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MN10300: Fix flush_icache_range()
[linux-rapidio-2.6.git] / fs / nfs / super.c
blobf4cbf0c306c64d6583cbfffaa14cfbc7a467dfaa
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 <linux/slab.h>
52 #include <net/ipv6.h>
53 #include <linux/netdevice.h>
54 #include <linux/nfs_xdr.h>
55 #include <linux/magic.h>
56 #include <linux/parser.h>
57
58 #include <asm/system.h>
59 #include <asm/uaccess.h>
60
61 #include "nfs4_fs.h"
62 #include "callback.h"
63 #include "delegation.h"
64 #include "iostat.h"
65 #include "internal.h"
66 #include "fscache.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 enum {
71 /* Mount options that take no arguments */
72 Opt_soft, Opt_hard,
73 Opt_posix, Opt_noposix,
74 Opt_cto, Opt_nocto,
75 Opt_ac, Opt_noac,
76 Opt_lock, Opt_nolock,
77 Opt_v2, Opt_v3, Opt_v4,
78 Opt_udp, Opt_tcp, Opt_rdma,
79 Opt_acl, Opt_noacl,
80 Opt_rdirplus, Opt_nordirplus,
81 Opt_sharecache, Opt_nosharecache,
82 Opt_resvport, Opt_noresvport,
83 Opt_fscache, Opt_nofscache,
84
85 /* Mount options that take integer arguments */
86 Opt_port,
87 Opt_rsize, Opt_wsize, Opt_bsize,
88 Opt_timeo, Opt_retrans,
89 Opt_acregmin, Opt_acregmax,
90 Opt_acdirmin, Opt_acdirmax,
91 Opt_actimeo,
92 Opt_namelen,
93 Opt_mountport,
94 Opt_mountvers,
95 Opt_nfsvers,
96 Opt_minorversion,
97
98 /* Mount options that take string arguments */
99 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
100 Opt_addr, Opt_mountaddr, Opt_clientaddr,
101 Opt_lookupcache,
102 Opt_fscache_uniq,
103
104 /* Special mount options */
105 Opt_userspace, Opt_deprecated, Opt_sloppy,
106
107 Opt_err
108 };
109
110 static const match_table_t nfs_mount_option_tokens = {
111 { Opt_userspace, "bg" },
112 { Opt_userspace, "fg" },
113 { Opt_userspace, "retry=%s" },
114
115 { Opt_sloppy, "sloppy" },
116
117 { Opt_soft, "soft" },
118 { Opt_hard, "hard" },
119 { Opt_deprecated, "intr" },
120 { Opt_deprecated, "nointr" },
121 { Opt_posix, "posix" },
122 { Opt_noposix, "noposix" },
123 { Opt_cto, "cto" },
124 { Opt_nocto, "nocto" },
125 { Opt_ac, "ac" },
126 { Opt_noac, "noac" },
127 { Opt_lock, "lock" },
128 { Opt_nolock, "nolock" },
129 { Opt_v2, "v2" },
130 { Opt_v3, "v3" },
131 { Opt_v4, "v4" },
132 { Opt_udp, "udp" },
133 { Opt_tcp, "tcp" },
134 { Opt_rdma, "rdma" },
135 { Opt_acl, "acl" },
136 { Opt_noacl, "noacl" },
137 { Opt_rdirplus, "rdirplus" },
138 { Opt_nordirplus, "nordirplus" },
139 { Opt_sharecache, "sharecache" },
140 { Opt_nosharecache, "nosharecache" },
141 { Opt_resvport, "resvport" },
142 { Opt_noresvport, "noresvport" },
143 { Opt_fscache, "fsc" },
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 { Opt_fscache_uniq, "fsc=%s" },
174
175 { Opt_err, NULL }
176 };
177
178 enum {
179 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
180
181 Opt_xprt_err
182 };
183
184 static const match_table_t nfs_xprt_protocol_tokens = {
185 { Opt_xprt_udp, "udp" },
186 { Opt_xprt_udp6, "udp6" },
187 { Opt_xprt_tcp, "tcp" },
188 { Opt_xprt_tcp6, "tcp6" },
189 { Opt_xprt_rdma, "rdma" },
190
191 { Opt_xprt_err, NULL }
192 };
193
194 enum {
195 Opt_sec_none, Opt_sec_sys,
196 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
197 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
198 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
199
200 Opt_sec_err
201 };
202
203 static const match_table_t nfs_secflavor_tokens = {
204 { Opt_sec_none, "none" },
205 { Opt_sec_none, "null" },
206 { Opt_sec_sys, "sys" },
207
208 { Opt_sec_krb5, "krb5" },
209 { Opt_sec_krb5i, "krb5i" },
210 { Opt_sec_krb5p, "krb5p" },
211
212 { Opt_sec_lkey, "lkey" },
213 { Opt_sec_lkeyi, "lkeyi" },
214 { Opt_sec_lkeyp, "lkeyp" },
215
216 { Opt_sec_spkm, "spkm3" },
217 { Opt_sec_spkmi, "spkm3i" },
218 { Opt_sec_spkmp, "spkm3p" },
219
220 { Opt_sec_err, NULL }
221 };
222
223 enum {
224 Opt_lookupcache_all, Opt_lookupcache_positive,
225 Opt_lookupcache_none,
226
227 Opt_lookupcache_err
228 };
229
230 static match_table_t nfs_lookupcache_tokens = {
231 { Opt_lookupcache_all, "all" },
232 { Opt_lookupcache_positive, "pos" },
233 { Opt_lookupcache_positive, "positive" },
234 { Opt_lookupcache_none, "none" },
235
236 { Opt_lookupcache_err, NULL }
237 };
238
239
240 static void nfs_umount_begin(struct super_block *);
241 static int nfs_statfs(struct dentry *, struct kstatfs *);
242 static int nfs_show_options(struct seq_file *, struct vfsmount *);
243 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
244 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
245 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
247 static void nfs_put_super(struct super_block *);
248 static void nfs_kill_super(struct super_block *);
249 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
250
251 static struct file_system_type nfs_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs",
254 .get_sb = nfs_get_sb,
255 .kill_sb = nfs_kill_super,
256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
257 };
258
259 struct file_system_type nfs_xdev_fs_type = {
260 .owner = THIS_MODULE,
261 .name = "nfs",
262 .get_sb = nfs_xdev_get_sb,
263 .kill_sb = nfs_kill_super,
264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
265 };
266
267 static const struct super_operations nfs_sops = {
268 .alloc_inode = nfs_alloc_inode,
269 .destroy_inode = nfs_destroy_inode,
270 .write_inode = nfs_write_inode,
271 .put_super = nfs_put_super,
272 .statfs = nfs_statfs,
273 .evict_inode = nfs_evict_inode,
274 .umount_begin = nfs_umount_begin,
275 .show_options = nfs_show_options,
276 .show_stats = nfs_show_stats,
277 .remount_fs = nfs_remount,
278 };
279
280 #ifdef CONFIG_NFS_V4
281 static int nfs4_validate_text_mount_data(void *options,
282 struct nfs_parsed_mount_data *args, const char *dev_name);
283 static int nfs4_try_mount(int flags, const char *dev_name,
284 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
285 static int nfs4_get_sb(struct file_system_type *fs_type,
286 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
287 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
288 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
289 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
290 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
291 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
292 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
293 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
294 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
295 static void nfs4_kill_super(struct super_block *sb);
296
297 static struct file_system_type nfs4_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs4",
300 .get_sb = nfs4_get_sb,
301 .kill_sb = nfs4_kill_super,
302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
303 };
304
305 static struct file_system_type nfs4_remote_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs4",
308 .get_sb = nfs4_remote_get_sb,
309 .kill_sb = nfs4_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311 };
312
313 struct file_system_type nfs4_xdev_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "nfs4",
316 .get_sb = nfs4_xdev_get_sb,
317 .kill_sb = nfs4_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319 };
320
321 static struct file_system_type nfs4_remote_referral_fs_type = {
322 .owner = THIS_MODULE,
323 .name = "nfs4",
324 .get_sb = nfs4_remote_referral_get_sb,
325 .kill_sb = nfs4_kill_super,
326 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
327 };
328
329 struct file_system_type nfs4_referral_fs_type = {
330 .owner = THIS_MODULE,
331 .name = "nfs4",
332 .get_sb = nfs4_referral_get_sb,
333 .kill_sb = nfs4_kill_super,
334 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
335 };
336
337 static const struct super_operations nfs4_sops = {
338 .alloc_inode = nfs_alloc_inode,
339 .destroy_inode = nfs_destroy_inode,
340 .write_inode = nfs_write_inode,
341 .put_super = nfs_put_super,
342 .statfs = nfs_statfs,
343 .evict_inode = nfs4_evict_inode,
344 .umount_begin = nfs_umount_begin,
345 .show_options = nfs_show_options,
346 .show_stats = nfs_show_stats,
347 .remount_fs = nfs_remount,
348 };
349 #endif
350
351 static struct shrinker acl_shrinker = {
352 .shrink = nfs_access_cache_shrinker,
353 .seeks = DEFAULT_SEEKS,
354 };
355
356 /*
357 * Register the NFS filesystems
358 */
359 int __init register_nfs_fs(void)
360 {
361 int ret;
362
363 ret = register_filesystem(&nfs_fs_type);
364 if (ret < 0)
365 goto error_0;
366
367 ret = nfs_register_sysctl();
368 if (ret < 0)
369 goto error_1;
370 #ifdef CONFIG_NFS_V4
371 ret = register_filesystem(&nfs4_fs_type);
372 if (ret < 0)
373 goto error_2;
374 #endif
375 register_shrinker(&acl_shrinker);
376 return 0;
377
378 #ifdef CONFIG_NFS_V4
379 error_2:
380 nfs_unregister_sysctl();
381 #endif
382 error_1:
383 unregister_filesystem(&nfs_fs_type);
384 error_0:
385 return ret;
386 }
387
388 /*
389 * Unregister the NFS filesystems
390 */
391 void __exit unregister_nfs_fs(void)
392 {
393 unregister_shrinker(&acl_shrinker);
394 #ifdef CONFIG_NFS_V4
395 unregister_filesystem(&nfs4_fs_type);
396 #endif
397 nfs_unregister_sysctl();
398 unregister_filesystem(&nfs_fs_type);
399 }
400
401 void nfs_sb_active(struct super_block *sb)
402 {
403 struct nfs_server *server = NFS_SB(sb);
404
405 if (atomic_inc_return(&server->active) == 1)
406 atomic_inc(&sb->s_active);
407 }
408
409 void nfs_sb_deactive(struct super_block *sb)
410 {
411 struct nfs_server *server = NFS_SB(sb);
412
413 if (atomic_dec_and_test(&server->active))
414 deactivate_super(sb);
415 }
416
417 /*
418 * Deliver file system statistics to userspace
419 */
420 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
421 {
422 struct nfs_server *server = NFS_SB(dentry->d_sb);
423 unsigned char blockbits;
424 unsigned long blockres;
425 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
426 struct nfs_fsstat res;
427 int error = -ENOMEM;
428
429 res.fattr = nfs_alloc_fattr();
430 if (res.fattr == NULL)
431 goto out_err;
432
433 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
434 if (unlikely(error == -ESTALE)) {
435 struct dentry *pd_dentry;
436
437 pd_dentry = dget_parent(dentry);
438 if (pd_dentry != NULL) {
439 nfs_zap_caches(pd_dentry->d_inode);
440 dput(pd_dentry);
441 }
442 }
443 nfs_free_fattr(res.fattr);
444 if (error < 0)
445 goto out_err;
446
447 buf->f_type = NFS_SUPER_MAGIC;
448
449 /*
450 * Current versions of glibc do not correctly handle the
451 * case where f_frsize != f_bsize. Eventually we want to
452 * report the value of wtmult in this field.
