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powerpc: Shield code specific to 64-bit server processors
[deliverable/linux.git] / fs / nfs / super.c
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <net/ipv6.h>
50 #include <linux/netdevice.h>
51 #include <linux/nfs_xdr.h>
52 #include <linux/magic.h>
53 #include <linux/parser.h>
54
55 #include <asm/system.h>
56 #include <asm/uaccess.h>
57
58 #include "nfs4_fs.h"
59 #include "callback.h"
60 #include "delegation.h"
61 #include "iostat.h"
62 #include "internal.h"
63 #include "fscache.h"
64
65 #define NFSDBG_FACILITY NFSDBG_VFS
66
67 enum {
68 /* Mount options that take no arguments */
69 Opt_soft, Opt_hard,
70 Opt_posix, Opt_noposix,
71 Opt_cto, Opt_nocto,
72 Opt_ac, Opt_noac,
73 Opt_lock, Opt_nolock,
74 Opt_v2, Opt_v3,
75 Opt_udp, Opt_tcp, Opt_rdma,
76 Opt_acl, Opt_noacl,
77 Opt_rdirplus, Opt_nordirplus,
78 Opt_sharecache, Opt_nosharecache,
79 Opt_resvport, Opt_noresvport,
80 Opt_fscache, Opt_nofscache,
81
82 /* Mount options that take integer arguments */
83 Opt_port,
84 Opt_rsize, Opt_wsize, Opt_bsize,
85 Opt_timeo, Opt_retrans,
86 Opt_acregmin, Opt_acregmax,
87 Opt_acdirmin, Opt_acdirmax,
88 Opt_actimeo,
89 Opt_namelen,
90 Opt_mountport,
91 Opt_mountvers,
92 Opt_nfsvers,
93
94 /* Mount options that take string arguments */
95 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
96 Opt_addr, Opt_mountaddr, Opt_clientaddr,
97 Opt_lookupcache,
98 Opt_fscache_uniq,
99
100 /* Special mount options */
101 Opt_userspace, Opt_deprecated, Opt_sloppy,
102
103 Opt_err
104 };
105
106 static const match_table_t nfs_mount_option_tokens = {
107 { Opt_userspace, "bg" },
108 { Opt_userspace, "fg" },
109 { Opt_userspace, "retry=%s" },
110
111 { Opt_sloppy, "sloppy" },
112
113 { Opt_soft, "soft" },
114 { Opt_hard, "hard" },
115 { Opt_deprecated, "intr" },
116 { Opt_deprecated, "nointr" },
117 { Opt_posix, "posix" },
118 { Opt_noposix, "noposix" },
119 { Opt_cto, "cto" },
120 { Opt_nocto, "nocto" },
121 { Opt_ac, "ac" },
122 { Opt_noac, "noac" },
123 { Opt_lock, "lock" },
124 { Opt_nolock, "nolock" },
125 { Opt_v2, "v2" },
126 { Opt_v3, "v3" },
127 { Opt_udp, "udp" },
128 { Opt_tcp, "tcp" },
129 { Opt_rdma, "rdma" },
130 { Opt_acl, "acl" },
131 { Opt_noacl, "noacl" },
132 { Opt_rdirplus, "rdirplus" },
133 { Opt_nordirplus, "nordirplus" },
134 { Opt_sharecache, "sharecache" },
135 { Opt_nosharecache, "nosharecache" },
136 { Opt_resvport, "resvport" },
137 { Opt_noresvport, "noresvport" },
138 { Opt_fscache, "fsc" },
139 { Opt_fscache_uniq, "fsc=%s" },
140 { Opt_nofscache, "nofsc" },
141
142 { Opt_port, "port=%u" },
143 { Opt_rsize, "rsize=%u" },
144 { Opt_wsize, "wsize=%u" },
145 { Opt_bsize, "bsize=%u" },
146 { Opt_timeo, "timeo=%u" },
147 { Opt_retrans, "retrans=%u" },
148 { Opt_acregmin, "acregmin=%u" },
149 { Opt_acregmax, "acregmax=%u" },
150 { Opt_acdirmin, "acdirmin=%u" },
151 { Opt_acdirmax, "acdirmax=%u" },
152 { Opt_actimeo, "actimeo=%u" },
153 { Opt_namelen, "namlen=%u" },
154 { Opt_mountport, "mountport=%u" },
155 { Opt_mountvers, "mountvers=%u" },
156 { Opt_nfsvers, "nfsvers=%u" },
157 { Opt_nfsvers, "vers=%u" },
158
159 { Opt_sec, "sec=%s" },
160 { Opt_proto, "proto=%s" },
161 { Opt_mountproto, "mountproto=%s" },
162 { Opt_addr, "addr=%s" },
163 { Opt_clientaddr, "clientaddr=%s" },
164 { Opt_mounthost, "mounthost=%s" },
165 { Opt_mountaddr, "mountaddr=%s" },
166
167 { Opt_lookupcache, "lookupcache=%s" },
168
169 { Opt_err, NULL }
170 };
171
172 enum {
173 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
174
175 Opt_xprt_err
176 };
177
178 static const match_table_t nfs_xprt_protocol_tokens = {
179 { Opt_xprt_udp, "udp" },
180 { Opt_xprt_tcp, "tcp" },
181 { Opt_xprt_rdma, "rdma" },
182
183 { Opt_xprt_err, NULL }
184 };
185
186 enum {
187 Opt_sec_none, Opt_sec_sys,
188 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
189 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
190 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
191
192 Opt_sec_err
193 };
194
195 static const match_table_t nfs_secflavor_tokens = {
196 { Opt_sec_none, "none" },
197 { Opt_sec_none, "null" },
198 { Opt_sec_sys, "sys" },
199
200 { Opt_sec_krb5, "krb5" },
201 { Opt_sec_krb5i, "krb5i" },
202 { Opt_sec_krb5p, "krb5p" },
203
204 { Opt_sec_lkey, "lkey" },
205 { Opt_sec_lkeyi, "lkeyi" },
206 { Opt_sec_lkeyp, "lkeyp" },
207
208 { Opt_sec_spkm, "spkm3" },
209 { Opt_sec_spkmi, "spkm3i" },
210 { Opt_sec_spkmp, "spkm3p" },
211
212 { Opt_sec_err, NULL }
213 };
214
215 enum {
216 Opt_lookupcache_all, Opt_lookupcache_positive,
217 Opt_lookupcache_none,
218
219 Opt_lookupcache_err
220 };
221
222 static match_table_t nfs_lookupcache_tokens = {
223 { Opt_lookupcache_all, "all" },
224 { Opt_lookupcache_positive, "pos" },
225 { Opt_lookupcache_positive, "positive" },
226 { Opt_lookupcache_none, "none" },
227
228 { Opt_lookupcache_err, NULL }
229 };
230
231
232 static void nfs_umount_begin(struct super_block *);
233 static int nfs_statfs(struct dentry *, struct kstatfs *);
234 static int nfs_show_options(struct seq_file *, struct vfsmount *);
235 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
236 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
237 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
238 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
239 static void nfs_kill_super(struct super_block *);
240 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
241
242 static struct file_system_type nfs_fs_type = {
243 .owner = THIS_MODULE,
244 .name = "nfs",
245 .get_sb = nfs_get_sb,
246 .kill_sb = nfs_kill_super,
247 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
248 };
249
250 struct file_system_type nfs_xdev_fs_type = {
251 .owner = THIS_MODULE,
252 .name = "nfs",
253 .get_sb = nfs_xdev_get_sb,
254 .kill_sb = nfs_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
256 };
257
258 static const struct super_operations nfs_sops = {
259 .alloc_inode = nfs_alloc_inode,
260 .destroy_inode = nfs_destroy_inode,
261 .write_inode = nfs_write_inode,
262 .statfs = nfs_statfs,
263 .clear_inode = nfs_clear_inode,
264 .umount_begin = nfs_umount_begin,
265 .show_options = nfs_show_options,
266 .show_stats = nfs_show_stats,
267 .remount_fs = nfs_remount,
268 };
269
270 #ifdef CONFIG_NFS_V4
271 static int nfs4_get_sb(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
273 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
274 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
275 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
277 static void nfs4_kill_super(struct super_block *sb);
278
279 static struct file_system_type nfs4_fs_type = {
280 .owner = THIS_MODULE,
281 .name = "nfs4",
282 .get_sb = nfs4_get_sb,
283 .kill_sb = nfs4_kill_super,
284 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
285 };
286
287 struct file_system_type nfs4_xdev_fs_type = {
288 .owner = THIS_MODULE,
289 .name = "nfs4",
290 .get_sb = nfs4_xdev_get_sb,
291 .kill_sb = nfs4_kill_super,
292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
293 };
294
295 struct file_system_type nfs4_referral_fs_type = {
296 .owner = THIS_MODULE,
297 .name = "nfs4",
298 .get_sb = nfs4_referral_get_sb,
299 .kill_sb = nfs4_kill_super,
300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
301 };
302
303 static const struct super_operations nfs4_sops = {
304 .alloc_inode = nfs_alloc_inode,
305 .destroy_inode = nfs_destroy_inode,
306 .write_inode = nfs_write_inode,
307 .statfs = nfs_statfs,
308 .clear_inode = nfs4_clear_inode,
309 .umount_begin = nfs_umount_begin,
310 .show_options = nfs_show_options,
311 .show_stats = nfs_show_stats,
312 .remount_fs = nfs_remount,
313 };
314 #endif
315
316 static struct shrinker acl_shrinker = {
317 .shrink = nfs_access_cache_shrinker,
318 .seeks = DEFAULT_SEEKS,
319 };
320
321 /*
322 * Register the NFS filesystems
323 */
324 int __init register_nfs_fs(void)
325 {
326 int ret;
327
328 ret = register_filesystem(&nfs_fs_type);
329 if (ret < 0)
330 goto error_0;
331
332 ret = nfs_register_sysctl();
333 if (ret < 0)
334 goto error_1;
335 #ifdef CONFIG_NFS_V4
336 ret = register_filesystem(&nfs4_fs_type);
337 if (ret < 0)
338 goto error_2;
339 #endif
340 register_shrinker(&acl_shrinker);
341 return 0;
342
343 #ifdef CONFIG_NFS_V4
344 error_2:
345 nfs_unregister_sysctl();
346 #endif
347 error_1:
348 unregister_filesystem(&nfs_fs_type);
349 error_0:
350 return ret;
351 }
352
353 /*
354 * Unregister the NFS filesystems
355 */
356 void __exit unregister_nfs_fs(void)
357 {
358 unregister_shrinker(&acl_shrinker);
359 #ifdef CONFIG_NFS_V4
360 unregister_filesystem(&nfs4_fs_type);
361 #endif
362 nfs_unregister_sysctl();
363 unregister_filesystem(&nfs_fs_type);
364 }
365
366 void nfs_sb_active(struct super_block *sb)
367 {
368 struct nfs_server *server = NFS_SB(sb);
369
370 if (atomic_inc_return(&server->active) == 1)
371 atomic_inc(&sb->s_active);
372 }
373
374 void nfs_sb_deactive(struct super_block *sb)
375 {
376 struct nfs_server *server = NFS_SB(sb);
377
378 if (atomic_dec_and_test(&server->active))
379 deactivate_super(sb);
380 }
381
382 /*
383 * Deliver file system statistics to userspace
384 */
385 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
386 {
387 struct nfs_server *server = NFS_SB(dentry->d_sb);
388 unsigned char blockbits;
389 unsigned long blockres;
390 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
391 struct nfs_fattr fattr;
392 struct nfs_fsstat res = {
393 .fattr = &fattr,
394 };
395 int error;
396
397 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
398 if (error < 0)
399 goto out_err;
400 buf->f_type = NFS_SUPER_MAGIC;
401
402 /*
403 * Current versions of glibc do not correctly handle the
404 * case where f_frsize != f_bsize. Eventually we want to
405 * report the value of wtmult in this field.
