projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
NFS: Allocate parsed mount data directly to the nfs_mount_info structure
[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/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
50 #include <net/ipv6.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
57
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 #define NFS_TEXT_DATA 1
70
71 #ifdef CONFIG_NFS_V3
72 #define NFS_DEFAULT_VERSION 3
73 #else
74 #define NFS_DEFAULT_VERSION 2
75 #endif
76
77 enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
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_minorversion,
102
103 /* Mount options that take string arguments */
104 Opt_nfsvers,
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_udp, "udp" },
137 { Opt_tcp, "tcp" },
138 { Opt_rdma, "rdma" },
139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
147 { Opt_fscache, "fsc" },
148 { Opt_nofscache, "nofsc" },
149
150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
164 { Opt_minorversion, "minorversion=%s" },
165
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
174 { Opt_mounthost, "mounthost=%s" },
175 { Opt_mountaddr, "mountaddr=%s" },
176
177 { Opt_lookupcache, "lookupcache=%s" },
178 { Opt_fscache_uniq, "fsc=%s" },
179 { Opt_local_lock, "local_lock=%s" },
180
181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
184 { Opt_err, NULL }
185 };
186
187 enum {
188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
189
190 Opt_xprt_err
191 };
192
193 static const match_table_t nfs_xprt_protocol_tokens = {
194 { Opt_xprt_udp, "udp" },
195 { Opt_xprt_udp6, "udp6" },
196 { Opt_xprt_tcp, "tcp" },
197 { Opt_xprt_tcp6, "tcp6" },
198 { Opt_xprt_rdma, "rdma" },
199
200 { Opt_xprt_err, NULL }
201 };
202
203 enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210 };
211
212 static const match_table_t nfs_secflavor_tokens = {
213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
229 { Opt_sec_err, NULL }
230 };
231
232 enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237 };
238
239 static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246 };
247
248 enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253 };
254
255 static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262 };
263
264 enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269 };
270
271 static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279 };
280
281 struct nfs_mount_info {
282 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
284 struct nfs_parsed_mount_data *parsed;
285 struct nfs_clone_mount *cloned;
286 };
287
288 static void nfs_umount_begin(struct super_block *);
289 static int nfs_statfs(struct dentry *, struct kstatfs *);
290 static int nfs_show_options(struct seq_file *, struct dentry *);
291 static int nfs_show_devname(struct seq_file *, struct dentry *);
292 static int nfs_show_path(struct seq_file *, struct dentry *);
293 static int nfs_show_stats(struct seq_file *, struct dentry *);
294 static struct dentry *nfs_fs_mount_common(struct file_system_type *,
295 struct nfs_server *, int, const char *, struct nfs_fh *,
296 struct nfs_mount_info *);
297 static struct dentry *nfs_fs_mount(struct file_system_type *,
298 int, const char *, void *);
299 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
300 int flags, const char *dev_name, void *raw_data);
301 static void nfs_put_super(struct super_block *);
302 static void nfs_kill_super(struct super_block *);
303 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
304
305 static struct file_system_type nfs_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs",
308 .mount = nfs_fs_mount,
309 .kill_sb = nfs_kill_super,
310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
311 };
312
313 struct file_system_type nfs_xdev_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "nfs",
316 .mount = nfs_xdev_mount,
317 .kill_sb = nfs_kill_super,
318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
319 };
320
321 static const struct super_operations nfs_sops = {
322 .alloc_inode = nfs_alloc_inode,
323 .destroy_inode = nfs_destroy_inode,
324 .write_inode = nfs_write_inode,
325 .put_super = nfs_put_super,
326 .statfs = nfs_statfs,
327 .evict_inode = nfs_evict_inode,
328 .umount_begin = nfs_umount_begin,
329 .show_options = nfs_show_options,
330 .show_devname = nfs_show_devname,
331 .show_path = nfs_show_path,
332 .show_stats = nfs_show_stats,
333 .remount_fs = nfs_remount,
334 };
335
336 #ifdef CONFIG_NFS_V4
337 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
338 static int nfs4_validate_mount_data(void *options,
339 struct nfs_parsed_mount_data *args, const char *dev_name);
340 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
341 struct nfs_parsed_mount_data *data);
342 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
344 static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
346 static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
348 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
350 static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
351 int flags, const char *dev_name, void *raw_data);
352 static void nfs4_kill_super(struct super_block *sb);
353
354 static struct file_system_type nfs4_fs_type = {
355 .owner = THIS_MODULE,
356 .name = "nfs4",
357 .mount = nfs4_mount,
358 .kill_sb = nfs4_kill_super,
359 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
360 };
361
362 static struct file_system_type nfs4_remote_fs_type = {
363 .owner = THIS_MODULE,
364 .name = "nfs4",
365 .mount = nfs4_remote_mount,
366 .kill_sb = nfs4_kill_super,
367 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
368 };
369
370 struct file_system_type nfs4_xdev_fs_type = {
371 .owner = THIS_MODULE,
372 .name = "nfs4",
373 .mount = nfs4_xdev_mount,
374 .kill_sb = nfs4_kill_super,
375 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
376 };
377
378 static struct file_system_type nfs4_remote_referral_fs_type = {
379 .owner = THIS_MODULE,
380 .name = "nfs4",
381 .mount = nfs4_remote_referral_mount,
382 .kill_sb = nfs4_kill_super,
383 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
384 };
385
386 struct file_system_type nfs4_referral_fs_type = {
387 .owner = THIS_MODULE,
388 .name = "nfs4",
389 .mount = nfs4_referral_mount,
390 .kill_sb = nfs4_kill_super,
391 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
392 };
393
394 static const struct super_operations nfs4_sops = {
395 .alloc_inode = nfs_alloc_inode,
396 .destroy_inode = nfs_destroy_inode,
397 .write_inode = nfs_write_inode,
398 .put_super = nfs_put_super,
399 .statfs = nfs_statfs,
400 .evict_inode = nfs4_evict_inode,
401 .umount_begin = nfs_umount_begin,
402 .show_options = nfs_show_options,
403 .show_devname = nfs_show_devname,
404 .show_path = nfs_show_path,
405 .show_stats = nfs_show_stats,
406 .remount_fs = nfs_remount,
407 };
408 #endif
409
410 static struct shrinker acl_shrinker = {
411 .shrink = nfs_access_cache_shrinker,
412 .seeks = DEFAULT_SEEKS,
413 };
414
415 /*
416 * Register the NFS filesystems
417 */
418 int __init register_nfs_fs(void)
419 {
420 int ret;
421
422 ret = register_filesystem(&nfs_fs_type);
423 if (ret < 0)
424 goto error_0;
425
426 ret = nfs_register_sysctl();
427 if (ret < 0)
428 goto error_1;
429 #ifdef CONFIG_NFS_V4
430 ret = register_filesystem(&nfs4_fs_type);
431 if (ret < 0)
432 goto error_2;
433 #endif
434 register_shrinker(&acl_shrinker);
435 return 0;
436
437 #ifdef CONFIG_NFS_V4
438 error_2:
439 nfs_unregister_sysctl();
440 #endif
441 error_1:
442 unregister_filesystem(&nfs_fs_type);
443 error_0:
444 return ret;
445 }
446
447 /*
448 * Unregister the NFS filesystems
449 */
450 void __exit unregister_nfs_fs(void)
451 {
452 unregister_shrinker(&acl_shrinker);
453 #ifdef CONFIG_NFS_V4
454 unregister_filesystem(&nfs4_fs_type);
455 #endif
456 nfs_unregister_sysctl();
457 unregister_filesystem(&nfs_fs_type);
458 }
459
460 void nfs_sb_active(struct super_block *sb)
461 {
462 struct nfs_server *server = NFS_SB(sb);
463
464 if (atomic_inc_return(&server->active) == 1)
465 atomic_inc(&sb->s_active);
466 }
467
468 void nfs_sb_deactive(struct super_block *sb)
469 {
470 struct nfs_server *server = NFS_SB(sb);
471
472 if (atomic_dec_and_test(&server->active))
473 deactivate_super(sb);
474 }
475
476 /*
477 * Deliver file system statistics to userspace
478 */
479 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
480 {
481 struct nfs_server *server = NFS_SB(dentry->d_sb);
482 unsigned char blockbits;
483 unsigned long blockres;
484 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
485 struct nfs_fsstat res;
486 int error = -ENOMEM;
487
488 res.fattr = nfs_alloc_fattr();
489 if (res.fattr == NULL)
490 goto out_err;
491
492 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
493 if (unlikely(error == -ESTALE)) {
494 struct dentry *pd_dentry;
495
496 pd_dentry = dget_parent(dentry);
497 if (pd_dentry != NULL) {
498 nfs_zap_caches(pd_dentry->d_inode);
499 dput(pd_dentry);
500 }
501 }
502 nfs_free_fattr(res.fattr);
503 if (error < 0)
504 goto out_err;
505
506 buf->f_type = NFS_SUPER_MAGIC;
507
508 /*
509 * Current versions of glibc do not correctly handle the
510 * case where f_frsize != f_bsize. Eventually we want to
511 * report the value of wtmult in this field.
512 */
513 buf->f_frsize = dentry->d_sb->s_blocksize;
514
515 /*
516 * On most *nix systems, f_blocks, f_bfree, and f_bavail
517 * are reported in units of f_frsize. Linux hasn't had
518 * an f_frsize field in its statfs struct until recently,
519 * thus historically Linux's sys_statfs reports these
520 * fields in units of f_bsize.
