?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'sched-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6/sactl.git] / fs / nfs / super.c
blobe9b20173fef33835e9d87be1a9b67e718b8dfe0a
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 /* Special mount options */
96 Opt_userspace, Opt_deprecated, Opt_sloppy,
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_sloppy, "sloppy" },
107
108 { Opt_soft, "soft" },
109 { Opt_hard, "hard" },
110 { Opt_deprecated, "intr" },
111 { Opt_deprecated, "nointr" },
112 { Opt_posix, "posix" },
113 { Opt_noposix, "noposix" },
114 { Opt_cto, "cto" },
115 { Opt_nocto, "nocto" },
116 { Opt_ac, "ac" },
117 { Opt_noac, "noac" },
118 { Opt_lock, "lock" },
119 { Opt_nolock, "nolock" },
120 { Opt_v2, "v2" },
121 { Opt_v3, "v3" },
122 { Opt_udp, "udp" },
123 { Opt_tcp, "tcp" },
124 { Opt_rdma, "rdma" },
125 { Opt_acl, "acl" },
126 { Opt_noacl, "noacl" },
127 { Opt_rdirplus, "rdirplus" },
128 { Opt_nordirplus, "nordirplus" },
129 { Opt_sharecache, "sharecache" },
130 { Opt_nosharecache, "nosharecache" },
131
132 { Opt_port, "port=%u" },
133 { Opt_rsize, "rsize=%u" },
134 { Opt_wsize, "wsize=%u" },
135 { Opt_bsize, "bsize=%u" },
136 { Opt_timeo, "timeo=%u" },
137 { Opt_retrans, "retrans=%u" },
138 { Opt_acregmin, "acregmin=%u" },
139 { Opt_acregmax, "acregmax=%u" },
140 { Opt_acdirmin, "acdirmin=%u" },
141 { Opt_acdirmax, "acdirmax=%u" },
142 { Opt_actimeo, "actimeo=%u" },
143 { Opt_namelen, "namlen=%u" },
144 { Opt_mountport, "mountport=%u" },
145 { Opt_mountvers, "mountvers=%u" },
146 { Opt_nfsvers, "nfsvers=%u" },
147 { Opt_nfsvers, "vers=%u" },
148
149 { Opt_sec, "sec=%s" },
150 { Opt_proto, "proto=%s" },
151 { Opt_mountproto, "mountproto=%s" },
152 { Opt_addr, "addr=%s" },
153 { Opt_clientaddr, "clientaddr=%s" },
154 { Opt_mounthost, "mounthost=%s" },
155 { Opt_mountaddr, "mountaddr=%s" },
156
157 { Opt_err, NULL }
158 };
159
160 enum {
161 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
162
163 Opt_xprt_err
164 };
165
166 static match_table_t nfs_xprt_protocol_tokens = {
167 { Opt_xprt_udp, "udp" },
168 { Opt_xprt_tcp, "tcp" },
169 { Opt_xprt_rdma, "rdma" },
170
171 { Opt_xprt_err, NULL }
172 };
173
174 enum {
175 Opt_sec_none, Opt_sec_sys,
176 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
177 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
178 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
179
180 Opt_sec_err
181 };
182
183 static match_table_t nfs_secflavor_tokens = {
184 { Opt_sec_none, "none" },
185 { Opt_sec_none, "null" },
186 { Opt_sec_sys, "sys" },
187
188 { Opt_sec_krb5, "krb5" },
189 { Opt_sec_krb5i, "krb5i" },
190 { Opt_sec_krb5p, "krb5p" },
191
192 { Opt_sec_lkey, "lkey" },
193 { Opt_sec_lkeyi, "lkeyi" },
194 { Opt_sec_lkeyp, "lkeyp" },
195
196 { Opt_sec_spkm, "spkm3" },
197 { Opt_sec_spkmi, "spkm3i" },
198 { Opt_sec_spkmp, "spkm3p" },
199
200 { Opt_sec_err, NULL }
201 };
202
203
204 static void nfs_umount_begin(struct super_block *);
205 static int nfs_statfs(struct dentry *, struct kstatfs *);
206 static int nfs_show_options(struct seq_file *, struct vfsmount *);
207 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
208 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
209 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
210 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
211 static void nfs_kill_super(struct super_block *);
212 static void nfs_put_super(struct super_block *);
213 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
214
215 static struct file_system_type nfs_fs_type = {
216 .owner = THIS_MODULE,
217 .name = "nfs",
218 .get_sb = nfs_get_sb,
219 .kill_sb = nfs_kill_super,
220 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
221 };
222
223 struct file_system_type nfs_xdev_fs_type = {
224 .owner = THIS_MODULE,
225 .name = "nfs",
226 .get_sb = nfs_xdev_get_sb,
227 .kill_sb = nfs_kill_super,
228 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
229 };
230
231 static const struct super_operations nfs_sops = {
232 .alloc_inode = nfs_alloc_inode,
233 .destroy_inode = nfs_destroy_inode,
234 .write_inode = nfs_write_inode,
235 .put_super = nfs_put_super,
236 .statfs = nfs_statfs,
237 .clear_inode = nfs_clear_inode,
238 .umount_begin = nfs_umount_begin,
239 .show_options = nfs_show_options,
240 .show_stats = nfs_show_stats,
241 .remount_fs = nfs_remount,
242 };
243
244 #ifdef CONFIG_NFS_V4
245 static int nfs4_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_xdev_get_sb(struct file_system_type *fs_type,
248 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
249 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
250 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
251 static void nfs4_kill_super(struct super_block *sb);
252
253 static struct file_system_type nfs4_fs_type = {
254 .owner = THIS_MODULE,
255 .name = "nfs4",
256 .get_sb = nfs4_get_sb,
257 .kill_sb = nfs4_kill_super,
258 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
259 };
260
261 struct file_system_type nfs4_xdev_fs_type = {
262 .owner = THIS_MODULE,
263 .name = "nfs4",
264 .get_sb = nfs4_xdev_get_sb,
265 .kill_sb = nfs4_kill_super,
266 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
267 };
268
269 struct file_system_type nfs4_referral_fs_type = {
270 .owner = THIS_MODULE,
271 .name = "nfs4",
272 .get_sb = nfs4_referral_get_sb,
273 .kill_sb = nfs4_kill_super,
274 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
275 };
276
277 static const struct super_operations nfs4_sops = {
278 .alloc_inode = nfs_alloc_inode,
279 .destroy_inode = nfs_destroy_inode,
280 .write_inode = nfs_write_inode,
281 .statfs = nfs_statfs,
282 .clear_inode = nfs4_clear_inode,
283 .umount_begin = nfs_umount_begin,
284 .show_options = nfs_show_options,
285 .show_stats = nfs_show_stats,
286 .remount_fs = nfs_remount,
287 };
288 #endif
289
290 static struct shrinker acl_shrinker = {
291 .shrink = nfs_access_cache_shrinker,
292 .seeks = DEFAULT_SEEKS,
293 };
294
295 /*
296 * Register the NFS filesystems
297 */
298 int __init register_nfs_fs(void)
299 {
300 int ret;
301
302 ret = register_filesystem(&nfs_fs_type);
303 if (ret < 0)
304 goto error_0;
305
306 ret = nfs_register_sysctl();
307 if (ret < 0)
308 goto error_1;
309 #ifdef CONFIG_NFS_V4
310 ret = register_filesystem(&nfs4_fs_type);
311 if (ret < 0)
312 goto error_2;
313 #endif
314 register_shrinker(&acl_shrinker);
315 return 0;
316
317 #ifdef CONFIG_NFS_V4
318 error_2:
319 nfs_unregister_sysctl();
320 #endif
321 error_1:
322 unregister_filesystem(&nfs_fs_type);
323 error_0:
324 return ret;
325 }
326
327 /*
328 * Unregister the NFS filesystems
329 */
330 void __exit unregister_nfs_fs(void)
331 {
332 unregister_shrinker(&acl_shrinker);
333 #ifdef CONFIG_NFS_V4
334 unregister_filesystem(&nfs4_fs_type);
335 #endif
336 nfs_unregister_sysctl();
337 unregister_filesystem(&nfs_fs_type);
338 }
339
340 void nfs_sb_active(struct nfs_server *server)
341 {
342 atomic_inc(&server->active);
343 }
344
345 void nfs_sb_deactive(struct nfs_server *server)
346 {
347 if (atomic_dec_and_test(&server->active))
348 wake_up(&server->active_wq);
349 }
350
351 static void nfs_put_super(struct super_block *sb)
352 {
353 struct nfs_server *server = NFS_SB(sb);
354 /*
355 * Make sure there are no outstanding ops to this server.
356 * If so, wait for them to finish before allowing the
357 * unmount to continue.