406 */
407 buf->f_frsize = dentry->d_sb->s_blocksize;
408
409 /*
410 * On most *nix systems, f_blocks, f_bfree, and f_bavail
411 * are reported in units of f_frsize. Linux hasn't had
412 * an f_frsize field in its statfs struct until recently,
413 * thus historically Linux's sys_statfs reports these
414 * fields in units of f_bsize.
415 */
416 buf->f_bsize = dentry->d_sb->s_blocksize;
417 blockbits = dentry->d_sb->s_blocksize_bits;
418 blockres = (1 << blockbits) - 1;
419 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
420 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
421 buf->f_bavail = (res.abytes + blockres) >> blockbits;
422
423 buf->f_files = res.tfiles;
424 buf->f_ffree = res.afiles;
425
426 buf->f_namelen = server->namelen;
427
428 return 0;
429
430 out_err:
431 dprintk("%s: statfs error = %d\n", __func__, -error);
432 return error;
433 }
434
435 /*
436 * Map the security flavour number to a name
437 */
438 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
439 {
440 static const struct {
441 rpc_authflavor_t flavour;
442 const char *str;
443 } sec_flavours[] = {
444 { RPC_AUTH_NULL, "null" },
445 { RPC_AUTH_UNIX, "sys" },
446 { RPC_AUTH_GSS_KRB5, "krb5" },
447 { RPC_AUTH_GSS_KRB5I, "krb5i" },
448 { RPC_AUTH_GSS_KRB5P, "krb5p" },
449 { RPC_AUTH_GSS_LKEY, "lkey" },
450 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
451 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
452 { RPC_AUTH_GSS_SPKM, "spkm" },
453 { RPC_AUTH_GSS_SPKMI, "spkmi" },
454 { RPC_AUTH_GSS_SPKMP, "spkmp" },
455 { UINT_MAX, "unknown" }
456 };
457 int i;
458
459 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
460 if (sec_flavours[i].flavour == flavour)
461 break;
462 }
463 return sec_flavours[i].str;
464 }
465
466 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
467 int showdefaults)
468 {
469 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
470
471 switch (sap->sa_family) {
472 case AF_INET: {
473 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
474 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
475 break;
476 }
477 case AF_INET6: {
478 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
479 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
480 break;
481 }
482 default:
483 if (showdefaults)
484 seq_printf(m, ",mountaddr=unspecified");
485 }
486
487 if (nfss->mountd_version || showdefaults)
488 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
489 if (nfss->mountd_port || showdefaults)
490 seq_printf(m, ",mountport=%u", nfss->mountd_port);
491
492 switch (nfss->mountd_protocol) {
493 case IPPROTO_UDP:
494 seq_printf(m, ",mountproto=udp");
495 break;
496 case IPPROTO_TCP:
497 seq_printf(m, ",mountproto=tcp");
498 break;
499 default:
500 if (showdefaults)
501 seq_printf(m, ",mountproto=auto");
502 }
503 }
504
505 /*
506 * Describe the mount options in force on this server representation
507 */
508 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
509 int showdefaults)
510 {
511 static const struct proc_nfs_info {
512 int flag;
513 const char *str;
514 const char *nostr;
515 } nfs_info[] = {
516 { NFS_MOUNT_SOFT, ",soft", ",hard" },
517 { NFS_MOUNT_INTR, ",intr", ",nointr" },
518 { NFS_MOUNT_POSIX, ",posix", "" },
519 { NFS_MOUNT_NOCTO, ",nocto", "" },
520 { NFS_MOUNT_NOAC, ",noac", "" },
521 { NFS_MOUNT_NONLM, ",nolock", "" },
522 { NFS_MOUNT_NOACL, ",noacl", "" },
523 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
524 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
525 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
526 { 0, NULL, NULL }
527 };
528 const struct proc_nfs_info *nfs_infop;
529 struct nfs_client *clp = nfss->nfs_client;
530 u32 version = clp->rpc_ops->version;
531
532 seq_printf(m, ",vers=%u", version);
533 seq_printf(m, ",rsize=%u", nfss->rsize);
534 seq_printf(m, ",wsize=%u", nfss->wsize);
535 if (nfss->bsize != 0)
536 seq_printf(m, ",bsize=%u", nfss->bsize);
537 seq_printf(m, ",namlen=%u", nfss->namelen);
538 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
539 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
540 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
541 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
542 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
543 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
544 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
545 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
546 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
547 if (nfss->flags & nfs_infop->flag)
548 seq_puts(m, nfs_infop->str);
549 else
550 seq_puts(m, nfs_infop->nostr);
551 }
552 seq_printf(m, ",proto=%s",
553 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
554 if (version == 4) {
555 if (nfss->port != NFS_PORT)
556 seq_printf(m, ",port=%u", nfss->port);
557 } else
558 if (nfss->port)
559 seq_printf(m, ",port=%u", nfss->port);
560
561 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
562 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
563 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
564
565 if (version != 4)
566 nfs_show_mountd_options(m, nfss, showdefaults);
567
568 #ifdef CONFIG_NFS_V4
569 if (clp->rpc_ops->version == 4)
570 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
571 #endif
572 if (nfss->options & NFS_OPTION_FSCACHE)
573 seq_printf(m, ",fsc");
574 }
575
576 /*
577 * Describe the mount options on this VFS mountpoint
578 */
579 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
580 {
581 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
582
583 nfs_show_mount_options(m, nfss, 0);
584
585 seq_printf(m, ",addr=%s",
586 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
587 RPC_DISPLAY_ADDR));
588
589 return 0;
590 }
591
592 /*
593 * Present statistical information for this VFS mountpoint
594 */
595 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
596 {
597 int i, cpu;
598 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
599 struct rpc_auth *auth = nfss->client->cl_auth;
600 struct nfs_iostats totals = { };
601
602 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
603
604 /*
605 * Display all mount option settings
606 */
607 seq_printf(m, "\n\topts:\t");
608 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
609 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
610 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
611 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
612 nfs_show_mount_options(m, nfss, 1);
613
614 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
615
616 seq_printf(m, "\n\tcaps:\t");
617 seq_printf(m, "caps=0x%x", nfss->caps);
618 seq_printf(m, ",wtmult=%u", nfss->wtmult);
619 seq_printf(m, ",dtsize=%u", nfss->dtsize);
620 seq_printf(m, ",bsize=%u", nfss->bsize);
621 seq_printf(m, ",namlen=%u", nfss->namelen);
622
623 #ifdef CONFIG_NFS_V4
624 if (nfss->nfs_client->rpc_ops->version == 4) {
625 seq_printf(m, "\n\tnfsv4:\t");
626 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
627 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
628 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
629 }
630 #endif
631
632 /*
633 * Display security flavor in effect for this mount
634 */
635 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
636 if (auth->au_flavor)
637 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
638
639 /*
640 * Display superblock I/O counters
641 */
642 for_each_possible_cpu(cpu) {
643 struct nfs_iostats *stats;
644
645 preempt_disable();
646 stats = per_cpu_ptr(nfss->io_stats, cpu);
647
648 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
649 totals.events[i] += stats->events[i];
650 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
651 totals.bytes[i] += stats->bytes[i];
652 #ifdef CONFIG_NFS_FSCACHE
653 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
654 totals.fscache[i] += stats->fscache[i];
655 #endif
656
657 preempt_enable();
658 }
659
660 seq_printf(m, "\n\tevents:\t");
661 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
662 seq_printf(m, "%lu ", totals.events[i]);
663 seq_printf(m, "\n\tbytes:\t");
664 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
665 seq_printf(m, "%Lu ", totals.bytes[i]);
666 #ifdef CONFIG_NFS_FSCACHE
667 if (nfss->options & NFS_OPTION_FSCACHE) {
668 seq_printf(m, "\n\tfsc:\t");
669 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
670 seq_printf(m, "%Lu ", totals.bytes[i]);
671 }
672 #endif
673 seq_printf(m, "\n");
674
675 rpc_print_iostats(m, nfss->client);
676
677 return 0;
678 }
679
680 /*
681 * Begin unmount by attempting to remove all automounted mountpoints we added
682 * in response to xdev traversals and referrals
683 */
684 static void nfs_umount_begin(struct super_block *sb)
685 {
686 struct nfs_server *server;
687 struct rpc_clnt *rpc;
688
689 lock_kernel();
690
691 server = NFS_SB(sb);
692 /* -EIO all pending I/O */
693 rpc = server->client_acl;
694 if (!IS_ERR(rpc))
695 rpc_killall_tasks(rpc);
696 rpc = server->client;
697 if (!IS_ERR(rpc))
698 rpc_killall_tasks(rpc);
699
700 unlock_kernel();
701 }
702
703 /*
704 * Sanity-check a server address provided by the mount command.