521 */
522 buf->f_bsize = dentry->d_sb->s_blocksize;
523 blockbits = dentry->d_sb->s_blocksize_bits;
524 blockres = (1 << blockbits) - 1;
525 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
526 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
527 buf->f_bavail = (res.abytes + blockres) >> blockbits;
528
529 buf->f_files = res.tfiles;
530 buf->f_ffree = res.afiles;
531
532 buf->f_namelen = server->namelen;
533
534 return 0;
535
536 out_err:
537 dprintk("%s: statfs error = %d\n", __func__, -error);
538 return error;
539 }
540
541 /*
542 * Map the security flavour number to a name
543 */
544 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
545 {
546 static const struct {
547 rpc_authflavor_t flavour;
548 const char *str;
549 } sec_flavours[] = {
550 { RPC_AUTH_NULL, "null" },
551 { RPC_AUTH_UNIX, "sys" },
552 { RPC_AUTH_GSS_KRB5, "krb5" },
553 { RPC_AUTH_GSS_KRB5I, "krb5i" },
554 { RPC_AUTH_GSS_KRB5P, "krb5p" },
555 { RPC_AUTH_GSS_LKEY, "lkey" },
556 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
557 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
558 { RPC_AUTH_GSS_SPKM, "spkm" },
559 { RPC_AUTH_GSS_SPKMI, "spkmi" },
560 { RPC_AUTH_GSS_SPKMP, "spkmp" },
561 { UINT_MAX, "unknown" }
562 };
563 int i;
564
565 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
566 if (sec_flavours[i].flavour == flavour)
567 break;
568 }
569 return sec_flavours[i].str;
570 }
571
572 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
573 int showdefaults)
574 {
575 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
576
577 seq_printf(m, ",mountproto=");
578 switch (sap->sa_family) {
579 case AF_INET:
580 switch (nfss->mountd_protocol) {
581 case IPPROTO_UDP:
582 seq_printf(m, RPCBIND_NETID_UDP);
583 break;
584 case IPPROTO_TCP:
585 seq_printf(m, RPCBIND_NETID_TCP);
586 break;
587 default:
588 if (showdefaults)
589 seq_printf(m, "auto");
590 }
591 break;
592 case AF_INET6:
593 switch (nfss->mountd_protocol) {
594 case IPPROTO_UDP:
595 seq_printf(m, RPCBIND_NETID_UDP6);
596 break;
597 case IPPROTO_TCP:
598 seq_printf(m, RPCBIND_NETID_TCP6);
599 break;
600 default:
601 if (showdefaults)
602 seq_printf(m, "auto");
603 }
604 break;
605 default:
606 if (showdefaults)
607 seq_printf(m, "auto");
608 }
609 }
610
611 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
612 int showdefaults)
613 {
614 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
615
616 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
617 return;
618
619 switch (sap->sa_family) {
620 case AF_INET: {
621 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
622 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
623 break;
624 }
625 case AF_INET6: {
626 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
627 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
628 break;
629 }
630 default:
631 if (showdefaults)
632 seq_printf(m, ",mountaddr=unspecified");
633 }
634
635 if (nfss->mountd_version || showdefaults)
636 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
637 if ((nfss->mountd_port &&
638 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
639 showdefaults)
640 seq_printf(m, ",mountport=%u", nfss->mountd_port);
641
642 nfs_show_mountd_netid(m, nfss, showdefaults);
643 }
644
645 #ifdef CONFIG_NFS_V4
646 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
647 int showdefaults)
648 {
649 struct nfs_client *clp = nfss->nfs_client;
650
651 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
652 }
653 #else
654 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
655 int showdefaults)
656 {
657 }
658 #endif
659
660 static void nfs_show_nfs_version(struct seq_file *m,
661 unsigned int version,
662 unsigned int minorversion)
663 {
664 seq_printf(m, ",vers=%u", version);
665 if (version == 4)
666 seq_printf(m, ".%u", minorversion);
667 }
668
669 /*
670 * Describe the mount options in force on this server representation
671 */
672 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
673 int showdefaults)
674 {
675 static const struct proc_nfs_info {
676 int flag;
677 const char *str;
678 const char *nostr;
679 } nfs_info[] = {
680 { NFS_MOUNT_SOFT, ",soft", ",hard" },
681 { NFS_MOUNT_POSIX, ",posix", "" },
682 { NFS_MOUNT_NOCTO, ",nocto", "" },
683 { NFS_MOUNT_NOAC, ",noac", "" },
684 { NFS_MOUNT_NONLM, ",nolock", "" },
685 { NFS_MOUNT_NOACL, ",noacl", "" },
686 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
687 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
688 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
689 { 0, NULL, NULL }
690 };
691 const struct proc_nfs_info *nfs_infop;
692 struct nfs_client *clp = nfss->nfs_client;
693 u32 version = clp->rpc_ops->version;
694 int local_flock, local_fcntl;
695
696 nfs_show_nfs_version(m, version, clp->cl_minorversion);
697 seq_printf(m, ",rsize=%u", nfss->rsize);
698 seq_printf(m, ",wsize=%u", nfss->wsize);
699 if (nfss->bsize != 0)
700 seq_printf(m, ",bsize=%u", nfss->bsize);
701 seq_printf(m, ",namlen=%u", nfss->namelen);
702 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
703 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
704 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
705 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
706 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
707 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
708 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
709 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
710 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
711 if (nfss->flags & nfs_infop->flag)
712 seq_puts(m, nfs_infop->str);
713 else
714 seq_puts(m, nfs_infop->nostr);
715 }
716 rcu_read_lock();
717 seq_printf(m, ",proto=%s",
718 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
719 rcu_read_unlock();
720 if (version == 4) {
721 if (nfss->port != NFS_PORT)
722 seq_printf(m, ",port=%u", nfss->port);
723 } else
724 if (nfss->port)
725 seq_printf(m, ",port=%u", nfss->port);
726
727 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
728 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
729 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
730
731 if (version != 4)
732 nfs_show_mountd_options(m, nfss, showdefaults);
733 else
734 nfs_show_nfsv4_options(m, nfss, showdefaults);
735
736 if (nfss->options & NFS_OPTION_FSCACHE)
737 seq_printf(m, ",fsc");
738
739 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
740 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
741 seq_printf(m, ",lookupcache=none");
742 else
743 seq_printf(m, ",lookupcache=pos");
744 }
745
746 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
747 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
748
749 if (!local_flock && !local_fcntl)
750 seq_printf(m, ",local_lock=none");
751 else if (local_flock && local_fcntl)
752 seq_printf(m, ",local_lock=all");
753 else if (local_flock)
754 seq_printf(m, ",local_lock=flock");
755 else
756 seq_printf(m, ",local_lock=posix");
757 }
758
759 /*
760 * Describe the mount options on this VFS mountpoint
761 */
762 static int nfs_show_options(struct seq_file *m, struct dentry *root)
763 {
764 struct nfs_server *nfss = NFS_SB(root->d_sb);
765
766 nfs_show_mount_options(m, nfss, 0);
767
768 rcu_read_lock();
769 seq_printf(m, ",addr=%s",
770 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
771 RPC_DISPLAY_ADDR));
772 rcu_read_unlock();
773
774 return 0;
775 }
776
777 #ifdef CONFIG_NFS_V4
778 #ifdef CONFIG_NFS_V4_1
779 static void show_sessions(struct seq_file *m, struct nfs_server *server)
780 {
781 if (nfs4_has_session(server->nfs_client))
782 seq_printf(m, ",sessions");
783 }
784 #else
785 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
786 #endif
787 #endif
788
789 #ifdef CONFIG_NFS_V4_1
790 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
791 {
792 seq_printf(m, ",pnfs=");
793 if (server->pnfs_curr_ld)
794 seq_printf(m, "%s", server->pnfs_curr_ld->name);
795 else
796 seq_printf(m, "not configured");
797 }
798
799 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
800 {
801 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
802 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
803 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
804 "date='%llu,%u'",
805 impl_id->name, impl_id->domain,
806 impl_id->date.seconds, impl_id->date.nseconds);
807 }
808 }
809 #else
810 #ifdef CONFIG_NFS_V4
811 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
812 {
813 }
814 #endif
815 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
816 {
817 }
818 #endif
819
820 static int nfs_show_devname(struct seq_file *m, struct dentry *root)
821 {
822 char *page = (char *) __get_free_page(GFP_KERNEL);
823 char *devname, *dummy;
824 int err = 0;
825 if (!page)
826 return -ENOMEM;
827 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
828 if (IS_ERR(devname))
829 err = PTR_ERR(devname);
830 else
831 seq_escape(m, devname, " \t\n\\");
832 free_page((unsigned long)page);
833 return err;
834 }
835
836 static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
837 {
838 seq_puts(m, "/");
839 return 0;
840 }
841
842 /*
843 * Present statistical information for this VFS mountpoint
844 */
845 static int nfs_show_stats(struct seq_file *m, struct dentry *root)
846 {
847 int i, cpu;
848 struct nfs_server *nfss = NFS_SB(root->d_sb);
849 struct rpc_auth *auth = nfss->client->cl_auth;
850 struct nfs_iostats totals = { };
851
852 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
853
854 /*
855 * Display all mount option settings
856 */
857 seq_printf(m, "\n\topts:\t");
858 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
859 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
860 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
861 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
862 nfs_show_mount_options(m, nfss, 1);
863
864 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
865
866 show_implementation_id(m, nfss);
867
868 seq_printf(m, "\n\tcaps:\t");
869 seq_printf(m, "caps=0x%x", nfss->caps);
870 seq_printf(m, ",wtmult=%u", nfss->wtmult);
871 seq_printf(m, ",dtsize=%u", nfss->dtsize);
872 seq_printf(m, ",bsize=%u", nfss->bsize);
873 seq_printf(m, ",namlen=%u", nfss->namelen);
874
875 #ifdef CONFIG_NFS_V4
876 if (nfss->nfs_client->rpc_ops->version == 4) {
877 seq_printf(m, "\n\tnfsv4:\t");
878 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
879 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
880 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
881 show_sessions(m, nfss);
882 show_pnfs(m, nfss);
883 }
884 #endif
885
886 /*
887 * Display security flavor in effect for this mount
888 */
889 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
890 if (auth->au_flavor)
891 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
892
893 /*
894 * Display superblock I/O counters
895 */
896 for_each_possible_cpu(cpu) {
897 struct nfs_iostats *stats;
898
899 preempt_disable();
900 stats = per_cpu_ptr(nfss->io_stats, cpu);
901
902 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
903 totals.events[i] += stats->events[i];
904 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
905 totals.bytes[i] += stats->bytes[i];
906 #ifdef CONFIG_NFS_FSCACHE
907 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
908 totals.fscache[i] += stats->fscache[i];
909 #endif
910
911 preempt_enable();
912 }
913
914 seq_printf(m, "\n\tevents:\t");
915 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
916 seq_printf(m, "%lu ", totals.events[i]);
917 seq_printf(m, "\n\tbytes:\t");
918 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
919 seq_printf(m, "%Lu ", totals.bytes[i]);
920 #ifdef CONFIG_NFS_FSCACHE
921 if (nfss->options & NFS_OPTION_FSCACHE) {
922 seq_printf(m, "\n\tfsc:\t");
923 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
924 seq_printf(m, "%Lu ", totals.bytes[i]);
925 }
926 #endif
927 seq_printf(m, "\n");
928
929 rpc_print_iostats(m, nfss->client);
930
931 return 0;
932 }
933
934 /*
935 * Begin unmount by attempting to remove all automounted mountpoints we added
936 * in response to xdev traversals and referrals
937 */
938 static void nfs_umount_begin(struct super_block *sb)
939 {
940 struct nfs_server *server;
941 struct rpc_clnt *rpc;
942
943 server = NFS_SB(sb);
944 /* -EIO all pending I/O */
945 rpc = server->client_acl;
946 if (!IS_ERR(rpc))
947 rpc_killall_tasks(rpc);
948 rpc = server->client;
949 if (!IS_ERR(rpc))
950 rpc_killall_tasks(rpc);
951 }
952
953 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
954 {
955 struct nfs_parsed_mount_data *data;
956
957 data = kzalloc(sizeof(*data), GFP_KERNEL);
958 if (data) {
959 data->acregmin = NFS_DEF_ACREGMIN;
960 data->acregmax = NFS_DEF_ACREGMAX;
961 data->acdirmin = NFS_DEF_ACDIRMIN;
962 data->acdirmax = NFS_DEF_ACDIRMAX;
963 data->mount_server.port = NFS_UNSPEC_PORT;
964 data->nfs_server.port = NFS_UNSPEC_PORT;
965 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
966 data->auth_flavors[0] = RPC_AUTH_UNIX;
967 data->auth_flavor_len = 1;
968 data->minorversion = 0;
969 data->need_mount = true;
970 data->net = current->nsproxy->net_ns;
971 security_init_mnt_opts(&data->lsm_opts);
972 }
973 return data;
974 }
975
976 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
977 {
978 if (data) {
979 kfree(data->client_address);
980 kfree(data->mount_server.hostname);
981 kfree(data->nfs_server.export_path);
982 kfree(data->nfs_server.hostname);
983 kfree(data->fscache_uniq);
984 security_free_mnt_opts(&data->lsm_opts);
985 kfree(data);
986 }
987 }
988
989 /*
990 * Sanity-check a server address provided by the mount command.
