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NFSv4: Disallow 'mount -t nfs4 -overs=2' and 'mount -t nfs4 -overs=3'
[linux-2.6/mini2440.git] / fs / nfs / super.c
blob867f705045313217c2bcbf40d3a78ad82cbeccb9
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/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/mnt_namespace.h>
46 #include <linux/namei.h>
47 #include <linux/nfs_idmap.h>
48 #include <linux/vfs.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3, Opt_v4,
77 Opt_udp, Opt_tcp, Opt_rdma,
78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
80 Opt_sharecache, Opt_nosharecache,
81 Opt_resvport, Opt_noresvport,
82 Opt_fscache, Opt_nofscache,
83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
93 Opt_mountvers,
94 Opt_nfsvers,
95 Opt_minorversion,
96
97 /* Mount options that take string arguments */
98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
100 Opt_lookupcache,
101 Opt_fscache_uniq,
102
103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
105
106 Opt_err
107 };
108
109 static const match_table_t nfs_mount_option_tokens = {
110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
112 { Opt_userspace, "retry=%s" },
113
114 { Opt_sloppy, "sloppy" },
115
116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_v4, "v4" },
131 { Opt_udp, "udp" },
132 { Opt_tcp, "tcp" },
133 { Opt_rdma, "rdma" },
134 { Opt_acl, "acl" },
135 { Opt_noacl, "noacl" },
136 { Opt_rdirplus, "rdirplus" },
137 { Opt_nordirplus, "nordirplus" },
138 { Opt_sharecache, "sharecache" },
139 { Opt_nosharecache, "nosharecache" },
140 { Opt_resvport, "resvport" },
141 { Opt_noresvport, "noresvport" },
142 { Opt_fscache, "fsc" },
143 { Opt_fscache_uniq, "fsc=%s" },
144 { Opt_nofscache, "nofsc" },
145
146 { Opt_port, "port=%s" },
147 { Opt_rsize, "rsize=%s" },
148 { Opt_wsize, "wsize=%s" },
149 { Opt_bsize, "bsize=%s" },
150 { Opt_timeo, "timeo=%s" },
151 { Opt_retrans, "retrans=%s" },
152 { Opt_acregmin, "acregmin=%s" },
153 { Opt_acregmax, "acregmax=%s" },
154 { Opt_acdirmin, "acdirmin=%s" },
155 { Opt_acdirmax, "acdirmax=%s" },
156 { Opt_actimeo, "actimeo=%s" },
157 { Opt_namelen, "namlen=%s" },
158 { Opt_mountport, "mountport=%s" },
159 { Opt_mountvers, "mountvers=%s" },
160 { Opt_nfsvers, "nfsvers=%s" },
161 { Opt_nfsvers, "vers=%s" },
162 { Opt_minorversion, "minorversion=%s" },
163
164 { Opt_sec, "sec=%s" },
165 { Opt_proto, "proto=%s" },
166 { Opt_mountproto, "mountproto=%s" },
167 { Opt_addr, "addr=%s" },
168 { Opt_clientaddr, "clientaddr=%s" },
169 { Opt_mounthost, "mounthost=%s" },
170 { Opt_mountaddr, "mountaddr=%s" },
171
172 { Opt_lookupcache, "lookupcache=%s" },
173
174 { Opt_err, NULL }
175 };
176
177 enum {
178 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
179
180 Opt_xprt_err
181 };
182
183 static const match_table_t nfs_xprt_protocol_tokens = {
184 { Opt_xprt_udp, "udp" },
185 { Opt_xprt_tcp, "tcp" },
186 { Opt_xprt_rdma, "rdma" },
187
188 { Opt_xprt_err, NULL }
189 };
190
191 enum {
192 Opt_sec_none, Opt_sec_sys,
193 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
194 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
195 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
196
197 Opt_sec_err
198 };
199
200 static const match_table_t nfs_secflavor_tokens = {
201 { Opt_sec_none, "none" },
202 { Opt_sec_none, "null" },
203 { Opt_sec_sys, "sys" },
204
205 { Opt_sec_krb5, "krb5" },
206 { Opt_sec_krb5i, "krb5i" },
207 { Opt_sec_krb5p, "krb5p" },
208
209 { Opt_sec_lkey, "lkey" },
210 { Opt_sec_lkeyi, "lkeyi" },
211 { Opt_sec_lkeyp, "lkeyp" },
212
213 { Opt_sec_spkm, "spkm3" },
214 { Opt_sec_spkmi, "spkm3i" },
215 { Opt_sec_spkmp, "spkm3p" },
216
217 { Opt_sec_err, NULL }
218 };
219
220 enum {
221 Opt_lookupcache_all, Opt_lookupcache_positive,
222 Opt_lookupcache_none,
223
224 Opt_lookupcache_err
225 };
226
227 static match_table_t nfs_lookupcache_tokens = {
228 { Opt_lookupcache_all, "all" },
229 { Opt_lookupcache_positive, "pos" },
230 { Opt_lookupcache_positive, "positive" },
231 { Opt_lookupcache_none, "none" },
232
233 { Opt_lookupcache_err, NULL }
234 };
235
236
237 static void nfs_umount_begin(struct super_block *);
238 static int nfs_statfs(struct dentry *, struct kstatfs *);
239 static int nfs_show_options(struct seq_file *, struct vfsmount *);
240 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
241 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
242 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static void nfs_kill_super(struct super_block *);
245 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
246
247 static struct file_system_type nfs_fs_type = {
248 .owner = THIS_MODULE,
249 .name = "nfs",
250 .get_sb = nfs_get_sb,
251 .kill_sb = nfs_kill_super,
252 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
253 };
254
255 struct file_system_type nfs_xdev_fs_type = {
256 .owner = THIS_MODULE,
257 .name = "nfs",
258 .get_sb = nfs_xdev_get_sb,
259 .kill_sb = nfs_kill_super,
260 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
261 };
262
263 static const struct super_operations nfs_sops = {
264 .alloc_inode = nfs_alloc_inode,
265 .destroy_inode = nfs_destroy_inode,
266 .write_inode = nfs_write_inode,
267 .statfs = nfs_statfs,
268 .clear_inode = nfs_clear_inode,
269 .umount_begin = nfs_umount_begin,
270 .show_options = nfs_show_options,
271 .show_stats = nfs_show_stats,
272 .remount_fs = nfs_remount,
273 };
274
275 #ifdef CONFIG_NFS_V4
276 static int nfs4_validate_text_mount_data(void *options,
277 struct nfs_parsed_mount_data *args, const char *dev_name);
278 static int nfs4_try_mount(int flags, const char *dev_name,
279 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
280 static int nfs4_get_sb(struct file_system_type *fs_type,
281 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
282 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
283 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
284 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
285 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
286 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
287 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
288 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
290 static void nfs4_kill_super(struct super_block *sb);
291
292 static struct file_system_type nfs4_fs_type = {
293 .owner = THIS_MODULE,
294 .name = "nfs4",
295 .get_sb = nfs4_get_sb,
296 .kill_sb = nfs4_kill_super,
297 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
298 };
299
300 static struct file_system_type nfs4_remote_fs_type = {
301 .owner = THIS_MODULE,
302 .name = "nfs4",
303 .get_sb = nfs4_remote_get_sb,
304 .kill_sb = nfs4_kill_super,
305 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
306 };
307
308 struct file_system_type nfs4_xdev_fs_type = {
309 .owner = THIS_MODULE,
310 .name = "nfs4",
311 .get_sb = nfs4_xdev_get_sb,
312 .kill_sb = nfs4_kill_super,
313 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
314 };
315
316 static struct file_system_type nfs4_remote_referral_fs_type = {
317 .owner = THIS_MODULE,
318 .name = "nfs4",
319 .get_sb = nfs4_remote_referral_get_sb,
320 .kill_sb = nfs4_kill_super,
321 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
322 };
323
324 struct file_system_type nfs4_referral_fs_type = {
325 .owner = THIS_MODULE,
326 .name = "nfs4",
327 .get_sb = nfs4_referral_get_sb,
328 .kill_sb = nfs4_kill_super,
329 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
330 };
331
332 static const struct super_operations nfs4_sops = {
333 .alloc_inode = nfs_alloc_inode,
334 .destroy_inode = nfs_destroy_inode,
335 .write_inode = nfs_write_inode,
336 .statfs = nfs_statfs,
337 .clear_inode = nfs4_clear_inode,
338 .umount_begin = nfs_umount_begin,
339 .show_options = nfs_show_options,
340 .show_stats = nfs_show_stats,
341 .remount_fs = nfs_remount,
342 };
343 #endif
344
345 static struct shrinker acl_shrinker = {
346 .shrink = nfs_access_cache_shrinker,
347 .seeks = DEFAULT_SEEKS,
348 };
349
350 /*
351 * Register the NFS filesystems
352 */
353 int __init register_nfs_fs(void)
354 {
355 int ret;
356
357 ret = register_filesystem(&nfs_fs_type);
358 if (ret < 0)
359 goto error_0;
360
361 ret = nfs_register_sysctl();
362 if (ret < 0)
363 goto error_1;
364 #ifdef CONFIG_NFS_V4
365 ret = register_filesystem(&nfs4_fs_type);
366 if (ret < 0)
367 goto error_2;
368 #endif
369 register_shrinker(&acl_shrinker);
370 return 0;
371
372 #ifdef CONFIG_NFS_V4
373 error_2:
374 nfs_unregister_sysctl();
375 #endif
376 error_1:
377 unregister_filesystem(&nfs_fs_type);
378 error_0:
379 return ret;
380 }
381
382 /*
383 * Unregister the NFS filesystems
384 */
385 void __exit unregister_nfs_fs(void)
386 {
387 unregister_shrinker(&acl_shrinker);
388 #ifdef CONFIG_NFS_V4
389 unregister_filesystem(&nfs4_fs_type);
390 #endif
391 nfs_unregister_sysctl();
392 unregister_filesystem(&nfs_fs_type);
393 }
394
395 void nfs_sb_active(struct super_block *sb)
396 {
397 struct nfs_server *server = NFS_SB(sb);
398
399 if (atomic_inc_return(&server->active) == 1)
400 atomic_inc(&sb->s_active);
401 }
402
403 void nfs_sb_deactive(struct super_block *sb)
404 {
405 struct nfs_server *server = NFS_SB(sb);
406
407 if (atomic_dec_and_test(&server->active))
408 deactivate_super(sb);
409 }
410
411 /*
412 * Deliver file system statistics to userspace
413 */
414 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
415 {
416 struct nfs_server *server = NFS_SB(dentry->d_sb);
417 unsigned char blockbits;
418 unsigned long blockres;
419 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
420 struct nfs_fattr fattr;
421 struct nfs_fsstat res = {
422 .fattr = &fattr,
423 };
424 int error;
425
426 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
427 if (error < 0)
428 goto out_err;
429 buf->f_type = NFS_SUPER_MAGIC;
430
431 /*
432 * Current versions of glibc do not correctly handle the
433 * case where f_frsize != f_bsize. Eventually we want to
434 * report the value of wtmult in this field.
