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mm/memory_hotplug.c: make scan_lru_pages() static
[linux-2.6/next.git] / fs / nfs / super.c
blob3600ec700d583356d7e765db1c3a7035d3b2355c
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 Opt_local_lock,
104
105 /* Special mount options */
106 Opt_userspace, Opt_deprecated, Opt_sloppy,
107
108 Opt_err
109 };
110
111 static const match_table_t nfs_mount_option_tokens = {
112 { Opt_userspace, "bg" },
113 { Opt_userspace, "fg" },
114 { Opt_userspace, "retry=%s" },
115
116 { Opt_sloppy, "sloppy" },
117
118 { Opt_soft, "soft" },
119 { Opt_hard, "hard" },
120 { Opt_deprecated, "intr" },
121 { Opt_deprecated, "nointr" },
122 { Opt_posix, "posix" },
123 { Opt_noposix, "noposix" },
124 { Opt_cto, "cto" },
125 { Opt_nocto, "nocto" },
126 { Opt_ac, "ac" },
127 { Opt_noac, "noac" },
128 { Opt_lock, "lock" },
129 { Opt_nolock, "nolock" },
130 { Opt_v2, "v2" },
131 { Opt_v3, "v3" },
132 { Opt_v4, "v4" },
133 { Opt_udp, "udp" },
134 { Opt_tcp, "tcp" },
135 { Opt_rdma, "rdma" },
136 { Opt_acl, "acl" },
137 { Opt_noacl, "noacl" },
138 { Opt_rdirplus, "rdirplus" },
139 { Opt_nordirplus, "nordirplus" },
140 { Opt_sharecache, "sharecache" },
141 { Opt_nosharecache, "nosharecache" },
142 { Opt_resvport, "resvport" },
143 { Opt_noresvport, "noresvport" },
144 { Opt_fscache, "fsc" },
145 { Opt_nofscache, "nofsc" },
146
147 { Opt_port, "port=%s" },
148 { Opt_rsize, "rsize=%s" },
149 { Opt_wsize, "wsize=%s" },
150 { Opt_bsize, "bsize=%s" },
151 { Opt_timeo, "timeo=%s" },
152 { Opt_retrans, "retrans=%s" },
153 { Opt_acregmin, "acregmin=%s" },
154 { Opt_acregmax, "acregmax=%s" },
155 { Opt_acdirmin, "acdirmin=%s" },
156 { Opt_acdirmax, "acdirmax=%s" },
157 { Opt_actimeo, "actimeo=%s" },
158 { Opt_namelen, "namlen=%s" },
159 { Opt_mountport, "mountport=%s" },
160 { Opt_mountvers, "mountvers=%s" },
161 { Opt_nfsvers, "nfsvers=%s" },
162 { Opt_nfsvers, "vers=%s" },
163 { Opt_minorversion, "minorversion=%s" },
164
165 { Opt_sec, "sec=%s" },
166 { Opt_proto, "proto=%s" },
167 { Opt_mountproto, "mountproto=%s" },
168 { Opt_addr, "addr=%s" },
169 { Opt_clientaddr, "clientaddr=%s" },
170 { Opt_mounthost, "mounthost=%s" },
171 { Opt_mountaddr, "mountaddr=%s" },
172
173 { Opt_lookupcache, "lookupcache=%s" },
174 { Opt_fscache_uniq, "fsc=%s" },
175 { Opt_local_lock, "local_lock=%s" },
176
177 { Opt_err, NULL }
178 };
179
180 enum {
181 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
182
183 Opt_xprt_err
184 };
185
186 static const match_table_t nfs_xprt_protocol_tokens = {
187 { Opt_xprt_udp, "udp" },
188 { Opt_xprt_udp6, "udp6" },
189 { Opt_xprt_tcp, "tcp" },
190 { Opt_xprt_tcp6, "tcp6" },
191 { Opt_xprt_rdma, "rdma" },
192
193 { Opt_xprt_err, NULL }
194 };
195
196 enum {
197 Opt_sec_none, Opt_sec_sys,
198 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
199 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
200 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
201
202 Opt_sec_err
203 };
204
205 static const match_table_t nfs_secflavor_tokens = {
206 { Opt_sec_none, "none" },
207 { Opt_sec_none, "null" },
208 { Opt_sec_sys, "sys" },
209
210 { Opt_sec_krb5, "krb5" },
211 { Opt_sec_krb5i, "krb5i" },
212 { Opt_sec_krb5p, "krb5p" },
213
214 { Opt_sec_lkey, "lkey" },
215 { Opt_sec_lkeyi, "lkeyi" },
216 { Opt_sec_lkeyp, "lkeyp" },
217
218 { Opt_sec_spkm, "spkm3" },
219 { Opt_sec_spkmi, "spkm3i" },
220 { Opt_sec_spkmp, "spkm3p" },
221
222 { Opt_sec_err, NULL }
223 };
224
225 enum {
226 Opt_lookupcache_all, Opt_lookupcache_positive,
227 Opt_lookupcache_none,
228
229 Opt_lookupcache_err
230 };
231
232 static match_table_t nfs_lookupcache_tokens = {
233 { Opt_lookupcache_all, "all" },
234 { Opt_lookupcache_positive, "pos" },
235 { Opt_lookupcache_positive, "positive" },
236 { Opt_lookupcache_none, "none" },
237
238 { Opt_lookupcache_err, NULL }
239 };
240
241 enum {
242 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
243 Opt_local_lock_none,
244
245 Opt_local_lock_err
246 };
247
248 static match_table_t nfs_local_lock_tokens = {
249 { Opt_local_lock_all, "all" },
250 { Opt_local_lock_flock, "flock" },
251 { Opt_local_lock_posix, "posix" },
252 { Opt_local_lock_none, "none" },
253
254 { Opt_local_lock_err, NULL }
255 };
256
257
258 static void nfs_umount_begin(struct super_block *);
259 static int nfs_statfs(struct dentry *, struct kstatfs *);
260 static int nfs_show_options(struct seq_file *, struct vfsmount *);
261 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
262 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
263 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
264 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
265 static void nfs_put_super(struct super_block *);
266 static void nfs_kill_super(struct super_block *);
267 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
268
269 static struct file_system_type nfs_fs_type = {
270 .owner = THIS_MODULE,
271 .name = "nfs",
272 .get_sb = nfs_get_sb,
273 .kill_sb = nfs_kill_super,
274 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
275 };
276
277 struct file_system_type nfs_xdev_fs_type = {
278 .owner = THIS_MODULE,
279 .name = "nfs",
280 .get_sb = nfs_xdev_get_sb,
281 .kill_sb = nfs_kill_super,
282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
283 };
284
285 static const struct super_operations nfs_sops = {
286 .alloc_inode = nfs_alloc_inode,
287 .destroy_inode = nfs_destroy_inode,
288 .write_inode = nfs_write_inode,
289 .put_super = nfs_put_super,
290 .statfs = nfs_statfs,
291 .evict_inode = nfs_evict_inode,
292 .umount_begin = nfs_umount_begin,
293 .show_options = nfs_show_options,
294 .show_stats = nfs_show_stats,
295 .remount_fs = nfs_remount,
296 };
297
298 #ifdef CONFIG_NFS_V4
299 static int nfs4_validate_text_mount_data(void *options,
300 struct nfs_parsed_mount_data *args, const char *dev_name);
301 static int nfs4_try_mount(int flags, const char *dev_name,
302 struct nfs_parsed_mount_data *data, struct vfsmount *mnt);
303 static int nfs4_get_sb(struct file_system_type *fs_type,
304 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
305 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
306 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
307 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
308 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
309 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
310 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
311 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
312 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
313 static void nfs4_kill_super(struct super_block *sb);
314
315 static struct file_system_type nfs4_fs_type = {
316 .owner = THIS_MODULE,
317 .name = "nfs4",
318 .get_sb = nfs4_get_sb,
319 .kill_sb = nfs4_kill_super,
320 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
321 };
322
323 static struct file_system_type nfs4_remote_fs_type = {
324 .owner = THIS_MODULE,
325 .name = "nfs4",
326 .get_sb = nfs4_remote_get_sb,
327 .kill_sb = nfs4_kill_super,
328 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
329 };
330
331 struct file_system_type nfs4_xdev_fs_type = {
332 .owner = THIS_MODULE,
333 .name = "nfs4",
334 .get_sb = nfs4_xdev_get_sb,
335 .kill_sb = nfs4_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
337 };
338
339 static struct file_system_type nfs4_remote_referral_fs_type = {
340 .owner = THIS_MODULE,
341 .name = "nfs4",
342 .get_sb = nfs4_remote_referral_get_sb,
343 .kill_sb = nfs4_kill_super,
344 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
345 };
346
347 struct file_system_type nfs4_referral_fs_type = {
348 .owner = THIS_MODULE,
349 .name = "nfs4",
350 .get_sb = nfs4_referral_get_sb,
351 .kill_sb = nfs4_kill_super,
352 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
353 };
354
355 static const struct super_operations nfs4_sops = {
356 .alloc_inode = nfs_alloc_inode,
357 .destroy_inode = nfs_destroy_inode,
358 .write_inode = nfs_write_inode,
359 .put_super = nfs_put_super,
360 .statfs = nfs_statfs,
361 .evict_inode = nfs4_evict_inode,
362 .umount_begin = nfs_umount_begin,
363 .show_options = nfs_show_options,
364 .show_stats = nfs_show_stats,
365 .remount_fs = nfs_remount,
366 };
367 #endif
368
369 static struct shrinker acl_shrinker = {
370 .shrink = nfs_access_cache_shrinker,
371 .seeks = DEFAULT_SEEKS,
372 };
373
374 /*
375 * Register the NFS filesystems
376 */
377 int __init register_nfs_fs(void)
378 {
379 int ret;
380
381 ret = register_filesystem(&nfs_fs_type);
382 if (ret < 0)
383 goto error_0;
384
385 ret = nfs_register_sysctl();
386 if (ret < 0)
387 goto error_1;
388 #ifdef CONFIG_NFS_V4
389 ret = register_filesystem(&nfs4_fs_type);
390 if (ret < 0)
391 goto error_2;
392 #endif
393 register_shrinker(&acl_shrinker);
394 return 0;
395
396 #ifdef CONFIG_NFS_V4
397 error_2:
398 nfs_unregister_sysctl();
399 #endif
400 error_1:
401 unregister_filesystem(&nfs_fs_type);
402 error_0:
403 return ret;
404 }
405
406 /*
407 * Unregister the NFS filesystems
408 */
409 void __exit unregister_nfs_fs(void)
410 {
411 unregister_shrinker(&acl_shrinker);
412 #ifdef CONFIG_NFS_V4
413 unregister_filesystem(&nfs4_fs_type);
414 #endif
415 nfs_unregister_sysctl();
416 unregister_filesystem(&nfs_fs_type);
417 }
418
419 void nfs_sb_active(struct super_block *sb)
420 {
421 struct nfs_server *server = NFS_SB(sb);
422
423 if (atomic_inc_return(&server->active) == 1)
424 atomic_inc(&sb->s_active);
425 }
426
427 void nfs_sb_deactive(struct super_block *sb)
428 {
429 struct nfs_server *server = NFS_SB(sb);
430
431 if (atomic_dec_and_test(&server->active))
432 deactivate_super(sb);
433 }
434
435 /*
436 * Deliver file system statistics to userspace
437 */
438 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
439 {
440 struct nfs_server *server = NFS_SB(dentry->d_sb);
441 unsigned char blockbits;
442 unsigned long blockres;
443 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
444 struct nfs_fsstat res;
445 int error = -ENOMEM;
446
447 res.fattr = nfs_alloc_fattr();
448 if (res.fattr == NULL)
449 goto out_err;
450
451 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
452 if (unlikely(error == -ESTALE)) {
453 struct dentry *pd_dentry;
454
455 pd_dentry = dget_parent(dentry);
456 if (pd_dentry != NULL) {
457 nfs_zap_caches(pd_dentry->d_inode);
458 dput(pd_dentry);
459 }
460 }
461 nfs_free_fattr(res.fattr);
462 if (error < 0)
463 goto out_err;
464
465 buf->f_type = NFS_SUPER_MAGIC;
466
467 /*
468 * Current versions of glibc do not correctly handle the
469 * case where f_frsize != f_bsize. Eventually we want to
470 * report the value of wtmult in this field.