358 */
359 wait_event(server->active_wq, atomic_read(&server->active) == 0);
360 }
361
362 /*
363 * Deliver file system statistics to userspace
364 */
365 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
366 {
367 struct nfs_server *server = NFS_SB(dentry->d_sb);
368 unsigned char blockbits;
369 unsigned long blockres;
370 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
371 struct nfs_fattr fattr;
372 struct nfs_fsstat res = {
373 .fattr = &fattr,
374 };
375 int error;
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 return 0;
409
410 out_err:
411 dprintk("%s: statfs error = %d\n", __func__, -error);
412 return error;
413 }
414
415 /*
416 * Map the security flavour number to a name
417 */
418 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
419 {
420 static const struct {
421 rpc_authflavor_t flavour;
422 const char *str;
423 } sec_flavours[] = {
424 { RPC_AUTH_NULL, "null" },
425 { RPC_AUTH_UNIX, "sys" },
426 { RPC_AUTH_GSS_KRB5, "krb5" },
427 { RPC_AUTH_GSS_KRB5I, "krb5i" },
428 { RPC_AUTH_GSS_KRB5P, "krb5p" },
429 { RPC_AUTH_GSS_LKEY, "lkey" },
430 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
431 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
432 { RPC_AUTH_GSS_SPKM, "spkm" },
433 { RPC_AUTH_GSS_SPKMI, "spkmi" },
434 { RPC_AUTH_GSS_SPKMP, "spkmp" },
435 { UINT_MAX, "unknown" }
436 };
437 int i;
438
439 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
440 if (sec_flavours[i].flavour == flavour)
441 break;
442 }
443 return sec_flavours[i].str;
444 }
445
446 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
447 int showdefaults)
448 {
449 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
450
451 switch (sap->sa_family) {
452 case AF_INET: {
453 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
454 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
455 NIPQUAD(sin->sin_addr.s_addr));
456 break;
457 }
458 case AF_INET6: {
459 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
460 seq_printf(m, ",mountaddr=" NIP6_FMT,
461 NIP6(sin6->sin6_addr));
462 break;
463 }
464 default:
465 if (showdefaults)
466 seq_printf(m, ",mountaddr=unspecified");
467 }
468
469 if (nfss->mountd_version || showdefaults)
470 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
471 if (nfss->mountd_port || showdefaults)
472 seq_printf(m, ",mountport=%u", nfss->mountd_port);
473
474 switch (nfss->mountd_protocol) {
475 case IPPROTO_UDP:
476 seq_printf(m, ",mountproto=udp");
477 break;
478 case IPPROTO_TCP:
479 seq_printf(m, ",mountproto=tcp");
480 break;
481 default:
482 if (showdefaults)
483 seq_printf(m, ",mountproto=auto");
484 }
485 }
486
487 /*
488 * Describe the mount options in force on this server representation
489 */
490 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
491 int showdefaults)
492 {
493 static const struct proc_nfs_info {
494 int flag;
495 const char *str;
496 const char *nostr;
497 } nfs_info[] = {
498 { NFS_MOUNT_SOFT, ",soft", ",hard" },
499 { NFS_MOUNT_INTR, ",intr", ",nointr" },
500 { NFS_MOUNT_POSIX, ",posix", "" },
501 { NFS_MOUNT_NOCTO, ",nocto", "" },
502 { NFS_MOUNT_NOAC, ",noac", "" },
503 { NFS_MOUNT_NONLM, ",nolock", "" },
504 { NFS_MOUNT_NOACL, ",noacl", "" },
505 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
506 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
507 { 0, NULL, NULL }
508 };
509 const struct proc_nfs_info *nfs_infop;
510 struct nfs_client *clp = nfss->nfs_client;
511 u32 version = clp->rpc_ops->version;
512
513 seq_printf(m, ",vers=%u", version);
514 seq_printf(m, ",rsize=%u", nfss->rsize);
515 seq_printf(m, ",wsize=%u", nfss->wsize);
516 if (nfss->bsize != 0)
517 seq_printf(m, ",bsize=%u", nfss->bsize);
518 seq_printf(m, ",namlen=%u", nfss->namelen);
519 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
520 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
521 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
522 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
523 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
524 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
525 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
526 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
527 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
528 if (nfss->flags & nfs_infop->flag)
529 seq_puts(m, nfs_infop->str);
530 else
531 seq_puts(m, nfs_infop->nostr);
532 }
533 seq_printf(m, ",proto=%s",
534 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
535 if (version == 4) {
536 if (nfss->port != NFS_PORT)
537 seq_printf(m, ",port=%u", nfss->port);
538 } else
539 if (nfss->port)
540 seq_printf(m, ",port=%u", nfss->port);
541
542 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
543 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
544 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
545
546 if (version != 4)
547 nfs_show_mountd_options(m, nfss, showdefaults);
548
549 #ifdef CONFIG_NFS_V4
550 if (clp->rpc_ops->version == 4)
551 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
552 #endif
553 }
554
555 /*
556 * Describe the mount options on this VFS mountpoint
557 */
558 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
559 {
560 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
561
562 nfs_show_mount_options(m, nfss, 0);
563
564 seq_printf(m, ",addr=%s",
565 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
566 RPC_DISPLAY_ADDR));
567
568 return 0;
569 }
570
571 /*
572 * Present statistical information for this VFS mountpoint
573 */
574 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
575 {
576 int i, cpu;
577 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
578 struct rpc_auth *auth = nfss->client->cl_auth;
579 struct nfs_iostats totals = { };
580
581 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
582
583 /*
584 * Display all mount option settings
585 */
586 seq_printf(m, "\n\topts:\t");
587 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
588 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
591 nfs_show_mount_options(m, nfss, 1);
592
593 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
594
595 seq_printf(m, "\n\tcaps:\t");
596 seq_printf(m, "caps=0x%x", nfss->caps);
597 seq_printf(m, ",wtmult=%u", nfss->wtmult);
598 seq_printf(m, ",dtsize=%u", nfss->dtsize);
599 seq_printf(m, ",bsize=%u", nfss->bsize);
600 seq_printf(m, ",namlen=%u", nfss->namelen);
601
602 #ifdef CONFIG_NFS_V4
603 if (nfss->nfs_client->rpc_ops->version == 4) {
604 seq_printf(m, "\n\tnfsv4:\t");
605 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
606 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
607 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
608 }
609 #endif
610
611 /*
612 * Display security flavor in effect for this mount
613 */
614 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
615 if (auth->au_flavor)
616 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
617
618 /*
619 * Display superblock I/O counters
620 */
621 for_each_possible_cpu(cpu) {
622 struct nfs_iostats *stats;
623
624 preempt_disable();
625 stats = per_cpu_ptr(nfss->io_stats, cpu);
626
627 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
628 totals.events[i] += stats->events[i];
629 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
630 totals.bytes[i] += stats->bytes[i];
631
632 preempt_enable();
633 }
634
635 seq_printf(m, "\n\tevents:\t");
636 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
637 seq_printf(m, "%lu ", totals.events[i]);
638 seq_printf(m, "\n\tbytes:\t");
639 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
640 seq_printf(m, "%Lu ", totals.bytes[i]);
641 seq_printf(m, "\n");
642
643 rpc_print_iostats(m, nfss->client);
644
645 return 0;
646 }
647
648 /*
649 * Begin unmount by attempting to remove all automounted mountpoints we added
650 * in response to xdev traversals and referrals
651 */
652 static void nfs_umount_begin(struct super_block *sb)
653 {
654 struct nfs_server *server = NFS_SB(sb);
655 struct rpc_clnt *rpc;
656
657 /* -EIO all pending I/O */
658 rpc = server->client_acl;
659 if (!IS_ERR(rpc))
660 rpc_killall_tasks(rpc);
661 rpc = server->client;
662 if (!IS_ERR(rpc))
663 rpc_killall_tasks(rpc);
664 }
665
666 /*
667 * Set the port number in an address. Be agnostic about the address family.
668 */
669 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
670 {
671 switch (sap->sa_family) {
672 case AF_INET: {
673 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
674 ap->sin_port = htons(port);
675 break;
676 }
677 case AF_INET6: {
678 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
679 ap->sin6_port = htons(port);
680 break;
681 }
682 }
683 }
684
685 /*
686 * Sanity-check a server address provided by the mount command.
687 *
688 * Address family must be initialized, and address must not be
689 * the ANY address for that family.
