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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / fs / nfs / super.c
blobe4622eec33042f7dd42d69289f4b99ce94b1f6b8
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
56 #include <asm/system.h>
57 #include <asm/uaccess.h>
58
59 #include "nfs4_fs.h"
60 #include "callback.h"
61 #include "delegation.h"
62 #include "iostat.h"
63 #include "internal.h"
64 #include "fscache.h"
65 #include "pnfs.h"
66
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 #ifdef CONFIG_NFS_V3
70 #define NFS_DEFAULT_VERSION 3
71 #else
72 #define NFS_DEFAULT_VERSION 2
73 #endif
74
75 enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
82 Opt_v2, Opt_v3, Opt_v4,
83 Opt_udp, Opt_tcp, Opt_rdma,
84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
86 Opt_sharecache, Opt_nosharecache,
87 Opt_resvport, Opt_noresvport,
88 Opt_fscache, Opt_nofscache,
89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
99 Opt_mountvers,
100 Opt_nfsvers,
101 Opt_minorversion,
102
103 /* Mount options that take string arguments */
104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
106 Opt_lookupcache,
107 Opt_fscache_uniq,
108 Opt_local_lock,
109
110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
112
113 Opt_err
114 };
115
116 static const match_table_t nfs_mount_option_tokens = {
117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
119 { Opt_userspace, "retry=%s" },
120
121 { Opt_sloppy, "sloppy" },
122
123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
135 { Opt_v2, "v2" },
136 { Opt_v3, "v3" },
137 { Opt_v4, "v4" },
138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
140 { Opt_rdma, "rdma" },
141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
149 { Opt_fscache, "fsc" },
150 { Opt_nofscache, "nofsc" },
151
152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168 { Opt_minorversion, "minorversion=%s" },
169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
175 { Opt_mounthost, "mounthost=%s" },
176 { Opt_mountaddr, "mountaddr=%s" },
177
178 { Opt_lookupcache, "lookupcache=%s" },
179 { Opt_fscache_uniq, "fsc=%s" },
180 { Opt_local_lock, "local_lock=%s" },
181
182 { Opt_err, NULL }
183 };
184
185 enum {
186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
187
188 Opt_xprt_err
189 };
190
191 static const match_table_t nfs_xprt_protocol_tokens = {
192 { Opt_xprt_udp, "udp" },
193 { Opt_xprt_udp6, "udp6" },
194 { Opt_xprt_tcp, "tcp" },
195 { Opt_xprt_tcp6, "tcp6" },
196 { Opt_xprt_rdma, "rdma" },
197
198 { Opt_xprt_err, NULL }
199 };
200
201 enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208 };
209
210 static const match_table_t nfs_secflavor_tokens = {
211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
227 { Opt_sec_err, NULL }
228 };
229
230 enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235 };
236
237 static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244 };
245
246 enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251 };
252
253 static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260 };
261
262
263 static void nfs_umount_begin(struct super_block *);
264 static int nfs_statfs(struct dentry *, struct kstatfs *);
265 static int nfs_show_options(struct seq_file *, struct dentry *);
266 static int nfs_show_devname(struct seq_file *, struct dentry *);
267 static int nfs_show_path(struct seq_file *, struct dentry *);
268 static int nfs_show_stats(struct seq_file *, struct dentry *);
269 static struct dentry *nfs_fs_mount(struct file_system_type *,
270 int, const char *, void *);
271 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data);
273 static void nfs_put_super(struct super_block *);
274 static void nfs_kill_super(struct super_block *);
275 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
276
277 static struct file_system_type nfs_fs_type = {
278 .owner = THIS_MODULE,
279 .name = "nfs",
280 .mount = nfs_fs_mount,
281 .kill_sb = nfs_kill_super,
282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
283 };
284
285 struct file_system_type nfs_xdev_fs_type = {
286 .owner = THIS_MODULE,
287 .name = "nfs",
288 .mount = nfs_xdev_mount,
289 .kill_sb = nfs_kill_super,
290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
291 };
292
293 static const struct super_operations nfs_sops = {
294 .alloc_inode = nfs_alloc_inode,
295 .destroy_inode = nfs_destroy_inode,
296 .write_inode = nfs_write_inode,
297 .put_super = nfs_put_super,
298 .statfs = nfs_statfs,
299 .evict_inode = nfs_evict_inode,
300 .umount_begin = nfs_umount_begin,
301 .show_options = nfs_show_options,
302 .show_devname = nfs_show_devname,
303 .show_path = nfs_show_path,
304 .show_stats = nfs_show_stats,
305 .remount_fs = nfs_remount,
306 };
307
308 #ifdef CONFIG_NFS_V4
309 static int nfs4_validate_text_mount_data(void *options,
310 struct nfs_parsed_mount_data *args, const char *dev_name);
311 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
312 struct nfs_parsed_mount_data *data);
313 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
314 int flags, const char *dev_name, void *raw_data);
315 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
316 int flags, const char *dev_name, void *raw_data);
317 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *raw_data);
319 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
320 int flags, const char *dev_name, void *raw_data);
321 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
322 int flags, const char *dev_name, void *raw_data);
323 static void nfs4_kill_super(struct super_block *sb);
324
325 static struct file_system_type nfs4_fs_type = {
326 .owner = THIS_MODULE,
327 .name = "nfs4",
328 .mount = nfs4_mount,
329 .kill_sb = nfs4_kill_super,
330 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
331 };
332
333 static struct file_system_type nfs4_remote_fs_type = {
334 .owner = THIS_MODULE,
335 .name = "nfs4",
336 .mount = nfs4_remote_mount,
337 .kill_sb = nfs4_kill_super,
338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
339 };
340
341 struct file_system_type nfs4_xdev_fs_type = {
342 .owner = THIS_MODULE,
343 .name = "nfs4",
344 .mount = nfs4_xdev_mount,
345 .kill_sb = nfs4_kill_super,
346 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
347 };
348
349 static struct file_system_type nfs4_remote_referral_fs_type = {
350 .owner = THIS_MODULE,
351 .name = "nfs4",
352 .mount = nfs4_remote_referral_mount,
353 .kill_sb = nfs4_kill_super,
354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
355 };
356
357 struct file_system_type nfs4_referral_fs_type = {
358 .owner = THIS_MODULE,
359 .name = "nfs4",
360 .mount = nfs4_referral_mount,
361 .kill_sb = nfs4_kill_super,
362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
363 };
364
365 static const struct super_operations nfs4_sops = {
366 .alloc_inode = nfs_alloc_inode,
367 .destroy_inode = nfs_destroy_inode,
368 .write_inode = nfs_write_inode,
369 .put_super = nfs_put_super,
370 .statfs = nfs_statfs,
371 .evict_inode = nfs4_evict_inode,
372 .umount_begin = nfs_umount_begin,
373 .show_options = nfs_show_options,
374 .show_devname = nfs_show_devname,
375 .show_path = nfs_show_path,
376 .show_stats = nfs_show_stats,
377 .remount_fs = nfs_remount,
378 };
379 #endif
380
381 static struct shrinker acl_shrinker = {
382 .shrink = nfs_access_cache_shrinker,
383 .seeks = DEFAULT_SEEKS,
384 };
385
386 /*
387 * Register the NFS filesystems
388 */
389 int __init register_nfs_fs(void)
390 {
391 int ret;
392
393 ret = register_filesystem(&nfs_fs_type);
394 if (ret < 0)
395 goto error_0;
396
397 ret = nfs_register_sysctl();
398 if (ret < 0)
399 goto error_1;
400 #ifdef CONFIG_NFS_V4
401 ret = register_filesystem(&nfs4_fs_type);
402 if (ret < 0)
403 goto error_2;
404 #endif
405 register_shrinker(&acl_shrinker);
406 return 0;
407
408 #ifdef CONFIG_NFS_V4
409 error_2:
410 nfs_unregister_sysctl();
411 #endif
412 error_1:
413 unregister_filesystem(&nfs_fs_type);
414 error_0:
415 return ret;
416 }
417
418 /*
419 * Unregister the NFS filesystems
420 */
421 void __exit unregister_nfs_fs(void)
422 {
423 unregister_shrinker(&acl_shrinker);
424 #ifdef CONFIG_NFS_V4
425 unregister_filesystem(&nfs4_fs_type);
426 #endif
427 nfs_unregister_sysctl();
428 unregister_filesystem(&nfs_fs_type);
429 }
430
431 void nfs_sb_active(struct super_block *sb)
432 {
433 struct nfs_server *server = NFS_SB(sb);
434
435 if (atomic_inc_return(&server->active) == 1)
436 atomic_inc(&sb->s_active);
437 }
438
439 void nfs_sb_deactive(struct super_block *sb)
440 {
441 struct nfs_server *server = NFS_SB(sb);
442
443 if (atomic_dec_and_test(&server->active))
444 deactivate_super(sb);
445 }
446
447 /*
448 * Deliver file system statistics to userspace
449 */
450 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
451 {
452 struct nfs_server *server = NFS_SB(dentry->d_sb);
453 unsigned char blockbits;
454 unsigned long blockres;
455 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
456 struct nfs_fsstat res;
457 int error = -ENOMEM;
458
459 res.fattr = nfs_alloc_fattr();
460 if (res.fattr == NULL)
461 goto out_err;
462
463 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
464 if (unlikely(error == -ESTALE)) {
465 struct dentry *pd_dentry;
466
467 pd_dentry = dget_parent(dentry);
468 if (pd_dentry != NULL) {
469 nfs_zap_caches(pd_dentry->d_inode);
470 dput(pd_dentry);
471 }
472 }
473 nfs_free_fattr(res.fattr);
474 if (error < 0)
475 goto out_err;
476
477 buf->f_type = NFS_SUPER_MAGIC;
478
479 /*
480 * Current versions of glibc do not correctly handle the
481 * case where f_frsize != f_bsize. Eventually we want to
482 * report the value of wtmult in this field.
483 */
484 buf->f_frsize = dentry->d_sb->s_blocksize;
485
486 /*
487 * On most *nix systems, f_blocks, f_bfree, and f_bavail
488 * are reported in units of f_frsize. Linux hasn't had
489 * an f_frsize field in its statfs struct until recently,
490 * thus historically Linux's sys_statfs reports these
491 * fields in units of f_bsize.