453 */
454 buf->f_frsize = dentry->d_sb->s_blocksize;
455
456 /*
457 * On most *nix systems, f_blocks, f_bfree, and f_bavail
458 * are reported in units of f_frsize. Linux hasn't had
459 * an f_frsize field in its statfs struct until recently,
460 * thus historically Linux's sys_statfs reports these
461 * fields in units of f_bsize.
462 */
463 buf->f_bsize = dentry->d_sb->s_blocksize;
464 blockbits = dentry->d_sb->s_blocksize_bits;
465 blockres = (1 << blockbits) - 1;
466 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
467 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
468 buf->f_bavail = (res.abytes + blockres) >> blockbits;
469
470 buf->f_files = res.tfiles;
471 buf->f_ffree = res.afiles;
472
473 buf->f_namelen = server->namelen;
474
475 return 0;
476
477 out_err:
478 dprintk("%s: statfs error = %d\n", __func__, -error);
479 return error;
480 }
481
482 /*
483 * Map the security flavour number to a name
484 */
485 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
486 {
487 static const struct {
488 rpc_authflavor_t flavour;
489 const char *str;
490 } sec_flavours[] = {
491 { RPC_AUTH_NULL, "null" },
492 { RPC_AUTH_UNIX, "sys" },
493 { RPC_AUTH_GSS_KRB5, "krb5" },
494 { RPC_AUTH_GSS_KRB5I, "krb5i" },
495 { RPC_AUTH_GSS_KRB5P, "krb5p" },
496 { RPC_AUTH_GSS_LKEY, "lkey" },
497 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
498 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
499 { RPC_AUTH_GSS_SPKM, "spkm" },
500 { RPC_AUTH_GSS_SPKMI, "spkmi" },
501 { RPC_AUTH_GSS_SPKMP, "spkmp" },
502 { UINT_MAX, "unknown" }
503 };
504 int i;
505
506 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
507 if (sec_flavours[i].flavour == flavour)
508 break;
509 }
510 return sec_flavours[i].str;
511 }
512
513 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
514 int showdefaults)
515 {
516 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
517
518 seq_printf(m, ",mountproto=");
519 switch (sap->sa_family) {
520 case AF_INET:
521 switch (nfss->mountd_protocol) {
522 case IPPROTO_UDP:
523 seq_printf(m, RPCBIND_NETID_UDP);
524 break;
525 case IPPROTO_TCP:
526 seq_printf(m, RPCBIND_NETID_TCP);
527 break;
528 default:
529 if (showdefaults)
530 seq_printf(m, "auto");
531 }
532 break;
533 case AF_INET6:
534 switch (nfss->mountd_protocol) {
535 case IPPROTO_UDP:
536 seq_printf(m, RPCBIND_NETID_UDP6);
537 break;
538 case IPPROTO_TCP:
539 seq_printf(m, RPCBIND_NETID_TCP6);
540 break;
541 default:
542 if (showdefaults)
543 seq_printf(m, "auto");
544 }
545 break;
546 default:
547 if (showdefaults)
548 seq_printf(m, "auto");
549 }
550 }
551
552 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
553 int showdefaults)
554 {
555 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
556
557 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
558 return;
559
560 switch (sap->sa_family) {
561 case AF_INET: {
562 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
563 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
564 break;
565 }
566 case AF_INET6: {
567 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
568 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
569 break;
570 }
571 default:
572 if (showdefaults)
573 seq_printf(m, ",mountaddr=unspecified");
574 }
575
576 if (nfss->mountd_version || showdefaults)
577 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
578 if (nfss->mountd_port || showdefaults)
579 seq_printf(m, ",mountport=%u", nfss->mountd_port);
580
581 nfs_show_mountd_netid(m, nfss, showdefaults);
582 }
583
584 #ifdef CONFIG_NFS_V4
585 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
586 int showdefaults)
587 {
588 struct nfs_client *clp = nfss->nfs_client;
589
590 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
591 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
592 }
593 #else
594 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
595 int showdefaults)
596 {
597 }
598 #endif
599
600 /*
601 * Describe the mount options in force on this server representation
602 */
603 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605 {
606 static const struct proc_nfs_info {
607 int flag;
608 const char *str;
609 const char *nostr;
610 } nfs_info[] = {
611 { NFS_MOUNT_SOFT, ",soft", ",hard" },
612 { NFS_MOUNT_POSIX, ",posix", "" },
613 { NFS_MOUNT_NOCTO, ",nocto", "" },
614 { NFS_MOUNT_NOAC, ",noac", "" },
615 { NFS_MOUNT_NONLM, ",nolock", "" },
616 { NFS_MOUNT_NOACL, ",noacl", "" },
617 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
618 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
619 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
620 { 0, NULL, NULL }
621 };
622 const struct proc_nfs_info *nfs_infop;
623 struct nfs_client *clp = nfss->nfs_client;
624 u32 version = clp->rpc_ops->version;
625
626 seq_printf(m, ",vers=%u", version);
627 seq_printf(m, ",rsize=%u", nfss->rsize);
628 seq_printf(m, ",wsize=%u", nfss->wsize);
629 if (nfss->bsize != 0)
630 seq_printf(m, ",bsize=%u", nfss->bsize);
631 seq_printf(m, ",namlen=%u", nfss->namelen);
632 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
633 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
634 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
635 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
636 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
637 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
638 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
639 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
640 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
641 if (nfss->flags & nfs_infop->flag)
642 seq_puts(m, nfs_infop->str);
643 else
644 seq_puts(m, nfs_infop->nostr);
645 }
646 seq_printf(m, ",proto=%s",
647 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
648 if (version == 4) {
649 if (nfss->port != NFS_PORT)
650 seq_printf(m, ",port=%u", nfss->port);
651 } else
652 if (nfss->port)
653 seq_printf(m, ",port=%u", nfss->port);
654
655 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
656 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
657 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
658
659 if (version != 4)
660 nfs_show_mountd_options(m, nfss, showdefaults);
661 else
662 nfs_show_nfsv4_options(m, nfss, showdefaults);
663
664 if (nfss->options & NFS_OPTION_FSCACHE)
665 seq_printf(m, ",fsc");
666
667 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
668 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
669 seq_printf(m, ",lookupcache=none");
670 else
671 seq_printf(m, ",lookupcache=pos");
672 }
673 }
674
675 /*
676 * Describe the mount options on this VFS mountpoint
677 */
678 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
679 {
680 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
681
682 nfs_show_mount_options(m, nfss, 0);
683
684 seq_printf(m, ",addr=%s",
685 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
686 RPC_DISPLAY_ADDR));
687
688 return 0;
689 }
690
691 /*
692 * Present statistical information for this VFS mountpoint
693 */
694 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
695 {
696 int i, cpu;
697 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
698 struct rpc_auth *auth = nfss->client->cl_auth;
699 struct nfs_iostats totals = { };
700
701 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
702
703 /*
704 * Display all mount option settings
705 */
706 seq_printf(m, "\n\topts:\t");
707 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
708 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
709 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
710 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
711 nfs_show_mount_options(m, nfss, 1);
712
713 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
714
715 seq_printf(m, "\n\tcaps:\t");
716 seq_printf(m, "caps=0x%x", nfss->caps);
717 seq_printf(m, ",wtmult=%u", nfss->wtmult);
718 seq_printf(m, ",dtsize=%u", nfss->dtsize);
719 seq_printf(m, ",bsize=%u", nfss->bsize);
720 seq_printf(m, ",namlen=%u", nfss->namelen);
721
722 #ifdef CONFIG_NFS_V4
723 if (nfss->nfs_client->rpc_ops->version == 4) {
724 seq_printf(m, "\n\tnfsv4:\t");
725 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
726 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
727 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
728 }
729 #endif
730
731 /*
732 * Display security flavor in effect for this mount
733 */
734 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
735 if (auth->au_flavor)
736 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
737
738 /*
739 * Display superblock I/O counters
740 */
741 for_each_possible_cpu(cpu) {
742 struct nfs_iostats *stats;
743
744 preempt_disable();
745 stats = per_cpu_ptr(nfss->io_stats, cpu);
746
747 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
748 totals.events[i] += stats->events[i];
749 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
750 totals.bytes[i] += stats->bytes[i];
751 #ifdef CONFIG_NFS_FSCACHE
752 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
753 totals.fscache[i] += stats->fscache[i];
754 #endif
755
756 preempt_enable();
757 }
758
759 seq_printf(m, "\n\tevents:\t");
760 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
761 seq_printf(m, "%lu ", totals.events[i]);
762 seq_printf(m, "\n\tbytes:\t");
763 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
764 seq_printf(m, "%Lu ", totals.bytes[i]);
765 #ifdef CONFIG_NFS_FSCACHE
766 if (nfss->options & NFS_OPTION_FSCACHE) {
767 seq_printf(m, "\n\tfsc:\t");
768 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
769 seq_printf(m, "%Lu ", totals.bytes[i]);
770 }
771 #endif
772 seq_printf(m, "\n");
773
774 rpc_print_iostats(m, nfss->client);
775
776 return 0;
777 }
778
779 /*
780 * Begin unmount by attempting to remove all automounted mountpoints we added
781 * in response to xdev traversals and referrals
782 */
783 static void nfs_umount_begin(struct super_block *sb)
784 {
785 struct nfs_server *server;
786 struct rpc_clnt *rpc;
787
788 server = NFS_SB(sb);
789 /* -EIO all pending I/O */
790 rpc = server->client_acl;
791 if (!IS_ERR(rpc))
792 rpc_killall_tasks(rpc);
793 rpc = server->client;
794 if (!IS_ERR(rpc))
795 rpc_killall_tasks(rpc);
796 }
797
798 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
799 {
800 struct nfs_parsed_mount_data *data;
801
802 data = kzalloc(sizeof(*data), GFP_KERNEL);
803 if (data) {
804 data->acregmin = NFS_DEF_ACREGMIN;
805 data->acregmax = NFS_DEF_ACREGMAX;
806 data->acdirmin = NFS_DEF_ACDIRMIN;
807 data->acdirmax = NFS_DEF_ACDIRMAX;
808 data->mount_server.port = NFS_UNSPEC_PORT;
809 data->nfs_server.port = NFS_UNSPEC_PORT;
810 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
811 data->auth_flavors[0] = RPC_AUTH_UNIX;
812 data->auth_flavor_len = 1;
813 data->version = version;
814 data->minorversion = 0;
815 }
816 return data;
817 }
818
819 /*
820 * Sanity-check a server address provided by the mount command.
821 *
822 * Address family must be initialized, and address must not be
823 * the ANY address for that family.
