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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/vfs.h>
 47 #include <linux/inet.h>
 48 #include <linux/in6.h>
 49 #include <linux/slab.h>
 50 #include <net/ipv6.h>
 51 #include <linux/netdevice.h>
 52 #include <linux/nfs_xdr.h>
 53 #include <linux/magic.h>
 54 #include <linux/parser.h>
 55 #include <linux/nsproxy.h>
 56 #include <linux/rcupdate.h>
 57 
 58 #include <linux/uaccess.h>
 59 
 60 #include "nfs4_fs.h"
 61 #include "callback.h"
 62 #include "delegation.h"
 63 #include "iostat.h"
 64 #include "internal.h"
 65 #include "fscache.h"
 66 #include "nfs4session.h"
 67 #include "pnfs.h"
 68 #include "nfs.h"
 69 
 70 #define NFSDBG_FACILITY         NFSDBG_VFS
 71 #define NFS_TEXT_DATA           1
 72 
 73 #if IS_ENABLED(CONFIG_NFS_V3)
 74 #define NFS_DEFAULT_VERSION 3
 75 #else
 76 #define NFS_DEFAULT_VERSION 2
 77 #endif
 78 
 79 enum {
 80         /* Mount options that take no arguments */
 81         Opt_soft, Opt_hard,
 82         Opt_posix, Opt_noposix,
 83         Opt_cto, Opt_nocto,
 84         Opt_ac, Opt_noac,
 85         Opt_lock, Opt_nolock,
 86         Opt_udp, Opt_tcp, Opt_rdma,
 87         Opt_acl, Opt_noacl,
 88         Opt_rdirplus, Opt_nordirplus,
 89         Opt_sharecache, Opt_nosharecache,
 90         Opt_resvport, Opt_noresvport,
 91         Opt_fscache, Opt_nofscache,
 92         Opt_migration, Opt_nomigration,
 93 
 94         /* Mount options that take integer arguments */
 95         Opt_port,
 96         Opt_rsize, Opt_wsize, Opt_bsize,
 97         Opt_timeo, Opt_retrans,
 98         Opt_acregmin, Opt_acregmax,
 99         Opt_acdirmin, Opt_acdirmax,
100         Opt_actimeo,
101         Opt_namelen,
102         Opt_mountport,
103         Opt_mountvers,
104         Opt_minorversion,
105 
106         /* Mount options that take string arguments */
107         Opt_nfsvers,
108         Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
109         Opt_addr, Opt_mountaddr, Opt_clientaddr,
110         Opt_lookupcache,
111         Opt_fscache_uniq,
112         Opt_local_lock,
113 
114         /* Special mount options */
115         Opt_userspace, Opt_deprecated, Opt_sloppy,
116 
117         Opt_err
118 };
119 
120 static const match_table_t nfs_mount_option_tokens = {
121         { Opt_userspace, "bg" },
122         { Opt_userspace, "fg" },
123         { Opt_userspace, "retry=%s" },
124 
125         { Opt_sloppy, "sloppy" },
126 
127         { Opt_soft, "soft" },
128         { Opt_hard, "hard" },
129         { Opt_deprecated, "intr" },
130         { Opt_deprecated, "nointr" },
131         { Opt_posix, "posix" },
132         { Opt_noposix, "noposix" },
133         { Opt_cto, "cto" },
134         { Opt_nocto, "nocto" },
135         { Opt_ac, "ac" },
136         { Opt_noac, "noac" },
137         { Opt_lock, "lock" },
138         { Opt_nolock, "nolock" },
139         { Opt_udp, "udp" },
140         { Opt_tcp, "tcp" },
141         { Opt_rdma, "rdma" },
142         { Opt_acl, "acl" },
143         { Opt_noacl, "noacl" },
144         { Opt_rdirplus, "rdirplus" },
145         { Opt_nordirplus, "nordirplus" },
146         { Opt_sharecache, "sharecache" },
147         { Opt_nosharecache, "nosharecache" },
148         { Opt_resvport, "resvport" },
149         { Opt_noresvport, "noresvport" },
150         { Opt_fscache, "fsc" },
151         { Opt_nofscache, "nofsc" },
152         { Opt_migration, "migration" },
153         { Opt_nomigration, "nomigration" },
154 
155         { Opt_port, "port=%s" },
156         { Opt_rsize, "rsize=%s" },
157         { Opt_wsize, "wsize=%s" },
158         { Opt_bsize, "bsize=%s" },
159         { Opt_timeo, "timeo=%s" },
160         { Opt_retrans, "retrans=%s" },
161         { Opt_acregmin, "acregmin=%s" },
162         { Opt_acregmax, "acregmax=%s" },
163         { Opt_acdirmin, "acdirmin=%s" },
164         { Opt_acdirmax, "acdirmax=%s" },
165         { Opt_actimeo, "actimeo=%s" },
166         { Opt_namelen, "namlen=%s" },
167         { Opt_mountport, "mountport=%s" },
168         { Opt_mountvers, "mountvers=%s" },
169         { Opt_minorversion, "minorversion=%s" },
170 
171         { Opt_nfsvers, "nfsvers=%s" },
172         { Opt_nfsvers, "vers=%s" },
173 
174         { Opt_sec, "sec=%s" },
175         { Opt_proto, "proto=%s" },
176         { Opt_mountproto, "mountproto=%s" },
177         { Opt_addr, "addr=%s" },
178         { Opt_clientaddr, "clientaddr=%s" },
179         { Opt_mounthost, "mounthost=%s" },
180         { Opt_mountaddr, "mountaddr=%s" },
181 
182         { Opt_lookupcache, "lookupcache=%s" },
183         { Opt_fscache_uniq, "fsc=%s" },
184         { Opt_local_lock, "local_lock=%s" },
185 
186         /* The following needs to be listed after all other options */
187         { Opt_nfsvers, "v%s" },
188 
189         { Opt_err, NULL }
190 };
191 
192 enum {
193         Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
194         Opt_xprt_rdma6,
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         { Opt_xprt_rdma6, "rdma6" },
206 
207         { Opt_xprt_err, NULL }
208 };
209 
210 enum {
211         Opt_sec_none, Opt_sec_sys,
212         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
213         Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
214         Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
215 
216         Opt_sec_err
217 };
218 
219 static const match_table_t nfs_secflavor_tokens = {
220         { Opt_sec_none, "none" },
221         { Opt_sec_none, "null" },
222         { Opt_sec_sys, "sys" },
223 
224         { Opt_sec_krb5, "krb5" },
225         { Opt_sec_krb5i, "krb5i" },
226         { Opt_sec_krb5p, "krb5p" },
227 
228         { Opt_sec_lkey, "lkey" },
229         { Opt_sec_lkeyi, "lkeyi" },
230         { Opt_sec_lkeyp, "lkeyp" },
231 
232         { Opt_sec_spkm, "spkm3" },
233         { Opt_sec_spkmi, "spkm3i" },
234         { Opt_sec_spkmp, "spkm3p" },
235 
236         { Opt_sec_err, NULL }
237 };
238 
239 enum {
240         Opt_lookupcache_all, Opt_lookupcache_positive,
241         Opt_lookupcache_none,
242 
243         Opt_lookupcache_err
244 };
245 
246 static match_table_t nfs_lookupcache_tokens = {
247         { Opt_lookupcache_all, "all" },
248         { Opt_lookupcache_positive, "pos" },
249         { Opt_lookupcache_positive, "positive" },
250         { Opt_lookupcache_none, "none" },
251 
252         { Opt_lookupcache_err, NULL }
253 };
254 
255 enum {
256         Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
257         Opt_local_lock_none,
258 
259         Opt_local_lock_err
260 };
261 
262 static match_table_t nfs_local_lock_tokens = {
263         { Opt_local_lock_all, "all" },
264         { Opt_local_lock_flock, "flock" },
265         { Opt_local_lock_posix, "posix" },
266         { Opt_local_lock_none, "none" },
267 
268         { Opt_local_lock_err, NULL }
269 };
270 
271 enum {
272         Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
273         Opt_vers_4_1, Opt_vers_4_2,
274 
275         Opt_vers_err
276 };
277 
278 static match_table_t nfs_vers_tokens = {
279         { Opt_vers_2, "2" },
280         { Opt_vers_3, "3" },
281         { Opt_vers_4, "4" },
282         { Opt_vers_4_0, "4.0" },
283         { Opt_vers_4_1, "4.1" },
284         { Opt_vers_4_2, "4.2" },
285 
286         { Opt_vers_err, NULL }
287 };
288 
289 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
290                 int flags, const char *dev_name, void *raw_data);
291 
292 struct file_system_type nfs_fs_type = {
293         .owner          = THIS_MODULE,
294         .name           = "nfs",
295         .mount          = nfs_fs_mount,
296         .kill_sb        = nfs_kill_super,
297         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
298 };
299 MODULE_ALIAS_FS("nfs");
300 EXPORT_SYMBOL_GPL(nfs_fs_type);
301 
302 struct file_system_type nfs_xdev_fs_type = {
303         .owner          = THIS_MODULE,
304         .name           = "nfs",
305         .mount          = nfs_xdev_mount,
306         .kill_sb        = nfs_kill_super,
307         .fs_flags       = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
308 };
309 
310 const struct super_operations nfs_sops = {
311         .alloc_inode    = nfs_alloc_inode,
312         .destroy_inode  = nfs_destroy_inode,
313         .write_inode    = nfs_write_inode,
314         .drop_inode     = nfs_drop_inode,
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         ret = register_shrinker(&acl_shrinker);
387         if (ret < 0)
388                 goto error_3;
389         return 0;
390 error_3:
391         nfs_unregister_sysctl();
392 error_2:
393         unregister_nfs4_fs();
394 error_1:
395         unregister_filesystem(&nfs_fs_type);
396 error_0:
397         return ret;
398 }
399 
400 /*
401  * Unregister the NFS filesystems
402  */
403 void __exit unregister_nfs_fs(void)
404 {
405         unregister_shrinker(&acl_shrinker);
406         nfs_unregister_sysctl();
407         unregister_nfs4_fs();
408         unregister_filesystem(&nfs_fs_type);
409 }
410 
411 bool nfs_sb_active(struct super_block *sb)
412 {
413         struct nfs_server *server = NFS_SB(sb);
414 
415         if (!atomic_inc_not_zero(&sb->s_active))
416                 return false;
417         if (atomic_inc_return(&server->active) != 1)
418                 atomic_dec(&sb->s_active);
419         return true;
420 }
421 EXPORT_SYMBOL_GPL(nfs_sb_active);
422 
423 void nfs_sb_deactive(struct super_block *sb)
424 {
425         struct nfs_server *server = NFS_SB(sb);
426 
427         if (atomic_dec_and_test(&server->active))
428                 deactivate_super(sb);
429 }
430 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
431 
432 /*
433  * Deliver file system statistics to userspace
434  */
435 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
436 {
437         struct nfs_server *server = NFS_SB(dentry->d_sb);
438         unsigned char blockbits;
439         unsigned long blockres;
440         struct nfs_fh *fh = NFS_FH(d_inode(dentry));
441         struct nfs_fsstat res;
442         int error = -ENOMEM;
443 
444         res.fattr = nfs_alloc_fattr();
445         if (res.fattr == NULL)
446                 goto out_err;
447 
448         error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
449         if (unlikely(error == -ESTALE)) {
450                 struct dentry *pd_dentry;
451 
452                 pd_dentry = dget_parent(dentry);
453                 if (pd_dentry != NULL) {
454                         nfs_zap_caches(d_inode(pd_dentry));
455                         dput(pd_dentry);
456                 }
457         }
458         nfs_free_fattr(res.fattr);
459         if (error < 0)
460                 goto out_err;
461 
462         buf->f_type = NFS_SUPER_MAGIC;
463 
464         /*
465          * Current versions of glibc do not correctly handle the
466          * case where f_frsize != f_bsize.  Eventually we want to
467          * report the value of wtmult in this field.
