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SUNRPC: Use only rpcbind v2 for AF_INET requests
[mirror_ubuntu-artful-kernel.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.Cox@linux.org>, 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
64 #define NFSDBG_FACILITY NFSDBG_VFS
65
66 enum {
67 /* Mount options that take no arguments */
68 Opt_soft, Opt_hard,
69 Opt_posix, Opt_noposix,
70 Opt_cto, Opt_nocto,
71 Opt_ac, Opt_noac,
72 Opt_lock, Opt_nolock,
73 Opt_v2, Opt_v3,
74 Opt_udp, Opt_tcp, Opt_rdma,
75 Opt_acl, Opt_noacl,
76 Opt_rdirplus, Opt_nordirplus,
77 Opt_sharecache, Opt_nosharecache,
78
79 /* Mount options that take integer arguments */
80 Opt_port,
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
85 Opt_actimeo,
86 Opt_namelen,
87 Opt_mountport,
88 Opt_mountvers,
89 Opt_nfsvers,
90
91 /* Mount options that take string arguments */
92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
94
95 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
97
98 Opt_err
99 };
100
101 static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_userspace, "retry=%s" },
105
106 { Opt_soft, "soft" },
107 { Opt_hard, "hard" },
108 { Opt_deprecated, "intr" },
109 { Opt_deprecated, "nointr" },
110 { Opt_posix, "posix" },
111 { Opt_noposix, "noposix" },
112 { Opt_cto, "cto" },
113 { Opt_nocto, "nocto" },
114 { Opt_ac, "ac" },
115 { Opt_noac, "noac" },
116 { Opt_lock, "lock" },
117 { Opt_nolock, "nolock" },
118 { Opt_v2, "v2" },
119 { Opt_v3, "v3" },
120 { Opt_udp, "udp" },
121 { Opt_tcp, "tcp" },
122 { Opt_rdma, "rdma" },
123 { Opt_acl, "acl" },
124 { Opt_noacl, "noacl" },
125 { Opt_rdirplus, "rdirplus" },
126 { Opt_nordirplus, "nordirplus" },
127 { Opt_sharecache, "sharecache" },
128 { Opt_nosharecache, "nosharecache" },
129
130 { Opt_port, "port=%u" },
131 { Opt_rsize, "rsize=%u" },
132 { Opt_wsize, "wsize=%u" },
133 { Opt_bsize, "bsize=%u" },
134 { Opt_timeo, "timeo=%u" },
135 { Opt_retrans, "retrans=%u" },
136 { Opt_acregmin, "acregmin=%u" },
137 { Opt_acregmax, "acregmax=%u" },
138 { Opt_acdirmin, "acdirmin=%u" },
139 { Opt_acdirmax, "acdirmax=%u" },
140 { Opt_actimeo, "actimeo=%u" },
141 { Opt_namelen, "namlen=%u" },
142 { Opt_mountport, "mountport=%u" },
143 { Opt_mountvers, "mountvers=%u" },
144 { Opt_nfsvers, "nfsvers=%u" },
145 { Opt_nfsvers, "vers=%u" },
146
147 { Opt_sec, "sec=%s" },
148 { Opt_proto, "proto=%s" },
149 { Opt_mountproto, "mountproto=%s" },
150 { Opt_addr, "addr=%s" },
151 { Opt_clientaddr, "clientaddr=%s" },
152 { Opt_mounthost, "mounthost=%s" },
153 { Opt_mountaddr, "mountaddr=%s" },
154
155 { Opt_err, NULL }
156 };
157
158 enum {
159 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
160
161 Opt_xprt_err
162 };
163
164 static match_table_t nfs_xprt_protocol_tokens = {
165 { Opt_xprt_udp, "udp" },
166 { Opt_xprt_tcp, "tcp" },
167 { Opt_xprt_rdma, "rdma" },
168
169 { Opt_xprt_err, NULL }
170 };
171
172 enum {
173 Opt_sec_none, Opt_sec_sys,
174 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
175 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
176 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
177
178 Opt_sec_err
179 };
180
181 static match_table_t nfs_secflavor_tokens = {
182 { Opt_sec_none, "none" },
183 { Opt_sec_none, "null" },
184 { Opt_sec_sys, "sys" },
185
186 { Opt_sec_krb5, "krb5" },
187 { Opt_sec_krb5i, "krb5i" },
188 { Opt_sec_krb5p, "krb5p" },
189
190 { Opt_sec_lkey, "lkey" },
191 { Opt_sec_lkeyi, "lkeyi" },
192 { Opt_sec_lkeyp, "lkeyp" },
193
194 { Opt_sec_spkm, "spkm3" },
195 { Opt_sec_spkmi, "spkm3i" },
196 { Opt_sec_spkmp, "spkm3p" },
197
198 { Opt_sec_err, NULL }
199 };
200
201
202 static void nfs_umount_begin(struct super_block *);
203 static int nfs_statfs(struct dentry *, struct kstatfs *);
204 static int nfs_show_options(struct seq_file *, struct vfsmount *);
205 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
206 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
207 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
208 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
209 static void nfs_kill_super(struct super_block *);
210 static void nfs_put_super(struct super_block *);
211 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
212
213 static struct file_system_type nfs_fs_type = {
214 .owner = THIS_MODULE,
215 .name = "nfs",
216 .get_sb = nfs_get_sb,
217 .kill_sb = nfs_kill_super,
218 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
219 };
220
221 struct file_system_type nfs_xdev_fs_type = {
222 .owner = THIS_MODULE,
223 .name = "nfs",
224 .get_sb = nfs_xdev_get_sb,
225 .kill_sb = nfs_kill_super,
226 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
227 };
228
229 static const struct super_operations nfs_sops = {
230 .alloc_inode = nfs_alloc_inode,
231 .destroy_inode = nfs_destroy_inode,
232 .write_inode = nfs_write_inode,
233 .put_super = nfs_put_super,
234 .statfs = nfs_statfs,
235 .clear_inode = nfs_clear_inode,
236 .umount_begin = nfs_umount_begin,
237 .show_options = nfs_show_options,
238 .show_stats = nfs_show_stats,
239 .remount_fs = nfs_remount,
240 };
241
242 #ifdef CONFIG_NFS_V4
243 static int nfs4_get_sb(struct file_system_type *fs_type,
244 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
245 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
247 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
248 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
249 static void nfs4_kill_super(struct super_block *sb);
250
251 static struct file_system_type nfs4_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs4",
254 .get_sb = nfs4_get_sb,
255 .kill_sb = nfs4_kill_super,
256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
257 };
258
259 struct file_system_type nfs4_xdev_fs_type = {
260 .owner = THIS_MODULE,
261 .name = "nfs4",
262 .get_sb = nfs4_xdev_get_sb,
263 .kill_sb = nfs4_kill_super,
264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
265 };
266
267 struct file_system_type nfs4_referral_fs_type = {
268 .owner = THIS_MODULE,
269 .name = "nfs4",
270 .get_sb = nfs4_referral_get_sb,
271 .kill_sb = nfs4_kill_super,
272 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
273 };
274
275 static const struct super_operations nfs4_sops = {
276 .alloc_inode = nfs_alloc_inode,
277 .destroy_inode = nfs_destroy_inode,
278 .write_inode = nfs_write_inode,
279 .statfs = nfs_statfs,
280 .clear_inode = nfs4_clear_inode,
281 .umount_begin = nfs_umount_begin,
282 .show_options = nfs_show_options,
283 .show_stats = nfs_show_stats,
284 .remount_fs = nfs_remount,
285 };
286 #endif
287
288 static struct shrinker acl_shrinker = {
289 .shrink = nfs_access_cache_shrinker,
290 .seeks = DEFAULT_SEEKS,
291 };
292
293 /*
294 * Register the NFS filesystems
295 */
296 int __init register_nfs_fs(void)
297 {
298 int ret;
299
300 ret = register_filesystem(&nfs_fs_type);
301 if (ret < 0)
302 goto error_0;
303
304 ret = nfs_register_sysctl();
305 if (ret < 0)
306 goto error_1;
307 #ifdef CONFIG_NFS_V4
308 ret = register_filesystem(&nfs4_fs_type);
309 if (ret < 0)
310 goto error_2;
311 #endif
312 register_shrinker(&acl_shrinker);
313 return 0;
314
315 #ifdef CONFIG_NFS_V4
316 error_2:
317 nfs_unregister_sysctl();
318 #endif
319 error_1:
320 unregister_filesystem(&nfs_fs_type);
321 error_0:
322 return ret;
323 }
324
325 /*
326 * Unregister the NFS filesystems
327 */
328 void __exit unregister_nfs_fs(void)
329 {
330 unregister_shrinker(&acl_shrinker);
331 #ifdef CONFIG_NFS_V4
332 unregister_filesystem(&nfs4_fs_type);
333 #endif
334 nfs_unregister_sysctl();
335 unregister_filesystem(&nfs_fs_type);
336 }
337
338 void nfs_sb_active(struct nfs_server *server)
339 {
340 atomic_inc(&server->active);
341 }
342
343 void nfs_sb_deactive(struct nfs_server *server)
344 {
345 if (atomic_dec_and_test(&server->active))
346 wake_up(&server->active_wq);
347 }
348
349 static void nfs_put_super(struct super_block *sb)
350 {
351 struct nfs_server *server = NFS_SB(sb);
352 /*
353 * Make sure there are no outstanding ops to this server.