690 */
691 static int nfs_verify_server_address(struct sockaddr *addr)
692 {
693 switch (addr->sa_family) {
694 case AF_INET: {
695 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
696 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
697 }
698 case AF_INET6: {
699 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
700 return !ipv6_addr_any(sa);
701 }
702 }
703
704 return 0;
705 }
706
707 static void nfs_parse_ipv4_address(char *string, size_t str_len,
708 struct sockaddr *sap, size_t *addr_len)
709 {
710 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
711 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
712
713 if (str_len <= INET_ADDRSTRLEN) {
714 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
715 (int)str_len, string);
716
717 sin->sin_family = AF_INET;
718 *addr_len = sizeof(*sin);
719 if (in4_pton(string, str_len, addr, '\0', NULL))
720 return;
721 }
722
723 sap->sa_family = AF_UNSPEC;
724 *addr_len = 0;
725 }
726
727 #define IPV6_SCOPE_DELIMITER '%'
728
729 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
730 static void nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
731 const char *delim,
732 struct sockaddr_in6 *sin6)
733 {
734 char *p;
735 size_t len;
736
737 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
738 return ;
739 if (*delim != IPV6_SCOPE_DELIMITER)
740 return;
741
742 len = (string + str_len) - delim - 1;
743 p = kstrndup(delim + 1, len, GFP_KERNEL);
744 if (p) {
745 unsigned long scope_id = 0;
746 struct net_device *dev;
747
748 dev = dev_get_by_name(&init_net, p);
749 if (dev != NULL) {
750 scope_id = dev->ifindex;
751 dev_put(dev);
752 } else {
753 /* scope_id is set to zero on error */
754 strict_strtoul(p, 10, &scope_id);
755 }
756
757 kfree(p);
758 sin6->sin6_scope_id = scope_id;
759 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
760 }
761 }
762
763 static void nfs_parse_ipv6_address(char *string, size_t str_len,
764 struct sockaddr *sap, size_t *addr_len)
765 {
766 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
767 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
768 const char *delim;
769
770 if (str_len <= INET6_ADDRSTRLEN) {
771 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
772 (int)str_len, string);
773
774 sin6->sin6_family = AF_INET6;
775 *addr_len = sizeof(*sin6);
776 if (in6_pton(string, str_len, addr, IPV6_SCOPE_DELIMITER, &delim)) {
777 nfs_parse_ipv6_scope_id(string, str_len, delim, sin6);
778 return;
779 }
780 }
781
782 sap->sa_family = AF_UNSPEC;
783 *addr_len = 0;
784 }
785 #else
786 static void nfs_parse_ipv6_address(char *string, size_t str_len,
787 struct sockaddr *sap, size_t *addr_len)
788 {
789 sap->sa_family = AF_UNSPEC;
790 *addr_len = 0;
791 }
792 #endif
793
794 /*
795 * Construct a sockaddr based on the contents of a string that contains
796 * an IP address in presentation format.
797 *
798 * If there is a problem constructing the new sockaddr, set the address
799 * family to AF_UNSPEC.
800 */
801 static void nfs_parse_ip_address(char *string, size_t str_len,
802 struct sockaddr *sap, size_t *addr_len)
803 {
804 unsigned int i, colons;
805
806 colons = 0;
807 for (i = 0; i < str_len; i++)
808 if (string[i] == ':')
809 colons++;
810
811 if (colons >= 2)
812 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
813 else
814 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
815 }
816
817 /*
818 * Sanity check the NFS transport protocol.
819 *
820 */
821 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
822 {
823 switch (mnt->nfs_server.protocol) {
824 case XPRT_TRANSPORT_UDP:
825 case XPRT_TRANSPORT_TCP:
826 case XPRT_TRANSPORT_RDMA:
827 break;
828 default:
829 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
830 }
831 }
832
833 /*
834 * For text based NFSv2/v3 mounts, the mount protocol transport default
835 * settings should depend upon the specified NFS transport.
836 */
837 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
838 {
839 nfs_validate_transport_protocol(mnt);
840
841 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
842 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
843 return;
844 switch (mnt->nfs_server.protocol) {
845 case XPRT_TRANSPORT_UDP:
846 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
847 break;
848 case XPRT_TRANSPORT_TCP:
849 case XPRT_TRANSPORT_RDMA:
850 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
851 }
852 }
853
854 /*
855 * Parse the value of the 'sec=' option.
856 *
857 * The flavor_len setting is for v4 mounts.
858 */
859 static int nfs_parse_security_flavors(char *value,
860 struct nfs_parsed_mount_data *mnt)
861 {
862 substring_t args[MAX_OPT_ARGS];
863
864 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
865
866 switch (match_token(value, nfs_secflavor_tokens, args)) {
867 case Opt_sec_none:
868 mnt->auth_flavor_len = 0;
869 mnt->auth_flavors[0] = RPC_AUTH_NULL;
870 break;
871 case Opt_sec_sys:
872 mnt->auth_flavor_len = 0;
873 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
874 break;
875 case Opt_sec_krb5:
876 mnt->auth_flavor_len = 1;
877 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
878 break;
879 case Opt_sec_krb5i:
880 mnt->auth_flavor_len = 1;
881 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
882 break;
883 case Opt_sec_krb5p:
884 mnt->auth_flavor_len = 1;
885 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
886 break;
887 case Opt_sec_lkey:
888 mnt->auth_flavor_len = 1;
889 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
890 break;
891 case Opt_sec_lkeyi:
892 mnt->auth_flavor_len = 1;
893 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
894 break;
895 case Opt_sec_lkeyp:
896 mnt->auth_flavor_len = 1;
897 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
898 break;
899 case Opt_sec_spkm:
900 mnt->auth_flavor_len = 1;
901 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
902 break;
903 case Opt_sec_spkmi:
904 mnt->auth_flavor_len = 1;
905 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
906 break;
907 case Opt_sec_spkmp:
908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
910 break;
911 default:
912 return 0;
913 }
914
915 return 1;
916 }
917
918 static void nfs_parse_invalid_value(const char *option)
919 {
920 dfprintk(MOUNT, "NFS: bad value specified for %s option\n", option);
921 }
922
923 /*
924 * Error-check and convert a string of mount options from user space into
925 * a data structure. The whole mount string is processed; bad options are
926 * skipped as they are encountered. If there were no errors, return 1;
927 * otherwise return 0 (zero).
928 */
929 static int nfs_parse_mount_options(char *raw,
930 struct nfs_parsed_mount_data *mnt)
931 {
932 char *p, *string, *secdata;
933 int rc, sloppy = 0, errors = 0;
934
935 if (!raw) {
936 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
937 return 1;
938 }
939 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
940
941 secdata = alloc_secdata();
942 if (!secdata)
943 goto out_nomem;
944
945 rc = security_sb_copy_data(raw, secdata);
946 if (rc)
947 goto out_security_failure;
948
949 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
950 if (rc)
951 goto out_security_failure;
952
953 free_secdata(secdata);
954
955 while ((p = strsep(&raw, ",")) != NULL) {
956 substring_t args[MAX_OPT_ARGS];
957 int option, token;
958
959 if (!*p)
960 continue;
961
962 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
963
964 token = match_token(p, nfs_mount_option_tokens, args);
965 switch (token) {
966
967 /*
968 * boolean options: foo/nofoo
969 */
970 case Opt_soft:
971 mnt->flags |= NFS_MOUNT_SOFT;
972 break;
973 case Opt_hard:
974 mnt->flags &= ~NFS_MOUNT_SOFT;
975 break;
976 case Opt_posix:
977 mnt->flags |= NFS_MOUNT_POSIX;
978 break;
979 case Opt_noposix:
980 mnt->flags &= ~NFS_MOUNT_POSIX;
981 break;
982 case Opt_cto:
983 mnt->flags &= ~NFS_MOUNT_NOCTO;
984 break;
985 case Opt_nocto:
986 mnt->flags |= NFS_MOUNT_NOCTO;
987 break;
988 case Opt_ac:
989 mnt->flags &= ~NFS_MOUNT_NOAC;
990 break;
991 case Opt_noac:
992 mnt->flags |= NFS_MOUNT_NOAC;
993 break;
994 case Opt_lock:
995 mnt->flags &= ~NFS_MOUNT_NONLM;
996 break;
997 case Opt_nolock:
998 mnt->flags |= NFS_MOUNT_NONLM;
999 break;
1000 case Opt_v2:
1001 mnt->flags &= ~NFS_MOUNT_VER3;
1002 break;
1003 case Opt_v3:
1004 mnt->flags |= NFS_MOUNT_VER3;
1005 break;
1006 case Opt_udp:
1007 mnt->flags &= ~NFS_MOUNT_TCP;
1008 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1009 break;
1010 case Opt_tcp:
1011 mnt->flags |= NFS_MOUNT_TCP;
