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Merge branch 'kbuild/clean' into kbuild/kbuild
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/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 .clear_inode = nfs_clear_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 .clear_inode = nfs4_clear_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
435 nfs_free_fattr(res.fattr);
436 if (error < 0)
437 goto out_err;
438
439 buf->f_type = NFS_SUPER_MAGIC;
440
441 /*
442 * Current versions of glibc do not correctly handle the
443 * case where f_frsize != f_bsize. Eventually we want to
444 * report the value of wtmult in this field.
445 */
446 buf->f_frsize = dentry->d_sb->s_blocksize;
447
448 /*
449 * On most *nix systems, f_blocks, f_bfree, and f_bavail
450 * are reported in units of f_frsize. Linux hasn't had
451 * an f_frsize field in its statfs struct until recently,
452 * thus historically Linux's sys_statfs reports these
453 * fields in units of f_bsize.
454 */
455 buf->f_bsize = dentry->d_sb->s_blocksize;
456 blockbits = dentry->d_sb->s_blocksize_bits;
457 blockres = (1 << blockbits) - 1;
458 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
459 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
460 buf->f_bavail = (res.abytes + blockres) >> blockbits;
461
462 buf->f_files = res.tfiles;
463 buf->f_ffree = res.afiles;
464
465 buf->f_namelen = server->namelen;
466
467 return 0;
468
469 out_err:
470 dprintk("%s: statfs error = %d\n", __func__, -error);
471 return error;
472 }
473
474 /*
475 * Map the security flavour number to a name
476 */
477 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
478 {
479 static const struct {
480 rpc_authflavor_t flavour;
481 const char *str;
482 } sec_flavours[] = {
483 { RPC_AUTH_NULL, "null" },
484 { RPC_AUTH_UNIX, "sys" },
485 { RPC_AUTH_GSS_KRB5, "krb5" },
486 { RPC_AUTH_GSS_KRB5I, "krb5i" },
487 { RPC_AUTH_GSS_KRB5P, "krb5p" },
488 { RPC_AUTH_GSS_LKEY, "lkey" },
489 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
490 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
491 { RPC_AUTH_GSS_SPKM, "spkm" },
492 { RPC_AUTH_GSS_SPKMI, "spkmi" },
493 { RPC_AUTH_GSS_SPKMP, "spkmp" },
494 { UINT_MAX, "unknown" }
495 };
496 int i;
497
498 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
499 if (sec_flavours[i].flavour == flavour)
500 break;
501 }
502 return sec_flavours[i].str;
503 }
504
505 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
506 int showdefaults)
507 {
508 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
509
510 seq_printf(m, ",mountproto=");
511 switch (sap->sa_family) {
512 case AF_INET:
513 switch (nfss->mountd_protocol) {
514 case IPPROTO_UDP:
515 seq_printf(m, RPCBIND_NETID_UDP);
516 break;
517 case IPPROTO_TCP:
518 seq_printf(m, RPCBIND_NETID_TCP);
519 break;
520 default:
521 if (showdefaults)
522 seq_printf(m, "auto");
523 }
524 break;
525 case AF_INET6:
526 switch (nfss->mountd_protocol) {
527 case IPPROTO_UDP:
528 seq_printf(m, RPCBIND_NETID_UDP6);
529 break;
530 case IPPROTO_TCP:
531 seq_printf(m, RPCBIND_NETID_TCP6);
532 break;
533 default:
534 if (showdefaults)
535 seq_printf(m, "auto");
536 }
537 break;
538 default:
539 if (showdefaults)
540 seq_printf(m, "auto");
541 }
542 }
543
544 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
548
549 switch (sap->sa_family) {
550 case AF_INET: {
551 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
552 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
553 break;
554 }
555 case AF_INET6: {
556 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
557 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
558 break;
559 }
560 default:
561 if (showdefaults)
562 seq_printf(m, ",mountaddr=unspecified");
563 }
564
565 if (nfss->mountd_version || showdefaults)
566 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
567 if (nfss->mountd_port || showdefaults)
568 seq_printf(m, ",mountport=%u", nfss->mountd_port);
569
570 nfs_show_mountd_netid(m, nfss, showdefaults);
571 }
572
573 #ifdef CONFIG_NFS_V4
574 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
575 int showdefaults)
576 {
577 struct nfs_client *clp = nfss->nfs_client;
578
579 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
580 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
581 }
582 #else
583 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585 {
586 }
587 #endif
588
589 /*
590 * Describe the mount options in force on this server representation
591 */
592 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
593 int showdefaults)
594 {
595 static const struct proc_nfs_info {
596 int flag;
597 const char *str;
598 const char *nostr;
599 } nfs_info[] = {
600 { NFS_MOUNT_SOFT, ",soft", ",hard" },
601 { NFS_MOUNT_POSIX, ",posix", "" },
602 { NFS_MOUNT_NOCTO, ",nocto", "" },
603 { NFS_MOUNT_NOAC, ",noac", "" },
604 { NFS_MOUNT_NONLM, ",nolock", "" },
605 { NFS_MOUNT_NOACL, ",noacl", "" },
606 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
607 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
608 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
609 { 0, NULL, NULL }
610 };
611 const struct proc_nfs_info *nfs_infop;
612 struct nfs_client *clp = nfss->nfs_client;
613 u32 version = clp->rpc_ops->version;
614
615 seq_printf(m, ",vers=%u", version);
616 seq_printf(m, ",rsize=%u", nfss->rsize);
617 seq_printf(m, ",wsize=%u", nfss->wsize);
618 if (nfss->bsize != 0)
619 seq_printf(m, ",bsize=%u", nfss->bsize);
620 seq_printf(m, ",namlen=%u", nfss->namelen);
621 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
622 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
623 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
624 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
625 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
626 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
627 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
628 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
629 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
630 if (nfss->flags & nfs_infop->flag)
631 seq_puts(m, nfs_infop->str);
632 else
633 seq_puts(m, nfs_infop->nostr);
634 }
635 seq_printf(m, ",proto=%s",
636 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
637 if (version == 4) {
638 if (nfss->port != NFS_PORT)
639 seq_printf(m, ",port=%u", nfss->port);
640 } else
641 if (nfss->port)
642 seq_printf(m, ",port=%u", nfss->port);
643
644 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
645 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
646 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
647
648 if (version != 4)
649 nfs_show_mountd_options(m, nfss, showdefaults);
650 else
651 nfs_show_nfsv4_options(m, nfss, showdefaults);
652
653 if (nfss->options & NFS_OPTION_FSCACHE)
654 seq_printf(m, ",fsc");
655 }
656
657 /*
658 * Describe the mount options on this VFS mountpoint
659 */
660 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
661 {
662 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
663
664 nfs_show_mount_options(m, nfss, 0);
665
666 seq_printf(m, ",addr=%s",
667 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
668 RPC_DISPLAY_ADDR));
669
670 return 0;
671 }
672
673 /*
674 * Present statistical information for this VFS mountpoint
675 */
676 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
677 {
678 int i, cpu;
679 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
680 struct rpc_auth *auth = nfss->client->cl_auth;
681 struct nfs_iostats totals = { };
682
683 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
684
685 /*
686 * Display all mount option settings
687 */
688 seq_printf(m, "\n\topts:\t");
689 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
690 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
691 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
692 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
693 nfs_show_mount_options(m, nfss, 1);
694
695 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
696
697 seq_printf(m, "\n\tcaps:\t");
698 seq_printf(m, "caps=0x%x", nfss->caps);
699 seq_printf(m, ",wtmult=%u", nfss->wtmult);
700 seq_printf(m, ",dtsize=%u", nfss->dtsize);
701 seq_printf(m, ",bsize=%u", nfss->bsize);
702 seq_printf(m, ",namlen=%u", nfss->namelen);
703
704 #ifdef CONFIG_NFS_V4
705 if (nfss->nfs_client->rpc_ops->version == 4) {
706 seq_printf(m, "\n\tnfsv4:\t");
707 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
708 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
709 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
710 }
711 #endif
712
713 /*
714 * Display security flavor in effect for this mount
715 */
716 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
717 if (auth->au_flavor)
718 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
719
720 /*
721 * Display superblock I/O counters
722 */
723 for_each_possible_cpu(cpu) {
724 struct nfs_iostats *stats;
725
726 preempt_disable();
727 stats = per_cpu_ptr(nfss->io_stats, cpu);
728
729 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
730 totals.events[i] += stats->events[i];
731 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
732 totals.bytes[i] += stats->bytes[i];
733 #ifdef CONFIG_NFS_FSCACHE
734 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
735 totals.fscache[i] += stats->fscache[i];
736 #endif
737
738 preempt_enable();
739 }
740
741 seq_printf(m, "\n\tevents:\t");
742 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
743 seq_printf(m, "%lu ", totals.events[i]);
744 seq_printf(m, "\n\tbytes:\t");
745 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
746 seq_printf(m, "%Lu ", totals.bytes[i]);
747 #ifdef CONFIG_NFS_FSCACHE
748 if (nfss->options & NFS_OPTION_FSCACHE) {
749 seq_printf(m, "\n\tfsc:\t");
750 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
751 seq_printf(m, "%Lu ", totals.bytes[i]);
752 }
753 #endif
754 seq_printf(m, "\n");
755
756 rpc_print_iostats(m, nfss->client);
757
758 return 0;
759 }
760
761 /*
762 * Begin unmount by attempting to remove all automounted mountpoints we added
763 * in response to xdev traversals and referrals
764 */
765 static void nfs_umount_begin(struct super_block *sb)
766 {
767 struct nfs_server *server;
768 struct rpc_clnt *rpc;
769
770 server = NFS_SB(sb);
771 /* -EIO all pending I/O */
772 rpc = server->client_acl;
773 if (!IS_ERR(rpc))
774 rpc_killall_tasks(rpc);
775 rpc = server->client;
776 if (!IS_ERR(rpc))
777 rpc_killall_tasks(rpc);
778 }
779
780 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
781 {
782 struct nfs_parsed_mount_data *data;
783
784 data = kzalloc(sizeof(*data), GFP_KERNEL);
785 if (data) {
786 data->acregmin = NFS_DEF_ACREGMIN;
787 data->acregmax = NFS_DEF_ACREGMAX;
788 data->acdirmin = NFS_DEF_ACDIRMIN;
789 data->acdirmax = NFS_DEF_ACDIRMAX;
790 data->mount_server.port = NFS_UNSPEC_PORT;
791 data->nfs_server.port = NFS_UNSPEC_PORT;
792 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
793 data->auth_flavors[0] = RPC_AUTH_UNIX;
794 data->auth_flavor_len = 1;
795 data->version = version;
796 data->minorversion = 0;
797 }
798 return data;
799 }
800
801 /*
802 * Sanity-check a server address provided by the mount command.