991 *
992 * Address family must be initialized, and address must not be
993 * the ANY address for that family.
994 */
995 static int nfs_verify_server_address(struct sockaddr *addr)
996 {
997 switch (addr->sa_family) {
998 case AF_INET: {
999 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
1000 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
1001 }
1002 case AF_INET6: {
1003 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1004 return !ipv6_addr_any(sa);
1005 }
1006 }
1007
1008 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
1009 return 0;
1010 }
1011
1012 /*
1013 * Select between a default port value and a user-specified port value.
1014 * If a zero value is set, then autobind will be used.
1015 */
1016 static void nfs_set_port(struct sockaddr *sap, int *port,
1017 const unsigned short default_port)
1018 {
1019 if (*port == NFS_UNSPEC_PORT)
1020 *port = default_port;
1021
1022 rpc_set_port(sap, *port);
1023 }
1024
1025 /*
1026 * Sanity check the NFS transport protocol.
1027 *
1028 */
1029 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1030 {
1031 switch (mnt->nfs_server.protocol) {
1032 case XPRT_TRANSPORT_UDP:
1033 case XPRT_TRANSPORT_TCP:
1034 case XPRT_TRANSPORT_RDMA:
1035 break;
1036 default:
1037 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1038 }
1039 }
1040
1041 /*
1042 * For text based NFSv2/v3 mounts, the mount protocol transport default
1043 * settings should depend upon the specified NFS transport.
1044 */
1045 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1046 {
1047 nfs_validate_transport_protocol(mnt);
1048
1049 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1050 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1051 return;
1052 switch (mnt->nfs_server.protocol) {
1053 case XPRT_TRANSPORT_UDP:
1054 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1055 break;
1056 case XPRT_TRANSPORT_TCP:
1057 case XPRT_TRANSPORT_RDMA:
1058 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1059 }
1060 }
1061
1062 /*
1063 * Parse the value of the 'sec=' option.
1064 */
1065 static int nfs_parse_security_flavors(char *value,
1066 struct nfs_parsed_mount_data *mnt)
1067 {
1068 substring_t args[MAX_OPT_ARGS];
1069
1070 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1071
1072 switch (match_token(value, nfs_secflavor_tokens, args)) {
1073 case Opt_sec_none:
1074 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1075 break;
1076 case Opt_sec_sys:
1077 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1078 break;
1079 case Opt_sec_krb5:
1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1081 break;
1082 case Opt_sec_krb5i:
1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1084 break;
1085 case Opt_sec_krb5p:
1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1087 break;
1088 case Opt_sec_lkey:
1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1090 break;
1091 case Opt_sec_lkeyi:
1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1093 break;
1094 case Opt_sec_lkeyp:
1095 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1096 break;
1097 case Opt_sec_spkm:
1098 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1099 break;
1100 case Opt_sec_spkmi:
1101 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1102 break;
1103 case Opt_sec_spkmp:
1104 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1105 break;
1106 default:
1107 return 0;
1108 }
1109
1110 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1111 mnt->auth_flavor_len = 1;
1112 return 1;
1113 }
1114
1115 static int nfs_parse_version_string(char *string,
1116 struct nfs_parsed_mount_data *mnt,
1117 substring_t *args)
1118 {
1119 mnt->flags &= ~NFS_MOUNT_VER3;
1120 switch (match_token(string, nfs_vers_tokens, args)) {
1121 case Opt_vers_2:
1122 mnt->version = 2;
1123 break;
1124 case Opt_vers_3:
1125 mnt->flags |= NFS_MOUNT_VER3;
1126 mnt->version = 3;
1127 break;
1128 case Opt_vers_4:
1129 /* Backward compatibility option. In future,
1130 * the mount program should always supply
1131 * a NFSv4 minor version number.
1132 */
1133 mnt->version = 4;
1134 break;
1135 case Opt_vers_4_0:
1136 mnt->version = 4;
1137 mnt->minorversion = 0;
1138 break;
1139 case Opt_vers_4_1:
1140 mnt->version = 4;
1141 mnt->minorversion = 1;
1142 break;
1143 default:
1144 return 0;
1145 }
1146 return 1;
1147 }
1148
1149 static int nfs_get_option_str(substring_t args[], char **option)
1150 {
1151 kfree(*option);
1152 *option = match_strdup(args);
1153 return !option;
1154 }
1155
1156 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1157 {
1158 int rc;
1159 char *string;
1160
1161 string = match_strdup(args);
1162 if (string == NULL)
1163 return -ENOMEM;
1164 rc = strict_strtoul(string, 10, option);
1165 kfree(string);
1166
1167 return rc;
1168 }
1169
1170 /*
1171 * Error-check and convert a string of mount options from user space into
1172 * a data structure. The whole mount string is processed; bad options are
1173 * skipped as they are encountered. If there were no errors, return 1;
1174 * otherwise return 0 (zero).
1175 */
1176 static int nfs_parse_mount_options(char *raw,
1177 struct nfs_parsed_mount_data *mnt)
1178 {
1179 char *p, *string, *secdata;
1180 int rc, sloppy = 0, invalid_option = 0;
1181 unsigned short protofamily = AF_UNSPEC;
1182 unsigned short mountfamily = AF_UNSPEC;
1183
1184 if (!raw) {
1185 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1186 return 1;
1187 }
1188 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1189
1190 secdata = alloc_secdata();
1191 if (!secdata)
1192 goto out_nomem;
1193
1194 rc = security_sb_copy_data(raw, secdata);
1195 if (rc)
1196 goto out_security_failure;
1197
1198 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1199 if (rc)
1200 goto out_security_failure;
1201
1202 free_secdata(secdata);
1203
1204 while ((p = strsep(&raw, ",")) != NULL) {
1205 substring_t args[MAX_OPT_ARGS];
1206 unsigned long option;
1207 int token;
1208
1209 if (!*p)
1210 continue;
1211
1212 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1213
1214 token = match_token(p, nfs_mount_option_tokens, args);
1215 switch (token) {
1216
1217 /*
1218 * boolean options: foo/nofoo
1219 */
1220 case Opt_soft:
1221 mnt->flags |= NFS_MOUNT_SOFT;
1222 break;
1223 case Opt_hard:
1224 mnt->flags &= ~NFS_MOUNT_SOFT;
1225 break;
1226 case Opt_posix:
1227 mnt->flags |= NFS_MOUNT_POSIX;
1228 break;
1229 case Opt_noposix:
1230 mnt->flags &= ~NFS_MOUNT_POSIX;
1231 break;
1232 case Opt_cto:
1233 mnt->flags &= ~NFS_MOUNT_NOCTO;
1234 break;
1235 case Opt_nocto:
1236 mnt->flags |= NFS_MOUNT_NOCTO;
1237 break;
1238 case Opt_ac:
1239 mnt->flags &= ~NFS_MOUNT_NOAC;
1240 break;
1241 case Opt_noac:
1242 mnt->flags |= NFS_MOUNT_NOAC;
1243 break;
1244 case Opt_lock:
1245 mnt->flags &= ~NFS_MOUNT_NONLM;
1246 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1247 NFS_MOUNT_LOCAL_FCNTL);
1248 break;
1249 case Opt_nolock:
1250 mnt->flags |= NFS_MOUNT_NONLM;
1251 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1252 NFS_MOUNT_LOCAL_FCNTL);
1253 break;
1254 case Opt_udp:
1255 mnt->flags &= ~NFS_MOUNT_TCP;
1256 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1257 break;
1258 case Opt_tcp:
1259 mnt->flags |= NFS_MOUNT_TCP;
1260 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1261 break;
1262 case Opt_rdma:
1263 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1264 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1265 xprt_load_transport(p);
1266 break;
1267 case Opt_acl:
1268 mnt->flags &= ~NFS_MOUNT_NOACL;
1269 break;
1270 case Opt_noacl:
1271 mnt->flags |= NFS_MOUNT_NOACL;
1272 break;
1273 case Opt_rdirplus:
1274 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1275 break;
1276 case Opt_nordirplus:
1277 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1278 break;
1279 case Opt_sharecache:
1280 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1281 break;
1282 case Opt_nosharecache:
1283 mnt->flags |= NFS_MOUNT_UNSHARED;
1284 break;
1285 case Opt_resvport:
1286 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1287 break;
1288 case Opt_noresvport:
1289 mnt->flags |= NFS_MOUNT_NORESVPORT;
1290 break;
1291 case Opt_fscache:
1292 mnt->options |= NFS_OPTION_FSCACHE;
1293 kfree(mnt->fscache_uniq);
