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TOMOYO Linux Cross Reference
Linux/fs/nfs/super.c

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  1 /*
  2  *  linux/fs/nfs/super.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  *
  6  *  nfs superblock handling functions
  7  *
  8  *  Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
  9  *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 10  *
 11  *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 12  *  J.S.Peatfield@damtp.cam.ac.uk
 13  *
 14  *  Split from inode.c by David Howells <dhowells@redhat.com>
 15  *
 16  * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
 17  *   particular server are held in the same superblock
 18  * - NFS superblocks can have several effective roots to the dentry tree
 19  * - directory type roots are spliced into the tree when a path from one root reaches the root
 20  *   of another (see nfs_lookup())
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/init.h>
 25 
 26 #include <linux/time.h>
 27 #include <linux/kernel.h>
 28 #include <linux/mm.h>
 29 #include <linux/string.h>
 30 #include <linux/stat.h>
 31 #include <linux/errno.h>
 32 #include <linux/unistd.h>
 33 #include <linux/sunrpc/clnt.h>
 34 #include <linux/sunrpc/addr.h>
 35 #include <linux/sunrpc/stats.h>
 36 #include <linux/sunrpc/metrics.h>
 37 #include <linux/sunrpc/xprtsock.h>
 38 #include <linux/sunrpc/xprtrdma.h>
 39 #include <linux/nfs_fs.h>
 40 #include <linux/nfs_mount.h>
 41 #include <linux/nfs4_mount.h>
 42 #include <linux/lockd/bind.h>
 43 #include <linux/seq_file.h>
 44 #include <linux/mount.h>
 45 #include <linux/namei.h>
 46 #include <linux/nfs_idmap.h>
 47 #include <linux/vfs.h>
 48 #include <linux/inet.h>
 49 #include <linux/in6.h>
 50 #include <linux/slab.h>
 51 #include <net/ipv6.h>
 52 #include <linux/netdevice.h>
 53 #include <linux/nfs_xdr.h>
 54 #include <linux/magic.h>
 55 #include <linux/parser.h>
 56 #include <linux/nsproxy.h>
 57 #include <linux/rcupdate.h>
 58 
 59 #include <asm/uaccess.h>
 60 
 61 #include "nfs4_fs.h"
 62 #include "callback.h"
 63 #include "delegation.h"
 64 #include "iostat.h"
 65 #include "internal.h"
 66 #include "fscache.h"
 67 #include "nfs4session.h"
 68 #include "pnfs.h"
 69 #include "nfs.h"
 70 
 71 #define NFSDBG_FACILITY         NFSDBG_VFS
 72 #define NFS_TEXT_DATA           1
 73 
 74 #if IS_ENABLED(CONFIG_NFS_V3)
 75 #define NFS_DEFAULT_VERSION 3
 76 #else
 77 #define NFS_DEFAULT_VERSION 2
 78 #endif
 79 
 80 enum {
 81         /* Mount options that take no arguments */
 82         Opt_soft, Opt_hard,
 83         Opt_posix, Opt_noposix,
 84         Opt_cto, Opt_nocto,
 85         Opt_ac, Opt_noac,
 86         Opt_lock, Opt_nolock,
 87         Opt_udp, Opt_tcp, Opt_rdma,
 88         Opt_acl, Opt_noacl,
 89         Opt_rdirplus, Opt_nordirplus,
 90         Opt_sharecache, Opt_nosharecache,
 91         Opt_resvport, Opt_noresvport,
 92         Opt_fscache, Opt_nofscache,
 93         Opt_migration, Opt_nomigration,
 94 
 95         /* Mount options that take integer arguments */
 96         Opt_port,
 97         Opt_rsize, Opt_wsize, Opt_bsize,
 98         Opt_timeo, Opt_retrans,
 99         Opt_acregmin, Opt_acregmax,
100         Opt_acdirmin, Opt_acdirmax,
101         Opt_actimeo,
102         Opt_namelen,
103         Opt_mountport,
104         Opt_mountvers,
105         Opt_minorversion,
106 
107         /* Mount options that take string arguments */
108         Opt_nfsvers,
109         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110         Opt_addr, Opt_mountaddr, Opt_clientaddr,
111         Opt_lookupcache,
112         Opt_fscache_uniq,
113         Opt_local_lock,
114 
115         /* Special mount options */
116         Opt_userspace, Opt_deprecated, Opt_sloppy,
117 
118         Opt_err
119 };
120 
121 static const match_table_t nfs_mount_option_tokens = {
122         { Opt_userspace, "bg" },
123         { Opt_userspace, "fg" },
124         { Opt_userspace, "retry=%s" },
125 
126         { Opt_sloppy, "sloppy" },
127 
128         { Opt_soft, "soft" },
129         { Opt_hard, "hard" },
130         { Opt_deprecated, "intr" },
131         { Opt_deprecated, "nointr" },
132         { Opt_posix, "posix" },
133         { Opt_noposix, "noposix" },
134         { Opt_cto, "cto" },
135         { Opt_nocto, "nocto" },
136         { Opt_ac, "ac" },
137         { Opt_noac, "noac" },
138         { Opt_lock, "lock" },
139         { Opt_nolock, "nolock" },
140         { Opt_udp, "udp" },
141         { Opt_tcp, "tcp" },
142         { Opt_rdma, "rdma" },
143         { Opt_acl, "acl" },
144         { Opt_noacl, "noacl" },
145         { Opt_rdirplus, "rdirplus" },
146         { Opt_nordirplus, "nordirplus" },
147         { Opt_sharecache, "sharecache" },
148         { Opt_nosharecache, "nosharecache" },
149         { Opt_resvport, "resvport" },
150         { Opt_noresvport, "noresvport" },
151         { Opt_fscache, "fsc" },
152         { Opt_nofscache, "nofsc" },
153         { Opt_migration, "migration" },
154         { Opt_nomigration, "nomigration" },
155 
156         { Opt_port, "port=%s" },
157         { Opt_rsize, "rsize=%s" },
158         { Opt_wsize, "wsize=%s" },
159         { Opt_bsize, "bsize=%s" },
160         { Opt_timeo, "timeo=%s" },
161         { Opt_retrans, "retrans=%s" },
162         { Opt_acregmin, "acregmin=%s" },
163         { Opt_acregmax, "acregmax=%s" },
164         { Opt_acdirmin, "acdirmin=%s" },
165         { Opt_acdirmax, "acdirmax=%s" },
166         { Opt_actimeo, "actimeo=%s" },
167         { Opt_namelen, "namlen=%s" },
168         { Opt_mountport, "mountport=%s" },
169         { Opt_mountvers, "mountvers=%s" },
170         { Opt_minorversion, "minorversion=%s" },
171 
172         { Opt_nfsvers, "nfsvers=%s" },
173         { Opt_nfsvers, "vers=%s" },
174 
175         { Opt_sec, "sec=%s" },
176         { Opt_proto, "proto=%s" },
177         { Opt_mountproto, "mountproto=%s" },
178         { Opt_addr, "addr=%s" },
179         { Opt_clientaddr, "clientaddr=%s" },
180         { Opt_mounthost, "mounthost=%s" },
181         { Opt_mountaddr, "mountaddr=%s" },
182 
183         { Opt_lookupcache, "lookupcache=%s" },
184         { Opt_fscache_uniq, "fsc=%s" },
185         { Opt_local_lock, "local_lock=%s" },
186 
187         /* The following needs to be listed after all other options */
188         { Opt_nfsvers, "v%s" },
189 
190         { Opt_err, NULL }
191 };
192 
193 enum {
194         Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
195 
196         Opt_xprt_err
197 };
198 
199 static const match_table_t nfs_xprt_protocol_tokens = {
200         { Opt_xprt_udp, "udp" },
201         { Opt_xprt_udp6, "udp6" },
202         { Opt_xprt_tcp, "tcp" },
203         { Opt_xprt_tcp6, "tcp6" },
204         { Opt_xprt_rdma, "rdma" },
205 
206         { Opt_xprt_err, NULL }
207 };
208 
209 enum {
210         Opt_sec_none, Opt_sec_sys,
211         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
214 
215         Opt_sec_err
216 };
217 
218 static const match_table_t nfs_secflavor_tokens = {
219         { Opt_sec_none, "none" },
220         { Opt_sec_none, "null" },
221         { Opt_sec_sys, "sys" },
222 
223         { Opt_sec_krb5, "krb5" },
224         { Opt_sec_krb5i, "krb5i" },
225         { Opt_sec_krb5p, "krb5p" },
226 
227         { Opt_sec_lkey, "lkey" },
228         { Opt_sec_lkeyi, "lkeyi" },
229         { Opt_sec_lkeyp, "lkeyp" },
230 
231         { Opt_sec_spkm, "spkm3" },
232         { Opt_sec_spkmi, "spkm3i" },
233         { Opt_sec_spkmp, "spkm3p" },
234 
235         { Opt_sec_err, NULL }
236 };
237 
238 enum {
239         Opt_lookupcache_all, Opt_lookupcache_positive,
240         Opt_lookupcache_none,
241 
242         Opt_lookupcache_err
243 };
244 
245 static match_table_t nfs_lookupcache_tokens = {
246         { Opt_lookupcache_all, "all" },
247         { Opt_lookupcache_positive, "pos" },
248         { Opt_lookupcache_positive, "positive" },
249         { Opt_lookupcache_none, "none" },
250 
251         { Opt_lookupcache_err, NULL }
252 };
253 
254 enum {
255         Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
256         Opt_local_lock_none,
257 
258         Opt_local_lock_err
259 };
260 
261 static match_table_t nfs_local_lock_tokens = {
262         { Opt_local_lock_all, "all" },
263         { Opt_local_lock_flock, "flock" },
264         { Opt_local_lock_posix, "posix" },
265         { Opt_local_lock_none, "none" },
266 
267         { Opt_local_lock_err, NULL }
268 };
269 
270 enum {
271         Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272         Opt_vers_4_1, Opt_vers_4_2,
273 
274         Opt_vers_err
275 };
276 
277 static match_table_t nfs_vers_tokens = {
278         { Opt_vers_2, "2" },
279         { Opt_vers_3, "3" },
280         { Opt_vers_4, "4" },
281         { Opt_vers_4_0, "4.0" },
282         { Opt_vers_4_1, "4.1" },
283         { Opt_vers_4_2, "4.2" },
284 
285         { Opt_vers_err, NULL }
286 };
287 
288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289                 int flags, const char *dev_name, void *raw_data);
290 
291 struct file_system_type nfs_fs_type = {
292         .owner          = THIS_MODULE,
293         .name           = "nfs",
294         .mount          = nfs_fs_mount,
295         .kill_sb        = nfs_kill_super,
296         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
297 };
298 MODULE_ALIAS_FS("nfs");
299 EXPORT_SYMBOL_GPL(nfs_fs_type);
300 
301 struct file_system_type nfs_xdev_fs_type = {
302         .owner          = THIS_MODULE,
303         .name           = "nfs",
304         .mount          = nfs_xdev_mount,
305         .kill_sb        = nfs_kill_super,
306         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
307 };
308 
309 const struct super_operations nfs_sops = {
310         .alloc_inode    = nfs_alloc_inode,
311         .destroy_inode  = nfs_destroy_inode,
312         .write_inode    = nfs_write_inode,
313         .drop_inode     = nfs_drop_inode,
314         .put_super      = nfs_put_super,
315         .statfs         = nfs_statfs,
316         .evict_inode    = nfs_evict_inode,
317         .umount_begin   = nfs_umount_begin,
318         .show_options   = nfs_show_options,
319         .show_devname   = nfs_show_devname,
320         .show_path      = nfs_show_path,
321         .show_stats     = nfs_show_stats,
322         .remount_fs     = nfs_remount,
323 };
324 EXPORT_SYMBOL_GPL(nfs_sops);
325 
326 #if IS_ENABLED(CONFIG_NFS_V4)
327 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
328 static int nfs4_validate_mount_data(void *options,
329         struct nfs_parsed_mount_data *args, const char *dev_name);
330 
331 struct file_system_type nfs4_fs_type = {
332         .owner          = THIS_MODULE,
333         .name           = "nfs4",
334         .mount          = nfs_fs_mount,
335         .kill_sb        = nfs_kill_super,
336         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
337 };
338 MODULE_ALIAS_FS("nfs4");
339 MODULE_ALIAS("nfs4");
340 EXPORT_SYMBOL_GPL(nfs4_fs_type);
341 
342 static int __init register_nfs4_fs(void)
343 {
344         return register_filesystem(&nfs4_fs_type);
345 }
346 
347 static void unregister_nfs4_fs(void)
348 {
349         unregister_filesystem(&nfs4_fs_type);
350 }
351 #else
352 static int __init register_nfs4_fs(void)
353 {
354         return 0;
355 }
356 
357 static void unregister_nfs4_fs(void)
358 {
359 }
360 #endif
361 
362 static struct shrinker acl_shrinker = {
363         .count_objects  = nfs_access_cache_count,
364         .scan_objects   = nfs_access_cache_scan,
365         .seeks          = DEFAULT_SEEKS,
366 };
367 
368 /*
369  * Register the NFS filesystems
370  */
371 int __init register_nfs_fs(void)
372 {
373         int ret;
374 
375         ret = register_filesystem(&nfs_fs_type);
376         if (ret < 0)
377                 goto error_0;
378 
379         ret = register_nfs4_fs();
380         if (ret < 0)
381                 goto error_1;
382 
383         ret = nfs_register_sysctl();
384         if (ret < 0)
385                 goto error_2;
386         register_shrinker(&acl_shrinker);
387         return 0;
388 
389 error_2:
390         unregister_nfs4_fs();
391 error_1:
392         unregister_filesystem(&nfs_fs_type);
393 error_0:
394         return ret;
395 }
396 
397 /*
398  * Unregister the NFS filesystems
399  */
400 void __exit unregister_nfs_fs(void)
401 {
402         unregister_shrinker(&acl_shrinker);
403         nfs_unregister_sysctl();
404         unregister_nfs4_fs();
405         unregister_filesystem(&nfs_fs_type);
406 }
407 
408 bool nfs_sb_active(struct super_block *sb)
409 {
410         struct nfs_server *server = NFS_SB(sb);
411 
412         if (!atomic_inc_not_zero(&sb->s_active))
413                 return false;
414         if (atomic_inc_return(&server->active) != 1)
415                 atomic_dec(&sb->s_active);
416         return true;
417 }
418 EXPORT_SYMBOL_GPL(nfs_sb_active);
419 
420 void nfs_sb_deactive(struct super_block *sb)
421 {
422         struct nfs_server *server = NFS_SB(sb);
423 
424         if (atomic_dec_and_test(&server->active))
425                 deactivate_super(sb);
426 }
427 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
428 
429 /*
430  * Deliver file system statistics to userspace
431  */
432 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
433 {
434         struct nfs_server *server = NFS_SB(dentry->d_sb);
435         unsigned char blockbits;
436         unsigned long blockres;