803 *
804 * Address family must be initialized, and address must not be
805 * the ANY address for that family.
806 */
807 static int nfs_verify_server_address(struct sockaddr *addr)
808 {
809 switch (addr->sa_family) {
810 case AF_INET: {
811 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
812 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
813 }
814 case AF_INET6: {
815 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
816 return !ipv6_addr_any(sa);
817 }
818 }
819
820 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
821 return 0;
822 }
823
824 /*
825 * Select between a default port value and a user-specified port value.
826 * If a zero value is set, then autobind will be used.
827 */
828 static void nfs_set_port(struct sockaddr *sap, int *port,
829 const unsigned short default_port)
830 {
831 if (*port == NFS_UNSPEC_PORT)
832 *port = default_port;
833
834 rpc_set_port(sap, *port);
835 }
836
837 /*
838 * Sanity check the NFS transport protocol.
839 *
840 */
841 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
842 {
843 switch (mnt->nfs_server.protocol) {
844 case XPRT_TRANSPORT_UDP:
845 case XPRT_TRANSPORT_TCP:
846 case XPRT_TRANSPORT_RDMA:
847 break;
848 default:
849 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
850 }
851 }
852
853 /*
854 * For text based NFSv2/v3 mounts, the mount protocol transport default
855 * settings should depend upon the specified NFS transport.
856 */
857 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
858 {
859 nfs_validate_transport_protocol(mnt);
860
861 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
862 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
863 return;
864 switch (mnt->nfs_server.protocol) {
865 case XPRT_TRANSPORT_UDP:
866 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
867 break;
868 case XPRT_TRANSPORT_TCP:
869 case XPRT_TRANSPORT_RDMA:
870 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
871 }
872 }
873
874 /*
875 * Parse the value of the 'sec=' option.
876 */
877 static int nfs_parse_security_flavors(char *value,
878 struct nfs_parsed_mount_data *mnt)
879 {
880 substring_t args[MAX_OPT_ARGS];
881
882 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
883
884 switch (match_token(value, nfs_secflavor_tokens, args)) {
885 case Opt_sec_none:
886 mnt->auth_flavors[0] = RPC_AUTH_NULL;
887 break;
888 case Opt_sec_sys:
889 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
890 break;
891 case Opt_sec_krb5:
892 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
893 break;
894 case Opt_sec_krb5i:
895 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
896 break;
897 case Opt_sec_krb5p:
898 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
899 break;
900 case Opt_sec_lkey:
901 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
902 break;
903 case Opt_sec_lkeyi:
904 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
905 break;
906 case Opt_sec_lkeyp:
907 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
908 break;
909 case Opt_sec_spkm:
910 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
911 break;
912 case Opt_sec_spkmi:
913 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
914 break;
915 case Opt_sec_spkmp:
916 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
917 break;
918 default:
919 return 0;
920 }
921
922 mnt->auth_flavor_len = 1;
923 return 1;
924 }
925
926 /*
927 * Error-check and convert a string of mount options from user space into
928 * a data structure. The whole mount string is processed; bad options are
929 * skipped as they are encountered. If there were no errors, return 1;
930 * otherwise return 0 (zero).
931 */
932 static int nfs_parse_mount_options(char *raw,
933 struct nfs_parsed_mount_data *mnt)
934 {
935 char *p, *string, *secdata;
936 int rc, sloppy = 0, invalid_option = 0;
937 unsigned short protofamily = AF_UNSPEC;
938 unsigned short mountfamily = AF_UNSPEC;
939
940 if (!raw) {
941 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
942 return 1;
943 }
944 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
945
946 secdata = alloc_secdata();
947 if (!secdata)
948 goto out_nomem;
949
950 rc = security_sb_copy_data(raw, secdata);
951 if (rc)
952 goto out_security_failure;
953
954 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
955 if (rc)
956 goto out_security_failure;
957
958 free_secdata(secdata);
959
960 while ((p = strsep(&raw, ",")) != NULL) {
961 substring_t args[MAX_OPT_ARGS];
962 unsigned long option;
963 int token;
964
965 if (!*p)
966 continue;
967
968 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
969
970 token = match_token(p, nfs_mount_option_tokens, args);
971 switch (token) {
972
973 /*
974 * boolean options: foo/nofoo
975 */
976 case Opt_soft:
977 mnt->flags |= NFS_MOUNT_SOFT;
978 break;
979 case Opt_hard:
980 mnt->flags &= ~NFS_MOUNT_SOFT;
981 break;
982 case Opt_posix:
983 mnt->flags |= NFS_MOUNT_POSIX;
984 break;
985 case Opt_noposix:
986 mnt->flags &= ~NFS_MOUNT_POSIX;
987 break;
988 case Opt_cto:
989 mnt->flags &= ~NFS_MOUNT_NOCTO;
990 break;
991 case Opt_nocto:
992 mnt->flags |= NFS_MOUNT_NOCTO;
993 break;
994 case Opt_ac:
995 mnt->flags &= ~NFS_MOUNT_NOAC;
996 break;
997 case Opt_noac:
998 mnt->flags |= NFS_MOUNT_NOAC;
999 break;
1000 case Opt_lock:
1001 mnt->flags &= ~NFS_MOUNT_NONLM;
1002 break;
1003 case Opt_nolock:
1004 mnt->flags |= NFS_MOUNT_NONLM;
1005 break;
1006 case Opt_v2:
1007 mnt->flags &= ~NFS_MOUNT_VER3;
1008 mnt->version = 2;
1009 break;
1010 case Opt_v3:
1011 mnt->flags |= NFS_MOUNT_VER3;
1012 mnt->version = 3;
1013 break;
1014 #ifdef CONFIG_NFS_V4
1015 case Opt_v4:
1016 mnt->flags &= ~NFS_MOUNT_VER3;
1017 mnt->version = 4;
1018 break;
1019 #endif
1020 case Opt_udp:
1021 mnt->flags &= ~NFS_MOUNT_TCP;
1022 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1023 break;
1024 case Opt_tcp:
1025 mnt->flags |= NFS_MOUNT_TCP;
1026 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1027 break;
1028 case Opt_rdma:
1029 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1030 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1031 xprt_load_transport(p);
1032 break;
1033 case Opt_acl:
1034 mnt->flags &= ~NFS_MOUNT_NOACL;
1035 break;
1036 case Opt_noacl:
1037 mnt->flags |= NFS_MOUNT_NOACL;
1038 break;
1039 case Opt_rdirplus:
1040 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1041 break;
1042 case Opt_nordirplus:
1043 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1044 break;
1045 case Opt_sharecache:
1046 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1047 break;
1048 case Opt_nosharecache:
1049 mnt->flags |= NFS_MOUNT_UNSHARED;
1050 break;
1051 case Opt_resvport:
1052 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1053 break;
1054 case Opt_noresvport:
1055 mnt->flags |= NFS_MOUNT_NORESVPORT;
1056 break;
1057 case Opt_fscache:
1058 mnt->options |= NFS_OPTION_FSCACHE;
1059 kfree(mnt->fscache_uniq);
1060 mnt->fscache_uniq = NULL;
1061 break;
1062 case Opt_nofscache:
1063 mnt->options &= ~NFS_OPTION_FSCACHE;
1064 kfree(mnt->fscache_uniq);
1065 mnt->fscache_uniq = NULL;
1066 break;
1067
1068 /*
1069 * options that take numeric values
1070 */
1071 case Opt_port:
1072 string = match_strdup(args);
1073 if (string == NULL)
1074 goto out_nomem;
1075 rc = strict_strtoul(string, 10, &option);
1076 kfree(string);
1077 if (rc != 0 || option > USHRT_MAX)
1078 goto out_invalid_value;
1079 mnt->nfs_server.port = option;
1080 break;
1081 case Opt_rsize:
1082 string = match_strdup(args);
1083 if (string == NULL)
1084 goto out_nomem;
1085 rc = strict_strtoul(string, 10, &option);
1086 kfree(string);
1087 if (rc != 0)
1088 goto out_invalid_value;
1089 mnt->rsize = option;
1090 break;
1091 case Opt_wsize:
1092 string = match_strdup(args);
1093 if (string == NULL)
1094 goto out_nomem;
1095 rc = strict_strtoul(string, 10, &option);
1096 kfree(string);
1097 if (rc != 0)
1098 goto out_invalid_value;
1099 mnt->wsize = option;
1100 break;
1101 case Opt_bsize:
1102 string = match_strdup(args);
1103 if (string == NULL)
1104 goto out_nomem;
1105 rc = strict_strtoul(string, 10, &option);
1106 kfree(string);
1107 if (rc != 0)
1108 goto out_invalid_value;
1109 mnt->bsize = option;
1110 break;
1111 case Opt_timeo:
1112 string = match_strdup(args);
1113 if (string == NULL)
1114 goto out_nomem;
1115 rc = strict_strtoul(string, 10, &option);
