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wl18xx: implement fw status debugfs entries
[linux-2.6/libata-dev.git] / fs / nfs / super.c
blobff656c022684e9e2b0d94587cf9d807d670bd715
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
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 #define NFS_TEXT_DATA 1
70
71 #ifdef CONFIG_NFS_V3
72 #define NFS_DEFAULT_VERSION 3
73 #else
74 #define NFS_DEFAULT_VERSION 2
75 #endif
76
77 enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
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_minorversion,
102
103 /* Mount options that take string arguments */
104 Opt_nfsvers,
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_udp, "udp" },
137 { Opt_tcp, "tcp" },
138 { Opt_rdma, "rdma" },
139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
147 { Opt_fscache, "fsc" },
148 { Opt_nofscache, "nofsc" },
149
150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
164 { Opt_minorversion, "minorversion=%s" },
165
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
174 { Opt_mounthost, "mounthost=%s" },
175 { Opt_mountaddr, "mountaddr=%s" },
176
177 { Opt_lookupcache, "lookupcache=%s" },
178 { Opt_fscache_uniq, "fsc=%s" },
179 { Opt_local_lock, "local_lock=%s" },
180
181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
184 { Opt_err, NULL }
185 };
186
187 enum {
188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
189
190 Opt_xprt_err
191 };
192
193 static const match_table_t nfs_xprt_protocol_tokens = {
194 { Opt_xprt_udp, "udp" },
195 { Opt_xprt_udp6, "udp6" },
196 { Opt_xprt_tcp, "tcp" },
197 { Opt_xprt_tcp6, "tcp6" },
198 { Opt_xprt_rdma, "rdma" },
199
200 { Opt_xprt_err, NULL }
201 };
202
203 enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210 };
211
212 static const match_table_t nfs_secflavor_tokens = {
213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
229 { Opt_sec_err, NULL }
230 };
231
232 enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237 };
238
239 static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246 };
247
248 enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253 };
254
255 static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262 };
263
264 enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269 };
270
271 static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279 };
280
281 struct nfs_mount_info {
282 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
284 struct nfs_parsed_mount_data *parsed;
285 struct nfs_clone_mount *cloned;
286 struct nfs_fh *mntfh;
287 };
288
289 static void nfs_umount_begin(struct super_block *);
290 static int nfs_statfs(struct dentry *, struct kstatfs *);
291 static int nfs_show_options(struct seq_file *, struct dentry *);
292 static int nfs_show_devname(struct seq_file *, struct dentry *);
293 static int nfs_show_path(struct seq_file *, struct dentry *);
294 static int nfs_show_stats(struct seq_file *, struct dentry *);
295 static struct dentry *nfs_fs_mount_common(struct file_system_type *,
296 struct nfs_server *, int, const char *, struct nfs_mount_info *);
297 static struct dentry *nfs_fs_mount(struct file_system_type *,
298 int, const char *, void *);
299 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
300 int flags, const char *dev_name, void *raw_data);
301 static void nfs_put_super(struct super_block *);
302 static void nfs_kill_super(struct super_block *);
303 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
304
305 static struct file_system_type nfs_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs",
308 .mount = nfs_fs_mount,
309 .kill_sb = nfs_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311 };
312
313 struct file_system_type nfs_xdev_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "nfs",
316 .mount = nfs_xdev_mount,
317 .kill_sb = nfs_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319 };
320
321 static const struct super_operations nfs_sops = {
322 .alloc_inode = nfs_alloc_inode,
323 .destroy_inode = nfs_destroy_inode,
324 .write_inode = nfs_write_inode,
325 .put_super = nfs_put_super,
326 .statfs = nfs_statfs,
327 .evict_inode = nfs_evict_inode,
328 .umount_begin = nfs_umount_begin,
329 .show_options = nfs_show_options,
330 .show_devname = nfs_show_devname,
331 .show_path = nfs_show_path,
332 .show_stats = nfs_show_stats,
333 .remount_fs = nfs_remount,
334 };
335
336 #ifdef CONFIG_NFS_V4
337 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
338 static int nfs4_validate_mount_data(void *options,
339 struct nfs_parsed_mount_data *args, const char *dev_name);
340 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
341 struct nfs_mount_info *mount_info);
342 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
344 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
346 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
348 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
350 static void nfs4_kill_super(struct super_block *sb);
351
352 static struct file_system_type nfs4_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
355 .mount = nfs_fs_mount,
356 .kill_sb = nfs4_kill_super,
357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
358 };
359
360 static struct file_system_type nfs4_remote_fs_type = {
361 .owner = THIS_MODULE,
362 .name = "nfs4",
363 .mount = nfs4_remote_mount,
364 .kill_sb = nfs4_kill_super,
365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
366 };
367
368 struct file_system_type nfs4_xdev_fs_type = {
369 .owner = THIS_MODULE,
370 .name = "nfs4",
371 .mount = nfs4_xdev_mount,
372 .kill_sb = nfs4_kill_super,
373 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
374 };
375
376 static struct file_system_type nfs4_remote_referral_fs_type = {
377 .owner = THIS_MODULE,
378 .name = "nfs4",
379 .mount = nfs4_remote_referral_mount,
380 .kill_sb = nfs4_kill_super,
381 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
382 };
383
384 struct file_system_type nfs4_referral_fs_type = {
385 .owner = THIS_MODULE,
386 .name = "nfs4",
387 .mount = nfs4_referral_mount,
388 .kill_sb = nfs4_kill_super,
389 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
390 };
391
392 static const struct super_operations nfs4_sops = {
393 .alloc_inode = nfs_alloc_inode,
394 .destroy_inode = nfs_destroy_inode,
395 .write_inode = nfs_write_inode,
396 .put_super = nfs_put_super,
397 .statfs = nfs_statfs,
398 .evict_inode = nfs4_evict_inode,
399 .umount_begin = nfs_umount_begin,
400 .show_options = nfs_show_options,
401 .show_devname = nfs_show_devname,
402 .show_path = nfs_show_path,
403 .show_stats = nfs_show_stats,
404 .remount_fs = nfs_remount,
405 };
406 #endif
407
408 static struct shrinker acl_shrinker = {
409 .shrink = nfs_access_cache_shrinker,
410 .seeks = DEFAULT_SEEKS,
411 };
412
413 /*
414 * Register the NFS filesystems
415 */
416 int __init register_nfs_fs(void)
417 {
418 int ret;
419
420 ret = register_filesystem(&nfs_fs_type);
421 if (ret < 0)
422 goto error_0;
423
424 ret = nfs_register_sysctl();
425 if (ret < 0)
426 goto error_1;
427 #ifdef CONFIG_NFS_V4
428 ret = register_filesystem(&nfs4_fs_type);
429 if (ret < 0)
430 goto error_2;
431 #endif
432 register_shrinker(&acl_shrinker);
433 return 0;
434
435 #ifdef CONFIG_NFS_V4
436 error_2:
437 nfs_unregister_sysctl();
438 #endif
439 error_1:
440 unregister_filesystem(&nfs_fs_type);
441 error_0:
442 return ret;
443 }
444
445 /*
446 * Unregister the NFS filesystems
447 */
448 void __exit unregister_nfs_fs(void)
449 {
450 unregister_shrinker(&acl_shrinker);
451 #ifdef CONFIG_NFS_V4
452 unregister_filesystem(&nfs4_fs_type);
453 #endif
454 nfs_unregister_sysctl();
455 unregister_filesystem(&nfs_fs_type);
456 }
457
458 void nfs_sb_active(struct super_block *sb)
459 {
460 struct nfs_server *server = NFS_SB(sb);
461
462 if (atomic_inc_return(&server->active) == 1)
463 atomic_inc(&sb->s_active);
464 }
465
466 void nfs_sb_deactive(struct super_block *sb)
467 {
468 struct nfs_server *server = NFS_SB(sb);
469
470 if (atomic_dec_and_test(&server->active))
471 deactivate_super(sb);
472 }
473
474 /*
475 * Deliver file system statistics to userspace
476 */
477 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
478 {
479 struct nfs_server *server = NFS_SB(dentry->d_sb);
480 unsigned char blockbits;
481 unsigned long blockres;
482 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
483 struct nfs_fsstat res;
484 int error = -ENOMEM;
485
486 res.fattr = nfs_alloc_fattr();
487 if (res.fattr == NULL)
488 goto out_err;
489
490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
491 if (unlikely(error == -ESTALE)) {
492 struct dentry *pd_dentry;
493
494 pd_dentry = dget_parent(dentry);
495 if (pd_dentry != NULL) {
496 nfs_zap_caches(pd_dentry->d_inode);
497 dput(pd_dentry);
498 }
499 }
500 nfs_free_fattr(res.fattr);
501 if (error < 0)
502 goto out_err;
503
504 buf->f_type = NFS_SUPER_MAGIC;
505
506 /*
507 * Current versions of glibc do not correctly handle the
508 * case where f_frsize != f_bsize. Eventually we want to
509 * report the value of wtmult in this field.
510 */
511 buf->f_frsize = dentry->d_sb->s_blocksize;
512
513 /*
514 * On most *nix systems, f_blocks, f_bfree, and f_bavail
515 * are reported in units of f_frsize. Linux hasn't had
516 * an f_frsize field in its statfs struct until recently,
517 * thus historically Linux's sys_statfs reports these
518 * fields in units of f_bsize.
