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NFS: missing newline in NFS mount debugging message
[mirror_ubuntu-bionic-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/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
53
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
56
57 #include "nfs4_fs.h"
58 #include "callback.h"
59 #include "delegation.h"
60 #include "iostat.h"
61 #include "internal.h"
62
63 #define NFSDBG_FACILITY NFSDBG_VFS
64
65 enum {
66 /* Mount options that take no arguments */
67 Opt_soft, Opt_hard,
68 Opt_posix, Opt_noposix,
69 Opt_cto, Opt_nocto,
70 Opt_ac, Opt_noac,
71 Opt_lock, Opt_nolock,
72 Opt_v2, Opt_v3,
73 Opt_udp, Opt_tcp, Opt_rdma,
74 Opt_acl, Opt_noacl,
75 Opt_rdirplus, Opt_nordirplus,
76 Opt_sharecache, Opt_nosharecache,
77
78 /* Mount options that take integer arguments */
79 Opt_port,
80 Opt_rsize, Opt_wsize, Opt_bsize,
81 Opt_timeo, Opt_retrans,
82 Opt_acregmin, Opt_acregmax,
83 Opt_acdirmin, Opt_acdirmax,
84 Opt_actimeo,
85 Opt_namelen,
86 Opt_mountport,
87 Opt_mountvers,
88 Opt_nfsvers,
89
90 /* Mount options that take string arguments */
91 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
92 Opt_addr, Opt_mountaddr, Opt_clientaddr,
93
94 /* Mount options that are ignored */
95 Opt_userspace, Opt_deprecated,
96
97 Opt_err
98 };
99
100 static match_table_t nfs_mount_option_tokens = {
101 { Opt_userspace, "bg" },
102 { Opt_userspace, "fg" },
103 { Opt_userspace, "retry=%s" },
104
105 { Opt_soft, "soft" },
106 { Opt_hard, "hard" },
107 { Opt_deprecated, "intr" },
108 { Opt_deprecated, "nointr" },
109 { Opt_posix, "posix" },
110 { Opt_noposix, "noposix" },
111 { Opt_cto, "cto" },
112 { Opt_nocto, "nocto" },
113 { Opt_ac, "ac" },
114 { Opt_noac, "noac" },
115 { Opt_lock, "lock" },
116 { Opt_nolock, "nolock" },
117 { Opt_v2, "v2" },
118 { Opt_v3, "v3" },
119 { Opt_udp, "udp" },
120 { Opt_tcp, "tcp" },
121 { Opt_rdma, "rdma" },
122 { Opt_acl, "acl" },
123 { Opt_noacl, "noacl" },
124 { Opt_rdirplus, "rdirplus" },
125 { Opt_nordirplus, "nordirplus" },
126 { Opt_sharecache, "sharecache" },
127 { Opt_nosharecache, "nosharecache" },
128
129 { Opt_port, "port=%u" },
130 { Opt_rsize, "rsize=%u" },
131 { Opt_wsize, "wsize=%u" },
132 { Opt_bsize, "bsize=%u" },
133 { Opt_timeo, "timeo=%u" },
134 { Opt_retrans, "retrans=%u" },
135 { Opt_acregmin, "acregmin=%u" },
136 { Opt_acregmax, "acregmax=%u" },
137 { Opt_acdirmin, "acdirmin=%u" },
138 { Opt_acdirmax, "acdirmax=%u" },
139 { Opt_actimeo, "actimeo=%u" },
140 { Opt_namelen, "namlen=%u" },
141 { Opt_mountport, "mountport=%u" },
142 { Opt_mountvers, "mountvers=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
145
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
151 { Opt_mounthost, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
153
154 { Opt_err, NULL }
155 };
156
157 enum {
158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
159
160 Opt_xprt_err
161 };
162
163 static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
166 { Opt_xprt_rdma, "rdma" },
167
168 { Opt_xprt_err, NULL }
169 };
170
171 enum {
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
176
177 Opt_sec_err
178 };
179
180 static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
184
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
188
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
192
193 { Opt_sec_spkm, "spkm3" },
194 { Opt_sec_spkmi, "spkm3i" },
195 { Opt_sec_spkmp, "spkm3p" },
196
197 { Opt_sec_err, NULL }
198 };
199
200
201 static void nfs_umount_begin(struct super_block *);
202 static int nfs_statfs(struct dentry *, struct kstatfs *);
203 static int nfs_show_options(struct seq_file *, struct vfsmount *);
204 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
207 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
208 static void nfs_kill_super(struct super_block *);
209 static void nfs_put_super(struct super_block *);
210 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
211
212 static struct file_system_type nfs_fs_type = {
213 .owner = THIS_MODULE,
214 .name = "nfs",
215 .get_sb = nfs_get_sb,
216 .kill_sb = nfs_kill_super,
217 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
218 };
219
220 struct file_system_type nfs_xdev_fs_type = {
221 .owner = THIS_MODULE,
222 .name = "nfs",
223 .get_sb = nfs_xdev_get_sb,
224 .kill_sb = nfs_kill_super,
225 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
226 };
227
228 static const struct super_operations nfs_sops = {
229 .alloc_inode = nfs_alloc_inode,
230 .destroy_inode = nfs_destroy_inode,
231 .write_inode = nfs_write_inode,
232 .put_super = nfs_put_super,
233 .statfs = nfs_statfs,
234 .clear_inode = nfs_clear_inode,
235 .umount_begin = nfs_umount_begin,
236 .show_options = nfs_show_options,
237 .show_stats = nfs_show_stats,
238 .remount_fs = nfs_remount,
239 };
240
241 #ifdef CONFIG_NFS_V4
242 static int nfs4_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
247 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
248 static void nfs4_kill_super(struct super_block *sb);
249
250 static struct file_system_type nfs4_fs_type = {
251 .owner = THIS_MODULE,
252 .name = "nfs4",
253 .get_sb = nfs4_get_sb,
254 .kill_sb = nfs4_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
256 };
257
258 struct file_system_type nfs4_xdev_fs_type = {
259 .owner = THIS_MODULE,
260 .name = "nfs4",
261 .get_sb = nfs4_xdev_get_sb,
262 .kill_sb = nfs4_kill_super,
263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
264 };
265
266 struct file_system_type nfs4_referral_fs_type = {
267 .owner = THIS_MODULE,
268 .name = "nfs4",
269 .get_sb = nfs4_referral_get_sb,
270 .kill_sb = nfs4_kill_super,
271 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
272 };
273
274 static const struct super_operations nfs4_sops = {
275 .alloc_inode = nfs_alloc_inode,
276 .destroy_inode = nfs_destroy_inode,
277 .write_inode = nfs_write_inode,
278 .statfs = nfs_statfs,
279 .clear_inode = nfs4_clear_inode,
280 .umount_begin = nfs_umount_begin,
281 .show_options = nfs_show_options,
282 .show_stats = nfs_show_stats,
283 .remount_fs = nfs_remount,
284 };
285 #endif
286
287 static struct shrinker acl_shrinker = {
288 .shrink = nfs_access_cache_shrinker,
289 .seeks = DEFAULT_SEEKS,
290 };
291
292 /*
293 * Register the NFS filesystems
294 */
295 int __init register_nfs_fs(void)
296 {
297 int ret;
298
299 ret = register_filesystem(&nfs_fs_type);
300 if (ret < 0)
301 goto error_0;
302
303 ret = nfs_register_sysctl();
304 if (ret < 0)
305 goto error_1;
306 #ifdef CONFIG_NFS_V4
307 ret = register_filesystem(&nfs4_fs_type);
308 if (ret < 0)
309 goto error_2;
310 #endif
311 register_shrinker(&acl_shrinker);
312 return 0;
313
314 #ifdef CONFIG_NFS_V4
315 error_2:
316 nfs_unregister_sysctl();
317 #endif
318 error_1:
319 unregister_filesystem(&nfs_fs_type);
320 error_0:
321 return ret;
322 }
323
324 /*
325 * Unregister the NFS filesystems
326 */
327 void __exit unregister_nfs_fs(void)
328 {
329 unregister_shrinker(&acl_shrinker);
330 #ifdef CONFIG_NFS_V4
331 unregister_filesystem(&nfs4_fs_type);
332 #endif
333 nfs_unregister_sysctl();
334 unregister_filesystem(&nfs_fs_type);
335 }
336
337 void nfs_sb_active(struct nfs_server *server)
338 {
339 atomic_inc(&server->active);
340 }
341
342 void nfs_sb_deactive(struct nfs_server *server)
343 {
344 if (atomic_dec_and_test(&server->active))
345 wake_up(&server->active_wq);
346 }
347
348 static void nfs_put_super(struct super_block *sb)
349 {
350 struct nfs_server *server = NFS_SB(sb);
351 /*
352 * Make sure there are no outstanding ops to this server.
