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NFS: Allow any value for the "retry" option
[linux-2.6/libata-dev.git] / fs / nfs / super.c
blob5278eef6111013705f94bbc912279814d410adea
1 /*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <net/ipv6.h>
50 #include <linux/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
53
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
56
57 #include "nfs4_fs.h"
58 #include "callback.h"
59 #include "delegation.h"
60 #include "iostat.h"
61 #include "internal.h"
62
63 #define NFSDBG_FACILITY NFSDBG_VFS
64
65 enum {
66 /* Mount options that take no arguments */
67 Opt_soft, Opt_hard,
68 Opt_intr, Opt_nointr,
69 Opt_posix, Opt_noposix,
70 Opt_cto, Opt_nocto,
71 Opt_ac, Opt_noac,
72 Opt_lock, Opt_nolock,
73 Opt_v2, Opt_v3,
74 Opt_udp, Opt_tcp, Opt_rdma,
75 Opt_acl, Opt_noacl,
76 Opt_rdirplus, Opt_nordirplus,
77 Opt_sharecache, Opt_nosharecache,
78
79 /* Mount options that take integer arguments */
80 Opt_port,
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
85 Opt_actimeo,
86 Opt_namelen,
87 Opt_mountport,
88 Opt_mountvers,
89 Opt_nfsvers,
90
91 /* Mount options that take string arguments */
92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
94
95 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
97
98 Opt_err
99 };
100
101 static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_userspace, "retry=%s" },
105
106 { Opt_soft, "soft" },
107 { Opt_hard, "hard" },
108 { Opt_intr, "intr" },
109 { Opt_nointr, "nointr" },
110 { Opt_posix, "posix" },
111 { Opt_noposix, "noposix" },
112 { Opt_cto, "cto" },
113 { Opt_nocto, "nocto" },
114 { Opt_ac, "ac" },
115 { Opt_noac, "noac" },
116 { Opt_lock, "lock" },
117 { Opt_nolock, "nolock" },
118 { Opt_v2, "v2" },
119 { Opt_v3, "v3" },
120 { Opt_udp, "udp" },
121 { Opt_tcp, "tcp" },
122 { Opt_rdma, "rdma" },
123 { Opt_acl, "acl" },
124 { Opt_noacl, "noacl" },
125 { Opt_rdirplus, "rdirplus" },
126 { Opt_nordirplus, "nordirplus" },
127 { Opt_sharecache, "sharecache" },
128 { Opt_nosharecache, "nosharecache" },
129
130 { Opt_port, "port=%u" },
131 { Opt_rsize, "rsize=%u" },
132 { Opt_wsize, "wsize=%u" },
133 { Opt_bsize, "bsize=%u" },
134 { Opt_timeo, "timeo=%u" },
135 { Opt_retrans, "retrans=%u" },
136 { Opt_acregmin, "acregmin=%u" },
137 { Opt_acregmax, "acregmax=%u" },
138 { Opt_acdirmin, "acdirmin=%u" },
139 { Opt_acdirmax, "acdirmax=%u" },
140 { Opt_actimeo, "actimeo=%u" },
141 { Opt_namelen, "namlen=%u" },
142 { Opt_mountport, "mountport=%u" },
143 { Opt_mountvers, "mountvers=%u" },
144 { Opt_nfsvers, "nfsvers=%u" },
145 { Opt_nfsvers, "vers=%u" },
146
147 { Opt_sec, "sec=%s" },
148 { Opt_proto, "proto=%s" },
149 { Opt_mountproto, "mountproto=%s" },
150 { Opt_addr, "addr=%s" },
151 { Opt_clientaddr, "clientaddr=%s" },
152 { Opt_mounthost, "mounthost=%s" },
153 { Opt_mountaddr, "mountaddr=%s" },
154
155 { Opt_err, NULL }
156 };
157
158 enum {
159 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
160
161 Opt_xprt_err
162 };
163
164 static match_table_t nfs_xprt_protocol_tokens = {
165 { Opt_xprt_udp, "udp" },
166 { Opt_xprt_tcp, "tcp" },
167 { Opt_xprt_rdma, "rdma" },
168
169 { Opt_xprt_err, NULL }
170 };
171
172 enum {
173 Opt_sec_none, Opt_sec_sys,
174 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
175 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
176 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
177
178 Opt_sec_err
179 };
180
181 static match_table_t nfs_secflavor_tokens = {
182 { Opt_sec_none, "none" },
183 { Opt_sec_none, "null" },
184 { Opt_sec_sys, "sys" },
185
186 { Opt_sec_krb5, "krb5" },
187 { Opt_sec_krb5i, "krb5i" },
188 { Opt_sec_krb5p, "krb5p" },
189
190 { Opt_sec_lkey, "lkey" },
191 { Opt_sec_lkeyi, "lkeyi" },
192 { Opt_sec_lkeyp, "lkeyp" },
193
194 { Opt_sec_spkm, "spkm3" },
195 { Opt_sec_spkmi, "spkm3i" },
196 { Opt_sec_spkmp, "spkm3p" },
197
198 { Opt_sec_err, NULL }
199 };
200
201
202 static void nfs_umount_begin(struct super_block *);
203 static int nfs_statfs(struct dentry *, struct kstatfs *);
204 static int nfs_show_options(struct seq_file *, struct vfsmount *);
205 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
206 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
207 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
208 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
209 static void nfs_kill_super(struct super_block *);
210 static void nfs_put_super(struct super_block *);
211 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
212
213 static struct file_system_type nfs_fs_type = {
214 .owner = THIS_MODULE,
215 .name = "nfs",
216 .get_sb = nfs_get_sb,
217 .kill_sb = nfs_kill_super,
218 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
219 };
220
221 struct file_system_type nfs_xdev_fs_type = {
222 .owner = THIS_MODULE,
223 .name = "nfs",
224 .get_sb = nfs_xdev_get_sb,
225 .kill_sb = nfs_kill_super,
226 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
227 };
228
229 static const struct super_operations nfs_sops = {
230 .alloc_inode = nfs_alloc_inode,
231 .destroy_inode = nfs_destroy_inode,
232 .write_inode = nfs_write_inode,
233 .put_super = nfs_put_super,
234 .statfs = nfs_statfs,
235 .clear_inode = nfs_clear_inode,
236 .umount_begin = nfs_umount_begin,
237 .show_options = nfs_show_options,
238 .show_stats = nfs_show_stats,
239 .remount_fs = nfs_remount,
240 };
241
242 #ifdef CONFIG_NFS_V4
243 static int nfs4_get_sb(struct file_system_type *fs_type,
244 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
245 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
246 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
247 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
248 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
249 static void nfs4_kill_super(struct super_block *sb);
250
251 static struct file_system_type nfs4_fs_type = {
252 .owner = THIS_MODULE,
253 .name = "nfs4",
254 .get_sb = nfs4_get_sb,
255 .kill_sb = nfs4_kill_super,
256 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
257 };
258
259 struct file_system_type nfs4_xdev_fs_type = {
260 .owner = THIS_MODULE,
261 .name = "nfs4",
262 .get_sb = nfs4_xdev_get_sb,
263 .kill_sb = nfs4_kill_super,
264 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
265 };
266
267 struct file_system_type nfs4_referral_fs_type = {
268 .owner = THIS_MODULE,
269 .name = "nfs4",
270 .get_sb = nfs4_referral_get_sb,
271 .kill_sb = nfs4_kill_super,
272 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
273 };
274
275 static const struct super_operations nfs4_sops = {
276 .alloc_inode = nfs_alloc_inode,
277 .destroy_inode = nfs_destroy_inode,
278 .write_inode = nfs_write_inode,
279 .statfs = nfs_statfs,
280 .clear_inode = nfs4_clear_inode,
281 .umount_begin = nfs_umount_begin,
282 .show_options = nfs_show_options,
283 .show_stats = nfs_show_stats,
284 .remount_fs = nfs_remount,
285 };
286 #endif
287
288 static struct shrinker acl_shrinker = {
289 .shrink = nfs_access_cache_shrinker,
290 .seeks = DEFAULT_SEEKS,
291 };
292
293 /*
294 * Register the NFS filesystems
295 */
296 int __init register_nfs_fs(void)
297 {
298 int ret;
299
300 ret = register_filesystem(&nfs_fs_type);
301 if (ret < 0)
302 goto error_0;
303
304 ret = nfs_register_sysctl();
305 if (ret < 0)
306 goto error_1;
307 #ifdef CONFIG_NFS_V4
308 ret = register_filesystem(&nfs4_fs_type);
309 if (ret < 0)
310 goto error_2;
311 #endif
312 register_shrinker(&acl_shrinker);
313 return 0;
314
315 #ifdef CONFIG_NFS_V4
316 error_2:
317 nfs_unregister_sysctl();
318 #endif
319 error_1:
320 unregister_filesystem(&nfs_fs_type);
321 error_0:
322 return ret;
323 }
324
325 /*
326 * Unregister the NFS filesystems
327 */
328 void __exit unregister_nfs_fs(void)
329 {
330 unregister_shrinker(&acl_shrinker);
331 #ifdef CONFIG_NFS_V4
332 unregister_filesystem(&nfs4_fs_type);
333 #endif
334 nfs_unregister_sysctl();
335 unregister_filesystem(&nfs_fs_type);
336 }
337
338 void nfs_sb_active(struct nfs_server *server)
339 {
340 atomic_inc(&server->active);
341 }
342
343 void nfs_sb_deactive(struct nfs_server *server)
344 {
345 if (atomic_dec_and_test(&server->active))
346 wake_up(&server->active_wq);
347 }
348
349 static void nfs_put_super(struct super_block *sb)
350 {
351 struct nfs_server *server = NFS_SB(sb);
352 /*
353 * Make sure there are no outstanding ops to this server.