1116 kfree(string);
1117 if (rc != 0 || option == 0)
1118 goto out_invalid_value;
1119 mnt->timeo = option;
1120 break;
1121 case Opt_retrans:
1122 string = match_strdup(args);
1123 if (string == NULL)
1124 goto out_nomem;
1125 rc = strict_strtoul(string, 10, &option);
1126 kfree(string);
1127 if (rc != 0 || option == 0)
1128 goto out_invalid_value;
1129 mnt->retrans = option;
1130 break;
1131 case Opt_acregmin:
1132 string = match_strdup(args);
1133 if (string == NULL)
1134 goto out_nomem;
1135 rc = strict_strtoul(string, 10, &option);
1136 kfree(string);
1137 if (rc != 0)
1138 goto out_invalid_value;
1139 mnt->acregmin = option;
1140 break;
1141 case Opt_acregmax:
1142 string = match_strdup(args);
1143 if (string == NULL)
1144 goto out_nomem;
1145 rc = strict_strtoul(string, 10, &option);
1146 kfree(string);
1147 if (rc != 0)
1148 goto out_invalid_value;
1149 mnt->acregmax = option;
1150 break;
1151 case Opt_acdirmin:
1152 string = match_strdup(args);
1153 if (string == NULL)
1154 goto out_nomem;
1155 rc = strict_strtoul(string, 10, &option);
1156 kfree(string);
1157 if (rc != 0)
1158 goto out_invalid_value;
1159 mnt->acdirmin = option;
1160 break;
1161 case Opt_acdirmax:
1162 string = match_strdup(args);
1163 if (string == NULL)
1164 goto out_nomem;
1165 rc = strict_strtoul(string, 10, &option);
1166 kfree(string);
1167 if (rc != 0)
1168 goto out_invalid_value;
1169 mnt->acdirmax = option;
1170 break;
1171 case Opt_actimeo:
1172 string = match_strdup(args);
1173 if (string == NULL)
1174 goto out_nomem;
1175 rc = strict_strtoul(string, 10, &option);
1176 kfree(string);
1177 if (rc != 0)
1178 goto out_invalid_value;
1179 mnt->acregmin = mnt->acregmax =
1180 mnt->acdirmin = mnt->acdirmax = option;
1181 break;
1182 case Opt_namelen:
1183 string = match_strdup(args);
1184 if (string == NULL)
1185 goto out_nomem;
1186 rc = strict_strtoul(string, 10, &option);
1187 kfree(string);
1188 if (rc != 0)
1189 goto out_invalid_value;
1190 mnt->namlen = option;
1191 break;
1192 case Opt_mountport:
1193 string = match_strdup(args);
1194 if (string == NULL)
1195 goto out_nomem;
1196 rc = strict_strtoul(string, 10, &option);
1197 kfree(string);
1198 if (rc != 0 || option > USHRT_MAX)
1199 goto out_invalid_value;
1200 mnt->mount_server.port = option;
1201 break;
1202 case Opt_mountvers:
1203 string = match_strdup(args);
1204 if (string == NULL)
1205 goto out_nomem;
1206 rc = strict_strtoul(string, 10, &option);
1207 kfree(string);
1208 if (rc != 0 ||
1209 option < NFS_MNT_VERSION ||
1210 option > NFS_MNT3_VERSION)
1211 goto out_invalid_value;
1212 mnt->mount_server.version = option;
1213 break;
1214 case Opt_nfsvers:
1215 string = match_strdup(args);
1216 if (string == NULL)
1217 goto out_nomem;
1218 rc = strict_strtoul(string, 10, &option);
1219 kfree(string);
1220 if (rc != 0)
1221 goto out_invalid_value;
1222 switch (option) {
1223 case NFS2_VERSION:
1224 mnt->flags &= ~NFS_MOUNT_VER3;
1225 mnt->version = 2;
1226 break;
1227 case NFS3_VERSION:
1228 mnt->flags |= NFS_MOUNT_VER3;
1229 mnt->version = 3;
1230 break;
1231 #ifdef CONFIG_NFS_V4
1232 case NFS4_VERSION:
1233 mnt->flags &= ~NFS_MOUNT_VER3;
1234 mnt->version = 4;
1235 break;
1236 #endif
1237 default:
1238 goto out_invalid_value;
1239 }
1240 break;
1241 case Opt_minorversion:
1242 string = match_strdup(args);
1243 if (string == NULL)
1244 goto out_nomem;
1245 rc = strict_strtoul(string, 10, &option);
1246 kfree(string);
1247 if (rc != 0)
1248 goto out_invalid_value;
1249 if (option > NFS4_MAX_MINOR_VERSION)
1250 goto out_invalid_value;
1251 mnt->minorversion = option;
1252 break;
1253
1254 /*
1255 * options that take text values
1256 */
1257 case Opt_sec:
1258 string = match_strdup(args);
1259 if (string == NULL)
1260 goto out_nomem;
1261 rc = nfs_parse_security_flavors(string, mnt);
1262 kfree(string);
1263 if (!rc) {
1264 dfprintk(MOUNT, "NFS: unrecognized "
1265 "security flavor\n");
1266 return 0;
1267 }
1268 break;
1269 case Opt_proto:
1270 string = match_strdup(args);
1271 if (string == NULL)
1272 goto out_nomem;
1273 token = match_token(string,
1274 nfs_xprt_protocol_tokens, args);
1275
1276 protofamily = AF_INET;
1277 switch (token) {
1278 case Opt_xprt_udp6:
1279 protofamily = AF_INET6;
1280 case Opt_xprt_udp:
1281 mnt->flags &= ~NFS_MOUNT_TCP;
1282 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1283 kfree(string);
1284 break;
1285 case Opt_xprt_tcp6:
1286 protofamily = AF_INET6;
1287 case Opt_xprt_tcp:
1288 mnt->flags |= NFS_MOUNT_TCP;
1289 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1290 kfree(string);
1291 break;
1292 case Opt_xprt_rdma:
1293 /* vector side protocols to TCP */
1294 mnt->flags |= NFS_MOUNT_TCP;
1295 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1296 xprt_load_transport(string);
1297 kfree(string);
1298 break;
1299 default:
1300 dfprintk(MOUNT, "NFS: unrecognized "
1301 "transport protocol\n");
1302 kfree(string);
1303 return 0;
1304 }
1305 break;
1306 case Opt_mountproto:
1307 string = match_strdup(args);
1308 if (string == NULL)
1309 goto out_nomem;
1310 token = match_token(string,
1311 nfs_xprt_protocol_tokens, args);
1312 kfree(string);
1313
1314 mountfamily = AF_INET;
1315 switch (token) {
1316 case Opt_xprt_udp6:
1317 mountfamily = AF_INET6;
1318 case Opt_xprt_udp:
1319 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1320 break;
1321 case Opt_xprt_tcp6:
1322 mountfamily = AF_INET6;
1323 case Opt_xprt_tcp:
1324 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1325 break;
1326 case Opt_xprt_rdma: /* not used for side protocols */
1327 default:
1328 dfprintk(MOUNT, "NFS: unrecognized "
1329 "transport protocol\n");
1330 return 0;
1331 }
1332 break;
1333 case Opt_addr:
1334 string = match_strdup(args);
1335 if (string == NULL)
1336 goto out_nomem;
1337 mnt->nfs_server.addrlen =
1338 rpc_pton(string, strlen(string),
1339 (struct sockaddr *)
1340 &mnt->nfs_server.address,
1341 sizeof(mnt->nfs_server.address));
1342 kfree(string);
1343 if (mnt->nfs_server.addrlen == 0)
1344 goto out_invalid_address;
1345 break;
1346 case Opt_clientaddr:
1347 string = match_strdup(args);
1348 if (string == NULL)
1349 goto out_nomem;
1350 kfree(mnt->client_address);
1351 mnt->client_address = string;
1352 break;
1353 case Opt_mounthost:
1354 string = match_strdup(args);
1355 if (string == NULL)
1356 goto out_nomem;
1357 kfree(mnt->mount_server.hostname);
1358 mnt->mount_server.hostname = string;
1359 break;
1360 case Opt_mountaddr:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
1364 mnt->mount_server.addrlen =
1365 rpc_pton(string, strlen(string),
1366 (struct sockaddr *)
1367 &mnt->mount_server.address,
1368 sizeof(mnt->mount_server.address));
1369 kfree(string);
1370 if (mnt->mount_server.addrlen == 0)
1371 goto out_invalid_address;
1372 break;
1373 case Opt_lookupcache:
1374 string = match_strdup(args);
1375 if (string == NULL)
1376 goto out_nomem;
1377 token = match_token(string,
1378 nfs_lookupcache_tokens, args);
1379 kfree(string);
1380 switch (token) {
1381 case Opt_lookupcache_all:
1382 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1383 break;
1384 case Opt_lookupcache_positive:
1385 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1386 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1387 break;
1388 case Opt_lookupcache_none:
1389 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1390 break;
1391 default:
1392 dfprintk(MOUNT, "NFS: invalid "
1393 "lookupcache argument\n");
1394 return 0;
1395 };
1396 break;
1397 case Opt_fscache_uniq:
1398 string = match_strdup(args);
1399 if (string == NULL)
1400 goto out_nomem;
1401 kfree(mnt->fscache_uniq);
1402 mnt->fscache_uniq = string;
1403 mnt->options |= NFS_OPTION_FSCACHE;
1404 break;
1405
1406 /*
1407 * Special options
1408 */
1409 case Opt_sloppy:
1410 sloppy = 1;
1411 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1412 break;
1413 case Opt_userspace:
1414 case Opt_deprecated:
1415 dfprintk(MOUNT, "NFS: ignoring mount option "
1416 "'%s'\n", p);
1417 break;
1418
1419 default:
1420 invalid_option = 1;
1421 dfprintk(MOUNT, "NFS: unrecognized mount option "
1422 "'%s'\n", p);
1423 }
1424 }
1425
1426 if (!sloppy && invalid_option)
1427 return 0;
1428
1429 /*
1430 * verify that any proto=/mountproto= options match the address
1431 * familiies in the addr=/mountaddr= options.