471 */
472 buf->f_frsize = dentry->d_sb->s_blocksize;
473
474 /*
475 * On most *nix systems, f_blocks, f_bfree, and f_bavail
476 * are reported in units of f_frsize. Linux hasn't had
477 * an f_frsize field in its statfs struct until recently,
478 * thus historically Linux's sys_statfs reports these
479 * fields in units of f_bsize.
480 */
481 buf->f_bsize = dentry->d_sb->s_blocksize;
482 blockbits = dentry->d_sb->s_blocksize_bits;
483 blockres = (1 << blockbits) - 1;
484 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
485 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
486 buf->f_bavail = (res.abytes + blockres) >> blockbits;
487
488 buf->f_files = res.tfiles;
489 buf->f_ffree = res.afiles;
490
491 buf->f_namelen = server->namelen;
492
493 return 0;
494
495 out_err:
496 dprintk("%s: statfs error = %d\n", __func__, -error);
497 return error;
498 }
499
500 /*
501 * Map the security flavour number to a name
502 */
503 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
504 {
505 static const struct {
506 rpc_authflavor_t flavour;
507 const char *str;
508 } sec_flavours[] = {
509 { RPC_AUTH_NULL, "null" },
510 { RPC_AUTH_UNIX, "sys" },
511 { RPC_AUTH_GSS_KRB5, "krb5" },
512 { RPC_AUTH_GSS_KRB5I, "krb5i" },
513 { RPC_AUTH_GSS_KRB5P, "krb5p" },
514 { RPC_AUTH_GSS_LKEY, "lkey" },
515 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
516 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
517 { RPC_AUTH_GSS_SPKM, "spkm" },
518 { RPC_AUTH_GSS_SPKMI, "spkmi" },
519 { RPC_AUTH_GSS_SPKMP, "spkmp" },
520 { UINT_MAX, "unknown" }
521 };
522 int i;
523
524 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
525 if (sec_flavours[i].flavour == flavour)
526 break;
527 }
528 return sec_flavours[i].str;
529 }
530
531 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
532 int showdefaults)
533 {
534 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
535
536 seq_printf(m, ",mountproto=");
537 switch (sap->sa_family) {
538 case AF_INET:
539 switch (nfss->mountd_protocol) {
540 case IPPROTO_UDP:
541 seq_printf(m, RPCBIND_NETID_UDP);
542 break;
543 case IPPROTO_TCP:
544 seq_printf(m, RPCBIND_NETID_TCP);
545 break;
546 default:
547 if (showdefaults)
548 seq_printf(m, "auto");
549 }
550 break;
551 case AF_INET6:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP6);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP6);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 default:
565 if (showdefaults)
566 seq_printf(m, "auto");
567 }
568 }
569
570 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572 {
573 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
574
575 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
576 return;
577
578 switch (sap->sa_family) {
579 case AF_INET: {
580 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
581 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
582 break;
583 }
584 case AF_INET6: {
585 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
586 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
587 break;
588 }
589 default:
590 if (showdefaults)
591 seq_printf(m, ",mountaddr=unspecified");
592 }
593
594 if (nfss->mountd_version || showdefaults)
595 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
596 if (nfss->mountd_port || showdefaults)
597 seq_printf(m, ",mountport=%u", nfss->mountd_port);
598
599 nfs_show_mountd_netid(m, nfss, showdefaults);
600 }
601
602 #ifdef CONFIG_NFS_V4
603 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
604 int showdefaults)
605 {
606 struct nfs_client *clp = nfss->nfs_client;
607
608 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
609 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
610 }
611 #else
612 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
613 int showdefaults)
614 {
615 }
616 #endif
617
618 /*
619 * Describe the mount options in force on this server representation
620 */
621 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
622 int showdefaults)
623 {
624 static const struct proc_nfs_info {
625 int flag;
626 const char *str;
627 const char *nostr;
628 } nfs_info[] = {
629 { NFS_MOUNT_SOFT, ",soft", ",hard" },
630 { NFS_MOUNT_POSIX, ",posix", "" },
631 { NFS_MOUNT_NOCTO, ",nocto", "" },
632 { NFS_MOUNT_NOAC, ",noac", "" },
633 { NFS_MOUNT_NONLM, ",nolock", "" },
634 { NFS_MOUNT_NOACL, ",noacl", "" },
635 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
636 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
637 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
638 { 0, NULL, NULL }
639 };
640 const struct proc_nfs_info *nfs_infop;
641 struct nfs_client *clp = nfss->nfs_client;
642 u32 version = clp->rpc_ops->version;
643 int local_flock, local_fcntl;
644
645 seq_printf(m, ",vers=%u", version);
646 seq_printf(m, ",rsize=%u", nfss->rsize);
647 seq_printf(m, ",wsize=%u", nfss->wsize);
648 if (nfss->bsize != 0)
649 seq_printf(m, ",bsize=%u", nfss->bsize);
650 seq_printf(m, ",namlen=%u", nfss->namelen);
651 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
652 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
653 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
654 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
655 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
656 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
657 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
658 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
659 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
660 if (nfss->flags & nfs_infop->flag)
661 seq_puts(m, nfs_infop->str);
662 else
663 seq_puts(m, nfs_infop->nostr);
664 }
665 seq_printf(m, ",proto=%s",
666 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
667 if (version == 4) {
668 if (nfss->port != NFS_PORT)
669 seq_printf(m, ",port=%u", nfss->port);
670 } else
671 if (nfss->port)
672 seq_printf(m, ",port=%u", nfss->port);
673
674 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
675 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
676 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
677
678 if (version != 4)
679 nfs_show_mountd_options(m, nfss, showdefaults);
680 else
681 nfs_show_nfsv4_options(m, nfss, showdefaults);
682
683 if (nfss->options & NFS_OPTION_FSCACHE)
684 seq_printf(m, ",fsc");
685
686 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
687 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
688 seq_printf(m, ",lookupcache=none");
689 else
690 seq_printf(m, ",lookupcache=pos");
691 }
692
693 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
694 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
695
696 if (!local_flock && !local_fcntl)
697 seq_printf(m, ",local_lock=none");
698 else if (local_flock && local_fcntl)
699 seq_printf(m, ",local_lock=all");
700 else if (local_flock)
701 seq_printf(m, ",local_lock=flock");
702 else
703 seq_printf(m, ",local_lock=posix");
704 }
705
706 /*
707 * Describe the mount options on this VFS mountpoint
708 */
709 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
710 {
711 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
712
713 nfs_show_mount_options(m, nfss, 0);
714
715 seq_printf(m, ",addr=%s",
716 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
717 RPC_DISPLAY_ADDR));
718
719 return 0;
720 }
721
722 /*
723 * Present statistical information for this VFS mountpoint
724 */
725 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
726 {
727 int i, cpu;
728 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
729 struct rpc_auth *auth = nfss->client->cl_auth;
730 struct nfs_iostats totals = { };
731
732 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
733
734 /*
735 * Display all mount option settings
736 */
737 seq_printf(m, "\n\topts:\t");
738 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
739 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
740 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
741 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
742 nfs_show_mount_options(m, nfss, 1);
743
744 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
745
746 seq_printf(m, "\n\tcaps:\t");
747 seq_printf(m, "caps=0x%x", nfss->caps);
748 seq_printf(m, ",wtmult=%u", nfss->wtmult);
749 seq_printf(m, ",dtsize=%u", nfss->dtsize);
750 seq_printf(m, ",bsize=%u", nfss->bsize);
751 seq_printf(m, ",namlen=%u", nfss->namelen);
752
753 #ifdef CONFIG_NFS_V4
754 if (nfss->nfs_client->rpc_ops->version == 4) {
755 seq_printf(m, "\n\tnfsv4:\t");
756 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
757 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
758 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
759 }
760 #endif
761
762 /*
763 * Display security flavor in effect for this mount
764 */
765 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
766 if (auth->au_flavor)
767 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
768
769 /*
770 * Display superblock I/O counters
771 */
772 for_each_possible_cpu(cpu) {
773 struct nfs_iostats *stats;
774
775 preempt_disable();
776 stats = per_cpu_ptr(nfss->io_stats, cpu);
777
778 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
779 totals.events[i] += stats->events[i];
780 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
781 totals.bytes[i] += stats->bytes[i];
782 #ifdef CONFIG_NFS_FSCACHE
783 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
784 totals.fscache[i] += stats->fscache[i];
785 #endif
786
787 preempt_enable();
788 }
789
790 seq_printf(m, "\n\tevents:\t");
791 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
792 seq_printf(m, "%lu ", totals.events[i]);
793 seq_printf(m, "\n\tbytes:\t");
794 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
795 seq_printf(m, "%Lu ", totals.bytes[i]);
796 #ifdef CONFIG_NFS_FSCACHE
797 if (nfss->options & NFS_OPTION_FSCACHE) {
798 seq_printf(m, "\n\tfsc:\t");
799 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
800 seq_printf(m, "%Lu ", totals.bytes[i]);
801 }
802 #endif
803 seq_printf(m, "\n");
804
805 rpc_print_iostats(m, nfss->client);
806
807 return 0;
808 }
809
810 /*
811 * Begin unmount by attempting to remove all automounted mountpoints we added
812 * in response to xdev traversals and referrals
813 */
814 static void nfs_umount_begin(struct super_block *sb)
815 {
816 struct nfs_server *server;
817 struct rpc_clnt *rpc;
818
819 server = NFS_SB(sb);
820 /* -EIO all pending I/O */
821 rpc = server->client_acl;
822 if (!IS_ERR(rpc))
823 rpc_killall_tasks(rpc);
824 rpc = server->client;
825 if (!IS_ERR(rpc))
826 rpc_killall_tasks(rpc);
827 }
828
829 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
830 {
831 struct nfs_parsed_mount_data *data;
832
833 data = kzalloc(sizeof(*data), GFP_KERNEL);
834 if (data) {
835 data->acregmin = NFS_DEF_ACREGMIN;
836 data->acregmax = NFS_DEF_ACREGMAX;
837 data->acdirmin = NFS_DEF_ACDIRMIN;
838 data->acdirmax = NFS_DEF_ACDIRMAX;
839 data->mount_server.port = NFS_UNSPEC_PORT;
840 data->nfs_server.port = NFS_UNSPEC_PORT;
841 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
842 data->auth_flavors[0] = RPC_AUTH_UNIX;
843 data->auth_flavor_len = 1;
844 data->version = version;
845 data->minorversion = 0;
846 }
847 return data;
848 }
849
850 /*
851 * Sanity-check a server address provided by the mount command.