354 * If so, wait for them to finish before allowing the
355 * unmount to continue.
356 */
357 wait_event(server->active_wq, atomic_read(&server->active) == 0);
358 }
359
360 /*
361 * Deliver file system statistics to userspace
362 */
363 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
364 {
365 struct nfs_server *server = NFS_SB(dentry->d_sb);
366 unsigned char blockbits;
367 unsigned long blockres;
368 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
369 struct nfs_fattr fattr;
370 struct nfs_fsstat res = {
371 .fattr = &fattr,
372 };
373 int error;
374
375 lock_kernel();
376
377 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
378 if (error < 0)
379 goto out_err;
380 buf->f_type = NFS_SUPER_MAGIC;
381
382 /*
383 * Current versions of glibc do not correctly handle the
384 * case where f_frsize != f_bsize. Eventually we want to
385 * report the value of wtmult in this field.
386 */
387 buf->f_frsize = dentry->d_sb->s_blocksize;
388
389 /*
390 * On most *nix systems, f_blocks, f_bfree, and f_bavail
391 * are reported in units of f_frsize. Linux hasn't had
392 * an f_frsize field in its statfs struct until recently,
393 * thus historically Linux's sys_statfs reports these
394 * fields in units of f_bsize.
395 */
396 buf->f_bsize = dentry->d_sb->s_blocksize;
397 blockbits = dentry->d_sb->s_blocksize_bits;
398 blockres = (1 << blockbits) - 1;
399 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
400 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
401 buf->f_bavail = (res.abytes + blockres) >> blockbits;
402
403 buf->f_files = res.tfiles;
404 buf->f_ffree = res.afiles;
405
406 buf->f_namelen = server->namelen;
407
408 unlock_kernel();
409 return 0;
410
411 out_err:
412 dprintk("%s: statfs error = %d\n", __func__, -error);
413 unlock_kernel();
414 return error;
415 }
416
417 /*
418 * Map the security flavour number to a name
419 */
420 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
421 {
422 static const struct {
423 rpc_authflavor_t flavour;
424 const char *str;
425 } sec_flavours[] = {
426 { RPC_AUTH_NULL, "null" },
427 { RPC_AUTH_UNIX, "sys" },
428 { RPC_AUTH_GSS_KRB5, "krb5" },
429 { RPC_AUTH_GSS_KRB5I, "krb5i" },
430 { RPC_AUTH_GSS_KRB5P, "krb5p" },
431 { RPC_AUTH_GSS_LKEY, "lkey" },
432 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
433 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
434 { RPC_AUTH_GSS_SPKM, "spkm" },
435 { RPC_AUTH_GSS_SPKMI, "spkmi" },
436 { RPC_AUTH_GSS_SPKMP, "spkmp" },
437 { UINT_MAX, "unknown" }
438 };
439 int i;
440
441 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
442 if (sec_flavours[i].flavour == flavour)
443 break;
444 }
445 return sec_flavours[i].str;
446 }
447
448 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
449 int showdefaults)
450 {
451 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
452
453 switch (sap->sa_family) {
454 case AF_INET: {
455 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
456 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
457 NIPQUAD(sin->sin_addr.s_addr));
458 break;
459 }
460 case AF_INET6: {
461 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
462 seq_printf(m, ",mountaddr=" NIP6_FMT,
463 NIP6(sin6->sin6_addr));
464 break;
465 }
466 default:
467 if (showdefaults)
468 seq_printf(m, ",mountaddr=unspecified");
469 }
470
471 if (nfss->mountd_version || showdefaults)
472 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
473 if (nfss->mountd_port || showdefaults)
474 seq_printf(m, ",mountport=%u", nfss->mountd_port);
475
476 switch (nfss->mountd_protocol) {
477 case IPPROTO_UDP:
478 seq_printf(m, ",mountproto=udp");
479 break;
480 case IPPROTO_TCP:
481 seq_printf(m, ",mountproto=tcp");
482 break;
483 default:
484 if (showdefaults)
485 seq_printf(m, ",mountproto=auto");
486 }
487 }
488
489 /*
490 * Describe the mount options in force on this server representation
491 */
492 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
493 int showdefaults)
494 {
495 static const struct proc_nfs_info {
496 int flag;
497 const char *str;
498 const char *nostr;
499 } nfs_info[] = {
500 { NFS_MOUNT_SOFT, ",soft", ",hard" },
501 { NFS_MOUNT_INTR, ",intr", ",nointr" },
502 { NFS_MOUNT_POSIX, ",posix", "" },
503 { NFS_MOUNT_NOCTO, ",nocto", "" },
504 { NFS_MOUNT_NOAC, ",noac", "" },
505 { NFS_MOUNT_NONLM, ",nolock", "" },
506 { NFS_MOUNT_NOACL, ",noacl", "" },
507 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
508 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
509 { 0, NULL, NULL }
510 };
511 const struct proc_nfs_info *nfs_infop;
512 struct nfs_client *clp = nfss->nfs_client;
513 u32 version = clp->rpc_ops->version;
514
515 seq_printf(m, ",vers=%u", version);
516 seq_printf(m, ",rsize=%u", nfss->rsize);
517 seq_printf(m, ",wsize=%u", nfss->wsize);
518 if (nfss->bsize != 0)
519 seq_printf(m, ",bsize=%u", nfss->bsize);
520 seq_printf(m, ",namlen=%u", nfss->namelen);
521 if (nfss->acregmin != 3*HZ || showdefaults)
522 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
523 if (nfss->acregmax != 60*HZ || showdefaults)
524 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
525 if (nfss->acdirmin != 30*HZ || showdefaults)
526 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
527 if (nfss->acdirmax != 60*HZ || showdefaults)
528 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
529 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
530 if (nfss->flags & nfs_infop->flag)
531 seq_puts(m, nfs_infop->str);
532 else
533 seq_puts(m, nfs_infop->nostr);
534 }
535 seq_printf(m, ",proto=%s",
536 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
537 if (version == 4) {
538 if (nfss->port != NFS_PORT)
539 seq_printf(m, ",port=%u", nfss->port);
540 } else
541 if (nfss->port)
542 seq_printf(m, ",port=%u", nfss->port);
543
544 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
545 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
546 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
547
548 if (version != 4)
549 nfs_show_mountd_options(m, nfss, showdefaults);
550
551 #ifdef CONFIG_NFS_V4
552 if (clp->rpc_ops->version == 4)
553 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
554 #endif
555 }
556
557 /*
558 * Describe the mount options on this VFS mountpoint
559 */
560 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
561 {
562 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
563
564 nfs_show_mount_options(m, nfss, 0);
565
566 seq_printf(m, ",addr=%s",
567 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
568 RPC_DISPLAY_ADDR));
569
570 return 0;
571 }
572
573 /*
574 * Present statistical information for this VFS mountpoint
575 */
576 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
577 {
578 int i, cpu;
579 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
580 struct rpc_auth *auth = nfss->client->cl_auth;
581 struct nfs_iostats totals = { };
582
583 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
584
585 /*
586 * Display all mount option settings
587 */
588 seq_printf(m, "\n\topts:\t");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
592 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
593 nfs_show_mount_options(m, nfss, 1);
594
595 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
596
597 seq_printf(m, "\n\tcaps:\t");
598 seq_printf(m, "caps=0x%x", nfss->caps);
599 seq_printf(m, ",wtmult=%u", nfss->wtmult);
600 seq_printf(m, ",dtsize=%u", nfss->dtsize);
601 seq_printf(m, ",bsize=%u", nfss->bsize);
602 seq_printf(m, ",namlen=%u", nfss->namelen);
603
604 #ifdef CONFIG_NFS_V4
605 if (nfss->nfs_client->rpc_ops->version == 4) {
606 seq_printf(m, "\n\tnfsv4:\t");
607 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
608 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
609 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
610 }
611 #endif
612
613 /*
614 * Display security flavor in effect for this mount
615 */
616 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
617 if (auth->au_flavor)
618 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
619
620 /*
621 * Display superblock I/O counters
622 */
623 for_each_possible_cpu(cpu) {
624 struct nfs_iostats *stats;
625
626 preempt_disable();
627 stats = per_cpu_ptr(nfss->io_stats, cpu);
628
629 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
630 totals.events[i] += stats->events[i];
631 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
632 totals.bytes[i] += stats->bytes[i];
633
634 preempt_enable();
635 }
636
637 seq_printf(m, "\n\tevents:\t");
638 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
639 seq_printf(m, "%lu ", totals.events[i]);
640 seq_printf(m, "\n\tbytes:\t");
641 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
642 seq_printf(m, "%Lu ", totals.bytes[i]);
643 seq_printf(m, "\n");
644
645 rpc_print_iostats(m, nfss->client);
646
647 return 0;
648 }
649
650 /*
651 * Begin unmount by attempting to remove all automounted mountpoints we added
652 * in response to xdev traversals and referrals
653 */
654 static void nfs_umount_begin(struct super_block *sb)
655 {
656 struct nfs_server *server = NFS_SB(sb);
657 struct rpc_clnt *rpc;
658
659 /* -EIO all pending I/O */
660 rpc = server->client_acl;
661 if (!IS_ERR(rpc))
662 rpc_killall_tasks(rpc);
663 rpc = server->client;
664 if (!IS_ERR(rpc))
665 rpc_killall_tasks(rpc);
666 }
667
668 /*
669 * Set the port number in an address. Be agnostic about the address family.