705 *
706 * Address family must be initialized, and address must not be
707 * the ANY address for that family.
708 */
709 static int nfs_verify_server_address(struct sockaddr *addr)
710 {
711 switch (addr->sa_family) {
712 case AF_INET: {
713 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
714 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
715 }
716 case AF_INET6: {
717 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
718 return !ipv6_addr_any(sa);
719 }
720 }
721
722 return 0;
723 }
724
725 static void nfs_parse_ipv4_address(char *string, size_t str_len,
726 struct sockaddr *sap, size_t *addr_len)
727 {
728 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
729 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
730
731 if (str_len <= INET_ADDRSTRLEN) {
732 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
733 (int)str_len, string);
734
735 sin->sin_family = AF_INET;
736 *addr_len = sizeof(*sin);
737 if (in4_pton(string, str_len, addr, '\0', NULL))
738 return;
739 }
740
741 sap->sa_family = AF_UNSPEC;
742 *addr_len = 0;
743 }
744
745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
746 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
747 const char *delim,
748 struct sockaddr_in6 *sin6)
749 {
750 char *p;
751 size_t len;
752
753 if ((string + str_len) == delim)
754 return 1;
755
756 if (*delim != IPV6_SCOPE_DELIMITER)
757 return 0;
758
759 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
760 return 0;
761
762 len = (string + str_len) - delim - 1;
763 p = kstrndup(delim + 1, len, GFP_KERNEL);
764 if (p) {
765 unsigned long scope_id = 0;
766 struct net_device *dev;
767
768 dev = dev_get_by_name(&init_net, p);
769 if (dev != NULL) {
770 scope_id = dev->ifindex;
771 dev_put(dev);
772 } else {
773 if (strict_strtoul(p, 10, &scope_id) == 0) {
774 kfree(p);
775 return 0;
776 }
777 }
778
779 kfree(p);
780
781 sin6->sin6_scope_id = scope_id;
782 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
783 return 1;
784 }
785
786 return 0;
787 }
788
789 static void nfs_parse_ipv6_address(char *string, size_t str_len,
790 struct sockaddr *sap, size_t *addr_len)
791 {
792 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
793 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
794 const char *delim;
795
796 if (str_len <= INET6_ADDRSTRLEN) {
797 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
798 (int)str_len, string);
799
800 sin6->sin6_family = AF_INET6;
801 *addr_len = sizeof(*sin6);
802 if (in6_pton(string, str_len, addr,
803 IPV6_SCOPE_DELIMITER, &delim) != 0) {
804 if (nfs_parse_ipv6_scope_id(string, str_len,
805 delim, sin6) != 0)
806 return;
807 }
808 }
809
810 sap->sa_family = AF_UNSPEC;
811 *addr_len = 0;
812 }
813 #else
814 static void nfs_parse_ipv6_address(char *string, size_t str_len,
815 struct sockaddr *sap, size_t *addr_len)
816 {
817 sap->sa_family = AF_UNSPEC;
818 *addr_len = 0;
819 }
820 #endif
821
822 /*
823 * Construct a sockaddr based on the contents of a string that contains
824 * an IP address in presentation format.
825 *
826 * If there is a problem constructing the new sockaddr, set the address
827 * family to AF_UNSPEC.
828 */
829 void nfs_parse_ip_address(char *string, size_t str_len,
830 struct sockaddr *sap, size_t *addr_len)
831 {
832 unsigned int i, colons;
833
834 colons = 0;
835 for (i = 0; i < str_len; i++)
836 if (string[i] == ':')
837 colons++;
838
839 if (colons >= 2)
840 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
841 else
842 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
843 }
844
845 /*
846 * Sanity check the NFS transport protocol.
847 *
848 */
849 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
850 {
851 switch (mnt->nfs_server.protocol) {
852 case XPRT_TRANSPORT_UDP:
853 case XPRT_TRANSPORT_TCP:
854 case XPRT_TRANSPORT_RDMA:
855 break;
856 default:
857 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
858 }
859 }
860
861 /*
862 * For text based NFSv2/v3 mounts, the mount protocol transport default
863 * settings should depend upon the specified NFS transport.
864 */
865 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
866 {
867 nfs_validate_transport_protocol(mnt);
868
869 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
870 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
871 return;
872 switch (mnt->nfs_server.protocol) {
873 case XPRT_TRANSPORT_UDP:
874 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
875 break;
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
878 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
879 }
880 }
881
882 /*
883 * Parse the value of the 'sec=' option.
884 *
885 * The flavor_len setting is for v4 mounts.
886 */
887 static int nfs_parse_security_flavors(char *value,
888 struct nfs_parsed_mount_data *mnt)
889 {
890 substring_t args[MAX_OPT_ARGS];
891
892 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
893
894 switch (match_token(value, nfs_secflavor_tokens, args)) {
895 case Opt_sec_none:
896 mnt->auth_flavor_len = 0;
897 mnt->auth_flavors[0] = RPC_AUTH_NULL;
898 break;
899 case Opt_sec_sys:
900 mnt->auth_flavor_len = 0;
901 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
902 break;
903 case Opt_sec_krb5:
904 mnt->auth_flavor_len = 1;
905 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
906 break;
907 case Opt_sec_krb5i:
908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
910 break;
911 case Opt_sec_krb5p:
912 mnt->auth_flavor_len = 1;
913 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
914 break;
915 case Opt_sec_lkey:
916 mnt->auth_flavor_len = 1;
917 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
918 break;
919 case Opt_sec_lkeyi:
920 mnt->auth_flavor_len = 1;
921 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
922 break;
923 case Opt_sec_lkeyp:
924 mnt->auth_flavor_len = 1;
925 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
926 break;
927 case Opt_sec_spkm:
928 mnt->auth_flavor_len = 1;
929 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
930 break;
931 case Opt_sec_spkmi:
932 mnt->auth_flavor_len = 1;
933 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
934 break;
935 case Opt_sec_spkmp:
936 mnt->auth_flavor_len = 1;
937 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
938 break;
939 default:
940 return 0;
941 }
942
943 return 1;
944 }
945
946 static void nfs_parse_invalid_value(const char *option)
947 {
948 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
949 }
950
951 /*
952 * Error-check and convert a string of mount options from user space into
953 * a data structure. The whole mount string is processed; bad options are
954 * skipped as they are encountered. If there were no errors, return 1;
955 * otherwise return 0 (zero).
