[PATCH] restore sane ->umount_begin() API
[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_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_soft, "soft" },
105         { Opt_hard, "hard" },
106         { Opt_intr, "intr" },
107         { Opt_nointr, "nointr" },
108         { Opt_posix, "posix" },
109         { Opt_noposix, "noposix" },
110         { Opt_cto, "cto" },
111         { Opt_nocto, "nocto" },
112         { Opt_ac, "ac" },
113         { Opt_noac, "noac" },
114         { Opt_lock, "lock" },
115         { Opt_nolock, "nolock" },
116         { Opt_v2, "v2" },
117         { Opt_v3, "v3" },
118         { Opt_udp, "udp" },
119         { Opt_tcp, "tcp" },
120         { Opt_rdma, "rdma" },
121         { Opt_acl, "acl" },
122         { Opt_noacl, "noacl" },
123         { Opt_rdirplus, "rdirplus" },
124         { Opt_nordirplus, "nordirplus" },
125         { Opt_sharecache, "sharecache" },
126         { Opt_nosharecache, "nosharecache" },
127
128         { Opt_port, "port=%u" },
129         { Opt_rsize, "rsize=%u" },
130         { Opt_wsize, "wsize=%u" },
131         { Opt_bsize, "bsize=%u" },
132         { Opt_timeo, "timeo=%u" },
133         { Opt_retrans, "retrans=%u" },
134         { Opt_acregmin, "acregmin=%u" },
135         { Opt_acregmax, "acregmax=%u" },
136         { Opt_acdirmin, "acdirmin=%u" },
137         { Opt_acdirmax, "acdirmax=%u" },
138         { Opt_actimeo, "actimeo=%u" },
139         { Opt_userspace, "retry=%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
211 static struct file_system_type nfs_fs_type = {
212         .owner          = THIS_MODULE,
213         .name           = "nfs",
214         .get_sb         = nfs_get_sb,
215         .kill_sb        = nfs_kill_super,
216         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
217 };
218
219 struct file_system_type nfs_xdev_fs_type = {
220         .owner          = THIS_MODULE,
221         .name           = "nfs",
222         .get_sb         = nfs_xdev_get_sb,
223         .kill_sb        = nfs_kill_super,
224         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
225 };
226
227 static const struct super_operations nfs_sops = {
228         .alloc_inode    = nfs_alloc_inode,
229         .destroy_inode  = nfs_destroy_inode,
230         .write_inode    = nfs_write_inode,
231         .put_super      = nfs_put_super,
232         .statfs         = nfs_statfs,
233         .clear_inode    = nfs_clear_inode,
234         .umount_begin   = nfs_umount_begin,
235         .show_options   = nfs_show_options,
236         .show_stats     = nfs_show_stats,
237 };
238
239 #ifdef CONFIG_NFS_V4
240 static int nfs4_get_sb(struct file_system_type *fs_type,
241         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
242 static int nfs4_xdev_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_referral_get_sb(struct file_system_type *fs_type,
245         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static void nfs4_kill_super(struct super_block *sb);
247
248 static struct file_system_type nfs4_fs_type = {
249         .owner          = THIS_MODULE,
250         .name           = "nfs4",
251         .get_sb         = nfs4_get_sb,
252         .kill_sb        = nfs4_kill_super,
253         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
254 };
255
256 struct file_system_type nfs4_xdev_fs_type = {
257         .owner          = THIS_MODULE,
258         .name           = "nfs4",
259         .get_sb         = nfs4_xdev_get_sb,
260         .kill_sb        = nfs4_kill_super,
261         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
262 };
263
264 struct file_system_type nfs4_referral_fs_type = {
265         .owner          = THIS_MODULE,
266         .name           = "nfs4",
267         .get_sb         = nfs4_referral_get_sb,
268         .kill_sb        = nfs4_kill_super,
269         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
270 };
271
272 static const struct super_operations nfs4_sops = {
273         .alloc_inode    = nfs_alloc_inode,
274         .destroy_inode  = nfs_destroy_inode,
275         .write_inode    = nfs_write_inode,
276         .statfs         = nfs_statfs,
277         .clear_inode    = nfs4_clear_inode,
278         .umount_begin   = nfs_umount_begin,
279         .show_options   = nfs_show_options,
280         .show_stats     = nfs_show_stats,
281 };
282 #endif
283
284 static struct shrinker acl_shrinker = {
285         .shrink         = nfs_access_cache_shrinker,
286         .seeks          = DEFAULT_SEEKS,
287 };
288
289 /*
290  * Register the NFS filesystems
291  */
292 int __init register_nfs_fs(void)
293 {
294         int ret;
295
296         ret = register_filesystem(&nfs_fs_type);
297         if (ret < 0)
298                 goto error_0;
299
300         ret = nfs_register_sysctl();
301         if (ret < 0)
302                 goto error_1;
303 #ifdef CONFIG_NFS_V4
304         ret = register_filesystem(&nfs4_fs_type);
305         if (ret < 0)
306                 goto error_2;
307 #endif
308         register_shrinker(&acl_shrinker);
309         return 0;
310
311 #ifdef CONFIG_NFS_V4
312 error_2:
313         nfs_unregister_sysctl();
314 #endif
315 error_1:
316         unregister_filesystem(&nfs_fs_type);
317 error_0:
318         return ret;
319 }
320
321 /*
322  * Unregister the NFS filesystems
323  */
324 void __exit unregister_nfs_fs(void)
325 {
326         unregister_shrinker(&acl_shrinker);
327 #ifdef CONFIG_NFS_V4
328         unregister_filesystem(&nfs4_fs_type);
329 #endif
330         nfs_unregister_sysctl();
331         unregister_filesystem(&nfs_fs_type);
332 }
333
334 void nfs_sb_active(struct nfs_server *server)
335 {
336         atomic_inc(&server->active);
337 }
338
339 void nfs_sb_deactive(struct nfs_server *server)
340 {
341         if (atomic_dec_and_test(&server->active))
342                 wake_up(&server->active_wq);
343 }
344
345 static void nfs_put_super(struct super_block *sb)
346 {
347         struct nfs_server *server = NFS_SB(sb);
348         /*
349          * Make sure there are no outstanding ops to this server.