354 * If so, wait for them to finish before allowing the
355 * unmount to continue.
356 */
357 wait_event(server->active_wq, atomic_read(&server->active) == 0);
358 }
359
360 /*
361 * Deliver file system statistics to userspace
362 */
363 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
364 {
365 struct nfs_server *server = NFS_SB(dentry->d_sb);
366 unsigned char blockbits;
367 unsigned long blockres;
368 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
369 struct nfs_fattr fattr;
370 struct nfs_fsstat res = {
371 .fattr = &fattr,
372 };
373 int error;
374
375 lock_kernel();
376
377 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
378 if (error < 0)
379 goto out_err;
380 buf->f_type = NFS_SUPER_MAGIC;
381
382 /*
383 * Current versions of glibc do not correctly handle the
384 * case where f_frsize != f_bsize. Eventually we want to
385 * report the value of wtmult in this field.
386 */
387 buf->f_frsize = dentry->d_sb->s_blocksize;
388
389 /*
390 * On most *nix systems, f_blocks, f_bfree, and f_bavail
391 * are reported in units of f_frsize. Linux hasn't had
392 * an f_frsize field in its statfs struct until recently,
393 * thus historically Linux's sys_statfs reports these
394 * fields in units of f_bsize.
395 */
396 buf->f_bsize = dentry->d_sb->s_blocksize;
397 blockbits = dentry->d_sb->s_blocksize_bits;
398 blockres = (1 << blockbits) - 1;
399 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
400 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
401 buf->f_bavail = (res.abytes + blockres) >> blockbits;
402
403 buf->f_files = res.tfiles;
404 buf->f_ffree = res.afiles;
405
406 buf->f_namelen = server->namelen;
407
408 unlock_kernel();
409 return 0;
410
411 out_err:
412 dprintk("%s: statfs error = %d\n", __func__, -error);
413 unlock_kernel();
414 return error;
415 }
416
417 /*
418 * Map the security flavour number to a name
419 */
420 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
421 {
422 static const struct {
423 rpc_authflavor_t flavour;
424 const char *str;
425 } sec_flavours[] = {
426 { RPC_AUTH_NULL, "null" },
427 { RPC_AUTH_UNIX, "sys" },
428 { RPC_AUTH_GSS_KRB5, "krb5" },
429 { RPC_AUTH_GSS_KRB5I, "krb5i" },
430 { RPC_AUTH_GSS_KRB5P, "krb5p" },
431 { RPC_AUTH_GSS_LKEY, "lkey" },
432 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
433 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
434 { RPC_AUTH_GSS_SPKM, "spkm" },
435 { RPC_AUTH_GSS_SPKMI, "spkmi" },
436 { RPC_AUTH_GSS_SPKMP, "spkmp" },
437 { UINT_MAX, "unknown" }
438 };
439 int i;
440
441 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
442 if (sec_flavours[i].flavour == flavour)
443 break;
444 }
445 return sec_flavours[i].str;
446 }
447
448 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
449 int showdefaults)
450 {
451 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
452
453 switch (sap->sa_family) {
454 case AF_INET: {
455 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
456 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
457 NIPQUAD(sin->sin_addr.s_addr));
458 break;
459 }
460 case AF_INET6: {
461 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
462 seq_printf(m, ",mountaddr=" NIP6_FMT,
463 NIP6(sin6->sin6_addr));
464 break;
465 }
466 default:
467 if (showdefaults)
468 seq_printf(m, ",mountaddr=unspecified");
469 }
470
471 if (nfss->mountd_version || showdefaults)
472 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
473 if (nfss->mountd_port || showdefaults)
474 seq_printf(m, ",mountport=%u", nfss->mountd_port);
475
476 switch (nfss->mountd_protocol) {
477 case IPPROTO_UDP:
478 seq_printf(m, ",mountproto=udp");
479 break;
480 case IPPROTO_TCP:
481 seq_printf(m, ",mountproto=tcp");
482 break;
483 default:
484 if (showdefaults)
485 seq_printf(m, ",mountproto=auto");
486 }
487 }
488
489 /*
490 * Describe the mount options in force on this server representation
491 */
492 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
493 int showdefaults)
494 {
495 static const struct proc_nfs_info {
496 int flag;
497 const char *str;
498 const char *nostr;
499 } nfs_info[] = {
500 { NFS_MOUNT_SOFT, ",soft", ",hard" },
501 { NFS_MOUNT_INTR, ",intr", ",nointr" },
502 { NFS_MOUNT_POSIX, ",posix", "" },
503 { NFS_MOUNT_NOCTO, ",nocto", "" },
504 { NFS_MOUNT_NOAC, ",noac", "" },
505 { NFS_MOUNT_NONLM, ",nolock", "" },
506 { NFS_MOUNT_NOACL, ",noacl", "" },
507 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
508 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
509 { 0, NULL, NULL }
510 };
511 const struct proc_nfs_info *nfs_infop;
512 struct nfs_client *clp = nfss->nfs_client;
513 u32 version = clp->rpc_ops->version;
514
515 seq_printf(m, ",vers=%u", version);
516 seq_printf(m, ",rsize=%u", nfss->rsize);
517 seq_printf(m, ",wsize=%u", nfss->wsize);
518 if (nfss->bsize != 0)
519 seq_printf(m, ",bsize=%u", nfss->bsize);
520 seq_printf(m, ",namlen=%u", nfss->namelen);
521 if (nfss->acregmin != 3*HZ || showdefaults)
522 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
523 if (nfss->acregmax != 60*HZ || showdefaults)
524 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
525 if (nfss->acdirmin != 30*HZ || showdefaults)
526 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
527 if (nfss->acdirmax != 60*HZ || showdefaults)
528 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
529 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
530 if (nfss->flags & nfs_infop->flag)
531 seq_puts(m, nfs_infop->str);
532 else
533 seq_puts(m, nfs_infop->nostr);
534 }
535 seq_printf(m, ",proto=%s",
536 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
537 if (version == 4) {
538 if (nfss->port != NFS_PORT)
539 seq_printf(m, ",port=%u", nfss->port);
540 } else
541 if (nfss->port)
542 seq_printf(m, ",port=%u", nfss->port);
543
544 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
545 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
546 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
547
548 if (version != 4)
549 nfs_show_mountd_options(m, nfss, showdefaults);
550
551 #ifdef CONFIG_NFS_V4
552 if (clp->rpc_ops->version == 4)
553 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
554 #endif
555 }
556
557 /*
558 * Describe the mount options on this VFS mountpoint
559 */
560 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
561 {
562 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
563
564 nfs_show_mount_options(m, nfss, 0);
565
566 seq_printf(m, ",addr=%s",
567 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
568 RPC_DISPLAY_ADDR));
569
570 return 0;
571 }
572
573 /*
574 * Present statistical information for this VFS mountpoint
575 */
576 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
577 {
578 int i, cpu;
579 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
580 struct rpc_auth *auth = nfss->client->cl_auth;
581 struct nfs_iostats totals = { };
582
583 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
584
585 /*
586 * Display all mount option settings
587 */
588 seq_printf(m, "\n\topts:\t");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
592 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
593 nfs_show_mount_options(m, nfss, 1);
594
595 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
596
597 seq_printf(m, "\n\tcaps:\t");
598 seq_printf(m, "caps=0x%x", nfss->caps);
599 seq_printf(m, ",wtmult=%u", nfss->wtmult);
600 seq_printf(m, ",dtsize=%u", nfss->dtsize);
601 seq_printf(m, ",bsize=%u", nfss->bsize);
602 seq_printf(m, ",namlen=%u", nfss->namelen);
603
604 #ifdef CONFIG_NFS_V4
605 if (nfss->nfs_client->rpc_ops->version == 4) {
606 seq_printf(m, "\n\tnfsv4:\t");
607 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
608 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
609 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
610 }
611 #endif
612
613 /*
614 * Display security flavor in effect for this mount
615 */
616 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
617 if (auth->au_flavor)
618 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
619
620 /*
621 * Display superblock I/O counters
622 */
623 for_each_possible_cpu(cpu) {
624 struct nfs_iostats *stats;
625
626 preempt_disable();
627 stats = per_cpu_ptr(nfss->io_stats, cpu);
628
629 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
630 totals.events[i] += stats->events[i];
631 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
632 totals.bytes[i] += stats->bytes[i];
633
634 preempt_enable();
635 }
636
637 seq_printf(m, "\n\tevents:\t");
638 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
639 seq_printf(m, "%lu ", totals.events[i]);
640 seq_printf(m, "\n\tbytes:\t");
641 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
642 seq_printf(m, "%Lu ", totals.bytes[i]);
643 seq_printf(m, "\n");
644
645 rpc_print_iostats(m, nfss->client);
646
647 return 0;
648 }
649
650 /*
651 * Begin unmount by attempting to remove all automounted mountpoints we added
652 * in response to xdev traversals and referrals
653 */
654 static void nfs_umount_begin(struct super_block *sb)
655 {
656 struct nfs_server *server = NFS_SB(sb);
657 struct rpc_clnt *rpc;
658
659 /* -EIO all pending I/O */
660 rpc = server->client_acl;
661 if (!IS_ERR(rpc))
662 rpc_killall_tasks(rpc);
663 rpc = server->client;
664 if (!IS_ERR(rpc))
665 rpc_killall_tasks(rpc);
666 }
667
668 /*
669 * Set the port number in an address. Be agnostic about the address family.
