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Merge branch 'next/deletion' of git://git.linaro.org/people/arnd/arm-soc
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/mnt_namespace.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 #ifdef CONFIG_NFS_V3
71 #define NFS_DEFAULT_VERSION 3
72 #else
73 #define NFS_DEFAULT_VERSION 2
74 #endif
75
76 enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
83 Opt_v2, Opt_v3, Opt_v4,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_nfsvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115 };
116
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
138 { Opt_v4, "v4" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152
153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
176 { Opt_mounthost, "mounthost=%s" },
177 { Opt_mountaddr, "mountaddr=%s" },
178
179 { Opt_lookupcache, "lookupcache=%s" },
180 { Opt_fscache_uniq, "fsc=%s" },
181 { Opt_local_lock, "local_lock=%s" },
182
183 { Opt_err, NULL }
184 };
185
186 enum {
187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
188
189 Opt_xprt_err
190 };
191
192 static const match_table_t nfs_xprt_protocol_tokens = {
193 { Opt_xprt_udp, "udp" },
194 { Opt_xprt_udp6, "udp6" },
195 { Opt_xprt_tcp, "tcp" },
196 { Opt_xprt_tcp6, "tcp6" },
197 { Opt_xprt_rdma, "rdma" },
198
199 { Opt_xprt_err, NULL }
200 };
201
202 enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209 };
210
211 static const match_table_t nfs_secflavor_tokens = {
212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
228 { Opt_sec_err, NULL }
229 };
230
231 enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236 };
237
238 static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245 };
246
247 enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252 };
253
254 static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261 };
262
263
264 static void nfs_umount_begin(struct super_block *);
265 static int nfs_statfs(struct dentry *, struct kstatfs *);
266 static int nfs_show_options(struct seq_file *, struct vfsmount *);
267 static int nfs_show_devname(struct seq_file *, struct vfsmount *);
268 static int nfs_show_path(struct seq_file *, struct vfsmount *);
269 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
270 static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
272 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
274 static void nfs_put_super(struct super_block *);
275 static void nfs_kill_super(struct super_block *);
276 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
277
278 static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
281 .mount = nfs_fs_mount,
282 .kill_sb = nfs_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
284 };
285
286 struct file_system_type nfs_xdev_fs_type = {
287 .owner = THIS_MODULE,
288 .name = "nfs",
289 .mount = nfs_xdev_mount,
290 .kill_sb = nfs_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
292 };
293
294 static const struct super_operations nfs_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .put_super = nfs_put_super,
299 .statfs = nfs_statfs,
300 .evict_inode = nfs_evict_inode,
301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
305 .show_stats = nfs_show_stats,
306 .remount_fs = nfs_remount,
307 };
308
309 #ifdef CONFIG_NFS_V4
310 static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
312 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
322 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
324 static void nfs4_kill_super(struct super_block *sb);
325
326 static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .mount = nfs4_mount,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332 };
333
334 static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
337 .mount = nfs4_remote_mount,
338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340 };
341
342 struct file_system_type nfs4_xdev_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_xdev_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348 };
349
350 static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_referral_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356 };
357
358 struct file_system_type nfs4_referral_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_referral_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364 };
365
366 static const struct super_operations nfs4_sops = {
367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
370 .put_super = nfs_put_super,
371 .statfs = nfs_statfs,
372 .evict_inode = nfs4_evict_inode,
373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
377 .show_stats = nfs_show_stats,
378 .remount_fs = nfs_remount,
379 };
380 #endif
381
382 static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385 };
386
387 /*
388 * Register the NFS filesystems
389 */
390 int __init register_nfs_fs(void)
391 {
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
401 #ifdef CONFIG_NFS_V4
402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405 #endif
406 register_shrinker(&acl_shrinker);
407 return 0;
408
409 #ifdef CONFIG_NFS_V4
410 error_2:
411 nfs_unregister_sysctl();
412 #endif
413 error_1:
414 unregister_filesystem(&nfs_fs_type);
415 error_0:
416 return ret;
417 }
418
419 /*
420 * Unregister the NFS filesystems
421 */
422 void __exit unregister_nfs_fs(void)
423 {
424 unregister_shrinker(&acl_shrinker);
425 #ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
427 #endif
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type);
430 }
431
432 void nfs_sb_active(struct super_block *sb)
433 {
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
438 }
439
440 void nfs_sb_deactive(struct super_block *sb)
441 {
442 struct nfs_server *server = NFS_SB(sb);
443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
446 }
447
448 /*
449 * Deliver file system statistics to userspace
450 */
451 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
452 {
453 struct nfs_server *server = NFS_SB(dentry->d_sb);
454 unsigned char blockbits;
455 unsigned long blockres;
456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
463
464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
474 nfs_free_fattr(res.fattr);
475 if (error < 0)
476 goto out_err;
477
478 buf->f_type = NFS_SUPER_MAGIC;
479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
485 buf->f_frsize = dentry->d_sb->s_blocksize;
486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
505
506 return 0;
507
508 out_err:
509 dprintk("%s: statfs error = %d\n", __func__, -error);
510 return error;
511 }
512
513 /*
514 * Map the security flavour number to a name
515 */
516 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517 {
518 static const struct {
519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
533 { UINT_MAX, "unknown" }
534 };
535 int i;
536
537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542 }
543
544 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581 }
582
583 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585 {
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
614 nfs_show_mountd_netid(m, nfss, showdefaults);
615 }
616
617 #ifdef CONFIG_NFS_V4
618 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620 {
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625 }
626 #else
627 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629 {
630 }
631 #endif
632
633 /*
634 * Describe the mount options in force on this server representation
635 */
636 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
638 {
639 static const struct proc_nfs_info {
640 int flag;
641 const char *str;
642 const char *nostr;
643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX, ",posix", "" },
646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
653 { 0, NULL, NULL }
654 };
655 const struct proc_nfs_info *nfs_infop;
656 struct nfs_client *clp = nfss->nfs_client;
657 u32 version = clp->rpc_ops->version;
658 int local_flock, local_fcntl;
659
660 seq_printf(m, ",vers=%u", version);
661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
680 seq_printf(m, ",proto=%s",
681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
719 }
720
721 /*
722 * Describe the mount options on this VFS mountpoint
723 */
724 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
725 {
726 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
727
728 nfs_show_mount_options(m, nfss, 0);
729
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733
734 return 0;
735 }
736
737 #ifdef CONFIG_NFS_V4
738 #ifdef CONFIG_NFS_V4_1
739 static void show_sessions(struct seq_file *m, struct nfs_server *server)
740 {
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743 }
744 #else
745 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746 #endif
747 #endif
748
749 #ifdef CONFIG_NFS_V4
750 #ifdef CONFIG_NFS_V4_1
751 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
752 {
753 seq_printf(m, ",pnfs=");
754 if (server->pnfs_curr_ld)
755 seq_printf(m, "%s", server->pnfs_curr_ld->name);
756 else
757 seq_printf(m, "not configured");
758 }
759 #else
760 static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
761 #endif
762 #endif
763
764 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
765 {
766 char *page = (char *) __get_free_page(GFP_KERNEL);
767 char *devname, *dummy;
768 int err = 0;
769 if (!page)
770 return -ENOMEM;
771 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
772 if (IS_ERR(devname))
773 err = PTR_ERR(devname);
774 else
775 seq_escape(m, devname, " \t\n\\");
776 free_page((unsigned long)page);
777 return err;
778 }
779
780 static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
781 {
782 seq_puts(m, "/");
783 return 0;
784 }
785
786 /*
787 * Present statistical information for this VFS mountpoint
788 */
789 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
790 {
791 int i, cpu;
792 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
793 struct rpc_auth *auth = nfss->client->cl_auth;
794 struct nfs_iostats totals = { };
795
796 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
797
798 /*
799 * Display all mount option settings
800 */
801 seq_printf(m, "\n\topts:\t");
802 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
803 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
804 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
805 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
806 nfs_show_mount_options(m, nfss, 1);
807
808 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
809
810 seq_printf(m, "\n\tcaps:\t");
811 seq_printf(m, "caps=0x%x", nfss->caps);
812 seq_printf(m, ",wtmult=%u", nfss->wtmult);
813 seq_printf(m, ",dtsize=%u", nfss->dtsize);
814 seq_printf(m, ",bsize=%u", nfss->bsize);
815 seq_printf(m, ",namlen=%u", nfss->namelen);
816
817 #ifdef CONFIG_NFS_V4
818 if (nfss->nfs_client->rpc_ops->version == 4) {
819 seq_printf(m, "\n\tnfsv4:\t");
820 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
821 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
822 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
823 show_sessions(m, nfss);
824 show_pnfs(m, nfss);
825 }
826 #endif
827
828 /*
829 * Display security flavor in effect for this mount
830 */
831 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
832 if (auth->au_flavor)
833 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
834
835 /*
836 * Display superblock I/O counters
837 */
838 for_each_possible_cpu(cpu) {
839 struct nfs_iostats *stats;
840
841 preempt_disable();
842 stats = per_cpu_ptr(nfss->io_stats, cpu);
843
844 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
845 totals.events[i] += stats->events[i];
846 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
847 totals.bytes[i] += stats->bytes[i];
848 #ifdef CONFIG_NFS_FSCACHE
849 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
850 totals.fscache[i] += stats->fscache[i];
851 #endif
852
853 preempt_enable();
854 }
855
856 seq_printf(m, "\n\tevents:\t");
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 seq_printf(m, "%lu ", totals.events[i]);
859 seq_printf(m, "\n\tbytes:\t");
860 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
862 #ifdef CONFIG_NFS_FSCACHE
863 if (nfss->options & NFS_OPTION_FSCACHE) {
864 seq_printf(m, "\n\tfsc:\t");
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 seq_printf(m, "%Lu ", totals.bytes[i]);
867 }
868 #endif
869 seq_printf(m, "\n");
870
871 rpc_print_iostats(m, nfss->client);
872
873 return 0;
874 }
875
876 /*
877 * Begin unmount by attempting to remove all automounted mountpoints we added
878 * in response to xdev traversals and referrals
879 */
880 static void nfs_umount_begin(struct super_block *sb)
881 {
882 struct nfs_server *server;
883 struct rpc_clnt *rpc;
884
885 server = NFS_SB(sb);
886 /* -EIO all pending I/O */
887 rpc = server->client_acl;
888 if (!IS_ERR(rpc))
889 rpc_killall_tasks(rpc);
890 rpc = server->client;
891 if (!IS_ERR(rpc))
892 rpc_killall_tasks(rpc);
893 }
894
895 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
896 {
897 struct nfs_parsed_mount_data *data;
898
899 data = kzalloc(sizeof(*data), GFP_KERNEL);
900 if (data) {
901 data->acregmin = NFS_DEF_ACREGMIN;
902 data->acregmax = NFS_DEF_ACREGMAX;
903 data->acdirmin = NFS_DEF_ACDIRMIN;
904 data->acdirmax = NFS_DEF_ACDIRMAX;
905 data->mount_server.port = NFS_UNSPEC_PORT;
906 data->nfs_server.port = NFS_UNSPEC_PORT;
907 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
908 data->auth_flavors[0] = RPC_AUTH_UNIX;
909 data->auth_flavor_len = 1;
910 data->version = version;
911 data->minorversion = 0;
912 }
913 return data;
914 }
915
916 /*
917 * Sanity-check a server address provided by the mount command.