350          * If so, wait for them to finish before allowing the
351          * unmount to continue.
352          */
353         wait_event(server->active_wq, atomic_read(&server->active) == 0);
354 }
355
356 /*
357  * Deliver file system statistics to userspace
358  */
359 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
360 {
361         struct nfs_server *server = NFS_SB(dentry->d_sb);
362         unsigned char blockbits;
363         unsigned long blockres;
364         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
365         struct nfs_fattr fattr;
366         struct nfs_fsstat res = {
367                         .fattr = &fattr,
368         };
369         int error;
370
371         lock_kernel();
372
373         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
374         if (error < 0)
375                 goto out_err;
376         buf->f_type = NFS_SUPER_MAGIC;
377
378         /*
379          * Current versions of glibc do not correctly handle the
380          * case where f_frsize != f_bsize.  Eventually we want to
381          * report the value of wtmult in this field.
382          */
383         buf->f_frsize = dentry->d_sb->s_blocksize;
384
385         /*
386          * On most *nix systems, f_blocks, f_bfree, and f_bavail
387          * are reported in units of f_frsize.  Linux hasn't had
388          * an f_frsize field in its statfs struct until recently,
389          * thus historically Linux's sys_statfs reports these
390          * fields in units of f_bsize.
391          */
392         buf->f_bsize = dentry->d_sb->s_blocksize;
393         blockbits = dentry->d_sb->s_blocksize_bits;
394         blockres = (1 << blockbits) - 1;
395         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
396         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
397         buf->f_bavail = (res.abytes + blockres) >> blockbits;
398
399         buf->f_files = res.tfiles;
400         buf->f_ffree = res.afiles;
401
402         buf->f_namelen = server->namelen;
403
404         unlock_kernel();
405         return 0;
406
407  out_err:
408         dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
409         unlock_kernel();
410         return error;
411 }
412
413 /*
414  * Map the security flavour number to a name
415  */
416 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
417 {
418         static const struct {
419                 rpc_authflavor_t flavour;
420                 const char *str;
421         } sec_flavours[] = {
422                 { RPC_AUTH_NULL, "null" },
423                 { RPC_AUTH_UNIX, "sys" },
424                 { RPC_AUTH_GSS_KRB5, "krb5" },
425                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
426                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
427                 { RPC_AUTH_GSS_LKEY, "lkey" },
428                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
429                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
430                 { RPC_AUTH_GSS_SPKM, "spkm" },
431                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
432                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
433                 { UINT_MAX, "unknown" }
434         };
435         int i;
436
437         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
438                 if (sec_flavours[i].flavour == flavour)
439                         break;
440         }
441         return sec_flavours[i].str;
442 }
443
444 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
445                                     int showdefaults)
446 {
447         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
448
449         switch (sap->sa_family) {
450         case AF_INET: {
451                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
452                 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
453                                 NIPQUAD(sin->sin_addr.s_addr));
454                 break;
455         }
456         case AF_INET6: {
457                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
458                 seq_printf(m, ",mountaddr=" NIP6_FMT,
459                                 NIP6(sin6->sin6_addr));
460                 break;
461         }
462         default:
463                 if (showdefaults)
464                         seq_printf(m, ",mountaddr=unspecified");
465         }
466
467         if (nfss->mountd_version || showdefaults)
468                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
469         if (nfss->mountd_port || showdefaults)
470                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
471
472         switch (nfss->mountd_protocol) {
473         case IPPROTO_UDP:
474                 seq_printf(m, ",mountproto=udp");
475                 break;
476         case IPPROTO_TCP:
477                 seq_printf(m, ",mountproto=tcp");
478                 break;
479         default:
480                 if (showdefaults)
481                         seq_printf(m, ",mountproto=auto");
482         }
483 }
484
485 /*
486  * Describe the mount options in force on this server representation
487  */
488 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
489                                    int showdefaults)
490 {
491         static const struct proc_nfs_info {
492                 int flag;
493                 const char *str;
494                 const char *nostr;
495         } nfs_info[] = {
496                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
497                 { NFS_MOUNT_INTR, ",intr", ",nointr" },
498                 { NFS_MOUNT_POSIX, ",posix", "" },
499                 { NFS_MOUNT_NOCTO, ",nocto", "" },
500                 { NFS_MOUNT_NOAC, ",noac", "" },
501                 { NFS_MOUNT_NONLM, ",nolock", "" },
502                 { NFS_MOUNT_NOACL, ",noacl", "" },
503                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
504                 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
505                 { 0, NULL, NULL }
506         };
507         const struct proc_nfs_info *nfs_infop;
508         struct nfs_client *clp = nfss->nfs_client;
509         u32 version = clp->rpc_ops->version;
510
511         seq_printf(m, ",vers=%u", version);
512         seq_printf(m, ",rsize=%u", nfss->rsize);
513         seq_printf(m, ",wsize=%u", nfss->wsize);
514         if (nfss->bsize != 0)
515                 seq_printf(m, ",bsize=%u", nfss->bsize);
516         seq_printf(m, ",namlen=%u", nfss->namelen);
517         if (nfss->acregmin != 3*HZ || showdefaults)
518                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
519         if (nfss->acregmax != 60*HZ || showdefaults)
520                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
521         if (nfss->acdirmin != 30*HZ || showdefaults)
522                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