492 */
493 buf->f_bsize = dentry->d_sb->s_blocksize;
494 blockbits = dentry->d_sb->s_blocksize_bits;
495 blockres = (1 << blockbits) - 1;
496 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
497 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
498 buf->f_bavail = (res.abytes + blockres) >> blockbits;
499
500 buf->f_files = res.tfiles;
501 buf->f_ffree = res.afiles;
502
503 buf->f_namelen = server->namelen;
504
505 return 0;
506
507 out_err:
508 dprintk("%s: statfs error = %d\n", __func__, -error);
509 return error;
510 }
511
512 /*
513 * Map the security flavour number to a name
514 */
515 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
516 {
517 static const struct {
518 rpc_authflavor_t flavour;
519 const char *str;
520 } sec_flavours[] = {
521 { RPC_AUTH_NULL, "null" },
522 { RPC_AUTH_UNIX, "sys" },
523 { RPC_AUTH_GSS_KRB5, "krb5" },
524 { RPC_AUTH_GSS_KRB5I, "krb5i" },
525 { RPC_AUTH_GSS_KRB5P, "krb5p" },
526 { RPC_AUTH_GSS_LKEY, "lkey" },
527 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
528 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
529 { RPC_AUTH_GSS_SPKM, "spkm" },
530 { RPC_AUTH_GSS_SPKMI, "spkmi" },
531 { RPC_AUTH_GSS_SPKMP, "spkmp" },
532 { UINT_MAX, "unknown" }
533 };
534 int i;
535
536 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
537 if (sec_flavours[i].flavour == flavour)
538 break;
539 }
540 return sec_flavours[i].str;
541 }
542
543 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
544 int showdefaults)
545 {
546 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
547
548 seq_printf(m, ",mountproto=");
549 switch (sap->sa_family) {
550 case AF_INET:
551 switch (nfss->mountd_protocol) {
552 case IPPROTO_UDP:
553 seq_printf(m, RPCBIND_NETID_UDP);
554 break;
555 case IPPROTO_TCP:
556 seq_printf(m, RPCBIND_NETID_TCP);
557 break;
558 default:
559 if (showdefaults)
560 seq_printf(m, "auto");
561 }
562 break;
563 case AF_INET6:
564 switch (nfss->mountd_protocol) {
565 case IPPROTO_UDP:
566 seq_printf(m, RPCBIND_NETID_UDP6);
567 break;
568 case IPPROTO_TCP:
569 seq_printf(m, RPCBIND_NETID_TCP6);
570 break;
571 default:
572 if (showdefaults)
573 seq_printf(m, "auto");
574 }
575 break;
576 default:
577 if (showdefaults)
578 seq_printf(m, "auto");
579 }
580 }
581
582 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
583 int showdefaults)
584 {
585 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
586
587 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
588 return;
589
590 switch (sap->sa_family) {
591 case AF_INET: {
592 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
593 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
594 break;
595 }
596 case AF_INET6: {
597 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
598 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
599 break;
600 }
601 default:
602 if (showdefaults)
603 seq_printf(m, ",mountaddr=unspecified");
604 }
605
606 if (nfss->mountd_version || showdefaults)
607 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
608 if ((nfss->mountd_port &&
609 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
610 showdefaults)
611 seq_printf(m, ",mountport=%u", nfss->mountd_port);
612
613 nfs_show_mountd_netid(m, nfss, showdefaults);
614 }
615
616 #ifdef CONFIG_NFS_V4
617 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619 {
620 struct nfs_client *clp = nfss->nfs_client;
621
622 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
623 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
624 }
625 #else
626 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
628 {
629 }
630 #endif
631
632 /*
633 * Describe the mount options in force on this server representation
634 */
635 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
636 int showdefaults)
637 {
638 static const struct proc_nfs_info {
639 int flag;
640 const char *str;
641 const char *nostr;
642 } nfs_info[] = {
643 { NFS_MOUNT_SOFT, ",soft", ",hard" },
644 { NFS_MOUNT_POSIX, ",posix", "" },
645 { NFS_MOUNT_NOCTO, ",nocto", "" },
646 { NFS_MOUNT_NOAC, ",noac", "" },
647 { NFS_MOUNT_NONLM, ",nolock", "" },
648 { NFS_MOUNT_NOACL, ",noacl", "" },
649 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
650 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
651 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
652 { 0, NULL, NULL }
653 };
654 const struct proc_nfs_info *nfs_infop;
655 struct nfs_client *clp = nfss->nfs_client;
656 u32 version = clp->rpc_ops->version;
657 int local_flock, local_fcntl;
658
659 seq_printf(m, ",vers=%u", version);
660 seq_printf(m, ",rsize=%u", nfss->rsize);
661 seq_printf(m, ",wsize=%u", nfss->wsize);
662 if (nfss->bsize != 0)
663 seq_printf(m, ",bsize=%u", nfss->bsize);
664 seq_printf(m, ",namlen=%u", nfss->namelen);
665 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
666 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
667 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
668 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
669 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
670 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
671 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
672 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
673 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
674 if (nfss->flags & nfs_infop->flag)
675 seq_puts(m, nfs_infop->str);
676 else
677 seq_puts(m, nfs_infop->nostr);
678 }
679 seq_printf(m, ",proto=%s",
680 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
681 if (version == 4) {
682 if (nfss->port != NFS_PORT)
683 seq_printf(m, ",port=%u", nfss->port);
684 } else
685 if (nfss->port)
686 seq_printf(m, ",port=%u", nfss->port);
687
688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
691
692 if (version != 4)
693 nfs_show_mountd_options(m, nfss, showdefaults);
694 else
695 nfs_show_nfsv4_options(m, nfss, showdefaults);
696
697 if (nfss->options & NFS_OPTION_FSCACHE)
698 seq_printf(m, ",fsc");
699
700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
702 seq_printf(m, ",lookupcache=none");
703 else
704 seq_printf(m, ",lookupcache=pos");
705 }
706
707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
709
710 if (!local_flock && !local_fcntl)
711 seq_printf(m, ",local_lock=none");
712 else if (local_flock && local_fcntl)
713 seq_printf(m, ",local_lock=all");
714 else if (local_flock)
715 seq_printf(m, ",local_lock=flock");
716 else
717 seq_printf(m, ",local_lock=posix");
718 }
719
720 /*
721 * Describe the mount options on this VFS mountpoint
722 */
723 static int nfs_show_options(struct seq_file *m, struct dentry *root)
724 {
725 struct nfs_server *nfss = NFS_SB(root->d_sb);
726
727 nfs_show_mount_options(m, nfss, 0);
728
729 seq_printf(m, ",addr=%s",
730 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
731 RPC_DISPLAY_ADDR));
732
733 return 0;
734 }
735
736 #ifdef CONFIG_NFS_V4
737 #ifdef CONFIG_NFS_V4_1
738 static void show_sessions(struct seq_file *m, struct nfs_server *server)
739 {
740 if (nfs4_has_session(server->nfs_client))
741 seq_printf(m, ",sessions");
742 }
743 #else
744 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
745 #endif
746 #endif
747
748 #ifdef CONFIG_NFS_V4
749 #ifdef CONFIG_NFS_V4_1
750 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
751 {
752 seq_printf(m, ",pnfs=");
753 if (server->pnfs_curr_ld)
754 seq_printf(m, "%s", server->pnfs_curr_ld->name);
755 else
756 seq_printf(m, "not configured");
757 }
758 #else
759 static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
760 #endif
761 #endif
762
763 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
764 {
765 char *page = (char *) __get_free_page(GFP_KERNEL);
766 char *devname, *dummy;
767 int err = 0;
768 if (!page)
769 return -ENOMEM;
770 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
771 if (IS_ERR(devname))
772 err = PTR_ERR(devname);
773 else
774 seq_escape(m, devname, " \t\n\\");
775 free_page((unsigned long)page);
776 return err;
777 }
778
779 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
780 {
781 seq_puts(m, "/");
782 return 0;
783 }
784
785 /*
786 * Present statistical information for this VFS mountpoint
787 */
788 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
789 {
790 int i, cpu;
791 struct nfs_server *nfss = NFS_SB(root->d_sb);
792 struct rpc_auth *auth = nfss->client->cl_auth;
793 struct nfs_iostats totals = { };
794
795 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
796
797 /*
798 * Display all mount option settings
799 */
800 seq_printf(m, "\n\topts:\t");
801 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
802 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
803 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
804 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
805 nfs_show_mount_options(m, nfss, 1);
806
807 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
808
809 seq_printf(m, "\n\tcaps:\t");
810 seq_printf(m, "caps=0x%x", nfss->caps);
811 seq_printf(m, ",wtmult=%u", nfss->wtmult);
812 seq_printf(m, ",dtsize=%u", nfss->dtsize);
813 seq_printf(m, ",bsize=%u", nfss->bsize);
814 seq_printf(m, ",namlen=%u", nfss->namelen);
815
816 #ifdef CONFIG_NFS_V4
817 if (nfss->nfs_client->rpc_ops->version == 4) {
818 seq_printf(m, "\n\tnfsv4:\t");
819 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
820 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
821 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
822 show_sessions(m, nfss);
823 show_pnfs(m, nfss);
824 }
825 #endif
826
827 /*
828 * Display security flavor in effect for this mount
829 */
830 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
831 if (auth->au_flavor)
832 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
833
834 /*
835 * Display superblock I/O counters
836 */
837 for_each_possible_cpu(cpu) {
838 struct nfs_iostats *stats;
839
840 preempt_disable();
841 stats = per_cpu_ptr(nfss->io_stats, cpu);
842
843 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
844 totals.events[i] += stats->events[i];
845 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
846 totals.bytes[i] += stats->bytes[i];
847 #ifdef CONFIG_NFS_FSCACHE
848 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
849 totals.fscache[i] += stats->fscache[i];
850 #endif
851
852 preempt_enable();
853 }
854
855 seq_printf(m, "\n\tevents:\t");
856 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
857 seq_printf(m, "%lu ", totals.events[i]);
858 seq_printf(m, "\n\tbytes:\t");
859 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
860 seq_printf(m, "%Lu ", totals.bytes[i]);
861 #ifdef CONFIG_NFS_FSCACHE
862 if (nfss->options & NFS_OPTION_FSCACHE) {
863 seq_printf(m, "\n\tfsc:\t");
864 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
865 seq_printf(m, "%Lu ", totals.bytes[i]);
866 }
867 #endif
868 seq_printf(m, "\n");
869
870 rpc_print_iostats(m, nfss->client);
871
872 return 0;
873 }
874
875 /*
876 * Begin unmount by attempting to remove all automounted mountpoints we added
877 * in response to xdev traversals and referrals
878 */
879 static void nfs_umount_begin(struct super_block *sb)
880 {
881 struct nfs_server *server;
882 struct rpc_clnt *rpc;
883
884 server = NFS_SB(sb);
885 /* -EIO all pending I/O */
886 rpc = server->client_acl;
887 if (!IS_ERR(rpc))
888 rpc_killall_tasks(rpc);
889 rpc = server->client;
890 if (!IS_ERR(rpc))
891 rpc_killall_tasks(rpc);
892 }
893
894 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
895 {
896 struct nfs_parsed_mount_data *data;
897
898 data = kzalloc(sizeof(*data), GFP_KERNEL);
899 if (data) {
900 data->acregmin = NFS_DEF_ACREGMIN;
901 data->acregmax = NFS_DEF_ACREGMAX;
902 data->acdirmin = NFS_DEF_ACDIRMIN;
903 data->acdirmax = NFS_DEF_ACDIRMAX;
904 data->mount_server.port = NFS_UNSPEC_PORT;
905 data->nfs_server.port = NFS_UNSPEC_PORT;
906 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
907 data->auth_flavors[0] = RPC_AUTH_UNIX;
908 data->auth_flavor_len = 1;
909 data->version = version;
910 data->minorversion = 0;
911 security_init_mnt_opts(&data->lsm_opts);
912 }
913 return data;
914 }
915
916 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
917 {
918 if (data) {
919 kfree(data->client_address);
920 kfree(data->mount_server.hostname);
921 kfree(data->nfs_server.export_path);
922 kfree(data->nfs_server.hostname);
923 kfree(data->fscache_uniq);
924 security_free_mnt_opts(&data->lsm_opts);
925 kfree(data);
926 }
927 }
928
929 /*
930 * Sanity-check a server address provided by the mount command.