670 */
671 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
672 {
673 switch (sap->sa_family) {
674 case AF_INET: {
675 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
676 ap->sin_port = htons(port);
677 break;
678 }
679 case AF_INET6: {
680 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
681 ap->sin6_port = htons(port);
682 break;
683 }
684 }
685 }
686
687 /*
688 * Sanity-check a server address provided by the mount command.
689 *
690 * Address family must be initialized, and address must not be
691 * the ANY address for that family.
692 */
693 static int nfs_verify_server_address(struct sockaddr *addr)
694 {
695 switch (addr->sa_family) {
696 case AF_INET: {
697 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
698 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
699 }
700 case AF_INET6: {
701 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
702 return !ipv6_addr_any(sa);
703 }
704 }
705
706 return 0;
707 }
708
709 static void nfs_parse_ipv4_address(char *string, size_t str_len,
710 struct sockaddr *sap, size_t *addr_len)
711 {
712 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
713 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
714
715 if (str_len <= INET_ADDRSTRLEN) {
716 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
717 (int)str_len, string);
718
719 sin->sin_family = AF_INET;
720 *addr_len = sizeof(*sin);
721 if (in4_pton(string, str_len, addr, '\0', NULL))
722 return;
723 }
724
725 sap->sa_family = AF_UNSPEC;
726 *addr_len = 0;
727 }
728
729 #define IPV6_SCOPE_DELIMITER '%'
730
731 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
732 static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
733 const char *delim,
734 struct sockaddr_in6 *sin6)
735 {
736 char *p;
737 size_t len;
738
739 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
740 return ;
741 if (*delim != IPV6_SCOPE_DELIMITER)
742 return;
743
744 len = (string + str_len) - delim - 1;
745 p = kstrndup(delim + 1, len, GFP_KERNEL);
746 if (p) {
747 unsigned long scope_id = 0;
748 struct net_device *dev;
749
750 dev = dev_get_by_name(&init_net, p);
751 if (dev != NULL) {
752 scope_id = dev->ifindex;
753 dev_put(dev);
754 } else {
755 /* scope_id is set to zero on error */
756 strict_strtoul(p, 10, &scope_id);
757 }
758
759 kfree(p);
760 sin6->sin6_scope_id = scope_id;
761 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
762 }
763 }
764
765 static void nfs_parse_ipv6_address(char *string, size_t str_len,
766 struct sockaddr *sap, size_t *addr_len)
767 {
768 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
769 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
770 const char *delim;
771
772 if (str_len <= INET6_ADDRSTRLEN) {
773 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
774 (int)str_len, string);
775
776 sin6->sin6_family = AF_INET6;
777 *addr_len = sizeof(*sin6);
778 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
779 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
780 return;
781 }
782 }
783
784 sap->sa_family = AF_UNSPEC;
785 *addr_len = 0;
786 }
787 #else
788 static void nfs_parse_ipv6_address(char *string, size_t str_len,
789 struct sockaddr *sap, size_t *addr_len)
790 {
791 sap->sa_family = AF_UNSPEC;
792 *addr_len = 0;
793 }
794 #endif
795
796 /*
797 * Construct a sockaddr based on the contents of a string that contains
798 * an IP address in presentation format.
799 *
800 * If there is a problem constructing the new sockaddr, set the address
801 * family to AF_UNSPEC.
802 */
803 static void nfs_parse_ip_address(char *string, size_t str_len,
804 struct sockaddr *sap, size_t *addr_len)
805 {
806 unsigned int i, colons;
807
808 colons = 0;
809 for (i = 0; i < str_len; i++)
810 if (string[i] == ':')
811 colons++;
812
813 if (colons >= 2)
814 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
815 else
816 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
817 }
818
819 /*
820 * Error-check and convert a string of mount options from user space into
821 * a data structure
822 */
823 static int nfs_parse_mount_options(char *raw,
824 struct nfs_parsed_mount_data *mnt)
825 {
826 char *p, *string, *secdata;
827 int rc;
828
829 if (!raw) {
830 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
831 return 1;
832 }
833 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
834
835 secdata = alloc_secdata();
836 if (!secdata)
837 goto out_nomem;
838
839 rc = security_sb_copy_data(raw, secdata);
840 if (rc)
841 goto out_security_failure;
842
843 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
844 if (rc)
845 goto out_security_failure;
846
847 free_secdata(secdata);
848
849 while ((p = strsep(&raw, ",")) != NULL) {
850 substring_t args[MAX_OPT_ARGS];
851 int option, token;
852
853 if (!*p)
854 continue;
855
856 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
857
858 token = match_token(p, nfs_mount_option_tokens, args);
859 switch (token) {
860 case Opt_soft:
861 mnt->flags |= NFS_MOUNT_SOFT;
862 break;
863 case Opt_hard:
864 mnt->flags &= ~NFS_MOUNT_SOFT;
865 break;
866 case Opt_posix:
867 mnt->flags |= NFS_MOUNT_POSIX;
868 break;
869 case Opt_noposix:
870 mnt->flags &= ~NFS_MOUNT_POSIX;
871 break;
872 case Opt_cto:
873 mnt->flags &= ~NFS_MOUNT_NOCTO;
874 break;
875 case Opt_nocto:
876 mnt->flags |= NFS_MOUNT_NOCTO;
877 break;
878 case Opt_ac:
879 mnt->flags &= ~NFS_MOUNT_NOAC;
880 break;
881 case Opt_noac:
882 mnt->flags |= NFS_MOUNT_NOAC;
883 break;
884 case Opt_lock:
885 mnt->flags &= ~NFS_MOUNT_NONLM;
886 break;
887 case Opt_nolock:
888 mnt->flags |= NFS_MOUNT_NONLM;
889 break;
890 case Opt_v2:
891 mnt->flags &= ~NFS_MOUNT_VER3;
892 break;
893 case Opt_v3:
894 mnt->flags |= NFS_MOUNT_VER3;
895 break;
896 case Opt_udp:
897 mnt->flags &= ~NFS_MOUNT_TCP;
898 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
899 mnt->timeo = 7;
900 mnt->retrans = 5;
901 break;
902 case Opt_tcp:
903 mnt->flags |= NFS_MOUNT_TCP;
904 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
905 mnt->timeo = 600;
906 mnt->retrans = 2;
907 break;
908 case Opt_rdma:
909 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
910 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
911 mnt->timeo = 600;
912 mnt->retrans = 2;
913 break;
914 case Opt_acl:
915 mnt->flags &= ~NFS_MOUNT_NOACL;
916 break;
917 case Opt_noacl:
918 mnt->flags |= NFS_MOUNT_NOACL;
919 break;
920 case Opt_rdirplus:
921 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
922 break;
923 case Opt_nordirplus:
924 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
925 break;
926 case Opt_sharecache:
927 mnt->flags &= ~NFS_MOUNT_UNSHARED;
928 break;
929 case Opt_nosharecache:
930 mnt->flags |= NFS_MOUNT_UNSHARED;
931 break;
932
933 case Opt_port:
934 if (match_int(args, &option))
935 return 0;
936 if (option < 0 || option > 65535)
937 return 0;
938 mnt->nfs_server.port = option;
939 break;
940 case Opt_rsize:
941 if (match_int(args, &mnt->rsize))
942 return 0;
943 break;
944 case Opt_wsize:
945 if (match_int(args, &mnt->wsize))
946 return 0;
947 break;
948 case Opt_bsize:
949 if (match_int(args, &option))
950 return 0;
951 if (option < 0)
952 return 0;
953 mnt->bsize = option;
954 break;
955 case Opt_timeo:
956 if (match_int(args, &mnt->timeo))
957 return 0;
958 break;
959 case Opt_retrans:
960 if (match_int(args, &mnt->retrans))
961 return 0;
962 break;
963 case Opt_acregmin:
964 if (match_int(args, &mnt->acregmin))
965 return 0;
966 break;
967 case Opt_acregmax:
968 if (match_int(args, &mnt->acregmax))
969 return 0;
970 break;
971 case Opt_acdirmin:
972 if (match_int(args, &mnt->acdirmin))
973 return 0;
974 break;
975 case Opt_acdirmax:
976 if (match_int(args, &mnt->acdirmax))
977 return 0;
978 break;
979 case Opt_actimeo:
980 if (match_int(args, &option))
981 return 0;
982 if (option < 0)
983 return 0;
984 mnt->acregmin =
985 mnt->acregmax =
986 mnt->acdirmin =
987 mnt->acdirmax = option;
988 break;
989 case Opt_namelen:
990 if (match_int(args, &mnt->namlen))
991 return 0;
992 break;
993 case Opt_mountport:
994 if (match_int(args, &option))
995 return 0;
996 if (option < 0 || option > 65535)
997 return 0;
998 mnt->mount_server.port = option;
999 break;
1000 case Opt_mountvers:
1001 if (match_int(args, &option))
1002 return 0;
1003 if (option < 0)
1004 return 0;
1005 mnt->mount_server.version = option;
1006 break;
1007 case Opt_nfsvers:
1008 if (match_int(args, &option))
1009 return 0;
1010 switch (option) {
1011 case 2:
1012 mnt->flags &= ~NFS_MOUNT_VER3;
1013 break;
1014 case 3:
1015 mnt->flags |= NFS_MOUNT_VER3;
1016 break;
1017 default:
1018 goto out_unrec_vers;
1019 }
1020 break;
1021
1022 case Opt_sec:
1023 string = match_strdup(args);
1024 if (string == NULL)
1025 goto out_nomem;
1026 token = match_token(string, nfs_secflavor_tokens, args);
1027 kfree(string);
1028
1029 /*
1030 * The flags setting is for v2/v3. The flavor_len
1031 * setting is for v4. v2/v3 also need to know the
1032 * difference between NULL and UNIX.