437         struct nfs_fh *fh = NFS_FH(dentry->d_inode);
438         struct nfs_fsstat res;
439         int error = -ENOMEM;
440 
441         res.fattr = nfs_alloc_fattr();
442         if (res.fattr == NULL)
443                 goto out_err;
444 
445         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
446         if (unlikely(error == -ESTALE)) {
447                 struct dentry *pd_dentry;
448 
449                 pd_dentry = dget_parent(dentry);
450                 if (pd_dentry != NULL) {
451                         nfs_zap_caches(pd_dentry->d_inode);
452                         dput(pd_dentry);
453                 }
454         }
455         nfs_free_fattr(res.fattr);
456         if (error < 0)
457                 goto out_err;
458 
459         buf->f_type = NFS_SUPER_MAGIC;
460 
461         /*
462          * Current versions of glibc do not correctly handle the
463          * case where f_frsize != f_bsize.  Eventually we want to
464          * report the value of wtmult in this field.
465          */
466         buf->f_frsize = dentry->d_sb->s_blocksize;
467 
468         /*
469          * On most *nix systems, f_blocks, f_bfree, and f_bavail
470          * are reported in units of f_frsize.  Linux hasn't had
471          * an f_frsize field in its statfs struct until recently,
472          * thus historically Linux's sys_statfs reports these
473          * fields in units of f_bsize.
474          */
475         buf->f_bsize = dentry->d_sb->s_blocksize;
476         blockbits = dentry->d_sb->s_blocksize_bits;
477         blockres = (1 << blockbits) - 1;
478         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
479         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
480         buf->f_bavail = (res.abytes + blockres) >> blockbits;
481 
482         buf->f_files = res.tfiles;
483         buf->f_ffree = res.afiles;
484 
485         buf->f_namelen = server->namelen;
486 
487         return 0;
488 
489  out_err:
490         dprintk("%s: statfs error = %d\n", __func__, -error);
491         return error;
492 }
493 EXPORT_SYMBOL_GPL(nfs_statfs);
494 
495 /*
496  * Map the security flavour number to a name
497  */
498 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
499 {
500         static const struct {
501                 rpc_authflavor_t flavour;
502                 const char *str;
503         } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
504                 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
505                 { RPC_AUTH_NULL, "null" },
506                 { RPC_AUTH_UNIX, "sys" },
507                 { RPC_AUTH_GSS_KRB5, "krb5" },
508                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
509                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
510                 { RPC_AUTH_GSS_LKEY, "lkey" },
511                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
512                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
513                 { RPC_AUTH_GSS_SPKM, "spkm" },
514                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
515                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
516                 { UINT_MAX, "unknown" }
517         };
518         int i;
519 
520         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
521                 if (sec_flavours[i].flavour == flavour)
522                         break;
523         }
524         return sec_flavours[i].str;
525 }
526 
527 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
528                                   int showdefaults)
529 {
530         struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
531 
532         seq_printf(m, ",mountproto=");
533         switch (sap->sa_family) {
534         case AF_INET:
535                 switch (nfss->mountd_protocol) {
536                 case IPPROTO_UDP:
537                         seq_printf(m, RPCBIND_NETID_UDP);
538                         break;
539                 case IPPROTO_TCP:
540                         seq_printf(m, RPCBIND_NETID_TCP);
541                         break;
542                 default:
543                         if (showdefaults)
544                                 seq_printf(m, "auto");
545                 }
546                 break;
547         case AF_INET6:
548                 switch (nfss->mountd_protocol) {
549                 case IPPROTO_UDP:
550                         seq_printf(m, RPCBIND_NETID_UDP6);
551                         break;
552                 case IPPROTO_TCP:
553                         seq_printf(m, RPCBIND_NETID_TCP6);
554                         break;
555                 default:
556                         if (showdefaults)
557                                 seq_printf(m, "auto");
558                 }
559                 break;
560         default:
561                 if (showdefaults)
562                         seq_printf(m, "auto");
563         }
564 }
565 
566 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
567                                     int showdefaults)
568 {
569         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
570 
571         if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
572                 return;
573 
574         switch (sap->sa_family) {
575         case AF_INET: {
576                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
577                 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
578                 break;
579         }
580         case AF_INET6: {
581                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
582                 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
583                 break;
584         }
585         default:
586                 if (showdefaults)
587                         seq_printf(m, ",mountaddr=unspecified");
588         }
589 
590         if (nfss->mountd_version || showdefaults)
591                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
592         if ((nfss->mountd_port &&
593                 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
594                 showdefaults)
595                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
596 
597         nfs_show_mountd_netid(m, nfss, showdefaults);
598 }
599 
600 #if IS_ENABLED(CONFIG_NFS_V4)
601 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
602                                     int showdefaults)
603 {
604         struct nfs_client *clp = nfss->nfs_client;
605 
606         seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
607 }
608 #else
609 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
610                                     int showdefaults)
611 {
612 }
613 #endif
614 
615 static void nfs_show_nfs_version(struct seq_file *m,
616                 unsigned int version,
617                 unsigned int minorversion)
618 {
619         seq_printf(m, ",vers=%u", version);
620         if (version == 4)
621                 seq_printf(m, ".%u", minorversion);
622 }
623 
624 /*
625  * Describe the mount options in force on this server representation
626  */
627 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
628                                    int showdefaults)
629 {
630         static const struct proc_nfs_info {
631                 int flag;
632                 const char *str;
633                 const char *nostr;
634         } nfs_info[] = {
635                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
636                 { NFS_MOUNT_POSIX, ",posix", "" },
637                 { NFS_MOUNT_NOCTO, ",nocto", "" },
638                 { NFS_MOUNT_NOAC, ",noac", "" },
639                 { NFS_MOUNT_NONLM, ",nolock", "" },
640                 { NFS_MOUNT_NOACL, ",noacl", "" },
641                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
642                 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
643                 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
644                 { 0, NULL, NULL }
645         };
646         const struct proc_nfs_info *nfs_infop;
647         struct nfs_client *clp = nfss->nfs_client;
648         u32 version = clp->rpc_ops->version;
649         int local_flock, local_fcntl;
650 
651         nfs_show_nfs_version(m, version, clp->cl_minorversion);
652         seq_printf(m, ",rsize=%u", nfss->rsize);
653         seq_printf(m, ",wsize=%u", nfss->wsize);
654         if (nfss->bsize != 0)
655                 seq_printf(m, ",bsize=%u", nfss->bsize);
656         seq_printf(m, ",namlen=%u", nfss->namelen);
657         if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
658                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
659         if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
660                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
661         if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
662                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
663         if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
664                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
665         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
666                 if (nfss->flags & nfs_infop->flag)
667                         seq_puts(m, nfs_infop->str);
668                 else
669                         seq_puts(m, nfs_infop->nostr);
670         }
671         rcu_read_lock();
672         seq_printf(m, ",proto=%s",
673                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
674         rcu_read_unlock();
675         if (version == 4) {
676                 if (nfss->port != NFS_PORT)
677                         seq_printf(m, ",port=%u", nfss->port);
678         } else
679                 if (nfss->port)
680                         seq_printf(m, ",port=%u", nfss->port);
681 
682         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
683         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
684         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
685 
686         if (version != 4)
687                 nfs_show_mountd_options(m, nfss, showdefaults);
688         else
689                 nfs_show_nfsv4_options(m, nfss, showdefaults);
690 
691         if (nfss->options & NFS_OPTION_FSCACHE)
692                 seq_printf(m, ",fsc");
693 
694         if (nfss->options & NFS_OPTION_MIGRATION)
695                 seq_printf(m, ",migration");
696 
697         if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
698                 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
699                         seq_printf(m, ",lookupcache=none");
700                 else
701                         seq_printf(m, ",lookupcache=pos");
702         }
703 
704         local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
705         local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
706 
707         if (!local_flock && !local_fcntl)
708                 seq_printf(m, ",local_lock=none");
709         else if (local_flock && local_fcntl)
710                 seq_printf(m, ",local_lock=all");
711         else if (local_flock)
712                 seq_printf(m, ",local_lock=flock");
713         else
714                 seq_printf(m, ",local_lock=posix");
715 }
716 
717 /*
718  * Describe the mount options on this VFS mountpoint
719  */
720 int nfs_show_options(struct seq_file *m, struct dentry *root)
721 {
722         struct nfs_server *nfss = NFS_SB(root->d_sb);
723 
724         nfs_show_mount_options(m, nfss, 0);
725 
726         rcu_read_lock();
727         seq_printf(m, ",addr=%s",
728                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
729                                                         RPC_DISPLAY_ADDR));
730         rcu_read_unlock();
731 
732         return 0;
733 }
734 EXPORT_SYMBOL_GPL(nfs_show_options);
735 
736 #if IS_ENABLED(CONFIG_NFS_V4)
737 #ifdef CONFIG_NFS_V4_1
738 static void show_sessions(struct seq_file *m, struct nfs_server *server)
739 {
740         if (nfs4_has_session(server->nfs_client))
741                 seq_printf(m, ",sessions");
742 }
743 #else
744 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
745 #endif
746 #endif
747 
748 #ifdef CONFIG_NFS_V4_1
749 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
750 {
751         seq_printf(m, ",pnfs=");
752         if (server->pnfs_curr_ld)
753                 seq_printf(m, "%s", server->pnfs_curr_ld->name);
754         else
755                 seq_printf(m, "not configured");
756 }
757 
758 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
759 {
760         if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
761                 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
762                 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
763                            "date='%llu,%u'",
764                            impl_id->name, impl_id->domain,
765                            impl_id->date.seconds, impl_id->date.nseconds);
766         }
767 }
768 #else
769 #if IS_ENABLED(CONFIG_NFS_V4)
770 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
771 {
772 }
773 #endif
774 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
775 {
776 }
777 #endif
778 
779 int nfs_show_devname(struct seq_file *m, struct dentry *root)
780 {
781         char *page = (char *) __get_free_page(GFP_KERNEL);
782         char *devname, *dummy;
783         int err = 0;
784         if (!page)
785                 return -ENOMEM;