1432 */
1433 if (protofamily != AF_UNSPEC &&
1434 protofamily != mnt->nfs_server.address.ss_family)
1435 goto out_proto_mismatch;
1436
1437 if (mountfamily != AF_UNSPEC) {
1438 if (mnt->mount_server.addrlen) {
1439 if (mountfamily != mnt->mount_server.address.ss_family)
1440 goto out_mountproto_mismatch;
1441 } else {
1442 if (mountfamily != mnt->nfs_server.address.ss_family)
1443 goto out_mountproto_mismatch;
1444 }
1445 }
1446
1447 return 1;
1448
1449 out_mountproto_mismatch:
1450 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1451 "option\n");
1452 return 0;
1453 out_proto_mismatch:
1454 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1455 return 0;
1456 out_invalid_address:
1457 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1458 return 0;
1459 out_invalid_value:
1460 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1461 return 0;
1462 out_nomem:
1463 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1464 return 0;
1465 out_security_failure:
1466 free_secdata(secdata);
1467 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1468 return 0;
1469 }
1470
1471 /*
1472 * Match the requested auth flavors with the list returned by
1473 * the server. Returns zero and sets the mount's authentication
1474 * flavor on success; returns -EACCES if server does not support
1475 * the requested flavor.
1476 */
1477 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1478 struct nfs_mount_request *request)
1479 {
1480 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1481
1482 /*
1483 * Certain releases of Linux's mountd return an empty
1484 * flavor list. To prevent behavioral regression with
1485 * these servers (ie. rejecting mounts that used to
1486 * succeed), revert to pre-2.6.32 behavior (no checking)
1487 * if the returned flavor list is empty.
1488 */
1489 if (server_authlist_len == 0)
1490 return 0;
1491
1492 /*
1493 * We avoid sophisticated negotiating here, as there are
1494 * plenty of cases where we can get it wrong, providing
1495 * either too little or too much security.
1496 *
1497 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1498 * flavor listed first. However, some servers list
1499 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1500 * preferred default, in args->auth_flavors[0] if user
1501 * didn't specify sec= mount option.
1502 */
1503 for (i = 0; i < args->auth_flavor_len; i++)
1504 for (j = 0; j < server_authlist_len; j++)
1505 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1506 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1507 request->auth_flavs[j]);
1508 args->auth_flavors[0] = request->auth_flavs[j];
1509 return 0;
1510 }
1511
1512 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1513 nfs_umount(request);
1514 return -EACCES;
1515 }
1516
1517 /*
1518 * Use the remote server's MOUNT service to request the NFS file handle
1519 * corresponding to the provided path.
1520 */
1521 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1522 struct nfs_fh *root_fh)
1523 {
1524 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1525 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1526 struct nfs_mount_request request = {
1527 .sap = (struct sockaddr *)
1528 &args->mount_server.address,
1529 .dirpath = args->nfs_server.export_path,
1530 .protocol = args->mount_server.protocol,
1531 .fh = root_fh,
1532 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1533 .auth_flav_len = &server_authlist_len,
1534 .auth_flavs = server_authlist,
1535 };
1536 int status;
1537
1538 if (args->mount_server.version == 0) {
1539 switch (args->version) {
1540 default:
1541 args->mount_server.version = NFS_MNT3_VERSION;
1542 break;
1543 case 2:
1544 args->mount_server.version = NFS_MNT_VERSION;
1545 }
1546 }
1547 request.version = args->mount_server.version;
1548
1549 if (args->mount_server.hostname)
1550 request.hostname = args->mount_server.hostname;
1551 else
1552 request.hostname = args->nfs_server.hostname;
1553
1554 /*
1555 * Construct the mount server's address.
1556 */
1557 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1558 memcpy(request.sap, &args->nfs_server.address,
1559 args->nfs_server.addrlen);
1560 args->mount_server.addrlen = args->nfs_server.addrlen;
1561 }
1562 request.salen = args->mount_server.addrlen;
1563 nfs_set_port(request.sap, &args->mount_server.port, 0);
1564
1565 /*
1566 * Now ask the mount server to map our export path
1567 * to a file handle.
1568 */
1569 status = nfs_mount(&request);
1570 if (status != 0) {
1571 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1572 request.hostname, status);
1573 return status;
1574 }
1575
1576 /*
1577 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1578 */
1579 if (args->mount_server.version != NFS_MNT3_VERSION)
1580 return 0;
1581 return nfs_walk_authlist(args, &request);
1582 }
1583
1584 static int nfs_parse_simple_hostname(const char *dev_name,
1585 char **hostname, size_t maxnamlen,
1586 char **export_path, size_t maxpathlen)
1587 {
1588 size_t len;
1589 char *colon, *comma;
1590
1591 colon = strchr(dev_name, ':');
1592 if (colon == NULL)
1593 goto out_bad_devname;
1594
1595 len = colon - dev_name;
1596 if (len > maxnamlen)
1597 goto out_hostname;
1598
1599 /* N.B. caller will free nfs_server.hostname in all cases */
1600 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1601 if (!*hostname)
1602 goto out_nomem;
1603
1604 /* kill possible hostname list: not supported */
1605 comma = strchr(*hostname, ',');
1606 if (comma != NULL) {
1607 if (comma == *hostname)
1608 goto out_bad_devname;
1609 *comma = '\0';
1610 }
1611
1612 colon++;
1613 len = strlen(colon);
1614 if (len > maxpathlen)
1615 goto out_path;
1616 *export_path = kstrndup(colon, len, GFP_KERNEL);
1617 if (!*export_path)
1618 goto out_nomem;
1619
1620 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1621 return 0;
1622
1623 out_bad_devname:
1624 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1625 return -EINVAL;
1626
1627 out_nomem:
1628 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1629 return -ENOMEM;
1630
1631 out_hostname:
1632 dfprintk(MOUNT, "NFS: server hostname too long\n");
1633 return -ENAMETOOLONG;
1634
1635 out_path:
1636 dfprintk(MOUNT, "NFS: export pathname too long\n");
1637 return -ENAMETOOLONG;
1638 }
1639
1640 /*
1641 * Hostname has square brackets around it because it contains one or
1642 * more colons. We look for the first closing square bracket, and a
1643 * colon must follow it.
1644 */
1645 static int nfs_parse_protected_hostname(const char *dev_name,
1646 char **hostname, size_t maxnamlen,
1647 char **export_path, size_t maxpathlen)
1648 {
1649 size_t len;
1650 char *start, *end;
1651
1652 start = (char *)(dev_name + 1);
1653
1654 end = strchr(start, ']');
1655 if (end == NULL)
1656 goto out_bad_devname;
1657 if (*(end + 1) != ':')
1658 goto out_bad_devname;
1659
1660 len = end - start;
1661 if (len > maxnamlen)
1662 goto out_hostname;
1663
1664 /* N.B. caller will free nfs_server.hostname in all cases */
1665 *hostname = kstrndup(start, len, GFP_KERNEL);
1666 if (*hostname == NULL)
1667 goto out_nomem;
1668
1669 end += 2;
1670 len = strlen(end);
1671 if (len > maxpathlen)
1672 goto out_path;
1673 *export_path = kstrndup(end, len, GFP_KERNEL);
1674 if (!*export_path)
1675 goto out_nomem;
1676
1677 return 0;
1678
1679 out_bad_devname:
1680 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1681 return -EINVAL;
1682
1683 out_nomem:
1684 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1685 return -ENOMEM;
1686
1687 out_hostname:
1688 dfprintk(MOUNT, "NFS: server hostname too long\n");
1689 return -ENAMETOOLONG;
1690
1691 out_path:
1692 dfprintk(MOUNT, "NFS: export pathname too long\n");
1693 return -ENAMETOOLONG;
1694 }
1695
1696 /*
1697 * Split "dev_name" into "hostname:export_path".
1698 *
1699 * The leftmost colon demarks the split between the server's hostname
1700 * and the export path. If the hostname starts with a left square
1701 * bracket, then it may contain colons.
1702 *
1703 * Note: caller frees hostname and export path, even on error.
1704 */
1705 static int nfs_parse_devname(const char *dev_name,
1706 char **hostname, size_t maxnamlen,
1707 char **export_path, size_t maxpathlen)
1708 {
1709 if (*dev_name == '[')
1710 return nfs_parse_protected_hostname(dev_name,
1711 hostname, maxnamlen,
1712 export_path, maxpathlen);
1713
1714 return nfs_parse_simple_hostname(dev_name,
1715 hostname, maxnamlen,
1716 export_path, maxpathlen);
1717 }
1718
1719 /*
1720 * Validate the NFS2/NFS3 mount data
1721 * - fills in the mount root filehandle
1722 *
1723 * For option strings, user space handles the following behaviors:
1724 *
1725 * + DNS: mapping server host name to IP address ("addr=" option)
1726 *
1727 * + failure mode: how to behave if a mount request can't be handled
1728 * immediately ("fg/bg" option)
1729 *
1730 * + retry: how often to retry a mount request ("retry=" option)
1731 *
1732 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1733 * mountproto=tcp after mountproto=udp, and so on
1734 */
1735 static int nfs_validate_mount_data(void *options,
1736 struct nfs_parsed_mount_data *args,
1737 struct nfs_fh *mntfh,
1738 const char *dev_name)
1739 {
1740 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1741 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1742
1743 if (data == NULL)
1744 goto out_no_data;
1745
1746 switch (data->version) {
1747 case 1:
1748 data->namlen = 0;
1749 case 2:
1750 data->bsize = 0;
1751 case 3:
1752 if (data->flags & NFS_MOUNT_VER3)
1753 goto out_no_v3;
1754 data->root.size = NFS2_FHSIZE;
1755 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1756 case 4:
1757 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1758 goto out_no_sec;
1759 case 5:
1760 memset(data->context, 0, sizeof(data->context));
1761 case 6:
1762 if (data->flags & NFS_MOUNT_VER3) {
1763 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1764 goto out_invalid_fh;
1765 mntfh->size = data->root.size;
1766 args->version = 3;
1767 } else {
1768 mntfh->size = NFS2_FHSIZE;
1769 args->version = 2;
1770 }
1771
1772
1773 memcpy(mntfh->data, data->root.data, mntfh->size);
1774 if (mntfh->size < sizeof(mntfh->data))
1775 memset(mntfh->data + mntfh->size, 0,
1776 sizeof(mntfh->data) - mntfh->size);
1777
1778 /*
1779 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1780 * can deal with.