435 */
436 buf->f_frsize = dentry->d_sb->s_blocksize;
437
438 /*
439 * On most *nix systems, f_blocks, f_bfree, and f_bavail
440 * are reported in units of f_frsize. Linux hasn't had
441 * an f_frsize field in its statfs struct until recently,
442 * thus historically Linux's sys_statfs reports these
443 * fields in units of f_bsize.
444 */
445 buf->f_bsize = dentry->d_sb->s_blocksize;
446 blockbits = dentry->d_sb->s_blocksize_bits;
447 blockres = (1 << blockbits) - 1;
448 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
449 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
450 buf->f_bavail = (res.abytes + blockres) >> blockbits;
451
452 buf->f_files = res.tfiles;
453 buf->f_ffree = res.afiles;
454
455 buf->f_namelen = server->namelen;
456
457 return 0;
458
459 out_err:
460 dprintk("%s: statfs error = %d\n", __func__, -error);
461 return error;
462 }
463
464 /*
465 * Map the security flavour number to a name
466 */
467 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
468 {
469 static const struct {
470 rpc_authflavor_t flavour;
471 const char *str;
472 } sec_flavours[] = {
473 { RPC_AUTH_NULL, "null" },
474 { RPC_AUTH_UNIX, "sys" },
475 { RPC_AUTH_GSS_KRB5, "krb5" },
476 { RPC_AUTH_GSS_KRB5I, "krb5i" },
477 { RPC_AUTH_GSS_KRB5P, "krb5p" },
478 { RPC_AUTH_GSS_LKEY, "lkey" },
479 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
480 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
481 { RPC_AUTH_GSS_SPKM, "spkm" },
482 { RPC_AUTH_GSS_SPKMI, "spkmi" },
483 { RPC_AUTH_GSS_SPKMP, "spkmp" },
484 { UINT_MAX, "unknown" }
485 };
486 int i;
487
488 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
489 if (sec_flavours[i].flavour == flavour)
490 break;
491 }
492 return sec_flavours[i].str;
493 }
494
495 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
496 int showdefaults)
497 {
498 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
499
500 switch (sap->sa_family) {
501 case AF_INET: {
502 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
503 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
504 break;
505 }
506 case AF_INET6: {
507 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
508 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
509 break;
510 }
511 default:
512 if (showdefaults)
513 seq_printf(m, ",mountaddr=unspecified");
514 }
515
516 if (nfss->mountd_version || showdefaults)
517 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
518 if (nfss->mountd_port || showdefaults)
519 seq_printf(m, ",mountport=%u", nfss->mountd_port);
520
521 switch (nfss->mountd_protocol) {
522 case IPPROTO_UDP:
523 seq_printf(m, ",mountproto=udp");
524 break;
525 case IPPROTO_TCP:
526 seq_printf(m, ",mountproto=tcp");
527 break;
528 default:
529 if (showdefaults)
530 seq_printf(m, ",mountproto=auto");
531 }
532 }
533
534 /*
535 * Describe the mount options in force on this server representation
536 */
537 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
538 int showdefaults)
539 {
540 static const struct proc_nfs_info {
541 int flag;
542 const char *str;
543 const char *nostr;
544 } nfs_info[] = {
545 { NFS_MOUNT_SOFT, ",soft", ",hard" },
546 { NFS_MOUNT_POSIX, ",posix", "" },
547 { NFS_MOUNT_NOCTO, ",nocto", "" },
548 { NFS_MOUNT_NOAC, ",noac", "" },
549 { NFS_MOUNT_NONLM, ",nolock", "" },
550 { NFS_MOUNT_NOACL, ",noacl", "" },
551 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
552 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
553 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
554 { 0, NULL, NULL }
555 };
556 const struct proc_nfs_info *nfs_infop;
557 struct nfs_client *clp = nfss->nfs_client;
558 u32 version = clp->rpc_ops->version;
559
560 seq_printf(m, ",vers=%u", version);
561 seq_printf(m, ",rsize=%u", nfss->rsize);
562 seq_printf(m, ",wsize=%u", nfss->wsize);
563 if (nfss->bsize != 0)
564 seq_printf(m, ",bsize=%u", nfss->bsize);
565 seq_printf(m, ",namlen=%u", nfss->namelen);
566 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
567 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
568 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
569 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
570 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
571 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
572 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
573 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
574 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
575 if (nfss->flags & nfs_infop->flag)
576 seq_puts(m, nfs_infop->str);
577 else
578 seq_puts(m, nfs_infop->nostr);
579 }
580 seq_printf(m, ",proto=%s",
581 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
582 if (version == 4) {
583 if (nfss->port != NFS_PORT)
584 seq_printf(m, ",port=%u", nfss->port);
585 } else
586 if (nfss->port)
587 seq_printf(m, ",port=%u", nfss->port);
588
589 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
590 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
591 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
592
593 if (version != 4)
594 nfs_show_mountd_options(m, nfss, showdefaults);
595
596 #ifdef CONFIG_NFS_V4
597 if (clp->rpc_ops->version == 4)
598 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
599 #endif
600 if (nfss->options & NFS_OPTION_FSCACHE)
601 seq_printf(m, ",fsc");
602 }
603
604 /*
605 * Describe the mount options on this VFS mountpoint
606 */
607 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
608 {
609 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
610
611 nfs_show_mount_options(m, nfss, 0);
612
613 seq_printf(m, ",addr=%s",
614 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
615 RPC_DISPLAY_ADDR));
616
617 return 0;
618 }
619
620 /*
621 * Present statistical information for this VFS mountpoint
622 */
623 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
624 {
625 int i, cpu;
626 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
627 struct rpc_auth *auth = nfss->client->cl_auth;
628 struct nfs_iostats totals = { };
629
630 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
631
632 /*
633 * Display all mount option settings
634 */
635 seq_printf(m, "\n\topts:\t");
636 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
637 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
638 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
639 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
640 nfs_show_mount_options(m, nfss, 1);
641
642 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
643
644 seq_printf(m, "\n\tcaps:\t");
645 seq_printf(m, "caps=0x%x", nfss->caps);
646 seq_printf(m, ",wtmult=%u", nfss->wtmult);
647 seq_printf(m, ",dtsize=%u", nfss->dtsize);
648 seq_printf(m, ",bsize=%u", nfss->bsize);
649 seq_printf(m, ",namlen=%u", nfss->namelen);
650
651 #ifdef CONFIG_NFS_V4
652 if (nfss->nfs_client->rpc_ops->version == 4) {
653 seq_printf(m, "\n\tnfsv4:\t");
654 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
655 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
656 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
657 }
658 #endif
659
660 /*
661 * Display security flavor in effect for this mount
662 */
663 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
664 if (auth->au_flavor)
665 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
666
667 /*
668 * Display superblock I/O counters
669 */
670 for_each_possible_cpu(cpu) {
671 struct nfs_iostats *stats;
672
673 preempt_disable();
674 stats = per_cpu_ptr(nfss->io_stats, cpu);
675
676 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
677 totals.events[i] += stats->events[i];
678 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
679 totals.bytes[i] += stats->bytes[i];
680 #ifdef CONFIG_NFS_FSCACHE
681 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
682 totals.fscache[i] += stats->fscache[i];
683 #endif
684
685 preempt_enable();
686 }
687
688 seq_printf(m, "\n\tevents:\t");
689 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
690 seq_printf(m, "%lu ", totals.events[i]);
691 seq_printf(m, "\n\tbytes:\t");
692 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
694 #ifdef CONFIG_NFS_FSCACHE
695 if (nfss->options & NFS_OPTION_FSCACHE) {
696 seq_printf(m, "\n\tfsc:\t");
697 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
698 seq_printf(m, "%Lu ", totals.bytes[i]);
699 }
700 #endif
701 seq_printf(m, "\n");
702
703 rpc_print_iostats(m, nfss->client);
704
705 return 0;
706 }
707
708 /*
709 * Begin unmount by attempting to remove all automounted mountpoints we added
710 * in response to xdev traversals and referrals
711 */
712 static void nfs_umount_begin(struct super_block *sb)
713 {
714 struct nfs_server *server;
715 struct rpc_clnt *rpc;
716
717 lock_kernel();
718
719 server = NFS_SB(sb);
720 /* -EIO all pending I/O */
721 rpc = server->client_acl;
722 if (!IS_ERR(rpc))
723 rpc_killall_tasks(rpc);
724 rpc = server->client;
725 if (!IS_ERR(rpc))
726 rpc_killall_tasks(rpc);
727
728 unlock_kernel();
729 }
730
731 /*
732 * Sanity-check a server address provided by the mount command.
733 *
734 * Address family must be initialized, and address must not be
735 * the ANY address for that family.
736 */
737 static int nfs_verify_server_address(struct sockaddr *addr)
738 {
739 switch (addr->sa_family) {
740 case AF_INET: {
741 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
742 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
743 }
744 case AF_INET6: {
745 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
746 return !ipv6_addr_any(sa);
747 }
748 }
749
750 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
751 return 0;
752 }
753
754 /*
755 * Select between a default port value and a user-specified port value.
756 * If a zero value is set, then autobind will be used.
757 */
758 static void nfs_set_default_port(struct sockaddr *sap, const int parsed_port,
759 const unsigned short default_port)
760 {
761 unsigned short port = default_port;
762
763 if (parsed_port != NFS_UNSPEC_PORT)
764 port = parsed_port;
765
766 rpc_set_port(sap, port);
767 }
768
769 /*
770 * Sanity check the NFS transport protocol.
771 *
772 */
773 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
774 {
775 switch (mnt->nfs_server.protocol) {
776 case XPRT_TRANSPORT_UDP:
777 case XPRT_TRANSPORT_TCP:
778 case XPRT_TRANSPORT_RDMA:
779 break;
780 default:
781 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
782 }
783 }
784
785 /*
786 * For text based NFSv2/v3 mounts, the mount protocol transport default
787 * settings should depend upon the specified NFS transport.