786         devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
787         if (IS_ERR(devname))
788                 err = PTR_ERR(devname);
789         else
790                 seq_escape(m, devname, " \t\n\\");
791         free_page((unsigned long)page);
792         return err;
793 }
794 EXPORT_SYMBOL_GPL(nfs_show_devname);
795 
796 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
797 {
798         seq_puts(m, "/");
799         return 0;
800 }
801 EXPORT_SYMBOL_GPL(nfs_show_path);
802 
803 /*
804  * Present statistical information for this VFS mountpoint
805  */
806 int nfs_show_stats(struct seq_file *m, struct dentry *root)
807 {
808         int i, cpu;
809         struct nfs_server *nfss = NFS_SB(root->d_sb);
810         struct rpc_auth *auth = nfss->client->cl_auth;
811         struct nfs_iostats totals = { };
812 
813         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
814 
815         /*
816          * Display all mount option settings
817          */
818         seq_printf(m, "\n\topts:\t");
819         seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
820         seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
821         seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
822         seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
823         nfs_show_mount_options(m, nfss, 1);
824 
825         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
826 
827         show_implementation_id(m, nfss);
828 
829         seq_printf(m, "\n\tcaps:\t");
830         seq_printf(m, "caps=0x%x", nfss->caps);
831         seq_printf(m, ",wtmult=%u", nfss->wtmult);
832         seq_printf(m, ",dtsize=%u", nfss->dtsize);
833         seq_printf(m, ",bsize=%u", nfss->bsize);
834         seq_printf(m, ",namlen=%u", nfss->namelen);
835 
836 #if IS_ENABLED(CONFIG_NFS_V4)
837         if (nfss->nfs_client->rpc_ops->version == 4) {
838                 seq_printf(m, "\n\tnfsv4:\t");
839                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
840                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
841                 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
842                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
843                 show_sessions(m, nfss);
844                 show_pnfs(m, nfss);
845         }
846 #endif
847 
848         /*
849          * Display security flavor in effect for this mount
850          */
851         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
852         if (auth->au_flavor)
853                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
854 
855         /*
856          * Display superblock I/O counters
857          */
858         for_each_possible_cpu(cpu) {
859                 struct nfs_iostats *stats;
860 
861                 preempt_disable();
862                 stats = per_cpu_ptr(nfss->io_stats, cpu);
863 
864                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
865                         totals.events[i] += stats->events[i];
866                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
867                         totals.bytes[i] += stats->bytes[i];
868 #ifdef CONFIG_NFS_FSCACHE
869                 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
870                         totals.fscache[i] += stats->fscache[i];
871 #endif
872 
873                 preempt_enable();
874         }
875 
876         seq_printf(m, "\n\tevents:\t");
877         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
878                 seq_printf(m, "%lu ", totals.events[i]);
879         seq_printf(m, "\n\tbytes:\t");
880         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
881                 seq_printf(m, "%Lu ", totals.bytes[i]);
882 #ifdef CONFIG_NFS_FSCACHE
883         if (nfss->options & NFS_OPTION_FSCACHE) {
884                 seq_printf(m, "\n\tfsc:\t");
885                 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
886                         seq_printf(m, "%Lu ", totals.bytes[i]);
887         }
888 #endif
889         seq_printf(m, "\n");
890 
891         rpc_print_iostats(m, nfss->client);
892 
893         return 0;
894 }
895 EXPORT_SYMBOL_GPL(nfs_show_stats);
896 
897 /*
898  * Begin unmount by attempting to remove all automounted mountpoints we added
899  * in response to xdev traversals and referrals
900  */
901 void nfs_umount_begin(struct super_block *sb)
902 {
903         struct nfs_server *server;
904         struct rpc_clnt *rpc;
905 
906         server = NFS_SB(sb);
907         /* -EIO all pending I/O */
908         rpc = server->client_acl;
909         if (!IS_ERR(rpc))
910                 rpc_killall_tasks(rpc);
911         rpc = server->client;
912         if (!IS_ERR(rpc))
913                 rpc_killall_tasks(rpc);
914 }
915 EXPORT_SYMBOL_GPL(nfs_umount_begin);
916 
917 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
918 {
919         struct nfs_parsed_mount_data *data;
920 
921         data = kzalloc(sizeof(*data), GFP_KERNEL);
922         if (data) {
923                 data->acregmin          = NFS_DEF_ACREGMIN;
924                 data->acregmax          = NFS_DEF_ACREGMAX;
925                 data->acdirmin          = NFS_DEF_ACDIRMIN;
926                 data->acdirmax          = NFS_DEF_ACDIRMAX;
927                 data->mount_server.port = NFS_UNSPEC_PORT;
928                 data->nfs_server.port   = NFS_UNSPEC_PORT;
929                 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
930                 data->selected_flavor   = RPC_AUTH_MAXFLAVOR;
931                 data->minorversion      = 0;
932                 data->need_mount        = true;
933                 data->net               = current->nsproxy->net_ns;
934                 security_init_mnt_opts(&data->lsm_opts);
935         }
936         return data;
937 }
938 
939 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
940 {
941         if (data) {
942                 kfree(data->client_address);
943                 kfree(data->mount_server.hostname);
944                 kfree(data->nfs_server.export_path);
945                 kfree(data->nfs_server.hostname);
946                 kfree(data->fscache_uniq);
947                 security_free_mnt_opts(&data->lsm_opts);
948                 kfree(data);
949         }
950 }
951 
952 /*
953  * Sanity-check a server address provided by the mount command.
954  *
955  * Address family must be initialized, and address must not be
956  * the ANY address for that family.
957  */
958 static int nfs_verify_server_address(struct sockaddr *addr)
959 {
960         switch (addr->sa_family) {
961         case AF_INET: {
962                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
963                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
964         }
965         case AF_INET6: {
966                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
967                 return !ipv6_addr_any(sa);
968         }
969         }
970 
971         dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
972         return 0;
973 }
974 
975 /*
976  * Select between a default port value and a user-specified port value.
977  * If a zero value is set, then autobind will be used.
978  */
979 static void nfs_set_port(struct sockaddr *sap, int *port,
980                                  const unsigned short default_port)
981 {
982         if (*port == NFS_UNSPEC_PORT)
983                 *port = default_port;
984 
985         rpc_set_port(sap, *port);
986 }
987 
988 /*
989  * Sanity check the NFS transport protocol.
990  *
991  */
992 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
993 {
994         switch (mnt->nfs_server.protocol) {
995         case XPRT_TRANSPORT_UDP:
996         case XPRT_TRANSPORT_TCP:
997         case XPRT_TRANSPORT_RDMA:
998                 break;
999         default:
1000                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1001         }
1002 }
1003 
1004 /*
1005  * For text based NFSv2/v3 mounts, the mount protocol transport default
1006  * settings should depend upon the specified NFS transport.
1007  */
1008 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1009 {
1010         nfs_validate_transport_protocol(mnt);
1011 
1012         if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1013             mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1014                         return;
1015         switch (mnt->nfs_server.protocol) {
1016         case XPRT_TRANSPORT_UDP:
1017                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1018                 break;
1019         case XPRT_TRANSPORT_TCP:
1020         case XPRT_TRANSPORT_RDMA:
1021                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1022         }
1023 }
1024 
1025 /*
1026  * Add 'flavor' to 'auth_info' if not already present.
1027  * Returns true if 'flavor' ends up in the list, false otherwise
1028  */
1029 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1030                               rpc_authflavor_t flavor)
1031 {
1032         unsigned int i;
1033         unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1034 
1035         /* make sure this flavor isn't already in the list */
1036         for (i = 0; i < auth_info->flavor_len; i++) {
1037                 if (flavor == auth_info->flavors[i])
1038                         return true;
1039         }
1040 
1041         if (auth_info->flavor_len + 1 >= max_flavor_len) {
1042                 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1043                 return false;
1044         }
1045 
1046         auth_info->flavors[auth_info->flavor_len++] = flavor;
1047         return true;
1048 }
1049 
1050 /*
1051  * Return true if 'match' is in auth_info or auth_info is empty.
1052  * Return false otherwise.
1053  */
1054 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1055                          rpc_authflavor_t match)
1056 {
1057         int i;
1058 
1059         if (!auth_info->flavor_len)
1060                 return true;
1061 
1062         for (i = 0; i < auth_info->flavor_len; i++) {
1063                 if (auth_info->flavors[i] == match)
1064                         return true;
1065         }
1066         return false;
1067 }
1068 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1069 
1070 /*
1071  * Parse the value of the 'sec=' option.
1072  */
1073 static int nfs_parse_security_flavors(char *value,
1074                                       struct nfs_parsed_mount_data *mnt)
1075 {
1076         substring_t args[MAX_OPT_ARGS];
1077         rpc_authflavor_t pseudoflavor;
1078         char *p;
1079 
1080         dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1081 
1082         while ((p = strsep(&value, ":")) != NULL) {
1083                 switch (match_token(p, nfs_secflavor_tokens, args)) {
1084                 case Opt_sec_none:
1085                         pseudoflavor = RPC_AUTH_NULL;
1086                         break;
1087                 case Opt_sec_sys:
1088                         pseudoflavor = RPC_AUTH_UNIX;
1089                         break;
1090                 case Opt_sec_krb5:
1091                         pseudoflavor = RPC_AUTH_GSS_KRB5;
1092                         break;
1093                 case Opt_sec_krb5i:
1094                         pseudoflavor = RPC_AUTH_GSS_KRB5I;
1095                         break;
1096                 case Opt_sec_krb5p:
1097                         pseudoflavor = RPC_AUTH_GSS_KRB5P;
1098                         break;
1099                 case Opt_sec_lkey:
1100                         pseudoflavor = RPC_AUTH_GSS_LKEY;
1101                         break;
1102                 case Opt_sec_lkeyi:
1103                         pseudoflavor = RPC_AUTH_GSS_LKEYI;
1104                         break;
1105                 case Opt_sec_lkeyp:
1106                         pseudoflavor = RPC_AUTH_GSS_LKEYP;
1107                         break;
1108                 case Opt_sec_spkm:
1109                         pseudoflavor = RPC_AUTH_GSS_SPKM;
1110                         break;
1111                 case Opt_sec_spkmi:
1112                         pseudoflavor = RPC_AUTH_GSS_SPKMI;
1113                         break;
1114                 case Opt_sec_spkmp:
1115                         pseudoflavor = RPC_AUTH_GSS_SPKMP;
1116                         break;
1117                 default:
1118                         dfprintk(MOUNT,
1119                                  "NFS: sec= option '%s' not recognized\n", p);
1120                         return 0;
1121                 }
1122 
1123                 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1124                         return 0;
1125         }
1126 
1127         return 1;
1128 }
1129 
1130 static int nfs_parse_version_string(char *string,
1131                 struct nfs_parsed_mount_data *mnt,
1132                 substring_t *args)
1133 {
1134         mnt->flags &= ~NFS_MOUNT_VER3;
1135         switch (match_token(string, nfs_vers_tokens, args)) {
1136         case Opt_vers_2:
1137                 mnt->version = 2;
1138                 break;
1139         case Opt_vers_3:
1140                 mnt->flags |= NFS_MOUNT_VER3;
1141                 mnt->version = 3;
1142                 break;
1143         case Opt_vers_4:
1144                 /* Backward compatibility option. In future,
1145                  * the mount program should always supply
1146                  * a NFSv4 minor version number.