353 * If so, wait for them to finish before allowing the
354 * unmount to continue.
355 */
356 wait_event(server->active_wq, atomic_read(&server->active) == 0);
357 }
358
359 /*
360 * Deliver file system statistics to userspace
361 */
362 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
363 {
364 struct nfs_server *server = NFS_SB(dentry->d_sb);
365 unsigned char blockbits;
366 unsigned long blockres;
367 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
368 struct nfs_fattr fattr;
369 struct nfs_fsstat res = {
370 .fattr = &fattr,
371 };
372 int error;
373
374 lock_kernel();
375
376 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
377 if (error < 0)
378 goto out_err;
379 buf->f_type = NFS_SUPER_MAGIC;
380
381 /*
382 * Current versions of glibc do not correctly handle the
383 * case where f_frsize != f_bsize. Eventually we want to
384 * report the value of wtmult in this field.
385 */
386 buf->f_frsize = dentry->d_sb->s_blocksize;
387
388 /*
389 * On most *nix systems, f_blocks, f_bfree, and f_bavail
390 * are reported in units of f_frsize. Linux hasn't had
391 * an f_frsize field in its statfs struct until recently,
392 * thus historically Linux's sys_statfs reports these
393 * fields in units of f_bsize.
394 */
395 buf->f_bsize = dentry->d_sb->s_blocksize;
396 blockbits = dentry->d_sb->s_blocksize_bits;
397 blockres = (1 << blockbits) - 1;
398 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
399 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
400 buf->f_bavail = (res.abytes + blockres) >> blockbits;
401
402 buf->f_files = res.tfiles;
403 buf->f_ffree = res.afiles;
404
405 buf->f_namelen = server->namelen;
406
407 unlock_kernel();
408 return 0;
409
410 out_err:
411 dprintk("%s: statfs error = %d\n", __func__, -error);
412 unlock_kernel();
413 return error;
414 }
415
416 /*
417 * Map the security flavour number to a name
418 */
419 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
420 {
421 static const struct {
422 rpc_authflavor_t flavour;
423 const char *str;
424 } sec_flavours[] = {
425 { RPC_AUTH_NULL, "null" },
426 { RPC_AUTH_UNIX, "sys" },
427 { RPC_AUTH_GSS_KRB5, "krb5" },
428 { RPC_AUTH_GSS_KRB5I, "krb5i" },
429 { RPC_AUTH_GSS_KRB5P, "krb5p" },
430 { RPC_AUTH_GSS_LKEY, "lkey" },
431 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
432 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
433 { RPC_AUTH_GSS_SPKM, "spkm" },
434 { RPC_AUTH_GSS_SPKMI, "spkmi" },
435 { RPC_AUTH_GSS_SPKMP, "spkmp" },
436 { UINT_MAX, "unknown" }
437 };
438 int i;
439
440 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
441 if (sec_flavours[i].flavour == flavour)
442 break;
443 }
444 return sec_flavours[i].str;
445 }
446
447 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
448 int showdefaults)
449 {
450 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
451
452 switch (sap->sa_family) {
453 case AF_INET: {
454 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
455 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
456 NIPQUAD(sin->sin_addr.s_addr));
457 break;
458 }
459 case AF_INET6: {
460 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
461 seq_printf(m, ",mountaddr=" NIP6_FMT,
462 NIP6(sin6->sin6_addr));
463 break;
464 }
465 default:
466 if (showdefaults)
467 seq_printf(m, ",mountaddr=unspecified");
468 }
469
470 if (nfss->mountd_version || showdefaults)
471 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
472 if (nfss->mountd_port || showdefaults)
473 seq_printf(m, ",mountport=%u", nfss->mountd_port);
474
475 switch (nfss->mountd_protocol) {
476 case IPPROTO_UDP:
477 seq_printf(m, ",mountproto=udp");
478 break;
479 case IPPROTO_TCP:
480 seq_printf(m, ",mountproto=tcp");
481 break;
482 default:
483 if (showdefaults)
484 seq_printf(m, ",mountproto=auto");
485 }
486 }
487
488 /*
489 * Describe the mount options in force on this server representation
490 */
491 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
492 int showdefaults)
493 {
494 static const struct proc_nfs_info {
495 int flag;
496 const char *str;
497 const char *nostr;
498 } nfs_info[] = {
499 { NFS_MOUNT_SOFT, ",soft", ",hard" },
500 { NFS_MOUNT_INTR, ",intr", ",nointr" },
501 { NFS_MOUNT_POSIX, ",posix", "" },
502 { NFS_MOUNT_NOCTO, ",nocto", "" },
503 { NFS_MOUNT_NOAC, ",noac", "" },
504 { NFS_MOUNT_NONLM, ",nolock", "" },
505 { NFS_MOUNT_NOACL, ",noacl", "" },
506 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
507 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
508 { 0, NULL, NULL }
509 };
510 const struct proc_nfs_info *nfs_infop;
511 struct nfs_client *clp = nfss->nfs_client;
512 u32 version = clp->rpc_ops->version;
513
514 seq_printf(m, ",vers=%u", version);
515 seq_printf(m, ",rsize=%u", nfss->rsize);
516 seq_printf(m, ",wsize=%u", nfss->wsize);
517 if (nfss->bsize != 0)
518 seq_printf(m, ",bsize=%u", nfss->bsize);
519 seq_printf(m, ",namlen=%u", nfss->namelen);
520 if (nfss->acregmin != 3*HZ || showdefaults)
521 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
522 if (nfss->acregmax != 60*HZ || showdefaults)
523 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
524 if (nfss->acdirmin != 30*HZ || showdefaults)
525 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
526 if (nfss->acdirmax != 60*HZ || showdefaults)
527 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
528 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
529 if (nfss->flags & nfs_infop->flag)
530 seq_puts(m, nfs_infop->str);
531 else
532 seq_puts(m, nfs_infop->nostr);
533 }
534 seq_printf(m, ",proto=%s",
535 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
536 if (version == 4) {
537 if (nfss->port != NFS_PORT)
538 seq_printf(m, ",port=%u", nfss->port);
539 } else
540 if (nfss->port)
541 seq_printf(m, ",port=%u", nfss->port);
542
543 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
544 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
545 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
546
547 if (version != 4)
548 nfs_show_mountd_options(m, nfss, showdefaults);
549
550 #ifdef CONFIG_NFS_V4
551 if (clp->rpc_ops->version == 4)
552 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
553 #endif
554 }
555
556 /*
557 * Describe the mount options on this VFS mountpoint
558 */
559 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
560 {
561 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
562
563 nfs_show_mount_options(m, nfss, 0);
564
565 seq_printf(m, ",addr=%s",
566 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
567 RPC_DISPLAY_ADDR));
568
569 return 0;
570 }
571
572 /*
573 * Present statistical information for this VFS mountpoint
574 */
575 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
576 {
577 int i, cpu;
578 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
579 struct rpc_auth *auth = nfss->client->cl_auth;
580 struct nfs_iostats totals = { };
581
582 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
583
584 /*
585 * Display all mount option settings
586 */
587 seq_printf(m, "\n\topts:\t");
588 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
592 nfs_show_mount_options(m, nfss, 1);
593
594 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
595
596 seq_printf(m, "\n\tcaps:\t");
597 seq_printf(m, "caps=0x%x", nfss->caps);
598 seq_printf(m, ",wtmult=%u", nfss->wtmult);
599 seq_printf(m, ",dtsize=%u", nfss->dtsize);
600 seq_printf(m, ",bsize=%u", nfss->bsize);
601 seq_printf(m, ",namlen=%u", nfss->namelen);
602
603 #ifdef CONFIG_NFS_V4
604 if (nfss->nfs_client->rpc_ops->version == 4) {
605 seq_printf(m, "\n\tnfsv4:\t");
606 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
607 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
608 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
609 }
610 #endif
611
612 /*
613 * Display security flavor in effect for this mount
614 */
615 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
616 if (auth->au_flavor)
617 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
618
619 /*
620 * Display superblock I/O counters
621 */
622 for_each_possible_cpu(cpu) {
623 struct nfs_iostats *stats;
624
625 preempt_disable();
626 stats = per_cpu_ptr(nfss->io_stats, cpu);
627
628 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
629 totals.events[i] += stats->events[i];
630 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
631 totals.bytes[i] += stats->bytes[i];
632
633 preempt_enable();
634 }
635
636 seq_printf(m, "\n\tevents:\t");
637 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
638 seq_printf(m, "%lu ", totals.events[i]);
639 seq_printf(m, "\n\tbytes:\t");
640 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
641 seq_printf(m, "%Lu ", totals.bytes[i]);
642 seq_printf(m, "\n");
643
644 rpc_print_iostats(m, nfss->client);
645
646 return 0;
647 }
648
649 /*
650 * Begin unmount by attempting to remove all automounted mountpoints we added
651 * in response to xdev traversals and referrals
652 */
653 static void nfs_umount_begin(struct super_block *sb)
654 {
655 struct nfs_server *server = NFS_SB(sb);
656 struct rpc_clnt *rpc;
657
658 /* -EIO all pending I/O */
659 rpc = server->client_acl;
660 if (!IS_ERR(rpc))
661 rpc_killall_tasks(rpc);
662 rpc = server->client;
663 if (!IS_ERR(rpc))
664 rpc_killall_tasks(rpc);
665 }
666
667 /*
668 * Set the port number in an address. Be agnostic about the address family.
