a1065c1a3149e41e146372e8b5ce0de6c4bdc5e6
[linux-2.6.git] / fs / nfs / super.c
1 /*
2  *  linux/fs/nfs/super.c
3  *
4  *  Copyright (C) 1992  Rick Sladkey
5  *
6  *  nfs superblock handling functions
7  *
8  *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
10  *
11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12  *  J.S.Peatfield@damtp.cam.ac.uk
13  *
14  *  Split from inode.c by David Howells <dhowells@redhat.com>
15  *
16  * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17  *   particular server are held in the same superblock
18  * - NFS superblocks can have several effective roots to the dentry tree
19  * - directory type roots are spliced into the tree when a path from one root reaches the root
20  *   of another (see nfs_lookup())
21  */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25
26 #include <linux/time.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <net/ipv6.h>
50 #include <linux/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
53
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
56
57 #include "nfs4_fs.h"
58 #include "callback.h"
59 #include "delegation.h"
60 #include "iostat.h"
61 #include "internal.h"
62
63 #define NFSDBG_FACILITY         NFSDBG_VFS
64
65 enum {
66         /* Mount options that take no arguments */
67         Opt_soft, Opt_hard,
68         Opt_posix, Opt_noposix,
69         Opt_cto, Opt_nocto,
70         Opt_ac, Opt_noac,
71         Opt_lock, Opt_nolock,
72         Opt_v2, Opt_v3,
73         Opt_udp, Opt_tcp, Opt_rdma,
74         Opt_acl, Opt_noacl,
75         Opt_rdirplus, Opt_nordirplus,
76         Opt_sharecache, Opt_nosharecache,
77
78         /* Mount options that take integer arguments */
79         Opt_port,
80         Opt_rsize, Opt_wsize, Opt_bsize,
81         Opt_timeo, Opt_retrans,
82         Opt_acregmin, Opt_acregmax,
83         Opt_acdirmin, Opt_acdirmax,
84         Opt_actimeo,
85         Opt_namelen,
86         Opt_mountport,
87         Opt_mountvers,
88         Opt_nfsvers,
89
90         /* Mount options that take string arguments */
91         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
92         Opt_addr, Opt_mountaddr, Opt_clientaddr,
93
94         /* Mount options that are ignored */
95         Opt_userspace, Opt_deprecated,
96
97         Opt_err
98 };
99
100 static match_table_t nfs_mount_option_tokens = {
101         { Opt_userspace, "bg" },
102         { Opt_userspace, "fg" },
103         { Opt_userspace, "retry=%s" },
104
105         { Opt_soft, "soft" },
106         { Opt_hard, "hard" },
107         { Opt_deprecated, "intr" },
108         { Opt_deprecated, "nointr" },
109         { Opt_posix, "posix" },
110         { Opt_noposix, "noposix" },
111         { Opt_cto, "cto" },
112         { Opt_nocto, "nocto" },
113         { Opt_ac, "ac" },
114         { Opt_noac, "noac" },
115         { Opt_lock, "lock" },
116         { Opt_nolock, "nolock" },
117         { Opt_v2, "v2" },
118         { Opt_v3, "v3" },
119         { Opt_udp, "udp" },
120         { Opt_tcp, "tcp" },
121         { Opt_rdma, "rdma" },
122         { Opt_acl, "acl" },
123         { Opt_noacl, "noacl" },
124         { Opt_rdirplus, "rdirplus" },
125         { Opt_nordirplus, "nordirplus" },
126         { Opt_sharecache, "sharecache" },
127         { Opt_nosharecache, "nosharecache" },
128
129         { Opt_port, "port=%u" },
130         { Opt_rsize, "rsize=%u" },
131         { Opt_wsize, "wsize=%u" },
132         { Opt_bsize, "bsize=%u" },
133         { Opt_timeo, "timeo=%u" },
134         { Opt_retrans, "retrans=%u" },
135         { Opt_acregmin, "acregmin=%u" },
136         { Opt_acregmax, "acregmax=%u" },
137         { Opt_acdirmin, "acdirmin=%u" },
138         { Opt_acdirmax, "acdirmax=%u" },
139         { Opt_actimeo, "actimeo=%u" },
140         { Opt_namelen, "namlen=%u" },
141         { Opt_mountport, "mountport=%u" },
142         { Opt_mountvers, "mountvers=%u" },
143         { Opt_nfsvers, "nfsvers=%u" },
144         { Opt_nfsvers, "vers=%u" },
145
146         { Opt_sec, "sec=%s" },
147         { Opt_proto, "proto=%s" },
148         { Opt_mountproto, "mountproto=%s" },
149         { Opt_addr, "addr=%s" },
150         { Opt_clientaddr, "clientaddr=%s" },
151         { Opt_mounthost, "mounthost=%s" },
152         { Opt_mountaddr, "mountaddr=%s" },
153
154         { Opt_err, NULL }
155 };
156
157 enum {
158         Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
159
160         Opt_xprt_err
161 };
162
163 static match_table_t nfs_xprt_protocol_tokens = {
164         { Opt_xprt_udp, "udp" },
165         { Opt_xprt_tcp, "tcp" },
166         { Opt_xprt_rdma, "rdma" },
167
168         { Opt_xprt_err, NULL }
169 };
170
171 enum {
172         Opt_sec_none, Opt_sec_sys,
173         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
176
177         Opt_sec_err
178 };
179
180 static match_table_t nfs_secflavor_tokens = {
181         { Opt_sec_none, "none" },
182         { Opt_sec_none, "null" },
183         { Opt_sec_sys, "sys" },
184
185         { Opt_sec_krb5, "krb5" },
186         { Opt_sec_krb5i, "krb5i" },
187         { Opt_sec_krb5p, "krb5p" },
188
189         { Opt_sec_lkey, "lkey" },
190         { Opt_sec_lkeyi, "lkeyi" },
191         { Opt_sec_lkeyp, "lkeyp" },
192
193         { Opt_sec_spkm, "spkm3" },
194         { Opt_sec_spkmi, "spkm3i" },
195         { Opt_sec_spkmp, "spkm3p" },
196
197         { Opt_sec_err, NULL }
198 };
199
200
201 static void nfs_umount_begin(struct super_block *);
202 static int  nfs_statfs(struct dentry *, struct kstatfs *);
203 static int  nfs_show_options(struct seq_file *, struct vfsmount *);
204 static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
207                 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
208 static void nfs_kill_super(struct super_block *);
209 static void nfs_put_super(struct super_block *);
210 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
211
212 static struct file_system_type nfs_fs_type = {
213         .owner          = THIS_MODULE,
214         .name           = "nfs",
215         .get_sb         = nfs_get_sb,
216         .kill_sb        = nfs_kill_super,
217         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
218 };
219
220 struct file_system_type nfs_xdev_fs_type = {
221         .owner          = THIS_MODULE,
222         .name           = "nfs",
223         .get_sb         = nfs_xdev_get_sb,
224         .kill_sb        = nfs_kill_super,
225         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
226 };
227
228 static const struct super_operations nfs_sops = {
229         .alloc_inode    = nfs_alloc_inode,
230         .destroy_inode  = nfs_destroy_inode,
231         .write_inode    = nfs_write_inode,
232         .put_super      = nfs_put_super,
233         .statfs         = nfs_statfs,
234         .clear_inode    = nfs_clear_inode,
235         .umount_begin   = nfs_umount_begin,
236         .show_options   = nfs_show_options,
237         .show_stats     = nfs_show_stats,
238         .remount_fs     = nfs_remount,
239 };
240
241 #ifdef CONFIG_NFS_V4
242 static int nfs4_get_sb(struct file_system_type *fs_type,
243         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
245         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
247         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
248 static void nfs4_kill_super(struct super_block *sb);
249
250 static struct file_system_type nfs4_fs_type = {
251         .owner          = THIS_MODULE,
252         .name           = "nfs4",
253         .get_sb         = nfs4_get_sb,
254         .kill_sb        = nfs4_kill_super,
255         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
256 };
257
258 struct file_system_type nfs4_xdev_fs_type = {
259         .owner          = THIS_MODULE,
260         .name           = "nfs4",
261         .get_sb         = nfs4_xdev_get_sb,
262         .kill_sb        = nfs4_kill_super,
263         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
264 };
265
266 struct file_system_type nfs4_referral_fs_type = {
267         .owner          = THIS_MODULE,
268         .name           = "nfs4",
269         .get_sb         = nfs4_referral_get_sb,
270         .kill_sb        = nfs4_kill_super,
271         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
272 };
273
274 static const struct super_operations nfs4_sops = {
275         .alloc_inode    = nfs_alloc_inode,
276         .destroy_inode  = nfs_destroy_inode,
277         .write_inode    = nfs_write_inode,
278         .statfs         = nfs_statfs,
279         .clear_inode    = nfs4_clear_inode,
280         .umount_begin   = nfs_umount_begin,
281         .show_options   = nfs_show_options,
282         .show_stats     = nfs_show_stats,
283         .remount_fs     = nfs_remount,
284 };
285 #endif
286
287 static struct shrinker acl_shrinker = {
288         .shrink         = nfs_access_cache_shrinker,
289         .seeks          = DEFAULT_SEEKS,
290 };
291
292 /*
293  * Register the NFS filesystems
294  */
295 int __init register_nfs_fs(void)
296 {
297         int ret;
298
299         ret = register_filesystem(&nfs_fs_type);
300         if (ret < 0)
301                 goto error_0;
302
303         ret = nfs_register_sysctl();
304         if (ret < 0)
305                 goto error_1;
306 #ifdef CONFIG_NFS_V4
307         ret = register_filesystem(&nfs4_fs_type);
308         if (ret < 0)
309                 goto error_2;
310 #endif
311         register_shrinker(&acl_shrinker);
312         return 0;
313
314 #ifdef CONFIG_NFS_V4
315 error_2:
316         nfs_unregister_sysctl();
317 #endif
318 error_1:
319         unregister_filesystem(&nfs_fs_type);
320 error_0:
321         return ret;
322 }
323
324 /*
325  * Unregister the NFS filesystems
326  */
327 void __exit unregister_nfs_fs(void)
328 {
329         unregister_shrinker(&acl_shrinker);
330 #ifdef CONFIG_NFS_V4
331         unregister_filesystem(&nfs4_fs_type);
332 #endif
333         nfs_unregister_sysctl();
334         unregister_filesystem(&nfs_fs_type);
335 }
336
337 void nfs_sb_active(struct nfs_server *server)
338 {
339         atomic_inc(&server->active);
340 }
341
342 void nfs_sb_deactive(struct nfs_server *server)
343 {
344         if (atomic_dec_and_test(&server->active))
345                 wake_up(&server->active_wq);
346 }
347
348 static void nfs_put_super(struct super_block *sb)
349 {
350         struct nfs_server *server = NFS_SB(sb);
351         /*
352          * Make sure there are no outstanding ops to this server.