1012 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1013 break;
1014 case Opt_rdma:
1015 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1016 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1017 break;
1018 case Opt_acl:
1019 mnt->flags &= ~NFS_MOUNT_NOACL;
1020 break;
1021 case Opt_noacl:
1022 mnt->flags |= NFS_MOUNT_NOACL;
1023 break;
1024 case Opt_rdirplus:
1025 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1026 break;
1027 case Opt_nordirplus:
1028 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1029 break;
1030 case Opt_sharecache:
1031 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1032 break;
1033 case Opt_nosharecache:
1034 mnt->flags |= NFS_MOUNT_UNSHARED;
1035 break;
1036
1037 /*
1038 * options that take numeric values
1039 */
1040 case Opt_port:
1041 if (match_int(args, &option) ||
1042 option < 0 || option > USHORT_MAX) {
1043 errors++;
1044 nfs_parse_invalid_value("port");
1045 } else
1046 mnt->nfs_server.port = option;
1047 break;
1048 case Opt_rsize:
1049 if (match_int(args, &option) || option < 0) {
1050 errors++;
1051 nfs_parse_invalid_value("rsize");
1052 } else
1053 mnt->rsize = option;
1054 break;
1055 case Opt_wsize:
1056 if (match_int(args, &option) || option < 0) {
1057 errors++;
1058 nfs_parse_invalid_value("wsize");
1059 } else
1060 mnt->wsize = option;
1061 break;
1062 case Opt_bsize:
1063 if (match_int(args, &option) || option < 0) {
1064 errors++;
1065 nfs_parse_invalid_value("bsize");
1066 } else
1067 mnt->bsize = option;
1068 break;
1069 case Opt_timeo:
1070 if (match_int(args, &option) || option <= 0) {
1071 errors++;
1072 nfs_parse_invalid_value("timeo");
1073 } else
1074 mnt->timeo = option;
1075 break;
1076 case Opt_retrans:
1077 if (match_int(args, &option) || option <= 0) {
1078 errors++;
1079 nfs_parse_invalid_value("retrans");
1080 } else
1081 mnt->retrans = option;
1082 break;
1083 case Opt_acregmin:
1084 if (match_int(args, &option) || option < 0) {
1085 errors++;
1086 nfs_parse_invalid_value("acregmin");
1087 } else
1088 mnt->acregmin = option;
1089 break;
1090 case Opt_acregmax:
1091 if (match_int(args, &option) || option < 0) {
1092 errors++;
1093 nfs_parse_invalid_value("acregmax");
1094 } else
1095 mnt->acregmax = option;
1096 break;
1097 case Opt_acdirmin:
1098 if (match_int(args, &option) || option < 0) {
1099 errors++;
1100 nfs_parse_invalid_value("acdirmin");
1101 } else
1102 mnt->acdirmin = option;
1103 break;
1104 case Opt_acdirmax:
1105 if (match_int(args, &option) || option < 0) {
1106 errors++;
1107 nfs_parse_invalid_value("acdirmax");
1108 } else
1109 mnt->acdirmax = option;
1110 break;
1111 case Opt_actimeo:
1112 if (match_int(args, &option) || option < 0) {
1113 errors++;
1114 nfs_parse_invalid_value("actimeo");
1115 } else
1116 mnt->acregmin = mnt->acregmax =
1117 mnt->acdirmin = mnt->acdirmax = option;
1118 break;
1119 case Opt_namelen:
1120 if (match_int(args, &option) || option < 0) {
1121 errors++;
1122 nfs_parse_invalid_value("namlen");
1123 } else
1124 mnt->namlen = option;
1125 break;
1126 case Opt_mountport:
1127 if (match_int(args, &option) ||
1128 option < 0 || option > USHORT_MAX) {
1129 errors++;
1130 nfs_parse_invalid_value("mountport");
1131 } else
1132 mnt->mount_server.port = option;
1133 break;
1134 case Opt_mountvers:
1135 if (match_int(args, &option) ||
1136 option < NFS_MNT_VERSION ||
1137 option > NFS_MNT3_VERSION) {
1138 errors++;
1139 nfs_parse_invalid_value("mountvers");
1140 } else
1141 mnt->mount_server.version = option;
1142 break;
1143 case Opt_nfsvers:
1144 if (match_int(args, &option)) {
1145 errors++;
1146 nfs_parse_invalid_value("nfsvers");
1147 break;
1148 }
1149 switch (option) {
1150 case NFS2_VERSION:
1151 mnt->flags &= ~NFS_MOUNT_VER3;
1152 break;
1153 case NFS3_VERSION:
1154 mnt->flags |= NFS_MOUNT_VER3;
1155 break;
1156 default:
1157 errors++;
1158 nfs_parse_invalid_value("nfsvers");
1159 }
1160 break;
1161
1162 /*
1163 * options that take text values
1164 */
1165 case Opt_sec:
1166 string = match_strdup(args);
1167 if (string == NULL)
1168 goto out_nomem;
1169 rc = nfs_parse_security_flavors(string, mnt);
1170 kfree(string);
1171 if (!rc) {
1172 errors++;
1173 dfprintk(MOUNT, "NFS: unrecognized "
1174 "security flavor\n");
1175 }
1176 break;
1177 case Opt_proto:
1178 string = match_strdup(args);
1179 if (string == NULL)
1180 goto out_nomem;
1181 token = match_token(string,
1182 nfs_xprt_protocol_tokens, args);
1183 kfree(string);
1184
1185 switch (token) {
1186 case Opt_xprt_udp:
1187 mnt->flags &= ~NFS_MOUNT_TCP;
1188 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1189 break;
1190 case Opt_xprt_tcp:
1191 mnt->flags |= NFS_MOUNT_TCP;
1192 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1193 break;
1194 case Opt_xprt_rdma:
1195 /* vector side protocols to TCP */
1196 mnt->flags |= NFS_MOUNT_TCP;
1197 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1198 break;
1199 default:
1200 errors++;
1201 dfprintk(MOUNT, "NFS: unrecognized "
1202 "transport protocol\n");
1203 }
1204 break;
1205 case Opt_mountproto:
1206 string = match_strdup(args);
1207 if (string == NULL)
1208 goto out_nomem;
1209 token = match_token(string,
1210 nfs_xprt_protocol_tokens, args);
1211 kfree(string);
1212
1213 switch (token) {
1214 case Opt_xprt_udp:
1215 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1216 break;
1217 case Opt_xprt_tcp:
1218 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1219 break;
1220 case Opt_xprt_rdma: /* not used for side protocols */
1221 default:
1222 errors++;
1223 dfprintk(MOUNT, "NFS: unrecognized "
1224 "transport protocol\n");
1225 }
1226 break;
1227 case Opt_addr:
1228 string = match_strdup(args);
1229 if (string == NULL)
1230 goto out_nomem;
1231 nfs_parse_ip_address(string, strlen(string),
1232 (struct sockaddr *)
1233 &mnt->nfs_server.address,
1234 &mnt->nfs_server.addrlen);
1235 kfree(string);
1236 break;
1237 case Opt_clientaddr:
1238 string = match_strdup(args);
1239 if (string == NULL)
1240 goto out_nomem;
1241 kfree(mnt->client_address);
1242 mnt->client_address = string;
1243 break;
1244 case Opt_mounthost:
1245 string = match_strdup(args);
1246 if (string == NULL)
1247 goto out_nomem;
1248 kfree(mnt->mount_server.hostname);
1249 mnt->mount_server.hostname = string;
1250 break;
1251 case Opt_mountaddr:
1252 string = match_strdup(args);
1253 if (string == NULL)
1254 goto out_nomem;
1255 nfs_parse_ip_address(string, strlen(string),
1256 (struct sockaddr *)
1257 &mnt->mount_server.address,
1258 &mnt->mount_server.addrlen);
1259 kfree(string);
1260 break;
1261
1262 /*
1263 * Special options
1264 */
1265 case Opt_sloppy:
1266 sloppy = 1;
1267 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1268 break;
1269 case Opt_userspace:
1270 case Opt_deprecated:
1271 dfprintk(MOUNT, "NFS: ignoring mount option "
1272 "'%s'\n", p);
1273 break;
1274
1275 default:
1276 errors++;
1277 dfprintk(MOUNT, "NFS: unrecognized mount option "
1278 "'%s'\n", p);
1279 }
1280 }
1281
1282 if (errors > 0) {
1283 dfprintk(MOUNT, "NFS: parsing encountered %d error%s\n",
1284 errors, (errors == 1 ? "" : "s"));
1285 if (!sloppy)
1286 return 0;
1287 }
1288 return 1;
1289
1290 out_nomem:
1291 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1292 return 0;
1293 out_security_failure:
1294 free_secdata(secdata);
1295 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1296 return 0;
1297 }
1298
1299 /*
1300 * Use the remote server's MOUNT service to request the NFS file handle
1301 * corresponding to the provided path.
1302 */
1303 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1304 struct nfs_fh *root_fh)
1305 {
1306 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1307 char *hostname;
1308 int status;
1309
1310 if (args->mount_server.version == 0) {
1311 if (args->flags & NFS_MOUNT_VER3)
1312 args->mount_server.version = NFS_MNT3_VERSION;
1313 else
1314 args->mount_server.version = NFS_MNT_VERSION;
1315 }
1316
1317 if (args->mount_server.hostname)
1318 hostname = args->mount_server.hostname;
1319 else
1320 hostname = args->nfs_server.hostname;
1321
1322 /*
1323 * Construct the mount server's address.
1324 */
1325 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1326 memcpy(sap, &args->nfs_server.address,
1327 args->nfs_server.addrlen);
1328 args->mount_server.addrlen = args->nfs_server.addrlen;
1329 }
1330
1331 /*
1332 * autobind will be used if mount_server.port == 0
1333 */
1334 nfs_set_port(sap, args->mount_server.port);
1335
1336 /*
1337 * Now ask the mount server to map our export path
1338 * to a file handle.
