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NFSv4: Replace nfs4_path_walk() with VFS path lookup in a private namespace
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfs / super.c
blob8e0673a0d6aac5fd7e8c22729b0b1769c96f9475
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/mnt_namespace.h>
46 #include <linux/namei.h>
47 #include <linux/nfs_idmap.h>
48 #include <linux/vfs.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <net/ipv6.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
59
60 #include "nfs4_fs.h"
61 #include "callback.h"
62 #include "delegation.h"
63 #include "iostat.h"
64 #include "internal.h"
65 #include "fscache.h"
66
67 #define NFSDBG_FACILITY NFSDBG_VFS
68
69 enum {
70 /* Mount options that take no arguments */
71 Opt_soft, Opt_hard,
72 Opt_posix, Opt_noposix,
73 Opt_cto, Opt_nocto,
74 Opt_ac, Opt_noac,
75 Opt_lock, Opt_nolock,
76 Opt_v2, Opt_v3,
77 Opt_udp, Opt_tcp, Opt_rdma,
78 Opt_acl, Opt_noacl,
79 Opt_rdirplus, Opt_nordirplus,
80 Opt_sharecache, Opt_nosharecache,
81 Opt_resvport, Opt_noresvport,
82 Opt_fscache, Opt_nofscache,
83
84 /* Mount options that take integer arguments */
85 Opt_port,
86 Opt_rsize, Opt_wsize, Opt_bsize,
87 Opt_timeo, Opt_retrans,
88 Opt_acregmin, Opt_acregmax,
89 Opt_acdirmin, Opt_acdirmax,
90 Opt_actimeo,
91 Opt_namelen,
92 Opt_mountport,
93 Opt_mountvers,
94 Opt_nfsvers,
95 Opt_minorversion,
96
97 /* Mount options that take string arguments */
98 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
99 Opt_addr, Opt_mountaddr, Opt_clientaddr,
100 Opt_lookupcache,
101 Opt_fscache_uniq,
102
103 /* Special mount options */
104 Opt_userspace, Opt_deprecated, Opt_sloppy,
105
106 Opt_err
107 };
108
109 static const match_table_t nfs_mount_option_tokens = {
110 { Opt_userspace, "bg" },
111 { Opt_userspace, "fg" },
112 { Opt_userspace, "retry=%s" },
113
114 { Opt_sloppy, "sloppy" },
115
116 { Opt_soft, "soft" },
117 { Opt_hard, "hard" },
118 { Opt_deprecated, "intr" },
119 { Opt_deprecated, "nointr" },
120 { Opt_posix, "posix" },
121 { Opt_noposix, "noposix" },
122 { Opt_cto, "cto" },
123 { Opt_nocto, "nocto" },
124 { Opt_ac, "ac" },
125 { Opt_noac, "noac" },
126 { Opt_lock, "lock" },
127 { Opt_nolock, "nolock" },
128 { Opt_v2, "v2" },
129 { Opt_v3, "v3" },
130 { Opt_udp, "udp" },
131 { Opt_tcp, "tcp" },
132 { Opt_rdma, "rdma" },
133 { Opt_acl, "acl" },
134 { Opt_noacl, "noacl" },
135 { Opt_rdirplus, "rdirplus" },
136 { Opt_nordirplus, "nordirplus" },
137 { Opt_sharecache, "sharecache" },
138 { Opt_nosharecache, "nosharecache" },
139 { Opt_resvport, "resvport" },
140 { Opt_noresvport, "noresvport" },
141 { Opt_fscache, "fsc" },
142 { Opt_fscache_uniq, "fsc=%s" },
143 { Opt_nofscache, "nofsc" },
144
145 { Opt_port, "port=%s" },
146 { Opt_rsize, "rsize=%s" },
147 { Opt_wsize, "wsize=%s" },
148 { Opt_bsize, "bsize=%s" },
149 { Opt_timeo, "timeo=%s" },
150 { Opt_retrans, "retrans=%s" },
151 { Opt_acregmin, "acregmin=%s" },
152 { Opt_acregmax, "acregmax=%s" },
153 { Opt_acdirmin, "acdirmin=%s" },
154 { Opt_acdirmax, "acdirmax=%s" },
155 { Opt_actimeo, "actimeo=%s" },
156 { Opt_namelen, "namlen=%s" },
157 { Opt_mountport, "mountport=%s" },
158 { Opt_mountvers, "mountvers=%s" },
159 { Opt_nfsvers, "nfsvers=%s" },
160 { Opt_nfsvers, "vers=%s" },
161 { Opt_minorversion, "minorversion=%u" },
162
163 { Opt_sec, "sec=%s" },
164 { Opt_proto, "proto=%s" },
165 { Opt_mountproto, "mountproto=%s" },
166 { Opt_addr, "addr=%s" },
167 { Opt_clientaddr, "clientaddr=%s" },
168 { Opt_mounthost, "mounthost=%s" },
169 { Opt_mountaddr, "mountaddr=%s" },
170
171 { Opt_lookupcache, "lookupcache=%s" },
172
173 { Opt_err, NULL }
174 };
175
176 enum {
177 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
178
179 Opt_xprt_err
180 };
181
182 static const match_table_t nfs_xprt_protocol_tokens = {
183 { Opt_xprt_udp, "udp" },
184 { Opt_xprt_tcp, "tcp" },
185 { Opt_xprt_rdma, "rdma" },
186
187 { Opt_xprt_err, NULL }
188 };
189
190 enum {
191 Opt_sec_none, Opt_sec_sys,
192 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
193 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
194 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
195
196 Opt_sec_err
197 };
198
199 static const match_table_t nfs_secflavor_tokens = {
200 { Opt_sec_none, "none" },
201 { Opt_sec_none, "null" },
202 { Opt_sec_sys, "sys" },
203
204 { Opt_sec_krb5, "krb5" },
205 { Opt_sec_krb5i, "krb5i" },
206 { Opt_sec_krb5p, "krb5p" },
207
208 { Opt_sec_lkey, "lkey" },
209 { Opt_sec_lkeyi, "lkeyi" },
210 { Opt_sec_lkeyp, "lkeyp" },
211
212 { Opt_sec_spkm, "spkm3" },
213 { Opt_sec_spkmi, "spkm3i" },
214 { Opt_sec_spkmp, "spkm3p" },
215
216 { Opt_sec_err, NULL }
217 };
218
219 enum {
220 Opt_lookupcache_all, Opt_lookupcache_positive,
221 Opt_lookupcache_none,
222
223 Opt_lookupcache_err
224 };
225
226 static match_table_t nfs_lookupcache_tokens = {
227 { Opt_lookupcache_all, "all" },
228 { Opt_lookupcache_positive, "pos" },
229 { Opt_lookupcache_positive, "positive" },
230 { Opt_lookupcache_none, "none" },
231
232 { Opt_lookupcache_err, NULL }
233 };
234
235
236 static void nfs_umount_begin(struct super_block *);
237 static int nfs_statfs(struct dentry *, struct kstatfs *);
238 static int nfs_show_options(struct seq_file *, struct vfsmount *);
239 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
240 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
241 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
242 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
243 static void nfs_kill_super(struct super_block *);
244 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
245
246 static struct file_system_type nfs_fs_type = {
247 .owner = THIS_MODULE,
248 .name = "nfs",
249 .get_sb = nfs_get_sb,
250 .kill_sb = nfs_kill_super,
251 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
252 };
253
254 struct file_system_type nfs_xdev_fs_type = {
255 .owner = THIS_MODULE,
256 .name = "nfs",
257 .get_sb = nfs_xdev_get_sb,
258 .kill_sb = nfs_kill_super,
259 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
260 };
261
262 static const struct super_operations nfs_sops = {
263 .alloc_inode = nfs_alloc_inode,
264 .destroy_inode = nfs_destroy_inode,
265 .write_inode = nfs_write_inode,
266 .statfs = nfs_statfs,
267 .clear_inode = nfs_clear_inode,
268 .umount_begin = nfs_umount_begin,
269 .show_options = nfs_show_options,
270 .show_stats = nfs_show_stats,
271 .remount_fs = nfs_remount,
272 };
273
274 #ifdef CONFIG_NFS_V4
275 static int nfs4_get_sb(struct file_system_type *fs_type,
276 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
277 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
278 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
279 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
280 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
281 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
282 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
283 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
284 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
285 static void nfs4_kill_super(struct super_block *sb);
286
287 static struct file_system_type nfs4_fs_type = {
288 .owner = THIS_MODULE,
289 .name = "nfs4",
290 .get_sb = nfs4_get_sb,
291 .kill_sb = nfs4_kill_super,
292 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
293 };
294
295 static struct file_system_type nfs4_remote_fs_type = {
296 .owner = THIS_MODULE,
297 .name = "nfs4",
298 .get_sb = nfs4_remote_get_sb,
299 .kill_sb = nfs4_kill_super,
300 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
301 };
302
303 struct file_system_type nfs4_xdev_fs_type = {
304 .owner = THIS_MODULE,
305 .name = "nfs4",
306 .get_sb = nfs4_xdev_get_sb,
307 .kill_sb = nfs4_kill_super,
308 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
309 };
310
311 static struct file_system_type nfs4_remote_referral_fs_type = {
312 .owner = THIS_MODULE,
313 .name = "nfs4",
314 .get_sb = nfs4_remote_referral_get_sb,
315 .kill_sb = nfs4_kill_super,
316 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
317 };
318
319 struct file_system_type nfs4_referral_fs_type = {
320 .owner = THIS_MODULE,
321 .name = "nfs4",
322 .get_sb = nfs4_referral_get_sb,
323 .kill_sb = nfs4_kill_super,
324 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
325 };
326
327 static const struct super_operations nfs4_sops = {
328 .alloc_inode = nfs_alloc_inode,
329 .destroy_inode = nfs_destroy_inode,
330 .write_inode = nfs_write_inode,
331 .statfs = nfs_statfs,
332 .clear_inode = nfs4_clear_inode,
333 .umount_begin = nfs_umount_begin,
334 .show_options = nfs_show_options,
335 .show_stats = nfs_show_stats,
336 .remount_fs = nfs_remount,
337 };
338 #endif
339
340 static struct shrinker acl_shrinker = {
341 .shrink = nfs_access_cache_shrinker,
342 .seeks = DEFAULT_SEEKS,
343 };
344
345 /*
346 * Register the NFS filesystems
347 */
348 int __init register_nfs_fs(void)
349 {
350 int ret;
351
352 ret = register_filesystem(&nfs_fs_type);
353 if (ret < 0)
354 goto error_0;
355
356 ret = nfs_register_sysctl();
357 if (ret < 0)
358 goto error_1;
359 #ifdef CONFIG_NFS_V4
360 ret = register_filesystem(&nfs4_fs_type);
361 if (ret < 0)
362 goto error_2;
363 #endif
364 register_shrinker(&acl_shrinker);
365 return 0;
366
367 #ifdef CONFIG_NFS_V4
368 error_2:
369 nfs_unregister_sysctl();
370 #endif
371 error_1:
372 unregister_filesystem(&nfs_fs_type);
373 error_0:
374 return ret;
375 }
376
377 /*
378 * Unregister the NFS filesystems
379 */
380 void __exit unregister_nfs_fs(void)
381 {
382 unregister_shrinker(&acl_shrinker);
383 #ifdef CONFIG_NFS_V4
384 unregister_filesystem(&nfs4_fs_type);
385 #endif
386 nfs_unregister_sysctl();
387 unregister_filesystem(&nfs_fs_type);
388 }
389
390 void nfs_sb_active(struct super_block *sb)
391 {
392 struct nfs_server *server = NFS_SB(sb);
393
394 if (atomic_inc_return(&server->active) == 1)
395 atomic_inc(&sb->s_active);
396 }
397
398 void nfs_sb_deactive(struct super_block *sb)
399 {
400 struct nfs_server *server = NFS_SB(sb);
401
402 if (atomic_dec_and_test(&server->active))
403 deactivate_super(sb);
404 }
405
406 /*
407 * Deliver file system statistics to userspace
408 */
409 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
410 {
411 struct nfs_server *server = NFS_SB(dentry->d_sb);
412 unsigned char blockbits;
413 unsigned long blockres;
414 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
415 struct nfs_fattr fattr;
416 struct nfs_fsstat res = {
417 .fattr = &fattr,
418 };
419 int error;
420
421 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
422 if (error < 0)
423 goto out_err;
424 buf->f_type = NFS_SUPER_MAGIC;
425
426 /*
427 * Current versions of glibc do not correctly handle the
428 * case where f_frsize != f_bsize. Eventually we want to
429 * report the value of wtmult in this field.