353          * If so, wait for them to finish before allowing the
354          * unmount to continue.
355          */
356         wait_event(server->active_wq, atomic_read(&server->active) == 0);
357 }
358
359 /*
360  * Deliver file system statistics to userspace
361  */
362 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
363 {
364         struct nfs_server *server = NFS_SB(dentry->d_sb);
365         unsigned char blockbits;
366         unsigned long blockres;
367         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
368         struct nfs_fattr fattr;
369         struct nfs_fsstat res = {
370                         .fattr = &fattr,
371         };
372         int error;
373
374         lock_kernel();
375
376         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
377         if (error < 0)
378                 goto out_err;
379         buf->f_type = NFS_SUPER_MAGIC;
380
381         /*
382          * Current versions of glibc do not correctly handle the
383          * case where f_frsize != f_bsize.  Eventually we want to
384          * report the value of wtmult in this field.
385          */
386         buf->f_frsize = dentry->d_sb->s_blocksize;
387
388         /*
389          * On most *nix systems, f_blocks, f_bfree, and f_bavail
390          * are reported in units of f_frsize.  Linux hasn't had
391          * an f_frsize field in its statfs struct until recently,
392          * thus historically Linux's sys_statfs reports these
393          * fields in units of f_bsize.
394          */
395         buf->f_bsize = dentry->d_sb->s_blocksize;
396         blockbits = dentry->d_sb->s_blocksize_bits;
397         blockres = (1 << blockbits) - 1;
398         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
399         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
400         buf->f_bavail = (res.abytes + blockres) >> blockbits;
401
402         buf->f_files = res.tfiles;
403         buf->f_ffree = res.afiles;
404
405         buf->f_namelen = server->namelen;
406
407         unlock_kernel();
408         return 0;
409
410  out_err:
411         dprintk("%s: statfs error = %d\n", __func__, -error);
412         unlock_kernel();
413         return error;
414 }
415
416 /*
417  * Map the security flavour number to a name
418  */
419 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
420 {
421         static const struct {
422                 rpc_authflavor_t flavour;
423                 const char *str;
424         } sec_flavours[] = {
425                 { RPC_AUTH_NULL, "null" },
426                 { RPC_AUTH_UNIX, "sys" },
427                 { RPC_AUTH_GSS_KRB5, "krb5" },
428                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
429                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
430                 { RPC_AUTH_GSS_LKEY, "lkey" },
431                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
432                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
433                 { RPC_AUTH_GSS_SPKM, "spkm" },
434                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
435                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
436                 { UINT_MAX, "unknown" }
437         };
438         int i;
439
440         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
441                 if (sec_flavours[i].flavour == flavour)
442                         break;
443         }
444         return sec_flavours[i].str;
445 }
446
447 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
448                                     int showdefaults)
449 {
450         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
451
452         switch (sap->sa_family) {
453         case AF_INET: {
454                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
455                 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
456                                 NIPQUAD(sin->sin_addr.s_addr));
457                 break;
458         }
459         case AF_INET6: {
460                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
461                 seq_printf(m, ",mountaddr=" NIP6_FMT,
462                                 NIP6(sin6->sin6_addr));
463                 break;
464         }
465         default:
466                 if (showdefaults)
467                         seq_printf(m, ",mountaddr=unspecified");
468         }
469
470         if (nfss->mountd_version || showdefaults)
471                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
472         if (nfss->mountd_port || showdefaults)
473                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
474
475         switch (nfss->mountd_protocol) {
476         case IPPROTO_UDP:
477                 seq_printf(m, ",mountproto=udp");
478                 break;
479         case IPPROTO_TCP:
480                 seq_printf(m, ",mountproto=tcp");
481                 break;
482         default:
483                 if (showdefaults)
484                         seq_printf(m, ",mountproto=auto");
485         }
486 }
487
488 /*
489  * Describe the mount options in force on this server representation
490  */
491 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
492                                    int showdefaults)
493 {
494         static const struct proc_nfs_info {
495                 int flag;
496                 const char *str;
497                 const char *nostr;
498         } nfs_info[] = {
499                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
500                 { NFS_MOUNT_INTR, ",intr", ",nointr" },
501                 { NFS_MOUNT_POSIX, ",posix", "" },
502                 { NFS_MOUNT_NOCTO, ",nocto", "" },
503                 { NFS_MOUNT_NOAC, ",noac", "" },
504                 { NFS_MOUNT_NONLM, ",nolock", "" },
505                 { NFS_MOUNT_NOACL, ",noacl", "" },
506                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
507                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
508                 { 0, NULL, NULL }
509         };
510         const struct proc_nfs_info *nfs_infop;
511         struct nfs_client *clp = nfss->nfs_client;
512         u32 version = clp->rpc_ops->version;
513
514         seq_printf(m, ",vers=%u", version);
515         seq_printf(m, ",rsize=%u", nfss->rsize);
516         seq_printf(m, ",wsize=%u", nfss->wsize);
517         if (nfss->bsize != 0)
518                 seq_printf(m, ",bsize=%u", nfss->bsize);
519         seq_printf(m, ",namlen=%u", nfss->namelen);
520         if (nfss->acregmin != 3*HZ || showdefaults)
521                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
522         if (nfss->acregmax != 60*HZ || showdefaults)
523                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
524         if (nfss->acdirmin != 30*HZ || showdefaults)
525                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
526         if (nfss->acdirmax != 60*HZ || showdefaults)
527                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
528         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
529                 if (nfss->flags & nfs_infop->flag)
530                         seq_puts(m, nfs_infop->str);
531                 else
532                         seq_puts(m, nfs_infop->nostr);
533         }
534         seq_printf(m, ",proto=%s",
535                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
536         if (version == 4) {
537                 if (nfss->port != NFS_PORT)
538                         seq_printf(m, ",port=%u", nfss->port);
539         } else
540                 if (nfss->port)
541                         seq_printf(m, ",port=%u", nfss->port);
542
543         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
544         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
545         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
546
547         if (version != 4)
548                 nfs_show_mountd_options(m, nfss, showdefaults);
549
550 #ifdef CONFIG_NFS_V4
551         if (clp->rpc_ops->version == 4)
552                 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
553 #endif
554 }
555
556 /*
557  * Describe the mount options on this VFS mountpoint
558  */
559 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
560 {
561         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
562
563         nfs_show_mount_options(m, nfss, 0);
564
565         seq_printf(m, ",addr=%s",
566                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
567                                                         RPC_DISPLAY_ADDR));
568
569         return 0;
570 }
571
572 /*
573  * Present statistical information for this VFS mountpoint
574  */
575 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
576 {
577         int i, cpu;
578         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
579         struct rpc_auth *auth = nfss->client->cl_auth;
580         struct nfs_iostats totals = { };
581
582         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
583
584         /*
585          * Display all mount option settings
586          */
587         seq_printf(m, "\n\topts:\t");
588         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
589         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
590         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
591         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
592         nfs_show_mount_options(m, nfss, 1);
593
594         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
595
596         seq_printf(m, "\n\tcaps:\t");
597         seq_printf(m, "caps=0x%x", nfss->caps);
598         seq_printf(m, ",wtmult=%u", nfss->wtmult);
599         seq_printf(m, ",dtsize=%u", nfss->dtsize);
600         seq_printf(m, ",bsize=%u", nfss->bsize);
601         seq_printf(m, ",namlen=%u", nfss->namelen);
602
603 #ifdef CONFIG_NFS_V4
604         if (nfss->nfs_client->rpc_ops->version == 4) {
605                 seq_printf(m, "\n\tnfsv4:\t");
606                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
607                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
608                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
609         }
610 #endif
611
612         /*
613          * Display security flavor in effect for this mount
614          */
615         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
616         if (auth->au_flavor)
617                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
618
619         /*
620          * Display superblock I/O counters
621          */
622         for_each_possible_cpu(cpu) {
623                 struct nfs_iostats *stats;
624
625                 preempt_disable();
626                 stats = per_cpu_ptr(nfss->io_stats, cpu);
627
628                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
629                         totals.events[i] += stats->events[i];
630                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
631                         totals.bytes[i] += stats->bytes[i];
632
633                 preempt_enable();
634         }
635
636         seq_printf(m, "\n\tevents:\t");
637         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
638                 seq_printf(m, "%lu ", totals.events[i]);
639         seq_printf(m, "\n\tbytes:\t");
640         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
641                 seq_printf(m, "%Lu ", totals.bytes[i]);
642         seq_printf(m, "\n");
643
644         rpc_print_iostats(m, nfss->client);
645
646         return 0;
647 }
648
649 /*
650  * Begin unmount by attempting to remove all automounted mountpoints we added
651  * in response to xdev traversals and referrals
652  */
653 static void nfs_umount_begin(struct super_block *sb)
654 {
655         struct nfs_server *server = NFS_SB(sb);
656         struct rpc_clnt *rpc;
657
658         /* -EIO all pending I/O */
659         rpc = server->client_acl;
660         if (!IS_ERR(rpc))