788 */
789 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
790 {
791 nfs_validate_transport_protocol(mnt);
792
793 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
794 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
795 return;
796 switch (mnt->nfs_server.protocol) {
797 case XPRT_TRANSPORT_UDP:
798 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
799 break;
800 case XPRT_TRANSPORT_TCP:
801 case XPRT_TRANSPORT_RDMA:
802 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
803 }
804 }
805
806 /*
807 * Parse the value of the 'sec=' option.
808 */
809 static int nfs_parse_security_flavors(char *value,
810 struct nfs_parsed_mount_data *mnt)
811 {
812 substring_t args[MAX_OPT_ARGS];
813
814 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
815
816 switch (match_token(value, nfs_secflavor_tokens, args)) {
817 case Opt_sec_none:
818 mnt->auth_flavors[0] = RPC_AUTH_NULL;
819 break;
820 case Opt_sec_sys:
821 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
822 break;
823 case Opt_sec_krb5:
824 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
825 break;
826 case Opt_sec_krb5i:
827 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
828 break;
829 case Opt_sec_krb5p:
830 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
831 break;
832 case Opt_sec_lkey:
833 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
834 break;
835 case Opt_sec_lkeyi:
836 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
837 break;
838 case Opt_sec_lkeyp:
839 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
840 break;
841 case Opt_sec_spkm:
842 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
843 break;
844 case Opt_sec_spkmi:
845 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
846 break;
847 case Opt_sec_spkmp:
848 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
849 break;
850 default:
851 return 0;
852 }
853
854 mnt->auth_flavor_len = 1;
855 return 1;
856 }
857
858 /*
859 * Error-check and convert a string of mount options from user space into
860 * a data structure. The whole mount string is processed; bad options are
861 * skipped as they are encountered. If there were no errors, return 1;
862 * otherwise return 0 (zero).
863 */
864 static int nfs_parse_mount_options(char *raw,
865 struct nfs_parsed_mount_data *mnt)
866 {
867 char *p, *string, *secdata;
868 int rc, sloppy = 0, invalid_option = 0;
869
870 if (!raw) {
871 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
872 return 1;
873 }
874 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
875
876 secdata = alloc_secdata();
877 if (!secdata)
878 goto out_nomem;
879
880 rc = security_sb_copy_data(raw, secdata);
881 if (rc)
882 goto out_security_failure;
883
884 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
885 if (rc)
886 goto out_security_failure;
887
888 free_secdata(secdata);
889
890 while ((p = strsep(&raw, ",")) != NULL) {
891 substring_t args[MAX_OPT_ARGS];
892 unsigned long option;
893 int token;
894
895 if (!*p)
896 continue;
897
898 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
899
900 token = match_token(p, nfs_mount_option_tokens, args);
901 switch (token) {
902
903 /*
904 * boolean options: foo/nofoo
905 */
906 case Opt_soft:
907 mnt->flags |= NFS_MOUNT_SOFT;
908 break;
909 case Opt_hard:
910 mnt->flags &= ~NFS_MOUNT_SOFT;
911 break;
912 case Opt_posix:
913 mnt->flags |= NFS_MOUNT_POSIX;
914 break;
915 case Opt_noposix:
916 mnt->flags &= ~NFS_MOUNT_POSIX;
917 break;
918 case Opt_cto:
919 mnt->flags &= ~NFS_MOUNT_NOCTO;
920 break;
921 case Opt_nocto:
922 mnt->flags |= NFS_MOUNT_NOCTO;
923 break;
924 case Opt_ac:
925 mnt->flags &= ~NFS_MOUNT_NOAC;
926 break;
927 case Opt_noac:
928 mnt->flags |= NFS_MOUNT_NOAC;
929 break;
930 case Opt_lock:
931 mnt->flags &= ~NFS_MOUNT_NONLM;
932 break;
933 case Opt_nolock:
934 mnt->flags |= NFS_MOUNT_NONLM;
935 break;
936 case Opt_v2:
937 mnt->flags &= ~NFS_MOUNT_VER3;
938 mnt->version = 2;
939 break;
940 case Opt_v3:
941 mnt->flags |= NFS_MOUNT_VER3;
942 mnt->version = 3;
943 break;
944 #ifdef CONFIG_NFS_V4
945 case Opt_v4:
946 mnt->flags &= ~NFS_MOUNT_VER3;
947 mnt->version = 4;
948 break;
949 #endif
950 case Opt_udp:
951 mnt->flags &= ~NFS_MOUNT_TCP;
952 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
953 break;
954 case Opt_tcp:
955 mnt->flags |= NFS_MOUNT_TCP;
956 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
957 break;
958 case Opt_rdma:
959 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
960 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
961 xprt_load_transport(p);
962 break;
963 case Opt_acl:
964 mnt->flags &= ~NFS_MOUNT_NOACL;
965 break;
966 case Opt_noacl:
967 mnt->flags |= NFS_MOUNT_NOACL;
968 break;
969 case Opt_rdirplus:
970 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
971 break;
972 case Opt_nordirplus:
973 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
974 break;
975 case Opt_sharecache:
976 mnt->flags &= ~NFS_MOUNT_UNSHARED;
977 break;
978 case Opt_nosharecache:
979 mnt->flags |= NFS_MOUNT_UNSHARED;
980 break;
981 case Opt_resvport:
982 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
983 break;
984 case Opt_noresvport:
985 mnt->flags |= NFS_MOUNT_NORESVPORT;
986 break;
987 case Opt_fscache:
988 mnt->options |= NFS_OPTION_FSCACHE;
989 kfree(mnt->fscache_uniq);
990 mnt->fscache_uniq = NULL;
991 break;
992 case Opt_nofscache:
993 mnt->options &= ~NFS_OPTION_FSCACHE;
994 kfree(mnt->fscache_uniq);
995 mnt->fscache_uniq = NULL;
996 break;
997 case Opt_fscache_uniq:
998 string = match_strdup(args);
999 if (!string)
1000 goto out_nomem;
1001 kfree(mnt->fscache_uniq);
1002 mnt->fscache_uniq = string;
1003 mnt->options |= NFS_OPTION_FSCACHE;
1004 break;
1005
1006 /*
1007 * options that take numeric values
1008 */
1009 case Opt_port:
1010 string = match_strdup(args);
1011 if (string == NULL)
1012 goto out_nomem;
1013 rc = strict_strtoul(string, 10, &option);
1014 kfree(string);
1015 if (rc != 0 || option > USHORT_MAX)
1016 goto out_invalid_value;
1017 mnt->nfs_server.port = option;
1018 break;
1019 case Opt_rsize:
1020 string = match_strdup(args);
1021 if (string == NULL)
1022 goto out_nomem;
1023 rc = strict_strtoul(string, 10, &option);
1024 kfree(string);
1025 if (rc != 0)
1026 goto out_invalid_value;
1027 mnt->rsize = option;
1028 break;
1029 case Opt_wsize:
1030 string = match_strdup(args);
1031 if (string == NULL)
1032 goto out_nomem;
1033 rc = strict_strtoul(string, 10, &option);
1034 kfree(string);
1035 if (rc != 0)
1036 goto out_invalid_value;
1037 mnt->wsize = option;
1038 break;
1039 case Opt_bsize:
1040 string = match_strdup(args);
1041 if (string == NULL)
1042 goto out_nomem;
1043 rc = strict_strtoul(string, 10, &option);
1044 kfree(string);
1045 if (rc != 0)
1046 goto out_invalid_value;
1047 mnt->bsize = option;
1048 break;
1049 case Opt_timeo:
1050 string = match_strdup(args);
1051 if (string == NULL)
1052 goto out_nomem;
1053 rc = strict_strtoul(string, 10, &option);
1054 kfree(string);
1055 if (rc != 0 || option == 0)
1056 goto out_invalid_value;
1057 mnt->timeo = option;
1058 break;
1059 case Opt_retrans:
1060 string = match_strdup(args);
1061 if (string == NULL)
1062 goto out_nomem;
1063 rc = strict_strtoul(string, 10, &option);
1064 kfree(string);
1065 if (rc != 0 || option == 0)
1066 goto out_invalid_value;
1067 mnt->retrans = option;
1068 break;
1069 case Opt_acregmin:
1070 string = match_strdup(args);
1071 if (string == NULL)
1072 goto out_nomem;
1073 rc = strict_strtoul(string, 10, &option);
1074 kfree(string);
1075 if (rc != 0)
1076 goto out_invalid_value;
1077 mnt->acregmin = option;
1078 break;
1079 case Opt_acregmax:
1080 string = match_strdup(args);
1081 if (string == NULL)
1082 goto out_nomem;
1083 rc = strict_strtoul(string, 10, &option);
1084 kfree(string);
1085 if (rc != 0)
1086 goto out_invalid_value;
1087 mnt->acregmax = option;
1088 break;
1089 case Opt_acdirmin:
1090 string = match_strdup(args);
1091 if (string == NULL)
1092 goto out_nomem;
1093 rc = strict_strtoul(string, 10, &option);
1094 kfree(string);
1095 if (rc != 0)
1096 goto out_invalid_value;
1097 mnt->acdirmin = option;
1098 break;
1099 case Opt_acdirmax:
1100 string = match_strdup(args);
1101 if (string == NULL)
1102 goto out_nomem;
1103 rc = strict_strtoul(string, 10, &option);
1104 kfree(string);
1105 if (rc != 0)
1106 goto out_invalid_value;
1107 mnt->acdirmax = option;
1108 break;
1109 case Opt_actimeo:
1110 string = match_strdup(args);
1111 if (string == NULL)
1112 goto out_nomem;
1113 rc = strict_strtoul(string, 10, &option);
1114 kfree(string);
1115 if (rc != 0)
1116 goto out_invalid_value;
1117 mnt->acregmin = mnt->acregmax =
1118 mnt->acdirmin = mnt->acdirmax = option;
1119 break;
1120 case Opt_namelen:
1121 string = match_strdup(args);
1122 if (string == NULL)
1123 goto out_nomem;
1124 rc = strict_strtoul(string, 10, &option);
1125 kfree(string);
1126 if (rc != 0)
1127 goto out_invalid_value;
1128 mnt->namlen = option;
1129 break;
1130 case Opt_mountport:
1131 string = match_strdup(args);
1132 if (string == NULL)
1133 goto out_nomem;
1134 rc = strict_strtoul(string, 10, &option);
1135 kfree(string);
1136 if (rc != 0 || option > USHORT_MAX)
1137 goto out_invalid_value;