669 */
670 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
671 {
672 switch (sap->sa_family) {
673 case AF_INET: {
674 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
675 ap->sin_port = htons(port);
676 break;
677 }
678 case AF_INET6: {
679 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
680 ap->sin6_port = htons(port);
681 break;
682 }
683 }
684 }
685
686 /*
687 * Sanity-check a server address provided by the mount command.
688 *
689 * Address family must be initialized, and address must not be
690 * the ANY address for that family.
691 */
692 static int nfs_verify_server_address(struct sockaddr *addr)
693 {
694 switch (addr->sa_family) {
695 case AF_INET: {
696 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
697 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
698 }
699 case AF_INET6: {
700 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
701 return !ipv6_addr_any(sa);
702 }
703 }
704
705 return 0;
706 }
707
708 /*
709 * Parse string addresses passed in via a mount option,
710 * and construct a sockaddr based on the result.
711 *
712 * If address parsing fails, set the sockaddr's address
713 * family to AF_UNSPEC to force nfs_verify_server_address()
714 * to punt the mount.
715 */
716 static void nfs_parse_server_address(char *value,
717 struct sockaddr *sap,
718 size_t *len)
719 {
720 if (strchr(value, ':')) {
721 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
722 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
723
724 ap->sin6_family = AF_INET6;
725 *len = sizeof(*ap);
726 if (in6_pton(value, -1, addr, '\0', NULL))
727 return;
728 } else {
729 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
730 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
731
732 ap->sin_family = AF_INET;
733 *len = sizeof(*ap);
734 if (in4_pton(value, -1, addr, '\0', NULL))
735 return;
736 }
737
738 sap->sa_family = AF_UNSPEC;
739 *len = 0;
740 }
741
742 /*
743 * Error-check and convert a string of mount options from user space into
744 * a data structure
745 */
746 static int nfs_parse_mount_options(char *raw,
747 struct nfs_parsed_mount_data *mnt)
748 {
749 char *p, *string, *secdata;
750 int rc;
751
752 if (!raw) {
753 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
754 return 1;
755 }
756 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
757
758 secdata = alloc_secdata();
759 if (!secdata)
760 goto out_nomem;
761
762 rc = security_sb_copy_data(raw, secdata);
763 if (rc)
764 goto out_security_failure;
765
766 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
767 if (rc)
768 goto out_security_failure;
769
770 free_secdata(secdata);
771
772 while ((p = strsep(&raw, ",")) != NULL) {
773 substring_t args[MAX_OPT_ARGS];
774 int option, token;
775
776 if (!*p)
777 continue;
778
779 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
780
781 token = match_token(p, nfs_mount_option_tokens, args);
782 switch (token) {
783 case Opt_soft:
784 mnt->flags |= NFS_MOUNT_SOFT;
785 break;
786 case Opt_hard:
787 mnt->flags &= ~NFS_MOUNT_SOFT;
788 break;
789 case Opt_posix:
790 mnt->flags |= NFS_MOUNT_POSIX;
791 break;
792 case Opt_noposix:
793 mnt->flags &= ~NFS_MOUNT_POSIX;
794 break;
795 case Opt_cto:
796 mnt->flags &= ~NFS_MOUNT_NOCTO;
797 break;
798 case Opt_nocto:
799 mnt->flags |= NFS_MOUNT_NOCTO;
800 break;
801 case Opt_ac:
802 mnt->flags &= ~NFS_MOUNT_NOAC;
803 break;
804 case Opt_noac:
805 mnt->flags |= NFS_MOUNT_NOAC;
806 break;
807 case Opt_lock:
808 mnt->flags &= ~NFS_MOUNT_NONLM;
809 break;
810 case Opt_nolock:
811 mnt->flags |= NFS_MOUNT_NONLM;
812 break;
813 case Opt_v2:
814 mnt->flags &= ~NFS_MOUNT_VER3;
815 break;
816 case Opt_v3:
817 mnt->flags |= NFS_MOUNT_VER3;
818 break;
819 case Opt_udp:
820 mnt->flags &= ~NFS_MOUNT_TCP;
821 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
822 mnt->timeo = 7;
823 mnt->retrans = 5;
824 break;
825 case Opt_tcp:
826 mnt->flags |= NFS_MOUNT_TCP;
827 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
828 mnt->timeo = 600;
829 mnt->retrans = 2;
830 break;
831 case Opt_rdma:
832 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
833 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
834 mnt->timeo = 600;
835 mnt->retrans = 2;
836 break;
837 case Opt_acl:
838 mnt->flags &= ~NFS_MOUNT_NOACL;
839 break;
840 case Opt_noacl:
841 mnt->flags |= NFS_MOUNT_NOACL;
842 break;
843 case Opt_rdirplus:
844 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
845 break;
846 case Opt_nordirplus:
847 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
848 break;
849 case Opt_sharecache:
850 mnt->flags &= ~NFS_MOUNT_UNSHARED;
851 break;
852 case Opt_nosharecache:
853 mnt->flags |= NFS_MOUNT_UNSHARED;
854 break;
855
856 case Opt_port:
857 if (match_int(args, &option))
858 return 0;
859 if (option < 0 || option > 65535)
860 return 0;
861 mnt->nfs_server.port = option;
862 break;
863 case Opt_rsize:
864 if (match_int(args, &mnt->rsize))
865 return 0;
866 break;
867 case Opt_wsize:
868 if (match_int(args, &mnt->wsize))
869 return 0;
870 break;
871 case Opt_bsize:
872 if (match_int(args, &option))
873 return 0;
874 if (option < 0)
875 return 0;
876 mnt->bsize = option;
877 break;
878 case Opt_timeo:
879 if (match_int(args, &mnt->timeo))
880 return 0;
881 break;
882 case Opt_retrans:
883 if (match_int(args, &mnt->retrans))
884 return 0;
885 break;
886 case Opt_acregmin:
887 if (match_int(args, &mnt->acregmin))
888 return 0;
889 break;
890 case Opt_acregmax:
891 if (match_int(args, &mnt->acregmax))
892 return 0;
893 break;
894 case Opt_acdirmin:
895 if (match_int(args, &mnt->acdirmin))
896 return 0;
897 break;
898 case Opt_acdirmax:
899 if (match_int(args, &mnt->acdirmax))
900 return 0;
901 break;
902 case Opt_actimeo:
903 if (match_int(args, &option))
904 return 0;
905 if (option < 0)
906 return 0;
907 mnt->acregmin =
908 mnt->acregmax =
909 mnt->acdirmin =
910 mnt->acdirmax = option;
911 break;
912 case Opt_namelen:
913 if (match_int(args, &mnt->namlen))
914 return 0;
915 break;
916 case Opt_mountport:
917 if (match_int(args, &option))
918 return 0;
919 if (option < 0 || option > 65535)
920 return 0;
921 mnt->mount_server.port = option;
922 break;
923 case Opt_mountvers:
924 if (match_int(args, &option))
925 return 0;
926 if (option < 0)
927 return 0;
928 mnt->mount_server.version = option;
929 break;
930 case Opt_nfsvers:
931 if (match_int(args, &option))
932 return 0;
933 switch (option) {
934 case 2:
935 mnt->flags &= ~NFS_MOUNT_VER3;
936 break;
937 case 3:
938 mnt->flags |= NFS_MOUNT_VER3;
939 break;
940 default:
941 goto out_unrec_vers;
942 }
943 break;
944
945 case Opt_sec:
946 string = match_strdup(args);
947 if (string == NULL)
948 goto out_nomem;
949 token = match_token(string, nfs_secflavor_tokens, args);
950 kfree(string);
951
952 /*
953 * The flags setting is for v2/v3. The flavor_len
954 * setting is for v4. v2/v3 also need to know the
955 * difference between NULL and UNIX.