661                 rpc_killall_tasks(rpc);
662         rpc = server->client;
663         if (!IS_ERR(rpc))
664                 rpc_killall_tasks(rpc);
665 }
666
667 /*
668  * Set the port number in an address.  Be agnostic about the address family.
669  */
670 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
671 {
672         switch (sap->sa_family) {
673         case AF_INET: {
674                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
675                 ap->sin_port = htons(port);
676                 break;
677         }
678         case AF_INET6: {
679                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
680                 ap->sin6_port = htons(port);
681                 break;
682         }
683         }
684 }
685
686 /*
687  * Sanity-check a server address provided by the mount command.
688  *
689  * Address family must be initialized, and address must not be
690  * the ANY address for that family.
691  */
692 static int nfs_verify_server_address(struct sockaddr *addr)
693 {
694         switch (addr->sa_family) {
695         case AF_INET: {
696                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
697                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
698         }
699         case AF_INET6: {
700                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
701                 return !ipv6_addr_any(sa);
702         }
703         }
704
705         return 0;
706 }
707
708 /*
709  * Parse string addresses passed in via a mount option,
710  * and construct a sockaddr based on the result.
711  *
712  * If address parsing fails, set the sockaddr's address
713  * family to AF_UNSPEC to force nfs_verify_server_address()
714  * to punt the mount.
715  */
716 static void nfs_parse_server_address(char *value,
717                                      struct sockaddr *sap,
718                                      size_t *len)
719 {
720         if (strchr(value, ':')) {
721                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
722                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
723
724                 ap->sin6_family = AF_INET6;
725                 *len = sizeof(*ap);
726                 if (in6_pton(value, -1, addr, '\0', NULL))
727                         return;
728         } else {
729                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
730                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
731
732                 ap->sin_family = AF_INET;
733                 *len = sizeof(*ap);
734                 if (in4_pton(value, -1, addr, '\0', NULL))
735                         return;
736         }
737
738         sap->sa_family = AF_UNSPEC;
739         *len = 0;
740 }
741
742 /*
743  * Error-check and convert a string of mount options from user space into
744  * a data structure
745  */
746 static int nfs_parse_mount_options(char *raw,
747                                    struct nfs_parsed_mount_data *mnt)
748 {
749         char *p, *string, *secdata;
750         int rc;
751
752         if (!raw) {
753                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
754                 return 1;
755         }
756         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
757
758         secdata = alloc_secdata();
759         if (!secdata)
760                 goto out_nomem;
761
762         rc = security_sb_copy_data(raw, secdata);
763         if (rc)
764                 goto out_security_failure;
765
766         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
767         if (rc)
768                 goto out_security_failure;
769
770         free_secdata(secdata);
771
772         while ((p = strsep(&raw, ",")) != NULL) {
773                 substring_t args[MAX_OPT_ARGS];
774                 int option, token;
775
776                 if (!*p)
777                         continue;
778
779                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
780
781                 token = match_token(p, nfs_mount_option_tokens, args);
782                 switch (token) {
783                 case Opt_soft:
784                         mnt->flags |= NFS_MOUNT_SOFT;
785                         break;
786                 case Opt_hard:
787                         mnt->flags &= ~NFS_MOUNT_SOFT;
788                         break;
789                 case Opt_posix:
790                         mnt->flags |= NFS_MOUNT_POSIX;
791                         break;
792                 case Opt_noposix:
793                         mnt->flags &= ~NFS_MOUNT_POSIX;
794                         break;
795                 case Opt_cto:
796                         mnt->flags &= ~NFS_MOUNT_NOCTO;
797                         break;
798                 case Opt_nocto:
799                         mnt->flags |= NFS_MOUNT_NOCTO;
800                         break;
801                 case Opt_ac:
802                         mnt->flags &= ~NFS_MOUNT_NOAC;
803                         break;
804                 case Opt_noac:
805                         mnt->flags |= NFS_MOUNT_NOAC;
806                         break;
807                 case Opt_lock:
808                         mnt->flags &= ~NFS_MOUNT_NONLM;
809                         break;
810                 case Opt_nolock:
811                         mnt->flags |= NFS_MOUNT_NONLM;
812                         break;
813                 case Opt_v2:
814                         mnt->flags &= ~NFS_MOUNT_VER3;
815                         break;
816                 case Opt_v3:
817                         mnt->flags |= NFS_MOUNT_VER3;
818                         break;
819                 case Opt_udp:
820                         mnt->flags &= ~NFS_MOUNT_TCP;
821                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
822                         mnt->timeo = 7;
823                         mnt->retrans = 5;
824                         break;
825                 case Opt_tcp:
826                         mnt->flags |= NFS_MOUNT_TCP;
827                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
828                         mnt->timeo = 600;
829                         mnt->retrans = 2;
830                         break;
831                 case Opt_rdma:
832                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
833                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
834                         mnt->timeo = 600;
835                         mnt->retrans = 2;
836                         break;
837                 case Opt_acl:
838                         mnt->flags &= ~NFS_MOUNT_NOACL;
839                         break;
840                 case Opt_noacl:
841                         mnt->flags |= NFS_MOUNT_NOACL;
842                         break;
843                 case Opt_rdirplus:
844                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
845                         break;
846                 case Opt_nordirplus:
847                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
848                         break;
849                 case Opt_sharecache:
850                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
851                         break;
852                 case Opt_nosharecache:
853                         mnt->flags |= NFS_MOUNT_UNSHARED;
854                         break;
855
856                 case Opt_port:
857                         if (match_int(args, &option))
858                                 return 0;
859                         if (option < 0 || option > 65535)
860                                 return 0;
861                         mnt->nfs_server.port = option;
862                         break;
863                 case Opt_rsize:
864                         if (match_int(args, &mnt->rsize))
865                                 return 0;
866                         break;
867                 case Opt_wsize:
868                         if (match_int(args, &mnt->wsize))
869                                 return 0;
870                         break;
871                 case Opt_bsize:
872                         if (match_int(args, &option))
873                                 return 0;
874                         if (option < 0)
875                                 return 0;
876                         mnt->bsize = option;
877                         break;
878                 case Opt_timeo:
879                         if (match_int(args, &mnt->timeo))
880                                 return 0;
881                         break;
882                 case Opt_retrans:
883                         if (match_int(args, &mnt->retrans))
884                                 return 0;
885                         break;
886                 case Opt_acregmin:
887                         if (match_int(args, &mnt->acregmin))
888                                 return 0;
889                         break;
890                 case Opt_acregmax:
891                         if (match_int(args, &mnt->acregmax))
892                                 return 0;
893                         break;
894                 case Opt_acdirmin:
895                         if (match_int(args, &mnt->acdirmin))
896                                 return 0;
897                         break;
898                 case Opt_acdirmax:
899                         if (match_int(args, &mnt->acdirmax))
900                                 return 0;
901                         break;
902                 case Opt_actimeo:
903                         if (match_int(args, &option))
904                                 return 0;
905                         if (option < 0)
906                                 return 0;
907                         mnt->acregmin =
908                         mnt->acregmax =
909                         mnt->acdirmin =
910                         mnt->acdirmax = option;
911                         break;
912                 case Opt_namelen:
913                         if (match_int(args, &mnt->namlen))
914                                 return 0;
915                         break;
916                 case Opt_mountport:
917                         if (match_int(args, &option))
918                                 return 0;
919                         if (option < 0 || option > 65535)
920                                 return 0;
921                         mnt->mount_server.port = option;
922                         break;
923                 case Opt_mountvers:
924                         if (match_int(args, &option))
925                                 return 0;
926                         if (option < 0)
927                                 return 0;
928                         mnt->mount_server.version = option;
929                         break;
930                 case Opt_nfsvers:
931                         if (match_int(args, &option))
932                                 return 0;
933                         switch (option) {
934                         case 2:
935                                 mnt->flags &= ~NFS_MOUNT_VER3;
936                                 break;
937                         case 3:
938                                 mnt->flags |= NFS_MOUNT_VER3;
939                                 break;
940                         default:
941                                 goto out_unrec_vers;
942                         }
943                         break;
944
945                 case Opt_sec:
946                         string = match_strdup(args);
947                         if (string == NULL)
948                                 goto out_nomem;
949                         token = match_token(string, nfs_secflavor_tokens, args);
950                         kfree(string);
951
952                         /*
953                          * The flags setting is for v2/v3.  The flavor_len
954                          * setting is for v4.  v2/v3 also need to know the
955                          * difference between NULL and UNIX.