918 *
919 * Address family must be initialized, and address must not be
920 * the ANY address for that family.
921 */
922 static int nfs_verify_server_address(struct sockaddr *addr)
923 {
924 switch (addr->sa_family) {
925 case AF_INET: {
926 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
927 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
928 }
929 case AF_INET6: {
930 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
931 return !ipv6_addr_any(sa);
932 }
933 }
934
935 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
936 return 0;
937 }
938
939 /*
940 * Select between a default port value and a user-specified port value.
941 * If a zero value is set, then autobind will be used.
942 */
943 static void nfs_set_port(struct sockaddr *sap, int *port,
944 const unsigned short default_port)
945 {
946 if (*port == NFS_UNSPEC_PORT)
947 *port = default_port;
948
949 rpc_set_port(sap, *port);
950 }
951
952 /*
953 * Sanity check the NFS transport protocol.
954 *
955 */
956 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
957 {
958 switch (mnt->nfs_server.protocol) {
959 case XPRT_TRANSPORT_UDP:
960 case XPRT_TRANSPORT_TCP:
961 case XPRT_TRANSPORT_RDMA:
962 break;
963 default:
964 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
965 }
966 }
967
968 /*
969 * For text based NFSv2/v3 mounts, the mount protocol transport default
970 * settings should depend upon the specified NFS transport.
971 */
972 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
973 {
974 nfs_validate_transport_protocol(mnt);
975
976 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
977 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
978 return;
979 switch (mnt->nfs_server.protocol) {
980 case XPRT_TRANSPORT_UDP:
981 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
982 break;
983 case XPRT_TRANSPORT_TCP:
984 case XPRT_TRANSPORT_RDMA:
985 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
986 }
987 }
988
989 /*
990 * Parse the value of the 'sec=' option.
991 */
992 static int nfs_parse_security_flavors(char *value,
993 struct nfs_parsed_mount_data *mnt)
994 {
995 substring_t args[MAX_OPT_ARGS];
996
997 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
998
999 switch (match_token(value, nfs_secflavor_tokens, args)) {
1000 case Opt_sec_none:
1001 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1002 break;
1003 case Opt_sec_sys:
1004 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1005 break;
1006 case Opt_sec_krb5:
1007 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1008 break;
1009 case Opt_sec_krb5i:
1010 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1011 break;
1012 case Opt_sec_krb5p:
1013 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1014 break;
1015 case Opt_sec_lkey:
1016 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1017 break;
1018 case Opt_sec_lkeyi:
1019 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1020 break;
1021 case Opt_sec_lkeyp:
1022 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1023 break;
1024 case Opt_sec_spkm:
1025 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1026 break;
1027 case Opt_sec_spkmi:
1028 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1029 break;
1030 case Opt_sec_spkmp:
1031 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1032 break;
1033 default:
1034 return 0;
1035 }
1036
1037 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1038 mnt->auth_flavor_len = 1;
1039 return 1;
1040 }
1041
1042 static int nfs_get_option_str(substring_t args[], char **option)
1043 {
1044 kfree(*option);
1045 *option = match_strdup(args);
1046 return !option;
1047 }
1048
1049 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1050 {
1051 int rc;
1052 char *string;
1053
1054 string = match_strdup(args);
1055 if (string == NULL)
1056 return -ENOMEM;
1057 rc = strict_strtoul(string, 10, option);
1058 kfree(string);
1059
1060 return rc;
1061 }
1062
1063 /*
1064 * Error-check and convert a string of mount options from user space into
1065 * a data structure. The whole mount string is processed; bad options are
1066 * skipped as they are encountered. If there were no errors, return 1;
1067 * otherwise return 0 (zero).
1068 */
1069 static int nfs_parse_mount_options(char *raw,
1070 struct nfs_parsed_mount_data *mnt)
1071 {
1072 char *p, *string, *secdata;
1073 int rc, sloppy = 0, invalid_option = 0;
1074 unsigned short protofamily = AF_UNSPEC;
1075 unsigned short mountfamily = AF_UNSPEC;
1076
1077 if (!raw) {
1078 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1079 return 1;
1080 }
1081 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1082
1083 secdata = alloc_secdata();
1084 if (!secdata)
1085 goto out_nomem;
1086
1087 rc = security_sb_copy_data(raw, secdata);
1088 if (rc)
1089 goto out_security_failure;
1090
1091 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1092 if (rc)
1093 goto out_security_failure;
1094
1095 free_secdata(secdata);
1096
1097 while ((p = strsep(&raw, ",")) != NULL) {
1098 substring_t args[MAX_OPT_ARGS];
1099 unsigned long option;
1100 int token;
1101
1102 if (!*p)
1103 continue;
1104
1105 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1106
1107 token = match_token(p, nfs_mount_option_tokens, args);
1108 switch (token) {
1109
1110 /*
1111 * boolean options: foo/nofoo
1112 */
1113 case Opt_soft:
1114 mnt->flags |= NFS_MOUNT_SOFT;
1115 break;
1116 case Opt_hard:
1117 mnt->flags &= ~NFS_MOUNT_SOFT;
1118 break;
1119 case Opt_posix:
1120 mnt->flags |= NFS_MOUNT_POSIX;
1121 break;
1122 case Opt_noposix:
1123 mnt->flags &= ~NFS_MOUNT_POSIX;
1124 break;
1125 case Opt_cto:
1126 mnt->flags &= ~NFS_MOUNT_NOCTO;
1127 break;
1128 case Opt_nocto:
1129 mnt->flags |= NFS_MOUNT_NOCTO;
1130 break;
1131 case Opt_ac:
1132 mnt->flags &= ~NFS_MOUNT_NOAC;
1133 break;
1134 case Opt_noac:
1135 mnt->flags |= NFS_MOUNT_NOAC;
1136 break;
1137 case Opt_lock:
1138 mnt->flags &= ~NFS_MOUNT_NONLM;
1139 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1140 NFS_MOUNT_LOCAL_FCNTL);
1141 break;
1142 case Opt_nolock:
1143 mnt->flags |= NFS_MOUNT_NONLM;
1144 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1145 NFS_MOUNT_LOCAL_FCNTL);
1146 break;
1147 case Opt_v2:
1148 mnt->flags &= ~NFS_MOUNT_VER3;
1149 mnt->version = 2;
1150 break;
1151 case Opt_v3:
1152 mnt->flags |= NFS_MOUNT_VER3;
1153 mnt->version = 3;
1154 break;
1155 case Opt_v4:
1156 mnt->flags &= ~NFS_MOUNT_VER3;
1157 mnt->version = 4;
1158 break;
1159 case Opt_udp:
1160 mnt->flags &= ~NFS_MOUNT_TCP;
1161 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1162 break;
1163 case Opt_tcp:
1164 mnt->flags |= NFS_MOUNT_TCP;
1165 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1166 break;
1167 case Opt_rdma:
1168 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1169 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1170 xprt_load_transport(p);
1171 break;
1172 case Opt_acl:
1173 mnt->flags &= ~NFS_MOUNT_NOACL;
1174 break;
1175 case Opt_noacl:
1176 mnt->flags |= NFS_MOUNT_NOACL;
1177 break;
1178 case Opt_rdirplus:
1179 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1180 break;
1181 case Opt_nordirplus:
1182 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1183 break;
1184 case Opt_sharecache:
1185 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1186 break;
1187 case Opt_nosharecache:
1188 mnt->flags |= NFS_MOUNT_UNSHARED;
1189 break;
1190 case Opt_resvport:
1191 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1192 break;
1193 case Opt_noresvport:
1194 mnt->flags |= NFS_MOUNT_NORESVPORT;
1195 break;
1196 case Opt_fscache:
1197 mnt->options |= NFS_OPTION_FSCACHE;
1198 kfree(mnt->fscache_uniq);
1199 mnt->fscache_uniq = NULL;
1200 break;
1201 case Opt_nofscache:
1202 mnt->options &= ~NFS_OPTION_FSCACHE;
1203 kfree(mnt->fscache_uniq);
1204 mnt->fscache_uniq = NULL;
1205 break;
1206
1207 /*
1208 * options that take numeric values
1209 */
1210 case Opt_port:
1211 if (nfs_get_option_ul(args, &option) ||
1212 option > USHRT_MAX)
