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[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/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/mnt_namespace.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66 #include "pnfs.h"
67
68 #define NFSDBG_FACILITY NFSDBG_VFS
69
70 #ifdef CONFIG_NFS_V3
71 #define NFS_DEFAULT_VERSION 3
72 #else
73 #define NFS_DEFAULT_VERSION 2
74 #endif
75
76 enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
83 Opt_v2, Opt_v3, Opt_v4,
84 Opt_udp, Opt_tcp, Opt_rdma,
85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
87 Opt_sharecache, Opt_nosharecache,
88 Opt_resvport, Opt_noresvport,
89 Opt_fscache, Opt_nofscache,
90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
100 Opt_mountvers,
101 Opt_nfsvers,
102 Opt_minorversion,
103
104 /* Mount options that take string arguments */
105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
107 Opt_lookupcache,
108 Opt_fscache_uniq,
109 Opt_local_lock,
110
111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
113
114 Opt_err
115 };
116
117 static const match_table_t nfs_mount_option_tokens = {
118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
120 { Opt_userspace, "retry=%s" },
121
122 { Opt_sloppy, "sloppy" },
123
124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
138 { Opt_v4, "v4" },
139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
141 { Opt_rdma, "rdma" },
142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
150 { Opt_fscache, "fsc" },
151 { Opt_nofscache, "nofsc" },
152
153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
169 { Opt_minorversion, "minorversion=%s" },
170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
176 { Opt_mounthost, "mounthost=%s" },
177 { Opt_mountaddr, "mountaddr=%s" },
178
179 { Opt_lookupcache, "lookupcache=%s" },
180 { Opt_fscache_uniq, "fsc=%s" },
181 { Opt_local_lock, "local_lock=%s" },
182
183 { Opt_err, NULL }
184 };
185
186 enum {
187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
188
189 Opt_xprt_err
190 };
191
192 static const match_table_t nfs_xprt_protocol_tokens = {
193 { Opt_xprt_udp, "udp" },
194 { Opt_xprt_udp6, "udp6" },
195 { Opt_xprt_tcp, "tcp" },
196 { Opt_xprt_tcp6, "tcp6" },
197 { Opt_xprt_rdma, "rdma" },
198
199 { Opt_xprt_err, NULL }
200 };
201
202 enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209 };
210
211 static const match_table_t nfs_secflavor_tokens = {
212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
228 { Opt_sec_err, NULL }
229 };
230
231 enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236 };
237
238 static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245 };
246
247 enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252 };
253
254 static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261 };
262
263
264 static void nfs_umount_begin(struct super_block *);
265 static int nfs_statfs(struct dentry *, struct kstatfs *);
266 static int nfs_show_options(struct seq_file *, struct vfsmount *);
267 static int nfs_show_devname(struct seq_file *, struct vfsmount *);
268 static int nfs_show_path(struct seq_file *, struct vfsmount *);
269 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
270 static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
272 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
274 static void nfs_put_super(struct super_block *);
275 static void nfs_kill_super(struct super_block *);
276 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
277
278 static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
281 .mount = nfs_fs_mount,
282 .kill_sb = nfs_kill_super,
283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
284 };
285
286 struct file_system_type nfs_xdev_fs_type = {
287 .owner = THIS_MODULE,
288 .name = "nfs",
289 .mount = nfs_xdev_mount,
290 .kill_sb = nfs_kill_super,
291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
292 };
293
294 static const struct super_operations nfs_sops = {
295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
298 .put_super = nfs_put_super,
299 .statfs = nfs_statfs,
300 .evict_inode = nfs_evict_inode,
301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
305 .show_stats = nfs_show_stats,
306 .remount_fs = nfs_remount,
307 };
308
309 #ifdef CONFIG_NFS_V4
310 static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
312 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
316 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
322 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
324 static void nfs4_kill_super(struct super_block *sb);
325
326 static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
329 .mount = nfs4_mount,
330 .kill_sb = nfs4_kill_super,
331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
332 };
333
334 static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
337 .mount = nfs4_remote_mount,
338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340 };
341
342 struct file_system_type nfs4_xdev_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
345 .mount = nfs4_xdev_mount,
346 .kill_sb = nfs4_kill_super,
347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
348 };
349
350 static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
353 .mount = nfs4_remote_referral_mount,
354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356 };
357
358 struct file_system_type nfs4_referral_fs_type = {
359 .owner = THIS_MODULE,
360 .name = "nfs4",
361 .mount = nfs4_referral_mount,
362 .kill_sb = nfs4_kill_super,
363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
364 };
365
366 static const struct super_operations nfs4_sops = {
367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
370 .put_super = nfs_put_super,
371 .statfs = nfs_statfs,
372 .evict_inode = nfs4_evict_inode,
373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
377 .show_stats = nfs_show_stats,
378 .remount_fs = nfs_remount,
379 };
380 #endif
381
382 static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385 };
386
387 /*
388 * Register the NFS filesystems
389 */
390 int __init register_nfs_fs(void)
391 {
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
401 #ifdef CONFIG_NFS_V4
402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405 #endif
406 register_shrinker(&acl_shrinker);
407 return 0;
408
409 #ifdef CONFIG_NFS_V4
410 error_2:
411 nfs_unregister_sysctl();
412 #endif
413 error_1:
414 unregister_filesystem(&nfs_fs_type);
415 error_0:
416 return ret;
417 }
418
419 /*
420 * Unregister the NFS filesystems
421 */
422 void __exit unregister_nfs_fs(void)
423 {
424 unregister_shrinker(&acl_shrinker);
425 #ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
427 #endif
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type);
430 }
431
432 void nfs_sb_active(struct super_block *sb)
433 {
434 struct nfs_server *server = NFS_SB(sb);
435
436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
438 }
439
440 void nfs_sb_deactive(struct super_block *sb)
441 {
442 struct nfs_server *server = NFS_SB(sb);
443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
446 }
447
448 /*
449 * Deliver file system statistics to userspace
450 */
451 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
452 {
453 struct nfs_server *server = NFS_SB(dentry->d_sb);
454 unsigned char blockbits;
455 unsigned long blockres;
456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
463
464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
474 nfs_free_fattr(res.fattr);
475 if (error < 0)
476 goto out_err;
477
478 buf->f_type = NFS_SUPER_MAGIC;
479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
485 buf->f_frsize = dentry->d_sb->s_blocksize;
486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
505
506 return 0;
507
508 out_err:
509 dprintk("%s: statfs error = %d\n", __func__, -error);
510 return error;
511 }
512
513 /*
514 * Map the security flavour number to a name
515 */
516 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517 {
518 static const struct {
519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
533 { UINT_MAX, "unknown" }
534 };
535 int i;
536
537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542 }
543
544 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546 {
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581 }
582
583 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585 {
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
614 nfs_show_mountd_netid(m, nfss, showdefaults);
615 }
616
617 #ifdef CONFIG_NFS_V4
618 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620 {
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625 }
626 #else
627 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629 {
630 }
631 #endif
632
633 /*
634 * Describe the mount options in force on this server representation
635 */
636 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
638 {
639 static const struct proc_nfs_info {
640 int flag;
641 const char *str;
642 const char *nostr;
643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX, ",posix", "" },
646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
653 { 0, NULL, NULL }
654 };
655 const struct proc_nfs_info *nfs_infop;
656 struct nfs_client *clp = nfss->nfs_client;
657 u32 version = clp->rpc_ops->version;
658 int local_flock, local_fcntl;
659
660 seq_printf(m, ",vers=%u", version);
661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
680 seq_printf(m, ",proto=%s",
681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
697
698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
719 }
720
721 /*
722 * Describe the mount options on this VFS mountpoint
723 */
724 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
725 {
726 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
727
728 nfs_show_mount_options(m, nfss, 0);
729
730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
733
734 return 0;
735 }
736 #ifdef CONFIG_NFS_V4_1
737 void show_sessions(struct seq_file *m, struct nfs_server *server)
738 {
739 if (nfs4_has_session(server->nfs_client))
740 seq_printf(m, ",sessions");
741 }
742 #else
743 void show_sessions(struct seq_file *m, struct nfs_server *server) {}
744 #endif
745
746 #ifdef CONFIG_NFS_V4_1
747 void show_pnfs(struct seq_file *m, struct nfs_server *server)
748 {
749 seq_printf(m, ",pnfs=");
750 if (server->pnfs_curr_ld)
751 seq_printf(m, "%s", server->pnfs_curr_ld->name);
