args)) {
1014 case Opt_sec_none:
1015 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1016 break;
1017 case Opt_sec_sys:
1018 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1019 break;
1020 case Opt_sec_krb5:
1021 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1022 break;
1023 case Opt_sec_krb5i:
1024 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1025 break;
1026 case Opt_sec_krb5p:
1027 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1028 break;
1029 case Opt_sec_lkey:
1030 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1031 break;
1032 case Opt_sec_lkeyi:
1033 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1034 break;
1035 case Opt_sec_lkeyp:
1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1037 break;
1038 case Opt_sec_spkm:
1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1040 break;
1041 case Opt_sec_spkmi:
1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1043 break;
1044 case Opt_sec_spkmp:
1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1046 break;
1047 default:
1048 return 0;
1049 }
1050
1051 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1052 mnt->auth_flavor_len = 1;
1053 return 1;
1054 }
1055
1056 static int nfs_get_option_str(substring_t args[], char **option)
1057 {
1058 kfree(*option);
1059 *option = match_strdup(args);
1060 return !option;
1061 }
1062
1063 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1064 {
1065 int rc;
1066 char *string;
1067
1068 string = match_strdup(args);
1069 if (string == NULL)
1070 return -ENOMEM;
1071 rc = strict_strtoul(string, 10, option);
1072 kfree(string);
1073
1074 return rc;
1075 }
1076
1077 /*
1078 * Error-check and convert a string of mount options from user space into
1079 * a data structure. The whole mount string is processed; bad options are
1080 * skipped as they are encountered. If there were no errors, return 1;
1081 * otherwise return 0 (zero).
1082 */
1083 static int nfs_parse_mount_options(char *raw,
1084 struct nfs_parsed_mount_data *mnt)
1085 {
1086 char *p, *string, *secdata;
1087 int rc, sloppy = 0, invalid_option = 0;
1088 unsigned short protofamily = AF_UNSPEC;
1089 unsigned short mountfamily = AF_UNSPEC;
1090
1091 if (!raw) {
1092 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1093 return 1;
1094 }
1095 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1096
1097 secdata = alloc_secdata();
1098 if (!secdata)
1099 goto out_nomem;
1100
1101 rc = security_sb_copy_data(raw, secdata);
1102 if (rc)
1103 goto out_security_failure;
1104
1105 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1106 if (rc)
1107 goto out_security_failure;
1108
1109 free_secdata(secdata);
1110
1111 mnt->net = current->nsproxy->net_ns;
1112
1113 while ((p = strsep(&raw, ",")) != NULL) {
1114 substring_t args[MAX_OPT_ARGS];
1115 unsigned long option;
1116 int token;
1117
1118 if (!*p)
1119 continue;
1120
1121 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1122
1123 token = match_token(p, nfs_mount_option_tokens, args);
1124 switch (token) {
1125
1126 /*
1127 * boolean options: foo/nofoo
1128 */
1129 case Opt_soft:
1130 mnt->flags |= NFS_MOUNT_SOFT;
1131 break;
1132 case Opt_hard:
1133 mnt->flags &= ~NFS_MOUNT_SOFT;
1134 break;
1135 case Opt_posix:
1136 mnt->flags |= NFS_MOUNT_POSIX;
1137 break;
1138 case Opt_noposix:
1139 mnt->flags &= ~NFS_MOUNT_POSIX;
1140 break;
1141 case Opt_cto:
1142 mnt->flags &= ~NFS_MOUNT_NOCTO;
1143 break;
1144 case Opt_nocto:
1145 mnt->flags |= NFS_MOUNT_NOCTO;
1146 break;
1147 case Opt_ac:
1148 mnt->flags &= ~NFS_MOUNT_NOAC;
1149 break;
1150 case Opt_noac:
1151 mnt->flags |= NFS_MOUNT_NOAC;
1152 break;
1153 case Opt_lock:
1154 mnt->flags &= ~NFS_MOUNT_NONLM;
1155 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1156 NFS_MOUNT_LOCAL_FCNTL);
1157 break;
1158 case Opt_nolock:
1159 mnt->flags |= NFS_MOUNT_NONLM;
1160 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1161 NFS_MOUNT_LOCAL_FCNTL);
1162 break;
1163 case Opt_v2:
1164 mnt->flags &= ~NFS_MOUNT_VER3;
1165 mnt->version = 2;
1166 break;
1167 case Opt_v3:
1168 mnt->flags |= NFS_MOUNT_VER3;
1169 mnt->version = 3;
1170 break;
1171 case Opt_v4:
1172 mnt->flags &= ~NFS_MOUNT_VER3;
1173 mnt->version = 4;
1174 break;
1175 case Opt_udp:
1176 mnt->flags &= ~NFS_MOUNT_TCP;
1177 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1178 break;
1179 case Opt_tcp:
1180 mnt->flags |= NFS_MOUNT_TCP;
1181 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1182 break;
1183 case Opt_rdma:
1184 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1185 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1186 xprt_load_transport(p);
1187 break;
1188 case Opt_acl:
1189 mnt->flags &= ~NFS_MOUNT_NOACL;
1190 break;
1191 case Opt_noacl:
1192 mnt->flags |= NFS_MOUNT_NOACL;
1193 break;
1194 case Opt_rdirplus:
1195 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1196 break;
1197 case Opt_nordirplus:
1198 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1199 break;
1200 case Opt_sharecache:
1201 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1202 break;
1203 case Opt_nosharecache:
1204 mnt->flags |= NFS_MOUNT_UNSHARED;
1205 break;
1206 case Opt_resvport:
1207 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1208 break;
1209 case Opt_noresvport:
1210 mnt->flags |= NFS_MOUNT_NORESVPORT;
1211 break;
1212 case Opt_fscache:
1213 mnt->options |= NFS_OPTION_FSCACHE;
1214 kfree(mnt->fscache_uniq);
1215 mnt->fscache_uniq = NULL;
1216 break;
1217 case Opt_nofscache:
1218 mnt->options &= ~NFS_OPTION_FSCACHE;
1219 kfree(mnt->fscache_uniq);
1220 mnt->fscache_uniq = NULL;
1221 break;
1222
1223 /*
1224 * options that take numeric values
1225 */
1226 case Opt_port:
1227 if (nfs_get_option_ul(args, &option) ||
1228 option > USHRT_MAX)
1229 goto out_invalid_value;
1230 mnt->nfs_server.port = option;
1231 break;
1232 case Opt_rsize:
1233 if (nfs_get_option_ul(args, &option))
1234 goto out_invalid_value;
1235 mnt->rsize = option;
1236 break;
1237 case Opt_wsize:
1238 if (nfs_get_option_ul(args, &option))
1239 goto out_invalid_value;
1240 mnt->wsize = option;
1241 break;
1242 case Opt_bsize:
1243 if (nfs_get_option_ul(args, &option))
1244 goto out_invalid_value;
1245 mnt->bsize = option;
1246 break;
1247 case Opt_timeo:
1248 if (nfs_get_option_ul(args, &option) || option == 0)
1249 goto out_invalid_value;
1250 mnt->timeo = option;
1251 break;
1252 case Opt_retrans:
1253 if (nfs_get_option_ul(args, &option) || option == 0)
1254 goto out_invalid_value;
1255 mnt->retrans = option;
1256 break;
1257 case Opt_acregmin:
1258 if (nfs_get_option_ul(args, &option))
1259 goto out_invalid_value;
1260 mnt->acregmin = option;
1261 break;
1262 case Opt_acregmax:
1263 if (nfs_get_option_ul(args, &option))
1264 goto out_invalid_value;
1265 mnt->acregmax = option;
1266 break;
1267 case Opt_acdirmin:
1268 if (nfs_get_option_ul(args, &option))
1269 goto out_invalid_value;