852 *
853 * Address family must be initialized, and address must not be
854 * the ANY address for that family.
855 */
856 static int nfs_verify_server_address(struct sockaddr *addr)
857 {
858 switch (addr->sa_family) {
859 case AF_INET: {
860 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
861 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
862 }
863 case AF_INET6: {
864 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
865 return !ipv6_addr_any(sa);
866 }
867 }
868
869 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
870 return 0;
871 }
872
873 /*
874 * Select between a default port value and a user-specified port value.
875 * If a zero value is set, then autobind will be used.
876 */
877 static void nfs_set_port(struct sockaddr *sap, int *port,
878 const unsigned short default_port)
879 {
880 if (*port == NFS_UNSPEC_PORT)
881 *port = default_port;
882
883 rpc_set_port(sap, *port);
884 }
885
886 /*
887 * Sanity check the NFS transport protocol.
888 *
889 */
890 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
891 {
892 switch (mnt->nfs_server.protocol) {
893 case XPRT_TRANSPORT_UDP:
894 case XPRT_TRANSPORT_TCP:
895 case XPRT_TRANSPORT_RDMA:
896 break;
897 default:
898 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
899 }
900 }
901
902 /*
903 * For text based NFSv2/v3 mounts, the mount protocol transport default
904 * settings should depend upon the specified NFS transport.
905 */
906 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
907 {
908 nfs_validate_transport_protocol(mnt);
909
910 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
911 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
912 return;
913 switch (mnt->nfs_server.protocol) {
914 case XPRT_TRANSPORT_UDP:
915 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
916 break;
917 case XPRT_TRANSPORT_TCP:
918 case XPRT_TRANSPORT_RDMA:
919 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
920 }
921 }
922
923 /*
924 * Parse the value of the 'sec=' option.
925 */
926 static int nfs_parse_security_flavors(char *value,
927 struct nfs_parsed_mount_data *mnt)
928 {
929 substring_t args[MAX_OPT_ARGS];
930
931 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
932
933 switch (match_token(value, nfs_secflavor_tokens, args)) {
934 case Opt_sec_none:
935 mnt->auth_flavors[0] = RPC_AUTH_NULL;
936 break;
937 case Opt_sec_sys:
938 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
939 break;
940 case Opt_sec_krb5:
941 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
942 break;
943 case Opt_sec_krb5i:
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
945 break;
946 case Opt_sec_krb5p:
947 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
948 break;
949 case Opt_sec_lkey:
950 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
951 break;
952 case Opt_sec_lkeyi:
953 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
954 break;
955 case Opt_sec_lkeyp:
956 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
957 break;
958 case Opt_sec_spkm:
959 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
960 break;
961 case Opt_sec_spkmi:
962 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
963 break;
964 case Opt_sec_spkmp:
965 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
966 break;
967 default:
968 return 0;
969 }
970
971 mnt->auth_flavor_len = 1;
972 return 1;
973 }
974
975 /*
976 * Error-check and convert a string of mount options from user space into
977 * a data structure. The whole mount string is processed; bad options are
978 * skipped as they are encountered. If there were no errors, return 1;
979 * otherwise return 0 (zero).
980 */
981 static int nfs_parse_mount_options(char *raw,
982 struct nfs_parsed_mount_data *mnt)
983 {
984 char *p, *string, *secdata;
985 int rc, sloppy = 0, invalid_option = 0;
986 unsigned short protofamily = AF_UNSPEC;
987 unsigned short mountfamily = AF_UNSPEC;
988
989 if (!raw) {
990 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
991 return 1;
992 }
993 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
994
995 secdata = alloc_secdata();
996 if (!secdata)
997 goto out_nomem;
998
999 rc = security_sb_copy_data(raw, secdata);
1000 if (rc)
1001 goto out_security_failure;
1002
1003 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1004 if (rc)
1005 goto out_security_failure;
1006
1007 free_secdata(secdata);
1008
1009 while ((p = strsep(&raw, ",")) != NULL) {
1010 substring_t args[MAX_OPT_ARGS];
1011 unsigned long option;
1012 int token;
1013
1014 if (!*p)
1015 continue;
1016
1017 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1018
1019 token = match_token(p, nfs_mount_option_tokens, args);
1020 switch (token) {
1021
1022 /*
1023 * boolean options: foo/nofoo
1024 */
1025 case Opt_soft:
1026 mnt->flags |= NFS_MOUNT_SOFT;
1027 break;
1028 case Opt_hard:
1029 mnt->flags &= ~NFS_MOUNT_SOFT;
1030 break;
1031 case Opt_posix:
1032 mnt->flags |= NFS_MOUNT_POSIX;
1033 break;
1034 case Opt_noposix:
1035 mnt->flags &= ~NFS_MOUNT_POSIX;
1036 break;
1037 case Opt_cto:
1038 mnt->flags &= ~NFS_MOUNT_NOCTO;
1039 break;
1040 case Opt_nocto:
1041 mnt->flags |= NFS_MOUNT_NOCTO;
1042 break;
1043 case Opt_ac:
1044 mnt->flags &= ~NFS_MOUNT_NOAC;
1045 break;
1046 case Opt_noac:
1047 mnt->flags |= NFS_MOUNT_NOAC;
1048 break;
1049 case Opt_lock:
1050 mnt->flags &= ~NFS_MOUNT_NONLM;
1051 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1052 NFS_MOUNT_LOCAL_FCNTL);
1053 break;
1054 case Opt_nolock:
1055 mnt->flags |= NFS_MOUNT_NONLM;
1056 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1057 NFS_MOUNT_LOCAL_FCNTL);
1058 break;
1059 case Opt_v2:
1060 mnt->flags &= ~NFS_MOUNT_VER3;
1061 mnt->version = 2;
1062 break;
1063 case Opt_v3:
1064 mnt->flags |= NFS_MOUNT_VER3;
1065 mnt->version = 3;
1066 break;
1067 #ifdef CONFIG_NFS_V4
1068 case Opt_v4:
1069 mnt->flags &= ~NFS_MOUNT_VER3;
1070 mnt->version = 4;
1071 break;
1072 #endif
1073 case Opt_udp:
1074 mnt->flags &= ~NFS_MOUNT_TCP;
1075 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1076 break;
1077 case Opt_tcp:
1078 mnt->flags |= NFS_MOUNT_TCP;
1079 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1080 break;
1081 case Opt_rdma:
1082 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1083 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1084 xprt_load_transport(p);
1085 break;
1086 case Opt_acl:
1087 mnt->flags &= ~NFS_MOUNT_NOACL;
1088 break;
1089 case Opt_noacl:
1090 mnt->flags |= NFS_MOUNT_NOACL;
1091 break;
1092 case Opt_rdirplus:
1093 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1094 break;
1095 case Opt_nordirplus:
1096 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1097 break;
1098 case Opt_sharecache:
1099 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1100 break;
1101 case Opt_nosharecache:
1102 mnt->flags |= NFS_MOUNT_UNSHARED;
1103 break;
1104 case Opt_resvport:
1105 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1106 break;
1107 case Opt_noresvport:
1108 mnt->flags |= NFS_MOUNT_NORESVPORT;
1109 break;
1110 case Opt_fscache:
1111 mnt->options |= NFS_OPTION_FSCACHE;
1112 kfree(mnt->fscache_uniq);
1113 mnt->fscache_uniq = NULL;
1114 break;
1115 case Opt_nofscache:
1116 mnt->options &= ~NFS_OPTION_FSCACHE;
1117 kfree(mnt->fscache_uniq);
1118 mnt->fscache_uniq = NULL;
1119 break;
1120
1121 /*
1122 * options that take numeric values
1123 */
1124 case Opt_port:
1125 string = match_strdup(args);
1126 if (string == NULL)
1127 goto out_nomem;
1128 rc = strict_strtoul(string, 10, &option);
1129 kfree(string);
1130 if (rc != 0 || option > USHRT_MAX)
1131 goto out_invalid_value;
1132 mnt->nfs_server.port = option;
1133 break;
1134 case Opt_rsize:
1135 string = match_strdup(args);
1136 if (string == NULL)
1137 goto out_nomem;
1138 rc = strict_strtoul(string, 10, &option);
1139 kfree(string);
1140 if (rc != 0)
1141 goto out_invalid_value;
1142 mnt->rsize = option;
1143 break;
1144 case Opt_wsize:
1145 string = match_strdup(args);
1146 if (string == NULL)
1147 goto out_nomem;
1148 rc = strict_strtoul(string, 10, &option);
1149 kfree(string);
1150 if (rc != 0)
1151 goto out_invalid_value;
1152 mnt->wsize = option;
1153 break;
1154 case Opt_bsize:
1155 string = match_strdup(args);
1156 if (string == NULL)
1157 goto out_nomem;
1158 rc = strict_strtoul(string, 10, &option);
1159 kfree(string);
1160 if (rc != 0)
1161 goto out_invalid_value;
1162 mnt->bsize = option;
1163 break;
1164 case Opt_timeo:
1165 string = match_strdup(args);
1166 if (string == NULL)
1167 goto out_nomem;
1168 rc = strict_strtoul(string, 10, &option);
1169 kfree(string);
1170 if (rc != 0 || option == 0)
1171 goto out_invalid_value;
1172 mnt->timeo = option;
1173 break;
1174 case Opt_retrans:
1175 string = match_strdup(args);
1176 if (string == NULL)
1177 goto out_nomem;
1178 rc = strict_strtoul(string, 10, &option);
1179 kfree(string);
1180 if (rc != 0 || option == 0)
1181 goto out_invalid_value;
1182 mnt->retrans = option;
1183 break;
1184 case Opt_acregmin:
1185 string = match_strdup(args);
1186 if (string == NULL)
1187 goto out_nomem;
1188 rc = strict_strtoul(string, 10, &option);
1189 kfree(string);
1190 if (rc != 0)
1191 goto out_invalid_value;
1192 mnt->acregmin = option;
1193 break;
1194 case Opt_acregmax:
1195 string = match_strdup(args);
1196 if (string == NULL)
1197 goto out_nomem;
1198 rc = strict_strtoul(string, 10, &option);
1199 kfree(string);
1200 if (rc != 0)
1201 goto out_invalid_value;
1202 mnt->acregmax = option;
1203 break;
1204 case Opt_acdirmin:
1205 string = match_strdup(args);
1206 if (string == NULL)
1207 goto out_nomem;
1208 rc = strict_strtoul(string, 10, &option);
1209 kfree(string);
1210 if (rc != 0)
1211 goto out_invalid_value;
1212 mnt->acdirmin = option;
1213 break;
1214 case Opt_acdirmax:
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 mnt->acdirmax = option;
1223 break;
1224 case Opt_actimeo:
1225 string = match_strdup(args);
1226 if (string == NULL)
1227 goto out_nomem;
1228 rc = strict_strtoul(string, 10, &option);
1229 kfree(string);
1230 if (rc != 0)
1231 goto out_invalid_value;
1232 mnt->acregmin = mnt->acregmax =
1233 mnt->acdirmin = mnt->acdirmax = option;
1234 break;
1235 case Opt_namelen:
1236 string = match_strdup(args);
1237 if (string == NULL)
1238 goto out_nomem;
1239 rc = strict_strtoul(string, 10, &option);
1240 kfree(string);
1241 if (rc != 0)
1242 goto out_invalid_value;
1243 mnt->namlen = option;
1244 break;
1245 case Opt_mountport:
1246 string = match_strdup(args);
1247 if (string == NULL)
1248 goto out_nomem;
1249 rc = strict_strtoul(string, 10, &option);
1250 kfree(string);
1251 if (rc != 0 || option > USHRT_MAX)
1252 goto out_invalid_value;
1253 mnt->mount_server.port = option;
1254 break;
1255 case Opt_mountvers:
1256 string = match_strdup(args);
1257 if (string == NULL)
1258 goto out_nomem;
1259 rc = strict_strtoul(string, 10, &option);
1260 kfree(string);
1261 if (rc != 0 ||
1262 option < NFS_MNT_VERSION ||
1263 option > NFS_MNT3_VERSION)
1264 goto out_invalid_value;
1265 mnt->mount_server.version = option;
1266 break;
1267 case Opt_nfsvers:
1268 string = match_strdup(args);
1269 if (string == NULL)
1270 goto out_nomem;
1271 rc = strict_strtoul(string, 10, &option);
1272 kfree(string);
1273 if (rc != 0)
1274 goto out_invalid_value;
1275 switch (option) {
1276 case NFS2_VERSION:
1277 mnt->flags &= ~NFS_MOUNT_VER3;
1278 mnt->version = 2;
1279 break;
1280 case NFS3_VERSION:
1281 mnt->flags |= NFS_MOUNT_VER3;
1282 mnt->version = 3;
1283 break;
1284 #ifdef CONFIG_NFS_V4
1285 case NFS4_VERSION:
1286 mnt->flags &= ~NFS_MOUNT_VER3;
1287 mnt->version = 4;
1288 break;
1289 #endif
1290 default:
1291 goto out_invalid_value;
1292 }
1293 break;
1294 case Opt_minorversion:
1295 string = match_strdup(args);
1296 if (string == NULL)
1297 goto out_nomem;
1298 rc = strict_strtoul(string, 10, &option);
1299 kfree(string);
1300 if (rc != 0)
1301 goto out_invalid_value;
1302 if (option > NFS4_MAX_MINOR_VERSION)
1303 goto out_invalid_value;
1304 mnt->minorversion = option;
1305 break;
1306
1307 /*
1308 * options that take text values
1309 */
1310 case Opt_sec:
1311 string = match_strdup(args);
1312 if (string == NULL)
1313 goto out_nomem;
1314 rc = nfs_parse_security_flavors(string, mnt);
1315 kfree(string);
1316 if (!rc) {
1317 dfprintk(MOUNT, "NFS: unrecognized "
1318 "security flavor\n");
1319 return 0;
1320 }
1321 break;
1322 case Opt_proto:
1323 string = match_strdup(args);
1324 if (string == NULL)
1325 goto out_nomem;
1326 token = match_token(string,
1327 nfs_xprt_protocol_tokens, args);
1328
1329 protofamily = AF_INET;
1330 switch (token) {
1331 case Opt_xprt_udp6:
1332 protofamily = AF_INET6;
1333 case Opt_xprt_udp:
1334 mnt->flags &= ~NFS_MOUNT_TCP;
1335 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1336 kfree(string);
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 kfree(string);
1344 break;
1345 case Opt_xprt_rdma:
1346 /* vector side protocols to TCP */
1347 mnt->flags |= NFS_MOUNT_TCP;
1348 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1349 xprt_load_transport(string);
1350 kfree(string);
1351 break;
1352 default:
1353 dfprintk(MOUNT, "NFS: unrecognized "
1354 "transport protocol\n");
1355 kfree(string);
1356 return 0;
1357 }
1358 break;
1359 case Opt_mountproto:
1360 string = match_strdup(args);
1361 if (string == NULL)
1362 goto out_nomem;
1363 token = match_token(string,
1364 nfs_xprt_protocol_tokens, args);
1365 kfree(string);
1366
1367 mountfamily = AF_INET;
1368 switch (token) {
1369 case Opt_xprt_udp6:
1370 mountfamily = AF_INET6;
1371 case Opt_xprt_udp:
1372 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1373 break;
1374 case Opt_xprt_tcp6:
1375 mountfamily = AF_INET6;
1376 case Opt_xprt_tcp:
1377 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1378 break;
1379 case Opt_xprt_rdma: /* not used for side protocols */
1380 default:
1381 dfprintk(MOUNT, "NFS: unrecognized "
1382 "transport protocol\n");
1383 return 0;
1384 }
1385 break;
1386 case Opt_addr:
1387 string = match_strdup(args);
1388 if (string == NULL)
1389 goto out_nomem;
1390 mnt->nfs_server.addrlen =
1391 rpc_pton(string, strlen(string),
1392 (struct sockaddr *)
1393 &mnt->nfs_server.address,
1394 sizeof(mnt->nfs_server.address));
1395 kfree(string);
1396 if (mnt->nfs_server.addrlen == 0)
1397 goto out_invalid_address;
1398 break;
1399 case Opt_clientaddr:
1400 string = match_strdup(args);
1401 if (string == NULL)
1402 goto out_nomem;
1403 kfree(mnt->client_address);
1404 mnt->client_address = string;
1405 break;
1406 case Opt_mounthost:
1407 string = match_strdup(args);
1408 if (string == NULL)
1409 goto out_nomem;
1410 kfree(mnt->mount_server.hostname);
1411 mnt->mount_server.hostname = string;
1412 break;
1413 case Opt_mountaddr:
1414 string = match_strdup(args);
1415 if (string == NULL)
1416 goto out_nomem;
1417 mnt->mount_server.addrlen =
1418 rpc_pton(string, strlen(string),
1419 (struct sockaddr *)
1420 &mnt->mount_server.address,
1421 sizeof(mnt->mount_server.address));
1422 kfree(string);
1423 if (mnt->mount_server.addrlen == 0)
1424 goto out_invalid_address;
1425 break;
1426 case Opt_lookupcache:
1427 string = match_strdup(args);
1428 if (string == NULL)
1429 goto out_nomem;
1430 token = match_token(string,
1431 nfs_lookupcache_tokens, args);
1432 kfree(string);
1433 switch (token) {
1434 case Opt_lookupcache_all:
1435 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1436 break;
1437 case Opt_lookupcache_positive:
1438 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1439 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1440 break;
1441 case Opt_lookupcache_none:
1442 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1443 break;
1444 default:
1445 dfprintk(MOUNT, "NFS: invalid "
1446 "lookupcache argument\n");
1447 return 0;
1448 };
1449 break;
1450 case Opt_fscache_uniq:
1451 string = match_strdup(args);
1452 if (string == NULL)
1453 goto out_nomem;
1454 kfree(mnt->fscache_uniq);
1455 mnt->fscache_uniq = string;
1456 mnt->options |= NFS_OPTION_FSCACHE;
1457 break;
1458 case Opt_local_lock:
1459 string = match_strdup(args);
1460 if (string == NULL)
1461 goto out_nomem;
1462 token = match_token(string, nfs_local_lock_tokens,
1463 args);
1464 kfree(string);
1465 switch (token) {
1466 case Opt_local_lock_all:
1467 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1468 NFS_MOUNT_LOCAL_FCNTL);
1469 break;
1470 case Opt_local_lock_flock:
1471 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1472 break;
1473 case Opt_local_lock_posix:
1474 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1475 break;
1476 case Opt_local_lock_none:
1477 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1478 NFS_MOUNT_LOCAL_FCNTL);
1479 break;
1480 default:
1481 dfprintk(MOUNT, "NFS: invalid "
1482 "local_lock argument\n");
1483 return 0;
1484 };
1485 break;
1486
1487 /*
1488 * Special options
1489 */
1490 case Opt_sloppy:
1491 sloppy = 1;
1492 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1493 break;
1494 case Opt_userspace:
1495 case Opt_deprecated:
1496 dfprintk(MOUNT, "NFS: ignoring mount option "
1497 "'%s'\n", p);
1498 break;
1499
1500 default:
1501 invalid_option = 1;
1502 dfprintk(MOUNT, "NFS: unrecognized mount option "
1503 "'%s'\n", p);
1504 }
1505 }
1506
1507 if (!sloppy && invalid_option)
1508 return 0;
1509
1510 /*
1511 * verify that any proto=/mountproto= options match the address
1512 * familiies in the addr=/mountaddr= options.
1513 */
1514 if (protofamily != AF_UNSPEC &&
1515 protofamily != mnt->nfs_server.address.ss_family)
1516 goto out_proto_mismatch;
1517
1518 if (mountfamily != AF_UNSPEC) {
1519 if (mnt->mount_server.addrlen) {
1520 if (mountfamily != mnt->mount_server.address.ss_family)
1521 goto out_mountproto_mismatch;
1522 } else {
1523 if (mountfamily != mnt->nfs_server.address.ss_family)
1524 goto out_mountproto_mismatch;
1525 }
1526 }
1527
1528 return 1;
1529
1530 out_mountproto_mismatch:
1531 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1532 "option\n");
1533 return 0;
1534 out_proto_mismatch:
1535 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1536 return 0;
1537 out_invalid_address:
1538 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1539 return 0;
1540 out_invalid_value:
1541 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1542 return 0;
1543 out_nomem:
1544 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1545 return 0;
1546 out_security_failure:
1547 free_secdata(secdata);
1548 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1549 return 0;
1550 }
1551
1552 /*
1553 * Match the requested auth flavors with the list returned by
1554 * the server. Returns zero and sets the mount's authentication
1555 * flavor on success; returns -EACCES if server does not support
1556 * the requested flavor.
1557 */
1558 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1559 struct nfs_mount_request *request)
1560 {
1561 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1562
1563 /*
1564 * Certain releases of Linux's mountd return an empty
1565 * flavor list. To prevent behavioral regression with
1566 * these servers (ie. rejecting mounts that used to
1567 * succeed), revert to pre-2.6.32 behavior (no checking)
1568 * if the returned flavor list is empty.
1569 */
1570 if (server_authlist_len == 0)
1571 return 0;
1572
1573 /*
1574 * We avoid sophisticated negotiating here, as there are
1575 * plenty of cases where we can get it wrong, providing
1576 * either too little or too much security.
1577 *
1578 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1579 * flavor listed first. However, some servers list
1580 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1581 * preferred default, in args->auth_flavors[0] if user
1582 * didn't specify sec= mount option.
1583 */
1584 for (i = 0; i < args->auth_flavor_len; i++)
1585 for (j = 0; j < server_authlist_len; j++)
1586 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1587 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1588 request->auth_flavs[j]);
1589 args->auth_flavors[0] = request->auth_flavs[j];
1590 return 0;
1591 }
1592
1593 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1594 nfs_umount(request);
1595 return -EACCES;
1596 }
1597
1598 /*
1599 * Use the remote server's MOUNT service to request the NFS file handle
1600 * corresponding to the provided path.
1601 */
1602 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1603 struct nfs_fh *root_fh)
1604 {
1605 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1606 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1607 struct nfs_mount_request request = {
1608 .sap = (struct sockaddr *)
1609 &args->mount_server.address,
1610 .dirpath = args->nfs_server.export_path,
1611 .protocol = args->mount_server.protocol,
1612 .fh = root_fh,
1613 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1614 .auth_flav_len = &server_authlist_len,
1615 .auth_flavs = server_authlist,
1616 };
1617 int status;
1618
1619 if (args->mount_server.version == 0) {
1620 switch (args->version) {
1621 default:
1622 args->mount_server.version = NFS_MNT3_VERSION;
1623 break;
1624 case 2:
1625 args->mount_server.version = NFS_MNT_VERSION;
1626 }
1627 }
1628 request.version = args->mount_server.version;
1629
1630 if (args->mount_server.hostname)
1631 request.hostname = args->mount_server.hostname;
1632 else
1633 request.hostname = args->nfs_server.hostname;
1634
1635 /*
1636 * Construct the mount server's address.