956 */
957 static int nfs_parse_mount_options(char *raw,
958 struct nfs_parsed_mount_data *mnt)
959 {
960 char *p, *string, *secdata;
961 int rc, sloppy = 0, errors = 0;
962
963 if (!raw) {
964 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
965 return 1;
966 }
967 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
968
969 secdata = alloc_secdata();
970 if (!secdata)
971 goto out_nomem;
972
973 rc = security_sb_copy_data(raw, secdata);
974 if (rc)
975 goto out_security_failure;
976
977 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
978 if (rc)
979 goto out_security_failure;
980
981 free_secdata(secdata);
982
983 while ((p = strsep(&raw, ",")) != NULL) {
984 substring_t args[MAX_OPT_ARGS];
985 int option, token;
986
987 if (!*p)
988 continue;
989
990 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
991
992 token = match_token(p, nfs_mount_option_tokens, args);
993 switch (token) {
994
995 /*
996 * boolean options: foo/nofoo
997 */
998 case Opt_soft:
999 mnt->flags |= NFS_MOUNT_SOFT;
1000 break;
1001 case Opt_hard:
1002 mnt->flags &= ~NFS_MOUNT_SOFT;
1003 break;
1004 case Opt_posix:
1005 mnt->flags |= NFS_MOUNT_POSIX;
1006 break;
1007 case Opt_noposix:
1008 mnt->flags &= ~NFS_MOUNT_POSIX;
1009 break;
1010 case Opt_cto:
1011 mnt->flags &= ~NFS_MOUNT_NOCTO;
1012 break;
1013 case Opt_nocto:
1014 mnt->flags |= NFS_MOUNT_NOCTO;
1015 break;
1016 case Opt_ac:
1017 mnt->flags &= ~NFS_MOUNT_NOAC;
1018 break;
1019 case Opt_noac:
1020 mnt->flags |= NFS_MOUNT_NOAC;
1021 break;
1022 case Opt_lock:
1023 mnt->flags &= ~NFS_MOUNT_NONLM;
1024 break;
1025 case Opt_nolock:
1026 mnt->flags |= NFS_MOUNT_NONLM;
1027 break;
1028 case Opt_v2:
1029 mnt->flags &= ~NFS_MOUNT_VER3;
1030 break;
1031 case Opt_v3:
1032 mnt->flags |= NFS_MOUNT_VER3;
1033 break;
1034 case Opt_udp:
1035 mnt->flags &= ~NFS_MOUNT_TCP;
1036 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1037 break;
1038 case Opt_tcp:
1039 mnt->flags |= NFS_MOUNT_TCP;
1040 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1041 break;
1042 case Opt_rdma:
1043 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1044 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1045 xprt_load_transport(p);
1046 break;
1047 case Opt_acl:
1048 mnt->flags &= ~NFS_MOUNT_NOACL;
1049 break;
1050 case Opt_noacl:
1051 mnt->flags |= NFS_MOUNT_NOACL;
1052 break;
1053 case Opt_rdirplus:
1054 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1055 break;
1056 case Opt_nordirplus:
1057 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1058 break;
1059 case Opt_sharecache:
1060 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1061 break;
1062 case Opt_nosharecache:
1063 mnt->flags |= NFS_MOUNT_UNSHARED;
1064 break;
1065 case Opt_resvport:
1066 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1067 break;
1068 case Opt_noresvport:
1069 mnt->flags |= NFS_MOUNT_NORESVPORT;
1070 break;
1071 case Opt_fscache:
1072 mnt->options |= NFS_OPTION_FSCACHE;
1073 kfree(mnt->fscache_uniq);
1074 mnt->fscache_uniq = NULL;
1075 break;
1076 case Opt_nofscache:
1077 mnt->options &= ~NFS_OPTION_FSCACHE;
1078 kfree(mnt->fscache_uniq);
1079 mnt->fscache_uniq = NULL;
1080 break;
1081 case Opt_fscache_uniq:
1082 string = match_strdup(args);
1083 if (!string)
1084 goto out_nomem;
1085 kfree(mnt->fscache_uniq);
1086 mnt->fscache_uniq = string;
1087 mnt->options |= NFS_OPTION_FSCACHE;
1088 break;
1089
1090 /*
1091 * options that take numeric values
1092 */
1093 case Opt_port:
1094 if (match_int(args, &option) ||
1095 option < 0 || option > USHORT_MAX) {
1096 errors++;
1097 nfs_parse_invalid_value("port");
1098 } else
1099 mnt->nfs_server.port = option;
1100 break;
1101 case Opt_rsize:
1102 if (match_int(args, &option) || option < 0) {
1103 errors++;
1104 nfs_parse_invalid_value("rsize");
1105 } else
1106 mnt->rsize = option;
1107 break;
1108 case Opt_wsize:
1109 if (match_int(args, &option) || option < 0) {
1110 errors++;
1111 nfs_parse_invalid_value("wsize");
1112 } else
1113 mnt->wsize = option;
1114 break;
1115 case Opt_bsize:
1116 if (match_int(args, &option) || option < 0) {
1117 errors++;
1118 nfs_parse_invalid_value("bsize");
1119 } else
1120 mnt->bsize = option;
1121 break;
1122 case Opt_timeo:
1123 if (match_int(args, &option) || option <= 0) {
1124 errors++;
1125 nfs_parse_invalid_value("timeo");
1126 } else
1127 mnt->timeo = option;
1128 break;
1129 case Opt_retrans:
1130 if (match_int(args, &option) || option <= 0) {
1131 errors++;
1132 nfs_parse_invalid_value("retrans");
1133 } else
1134 mnt->retrans = option;
1135 break;
1136 case Opt_acregmin:
1137 if (match_int(args, &option) || option < 0) {
1138 errors++;
1139 nfs_parse_invalid_value("acregmin");
1140 } else
1141 mnt->acregmin = option;
1142 break;
1143 case Opt_acregmax:
1144 if (match_int(args, &option) || option < 0) {
1145 errors++;
1146 nfs_parse_invalid_value("acregmax");
1147 } else
1148 mnt->acregmax = option;
1149 break;
1150 case Opt_acdirmin:
1151 if (match_int(args, &option) || option < 0) {
1152 errors++;
1153 nfs_parse_invalid_value("acdirmin");
1154 } else
1155 mnt->acdirmin = option;
1156 break;
1157 case Opt_acdirmax:
1158 if (match_int(args, &option) || option < 0) {
1159 errors++;
1160 nfs_parse_invalid_value("acdirmax");
1161 } else
1162 mnt->acdirmax = option;
1163 break;
1164 case Opt_actimeo:
1165 if (match_int(args, &option) || option < 0) {
1166 errors++;
1167 nfs_parse_invalid_value("actimeo");
1168 } else
1169 mnt->acregmin = mnt->acregmax =
1170 mnt->acdirmin = mnt->acdirmax = option;
1171 break;
1172 case Opt_namelen:
1173 if (match_int(args, &option) || option < 0) {
1174 errors++;
1175 nfs_parse_invalid_value("namlen");
1176 } else
1177 mnt->namlen = option;
1178 break;
1179 case Opt_mountport:
1180 if (match_int(args, &option) ||
1181 option < 0 || option > USHORT_MAX) {
1182 errors++;
1183 nfs_parse_invalid_value("mountport");
1184 } else
1185 mnt->mount_server.port = option;
1186 break;
1187 case Opt_mountvers:
1188 if (match_int(args, &option) ||
1189 option < NFS_MNT_VERSION ||
1190 option > NFS_MNT3_VERSION) {
1191 errors++;
1192 nfs_parse_invalid_value("mountvers");
1193 } else
1194 mnt->mount_server.version = option;
1195 break;
1196 case Opt_nfsvers:
1197 if (match_int(args, &option)) {
1198 errors++;
1199 nfs_parse_invalid_value("nfsvers");
1200 break;
1201 }
1202 switch (option) {
1203 case NFS2_VERSION:
1204 mnt->flags &= ~NFS_MOUNT_VER3;
1205 break;
1206 case NFS3_VERSION:
1207 mnt->flags |= NFS_MOUNT_VER3;
1208 break;
1209 default:
1210 errors++;
1211 nfs_parse_invalid_value("nfsvers");
1212 }
1213 break;
1214
1215 /*
1216 * options that take text values
1217 */
1218 case Opt_sec:
1219 string = match_strdup(args);
1220 if (string == NULL)
1221 goto out_nomem;
1222 rc = nfs_parse_security_flavors(string, mnt);
1223 kfree(string);
1224 if (!rc) {
1225 errors++;
1226 dfprintk(MOUNT, "NFS: unrecognized "
1227 "security flavor\n");
1228 }
1229 break;
1230 case Opt_proto:
1231 string = match_strdup(args);
1232 if (string == NULL)
1233 goto out_nomem;
1234 token = match_token(string,
1235 nfs_xprt_protocol_tokens, args);
1236
1237 switch (token) {
1238 case Opt_xprt_udp:
1239 mnt->flags &= ~NFS_MOUNT_TCP;
1240 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1241 break;
1242 case Opt_xprt_tcp:
1243 mnt->flags |= NFS_MOUNT_TCP;
1244 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1245 break;
1246 case Opt_xprt_rdma:
1247 /* vector side protocols to TCP */
1248 mnt->flags |= NFS_MOUNT_TCP;
1249 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1250 xprt_load_transport(string);
1251 break;
1252 default:
1253 errors++;
1254 dfprintk(MOUNT, "NFS: unrecognized "
1255 "transport protocol\n");
1256 }
1257 kfree(string);
1258 break;
1259 case Opt_mountproto:
1260 string = match_strdup(args);
1261 if (string == NULL)
1262 goto out_nomem;
1263 token = match_token(string,
1264 nfs_xprt_protocol_tokens, args);
1265 kfree(string);
1266
1267 switch (token) {
1268 case Opt_xprt_udp:
1269 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1270 break;
1271 case Opt_xprt_tcp:
1272 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1273 break;
1274 case Opt_xprt_rdma: /* not used for side protocols */
1275 default:
1276 errors++;
1277 dfprintk(MOUNT, "NFS: unrecognized "
1278 "transport protocol\n");
1279 }
1280 break;
1281 case Opt_addr:
1282 string = match_strdup(args);
1283 if (string == NULL)
1284 goto out_nomem;
1285 nfs_parse_ip_address(string, strlen(string),
1286 (struct sockaddr *)
1287 &mnt->nfs_server.address,
1288 &mnt->nfs_server.addrlen);
1289 kfree(string);
1290 break;
1291 case Opt_clientaddr:
1292 string = match_strdup(args);
1293 if (string == NULL)
1294 goto out_nomem;
1295 kfree(mnt->client_address);
1296 mnt->client_address = string;
1297 break;
1298 case Opt_mounthost:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
1302 kfree(mnt->mount_server.hostname);
1303 mnt->mount_server.hostname = string;
1304 break;
1305 case Opt_mountaddr:
1306 string = match_strdup(args);
1307 if (string == NULL)
1308 goto out_nomem;
1309 nfs_parse_ip_address(string, strlen(string),
1310 (struct sockaddr *)
1311 &mnt->mount_server.address,
1312 &mnt->mount_server.addrlen);
1313 kfree(string);
1314 break;
1315 case Opt_lookupcache:
1316 string = match_strdup(args);
1317 if (string == NULL)
1318 goto out_nomem;
1319 token = match_token(string,
1320 nfs_lookupcache_tokens, args);
1321 kfree(string);
1322 switch (token) {
1323 case Opt_lookupcache_all:
1324 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1325 break;
1326 case Opt_lookupcache_positive:
1327 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1328 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1329 break;
1330 case Opt_lookupcache_none:
1331 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1332 break;
1333 default:
1334 errors++;
1335 dfprintk(MOUNT, "NFS: invalid "
1336 "lookupcache argument\n");
1337 };
1338 break;
1339
1340 /*
1341 * Special options
1342 */
1343 case Opt_sloppy:
1344 sloppy = 1;
1345 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1346 break;
1347 case Opt_userspace:
1348 case Opt_deprecated:
1349 dfprintk(MOUNT, "NFS: ignoring mount option "
1350 "'%s'\n", p);
1351 break;
1352
1353 default:
1354 errors++;
1355 dfprintk(MOUNT, "NFS: unrecognized mount option "
1356 "'%s'\n", p);
1357 }
1358 }
1359
1360 if (errors > 0) {
1361 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1362 errors, (errors == 1 ? "" : "s"));
1363 if (!sloppy)
1364 return 0;
1365 }
1366 return 1;
1367
1368 out_nomem:
1369 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1370 return 0;
1371 out_security_failure:
1372 free_secdata(secdata);
1373 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1374 return 0;
1375 }
1376
1377 /*
1378 * Use the remote server's MOUNT service to request the NFS file handle
1379 * corresponding to the provided path.