1270 mnt->acdirmin = option;
1271 break;
1272 case Opt_acdirmax:
1273 if (nfs_get_option_ul(args, &option))
1274 goto out_invalid_value;
1275 mnt->acdirmax = option;
1276 break;
1277 case Opt_actimeo:
1278 if (nfs_get_option_ul(args, &option))
1279 goto out_invalid_value;
1280 mnt->acregmin = mnt->acregmax =
1281 mnt->acdirmin = mnt->acdirmax = option;
1282 break;
1283 case Opt_namelen:
1284 if (nfs_get_option_ul(args, &option))
1285 goto out_invalid_value;
1286 mnt->namlen = option;
1287 break;
1288 case Opt_mountport:
1289 if (nfs_get_option_ul(args, &option) ||
1290 option > USHRT_MAX)
1291 goto out_invalid_value;
1292 mnt->mount_server.port = option;
1293 break;
1294 case Opt_mountvers:
1295 if (nfs_get_option_ul(args, &option) ||
1296 option < NFS_MNT_VERSION ||
1297 option > NFS_MNT3_VERSION)
1298 goto out_invalid_value;
1299 mnt->mount_server.version = option;
1300 break;
1301 case Opt_nfsvers:
1302 if (nfs_get_option_ul(args, &option))
1303 goto out_invalid_value;
1304 switch (option) {
1305 case NFS2_VERSION:
1306 mnt->flags &= ~NFS_MOUNT_VER3;
1307 mnt->version = 2;
1308 break;
1309 case NFS3_VERSION:
1310 mnt->flags |= NFS_MOUNT_VER3;
1311 mnt->version = 3;
1312 break;
1313 case NFS4_VERSION:
1314 mnt->flags &= ~NFS_MOUNT_VER3;
1315 mnt->version = 4;
1316 break;
1317 default:
1318 goto out_invalid_value;
1319 }
1320 break;
1321 case Opt_minorversion:
1322 if (nfs_get_option_ul(args, &option))
1323 goto out_invalid_value;
1324 if (option > NFS4_MAX_MINOR_VERSION)
1325 goto out_invalid_value;
1326 mnt->minorversion = option;
1327 break;
1328
1329 /*
1330 * options that take text values
1331 */
1332 case Opt_sec:
1333 string = match_strdup(args);
1334 if (string == NULL)
1335 goto out_nomem;
1336 rc = nfs_parse_security_flavors(string, mnt);
1337 kfree(string);
1338 if (!rc) {
1339 dfprintk(MOUNT, "NFS: unrecognized "
1340 "security flavor\n");
1341 return 0;
1342 }
1343 break;
1344 case Opt_proto:
1345 string = match_strdup(args);
1346 if (string == NULL)
1347 goto out_nomem;
1348 token = match_token(string,
1349 nfs_xprt_protocol_tokens, args);
1350
1351 protofamily = AF_INET;
1352 switch (token) {
1353 case Opt_xprt_udp6:
1354 protofamily = AF_INET6;
1355 case Opt_xprt_udp:
1356 mnt->flags &= ~NFS_MOUNT_TCP;
1357 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1358 break;
1359 case Opt_xprt_tcp6:
1360 protofamily = AF_INET6;
1361 case Opt_xprt_tcp:
1362 mnt->flags |= NFS_MOUNT_TCP;
1363 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1364 break;
1365 case Opt_xprt_rdma:
1366 /* vector side protocols to TCP */
1367 mnt->flags |= NFS_MOUNT_TCP;
1368 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1369 xprt_load_transport(string);
1370 break;
1371 default:
1372 dfprintk(MOUNT, "NFS: unrecognized "
1373 "transport protocol\n");
1374 kfree(string);
1375 return 0;
1376 }
1377 kfree(string);
1378 break;
1379 case Opt_mountproto:
1380 string = match_strdup(args);
1381 if (string == NULL)
1382 goto out_nomem;
1383 token = match_token(string,
1384 nfs_xprt_protocol_tokens, args);
1385 kfree(string);
1386
1387 mountfamily = AF_INET;
1388 switch (token) {
1389 case Opt_xprt_udp6:
1390 mountfamily = AF_INET6;
1391 case Opt_xprt_udp:
1392 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1393 break;
1394 case Opt_xprt_tcp6:
1395 mountfamily = AF_INET6;
1396 case Opt_xprt_tcp:
1397 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1398 break;
1399 case Opt_xprt_rdma: /* not used for side protocols */
1400 default:
1401 dfprintk(MOUNT, "NFS: unrecognized "
1402 "transport protocol\n");
1403 return 0;
1404 }
1405 break;
1406 case Opt_addr:
1407 string = match_strdup(args);
1408 if (string == NULL)
1409 goto out_nomem;
1410 mnt->nfs_server.addrlen =
1411 rpc_pton(&init_net, string, strlen(string),
1412 (struct sockaddr *)
1413 &mnt->nfs_server.address,
1414 sizeof(mnt->nfs_server.address));
1415 kfree(string);
1416 if (mnt->nfs_server.addrlen == 0)
1417 goto out_invalid_address;
1418 break;
1419 case Opt_clientaddr:
1420 if (nfs_get_option_str(args, &mnt->client_address))
1421 goto out_nomem;
1422 break;
1423 case Opt_mounthost:
1424 if (nfs_get_option_str(args,
1425 &mnt->mount_server.hostname))
1426 goto out_nomem;
1427 break;
1428 case Opt_mountaddr:
1429 string = match_strdup(args);
1430 if (string == NULL)
1431 goto out_nomem;
1432 mnt->mount_server.addrlen =
1433 rpc_pton(&init_net, string, strlen(string),
1434 (struct sockaddr *)
1435 &mnt->mount_server.address,
1436 sizeof(mnt->mount_server.address));
1437 kfree(string);
1438 if (mnt->mount_server.addrlen == 0)
1439 goto out_invalid_address;
1440 break;
1441 case Opt_lookupcache:
1442 string = match_strdup(args);
1443 if (string == NULL)
1444 goto out_nomem;
1445 token = match_token(string,
1446 nfs_lookupcache_tokens, args);
1447 kfree(string);
1448 switch (token) {
1449 case Opt_lookupcache_all:
1450 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1451 break;
1452 case Opt_lookupcache_positive:
1453 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1454 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1455 break;
1456 case Opt_lookupcache_none:
1457 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1458 break;
1459 default:
1460 dfprintk(MOUNT, "NFS: invalid "
1461 "lookupcache argument\n");
1462 return 0;
1463 };
1464 break;
1465 case Opt_fscache_uniq:
1466 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1467 goto out_nomem;
1468 mnt->options |= NFS_OPTION_FSCACHE;
1469 break;
1470 case Opt_local_lock:
1471 string = match_strdup(args);
1472 if (string == NULL)
1473 goto out_nomem;
1474 token = match_token(string, nfs_local_lock_tokens,
1475 args);
1476 kfree(string);
1477 switch (token) {
1478 case Opt_local_lock_all:
1479 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1480 NFS_MOUNT_LOCAL_FCNTL);
1481 break;
1482 case Opt_local_lock_flock:
1483 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1484 break;
1485 case Opt_local_lock_posix:
1486 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1487 break;
1488 case Opt_local_lock_none:
1489 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1490 NFS_MOUNT_LOCAL_FCNTL);
1491 break;
1492 default:
1493 dfprintk(MOUNT, "NFS: invalid "
1494 "local_lock argument\n");
1495 return 0;
1496 };
1497 break;
1498
1499 /*
1500 * Special options
1501 */
1502 case Opt_sloppy:
1503 sloppy = 1;
1504 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1505 break;
1506 case Opt_userspace:
1507 case Opt_deprecated:
1508 dfprintk(MOUNT, "NFS: ignoring mount option "
1509 "'%s'\n", p);
1510 break;
1511
1512 default:
1513 invalid_option = 1;
1514 dfprintk(MOUNT, "NFS: unrecognized mount option "
1515 "'%s'\n", p);
1516 }
1517 }
1518
1519 if (!sloppy && invalid_option)
1520 return 0;
1521
1522 /*
1523 * verify that any proto=/mountproto= options match the address
1524 * familiies in the addr=/mountaddr= options.