1138 mnt->mount_server.port = option;
1139 break;
1140 case Opt_mountvers:
1141 string = match_strdup(args);
1142 if (string == NULL)
1143 goto out_nomem;
1144 rc = strict_strtoul(string, 10, &option);
1145 kfree(string);
1146 if (rc != 0 ||
1147 option < NFS_MNT_VERSION ||
1148 option > NFS_MNT3_VERSION)
1149 goto out_invalid_value;
1150 mnt->mount_server.version = option;
1151 break;
1152 case Opt_nfsvers:
1153 string = match_strdup(args);
1154 if (string == NULL)
1155 goto out_nomem;
1156 rc = strict_strtoul(string, 10, &option);
1157 kfree(string);
1158 if (rc != 0)
1159 goto out_invalid_value;
1160 switch (option) {
1161 case NFS2_VERSION:
1162 mnt->flags &= ~NFS_MOUNT_VER3;
1163 mnt->version = 2;
1164 break;
1165 case NFS3_VERSION:
1166 mnt->flags |= NFS_MOUNT_VER3;
1167 mnt->version = 3;
1168 break;
1169 #ifdef CONFIG_NFS_V4
1170 case NFS4_VERSION:
1171 mnt->flags &= ~NFS_MOUNT_VER3;
1172 mnt->version = 4;
1173 break;
1174 #endif
1175 default:
1176 goto out_invalid_value;
1177 }
1178 break;
1179 case Opt_minorversion:
1180 string = match_strdup(args);
1181 if (string == NULL)
1182 goto out_nomem;
1183 rc = strict_strtoul(string, 10, &option);
1184 kfree(string);
1185 if (rc != 0)
1186 goto out_invalid_value;
1187 if (option > NFS4_MAX_MINOR_VERSION)
1188 goto out_invalid_value;
1189 mnt->minorversion = option;
1190 break;
1191
1192 /*
1193 * options that take text values
1194 */
1195 case Opt_sec:
1196 string = match_strdup(args);
1197 if (string == NULL)
1198 goto out_nomem;
1199 rc = nfs_parse_security_flavors(string, mnt);
1200 kfree(string);
1201 if (!rc) {
1202 dfprintk(MOUNT, "NFS: unrecognized "
1203 "security flavor\n");
1204 return 0;
1205 }
1206 break;
1207 case Opt_proto:
1208 string = match_strdup(args);
1209 if (string == NULL)
1210 goto out_nomem;
1211 token = match_token(string,
1212 nfs_xprt_protocol_tokens, args);
1213
1214 switch (token) {
1215 case Opt_xprt_udp:
1216 mnt->flags &= ~NFS_MOUNT_TCP;
1217 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1218 kfree(string);
1219 break;
1220 case Opt_xprt_tcp:
1221 mnt->flags |= NFS_MOUNT_TCP;
1222 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1223 kfree(string);
1224 break;
1225 case Opt_xprt_rdma:
1226 /* vector side protocols to TCP */
1227 mnt->flags |= NFS_MOUNT_TCP;
1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1229 xprt_load_transport(string);
1230 kfree(string);
1231 break;
1232 default:
1233 dfprintk(MOUNT, "NFS: unrecognized "
1234 "transport protocol\n");
1235 return 0;
1236 }
1237 break;
1238 case Opt_mountproto:
1239 string = match_strdup(args);
1240 if (string == NULL)
1241 goto out_nomem;
1242 token = match_token(string,
1243 nfs_xprt_protocol_tokens, args);
1244 kfree(string);
1245
1246 switch (token) {
1247 case Opt_xprt_udp:
1248 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1249 break;
1250 case Opt_xprt_tcp:
1251 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1252 break;
1253 case Opt_xprt_rdma: /* not used for side protocols */
1254 default:
1255 dfprintk(MOUNT, "NFS: unrecognized "
1256 "transport protocol\n");
1257 return 0;
1258 }
1259 break;
1260 case Opt_addr:
1261 string = match_strdup(args);
1262 if (string == NULL)
1263 goto out_nomem;
1264 mnt->nfs_server.addrlen =
1265 rpc_pton(string, strlen(string),
1266 (struct sockaddr *)
1267 &mnt->nfs_server.address,
1268 sizeof(mnt->nfs_server.address));
1269 kfree(string);
1270 if (mnt->nfs_server.addrlen == 0)
1271 goto out_invalid_address;
1272 break;
1273 case Opt_clientaddr:
1274 string = match_strdup(args);
1275 if (string == NULL)
1276 goto out_nomem;
1277 kfree(mnt->client_address);
1278 mnt->client_address = string;
1279 break;
1280 case Opt_mounthost:
1281 string = match_strdup(args);
1282 if (string == NULL)
1283 goto out_nomem;
1284 kfree(mnt->mount_server.hostname);
1285 mnt->mount_server.hostname = string;
1286 break;
1287 case Opt_mountaddr:
1288 string = match_strdup(args);
1289 if (string == NULL)
1290 goto out_nomem;
1291 mnt->mount_server.addrlen =
1292 rpc_pton(string, strlen(string),
1293 (struct sockaddr *)
1294 &mnt->mount_server.address,
1295 sizeof(mnt->mount_server.address));
1296 kfree(string);
1297 if (mnt->mount_server.addrlen == 0)
1298 goto out_invalid_address;
1299 break;
1300 case Opt_lookupcache:
1301 string = match_strdup(args);
1302 if (string == NULL)
1303 goto out_nomem;
1304 token = match_token(string,
1305 nfs_lookupcache_tokens, args);
1306 kfree(string);
1307 switch (token) {
1308 case Opt_lookupcache_all:
1309 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1310 break;
1311 case Opt_lookupcache_positive:
1312 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1313 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1314 break;
1315 case Opt_lookupcache_none:
1316 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1317 break;
1318 default:
1319 dfprintk(MOUNT, "NFS: invalid "
1320 "lookupcache argument\n");
1321 return 0;
1322 };
1323 break;
1324
1325 /*
1326 * Special options
1327 */
1328 case Opt_sloppy:
1329 sloppy = 1;
1330 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1331 break;
1332 case Opt_userspace:
1333 case Opt_deprecated:
1334 dfprintk(MOUNT, "NFS: ignoring mount option "
1335 "'%s'\n", p);
1336 break;
1337
1338 default:
1339 invalid_option = 1;
1340 dfprintk(MOUNT, "NFS: unrecognized mount option "
1341 "'%s'\n", p);
1342 }
1343 }
1344
1345 if (!sloppy && invalid_option)
1346 return 0;
1347
1348 return 1;
1349
1350 out_invalid_address:
1351 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1352 return 0;
1353 out_invalid_value:
1354 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1355 return 0;
1356 out_nomem:
1357 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1358 return 0;
1359 out_security_failure:
1360 free_secdata(secdata);
1361 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1362 return 0;
1363 }
1364
1365 /*
1366 * Match the requested auth flavors with the list returned by
1367 * the server. Returns zero and sets the mount's authentication
1368 * flavor on success; returns -EACCES if server does not support
1369 * the requested flavor.
1370 */
1371 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1372 struct nfs_mount_request *request)
1373 {
1374 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1375
1376 /*
1377 * Certain releases of Linux's mountd return an empty
1378 * flavor list. To prevent behavioral regression with
1379 * these servers (ie. rejecting mounts that used to
1380 * succeed), revert to pre-2.6.32 behavior (no checking)
1381 * if the returned flavor list is empty.
1382 */
1383 if (server_authlist_len == 0)
1384 return 0;
1385
1386 /*
1387 * We avoid sophisticated negotiating here, as there are
1388 * plenty of cases where we can get it wrong, providing
1389 * either too little or too much security.
1390 *
1391 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1392 * flavor listed first. However, some servers list
1393 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1394 * preferred default, in args->auth_flavors[0] if user
1395 * didn't specify sec= mount option.
1396 */
1397 for (i = 0; i < args->auth_flavor_len; i++)
1398 for (j = 0; j < server_authlist_len; j++)
1399 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1400 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1401 request->auth_flavs[j]);
1402 args->auth_flavors[0] = request->auth_flavs[j];
1403 return 0;
1404 }
1405
1406 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1407 nfs_umount(request);
1408 return -EACCES;
1409 }
1410
1411 /*
1412 * Use the remote server's MOUNT service to request the NFS file handle
1413 * corresponding to the provided path.
1414 */
1415 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1416 struct nfs_fh *root_fh)
1417 {
1418 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1419 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1420 struct nfs_mount_request request = {
1421 .sap = (struct sockaddr *)
1422 &args->mount_server.address,
1423 .dirpath = args->nfs_server.export_path,
1424 .protocol = args->mount_server.protocol,
1425 .fh = root_fh,
1426 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1427 .auth_flav_len = &server_authlist_len,
1428 .auth_flavs = server_authlist,
1429 };
1430 int status;
1431
1432 if (args->mount_server.version == 0) {
1433 if (args->flags & NFS_MOUNT_VER3)
1434 args->mount_server.version = NFS_MNT3_VERSION;
1435 else
1436 args->mount_server.version = NFS_MNT_VERSION;
1437 }
1438 request.version = args->mount_server.version;
1439
1440 if (args->mount_server.hostname)
1441 request.hostname = args->mount_server.hostname;
1442 else
1443 request.hostname = args->nfs_server.hostname;
1444
1445 /*
1446 * Construct the mount server's address.
1447 */
1448 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1449 memcpy(request.sap, &args->nfs_server.address,
1450 args->nfs_server.addrlen);
1451 args->mount_server.addrlen = args->nfs_server.addrlen;
1452 }
1453 request.salen = args->mount_server.addrlen;
1454 nfs_set_default_port(request.sap, args->mount_server.port, 0);
1455
1456 /*
1457 * Now ask the mount server to map our export path
1458 * to a file handle.