1637 */
1638 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1639 memcpy(request.sap, &args->nfs_server.address,
1640 args->nfs_server.addrlen);
1641 args->mount_server.addrlen = args->nfs_server.addrlen;
1642 }
1643 request.salen = args->mount_server.addrlen;
1644 nfs_set_port(request.sap, &args->mount_server.port, 0);
1645
1646 /*
1647 * Now ask the mount server to map our export path
1648 * to a file handle.
1649 */
1650 status = nfs_mount(&request);
1651 if (status != 0) {
1652 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1653 request.hostname, status);
1654 return status;
1655 }
1656
1657 /*
1658 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1659 */
1660 if (args->mount_server.version != NFS_MNT3_VERSION)
1661 return 0;
1662 return nfs_walk_authlist(args, &request);
1663 }
1664
1665 static int nfs_parse_simple_hostname(const char *dev_name,
1666 char **hostname, size_t maxnamlen,
1667 char **export_path, size_t maxpathlen)
1668 {
1669 size_t len;
1670 char *colon, *comma;
1671
1672 colon = strchr(dev_name, ':');
1673 if (colon == NULL)
1674 goto out_bad_devname;
1675
1676 len = colon - dev_name;
1677 if (len > maxnamlen)
1678 goto out_hostname;
1679
1680 /* N.B. caller will free nfs_server.hostname in all cases */
1681 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1682 if (!*hostname)
1683 goto out_nomem;
1684
1685 /* kill possible hostname list: not supported */
1686 comma = strchr(*hostname, ',');
1687 if (comma != NULL) {
1688 if (comma == *hostname)
1689 goto out_bad_devname;
1690 *comma = '\0';
1691 }
1692
1693 colon++;
1694 len = strlen(colon);
1695 if (len > maxpathlen)
1696 goto out_path;
1697 *export_path = kstrndup(colon, len, GFP_KERNEL);
1698 if (!*export_path)
1699 goto out_nomem;
1700
1701 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1702 return 0;
1703
1704 out_bad_devname:
1705 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1706 return -EINVAL;
1707
1708 out_nomem:
1709 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1710 return -ENOMEM;
1711
1712 out_hostname:
1713 dfprintk(MOUNT, "NFS: server hostname too long\n");
1714 return -ENAMETOOLONG;
1715
1716 out_path:
1717 dfprintk(MOUNT, "NFS: export pathname too long\n");
1718 return -ENAMETOOLONG;
1719 }
1720
1721 /*
1722 * Hostname has square brackets around it because it contains one or
1723 * more colons. We look for the first closing square bracket, and a
1724 * colon must follow it.
1725 */
1726 static int nfs_parse_protected_hostname(const char *dev_name,
1727 char **hostname, size_t maxnamlen,
1728 char **export_path, size_t maxpathlen)
1729 {
1730 size_t len;
1731 char *start, *end;
1732
1733 start = (char *)(dev_name + 1);
1734
1735 end = strchr(start, ']');
1736 if (end == NULL)
1737 goto out_bad_devname;
1738 if (*(end + 1) != ':')
1739 goto out_bad_devname;
1740
1741 len = end - start;
1742 if (len > maxnamlen)
1743 goto out_hostname;
1744
1745 /* N.B. caller will free nfs_server.hostname in all cases */
1746 *hostname = kstrndup(start, len, GFP_KERNEL);
1747 if (*hostname == NULL)
1748 goto out_nomem;
1749
1750 end += 2;
1751 len = strlen(end);
1752 if (len > maxpathlen)
1753 goto out_path;
1754 *export_path = kstrndup(end, len, GFP_KERNEL);
1755 if (!*export_path)
1756 goto out_nomem;
1757
1758 return 0;
1759
1760 out_bad_devname:
1761 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1762 return -EINVAL;
1763
1764 out_nomem:
1765 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1766 return -ENOMEM;
1767
1768 out_hostname:
1769 dfprintk(MOUNT, "NFS: server hostname too long\n");
1770 return -ENAMETOOLONG;
1771
1772 out_path:
1773 dfprintk(MOUNT, "NFS: export pathname too long\n");
1774 return -ENAMETOOLONG;
1775 }
1776
1777 /*
1778 * Split "dev_name" into "hostname:export_path".
1779 *
1780 * The leftmost colon demarks the split between the server's hostname
1781 * and the export path. If the hostname starts with a left square
1782 * bracket, then it may contain colons.
1783 *
1784 * Note: caller frees hostname and export path, even on error.
1785 */
1786 static int nfs_parse_devname(const char *dev_name,
1787 char **hostname, size_t maxnamlen,
1788 char **export_path, size_t maxpathlen)
1789 {
1790 if (*dev_name == '[')
1791 return nfs_parse_protected_hostname(dev_name,
1792 hostname, maxnamlen,
1793 export_path, maxpathlen);
1794
1795 return nfs_parse_simple_hostname(dev_name,
1796 hostname, maxnamlen,
1797 export_path, maxpathlen);
1798 }
1799
1800 /*
1801 * Validate the NFS2/NFS3 mount data
1802 * - fills in the mount root filehandle
1803 *
1804 * For option strings, user space handles the following behaviors:
1805 *
1806 * + DNS: mapping server host name to IP address ("addr=" option)
1807 *
1808 * + failure mode: how to behave if a mount request can't be handled
1809 * immediately ("fg/bg" option)
1810 *
1811 * + retry: how often to retry a mount request ("retry=" option)
1812 *
1813 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1814 * mountproto=tcp after mountproto=udp, and so on
1815 */
1816 static int nfs_validate_mount_data(void *options,
1817 struct nfs_parsed_mount_data *args,
1818 struct nfs_fh *mntfh,
1819 const char *dev_name)
1820 {
1821 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1822 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1823
1824 if (data == NULL)
1825 goto out_no_data;
1826
1827 switch (data->version) {
1828 case 1:
1829 data->namlen = 0;
1830 case 2:
1831 data->bsize = 0;
1832 case 3:
1833 if (data->flags & NFS_MOUNT_VER3)
1834 goto out_no_v3;
1835 data->root.size = NFS2_FHSIZE;
1836 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1837 case 4:
1838 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1839 goto out_no_sec;
1840 case 5:
1841 memset(data->context, 0, sizeof(data->context));
1842 case 6:
1843 if (data->flags & NFS_MOUNT_VER3) {
1844 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1845 goto out_invalid_fh;
1846 mntfh->size = data->root.size;
1847 args->version = 3;
1848 } else {
1849 mntfh->size = NFS2_FHSIZE;
1850 args->version = 2;
1851 }
1852
1853
1854 memcpy(mntfh->data, data->root.data, mntfh->size);
1855 if (mntfh->size < sizeof(mntfh->data))
1856 memset(mntfh->data + mntfh->size, 0,
1857 sizeof(mntfh->data) - mntfh->size);
1858
1859 /*
1860 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1861 * can deal with.
1862 */
1863 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1864 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1865 args->rsize = data->rsize;
1866 args->wsize = data->wsize;
1867 args->timeo = data->timeo;
1868 args->retrans = data->retrans;
1869 args->acregmin = data->acregmin;
1870 args->acregmax = data->acregmax;
1871 args->acdirmin = data->acdirmin;
1872 args->acdirmax = data->acdirmax;
1873
1874 memcpy(sap, &data->addr, sizeof(data->addr));
1875 args->nfs_server.addrlen = sizeof(data->addr);
1876 if (!nfs_verify_server_address(sap))
1877 goto out_no_address;
1878
1879 if (!(data->flags & NFS_MOUNT_TCP))
1880 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1881 /* N.B. caller will free nfs_server.hostname in all cases */
1882 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1883 args->namlen = data->namlen;
1884 args->bsize = data->bsize;
1885
1886 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1887 args->auth_flavors[0] = data->pseudoflavor;
1888 if (!args->nfs_server.hostname)
1889 goto out_nomem;
1890
1891 if (!(data->flags & NFS_MOUNT_NONLM))
1892 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1893 NFS_MOUNT_LOCAL_FCNTL);
1894 else
1895 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1896 NFS_MOUNT_LOCAL_FCNTL);
1897 /*
1898 * The legacy version 6 binary mount data from userspace has a
1899 * field used only to transport selinux information into the
1900 * the kernel. To continue to support that functionality we
1901 * have a touch of selinux knowledge here in the NFS code. The
1902 * userspace code converted context=blah to just blah so we are
1903 * converting back to the full string selinux understands.
1904 */
1905 if (data->context[0]){
1906 #ifdef CONFIG_SECURITY_SELINUX
1907 int rc;
1908 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1909 if (!opts_str)
1910 return -ENOMEM;
1911 strcpy(opts_str, "context=");
1912 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1913 strcat(opts_str, &data->context[0]);
1914 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1915 kfree(opts_str);
1916 if (rc)
1917 return rc;
1918 #else
1919 return -EINVAL;
1920 #endif
1921 }
1922
1923 break;
1924 default: {
1925 int status;
1926
1927 if (nfs_parse_mount_options((char *)options, args) == 0)
1928 return -EINVAL;
1929
1930 if (!nfs_verify_server_address(sap))
1931 goto out_no_address;
1932
1933 if (args->version == 4)
1934 #ifdef CONFIG_NFS_V4
1935 return nfs4_validate_text_mount_data(options,
1936 args, dev_name);
1937 #else
1938 goto out_v4_not_compiled;
1939 #endif
1940
1941 nfs_set_port(sap, &args->nfs_server.port, 0);
1942
1943 nfs_set_mount_transport_protocol(args);
1944
1945 status = nfs_parse_devname(dev_name,
1946 &args->nfs_server.hostname,
1947 PAGE_SIZE,
1948 &args->nfs_server.export_path,
1949 NFS_MAXPATHLEN);
1950 if (!status)
1951 status = nfs_try_mount(args, mntfh);
1952
1953 kfree(args->nfs_server.export_path);
1954 args->nfs_server.export_path = NULL;
1955
1956 if (status)
1957 return status;
1958
1959 break;
1960 }
1961 }
1962
1963 #ifndef CONFIG_NFS_V3
1964 if (args->version == 3)
1965 goto out_v3_not_compiled;
1966 #endif /* !CONFIG_NFS_V3 */
1967
1968 return 0;
1969
1970 out_no_data:
1971 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1972 return -EINVAL;
1973
1974 out_no_v3:
1975 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1976 data->version);
1977 return -EINVAL;
1978
1979 out_no_sec:
1980 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1981 return -EINVAL;
1982
1983 #ifndef CONFIG_NFS_V3
1984 out_v3_not_compiled:
1985 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1986 return -EPROTONOSUPPORT;
1987 #endif /* !CONFIG_NFS_V3 */
1988
1989 #ifndef CONFIG_NFS_V4
1990 out_v4_not_compiled:
1991 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1992 return -EPROTONOSUPPORT;
1993 #endif /* !CONFIG_NFS_V4 */
1994
1995 out_nomem:
1996 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1997 return -ENOMEM;
1998
1999 out_no_address:
2000 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2001 return -EINVAL;
2002
2003 out_invalid_fh:
2004 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2005 return -EINVAL;
2006 }
2007
2008 static int
2009 nfs_compare_remount_data(struct nfs_server *nfss,
2010 struct nfs_parsed_mount_data *data)
2011 {
2012 if (data->flags != nfss->flags ||
2013 data->rsize != nfss->rsize ||
2014 data->wsize != nfss->wsize ||
2015 data->retrans != nfss->client->cl_timeout->to_retries ||
2016 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2017 data->acregmin != nfss->acregmin / HZ ||
2018 data->acregmax != nfss->acregmax / HZ ||
2019 data->acdirmin != nfss->acdirmin / HZ ||
2020 data->acdirmax != nfss->acdirmax / HZ ||
2021 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2022 data->nfs_server.port != nfss->port ||
2023 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2024 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2025 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2026 return -EINVAL;
2027
2028 return 0;
2029 }
2030
2031 static int
2032 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2033 {
2034 int error;
2035 struct nfs_server *nfss = sb->s_fs_info;
2036 struct nfs_parsed_mount_data *data;
2037 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2038 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2039 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2040
2041 /*
2042 * Userspace mount programs that send binary options generally send
2043 * them populated with default values. We have no way to know which
2044 * ones were explicitly specified. Fall back to legacy behavior and
2045 * just return success.