1525 */
1526 if (protofamily != AF_UNSPEC &&
1527 protofamily != mnt->nfs_server.address.ss_family)
1528 goto out_proto_mismatch;
1529
1530 if (mountfamily != AF_UNSPEC) {
1531 if (mnt->mount_server.addrlen) {
1532 if (mountfamily != mnt->mount_server.address.ss_family)
1533 goto out_mountproto_mismatch;
1534 } else {
1535 if (mountfamily != mnt->nfs_server.address.ss_family)
1536 goto out_mountproto_mismatch;
1537 }
1538 }
1539
1540 return 1;
1541
1542 out_mountproto_mismatch:
1543 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1544 "option\n");
1545 return 0;
1546 out_proto_mismatch:
1547 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1548 return 0;
1549 out_invalid_address:
1550 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1551 return 0;
1552 out_invalid_value:
1553 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1554 return 0;
1555 out_nomem:
1556 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1557 return 0;
1558 out_security_failure:
1559 free_secdata(secdata);
1560 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1561 return 0;
1562 }
1563
1564 /*
1565 * Match the requested auth flavors with the list returned by
1566 * the server. Returns zero and sets the mount's authentication
1567 * flavor on success; returns -EACCES if server does not support
1568 * the requested flavor.
1569 */
1570 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1571 struct nfs_mount_request *request)
1572 {
1573 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1574
1575 /*
1576 * Certain releases of Linux's mountd return an empty
1577 * flavor list. To prevent behavioral regression with
1578 * these servers (ie. rejecting mounts that used to
1579 * succeed), revert to pre-2.6.32 behavior (no checking)
1580 * if the returned flavor list is empty.
1581 */
1582 if (server_authlist_len == 0)
1583 return 0;
1584
1585 /*
1586 * We avoid sophisticated negotiating here, as there are
1587 * plenty of cases where we can get it wrong, providing
1588 * either too little or too much security.
1589 *
1590 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1591 * flavor listed first. However, some servers list
1592 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1593 * preferred default, in args->auth_flavors[0] if user
1594 * didn't specify sec= mount option.
1595 */
1596 for (i = 0; i < args->auth_flavor_len; i++)
1597 for (j = 0; j < server_authlist_len; j++)
1598 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1599 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1600 request->auth_flavs[j]);
1601 args->auth_flavors[0] = request->auth_flavs[j];
1602 return 0;
1603 }
1604
1605 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1606 nfs_umount(request);
1607 return -EACCES;
1608 }
1609
1610 /*
1611 * Use the remote server's MOUNT service to request the NFS file handle
1612 * corresponding to the provided path.
1613 */
1614 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1615 struct nfs_fh *root_fh)
1616 {
1617 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1618 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1619 struct nfs_mount_request request = {
1620 .sap = (struct sockaddr *)
1621 &args->mount_server.address,
1622 .dirpath = args->nfs_server.export_path,
1623 .protocol = args->mount_server.protocol,
1624 .fh = root_fh,
1625 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1626 .auth_flav_len = &server_authlist_len,
1627 .auth_flavs = server_authlist,
1628 .net = args->net,
1629 };
1630 int status;
1631
1632 if (args->mount_server.version == 0) {
1633 switch (args->version) {
1634 default:
1635 args->mount_server.version = NFS_MNT3_VERSION;
1636 break;
1637 case 2:
1638 args->mount_server.version = NFS_MNT_VERSION;
1639 }
1640 }
1641 request.version = args->mount_server.version;
1642
1643 if (args->mount_server.hostname)
1644 request.hostname = args->mount_server.hostname;
1645 else
1646 request.hostname = args->nfs_server.hostname;
1647
1648 /*
1649 * Construct the mount server's address.
1650 */
1651 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1652 memcpy(request.sap, &args->nfs_server.address,
1653 args->nfs_server.addrlen);
1654 args->mount_server.addrlen = args->nfs_server.addrlen;
1655 }
1656 request.salen = args->mount_server.addrlen;
1657 nfs_set_port(request.sap, &args->mount_server.port, 0);
1658
1659 /*
1660 * Now ask the mount server to map our export path
1661 * to a file handle.
1662 */
1663 status = nfs_mount(&request);
1664 if (status != 0) {
1665 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1666 request.hostname, status);
1667 return status;
1668 }
1669
1670 /*
1671 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1672 */
1673 if (args->mount_server.version != NFS_MNT3_VERSION)
1674 return 0;
1675 return nfs_walk_authlist(args, &request);
1676 }
1677
1678 /*
1679 * Split "dev_name" into "hostname:export_path".
1680 *
1681 * The leftmost colon demarks the split between the server's hostname
1682 * and the export path. If the hostname starts with a left square
1683 * bracket, then it may contain colons.
1684 *
1685 * Note: caller frees hostname and export path, even on error.
1686 */
1687 static int nfs_parse_devname(const char *dev_name,
1688 char **hostname, size_t maxnamlen,
1689 char **export_path, size_t maxpathlen)
1690 {
1691 size_t len;
1692 char *end;
1693
1694 /* Is the host name protected with square brakcets? */
1695 if (*dev_name == '[') {
1696 end = strchr(++dev_name, ']');
1697 if (end == NULL || end[1] != ':')
1698 goto out_bad_devname;
1699
1700 len = end - dev_name;
1701 end++;
1702 } else {
1703 char *comma;
1704
1705 end = strchr(dev_name, ':');
1706 if (end == NULL)
1707 goto out_bad_devname;
1708 len = end - dev_name;
1709
1710 /* kill possible hostname list: not supported */
1711 comma = strchr(dev_name, ',');
1712 if (comma != NULL && comma < end)
1713 *comma = 0;
1714 }
1715
1716 if (len > maxnamlen)
1717 goto out_hostname;
1718
1719 /* N.B. caller will free nfs_server.hostname in all cases */
1720 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1721 if (*hostname == NULL)
1722 goto out_nomem;
1723 len = strlen(++end);
1724 if (len > maxpathlen)
1725 goto out_path;
1726 *export_path = kstrndup(end, len, GFP_KERNEL);
1727 if (!*export_path)
1728 goto out_nomem;
1729
1730 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1731 return 0;
1732
1733 out_bad_devname:
1734 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1735 return -EINVAL;
1736
1737 out_nomem:
1738 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1739 return -ENOMEM;
1740
1741 out_hostname:
1742 dfprintk(MOUNT, "NFS: server hostname too long\n");
1743 return -ENAMETOOLONG;
1744
1745 out_path:
1746 dfprintk(MOUNT, "NFS: export pathname too long\n");
1747 return -ENAMETOOLONG;
1748 }
1749
1750 /*
1751 * Validate the NFS2/NFS3 mount data
1752 * - fills in the mount root filehandle
1753 *
1754 * For option strings, user space handles the following behaviors:
1755 *
1756 * + DNS: mapping server host name to IP address ("addr=" option)
1757 *
1758 * + failure mode: how to behave if a mount request can't be handled
1759 * immediately ("fg/bg" option)
1760 *
1761 * + retry: how often to retry a mount request ("retry=" option)
1762 *
1763 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1764 * mountproto=tcp after mountproto=udp, and so on
1765 */
1766 static int nfs_validate_mount_data(void *options,
1767 struct nfs_parsed_mount_data *args,
1768 struct nfs_fh *mntfh,
1769 const char *dev_name)
1770 {
1771 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1772 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1773
1774 if (data == NULL)
1775 goto out_no_data;
1776
1777 switch (data->version) {
1778 case 1:
1779 data->namlen = 0;
1780 case 2:
1781 data->bsize = 0;
1782 case 3:
1783 if (data->flags & NFS_MOUNT_VER3)
1784 goto out_no_v3;
1785 data->root.size = NFS2_FHSIZE;
1786 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1787 case 4:
1788 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1789 goto out_no_sec;
1790 case 5:
1791 memset(data->context, 0, sizeof(data->context));
1792 case 6:
1793 if (data->flags & NFS_MOUNT_VER3) {
1794 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1795 goto out_invalid_fh;
1796 mntfh->size = data->root.size;
1797 args->version = 3;
1798 } else {
1799 mntfh->size = NFS2_FHSIZE;
1800 args->version = 2;
1801 }
1802
1803
1804 memcpy(mntfh->data, data->root.data, mntfh->size);
1805 if (mntfh->size < sizeof(mntfh->data))
1806 memset(mntfh->data + mntfh->size, 0,
1807 sizeof(mntfh->data) - mntfh->size);
1808
1809 /*
1810 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1811 * can deal with.