752 else
753 seq_printf(m, "not configured");
754 }
755 #else /* CONFIG_NFS_V4_1 */
756 void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
757 #endif /* CONFIG_NFS_V4_1 */
758
759 static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
760 {
761 char *page = (char *) __get_free_page(GFP_KERNEL);
762 char *devname, *dummy;
763 int err = 0;
764 if (!page)
765 return -ENOMEM;
766 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
767 if (IS_ERR(devname))
768 err = PTR_ERR(devname);
769 else
770 seq_escape(m, devname, " \t\n\\");
771 free_page((unsigned long)page);
772 return err;
773 }
774
775 static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
776 {
777 seq_puts(m, "/");
778 return 0;
779 }
780
781 /*
782 * Present statistical information for this VFS mountpoint
783 */
784 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
785 {
786 int i, cpu;
787 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
788 struct rpc_auth *auth = nfss->client->cl_auth;
789 struct nfs_iostats totals = { };
790
791 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
792
793 /*
794 * Display all mount option settings
795 */
796 seq_printf(m, "\n\topts:\t");
797 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
798 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
799 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
800 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
801 nfs_show_mount_options(m, nfss, 1);
802
803 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
804
805 seq_printf(m, "\n\tcaps:\t");
806 seq_printf(m, "caps=0x%x", nfss->caps);
807 seq_printf(m, ",wtmult=%u", nfss->wtmult);
808 seq_printf(m, ",dtsize=%u", nfss->dtsize);
809 seq_printf(m, ",bsize=%u", nfss->bsize);
810 seq_printf(m, ",namlen=%u", nfss->namelen);
811
812 #ifdef CONFIG_NFS_V4
813 if (nfss->nfs_client->rpc_ops->version == 4) {
814 seq_printf(m, "\n\tnfsv4:\t");
815 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
816 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
817 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
818 show_sessions(m, nfss);
819 show_pnfs(m, nfss);
820 }
821 #endif
822
823 /*
824 * Display security flavor in effect for this mount
825 */
826 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
827 if (auth->au_flavor)
828 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
829
830 /*
831 * Display superblock I/O counters
832 */
833 for_each_possible_cpu(cpu) {
834 struct nfs_iostats *stats;
835
836 preempt_disable();
837 stats = per_cpu_ptr(nfss->io_stats, cpu);
838
839 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
840 totals.events[i] += stats->events[i];
841 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
842 totals.bytes[i] += stats->bytes[i];
843 #ifdef CONFIG_NFS_FSCACHE
844 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
845 totals.fscache[i] += stats->fscache[i];
846 #endif
847
848 preempt_enable();
849 }
850
851 seq_printf(m, "\n\tevents:\t");
852 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
853 seq_printf(m, "%lu ", totals.events[i]);
854 seq_printf(m, "\n\tbytes:\t");
855 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
856 seq_printf(m, "%Lu ", totals.bytes[i]);
857 #ifdef CONFIG_NFS_FSCACHE
858 if (nfss->options & NFS_OPTION_FSCACHE) {
859 seq_printf(m, "\n\tfsc:\t");
860 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
862 }
863 #endif
864 seq_printf(m, "\n");
865
866 rpc_print_iostats(m, nfss->client);
867
868 return 0;
869 }
870
871 /*
872 * Begin unmount by attempting to remove all automounted mountpoints we added
873 * in response to xdev traversals and referrals
874 */
875 static void nfs_umount_begin(struct super_block *sb)
876 {
877 struct nfs_server *server;
878 struct rpc_clnt *rpc;
879
880 server = NFS_SB(sb);
881 /* -EIO all pending I/O */
882 rpc = server->client_acl;
883 if (!IS_ERR(rpc))
884 rpc_killall_tasks(rpc);
885 rpc = server->client;
886 if (!IS_ERR(rpc))
887 rpc_killall_tasks(rpc);
888 }
889
890 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
891 {
892 struct nfs_parsed_mount_data *data;
893
894 data = kzalloc(sizeof(*data), GFP_KERNEL);
895 if (data) {
896 data->acregmin = NFS_DEF_ACREGMIN;
897 data->acregmax = NFS_DEF_ACREGMAX;
898 data->acdirmin = NFS_DEF_ACDIRMIN;
899 data->acdirmax = NFS_DEF_ACDIRMAX;
900 data->mount_server.port = NFS_UNSPEC_PORT;
901 data->nfs_server.port = NFS_UNSPEC_PORT;
902 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
903 data->auth_flavors[0] = RPC_AUTH_UNIX;
904 data->auth_flavor_len = 1;
905 data->version = version;
906 data->minorversion = 0;
907 }
908 return data;
909 }
910
911 /*
912 * Sanity-check a server address provided by the mount command.
913 *
914 * Address family must be initialized, and address must not be
915 * the ANY address for that family.
916 */
917 static int nfs_verify_server_address(struct sockaddr *addr)
918 {
919 switch (addr->sa_family) {
920 case AF_INET: {
921 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
922 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
923 }
924 case AF_INET6: {
925 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
926 return !ipv6_addr_any(sa);
927 }
928 }
929
930 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
931 return 0;
932 }
933
934 /*
935 * Select between a default port value and a user-specified port value.
936 * If a zero value is set, then autobind will be used.
937 */
938 static void nfs_set_port(struct sockaddr *sap, int *port,
939 const unsigned short default_port)
940 {
941 if (*port == NFS_UNSPEC_PORT)
942 *port = default_port;
943
944 rpc_set_port(sap, *port);
945 }
946
947 /*
948 * Sanity check the NFS transport protocol.
949 *
950 */
951 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
952 {
953 switch (mnt->nfs_server.protocol) {
954 case XPRT_TRANSPORT_UDP:
955 case XPRT_TRANSPORT_TCP:
956 case XPRT_TRANSPORT_RDMA:
957 break;
958 default:
959 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
960 }
961 }
962
963 /*
964 * For text based NFSv2/v3 mounts, the mount protocol transport default
965 * settings should depend upon the specified NFS transport.
966 */
967 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
968 {
969 nfs_validate_transport_protocol(mnt);
970
971 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
972 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
973 return;
974 switch (mnt->nfs_server.protocol) {
975 case XPRT_TRANSPORT_UDP:
976 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
977 break;
978 case XPRT_TRANSPORT_TCP:
979 case XPRT_TRANSPORT_RDMA:
980 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
981 }
982 }
983
984 /*
985 * Parse the value of the 'sec=' option.
986 */
987 static int nfs_parse_security_flavors(char *value,
988 struct nfs_parsed_mount_data *mnt)
989 {
990 substring_t args[MAX_OPT_ARGS];
991
992 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
993
994 switch (match_token(value, nfs_secflavor_tokens, args)) {
995 case Opt_sec_none:
996 mnt->auth_flavors[0] = RPC_AUTH_NULL;
997 break;
998 case Opt_sec_sys:
999 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1000 break;
1001 case Opt_sec_krb5:
1002 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1003 break;
1004 case Opt_sec_krb5i:
1005 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1006 break;
1007 case Opt_sec_krb5p:
1008 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1009 break;
1010 case Opt_sec_lkey:
1011 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1012 break;
1013 case Opt_sec_lkeyi:
1014 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1015 break;
1016 case Opt_sec_lkeyp:
1017 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1018 break;
1019 case Opt_sec_spkm:
1020 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1021 break;
1022 case Opt_sec_spkmi:
1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1024 break;
1025 case Opt_sec_spkmp:
1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1027 break;
1028 default:
1029 return 0;
1030 }
1031
1032 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1033 mnt->auth_flavor_len = 1;
1034 return 1;
1035 }
1036
1037 static int nfs_get_option_str(substring_t args[], char **option)
1038 {
1039 kfree(*option);
1040 *option = match_strdup(args);
1041 return !option;
1042 }
1043
1044 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1045 {
1046 int rc;
1047 char *string;
1048
1049 string = match_strdup(args);
1050 if (string == NULL)
1051 return -ENOMEM;
1052 rc = strict_strtoul(string, 10, option);
1053 kfree(string);
1054
1055 return rc;
1056 }
1057
1058 /*
1059 * Error-check and convert a string of mount options from user space into
1060 * a data structure. The whole mount string is processed; bad options are
1061 * skipped as they are encountered. If there were no errors, return 1;
1062 * otherwise return 0 (zero).
1063 */
1064 static int nfs_parse_mount_options(char *raw,
1065 struct nfs_parsed_mount_data *mnt)
1066 {
1067 char *p, *string, *secdata;
1068 int rc, sloppy = 0, invalid_option = 0;
1069 unsigned short protofamily = AF_UNSPEC;
1070 unsigned short mountfamily = AF_UNSPEC;
1071
1072 if (!raw) {
1073 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1074 return 1;
1075 }
1076 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1077
1078 secdata = alloc_secdata();
1079 if (!secdata)
1080 goto out_nomem;
1081
1082 rc = security_sb_copy_data(raw, secdata);
1083 if (rc)
1084 goto out_security_failure;
1085
1086 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1087 if (rc)
1088 goto out_security_failure;
1089
1090 free_secdata(secdata);
1091
1092 while ((p = strsep(&raw, ",")) != NULL) {
1093 substring_t args[MAX_OPT_ARGS];
1094 unsigned long option;
1095 int token;
1096
1097 if (!*p)
1098 continue;
1099
1100 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1101
1102 token = match_token(p, nfs_mount_option_tokens, args);
1103 switch (token) {
1104
1105 /*
1106 * boolean options: foo/nofoo
1107 */
1108 case Opt_soft:
1109 mnt->flags |= NFS_MOUNT_SOFT;
1110 break;
1111 case Opt_hard:
1112 mnt->flags &= ~NFS_MOUNT_SOFT;
1113 break;
1114 case Opt_posix:
1115 mnt->flags |= NFS_MOUNT_POSIX;
1116 break;
1117 case Opt_noposix:
1118 mnt->flags &= ~NFS_MOUNT_POSIX;
1119 break;
1120 case Opt_cto:
1121 mnt->flags &= ~NFS_MOUNT_NOCTO;