670 */
671 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
672 {
673 switch (sap->sa_family) {
674 case AF_INET: {
675 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
676 ap->sin_port = htons(port);
677 break;
678 }
679 case AF_INET6: {
680 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
681 ap->sin6_port = htons(port);
682 break;
683 }
684 }
685 }
686
687 /*
688 * Sanity-check a server address provided by the mount command.
689 *
690 * Address family must be initialized, and address must not be
691 * the ANY address for that family.
692 */
693 static int nfs_verify_server_address(struct sockaddr *addr)
694 {
695 switch (addr->sa_family) {
696 case AF_INET: {
697 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
698 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
699 }
700 case AF_INET6: {
701 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
702 return !ipv6_addr_any(sa);
703 }
704 }
705
706 return 0;
707 }
708
709 /*
710 * Parse string addresses passed in via a mount option,
711 * and construct a sockaddr based on the result.
712 *
713 * If address parsing fails, set the sockaddr's address
714 * family to AF_UNSPEC to force nfs_verify_server_address()
715 * to punt the mount.
716 */
717 static void nfs_parse_server_address(char *value,
718 struct sockaddr *sap,
719 size_t *len)
720 {
721 if (strchr(value, ':')) {
722 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
723 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
724
725 ap->sin6_family = AF_INET6;
726 *len = sizeof(*ap);
727 if (in6_pton(value, -1, addr, '\0', NULL))
728 return;
729 } else {
730 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
731 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
732
733 ap->sin_family = AF_INET;
734 *len = sizeof(*ap);
735 if (in4_pton(value, -1, addr, '\0', NULL))
736 return;
737 }
738
739 sap->sa_family = AF_UNSPEC;
740 *len = 0;
741 }
742
743 /*
744 * Error-check and convert a string of mount options from user space into
745 * a data structure
746 */
747 static int nfs_parse_mount_options(char *raw,
748 struct nfs_parsed_mount_data *mnt)
749 {
750 char *p, *string, *secdata;
751 int rc;
752
753 if (!raw) {
754 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
755 return 1;
756 }
757 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
758
759 secdata = alloc_secdata();
760 if (!secdata)
761 goto out_nomem;
762
763 rc = security_sb_copy_data(raw, secdata);
764 if (rc)
765 goto out_security_failure;
766
767 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
768 if (rc)
769 goto out_security_failure;
770
771 free_secdata(secdata);
772
773 while ((p = strsep(&raw, ",")) != NULL) {
774 substring_t args[MAX_OPT_ARGS];
775 int option, token;
776
777 if (!*p)
778 continue;
779
780 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
781
782 token = match_token(p, nfs_mount_option_tokens, args);
783 switch (token) {
784 case Opt_soft:
785 mnt->flags |= NFS_MOUNT_SOFT;
786 break;
787 case Opt_hard:
788 mnt->flags &= ~NFS_MOUNT_SOFT;
789 break;
790 case Opt_intr:
791 case Opt_nointr:
792 break;
793 case Opt_posix:
794 mnt->flags |= NFS_MOUNT_POSIX;
795 break;
796 case Opt_noposix:
797 mnt->flags &= ~NFS_MOUNT_POSIX;
798 break;
799 case Opt_cto:
800 mnt->flags &= ~NFS_MOUNT_NOCTO;
801 break;
802 case Opt_nocto:
803 mnt->flags |= NFS_MOUNT_NOCTO;
804 break;
805 case Opt_ac:
806 mnt->flags &= ~NFS_MOUNT_NOAC;
807 break;
808 case Opt_noac:
809 mnt->flags |= NFS_MOUNT_NOAC;
810 break;
811 case Opt_lock:
812 mnt->flags &= ~NFS_MOUNT_NONLM;
813 break;
814 case Opt_nolock:
815 mnt->flags |= NFS_MOUNT_NONLM;
816 break;
817 case Opt_v2:
818 mnt->flags &= ~NFS_MOUNT_VER3;
819 break;
820 case Opt_v3:
821 mnt->flags |= NFS_MOUNT_VER3;
822 break;
823 case Opt_udp:
824 mnt->flags &= ~NFS_MOUNT_TCP;
825 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
826 mnt->timeo = 7;
827 mnt->retrans = 5;
828 break;
829 case Opt_tcp:
830 mnt->flags |= NFS_MOUNT_TCP;
831 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
832 mnt->timeo = 600;
833 mnt->retrans = 2;
834 break;
835 case Opt_rdma:
836 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
837 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
838 mnt->timeo = 600;
839 mnt->retrans = 2;
840 break;
841 case Opt_acl:
842 mnt->flags &= ~NFS_MOUNT_NOACL;
843 break;
844 case Opt_noacl:
845 mnt->flags |= NFS_MOUNT_NOACL;
846 break;
847 case Opt_rdirplus:
848 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
849 break;
850 case Opt_nordirplus:
851 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
852 break;
853 case Opt_sharecache:
854 mnt->flags &= ~NFS_MOUNT_UNSHARED;
855 break;
856 case Opt_nosharecache:
857 mnt->flags |= NFS_MOUNT_UNSHARED;
858 break;
859
860 case Opt_port:
861 if (match_int(args, &option))
862 return 0;
863 if (option < 0 || option > 65535)
864 return 0;
865 mnt->nfs_server.port = option;
866 break;
867 case Opt_rsize:
868 if (match_int(args, &mnt->rsize))
869 return 0;
870 break;
871 case Opt_wsize:
872 if (match_int(args, &mnt->wsize))
873 return 0;
874 break;
875 case Opt_bsize:
876 if (match_int(args, &option))
877 return 0;
878 if (option < 0)
879 return 0;
880 mnt->bsize = option;
881 break;
882 case Opt_timeo:
883 if (match_int(args, &mnt->timeo))
884 return 0;
885 break;
886 case Opt_retrans:
887 if (match_int(args, &mnt->retrans))
888 return 0;
889 break;
890 case Opt_acregmin:
891 if (match_int(args, &mnt->acregmin))
892 return 0;
893 break;
894 case Opt_acregmax:
895 if (match_int(args, &mnt->acregmax))
896 return 0;
897 break;
898 case Opt_acdirmin:
899 if (match_int(args, &mnt->acdirmin))
900 return 0;
901 break;
902 case Opt_acdirmax:
903 if (match_int(args, &mnt->acdirmax))
904 return 0;
905 break;
906 case Opt_actimeo:
907 if (match_int(args, &option))
908 return 0;
909 if (option < 0)
910 return 0;
911 mnt->acregmin =
912 mnt->acregmax =
913 mnt->acdirmin =
914 mnt->acdirmax = option;
915 break;
916 case Opt_namelen:
917 if (match_int(args, &mnt->namlen))
918 return 0;
919 break;
920 case Opt_mountport:
921 if (match_int(args, &option))
922 return 0;
923 if (option < 0 || option > 65535)
924 return 0;
925 mnt->mount_server.port = option;
926 break;
927 case Opt_mountvers:
928 if (match_int(args, &option))
929 return 0;
930 if (option < 0)
931 return 0;
932 mnt->mount_server.version = option;
933 break;
934 case Opt_nfsvers:
935 if (match_int(args, &option))
936 return 0;
937 switch (option) {
938 case 2:
939 mnt->flags &= ~NFS_MOUNT_VER3;
940 break;
941 case 3:
942 mnt->flags |= NFS_MOUNT_VER3;
943 break;
944 default:
945 goto out_unrec_vers;
946 }
947 break;
948
949 case Opt_sec:
950 string = match_strdup(args);
951 if (string == NULL)
952 goto out_nomem;
953 token = match_token(string, nfs_secflavor_tokens, args);
954 kfree(string);
955
956 /*
957 * The flags setting is for v2/v3. The flavor_len
958 * setting is for v4. v2/v3 also need to know the
959 * difference between NULL and UNIX.