1781 */
1782 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1783 args->rsize = data->rsize;
1784 args->wsize = data->wsize;
1785 args->timeo = data->timeo;
1786 args->retrans = data->retrans;
1787 args->acregmin = data->acregmin;
1788 args->acregmax = data->acregmax;
1789 args->acdirmin = data->acdirmin;
1790 args->acdirmax = data->acdirmax;
1791
1792 memcpy(sap, &data->addr, sizeof(data->addr));
1793 args->nfs_server.addrlen = sizeof(data->addr);
1794 if (!nfs_verify_server_address(sap))
1795 goto out_no_address;
1796
1797 if (!(data->flags & NFS_MOUNT_TCP))
1798 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1799 /* N.B. caller will free nfs_server.hostname in all cases */
1800 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1801 args->namlen = data->namlen;
1802 args->bsize = data->bsize;
1803
1804 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1805 args->auth_flavors[0] = data->pseudoflavor;
1806 if (!args->nfs_server.hostname)
1807 goto out_nomem;
1808
1809 /*
1810 * The legacy version 6 binary mount data from userspace has a
1811 * field used only to transport selinux information into the
1812 * the kernel. To continue to support that functionality we
1813 * have a touch of selinux knowledge here in the NFS code. The
1814 * userspace code converted context=blah to just blah so we are
1815 * converting back to the full string selinux understands.
1816 */
1817 if (data->context[0]){
1818 #ifdef CONFIG_SECURITY_SELINUX
1819 int rc;
1820 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1821 if (!opts_str)
1822 return -ENOMEM;
1823 strcpy(opts_str, "context=");
1824 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1825 strcat(opts_str, &data->context[0]);
1826 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1827 kfree(opts_str);
1828 if (rc)
1829 return rc;
1830 #else
1831 return -EINVAL;
1832 #endif
1833 }
1834
1835 break;
1836 default: {
1837 int status;
1838
1839 if (nfs_parse_mount_options((char *)options, args) == 0)
1840 return -EINVAL;
1841
1842 if (!nfs_verify_server_address(sap))
1843 goto out_no_address;
1844
1845 if (args->version == 4)
1846 #ifdef CONFIG_NFS_V4
1847 return nfs4_validate_text_mount_data(options,
1848 args, dev_name);
1849 #else
1850 goto out_v4_not_compiled;
1851 #endif
1852
1853 nfs_set_port(sap, &args->nfs_server.port, 0);
1854
1855 nfs_set_mount_transport_protocol(args);
1856
1857 status = nfs_parse_devname(dev_name,
1858 &args->nfs_server.hostname,
1859 PAGE_SIZE,
1860 &args->nfs_server.export_path,
1861 NFS_MAXPATHLEN);
1862 if (!status)
1863 status = nfs_try_mount(args, mntfh);
1864
1865 kfree(args->nfs_server.export_path);
1866 args->nfs_server.export_path = NULL;
1867
1868 if (status)
1869 return status;
1870
1871 break;
1872 }
1873 }
1874
1875 #ifndef CONFIG_NFS_V3
1876 if (args->version == 3)
1877 goto out_v3_not_compiled;
1878 #endif /* !CONFIG_NFS_V3 */
1879
1880 return 0;
1881
1882 out_no_data:
1883 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1884 return -EINVAL;
1885
1886 out_no_v3:
1887 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1888 data->version);
1889 return -EINVAL;
1890
1891 out_no_sec:
1892 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1893 return -EINVAL;
1894
1895 #ifndef CONFIG_NFS_V3
1896 out_v3_not_compiled:
1897 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1898 return -EPROTONOSUPPORT;
1899 #endif /* !CONFIG_NFS_V3 */
1900
1901 #ifndef CONFIG_NFS_V4
1902 out_v4_not_compiled:
1903 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1904 return -EPROTONOSUPPORT;
1905 #endif /* !CONFIG_NFS_V4 */
1906
1907 out_nomem:
1908 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1909 return -ENOMEM;
1910
1911 out_no_address:
1912 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1913 return -EINVAL;
1914
1915 out_invalid_fh:
1916 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1917 return -EINVAL;
1918 }
1919
1920 static int
1921 nfs_compare_remount_data(struct nfs_server *nfss,
1922 struct nfs_parsed_mount_data *data)
1923 {
1924 if (data->flags != nfss->flags ||
1925 data->rsize != nfss->rsize ||
1926 data->wsize != nfss->wsize ||
1927 data->retrans != nfss->client->cl_timeout->to_retries ||
1928 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1929 data->acregmin != nfss->acregmin / HZ ||
1930 data->acregmax != nfss->acregmax / HZ ||
1931 data->acdirmin != nfss->acdirmin / HZ ||
1932 data->acdirmax != nfss->acdirmax / HZ ||
1933 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1934 data->nfs_server.port != nfss->port ||
1935 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1936 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1937 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1938 return -EINVAL;
1939
1940 return 0;
1941 }
1942
1943 static int
1944 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1945 {
1946 int error;
1947 struct nfs_server *nfss = sb->s_fs_info;
1948 struct nfs_parsed_mount_data *data;
1949 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1950 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1951 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1952
1953 /*
1954 * Userspace mount programs that send binary options generally send
1955 * them populated with default values. We have no way to know which
1956 * ones were explicitly specified. Fall back to legacy behavior and
1957 * just return success.
1958 */
1959 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1960 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1961 options->version <= 6))))
1962 return 0;
1963
1964 data = kzalloc(sizeof(*data), GFP_KERNEL);
1965 if (data == NULL)
1966 return -ENOMEM;
1967
1968 /* fill out struct with values from existing mount */
1969 data->flags = nfss->flags;
1970 data->rsize = nfss->rsize;
1971 data->wsize = nfss->wsize;
1972 data->retrans = nfss->client->cl_timeout->to_retries;
1973 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1974 data->acregmin = nfss->acregmin / HZ;
1975 data->acregmax = nfss->acregmax / HZ;
1976 data->acdirmin = nfss->acdirmin / HZ;
1977 data->acdirmax = nfss->acdirmax / HZ;
1978 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1979 data->nfs_server.port = nfss->port;
1980 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1981 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1982 data->nfs_server.addrlen);
1983
1984 /* overwrite those values with any that were specified */
1985 error = nfs_parse_mount_options((char *)options, data);
1986 if (error < 0)
1987 goto out;
1988
1989 /* compare new mount options with old ones */
1990 error = nfs_compare_remount_data(nfss, data);
1991 out:
1992 kfree(data);
1993 return error;
1994 }
1995
1996 /*
1997 * Initialise the common bits of the superblock
1998 */
1999 static inline void nfs_initialise_sb(struct super_block *sb)
2000 {
2001 struct nfs_server *server = NFS_SB(sb);
2002
2003 sb->s_magic = NFS_SUPER_MAGIC;
2004
2005 /* We probably want something more informative here */
2006 snprintf(sb->s_id, sizeof(sb->s_id),
2007 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2008
2009 if (sb->s_blocksize == 0)
2010 sb->s_blocksize = nfs_block_bits(server->wsize,
2011 &sb->s_blocksize_bits);
2012
2013 if (server->flags & NFS_MOUNT_NOAC)
2014 sb->s_flags |= MS_SYNCHRONOUS;
2015
2016 sb->s_bdi = &server->backing_dev_info;
2017
2018 nfs_super_set_maxbytes(sb, server->maxfilesize);
2019 }
2020
2021 /*
2022 * Finish setting up an NFS2/3 superblock
2023 */
2024 static void nfs_fill_super(struct super_block *sb,
2025 struct nfs_parsed_mount_data *data)
2026 {
2027 struct nfs_server *server = NFS_SB(sb);
2028
2029 sb->s_blocksize_bits = 0;
2030 sb->s_blocksize = 0;
2031 if (data->bsize)
2032 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2033
2034 if (server->nfs_client->rpc_ops->version == 3) {
2035 /* The VFS shouldn't apply the umask to mode bits. We will do
2036 * so ourselves when necessary.
2037 */
2038 sb->s_flags |= MS_POSIXACL;
2039 sb->s_time_gran = 1;
2040 }
2041
2042 sb->s_op = &nfs_sops;
2043 nfs_initialise_sb(sb);
2044 }
2045
2046 /*
2047 * Finish setting up a cloned NFS2/3 superblock
2048 */
2049 static void nfs_clone_super(struct super_block *sb,
2050 const struct super_block *old_sb)
2051 {
2052 struct nfs_server *server = NFS_SB(sb);
2053
2054 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2055 sb->s_blocksize = old_sb->s_blocksize;
2056 sb->s_maxbytes = old_sb->s_maxbytes;
2057
2058 if (server->nfs_client->rpc_ops->version == 3) {
2059 /* The VFS shouldn't apply the umask to mode bits. We will do
2060 * so ourselves when necessary.