824 */
825 static int nfs_verify_server_address(struct sockaddr *addr)
826 {
827 switch (addr->sa_family) {
828 case AF_INET: {
829 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
830 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
831 }
832 case AF_INET6: {
833 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
834 return !ipv6_addr_any(sa);
835 }
836 }
837
838 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
839 return 0;
840 }
841
842 /*
843 * Select between a default port value and a user-specified port value.
844 * If a zero value is set, then autobind will be used.
845 */
846 static void nfs_set_port(struct sockaddr *sap, int *port,
847 const unsigned short default_port)
848 {
849 if (*port == NFS_UNSPEC_PORT)
850 *port = default_port;
851
852 rpc_set_port(sap, *port);
853 }
854
855 /*
856 * Sanity check the NFS transport protocol.
857 *
858 */
859 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
860 {
861 switch (mnt->nfs_server.protocol) {
862 case XPRT_TRANSPORT_UDP:
863 case XPRT_TRANSPORT_TCP:
864 case XPRT_TRANSPORT_RDMA:
865 break;
866 default:
867 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
868 }
869 }
870
871 /*
872 * For text based NFSv2/v3 mounts, the mount protocol transport default
873 * settings should depend upon the specified NFS transport.
874 */
875 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
876 {
877 nfs_validate_transport_protocol(mnt);
878
879 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
880 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
881 return;
882 switch (mnt->nfs_server.protocol) {
883 case XPRT_TRANSPORT_UDP:
884 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
885 break;
886 case XPRT_TRANSPORT_TCP:
887 case XPRT_TRANSPORT_RDMA:
888 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
889 }
890 }
891
892 /*
893 * Parse the value of the 'sec=' option.
894 */
895 static int nfs_parse_security_flavors(char *value,
896 struct nfs_parsed_mount_data *mnt)
897 {
898 substring_t args[MAX_OPT_ARGS];
899
900 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
901
902 switch (match_token(value, nfs_secflavor_tokens, args)) {
903 case Opt_sec_none:
904 mnt->auth_flavors[0] = RPC_AUTH_NULL;
905 break;
906 case Opt_sec_sys:
907 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
908 break;
909 case Opt_sec_krb5:
910 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
911 break;
912 case Opt_sec_krb5i:
913 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
914 break;
915 case Opt_sec_krb5p:
916 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
917 break;
918 case Opt_sec_lkey:
919 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
920 break;
921 case Opt_sec_lkeyi:
922 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
923 break;
924 case Opt_sec_lkeyp:
925 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
926 break;
927 case Opt_sec_spkm:
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
929 break;
930 case Opt_sec_spkmi:
931 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
932 break;
933 case Opt_sec_spkmp:
934 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
935 break;
936 default:
937 return 0;
938 }
939
940 mnt->auth_flavor_len = 1;
941 return 1;
942 }
943
944 /*
945 * Error-check and convert a string of mount options from user space into
946 * a data structure. The whole mount string is processed; bad options are
947 * skipped as they are encountered. If there were no errors, return 1;
948 * otherwise return 0 (zero).
949 */
950 static int nfs_parse_mount_options(char *raw,
951 struct nfs_parsed_mount_data *mnt)
952 {
953 char *p, *string, *secdata;
954 int rc, sloppy = 0, invalid_option = 0;
955 unsigned short protofamily = AF_UNSPEC;
956 unsigned short mountfamily = AF_UNSPEC;
957
958 if (!raw) {
959 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
960 return 1;
961 }
962 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
963
964 secdata = alloc_secdata();
965 if (!secdata)
966 goto out_nomem;
967
968 rc = security_sb_copy_data(raw, secdata);
969 if (rc)
970 goto out_security_failure;
971
972 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
973 if (rc)
974 goto out_security_failure;
975
976 free_secdata(secdata);
977
978 while ((p = strsep(&raw, ",")) != NULL) {
979 substring_t args[MAX_OPT_ARGS];
980 unsigned long option;
981 int token;
982
983 if (!*p)
984 continue;
985
986 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
987
988 token = match_token(p, nfs_mount_option_tokens, args);
989 switch (token) {
990
991 /*
992 * boolean options: foo/nofoo
993 */
994 case Opt_soft:
995 mnt->flags |= NFS_MOUNT_SOFT;
996 break;
997 case Opt_hard:
998 mnt->flags &= ~NFS_MOUNT_SOFT;
999 break;
1000 case Opt_posix:
1001 mnt->flags |= NFS_MOUNT_POSIX;
1002 break;
1003 case Opt_noposix:
1004 mnt->flags &= ~NFS_MOUNT_POSIX;
1005 break;
1006 case Opt_cto:
1007 mnt->flags &= ~NFS_MOUNT_NOCTO;
1008 break;
1009 case Opt_nocto:
1010 mnt->flags |= NFS_MOUNT_NOCTO;
1011 break;
1012 case Opt_ac:
1013 mnt->flags &= ~NFS_MOUNT_NOAC;
1014 break;
1015 case Opt_noac:
1016 mnt->flags |= NFS_MOUNT_NOAC;
1017 break;
1018 case Opt_lock:
1019 mnt->flags &= ~NFS_MOUNT_NONLM;
1020 break;
1021 case Opt_nolock:
1022 mnt->flags |= NFS_MOUNT_NONLM;
1023 break;
1024 case Opt_v2:
1025 mnt->flags &= ~NFS_MOUNT_VER3;
1026 mnt->version = 2;
1027 break;
1028 case Opt_v3:
1029 mnt->flags |= NFS_MOUNT_VER3;
1030 mnt->version = 3;
1031 break;
1032 #ifdef CONFIG_NFS_V4
1033 case Opt_v4:
1034 mnt->flags &= ~NFS_MOUNT_VER3;
1035 mnt->version = 4;
1036 break;
1037 #endif
1038 case Opt_udp:
1039 mnt->flags &= ~NFS_MOUNT_TCP;
1040 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1041 break;
1042 case Opt_tcp:
1043 mnt->flags |= NFS_MOUNT_TCP;
1044 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1045 break;
1046 case Opt_rdma:
1047 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1048 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1049 xprt_load_transport(p);
1050 break;
1051 case Opt_acl:
1052 mnt->flags &= ~NFS_MOUNT_NOACL;
1053 break;
1054 case Opt_noacl:
1055 mnt->flags |= NFS_MOUNT_NOACL;
1056 break;
1057 case Opt_rdirplus:
1058 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1059 break;
1060 case Opt_nordirplus:
1061 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1062 break;
1063 case Opt_sharecache:
1064 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1065 break;
1066 case Opt_nosharecache:
1067 mnt->flags |= NFS_MOUNT_UNSHARED;
1068 break;
1069 case Opt_resvport:
1070 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1071 break;
1072 case Opt_noresvport:
1073 mnt->flags |= NFS_MOUNT_NORESVPORT;
1074 break;
1075 case Opt_fscache:
1076 mnt->options |= NFS_OPTION_FSCACHE;
1077 kfree(mnt->fscache_uniq);
1078 mnt->fscache_uniq = NULL;
1079 break;
1080 case Opt_nofscache:
1081 mnt->options &= ~NFS_OPTION_FSCACHE;
1082 kfree(mnt->fscache_uniq);
1083 mnt->fscache_uniq = NULL;
1084 break;
1085
1086 /*
1087 * options that take numeric values
1088 */
1089 case Opt_port:
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 || option > USHRT_MAX)
1096 goto out_invalid_value;
1097 mnt->nfs_server.port = option;
1098 break;
1099 case Opt_rsize:
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->rsize = option;
1108 break;
1109 case Opt_wsize:
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->wsize = option;
1118 break;
1119 case Opt_bsize:
1120 string = match_strdup(args);
1121 if (string == NULL)
1122 goto out_nomem;
1123 rc = strict_strtoul(string, 10, &option);
1124 kfree(string);
1125 if (rc != 0)
1126 goto out_invalid_value;
1127 mnt->bsize = option;
1128 break;
1129 case Opt_timeo:
1130 string = match_strdup(args);
1131 if (string == NULL)
1132 goto out_nomem;
1133 rc = strict_strtoul(string, 10, &option);
1134 kfree(string);
1135 if (rc != 0 || option == 0)
1136 goto out_invalid_value;
1137 mnt->timeo = option;
1138 break;
1139 case Opt_retrans:
1140 string = match_strdup(args);
1141 if (string == NULL)
1142 goto out_nomem;
1143 rc = strict_strtoul(string, 10, &option);
1144 kfree(string);
1145 if (rc != 0 || option == 0)
1146 goto out_invalid_value;
1147 mnt->retrans = option;
1148 break;
1149 case Opt_acregmin:
1150 string = match_strdup(args);
1151 if (string == NULL)
1152 goto out_nomem;
1153 rc = strict_strtoul(string, 10, &option);
1154 kfree(string);
1155 if (rc != 0)
1156 goto out_invalid_value;
1157 mnt->acregmin = option;
1158 break;
1159 case Opt_acregmax:
1160 string = match_strdup(args);
1161 if (string == NULL)
1162 goto out_nomem;
1163 rc = strict_strtoul(string, 10, &option);
1164 kfree(string);
1165 if (rc != 0)
1166 goto out_invalid_value;
1167 mnt->acregmax = option;
1168 break;
1169 case Opt_acdirmin:
1170 string = match_strdup(args);
1171 if (string == NULL)
1172 goto out_nomem;
1173 rc = strict_strtoul(string, 10, &option);
1174 kfree(string);
1175 if (rc != 0)
1176 goto out_invalid_value;
1177 mnt->acdirmin = option;
1178 break;
1179 case Opt_acdirmax:
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 mnt->acdirmax = option;
1188 break;
1189 case Opt_actimeo:
1190 string = match_strdup(args);
1191 if (string == NULL)
1192 goto out_nomem;
1193 rc = strict_strtoul(string, 10, &option);
1194 kfree(string);
1195 if (rc != 0)
1196 goto out_invalid_value;
1197 mnt->acregmin = mnt->acregmax =
1198 mnt->acdirmin = mnt->acdirmax = option;
1199 break;
1200 case Opt_namelen:
1201 string = match_strdup(args);
1202 if (string == NULL)
1203 goto out_nomem;
1204 rc = strict_strtoul(string, 10, &option);
1205 kfree(string);
1206 if (rc != 0)
1207 goto out_invalid_value;
1208 mnt->namlen = option;
1209 break;
1210 case Opt_mountport:
1211 string = match_strdup(args);
1212 if (string == NULL)
1213 goto out_nomem;
1214 rc = strict_strtoul(string, 10, &option);
1215 kfree(string);
1216 if (rc != 0 || option > USHRT_MAX)
1217 goto out_invalid_value;
1218 mnt->mount_server.port = option;
1219 break;
1220 case Opt_mountvers:
1221 string = match_strdup(args);
1222 if (string == NULL)
1223 goto out_nomem;
1224 rc = strict_strtoul(string, 10, &option);
1225 kfree(string);
1226 if (rc != 0 ||
1227 option < NFS_MNT_VERSION ||