960 */
961 switch (token) {
962 case Opt_sec_none:
963 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
964 mnt->auth_flavor_len = 0;
965 mnt->auth_flavors[0] = RPC_AUTH_NULL;
966 break;
967 case Opt_sec_sys:
968 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
969 mnt->auth_flavor_len = 0;
970 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
971 break;
972 case Opt_sec_krb5:
973 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
974 mnt->auth_flavor_len = 1;
975 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
976 break;
977 case Opt_sec_krb5i:
978 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
979 mnt->auth_flavor_len = 1;
980 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
981 break;
982 case Opt_sec_krb5p:
983 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
984 mnt->auth_flavor_len = 1;
985 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
986 break;
987 case Opt_sec_lkey:
988 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
989 mnt->auth_flavor_len = 1;
990 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
991 break;
992 case Opt_sec_lkeyi:
993 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
994 mnt->auth_flavor_len = 1;
995 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
996 break;
997 case Opt_sec_lkeyp:
998 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
999 mnt->auth_flavor_len = 1;
1000 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1001 break;
1002 case Opt_sec_spkm:
1003 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1004 mnt->auth_flavor_len = 1;
1005 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1006 break;
1007 case Opt_sec_spkmi:
1008 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1009 mnt->auth_flavor_len = 1;
1010 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1011 break;
1012 case Opt_sec_spkmp:
1013 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1014 mnt->auth_flavor_len = 1;
1015 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1016 break;
1017 default:
1018 goto out_unrec_sec;
1019 }
1020 break;
1021 case Opt_proto:
1022 string = match_strdup(args);
1023 if (string == NULL)
1024 goto out_nomem;
1025 token = match_token(string,
1026 nfs_xprt_protocol_tokens, args);
1027 kfree(string);
1028
1029 switch (token) {
1030 case Opt_xprt_udp:
1031 mnt->flags &= ~NFS_MOUNT_TCP;
1032 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1033 mnt->timeo = 7;
1034 mnt->retrans = 5;
1035 break;
1036 case Opt_xprt_tcp:
1037 mnt->flags |= NFS_MOUNT_TCP;
1038 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1039 mnt->timeo = 600;
1040 mnt->retrans = 2;
1041 break;
1042 case Opt_xprt_rdma:
1043 /* vector side protocols to TCP */
1044 mnt->flags |= NFS_MOUNT_TCP;
1045 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1046 mnt->timeo = 600;
1047 mnt->retrans = 2;
1048 break;
1049 default:
1050 goto out_unrec_xprt;
1051 }
1052 break;
1053 case Opt_mountproto:
1054 string = match_strdup(args);
1055 if (string == NULL)
1056 goto out_nomem;
1057 token = match_token(string,
1058 nfs_xprt_protocol_tokens, args);
1059 kfree(string);
1060
1061 switch (token) {
1062 case Opt_xprt_udp:
1063 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1064 break;
1065 case Opt_xprt_tcp:
1066 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1067 break;
1068 case Opt_xprt_rdma: /* not used for side protocols */
1069 default:
1070 goto out_unrec_xprt;
1071 }
1072 break;
1073 case Opt_addr:
1074 string = match_strdup(args);
1075 if (string == NULL)
1076 goto out_nomem;
1077 nfs_parse_server_address(string, (struct sockaddr *)
1078 &mnt->nfs_server.address,
1079 &mnt->nfs_server.addrlen);
1080 kfree(string);
1081 break;
1082 case Opt_clientaddr:
1083 string = match_strdup(args);
1084 if (string == NULL)
1085 goto out_nomem;
1086 kfree(mnt->client_address);
1087 mnt->client_address = string;
1088 break;
1089 case Opt_mounthost:
1090 string = match_strdup(args);
1091 if (string == NULL)
1092 goto out_nomem;
1093 kfree(mnt->mount_server.hostname);
1094 mnt->mount_server.hostname = string;
1095 break;
1096 case Opt_mountaddr:
1097 string = match_strdup(args);
1098 if (string == NULL)
1099 goto out_nomem;
1100 nfs_parse_server_address(string, (struct sockaddr *)
1101 &mnt->mount_server.address,
1102 &mnt->mount_server.addrlen);
1103 kfree(string);
1104 break;
1105
1106 case Opt_userspace:
1107 case Opt_deprecated:
1108 break;
1109
1110 default:
1111 goto out_unknown;
1112 }
1113 }
1114
1115 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1116 mnt->nfs_server.port);
1117
1118 return 1;
1119
1120 out_nomem:
1121 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1122 return 0;
1123 out_security_failure:
1124 free_secdata(secdata);
1125 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1126 return 0;
1127 out_unrec_vers:
1128 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1129 return 0;
1130
1131 out_unrec_xprt:
1132 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1133 return 0;
1134
1135 out_unrec_sec:
1136 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1137 return 0;
1138
1139 out_unknown:
1140 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1141 return 0;
1142 }
1143
1144 /*
1145 * Use the remote server's MOUNT service to request the NFS file handle
1146 * corresponding to the provided path.
1147 */
1148 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1149 struct nfs_fh *root_fh)
1150 {
1151 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1152 char *hostname;
1153 int status;
1154
1155 if (args->mount_server.version == 0) {
1156 if (args->flags & NFS_MOUNT_VER3)
1157 args->mount_server.version = NFS_MNT3_VERSION;
1158 else
1159 args->mount_server.version = NFS_MNT_VERSION;
1160 }
1161
1162 if (args->mount_server.hostname)
1163 hostname = args->mount_server.hostname;
1164 else
1165 hostname = args->nfs_server.hostname;
1166
1167 /*
1168 * Construct the mount server's address.
1169 */
1170 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1171 memcpy(sap, &args->nfs_server.address,
1172 args->nfs_server.addrlen);
1173 args->mount_server.addrlen = args->nfs_server.addrlen;
1174 }
1175
1176 /*
1177 * autobind will be used if mount_server.port == 0
1178 */
1179 nfs_set_port(sap, args->mount_server.port);
1180
1181 /*
1182 * Now ask the mount server to map our export path
1183 * to a file handle.