2061 */
2062 sb->s_flags |= MS_POSIXACL;
2063 sb->s_time_gran = 1;
2064 }
2065
2066 sb->s_op = old_sb->s_op;
2067 nfs_initialise_sb(sb);
2068 }
2069
2070 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2071 {
2072 const struct nfs_server *a = s->s_fs_info;
2073 const struct rpc_clnt *clnt_a = a->client;
2074 const struct rpc_clnt *clnt_b = b->client;
2075
2076 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2077 goto Ebusy;
2078 if (a->nfs_client != b->nfs_client)
2079 goto Ebusy;
2080 if (a->flags != b->flags)
2081 goto Ebusy;
2082 if (a->wsize != b->wsize)
2083 goto Ebusy;
2084 if (a->rsize != b->rsize)
2085 goto Ebusy;
2086 if (a->acregmin != b->acregmin)
2087 goto Ebusy;
2088 if (a->acregmax != b->acregmax)
2089 goto Ebusy;
2090 if (a->acdirmin != b->acdirmin)
2091 goto Ebusy;
2092 if (a->acdirmax != b->acdirmax)
2093 goto Ebusy;
2094 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2095 goto Ebusy;
2096 return 1;
2097 Ebusy:
2098 return 0;
2099 }
2100
2101 struct nfs_sb_mountdata {
2102 struct nfs_server *server;
2103 int mntflags;
2104 };
2105
2106 static int nfs_set_super(struct super_block *s, void *data)
2107 {
2108 struct nfs_sb_mountdata *sb_mntdata = data;
2109 struct nfs_server *server = sb_mntdata->server;
2110 int ret;
2111
2112 s->s_flags = sb_mntdata->mntflags;
2113 s->s_fs_info = server;
2114 ret = set_anon_super(s, server);
2115 if (ret == 0)
2116 server->s_dev = s->s_dev;
2117 return ret;
2118 }
2119
2120 static int nfs_compare_super_address(struct nfs_server *server1,
2121 struct nfs_server *server2)
2122 {
2123 struct sockaddr *sap1, *sap2;
2124
2125 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2126 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2127
2128 if (sap1->sa_family != sap2->sa_family)
2129 return 0;
2130
2131 switch (sap1->sa_family) {
2132 case AF_INET: {
2133 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2134 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2135 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2136 return 0;
2137 if (sin1->sin_port != sin2->sin_port)
2138 return 0;
2139 break;
2140 }
2141 case AF_INET6: {
2142 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2143 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2144 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2145 return 0;
2146 if (sin1->sin6_port != sin2->sin6_port)
2147 return 0;
2148 break;
2149 }
2150 default:
2151 return 0;
2152 }
2153
2154 return 1;
2155 }
2156
2157 static int nfs_compare_super(struct super_block *sb, void *data)
2158 {
2159 struct nfs_sb_mountdata *sb_mntdata = data;
2160 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2161 int mntflags = sb_mntdata->mntflags;
2162
2163 if (!nfs_compare_super_address(old, server))
2164 return 0;
2165 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2166 if (old->flags & NFS_MOUNT_UNSHARED)
2167 return 0;
2168 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2169 return 0;
2170 return nfs_compare_mount_options(sb, server, mntflags);
2171 }
2172
2173 static int nfs_bdi_register(struct nfs_server *server)
2174 {
2175 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2176 }
2177
2178 static int nfs_get_sb(struct file_system_type *fs_type,
2179 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2180 {
2181 struct nfs_server *server = NULL;
2182 struct super_block *s;
2183 struct nfs_parsed_mount_data *data;
2184 struct nfs_fh *mntfh;
2185 struct dentry *mntroot;
2186 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2187 struct nfs_sb_mountdata sb_mntdata = {
2188 .mntflags = flags,
2189 };
2190 int error = -ENOMEM;
2191
2192 data = nfs_alloc_parsed_mount_data(3);
2193 mntfh = nfs_alloc_fhandle();
2194 if (data == NULL || mntfh == NULL)
2195 goto out_free_fh;
2196
2197 security_init_mnt_opts(&data->lsm_opts);
2198
2199 /* Validate the mount data */
2200 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2201 if (error < 0)
2202 goto out;
2203
2204 #ifdef CONFIG_NFS_V4
2205 if (data->version == 4) {
2206 error = nfs4_try_mount(flags, dev_name, data, mnt);
2207 kfree(data->client_address);
2208 kfree(data->nfs_server.export_path);
2209 goto out;
2210 }
2211 #endif /* CONFIG_NFS_V4 */
2212
2213 /* Get a volume representation */
2214 server = nfs_create_server(data, mntfh);
2215 if (IS_ERR(server)) {
2216 error = PTR_ERR(server);
2217 goto out;
2218 }
2219 sb_mntdata.server = server;
2220
2221 if (server->flags & NFS_MOUNT_UNSHARED)
2222 compare_super = NULL;
2223
2224 /* Get a superblock - note that we may end up sharing one that already exists */
2225 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2226 if (IS_ERR(s)) {
2227 error = PTR_ERR(s);
2228 goto out_err_nosb;
2229 }
2230
2231 if (s->s_fs_info != server) {
2232 nfs_free_server(server);
2233 server = NULL;
2234 } else {
2235 error = nfs_bdi_register(server);
2236 if (error)
2237 goto error_splat_bdi;
2238 }
2239
2240 if (!s->s_root) {
2241 /* initial superblock/root creation */
2242 nfs_fill_super(s, data);
2243 nfs_fscache_get_super_cookie(
2244 s, data ? data->fscache_uniq : NULL, NULL);
2245 }
2246
2247 mntroot = nfs_get_root(s, mntfh);
2248 if (IS_ERR(mntroot)) {
2249 error = PTR_ERR(mntroot);
2250 goto error_splat_super;
2251 }
2252
2253 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2254 if (error)
2255 goto error_splat_root;
2256
2257 s->s_flags |= MS_ACTIVE;
2258 mnt->mnt_sb = s;
2259 mnt->mnt_root = mntroot;
2260 error = 0;
2261
2262 out:
2263 kfree(data->nfs_server.hostname);
2264 kfree(data->mount_server.hostname);
2265 kfree(data->fscache_uniq);
2266 security_free_mnt_opts(&data->lsm_opts);
2267 out_free_fh:
2268 nfs_free_fhandle(mntfh);
2269 kfree(data);
2270 return error;
2271
2272 out_err_nosb:
2273 nfs_free_server(server);
2274 goto out;
2275
2276 error_splat_root:
2277 dput(mntroot);
2278 error_splat_super:
2279 if (server && !s->s_root)
2280 bdi_unregister(&server->backing_dev_info);
2281 error_splat_bdi:
2282 deactivate_locked_super(s);
2283 goto out;
2284 }
2285
2286 /*
2287 * Ensure that we unregister the bdi before kill_anon_super
2288 * releases the device name
2289 */
2290 static void nfs_put_super(struct super_block *s)
2291 {
2292 struct nfs_server *server = NFS_SB(s);
2293
2294 bdi_unregister(&server->backing_dev_info);
2295 }
2296
2297 /*
2298 * Destroy an NFS2/3 superblock
2299 */
2300 static void nfs_kill_super(struct super_block *s)
2301 {
2302 struct nfs_server *server = NFS_SB(s);
2303
2304 kill_anon_super(s);
2305 nfs_fscache_release_super_cookie(s);
2306 nfs_free_server(server);
2307 }
2308
2309 /*
2310 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2311 */
2312 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2313 const char *dev_name, void *raw_data,
2314 struct vfsmount *mnt)
2315 {
2316 struct nfs_clone_mount *data = raw_data;
2317 struct super_block *s;
2318 struct nfs_server *server;
2319 struct dentry *mntroot;
2320 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2321 struct nfs_sb_mountdata sb_mntdata = {
2322 .mntflags = flags,
2323 };
2324 int error;
2325
2326 dprintk("--> nfs_xdev_get_sb()\n");
2327
2328 /* create a new volume representation */
2329 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2330 if (IS_ERR(server)) {
2331 error = PTR_ERR(server);
2332 goto out_err_noserver;
2333 }
2334 sb_mntdata.server = server;
2335
2336 if (server->flags & NFS_MOUNT_UNSHARED)
2337 compare_super = NULL;
2338
2339 /* Get a superblock - note that we may end up sharing one that already exists */
2340 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2341 if (IS_ERR(s)) {
2342 error = PTR_ERR(s);
2343 goto out_err_nosb;
2344 }
2345
2346 if (s->s_fs_info != server) {
2347 nfs_free_server(server);
2348 server = NULL;
2349 } else {
2350 error = nfs_bdi_register(server);
2351 if (error)
2352 goto error_splat_bdi;
2353 }
2354
2355 if (!s->s_root) {
2356 /* initial superblock/root creation */
2357 nfs_clone_super(s, data->sb);
2358 nfs_fscache_get_super_cookie(s, NULL, data);
2359 }
2360
2361 mntroot = nfs_get_root(s, data->fh);
2362 if (IS_ERR(mntroot)) {
2363 error = PTR_ERR(mntroot);
2364 goto error_splat_super;
2365 }
2366 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2367 dput(mntroot);
2368 error = -ESTALE;
2369 goto error_splat_super;
2370 }
2371
2372 s->s_flags |= MS_ACTIVE;
2373 mnt->mnt_sb = s;
2374 mnt->mnt_root = mntroot;
2375
2376 /* clone any lsm security options from the parent to the new sb */
2377 security_sb_clone_mnt_opts(data->sb, s);
2378
2379 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2380 return 0;
2381
2382 out_err_nosb:
2383 nfs_free_server(server);
2384 out_err_noserver:
2385 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2386 return error;
2387
2388 error_splat_super:
2389 if (server && !s->s_root)
2390 bdi_unregister(&server->backing_dev_info);
2391 error_splat_bdi:
2392 deactivate_locked_super(s);
2393 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2394 return error;
2395 }
2396
2397 #ifdef CONFIG_NFS_V4
2398
2399 /*
2400 * Finish setting up a cloned NFS4 superblock
2401 */
2402 static void nfs4_clone_super(struct super_block *sb,
2403 const struct super_block *old_sb)
2404 {
2405 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2406 sb->s_blocksize = old_sb->s_blocksize;
2407 sb->s_maxbytes = old_sb->s_maxbytes;
2408 sb->s_time_gran = 1;
2409 sb->s_op = old_sb->s_op;
2410 nfs_initialise_sb(sb);
2411 }
2412
2413 /*
2414 * Set up an NFS4 superblock
2415 */
2416 static void nfs4_fill_super(struct super_block *sb)
2417 {
2418 sb->s_time_gran = 1;
2419 sb->s_op = &nfs4_sops;
2420 nfs_initialise_sb(sb);
2421 }
2422
2423 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2424 {
2425 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2426 }
2427
2428 static int nfs4_validate_text_mount_data(void *options,
2429 struct nfs_parsed_mount_data *args,
2430 const char *dev_name)
2431 {
2432 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2433
2434 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2435
2436 nfs_validate_transport_protocol(args);
2437
2438 nfs4_validate_mount_flags(args);
2439
2440 if (args->version != 4) {
2441 dfprintk(MOUNT,
2442 "NFS4: Illegal mount version\n");
2443 return -EINVAL;
2444 }
2445
2446 if (args->auth_flavor_len > 1) {
2447 dfprintk(MOUNT,
2448 "NFS4: Too many RPC auth flavours specified\n");
2449 return -EINVAL;
2450 }
2451
2452 if (args->client_address == NULL) {
2453 dfprintk(MOUNT,
2454 "NFS4: mount program didn't pass callback address\n");
2455 return -EINVAL;
2456 }
2457
2458 return nfs_parse_devname(dev_name,
2459 &args->nfs_server.hostname,
2460 NFS4_MAXNAMLEN,
2461 &args->nfs_server.export_path,
2462 NFS4_MAXPATHLEN);
2463 }
2464
2465 /*
2466 * Validate NFSv4 mount options
2467 */
2468 static int nfs4_validate_mount_data(void *options,
2469 struct nfs_parsed_mount_data *args,
2470 const char *dev_name)
2471 {
2472 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2473 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2474 char *c;
2475
2476 if (data == NULL)
2477 goto out_no_data;
2478
2479 switch (data->version) {
2480 case 1:
2481 if (data->host_addrlen > sizeof(args->nfs_server.address))
2482 goto out_no_address;
2483 if (data->host_addrlen == 0)
2484 goto out_no_address;
2485 args->nfs_server.addrlen = data->host_addrlen;
2486 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2487 return -EFAULT;
2488 if (!nfs_verify_server_address(sap))
2489 goto out_no_address;
2490
2491 if (data->auth_flavourlen) {
2492 if (data->auth_flavourlen > 1)
2493 goto out_inval_auth;
2494 if (copy_from_user(&args->auth_flavors[0],
2495 data->auth_flavours,
2496 sizeof(args->auth_flavors[0])))
2497 return -EFAULT;
2498 }
2499
2500 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2501 if (IS_ERR(c))
2502 return PTR_ERR(c);
2503 args->nfs_server.hostname = c;
2504
2505 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2506 if (IS_ERR(c))
2507 return PTR_ERR(c);
2508 args->nfs_server.export_path = c;
2509 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2510
2511 c = strndup_user(data->client_addr.data, 16);
2512 if (IS_ERR(c))
2513 return PTR_ERR(c);
2514 args->client_address = c;
2515
2516 /*
2517 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2518 * can deal with.