430 */
431 buf->f_frsize = dentry->d_sb->s_blocksize;
432
433 /*
434 * On most *nix systems, f_blocks, f_bfree, and f_bavail
435 * are reported in units of f_frsize. Linux hasn't had
436 * an f_frsize field in its statfs struct until recently,
437 * thus historically Linux's sys_statfs reports these
438 * fields in units of f_bsize.
439 */
440 buf->f_bsize = dentry->d_sb->s_blocksize;
441 blockbits = dentry->d_sb->s_blocksize_bits;
442 blockres = (1 << blockbits) - 1;
443 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
444 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
445 buf->f_bavail = (res.abytes + blockres) >> blockbits;
446
447 buf->f_files = res.tfiles;
448 buf->f_ffree = res.afiles;
449
450 buf->f_namelen = server->namelen;
451
452 return 0;
453
454 out_err:
455 dprintk("%s: statfs error = %d\n", __func__, -error);
456 return error;
457 }
458
459 /*
460 * Map the security flavour number to a name
461 */
462 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
463 {
464 static const struct {
465 rpc_authflavor_t flavour;
466 const char *str;
467 } sec_flavours[] = {
468 { RPC_AUTH_NULL, "null" },
469 { RPC_AUTH_UNIX, "sys" },
470 { RPC_AUTH_GSS_KRB5, "krb5" },
471 { RPC_AUTH_GSS_KRB5I, "krb5i" },
472 { RPC_AUTH_GSS_KRB5P, "krb5p" },
473 { RPC_AUTH_GSS_LKEY, "lkey" },
474 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
475 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
476 { RPC_AUTH_GSS_SPKM, "spkm" },
477 { RPC_AUTH_GSS_SPKMI, "spkmi" },
478 { RPC_AUTH_GSS_SPKMP, "spkmp" },
479 { UINT_MAX, "unknown" }
480 };
481 int i;
482
483 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
484 if (sec_flavours[i].flavour == flavour)
485 break;
486 }
487 return sec_flavours[i].str;
488 }
489
490 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
491 int showdefaults)
492 {
493 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
494
495 switch (sap->sa_family) {
496 case AF_INET: {
497 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
498 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
499 break;
500 }
501 case AF_INET6: {
502 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
503 seq_printf(m, ",mountaddr=%pI6", &sin6->sin6_addr);
504 break;
505 }
506 default:
507 if (showdefaults)
508 seq_printf(m, ",mountaddr=unspecified");
509 }
510
511 if (nfss->mountd_version || showdefaults)
512 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
513 if (nfss->mountd_port || showdefaults)
514 seq_printf(m, ",mountport=%u", nfss->mountd_port);
515
516 switch (nfss->mountd_protocol) {
517 case IPPROTO_UDP:
518 seq_printf(m, ",mountproto=udp");
519 break;
520 case IPPROTO_TCP:
521 seq_printf(m, ",mountproto=tcp");
522 break;
523 default:
524 if (showdefaults)
525 seq_printf(m, ",mountproto=auto");
526 }
527 }
528
529 /*
530 * Describe the mount options in force on this server representation
531 */
532 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
533 int showdefaults)
534 {
535 static const struct proc_nfs_info {
536 int flag;
537 const char *str;
538 const char *nostr;
539 } nfs_info[] = {
540 { NFS_MOUNT_SOFT, ",soft", ",hard" },
541 { NFS_MOUNT_POSIX, ",posix", "" },
542 { NFS_MOUNT_NOCTO, ",nocto", "" },
543 { NFS_MOUNT_NOAC, ",noac", "" },
544 { NFS_MOUNT_NONLM, ",nolock", "" },
545 { NFS_MOUNT_NOACL, ",noacl", "" },
546 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
547 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
548 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
549 { 0, NULL, NULL }
550 };
551 const struct proc_nfs_info *nfs_infop;
552 struct nfs_client *clp = nfss->nfs_client;
553 u32 version = clp->rpc_ops->version;
554
555 seq_printf(m, ",vers=%u", version);
556 seq_printf(m, ",rsize=%u", nfss->rsize);
557 seq_printf(m, ",wsize=%u", nfss->wsize);
558 if (nfss->bsize != 0)
559 seq_printf(m, ",bsize=%u", nfss->bsize);
560 seq_printf(m, ",namlen=%u", nfss->namelen);
561 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
562 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
563 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
564 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
565 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
566 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
567 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
568 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
569 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
570 if (nfss->flags & nfs_infop->flag)
571 seq_puts(m, nfs_infop->str);
572 else
573 seq_puts(m, nfs_infop->nostr);
574 }
575 seq_printf(m, ",proto=%s",
576 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
577 if (version == 4) {
578 if (nfss->port != NFS_PORT)
579 seq_printf(m, ",port=%u", nfss->port);
580 } else
581 if (nfss->port)
582 seq_printf(m, ",port=%u", nfss->port);
583
584 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
585 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
586 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
587
588 if (version != 4)
589 nfs_show_mountd_options(m, nfss, showdefaults);
590
591 #ifdef CONFIG_NFS_V4
592 if (clp->rpc_ops->version == 4)
593 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
594 #endif
595 if (nfss->options & NFS_OPTION_FSCACHE)
596 seq_printf(m, ",fsc");
597 }
598
599 /*
600 * Describe the mount options on this VFS mountpoint
601 */
602 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
603 {
604 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
605
606 nfs_show_mount_options(m, nfss, 0);
607
608 seq_printf(m, ",addr=%s",
609 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
610 RPC_DISPLAY_ADDR));
611
612 return 0;
613 }
614
615 /*
616 * Present statistical information for this VFS mountpoint
617 */
618 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
619 {
620 int i, cpu;
621 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
622 struct rpc_auth *auth = nfss->client->cl_auth;
623 struct nfs_iostats totals = { };
624
625 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
626
627 /*
628 * Display all mount option settings
629 */
630 seq_printf(m, "\n\topts:\t");
631 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
632 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
633 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
634 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
635 nfs_show_mount_options(m, nfss, 1);
636
637 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
638
639 seq_printf(m, "\n\tcaps:\t");
640 seq_printf(m, "caps=0x%x", nfss->caps);
641 seq_printf(m, ",wtmult=%u", nfss->wtmult);
642 seq_printf(m, ",dtsize=%u", nfss->dtsize);
643 seq_printf(m, ",bsize=%u", nfss->bsize);
644 seq_printf(m, ",namlen=%u", nfss->namelen);
645
646 #ifdef CONFIG_NFS_V4
647 if (nfss->nfs_client->rpc_ops->version == 4) {
648 seq_printf(m, "\n\tnfsv4:\t");
649 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
650 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
651 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
652 }
653 #endif
654
655 /*
656 * Display security flavor in effect for this mount
657 */
658 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
659 if (auth->au_flavor)
660 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
661
662 /*
663 * Display superblock I/O counters
664 */
665 for_each_possible_cpu(cpu) {
666 struct nfs_iostats *stats;
667
668 preempt_disable();
669 stats = per_cpu_ptr(nfss->io_stats, cpu);
670
671 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
672 totals.events[i] += stats->events[i];
673 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
674 totals.bytes[i] += stats->bytes[i];
675 #ifdef CONFIG_NFS_FSCACHE
676 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
677 totals.fscache[i] += stats->fscache[i];
678 #endif
679
680 preempt_enable();
681 }
682
683 seq_printf(m, "\n\tevents:\t");
684 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
685 seq_printf(m, "%lu ", totals.events[i]);
686 seq_printf(m, "\n\tbytes:\t");
687 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
688 seq_printf(m, "%Lu ", totals.bytes[i]);
689 #ifdef CONFIG_NFS_FSCACHE
690 if (nfss->options & NFS_OPTION_FSCACHE) {
691 seq_printf(m, "\n\tfsc:\t");
692 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
693 seq_printf(m, "%Lu ", totals.bytes[i]);
694 }
695 #endif
696 seq_printf(m, "\n");
697
698 rpc_print_iostats(m, nfss->client);
699
700 return 0;
701 }
702
703 /*
704 * Begin unmount by attempting to remove all automounted mountpoints we added
705 * in response to xdev traversals and referrals
706 */
707 static void nfs_umount_begin(struct super_block *sb)
708 {
709 struct nfs_server *server;
710 struct rpc_clnt *rpc;
711
712 lock_kernel();
713
714 server = NFS_SB(sb);
715 /* -EIO all pending I/O */
716 rpc = server->client_acl;
717 if (!IS_ERR(rpc))
718 rpc_killall_tasks(rpc);
719 rpc = server->client;
720 if (!IS_ERR(rpc))
721 rpc_killall_tasks(rpc);
722
723 unlock_kernel();
724 }
725
726 /*
727 * Sanity-check a server address provided by the mount command.