1147                  */
1148                 mnt->version = 4;
1149                 break;
1150         case Opt_vers_4_0:
1151                 mnt->version = 4;
1152                 mnt->minorversion = 0;
1153                 break;
1154         case Opt_vers_4_1:
1155                 mnt->version = 4;
1156                 mnt->minorversion = 1;
1157                 break;
1158         case Opt_vers_4_2:
1159                 mnt->version = 4;
1160                 mnt->minorversion = 2;
1161                 break;
1162         default:
1163                 return 0;
1164         }
1165         return 1;
1166 }
1167 
1168 static int nfs_get_option_str(substring_t args[], char **option)
1169 {
1170         kfree(*option);
1171         *option = match_strdup(args);
1172         return !*option;
1173 }
1174 
1175 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1176 {
1177         int rc;
1178         char *string;
1179 
1180         string = match_strdup(args);
1181         if (string == NULL)
1182                 return -ENOMEM;
1183         rc = kstrtoul(string, 10, option);
1184         kfree(string);
1185 
1186         return rc;
1187 }
1188 
1189 /*
1190  * Error-check and convert a string of mount options from user space into
1191  * a data structure.  The whole mount string is processed; bad options are
1192  * skipped as they are encountered.  If there were no errors, return 1;
1193  * otherwise return 0 (zero).
1194  */
1195 static int nfs_parse_mount_options(char *raw,
1196                                    struct nfs_parsed_mount_data *mnt)
1197 {
1198         char *p, *string, *secdata;
1199         int rc, sloppy = 0, invalid_option = 0;
1200         unsigned short protofamily = AF_UNSPEC;
1201         unsigned short mountfamily = AF_UNSPEC;
1202 
1203         if (!raw) {
1204                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1205                 return 1;
1206         }
1207         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1208 
1209         secdata = alloc_secdata();
1210         if (!secdata)
1211                 goto out_nomem;
1212 
1213         rc = security_sb_copy_data(raw, secdata);
1214         if (rc)
1215                 goto out_security_failure;
1216 
1217         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1218         if (rc)
1219                 goto out_security_failure;
1220 
1221         free_secdata(secdata);
1222 
1223         while ((p = strsep(&raw, ",")) != NULL) {
1224                 substring_t args[MAX_OPT_ARGS];
1225                 unsigned long option;
1226                 int token;
1227 
1228                 if (!*p)
1229                         continue;
1230 
1231                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
1232 
1233                 token = match_token(p, nfs_mount_option_tokens, args);
1234                 switch (token) {
1235 
1236                 /*
1237                  * boolean options:  foo/nofoo
1238                  */
1239                 case Opt_soft:
1240                         mnt->flags |= NFS_MOUNT_SOFT;
1241                         break;
1242                 case Opt_hard:
1243                         mnt->flags &= ~NFS_MOUNT_SOFT;
1244                         break;
1245                 case Opt_posix:
1246                         mnt->flags |= NFS_MOUNT_POSIX;
1247                         break;
1248                 case Opt_noposix:
1249                         mnt->flags &= ~NFS_MOUNT_POSIX;
1250                         break;
1251                 case Opt_cto:
1252                         mnt->flags &= ~NFS_MOUNT_NOCTO;
1253                         break;
1254                 case Opt_nocto:
1255                         mnt->flags |= NFS_MOUNT_NOCTO;
1256                         break;
1257                 case Opt_ac:
1258                         mnt->flags &= ~NFS_MOUNT_NOAC;
1259                         break;
1260                 case Opt_noac:
1261                         mnt->flags |= NFS_MOUNT_NOAC;
1262                         break;
1263                 case Opt_lock:
1264                         mnt->flags &= ~NFS_MOUNT_NONLM;
1265                         mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1266                                         NFS_MOUNT_LOCAL_FCNTL);
1267                         break;
1268                 case Opt_nolock:
1269                         mnt->flags |= NFS_MOUNT_NONLM;
1270                         mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1271                                        NFS_MOUNT_LOCAL_FCNTL);
1272                         break;
1273                 case Opt_udp:
1274                         mnt->flags &= ~NFS_MOUNT_TCP;
1275                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1276                         break;
1277                 case Opt_tcp:
1278                         mnt->flags |= NFS_MOUNT_TCP;
1279                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1280                         break;
1281                 case Opt_rdma:
1282                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1283                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1284                         xprt_load_transport(p);
1285                         break;
1286                 case Opt_acl:
1287                         mnt->flags &= ~NFS_MOUNT_NOACL;
1288                         break;
1289                 case Opt_noacl:
1290                         mnt->flags |= NFS_MOUNT_NOACL;
1291                         break;
1292                 case Opt_rdirplus:
1293                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1294                         break;
1295                 case Opt_nordirplus:
1296                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1297                         break;
1298                 case Opt_sharecache:
1299                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
1300                         break;
1301                 case Opt_nosharecache:
1302                         mnt->flags |= NFS_MOUNT_UNSHARED;
1303                         break;
1304                 case Opt_resvport:
1305                         mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1306                         break;
1307                 case Opt_noresvport:
1308                         mnt->flags |= NFS_MOUNT_NORESVPORT;
1309                         break;
1310                 case Opt_fscache:
1311                         mnt->options |= NFS_OPTION_FSCACHE;
1312                         kfree(mnt->fscache_uniq);
1313                         mnt->fscache_uniq = NULL;
1314                         break;
1315                 case Opt_nofscache:
1316                         mnt->options &= ~NFS_OPTION_FSCACHE;
1317                         kfree(mnt->fscache_uniq);
1318                         mnt->fscache_uniq = NULL;
1319                         break;
1320                 case Opt_migration:
1321                         mnt->options |= NFS_OPTION_MIGRATION;
1322                         break;
1323                 case Opt_nomigration:
1324                         mnt->options &= ~NFS_OPTION_MIGRATION;
1325                         break;
1326 
1327                 /*
1328                  * options that take numeric values
1329                  */
1330                 case Opt_port:
1331                         if (nfs_get_option_ul(args, &option) ||
1332                             option > USHRT_MAX)
1333                                 goto out_invalid_value;
1334                         mnt->nfs_server.port = option;
1335                         break;
1336                 case Opt_rsize:
1337                         if (nfs_get_option_ul(args, &option))
1338                                 goto out_invalid_value;
1339                         mnt->rsize = option;
1340                         break;
1341                 case Opt_wsize:
1342                         if (nfs_get_option_ul(args, &option))
1343                                 goto out_invalid_value;
1344                         mnt->wsize = option;
1345                         break;
1346                 case Opt_bsize:
1347                         if (nfs_get_option_ul(args, &option))
1348                                 goto out_invalid_value;
1349                         mnt->bsize = option;
1350                         break;
1351                 case Opt_timeo:
1352                         if (nfs_get_option_ul(args, &option) || option == 0)
1353                                 goto out_invalid_value;
1354                         mnt->timeo = option;
1355                         break;
1356                 case Opt_retrans:
1357                         if (nfs_get_option_ul(args, &option) || option == 0)
1358                                 goto out_invalid_value;
1359                         mnt->retrans = option;
1360                         break;
1361                 case Opt_acregmin:
1362                         if (nfs_get_option_ul(args, &option))
1363                                 goto out_invalid_value;
1364                         mnt->acregmin = option;
1365                         break;
1366                 case Opt_acregmax:
1367                         if (nfs_get_option_ul(args, &option))
1368                                 goto out_invalid_value;
1369                         mnt->acregmax = option;
1370                         break;
1371                 case Opt_acdirmin:
1372                         if (nfs_get_option_ul(args, &option))
1373                                 goto out_invalid_value;
1374                         mnt->acdirmin = option;
1375                         break;
1376                 case Opt_acdirmax:
1377                         if (nfs_get_option_ul(args, &option))
1378                                 goto out_invalid_value;
1379                         mnt->acdirmax = option;
1380                         break;
1381                 case Opt_actimeo:
1382                         if (nfs_get_option_ul(args, &option))
1383                                 goto out_invalid_value;
1384                         mnt->acregmin = mnt->acregmax =
1385                         mnt->acdirmin = mnt->acdirmax = option;
1386                         break;
1387                 case Opt_namelen:
1388                         if (nfs_get_option_ul(args, &option))
1389                                 goto out_invalid_value;
1390                         mnt->namlen = option;
1391                         break;
1392                 case Opt_mountport:
1393                         if (nfs_get_option_ul(args, &option) ||
1394                             option > USHRT_MAX)
1395                                 goto out_invalid_value;
1396                         mnt->mount_server.port = option;
1397                         break;
1398                 case Opt_mountvers:
1399                         if (nfs_get_option_ul(args, &option) ||
1400                             option < NFS_MNT_VERSION ||
1401                             option > NFS_MNT3_VERSION)
1402                                 goto out_invalid_value;
1403                         mnt->mount_server.version = option;
1404                         break;
1405                 case Opt_minorversion:
1406                         if (nfs_get_option_ul(args, &option))
1407                                 goto out_invalid_value;
1408                         if (option > NFS4_MAX_MINOR_VERSION)
1409                                 goto out_invalid_value;
1410                         mnt->minorversion = option;
1411                         break;
1412 
1413                 /*
1414                  * options that take text values
1415                  */
1416                 case Opt_nfsvers:
1417                         string = match_strdup(args);
1418                         if (string == NULL)
1419                                 goto out_nomem;
1420                         rc = nfs_parse_version_string(string, mnt, args);
1421                         kfree(string);
1422                         if (!rc)
1423                                 goto out_invalid_value;
1424                         break;
1425                 case Opt_sec:
1426                         string = match_strdup(args);
1427                         if (string == NULL)
1428                                 goto out_nomem;
1429                         rc = nfs_parse_security_flavors(string, mnt);
1430                         kfree(string);
1431                         if (!rc) {
1432                                 dfprintk(MOUNT, "NFS:   unrecognized "
1433                                                 "security flavor\n");
1434                                 return 0;
1435                         }
1436                         break;
1437                 case Opt_proto:
1438                         string = match_strdup(args);
1439                         if (string == NULL)
1440                                 goto out_nomem;
1441                         token = match_token(string,
1442                                             nfs_xprt_protocol_tokens, args);
1443 
1444                         protofamily = AF_INET;
1445                         switch (token) {
1446                         case Opt_xprt_udp6:
1447                                 protofamily = AF_INET6;
1448                         case Opt_xprt_udp:
1449                                 mnt->flags &= ~NFS_MOUNT_TCP;
1450                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1451                                 break;
1452                         case Opt_xprt_tcp6:
1453                                 protofamily = AF_INET6;
1454                         case Opt_xprt_tcp:
1455                                 mnt->flags |= NFS_MOUNT_TCP;
1456                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1457                                 break;
1458                         case Opt_xprt_rdma:
1459                                 /* vector side protocols to TCP */
1460                                 mnt->flags |= NFS_MOUNT_TCP;
1461                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1462                                 xprt_load_transport(string);
1463                                 break;
1464                         default:
1465                                 dfprintk(MOUNT, "NFS:   unrecognized "
1466                                                 "transport protocol\n");
1467                                 kfree(string);
1468                                 return 0;
1469                         }
1470                         kfree(string);
1471                         break;
1472                 case Opt_mountproto:
1473                         string = match_strdup(args);
1474                         if (string == NULL)