1184 */
1185 status = nfs_mount(sap,
1186 args->mount_server.addrlen,
1187 hostname,
1188 args->nfs_server.export_path,
1189 args->mount_server.version,
1190 args->mount_server.protocol,
1191 root_fh);
1192 if (status == 0)
1193 return 0;
1194
1195 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1196 hostname, status);
1197 return status;
1198 }
1199
1200 /*
1201 * Validate the NFS2/NFS3 mount data
1202 * - fills in the mount root filehandle
1203 *
1204 * For option strings, user space handles the following behaviors:
1205 *
1206 * + DNS: mapping server host name to IP address ("addr=" option)
1207 *
1208 * + failure mode: how to behave if a mount request can't be handled
1209 * immediately ("fg/bg" option)
1210 *
1211 * + retry: how often to retry a mount request ("retry=" option)
1212 *
1213 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1214 * mountproto=tcp after mountproto=udp, and so on
1215 */
1216 static int nfs_validate_mount_data(void *options,
1217 struct nfs_parsed_mount_data *args,
1218 struct nfs_fh *mntfh,
1219 const char *dev_name)
1220 {
1221 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1222
1223 if (data == NULL)
1224 goto out_no_data;
1225
1226 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1227 args->rsize = NFS_MAX_FILE_IO_SIZE;
1228 args->wsize = NFS_MAX_FILE_IO_SIZE;
1229 args->timeo = 600;
1230 args->retrans = 2;
1231 args->acregmin = 3;
1232 args->acregmax = 60;
1233 args->acdirmin = 30;
1234 args->acdirmax = 60;
1235 args->mount_server.port = 0; /* autobind unless user sets port */
1236 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1237 args->nfs_server.port = 0; /* autobind unless user sets port */
1238 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1239
1240 switch (data->version) {
1241 case 1:
1242 data->namlen = 0;
1243 case 2:
1244 data->bsize = 0;
1245 case 3:
1246 if (data->flags & NFS_MOUNT_VER3)
1247 goto out_no_v3;
1248 data->root.size = NFS2_FHSIZE;
1249 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1250 case 4:
1251 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1252 goto out_no_sec;
1253 case 5:
1254 memset(data->context, 0, sizeof(data->context));
1255 case 6:
1256 if (data->flags & NFS_MOUNT_VER3) {
1257 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1258 goto out_invalid_fh;
1259 mntfh->size = data->root.size;
1260 } else
1261 mntfh->size = NFS2_FHSIZE;
1262
1263
1264 memcpy(mntfh->data, data->root.data, mntfh->size);
1265 if (mntfh->size < sizeof(mntfh->data))
1266 memset(mntfh->data + mntfh->size, 0,
1267 sizeof(mntfh->data) - mntfh->size);
1268
1269 /*
1270 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1271 * can deal with.
1272 */
1273 args->flags = data->flags;
1274 args->rsize = data->rsize;
1275 args->wsize = data->wsize;
1276 args->timeo = data->timeo;
1277 args->retrans = data->retrans;
1278 args->acregmin = data->acregmin;
1279 args->acregmax = data->acregmax;
1280 args->acdirmin = data->acdirmin;
1281 args->acdirmax = data->acdirmax;
1282
1283 memcpy(&args->nfs_server.address, &data->addr,
1284 sizeof(data->addr));
1285 args->nfs_server.addrlen = sizeof(data->addr);
1286 if (!nfs_verify_server_address((struct sockaddr *)
1287 &args->nfs_server.address))
1288 goto out_no_address;
1289
1290 if (!(data->flags & NFS_MOUNT_TCP))
1291 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1292 /* N.B. caller will free nfs_server.hostname in all cases */
1293 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1294 args->namlen = data->namlen;
1295 args->bsize = data->bsize;
1296 args->auth_flavors[0] = data->pseudoflavor;
1297 if (!args->nfs_server.hostname)
1298 goto out_nomem;
1299
1300 /*
1301 * The legacy version 6 binary mount data from userspace has a
1302 * field used only to transport selinux information into the
1303 * the kernel. To continue to support that functionality we
1304 * have a touch of selinux knowledge here in the NFS code. The
1305 * userspace code converted context=blah to just blah so we are
1306 * converting back to the full string selinux understands.
1307 */
1308 if (data->context[0]){
1309 #ifdef CONFIG_SECURITY_SELINUX
1310 int rc;
1311 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1312 if (!opts_str)
1313 return -ENOMEM;
1314 strcpy(opts_str, "context=");
1315 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1316 strcat(opts_str, &data->context[0]);
1317 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1318 kfree(opts_str);
1319 if (rc)
1320 return rc;
1321 #else
1322 return -EINVAL;
1323 #endif
1324 }
1325
1326 break;
1327 default: {
1328 unsigned int len;
1329 char *c;
1330 int status;
1331
1332 if (nfs_parse_mount_options((char *)options, args) == 0)
1333 return -EINVAL;
1334
1335 if (!nfs_verify_server_address((struct sockaddr *)
1336 &args->nfs_server.address))
1337 goto out_no_address;
1338
1339 c = strchr(dev_name, ':');
1340 if (c == NULL)
1341 return -EINVAL;
1342 len = c - dev_name;
1343 /* N.B. caller will free nfs_server.hostname in all cases */
1344 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1345 if (!args->nfs_server.hostname)
1346 goto out_nomem;
1347
1348 c++;
1349 if (strlen(c) > NFS_MAXPATHLEN)
1350 return -ENAMETOOLONG;
1351 args->nfs_server.export_path = c;
1352
1353 status = nfs_try_mount(args, mntfh);
1354 if (status)
1355 return status;
1356
1357 break;
1358 }
1359 }
1360
1361 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1362 args->auth_flavors[0] = RPC_AUTH_UNIX;
1363
1364 #ifndef CONFIG_NFS_V3
1365 if (args->flags & NFS_MOUNT_VER3)
1366 goto out_v3_not_compiled;
1367 #endif /* !CONFIG_NFS_V3 */
1368
1369 return 0;
1370
1371 out_no_data:
1372 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1373 return -EINVAL;
1374
1375 out_no_v3:
1376 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1377 data->version);
1378 return -EINVAL;
1379
1380 out_no_sec:
1381 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1382 return -EINVAL;
1383
1384 #ifndef CONFIG_NFS_V3
1385 out_v3_not_compiled:
1386 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1387 return -EPROTONOSUPPORT;
1388 #endif /* !CONFIG_NFS_V3 */
1389
1390 out_nomem:
1391 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1392 return -ENOMEM;
1393
1394 out_no_address:
1395 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1396 return -EINVAL;
1397
1398 out_invalid_fh:
1399 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1400 return -EINVAL;
1401 }
1402
1403 static int
1404 nfs_compare_remount_data(struct nfs_server *nfss,
1405 struct nfs_parsed_mount_data *data)
1406 {
1407 if (data->flags != nfss->flags ||
1408 data->rsize != nfss->rsize ||
1409 data->wsize != nfss->wsize ||
1410 data->retrans != nfss->client->cl_timeout->to_retries ||
1411 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1412 data->acregmin != nfss->acregmin / HZ ||
1413 data->acregmax != nfss->acregmax / HZ ||
1414 data->acdirmin != nfss->acdirmin / HZ ||
1415 data->acdirmax != nfss->acdirmax / HZ ||
1416 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1417 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1418 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1419 data->nfs_server.addrlen) != 0)
1420 return -EINVAL;
1421
1422 return 0;
1423 }
1424
1425 static int
1426 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1427 {
1428 int error;
1429 struct nfs_server *nfss = sb->s_fs_info;
1430 struct nfs_parsed_mount_data *data;
1431 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1432 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1433
1434 /*
1435 * Userspace mount programs that send binary options generally send
1436 * them populated with default values. We have no way to know which
1437 * ones were explicitly specified. Fall back to legacy behavior and
1438 * just return success.