1459 */
1460 status = nfs_mount(&request);
1461 if (status != 0) {
1462 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1463 request.hostname, status);
1464 return status;
1465 }
1466
1467 /*
1468 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1469 */
1470 if (args->mount_server.version != NFS_MNT3_VERSION)
1471 return 0;
1472 return nfs_walk_authlist(args, &request);
1473 }
1474
1475 static int nfs_parse_simple_hostname(const char *dev_name,
1476 char **hostname, size_t maxnamlen,
1477 char **export_path, size_t maxpathlen)
1478 {
1479 size_t len;
1480 char *colon, *comma;
1481
1482 colon = strchr(dev_name, ':');
1483 if (colon == NULL)
1484 goto out_bad_devname;
1485
1486 len = colon - dev_name;
1487 if (len > maxnamlen)
1488 goto out_hostname;
1489
1490 /* N.B. caller will free nfs_server.hostname in all cases */
1491 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1492 if (!*hostname)
1493 goto out_nomem;
1494
1495 /* kill possible hostname list: not supported */
1496 comma = strchr(*hostname, ',');
1497 if (comma != NULL) {
1498 if (comma == *hostname)
1499 goto out_bad_devname;
1500 *comma = '\0';
1501 }
1502
1503 colon++;
1504 len = strlen(colon);
1505 if (len > maxpathlen)
1506 goto out_path;
1507 *export_path = kstrndup(colon, len, GFP_KERNEL);
1508 if (!*export_path)
1509 goto out_nomem;
1510
1511 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1512 return 0;
1513
1514 out_bad_devname:
1515 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1516 return -EINVAL;
1517
1518 out_nomem:
1519 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1520 return -ENOMEM;
1521
1522 out_hostname:
1523 dfprintk(MOUNT, "NFS: server hostname too long\n");
1524 return -ENAMETOOLONG;
1525
1526 out_path:
1527 dfprintk(MOUNT, "NFS: export pathname too long\n");
1528 return -ENAMETOOLONG;
1529 }
1530
1531 /*
1532 * Hostname has square brackets around it because it contains one or
1533 * more colons. We look for the first closing square bracket, and a
1534 * colon must follow it.
1535 */
1536 static int nfs_parse_protected_hostname(const char *dev_name,
1537 char **hostname, size_t maxnamlen,
1538 char **export_path, size_t maxpathlen)
1539 {
1540 size_t len;
1541 char *start, *end;
1542
1543 start = (char *)(dev_name + 1);
1544
1545 end = strchr(start, ']');
1546 if (end == NULL)
1547 goto out_bad_devname;
1548 if (*(end + 1) != ':')
1549 goto out_bad_devname;
1550
1551 len = end - start;
1552 if (len > maxnamlen)
1553 goto out_hostname;
1554
1555 /* N.B. caller will free nfs_server.hostname in all cases */
1556 *hostname = kstrndup(start, len, GFP_KERNEL);
1557 if (*hostname == NULL)
1558 goto out_nomem;
1559
1560 end += 2;
1561 len = strlen(end);
1562 if (len > maxpathlen)
1563 goto out_path;
1564 *export_path = kstrndup(end, len, GFP_KERNEL);
1565 if (!*export_path)
1566 goto out_nomem;
1567
1568 return 0;
1569
1570 out_bad_devname:
1571 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1572 return -EINVAL;
1573
1574 out_nomem:
1575 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1576 return -ENOMEM;
1577
1578 out_hostname:
1579 dfprintk(MOUNT, "NFS: server hostname too long\n");
1580 return -ENAMETOOLONG;
1581
1582 out_path:
1583 dfprintk(MOUNT, "NFS: export pathname too long\n");
1584 return -ENAMETOOLONG;
1585 }
1586
1587 /*
1588 * Split "dev_name" into "hostname:export_path".
1589 *
1590 * The leftmost colon demarks the split between the server's hostname
1591 * and the export path. If the hostname starts with a left square
1592 * bracket, then it may contain colons.
1593 *
1594 * Note: caller frees hostname and export path, even on error.
1595 */
1596 static int nfs_parse_devname(const char *dev_name,
1597 char **hostname, size_t maxnamlen,
1598 char **export_path, size_t maxpathlen)
1599 {
1600 if (*dev_name == '[')
1601 return nfs_parse_protected_hostname(dev_name,
1602 hostname, maxnamlen,
1603 export_path, maxpathlen);
1604
1605 return nfs_parse_simple_hostname(dev_name,
1606 hostname, maxnamlen,
1607 export_path, maxpathlen);
1608 }
1609
1610 /*
1611 * Validate the NFS2/NFS3 mount data
1612 * - fills in the mount root filehandle
1613 *
1614 * For option strings, user space handles the following behaviors:
1615 *
1616 * + DNS: mapping server host name to IP address ("addr=" option)
1617 *
1618 * + failure mode: how to behave if a mount request can't be handled
1619 * immediately ("fg/bg" option)
1620 *
1621 * + retry: how often to retry a mount request ("retry=" option)
1622 *
1623 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1624 * mountproto=tcp after mountproto=udp, and so on
1625 */
1626 static int nfs_validate_mount_data(void *options,
1627 struct nfs_parsed_mount_data *args,
1628 struct nfs_fh *mntfh,
1629 const char *dev_name)
1630 {
1631 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1632 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1633
1634 if (data == NULL)
1635 goto out_no_data;
1636
1637 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1638 args->rsize = NFS_MAX_FILE_IO_SIZE;
1639 args->wsize = NFS_MAX_FILE_IO_SIZE;
1640 args->acregmin = NFS_DEF_ACREGMIN;
1641 args->acregmax = NFS_DEF_ACREGMAX;
1642 args->acdirmin = NFS_DEF_ACDIRMIN;
1643 args->acdirmax = NFS_DEF_ACDIRMAX;
1644 args->mount_server.port = NFS_UNSPEC_PORT;
1645 args->nfs_server.port = NFS_UNSPEC_PORT;
1646 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1647 args->auth_flavors[0] = RPC_AUTH_UNIX;
1648 args->auth_flavor_len = 1;
1649 args->minorversion = 0;
1650
1651 switch (data->version) {
1652 case 1:
1653 data->namlen = 0;
1654 case 2:
1655 data->bsize = 0;
1656 case 3:
1657 if (data->flags & NFS_MOUNT_VER3)
1658 goto out_no_v3;
1659 data->root.size = NFS2_FHSIZE;
1660 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1661 case 4:
1662 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1663 goto out_no_sec;
1664 case 5:
1665 memset(data->context, 0, sizeof(data->context));
1666 case 6:
1667 if (data->flags & NFS_MOUNT_VER3) {
1668 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1669 goto out_invalid_fh;
1670 mntfh->size = data->root.size;
1671 args->version = 3;
1672 } else {
1673 mntfh->size = NFS2_FHSIZE;
1674 args->version = 2;
1675 }
1676
1677
1678 memcpy(mntfh->data, data->root.data, mntfh->size);
1679 if (mntfh->size < sizeof(mntfh->data))
1680 memset(mntfh->data + mntfh->size, 0,
1681 sizeof(mntfh->data) - mntfh->size);
1682
1683 /*
1684 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1685 * can deal with.
1686 */
1687 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1688 args->rsize = data->rsize;
1689 args->wsize = data->wsize;
1690 args->timeo = data->timeo;
1691 args->retrans = data->retrans;
1692 args->acregmin = data->acregmin;
1693 args->acregmax = data->acregmax;
1694 args->acdirmin = data->acdirmin;
1695 args->acdirmax = data->acdirmax;
1696
1697 memcpy(sap, &data->addr, sizeof(data->addr));
1698 args->nfs_server.addrlen = sizeof(data->addr);
1699 if (!nfs_verify_server_address(sap))
1700 goto out_no_address;
1701
1702 if (!(data->flags & NFS_MOUNT_TCP))
1703 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1704 /* N.B. caller will free nfs_server.hostname in all cases */
1705 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1706 args->namlen = data->namlen;
1707 args->bsize = data->bsize;
1708
1709 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1710 args->auth_flavors[0] = data->pseudoflavor;
1711 if (!args->nfs_server.hostname)
1712 goto out_nomem;
1713
1714 /*
1715 * The legacy version 6 binary mount data from userspace has a
1716 * field used only to transport selinux information into the
1717 * the kernel. To continue to support that functionality we
1718 * have a touch of selinux knowledge here in the NFS code. The
1719 * userspace code converted context=blah to just blah so we are
1720 * converting back to the full string selinux understands.
1721 */
1722 if (data->context[0]){
1723 #ifdef CONFIG_SECURITY_SELINUX
1724 int rc;
1725 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1726 if (!opts_str)
1727 return -ENOMEM;
1728 strcpy(opts_str, "context=");
1729 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1730 strcat(opts_str, &data->context[0]);
1731 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1732 kfree(opts_str);
1733 if (rc)
1734 return rc;
1735 #else
1736 return -EINVAL;
1737 #endif
1738 }
1739
1740 break;
1741 default: {
1742 int status;
1743
1744 if (nfs_parse_mount_options((char *)options, args) == 0)
1745 return -EINVAL;
1746
1747 if (!nfs_verify_server_address(sap))
1748 goto out_no_address;
1749
1750 if (args->version == 4)
1751 #ifdef CONFIG_NFS_V4
1752 return nfs4_validate_text_mount_data(options,
1753 args, dev_name);
1754 #else
1755 goto out_v4_not_compiled;
1756 #endif
1757
1758 nfs_set_default_port(sap, args->nfs_server.port, 0);
1759
1760 nfs_set_mount_transport_protocol(args);
1761
1762 status = nfs_parse_devname(dev_name,
1763 &args->nfs_server.hostname,
1764 PAGE_SIZE,
1765 &args->nfs_server.export_path,
1766 NFS_MAXPATHLEN);
1767 if (!status)
1768 status = nfs_try_mount(args, mntfh);
1769
1770 kfree(args->nfs_server.export_path);
1771 args->nfs_server.export_path = NULL;
1772
1773 if (status)
1774 return status;
1775
1776 break;
1777 }
1778 }
1779
1780 #ifndef CONFIG_NFS_V3
1781 if (args->flags & NFS_MOUNT_VER3)
1782 goto out_v3_not_compiled;
1783 #endif /* !CONFIG_NFS_V3 */
1784
1785 return 0;
1786
1787 out_no_data:
1788 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1789 return -EINVAL;
1790
1791 out_no_v3:
1792 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1793 data->version);
1794 return -EINVAL;
1795
1796 out_no_sec:
1797 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1798 return -EINVAL;
1799
1800 #ifndef CONFIG_NFS_V3
1801 out_v3_not_compiled:
1802 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1803 return -EPROTONOSUPPORT;
1804 #endif /* !CONFIG_NFS_V3 */
1805
1806 #ifndef CONFIG_NFS_V4
1807 out_v4_not_compiled:
1808 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1809 return -EPROTONOSUPPORT;
1810 #endif /* !CONFIG_NFS_V4 */
1811
1812 out_nomem:
1813 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1814 return -ENOMEM;
1815
1816 out_no_address:
1817 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1818 return -EINVAL;
1819
1820 out_invalid_fh:
1821 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1822 return -EINVAL;
1823 }
1824
1825 static int
1826 nfs_compare_remount_data(struct nfs_server *nfss,
1827 struct nfs_parsed_mount_data *data)
1828 {
1829 if (data->flags != nfss->flags ||
1830 data->rsize != nfss->rsize ||
1831 data->wsize != nfss->wsize ||
1832 data->retrans != nfss->client->cl_timeout->to_retries ||
1833 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1834 data->acregmin != nfss->acregmin / HZ ||
1835 data->acregmax != nfss->acregmax / HZ ||
1836 data->acdirmin != nfss->acdirmin / HZ ||
1837 data->acdirmax != nfss->acdirmax / HZ ||
1838 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1839 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1840 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1841 data->nfs_server.addrlen) != 0)
1842 return -EINVAL;
1843
1844 return 0;
1845 }
1846
1847 static int
1848 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1849 {
1850 int error;
1851 struct nfs_server *nfss = sb->s_fs_info;
1852 struct nfs_parsed_mount_data *data;
1853 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1854 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1855 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1856
1857 /*
1858 * Userspace mount programs that send binary options generally send
1859 * them populated with default values. We have no way to know which
1860 * ones were explicitly specified. Fall back to legacy behavior and
1861 * just return success.