519 */
520 buf->f_bsize = dentry->d_sb->s_blocksize;
521 blockbits = dentry->d_sb->s_blocksize_bits;
522 blockres = (1 << blockbits) - 1;
523 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
524 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
525 buf->f_bavail = (res.abytes + blockres) >> blockbits;
526
527 buf->f_files = res.tfiles;
528 buf->f_ffree = res.afiles;
529
530 buf->f_namelen = server->namelen;
531
532 return 0;
533
534 out_err:
535 dprintk("%s: statfs error = %d\n", __func__, -error);
536 return error;
537 }
538
539 /*
540 * Map the security flavour number to a name
541 */
542 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
543 {
544 static const struct {
545 rpc_authflavor_t flavour;
546 const char *str;
547 } sec_flavours[] = {
548 { RPC_AUTH_NULL, "null" },
549 { RPC_AUTH_UNIX, "sys" },
550 { RPC_AUTH_GSS_KRB5, "krb5" },
551 { RPC_AUTH_GSS_KRB5I, "krb5i" },
552 { RPC_AUTH_GSS_KRB5P, "krb5p" },
553 { RPC_AUTH_GSS_LKEY, "lkey" },
554 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
555 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
556 { RPC_AUTH_GSS_SPKM, "spkm" },
557 { RPC_AUTH_GSS_SPKMI, "spkmi" },
558 { RPC_AUTH_GSS_SPKMP, "spkmp" },
559 { UINT_MAX, "unknown" }
560 };
561 int i;
562
563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
564 if (sec_flavours[i].flavour == flavour)
565 break;
566 }
567 return sec_flavours[i].str;
568 }
569
570 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572 {
573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
574
575 seq_printf(m, ",mountproto=");
576 switch (sap->sa_family) {
577 case AF_INET:
578 switch (nfss->mountd_protocol) {
579 case IPPROTO_UDP:
580 seq_printf(m, RPCBIND_NETID_UDP);
581 break;
582 case IPPROTO_TCP:
583 seq_printf(m, RPCBIND_NETID_TCP);
584 break;
585 default:
586 if (showdefaults)
587 seq_printf(m, "auto");
588 }
589 break;
590 case AF_INET6:
591 switch (nfss->mountd_protocol) {
592 case IPPROTO_UDP:
593 seq_printf(m, RPCBIND_NETID_UDP6);
594 break;
595 case IPPROTO_TCP:
596 seq_printf(m, RPCBIND_NETID_TCP6);
597 break;
598 default:
599 if (showdefaults)
600 seq_printf(m, "auto");
601 }
602 break;
603 default:
604 if (showdefaults)
605 seq_printf(m, "auto");
606 }
607 }
608
609 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
610 int showdefaults)
611 {
612 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
613
614 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
615 return;
616
617 switch (sap->sa_family) {
618 case AF_INET: {
619 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
620 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
621 break;
622 }
623 case AF_INET6: {
624 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
625 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
626 break;
627 }
628 default:
629 if (showdefaults)
630 seq_printf(m, ",mountaddr=unspecified");
631 }
632
633 if (nfss->mountd_version || showdefaults)
634 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
635 if ((nfss->mountd_port &&
636 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
637 showdefaults)
638 seq_printf(m, ",mountport=%u", nfss->mountd_port);
639
640 nfs_show_mountd_netid(m, nfss, showdefaults);
641 }
642
643 #ifdef CONFIG_NFS_V4
644 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
645 int showdefaults)
646 {
647 struct nfs_client *clp = nfss->nfs_client;
648
649 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
650 }
651 #else
652 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
653 int showdefaults)
654 {
655 }
656 #endif
657
658 static void nfs_show_nfs_version(struct seq_file *m,
659 unsigned int version,
660 unsigned int minorversion)
661 {
662 seq_printf(m, ",vers=%u", version);
663 if (version == 4)
664 seq_printf(m, ".%u", minorversion);
665 }
666
667 /*
668 * Describe the mount options in force on this server representation
669 */
670 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
671 int showdefaults)
672 {
673 static const struct proc_nfs_info {
674 int flag;
675 const char *str;
676 const char *nostr;
677 } nfs_info[] = {
678 { NFS_MOUNT_SOFT, ",soft", ",hard" },
679 { NFS_MOUNT_POSIX, ",posix", "" },
680 { NFS_MOUNT_NOCTO, ",nocto", "" },
681 { NFS_MOUNT_NOAC, ",noac", "" },
682 { NFS_MOUNT_NONLM, ",nolock", "" },
683 { NFS_MOUNT_NOACL, ",noacl", "" },
684 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
685 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
686 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
687 { 0, NULL, NULL }
688 };
689 const struct proc_nfs_info *nfs_infop;
690 struct nfs_client *clp = nfss->nfs_client;
691 u32 version = clp->rpc_ops->version;
692 int local_flock, local_fcntl;
693
694 nfs_show_nfs_version(m, version, clp->cl_minorversion);
695 seq_printf(m, ",rsize=%u", nfss->rsize);
696 seq_printf(m, ",wsize=%u", nfss->wsize);
697 if (nfss->bsize != 0)
698 seq_printf(m, ",bsize=%u", nfss->bsize);
699 seq_printf(m, ",namlen=%u", nfss->namelen);
700 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
701 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
702 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
703 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
704 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
705 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
706 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
707 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
708 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
709 if (nfss->flags & nfs_infop->flag)
710 seq_puts(m, nfs_infop->str);
711 else
712 seq_puts(m, nfs_infop->nostr);
713 }
714 rcu_read_lock();
715 seq_printf(m, ",proto=%s",
716 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
717 rcu_read_unlock();
718 if (version == 4) {
719 if (nfss->port != NFS_PORT)
720 seq_printf(m, ",port=%u", nfss->port);
721 } else
722 if (nfss->port)
723 seq_printf(m, ",port=%u", nfss->port);
724
725 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
726 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
727 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
728
729 if (version != 4)
730 nfs_show_mountd_options(m, nfss, showdefaults);
731 else
732 nfs_show_nfsv4_options(m, nfss, showdefaults);
733
734 if (nfss->options & NFS_OPTION_FSCACHE)
735 seq_printf(m, ",fsc");
736
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
739 seq_printf(m, ",lookupcache=none");
740 else
741 seq_printf(m, ",lookupcache=pos");
742 }
743
744 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
745 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
746
747 if (!local_flock && !local_fcntl)
748 seq_printf(m, ",local_lock=none");
749 else if (local_flock && local_fcntl)
750 seq_printf(m, ",local_lock=all");
751 else if (local_flock)
752 seq_printf(m, ",local_lock=flock");
753 else
754 seq_printf(m, ",local_lock=posix");
755 }
756
757 /*
758 * Describe the mount options on this VFS mountpoint
759 */
760 static int nfs_show_options(struct seq_file *m, struct dentry *root)
761 {
762 struct nfs_server *nfss = NFS_SB(root->d_sb);
763
764 nfs_show_mount_options(m, nfss, 0);
765
766 rcu_read_lock();
767 seq_printf(m, ",addr=%s",
768 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
769 RPC_DISPLAY_ADDR));
770 rcu_read_unlock();
771
772 return 0;
773 }
774
775 #ifdef CONFIG_NFS_V4
776 #ifdef CONFIG_NFS_V4_1
777 static void show_sessions(struct seq_file *m, struct nfs_server *server)
778 {
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781 }
782 #else
783 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784 #endif
785 #endif
786
787 #ifdef CONFIG_NFS_V4_1
788 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
789 {
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795 }
796
797 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798 {
799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806 }
807 #else
808 #ifdef CONFIG_NFS_V4
809 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810 {
811 }
812 #endif
813 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814 {
815 }
816 #endif
817
818 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
819 {
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
825 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832 }
833
834 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
835 {
836 seq_puts(m, "/");
837 return 0;
838 }
839
840 /*
841 * Present statistical information for this VFS mountpoint
842 */
843 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
844 {
845 int i, cpu;
846 struct nfs_server *nfss = NFS_SB(root->d_sb);
847 struct rpc_auth *auth = nfss->client->cl_auth;
848 struct nfs_iostats totals = { };
849
850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
851
852 /*
853 * Display all mount option settings
854 */
855 seq_printf(m, "\n\topts:\t");
856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
860 nfs_show_mount_options(m, nfss, 1);
861
862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
863
864 show_implementation_id(m, nfss);
865
866 seq_printf(m, "\n\tcaps:\t");
867 seq_printf(m, "caps=0x%x", nfss->caps);
868 seq_printf(m, ",wtmult=%u", nfss->wtmult);
869 seq_printf(m, ",dtsize=%u", nfss->dtsize);
870 seq_printf(m, ",bsize=%u", nfss->bsize);
871 seq_printf(m, ",namlen=%u", nfss->namelen);
872
873 #ifdef CONFIG_NFS_V4
874 if (nfss->nfs_client->rpc_ops->version == 4) {
875 seq_printf(m, "\n\tnfsv4:\t");
876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
879 show_sessions(m, nfss);
880 show_pnfs(m, nfss);
881 }
882 #endif
883
884 /*
885 * Display security flavor in effect for this mount
886 */
887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
888 if (auth->au_flavor)
889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
890
891 /*
892 * Display superblock I/O counters
893 */
894 for_each_possible_cpu(cpu) {
895 struct nfs_iostats *stats;
896
897 preempt_disable();
898 stats = per_cpu_ptr(nfss->io_stats, cpu);
899
900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
901 totals.events[i] += stats->events[i];
902 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
903 totals.bytes[i] += stats->bytes[i];
904 #ifdef CONFIG_NFS_FSCACHE
905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
906 totals.fscache[i] += stats->fscache[i];
907 #endif
908
909 preempt_enable();
910 }
911
912 seq_printf(m, "\n\tevents:\t");
913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
914 seq_printf(m, "%lu ", totals.events[i]);
915 seq_printf(m, "\n\tbytes:\t");
916 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
917 seq_printf(m, "%Lu ", totals.bytes[i]);
918 #ifdef CONFIG_NFS_FSCACHE
919 if (nfss->options & NFS_OPTION_FSCACHE) {
920 seq_printf(m, "\n\tfsc:\t");
921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
922 seq_printf(m, "%Lu ", totals.bytes[i]);
923 }
924 #endif
925 seq_printf(m, "\n");
926
927 rpc_print_iostats(m, nfss->client);
928
929 return 0;
930 }
931
932 /*
933 * Begin unmount by attempting to remove all automounted mountpoints we added
934 * in response to xdev traversals and referrals
935 */
936 static void nfs_umount_begin(struct super_block *sb)
937 {
938 struct nfs_server *server;
939 struct rpc_clnt *rpc;
940
941 server = NFS_SB(sb);
942 /* -EIO all pending I/O */
943 rpc = server->client_acl;
944 if (!IS_ERR(rpc))
945 rpc_killall_tasks(rpc);
946 rpc = server->client;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
949 }
950
951 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
952 {
953 struct nfs_parsed_mount_data *data;
954
955 data = kzalloc(sizeof(*data), GFP_KERNEL);
956 if (data) {
957 data->acregmin = NFS_DEF_ACREGMIN;
958 data->acregmax = NFS_DEF_ACREGMAX;
959 data->acdirmin = NFS_DEF_ACDIRMIN;
960 data->acdirmax = NFS_DEF_ACDIRMAX;
961 data->mount_server.port = NFS_UNSPEC_PORT;
962 data->nfs_server.port = NFS_UNSPEC_PORT;
963 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
964 data->auth_flavors[0] = RPC_AUTH_UNIX;
965 data->auth_flavor_len = 1;
966 data->minorversion = 0;
967 data->need_mount = true;
968 data->net = current->nsproxy->net_ns;
969 security_init_mnt_opts(&data->lsm_opts);
970 }
971 return data;
972 }
973
974 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
975 {
976 if (data) {
977 kfree(data->client_address);
978 kfree(data->mount_server.hostname);
979 kfree(data->nfs_server.export_path);
980 kfree(data->nfs_server.hostname);
981 kfree(data->fscache_uniq);
982 security_free_mnt_opts(&data->lsm_opts);
983 kfree(data);
984 }
985 }
986
987 /*
988 * Sanity-check a server address provided by the mount command.