1228 option > NFS_MNT3_VERSION)
1229 goto out_invalid_value;
1230 mnt->mount_server.version = option;
1231 break;
1232 case Opt_nfsvers:
1233 string = match_strdup(args);
1234 if (string == NULL)
1235 goto out_nomem;
1236 rc = strict_strtoul(string, 10, &option);
1237 kfree(string);
1238 if (rc != 0)
1239 goto out_invalid_value;
1240 switch (option) {
1241 case NFS2_VERSION:
1242 mnt->flags &= ~NFS_MOUNT_VER3;
1243 mnt->version = 2;
1244 break;
1245 case NFS3_VERSION:
1246 mnt->flags |= NFS_MOUNT_VER3;
1247 mnt->version = 3;
1248 break;
1249 #ifdef CONFIG_NFS_V4
1250 case NFS4_VERSION:
1251 mnt->flags &= ~NFS_MOUNT_VER3;
1252 mnt->version = 4;
1253 break;
1254 #endif
1255 default:
1256 goto out_invalid_value;
1257 }
1258 break;
1259 case Opt_minorversion:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 rc = strict_strtoul(string, 10, &option);
1264 kfree(string);
1265 if (rc != 0)
1266 goto out_invalid_value;
1267 if (option > NFS4_MAX_MINOR_VERSION)
1268 goto out_invalid_value;
1269 mnt->minorversion = option;
1270 break;
1271
1272 /*
1273 * options that take text values
1274 */
1275 case Opt_sec:
1276 string = match_strdup(args);
1277 if (string == NULL)
1278 goto out_nomem;
1279 rc = nfs_parse_security_flavors(string, mnt);
1280 kfree(string);
1281 if (!rc) {
1282 dfprintk(MOUNT, "NFS: unrecognized "
1283 "security flavor\n");
1284 return 0;
1285 }
1286 break;
1287 case Opt_proto:
1288 string = match_strdup(args);
1289 if (string == NULL)
1290 goto out_nomem;
1291 token = match_token(string,
1292 nfs_xprt_protocol_tokens, args);
1293
1294 protofamily = AF_INET;
1295 switch (token) {
1296 case Opt_xprt_udp6:
1297 protofamily = AF_INET6;
1298 case Opt_xprt_udp:
1299 mnt->flags &= ~NFS_MOUNT_TCP;
1300 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1301 kfree(string);
1302 break;
1303 case Opt_xprt_tcp6:
1304 protofamily = AF_INET6;
1305 case Opt_xprt_tcp:
1306 mnt->flags |= NFS_MOUNT_TCP;
1307 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1308 kfree(string);
1309 break;
1310 case Opt_xprt_rdma:
1311 /* vector side protocols to TCP */
1312 mnt->flags |= NFS_MOUNT_TCP;
1313 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1314 xprt_load_transport(string);
1315 kfree(string);
1316 break;
1317 default:
1318 dfprintk(MOUNT, "NFS: unrecognized "
1319 "transport protocol\n");
1320 kfree(string);
1321 return 0;
1322 }
1323 break;
1324 case Opt_mountproto:
1325 string = match_strdup(args);
1326 if (string == NULL)
1327 goto out_nomem;
1328 token = match_token(string,
1329 nfs_xprt_protocol_tokens, args);
1330 kfree(string);
1331
1332 mountfamily = AF_INET;
1333 switch (token) {
1334 case Opt_xprt_udp6:
1335 mountfamily = AF_INET6;
1336 case Opt_xprt_udp:
1337 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1338 break;
1339 case Opt_xprt_tcp6:
1340 mountfamily = AF_INET6;
1341 case Opt_xprt_tcp:
1342 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1343 break;
1344 case Opt_xprt_rdma: /* not used for side protocols */
1345 default:
1346 dfprintk(MOUNT, "NFS: unrecognized "
1347 "transport protocol\n");
1348 return 0;
1349 }
1350 break;
1351 case Opt_addr:
1352 string = match_strdup(args);
1353 if (string == NULL)
1354 goto out_nomem;
1355 mnt->nfs_server.addrlen =
1356 rpc_pton(string, strlen(string),
1357 (struct sockaddr *)
1358 &mnt->nfs_server.address,
1359 sizeof(mnt->nfs_server.address));
1360 kfree(string);
1361 if (mnt->nfs_server.addrlen == 0)
1362 goto out_invalid_address;
1363 break;
1364 case Opt_clientaddr:
1365 string = match_strdup(args);
1366 if (string == NULL)
1367 goto out_nomem;
1368 kfree(mnt->client_address);
1369 mnt->client_address = string;
1370 break;
1371 case Opt_mounthost:
1372 string = match_strdup(args);
1373 if (string == NULL)
1374 goto out_nomem;
1375 kfree(mnt->mount_server.hostname);
1376 mnt->mount_server.hostname = string;
1377 break;
1378 case Opt_mountaddr:
1379 string = match_strdup(args);
1380 if (string == NULL)
1381 goto out_nomem;
1382 mnt->mount_server.addrlen =
1383 rpc_pton(string, strlen(string),
1384 (struct sockaddr *)
1385 &mnt->mount_server.address,
1386 sizeof(mnt->mount_server.address));
1387 kfree(string);
1388 if (mnt->mount_server.addrlen == 0)
1389 goto out_invalid_address;
1390 break;
1391 case Opt_lookupcache:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
1395 token = match_token(string,
1396 nfs_lookupcache_tokens, args);
1397 kfree(string);
1398 switch (token) {
1399 case Opt_lookupcache_all:
1400 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1401 break;
1402 case Opt_lookupcache_positive:
1403 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1404 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1405 break;
1406 case Opt_lookupcache_none:
1407 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1408 break;
1409 default:
1410 dfprintk(MOUNT, "NFS: invalid "
1411 "lookupcache argument\n");
1412 return 0;
1413 };
1414 break;
1415 case Opt_fscache_uniq:
1416 string = match_strdup(args);
1417 if (string == NULL)
1418 goto out_nomem;
1419 kfree(mnt->fscache_uniq);
1420 mnt->fscache_uniq = string;
1421 mnt->options |= NFS_OPTION_FSCACHE;
1422 break;
1423
1424 /*
1425 * Special options
1426 */
1427 case Opt_sloppy:
1428 sloppy = 1;
1429 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1430 break;
1431 case Opt_userspace:
1432 case Opt_deprecated:
1433 dfprintk(MOUNT, "NFS: ignoring mount option "
1434 "'%s'\n", p);
1435 break;
1436
1437 default:
1438 invalid_option = 1;
1439 dfprintk(MOUNT, "NFS: unrecognized mount option "
1440 "'%s'\n", p);
1441 }
1442 }
1443
1444 if (!sloppy && invalid_option)
1445 return 0;
1446
1447 /*
1448 * verify that any proto=/mountproto= options match the address
1449 * familiies in the addr=/mountaddr= options.
1450 */
1451 if (protofamily != AF_UNSPEC &&
1452 protofamily != mnt->nfs_server.address.ss_family)
1453 goto out_proto_mismatch;
1454
1455 if (mountfamily != AF_UNSPEC) {
1456 if (mnt->mount_server.addrlen) {
1457 if (mountfamily != mnt->mount_server.address.ss_family)
1458 goto out_mountproto_mismatch;
1459 } else {
1460 if (mountfamily != mnt->nfs_server.address.ss_family)
1461 goto out_mountproto_mismatch;
1462 }
1463 }
1464
1465 return 1;
1466
1467 out_mountproto_mismatch:
1468 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1469 "option\n");
1470 return 0;
1471 out_proto_mismatch:
1472 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1473 return 0;
1474 out_invalid_address:
1475 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1476 return 0;
1477 out_invalid_value:
1478 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1479 return 0;
1480 out_nomem:
1481 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1482 return 0;
1483 out_security_failure:
1484 free_secdata(secdata);
1485 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1486 return 0;
1487 }
1488
1489 /*
1490 * Match the requested auth flavors with the list returned by
1491 * the server. Returns zero and sets the mount's authentication
1492 * flavor on success; returns -EACCES if server does not support
1493 * the requested flavor.
1494 */
1495 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1496 struct nfs_mount_request *request)
1497 {
1498 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1499
1500 /*
1501 * Certain releases of Linux's mountd return an empty
1502 * flavor list. To prevent behavioral regression with
1503 * these servers (ie. rejecting mounts that used to
1504 * succeed), revert to pre-2.6.32 behavior (no checking)
1505 * if the returned flavor list is empty.
1506 */
1507 if (server_authlist_len == 0)
1508 return 0;
1509
1510 /*
1511 * We avoid sophisticated negotiating here, as there are
1512 * plenty of cases where we can get it wrong, providing
1513 * either too little or too much security.
1514 *
1515 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1516 * flavor listed first. However, some servers list
1517 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1518 * preferred default, in args->auth_flavors[0] if user
1519 * didn't specify sec= mount option.
1520 */
1521 for (i = 0; i < args->auth_flavor_len; i++)
1522 for (j = 0; j < server_authlist_len; j++)
1523 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1524 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1525 request->auth_flavs[j]);
1526 args->auth_flavors[0] = request->auth_flavs[j];
1527 return 0;
1528 }
1529
1530 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1531 nfs_umount(request);
1532 return -EACCES;
1533 }
1534
1535 /*
1536 * Use the remote server's MOUNT service to request the NFS file handle
1537 * corresponding to the provided path.
1538 */
1539 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1540 struct nfs_fh *root_fh)
1541 {
1542 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1543 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1544 struct nfs_mount_request request = {
1545 .sap = (struct sockaddr *)
1546 &args->mount_server.address,
1547 .dirpath = args->nfs_server.export_path,
1548 .protocol = args->mount_server.protocol,
1549 .fh = root_fh,
1550 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1551 .auth_flav_len = &server_authlist_len,
1552 .auth_flavs = server_authlist,
1553 };
1554 int status;
1555
1556 if (args->mount_server.version == 0) {
1557 switch (args->version) {
1558 default:
1559 args->mount_server.version = NFS_MNT3_VERSION;
1560 break;
1561 case 2:
1562 args->mount_server.version = NFS_MNT_VERSION;
1563 }
1564 }
1565 request.version = args->mount_server.version;
1566
1567 if (args->mount_server.hostname)
1568 request.hostname = args->mount_server.hostname;
1569 else
1570 request.hostname = args->nfs_server.hostname;
1571
1572 /*
1573 * Construct the mount server's address.
1574 */
1575 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1576 memcpy(request.sap, &args->nfs_server.address,
1577 args->nfs_server.addrlen);
1578 args->mount_server.addrlen = args->nfs_server.addrlen;
1579 }
1580 request.salen = args->mount_server.addrlen;
1581 nfs_set_port(request.sap, &args->mount_server.port, 0);
1582
1583 /*
1584 * Now ask the mount server to map our export path
1585 * to a file handle.