468          */
469         buf->f_frsize = dentry->d_sb->s_blocksize;
470 
471         /*
472          * On most *nix systems, f_blocks, f_bfree, and f_bavail
473          * are reported in units of f_frsize.  Linux hasn't had
474          * an f_frsize field in its statfs struct until recently,
475          * thus historically Linux's sys_statfs reports these
476          * fields in units of f_bsize.
477          */
478         buf->f_bsize = dentry->d_sb->s_blocksize;
479         blockbits = dentry->d_sb->s_blocksize_bits;
480         blockres = (1 << blockbits) - 1;
481         buf->f_blocks = (res.tbytes + blockres) >> blockbits;
482         buf->f_bfree = (res.fbytes + blockres) >> blockbits;
483         buf->f_bavail = (res.abytes + blockres) >> blockbits;
484 
485         buf->f_files = res.tfiles;
486         buf->f_ffree = res.afiles;
487 
488         buf->f_namelen = server->namelen;
489 
490         return 0;
491 
492  out_err:
493         dprintk("%s: statfs error = %d\n", __func__, -error);
494         return error;
495 }
496 EXPORT_SYMBOL_GPL(nfs_statfs);
497 
498 /*
499  * Map the security flavour number to a name
500  */
501 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
502 {
503         static const struct {
504                 rpc_authflavor_t flavour;
505                 const char *str;
506         } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
507                 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
508                 { RPC_AUTH_NULL, "null" },
509                 { RPC_AUTH_UNIX, "sys" },
510                 { RPC_AUTH_GSS_KRB5, "krb5" },
511                 { RPC_AUTH_GSS_KRB5I, "krb5i" },
512                 { RPC_AUTH_GSS_KRB5P, "krb5p" },
513                 { RPC_AUTH_GSS_LKEY, "lkey" },
514                 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
515                 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
516                 { RPC_AUTH_GSS_SPKM, "spkm" },
517                 { RPC_AUTH_GSS_SPKMI, "spkmi" },
518                 { RPC_AUTH_GSS_SPKMP, "spkmp" },
519                 { UINT_MAX, "unknown" }
520         };
521         int i;
522 
523         for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
524                 if (sec_flavours[i].flavour == flavour)
525                         break;
526         }
527         return sec_flavours[i].str;
528 }
529 
530 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
531                                   int showdefaults)
532 {
533         struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
534         char *proto = NULL;
535 
536         switch (sap->sa_family) {
537         case AF_INET:
538                 switch (nfss->mountd_protocol) {
539                 case IPPROTO_UDP:
540                         proto = RPCBIND_NETID_UDP;
541                         break;
542                 case IPPROTO_TCP:
543                         proto = RPCBIND_NETID_TCP;
544                         break;
545                 }
546                 break;
547         case AF_INET6:
548                 switch (nfss->mountd_protocol) {
549                 case IPPROTO_UDP:
550                         proto = RPCBIND_NETID_UDP6;
551                         break;
552                 case IPPROTO_TCP:
553                         proto = RPCBIND_NETID_TCP6;
554                         break;
555                 }
556                 break;
557         }
558         if (proto || showdefaults)
559                 seq_printf(m, ",mountproto=%s", proto ?: "auto");
560 }
561 
562 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
563                                     int showdefaults)
564 {
565         struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
566 
567         if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
568                 return;
569 
570         switch (sap->sa_family) {
571         case AF_INET: {
572                 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
573                 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
574                 break;
575         }
576         case AF_INET6: {
577                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
578                 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
579                 break;
580         }
581         default:
582                 if (showdefaults)
583                         seq_printf(m, ",mountaddr=unspecified");
584         }
585 
586         if (nfss->mountd_version || showdefaults)
587                 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
588         if ((nfss->mountd_port &&
589                 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
590                 showdefaults)
591                 seq_printf(m, ",mountport=%u", nfss->mountd_port);
592 
593         nfs_show_mountd_netid(m, nfss, showdefaults);
594 }
595 
596 #if IS_ENABLED(CONFIG_NFS_V4)
597 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
598                                     int showdefaults)
599 {
600         struct nfs_client *clp = nfss->nfs_client;
601 
602         seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
603 }
604 #else
605 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
606                                     int showdefaults)
607 {
608 }
609 #endif
610 
611 static void nfs_show_nfs_version(struct seq_file *m,
612                 unsigned int version,
613                 unsigned int minorversion)
614 {
615         seq_printf(m, ",vers=%u", version);
616         if (version == 4)
617                 seq_printf(m, ".%u", minorversion);
618 }
619 
620 /*
621  * Describe the mount options in force on this server representation
622  */
623 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
624                                    int showdefaults)
625 {
626         static const struct proc_nfs_info {
627                 int flag;
628                 const char *str;
629                 const char *nostr;
630         } nfs_info[] = {
631                 { NFS_MOUNT_SOFT, ",soft", ",hard" },
632                 { NFS_MOUNT_POSIX, ",posix", "" },
633                 { NFS_MOUNT_NOCTO, ",nocto", "" },
634                 { NFS_MOUNT_NOAC, ",noac", "" },
635                 { NFS_MOUNT_NONLM, ",nolock", "" },
636                 { NFS_MOUNT_NOACL, ",noacl", "" },
637                 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
638                 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
639                 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
640                 { 0, NULL, NULL }
641         };
642         const struct proc_nfs_info *nfs_infop;
643         struct nfs_client *clp = nfss->nfs_client;
644         u32 version = clp->rpc_ops->version;
645         int local_flock, local_fcntl;
646 
647         nfs_show_nfs_version(m, version, clp->cl_minorversion);
648         seq_printf(m, ",rsize=%u", nfss->rsize);
649         seq_printf(m, ",wsize=%u", nfss->wsize);
650         if (nfss->bsize != 0)
651                 seq_printf(m, ",bsize=%u", nfss->bsize);
652         seq_printf(m, ",namlen=%u", nfss->namelen);
653         if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
654                 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
655         if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
656                 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
657         if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
658                 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
659         if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
660                 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
661         for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
662                 if (nfss->flags & nfs_infop->flag)
663                         seq_puts(m, nfs_infop->str);
664                 else
665                         seq_puts(m, nfs_infop->nostr);
666         }
667         rcu_read_lock();
668         seq_printf(m, ",proto=%s",
669                    rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
670         rcu_read_unlock();
671         if (version == 4) {
672                 if (nfss->port != NFS_PORT)
673                         seq_printf(m, ",port=%u", nfss->port);
674         } else
675                 if (nfss->port)
676                         seq_printf(m, ",port=%u", nfss->port);
677 
678         seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
679         seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
680         seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
681 
682         if (version != 4)
683                 nfs_show_mountd_options(m, nfss, showdefaults);
684         else
685                 nfs_show_nfsv4_options(m, nfss, showdefaults);
686 
687         if (nfss->options & NFS_OPTION_FSCACHE)
688                 seq_printf(m, ",fsc");
689 
690         if (nfss->options & NFS_OPTION_MIGRATION)
691                 seq_printf(m, ",migration");
692 
693         if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694                 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695                         seq_printf(m, ",lookupcache=none");
696                 else
697                         seq_printf(m, ",lookupcache=pos");
698         }
699 
700         local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701         local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
702 
703         if (!local_flock && !local_fcntl)
704                 seq_printf(m, ",local_lock=none");
705         else if (local_flock && local_fcntl)
706                 seq_printf(m, ",local_lock=all");
707         else if (local_flock)
708                 seq_printf(m, ",local_lock=flock");
709         else
710                 seq_printf(m, ",local_lock=posix");
711 }
712 
713 /*
714  * Describe the mount options on this VFS mountpoint
715  */
716 int nfs_show_options(struct seq_file *m, struct dentry *root)
717 {
718         struct nfs_server *nfss = NFS_SB(root->d_sb);
719 
720         nfs_show_mount_options(m, nfss, 0);
721 
722         rcu_read_lock();
723         seq_printf(m, ",addr=%s",
724                         rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
725                                                         RPC_DISPLAY_ADDR));
726         rcu_read_unlock();
727 
728         return 0;
729 }
730 EXPORT_SYMBOL_GPL(nfs_show_options);
731 
732 #if IS_ENABLED(CONFIG_NFS_V4)
733 #ifdef CONFIG_NFS_V4_1
734 static void show_sessions(struct seq_file *m, struct nfs_server *server)
735 {
736         if (nfs4_has_session(server->nfs_client))
737                 seq_printf(m, ",sessions");
738 }
739 #else
740 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
741 #endif
742 #endif
743 
744 #ifdef CONFIG_NFS_V4_1
745 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
746 {
747         seq_printf(m, ",pnfs=");
748         if (server->pnfs_curr_ld)
749                 seq_printf(m, "%s", server->pnfs_curr_ld->name);
750         else
751                 seq_printf(m, "not configured");
752 }
753 
754 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
755 {
756         if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
757                 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
758                 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
759                            "date='%llu,%u'",
760                            impl_id->name, impl_id->domain,
761                            impl_id->date.seconds, impl_id->date.nseconds);
762         }
763 }
764 #else
765 #if IS_ENABLED(CONFIG_NFS_V4)
766 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
767 {
768 }
769 #endif
770 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
771 {
772 }
773 #endif
774 
775 int nfs_show_devname(struct seq_file *m, struct dentry *root)
776 {
777         char *page = (char *) __get_free_page(GFP_KERNEL);
778         char *devname, *dummy;
779         int err = 0;
780         if (!page)
781                 return -ENOMEM;
782         devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
783         if (IS_ERR(devname))
784                 err = PTR_ERR(devname);
785         else
786                 seq_escape(m, devname, " \t\n\\");
787         free_page((unsigned long)page);
788         return err;
789 }
790 EXPORT_SYMBOL_GPL(nfs_show_devname);
791 
792 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
793 {
794         seq_puts(m, "/");
795         return 0;
796 }
797 EXPORT_SYMBOL_GPL(nfs_show_path);
798 
799 /*
800  * Present statistical information for this VFS mountpoint
801  */
802 int nfs_show_stats(struct seq_file *m, struct dentry *root)
803 {
804         int i, cpu;
805         struct nfs_server *nfss = NFS_SB(root->d_sb);
806         struct rpc_auth *auth = nfss->client->cl_auth;
807         struct nfs_iostats totals = { };
808 
809         seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
810 
811         /*
812          * Display all mount option settings
813          */
814         seq_printf(m, "\n\topts:\t");
815         seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw");
816         seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : "");
817         seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : "");
818         seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : "");
819         nfs_show_mount_options(m, nfss, 1);
820 
821         seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
822 
823         show_implementation_id(m, nfss);
824 
825         seq_printf(m, "\n\tcaps:\t");
826         seq_printf(m, "caps=0x%x", nfss->caps);
827         seq_printf(m, ",wtmult=%u", nfss->wtmult);
828         seq_printf(m, ",dtsize=%u", nfss->dtsize);