989 *
990 * Address family must be initialized, and address must not be
991 * the ANY address for that family.
992 */
993 static int nfs_verify_server_address(struct sockaddr *addr)
994 {
995 switch (addr->sa_family) {
996 case AF_INET: {
997 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
998 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
999 }
1000 case AF_INET6: {
1001 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1002 return !ipv6_addr_any(sa);
1003 }
1004 }
1005
1006 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
1007 return 0;
1008 }
1009
1010 /*
1011 * Select between a default port value and a user-specified port value.
1012 * If a zero value is set, then autobind will be used.
1013 */
1014 static void nfs_set_port(struct sockaddr *sap, int *port,
1015 const unsigned short default_port)
1016 {
1017 if (*port == NFS_UNSPEC_PORT)
1018 *port = default_port;
1019
1020 rpc_set_port(sap, *port);
1021 }
1022
1023 /*
1024 * Sanity check the NFS transport protocol.
1025 *
1026 */
1027 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1028 {
1029 switch (mnt->nfs_server.protocol) {
1030 case XPRT_TRANSPORT_UDP:
1031 case XPRT_TRANSPORT_TCP:
1032 case XPRT_TRANSPORT_RDMA:
1033 break;
1034 default:
1035 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1036 }
1037 }
1038
1039 /*
1040 * For text based NFSv2/v3 mounts, the mount protocol transport default
1041 * settings should depend upon the specified NFS transport.
1042 */
1043 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1044 {
1045 nfs_validate_transport_protocol(mnt);
1046
1047 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1048 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1049 return;
1050 switch (mnt->nfs_server.protocol) {
1051 case XPRT_TRANSPORT_UDP:
1052 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1053 break;
1054 case XPRT_TRANSPORT_TCP:
1055 case XPRT_TRANSPORT_RDMA:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1057 }
1058 }
1059
1060 /*
1061 * Parse the value of the 'sec=' option.
1062 */
1063 static int nfs_parse_security_flavors(char *value,
1064 struct nfs_parsed_mount_data *mnt)
1065 {
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1069
1070 switch (match_token(value, nfs_secflavor_tokens, args)) {
1071 case Opt_sec_none:
1072 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1073 break;
1074 case Opt_sec_sys:
1075 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1076 break;
1077 case Opt_sec_krb5:
1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1079 break;
1080 case Opt_sec_krb5i:
1081 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1082 break;
1083 case Opt_sec_krb5p:
1084 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1085 break;
1086 case Opt_sec_lkey:
1087 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1088 break;
1089 case Opt_sec_lkeyi:
1090 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1091 break;
1092 case Opt_sec_lkeyp:
1093 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1094 break;
1095 case Opt_sec_spkm:
1096 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1097 break;
1098 case Opt_sec_spkmi:
1099 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1100 break;
1101 case Opt_sec_spkmp:
1102 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1103 break;
1104 default:
1105 return 0;
1106 }
1107
1108 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1109 mnt->auth_flavor_len = 1;
1110 return 1;
1111 }
1112
1113 static int nfs_parse_version_string(char *string,
1114 struct nfs_parsed_mount_data *mnt,
1115 substring_t *args)
1116 {
1117 mnt->flags &= ~NFS_MOUNT_VER3;
1118 switch (match_token(string, nfs_vers_tokens, args)) {
1119 case Opt_vers_2:
1120 mnt->version = 2;
1121 break;
1122 case Opt_vers_3:
1123 mnt->flags |= NFS_MOUNT_VER3;
1124 mnt->version = 3;
1125 break;
1126 case Opt_vers_4:
1127 /* Backward compatibility option. In future,
1128 * the mount program should always supply
1129 * a NFSv4 minor version number.
1130 */
1131 mnt->version = 4;
1132 break;
1133 case Opt_vers_4_0:
1134 mnt->version = 4;
1135 mnt->minorversion = 0;
1136 break;
1137 case Opt_vers_4_1:
1138 mnt->version = 4;
1139 mnt->minorversion = 1;
1140 break;
1141 default:
1142 return 0;
1143 }
1144 return 1;
1145 }
1146
1147 static int nfs_get_option_str(substring_t args[], char **option)
1148 {
1149 kfree(*option);
1150 *option = match_strdup(args);
1151 return !option;
1152 }
1153
1154 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1155 {
1156 int rc;
1157 char *string;
1158
1159 string = match_strdup(args);
1160 if (string == NULL)
1161 return -ENOMEM;
1162 rc = strict_strtoul(string, 10, option);
1163 kfree(string);
1164
1165 return rc;
1166 }
1167
1168 /*
1169 * Error-check and convert a string of mount options from user space into
1170 * a data structure. The whole mount string is processed; bad options are
1171 * skipped as they are encountered. If there were no errors, return 1;
1172 * otherwise return 0 (zero).
1173 */
1174 static int nfs_parse_mount_options(char *raw,
1175 struct nfs_parsed_mount_data *mnt)
1176 {
1177 char *p, *string, *secdata;
1178 int rc, sloppy = 0, invalid_option = 0;
1179 unsigned short protofamily = AF_UNSPEC;
1180 unsigned short mountfamily = AF_UNSPEC;
1181
1182 if (!raw) {
1183 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1184 return 1;
1185 }
1186 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1187
1188 secdata = alloc_secdata();
1189 if (!secdata)
1190 goto out_nomem;
1191
1192 rc = security_sb_copy_data(raw, secdata);
1193 if (rc)
1194 goto out_security_failure;
1195
1196 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1197 if (rc)
1198 goto out_security_failure;
1199
1200 free_secdata(secdata);
1201
1202 while ((p = strsep(&raw, ",")) != NULL) {
1203 substring_t args[MAX_OPT_ARGS];
1204 unsigned long option;
1205 int token;
1206
1207 if (!*p)
1208 continue;
1209
1210 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1211
1212 token = match_token(p, nfs_mount_option_tokens, args);
1213 switch (token) {
1214
1215 /*
1216 * boolean options: foo/nofoo
1217 */
1218 case Opt_soft:
1219 mnt->flags |= NFS_MOUNT_SOFT;
1220 break;
1221 case Opt_hard:
1222 mnt->flags &= ~NFS_MOUNT_SOFT;
1223 break;
1224 case Opt_posix:
1225 mnt->flags |= NFS_MOUNT_POSIX;
1226 break;
1227 case Opt_noposix:
1228 mnt->flags &= ~NFS_MOUNT_POSIX;
1229 break;
1230 case Opt_cto:
1231 mnt->flags &= ~NFS_MOUNT_NOCTO;
1232 break;
1233 case Opt_nocto:
1234 mnt->flags |= NFS_MOUNT_NOCTO;
1235 break;
1236 case Opt_ac:
1237 mnt->flags &= ~NFS_MOUNT_NOAC;
1238 break;
1239 case Opt_noac:
1240 mnt->flags |= NFS_MOUNT_NOAC;
1241 break;
1242 case Opt_lock:
1243 mnt->flags &= ~NFS_MOUNT_NONLM;
1244 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1245 NFS_MOUNT_LOCAL_FCNTL);
1246 break;
1247 case Opt_nolock:
1248 mnt->flags |= NFS_MOUNT_NONLM;
1249 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1250 NFS_MOUNT_LOCAL_FCNTL);
1251 break;
1252 case Opt_udp:
1253 mnt->flags &= ~NFS_MOUNT_TCP;
1254 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1255 break;
1256 case Opt_tcp:
1257 mnt->flags |= NFS_MOUNT_TCP;
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1259 break;
1260 case Opt_rdma:
1261 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1263 xprt_load_transport(p);
1264 break;
1265 case Opt_acl:
1266 mnt->flags &= ~NFS_MOUNT_NOACL;
1267 break;
1268 case Opt_noacl:
1269 mnt->flags |= NFS_MOUNT_NOACL;
1270 break;
1271 case Opt_rdirplus:
1272 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1273 break;
1274 case Opt_nordirplus:
1275 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1276 break;
1277 case Opt_sharecache:
1278 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1279 break;
1280 case Opt_nosharecache:
1281 mnt->flags |= NFS_MOUNT_UNSHARED;
1282 break;
1283 case Opt_resvport:
1284 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1285 break;
1286 case Opt_noresvport:
1287 mnt->flags |= NFS_MOUNT_NORESVPORT;
1288 break;
1289 case Opt_fscache:
1290 mnt->options |= NFS_OPTION_FSCACHE;
