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ARM: cpu topology: Add debugfs interface for cpu_power
[cmplus.git] / fs / nfs / super.c
blob8e7b61d5829a0a1637938bf9d0468887b469bdc6
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/mnt_namespace.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 #ifdef CONFIG_NFS_V3
71 #define NFS_DEFAULT_VERSION 3
72 #else
73 #define NFS_DEFAULT_VERSION 2
74 #endif
75
76 enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
83 Opt_v2, Opt_v3, Opt_v4,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_nfsvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115 };
116
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
138 { Opt_v4, "v4" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152
153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
176 { Opt_mounthost, "mounthost=%s" },
177 { Opt_mountaddr, "mountaddr=%s" },
178
179 { Opt_lookupcache, "lookupcache=%s" },
180 { Opt_fscache_uniq, "fsc=%s" },
181 { Opt_local_lock, "local_lock=%s" },
182
183 { Opt_err, NULL }
184 };
185
186 enum {
187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
188
189 Opt_xprt_err
190 };
191
192 static const match_table_t nfs_xprt_protocol_tokens = {
193 { Opt_xprt_udp, "udp" },
194 { Opt_xprt_udp6, "udp6" },
195 { Opt_xprt_tcp, "tcp" },
196 { Opt_xprt_tcp6, "tcp6" },
197 { Opt_xprt_rdma, "rdma" },
198
199 { Opt_xprt_err, NULL }
200 };
201
202 enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209 };
210
211 static const match_table_t nfs_secflavor_tokens = {
212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
228 { Opt_sec_err, NULL }
229 };
230
231 enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236 };
237
238 static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245 };
246
247 enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252 };
253
254 static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261 };
262
263
264 static void nfs_umount_begin(struct super_block *);
265 static int nfs_statfs(struct dentry *, struct kstatfs *);
266 static int nfs_show_options(struct seq_file *, struct vfsmount *);
267 static int nfs_show_devname(struct seq_file *, struct vfsmount *);
268 static int nfs_show_path(struct seq_file *, struct vfsmount *);
269 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
270 static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
272 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
274 static void nfs_put_super(struct super_block *);
275 static void nfs_kill_super(struct super_block *);
276 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
277
278 static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
281 .mount = nfs_fs_mount,
282 .kill_sb = nfs_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
284 };
285
286 struct file_system_type nfs_xdev_fs_type = {
287 .owner = THIS_MODULE,
288 .name = "nfs",
289 .mount = nfs_xdev_mount,
290 .kill_sb = nfs_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
292 };
293
294 static const struct super_operations nfs_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .put_super = nfs_put_super,
299 .statfs = nfs_statfs,
300 .evict_inode = nfs_evict_inode,
301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
305 .show_stats = nfs_show_stats,
306 .remount_fs = nfs_remount,
307 };
308
309 #ifdef CONFIG_NFS_V4
310 static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
312 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
322 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
324 static void nfs4_kill_super(struct super_block *sb);
325
326 static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .mount = nfs4_mount,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332 };
333
334 static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
337 .mount = nfs4_remote_mount,
338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340 };
341
342 struct file_system_type nfs4_xdev_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_xdev_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348 };
349
350 static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_referral_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356 };
357
358 struct file_system_type nfs4_referral_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_referral_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364 };
365
366 static const struct super_operations nfs4_sops = {
367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
370 .put_super = nfs_put_super,
371 .statfs = nfs_statfs,
372 .evict_inode = nfs4_evict_inode,
373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
377 .show_stats = nfs_show_stats,
378 .remount_fs = nfs_remount,
379 };
380 #endif
381
382 static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385 };
386
387 /*
388 * Register the NFS filesystems
389 */
390 int __init register_nfs_fs(void)
391 {
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
401 #ifdef CONFIG_NFS_V4
402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405 #endif
406 register_shrinker(&acl_shrinker);
407 return 0;
408
409 #ifdef CONFIG_NFS_V4
410 error_2:
411 nfs_unregister_sysctl();
412 #endif
413 error_1:
414 unregister_filesystem(&nfs_fs_type);
415 error_0:
416 return ret;
417 }
418
419 /*
420 * Unregister the NFS filesystems
421 */
422 void __exit unregister_nfs_fs(void)
423 {
424 unregister_shrinker(&acl_shrinker);
425 #ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
427 #endif
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type);
430 }
431
432 void nfs_sb_active(struct super_block *sb)
433 {
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
438 }
439
440 void nfs_sb_deactive(struct super_block *sb)
441 {
442 struct nfs_server *server = NFS_SB(sb);
443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
446 }
447
448 /*
449 * Deliver file system statistics to userspace
450 */
451 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
452 {
453 struct nfs_server *server = NFS_SB(dentry->d_sb);
454 unsigned char blockbits;
455 unsigned long blockres;
456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
463
464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
474 nfs_free_fattr(res.fattr);
475 if (error < 0)
476 goto out_err;
477
478 buf->f_type = NFS_SUPER_MAGIC;
479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
485 buf->f_frsize = dentry->d_sb->s_blocksize;
486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
505
506 return 0;
507
508 out_err:
509 dprintk("%s: statfs error = %d\n", __func__, -error);
510 return error;
511 }
512
513 /*
514 * Map the security flavour number to a name
515 */
516 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517 {
518 static const struct {
519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
533 { UINT_MAX, "unknown" }
534 };
535 int i;
536
537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542 }
543
544 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581 }
582
583 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585 {
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
614 nfs_show_mountd_netid(m, nfss, showdefaults);
615 }
616
617 #ifdef CONFIG_NFS_V4
618 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620 {
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625 }
626 #else
627 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629 {
630 }
631 #endif
632
633 /*
634 * Describe the mount options in force on this server representation
635 */
636 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
638 {
639 static const struct proc_nfs_info {
640 int flag;
641 const char *str;
642 const char *nostr;
643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX, ",posix", "" },
646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
653 { 0, NULL, NULL }
654 };
655 const struct proc_nfs_info *nfs_infop;
656 struct nfs_client *clp = nfss->nfs_client;
657 u32 version = clp->rpc_ops->version;
658 int local_flock, local_fcntl;
659
660 seq_printf(m, ",vers=%u", version);
661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
680 seq_printf(m, ",proto=%s",
681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
719 }
720
721 /*
722 * Describe the mount options on this VFS mountpoint
723 */
724 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
725 {
726 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
727
728 nfs_show_mount_options(m, nfss, 0);
729
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733
734 return 0;
735 }
736 #ifdef CONFIG_NFS_V4_1
737 void show_sessions(struct seq_file *m, struct nfs_server *server)
738 {
739 if (nfs4_has_session(server->nfs_client))
740 seq_printf(m, ",sessions");
741 }
742 #else
743 void show_sessions(struct seq_file *m, struct nfs_server *server) {}
744 #endif
745
746 #ifdef CONFIG_NFS_V4_1
747 void show_pnfs(struct seq_file *m, struct nfs_server *server)
748 {
749 seq_printf(m, ",pnfs=");
750 if (server->pnfs_curr_ld)
751 seq_printf(m, "%s", server->pnfs_curr_ld->name);
752 else
753 seq_printf(m, "not configured");
754 }
755 #else /* CONFIG_NFS_V4_1 */
756 void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
757 #endif /* CONFIG_NFS_V4_1 */
758
759 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
760 {
761 char *page = (char *) __get_free_page(GFP_KERNEL);
762 char *devname, *dummy;
763 int err = 0;
764 if (!page)
765 return -ENOMEM;
766 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
767 if (IS_ERR(devname))
768 err = PTR_ERR(devname);
769 else
770 seq_escape(m, devname, " \t\n\\");
771 free_page((unsigned long)page);
772 return err;
773 }
774
775 static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
776 {
777 seq_puts(m, "/");
778 return 0;
779 }
780
781 /*
782 * Present statistical information for this VFS mountpoint
783 */
784 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
785 {
786 int i, cpu;
787 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
788 struct rpc_auth *auth = nfss->client->cl_auth;
789 struct nfs_iostats totals = { };
790
791 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
792
793 /*
794 * Display all mount option settings
795 */
796 seq_printf(m, "\n\topts:\t");
797 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
798 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
799 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
800 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
801 nfs_show_mount_options(m, nfss, 1);
802
803 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
804
805 seq_printf(m, "\n\tcaps:\t");
806 seq_printf(m, "caps=0x%x", nfss->caps);
807 seq_printf(m, ",wtmult=%u", nfss->wtmult);
808 seq_printf(m, ",dtsize=%u", nfss->dtsize);
809 seq_printf(m, ",bsize=%u", nfss->bsize);
810 seq_printf(m, ",namlen=%u", nfss->namelen);
811
812 #ifdef CONFIG_NFS_V4
813 if (nfss->nfs_client->rpc_ops->version == 4) {
814 seq_printf(m, "\n\tnfsv4:\t");
815 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
816 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
817 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
818 show_sessions(m, nfss);
819 show_pnfs(m, nfss);
820 }
821 #endif
822
823 /*
824 * Display security flavor in effect for this mount
825 */
826 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
827 if (auth->au_flavor)
828 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
829
830 /*
831 * Display superblock I/O counters
832 */
833 for_each_possible_cpu(cpu) {
834 struct nfs_iostats *stats;
835
836 preempt_disable();
837 stats = per_cpu_ptr(nfss->io_stats, cpu);
838
839 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
840 totals.events[i] += stats->events[i];
841 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
842 totals.bytes[i] += stats->bytes[i];
843 #ifdef CONFIG_NFS_FSCACHE
844 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
845 totals.fscache[i] += stats->fscache[i];
846 #endif
847
848 preempt_enable();
849 }
850
851 seq_printf(m, "\n\tevents:\t");
852 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
853 seq_printf(m, "%lu ", totals.events[i]);
854 seq_printf(m, "\n\tbytes:\t");
855 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
856 seq_printf(m, "%Lu ", totals.bytes[i]);
857 #ifdef CONFIG_NFS_FSCACHE
858 if (nfss->options & NFS_OPTION_FSCACHE) {
859 seq_printf(m, "\n\tfsc:\t");
860 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
862 }
863 #endif
864 seq_printf(m, "\n");
865
866 rpc_print_iostats(m, nfss->client);
867
868 return 0;
869 }
870
871 /*
872 * Begin unmount by attempting to remove all automounted mountpoints we added
873 * in response to xdev traversals and referrals
874 */
875 static void nfs_umount_begin(struct super_block *sb)
876 {
877 struct nfs_server *server;
878 struct rpc_clnt *rpc;
879
880 server = NFS_SB(sb);
881 /* -EIO all pending I/O */
882 rpc = server->client_acl;
883 if (!IS_ERR(rpc))
884 rpc_killall_tasks(rpc);
885 rpc = server->client;
886 if (!IS_ERR(rpc))
887 rpc_killall_tasks(rpc);
888 }
889
890 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
891 {
892 struct nfs_parsed_mount_data *data;
893
894 data = kzalloc(sizeof(*data), GFP_KERNEL);
895 if (data) {
896 data->acregmin = NFS_DEF_ACREGMIN;
897 data->acregmax = NFS_DEF_ACREGMAX;
898 data->acdirmin = NFS_DEF_ACDIRMIN;
899 data->acdirmax = NFS_DEF_ACDIRMAX;
900 data->mount_server.port = NFS_UNSPEC_PORT;
901 data->nfs_server.port = NFS_UNSPEC_PORT;
902 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
903 data->auth_flavors[0] = RPC_AUTH_UNIX;
904 data->auth_flavor_len = 1;
905 data->version = version;
906 data->minorversion = 0;
907 security_init_mnt_opts(&data->lsm_opts);
908 }
909 return data;
910 }
911
912 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
913 {
914 if (data) {
915 kfree(data->client_address);
916 kfree(data->mount_server.hostname);
917 kfree(data->nfs_server.export_path);
918 kfree(data->nfs_server.hostname);
919 kfree(data->fscache_uniq);
920 security_free_mnt_opts(&data->lsm_opts);
921 kfree(data);
922 }
923 }
924
925 /*
926 * Sanity-check a server address provided by the mount command.