931 *
932 * Address family must be initialized, and address must not be
933 * the ANY address for that family.
934 */
935 static int nfs_verify_server_address(struct sockaddr *addr)
936 {
937 switch (addr->sa_family) {
938 case AF_INET: {
939 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
940 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
941 }
942 case AF_INET6: {
943 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
944 return !ipv6_addr_any(sa);
945 }
946 }
947
948 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
949 return 0;
950 }
951
952 /*
953 * Select between a default port value and a user-specified port value.
954 * If a zero value is set, then autobind will be used.
955 */
956 static void nfs_set_port(struct sockaddr *sap, int *port,
957 const unsigned short default_port)
958 {
959 if (*port == NFS_UNSPEC_PORT)
960 *port = default_port;
961
962 rpc_set_port(sap, *port);
963 }
964
965 /*
966 * Sanity check the NFS transport protocol.
967 *
968 */
969 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
970 {
971 switch (mnt->nfs_server.protocol) {
972 case XPRT_TRANSPORT_UDP:
973 case XPRT_TRANSPORT_TCP:
974 case XPRT_TRANSPORT_RDMA:
975 break;
976 default:
977 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
978 }
979 }
980
981 /*
982 * For text based NFSv2/v3 mounts, the mount protocol transport default
983 * settings should depend upon the specified NFS transport.
984 */
985 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
986 {
987 nfs_validate_transport_protocol(mnt);
988
989 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
990 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
991 return;
992 switch (mnt->nfs_server.protocol) {
993 case XPRT_TRANSPORT_UDP:
994 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
995 break;
996 case XPRT_TRANSPORT_TCP:
997 case XPRT_TRANSPORT_RDMA:
998 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
999 }
1000 }
1001
1002 /*
1003 * Parse the value of the 'sec=' option.
1004 */
1005 static int nfs_parse_security_flavors(char *value,
1006 struct nfs_parsed_mount_data *mnt)
1007 {
1008 substring_t args[MAX_OPT_ARGS];
1009
1010 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1011
1012 switch (match_token(value, nfs_secflavor_tokens, args)) {
1013 case Opt_sec_none:
1014 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1015 break;
1016 case Opt_sec_sys:
1017 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1018 break;
1019 case Opt_sec_krb5:
1020 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1021 break;
1022 case Opt_sec_krb5i:
1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1024 break;
1025 case Opt_sec_krb5p:
1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1027 break;
1028 case Opt_sec_lkey:
1029 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1030 break;
1031 case Opt_sec_lkeyi:
1032 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1033 break;
1034 case Opt_sec_lkeyp:
1035 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1036 break;
1037 case Opt_sec_spkm:
1038 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1039 break;
1040 case Opt_sec_spkmi:
1041 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1042 break;
1043 case Opt_sec_spkmp:
1044 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1045 break;
1046 default:
1047 return 0;
1048 }
1049
1050 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1051 mnt->auth_flavor_len = 1;
1052 return 1;
1053 }
1054
1055 static int nfs_get_option_str(substring_t args[], char **option)
1056 {
1057 kfree(*option);
1058 *option = match_strdup(args);
1059 return !option;
1060 }
1061
1062 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1063 {
1064 int rc;
1065 char *string;
1066
1067 string = match_strdup(args);
1068 if (string == NULL)
1069 return -ENOMEM;
1070 rc = strict_strtoul(string, 10, option);
1071 kfree(string);
1072
1073 return rc;
1074 }
1075
1076 /*
1077 * Error-check and convert a string of mount options from user space into
1078 * a data structure. The whole mount string is processed; bad options are
1079 * skipped as they are encountered. If there were no errors, return 1;
1080 * otherwise return 0 (zero).
1081 */
1082 static int nfs_parse_mount_options(char *raw,
1083 struct nfs_parsed_mount_data *mnt)
1084 {
1085 char *p, *string, *secdata;
1086 int rc, sloppy = 0, invalid_option = 0;
1087 unsigned short protofamily = AF_UNSPEC;
1088 unsigned short mountfamily = AF_UNSPEC;
1089
1090 if (!raw) {
1091 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1092 return 1;
1093 }
1094 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1095
1096 secdata = alloc_secdata();
1097 if (!secdata)
1098 goto out_nomem;
1099
1100 rc = security_sb_copy_data(raw, secdata);
1101 if (rc)
1102 goto out_security_failure;
1103
1104 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1105 if (rc)
1106 goto out_security_failure;
1107
1108 free_secdata(secdata);
1109
1110 while ((p = strsep(&raw, ",")) != NULL) {
1111 substring_t args[MAX_OPT_ARGS];
1112 unsigned long option;
1113 int token;
1114
1115 if (!*p)
1116 continue;
1117
1118 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1119
1120 token = match_token(p, nfs_mount_option_tokens, args);
1121 switch (token) {
1122
1123 /*
1124 * boolean options: foo/nofoo
1125 */
1126 case Opt_soft:
1127 mnt->flags |= NFS_MOUNT_SOFT;
1128 break;
1129 case Opt_hard:
1130 mnt->flags &= ~NFS_MOUNT_SOFT;
1131 break;
1132 case Opt_posix:
1133 mnt->flags |= NFS_MOUNT_POSIX;
1134 break;
1135 case Opt_noposix:
1136 mnt->flags &= ~NFS_MOUNT_POSIX;
1137 break;
1138 case Opt_cto:
1139 mnt->flags &= ~NFS_MOUNT_NOCTO;
1140 break;
1141 case Opt_nocto:
1142 mnt->flags |= NFS_MOUNT_NOCTO;
1143 break;
1144 case Opt_ac:
1145 mnt->flags &= ~NFS_MOUNT_NOAC;
1146 break;
1147 case Opt_noac:
1148 mnt->flags |= NFS_MOUNT_NOAC;
1149 break;
1150 case Opt_lock:
1151 mnt->flags &= ~NFS_MOUNT_NONLM;
1152 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1153 NFS_MOUNT_LOCAL_FCNTL);
1154 break;
1155 case Opt_nolock:
1156 mnt->flags |= NFS_MOUNT_NONLM;
1157 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1158 NFS_MOUNT_LOCAL_FCNTL);
1159 break;
1160 case Opt_v2:
1161 mnt->flags &= ~NFS_MOUNT_VER3;
1162 mnt->version = 2;
1163 break;
1164 case Opt_v3:
1165 mnt->flags |= NFS_MOUNT_VER3;
1166 mnt->version = 3;
1167 break;
1168 case Opt_v4:
1169 mnt->flags &= ~NFS_MOUNT_VER3;
1170 mnt->version = 4;
1171 break;
1172 case Opt_udp:
1173 mnt->flags &= ~NFS_MOUNT_TCP;
1174 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1175 break;
1176 case Opt_tcp:
1177 mnt->flags |= NFS_MOUNT_TCP;
1178 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1179 break;
1180 case Opt_rdma:
1181 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1182 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1183 xprt_load_transport(p);
1184 break;
1185 case Opt_acl:
1186 mnt->flags &= ~NFS_MOUNT_NOACL;
1187 break;
1188 case Opt_noacl:
1189 mnt->flags |= NFS_MOUNT_NOACL;
1190 break;
1191 case Opt_rdirplus:
1192 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1193 break;
1194 case Opt_nordirplus:
1195 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1196 break;
1197 case Opt_sharecache:
1198 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1199 break;
1200 case Opt_nosharecache:
1201 mnt->flags |= NFS_MOUNT_UNSHARED;
1202 break;
1203 case Opt_resvport:
1204 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1205 break;
1206 case Opt_noresvport:
1207 mnt->flags |= NFS_MOUNT_NORESVPORT;
1208 break;
1209 case Opt_fscache:
1210 mnt->options |= NFS_OPTION_FSCACHE;
1211 kfree(mnt->fscache_uniq);
1212 mnt->fscache_uniq = NULL;
1213 break;
1214 case Opt_nofscache:
1215 mnt->options &= ~NFS_OPTION_FSCACHE;
1216 kfree(mnt->fscache_uniq);
1217 mnt->fscache_uniq = NULL;
1218 break;
1219
1220 /*
1221 * options that take numeric values
1222 */
1223 case Opt_port:
1224 if (nfs_get_option_ul(args, &option) ||
1225 option > USHRT_MAX)
1226 goto out_invalid_value;
1227 mnt->nfs_server.port = option;
1228 break;
1229 case Opt_rsize:
1230 if (nfs_get_option_ul(args, &option))
1231 goto out_invalid_value;
1232 mnt->rsize = option;
1233 break;
1234 case Opt_wsize:
1235 if (nfs_get_option_ul(args, &option))
1236 goto out_invalid_value;
1237 mnt->wsize = option;
1238 break;
1239 case Opt_bsize:
1240 if (nfs_get_option_ul(args, &option))
1241 goto out_invalid_value;
1242 mnt->bsize = option;
1243 break;
1244 case Opt_timeo:
1245 if (nfs_get_option_ul(args, &option) || option == 0)
1246 goto out_invalid_value;
1247 mnt->timeo = option;
1248 break;
1249 case Opt_retrans:
1250 if (nfs_get_option_ul(args, &option) || option == 0)
1251 goto out_invalid_value;
1252 mnt->retrans = option;
1253 break;
1254 case Opt_acregmin:
1255 if (nfs_get_option_ul(args, &option))
1256 goto out_invalid_value;
1257 mnt->acregmin = option;
1258 break;
1259 case Opt_acregmax:
1260 if (nfs_get_option_ul(args, &option))
1261 goto out_invalid_value;
1262 mnt->acregmax = option;
1263 break;
1264 case Opt_acdirmin:
1265 if (nfs_get_option_ul(args, &option))
1266 goto out_invalid_value;
1267 mnt->acdirmin = option;
1268 break;
1269 case Opt_acdirmax:
1270 if (nfs_get_option_ul(args, &option))
1271 goto out_invalid_value;
1272 mnt->acdirmax = option;
1273 break;
1274 case Opt_actimeo:
1275 if (nfs_get_option_ul(args, &option))
1276 goto out_invalid_value;
1277 mnt->acregmin = mnt->acregmax =
1278 mnt->acdirmin = mnt->acdirmax = option;
1279 break;
1280 case Opt_namelen:
1281 if (nfs_get_option_ul(args, &option))
1282 goto out_invalid_value;
1283 mnt->namlen = option;
1284 break;
1285 case Opt_mountport:
1286 if (nfs_get_option_ul(args, &option) ||
1287 option > USHRT_MAX)
1288 goto out_invalid_value;
1289 mnt->mount_server.port = option;
1290 break;
1291 case Opt_mountvers:
1292 if (nfs_get_option_ul(args, &option) ||
1293 option < NFS_MNT_VERSION ||
1294 option > NFS_MNT3_VERSION)
1295 goto out_invalid_value;
1296 mnt->mount_server.version = option;