956 */
957 switch (token) {
958 case Opt_sec_none:
959 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
960 mnt->auth_flavor_len = 0;
961 mnt->auth_flavors[0] = RPC_AUTH_NULL;
962 break;
963 case Opt_sec_sys:
964 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
965 mnt->auth_flavor_len = 0;
966 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
967 break;
968 case Opt_sec_krb5:
969 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
970 mnt->auth_flavor_len = 1;
971 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
972 break;
973 case Opt_sec_krb5i:
974 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
975 mnt->auth_flavor_len = 1;
976 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
977 break;
978 case Opt_sec_krb5p:
979 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
980 mnt->auth_flavor_len = 1;
981 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
982 break;
983 case Opt_sec_lkey:
984 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
985 mnt->auth_flavor_len = 1;
986 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
987 break;
988 case Opt_sec_lkeyi:
989 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
990 mnt->auth_flavor_len = 1;
991 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
992 break;
993 case Opt_sec_lkeyp:
994 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
995 mnt->auth_flavor_len = 1;
996 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
997 break;
998 case Opt_sec_spkm:
999 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1000 mnt->auth_flavor_len = 1;
1001 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1002 break;
1003 case Opt_sec_spkmi:
1004 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1005 mnt->auth_flavor_len = 1;
1006 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1007 break;
1008 case Opt_sec_spkmp:
1009 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1010 mnt->auth_flavor_len = 1;
1011 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1012 break;
1013 default:
1014 goto out_unrec_sec;
1015 }
1016 break;
1017 case Opt_proto:
1018 string = match_strdup(args);
1019 if (string == NULL)
1020 goto out_nomem;
1021 token = match_token(string,
1022 nfs_xprt_protocol_tokens, args);
1023 kfree(string);
1024
1025 switch (token) {
1026 case Opt_xprt_udp:
1027 mnt->flags &= ~NFS_MOUNT_TCP;
1028 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1029 mnt->timeo = 7;
1030 mnt->retrans = 5;
1031 break;
1032 case Opt_xprt_tcp:
1033 mnt->flags |= NFS_MOUNT_TCP;
1034 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1035 mnt->timeo = 600;
1036 mnt->retrans = 2;
1037 break;
1038 case Opt_xprt_rdma:
1039 /* vector side protocols to TCP */
1040 mnt->flags |= NFS_MOUNT_TCP;
1041 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1042 mnt->timeo = 600;
1043 mnt->retrans = 2;
1044 break;
1045 default:
1046 goto out_unrec_xprt;
1047 }
1048 break;
1049 case Opt_mountproto:
1050 string = match_strdup(args);
1051 if (string == NULL)
1052 goto out_nomem;
1053 token = match_token(string,
1054 nfs_xprt_protocol_tokens, args);
1055 kfree(string);
1056
1057 switch (token) {
1058 case Opt_xprt_udp:
1059 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1060 break;
1061 case Opt_xprt_tcp:
1062 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1063 break;
1064 case Opt_xprt_rdma: /* not used for side protocols */
1065 default:
1066 goto out_unrec_xprt;
1067 }
1068 break;
1069 case Opt_addr:
1070 string = match_strdup(args);
1071 if (string == NULL)
1072 goto out_nomem;
1073 nfs_parse_server_address(string, (struct sockaddr *)
1074 &mnt->nfs_server.address,
1075 &mnt->nfs_server.addrlen);
1076 kfree(string);
1077 break;
1078 case Opt_clientaddr:
1079 string = match_strdup(args);
1080 if (string == NULL)
1081 goto out_nomem;
1082 kfree(mnt->client_address);
1083 mnt->client_address = string;
1084 break;
1085 case Opt_mounthost:
1086 string = match_strdup(args);
1087 if (string == NULL)
1088 goto out_nomem;
1089 kfree(mnt->mount_server.hostname);
1090 mnt->mount_server.hostname = string;
1091 break;
1092 case Opt_mountaddr:
1093 string = match_strdup(args);
1094 if (string == NULL)
1095 goto out_nomem;
1096 nfs_parse_server_address(string, (struct sockaddr *)
1097 &mnt->mount_server.address,
1098 &mnt->mount_server.addrlen);
1099 kfree(string);
1100 break;
1101
1102 case Opt_userspace:
1103 case Opt_deprecated:
1104 dfprintk(MOUNT, "NFS: ignoring mount option "
1105 "'%s'\n", p);
1106 break;
1107
1108 default:
1109 goto out_unknown;
1110 }
1111 }
1112
1113 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1114 mnt->nfs_server.port);
1115
1116 return 1;
1117
1118 out_nomem:
1119 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1120 return 0;
1121 out_security_failure:
1122 free_secdata(secdata);
1123 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1124 return 0;
1125 out_unrec_vers:
1126 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1127 return 0;
1128
1129 out_unrec_xprt:
1130 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1131 return 0;
1132
1133 out_unrec_sec:
1134 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1135 return 0;
1136
1137 out_unknown:
1138 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1139 return 0;
1140 }
1141
1142 /*
1143 * Use the remote server's MOUNT service to request the NFS file handle
1144 * corresponding to the provided path.
1145 */
1146 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1147 struct nfs_fh *root_fh)
1148 {
1149 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1150 char *hostname;
1151 int status;
1152
1153 if (args->mount_server.version == 0) {
1154 if (args->flags & NFS_MOUNT_VER3)
1155 args->mount_server.version = NFS_MNT3_VERSION;
1156 else
1157 args->mount_server.version = NFS_MNT_VERSION;
1158 }
1159
1160 if (args->mount_server.hostname)
1161 hostname = args->mount_server.hostname;
1162 else
1163 hostname = args->nfs_server.hostname;
1164
1165 /*
1166 * Construct the mount server's address.
1167 */
1168 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1169 memcpy(sap, &args->nfs_server.address,
1170 args->nfs_server.addrlen);
1171 args->mount_server.addrlen = args->nfs_server.addrlen;
1172 }
1173
1174 /*
1175 * autobind will be used if mount_server.port == 0
1176 */
1177 nfs_set_port(sap, args->mount_server.port);
1178
1179 /*
1180 * Now ask the mount server to map our export path
1181 * to a file handle.