927 *
928 * Address family must be initialized, and address must not be
929 * the ANY address for that family.
930 */
931 static int nfs_verify_server_address(struct sockaddr *addr)
932 {
933 switch (addr->sa_family) {
934 case AF_INET: {
935 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
936 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
937 }
938 case AF_INET6: {
939 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
940 return !ipv6_addr_any(sa);
941 }
942 }
943
944 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
945 return 0;
946 }
947
948 /*
949 * Select between a default port value and a user-specified port value.
950 * If a zero value is set, then autobind will be used.
951 */
952 static void nfs_set_port(struct sockaddr *sap, int *port,
953 const unsigned short default_port)
954 {
955 if (*port == NFS_UNSPEC_PORT)
956 *port = default_port;
957
958 rpc_set_port(sap, *port);
959 }
960
961 /*
962 * Sanity check the NFS transport protocol.
963 *
964 */
965 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
966 {
967 switch (mnt->nfs_server.protocol) {
968 case XPRT_TRANSPORT_UDP:
969 case XPRT_TRANSPORT_TCP:
970 case XPRT_TRANSPORT_RDMA:
971 break;
972 default:
973 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
974 }
975 }
976
977 /*
978 * For text based NFSv2/v3 mounts, the mount protocol transport default
979 * settings should depend upon the specified NFS transport.
980 */
981 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
982 {
983 nfs_validate_transport_protocol(mnt);
984
985 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
986 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
987 return;
988 switch (mnt->nfs_server.protocol) {
989 case XPRT_TRANSPORT_UDP:
990 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
991 break;
992 case XPRT_TRANSPORT_TCP:
993 case XPRT_TRANSPORT_RDMA:
994 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
995 }
996 }
997
998 /*
999 * Parse the value of the 'sec=' option.
1000 */
1001 static int nfs_parse_security_flavors(char *value,
1002 struct nfs_parsed_mount_data *mnt)
1003 {
1004 substring_t args[MAX_OPT_ARGS];
1005
1006 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1007
1008 switch (match_token(value, nfs_secflavor_tokens, args)) {
1009 case Opt_sec_none:
1010 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1011 break;
1012 case Opt_sec_sys:
1013 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1014 break;
1015 case Opt_sec_krb5:
1016 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1017 break;
1018 case Opt_sec_krb5i:
1019 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1020 break;
1021 case Opt_sec_krb5p:
1022 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1023 break;
1024 case Opt_sec_lkey:
1025 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1026 break;
1027 case Opt_sec_lkeyi:
1028 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1029 break;
1030 case Opt_sec_lkeyp:
1031 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1032 break;
1033 case Opt_sec_spkm:
1034 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1035 break;
1036 case Opt_sec_spkmi:
1037 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1038 break;
1039 case Opt_sec_spkmp:
1040 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1041 break;
1042 default:
1043 return 0;
1044 }
1045
1046 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1047 mnt->auth_flavor_len = 1;
1048 return 1;
1049 }
1050
1051 static int nfs_get_option_str(substring_t args[], char **option)
1052 {
1053 kfree(*option);
1054 *option = match_strdup(args);
1055 return !option;
1056 }
1057
1058 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1059 {
1060 int rc;
1061 char *string;
1062
1063 string = match_strdup(args);
1064 if (string == NULL)
1065 return -ENOMEM;
1066 rc = strict_strtoul(string, 10, option);
1067 kfree(string);
1068
1069 return rc;
1070 }
1071
1072 /*
1073 * Error-check and convert a string of mount options from user space into
1074 * a data structure. The whole mount string is processed; bad options are
1075 * skipped as they are encountered. If there were no errors, return 1;
1076 * otherwise return 0 (zero).
1077 */
1078 static int nfs_parse_mount_options(char *raw,
1079 struct nfs_parsed_mount_data *mnt)
1080 {
1081 char *p, *string, *secdata;
1082 int rc, sloppy = 0, invalid_option = 0;
1083 unsigned short protofamily = AF_UNSPEC;
1084 unsigned short mountfamily = AF_UNSPEC;
1085
1086 if (!raw) {
1087 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1088 return 1;
1089 }
1090 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1091
1092 secdata = alloc_secdata();
1093 if (!secdata)
1094 goto out_nomem;
1095
1096 rc = security_sb_copy_data(raw, secdata);
1097 if (rc)
1098 goto out_security_failure;
1099
1100 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1101 if (rc)
1102 goto out_security_failure;
1103
1104 free_secdata(secdata);
1105
1106 while ((p = strsep(&raw, ",")) != NULL) {
1107 substring_t args[MAX_OPT_ARGS];
1108 unsigned long option;
1109 int token;
1110
1111 if (!*p)
1112 continue;
1113
1114 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1115
1116 token = match_token(p, nfs_mount_option_tokens, args);
1117 switch (token) {
1118
1119 /*
1120 * boolean options: foo/nofoo
1121 */
1122 case Opt_soft:
1123 mnt->flags |= NFS_MOUNT_SOFT;
1124 break;
1125 case Opt_hard:
1126 mnt->flags &= ~NFS_MOUNT_SOFT;
1127 break;
1128 case Opt_posix:
1129 mnt->flags |= NFS_MOUNT_POSIX;
1130 break;
1131 case Opt_noposix:
1132 mnt->flags &= ~NFS_MOUNT_POSIX;
1133 break;
1134 case Opt_cto:
1135 mnt->flags &= ~NFS_MOUNT_NOCTO;
1136 break;
1137 case Opt_nocto:
1138 mnt->flags |= NFS_MOUNT_NOCTO;
1139 break;
1140 case Opt_ac:
1141 mnt->flags &= ~NFS_MOUNT_NOAC;
1142 break;
1143 case Opt_noac:
1144 mnt->flags |= NFS_MOUNT_NOAC;
1145 break;
1146 case Opt_lock:
1147 mnt->flags &= ~NFS_MOUNT_NONLM;
1148 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1149 NFS_MOUNT_LOCAL_FCNTL);
1150 break;
1151 case Opt_nolock:
1152 mnt->flags |= NFS_MOUNT_NONLM;
1153 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1154 NFS_MOUNT_LOCAL_FCNTL);
1155 break;
1156 case Opt_v2:
1157 mnt->flags &= ~NFS_MOUNT_VER3;
1158 mnt->version = 2;
1159 break;
1160 case Opt_v3:
1161 mnt->flags |= NFS_MOUNT_VER3;
1162 mnt->version = 3;
1163 break;
1164 case Opt_v4:
1165 mnt->flags &= ~NFS_MOUNT_VER3;
1166 mnt->version = 4;
1167 break;
1168 case Opt_udp:
1169 mnt->flags &= ~NFS_MOUNT_TCP;
1170 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1171 break;
1172 case Opt_tcp:
1173 mnt->flags |= NFS_MOUNT_TCP;
1174 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1175 break;
1176 case Opt_rdma:
1177 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1178 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1179 xprt_load_transport(p);
1180 break;
1181 case Opt_acl:
1182 mnt->flags &= ~NFS_MOUNT_NOACL;
1183 break;
1184 case Opt_noacl:
1185 mnt->flags |= NFS_MOUNT_NOACL;
1186 break;
1187 case Opt_rdirplus:
1188 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1189 break;
1190 case Opt_nordirplus:
1191 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1192 break;
1193 case Opt_sharecache:
1194 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1195 break;
1196 case Opt_nosharecache:
1197 mnt->flags |= NFS_MOUNT_UNSHARED;
1198 break;
1199 case Opt_resvport:
1200 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1201 break;
1202 case Opt_noresvport:
1203 mnt->flags |= NFS_MOUNT_NORESVPORT;
1204 break;
1205 case Opt_fscache:
1206 mnt->options |= NFS_OPTION_FSCACHE;
1207 kfree(mnt->fscache_uniq);
1208 mnt->fscache_uniq = NULL;
1209 break;
1210 case Opt_nofscache:
1211 mnt->options &= ~NFS_OPTION_FSCACHE;
1212 kfree(mnt->fscache_uniq);
1213 mnt->fscache_uniq = NULL;
1214 break;
1215
1216 /*
1217 * options that take numeric values
1218 */
1219 case Opt_port:
1220 if (nfs_get_option_ul(args, &option) ||
1221 option > USHRT_MAX)