1297 break;
1298 case Opt_nfsvers:
1299 if (nfs_get_option_ul(args, &option))
1300 goto out_invalid_value;
1301 switch (option) {
1302 case NFS2_VERSION:
1303 mnt->flags &= ~NFS_MOUNT_VER3;
1304 mnt->version = 2;
1305 break;
1306 case NFS3_VERSION:
1307 mnt->flags |= NFS_MOUNT_VER3;
1308 mnt->version = 3;
1309 break;
1310 case NFS4_VERSION:
1311 mnt->flags &= ~NFS_MOUNT_VER3;
1312 mnt->version = 4;
1313 break;
1314 default:
1315 goto out_invalid_value;
1316 }
1317 break;
1318 case Opt_minorversion:
1319 if (nfs_get_option_ul(args, &option))
1320 goto out_invalid_value;
1321 if (option > NFS4_MAX_MINOR_VERSION)
1322 goto out_invalid_value;
1323 mnt->minorversion = option;
1324 break;
1325
1326 /*
1327 * options that take text values
1328 */
1329 case Opt_sec:
1330 string = match_strdup(args);
1331 if (string == NULL)
1332 goto out_nomem;
1333 rc = nfs_parse_security_flavors(string, mnt);
1334 kfree(string);
1335 if (!rc) {
1336 dfprintk(MOUNT, "NFS: unrecognized "
1337 "security flavor\n");
1338 return 0;
1339 }
1340 break;
1341 case Opt_proto:
1342 string = match_strdup(args);
1343 if (string == NULL)
1344 goto out_nomem;
1345 token = match_token(string,
1346 nfs_xprt_protocol_tokens, args);
1347
1348 protofamily = AF_INET;
1349 switch (token) {
1350 case Opt_xprt_udp6:
1351 protofamily = AF_INET6;
1352 case Opt_xprt_udp:
1353 mnt->flags &= ~NFS_MOUNT_TCP;
1354 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1355 break;
1356 case Opt_xprt_tcp6:
1357 protofamily = AF_INET6;
1358 case Opt_xprt_tcp:
1359 mnt->flags |= NFS_MOUNT_TCP;
1360 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1361 break;
1362 case Opt_xprt_rdma:
1363 /* vector side protocols to TCP */
1364 mnt->flags |= NFS_MOUNT_TCP;
1365 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1366 xprt_load_transport(string);
1367 break;
1368 default:
1369 dfprintk(MOUNT, "NFS: unrecognized "
1370 "transport protocol\n");
1371 kfree(string);
1372 return 0;
1373 }
1374 kfree(string);
1375 break;
1376 case Opt_mountproto:
1377 string = match_strdup(args);
1378 if (string == NULL)
1379 goto out_nomem;
1380 token = match_token(string,
1381 nfs_xprt_protocol_tokens, args);
1382 kfree(string);
1383
1384 mountfamily = AF_INET;
1385 switch (token) {
1386 case Opt_xprt_udp6:
1387 mountfamily = AF_INET6;
1388 case Opt_xprt_udp:
1389 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1390 break;
1391 case Opt_xprt_tcp6:
1392 mountfamily = AF_INET6;
1393 case Opt_xprt_tcp:
1394 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1395 break;
1396 case Opt_xprt_rdma: /* not used for side protocols */
1397 default:
1398 dfprintk(MOUNT, "NFS: unrecognized "
1399 "transport protocol\n");
1400 return 0;
1401 }
1402 break;
1403 case Opt_addr:
1404 string = match_strdup(args);
1405 if (string == NULL)
1406 goto out_nomem;
1407 mnt->nfs_server.addrlen =
1408 rpc_pton(string, strlen(string),
1409 (struct sockaddr *)
1410 &mnt->nfs_server.address,
1411 sizeof(mnt->nfs_server.address));
1412 kfree(string);
1413 if (mnt->nfs_server.addrlen == 0)
1414 goto out_invalid_address;
1415 break;
1416 case Opt_clientaddr:
1417 if (nfs_get_option_str(args, &mnt->client_address))
1418 goto out_nomem;
1419 break;
1420 case Opt_mounthost:
1421 if (nfs_get_option_str(args,
1422 &mnt->mount_server.hostname))
1423 goto out_nomem;
1424 break;
1425 case Opt_mountaddr:
1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
1429 mnt->mount_server.addrlen =
1430 rpc_pton(string, strlen(string),
1431 (struct sockaddr *)
1432 &mnt->mount_server.address,
1433 sizeof(mnt->mount_server.address));
1434 kfree(string);
1435 if (mnt->mount_server.addrlen == 0)
1436 goto out_invalid_address;
1437 break;
1438 case Opt_lookupcache:
1439 string = match_strdup(args);
1440 if (string == NULL)
1441 goto out_nomem;
1442 token = match_token(string,
1443 nfs_lookupcache_tokens, args);
1444 kfree(string);
1445 switch (token) {
1446 case Opt_lookupcache_all:
1447 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1448 break;
1449 case Opt_lookupcache_positive:
1450 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1451 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1452 break;
1453 case Opt_lookupcache_none:
1454 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1455 break;
1456 default:
1457 dfprintk(MOUNT, "NFS: invalid "
1458 "lookupcache argument\n");
1459 return 0;
1460 };
1461 break;
1462 case Opt_fscache_uniq:
1463 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1464 goto out_nomem;
1465 mnt->options |= NFS_OPTION_FSCACHE;
1466 break;
1467 case Opt_local_lock:
1468 string = match_strdup(args);
1469 if (string == NULL)
1470 goto out_nomem;
1471 token = match_token(string, nfs_local_lock_tokens,
1472 args);
1473 kfree(string);
1474 switch (token) {
1475 case Opt_local_lock_all:
1476 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1477 NFS_MOUNT_LOCAL_FCNTL);
1478 break;
1479 case Opt_local_lock_flock:
1480 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1481 break;
1482 case Opt_local_lock_posix:
1483 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1484 break;
1485 case Opt_local_lock_none:
1486 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1487 NFS_MOUNT_LOCAL_FCNTL);
1488 break;
1489 default:
1490 dfprintk(MOUNT, "NFS: invalid "
1491 "local_lock argument\n");
1492 return 0;
1493 };
1494 break;
1495
1496 /*
1497 * Special options
1498 */
1499 case Opt_sloppy:
1500 sloppy = 1;
1501 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1502 break;
1503 case Opt_userspace:
1504 case Opt_deprecated:
1505 dfprintk(MOUNT, "NFS: ignoring mount option "
1506 "'%s'\n", p);
1507 break;
1508
1509 default:
1510 invalid_option = 1;
1511 dfprintk(MOUNT, "NFS: unrecognized mount option "
1512 "'%s'\n", p);
1513 }
1514 }
1515
1516 if (!sloppy && invalid_option)
1517 return 0;
1518
1519 /*
1520 * verify that any proto=/mountproto= options match the address
1521 * familiies in the addr=/mountaddr= options.
1522 */
1523 if (protofamily != AF_UNSPEC &&
1524 protofamily != mnt->nfs_server.address.ss_family)
1525 goto out_proto_mismatch;
1526
1527 if (mountfamily != AF_UNSPEC) {
1528 if (mnt->mount_server.addrlen) {
1529 if (mountfamily != mnt->mount_server.address.ss_family)
1530 goto out_mountproto_mismatch;
1531 } else {
1532 if (mountfamily != mnt->nfs_server.address.ss_family)
1533 goto out_mountproto_mismatch;
1534 }
1535 }
1536
1537 return 1;
1538
1539 out_mountproto_mismatch:
1540 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1541 "option\n");
1542 return 0;
1543 out_proto_mismatch:
1544 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1545 return 0;
1546 out_invalid_address:
1547 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1548 return 0;
1549 out_invalid_value:
1550 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1551 return 0;
1552 out_nomem:
1553 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1554 return 0;
1555 out_security_failure:
1556 free_secdata(secdata);
1557 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1558 return 0;
1559 }
1560
1561 /*
1562 * Match the requested auth flavors with the list returned by
1563 * the server. Returns zero and sets the mount's authentication
1564 * flavor on success; returns -EACCES if server does not support
1565 * the requested flavor.
1566 */
1567 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1568 struct nfs_mount_request *request)
1569 {
1570 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1571
1572 /*
1573 * Certain releases of Linux's mountd return an empty
1574 * flavor list. To prevent behavioral regression with
1575 * these servers (ie. rejecting mounts that used to
1576 * succeed), revert to pre-2.6.32 behavior (no checking)
1577 * if the returned flavor list is empty.
1578 */
1579 if (server_authlist_len == 0)
1580 return 0;
1581
1582 /*
1583 * We avoid sophisticated negotiating here, as there are
1584 * plenty of cases where we can get it wrong, providing
1585 * either too little or too much security.
1586 *
1587 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1588 * flavor listed first. However, some servers list
1589 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1590 * preferred default, in args->auth_flavors[0] if user
1591 * didn't specify sec= mount option.
1592 */
1593 for (i = 0; i < args->auth_flavor_len; i++)
1594 for (j = 0; j < server_authlist_len; j++)
1595 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1596 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1597 request->auth_flavs[j]);
1598 args->auth_flavors[0] = request->auth_flavs[j];
1599 return 0;
1600 }
1601
1602 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1603 nfs_umount(request);
1604 return -EACCES;
1605 }
1606
1607 /*
1608 * Use the remote server's MOUNT service to request the NFS file handle
1609 * corresponding to the provided path.
1610 */
1611 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1612 struct nfs_fh *root_fh)
1613 {
1614 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1615 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1616 struct nfs_mount_request request = {
1617 .sap = (struct sockaddr *)
1618 &args->mount_server.address,
1619 .dirpath = args->nfs_server.export_path,
1620 .protocol = args->mount_server.protocol,
1621 .fh = root_fh,
1622 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1623 .auth_flav_len = &server_authlist_len,
1624 .auth_flavs = server_authlist,
1625 };
1626 int status;
1627
1628 if (args->mount_server.version == 0) {
1629 switch (args->version) {
1630 default:
1631 args->mount_server.version = NFS_MNT3_VERSION;
1632 break;
1633 case 2:
1634 args->mount_server.version = NFS_MNT_VERSION;
1635 }
1636 }
1637 request.version = args->mount_server.version;
1638
1639 if (args->mount_server.hostname)
1640 request.hostname = args->mount_server.hostname;
1641 else
1642 request.hostname = args->nfs_server.hostname;
1643
1644 /*
1645 * Construct the mount server's address.