1213 goto out_invalid_value;
1214 mnt->nfs_server.port = option;
1215 break;
1216 case Opt_rsize:
1217 if (nfs_get_option_ul(args, &option))
1218 goto out_invalid_value;
1219 mnt->rsize = option;
1220 break;
1221 case Opt_wsize:
1222 if (nfs_get_option_ul(args, &option))
1223 goto out_invalid_value;
1224 mnt->wsize = option;
1225 break;
1226 case Opt_bsize:
1227 if (nfs_get_option_ul(args, &option))
1228 goto out_invalid_value;
1229 mnt->bsize = option;
1230 break;
1231 case Opt_timeo:
1232 if (nfs_get_option_ul(args, &option) || option == 0)
1233 goto out_invalid_value;
1234 mnt->timeo = option;
1235 break;
1236 case Opt_retrans:
1237 if (nfs_get_option_ul(args, &option) || option == 0)
1238 goto out_invalid_value;
1239 mnt->retrans = option;
1240 break;
1241 case Opt_acregmin:
1242 if (nfs_get_option_ul(args, &option))
1243 goto out_invalid_value;
1244 mnt->acregmin = option;
1245 break;
1246 case Opt_acregmax:
1247 if (nfs_get_option_ul(args, &option))
1248 goto out_invalid_value;
1249 mnt->acregmax = option;
1250 break;
1251 case Opt_acdirmin:
1252 if (nfs_get_option_ul(args, &option))
1253 goto out_invalid_value;
1254 mnt->acdirmin = option;
1255 break;
1256 case Opt_acdirmax:
1257 if (nfs_get_option_ul(args, &option))
1258 goto out_invalid_value;
1259 mnt->acdirmax = option;
1260 break;
1261 case Opt_actimeo:
1262 if (nfs_get_option_ul(args, &option))
1263 goto out_invalid_value;
1264 mnt->acregmin = mnt->acregmax =
1265 mnt->acdirmin = mnt->acdirmax = option;
1266 break;
1267 case Opt_namelen:
1268 if (nfs_get_option_ul(args, &option))
1269 goto out_invalid_value;
1270 mnt->namlen = option;
1271 break;
1272 case Opt_mountport:
1273 if (nfs_get_option_ul(args, &option) ||
1274 option > USHRT_MAX)
1275 goto out_invalid_value;
1276 mnt->mount_server.port = option;
1277 break;
1278 case Opt_mountvers:
1279 if (nfs_get_option_ul(args, &option) ||
1280 option < NFS_MNT_VERSION ||
1281 option > NFS_MNT3_VERSION)
1282 goto out_invalid_value;
1283 mnt->mount_server.version = option;
1284 break;
1285 case Opt_nfsvers:
1286 if (nfs_get_option_ul(args, &option))
1287 goto out_invalid_value;
1288 switch (option) {
1289 case NFS2_VERSION:
1290 mnt->flags &= ~NFS_MOUNT_VER3;
1291 mnt->version = 2;
1292 break;
1293 case NFS3_VERSION:
1294 mnt->flags |= NFS_MOUNT_VER3;
1295 mnt->version = 3;
1296 break;
1297 case NFS4_VERSION:
1298 mnt->flags &= ~NFS_MOUNT_VER3;
1299 mnt->version = 4;
1300 break;
1301 default:
1302 goto out_invalid_value;
1303 }
1304 break;
1305 case Opt_minorversion:
1306 if (nfs_get_option_ul(args, &option))
1307 goto out_invalid_value;
1308 if (option > NFS4_MAX_MINOR_VERSION)
1309 goto out_invalid_value;
1310 mnt->minorversion = option;
1311 break;
1312
1313 /*
1314 * options that take text values
1315 */
1316 case Opt_sec:
1317 string = match_strdup(args);
1318 if (string == NULL)
1319 goto out_nomem;
1320 rc = nfs_parse_security_flavors(string, mnt);
1321 kfree(string);
1322 if (!rc) {
1323 dfprintk(MOUNT, "NFS: unrecognized "
1324 "security flavor\n");
1325 return 0;
1326 }
1327 break;
1328 case Opt_proto:
1329 string = match_strdup(args);
1330 if (string == NULL)
1331 goto out_nomem;
1332 token = match_token(string,
1333 nfs_xprt_protocol_tokens, args);
1334
1335 protofamily = AF_INET;
1336 switch (token) {
1337 case Opt_xprt_udp6:
1338 protofamily = AF_INET6;
1339 case Opt_xprt_udp:
1340 mnt->flags &= ~NFS_MOUNT_TCP;
1341 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1342 break;
1343 case Opt_xprt_tcp6:
1344 protofamily = AF_INET6;
1345 case Opt_xprt_tcp:
1346 mnt->flags |= NFS_MOUNT_TCP;
1347 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1348 break;
1349 case Opt_xprt_rdma:
1350 /* vector side protocols to TCP */
1351 mnt->flags |= NFS_MOUNT_TCP;
1352 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1353 xprt_load_transport(string);
1354 break;
1355 default:
1356 dfprintk(MOUNT, "NFS: unrecognized "
1357 "transport protocol\n");
1358 kfree(string);
1359 return 0;
1360 }
1361 kfree(string);
1362 break;
1363 case Opt_mountproto:
1364 string = match_strdup(args);
1365 if (string == NULL)
1366 goto out_nomem;
1367 token = match_token(string,
1368 nfs_xprt_protocol_tokens, args);
1369 kfree(string);
1370
1371 mountfamily = AF_INET;
1372 switch (token) {
1373 case Opt_xprt_udp6:
1374 mountfamily = AF_INET6;
1375 case Opt_xprt_udp:
1376 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1377 break;
1378 case Opt_xprt_tcp6:
1379 mountfamily = AF_INET6;
1380 case Opt_xprt_tcp:
1381 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1382 break;
1383 case Opt_xprt_rdma: /* not used for side protocols */
1384 default:
1385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "transport protocol\n");
1387 return 0;
1388 }
1389 break;
1390 case Opt_addr:
1391 string = match_strdup(args);
1392 if (string == NULL)
1393 goto out_nomem;
1394 mnt->nfs_server.addrlen =
1395 rpc_pton(string, strlen(string),
1396 (struct sockaddr *)
1397 &mnt->nfs_server.address,
1398 sizeof(mnt->nfs_server.address));
1399 kfree(string);
1400 if (mnt->nfs_server.addrlen == 0)
1401 goto out_invalid_address;
1402 break;
1403 case Opt_clientaddr:
1404 if (nfs_get_option_str(args, &mnt->client_address))
1405 goto out_nomem;
1406 break;
1407 case Opt_mounthost:
1408 if (nfs_get_option_str(args,
1409 &mnt->mount_server.hostname))
1410 goto out_nomem;
1411 break;
1412 case Opt_mountaddr:
1413 string = match_strdup(args);
1414 if (string == NULL)
1415 goto out_nomem;
1416 mnt->mount_server.addrlen =
1417 rpc_pton(string, strlen(string),
1418 (struct sockaddr *)
1419 &mnt->mount_server.address,
1420 sizeof(mnt->mount_server.address));
1421 kfree(string);
1422 if (mnt->mount_server.addrlen == 0)
1423 goto out_invalid_address;
1424 break;
1425 case Opt_lookupcache:
1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
1429 token = match_token(string,
1430 nfs_lookupcache_tokens, args);
1431 kfree(string);
1432 switch (token) {
1433 case Opt_lookupcache_all:
1434 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1435 break;
1436 case Opt_lookupcache_positive:
1437 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1438 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1439 break;
1440 case Opt_lookupcache_none:
1441 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1442 break;
1443 default:
1444 dfprintk(MOUNT, "NFS: invalid "
1445 "lookupcache argument\n");
1446 return 0;
1447 };
1448 break;
1449 case Opt_fscache_uniq:
1450 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1451 goto out_nomem;
1452 mnt->options |= NFS_OPTION_FSCACHE;
1453 break;
1454 case Opt_local_lock:
1455 string = match_strdup(args);
1456 if (string == NULL)
1457 goto out_nomem;
1458 token = match_token(string, nfs_local_lock_tokens,
1459 args);
1460 kfree(string);
1461 switch (token) {
1462 case Opt_local_lock_all:
1463 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1464 NFS_MOUNT_LOCAL_FCNTL);
1465 break;
1466 case Opt_local_lock_flock:
1467 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1468 break;
1469 case Opt_local_lock_posix:
1470 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1471 break;
1472 case Opt_local_lock_none:
1473 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1474 NFS_MOUNT_LOCAL_FCNTL);
1475 break;
1476 default:
1477 dfprintk(MOUNT, "NFS: invalid "
1478 "local_lock argument\n");
1479 return 0;
1480 };
1481 break;
1482
1483 /*
1484 * Special options
1485 */
1486 case Opt_sloppy:
1487 sloppy = 1;
1488 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1489 break;
1490 case Opt_userspace:
1491 case Opt_deprecated:
1492 dfprintk(MOUNT, "NFS: ignoring mount option "
1493 "'%s'\n", p);
1494 break;
1495
1496 default:
1497 invalid_option = 1;
1498 dfprintk(MOUNT, "NFS: unrecognized mount option "
1499 "'%s'\n", p);
1500 }
1501 }
1502
1503 if (!sloppy && invalid_option)
1504 return 0;
1505
1506 /*
1507 * verify that any proto=/mountproto= options match the address
1508 * familiies in the addr=/mountaddr= options.