956                          */
957                         switch (token) {
958                         case Opt_sec_none:
959                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
960                                 mnt->auth_flavor_len = 0;
961                                 mnt->auth_flavors[0] = RPC_AUTH_NULL;
962                                 break;
963                         case Opt_sec_sys:
964                                 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
965                                 mnt->auth_flavor_len = 0;
966                                 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
967                                 break;
968                         case Opt_sec_krb5:
969                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
970                                 mnt->auth_flavor_len = 1;
971                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
972                                 break;
973                         case Opt_sec_krb5i:
974                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
975                                 mnt->auth_flavor_len = 1;
976                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
977                                 break;
978                         case Opt_sec_krb5p:
979                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
980                                 mnt->auth_flavor_len = 1;
981                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
982                                 break;
983                         case Opt_sec_lkey:
984                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
985                                 mnt->auth_flavor_len = 1;
986                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
987                                 break;
988                         case Opt_sec_lkeyi:
989                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
990                                 mnt->auth_flavor_len = 1;
991                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
992                                 break;
993                         case Opt_sec_lkeyp:
994                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
995                                 mnt->auth_flavor_len = 1;
996                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
997                                 break;
998                         case Opt_sec_spkm:
999                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1000                                 mnt->auth_flavor_len = 1;
1001                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1002                                 break;
1003                         case Opt_sec_spkmi:
1004                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1005                                 mnt->auth_flavor_len = 1;
1006                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1007                                 break;
1008                         case Opt_sec_spkmp:
1009                                 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1010                                 mnt->auth_flavor_len = 1;
1011                                 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1012                                 break;
1013                         default:
1014                                 goto out_unrec_sec;
1015                         }
1016                         break;
1017                 case Opt_proto:
1018                         string = match_strdup(args);
1019                         if (string == NULL)
1020                                 goto out_nomem;
1021                         token = match_token(string,
1022                                             nfs_xprt_protocol_tokens, args);
1023                         kfree(string);
1024
1025                         switch (token) {
1026                         case Opt_xprt_udp:
1027                                 mnt->flags &= ~NFS_MOUNT_TCP;
1028                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1029                                 mnt->timeo = 7;
1030                                 mnt->retrans = 5;
1031                                 break;
1032                         case Opt_xprt_tcp:
1033                                 mnt->flags |= NFS_MOUNT_TCP;
1034                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1035                                 mnt->timeo = 600;
1036                                 mnt->retrans = 2;
1037                                 break;
1038                         case Opt_xprt_rdma:
1039                                 /* vector side protocols to TCP */
1040                                 mnt->flags |= NFS_MOUNT_TCP;
1041                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1042                                 mnt->timeo = 600;
1043                                 mnt->retrans = 2;
1044                                 break;
1045                         default:
1046                                 goto out_unrec_xprt;
1047                         }
1048                         break;
1049                 case Opt_mountproto:
1050                         string = match_strdup(args);
1051                         if (string == NULL)
1052                                 goto out_nomem;
1053                         token = match_token(string,
1054                                             nfs_xprt_protocol_tokens, args);
1055                         kfree(string);
1056
1057                         switch (token) {
1058                         case Opt_xprt_udp:
1059                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1060                                 break;
1061                         case Opt_xprt_tcp:
1062                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1063                                 break;
1064                         case Opt_xprt_rdma: /* not used for side protocols */
1065                         default:
1066                                 goto out_unrec_xprt;
1067                         }
1068                         break;
1069                 case Opt_addr:
1070                         string = match_strdup(args);
1071                         if (string == NULL)
1072                                 goto out_nomem;
1073                         nfs_parse_server_address(string, (struct sockaddr *)
1074                                                  &mnt->nfs_server.address,
1075                                                  &mnt->nfs_server.addrlen);
1076                         kfree(string);
1077                         break;
1078                 case Opt_clientaddr:
1079                         string = match_strdup(args);
1080                         if (string == NULL)
1081                                 goto out_nomem;
1082                         kfree(mnt->client_address);
1083                         mnt->client_address = string;
1084                         break;
1085                 case Opt_mounthost:
1086                         string = match_strdup(args);
1087                         if (string == NULL)
1088                                 goto out_nomem;
1089                         kfree(mnt->mount_server.hostname);
1090                         mnt->mount_server.hostname = string;
1091                         break;
1092                 case Opt_mountaddr:
1093                         string = match_strdup(args);
1094                         if (string == NULL)
1095                                 goto out_nomem;
1096                         nfs_parse_server_address(string, (struct sockaddr *)
1097                                                  &mnt->mount_server.address,
1098                                                  &mnt->mount_server.addrlen);
1099                         kfree(string);
1100                         break;
1101
1102                 case Opt_userspace:
1103                 case Opt_deprecated:
1104                         dfprintk(MOUNT, "NFS:   ignoring mount option "
1105                                         "'%s'\n", p);
1106                         break;
1107
1108                 default:
1109                         goto out_unknown;
1110                 }
1111         }
1112
1113         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1114                                 mnt->nfs_server.port);
1115
1116         return 1;
1117
1118 out_nomem:
1119         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1120         return 0;
1121 out_security_failure:
1122         free_secdata(secdata);
1123         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1124         return 0;
1125 out_unrec_vers:
1126         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1127         return 0;
1128
1129 out_unrec_xprt:
1130         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1131         return 0;
1132
1133 out_unrec_sec:
1134         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1135         return 0;
1136
1137 out_unknown:
1138         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1139         return 0;
1140 }
1141
1142 /*
1143  * Use the remote server's MOUNT service to request the NFS file handle
1144  * corresponding to the provided path.
1145  */
1146 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1147                          struct nfs_fh *root_fh)
1148 {
1149         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1150         char *hostname;
1151         int status;
1152
1153         if (args->mount_server.version == 0) {
1154                 if (args->flags & NFS_MOUNT_VER3)
1155                         args->mount_server.version = NFS_MNT3_VERSION;
1156                 else
1157                         args->mount_server.version = NFS_MNT_VERSION;
1158         }
1159
1160         if (args->mount_server.hostname)
1161                 hostname = args->mount_server.hostname;
1162         else
1163                 hostname = args->nfs_server.hostname;
1164
1165         /*
1166          * Construct the mount server's address.