1380 */
1381 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1382 struct nfs_fh *root_fh)
1383 {
1384 struct nfs_mount_request request = {
1385 .sap = (struct sockaddr *)
1386 &args->mount_server.address,
1387 .dirpath = args->nfs_server.export_path,
1388 .protocol = args->mount_server.protocol,
1389 .fh = root_fh,
1390 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1391 };
1392 int status;
1393
1394 if (args->mount_server.version == 0) {
1395 if (args->flags & NFS_MOUNT_VER3)
1396 args->mount_server.version = NFS_MNT3_VERSION;
1397 else
1398 args->mount_server.version = NFS_MNT_VERSION;
1399 }
1400 request.version = args->mount_server.version;
1401
1402 if (args->mount_server.hostname)
1403 request.hostname = args->mount_server.hostname;
1404 else
1405 request.hostname = args->nfs_server.hostname;
1406
1407 /*
1408 * Construct the mount server's address.
1409 */
1410 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1411 memcpy(request.sap, &args->nfs_server.address,
1412 args->nfs_server.addrlen);
1413 args->mount_server.addrlen = args->nfs_server.addrlen;
1414 }
1415 request.salen = args->mount_server.addrlen;
1416
1417 /*
1418 * autobind will be used if mount_server.port == 0
1419 */
1420 nfs_set_port(request.sap, args->mount_server.port);
1421
1422 /*
1423 * Now ask the mount server to map our export path
1424 * to a file handle.
1425 */
1426 status = nfs_mount(&request);
1427 if (status == 0)
1428 return 0;
1429
1430 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1431 request.hostname, status);
1432 return status;
1433 }
1434
1435 static int nfs_parse_simple_hostname(const char *dev_name,
1436 char **hostname, size_t maxnamlen,
1437 char **export_path, size_t maxpathlen)
1438 {
1439 size_t len;
1440 char *colon, *comma;
1441
1442 colon = strchr(dev_name, ':');
1443 if (colon == NULL)
1444 goto out_bad_devname;
1445
1446 len = colon - dev_name;
1447 if (len > maxnamlen)
1448 goto out_hostname;
1449
1450 /* N.B. caller will free nfs_server.hostname in all cases */
1451 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1452 if (!*hostname)
1453 goto out_nomem;
1454
1455 /* kill possible hostname list: not supported */
1456 comma = strchr(*hostname, ',');
1457 if (comma != NULL) {
1458 if (comma == *hostname)
1459 goto out_bad_devname;
1460 *comma = '\0';
1461 }
1462
1463 colon++;
1464 len = strlen(colon);
1465 if (len > maxpathlen)
1466 goto out_path;
1467 *export_path = kstrndup(colon, len, GFP_KERNEL);
1468 if (!*export_path)
1469 goto out_nomem;
1470
1471 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1472 return 0;
1473
1474 out_bad_devname:
1475 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1476 return -EINVAL;
1477
1478 out_nomem:
1479 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1480 return -ENOMEM;
1481
1482 out_hostname:
1483 dfprintk(MOUNT, "NFS: server hostname too long\n");
1484 return -ENAMETOOLONG;
1485
1486 out_path:
1487 dfprintk(MOUNT, "NFS: export pathname too long\n");
1488 return -ENAMETOOLONG;
1489 }
1490
1491 /*
1492 * Hostname has square brackets around it because it contains one or
1493 * more colons. We look for the first closing square bracket, and a
1494 * colon must follow it.
1495 */
1496 static int nfs_parse_protected_hostname(const char *dev_name,
1497 char **hostname, size_t maxnamlen,
1498 char **export_path, size_t maxpathlen)
1499 {
1500 size_t len;
1501 char *start, *end;
1502
1503 start = (char *)(dev_name + 1);
1504
1505 end = strchr(start, ']');
1506 if (end == NULL)
1507 goto out_bad_devname;
1508 if (*(end + 1) != ':')
1509 goto out_bad_devname;
1510
1511 len = end - start;
1512 if (len > maxnamlen)
1513 goto out_hostname;
1514
1515 /* N.B. caller will free nfs_server.hostname in all cases */
1516 *hostname = kstrndup(start, len, GFP_KERNEL);
1517 if (*hostname == NULL)
1518 goto out_nomem;
1519
1520 end += 2;
1521 len = strlen(end);
1522 if (len > maxpathlen)
1523 goto out_path;
1524 *export_path = kstrndup(end, len, GFP_KERNEL);
1525 if (!*export_path)
1526 goto out_nomem;
1527
1528 return 0;
1529
1530 out_bad_devname:
1531 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1532 return -EINVAL;
1533
1534 out_nomem:
1535 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1536 return -ENOMEM;
1537
1538 out_hostname:
1539 dfprintk(MOUNT, "NFS: server hostname too long\n");
1540 return -ENAMETOOLONG;
1541
1542 out_path:
1543 dfprintk(MOUNT, "NFS: export pathname too long\n");
1544 return -ENAMETOOLONG;
1545 }
1546
1547 /*
1548 * Split "dev_name" into "hostname:export_path".
1549 *
1550 * The leftmost colon demarks the split between the server's hostname
1551 * and the export path. If the hostname starts with a left square
1552 * bracket, then it may contain colons.
1553 *
1554 * Note: caller frees hostname and export path, even on error.
1555 */
1556 static int nfs_parse_devname(const char *dev_name,
1557 char **hostname, size_t maxnamlen,
1558 char **export_path, size_t maxpathlen)
1559 {
1560 if (*dev_name == '[')
1561 return nfs_parse_protected_hostname(dev_name,
1562 hostname, maxnamlen,
1563 export_path, maxpathlen);
1564
1565 return nfs_parse_simple_hostname(dev_name,
1566 hostname, maxnamlen,
1567 export_path, maxpathlen);
1568 }
1569
1570 /*
1571 * Validate the NFS2/NFS3 mount data
1572 * - fills in the mount root filehandle
1573 *
1574 * For option strings, user space handles the following behaviors:
1575 *
1576 * + DNS: mapping server host name to IP address ("addr=" option)
1577 *
1578 * + failure mode: how to behave if a mount request can't be handled
1579 * immediately ("fg/bg" option)
1580 *
1581 * + retry: how often to retry a mount request ("retry=" option)
1582 *
1583 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1584 * mountproto=tcp after mountproto=udp, and so on
1585 */
1586 static int nfs_validate_mount_data(void *options,
1587 struct nfs_parsed_mount_data *args,
1588 struct nfs_fh *mntfh,
1589 const char *dev_name)
1590 {
1591 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1592
1593 if (data == NULL)
1594 goto out_no_data;
1595
1596 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1597 args->rsize = NFS_MAX_FILE_IO_SIZE;
1598 args->wsize = NFS_MAX_FILE_IO_SIZE;
1599 args->acregmin = NFS_DEF_ACREGMIN;
1600 args->acregmax = NFS_DEF_ACREGMAX;
1601 args->acdirmin = NFS_DEF_ACDIRMIN;
1602 args->acdirmax = NFS_DEF_ACDIRMAX;
1603 args->mount_server.port = 0; /* autobind unless user sets port */
1604 args->nfs_server.port = 0; /* autobind unless user sets port */
1605 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1606 args->auth_flavors[0] = RPC_AUTH_UNIX;
1607
1608 switch (data->version) {
1609 case 1:
1610 data->namlen = 0;
1611 case 2:
1612 data->bsize = 0;
1613 case 3:
1614 if (data->flags & NFS_MOUNT_VER3)
1615 goto out_no_v3;
1616 data->root.size = NFS2_FHSIZE;
1617 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1618 case 4:
1619 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1620 goto out_no_sec;
1621 case 5:
1622 memset(data->context, 0, sizeof(data->context));
1623 case 6:
1624 if (data->flags & NFS_MOUNT_VER3) {
1625 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1626 goto out_invalid_fh;
1627 mntfh->size = data->root.size;
1628 } else
1629 mntfh->size = NFS2_FHSIZE;
1630
1631
1632 memcpy(mntfh->data, data->root.data, mntfh->size);
1633 if (mntfh->size < sizeof(mntfh->data))
1634 memset(mntfh->data + mntfh->size, 0,
1635 sizeof(mntfh->data) - mntfh->size);
1636
1637 /*
1638 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1639 * can deal with.
1640 */
1641 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1642 args->rsize = data->rsize;
1643 args->wsize = data->wsize;
1644 args->timeo = data->timeo;
1645 args->retrans = data->retrans;
1646 args->acregmin = data->acregmin;
1647 args->acregmax = data->acregmax;
1648 args->acdirmin = data->acdirmin;
1649 args->acdirmax = data->acdirmax;
1650
1651 memcpy(&args->nfs_server.address, &data->addr,
1652 sizeof(data->addr));
1653 args->nfs_server.addrlen = sizeof(data->addr);
1654 if (!nfs_verify_server_address((struct sockaddr *)
1655 &args->nfs_server.address))
1656 goto out_no_address;
1657
1658 if (!(data->flags & NFS_MOUNT_TCP))
1659 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1660 /* N.B. caller will free nfs_server.hostname in all cases */
1661 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1662 args->namlen = data->namlen;
1663 args->bsize = data->bsize;
1664
1665 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1666 args->auth_flavors[0] = data->pseudoflavor;
1667 if (!args->nfs_server.hostname)
1668 goto out_nomem;
1669
1670 /*
1671 * The legacy version 6 binary mount data from userspace has a
1672 * field used only to transport selinux information into the
1673 * the kernel. To continue to support that functionality we
1674 * have a touch of selinux knowledge here in the NFS code. The
1675 * userspace code converted context=blah to just blah so we are
1676 * converting back to the full string selinux understands.