1222 goto out_invalid_value;
1223 mnt->nfs_server.port = option;
1224 break;
1225 case Opt_rsize:
1226 if (nfs_get_option_ul(args, &option))
1227 goto out_invalid_value;
1228 mnt->rsize = option;
1229 break;
1230 case Opt_wsize:
1231 if (nfs_get_option_ul(args, &option))
1232 goto out_invalid_value;
1233 mnt->wsize = option;
1234 break;
1235 case Opt_bsize:
1236 if (nfs_get_option_ul(args, &option))
1237 goto out_invalid_value;
1238 mnt->bsize = option;
1239 break;
1240 case Opt_timeo:
1241 if (nfs_get_option_ul(args, &option) || option == 0)
1242 goto out_invalid_value;
1243 mnt->timeo = option;
1244 break;
1245 case Opt_retrans:
1246 if (nfs_get_option_ul(args, &option) || option == 0)
1247 goto out_invalid_value;
1248 mnt->retrans = option;
1249 break;
1250 case Opt_acregmin:
1251 if (nfs_get_option_ul(args, &option))
1252 goto out_invalid_value;
1253 mnt->acregmin = option;
1254 break;
1255 case Opt_acregmax:
1256 if (nfs_get_option_ul(args, &option))
1257 goto out_invalid_value;
1258 mnt->acregmax = option;
1259 break;
1260 case Opt_acdirmin:
1261 if (nfs_get_option_ul(args, &option))
1262 goto out_invalid_value;
1263 mnt->acdirmin = option;
1264 break;
1265 case Opt_acdirmax:
1266 if (nfs_get_option_ul(args, &option))
1267 goto out_invalid_value;
1268 mnt->acdirmax = option;
1269 break;
1270 case Opt_actimeo:
1271 if (nfs_get_option_ul(args, &option))
1272 goto out_invalid_value;
1273 mnt->acregmin = mnt->acregmax =
1274 mnt->acdirmin = mnt->acdirmax = option;
1275 break;
1276 case Opt_namelen:
1277 if (nfs_get_option_ul(args, &option))
1278 goto out_invalid_value;
1279 mnt->namlen = option;
1280 break;
1281 case Opt_mountport:
1282 if (nfs_get_option_ul(args, &option) ||
1283 option > USHRT_MAX)
1284 goto out_invalid_value;
1285 mnt->mount_server.port = option;
1286 break;
1287 case Opt_mountvers:
1288 if (nfs_get_option_ul(args, &option) ||
1289 option < NFS_MNT_VERSION ||
1290 option > NFS_MNT3_VERSION)
1291 goto out_invalid_value;
1292 mnt->mount_server.version = option;
1293 break;
1294 case Opt_nfsvers:
1295 if (nfs_get_option_ul(args, &option))
1296 goto out_invalid_value;
1297 switch (option) {
1298 case NFS2_VERSION:
1299 mnt->flags &= ~NFS_MOUNT_VER3;
1300 mnt->version = 2;
1301 break;
1302 case NFS3_VERSION:
1303 mnt->flags |= NFS_MOUNT_VER3;
1304 mnt->version = 3;
1305 break;
1306 case NFS4_VERSION:
1307 mnt->flags &= ~NFS_MOUNT_VER3;
1308 mnt->version = 4;
1309 break;
1310 default:
1311 goto out_invalid_value;
1312 }
1313 break;
1314 case Opt_minorversion:
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 if (option > NFS4_MAX_MINOR_VERSION)
1318 goto out_invalid_value;
1319 mnt->minorversion = option;
1320 break;
1321
1322 /*
1323 * options that take text values
1324 */
1325 case Opt_sec:
1326 string = match_strdup(args);
1327 if (string == NULL)
1328 goto out_nomem;
1329 rc = nfs_parse_security_flavors(string, mnt);
1330 kfree(string);
1331 if (!rc) {
1332 dfprintk(MOUNT, "NFS: unrecognized "
1333 "security flavor\n");
1334 return 0;
1335 }
1336 break;
1337 case Opt_proto:
1338 string = match_strdup(args);
1339 if (string == NULL)
1340 goto out_nomem;
1341 token = match_token(string,
1342 nfs_xprt_protocol_tokens, args);
1343
1344 protofamily = AF_INET;
1345 switch (token) {
1346 case Opt_xprt_udp6:
1347 protofamily = AF_INET6;
1348 case Opt_xprt_udp:
1349 mnt->flags &= ~NFS_MOUNT_TCP;
1350 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1351 break;
1352 case Opt_xprt_tcp6:
1353 protofamily = AF_INET6;
1354 case Opt_xprt_tcp:
1355 mnt->flags |= NFS_MOUNT_TCP;
1356 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1357 break;
1358 case Opt_xprt_rdma:
1359 /* vector side protocols to TCP */
1360 mnt->flags |= NFS_MOUNT_TCP;
1361 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1362 xprt_load_transport(string);
1363 break;
1364 default:
1365 dfprintk(MOUNT, "NFS: unrecognized "
1366 "transport protocol\n");
1367 kfree(string);
1368 return 0;
1369 }
1370 kfree(string);
1371 break;
1372 case Opt_mountproto:
1373 string = match_strdup(args);
1374 if (string == NULL)
1375 goto out_nomem;
1376 token = match_token(string,
1377 nfs_xprt_protocol_tokens, args);
1378 kfree(string);
1379
1380 mountfamily = AF_INET;
1381 switch (token) {
1382 case Opt_xprt_udp6:
1383 mountfamily = AF_INET6;
1384 case Opt_xprt_udp:
1385 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1386 break;
1387 case Opt_xprt_tcp6:
1388 mountfamily = AF_INET6;
1389 case Opt_xprt_tcp:
1390 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1391 break;
1392 case Opt_xprt_rdma: /* not used for side protocols */
1393 default:
1394 dfprintk(MOUNT, "NFS: unrecognized "
1395 "transport protocol\n");
1396 return 0;
1397 }
1398 break;
1399 case Opt_addr:
1400 string = match_strdup(args);
1401 if (string == NULL)
1402 goto out_nomem;
1403 mnt->nfs_server.addrlen =
1404 rpc_pton(string, strlen(string),
1405 (struct sockaddr *)
1406 &mnt->nfs_server.address,
1407 sizeof(mnt->nfs_server.address));
1408 kfree(string);
1409 if (mnt->nfs_server.addrlen == 0)
1410 goto out_invalid_address;
1411 break;
1412 case Opt_clientaddr:
1413 if (nfs_get_option_str(args, &mnt->client_address))
1414 goto out_nomem;
1415 break;
1416 case Opt_mounthost:
1417 if (nfs_get_option_str(args,
1418 &mnt->mount_server.hostname))
1419 goto out_nomem;
1420 break;
1421 case Opt_mountaddr:
1422 string = match_strdup(args);
1423 if (string == NULL)
1424 goto out_nomem;
1425 mnt->mount_server.addrlen =
1426 rpc_pton(string, strlen(string),
1427 (struct sockaddr *)
1428 &mnt->mount_server.address,
1429 sizeof(mnt->mount_server.address));
1430 kfree(string);
1431 if (mnt->mount_server.addrlen == 0)
1432 goto out_invalid_address;
1433 break;
1434 case Opt_lookupcache:
1435 string = match_strdup(args);
1436 if (string == NULL)
1437 goto out_nomem;
1438 token = match_token(string,
1439 nfs_lookupcache_tokens, args);
1440 kfree(string);
1441 switch (token) {
1442 case Opt_lookupcache_all:
1443 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1444 break;
1445 case Opt_lookupcache_positive:
1446 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1447 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1448 break;
1449 case Opt_lookupcache_none:
1450 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1451 break;
1452 default:
1453 dfprintk(MOUNT, "NFS: invalid "
1454 "lookupcache argument\n");
1455 return 0;
1456 };
1457 break;
1458 case Opt_fscache_uniq:
1459 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1460 goto out_nomem;
1461 mnt->options |= NFS_OPTION_FSCACHE;
1462 break;
1463 case Opt_local_lock:
1464 string = match_strdup(args);
1465 if (string == NULL)
1466 goto out_nomem;
1467 token = match_token(string, nfs_local_lock_tokens,
1468 args);
1469 kfree(string);
1470 switch (token) {
1471 case Opt_local_lock_all:
1472 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1473 NFS_MOUNT_LOCAL_FCNTL);
1474 break;
1475 case Opt_local_lock_flock:
1476 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1477 break;
1478 case Opt_local_lock_posix:
1479 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1480 break;
1481 case Opt_local_lock_none:
1482 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1483 NFS_MOUNT_LOCAL_FCNTL);
1484 break;
1485 default:
1486 dfprintk(MOUNT, "NFS: invalid "
1487 "local_lock argument\n");
1488 return 0;
1489 };
1490 break;
1491
1492 /*
1493 * Special options
1494 */
1495 case Opt_sloppy:
1496 sloppy = 1;
1497 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1498 break;
1499 case Opt_userspace:
1500 case Opt_deprecated:
1501 dfprintk(MOUNT, "NFS: ignoring mount option "
1502 "'%s'\n", p);
1503 break;
1504
1505 default:
1506 invalid_option = 1;
1507 dfprintk(MOUNT, "NFS: unrecognized mount option "
1508 "'%s'\n", p);
1509 }
1510 }
1511
1512 if (!sloppy && invalid_option)
1513 return 0;
1514
1515 /*
1516 * verify that any proto=/mountproto= options match the address
1517 * familiies in the addr=/mountaddr= options.