1439 */
1440 if ((sb->s_type == &nfs4_fs_type && options4->version == 1) ||
1441 (sb->s_type == &nfs_fs_type && options->version >= 1 &&
1442 options->version <= 6))
1443 return 0;
1444
1445 data = kzalloc(sizeof(*data), GFP_KERNEL);
1446 if (data == NULL)
1447 return -ENOMEM;
1448
1449 /* fill out struct with values from existing mount */
1450 data->flags = nfss->flags;
1451 data->rsize = nfss->rsize;
1452 data->wsize = nfss->wsize;
1453 data->retrans = nfss->client->cl_timeout->to_retries;
1454 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1455 data->acregmin = nfss->acregmin / HZ;
1456 data->acregmax = nfss->acregmax / HZ;
1457 data->acdirmin = nfss->acdirmin / HZ;
1458 data->acdirmax = nfss->acdirmax / HZ;
1459 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1460 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1461 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1462 data->nfs_server.addrlen);
1463
1464 /* overwrite those values with any that were specified */
1465 error = nfs_parse_mount_options((char *)options, data);
1466 if (error < 0)
1467 goto out;
1468
1469 /* compare new mount options with old ones */
1470 error = nfs_compare_remount_data(nfss, data);
1471 out:
1472 kfree(data);
1473 return error;
1474 }
1475
1476 /*
1477 * Initialise the common bits of the superblock
1478 */
1479 static inline void nfs_initialise_sb(struct super_block *sb)
1480 {
1481 struct nfs_server *server = NFS_SB(sb);
1482
1483 sb->s_magic = NFS_SUPER_MAGIC;
1484
1485 /* We probably want something more informative here */
1486 snprintf(sb->s_id, sizeof(sb->s_id),
1487 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1488
1489 if (sb->s_blocksize == 0)
1490 sb->s_blocksize = nfs_block_bits(server->wsize,
1491 &sb->s_blocksize_bits);
1492
1493 if (server->flags & NFS_MOUNT_NOAC)
1494 sb->s_flags |= MS_SYNCHRONOUS;
1495
1496 nfs_super_set_maxbytes(sb, server->maxfilesize);
1497 }
1498
1499 /*
1500 * Finish setting up an NFS2/3 superblock
1501 */
1502 static void nfs_fill_super(struct super_block *sb,
1503 struct nfs_parsed_mount_data *data)
1504 {
1505 struct nfs_server *server = NFS_SB(sb);
1506
1507 sb->s_blocksize_bits = 0;
1508 sb->s_blocksize = 0;
1509 if (data->bsize)
1510 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1511
1512 if (server->flags & NFS_MOUNT_VER3) {
1513 /* The VFS shouldn't apply the umask to mode bits. We will do
1514 * so ourselves when necessary.
1515 */
1516 sb->s_flags |= MS_POSIXACL;
1517 sb->s_time_gran = 1;
1518 }
1519
1520 sb->s_op = &nfs_sops;
1521 nfs_initialise_sb(sb);
1522 }
1523
1524 /*
1525 * Finish setting up a cloned NFS2/3 superblock
1526 */
1527 static void nfs_clone_super(struct super_block *sb,
1528 const struct super_block *old_sb)
1529 {
1530 struct nfs_server *server = NFS_SB(sb);
1531
1532 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1533 sb->s_blocksize = old_sb->s_blocksize;
1534 sb->s_maxbytes = old_sb->s_maxbytes;
1535
1536 if (server->flags & NFS_MOUNT_VER3) {
1537 /* The VFS shouldn't apply the umask to mode bits. We will do
1538 * so ourselves when necessary.
1539 */
1540 sb->s_flags |= MS_POSIXACL;
1541 sb->s_time_gran = 1;
1542 }
1543
1544 sb->s_op = old_sb->s_op;
1545 nfs_initialise_sb(sb);
1546 }
1547
1548 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1549
1550 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1551 {
1552 const struct nfs_server *a = s->s_fs_info;
1553 const struct rpc_clnt *clnt_a = a->client;
1554 const struct rpc_clnt *clnt_b = b->client;
1555
1556 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1557 goto Ebusy;
1558 if (a->nfs_client != b->nfs_client)
1559 goto Ebusy;
1560 if (a->flags != b->flags)
1561 goto Ebusy;
1562 if (a->wsize != b->wsize)
1563 goto Ebusy;
1564 if (a->rsize != b->rsize)
1565 goto Ebusy;
1566 if (a->acregmin != b->acregmin)
1567 goto Ebusy;
1568 if (a->acregmax != b->acregmax)
1569 goto Ebusy;
1570 if (a->acdirmin != b->acdirmin)
1571 goto Ebusy;
1572 if (a->acdirmax != b->acdirmax)
1573 goto Ebusy;
1574 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1575 goto Ebusy;
1576 return 1;
1577 Ebusy:
1578 return 0;
1579 }
1580
1581 struct nfs_sb_mountdata {
1582 struct nfs_server *server;
1583 int mntflags;
1584 };
1585
1586 static int nfs_set_super(struct super_block *s, void *data)
1587 {
1588 struct nfs_sb_mountdata *sb_mntdata = data;
1589 struct nfs_server *server = sb_mntdata->server;
1590 int ret;
1591
1592 s->s_flags = sb_mntdata->mntflags;
1593 s->s_fs_info = server;
1594 ret = set_anon_super(s, server);
1595 if (ret == 0)
1596 server->s_dev = s->s_dev;
1597 return ret;
1598 }
1599
1600 static int nfs_compare_super_address(struct nfs_server *server1,
1601 struct nfs_server *server2)
1602 {
1603 struct sockaddr *sap1, *sap2;
1604
1605 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1606 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1607
1608 if (sap1->sa_family != sap2->sa_family)
1609 return 0;
1610
1611 switch (sap1->sa_family) {
1612 case AF_INET: {
1613 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1614 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1615 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1616 return 0;
1617 if (sin1->sin_port != sin2->sin_port)
1618 return 0;
1619 break;
1620 }
1621 case AF_INET6: {
1622 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1623 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1624 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1625 return 0;
1626 if (sin1->sin6_port != sin2->sin6_port)
1627 return 0;
1628 break;
1629 }
1630 default:
1631 return 0;
1632 }
1633
1634 return 1;
1635 }
1636
1637 static int nfs_compare_super(struct super_block *sb, void *data)
1638 {
1639 struct nfs_sb_mountdata *sb_mntdata = data;
1640 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1641 int mntflags = sb_mntdata->mntflags;
1642
1643 if (!nfs_compare_super_address(old, server))
1644 return 0;
1645 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1646 if (old->flags & NFS_MOUNT_UNSHARED)
1647 return 0;
1648 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1649 return 0;
1650 return nfs_compare_mount_options(sb, server, mntflags);
1651 }
1652
1653 static int nfs_bdi_register(struct nfs_server *server)
1654 {
1655 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1656 }
1657
1658 static int nfs_get_sb(struct file_system_type *fs_type,
1659 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1660 {
1661 struct nfs_server *server = NULL;
1662 struct super_block *s;
1663 struct nfs_parsed_mount_data *data;
1664 struct nfs_fh *mntfh;
1665 struct dentry *mntroot;
1666 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1667 struct nfs_sb_mountdata sb_mntdata = {
1668 .mntflags = flags,
1669 };
1670 int error = -ENOMEM;
1671
1672 data = kzalloc(sizeof(*data), GFP_KERNEL);
1673 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1674 if (data == NULL || mntfh == NULL)
1675 goto out_free_fh;
1676
1677 security_init_mnt_opts(&data->lsm_opts);
1678
1679 /* Validate the mount data */
1680 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1681 if (error < 0)
1682 goto out;
1683
1684 /* Get a volume representation */
1685 server = nfs_create_server(data, mntfh);
1686 if (IS_ERR(server)) {
1687 error = PTR_ERR(server);
1688 goto out;
1689 }
1690 sb_mntdata.server = server;
1691
1692 if (server->flags & NFS_MOUNT_UNSHARED)
1693 compare_super = NULL;
1694
1695 /* Get a superblock - note that we may end up sharing one that already exists */