1509 */
1510 if (protofamily != AF_UNSPEC &&
1511 protofamily != mnt->nfs_server.address.ss_family)
1512 goto out_proto_mismatch;
1513
1514 if (mountfamily != AF_UNSPEC) {
1515 if (mnt->mount_server.addrlen) {
1516 if (mountfamily != mnt->mount_server.address.ss_family)
1517 goto out_mountproto_mismatch;
1518 } else {
1519 if (mountfamily != mnt->nfs_server.address.ss_family)
1520 goto out_mountproto_mismatch;
1521 }
1522 }
1523
1524 return 1;
1525
1526 out_mountproto_mismatch:
1527 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1528 "option\n");
1529 return 0;
1530 out_proto_mismatch:
1531 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1532 return 0;
1533 out_invalid_address:
1534 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1535 return 0;
1536 out_invalid_value:
1537 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1538 return 0;
1539 out_nomem:
1540 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1541 return 0;
1542 out_security_failure:
1543 free_secdata(secdata);
1544 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1545 return 0;
1546 }
1547
1548 /*
1549 * Match the requested auth flavors with the list returned by
1550 * the server. Returns zero and sets the mount's authentication
1551 * flavor on success; returns -EACCES if server does not support
1552 * the requested flavor.
1553 */
1554 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1555 struct nfs_mount_request *request)
1556 {
1557 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1558
1559 /*
1560 * Certain releases of Linux's mountd return an empty
1561 * flavor list. To prevent behavioral regression with
1562 * these servers (ie. rejecting mounts that used to
1563 * succeed), revert to pre-2.6.32 behavior (no checking)
1564 * if the returned flavor list is empty.
1565 */
1566 if (server_authlist_len == 0)
1567 return 0;
1568
1569 /*
1570 * We avoid sophisticated negotiating here, as there are
1571 * plenty of cases where we can get it wrong, providing
1572 * either too little or too much security.
1573 *
1574 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1575 * flavor listed first. However, some servers list
1576 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1577 * preferred default, in args->auth_flavors[0] if user
1578 * didn't specify sec= mount option.
1579 */
1580 for (i = 0; i < args->auth_flavor_len; i++)
1581 for (j = 0; j < server_authlist_len; j++)
1582 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1583 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1584 request->auth_flavs[j]);
1585 args->auth_flavors[0] = request->auth_flavs[j];
1586 return 0;
1587 }
1588
1589 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1590 nfs_umount(request);
1591 return -EACCES;
1592 }
1593
1594 /*
1595 * Use the remote server's MOUNT service to request the NFS file handle
1596 * corresponding to the provided path.
1597 */
1598 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1599 struct nfs_fh *root_fh)
1600 {
1601 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1602 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1603 struct nfs_mount_request request = {
1604 .sap = (struct sockaddr *)
1605 &args->mount_server.address,
1606 .dirpath = args->nfs_server.export_path,
1607 .protocol = args->mount_server.protocol,
1608 .fh = root_fh,
1609 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1610 .auth_flav_len = &server_authlist_len,
1611 .auth_flavs = server_authlist,
1612 };
1613 int status;
1614
1615 if (args->mount_server.version == 0) {
1616 switch (args->version) {
1617 default:
1618 args->mount_server.version = NFS_MNT3_VERSION;
1619 break;
1620 case 2:
1621 args->mount_server.version = NFS_MNT_VERSION;
1622 }
1623 }
1624 request.version = args->mount_server.version;
1625
1626 if (args->mount_server.hostname)
1627 request.hostname = args->mount_server.hostname;
1628 else
1629 request.hostname = args->nfs_server.hostname;
1630
1631 /*
1632 * Construct the mount server's address.
1633 */
1634 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1635 memcpy(request.sap, &args->nfs_server.address,
1636 args->nfs_server.addrlen);
1637 args->mount_server.addrlen = args->nfs_server.addrlen;
1638 }
1639 request.salen = args->mount_server.addrlen;
1640 nfs_set_port(request.sap, &args->mount_server.port, 0);
1641
1642 /*
1643 * Now ask the mount server to map our export path
1644 * to a file handle.
1645 */
1646 status = nfs_mount(&request);
1647 if (status != 0) {
1648 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1649 request.hostname, status);
1650 return status;
1651 }
1652
1653 /*
1654 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1655 */
1656 if (args->mount_server.version != NFS_MNT3_VERSION)
1657 return 0;
1658 return nfs_walk_authlist(args, &request);
1659 }
1660
1661 /*
1662 * Split "dev_name" into "hostname:export_path".
1663 *
1664 * The leftmost colon demarks the split between the server's hostname
1665 * and the export path. If the hostname starts with a left square
1666 * bracket, then it may contain colons.
1667 *
1668 * Note: caller frees hostname and export path, even on error.
1669 */
1670 static int nfs_parse_devname(const char *dev_name,
1671 char **hostname, size_t maxnamlen,
1672 char **export_path, size_t maxpathlen)
1673 {
1674 size_t len;
1675 char *end;
1676
1677 /* Is the host name protected with square brakcets? */
1678 if (*dev_name == '[') {
1679 end = strchr(++dev_name, ']');
1680 if (end == NULL || end[1] != ':')
1681 goto out_bad_devname;
1682
1683 len = end - dev_name;
1684 end++;
1685 } else {
1686 char *comma;
1687
1688 end = strchr(dev_name, ':');
1689 if (end == NULL)
1690 goto out_bad_devname;
1691 len = end - dev_name;
1692
1693 /* kill possible hostname list: not supported */
1694 comma = strchr(dev_name, ',');
1695 if (comma != NULL && comma < end)
1696 *comma = 0;
1697 }
1698
1699 if (len > maxnamlen)
1700 goto out_hostname;
1701
1702 /* N.B. caller will free nfs_server.hostname in all cases */
1703 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1704 if (*hostname == NULL)
1705 goto out_nomem;
1706 len = strlen(++end);
1707 if (len > maxpathlen)
1708 goto out_path;
1709 *export_path = kstrndup(end, len, GFP_KERNEL);
1710 if (!*export_path)
1711 goto out_nomem;
1712
1713 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1714 return 0;
1715
1716 out_bad_devname:
1717 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1718 return -EINVAL;
1719
1720 out_nomem:
1721 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1722 return -ENOMEM;
1723
1724 out_hostname:
1725 dfprintk(MOUNT, "NFS: server hostname too long\n");
1726 return -ENAMETOOLONG;
1727
1728 out_path:
1729 dfprintk(MOUNT, "NFS: export pathname too long\n");
1730 return -ENAMETOOLONG;
1731 }
1732
1733 /*
1734 * Validate the NFS2/NFS3 mount data
1735 * - fills in the mount root filehandle
1736 *
1737 * For option strings, user space handles the following behaviors:
1738 *
1739 * + DNS: mapping server host name to IP address ("addr=" option)
1740 *
1741 * + failure mode: how to behave if a mount request can't be handled
1742 * immediately ("fg/bg" option)
1743 *
1744 * + retry: how often to retry a mount request ("retry=" option)
1745 *
1746 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1747 * mountproto=tcp after mountproto=udp, and so on
1748 */
1749 static int nfs_validate_mount_data(void *options,
1750 struct nfs_parsed_mount_data *args,
1751 struct nfs_fh *mntfh,
1752 const char *dev_name)
1753 {
1754 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1755 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1756
1757 if (data == NULL)
1758 goto out_no_data;
1759
1760 switch (data->version) {
1761 case 1:
1762 data->namlen = 0;
1763 case 2:
1764 data->bsize = 0;
1765 case 3:
1766 if (data->flags & NFS_MOUNT_VER3)
1767 goto out_no_v3;
1768 data->root.size = NFS2_FHSIZE;
1769 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1770 case 4:
1771 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1772 goto out_no_sec;
1773 case 5:
1774 memset(data->context, 0, sizeof(data->context));
1775 case 6:
1776 if (data->flags & NFS_MOUNT_VER3) {
1777 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1778 goto out_invalid_fh;
1779 mntfh->size = data->root.size;
1780 args->version = 3;
1781 } else {
1782 mntfh->size = NFS2_FHSIZE;
1783 args->version = 2;
1784 }
1785
1786
1787 memcpy(mntfh->data, data->root.data, mntfh->size);
1788 if (mntfh->size < sizeof(mntfh->data))
1789 memset(mntfh->data + mntfh->size, 0,
1790 sizeof(mntfh->data) - mntfh->size);
1791
1792 /*
1793 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1794 * can deal with.
1795 */
1796 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1797 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1798 args->rsize = data->rsize;
1799 args->wsize = data->wsize;
1800 args->timeo = data->timeo;
1801 args->retrans = data->retrans;
1802 args->acregmin = data->acregmin;
1803 args->acregmax = data->acregmax;
1804 args->acdirmin = data->acdirmin;
1805 args->acdirmax = data->acdirmax;
1806
1807 memcpy(sap, &data->addr, sizeof(data->addr));
1808 args->nfs_server.addrlen = sizeof(data->addr);
1809 if (!nfs_verify_server_address(sap))
1810 goto out_no_address;
1811
1812 if (!(data->flags & NFS_MOUNT_TCP))
1813 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1814 /* N.B. caller will free nfs_server.hostname in all cases */
1815 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1816 args->namlen = data->namlen;
1817 args->bsize = data->bsize;
1818
1819 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1820 args->auth_flavors[0] = data->pseudoflavor;
1821 if (!args->nfs_server.hostname)
1822 goto out_nomem;
1823
1824 if (!(data->flags & NFS_MOUNT_NONLM))
1825 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1826 NFS_MOUNT_LOCAL_FCNTL);
1827 else
1828 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1829 NFS_MOUNT_LOCAL_FCNTL);
1830 /*
1831 * The legacy version 6 binary mount data from userspace has a
1832 * field used only to transport selinux information into the
1833 * the kernel. To continue to support that functionality we
1834 * have a touch of selinux knowledge here in the NFS code. The
1835 * userspace code converted context=blah to just blah so we are
1836 * converting back to the full string selinux understands.
