4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
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())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
59 #include <asm/uaccess.h>
63 #include "delegation.h"
67 #include "nfs4session.h"
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
77 #define NFS_DEFAULT_VERSION 2
81 /* Mount options that take no arguments */
83 Opt_posix, Opt_noposix,
87 Opt_udp, Opt_tcp, Opt_rdma,
89 Opt_rdirplus, Opt_nordirplus,
90 Opt_sharecache, Opt_nosharecache,
91 Opt_resvport, Opt_noresvport,
92 Opt_fscache, Opt_nofscache,
93 Opt_migration, Opt_nomigration,
95 /* Mount options that take integer arguments */
97 Opt_rsize, Opt_wsize, Opt_bsize,
98 Opt_timeo, Opt_retrans,
99 Opt_acregmin, Opt_acregmax,
100 Opt_acdirmin, Opt_acdirmax,
107 /* Mount options that take string arguments */
109 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
110 Opt_addr, Opt_mountaddr, Opt_clientaddr,
115 /* Special mount options */
116 Opt_userspace, Opt_deprecated, Opt_sloppy,
121 static const match_table_t nfs_mount_option_tokens = {
122 { Opt_userspace, "bg" },
123 { Opt_userspace, "fg" },
124 { Opt_userspace, "retry=%s" },
126 { Opt_sloppy, "sloppy" },
128 { Opt_soft, "soft" },
129 { Opt_hard, "hard" },
130 { Opt_deprecated, "intr" },
131 { Opt_deprecated, "nointr" },
132 { Opt_posix, "posix" },
133 { Opt_noposix, "noposix" },
135 { Opt_nocto, "nocto" },
137 { Opt_noac, "noac" },
138 { Opt_lock, "lock" },
139 { Opt_nolock, "nolock" },
142 { Opt_rdma, "rdma" },
144 { Opt_noacl, "noacl" },
145 { Opt_rdirplus, "rdirplus" },
146 { Opt_nordirplus, "nordirplus" },
147 { Opt_sharecache, "sharecache" },
148 { Opt_nosharecache, "nosharecache" },
149 { Opt_resvport, "resvport" },
150 { Opt_noresvport, "noresvport" },
151 { Opt_fscache, "fsc" },
152 { Opt_nofscache, "nofsc" },
153 { Opt_migration, "migration" },
154 { Opt_nomigration, "nomigration" },
156 { Opt_port, "port=%s" },
157 { Opt_rsize, "rsize=%s" },
158 { Opt_wsize, "wsize=%s" },
159 { Opt_bsize, "bsize=%s" },
160 { Opt_timeo, "timeo=%s" },
161 { Opt_retrans, "retrans=%s" },
162 { Opt_acregmin, "acregmin=%s" },
163 { Opt_acregmax, "acregmax=%s" },
164 { Opt_acdirmin, "acdirmin=%s" },
165 { Opt_acdirmax, "acdirmax=%s" },
166 { Opt_actimeo, "actimeo=%s" },
167 { Opt_namelen, "namlen=%s" },
168 { Opt_mountport, "mountport=%s" },
169 { Opt_mountvers, "mountvers=%s" },
170 { Opt_minorversion, "minorversion=%s" },
172 { Opt_nfsvers, "nfsvers=%s" },
173 { Opt_nfsvers, "vers=%s" },
175 { Opt_sec, "sec=%s" },
176 { Opt_proto, "proto=%s" },
177 { Opt_mountproto, "mountproto=%s" },
178 { Opt_addr, "addr=%s" },
179 { Opt_clientaddr, "clientaddr=%s" },
180 { Opt_mounthost, "mounthost=%s" },
181 { Opt_mountaddr, "mountaddr=%s" },
183 { Opt_lookupcache, "lookupcache=%s" },
184 { Opt_fscache_uniq, "fsc=%s" },
185 { Opt_local_lock, "local_lock=%s" },
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers, "v%s" },
194 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
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" },
206 { Opt_xprt_err, NULL }
210 Opt_sec_none, Opt_sec_sys,
211 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
212 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
213 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
218 static const match_table_t nfs_secflavor_tokens = {
219 { Opt_sec_none, "none" },
220 { Opt_sec_none, "null" },
221 { Opt_sec_sys, "sys" },
223 { Opt_sec_krb5, "krb5" },
224 { Opt_sec_krb5i, "krb5i" },
225 { Opt_sec_krb5p, "krb5p" },
227 { Opt_sec_lkey, "lkey" },
228 { Opt_sec_lkeyi, "lkeyi" },
229 { Opt_sec_lkeyp, "lkeyp" },
231 { Opt_sec_spkm, "spkm3" },
232 { Opt_sec_spkmi, "spkm3i" },
233 { Opt_sec_spkmp, "spkm3p" },
235 { Opt_sec_err, NULL }
239 Opt_lookupcache_all, Opt_lookupcache_positive,
240 Opt_lookupcache_none,
245 static match_table_t nfs_lookupcache_tokens = {
246 { Opt_lookupcache_all, "all" },
247 { Opt_lookupcache_positive, "pos" },
248 { Opt_lookupcache_positive, "positive" },
249 { Opt_lookupcache_none, "none" },
251 { Opt_lookupcache_err, NULL }
255 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