1696 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1697 if (IS_ERR(s)) {
1698 error = PTR_ERR(s);
1699 goto out_err_nosb;
1700 }
1701
1702 if (s->s_fs_info != server) {
1703 nfs_free_server(server);
1704 server = NULL;
1705 } else {
1706 error = nfs_bdi_register(server);
1707 if (error)
1708 goto error_splat_super;
1709 }
1710
1711 if (!s->s_root) {
1712 /* initial superblock/root creation */
1713 nfs_fill_super(s, data);
1714 }
1715
1716 mntroot = nfs_get_root(s, mntfh);
1717 if (IS_ERR(mntroot)) {
1718 error = PTR_ERR(mntroot);
1719 goto error_splat_super;
1720 }
1721
1722 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1723 if (error)
1724 goto error_splat_root;
1725
1726 s->s_flags |= MS_ACTIVE;
1727 mnt->mnt_sb = s;
1728 mnt->mnt_root = mntroot;
1729 error = 0;
1730
1731 out:
1732 kfree(data->nfs_server.hostname);
1733 kfree(data->mount_server.hostname);
1734 security_free_mnt_opts(&data->lsm_opts);
1735 out_free_fh:
1736 kfree(mntfh);
1737 kfree(data);
1738 return error;
1739
1740 out_err_nosb:
1741 nfs_free_server(server);
1742 goto out;
1743
1744 error_splat_root:
1745 dput(mntroot);
1746 error_splat_super:
1747 up_write(&s->s_umount);
1748 deactivate_super(s);
1749 goto out;
1750 }
1751
1752 /*
1753 * Destroy an NFS2/3 superblock
1754 */
1755 static void nfs_kill_super(struct super_block *s)
1756 {
1757 struct nfs_server *server = NFS_SB(s);
1758
1759 bdi_unregister(&server->backing_dev_info);
1760 kill_anon_super(s);
1761 nfs_free_server(server);
1762 }
1763
1764 /*
1765 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1766 */
1767 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1768 const char *dev_name, void *raw_data,
1769 struct vfsmount *mnt)
1770 {
1771 struct nfs_clone_mount *data = raw_data;
1772 struct super_block *s;
1773 struct nfs_server *server;
1774 struct dentry *mntroot;
1775 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1776 struct nfs_sb_mountdata sb_mntdata = {
1777 .mntflags = flags,
1778 };
1779 int error;
1780
1781 dprintk("--> nfs_xdev_get_sb()\n");
1782
1783 /* create a new volume representation */
1784 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1785 if (IS_ERR(server)) {
1786 error = PTR_ERR(server);
1787 goto out_err_noserver;
1788 }
1789 sb_mntdata.server = server;
1790
1791 if (server->flags & NFS_MOUNT_UNSHARED)
1792 compare_super = NULL;
1793
1794 /* Get a superblock - note that we may end up sharing one that already exists */
1795 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1796 if (IS_ERR(s)) {
1797 error = PTR_ERR(s);
1798 goto out_err_nosb;
1799 }
1800
1801 if (s->s_fs_info != server) {
1802 nfs_free_server(server);
1803 server = NULL;
1804 } else {
1805 error = nfs_bdi_register(server);
1806 if (error)
1807 goto error_splat_super;
1808 }
1809
1810 if (!s->s_root) {
1811 /* initial superblock/root creation */
1812 nfs_clone_super(s, data->sb);
1813 }
1814
1815 mntroot = nfs_get_root(s, data->fh);
1816 if (IS_ERR(mntroot)) {
1817 error = PTR_ERR(mntroot);
1818 goto error_splat_super;
1819 }
1820 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1821 dput(mntroot);
1822 error = -ESTALE;
1823 goto error_splat_super;
1824 }
1825
1826 s->s_flags |= MS_ACTIVE;
1827 mnt->mnt_sb = s;
1828 mnt->mnt_root = mntroot;
1829
1830 /* clone any lsm security options from the parent to the new sb */
1831 security_sb_clone_mnt_opts(data->sb, s);
1832
1833 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1834 return 0;
1835
1836 out_err_nosb:
1837 nfs_free_server(server);
1838 out_err_noserver:
1839 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1840 return error;
1841
1842 error_splat_super:
1843 up_write(&s->s_umount);
1844 deactivate_super(s);
1845 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1846 return error;
1847 }
1848
1849 #ifdef CONFIG_NFS_V4
1850
1851 /*
1852 * Finish setting up a cloned NFS4 superblock
1853 */
1854 static void nfs4_clone_super(struct super_block *sb,
1855 const struct super_block *old_sb)
1856 {
1857 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1858 sb->s_blocksize = old_sb->s_blocksize;
1859 sb->s_maxbytes = old_sb->s_maxbytes;
1860 sb->s_time_gran = 1;
1861 sb->s_op = old_sb->s_op;
1862 nfs_initialise_sb(sb);
1863 }
1864
1865 /*
1866 * Set up an NFS4 superblock
1867 */
1868 static void nfs4_fill_super(struct super_block *sb)
1869 {
1870 sb->s_time_gran = 1;
1871 sb->s_op = &nfs4_sops;
1872 nfs_initialise_sb(sb);
1873 }
1874
1875 /*
1876 * Validate NFSv4 mount options
1877 */
1878 static int nfs4_validate_mount_data(void *options,
1879 struct nfs_parsed_mount_data *args,
1880 const char *dev_name)
1881 {
1882 struct sockaddr_in *ap;
1883 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1884 char *c;
1885
1886 if (data == NULL)
1887 goto out_no_data;
1888
1889 args->rsize = NFS_MAX_FILE_IO_SIZE;
1890 args->wsize = NFS_MAX_FILE_IO_SIZE;
1891 args->timeo = 600;
1892 args->retrans = 2;
1893 args->acregmin = 3;
1894 args->acregmax = 60;
1895 args->acdirmin = 30;
1896 args->acdirmax = 60;
1897 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
1898 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1899
1900 switch (data->version) {
1901 case 1:
1902 ap = (struct sockaddr_in *)&args->nfs_server.address;
1903 if (data->host_addrlen > sizeof(args->nfs_server.address))
1904 goto out_no_address;
1905 if (data->host_addrlen == 0)
1906 goto out_no_address;
1907 args->nfs_server.addrlen = data->host_addrlen;
1908 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1909 return -EFAULT;
1910 if (!nfs_verify_server_address((struct sockaddr *)
1911 &args->nfs_server.address))
1912 goto out_no_address;
1913
1914 switch (data->auth_flavourlen) {
1915 case 0:
1916 args->auth_flavors[0] = RPC_AUTH_UNIX;
1917 break;
1918 case 1:
1919 if (copy_from_user(&args->auth_flavors[0],
1920 data->auth_flavours,
1921 sizeof(args->auth_flavors[0])))
1922 return -EFAULT;
1923 break;
1924 default:
1925 goto out_inval_auth;
1926 }
1927
1928 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1929 if (IS_ERR(c))
1930 return PTR_ERR(c);
1931 args->nfs_server.hostname = c;
1932
1933 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1934 if (IS_ERR(c))
1935 return PTR_ERR(c);
1936 args->nfs_server.export_path = c;
1937 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1938
1939 c = strndup_user(data->client_addr.data, 16);
1940 if (IS_ERR(c))
1941 return PTR_ERR(c);
1942 args->client_address = c;
1943
1944 /*
1945 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1946 * can deal with.
1947 */
1948
1949 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1950 args->rsize = data->rsize;
1951 args->wsize = data->wsize;
1952 args->timeo = data->timeo;
1953 args->retrans = data->retrans;
1954 args->acregmin = data->acregmin;
1955 args->acregmax = data->acregmax;
1956 args->acdirmin = data->acdirmin;
1957 args->acdirmax = data->acdirmax;
1958 args->nfs_server.protocol = data->proto;
1959
1960 break;
1961 default: {
1962 unsigned int len;
1963
1964 if (nfs_parse_mount_options((char *)options, args) == 0)
1965 return -EINVAL;
1966
1967 if (!nfs_verify_server_address((struct sockaddr *)
1968 &args->nfs_server.address))
1969 return -EINVAL;
1970
1971 switch (args->auth_flavor_len) {
1972 case 0:
1973 args->auth_flavors[0] = RPC_AUTH_UNIX;
1974 break;
1975 case 1:
1976 break;
1977 default:
1978 goto out_inval_auth;
1979 }
1980
1981 /*
1982 * Split "dev_name" into "hostname:mntpath".