728 *
729 * Address family must be initialized, and address must not be
730 * the ANY address for that family.
731 */
732 static int nfs_verify_server_address(struct sockaddr *addr)
733 {
734 switch (addr->sa_family) {
735 case AF_INET: {
736 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
737 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
738 }
739 case AF_INET6: {
740 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
741 return !ipv6_addr_any(sa);
742 }
743 }
744
745 return 0;
746 }
747
748 static void nfs_parse_ipv4_address(char *string, size_t str_len,
749 struct sockaddr *sap, size_t *addr_len)
750 {
751 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
752 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
753
754 if (str_len <= INET_ADDRSTRLEN) {
755 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
756 (int)str_len, string);
757
758 sin->sin_family = AF_INET;
759 *addr_len = sizeof(*sin);
760 if (in4_pton(string, str_len, addr, '\0', NULL))
761 return;
762 }
763
764 sap->sa_family = AF_UNSPEC;
765 *addr_len = 0;
766 }
767
768 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
769 static int nfs_parse_ipv6_scope_id(const char *string, const size_t str_len,
770 const char *delim,
771 struct sockaddr_in6 *sin6)
772 {
773 char *p;
774 size_t len;
775
776 if ((string + str_len) == delim)
777 return 1;
778
779 if (*delim != IPV6_SCOPE_DELIMITER)
780 return 0;
781
782 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
783 return 0;
784
785 len = (string + str_len) - delim - 1;
786 p = kstrndup(delim + 1, len, GFP_KERNEL);
787 if (p) {
788 unsigned long scope_id = 0;
789 struct net_device *dev;
790
791 dev = dev_get_by_name(&init_net, p);
792 if (dev != NULL) {
793 scope_id = dev->ifindex;
794 dev_put(dev);
795 } else {
796 if (strict_strtoul(p, 10, &scope_id) == 0) {
797 kfree(p);
798 return 0;
799 }
800 }
801
802 kfree(p);
803
804 sin6->sin6_scope_id = scope_id;
805 dfprintk(MOUNT, "NFS: IPv6 scope ID = %lu\n", scope_id);
806 return 1;
807 }
808
809 return 0;
810 }
811
812 static void nfs_parse_ipv6_address(char *string, size_t str_len,
813 struct sockaddr *sap, size_t *addr_len)
814 {
815 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
816 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
817 const char *delim;
818
819 if (str_len <= INET6_ADDRSTRLEN) {
820 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
821 (int)str_len, string);
822
823 sin6->sin6_family = AF_INET6;
824 *addr_len = sizeof(*sin6);
825 if (in6_pton(string, str_len, addr,
826 IPV6_SCOPE_DELIMITER, &delim) != 0) {
827 if (nfs_parse_ipv6_scope_id(string, str_len,
828 delim, sin6) != 0)
829 return;
830 }
831 }
832
833 sap->sa_family = AF_UNSPEC;
834 *addr_len = 0;
835 }
836 #else
837 static void nfs_parse_ipv6_address(char *string, size_t str_len,
838 struct sockaddr *sap, size_t *addr_len)
839 {
840 sap->sa_family = AF_UNSPEC;
841 *addr_len = 0;
842 }
843 #endif
844
845 /*
846 * Construct a sockaddr based on the contents of a string that contains
847 * an IP address in presentation format.
848 *
849 * If there is a problem constructing the new sockaddr, set the address
850 * family to AF_UNSPEC.
851 */
852 void nfs_parse_ip_address(char *string, size_t str_len,
853 struct sockaddr *sap, size_t *addr_len)
854 {
855 unsigned int i, colons;
856
857 colons = 0;
858 for (i = 0; i < str_len; i++)
859 if (string[i] == ':')
860 colons++;
861
862 if (colons >= 2)
863 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
864 else
865 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
866 }
867
868 /*
869 * Sanity check the NFS transport protocol.
870 *
871 */
872 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
873 {
874 switch (mnt->nfs_server.protocol) {
875 case XPRT_TRANSPORT_UDP:
876 case XPRT_TRANSPORT_TCP:
877 case XPRT_TRANSPORT_RDMA:
878 break;
879 default:
880 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
881 }
882 }
883
884 /*
885 * For text based NFSv2/v3 mounts, the mount protocol transport default
886 * settings should depend upon the specified NFS transport.
887 */
888 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
889 {
890 nfs_validate_transport_protocol(mnt);
891
892 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
893 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
894 return;
895 switch (mnt->nfs_server.protocol) {
896 case XPRT_TRANSPORT_UDP:
897 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
898 break;
899 case XPRT_TRANSPORT_TCP:
900 case XPRT_TRANSPORT_RDMA:
901 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
902 }
903 }
904
905 /*
906 * Parse the value of the 'sec=' option.
907 *
908 * The flavor_len setting is for v4 mounts.
909 */
910 static int nfs_parse_security_flavors(char *value,
911 struct nfs_parsed_mount_data *mnt)
912 {
913 substring_t args[MAX_OPT_ARGS];
914
915 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
916
917 switch (match_token(value, nfs_secflavor_tokens, args)) {
918 case Opt_sec_none:
919 mnt->auth_flavor_len = 0;
920 mnt->auth_flavors[0] = RPC_AUTH_NULL;
921 break;
922 case Opt_sec_sys:
923 mnt->auth_flavor_len = 0;
924 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
925 break;
926 case Opt_sec_krb5:
927 mnt->auth_flavor_len = 1;
928 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
929 break;
930 case Opt_sec_krb5i:
931 mnt->auth_flavor_len = 1;
932 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
933 break;
934 case Opt_sec_krb5p:
935 mnt->auth_flavor_len = 1;
936 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
937 break;
938 case Opt_sec_lkey:
939 mnt->auth_flavor_len = 1;
940 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
941 break;
942 case Opt_sec_lkeyi:
943 mnt->auth_flavor_len = 1;
944 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
945 break;
946 case Opt_sec_lkeyp:
947 mnt->auth_flavor_len = 1;
948 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
949 break;
950 case Opt_sec_spkm:
951 mnt->auth_flavor_len = 1;
952 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
953 break;
954 case Opt_sec_spkmi:
955 mnt->auth_flavor_len = 1;
956 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
957 break;
958 case Opt_sec_spkmp:
959 mnt->auth_flavor_len = 1;
960 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
961 break;
962 default:
963 return 0;
964 }
965
966 return 1;
967 }
968
969 /*
970 * Error-check and convert a string of mount options from user space into
971 * a data structure. The whole mount string is processed; bad options are
972 * skipped as they are encountered. If there were no errors, return 1;
973 * otherwise return 0 (zero).
974 */
975 static int nfs_parse_mount_options(char *raw,
976 struct nfs_parsed_mount_data *mnt)
977 {
978 char *p, *string, *secdata;
979 int rc, sloppy = 0, invalid_option = 0;
980
981 if (!raw) {
982 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
983 return 1;
984 }
985 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
986
987 secdata = alloc_secdata();
988 if (!secdata)
989 goto out_nomem;
990
991 rc = security_sb_copy_data(raw, secdata);
992 if (rc)
993 goto out_security_failure;
994
995 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
996 if (rc)
997 goto out_security_failure;
998
999 free_secdata(secdata);
1000
1001 while ((p = strsep(&raw, ",")) != NULL) {
1002 substring_t args[MAX_OPT_ARGS];
1003 unsigned long option;
1004 int int_option;
1005 int token;
1006
1007 if (!*p)
1008 continue;
1009
1010 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1011
1012 token = match_token(p, nfs_mount_option_tokens, args);
1013 switch (token) {
1014
1015 /*
1016 * boolean options: foo/nofoo
1017 */
1018 case Opt_soft:
1019 mnt->flags |= NFS_MOUNT_SOFT;
1020 break;
1021 case Opt_hard:
1022 mnt->flags &= ~NFS_MOUNT_SOFT;
1023 break;
1024 case Opt_posix:
1025 mnt->flags |= NFS_MOUNT_POSIX;
1026 break;
1027 case Opt_noposix:
1028 mnt->flags &= ~NFS_MOUNT_POSIX;
1029 break;
1030 case Opt_cto:
1031 mnt->flags &= ~NFS_MOUNT_NOCTO;
1032 break;
1033 case Opt_nocto:
1034 mnt->flags |= NFS_MOUNT_NOCTO;
1035 break;
1036 case Opt_ac:
1037 mnt->flags &= ~NFS_MOUNT_NOAC;
1038 break;
1039 case Opt_noac:
1040 mnt->flags |= NFS_MOUNT_NOAC;
1041 break;
1042 case Opt_lock:
1043 mnt->flags &= ~NFS_MOUNT_NONLM;
1044 break;
1045 case Opt_nolock:
1046 mnt->flags |= NFS_MOUNT_NONLM;
1047 break;
1048 case Opt_v2:
1049 mnt->flags &= ~NFS_MOUNT_VER3;
1050 break;
1051 case Opt_v3:
1052 mnt->flags |= NFS_MOUNT_VER3;
1053 break;
1054 case Opt_udp:
1055 mnt->flags &= ~NFS_MOUNT_TCP;
1056 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1057 break;
1058 case Opt_tcp:
1059 mnt->flags |= NFS_MOUNT_TCP;
1060 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1061 break;
1062 case Opt_rdma:
1063 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1064 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1065 xprt_load_transport(p);
1066 break;
1067 case Opt_acl:
1068 mnt->flags &= ~NFS_MOUNT_NOACL;
1069 break;
1070 case Opt_noacl:
1071 mnt->flags |= NFS_MOUNT_NOACL;
1072 break;
1073 case Opt_rdirplus:
1074 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1075 break;
1076 case Opt_nordirplus:
1077 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1078 break;
1079 case Opt_sharecache:
1080 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1081 break;
1082 case Opt_nosharecache:
1083 mnt->flags |= NFS_MOUNT_UNSHARED;
1084 break;
1085 case Opt_resvport:
1086 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1087 break;