1837 */
1838 if (data->context[0]){
1839 #ifdef CONFIG_SECURITY_SELINUX
1840 int rc;
1841 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1842 if (!opts_str)
1843 return -ENOMEM;
1844 strcpy(opts_str, "context=");
1845 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1846 strcat(opts_str, &data->context[0]);
1847 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1848 kfree(opts_str);
1849 if (rc)
1850 return rc;
1851 #else
1852 return -EINVAL;
1853 #endif
1854 }
1855
1856 break;
1857 default: {
1858 int status;
1859
1860 if (nfs_parse_mount_options((char *)options, args) == 0)
1861 return -EINVAL;
1862
1863 if (!nfs_verify_server_address(sap))
1864 goto out_no_address;
1865
1866 if (args->version == 4)
1867 #ifdef CONFIG_NFS_V4
1868 return nfs4_validate_text_mount_data(options,
1869 args, dev_name);
1870 #else
1871 goto out_v4_not_compiled;
1872 #endif
1873
1874 nfs_set_port(sap, &args->nfs_server.port, 0);
1875
1876 nfs_set_mount_transport_protocol(args);
1877
1878 status = nfs_parse_devname(dev_name,
1879 &args->nfs_server.hostname,
1880 PAGE_SIZE,
1881 &args->nfs_server.export_path,
1882 NFS_MAXPATHLEN);
1883 if (!status)
1884 status = nfs_try_mount(args, mntfh);
1885
1886 kfree(args->nfs_server.export_path);
1887 args->nfs_server.export_path = NULL;
1888
1889 if (status)
1890 return status;
1891
1892 break;
1893 }
1894 }
1895
1896 #ifndef CONFIG_NFS_V3
1897 if (args->version == 3)
1898 goto out_v3_not_compiled;
1899 #endif /* !CONFIG_NFS_V3 */
1900
1901 return 0;
1902
1903 out_no_data:
1904 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1905 return -EINVAL;
1906
1907 out_no_v3:
1908 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1909 data->version);
1910 return -EINVAL;
1911
1912 out_no_sec:
1913 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1914 return -EINVAL;
1915
1916 #ifndef CONFIG_NFS_V3
1917 out_v3_not_compiled:
1918 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1919 return -EPROTONOSUPPORT;
1920 #endif /* !CONFIG_NFS_V3 */
1921
1922 #ifndef CONFIG_NFS_V4
1923 out_v4_not_compiled:
1924 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1925 return -EPROTONOSUPPORT;
1926 #endif /* !CONFIG_NFS_V4 */
1927
1928 out_nomem:
1929 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1930 return -ENOMEM;
1931
1932 out_no_address:
1933 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1934 return -EINVAL;
1935
1936 out_invalid_fh:
1937 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1938 return -EINVAL;
1939 }
1940
1941 static int
1942 nfs_compare_remount_data(struct nfs_server *nfss,
1943 struct nfs_parsed_mount_data *data)
1944 {
1945 if (data->flags != nfss->flags ||
1946 data->rsize != nfss->rsize ||
1947 data->wsize != nfss->wsize ||
1948 data->retrans != nfss->client->cl_timeout->to_retries ||
1949 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1950 data->acregmin != nfss->acregmin / HZ ||
1951 data->acregmax != nfss->acregmax / HZ ||
1952 data->acdirmin != nfss->acdirmin / HZ ||
1953 data->acdirmax != nfss->acdirmax / HZ ||
1954 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1955 data->nfs_server.port != nfss->port ||
1956 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1957 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1958 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1959 return -EINVAL;
1960
1961 return 0;
1962 }
1963
1964 static int
1965 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1966 {
1967 int error;
1968 struct nfs_server *nfss = sb->s_fs_info;
1969 struct nfs_parsed_mount_data *data;
1970 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1971 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1972 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1973
1974 /*
1975 * Userspace mount programs that send binary options generally send
1976 * them populated with default values. We have no way to know which
1977 * ones were explicitly specified. Fall back to legacy behavior and
1978 * just return success.
1979 */
1980 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1981 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1982 options->version <= 6))))
1983 return 0;
1984
1985 data = kzalloc(sizeof(*data), GFP_KERNEL);
1986 if (data == NULL)
1987 return -ENOMEM;
1988
1989 /* fill out struct with values from existing mount */
1990 data->flags = nfss->flags;
1991 data->rsize = nfss->rsize;
1992 data->wsize = nfss->wsize;
1993 data->retrans = nfss->client->cl_timeout->to_retries;
1994 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1995 data->acregmin = nfss->acregmin / HZ;
1996 data->acregmax = nfss->acregmax / HZ;
1997 data->acdirmin = nfss->acdirmin / HZ;
1998 data->acdirmax = nfss->acdirmax / HZ;
1999 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2000 data->nfs_server.port = nfss->port;
2001 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2002 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2003 data->nfs_server.addrlen);
2004
2005 /* overwrite those values with any that were specified */
2006 error = nfs_parse_mount_options((char *)options, data);
2007 if (error < 0)
2008 goto out;
2009
2010 /*
2011 * noac is a special case. It implies -o sync, but that's not
2012 * necessarily reflected in the mtab options. do_remount_sb
2013 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2014 * remount options, so we have to explicitly reset it.
2015 */
2016 if (data->flags & NFS_MOUNT_NOAC)
2017 *flags |= MS_SYNCHRONOUS;
2018
2019 /* compare new mount options with old ones */
2020 error = nfs_compare_remount_data(nfss, data);
2021 out:
2022 kfree(data);
2023 return error;
2024 }
2025
2026 /*
2027 * Initialise the common bits of the superblock
2028 */
2029 static inline void nfs_initialise_sb(struct super_block *sb)
2030 {
2031 struct nfs_server *server = NFS_SB(sb);
2032
2033 sb->s_magic = NFS_SUPER_MAGIC;
2034
2035 /* We probably want something more informative here */
2036 snprintf(sb->s_id, sizeof(sb->s_id),
2037 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2038
2039 if (sb->s_blocksize == 0)
2040 sb->s_blocksize = nfs_block_bits(server->wsize,
2041 &sb->s_blocksize_bits);
2042
2043 sb->s_bdi = &server->backing_dev_info;
2044
2045 nfs_super_set_maxbytes(sb, server->maxfilesize);
2046 }
2047
2048 /*
2049 * Finish setting up an NFS2/3 superblock
2050 */
2051 static void nfs_fill_super(struct super_block *sb,
2052 struct nfs_parsed_mount_data *data)
2053 {
2054 struct nfs_server *server = NFS_SB(sb);
2055
2056 sb->s_blocksize_bits = 0;
2057 sb->s_blocksize = 0;
2058 if (data->bsize)
2059 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2060
2061 if (server->nfs_client->rpc_ops->version == 3) {
2062 /* The VFS shouldn't apply the umask to mode bits. We will do
2063 * so ourselves when necessary.
2064 */
2065 sb->s_flags |= MS_POSIXACL;
2066 sb->s_time_gran = 1;
2067 }
2068
2069 sb->s_op = &nfs_sops;
2070 nfs_initialise_sb(sb);
2071 }
2072
2073 /*
2074 * Finish setting up a cloned NFS2/3 superblock
2075 */
2076 static void nfs_clone_super(struct super_block *sb,
2077 const struct super_block *old_sb)
2078 {
2079 struct nfs_server *server = NFS_SB(sb);
2080
2081 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2082 sb->s_blocksize = old_sb->s_blocksize;
2083 sb->s_maxbytes = old_sb->s_maxbytes;
2084
2085 if (server->nfs_client->rpc_ops->version == 3) {
2086 /* The VFS shouldn't apply the umask to mode bits. We will do
2087 * so ourselves when necessary.