1033 */
1034 switch (token) {
1035 case Opt_sec_none:
1036 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
1037 mnt->auth_flavor_len = 0;
1038 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1039 break;
1040 case Opt_sec_sys:
1041 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
1042 mnt->auth_flavor_len = 0;
1043 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1044 break;
1045 case Opt_sec_krb5:
1046 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1047 mnt->auth_flavor_len = 1;
1048 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1049 break;
1050 case Opt_sec_krb5i:
1051 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1052 mnt->auth_flavor_len = 1;
1053 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1054 break;
1055 case Opt_sec_krb5p:
1056 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1057 mnt->auth_flavor_len = 1;
1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1059 break;
1060 case Opt_sec_lkey:
1061 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1062 mnt->auth_flavor_len = 1;
1063 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1064 break;
1065 case Opt_sec_lkeyi:
1066 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1067 mnt->auth_flavor_len = 1;
1068 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1069 break;
1070 case Opt_sec_lkeyp:
1071 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1072 mnt->auth_flavor_len = 1;
1073 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1074 break;
1075 case Opt_sec_spkm:
1076 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1077 mnt->auth_flavor_len = 1;
1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1079 break;
1080 case Opt_sec_spkmi:
1081 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1082 mnt->auth_flavor_len = 1;
1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1084 break;
1085 case Opt_sec_spkmp:
1086 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1087 mnt->auth_flavor_len = 1;
1088 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1089 break;
1090 default:
1091 goto out_unrec_sec;
1092 }
1093 break;
1094 case Opt_proto:
1095 string = match_strdup(args);
1096 if (string == NULL)
1097 goto out_nomem;
1098 token = match_token(string,
1099 nfs_xprt_protocol_tokens, args);
1100 kfree(string);
1101
1102 switch (token) {
1103 case Opt_xprt_udp:
1104 mnt->flags &= ~NFS_MOUNT_TCP;
1105 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1106 mnt->timeo = 7;
1107 mnt->retrans = 5;
1108 break;
1109 case Opt_xprt_tcp:
1110 mnt->flags |= NFS_MOUNT_TCP;
1111 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1112 mnt->timeo = 600;
1113 mnt->retrans = 2;
1114 break;
1115 case Opt_xprt_rdma:
1116 /* vector side protocols to TCP */
1117 mnt->flags |= NFS_MOUNT_TCP;
1118 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1119 mnt->timeo = 600;
1120 mnt->retrans = 2;
1121 break;
1122 default:
1123 goto out_unrec_xprt;
1124 }
1125 break;
1126 case Opt_mountproto:
1127 string = match_strdup(args);
1128 if (string == NULL)
1129 goto out_nomem;
1130 token = match_token(string,
1131 nfs_xprt_protocol_tokens, args);
1132 kfree(string);
1133
1134 switch (token) {
1135 case Opt_xprt_udp:
1136 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1137 break;
1138 case Opt_xprt_tcp:
1139 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1140 break;
1141 case Opt_xprt_rdma: /* not used for side protocols */
1142 default:
1143 goto out_unrec_xprt;
1144 }
1145 break;
1146 case Opt_addr:
1147 string = match_strdup(args);
1148 if (string == NULL)
1149 goto out_nomem;
1150 nfs_parse_ip_address(string, strlen(string),
1151 (struct sockaddr *)
1152 &mnt->nfs_server.address,
1153 &mnt->nfs_server.addrlen);
1154 kfree(string);
1155 break;
1156 case Opt_clientaddr:
1157 string = match_strdup(args);
1158 if (string == NULL)
1159 goto out_nomem;
1160 kfree(mnt->client_address);
1161 mnt->client_address = string;
1162 break;
1163 case Opt_mounthost:
1164 string = match_strdup(args);
1165 if (string == NULL)
1166 goto out_nomem;
1167 kfree(mnt->mount_server.hostname);
1168 mnt->mount_server.hostname = string;
1169 break;
1170 case Opt_mountaddr:
1171 string = match_strdup(args);
1172 if (string == NULL)
1173 goto out_nomem;
1174 nfs_parse_ip_address(string, strlen(string),
1175 (struct sockaddr *)
1176 &mnt->mount_server.address,
1177 &mnt->mount_server.addrlen);
1178 kfree(string);
1179 break;
1180
1181 case Opt_userspace:
1182 case Opt_deprecated:
1183 dfprintk(MOUNT, "NFS: ignoring mount option "
1184 "'%s'\n", p);
1185 break;
1186
1187 default:
1188 goto out_unknown;
1189 }
1190 }
1191
1192 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1193 mnt->nfs_server.port);
1194
1195 return 1;
1196
1197 out_nomem:
1198 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1199 return 0;
1200 out_security_failure:
1201 free_secdata(secdata);
1202 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1203 return 0;
1204 out_unrec_vers:
1205 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1206 return 0;
1207
1208 out_unrec_xprt:
1209 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1210 return 0;
1211
1212 out_unrec_sec:
1213 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1214 return 0;
1215
1216 out_unknown:
1217 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1218 return 0;
1219 }
1220
1221 /*
1222 * Use the remote server's MOUNT service to request the NFS file handle
1223 * corresponding to the provided path.
1224 */
1225 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1226 struct nfs_fh *root_fh)
1227 {
1228 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1229 char *hostname;
1230 int status;
1231
1232 if (args->mount_server.version == 0) {
1233 if (args->flags & NFS_MOUNT_VER3)
1234 args->mount_server.version = NFS_MNT3_VERSION;
1235 else
1236 args->mount_server.version = NFS_MNT_VERSION;
1237 }
1238
1239 if (args->mount_server.hostname)
1240 hostname = args->mount_server.hostname;
1241 else
1242 hostname = args->nfs_server.hostname;
1243
1244 /*
1245 * Construct the mount server's address.
1246 */
1247 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1248 memcpy(sap, &args->nfs_server.address,
1249 args->nfs_server.addrlen);
1250 args->mount_server.addrlen = args->nfs_server.addrlen;
1251 }
1252
1253 /*
1254 * autobind will be used if mount_server.port == 0
1255 */
1256 nfs_set_port(sap, args->mount_server.port);
1257
1258 /*
1259 * Now ask the mount server to map our export path
1260 * to a file handle.
1261 */
1262 status = nfs_mount(sap,
1263 args->mount_server.addrlen,
1264 hostname,
1265 args->nfs_server.export_path,
1266 args->mount_server.version,
1267 args->mount_server.protocol,
1268 root_fh);
1269 if (status == 0)
1270 return 0;
1271
1272 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1273 hostname, status);
1274 return status;
1275 }
1276
1277 static int nfs_parse_simple_hostname(const char *dev_name,
1278 char **hostname, size_t maxnamlen,
1279 char **export_path, size_t maxpathlen)
1280 {
1281 size_t len;
1282 char *colon, *comma;
1283
1284 colon = strchr(dev_name, ':');
1285 if (colon == NULL)
1286 goto out_bad_devname;
1287
1288 len = colon - dev_name;
1289 if (len > maxnamlen)
1290 goto out_hostname;
1291
1292 /* N.B. caller will free nfs_server.hostname in all cases */
1293 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1294 if (!*hostname)
1295 goto out_nomem;
1296
1297 /* kill possible hostname list: not supported */
1298 comma = strchr(*hostname, ',');
1299 if (comma != NULL) {
1300 if (comma == *hostname)
1301 goto out_bad_devname;
1302 *comma = '\0';
1303 }
1304
1305 colon++;
1306 len = strlen(colon);
1307 if (len > maxpathlen)
1308 goto out_path;
1309 *export_path = kstrndup(colon, len, GFP_KERNEL);
1310 if (!*export_path)
1311 goto out_nomem;
1312
1313 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1314 return 0;
1315
1316 out_bad_devname:
1317 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1318 return -EINVAL;
1319
1320 out_nomem:
1321 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1322 return -ENOMEM;
1323
1324 out_hostname:
1325 dfprintk(MOUNT, "NFS: server hostname too long\n");
1326 return -ENAMETOOLONG;
1327
1328 out_path:
1329 dfprintk(MOUNT, "NFS: export pathname too long\n");
1330 return -ENAMETOOLONG;
1331 }
1332
1333 /*
1334 * Hostname has square brackets around it because it contains one or
1335 * more colons. We look for the first closing square bracket, and a
1336 * colon must follow it.