1339 */
1340 status = nfs_mount(sap,
1341 args->mount_server.addrlen,
1342 hostname,
1343 args->nfs_server.export_path,
1344 args->mount_server.version,
1345 args->mount_server.protocol,
1346 root_fh);
1347 if (status == 0)
1348 return 0;
1349
1350 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1351 hostname, status);
1352 return status;
1353 }
1354
1355 static int nfs_parse_simple_hostname(const char *dev_name,
1356 char **hostname, size_t maxnamlen,
1357 char **export_path, size_t maxpathlen)
1358 {
1359 size_t len;
1360 char *colon, *comma;
1361
1362 colon = strchr(dev_name, ':');
1363 if (colon == NULL)
1364 goto out_bad_devname;
1365
1366 len = colon - dev_name;
1367 if (len > maxnamlen)
1368 goto out_hostname;
1369
1370 /* N.B. caller will free nfs_server.hostname in all cases */
1371 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1372 if (!*hostname)
1373 goto out_nomem;
1374
1375 /* kill possible hostname list: not supported */
1376 comma = strchr(*hostname, ',');
1377 if (comma != NULL) {
1378 if (comma == *hostname)
1379 goto out_bad_devname;
1380 *comma = '\0';
1381 }
1382
1383 colon++;
1384 len = strlen(colon);
1385 if (len > maxpathlen)
1386 goto out_path;
1387 *export_path = kstrndup(colon, len, GFP_KERNEL);
1388 if (!*export_path)
1389 goto out_nomem;
1390
1391 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1392 return 0;
1393
1394 out_bad_devname:
1395 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1396 return -EINVAL;
1397
1398 out_nomem:
1399 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1400 return -ENOMEM;
1401
1402 out_hostname:
1403 dfprintk(MOUNT, "NFS: server hostname too long\n");
1404 return -ENAMETOOLONG;
1405
1406 out_path:
1407 dfprintk(MOUNT, "NFS: export pathname too long\n");
1408 return -ENAMETOOLONG;
1409 }
1410
1411 /*
1412 * Hostname has square brackets around it because it contains one or
1413 * more colons. We look for the first closing square bracket, and a
1414 * colon must follow it.
1415 */
1416 static int nfs_parse_protected_hostname(const char *dev_name,
1417 char **hostname, size_t maxnamlen,
1418 char **export_path, size_t maxpathlen)
1419 {
1420 size_t len;
1421 char *start, *end;
1422
1423 start = (char *)(dev_name + 1);
1424
1425 end = strchr(start, ']');
1426 if (end == NULL)
1427 goto out_bad_devname;
1428 if (*(end + 1) != ':')
1429 goto out_bad_devname;
1430
1431 len = end - start;
1432 if (len > maxnamlen)
1433 goto out_hostname;
1434
1435 /* N.B. caller will free nfs_server.hostname in all cases */
1436 *hostname = kstrndup(start, len, GFP_KERNEL);
1437 if (*hostname == NULL)
1438 goto out_nomem;
1439
1440 end += 2;
1441 len = strlen(end);
1442 if (len > maxpathlen)
1443 goto out_path;
1444 *export_path = kstrndup(end, len, GFP_KERNEL);
1445 if (!*export_path)
1446 goto out_nomem;
1447
1448 return 0;
1449
1450 out_bad_devname:
1451 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1452 return -EINVAL;
1453
1454 out_nomem:
1455 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1456 return -ENOMEM;
1457
1458 out_hostname:
1459 dfprintk(MOUNT, "NFS: server hostname too long\n");
1460 return -ENAMETOOLONG;
1461
1462 out_path:
1463 dfprintk(MOUNT, "NFS: export pathname too long\n");
1464 return -ENAMETOOLONG;
1465 }
1466
1467 /*
1468 * Split "dev_name" into "hostname:export_path".
1469 *
1470 * The leftmost colon demarks the split between the server's hostname
1471 * and the export path. If the hostname starts with a left square
1472 * bracket, then it may contain colons.
1473 *
1474 * Note: caller frees hostname and export path, even on error.
1475 */
1476 static int nfs_parse_devname(const char *dev_name,
1477 char **hostname, size_t maxnamlen,
1478 char **export_path, size_t maxpathlen)
1479 {
1480 if (*dev_name == '[')
1481 return nfs_parse_protected_hostname(dev_name,
1482 hostname, maxnamlen,
1483 export_path, maxpathlen);
1484
1485 return nfs_parse_simple_hostname(dev_name,
1486 hostname, maxnamlen,
1487 export_path, maxpathlen);
1488 }
1489
1490 /*
1491 * Validate the NFS2/NFS3 mount data
1492 * - fills in the mount root filehandle
1493 *
1494 * For option strings, user space handles the following behaviors:
1495 *
1496 * + DNS: mapping server host name to IP address ("addr=" option)
1497 *
1498 * + failure mode: how to behave if a mount request can't be handled
1499 * immediately ("fg/bg" option)
1500 *
1501 * + retry: how often to retry a mount request ("retry=" option)
1502 *
1503 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1504 * mountproto=tcp after mountproto=udp, and so on
1505 */
1506 static int nfs_validate_mount_data(void *options,
1507 struct nfs_parsed_mount_data *args,
1508 struct nfs_fh *mntfh,
1509 const char *dev_name)
1510 {
1511 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1512
1513 if (data == NULL)
1514 goto out_no_data;
1515
1516 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1517 args->rsize = NFS_MAX_FILE_IO_SIZE;
1518 args->wsize = NFS_MAX_FILE_IO_SIZE;
1519 args->acregmin = NFS_DEF_ACREGMIN;
1520 args->acregmax = NFS_DEF_ACREGMAX;
1521 args->acdirmin = NFS_DEF_ACDIRMIN;
1522 args->acdirmax = NFS_DEF_ACDIRMAX;
1523 args->mount_server.port = 0; /* autobind unless user sets port */
1524 args->nfs_server.port = 0; /* autobind unless user sets port */
1525 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1526 args->auth_flavors[0] = RPC_AUTH_UNIX;
1527
1528 switch (data->version) {
1529 case 1:
1530 data->namlen = 0;
1531 case 2:
1532 data->bsize = 0;
1533 case 3:
1534 if (data->flags & NFS_MOUNT_VER3)
1535 goto out_no_v3;
1536 data->root.size = NFS2_FHSIZE;
1537 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1538 case 4:
1539 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1540 goto out_no_sec;
1541 case 5:
1542 memset(data->context, 0, sizeof(data->context));
1543 case 6:
1544 if (data->flags & NFS_MOUNT_VER3) {
1545 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1546 goto out_invalid_fh;
1547 mntfh->size = data->root.size;
1548 } else
1549 mntfh->size = NFS2_FHSIZE;
1550
1551
1552 memcpy(mntfh->data, data->root.data, mntfh->size);
1553 if (mntfh->size < sizeof(mntfh->data))
1554 memset(mntfh->data + mntfh->size, 0,
1555 sizeof(mntfh->data) - mntfh->size);
1556
1557 /*
1558 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1559 * can deal with.
1560 */
1561 args->flags = data->flags;
1562 args->rsize = data->rsize;
1563 args->wsize = data->wsize;
1564 args->timeo = data->timeo;
1565 args->retrans = data->retrans;
1566 args->acregmin = data->acregmin;
1567 args->acregmax = data->acregmax;
1568 args->acdirmin = data->acdirmin;
1569 args->acdirmax = data->acdirmax;
1570
1571 memcpy(&args->nfs_server.address, &data->addr,
1572 sizeof(data->addr));
1573 args->nfs_server.addrlen = sizeof(data->addr);
1574 if (!nfs_verify_server_address((struct sockaddr *)
1575 &args->nfs_server.address))
1576 goto out_no_address;
1577
1578 if (!(data->flags & NFS_MOUNT_TCP))
1579 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1580 /* N.B. caller will free nfs_server.hostname in all cases */
1581 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1582 args->namlen = data->namlen;
1583 args->bsize = data->bsize;
1584
1585 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1586 args->auth_flavors[0] = data->pseudoflavor;
1587 if (!args->nfs_server.hostname)
1588 goto out_nomem;
1589
1590 /*
1591 * The legacy version 6 binary mount data from userspace has a
1592 * field used only to transport selinux information into the
1593 * the kernel. To continue to support that functionality we
1594 * have a touch of selinux knowledge here in the NFS code. The
1595 * userspace code converted context=blah to just blah so we are
1596 * converting back to the full string selinux understands.