1862 */
1863 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1864 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1865 options->version <= 6))))
1866 return 0;
1867
1868 data = kzalloc(sizeof(*data), GFP_KERNEL);
1869 if (data == NULL)
1870 return -ENOMEM;
1871
1872 lock_kernel();
1873 /* fill out struct with values from existing mount */
1874 data->flags = nfss->flags;
1875 data->rsize = nfss->rsize;
1876 data->wsize = nfss->wsize;
1877 data->retrans = nfss->client->cl_timeout->to_retries;
1878 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1879 data->acregmin = nfss->acregmin / HZ;
1880 data->acregmax = nfss->acregmax / HZ;
1881 data->acdirmin = nfss->acdirmin / HZ;
1882 data->acdirmax = nfss->acdirmax / HZ;
1883 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1884 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1885 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1886 data->nfs_server.addrlen);
1887
1888 /* overwrite those values with any that were specified */
1889 error = nfs_parse_mount_options((char *)options, data);
1890 if (error < 0)
1891 goto out;
1892
1893 /* compare new mount options with old ones */
1894 error = nfs_compare_remount_data(nfss, data);
1895 out:
1896 kfree(data);
1897 unlock_kernel();
1898 return error;
1899 }
1900
1901 /*
1902 * Initialise the common bits of the superblock
1903 */
1904 static inline void nfs_initialise_sb(struct super_block *sb)
1905 {
1906 struct nfs_server *server = NFS_SB(sb);
1907
1908 sb->s_magic = NFS_SUPER_MAGIC;
1909
1910 /* We probably want something more informative here */
1911 snprintf(sb->s_id, sizeof(sb->s_id),
1912 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1913
1914 if (sb->s_blocksize == 0)
1915 sb->s_blocksize = nfs_block_bits(server->wsize,
1916 &sb->s_blocksize_bits);
1917
1918 if (server->flags & NFS_MOUNT_NOAC)
1919 sb->s_flags |= MS_SYNCHRONOUS;
1920
1921 nfs_super_set_maxbytes(sb, server->maxfilesize);
1922 }
1923
1924 /*
1925 * Finish setting up an NFS2/3 superblock
1926 */
1927 static void nfs_fill_super(struct super_block *sb,
1928 struct nfs_parsed_mount_data *data)
1929 {
1930 struct nfs_server *server = NFS_SB(sb);
1931
1932 sb->s_blocksize_bits = 0;
1933 sb->s_blocksize = 0;
1934 if (data->bsize)
1935 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1936
1937 if (server->flags & NFS_MOUNT_VER3) {
1938 /* The VFS shouldn't apply the umask to mode bits. We will do
1939 * so ourselves when necessary.
1940 */
1941 sb->s_flags |= MS_POSIXACL;
1942 sb->s_time_gran = 1;
1943 }
1944
1945 sb->s_op = &nfs_sops;
1946 nfs_initialise_sb(sb);
1947 }
1948
1949 /*
1950 * Finish setting up a cloned NFS2/3 superblock
1951 */
1952 static void nfs_clone_super(struct super_block *sb,
1953 const struct super_block *old_sb)
1954 {
1955 struct nfs_server *server = NFS_SB(sb);
1956
1957 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1958 sb->s_blocksize = old_sb->s_blocksize;
1959 sb->s_maxbytes = old_sb->s_maxbytes;
1960
1961 if (server->flags & NFS_MOUNT_VER3) {
1962 /* The VFS shouldn't apply the umask to mode bits. We will do
1963 * so ourselves when necessary.
1964 */
1965 sb->s_flags |= MS_POSIXACL;
1966 sb->s_time_gran = 1;
1967 }
1968
1969 sb->s_op = old_sb->s_op;
1970 nfs_initialise_sb(sb);
1971 }
1972
1973 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1974 {
1975 const struct nfs_server *a = s->s_fs_info;
1976 const struct rpc_clnt *clnt_a = a->client;
1977 const struct rpc_clnt *clnt_b = b->client;
1978
1979 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1980 goto Ebusy;
1981 if (a->nfs_client != b->nfs_client)
1982 goto Ebusy;
1983 if (a->flags != b->flags)
1984 goto Ebusy;
1985 if (a->wsize != b->wsize)
1986 goto Ebusy;
1987 if (a->rsize != b->rsize)
1988 goto Ebusy;
1989 if (a->acregmin != b->acregmin)
1990 goto Ebusy;
1991 if (a->acregmax != b->acregmax)
1992 goto Ebusy;
1993 if (a->acdirmin != b->acdirmin)
1994 goto Ebusy;
1995 if (a->acdirmax != b->acdirmax)
1996 goto Ebusy;
1997 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1998 goto Ebusy;
1999 return 1;
2000 Ebusy:
2001 return 0;
2002 }
2003
2004 struct nfs_sb_mountdata {
2005 struct nfs_server *server;
2006 int mntflags;
2007 };
2008
2009 static int nfs_set_super(struct super_block *s, void *data)
2010 {
2011 struct nfs_sb_mountdata *sb_mntdata = data;
2012 struct nfs_server *server = sb_mntdata->server;
2013 int ret;
2014
2015 s->s_flags = sb_mntdata->mntflags;
2016 s->s_fs_info = server;
2017 ret = set_anon_super(s, server);
2018 if (ret == 0)
2019 server->s_dev = s->s_dev;
2020 return ret;
2021 }
2022
2023 static int nfs_compare_super_address(struct nfs_server *server1,
2024 struct nfs_server *server2)
2025 {
2026 struct sockaddr *sap1, *sap2;
2027
2028 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2029 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2030
2031 if (sap1->sa_family != sap2->sa_family)
2032 return 0;
2033
2034 switch (sap1->sa_family) {
2035 case AF_INET: {
2036 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2037 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2038 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2039 return 0;
2040 if (sin1->sin_port != sin2->sin_port)
2041 return 0;
2042 break;
2043 }
2044 case AF_INET6: {
2045 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2046 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2047 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2048 return 0;
2049 if (sin1->sin6_port != sin2->sin6_port)
2050 return 0;
2051 break;
2052 }
2053 default:
2054 return 0;
2055 }
2056
2057 return 1;
2058 }
2059
2060 static int nfs_compare_super(struct super_block *sb, void *data)
2061 {
2062 struct nfs_sb_mountdata *sb_mntdata = data;
2063 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2064 int mntflags = sb_mntdata->mntflags;
2065
2066 if (!nfs_compare_super_address(old, server))
2067 return 0;
2068 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2069 if (old->flags & NFS_MOUNT_UNSHARED)
2070 return 0;
2071 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2072 return 0;
2073 return nfs_compare_mount_options(sb, server, mntflags);
2074 }
2075
2076 static int nfs_bdi_register(struct nfs_server *server)
2077 {
2078 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2079 }
2080
2081 static int nfs_get_sb(struct file_system_type *fs_type,
2082 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2083 {
2084 struct nfs_server *server = NULL;
2085 struct super_block *s;
2086 struct nfs_parsed_mount_data *data;
2087 struct nfs_fh *mntfh;
2088 struct dentry *mntroot;
2089 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2090 struct nfs_sb_mountdata sb_mntdata = {
2091 .mntflags = flags,
2092 };
2093 int error = -ENOMEM;
2094
2095 data = kzalloc(sizeof(*data), GFP_KERNEL);
2096 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2097 if (data == NULL || mntfh == NULL)
2098 goto out_free_fh;
2099
2100 security_init_mnt_opts(&data->lsm_opts);
2101
2102 /* Validate the mount data */
2103 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2104 if (error < 0)
2105 goto out;
2106
2107 #ifdef CONFIG_NFS_V4
2108 if (data->version == 4) {
2109 error = nfs4_try_mount(flags, dev_name, data, mnt);
2110 kfree(data->client_address);
2111 goto out;
2112 }
2113 #endif /* CONFIG_NFS_V4 */
2114
2115 /* Get a volume representation */
2116 server = nfs_create_server(data, mntfh);
2117 if (IS_ERR(server)) {
2118 error = PTR_ERR(server);
2119 goto out;
2120 }
2121 sb_mntdata.server = server;
2122
2123 if (server->flags & NFS_MOUNT_UNSHARED)
2124 compare_super = NULL;
2125
2126 /* Get a superblock - note that we may end up sharing one that already exists */
2127 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2128 if (IS_ERR(s)) {
2129 error = PTR_ERR(s);
2130 goto out_err_nosb;
2131 }
2132
2133 if (s->s_fs_info != server) {
2134 nfs_free_server(server);
2135 server = NULL;
2136 } else {
2137 error = nfs_bdi_register(server);
2138 if (error)
2139 goto error_splat_super;
2140 }
2141
2142 if (!s->s_root) {
2143 /* initial superblock/root creation */
2144 nfs_fill_super(s, data);
2145 nfs_fscache_get_super_cookie(s, data);
2146 }
2147
2148 mntroot = nfs_get_root(s, mntfh);
2149 if (IS_ERR(mntroot)) {
2150 error = PTR_ERR(mntroot);
2151 goto error_splat_super;
2152 }
2153
2154 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2155 if (error)
2156 goto error_splat_root;
2157
2158 s->s_flags |= MS_ACTIVE;
2159 mnt->mnt_sb = s;
2160 mnt->mnt_root = mntroot;
2161 error = 0;
2162
2163 out:
2164 kfree(data->nfs_server.hostname);
2165 kfree(data->mount_server.hostname);
2166 kfree(data->fscache_uniq);
2167 security_free_mnt_opts(&data->lsm_opts);
2168 out_free_fh:
2169 kfree(mntfh);
2170 kfree(data);
2171 return error;
2172
2173 out_err_nosb:
2174 nfs_free_server(server);
2175 goto out;
2176
2177 error_splat_root:
2178 dput(mntroot);
2179 error_splat_super:
2180 deactivate_locked_super(s);
2181 goto out;
2182 }
2183
2184 /*
2185 * Destroy an NFS2/3 superblock
2186 */
2187 static void nfs_kill_super(struct super_block *s)
2188 {
2189 struct nfs_server *server = NFS_SB(s);
2190
2191 bdi_unregister(&server->backing_dev_info);
2192 kill_anon_super(s);
2193 nfs_fscache_release_super_cookie(s);
2194 nfs_free_server(server);
2195 }
2196
2197 /*