1337 */
1338 static int nfs_parse_protected_hostname(const char *dev_name,
1339 char **hostname, size_t maxnamlen,
1340 char **export_path, size_t maxpathlen)
1341 {
1342 size_t len;
1343 char *start, *end;
1344
1345 start = (char *)(dev_name + 1);
1346
1347 end = strchr(start, ']');
1348 if (end == NULL)
1349 goto out_bad_devname;
1350 if (*(end + 1) != ':')
1351 goto out_bad_devname;
1352
1353 len = end - start;
1354 if (len > maxnamlen)
1355 goto out_hostname;
1356
1357 /* N.B. caller will free nfs_server.hostname in all cases */
1358 *hostname = kstrndup(start, len, GFP_KERNEL);
1359 if (*hostname == NULL)
1360 goto out_nomem;
1361
1362 end += 2;
1363 len = strlen(end);
1364 if (len > maxpathlen)
1365 goto out_path;
1366 *export_path = kstrndup(end, len, GFP_KERNEL);
1367 if (!*export_path)
1368 goto out_nomem;
1369
1370 return 0;
1371
1372 out_bad_devname:
1373 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1374 return -EINVAL;
1375
1376 out_nomem:
1377 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1378 return -ENOMEM;
1379
1380 out_hostname:
1381 dfprintk(MOUNT, "NFS: server hostname too long\n");
1382 return -ENAMETOOLONG;
1383
1384 out_path:
1385 dfprintk(MOUNT, "NFS: export pathname too long\n");
1386 return -ENAMETOOLONG;
1387 }
1388
1389 /*
1390 * Split "dev_name" into "hostname:export_path".
1391 *
1392 * The leftmost colon demarks the split between the server's hostname
1393 * and the export path. If the hostname starts with a left square
1394 * bracket, then it may contain colons.
1395 *
1396 * Note: caller frees hostname and export path, even on error.
1397 */
1398 static int nfs_parse_devname(const char *dev_name,
1399 char **hostname, size_t maxnamlen,
1400 char **export_path, size_t maxpathlen)
1401 {
1402 if (*dev_name == '[')
1403 return nfs_parse_protected_hostname(dev_name,
1404 hostname, maxnamlen,
1405 export_path, maxpathlen);
1406
1407 return nfs_parse_simple_hostname(dev_name,
1408 hostname, maxnamlen,
1409 export_path, maxpathlen);
1410 }
1411
1412 /*
1413 * Validate the NFS2/NFS3 mount data
1414 * - fills in the mount root filehandle
1415 *
1416 * For option strings, user space handles the following behaviors:
1417 *
1418 * + DNS: mapping server host name to IP address ("addr=" option)
1419 *
1420 * + failure mode: how to behave if a mount request can't be handled
1421 * immediately ("fg/bg" option)
1422 *
1423 * + retry: how often to retry a mount request ("retry=" option)
1424 *
1425 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1426 * mountproto=tcp after mountproto=udp, and so on
1427 */
1428 static int nfs_validate_mount_data(void *options,
1429 struct nfs_parsed_mount_data *args,
1430 struct nfs_fh *mntfh,
1431 const char *dev_name)
1432 {
1433 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1434
1435 if (data == NULL)
1436 goto out_no_data;
1437
1438 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1439 args->rsize = NFS_MAX_FILE_IO_SIZE;
1440 args->wsize = NFS_MAX_FILE_IO_SIZE;
1441 args->timeo = 600;
1442 args->retrans = 2;
1443 args->acregmin = 3;
1444 args->acregmax = 60;
1445 args->acdirmin = 30;
1446 args->acdirmax = 60;
1447 args->mount_server.port = 0; /* autobind unless user sets port */
1448 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1449 args->nfs_server.port = 0; /* autobind unless user sets port */
1450 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1451
1452 switch (data->version) {
1453 case 1:
1454 data->namlen = 0;
1455 case 2:
1456 data->bsize = 0;
1457 case 3:
1458 if (data->flags & NFS_MOUNT_VER3)
1459 goto out_no_v3;
1460 data->root.size = NFS2_FHSIZE;
1461 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1462 case 4:
1463 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1464 goto out_no_sec;
1465 case 5:
1466 memset(data->context, 0, sizeof(data->context));
1467 case 6:
1468 if (data->flags & NFS_MOUNT_VER3) {
1469 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1470 goto out_invalid_fh;
1471 mntfh->size = data->root.size;
1472 } else
1473 mntfh->size = NFS2_FHSIZE;
1474
1475
1476 memcpy(mntfh->data, data->root.data, mntfh->size);
1477 if (mntfh->size < sizeof(mntfh->data))
1478 memset(mntfh->data + mntfh->size, 0,
1479 sizeof(mntfh->data) - mntfh->size);
1480
1481 /*
1482 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1483 * can deal with.
1484 */
1485 args->flags = data->flags;
1486 args->rsize = data->rsize;
1487 args->wsize = data->wsize;
1488 args->timeo = data->timeo;
1489 args->retrans = data->retrans;
1490 args->acregmin = data->acregmin;
1491 args->acregmax = data->acregmax;
1492 args->acdirmin = data->acdirmin;
1493 args->acdirmax = data->acdirmax;
1494
1495 memcpy(&args->nfs_server.address, &data->addr,
1496 sizeof(data->addr));
1497 args->nfs_server.addrlen = sizeof(data->addr);
1498 if (!nfs_verify_server_address((struct sockaddr *)
1499 &args->nfs_server.address))
1500 goto out_no_address;
1501
1502 if (!(data->flags & NFS_MOUNT_TCP))
1503 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1504 /* N.B. caller will free nfs_server.hostname in all cases */
1505 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1506 args->namlen = data->namlen;
1507 args->bsize = data->bsize;
1508 args->auth_flavors[0] = data->pseudoflavor;
1509 if (!args->nfs_server.hostname)
1510 goto out_nomem;
1511
1512 /*
1513 * The legacy version 6 binary mount data from userspace has a
1514 * field used only to transport selinux information into the
1515 * the kernel. To continue to support that functionality we
1516 * have a touch of selinux knowledge here in the NFS code. The
1517 * userspace code converted context=blah to just blah so we are
1518 * converting back to the full string selinux understands.
1519 */
1520 if (data->context[0]){
1521 #ifdef CONFIG_SECURITY_SELINUX
1522 int rc;
1523 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1524 if (!opts_str)
1525 return -ENOMEM;
1526 strcpy(opts_str, "context=");
1527 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1528 strcat(opts_str, &data->context[0]);
1529 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1530 kfree(opts_str);
1531 if (rc)
1532 return rc;
1533 #else
1534 return -EINVAL;
1535 #endif
1536 }
1537
1538 break;
1539 default: {
1540 int status;
1541
1542 if (nfs_parse_mount_options((char *)options, args) == 0)
1543 return -EINVAL;
1544
1545 if (!nfs_verify_server_address((struct sockaddr *)
1546 &args->nfs_server.address))
1547 goto out_no_address;
1548
1549 status = nfs_parse_devname(dev_name,
1550 &args->nfs_server.hostname,
1551 PAGE_SIZE,
1552 &args->nfs_server.export_path,
1553 NFS_MAXPATHLEN);
1554 if (!status)
1555 status = nfs_try_mount(args, mntfh);
1556
1557 kfree(args->nfs_server.export_path);
1558 args->nfs_server.export_path = NULL;
1559
1560 if (status)
1561 return status;
1562
1563 break;
1564 }
1565 }
1566
1567 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1568 args->auth_flavors[0] = RPC_AUTH_UNIX;
1569
1570 #ifndef CONFIG_NFS_V3
1571 if (args->flags & NFS_MOUNT_VER3)
1572 goto out_v3_not_compiled;
1573 #endif /* !CONFIG_NFS_V3 */
1574
1575 return 0;
1576
1577 out_no_data:
1578 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1579 return -EINVAL;
1580
1581 out_no_v3:
1582 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1583 data->version);
1584 return -EINVAL;
1585
1586 out_no_sec:
1587 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1588 return -EINVAL;
1589
1590 #ifndef CONFIG_NFS_V3
1591 out_v3_not_compiled:
1592 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1593 return -EPROTONOSUPPORT;
1594 #endif /* !CONFIG_NFS_V3 */
1595
1596 out_nomem:
1597 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1598 return -ENOMEM;
1599
1600 out_no_address:
1601 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1602 return -EINVAL;
1603
1604 out_invalid_fh:
1605 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1606 return -EINVAL;
1607 }
1608
1609 static int
1610 nfs_compare_remount_data(struct nfs_server *nfss,
1611 struct nfs_parsed_mount_data *data)
1612 {
1613 if (data->flags != nfss->flags ||
1614 data->rsize != nfss->rsize ||
1615 data->wsize != nfss->wsize ||
1616 data->retrans != nfss->client->cl_timeout->to_retries ||
1617 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1618 data->acregmin != nfss->acregmin / HZ ||
1619 data->acregmax != nfss->acregmax / HZ ||
1620 data->acdirmin != nfss->acdirmin / HZ ||
1621 data->acdirmax != nfss->acdirmax / HZ ||
1622 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1623 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1624 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1625 data->nfs_server.addrlen) != 0)
1626 return -EINVAL;
1627
1628 return 0;
1629 }
1630
1631 static int
1632 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1633 {
1634 int error;
1635 struct nfs_server *nfss = sb->s_fs_info;
1636 struct nfs_parsed_mount_data *data;
1637 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1638 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1639 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1640
1641 /*
1642 * Userspace mount programs that send binary options generally send
1643 * them populated with default values. We have no way to know which
1644 * ones were explicitly specified. Fall back to legacy behavior and
1645 * just return success.