1294 mnt->fscache_uniq = NULL;
1295 break;
1296 case Opt_nofscache:
1297 mnt->options &= ~NFS_OPTION_FSCACHE;
1298 kfree(mnt->fscache_uniq);
1299 mnt->fscache_uniq = NULL;
1300 break;
1301
1302 /*
1303 * options that take numeric values
1304 */
1305 case Opt_port:
1306 if (nfs_get_option_ul(args, &option) ||
1307 option > USHRT_MAX)
1308 goto out_invalid_value;
1309 mnt->nfs_server.port = option;
1310 break;
1311 case Opt_rsize:
1312 if (nfs_get_option_ul(args, &option))
1313 goto out_invalid_value;
1314 mnt->rsize = option;
1315 break;
1316 case Opt_wsize:
1317 if (nfs_get_option_ul(args, &option))
1318 goto out_invalid_value;
1319 mnt->wsize = option;
1320 break;
1321 case Opt_bsize:
1322 if (nfs_get_option_ul(args, &option))
1323 goto out_invalid_value;
1324 mnt->bsize = option;
1325 break;
1326 case Opt_timeo:
1327 if (nfs_get_option_ul(args, &option) || option == 0)
1328 goto out_invalid_value;
1329 mnt->timeo = option;
1330 break;
1331 case Opt_retrans:
1332 if (nfs_get_option_ul(args, &option) || option == 0)
1333 goto out_invalid_value;
1334 mnt->retrans = option;
1335 break;
1336 case Opt_acregmin:
1337 if (nfs_get_option_ul(args, &option))
1338 goto out_invalid_value;
1339 mnt->acregmin = option;
1340 break;
1341 case Opt_acregmax:
1342 if (nfs_get_option_ul(args, &option))
1343 goto out_invalid_value;
1344 mnt->acregmax = option;
1345 break;
1346 case Opt_acdirmin:
1347 if (nfs_get_option_ul(args, &option))
1348 goto out_invalid_value;
1349 mnt->acdirmin = option;
1350 break;
1351 case Opt_acdirmax:
1352 if (nfs_get_option_ul(args, &option))
1353 goto out_invalid_value;
1354 mnt->acdirmax = option;
1355 break;
1356 case Opt_actimeo:
1357 if (nfs_get_option_ul(args, &option))
1358 goto out_invalid_value;
1359 mnt->acregmin = mnt->acregmax =
1360 mnt->acdirmin = mnt->acdirmax = option;
1361 break;
1362 case Opt_namelen:
1363 if (nfs_get_option_ul(args, &option))
1364 goto out_invalid_value;
1365 mnt->namlen = option;
1366 break;
1367 case Opt_mountport:
1368 if (nfs_get_option_ul(args, &option) ||
1369 option > USHRT_MAX)
1370 goto out_invalid_value;
1371 mnt->mount_server.port = option;
1372 break;
1373 case Opt_mountvers:
1374 if (nfs_get_option_ul(args, &option) ||
1375 option < NFS_MNT_VERSION ||
1376 option > NFS_MNT3_VERSION)
1377 goto out_invalid_value;
1378 mnt->mount_server.version = option;
1379 break;
1380 case Opt_minorversion:
1381 if (nfs_get_option_ul(args, &option))
1382 goto out_invalid_value;
1383 if (option > NFS4_MAX_MINOR_VERSION)
1384 goto out_invalid_value;
1385 mnt->minorversion = option;
1386 break;
1387
1388 /*
1389 * options that take text values
1390 */
1391 case Opt_nfsvers:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
1395 rc = nfs_parse_version_string(string, mnt, args);
1396 kfree(string);
1397 if (!rc)
1398 goto out_invalid_value;
1399 break;
1400 case Opt_sec:
1401 string = match_strdup(args);
1402 if (string == NULL)
1403 goto out_nomem;
1404 rc = nfs_parse_security_flavors(string, mnt);
1405 kfree(string);
1406 if (!rc) {
1407 dfprintk(MOUNT, "NFS: unrecognized "
1408 "security flavor\n");
1409 return 0;
1410 }
1411 break;
1412 case Opt_proto:
1413 string = match_strdup(args);
1414 if (string == NULL)
1415 goto out_nomem;
1416 token = match_token(string,
1417 nfs_xprt_protocol_tokens, args);
1418
1419 protofamily = AF_INET;
1420 switch (token) {
1421 case Opt_xprt_udp6:
1422 protofamily = AF_INET6;
1423 case Opt_xprt_udp:
1424 mnt->flags &= ~NFS_MOUNT_TCP;
1425 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1426 break;
1427 case Opt_xprt_tcp6:
1428 protofamily = AF_INET6;
1429 case Opt_xprt_tcp:
1430 mnt->flags |= NFS_MOUNT_TCP;
1431 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1432 break;
1433 case Opt_xprt_rdma:
1434 /* vector side protocols to TCP */
1435 mnt->flags |= NFS_MOUNT_TCP;
1436 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1437 xprt_load_transport(string);
1438 break;
1439 default:
1440 dfprintk(MOUNT, "NFS: unrecognized "
1441 "transport protocol\n");
1442 kfree(string);
1443 return 0;
1444 }
1445 kfree(string);
1446 break;
1447 case Opt_mountproto:
1448 string = match_strdup(args);
1449 if (string == NULL)
1450 goto out_nomem;
1451 token = match_token(string,
1452 nfs_xprt_protocol_tokens, args);
1453 kfree(string);
1454
1455 mountfamily = AF_INET;
1456 switch (token) {
1457 case Opt_xprt_udp6:
1458 mountfamily = AF_INET6;
1459 case Opt_xprt_udp:
1460 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1461 break;
1462 case Opt_xprt_tcp6:
1463 mountfamily = AF_INET6;
1464 case Opt_xprt_tcp:
1465 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1466 break;
1467 case Opt_xprt_rdma: /* not used for side protocols */
1468 default:
1469 dfprintk(MOUNT, "NFS: unrecognized "
1470 "transport protocol\n");
1471 return 0;
1472 }
1473 break;
1474 case Opt_addr:
1475 string = match_strdup(args);
1476 if (string == NULL)
1477 goto out_nomem;
1478 mnt->nfs_server.addrlen =
1479 rpc_pton(mnt->net, string, strlen(string),
1480 (struct sockaddr *)
1481 &mnt->nfs_server.address,
1482 sizeof(mnt->nfs_server.address));
1483 kfree(string);
1484 if (mnt->nfs_server.addrlen == 0)
1485 goto out_invalid_address;
1486 break;
1487 case Opt_clientaddr:
1488 if (nfs_get_option_str(args, &mnt->client_address))
1489 goto out_nomem;
1490 break;
1491 case Opt_mounthost:
1492 if (nfs_get_option_str(args,
1493 &mnt->mount_server.hostname))
1494 goto out_nomem;
1495 break;
1496 case Opt_mountaddr:
1497 string = match_strdup(args);
1498 if (string == NULL)
1499 goto out_nomem;
1500 mnt->mount_server.addrlen =
1501 rpc_pton(mnt->net, string, strlen(string),
1502 (struct sockaddr *)
1503 &mnt->mount_server.address,
1504 sizeof(mnt->mount_server.address));
1505 kfree(string);
1506 if (mnt->mount_server.addrlen == 0)
1507 goto out_invalid_address;
1508 break;
1509 case Opt_lookupcache:
1510 string = match_strdup(args);
1511 if (string == NULL)
1512 goto out_nomem;
1513 token = match_token(string,
1514 nfs_lookupcache_tokens, args);
1515 kfree(string);
1516 switch (token) {
1517 case Opt_lookupcache_all:
1518 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1519 break;
1520 case Opt_lookupcache_positive:
1521 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1522 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1523 break;
1524 case Opt_lookupcache_none:
1525 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1526 break;
1527 default:
1528 dfprintk(MOUNT, "NFS: invalid "
1529 "lookupcache argument\n");
1530 return 0;
1531 };
1532 break;
1533 case Opt_fscache_uniq:
1534 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1535 goto out_nomem;
1536 mnt->options |= NFS_OPTION_FSCACHE;
1537 break;
1538 case Opt_local_lock:
1539 string = match_strdup(args);
1540 if (string == NULL)
1541 goto out_nomem;
1542 token = match_token(string, nfs_local_lock_tokens,
1543 args);
1544 kfree(string);
1545 switch (token) {
1546 case Opt_local_lock_all:
1547 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1548 NFS_MOUNT_LOCAL_FCNTL);
1549 break;
1550 case Opt_local_lock_flock:
1551 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1552 break;
1553 case Opt_local_lock_posix:
1554 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1555 break;
1556 case Opt_local_lock_none:
1557 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1558 NFS_MOUNT_LOCAL_FCNTL);
1559 break;
1560 default:
1561 dfprintk(MOUNT, "NFS: invalid "
1562 "local_lock argument\n");
1563 return 0;
1564 };
1565 break;
1566
1567 /*
1568 * Special options
1569 */
1570 case Opt_sloppy:
1571 sloppy = 1;
1572 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1573 break;
1574 case Opt_userspace:
1575 case Opt_deprecated:
1576 dfprintk(MOUNT, "NFS: ignoring mount option "
1577 "'%s'\n", p);
1578 break;
1579
1580 default:
1581 invalid_option = 1;
1582 dfprintk(MOUNT, "NFS: unrecognized mount option "
1583 "'%s'\n", p);
1584 }
1585 }
1586
1587 if (!sloppy && invalid_option)
1588 return 0;
1589
1590 if (mnt->minorversion && mnt->version != 4)
1591 goto out_minorversion_mismatch;
1592
1593 /*
1594 * verify that any proto=/mountproto= options match the address
1595 * familiies in the addr=/mountaddr= options.