1518 */
1519 if (protofamily != AF_UNSPEC &&
1520 protofamily != mnt->nfs_server.address.ss_family)
1521 goto out_proto_mismatch;
1522
1523 if (mountfamily != AF_UNSPEC) {
1524 if (mnt->mount_server.addrlen) {
1525 if (mountfamily != mnt->mount_server.address.ss_family)
1526 goto out_mountproto_mismatch;
1527 } else {
1528 if (mountfamily != mnt->nfs_server.address.ss_family)
1529 goto out_mountproto_mismatch;
1530 }
1531 }
1532
1533 return 1;
1534
1535 out_mountproto_mismatch:
1536 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1537 "option\n");
1538 return 0;
1539 out_proto_mismatch:
1540 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1541 return 0;
1542 out_invalid_address:
1543 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1544 return 0;
1545 out_invalid_value:
1546 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1547 return 0;
1548 out_nomem:
1549 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1550 return 0;
1551 out_security_failure:
1552 free_secdata(secdata);
1553 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1554 return 0;
1555 }
1556
1557 /*
1558 * Match the requested auth flavors with the list returned by
1559 * the server. Returns zero and sets the mount's authentication
1560 * flavor on success; returns -EACCES if server does not support
1561 * the requested flavor.
1562 */
1563 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1564 struct nfs_mount_request *request)
1565 {
1566 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1567
1568 /*
1569 * Certain releases of Linux's mountd return an empty
1570 * flavor list. To prevent behavioral regression with
1571 * these servers (ie. rejecting mounts that used to
1572 * succeed), revert to pre-2.6.32 behavior (no checking)
1573 * if the returned flavor list is empty.
1574 */
1575 if (server_authlist_len == 0)
1576 return 0;
1577
1578 /*
1579 * We avoid sophisticated negotiating here, as there are
1580 * plenty of cases where we can get it wrong, providing
1581 * either too little or too much security.
1582 *
1583 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1584 * flavor listed first. However, some servers list
1585 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1586 * preferred default, in args->auth_flavors[0] if user
1587 * didn't specify sec= mount option.
1588 */
1589 for (i = 0; i < args->auth_flavor_len; i++)
1590 for (j = 0; j < server_authlist_len; j++)
1591 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1592 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1593 request->auth_flavs[j]);
1594 args->auth_flavors[0] = request->auth_flavs[j];
1595 return 0;
1596 }
1597
1598 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1599 nfs_umount(request);
1600 return -EACCES;
1601 }
1602
1603 /*
1604 * Use the remote server's MOUNT service to request the NFS file handle
1605 * corresponding to the provided path.
1606 */
1607 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1608 struct nfs_fh *root_fh)
1609 {
1610 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1611 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1612 struct nfs_mount_request request = {
1613 .sap = (struct sockaddr *)
1614 &args->mount_server.address,
1615 .dirpath = args->nfs_server.export_path,
1616 .protocol = args->mount_server.protocol,
1617 .fh = root_fh,
1618 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1619 .auth_flav_len = &server_authlist_len,
1620 .auth_flavs = server_authlist,
1621 };
1622 int status;
1623
1624 if (args->mount_server.version == 0) {
1625 switch (args->version) {
1626 default:
1627 args->mount_server.version = NFS_MNT3_VERSION;
1628 break;
1629 case 2:
1630 args->mount_server.version = NFS_MNT_VERSION;
1631 }
1632 }
1633 request.version = args->mount_server.version;
1634
1635 if (args->mount_server.hostname)
1636 request.hostname = args->mount_server.hostname;
1637 else
1638 request.hostname = args->nfs_server.hostname;
1639
1640 /*
1641 * Construct the mount server's address.
1642 */
1643 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1644 memcpy(request.sap, &args->nfs_server.address,
1645 args->nfs_server.addrlen);
1646 args->mount_server.addrlen = args->nfs_server.addrlen;
1647 }
1648 request.salen = args->mount_server.addrlen;
1649 nfs_set_port(request.sap, &args->mount_server.port, 0);
1650
1651 /*
1652 * Now ask the mount server to map our export path
1653 * to a file handle.
1654 */
1655 status = nfs_mount(&request);
1656 if (status != 0) {
1657 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1658 request.hostname, status);
1659 return status;
1660 }
1661
1662 /*
1663 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1664 */
1665 if (args->mount_server.version != NFS_MNT3_VERSION)
1666 return 0;
1667 return nfs_walk_authlist(args, &request);
1668 }
1669
1670 /*
1671 * Split "dev_name" into "hostname:export_path".
1672 *
1673 * The leftmost colon demarks the split between the server's hostname
1674 * and the export path. If the hostname starts with a left square
1675 * bracket, then it may contain colons.
1676 *
1677 * Note: caller frees hostname and export path, even on error.
1678 */
1679 static int nfs_parse_devname(const char *dev_name,
1680 char **hostname, size_t maxnamlen,
1681 char **export_path, size_t maxpathlen)
1682 {
1683 size_t len;
1684 char *end;
1685
1686 /* Is the host name protected with square brakcets? */
1687 if (*dev_name == '[') {
1688 end = strchr(++dev_name, ']');
1689 if (end == NULL || end[1] != ':')
1690 goto out_bad_devname;
1691
1692 len = end - dev_name;
1693 end++;
1694 } else {
1695 char *comma;
1696
1697 end = strchr(dev_name, ':');
1698 if (end == NULL)
1699 goto out_bad_devname;
1700 len = end - dev_name;
1701
1702 /* kill possible hostname list: not supported */
1703 comma = strchr(dev_name, ',');
1704 if (comma != NULL && comma < end)
1705 *comma = 0;
1706 }
1707
1708 if (len > maxnamlen)
1709 goto out_hostname;
1710
1711 /* N.B. caller will free nfs_server.hostname in all cases */
1712 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1713 if (*hostname == NULL)
1714 goto out_nomem;
1715 len = strlen(++end);
1716 if (len > maxpathlen)
1717 goto out_path;
1718 *export_path = kstrndup(end, len, GFP_KERNEL);
1719 if (!*export_path)
1720 goto out_nomem;
1721
1722 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1723 return 0;
1724
1725 out_bad_devname:
1726 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1727 return -EINVAL;
1728
1729 out_nomem:
1730 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1731 return -ENOMEM;
1732
1733 out_hostname:
1734 dfprintk(MOUNT, "NFS: server hostname too long\n");
1735 return -ENAMETOOLONG;
1736
1737 out_path:
1738 dfprintk(MOUNT, "NFS: export pathname too long\n");
1739 return -ENAMETOOLONG;
1740 }
1741
1742 /*
1743 * Validate the NFS2/NFS3 mount data
1744 * - fills in the mount root filehandle
1745 *
1746 * For option strings, user space handles the following behaviors:
1747 *
1748 * + DNS: mapping server host name to IP address ("addr=" option)
1749 *
1750 * + failure mode: how to behave if a mount request can't be handled
1751 * immediately ("fg/bg" option)
1752 *
1753 * + retry: how often to retry a mount request ("retry=" option)
1754 *
1755 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1756 * mountproto=tcp after mountproto=udp, and so on
1757 */
1758 static int nfs_validate_mount_data(void *options,
1759 struct nfs_parsed_mount_data *args,
1760 struct nfs_fh *mntfh,
1761 const char *dev_name)
1762 {
1763 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1764 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1765
1766 if (data == NULL)
1767 goto out_no_data;
1768
1769 switch (data->version) {
1770 case 1:
1771 data->namlen = 0;
1772 case 2:
1773 data->bsize = 0;
1774 case 3:
1775 if (data->flags & NFS_MOUNT_VER3)
1776 goto out_no_v3;
1777 data->root.size = NFS2_FHSIZE;
1778 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1779 case 4:
1780 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1781 goto out_no_sec;
1782 case 5:
1783 memset(data->context, 0, sizeof(data->context));
1784 case 6:
1785 if (data->flags & NFS_MOUNT_VER3) {
1786 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1787 goto out_invalid_fh;
1788 mntfh->size = data->root.size;
1789 args->version = 3;
1790 } else {
1791 mntfh->size = NFS2_FHSIZE;
1792 args->version = 2;
1793 }
1794
1795
1796 memcpy(mntfh->data, data->root.data, mntfh->size);
1797 if (mntfh->size < sizeof(mntfh->data))
1798 memset(mntfh->data + mntfh->size, 0,
1799 sizeof(mntfh->data) - mntfh->size);
1800
1801 /*
1802 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1803 * can deal with.