2046 */
2047 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2048 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2049 options->version <= 6))))
2050 return 0;
2051
2052 data = kzalloc(sizeof(*data), GFP_KERNEL);
2053 if (data == NULL)
2054 return -ENOMEM;
2055
2056 /* fill out struct with values from existing mount */
2057 data->flags = nfss->flags;
2058 data->rsize = nfss->rsize;
2059 data->wsize = nfss->wsize;
2060 data->retrans = nfss->client->cl_timeout->to_retries;
2061 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2062 data->acregmin = nfss->acregmin / HZ;
2063 data->acregmax = nfss->acregmax / HZ;
2064 data->acdirmin = nfss->acdirmin / HZ;
2065 data->acdirmax = nfss->acdirmax / HZ;
2066 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2067 data->nfs_server.port = nfss->port;
2068 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2069 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2070 data->nfs_server.addrlen);
2071
2072 /* overwrite those values with any that were specified */
2073 error = nfs_parse_mount_options((char *)options, data);
2074 if (error < 0)
2075 goto out;
2076
2077 /* compare new mount options with old ones */
2078 error = nfs_compare_remount_data(nfss, data);
2079 out:
2080 kfree(data);
2081 return error;
2082 }
2083
2084 /*
2085 * Initialise the common bits of the superblock
2086 */
2087 static inline void nfs_initialise_sb(struct super_block *sb)
2088 {
2089 struct nfs_server *server = NFS_SB(sb);
2090
2091 sb->s_magic = NFS_SUPER_MAGIC;
2092
2093 /* We probably want something more informative here */
2094 snprintf(sb->s_id, sizeof(sb->s_id),
2095 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2096
2097 if (sb->s_blocksize == 0)
2098 sb->s_blocksize = nfs_block_bits(server->wsize,
2099 &sb->s_blocksize_bits);
2100
2101 if (server->flags & NFS_MOUNT_NOAC)
2102 sb->s_flags |= MS_SYNCHRONOUS;
2103
2104 sb->s_bdi = &server->backing_dev_info;
2105
2106 nfs_super_set_maxbytes(sb, server->maxfilesize);
2107 }
2108
2109 /*
2110 * Finish setting up an NFS2/3 superblock
2111 */
2112 static void nfs_fill_super(struct super_block *sb,
2113 struct nfs_parsed_mount_data *data)
2114 {
2115 struct nfs_server *server = NFS_SB(sb);
2116
2117 sb->s_blocksize_bits = 0;
2118 sb->s_blocksize = 0;
2119 if (data->bsize)
2120 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2121
2122 if (server->nfs_client->rpc_ops->version == 3) {
2123 /* The VFS shouldn't apply the umask to mode bits. We will do
2124 * so ourselves when necessary.
2125 */
2126 sb->s_flags |= MS_POSIXACL;
2127 sb->s_time_gran = 1;
2128 }
2129
2130 sb->s_op = &nfs_sops;
2131 nfs_initialise_sb(sb);
2132 }
2133
2134 /*
2135 * Finish setting up a cloned NFS2/3 superblock
2136 */
2137 static void nfs_clone_super(struct super_block *sb,
2138 const struct super_block *old_sb)
2139 {
2140 struct nfs_server *server = NFS_SB(sb);
2141
2142 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2143 sb->s_blocksize = old_sb->s_blocksize;
2144 sb->s_maxbytes = old_sb->s_maxbytes;
2145
2146 if (server->nfs_client->rpc_ops->version == 3) {
2147 /* The VFS shouldn't apply the umask to mode bits. We will do
2148 * so ourselves when necessary.
2149 */
2150 sb->s_flags |= MS_POSIXACL;
2151 sb->s_time_gran = 1;
2152 }
2153
2154 sb->s_op = old_sb->s_op;
2155 nfs_initialise_sb(sb);
2156 }
2157
2158 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2159 {
2160 const struct nfs_server *a = s->s_fs_info;
2161 const struct rpc_clnt *clnt_a = a->client;
2162 const struct rpc_clnt *clnt_b = b->client;
2163
2164 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2165 goto Ebusy;
2166 if (a->nfs_client != b->nfs_client)
2167 goto Ebusy;
2168 if (a->flags != b->flags)
2169 goto Ebusy;
2170 if (a->wsize != b->wsize)
2171 goto Ebusy;
2172 if (a->rsize != b->rsize)
2173 goto Ebusy;
2174 if (a->acregmin != b->acregmin)
2175 goto Ebusy;
2176 if (a->acregmax != b->acregmax)
2177 goto Ebusy;
2178 if (a->acdirmin != b->acdirmin)
2179 goto Ebusy;
2180 if (a->acdirmax != b->acdirmax)
2181 goto Ebusy;
2182 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2183 goto Ebusy;
2184 return 1;
2185 Ebusy:
2186 return 0;
2187 }
2188
2189 struct nfs_sb_mountdata {
2190 struct nfs_server *server;
2191 int mntflags;
2192 };
2193
2194 static int nfs_set_super(struct super_block *s, void *data)
2195 {
2196 struct nfs_sb_mountdata *sb_mntdata = data;
2197 struct nfs_server *server = sb_mntdata->server;
2198 int ret;
2199
2200 s->s_flags = sb_mntdata->mntflags;
2201 s->s_fs_info = server;
2202 ret = set_anon_super(s, server);
2203 if (ret == 0)
2204 server->s_dev = s->s_dev;
2205 return ret;
2206 }
2207
2208 static int nfs_compare_super_address(struct nfs_server *server1,
2209 struct nfs_server *server2)
2210 {
2211 struct sockaddr *sap1, *sap2;
2212
2213 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2214 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2215
2216 if (sap1->sa_family != sap2->sa_family)
2217 return 0;
2218
2219 switch (sap1->sa_family) {
2220 case AF_INET: {
2221 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2222 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2223 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2224 return 0;
2225 if (sin1->sin_port != sin2->sin_port)
2226 return 0;
2227 break;
2228 }
2229 case AF_INET6: {
2230 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2231 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2232 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2233 return 0;
2234 if (sin1->sin6_port != sin2->sin6_port)
2235 return 0;
2236 break;
2237 }
2238 default:
2239 return 0;
2240 }
2241
2242 return 1;
2243 }
2244
2245 static int nfs_compare_super(struct super_block *sb, void *data)
2246 {
2247 struct nfs_sb_mountdata *sb_mntdata = data;
2248 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2249 int mntflags = sb_mntdata->mntflags;
2250
2251 if (!nfs_compare_super_address(old, server))
2252 return 0;
2253 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2254 if (old->flags & NFS_MOUNT_UNSHARED)
2255 return 0;
2256 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2257 return 0;
2258 return nfs_compare_mount_options(sb, server, mntflags);
2259 }
2260
2261 static int nfs_bdi_register(struct nfs_server *server)
2262 {
2263 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2264 }
2265
2266 static int nfs_get_sb(struct file_system_type *fs_type,
2267 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2268 {
2269 struct nfs_server *server = NULL;
2270 struct super_block *s;
2271 struct nfs_parsed_mount_data *data;
2272 struct nfs_fh *mntfh;
2273 struct dentry *mntroot;
2274 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2275 struct nfs_sb_mountdata sb_mntdata = {
2276 .mntflags = flags,
2277 };
2278 int error = -ENOMEM;
2279
2280 data = nfs_alloc_parsed_mount_data(3);
2281 mntfh = nfs_alloc_fhandle();
2282 if (data == NULL || mntfh == NULL)
2283 goto out_free_fh;
2284
2285 security_init_mnt_opts(&data->lsm_opts);
2286
2287 /* Validate the mount data */
2288 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2289 if (error < 0)
2290 goto out;
2291
2292 #ifdef CONFIG_NFS_V4
2293 if (data->version == 4) {
2294 error = nfs4_try_mount(flags, dev_name, data, mnt);
2295 kfree(data->client_address);
2296 kfree(data->nfs_server.export_path);
2297 goto out;
2298 }
2299 #endif /* CONFIG_NFS_V4 */
2300
2301 /* Get a volume representation */
2302 server = nfs_create_server(data, mntfh);
2303 if (IS_ERR(server)) {
2304 error = PTR_ERR(server);
2305 goto out;
2306 }
2307 sb_mntdata.server = server;
2308
2309 if (server->flags & NFS_MOUNT_UNSHARED)
2310 compare_super = NULL;
2311
2312 /* Get a superblock - note that we may end up sharing one that already exists */
2313 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2314 if (IS_ERR(s)) {
2315 error = PTR_ERR(s);
2316 goto out_err_nosb;
2317 }
2318
2319 if (s->s_fs_info != server) {
2320 nfs_free_server(server);
2321 server = NULL;
2322 } else {
2323 error = nfs_bdi_register(server);
2324 if (error)
2325 goto error_splat_bdi;
2326 }
2327
2328 if (!s->s_root) {
2329 /* initial superblock/root creation */
2330 nfs_fill_super(s, data);
2331 nfs_fscache_get_super_cookie(
2332 s, data ? data->fscache_uniq : NULL, NULL);
2333 }
2334
2335 mntroot = nfs_get_root(s, mntfh);
2336 if (IS_ERR(mntroot)) {
2337 error = PTR_ERR(mntroot);
2338 goto error_splat_super;
2339 }
2340
2341 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2342 if (error)
2343 goto error_splat_root;
2344
2345 s->s_flags |= MS_ACTIVE;
2346 mnt->mnt_sb = s;
2347 mnt->mnt_root = mntroot;
2348 error = 0;
2349
2350 out:
2351 kfree(data->nfs_server.hostname);
2352 kfree(data->mount_server.hostname);
2353 kfree(data->fscache_uniq);
2354 security_free_mnt_opts(&data->lsm_opts);
2355 out_free_fh:
2356 nfs_free_fhandle(mntfh);
2357 kfree(data);
2358 return error;
2359
2360 out_err_nosb:
2361 nfs_free_server(server);
2362 goto out;
2363
2364 error_splat_root:
2365 dput(mntroot);
2366 error_splat_super:
2367 if (server && !s->s_root)
2368 bdi_unregister(&server->backing_dev_info);
2369 error_splat_bdi:
2370 deactivate_locked_super(s);
2371 goto out;
2372 }
2373
2374 /*
2375 * Ensure that we unregister the bdi before kill_anon_super
2376 * releases the device name
2377 */
2378 static void nfs_put_super(struct super_block *s)
2379 {
2380 struct nfs_server *server = NFS_SB(s);
2381
2382 bdi_unregister(&server->backing_dev_info);
2383 }
2384
2385 /*
2386 * Destroy an NFS2/3 superblock
2387 */
2388 static void nfs_kill_super(struct super_block *s)
2389 {
2390 struct nfs_server *server = NFS_SB(s);
2391
2392 kill_anon_super(s);
2393 nfs_fscache_release_super_cookie(s);
2394 nfs_free_server(server);
2395 }
2396
2397 /*
2398 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2399 */
2400 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2401 const char *dev_name, void *raw_data,