2198 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2199 */
2200 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2201 const char *dev_name, void *raw_data,
2202 struct vfsmount *mnt)
2203 {
2204 struct nfs_clone_mount *data = raw_data;
2205 struct super_block *s;
2206 struct nfs_server *server;
2207 struct dentry *mntroot;
2208 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2209 struct nfs_sb_mountdata sb_mntdata = {
2210 .mntflags = flags,
2211 };
2212 int error;
2213
2214 dprintk("--> nfs_xdev_get_sb()\n");
2215
2216 /* create a new volume representation */
2217 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2218 if (IS_ERR(server)) {
2219 error = PTR_ERR(server);
2220 goto out_err_noserver;
2221 }
2222 sb_mntdata.server = server;
2223
2224 if (server->flags & NFS_MOUNT_UNSHARED)
2225 compare_super = NULL;
2226
2227 /* Get a superblock - note that we may end up sharing one that already exists */
2228 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2229 if (IS_ERR(s)) {
2230 error = PTR_ERR(s);
2231 goto out_err_nosb;
2232 }
2233
2234 if (s->s_fs_info != server) {
2235 nfs_free_server(server);
2236 server = NULL;
2237 } else {
2238 error = nfs_bdi_register(server);
2239 if (error)
2240 goto error_splat_super;
2241 }
2242
2243 if (!s->s_root) {
2244 /* initial superblock/root creation */
2245 nfs_clone_super(s, data->sb);
2246 }
2247
2248 mntroot = nfs_get_root(s, data->fh);
2249 if (IS_ERR(mntroot)) {
2250 error = PTR_ERR(mntroot);
2251 goto error_splat_super;
2252 }
2253 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2254 dput(mntroot);
2255 error = -ESTALE;
2256 goto error_splat_super;
2257 }
2258
2259 s->s_flags |= MS_ACTIVE;
2260 mnt->mnt_sb = s;
2261 mnt->mnt_root = mntroot;
2262
2263 /* clone any lsm security options from the parent to the new sb */
2264 security_sb_clone_mnt_opts(data->sb, s);
2265
2266 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2267 return 0;
2268
2269 out_err_nosb:
2270 nfs_free_server(server);
2271 out_err_noserver:
2272 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2273 return error;
2274
2275 error_splat_super:
2276 deactivate_locked_super(s);
2277 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2278 return error;
2279 }
2280
2281 #ifdef CONFIG_NFS_V4
2282
2283 /*
2284 * Finish setting up a cloned NFS4 superblock
2285 */
2286 static void nfs4_clone_super(struct super_block *sb,
2287 const struct super_block *old_sb)
2288 {
2289 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2290 sb->s_blocksize = old_sb->s_blocksize;
2291 sb->s_maxbytes = old_sb->s_maxbytes;
2292 sb->s_time_gran = 1;
2293 sb->s_op = old_sb->s_op;
2294 nfs_initialise_sb(sb);
2295 }
2296
2297 /*
2298 * Set up an NFS4 superblock
2299 */
2300 static void nfs4_fill_super(struct super_block *sb)
2301 {
2302 sb->s_time_gran = 1;
2303 sb->s_op = &nfs4_sops;
2304 nfs_initialise_sb(sb);
2305 }
2306
2307 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2308 {
2309 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2310 }
2311
2312 static int nfs4_validate_text_mount_data(void *options,
2313 struct nfs_parsed_mount_data *args,
2314 const char *dev_name)
2315 {
2316 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2317
2318 nfs_set_default_port(sap, args->nfs_server.port, NFS_PORT);
2319
2320 nfs_validate_transport_protocol(args);
2321
2322 nfs4_validate_mount_flags(args);
2323
2324 if (args->version != 4) {
2325 dfprintk(MOUNT,
2326 "NFS4: Illegal mount version\n");
2327 return -EINVAL;
2328 }
2329
2330 if (args->auth_flavor_len > 1) {
2331 dfprintk(MOUNT,
2332 "NFS4: Too many RPC auth flavours specified\n");
2333 return -EINVAL;
2334 }
2335
2336 if (args->client_address == NULL) {
2337 dfprintk(MOUNT,
2338 "NFS4: mount program didn't pass callback address\n");
2339 return -EINVAL;
2340 }
2341
2342 return nfs_parse_devname(dev_name,
2343 &args->nfs_server.hostname,
2344 NFS4_MAXNAMLEN,
2345 &args->nfs_server.export_path,
2346 NFS4_MAXPATHLEN);
2347 }
2348
2349 /*
2350 * Validate NFSv4 mount options
2351 */
2352 static int nfs4_validate_mount_data(void *options,
2353 struct nfs_parsed_mount_data *args,
2354 const char *dev_name)
2355 {
2356 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2357 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2358 char *c;
2359
2360 if (data == NULL)
2361 goto out_no_data;
2362
2363 args->rsize = NFS_MAX_FILE_IO_SIZE;
2364 args->wsize = NFS_MAX_FILE_IO_SIZE;
2365 args->acregmin = NFS_DEF_ACREGMIN;
2366 args->acregmax = NFS_DEF_ACREGMAX;
2367 args->acdirmin = NFS_DEF_ACDIRMIN;
2368 args->acdirmax = NFS_DEF_ACDIRMAX;
2369 args->nfs_server.port = NFS_UNSPEC_PORT;
2370 args->auth_flavors[0] = RPC_AUTH_UNIX;
2371 args->auth_flavor_len = 1;
2372 args->version = 4;
2373 args->minorversion = 0;
2374
2375 switch (data->version) {
2376 case 1:
2377 if (data->host_addrlen > sizeof(args->nfs_server.address))
2378 goto out_no_address;
2379 if (data->host_addrlen == 0)
2380 goto out_no_address;
2381 args->nfs_server.addrlen = data->host_addrlen;
2382 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2383 return -EFAULT;
2384 if (!nfs_verify_server_address(sap))
2385 goto out_no_address;
2386
2387 if (data->auth_flavourlen) {
2388 if (data->auth_flavourlen > 1)
2389 goto out_inval_auth;
2390 if (copy_from_user(&args->auth_flavors[0],
2391 data->auth_flavours,
2392 sizeof(args->auth_flavors[0])))
2393 return -EFAULT;
2394 }
2395
2396 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2397 if (IS_ERR(c))
2398 return PTR_ERR(c);
2399 args->nfs_server.hostname = c;
2400
2401 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2402 if (IS_ERR(c))
2403 return PTR_ERR(c);
2404 args->nfs_server.export_path = c;
2405 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2406
2407 c = strndup_user(data->client_addr.data, 16);
2408 if (IS_ERR(c))
2409 return PTR_ERR(c);
2410 args->client_address = c;
2411
2412 /*
2413 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2414 * can deal with.
2415 */
2416
2417 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2418 args->rsize = data->rsize;
2419 args->wsize = data->wsize;
2420 args->timeo = data->timeo;
2421 args->retrans = data->retrans;
2422 args->acregmin = data->acregmin;
2423 args->acregmax = data->acregmax;
2424 args->acdirmin = data->acdirmin;
2425 args->acdirmax = data->acdirmax;
2426 args->nfs_server.protocol = data->proto;
2427 nfs_validate_transport_protocol(args);
2428
2429 break;
2430 default:
2431 if (nfs_parse_mount_options((char *)options, args) == 0)
2432 return -EINVAL;
2433
2434 if (!nfs_verify_server_address(sap))
2435 return -EINVAL;
2436
2437 return nfs4_validate_text_mount_data(options, args, dev_name);
2438 }
2439
2440 return 0;
2441
2442 out_no_data:
2443 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2444 return -EINVAL;
2445
2446 out_inval_auth:
2447 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2448 data->auth_flavourlen);
2449 return -EINVAL;
2450
2451 out_no_address:
2452 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2453 return -EINVAL;
2454 }
2455
2456 /*
2457 * Get the superblock for the NFS4 root partition
2458 */
2459 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2460 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2461 {
2462 struct nfs_parsed_mount_data *data = raw_data;
2463 struct super_block *s;
2464 struct nfs_server *server;
2465 struct nfs_fh *mntfh;
2466 struct dentry *mntroot;
2467 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2468 struct nfs_sb_mountdata sb_mntdata = {
2469 .mntflags = flags,
2470 };
2471 int error = -ENOMEM;
2472
2473 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2474 if (data == NULL || mntfh == NULL)
2475 goto out_free_fh;
2476
2477 security_init_mnt_opts(&data->lsm_opts);
2478
2479 /* Get a volume representation */
2480 server = nfs4_create_server(data, mntfh);
2481 if (IS_ERR(server)) {
2482 error = PTR_ERR(server);
2483 goto out;
2484 }
2485 sb_mntdata.server = server;
2486
2487 if (server->flags & NFS4_MOUNT_UNSHARED)
2488 compare_super = NULL;
2489
2490 /* Get a superblock - note that we may end up sharing one that already exists */
2491 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2492 if (IS_ERR(s)) {
2493 error = PTR_ERR(s);
2494 goto out_free;
2495 }
2496
2497 if (s->s_fs_info != server) {
2498 nfs_free_server(server);
2499 server = NULL;
2500 } else {
2501 error = nfs_bdi_register(server);
2502 if (error)
2503 goto error_splat_super;
2504 }
2505
2506 if (!s->s_root) {
2507 /* initial superblock/root creation */
2508 nfs4_fill_super(s);
2509 nfs_fscache_get_super_cookie(s, data);
2510 }
2511
2512 mntroot = nfs4_get_root(s, mntfh);
2513 if (IS_ERR(mntroot)) {
2514 error = PTR_ERR(mntroot);
2515 goto error_splat_super;
2516 }
2517
2518 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2519 if (error)
2520 goto error_splat_root;
2521
2522 s->s_flags |= MS_ACTIVE;
2523 mnt->mnt_sb = s;
2524 mnt->mnt_root = mntroot;
2525 error = 0;
2526
2527 out:
2528 security_free_mnt_opts(&data->lsm_opts);
2529 out_free_fh:
2530 kfree(mntfh);
2531 return error;
2532
2533 out_free:
2534 nfs_free_server(server);
2535 goto out;
2536
2537 error_splat_root:
2538 dput(mntroot);
2539 error_splat_super:
2540 deactivate_locked_super(s);
2541 goto out;
2542 }
2543
2544 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2545 int flags, void *data, const char *hostname)