829         seq_printf(m, ",bsize=%u", nfss->bsize);
830         seq_printf(m, ",namlen=%u", nfss->namelen);
831 
832 #if IS_ENABLED(CONFIG_NFS_V4)
833         if (nfss->nfs_client->rpc_ops->version == 4) {
834                 seq_printf(m, "\n\tnfsv4:\t");
835                 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
836                 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
837                 seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]);
838                 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
839                 show_sessions(m, nfss);
840                 show_pnfs(m, nfss);
841         }
842 #endif
843 
844         /*
845          * Display security flavor in effect for this mount
846          */
847         seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
848         if (auth->au_flavor)
849                 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
850 
851         /*
852          * Display superblock I/O counters
853          */
854         for_each_possible_cpu(cpu) {
855                 struct nfs_iostats *stats;
856 
857                 preempt_disable();
858                 stats = per_cpu_ptr(nfss->io_stats, cpu);
859 
860                 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
861                         totals.events[i] += stats->events[i];
862                 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863                         totals.bytes[i] += stats->bytes[i];
864 #ifdef CONFIG_NFS_FSCACHE
865                 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866                         totals.fscache[i] += stats->fscache[i];
867 #endif
868 
869                 preempt_enable();
870         }
871 
872         seq_printf(m, "\n\tevents:\t");
873         for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
874                 seq_printf(m, "%lu ", totals.events[i]);
875         seq_printf(m, "\n\tbytes:\t");
876         for (i = 0; i < __NFSIOS_BYTESMAX; i++)
877                 seq_printf(m, "%Lu ", totals.bytes[i]);
878 #ifdef CONFIG_NFS_FSCACHE
879         if (nfss->options & NFS_OPTION_FSCACHE) {
880                 seq_printf(m, "\n\tfsc:\t");
881                 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
882                         seq_printf(m, "%Lu ", totals.fscache[i]);
883         }
884 #endif
885         seq_printf(m, "\n");
886 
887         rpc_print_iostats(m, nfss->client);
888 
889         return 0;
890 }
891 EXPORT_SYMBOL_GPL(nfs_show_stats);
892 
893 /*
894  * Begin unmount by attempting to remove all automounted mountpoints we added
895  * in response to xdev traversals and referrals
896  */
897 void nfs_umount_begin(struct super_block *sb)
898 {
899         struct nfs_server *server;
900         struct rpc_clnt *rpc;
901 
902         server = NFS_SB(sb);
903         /* -EIO all pending I/O */
904         rpc = server->client_acl;
905         if (!IS_ERR(rpc))
906                 rpc_killall_tasks(rpc);
907         rpc = server->client;
908         if (!IS_ERR(rpc))
909                 rpc_killall_tasks(rpc);
910 }
911 EXPORT_SYMBOL_GPL(nfs_umount_begin);
912 
913 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
914 {
915         struct nfs_parsed_mount_data *data;
916 
917         data = kzalloc(sizeof(*data), GFP_KERNEL);
918         if (data) {
919                 data->timeo             = NFS_UNSPEC_TIMEO;
920                 data->retrans           = NFS_UNSPEC_RETRANS;
921                 data->acregmin          = NFS_DEF_ACREGMIN;
922                 data->acregmax          = NFS_DEF_ACREGMAX;
923                 data->acdirmin          = NFS_DEF_ACDIRMIN;
924                 data->acdirmax          = NFS_DEF_ACDIRMAX;
925                 data->mount_server.port = NFS_UNSPEC_PORT;
926                 data->nfs_server.port   = NFS_UNSPEC_PORT;
927                 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
928                 data->selected_flavor   = RPC_AUTH_MAXFLAVOR;
929                 data->minorversion      = 0;
930                 data->need_mount        = true;
931                 data->net               = current->nsproxy->net_ns;
932                 security_init_mnt_opts(&data->lsm_opts);
933         }
934         return data;
935 }
936 
937 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
938 {
939         if (data) {
940                 kfree(data->client_address);
941                 kfree(data->mount_server.hostname);
942                 kfree(data->nfs_server.export_path);
943                 kfree(data->nfs_server.hostname);
944                 kfree(data->fscache_uniq);
945                 security_free_mnt_opts(&data->lsm_opts);
946                 kfree(data);
947         }
948 }
949 
950 /*
951  * Sanity-check a server address provided by the mount command.
952  *
953  * Address family must be initialized, and address must not be
954  * the ANY address for that family.
955  */
956 static int nfs_verify_server_address(struct sockaddr *addr)
957 {
958         switch (addr->sa_family) {
959         case AF_INET: {
960                 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
961                 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
962         }
963         case AF_INET6: {
964                 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
965                 return !ipv6_addr_any(sa);
966         }
967         }
968 
969         dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
970         return 0;
971 }
972 
973 /*
974  * Select between a default port value and a user-specified port value.
975  * If a zero value is set, then autobind will be used.
976  */
977 static void nfs_set_port(struct sockaddr *sap, int *port,
978                                  const unsigned short default_port)
979 {
980         if (*port == NFS_UNSPEC_PORT)
981                 *port = default_port;
982 
983         rpc_set_port(sap, *port);
984 }
985 
986 /*
987  * Sanity check the NFS transport protocol.
988  *
989  */
990 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
991 {
992         switch (mnt->nfs_server.protocol) {
993         case XPRT_TRANSPORT_UDP:
994         case XPRT_TRANSPORT_TCP:
995         case XPRT_TRANSPORT_RDMA:
996                 break;
997         default:
998                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
999         }
1000 }
1001 
1002 /*
1003  * For text based NFSv2/v3 mounts, the mount protocol transport default
1004  * settings should depend upon the specified NFS transport.
1005  */
1006 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1007 {
1008         nfs_validate_transport_protocol(mnt);
1009 
1010         if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1011             mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1012                         return;
1013         switch (mnt->nfs_server.protocol) {
1014         case XPRT_TRANSPORT_UDP:
1015                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1016                 break;
1017         case XPRT_TRANSPORT_TCP:
1018         case XPRT_TRANSPORT_RDMA:
1019                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1020         }
1021 }
1022 
1023 /*
1024  * Add 'flavor' to 'auth_info' if not already present.
1025  * Returns true if 'flavor' ends up in the list, false otherwise
1026  */
1027 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1028                               rpc_authflavor_t flavor)
1029 {
1030         unsigned int i;
1031         unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1032 
1033         /* make sure this flavor isn't already in the list */
1034         for (i = 0; i < auth_info->flavor_len; i++) {
1035                 if (flavor == auth_info->flavors[i])
1036                         return true;
1037         }
1038 
1039         if (auth_info->flavor_len + 1 >= max_flavor_len) {
1040                 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1041                 return false;
1042         }
1043 
1044         auth_info->flavors[auth_info->flavor_len++] = flavor;
1045         return true;
1046 }
1047 
1048 /*
1049  * Return true if 'match' is in auth_info or auth_info is empty.
1050  * Return false otherwise.
1051  */
1052 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1053                          rpc_authflavor_t match)
1054 {
1055         int i;
1056 
1057         if (!auth_info->flavor_len)
1058                 return true;
1059 
1060         for (i = 0; i < auth_info->flavor_len; i++) {
1061                 if (auth_info->flavors[i] == match)
1062                         return true;
1063         }
1064         return false;
1065 }
1066 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1067 
1068 /*
1069  * Parse the value of the 'sec=' option.
1070  */
1071 static int nfs_parse_security_flavors(char *value,
1072                                       struct nfs_parsed_mount_data *mnt)
1073 {
1074         substring_t args[MAX_OPT_ARGS];
1075         rpc_authflavor_t pseudoflavor;
1076         char *p;
1077 
1078         dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1079 
1080         while ((p = strsep(&value, ":")) != NULL) {
1081                 switch (match_token(p, nfs_secflavor_tokens, args)) {
1082                 case Opt_sec_none:
1083                         pseudoflavor = RPC_AUTH_NULL;
1084                         break;
1085                 case Opt_sec_sys:
1086                         pseudoflavor = RPC_AUTH_UNIX;
1087                         break;
1088                 case Opt_sec_krb5:
1089                         pseudoflavor = RPC_AUTH_GSS_KRB5;
1090                         break;
1091                 case Opt_sec_krb5i:
1092                         pseudoflavor = RPC_AUTH_GSS_KRB5I;
1093                         break;
1094                 case Opt_sec_krb5p:
1095                         pseudoflavor = RPC_AUTH_GSS_KRB5P;
1096                         break;
1097                 case Opt_sec_lkey:
1098                         pseudoflavor = RPC_AUTH_GSS_LKEY;
1099                         break;
1100                 case Opt_sec_lkeyi:
1101                         pseudoflavor = RPC_AUTH_GSS_LKEYI;
1102                         break;
1103                 case Opt_sec_lkeyp:
1104                         pseudoflavor = RPC_AUTH_GSS_LKEYP;
1105                         break;
1106                 case Opt_sec_spkm:
1107                         pseudoflavor = RPC_AUTH_GSS_SPKM;
1108                         break;
1109                 case Opt_sec_spkmi:
1110                         pseudoflavor = RPC_AUTH_GSS_SPKMI;
1111                         break;
1112                 case Opt_sec_spkmp:
1113                         pseudoflavor = RPC_AUTH_GSS_SPKMP;
1114                         break;
1115                 default:
1116                         dfprintk(MOUNT,
1117                                  "NFS: sec= option '%s' not recognized\n", p);
1118                         return 0;
1119                 }
1120 
1121                 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1122                         return 0;
1123         }
1124 
1125         return 1;
1126 }
1127 
1128 static int nfs_parse_version_string(char *string,
1129                 struct nfs_parsed_mount_data *mnt,
1130                 substring_t *args)
1131 {
1132         mnt->flags &= ~NFS_MOUNT_VER3;
1133         switch (match_token(string, nfs_vers_tokens, args)) {
1134         case Opt_vers_2:
1135                 mnt->version = 2;
1136                 break;
1137         case Opt_vers_3:
1138                 mnt->flags |= NFS_MOUNT_VER3;
1139                 mnt->version = 3;
1140                 break;
1141         case Opt_vers_4:
1142                 /* Backward compatibility option. In future,
1143                  * the mount program should always supply
1144                  * a NFSv4 minor version number.
1145                  */
1146                 mnt->version = 4;
1147                 break;
1148         case Opt_vers_4_0:
1149                 mnt->version = 4;
1150                 mnt->minorversion = 0;
1151                 break;
1152         case Opt_vers_4_1:
1153                 mnt->version = 4;
1154                 mnt->minorversion = 1;
1155                 break;
1156         case Opt_vers_4_2:
1157                 mnt->version = 4;
1158                 mnt->minorversion = 2;
1159                 break;
1160         default:
1161                 return 0;
1162         }
1163         return 1;
1164 }
1165 
1166 static int nfs_get_option_str(substring_t args[], char **option)
1167 {
1168         kfree(*option);
1169         *option = match_strdup(args);
1170         return !*option;
1171 }
1172 
1173 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1174 {
1175         int rc;
1176         char *string;
1177 
1178         string = match_strdup(args);
1179         if (string == NULL)
1180                 return -ENOMEM;
1181         rc = kstrtoul(string, 10, option);
1182         kfree(string);
1183 
1184         return rc;
1185 }
1186 
1187 static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
1188                 unsigned long l_bound, unsigned long u_bound)
1189 {
1190         int ret;
1191 
1192         ret = nfs_get_option_ul(args, option);
1193         if (ret != 0)
1194                 return ret;
1195         if (*option < l_bound || *option > u_bound)
1196                 return -ERANGE;
1197         return 0;
1198 }
1199 
1200 /*
1201  * Error-check and convert a string of mount options from user space into
1202  * a data structure.  The whole mount string is processed; bad options are
1203  * skipped as they are encountered.  If there were no errors, return 1;
1204  * otherwise return 0 (zero).