2402 struct vfsmount *mnt)
2403 {
2404 struct nfs_clone_mount *data = raw_data;
2405 struct super_block *s;
2406 struct nfs_server *server;
2407 struct dentry *mntroot;
2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2409 struct nfs_sb_mountdata sb_mntdata = {
2410 .mntflags = flags,
2411 };
2412 int error;
2413
2414 dprintk("--> nfs_xdev_get_sb()\n");
2415
2416 /* create a new volume representation */
2417 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2418 if (IS_ERR(server)) {
2419 error = PTR_ERR(server);
2420 goto out_err_noserver;
2421 }
2422 sb_mntdata.server = server;
2423
2424 if (server->flags & NFS_MOUNT_UNSHARED)
2425 compare_super = NULL;
2426
2427 /* Get a superblock - note that we may end up sharing one that already exists */
2428 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2429 if (IS_ERR(s)) {
2430 error = PTR_ERR(s);
2431 goto out_err_nosb;
2432 }
2433
2434 if (s->s_fs_info != server) {
2435 nfs_free_server(server);
2436 server = NULL;
2437 } else {
2438 error = nfs_bdi_register(server);
2439 if (error)
2440 goto error_splat_bdi;
2441 }
2442
2443 if (!s->s_root) {
2444 /* initial superblock/root creation */
2445 nfs_clone_super(s, data->sb);
2446 nfs_fscache_get_super_cookie(s, NULL, data);
2447 }
2448
2449 mntroot = nfs_get_root(s, data->fh);
2450 if (IS_ERR(mntroot)) {
2451 error = PTR_ERR(mntroot);
2452 goto error_splat_super;
2453 }
2454 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2455 dput(mntroot);
2456 error = -ESTALE;
2457 goto error_splat_super;
2458 }
2459
2460 s->s_flags |= MS_ACTIVE;
2461 mnt->mnt_sb = s;
2462 mnt->mnt_root = mntroot;
2463
2464 /* clone any lsm security options from the parent to the new sb */
2465 security_sb_clone_mnt_opts(data->sb, s);
2466
2467 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2468 return 0;
2469
2470 out_err_nosb:
2471 nfs_free_server(server);
2472 out_err_noserver:
2473 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2474 return error;
2475
2476 error_splat_super:
2477 if (server && !s->s_root)
2478 bdi_unregister(&server->backing_dev_info);
2479 error_splat_bdi:
2480 deactivate_locked_super(s);
2481 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2482 return error;
2483 }
2484
2485 #ifdef CONFIG_NFS_V4
2486
2487 /*
2488 * Finish setting up a cloned NFS4 superblock
2489 */
2490 static void nfs4_clone_super(struct super_block *sb,
2491 const struct super_block *old_sb)
2492 {
2493 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2494 sb->s_blocksize = old_sb->s_blocksize;
2495 sb->s_maxbytes = old_sb->s_maxbytes;
2496 sb->s_time_gran = 1;
2497 sb->s_op = old_sb->s_op;
2498 nfs_initialise_sb(sb);
2499 }
2500
2501 /*
2502 * Set up an NFS4 superblock
2503 */
2504 static void nfs4_fill_super(struct super_block *sb)
2505 {
2506 sb->s_time_gran = 1;
2507 sb->s_op = &nfs4_sops;
2508 nfs_initialise_sb(sb);
2509 }
2510
2511 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2512 {
2513 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2514 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2515 }
2516
2517 static int nfs4_validate_text_mount_data(void *options,
2518 struct nfs_parsed_mount_data *args,
2519 const char *dev_name)
2520 {
2521 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2522
2523 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
2524
2525 nfs_validate_transport_protocol(args);
2526
2527 nfs4_validate_mount_flags(args);
2528
2529 if (args->version != 4) {
2530 dfprintk(MOUNT,
2531 "NFS4: Illegal mount version\n");
2532 return -EINVAL;
2533 }
2534
2535 if (args->auth_flavor_len > 1) {
2536 dfprintk(MOUNT,
2537 "NFS4: Too many RPC auth flavours specified\n");
2538 return -EINVAL;
2539 }
2540
2541 if (args->client_address == NULL) {
2542 dfprintk(MOUNT,
2543 "NFS4: mount program didn't pass callback address\n");
2544 return -EINVAL;
2545 }
2546
2547 return nfs_parse_devname(dev_name,
2548 &args->nfs_server.hostname,
2549 NFS4_MAXNAMLEN,
2550 &args->nfs_server.export_path,
2551 NFS4_MAXPATHLEN);
2552 }
2553
2554 /*
2555 * Validate NFSv4 mount options
2556 */
2557 static int nfs4_validate_mount_data(void *options,
2558 struct nfs_parsed_mount_data *args,
2559 const char *dev_name)
2560 {
2561 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2562 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2563 char *c;
2564
2565 if (data == NULL)
2566 goto out_no_data;
2567
2568 switch (data->version) {
2569 case 1:
2570 if (data->host_addrlen > sizeof(args->nfs_server.address))
2571 goto out_no_address;
2572 if (data->host_addrlen == 0)
2573 goto out_no_address;
2574 args->nfs_server.addrlen = data->host_addrlen;
2575 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2576 return -EFAULT;
2577 if (!nfs_verify_server_address(sap))
2578 goto out_no_address;
2579
2580 if (data->auth_flavourlen) {
2581 if (data->auth_flavourlen > 1)
2582 goto out_inval_auth;
2583 if (copy_from_user(&args->auth_flavors[0],
2584 data->auth_flavours,
2585 sizeof(args->auth_flavors[0])))
2586 return -EFAULT;
2587 }
2588
2589 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2590 if (IS_ERR(c))
2591 return PTR_ERR(c);
2592 args->nfs_server.hostname = c;
2593
2594 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2595 if (IS_ERR(c))
2596 return PTR_ERR(c);
2597 args->nfs_server.export_path = c;
2598 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2599
2600 c = strndup_user(data->client_addr.data, 16);
2601 if (IS_ERR(c))
2602 return PTR_ERR(c);
2603 args->client_address = c;
2604
2605 /*
2606 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2607 * can deal with.
2608 */
2609
2610 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2611 args->rsize = data->rsize;
2612 args->wsize = data->wsize;
2613 args->timeo = data->timeo;
2614 args->retrans = data->retrans;
2615 args->acregmin = data->acregmin;
2616 args->acregmax = data->acregmax;
2617 args->acdirmin = data->acdirmin;
2618 args->acdirmax = data->acdirmax;
2619 args->nfs_server.protocol = data->proto;
2620 nfs_validate_transport_protocol(args);
2621
2622 break;
2623 default:
2624 if (nfs_parse_mount_options((char *)options, args) == 0)
2625 return -EINVAL;
2626
2627 if (!nfs_verify_server_address(sap))
2628 return -EINVAL;
2629
2630 return nfs4_validate_text_mount_data(options, args, dev_name);
2631 }
2632
2633 return 0;
2634
2635 out_no_data:
2636 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2637 return -EINVAL;
2638
2639 out_inval_auth:
2640 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2641 data->auth_flavourlen);
2642 return -EINVAL;
2643
2644 out_no_address:
2645 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2646 return -EINVAL;
2647 }
2648
2649 /*
2650 * Get the superblock for the NFS4 root partition
2651 */
2652 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2653 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2654 {
2655 struct nfs_parsed_mount_data *data = raw_data;
2656 struct super_block *s;
2657 struct nfs_server *server;
2658 struct nfs_fh *mntfh;
2659 struct dentry *mntroot;
2660 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2661 struct nfs_sb_mountdata sb_mntdata = {
2662 .mntflags = flags,
2663 };
2664 int error = -ENOMEM;
2665
2666 mntfh = nfs_alloc_fhandle();
2667 if (data == NULL || mntfh == NULL)
2668 goto out_free_fh;
2669
2670 security_init_mnt_opts(&data->lsm_opts);
2671
2672 /* Get a volume representation */
2673 server = nfs4_create_server(data, mntfh);
2674 if (IS_ERR(server)) {
2675 error = PTR_ERR(server);
2676 goto out;
2677 }
2678 sb_mntdata.server = server;
2679
2680 if (server->flags & NFS4_MOUNT_UNSHARED)
2681 compare_super = NULL;
2682
2683 /* Get a superblock - note that we may end up sharing one that already exists */
2684 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2685 if (IS_ERR(s)) {
2686 error = PTR_ERR(s);
2687 goto out_free;
2688 }
2689
2690 if (s->s_fs_info != server) {
2691 nfs_free_server(server);
2692 server = NULL;
2693 } else {
2694 error = nfs_bdi_register(server);
2695 if (error)
2696 goto error_splat_bdi;
2697 }
2698
2699 if (!s->s_root) {
2700 /* initial superblock/root creation */
2701 nfs4_fill_super(s);
2702 nfs_fscache_get_super_cookie(
2703 s, data ? data->fscache_uniq : NULL, NULL);
2704 }
2705
2706 mntroot = nfs4_get_root(s, mntfh);
2707 if (IS_ERR(mntroot)) {
2708 error = PTR_ERR(mntroot);
2709 goto error_splat_super;
2710 }
2711
2712 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2713 if (error)
2714 goto error_splat_root;
2715
2716 s->s_flags |= MS_ACTIVE;
2717 mnt->mnt_sb = s;
2718 mnt->mnt_root = mntroot;
2719 error = 0;
2720
2721 out:
2722 security_free_mnt_opts(&data->lsm_opts);
2723 out_free_fh:
2724 nfs_free_fhandle(mntfh);
2725 return error;
2726
2727 out_free:
2728 nfs_free_server(server);
2729 goto out;
2730
2731 error_splat_root:
2732 dput(mntroot);
2733 error_splat_super:
2734 if (server && !s->s_root)
2735 bdi_unregister(&server->backing_dev_info);
2736 error_splat_bdi:
2737 deactivate_locked_super(s);
2738 goto out;
2739 }
2740
2741 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2742 int flags, void *data, const char *hostname)
2743 {
2744 struct vfsmount *root_mnt;
2745 char *root_devname;
2746 size_t len;
2747
2748 len = strlen(hostname) + 3;
2749 root_devname = kmalloc(len, GFP_KERNEL);
2750 if (root_devname == NULL)
2751 return ERR_PTR(-ENOMEM);
2752 snprintf(root_devname, len, "%s:/", hostname);
2753 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2754 kfree(root_devname);
2755 return root_mnt;
2756 }
2757
2758 static void nfs_fix_devname(const struct path *path, struct vfsmount *mnt)
2759 {
2760 char *page = (char *) __get_free_page(GFP_KERNEL);
2761 char *devname, *tmp;
2762
2763 if (page == NULL)
2764 return;
2765 devname = nfs_path(path->mnt->mnt_devname,
2766 path->mnt->mnt_root, path->dentry,
2767 page, PAGE_SIZE);
2768 if (IS_ERR(devname))
2769 goto out_freepage;