1088 case Opt_noresvport:
1089 mnt->flags |= NFS_MOUNT_NORESVPORT;
1090 break;
1091 case Opt_fscache:
1092 mnt->options |= NFS_OPTION_FSCACHE;
1093 kfree(mnt->fscache_uniq);
1094 mnt->fscache_uniq = NULL;
1095 break;
1096 case Opt_nofscache:
1097 mnt->options &= ~NFS_OPTION_FSCACHE;
1098 kfree(mnt->fscache_uniq);
1099 mnt->fscache_uniq = NULL;
1100 break;
1101 case Opt_fscache_uniq:
1102 string = match_strdup(args);
1103 if (!string)
1104 goto out_nomem;
1105 kfree(mnt->fscache_uniq);
1106 mnt->fscache_uniq = string;
1107 mnt->options |= NFS_OPTION_FSCACHE;
1108 break;
1109
1110 /*
1111 * options that take numeric values
1112 */
1113 case Opt_port:
1114 string = match_strdup(args);
1115 if (string == NULL)
1116 goto out_nomem;
1117 rc = strict_strtoul(string, 10, &option);
1118 kfree(string);
1119 if (rc != 0 || option > USHORT_MAX)
1120 goto out_invalid_value;
1121 mnt->nfs_server.port = option;
1122 break;
1123 case Opt_rsize:
1124 string = match_strdup(args);
1125 if (string == NULL)
1126 goto out_nomem;
1127 rc = strict_strtoul(string, 10, &option);
1128 kfree(string);
1129 if (rc != 0)
1130 goto out_invalid_value;
1131 mnt->rsize = option;
1132 break;
1133 case Opt_wsize:
1134 string = match_strdup(args);
1135 if (string == NULL)
1136 goto out_nomem;
1137 rc = strict_strtoul(string, 10, &option);
1138 kfree(string);
1139 if (rc != 0)
1140 goto out_invalid_value;
1141 mnt->wsize = option;
1142 break;
1143 case Opt_bsize:
1144 string = match_strdup(args);
1145 if (string == NULL)
1146 goto out_nomem;
1147 rc = strict_strtoul(string, 10, &option);
1148 kfree(string);
1149 if (rc != 0)
1150 goto out_invalid_value;
1151 mnt->bsize = option;
1152 break;
1153 case Opt_timeo:
1154 string = match_strdup(args);
1155 if (string == NULL)
1156 goto out_nomem;
1157 rc = strict_strtoul(string, 10, &option);
1158 kfree(string);
1159 if (rc != 0 || option == 0)
1160 goto out_invalid_value;
1161 mnt->timeo = option;
1162 break;
1163 case Opt_retrans:
1164 string = match_strdup(args);
1165 if (string == NULL)
1166 goto out_nomem;
1167 rc = strict_strtoul(string, 10, &option);
1168 kfree(string);
1169 if (rc != 0 || option == 0)
1170 goto out_invalid_value;
1171 mnt->retrans = option;
1172 break;
1173 case Opt_acregmin:
1174 string = match_strdup(args);
1175 if (string == NULL)
1176 goto out_nomem;
1177 rc = strict_strtoul(string, 10, &option);
1178 kfree(string);
1179 if (rc != 0)
1180 goto out_invalid_value;
1181 mnt->acregmin = option;
1182 break;
1183 case Opt_acregmax:
1184 string = match_strdup(args);
1185 if (string == NULL)
1186 goto out_nomem;
1187 rc = strict_strtoul(string, 10, &option);
1188 kfree(string);
1189 if (rc != 0)
1190 goto out_invalid_value;
1191 mnt->acregmax = option;
1192 break;
1193 case Opt_acdirmin:
1194 string = match_strdup(args);
1195 if (string == NULL)
1196 goto out_nomem;
1197 rc = strict_strtoul(string, 10, &option);
1198 kfree(string);
1199 if (rc != 0)
1200 goto out_invalid_value;
1201 mnt->acdirmin = option;
1202 break;
1203 case Opt_acdirmax:
1204 string = match_strdup(args);
1205 if (string == NULL)
1206 goto out_nomem;
1207 rc = strict_strtoul(string, 10, &option);
1208 kfree(string);
1209 if (rc != 0)
1210 goto out_invalid_value;
1211 mnt->acdirmax = option;
1212 break;
1213 case Opt_actimeo:
1214 string = match_strdup(args);
1215 if (string == NULL)
1216 goto out_nomem;
1217 rc = strict_strtoul(string, 10, &option);
1218 kfree(string);
1219 if (rc != 0)
1220 goto out_invalid_value;
1221 mnt->acregmin = mnt->acregmax =
1222 mnt->acdirmin = mnt->acdirmax = option;
1223 break;
1224 case Opt_namelen:
1225 string = match_strdup(args);
1226 if (string == NULL)
1227 goto out_nomem;
1228 rc = strict_strtoul(string, 10, &option);
1229 kfree(string);
1230 if (rc != 0)
1231 goto out_invalid_value;
1232 mnt->namlen = option;
1233 break;
1234 case Opt_mountport:
1235 string = match_strdup(args);
1236 if (string == NULL)
1237 goto out_nomem;
1238 rc = strict_strtoul(string, 10, &option);
1239 kfree(string);
1240 if (rc != 0 || option > USHORT_MAX)
1241 goto out_invalid_value;
1242 mnt->mount_server.port = option;
1243 break;
1244 case Opt_mountvers:
1245 string = match_strdup(args);
1246 if (string == NULL)
1247 goto out_nomem;
1248 rc = strict_strtoul(string, 10, &option);
1249 kfree(string);
1250 if (rc != 0 ||
1251 option < NFS_MNT_VERSION ||
1252 option > NFS_MNT3_VERSION)
1253 goto out_invalid_value;
1254 mnt->mount_server.version = option;
1255 break;
1256 case Opt_nfsvers:
1257 string = match_strdup(args);
1258 if (string == NULL)
1259 goto out_nomem;
1260 rc = strict_strtoul(string, 10, &option);
1261 kfree(string);
1262 if (rc != 0)
1263 goto out_invalid_value;
1264 switch (option) {
1265 case NFS2_VERSION:
1266 mnt->flags &= ~NFS_MOUNT_VER3;
1267 break;
1268 case NFS3_VERSION:
1269 mnt->flags |= NFS_MOUNT_VER3;
1270 break;
1271 default:
1272 goto out_invalid_value;
1273 }
1274 break;
1275 case Opt_minorversion:
1276 if (match_int(args, &int_option))
1277 return 0;
1278 if (int_option < 0 || int_option > NFS4_MAX_MINOR_VERSION)
1279 return 0;
1280 mnt->minorversion = int_option;
1281 break;
1282
1283 /*
1284 * options that take text values
1285 */
1286 case Opt_sec:
1287 string = match_strdup(args);
1288 if (string == NULL)
1289 goto out_nomem;
1290 rc = nfs_parse_security_flavors(string, mnt);
1291 kfree(string);
1292 if (!rc) {
1293 dfprintk(MOUNT, "NFS: unrecognized "
1294 "security flavor\n");
1295 return 0;
1296 }
1297 break;
1298 case Opt_proto:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
1302 token = match_token(string,
1303 nfs_xprt_protocol_tokens, args);
1304
1305 switch (token) {
1306 case Opt_xprt_udp:
1307 mnt->flags &= ~NFS_MOUNT_TCP;
1308 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1309 kfree(string);
1310 break;
1311 case Opt_xprt_tcp:
1312 mnt->flags |= NFS_MOUNT_TCP;
1313 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1314 kfree(string);
1315 break;
1316 case Opt_xprt_rdma:
1317 /* vector side protocols to TCP */
1318 mnt->flags |= NFS_MOUNT_TCP;
1319 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1320 xprt_load_transport(string);
1321 kfree(string);
1322 break;
1323 default:
1324 dfprintk(MOUNT, "NFS: unrecognized "
1325 "transport protocol\n");
1326 return 0;
1327 }
1328 break;
1329 case Opt_mountproto:
1330 string = match_strdup(args);
1331 if (string == NULL)
1332 goto out_nomem;
1333 token = match_token(string,
1334 nfs_xprt_protocol_tokens, args);
1335 kfree(string);
1336
1337 switch (token) {
1338 case Opt_xprt_udp:
1339 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1340 break;
1341 case Opt_xprt_tcp:
1342 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1343 break;
1344 case Opt_xprt_rdma: /* not used for side protocols */
1345 default:
1346 dfprintk(MOUNT, "NFS: unrecognized "
1347 "transport protocol\n");
1348 return 0;
1349 }
1350 break;
1351 case Opt_addr:
1352 string = match_strdup(args);
1353 if (string == NULL)
1354 goto out_nomem;
1355 nfs_parse_ip_address(string, strlen(string),
1356 (struct sockaddr *)
1357 &mnt->nfs_server.address,
1358 &mnt->nfs_server.addrlen);
1359 kfree(string);
1360 break;
1361 case Opt_clientaddr:
1362 string = match_strdup(args);
1363 if (string == NULL)
1364 goto out_nomem;
1365 kfree(mnt->client_address);
1366 mnt->client_address = string;
1367 break;
1368 case Opt_mounthost:
1369 string = match_strdup(args);
1370 if (string == NULL)
1371 goto out_nomem;
1372 kfree(mnt->mount_server.hostname);
1373 mnt->mount_server.hostname = string;
1374 break;
1375 case Opt_mountaddr:
1376 string = match_strdup(args);
1377 if (string == NULL)
1378 goto out_nomem;
1379 nfs_parse_ip_address(string, strlen(string),
1380 (struct sockaddr *)
1381 &mnt->mount_server.address,
1382 &mnt->mount_server.addrlen);
1383 kfree(string);
1384 break;
1385 case Opt_lookupcache:
1386 string = match_strdup(args);
1387 if (string == NULL)
1388 goto out_nomem;
1389 token = match_token(string,
1390 nfs_lookupcache_tokens, args);
1391 kfree(string);
1392 switch (token) {
1393 case Opt_lookupcache_all:
1394 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1395 break;
1396 case Opt_lookupcache_positive:
1397 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1398 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1399 break;
1400 case Opt_lookupcache_none:
1401 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1402 break;
1403 default:
1404 dfprintk(MOUNT, "NFS: invalid "
1405 "lookupcache argument\n");
1406 return 0;
1407 };
1408 break;
1409
1410 /*
1411 * Special options
1412 */
1413 case Opt_sloppy:
1414 sloppy = 1;
1415 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1416 break;
1417 case Opt_userspace:
1418 case Opt_deprecated:
1419 dfprintk(MOUNT, "NFS: ignoring mount option "
1420 "'%s'\n", p);
1421 break;
1422
1423 default:
1424 invalid_option = 1;
1425 dfprintk(MOUNT, "NFS: unrecognized mount option "
1426 "'%s'\n", p);
1427 }
1428 }
1429
1430 if (!sloppy && invalid_option)
1431 return 0;
1432
1433 return 1;
1434
1435 out_invalid_value:
1436 printk(KERN_INFO "NFS: bad mount option value specified: %s \n", p);
1437 return 0;
1438 out_nomem:
1439 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1440 return 0;
1441 out_security_failure:
1442 free_secdata(secdata);
1443 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1444 return 0;
1445 }
1446
1447 /*
1448 * Use the remote server's MOUNT service to request the NFS file handle
1449 * corresponding to the provided path.