1182 */
1183 status = nfs_mount(sap,
1184 args->mount_server.addrlen,
1185 hostname,
1186 args->nfs_server.export_path,
1187 args->mount_server.version,
1188 args->mount_server.protocol,
1189 root_fh);
1190 if (status == 0)
1191 return 0;
1192
1193 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1194 hostname, status);
1195 return status;
1196 }
1197
1198 /*
1199 * Validate the NFS2/NFS3 mount data
1200 * - fills in the mount root filehandle
1201 *
1202 * For option strings, user space handles the following behaviors:
1203 *
1204 * + DNS: mapping server host name to IP address ("addr=" option)
1205 *
1206 * + failure mode: how to behave if a mount request can't be handled
1207 * immediately ("fg/bg" option)
1208 *
1209 * + retry: how often to retry a mount request ("retry=" option)
1210 *
1211 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1212 * mountproto=tcp after mountproto=udp, and so on
1213 */
1214 static int nfs_validate_mount_data(void *options,
1215 struct nfs_parsed_mount_data *args,
1216 struct nfs_fh *mntfh,
1217 const char *dev_name)
1218 {
1219 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1220
1221 if (data == NULL)
1222 goto out_no_data;
1223
1224 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1225 args->rsize = NFS_MAX_FILE_IO_SIZE;
1226 args->wsize = NFS_MAX_FILE_IO_SIZE;
1227 args->timeo = 600;
1228 args->retrans = 2;
1229 args->acregmin = 3;
1230 args->acregmax = 60;
1231 args->acdirmin = 30;
1232 args->acdirmax = 60;
1233 args->mount_server.port = 0; /* autobind unless user sets port */
1234 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1235 args->nfs_server.port = 0; /* autobind unless user sets port */
1236 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1237
1238 switch (data->version) {
1239 case 1:
1240 data->namlen = 0;
1241 case 2:
1242 data->bsize = 0;
1243 case 3:
1244 if (data->flags & NFS_MOUNT_VER3)
1245 goto out_no_v3;
1246 data->root.size = NFS2_FHSIZE;
1247 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1248 case 4:
1249 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1250 goto out_no_sec;
1251 case 5:
1252 memset(data->context, 0, sizeof(data->context));
1253 case 6:
1254 if (data->flags & NFS_MOUNT_VER3) {
1255 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1256 goto out_invalid_fh;
1257 mntfh->size = data->root.size;
1258 } else
1259 mntfh->size = NFS2_FHSIZE;
1260
1261
1262 memcpy(mntfh->data, data->root.data, mntfh->size);
1263 if (mntfh->size < sizeof(mntfh->data))
1264 memset(mntfh->data + mntfh->size, 0,
1265 sizeof(mntfh->data) - mntfh->size);
1266
1267 /*
1268 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1269 * can deal with.
1270 */
1271 args->flags = data->flags;
1272 args->rsize = data->rsize;
1273 args->wsize = data->wsize;
1274 args->timeo = data->timeo;
1275 args->retrans = data->retrans;
1276 args->acregmin = data->acregmin;
1277 args->acregmax = data->acregmax;
1278 args->acdirmin = data->acdirmin;
1279 args->acdirmax = data->acdirmax;
1280
1281 memcpy(&args->nfs_server.address, &data->addr,
1282 sizeof(data->addr));
1283 args->nfs_server.addrlen = sizeof(data->addr);
1284 if (!nfs_verify_server_address((struct sockaddr *)
1285 &args->nfs_server.address))
1286 goto out_no_address;
1287
1288 if (!(data->flags & NFS_MOUNT_TCP))
1289 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1290 /* N.B. caller will free nfs_server.hostname in all cases */
1291 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1292 args->namlen = data->namlen;
1293 args->bsize = data->bsize;
1294 args->auth_flavors[0] = data->pseudoflavor;
1295 if (!args->nfs_server.hostname)
1296 goto out_nomem;
1297
1298 /*
1299 * The legacy version 6 binary mount data from userspace has a
1300 * field used only to transport selinux information into the
1301 * the kernel. To continue to support that functionality we
1302 * have a touch of selinux knowledge here in the NFS code. The
1303 * userspace code converted context=blah to just blah so we are
1304 * converting back to the full string selinux understands.
1305 */
1306 if (data->context[0]){
1307 #ifdef CONFIG_SECURITY_SELINUX
1308 int rc;
1309 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1310 if (!opts_str)
1311 return -ENOMEM;
1312 strcpy(opts_str, "context=");
1313 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1314 strcat(opts_str, &data->context[0]);
1315 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1316 kfree(opts_str);
1317 if (rc)
1318 return rc;
1319 #else
1320 return -EINVAL;
1321 #endif
1322 }
1323
1324 break;
1325 default: {
1326 unsigned int len;
1327 char *c;
1328 int status;
1329
1330 if (nfs_parse_mount_options((char *)options, args) == 0)
1331 return -EINVAL;
1332
1333 if (!nfs_verify_server_address((struct sockaddr *)
1334 &args->nfs_server.address))
1335 goto out_no_address;
1336
1337 c = strchr(dev_name, ':');
1338 if (c == NULL)
1339 return -EINVAL;
1340 len = c - dev_name;
1341 /* N.B. caller will free nfs_server.hostname in all cases */
1342 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1343 if (!args->nfs_server.hostname)
1344 goto out_nomem;
1345
1346 c++;
1347 if (strlen(c) > NFS_MAXPATHLEN)
1348 return -ENAMETOOLONG;
1349 args->nfs_server.export_path = c;
1350
1351 status = nfs_try_mount(args, mntfh);
1352 if (status)
1353 return status;
1354
1355 break;
1356 }
1357 }
1358
1359 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1360 args->auth_flavors[0] = RPC_AUTH_UNIX;
1361
1362 #ifndef CONFIG_NFS_V3
1363 if (args->flags & NFS_MOUNT_VER3)
1364 goto out_v3_not_compiled;
1365 #endif /* !CONFIG_NFS_V3 */
1366
1367 return 0;
1368
1369 out_no_data:
1370 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1371 return -EINVAL;
1372
1373 out_no_v3:
1374 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1375 data->version);
1376 return -EINVAL;
1377
1378 out_no_sec:
1379 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1380 return -EINVAL;
1381
1382 #ifndef CONFIG_NFS_V3
1383 out_v3_not_compiled:
1384 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1385 return -EPROTONOSUPPORT;
1386 #endif /* !CONFIG_NFS_V3 */
1387
1388 out_nomem:
1389 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1390 return -ENOMEM;
1391
1392 out_no_address:
1393 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1394 return -EINVAL;
1395
1396 out_invalid_fh:
1397 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1398 return -EINVAL;
1399 }
1400
1401 static int
1402 nfs_compare_remount_data(struct nfs_server *nfss,
1403 struct nfs_parsed_mount_data *data)
1404 {
1405 if (data->flags != nfss->flags ||
1406 data->rsize != nfss->rsize ||
1407 data->wsize != nfss->wsize ||
1408 data->retrans != nfss->client->cl_timeout->to_retries ||
1409 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1410 data->acregmin != nfss->acregmin / HZ ||
1411 data->acregmax != nfss->acregmax / HZ ||
1412 data->acdirmin != nfss->acdirmin / HZ ||
1413 data->acdirmax != nfss->acdirmax / HZ ||
1414 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1415 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1416 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1417 data->nfs_server.addrlen) != 0)
1418 return -EINVAL;
1419
1420 return 0;
1421 }
1422
1423 static int
1424 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1425 {
1426 int error;
1427 struct nfs_server *nfss = sb->s_fs_info;
1428 struct nfs_parsed_mount_data *data;
1429 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1430 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1431
1432 /*
1433 * Userspace mount programs that send binary options generally send
1434 * them populated with default values. We have no way to know which
1435 * ones were explicitly specified. Fall back to legacy behavior and
1436 * just return success.