1291 kfree(mnt->fscache_uniq);
1292 mnt->fscache_uniq = NULL;
1293 break;
1294 case Opt_nofscache:
1295 mnt->options &= ~NFS_OPTION_FSCACHE;
1296 kfree(mnt->fscache_uniq);
1297 mnt->fscache_uniq = NULL;
1298 break;
1299
1300 /*
1301 * options that take numeric values
1302 */
1303 case Opt_port:
1304 if (nfs_get_option_ul(args, &option) ||
1305 option > USHRT_MAX)
1306 goto out_invalid_value;
1307 mnt->nfs_server.port = option;
1308 break;
1309 case Opt_rsize:
1310 if (nfs_get_option_ul(args, &option))
1311 goto out_invalid_value;
1312 mnt->rsize = option;
1313 break;
1314 case Opt_wsize:
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 mnt->wsize = option;
1318 break;
1319 case Opt_bsize:
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->bsize = option;
1323 break;
1324 case Opt_timeo:
1325 if (nfs_get_option_ul(args, &option) || option == 0)
1326 goto out_invalid_value;
1327 mnt->timeo = option;
1328 break;
1329 case Opt_retrans:
1330 if (nfs_get_option_ul(args, &option) || option == 0)
1331 goto out_invalid_value;
1332 mnt->retrans = option;
1333 break;
1334 case Opt_acregmin:
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->acregmin = option;
1338 break;
1339 case Opt_acregmax:
1340 if (nfs_get_option_ul(args, &option))
1341 goto out_invalid_value;
1342 mnt->acregmax = option;
1343 break;
1344 case Opt_acdirmin:
1345 if (nfs_get_option_ul(args, &option))
1346 goto out_invalid_value;
1347 mnt->acdirmin = option;
1348 break;
1349 case Opt_acdirmax:
1350 if (nfs_get_option_ul(args, &option))
1351 goto out_invalid_value;
1352 mnt->acdirmax = option;
1353 break;
1354 case Opt_actimeo:
1355 if (nfs_get_option_ul(args, &option))
1356 goto out_invalid_value;
1357 mnt->acregmin = mnt->acregmax =
1358 mnt->acdirmin = mnt->acdirmax = option;
1359 break;
1360 case Opt_namelen:
1361 if (nfs_get_option_ul(args, &option))
1362 goto out_invalid_value;
1363 mnt->namlen = option;
1364 break;
1365 case Opt_mountport:
1366 if (nfs_get_option_ul(args, &option) ||
1367 option > USHRT_MAX)
1368 goto out_invalid_value;
1369 mnt->mount_server.port = option;
1370 break;
1371 case Opt_mountvers:
1372 if (nfs_get_option_ul(args, &option) ||
1373 option < NFS_MNT_VERSION ||
1374 option > NFS_MNT3_VERSION)
1375 goto out_invalid_value;
1376 mnt->mount_server.version = option;
1377 break;
1378 case Opt_minorversion:
1379 if (nfs_get_option_ul(args, &option))
1380 goto out_invalid_value;
1381 if (option > NFS4_MAX_MINOR_VERSION)
1382 goto out_invalid_value;
1383 mnt->minorversion = option;
1384 break;
1385
1386 /*
1387 * options that take text values
1388 */
1389 case Opt_nfsvers:
1390 string = match_strdup(args);
1391 if (string == NULL)
1392 goto out_nomem;
1393 rc = nfs_parse_version_string(string, mnt, args);
1394 kfree(string);
1395 if (!rc)
1396 goto out_invalid_value;
1397 break;
1398 case Opt_sec:
1399 string = match_strdup(args);
1400 if (string == NULL)
1401 goto out_nomem;
1402 rc = nfs_parse_security_flavors(string, mnt);
1403 kfree(string);
1404 if (!rc) {
1405 dfprintk(MOUNT, "NFS: unrecognized "
1406 "security flavor\n");
1407 return 0;
1408 }
1409 break;
1410 case Opt_proto:
1411 string = match_strdup(args);
1412 if (string == NULL)
1413 goto out_nomem;
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
1416
1417 protofamily = AF_INET;
1418 switch (token) {
1419 case Opt_xprt_udp6:
1420 protofamily = AF_INET6;
1421 case Opt_xprt_udp:
1422 mnt->flags &= ~NFS_MOUNT_TCP;
1423 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1424 break;
1425 case Opt_xprt_tcp6:
1426 protofamily = AF_INET6;
1427 case Opt_xprt_tcp:
1428 mnt->flags |= NFS_MOUNT_TCP;
1429 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1430 break;
1431 case Opt_xprt_rdma:
1432 /* vector side protocols to TCP */
1433 mnt->flags |= NFS_MOUNT_TCP;
1434 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1435 xprt_load_transport(string);
1436 break;
1437 default:
1438 dfprintk(MOUNT, "NFS: unrecognized "
1439 "transport protocol\n");
1440 kfree(string);
1441 return 0;
1442 }
1443 kfree(string);
1444 break;
1445 case Opt_mountproto:
1446 string = match_strdup(args);
1447 if (string == NULL)
1448 goto out_nomem;
1449 token = match_token(string,
1450 nfs_xprt_protocol_tokens, args);
1451 kfree(string);
1452
1453 mountfamily = AF_INET;
1454 switch (token) {
1455 case Opt_xprt_udp6:
1456 mountfamily = AF_INET6;
1457 case Opt_xprt_udp:
1458 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1459 break;
1460 case Opt_xprt_tcp6:
1461 mountfamily = AF_INET6;
1462 case Opt_xprt_tcp:
1463 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1464 break;
1465 case Opt_xprt_rdma: /* not used for side protocols */
1466 default:
1467 dfprintk(MOUNT, "NFS: unrecognized "
1468 "transport protocol\n");
1469 return 0;
1470 }
1471 break;
1472 case Opt_addr:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
1476 mnt->nfs_server.addrlen =
1477 rpc_pton(mnt->net, string, strlen(string),
1478 (struct sockaddr *)
1479 &mnt->nfs_server.address,
1480 sizeof(mnt->nfs_server.address));
1481 kfree(string);
1482 if (mnt->nfs_server.addrlen == 0)
1483 goto out_invalid_address;
1484 break;
1485 case Opt_clientaddr:
1486 if (nfs_get_option_str(args, &mnt->client_address))
1487 goto out_nomem;
1488 break;
1489 case Opt_mounthost:
1490 if (nfs_get_option_str(args,
1491 &mnt->mount_server.hostname))
1492 goto out_nomem;
1493 break;
1494 case Opt_mountaddr:
1495 string = match_strdup(args);
1496 if (string == NULL)
1497 goto out_nomem;
1498 mnt->mount_server.addrlen =
1499 rpc_pton(mnt->net, string, strlen(string),
1500 (struct sockaddr *)
1501 &mnt->mount_server.address,
1502 sizeof(mnt->mount_server.address));
1503 kfree(string);
1504 if (mnt->mount_server.addrlen == 0)
1505 goto out_invalid_address;
1506 break;
1507 case Opt_lookupcache:
1508 string = match_strdup(args);
1509 if (string == NULL)
1510 goto out_nomem;
1511 token = match_token(string,
1512 nfs_lookupcache_tokens, args);
1513 kfree(string);
1514 switch (token) {
1515 case Opt_lookupcache_all:
1516 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1517 break;
1518 case Opt_lookupcache_positive:
1519 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1520 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1521 break;
1522 case Opt_lookupcache_none:
1523 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1524 break;
1525 default:
1526 dfprintk(MOUNT, "NFS: invalid "
1527 "lookupcache argument\n");
1528 return 0;
1529 };
1530 break;
1531 case Opt_fscache_uniq:
1532 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1533 goto out_nomem;
1534 mnt->options |= NFS_OPTION_FSCACHE;
1535 break;
1536 case Opt_local_lock:
1537 string = match_strdup(args);
1538 if (string == NULL)
1539 goto out_nomem;
1540 token = match_token(string, nfs_local_lock_tokens,
1541 args);
1542 kfree(string);
1543 switch (token) {
1544 case Opt_local_lock_all:
1545 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1546 NFS_MOUNT_LOCAL_FCNTL);
1547 break;
1548 case Opt_local_lock_flock:
1549 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1550 break;
1551 case Opt_local_lock_posix:
1552 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1553 break;
1554 case Opt_local_lock_none:
1555 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1557 break;
1558 default:
1559 dfprintk(MOUNT, "NFS: invalid "
1560 "local_lock argument\n");
1561 return 0;
1562 };
1563 break;
1564
1565 /*
1566 * Special options
1567 */
1568 case Opt_sloppy:
1569 sloppy = 1;
1570 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1571 break;
1572 case Opt_userspace:
1573 case Opt_deprecated:
1574 dfprintk(MOUNT, "NFS: ignoring mount option "
1575 "'%s'\n", p);
1576 break;
1577
1578 default:
1579 invalid_option = 1;
1580 dfprintk(MOUNT, "NFS: unrecognized mount option "
1581 "'%s'\n", p);
1582 }
1583 }
1584
1585 if (!sloppy && invalid_option)
1586 return 0;
1587
1588 if (mnt->minorversion && mnt->version != 4)
1589 goto out_minorversion_mismatch;
1590
1591 /*
1592 * verify that any proto=/mountproto= options match the address
1593 * familiies in the addr=/mountaddr= options.