1804 */
1805 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1806 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1807 args->rsize = data->rsize;
1808 args->wsize = data->wsize;
1809 args->timeo = data->timeo;
1810 args->retrans = data->retrans;
1811 args->acregmin = data->acregmin;
1812 args->acregmax = data->acregmax;
1813 args->acdirmin = data->acdirmin;
1814 args->acdirmax = data->acdirmax;
1815
1816 memcpy(sap, &data->addr, sizeof(data->addr));
1817 args->nfs_server.addrlen = sizeof(data->addr);
1818 if (!nfs_verify_server_address(sap))
1819 goto out_no_address;
1820
1821 if (!(data->flags & NFS_MOUNT_TCP))
1822 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1823 /* N.B. caller will free nfs_server.hostname in all cases */
1824 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1825 args->namlen = data->namlen;
1826 args->bsize = data->bsize;
1827
1828 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1829 args->auth_flavors[0] = data->pseudoflavor;
1830 if (!args->nfs_server.hostname)
1831 goto out_nomem;
1832
1833 if (!(data->flags & NFS_MOUNT_NONLM))
1834 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1835 NFS_MOUNT_LOCAL_FCNTL);
1836 else
1837 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1838 NFS_MOUNT_LOCAL_FCNTL);
1839 /*
1840 * The legacy version 6 binary mount data from userspace has a
1841 * field used only to transport selinux information into the
1842 * the kernel. To continue to support that functionality we
1843 * have a touch of selinux knowledge here in the NFS code. The
1844 * userspace code converted context=blah to just blah so we are
1845 * converting back to the full string selinux understands.
1846 */
1847 if (data->context[0]){
1848 #ifdef CONFIG_SECURITY_SELINUX
1849 int rc;
1850 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1851 if (!opts_str)
1852 return -ENOMEM;
1853 strcpy(opts_str, "context=");
1854 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1855 strcat(opts_str, &data->context[0]);
1856 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1857 kfree(opts_str);
1858 if (rc)
1859 return rc;
1860 #else
1861 return -EINVAL;
1862 #endif
1863 }
1864
1865 break;
1866 default: {
1867 int status;
1868
1869 if (nfs_parse_mount_options((char *)options, args) == 0)
1870 return -EINVAL;
1871
1872 if (!nfs_verify_server_address(sap))
1873 goto out_no_address;
1874
1875 if (args->version == 4)
1876 #ifdef CONFIG_NFS_V4
1877 return nfs4_validate_text_mount_data(options,
1878 args, dev_name);
1879 #else
1880 goto out_v4_not_compiled;
1881 #endif
1882
1883 nfs_set_port(sap, &args->nfs_server.port, 0);
1884
1885 nfs_set_mount_transport_protocol(args);
1886
1887 status = nfs_parse_devname(dev_name,
1888 &args->nfs_server.hostname,
1889 PAGE_SIZE,
1890 &args->nfs_server.export_path,
1891 NFS_MAXPATHLEN);
1892 if (!status)
1893 status = nfs_try_mount(args, mntfh);
1894
1895 kfree(args->nfs_server.export_path);
1896 args->nfs_server.export_path = NULL;
1897
1898 if (status)
1899 return status;
1900
1901 break;
1902 }
1903 }
1904
1905 #ifndef CONFIG_NFS_V3
1906 if (args->version == 3)
1907 goto out_v3_not_compiled;
1908 #endif /* !CONFIG_NFS_V3 */
1909
1910 return 0;
1911
1912 out_no_data:
1913 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1914 return -EINVAL;
1915
1916 out_no_v3:
1917 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1918 data->version);
1919 return -EINVAL;
1920
1921 out_no_sec:
1922 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1923 return -EINVAL;
1924
1925 #ifndef CONFIG_NFS_V3
1926 out_v3_not_compiled:
1927 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1928 return -EPROTONOSUPPORT;
1929 #endif /* !CONFIG_NFS_V3 */
1930
1931 #ifndef CONFIG_NFS_V4
1932 out_v4_not_compiled:
1933 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1934 return -EPROTONOSUPPORT;
1935 #endif /* !CONFIG_NFS_V4 */
1936
1937 out_nomem:
1938 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1939 return -ENOMEM;
1940
1941 out_no_address:
1942 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1943 return -EINVAL;
1944
1945 out_invalid_fh:
1946 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1947 return -EINVAL;
1948 }
1949
1950 static int
1951 nfs_compare_remount_data(struct nfs_server *nfss,
1952 struct nfs_parsed_mount_data *data)
1953 {
1954 if (data->flags != nfss->flags ||
1955 data->rsize != nfss->rsize ||
1956 data->wsize != nfss->wsize ||
1957 data->retrans != nfss->client->cl_timeout->to_retries ||
1958 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1959 data->acregmin != nfss->acregmin / HZ ||
1960 data->acregmax != nfss->acregmax / HZ ||
1961 data->acdirmin != nfss->acdirmin / HZ ||
1962 data->acdirmax != nfss->acdirmax / HZ ||
1963 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1964 data->nfs_server.port != nfss->port ||
1965 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1966 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1967 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1968 return -EINVAL;
1969
1970 return 0;
1971 }
1972
1973 static int
1974 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1975 {
1976 int error;
1977 struct nfs_server *nfss = sb->s_fs_info;
1978 struct nfs_parsed_mount_data *data;
1979 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1980 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1981 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1982
1983 /*
1984 * Userspace mount programs that send binary options generally send
1985 * them populated with default values. We have no way to know which
1986 * ones were explicitly specified. Fall back to legacy behavior and
1987 * just return success.
1988 */
1989 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1990 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1991 options->version <= 6))))
1992 return 0;
1993
1994 data = kzalloc(sizeof(*data), GFP_KERNEL);
1995 if (data == NULL)
1996 return -ENOMEM;
1997
1998 /* fill out struct with values from existing mount */
1999 data->flags = nfss->flags;
2000 data->rsize = nfss->rsize;
2001 data->wsize = nfss->wsize;
2002 data->retrans = nfss->client->cl_timeout->to_retries;
2003 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2004 data->acregmin = nfss->acregmin / HZ;
2005 data->acregmax = nfss->acregmax / HZ;
2006 data->acdirmin = nfss->acdirmin / HZ;
2007 data->acdirmax = nfss->acdirmax / HZ;
2008 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2009 data->nfs_server.port = nfss->port;
2010 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2011 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2012 data->nfs_server.addrlen);
2013
2014 /* overwrite those values with any that were specified */
2015 error = nfs_parse_mount_options((char *)options, data);
2016 if (error < 0)
2017 goto out;
2018
2019 /*
2020 * noac is a special case. It implies -o sync, but that's not
2021 * necessarily reflected in the mtab options. do_remount_sb
2022 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2023 * remount options, so we have to explicitly reset it.
2024 */
2025 if (data->flags & NFS_MOUNT_NOAC)
2026 *flags |= MS_SYNCHRONOUS;
2027
2028 /* compare new mount options with old ones */
2029 error = nfs_compare_remount_data(nfss, data);
2030 out:
2031 kfree(data);
2032 return error;
2033 }
2034
2035 /*
2036 * Initialise the common bits of the superblock
2037 */
2038 static inline void nfs_initialise_sb(struct super_block *sb)
2039 {
2040 struct nfs_server *server = NFS_SB(sb);
2041
2042 sb->s_magic = NFS_SUPER_MAGIC;
2043
2044 /* We probably want something more informative here */
2045 snprintf(sb->s_id, sizeof(sb->s_id),
2046 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2047
2048 if (sb->s_blocksize == 0)
2049 sb->s_blocksize = nfs_block_bits(server->wsize,
2050 &sb->s_blocksize_bits);
2051
2052 if (server->flags & NFS_MOUNT_NOAC)
2053 sb->s_flags |= MS_SYNCHRONOUS;
2054
2055 sb->s_bdi = &server->backing_dev_info;
2056
2057 nfs_super_set_maxbytes(sb, server->maxfilesize);
2058 }
2059
2060 /*
2061 * Finish setting up an NFS2/3 superblock
2062 */
2063 static void nfs_fill_super(struct super_block *sb,
2064 struct nfs_parsed_mount_data *data)
2065 {
2066 struct nfs_server *server = NFS_SB(sb);
2067
2068 sb->s_blocksize_bits = 0;
2069 sb->s_blocksize = 0;
2070 if (data->bsize)
2071 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2072
2073 if (server->nfs_client->rpc_ops->version == 3) {
2074 /* The VFS shouldn't apply the umask to mode bits. We will do
2075 * so ourselves when necessary.
2076 */
2077 sb->s_flags |= MS_POSIXACL;
2078 sb->s_time_gran = 1;
2079 }
2080
2081 sb->s_op = &nfs_sops;
2082 nfs_initialise_sb(sb);
2083 }
2084
2085 /*
2086 * Finish setting up a cloned NFS2/3 superblock
2087 */
2088 static void nfs_clone_super(struct super_block *sb,
2089 const struct super_block *old_sb)
2090 {
2091 struct nfs_server *server = NFS_SB(sb);
2092
2093 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2094 sb->s_blocksize = old_sb->s_blocksize;
2095 sb->s_maxbytes = old_sb->s_maxbytes;
2096
2097 if (server->nfs_client->rpc_ops->version == 3) {
2098 /* The VFS shouldn't apply the umask to mode bits. We will do
2099 * so ourselves when necessary.