1596 */
1597 if (protofamily != AF_UNSPEC &&
1598 protofamily != mnt->nfs_server.address.ss_family)
1599 goto out_proto_mismatch;
1600
1601 if (mountfamily != AF_UNSPEC) {
1602 if (mnt->mount_server.addrlen) {
1603 if (mountfamily != mnt->mount_server.address.ss_family)
1604 goto out_mountproto_mismatch;
1605 } else {
1606 if (mountfamily != mnt->nfs_server.address.ss_family)
1607 goto out_mountproto_mismatch;
1608 }
1609 }
1610
1611 return 1;
1612
1613 out_mountproto_mismatch:
1614 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1615 "option\n");
1616 return 0;
1617 out_proto_mismatch:
1618 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1619 return 0;
1620 out_invalid_address:
1621 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1622 return 0;
1623 out_invalid_value:
1624 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1625 return 0;
1626 out_minorversion_mismatch:
1627 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1628 "minorversion=%u\n", mnt->version, mnt->minorversion);
1629 return 0;
1630 out_nomem:
1631 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1632 return 0;
1633 out_security_failure:
1634 free_secdata(secdata);
1635 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1636 return 0;
1637 }
1638
1639 /*
1640 * Match the requested auth flavors with the list returned by
1641 * the server. Returns zero and sets the mount's authentication
1642 * flavor on success; returns -EACCES if server does not support
1643 * the requested flavor.
1644 */
1645 static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1646 struct nfs_mount_request *request)
1647 {
1648 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1649
1650 /*
1651 * Certain releases of Linux's mountd return an empty
1652 * flavor list. To prevent behavioral regression with
1653 * these servers (ie. rejecting mounts that used to
1654 * succeed), revert to pre-2.6.32 behavior (no checking)
1655 * if the returned flavor list is empty.
1656 */
1657 if (server_authlist_len == 0)
1658 return 0;
1659
1660 /*
1661 * We avoid sophisticated negotiating here, as there are
1662 * plenty of cases where we can get it wrong, providing
1663 * either too little or too much security.
1664 *
1665 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1666 * flavor listed first. However, some servers list
1667 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1668 * preferred default, in args->auth_flavors[0] if user
1669 * didn't specify sec= mount option.
1670 */
1671 for (i = 0; i < args->auth_flavor_len; i++)
1672 for (j = 0; j < server_authlist_len; j++)
1673 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1674 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1675 request->auth_flavs[j]);
1676 args->auth_flavors[0] = request->auth_flavs[j];
1677 return 0;
1678 }
1679
1680 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1681 nfs_umount(request);
1682 return -EACCES;
1683 }
1684
1685 /*
1686 * Use the remote server's MOUNT service to request the NFS file handle
1687 * corresponding to the provided path.
1688 */
1689 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1690 struct nfs_fh *root_fh)
1691 {
1692 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1693 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
1694 struct nfs_mount_request request = {
1695 .sap = (struct sockaddr *)
1696 &args->mount_server.address,
1697 .dirpath = args->nfs_server.export_path,
1698 .protocol = args->mount_server.protocol,
1699 .fh = root_fh,
1700 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1701 .auth_flav_len = &server_authlist_len,
1702 .auth_flavs = server_authlist,
1703 .net = args->net,
1704 };
1705 int status;
1706
1707 if (args->mount_server.version == 0) {
1708 switch (args->version) {
1709 default:
1710 args->mount_server.version = NFS_MNT3_VERSION;
1711 break;
1712 case 2:
1713 args->mount_server.version = NFS_MNT_VERSION;
1714 }
1715 }
1716 request.version = args->mount_server.version;
1717
1718 if (args->mount_server.hostname)
1719 request.hostname = args->mount_server.hostname;
1720 else
1721 request.hostname = args->nfs_server.hostname;
1722
1723 /*
1724 * Construct the mount server's address.
1725 */
1726 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1727 memcpy(request.sap, &args->nfs_server.address,
1728 args->nfs_server.addrlen);
1729 args->mount_server.addrlen = args->nfs_server.addrlen;
1730 }
1731 request.salen = args->mount_server.addrlen;
1732 nfs_set_port(request.sap, &args->mount_server.port, 0);
1733
1734 /*
1735 * Now ask the mount server to map our export path
1736 * to a file handle.
1737 */
1738 status = nfs_mount(&request);
1739 if (status != 0) {
1740 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1741 request.hostname, status);
1742 return status;
1743 }
1744
1745 /*
1746 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1747 */
1748 if (args->mount_server.version != NFS_MNT3_VERSION)
1749 return 0;
1750 return nfs_walk_authlist(args, &request);
1751 }
1752
1753 static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1754 struct nfs_fh *mntfh,
1755 struct nfs_mount_info *mount_info)
1756 {
1757 int status;
1758 struct nfs_server *server;
1759
1760 if (mount_info->parsed->need_mount) {
1761 status = nfs_request_mount(mount_info->parsed, mntfh);
1762 if (status)
1763 return ERR_PTR(status);
1764 }
1765
1766 /* Get a volume representation */
1767 server = nfs_create_server(mount_info->parsed, mntfh);
1768 if (IS_ERR(server))
1769 return ERR_CAST(server);
1770
1771 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mntfh, mount_info);
1772 }
1773
1774 /*
1775 * Split "dev_name" into "hostname:export_path".
1776 *
1777 * The leftmost colon demarks the split between the server's hostname
1778 * and the export path. If the hostname starts with a left square
1779 * bracket, then it may contain colons.
1780 *
1781 * Note: caller frees hostname and export path, even on error.
1782 */
1783 static int nfs_parse_devname(const char *dev_name,
1784 char **hostname, size_t maxnamlen,
1785 char **export_path, size_t maxpathlen)
1786 {
1787 size_t len;
1788 char *end;
1789
1790 /* Is the host name protected with square brakcets? */
1791 if (*dev_name == '[') {
1792 end = strchr(++dev_name, ']');
1793 if (end == NULL || end[1] != ':')
1794 goto out_bad_devname;
1795
1796 len = end - dev_name;
1797 end++;
1798 } else {
1799 char *comma;
1800
1801 end = strchr(dev_name, ':');
1802 if (end == NULL)
1803 goto out_bad_devname;
1804 len = end - dev_name;
1805
1806 /* kill possible hostname list: not supported */
1807 comma = strchr(dev_name, ',');
1808 if (comma != NULL && comma < end)
1809 *comma = 0;
1810 }
1811
1812 if (len > maxnamlen)
1813 goto out_hostname;
1814
1815 /* N.B. caller will free nfs_server.hostname in all cases */
1816 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1817 if (*hostname == NULL)
1818 goto out_nomem;
1819 len = strlen(++end);
1820 if (len > maxpathlen)
1821 goto out_path;
1822 *export_path = kstrndup(end, len, GFP_KERNEL);
1823 if (!*export_path)
1824 goto out_nomem;
1825
1826 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1827 return 0;
1828
1829 out_bad_devname:
1830 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1831 return -EINVAL;
1832
1833 out_nomem:
1834 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1835 return -ENOMEM;
1836
1837 out_hostname:
1838 dfprintk(MOUNT, "NFS: server hostname too long\n");
1839 return -ENAMETOOLONG;
1840
1841 out_path:
1842 dfprintk(MOUNT, "NFS: export pathname too long\n");
1843 return -ENAMETOOLONG;
1844 }
1845
1846 /*
1847 * Validate the NFS2/NFS3 mount data
1848 * - fills in the mount root filehandle
1849 *
1850 * For option strings, user space handles the following behaviors:
1851 *
1852 * + DNS: mapping server host name to IP address ("addr=" option)
1853 *
1854 * + failure mode: how to behave if a mount request can't be handled
1855 * immediately ("fg/bg" option)
1856 *
1857 * + retry: how often to retry a mount request ("retry=" option)
1858 *
1859 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1860 * mountproto=tcp after mountproto=udp, and so on
1861 */
1862 static int nfs23_validate_mount_data(void *options,
1863 struct nfs_parsed_mount_data *args,
1864 struct nfs_fh *mntfh,
1865 const char *dev_name)
1866 {
1867 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1868 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1869
1870 if (data == NULL)
1871 goto out_no_data;
1872
1873 switch (data->version) {
1874 case 1:
1875 data->namlen = 0;
1876 case 2:
1877 data->bsize = 0;
1878 case 3:
1879 if (data->flags & NFS_MOUNT_VER3)
1880 goto out_no_v3;
1881 data->root.size = NFS2_FHSIZE;
1882 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1883 case 4:
1884 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1885 goto out_no_sec;
1886 case 5:
1887 memset(data->context, 0, sizeof(data->context));
1888 case 6:
1889 if (data->flags & NFS_MOUNT_VER3) {
1890 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1891 goto out_invalid_fh;
1892 mntfh->size = data->root.size;
1893 args->version = 3;
1894 } else {
1895 mntfh->size = NFS2_FHSIZE;
1896 args->version = 2;
1897 }
1898
1899
1900 memcpy(mntfh->data, data->root.data, mntfh->size);
1901 if (mntfh->size < sizeof(mntfh->data))
1902 memset(mntfh->data + mntfh->size, 0,
1903 sizeof(mntfh->data) - mntfh->size);
1904
1905 /*
1906 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1907 * can deal with.
1908 */
1909 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1910 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
1911 args->rsize = data->rsize;
1912 args->wsize = data->wsize;
1913 args->timeo = data->timeo;
1914 args->retrans = data->retrans;
1915 args->acregmin = data->acregmin;
1916 args->acregmax = data->acregmax;
1917 args->acdirmin = data->acdirmin;
1918 args->acdirmax = data->acdirmax;
1919 args->need_mount = false;
1920
1921 memcpy(sap, &data->addr, sizeof(data->addr));
1922 args->nfs_server.addrlen = sizeof(data->addr);
1923 if (!nfs_verify_server_address(sap))
1924 goto out_no_address;
1925
1926 if (!(data->flags & NFS_MOUNT_TCP))
1927 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1928 /* N.B. caller will free nfs_server.hostname in all cases */
1929 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1930 args->namlen = data->namlen;
1931 args->bsize = data->bsize;
1932
1933 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1934 args->auth_flavors[0] = data->pseudoflavor;
1935 if (!args->nfs_server.hostname)
1936 goto out_nomem;
1937
1938 if (!(data->flags & NFS_MOUNT_NONLM))
1939 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1940 NFS_MOUNT_LOCAL_FCNTL);
1941 else
1942 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1943 NFS_MOUNT_LOCAL_FCNTL);
1944 /*
1945 * The legacy version 6 binary mount data from userspace has a
1946 * field used only to transport selinux information into the
1947 * the kernel. To continue to support that functionality we
1948 * have a touch of selinux knowledge here in the NFS code. The
1949 * userspace code converted context=blah to just blah so we are
1950 * converting back to the full string selinux understands.