1167          */
1168         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1169                 memcpy(sap, &args->nfs_server.address,
1170                        args->nfs_server.addrlen);
1171                 args->mount_server.addrlen = args->nfs_server.addrlen;
1172         }
1173
1174         /*
1175          * autobind will be used if mount_server.port == 0
1176          */
1177         nfs_set_port(sap, args->mount_server.port);
1178
1179         /*
1180          * Now ask the mount server to map our export path
1181          * to a file handle.
1182          */
1183         status = nfs_mount(sap,
1184                            args->mount_server.addrlen,
1185                            hostname,
1186                            args->nfs_server.export_path,
1187                            args->mount_server.version,
1188                            args->mount_server.protocol,
1189                            root_fh);
1190         if (status == 0)
1191                 return 0;
1192
1193         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1194                         hostname, status);
1195         return status;
1196 }
1197
1198 /*
1199  * Validate the NFS2/NFS3 mount data
1200  * - fills in the mount root filehandle
1201  *
1202  * For option strings, user space handles the following behaviors:
1203  *
1204  * + DNS: mapping server host name to IP address ("addr=" option)
1205  *
1206  * + failure mode: how to behave if a mount request can't be handled
1207  *   immediately ("fg/bg" option)
1208  *
1209  * + retry: how often to retry a mount request ("retry=" option)
1210  *
1211  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1212  *   mountproto=tcp after mountproto=udp, and so on
1213  */
1214 static int nfs_validate_mount_data(void *options,
1215                                    struct nfs_parsed_mount_data *args,
1216                                    struct nfs_fh *mntfh,
1217                                    const char *dev_name)
1218 {
1219         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1220
1221         if (data == NULL)
1222                 goto out_no_data;
1223
1224         args->flags             = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1225         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1226         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1227         args->timeo             = 600;
1228         args->retrans           = 2;
1229         args->acregmin          = 3;
1230         args->acregmax          = 60;
1231         args->acdirmin          = 30;
1232         args->acdirmax          = 60;
1233         args->mount_server.port = 0;    /* autobind unless user sets port */
1234         args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1235         args->nfs_server.port   = 0;    /* autobind unless user sets port */
1236         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1237
1238         switch (data->version) {
1239         case 1:
1240                 data->namlen = 0;
1241         case 2:
1242                 data->bsize = 0;
1243         case 3:
1244                 if (data->flags & NFS_MOUNT_VER3)
1245                         goto out_no_v3;
1246                 data->root.size = NFS2_FHSIZE;
1247                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1248         case 4:
1249                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1250                         goto out_no_sec;
1251         case 5:
1252                 memset(data->context, 0, sizeof(data->context));
1253         case 6:
1254                 if (data->flags & NFS_MOUNT_VER3) {
1255                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1256                                 goto out_invalid_fh;
1257                         mntfh->size = data->root.size;
1258                 } else
1259                         mntfh->size = NFS2_FHSIZE;
1260
1261
1262                 memcpy(mntfh->data, data->root.data, mntfh->size);
1263                 if (mntfh->size < sizeof(mntfh->data))
1264                         memset(mntfh->data + mntfh->size, 0,
1265                                sizeof(mntfh->data) - mntfh->size);
1266
1267                 /*
1268                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
1269                  * can deal with.
1270                  */
1271                 args->flags             = data->flags;
1272                 args->rsize             = data->rsize;
1273                 args->wsize             = data->wsize;
1274                 args->timeo             = data->timeo;
1275                 args->retrans           = data->retrans;
1276                 args->acregmin          = data->acregmin;
1277                 args->acregmax          = data->acregmax;
1278                 args->acdirmin          = data->acdirmin;
1279                 args->acdirmax          = data->acdirmax;
1280
1281                 memcpy(&args->nfs_server.address, &data->addr,
1282                        sizeof(data->addr));
1283                 args->nfs_server.addrlen = sizeof(data->addr);
1284                 if (!nfs_verify_server_address((struct sockaddr *)
1285                                                 &args->nfs_server.address))
1286                         goto out_no_address;
1287
1288                 if (!(data->flags & NFS_MOUNT_TCP))
1289                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1290                 /* N.B. caller will free nfs_server.hostname in all cases */
1291                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1292                 args->namlen            = data->namlen;
1293                 args->bsize             = data->bsize;
1294                 args->auth_flavors[0]   = data->pseudoflavor;
1295                 if (!args->nfs_server.hostname)
1296                         goto out_nomem;
1297
1298                 /*
1299                  * The legacy version 6 binary mount data from userspace has a
1300                  * field used only to transport selinux information into the
1301                  * the kernel.  To continue to support that functionality we
1302                  * have a touch of selinux knowledge here in the NFS code. The
1303                  * userspace code converted context=blah to just blah so we are
1304                  * converting back to the full string selinux understands.
1305                  */
1306                 if (data->context[0]){
1307 #ifdef CONFIG_SECURITY_SELINUX
1308                         int rc;
1309                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1310                         if (!opts_str)
1311                                 return -ENOMEM;
1312                         strcpy(opts_str, "context=");
1313                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1314                         strcat(opts_str, &data->context[0]);
1315                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1316                         kfree(opts_str);
1317                         if (rc)
1318                                 return rc;
1319 #else
1320                         return -EINVAL;
1321 #endif
1322                 }
1323
1324                 break;
1325         default: {
1326                 unsigned int len;
1327                 char *c;
1328                 int status;
1329
1330                 if (nfs_parse_mount_options((char *)options, args) == 0)
1331                         return -EINVAL;
1332
1333                 if (!nfs_verify_server_address((struct sockaddr *)
1334                                                 &args->nfs_server.address))
1335                         goto out_no_address;
1336
1337                 c = strchr(dev_name, ':');
1338                 if (c == NULL)
1339                         return -EINVAL;
1340                 len = c - dev_name;
1341                 /* N.B. caller will free nfs_server.hostname in all cases */
1342                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1343                 if (!args->nfs_server.hostname)
1344                         goto out_nomem;
1345
1346                 c++;
1347                 if (strlen(c) > NFS_MAXPATHLEN)
1348                         return -ENAMETOOLONG;
1349                 args->nfs_server.export_path = c;
1350
1351                 status = nfs_try_mount(args, mntfh);
1352                 if (status)
1353                         return status;
1354
1355                 break;
1356                 }
1357         }
1358
1359         if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1360                 args->auth_flavors[0] = RPC_AUTH_UNIX;
1361
1362 #ifndef CONFIG_NFS_V3
1363         if (args->flags & NFS_MOUNT_VER3)
1364                 goto out_v3_not_compiled;
1365 #endif /* !CONFIG_NFS_V3 */
1366
1367         return 0;
1368
1369 out_no_data:
1370         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1371         return -EINVAL;
1372
1373 out_no_v3:
1374         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1375                  data->version);
1376         return -EINVAL;
1377
1378 out_no_sec:
1379         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1380         return -EINVAL;
1381
1382 #ifndef CONFIG_NFS_V3
1383 out_v3_not_compiled:
1384         dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1385         return -EPROTONOSUPPORT;
1386 #endif /* !CONFIG_NFS_V3 */
1387
1388 out_nomem:
1389         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1390         return -ENOMEM;
1391
1392 out_no_address:
1393         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1394         return -EINVAL;
1395
1396 out_invalid_fh:
1397         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1398         return -EINVAL;
1399 }
1400
1401 static int
1402 nfs_compare_remount_data(struct nfs_server *nfss,
1403                          struct nfs_parsed_mount_data *data)
1404 {
1405         if (data->flags != nfss->flags ||
1406             data->rsize != nfss->rsize ||
1407             data->wsize != nfss->wsize ||
1408             data->retrans != nfss->client->cl_timeout->to_retries ||
1409             data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1410             data->acregmin != nfss->acregmin / HZ ||
1411             data->acregmax != nfss->acregmax / HZ ||
1412             data->acdirmin != nfss->acdirmin / HZ ||
1413             data->acdirmax != nfss->acdirmax / HZ ||
1414             data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1415             data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1416             memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1417                    data->nfs_server.addrlen) != 0)
1418                 return -EINVAL;
1419
1420         return 0;
1421 }
1422
1423 static int
1424 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1425 {
1426         int error;
1427         struct nfs_server *nfss = sb->s_fs_info;
1428         struct nfs_parsed_mount_data *data;
1429         struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1430         struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1431
1432         /*
1433          * Userspace mount programs that send binary options generally send
1434          * them populated with default values. We have no way to know which
1435          * ones were explicitly specified. Fall back to legacy behavior and
1436          * just return success.