2100 */
2101 sb->s_flags |= MS_POSIXACL;
2102 sb->s_time_gran = 1;
2103 }
2104
2105 sb->s_op = old_sb->s_op;
2106 nfs_initialise_sb(sb);
2107 }
2108
2109 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2110 {
2111 const struct nfs_server *a = s->s_fs_info;
2112 const struct rpc_clnt *clnt_a = a->client;
2113 const struct rpc_clnt *clnt_b = b->client;
2114
2115 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2116 goto Ebusy;
2117 if (a->nfs_client != b->nfs_client)
2118 goto Ebusy;
2119 if (a->flags != b->flags)
2120 goto Ebusy;
2121 if (a->wsize != b->wsize)
2122 goto Ebusy;
2123 if (a->rsize != b->rsize)
2124 goto Ebusy;
2125 if (a->acregmin != b->acregmin)
2126 goto Ebusy;
2127 if (a->acregmax != b->acregmax)
2128 goto Ebusy;
2129 if (a->acdirmin != b->acdirmin)
2130 goto Ebusy;
2131 if (a->acdirmax != b->acdirmax)
2132 goto Ebusy;
2133 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2134 goto Ebusy;
2135 return 1;
2136 Ebusy:
2137 return 0;
2138 }
2139
2140 struct nfs_sb_mountdata {
2141 struct nfs_server *server;
2142 int mntflags;
2143 };
2144
2145 static int nfs_set_super(struct super_block *s, void *data)
2146 {
2147 struct nfs_sb_mountdata *sb_mntdata = data;
2148 struct nfs_server *server = sb_mntdata->server;
2149 int ret;
2150
2151 s->s_flags = sb_mntdata->mntflags;
2152 s->s_fs_info = server;
2153 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2154 ret = set_anon_super(s, server);
2155 if (ret == 0)
2156 server->s_dev = s->s_dev;
2157 return ret;
2158 }
2159
2160 static int nfs_compare_super_address(struct nfs_server *server1,
2161 struct nfs_server *server2)
2162 {
2163 struct sockaddr *sap1, *sap2;
2164
2165 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2166 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2167
2168 if (sap1->sa_family != sap2->sa_family)
2169 return 0;
2170
2171 switch (sap1->sa_family) {
2172 case AF_INET: {
2173 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2174 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2175 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2176 return 0;
2177 if (sin1->sin_port != sin2->sin_port)
2178 return 0;
2179 break;
2180 }
2181 case AF_INET6: {
2182 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2183 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2184 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2185 return 0;
2186 if (sin1->sin6_port != sin2->sin6_port)
2187 return 0;
2188 break;
2189 }
2190 default:
2191 return 0;
2192 }
2193
2194 return 1;
2195 }
2196
2197 static int nfs_compare_super(struct super_block *sb, void *data)
2198 {
2199 struct nfs_sb_mountdata *sb_mntdata = data;
2200 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2201 int mntflags = sb_mntdata->mntflags;
2202
2203 if (!nfs_compare_super_address(old, server))
2204 return 0;
2205 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2206 if (old->flags & NFS_MOUNT_UNSHARED)
2207 return 0;
2208 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2209 return 0;
2210 return nfs_compare_mount_options(sb, server, mntflags);
2211 }
2212
2213 static int nfs_bdi_register(struct nfs_server *server)
2214 {
2215 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2216 }
2217
2218 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2219 int flags, const char *dev_name, void *raw_data)
2220 {
2221 struct nfs_server *server = NULL;
2222 struct super_block *s;
2223 struct nfs_parsed_mount_data *data;
2224 struct nfs_fh *mntfh;
2225 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2226 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2227 struct nfs_sb_mountdata sb_mntdata = {
2228 .mntflags = flags,
2229 };
2230 int error;
2231
2232 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2233 mntfh = nfs_alloc_fhandle();
2234 if (data == NULL || mntfh == NULL)
2235 goto out;
2236
2237 /* Validate the mount data */
2238 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2239 if (error < 0) {
2240 mntroot = ERR_PTR(error);
2241 goto out;
2242 }
2243
2244 #ifdef CONFIG_NFS_V4
2245 if (data->version == 4) {
2246 mntroot = nfs4_try_mount(flags, dev_name, data);
2247 goto out;
2248 }
2249 #endif /* CONFIG_NFS_V4 */
2250
2251 /* Get a volume representation */
2252 server = nfs_create_server(data, mntfh);
2253 if (IS_ERR(server)) {
2254 mntroot = ERR_CAST(server);
2255 goto out;
2256 }
2257 sb_mntdata.server = server;
2258
2259 if (server->flags & NFS_MOUNT_UNSHARED)
2260 compare_super = NULL;
2261
2262 /* Get a superblock - note that we may end up sharing one that already exists */
2263 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2264 if (IS_ERR(s)) {
2265 mntroot = ERR_CAST(s);
2266 goto out_err_nosb;
2267 }
2268
2269 if (s->s_fs_info != server) {
2270 nfs_free_server(server);
2271 server = NULL;
2272 } else {
2273 error = nfs_bdi_register(server);
2274 if (error) {
2275 mntroot = ERR_PTR(error);
2276 goto error_splat_bdi;
2277 }
2278 }
2279
2280 if (!s->s_root) {
2281 /* initial superblock/root creation */
2282 nfs_fill_super(s, data);
2283 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2284 }
2285
2286 mntroot = nfs_get_root(s, mntfh, dev_name);
2287 if (IS_ERR(mntroot))
2288 goto error_splat_super;
2289
2290 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2291 if (error)
2292 goto error_splat_root;
2293
2294 s->s_flags |= MS_ACTIVE;
2295
2296 out:
2297 nfs_free_parsed_mount_data(data);
2298 nfs_free_fhandle(mntfh);
2299 return mntroot;
2300
2301 out_err_nosb:
2302 nfs_free_server(server);
2303 goto out;
2304
2305 error_splat_root:
2306 dput(mntroot);
2307 mntroot = ERR_PTR(error);
2308 error_splat_super:
2309 if (server && !s->s_root)
2310 bdi_unregister(&server->backing_dev_info);
2311 error_splat_bdi:
2312 deactivate_locked_super(s);
2313 goto out;
2314 }
2315
2316 /*
2317 * Ensure that we unregister the bdi before kill_anon_super
2318 * releases the device name
2319 */
2320 static void nfs_put_super(struct super_block *s)
2321 {
2322 struct nfs_server *server = NFS_SB(s);
2323
2324 bdi_unregister(&server->backing_dev_info);
2325 }
2326
2327 /*
2328 * Destroy an NFS2/3 superblock
2329 */
2330 static void nfs_kill_super(struct super_block *s)
2331 {
2332 struct nfs_server *server = NFS_SB(s);
2333
2334 kill_anon_super(s);
2335 nfs_fscache_release_super_cookie(s);
2336 nfs_free_server(server);
2337 }
2338
2339 /*
2340 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2341 */
2342 static struct dentry *
2343 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2344 const char *dev_name, void *raw_data)
2345 {
2346 struct nfs_clone_mount *data = raw_data;
2347 struct super_block *s;
2348 struct nfs_server *server;
2349 struct dentry *mntroot;
2350 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2351 struct nfs_sb_mountdata sb_mntdata = {
2352 .mntflags = flags,
2353 };
2354 int error;
2355
2356 dprintk("--> nfs_xdev_mount()\n");
2357
2358 /* create a new volume representation */
2359 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2360 if (IS_ERR(server)) {
2361 error = PTR_ERR(server);
2362 goto out_err_noserver;
2363 }
2364 sb_mntdata.server = server;
2365
2366 if (server->flags & NFS_MOUNT_UNSHARED)
2367 compare_super = NULL;
2368
2369 /* Get a superblock - note that we may end up sharing one that already exists */
2370 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2371 if (IS_ERR(s)) {
2372 error = PTR_ERR(s);
2373 goto out_err_nosb;
2374 }
2375
2376 if (s->s_fs_info != server) {
2377 nfs_free_server(server);
2378 server = NULL;
2379 } else {
2380 error = nfs_bdi_register(server);
2381 if (error)
2382 goto error_splat_bdi;
2383 }
2384
2385 if (!s->s_root) {
2386 /* initial superblock/root creation */
2387 nfs_clone_super(s, data->sb);
2388 nfs_fscache_get_super_cookie(s, NULL, data);
2389 }
2390
2391 mntroot = nfs_get_root(s, data->fh, dev_name);
2392 if (IS_ERR(mntroot)) {
2393 error = PTR_ERR(mntroot);
2394 goto error_splat_super;
2395 }
2396 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2397 dput(mntroot);
2398 error = -ESTALE;
2399 goto error_splat_super;
2400 }
2401
2402 s->s_flags |= MS_ACTIVE;
2403
2404 /* clone any lsm security options from the parent to the new sb */
2405 security_sb_clone_mnt_opts(data->sb, s);
2406
2407 dprintk("<-- nfs_xdev_mount() = 0\n");
2408 return mntroot;
2409
2410 out_err_nosb:
2411 nfs_free_server(server);
2412 out_err_noserver:
2413 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2414 return ERR_PTR(error);
2415
2416 error_splat_super:
2417 if (server && !s->s_root)
2418 bdi_unregister(&server->backing_dev_info);
2419 error_splat_bdi:
2420 deactivate_locked_super(s);
2421 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2422 return ERR_PTR(error);
2423 }
2424
2425 #ifdef CONFIG_NFS_V4
2426
2427 /*
2428 * Finish setting up a cloned NFS4 superblock
2429 */
2430 static void nfs4_clone_super(struct super_block *sb,
2431 const struct super_block *old_sb)
2432 {
2433 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2434 sb->s_blocksize = old_sb->s_blocksize;
2435 sb->s_maxbytes = old_sb->s_maxbytes;
2436 sb->s_time_gran = 1;
2437 sb->s_op = old_sb->s_op;
2438 /*
2439 * The VFS shouldn't apply the umask to mode bits. We will do
2440 * so ourselves when necessary.
2441 */
2442 sb->s_flags |= MS_POSIXACL;
2443 sb->s_xattr = old_sb->s_xattr;
2444 nfs_initialise_sb(sb);
2445 }
2446
2447 /*
2448 * Set up an NFS4 superblock
2449 */
2450 static void nfs4_fill_super(struct super_block *sb)
2451 {
2452 sb->s_time_gran = 1;
2453 sb->s_op = &nfs4_sops;
2454 /*
2455 * The VFS shouldn't apply the umask to mode bits. We will do
2456 * so ourselves when necessary.