523         if (nfss->acdirmax != 60*HZ || showdefaults)
524                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
525         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
526                 if (nfss->flags & nfs_infop->flag)
527                         seq_puts(m, nfs_infop->str);
528                 else
529                         seq_puts(m, nfs_infop->nostr);
530         }
531         seq_printf(m, ",proto=%s",
532                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
533         if (version == 4) {
534                 if (nfss->port != NFS_PORT)
535                         seq_printf(m, ",port=%u", nfss->port);
536         } else
537                 if (nfss->port)
538                         seq_printf(m, ",port=%u", nfss->port);
539
540         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
541         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
542         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
543
544         if (version != 4)
545                 nfs_show_mountd_options(m, nfss, showdefaults);
546
547 #ifdef CONFIG_NFS_V4
548         if (clp->rpc_ops->version == 4)
549                 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
550 #endif
551 }
552
553 /*
554  * Describe the mount options on this VFS mountpoint
555  */
556 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
557 {
558         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
559
560         nfs_show_mount_options(m, nfss, 0);
561
562         seq_printf(m, ",addr=%s",
563                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
564                                                         RPC_DISPLAY_ADDR));
565
566         return 0;
567 }
568
569 /*
570  * Present statistical information for this VFS mountpoint
571  */
572 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
573 {
574         int i, cpu;
575         struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
576         struct rpc_auth *auth = nfss->client->cl_auth;
577         struct nfs_iostats totals = { };
578
579         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
580
581         /*
582          * Display all mount option settings
583          */
584         seq_printf(m, "\n\topts:\t");
585         seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
586         seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
587         seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
588         seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
589         nfs_show_mount_options(m, nfss, 1);
590
591         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
592
593         seq_printf(m, "\n\tcaps:\t");
594         seq_printf(m, "caps=0x%x", nfss->caps);
595         seq_printf(m, ",wtmult=%u", nfss->wtmult);
596         seq_printf(m, ",dtsize=%u", nfss->dtsize);
597         seq_printf(m, ",bsize=%u", nfss->bsize);
598         seq_printf(m, ",namlen=%u", nfss->namelen);
599
600 #ifdef CONFIG_NFS_V4
601         if (nfss->nfs_client->rpc_ops->version == 4) {
602                 seq_printf(m, "\n\tnfsv4:\t");
603                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
604                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
605                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
606         }
607 #endif
608
609         /*
610          * Display security flavor in effect for this mount
611          */
612         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
613         if (auth->au_flavor)
614                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
615
616         /*
617          * Display superblock I/O counters
618          */
619         for_each_possible_cpu(cpu) {
620                 struct nfs_iostats *stats;
621
622                 preempt_disable();
623                 stats = per_cpu_ptr(nfss->io_stats, cpu);
624
625                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
626                         totals.events[i] += stats->events[i];
627                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
628                         totals.bytes[i] += stats->bytes[i];
629
630                 preempt_enable();
631         }
632
633         seq_printf(m, "\n\tevents:\t");
634         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
635                 seq_printf(m, "%lu ", totals.events[i]);
636         seq_printf(m, "\n\tbytes:\t");
637         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
638                 seq_printf(m, "%Lu ", totals.bytes[i]);
639         seq_printf(m, "\n");
640
641         rpc_print_iostats(m, nfss->client);
642
643         return 0;
644 }
645
646 /*
647  * Begin unmount by attempting to remove all automounted mountpoints we added
648  * in response to xdev traversals and referrals
649  */
650 static void nfs_umount_begin(struct super_block *sb)
651 {
652         struct nfs_server *server = NFS_SB(sb);
653         struct rpc_clnt *rpc;
654
655         /* -EIO all pending I/O */
656         rpc = server->client_acl;
657         if (!IS_ERR(rpc))
658                 rpc_killall_tasks(rpc);
659         rpc = server->client;
660         if (!IS_ERR(rpc))
661                 rpc_killall_tasks(rpc);
662 }
663
664 /*
665  * Set the port number in an address.  Be agnostic about the address family.
666  */
667 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
668 {
669         switch (sap->sa_family) {
670         case AF_INET: {
671                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
672                 ap->sin_port = htons(port);
673                 break;
674         }
675         case AF_INET6: {
676                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
677                 ap->sin6_port = htons(port);
678                 break;
679         }
680         }
681 }
682
683 /*
684  * Sanity-check a server address provided by the mount command.
685  *
686  * Address family must be initialized, and address must not be
687  * the ANY address for that family.
688  */
689 static int nfs_verify_server_address(struct sockaddr *addr)
690 {
691         switch (addr->sa_family) {
692         case AF_INET: {
693                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
694                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
695         }
696         case AF_INET6: {
697                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
698                 return !ipv6_addr_any(sa);
699         }
700         }
701
702         return 0;
703 }
704
705 /*
706  * Parse string addresses passed in via a mount option,
707  * and construct a sockaddr based on the result.
708  *
709  * If address parsing fails, set the sockaddr's address
710  * family to AF_UNSPEC to force nfs_verify_server_address()
711  * to punt the mount.