1475                                 goto out_nomem;
1476                         token = match_token(string,
1477                                             nfs_xprt_protocol_tokens, args);
1478                         kfree(string);
1479 
1480                         mountfamily = AF_INET;
1481                         switch (token) {
1482                         case Opt_xprt_udp6:
1483                                 mountfamily = AF_INET6;
1484                         case Opt_xprt_udp:
1485                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1486                                 break;
1487                         case Opt_xprt_tcp6:
1488                                 mountfamily = AF_INET6;
1489                         case Opt_xprt_tcp:
1490                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1491                                 break;
1492                         case Opt_xprt_rdma: /* not used for side protocols */
1493                         default:
1494                                 dfprintk(MOUNT, "NFS:   unrecognized "
1495                                                 "transport protocol\n");
1496                                 return 0;
1497                         }
1498                         break;
1499                 case Opt_addr:
1500                         string = match_strdup(args);
1501                         if (string == NULL)
1502                                 goto out_nomem;
1503                         mnt->nfs_server.addrlen =
1504                                 rpc_pton(mnt->net, string, strlen(string),
1505                                         (struct sockaddr *)
1506                                         &mnt->nfs_server.address,
1507                                         sizeof(mnt->nfs_server.address));
1508                         kfree(string);
1509                         if (mnt->nfs_server.addrlen == 0)
1510                                 goto out_invalid_address;
1511                         break;
1512                 case Opt_clientaddr:
1513                         if (nfs_get_option_str(args, &mnt->client_address))
1514                                 goto out_nomem;
1515                         break;
1516                 case Opt_mounthost:
1517                         if (nfs_get_option_str(args,
1518                                                &mnt->mount_server.hostname))
1519                                 goto out_nomem;
1520                         break;
1521                 case Opt_mountaddr:
1522                         string = match_strdup(args);
1523                         if (string == NULL)
1524                                 goto out_nomem;
1525                         mnt->mount_server.addrlen =
1526                                 rpc_pton(mnt->net, string, strlen(string),
1527                                         (struct sockaddr *)
1528                                         &mnt->mount_server.address,
1529                                         sizeof(mnt->mount_server.address));
1530                         kfree(string);
1531                         if (mnt->mount_server.addrlen == 0)
1532                                 goto out_invalid_address;
1533                         break;
1534                 case Opt_lookupcache:
1535                         string = match_strdup(args);
1536                         if (string == NULL)
1537                                 goto out_nomem;
1538                         token = match_token(string,
1539                                         nfs_lookupcache_tokens, args);
1540                         kfree(string);
1541                         switch (token) {
1542                                 case Opt_lookupcache_all:
1543                                         mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1544                                         break;
1545                                 case Opt_lookupcache_positive:
1546                                         mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1547                                         mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1548                                         break;
1549                                 case Opt_lookupcache_none:
1550                                         mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1551                                         break;
1552                                 default:
1553                                         dfprintk(MOUNT, "NFS:   invalid "
1554                                                         "lookupcache argument\n");
1555                                         return 0;
1556                         };
1557                         break;
1558                 case Opt_fscache_uniq:
1559                         if (nfs_get_option_str(args, &mnt->fscache_uniq))
1560                                 goto out_nomem;
1561                         mnt->options |= NFS_OPTION_FSCACHE;
1562                         break;
1563                 case Opt_local_lock:
1564                         string = match_strdup(args);
1565                         if (string == NULL)
1566                                 goto out_nomem;
1567                         token = match_token(string, nfs_local_lock_tokens,
1568                                         args);
1569                         kfree(string);
1570                         switch (token) {
1571                         case Opt_local_lock_all:
1572                                 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1573                                                NFS_MOUNT_LOCAL_FCNTL);
1574                                 break;
1575                         case Opt_local_lock_flock:
1576                                 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1577                                 break;
1578                         case Opt_local_lock_posix:
1579                                 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1580                                 break;
1581                         case Opt_local_lock_none:
1582                                 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1583                                                 NFS_MOUNT_LOCAL_FCNTL);
1584                                 break;
1585                         default:
1586                                 dfprintk(MOUNT, "NFS:   invalid "
1587                                                 "local_lock argument\n");
1588                                 return 0;
1589                         };
1590                         break;
1591 
1592                 /*
1593                  * Special options
1594                  */
1595                 case Opt_sloppy:
1596                         sloppy = 1;
1597                         dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
1598                         break;
1599                 case Opt_userspace:
1600                 case Opt_deprecated:
1601                         dfprintk(MOUNT, "NFS:   ignoring mount option "
1602                                         "'%s'\n", p);
1603                         break;
1604 
1605                 default:
1606                         invalid_option = 1;
1607                         dfprintk(MOUNT, "NFS:   unrecognized mount option "
1608                                         "'%s'\n", p);
1609                 }
1610         }
1611 
1612         if (!sloppy && invalid_option)
1613                 return 0;
1614 
1615         if (mnt->minorversion && mnt->version != 4)
1616                 goto out_minorversion_mismatch;
1617 
1618         if (mnt->options & NFS_OPTION_MIGRATION &&
1619             (mnt->version != 4 || mnt->minorversion != 0))
1620                 goto out_migration_misuse;
1621 
1622         /*
1623          * verify that any proto=/mountproto= options match the address
1624          * families in the addr=/mountaddr= options.
1625          */
1626         if (protofamily != AF_UNSPEC &&
1627             protofamily != mnt->nfs_server.address.ss_family)
1628                 goto out_proto_mismatch;
1629 
1630         if (mountfamily != AF_UNSPEC) {
1631                 if (mnt->mount_server.addrlen) {
1632                         if (mountfamily != mnt->mount_server.address.ss_family)
1633                                 goto out_mountproto_mismatch;
1634                 } else {
1635                         if (mountfamily != mnt->nfs_server.address.ss_family)
1636                                 goto out_mountproto_mismatch;
1637                 }
1638         }
1639 
1640         return 1;
1641 
1642 out_mountproto_mismatch:
1643         printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1644                          "option\n");
1645         return 0;
1646 out_proto_mismatch:
1647         printk(KERN_INFO "NFS: server address does not match proto= option\n");
1648         return 0;
1649 out_invalid_address:
1650         printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1651         return 0;
1652 out_invalid_value:
1653         printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1654         return 0;
1655 out_minorversion_mismatch:
1656         printk(KERN_INFO "NFS: mount option vers=%u does not support "
1657                          "minorversion=%u\n", mnt->version, mnt->minorversion);
1658         return 0;
1659 out_migration_misuse:
1660         printk(KERN_INFO
1661                 "NFS: 'migration' not supported for this NFS version\n");
1662         return 0;
1663 out_nomem:
1664         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1665         return 0;
1666 out_security_failure:
1667         free_secdata(secdata);
1668         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1669         return 0;
1670 }
1671 
1672 /*
1673  * Ensure that a specified authtype in args->auth_info is supported by
1674  * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1675  * -EACCES if not.
1676  */
1677 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1678                         rpc_authflavor_t *server_authlist, unsigned int count)
1679 {
1680         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1681         unsigned int i;
1682 
1683         /*
1684          * If the sec= mount option is used, the specified flavor or AUTH_NULL
1685          * must be in the list returned by the server.
1686          *
1687          * AUTH_NULL has a special meaning when it's in the server list - it
1688          * means that the server will ignore the rpc creds, so any flavor
1689          * can be used.
1690          */
1691         for (i = 0; i < count; i++) {
1692                 flavor = server_authlist[i];
1693 
1694                 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1695                     flavor == RPC_AUTH_NULL)
1696                         goto out;
1697         }
1698 
1699         dfprintk(MOUNT,
1700                  "NFS: specified auth flavors not supported by server\n");
1701         return -EACCES;
1702 
1703 out:
1704         args->selected_flavor = flavor;
1705         dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1706         return 0;
1707 }
1708 
1709 /*
1710  * Use the remote server's MOUNT service to request the NFS file handle
1711  * corresponding to the provided path.
1712  */
1713 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1714                              struct nfs_fh *root_fh,
1715                              rpc_authflavor_t *server_authlist,
1716                              unsigned int *server_authlist_len)
1717 {
1718         struct nfs_mount_request request = {
1719                 .sap            = (struct sockaddr *)
1720                                                 &args->mount_server.address,
1721                 .dirpath        = args->nfs_server.export_path,
1722                 .protocol       = args->mount_server.protocol,
1723                 .fh             = root_fh,
1724                 .noresvport     = args->flags & NFS_MOUNT_NORESVPORT,
1725                 .auth_flav_len  = server_authlist_len,
1726                 .auth_flavs     = server_authlist,
1727                 .net            = args->net,
1728         };
1729         int status;
1730 
1731         if (args->mount_server.version == 0) {
1732                 switch (args->version) {
1733                         default:
1734                                 args->mount_server.version = NFS_MNT3_VERSION;
1735                                 break;
1736                         case 2:
1737                                 args->mount_server.version = NFS_MNT_VERSION;
1738                 }
1739         }
1740         request.version = args->mount_server.version;
1741 
1742         if (args->mount_server.hostname)
1743                 request.hostname = args->mount_server.hostname;
1744         else
1745                 request.hostname = args->nfs_server.hostname;
1746 
1747         /*
1748          * Construct the mount server's address.
1749          */
1750         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1751                 memcpy(request.sap, &args->nfs_server.address,
1752                        args->nfs_server.addrlen);
1753                 args->mount_server.addrlen = args->nfs_server.addrlen;
1754         }
1755         request.salen = args->mount_server.addrlen;
1756         nfs_set_port(request.sap, &args->mount_server.port, 0);
1757 
1758         /*
1759          * Now ask the mount server to map our export path
1760          * to a file handle.
1761          */
1762         status = nfs_mount(&request);
1763         if (status != 0) {
1764                 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1765                                 request.hostname, status);
1766                 return status;
1767         }
1768 
1769         return 0;
1770 }
1771 
1772 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1773                                         struct nfs_subversion *nfs_mod)
1774 {
1775         int status;
1776         unsigned int i;
1777         bool tried_auth_unix = false;
1778         bool auth_null_in_list = false;
1779         struct nfs_server *server = ERR_PTR(-EACCES);
1780         struct nfs_parsed_mount_data *args = mount_info->parsed;
1781         rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1782         unsigned int authlist_len = ARRAY_SIZE(authlist);
1783 
1784         status = nfs_request_mount(args, mount_info->mntfh, authlist,
1785                                         &authlist_len);
1786         if (status)
1787                 return ERR_PTR(status);
1788 
1789         /*
1790          * Was a sec= authflavor specified in the options? First, verify
1791          * whether the server supports it, and then just try to use it if so.