1437 */
1438 if ((sb->s_type == &nfs4_fs_type && options4->version == 1) ||
1439 (sb->s_type == &nfs_fs_type && options->version >= 1 &&
1440 options->version <= 6))
1441 return 0;
1442
1443 data = kzalloc(sizeof(*data), GFP_KERNEL);
1444 if (data == NULL)
1445 return -ENOMEM;
1446
1447 /* fill out struct with values from existing mount */
1448 data->flags = nfss->flags;
1449 data->rsize = nfss->rsize;
1450 data->wsize = nfss->wsize;
1451 data->retrans = nfss->client->cl_timeout->to_retries;
1452 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1453 data->acregmin = nfss->acregmin / HZ;
1454 data->acregmax = nfss->acregmax / HZ;
1455 data->acdirmin = nfss->acdirmin / HZ;
1456 data->acdirmax = nfss->acdirmax / HZ;
1457 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1458 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1459 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1460 data->nfs_server.addrlen);
1461
1462 /* overwrite those values with any that were specified */
1463 error = nfs_parse_mount_options((char *)options, data);
1464 if (error < 0)
1465 goto out;
1466
1467 /* compare new mount options with old ones */
1468 error = nfs_compare_remount_data(nfss, data);
1469 out:
1470 kfree(data);
1471 return error;
1472 }
1473
1474 /*
1475 * Initialise the common bits of the superblock
1476 */
1477 static inline void nfs_initialise_sb(struct super_block *sb)
1478 {
1479 struct nfs_server *server = NFS_SB(sb);
1480
1481 sb->s_magic = NFS_SUPER_MAGIC;
1482
1483 /* We probably want something more informative here */
1484 snprintf(sb->s_id, sizeof(sb->s_id),
1485 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1486
1487 if (sb->s_blocksize == 0)
1488 sb->s_blocksize = nfs_block_bits(server->wsize,
1489 &sb->s_blocksize_bits);
1490
1491 if (server->flags & NFS_MOUNT_NOAC)
1492 sb->s_flags |= MS_SYNCHRONOUS;
1493
1494 nfs_super_set_maxbytes(sb, server->maxfilesize);
1495 }
1496
1497 /*
1498 * Finish setting up an NFS2/3 superblock
1499 */
1500 static void nfs_fill_super(struct super_block *sb,
1501 struct nfs_parsed_mount_data *data)
1502 {
1503 struct nfs_server *server = NFS_SB(sb);
1504
1505 sb->s_blocksize_bits = 0;
1506 sb->s_blocksize = 0;
1507 if (data->bsize)
1508 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1509
1510 if (server->flags & NFS_MOUNT_VER3) {
1511 /* The VFS shouldn't apply the umask to mode bits. We will do
1512 * so ourselves when necessary.
1513 */
1514 sb->s_flags |= MS_POSIXACL;
1515 sb->s_time_gran = 1;
1516 }
1517
1518 sb->s_op = &nfs_sops;
1519 nfs_initialise_sb(sb);
1520 }
1521
1522 /*
1523 * Finish setting up a cloned NFS2/3 superblock
1524 */
1525 static void nfs_clone_super(struct super_block *sb,
1526 const struct super_block *old_sb)
1527 {
1528 struct nfs_server *server = NFS_SB(sb);
1529
1530 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1531 sb->s_blocksize = old_sb->s_blocksize;
1532 sb->s_maxbytes = old_sb->s_maxbytes;
1533
1534 if (server->flags & NFS_MOUNT_VER3) {
1535 /* The VFS shouldn't apply the umask to mode bits. We will do
1536 * so ourselves when necessary.
1537 */
1538 sb->s_flags |= MS_POSIXACL;
1539 sb->s_time_gran = 1;
1540 }
1541
1542 sb->s_op = old_sb->s_op;
1543 nfs_initialise_sb(sb);
1544 }
1545
1546 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1547
1548 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1549 {
1550 const struct nfs_server *a = s->s_fs_info;
1551 const struct rpc_clnt *clnt_a = a->client;
1552 const struct rpc_clnt *clnt_b = b->client;
1553
1554 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1555 goto Ebusy;
1556 if (a->nfs_client != b->nfs_client)
1557 goto Ebusy;
1558 if (a->flags != b->flags)
1559 goto Ebusy;
1560 if (a->wsize != b->wsize)
1561 goto Ebusy;
1562 if (a->rsize != b->rsize)
1563 goto Ebusy;
1564 if (a->acregmin != b->acregmin)
1565 goto Ebusy;
1566 if (a->acregmax != b->acregmax)
1567 goto Ebusy;
1568 if (a->acdirmin != b->acdirmin)
1569 goto Ebusy;
1570 if (a->acdirmax != b->acdirmax)
1571 goto Ebusy;
1572 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1573 goto Ebusy;
1574 return 1;
1575 Ebusy:
1576 return 0;
1577 }
1578
1579 struct nfs_sb_mountdata {
1580 struct nfs_server *server;
1581 int mntflags;
1582 };
1583
1584 static int nfs_set_super(struct super_block *s, void *data)
1585 {
1586 struct nfs_sb_mountdata *sb_mntdata = data;
1587 struct nfs_server *server = sb_mntdata->server;
1588 int ret;
1589
1590 s->s_flags = sb_mntdata->mntflags;
1591 s->s_fs_info = server;
1592 ret = set_anon_super(s, server);
1593 if (ret == 0)
1594 server->s_dev = s->s_dev;
1595 return ret;
1596 }
1597
1598 static int nfs_compare_super_address(struct nfs_server *server1,
1599 struct nfs_server *server2)
1600 {
1601 struct sockaddr *sap1, *sap2;
1602
1603 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1604 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1605
1606 if (sap1->sa_family != sap2->sa_family)
1607 return 0;
1608
1609 switch (sap1->sa_family) {
1610 case AF_INET: {
1611 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1612 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1613 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1614 return 0;
1615 if (sin1->sin_port != sin2->sin_port)
1616 return 0;
1617 break;
1618 }
1619 case AF_INET6: {
1620 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1621 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1622 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1623 return 0;
1624 if (sin1->sin6_port != sin2->sin6_port)
1625 return 0;
1626 break;
1627 }
1628 default:
1629 return 0;
1630 }
1631
1632 return 1;
1633 }
1634
1635 static int nfs_compare_super(struct super_block *sb, void *data)
1636 {
1637 struct nfs_sb_mountdata *sb_mntdata = data;
1638 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1639 int mntflags = sb_mntdata->mntflags;
1640
1641 if (!nfs_compare_super_address(old, server))
1642 return 0;
1643 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1644 if (old->flags & NFS_MOUNT_UNSHARED)
1645 return 0;
1646 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1647 return 0;
1648 return nfs_compare_mount_options(sb, server, mntflags);
1649 }
1650
1651 static int nfs_bdi_register(struct nfs_server *server)
1652 {
1653 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1654 }
1655
1656 static int nfs_get_sb(struct file_system_type *fs_type,
1657 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1658 {
1659 struct nfs_server *server = NULL;
1660 struct super_block *s;
1661 struct nfs_parsed_mount_data *data;
1662 struct nfs_fh *mntfh;
1663 struct dentry *mntroot;
1664 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1665 struct nfs_sb_mountdata sb_mntdata = {
1666 .mntflags = flags,
1667 };
1668 int error = -ENOMEM;
1669
1670 data = kzalloc(sizeof(*data), GFP_KERNEL);
1671 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1672 if (data == NULL || mntfh == NULL)
1673 goto out_free_fh;
1674
1675 security_init_mnt_opts(&data->lsm_opts);
1676
1677 /* Validate the mount data */
1678 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1679 if (error < 0)
1680 goto out;
1681
1682 /* Get a volume representation */
1683 server = nfs_create_server(data, mntfh);
1684 if (IS_ERR(server)) {
1685 error = PTR_ERR(server);
1686 goto out;
1687 }
1688 sb_mntdata.server = server;
1689
1690 if (server->flags & NFS_MOUNT_UNSHARED)
1691 compare_super = NULL;
1692
1693 /* Get a superblock - note that we may end up sharing one that already exists */