1122 break;
1123 case Opt_nocto:
1124 mnt->flags |= NFS_MOUNT_NOCTO;
1125 break;
1126 case Opt_ac:
1127 mnt->flags &= ~NFS_MOUNT_NOAC;
1128 break;
1129 case Opt_noac:
1130 mnt->flags |= NFS_MOUNT_NOAC;
1131 break;
1132 case Opt_lock:
1133 mnt->flags &= ~NFS_MOUNT_NONLM;
1134 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1135 NFS_MOUNT_LOCAL_FCNTL);
1136 break;
1137 case Opt_nolock:
1138 mnt->flags |= NFS_MOUNT_NONLM;
1139 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1140 NFS_MOUNT_LOCAL_FCNTL);
1141 break;
1142 case Opt_v2:
1143 mnt->flags &= ~NFS_MOUNT_VER3;
1144 mnt->version = 2;
1145 break;
1146 case Opt_v3:
1147 mnt->flags |= NFS_MOUNT_VER3;
1148 mnt->version = 3;
1149 break;
1150 case Opt_v4:
1151 mnt->flags &= ~NFS_MOUNT_VER3;
1152 mnt->version = 4;
1153 break;
1154 case Opt_udp:
1155 mnt->flags &= ~NFS_MOUNT_TCP;
1156 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1157 break;
1158 case Opt_tcp:
1159 mnt->flags |= NFS_MOUNT_TCP;
1160 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1161 break;
1162 case Opt_rdma:
1163 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1164 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1165 xprt_load_transport(p);
1166 break;
1167 case Opt_acl:
1168 mnt->flags &= ~NFS_MOUNT_NOACL;
1169 break;
1170 case Opt_noacl:
1171 mnt->flags |= NFS_MOUNT_NOACL;
1172 break;
1173 case Opt_rdirplus:
1174 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1175 break;
1176 case Opt_nordirplus:
1177 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1178 break;
1179 case Opt_sharecache:
1180 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1181 break;
1182 case Opt_nosharecache:
1183 mnt->flags |= NFS_MOUNT_UNSHARED;
1184 break;
1185 case Opt_resvport:
1186 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1187 break;
1188 case Opt_noresvport:
1189 mnt->flags |= NFS_MOUNT_NORESVPORT;
1190 break;
1191 case Opt_fscache:
1192 mnt->options |= NFS_OPTION_FSCACHE;
1193 kfree(mnt->fscache_uniq);
1194 mnt->fscache_uniq = NULL;
1195 break;
1196 case Opt_nofscache:
1197 mnt->options &= ~NFS_OPTION_FSCACHE;
1198 kfree(mnt->fscache_uniq);
1199 mnt->fscache_uniq = NULL;
1200 break;
1201
1202 /*
1203 * options that take numeric values
1204 */
1205 case Opt_port:
1206 if (nfs_get_option_ul(args, &option) ||
1207 option > USHRT_MAX)
1208 goto out_invalid_value;
1209 mnt->nfs_server.port = option;
1210 break;
1211 case Opt_rsize:
1212 if (nfs_get_option_ul(args, &option))
1213 goto out_invalid_value;
1214 mnt->rsize = option;
1215 break;
1216 case Opt_wsize:
1217 if (nfs_get_option_ul(args, &option))
1218 goto out_invalid_value;
1219 mnt->wsize = option;
1220 break;
1221 case Opt_bsize:
1222 if (nfs_get_option_ul(args, &option))
1223 goto out_invalid_value;
1224 mnt->bsize = option;
1225 break;
1226 case Opt_timeo:
1227 if (nfs_get_option_ul(args, &option) || option == 0)
1228 goto out_invalid_value;
1229 mnt->timeo = option;
1230 break;
1231 case Opt_retrans:
1232 if (nfs_get_option_ul(args, &option) || option == 0)
1233 goto out_invalid_value;
1234 mnt->retrans = option;
1235 break;
1236 case Opt_acregmin:
1237 if (nfs_get_option_ul(args, &option))
1238 goto out_invalid_value;
1239 mnt->acregmin = option;
1240 break;
1241 case Opt_acregmax:
1242 if (nfs_get_option_ul(args, &option))
1243 goto out_invalid_value;
1244 mnt->acregmax = option;
1245 break;
1246 case Opt_acdirmin:
1247 if (nfs_get_option_ul(args, &option))
1248 goto out_invalid_value;
1249 mnt->acdirmin = option;
1250 break;
1251 case Opt_acdirmax:
1252 if (nfs_get_option_ul(args, &option))
1253 goto out_invalid_value;
1254 mnt->acdirmax = option;
1255 break;
1256 case Opt_actimeo:
1257 if (nfs_get_option_ul(args, &option))
1258 goto out_invalid_value;
1259 mnt->acregmin = mnt->acregmax =
1260 mnt->acdirmin = mnt->acdirmax = option;
1261 break;
1262 case Opt_namelen:
1263 if (nfs_get_option_ul(args, &option))
1264 goto out_invalid_value;
1265 mnt->namlen = option;
1266 break;
1267 case Opt_mountport:
1268 if (nfs_get_option_ul(args, &option) ||
1269 option > USHRT_MAX)
1270 goto out_invalid_value;
1271 mnt->mount_server.port = option;
1272 break;
1273 case Opt_mountvers:
1274 if (nfs_get_option_ul(args, &option) ||
1275 option < NFS_MNT_VERSION ||
1276 option > NFS_MNT3_VERSION)
1277 goto out_invalid_value;
1278 mnt->mount_server.version = option;
1279 break;
1280 case Opt_nfsvers:
1281 if (nfs_get_option_ul(args, &option))
1282 goto out_invalid_value;
1283 switch (option) {
1284 case NFS2_VERSION:
1285 mnt->flags &= ~NFS_MOUNT_VER3;
1286 mnt->version = 2;
1287 break;
1288 case NFS3_VERSION:
1289 mnt->flags |= NFS_MOUNT_VER3;
1290 mnt->version = 3;
1291 break;
1292 case NFS4_VERSION:
1293 mnt->flags &= ~NFS_MOUNT_VER3;
1294 mnt->version = 4;
1295 break;
1296 default:
1297 goto out_invalid_value;
1298 }
1299 break;
1300 case Opt_minorversion:
1301 if (nfs_get_option_ul(args, &option))
1302 goto out_invalid_value;
1303 if (option > NFS4_MAX_MINOR_VERSION)
1304 goto out_invalid_value;
1305 mnt->minorversion = option;
1306 break;
1307
1308 /*
1309 * options that take text values
1310 */
1311 case Opt_sec:
1312 string = match_strdup(args);
1313 if (string == NULL)
1314 goto out_nomem;
1315 rc = nfs_parse_security_flavors(string, mnt);
1316 kfree(string);
1317 if (!rc) {
1318 dfprintk(MOUNT, "NFS: unrecognized "
1319 "security flavor\n");
1320 return 0;
1321 }
1322 break;
1323 case Opt_proto:
1324 string = match_strdup(args);
1325 if (string == NULL)
1326 goto out_nomem;
1327 token = match_token(string,
1328 nfs_xprt_protocol_tokens, args);
1329
1330 protofamily = AF_INET;
1331 switch (token) {
1332 case Opt_xprt_udp6:
1333 protofamily = AF_INET6;
1334 case Opt_xprt_udp:
1335 mnt->flags &= ~NFS_MOUNT_TCP;
1336 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1337 break;
1338 case Opt_xprt_tcp6:
1339 protofamily = AF_INET6;
1340 case Opt_xprt_tcp:
1341 mnt->flags |= NFS_MOUNT_TCP;
1342 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1343 break;
1344 case Opt_xprt_rdma:
1345 /* vector side protocols to TCP */
1346 mnt->flags |= NFS_MOUNT_TCP;
1347 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1348 xprt_load_transport(string);
1349 break;
1350 default:
1351 dfprintk(MOUNT, "NFS: unrecognized "
1352 "transport protocol\n");
1353 kfree(string);
1354 return 0;
1355 }
1356 kfree(string);
1357 break;
1358 case Opt_mountproto:
1359 string = match_strdup(args);
1360 if (string == NULL)
1361 goto out_nomem;
1362 token = match_token(string,
1363 nfs_xprt_protocol_tokens, args);
1364 kfree(string);
1365
1366 mountfamily = AF_INET;
1367 switch (token) {
1368 case Opt_xprt_udp6:
1369 mountfamily = AF_INET6;
1370 case Opt_xprt_udp:
1371 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1372 break;
1373 case Opt_xprt_tcp6:
1374 mountfamily = AF_INET6;
1375 case Opt_xprt_tcp:
1376 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1377 break;
1378 case Opt_xprt_rdma: /* not used for side protocols */
1379 default:
1380 dfprintk(MOUNT, "NFS: unrecognized "
1381 "transport protocol\n");
1382 return 0;
1383 }
1384 break;
1385 case Opt_addr:
1386 string = match_strdup(args);
1387 if (string == NULL)
1388 goto out_nomem;
1389 mnt->nfs_server.addrlen =
1390 rpc_pton(string, strlen(string),
1391 (struct sockaddr *)
1392 &mnt->nfs_server.address,
1393 sizeof(mnt->nfs_server.address));
1394 kfree(string);
1395 if (mnt->nfs_server.addrlen == 0)
1396 goto out_invalid_address;
1397 break;
1398 case Opt_clientaddr:
1399 if (nfs_get_option_str(args, &mnt->client_address))
1400 goto out_nomem;
1401 break;
1402 case Opt_mounthost:
1403 if (nfs_get_option_str(args,
1404 &mnt->mount_server.hostname))
1405 goto out_nomem;
1406 break;
1407 case Opt_mountaddr:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 mnt->mount_server.addrlen =
1412 rpc_pton(string, strlen(string),
1413 (struct sockaddr *)
1414 &mnt->mount_server.address,
1415 sizeof(mnt->mount_server.address));
1416 kfree(string);
1417 if (mnt->mount_server.addrlen == 0)
1418 goto out_invalid_address;
1419 break;
1420 case Opt_lookupcache:
1421 string = match_strdup(args);
1422 if (string == NULL)
1423 goto out_nomem;
1424 token = match_token(string,
1425 nfs_lookupcache_tokens, args);
1426 kfree(string);
1427 switch (token) {
1428 case Opt_lookupcache_all:
1429 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1430 break;
1431 case Opt_lookupcache_positive:
1432 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1433 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1434 break;
1435 case Opt_lookupcache_none:
1436 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1437 break;
1438 default:
1439 dfprintk(MOUNT, "NFS: invalid "
1440 "lookupcache argument\n");
1441 return 0;
1442 };
1443 break;
1444 case Opt_fscache_uniq:
1445 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1446 goto out_nomem;
1447 mnt->options |= NFS_OPTION_FSCACHE;
1448 break;
1449 case Opt_local_lock:
1450 string = match_strdup(args);
1451 if (string == NULL)
1452 goto out_nomem;
1453 token = match_token(string, nfs_local_lock_tokens,
1454 args);
1455 kfree(string);
1456 switch (token) {
1457 case Opt_local_lock_all:
1458 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1459 NFS_MOUNT_LOCAL_FCNTL);
1460 break;
1461 case Opt_local_lock_flock:
1462 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1463 break;
1464 case Opt_local_lock_posix:
1465 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1466 break;
1467 case Opt_local_lock_none:
1468 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1469 NFS_MOUNT_LOCAL_FCNTL);
1470 break;
1471 default:
1472 dfprintk(MOUNT, "NFS: invalid "
1473 "local_lock argument\n");
1474 return 0;
1475 };
1476 break;
1477
1478 /*
1479 * Special options
1480 */
1481 case Opt_sloppy:
1482 sloppy = 1;
1483 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1484 break;
1485 case Opt_userspace:
1486 case Opt_deprecated:
1487 dfprintk(MOUNT, "NFS: ignoring mount option "
1488 "'%s'\n", p);
1489 break;
1490
1491 default:
1492 invalid_option = 1;
1493 dfprintk(MOUNT, "NFS: unrecognized mount option "
1494 "'%s'\n", p);
1495 }
1496 }
1497
1498 if (!sloppy && invalid_option)
1499 return 0;
1500
1501 /*
1502 * verify that any proto=/mountproto= options match the address
1503 * familiies in the addr=/mountaddr= options.