1677 */
1678 if (data->context[0]){
1679 #ifdef CONFIG_SECURITY_SELINUX
1680 int rc;
1681 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1682 if (!opts_str)
1683 return -ENOMEM;
1684 strcpy(opts_str, "context=");
1685 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1686 strcat(opts_str, &data->context[0]);
1687 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1688 kfree(opts_str);
1689 if (rc)
1690 return rc;
1691 #else
1692 return -EINVAL;
1693 #endif
1694 }
1695
1696 break;
1697 default: {
1698 int status;
1699
1700 if (nfs_parse_mount_options((char *)options, args) == 0)
1701 return -EINVAL;
1702
1703 if (!nfs_verify_server_address((struct sockaddr *)
1704 &args->nfs_server.address))
1705 goto out_no_address;
1706
1707 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1708 args->nfs_server.port);
1709
1710 nfs_set_mount_transport_protocol(args);
1711
1712 status = nfs_parse_devname(dev_name,
1713 &args->nfs_server.hostname,
1714 PAGE_SIZE,
1715 &args->nfs_server.export_path,
1716 NFS_MAXPATHLEN);
1717 if (!status)
1718 status = nfs_try_mount(args, mntfh);
1719
1720 kfree(args->nfs_server.export_path);
1721 args->nfs_server.export_path = NULL;
1722
1723 if (status)
1724 return status;
1725
1726 break;
1727 }
1728 }
1729
1730 #ifndef CONFIG_NFS_V3
1731 if (args->flags & NFS_MOUNT_VER3)
1732 goto out_v3_not_compiled;
1733 #endif /* !CONFIG_NFS_V3 */
1734
1735 return 0;
1736
1737 out_no_data:
1738 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1739 return -EINVAL;
1740
1741 out_no_v3:
1742 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1743 data->version);
1744 return -EINVAL;
1745
1746 out_no_sec:
1747 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1748 return -EINVAL;
1749
1750 #ifndef CONFIG_NFS_V3
1751 out_v3_not_compiled:
1752 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1753 return -EPROTONOSUPPORT;
1754 #endif /* !CONFIG_NFS_V3 */
1755
1756 out_nomem:
1757 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1758 return -ENOMEM;
1759
1760 out_no_address:
1761 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1762 return -EINVAL;
1763
1764 out_invalid_fh:
1765 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1766 return -EINVAL;
1767 }
1768
1769 static int
1770 nfs_compare_remount_data(struct nfs_server *nfss,
1771 struct nfs_parsed_mount_data *data)
1772 {
1773 if (data->flags != nfss->flags ||
1774 data->rsize != nfss->rsize ||
1775 data->wsize != nfss->wsize ||
1776 data->retrans != nfss->client->cl_timeout->to_retries ||
1777 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1778 data->acregmin != nfss->acregmin / HZ ||
1779 data->acregmax != nfss->acregmax / HZ ||
1780 data->acdirmin != nfss->acdirmin / HZ ||
1781 data->acdirmax != nfss->acdirmax / HZ ||
1782 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1783 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1784 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1785 data->nfs_server.addrlen) != 0)
1786 return -EINVAL;
1787
1788 return 0;
1789 }
1790
1791 static int
1792 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1793 {
1794 int error;
1795 struct nfs_server *nfss = sb->s_fs_info;
1796 struct nfs_parsed_mount_data *data;
1797 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1798 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1799 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1800
1801 /*
1802 * Userspace mount programs that send binary options generally send
1803 * them populated with default values. We have no way to know which
1804 * ones were explicitly specified. Fall back to legacy behavior and
1805 * just return success.
1806 */
1807 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1808 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1809 options->version <= 6))))
1810 return 0;
1811
1812 data = kzalloc(sizeof(*data), GFP_KERNEL);
1813 if (data == NULL)
1814 return -ENOMEM;
1815
1816 /* fill out struct with values from existing mount */
1817 data->flags = nfss->flags;
1818 data->rsize = nfss->rsize;
1819 data->wsize = nfss->wsize;
1820 data->retrans = nfss->client->cl_timeout->to_retries;
1821 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1822 data->acregmin = nfss->acregmin / HZ;
1823 data->acregmax = nfss->acregmax / HZ;
1824 data->acdirmin = nfss->acdirmin / HZ;
1825 data->acdirmax = nfss->acdirmax / HZ;
1826 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1827 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1828 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1829 data->nfs_server.addrlen);
1830
1831 /* overwrite those values with any that were specified */
1832 error = nfs_parse_mount_options((char *)options, data);
1833 if (error < 0)
1834 goto out;
1835
1836 /* compare new mount options with old ones */
1837 error = nfs_compare_remount_data(nfss, data);
1838 out:
1839 kfree(data);
1840 return error;
1841 }
1842
1843 /*
1844 * Initialise the common bits of the superblock
1845 */
1846 static inline void nfs_initialise_sb(struct super_block *sb)
1847 {
1848 struct nfs_server *server = NFS_SB(sb);
1849
1850 sb->s_magic = NFS_SUPER_MAGIC;
1851
1852 /* We probably want something more informative here */
1853 snprintf(sb->s_id, sizeof(sb->s_id),
1854 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1855
1856 if (sb->s_blocksize == 0)
1857 sb->s_blocksize = nfs_block_bits(server->wsize,
1858 &sb->s_blocksize_bits);
1859
1860 if (server->flags & NFS_MOUNT_NOAC)
1861 sb->s_flags |= MS_SYNCHRONOUS;
1862
1863 nfs_super_set_maxbytes(sb, server->maxfilesize);
1864 }
1865
1866 /*
1867 * Finish setting up an NFS2/3 superblock
1868 */
1869 static void nfs_fill_super(struct super_block *sb,
1870 struct nfs_parsed_mount_data *data)
1871 {
1872 struct nfs_server *server = NFS_SB(sb);
1873
1874 sb->s_blocksize_bits = 0;
1875 sb->s_blocksize = 0;
1876 if (data->bsize)
1877 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1878
1879 if (server->flags & NFS_MOUNT_VER3) {
1880 /* The VFS shouldn't apply the umask to mode bits. We will do
1881 * so ourselves when necessary.
1882 */
1883 sb->s_flags |= MS_POSIXACL;
1884 sb->s_time_gran = 1;
1885 }
1886
1887 sb->s_op = &nfs_sops;
1888 nfs_initialise_sb(sb);
1889 }
1890
1891 /*
1892 * Finish setting up a cloned NFS2/3 superblock
1893 */
1894 static void nfs_clone_super(struct super_block *sb,
1895 const struct super_block *old_sb)
1896 {
1897 struct nfs_server *server = NFS_SB(sb);
1898
1899 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1900 sb->s_blocksize = old_sb->s_blocksize;
1901 sb->s_maxbytes = old_sb->s_maxbytes;
1902
1903 if (server->flags & NFS_MOUNT_VER3) {
1904 /* The VFS shouldn't apply the umask to mode bits. We will do
1905 * so ourselves when necessary.