1646 */
1647 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1648 memcpy(request.sap, &args->nfs_server.address,
1649 args->nfs_server.addrlen);
1650 args->mount_server.addrlen = args->nfs_server.addrlen;
1651 }
1652 request.salen = args->mount_server.addrlen;
1653 nfs_set_port(request.sap, &args->mount_server.port, 0);
1654
1655 /*
1656 * Now ask the mount server to map our export path
1657 * to a file handle.
1658 */
1659 status = nfs_mount(&request);
1660 if (status != 0) {
1661 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1662 request.hostname, status);
1663 return status;
1664 }
1665
1666 /*
1667 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1668 */
1669 if (args->mount_server.version != NFS_MNT3_VERSION)
1670 return 0;
1671 return nfs_walk_authlist(args, &request);
1672 }
1673
1674 /*
1675 * Split "dev_name" into "hostname:export_path".
1676 *
1677 * The leftmost colon demarks the split between the server's hostname
1678 * and the export path. If the hostname starts with a left square
1679 * bracket, then it may contain colons.
1680 *
1681 * Note: caller frees hostname and export path, even on error.
1682 */
1683 static int nfs_parse_devname(const char *dev_name,
1684 char **hostname, size_t maxnamlen,
1685 char **export_path, size_t maxpathlen)
1686 {
1687 size_t len;
1688 char *end;
1689
1690 /* Is the host name protected with square brakcets? */
1691 if (*dev_name == '[') {
1692 end = strchr(++dev_name, ']');
1693 if (end == NULL || end[1] != ':')
1694 goto out_bad_devname;
1695
1696 len = end - dev_name;
1697 end++;
1698 } else {
1699 char *comma;
1700
1701 end = strchr(dev_name, ':');
1702 if (end == NULL)
1703 goto out_bad_devname;
1704 len = end - dev_name;
1705
1706 /* kill possible hostname list: not supported */
1707 comma = strchr(dev_name, ',');
1708 if (comma != NULL && comma < end)
1709 *comma = 0;
1710 }
1711
1712 if (len > maxnamlen)
1713 goto out_hostname;
1714
1715 /* N.B. caller will free nfs_server.hostname in all cases */
1716 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1717 if (*hostname == NULL)
1718 goto out_nomem;
1719 len = strlen(++end);
1720 if (len > maxpathlen)
1721 goto out_path;
1722 *export_path = kstrndup(end, len, GFP_KERNEL);
1723 if (!*export_path)
1724 goto out_nomem;
1725
1726 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1727 return 0;
1728
1729 out_bad_devname:
1730 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1731 return -EINVAL;
1732
1733 out_nomem:
1734 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1735 return -ENOMEM;
1736
1737 out_hostname:
1738 dfprintk(MOUNT, "NFS: server hostname too long\n");
1739 return -ENAMETOOLONG;
1740
1741 out_path:
1742 dfprintk(MOUNT, "NFS: export pathname too long\n");
1743 return -ENAMETOOLONG;
1744 }
1745
1746 /*
1747 * Validate the NFS2/NFS3 mount data
1748 * - fills in the mount root filehandle
1749 *
1750 * For option strings, user space handles the following behaviors:
1751 *
1752 * + DNS: mapping server host name to IP address ("addr=" option)
1753 *
1754 * + failure mode: how to behave if a mount request can't be handled
1755 * immediately ("fg/bg" option)
1756 *
1757 * + retry: how often to retry a mount request ("retry=" option)
1758 *
1759 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1760 * mountproto=tcp after mountproto=udp, and so on
1761 */
1762 static int nfs_validate_mount_data(void *options,
1763 struct nfs_parsed_mount_data *args,
1764 struct nfs_fh *mntfh,
1765 const char *dev_name)
1766 {
1767 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1768 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1769
1770 if (data == NULL)
1771 goto out_no_data;
1772
1773 switch (data->version) {
1774 case 1:
1775 data->namlen = 0;
1776 case 2:
1777 data->bsize = 0;
1778 case 3:
1779 if (data->flags & NFS_MOUNT_VER3)
1780 goto out_no_v3;
1781 data->root.size = NFS2_FHSIZE;
1782 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1783 case 4:
1784 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1785 goto out_no_sec;
1786 case 5:
1787 memset(data->context, 0, sizeof(data->context));
1788 case 6:
1789 if (data->flags & NFS_MOUNT_VER3) {
1790 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1791 goto out_invalid_fh;
1792 mntfh->size = data->root.size;
1793 args->version = 3;
1794 } else {
1795 mntfh->size = NFS2_FHSIZE;
1796 args->version = 2;
1797 }
1798
1799
1800 memcpy(mntfh->data, data->root.data, mntfh->size);
1801 if (mntfh->size < sizeof(mntfh->data))
1802 memset(mntfh->data + mntfh->size, 0,
1803 sizeof(mntfh->data) - mntfh->size);
1804
1805 /*
1806 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1807 * can deal with.
1808 */
1809 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1810 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1811 args->rsize = data->rsize;
1812 args->wsize = data->wsize;
1813 args->timeo = data->timeo;
1814 args->retrans = data->retrans;
1815 args->acregmin = data->acregmin;
1816 args->acregmax = data->acregmax;
1817 args->acdirmin = data->acdirmin;
1818 args->acdirmax = data->acdirmax;
1819
1820 memcpy(sap, &data->addr, sizeof(data->addr));
1821 args->nfs_server.addrlen = sizeof(data->addr);
1822 if (!nfs_verify_server_address(sap))
1823 goto out_no_address;
1824
1825 if (!(data->flags & NFS_MOUNT_TCP))
1826 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1827 /* N.B. caller will free nfs_server.hostname in all cases */
1828 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1829 args->namlen = data->namlen;
1830 args->bsize = data->bsize;
1831
1832 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1833 args->auth_flavors[0] = data->pseudoflavor;
1834 if (!args->nfs_server.hostname)
1835 goto out_nomem;
1836
1837 if (!(data->flags & NFS_MOUNT_NONLM))
1838 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1839 NFS_MOUNT_LOCAL_FCNTL);
1840 else
1841 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1842 NFS_MOUNT_LOCAL_FCNTL);
1843 /*
1844 * The legacy version 6 binary mount data from userspace has a
1845 * field used only to transport selinux information into the
1846 * the kernel. To continue to support that functionality we
1847 * have a touch of selinux knowledge here in the NFS code. The
1848 * userspace code converted context=blah to just blah so we are
1849 * converting back to the full string selinux understands.
1850 */
1851 if (data->context[0]){
1852 #ifdef CONFIG_SECURITY_SELINUX
1853 int rc;
1854 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1855 if (!opts_str)
1856 return -ENOMEM;
1857 strcpy(opts_str, "context=");
1858 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1859 strcat(opts_str, &data->context[0]);
1860 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1861 kfree(opts_str);
1862 if (rc)
1863 return rc;
1864 #else
1865 return -EINVAL;
1866 #endif
1867 }
1868
1869 break;
1870 default: {
1871 int status;
1872
1873 if (nfs_parse_mount_options((char *)options, args) == 0)
1874 return -EINVAL;
1875
1876 if (!nfs_verify_server_address(sap))
1877 goto out_no_address;
1878
1879 if (args->version == 4)
1880 #ifdef CONFIG_NFS_V4
1881 return nfs4_validate_text_mount_data(options,
1882 args, dev_name);
1883 #else
1884 goto out_v4_not_compiled;
1885 #endif
1886
1887 nfs_set_port(sap, &args->nfs_server.port, 0);
1888
1889 nfs_set_mount_transport_protocol(args);
1890
1891 status = nfs_parse_devname(dev_name,
1892 &args->nfs_server.hostname,
1893 PAGE_SIZE,
1894 &args->nfs_server.export_path,
1895 NFS_MAXPATHLEN);
1896 if (!status)
1897 status = nfs_try_mount(args, mntfh);
1898
1899 kfree(args->nfs_server.export_path);
1900 args->nfs_server.export_path = NULL;
1901
1902 if (status)
1903 return status;
1904
1905 break;
1906 }
1907 }
1908
1909 #ifndef CONFIG_NFS_V3
1910 if (args->version == 3)
1911 goto out_v3_not_compiled;
1912 #endif /* !CONFIG_NFS_V3 */
1913
1914 return 0;
1915
1916 out_no_data:
1917 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1918 return -EINVAL;
1919
1920 out_no_v3:
1921 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1922 data->version);
1923 return -EINVAL;
1924
1925 out_no_sec:
1926 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1927 return -EINVAL;
1928
1929 #ifndef CONFIG_NFS_V3
1930 out_v3_not_compiled:
1931 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1932 return -EPROTONOSUPPORT;
1933 #endif /* !CONFIG_NFS_V3 */
1934
1935 #ifndef CONFIG_NFS_V4
1936 out_v4_not_compiled:
1937 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1938 return -EPROTONOSUPPORT;
1939 #endif /* !CONFIG_NFS_V4 */
1940
1941 out_nomem:
1942 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1943 return -ENOMEM;
1944
1945 out_no_address:
1946 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1947 return -EINVAL;
1948
1949 out_invalid_fh:
1950 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1951 return -EINVAL;
1952 }
1953
1954 static int
1955 nfs_compare_remount_data(struct nfs_server *nfss,
1956 struct nfs_parsed_mount_data *data)
1957 {
1958 if (data->flags != nfss->flags ||
1959 data->rsize != nfss->rsize ||
1960 data->wsize != nfss->wsize ||
1961 data->retrans != nfss->client->cl_timeout->to_retries ||
1962 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1963 data->acregmin != nfss->acregmin / HZ ||
1964 data->acregmax != nfss->acregmax / HZ ||
1965 data->acdirmin != nfss->acdirmin / HZ ||
1966 data->acdirmax != nfss->acdirmax / HZ ||
1967 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1968 data->nfs_server.port != nfss->port ||
1969 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1970 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1971 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1972 return -EINVAL;
1973
1974 return 0;
1975 }
1976
1977 static int
1978 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1979 {
1980 int error;
1981 struct nfs_server *nfss = sb->s_fs_info;
1982 struct nfs_parsed_mount_data *data;
1983 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1984 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1985 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1986
1987 /*
1988 * Userspace mount programs that send binary options generally send
1989 * them populated with default values. We have no way to know which
1990 * ones were explicitly specified. Fall back to legacy behavior and
1991 * just return success.