1586 */
1587 status = nfs_mount(&request);
1588 if (status != 0) {
1589 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1590 request.hostname, status);
1591 return status;
1592 }
1593
1594 /*
1595 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1596 */
1597 if (args->mount_server.version != NFS_MNT3_VERSION)
1598 return 0;
1599 return nfs_walk_authlist(args, &request);
1600 }
1601
1602 static int nfs_parse_simple_hostname(const char *dev_name,
1603 char **hostname, size_t maxnamlen,
1604 char **export_path, size_t maxpathlen)
1605 {
1606 size_t len;
1607 char *colon, *comma;
1608
1609 colon = strchr(dev_name, ':');
1610 if (colon == NULL)
1611 goto out_bad_devname;
1612
1613 len = colon - dev_name;
1614 if (len > maxnamlen)
1615 goto out_hostname;
1616
1617 /* N.B. caller will free nfs_server.hostname in all cases */
1618 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1619 if (!*hostname)
1620 goto out_nomem;
1621
1622 /* kill possible hostname list: not supported */
1623 comma = strchr(*hostname, ',');
1624 if (comma != NULL) {
1625 if (comma == *hostname)
1626 goto out_bad_devname;
1627 *comma = '\0';
1628 }
1629
1630 colon++;
1631 len = strlen(colon);
1632 if (len > maxpathlen)
1633 goto out_path;
1634 *export_path = kstrndup(colon, len, GFP_KERNEL);
1635 if (!*export_path)
1636 goto out_nomem;
1637
1638 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1639 return 0;
1640
1641 out_bad_devname:
1642 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1643 return -EINVAL;
1644
1645 out_nomem:
1646 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1647 return -ENOMEM;
1648
1649 out_hostname:
1650 dfprintk(MOUNT, "NFS: server hostname too long\n");
1651 return -ENAMETOOLONG;
1652
1653 out_path:
1654 dfprintk(MOUNT, "NFS: export pathname too long\n");
1655 return -ENAMETOOLONG;
1656 }
1657
1658 /*
1659 * Hostname has square brackets around it because it contains one or
1660 * more colons. We look for the first closing square bracket, and a
1661 * colon must follow it.
1662 */
1663 static int nfs_parse_protected_hostname(const char *dev_name,
1664 char **hostname, size_t maxnamlen,
1665 char **export_path, size_t maxpathlen)
1666 {
1667 size_t len;
1668 char *start, *end;
1669
1670 start = (char *)(dev_name + 1);
1671
1672 end = strchr(start, ']');
1673 if (end == NULL)
1674 goto out_bad_devname;
1675 if (*(end + 1) != ':')
1676 goto out_bad_devname;
1677
1678 len = end - start;
1679 if (len > maxnamlen)
1680 goto out_hostname;
1681
1682 /* N.B. caller will free nfs_server.hostname in all cases */
1683 *hostname = kstrndup(start, len, GFP_KERNEL);
1684 if (*hostname == NULL)
1685 goto out_nomem;
1686
1687 end += 2;
1688 len = strlen(end);
1689 if (len > maxpathlen)
1690 goto out_path;
1691 *export_path = kstrndup(end, len, GFP_KERNEL);
1692 if (!*export_path)
1693 goto out_nomem;
1694
1695 return 0;
1696
1697 out_bad_devname:
1698 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1699 return -EINVAL;
1700
1701 out_nomem:
1702 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1703 return -ENOMEM;
1704
1705 out_hostname:
1706 dfprintk(MOUNT, "NFS: server hostname too long\n");
1707 return -ENAMETOOLONG;
1708
1709 out_path:
1710 dfprintk(MOUNT, "NFS: export pathname too long\n");
1711 return -ENAMETOOLONG;
1712 }
1713
1714 /*
1715 * Split "dev_name" into "hostname:export_path".
1716 *
1717 * The leftmost colon demarks the split between the server's hostname
1718 * and the export path. If the hostname starts with a left square
1719 * bracket, then it may contain colons.
1720 *
1721 * Note: caller frees hostname and export path, even on error.
1722 */
1723 static int nfs_parse_devname(const char *dev_name,
1724 char **hostname, size_t maxnamlen,
1725 char **export_path, size_t maxpathlen)
1726 {
1727 if (*dev_name == '[')
1728 return nfs_parse_protected_hostname(dev_name,
1729 hostname, maxnamlen,
1730 export_path, maxpathlen);
1731
1732 return nfs_parse_simple_hostname(dev_name,
1733 hostname, maxnamlen,
1734 export_path, maxpathlen);
1735 }
1736
1737 /*
1738 * Validate the NFS2/NFS3 mount data
1739 * - fills in the mount root filehandle
1740 *
1741 * For option strings, user space handles the following behaviors:
1742 *
1743 * + DNS: mapping server host name to IP address ("addr=" option)
1744 *
1745 * + failure mode: how to behave if a mount request can't be handled
1746 * immediately ("fg/bg" option)
1747 *
1748 * + retry: how often to retry a mount request ("retry=" option)
1749 *
1750 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1751 * mountproto=tcp after mountproto=udp, and so on
1752 */
1753 static int nfs_validate_mount_data(void *options,
1754 struct nfs_parsed_mount_data *args,
1755 struct nfs_fh *mntfh,
1756 const char *dev_name)
1757 {
1758 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1759 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1760
1761 if (data == NULL)
1762 goto out_no_data;
1763
1764 switch (data->version) {
1765 case 1:
1766 data->namlen = 0;
1767 case 2:
1768 data->bsize = 0;
1769 case 3:
1770 if (data->flags & NFS_MOUNT_VER3)
1771 goto out_no_v3;
1772 data->root.size = NFS2_FHSIZE;
1773 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1774 case 4:
1775 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1776 goto out_no_sec;
1777 case 5:
1778 memset(data->context, 0, sizeof(data->context));
1779 case 6:
1780 if (data->flags & NFS_MOUNT_VER3) {
1781 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1782 goto out_invalid_fh;
1783 mntfh->size = data->root.size;
1784 args->version = 3;
1785 } else {
1786 mntfh->size = NFS2_FHSIZE;
1787 args->version = 2;
1788 }
1789
1790
1791 memcpy(mntfh->data, data->root.data, mntfh->size);
1792 if (mntfh->size < sizeof(mntfh->data))
1793 memset(mntfh->data + mntfh->size, 0,
1794 sizeof(mntfh->data) - mntfh->size);
1795
1796 /*
1797 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1798 * can deal with.
1799 */
1800 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1801 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1802 args->rsize = data->rsize;
1803 args->wsize = data->wsize;
1804 args->timeo = data->timeo;
1805 args->retrans = data->retrans;
1806 args->acregmin = data->acregmin;
1807 args->acregmax = data->acregmax;
1808 args->acdirmin = data->acdirmin;
1809 args->acdirmax = data->acdirmax;
1810
1811 memcpy(sap, &data->addr, sizeof(data->addr));
1812 args->nfs_server.addrlen = sizeof(data->addr);
1813 if (!nfs_verify_server_address(sap))
1814 goto out_no_address;
1815
1816 if (!(data->flags & NFS_MOUNT_TCP))
1817 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1818 /* N.B. caller will free nfs_server.hostname in all cases */
1819 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1820 args->namlen = data->namlen;
1821 args->bsize = data->bsize;
1822
1823 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1824 args->auth_flavors[0] = data->pseudoflavor;
1825 if (!args->nfs_server.hostname)
1826 goto out_nomem;
1827
1828 /*
1829 * The legacy version 6 binary mount data from userspace has a
1830 * field used only to transport selinux information into the
1831 * the kernel. To continue to support that functionality we
1832 * have a touch of selinux knowledge here in the NFS code. The
1833 * userspace code converted context=blah to just blah so we are
1834 * converting back to the full string selinux understands.
1835 */
1836 if (data->context[0]){
1837 #ifdef CONFIG_SECURITY_SELINUX
1838 int rc;
1839 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1840 if (!opts_str)
1841 return -ENOMEM;
1842 strcpy(opts_str, "context=");
1843 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1844 strcat(opts_str, &data->context[0]);
1845 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1846 kfree(opts_str);
1847 if (rc)
1848 return rc;
1849 #else
1850 return -EINVAL;
1851 #endif
1852 }
1853
1854 break;
1855 default: {
1856 int status;
1857
1858 if (nfs_parse_mount_options((char *)options, args) == 0)
1859 return -EINVAL;
1860
1861 if (!nfs_verify_server_address(sap))
1862 goto out_no_address;
1863
1864 if (args->version == 4)
1865 #ifdef CONFIG_NFS_V4
1866 return nfs4_validate_text_mount_data(options,
1867 args, dev_name);
1868 #else
1869 goto out_v4_not_compiled;
1870 #endif
1871
1872 nfs_set_port(sap, &args->nfs_server.port, 0);
1873
1874 nfs_set_mount_transport_protocol(args);
1875
1876 status = nfs_parse_devname(dev_name,
1877 &args->nfs_server.hostname,
1878 PAGE_SIZE,
1879 &args->nfs_server.export_path,
1880 NFS_MAXPATHLEN);
1881 if (!status)
1882 status = nfs_try_mount(args, mntfh);
1883
1884 kfree(args->nfs_server.export_path);
1885 args->nfs_server.export_path = NULL;
1886
1887 if (status)
1888 return status;
1889
1890 break;
1891 }
1892 }
1893
1894 #ifndef CONFIG_NFS_V3
1895 if (args->version == 3)
1896 goto out_v3_not_compiled;
1897 #endif /* !CONFIG_NFS_V3 */
1898
1899 return 0;
1900
1901 out_no_data:
1902 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1903 return -EINVAL;
1904
1905 out_no_v3:
1906 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1907 data->version);
1908 return -EINVAL;
1909
1910 out_no_sec:
1911 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1912 return -EINVAL;
1913
1914 #ifndef CONFIG_NFS_V3
1915 out_v3_not_compiled:
1916 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1917 return -EPROTONOSUPPORT;
1918 #endif /* !CONFIG_NFS_V3 */
1919
1920 #ifndef CONFIG_NFS_V4
1921 out_v4_not_compiled:
1922 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1923 return -EPROTONOSUPPORT;
1924 #endif /* !CONFIG_NFS_V4 */
1925
1926 out_nomem:
1927 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1928 return -ENOMEM;
1929
1930 out_no_address:
1931 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1932 return -EINVAL;
1933
1934 out_invalid_fh:
1935 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1936 return -EINVAL;
1937 }
1938
1939 static int
1940 nfs_compare_remount_data(struct nfs_server *nfss,
1941 struct nfs_parsed_mount_data *data)
1942 {
1943 if (data->flags != nfss->flags ||
1944 data->rsize != nfss->rsize ||
1945 data->wsize != nfss->wsize ||
1946 data->retrans != nfss->client->cl_timeout->to_retries ||
1947 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1948 data->acregmin != nfss->acregmin / HZ ||
1949 data->acregmax != nfss->acregmax / HZ ||
1950 data->acdirmin != nfss->acdirmin / HZ ||
1951 data->acdirmax != nfss->acdirmax / HZ ||
1952 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1953 data->nfs_server.port != nfss->port ||
1954 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1955 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1956 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1957 return -EINVAL;
1958
1959 return 0;
1960 }
1961
1962 static int
1963 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1964 {
1965 int error;
1966 struct nfs_server *nfss = sb->s_fs_info;
1967 struct nfs_parsed_mount_data *data;
1968 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1969 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1970 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1971
1972 /*
1973 * Userspace mount programs that send binary options generally send
1974 * them populated with default values. We have no way to know which
1975 * ones were explicitly specified. Fall back to legacy behavior and
1976 * just return success.