712  */
713 static void nfs_parse_server_address(char *value,
714                                      struct sockaddr *sap,
715                                      size_t *len)
716 {
717         if (strchr(value, ':')) {
718                 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
719                 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
720
721                 ap->sin6_family = AF_INET6;
722                 *len = sizeof(*ap);
723                 if (in6_pton(value, -1, addr, '\0', NULL))
724                         return;
725         } else {
726                 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
727                 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
728
729                 ap->sin_family = AF_INET;
730                 *len = sizeof(*ap);
731                 if (in4_pton(value, -1, addr, '\0', NULL))
732                         return;
733         }
734
735         sap->sa_family = AF_UNSPEC;
736         *len = 0;
737 }
738
739 /*
740  * Error-check and convert a string of mount options from user space into
741  * a data structure
742  */
743 static int nfs_parse_mount_options(char *raw,
744                                    struct nfs_parsed_mount_data *mnt)
745 {
746         char *p, *string, *secdata;
747         int rc;
748
749         if (!raw) {
750                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
751                 return 1;
752         }
753         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
754
755         secdata = alloc_secdata();
756         if (!secdata)
757                 goto out_nomem;
758
759         rc = security_sb_copy_data(raw, secdata);
760         if (rc)
761                 goto out_security_failure;
762
763         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
764         if (rc)
765                 goto out_security_failure;
766
767         free_secdata(secdata);
768
769         while ((p = strsep(&raw, ",")) != NULL) {
770                 substring_t args[MAX_OPT_ARGS];
771                 int option, token;
772
773                 if (!*p)
774                         continue;
775
776                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
777
778                 token = match_token(p, nfs_mount_option_tokens, args);
779                 switch (token) {
780                 case Opt_soft:
781                         mnt->flags |= NFS_MOUNT_SOFT;
782                         break;
783                 case Opt_hard:
784                         mnt->flags &= ~NFS_MOUNT_SOFT;
785                         break;
786                 case Opt_intr:
787                 case Opt_nointr:
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                         break;
1105
1106                 default:
1107                         goto out_unknown;
1108                 }
1109         }
1110
1111         nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1112                                 mnt->nfs_server.port);
1113
1114         return 1;
1115
1116 out_nomem:
1117         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1118         return 0;
1119 out_security_failure:
1120         free_secdata(secdata);
1121         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1122         return 0;
1123 out_unrec_vers:
1124         printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1125         return 0;
1126
1127 out_unrec_xprt:
1128         printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1129         return 0;
1130
1131 out_unrec_sec:
1132         printk(KERN_INFO "NFS: unrecognized security flavor\n");
1133         return 0;
1134
1135 out_unknown:
1136         printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1137         return 0;
1138 }
1139
1140 /*
1141  * Use the remote server's MOUNT service to request the NFS file handle
1142  * corresponding to the provided path.
1143  */
1144 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1145                          struct nfs_fh *root_fh)
1146 {
1147         struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1148         char *hostname;
1149         int status;
1150
1151         if (args->mount_server.version == 0) {
1152                 if (args->flags & NFS_MOUNT_VER3)
1153                         args->mount_server.version = NFS_MNT3_VERSION;
1154                 else
1155                         args->mount_server.version = NFS_MNT_VERSION;
1156         }
1157
1158         if (args->mount_server.hostname)
1159                 hostname = args->mount_server.hostname;
1160         else
1161                 hostname = args->nfs_server.hostname;
1162
1163         /*
1164          * Construct the mount server's address.
1165          */
1166         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1167                 memcpy(sap, &args->nfs_server.address,
1168                        args->nfs_server.addrlen);
1169                 args->mount_server.addrlen = args->nfs_server.addrlen;
1170         }
1171
1172         /*
1173          * autobind will be used if mount_server.port == 0
1174          */
1175         nfs_set_port(sap, args->mount_server.port);
1176
1177         /*
1178          * Now ask the mount server to map our export path
1179          * to a file handle.
1180          */
1181         status = nfs_mount(sap,
1182                            args->mount_server.addrlen,
1183                            hostname,
1184                            args->nfs_server.export_path,
1185                            args->mount_server.version,
1186                            args->mount_server.protocol,
1187                            root_fh);
1188         if (status == 0)
1189                 return 0;
1190
1191         dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1192                         hostname, status);
1193         return status;
1194 }
1195
1196 /*
1197  * Validate the NFS2/NFS3 mount data
1198  * - fills in the mount root filehandle
1199  *
1200  * For option strings, user space handles the following behaviors:
1201  *
1202  * + DNS: mapping server host name to IP address ("addr=" option)
1203  *
1204  * + failure mode: how to behave if a mount request can't be handled
1205  *   immediately ("fg/bg" option)
1206  *
1207  * + retry: how often to retry a mount request ("retry=" option)
1208  *
1209  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1210  *   mountproto=tcp after mountproto=udp, and so on
1211  */
1212 static int nfs_validate_mount_data(void *options,
1213                                    struct nfs_parsed_mount_data *args,
1214                                    struct nfs_fh *mntfh,
1215                                    const char *dev_name)
1216 {
1217         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1218
1219         memset(args, 0, sizeof(*args));
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                         mntfh->size = data->root.size;
1256                 else
1257                         mntfh->size = NFS2_FHSIZE;
1258
1259                 if (mntfh->size > sizeof(mntfh->data))
1260                         goto out_invalid_fh;
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 /*
1402  * Initialise the common bits of the superblock
1403  */
1404 static inline void nfs_initialise_sb(struct super_block *sb)
1405 {
1406         struct nfs_server *server = NFS_SB(sb);
1407
1408         sb->s_magic = NFS_SUPER_MAGIC;
1409
1410         /* We probably want something more informative here */
1411         snprintf(sb->s_id, sizeof(sb->s_id),
1412                  "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1413
1414         if (sb->s_blocksize == 0)
1415                 sb->s_blocksize = nfs_block_bits(server->wsize,
1416                                                  &sb->s_blocksize_bits);
1417
1418         if (server->flags & NFS_MOUNT_NOAC)
1419                 sb->s_flags |= MS_SYNCHRONOUS;
1420
1421         nfs_super_set_maxbytes(sb, server->maxfilesize);
1422 }
1423
1424 /*
1425  * Finish setting up an NFS2/3 superblock
1426  */
1427 static void nfs_fill_super(struct super_block *sb,
1428                            struct nfs_parsed_mount_data *data)
1429 {
1430         struct nfs_server *server = NFS_SB(sb);
1431
1432         sb->s_blocksize_bits = 0;
1433         sb->s_blocksize = 0;
1434         if (data->bsize)
1435                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1436
1437         if (server->flags & NFS_MOUNT_VER3) {
1438                 /* The VFS shouldn't apply the umask to mode bits. We will do
1439                  * so ourselves when necessary.