2519 */
2520
2521 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2522 args->rsize = data->rsize;
2523 args->wsize = data->wsize;
2524 args->timeo = data->timeo;
2525 args->retrans = data->retrans;
2526 args->acregmin = data->acregmin;
2527 args->acregmax = data->acregmax;
2528 args->acdirmin = data->acdirmin;
2529 args->acdirmax = data->acdirmax;
2530 args->nfs_server.protocol = data->proto;
2531 nfs_validate_transport_protocol(args);
2532
2533 break;
2534 default:
2535 if (nfs_parse_mount_options((char *)options, args) == 0)
2536 return -EINVAL;
2537
2538 if (!nfs_verify_server_address(sap))
2539 return -EINVAL;
2540
2541 return nfs4_validate_text_mount_data(options, args, dev_name);
2542 }
2543
2544 return 0;
2545
2546 out_no_data:
2547 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2548 return -EINVAL;
2549
2550 out_inval_auth:
2551 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2552 data->auth_flavourlen);
2553 return -EINVAL;
2554
2555 out_no_address:
2556 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2557 return -EINVAL;
2558 }
2559
2560 /*
2561 * Get the superblock for the NFS4 root partition
2562 */
2563 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2564 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2565 {
2566 struct nfs_parsed_mount_data *data = raw_data;
2567 struct super_block *s;
2568 struct nfs_server *server;
2569 struct nfs_fh *mntfh;
2570 struct dentry *mntroot;
2571 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2572 struct nfs_sb_mountdata sb_mntdata = {
2573 .mntflags = flags,
2574 };
2575 int error = -ENOMEM;
2576
2577 mntfh = nfs_alloc_fhandle();
2578 if (data == NULL || mntfh == NULL)
2579 goto out_free_fh;
2580
2581 security_init_mnt_opts(&data->lsm_opts);
2582
2583 /* Get a volume representation */
2584 server = nfs4_create_server(data, mntfh);
2585 if (IS_ERR(server)) {
2586 error = PTR_ERR(server);
2587 goto out;
2588 }
2589 sb_mntdata.server = server;
2590
2591 if (server->flags & NFS4_MOUNT_UNSHARED)
2592 compare_super = NULL;
2593
2594 /* Get a superblock - note that we may end up sharing one that already exists */
2595 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2596 if (IS_ERR(s)) {
2597 error = PTR_ERR(s);
2598 goto out_free;
2599 }
2600
2601 if (s->s_fs_info != server) {
2602 nfs_free_server(server);
2603 server = NULL;
2604 } else {
2605 error = nfs_bdi_register(server);
2606 if (error)
2607 goto error_splat_bdi;
2608 }
2609
2610 if (!s->s_root) {
2611 /* initial superblock/root creation */
2612 nfs4_fill_super(s);
2613 nfs_fscache_get_super_cookie(
2614 s, data ? data->fscache_uniq : NULL, NULL);
2615 }
2616
2617 mntroot = nfs4_get_root(s, mntfh);
2618 if (IS_ERR(mntroot)) {
2619 error = PTR_ERR(mntroot);
2620 goto error_splat_super;
2621 }
2622
2623 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2624 if (error)
2625 goto error_splat_root;
2626
2627 s->s_flags |= MS_ACTIVE;
2628 mnt->mnt_sb = s;
2629 mnt->mnt_root = mntroot;
2630 error = 0;
2631
2632 out:
2633 security_free_mnt_opts(&data->lsm_opts);
2634 out_free_fh:
2635 nfs_free_fhandle(mntfh);
2636 return error;
2637
2638 out_free:
2639 nfs_free_server(server);
2640 goto out;
2641
2642 error_splat_root:
2643 dput(mntroot);
2644 error_splat_super:
2645 if (server && !s->s_root)
2646 bdi_unregister(&server->backing_dev_info);
2647 error_splat_bdi:
2648 deactivate_locked_super(s);
2649 goto out;
2650 }
2651
2652 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2653 int flags, void *data, const char *hostname)
2654 {
2655 struct vfsmount *root_mnt;
2656 char *root_devname;
2657 size_t len;
2658
2659 len = strlen(hostname) + 3;
2660 root_devname = kmalloc(len, GFP_KERNEL);
2661 if (root_devname == NULL)
2662 return ERR_PTR(-ENOMEM);
2663 snprintf(root_devname, len, "%s:/", hostname);
2664 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2665 kfree(root_devname);
2666 return root_mnt;
2667 }
2668
2669 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2670 {
2671 char *page = (char *) __get_free_page(GFP_KERNEL);
2672 char *devname, *tmp;
2673
2674 if (page == NULL)
2675 return;
2676 devname = nfs_path(path->mnt->mnt_devname,
2677 path->mnt->mnt_root, path->dentry,
2678 page, PAGE_SIZE);
2679 if (IS_ERR(devname))
2680 goto out_freepage;
2681 tmp = kstrdup(devname, GFP_KERNEL);
2682 if (tmp == NULL)
2683 goto out_freepage;
2684 kfree(mnt->mnt_devname);
2685 mnt->mnt_devname = tmp;
2686 out_freepage:
2687 free_page((unsigned long)page);
2688 }
2689
2690 struct nfs_referral_count {
2691 struct list_head list;
2692 const struct task_struct *task;
2693 unsigned int referral_count;
2694 };
2695
2696 static LIST_HEAD(nfs_referral_count_list);
2697 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2698
2699 static struct nfs_referral_count *nfs_find_referral_count(void)
2700 {
2701 struct nfs_referral_count *p;
2702
2703 list_for_each_entry(p, &nfs_referral_count_list, list) {
2704 if (p->task == current)
2705 return p;
2706 }
2707 return NULL;
2708 }
2709
2710 #define NFS_MAX_NESTED_REFERRALS 2
2711
2712 static int nfs_referral_loop_protect(void)
2713 {
2714 struct nfs_referral_count *p, *new;
2715 int ret = -ENOMEM;
2716
2717 new = kmalloc(sizeof(*new), GFP_KERNEL);
2718 if (!new)
2719 goto out;
2720 new->task = current;
2721 new->referral_count = 1;
2722
2723 ret = 0;
2724 spin_lock(&nfs_referral_count_list_lock);
2725 p = nfs_find_referral_count();
2726 if (p != NULL) {
2727 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2728 ret = -ELOOP;
2729 else
2730 p->referral_count++;
2731 } else {
2732 list_add(&new->list, &nfs_referral_count_list);
2733 new = NULL;
2734 }
2735 spin_unlock(&nfs_referral_count_list_lock);
2736 kfree(new);
2737 out:
2738 return ret;
2739 }
2740
2741 static void nfs_referral_loop_unprotect(void)
2742 {
2743 struct nfs_referral_count *p;
2744
2745 spin_lock(&nfs_referral_count_list_lock);
2746 p = nfs_find_referral_count();
2747 p->referral_count--;
2748 if (p->referral_count == 0)
2749 list_del(&p->list);
2750 else
2751 p = NULL;
2752 spin_unlock(&nfs_referral_count_list_lock);
2753 kfree(p);
2754 }
2755
2756 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2757 const char *export_path, struct vfsmount *mnt_target)
2758 {
2759 struct nameidata *nd = NULL;
2760 struct mnt_namespace *ns_private;
2761 struct super_block *s;
2762 int ret;
2763
2764 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2765 if (nd == NULL)
2766 return -ENOMEM;
2767
2768 ns_private = create_mnt_ns(root_mnt);
2769 ret = PTR_ERR(ns_private);
2770 if (IS_ERR(ns_private))
2771 goto out_mntput;
2772
2773 ret = nfs_referral_loop_protect();
2774 if (ret != 0)
2775 goto out_put_mnt_ns;
2776
2777 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2778 export_path, LOOKUP_FOLLOW, nd);
2779
2780 nfs_referral_loop_unprotect();
2781 put_mnt_ns(ns_private);
2782
2783 if (ret != 0)
2784 goto out_err;
2785
2786 s = nd->path.mnt->mnt_sb;
2787 atomic_inc(&s->s_active);
2788 mnt_target->mnt_sb = s;
2789 mnt_target->mnt_root = dget(nd->path.dentry);
2790
2791 /* Correct the device pathname */
2792 nfs_fix_devname(&nd->path, mnt_target);
2793
2794 path_put(&nd->path);
2795 kfree(nd);
2796 down_write(&s->s_umount);
2797 return 0;
2798 out_put_mnt_ns:
2799 put_mnt_ns(ns_private);
2800 out_mntput:
2801 mntput(root_mnt);
2802 out_err:
2803 kfree(nd);
2804 return ret;
2805 }
2806
2807 static int nfs4_try_mount(int flags, const char *dev_name,
2808 struct nfs_parsed_mount_data *data,
2809 struct vfsmount *mnt)
2810 {
2811 char *export_path;
2812 struct vfsmount *root_mnt;
2813 int error;
2814