1450 */
1451 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1452 struct nfs_fh *root_fh)
1453 {
1454 unsigned int auth_flavor_len = 0;
1455 struct nfs_mount_request request = {
1456 .sap = (struct sockaddr *)
1457 &args->mount_server.address,
1458 .dirpath = args->nfs_server.export_path,
1459 .protocol = args->mount_server.protocol,
1460 .fh = root_fh,
1461 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1462 .auth_flav_len = &auth_flavor_len,
1463 };
1464 int status;
1465
1466 if (args->mount_server.version == 0) {
1467 if (args->flags & NFS_MOUNT_VER3)
1468 args->mount_server.version = NFS_MNT3_VERSION;
1469 else
1470 args->mount_server.version = NFS_MNT_VERSION;
1471 }
1472 request.version = args->mount_server.version;
1473
1474 if (args->mount_server.hostname)
1475 request.hostname = args->mount_server.hostname;
1476 else
1477 request.hostname = args->nfs_server.hostname;
1478
1479 /*
1480 * Construct the mount server's address.
1481 */
1482 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1483 memcpy(request.sap, &args->nfs_server.address,
1484 args->nfs_server.addrlen);
1485 args->mount_server.addrlen = args->nfs_server.addrlen;
1486 }
1487 request.salen = args->mount_server.addrlen;
1488
1489 /*
1490 * autobind will be used if mount_server.port == 0
1491 */
1492 nfs_set_port(request.sap, args->mount_server.port);
1493
1494 /*
1495 * Now ask the mount server to map our export path
1496 * to a file handle.
1497 */
1498 status = nfs_mount(&request);
1499 if (status == 0)
1500 return 0;
1501
1502 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1503 request.hostname, status);
1504 return status;
1505 }
1506
1507 static int nfs_parse_simple_hostname(const char *dev_name,
1508 char **hostname, size_t maxnamlen,
1509 char **export_path, size_t maxpathlen)
1510 {
1511 size_t len;
1512 char *colon, *comma;
1513
1514 colon = strchr(dev_name, ':');
1515 if (colon == NULL)
1516 goto out_bad_devname;
1517
1518 len = colon - dev_name;
1519 if (len > maxnamlen)
1520 goto out_hostname;
1521
1522 /* N.B. caller will free nfs_server.hostname in all cases */
1523 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1524 if (!*hostname)
1525 goto out_nomem;
1526
1527 /* kill possible hostname list: not supported */
1528 comma = strchr(*hostname, ',');
1529 if (comma != NULL) {
1530 if (comma == *hostname)
1531 goto out_bad_devname;
1532 *comma = '\0';
1533 }
1534
1535 colon++;
1536 len = strlen(colon);
1537 if (len > maxpathlen)
1538 goto out_path;
1539 *export_path = kstrndup(colon, len, GFP_KERNEL);
1540 if (!*export_path)
1541 goto out_nomem;
1542
1543 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1544 return 0;
1545
1546 out_bad_devname:
1547 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1548 return -EINVAL;
1549
1550 out_nomem:
1551 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1552 return -ENOMEM;
1553
1554 out_hostname:
1555 dfprintk(MOUNT, "NFS: server hostname too long\n");
1556 return -ENAMETOOLONG;
1557
1558 out_path:
1559 dfprintk(MOUNT, "NFS: export pathname too long\n");
1560 return -ENAMETOOLONG;
1561 }
1562
1563 /*
1564 * Hostname has square brackets around it because it contains one or
1565 * more colons. We look for the first closing square bracket, and a
1566 * colon must follow it.
1567 */
1568 static int nfs_parse_protected_hostname(const char *dev_name,
1569 char **hostname, size_t maxnamlen,
1570 char **export_path, size_t maxpathlen)
1571 {
1572 size_t len;
1573 char *start, *end;
1574
1575 start = (char *)(dev_name + 1);
1576
1577 end = strchr(start, ']');
1578 if (end == NULL)
1579 goto out_bad_devname;
1580 if (*(end + 1) != ':')
1581 goto out_bad_devname;
1582
1583 len = end - start;
1584 if (len > maxnamlen)
1585 goto out_hostname;
1586
1587 /* N.B. caller will free nfs_server.hostname in all cases */
1588 *hostname = kstrndup(start, len, GFP_KERNEL);
1589 if (*hostname == NULL)
1590 goto out_nomem;
1591
1592 end += 2;
1593 len = strlen(end);
1594 if (len > maxpathlen)
1595 goto out_path;
1596 *export_path = kstrndup(end, len, GFP_KERNEL);
1597 if (!*export_path)
1598 goto out_nomem;
1599
1600 return 0;
1601
1602 out_bad_devname:
1603 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1604 return -EINVAL;
1605
1606 out_nomem:
1607 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1608 return -ENOMEM;
1609
1610 out_hostname:
1611 dfprintk(MOUNT, "NFS: server hostname too long\n");
1612 return -ENAMETOOLONG;
1613
1614 out_path:
1615 dfprintk(MOUNT, "NFS: export pathname too long\n");
1616 return -ENAMETOOLONG;
1617 }
1618
1619 /*
1620 * Split "dev_name" into "hostname:export_path".
1621 *
1622 * The leftmost colon demarks the split between the server's hostname
1623 * and the export path. If the hostname starts with a left square
1624 * bracket, then it may contain colons.
1625 *
1626 * Note: caller frees hostname and export path, even on error.
1627 */
1628 static int nfs_parse_devname(const char *dev_name,
1629 char **hostname, size_t maxnamlen,
1630 char **export_path, size_t maxpathlen)
1631 {
1632 if (*dev_name == '[')
1633 return nfs_parse_protected_hostname(dev_name,
1634 hostname, maxnamlen,
1635 export_path, maxpathlen);
1636
1637 return nfs_parse_simple_hostname(dev_name,
1638 hostname, maxnamlen,
1639 export_path, maxpathlen);
1640 }
1641
1642 /*
1643 * Validate the NFS2/NFS3 mount data
1644 * - fills in the mount root filehandle
1645 *
1646 * For option strings, user space handles the following behaviors:
1647 *
1648 * + DNS: mapping server host name to IP address ("addr=" option)
1649 *
1650 * + failure mode: how to behave if a mount request can't be handled
1651 * immediately ("fg/bg" option)
1652 *
1653 * + retry: how often to retry a mount request ("retry=" option)
1654 *
1655 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1656 * mountproto=tcp after mountproto=udp, and so on
1657 */
1658 static int nfs_validate_mount_data(void *options,
1659 struct nfs_parsed_mount_data *args,
1660 struct nfs_fh *mntfh,
1661 const char *dev_name)
1662 {
1663 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1664
1665 if (data == NULL)
1666 goto out_no_data;
1667
1668 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1669 args->rsize = NFS_MAX_FILE_IO_SIZE;
1670 args->wsize = NFS_MAX_FILE_IO_SIZE;
1671 args->acregmin = NFS_DEF_ACREGMIN;
1672 args->acregmax = NFS_DEF_ACREGMAX;
1673 args->acdirmin = NFS_DEF_ACDIRMIN;
1674 args->acdirmax = NFS_DEF_ACDIRMAX;
1675 args->mount_server.port = 0; /* autobind unless user sets port */
1676 args->nfs_server.port = 0; /* autobind unless user sets port */
1677 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1678 args->auth_flavors[0] = RPC_AUTH_UNIX;
1679
1680 switch (data->version) {
1681 case 1:
1682 data->namlen = 0;
1683 case 2:
1684 data->bsize = 0;
1685 case 3:
1686 if (data->flags & NFS_MOUNT_VER3)
1687 goto out_no_v3;
1688 data->root.size = NFS2_FHSIZE;
1689 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1690 case 4:
1691 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1692 goto out_no_sec;
1693 case 5:
1694 memset(data->context, 0, sizeof(data->context));
1695 case 6:
1696 if (data->flags & NFS_MOUNT_VER3) {
1697 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1698 goto out_invalid_fh;
1699 mntfh->size = data->root.size;
1700 } else
1701 mntfh->size = NFS2_FHSIZE;
1702
1703
1704 memcpy(mntfh->data, data->root.data, mntfh->size);
1705 if (mntfh->size < sizeof(mntfh->data))
1706 memset(mntfh->data + mntfh->size, 0,
1707 sizeof(mntfh->data) - mntfh->size);
1708
1709 /*
1710 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1711 * can deal with.
1712 */
1713 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1714 args->rsize = data->rsize;
1715 args->wsize = data->wsize;
1716 args->timeo = data->timeo;
1717 args->retrans = data->retrans;
1718 args->acregmin = data->acregmin;
1719 args->acregmax = data->acregmax;
1720 args->acdirmin = data->acdirmin;
1721 args->acdirmax = data->acdirmax;
1722
1723 memcpy(&args->nfs_server.address, &data->addr,
1724 sizeof(data->addr));
1725 args->nfs_server.addrlen = sizeof(data->addr);
1726 if (!nfs_verify_server_address((struct sockaddr *)
1727 &args->nfs_server.address))
1728 goto out_no_address;
1729
1730 if (!(data->flags & NFS_MOUNT_TCP))
1731 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1732 /* N.B. caller will free nfs_server.hostname in all cases */
1733 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1734 args->namlen = data->namlen;
1735 args->bsize = data->bsize;
1736
1737 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1738 args->auth_flavors[0] = data->pseudoflavor;
1739 if (!args->nfs_server.hostname)
1740 goto out_nomem;
1741
1742 /*
1743 * The legacy version 6 binary mount data from userspace has a
1744 * field used only to transport selinux information into the
1745 * the kernel. To continue to support that functionality we
1746 * have a touch of selinux knowledge here in the NFS code. The
1747 * userspace code converted context=blah to just blah so we are
1748 * converting back to the full string selinux understands.