1812 */
1813 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1814 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1815 args->rsize = data->rsize;
1816 args->wsize = data->wsize;
1817 args->timeo = data->timeo;
1818 args->retrans = data->retrans;
1819 args->acregmin = data->acregmin;
1820 args->acregmax = data->acregmax;
1821 args->acdirmin = data->acdirmin;
1822 args->acdirmax = data->acdirmax;
1823
1824 memcpy(sap, &data->addr, sizeof(data->addr));
1825 args->nfs_server.addrlen = sizeof(data->addr);
1826 if (!nfs_verify_server_address(sap))
1827 goto out_no_address;
1828
1829 if (!(data->flags & NFS_MOUNT_TCP))
1830 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1831 /* N.B. caller will free nfs_server.hostname in all cases */
1832 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1833 args->namlen = data->namlen;
1834 args->bsize = data->bsize;
1835
1836 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1837 args->auth_flavors[0] = data->pseudoflavor;
1838 if (!args->nfs_server.hostname)
1839 goto out_nomem;
1840
1841 if (!(data->flags & NFS_MOUNT_NONLM))
1842 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1843 NFS_MOUNT_LOCAL_FCNTL);
1844 else
1845 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1846 NFS_MOUNT_LOCAL_FCNTL);
1847 /*
1848 * The legacy version 6 binary mount data from userspace has a
1849 * field used only to transport selinux information into the
1850 * the kernel. To continue to support that functionality we
1851 * have a touch of selinux knowledge here in the NFS code. The
1852 * userspace code converted context=blah to just blah so we are
1853 * converting back to the full string selinux understands.
1854 */
1855 if (data->context[0]){
1856 #ifdef CONFIG_SECURITY_SELINUX
1857 int rc;
1858 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1859 if (!opts_str)
1860 return -ENOMEM;
1861 strcpy(opts_str, "context=");
1862 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1863 strcat(opts_str, &data->context[0]);
1864 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1865 kfree(opts_str);
1866 if (rc)
1867 return rc;
1868 #else
1869 return -EINVAL;
1870 #endif
1871 }
1872
1873 break;
1874 default: {
1875 int status;
1876
1877 if (nfs_parse_mount_options((char *)options, args) == 0)
1878 return -EINVAL;
1879
1880 if (!nfs_verify_server_address(sap))
1881 goto out_no_address;
1882
1883 if (args->version == 4)
1884 #ifdef CONFIG_NFS_V4
1885 return nfs4_validate_text_mount_data(options,
1886 args, dev_name);
1887 #else
1888 goto out_v4_not_compiled;
1889 #endif
1890
1891 nfs_set_port(sap, &args->nfs_server.port, 0);
1892
1893 nfs_set_mount_transport_protocol(args);
1894
1895 status = nfs_parse_devname(dev_name,
1896 &args->nfs_server.hostname,
1897 PAGE_SIZE,
1898 &args->nfs_server.export_path,
1899 NFS_MAXPATHLEN);
1900 if (!status)
1901 status = nfs_try_mount(args, mntfh);
1902
1903 kfree(args->nfs_server.export_path);
1904 args->nfs_server.export_path = NULL;
1905
1906 if (status)
1907 return status;
1908
1909 break;
1910 }
1911 }
1912
1913 #ifndef CONFIG_NFS_V3
1914 if (args->version == 3)
1915 goto out_v3_not_compiled;
1916 #endif /* !CONFIG_NFS_V3 */
1917
1918 return 0;
1919
1920 out_no_data:
1921 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1922 return -EINVAL;
1923
1924 out_no_v3:
1925 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1926 data->version);
1927 return -EINVAL;
1928
1929 out_no_sec:
1930 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1931 return -EINVAL;
1932
1933 #ifndef CONFIG_NFS_V3
1934 out_v3_not_compiled:
1935 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1936 return -EPROTONOSUPPORT;
1937 #endif /* !CONFIG_NFS_V3 */
1938
1939 #ifndef CONFIG_NFS_V4
1940 out_v4_not_compiled:
1941 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1942 return -EPROTONOSUPPORT;
1943 #endif /* !CONFIG_NFS_V4 */
1944
1945 out_nomem:
1946 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1947 return -ENOMEM;
1948
1949 out_no_address:
1950 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1951 return -EINVAL;
1952
1953 out_invalid_fh:
1954 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1955 return -EINVAL;
1956 }
1957
1958 static int
1959 nfs_compare_remount_data(struct nfs_server *nfss,
1960 struct nfs_parsed_mount_data *data)
1961 {
1962 if (data->flags != nfss->flags ||
1963 data->rsize != nfss->rsize ||
1964 data->wsize != nfss->wsize ||
1965 data->retrans != nfss->client->cl_timeout->to_retries ||
1966 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1967 data->acregmin != nfss->acregmin / HZ ||
1968 data->acregmax != nfss->acregmax / HZ ||
1969 data->acdirmin != nfss->acdirmin / HZ ||
1970 data->acdirmax != nfss->acdirmax / HZ ||
1971 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1972 data->nfs_server.port != nfss->port ||
1973 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1974 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1975 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1976 return -EINVAL;
1977
1978 return 0;
1979 }
1980
1981 static int
1982 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1983 {
1984 int error;
1985 struct nfs_server *nfss = sb->s_fs_info;
1986 struct nfs_parsed_mount_data *data;
1987 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1988 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1989 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1990
1991 /*
1992 * Userspace mount programs that send binary options generally send
1993 * them populated with default values. We have no way to know which
1994 * ones were explicitly specified. Fall back to legacy behavior and
1995 * just return success.
1996 */
1997 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1998 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1999 options->version <= 6))))
2000 return 0;
2001
2002 data = kzalloc(sizeof(*data), GFP_KERNEL);
2003 if (data == NULL)
2004 return -ENOMEM;
2005
2006 /* fill out struct with values from existing mount */
2007 data->flags = nfss->flags;
2008 data->rsize = nfss->rsize;
2009 data->wsize = nfss->wsize;
2010 data->retrans = nfss->client->cl_timeout->to_retries;
2011 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2012 data->acregmin = nfss->acregmin / HZ;
2013 data->acregmax = nfss->acregmax / HZ;
2014 data->acdirmin = nfss->acdirmin / HZ;
2015 data->acdirmax = nfss->acdirmax / HZ;
2016 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2017 data->nfs_server.port = nfss->port;
2018 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2019 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2020 data->nfs_server.addrlen);
2021
2022 /* overwrite those values with any that were specified */
2023 error = nfs_parse_mount_options((char *)options, data);
2024 if (error < 0)
2025 goto out;
2026
2027 /*
2028 * noac is a special case. It implies -o sync, but that's not
2029 * necessarily reflected in the mtab options. do_remount_sb
2030 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2031 * remount options, so we have to explicitly reset it.