261 static match_table_t nfs_local_lock_tokens = {
262 { Opt_local_lock_all, "all" },
263 { Opt_local_lock_flock, "flock" },
264 { Opt_local_lock_posix, "posix" },
265 { Opt_local_lock_none, "none" },
267 { Opt_local_lock_err, NULL }
271 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
272 Opt_vers_4_1, Opt_vers_4_2,
277 static match_table_t nfs_vers_tokens = {
281 { Opt_vers_4_0, "4.0" },
282 { Opt_vers_4_1, "4.1" },
283 { Opt_vers_4_2, "4.2" },
285 { Opt_vers_err, NULL }
288 static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
291 struct file_system_type nfs_fs_type = {
292 .owner = THIS_MODULE,
294 .mount = nfs_fs_mount,
295 .kill_sb = nfs_kill_super,
296 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
298 MODULE_ALIAS_FS("nfs");
299 EXPORT_SYMBOL_GPL(nfs_fs_type);
301 struct file_system_type nfs_xdev_fs_type = {
302 .owner = THIS_MODULE,
304 .mount = nfs_xdev_mount,
305 .kill_sb = nfs_kill_super,
306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
309 const struct super_operations nfs_sops = {
310 .alloc_inode = nfs_alloc_inode,
311 .destroy_inode = nfs_destroy_inode,
312 .write_inode = nfs_write_inode,
313 .drop_inode = nfs_drop_inode,
314 .statfs = nfs_statfs,
315 .evict_inode = nfs_evict_inode,
316 .umount_begin = nfs_umount_begin,
317 .show_options = nfs_show_options,
318 .show_devname = nfs_show_devname,
319 .show_path = nfs_show_path,
320 .show_stats = nfs_show_stats,
321 .remount_fs = nfs_remount,
323 EXPORT_SYMBOL_GPL(nfs_sops);
325 #if IS_ENABLED(CONFIG_NFS_V4)
326 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
327 static int nfs4_validate_mount_data(void *options,
328 struct nfs_parsed_mount_data *args, const char *dev_name);
330 struct file_system_type nfs4_fs_type = {
331 .owner = THIS_MODULE,
333 .mount = nfs_fs_mount,
334 .kill_sb = nfs_kill_super,
335 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
337 MODULE_ALIAS_FS("nfs4");
338 MODULE_ALIAS("nfs4");
339 EXPORT_SYMBOL_GPL(nfs4_fs_type);
341 static int __init register_nfs4_fs(void)
343 return register_filesystem(&nfs4_fs_type);
346 static void unregister_nfs4_fs(void)
348 unregister_filesystem(&nfs4_fs_type);
351 static int __init register_nfs4_fs(void)
356 static void unregister_nfs4_fs(void)
361 static struct shrinker acl_shrinker = {
362 .count_objects = nfs_access_cache_count,
363 .scan_objects = nfs_access_cache_scan,
364 .seeks = DEFAULT_SEEKS,
368 * Register the NFS filesystems
370 int __init register_nfs_fs(void)
374 ret = register_filesystem(&nfs_fs_type);
378 ret = register_nfs4_fs();
382 ret = nfs_register_sysctl();
385 register_shrinker(&acl_shrinker);
389 unregister_nfs4_fs();
391 unregister_filesystem(&nfs_fs_type);
397 * Unregister the NFS filesystems
399 void __exit unregister_nfs_fs(void)
401 unregister_shrinker(&acl_shrinker);
402 nfs_unregister_sysctl();
403 unregister_nfs4_fs();
404 unregister_filesystem(&nfs_fs_type);
407 void nfs_sb_active(struct super_block *sb)
409 struct nfs_server *server = NFS_SB(sb);
411 if (atomic_inc_return(&server->active) == 1)
412 atomic_inc(&sb->s_active);
414 EXPORT_SYMBOL_GPL(nfs_sb_active);
416 void nfs_sb_deactive(struct super_block *sb)
418 struct nfs_server *server = NFS_SB(sb);
420 if (atomic_dec_and_test(&server->active))
421 deactivate_super(sb);
423 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
426 * Deliver file system statistics to userspace
428 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
430 struct nfs_server *server = NFS_SB(dentry->d_sb);
431 unsigned char blockbits;
432 unsigned long blockres;
433 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
434 struct nfs_fsstat res;
437 res.fattr = nfs_alloc_fattr();
438 if (res.fattr == NULL)
441 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
442 if (unlikely(error == -ESTALE)) {
443 struct dentry *pd_dentry;
445 pd_dentry = dget_parent(dentry);
446 if (pd_dentry != NULL) {
447 nfs_zap_caches(pd_dentry->d_inode);
451 nfs_free_fattr(res.fattr);
455 buf->f_type = NFS_SUPER_MAGIC;
458 * Current versions of glibc do not correctly handle the
459 * case where f_frsize != f_bsize. Eventually we want to
460 * report the value of wtmult in this field.