1951 */
1952 if (data->context[0]){
1953 #ifdef CONFIG_SECURITY_SELINUX
1954 int rc;
1955 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1956 if (!opts_str)
1957 return -ENOMEM;
1958 strcpy(opts_str, "context=");
1959 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1960 strcat(opts_str, &data->context[0]);
1961 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1962 kfree(opts_str);
1963 if (rc)
1964 return rc;
1965 #else
1966 return -EINVAL;
1967 #endif
1968 }
1969
1970 break;
1971 default:
1972 return NFS_TEXT_DATA;
1973 }
1974
1975 #ifndef CONFIG_NFS_V3
1976 if (args->version == 3)
1977 goto out_v3_not_compiled;
1978 #endif /* !CONFIG_NFS_V3 */
1979
1980 return 0;
1981
1982 out_no_data:
1983 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1984 return -EINVAL;
1985
1986 out_no_v3:
1987 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1988 data->version);
1989 return -EINVAL;
1990
1991 out_no_sec:
1992 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1993 return -EINVAL;
1994
1995 #ifndef CONFIG_NFS_V3
1996 out_v3_not_compiled:
1997 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1998 return -EPROTONOSUPPORT;
1999 #endif /* !CONFIG_NFS_V3 */
2000
2001 out_nomem:
2002 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2003 return -ENOMEM;
2004
2005 out_no_address:
2006 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2007 return -EINVAL;
2008
2009 out_invalid_fh:
2010 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2011 return -EINVAL;
2012 }
2013
2014 #ifdef CONFIG_NFS_V4
2015 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2016 void *options,
2017 struct nfs_parsed_mount_data *args,
2018 struct nfs_fh *mntfh,
2019 const char *dev_name)
2020 {
2021 if (fs_type == &nfs_fs_type)
2022 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2023 return nfs4_validate_mount_data(options, args, dev_name);
2024 }
2025 #else
2026 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2027 void *options,
2028 struct nfs_parsed_mount_data *args,
2029 struct nfs_fh *mntfh,
2030 const char *dev_name)
2031 {
2032 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2033 }
2034 #endif
2035
2036 static int nfs_validate_text_mount_data(void *options,
2037 struct nfs_parsed_mount_data *args,
2038 const char *dev_name)
2039 {
2040 int port = 0;
2041 int max_namelen = PAGE_SIZE;
2042 int max_pathlen = NFS_MAXPATHLEN;
2043 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2044
2045 if (nfs_parse_mount_options((char *)options, args) == 0)
2046 return -EINVAL;
2047
2048 if (!nfs_verify_server_address(sap))
2049 goto out_no_address;
2050
2051 if (args->version == 4) {
2052 #ifdef CONFIG_NFS_V4
2053 port = NFS_PORT;
2054 max_namelen = NFS4_MAXNAMLEN;
2055 max_pathlen = NFS4_MAXPATHLEN;
2056 nfs_validate_transport_protocol(args);
2057 nfs4_validate_mount_flags(args);
2058 #else
2059 goto out_v4_not_compiled;
2060 #endif /* CONFIG_NFS_V4 */
2061 } else
2062 nfs_set_mount_transport_protocol(args);
2063
2064 nfs_set_port(sap, &args->nfs_server.port, port);
2065
2066 if (args->auth_flavor_len > 1)
2067 goto out_bad_auth;
2068
2069 return nfs_parse_devname(dev_name,
2070 &args->nfs_server.hostname,
2071 max_namelen,
2072 &args->nfs_server.export_path,
2073 max_pathlen);
2074
2075 #ifndef CONFIG_NFS_V4
2076 out_v4_not_compiled:
2077 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2078 return -EPROTONOSUPPORT;
2079 #endif /* !CONFIG_NFS_V4 */
2080
2081 out_no_address:
2082 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2083 return -EINVAL;
2084
2085 out_bad_auth:
2086 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2087 return -EINVAL;
2088 }
2089
2090 static int
2091 nfs_compare_remount_data(struct nfs_server *nfss,
2092 struct nfs_parsed_mount_data *data)
2093 {
2094 if (data->flags != nfss->flags ||
2095 data->rsize != nfss->rsize ||
2096 data->wsize != nfss->wsize ||
2097 data->retrans != nfss->client->cl_timeout->to_retries ||
2098 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2099 data->acregmin != nfss->acregmin / HZ ||
2100 data->acregmax != nfss->acregmax / HZ ||
2101 data->acdirmin != nfss->acdirmin / HZ ||
2102 data->acdirmax != nfss->acdirmax / HZ ||
2103 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2104 data->nfs_server.port != nfss->port ||
2105 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2106 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2107 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2108 return -EINVAL;
2109
2110 return 0;
2111 }
2112
2113 static int
2114 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2115 {
2116 int error;
2117 struct nfs_server *nfss = sb->s_fs_info;
2118 struct nfs_parsed_mount_data *data;
2119 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2120 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2121 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2122
2123 /*
2124 * Userspace mount programs that send binary options generally send
2125 * them populated with default values. We have no way to know which
2126 * ones were explicitly specified. Fall back to legacy behavior and
2127 * just return success.
2128 */
2129 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2130 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2131 options->version <= 6))))
2132 return 0;
2133
2134 data = kzalloc(sizeof(*data), GFP_KERNEL);
2135 if (data == NULL)
2136 return -ENOMEM;
2137
2138 /* fill out struct with values from existing mount */
2139 data->flags = nfss->flags;
2140 data->rsize = nfss->rsize;
2141 data->wsize = nfss->wsize;
2142 data->retrans = nfss->client->cl_timeout->to_retries;
2143 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2144 data->acregmin = nfss->acregmin / HZ;
2145 data->acregmax = nfss->acregmax / HZ;
2146 data->acdirmin = nfss->acdirmin / HZ;
2147 data->acdirmax = nfss->acdirmax / HZ;
2148 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2149 data->nfs_server.port = nfss->port;
2150 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2151 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2152 data->nfs_server.addrlen);
2153
2154 /* overwrite those values with any that were specified */
2155 error = nfs_parse_mount_options((char *)options, data);
2156 if (error < 0)
2157 goto out;
2158
2159 /*
2160 * noac is a special case. It implies -o sync, but that's not
2161 * necessarily reflected in the mtab options. do_remount_sb
2162 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2163 * remount options, so we have to explicitly reset it.
2164 */
2165 if (data->flags & NFS_MOUNT_NOAC)
2166 *flags |= MS_SYNCHRONOUS;
2167
2168 /* compare new mount options with old ones */
2169 error = nfs_compare_remount_data(nfss, data);
2170 out:
2171 kfree(data);
2172 return error;
2173 }
2174
2175 /*
2176 * Initialise the common bits of the superblock
2177 */
2178 static inline void nfs_initialise_sb(struct super_block *sb)
2179 {
2180 struct nfs_server *server = NFS_SB(sb);
2181
2182 sb->s_magic = NFS_SUPER_MAGIC;
2183
2184 /* We probably want something more informative here */
2185 snprintf(sb->s_id, sizeof(sb->s_id),
2186 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2187
2188 if (sb->s_blocksize == 0)
2189 sb->s_blocksize = nfs_block_bits(server->wsize,
2190 &sb->s_blocksize_bits);
2191
2192 sb->s_bdi = &server->backing_dev_info;
2193
2194 nfs_super_set_maxbytes(sb, server->maxfilesize);
2195 }
2196
2197 /*
2198 * Finish setting up an NFS2/3 superblock
2199 */
2200 static void nfs_fill_super(struct super_block *sb,
2201 struct nfs_mount_info *mount_info)
2202 {
2203 struct nfs_parsed_mount_data *data = mount_info->parsed;
2204 struct nfs_server *server = NFS_SB(sb);
2205
2206 sb->s_blocksize_bits = 0;
2207 sb->s_blocksize = 0;
2208 if (data->bsize)
2209 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2210
2211 if (server->nfs_client->rpc_ops->version == 3) {
2212 /* The VFS shouldn't apply the umask to mode bits. We will do
2213 * so ourselves when necessary.
2214 */
2215 sb->s_flags |= MS_POSIXACL;
2216 sb->s_time_gran = 1;
2217 }
2218
2219 sb->s_op = &nfs_sops;
2220 nfs_initialise_sb(sb);
2221 }
2222
2223 /*
2224 * Finish setting up a cloned NFS2/3 superblock
2225 */
2226 static void nfs_clone_super(struct super_block *sb,
2227 struct nfs_mount_info *mount_info)
2228 {
2229 const struct super_block *old_sb = mount_info->cloned->sb;
2230 struct nfs_server *server = NFS_SB(sb);
2231
2232 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2233 sb->s_blocksize = old_sb->s_blocksize;
2234 sb->s_maxbytes = old_sb->s_maxbytes;
2235
2236 if (server->nfs_client->rpc_ops->version == 3) {
2237 /* The VFS shouldn't apply the umask to mode bits. We will do
2238 * so ourselves when necessary.