1906 */
1907 sb->s_flags |= MS_POSIXACL;
1908 sb->s_time_gran = 1;
1909 }
1910
1911 sb->s_op = old_sb->s_op;
1912 nfs_initialise_sb(sb);
1913 }
1914
1915 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1916 {
1917 const struct nfs_server *a = s->s_fs_info;
1918 const struct rpc_clnt *clnt_a = a->client;
1919 const struct rpc_clnt *clnt_b = b->client;
1920
1921 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1922 goto Ebusy;
1923 if (a->nfs_client != b->nfs_client)
1924 goto Ebusy;
1925 if (a->flags != b->flags)
1926 goto Ebusy;
1927 if (a->wsize != b->wsize)
1928 goto Ebusy;
1929 if (a->rsize != b->rsize)
1930 goto Ebusy;
1931 if (a->acregmin != b->acregmin)
1932 goto Ebusy;
1933 if (a->acregmax != b->acregmax)
1934 goto Ebusy;
1935 if (a->acdirmin != b->acdirmin)
1936 goto Ebusy;
1937 if (a->acdirmax != b->acdirmax)
1938 goto Ebusy;
1939 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1940 goto Ebusy;
1941 return 1;
1942 Ebusy:
1943 return 0;
1944 }
1945
1946 struct nfs_sb_mountdata {
1947 struct nfs_server *server;
1948 int mntflags;
1949 };
1950
1951 static int nfs_set_super(struct super_block *s, void *data)
1952 {
1953 struct nfs_sb_mountdata *sb_mntdata = data;
1954 struct nfs_server *server = sb_mntdata->server;
1955 int ret;
1956
1957 s->s_flags = sb_mntdata->mntflags;
1958 s->s_fs_info = server;
1959 ret = set_anon_super(s, server);
1960 if (ret == 0)
1961 server->s_dev = s->s_dev;
1962 return ret;
1963 }
1964
1965 static int nfs_compare_super_address(struct nfs_server *server1,
1966 struct nfs_server *server2)
1967 {
1968 struct sockaddr *sap1, *sap2;
1969
1970 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1971 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1972
1973 if (sap1->sa_family != sap2->sa_family)
1974 return 0;
1975
1976 switch (sap1->sa_family) {
1977 case AF_INET: {
1978 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1979 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1980 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1981 return 0;
1982 if (sin1->sin_port != sin2->sin_port)
1983 return 0;
1984 break;
1985 }
1986 case AF_INET6: {
1987 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1988 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1989 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1990 return 0;
1991 if (sin1->sin6_port != sin2->sin6_port)
1992 return 0;
1993 break;
1994 }
1995 default:
1996 return 0;
1997 }
1998
1999 return 1;
2000 }
2001
2002 static int nfs_compare_super(struct super_block *sb, void *data)
2003 {
2004 struct nfs_sb_mountdata *sb_mntdata = data;
2005 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2006 int mntflags = sb_mntdata->mntflags;
2007
2008 if (!nfs_compare_super_address(old, server))
2009 return 0;
2010 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2011 if (old->flags & NFS_MOUNT_UNSHARED)
2012 return 0;
2013 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2014 return 0;
2015 return nfs_compare_mount_options(sb, server, mntflags);
2016 }
2017
2018 static int nfs_bdi_register(struct nfs_server *server)
2019 {
2020 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2021 }
2022
2023 static int nfs_get_sb(struct file_system_type *fs_type,
2024 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2025 {
2026 struct nfs_server *server = NULL;
2027 struct super_block *s;
2028 struct nfs_parsed_mount_data *data;
2029 struct nfs_fh *mntfh;
2030 struct dentry *mntroot;
2031 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2032 struct nfs_sb_mountdata sb_mntdata = {
2033 .mntflags = flags,
2034 };
2035 int error = -ENOMEM;
2036
2037 data = kzalloc(sizeof(*data), GFP_KERNEL);
2038 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2039 if (data == NULL || mntfh == NULL)
2040 goto out_free_fh;
2041
2042 security_init_mnt_opts(&data->lsm_opts);
2043
2044 /* Validate the mount data */
2045 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2046 if (error < 0)
2047 goto out;
2048
2049 /* Get a volume representation */
2050 server = nfs_create_server(data, mntfh);
2051 if (IS_ERR(server)) {
2052 error = PTR_ERR(server);
2053 goto out;
2054 }
2055 sb_mntdata.server = server;
2056
2057 if (server->flags & NFS_MOUNT_UNSHARED)
2058 compare_super = NULL;
2059
2060 /* Get a superblock - note that we may end up sharing one that already exists */
2061 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2062 if (IS_ERR(s)) {
2063 error = PTR_ERR(s);
2064 goto out_err_nosb;
2065 }
2066
2067 if (s->s_fs_info != server) {
2068 nfs_free_server(server);
2069 server = NULL;
2070 } else {
2071 error = nfs_bdi_register(server);
2072 if (error)
2073 goto error_splat_super;
2074 }
2075
2076 if (!s->s_root) {
2077 /* initial superblock/root creation */
2078 nfs_fill_super(s, data);
2079 nfs_fscache_get_super_cookie(s, data);
2080 }
2081
2082 mntroot = nfs_get_root(s, mntfh);
2083 if (IS_ERR(mntroot)) {
2084 error = PTR_ERR(mntroot);
2085 goto error_splat_super;
2086 }
2087
2088 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2089 if (error)
2090 goto error_splat_root;
2091
2092 s->s_flags |= MS_ACTIVE;
2093 mnt->mnt_sb = s;
2094 mnt->mnt_root = mntroot;
2095 error = 0;
2096
2097 out:
2098 kfree(data->nfs_server.hostname);
2099 kfree(data->mount_server.hostname);
2100 kfree(data->fscache_uniq);
2101 security_free_mnt_opts(&data->lsm_opts);
2102 out_free_fh:
2103 kfree(mntfh);
2104 kfree(data);
2105 return error;
2106
2107 out_err_nosb:
2108 nfs_free_server(server);
2109 goto out;
2110
2111 error_splat_root:
2112 dput(mntroot);
2113 error_splat_super:
2114 deactivate_locked_super(s);
2115 goto out;
2116 }
2117
2118 /*
2119 * Destroy an NFS2/3 superblock
2120 */
2121 static void nfs_kill_super(struct super_block *s)
2122 {
2123 struct nfs_server *server = NFS_SB(s);
2124
2125 bdi_unregister(&server->backing_dev_info);
2126 kill_anon_super(s);
2127 nfs_fscache_release_super_cookie(s);
2128 nfs_free_server(server);
2129 }
2130
2131 /*
2132 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2133 */
2134 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2135 const char *dev_name, void *raw_data,
2136 struct vfsmount *mnt)
2137 {
2138 struct nfs_clone_mount *data = raw_data;
2139 struct super_block *s;
2140 struct nfs_server *server;
2141 struct dentry *mntroot;
2142 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2143 struct nfs_sb_mountdata sb_mntdata = {
2144 .mntflags = flags,
2145 };
2146 int error;
2147
2148 dprintk("--> nfs_xdev_get_sb()\n");
2149
2150 /* create a new volume representation */
2151 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2152 if (IS_ERR(server)) {
2153 error = PTR_ERR(server);
2154 goto out_err_noserver;
2155 }
2156 sb_mntdata.server = server;
2157
2158 if (server->flags & NFS_MOUNT_UNSHARED)
2159 compare_super = NULL;
2160
2161 /* Get a superblock - note that we may end up sharing one that already exists */
2162 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2163 if (IS_ERR(s)) {
2164 error = PTR_ERR(s);
2165 goto out_err_nosb;
2166 }
2167
2168 if (s->s_fs_info != server) {
2169 nfs_free_server(server);
2170 server = NULL;
2171 } else {
2172 error = nfs_bdi_register(server);
2173 if (error)
2174 goto error_splat_super;
2175 }
2176
2177 if (!s->s_root) {
2178 /* initial superblock/root creation */
2179 nfs_clone_super(s, data->sb);
2180 }
2181
2182 mntroot = nfs_get_root(s, data->fh);
2183 if (IS_ERR(mntroot)) {
2184 error = PTR_ERR(mntroot);
2185 goto error_splat_super;
2186 }
2187 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2188 dput(mntroot);
2189 error = -ESTALE;
2190 goto error_splat_super;
2191 }
2192
2193 s->s_flags |= MS_ACTIVE;
2194 mnt->mnt_sb = s;
2195 mnt->mnt_root = mntroot;
2196
2197 /* clone any lsm security options from the parent to the new sb */
2198 security_sb_clone_mnt_opts(data->sb, s);
2199
2200 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2201 return 0;
2202
2203 out_err_nosb:
2204 nfs_free_server(server);
2205 out_err_noserver:
2206 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2207 return error;
2208
2209 error_splat_super:
2210 deactivate_locked_super(s);
2211 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2212 return error;
2213 }
2214
2215 #ifdef CONFIG_NFS_V4
2216
2217 /*
2218 * Finish setting up a cloned NFS4 superblock
2219 */
2220 static void nfs4_clone_super(struct super_block *sb,
2221 const struct super_block *old_sb)
2222 {
2223 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2224 sb->s_blocksize = old_sb->s_blocksize;
2225 sb->s_maxbytes = old_sb->s_maxbytes;
2226 sb->s_time_gran = 1;
2227 sb->s_op = old_sb->s_op;
2228 nfs_initialise_sb(sb);
2229 }
2230
2231 /*
2232 * Set up an NFS4 superblock
2233 */
2234 static void nfs4_fill_super(struct super_block *sb)
2235 {
2236 sb->s_time_gran = 1;
2237 sb->s_op = &nfs4_sops;
2238 nfs_initialise_sb(sb);
2239 }
2240
2241 /*
2242 * Validate NFSv4 mount options
2243 */
2244 static int nfs4_validate_mount_data(void *options,
2245 struct nfs_parsed_mount_data *args,
2246 const char *dev_name)
2247 {
2248 struct sockaddr_in *ap;
2249 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2250 char *c;
2251
2252 if (data == NULL)
2253 goto out_no_data;
2254
2255 args->rsize = NFS_MAX_FILE_IO_SIZE;
2256 args->wsize = NFS_MAX_FILE_IO_SIZE;
2257 args->acregmin = NFS_DEF_ACREGMIN;
2258 args->acregmax = NFS_DEF_ACREGMAX;
2259 args->acdirmin = NFS_DEF_ACDIRMIN;
2260 args->acdirmax = NFS_DEF_ACDIRMAX;
2261 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2262 args->auth_flavors[0] = RPC_AUTH_UNIX;
2263 args->auth_flavor_len = 0;
2264
2265 switch (data->version) {
2266 case 1:
2267 ap = (struct sockaddr_in *)&args->nfs_server.address;
2268 if (data->host_addrlen > sizeof(args->nfs_server.address))
2269 goto out_no_address;
2270 if (data->host_addrlen == 0)
2271 goto out_no_address;
2272 args->nfs_server.addrlen = data->host_addrlen;
2273 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2274 return -EFAULT;
2275 if (!nfs_verify_server_address((struct sockaddr *)
2276 &args->nfs_server.address))
2277 goto out_no_address;
2278
2279 if (data->auth_flavourlen) {
2280 if (data->auth_flavourlen > 1)
2281 goto out_inval_auth;
2282 if (copy_from_user(&args->auth_flavors[0],
2283 data->auth_flavours,
2284 sizeof(args->auth_flavors[0])))
2285 return -EFAULT;
2286 }
2287
2288 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2289 if (IS_ERR(c))
2290 return PTR_ERR(c);
2291 args->nfs_server.hostname = c;
2292
2293 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2294 if (IS_ERR(c))
2295 return PTR_ERR(c);
2296 args->nfs_server.export_path = c;
2297 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2298
2299 c = strndup_user(data->client_addr.data, 16);
2300 if (IS_ERR(c))
2301 return PTR_ERR(c);
2302 args->client_address = c;
2303
2304 /*
2305 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2306 * can deal with.