1597 */
1598 if (data->context[0]){
1599 #ifdef CONFIG_SECURITY_SELINUX
1600 int rc;
1601 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1602 if (!opts_str)
1603 return -ENOMEM;
1604 strcpy(opts_str, "context=");
1605 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1606 strcat(opts_str, &data->context[0]);
1607 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1608 kfree(opts_str);
1609 if (rc)
1610 return rc;
1611 #else
1612 return -EINVAL;
1613 #endif
1614 }
1615
1616 break;
1617 default: {
1618 int status;
1619
1620 if (nfs_parse_mount_options((char *)options, args) == 0)
1621 return -EINVAL;
1622
1623 if (!nfs_verify_server_address((struct sockaddr *)
1624 &args->nfs_server.address))
1625 goto out_no_address;
1626
1627 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1628 args->nfs_server.port);
1629
1630 nfs_set_mount_transport_protocol(args);
1631
1632 status = nfs_parse_devname(dev_name,
1633 &args->nfs_server.hostname,
1634 PAGE_SIZE,
1635 &args->nfs_server.export_path,
1636 NFS_MAXPATHLEN);
1637 if (!status)
1638 status = nfs_try_mount(args, mntfh);
1639
1640 kfree(args->nfs_server.export_path);
1641 args->nfs_server.export_path = NULL;
1642
1643 if (status)
1644 return status;
1645
1646 break;
1647 }
1648 }
1649
1650 #ifndef CONFIG_NFS_V3
1651 if (args->flags & NFS_MOUNT_VER3)
1652 goto out_v3_not_compiled;
1653 #endif /* !CONFIG_NFS_V3 */
1654
1655 return 0;
1656
1657 out_no_data:
1658 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1659 return -EINVAL;
1660
1661 out_no_v3:
1662 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1663 data->version);
1664 return -EINVAL;
1665
1666 out_no_sec:
1667 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1668 return -EINVAL;
1669
1670 #ifndef CONFIG_NFS_V3
1671 out_v3_not_compiled:
1672 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1673 return -EPROTONOSUPPORT;
1674 #endif /* !CONFIG_NFS_V3 */
1675
1676 out_nomem:
1677 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1678 return -ENOMEM;
1679
1680 out_no_address:
1681 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1682 return -EINVAL;
1683
1684 out_invalid_fh:
1685 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1686 return -EINVAL;
1687 }
1688
1689 static int
1690 nfs_compare_remount_data(struct nfs_server *nfss,
1691 struct nfs_parsed_mount_data *data)
1692 {
1693 if (data->flags != nfss->flags ||
1694 data->rsize != nfss->rsize ||
1695 data->wsize != nfss->wsize ||
1696 data->retrans != nfss->client->cl_timeout->to_retries ||
1697 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1698 data->acregmin != nfss->acregmin / HZ ||
1699 data->acregmax != nfss->acregmax / HZ ||
1700 data->acdirmin != nfss->acdirmin / HZ ||
1701 data->acdirmax != nfss->acdirmax / HZ ||
1702 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1703 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1704 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1705 data->nfs_server.addrlen) != 0)
1706 return -EINVAL;
1707
1708 return 0;
1709 }
1710
1711 static int
1712 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1713 {
1714 int error;
1715 struct nfs_server *nfss = sb->s_fs_info;
1716 struct nfs_parsed_mount_data *data;
1717 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1718 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1719 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1720
1721 /*
1722 * Userspace mount programs that send binary options generally send
1723 * them populated with default values. We have no way to know which
1724 * ones were explicitly specified. Fall back to legacy behavior and
1725 * just return success.
1726 */
1727 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1728 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1729 options->version <= 6))))
1730 return 0;
1731
1732 data = kzalloc(sizeof(*data), GFP_KERNEL);
1733 if (data == NULL)
1734 return -ENOMEM;
1735
1736 /* fill out struct with values from existing mount */
1737 data->flags = nfss->flags;
1738 data->rsize = nfss->rsize;
1739 data->wsize = nfss->wsize;
1740 data->retrans = nfss->client->cl_timeout->to_retries;
1741 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1742 data->acregmin = nfss->acregmin / HZ;
1743 data->acregmax = nfss->acregmax / HZ;
1744 data->acdirmin = nfss->acdirmin / HZ;
1745 data->acdirmax = nfss->acdirmax / HZ;
1746 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1747 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1748 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1749 data->nfs_server.addrlen);
1750
1751 /* overwrite those values with any that were specified */
1752 error = nfs_parse_mount_options((char *)options, data);
1753 if (error < 0)
1754 goto out;
1755
1756 /* compare new mount options with old ones */
1757 error = nfs_compare_remount_data(nfss, data);
1758 out:
1759 kfree(data);
1760 return error;
1761 }
1762
1763 /*
1764 * Initialise the common bits of the superblock
1765 */
1766 static inline void nfs_initialise_sb(struct super_block *sb)
1767 {
1768 struct nfs_server *server = NFS_SB(sb);
1769
1770 sb->s_magic = NFS_SUPER_MAGIC;
1771
1772 /* We probably want something more informative here */
1773 snprintf(sb->s_id, sizeof(sb->s_id),
1774 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1775
1776 if (sb->s_blocksize == 0)
1777 sb->s_blocksize = nfs_block_bits(server->wsize,
1778 &sb->s_blocksize_bits);
1779
1780 if (server->flags & NFS_MOUNT_NOAC)
1781 sb->s_flags |= MS_SYNCHRONOUS;
1782
1783 nfs_super_set_maxbytes(sb, server->maxfilesize);
1784 }
1785
1786 /*
1787 * Finish setting up an NFS2/3 superblock
1788 */
1789 static void nfs_fill_super(struct super_block *sb,
1790 struct nfs_parsed_mount_data *data)
1791 {
1792 struct nfs_server *server = NFS_SB(sb);
1793
1794 sb->s_blocksize_bits = 0;
1795 sb->s_blocksize = 0;
1796 if (data->bsize)
1797 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1798
1799 if (server->flags & NFS_MOUNT_VER3) {
1800 /* The VFS shouldn't apply the umask to mode bits. We will do
1801 * so ourselves when necessary.
1802 */
1803 sb->s_flags |= MS_POSIXACL;
1804 sb->s_time_gran = 1;
1805 }
1806
1807 sb->s_op = &nfs_sops;
1808 nfs_initialise_sb(sb);
1809 }
1810
1811 /*
1812 * Finish setting up a cloned NFS2/3 superblock
1813 */
1814 static void nfs_clone_super(struct super_block *sb,
1815 const struct super_block *old_sb)
1816 {
1817 struct nfs_server *server = NFS_SB(sb);
1818
1819 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1820 sb->s_blocksize = old_sb->s_blocksize;
1821 sb->s_maxbytes = old_sb->s_maxbytes;
1822
1823 if (server->flags & NFS_MOUNT_VER3) {
1824 /* The VFS shouldn't apply the umask to mode bits. We will do
1825 * so ourselves when necessary.
1826 */
1827 sb->s_flags |= MS_POSIXACL;
1828 sb->s_time_gran = 1;
1829 }
1830
1831 sb->s_op = old_sb->s_op;
1832 nfs_initialise_sb(sb);
1833 }
1834
1835 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1836
1837 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1838 {
1839 const struct nfs_server *a = s->s_fs_info;
1840 const struct rpc_clnt *clnt_a = a->client;
1841 const struct rpc_clnt *clnt_b = b->client;
1842
1843 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1844 goto Ebusy;
1845 if (a->nfs_client != b->nfs_client)
1846 goto Ebusy;
1847 if (a->flags != b->flags)
1848 goto Ebusy;
1849 if (a->wsize != b->wsize)
1850 goto Ebusy;
1851 if (a->rsize != b->rsize)
1852 goto Ebusy;
1853 if (a->acregmin != b->acregmin)
1854 goto Ebusy;
1855 if (a->acregmax != b->acregmax)
1856 goto Ebusy;
1857 if (a->acdirmin != b->acdirmin)
1858 goto Ebusy;
1859 if (a->acdirmax != b->acdirmax)
1860 goto Ebusy;
1861 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1862 goto Ebusy;
1863 return 1;
1864 Ebusy:
1865 return 0;
1866 }
1867
1868 struct nfs_sb_mountdata {
1869 struct nfs_server *server;
1870 int mntflags;
1871 };
1872
1873 static int nfs_set_super(struct super_block *s, void *data)
1874 {
1875 struct nfs_sb_mountdata *sb_mntdata = data;
1876 struct nfs_server *server = sb_mntdata->server;
1877 int ret;
1878
1879 s->s_flags = sb_mntdata->mntflags;
1880 s->s_fs_info = server;
1881 ret = set_anon_super(s, server);
1882 if (ret == 0)
1883 server->s_dev = s->s_dev;
1884 return ret;
1885 }
1886
1887 static int nfs_compare_super_address(struct nfs_server *server1,
1888 struct nfs_server *server2)
1889 {
1890 struct sockaddr *sap1, *sap2;
1891
1892 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1893 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1894
1895 if (sap1->sa_family != sap2->sa_family)
1896 return 0;
1897
1898 switch (sap1->sa_family) {
1899 case AF_INET: {
1900 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1901 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1902 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1903 return 0;