1749 */
1750 if (data->context[0]){
1751 #ifdef CONFIG_SECURITY_SELINUX
1752 int rc;
1753 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1754 if (!opts_str)
1755 return -ENOMEM;
1756 strcpy(opts_str, "context=");
1757 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1758 strcat(opts_str, &data->context[0]);
1759 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1760 kfree(opts_str);
1761 if (rc)
1762 return rc;
1763 #else
1764 return -EINVAL;
1765 #endif
1766 }
1767
1768 break;
1769 default: {
1770 int status;
1771
1772 if (nfs_parse_mount_options((char *)options, args) == 0)
1773 return -EINVAL;
1774
1775 if (!nfs_verify_server_address((struct sockaddr *)
1776 &args->nfs_server.address))
1777 goto out_no_address;
1778
1779 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
1780 args->nfs_server.port);
1781
1782 nfs_set_mount_transport_protocol(args);
1783
1784 status = nfs_parse_devname(dev_name,
1785 &args->nfs_server.hostname,
1786 PAGE_SIZE,
1787 &args->nfs_server.export_path,
1788 NFS_MAXPATHLEN);
1789 if (!status)
1790 status = nfs_try_mount(args, mntfh);
1791
1792 kfree(args->nfs_server.export_path);
1793 args->nfs_server.export_path = NULL;
1794
1795 if (status)
1796 return status;
1797
1798 break;
1799 }
1800 }
1801
1802 #ifndef CONFIG_NFS_V3
1803 if (args->flags & NFS_MOUNT_VER3)
1804 goto out_v3_not_compiled;
1805 #endif /* !CONFIG_NFS_V3 */
1806
1807 return 0;
1808
1809 out_no_data:
1810 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1811 return -EINVAL;
1812
1813 out_no_v3:
1814 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1815 data->version);
1816 return -EINVAL;
1817
1818 out_no_sec:
1819 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1820 return -EINVAL;
1821
1822 #ifndef CONFIG_NFS_V3
1823 out_v3_not_compiled:
1824 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1825 return -EPROTONOSUPPORT;
1826 #endif /* !CONFIG_NFS_V3 */
1827
1828 out_nomem:
1829 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1830 return -ENOMEM;
1831
1832 out_no_address:
1833 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1834 return -EINVAL;
1835
1836 out_invalid_fh:
1837 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1838 return -EINVAL;
1839 }
1840
1841 static int
1842 nfs_compare_remount_data(struct nfs_server *nfss,
1843 struct nfs_parsed_mount_data *data)
1844 {
1845 if (data->flags != nfss->flags ||
1846 data->rsize != nfss->rsize ||
1847 data->wsize != nfss->wsize ||
1848 data->retrans != nfss->client->cl_timeout->to_retries ||
1849 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1850 data->acregmin != nfss->acregmin / HZ ||
1851 data->acregmax != nfss->acregmax / HZ ||
1852 data->acdirmin != nfss->acdirmin / HZ ||
1853 data->acdirmax != nfss->acdirmax / HZ ||
1854 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1855 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1856 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1857 data->nfs_server.addrlen) != 0)
1858 return -EINVAL;
1859
1860 return 0;
1861 }
1862
1863 static int
1864 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1865 {
1866 int error;
1867 struct nfs_server *nfss = sb->s_fs_info;
1868 struct nfs_parsed_mount_data *data;
1869 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1870 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1871 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1872
1873 /*
1874 * Userspace mount programs that send binary options generally send
1875 * them populated with default values. We have no way to know which
1876 * ones were explicitly specified. Fall back to legacy behavior and
1877 * just return success.
1878 */
1879 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1880 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1881 options->version <= 6))))
1882 return 0;
1883
1884 data = kzalloc(sizeof(*data), GFP_KERNEL);
1885 if (data == NULL)
1886 return -ENOMEM;
1887
1888 lock_kernel();
1889 /* fill out struct with values from existing mount */
1890 data->flags = nfss->flags;
1891 data->rsize = nfss->rsize;
1892 data->wsize = nfss->wsize;
1893 data->retrans = nfss->client->cl_timeout->to_retries;
1894 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1895 data->acregmin = nfss->acregmin / HZ;
1896 data->acregmax = nfss->acregmax / HZ;
1897 data->acdirmin = nfss->acdirmin / HZ;
1898 data->acdirmax = nfss->acdirmax / HZ;
1899 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1900 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1901 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1902 data->nfs_server.addrlen);
1903
1904 /* overwrite those values with any that were specified */
1905 error = nfs_parse_mount_options((char *)options, data);
1906 if (error < 0)
1907 goto out;
1908
1909 /* compare new mount options with old ones */
1910 error = nfs_compare_remount_data(nfss, data);
1911 out:
1912 kfree(data);
1913 unlock_kernel();
1914 return error;
1915 }
1916
1917 /*
1918 * Initialise the common bits of the superblock
1919 */
1920 static inline void nfs_initialise_sb(struct super_block *sb)
1921 {
1922 struct nfs_server *server = NFS_SB(sb);
1923
1924 sb->s_magic = NFS_SUPER_MAGIC;
1925
1926 /* We probably want something more informative here */
1927 snprintf(sb->s_id, sizeof(sb->s_id),
1928 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1929
1930 if (sb->s_blocksize == 0)
1931 sb->s_blocksize = nfs_block_bits(server->wsize,
1932 &sb->s_blocksize_bits);
1933
1934 if (server->flags & NFS_MOUNT_NOAC)
1935 sb->s_flags |= MS_SYNCHRONOUS;
1936
1937 nfs_super_set_maxbytes(sb, server->maxfilesize);
1938 }
1939
1940 /*
1941 * Finish setting up an NFS2/3 superblock
1942 */
1943 static void nfs_fill_super(struct super_block *sb,
1944 struct nfs_parsed_mount_data *data)
1945 {
1946 struct nfs_server *server = NFS_SB(sb);
1947
1948 sb->s_blocksize_bits = 0;
1949 sb->s_blocksize = 0;
1950 if (data->bsize)
1951 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1952
1953 if (server->flags & NFS_MOUNT_VER3) {
1954 /* The VFS shouldn't apply the umask to mode bits. We will do
1955 * so ourselves when necessary.
1956 */
1957 sb->s_flags |= MS_POSIXACL;
1958 sb->s_time_gran = 1;
1959 }
1960
1961 sb->s_op = &nfs_sops;
1962 nfs_initialise_sb(sb);
1963 }
1964
1965 /*
1966 * Finish setting up a cloned NFS2/3 superblock
1967 */
1968 static void nfs_clone_super(struct super_block *sb,
1969 const struct super_block *old_sb)
1970 {
1971 struct nfs_server *server = NFS_SB(sb);
1972
1973 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1974 sb->s_blocksize = old_sb->s_blocksize;
1975 sb->s_maxbytes = old_sb->s_maxbytes;
1976
1977 if (server->flags & NFS_MOUNT_VER3) {
1978 /* The VFS shouldn't apply the umask to mode bits. We will do
1979 * so ourselves when necessary.
1980 */
1981 sb->s_flags |= MS_POSIXACL;
1982 sb->s_time_gran = 1;
1983 }
1984
1985 sb->s_op = old_sb->s_op;
1986 nfs_initialise_sb(sb);
1987 }
1988
1989 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1990 {
1991 const struct nfs_server *a = s->s_fs_info;
1992 const struct rpc_clnt *clnt_a = a->client;
1993 const struct rpc_clnt *clnt_b = b->client;
1994
1995 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1996 goto Ebusy;
1997 if (a->nfs_client != b->nfs_client)
1998 goto Ebusy;
1999 if (a->flags != b->flags)
2000 goto Ebusy;
2001 if (a->wsize != b->wsize)
2002 goto Ebusy;
2003 if (a->rsize != b->rsize)
2004 goto Ebusy;
2005 if (a->acregmin != b->acregmin)
2006 goto Ebusy;
2007 if (a->acregmax != b->acregmax)
2008 goto Ebusy;
2009 if (a->acdirmin != b->acdirmin)
2010 goto Ebusy;
2011 if (a->acdirmax != b->acdirmax)
2012 goto Ebusy;
2013 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2014 goto Ebusy;
2015 return 1;
2016 Ebusy:
2017 return 0;
2018 }
2019
2020 struct nfs_sb_mountdata {
2021 struct nfs_server *server;
2022 int mntflags;
2023 };
2024
2025 static int nfs_set_super(struct super_block *s, void *data)
2026 {
2027 struct nfs_sb_mountdata *sb_mntdata = data;
2028 struct nfs_server *server = sb_mntdata->server;
2029 int ret;
2030
2031 s->s_flags = sb_mntdata->mntflags;
2032 s->s_fs_info = server;
2033 ret = set_anon_super(s, server);
2034 if (ret == 0)
2035 server->s_dev = s->s_dev;
2036 return ret;
2037 }
2038
2039 static int nfs_compare_super_address(struct nfs_server *server1,
2040 struct nfs_server *server2)
2041 {
2042 struct sockaddr *sap1, *sap2;
2043
2044 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2045 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2046
2047 if (sap1->sa_family != sap2->sa_family)
2048 return 0;
2049
2050 switch (sap1->sa_family) {
2051 case AF_INET: {
2052 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2053 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2054 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2055 return 0;
2056 if (sin1->sin_port != sin2->sin_port)
2057 return 0;
2058 break;
2059 }
2060 case AF_INET6: {