2032 */
2033 if (data->flags & NFS_MOUNT_NOAC)
2034 *flags |= MS_SYNCHRONOUS;
2035
2036 /* compare new mount options with old ones */
2037 error = nfs_compare_remount_data(nfss, data);
2038 out:
2039 kfree(data);
2040 return error;
2041 }
2042
2043 /*
2044 * Initialise the common bits of the superblock
2045 */
2046 static inline void nfs_initialise_sb(struct super_block *sb)
2047 {
2048 struct nfs_server *server = NFS_SB(sb);
2049
2050 sb->s_magic = NFS_SUPER_MAGIC;
2051
2052 /* We probably want something more informative here */
2053 snprintf(sb->s_id, sizeof(sb->s_id),
2054 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2055
2056 if (sb->s_blocksize == 0)
2057 sb->s_blocksize = nfs_block_bits(server->wsize,
2058 &sb->s_blocksize_bits);
2059
2060 sb->s_bdi = &server->backing_dev_info;
2061
2062 nfs_super_set_maxbytes(sb, server->maxfilesize);
2063 }
2064
2065 /*
2066 * Finish setting up an NFS2/3 superblock
2067 */
2068 static void nfs_fill_super(struct super_block *sb,
2069 struct nfs_parsed_mount_data *data)
2070 {
2071 struct nfs_server *server = NFS_SB(sb);
2072
2073 sb->s_blocksize_bits = 0;
2074 sb->s_blocksize = 0;
2075 if (data->bsize)
2076 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2077
2078 if (server->nfs_client->rpc_ops->version == 3) {
2079 /* The VFS shouldn't apply the umask to mode bits. We will do
2080 * so ourselves when necessary.
2081 */
2082 sb->s_flags |= MS_POSIXACL;
2083 sb->s_time_gran = 1;
2084 }
2085
2086 sb->s_op = &nfs_sops;
2087 nfs_initialise_sb(sb);
2088 }
2089
2090 /*
2091 * Finish setting up a cloned NFS2/3 superblock
2092 */
2093 static void nfs_clone_super(struct super_block *sb,
2094 const struct super_block *old_sb)
2095 {
2096 struct nfs_server *server = NFS_SB(sb);
2097
2098 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2099 sb->s_blocksize = old_sb->s_blocksize;
2100 sb->s_maxbytes = old_sb->s_maxbytes;
2101
2102 if (server->nfs_client->rpc_ops->version == 3) {
2103 /* The VFS shouldn't apply the umask to mode bits. We will do
2104 * so ourselves when necessary.
2105 */
2106 sb->s_flags |= MS_POSIXACL;
2107 sb->s_time_gran = 1;
2108 }
2109
2110 sb->s_op = old_sb->s_op;
2111 nfs_initialise_sb(sb);
2112 }
2113
2114 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2115 {
2116 const struct nfs_server *a = s->s_fs_info;
2117 const struct rpc_clnt *clnt_a = a->client;
2118 const struct rpc_clnt *clnt_b = b->client;
2119
2120 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2121 goto Ebusy;
2122 if (a->nfs_client != b->nfs_client)
2123 goto Ebusy;
2124 if (a->flags != b->flags)
2125 goto Ebusy;
2126 if (a->wsize != b->wsize)
2127 goto Ebusy;
2128 if (a->rsize != b->rsize)
2129 goto Ebusy;
2130 if (a->acregmin != b->acregmin)
2131 goto Ebusy;
2132 if (a->acregmax != b->acregmax)
2133 goto Ebusy;
2134 if (a->acdirmin != b->acdirmin)
2135 goto Ebusy;
2136 if (a->acdirmax != b->acdirmax)
2137 goto Ebusy;
2138 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2139 goto Ebusy;
2140 return 1;
2141 Ebusy:
2142 return 0;
2143 }
2144
2145 struct nfs_sb_mountdata {
2146 struct nfs_server *server;
2147 int mntflags;
2148 };
2149
2150 static int nfs_set_super(struct super_block *s, void *data)
2151 {
2152 struct nfs_sb_mountdata *sb_mntdata = data;
2153 struct nfs_server *server = sb_mntdata->server;
2154 int ret;
2155
2156 s->s_flags = sb_mntdata->mntflags;
2157 s->s_fs_info = server;
2158 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2159 ret = set_anon_super(s, server);
2160 if (ret == 0)
2161 server->s_dev = s->s_dev;
2162 return ret;
2163 }
2164
2165 static int nfs_compare_super_address(struct nfs_server *server1,
2166 struct nfs_server *server2)
2167 {
2168 struct sockaddr *sap1, *sap2;
2169
2170 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2171 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2172
2173 if (sap1->sa_family != sap2->sa_family)
2174 return 0;
2175
2176 switch (sap1->sa_family) {
2177 case AF_INET: {
2178 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2179 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2180 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2181 return 0;
2182 if (sin1->sin_port != sin2->sin_port)
2183 return 0;
2184 break;
2185 }
2186 case AF_INET6: {
2187 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2188 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2189 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2190 return 0;
2191 if (sin1->sin6_port != sin2->sin6_port)
2192 return 0;
2193 break;
2194 }
2195 default:
2196 return 0;
2197 }
2198
2199 return 1;
2200 }
2201
2202 static int nfs_compare_super(struct super_block *sb, void *data)
2203 {
2204 struct nfs_sb_mountdata *sb_mntdata = data;
2205 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2206 int mntflags = sb_mntdata->mntflags;
2207
2208 if (!nfs_compare_super_address(old, server))
2209 return 0;
2210 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2211 if (old->flags & NFS_MOUNT_UNSHARED)
2212 return 0;
2213 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2214 return 0;
2215 return nfs_compare_mount_options(sb, server, mntflags);
2216 }
2217
2218 static int nfs_bdi_register(struct nfs_server *server)
2219 {
2220 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2221 }
2222
2223 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2224 int flags, const char *dev_name, void *raw_data)
2225 {
2226 struct nfs_server *server = NULL;
2227 struct super_block *s;
2228 struct nfs_parsed_mount_data *data;
2229 struct nfs_fh *mntfh;
2230 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2231 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2232 struct nfs_sb_mountdata sb_mntdata = {
2233 .mntflags = flags,
2234 };
2235 int error;
2236
2237 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2238 mntfh = nfs_alloc_fhandle();
2239 if (data == NULL || mntfh == NULL)
2240 goto out;
2241
2242 /* Validate the mount data */
2243 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2244 if (error < 0) {
2245 mntroot = ERR_PTR(error);
2246 goto out;
2247 }
2248
2249 #ifdef CONFIG_NFS_V4
2250 if (data->version == 4) {
2251 mntroot = nfs4_try_mount(flags, dev_name, data);
2252 goto out;
2253 }
2254 #endif /* CONFIG_NFS_V4 */
2255
2256 /* Get a volume representation */
2257 server = nfs_create_server(data, mntfh);
2258 if (IS_ERR(server)) {
2259 mntroot = ERR_CAST(server);
2260 goto out;
2261 }
2262 sb_mntdata.server = server;
2263
2264 if (server->flags & NFS_MOUNT_UNSHARED)
2265 compare_super = NULL;
2266
2267 /* -o noac implies -o sync */
2268 if (server->flags & NFS_MOUNT_NOAC)
2269 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2270
2271 /* Get a superblock - note that we may end up sharing one that already exists */
2272 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2273 if (IS_ERR(s)) {
2274 mntroot = ERR_CAST(s);
2275 goto out_err_nosb;
2276 }
2277
2278 if (s->s_fs_info != server) {
2279 nfs_free_server(server);
2280 server = NULL;
2281 } else {
2282 error = nfs_bdi_register(server);
2283 if (error) {
2284 mntroot = ERR_PTR(error);
2285 goto error_splat_bdi;
2286 }
2287 }
2288
2289 if (!s->s_root) {
2290 /* initial superblock/root creation */
2291 nfs_fill_super(s, data);
2292 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2293 }
2294
2295 mntroot = nfs_get_root(s, mntfh, dev_name);
2296 if (IS_ERR(mntroot))
2297 goto error_splat_super;