2088 */
2089 sb->s_flags |= MS_POSIXACL;
2090 sb->s_time_gran = 1;
2091 }
2092
2093 sb->s_op = old_sb->s_op;
2094 nfs_initialise_sb(sb);
2095 }
2096
2097 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2098 {
2099 const struct nfs_server *a = s->s_fs_info;
2100 const struct rpc_clnt *clnt_a = a->client;
2101 const struct rpc_clnt *clnt_b = b->client;
2102
2103 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2104 goto Ebusy;
2105 if (a->nfs_client != b->nfs_client)
2106 goto Ebusy;
2107 if (a->flags != b->flags)
2108 goto Ebusy;
2109 if (a->wsize != b->wsize)
2110 goto Ebusy;
2111 if (a->rsize != b->rsize)
2112 goto Ebusy;
2113 if (a->acregmin != b->acregmin)
2114 goto Ebusy;
2115 if (a->acregmax != b->acregmax)
2116 goto Ebusy;
2117 if (a->acdirmin != b->acdirmin)
2118 goto Ebusy;
2119 if (a->acdirmax != b->acdirmax)
2120 goto Ebusy;
2121 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2122 goto Ebusy;
2123 return 1;
2124 Ebusy:
2125 return 0;
2126 }
2127
2128 struct nfs_sb_mountdata {
2129 struct nfs_server *server;
2130 int mntflags;
2131 };
2132
2133 static int nfs_set_super(struct super_block *s, void *data)
2134 {
2135 struct nfs_sb_mountdata *sb_mntdata = data;
2136 struct nfs_server *server = sb_mntdata->server;
2137 int ret;
2138
2139 s->s_flags = sb_mntdata->mntflags;
2140 s->s_fs_info = server;
2141 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2142 ret = set_anon_super(s, server);
2143 if (ret == 0)
2144 server->s_dev = s->s_dev;
2145 return ret;
2146 }
2147
2148 static int nfs_compare_super_address(struct nfs_server *server1,
2149 struct nfs_server *server2)
2150 {
2151 struct sockaddr *sap1, *sap2;
2152
2153 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2154 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2155
2156 if (sap1->sa_family != sap2->sa_family)
2157 return 0;
2158
2159 switch (sap1->sa_family) {
2160 case AF_INET: {
2161 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2162 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2163 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2164 return 0;
2165 if (sin1->sin_port != sin2->sin_port)
2166 return 0;
2167 break;
2168 }
2169 case AF_INET6: {
2170 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2171 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2172 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2173 return 0;
2174 if (sin1->sin6_port != sin2->sin6_port)
2175 return 0;
2176 break;
2177 }
2178 default:
2179 return 0;
2180 }
2181
2182 return 1;
2183 }
2184
2185 static int nfs_compare_super(struct super_block *sb, void *data)
2186 {
2187 struct nfs_sb_mountdata *sb_mntdata = data;
2188 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2189 int mntflags = sb_mntdata->mntflags;
2190
2191 if (!nfs_compare_super_address(old, server))
2192 return 0;
2193 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2194 if (old->flags & NFS_MOUNT_UNSHARED)
2195 return 0;
2196 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2197 return 0;
2198 return nfs_compare_mount_options(sb, server, mntflags);
2199 }
2200
2201 static int nfs_bdi_register(struct nfs_server *server)
2202 {
2203 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2204 }
2205
2206 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2207 int flags, const char *dev_name, void *raw_data)
2208 {
2209 struct nfs_server *server = NULL;
2210 struct super_block *s;
2211 struct nfs_parsed_mount_data *data;
2212 struct nfs_fh *mntfh;
2213 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2214 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2215 struct nfs_sb_mountdata sb_mntdata = {
2216 .mntflags = flags,
2217 };
2218 int error;
2219
2220 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2221 mntfh = nfs_alloc_fhandle();
2222 if (data == NULL || mntfh == NULL)
2223 goto out_free_fh;
2224
2225 security_init_mnt_opts(&data->lsm_opts);
2226
2227 /* Validate the mount data */
2228 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2229 if (error < 0) {
2230 mntroot = ERR_PTR(error);
2231 goto out;
2232 }
2233
2234 #ifdef CONFIG_NFS_V4
2235 if (data->version == 4) {
2236 mntroot = nfs4_try_mount(flags, dev_name, data);
2237 kfree(data->client_address);
2238 kfree(data->nfs_server.export_path);
2239 goto out;
2240 }
2241 #endif /* CONFIG_NFS_V4 */
2242
2243 /* Get a volume representation */
2244 server = nfs_create_server(data, mntfh);
2245 if (IS_ERR(server)) {
2246 mntroot = ERR_CAST(server);
2247 goto out;
2248 }
2249 sb_mntdata.server = server;
2250
2251 if (server->flags & NFS_MOUNT_UNSHARED)
2252 compare_super = NULL;
2253
2254 /* -o noac implies -o sync */
2255 if (server->flags & NFS_MOUNT_NOAC)
2256 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2257
2258 /* Get a superblock - note that we may end up sharing one that already exists */
2259 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2260 if (IS_ERR(s)) {
2261 mntroot = ERR_CAST(s);
2262 goto out_err_nosb;
2263 }
2264
2265 if (s->s_fs_info != server) {
2266 nfs_free_server(server);
2267 server = NULL;
2268 } else {
2269 error = nfs_bdi_register(server);
2270 if (error) {
2271 mntroot = ERR_PTR(error);
2272 goto error_splat_bdi;
2273 }
2274 }
2275
2276 if (!s->s_root) {
2277 /* initial superblock/root creation */
2278 nfs_fill_super(s, data);
2279 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2280 }
2281
2282 mntroot = nfs_get_root(s, mntfh, dev_name);
2283 if (IS_ERR(mntroot))
2284 goto error_splat_super;
2285
2286 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2287 if (error)
2288 goto error_splat_root;
2289
2290 s->s_flags |= MS_ACTIVE;
2291
2292 out:
2293 kfree(data->nfs_server.hostname);
2294 kfree(data->mount_server.hostname);
2295 kfree(data->fscache_uniq);
2296 security_free_mnt_opts(&data->lsm_opts);
2297 out_free_fh:
2298 nfs_free_fhandle(mntfh);
2299 kfree(data);
2300 return mntroot;
2301
2302 out_err_nosb:
2303 nfs_free_server(server);
2304 goto out;
2305
2306 error_splat_root:
2307 dput(mntroot);
2308 mntroot = ERR_PTR(error);
2309 error_splat_super:
2310 if (server && !s->s_root)
2311 bdi_unregister(&server->backing_dev_info);
2312 error_splat_bdi:
2313 deactivate_locked_super(s);
2314 goto out;
2315 }
2316
2317 /*
2318 * Ensure that we unregister the bdi before kill_anon_super
2319 * releases the device name
2320 */
2321 static void nfs_put_super(struct super_block *s)
2322 {
2323 struct nfs_server *server = NFS_SB(s);
2324
2325 bdi_unregister(&server->backing_dev_info);
2326 }
2327
2328 /*
2329 * Destroy an NFS2/3 superblock
2330 */
2331 static void nfs_kill_super(struct super_block *s)
2332 {
2333 struct nfs_server *server = NFS_SB(s);
2334
2335 kill_anon_super(s);
2336 nfs_fscache_release_super_cookie(s);
2337 nfs_free_server(server);
2338 }
2339
2340 /*
2341 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2342 */
2343 static struct dentry *
2344 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2345 const char *dev_name, void *raw_data)
2346 {
2347 struct nfs_clone_mount *data = raw_data;
2348 struct super_block *s;
2349 struct nfs_server *server;
2350 struct dentry *mntroot;
2351 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2352 struct nfs_sb_mountdata sb_mntdata = {
2353 .mntflags = flags,
2354 };
2355 int error;
2356
2357 dprintk("--> nfs_xdev_mount()\n");
2358
2359 /* create a new volume representation */
2360 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2361 if (IS_ERR(server)) {
2362 error = PTR_ERR(server);
2363 goto out_err_noserver;
2364 }
2365 sb_mntdata.server = server;
2366
2367 if (server->flags & NFS_MOUNT_UNSHARED)
2368 compare_super = NULL;
2369
2370 /* -o noac implies -o sync */
2371 if (server->flags & NFS_MOUNT_NOAC)
2372 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2373
2374 /* Get a superblock - note that we may end up sharing one that already exists */
2375 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2376 if (IS_ERR(s)) {
2377 error = PTR_ERR(s);
2378 goto out_err_nosb;
2379 }
2380
2381 if (s->s_fs_info != server) {
2382 nfs_free_server(server);
2383 server = NULL;
2384 } else {
2385 error = nfs_bdi_register(server);
2386 if (error)
2387 goto error_splat_bdi;
2388 }
2389
2390 if (!s->s_root) {
2391 /* initial superblock/root creation */
2392 nfs_clone_super(s, data->sb);
2393 nfs_fscache_get_super_cookie(s, NULL, data);
2394 }
2395
2396 mntroot = nfs_get_root(s, data->fh, dev_name);
2397 if (IS_ERR(mntroot)) {
2398 error = PTR_ERR(mntroot);
2399 goto error_splat_super;
2400 }
2401 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2402 dput(mntroot);
2403 error = -ESTALE;
2404 goto error_splat_super;
2405 }
2406
2407 s->s_flags |= MS_ACTIVE;
2408
2409 /* clone any lsm security options from the parent to the new sb */
2410 security_sb_clone_mnt_opts(data->sb, s);
2411
2412 dprintk("<-- nfs_xdev_mount() = 0\n");
2413 return mntroot;
2414
2415 out_err_nosb:
2416 nfs_free_server(server);
2417 out_err_noserver:
2418 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2419 return ERR_PTR(error);
2420
2421 error_splat_super:
2422 if (server && !s->s_root)
2423 bdi_unregister(&server->backing_dev_info);
2424 error_splat_bdi:
2425 deactivate_locked_super(s);
2426 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2427 return ERR_PTR(error);
2428 }
2429
2430 #ifdef CONFIG_NFS_V4
2431
2432 /*
2433 * Finish setting up a cloned NFS4 superblock
2434 */
2435 static void nfs4_clone_super(struct super_block *sb,
2436 const struct super_block *old_sb)
2437 {
2438 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2439 sb->s_blocksize = old_sb->s_blocksize;
2440 sb->s_maxbytes = old_sb->s_maxbytes;
2441 sb->s_time_gran = 1;
2442 sb->s_op = old_sb->s_op;
2443 /*
2444 * The VFS shouldn't apply the umask to mode bits. We will do
2445 * so ourselves when necessary.
2446 */
2447 sb->s_flags |= MS_POSIXACL;
2448 sb->s_xattr = old_sb->s_xattr;
2449 nfs_initialise_sb(sb);
2450 }
2451
2452 /*
2453 * Set up an NFS4 superblock
2454 */
2455 static void nfs4_fill_super(struct super_block *sb)
2456 {
2457 sb->s_time_gran = 1;
2458 sb->s_op = &nfs4_sops;
2459 /*
2460 * The VFS shouldn't apply the umask to mode bits. We will do
2461 * so ourselves when necessary.