2061 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2062 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2063 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2064 return 0;
2065 if (sin1->sin6_port != sin2->sin6_port)
2066 return 0;
2067 break;
2068 }
2069 default:
2070 return 0;
2071 }
2072
2073 return 1;
2074 }
2075
2076 static int nfs_compare_super(struct super_block *sb, void *data)
2077 {
2078 struct nfs_sb_mountdata *sb_mntdata = data;
2079 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2080 int mntflags = sb_mntdata->mntflags;
2081
2082 if (!nfs_compare_super_address(old, server))
2083 return 0;
2084 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2085 if (old->flags & NFS_MOUNT_UNSHARED)
2086 return 0;
2087 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2088 return 0;
2089 return nfs_compare_mount_options(sb, server, mntflags);
2090 }
2091
2092 static int nfs_bdi_register(struct nfs_server *server)
2093 {
2094 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2095 }
2096
2097 static int nfs_get_sb(struct file_system_type *fs_type,
2098 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2099 {
2100 struct nfs_server *server = NULL;
2101 struct super_block *s;
2102 struct nfs_parsed_mount_data *data;
2103 struct nfs_fh *mntfh;
2104 struct dentry *mntroot;
2105 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2106 struct nfs_sb_mountdata sb_mntdata = {
2107 .mntflags = flags,
2108 };
2109 int error = -ENOMEM;
2110
2111 data = kzalloc(sizeof(*data), GFP_KERNEL);
2112 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2113 if (data == NULL || mntfh == NULL)
2114 goto out_free_fh;
2115
2116 security_init_mnt_opts(&data->lsm_opts);
2117
2118 /* Validate the mount data */
2119 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2120 if (error < 0)
2121 goto out;
2122
2123 /* Get a volume representation */
2124 server = nfs_create_server(data, mntfh);
2125 if (IS_ERR(server)) {
2126 error = PTR_ERR(server);
2127 goto out;
2128 }
2129 sb_mntdata.server = server;
2130
2131 if (server->flags & NFS_MOUNT_UNSHARED)
2132 compare_super = NULL;
2133
2134 /* Get a superblock - note that we may end up sharing one that already exists */
2135 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2136 if (IS_ERR(s)) {
2137 error = PTR_ERR(s);
2138 goto out_err_nosb;
2139 }
2140
2141 if (s->s_fs_info != server) {
2142 nfs_free_server(server);
2143 server = NULL;
2144 } else {
2145 error = nfs_bdi_register(server);
2146 if (error)
2147 goto error_splat_super;
2148 }
2149
2150 if (!s->s_root) {
2151 /* initial superblock/root creation */
2152 nfs_fill_super(s, data);
2153 nfs_fscache_get_super_cookie(s, data);
2154 }
2155
2156 mntroot = nfs_get_root(s, mntfh);
2157 if (IS_ERR(mntroot)) {
2158 error = PTR_ERR(mntroot);
2159 goto error_splat_super;
2160 }
2161
2162 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2163 if (error)
2164 goto error_splat_root;
2165
2166 s->s_flags |= MS_ACTIVE;
2167 mnt->mnt_sb = s;
2168 mnt->mnt_root = mntroot;
2169 error = 0;
2170
2171 out:
2172 kfree(data->nfs_server.hostname);
2173 kfree(data->mount_server.hostname);
2174 kfree(data->fscache_uniq);
2175 security_free_mnt_opts(&data->lsm_opts);
2176 out_free_fh:
2177 kfree(mntfh);
2178 kfree(data);
2179 return error;
2180
2181 out_err_nosb:
2182 nfs_free_server(server);
2183 goto out;
2184
2185 error_splat_root:
2186 dput(mntroot);
2187 error_splat_super:
2188 deactivate_locked_super(s);
2189 goto out;
2190 }
2191
2192 /*
2193 * Destroy an NFS2/3 superblock
2194 */
2195 static void nfs_kill_super(struct super_block *s)
2196 {
2197 struct nfs_server *server = NFS_SB(s);
2198
2199 bdi_unregister(&server->backing_dev_info);
2200 kill_anon_super(s);
2201 nfs_fscache_release_super_cookie(s);
2202 nfs_free_server(server);
2203 }
2204
2205 /*
2206 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2207 */
2208 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
2209 const char *dev_name, void *raw_data,
2210 struct vfsmount *mnt)
2211 {
2212 struct nfs_clone_mount *data = raw_data;
2213 struct super_block *s;
2214 struct nfs_server *server;
2215 struct dentry *mntroot;
2216 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2217 struct nfs_sb_mountdata sb_mntdata = {
2218 .mntflags = flags,
2219 };
2220 int error;
2221
2222 dprintk("--> nfs_xdev_get_sb()\n");
2223
2224 /* create a new volume representation */
2225 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2226 if (IS_ERR(server)) {
2227 error = PTR_ERR(server);
2228 goto out_err_noserver;
2229 }
2230 sb_mntdata.server = server;
2231
2232 if (server->flags & NFS_MOUNT_UNSHARED)
2233 compare_super = NULL;
2234
2235 /* Get a superblock - note that we may end up sharing one that already exists */
2236 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2237 if (IS_ERR(s)) {
2238 error = PTR_ERR(s);
2239 goto out_err_nosb;
2240 }
2241
2242 if (s->s_fs_info != server) {
2243 nfs_free_server(server);
2244 server = NULL;
2245 } else {
2246 error = nfs_bdi_register(server);
2247 if (error)
2248 goto error_splat_super;
2249 }
2250
2251 if (!s->s_root) {
2252 /* initial superblock/root creation */
2253 nfs_clone_super(s, data->sb);
2254 }
2255
2256 mntroot = nfs_get_root(s, data->fh);
2257 if (IS_ERR(mntroot)) {
2258 error = PTR_ERR(mntroot);
2259 goto error_splat_super;
2260 }
2261 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2262 dput(mntroot);
2263 error = -ESTALE;
2264 goto error_splat_super;
2265 }
2266
2267 s->s_flags |= MS_ACTIVE;
2268 mnt->mnt_sb = s;
2269 mnt->mnt_root = mntroot;
2270
2271 /* clone any lsm security options from the parent to the new sb */
2272 security_sb_clone_mnt_opts(data->sb, s);
2273
2274 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2275 return 0;
2276
2277 out_err_nosb:
2278 nfs_free_server(server);
2279 out_err_noserver:
2280 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2281 return error;
2282
2283 error_splat_super:
2284 deactivate_locked_super(s);
2285 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2286 return error;
2287 }
2288
2289 #ifdef CONFIG_NFS_V4
2290
2291 /*
2292 * Finish setting up a cloned NFS4 superblock
2293 */
2294 static void nfs4_clone_super(struct super_block *sb,
2295 const struct super_block *old_sb)
2296 {
2297 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2298 sb->s_blocksize = old_sb->s_blocksize;
2299 sb->s_maxbytes = old_sb->s_maxbytes;
2300 sb->s_time_gran = 1;
2301 sb->s_op = old_sb->s_op;
2302 nfs_initialise_sb(sb);
2303 }
2304
2305 /*
2306 * Set up an NFS4 superblock
2307 */
2308 static void nfs4_fill_super(struct super_block *sb)
2309 {
2310 sb->s_time_gran = 1;
2311 sb->s_op = &nfs4_sops;
2312 nfs_initialise_sb(sb);
2313 }
2314
2315 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2316 {
2317 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3);
2318 }
2319
2320 /*
2321 * Validate NFSv4 mount options
2322 */
2323 static int nfs4_validate_mount_data(void *options,
2324 struct nfs_parsed_mount_data *args,
2325 const char *dev_name)
2326 {
2327 struct sockaddr_in *ap;
2328 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2329 char *c;
2330
2331 if (data == NULL)
2332 goto out_no_data;
2333
2334 args->rsize = NFS_MAX_FILE_IO_SIZE;
2335 args->wsize = NFS_MAX_FILE_IO_SIZE;
2336 args->acregmin = NFS_DEF_ACREGMIN;
2337 args->acregmax = NFS_DEF_ACREGMAX;
2338 args->acdirmin = NFS_DEF_ACDIRMIN;
2339 args->acdirmax = NFS_DEF_ACDIRMAX;
2340 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2341 args->auth_flavors[0] = RPC_AUTH_UNIX;
2342 args->auth_flavor_len = 0;
2343 args->minorversion = 0;
2344
2345 switch (data->version) {
2346 case 1:
2347 ap = (struct sockaddr_in *)&args->nfs_server.address;
2348 if (data->host_addrlen > sizeof(args->nfs_server.address))
2349 goto out_no_address;
2350 if (data->host_addrlen == 0)
2351 goto out_no_address;
2352 args->nfs_server.addrlen = data->host_addrlen;
2353 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2354 return -EFAULT;
2355 if (!nfs_verify_server_address((struct sockaddr *)
2356 &args->nfs_server.address))
2357 goto out_no_address;
2358
2359 if (data->auth_flavourlen) {
2360 if (data->auth_flavourlen > 1)
2361 goto out_inval_auth;
2362 if (copy_from_user(&args->auth_flavors[0],
2363 data->auth_flavours,
2364 sizeof(args->auth_flavors[0])))
2365 return -EFAULT;
2366 }
2367
2368 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2369 if (IS_ERR(c))
2370 return PTR_ERR(c);
2371 args->nfs_server.hostname = c;
2372
2373 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2374 if (IS_ERR(c))
2375 return PTR_ERR(c);
2376 args->nfs_server.export_path = c;
2377 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2378
2379 c = strndup_user(data->client_addr.data, 16);
2380 if (IS_ERR(c))
2381 return PTR_ERR(c);
2382 args->client_address = c;
2383
2384 /*
2385 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2386 * can deal with.