2298
2299 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2300 if (error)
2301 goto error_splat_root;
2302
2303 s->s_flags |= MS_ACTIVE;
2304
2305 out:
2306 nfs_free_parsed_mount_data(data);
2307 nfs_free_fhandle(mntfh);
2308 return mntroot;
2309
2310 out_err_nosb:
2311 nfs_free_server(server);
2312 goto out;
2313
2314 error_splat_root:
2315 dput(mntroot);
2316 mntroot = ERR_PTR(error);
2317 error_splat_super:
2318 if (server && !s->s_root)
2319 bdi_unregister(&server->backing_dev_info);
2320 error_splat_bdi:
2321 deactivate_locked_super(s);
2322 goto out;
2323 }
2324
2325 /*
2326 * Ensure that we unregister the bdi before kill_anon_super
2327 * releases the device name
2328 */
2329 static void nfs_put_super(struct super_block *s)
2330 {
2331 struct nfs_server *server = NFS_SB(s);
2332
2333 bdi_unregister(&server->backing_dev_info);
2334 }
2335
2336 /*
2337 * Destroy an NFS2/3 superblock
2338 */
2339 static void nfs_kill_super(struct super_block *s)
2340 {
2341 struct nfs_server *server = NFS_SB(s);
2342
2343 kill_anon_super(s);
2344 nfs_fscache_release_super_cookie(s);
2345 nfs_free_server(server);
2346 }
2347
2348 /*
2349 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2350 */
2351 static struct dentry *
2352 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2353 const char *dev_name, void *raw_data)
2354 {
2355 struct nfs_clone_mount *data = raw_data;
2356 struct super_block *s;
2357 struct nfs_server *server;
2358 struct dentry *mntroot;
2359 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2360 struct nfs_sb_mountdata sb_mntdata = {
2361 .mntflags = flags,
2362 };
2363 int error;
2364
2365 dprintk("--> nfs_xdev_mount()\n");
2366
2367 /* create a new volume representation */
2368 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2369 if (IS_ERR(server)) {
2370 error = PTR_ERR(server);
2371 goto out_err_noserver;
2372 }
2373 sb_mntdata.server = server;
2374
2375 if (server->flags & NFS_MOUNT_UNSHARED)
2376 compare_super = NULL;
2377
2378 /* -o noac implies -o sync */
2379 if (server->flags & NFS_MOUNT_NOAC)
2380 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2381
2382 /* Get a superblock - note that we may end up sharing one that already exists */
2383 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2384 if (IS_ERR(s)) {
2385 error = PTR_ERR(s);
2386 goto out_err_nosb;
2387 }
2388
2389 if (s->s_fs_info != server) {
2390 nfs_free_server(server);
2391 server = NULL;
2392 } else {
2393 error = nfs_bdi_register(server);
2394 if (error)
2395 goto error_splat_bdi;
2396 }
2397
2398 if (!s->s_root) {
2399 /* initial superblock/root creation */
2400 nfs_clone_super(s, data->sb);
2401 nfs_fscache_get_super_cookie(s, NULL, data);
2402 }
2403
2404 mntroot = nfs_get_root(s, data->fh, dev_name);
2405 if (IS_ERR(mntroot)) {
2406 error = PTR_ERR(mntroot);
2407 goto error_splat_super;
2408 }
2409 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2410 dput(mntroot);
2411 error = -ESTALE;
2412 goto error_splat_super;
2413 }
2414
2415 s->s_flags |= MS_ACTIVE;
2416
2417 /* clone any lsm security options from the parent to the new sb */
2418 security_sb_clone_mnt_opts(data->sb, s);
2419
2420 dprintk("<-- nfs_xdev_mount() = 0\n");
2421 return mntroot;
2422
2423 out_err_nosb:
2424 nfs_free_server(server);
2425 out_err_noserver:
2426 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2427 return ERR_PTR(error);
2428
2429 error_splat_super:
2430 if (server && !s->s_root)
2431 bdi_unregister(&server->backing_dev_info);
2432 error_splat_bdi:
2433 deactivate_locked_super(s);
2434 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2435 return ERR_PTR(error);
2436 }
2437
2438 #ifdef CONFIG_NFS_V4
2439
2440 /*
2441 * Finish setting up a cloned NFS4 superblock
2442 */
2443 static void nfs4_clone_super(struct super_block *sb,
2444 const struct super_block *old_sb)
2445 {
2446 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2447 sb->s_blocksize = old_sb->s_blocksize;
2448 sb->s_maxbytes = old_sb->s_maxbytes;
2449 sb->s_time_gran = 1;
2450 sb->s_op = old_sb->s_op;
2451 /*
2452 * The VFS shouldn't apply the umask to mode bits. We will do
2453 * so ourselves when necessary.
2454 */
2455 sb->s_flags |= MS_POSIXACL;
2456 sb->s_xattr = old_sb->s_xattr;
2457 nfs_initialise_sb(sb);
2458 }
2459
2460 /*
2461 * Set up an NFS4 superblock
2462 */
2463 static void nfs4_fill_super(struct super_block *sb)
2464 {
2465 sb->s_time_gran = 1;
2466 sb->s_op = &nfs4_sops;
2467 /*
2468 * The VFS shouldn't apply the umask to mode bits. We will do
2469 * so ourselves when necessary.
2470 */
2471 sb->s_flags |= MS_POSIXACL;
2472 sb->s_xattr = nfs4_xattr_handlers;
2473 nfs_initialise_sb(sb);
2474 }
2475
2476 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2477 {
2478 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2479 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2480 }
2481
2482 static int nfs4_validate_text_mount_data(void *options,
2483 struct nfs_parsed_mount_data *args,
2484 const char *dev_name)
2485 {
2486 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2487
2488 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2489
2490 nfs_validate_transport_protocol(args);
2491
2492 nfs4_validate_mount_flags(args);
2493
2494 if (args->version != 4) {
2495 dfprintk(MOUNT,
2496 "NFS4: Illegal mount version\n");
2497 return -EINVAL;
2498 }
2499
2500 if (args->auth_flavor_len > 1) {
2501 dfprintk(MOUNT,
2502 "NFS4: Too many RPC auth flavours specified\n");
2503 return -EINVAL;
2504 }
2505
2506 if (args->client_address == NULL) {
2507 dfprintk(MOUNT,
2508 "NFS4: mount program didn't pass callback address\n");
2509 return -EINVAL;
2510 }
2511
2512 return nfs_parse_devname(dev_name,
2513 &args->nfs_server.hostname,
2514 NFS4_MAXNAMLEN,
2515 &args->nfs_server.export_path,
2516 NFS4_MAXPATHLEN);
2517 }
2518
2519 /*
2520 * Validate NFSv4 mount options
2521 */
2522 static int nfs4_validate_mount_data(void *options,
2523 struct nfs_parsed_mount_data *args,
2524 const char *dev_name)
2525 {
2526 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2527 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2528 char *c;
2529
2530 if (data == NULL)
2531 goto out_no_data;
2532
2533 switch (data->version) {
2534 case 1:
2535 if (data->host_addrlen > sizeof(args->nfs_server.address))
2536 goto out_no_address;
2537 if (data->host_addrlen == 0)
2538 goto out_no_address;
2539 args->nfs_server.addrlen = data->host_addrlen;
2540 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2541 return -EFAULT;
2542 if (!nfs_verify_server_address(sap))
2543 goto out_no_address;
2544
2545 if (data->auth_flavourlen) {
2546 if (data->auth_flavourlen > 1)
2547 goto out_inval_auth;
2548 if (copy_from_user(&args->auth_flavors[0],
2549 data->auth_flavours,
2550 sizeof(args->auth_flavors[0])))
2551 return -EFAULT;
2552 }
2553
2554 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2555 if (IS_ERR(c))
2556 return PTR_ERR(c);
2557 args->nfs_server.hostname = c;
2558
2559 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2560 if (IS_ERR(c))
2561 return PTR_ERR(c);
2562 args->nfs_server.export_path = c;
2563 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2564
2565 c = strndup_user(data->client_addr.data, 16);
2566 if (IS_ERR(c))
2567 return PTR_ERR(c);
2568 args->client_address = c;
2569
2570 /*
2571 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2572 * can deal with.