1977 */
1978 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1979 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1980 options->version <= 6))))
1981 return 0;
1982
1983 data = kzalloc(sizeof(*data), GFP_KERNEL);
1984 if (data == NULL)
1985 return -ENOMEM;
1986
1987 /* fill out struct with values from existing mount */
1988 data->flags = nfss->flags;
1989 data->rsize = nfss->rsize;
1990 data->wsize = nfss->wsize;
1991 data->retrans = nfss->client->cl_timeout->to_retries;
1992 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1993 data->acregmin = nfss->acregmin / HZ;
1994 data->acregmax = nfss->acregmax / HZ;
1995 data->acdirmin = nfss->acdirmin / HZ;
1996 data->acdirmax = nfss->acdirmax / HZ;
1997 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1998 data->nfs_server.port = nfss->port;
1999 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2000 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2001 data->nfs_server.addrlen);
2002
2003 /* overwrite those values with any that were specified */
2004 error = nfs_parse_mount_options((char *)options, data);
2005 if (error < 0)
2006 goto out;
2007
2008 /* compare new mount options with old ones */
2009 error = nfs_compare_remount_data(nfss, data);
2010 out:
2011 kfree(data);
2012 return error;
2013 }
2014
2015 /*
2016 * Initialise the common bits of the superblock
2017 */
2018 static inline void nfs_initialise_sb(struct super_block *sb)
2019 {
2020 struct nfs_server *server = NFS_SB(sb);
2021
2022 sb->s_magic = NFS_SUPER_MAGIC;
2023
2024 /* We probably want something more informative here */
2025 snprintf(sb->s_id, sizeof(sb->s_id),
2026 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2027
2028 if (sb->s_blocksize == 0)
2029 sb->s_blocksize = nfs_block_bits(server->wsize,
2030 &sb->s_blocksize_bits);
2031
2032 if (server->flags & NFS_MOUNT_NOAC)
2033 sb->s_flags |= MS_SYNCHRONOUS;
2034
2035 sb->s_bdi = &server->backing_dev_info;
2036
2037 nfs_super_set_maxbytes(sb, server->maxfilesize);
2038 }
2039
2040 /*
2041 * Finish setting up an NFS2/3 superblock
2042 */
2043 static void nfs_fill_super(struct super_block *sb,
2044 struct nfs_parsed_mount_data *data)
2045 {
2046 struct nfs_server *server = NFS_SB(sb);
2047
2048 sb->s_blocksize_bits = 0;
2049 sb->s_blocksize = 0;
2050 if (data->bsize)
2051 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2052
2053 if (server->nfs_client->rpc_ops->version == 3) {
2054 /* The VFS shouldn't apply the umask to mode bits. We will do
2055 * so ourselves when necessary.
2056 */
2057 sb->s_flags |= MS_POSIXACL;
2058 sb->s_time_gran = 1;
2059 }
2060
2061 sb->s_op = &nfs_sops;
2062 nfs_initialise_sb(sb);
2063 }
2064
2065 /*
2066 * Finish setting up a cloned NFS2/3 superblock
2067 */
2068 static void nfs_clone_super(struct super_block *sb,
2069 const struct super_block *old_sb)
2070 {
2071 struct nfs_server *server = NFS_SB(sb);
2072
2073 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2074 sb->s_blocksize = old_sb->s_blocksize;
2075 sb->s_maxbytes = old_sb->s_maxbytes;
2076
2077 if (server->nfs_client->rpc_ops->version == 3) {
2078 /* The VFS shouldn't apply the umask to mode bits. We will do
2079 * so ourselves when necessary.
2080 */
2081 sb->s_flags |= MS_POSIXACL;
2082 sb->s_time_gran = 1;
2083 }
2084
2085 sb->s_op = old_sb->s_op;
2086 nfs_initialise_sb(sb);
2087 }
2088
2089 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2090 {
2091 const struct nfs_server *a = s->s_fs_info;
2092 const struct rpc_clnt *clnt_a = a->client;
2093 const struct rpc_clnt *clnt_b = b->client;
2094
2095 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2096 goto Ebusy;
2097 if (a->nfs_client != b->nfs_client)
2098 goto Ebusy;
2099 if (a->flags != b->flags)
2100 goto Ebusy;
2101 if (a->wsize != b->wsize)
2102 goto Ebusy;
2103 if (a->rsize != b->rsize)
2104 goto Ebusy;
2105 if (a->acregmin != b->acregmin)
2106 goto Ebusy;
2107 if (a->acregmax != b->acregmax)
2108 goto Ebusy;
2109 if (a->acdirmin != b->acdirmin)
2110 goto Ebusy;
2111 if (a->acdirmax != b->acdirmax)
2112 goto Ebusy;
2113 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2114 goto Ebusy;
2115 return 1;
2116 Ebusy:
2117 return 0;
2118 }
2119
2120 struct nfs_sb_mountdata {
2121 struct nfs_server *server;
2122 int mntflags;
2123 };
2124
2125 static int nfs_set_super(struct super_block *s, void *data)
2126 {
2127 struct nfs_sb_mountdata *sb_mntdata = data;
2128 struct nfs_server *server = sb_mntdata->server;
2129 int ret;
2130
2131 s->s_flags = sb_mntdata->mntflags;
2132 s->s_fs_info = server;
2133 ret = set_anon_super(s, server);
2134 if (ret == 0)
2135 server->s_dev = s->s_dev;
2136 return ret;
2137 }
2138
2139 static int nfs_compare_super_address(struct nfs_server *server1,
2140 struct nfs_server *server2)
2141 {
2142 struct sockaddr *sap1, *sap2;
2143
2144 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2145 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2146
2147 if (sap1->sa_family != sap2->sa_family)
2148 return 0;
2149
2150 switch (sap1->sa_family) {
2151 case AF_INET: {
2152 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2153 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2154 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2155 return 0;
2156 if (sin1->sin_port != sin2->sin_port)
2157 return 0;
2158 break;
2159 }
2160 case AF_INET6: {
2161 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2162 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2163 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2164 return 0;
2165 if (sin1->sin6_port != sin2->sin6_port)
2166 return 0;
2167 break;
2168 }
2169 default:
2170 return 0;
2171 }
2172
2173 return 1;
2174 }
2175
2176 static int nfs_compare_super(struct super_block *sb, void *data)
2177 {
2178 struct nfs_sb_mountdata *sb_mntdata = data;
2179 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2180 int mntflags = sb_mntdata->mntflags;
2181
2182 if (!nfs_compare_super_address(old, server))
2183 return 0;
2184 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2185 if (old->flags & NFS_MOUNT_UNSHARED)
2186 return 0;
2187 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2188 return 0;
2189 return nfs_compare_mount_options(sb, server, mntflags);
2190 }
2191
2192 static int nfs_bdi_register(struct nfs_server *server)
2193 {
2194 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2195 }
2196
2197 static int nfs_get_sb(struct file_system_type *fs_type,
2198 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2199 {
2200 struct nfs_server *server = NULL;
2201 struct super_block *s;
2202 struct nfs_parsed_mount_data *data;
2203 struct nfs_fh *mntfh;
2204 struct dentry *mntroot;
2205 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2206 struct nfs_sb_mountdata sb_mntdata = {
2207 .mntflags = flags,
2208 };
2209 int error = -ENOMEM;
2210
2211 data = nfs_alloc_parsed_mount_data(3);
2212 mntfh = nfs_alloc_fhandle();
2213 if (data == NULL || mntfh == NULL)
2214 goto out_free_fh;
2215
2216 security_init_mnt_opts(&data->lsm_opts);
2217
2218 /* Validate the mount data */
2219 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2220 if (error < 0)
2221 goto out;
2222
2223 #ifdef CONFIG_NFS_V4
2224 if (data->version == 4) {
2225 error = nfs4_try_mount(flags, dev_name, data, mnt);
2226 kfree(data->client_address);
2227 kfree(data->nfs_server.export_path);
2228 goto out;
2229 }
2230 #endif /* CONFIG_NFS_V4 */
2231
2232 /* Get a volume representation */
2233 server = nfs_create_server(data, mntfh);
2234 if (IS_ERR(server)) {
2235 error = PTR_ERR(server);
2236 goto out;
2237 }
2238 sb_mntdata.server = server;
2239
2240 if (server->flags & NFS_MOUNT_UNSHARED)
2241 compare_super = NULL;
2242
2243 /* Get a superblock - note that we may end up sharing one that already exists */
2244 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2245 if (IS_ERR(s)) {
2246 error = PTR_ERR(s);
2247 goto out_err_nosb;
2248 }
2249
2250 if (s->s_fs_info != server) {
2251 nfs_free_server(server);
2252 server = NULL;
2253 } else {
2254 error = nfs_bdi_register(server);
2255 if (error)
2256 goto error_splat_bdi;
2257 }
2258
2259 if (!s->s_root) {
2260 /* initial superblock/root creation */
2261 nfs_fill_super(s, data);
2262 nfs_fscache_get_super_cookie(
2263 s, data ? data->fscache_uniq : NULL, NULL);
2264 }
2265
2266 mntroot = nfs_get_root(s, mntfh);
2267 if (IS_ERR(mntroot)) {
2268 error = PTR_ERR(mntroot);
2269 goto error_splat_super;
2270 }
2271
2272 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2273 if (error)
2274 goto error_splat_root;
2275
2276 s->s_flags |= MS_ACTIVE;
2277 mnt->mnt_sb = s;
2278 mnt->mnt_root = mntroot;
2279 error = 0;
2280
2281 out:
2282 kfree(data->nfs_server.hostname);
2283 kfree(data->mount_server.hostname);
2284 kfree(data->fscache_uniq);
2285 security_free_mnt_opts(&data->lsm_opts);
2286 out_free_fh:
2287 nfs_free_fhandle(mntfh);
2288 kfree(data);
2289 return error;
2290
2291 out_err_nosb:
2292 nfs_free_server(server);
2293 goto out;
2294
2295 error_splat_root:
2296 dput(mntroot);
2297 error_splat_super:
2298 if (server && !s->s_root)
2299 bdi_unregister(&server->backing_dev_info);
2300 error_splat_bdi:
2301 deactivate_locked_super(s);
2302 goto out;
2303 }
2304
2305 /*
2306 * Ensure that we unregister the bdi before kill_anon_super
2307 * releases the device name
2308 */
2309 static void nfs_put_super(struct super_block *s)
2310 {
2311 struct nfs_server *server = NFS_SB(s);
2312
2313 bdi_unregister(&server->backing_dev_info);
2314 }
2315
2316 /*
2317 * Destroy an NFS2/3 superblock
2318 */
2319 static void nfs_kill_super(struct super_block *s)
2320 {
2321 struct nfs_server *server = NFS_SB(s);
2322
2323 kill_anon_super(s);
2324 nfs_fscache_release_super_cookie(s);
2325 nfs_free_server(server);
2326 }
2327
2328 /*
2329 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2330 */
2331 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2332 const char *dev_name, void *raw_data,
2333 struct vfsmount *mnt)
2334 {
2335 struct nfs_clone_mount *data = raw_data;
2336 struct super_block *s;
2337 struct nfs_server *server;
2338 struct dentry *mntroot;
2339 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2340 struct nfs_sb_mountdata sb_mntdata = {
2341 .mntflags = flags,