1440                  */
1441                 sb->s_flags |= MS_POSIXACL;
1442                 sb->s_time_gran = 1;
1443         }
1444
1445         sb->s_op = &nfs_sops;
1446         nfs_initialise_sb(sb);
1447 }
1448
1449 /*
1450  * Finish setting up a cloned NFS2/3 superblock
1451  */
1452 static void nfs_clone_super(struct super_block *sb,
1453                             const struct super_block *old_sb)
1454 {
1455         struct nfs_server *server = NFS_SB(sb);
1456
1457         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1458         sb->s_blocksize = old_sb->s_blocksize;
1459         sb->s_maxbytes = old_sb->s_maxbytes;
1460
1461         if (server->flags & NFS_MOUNT_VER3) {
1462                 /* The VFS shouldn't apply the umask to mode bits. We will do
1463                  * so ourselves when necessary.
1464                  */
1465                 sb->s_flags |= MS_POSIXACL;
1466                 sb->s_time_gran = 1;
1467         }
1468
1469         sb->s_op = old_sb->s_op;
1470         nfs_initialise_sb(sb);
1471 }
1472
1473 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1474
1475 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1476 {
1477         const struct nfs_server *a = s->s_fs_info;
1478         const struct rpc_clnt *clnt_a = a->client;
1479         const struct rpc_clnt *clnt_b = b->client;
1480
1481         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1482                 goto Ebusy;
1483         if (a->nfs_client != b->nfs_client)
1484                 goto Ebusy;
1485         if (a->flags != b->flags)
1486                 goto Ebusy;
1487         if (a->wsize != b->wsize)
1488                 goto Ebusy;
1489         if (a->rsize != b->rsize)
1490                 goto Ebusy;
1491         if (a->acregmin != b->acregmin)
1492                 goto Ebusy;
1493         if (a->acregmax != b->acregmax)
1494                 goto Ebusy;
1495         if (a->acdirmin != b->acdirmin)
1496                 goto Ebusy;
1497         if (a->acdirmax != b->acdirmax)
1498                 goto Ebusy;
1499         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1500                 goto Ebusy;
1501         return 1;
1502 Ebusy:
1503         return 0;
1504 }
1505
1506 struct nfs_sb_mountdata {
1507         struct nfs_server *server;
1508         int mntflags;
1509 };
1510
1511 static int nfs_set_super(struct super_block *s, void *data)
1512 {
1513         struct nfs_sb_mountdata *sb_mntdata = data;
1514         struct nfs_server *server = sb_mntdata->server;
1515         int ret;
1516
1517         s->s_flags = sb_mntdata->mntflags;
1518         s->s_fs_info = server;
1519         ret = set_anon_super(s, server);
1520         if (ret == 0)
1521                 server->s_dev = s->s_dev;
1522         return ret;
1523 }
1524
1525 static int nfs_compare_super_address(struct nfs_server *server1,
1526                                      struct nfs_server *server2)
1527 {
1528         struct sockaddr *sap1, *sap2;
1529
1530         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1531         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1532
1533         if (sap1->sa_family != sap2->sa_family)
1534                 return 0;
1535
1536         switch (sap1->sa_family) {
1537         case AF_INET: {
1538                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1539                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1540                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1541                         return 0;
1542                 if (sin1->sin_port != sin2->sin_port)
1543                         return 0;
1544                 break;
1545         }
1546         case AF_INET6: {
1547                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1548                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1549                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1550                         return 0;
1551                 if (sin1->sin6_port != sin2->sin6_port)
1552                         return 0;
1553                 break;
1554         }
1555         default:
1556                 return 0;
1557         }
1558
1559         return 1;
1560 }
1561
1562 static int nfs_compare_super(struct super_block *sb, void *data)
1563 {
1564         struct nfs_sb_mountdata *sb_mntdata = data;
1565         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1566         int mntflags = sb_mntdata->mntflags;
1567
1568         if (!nfs_compare_super_address(old, server))
1569                 return 0;
1570         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1571         if (old->flags & NFS_MOUNT_UNSHARED)
1572                 return 0;
1573         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1574                 return 0;
1575         return nfs_compare_mount_options(sb, server, mntflags);
1576 }
1577
1578 static int nfs_get_sb(struct file_system_type *fs_type,
1579         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1580 {
1581         struct nfs_server *server = NULL;
1582         struct super_block *s;
1583         struct nfs_fh mntfh;
1584         struct nfs_parsed_mount_data data;
1585         struct dentry *mntroot;
1586         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1587         struct nfs_sb_mountdata sb_mntdata = {
1588                 .mntflags = flags,
1589         };
1590         int error;
1591
1592         security_init_mnt_opts(&data.lsm_opts);
1593
1594         /* Validate the mount data */
1595         error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1596         if (error < 0)
1597                 goto out;
1598
1599         /* Get a volume representation */
1600         server = nfs_create_server(&data, &mntfh);
1601         if (IS_ERR(server)) {
1602                 error = PTR_ERR(server);
1603                 goto out;
1604         }
1605         sb_mntdata.server = server;
1606
1607         if (server->flags & NFS_MOUNT_UNSHARED)
1608                 compare_super = NULL;
1609
1610         /* Get a superblock - note that we may end up sharing one that already exists */
1611         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1612         if (IS_ERR(s)) {
1613                 error = PTR_ERR(s);
1614                 goto out_err_nosb;
1615         }
1616
1617         if (s->s_fs_info != server) {
1618                 nfs_free_server(server);
1619                 server = NULL;
1620         }
1621
1622         if (!s->s_root) {
1623                 /* initial superblock/root creation */
1624                 nfs_fill_super(s, &data);
1625         }
1626
1627         mntroot = nfs_get_root(s, &mntfh);
1628         if (IS_ERR(mntroot)) {
1629                 error = PTR_ERR(mntroot);
1630                 goto error_splat_super;
1631         }
1632
1633         error = security_sb_set_mnt_opts(s, &data.lsm_opts);
1634         if (error)
1635                 goto error_splat_root;
1636
1637         s->s_flags |= MS_ACTIVE;
1638         mnt->mnt_sb = s;
1639         mnt->mnt_root = mntroot;
1640         error = 0;
1641
1642 out:
1643         kfree(data.nfs_server.hostname);
1644         kfree(data.mount_server.hostname);
1645         security_free_mnt_opts(&data.lsm_opts);
1646         return error;
1647
1648 out_err_nosb:
1649         nfs_free_server(server);
1650         goto out;
1651
1652 error_splat_root:
1653         dput(mntroot);
1654 error_splat_super:
1655         up_write(&s->s_umount);
1656         deactivate_super(s);
1657         goto out;
1658 }
1659
1660 /*
1661  * Destroy an NFS2/3 superblock
1662  */
1663 static void nfs_kill_super(struct super_block *s)
1664 {
1665         struct nfs_server *server = NFS_SB(s);
1666
1667         kill_anon_super(s);
1668         nfs_free_server(server);
1669 }
1670
1671 /*
1672  * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1673  */
1674 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1675                            const char *dev_name, void *raw_data,
1676                            struct vfsmount *mnt)
1677 {
1678         struct nfs_clone_mount *data = raw_data;
1679         struct super_block *s;
1680         struct nfs_server *server;
1681         struct dentry *mntroot;
1682         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1683         struct nfs_sb_mountdata sb_mntdata = {
1684                 .mntflags = flags,
1685         };
1686         int error;
1687
1688         dprintk("--> nfs_xdev_get_sb()\n");
1689
1690         /* create a new volume representation */
1691         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1692         if (IS_ERR(server)) {
1693                 error = PTR_ERR(server);
1694                 goto out_err_noserver;
1695         }
1696         sb_mntdata.server = server;
1697
1698         if (server->flags & NFS_MOUNT_UNSHARED)
1699                 compare_super = NULL;
1700
1701         /* Get a superblock - note that we may end up sharing one that already exists */
1702         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1703         if (IS_ERR(s)) {
1704                 error = PTR_ERR(s);
1705                 goto out_err_nosb;
1706         }
1707
1708         if (s->s_fs_info != server) {
1709                 nfs_free_server(server);
1710                 server = NULL;
1711         }
1712
1713         if (!s->s_root) {
1714                 /* initial superblock/root creation */
1715                 nfs_clone_super(s, data->sb);
1716         }
1717
1718         mntroot = nfs_get_root(s, data->fh);
1719         if (IS_ERR(mntroot)) {
1720                 error = PTR_ERR(mntroot);
1721                 goto error_splat_super;
1722         }
1723         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1724                 dput(mntroot);
1725                 error = -ESTALE;
1726                 goto error_splat_super;
1727         }
1728
1729         s->s_flags |= MS_ACTIVE;
1730         mnt->mnt_sb = s;
1731         mnt->mnt_root = mntroot;
1732
1733         /* clone any lsm security options from the parent to the new sb */
1734         security_sb_clone_mnt_opts(data->sb, s);
1735
1736         dprintk("<-- nfs_xdev_get_sb() = 0\n");
1737         return 0;
1738
1739 out_err_nosb:
1740         nfs_free_server(server);
1741 out_err_noserver:
1742         dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1743         return error;
1744
1745 error_splat_super:
1746         up_write(&s->s_umount);
1747         deactivate_super(s);
1748         dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1749         return error;
1750 }
1751
1752 #ifdef CONFIG_NFS_V4
1753
1754 /*
1755  * Finish setting up a cloned NFS4 superblock
1756  */
1757 static void nfs4_clone_super(struct super_block *sb,
1758                             const struct super_block *old_sb)
1759 {
1760         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1761         sb->s_blocksize = old_sb->s_blocksize;
1762         sb->s_maxbytes = old_sb->s_maxbytes;
1763         sb->s_time_gran = 1;
1764         sb->s_op = old_sb->s_op;
1765         nfs_initialise_sb(sb);
1766 }
1767
1768 /*
1769  * Set up an NFS4 superblock
1770  */
1771 static void nfs4_fill_super(struct super_block *sb)
1772 {
1773         sb->s_time_gran = 1;
1774         sb->s_op = &nfs4_sops;
1775         nfs_initialise_sb(sb);
1776 }
1777
1778 /*
1779  * Validate NFSv4 mount options
1780  */
1781 static int nfs4_validate_mount_data(void *options,
1782                                     struct nfs_parsed_mount_data *args,
1783                                     const char *dev_name)
1784 {
1785         struct sockaddr_in *ap;
1786         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1787         char *c;
1788
1789         memset(args, 0, sizeof(*args));
1790
1791         if (data == NULL)
1792                 goto out_no_data;
1793
1794         args->rsize             = NFS_MAX_FILE_IO_SIZE;
1795         args->wsize             = NFS_MAX_FILE_IO_SIZE;
1796         args->timeo             = 600;
1797         args->retrans           = 2;
1798         args->acregmin          = 3;
1799         args->acregmax          = 60;
1800         args->acdirmin          = 30;
1801         args->acdirmax          = 60;
1802         args->nfs_server.port   = NFS_PORT; /* 2049 unless user set port= */
1803         args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1804
1805         switch (data->version) {
1806         case 1:
1807                 ap = (struct sockaddr_in *)&args->nfs_server.address;
1808                 if (data->host_addrlen > sizeof(args->nfs_server.address))
1809                         goto out_no_address;
1810                 if (data->host_addrlen == 0)
1811                         goto out_no_address;
1812                 args->nfs_server.addrlen = data->host_addrlen;
1813                 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1814                         return -EFAULT;
1815                 if (!nfs_verify_server_address((struct sockaddr *)
1816                                                 &args->nfs_server.address))
1817                         goto out_no_address;
1818
1819                 switch (data->auth_flavourlen) {
1820                 case 0:
1821                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1822                         break;
1823                 case 1:
1824                         if (copy_from_user(&args->auth_flavors[0],
1825                                            data->auth_flavours,
1826                                            sizeof(args->auth_flavors[0])))
1827                                 return -EFAULT;
1828                         break;
1829                 default:
1830                         goto out_inval_auth;
1831                 }
1832
1833                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1834                 if (IS_ERR(c))
1835                         return PTR_ERR(c);
1836                 args->nfs_server.hostname = c;
1837
1838                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1839                 if (IS_ERR(c))
1840                         return PTR_ERR(c);
1841                 args->nfs_server.export_path = c;
1842                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1843
1844                 c = strndup_user(data->client_addr.data, 16);
1845                 if (IS_ERR(c))
1846                         return PTR_ERR(c);
1847                 args->client_address = c;
1848
1849                 /*
1850                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1851                  * can deal with.