2770 tmp = kstrdup(devname, GFP_KERNEL);
2771 if (tmp == NULL)
2772 goto out_freepage;
2773 kfree(mnt->mnt_devname);
2774 mnt->mnt_devname = tmp;
2775 out_freepage:
2776 free_page((unsigned long)page);
2777 }
2778
2779 struct nfs_referral_count {
2780 struct list_head list;
2781 const struct task_struct *task;
2782 unsigned int referral_count;
2783 };
2784
2785 static LIST_HEAD(nfs_referral_count_list);
2786 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2787
2788 static struct nfs_referral_count *nfs_find_referral_count(void)
2789 {
2790 struct nfs_referral_count *p;
2791
2792 list_for_each_entry(p, &nfs_referral_count_list, list) {
2793 if (p->task == current)
2794 return p;
2795 }
2796 return NULL;
2797 }
2798
2799 #define NFS_MAX_NESTED_REFERRALS 2
2800
2801 static int nfs_referral_loop_protect(void)
2802 {
2803 struct nfs_referral_count *p, *new;
2804 int ret = -ENOMEM;
2805
2806 new = kmalloc(sizeof(*new), GFP_KERNEL);
2807 if (!new)
2808 goto out;
2809 new->task = current;
2810 new->referral_count = 1;
2811
2812 ret = 0;
2813 spin_lock(&nfs_referral_count_list_lock);
2814 p = nfs_find_referral_count();
2815 if (p != NULL) {
2816 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2817 ret = -ELOOP;
2818 else
2819 p->referral_count++;
2820 } else {
2821 list_add(&new->list, &nfs_referral_count_list);
2822 new = NULL;
2823 }
2824 spin_unlock(&nfs_referral_count_list_lock);
2825 kfree(new);
2826 out:
2827 return ret;
2828 }
2829
2830 static void nfs_referral_loop_unprotect(void)
2831 {
2832 struct nfs_referral_count *p;
2833
2834 spin_lock(&nfs_referral_count_list_lock);
2835 p = nfs_find_referral_count();
2836 p->referral_count--;
2837 if (p->referral_count == 0)
2838 list_del(&p->list);
2839 else
2840 p = NULL;
2841 spin_unlock(&nfs_referral_count_list_lock);
2842 kfree(p);
2843 }
2844
2845 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2846 const char *export_path, struct vfsmount *mnt_target)
2847 {
2848 struct nameidata *nd = NULL;
2849 struct mnt_namespace *ns_private;
2850 struct super_block *s;
2851 int ret;
2852
2853 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2854 if (nd == NULL)
2855 return -ENOMEM;
2856
2857 ns_private = create_mnt_ns(root_mnt);
2858 ret = PTR_ERR(ns_private);
2859 if (IS_ERR(ns_private))
2860 goto out_mntput;
2861
2862 ret = nfs_referral_loop_protect();
2863 if (ret != 0)
2864 goto out_put_mnt_ns;
2865
2866 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2867 export_path, LOOKUP_FOLLOW, nd);
2868
2869 nfs_referral_loop_unprotect();
2870 put_mnt_ns(ns_private);
2871
2872 if (ret != 0)
2873 goto out_err;
2874
2875 s = nd->path.mnt->mnt_sb;
2876 atomic_inc(&s->s_active);
2877 mnt_target->mnt_sb = s;
2878 mnt_target->mnt_root = dget(nd->path.dentry);
2879
2880 /* Correct the device pathname */
2881 nfs_fix_devname(&nd->path, mnt_target);
2882
2883 path_put(&nd->path);
2884 kfree(nd);
2885 down_write(&s->s_umount);
2886 return 0;
2887 out_put_mnt_ns:
2888 put_mnt_ns(ns_private);
2889 out_mntput:
2890 mntput(root_mnt);
2891 out_err:
2892 kfree(nd);
2893 return ret;
2894 }
2895
2896 static int nfs4_try_mount(int flags, const char *dev_name,
2897 struct nfs_parsed_mount_data *data,
2898 struct vfsmount *mnt)
2899 {
2900 char *export_path;
2901 struct vfsmount *root_mnt;
2902 int error;
2903
2904 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2905
2906 export_path = data->nfs_server.export_path;
2907 data->nfs_server.export_path = "/";
2908 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2909 data->nfs_server.hostname);
2910 data->nfs_server.export_path = export_path;
2911
2912 error = PTR_ERR(root_mnt);
2913 if (IS_ERR(root_mnt))
2914 goto out;
2915
2916 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2917
2918 out:
2919 dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n", error,
2920 error != 0 ? " [error]" : "");
2921 return error;
2922 }
2923
2924 /*
2925 * Get the superblock for an NFS4 mountpoint
2926 */
2927 static int nfs4_get_sb(struct file_system_type *fs_type,
2928 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2929 {
2930 struct nfs_parsed_mount_data *data;
2931 int error = -ENOMEM;
2932
2933 data = nfs_alloc_parsed_mount_data(4);
2934 if (data == NULL)
2935 goto out_free_data;
2936
2937 /* Validate the mount data */
2938 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2939 if (error < 0)
2940 goto out;
2941
2942 error = nfs4_try_mount(flags, dev_name, data, mnt);
2943
2944 out:
2945 kfree(data->client_address);
2946 kfree(data->nfs_server.export_path);
2947 kfree(data->nfs_server.hostname);
2948 kfree(data->fscache_uniq);
2949 out_free_data:
2950 kfree(data);
2951 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2952 error != 0 ? " [error]" : "");
2953 return error;
2954 }
2955
2956 static void nfs4_kill_super(struct super_block *sb)
2957 {
2958 struct nfs_server *server = NFS_SB(sb);
2959
2960 dprintk("--> %s\n", __func__);
2961 nfs_super_return_all_delegations(sb);
2962 kill_anon_super(sb);
2963 nfs_fscache_release_super_cookie(sb);
2964 nfs_free_server(server);
2965 dprintk("<-- %s\n", __func__);
2966 }
2967
2968 /*
2969 * Clone an NFS4 server record on xdev traversal (FSID-change)
2970 */
2971 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2972 const char *dev_name, void *raw_data,
2973 struct vfsmount *mnt)
2974 {
2975 struct nfs_clone_mount *data = raw_data;
2976 struct super_block *s;
2977 struct nfs_server *server;
2978 struct dentry *mntroot;
2979 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2980 struct nfs_sb_mountdata sb_mntdata = {
2981 .mntflags = flags,
2982 };
2983 int error;
2984
2985 dprintk("--> nfs4_xdev_get_sb()\n");
2986
2987 /* create a new volume representation */
2988 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
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_clone_super(s, data->sb);
3017 nfs_fscache_get_super_cookie(s, NULL, data);
3018 }
3019
3020 mntroot = nfs4_get_root(s, data->fh);
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 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
3038 return 0;
3039
3040 out_err_nosb:
3041 nfs_free_server(server);
3042 out_err_noserver:
3043 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
3044 return error;
3045
3046 error_splat_super:
3047 if (server && !s->s_root)
3048 bdi_unregister(&server->backing_dev_info);
3049 error_splat_bdi:
3050 deactivate_locked_super(s);
3051 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
3052 return error;
3053 }
3054
3055 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
3056 int flags, const char *dev_name, void *raw_data,
3057 struct vfsmount *mnt)
3058 {
3059 struct nfs_clone_mount *data = raw_data;
3060 struct super_block *s;
3061 struct nfs_server *server;
3062 struct dentry *mntroot;
3063 struct nfs_fh *mntfh;
3064 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
3065 struct nfs_sb_mountdata sb_mntdata = {
3066 .mntflags = flags,
3067 };
3068 int error = -ENOMEM;
3069
3070 dprintk("--> nfs4_referral_get_sb()\n");
3071
3072 mntfh = nfs_alloc_fhandle();
3073 if (mntfh == NULL)
3074 goto out_err_nofh;
3075
3076 /* create a new volume representation */
3077 server = nfs4_create_referral_server(data, mntfh);
3078 if (IS_ERR(server)) {
3079 error = PTR_ERR(server);
3080 goto out_err_noserver;
3081 }
3082 sb_mntdata.server = server;
3083
3084 if (server->flags & NFS4_MOUNT_UNSHARED)
3085 compare_super = NULL;
3086
3087 /* Get a superblock - note that we may end up sharing one that already exists */
3088 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
3089 if (IS_ERR(s)) {
3090 error = PTR_ERR(s);
3091 goto out_err_nosb;
3092 }
3093
3094 if (s->s_fs_info != server) {
3095 nfs_free_server(server);
3096 server = NULL;
3097 } else {
3098 error = nfs_bdi_register(server);
3099 if (error)
3100 goto error_splat_bdi;
3101 }
3102
3103 if (!s->s_root) {
3104 /* initial superblock/root creation */
3105 nfs4_fill_super(s);
3106 nfs_fscache_get_super_cookie(s, NULL, data);
3107 }
3108
3109 mntroot = nfs4_get_root(s, mntfh);
3110 if (IS_ERR(mntroot)) {
3111 error = PTR_ERR(mntroot);
3112 goto error_splat_super;
3113 }
3114 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3115 dput(mntroot);
3116 error = -ESTALE;
3117 goto error_splat_super;
3118 }
3119
3120 s->s_flags |= MS_ACTIVE;
3121 mnt->mnt_sb = s;
3122 mnt->mnt_root = mntroot;
3123
3124 security_sb_clone_mnt_opts(data->sb, s);
3125
3126 nfs_free_fhandle(mntfh);
3127 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3128 return 0;
3129
3130 out_err_nosb:
3131 nfs_free_server(server);
3132 out_err_noserver:
3133 nfs_free_fhandle(mntfh);
3134 out_err_nofh:
3135 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
3136 return error;
3137
3138 error_splat_super:
3139 if (server && !s->s_root)
3140 bdi_unregister(&server->backing_dev_info);
3141 error_splat_bdi:
3142 deactivate_locked_super(s);
3143 nfs_free_fhandle(mntfh);
3144 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
3145 return error;
3146 }
3147
3148 /*
3149 * Create an NFS4 server record on referral traversal
3150 */
3151 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
3152 int flags, const char *dev_name, void *raw_data,
3153 struct vfsmount *mnt)
3154 {
3155 struct nfs_clone_mount *data = raw_data;
3156 char *export_path;
3157 struct vfsmount *root_mnt;
3158 int error;
3159
3160 dprintk("--> nfs4_referral_get_sb()\n");
3161
3162 export_path = data->mnt_path;
3163 data->mnt_path = "/";
3164
3165 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3166 flags, data, data->hostname);
3167 data->mnt_path = export_path;
3168
3169 error = PTR_ERR(root_mnt);
3170 if (IS_ERR(root_mnt))
3171 goto out;
3172
3173 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
3174 out:
3175 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
3176 error != 0 ? " [error]" : "");
3177 return error;
3178 }
3179
3180 #endif /* CONFIG_NFS_V4 */
linux-next