1992 */
1993 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1994 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1995 options->version <= 6))))
1996 return 0;
1997
1998 data = kzalloc(sizeof(*data), GFP_KERNEL);
1999 if (data == NULL)
2000 return -ENOMEM;
2001
2002 /* fill out struct with values from existing mount */
2003 data->flags = nfss->flags;
2004 data->rsize = nfss->rsize;
2005 data->wsize = nfss->wsize;
2006 data->retrans = nfss->client->cl_timeout->to_retries;
2007 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2008 data->acregmin = nfss->acregmin / HZ;
2009 data->acregmax = nfss->acregmax / HZ;
2010 data->acdirmin = nfss->acdirmin / HZ;
2011 data->acdirmax = nfss->acdirmax / HZ;
2012 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2013 data->nfs_server.port = nfss->port;
2014 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2015 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2016 data->nfs_server.addrlen);
2017
2018 /* overwrite those values with any that were specified */
2019 error = nfs_parse_mount_options((char *)options, data);
2020 if (error < 0)
2021 goto out;
2022
2023 /*
2024 * noac is a special case. It implies -o sync, but that's not
2025 * necessarily reflected in the mtab options. do_remount_sb
2026 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2027 * remount options, so we have to explicitly reset it.
2028 */
2029 if (data->flags & NFS_MOUNT_NOAC)
2030 *flags |= MS_SYNCHRONOUS;
2031
2032 /* compare new mount options with old ones */
2033 error = nfs_compare_remount_data(nfss, data);
2034 out:
2035 kfree(data);
2036 return error;
2037 }
2038
2039 /*
2040 * Initialise the common bits of the superblock
2041 */
2042 static inline void nfs_initialise_sb(struct super_block *sb)
2043 {
2044 struct nfs_server *server = NFS_SB(sb);
2045
2046 sb->s_magic = NFS_SUPER_MAGIC;
2047
2048 /* We probably want something more informative here */
2049 snprintf(sb->s_id, sizeof(sb->s_id),
2050 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2051
2052 if (sb->s_blocksize == 0)
2053 sb->s_blocksize = nfs_block_bits(server->wsize,
2054 &sb->s_blocksize_bits);
2055
2056 sb->s_bdi = &server->backing_dev_info;
2057
2058 nfs_super_set_maxbytes(sb, server->maxfilesize);
2059 }
2060
2061 /*
2062 * Finish setting up an NFS2/3 superblock
2063 */
2064 static void nfs_fill_super(struct super_block *sb,
2065 struct nfs_parsed_mount_data *data)
2066 {
2067 struct nfs_server *server = NFS_SB(sb);
2068
2069 sb->s_blocksize_bits = 0;
2070 sb->s_blocksize = 0;
2071 if (data->bsize)
2072 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2073
2074 if (server->nfs_client->rpc_ops->version == 3) {
2075 /* The VFS shouldn't apply the umask to mode bits. We will do
2076 * so ourselves when necessary.
2077 */
2078 sb->s_flags |= MS_POSIXACL;
2079 sb->s_time_gran = 1;
2080 }
2081
2082 sb->s_op = &nfs_sops;
2083 nfs_initialise_sb(sb);
2084 }
2085
2086 /*
2087 * Finish setting up a cloned NFS2/3 superblock
2088 */
2089 static void nfs_clone_super(struct super_block *sb,
2090 const struct super_block *old_sb)
2091 {
2092 struct nfs_server *server = NFS_SB(sb);
2093
2094 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2095 sb->s_blocksize = old_sb->s_blocksize;
2096 sb->s_maxbytes = old_sb->s_maxbytes;
2097
2098 if (server->nfs_client->rpc_ops->version == 3) {
2099 /* The VFS shouldn't apply the umask to mode bits. We will do
2100 * so ourselves when necessary.
2101 */
2102 sb->s_flags |= MS_POSIXACL;
2103 sb->s_time_gran = 1;
2104 }
2105
2106 sb->s_op = old_sb->s_op;
2107 nfs_initialise_sb(sb);
2108 }
2109
2110 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2111 {
2112 const struct nfs_server *a = s->s_fs_info;
2113 const struct rpc_clnt *clnt_a = a->client;
2114 const struct rpc_clnt *clnt_b = b->client;
2115
2116 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2117 goto Ebusy;
2118 if (a->nfs_client != b->nfs_client)
2119 goto Ebusy;
2120 if (a->flags != b->flags)
2121 goto Ebusy;
2122 if (a->wsize != b->wsize)
2123 goto Ebusy;
2124 if (a->rsize != b->rsize)
2125 goto Ebusy;
2126 if (a->acregmin != b->acregmin)
2127 goto Ebusy;
2128 if (a->acregmax != b->acregmax)
2129 goto Ebusy;
2130 if (a->acdirmin != b->acdirmin)
2131 goto Ebusy;
2132 if (a->acdirmax != b->acdirmax)
2133 goto Ebusy;
2134 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2135 goto Ebusy;
2136 return 1;
2137 Ebusy:
2138 return 0;
2139 }
2140
2141 struct nfs_sb_mountdata {
2142 struct nfs_server *server;
2143 int mntflags;
2144 };
2145
2146 static int nfs_set_super(struct super_block *s, void *data)
2147 {
2148 struct nfs_sb_mountdata *sb_mntdata = data;
2149 struct nfs_server *server = sb_mntdata->server;
2150 int ret;
2151
2152 s->s_flags = sb_mntdata->mntflags;
2153 s->s_fs_info = server;
2154 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2155 ret = set_anon_super(s, server);
2156 if (ret == 0)
2157 server->s_dev = s->s_dev;
2158 return ret;
2159 }
2160
2161 static int nfs_compare_super_address(struct nfs_server *server1,
2162 struct nfs_server *server2)
2163 {
2164 struct sockaddr *sap1, *sap2;
2165
2166 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2167 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2168
2169 if (sap1->sa_family != sap2->sa_family)
2170 return 0;
2171
2172 switch (sap1->sa_family) {
2173 case AF_INET: {
2174 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2175 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2176 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2177 return 0;
2178 if (sin1->sin_port != sin2->sin_port)
2179 return 0;
2180 break;
2181 }
2182 case AF_INET6: {
2183 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2184 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2185 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2186 return 0;
2187 if (sin1->sin6_port != sin2->sin6_port)
2188 return 0;
2189 break;
2190 }
2191 default:
2192 return 0;
2193 }
2194
2195 return 1;
2196 }
2197
2198 static int nfs_compare_super(struct super_block *sb, void *data)
2199 {
2200 struct nfs_sb_mountdata *sb_mntdata = data;
2201 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2202 int mntflags = sb_mntdata->mntflags;
2203
2204 if (!nfs_compare_super_address(old, server))
2205 return 0;
2206 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2207 if (old->flags & NFS_MOUNT_UNSHARED)
2208 return 0;
2209 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2210 return 0;
2211 return nfs_compare_mount_options(sb, server, mntflags);
2212 }
2213
2214 static int nfs_bdi_register(struct nfs_server *server)
2215 {
2216 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2217 }
2218
2219 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2220 int flags, const char *dev_name, void *raw_data)
2221 {
2222 struct nfs_server *server = NULL;
2223 struct super_block *s;
2224 struct nfs_parsed_mount_data *data;
2225 struct nfs_fh *mntfh;
2226 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2227 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2228 struct nfs_sb_mountdata sb_mntdata = {
2229 .mntflags = flags,
2230 };
2231 int error;
2232
2233 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2234 mntfh = nfs_alloc_fhandle();
2235 if (data == NULL || mntfh == NULL)
2236 goto out;
2237
2238 /* Validate the mount data */
2239 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2240 if (error < 0) {
2241 mntroot = ERR_PTR(error);
2242 goto out;
2243 }
2244
2245 #ifdef CONFIG_NFS_V4
2246 if (data->version == 4) {
2247 mntroot = nfs4_try_mount(flags, dev_name, data);
2248 goto out;
2249 }
2250 #endif /* CONFIG_NFS_V4 */
2251
2252 /* Get a volume representation */
2253 server = nfs_create_server(data, mntfh);
2254 if (IS_ERR(server)) {
2255 mntroot = ERR_CAST(server);
2256 goto out;
2257 }
2258 sb_mntdata.server = server;
2259
2260 if (server->flags & NFS_MOUNT_UNSHARED)
2261 compare_super = NULL;
2262
2263 /* -o noac implies -o sync */
2264 if (server->flags & NFS_MOUNT_NOAC)
2265 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2266
2267 /* Get a superblock - note that we may end up sharing one that already exists */
2268 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2269 if (IS_ERR(s)) {
2270 mntroot = ERR_CAST(s);
2271 goto out_err_nosb;
2272 }
2273
2274 if (s->s_fs_info != server) {
2275 nfs_free_server(server);
2276 server = NULL;
2277 } else {
2278 error = nfs_bdi_register(server);
2279 if (error) {
2280 mntroot = ERR_PTR(error);
2281 goto error_splat_bdi;
2282 }
2283 }
2284
2285 if (!s->s_root) {
2286 /* initial superblock/root creation */
2287 nfs_fill_super(s, data);
2288 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2289 }
2290
2291 mntroot = nfs_get_root(s, mntfh, dev_name);
2292 if (IS_ERR(mntroot))
2293 goto error_splat_super;
2294
2295 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2296 if (error)
2297 goto error_splat_root;
2298
2299 s->s_flags |= MS_ACTIVE;
2300
2301 out:
2302 nfs_free_parsed_mount_data(data);
2303 nfs_free_fhandle(mntfh);
2304 return mntroot;
2305
2306 out_err_nosb:
2307 nfs_free_server(server);
2308 goto out;
2309
2310 error_splat_root:
2311 dput(mntroot);
2312 mntroot = ERR_PTR(error);
2313 error_splat_super:
2314 if (server && !s->s_root)
2315 bdi_unregister(&server->backing_dev_info);
2316 error_splat_bdi:
2317 deactivate_locked_super(s);
2318 goto out;
2319 }
2320
2321 /*
2322 * Ensure that we unregister the bdi before kill_anon_super
2323 * releases the device name
2324 */
2325 static void nfs_put_super(struct super_block *s)
2326 {
2327 struct nfs_server *server = NFS_SB(s);
2328
2329 bdi_unregister(&server->backing_dev_info);
2330 }
2331
2332 /*
2333 * Destroy an NFS2/3 superblock
2334 */
2335 static void nfs_kill_super(struct super_block *s)
2336 {
2337 struct nfs_server *server = NFS_SB(s);
2338
2339 kill_anon_super(s);
2340 nfs_fscache_release_super_cookie(s);
2341 nfs_free_server(server);
2342 }
2343
2344 /*
2345 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2346 */
2347 static struct dentry *
2348 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2349 const char *dev_name, void *raw_data)
2350 {
2351 struct nfs_clone_mount *data = raw_data;
2352 struct super_block *s;
2353 struct nfs_server *server;
2354 struct dentry *mntroot;
2355 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2356 struct nfs_sb_mountdata sb_mntdata = {
2357 .mntflags = flags,
2358 };
2359 int error;
2360
2361 dprintk("--> nfs_xdev_mount()\n");
2362
2363 /* create a new volume representation */
2364 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2365 if (IS_ERR(server)) {
2366 error = PTR_ERR(server);
2367 goto out_err_noserver;
2368 }
2369 sb_mntdata.server = server;
2370
2371 if (server->flags & NFS_MOUNT_UNSHARED)
2372 compare_super = NULL;
2373
2374 /* -o noac implies -o sync */
2375 if (server->flags & NFS_MOUNT_NOAC)
2376 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2377
2378 /* Get a superblock - note that we may end up sharing one that already exists */
2379 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2380 if (IS_ERR(s)) {
2381 error = PTR_ERR(s);
2382 goto out_err_nosb;
2383 }
2384
2385 if (s->s_fs_info != server) {
2386 nfs_free_server(server);
2387 server = NULL;
2388 } else {
2389 error = nfs_bdi_register(server);
2390 if (error)
2391 goto error_splat_bdi;
2392 }
2393
2394 if (!s->s_root) {
2395 /* initial superblock/root creation */
2396 nfs_clone_super(s, data->sb);
2397 nfs_fscache_get_super_cookie(s, NULL, data);
2398 }
2399
2400 mntroot = nfs_get_root(s, data->fh, dev_name);
2401 if (IS_ERR(mntroot)) {
2402 error = PTR_ERR(mntroot);
2403 goto error_splat_super;
2404 }
2405 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2406 dput(mntroot);
2407 error = -ESTALE;
2408 goto error_splat_super;
2409 }
2410
2411 s->s_flags |= MS_ACTIVE;
2412
2413 /* clone any lsm security options from the parent to the new sb */
2414 security_sb_clone_mnt_opts(data->sb, s);
2415
2416 dprintk("<-- nfs_xdev_mount() = 0\n");
2417 return mntroot;
2418
2419 out_err_nosb:
2420 nfs_free_server(server);
2421 out_err_noserver:
2422 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2423 return ERR_PTR(error);
2424
2425 error_splat_super:
2426 if (server && !s->s_root)
2427 bdi_unregister(&server->backing_dev_info);
2428 error_splat_bdi:
2429 deactivate_locked_super(s);
2430 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2431 return ERR_PTR(error);
2432 }
2433
2434 #ifdef CONFIG_NFS_V4
2435
2436 /*
2437 * Finish setting up a cloned NFS4 superblock
2438 */
2439 static void nfs4_clone_super(struct super_block *sb,
2440 const struct super_block *old_sb)
2441 {
2442 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2443 sb->s_blocksize = old_sb->s_blocksize;
2444 sb->s_maxbytes = old_sb->s_maxbytes;
2445 sb->s_time_gran = 1;
2446 sb->s_op = old_sb->s_op;
2447 /*
2448 * The VFS shouldn't apply the umask to mode bits. We will do
2449 * so ourselves when necessary.