1694 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1695 if (IS_ERR(s)) {
1696 error = PTR_ERR(s);
1697 goto out_err_nosb;
1698 }
1699
1700 if (s->s_fs_info != server) {
1701 nfs_free_server(server);
1702 server = NULL;
1703 } else {
1704 error = nfs_bdi_register(server);
1705 if (error)
1706 goto error_splat_super;
1707 }
1708
1709 if (!s->s_root) {
1710 /* initial superblock/root creation */
1711 nfs_fill_super(s, data);
1712 }
1713
1714 mntroot = nfs_get_root(s, mntfh);
1715 if (IS_ERR(mntroot)) {
1716 error = PTR_ERR(mntroot);
1717 goto error_splat_super;
1718 }
1719
1720 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1721 if (error)
1722 goto error_splat_root;
1723
1724 s->s_flags |= MS_ACTIVE;
1725 mnt->mnt_sb = s;
1726 mnt->mnt_root = mntroot;
1727 error = 0;
1728
1729 out:
1730 kfree(data->nfs_server.hostname);
1731 kfree(data->mount_server.hostname);
1732 security_free_mnt_opts(&data->lsm_opts);
1733 out_free_fh:
1734 kfree(mntfh);
1735 kfree(data);
1736 return error;
1737
1738 out_err_nosb:
1739 nfs_free_server(server);
1740 goto out;
1741
1742 error_splat_root:
1743 dput(mntroot);
1744 error_splat_super:
1745 up_write(&s->s_umount);
1746 deactivate_super(s);
1747 goto out;
1748 }
1749
1750 /*
1751 * Destroy an NFS2/3 superblock
1752 */
1753 static void nfs_kill_super(struct super_block *s)
1754 {
1755 struct nfs_server *server = NFS_SB(s);
1756
1757 bdi_unregister(&server->backing_dev_info);
1758 kill_anon_super(s);
1759 nfs_free_server(server);
1760 }
1761
1762 /*
1763 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1764 */
1765 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1766 const char *dev_name, void *raw_data,
1767 struct vfsmount *mnt)
1768 {
1769 struct nfs_clone_mount *data = raw_data;
1770 struct super_block *s;
1771 struct nfs_server *server;
1772 struct dentry *mntroot;
1773 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1774 struct nfs_sb_mountdata sb_mntdata = {
1775 .mntflags = flags,
1776 };
1777 int error;
1778
1779 dprintk("--> nfs_xdev_get_sb()\n");
1780
1781 /* create a new volume representation */
1782 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1783 if (IS_ERR(server)) {
1784 error = PTR_ERR(server);
1785 goto out_err_noserver;
1786 }
1787 sb_mntdata.server = server;
1788
1789 if (server->flags & NFS_MOUNT_UNSHARED)
1790 compare_super = NULL;
1791
1792 /* Get a superblock - note that we may end up sharing one that already exists */
1793 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1794 if (IS_ERR(s)) {
1795 error = PTR_ERR(s);
1796 goto out_err_nosb;
1797 }
1798
1799 if (s->s_fs_info != server) {
1800 nfs_free_server(server);
1801 server = NULL;
1802 } else {
1803 error = nfs_bdi_register(server);
1804 if (error)
1805 goto error_splat_super;
1806 }
1807
1808 if (!s->s_root) {
1809 /* initial superblock/root creation */
1810 nfs_clone_super(s, data->sb);
1811 }
1812
1813 mntroot = nfs_get_root(s, data->fh);
1814 if (IS_ERR(mntroot)) {
1815 error = PTR_ERR(mntroot);
1816 goto error_splat_super;
1817 }
1818 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1819 dput(mntroot);
1820 error = -ESTALE;
1821 goto error_splat_super;
1822 }
1823
1824 s->s_flags |= MS_ACTIVE;
1825 mnt->mnt_sb = s;
1826 mnt->mnt_root = mntroot;
1827
1828 /* clone any lsm security options from the parent to the new sb */
1829 security_sb_clone_mnt_opts(data->sb, s);
1830
1831 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1832 return 0;
1833
1834 out_err_nosb:
1835 nfs_free_server(server);
1836 out_err_noserver:
1837 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1838 return error;
1839
1840 error_splat_super:
1841 up_write(&s->s_umount);
1842 deactivate_super(s);
1843 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1844 return error;
1845 }
1846
1847 #ifdef CONFIG_NFS_V4
1848
1849 /*
1850 * Finish setting up a cloned NFS4 superblock
1851 */
1852 static void nfs4_clone_super(struct super_block *sb,
1853 const struct super_block *old_sb)
1854 {
1855 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1856 sb->s_blocksize = old_sb->s_blocksize;
1857 sb->s_maxbytes = old_sb->s_maxbytes;
1858 sb->s_time_gran = 1;
1859 sb->s_op = old_sb->s_op;
1860 nfs_initialise_sb(sb);
1861 }
1862
1863 /*
1864 * Set up an NFS4 superblock
1865 */
1866 static void nfs4_fill_super(struct super_block *sb)
1867 {
1868 sb->s_time_gran = 1;
1869 sb->s_op = &nfs4_sops;
1870 nfs_initialise_sb(sb);
1871 }
1872
1873 /*
1874 * Validate NFSv4 mount options
1875 */
1876 static int nfs4_validate_mount_data(void *options,
1877 struct nfs_parsed_mount_data *args,
1878 const char *dev_name)
1879 {
1880 struct sockaddr_in *ap;
1881 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1882 char *c;
1883
1884 if (data == NULL)
1885 goto out_no_data;
1886
1887 args->rsize = NFS_MAX_FILE_IO_SIZE;
1888 args->wsize = NFS_MAX_FILE_IO_SIZE;
1889 args->timeo = 600;
1890 args->retrans = 2;
1891 args->acregmin = 3;
1892 args->acregmax = 60;
1893 args->acdirmin = 30;
1894 args->acdirmax = 60;
1895 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
1896 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1897
1898 switch (data->version) {
1899 case 1:
1900 ap = (struct sockaddr_in *)&args->nfs_server.address;
1901 if (data->host_addrlen > sizeof(args->nfs_server.address))
1902 goto out_no_address;
1903 if (data->host_addrlen == 0)
1904 goto out_no_address;
1905 args->nfs_server.addrlen = data->host_addrlen;
1906 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1907 return -EFAULT;
1908 if (!nfs_verify_server_address((struct sockaddr *)
1909 &args->nfs_server.address))
1910 goto out_no_address;
1911
1912 switch (data->auth_flavourlen) {
1913 case 0:
1914 args->auth_flavors[0] = RPC_AUTH_UNIX;
1915 break;
1916 case 1:
1917 if (copy_from_user(&args->auth_flavors[0],
1918 data->auth_flavours,
1919 sizeof(args->auth_flavors[0])))
1920 return -EFAULT;
1921 break;
1922 default:
1923 goto out_inval_auth;
1924 }
1925
1926 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1927 if (IS_ERR(c))
1928 return PTR_ERR(c);
1929 args->nfs_server.hostname = c;
1930
1931 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1932 if (IS_ERR(c))
1933 return PTR_ERR(c);
1934 args->nfs_server.export_path = c;
1935 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1936
1937 c = strndup_user(data->client_addr.data, 16);
1938 if (IS_ERR(c))
1939 return PTR_ERR(c);
1940 args->client_address = c;
1941
1942 /*
1943 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1944 * can deal with.
1945 */
1946
1947 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1948 args->rsize = data->rsize;
1949 args->wsize = data->wsize;
1950 args->timeo = data->timeo;
1951 args->retrans = data->retrans;
1952 args->acregmin = data->acregmin;
1953 args->acregmax = data->acregmax;
1954 args->acdirmin = data->acdirmin;
1955 args->acdirmax = data->acdirmax;
1956 args->nfs_server.protocol = data->proto;
1957
1958 break;
1959 default: {
1960 unsigned int len;
1961
1962 if (nfs_parse_mount_options((char *)options, args) == 0)
1963 return -EINVAL;
1964
1965 if (!nfs_verify_server_address((struct sockaddr *)
1966 &args->nfs_server.address))
1967 return -EINVAL;
1968
1969 switch (args->auth_flavor_len) {
1970 case 0:
1971 args->auth_flavors[0] = RPC_AUTH_UNIX;
1972 break;
1973 case 1:
1974 break;
1975 default:
1976 goto out_inval_auth;
1977 }
1978
1979 /*
1980 * Split "dev_name" into "hostname:mntpath".