1205  */
1206 static int nfs_parse_mount_options(char *raw,
1207                                    struct nfs_parsed_mount_data *mnt)
1208 {
1209         char *p, *string, *secdata;
1210         int rc, sloppy = 0, invalid_option = 0;
1211         unsigned short protofamily = AF_UNSPEC;
1212         unsigned short mountfamily = AF_UNSPEC;
1213 
1214         if (!raw) {
1215                 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1216                 return 1;
1217         }
1218         dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1219 
1220         secdata = alloc_secdata();
1221         if (!secdata)
1222                 goto out_nomem;
1223 
1224         rc = security_sb_copy_data(raw, secdata);
1225         if (rc)
1226                 goto out_security_failure;
1227 
1228         rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1229         if (rc)
1230                 goto out_security_failure;
1231 
1232         free_secdata(secdata);
1233 
1234         while ((p = strsep(&raw, ",")) != NULL) {
1235                 substring_t args[MAX_OPT_ARGS];
1236                 unsigned long option;
1237                 int token;
1238 
1239                 if (!*p)
1240                         continue;
1241 
1242                 dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);
1243 
1244                 token = match_token(p, nfs_mount_option_tokens, args);
1245                 switch (token) {
1246 
1247                 /*
1248                  * boolean options:  foo/nofoo
1249                  */
1250                 case Opt_soft:
1251                         mnt->flags |= NFS_MOUNT_SOFT;
1252                         break;
1253                 case Opt_hard:
1254                         mnt->flags &= ~NFS_MOUNT_SOFT;
1255                         break;
1256                 case Opt_posix:
1257                         mnt->flags |= NFS_MOUNT_POSIX;
1258                         break;
1259                 case Opt_noposix:
1260                         mnt->flags &= ~NFS_MOUNT_POSIX;
1261                         break;
1262                 case Opt_cto:
1263                         mnt->flags &= ~NFS_MOUNT_NOCTO;
1264                         break;
1265                 case Opt_nocto:
1266                         mnt->flags |= NFS_MOUNT_NOCTO;
1267                         break;
1268                 case Opt_ac:
1269                         mnt->flags &= ~NFS_MOUNT_NOAC;
1270                         break;
1271                 case Opt_noac:
1272                         mnt->flags |= NFS_MOUNT_NOAC;
1273                         break;
1274                 case Opt_lock:
1275                         mnt->flags &= ~NFS_MOUNT_NONLM;
1276                         mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1277                                         NFS_MOUNT_LOCAL_FCNTL);
1278                         break;
1279                 case Opt_nolock:
1280                         mnt->flags |= NFS_MOUNT_NONLM;
1281                         mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1282                                        NFS_MOUNT_LOCAL_FCNTL);
1283                         break;
1284                 case Opt_udp:
1285                         mnt->flags &= ~NFS_MOUNT_TCP;
1286                         mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1287                         break;
1288                 case Opt_tcp:
1289                         mnt->flags |= NFS_MOUNT_TCP;
1290                         mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1291                         break;
1292                 case Opt_rdma:
1293                         mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1294                         mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1295                         xprt_load_transport(p);
1296                         break;
1297                 case Opt_acl:
1298                         mnt->flags &= ~NFS_MOUNT_NOACL;
1299                         break;
1300                 case Opt_noacl:
1301                         mnt->flags |= NFS_MOUNT_NOACL;
1302                         break;
1303                 case Opt_rdirplus:
1304                         mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1305                         break;
1306                 case Opt_nordirplus:
1307                         mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1308                         break;
1309                 case Opt_sharecache:
1310                         mnt->flags &= ~NFS_MOUNT_UNSHARED;
1311                         break;
1312                 case Opt_nosharecache:
1313                         mnt->flags |= NFS_MOUNT_UNSHARED;
1314                         break;
1315                 case Opt_resvport:
1316                         mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1317                         break;
1318                 case Opt_noresvport:
1319                         mnt->flags |= NFS_MOUNT_NORESVPORT;
1320                         break;
1321                 case Opt_fscache:
1322                         mnt->options |= NFS_OPTION_FSCACHE;
1323                         kfree(mnt->fscache_uniq);
1324                         mnt->fscache_uniq = NULL;
1325                         break;
1326                 case Opt_nofscache:
1327                         mnt->options &= ~NFS_OPTION_FSCACHE;
1328                         kfree(mnt->fscache_uniq);
1329                         mnt->fscache_uniq = NULL;
1330                         break;
1331                 case Opt_migration:
1332                         mnt->options |= NFS_OPTION_MIGRATION;
1333                         break;
1334                 case Opt_nomigration:
1335                         mnt->options &= ~NFS_OPTION_MIGRATION;
1336                         break;
1337 
1338                 /*
1339                  * options that take numeric values
1340                  */
1341                 case Opt_port:
1342                         if (nfs_get_option_ul(args, &option) ||
1343                             option > USHRT_MAX)
1344                                 goto out_invalid_value;
1345                         mnt->nfs_server.port = option;
1346                         break;
1347                 case Opt_rsize:
1348                         if (nfs_get_option_ul(args, &option))
1349                                 goto out_invalid_value;
1350                         mnt->rsize = option;
1351                         break;
1352                 case Opt_wsize:
1353                         if (nfs_get_option_ul(args, &option))
1354                                 goto out_invalid_value;
1355                         mnt->wsize = option;
1356                         break;
1357                 case Opt_bsize:
1358                         if (nfs_get_option_ul(args, &option))
1359                                 goto out_invalid_value;
1360                         mnt->bsize = option;
1361                         break;
1362                 case Opt_timeo:
1363                         if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
1364                                 goto out_invalid_value;
1365                         mnt->timeo = option;
1366                         break;
1367                 case Opt_retrans:
1368                         if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
1369                                 goto out_invalid_value;
1370                         mnt->retrans = option;
1371                         break;
1372                 case Opt_acregmin:
1373                         if (nfs_get_option_ul(args, &option))
1374                                 goto out_invalid_value;
1375                         mnt->acregmin = option;
1376                         break;
1377                 case Opt_acregmax:
1378                         if (nfs_get_option_ul(args, &option))
1379                                 goto out_invalid_value;
1380                         mnt->acregmax = option;
1381                         break;
1382                 case Opt_acdirmin:
1383                         if (nfs_get_option_ul(args, &option))
1384                                 goto out_invalid_value;
1385                         mnt->acdirmin = option;
1386                         break;
1387                 case Opt_acdirmax:
1388                         if (nfs_get_option_ul(args, &option))
1389                                 goto out_invalid_value;
1390                         mnt->acdirmax = option;
1391                         break;
1392                 case Opt_actimeo:
1393                         if (nfs_get_option_ul(args, &option))
1394                                 goto out_invalid_value;
1395                         mnt->acregmin = mnt->acregmax =
1396                         mnt->acdirmin = mnt->acdirmax = option;
1397                         break;
1398                 case Opt_namelen:
1399                         if (nfs_get_option_ul(args, &option))
1400                                 goto out_invalid_value;
1401                         mnt->namlen = option;
1402                         break;
1403                 case Opt_mountport:
1404                         if (nfs_get_option_ul(args, &option) ||
1405                             option > USHRT_MAX)
1406                                 goto out_invalid_value;
1407                         mnt->mount_server.port = option;
1408                         break;
1409                 case Opt_mountvers:
1410                         if (nfs_get_option_ul(args, &option) ||
1411                             option < NFS_MNT_VERSION ||
1412                             option > NFS_MNT3_VERSION)
1413                                 goto out_invalid_value;
1414                         mnt->mount_server.version = option;
1415                         break;
1416                 case Opt_minorversion:
1417                         if (nfs_get_option_ul(args, &option))
1418                                 goto out_invalid_value;
1419                         if (option > NFS4_MAX_MINOR_VERSION)
1420                                 goto out_invalid_value;
1421                         mnt->minorversion = option;
1422                         break;
1423 
1424                 /*
1425                  * options that take text values
1426                  */
1427                 case Opt_nfsvers:
1428                         string = match_strdup(args);
1429                         if (string == NULL)
1430                                 goto out_nomem;
1431                         rc = nfs_parse_version_string(string, mnt, args);
1432                         kfree(string);
1433                         if (!rc)
1434                                 goto out_invalid_value;
1435                         break;
1436                 case Opt_sec:
1437                         string = match_strdup(args);
1438                         if (string == NULL)
1439                                 goto out_nomem;
1440                         rc = nfs_parse_security_flavors(string, mnt);
1441                         kfree(string);
1442                         if (!rc) {
1443                                 dfprintk(MOUNT, "NFS:   unrecognized "
1444                                                 "security flavor\n");
1445                                 return 0;
1446                         }
1447                         break;
1448                 case Opt_proto:
1449                         string = match_strdup(args);
1450                         if (string == NULL)
1451                                 goto out_nomem;
1452                         token = match_token(string,
1453                                             nfs_xprt_protocol_tokens, args);
1454 
1455                         protofamily = AF_INET;
1456                         switch (token) {
1457                         case Opt_xprt_udp6:
1458                                 protofamily = AF_INET6;
1459                                 /* fall through */
1460                         case Opt_xprt_udp:
1461                                 mnt->flags &= ~NFS_MOUNT_TCP;
1462                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1463                                 break;
1464                         case Opt_xprt_tcp6:
1465                                 protofamily = AF_INET6;
1466                                 /* fall through */
1467                         case Opt_xprt_tcp:
1468                                 mnt->flags |= NFS_MOUNT_TCP;
1469                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1470                                 break;
1471                         case Opt_xprt_rdma6:
1472                                 protofamily = AF_INET6;
1473                                 /* fall through */
1474                         case Opt_xprt_rdma:
1475                                 /* vector side protocols to TCP */
1476                                 mnt->flags |= NFS_MOUNT_TCP;
1477                                 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1478                                 xprt_load_transport(string);
1479                                 break;
1480                         default:
1481                                 dfprintk(MOUNT, "NFS:   unrecognized "
1482                                                 "transport protocol\n");
1483                                 kfree(string);
1484                                 return 0;
1485                         }
1486                         kfree(string);
1487                         break;
1488                 case Opt_mountproto:
1489                         string = match_strdup(args);
1490                         if (string == NULL)
1491                                 goto out_nomem;
1492                         token = match_token(string,
1493                                             nfs_xprt_protocol_tokens, args);
1494                         kfree(string);
1495 
1496                         mountfamily = AF_INET;
1497                         switch (token) {
1498                         case Opt_xprt_udp6:
1499                                 mountfamily = AF_INET6;
1500                                 /* fall through */
1501                         case Opt_xprt_udp:
1502                                 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1503                                 break;
1504                         case Opt_xprt_tcp6:
1505                                 mountfamily = AF_INET6;
1506                                 /* fall through */
1507                         case Opt_xprt_tcp:
1508                                 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1509                                 break;
1510                         case Opt_xprt_rdma: /* not used for side protocols */
1511                         default:
1512                                 dfprintk(MOUNT, "NFS:   unrecognized "
1513                                                 "transport protocol\n");
1514                                 return 0;
1515                         }
1516                         break;
1517                 case Opt_addr:
1518                         string = match_strdup(args);
1519                         if (string == NULL)
1520                                 goto out_nomem;
1521                         mnt->nfs_server.addrlen =
1522                                 rpc_pton(mnt->net, string, strlen(string),
1523                                         (struct sockaddr *)
1524                                         &mnt->nfs_server.address,
1525                                         sizeof(mnt->nfs_server.address));
1526                         kfree(string);
1527                         if (mnt->nfs_server.addrlen == 0)
1528                                 goto out_invalid_address;
1529                         break;
1530                 case Opt_clientaddr:
1531                         if (nfs_get_option_str(args, &mnt->client_address))
1532                                 goto out_nomem;
1533                         break;
1534                 case Opt_mounthost:
1535                         if (nfs_get_option_str(args,
1536                                                &mnt->mount_server.hostname))
1537                                 goto out_nomem;
1538                         break;
1539                 case Opt_mountaddr:
1540                         string = match_strdup(args);
1541                         if (string == NULL)
1542                                 goto out_nomem;
1543                         mnt->mount_server.addrlen =
1544                                 rpc_pton(mnt->net, string, strlen(string),
1545                                         (struct sockaddr *)
1546                                         &mnt->mount_server.address,
1547                                         sizeof(mnt->mount_server.address));
1548                         kfree(string);
1549                         if (mnt->mount_server.addrlen == 0)
1550                                 goto out_invalid_address;
1551                         break;
1552                 case Opt_lookupcache:
1553                         string = match_strdup(args);
1554                         if (string == NULL)
1555                                 goto out_nomem;
1556                         token = match_token(string,
1557                                         nfs_lookupcache_tokens, args);
1558                         kfree(string);
1559                         switch (token) {
1560                                 case Opt_lookupcache_all:
1561                                         mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1562                                         break;
1563                                 case Opt_lookupcache_positive:
1564                                         mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1565                                         mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1566                                         break;
1567                                 case Opt_lookupcache_none:
1568                                         mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1569                                         break;
1570                                 default:
1571                                         dfprintk(MOUNT, "NFS:   invalid "
1572                                                         "lookupcache argument\n");
1573                                         return 0;
1574                         };
1575                         break;
1576                 case Opt_fscache_uniq:
1577                         if (nfs_get_option_str(args, &mnt->fscache_uniq))
1578                                 goto out_nomem;
1579                         mnt->options |= NFS_OPTION_FSCACHE;
1580                         break;
1581                 case Opt_local_lock:
1582                         string = match_strdup(args);
1583                         if (string == NULL)
1584                                 goto out_nomem;
1585                         token = match_token(string, nfs_local_lock_tokens,
1586                                         args);
1587                         kfree(string);
1588                         switch (token) {
1589                         case Opt_local_lock_all:
1590                                 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1591                                                NFS_MOUNT_LOCAL_FCNTL);
1592                                 break;
1593                         case Opt_local_lock_flock:
1594                                 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1595                                 break;
1596                         case Opt_local_lock_posix:
1597                                 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1598                                 break;
1599                         case Opt_local_lock_none:
1600                                 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1601                                                 NFS_MOUNT_LOCAL_FCNTL);
1602                                 break;
1603                         default:
1604                                 dfprintk(MOUNT, "NFS:   invalid "
1605                                                 "local_lock argument\n");
1606                                 return 0;
1607                         };
1608                         break;
1609 
1610                 /*
1611                  * Special options
1612                  */
1613                 case Opt_sloppy:
1614                         sloppy = 1;
1615                         dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
1616                         break;
1617                 case Opt_userspace:
1618                 case Opt_deprecated:
1619                         dfprintk(MOUNT, "NFS:   ignoring mount option "
1620                                         "'%s'\n", p);
1621                         break;
1622 
1623                 default:
1624                         invalid_option = 1;
1625                         dfprintk(MOUNT, "NFS:   unrecognized mount option "
1626                                         "'%s'\n", p);
1627                 }
1628         }
1629 
1630         if (!sloppy && invalid_option)
1631                 return 0;
1632 
1633         if (mnt->minorversion && mnt->version != 4)
1634                 goto out_minorversion_mismatch;
1635 
1636         if (mnt->options & NFS_OPTION_MIGRATION &&
1637             (mnt->version != 4 || mnt->minorversion != 0))
1638                 goto out_migration_misuse;
1639 
1640         /*
1641          * verify that any proto=/mountproto= options match the address
1642          * families in the addr=/mountaddr= options.
1643          */
1644         if (protofamily != AF_UNSPEC &&
1645             protofamily != mnt->nfs_server.address.ss_family)
1646                 goto out_proto_mismatch;
1647 
1648         if (mountfamily != AF_UNSPEC) {
1649                 if (mnt->mount_server.addrlen) {
1650                         if (mountfamily != mnt->mount_server.address.ss_family)
1651                                 goto out_mountproto_mismatch;
1652                 } else {
1653                         if (mountfamily != mnt->nfs_server.address.ss_family)
1654                                 goto out_mountproto_mismatch;
1655                 }
1656         }
1657 
1658         return 1;
1659 
1660 out_mountproto_mismatch:
1661         printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1662                          "option\n");
1663         return 0;
1664 out_proto_mismatch:
1665         printk(KERN_INFO "NFS: server address does not match proto= option\n");
1666         return 0;
1667 out_invalid_address:
1668         printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1669         return 0;
1670 out_invalid_value:
1671         printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1672         return 0;
1673 out_minorversion_mismatch:
1674         printk(KERN_INFO "NFS: mount option vers=%u does not support "
1675                          "minorversion=%u\n", mnt->version, mnt->minorversion);
1676         return 0;
1677 out_migration_misuse:
1678         printk(KERN_INFO
1679                 "NFS: 'migration' not supported for this NFS version\n");
1680         return 0;
1681 out_nomem:
1682         printk(KERN_INFO "NFS: not enough memory to parse option\n");
1683         return 0;
1684 out_security_failure:
1685         free_secdata(secdata);
1686         printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1687         return 0;
1688 }
1689 
1690 /*
1691  * Ensure that a specified authtype in args->auth_info is supported by
1692  * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1693  * -EACCES if not.
1694  */
1695 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1696                         rpc_authflavor_t *server_authlist, unsigned int count)
1697 {
1698         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1699         bool found_auth_null = false;
1700         unsigned int i;
1701 
1702         /*
1703          * If the sec= mount option is used, the specified flavor or AUTH_NULL
1704          * must be in the list returned by the server.
1705          *
1706          * AUTH_NULL has a special meaning when it's in the server list - it
1707          * means that the server will ignore the rpc creds, so any flavor
1708          * can be used but still use the sec= that was specified.
1709          *
1710          * Note also that the MNT procedure in MNTv1 does not return a list
1711          * of supported security flavors. In this case, nfs_mount() fabricates
1712          * a security flavor list containing just AUTH_NULL.
1713          */
1714         for (i = 0; i < count; i++) {
1715                 flavor = server_authlist[i];
1716 
1717                 if (nfs_auth_info_match(&args->auth_info, flavor))
1718                         goto out;
1719 
1720                 if (flavor == RPC_AUTH_NULL)
1721                         found_auth_null = true;
1722         }
1723 
1724         if (found_auth_null) {
1725                 flavor = args->auth_info.flavors[0];
1726                 goto out;
1727         }
1728 
1729         dfprintk(MOUNT,
1730                  "NFS: specified auth flavors not supported by server\n");
1731         return -EACCES;
1732 
1733 out:
1734         args->selected_flavor = flavor;
1735         dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1736         return 0;
1737 }
1738 
1739 /*
1740  * Use the remote server's MOUNT service to request the NFS file handle
1741  * corresponding to the provided path.
1742  */
1743 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1744                              struct nfs_fh *root_fh,
1745                              rpc_authflavor_t *server_authlist,
1746                              unsigned int *server_authlist_len)
1747 {
1748         struct nfs_mount_request request = {
1749                 .sap            = (struct sockaddr *)
1750                                                 &args->mount_server.address,
1751                 .dirpath        = args->nfs_server.export_path,
1752                 .protocol       = args->mount_server.protocol,
1753                 .fh             = root_fh,
1754                 .noresvport     = args->flags & NFS_MOUNT_NORESVPORT,
1755                 .auth_flav_len  = server_authlist_len,
1756                 .auth_flavs     = server_authlist,
1757                 .net            = args->net,
1758         };
1759         int status;
1760 
1761         if (args->mount_server.version == 0) {
1762                 switch (args->version) {
1763                         default:
1764                                 args->mount_server.version = NFS_MNT3_VERSION;
1765                                 break;
1766                         case 2:
1767                                 args->mount_server.version = NFS_MNT_VERSION;
1768                 }
1769         }
1770         request.version = args->mount_server.version;
1771 
1772         if (args->mount_server.hostname)
1773                 request.hostname = args->mount_server.hostname;
1774         else
1775                 request.hostname = args->nfs_server.hostname;
1776 
1777         /*
1778          * Construct the mount server's address.
1779          */
1780         if (args->mount_server.address.ss_family == AF_UNSPEC) {
1781                 memcpy(request.sap, &args->nfs_server.address,
1782                        args->nfs_server.addrlen);
1783                 args->mount_server.addrlen = args->nfs_server.addrlen;
1784         }
1785         request.salen = args->mount_server.addrlen;
1786         nfs_set_port(request.sap, &args->mount_server.port, 0);
1787 
1788         /*
1789          * Now ask the mount server to map our export path
1790          * to a file handle.
1791          */
1792         status = nfs_mount(&request);
1793         if (status != 0) {
1794                 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1795                                 request.hostname, status);
1796                 return status;
1797         }
1798 
1799         return 0;
1800 }
1801 
1802 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1803                                         struct nfs_subversion *nfs_mod)
1804 {
1805         int status;
1806         unsigned int i;
1807         bool tried_auth_unix = false;
1808         bool auth_null_in_list = false;
1809         struct nfs_server *server = ERR_PTR(-EACCES);
1810         struct nfs_parsed_mount_data *args = mount_info->parsed;
1811         rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1812         unsigned int authlist_len = ARRAY_SIZE(authlist);
1813 
1814         status = nfs_request_mount(args, mount_info->mntfh, authlist,
1815                                         &authlist_len);
1816         if (status)
1817                 return ERR_PTR(status);
1818 
1819         /*
1820          * Was a sec= authflavor specified in the options? First, verify
1821          * whether the server supports it, and then just try to use it if so.
1822          */
1823         if (args->auth_info.flavor_len > 0) {
1824                 status = nfs_verify_authflavors(args, authlist, authlist_len);
1825                 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1826                          args->selected_flavor);
1827                 if (status)
1828                         return ERR_PTR(status);
1829                 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1830         }
1831 
1832         /*
1833          * No sec= option was provided. RFC 2623, section 2.7 suggests we
1834          * SHOULD prefer the flavor listed first. However, some servers list
1835          * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1836          */
1837         for (i = 0; i < authlist_len; ++i) {
1838                 rpc_authflavor_t flavor;
1839                 struct rpcsec_gss_info info;
1840 
1841                 flavor = authlist[i];
1842                 switch (flavor) {
1843                 case RPC_AUTH_UNIX:
1844                         tried_auth_unix = true;
1845                         break;
1846                 case RPC_AUTH_NULL:
1847                         auth_null_in_list = true;
1848                         continue;
1849                 default:
1850                         if (rpcauth_get_gssinfo(flavor, &info) != 0)
1851                                 continue;
1852                         /* Fallthrough */
1853                 }
1854                 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1855                 args->selected_flavor = flavor;
1856                 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1857                 if (!IS_ERR(server))
1858                         return server;
1859         }
1860 
1861         /*
1862          * Nothing we tried so far worked. At this point, give up if we've
1863          * already tried AUTH_UNIX or if the server's list doesn't contain
1864          * AUTH_NULL
1865          */
1866         if (tried_auth_unix || !auth_null_in_list)
1867                 return server;
1868 
1869         /* Last chance! Try AUTH_UNIX */
1870         dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1871         args->selected_flavor = RPC_AUTH_UNIX;
1872         return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1873 }
1874 
1875 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1876                              struct nfs_mount_info *mount_info,
1877                              struct nfs_subversion *nfs_mod)
1878 {
1879         struct nfs_server *server;
1880 
1881         if (mount_info->parsed->need_mount)
1882                 server = nfs_try_mount_request(mount_info, nfs_mod);
1883         else
1884                 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1885 
1886         if (IS_ERR(server))
1887                 return ERR_CAST(server);
1888 
1889         return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1890 }
1891 EXPORT_SYMBOL_GPL(nfs_try_mount);
1892 
1893 /*
1894  * Split "dev_name" into "hostname:export_path".