1594 */
1595 if (protofamily != AF_UNSPEC &&
1596 protofamily != mnt->nfs_server.address.ss_family)
1597 goto out_proto_mismatch;
1598
1599 if (mountfamily != AF_UNSPEC) {
1600 if (mnt->mount_server.addrlen) {
1601 if (mountfamily != mnt->mount_server.address.ss_family)
1602 goto out_mountproto_mismatch;
1603 } else {
1604 if (mountfamily != mnt->nfs_server.address.ss_family)
1605 goto out_mountproto_mismatch;
1606 }
1607 }
1608
1609 return 1;
1610
1611 out_mountproto_mismatch:
1612 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1613 "option\n");
1614 return 0;
1615 out_proto_mismatch:
1616 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1617 return 0;
1618 out_invalid_address:
1619 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1620 return 0;
1621 out_invalid_value:
1622 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1623 return 0;
1624 out_minorversion_mismatch:
1625 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1626 "minorversion=%u\n", mnt->version, mnt->minorversion);
1627 return 0;
1628 out_nomem:
1629 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1630 return 0;
1631 out_security_failure:
1632 free_secdata(secdata);
1633 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1634 return 0;
1635 }
1636
1637 /*
1638 * Match the requested auth flavors with the list returned by
1639 * the server. Returns zero and sets the mount's authentication
1640 * flavor on success; returns -EACCES if server does not support
1641 * the requested flavor.
1642 */
1643 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1644 struct nfs_mount_request *request)
1645 {
1646 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1647
1648 /*
1649 * Certain releases of Linux's mountd return an empty
1650 * flavor list. To prevent behavioral regression with
1651 * these servers (ie. rejecting mounts that used to
1652 * succeed), revert to pre-2.6.32 behavior (no checking)
1653 * if the returned flavor list is empty.
1654 */
1655 if (server_authlist_len == 0)
1656 return 0;
1657
1658 /*
1659 * We avoid sophisticated negotiating here, as there are
1660 * plenty of cases where we can get it wrong, providing
1661 * either too little or too much security.
1662 *
1663 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1664 * flavor listed first. However, some servers list
1665 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1666 * preferred default, in args->auth_flavors[0] if user
1667 * didn't specify sec= mount option.
1668 */
1669 for (i = 0; i < args->auth_flavor_len; i++)
1670 for (j = 0; j < server_authlist_len; j++)
1671 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1672 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1673 request->auth_flavs[j]);
1674 args->auth_flavors[0] = request->auth_flavs[j];
1675 return 0;
1676 }
1677
1678 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1679 nfs_umount(request);
1680 return -EACCES;
1681 }
1682
1683 /*
1684 * Use the remote server's MOUNT service to request the NFS file handle
1685 * corresponding to the provided path.
1686 */
1687 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1688 struct nfs_fh *root_fh)
1689 {
1690 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1691 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1692 struct nfs_mount_request request = {
1693 .sap = (struct sockaddr *)
1694 &args->mount_server.address,
1695 .dirpath = args->nfs_server.export_path,
1696 .protocol = args->mount_server.protocol,
1697 .fh = root_fh,
1698 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1699 .auth_flav_len = &server_authlist_len,
1700 .auth_flavs = server_authlist,
1701 .net = args->net,
1702 };
1703 int status;
1704
1705 if (args->mount_server.version == 0) {
1706 switch (args->version) {
1707 default:
1708 args->mount_server.version = NFS_MNT3_VERSION;
1709 break;
1710 case 2:
1711 args->mount_server.version = NFS_MNT_VERSION;
1712 }
1713 }
1714 request.version = args->mount_server.version;
1715
1716 if (args->mount_server.hostname)
1717 request.hostname = args->mount_server.hostname;
1718 else
1719 request.hostname = args->nfs_server.hostname;
1720
1721 /*
1722 * Construct the mount server's address.
1723 */
1724 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1725 memcpy(request.sap, &args->nfs_server.address,
1726 args->nfs_server.addrlen);
1727 args->mount_server.addrlen = args->nfs_server.addrlen;
1728 }
1729 request.salen = args->mount_server.addrlen;
1730 nfs_set_port(request.sap, &args->mount_server.port, 0);
1731
1732 /*
1733 * Now ask the mount server to map our export path
1734 * to a file handle.
1735 */
1736 status = nfs_mount(&request);
1737 if (status != 0) {
1738 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1739 request.hostname, status);
1740 return status;
1741 }
1742
1743 /*
1744 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1745 */
1746 if (args->mount_server.version != NFS_MNT3_VERSION)
1747 return 0;
1748 return nfs_walk_authlist(args, &request);
1749 }
1750
1751 static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1752 struct nfs_mount_info *mount_info)
1753 {
1754 int status;
1755 struct nfs_server *server;
1756
1757 if (mount_info->parsed->need_mount) {
1758 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
1759 if (status)
1760 return ERR_PTR(status);
1761 }
1762
1763 /* Get a volume representation */
1764 server = nfs_create_server(mount_info->parsed, mount_info->mntfh);
1765 if (IS_ERR(server))
1766 return ERR_CAST(server);
1767
1768 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info);
1769 }
1770
1771 /*
1772 * Split "dev_name" into "hostname:export_path".
1773 *
1774 * The leftmost colon demarks the split between the server's hostname
1775 * and the export path. If the hostname starts with a left square
1776 * bracket, then it may contain colons.
1777 *
1778 * Note: caller frees hostname and export path, even on error.
1779 */
1780 static int nfs_parse_devname(const char *dev_name,
1781 char **hostname, size_t maxnamlen,
1782 char **export_path, size_t maxpathlen)
1783 {
1784 size_t len;
1785 char *end;
1786
1787 /* Is the host name protected with square brakcets? */
1788 if (*dev_name == '[') {
1789 end = strchr(++dev_name, ']');
1790 if (end == NULL || end[1] != ':')
1791 goto out_bad_devname;
1792
1793 len = end - dev_name;
1794 end++;
1795 } else {
1796 char *comma;
1797
1798 end = strchr(dev_name, ':');
1799 if (end == NULL)
1800 goto out_bad_devname;
1801 len = end - dev_name;
1802
1803 /* kill possible hostname list: not supported */
1804 comma = strchr(dev_name, ',');
1805 if (comma != NULL && comma < end)
1806 *comma = 0;
1807 }
1808
1809 if (len > maxnamlen)
1810 goto out_hostname;
1811
1812 /* N.B. caller will free nfs_server.hostname in all cases */
1813 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1814 if (*hostname == NULL)
1815 goto out_nomem;
1816 len = strlen(++end);
1817 if (len > maxpathlen)
1818 goto out_path;
1819 *export_path = kstrndup(end, len, GFP_KERNEL);
1820 if (!*export_path)
1821 goto out_nomem;
1822
1823 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1824 return 0;
1825
1826 out_bad_devname:
1827 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1828 return -EINVAL;
1829
1830 out_nomem:
1831 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1832 return -ENOMEM;
1833
1834 out_hostname:
1835 dfprintk(MOUNT, "NFS: server hostname too long\n");
1836 return -ENAMETOOLONG;
1837
1838 out_path:
1839 dfprintk(MOUNT, "NFS: export pathname too long\n");
1840 return -ENAMETOOLONG;
1841 }
1842
1843 /*
1844 * Validate the NFS2/NFS3 mount data
1845 * - fills in the mount root filehandle
1846 *
1847 * For option strings, user space handles the following behaviors:
1848 *
1849 * + DNS: mapping server host name to IP address ("addr=" option)
1850 *
1851 * + failure mode: how to behave if a mount request can't be handled
1852 * immediately ("fg/bg" option)
1853 *
1854 * + retry: how often to retry a mount request ("retry=" option)
1855 *
1856 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1857 * mountproto=tcp after mountproto=udp, and so on
1858 */
1859 static int nfs23_validate_mount_data(void *options,
1860 struct nfs_parsed_mount_data *args,
1861 struct nfs_fh *mntfh,
1862 const char *dev_name)
1863 {
1864 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1865 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1866
1867 if (data == NULL)
1868 goto out_no_data;
1869
1870 switch (data->version) {
1871 case 1:
1872 data->namlen = 0;
1873 case 2:
1874 data->bsize = 0;
1875 case 3:
1876 if (data->flags & NFS_MOUNT_VER3)
1877 goto out_no_v3;
1878 data->root.size = NFS2_FHSIZE;
1879 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1880 case 4:
1881 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1882 goto out_no_sec;
1883 case 5:
1884 memset(data->context, 0, sizeof(data->context));
1885 case 6:
1886 if (data->flags & NFS_MOUNT_VER3) {
1887 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1888 goto out_invalid_fh;
1889 mntfh->size = data->root.size;
1890 args->version = 3;
1891 } else {
1892 mntfh->size = NFS2_FHSIZE;
1893 args->version = 2;
1894 }
1895
1896
1897 memcpy(mntfh->data, data->root.data, mntfh->size);
1898 if (mntfh->size < sizeof(mntfh->data))
1899 memset(mntfh->data + mntfh->size, 0,
1900 sizeof(mntfh->data) - mntfh->size);
1901
1902 /*
1903 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1904 * can deal with.
1905 */
1906 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1907 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1908 args->rsize = data->rsize;
1909 args->wsize = data->wsize;
1910 args->timeo = data->timeo;
1911 args->retrans = data->retrans;
1912 args->acregmin = data->acregmin;
1913 args->acregmax = data->acregmax;
1914 args->acdirmin = data->acdirmin;
1915 args->acdirmax = data->acdirmax;
1916 args->need_mount = false;
1917
1918 memcpy(sap, &data->addr, sizeof(data->addr));
1919 args->nfs_server.addrlen = sizeof(data->addr);
1920 if (!nfs_verify_server_address(sap))
1921 goto out_no_address;
1922
1923 if (!(data->flags & NFS_MOUNT_TCP))
1924 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1925 /* N.B. caller will free nfs_server.hostname in all cases */
1926 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1927 args->namlen = data->namlen;
1928 args->bsize = data->bsize;
1929
1930 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1931 args->auth_flavors[0] = data->pseudoflavor;
1932 if (!args->nfs_server.hostname)
1933 goto out_nomem;
1934
1935 if (!(data->flags & NFS_MOUNT_NONLM))
1936 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1937 NFS_MOUNT_LOCAL_FCNTL);
1938 else
1939 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1940 NFS_MOUNT_LOCAL_FCNTL);
1941 /*
1942 * The legacy version 6 binary mount data from userspace has a
1943 * field used only to transport selinux information into the
1944 * the kernel. To continue to support that functionality we
1945 * have a touch of selinux knowledge here in the NFS code. The
1946 * userspace code converted context=blah to just blah so we are
1947 * converting back to the full string selinux understands.