1646 */
1647 if ((nfsvers == 4 && options4->version == 1) ||
1648 (nfsvers <= 3 && options->version >= 1 &&
1649 options->version <= 6))
1650 return 0;
1651
1652 data = kzalloc(sizeof(*data), GFP_KERNEL);
1653 if (data == NULL)
1654 return -ENOMEM;
1655
1656 /* fill out struct with values from existing mount */
1657 data->flags = nfss->flags;
1658 data->rsize = nfss->rsize;
1659 data->wsize = nfss->wsize;
1660 data->retrans = nfss->client->cl_timeout->to_retries;
1661 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1662 data->acregmin = nfss->acregmin / HZ;
1663 data->acregmax = nfss->acregmax / HZ;
1664 data->acdirmin = nfss->acdirmin / HZ;
1665 data->acdirmax = nfss->acdirmax / HZ;
1666 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1667 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1668 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1669 data->nfs_server.addrlen);
1670
1671 /* overwrite those values with any that were specified */
1672 error = nfs_parse_mount_options((char *)options, data);
1673 if (error < 0)
1674 goto out;
1675
1676 /* compare new mount options with old ones */
1677 error = nfs_compare_remount_data(nfss, data);
1678 out:
1679 kfree(data);
1680 return error;
1681 }
1682
1683 /*
1684 * Initialise the common bits of the superblock
1685 */
1686 static inline void nfs_initialise_sb(struct super_block *sb)
1687 {
1688 struct nfs_server *server = NFS_SB(sb);
1689
1690 sb->s_magic = NFS_SUPER_MAGIC;
1691
1692 /* We probably want something more informative here */
1693 snprintf(sb->s_id, sizeof(sb->s_id),
1694 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1695
1696 if (sb->s_blocksize == 0)
1697 sb->s_blocksize = nfs_block_bits(server->wsize,
1698 &sb->s_blocksize_bits);
1699
1700 if (server->flags & NFS_MOUNT_NOAC)
1701 sb->s_flags |= MS_SYNCHRONOUS;
1702
1703 nfs_super_set_maxbytes(sb, server->maxfilesize);
1704 }
1705
1706 /*
1707 * Finish setting up an NFS2/3 superblock
1708 */
1709 static void nfs_fill_super(struct super_block *sb,
1710 struct nfs_parsed_mount_data *data)
1711 {
1712 struct nfs_server *server = NFS_SB(sb);
1713
1714 sb->s_blocksize_bits = 0;
1715 sb->s_blocksize = 0;
1716 if (data->bsize)
1717 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1718
1719 if (server->flags & NFS_MOUNT_VER3) {
1720 /* The VFS shouldn't apply the umask to mode bits. We will do
1721 * so ourselves when necessary.
1722 */
1723 sb->s_flags |= MS_POSIXACL;
1724 sb->s_time_gran = 1;
1725 }
1726
1727 sb->s_op = &nfs_sops;
1728 nfs_initialise_sb(sb);
1729 }
1730
1731 /*
1732 * Finish setting up a cloned NFS2/3 superblock
1733 */
1734 static void nfs_clone_super(struct super_block *sb,
1735 const struct super_block *old_sb)
1736 {
1737 struct nfs_server *server = NFS_SB(sb);
1738
1739 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1740 sb->s_blocksize = old_sb->s_blocksize;
1741 sb->s_maxbytes = old_sb->s_maxbytes;
1742
1743 if (server->flags & NFS_MOUNT_VER3) {
1744 /* The VFS shouldn't apply the umask to mode bits. We will do
1745 * so ourselves when necessary.
1746 */
1747 sb->s_flags |= MS_POSIXACL;
1748 sb->s_time_gran = 1;
1749 }
1750
1751 sb->s_op = old_sb->s_op;
1752 nfs_initialise_sb(sb);
1753 }
1754
1755 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1756
1757 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1758 {
1759 const struct nfs_server *a = s->s_fs_info;
1760 const struct rpc_clnt *clnt_a = a->client;
1761 const struct rpc_clnt *clnt_b = b->client;
1762
1763 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1764 goto Ebusy;
1765 if (a->nfs_client != b->nfs_client)
1766 goto Ebusy;
1767 if (a->flags != b->flags)
1768 goto Ebusy;
1769 if (a->wsize != b->wsize)
1770 goto Ebusy;
1771 if (a->rsize != b->rsize)
1772 goto Ebusy;
1773 if (a->acregmin != b->acregmin)
1774 goto Ebusy;
1775 if (a->acregmax != b->acregmax)
1776 goto Ebusy;
1777 if (a->acdirmin != b->acdirmin)
1778 goto Ebusy;
1779 if (a->acdirmax != b->acdirmax)
1780 goto Ebusy;
1781 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1782 goto Ebusy;
1783 return 1;
1784 Ebusy:
1785 return 0;
1786 }
1787
1788 struct nfs_sb_mountdata {
1789 struct nfs_server *server;
1790 int mntflags;
1791 };
1792
1793 static int nfs_set_super(struct super_block *s, void *data)
1794 {
1795 struct nfs_sb_mountdata *sb_mntdata = data;
1796 struct nfs_server *server = sb_mntdata->server;
1797 int ret;
1798
1799 s->s_flags = sb_mntdata->mntflags;
1800 s->s_fs_info = server;
1801 ret = set_anon_super(s, server);
1802 if (ret == 0)
1803 server->s_dev = s->s_dev;
1804 return ret;
1805 }
1806
1807 static int nfs_compare_super_address(struct nfs_server *server1,
1808 struct nfs_server *server2)
1809 {
1810 struct sockaddr *sap1, *sap2;
1811
1812 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1813 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1814
1815 if (sap1->sa_family != sap2->sa_family)
1816 return 0;
1817
1818 switch (sap1->sa_family) {
1819 case AF_INET: {
1820 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1821 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1822 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1823 return 0;
1824 if (sin1->sin_port != sin2->sin_port)
1825 return 0;
1826 break;
1827 }
1828 case AF_INET6: {
1829 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1830 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1831 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1832 return 0;
1833 if (sin1->sin6_port != sin2->sin6_port)
1834 return 0;
1835 break;
1836 }
1837 default:
1838 return 0;
1839 }
1840
1841 return 1;
1842 }
1843
1844 static int nfs_compare_super(struct super_block *sb, void *data)
1845 {
1846 struct nfs_sb_mountdata *sb_mntdata = data;
1847 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1848 int mntflags = sb_mntdata->mntflags;
1849
1850 if (!nfs_compare_super_address(old, server))
1851 return 0;
1852 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1853 if (old->flags & NFS_MOUNT_UNSHARED)
1854 return 0;
1855 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1856 return 0;
1857 return nfs_compare_mount_options(sb, server, mntflags);
1858 }
1859
1860 static int nfs_bdi_register(struct nfs_server *server)
1861 {
1862 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1863 }
1864
1865 static int nfs_get_sb(struct file_system_type *fs_type,
1866 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1867 {
1868 struct nfs_server *server = NULL;
1869 struct super_block *s;
1870 struct nfs_parsed_mount_data *data;
1871 struct nfs_fh *mntfh;
1872 struct dentry *mntroot;
1873 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1874 struct nfs_sb_mountdata sb_mntdata = {
1875 .mntflags = flags,
1876 };
1877 int error = -ENOMEM;
1878
1879 data = kzalloc(sizeof(*data), GFP_KERNEL);
1880 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1881 if (data == NULL || mntfh == NULL)
1882 goto out_free_fh;
1883
1884 security_init_mnt_opts(&data->lsm_opts);
1885
1886 /* Validate the mount data */