1981 */
1982 c = strchr(dev_name, ':');
1983 if (c == NULL)
1984 return -EINVAL;
1985 /* while calculating len, pretend ':' is '\0' */
1986 len = c - dev_name;
1987 if (len > NFS4_MAXNAMLEN)
1988 return -ENAMETOOLONG;
1989 /* N.B. caller will free nfs_server.hostname in all cases */
1990 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1991 if (!args->nfs_server.hostname)
1992 goto out_nomem;
1993
1994 c++; /* step over the ':' */
1995 len = strlen(c);
1996 if (len > NFS4_MAXPATHLEN)
1997 return -ENAMETOOLONG;
1998 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1999 if (!args->nfs_server.export_path)
2000 goto out_nomem;
2001
2002 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
2003
2004 if (args->client_address == NULL)
2005 goto out_no_client_address;
2006
2007 break;
2008 }
2009 }
2010
2011 return 0;
2012
2013 out_no_data:
2014 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2015 return -EINVAL;
2016
2017 out_inval_auth:
2018 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2019 data->auth_flavourlen);
2020 return -EINVAL;
2021
2022 out_nomem:
2023 dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
2024 return -ENOMEM;
2025
2026 out_no_address:
2027 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2028 return -EINVAL;
2029
2030 out_no_client_address:
2031 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2032 return -EINVAL;
2033 }
2034
2035 /*
2036 * Get the superblock for an NFS4 mountpoint
2037 */
2038 static int nfs4_get_sb(struct file_system_type *fs_type,
2039 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2040 {
2041 struct nfs_parsed_mount_data *data;
2042 struct super_block *s;
2043 struct nfs_server *server;
2044 struct nfs_fh *mntfh;
2045 struct dentry *mntroot;
2046 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2047 struct nfs_sb_mountdata sb_mntdata = {
2048 .mntflags = flags,
2049 };
2050 int error = -ENOMEM;
2051
2052 data = kzalloc(sizeof(*data), GFP_KERNEL);
2053 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2054 if (data == NULL || mntfh == NULL)
2055 goto out_free_fh;
2056
2057 security_init_mnt_opts(&data->lsm_opts);
2058
2059 /* Validate the mount data */
2060 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2061 if (error < 0)
2062 goto out;
2063
2064 /* Get a volume representation */
2065 server = nfs4_create_server(data, mntfh);
2066 if (IS_ERR(server)) {
2067 error = PTR_ERR(server);
2068 goto out;
2069 }
2070 sb_mntdata.server = server;
2071
2072 if (server->flags & NFS4_MOUNT_UNSHARED)
2073 compare_super = NULL;
2074
2075 /* Get a superblock - note that we may end up sharing one that already exists */
2076 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2077 if (IS_ERR(s)) {
2078 error = PTR_ERR(s);
2079 goto out_free;
2080 }
2081
2082 if (s->s_fs_info != server) {
2083 nfs_free_server(server);
2084 server = NULL;
2085 } else {
2086 error = nfs_bdi_register(server);
2087 if (error)
2088 goto error_splat_super;
2089 }
2090
2091 if (!s->s_root) {
2092 /* initial superblock/root creation */
2093 nfs4_fill_super(s);
2094 }
2095
2096 mntroot = nfs4_get_root(s, mntfh);
2097 if (IS_ERR(mntroot)) {
2098 error = PTR_ERR(mntroot);
2099 goto error_splat_super;
2100 }
2101
2102 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2103 if (error)
2104 goto error_splat_root;
2105
2106 s->s_flags |= MS_ACTIVE;
2107 mnt->mnt_sb = s;
2108 mnt->mnt_root = mntroot;
2109 error = 0;
2110
2111 out:
2112 kfree(data->client_address);
2113 kfree(data->nfs_server.export_path);
2114 kfree(data->nfs_server.hostname);
2115 security_free_mnt_opts(&data->lsm_opts);
2116 out_free_fh:
2117 kfree(mntfh);
2118 kfree(data);
2119 return error;
2120
2121 out_free:
2122 nfs_free_server(server);
2123 goto out;
2124
2125 error_splat_root:
2126 dput(mntroot);
2127 error_splat_super:
2128 up_write(&s->s_umount);
2129 deactivate_super(s);
2130 goto out;
2131 }
2132
2133 static void nfs4_kill_super(struct super_block *sb)
2134 {
2135 struct nfs_server *server = NFS_SB(sb);
2136
2137 nfs_return_all_delegations(sb);
2138 kill_anon_super(sb);
2139
2140 nfs4_renewd_prepare_shutdown(server);
2141 nfs_free_server(server);
2142 }
2143
2144 /*
2145 * Clone an NFS4 server record on xdev traversal (FSID-change)
2146 */
2147 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2148 const char *dev_name, void *raw_data,
2149 struct vfsmount *mnt)
2150 {
2151 struct nfs_clone_mount *data = raw_data;
2152 struct super_block *s;
2153 struct nfs_server *server;
2154 struct dentry *mntroot;
2155 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2156 struct nfs_sb_mountdata sb_mntdata = {
2157 .mntflags = flags,
2158 };
2159 int error;
2160
2161 dprintk("--> nfs4_xdev_get_sb()\n");
2162
2163 /* create a new volume representation */
2164 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2165 if (IS_ERR(server)) {
2166 error = PTR_ERR(server);
2167 goto out_err_noserver;
2168 }
2169 sb_mntdata.server = server;
2170
2171 if (server->flags & NFS4_MOUNT_UNSHARED)
2172 compare_super = NULL;
2173
2174 /* Get a superblock - note that we may end up sharing one that already exists */
2175 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2176 if (IS_ERR(s)) {
2177 error = PTR_ERR(s);
2178 goto out_err_nosb;
2179 }
2180
2181 if (s->s_fs_info != server) {
2182 nfs_free_server(server);
2183 server = NULL;
2184 } else {
2185 error = nfs_bdi_register(server);
2186 if (error)
2187 goto error_splat_super;
2188 }
2189
2190 if (!s->s_root) {
2191 /* initial superblock/root creation */
2192 nfs4_clone_super(s, data->sb);
2193 }
2194
2195 mntroot = nfs4_get_root(s, data->fh);
2196 if (IS_ERR(mntroot)) {
2197 error = PTR_ERR(mntroot);
2198 goto error_splat_super;
2199 }
2200 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2201 dput(mntroot);
2202 error = -ESTALE;
2203 goto error_splat_super;
2204 }
2205
2206 s->s_flags |= MS_ACTIVE;
2207 mnt->mnt_sb = s;
2208 mnt->mnt_root = mntroot;
2209
2210 security_sb_clone_mnt_opts(data->sb, s);
2211
2212 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2213 return 0;
2214
2215 out_err_nosb:
2216 nfs_free_server(server);
2217 out_err_noserver:
2218 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2219 return error;
2220
2221 error_splat_super:
2222 up_write(&s->s_umount);
2223 deactivate_super(s);
2224 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2225 return error;
2226 }
2227
2228 /*
2229 * Create an NFS4 server record on referral traversal
2230 */
2231 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2232 const char *dev_name, void *raw_data,
2233 struct vfsmount *mnt)
2234 {
2235 struct nfs_clone_mount *data = raw_data;
2236 struct super_block *s;
2237 struct nfs_server *server;
2238 struct dentry *mntroot;
2239 struct nfs_fh mntfh;
2240 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2241 struct nfs_sb_mountdata sb_mntdata = {
2242 .mntflags = flags,
2243 };
2244 int error;
2245
2246 dprintk("--> nfs4_referral_get_sb()\n");
2247
2248 /* create a new volume representation */
2249 server = nfs4_create_referral_server(data, &mntfh);
2250 if (IS_ERR(server)) {
2251 error = PTR_ERR(server);
2252 goto out_err_noserver;
2253 }
2254 sb_mntdata.server = server;
2255
2256 if (server->flags & NFS4_MOUNT_UNSHARED)
2257 compare_super = NULL;
2258
2259 /* Get a superblock - note that we may end up sharing one that already exists */
2260 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2261 if (IS_ERR(s)) {
2262 error = PTR_ERR(s);
2263 goto out_err_nosb;
2264 }
2265
2266 if (s->s_fs_info != server) {
2267 nfs_free_server(server);
2268 server = NULL;
2269 } else {
2270 error = nfs_bdi_register(server);
2271 if (error)
2272 goto error_splat_super;
2273 }
2274
2275 if (!s->s_root) {
2276 /* initial superblock/root creation */
2277 nfs4_fill_super(s);
2278 }
2279
2280 mntroot = nfs4_get_root(s, &mntfh);
2281 if (IS_ERR(mntroot)) {
2282 error = PTR_ERR(mntroot);
2283 goto error_splat_super;
2284 }
2285 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2286 dput(mntroot);
2287 error = -ESTALE;
2288 goto error_splat_super;
2289 }
2290
2291 s->s_flags |= MS_ACTIVE;
2292 mnt->mnt_sb = s;
2293 mnt->mnt_root = mntroot;
2294
2295 security_sb_clone_mnt_opts(data->sb, s);
2296
2297 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2298 return 0;
2299
2300 out_err_nosb:
2301 nfs_free_server(server);
2302 out_err_noserver:
2303 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2304 return error;
2305
2306 error_splat_super:
2307 up_write(&s->s_umount);
2308 deactivate_super(s);
2309 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2310 return error;
2311 }
2312
2313 #endif /* CONFIG_NFS_V4 */
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