1948 */
1949 if (data->context[0]){
1950 #ifdef CONFIG_SECURITY_SELINUX
1951 int rc;
1952 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1953 if (!opts_str)
1954 return -ENOMEM;
1955 strcpy(opts_str, "context=");
1956 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1957 strcat(opts_str, &data->context[0]);
1958 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1959 kfree(opts_str);
1960 if (rc)
1961 return rc;
1962 #else
1963 return -EINVAL;
1964 #endif
1965 }
1966
1967 break;
1968 default:
1969 return NFS_TEXT_DATA;
1970 }
1971
1972 #ifndef CONFIG_NFS_V3
1973 if (args->version == 3)
1974 goto out_v3_not_compiled;
1975 #endif /* !CONFIG_NFS_V3 */
1976
1977 return 0;
1978
1979 out_no_data:
1980 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1981 return -EINVAL;
1982
1983 out_no_v3:
1984 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1985 data->version);
1986 return -EINVAL;
1987
1988 out_no_sec:
1989 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1990 return -EINVAL;
1991
1992 #ifndef CONFIG_NFS_V3
1993 out_v3_not_compiled:
1994 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1995 return -EPROTONOSUPPORT;
1996 #endif /* !CONFIG_NFS_V3 */
1997
1998 out_nomem:
1999 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2000 return -ENOMEM;
2001
2002 out_no_address:
2003 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2004 return -EINVAL;
2005
2006 out_invalid_fh:
2007 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2008 return -EINVAL;
2009 }
2010
2011 #ifdef CONFIG_NFS_V4
2012 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2013 void *options,
2014 struct nfs_parsed_mount_data *args,
2015 struct nfs_fh *mntfh,
2016 const char *dev_name)
2017 {
2018 if (fs_type == &nfs_fs_type)
2019 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2020 return nfs4_validate_mount_data(options, args, dev_name);
2021 }
2022 #else
2023 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2024 void *options,
2025 struct nfs_parsed_mount_data *args,
2026 struct nfs_fh *mntfh,
2027 const char *dev_name)
2028 {
2029 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2030 }
2031 #endif
2032
2033 static int nfs_validate_text_mount_data(void *options,
2034 struct nfs_parsed_mount_data *args,
2035 const char *dev_name)
2036 {
2037 int port = 0;
2038 int max_namelen = PAGE_SIZE;
2039 int max_pathlen = NFS_MAXPATHLEN;
2040 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2041
2042 if (nfs_parse_mount_options((char *)options, args) == 0)
2043 return -EINVAL;
2044
2045 if (!nfs_verify_server_address(sap))
2046 goto out_no_address;
2047
2048 if (args->version == 4) {
2049 #ifdef CONFIG_NFS_V4
2050 port = NFS_PORT;
2051 max_namelen = NFS4_MAXNAMLEN;
2052 max_pathlen = NFS4_MAXPATHLEN;
2053 nfs_validate_transport_protocol(args);
2054 nfs4_validate_mount_flags(args);
2055 #else
2056 goto out_v4_not_compiled;
2057 #endif /* CONFIG_NFS_V4 */
2058 } else
2059 nfs_set_mount_transport_protocol(args);
2060
2061 nfs_set_port(sap, &args->nfs_server.port, port);
2062
2063 if (args->auth_flavor_len > 1)
2064 goto out_bad_auth;
2065
2066 return nfs_parse_devname(dev_name,
2067 &args->nfs_server.hostname,
2068 max_namelen,
2069 &args->nfs_server.export_path,
2070 max_pathlen);
2071
2072 #ifndef CONFIG_NFS_V4
2073 out_v4_not_compiled:
2074 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2075 return -EPROTONOSUPPORT;
2076 #endif /* !CONFIG_NFS_V4 */
2077
2078 out_no_address:
2079 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2080 return -EINVAL;
2081
2082 out_bad_auth:
2083 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2084 return -EINVAL;
2085 }
2086
2087 static int
2088 nfs_compare_remount_data(struct nfs_server *nfss,
2089 struct nfs_parsed_mount_data *data)
2090 {
2091 if (data->flags != nfss->flags ||
2092 data->rsize != nfss->rsize ||
2093 data->wsize != nfss->wsize ||
2094 data->retrans != nfss->client->cl_timeout->to_retries ||
2095 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2096 data->acregmin != nfss->acregmin / HZ ||
2097 data->acregmax != nfss->acregmax / HZ ||
2098 data->acdirmin != nfss->acdirmin / HZ ||
2099 data->acdirmax != nfss->acdirmax / HZ ||
2100 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2101 data->nfs_server.port != nfss->port ||
2102 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2103 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2104 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2105 return -EINVAL;
2106
2107 return 0;
2108 }
2109
2110 static int
2111 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2112 {
2113 int error;
2114 struct nfs_server *nfss = sb->s_fs_info;
2115 struct nfs_parsed_mount_data *data;
2116 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2117 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2118 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2119
2120 /*
2121 * Userspace mount programs that send binary options generally send
2122 * them populated with default values. We have no way to know which
2123 * ones were explicitly specified. Fall back to legacy behavior and
2124 * just return success.
2125 */
2126 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2127 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2128 options->version <= 6))))
2129 return 0;
2130
2131 data = kzalloc(sizeof(*data), GFP_KERNEL);
2132 if (data == NULL)
2133 return -ENOMEM;
2134
2135 /* fill out struct with values from existing mount */
2136 data->flags = nfss->flags;
2137 data->rsize = nfss->rsize;
2138 data->wsize = nfss->wsize;
2139 data->retrans = nfss->client->cl_timeout->to_retries;
2140 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2141 data->acregmin = nfss->acregmin / HZ;
2142 data->acregmax = nfss->acregmax / HZ;
2143 data->acdirmin = nfss->acdirmin / HZ;
2144 data->acdirmax = nfss->acdirmax / HZ;
2145 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2146 data->nfs_server.port = nfss->port;
2147 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2148 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2149 data->nfs_server.addrlen);
2150
2151 /* overwrite those values with any that were specified */
2152 error = nfs_parse_mount_options((char *)options, data);
2153 if (error < 0)
2154 goto out;
2155
2156 /*
2157 * noac is a special case. It implies -o sync, but that's not
2158 * necessarily reflected in the mtab options. do_remount_sb
2159 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2160 * remount options, so we have to explicitly reset it.
2161 */
2162 if (data->flags & NFS_MOUNT_NOAC)
2163 *flags |= MS_SYNCHRONOUS;
2164
2165 /* compare new mount options with old ones */
2166 error = nfs_compare_remount_data(nfss, data);
2167 out:
2168 kfree(data);
2169 return error;
2170 }
2171
2172 /*
2173 * Initialise the common bits of the superblock
2174 */
2175 static inline void nfs_initialise_sb(struct super_block *sb)
2176 {
2177 struct nfs_server *server = NFS_SB(sb);
2178
2179 sb->s_magic = NFS_SUPER_MAGIC;
2180
2181 /* We probably want something more informative here */
2182 snprintf(sb->s_id, sizeof(sb->s_id),
2183 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2184
2185 if (sb->s_blocksize == 0)
2186 sb->s_blocksize = nfs_block_bits(server->wsize,
2187 &sb->s_blocksize_bits);
2188
2189 sb->s_bdi = &server->backing_dev_info;
2190
2191 nfs_super_set_maxbytes(sb, server->maxfilesize);
2192 }
2193
2194 /*
2195 * Finish setting up an NFS2/3 superblock
2196 */
2197 static void nfs_fill_super(struct super_block *sb,
2198 struct nfs_mount_info *mount_info)
2199 {
2200 struct nfs_parsed_mount_data *data = mount_info->parsed;
2201 struct nfs_server *server = NFS_SB(sb);
2202
2203 sb->s_blocksize_bits = 0;
2204 sb->s_blocksize = 0;
2205 if (data->bsize)
2206 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2207
2208 if (server->nfs_client->rpc_ops->version == 3) {
2209 /* The VFS shouldn't apply the umask to mode bits. We will do
2210 * so ourselves when necessary.
2211 */
2212 sb->s_flags |= MS_POSIXACL;
2213 sb->s_time_gran = 1;
2214 }
2215
2216 sb->s_op = &nfs_sops;
2217 nfs_initialise_sb(sb);
2218 }
2219
2220 /*
2221 * Finish setting up a cloned NFS2/3 superblock
2222 */
2223 static void nfs_clone_super(struct super_block *sb,
2224 struct nfs_mount_info *mount_info)
2225 {
2226 const struct super_block *old_sb = mount_info->cloned->sb;
2227 struct nfs_server *server = NFS_SB(sb);
2228
2229 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2230 sb->s_blocksize = old_sb->s_blocksize;
2231 sb->s_maxbytes = old_sb->s_maxbytes;
2232
2233 if (server->nfs_client->rpc_ops->version == 3) {
2234 /* The VFS shouldn't apply the umask to mode bits. We will do
2235 * so ourselves when necessary.