1504 */
1505 if (protofamily != AF_UNSPEC &&
1506 protofamily != mnt->nfs_server.address.ss_family)
1507 goto out_proto_mismatch;
1508
1509 if (mountfamily != AF_UNSPEC) {
1510 if (mnt->mount_server.addrlen) {
1511 if (mountfamily != mnt->mount_server.address.ss_family)
1512 goto out_mountproto_mismatch;
1513 } else {
1514 if (mountfamily != mnt->nfs_server.address.ss_family)
1515 goto out_mountproto_mismatch;
1516 }
1517 }
1518
1519 return 1;
1520
1521 out_mountproto_mismatch:
1522 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1523 "option\n");
1524 return 0;
1525 out_proto_mismatch:
1526 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1527 return 0;
1528 out_invalid_address:
1529 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1530 return 0;
1531 out_invalid_value:
1532 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1533 return 0;
1534 out_nomem:
1535 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1536 return 0;
1537 out_security_failure:
1538 free_secdata(secdata);
1539 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1540 return 0;
1541 }
1542
1543 /*
1544 * Match the requested auth flavors with the list returned by
1545 * the server. Returns zero and sets the mount's authentication
1546 * flavor on success; returns -EACCES if server does not support
1547 * the requested flavor.
1548 */
1549 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1550 struct nfs_mount_request *request)
1551 {
1552 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1553
1554 /*
1555 * Certain releases of Linux's mountd return an empty
1556 * flavor list. To prevent behavioral regression with
1557 * these servers (ie. rejecting mounts that used to
1558 * succeed), revert to pre-2.6.32 behavior (no checking)
1559 * if the returned flavor list is empty.
1560 */
1561 if (server_authlist_len == 0)
1562 return 0;
1563
1564 /*
1565 * We avoid sophisticated negotiating here, as there are
1566 * plenty of cases where we can get it wrong, providing
1567 * either too little or too much security.
1568 *
1569 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1570 * flavor listed first. However, some servers list
1571 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1572 * preferred default, in args->auth_flavors[0] if user
1573 * didn't specify sec= mount option.
1574 */
1575 for (i = 0; i < args->auth_flavor_len; i++)
1576 for (j = 0; j < server_authlist_len; j++)
1577 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1578 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1579 request->auth_flavs[j]);
1580 args->auth_flavors[0] = request->auth_flavs[j];
1581 return 0;
1582 }
1583
1584 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1585 nfs_umount(request);
1586 return -EACCES;
1587 }
1588
1589 /*
1590 * Use the remote server's MOUNT service to request the NFS file handle
1591 * corresponding to the provided path.
1592 */
1593 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1594 struct nfs_fh *root_fh)
1595 {
1596 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1597 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1598 struct nfs_mount_request request = {
1599 .sap = (struct sockaddr *)
1600 &args->mount_server.address,
1601 .dirpath = args->nfs_server.export_path,
1602 .protocol = args->mount_server.protocol,
1603 .fh = root_fh,
1604 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1605 .auth_flav_len = &server_authlist_len,
1606 .auth_flavs = server_authlist,
1607 };
1608 int status;
1609
1610 if (args->mount_server.version == 0) {
1611 switch (args->version) {
1612 default:
1613 args->mount_server.version = NFS_MNT3_VERSION;
1614 break;
1615 case 2:
1616 args->mount_server.version = NFS_MNT_VERSION;
1617 }
1618 }
1619 request.version = args->mount_server.version;
1620
1621 if (args->mount_server.hostname)
1622 request.hostname = args->mount_server.hostname;
1623 else
1624 request.hostname = args->nfs_server.hostname;
1625
1626 /*
1627 * Construct the mount server's address.
1628 */
1629 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1630 memcpy(request.sap, &args->nfs_server.address,
1631 args->nfs_server.addrlen);
1632 args->mount_server.addrlen = args->nfs_server.addrlen;
1633 }
1634 request.salen = args->mount_server.addrlen;
1635 nfs_set_port(request.sap, &args->mount_server.port, 0);
1636
1637 /*
1638 * Now ask the mount server to map our export path
1639 * to a file handle.
1640 */
1641 status = nfs_mount(&request);
1642 if (status != 0) {
1643 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1644 request.hostname, status);
1645 return status;
1646 }
1647
1648 /*
1649 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1650 */
1651 if (args->mount_server.version != NFS_MNT3_VERSION)
1652 return 0;
1653 return nfs_walk_authlist(args, &request);
1654 }
1655
1656 /*
1657 * Split "dev_name" into "hostname:export_path".
1658 *
1659 * The leftmost colon demarks the split between the server's hostname
1660 * and the export path. If the hostname starts with a left square
1661 * bracket, then it may contain colons.
1662 *
1663 * Note: caller frees hostname and export path, even on error.
1664 */
1665 static int nfs_parse_devname(const char *dev_name,
1666 char **hostname, size_t maxnamlen,
1667 char **export_path, size_t maxpathlen)
1668 {
1669 size_t len;
1670 char *end;
1671
1672 /* Is the host name protected with square brakcets? */
1673 if (*dev_name == '[') {
1674 end = strchr(++dev_name, ']');
1675 if (end == NULL || end[1] != ':')
1676 goto out_bad_devname;
1677
1678 len = end - dev_name;
1679 end++;
1680 } else {
1681 char *comma;
1682
1683 end = strchr(dev_name, ':');
1684 if (end == NULL)
1685 goto out_bad_devname;
1686 len = end - dev_name;
1687
1688 /* kill possible hostname list: not supported */
1689 comma = strchr(dev_name, ',');
1690 if (comma != NULL && comma < end)
1691 *comma = 0;
1692 }
1693
1694 if (len > maxnamlen)
1695 goto out_hostname;
1696
1697 /* N.B. caller will free nfs_server.hostname in all cases */
1698 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1699 if (*hostname == NULL)
1700 goto out_nomem;
1701 len = strlen(++end);
1702 if (len > maxpathlen)
1703 goto out_path;
1704 *export_path = kstrndup(end, len, GFP_KERNEL);
1705 if (!*export_path)
1706 goto out_nomem;
1707
1708 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1709 return 0;
1710
1711 out_bad_devname:
1712 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1713 return -EINVAL;
1714
1715 out_nomem:
1716 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1717 return -ENOMEM;
1718
1719 out_hostname:
1720 dfprintk(MOUNT, "NFS: server hostname too long\n");
1721 return -ENAMETOOLONG;
1722
1723 out_path:
1724 dfprintk(MOUNT, "NFS: export pathname too long\n");
1725 return -ENAMETOOLONG;
1726 }
1727
1728 /*
1729 * Validate the NFS2/NFS3 mount data
1730 * - fills in the mount root filehandle
1731 *
1732 * For option strings, user space handles the following behaviors:
1733 *
1734 * + DNS: mapping server host name to IP address ("addr=" option)
1735 *
1736 * + failure mode: how to behave if a mount request can't be handled
1737 * immediately ("fg/bg" option)
1738 *
1739 * + retry: how often to retry a mount request ("retry=" option)
1740 *
1741 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1742 * mountproto=tcp after mountproto=udp, and so on
1743 */
1744 static int nfs_validate_mount_data(void *options,
1745 struct nfs_parsed_mount_data *args,
1746 struct nfs_fh *mntfh,
1747 const char *dev_name)
1748 {
1749 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1750 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1751
1752 if (data == NULL)
1753 goto out_no_data;
1754
1755 switch (data->version) {
1756 case 1:
1757 data->namlen = 0;
1758 case 2:
1759 data->bsize = 0;
1760 case 3:
1761 if (data->flags & NFS_MOUNT_VER3)
1762 goto out_no_v3;
1763 data->root.size = NFS2_FHSIZE;
1764 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1765 case 4:
1766 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1767 goto out_no_sec;
1768 case 5:
1769 memset(data->context, 0, sizeof(data->context));
1770 case 6:
1771 if (data->flags & NFS_MOUNT_VER3) {
1772 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1773 goto out_invalid_fh;
1774 mntfh->size = data->root.size;
1775 args->version = 3;
1776 } else {
1777 mntfh->size = NFS2_FHSIZE;
1778 args->version = 2;
1779 }
1780
1781
1782 memcpy(mntfh->data, data->root.data, mntfh->size);
1783 if (mntfh->size < sizeof(mntfh->data))
1784 memset(mntfh->data + mntfh->size, 0,
1785 sizeof(mntfh->data) - mntfh->size);
1786
1787 /*
1788 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1789 * can deal with.