1437          */
1438         if ((sb->s_type == &nfs4_fs_type && options4->version == 1) ||
1439             (sb->s_type == &nfs_fs_type && options->version >= 1 &&
1440              options->version <= 6))
1441                 return 0;
1442
1443         data = kzalloc(sizeof(*data), GFP_KERNEL);
1444         if (data == NULL)
1445                 return -ENOMEM;
1446
1447         /* fill out struct with values from existing mount */
1448         data->flags = nfss->flags;
1449         data->rsize = nfss->rsize;
1450         data->wsize = nfss->wsize;
1451         data->retrans = nfss->client->cl_timeout->to_retries;
1452         data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1453         data->acregmin = nfss->acregmin / HZ;
1454         data->acregmax = nfss->acregmax / HZ;
1455         data->acdirmin = nfss->acdirmin / HZ;
1456         data->acdirmax = nfss->acdirmax / HZ;
1457         data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1458         data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1459         memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1460                 data->nfs_server.addrlen);
1461
1462         /* overwrite those values with any that were specified */
1463         error = nfs_parse_mount_options((char *)options, data);
1464         if (error < 0)
1465                 goto out;
1466
1467         /* compare new mount options with old ones */
1468         error = nfs_compare_remount_data(nfss, data);
1469 out:
1470         kfree(data);
1471         return error;
1472 }
1473
1474 /*
1475  * Initialise the common bits of the superblock
1476  */
1477 static inline void nfs_initialise_sb(struct super_block *sb)
1478 {
1479         struct nfs_server *server = NFS_SB(sb);
1480
1481         sb->s_magic = NFS_SUPER_MAGIC;
1482
1483         /* We probably want something more informative here */
1484         snprintf(sb->s_id, sizeof(sb->s_id),
1485                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1486
1487         if (sb->s_blocksize == 0)
1488                 sb->s_blocksize = nfs_block_bits(server->wsize,
1489                                                  &sb->s_blocksize_bits);
1490
1491         if (server->flags & NFS_MOUNT_NOAC)
1492                 sb->s_flags |= MS_SYNCHRONOUS;
1493
1494         nfs_super_set_maxbytes(sb, server->maxfilesize);
1495 }
1496
1497 /*
1498  * Finish setting up an NFS2/3 superblock
1499  */
1500 static void nfs_fill_super(struct super_block *sb,
1501                            struct nfs_parsed_mount_data *data)
1502 {
1503         struct nfs_server *server = NFS_SB(sb);
1504
1505         sb->s_blocksize_bits = 0;
1506         sb->s_blocksize = 0;
1507         if (data->bsize)
1508                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1509
1510         if (server->flags & NFS_MOUNT_VER3) {
1511                 /* The VFS shouldn't apply the umask to mode bits. We will do
1512                  * so ourselves when necessary.
1513                  */
1514                 sb->s_flags |= MS_POSIXACL;
1515                 sb->s_time_gran = 1;
1516         }
1517
1518         sb->s_op = &nfs_sops;
1519         nfs_initialise_sb(sb);
1520 }
1521
1522 /*
1523  * Finish setting up a cloned NFS2/3 superblock
1524  */
1525 static void nfs_clone_super(struct super_block *sb,
1526                             const struct super_block *old_sb)
1527 {
1528         struct nfs_server *server = NFS_SB(sb);
1529
1530         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1531         sb->s_blocksize = old_sb->s_blocksize;
1532         sb->s_maxbytes = old_sb->s_maxbytes;
1533
1534         if (server->flags & NFS_MOUNT_VER3) {
1535                 /* The VFS shouldn't apply the umask to mode bits. We will do
1536                  * so ourselves when necessary.
1537                  */
1538                 sb->s_flags |= MS_POSIXACL;
1539                 sb->s_time_gran = 1;
1540         }
1541
1542         sb->s_op = old_sb->s_op;
1543         nfs_initialise_sb(sb);
1544 }
1545
1546 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1547
1548 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1549 {
1550         const struct nfs_server *a = s->s_fs_info;
1551         const struct rpc_clnt *clnt_a = a->client;
1552         const struct rpc_clnt *clnt_b = b->client;
1553
1554         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1555                 goto Ebusy;
1556         if (a->nfs_client != b->nfs_client)
1557                 goto Ebusy;
1558         if (a->flags != b->flags)
1559                 goto Ebusy;
1560         if (a->wsize != b->wsize)
1561                 goto Ebusy;
1562         if (a->rsize != b->rsize)
1563                 goto Ebusy;
1564         if (a->acregmin != b->acregmin)
1565                 goto Ebusy;
1566         if (a->acregmax != b->acregmax)
1567                 goto Ebusy;
1568         if (a->acdirmin != b->acdirmin)
1569                 goto Ebusy;
1570         if (a->acdirmax != b->acdirmax)
1571                 goto Ebusy;
1572         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1573                 goto Ebusy;
1574         return 1;
1575 Ebusy:
1576         return 0;
1577 }
1578
1579 struct nfs_sb_mountdata {
1580         struct nfs_server *server;
1581         int mntflags;
1582 };
1583
1584 static int nfs_set_super(struct super_block *s, void *data)
1585 {
1586         struct nfs_sb_mountdata *sb_mntdata = data;
1587         struct nfs_server *server = sb_mntdata->server;
1588         int ret;
1589
1590         s->s_flags = sb_mntdata->mntflags;
1591         s->s_fs_info = server;
1592         ret = set_anon_super(s, server);
1593         if (ret == 0)
1594                 server->s_dev = s->s_dev;
1595         return ret;
1596 }
1597
1598 static int nfs_compare_super_address(struct nfs_server *server1,
1599                                      struct nfs_server *server2)
1600 {
1601         struct sockaddr *sap1, *sap2;
1602
1603         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1604         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1605
1606         if (sap1->sa_family != sap2->sa_family)
1607                 return 0;
1608
1609         switch (sap1->sa_family) {
1610         case AF_INET: {
1611                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1612                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1613                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1614                         return 0;
1615                 if (sin1->sin_port != sin2->sin_port)
1616                         return 0;
1617                 break;
1618         }
1619         case AF_INET6: {
1620                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1621                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1622                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1623                         return 0;
1624                 if (sin1->sin6_port != sin2->sin6_port)
1625                         return 0;
1626                 break;
1627         }
1628         default:
1629                 return 0;
1630         }
1631
1632         return 1;
1633 }
1634
1635 static int nfs_compare_super(struct super_block *sb, void *data)
1636 {
1637         struct nfs_sb_mountdata *sb_mntdata = data;
1638         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1639         int mntflags = sb_mntdata->mntflags;
1640
1641         if (!nfs_compare_super_address(old, server))
1642                 return 0;
1643         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1644         if (old->flags & NFS_MOUNT_UNSHARED)
1645                 return 0;
1646         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1647                 return 0;
1648         return nfs_compare_mount_options(sb, server, mntflags);
1649 }
1650
1651 static int nfs_bdi_register(struct nfs_server *server)
1652 {
1653         return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1654 }
1655
1656 static int nfs_get_sb(struct file_system_type *fs_type,
1657         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1658 {
1659         struct nfs_server *server = NULL;
1660         struct super_block *s;
1661         struct nfs_parsed_mount_data *data;
1662         struct nfs_fh *mntfh;
1663         struct dentry *mntroot;
1664         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1665         struct nfs_sb_mountdata sb_mntdata = {
1666                 .mntflags = flags,
1667         };
1668         int error = -ENOMEM;
1669
1670         data = kzalloc(sizeof(*data), GFP_KERNEL);
1671         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1672         if (data == NULL || mntfh == NULL)
1673                 goto out_free_fh;
1674
1675         security_init_mnt_opts(&data->lsm_opts);
1676
1677         /* Validate the mount data */
1678         error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1679         if (error < 0)
1680                 goto out;
1681
1682         /* Get a volume representation */
1683         server = nfs_create_server(data, mntfh);
1684         if (IS_ERR(server)) {
1685                 error = PTR_ERR(server);
1686                 goto out;
1687         }
1688         sb_mntdata.server = server;
1689
1690         if (server->flags & NFS_MOUNT_UNSHARED)
1691                 compare_super = NULL;
1692
1693         /* Get a superblock - note that we may end up sharing one that already exists */
1694         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1695         if (IS_ERR(s)) {
1696                 error = PTR_ERR(s);
1697                 goto out_err_nosb;
1698         }
1699
1700         if (s->s_fs_info != server) {
1701                 nfs_free_server(server);
1702                 server = NULL;
1703         } else {
1704                 error = nfs_bdi_register(server);
1705                 if (error)