1904 if (sin1->sin_port != sin2->sin_port)
1905 return 0;
1906 break;
1907 }
1908 case AF_INET6: {
1909 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1910 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1911 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1912 return 0;
1913 if (sin1->sin6_port != sin2->sin6_port)
1914 return 0;
1915 break;
1916 }
1917 default:
1918 return 0;
1919 }
1920
1921 return 1;
1922 }
1923
1924 static int nfs_compare_super(struct super_block *sb, void *data)
1925 {
1926 struct nfs_sb_mountdata *sb_mntdata = data;
1927 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1928 int mntflags = sb_mntdata->mntflags;
1929
1930 if (!nfs_compare_super_address(old, server))
1931 return 0;
1932 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1933 if (old->flags & NFS_MOUNT_UNSHARED)
1934 return 0;
1935 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1936 return 0;
1937 return nfs_compare_mount_options(sb, server, mntflags);
1938 }
1939
1940 static int nfs_bdi_register(struct nfs_server *server)
1941 {
1942 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1943 }
1944
1945 static int nfs_get_sb(struct file_system_type *fs_type,
1946 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1947 {
1948 struct nfs_server *server = NULL;
1949 struct super_block *s;
1950 struct nfs_parsed_mount_data *data;
1951 struct nfs_fh *mntfh;
1952 struct dentry *mntroot;
1953 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1954 struct nfs_sb_mountdata sb_mntdata = {
1955 .mntflags = flags,
1956 };
1957 int error = -ENOMEM;
1958
1959 data = kzalloc(sizeof(*data), GFP_KERNEL);
1960 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1961 if (data == NULL || mntfh == NULL)
1962 goto out_free_fh;
1963
1964 security_init_mnt_opts(&data->lsm_opts);
1965
1966 /* Validate the mount data */
1967 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1968 if (error < 0)
1969 goto out;
1970
1971 /* Get a volume representation */
1972 server = nfs_create_server(data, mntfh);
1973 if (IS_ERR(server)) {
1974 error = PTR_ERR(server);
1975 goto out;
1976 }
1977 sb_mntdata.server = server;
1978
1979 if (server->flags & NFS_MOUNT_UNSHARED)
1980 compare_super = NULL;
1981
1982 /* Get a superblock - note that we may end up sharing one that already exists */
1983 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1984 if (IS_ERR(s)) {
1985 error = PTR_ERR(s);
1986 goto out_err_nosb;
1987 }
1988
1989 if (s->s_fs_info != server) {
1990 nfs_free_server(server);
1991 server = NULL;
1992 } else {
1993 error = nfs_bdi_register(server);
1994 if (error)
1995 goto error_splat_super;
1996 }
1997
1998 if (!s->s_root) {
1999 /* initial superblock/root creation */
2000 nfs_fill_super(s, data);
2001 }
2002
2003 mntroot = nfs_get_root(s, mntfh);
2004 if (IS_ERR(mntroot)) {
2005 error = PTR_ERR(mntroot);
2006 goto error_splat_super;
2007 }
2008
2009 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2010 if (error)
2011 goto error_splat_root;
2012
2013 s->s_flags |= MS_ACTIVE;
2014 mnt->mnt_sb = s;
2015 mnt->mnt_root = mntroot;
2016 error = 0;
2017
2018 out:
2019 kfree(data->nfs_server.hostname);
2020 kfree(data->mount_server.hostname);
2021 security_free_mnt_opts(&data->lsm_opts);
2022 out_free_fh:
2023 kfree(mntfh);
2024 kfree(data);
2025 return error;
2026
2027 out_err_nosb:
2028 nfs_free_server(server);
2029 goto out;
2030
2031 error_splat_root:
2032 dput(mntroot);
2033 error_splat_super:
2034 up_write(&s->s_umount);
2035 deactivate_super(s);
2036 goto out;
2037 }
2038
2039 /*
2040 * Destroy an NFS2/3 superblock
2041 */
2042 static void nfs_kill_super(struct super_block *s)
2043 {
2044 struct nfs_server *server = NFS_SB(s);
2045
2046 bdi_unregister(&server->backing_dev_info);
2047 kill_anon_super(s);
2048 nfs_free_server(server);
2049 }
2050
2051 /*
2052 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2053 */
2054 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2055 const char *dev_name, void *raw_data,
2056 struct vfsmount *mnt)
2057 {
2058 struct nfs_clone_mount *data = raw_data;
2059 struct super_block *s;
2060 struct nfs_server *server;
2061 struct dentry *mntroot;
2062 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2063 struct nfs_sb_mountdata sb_mntdata = {
2064 .mntflags = flags,
2065 };
2066 int error;
2067
2068 dprintk("--> nfs_xdev_get_sb()\n");
2069
2070 /* create a new volume representation */
2071 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2072 if (IS_ERR(server)) {
2073 error = PTR_ERR(server);
2074 goto out_err_noserver;
2075 }
2076 sb_mntdata.server = server;
2077
2078 if (server->flags & NFS_MOUNT_UNSHARED)
2079 compare_super = NULL;
2080
2081 /* Get a superblock - note that we may end up sharing one that already exists */
2082 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2083 if (IS_ERR(s)) {
2084 error = PTR_ERR(s);
2085 goto out_err_nosb;
2086 }
2087
2088 if (s->s_fs_info != server) {
2089 nfs_free_server(server);
2090 server = NULL;
2091 } else {
2092 error = nfs_bdi_register(server);
2093 if (error)
2094 goto error_splat_super;
2095 }
2096
2097 if (!s->s_root) {
2098 /* initial superblock/root creation */
2099 nfs_clone_super(s, data->sb);
2100 }
2101
2102 mntroot = nfs_get_root(s, data->fh);
2103 if (IS_ERR(mntroot)) {
2104 error = PTR_ERR(mntroot);
2105 goto error_splat_super;
2106 }
2107 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2108 dput(mntroot);
2109 error = -ESTALE;
2110 goto error_splat_super;
2111 }
2112
2113 s->s_flags |= MS_ACTIVE;
2114 mnt->mnt_sb = s;
2115 mnt->mnt_root = mntroot;
2116
2117 /* clone any lsm security options from the parent to the new sb */
2118 security_sb_clone_mnt_opts(data->sb, s);
2119
2120 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2121 return 0;
2122
2123 out_err_nosb:
2124 nfs_free_server(server);
2125 out_err_noserver:
2126 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2127 return error;
2128
2129 error_splat_super:
2130 up_write(&s->s_umount);
2131 deactivate_super(s);
2132 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2133 return error;
2134 }
2135
2136 #ifdef CONFIG_NFS_V4
2137
2138 /*
2139 * Finish setting up a cloned NFS4 superblock
2140 */
2141 static void nfs4_clone_super(struct super_block *sb,
2142 const struct super_block *old_sb)
2143 {
2144 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2145 sb->s_blocksize = old_sb->s_blocksize;
2146 sb->s_maxbytes = old_sb->s_maxbytes;
2147 sb->s_time_gran = 1;
2148 sb->s_op = old_sb->s_op;
2149 nfs_initialise_sb(sb);
2150 }
2151
2152 /*
2153 * Set up an NFS4 superblock
2154 */
2155 static void nfs4_fill_super(struct super_block *sb)
2156 {
2157 sb->s_time_gran = 1;
2158 sb->s_op = &nfs4_sops;
2159 nfs_initialise_sb(sb);
2160 }
2161
2162 /*
2163 * Validate NFSv4 mount options
2164 */
2165 static int nfs4_validate_mount_data(void *options,
2166 struct nfs_parsed_mount_data *args,
2167 const char *dev_name)
2168 {
2169 struct sockaddr_in *ap;
2170 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2171 char *c;
2172
2173 if (data == NULL)
2174 goto out_no_data;
2175
2176 args->rsize = NFS_MAX_FILE_IO_SIZE;
2177 args->wsize = NFS_MAX_FILE_IO_SIZE;
2178 args->acregmin = NFS_DEF_ACREGMIN;
2179 args->acregmax = NFS_DEF_ACREGMAX;
2180 args->acdirmin = NFS_DEF_ACDIRMIN;
2181 args->acdirmax = NFS_DEF_ACDIRMAX;
2182 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2183 args->auth_flavors[0] = RPC_AUTH_UNIX;
2184 args->auth_flavor_len = 0;
2185
2186 switch (data->version) {
2187 case 1:
2188 ap = (struct sockaddr_in *)&args->nfs_server.address;
2189 if (data->host_addrlen > sizeof(args->nfs_server.address))
2190 goto out_no_address;
2191 if (data->host_addrlen == 0)
2192 goto out_no_address;
2193 args->nfs_server.addrlen = data->host_addrlen;
2194 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2195 return -EFAULT;
2196 if (!nfs_verify_server_address((struct sockaddr *)
2197 &args->nfs_server.address))
2198 goto out_no_address;
2199
2200 if (data->auth_flavourlen) {
2201 if (data->auth_flavourlen > 1)
2202 goto out_inval_auth;
2203 if (copy_from_user(&args->auth_flavors[0],
2204 data->auth_flavours,
2205 sizeof(args->auth_flavors[0])))
2206 return -EFAULT;
2207 }
2208
2209 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2210 if (IS_ERR(c))
2211 return PTR_ERR(c);
2212 args->nfs_server.hostname = c;
2213
2214 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2215 if (IS_ERR(c))
2216 return PTR_ERR(c);
2217 args->nfs_server.export_path = c;
2218 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2219
2220 c = strndup_user(data->client_addr.data, 16);
2221 if (IS_ERR(c))
2222 return PTR_ERR(c);
2223 args->client_address = c;
2224
2225 /*
2226 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2227 * can deal with.