2573 */
2574
2575 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2576 args->rsize = data->rsize;
2577 args->wsize = data->wsize;
2578 args->timeo = data->timeo;
2579 args->retrans = data->retrans;
2580 args->acregmin = data->acregmin;
2581 args->acregmax = data->acregmax;
2582 args->acdirmin = data->acdirmin;
2583 args->acdirmax = data->acdirmax;
2584 args->nfs_server.protocol = data->proto;
2585 nfs_validate_transport_protocol(args);
2586
2587 break;
2588 default:
2589 if (nfs_parse_mount_options((char *)options, args) == 0)
2590 return -EINVAL;
2591
2592 if (!nfs_verify_server_address(sap))
2593 return -EINVAL;
2594
2595 return nfs4_validate_text_mount_data(options, args, dev_name);
2596 }
2597
2598 return 0;
2599
2600 out_no_data:
2601 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2602 return -EINVAL;
2603
2604 out_inval_auth:
2605 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2606 data->auth_flavourlen);
2607 return -EINVAL;
2608
2609 out_no_address:
2610 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2611 return -EINVAL;
2612 }
2613
2614 /*
2615 * Get the superblock for the NFS4 root partition
2616 */
2617 static struct dentry *
2618 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2619 const char *dev_name, void *raw_data)
2620 {
2621 struct nfs_parsed_mount_data *data = raw_data;
2622 struct super_block *s;
2623 struct nfs_server *server;
2624 struct nfs_fh *mntfh;
2625 struct dentry *mntroot;
2626 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2627 struct nfs_sb_mountdata sb_mntdata = {
2628 .mntflags = flags,
2629 };
2630 int error = -ENOMEM;
2631
2632 mntfh = nfs_alloc_fhandle();
2633 if (data == NULL || mntfh == NULL)
2634 goto out;
2635
2636 /* Get a volume representation */
2637 server = nfs4_create_server(data, mntfh);
2638 if (IS_ERR(server)) {
2639 error = PTR_ERR(server);
2640 goto out;
2641 }
2642 sb_mntdata.server = server;
2643
2644 if (server->flags & NFS4_MOUNT_UNSHARED)
2645 compare_super = NULL;
2646
2647 /* -o noac implies -o sync */
2648 if (server->flags & NFS_MOUNT_NOAC)
2649 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2650
2651 /* Get a superblock - note that we may end up sharing one that already exists */
2652 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2653 if (IS_ERR(s)) {
2654 error = PTR_ERR(s);
2655 goto out_free;
2656 }
2657
2658 if (s->s_fs_info != server) {
2659 nfs_free_server(server);
2660 server = NULL;
2661 } else {
2662 error = nfs_bdi_register(server);
2663 if (error)
2664 goto error_splat_bdi;
2665 }
2666
2667 if (!s->s_root) {
2668 /* initial superblock/root creation */
2669 nfs4_fill_super(s);
2670 nfs_fscache_get_super_cookie(
2671 s, data ? data->fscache_uniq : NULL, NULL);
2672 }
2673
2674 mntroot = nfs4_get_root(s, mntfh, dev_name);
2675 if (IS_ERR(mntroot)) {
2676 error = PTR_ERR(mntroot);
2677 goto error_splat_super;
2678 }
2679
2680 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2681 if (error)
2682 goto error_splat_root;
2683
2684 s->s_flags |= MS_ACTIVE;
2685
2686 nfs_free_fhandle(mntfh);
2687 return mntroot;
2688
2689 out:
2690 nfs_free_fhandle(mntfh);
2691 return ERR_PTR(error);
2692
2693 out_free:
2694 nfs_free_server(server);
2695 goto out;
2696
2697 error_splat_root:
2698 dput(mntroot);
2699 error_splat_super:
2700 if (server && !s->s_root)
2701 bdi_unregister(&server->backing_dev_info);
2702 error_splat_bdi:
2703 deactivate_locked_super(s);
2704 goto out;
2705 }
2706
2707 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2708 int flags, void *data, const char *hostname)
2709 {
2710 struct vfsmount *root_mnt;
2711 char *root_devname;
2712 size_t len;
2713
2714 len = strlen(hostname) + 3;
2715 root_devname = kmalloc(len, GFP_KERNEL);
2716 if (root_devname == NULL)
2717 return ERR_PTR(-ENOMEM);
2718 snprintf(root_devname, len, "%s:/", hostname);
2719 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2720 kfree(root_devname);
2721 return root_mnt;
2722 }
2723
2724 struct nfs_referral_count {
2725 struct list_head list;
2726 const struct task_struct *task;
2727 unsigned int referral_count;
2728 };
2729
2730 static LIST_HEAD(nfs_referral_count_list);
2731 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2732
2733 static struct nfs_referral_count *nfs_find_referral_count(void)
2734 {
2735 struct nfs_referral_count *p;
2736
2737 list_for_each_entry(p, &nfs_referral_count_list, list) {
2738 if (p->task == current)
2739 return p;
2740 }
2741 return NULL;
2742 }
2743
2744 #define NFS_MAX_NESTED_REFERRALS 2
2745
2746 static int nfs_referral_loop_protect(void)
2747 {
2748 struct nfs_referral_count *p, *new;
2749 int ret = -ENOMEM;
2750
2751 new = kmalloc(sizeof(*new), GFP_KERNEL);
2752 if (!new)
2753 goto out;
2754 new->task = current;
2755 new->referral_count = 1;
2756
2757 ret = 0;
2758 spin_lock(&nfs_referral_count_list_lock);
2759 p = nfs_find_referral_count();
2760 if (p != NULL) {
2761 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2762 ret = -ELOOP;
2763 else
2764 p->referral_count++;
2765 } else {
2766 list_add(&new->list, &nfs_referral_count_list);
2767 new = NULL;
2768 }
2769 spin_unlock(&nfs_referral_count_list_lock);
2770 kfree(new);
2771 out:
2772 return ret;
2773 }
2774
2775 static void nfs_referral_loop_unprotect(void)
2776 {
2777 struct nfs_referral_count *p;
2778
2779 spin_lock(&nfs_referral_count_list_lock);
2780 p = nfs_find_referral_count();
2781 p->referral_count--;
2782 if (p->referral_count == 0)
2783 list_del(&p->list);
2784 else
2785 p = NULL;
2786 spin_unlock(&nfs_referral_count_list_lock);
2787 kfree(p);
2788 }
2789
2790 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2791 const char *export_path)
2792 {
2793 struct dentry *dentry;
2794 int err;
2795
2796 if (IS_ERR(root_mnt))
2797 return ERR_CAST(root_mnt);
2798
2799 err = nfs_referral_loop_protect();
2800 if (err) {
2801 mntput(root_mnt);
2802 return ERR_PTR(err);
2803 }
2804
2805 dentry = mount_subtree(root_mnt, export_path);
2806 nfs_referral_loop_unprotect();
2807
2808 return dentry;
2809 }
2810
2811 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2812 struct nfs_parsed_mount_data *data)
2813 {
2814 char *export_path;
2815 struct vfsmount *root_mnt;
2816 struct dentry *res;
2817
2818 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2819
2820 export_path = data->nfs_server.export_path;
2821 data->nfs_server.export_path = "/";
2822 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2823 data->nfs_server.hostname);
2824 data->nfs_server.export_path = export_path;
2825
2826 res = nfs_follow_remote_path(root_mnt, export_path);
2827
2828 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2829 IS_ERR(res) ? PTR_ERR(res) : 0,
2830 IS_ERR(res) ? " [error]" : "");
2831 return res;
2832 }
2833
2834 /*
2835 * Get the superblock for an NFS4 mountpoint
2836 */