2307 */
2308
2309 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2310 args->rsize = data->rsize;
2311 args->wsize = data->wsize;
2312 args->timeo = data->timeo;
2313 args->retrans = data->retrans;
2314 args->acregmin = data->acregmin;
2315 args->acregmax = data->acregmax;
2316 args->acdirmin = data->acdirmin;
2317 args->acdirmax = data->acdirmax;
2318 args->nfs_server.protocol = data->proto;
2319 nfs_validate_transport_protocol(args);
2320
2321 break;
2322 default: {
2323 int status;
2324
2325 if (nfs_parse_mount_options((char *)options, args) == 0)
2326 return -EINVAL;
2327
2328 if (!nfs_verify_server_address((struct sockaddr *)
2329 &args->nfs_server.address))
2330 return -EINVAL;
2331
2332 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2333 args->nfs_server.port);
2334
2335 nfs_validate_transport_protocol(args);
2336
2337 if (args->auth_flavor_len > 1)
2338 goto out_inval_auth;
2339
2340 if (args->client_address == NULL)
2341 goto out_no_client_address;
2342
2343 status = nfs_parse_devname(dev_name,
2344 &args->nfs_server.hostname,
2345 NFS4_MAXNAMLEN,
2346 &args->nfs_server.export_path,
2347 NFS4_MAXPATHLEN);
2348 if (status < 0)
2349 return status;
2350
2351 break;
2352 }
2353 }
2354
2355 return 0;
2356
2357 out_no_data:
2358 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2359 return -EINVAL;
2360
2361 out_inval_auth:
2362 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2363 data->auth_flavourlen);
2364 return -EINVAL;
2365
2366 out_no_address:
2367 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2368 return -EINVAL;
2369
2370 out_no_client_address:
2371 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2372 return -EINVAL;
2373 }
2374
2375 /*
2376 * Get the superblock for an NFS4 mountpoint
2377 */
2378 static int nfs4_get_sb(struct file_system_type *fs_type,
2379 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2380 {
2381 struct nfs_parsed_mount_data *data;
2382 struct super_block *s;
2383 struct nfs_server *server;
2384 struct nfs_fh *mntfh;
2385 struct dentry *mntroot;
2386 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2387 struct nfs_sb_mountdata sb_mntdata = {
2388 .mntflags = flags,
2389 };
2390 int error = -ENOMEM;
2391
2392 data = kzalloc(sizeof(*data), GFP_KERNEL);
2393 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2394 if (data == NULL || mntfh == NULL)
2395 goto out_free_fh;
2396
2397 security_init_mnt_opts(&data->lsm_opts);
2398
2399 /* Validate the mount data */
2400 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2401 if (error < 0)
2402 goto out;
2403
2404 /* Get a volume representation */
2405 server = nfs4_create_server(data, mntfh);
2406 if (IS_ERR(server)) {
2407 error = PTR_ERR(server);
2408 goto out;
2409 }
2410 sb_mntdata.server = server;
2411
2412 if (server->flags & NFS4_MOUNT_UNSHARED)
2413 compare_super = NULL;
2414
2415 /* Get a superblock - note that we may end up sharing one that already exists */
2416 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2417 if (IS_ERR(s)) {
2418 error = PTR_ERR(s);
2419 goto out_free;
2420 }
2421
2422 if (s->s_fs_info != server) {
2423 nfs_free_server(server);
2424 server = NULL;
2425 } else {
2426 error = nfs_bdi_register(server);
2427 if (error)
2428 goto error_splat_super;
2429 }
2430
2431 if (!s->s_root) {
2432 /* initial superblock/root creation */
2433 nfs4_fill_super(s);
2434 nfs_fscache_get_super_cookie(s, data);
2435 }
2436
2437 mntroot = nfs4_get_root(s, mntfh);
2438 if (IS_ERR(mntroot)) {
2439 error = PTR_ERR(mntroot);
2440 goto error_splat_super;
2441 }
2442
2443 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2444 if (error)
2445 goto error_splat_root;
2446
2447 s->s_flags |= MS_ACTIVE;
2448 mnt->mnt_sb = s;
2449 mnt->mnt_root = mntroot;
2450 error = 0;
2451
2452 out:
2453 kfree(data->client_address);
2454 kfree(data->nfs_server.export_path);
2455 kfree(data->nfs_server.hostname);
2456 kfree(data->fscache_uniq);
2457 security_free_mnt_opts(&data->lsm_opts);
2458 out_free_fh:
2459 kfree(mntfh);
2460 kfree(data);
2461 return error;
2462
2463 out_free:
2464 nfs_free_server(server);
2465 goto out;
2466
2467 error_splat_root:
2468 dput(mntroot);
2469 error_splat_super:
2470 deactivate_locked_super(s);
2471 goto out;
2472 }
2473
2474 static void nfs4_kill_super(struct super_block *sb)
2475 {
2476 struct nfs_server *server = NFS_SB(sb);
2477
2478 nfs_super_return_all_delegations(sb);
2479 kill_anon_super(sb);
2480
2481 nfs4_renewd_prepare_shutdown(server);
2482 nfs_fscache_release_super_cookie(sb);
2483 nfs_free_server(server);
2484 }
2485
2486 /*
2487 * Clone an NFS4 server record on xdev traversal (FSID-change)
2488 */
2489 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2490 const char *dev_name, void *raw_data,
2491 struct vfsmount *mnt)
2492 {
2493 struct nfs_clone_mount *data = raw_data;
2494 struct super_block *s;
2495 struct nfs_server *server;
2496 struct dentry *mntroot;
2497 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2498 struct nfs_sb_mountdata sb_mntdata = {
2499 .mntflags = flags,
2500 };
2501 int error;
2502
2503 dprintk("--> nfs4_xdev_get_sb()\n");
2504
2505 /* create a new volume representation */
2506 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2507 if (IS_ERR(server)) {
2508 error = PTR_ERR(server);
2509 goto out_err_noserver;
2510 }
2511 sb_mntdata.server = server;
2512
2513 if (server->flags & NFS4_MOUNT_UNSHARED)
2514 compare_super = NULL;
2515
2516 /* Get a superblock - note that we may end up sharing one that already exists */
2517 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2518 if (IS_ERR(s)) {
2519 error = PTR_ERR(s);
2520 goto out_err_nosb;
2521 }
2522
2523 if (s->s_fs_info != server) {
2524 nfs_free_server(server);
2525 server = NULL;
2526 } else {
2527 error = nfs_bdi_register(server);
2528 if (error)
2529 goto error_splat_super;
2530 }
2531
2532 if (!s->s_root) {
2533 /* initial superblock/root creation */
2534 nfs4_clone_super(s, data->sb);
2535 }
2536
2537 mntroot = nfs4_get_root(s, data->fh);
2538 if (IS_ERR(mntroot)) {
2539 error = PTR_ERR(mntroot);
2540 goto error_splat_super;
2541 }
2542 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2543 dput(mntroot);
2544 error = -ESTALE;
2545 goto error_splat_super;
2546 }
2547
2548 s->s_flags |= MS_ACTIVE;
2549 mnt->mnt_sb = s;
2550 mnt->mnt_root = mntroot;
2551
2552 security_sb_clone_mnt_opts(data->sb, s);
2553
2554 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2555 return 0;
2556
2557 out_err_nosb:
2558 nfs_free_server(server);
2559 out_err_noserver:
2560 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2561 return error;
2562
2563 error_splat_super:
2564 deactivate_locked_super(s);
2565 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2566 return error;
2567 }
2568
2569 /*
2570 * Create an NFS4 server record on referral traversal
2571 */
2572 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2573 const char *dev_name, void *raw_data,
2574 struct vfsmount *mnt)
2575 {
2576 struct nfs_clone_mount *data = raw_data;
2577 struct super_block *s;
2578 struct nfs_server *server;
2579 struct dentry *mntroot;
2580 struct nfs_fh mntfh;
2581 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2582 struct nfs_sb_mountdata sb_mntdata = {
2583 .mntflags = flags,
2584 };
2585 int error;
2586
2587 dprintk("--> nfs4_referral_get_sb()\n");
2588
2589 /* create a new volume representation */
2590 server = nfs4_create_referral_server(data, &mntfh);
2591 if (IS_ERR(server)) {
2592 error = PTR_ERR(server);
2593 goto out_err_noserver;
2594 }
2595 sb_mntdata.server = server;
2596
2597 if (server->flags & NFS4_MOUNT_UNSHARED)
2598 compare_super = NULL;
2599
2600 /* Get a superblock - note that we may end up sharing one that already exists */
2601 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2602 if (IS_ERR(s)) {
2603 error = PTR_ERR(s);
2604 goto out_err_nosb;
2605 }
2606
2607 if (s->s_fs_info != server) {
2608 nfs_free_server(server);
2609 server = NULL;
2610 } else {
2611 error = nfs_bdi_register(server);
2612 if (error)
2613 goto error_splat_super;
2614 }
2615
2616 if (!s->s_root) {
2617 /* initial superblock/root creation */
2618 nfs4_fill_super(s);
2619 }
2620
2621 mntroot = nfs4_get_root(s, &mntfh);
2622 if (IS_ERR(mntroot)) {
2623 error = PTR_ERR(mntroot);
2624 goto error_splat_super;
2625 }
2626 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2627 dput(mntroot);
2628 error = -ESTALE;
2629 goto error_splat_super;
2630 }
2631
2632 s->s_flags |= MS_ACTIVE;
2633 mnt->mnt_sb = s;
2634 mnt->mnt_root = mntroot;
2635
2636 security_sb_clone_mnt_opts(data->sb, s);
2637
2638 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2639 return 0;
2640
2641 out_err_nosb:
2642 nfs_free_server(server);
2643 out_err_noserver:
2644 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2645 return error;
2646
2647 error_splat_super:
2648 deactivate_locked_super(s);
2649 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2650 return error;
2651 }
2652
2653 #endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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