2815 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2816
2817 export_path = data->nfs_server.export_path;
2818 data->nfs_server.export_path = "/";
2819 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2820 data->nfs_server.hostname);
2821 data->nfs_server.export_path = export_path;
2822
2823 error = PTR_ERR(root_mnt);
2824 if (IS_ERR(root_mnt))
2825 goto out;
2826
2827 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2828
2829 out:
2830 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2831 error != 0 ? " [error]" : "");
2832 return error;
2833 }
2834
2835 /*
2836 * Get the superblock for an NFS4 mountpoint
2837 */
2838 static int nfs4_get_sb(struct file_system_type *fs_type,
2839 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2840 {
2841 struct nfs_parsed_mount_data *data;
2842 int error = -ENOMEM;
2843
2844 data = nfs_alloc_parsed_mount_data(4);
2845 if (data == NULL)
2846 goto out_free_data;
2847
2848 /* Validate the mount data */
2849 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2850 if (error < 0)
2851 goto out;
2852
2853 error = nfs4_try_mount(flags, dev_name, data, mnt);
2854
2855 out:
2856 kfree(data->client_address);
2857 kfree(data->nfs_server.export_path);
2858 kfree(data->nfs_server.hostname);
2859 kfree(data->fscache_uniq);
2860 out_free_data:
2861 kfree(data);
2862 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2863 error != 0 ? " [error]" : "");
2864 return error;
2865 }
2866
2867 static void nfs4_kill_super(struct super_block *sb)
2868 {
2869 struct nfs_server *server = NFS_SB(sb);
2870
2871 dprintk("--> %s\n", __func__);
2872 nfs_super_return_all_delegations(sb);
2873 kill_anon_super(sb);
2874 nfs_fscache_release_super_cookie(sb);
2875 nfs_free_server(server);
2876 dprintk("<-- %s\n", __func__);
2877 }
2878
2879 /*
2880 * Clone an NFS4 server record on xdev traversal (FSID-change)
2881 */
2882 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2883 const char *dev_name, void *raw_data,
2884 struct vfsmount *mnt)
2885 {
2886 struct nfs_clone_mount *data = raw_data;
2887 struct super_block *s;
2888 struct nfs_server *server;
2889 struct dentry *mntroot;
2890 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2891 struct nfs_sb_mountdata sb_mntdata = {
2892 .mntflags = flags,
2893 };
2894 int error;
2895
2896 dprintk("--> nfs4_xdev_get_sb()\n");
2897
2898 /* create a new volume representation */
2899 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2900 if (IS_ERR(server)) {
2901 error = PTR_ERR(server);
2902 goto out_err_noserver;
2903 }
2904 sb_mntdata.server = server;
2905
2906 if (server->flags & NFS4_MOUNT_UNSHARED)
2907 compare_super = NULL;
2908
2909 /* Get a superblock - note that we may end up sharing one that already exists */
2910 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2911 if (IS_ERR(s)) {
2912 error = PTR_ERR(s);
2913 goto out_err_nosb;
2914 }
2915
2916 if (s->s_fs_info != server) {
2917 nfs_free_server(server);
2918 server = NULL;
2919 } else {
2920 error = nfs_bdi_register(server);
2921 if (error)
2922 goto error_splat_bdi;
2923 }
2924
2925 if (!s->s_root) {
2926 /* initial superblock/root creation */
2927 nfs4_clone_super(s, data->sb);
2928 nfs_fscache_get_super_cookie(s, NULL, data);
2929 }
2930
2931 mntroot = nfs4_get_root(s, data->fh);
2932 if (IS_ERR(mntroot)) {
2933 error = PTR_ERR(mntroot);
2934 goto error_splat_super;
2935 }
2936 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2937 dput(mntroot);
2938 error = -ESTALE;
2939 goto error_splat_super;
2940 }
2941
2942 s->s_flags |= MS_ACTIVE;
2943 mnt->mnt_sb = s;
2944 mnt->mnt_root = mntroot;
2945
2946 security_sb_clone_mnt_opts(data->sb, s);
2947
2948 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2949 return 0;
2950
2951 out_err_nosb:
2952 nfs_free_server(server);
2953 out_err_noserver:
2954 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2955 return error;
2956
2957 error_splat_super:
2958 if (server && !s->s_root)
2959 bdi_unregister(&server->backing_dev_info);
2960 error_splat_bdi:
2961 deactivate_locked_super(s);
2962 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2963 return error;
2964 }
2965
2966 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2967 int flags, const char *dev_name, void *raw_data,
2968 struct vfsmount *mnt)
2969 {
2970 struct nfs_clone_mount *data = raw_data;
2971 struct super_block *s;
2972 struct nfs_server *server;
2973 struct dentry *mntroot;
2974 struct nfs_fh *mntfh;
2975 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2976 struct nfs_sb_mountdata sb_mntdata = {
2977 .mntflags = flags,
2978 };
2979 int error = -ENOMEM;
2980
2981 dprintk("--> nfs4_referral_get_sb()\n");
2982
2983 mntfh = nfs_alloc_fhandle();
2984 if (mntfh == NULL)
2985 goto out_err_nofh;
2986
2987 /* create a new volume representation */
2988 server = nfs4_create_referral_server(data, mntfh);
2989 if (IS_ERR(server)) {
2990 error = PTR_ERR(server);
2991 goto out_err_noserver;
2992 }
2993 sb_mntdata.server = server;
2994
2995 if (server->flags & NFS4_MOUNT_UNSHARED)
2996 compare_super = NULL;
2997
2998 /* Get a superblock - note that we may end up sharing one that already exists */
2999 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3000 if (IS_ERR(s)) {
3001 error = PTR_ERR(s);
3002 goto out_err_nosb;
3003 }
3004
3005 if (s->s_fs_info != server) {
3006 nfs_free_server(server);
3007 server = NULL;
3008 } else {
3009 error = nfs_bdi_register(server);
3010 if (error)
3011 goto error_splat_bdi;
3012 }
3013
3014 if (!s->s_root) {
3015 /* initial superblock/root creation */
3016 nfs4_fill_super(s);
3017 nfs_fscache_get_super_cookie(s, NULL, data);
3018 }
3019
3020 mntroot = nfs4_get_root(s, mntfh);
3021 if (IS_ERR(mntroot)) {
3022 error = PTR_ERR(mntroot);
3023 goto error_splat_super;
3024 }
3025 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3026 dput(mntroot);
3027 error = -ESTALE;
3028 goto error_splat_super;
3029 }
3030
3031 s->s_flags |= MS_ACTIVE;
3032 mnt->mnt_sb = s;
3033 mnt->mnt_root = mntroot;
3034
3035 security_sb_clone_mnt_opts(data->sb, s);
3036
3037 nfs_free_fhandle(mntfh);
3038 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3039 return 0;
3040
3041 out_err_nosb:
3042 nfs_free_server(server);
3043 out_err_noserver:
3044 nfs_free_fhandle(mntfh);
3045 out_err_nofh:
3046 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3047 return error;
3048
3049 error_splat_super:
3050 if (server && !s->s_root)
3051 bdi_unregister(&server->backing_dev_info);
3052 error_splat_bdi:
3053 deactivate_locked_super(s);
3054 nfs_free_fhandle(mntfh);
3055 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3056 return error;
3057 }
3058
3059 /*
3060 * Create an NFS4 server record on referral traversal
3061 */
3062 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3063 int flags, const char *dev_name, void *raw_data,
3064 struct vfsmount *mnt)
3065 {
3066 struct nfs_clone_mount *data = raw_data;
3067 char *export_path;
3068 struct vfsmount *root_mnt;
3069 int error;
3070
3071 dprintk("--> nfs4_referral_get_sb()\n");
3072
3073 export_path = data->mnt_path;
3074 data->mnt_path = "/";
3075
3076 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3077 flags, data, data->hostname);
3078 data->mnt_path = export_path;
3079
3080 error = PTR_ERR(root_mnt);
3081 if (IS_ERR(root_mnt))
3082 goto out;
3083
3084 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3085 out:
3086 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3087 error != 0 ? " [error]" : "");
3088 return error;
3089 }
3090
3091 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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