1706                         goto error_splat_super;
1707         }
1708
1709         if (!s->s_root) {
1710                 /* initial superblock/root creation */
1711                 nfs_fill_super(s, data);
1712         }
1713
1714         mntroot = nfs_get_root(s, mntfh);
1715         if (IS_ERR(mntroot)) {
1716                 error = PTR_ERR(mntroot);
1717                 goto error_splat_super;
1718         }
1719
1720         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1721         if (error)
1722                 goto error_splat_root;
1723
1724         s->s_flags |= MS_ACTIVE;
1725         mnt->mnt_sb = s;
1726         mnt->mnt_root = mntroot;
1727         error = 0;
1728
1729 out:
1730         kfree(data->nfs_server.hostname);
1731         kfree(data->mount_server.hostname);
1732         security_free_mnt_opts(&data->lsm_opts);
1733 out_free_fh:
1734         kfree(mntfh);
1735         kfree(data);
1736         return error;
1737
1738 out_err_nosb:
1739         nfs_free_server(server);
1740         goto out;
1741
1742 error_splat_root:
1743         dput(mntroot);
1744 error_splat_super:
1745         up_write(&s->s_umount);
1746         deactivate_super(s);
1747         goto out;
1748 }
1749
1750 /*
1751  * Destroy an NFS2/3 superblock
1752  */
1753 static void nfs_kill_super(struct super_block *s)
1754 {
1755         struct nfs_server *server = NFS_SB(s);
1756
1757         bdi_unregister(&server->backing_dev_info);
1758         kill_anon_super(s);
1759         nfs_free_server(server);
1760 }
1761
1762 /*
1763  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1764  */
1765 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1766                            const char *dev_name, void *raw_data,
1767                            struct vfsmount *mnt)
1768 {
1769         struct nfs_clone_mount *data = raw_data;
1770         struct super_block *s;
1771         struct nfs_server *server;
1772         struct dentry *mntroot;
1773         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1774         struct nfs_sb_mountdata sb_mntdata = {
1775                 .mntflags = flags,
1776         };
1777         int error;
1778
1779         dprintk("--> nfs_xdev_get_sb()\n");
1780
1781         /* create a new volume representation */
1782         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1783         if (IS_ERR(server)) {
1784                 error = PTR_ERR(server);
1785                 goto out_err_noserver;
1786         }
1787         sb_mntdata.server = server;
1788
1789         if (server->flags & NFS_MOUNT_UNSHARED)
1790                 compare_super = NULL;
1791
1792         /* Get a superblock - note that we may end up sharing one that already exists */
1793         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1794         if (IS_ERR(s)) {
1795                 error = PTR_ERR(s);
1796                 goto out_err_nosb;
1797         }
1798
1799         if (s->s_fs_info != server) {
1800                 nfs_free_server(server);
1801                 server = NULL;
1802         } else {
1803                 error = nfs_bdi_register(server);
1804                 if (error)
1805                         goto error_splat_super;
1806         }
1807
1808         if (!s->s_root) {
1809                 /* initial superblock/root creation */
1810                 nfs_clone_super(s, data->sb);
1811         }
1812
1813         mntroot = nfs_get_root(s, data->fh);
1814         if (IS_ERR(mntroot)) {
1815                 error = PTR_ERR(mntroot);
1816                 goto error_splat_super;
1817         }
1818         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1819                 dput(mntroot);
1820                 error = -ESTALE;
1821                 goto error_splat_super;
1822         }
1823
1824         s->s_flags |= MS_ACTIVE;
1825         mnt->mnt_sb = s;
1826         mnt->mnt_root = mntroot;
1827
1828         /* clone any lsm security options from the parent to the new sb */
1829         security_sb_clone_mnt_opts(data->sb, s);
1830
1831         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1832         return 0;
1833
1834 out_err_nosb:
1835         nfs_free_server(server);
1836 out_err_noserver:
1837         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1838         return error;
1839
1840 error_splat_super:
1841         up_write(&s->s_umount);
1842         deactivate_super(s);
1843         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1844         return error;
1845 }
1846
1847 #ifdef CONFIG_NFS_V4
1848
1849 /*
1850  * Finish setting up a cloned NFS4 superblock
1851  */
1852 static void nfs4_clone_super(struct super_block *sb,
1853                             const struct super_block *old_sb)
1854 {
1855         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1856         sb->s_blocksize = old_sb->s_blocksize;
1857         sb->s_maxbytes = old_sb->s_maxbytes;
1858         sb->s_time_gran = 1;
1859         sb->s_op = old_sb->s_op;
1860         nfs_initialise_sb(sb);
1861 }
1862
1863 /*
1864  * Set up an NFS4 superblock
1865  */
1866 static void nfs4_fill_super(struct super_block *sb)
1867 {
1868         sb->s_time_gran = 1;
1869         sb->s_op = &nfs4_sops;
1870         nfs_initialise_sb(sb);
1871 }
1872
1873 /*
1874  * Validate NFSv4 mount options
1875  */
1876 static int nfs4_validate_mount_data(void *options,
1877                                     struct nfs_parsed_mount_data *args,
1878                                     const char *dev_name)
1879 {
1880         struct sockaddr_in *ap;
1881         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1882         char *c;
1883
1884         if (data == NULL)
1885                 goto out_no_data;
1886
1887         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1888         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1889         args->timeo             = 600;
1890         args->retrans           = 2;
1891         args->acregmin          = 3;
1892         args->acregmax          = 60;
1893         args->acdirmin          = 30;
1894         args->acdirmax          = 60;
1895         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1896         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1897
1898         switch (data->version) {
1899         case 1:
1900                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1901                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1902                         goto out_no_address;
1903                 if (data->host_addrlen == 0)
1904                         goto out_no_address;
1905                 args->nfs_server.addrlen = data->host_addrlen;
1906                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1907                         return -EFAULT;
1908                 if (!nfs_verify_server_address((struct sockaddr *)
1909                                                 &args->nfs_server.address))
1910                         goto out_no_address;
1911
1912                 switch (data->auth_flavourlen) {
1913                 case 0:
1914                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1915                         break;
1916                 case 1:
1917                         if (copy_from_user(&args->auth_flavors[0],
1918                                            data->auth_flavours,
1919                                            sizeof(args->auth_flavors[0])))
1920                                 return -EFAULT;
1921                         break;
1922                 default:
1923                         goto out_inval_auth;
1924                 }
1925
1926                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1927                 if (IS_ERR(c))
1928                         return PTR_ERR(c);
1929                 args->nfs_server.hostname = c;
1930
1931                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1932                 if (IS_ERR(c))
1933                         return PTR_ERR(c);
1934                 args->nfs_server.export_path = c;
1935                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1936
1937                 c = strndup_user(data->client_addr.data, 16);
1938                 if (IS_ERR(c))
1939                         return PTR_ERR(c);
1940                 args->client_address = c;
1941
1942                 /*
1943                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1944                  * can deal with.
1945                  */
1946
1947                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1948                 args->rsize     = data->rsize;
1949                 args->wsize     = data->wsize;
1950                 args->timeo     = data->timeo;
1951                 args->retrans   = data->retrans;
1952                 args->acregmin  = data->acregmin;
1953                 args->acregmax  = data->acregmax;
1954                 args->acdirmin  = data->acdirmin;
1955                 args->acdirmax  = data->acdirmax;
1956                 args->nfs_server.protocol = data->proto;
1957
1958                 break;
1959         default: {
1960                 unsigned int len;
1961
1962                 if (nfs_parse_mount_options((char *)options, args) == 0)
1963                         return -EINVAL;
1964
1965                 if (!nfs_verify_server_address((struct sockaddr *)
1966                                                 &args->nfs_server.address))
1967                         return -EINVAL;
1968
1969                 switch (args->auth_flavor_len) {
1970                 case 0:
1971                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1972                         break;
1973                 case 1:
1974                         break;
1975                 default:
1976                         goto out_inval_auth;
1977                 }
1978
1979                 /*
1980                  * Split "dev_name" into "hostname:mntpath".