1895  *
1896  * The leftmost colon demarks the split between the server's hostname
1897  * and the export path.  If the hostname starts with a left square
1898  * bracket, then it may contain colons.
1899  *
1900  * Note: caller frees hostname and export path, even on error.
1901  */
1902 static int nfs_parse_devname(const char *dev_name,
1903                              char **hostname, size_t maxnamlen,
1904                              char **export_path, size_t maxpathlen)
1905 {
1906         size_t len;
1907         char *end;
1908 
1909         /* Is the host name protected with square brakcets? */
1910         if (*dev_name == '[') {
1911                 end = strchr(++dev_name, ']');
1912                 if (end == NULL || end[1] != ':')
1913                         goto out_bad_devname;
1914 
1915                 len = end - dev_name;
1916                 end++;
1917         } else {
1918                 char *comma;
1919 
1920                 end = strchr(dev_name, ':');
1921                 if (end == NULL)
1922                         goto out_bad_devname;
1923                 len = end - dev_name;
1924 
1925                 /* kill possible hostname list: not supported */
1926                 comma = strchr(dev_name, ',');
1927                 if (comma != NULL && comma < end)
1928                         *comma = 0;
1929         }
1930 
1931         if (len > maxnamlen)
1932                 goto out_hostname;
1933 
1934         /* N.B. caller will free nfs_server.hostname in all cases */
1935         *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1936         if (*hostname == NULL)
1937                 goto out_nomem;
1938         len = strlen(++end);
1939         if (len > maxpathlen)
1940                 goto out_path;
1941         *export_path = kstrndup(end, len, GFP_KERNEL);
1942         if (!*export_path)
1943                 goto out_nomem;
1944 
1945         dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1946         return 0;
1947 
1948 out_bad_devname:
1949         dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1950         return -EINVAL;
1951 
1952 out_nomem:
1953         dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1954         return -ENOMEM;
1955 
1956 out_hostname:
1957         dfprintk(MOUNT, "NFS: server hostname too long\n");
1958         return -ENAMETOOLONG;
1959 
1960 out_path:
1961         dfprintk(MOUNT, "NFS: export pathname too long\n");
1962         return -ENAMETOOLONG;
1963 }
1964 
1965 /*
1966  * Validate the NFS2/NFS3 mount data
1967  * - fills in the mount root filehandle
1968  *
1969  * For option strings, user space handles the following behaviors:
1970  *
1971  * + DNS: mapping server host name to IP address ("addr=" option)
1972  *
1973  * + failure mode: how to behave if a mount request can't be handled
1974  *   immediately ("fg/bg" option)
1975  *
1976  * + retry: how often to retry a mount request ("retry=" option)
1977  *
1978  * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1979  *   mountproto=tcp after mountproto=udp, and so on
1980  */
1981 static int nfs23_validate_mount_data(void *options,
1982                                      struct nfs_parsed_mount_data *args,
1983                                      struct nfs_fh *mntfh,
1984                                      const char *dev_name)
1985 {
1986         struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1987         struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1988         int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1989 
1990         if (data == NULL)
1991                 goto out_no_data;
1992 
1993         args->version = NFS_DEFAULT_VERSION;
1994         switch (data->version) {
1995         case 1:
1996                 data->namlen = 0; /* fall through */
1997         case 2:
1998                 data->bsize = 0; /* fall through */
1999         case 3:
2000                 if (data->flags & NFS_MOUNT_VER3)
2001                         goto out_no_v3;
2002                 data->root.size = NFS2_FHSIZE;
2003                 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
2004                 /* Turn off security negotiation */
2005                 extra_flags |= NFS_MOUNT_SECFLAVOUR;
2006                 /* fall through */
2007         case 4:
2008                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2009                         goto out_no_sec;
2010                 /* fall through */
2011         case 5:
2012                 memset(data->context, 0, sizeof(data->context));
2013                 /* fall through */
2014         case 6:
2015                 if (data->flags & NFS_MOUNT_VER3) {
2016                         if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
2017                                 goto out_invalid_fh;
2018                         mntfh->size = data->root.size;
2019                         args->version = 3;
2020                 } else {
2021                         mntfh->size = NFS2_FHSIZE;
2022                         args->version = 2;
2023                 }
2024 
2025 
2026                 memcpy(mntfh->data, data->root.data, mntfh->size);
2027                 if (mntfh->size < sizeof(mntfh->data))
2028                         memset(mntfh->data + mntfh->size, 0,
2029                                sizeof(mntfh->data) - mntfh->size);
2030 
2031                 /*
2032                  * Translate to nfs_parsed_mount_data, which nfs_fill_super
2033                  * can deal with.
2034                  */
2035                 args->flags             = data->flags & NFS_MOUNT_FLAGMASK;
2036                 args->flags             |= extra_flags;
2037                 args->rsize             = data->rsize;
2038                 args->wsize             = data->wsize;
2039                 args->timeo             = data->timeo;
2040                 args->retrans           = data->retrans;
2041                 args->acregmin          = data->acregmin;
2042                 args->acregmax          = data->acregmax;
2043                 args->acdirmin          = data->acdirmin;
2044                 args->acdirmax          = data->acdirmax;
2045                 args->need_mount        = false;
2046 
2047                 memcpy(sap, &data->addr, sizeof(data->addr));
2048                 args->nfs_server.addrlen = sizeof(data->addr);
2049                 args->nfs_server.port = ntohs(data->addr.sin_port);
2050                 if (!nfs_verify_server_address(sap))
2051                         goto out_no_address;
2052 
2053                 if (!(data->flags & NFS_MOUNT_TCP))
2054                         args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2055                 /* N.B. caller will free nfs_server.hostname in all cases */
2056                 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2057                 args->namlen            = data->namlen;
2058                 args->bsize             = data->bsize;
2059 
2060                 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2061                         args->selected_flavor = data->pseudoflavor;
2062                 else
2063                         args->selected_flavor = RPC_AUTH_UNIX;
2064                 if (!args->nfs_server.hostname)
2065                         goto out_nomem;
2066 
2067                 if (!(data->flags & NFS_MOUNT_NONLM))
2068                         args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2069                                          NFS_MOUNT_LOCAL_FCNTL);
2070                 else
2071                         args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2072                                         NFS_MOUNT_LOCAL_FCNTL);
2073                 /*
2074                  * The legacy version 6 binary mount data from userspace has a
2075                  * field used only to transport selinux information into the
2076                  * the kernel.  To continue to support that functionality we
2077                  * have a touch of selinux knowledge here in the NFS code. The
2078                  * userspace code converted context=blah to just blah so we are
2079                  * converting back to the full string selinux understands.
2080                  */
2081                 if (data->context[0]){
2082 #ifdef CONFIG_SECURITY_SELINUX
2083                         int rc;
2084                         char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2085                         if (!opts_str)
2086                                 return -ENOMEM;
2087                         strcpy(opts_str, "context=");
2088                         data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2089                         strcat(opts_str, &data->context[0]);
2090                         rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2091                         kfree(opts_str);
2092                         if (rc)
2093                                 return rc;
2094 #else
2095                         return -EINVAL;
2096 #endif
2097                 }
2098 
2099                 break;
2100         default:
2101                 return NFS_TEXT_DATA;
2102         }
2103 
2104         return 0;
2105 
2106 out_no_data:
2107         dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2108         return -EINVAL;
2109 
2110 out_no_v3:
2111         dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2112                  data->version);
2113         return -EINVAL;
2114 
2115 out_no_sec:
2116         dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2117         return -EINVAL;
2118 
2119 out_nomem:
2120         dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2121         return -ENOMEM;
2122 
2123 out_no_address:
2124         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2125         return -EINVAL;
2126 
2127 out_invalid_fh:
2128         dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2129         return -EINVAL;
2130 }
2131 
2132 #if IS_ENABLED(CONFIG_NFS_V4)
2133 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2134                                    void *options,
2135                                    struct nfs_parsed_mount_data *args,
2136                                    struct nfs_fh *mntfh,
2137                                    const char *dev_name)
2138 {
2139         if (fs_type == &nfs_fs_type)
2140                 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2141         return nfs4_validate_mount_data(options, args, dev_name);
2142 }
2143 #else
2144 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2145                                    void *options,
2146                                    struct nfs_parsed_mount_data *args,
2147                                    struct nfs_fh *mntfh,
2148                                    const char *dev_name)
2149 {
2150         return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2151 }
2152 #endif
2153 
2154 static int nfs_validate_text_mount_data(void *options,
2155                                         struct nfs_parsed_mount_data *args,
2156                                         const char *dev_name)
2157 {
2158         int port = 0;
2159         int max_namelen = PAGE_SIZE;
2160         int max_pathlen = NFS_MAXPATHLEN;
2161         struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2162 
2163         if (nfs_parse_mount_options((char *)options, args) == 0)
2164                 return -EINVAL;
2165 
2166         if (!nfs_verify_server_address(sap))
2167                 goto out_no_address;
2168 
2169         if (args->version == 4) {
2170 #if IS_ENABLED(CONFIG_NFS_V4)
2171                 port = NFS_PORT;
2172                 max_namelen = NFS4_MAXNAMLEN;
2173                 max_pathlen = NFS4_MAXPATHLEN;
2174                 nfs_validate_transport_protocol(args);
2175                 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2176                         goto out_invalid_transport_udp;
2177                 nfs4_validate_mount_flags(args);
2178 #else
2179                 goto out_v4_not_compiled;
2180 #endif /* CONFIG_NFS_V4 */
2181         } else
2182                 nfs_set_mount_transport_protocol(args);
2183 
2184         nfs_set_port(sap, &args->nfs_server.port, port);
2185 
2186         return nfs_parse_devname(dev_name,
2187                                    &args->nfs_server.hostname,
2188                                    max_namelen,
2189                                    &args->nfs_server.export_path,
2190                                    max_pathlen);
2191 
2192 #if !IS_ENABLED(CONFIG_NFS_V4)
2193 out_v4_not_compiled:
2194         dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2195         return -EPROTONOSUPPORT;
2196 #else
2197 out_invalid_transport_udp:
2198         dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2199         return -EINVAL;
2200 #endif /* !CONFIG_NFS_V4 */
2201 
2202 out_no_address:
2203         dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2204         return -EINVAL;
2205 }
2206 
2207 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2208                 | NFS_MOUNT_SECURE \
2209                 | NFS_MOUNT_TCP \
2210                 | NFS_MOUNT_VER3 \
2211                 | NFS_MOUNT_KERBEROS \
2212                 | NFS_MOUNT_NONLM \
2213                 | NFS_MOUNT_BROKEN_SUID \
2214                 | NFS_MOUNT_STRICTLOCK \
2215                 | NFS_MOUNT_LEGACY_INTERFACE)
2216 
2217 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2218                 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2219 
2220 static int
2221 nfs_compare_remount_data(struct nfs_server *nfss,
2222                          struct nfs_parsed_mount_data *data)
2223 {
2224         if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2225             data->rsize != nfss->rsize ||
2226             data->wsize != nfss->wsize ||
2227             data->version != nfss->nfs_client->rpc_ops->version ||
2228             data->minorversion != nfss->nfs_client->cl_minorversion ||
2229             data->retrans != nfss->client->cl_timeout->to_retries ||
2230             !nfs_auth_info_match(&data->auth_info, nfss->client->cl_auth->au_flavor) ||
2231             data->acregmin != nfss->acregmin / HZ ||
2232             data->acregmax != nfss->acregmax / HZ ||
2233             data->acdirmin != nfss->acdirmin / HZ ||
2234             data->acdirmax != nfss->acdirmax / HZ ||
2235             data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2236             data->nfs_server.port != nfss->port ||
2237             data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2238             !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2239                           (struct sockaddr *)&nfss->nfs_client->cl_addr))
2240                 return -EINVAL;
2241 
2242         return 0;
2243 }
2244 
2245 int
2246 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2247 {
2248         int error;
2249         struct nfs_server *nfss = sb->s_fs_info;
2250         struct nfs_parsed_mount_data *data;
2251         struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2252         struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2253         u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2254 
2255         sync_filesystem(sb);
2256 
2257         /*
2258          * Userspace mount programs that send binary options generally send
2259          * them populated with default values. We have no way to know which
2260          * ones were explicitly specified. Fall back to legacy behavior and
2261          * just return success.