2239 */
2240 sb->s_flags |= MS_POSIXACL;
2241 sb->s_time_gran = 1;
2242 }
2243
2244 sb->s_op = old_sb->s_op;
2245 nfs_initialise_sb(sb);
2246 }
2247
2248 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2249 {
2250 const struct nfs_server *a = s->s_fs_info;
2251 const struct rpc_clnt *clnt_a = a->client;
2252 const struct rpc_clnt *clnt_b = b->client;
2253
2254 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2255 goto Ebusy;
2256 if (a->nfs_client != b->nfs_client)
2257 goto Ebusy;
2258 if (a->flags != b->flags)
2259 goto Ebusy;
2260 if (a->wsize != b->wsize)
2261 goto Ebusy;
2262 if (a->rsize != b->rsize)
2263 goto Ebusy;
2264 if (a->acregmin != b->acregmin)
2265 goto Ebusy;
2266 if (a->acregmax != b->acregmax)
2267 goto Ebusy;
2268 if (a->acdirmin != b->acdirmin)
2269 goto Ebusy;
2270 if (a->acdirmax != b->acdirmax)
2271 goto Ebusy;
2272 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2273 goto Ebusy;
2274 return 1;
2275 Ebusy:
2276 return 0;
2277 }
2278
2279 struct nfs_sb_mountdata {
2280 struct nfs_server *server;
2281 int mntflags;
2282 };
2283
2284 static int nfs_set_super(struct super_block *s, void *data)
2285 {
2286 struct nfs_sb_mountdata *sb_mntdata = data;
2287 struct nfs_server *server = sb_mntdata->server;
2288 int ret;
2289
2290 s->s_flags = sb_mntdata->mntflags;
2291 s->s_fs_info = server;
2292 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2293 ret = set_anon_super(s, server);
2294 if (ret == 0)
2295 server->s_dev = s->s_dev;
2296 return ret;
2297 }
2298
2299 static int nfs_compare_super_address(struct nfs_server *server1,
2300 struct nfs_server *server2)
2301 {
2302 struct sockaddr *sap1, *sap2;
2303
2304 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2305 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2306
2307 if (sap1->sa_family != sap2->sa_family)
2308 return 0;
2309
2310 switch (sap1->sa_family) {
2311 case AF_INET: {
2312 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2313 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2314 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2315 return 0;
2316 if (sin1->sin_port != sin2->sin_port)
2317 return 0;
2318 break;
2319 }
2320 case AF_INET6: {
2321 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2322 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2323 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2324 return 0;
2325 if (sin1->sin6_port != sin2->sin6_port)
2326 return 0;
2327 break;
2328 }
2329 default:
2330 return 0;
2331 }
2332
2333 return 1;
2334 }
2335
2336 static int nfs_compare_super(struct super_block *sb, void *data)
2337 {
2338 struct nfs_sb_mountdata *sb_mntdata = data;
2339 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2340 int mntflags = sb_mntdata->mntflags;
2341
2342 if (!nfs_compare_super_address(old, server))
2343 return 0;
2344 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2345 if (old->flags & NFS_MOUNT_UNSHARED)
2346 return 0;
2347 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2348 return 0;
2349 return nfs_compare_mount_options(sb, server, mntflags);
2350 }
2351
2352 static void nfs_get_cache_cookie(struct super_block *sb,
2353 struct nfs_parsed_mount_data *parsed,
2354 struct nfs_clone_mount *cloned)
2355 {
2356 char *uniq = NULL;
2357 int ulen = 0;
2358
2359 if (parsed && parsed->fscache_uniq) {
2360 uniq = parsed->fscache_uniq;
2361 ulen = strlen(parsed->fscache_uniq);
2362 } else if (cloned) {
2363 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2364 if (mnt_s->fscache_key) {
2365 uniq = mnt_s->fscache_key->key.uniquifier;
2366 ulen = mnt_s->fscache_key->key.uniq_len;
2367 };
2368 }
2369
2370 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2371 }
2372
2373 static int nfs_bdi_register(struct nfs_server *server)
2374 {
2375 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2376 }
2377
2378 static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2379 struct nfs_mount_info *mount_info)
2380 {
2381 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2382 }
2383
2384 static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2385 struct nfs_mount_info *mount_info)
2386 {
2387 /* clone any lsm security options from the parent to the new sb */
2388 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2389 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2390 return -ESTALE;
2391 return 0;
2392 }
2393
2394 static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2395 struct nfs_server *server,
2396 int flags, const char *dev_name,
2397 struct nfs_fh *mntfh,
2398 struct nfs_mount_info *mount_info)
2399 {
2400 struct super_block *s;
2401 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2402 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2403 struct nfs_sb_mountdata sb_mntdata = {
2404 .mntflags = flags,
2405 .server = server,
2406 };
2407 int error;
2408
2409 if (server->flags & NFS_MOUNT_UNSHARED)
2410 compare_super = NULL;
2411
2412 /* -o noac implies -o sync */
2413 if (server->flags & NFS_MOUNT_NOAC)
2414 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2415
2416 /* Get a superblock - note that we may end up sharing one that already exists */
2417 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2418 if (IS_ERR(s)) {
2419 mntroot = ERR_CAST(s);
2420 goto out_err_nosb;
2421 }
2422
2423 if (s->s_fs_info != server) {
2424 nfs_free_server(server);
2425 server = NULL;
2426 } else {
2427 error = nfs_bdi_register(server);
2428 if (error) {
2429 mntroot = ERR_PTR(error);
2430 goto error_splat_bdi;
2431 }
2432 }
2433
2434 if (!s->s_root) {
2435 /* initial superblock/root creation */
2436 mount_info->fill_super(s, mount_info);
2437 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2438 }
2439
2440 mntroot = nfs_get_root(s, mntfh, dev_name);
2441 if (IS_ERR(mntroot))
2442 goto error_splat_super;
2443
2444 error = mount_info->set_security(s, mntroot, mount_info);
2445 if (error)
2446 goto error_splat_root;
2447
2448 s->s_flags |= MS_ACTIVE;
2449
2450 out:
2451 return mntroot;
2452
2453 out_err_nosb:
2454 nfs_free_server(server);
2455 goto out;
2456
2457 error_splat_root:
2458 dput(mntroot);
2459 mntroot = ERR_PTR(error);
2460 error_splat_super:
2461 if (server && !s->s_root)
2462 bdi_unregister(&server->backing_dev_info);
2463 error_splat_bdi:
2464 deactivate_locked_super(s);
2465 goto out;
2466 }
2467
2468 static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2469 int flags, const char *dev_name, void *raw_data)
2470 {
2471 struct nfs_mount_info mount_info = {
2472 .fill_super = nfs_fill_super,
2473 .set_security = nfs_set_sb_security,
2474 };
2475 struct nfs_fh *mntfh;
2476 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2477 int error;
2478
2479 mount_info.parsed = nfs_alloc_parsed_mount_data();
2480 mntfh = nfs_alloc_fhandle();
2481 if (mount_info.parsed == NULL || mntfh == NULL)
2482 goto out;
2483
2484 /* Validate the mount data */
2485 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mntfh, dev_name);
2486 if (error == NFS_TEXT_DATA)
2487 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2488 if (error < 0) {
2489 mntroot = ERR_PTR(error);
2490 goto out;
2491 }
2492
2493 #ifdef CONFIG_NFS_V4
2494 if (mount_info.parsed->version == 4)
2495 mntroot = nfs4_try_mount(flags, dev_name, mount_info.parsed);
2496 else
2497 #endif /* CONFIG_NFS_V4 */
2498 mntroot = nfs_try_mount(flags, dev_name, mntfh, &mount_info);
2499
2500 out:
2501 nfs_free_parsed_mount_data(mount_info.parsed);
2502 nfs_free_fhandle(mntfh);
2503 return mntroot;
2504 }
2505
2506 /*
2507 * Ensure that we unregister the bdi before kill_anon_super
2508 * releases the device name
2509 */
2510 static void nfs_put_super(struct super_block *s)
2511 {
2512 struct nfs_server *server = NFS_SB(s);
2513
2514 bdi_unregister(&server->backing_dev_info);
2515 }
2516
2517 /*
2518 * Destroy an NFS2/3 superblock
2519 */
2520 static void nfs_kill_super(struct super_block *s)
2521 {
2522 struct nfs_server *server = NFS_SB(s);
2523
2524 kill_anon_super(s);
2525 nfs_fscache_release_super_cookie(s);
2526 nfs_free_server(server);
2527 }
2528
2529 /*
2530 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2531 */
2532 static struct dentry *
2533 nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2534 const char *dev_name, struct nfs_mount_info *mount_info)
2535 {
2536 struct nfs_clone_mount *data = mount_info->cloned;
2537 struct nfs_server *server;
2538 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2539 int error;
2540
2541 dprintk("--> nfs_xdev_mount_common()\n");
2542
2543 /* create a new volume representation */
2544 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2545 if (IS_ERR(server)) {
2546 error = PTR_ERR(server);
2547 goto out_err;
2548 }
2549
2550 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, data->fh, mount_info);
2551 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2552 out:
2553 return mntroot;
2554
2555 out_err:
2556 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
2557 goto out;
2558 }
2559
2560 /*
2561 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2562 */
2563 static struct dentry *
2564 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2565 const char *dev_name, void *raw_data)
2566 {
2567 struct nfs_mount_info mount_info = {
2568 .fill_super = nfs_clone_super,
2569 .set_security = nfs_clone_sb_security,
2570 .cloned = raw_data,
2571 };
2572 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2573 }
2574
2575 #ifdef CONFIG_NFS_V4
2576
2577 /*
2578 * Finish setting up a cloned NFS4 superblock
2579 */
2580 static void nfs4_clone_super(struct super_block *sb,
2581 struct nfs_mount_info *mount_info)
2582 {
2583 const struct super_block *old_sb = mount_info->cloned->sb;
2584 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2585 sb->s_blocksize = old_sb->s_blocksize;
2586 sb->s_maxbytes = old_sb->s_maxbytes;
2587 sb->s_time_gran = 1;
2588 sb->s_op = old_sb->s_op;
2589 /*
2590 * The VFS shouldn't apply the umask to mode bits. We will do
2591 * so ourselves when necessary.
2592 */
2593 sb->s_flags |= MS_POSIXACL;
2594 sb->s_xattr = old_sb->s_xattr;
2595 nfs_initialise_sb(sb);
2596 }
2597
2598 /*
2599 * Set up an NFS4 superblock
2600 */
2601 static void nfs4_fill_super(struct super_block *sb,
2602 struct nfs_mount_info *mount_info)
2603 {
2604 sb->s_time_gran = 1;
2605 sb->s_op = &nfs4_sops;
2606 /*
2607 * The VFS shouldn't apply the umask to mode bits. We will do
2608 * so ourselves when necessary.
2609 */
2610 sb->s_flags |= MS_POSIXACL;
2611 sb->s_xattr = nfs4_xattr_handlers;
2612 nfs_initialise_sb(sb);
2613 }
2614
2615 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2616 {
2617 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2618 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2619 }
2620
2621 /*
2622 * Validate NFSv4 mount options
2623 */
2624 static int nfs4_validate_mount_data(void *options,
2625 struct nfs_parsed_mount_data *args,
2626 const char *dev_name)
2627 {
2628 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2629 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2630 char *c;
2631
2632 if (data == NULL)
2633 goto out_no_data;
2634
2635 switch (data->version) {
2636 case 1:
2637 if (data->host_addrlen > sizeof(args->nfs_server.address))
2638 goto out_no_address;
2639 if (data->host_addrlen == 0)
2640 goto out_no_address;
2641 args->nfs_server.addrlen = data->host_addrlen;
2642 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2643 return -EFAULT;
2644 if (!nfs_verify_server_address(sap))
2645 goto out_no_address;
2646
2647 if (data->auth_flavourlen) {
2648 if (data->auth_flavourlen > 1)
2649 goto out_inval_auth;
2650 if (copy_from_user(&args->auth_flavors[0],
2651 data->auth_flavours,
2652 sizeof(args->auth_flavors[0])))
2653 return -EFAULT;
2654 }
2655
2656 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2657 if (IS_ERR(c))
2658 return PTR_ERR(c);
2659 args->nfs_server.hostname = c;
2660
2661 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
2664 args->nfs_server.export_path = c;
2665 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2666
2667 c = strndup_user(data->client_addr.data, 16);
2668 if (IS_ERR(c))
2669 return PTR_ERR(c);
2670 args->client_address = c;
2671
2672 /*
2673 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2674 * can deal with.