1887 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1888 if (error < 0)
1889 goto out;
1890
1891 /* Get a volume representation */
1892 server = nfs_create_server(data, mntfh);
1893 if (IS_ERR(server)) {
1894 error = PTR_ERR(server);
1895 goto out;
1896 }
1897 sb_mntdata.server = server;
1898
1899 if (server->flags & NFS_MOUNT_UNSHARED)
1900 compare_super = NULL;
1901
1902 /* Get a superblock - note that we may end up sharing one that already exists */
1903 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1904 if (IS_ERR(s)) {
1905 error = PTR_ERR(s);
1906 goto out_err_nosb;
1907 }
1908
1909 if (s->s_fs_info != server) {
1910 nfs_free_server(server);
1911 server = NULL;
1912 } else {
1913 error = nfs_bdi_register(server);
1914 if (error)
1915 goto error_splat_super;
1916 }
1917
1918 if (!s->s_root) {
1919 /* initial superblock/root creation */
1920 nfs_fill_super(s, data);
1921 }
1922
1923 mntroot = nfs_get_root(s, mntfh);
1924 if (IS_ERR(mntroot)) {
1925 error = PTR_ERR(mntroot);
1926 goto error_splat_super;
1927 }
1928
1929 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1930 if (error)
1931 goto error_splat_root;
1932
1933 s->s_flags |= MS_ACTIVE;
1934 mnt->mnt_sb = s;
1935 mnt->mnt_root = mntroot;
1936 error = 0;
1937
1938 out:
1939 kfree(data->nfs_server.hostname);
1940 kfree(data->mount_server.hostname);
1941 security_free_mnt_opts(&data->lsm_opts);
1942 out_free_fh:
1943 kfree(mntfh);
1944 kfree(data);
1945 return error;
1946
1947 out_err_nosb:
1948 nfs_free_server(server);
1949 goto out;
1950
1951 error_splat_root:
1952 dput(mntroot);
1953 error_splat_super:
1954 up_write(&s->s_umount);
1955 deactivate_super(s);
1956 goto out;
1957 }
1958
1959 /*
1960 * Destroy an NFS2/3 superblock
1961 */
1962 static void nfs_kill_super(struct super_block *s)
1963 {
1964 struct nfs_server *server = NFS_SB(s);
1965
1966 bdi_unregister(&server->backing_dev_info);
1967 kill_anon_super(s);
1968 nfs_free_server(server);
1969 }
1970
1971 /*
1972 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1973 */
1974 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1975 const char *dev_name, void *raw_data,
1976 struct vfsmount *mnt)
1977 {
1978 struct nfs_clone_mount *data = raw_data;
1979 struct super_block *s;
1980 struct nfs_server *server;
1981 struct dentry *mntroot;
1982 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1983 struct nfs_sb_mountdata sb_mntdata = {
1984 .mntflags = flags,
1985 };
1986 int error;
1987
1988 dprintk("--> nfs_xdev_get_sb()\n");
1989
1990 /* create a new volume representation */
1991 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1992 if (IS_ERR(server)) {
1993 error = PTR_ERR(server);
1994 goto out_err_noserver;
1995 }
1996 sb_mntdata.server = server;
1997
1998 if (server->flags & NFS_MOUNT_UNSHARED)
1999 compare_super = NULL;
2000
2001 /* Get a superblock - note that we may end up sharing one that already exists */
2002 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2003 if (IS_ERR(s)) {
2004 error = PTR_ERR(s);
2005 goto out_err_nosb;
2006 }
2007
2008 if (s->s_fs_info != server) {
2009 nfs_free_server(server);
2010 server = NULL;
2011 } else {
2012 error = nfs_bdi_register(server);
2013 if (error)
2014 goto error_splat_super;
2015 }
2016
2017 if (!s->s_root) {
2018 /* initial superblock/root creation */
2019 nfs_clone_super(s, data->sb);
2020 }
2021
2022 mntroot = nfs_get_root(s, data->fh);
2023 if (IS_ERR(mntroot)) {
2024 error = PTR_ERR(mntroot);
2025 goto error_splat_super;
2026 }
2027 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2028 dput(mntroot);
2029 error = -ESTALE;
2030 goto error_splat_super;
2031 }
2032
2033 s->s_flags |= MS_ACTIVE;
2034 mnt->mnt_sb = s;
2035 mnt->mnt_root = mntroot;
2036
2037 /* clone any lsm security options from the parent to the new sb */
2038 security_sb_clone_mnt_opts(data->sb, s);
2039
2040 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2041 return 0;
2042
2043 out_err_nosb:
2044 nfs_free_server(server);
2045 out_err_noserver:
2046 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2047 return error;
2048
2049 error_splat_super:
2050 up_write(&s->s_umount);
2051 deactivate_super(s);
2052 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2053 return error;
2054 }
2055
2056 #ifdef CONFIG_NFS_V4
2057
2058 /*
2059 * Finish setting up a cloned NFS4 superblock
2060 */
2061 static void nfs4_clone_super(struct super_block *sb,
2062 const struct super_block *old_sb)
2063 {
2064 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2065 sb->s_blocksize = old_sb->s_blocksize;
2066 sb->s_maxbytes = old_sb->s_maxbytes;
2067 sb->s_time_gran = 1;
2068 sb->s_op = old_sb->s_op;
2069 nfs_initialise_sb(sb);
2070 }
2071
2072 /*
2073 * Set up an NFS4 superblock
2074 */
2075 static void nfs4_fill_super(struct super_block *sb)
2076 {
2077 sb->s_time_gran = 1;
2078 sb->s_op = &nfs4_sops;
2079 nfs_initialise_sb(sb);
2080 }
2081
2082 /*
2083 * Validate NFSv4 mount options
2084 */
2085 static int nfs4_validate_mount_data(void *options,
2086 struct nfs_parsed_mount_data *args,
2087 const char *dev_name)
2088 {
2089 struct sockaddr_in *ap;
2090 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2091 char *c;
2092
2093 if (data == NULL)
2094 goto out_no_data;
2095
2096 args->rsize = NFS_MAX_FILE_IO_SIZE;
2097 args->wsize = NFS_MAX_FILE_IO_SIZE;
2098 args->timeo = 600;
2099 args->retrans = 2;
2100 args->acregmin = 3;
2101 args->acregmax = 60;
2102 args->acdirmin = 30;
2103 args->acdirmax = 60;
2104 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2105 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
2106
2107 switch (data->version) {
2108 case 1:
2109 ap = (struct sockaddr_in *)&args->nfs_server.address;
2110 if (data->host_addrlen > sizeof(args->nfs_server.address))
2111 goto out_no_address;
2112 if (data->host_addrlen == 0)
2113 goto out_no_address;
2114 args->nfs_server.addrlen = data->host_addrlen;
2115 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2116 return -EFAULT;
2117 if (!nfs_verify_server_address((struct sockaddr *)
2118 &args->nfs_server.address))
2119 goto out_no_address;
2120
2121 switch (data->auth_flavourlen) {
2122 case 0:
2123 args->auth_flavors[0] = RPC_AUTH_UNIX;
2124 break;
2125 case 1:
2126 if (copy_from_user(&args->auth_flavors[0],
2127 data->auth_flavours,
2128 sizeof(args->auth_flavors[0])))
2129 return -EFAULT;
2130 break;
2131 default:
2132 goto out_inval_auth;
2133 }
2134
2135 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2136 if (IS_ERR(c))
2137 return PTR_ERR(c);
2138 args->nfs_server.hostname = c;
2139
2140 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2141 if (IS_ERR(c))
2142 return PTR_ERR(c);
2143 args->nfs_server.export_path = c;
2144 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2145
2146 c = strndup_user(data->client_addr.data, 16);
2147 if (IS_ERR(c))
2148 return PTR_ERR(c);
2149 args->client_address = c;
2150
2151 /*
2152 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2153 * can deal with.