2387 */
2388
2389 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2390 args->rsize = data->rsize;
2391 args->wsize = data->wsize;
2392 args->timeo = data->timeo;
2393 args->retrans = data->retrans;
2394 args->acregmin = data->acregmin;
2395 args->acregmax = data->acregmax;
2396 args->acdirmin = data->acdirmin;
2397 args->acdirmax = data->acdirmax;
2398 args->nfs_server.protocol = data->proto;
2399 nfs_validate_transport_protocol(args);
2400
2401 break;
2402 default: {
2403 int status;
2404
2405 if (nfs_parse_mount_options((char *)options, args) == 0)
2406 return -EINVAL;
2407
2408 if (!nfs_verify_server_address((struct sockaddr *)
2409 &args->nfs_server.address))
2410 return -EINVAL;
2411
2412 nfs_set_port((struct sockaddr *)&args->nfs_server.address,
2413 args->nfs_server.port);
2414
2415 nfs_validate_transport_protocol(args);
2416
2417 nfs4_validate_mount_flags(args);
2418
2419 if (args->auth_flavor_len > 1)
2420 goto out_inval_auth;
2421
2422 if (args->client_address == NULL)
2423 goto out_no_client_address;
2424
2425 status = nfs_parse_devname(dev_name,
2426 &args->nfs_server.hostname,
2427 NFS4_MAXNAMLEN,
2428 &args->nfs_server.export_path,
2429 NFS4_MAXPATHLEN);
2430 if (status < 0)
2431 return status;
2432
2433 break;
2434 }
2435 }
2436
2437 return 0;
2438
2439 out_no_data:
2440 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2441 return -EINVAL;
2442
2443 out_inval_auth:
2444 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2445 data->auth_flavourlen);
2446 return -EINVAL;
2447
2448 out_no_address:
2449 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2450 return -EINVAL;
2451
2452 out_no_client_address:
2453 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2454 return -EINVAL;
2455 }
2456
2457 /*
2458 * Get the superblock for the NFS4 root partition
2459 */
2460 static int nfs4_remote_get_sb(struct file_system_type *fs_type,
2461 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2462 {
2463 struct nfs_parsed_mount_data *data = raw_data;
2464 struct super_block *s;
2465 struct nfs_server *server;
2466 struct nfs_fh *mntfh;
2467 struct dentry *mntroot;
2468 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2469 struct nfs_sb_mountdata sb_mntdata = {
2470 .mntflags = flags,
2471 };
2472 int error = -ENOMEM;
2473
2474 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2475 if (data == NULL || mntfh == NULL)
2476 goto out_free_fh;
2477
2478 security_init_mnt_opts(&data->lsm_opts);
2479
2480 /* Get a volume representation */
2481 server = nfs4_create_server(data, mntfh);
2482 if (IS_ERR(server)) {
2483 error = PTR_ERR(server);
2484 goto out;
2485 }
2486 sb_mntdata.server = server;
2487
2488 if (server->flags & NFS4_MOUNT_UNSHARED)
2489 compare_super = NULL;
2490
2491 /* Get a superblock - note that we may end up sharing one that already exists */
2492 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2493 if (IS_ERR(s)) {
2494 error = PTR_ERR(s);
2495 goto out_free;
2496 }
2497
2498 if (s->s_fs_info != server) {
2499 nfs_free_server(server);
2500 server = NULL;
2501 } else {
2502 error = nfs_bdi_register(server);
2503 if (error)
2504 goto error_splat_super;
2505 }
2506
2507 if (!s->s_root) {
2508 /* initial superblock/root creation */
2509 nfs4_fill_super(s);
2510 nfs_fscache_get_super_cookie(s, data);
2511 }
2512
2513 mntroot = nfs4_get_root(s, mntfh);
2514 if (IS_ERR(mntroot)) {
2515 error = PTR_ERR(mntroot);
2516 goto error_splat_super;
2517 }
2518
2519 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2520 if (error)
2521 goto error_splat_root;
2522
2523 s->s_flags |= MS_ACTIVE;
2524 mnt->mnt_sb = s;
2525 mnt->mnt_root = mntroot;
2526 error = 0;
2527
2528 out:
2529 security_free_mnt_opts(&data->lsm_opts);
2530 out_free_fh:
2531 kfree(mntfh);
2532 return error;
2533
2534 out_free:
2535 nfs_free_server(server);
2536 goto out;
2537
2538 error_splat_root:
2539 dput(mntroot);
2540 error_splat_super:
2541 deactivate_locked_super(s);
2542 goto out;
2543 }
2544
2545 static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2546 int flags, void *data, const char *hostname)
2547 {
2548 struct vfsmount *root_mnt;
2549 char *root_devname;
2550 size_t len;
2551
2552 len = strlen(hostname) + 3;
2553 root_devname = kmalloc(len, GFP_KERNEL);
2554 if (root_devname == NULL)
2555 return ERR_PTR(-ENOMEM);
2556 snprintf(root_devname, len, "%s:/", hostname);
2557 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2558 kfree(root_devname);
2559 return root_mnt;
2560 }
2561
2562 static int nfs_follow_remote_path(struct vfsmount *root_mnt,
2563 const char *export_path, struct vfsmount *mnt_target)
2564 {
2565 struct mnt_namespace *ns_private;
2566 struct nameidata nd;
2567 struct super_block *s;
2568 int ret;
2569
2570 ns_private = create_mnt_ns(root_mnt);
2571 ret = PTR_ERR(ns_private);
2572 if (IS_ERR(ns_private))
2573 goto out_mntput;
2574
2575 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
2576 export_path, LOOKUP_FOLLOW, &nd);
2577
2578 put_mnt_ns(ns_private);
2579
2580 if (ret != 0)
2581 goto out_err;
2582
2583 s = nd.path.mnt->mnt_sb;
2584 atomic_inc(&s->s_active);
2585 mnt_target->mnt_sb = s;
2586 mnt_target->mnt_root = dget(nd.path.dentry);
2587
2588 path_put(&nd.path);
2589 down_write(&s->s_umount);
2590 return 0;
2591 out_mntput:
2592 mntput(root_mnt);
2593 out_err:
2594 return ret;
2595 }
2596
2597 /*
2598 * Get the superblock for an NFS4 mountpoint
2599 */
2600 static int nfs4_get_sb(struct file_system_type *fs_type,
2601 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2602 {
2603 struct nfs_parsed_mount_data *data;
2604 char *export_path;
2605 struct vfsmount *root_mnt;
2606 int error = -ENOMEM;
2607
2608 data = kzalloc(sizeof(*data), GFP_KERNEL);
2609 if (data == NULL)
2610 goto out_free_data;
2611
2612 /* Validate the mount data */
2613 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2614 if (error < 0)
2615 goto out;
2616
2617 export_path = data->nfs_server.export_path;
2618 data->nfs_server.export_path = "/";
2619 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2620 data->nfs_server.hostname);
2621 data->nfs_server.export_path = export_path;
2622
2623 error = PTR_ERR(root_mnt);
2624 if (IS_ERR(root_mnt))
2625 goto out;
2626
2627 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2628
2629 out:
2630 kfree(data->client_address);
2631 kfree(data->nfs_server.export_path);
2632 kfree(data->nfs_server.hostname);
2633 kfree(data->fscache_uniq);
2634 out_free_data:
2635 kfree(data);
2636 dprintk("<-- nfs4_get_sb() = %d%s\n", error,
2637 error != 0 ? " [error]" : "");
2638 return error;
2639 }
2640
2641 static void nfs4_kill_super(struct super_block *sb)
2642 {
2643 struct nfs_server *server = NFS_SB(sb);
2644
2645 dprintk("--> %s\n", __func__);
2646 nfs_super_return_all_delegations(sb);
2647 kill_anon_super(sb);
2648 nfs4_renewd_prepare_shutdown(server);
2649 nfs_fscache_release_super_cookie(sb);
2650 nfs_free_server(server);
2651 dprintk("<-- %s\n", __func__);
2652 }
2653
2654 /*
2655 * Clone an NFS4 server record on xdev traversal (FSID-change)
2656 */
2657 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2658 const char *dev_name, void *raw_data,
2659 struct vfsmount *mnt)
2660 {
2661 struct nfs_clone_mount *data = raw_data;
2662 struct super_block *s;
2663 struct nfs_server *server;
2664 struct dentry *mntroot;
2665 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2666 struct nfs_sb_mountdata sb_mntdata = {
2667 .mntflags = flags,
2668 };
2669 int error;
2670
2671 dprintk("--> nfs4_xdev_get_sb()\n");
2672
2673 /* create a new volume representation */
2674 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2675 if (IS_ERR(server)) {
2676 error = PTR_ERR(server);
2677 goto out_err_noserver;
2678 }
2679 sb_mntdata.server = server;
2680
2681 if (server->flags & NFS4_MOUNT_UNSHARED)
2682 compare_super = NULL;
2683
2684 /* Get a superblock - note that we may end up sharing one that already exists */
2685 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2686 if (IS_ERR(s)) {
2687 error = PTR_ERR(s);
2688 goto out_err_nosb;
2689 }
2690
2691 if (s->s_fs_info != server) {
2692 nfs_free_server(server);
2693 server = NULL;
2694 } else {
2695 error = nfs_bdi_register(server);
2696 if (error)
2697 goto error_splat_super;
2698 }
2699
2700 if (!s->s_root) {
2701 /* initial superblock/root creation */
2702 nfs4_clone_super(s, data->sb);
2703 }
2704
2705 mntroot = nfs4_get_root(s, data->fh);
2706 if (IS_ERR(mntroot)) {
2707 error = PTR_ERR(mntroot);
2708 goto error_splat_super;
2709 }
2710 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2711 dput(mntroot);
2712 error = -ESTALE;
2713 goto error_splat_super;
2714 }
2715
2716 s->s_flags |= MS_ACTIVE;
2717 mnt->mnt_sb = s;
2718 mnt->mnt_root = mntroot;
2719
2720 security_sb_clone_mnt_opts(data->sb, s);
2721
2722 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2723 return 0;
2724
2725 out_err_nosb:
2726 nfs_free_server(server);
2727 out_err_noserver:
2728 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2729 return error;
2730
2731 error_splat_super:
2732 deactivate_locked_super(s);
2733 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2734 return error;
2735 }
2736
2737 static int nfs4_remote_referral_get_sb(struct file_system_type *fs_type,
2738 int flags, const char *dev_name, void *raw_data,
2739 struct vfsmount *mnt)
2740 {
2741 struct nfs_clone_mount *data = raw_data;
2742 struct super_block *s;
2743 struct nfs_server *server;
2744 struct dentry *mntroot;
2745 struct nfs_fh mntfh;
2746 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2747 struct nfs_sb_mountdata sb_mntdata = {
2748 .mntflags = flags,
2749 };
2750 int error;
2751
2752 dprintk("--> nfs4_referral_get_sb()\n");
2753
2754 /* create a new volume representation */
2755 server = nfs4_create_referral_server(data, &mntfh);
2756 if (IS_ERR(server)) {
2757 error = PTR_ERR(server);
2758 goto out_err_noserver;
2759 }
2760 sb_mntdata.server = server;
2761
2762 if (server->flags & NFS4_MOUNT_UNSHARED)
2763 compare_super = NULL;
2764
2765 /* Get a superblock - note that we may end up sharing one that already exists */
2766 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2767 if (IS_ERR(s)) {
2768 error = PTR_ERR(s);
2769 goto out_err_nosb;
2770 }
2771
2772 if (s->s_fs_info != server) {
2773 nfs_free_server(server);
2774 server = NULL;
2775 } else {
2776 error = nfs_bdi_register(server);
2777 if (error)
2778 goto error_splat_super;
2779 }
2780
2781 if (!s->s_root) {
2782 /* initial superblock/root creation */
2783 nfs4_fill_super(s);
2784 }
2785
2786 mntroot = nfs4_get_root(s, &mntfh);
2787 if (IS_ERR(mntroot)) {
2788 error = PTR_ERR(mntroot);
2789 goto error_splat_super;
2790 }
2791 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2792 dput(mntroot);
2793 error = -ESTALE;
2794 goto error_splat_super;
2795 }
2796
2797 s->s_flags |= MS_ACTIVE;
2798 mnt->mnt_sb = s;
2799 mnt->mnt_root = mntroot;
2800
2801 security_sb_clone_mnt_opts(data->sb, s);
2802
2803 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2804 return 0;
2805
2806 out_err_nosb:
2807 nfs_free_server(server);
2808 out_err_noserver:
2809 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2810 return error;
2811
2812 error_splat_super:
2813 deactivate_locked_super(s);
2814 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2815 return error;
2816 }
2817
2818 /*
2819 * Create an NFS4 server record on referral traversal
2820 */
2821 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
2822 int flags, const char *dev_name, void *raw_data,
2823 struct vfsmount *mnt)
2824 {
2825 struct nfs_clone_mount *data = raw_data;
2826 char *export_path;
2827 struct vfsmount *root_mnt;
2828 int error;
2829
2830 dprintk("--> nfs4_referral_get_sb()\n");
2831
2832 export_path = data->mnt_path;
2833 data->mnt_path = "/";
2834
2835 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2836 flags, data, data->hostname);
2837 data->mnt_path = export_path;
2838
2839 error = PTR_ERR(root_mnt);
2840 if (IS_ERR(root_mnt))
2841 goto out;
2842
2843 error = nfs_follow_remote_path(root_mnt, export_path, mnt);
2844 out:
2845 dprintk("<-- nfs4_referral_get_sb() = %d%s\n", error,
2846 error != 0 ? " [error]" : "");
2847 return error;
2848 }
2849
2850 #endif /* CONFIG_NFS_V4 */
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