2342 };
2343 int error;
2344
2345 dprintk("--> nfs_xdev_get_sb()\n");
2346
2347 /* create a new volume representation */
2348 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2349 if (IS_ERR(server)) {
2350 error = PTR_ERR(server);
2351 goto out_err_noserver;
2352 }
2353 sb_mntdata.server = server;
2354
2355 if (server->flags & NFS_MOUNT_UNSHARED)
2356 compare_super = NULL;
2357
2358 /* Get a superblock - note that we may end up sharing one that already exists */
2359 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2360 if (IS_ERR(s)) {
2361 error = PTR_ERR(s);
2362 goto out_err_nosb;
2363 }
2364
2365 if (s->s_fs_info != server) {
2366 nfs_free_server(server);
2367 server = NULL;
2368 } else {
2369 error = nfs_bdi_register(server);
2370 if (error)
2371 goto error_splat_bdi;
2372 }
2373
2374 if (!s->s_root) {
2375 /* initial superblock/root creation */
2376 nfs_clone_super(s, data->sb);
2377 nfs_fscache_get_super_cookie(s, NULL, data);
2378 }
2379
2380 mntroot = nfs_get_root(s, data->fh);
2381 if (IS_ERR(mntroot)) {
2382 error = PTR_ERR(mntroot);
2383 goto error_splat_super;
2384 }
2385 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2386 dput(mntroot);
2387 error = -ESTALE;
2388 goto error_splat_super;
2389 }
2390
2391 s->s_flags |= MS_ACTIVE;
2392 mnt->mnt_sb = s;
2393 mnt->mnt_root = mntroot;
2394
2395 /* clone any lsm security options from the parent to the new sb */
2396 security_sb_clone_mnt_opts(data->sb, s);
2397
2398 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2399 return 0;
2400
2401 out_err_nosb:
2402 nfs_free_server(server);
2403 out_err_noserver:
2404 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2405 return error;
2406
2407 error_splat_super:
2408 if (server && !s->s_root)
2409 bdi_unregister(&server->backing_dev_info);
2410 error_splat_bdi:
2411 deactivate_locked_super(s);
2412 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2413 return error;
2414 }
2415
2416 #ifdef CONFIG_NFS_V4
2417
2418 /*
2419 * Finish setting up a cloned NFS4 superblock
2420 */
2421 static void nfs4_clone_super(struct super_block *sb,
2422 const struct super_block *old_sb)
2423 {
2424 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2425 sb->s_blocksize = old_sb->s_blocksize;
2426 sb->s_maxbytes = old_sb->s_maxbytes;
2427 sb->s_time_gran = 1;
2428 sb->s_op = old_sb->s_op;
2429 nfs_initialise_sb(sb);
2430 }
2431
2432 /*
2433 * Set up an NFS4 superblock
2434 */
2435 static void nfs4_fill_super(struct super_block *sb)
2436 {
2437 sb->s_time_gran = 1;
2438 sb->s_op = &nfs4_sops;
2439 nfs_initialise_sb(sb);
2440 }
2441
2442 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2443 {
2444 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2445 }
2446
2447 static int nfs4_validate_text_mount_data(void *options,
2448 struct nfs_parsed_mount_data *args,
2449 const char *dev_name)
2450 {
2451 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2452
2453 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2454
2455 nfs_validate_transport_protocol(args);
2456
2457 nfs4_validate_mount_flags(args);
2458
2459 if (args->version != 4) {
2460 dfprintk(MOUNT,
2461 "NFS4: Illegal mount version\n");
2462 return -EINVAL;
2463 }
2464
2465 if (args->auth_flavor_len > 1) {
2466 dfprintk(MOUNT,
2467 "NFS4: Too many RPC auth flavours specified\n");
2468 return -EINVAL;
2469 }
2470
2471 if (args->client_address == NULL) {
2472 dfprintk(MOUNT,
2473 "NFS4: mount program didn't pass callback address\n");
2474 return -EINVAL;
2475 }
2476
2477 return nfs_parse_devname(dev_name,
2478 &args->nfs_server.hostname,
2479 NFS4_MAXNAMLEN,
2480 &args->nfs_server.export_path,
2481 NFS4_MAXPATHLEN);
2482 }
2483
2484 /*
2485 * Validate NFSv4 mount options
2486 */
2487 static int nfs4_validate_mount_data(void *options,
2488 struct nfs_parsed_mount_data *args,
2489 const char *dev_name)
2490 {
2491 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2492 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2493 char *c;
2494
2495 if (data == NULL)
2496 goto out_no_data;
2497
2498 switch (data->version) {
2499 case 1:
2500 if (data->host_addrlen > sizeof(args->nfs_server.address))
2501 goto out_no_address;
2502 if (data->host_addrlen == 0)
2503 goto out_no_address;
2504 args->nfs_server.addrlen = data->host_addrlen;
2505 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2506 return -EFAULT;
2507 if (!nfs_verify_server_address(sap))
2508 goto out_no_address;
2509
2510 if (data->auth_flavourlen) {
2511 if (data->auth_flavourlen > 1)
2512 goto out_inval_auth;
2513 if (copy_from_user(&args->auth_flavors[0],
2514 data->auth_flavours,
2515 sizeof(args->auth_flavors[0])))
2516 return -EFAULT;
2517 }
2518
2519 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2520 if (IS_ERR(c))
2521 return PTR_ERR(c);
2522 args->nfs_server.hostname = c;
2523
2524 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2525 if (IS_ERR(c))
2526 return PTR_ERR(c);
2527 args->nfs_server.export_path = c;
2528 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2529
2530 c = strndup_user(data->client_addr.data, 16);
2531 if (IS_ERR(c))
2532 return PTR_ERR(c);
2533 args->client_address = c;
2534
2535 /*
2536 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2537 * can deal with.
2538 */
2539
2540 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2541 args->rsize = data->rsize;
2542 args->wsize = data->wsize;
2543 args->timeo = data->timeo;
2544 args->retrans = data->retrans;
2545 args->acregmin = data->acregmin;
2546 args->acregmax = data->acregmax;
2547 args->acdirmin = data->acdirmin;
2548 args->acdirmax = data->acdirmax;
2549 args->nfs_server.protocol = data->proto;
2550 nfs_validate_transport_protocol(args);
2551
2552 break;
2553 default:
2554 if (nfs_parse_mount_options((char *)options, args) == 0)
2555 return -EINVAL;
2556
2557 if (!nfs_verify_server_address(sap))
2558 return -EINVAL;
2559
2560 return nfs4_validate_text_mount_data(options, args, dev_name);
2561 }
2562
2563 return 0;
2564
2565 out_no_data:
2566 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2567 return -EINVAL;
2568
2569 out_inval_auth:
2570 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2571 data->auth_flavourlen);
2572 return -EINVAL;
2573
2574 out_no_address:
2575 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2576 return -EINVAL;
2577 }
2578
2579 /*
2580 * Get the superblock for the NFS4 root partition
2581 */
2582 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2583 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2584 {
2585 struct nfs_parsed_mount_data *data = raw_data;
2586 struct super_block *s;
2587 struct nfs_server *server;
2588 struct nfs_fh *mntfh;
2589 struct dentry *mntroot;
2590 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2591 struct nfs_sb_mountdata sb_mntdata = {
2592 .mntflags = flags,
2593 };
2594 int error = -ENOMEM;
2595
2596 mntfh = nfs_alloc_fhandle();
2597 if (data == NULL || mntfh == NULL)
2598 goto out_free_fh;
2599
2600 security_init_mnt_opts(&data->lsm_opts);
2601
2602 /* Get a volume representation */
2603 server = nfs4_create_server(data, mntfh);
2604 if (IS_ERR(server)) {
2605 error = PTR_ERR(server);
2606 goto out;
2607 }
2608 sb_mntdata.server = server;
2609
2610 if (server->flags & NFS4_MOUNT_UNSHARED)
2611 compare_super = NULL;
2612
2613 /* Get a superblock - note that we may end up sharing one that already exists */
2614 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2615 if (IS_ERR(s)) {
2616 error = PTR_ERR(s);
2617 goto out_free;
2618 }
2619
2620 if (s->s_fs_info != server) {
2621 nfs_free_server(server);
2622 server = NULL;
2623 } else {
2624 error = nfs_bdi_register(server);
2625 if (error)
2626 goto error_splat_bdi;
2627 }
2628
2629 if (!s->s_root) {
2630 /* initial superblock/root creation */
2631 nfs4_fill_super(s);
2632 nfs_fscache_get_super_cookie(
2633 s, data ? data->fscache_uniq : NULL, NULL);
2634 }
2635
2636 mntroot = nfs4_get_root(s, mntfh);
2637 if (IS_ERR(mntroot)) {
2638 error = PTR_ERR(mntroot);
2639 goto error_splat_super;
2640 }
2641
2642 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2643 if (error)
2644 goto error_splat_root;
2645
2646 s->s_flags |= MS_ACTIVE;
2647 mnt->mnt_sb = s;
2648 mnt->mnt_root = mntroot;
2649 error = 0;
2650
2651 out:
2652 security_free_mnt_opts(&data->lsm_opts);
2653 out_free_fh:
2654 nfs_free_fhandle(mntfh);
2655 return error;
2656
2657 out_free:
2658 nfs_free_server(server);
2659 goto out;
2660
2661 error_splat_root:
2662 dput(mntroot);
2663 error_splat_super:
2664 if (server && !s->s_root)
2665 bdi_unregister(&server->backing_dev_info);
2666 error_splat_bdi:
2667 deactivate_locked_super(s);
2668 goto out;
2669 }
2670
2671 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2672 int flags, void *data, const char *hostname)
2673 {
2674 struct vfsmount *root_mnt;
2675 char *root_devname;
2676 size_t len;
2677
2678 len = strlen(hostname) + 3;
2679 root_devname = kmalloc(len, GFP_KERNEL);
2680 if (root_devname == NULL)
2681 return ERR_PTR(-ENOMEM);
2682 snprintf(root_devname, len, "%s:/", hostname);
2683 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2684 kfree(root_devname);
2685 return root_mnt;
2686 }
2687
2688 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2689 {
2690 char *page = (char *) __get_free_page(GFP_KERNEL);
2691 char *devname, *tmp;
2692
2693 if (page == NULL)
2694 return;
2695 devname = nfs_path(path->mnt->mnt_devname,
2696 path->mnt->mnt_root, path->dentry,
2697 page, PAGE_SIZE);
2698 if (IS_ERR(devname))
2699 goto out_freepage;
2700 tmp = kstrdup(devname, GFP_KERNEL);
2701 if (tmp == NULL)
2702 goto out_freepage;
2703 kfree(mnt->mnt_devname);
2704 mnt->mnt_devname = tmp;
2705 out_freepage:
2706 free_page((unsigned long)page);
2707 }
2708
2709 struct nfs_referral_count {
2710 struct list_head list;
2711 const struct task_struct *task;
2712 unsigned int referral_count;
2713 };
2714
2715 static LIST_HEAD(nfs_referral_count_list);
2716 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2717
2718 static struct nfs_referral_count *nfs_find_referral_count(void)
2719 {
2720 struct nfs_referral_count *p;
2721
2722 list_for_each_entry(p, &nfs_referral_count_list, list) {
2723 if (p->task == current)
2724 return p;