2154 */
2155
2156 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2157 args->rsize = data->rsize;
2158 args->wsize = data->wsize;
2159 args->timeo = data->timeo;
2160 args->retrans = data->retrans;
2161 args->acregmin = data->acregmin;
2162 args->acregmax = data->acregmax;
2163 args->acdirmin = data->acdirmin;
2164 args->acdirmax = data->acdirmax;
2165 args->nfs_server.protocol = data->proto;
2166
2167 break;
2168 default: {
2169 int status;
2170
2171 if (nfs_parse_mount_options((char *)options, args) == 0)
2172 return -EINVAL;
2173
2174 if (!nfs_verify_server_address((struct sockaddr *)
2175 &args->nfs_server.address))
2176 return -EINVAL;
2177
2178 switch (args->auth_flavor_len) {
2179 case 0:
2180 args->auth_flavors[0] = RPC_AUTH_UNIX;
2181 break;
2182 case 1:
2183 break;
2184 default:
2185 goto out_inval_auth;
2186 }
2187
2188 if (args->client_address == NULL)
2189 goto out_no_client_address;
2190
2191 status = nfs_parse_devname(dev_name,
2192 &args->nfs_server.hostname,
2193 NFS4_MAXNAMLEN,
2194 &args->nfs_server.export_path,
2195 NFS4_MAXPATHLEN);
2196 if (status < 0)
2197 return status;
2198
2199 break;
2200 }
2201 }
2202
2203 return 0;
2204
2205 out_no_data:
2206 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2207 return -EINVAL;
2208
2209 out_inval_auth:
2210 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2211 data->auth_flavourlen);
2212 return -EINVAL;
2213
2214 out_no_address:
2215 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2216 return -EINVAL;
2217
2218 out_no_client_address:
2219 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2220 return -EINVAL;
2221 }
2222
2223 /*
2224 * Get the superblock for an NFS4 mountpoint
2225 */
2226 static int nfs4_get_sb(struct file_system_type *fs_type,
2227 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2228 {
2229 struct nfs_parsed_mount_data *data;
2230 struct super_block *s;
2231 struct nfs_server *server;
2232 struct nfs_fh *mntfh;
2233 struct dentry *mntroot;
2234 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2235 struct nfs_sb_mountdata sb_mntdata = {
2236 .mntflags = flags,
2237 };
2238 int error = -ENOMEM;
2239
2240 data = kzalloc(sizeof(*data), GFP_KERNEL);
2241 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2242 if (data == NULL || mntfh == NULL)
2243 goto out_free_fh;
2244
2245 security_init_mnt_opts(&data->lsm_opts);
2246
2247 /* Validate the mount data */
2248 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2249 if (error < 0)
2250 goto out;
2251
2252 /* Get a volume representation */
2253 server = nfs4_create_server(data, mntfh);
2254 if (IS_ERR(server)) {
2255 error = PTR_ERR(server);
2256 goto out;
2257 }
2258 sb_mntdata.server = server;
2259
2260 if (server->flags & NFS4_MOUNT_UNSHARED)
2261 compare_super = NULL;
2262
2263 /* Get a superblock - note that we may end up sharing one that already exists */
2264 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2265 if (IS_ERR(s)) {
2266 error = PTR_ERR(s);
2267 goto out_free;
2268 }
2269
2270 if (s->s_fs_info != server) {
2271 nfs_free_server(server);
2272 server = NULL;
2273 } else {
2274 error = nfs_bdi_register(server);
2275 if (error)
2276 goto error_splat_super;
2277 }
2278
2279 if (!s->s_root) {
2280 /* initial superblock/root creation */
2281 nfs4_fill_super(s);
2282 }
2283
2284 mntroot = nfs4_get_root(s, mntfh);
2285 if (IS_ERR(mntroot)) {
2286 error = PTR_ERR(mntroot);
2287 goto error_splat_super;
2288 }
2289
2290 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2291 if (error)
2292 goto error_splat_root;
2293
2294 s->s_flags |= MS_ACTIVE;
2295 mnt->mnt_sb = s;
2296 mnt->mnt_root = mntroot;
2297 error = 0;
2298
2299 out:
2300 kfree(data->client_address);
2301 kfree(data->nfs_server.export_path);
2302 kfree(data->nfs_server.hostname);
2303 security_free_mnt_opts(&data->lsm_opts);
2304 out_free_fh:
2305 kfree(mntfh);
2306 kfree(data);
2307 return error;
2308
2309 out_free:
2310 nfs_free_server(server);
2311 goto out;
2312
2313 error_splat_root:
2314 dput(mntroot);
2315 error_splat_super:
2316 up_write(&s->s_umount);
2317 deactivate_super(s);
2318 goto out;
2319 }
2320
2321 static void nfs4_kill_super(struct super_block *sb)
2322 {
2323 struct nfs_server *server = NFS_SB(sb);
2324
2325 nfs_return_all_delegations(sb);
2326 kill_anon_super(sb);
2327
2328 nfs4_renewd_prepare_shutdown(server);
2329 nfs_free_server(server);
2330 }
2331
2332 /*
2333 * Clone an NFS4 server record on xdev traversal (FSID-change)
2334 */
2335 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2336 const char *dev_name, void *raw_data,
2337 struct vfsmount *mnt)
2338 {
2339 struct nfs_clone_mount *data = raw_data;
2340 struct super_block *s;
2341 struct nfs_server *server;
2342 struct dentry *mntroot;
2343 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2344 struct nfs_sb_mountdata sb_mntdata = {
2345 .mntflags = flags,
2346 };
2347 int error;
2348
2349 dprintk("--> nfs4_xdev_get_sb()\n");
2350
2351 /* create a new volume representation */
2352 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2353 if (IS_ERR(server)) {
2354 error = PTR_ERR(server);
2355 goto out_err_noserver;
2356 }
2357 sb_mntdata.server = server;
2358
2359 if (server->flags & NFS4_MOUNT_UNSHARED)
2360 compare_super = NULL;
2361
2362 /* Get a superblock - note that we may end up sharing one that already exists */
2363 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2364 if (IS_ERR(s)) {
2365 error = PTR_ERR(s);
2366 goto out_err_nosb;
2367 }
2368
2369 if (s->s_fs_info != server) {
2370 nfs_free_server(server);
2371 server = NULL;
2372 } else {
2373 error = nfs_bdi_register(server);
2374 if (error)
2375 goto error_splat_super;
2376 }
2377
2378 if (!s->s_root) {
2379 /* initial superblock/root creation */
2380 nfs4_clone_super(s, data->sb);
2381 }
2382
2383 mntroot = nfs4_get_root(s, data->fh);
2384 if (IS_ERR(mntroot)) {
2385 error = PTR_ERR(mntroot);
2386 goto error_splat_super;
2387 }
2388 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2389 dput(mntroot);
2390 error = -ESTALE;
2391 goto error_splat_super;
2392 }
2393
2394 s->s_flags |= MS_ACTIVE;
2395 mnt->mnt_sb = s;
2396 mnt->mnt_root = mntroot;
2397
2398 security_sb_clone_mnt_opts(data->sb, s);
2399
2400 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2401 return 0;
2402
2403 out_err_nosb:
2404 nfs_free_server(server);
2405 out_err_noserver:
2406 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2407 return error;
2408
2409 error_splat_super:
2410 up_write(&s->s_umount);
2411 deactivate_super(s);
2412 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2413 return error;
2414 }
2415
2416 /*
2417 * Create an NFS4 server record on referral traversal
2418 */
2419 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2420 const char *dev_name, void *raw_data,
2421 struct vfsmount *mnt)
2422 {
2423 struct nfs_clone_mount *data = raw_data;
2424 struct super_block *s;
2425 struct nfs_server *server;
2426 struct dentry *mntroot;
2427 struct nfs_fh mntfh;
2428 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2429 struct nfs_sb_mountdata sb_mntdata = {
2430 .mntflags = flags,
2431 };
2432 int error;
2433
2434 dprintk("--> nfs4_referral_get_sb()\n");
2435
2436 /* create a new volume representation */
2437 server = nfs4_create_referral_server(data, &mntfh);
2438 if (IS_ERR(server)) {
2439 error = PTR_ERR(server);
2440 goto out_err_noserver;
2441 }
2442 sb_mntdata.server = server;
2443
2444 if (server->flags & NFS4_MOUNT_UNSHARED)
2445 compare_super = NULL;
2446
2447 /* Get a superblock - note that we may end up sharing one that already exists */
2448 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2449 if (IS_ERR(s)) {
2450 error = PTR_ERR(s);
2451 goto out_err_nosb;
2452 }
2453
2454 if (s->s_fs_info != server) {
2455 nfs_free_server(server);
2456 server = NULL;
2457 } else {
2458 error = nfs_bdi_register(server);
2459 if (error)
2460 goto error_splat_super;
2461 }
2462
2463 if (!s->s_root) {
2464 /* initial superblock/root creation */
2465 nfs4_fill_super(s);
2466 }
2467
2468 mntroot = nfs4_get_root(s, &mntfh);
2469 if (IS_ERR(mntroot)) {
2470 error = PTR_ERR(mntroot);
2471 goto error_splat_super;
2472 }
2473 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2474 dput(mntroot);
2475 error = -ESTALE;
2476 goto error_splat_super;
2477 }
2478
2479 s->s_flags |= MS_ACTIVE;
2480 mnt->mnt_sb = s;
2481 mnt->mnt_root = mntroot;
2482
2483 security_sb_clone_mnt_opts(data->sb, s);
2484
2485 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2486 return 0;
2487
2488 out_err_nosb:
2489 nfs_free_server(server);
2490 out_err_noserver:
2491 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2492 return error;
2493
2494 error_splat_super:
2495 up_write(&s->s_umount);
2496 deactivate_super(s);
2497 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2498 return error;
2499 }
2500
2501 #endif /* CONFIG_NFS_V4 */
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