2457 */
2458 sb->s_flags |= MS_POSIXACL;
2459 sb->s_xattr = nfs4_xattr_handlers;
2460 nfs_initialise_sb(sb);
2461 }
2462
2463 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2464 {
2465 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2466 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2467 }
2468
2469 static int nfs4_validate_text_mount_data(void *options,
2470 struct nfs_parsed_mount_data *args,
2471 const char *dev_name)
2472 {
2473 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2474
2475 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2476
2477 nfs_validate_transport_protocol(args);
2478
2479 nfs4_validate_mount_flags(args);
2480
2481 if (args->version != 4) {
2482 dfprintk(MOUNT,
2483 "NFS4: Illegal mount version\n");
2484 return -EINVAL;
2485 }
2486
2487 if (args->auth_flavor_len > 1) {
2488 dfprintk(MOUNT,
2489 "NFS4: Too many RPC auth flavours specified\n");
2490 return -EINVAL;
2491 }
2492
2493 if (args->client_address == NULL) {
2494 dfprintk(MOUNT,
2495 "NFS4: mount program didn't pass callback address\n");
2496 return -EINVAL;
2497 }
2498
2499 return nfs_parse_devname(dev_name,
2500 &args->nfs_server.hostname,
2501 NFS4_MAXNAMLEN,
2502 &args->nfs_server.export_path,
2503 NFS4_MAXPATHLEN);
2504 }
2505
2506 /*
2507 * Validate NFSv4 mount options
2508 */
2509 static int nfs4_validate_mount_data(void *options,
2510 struct nfs_parsed_mount_data *args,
2511 const char *dev_name)
2512 {
2513 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2514 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2515 char *c;
2516
2517 if (data == NULL)
2518 goto out_no_data;
2519
2520 switch (data->version) {
2521 case 1:
2522 if (data->host_addrlen > sizeof(args->nfs_server.address))
2523 goto out_no_address;
2524 if (data->host_addrlen == 0)
2525 goto out_no_address;
2526 args->nfs_server.addrlen = data->host_addrlen;
2527 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2528 return -EFAULT;
2529 if (!nfs_verify_server_address(sap))
2530 goto out_no_address;
2531
2532 if (data->auth_flavourlen) {
2533 if (data->auth_flavourlen > 1)
2534 goto out_inval_auth;
2535 if (copy_from_user(&args->auth_flavors[0],
2536 data->auth_flavours,
2537 sizeof(args->auth_flavors[0])))
2538 return -EFAULT;
2539 }
2540
2541 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2542 if (IS_ERR(c))
2543 return PTR_ERR(c);
2544 args->nfs_server.hostname = c;
2545
2546 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2547 if (IS_ERR(c))
2548 return PTR_ERR(c);
2549 args->nfs_server.export_path = c;
2550 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2551
2552 c = strndup_user(data->client_addr.data, 16);
2553 if (IS_ERR(c))
2554 return PTR_ERR(c);
2555 args->client_address = c;
2556
2557 /*
2558 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2559 * can deal with.
2560 */
2561
2562 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2563 args->rsize = data->rsize;
2564 args->wsize = data->wsize;
2565 args->timeo = data->timeo;
2566 args->retrans = data->retrans;
2567 args->acregmin = data->acregmin;
2568 args->acregmax = data->acregmax;
2569 args->acdirmin = data->acdirmin;
2570 args->acdirmax = data->acdirmax;
2571 args->nfs_server.protocol = data->proto;
2572 nfs_validate_transport_protocol(args);
2573
2574 break;
2575 default:
2576 if (nfs_parse_mount_options((char *)options, args) == 0)
2577 return -EINVAL;
2578
2579 if (!nfs_verify_server_address(sap))
2580 return -EINVAL;
2581
2582 return nfs4_validate_text_mount_data(options, args, dev_name);
2583 }
2584
2585 return 0;
2586
2587 out_no_data:
2588 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2589 return -EINVAL;
2590
2591 out_inval_auth:
2592 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2593 data->auth_flavourlen);
2594 return -EINVAL;
2595
2596 out_no_address:
2597 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2598 return -EINVAL;
2599 }
2600
2601 /*
2602 * Get the superblock for the NFS4 root partition
2603 */
2604 static struct dentry *
2605 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2606 const char *dev_name, void *raw_data)
2607 {
2608 struct nfs_parsed_mount_data *data = raw_data;
2609 struct super_block *s;
2610 struct nfs_server *server;
2611 struct nfs_fh *mntfh;
2612 struct dentry *mntroot;
2613 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2614 struct nfs_sb_mountdata sb_mntdata = {
2615 .mntflags = flags,
2616 };
2617 int error = -ENOMEM;
2618
2619 mntfh = nfs_alloc_fhandle();
2620 if (data == NULL || mntfh == NULL)
2621 goto out;
2622
2623 /* Get a volume representation */
2624 server = nfs4_create_server(data, mntfh);
2625 if (IS_ERR(server)) {
2626 error = PTR_ERR(server);
2627 goto out;
2628 }
2629 sb_mntdata.server = server;
2630
2631 if (server->flags & NFS4_MOUNT_UNSHARED)
2632 compare_super = NULL;
2633
2634 /* Get a superblock - note that we may end up sharing one that already exists */
2635 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2636 if (IS_ERR(s)) {
2637 error = PTR_ERR(s);
2638 goto out_free;
2639 }
2640
2641 if (s->s_fs_info != server) {
2642 nfs_free_server(server);
2643 server = NULL;
2644 } else {
2645 error = nfs_bdi_register(server);
2646 if (error)
2647 goto error_splat_bdi;
2648 }
2649
2650 if (!s->s_root) {
2651 /* initial superblock/root creation */
2652 nfs4_fill_super(s);
2653 nfs_fscache_get_super_cookie(
2654 s, data ? data->fscache_uniq : NULL, NULL);
2655 }
2656
2657 mntroot = nfs4_get_root(s, mntfh, dev_name);
2658 if (IS_ERR(mntroot)) {
2659 error = PTR_ERR(mntroot);
2660 goto error_splat_super;
2661 }
2662
2663 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2664 if (error)
2665 goto error_splat_root;
2666
2667 s->s_flags |= MS_ACTIVE;
2668
2669 nfs_free_fhandle(mntfh);
2670 return mntroot;
2671
2672 out:
2673 nfs_free_fhandle(mntfh);
2674 return ERR_PTR(error);
2675
2676 out_free:
2677 nfs_free_server(server);
2678 goto out;
2679
2680 error_splat_root:
2681 dput(mntroot);
2682 error_splat_super:
2683 if (server && !s->s_root)
2684 bdi_unregister(&server->backing_dev_info);
2685 error_splat_bdi:
2686 deactivate_locked_super(s);
2687 goto out;
2688 }
2689
2690 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2691 int flags, void *data, const char *hostname)
2692 {
2693 struct vfsmount *root_mnt;
2694 char *root_devname;
2695 size_t len;
2696
2697 len = strlen(hostname) + 5;
2698 root_devname = kmalloc(len, GFP_KERNEL);
2699 if (root_devname == NULL)
2700 return ERR_PTR(-ENOMEM);
2701 /* Does hostname needs to be enclosed in brackets? */
2702 if (strchr(hostname, ':'))
2703 snprintf(root_devname, len, "[%s]:/", hostname);
2704 else
2705 snprintf(root_devname, len, "%s:/", hostname);
2706 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2707 kfree(root_devname);
2708 return root_mnt;
2709 }
2710
2711 struct nfs_referral_count {
2712 struct list_head list;
2713 const struct task_struct *task;
2714 unsigned int referral_count;
2715 };
2716
2717 static LIST_HEAD(nfs_referral_count_list);
2718 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2719
2720 static struct nfs_referral_count *nfs_find_referral_count(void)
2721 {
2722 struct nfs_referral_count *p;
2723
2724 list_for_each_entry(p, &nfs_referral_count_list, list) {
2725 if (p->task == current)
2726 return p;
2727 }
2728 return NULL;
2729 }
2730
2731 #define NFS_MAX_NESTED_REFERRALS 2
2732
2733 static int nfs_referral_loop_protect(void)
2734 {
2735 struct nfs_referral_count *p, *new;
2736 int ret = -ENOMEM;
2737
2738 new = kmalloc(sizeof(*new), GFP_KERNEL);
2739 if (!new)
2740 goto out;
2741 new->task = current;
2742 new->referral_count = 1;
2743
2744 ret = 0;
2745 spin_lock(&nfs_referral_count_list_lock);
2746 p = nfs_find_referral_count();
2747 if (p != NULL) {
2748 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2749 ret = -ELOOP;
2750 else
2751 p->referral_count++;
2752 } else {
2753 list_add(&new->list, &nfs_referral_count_list);
2754 new = NULL;
2755 }
2756 spin_unlock(&nfs_referral_count_list_lock);
2757 kfree(new);
2758 out:
2759 return ret;
2760 }
2761
2762 static void nfs_referral_loop_unprotect(void)
2763 {
2764 struct nfs_referral_count *p;
2765
2766 spin_lock(&nfs_referral_count_list_lock);
2767 p = nfs_find_referral_count();
2768 p->referral_count--;
2769 if (p->referral_count == 0)
2770 list_del(&p->list);
2771 else
2772 p = NULL;
2773 spin_unlock(&nfs_referral_count_list_lock);
2774 kfree(p);
2775 }
2776
2777 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2778 const char *export_path)
2779 {