1792          */
1793         if (args->auth_info.flavor_len > 0) {
1794                 status = nfs_verify_authflavors(args, authlist, authlist_len);
1795                 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1796                          args->selected_flavor);
1797                 if (status)
1798                         return ERR_PTR(status);
1799                 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1800         }
1801 
1802         /*
1803          * No sec= option was provided. RFC 2623, section 2.7 suggests we
1804          * SHOULD prefer the flavor listed first. However, some servers list
1805          * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1806          */
1807         for (i = 0; i < authlist_len; ++i) {
1808                 rpc_authflavor_t flavor;
1809                 struct rpcsec_gss_info info;
1810 
1811                 flavor = authlist[i];
1812                 switch (flavor) {
1813                 case RPC_AUTH_UNIX:
1814                         tried_auth_unix = true;
1815                         break;
1816                 case RPC_AUTH_NULL:
1817                         auth_null_in_list = true;
1818                         continue;
1819                 default:
1820                         if (rpcauth_get_gssinfo(flavor, &info) != 0)
1821                                 continue;
1822                         /* Fallthrough */
1823                 }
1824                 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1825                 args->selected_flavor = flavor;
1826                 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1827                 if (!IS_ERR(server))
1828                         return server;
1829         }
1830 
1831         /*
1832          * Nothing we tried so far worked. At this point, give up if we've
1833          * already tried AUTH_UNIX or if the server's list doesn't contain
1834          * AUTH_NULL
1835          */
1836         if (tried_auth_unix || !auth_null_in_list)
1837                 return server;
1838 
1839         /* Last chance! Try AUTH_UNIX */
1840         dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1841         args->selected_flavor = RPC_AUTH_UNIX;
1842         return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1843 }
1844 
1845 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1846                              struct nfs_mount_info *mount_info,
1847                              struct nfs_subversion *nfs_mod)
1848 {
1849         struct nfs_server *server;
1850 
1851         if (mount_info->parsed->need_mount)
1852                 server = nfs_try_mount_request(mount_info, nfs_mod);
1853         else
1854                 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1855 
1856         if (IS_ERR(server))
1857                 return ERR_CAST(server);
1858 
1859         return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1860 }
1861 EXPORT_SYMBOL_GPL(nfs_try_mount);
1862 
1863 /*
1864  * Split "dev_name" into "hostname:export_path".
1865  *
1866  * The leftmost colon demarks the split between the server's hostname
1867  * and the export path.  If the hostname starts with a left square
1868  * bracket, then it may contain colons.
1869  *
1870  * Note: caller frees hostname and export path, even on error.
1871  */
1872 static int nfs_parse_devname(const char *dev_name,
1873                              char **hostname, size_t maxnamlen,
1874                              char **export_path, size_t maxpathlen)
1875 {
1876         size_t len;
1877         char *end;
1878 
1879         if (unlikely(!dev_name || !*dev_name)) {
1880                 dfprintk(MOUNT, "NFS: device name not specified\n");
1881                 return -EINVAL;
1882         }
1883 
1884         /* Is the host name protected with square brakcets? */
1885         if (*dev_name == '[') {
1886                 end = strchr(++dev_name, ']');
1887                 if (end == NULL || end[1] != ':')
1888                         goto out_bad_devname;
1889 
1890                 len = end - dev_name;
1891                 end++;
1892         } else {
1893                 char *comma;
1894 
1895                 end = strchr(dev_name, ':');
1896                 if (end == NULL)
1897                         goto out_bad_devname;
1898                 len = end - dev_name;
1899 
1900                 /* kill possible hostname list: not supported */
1901                 comma = strchr(dev_name, ',');
1902                 if (comma != NULL && comma < end)
1903                         *comma = 0;
1904         }
1905 
1906         if (len > maxnamlen)
1907                 goto out_hostname;
1908 
1909         /* N.B. caller will free nfs_server.hostname in all cases */
1910         *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1911         if (*hostname == NULL)
1912                 goto out_nomem;
1913         len = strlen(++end);
1914         if (len > maxpathlen)
1915                 goto out_path;
1916         *export_path = kstrndup(end, len, GFP_KERNEL);
1917         if (!*export_path)
1918                 goto out_nomem;
1919 
1920         dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1921         return 0;
1922 
1923 out_bad_devname:
1924         dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1925         return -EINVAL;
1926 
1927 out_nomem:
1928         dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1929         return -ENOMEM;
1930 
1931 out_hostname:
1932         dfprintk(MOUNT, "NFS: server hostname too long\n");
1933         return -ENAMETOOLONG;
1934 
1935 out_path:
1936         dfprintk(MOUNT, "NFS: export pathname too long\n");
1937         return -ENAMETOOLONG;
1938 }
1939 
1940 /*
1941  * Validate the NFS2/NFS3 mount data
1942  * - fills in the mount root filehandle
1943  *
1944  * For option strings, user space handles the following behaviors:
1945  *
1946  * + DNS: mapping server host name to IP address ("addr=" option)
1947  *
1948  * + failure mode: how to behave if a mount request can't be handled
1949  *   immediately ("fg/bg" option)
1950  *
1951  * + retry: how often to retry a mount request ("retry=" option)
1952  *
1953  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1954  *   mountproto=tcp after mountproto=udp, and so on
1955  */
1956 static int nfs23_validate_mount_data(void *options,
1957                                      struct nfs_parsed_mount_data *args,
1958                                      struct nfs_fh *mntfh,
1959                                      const char *dev_name)
1960 {
1961         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1962         struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1963         int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1964 
1965         if (data == NULL)
1966                 goto out_no_data;
1967 
1968         args->version = NFS_DEFAULT_VERSION;
1969         switch (data->version) {
1970         case 1:
1971                 data->namlen = 0;
1972         case 2:
1973                 data->bsize = 0;
1974         case 3:
1975                 if (data->flags & NFS_MOUNT_VER3)
1976                         goto out_no_v3;
1977                 data->root.size = NFS2_FHSIZE;
1978                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1979                 /* Turn off security negotiation */
1980                 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1981         case 4:
1982                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1983                         goto out_no_sec;
1984         case 5:
1985                 memset(data->context, 0, sizeof(data->context));
1986         case 6:
1987                 if (data->flags & NFS_MOUNT_VER3) {
1988                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1989                                 goto out_invalid_fh;
1990                         mntfh->size = data->root.size;
1991                         args->version = 3;
1992                 } else {
1993                         mntfh->size = NFS2_FHSIZE;
1994                         args->version = 2;
1995                 }
1996 
1997 
1998                 memcpy(mntfh->data, data->root.data, mntfh->size);
1999                 if (mntfh->size < sizeof(mntfh->data))
2000                         memset(mntfh->data + mntfh->size, 0,
2001                                sizeof(mntfh->data) - mntfh->size);
2002 
2003                 /*
2004                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
2005                  * can deal with.
2006                  */
2007                 args->flags             = data->flags & NFS_MOUNT_FLAGMASK;
2008                 args->flags             |= extra_flags;
2009                 args->rsize             = data->rsize;
2010                 args->wsize             = data->wsize;
2011                 args->timeo             = data->timeo;
2012                 args->retrans           = data->retrans;
2013                 args->acregmin          = data->acregmin;
2014                 args->acregmax          = data->acregmax;
2015                 args->acdirmin          = data->acdirmin;
2016                 args->acdirmax          = data->acdirmax;
2017                 args->need_mount        = false;
2018 
2019                 memcpy(sap, &data->addr, sizeof(data->addr));
2020                 args->nfs_server.addrlen = sizeof(data->addr);
2021                 args->nfs_server.port = ntohs(data->addr.sin_port);
2022                 if (sap->sa_family != AF_INET ||
2023                     !nfs_verify_server_address(sap))
2024                         goto out_no_address;
2025 
2026                 if (!(data->flags & NFS_MOUNT_TCP))
2027                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2028                 /* N.B. caller will free nfs_server.hostname in all cases */
2029                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2030                 args->namlen            = data->namlen;
2031                 args->bsize             = data->bsize;
2032 
2033                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2034                         args->selected_flavor = data->pseudoflavor;
2035                 else
2036                         args->selected_flavor = RPC_AUTH_UNIX;
2037                 if (!args->nfs_server.hostname)
2038                         goto out_nomem;
2039 
2040                 if (!(data->flags & NFS_MOUNT_NONLM))
2041                         args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2042                                          NFS_MOUNT_LOCAL_FCNTL);
2043                 else
2044                         args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2045                                         NFS_MOUNT_LOCAL_FCNTL);
2046                 /*
2047                  * The legacy version 6 binary mount data from userspace has a
2048                  * field used only to transport selinux information into the
2049                  * the kernel.  To continue to support that functionality we
2050                  * have a touch of selinux knowledge here in the NFS code. The
2051                  * userspace code converted context=blah to just blah so we are
2052                  * converting back to the full string selinux understands.
2053                  */
2054                 if (data->context[0]){
2055 #ifdef CONFIG_SECURITY_SELINUX
2056                         int rc;
2057                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2058                         if (!opts_str)
2059                                 return -ENOMEM;
2060                         strcpy(opts_str, "context=");
2061                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2062                         strcat(opts_str, &data->context[0]);
2063                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2064                         kfree(opts_str);
2065                         if (rc)
2066                                 return rc;
2067 #else
2068                         return -EINVAL;
2069 #endif
2070                 }
2071 
2072                 break;
2073         default:
2074                 return NFS_TEXT_DATA;
2075         }
2076 
2077         return 0;
2078 
2079 out_no_data:
2080         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2081         return -EINVAL;
2082 
2083 out_no_v3:
2084         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2085                  data->version);
2086         return -EINVAL;
2087 
2088 out_no_sec:
2089         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2090         return -EINVAL;
2091 
2092 out_nomem:
2093         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2094         return -ENOMEM;
2095 
2096 out_no_address:
2097         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2098         return -EINVAL;
2099 
2100 out_invalid_fh:
2101         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2102         return -EINVAL;
2103 }
2104 
2105 #if IS_ENABLED(CONFIG_NFS_V4)
2106 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2107                                    void *options,
2108                                    struct nfs_parsed_mount_data *args,
2109                                    struct nfs_fh *mntfh,
2110                                    const char *dev_name)
2111 {
2112         if (fs_type == &nfs_fs_type)
2113                 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2114         return nfs4_validate_mount_data(options, args, dev_name);
2115 }
2116 #else
2117 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2118                                    void *options,
2119                                    struct nfs_parsed_mount_data *args,
2120                                    struct nfs_fh *mntfh,
2121                                    const char *dev_name)
2122 {
2123         return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2124 }
2125 #endif
2126 
2127 static int nfs_validate_text_mount_data(void *options,
2128                                         struct nfs_parsed_mount_data *args,
2129                                         const char *dev_name)
2130 {
2131         int port = 0;
2132         int max_namelen = PAGE_SIZE;
2133         int max_pathlen = NFS_MAXPATHLEN;
2134         struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2135 
2136         if (nfs_parse_mount_options((char *)options, args) == 0)
2137                 return -EINVAL;
2138 
2139         if (!nfs_verify_server_address(sap))
2140                 goto out_no_address;
2141 
2142         if (args->version == 4) {
2143 #if IS_ENABLED(CONFIG_NFS_V4)
2144                 port = NFS_PORT;
2145                 max_namelen = NFS4_MAXNAMLEN;
2146                 max_pathlen = NFS4_MAXPATHLEN;
2147                 nfs_validate_transport_protocol(args);
2148                 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2149                         goto out_invalid_transport_udp;
2150                 nfs4_validate_mount_flags(args);
2151 #else
2152                 goto out_v4_not_compiled;
2153 #endif /* CONFIG_NFS_V4 */
2154         } else
2155                 nfs_set_mount_transport_protocol(args);
2156 
2157         nfs_set_port(sap, &args->nfs_server.port, port);
2158 
2159         return nfs_parse_devname(dev_name,
2160                                    &args->nfs_server.hostname,
2161                                    max_namelen,
2162                                    &args->nfs_server.export_path,
2163                                    max_pathlen);
2164 
2165 #if !IS_ENABLED(CONFIG_NFS_V4)
2166 out_v4_not_compiled:
2167         dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2168         return -EPROTONOSUPPORT;
2169 #else
2170 out_invalid_transport_udp:
2171         dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2172         return -EINVAL;
2173 #endif /* !CONFIG_NFS_V4 */
2174 
2175 out_no_address:
2176         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2177         return -EINVAL;
2178 }
2179 
2180 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2181                 | NFS_MOUNT_SECURE \
2182                 | NFS_MOUNT_TCP \
2183                 | NFS_MOUNT_VER3 \
2184                 | NFS_MOUNT_KERBEROS \
2185                 | NFS_MOUNT_NONLM \
2186                 | NFS_MOUNT_BROKEN_SUID \
2187                 | NFS_MOUNT_STRICTLOCK \
2188                 | NFS_MOUNT_LEGACY_INTERFACE)
2189 
2190 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2191                 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2192 
2193 static int
2194 nfs_compare_remount_data(struct nfs_server *nfss,
2195                          struct nfs_parsed_mount_data *data)
2196 {
2197         if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2198             data->rsize != nfss->rsize ||
2199             data->wsize != nfss->wsize ||
2200             data->version != nfss->nfs_client->rpc_ops->version ||
2201             data->minorversion != nfss->nfs_client->cl_minorversion ||
2202             data->retrans != nfss->client->cl_timeout->to_retries ||
2203             data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2204             data->acregmin != nfss->acregmin / HZ ||
2205             data->acregmax != nfss->acregmax / HZ ||
2206             data->acdirmin != nfss->acdirmin / HZ ||
2207             data->acdirmax != nfss->acdirmax / HZ ||
2208             data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2209             data->nfs_server.port != nfss->port ||
2210             data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2211             !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2212                           (struct sockaddr *)&nfss->nfs_client->cl_addr))
2213                 return -EINVAL;
2214 
2215         return 0;
2216 }
2217 
2218 int
2219 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2220 {
2221         int error;
2222         struct nfs_server *nfss = sb->s_fs_info;
2223         struct nfs_parsed_mount_data *data;
2224         struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2225         struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2226         u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2227 
2228         sync_filesystem(sb);
2229 
2230         /*
2231          * Userspace mount programs that send binary options generally send
2232          * them populated with default values. We have no way to know which
2233          * ones were explicitly specified. Fall back to legacy behavior and
2234          * just return success.