1852                  */
1853
1854                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
1855                 args->rsize     = data->rsize;
1856                 args->wsize     = data->wsize;
1857                 args->timeo     = data->timeo;
1858                 args->retrans   = data->retrans;
1859                 args->acregmin  = data->acregmin;
1860                 args->acregmax  = data->acregmax;
1861                 args->acdirmin  = data->acdirmin;
1862                 args->acdirmax  = data->acdirmax;
1863                 args->nfs_server.protocol = data->proto;
1864
1865                 break;
1866         default: {
1867                 unsigned int len;
1868
1869                 if (nfs_parse_mount_options((char *)options, args) == 0)
1870                         return -EINVAL;
1871
1872                 if (!nfs_verify_server_address((struct sockaddr *)
1873                                                 &args->nfs_server.address))
1874                         return -EINVAL;
1875
1876                 switch (args->auth_flavor_len) {
1877                 case 0:
1878                         args->auth_flavors[0] = RPC_AUTH_UNIX;
1879                         break;
1880                 case 1:
1881                         break;
1882                 default:
1883                         goto out_inval_auth;
1884                 }
1885
1886                 /*
1887                  * Split "dev_name" into "hostname:mntpath".
1888                  */
1889                 c = strchr(dev_name, ':');
1890                 if (c == NULL)
1891                         return -EINVAL;
1892                 /* while calculating len, pretend ':' is '\0' */
1893                 len = c - dev_name;
1894                 if (len > NFS4_MAXNAMLEN)
1895                         return -ENAMETOOLONG;
1896                 /* N.B. caller will free nfs_server.hostname in all cases */
1897                 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1898                 if (!args->nfs_server.hostname)
1899                         goto out_nomem;
1900
1901                 c++;                    /* step over the ':' */
1902                 len = strlen(c);
1903                 if (len > NFS4_MAXPATHLEN)
1904                         return -ENAMETOOLONG;
1905                 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1906                 if (!args->nfs_server.export_path)
1907                         goto out_nomem;
1908
1909                 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1910
1911                 if (args->client_address == NULL)
1912                         goto out_no_client_address;
1913
1914                 break;
1915                 }
1916         }
1917
1918         return 0;
1919
1920 out_no_data:
1921         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1922         return -EINVAL;
1923
1924 out_inval_auth:
1925         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1926                  data->auth_flavourlen);
1927         return -EINVAL;
1928
1929 out_nomem:
1930         dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
1931         return -ENOMEM;
1932
1933 out_no_address:
1934         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1935         return -EINVAL;
1936
1937 out_no_client_address:
1938         dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1939         return -EINVAL;
1940 }
1941
1942 /*
1943  * Get the superblock for an NFS4 mountpoint
1944  */
1945 static int nfs4_get_sb(struct file_system_type *fs_type,
1946         int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1947 {
1948         struct nfs_parsed_mount_data data;
1949         struct super_block *s;
1950         struct nfs_server *server;
1951         struct nfs_fh mntfh;
1952         struct dentry *mntroot;
1953         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1954         struct nfs_sb_mountdata sb_mntdata = {
1955                 .mntflags = flags,
1956         };
1957         int error;
1958
1959         security_init_mnt_opts(&data.lsm_opts);
1960
1961         /* Validate the mount data */
1962         error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1963         if (error < 0)
1964                 goto out;
1965
1966         /* Get a volume representation */
1967         server = nfs4_create_server(&data, &mntfh);
1968         if (IS_ERR(server)) {
1969                 error = PTR_ERR(server);
1970                 goto out;
1971         }
1972         sb_mntdata.server = server;
1973
1974         if (server->flags & NFS4_MOUNT_UNSHARED)
1975                 compare_super = NULL;
1976
1977         /* Get a superblock - note that we may end up sharing one that already exists */
1978         s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1979         if (IS_ERR(s)) {
1980                 error = PTR_ERR(s);
1981                 goto out_free;
1982         }
1983
1984         if (s->s_fs_info != server) {
1985                 nfs_free_server(server);
1986                 server = NULL;
1987         }
1988
1989         if (!s->s_root) {
1990                 /* initial superblock/root creation */
1991                 nfs4_fill_super(s);
1992         }
1993
1994         mntroot = nfs4_get_root(s, &mntfh);
1995         if (IS_ERR(mntroot)) {
1996                 error = PTR_ERR(mntroot);
1997                 goto error_splat_super;
1998         }
1999
2000         s->s_flags |= MS_ACTIVE;
2001         mnt->mnt_sb = s;
2002         mnt->mnt_root = mntroot;
2003         error = 0;
2004
2005 out:
2006         kfree(data.client_address);
2007         kfree(data.nfs_server.export_path);
2008         kfree(data.nfs_server.hostname);
2009         security_free_mnt_opts(&data.lsm_opts);
2010         return error;
2011
2012 out_free:
2013         nfs_free_server(server);
2014         goto out;