1790 */
1791 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1792 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1793 args->rsize = data->rsize;
1794 args->wsize = data->wsize;
1795 args->timeo = data->timeo;
1796 args->retrans = data->retrans;
1797 args->acregmin = data->acregmin;
1798 args->acregmax = data->acregmax;
1799 args->acdirmin = data->acdirmin;
1800 args->acdirmax = data->acdirmax;
1801
1802 memcpy(sap, &data->addr, sizeof(data->addr));
1803 args->nfs_server.addrlen = sizeof(data->addr);
1804 if (!nfs_verify_server_address(sap))
1805 goto out_no_address;
1806
1807 if (!(data->flags & NFS_MOUNT_TCP))
1808 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1809 /* N.B. caller will free nfs_server.hostname in all cases */
1810 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1811 args->namlen = data->namlen;
1812 args->bsize = data->bsize;
1813
1814 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1815 args->auth_flavors[0] = data->pseudoflavor;
1816 if (!args->nfs_server.hostname)
1817 goto out_nomem;
1818
1819 if (!(data->flags & NFS_MOUNT_NONLM))
1820 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1821 NFS_MOUNT_LOCAL_FCNTL);
1822 else
1823 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1824 NFS_MOUNT_LOCAL_FCNTL);
1825 /*
1826 * The legacy version 6 binary mount data from userspace has a
1827 * field used only to transport selinux information into the
1828 * the kernel. To continue to support that functionality we
1829 * have a touch of selinux knowledge here in the NFS code. The
1830 * userspace code converted context=blah to just blah so we are
1831 * converting back to the full string selinux understands.
1832 */
1833 if (data->context[0]){
1834 #ifdef CONFIG_SECURITY_SELINUX
1835 int rc;
1836 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1837 if (!opts_str)
1838 return -ENOMEM;
1839 strcpy(opts_str, "context=");
1840 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1841 strcat(opts_str, &data->context[0]);
1842 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1843 kfree(opts_str);
1844 if (rc)
1845 return rc;
1846 #else
1847 return -EINVAL;
1848 #endif
1849 }
1850
1851 break;
1852 default: {
1853 int status;
1854
1855 if (nfs_parse_mount_options((char *)options, args) == 0)
1856 return -EINVAL;
1857
1858 if (!nfs_verify_server_address(sap))
1859 goto out_no_address;
1860
1861 if (args->version == 4)
1862 #ifdef CONFIG_NFS_V4
1863 return nfs4_validate_text_mount_data(options,
1864 args, dev_name);
1865 #else
1866 goto out_v4_not_compiled;
1867 #endif
1868
1869 nfs_set_port(sap, &args->nfs_server.port, 0);
1870
1871 nfs_set_mount_transport_protocol(args);
1872
1873 status = nfs_parse_devname(dev_name,
1874 &args->nfs_server.hostname,
1875 PAGE_SIZE,
1876 &args->nfs_server.export_path,
1877 NFS_MAXPATHLEN);
1878 if (!status)
1879 status = nfs_try_mount(args, mntfh);
1880
1881 kfree(args->nfs_server.export_path);
1882 args->nfs_server.export_path = NULL;
1883
1884 if (status)
1885 return status;
1886
1887 break;
1888 }
1889 }
1890
1891 #ifndef CONFIG_NFS_V3
1892 if (args->version == 3)
1893 goto out_v3_not_compiled;
1894 #endif /* !CONFIG_NFS_V3 */
1895
1896 return 0;
1897
1898 out_no_data:
1899 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1900 return -EINVAL;
1901
1902 out_no_v3:
1903 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1904 data->version);
1905 return -EINVAL;
1906
1907 out_no_sec:
1908 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1909 return -EINVAL;
1910
1911 #ifndef CONFIG_NFS_V3
1912 out_v3_not_compiled:
1913 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1914 return -EPROTONOSUPPORT;
1915 #endif /* !CONFIG_NFS_V3 */
1916
1917 #ifndef CONFIG_NFS_V4
1918 out_v4_not_compiled:
1919 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1920 return -EPROTONOSUPPORT;
1921 #endif /* !CONFIG_NFS_V4 */
1922
1923 out_nomem:
1924 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1925 return -ENOMEM;
1926
1927 out_no_address:
1928 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1929 return -EINVAL;
1930
1931 out_invalid_fh:
1932 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1933 return -EINVAL;
1934 }
1935
1936 static int
1937 nfs_compare_remount_data(struct nfs_server *nfss,
1938 struct nfs_parsed_mount_data *data)
1939 {
1940 if (data->flags != nfss->flags ||
1941 data->rsize != nfss->rsize ||
1942 data->wsize != nfss->wsize ||
1943 data->retrans != nfss->client->cl_timeout->to_retries ||
1944 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1945 data->acregmin != nfss->acregmin / HZ ||
1946 data->acregmax != nfss->acregmax / HZ ||
1947 data->acdirmin != nfss->acdirmin / HZ ||
1948 data->acdirmax != nfss->acdirmax / HZ ||
1949 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1950 data->nfs_server.port != nfss->port ||
1951 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1952 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1953 (struct sockaddr *)&nfss->nfs_client->cl_addr))
1954 return -EINVAL;
1955
1956 return 0;
1957 }
1958
1959 static int
1960 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1961 {
1962 int error;
1963 struct nfs_server *nfss = sb->s_fs_info;
1964 struct nfs_parsed_mount_data *data;
1965 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1966 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1967 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1968
1969 /*
1970 * Userspace mount programs that send binary options generally send
1971 * them populated with default values. We have no way to know which
1972 * ones were explicitly specified. Fall back to legacy behavior and
1973 * just return success.
1974 */
1975 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1976 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1977 options->version <= 6))))
1978 return 0;
1979
1980 data = kzalloc(sizeof(*data), GFP_KERNEL);
1981 if (data == NULL)
1982 return -ENOMEM;
1983
1984 /* fill out struct with values from existing mount */
1985 data->flags = nfss->flags;
1986 data->rsize = nfss->rsize;
1987 data->wsize = nfss->wsize;
1988 data->retrans = nfss->client->cl_timeout->to_retries;
1989 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1990 data->acregmin = nfss->acregmin / HZ;
1991 data->acregmax = nfss->acregmax / HZ;
1992 data->acdirmin = nfss->acdirmin / HZ;
1993 data->acdirmax = nfss->acdirmax / HZ;
1994 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1995 data->nfs_server.port = nfss->port;
1996 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1997 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1998 data->nfs_server.addrlen);
1999
2000 /* overwrite those values with any that were specified */
2001 error = nfs_parse_mount_options((char *)options, data);
2002 if (error < 0)
2003 goto out;
2004
2005 /*
2006 * noac is a special case. It implies -o sync, but that's not
2007 * necessarily reflected in the mtab options. do_remount_sb
2008 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2009 * remount options, so we have to explicitly reset it.
2010 */
2011 if (data->flags & NFS_MOUNT_NOAC)
2012 *flags |= MS_SYNCHRONOUS;
2013
2014 /* compare new mount options with old ones */
2015 error = nfs_compare_remount_data(nfss, data);
2016 out:
2017 kfree(data);
2018 return error;
2019 }
2020
2021 /*
2022 * Initialise the common bits of the superblock
2023 */
2024 static inline void nfs_initialise_sb(struct super_block *sb)
2025 {
2026 struct nfs_server *server = NFS_SB(sb);
2027
2028 sb->s_magic = NFS_SUPER_MAGIC;
2029
2030 /* We probably want something more informative here */
2031 snprintf(sb->s_id, sizeof(sb->s_id),
2032 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2033
2034 if (sb->s_blocksize == 0)
2035 sb->s_blocksize = nfs_block_bits(server->wsize,
2036 &sb->s_blocksize_bits);
2037
2038 if (server->flags & NFS_MOUNT_NOAC)
2039 sb->s_flags |= MS_SYNCHRONOUS;
2040
2041 sb->s_bdi = &server->backing_dev_info;
2042
2043 nfs_super_set_maxbytes(sb, server->maxfilesize);
2044 }
2045
2046 /*
2047 * Finish setting up an NFS2/3 superblock
2048 */
2049 static void nfs_fill_super(struct super_block *sb,
2050 struct nfs_parsed_mount_data *data)
2051 {
2052 struct nfs_server *server = NFS_SB(sb);
2053
2054 sb->s_blocksize_bits = 0;
2055 sb->s_blocksize = 0;
2056 if (data->bsize)
2057 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2058
2059 if (server->nfs_client->rpc_ops->version == 3) {
2060 /* The VFS shouldn't apply the umask to mode bits. We will do
2061 * so ourselves when necessary.
2062 */
2063 sb->s_flags |= MS_POSIXACL;
2064 sb->s_time_gran = 1;
2065 }
2066
2067 sb->s_op = &nfs_sops;
2068 nfs_initialise_sb(sb);
2069 }
2070
2071 /*
2072 * Finish setting up a cloned NFS2/3 superblock
2073 */
2074 static void nfs_clone_super(struct super_block *sb,
2075 const struct super_block *old_sb)
2076 {
2077 struct nfs_server *server = NFS_SB(sb);
2078
2079 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2080 sb->s_blocksize = old_sb->s_blocksize;
2081 sb->s_maxbytes = old_sb->s_maxbytes;
2082
2083 if (server->nfs_client->rpc_ops->version == 3) {
2084 /* The VFS shouldn't apply the umask to mode bits. We will do
2085 * so ourselves when necessary.