462 buf->f_frsize = dentry->d_sb->s_blocksize;
465 * On most *nix systems, f_blocks, f_bfree, and f_bavail
466 * are reported in units of f_frsize. Linux hasn't had
467 * an f_frsize field in its statfs struct until recently,
468 * thus historically Linux's sys_statfs reports these
469 * fields in units of f_bsize.
471 buf->f_bsize = dentry->d_sb->s_blocksize;
472 blockbits = dentry->d_sb->s_blocksize_bits;
473 blockres = (1 << blockbits) - 1;
474 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
475 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
476 buf->f_bavail = (res.abytes + blockres) >> blockbits;
478 buf->f_files = res.tfiles;
479 buf->f_ffree = res.afiles;
481 buf->f_namelen = server->namelen;
486 dprintk("%s: statfs error = %d\n", __func__, -error);
489 EXPORT_SYMBOL_GPL(nfs_statfs);
492 * Map the security flavour number to a name
494 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
496 static const struct {
497 rpc_authflavor_t flavour;
499 } sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = {
500 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
501 { RPC_AUTH_NULL, "null" },
502 { RPC_AUTH_UNIX, "sys" },
503 { RPC_AUTH_GSS_KRB5, "krb5" },
504 { RPC_AUTH_GSS_KRB5I, "krb5i" },
505 { RPC_AUTH_GSS_KRB5P, "krb5p" },
506 { RPC_AUTH_GSS_LKEY, "lkey" },
507 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
508 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
509 { RPC_AUTH_GSS_SPKM, "spkm" },
510 { RPC_AUTH_GSS_SPKMI, "spkmi" },
511 { RPC_AUTH_GSS_SPKMP, "spkmp" },
512 { UINT_MAX, "unknown" }
516 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
517 if (sec_flavours[i].flavour == flavour)
520 return sec_flavours[i].str;
523 static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
526 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
528 seq_printf(m, ",mountproto=");
529 switch (sap->sa_family) {
531 switch (nfss->mountd_protocol) {
533 seq_printf(m, RPCBIND_NETID_UDP);
536 seq_printf(m, RPCBIND_NETID_TCP);
540 seq_printf(m, "auto");
544 switch (nfss->mountd_protocol) {
546 seq_printf(m, RPCBIND_NETID_UDP6);
549 seq_printf(m, RPCBIND_NETID_TCP6);
553 seq_printf(m, "auto");
558 seq_printf(m, "auto");
562 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
565 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
567 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
570 switch (sap->sa_family) {
572 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
573 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
577 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
578 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
583 seq_printf(m, ",mountaddr=unspecified");
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) ||
591 seq_printf(m, ",mountport=%u", nfss->mountd_port);
593 nfs_show_mountd_netid(m, nfss, showdefaults);
596 #if IS_ENABLED(CONFIG_NFS_V4)
597 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
600 struct nfs_client *clp = nfss->nfs_client;
602 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
605 static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
611 static void nfs_show_nfs_version(struct seq_file *m,
612 unsigned int version,
613 unsigned int minorversion)
615 seq_printf(m, ",vers=%u", version);
617 seq_printf(m, ".%u", minorversion);
621 * Describe the mount options in force on this server representation
623 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
626 static const struct proc_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", "" },
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;
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);
665 seq_puts(m, nfs_infop->nostr);
668 seq_printf(m, ",proto=%s",
669 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
672 if (nfss->port != NFS_PORT)
673 seq_printf(m, ",port=%u", nfss->port);
676 seq_printf(m, ",port=%u", nfss->port);
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));
683 nfs_show_mountd_options(m, nfss, showdefaults);
685 nfs_show_nfsv4_options(m, nfss, showdefaults);
687 if (nfss->options & NFS_OPTION_FSCACHE)
688 seq_printf(m, ",fsc");
690 if (nfss->options & NFS_OPTION_MIGRATION)
691 seq_printf(m, ",migration");
693 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
694 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
695 seq_printf(m, ",lookupcache=none");
697 seq_printf(m, ",lookupcache=pos");
700 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
701 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