2462 */
2463 sb->s_flags |= MS_POSIXACL;
2464 sb->s_xattr = nfs4_xattr_handlers;
2465 nfs_initialise_sb(sb);
2466 }
2467
2468 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2469 {
2470 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2471 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2472 }
2473
2474 static int nfs4_validate_text_mount_data(void *options,
2475 struct nfs_parsed_mount_data *args,
2476 const char *dev_name)
2477 {
2478 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2479
2480 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2481
2482 nfs_validate_transport_protocol(args);
2483
2484 nfs4_validate_mount_flags(args);
2485
2486 if (args->version != 4) {
2487 dfprintk(MOUNT,
2488 "NFS4: Illegal mount version\n");
2489 return -EINVAL;
2490 }
2491
2492 if (args->auth_flavor_len > 1) {
2493 dfprintk(MOUNT,
2494 "NFS4: Too many RPC auth flavours specified\n");
2495 return -EINVAL;
2496 }
2497
2498 if (args->client_address == NULL) {
2499 dfprintk(MOUNT,
2500 "NFS4: mount program didn't pass callback address\n");
2501 return -EINVAL;
2502 }
2503
2504 return nfs_parse_devname(dev_name,
2505 &args->nfs_server.hostname,
2506 NFS4_MAXNAMLEN,
2507 &args->nfs_server.export_path,
2508 NFS4_MAXPATHLEN);
2509 }
2510
2511 /*
2512 * Validate NFSv4 mount options
2513 */
2514 static int nfs4_validate_mount_data(void *options,
2515 struct nfs_parsed_mount_data *args,
2516 const char *dev_name)
2517 {
2518 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2519 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2520 char *c;
2521
2522 if (data == NULL)
2523 goto out_no_data;
2524
2525 switch (data->version) {
2526 case 1:
2527 if (data->host_addrlen > sizeof(args->nfs_server.address))
2528 goto out_no_address;
2529 if (data->host_addrlen == 0)
2530 goto out_no_address;
2531 args->nfs_server.addrlen = data->host_addrlen;
2532 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2533 return -EFAULT;
2534 if (!nfs_verify_server_address(sap))
2535 goto out_no_address;
2536
2537 if (data->auth_flavourlen) {
2538 if (data->auth_flavourlen > 1)
2539 goto out_inval_auth;
2540 if (copy_from_user(&args->auth_flavors[0],
2541 data->auth_flavours,
2542 sizeof(args->auth_flavors[0])))
2543 return -EFAULT;
2544 }
2545
2546 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2547 if (IS_ERR(c))
2548 return PTR_ERR(c);
2549 args->nfs_server.hostname = c;
2550
2551 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2552 if (IS_ERR(c))
2553 return PTR_ERR(c);
2554 args->nfs_server.export_path = c;
2555 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2556
2557 c = strndup_user(data->client_addr.data, 16);
2558 if (IS_ERR(c))
2559 return PTR_ERR(c);
2560 args->client_address = c;
2561
2562 /*
2563 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2564 * can deal with.
2565 */
2566
2567 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2568 args->rsize = data->rsize;
2569 args->wsize = data->wsize;
2570 args->timeo = data->timeo;
2571 args->retrans = data->retrans;
2572 args->acregmin = data->acregmin;
2573 args->acregmax = data->acregmax;
2574 args->acdirmin = data->acdirmin;
2575 args->acdirmax = data->acdirmax;
2576 args->nfs_server.protocol = data->proto;
2577 nfs_validate_transport_protocol(args);
2578
2579 break;
2580 default:
2581 if (nfs_parse_mount_options((char *)options, args) == 0)
2582 return -EINVAL;
2583
2584 if (!nfs_verify_server_address(sap))
2585 return -EINVAL;
2586
2587 return nfs4_validate_text_mount_data(options, args, dev_name);
2588 }
2589
2590 return 0;
2591
2592 out_no_data:
2593 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2594 return -EINVAL;
2595
2596 out_inval_auth:
2597 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2598 data->auth_flavourlen);
2599 return -EINVAL;
2600
2601 out_no_address:
2602 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2603 return -EINVAL;
2604 }
2605
2606 /*
2607 * Get the superblock for the NFS4 root partition
2608 */
2609 static struct dentry *
2610 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2611 const char *dev_name, void *raw_data)
2612 {
2613 struct nfs_parsed_mount_data *data = raw_data;
2614 struct super_block *s;
2615 struct nfs_server *server;
2616 struct nfs_fh *mntfh;
2617 struct dentry *mntroot;
2618 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2619 struct nfs_sb_mountdata sb_mntdata = {
2620 .mntflags = flags,
2621 };
2622 int error = -ENOMEM;
2623
2624 mntfh = nfs_alloc_fhandle();
2625 if (data == NULL || mntfh == NULL)
2626 goto out_free_fh;
2627
2628 security_init_mnt_opts(&data->lsm_opts);
2629
2630 /* Get a volume representation */
2631 server = nfs4_create_server(data, mntfh);
2632 if (IS_ERR(server)) {
2633 error = PTR_ERR(server);
2634 goto out;
2635 }
2636 sb_mntdata.server = server;
2637
2638 if (server->flags & NFS4_MOUNT_UNSHARED)
2639 compare_super = NULL;
2640
2641 /* -o noac implies -o sync */
2642 if (server->flags & NFS_MOUNT_NOAC)
2643 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2644
2645 /* Get a superblock - note that we may end up sharing one that already exists */
2646 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2647 if (IS_ERR(s)) {
2648 error = PTR_ERR(s);
2649 goto out_free;
2650 }
2651
2652 if (s->s_fs_info != server) {
2653 nfs_free_server(server);
2654 server = NULL;
2655 } else {
2656 error = nfs_bdi_register(server);
2657 if (error)
2658 goto error_splat_bdi;
2659 }
2660
2661 if (!s->s_root) {
2662 /* initial superblock/root creation */
2663 nfs4_fill_super(s);
2664 nfs_fscache_get_super_cookie(
2665 s, data ? data->fscache_uniq : NULL, NULL);
2666 }
2667
2668 mntroot = nfs4_get_root(s, mntfh, dev_name);
2669 if (IS_ERR(mntroot)) {
2670 error = PTR_ERR(mntroot);
2671 goto error_splat_super;
2672 }
2673
2674 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2675 if (error)
2676 goto error_splat_root;
2677
2678 s->s_flags |= MS_ACTIVE;
2679
2680 security_free_mnt_opts(&data->lsm_opts);
2681 nfs_free_fhandle(mntfh);
2682 return mntroot;
2683
2684 out:
2685 security_free_mnt_opts(&data->lsm_opts);
2686 out_free_fh:
2687 nfs_free_fhandle(mntfh);
2688 return ERR_PTR(error);
2689
2690 out_free:
2691 nfs_free_server(server);
2692 goto out;
2693
2694 error_splat_root:
2695 dput(mntroot);
2696 error_splat_super:
2697 if (server && !s->s_root)
2698 bdi_unregister(&server->backing_dev_info);
2699 error_splat_bdi:
2700 deactivate_locked_super(s);
2701 goto out;
2702 }
2703
2704 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2705 int flags, void *data, const char *hostname)
2706 {
2707 struct vfsmount *root_mnt;
2708 char *root_devname;
2709 size_t len;
2710
2711 len = strlen(hostname) + 3;
2712 root_devname = kmalloc(len, GFP_KERNEL);
2713 if (root_devname == NULL)
2714 return ERR_PTR(-ENOMEM);
2715 snprintf(root_devname, len, "%s:/", hostname);
2716 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2717 kfree(root_devname);
2718 return root_mnt;
2719 }
2720
2721 struct nfs_referral_count {
2722 struct list_head list;
2723 const struct task_struct *task;
2724 unsigned int referral_count;
2725 };
2726
2727 static LIST_HEAD(nfs_referral_count_list);
2728 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2729
2730 static struct nfs_referral_count *nfs_find_referral_count(void)
2731 {
2732 struct nfs_referral_count *p;
2733
2734 list_for_each_entry(p, &nfs_referral_count_list, list) {
2735 if (p->task == current)
2736 return p;
2737 }
2738 return NULL;
2739 }
2740
2741 #define NFS_MAX_NESTED_REFERRALS 2
2742
2743 static int nfs_referral_loop_protect(void)
2744 {
2745 struct nfs_referral_count *p, *new;
2746 int ret = -ENOMEM;
2747
2748 new = kmalloc(sizeof(*new), GFP_KERNEL);
2749 if (!new)
2750 goto out;
2751 new->task = current;
2752 new->referral_count = 1;
2753
2754 ret = 0;
2755 spin_lock(&nfs_referral_count_list_lock);
2756 p = nfs_find_referral_count();
2757 if (p != NULL) {
2758 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2759 ret = -ELOOP;
2760 else
2761 p->referral_count++;
2762 } else {
2763 list_add(&new->list, &nfs_referral_count_list);
2764 new = NULL;
2765 }
2766 spin_unlock(&nfs_referral_count_list_lock);
2767 kfree(new);
2768 out:
2769 return ret;
2770 }
2771
2772 static void nfs_referral_loop_unprotect(void)
2773 {
2774 struct nfs_referral_count *p;
2775
2776 spin_lock(&nfs_referral_count_list_lock);
2777 p = nfs_find_referral_count();
2778 p->referral_count--;
2779 if (p->referral_count == 0)
2780 list_del(&p->list);
2781 else
2782 p = NULL;
2783 spin_unlock(&nfs_referral_count_list_lock);
2784 kfree(p);
2785 }
2786
2787 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2788 const char *export_path)
2789 {
2790 struct mnt_namespace *ns_private;
2791 struct super_block *s;
2792 struct dentry *dentry;
2793 struct path path;
2794 int ret;
2795
2796 ns_private = create_mnt_ns(root_mnt);