2235          */
2236         if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2237             (nfsvers <= 3 && (!options || (options->version >= 1 &&
2238                                            options->version <= 6))))
2239                 return 0;
2240 
2241         data = kzalloc(sizeof(*data), GFP_KERNEL);
2242         if (data == NULL)
2243                 return -ENOMEM;
2244 
2245         /* fill out struct with values from existing mount */
2246         data->flags = nfss->flags;
2247         data->rsize = nfss->rsize;
2248         data->wsize = nfss->wsize;
2249         data->retrans = nfss->client->cl_timeout->to_retries;
2250         data->selected_flavor = nfss->client->cl_auth->au_flavor;
2251         data->auth_info = nfss->auth_info;
2252         data->acregmin = nfss->acregmin / HZ;
2253         data->acregmax = nfss->acregmax / HZ;
2254         data->acdirmin = nfss->acdirmin / HZ;
2255         data->acdirmax = nfss->acdirmax / HZ;
2256         data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2257         data->nfs_server.port = nfss->port;
2258         data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2259         data->version = nfsvers;
2260         data->minorversion = nfss->nfs_client->cl_minorversion;
2261         data->net = current->nsproxy->net_ns;
2262         memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2263                 data->nfs_server.addrlen);
2264 
2265         /* overwrite those values with any that were specified */
2266         error = -EINVAL;
2267         if (!nfs_parse_mount_options((char *)options, data))
2268                 goto out;
2269 
2270         /*
2271          * noac is a special case. It implies -o sync, but that's not
2272          * necessarily reflected in the mtab options. do_remount_sb
2273          * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2274          * remount options, so we have to explicitly reset it.
2275          */
2276         if (data->flags & NFS_MOUNT_NOAC)
2277                 *flags |= MS_SYNCHRONOUS;
2278 
2279         /* compare new mount options with old ones */
2280         error = nfs_compare_remount_data(nfss, data);
2281 out:
2282         kfree(data);
2283         return error;
2284 }
2285 EXPORT_SYMBOL_GPL(nfs_remount);
2286 
2287 /*
2288  * Initialise the common bits of the superblock
2289  */
2290 inline void nfs_initialise_sb(struct super_block *sb)
2291 {
2292         struct nfs_server *server = NFS_SB(sb);
2293 
2294         sb->s_magic = NFS_SUPER_MAGIC;
2295 
2296         /* We probably want something more informative here */
2297         snprintf(sb->s_id, sizeof(sb->s_id),
2298                  "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2299 
2300         if (sb->s_blocksize == 0)
2301                 sb->s_blocksize = nfs_block_bits(server->wsize,
2302                                                  &sb->s_blocksize_bits);
2303 
2304         sb->s_bdi = &server->backing_dev_info;
2305 
2306         nfs_super_set_maxbytes(sb, server->maxfilesize);
2307 }
2308 
2309 /*
2310  * Finish setting up an NFS2/3 superblock
2311  */
2312 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2313 {
2314         struct nfs_parsed_mount_data *data = mount_info->parsed;
2315         struct nfs_server *server = NFS_SB(sb);
2316 
2317         sb->s_blocksize_bits = 0;
2318         sb->s_blocksize = 0;
2319         sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2320         sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2321         if (data && data->bsize)
2322                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2323 
2324         if (server->nfs_client->rpc_ops->version != 2) {
2325                 /* The VFS shouldn't apply the umask to mode bits. We will do
2326                  * so ourselves when necessary.
2327                  */
2328                 sb->s_flags |= MS_POSIXACL;
2329                 sb->s_time_gran = 1;
2330         }
2331 
2332         nfs_initialise_sb(sb);
2333 }
2334 EXPORT_SYMBOL_GPL(nfs_fill_super);
2335 
2336 /*
2337  * Finish setting up a cloned NFS2/3/4 superblock
2338  */
2339 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2340 {
2341         const struct super_block *old_sb = mount_info->cloned->sb;
2342         struct nfs_server *server = NFS_SB(sb);
2343 
2344         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2345         sb->s_blocksize = old_sb->s_blocksize;
2346         sb->s_maxbytes = old_sb->s_maxbytes;
2347         sb->s_xattr = old_sb->s_xattr;
2348         sb->s_op = old_sb->s_op;
2349         sb->s_time_gran = 1;
2350 
2351         if (server->nfs_client->rpc_ops->version != 2) {
2352                 /* The VFS shouldn't apply the umask to mode bits. We will do
2353                  * so ourselves when necessary.
2354                  */
2355                 sb->s_flags |= MS_POSIXACL;
2356         }
2357 
2358         nfs_initialise_sb(sb);
2359 }
2360 
2361 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2362 {
2363         const struct nfs_server *a = s->s_fs_info;
2364         const struct rpc_clnt *clnt_a = a->client;
2365         const struct rpc_clnt *clnt_b = b->client;
2366 
2367         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2368                 goto Ebusy;
2369         if (a->nfs_client != b->nfs_client)
2370                 goto Ebusy;
2371         if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2372                 goto Ebusy;
2373         if (a->wsize != b->wsize)
2374                 goto Ebusy;
2375         if (a->rsize != b->rsize)
2376                 goto Ebusy;
2377         if (a->acregmin != b->acregmin)
2378                 goto Ebusy;
2379         if (a->acregmax != b->acregmax)
2380                 goto Ebusy;
2381         if (a->acdirmin != b->acdirmin)
2382                 goto Ebusy;
2383         if (a->acdirmax != b->acdirmax)
2384                 goto Ebusy;
2385         if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2386                 goto Ebusy;
2387         return 1;
2388 Ebusy:
2389         return 0;
2390 }
2391 
2392 struct nfs_sb_mountdata {
2393         struct nfs_server *server;
2394         int mntflags;
2395 };
2396 
2397 static int nfs_set_super(struct super_block *s, void *data)
2398 {
2399         struct nfs_sb_mountdata *sb_mntdata = data;
2400         struct nfs_server *server = sb_mntdata->server;
2401         int ret;
2402 
2403         s->s_flags = sb_mntdata->mntflags;
2404         s->s_fs_info = server;
2405         s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2406         ret = set_anon_super(s, server);
2407         if (ret == 0)
2408                 server->s_dev = s->s_dev;
2409         return ret;
2410 }
2411 
2412 static int nfs_compare_super_address(struct nfs_server *server1,
2413                                      struct nfs_server *server2)
2414 {
2415         struct sockaddr *sap1, *sap2;
2416 
2417         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2418         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2419 
2420         if (sap1->sa_family != sap2->sa_family)
2421                 return 0;
2422 
2423         switch (sap1->sa_family) {
2424         case AF_INET: {
2425                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2426                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2427                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2428                         return 0;
2429                 if (sin1->sin_port != sin2->sin_port)
2430                         return 0;
2431                 break;
2432         }
2433         case AF_INET6: {
2434                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2435                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2436                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2437                         return 0;
2438                 if (sin1->sin6_port != sin2->sin6_port)
2439                         return 0;
2440                 break;
2441         }
2442         default:
2443                 return 0;
2444         }
2445 
2446         return 1;
2447 }
2448 
2449 static int nfs_compare_super(struct super_block *sb, void *data)
2450 {
2451         struct nfs_sb_mountdata *sb_mntdata = data;
2452         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2453         int mntflags = sb_mntdata->mntflags;
2454 
2455         if (!nfs_compare_super_address(old, server))
2456                 return 0;
2457         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2458         if (old->flags & NFS_MOUNT_UNSHARED)
2459                 return 0;
2460         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2461                 return 0;
2462         return nfs_compare_mount_options(sb, server, mntflags);
2463 }
2464 
2465 #ifdef CONFIG_NFS_FSCACHE
2466 static void nfs_get_cache_cookie(struct super_block *sb,
2467                                  struct nfs_parsed_mount_data *parsed,
2468                                  struct nfs_clone_mount *cloned)
2469 {
2470         struct nfs_server *nfss = NFS_SB(sb);
2471         char *uniq = NULL;
2472         int ulen = 0;
2473 
2474         nfss->fscache_key = NULL;
2475         nfss->fscache = NULL;
2476 
2477         if (parsed) {
2478                 if (!(parsed->options & NFS_OPTION_FSCACHE))
2479                         return;
2480                 if (parsed->fscache_uniq) {
2481                         uniq = parsed->fscache_uniq;
2482                         ulen = strlen(parsed->fscache_uniq);
2483                 }
2484         } else if (cloned) {
2485                 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2486                 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2487                         return;
2488                 if (mnt_s->fscache_key) {
2489                         uniq = mnt_s->fscache_key->key.uniquifier;
2490                         ulen = mnt_s->fscache_key->key.uniq_len;
2491                 };
2492         } else
2493                 return;
2494 
2495         nfs_fscache_get_super_cookie(sb, uniq, ulen);
2496 }
2497 #else
2498 static void nfs_get_cache_cookie(struct super_block *sb,
2499                                  struct nfs_parsed_mount_data *parsed,
2500                                  struct nfs_clone_mount *cloned)
2501 {
2502 }
2503 #endif
2504 
2505 static int nfs_bdi_register(struct nfs_server *server)
2506 {
2507         return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2508 }
2509 
2510 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2511                         struct nfs_mount_info *mount_info)
2512 {
2513         int error;
2514         unsigned long kflags = 0, kflags_out = 0;
2515         if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2516                 kflags |= SECURITY_LSM_NATIVE_LABELS;
2517 
2518         error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2519                                                 kflags, &kflags_out);
2520         if (error)
2521                 goto err;
2522 
2523         if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2524                 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2525                 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2526 err:
2527         return error;
2528 }
2529 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2530 
2531 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2532                           struct nfs_mount_info *mount_info)
2533 {
2534         /* clone any lsm security options from the parent to the new sb */
2535         if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2536                 return -ESTALE;
2537         return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2538 }
2539 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2540 
2541 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2542                                    int flags, const char *dev_name,
2543                                    struct nfs_mount_info *mount_info,
2544                                    struct nfs_subversion *nfs_mod)
2545 {
2546         struct super_block *s;
2547         struct dentry *mntroot = ERR_PTR(-ENOMEM);
2548         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2549         struct nfs_sb_mountdata sb_mntdata = {
2550                 .mntflags = flags,
2551                 .server = server,
2552         };
2553         int error;
2554 
2555         if (server->flags & NFS_MOUNT_UNSHARED)
2556                 compare_super = NULL;
2557 
2558         /* -o noac implies -o sync */
2559         if (server->flags & NFS_MOUNT_NOAC)
2560                 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2561 