2086 */
2087 sb->s_flags |= MS_POSIXACL;
2088 sb->s_time_gran = 1;
2089 }
2090
2091 sb->s_op = old_sb->s_op;
2092 nfs_initialise_sb(sb);
2093 }
2094
2095 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2096 {
2097 const struct nfs_server *a = s->s_fs_info;
2098 const struct rpc_clnt *clnt_a = a->client;
2099 const struct rpc_clnt *clnt_b = b->client;
2100
2101 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2102 goto Ebusy;
2103 if (a->nfs_client != b->nfs_client)
2104 goto Ebusy;
2105 if (a->flags != b->flags)
2106 goto Ebusy;
2107 if (a->wsize != b->wsize)
2108 goto Ebusy;
2109 if (a->rsize != b->rsize)
2110 goto Ebusy;
2111 if (a->acregmin != b->acregmin)
2112 goto Ebusy;
2113 if (a->acregmax != b->acregmax)
2114 goto Ebusy;
2115 if (a->acdirmin != b->acdirmin)
2116 goto Ebusy;
2117 if (a->acdirmax != b->acdirmax)
2118 goto Ebusy;
2119 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2120 goto Ebusy;
2121 return 1;
2122 Ebusy:
2123 return 0;
2124 }
2125
2126 struct nfs_sb_mountdata {
2127 struct nfs_server *server;
2128 int mntflags;
2129 };
2130
2131 static int nfs_set_super(struct super_block *s, void *data)
2132 {
2133 struct nfs_sb_mountdata *sb_mntdata = data;
2134 struct nfs_server *server = sb_mntdata->server;
2135 int ret;
2136
2137 s->s_flags = sb_mntdata->mntflags;
2138 s->s_fs_info = server;
2139 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2140 ret = set_anon_super(s, server);
2141 if (ret == 0)
2142 server->s_dev = s->s_dev;
2143 return ret;
2144 }
2145
2146 static int nfs_compare_super_address(struct nfs_server *server1,
2147 struct nfs_server *server2)
2148 {
2149 struct sockaddr *sap1, *sap2;
2150
2151 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2152 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2153
2154 if (sap1->sa_family != sap2->sa_family)
2155 return 0;
2156
2157 switch (sap1->sa_family) {
2158 case AF_INET: {
2159 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2160 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2161 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2162 return 0;
2163 if (sin1->sin_port != sin2->sin_port)
2164 return 0;
2165 break;
2166 }
2167 case AF_INET6: {
2168 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2169 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2170 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2171 return 0;
2172 if (sin1->sin6_port != sin2->sin6_port)
2173 return 0;
2174 break;
2175 }
2176 default:
2177 return 0;
2178 }
2179
2180 return 1;
2181 }
2182
2183 static int nfs_compare_super(struct super_block *sb, void *data)
2184 {
2185 struct nfs_sb_mountdata *sb_mntdata = data;
2186 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2187 int mntflags = sb_mntdata->mntflags;
2188
2189 if (!nfs_compare_super_address(old, server))
2190 return 0;
2191 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2192 if (old->flags & NFS_MOUNT_UNSHARED)
2193 return 0;
2194 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2195 return 0;
2196 return nfs_compare_mount_options(sb, server, mntflags);
2197 }
2198
2199 static int nfs_bdi_register(struct nfs_server *server)
2200 {
2201 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2202 }
2203
2204 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2205 int flags, const char *dev_name, void *raw_data)
2206 {
2207 struct nfs_server *server = NULL;
2208 struct super_block *s;
2209 struct nfs_parsed_mount_data *data;
2210 struct nfs_fh *mntfh;
2211 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2212 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2213 struct nfs_sb_mountdata sb_mntdata = {
2214 .mntflags = flags,
2215 };
2216 int error;
2217
2218 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2219 mntfh = nfs_alloc_fhandle();
2220 if (data == NULL || mntfh == NULL)
2221 goto out_free_fh;
2222
2223 security_init_mnt_opts(&data->lsm_opts);
2224
2225 /* Validate the mount data */
2226 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2227 if (error < 0) {
2228 mntroot = ERR_PTR(error);
2229 goto out;
2230 }
2231
2232 #ifdef CONFIG_NFS_V4
2233 if (data->version == 4) {
2234 mntroot = nfs4_try_mount(flags, dev_name, data);
2235 kfree(data->client_address);
2236 kfree(data->nfs_server.export_path);
2237 goto out;
2238 }
2239 #endif /* CONFIG_NFS_V4 */
2240
2241 /* Get a volume representation */
2242 server = nfs_create_server(data, mntfh);
2243 if (IS_ERR(server)) {
2244 mntroot = ERR_CAST(server);
2245 goto out;
2246 }
2247 sb_mntdata.server = server;
2248
2249 if (server->flags & NFS_MOUNT_UNSHARED)
2250 compare_super = NULL;
2251
2252 /* Get a superblock - note that we may end up sharing one that already exists */
2253 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2254 if (IS_ERR(s)) {
2255 mntroot = ERR_CAST(s);
2256 goto out_err_nosb;
2257 }
2258
2259 if (s->s_fs_info != server) {
2260 nfs_free_server(server);
2261 server = NULL;
2262 } else {
2263 error = nfs_bdi_register(server);
2264 if (error) {
2265 mntroot = ERR_PTR(error);
2266 goto error_splat_bdi;
2267 }
2268 }
2269
2270 if (!s->s_root) {
2271 /* initial superblock/root creation */
2272 nfs_fill_super(s, data);
2273 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
2274 }
2275
2276 mntroot = nfs_get_root(s, mntfh, dev_name);
2277 if (IS_ERR(mntroot))
2278 goto error_splat_super;
2279
2280 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2281 if (error)
2282 goto error_splat_root;
2283
2284 s->s_flags |= MS_ACTIVE;
2285
2286 out:
2287 kfree(data->nfs_server.hostname);
2288 kfree(data->mount_server.hostname);
2289 kfree(data->fscache_uniq);
2290 security_free_mnt_opts(&data->lsm_opts);
2291 out_free_fh:
2292 nfs_free_fhandle(mntfh);
2293 kfree(data);
2294 return mntroot;
2295
2296 out_err_nosb:
2297 nfs_free_server(server);
2298 goto out;
2299
2300 error_splat_root:
2301 dput(mntroot);
2302 mntroot = ERR_PTR(error);
2303 error_splat_super:
2304 if (server && !s->s_root)
2305 bdi_unregister(&server->backing_dev_info);
2306 error_splat_bdi:
2307 deactivate_locked_super(s);
2308 goto out;
2309 }
2310
2311 /*
2312 * Ensure that we unregister the bdi before kill_anon_super
2313 * releases the device name
2314 */
2315 static void nfs_put_super(struct super_block *s)
2316 {
2317 struct nfs_server *server = NFS_SB(s);
2318
2319 bdi_unregister(&server->backing_dev_info);
2320 }
2321
2322 /*
2323 * Destroy an NFS2/3 superblock
2324 */
2325 static void nfs_kill_super(struct super_block *s)
2326 {
2327 struct nfs_server *server = NFS_SB(s);
2328
2329 kill_anon_super(s);
2330 nfs_fscache_release_super_cookie(s);
2331 nfs_free_server(server);
2332 }
2333
2334 /*
2335 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2336 */
2337 static struct dentry *
2338 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2339 const char *dev_name, void *raw_data)
2340 {
2341 struct nfs_clone_mount *data = raw_data;
2342 struct super_block *s;
2343 struct nfs_server *server;
2344 struct dentry *mntroot;
2345 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2346 struct nfs_sb_mountdata sb_mntdata = {
2347 .mntflags = flags,
2348 };
2349 int error;
2350
2351 dprintk("--> nfs_xdev_mount()\n");
2352
2353 /* create a new volume representation */
2354 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2355 if (IS_ERR(server)) {
2356 error = PTR_ERR(server);
2357 goto out_err_noserver;
2358 }
2359 sb_mntdata.server = server;
2360
2361 if (server->flags & NFS_MOUNT_UNSHARED)
2362 compare_super = NULL;
2363
2364 /* Get a superblock - note that we may end up sharing one that already exists */
2365 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2366 if (IS_ERR(s)) {
2367 error = PTR_ERR(s);
2368 goto out_err_nosb;
2369 }
2370
2371 if (s->s_fs_info != server) {
2372 nfs_free_server(server);
2373 server = NULL;
2374 } else {
2375 error = nfs_bdi_register(server);
2376 if (error)
2377 goto error_splat_bdi;
2378 }
2379
2380 if (!s->s_root) {
2381 /* initial superblock/root creation */
2382 nfs_clone_super(s, data->sb);
2383 nfs_fscache_get_super_cookie(s, NULL, data);
2384 }
2385
2386 mntroot = nfs_get_root(s, data->fh, dev_name);
2387 if (IS_ERR(mntroot)) {
2388 error = PTR_ERR(mntroot);
2389 goto error_splat_super;
2390 }
2391 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2392 dput(mntroot);
2393 error = -ESTALE;
2394 goto error_splat_super;
2395 }
2396
2397 s->s_flags |= MS_ACTIVE;
2398
2399 /* clone any lsm security options from the parent to the new sb */
2400 security_sb_clone_mnt_opts(data->sb, s);
2401
2402 dprintk("<-- nfs_xdev_mount() = 0\n");
2403 return mntroot;
2404
2405 out_err_nosb:
2406 nfs_free_server(server);
2407 out_err_noserver:
2408 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2409 return ERR_PTR(error);
2410
2411 error_splat_super:
2412 if (server && !s->s_root)
2413 bdi_unregister(&server->backing_dev_info);
2414 error_splat_bdi:
2415 deactivate_locked_super(s);
2416 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2417 return ERR_PTR(error);
2418 }
2419
2420 #ifdef CONFIG_NFS_V4
2421
2422 /*
2423 * Finish setting up a cloned NFS4 superblock
2424 */
2425 static void nfs4_clone_super(struct super_block *sb,
2426 const struct super_block *old_sb)
2427 {
2428 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2429 sb->s_blocksize = old_sb->s_blocksize;
2430 sb->s_maxbytes = old_sb->s_maxbytes;
2431 sb->s_time_gran = 1;
2432 sb->s_op = old_sb->s_op;
2433 /*
2434 * The VFS shouldn't apply the umask to mode bits. We will do
2435 * so ourselves when necessary.