2546 {
2547 struct vfsmount *root_mnt;
2548 char *root_devname;
2549 size_t len;
2550
2551 len = strlen(hostname) + 3;
2552 root_devname = kmalloc(len, GFP_KERNEL);
2553 if (root_devname == NULL)
2554 return ERR_PTR(-ENOMEM);
2555 snprintf(root_devname, len, "%s:/", hostname);
2556 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2557 kfree(root_devname);
2558 return root_mnt;
2559 }
2560
2561 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2562 {
2563 char *page = (char *) __get_free_page(GFP_KERNEL);
2564 char *devname, *tmp;
2565
2566 if (page == NULL)
2567 return;
2568 devname = nfs_path(path->mnt->mnt_devname,
2569 path->mnt->mnt_root, path->dentry,
2570 page, PAGE_SIZE);
2571 if (devname == NULL)
2572 goto out_freepage;
2573 tmp = kstrdup(devname, GFP_KERNEL);
2574 if (tmp == NULL)
2575 goto out_freepage;
2576 kfree(mnt->mnt_devname);
2577 mnt->mnt_devname = tmp;
2578 out_freepage:
2579 free_page((unsigned long)page);
2580 }
2581
2582 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2583 const char *export_path, struct vfsmount *mnt_target)
2584 {
2585 struct mnt_namespace *ns_private;
2586 struct nameidata nd;
2587 struct super_block *s;
2588 int ret;
2589
2590 ns_private = create_mnt_ns(root_mnt);
2591 ret = PTR_ERR(ns_private);
2592 if (IS_ERR(ns_private))
2593 goto out_mntput;
2594
2595 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2596 export_path, LOOKUP_FOLLOW, &nd);
2597
2598 put_mnt_ns(ns_private);
2599
2600 if (ret != 0)
2601 goto out_err;
2602
2603 s = nd.path.mnt->mnt_sb;
2604 atomic_inc(&s->s_active);
2605 mnt_target->mnt_sb = s;
2606 mnt_target->mnt_root = dget(nd.path.dentry);
2607
2608 /* Correct the device pathname */
2609 nfs_fix_devname(&nd.path, mnt_target);
2610
2611 path_put(&nd.path);
2612 down_write(&s->s_umount);
2613 return 0;
2614 out_mntput:
2615 mntput(root_mnt);
2616 out_err:
2617 return ret;
2618 }
2619
2620 static int nfs4_try_mount(int flags, const char *dev_name,
2621 struct nfs_parsed_mount_data *data,
2622 struct vfsmount *mnt)
2623 {
2624 char *export_path;
2625 struct vfsmount *root_mnt;
2626 int error;
2627
2628 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2629
2630 export_path = data->nfs_server.export_path;
2631 data->nfs_server.export_path = "/";
2632 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2633 data->nfs_server.hostname);
2634 data->nfs_server.export_path = export_path;
2635
2636 error = PTR_ERR(root_mnt);
2637 if (IS_ERR(root_mnt))
2638 goto out;
2639
2640 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2641
2642 out:
2643 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2644 error != 0 ? " [error]" : "");
2645 return error;
2646 }
2647
2648 /*
2649 * Get the superblock for an NFS4 mountpoint
2650 */
2651 static int nfs4_get_sb(struct file_system_type *fs_type,
2652 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2653 {
2654 struct nfs_parsed_mount_data *data;
2655 int error = -ENOMEM;
2656
2657 data = kzalloc(sizeof(*data), GFP_KERNEL);
2658 if (data == NULL)
2659 goto out_free_data;
2660
2661 /* Validate the mount data */
2662 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2663 if (error < 0)
2664 goto out;
2665
2666 error = nfs4_try_mount(flags, dev_name, data, mnt);
2667
2668 out:
2669 kfree(data->client_address);
2670 kfree(data->nfs_server.export_path);
2671 kfree(data->nfs_server.hostname);
2672 kfree(data->fscache_uniq);
2673 out_free_data:
2674 kfree(data);
2675 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2676 error != 0 ? " [error]" : "");
2677 return error;
2678 }
2679
2680 static void nfs4_kill_super(struct super_block *sb)
2681 {
2682 struct nfs_server *server = NFS_SB(sb);
2683
2684 dprintk("--> %s\n", __func__);
2685 nfs_super_return_all_delegations(sb);
2686 kill_anon_super(sb);
2687 nfs4_renewd_prepare_shutdown(server);
2688 nfs_fscache_release_super_cookie(sb);
2689 nfs_free_server(server);
2690 dprintk("<-- %s\n", __func__);
2691 }
2692
2693 /*
2694 * Clone an NFS4 server record on xdev traversal (FSID-change)
2695 */
2696 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2697 const char *dev_name, void *raw_data,
2698 struct vfsmount *mnt)
2699 {
2700 struct nfs_clone_mount *data = raw_data;
2701 struct super_block *s;
2702 struct nfs_server *server;
2703 struct dentry *mntroot;
2704 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2705 struct nfs_sb_mountdata sb_mntdata = {
2706 .mntflags = flags,
2707 };
2708 int error;
2709
2710 dprintk("--> nfs4_xdev_get_sb()\n");
2711
2712 /* create a new volume representation */
2713 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2714 if (IS_ERR(server)) {
2715 error = PTR_ERR(server);
2716 goto out_err_noserver;
2717 }
2718 sb_mntdata.server = server;
2719
2720 if (server->flags & NFS4_MOUNT_UNSHARED)
2721 compare_super = NULL;
2722
2723 /* Get a superblock - note that we may end up sharing one that already exists */
2724 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2725 if (IS_ERR(s)) {
2726 error = PTR_ERR(s);
2727 goto out_err_nosb;
2728 }
2729
2730 if (s->s_fs_info != server) {
2731 nfs_free_server(server);
2732 server = NULL;
2733 } else {
2734 error = nfs_bdi_register(server);
2735 if (error)
2736 goto error_splat_super;
2737 }
2738
2739 if (!s->s_root) {
2740 /* initial superblock/root creation */
2741 nfs4_clone_super(s, data->sb);
2742 }
2743
2744 mntroot = nfs4_get_root(s, data->fh);
2745 if (IS_ERR(mntroot)) {
2746 error = PTR_ERR(mntroot);
2747 goto error_splat_super;
2748 }
2749 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2750 dput(mntroot);
2751 error = -ESTALE;
2752 goto error_splat_super;
2753 }
2754
2755 s->s_flags |= MS_ACTIVE;
2756 mnt->mnt_sb = s;
2757 mnt->mnt_root = mntroot;
2758
2759 security_sb_clone_mnt_opts(data->sb, s);
2760
2761 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2762 return 0;
2763
2764 out_err_nosb:
2765 nfs_free_server(server);
2766 out_err_noserver:
2767 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2768 return error;
2769
2770 error_splat_super:
2771 deactivate_locked_super(s);
2772 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2773 return error;
2774 }
2775
2776 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2777 int flags, const char *dev_name, void *raw_data,
2778 struct vfsmount *mnt)
2779 {
2780 struct nfs_clone_mount *data = raw_data;
2781 struct super_block *s;
2782 struct nfs_server *server;
2783 struct dentry *mntroot;
2784 struct nfs_fh mntfh;
2785 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2786 struct nfs_sb_mountdata sb_mntdata = {
2787 .mntflags = flags,
2788 };
2789 int error;
2790
2791 dprintk("--> nfs4_referral_get_sb()\n");
2792
2793 /* create a new volume representation */
2794 server = nfs4_create_referral_server(data, &mntfh);
2795 if (IS_ERR(server)) {
2796 error = PTR_ERR(server);
2797 goto out_err_noserver;
2798 }
2799 sb_mntdata.server = server;
2800
2801 if (server->flags & NFS4_MOUNT_UNSHARED)
2802 compare_super = NULL;
2803
2804 /* Get a superblock - note that we may end up sharing one that already exists */
2805 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2806 if (IS_ERR(s)) {
2807 error = PTR_ERR(s);
2808 goto out_err_nosb;
2809 }
2810
2811 if (s->s_fs_info != server) {
2812 nfs_free_server(server);
2813 server = NULL;
2814 } else {
2815 error = nfs_bdi_register(server);
2816 if (error)
2817 goto error_splat_super;
2818 }
2819
2820 if (!s->s_root) {
2821 /* initial superblock/root creation */
2822 nfs4_fill_super(s);
2823 }
2824
2825 mntroot = nfs4_get_root(s, &mntfh);
2826 if (IS_ERR(mntroot)) {
2827 error = PTR_ERR(mntroot);
2828 goto error_splat_super;
2829 }
2830 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2831 dput(mntroot);
2832 error = -ESTALE;
2833 goto error_splat_super;
2834 }
2835
2836 s->s_flags |= MS_ACTIVE;
2837 mnt->mnt_sb = s;
2838 mnt->mnt_root = mntroot;
2839
2840 security_sb_clone_mnt_opts(data->sb, s);
2841
2842 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2843 return 0;
2844
2845 out_err_nosb:
2846 nfs_free_server(server);
2847 out_err_noserver:
2848 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2849 return error;
2850
2851 error_splat_super:
2852 deactivate_locked_super(s);
2853 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2854 return error;
2855 }
2856
2857 /*
2858 * Create an NFS4 server record on referral traversal
2859 */
2860 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2861 int flags, const char *dev_name, void *raw_data,
2862 struct vfsmount *mnt)
2863 {
2864 struct nfs_clone_mount *data = raw_data;
2865 char *export_path;
2866 struct vfsmount *root_mnt;
2867 int error;
2868
2869 dprintk("--> nfs4_referral_get_sb()\n");
2870
2871 export_path = data->mnt_path;
2872 data->mnt_path = "/";
2873
2874 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2875 flags, data, data->hostname);
2876 data->mnt_path = export_path;
2877
2878 error = PTR_ERR(root_mnt);
2879 if (IS_ERR(root_mnt))
2880 goto out;
2881
2882 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2883 out:
2884 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2885 error != 0 ? " [error]" : "");
2886 return error;
2887 }
2888
2889 #endif /* CONFIG_NFS_V4 */
Support for the Chinese Samsung S3C2440 based development boards