1983 */
1984 c = strchr(dev_name, ':');
1985 if (c == NULL)
1986 return -EINVAL;
1987 /* while calculating len, pretend ':' is '\0' */
1988 len = c - dev_name;
1989 if (len > NFS4_MAXNAMLEN)
1990 return -ENAMETOOLONG;
1991 /* N.B. caller will free nfs_server.hostname in all cases */
1992 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1993 if (!args->nfs_server.hostname)
1994 goto out_nomem;
1995
1996 c++; /* step over the ':' */
1997 len = strlen(c);
1998 if (len > NFS4_MAXPATHLEN)
1999 return -ENAMETOOLONG;
2000 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
2001 if (!args->nfs_server.export_path)
2002 goto out_nomem;
2003
2004 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
2005
2006 if (args->client_address == NULL)
2007 goto out_no_client_address;
2008
2009 break;
2010 }
2011 }
2012
2013 return 0;
2014
2015 out_no_data:
2016 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2017 return -EINVAL;
2018
2019 out_inval_auth:
2020 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2021 data->auth_flavourlen);
2022 return -EINVAL;
2023
2024 out_nomem:
2025 dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
2026 return -ENOMEM;
2027
2028 out_no_address:
2029 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2030 return -EINVAL;
2031
2032 out_no_client_address:
2033 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2034 return -EINVAL;
2035 }
2036
2037 /*
2038 * Get the superblock for an NFS4 mountpoint
2039 */
2040 static int nfs4_get_sb(struct file_system_type *fs_type,
2041 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2042 {
2043 struct nfs_parsed_mount_data *data;
2044 struct super_block *s;
2045 struct nfs_server *server;
2046 struct nfs_fh *mntfh;
2047 struct dentry *mntroot;
2048 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2049 struct nfs_sb_mountdata sb_mntdata = {
2050 .mntflags = flags,
2051 };
2052 int error = -ENOMEM;
2053
2054 data = kzalloc(sizeof(*data), GFP_KERNEL);
2055 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2056 if (data == NULL || mntfh == NULL)
2057 goto out_free_fh;
2058
2059 security_init_mnt_opts(&data->lsm_opts);
2060
2061 /* Validate the mount data */
2062 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2063 if (error < 0)
2064 goto out;
2065
2066 /* Get a volume representation */
2067 server = nfs4_create_server(data, mntfh);
2068 if (IS_ERR(server)) {
2069 error = PTR_ERR(server);
2070 goto out;
2071 }
2072 sb_mntdata.server = server;
2073
2074 if (server->flags & NFS4_MOUNT_UNSHARED)
2075 compare_super = NULL;
2076
2077 /* Get a superblock - note that we may end up sharing one that already exists */
2078 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2079 if (IS_ERR(s)) {
2080 error = PTR_ERR(s);
2081 goto out_free;
2082 }
2083
2084 if (s->s_fs_info != server) {
2085 nfs_free_server(server);
2086 server = NULL;
2087 } else {
2088 error = nfs_bdi_register(server);
2089 if (error)
2090 goto error_splat_super;
2091 }
2092
2093 if (!s->s_root) {
2094 /* initial superblock/root creation */
2095 nfs4_fill_super(s);
2096 }
2097
2098 mntroot = nfs4_get_root(s, mntfh);
2099 if (IS_ERR(mntroot)) {
2100 error = PTR_ERR(mntroot);
2101 goto error_splat_super;
2102 }
2103
2104 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2105 if (error)
2106 goto error_splat_root;
2107
2108 s->s_flags |= MS_ACTIVE;
2109 mnt->mnt_sb = s;
2110 mnt->mnt_root = mntroot;
2111 error = 0;
2112
2113 out:
2114 kfree(data->client_address);
2115 kfree(data->nfs_server.export_path);
2116 kfree(data->nfs_server.hostname);
2117 security_free_mnt_opts(&data->lsm_opts);
2118 out_free_fh:
2119 kfree(mntfh);
2120 kfree(data);
2121 return error;
2122
2123 out_free:
2124 nfs_free_server(server);
2125 goto out;
2126
2127 error_splat_root:
2128 dput(mntroot);
2129 error_splat_super:
2130 up_write(&s->s_umount);
2131 deactivate_super(s);
2132 goto out;
2133 }
2134
2135 static void nfs4_kill_super(struct super_block *sb)
2136 {
2137 struct nfs_server *server = NFS_SB(sb);
2138
2139 nfs_return_all_delegations(sb);
2140 kill_anon_super(sb);
2141
2142 nfs4_renewd_prepare_shutdown(server);
2143 nfs_free_server(server);
2144 }
2145
2146 /*
2147 * Clone an NFS4 server record on xdev traversal (FSID-change)
2148 */
2149 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2150 const char *dev_name, void *raw_data,
2151 struct vfsmount *mnt)
2152 {
2153 struct nfs_clone_mount *data = raw_data;
2154 struct super_block *s;
2155 struct nfs_server *server;
2156 struct dentry *mntroot;
2157 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2158 struct nfs_sb_mountdata sb_mntdata = {
2159 .mntflags = flags,
2160 };
2161 int error;
2162
2163 dprintk("--> nfs4_xdev_get_sb()\n");
2164
2165 /* create a new volume representation */
2166 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2167 if (IS_ERR(server)) {
2168 error = PTR_ERR(server);
2169 goto out_err_noserver;
2170 }
2171 sb_mntdata.server = server;
2172
2173 if (server->flags & NFS4_MOUNT_UNSHARED)
2174 compare_super = NULL;
2175
2176 /* Get a superblock - note that we may end up sharing one that already exists */
2177 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2178 if (IS_ERR(s)) {
2179 error = PTR_ERR(s);
2180 goto out_err_nosb;
2181 }
2182
2183 if (s->s_fs_info != server) {
2184 nfs_free_server(server);
2185 server = NULL;
2186 } else {
2187 error = nfs_bdi_register(server);
2188 if (error)
2189 goto error_splat_super;
2190 }
2191
2192 if (!s->s_root) {
2193 /* initial superblock/root creation */
2194 nfs4_clone_super(s, data->sb);
2195 }
2196
2197 mntroot = nfs4_get_root(s, data->fh);
2198 if (IS_ERR(mntroot)) {
2199 error = PTR_ERR(mntroot);
2200 goto error_splat_super;
2201 }
2202 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2203 dput(mntroot);
2204 error = -ESTALE;
2205 goto error_splat_super;
2206 }
2207
2208 s->s_flags |= MS_ACTIVE;
2209 mnt->mnt_sb = s;
2210 mnt->mnt_root = mntroot;
2211
2212 security_sb_clone_mnt_opts(data->sb, s);
2213
2214 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2215 return 0;
2216
2217 out_err_nosb:
2218 nfs_free_server(server);
2219 out_err_noserver:
2220 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2221 return error;
2222
2223 error_splat_super:
2224 up_write(&s->s_umount);
2225 deactivate_super(s);
2226 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2227 return error;
2228 }
2229
2230 /*
2231 * Create an NFS4 server record on referral traversal
2232 */
2233 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2234 const char *dev_name, void *raw_data,
2235 struct vfsmount *mnt)
2236 {
2237 struct nfs_clone_mount *data = raw_data;
2238 struct super_block *s;
2239 struct nfs_server *server;
2240 struct dentry *mntroot;
2241 struct nfs_fh mntfh;
2242 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2243 struct nfs_sb_mountdata sb_mntdata = {
2244 .mntflags = flags,
2245 };
2246 int error;
2247
2248 dprintk("--> nfs4_referral_get_sb()\n");
2249
2250 /* create a new volume representation */
2251 server = nfs4_create_referral_server(data, &mntfh);
2252 if (IS_ERR(server)) {
2253 error = PTR_ERR(server);
2254 goto out_err_noserver;
2255 }
2256 sb_mntdata.server = server;
2257
2258 if (server->flags & NFS4_MOUNT_UNSHARED)
2259 compare_super = NULL;
2260
2261 /* Get a superblock - note that we may end up sharing one that already exists */
2262 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2263 if (IS_ERR(s)) {
2264 error = PTR_ERR(s);
2265 goto out_err_nosb;
2266 }
2267
2268 if (s->s_fs_info != server) {
2269 nfs_free_server(server);
2270 server = NULL;
2271 } else {
2272 error = nfs_bdi_register(server);
2273 if (error)
2274 goto error_splat_super;
2275 }
2276
2277 if (!s->s_root) {
2278 /* initial superblock/root creation */
2279 nfs4_fill_super(s);
2280 }
2281
2282 mntroot = nfs4_get_root(s, &mntfh);
2283 if (IS_ERR(mntroot)) {
2284 error = PTR_ERR(mntroot);
2285 goto error_splat_super;
2286 }
2287 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2288 dput(mntroot);
2289 error = -ESTALE;
2290 goto error_splat_super;
2291 }
2292
2293 s->s_flags |= MS_ACTIVE;
2294 mnt->mnt_sb = s;
2295 mnt->mnt_root = mntroot;
2296
2297 security_sb_clone_mnt_opts(data->sb, s);
2298
2299 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2300 return 0;
2301
2302 out_err_nosb:
2303 nfs_free_server(server);
2304 out_err_noserver:
2305 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2306 return error;
2307
2308 error_splat_super:
2309 up_write(&s->s_umount);
2310 deactivate_super(s);
2311 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2312 return error;
2313 }
2314
2315 #endif /* CONFIG_NFS_V4 */
Linux 2.6 libata-dev (mirror)