2436 */
2437 sb->s_flags |= MS_POSIXACL;
2438 sb->s_xattr = old_sb->s_xattr;
2439 nfs_initialise_sb(sb);
2440 }
2441
2442 /*
2443 * Set up an NFS4 superblock
2444 */
2445 static void nfs4_fill_super(struct super_block *sb)
2446 {
2447 sb->s_time_gran = 1;
2448 sb->s_op = &nfs4_sops;
2449 /*
2450 * The VFS shouldn't apply the umask to mode bits. We will do
2451 * so ourselves when necessary.
2452 */
2453 sb->s_flags |= MS_POSIXACL;
2454 sb->s_xattr = nfs4_xattr_handlers;
2455 nfs_initialise_sb(sb);
2456 }
2457
2458 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2459 {
2460 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2461 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2462 }
2463
2464 static int nfs4_validate_text_mount_data(void *options,
2465 struct nfs_parsed_mount_data *args,
2466 const char *dev_name)
2467 {
2468 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2469
2470 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2471
2472 nfs_validate_transport_protocol(args);
2473
2474 nfs4_validate_mount_flags(args);
2475
2476 if (args->version != 4) {
2477 dfprintk(MOUNT,
2478 "NFS4: Illegal mount version\n");
2479 return -EINVAL;
2480 }
2481
2482 if (args->auth_flavor_len > 1) {
2483 dfprintk(MOUNT,
2484 "NFS4: Too many RPC auth flavours specified\n");
2485 return -EINVAL;
2486 }
2487
2488 if (args->client_address == NULL) {
2489 dfprintk(MOUNT,
2490 "NFS4: mount program didn't pass callback address\n");
2491 return -EINVAL;
2492 }
2493
2494 return nfs_parse_devname(dev_name,
2495 &args->nfs_server.hostname,
2496 NFS4_MAXNAMLEN,
2497 &args->nfs_server.export_path,
2498 NFS4_MAXPATHLEN);
2499 }
2500
2501 /*
2502 * Validate NFSv4 mount options
2503 */
2504 static int nfs4_validate_mount_data(void *options,
2505 struct nfs_parsed_mount_data *args,
2506 const char *dev_name)
2507 {
2508 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2509 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2510 char *c;
2511
2512 if (data == NULL)
2513 goto out_no_data;
2514
2515 switch (data->version) {
2516 case 1:
2517 if (data->host_addrlen > sizeof(args->nfs_server.address))
2518 goto out_no_address;
2519 if (data->host_addrlen == 0)
2520 goto out_no_address;
2521 args->nfs_server.addrlen = data->host_addrlen;
2522 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2523 return -EFAULT;
2524 if (!nfs_verify_server_address(sap))
2525 goto out_no_address;
2526
2527 if (data->auth_flavourlen) {
2528 if (data->auth_flavourlen > 1)
2529 goto out_inval_auth;
2530 if (copy_from_user(&args->auth_flavors[0],
2531 data->auth_flavours,
2532 sizeof(args->auth_flavors[0])))
2533 return -EFAULT;
2534 }
2535
2536 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2537 if (IS_ERR(c))
2538 return PTR_ERR(c);
2539 args->nfs_server.hostname = c;
2540
2541 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2542 if (IS_ERR(c))
2543 return PTR_ERR(c);
2544 args->nfs_server.export_path = c;
2545 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2546
2547 c = strndup_user(data->client_addr.data, 16);
2548 if (IS_ERR(c))
2549 return PTR_ERR(c);
2550 args->client_address = c;
2551
2552 /*
2553 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2554 * can deal with.
2555 */
2556
2557 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2558 args->rsize = data->rsize;
2559 args->wsize = data->wsize;
2560 args->timeo = data->timeo;
2561 args->retrans = data->retrans;
2562 args->acregmin = data->acregmin;
2563 args->acregmax = data->acregmax;
2564 args->acdirmin = data->acdirmin;
2565 args->acdirmax = data->acdirmax;
2566 args->nfs_server.protocol = data->proto;
2567 nfs_validate_transport_protocol(args);
2568
2569 break;
2570 default:
2571 if (nfs_parse_mount_options((char *)options, args) == 0)
2572 return -EINVAL;
2573
2574 if (!nfs_verify_server_address(sap))
2575 return -EINVAL;
2576
2577 return nfs4_validate_text_mount_data(options, args, dev_name);
2578 }
2579
2580 return 0;
2581
2582 out_no_data:
2583 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2584 return -EINVAL;
2585
2586 out_inval_auth:
2587 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2588 data->auth_flavourlen);
2589 return -EINVAL;
2590
2591 out_no_address:
2592 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2593 return -EINVAL;
2594 }
2595
2596 /*
2597 * Get the superblock for the NFS4 root partition
2598 */
2599 static struct dentry *
2600 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2601 const char *dev_name, void *raw_data)
2602 {
2603 struct nfs_parsed_mount_data *data = raw_data;
2604 struct super_block *s;
2605 struct nfs_server *server;
2606 struct nfs_fh *mntfh;
2607 struct dentry *mntroot;
2608 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2609 struct nfs_sb_mountdata sb_mntdata = {
2610 .mntflags = flags,
2611 };
2612 int error = -ENOMEM;
2613
2614 mntfh = nfs_alloc_fhandle();
2615 if (data == NULL || mntfh == NULL)
2616 goto out_free_fh;
2617
2618 security_init_mnt_opts(&data->lsm_opts);
2619
2620 /* Get a volume representation */
2621 server = nfs4_create_server(data, mntfh);
2622 if (IS_ERR(server)) {
2623 error = PTR_ERR(server);
2624 goto out;
2625 }
2626 sb_mntdata.server = server;
2627
2628 if (server->flags & NFS4_MOUNT_UNSHARED)
2629 compare_super = NULL;
2630
2631 /* Get a superblock - note that we may end up sharing one that already exists */
2632 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2633 if (IS_ERR(s)) {
2634 error = PTR_ERR(s);
2635 goto out_free;
2636 }
2637
2638 if (s->s_fs_info != server) {
2639 nfs_free_server(server);
2640 server = NULL;
2641 } else {
2642 error = nfs_bdi_register(server);
2643 if (error)
2644 goto error_splat_bdi;
2645 }
2646
2647 if (!s->s_root) {
2648 /* initial superblock/root creation */
2649 nfs4_fill_super(s);
2650 nfs_fscache_get_super_cookie(
2651 s, data ? data->fscache_uniq : NULL, NULL);
2652 }
2653
2654 mntroot = nfs4_get_root(s, mntfh, dev_name);
2655 if (IS_ERR(mntroot)) {
2656 error = PTR_ERR(mntroot);
2657 goto error_splat_super;
2658 }
2659
2660 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2661 if (error)
2662 goto error_splat_root;
2663
2664 s->s_flags |= MS_ACTIVE;
2665
2666 security_free_mnt_opts(&data->lsm_opts);
2667 nfs_free_fhandle(mntfh);
2668 return mntroot;
2669
2670 out:
2671 security_free_mnt_opts(&data->lsm_opts);
2672 out_free_fh:
2673 nfs_free_fhandle(mntfh);
2674 return ERR_PTR(error);
2675
2676 out_free:
2677 nfs_free_server(server);
2678 goto out;
2679
2680 error_splat_root:
2681 dput(mntroot);
2682 error_splat_super:
2683 if (server && !s->s_root)
2684 bdi_unregister(&server->backing_dev_info);
2685 error_splat_bdi:
2686 deactivate_locked_super(s);
2687 goto out;
2688 }
2689
2690 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2691 int flags, void *data, const char *hostname)
2692 {
2693 struct vfsmount *root_mnt;
2694 char *root_devname;
2695 size_t len;
2696
2697 len = strlen(hostname) + 3;
2698 root_devname = kmalloc(len, GFP_KERNEL);
2699 if (root_devname == NULL)
2700 return ERR_PTR(-ENOMEM);
2701 snprintf(root_devname, len, "%s:/", hostname);
2702 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2703 kfree(root_devname);
2704 return root_mnt;
2705 }
2706
2707 struct nfs_referral_count {
2708 struct list_head list;
2709 const struct task_struct *task;
2710 unsigned int referral_count;
2711 };
2712
2713 static LIST_HEAD(nfs_referral_count_list);
2714 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2715
2716 static struct nfs_referral_count *nfs_find_referral_count(void)
2717 {
2718 struct nfs_referral_count *p;
2719
2720 list_for_each_entry(p, &nfs_referral_count_list, list) {
2721 if (p->task == current)
2722 return p;
2723 }
2724 return NULL;
2725 }
2726
2727 #define NFS_MAX_NESTED_REFERRALS 2
2728
2729 static int nfs_referral_loop_protect(void)
2730 {
2731 struct nfs_referral_count *p, *new;
2732 int ret = -ENOMEM;
2733
2734 new = kmalloc(sizeof(*new), GFP_KERNEL);
2735 if (!new)
2736 goto out;
2737 new->task = current;
2738 new->referral_count = 1;
2739
2740 ret = 0;
2741 spin_lock(&nfs_referral_count_list_lock);
2742 p = nfs_find_referral_count();
2743 if (p != NULL) {
2744 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2745 ret = -ELOOP;
2746 else
2747 p->referral_count++;
2748 } else {
2749 list_add(&new->list, &nfs_referral_count_list);
2750 new = NULL;
2751 }
2752 spin_unlock(&nfs_referral_count_list_lock);
2753 kfree(new);
2754 out:
2755 return ret;
2756 }
2757
2758 static void nfs_referral_loop_unprotect(void)
2759 {
2760 struct nfs_referral_count *p;
2761
2762 spin_lock(&nfs_referral_count_list_lock);
2763 p = nfs_find_referral_count();
2764 p->referral_count--;
2765 if (p->referral_count == 0)
2766 list_del(&p->list);
2767 else
2768 p = NULL;
2769 spin_unlock(&nfs_referral_count_list_lock);
2770 kfree(p);
2771 }
2772