2725 }
2726 return NULL;
2727 }
2728
2729 #define NFS_MAX_NESTED_REFERRALS 2
2730
2731 static int nfs_referral_loop_protect(void)
2732 {
2733 struct nfs_referral_count *p, *new;
2734 int ret = -ENOMEM;
2735
2736 new = kmalloc(sizeof(*new), GFP_KERNEL);
2737 if (!new)
2738 goto out;
2739 new->task = current;
2740 new->referral_count = 1;
2741
2742 ret = 0;
2743 spin_lock(&nfs_referral_count_list_lock);
2744 p = nfs_find_referral_count();
2745 if (p != NULL) {
2746 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2747 ret = -ELOOP;
2748 else
2749 p->referral_count++;
2750 } else {
2751 list_add(&new->list, &nfs_referral_count_list);
2752 new = NULL;
2753 }
2754 spin_unlock(&nfs_referral_count_list_lock);
2755 kfree(new);
2756 out:
2757 return ret;
2758 }
2759
2760 static void nfs_referral_loop_unprotect(void)
2761 {
2762 struct nfs_referral_count *p;
2763
2764 spin_lock(&nfs_referral_count_list_lock);
2765 p = nfs_find_referral_count();
2766 p->referral_count--;
2767 if (p->referral_count == 0)
2768 list_del(&p->list);
2769 else
2770 p = NULL;
2771 spin_unlock(&nfs_referral_count_list_lock);
2772 kfree(p);
2773 }
2774
2775 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2776 const char *export_path, struct vfsmount *mnt_target)
2777 {
2778 struct nameidata *nd = NULL;
2779 struct mnt_namespace *ns_private;
2780 struct super_block *s;
2781 int ret;
2782
2783 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2784 if (nd == NULL)
2785 return -ENOMEM;
2786
2787 ns_private = create_mnt_ns(root_mnt);
2788 ret = PTR_ERR(ns_private);
2789 if (IS_ERR(ns_private))
2790 goto out_mntput;
2791
2792 ret = nfs_referral_loop_protect();
2793 if (ret != 0)
2794 goto out_put_mnt_ns;
2795
2796 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2797 export_path, LOOKUP_FOLLOW, nd);
2798
2799 nfs_referral_loop_unprotect();
2800 put_mnt_ns(ns_private);
2801
2802 if (ret != 0)
2803 goto out_err;
2804
2805 s = nd->path.mnt->mnt_sb;
2806 atomic_inc(&s->s_active);
2807 mnt_target->mnt_sb = s;
2808 mnt_target->mnt_root = dget(nd->path.dentry);
2809
2810 /* Correct the device pathname */
2811 nfs_fix_devname(&nd->path, mnt_target);
2812
2813 path_put(&nd->path);
2814 kfree(nd);
2815 down_write(&s->s_umount);
2816 return 0;
2817 out_put_mnt_ns:
2818 put_mnt_ns(ns_private);
2819 out_mntput:
2820 mntput(root_mnt);
2821 out_err:
2822 kfree(nd);
2823 return ret;
2824 }
2825
2826 static int nfs4_try_mount(int flags, const char *dev_name,
2827 struct nfs_parsed_mount_data *data,
2828 struct vfsmount *mnt)
2829 {
2830 char *export_path;
2831 struct vfsmount *root_mnt;
2832 int error;
2833
2834 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2835
2836 export_path = data->nfs_server.export_path;
2837 data->nfs_server.export_path = "/";
2838 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2839 data->nfs_server.hostname);
2840 data->nfs_server.export_path = export_path;
2841
2842 error = PTR_ERR(root_mnt);
2843 if (IS_ERR(root_mnt))
2844 goto out;
2845
2846 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2847
2848 out:
2849 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2850 error != 0 ? " [error]" : "");
2851 return error;
2852 }
2853
2854 /*
2855 * Get the superblock for an NFS4 mountpoint
2856 */
2857 static int nfs4_get_sb(struct file_system_type *fs_type,
2858 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2859 {
2860 struct nfs_parsed_mount_data *data;
2861 int error = -ENOMEM;
2862
2863 data = nfs_alloc_parsed_mount_data(4);
2864 if (data == NULL)
2865 goto out_free_data;
2866
2867 /* Validate the mount data */
2868 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2869 if (error < 0)
2870 goto out;
2871
2872 error = nfs4_try_mount(flags, dev_name, data, mnt);
2873
2874 out:
2875 kfree(data->client_address);
2876 kfree(data->nfs_server.export_path);
2877 kfree(data->nfs_server.hostname);
2878 kfree(data->fscache_uniq);
2879 out_free_data:
2880 kfree(data);
2881 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2882 error != 0 ? " [error]" : "");
2883 return error;
2884 }
2885
2886 static void nfs4_kill_super(struct super_block *sb)
2887 {
2888 struct nfs_server *server = NFS_SB(sb);
2889
2890 dprintk("--> %s\n", __func__);
2891 nfs_super_return_all_delegations(sb);
2892 kill_anon_super(sb);
2893 nfs_fscache_release_super_cookie(sb);
2894 nfs_free_server(server);
2895 dprintk("<-- %s\n", __func__);
2896 }
2897
2898 /*
2899 * Clone an NFS4 server record on xdev traversal (FSID-change)
2900 */
2901 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2902 const char *dev_name, void *raw_data,
2903 struct vfsmount *mnt)
2904 {
2905 struct nfs_clone_mount *data = raw_data;
2906 struct super_block *s;
2907 struct nfs_server *server;
2908 struct dentry *mntroot;
2909 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2910 struct nfs_sb_mountdata sb_mntdata = {
2911 .mntflags = flags,
2912 };
2913 int error;
2914
2915 dprintk("--> nfs4_xdev_get_sb()\n");
2916
2917 /* create a new volume representation */
2918 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2919 if (IS_ERR(server)) {
2920 error = PTR_ERR(server);
2921 goto out_err_noserver;
2922 }
2923 sb_mntdata.server = server;
2924
2925 if (server->flags & NFS4_MOUNT_UNSHARED)
2926 compare_super = NULL;
2927
2928 /* Get a superblock - note that we may end up sharing one that already exists */
2929 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2930 if (IS_ERR(s)) {
2931 error = PTR_ERR(s);
2932 goto out_err_nosb;
2933 }
2934
2935 if (s->s_fs_info != server) {
2936 nfs_free_server(server);
2937 server = NULL;
2938 } else {
2939 error = nfs_bdi_register(server);
2940 if (error)
2941 goto error_splat_bdi;
2942 }
2943
2944 if (!s->s_root) {
2945 /* initial superblock/root creation */
2946 nfs4_clone_super(s, data->sb);
2947 nfs_fscache_get_super_cookie(s, NULL, data);
2948 }
2949
2950 mntroot = nfs4_get_root(s, data->fh);
2951 if (IS_ERR(mntroot)) {
2952 error = PTR_ERR(mntroot);
2953 goto error_splat_super;
2954 }
2955 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2956 dput(mntroot);
2957 error = -ESTALE;
2958 goto error_splat_super;
2959 }
2960
2961 s->s_flags |= MS_ACTIVE;
2962 mnt->mnt_sb = s;
2963 mnt->mnt_root = mntroot;
2964
2965 security_sb_clone_mnt_opts(data->sb, s);
2966
2967 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2968 return 0;
2969
2970 out_err_nosb:
2971 nfs_free_server(server);
2972 out_err_noserver:
2973 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2974 return error;
2975
2976 error_splat_super:
2977 if (server && !s->s_root)
2978 bdi_unregister(&server->backing_dev_info);
2979 error_splat_bdi:
2980 deactivate_locked_super(s);
2981 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2982 return error;
2983 }
2984
2985 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2986 int flags, const char *dev_name, void *raw_data,
2987 struct vfsmount *mnt)
2988 {
2989 struct nfs_clone_mount *data = raw_data;
2990 struct super_block *s;
2991 struct nfs_server *server;
2992 struct dentry *mntroot;
2993 struct nfs_fh *mntfh;
2994 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2995 struct nfs_sb_mountdata sb_mntdata = {
2996 .mntflags = flags,
2997 };
2998 int error = -ENOMEM;
2999
3000 dprintk("--> nfs4_referral_get_sb()\n");
3001
3002 mntfh = nfs_alloc_fhandle();
3003 if (mntfh == NULL)
3004 goto out_err_nofh;
3005
3006 /* create a new volume representation */
3007 server = nfs4_create_referral_server(data, mntfh);
3008 if (IS_ERR(server)) {
3009 error = PTR_ERR(server);
3010 goto out_err_noserver;
3011 }
3012 sb_mntdata.server = server;
3013
3014 if (server->flags & NFS4_MOUNT_UNSHARED)
3015 compare_super = NULL;
3016
3017 /* Get a superblock - note that we may end up sharing one that already exists */
3018 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3019 if (IS_ERR(s)) {
3020 error = PTR_ERR(s);
3021 goto out_err_nosb;
3022 }
3023
3024 if (s->s_fs_info != server) {
3025 nfs_free_server(server);
3026 server = NULL;
3027 } else {
3028 error = nfs_bdi_register(server);
3029 if (error)
3030 goto error_splat_bdi;
3031 }
3032
3033 if (!s->s_root) {
3034 /* initial superblock/root creation */
3035 nfs4_fill_super(s);
3036 nfs_fscache_get_super_cookie(s, NULL, data);
3037 }
3038
3039 mntroot = nfs4_get_root(s, mntfh);
3040 if (IS_ERR(mntroot)) {
3041 error = PTR_ERR(mntroot);
3042 goto error_splat_super;
3043 }
3044 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3045 dput(mntroot);
3046 error = -ESTALE;
3047 goto error_splat_super;
3048 }
3049
3050 s->s_flags |= MS_ACTIVE;
3051 mnt->mnt_sb = s;
3052 mnt->mnt_root = mntroot;
3053
3054 security_sb_clone_mnt_opts(data->sb, s);
3055
3056 nfs_free_fhandle(mntfh);
3057 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3058 return 0;
3059
3060 out_err_nosb:
3061 nfs_free_server(server);
3062 out_err_noserver:
3063 nfs_free_fhandle(mntfh);
3064 out_err_nofh:
3065 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3066 return error;
3067
3068 error_splat_super:
3069 if (server && !s->s_root)
3070 bdi_unregister(&server->backing_dev_info);
3071 error_splat_bdi:
3072 deactivate_locked_super(s);
3073 nfs_free_fhandle(mntfh);
3074 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3075 return error;
3076 }
3077
3078 /*
3079 * Create an NFS4 server record on referral traversal
3080 */
3081 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3082 int flags, const char *dev_name, void *raw_data,
3083 struct vfsmount *mnt)
3084 {
3085 struct nfs_clone_mount *data = raw_data;
3086 char *export_path;
3087 struct vfsmount *root_mnt;
3088 int error;
3089
3090 dprintk("--> nfs4_referral_get_sb()\n");
3091
3092 export_path = data->mnt_path;
3093 data->mnt_path = "/";
3094
3095 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3096 flags, data, data->hostname);
3097 data->mnt_path = export_path;
3098
3099 error = PTR_ERR(root_mnt);
3100 if (IS_ERR(root_mnt))
3101 goto out;
3102
3103 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3104 out:
3105 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3106 error != 0 ? " [error]" : "");
3107 return error;
3108 }
3109
3110 #endif /* CONFIG_NFS_V4 */
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