2262          */
2263         if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2264             (nfsvers <= 3 && (!options || (options->version >= 1 &&
2265                                            options->version <= 6))))
2266                 return 0;
2267 
2268         data = kzalloc(sizeof(*data), GFP_KERNEL);
2269         if (data == NULL)
2270                 return -ENOMEM;
2271 
2272         /* fill out struct with values from existing mount */
2273         data->flags = nfss->flags;
2274         data->rsize = nfss->rsize;
2275         data->wsize = nfss->wsize;
2276         data->retrans = nfss->client->cl_timeout->to_retries;
2277         data->selected_flavor = nfss->client->cl_auth->au_flavor;
2278         data->acregmin = nfss->acregmin / HZ;
2279         data->acregmax = nfss->acregmax / HZ;
2280         data->acdirmin = nfss->acdirmin / HZ;
2281         data->acdirmax = nfss->acdirmax / HZ;
2282         data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2283         data->nfs_server.port = nfss->port;
2284         data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2285         data->version = nfsvers;
2286         data->minorversion = nfss->nfs_client->cl_minorversion;
2287         data->net = current->nsproxy->net_ns;
2288         memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2289                 data->nfs_server.addrlen);
2290 
2291         /* overwrite those values with any that were specified */
2292         error = -EINVAL;
2293         if (!nfs_parse_mount_options((char *)options, data))
2294                 goto out;
2295 
2296         /*
2297          * noac is a special case. It implies -o sync, but that's not
2298          * necessarily reflected in the mtab options. do_remount_sb
2299          * will clear SB_SYNCHRONOUS if -o sync wasn't specified in the
2300          * remount options, so we have to explicitly reset it.
2301          */
2302         if (data->flags & NFS_MOUNT_NOAC)
2303                 *flags |= SB_SYNCHRONOUS;
2304 
2305         /* compare new mount options with old ones */
2306         error = nfs_compare_remount_data(nfss, data);
2307 out:
2308         kfree(data);
2309         return error;
2310 }
2311 EXPORT_SYMBOL_GPL(nfs_remount);
2312 
2313 /*
2314  * Initialise the common bits of the superblock
2315  */
2316 static void nfs_initialise_sb(struct super_block *sb)
2317 {
2318         struct nfs_server *server = NFS_SB(sb);
2319 
2320         sb->s_magic = NFS_SUPER_MAGIC;
2321 
2322         /* We probably want something more informative here */
2323         snprintf(sb->s_id, sizeof(sb->s_id),
2324                  "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2325 
2326         if (sb->s_blocksize == 0)
2327                 sb->s_blocksize = nfs_block_bits(server->wsize,
2328                                                  &sb->s_blocksize_bits);
2329 
2330         nfs_super_set_maxbytes(sb, server->maxfilesize);
2331 }
2332 
2333 /*
2334  * Finish setting up an NFS2/3 superblock
2335  */
2336 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2337 {
2338         struct nfs_parsed_mount_data *data = mount_info->parsed;
2339         struct nfs_server *server = NFS_SB(sb);
2340 
2341         sb->s_blocksize_bits = 0;
2342         sb->s_blocksize = 0;
2343         sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2344         sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2345         if (data && data->bsize)
2346                 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2347 
2348         if (server->nfs_client->rpc_ops->version != 2) {
2349                 /* The VFS shouldn't apply the umask to mode bits. We will do
2350                  * so ourselves when necessary.
2351                  */
2352                 sb->s_flags |= SB_POSIXACL;
2353                 sb->s_time_gran = 1;
2354                 sb->s_export_op = &nfs_export_ops;
2355         }
2356 
2357         nfs_initialise_sb(sb);
2358 }
2359 EXPORT_SYMBOL_GPL(nfs_fill_super);
2360 
2361 /*
2362  * Finish setting up a cloned NFS2/3/4 superblock
2363  */
2364 static void nfs_clone_super(struct super_block *sb,
2365                             struct nfs_mount_info *mount_info)
2366 {
2367         const struct super_block *old_sb = mount_info->cloned->sb;
2368         struct nfs_server *server = NFS_SB(sb);
2369 
2370         sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2371         sb->s_blocksize = old_sb->s_blocksize;
2372         sb->s_maxbytes = old_sb->s_maxbytes;
2373         sb->s_xattr = old_sb->s_xattr;
2374         sb->s_op = old_sb->s_op;
2375         sb->s_time_gran = 1;
2376         sb->s_export_op = old_sb->s_export_op;
2377 
2378         if (server->nfs_client->rpc_ops->version != 2) {
2379                 /* The VFS shouldn't apply the umask to mode bits. We will do
2380                  * so ourselves when necessary.
2381                  */
2382                 sb->s_flags |= SB_POSIXACL;
2383         }
2384 
2385         nfs_initialise_sb(sb);
2386 }
2387 
2388 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2389 {
2390         const struct nfs_server *a = s->s_fs_info;
2391         const struct rpc_clnt *clnt_a = a->client;
2392         const struct rpc_clnt *clnt_b = b->client;
2393 
2394         if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2395                 goto Ebusy;
2396         if (a->nfs_client != b->nfs_client)
2397                 goto Ebusy;
2398         if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2399                 goto Ebusy;
2400         if (a->wsize != b->wsize)
2401                 goto Ebusy;
2402         if (a->rsize != b->rsize)
2403                 goto Ebusy;
2404         if (a->acregmin != b->acregmin)
2405                 goto Ebusy;
2406         if (a->acregmax != b->acregmax)
2407                 goto Ebusy;
2408         if (a->acdirmin != b->acdirmin)
2409                 goto Ebusy;
2410         if (a->acdirmax != b->acdirmax)
2411                 goto Ebusy;
2412         if (b->auth_info.flavor_len > 0 &&
2413            clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2414                 goto Ebusy;
2415         return 1;
2416 Ebusy:
2417         return 0;
2418 }
2419 
2420 struct nfs_sb_mountdata {
2421         struct nfs_server *server;
2422         int mntflags;
2423 };
2424 
2425 static int nfs_set_super(struct super_block *s, void *data)
2426 {
2427         struct nfs_sb_mountdata *sb_mntdata = data;
2428         struct nfs_server *server = sb_mntdata->server;
2429         int ret;
2430 
2431         s->s_flags = sb_mntdata->mntflags;
2432         s->s_fs_info = server;
2433         s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2434         ret = set_anon_super(s, server);
2435         if (ret == 0)
2436                 server->s_dev = s->s_dev;
2437         return ret;
2438 }
2439 
2440 static int nfs_compare_super_address(struct nfs_server *server1,
2441                                      struct nfs_server *server2)
2442 {
2443         struct sockaddr *sap1, *sap2;
2444         struct rpc_xprt *xprt1 = server1->client->cl_xprt;
2445         struct rpc_xprt *xprt2 = server2->client->cl_xprt;
2446 
2447         if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
2448                 return 0;
2449 
2450         sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2451         sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2452 
2453         if (sap1->sa_family != sap2->sa_family)
2454                 return 0;
2455 
2456         switch (sap1->sa_family) {
2457         case AF_INET: {
2458                 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2459                 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2460                 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2461                         return 0;
2462                 if (sin1->sin_port != sin2->sin_port)
2463                         return 0;
2464                 break;
2465         }
2466         case AF_INET6: {
2467                 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2468                 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2469                 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2470                         return 0;
2471                 if (sin1->sin6_port != sin2->sin6_port)
2472                         return 0;
2473                 break;
2474         }
2475         default:
2476                 return 0;
2477         }
2478 
2479         return 1;
2480 }
2481 
2482 static int nfs_compare_super(struct super_block *sb, void *data)
2483 {
2484         struct nfs_sb_mountdata *sb_mntdata = data;
2485         struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2486         int mntflags = sb_mntdata->mntflags;
2487 
2488         if (!nfs_compare_super_address(old, server))
2489                 return 0;
2490         /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2491         if (old->flags & NFS_MOUNT_UNSHARED)
2492                 return 0;
2493         if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2494                 return 0;
2495         return nfs_compare_mount_options(sb, server, mntflags);
2496 }
2497 
2498 #ifdef CONFIG_NFS_FSCACHE
2499 static void nfs_get_cache_cookie(struct super_block *sb,
2500                                  struct nfs_parsed_mount_data *parsed,
2501                                  struct nfs_clone_mount *cloned)
2502 {
2503         struct nfs_server *nfss = NFS_SB(sb);
2504         char *uniq = NULL;
2505         int ulen = 0;
2506 
2507         nfss->fscache_key = NULL;
2508         nfss->fscache = NULL;
2509 
2510         if (parsed) {
2511                 if (!(parsed->options & NFS_OPTION_FSCACHE))
2512                         return;
2513                 if (parsed->fscache_uniq) {
2514                         uniq = parsed->fscache_uniq;
2515                         ulen = strlen(parsed->fscache_uniq);
2516                 }
2517         } else if (cloned) {
2518                 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2519                 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2520                         return;
2521                 if (mnt_s->fscache_key) {
2522                         uniq = mnt_s->fscache_key->key.uniquifier;
2523                         ulen = mnt_s->fscache_key->key.uniq_len;
2524                 };
2525         } else
2526                 return;
2527 
2528         nfs_fscache_get_super_cookie(sb, uniq, ulen);
2529 }
2530 #else
2531 static void nfs_get_cache_cookie(struct super_block *sb,
2532                                  struct nfs_parsed_mount_data *parsed,
2533                                  struct nfs_clone_mount *cloned)
2534 {
2535 }
2536 #endif
2537 
2538 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2539                         struct nfs_mount_info *mount_info)
2540 {
2541         int error;
2542         unsigned long kflags = 0, kflags_out = 0;
2543         if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2544                 kflags |= SECURITY_LSM_NATIVE_LABELS;
2545 
2546         error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2547                                                 kflags, &kflags_out);
2548         if (error)
2549                 goto err;
2550 
2551         if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2552                 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2553                 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2554 err:
2555         return error;
2556 }
2557 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2558 
2559 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2560                           struct nfs_mount_info *mount_info)
2561 {
2562         int error;
2563         unsigned long kflags = 0, kflags_out = 0;
2564 
2565         /* clone any lsm security options from the parent to the new sb */
2566         if (d_inode(mntroot)->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2567                 return -ESTALE;
2568 
2569         if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2570                 kflags |= SECURITY_LSM_NATIVE_LABELS;
2571 
2572         error = security_sb_clone_mnt_opts(mount_info->cloned->sb, s, kflags,
2573                         &kflags_out);
2574         if (error)
2575                 return error;
2576 
2577         if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2578                 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2579                 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2580         return 0;
2581 }
2582 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2583 
2584 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2585                                    int flags, const char *dev_name,
2586                                    struct nfs_mount_info *mount_info,
2587                                    struct nfs_subversion *nfs_mod)
2588 {
2589         struct super_block *s;
2590         struct dentry *mntroot = ERR_PTR(-ENOMEM);
2591         int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2592         struct nfs_sb_mountdata sb_mntdata = {
2593                 .mntflags = flags,
2594                 .server = server,
2595         };
2596         int error;
2597 
2598         if (server->flags & NFS_MOUNT_UNSHARED)
2599                 compare_super = NULL;
2600 
2601         /* -o noac implies -o sync */