2773 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2774 const char *export_path)
2775 {
2776 struct mnt_namespace *ns_private;
2777 struct super_block *s;
2778 struct dentry *dentry;
2779 struct path path;
2780 int ret;
2781
2782 ns_private = create_mnt_ns(root_mnt);
2783 ret = PTR_ERR(ns_private);
2784 if (IS_ERR(ns_private))
2785 goto out_mntput;
2786
2787 ret = nfs_referral_loop_protect();
2788 if (ret != 0)
2789 goto out_put_mnt_ns;
2790
2791 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2792 export_path, LOOKUP_FOLLOW, &path);
2793
2794 nfs_referral_loop_unprotect();
2795 put_mnt_ns(ns_private);
2796
2797 if (ret != 0)
2798 goto out_err;
2799
2800 s = path.mnt->mnt_sb;
2801 atomic_inc(&s->s_active);
2802 dentry = dget(path.dentry);
2803
2804 path_put(&path);
2805 down_write(&s->s_umount);
2806 return dentry;
2807 out_put_mnt_ns:
2808 put_mnt_ns(ns_private);
2809 out_mntput:
2810 mntput(root_mnt);
2811 out_err:
2812 return ERR_PTR(ret);
2813 }
2814
2815 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2816 struct nfs_parsed_mount_data *data)
2817 {
2818 char *export_path;
2819 struct vfsmount *root_mnt;
2820 struct dentry *res;
2821
2822 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2823
2824 export_path = data->nfs_server.export_path;
2825 data->nfs_server.export_path = "/";
2826 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2827 data->nfs_server.hostname);
2828 data->nfs_server.export_path = export_path;
2829
2830 res = ERR_CAST(root_mnt);
2831 if (!IS_ERR(root_mnt))
2832 res = nfs_follow_remote_path(root_mnt, export_path);
2833
2834 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2835 IS_ERR(res) ? PTR_ERR(res) : 0,
2836 IS_ERR(res) ? " [error]" : "");
2837 return res;
2838 }
2839
2840 /*
2841 * Get the superblock for an NFS4 mountpoint
2842 */
2843 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2844 int flags, const char *dev_name, void *raw_data)
2845 {
2846 struct nfs_parsed_mount_data *data;
2847 int error = -ENOMEM;
2848 struct dentry *res = ERR_PTR(-ENOMEM);
2849
2850 data = nfs_alloc_parsed_mount_data(4);
2851 if (data == NULL)
2852 goto out_free_data;
2853
2854 /* Validate the mount data */
2855 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2856 if (error < 0) {
2857 res = ERR_PTR(error);
2858 goto out;
2859 }
2860
2861 res = nfs4_try_mount(flags, dev_name, data);
2862 if (IS_ERR(res))
2863 error = PTR_ERR(res);
2864
2865 out:
2866 kfree(data->client_address);
2867 kfree(data->nfs_server.export_path);
2868 kfree(data->nfs_server.hostname);
2869 kfree(data->fscache_uniq);
2870 out_free_data:
2871 kfree(data);
2872 dprintk("<-- nfs4_mount() = %d%s\n", error,
2873 error != 0 ? " [error]" : "");
2874 return res;
2875 }
2876
2877 static void nfs4_kill_super(struct super_block *sb)
2878 {
2879 struct nfs_server *server = NFS_SB(sb);
2880
2881 dprintk("--> %s\n", __func__);
2882 nfs_super_return_all_delegations(sb);
2883 kill_anon_super(sb);
2884 nfs_fscache_release_super_cookie(sb);
2885 nfs_free_server(server);
2886 dprintk("<-- %s\n", __func__);
2887 }
2888
2889 /*
2890 * Clone an NFS4 server record on xdev traversal (FSID-change)
2891 */
2892 static struct dentry *
2893 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2894 const char *dev_name, void *raw_data)
2895 {
2896 struct nfs_clone_mount *data = raw_data;
2897 struct super_block *s;
2898 struct nfs_server *server;
2899 struct dentry *mntroot;
2900 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2901 struct nfs_sb_mountdata sb_mntdata = {
2902 .mntflags = flags,
2903 };
2904 int error;
2905
2906 dprintk("--> nfs4_xdev_mount()\n");
2907
2908 /* create a new volume representation */
2909 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2910 if (IS_ERR(server)) {
2911 error = PTR_ERR(server);
2912 goto out_err_noserver;
2913 }
2914 sb_mntdata.server = server;
2915
2916 if (server->flags & NFS4_MOUNT_UNSHARED)
2917 compare_super = NULL;
2918
2919 /* Get a superblock - note that we may end up sharing one that already exists */
2920 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2921 if (IS_ERR(s)) {
2922 error = PTR_ERR(s);
2923 goto out_err_nosb;
2924 }
2925
2926 if (s->s_fs_info != server) {
2927 nfs_free_server(server);
2928 server = NULL;
2929 } else {
2930 error = nfs_bdi_register(server);
2931 if (error)
2932 goto error_splat_bdi;
2933 }
2934
2935 if (!s->s_root) {
2936 /* initial superblock/root creation */
2937 nfs4_clone_super(s, data->sb);
2938 nfs_fscache_get_super_cookie(s, NULL, data);
2939 }
2940
2941 mntroot = nfs4_get_root(s, data->fh, dev_name);
2942 if (IS_ERR(mntroot)) {
2943 error = PTR_ERR(mntroot);
2944 goto error_splat_super;
2945 }
2946 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2947 dput(mntroot);
2948 error = -ESTALE;
2949 goto error_splat_super;
2950 }
2951
2952 s->s_flags |= MS_ACTIVE;
2953
2954 security_sb_clone_mnt_opts(data->sb, s);
2955
2956 dprintk("<-- nfs4_xdev_mount() = 0\n");
2957 return mntroot;
2958
2959 out_err_nosb:
2960 nfs_free_server(server);
2961 out_err_noserver:
2962 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2963 return ERR_PTR(error);
2964
2965 error_splat_super:
2966 if (server && !s->s_root)
2967 bdi_unregister(&server->backing_dev_info);
2968 error_splat_bdi:
2969 deactivate_locked_super(s);
2970 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2971 return ERR_PTR(error);
2972 }
2973
2974 static struct dentry *
2975 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2976 const char *dev_name, void *raw_data)
2977 {
2978 struct nfs_clone_mount *data = raw_data;
2979 struct super_block *s;
2980 struct nfs_server *server;
2981 struct dentry *mntroot;
2982 struct nfs_fh *mntfh;
2983 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2984 struct nfs_sb_mountdata sb_mntdata = {
2985 .mntflags = flags,
2986 };
2987 int error = -ENOMEM;
2988
2989 dprintk("--> nfs4_referral_get_sb()\n");
2990
2991 mntfh = nfs_alloc_fhandle();
2992 if (mntfh == NULL)
2993 goto out_err_nofh;
2994
2995 /* create a new volume representation */
2996 server = nfs4_create_referral_server(data, mntfh);
2997 if (IS_ERR(server)) {
2998 error = PTR_ERR(server);
2999 goto out_err_noserver;
3000 }
3001 sb_mntdata.server = server;
3002
3003 if (server->flags & NFS4_MOUNT_UNSHARED)
3004 compare_super = NULL;
3005
3006 /* Get a superblock - note that we may end up sharing one that already exists */
3007 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3008 if (IS_ERR(s)) {
3009 error = PTR_ERR(s);
3010 goto out_err_nosb;
3011 }
3012
3013 if (s->s_fs_info != server) {
3014 nfs_free_server(server);
3015 server = NULL;
3016 } else {
3017 error = nfs_bdi_register(server);
3018 if (error)
3019 goto error_splat_bdi;
3020 }
3021
3022 if (!s->s_root) {
3023 /* initial superblock/root creation */
3024 nfs4_fill_super(s);
3025 nfs_fscache_get_super_cookie(s, NULL, data);
3026 }
3027
3028 mntroot = nfs4_get_root(s, mntfh, dev_name);
3029 if (IS_ERR(mntroot)) {
3030 error = PTR_ERR(mntroot);
3031 goto error_splat_super;
3032 }
3033 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3034 dput(mntroot);
3035 error = -ESTALE;
3036 goto error_splat_super;
3037 }
3038
3039 s->s_flags |= MS_ACTIVE;
3040
3041 security_sb_clone_mnt_opts(data->sb, s);
3042
3043 nfs_free_fhandle(mntfh);
3044 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3045 return mntroot;
3046
3047 out_err_nosb:
3048 nfs_free_server(server);
3049 out_err_noserver:
3050 nfs_free_fhandle(mntfh);
3051 out_err_nofh:
3052 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3053 return ERR_PTR(error);
3054
3055 error_splat_super:
3056 if (server && !s->s_root)
3057 bdi_unregister(&server->backing_dev_info);
3058 error_splat_bdi:
3059 deactivate_locked_super(s);
3060 nfs_free_fhandle(mntfh);
3061 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3062 return ERR_PTR(error);
3063 }
3064
3065 /*
3066 * Create an NFS4 server record on referral traversal
3067 */
3068 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3069 int flags, const char *dev_name, void *raw_data)
3070 {
3071 struct nfs_clone_mount *data = raw_data;
3072 char *export_path;
3073 struct vfsmount *root_mnt;
3074 struct dentry *res;
3075
3076 dprintk("--> nfs4_referral_mount()\n");
3077
3078 export_path = data->mnt_path;
3079 data->mnt_path = "/";
3080
3081 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3082 flags, data, data->hostname);
3083 data->mnt_path = export_path;
3084
3085 res = ERR_CAST(root_mnt);
3086 if (!IS_ERR(root_mnt))
3087 res = nfs_follow_remote_path(root_mnt, export_path);
3088 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3089 IS_ERR(res) ? PTR_ERR(res) : 0,
3090 IS_ERR(res) ? " [error]" : "");
3091 return res;
3092 }
3093
3094 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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