2562         if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2563                 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2564                         sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2565 
2566         /* Get a superblock - note that we may end up sharing one that already exists */
2567         s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2568         if (IS_ERR(s)) {
2569                 mntroot = ERR_CAST(s);
2570                 goto out_err_nosb;
2571         }
2572 
2573         if (s->s_fs_info != server) {
2574                 nfs_free_server(server);
2575                 server = NULL;
2576         } else {
2577                 error = nfs_bdi_register(server);
2578                 if (error) {
2579                         mntroot = ERR_PTR(error);
2580                         goto error_splat_bdi;
2581                 }
2582                 server->super = s;
2583         }
2584 
2585         if (!s->s_root) {
2586                 /* initial superblock/root creation */
2587                 mount_info->fill_super(s, mount_info);
2588                 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2589         }
2590 
2591         mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2592         if (IS_ERR(mntroot))
2593                 goto error_splat_super;
2594 
2595         error = mount_info->set_security(s, mntroot, mount_info);
2596         if (error)
2597                 goto error_splat_root;
2598 
2599         s->s_flags |= MS_ACTIVE;
2600 
2601 out:
2602         return mntroot;
2603 
2604 out_err_nosb:
2605         nfs_free_server(server);
2606         goto out;
2607 
2608 error_splat_root:
2609         dput(mntroot);
2610         mntroot = ERR_PTR(error);
2611 error_splat_super:
2612         if (server && !s->s_root)
2613                 bdi_unregister(&server->backing_dev_info);
2614 error_splat_bdi:
2615         deactivate_locked_super(s);
2616         goto out;
2617 }
2618 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2619 
2620 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2621         int flags, const char *dev_name, void *raw_data)
2622 {
2623         struct nfs_mount_info mount_info = {
2624                 .fill_super = nfs_fill_super,
2625                 .set_security = nfs_set_sb_security,
2626         };
2627         struct dentry *mntroot = ERR_PTR(-ENOMEM);
2628         struct nfs_subversion *nfs_mod;
2629         int error;
2630 
2631         mount_info.parsed = nfs_alloc_parsed_mount_data();
2632         mount_info.mntfh = nfs_alloc_fhandle();
2633         if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2634                 goto out;
2635 
2636         /* Validate the mount data */
2637         error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2638         if (error == NFS_TEXT_DATA)
2639                 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2640         if (error < 0) {
2641                 mntroot = ERR_PTR(error);
2642                 goto out;
2643         }
2644 
2645         nfs_mod = get_nfs_version(mount_info.parsed->version);
2646         if (IS_ERR(nfs_mod)) {
2647                 mntroot = ERR_CAST(nfs_mod);
2648                 goto out;
2649         }
2650 
2651         mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2652 
2653         put_nfs_version(nfs_mod);
2654 out:
2655         nfs_free_parsed_mount_data(mount_info.parsed);
2656         nfs_free_fhandle(mount_info.mntfh);
2657         return mntroot;
2658 }
2659 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2660 
2661 /*
2662  * Ensure that we unregister the bdi before kill_anon_super
2663  * releases the device name
2664  */
2665 void nfs_put_super(struct super_block *s)
2666 {
2667         struct nfs_server *server = NFS_SB(s);
2668 
2669         bdi_unregister(&server->backing_dev_info);
2670 }
2671 EXPORT_SYMBOL_GPL(nfs_put_super);
2672 
2673 /*
2674  * Destroy an NFS2/3 superblock
2675  */
2676 void nfs_kill_super(struct super_block *s)
2677 {
2678         struct nfs_server *server = NFS_SB(s);
2679 
2680         kill_anon_super(s);
2681         nfs_fscache_release_super_cookie(s);
2682         nfs_free_server(server);
2683 }
2684 EXPORT_SYMBOL_GPL(nfs_kill_super);
2685 
2686 /*
2687  * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2688  */
2689 static struct dentry *
2690 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2691                 const char *dev_name, void *raw_data)
2692 {
2693         struct nfs_clone_mount *data = raw_data;
2694         struct nfs_mount_info mount_info = {
2695                 .fill_super = nfs_clone_super,
2696                 .set_security = nfs_clone_sb_security,
2697                 .cloned = data,
2698         };
2699         struct nfs_server *server;
2700         struct dentry *mntroot = ERR_PTR(-ENOMEM);
2701         struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2702 
2703         dprintk("--> nfs_xdev_mount()\n");
2704 
2705         mount_info.mntfh = mount_info.cloned->fh;
2706 
2707         /* create a new volume representation */
2708         server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2709 
2710         if (IS_ERR(server))
2711                 mntroot = ERR_CAST(server);
2712         else
2713                 mntroot = nfs_fs_mount_common(server, flags,
2714                                 dev_name, &mount_info, nfs_mod);
2715 
2716         dprintk("<-- nfs_xdev_mount() = %ld\n",
2717                         IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2718         return mntroot;
2719 }
2720 
2721 #if IS_ENABLED(CONFIG_NFS_V4)
2722 
2723 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2724 {
2725         args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2726                          NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2727 }
2728 
2729 /*
2730  * Validate NFSv4 mount options
2731  */
2732 static int nfs4_validate_mount_data(void *options,
2733                                     struct nfs_parsed_mount_data *args,
2734                                     const char *dev_name)
2735 {
2736         struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2737         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2738         char *c;
2739 
2740         if (data == NULL)
2741                 goto out_no_data;
2742 
2743         args->version = 4;
2744 
2745         switch (data->version) {
2746         case 1:
2747                 if (data->host_addrlen > sizeof(args->nfs_server.address))
2748                         goto out_no_address;
2749                 if (data->host_addrlen == 0)
2750                         goto out_no_address;
2751                 args->nfs_server.addrlen = data->host_addrlen;
2752                 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2753                         return -EFAULT;
2754                 if (!nfs_verify_server_address(sap))
2755                         goto out_no_address;
2756                 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2757 
2758                 if (data->auth_flavourlen) {
2759                         rpc_authflavor_t pseudoflavor;
2760                         if (data->auth_flavourlen > 1)
2761                                 goto out_inval_auth;
2762                         if (copy_from_user(&pseudoflavor,
2763                                            data->auth_flavours,
2764                                            sizeof(pseudoflavor)))
2765                                 return -EFAULT;
2766                         args->selected_flavor = pseudoflavor;
2767                 } else
2768                         args->selected_flavor = RPC_AUTH_UNIX;
2769 
2770                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2771                 if (IS_ERR(c))
2772                         return PTR_ERR(c);
2773                 args->nfs_server.hostname = c;
2774 
2775                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2776                 if (IS_ERR(c))
2777                         return PTR_ERR(c);
2778                 args->nfs_server.export_path = c;
2779                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2780 
2781                 c = strndup_user(data->client_addr.data, 16);
2782                 if (IS_ERR(c))
2783                         return PTR_ERR(c);
2784                 args->client_address = c;
2785 
2786                 /*
2787                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2788                  * can deal with.
2789                  */
2790 
2791                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
2792                 args->rsize     = data->rsize;
2793                 args->wsize     = data->wsize;
2794                 args->timeo     = data->timeo;
2795                 args->retrans   = data->retrans;
2796                 args->acregmin  = data->acregmin;
2797                 args->acregmax  = data->acregmax;
2798                 args->acdirmin  = data->acdirmin;
2799                 args->acdirmax  = data->acdirmax;
2800                 args->nfs_server.protocol = data->proto;
2801                 nfs_validate_transport_protocol(args);
2802                 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2803                         goto out_invalid_transport_udp;
2804 
2805                 break;
2806         default:
2807                 return NFS_TEXT_DATA;
2808         }
2809 
2810         return 0;
2811 
2812 out_no_data:
2813         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2814         return -EINVAL;
2815 
2816 out_inval_auth:
2817         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2818                  data->auth_flavourlen);
2819         return -EINVAL;
2820 
2821 out_no_address:
2822         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2823         return -EINVAL;
2824 
2825 out_invalid_transport_udp:
2826         dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2827         return -EINVAL;
2828 }
2829 
2830 /*
2831  * NFS v4 module parameters need to stay in the
2832  * NFS client for backwards compatibility
2833  */
2834 unsigned int nfs_callback_set_tcpport;
2835 unsigned short nfs_callback_tcpport;
2836 /* Default cache timeout is 10 minutes */
2837 unsigned int nfs_idmap_cache_timeout = 600;
2838 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2839 bool nfs4_disable_idmapping = true;
2840 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2841 unsigned short send_implementation_id = 1;
2842 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2843 bool recover_lost_locks = false;
2844 
2845 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2846 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2847 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2848 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2849 EXPORT_SYMBOL_GPL(max_session_slots);
2850 EXPORT_SYMBOL_GPL(send_implementation_id);
2851 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2852 EXPORT_SYMBOL_GPL(recover_lost_locks);
2853 
2854 #define NFS_CALLBACK_MAXPORTNR (65535U)
2855 
2856 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2857 {
2858         unsigned long num;
2859         int ret;
2860 
2861         if (!val)
2862                 return -EINVAL;
2863         ret = kstrtoul(val, 0, &num);
2864         if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2865                 return -EINVAL;
2866         *((unsigned int *)kp->arg) = num;
2867         return 0;
2868 }
2869 static struct kernel_param_ops param_ops_portnr = {
2870         .set = param_set_portnr,
2871         .get = param_get_uint,
2872 };
2873 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2874 
2875 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2876 module_param(nfs_idmap_cache_timeout, int, 0644);
2877 module_param(nfs4_disable_idmapping, bool, 0644);
2878 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2879                         NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2880 MODULE_PARM_DESC(nfs4_disable_idmapping,
2881                 "Turn off NFSv4 idmapping when using 'sec=sys'");
2882 module_param(max_session_slots, ushort, 0644);
2883 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2884                 "requests the client will negotiate");
2885 module_param(send_implementation_id, ushort, 0644);
2886 MODULE_PARM_DESC(send_implementation_id,
2887                 "Send implementation ID with NFSv4.1 exchange_id");
2888 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2889 
2890 module_param(recover_lost_locks, bool, 0644);
2891 MODULE_PARM_DESC(recover_lost_locks,
2892                  "If the server reports that a lock might be lost, "
2893                  "try to recover it risking data corruption.");
2894 
2895 
2896 #endif /* CONFIG_NFS_V4 */
2897 

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