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");
710 seq_printf(m, ",local_lock=posix");
714 * Describe the mount options on this VFS mountpoint
716 int nfs_show_options(struct seq_file *m, struct dentry *root)
718 struct nfs_server *nfss = NFS_SB(root->d_sb);
720 nfs_show_mount_options(m, nfss, 0);
723 seq_printf(m, ",addr=%s",
724 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
730 EXPORT_SYMBOL_GPL(nfs_show_options);
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)
736 if (nfs4_has_session(server->nfs_client))
737 seq_printf(m, ",sessions");
740 static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
744 #ifdef CONFIG_NFS_V4_1
745 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
747 seq_printf(m, ",pnfs=");
748 if (server->pnfs_curr_ld)
749 seq_printf(m, "%s", server->pnfs_curr_ld->name);
751 seq_printf(m, "not configured");
754 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
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',"
760 impl_id->name, impl_id->domain,
761 impl_id->date.seconds, impl_id->date.nseconds);
765 #if IS_ENABLED(CONFIG_NFS_V4)
766 static void show_pnfs(struct seq_file *m, struct nfs_server *server)
770 static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
775 int nfs_show_devname(struct seq_file *m, struct dentry *root)
777 char *page = (char *) __get_free_page(GFP_KERNEL);
778 char *devname, *dummy;
782 devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0);
784 err = PTR_ERR(devname);
786 seq_escape(m, devname, " \t\n\\");
787 free_page((unsigned long)page);
790 EXPORT_SYMBOL_GPL(nfs_show_devname);
792 int nfs_show_path(struct seq_file *m, struct dentry *dentry)
797 EXPORT_SYMBOL_GPL(nfs_show_path);
800 * Present statistical information for this VFS mountpoint
802 int nfs_show_stats(struct seq_file *m, struct dentry *root)
805 struct nfs_server *nfss = NFS_SB(root->d_sb);
806 struct rpc_auth *auth = nfss->client->cl_auth;
807 struct nfs_iostats totals = { };
809 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
812 * Display all mount option settings
814 seq_printf(m, "\n\topts:\t");
815 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
816 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
817 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
818 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
819 nfs_show_mount_options(m, nfss, 1);
821 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
823 show_implementation_id(m, nfss);
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);
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);
845 * Display security flavor in effect for this mount
847 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
849 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
852 * Display superblock I/O counters
854 for_each_possible_cpu(cpu) {
855 struct nfs_iostats *stats;
858 stats = per_cpu_ptr(nfss->io_stats, cpu);
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];
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.bytes[i]);
887 rpc_print_iostats(m, nfss->client);
891 EXPORT_SYMBOL_GPL(nfs_show_stats);
894 * Begin unmount by attempting to remove all automounted mountpoints we added
895 * in response to xdev traversals and referrals
897 void nfs_umount_begin(struct super_block *sb)
899 struct nfs_server *server;
900 struct rpc_clnt *rpc;
903 /* -EIO all pending I/O */
904 rpc = server->client_acl;
906 rpc_killall_tasks(rpc);
907 rpc = server->client;
909 rpc_killall_tasks(rpc);
911 EXPORT_SYMBOL_GPL(nfs_umount_begin);
913 static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
915 struct nfs_parsed_mount_data *data;
917 data = kzalloc(sizeof(*data), GFP_KERNEL);
919 data->acregmin = NFS_DEF_ACREGMIN;
920 data->acregmax = NFS_DEF_ACREGMAX;
921 data->acdirmin = NFS_DEF_ACDIRMIN;
922 data->acdirmax = NFS_DEF_ACDIRMAX;
923 data->mount_server.port = NFS_UNSPEC_PORT;
924 data->nfs_server.port = NFS_UNSPEC_PORT;
925 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
926 data->selected_flavor = RPC_AUTH_MAXFLAVOR;
927 data->minorversion = 0;
928 data->need_mount = true;
929 data->net = current->nsproxy->net_ns;
930 security_init_mnt_opts(&data->lsm_opts);
935 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
938 kfree(data->client_address);
939 kfree(data->mount_server.hostname);
940 kfree(data->nfs_server.export_path);
941 kfree(data->nfs_server.hostname);
942 kfree(data->fscache_uniq);
943 security_free_mnt_opts(&data->lsm_opts);
949 * Sanity-check a server address provided by the mount command.