2228 */
2229
2230 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2231 args->rsize = data->rsize;
2232 args->wsize = data->wsize;
2233 args->timeo = data->timeo;
2234 args->retrans = data->retrans;
2235 args->acregmin = data->acregmin;
2236 args->acregmax = data->acregmax;
2237 args->acdirmin = data->acdirmin;
2238 args->acdirmax = data->acdirmax;
2239 args->nfs_server.protocol = data->proto;
2240 nfs_validate_transport_protocol(args);
2241
2242 break;
2243 default: {
2244 int status;
2245
2246 if (nfs_parse_mount_options((char *)options, args) == 0)
2247 return -EINVAL;
2248
2249 if (!nfs_verify_server_address((struct sockaddr *)
2250 &args->nfs_server.address))
2251 return -EINVAL;
2252
2253 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2254 args->nfs_server.port);
2255
2256 nfs_validate_transport_protocol(args);
2257
2258 if (args->auth_flavor_len > 1)
2259 goto out_inval_auth;
2260
2261 if (args->client_address == NULL)
2262 goto out_no_client_address;
2263
2264 status = nfs_parse_devname(dev_name,
2265 &args->nfs_server.hostname,
2266 NFS4_MAXNAMLEN,
2267 &args->nfs_server.export_path,
2268 NFS4_MAXPATHLEN);
2269 if (status < 0)
2270 return status;
2271
2272 break;
2273 }
2274 }
2275
2276 return 0;
2277
2278 out_no_data:
2279 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2280 return -EINVAL;
2281
2282 out_inval_auth:
2283 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2284 data->auth_flavourlen);
2285 return -EINVAL;
2286
2287 out_no_address:
2288 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2289 return -EINVAL;
2290
2291 out_no_client_address:
2292 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2293 return -EINVAL;
2294 }
2295
2296 /*
2297 * Get the superblock for an NFS4 mountpoint
2298 */
2299 static int nfs4_get_sb(struct file_system_type *fs_type,
2300 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2301 {
2302 struct nfs_parsed_mount_data *data;
2303 struct super_block *s;
2304 struct nfs_server *server;
2305 struct nfs_fh *mntfh;
2306 struct dentry *mntroot;
2307 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2308 struct nfs_sb_mountdata sb_mntdata = {
2309 .mntflags = flags,
2310 };
2311 int error = -ENOMEM;
2312
2313 data = kzalloc(sizeof(*data), GFP_KERNEL);
2314 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2315 if (data == NULL || mntfh == NULL)
2316 goto out_free_fh;
2317
2318 security_init_mnt_opts(&data->lsm_opts);
2319
2320 /* Validate the mount data */
2321 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2322 if (error < 0)
2323 goto out;
2324
2325 /* Get a volume representation */
2326 server = nfs4_create_server(data, mntfh);
2327 if (IS_ERR(server)) {
2328 error = PTR_ERR(server);
2329 goto out;
2330 }
2331 sb_mntdata.server = server;
2332
2333 if (server->flags & NFS4_MOUNT_UNSHARED)
2334 compare_super = NULL;
2335
2336 /* Get a superblock - note that we may end up sharing one that already exists */
2337 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2338 if (IS_ERR(s)) {
2339 error = PTR_ERR(s);
2340 goto out_free;
2341 }
2342
2343 if (s->s_fs_info != server) {
2344 nfs_free_server(server);
2345 server = NULL;
2346 } else {
2347 error = nfs_bdi_register(server);
2348 if (error)
2349 goto error_splat_super;
2350 }
2351
2352 if (!s->s_root) {
2353 /* initial superblock/root creation */
2354 nfs4_fill_super(s);
2355 }
2356
2357 mntroot = nfs4_get_root(s, mntfh);
2358 if (IS_ERR(mntroot)) {
2359 error = PTR_ERR(mntroot);
2360 goto error_splat_super;
2361 }
2362
2363 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2364 if (error)
2365 goto error_splat_root;
2366
2367 s->s_flags |= MS_ACTIVE;
2368 mnt->mnt_sb = s;
2369 mnt->mnt_root = mntroot;
2370 error = 0;
2371
2372 out:
2373 kfree(data->client_address);
2374 kfree(data->nfs_server.export_path);
2375 kfree(data->nfs_server.hostname);
2376 security_free_mnt_opts(&data->lsm_opts);
2377 out_free_fh:
2378 kfree(mntfh);
2379 kfree(data);
2380 return error;
2381
2382 out_free:
2383 nfs_free_server(server);
2384 goto out;
2385
2386 error_splat_root:
2387 dput(mntroot);
2388 error_splat_super:
2389 up_write(&s->s_umount);
2390 deactivate_super(s);
2391 goto out;
2392 }
2393
2394 static void nfs4_kill_super(struct super_block *sb)
2395 {
2396 struct nfs_server *server = NFS_SB(sb);
2397
2398 nfs_return_all_delegations(sb);
2399 kill_anon_super(sb);
2400
2401 nfs4_renewd_prepare_shutdown(server);
2402 nfs_free_server(server);
2403 }
2404
2405 /*
2406 * Clone an NFS4 server record on xdev traversal (FSID-change)
2407 */
2408 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2409 const char *dev_name, void *raw_data,
2410 struct vfsmount *mnt)
2411 {
2412 struct nfs_clone_mount *data = raw_data;
2413 struct super_block *s;
2414 struct nfs_server *server;
2415 struct dentry *mntroot;
2416 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2417 struct nfs_sb_mountdata sb_mntdata = {
2418 .mntflags = flags,
2419 };
2420 int error;
2421
2422 dprintk("--> nfs4_xdev_get_sb()\n");
2423
2424 /* create a new volume representation */
2425 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2426 if (IS_ERR(server)) {
2427 error = PTR_ERR(server);
2428 goto out_err_noserver;
2429 }
2430 sb_mntdata.server = server;
2431
2432 if (server->flags & NFS4_MOUNT_UNSHARED)
2433 compare_super = NULL;
2434
2435 /* Get a superblock - note that we may end up sharing one that already exists */
2436 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2437 if (IS_ERR(s)) {
2438 error = PTR_ERR(s);
2439 goto out_err_nosb;
2440 }
2441
2442 if (s->s_fs_info != server) {
2443 nfs_free_server(server);
2444 server = NULL;
2445 } else {
2446 error = nfs_bdi_register(server);
2447 if (error)
2448 goto error_splat_super;
2449 }
2450
2451 if (!s->s_root) {
2452 /* initial superblock/root creation */
2453 nfs4_clone_super(s, data->sb);
2454 }
2455
2456 mntroot = nfs4_get_root(s, data->fh);
2457 if (IS_ERR(mntroot)) {
2458 error = PTR_ERR(mntroot);
2459 goto error_splat_super;
2460 }
2461 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2462 dput(mntroot);
2463 error = -ESTALE;
2464 goto error_splat_super;
2465 }
2466
2467 s->s_flags |= MS_ACTIVE;
2468 mnt->mnt_sb = s;
2469 mnt->mnt_root = mntroot;
2470
2471 security_sb_clone_mnt_opts(data->sb, s);
2472
2473 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2474 return 0;
2475
2476 out_err_nosb:
2477 nfs_free_server(server);
2478 out_err_noserver:
2479 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2480 return error;
2481
2482 error_splat_super:
2483 up_write(&s->s_umount);
2484 deactivate_super(s);
2485 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2486 return error;
2487 }
2488
2489 /*
2490 * Create an NFS4 server record on referral traversal
2491 */
2492 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2493 const char *dev_name, void *raw_data,
2494 struct vfsmount *mnt)
2495 {
2496 struct nfs_clone_mount *data = raw_data;
2497 struct super_block *s;
2498 struct nfs_server *server;
2499 struct dentry *mntroot;
2500 struct nfs_fh mntfh;
2501 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2502 struct nfs_sb_mountdata sb_mntdata = {
2503 .mntflags = flags,
2504 };
2505 int error;
2506
2507 dprintk("--> nfs4_referral_get_sb()\n");
2508
2509 /* create a new volume representation */
2510 server = nfs4_create_referral_server(data, &mntfh);
2511 if (IS_ERR(server)) {
2512 error = PTR_ERR(server);
2513 goto out_err_noserver;
2514 }
2515 sb_mntdata.server = server;
2516
2517 if (server->flags & NFS4_MOUNT_UNSHARED)
2518 compare_super = NULL;
2519
2520 /* Get a superblock - note that we may end up sharing one that already exists */
2521 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2522 if (IS_ERR(s)) {
2523 error = PTR_ERR(s);
2524 goto out_err_nosb;
2525 }
2526
2527 if (s->s_fs_info != server) {
2528 nfs_free_server(server);
2529 server = NULL;
2530 } else {
2531 error = nfs_bdi_register(server);
2532 if (error)
2533 goto error_splat_super;
2534 }
2535
2536 if (!s->s_root) {
2537 /* initial superblock/root creation */
2538 nfs4_fill_super(s);
2539 }
2540
2541 mntroot = nfs4_get_root(s, &mntfh);
2542 if (IS_ERR(mntroot)) {
2543 error = PTR_ERR(mntroot);
2544 goto error_splat_super;
2545 }
2546 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2547 dput(mntroot);
2548 error = -ESTALE;
2549 goto error_splat_super;
2550 }
2551
2552 s->s_flags |= MS_ACTIVE;
2553 mnt->mnt_sb = s;
2554 mnt->mnt_root = mntroot;
2555
2556 security_sb_clone_mnt_opts(data->sb, s);
2557
2558 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2559 return 0;
2560
2561 out_err_nosb:
2562 nfs_free_server(server);
2563 out_err_noserver:
2564 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2565 return error;
2566
2567 error_splat_super:
2568 up_write(&s->s_umount);
2569 deactivate_super(s);
2570 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2571 return error;
2572 }
2573
2574 #endif /* CONFIG_NFS_V4 */
SocketAccessConTroL development