2236 */
2237 sb->s_flags |= MS_POSIXACL;
2238 sb->s_time_gran = 1;
2239 }
2240
2241 sb->s_op = old_sb->s_op;
2242 nfs_initialise_sb(sb);
2243 }
2244
2245 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2246 {
2247 const struct nfs_server *a = s->s_fs_info;
2248 const struct rpc_clnt *clnt_a = a->client;
2249 const struct rpc_clnt *clnt_b = b->client;
2250
2251 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2252 goto Ebusy;
2253 if (a->nfs_client != b->nfs_client)
2254 goto Ebusy;
2255 if (a->flags != b->flags)
2256 goto Ebusy;
2257 if (a->wsize != b->wsize)
2258 goto Ebusy;
2259 if (a->rsize != b->rsize)
2260 goto Ebusy;
2261 if (a->acregmin != b->acregmin)
2262 goto Ebusy;
2263 if (a->acregmax != b->acregmax)
2264 goto Ebusy;
2265 if (a->acdirmin != b->acdirmin)
2266 goto Ebusy;
2267 if (a->acdirmax != b->acdirmax)
2268 goto Ebusy;
2269 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2270 goto Ebusy;
2271 return 1;
2272 Ebusy:
2273 return 0;
2274 }
2275
2276 struct nfs_sb_mountdata {
2277 struct nfs_server *server;
2278 int mntflags;
2279 };
2280
2281 static int nfs_set_super(struct super_block *s, void *data)
2282 {
2283 struct nfs_sb_mountdata *sb_mntdata = data;
2284 struct nfs_server *server = sb_mntdata->server;
2285 int ret;
2286
2287 s->s_flags = sb_mntdata->mntflags;
2288 s->s_fs_info = server;
2289 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2290 ret = set_anon_super(s, server);
2291 if (ret == 0)
2292 server->s_dev = s->s_dev;
2293 return ret;
2294 }
2295
2296 static int nfs_compare_super_address(struct nfs_server *server1,
2297 struct nfs_server *server2)
2298 {
2299 struct sockaddr *sap1, *sap2;
2300
2301 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2302 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2303
2304 if (sap1->sa_family != sap2->sa_family)
2305 return 0;
2306
2307 switch (sap1->sa_family) {
2308 case AF_INET: {
2309 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2310 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2311 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2312 return 0;
2313 if (sin1->sin_port != sin2->sin_port)
2314 return 0;
2315 break;
2316 }
2317 case AF_INET6: {
2318 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2319 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2320 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2321 return 0;
2322 if (sin1->sin6_port != sin2->sin6_port)
2323 return 0;
2324 break;
2325 }
2326 default:
2327 return 0;
2328 }
2329
2330 return 1;
2331 }
2332
2333 static int nfs_compare_super(struct super_block *sb, void *data)
2334 {
2335 struct nfs_sb_mountdata *sb_mntdata = data;
2336 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2337 int mntflags = sb_mntdata->mntflags;
2338
2339 if (!nfs_compare_super_address(old, server))
2340 return 0;
2341 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2342 if (old->flags & NFS_MOUNT_UNSHARED)
2343 return 0;
2344 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2345 return 0;
2346 return nfs_compare_mount_options(sb, server, mntflags);
2347 }
2348
2349 #ifdef CONFIG_NFS_FSCACHE
2350 static void nfs_get_cache_cookie(struct super_block *sb,
2351 struct nfs_parsed_mount_data *parsed,
2352 struct nfs_clone_mount *cloned)
2353 {
2354 char *uniq = NULL;
2355 int ulen = 0;
2356
2357 if (parsed && parsed->fscache_uniq) {
2358 uniq = parsed->fscache_uniq;
2359 ulen = strlen(parsed->fscache_uniq);
2360 } else if (cloned) {
2361 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2362 if (mnt_s->fscache_key) {
2363 uniq = mnt_s->fscache_key->key.uniquifier;
2364 ulen = mnt_s->fscache_key->key.uniq_len;
2365 };
2366 }
2367
2368 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2369 }
2370 #else
2371 static void nfs_get_cache_cookie(struct super_block *sb,
2372 struct nfs_parsed_mount_data *parsed,
2373 struct nfs_clone_mount *cloned)
2374 {
2375 }
2376 #endif
2377
2378 static int nfs_bdi_register(struct nfs_server *server)
2379 {
2380 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2381 }
2382
2383 static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2384 struct nfs_mount_info *mount_info)
2385 {
2386 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2387 }
2388
2389 static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2390 struct nfs_mount_info *mount_info)
2391 {
2392 /* clone any lsm security options from the parent to the new sb */
2393 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2394 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2395 return -ESTALE;
2396 return 0;
2397 }
2398
2399 static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2400 struct nfs_server *server,
2401 int flags, const char *dev_name,
2402 struct nfs_mount_info *mount_info)
2403 {
2404 struct super_block *s;
2405 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2406 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2407 struct nfs_sb_mountdata sb_mntdata = {
2408 .mntflags = flags,
2409 .server = server,
2410 };
2411 int error;
2412
2413 if (server->flags & NFS_MOUNT_UNSHARED)
2414 compare_super = NULL;
2415
2416 /* -o noac implies -o sync */
2417 if (server->flags & NFS_MOUNT_NOAC)
2418 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2419
2420 /* Get a superblock - note that we may end up sharing one that already exists */
2421 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2422 if (IS_ERR(s)) {
2423 mntroot = ERR_CAST(s);
2424 goto out_err_nosb;
2425 }
2426
2427 if (s->s_fs_info != server) {
2428 nfs_free_server(server);
2429 server = NULL;
2430 } else {
2431 error = nfs_bdi_register(server);
2432 if (error) {
2433 mntroot = ERR_PTR(error);
2434 goto error_splat_bdi;
2435 }
2436 }
2437
2438 if (!s->s_root) {
2439 /* initial superblock/root creation */
2440 mount_info->fill_super(s, mount_info);
2441 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2442 }
2443
2444 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2445 if (IS_ERR(mntroot))
2446 goto error_splat_super;
2447
2448 error = mount_info->set_security(s, mntroot, mount_info);
2449 if (error)
2450 goto error_splat_root;
2451
2452 s->s_flags |= MS_ACTIVE;
2453
2454 out:
2455 return mntroot;
2456
2457 out_err_nosb:
2458 nfs_free_server(server);
2459 goto out;
2460
2461 error_splat_root:
2462 dput(mntroot);
2463 mntroot = ERR_PTR(error);
2464 error_splat_super:
2465 if (server && !s->s_root)
2466 bdi_unregister(&server->backing_dev_info);
2467 error_splat_bdi:
2468 deactivate_locked_super(s);
2469 goto out;
2470 }
2471
2472 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2473 int flags, const char *dev_name, void *raw_data)
2474 {
2475 struct nfs_mount_info mount_info = {
2476 .fill_super = nfs_fill_super,
2477 .set_security = nfs_set_sb_security,
2478 };
2479 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2480 int error;
2481
2482 mount_info.parsed = nfs_alloc_parsed_mount_data();
2483 mount_info.mntfh = nfs_alloc_fhandle();
2484 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2485 goto out;
2486
2487 /* Validate the mount data */
2488 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2489 if (error == NFS_TEXT_DATA)
2490 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2491 if (error < 0) {
2492 mntroot = ERR_PTR(error);
2493 goto out;
2494 }
2495
2496 #ifdef CONFIG_NFS_V4
2497 if (mount_info.parsed->version == 4)
2498 mntroot = nfs4_try_mount(flags, dev_name, &mount_info);
2499 else
2500 #endif /* CONFIG_NFS_V4 */
2501 mntroot = nfs_try_mount(flags, dev_name, &mount_info);
2502
2503 out:
2504 nfs_free_parsed_mount_data(mount_info.parsed);
2505 nfs_free_fhandle(mount_info.mntfh);
2506 return mntroot;
2507 }
2508
2509 /*
2510 * Ensure that we unregister the bdi before kill_anon_super
2511 * releases the device name
2512 */
2513 static void nfs_put_super(struct super_block *s)
2514 {
2515 struct nfs_server *server = NFS_SB(s);
2516
2517 bdi_unregister(&server->backing_dev_info);
2518 }
2519
2520 /*
2521 * Destroy an NFS2/3 superblock
2522 */
2523 static void nfs_kill_super(struct super_block *s)
2524 {
2525 struct nfs_server *server = NFS_SB(s);
2526
2527 kill_anon_super(s);
2528 nfs_fscache_release_super_cookie(s);
2529 nfs_free_server(server);
2530 }
2531
2532 /*
2533 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2534 */
2535 static struct dentry *
2536 nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2537 const char *dev_name, struct nfs_mount_info *mount_info)
2538 {
2539 struct nfs_clone_mount *data = mount_info->cloned;
2540 struct nfs_server *server;
2541 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2542 int error;
2543
2544 dprintk("--> nfs_xdev_mount_common()\n");
2545
2546 mount_info->mntfh = data->fh;
2547
2548 /* create a new volume representation */
2549 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2550 if (IS_ERR(server)) {
2551 error = PTR_ERR(server);
2552 goto out_err;
2553 }
2554
2555 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2556 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2557 out:
2558 return mntroot;
2559
2560 out_err:
2561 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2562 goto out;
2563 }
2564
2565 /*
2566 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2567 */
2568 static struct dentry *
2569 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2570 const char *dev_name, void *raw_data)
2571 {
2572 struct nfs_mount_info mount_info = {
2573 .fill_super = nfs_clone_super,
2574 .set_security = nfs_clone_sb_security,
2575 .cloned = raw_data,
2576 };
2577 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2578 }
2579
2580 #ifdef CONFIG_NFS_V4
2581
2582 /*
2583 * Finish setting up a cloned NFS4 superblock
2584 */
2585 static void nfs4_clone_super(struct super_block *sb,
2586 struct nfs_mount_info *mount_info)
2587 {
2588 const struct super_block *old_sb = mount_info->cloned->sb;
2589 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2590 sb->s_blocksize = old_sb->s_blocksize;
2591 sb->s_maxbytes = old_sb->s_maxbytes;
2592 sb->s_time_gran = 1;
2593 sb->s_op = old_sb->s_op;
2594 /*
2595 * The VFS shouldn't apply the umask to mode bits. We will do
2596 * so ourselves when necessary.
2597 */
2598 sb->s_flags |= MS_POSIXACL;
2599 sb->s_xattr = old_sb->s_xattr;
2600 nfs_initialise_sb(sb);
2601 }
2602
2603 /*
2604 * Set up an NFS4 superblock
2605 */
2606 static void nfs4_fill_super(struct super_block *sb,
2607 struct nfs_mount_info *mount_info)
2608 {
2609 sb->s_time_gran = 1;
2610 sb->s_op = &nfs4_sops;
2611 /*
2612 * The VFS shouldn't apply the umask to mode bits. We will do
2613 * so ourselves when necessary.