2015
2016 error_splat_super:
2017         up_write(&s->s_umount);
2018         deactivate_super(s);
2019         goto out;
2020 }
2021
2022 static void nfs4_kill_super(struct super_block *sb)
2023 {
2024         struct nfs_server *server = NFS_SB(sb);
2025
2026         nfs_return_all_delegations(sb);
2027         kill_anon_super(sb);
2028
2029         nfs4_renewd_prepare_shutdown(server);
2030         nfs_free_server(server);
2031 }
2032
2033 /*
2034  * Clone an NFS4 server record on xdev traversal (FSID-change)
2035  */
2036 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2037                             const char *dev_name, void *raw_data,
2038                             struct vfsmount *mnt)
2039 {
2040         struct nfs_clone_mount *data = raw_data;
2041         struct super_block *s;
2042         struct nfs_server *server;
2043         struct dentry *mntroot;
2044         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2045         struct nfs_sb_mountdata sb_mntdata = {
2046                 .mntflags = flags,
2047         };
2048         int error;
2049
2050         dprintk("--> nfs4_xdev_get_sb()\n");
2051
2052         /* create a new volume representation */
2053         server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2054         if (IS_ERR(server)) {
2055                 error = PTR_ERR(server);
2056                 goto out_err_noserver;
2057         }
2058         sb_mntdata.server = server;
2059
2060         if (server->flags & NFS4_MOUNT_UNSHARED)
2061                 compare_super = NULL;
2062
2063         /* Get a superblock - note that we may end up sharing one that already exists */
2064         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2065         if (IS_ERR(s)) {
2066                 error = PTR_ERR(s);
2067                 goto out_err_nosb;
2068         }
2069
2070         if (s->s_fs_info != server) {
2071                 nfs_free_server(server);
2072                 server = NULL;
2073         }
2074
2075         if (!s->s_root) {
2076                 /* initial superblock/root creation */
2077                 nfs4_clone_super(s, data->sb);
2078         }
2079
2080         mntroot = nfs4_get_root(s, data->fh);
2081         if (IS_ERR(mntroot)) {
2082                 error = PTR_ERR(mntroot);
2083                 goto error_splat_super;
2084         }
2085         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2086                 dput(mntroot);
2087                 error = -ESTALE;
2088                 goto error_splat_super;
2089         }
2090
2091         s->s_flags |= MS_ACTIVE;
2092         mnt->mnt_sb = s;
2093         mnt->mnt_root = mntroot;
2094
2095         dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2096         return 0;
2097
2098 out_err_nosb:
2099         nfs_free_server(server);
2100 out_err_noserver:
2101         dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2102         return error;
2103
2104 error_splat_super:
2105         up_write(&s->s_umount);
2106         deactivate_super(s);
2107         dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2108         return error;
2109 }
2110
2111 /*
2112  * Create an NFS4 server record on referral traversal
2113  */
2114 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2115                                 const char *dev_name, void *raw_data,
2116                                 struct vfsmount *mnt)
2117 {
2118         struct nfs_clone_mount *data = raw_data;
2119         struct super_block *s;
2120         struct nfs_server *server;
2121         struct dentry *mntroot;
2122         struct nfs_fh mntfh;
2123         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2124         struct nfs_sb_mountdata sb_mntdata = {
2125                 .mntflags = flags,
2126         };
2127         int error;
2128
2129         dprintk("--> nfs4_referral_get_sb()\n");
2130
2131         /* create a new volume representation */
2132         server = nfs4_create_referral_server(data, &mntfh);
2133         if (IS_ERR(server)) {
2134                 error = PTR_ERR(server);
2135                 goto out_err_noserver;
2136         }
2137         sb_mntdata.server = server;
2138
2139         if (server->flags & NFS4_MOUNT_UNSHARED)
2140                 compare_super = NULL;
2141
2142         /* Get a superblock - note that we may end up sharing one that already exists */
2143         s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2144         if (IS_ERR(s)) {
2145                 error = PTR_ERR(s);
2146                 goto out_err_nosb;
2147         }
2148
2149         if (s->s_fs_info != server) {
2150                 nfs_free_server(server);
2151                 server = NULL;
2152         }
2153
2154         if (!s->s_root) {
2155                 /* initial superblock/root creation */
2156                 nfs4_fill_super(s);
2157         }
2158
2159         mntroot = nfs4_get_root(s, &mntfh);
2160         if (IS_ERR(mntroot)) {
2161                 error = PTR_ERR(mntroot);
2162                 goto error_splat_super;
2163         }
2164         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2165                 dput(mntroot);
2166                 error = -ESTALE;
2167                 goto error_splat_super;
2168         }
2169
2170         s->s_flags |= MS_ACTIVE;
2171         mnt->mnt_sb = s;
2172         mnt->mnt_root = mntroot;
2173
2174         dprintk("<-- nfs4_referral_get_sb() = 0\n");
2175         return 0;
2176
2177 out_err_nosb:
2178         nfs_free_server(server);
2179 out_err_noserver:
2180         dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2181         return error;
2182
2183 error_splat_super:
2184         up_write(&s->s_umount);
2185         deactivate_super(s);
2186         dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2187         return error;
2188 }
2189
2190 #endif /* CONFIG_NFS_V4 */