2675 */
2676
2677 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2678 args->rsize = data->rsize;
2679 args->wsize = data->wsize;
2680 args->timeo = data->timeo;
2681 args->retrans = data->retrans;
2682 args->acregmin = data->acregmin;
2683 args->acregmax = data->acregmax;
2684 args->acdirmin = data->acdirmin;
2685 args->acdirmax = data->acdirmax;
2686 args->nfs_server.protocol = data->proto;
2687 nfs_validate_transport_protocol(args);
2688
2689 break;
2690 default:
2691 return NFS_TEXT_DATA;
2692 }
2693
2694 return 0;
2695
2696 out_no_data:
2697 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2698 return -EINVAL;
2699
2700 out_inval_auth:
2701 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2702 data->auth_flavourlen);
2703 return -EINVAL;
2704
2705 out_no_address:
2706 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2707 return -EINVAL;
2708 }
2709
2710 /*
2711 * Get the superblock for the NFS4 root partition
2712 */
2713 static struct dentry *
2714 nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2715 const char *dev_name, void *raw_data)
2716 {
2717 struct nfs_mount_info mount_info = {
2718 .fill_super = nfs4_fill_super,
2719 .set_security = nfs_set_sb_security,
2720 .parsed = raw_data,
2721 };
2722 struct nfs_server *server;
2723 struct nfs_fh *mntfh;
2724 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2725
2726 mntfh = nfs_alloc_fhandle();
2727 if (mount_info.parsed == NULL || mntfh == NULL)
2728 goto out;
2729
2730 /* Get a volume representation */
2731 server = nfs4_create_server(mount_info.parsed, mntfh);
2732 if (IS_ERR(server)) {
2733 mntroot = ERR_CAST(server);
2734 goto out;
2735 }
2736
2737 mntroot = nfs_fs_mount_common(fs_type, server, flags,
2738 dev_name, mntfh, &mount_info);
2739
2740 out:
2741 nfs_free_fhandle(mntfh);
2742 return mntroot;
2743 }
2744
2745 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2746 int flags, void *data, const char *hostname)
2747 {
2748 struct vfsmount *root_mnt;
2749 char *root_devname;
2750 size_t len;
2751
2752 len = strlen(hostname) + 5;
2753 root_devname = kmalloc(len, GFP_KERNEL);
2754 if (root_devname == NULL)
2755 return ERR_PTR(-ENOMEM);
2756 /* Does hostname needs to be enclosed in brackets? */
2757 if (strchr(hostname, ':'))
2758 snprintf(root_devname, len, "[%s]:/", hostname);
2759 else
2760 snprintf(root_devname, len, "%s:/", hostname);
2761 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2762 kfree(root_devname);
2763 return root_mnt;
2764 }
2765
2766 struct nfs_referral_count {
2767 struct list_head list;
2768 const struct task_struct *task;
2769 unsigned int referral_count;
2770 };
2771
2772 static LIST_HEAD(nfs_referral_count_list);
2773 static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2774
2775 static struct nfs_referral_count *nfs_find_referral_count(void)
2776 {
2777 struct nfs_referral_count *p;
2778
2779 list_for_each_entry(p, &nfs_referral_count_list, list) {
2780 if (p->task == current)
2781 return p;
2782 }
2783 return NULL;
2784 }
2785
2786 #define NFS_MAX_NESTED_REFERRALS 2
2787
2788 static int nfs_referral_loop_protect(void)
2789 {
2790 struct nfs_referral_count *p, *new;
2791 int ret = -ENOMEM;
2792
2793 new = kmalloc(sizeof(*new), GFP_KERNEL);
2794 if (!new)
2795 goto out;
2796 new->task = current;
2797 new->referral_count = 1;
2798
2799 ret = 0;
2800 spin_lock(&nfs_referral_count_list_lock);
2801 p = nfs_find_referral_count();
2802 if (p != NULL) {
2803 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2804 ret = -ELOOP;
2805 else
2806 p->referral_count++;
2807 } else {
2808 list_add(&new->list, &nfs_referral_count_list);
2809 new = NULL;
2810 }
2811 spin_unlock(&nfs_referral_count_list_lock);
2812 kfree(new);
2813 out:
2814 return ret;
2815 }
2816
2817 static void nfs_referral_loop_unprotect(void)
2818 {
2819 struct nfs_referral_count *p;
2820
2821 spin_lock(&nfs_referral_count_list_lock);
2822 p = nfs_find_referral_count();
2823 p->referral_count--;
2824 if (p->referral_count == 0)
2825 list_del(&p->list);
2826 else
2827 p = NULL;
2828 spin_unlock(&nfs_referral_count_list_lock);
2829 kfree(p);
2830 }
2831
2832 static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2833 const char *export_path)
2834 {
2835 struct dentry *dentry;
2836 int err;
2837
2838 if (IS_ERR(root_mnt))
2839 return ERR_CAST(root_mnt);
2840
2841 err = nfs_referral_loop_protect();
2842 if (err) {
2843 mntput(root_mnt);
2844 return ERR_PTR(err);
2845 }
2846
2847 dentry = mount_subtree(root_mnt, export_path);
2848 nfs_referral_loop_unprotect();
2849
2850 return dentry;
2851 }
2852
2853 static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2854 struct nfs_parsed_mount_data *data)
2855 {
2856 char *export_path;
2857 struct vfsmount *root_mnt;
2858 struct dentry *res;
2859
2860 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2861
2862 export_path = data->nfs_server.export_path;
2863 data->nfs_server.export_path = "/";
2864 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2865 data->nfs_server.hostname);
2866 data->nfs_server.export_path = export_path;
2867
2868 res = nfs_follow_remote_path(root_mnt, export_path);
2869
2870 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2871 IS_ERR(res) ? PTR_ERR(res) : 0,
2872 IS_ERR(res) ? " [error]" : "");
2873 return res;
2874 }
2875
2876 /*
2877 * Get the superblock for an NFS4 mountpoint
2878 */
2879 static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2880 int flags, const char *dev_name, void *raw_data)
2881 {
2882 struct nfs_parsed_mount_data *data;
2883 int error = -ENOMEM;
2884 struct dentry *res = ERR_PTR(-ENOMEM);
2885
2886 data = nfs_alloc_parsed_mount_data();
2887 if (data == NULL)
2888 goto out;
2889
2890 /* Validate the mount data */
2891 error = nfs_validate_mount_data(fs_type, raw_data, data, NULL, dev_name);
2892 if (error == NFS_TEXT_DATA)
2893 error = nfs_validate_text_mount_data(raw_data, data, dev_name);
2894 if (error < 0) {
2895 res = ERR_PTR(error);
2896 goto out;
2897 }
2898
2899 res = nfs4_try_mount(flags, dev_name, data);
2900 if (IS_ERR(res))
2901 error = PTR_ERR(res);
2902
2903 out:
2904 nfs_free_parsed_mount_data(data);
2905 dprintk("<-- nfs4_mount() = %d%s\n", error,
2906 error != 0 ? " [error]" : "");
2907 return res;
2908 }
2909
2910 static void nfs4_kill_super(struct super_block *sb)
2911 {
2912 struct nfs_server *server = NFS_SB(sb);
2913
2914 dprintk("--> %s\n", __func__);
2915 nfs_super_return_all_delegations(sb);
2916 kill_anon_super(sb);
2917 nfs_fscache_release_super_cookie(sb);
2918 nfs_free_server(server);
2919 dprintk("<-- %s\n", __func__);
2920 }
2921
2922 /*
2923 * Clone an NFS4 server record on xdev traversal (FSID-change)
2924 */
2925 static struct dentry *
2926 nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2927 const char *dev_name, void *raw_data)
2928 {
2929 struct nfs_mount_info mount_info = {
2930 .fill_super = nfs4_clone_super,
2931 .set_security = nfs_clone_sb_security,
2932 .cloned = raw_data,
2933 };
2934 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
2935 }
2936
2937 static struct dentry *
2938 nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2939 const char *dev_name, void *raw_data)
2940 {
2941 struct nfs_mount_info mount_info = {
2942 .fill_super = nfs4_fill_super,
2943 .set_security = nfs_clone_sb_security,
2944 .cloned = raw_data,
2945 };
2946 struct nfs_server *server;
2947 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2948 struct nfs_fh *mntfh;
2949
2950 dprintk("--> nfs4_referral_get_sb()\n");
2951
2952 mntfh = nfs_alloc_fhandle();
2953 if (mount_info.cloned == NULL || mntfh == NULL)
2954 goto out;
2955
2956 /* create a new volume representation */
2957 server = nfs4_create_referral_server(mount_info.cloned, mntfh);
2958 if (IS_ERR(server)) {
2959 mntroot = ERR_CAST(server);
2960 goto out;
2961 }
2962
2963 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, mntfh, &mount_info);
2964 out:
2965 nfs_free_fhandle(mntfh);
2966 return mntroot;
2967 }
2968
2969 /*
2970 * Create an NFS4 server record on referral traversal
2971 */
2972 static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2973 int flags, const char *dev_name, void *raw_data)
2974 {
2975 struct nfs_clone_mount *data = raw_data;
2976 char *export_path;
2977 struct vfsmount *root_mnt;
2978 struct dentry *res;
2979
2980 dprintk("--> nfs4_referral_mount()\n");
2981
2982 export_path = data->mnt_path;
2983 data->mnt_path = "/";
2984
2985 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2986 flags, data, data->hostname);
2987 data->mnt_path = export_path;
2988
2989 res = nfs_follow_remote_path(root_mnt, export_path);
2990 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2991 IS_ERR(res) ? PTR_ERR(res) : 0,
2992 IS_ERR(res) ? " [error]" : "");
2993 return res;
2994 }
2995
2996 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
This page took 0.090757 seconds and 5 git commands to generate.