1981                  */
1982                 c = strchr(dev_name, ':');
1983                 if (c == NULL)
1984                         return -EINVAL;
1985                 /* while calculating len, pretend ':' is '\0' */
1986                 len = c - dev_name;
1987                 if (len > NFS4_MAXNAMLEN)
1988                         return -ENAMETOOLONG;
1989                 /* N.B. caller will free nfs_server.hostname in all cases */
1990                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1991                 if (!args->nfs_server.hostname)
1992                         goto out_nomem;
1993
1994                 c++;                    /* step over the ':' */
1995                 len = strlen(c);
1996                 if (len > NFS4_MAXPATHLEN)
1997                         return -ENAMETOOLONG;
1998                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1999                 if (!args->nfs_server.export_path)
2000                         goto out_nomem;
2001
2002                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
2003
2004                 if (args->client_address == NULL)
2005                         goto out_no_client_address;
2006
2007                 break;
2008                 }
2009         }
2010
2011         return 0;
2012
2013 out_no_data:
2014         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2015         return -EINVAL;
2016
2017 out_inval_auth:
2018         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2019                  data->auth_flavourlen);
2020         return -EINVAL;
2021
2022 out_nomem:
2023         dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
2024         return -ENOMEM;
2025
2026 out_no_address:
2027         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2028         return -EINVAL;
2029
2030 out_no_client_address:
2031         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2032         return -EINVAL;
2033 }
2034
2035 /*
2036  * Get the superblock for an NFS4 mountpoint
2037  */
2038 static int nfs4_get_sb(struct file_system_type *fs_type,
2039         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2040 {
2041         struct nfs_parsed_mount_data *data;
2042         struct super_block *s;
2043         struct nfs_server *server;
2044         struct nfs_fh *mntfh;
2045         struct dentry *mntroot;
2046         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2047         struct nfs_sb_mountdata sb_mntdata = {
2048                 .mntflags = flags,
2049         };
2050         int error = -ENOMEM;
2051
2052         data = kzalloc(sizeof(*data), GFP_KERNEL);
2053         mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2054         if (data == NULL || mntfh == NULL)
2055                 goto out_free_fh;
2056
2057         security_init_mnt_opts(&data->lsm_opts);
2058
2059         /* Validate the mount data */
2060         error = nfs4_validate_mount_data(raw_data, data, dev_name);
2061         if (error < 0)
2062                 goto out;
2063
2064         /* Get a volume representation */
2065         server = nfs4_create_server(data, mntfh);
2066         if (IS_ERR(server)) {
2067                 error = PTR_ERR(server);
2068                 goto out;
2069         }
2070         sb_mntdata.server = server;
2071
2072         if (server->flags & NFS4_MOUNT_UNSHARED)
2073                 compare_super = NULL;
2074
2075         /* Get a superblock - note that we may end up sharing one that already exists */
2076         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2077         if (IS_ERR(s)) {
2078                 error = PTR_ERR(s);
2079                 goto out_free;
2080         }
2081
2082         if (s->s_fs_info != server) {
2083                 nfs_free_server(server);
2084                 server = NULL;
2085         } else {
2086                 error = nfs_bdi_register(server);
2087                 if (error)
2088                         goto error_splat_super;
2089         }
2090
2091         if (!s->s_root) {
2092                 /* initial superblock/root creation */
2093                 nfs4_fill_super(s);
2094         }
2095
2096         mntroot = nfs4_get_root(s, mntfh);
2097         if (IS_ERR(mntroot)) {
2098                 error = PTR_ERR(mntroot);
2099                 goto error_splat_super;
2100         }
2101
2102         error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2103         if (error)
2104                 goto error_splat_root;
2105
2106         s->s_flags |= MS_ACTIVE;
2107         mnt->mnt_sb = s;
2108         mnt->mnt_root = mntroot;
2109         error = 0;
2110
2111 out:
2112         kfree(data->client_address);
2113         kfree(data->nfs_server.export_path);
2114         kfree(data->nfs_server.hostname);
2115         security_free_mnt_opts(&data->lsm_opts);
2116 out_free_fh:
2117         kfree(mntfh);
2118         kfree(data);
2119         return error;
2120
2121 out_free:
2122         nfs_free_server(server);
2123         goto out;
2124
2125 error_splat_root:
2126         dput(mntroot);
2127 error_splat_super:
2128         up_write(&s->s_umount);
2129         deactivate_super(s);
2130         goto out;
2131 }
2132
2133 static void nfs4_kill_super(struct super_block *sb)
2134 {
2135         struct nfs_server *server = NFS_SB(sb);
2136
2137         nfs_return_all_delegations(sb);
2138         kill_anon_super(sb);
2139
2140         nfs4_renewd_prepare_shutdown(server);
2141         nfs_free_server(server);
2142 }
2143
2144 /*
2145  * Clone an NFS4 server record on xdev traversal (FSID-change)
2146  */
2147 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2148                             const char *dev_name, void *raw_data,
2149                             struct vfsmount *mnt)
2150 {
2151         struct nfs_clone_mount *data = raw_data;
2152         struct super_block *s;
2153         struct nfs_server *server;
2154         struct dentry *mntroot;
2155         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2156         struct nfs_sb_mountdata sb_mntdata = {
2157                 .mntflags = flags,
2158         };
2159         int error;
2160
2161         dprintk("--> nfs4_xdev_get_sb()\n");
2162
2163         /* create a new volume representation */
2164         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2165         if (IS_ERR(server)) {
2166                 error = PTR_ERR(server);
2167                 goto out_err_noserver;
2168         }
2169         sb_mntdata.server = server;
2170
2171         if (server->flags & NFS4_MOUNT_UNSHARED)
2172                 compare_super = NULL;
2173
2174         /* Get a superblock - note that we may end up sharing one that already exists */
2175         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2176         if (IS_ERR(s)) {
2177                 error = PTR_ERR(s);
2178                 goto out_err_nosb;
2179         }
2180
2181         if (s->s_fs_info != server) {
2182                 nfs_free_server(server);
2183                 server = NULL;
2184         } else {
2185                 error = nfs_bdi_register(server);
2186                 if (error)
2187                         goto error_splat_super;
2188         }
2189
2190         if (!s->s_root) {
2191                 /* initial superblock/root creation */
2192                 nfs4_clone_super(s, data->sb);
2193         }
2194
2195         mntroot = nfs4_get_root(s, data->fh);
2196         if (IS_ERR(mntroot)) {
2197                 error = PTR_ERR(mntroot);
2198                 goto error_splat_super;
2199         }
2200         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2201                 dput(mntroot);
2202                 error = -ESTALE;
2203                 goto error_splat_super;
2204         }
2205
2206         s->s_flags |= MS_ACTIVE;
2207         mnt->mnt_sb = s;
2208         mnt->mnt_root = mntroot;
2209
2210         security_sb_clone_mnt_opts(data->sb, s);
2211
2212         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2213         return 0;
2214
2215 out_err_nosb:
2216         nfs_free_server(server);
2217 out_err_noserver:
2218         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2219         return error;
2220
2221 error_splat_super:
2222         up_write(&s->s_umount);
2223         deactivate_super(s);
2224         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2225         return error;
2226 }
2227
2228 /*
2229  * Create an NFS4 server record on referral traversal
2230  */
2231 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2232                                 const char *dev_name, void *raw_data,
2233                                 struct vfsmount *mnt)
2234 {
2235         struct nfs_clone_mount *data = raw_data;
2236         struct super_block *s;
2237         struct nfs_server *server;
2238         struct dentry *mntroot;
2239         struct nfs_fh mntfh;
2240         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2241         struct nfs_sb_mountdata sb_mntdata = {
2242                 .mntflags = flags,
2243         };
2244         int error;
2245
2246         dprintk("--> nfs4_referral_get_sb()\n");
2247
2248         /* create a new volume representation */
2249         server = nfs4_create_referral_server(data, &mntfh);
2250         if (IS_ERR(server)) {
2251                 error = PTR_ERR(server);
2252                 goto out_err_noserver;
2253         }
2254         sb_mntdata.server = server;
2255
2256         if (server->flags & NFS4_MOUNT_UNSHARED)
2257                 compare_super = NULL;
2258
2259         /* Get a superblock - note that we may end up sharing one that already exists */
2260         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2261         if (IS_ERR(s)) {
2262                 error = PTR_ERR(s);
2263                 goto out_err_nosb;
2264         }
2265
2266         if (s->s_fs_info != server) {
2267                 nfs_free_server(server);
2268                 server = NULL;
2269         } else {
2270                 error = nfs_bdi_register(server);
2271                 if (error)
2272                         goto error_splat_super;
2273         }
2274
2275         if (!s->s_root) {
2276                 /* initial superblock/root creation */
2277                 nfs4_fill_super(s);
2278         }
2279
2280         mntroot = nfs4_get_root(s, &mntfh);
2281         if (IS_ERR(mntroot)) {
2282                 error = PTR_ERR(mntroot);
2283                 goto error_splat_super;
2284         }
2285         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2286                 dput(mntroot);
2287                 error = -ESTALE;
2288                 goto error_splat_super;
2289         }
2290
2291         s->s_flags |= MS_ACTIVE;
2292         mnt->mnt_sb = s;
2293         mnt->mnt_root = mntroot;
2294
2295         security_sb_clone_mnt_opts(data->sb, s);
2296
2297         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2298         return 0;
2299
2300 out_err_nosb:
2301         nfs_free_server(server);
2302 out_err_noserver:
2303         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2304         return error;
2305
2306 error_splat_super:
2307         up_write(&s->s_umount);
2308         deactivate_super(s);
2309         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2310         return error;
2311 }
2312
2313 #endif /* CONFIG_NFS_V4 */