2837 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2838 int flags, const char *dev_name, void *raw_data)
2839 {
2840 struct nfs_parsed_mount_data *data;
2841 int error = -ENOMEM;
2842 struct dentry *res = ERR_PTR(-ENOMEM);
2843
2844 data = nfs_alloc_parsed_mount_data(4);
2845 if (data == NULL)
2846 goto out;
2847
2848 /* Validate the mount data */
2849 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2850 if (error < 0) {
2851 res = ERR_PTR(error);
2852 goto out;
2853 }
2854
2855 res = nfs4_try_mount(flags, dev_name, data);
2856 if (IS_ERR(res))
2857 error = PTR_ERR(res);
2858
2859 out:
2860 nfs_free_parsed_mount_data(data);
2861 dprintk("<-- nfs4_mount() = %d%s\n", error,
2862 error != 0 ? " [error]" : "");
2863 return res;
2864 }
2865
2866 static void nfs4_kill_super(struct super_block *sb)
2867 {
2868 struct nfs_server *server = NFS_SB(sb);
2869
2870 dprintk("--> %s\n", __func__);
2871 nfs_super_return_all_delegations(sb);
2872 kill_anon_super(sb);
2873 nfs_fscache_release_super_cookie(sb);
2874 nfs_free_server(server);
2875 dprintk("<-- %s\n", __func__);
2876 }
2877
2878 /*
2879 * Clone an NFS4 server record on xdev traversal (FSID-change)
2880 */
2881 static struct dentry *
2882 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2883 const char *dev_name, void *raw_data)
2884 {
2885 struct nfs_clone_mount *data = raw_data;
2886 struct super_block *s;
2887 struct nfs_server *server;
2888 struct dentry *mntroot;
2889 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2890 struct nfs_sb_mountdata sb_mntdata = {
2891 .mntflags = flags,
2892 };
2893 int error;
2894
2895 dprintk("--> nfs4_xdev_mount()\n");
2896
2897 /* create a new volume representation */
2898 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2899 if (IS_ERR(server)) {
2900 error = PTR_ERR(server);
2901 goto out_err_noserver;
2902 }
2903 sb_mntdata.server = server;
2904
2905 if (server->flags & NFS4_MOUNT_UNSHARED)
2906 compare_super = NULL;
2907
2908 /* -o noac implies -o sync */
2909 if (server->flags & NFS_MOUNT_NOAC)
2910 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2911
2912 /* Get a superblock - note that we may end up sharing one that already exists */
2913 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2914 if (IS_ERR(s)) {
2915 error = PTR_ERR(s);
2916 goto out_err_nosb;
2917 }
2918
2919 if (s->s_fs_info != server) {
2920 nfs_free_server(server);
2921 server = NULL;
2922 } else {
2923 error = nfs_bdi_register(server);
2924 if (error)
2925 goto error_splat_bdi;
2926 }
2927
2928 if (!s->s_root) {
2929 /* initial superblock/root creation */
2930 nfs4_clone_super(s, data->sb);
2931 nfs_fscache_get_super_cookie(s, NULL, data);
2932 }
2933
2934 mntroot = nfs4_get_root(s, data->fh, dev_name);
2935 if (IS_ERR(mntroot)) {
2936 error = PTR_ERR(mntroot);
2937 goto error_splat_super;
2938 }
2939 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2940 dput(mntroot);
2941 error = -ESTALE;
2942 goto error_splat_super;
2943 }
2944
2945 s->s_flags |= MS_ACTIVE;
2946
2947 security_sb_clone_mnt_opts(data->sb, s);
2948
2949 dprintk("<-- nfs4_xdev_mount() = 0\n");
2950 return mntroot;
2951
2952 out_err_nosb:
2953 nfs_free_server(server);
2954 out_err_noserver:
2955 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2956 return ERR_PTR(error);
2957
2958 error_splat_super:
2959 if (server && !s->s_root)
2960 bdi_unregister(&server->backing_dev_info);
2961 error_splat_bdi:
2962 deactivate_locked_super(s);
2963 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2964 return ERR_PTR(error);
2965 }
2966
2967 static struct dentry *
2968 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2969 const char *dev_name, void *raw_data)
2970 {
2971 struct nfs_clone_mount *data = raw_data;
2972 struct super_block *s;
2973 struct nfs_server *server;
2974 struct dentry *mntroot;
2975 struct nfs_fh *mntfh;
2976 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2977 struct nfs_sb_mountdata sb_mntdata = {
2978 .mntflags = flags,
2979 };
2980 int error = -ENOMEM;
2981
2982 dprintk("--> nfs4_referral_get_sb()\n");
2983
2984 mntfh = nfs_alloc_fhandle();
2985 if (mntfh == NULL)
2986 goto out_err_nofh;
2987
2988 /* create a new volume representation */
2989 server = nfs4_create_referral_server(data, mntfh);
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 /* -o noac implies -o sync */
3000 if (server->flags & NFS_MOUNT_NOAC)
3001 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3002
3003 /* Get a superblock - note that we may end up sharing one that already exists */
3004 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3005 if (IS_ERR(s)) {
3006 error = PTR_ERR(s);
3007 goto out_err_nosb;
3008 }
3009
3010 if (s->s_fs_info != server) {
3011 nfs_free_server(server);
3012 server = NULL;
3013 } else {
3014 error = nfs_bdi_register(server);
3015 if (error)
3016 goto error_splat_bdi;
3017 }
3018
3019 if (!s->s_root) {
3020 /* initial superblock/root creation */
3021 nfs4_fill_super(s);
3022 nfs_fscache_get_super_cookie(s, NULL, data);
3023 }
3024
3025 mntroot = nfs4_get_root(s, mntfh, dev_name);
3026 if (IS_ERR(mntroot)) {
3027 error = PTR_ERR(mntroot);
3028 goto error_splat_super;
3029 }
3030 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3031 dput(mntroot);
3032 error = -ESTALE;
3033 goto error_splat_super;
3034 }
3035
3036 s->s_flags |= MS_ACTIVE;
3037
3038 security_sb_clone_mnt_opts(data->sb, s);
3039
3040 nfs_free_fhandle(mntfh);
3041 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3042 return mntroot;
3043
3044 out_err_nosb:
3045 nfs_free_server(server);
3046 out_err_noserver:
3047 nfs_free_fhandle(mntfh);
3048 out_err_nofh:
3049 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3050 return ERR_PTR(error);
3051
3052 error_splat_super:
3053 if (server && !s->s_root)
3054 bdi_unregister(&server->backing_dev_info);
3055 error_splat_bdi:
3056 deactivate_locked_super(s);
3057 nfs_free_fhandle(mntfh);
3058 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3059 return ERR_PTR(error);
3060 }
3061
3062 /*
3063 * Create an NFS4 server record on referral traversal
3064 */
3065 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3066 int flags, const char *dev_name, void *raw_data)
3067 {
3068 struct nfs_clone_mount *data = raw_data;
3069 char *export_path;
3070 struct vfsmount *root_mnt;
3071 struct dentry *res;
3072
3073 dprintk("--> nfs4_referral_mount()\n");
3074
3075 export_path = data->mnt_path;
3076 data->mnt_path = "/";
3077
3078 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3079 flags, data, data->hostname);
3080 data->mnt_path = export_path;
3081
3082 res = nfs_follow_remote_path(root_mnt, export_path);
3083 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3084 IS_ERR(res) ? PTR_ERR(res) : 0,
3085 IS_ERR(res) ? " [error]" : "");
3086 return res;
3087 }
3088
3089 #endif /* CONFIG_NFS_V4 */
Linux 2.6 libata-dev (mirror)