2450 */
2451 sb->s_flags |= MS_POSIXACL;
2452 sb->s_xattr = old_sb->s_xattr;
2453 nfs_initialise_sb(sb);
2454 }
2455
2456 /*
2457 * Set up an NFS4 superblock
2458 */
2459 static void nfs4_fill_super(struct super_block *sb)
2460 {
2461 sb->s_time_gran = 1;
2462 sb->s_op = &nfs4_sops;
2463 /*
2464 * The VFS shouldn't apply the umask to mode bits. We will do
2465 * so ourselves when necessary.
2466 */
2467 sb->s_flags |= MS_POSIXACL;
2468 sb->s_xattr = nfs4_xattr_handlers;
2469 nfs_initialise_sb(sb);
2470 }
2471
2472 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2473 {
2474 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2475 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2476 }
2477
2478 static int nfs4_validate_text_mount_data(void *options,
2479 struct nfs_parsed_mount_data *args,
2480 const char *dev_name)
2481 {
2482 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2483
2484 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2485
2486 nfs_validate_transport_protocol(args);
2487
2488 nfs4_validate_mount_flags(args);
2489
2490 if (args->version != 4) {
2491 dfprintk(MOUNT,
2492 "NFS4: Illegal mount version\n");
2493 return -EINVAL;
2494 }
2495
2496 if (args->auth_flavor_len > 1) {
2497 dfprintk(MOUNT,
2498 "NFS4: Too many RPC auth flavours specified\n");
2499 return -EINVAL;
2500 }
2501
2502 if (args->client_address == NULL) {
2503 dfprintk(MOUNT,
2504 "NFS4: mount program didn't pass callback address\n");
2505 return -EINVAL;
2506 }
2507
2508 return nfs_parse_devname(dev_name,
2509 &args->nfs_server.hostname,
2510 NFS4_MAXNAMLEN,
2511 &args->nfs_server.export_path,
2512 NFS4_MAXPATHLEN);
2513 }
2514
2515 /*
2516 * Validate NFSv4 mount options
2517 */
2518 static int nfs4_validate_mount_data(void *options,
2519 struct nfs_parsed_mount_data *args,
2520 const char *dev_name)
2521 {
2522 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2523 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2524 char *c;
2525
2526 if (data == NULL)
2527 goto out_no_data;
2528
2529 switch (data->version) {
2530 case 1:
2531 if (data->host_addrlen > sizeof(args->nfs_server.address))
2532 goto out_no_address;
2533 if (data->host_addrlen == 0)
2534 goto out_no_address;
2535 args->nfs_server.addrlen = data->host_addrlen;
2536 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2537 return -EFAULT;
2538 if (!nfs_verify_server_address(sap))
2539 goto out_no_address;
2540
2541 if (data->auth_flavourlen) {
2542 if (data->auth_flavourlen > 1)
2543 goto out_inval_auth;
2544 if (copy_from_user(&args->auth_flavors[0],
2545 data->auth_flavours,
2546 sizeof(args->auth_flavors[0])))
2547 return -EFAULT;
2548 }
2549
2550 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2551 if (IS_ERR(c))
2552 return PTR_ERR(c);
2553 args->nfs_server.hostname = c;
2554
2555 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2556 if (IS_ERR(c))
2557 return PTR_ERR(c);
2558 args->nfs_server.export_path = c;
2559 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2560
2561 c = strndup_user(data->client_addr.data, 16);
2562 if (IS_ERR(c))
2563 return PTR_ERR(c);
2564 args->client_address = c;
2565
2566 /*
2567 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2568 * can deal with.
2569 */
2570
2571 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2572 args->rsize = data->rsize;
2573 args->wsize = data->wsize;
2574 args->timeo = data->timeo;
2575 args->retrans = data->retrans;
2576 args->acregmin = data->acregmin;
2577 args->acregmax = data->acregmax;
2578 args->acdirmin = data->acdirmin;
2579 args->acdirmax = data->acdirmax;
2580 args->nfs_server.protocol = data->proto;
2581 nfs_validate_transport_protocol(args);
2582
2583 break;
2584 default:
2585 if (nfs_parse_mount_options((char *)options, args) == 0)
2586 return -EINVAL;
2587
2588 if (!nfs_verify_server_address(sap))
2589 return -EINVAL;
2590
2591 return nfs4_validate_text_mount_data(options, args, dev_name);
2592 }
2593
2594 return 0;
2595
2596 out_no_data:
2597 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2598 return -EINVAL;
2599
2600 out_inval_auth:
2601 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2602 data->auth_flavourlen);
2603 return -EINVAL;
2604
2605 out_no_address:
2606 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2607 return -EINVAL;
2608 }
2609
2610 /*
2611 * Get the superblock for the NFS4 root partition
2612 */
2613 static struct dentry *
2614 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2615 const char *dev_name, void *raw_data)
2616 {
2617 struct nfs_parsed_mount_data *data = raw_data;
2618 struct super_block *s;
2619 struct nfs_server *server;
2620 struct nfs_fh *mntfh;
2621 struct dentry *mntroot;
2622 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2623 struct nfs_sb_mountdata sb_mntdata = {
2624 .mntflags = flags,
2625 };
2626 int error = -ENOMEM;
2627
2628 mntfh = nfs_alloc_fhandle();
2629 if (data == NULL || mntfh == NULL)
2630 goto out;
2631
2632 /* Get a volume representation */
2633 server = nfs4_create_server(data, mntfh);
2634 if (IS_ERR(server)) {
2635 error = PTR_ERR(server);
2636 goto out;
2637 }
2638 sb_mntdata.server = server;
2639
2640 if (server->flags & NFS4_MOUNT_UNSHARED)
2641 compare_super = NULL;
2642
2643 /* -o noac implies -o sync */
2644 if (server->flags & NFS_MOUNT_NOAC)
2645 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2646
2647 /* Get a superblock - note that we may end up sharing one that already exists */
2648 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2649 if (IS_ERR(s)) {
2650 error = PTR_ERR(s);
2651 goto out_free;
2652 }
2653
2654 if (s->s_fs_info != server) {
2655 nfs_free_server(server);
2656 server = NULL;
2657 } else {
2658 error = nfs_bdi_register(server);
2659 if (error)
2660 goto error_splat_bdi;
2661 }
2662
2663 if (!s->s_root) {
2664 /* initial superblock/root creation */
2665 nfs4_fill_super(s);
2666 nfs_fscache_get_super_cookie(
2667 s, data ? data->fscache_uniq : NULL, NULL);
2668 }
2669
2670 mntroot = nfs4_get_root(s, mntfh, dev_name);
2671 if (IS_ERR(mntroot)) {
2672 error = PTR_ERR(mntroot);
2673 goto error_splat_super;
2674 }
2675
2676 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2677 if (error)
2678 goto error_splat_root;
2679
2680 s->s_flags |= MS_ACTIVE;
2681
2682 nfs_free_fhandle(mntfh);
2683 return mntroot;
2684
2685 out:
2686 nfs_free_fhandle(mntfh);
2687 return ERR_PTR(error);
2688
2689 out_free:
2690 nfs_free_server(server);
2691 goto out;
2692
2693 error_splat_root:
2694 dput(mntroot);
2695 error_splat_super:
2696 if (server && !s->s_root)
2697 bdi_unregister(&server->backing_dev_info);
2698 error_splat_bdi:
2699 deactivate_locked_super(s);
2700 goto out;
2701 }
2702
2703 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2704 int flags, void *data, const char *hostname)
2705 {
2706 struct vfsmount *root_mnt;
2707 char *root_devname;
2708 size_t len;
2709
2710 len = strlen(hostname) + 5;
2711 root_devname = kmalloc(len, GFP_KERNEL);
2712 if (root_devname == NULL)
2713 return ERR_PTR(-ENOMEM);
2714 /* Does hostname needs to be enclosed in brackets? */
2715 if (strchr(hostname, ':'))
2716 snprintf(root_devname, len, "[%s]:/", hostname);
2717 else
2718 snprintf(root_devname, len, "%s:/", hostname);
2719 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2720 kfree(root_devname);
2721 return root_mnt;
2722 }
2723
2724 struct nfs_referral_count {
2725 struct list_head list;
2726 const struct task_struct *task;
2727 unsigned int referral_count;
2728 };
2729
2730 static LIST_HEAD(nfs_referral_count_list);
2731 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2732
2733 static struct nfs_referral_count *nfs_find_referral_count(void)
2734 {
2735 struct nfs_referral_count *p;
2736
2737 list_for_each_entry(p, &nfs_referral_count_list, list) {
2738 if (p->task == current)
2739 return p;
2740 }
2741 return NULL;
2742 }
2743
2744 #define NFS_MAX_NESTED_REFERRALS 2
2745
2746 static int nfs_referral_loop_protect(void)
2747 {
2748 struct nfs_referral_count *p, *new;
2749 int ret = -ENOMEM;
2750
2751 new = kmalloc(sizeof(*new), GFP_KERNEL);
2752 if (!new)
2753 goto out;
2754 new->task = current;
2755 new->referral_count = 1;
2756
2757 ret = 0;
2758 spin_lock(&nfs_referral_count_list_lock);
2759 p = nfs_find_referral_count();
2760 if (p != NULL) {
2761 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2762 ret = -ELOOP;
2763 else
2764 p->referral_count++;
2765 } else {
2766 list_add(&new->list, &nfs_referral_count_list);
2767 new = NULL;
2768 }
2769 spin_unlock(&nfs_referral_count_list_lock);
2770 kfree(new);
2771 out:
2772 return ret;
2773 }
2774