2614 */
2615 sb->s_flags |= MS_POSIXACL;
2616 sb->s_xattr = nfs4_xattr_handlers;
2617 nfs_initialise_sb(sb);
2618 }
2619
2620 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2621 {
2622 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2623 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2624 }
2625
2626 /*
2627 * Validate NFSv4 mount options
2628 */
2629 static int nfs4_validate_mount_data(void *options,
2630 struct nfs_parsed_mount_data *args,
2631 const char *dev_name)
2632 {
2633 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2634 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2635 char *c;
2636
2637 if (data == NULL)
2638 goto out_no_data;
2639
2640 switch (data->version) {
2641 case 1:
2642 if (data->host_addrlen > sizeof(args->nfs_server.address))
2643 goto out_no_address;
2644 if (data->host_addrlen == 0)
2645 goto out_no_address;
2646 args->nfs_server.addrlen = data->host_addrlen;
2647 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2648 return -EFAULT;
2649 if (!nfs_verify_server_address(sap))
2650 goto out_no_address;
2651
2652 if (data->auth_flavourlen) {
2653 if (data->auth_flavourlen > 1)
2654 goto out_inval_auth;
2655 if (copy_from_user(&args->auth_flavors[0],
2656 data->auth_flavours,
2657 sizeof(args->auth_flavors[0])))
2658 return -EFAULT;
2659 }
2660
2661 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
2664 args->nfs_server.hostname = c;
2665
2666 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2667 if (IS_ERR(c))
2668 return PTR_ERR(c);
2669 args->nfs_server.export_path = c;
2670 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2671
2672 c = strndup_user(data->client_addr.data, 16);
2673 if (IS_ERR(c))
2674 return PTR_ERR(c);
2675 args->client_address = c;
2676
2677 /*
2678 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2679 * can deal with.
2680 */
2681
2682 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2683 args->rsize = data->rsize;
2684 args->wsize = data->wsize;
2685 args->timeo = data->timeo;
2686 args->retrans = data->retrans;
2687 args->acregmin = data->acregmin;
2688 args->acregmax = data->acregmax;
2689 args->acdirmin = data->acdirmin;
2690 args->acdirmax = data->acdirmax;
2691 args->nfs_server.protocol = data->proto;
2692 nfs_validate_transport_protocol(args);
2693
2694 break;
2695 default:
2696 return NFS_TEXT_DATA;
2697 }
2698
2699 return 0;
2700
2701 out_no_data:
2702 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2703 return -EINVAL;
2704
2705 out_inval_auth:
2706 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2707 data->auth_flavourlen);
2708 return -EINVAL;
2709
2710 out_no_address:
2711 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2712 return -EINVAL;
2713 }
2714
2715 /*
2716 * Get the superblock for the NFS4 root partition
2717 */
2718 static struct dentry *
2719 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2720 const char *dev_name, void *info)
2721 {
2722 struct nfs_mount_info *mount_info = info;
2723 struct nfs_server *server;
2724 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2725
2726 mount_info->fill_super = nfs4_fill_super;
2727 mount_info->set_security = nfs_set_sb_security;
2728
2729 /* Get a volume representation */
2730 server = nfs4_create_server(mount_info->parsed, mount_info->mntfh);
2731 if (IS_ERR(server)) {
2732 mntroot = ERR_CAST(server);
2733 goto out;
2734 }
2735
2736 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
2737
2738 out:
2739 return mntroot;
2740 }
2741
2742 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2743 int flags, void *data, const char *hostname)
2744 {
2745 struct vfsmount *root_mnt;
2746 char *root_devname;
2747 size_t len;
2748
2749 len = strlen(hostname) + 5;
2750 root_devname = kmalloc(len, GFP_KERNEL);
2751 if (root_devname == NULL)
2752 return ERR_PTR(-ENOMEM);
2753 /* Does hostname needs to be enclosed in brackets? */
2754 if (strchr(hostname, ':'))
2755 snprintf(root_devname, len, "[%s]:/", hostname);
2756 else
2757 snprintf(root_devname, len, "%s:/", hostname);
2758 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2759 kfree(root_devname);
2760 return root_mnt;
2761 }
2762
2763 struct nfs_referral_count {
2764 struct list_head list;
2765 const struct task_struct *task;
2766 unsigned int referral_count;
2767 };
2768
2769 static LIST_HEAD(nfs_referral_count_list);
2770 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2771
2772 static struct nfs_referral_count *nfs_find_referral_count(void)
2773 {
2774 struct nfs_referral_count *p;
2775
2776 list_for_each_entry(p, &nfs_referral_count_list, list) {
2777 if (p->task == current)
2778 return p;
2779 }
2780 return NULL;
2781 }
2782
2783 #define NFS_MAX_NESTED_REFERRALS 2
2784
2785 static int nfs_referral_loop_protect(void)
2786 {
2787 struct nfs_referral_count *p, *new;
2788 int ret = -ENOMEM;
2789
2790 new = kmalloc(sizeof(*new), GFP_KERNEL);
2791 if (!new)
2792 goto out;
2793 new->task = current;
2794 new->referral_count = 1;
2795
2796 ret = 0;
2797 spin_lock(&nfs_referral_count_list_lock);
2798 p = nfs_find_referral_count();
2799 if (p != NULL) {
2800 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2801 ret = -ELOOP;
2802 else
2803 p->referral_count++;
2804 } else {
2805 list_add(&new->list, &nfs_referral_count_list);
2806 new = NULL;
2807 }
2808 spin_unlock(&nfs_referral_count_list_lock);
2809 kfree(new);
2810 out:
2811 return ret;
2812 }
2813
2814 static void nfs_referral_loop_unprotect(void)
2815 {
2816 struct nfs_referral_count *p;
2817
2818 spin_lock(&nfs_referral_count_list_lock);
2819 p = nfs_find_referral_count();
2820 p->referral_count--;
2821 if (p->referral_count == 0)
2822 list_del(&p->list);
2823 else
2824 p = NULL;
2825 spin_unlock(&nfs_referral_count_list_lock);
2826 kfree(p);
2827 }
2828
2829 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2830 const char *export_path)
2831 {
2832 struct dentry *dentry;
2833 int err;
2834
2835 if (IS_ERR(root_mnt))
2836 return ERR_CAST(root_mnt);
2837
2838 err = nfs_referral_loop_protect();
2839 if (err) {
2840 mntput(root_mnt);
2841 return ERR_PTR(err);
2842 }
2843
2844 dentry = mount_subtree(root_mnt, export_path);
2845 nfs_referral_loop_unprotect();
2846
2847 return dentry;
2848 }
2849
2850 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2851 struct nfs_mount_info *mount_info)
2852 {
2853 char *export_path;
2854 struct vfsmount *root_mnt;
2855 struct dentry *res;
2856 struct nfs_parsed_mount_data *data = mount_info->parsed;
2857
2858 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2859
2860 export_path = data->nfs_server.export_path;
2861 data->nfs_server.export_path = "/";
2862 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
2863 data->nfs_server.hostname);
2864 data->nfs_server.export_path = export_path;
2865
2866 res = nfs_follow_remote_path(root_mnt, export_path);
2867
2868 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2869 IS_ERR(res) ? PTR_ERR(res) : 0,
2870 IS_ERR(res) ? " [error]" : "");
2871 return res;
2872 }
2873
2874 static void nfs4_kill_super(struct super_block *sb)
2875 {
2876 struct nfs_server *server = NFS_SB(sb);
2877
2878 dprintk("--> %s\n", __func__);
2879 nfs_super_return_all_delegations(sb);
2880 kill_anon_super(sb);
2881 nfs_fscache_release_super_cookie(sb);
2882 nfs_free_server(server);
2883 dprintk("<-- %s\n", __func__);
2884 }
2885
2886 /*
2887 * Clone an NFS4 server record on xdev traversal (FSID-change)
2888 */
2889 static struct dentry *
2890 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2891 const char *dev_name, void *raw_data)
2892 {
2893 struct nfs_mount_info mount_info = {
2894 .fill_super = nfs4_clone_super,
2895 .set_security = nfs_clone_sb_security,
2896 .cloned = raw_data,
2897 };
2898 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
2899 }
2900
2901 static struct dentry *
2902 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2903 const char *dev_name, void *raw_data)
2904 {
2905 struct nfs_mount_info mount_info = {
2906 .fill_super = nfs4_fill_super,
2907 .set_security = nfs_clone_sb_security,
2908 .cloned = raw_data,
2909 };
2910 struct nfs_server *server;
2911 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2912
2913 dprintk("--> nfs4_referral_get_sb()\n");
2914
2915 mount_info.mntfh = nfs_alloc_fhandle();
2916 if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
2917 goto out;
2918
2919 /* create a new volume representation */
2920 server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
2921 if (IS_ERR(server)) {
2922 mntroot = ERR_CAST(server);
2923 goto out;
2924 }
2925
2926 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info);
2927 out:
2928 nfs_free_fhandle(mount_info.mntfh);
2929 return mntroot;
2930 }
2931
2932 /*
2933 * Create an NFS4 server record on referral traversal
2934 */
2935 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2936 int flags, const char *dev_name, void *raw_data)
2937 {
2938 struct nfs_clone_mount *data = raw_data;
2939 char *export_path;
2940 struct vfsmount *root_mnt;
2941 struct dentry *res;
2942
2943 dprintk("--> nfs4_referral_mount()\n");
2944
2945 export_path = data->mnt_path;
2946 data->mnt_path = "/";
2947
2948 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2949 flags, data, data->hostname);
2950 data->mnt_path = export_path;
2951
2952 res = nfs_follow_remote_path(root_mnt, export_path);
2953 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2954 IS_ERR(res) ? PTR_ERR(res) : 0,
2955 IS_ERR(res) ? " [error]" : "");
2956 return res;
2957 }
2958
2959 #endif /* CONFIG_NFS_V4 */
Linux 2.6 libata-dev (mirror)