2780 struct nameidata *nd = NULL;
2781 struct mnt_namespace *ns_private;
2782 struct super_block *s;
2783 struct dentry *dentry;
2784 int ret;
2785
2786 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2787 if (nd == NULL)
2788 return ERR_PTR(-ENOMEM);
2789
2790 ns_private = create_mnt_ns(root_mnt);
2791 ret = PTR_ERR(ns_private);
2792 if (IS_ERR(ns_private))
2793 goto out_mntput;
2794
2795 ret = nfs_referral_loop_protect();
2796 if (ret != 0)
2797 goto out_put_mnt_ns;
2798
2799 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2800 export_path, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, nd);
2801
2802 nfs_referral_loop_unprotect();
2803 put_mnt_ns(ns_private);
2804
2805 if (ret != 0)
2806 goto out_err;
2807
2808 s = nd->path.mnt->mnt_sb;
2809 atomic_inc(&s->s_active);
2810 dentry = dget(nd->path.dentry);
2811
2812 path_put(&nd->path);
2813 kfree(nd);
2814 down_write(&s->s_umount);
2815 return dentry;
2816 out_put_mnt_ns:
2817 put_mnt_ns(ns_private);
2818 out_mntput:
2819 mntput(root_mnt);
2820 out_err:
2821 kfree(nd);
2822 return ERR_PTR(ret);
2823 }
2824
2825 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2826 struct nfs_parsed_mount_data *data)
2827 {
2828 char *export_path;
2829 struct vfsmount *root_mnt;
2830 struct dentry *res;
2831
2832 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2833
2834 export_path = data->nfs_server.export_path;
2835 data->nfs_server.export_path = "/";
2836 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2837 data->nfs_server.hostname);
2838 data->nfs_server.export_path = export_path;
2839
2840 res = ERR_CAST(root_mnt);
2841 if (!IS_ERR(root_mnt))
2842 res = nfs_follow_remote_path(root_mnt, export_path);
2843
2844 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2845 IS_ERR(res) ? PTR_ERR(res) : 0,
2846 IS_ERR(res) ? " [error]" : "");
2847 return res;
2848 }
2849
2850 /*
2851 * Get the superblock for an NFS4 mountpoint
2852 */
2853 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2854 int flags, const char *dev_name, void *raw_data)
2855 {
2856 struct nfs_parsed_mount_data *data;
2857 int error = -ENOMEM;
2858 struct dentry *res = ERR_PTR(-ENOMEM);
2859
2860 data = nfs_alloc_parsed_mount_data(4);
2861 if (data == NULL)
2862 goto out;
2863
2864 /* Validate the mount data */
2865 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2866 if (error < 0) {
2867 res = ERR_PTR(error);
2868 goto out;
2869 }
2870
2871 res = nfs4_try_mount(flags, dev_name, data);
2872 if (IS_ERR(res))
2873 error = PTR_ERR(res);
2874
2875 out:
2876 nfs_free_parsed_mount_data(data);
2877 dprintk("<-- nfs4_mount() = %d%s\n", error,
2878 error != 0 ? " [error]" : "");
2879 return res;
2880 }
2881
2882 static void nfs4_kill_super(struct super_block *sb)
2883 {
2884 struct nfs_server *server = NFS_SB(sb);
2885
2886 dprintk("--> %s\n", __func__);
2887 nfs_super_return_all_delegations(sb);
2888 kill_anon_super(sb);
2889 nfs_fscache_release_super_cookie(sb);
2890 nfs_free_server(server);
2891 dprintk("<-- %s\n", __func__);
2892 }
2893
2894 /*
2895 * Clone an NFS4 server record on xdev traversal (FSID-change)
2896 */
2897 static struct dentry *
2898 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2899 const char *dev_name, void *raw_data)
2900 {
2901 struct nfs_clone_mount *data = raw_data;
2902 struct super_block *s;
2903 struct nfs_server *server;
2904 struct dentry *mntroot;
2905 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2906 struct nfs_sb_mountdata sb_mntdata = {
2907 .mntflags = flags,
2908 };
2909 int error;
2910
2911 dprintk("--> nfs4_xdev_mount()\n");
2912
2913 /* create a new volume representation */
2914 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2915 if (IS_ERR(server)) {
2916 error = PTR_ERR(server);
2917 goto out_err_noserver;
2918 }
2919 sb_mntdata.server = server;
2920
2921 if (server->flags & NFS4_MOUNT_UNSHARED)
2922 compare_super = NULL;
2923
2924 /* Get a superblock - note that we may end up sharing one that already exists */
2925 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2926 if (IS_ERR(s)) {
2927 error = PTR_ERR(s);
2928 goto out_err_nosb;
2929 }
2930
2931 if (s->s_fs_info != server) {
2932 nfs_free_server(server);
2933 server = NULL;
2934 } else {
2935 error = nfs_bdi_register(server);
2936 if (error)
2937 goto error_splat_bdi;
2938 }
2939
2940 if (!s->s_root) {
2941 /* initial superblock/root creation */
2942 nfs4_clone_super(s, data->sb);
2943 nfs_fscache_get_super_cookie(s, NULL, data);
2944 }
2945
2946 mntroot = nfs4_get_root(s, data->fh, dev_name);
2947 if (IS_ERR(mntroot)) {
2948 error = PTR_ERR(mntroot);
2949 goto error_splat_super;
2950 }
2951 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2952 dput(mntroot);
2953 error = -ESTALE;
2954 goto error_splat_super;
2955 }
2956
2957 s->s_flags |= MS_ACTIVE;
2958
2959 security_sb_clone_mnt_opts(data->sb, s);
2960
2961 dprintk("<-- nfs4_xdev_mount() = 0\n");
2962 return mntroot;
2963
2964 out_err_nosb:
2965 nfs_free_server(server);
2966 out_err_noserver:
2967 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2968 return ERR_PTR(error);
2969
2970 error_splat_super:
2971 if (server && !s->s_root)
2972 bdi_unregister(&server->backing_dev_info);
2973 error_splat_bdi:
2974 deactivate_locked_super(s);
2975 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2976 return ERR_PTR(error);
2977 }
2978
2979 static struct dentry *
2980 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2981 const char *dev_name, void *raw_data)
2982 {
2983 struct nfs_clone_mount *data = raw_data;
2984 struct super_block *s;
2985 struct nfs_server *server;
2986 struct dentry *mntroot;
2987 struct nfs_fh *mntfh;
2988 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2989 struct nfs_sb_mountdata sb_mntdata = {
2990 .mntflags = flags,
2991 };
2992 int error = -ENOMEM;
2993
2994 dprintk("--> nfs4_referral_get_sb()\n");
2995
2996 mntfh = nfs_alloc_fhandle();
2997 if (mntfh == NULL)
2998 goto out_err_nofh;
2999
3000 /* create a new volume representation */
3001 server = nfs4_create_referral_server(data, mntfh);
3002 if (IS_ERR(server)) {
3003 error = PTR_ERR(server);
3004 goto out_err_noserver;
3005 }
3006 sb_mntdata.server = server;
3007
3008 if (server->flags & NFS4_MOUNT_UNSHARED)
3009 compare_super = NULL;
3010
3011 /* Get a superblock - note that we may end up sharing one that already exists */
3012 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3013 if (IS_ERR(s)) {
3014 error = PTR_ERR(s);
3015 goto out_err_nosb;
3016 }
3017
3018 if (s->s_fs_info != server) {
3019 nfs_free_server(server);
3020 server = NULL;
3021 } else {
3022 error = nfs_bdi_register(server);
3023 if (error)
3024 goto error_splat_bdi;
3025 }
3026
3027 if (!s->s_root) {
3028 /* initial superblock/root creation */
3029 nfs4_fill_super(s);
3030 nfs_fscache_get_super_cookie(s, NULL, data);
3031 }
3032
3033 mntroot = nfs4_get_root(s, mntfh, dev_name);
3034 if (IS_ERR(mntroot)) {
3035 error = PTR_ERR(mntroot);
3036 goto error_splat_super;
3037 }
3038 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3039 dput(mntroot);
3040 error = -ESTALE;
3041 goto error_splat_super;
3042 }
3043
3044 s->s_flags |= MS_ACTIVE;
3045
3046 security_sb_clone_mnt_opts(data->sb, s);
3047
3048 nfs_free_fhandle(mntfh);
3049 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3050 return mntroot;
3051
3052 out_err_nosb:
3053 nfs_free_server(server);
3054 out_err_noserver:
3055 nfs_free_fhandle(mntfh);
3056 out_err_nofh:
3057 dprintk("<-- nfs4_referral_get_sb() = %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 nfs_free_fhandle(mntfh);
3066 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3067 return ERR_PTR(error);
3068 }
3069
3070 /*
3071 * Create an NFS4 server record on referral traversal
3072 */
3073 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3074 int flags, const char *dev_name, void *raw_data)
3075 {
3076 struct nfs_clone_mount *data = raw_data;
3077 char *export_path;
3078 struct vfsmount *root_mnt;
3079 struct dentry *res;
3080
3081 dprintk("--> nfs4_referral_mount()\n");
3082
3083 export_path = data->mnt_path;
3084 data->mnt_path = "/";
3085
3086 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3087 flags, data, data->hostname);
3088 data->mnt_path = export_path;
3089
3090 res = ERR_CAST(root_mnt);
3091 if (!IS_ERR(root_mnt))
3092 res = nfs_follow_remote_path(root_mnt, export_path);
3093 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3094 IS_ERR(res) ? PTR_ERR(res) : 0,
3095 IS_ERR(res) ? " [error]" : "");
3096 return res;
3097 }
3098
3099 #endif /* CONFIG_NFS_V4 */