2775 static void nfs_referral_loop_unprotect(void)
2776 {
2777 struct nfs_referral_count *p;
2778
2779 spin_lock(&nfs_referral_count_list_lock);
2780 p = nfs_find_referral_count();
2781 p->referral_count--;
2782 if (p->referral_count == 0)
2783 list_del(&p->list);
2784 else
2785 p = NULL;
2786 spin_unlock(&nfs_referral_count_list_lock);
2787 kfree(p);
2788 }
2789
2790 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2791 const char *export_path)
2792 {
2793 struct dentry *dentry;
2794 int err;
2795
2796 if (IS_ERR(root_mnt))
2797 return ERR_CAST(root_mnt);
2798
2799 err = nfs_referral_loop_protect();
2800 if (err) {
2801 mntput(root_mnt);
2802 return ERR_PTR(err);
2803 }
2804
2805 dentry = mount_subtree(root_mnt, export_path);
2806 nfs_referral_loop_unprotect();
2807
2808 return dentry;
2809 }
2810
2811 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2812 struct nfs_parsed_mount_data *data)
2813 {
2814 char *export_path;
2815 struct vfsmount *root_mnt;
2816 struct dentry *res;
2817
2818 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2819
2820 export_path = data->nfs_server.export_path;
2821 data->nfs_server.export_path = "/";
2822 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2823 data->nfs_server.hostname);
2824 data->nfs_server.export_path = export_path;
2825
2826 res = nfs_follow_remote_path(root_mnt, export_path);
2827
2828 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2829 IS_ERR(res) ? PTR_ERR(res) : 0,
2830 IS_ERR(res) ? " [error]" : "");
2831 return res;
2832 }
2833
2834 /*
2835 * Get the superblock for an NFS4 mountpoint
2836 */
2837 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2838 int flags, const char *dev_name, void *raw_data)
2839 {
2840 struct nfs_parsed_mount_data *data;
2841 int error = -ENOMEM;
2842 struct dentry *res = ERR_PTR(-ENOMEM);
2843
2844 data = nfs_alloc_parsed_mount_data(4);
2845 if (data == NULL)
2846 goto out;
2847
2848 /* Validate the mount data */
2849 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2850 if (error < 0) {
2851 res = ERR_PTR(error);
2852 goto out;
2853 }
2854
2855 res = nfs4_try_mount(flags, dev_name, data);
2856 if (IS_ERR(res))
2857 error = PTR_ERR(res);
2858
2859 out:
2860 nfs_free_parsed_mount_data(data);
2861 dprintk("<-- nfs4_mount() = %d%s\n", error,
2862 error != 0 ? " [error]" : "");
2863 return res;
2864 }
2865
2866 static void nfs4_kill_super(struct super_block *sb)
2867 {
2868 struct nfs_server *server = NFS_SB(sb);
2869
2870 dprintk("--> %s\n", __func__);
2871 nfs_super_return_all_delegations(sb);
2872 kill_anon_super(sb);
2873 nfs_fscache_release_super_cookie(sb);
2874 nfs_free_server(server);
2875 dprintk("<-- %s\n", __func__);
2876 }
2877
2878 /*
2879 * Clone an NFS4 server record on xdev traversal (FSID-change)
2880 */
2881 static struct dentry *
2882 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2883 const char *dev_name, void *raw_data)
2884 {
2885 struct nfs_clone_mount *data = raw_data;
2886 struct super_block *s;
2887 struct nfs_server *server;
2888 struct dentry *mntroot;
2889 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2890 struct nfs_sb_mountdata sb_mntdata = {
2891 .mntflags = flags,
2892 };
2893 int error;
2894
2895 dprintk("--> nfs4_xdev_mount()\n");
2896
2897 /* create a new volume representation */
2898 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2899 if (IS_ERR(server)) {
2900 error = PTR_ERR(server);
2901 goto out_err_noserver;
2902 }
2903 sb_mntdata.server = server;
2904
2905 if (server->flags & NFS4_MOUNT_UNSHARED)
2906 compare_super = NULL;
2907
2908 /* -o noac implies -o sync */
2909 if (server->flags & NFS_MOUNT_NOAC)
2910 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2911
2912 /* Get a superblock - note that we may end up sharing one that already exists */
2913 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2914 if (IS_ERR(s)) {
2915 error = PTR_ERR(s);
2916 goto out_err_nosb;
2917 }
2918
2919 if (s->s_fs_info != server) {
2920 nfs_free_server(server);
2921 server = NULL;
2922 } else {
2923 error = nfs_bdi_register(server);
2924 if (error)
2925 goto error_splat_bdi;
2926 }
2927
2928 if (!s->s_root) {
2929 /* initial superblock/root creation */
2930 nfs4_clone_super(s, data->sb);
2931 nfs_fscache_get_super_cookie(s, NULL, data);
2932 }
2933
2934 mntroot = nfs4_get_root(s, data->fh, dev_name);
2935 if (IS_ERR(mntroot)) {
2936 error = PTR_ERR(mntroot);
2937 goto error_splat_super;
2938 }
2939 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2940 dput(mntroot);
2941 error = -ESTALE;
2942 goto error_splat_super;
2943 }
2944
2945 s->s_flags |= MS_ACTIVE;
2946
2947 security_sb_clone_mnt_opts(data->sb, s);
2948
2949 dprintk("<-- nfs4_xdev_mount() = 0\n");
2950 return mntroot;
2951
2952 out_err_nosb:
2953 nfs_free_server(server);
2954 out_err_noserver:
2955 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2956 return ERR_PTR(error);
2957
2958 error_splat_super:
2959 if (server && !s->s_root)
2960 bdi_unregister(&server->backing_dev_info);
2961 error_splat_bdi:
2962 deactivate_locked_super(s);
2963 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2964 return ERR_PTR(error);
2965 }
2966
2967 static struct dentry *
2968 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2969 const char *dev_name, void *raw_data)
2970 {
2971 struct nfs_clone_mount *data = raw_data;
2972 struct super_block *s;
2973 struct nfs_server *server;
2974 struct dentry *mntroot;
2975 struct nfs_fh *mntfh;
2976 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2977 struct nfs_sb_mountdata sb_mntdata = {
2978 .mntflags = flags,
2979 };
2980 int error = -ENOMEM;
2981
2982 dprintk("--> nfs4_referral_get_sb()\n");
2983
2984 mntfh = nfs_alloc_fhandle();
2985 if (mntfh == NULL)
2986 goto out_err_nofh;
2987
2988 /* create a new volume representation */
2989 server = nfs4_create_referral_server(data, mntfh);
2990 if (IS_ERR(server)) {
2991 error = PTR_ERR(server);
2992 goto out_err_noserver;
2993 }
2994 sb_mntdata.server = server;
2995
2996 if (server->flags & NFS4_MOUNT_UNSHARED)
2997 compare_super = NULL;
2998
2999 /* -o noac implies -o sync */
3000 if (server->flags & NFS_MOUNT_NOAC)
3001 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3002
3003 /* Get a superblock - note that we may end up sharing one that already exists */
3004 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3005 if (IS_ERR(s)) {
3006 error = PTR_ERR(s);
3007 goto out_err_nosb;
3008 }
3009
3010 if (s->s_fs_info != server) {
3011 nfs_free_server(server);
3012 server = NULL;
3013 } else {
3014 error = nfs_bdi_register(server);
3015 if (error)
3016 goto error_splat_bdi;
3017 }
3018
3019 if (!s->s_root) {
3020 /* initial superblock/root creation */
3021 nfs4_fill_super(s);
3022 nfs_fscache_get_super_cookie(s, NULL, data);
3023 }
3024
3025 mntroot = nfs4_get_root(s, mntfh, dev_name);
3026 if (IS_ERR(mntroot)) {
3027 error = PTR_ERR(mntroot);
3028 goto error_splat_super;
3029 }
3030 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3031 dput(mntroot);
3032 error = -ESTALE;
3033 goto error_splat_super;
3034 }
3035
3036 s->s_flags |= MS_ACTIVE;
3037
3038 security_sb_clone_mnt_opts(data->sb, s);
3039
3040 nfs_free_fhandle(mntfh);
3041 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3042 return mntroot;
3043
3044 out_err_nosb:
3045 nfs_free_server(server);
3046 out_err_noserver:
3047 nfs_free_fhandle(mntfh);
3048 out_err_nofh:
3049 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3050 return ERR_PTR(error);
3051
3052 error_splat_super:
3053 if (server && !s->s_root)
3054 bdi_unregister(&server->backing_dev_info);
3055 error_splat_bdi:
3056 deactivate_locked_super(s);
3057 nfs_free_fhandle(mntfh);
3058 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3059 return ERR_PTR(error);
3060 }
3061
3062 /*
3063 * Create an NFS4 server record on referral traversal
3064 */
3065 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3066 int flags, const char *dev_name, void *raw_data)
3067 {
3068 struct nfs_clone_mount *data = raw_data;
3069 char *export_path;
3070 struct vfsmount *root_mnt;
3071 struct dentry *res;
3072
3073 dprintk("--> nfs4_referral_mount()\n");
3074
3075 export_path = data->mnt_path;
3076 data->mnt_path = "/";
3077
3078 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3079 flags, data, data->hostname);
3080 data->mnt_path = export_path;
3081
3082 res = nfs_follow_remote_path(root_mnt, export_path);
3083 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3084 IS_ERR(res) ? PTR_ERR(res) : 0,
3085 IS_ERR(res) ? " [error]" : "");
3086 return res;
3087 }
3088
3089 #endif /* CONFIG_NFS_V4 */