2602         if (server->flags & NFS_MOUNT_NOAC)
2603                 sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2604 
2605         if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2606                 if (mount_info->cloned->sb->s_flags & SB_SYNCHRONOUS)
2607                         sb_mntdata.mntflags |= SB_SYNCHRONOUS;
2608 
2609         /* Get a superblock - note that we may end up sharing one that already exists */
2610         s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2611         if (IS_ERR(s)) {
2612                 mntroot = ERR_CAST(s);
2613                 goto out_err_nosb;
2614         }
2615 
2616         if (s->s_fs_info != server) {
2617                 nfs_free_server(server);
2618                 server = NULL;
2619         } else {
2620                 error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev),
2621                                              MINOR(server->s_dev));
2622                 if (error) {
2623                         mntroot = ERR_PTR(error);
2624                         goto error_splat_super;
2625                 }
2626                 s->s_bdi->ra_pages = server->rpages * NFS_MAX_READAHEAD;
2627                 server->super = s;
2628         }
2629 
2630         if (!s->s_root) {
2631                 /* initial superblock/root creation */
2632                 mount_info->fill_super(s, mount_info);
2633                 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2634                 if (!(server->flags & NFS_MOUNT_UNSHARED))
2635                         s->s_iflags |= SB_I_MULTIROOT;
2636         }
2637 
2638         mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2639         if (IS_ERR(mntroot))
2640                 goto error_splat_super;
2641 
2642         error = mount_info->set_security(s, mntroot, mount_info);
2643         if (error)
2644                 goto error_splat_root;
2645 
2646         s->s_flags |= SB_ACTIVE;
2647 
2648 out:
2649         return mntroot;
2650 
2651 out_err_nosb:
2652         nfs_free_server(server);
2653         goto out;
2654 
2655 error_splat_root:
2656         dput(mntroot);
2657         mntroot = ERR_PTR(error);
2658 error_splat_super:
2659         deactivate_locked_super(s);
2660         goto out;
2661 }
2662 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2663 
2664 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2665         int flags, const char *dev_name, void *raw_data)
2666 {
2667         struct nfs_mount_info mount_info = {
2668                 .fill_super = nfs_fill_super,
2669                 .set_security = nfs_set_sb_security,
2670         };
2671         struct dentry *mntroot = ERR_PTR(-ENOMEM);
2672         struct nfs_subversion *nfs_mod;
2673         int error;
2674 
2675         mount_info.parsed = nfs_alloc_parsed_mount_data();
2676         mount_info.mntfh = nfs_alloc_fhandle();
2677         if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2678                 goto out;
2679 
2680         /* Validate the mount data */
2681         error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2682         if (error == NFS_TEXT_DATA)
2683                 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2684         if (error < 0) {
2685                 mntroot = ERR_PTR(error);
2686                 goto out;
2687         }
2688 
2689         nfs_mod = get_nfs_version(mount_info.parsed->version);
2690         if (IS_ERR(nfs_mod)) {
2691                 mntroot = ERR_CAST(nfs_mod);
2692                 goto out;
2693         }
2694 
2695         mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2696 
2697         put_nfs_version(nfs_mod);
2698 out:
2699         nfs_free_parsed_mount_data(mount_info.parsed);
2700         nfs_free_fhandle(mount_info.mntfh);
2701         return mntroot;
2702 }
2703 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2704 
2705 /*
2706  * Destroy an NFS2/3 superblock
2707  */
2708 void nfs_kill_super(struct super_block *s)
2709 {
2710         struct nfs_server *server = NFS_SB(s);
2711         dev_t dev = s->s_dev;
2712 
2713         generic_shutdown_super(s);
2714 
2715         nfs_fscache_release_super_cookie(s);
2716 
2717         nfs_free_server(server);
2718         free_anon_bdev(dev);
2719 }
2720 EXPORT_SYMBOL_GPL(nfs_kill_super);
2721 
2722 /*
2723  * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2724  */
2725 static struct dentry *
2726 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2727                 const char *dev_name, void *raw_data)
2728 {
2729         struct nfs_clone_mount *data = raw_data;
2730         struct nfs_mount_info mount_info = {
2731                 .fill_super = nfs_clone_super,
2732                 .set_security = nfs_clone_sb_security,
2733                 .cloned = data,
2734         };
2735         struct nfs_server *server;
2736         struct dentry *mntroot = ERR_PTR(-ENOMEM);
2737         struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2738 
2739         dprintk("--> nfs_xdev_mount()\n");
2740 
2741         mount_info.mntfh = mount_info.cloned->fh;
2742 
2743         /* create a new volume representation */
2744         server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2745 
2746         if (IS_ERR(server))
2747                 mntroot = ERR_CAST(server);
2748         else
2749                 mntroot = nfs_fs_mount_common(server, flags,
2750                                 dev_name, &mount_info, nfs_mod);
2751 
2752         dprintk("<-- nfs_xdev_mount() = %ld\n",
2753                         IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2754         return mntroot;
2755 }
2756 
2757 #if IS_ENABLED(CONFIG_NFS_V4)
2758 
2759 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2760 {
2761         args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2762                          NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2763 }
2764 
2765 /*
2766  * Validate NFSv4 mount options
2767  */
2768 static int nfs4_validate_mount_data(void *options,
2769                                     struct nfs_parsed_mount_data *args,
2770                                     const char *dev_name)
2771 {
2772         struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2773         struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2774         char *c;
2775 
2776         if (data == NULL)
2777                 goto out_no_data;
2778 
2779         args->version = 4;
2780 
2781         switch (data->version) {
2782         case 1:
2783                 if (data->host_addrlen > sizeof(args->nfs_server.address))
2784                         goto out_no_address;
2785                 if (data->host_addrlen == 0)
2786                         goto out_no_address;
2787                 args->nfs_server.addrlen = data->host_addrlen;
2788                 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2789                         return -EFAULT;
2790                 if (!nfs_verify_server_address(sap))
2791                         goto out_no_address;
2792                 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2793 
2794                 if (data->auth_flavourlen) {
2795                         rpc_authflavor_t pseudoflavor;
2796                         if (data->auth_flavourlen > 1)
2797                                 goto out_inval_auth;
2798                         if (copy_from_user(&pseudoflavor,
2799                                            data->auth_flavours,
2800                                            sizeof(pseudoflavor)))
2801                                 return -EFAULT;
2802                         args->selected_flavor = pseudoflavor;
2803                 } else
2804                         args->selected_flavor = RPC_AUTH_UNIX;
2805 
2806                 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2807                 if (IS_ERR(c))
2808                         return PTR_ERR(c);
2809                 args->nfs_server.hostname = c;
2810 
2811                 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2812                 if (IS_ERR(c))
2813                         return PTR_ERR(c);
2814                 args->nfs_server.export_path = c;
2815                 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2816 
2817                 c = strndup_user(data->client_addr.data, 16);
2818                 if (IS_ERR(c))
2819                         return PTR_ERR(c);
2820                 args->client_address = c;
2821 
2822                 /*
2823                  * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2824                  * can deal with.
2825                  */
2826 
2827                 args->flags     = data->flags & NFS4_MOUNT_FLAGMASK;
2828                 args->rsize     = data->rsize;
2829                 args->wsize     = data->wsize;
2830                 args->timeo     = data->timeo;
2831                 args->retrans   = data->retrans;
2832                 args->acregmin  = data->acregmin;
2833                 args->acregmax  = data->acregmax;
2834                 args->acdirmin  = data->acdirmin;
2835                 args->acdirmax  = data->acdirmax;
2836                 args->nfs_server.protocol = data->proto;
2837                 nfs_validate_transport_protocol(args);
2838                 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2839                         goto out_invalid_transport_udp;
2840 
2841                 break;
2842         default:
2843                 return NFS_TEXT_DATA;
2844         }
2845 
2846         return 0;
2847 
2848 out_no_data:
2849         dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2850         return -EINVAL;
2851 
2852 out_inval_auth:
2853         dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2854                  data->auth_flavourlen);
2855         return -EINVAL;
2856 
2857 out_no_address:
2858         dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2859         return -EINVAL;
2860 
2861 out_invalid_transport_udp:
2862         dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2863         return -EINVAL;
2864 }
2865 
2866 /*
2867  * NFS v4 module parameters need to stay in the
2868  * NFS client for backwards compatibility
2869  */
2870 unsigned int nfs_callback_set_tcpport;
2871 unsigned short nfs_callback_nr_threads;
2872 /* Default cache timeout is 10 minutes */
2873 unsigned int nfs_idmap_cache_timeout = 600;
2874 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2875 bool nfs4_disable_idmapping = true;
2876 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2877 unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE;
2878 unsigned short send_implementation_id = 1;
2879 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2880 bool recover_lost_locks = false;
2881 
2882 EXPORT_SYMBOL_GPL(nfs_callback_nr_threads);
2883 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2884 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2885 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2886 EXPORT_SYMBOL_GPL(max_session_slots);
2887 EXPORT_SYMBOL_GPL(max_session_cb_slots);
2888 EXPORT_SYMBOL_GPL(send_implementation_id);
2889 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2890 EXPORT_SYMBOL_GPL(recover_lost_locks);
2891 
2892 #define NFS_CALLBACK_MAXPORTNR (65535U)
2893 
2894 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2895 {
2896         unsigned long num;
2897         int ret;
2898 
2899         if (!val)
2900                 return -EINVAL;
2901         ret = kstrtoul(val, 0, &num);
2902         if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2903                 return -EINVAL;
2904         *((unsigned int *)kp->arg) = num;
2905         return 0;
2906 }
2907 static const struct kernel_param_ops param_ops_portnr = {
2908         .set = param_set_portnr,
2909         .get = param_get_uint,
2910 };
2911 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2912 
2913 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2914 module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644);
2915 MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be "
2916                 "assigned to the NFSv4 callback channels.");
2917 module_param(nfs_idmap_cache_timeout, int, 0644);
2918 module_param(nfs4_disable_idmapping, bool, 0644);
2919 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2920                         NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2921 MODULE_PARM_DESC(nfs4_disable_idmapping,
2922                 "Turn off NFSv4 idmapping when using 'sec=sys'");
2923 module_param(max_session_slots, ushort, 0644);
2924 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2925                 "requests the client will negotiate");
2926 module_param(max_session_cb_slots, ushort, 0644);
2927 MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 "
2928                 "callbacks the client will process for a given server");
2929 module_param(send_implementation_id, ushort, 0644);
2930 MODULE_PARM_DESC(send_implementation_id,
2931                 "Send implementation ID with NFSv4.1 exchange_id");
2932 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2933 
2934 module_param(recover_lost_locks, bool, 0644);
2935 MODULE_PARM_DESC(recover_lost_locks,
2936                  "If the server reports that a lock might be lost, "
2937                  "try to recover it risking data corruption.");
2938 
2939 
2940 #endif /* CONFIG_NFS_V4 */
2941 

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