2797 ret = PTR_ERR(ns_private);
2798 if (IS_ERR(ns_private))
2799 goto out_mntput;
2800
2801 ret = nfs_referral_loop_protect();
2802 if (ret != 0)
2803 goto out_put_mnt_ns;
2804
2805 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2806 export_path, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &path);
2807
2808 nfs_referral_loop_unprotect();
2809 put_mnt_ns(ns_private);
2810
2811 if (ret != 0)
2812 goto out_err;
2813
2814 s = path.mnt->mnt_sb;
2815 atomic_inc(&s->s_active);
2816 dentry = dget(path.dentry);
2817
2818 path_put(&path);
2819 down_write(&s->s_umount);
2820 return dentry;
2821 out_put_mnt_ns:
2822 put_mnt_ns(ns_private);
2823 out_mntput:
2824 mntput(root_mnt);
2825 out_err:
2826 return ERR_PTR(ret);
2827 }
2828
2829 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2830 struct nfs_parsed_mount_data *data)
2831 {
2832 char *export_path;
2833 struct vfsmount *root_mnt;
2834 struct dentry *res;
2835
2836 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2837
2838 export_path = data->nfs_server.export_path;
2839 data->nfs_server.export_path = "/";
2840 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2841 data->nfs_server.hostname);
2842 data->nfs_server.export_path = export_path;
2843
2844 res = ERR_CAST(root_mnt);
2845 if (!IS_ERR(root_mnt))
2846 res = nfs_follow_remote_path(root_mnt, export_path);
2847
2848 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2849 IS_ERR(res) ? PTR_ERR(res) : 0,
2850 IS_ERR(res) ? " [error]" : "");
2851 return res;
2852 }
2853
2854 /*
2855 * Get the superblock for an NFS4 mountpoint
2856 */
2857 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2858 int flags, const char *dev_name, void *raw_data)
2859 {
2860 struct nfs_parsed_mount_data *data;
2861 int error = -ENOMEM;
2862 struct dentry *res = ERR_PTR(-ENOMEM);
2863
2864 data = nfs_alloc_parsed_mount_data(4);
2865 if (data == NULL)
2866 goto out_free_data;
2867
2868 /* Validate the mount data */
2869 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2870 if (error < 0) {
2871 res = ERR_PTR(error);
2872 goto out;
2873 }
2874
2875 res = nfs4_try_mount(flags, dev_name, data);
2876 if (IS_ERR(res))
2877 error = PTR_ERR(res);
2878
2879 out:
2880 kfree(data->client_address);
2881 kfree(data->nfs_server.export_path);
2882 kfree(data->nfs_server.hostname);
2883 kfree(data->fscache_uniq);
2884 out_free_data:
2885 kfree(data);
2886 dprintk("<-- nfs4_mount() = %d%s\n", error,
2887 error != 0 ? " [error]" : "");
2888 return res;
2889 }
2890
2891 static void nfs4_kill_super(struct super_block *sb)
2892 {
2893 struct nfs_server *server = NFS_SB(sb);
2894
2895 dprintk("--> %s\n", __func__);
2896 nfs_super_return_all_delegations(sb);
2897 kill_anon_super(sb);
2898 nfs_fscache_release_super_cookie(sb);
2899 nfs_free_server(server);
2900 dprintk("<-- %s\n", __func__);
2901 }
2902
2903 /*
2904 * Clone an NFS4 server record on xdev traversal (FSID-change)
2905 */
2906 static struct dentry *
2907 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2908 const char *dev_name, void *raw_data)
2909 {
2910 struct nfs_clone_mount *data = raw_data;
2911 struct super_block *s;
2912 struct nfs_server *server;
2913 struct dentry *mntroot;
2914 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2915 struct nfs_sb_mountdata sb_mntdata = {
2916 .mntflags = flags,
2917 };
2918 int error;
2919
2920 dprintk("--> nfs4_xdev_mount()\n");
2921
2922 /* create a new volume representation */
2923 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2924 if (IS_ERR(server)) {
2925 error = PTR_ERR(server);
2926 goto out_err_noserver;
2927 }
2928 sb_mntdata.server = server;
2929
2930 if (server->flags & NFS4_MOUNT_UNSHARED)
2931 compare_super = NULL;
2932
2933 /* -o noac implies -o sync */
2934 if (server->flags & NFS_MOUNT_NOAC)
2935 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2936
2937 /* Get a superblock - note that we may end up sharing one that already exists */
2938 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2939 if (IS_ERR(s)) {
2940 error = PTR_ERR(s);
2941 goto out_err_nosb;
2942 }
2943
2944 if (s->s_fs_info != server) {
2945 nfs_free_server(server);
2946 server = NULL;
2947 } else {
2948 error = nfs_bdi_register(server);
2949 if (error)
2950 goto error_splat_bdi;
2951 }
2952
2953 if (!s->s_root) {
2954 /* initial superblock/root creation */
2955 nfs4_clone_super(s, data->sb);
2956 nfs_fscache_get_super_cookie(s, NULL, data);
2957 }
2958
2959 mntroot = nfs4_get_root(s, data->fh, dev_name);
2960 if (IS_ERR(mntroot)) {
2961 error = PTR_ERR(mntroot);
2962 goto error_splat_super;
2963 }
2964 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2965 dput(mntroot);
2966 error = -ESTALE;
2967 goto error_splat_super;
2968 }
2969
2970 s->s_flags |= MS_ACTIVE;
2971
2972 security_sb_clone_mnt_opts(data->sb, s);
2973
2974 dprintk("<-- nfs4_xdev_mount() = 0\n");
2975 return mntroot;
2976
2977 out_err_nosb:
2978 nfs_free_server(server);
2979 out_err_noserver:
2980 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2981 return ERR_PTR(error);
2982
2983 error_splat_super:
2984 if (server && !s->s_root)
2985 bdi_unregister(&server->backing_dev_info);
2986 error_splat_bdi:
2987 deactivate_locked_super(s);
2988 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2989 return ERR_PTR(error);
2990 }
2991
2992 static struct dentry *
2993 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2994 const char *dev_name, void *raw_data)
2995 {
2996 struct nfs_clone_mount *data = raw_data;
2997 struct super_block *s;
2998 struct nfs_server *server;
2999 struct dentry *mntroot;
3000 struct nfs_fh *mntfh;
3001 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3002 struct nfs_sb_mountdata sb_mntdata = {
3003 .mntflags = flags,
3004 };
3005 int error = -ENOMEM;
3006
3007 dprintk("--> nfs4_referral_get_sb()\n");
3008
3009 mntfh = nfs_alloc_fhandle();
3010 if (mntfh == NULL)
3011 goto out_err_nofh;
3012
3013 /* create a new volume representation */
3014 server = nfs4_create_referral_server(data, mntfh);
3015 if (IS_ERR(server)) {
3016 error = PTR_ERR(server);
3017 goto out_err_noserver;
3018 }
3019 sb_mntdata.server = server;
3020
3021 if (server->flags & NFS4_MOUNT_UNSHARED)
3022 compare_super = NULL;
3023
3024 /* -o noac implies -o sync */
3025 if (server->flags & NFS_MOUNT_NOAC)
3026 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3027
3028 /* Get a superblock - note that we may end up sharing one that already exists */
3029 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3030 if (IS_ERR(s)) {
3031 error = PTR_ERR(s);
3032 goto out_err_nosb;
3033 }
3034
3035 if (s->s_fs_info != server) {
3036 nfs_free_server(server);
3037 server = NULL;
3038 } else {
3039 error = nfs_bdi_register(server);
3040 if (error)
3041 goto error_splat_bdi;
3042 }
3043
3044 if (!s->s_root) {
3045 /* initial superblock/root creation */
3046 nfs4_fill_super(s);
3047 nfs_fscache_get_super_cookie(s, NULL, data);
3048 }
3049
3050 mntroot = nfs4_get_root(s, mntfh, dev_name);
3051 if (IS_ERR(mntroot)) {
3052 error = PTR_ERR(mntroot);
3053 goto error_splat_super;
3054 }
3055 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3056 dput(mntroot);
3057 error = -ESTALE;
3058 goto error_splat_super;
3059 }
3060
3061 s->s_flags |= MS_ACTIVE;
3062
3063 security_sb_clone_mnt_opts(data->sb, s);
3064
3065 nfs_free_fhandle(mntfh);
3066 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3067 return mntroot;
3068
3069 out_err_nosb:
3070 nfs_free_server(server);
3071 out_err_noserver:
3072 nfs_free_fhandle(mntfh);
3073 out_err_nofh:
3074 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3075 return ERR_PTR(error);
3076
3077 error_splat_super:
3078 if (server && !s->s_root)
3079 bdi_unregister(&server->backing_dev_info);
3080 error_splat_bdi:
3081 deactivate_locked_super(s);
3082 nfs_free_fhandle(mntfh);
3083 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3084 return ERR_PTR(error);
3085 }
3086
3087 /*
3088 * Create an NFS4 server record on referral traversal
3089 */
3090 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3091 int flags, const char *dev_name, void *raw_data)
3092 {
3093 struct nfs_clone_mount *data = raw_data;
3094 char *export_path;
3095 struct vfsmount *root_mnt;
3096 struct dentry *res;
3097
3098 dprintk("--> nfs4_referral_mount()\n");
3099
3100 export_path = data->mnt_path;
3101 data->mnt_path = "/";
3102
3103 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3104 flags, data, data->hostname);
3105 data->mnt_path = export_path;
3106
3107 res = ERR_CAST(root_mnt);
3108 if (!IS_ERR(root_mnt))
3109 res = nfs_follow_remote_path(root_mnt, export_path);
3110 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3111 IS_ERR(res) ? PTR_ERR(res) : 0,
3112 IS_ERR(res) ? " [error]" : "");
3113 return res;
3114 }
3115
3116 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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