951 * Address family must be initialized, and address must not be
952 * the ANY address for that family.
954 static int nfs_verify_server_address(struct sockaddr *addr)
956 switch (addr->sa_family) {
958 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
959 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
962 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
963 return !ipv6_addr_any(sa);
967 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
972 * Select between a default port value and a user-specified port value.
973 * If a zero value is set, then autobind will be used.
975 static void nfs_set_port(struct sockaddr *sap, int *port,
976 const unsigned short default_port)
978 if (*port == NFS_UNSPEC_PORT)
979 *port = default_port;
981 rpc_set_port(sap, *port);
985 * Sanity check the NFS transport protocol.
988 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
990 switch (mnt->nfs_server.protocol) {
991 case XPRT_TRANSPORT_UDP:
992 case XPRT_TRANSPORT_TCP:
993 case XPRT_TRANSPORT_RDMA:
996 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1001 * For text based NFSv2/v3 mounts, the mount protocol transport default
1002 * settings should depend upon the specified NFS transport.
1004 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1006 nfs_validate_transport_protocol(mnt);
1008 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1009 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1011 switch (mnt->nfs_server.protocol) {
1012 case XPRT_TRANSPORT_UDP:
1013 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1015 case XPRT_TRANSPORT_TCP:
1016 case XPRT_TRANSPORT_RDMA:
1017 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1022 * Add 'flavor' to 'auth_info' if not already present.
1023 * Returns true if 'flavor' ends up in the list, false otherwise
1025 static bool nfs_auth_info_add(struct nfs_auth_info *auth_info,
1026 rpc_authflavor_t flavor)
1029 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors);
1031 /* make sure this flavor isn't already in the list */
1032 for (i = 0; i < auth_info->flavor_len; i++) {
1033 if (flavor == auth_info->flavors[i])
1037 if (auth_info->flavor_len + 1 >= max_flavor_len) {
1038 dfprintk(MOUNT, "NFS: too many sec= flavors\n");
1042 auth_info->flavors[auth_info->flavor_len++] = flavor;
1047 * Return true if 'match' is in auth_info or auth_info is empty.
1048 * Return false otherwise.
1050 bool nfs_auth_info_match(const struct nfs_auth_info *auth_info,
1051 rpc_authflavor_t match)
1055 if (!auth_info->flavor_len)
1058 for (i = 0; i < auth_info->flavor_len; i++) {
1059 if (auth_info->flavors[i] == match)
1064 EXPORT_SYMBOL_GPL(nfs_auth_info_match);
1067 * Parse the value of the 'sec=' option.
1069 static int nfs_parse_security_flavors(char *value,
1070 struct nfs_parsed_mount_data *mnt)
1072 substring_t args[MAX_OPT_ARGS];
1073 rpc_authflavor_t pseudoflavor;
1076 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1078 while ((p = strsep(&value, ":")) != NULL) {
1079 switch (match_token(p, nfs_secflavor_tokens, args)) {
1081 pseudoflavor = RPC_AUTH_NULL;
1084 pseudoflavor = RPC_AUTH_UNIX;
1087 pseudoflavor = RPC_AUTH_GSS_KRB5;
1090 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1093 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1096 pseudoflavor = RPC_AUTH_GSS_LKEY;
1099 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1102 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1105 pseudoflavor = RPC_AUTH_GSS_SPKM;
1108 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1111 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1115 "NFS: sec= option '%s' not recognized\n", p);
1119 if (!nfs_auth_info_add(&mnt->auth_info, pseudoflavor))
1126 static int nfs_parse_version_string(char *string,
1127 struct nfs_parsed_mount_data *mnt,
1130 mnt->flags &= ~NFS_MOUNT_VER3;
1131 switch (match_token(string, nfs_vers_tokens, args)) {
1136 mnt->flags |= NFS_MOUNT_VER3;
1140 /* Backward compatibility option. In future,
1141 * the mount program should always supply
1142 * a NFSv4 minor version number.
1148 mnt->minorversion = 0;
1152 mnt->minorversion = 1;
1156 mnt->minorversion = 2;
1164 static int nfs_get_option_str(substring_t args[], char **option)
1167 *option = match_strdup(args);
1171 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1176 string = match_strdup(args);
1179 rc = kstrtoul(string, 10, option);
1186 * Error-check and convert a string of mount options from user space into
1187 * a data structure. The whole mount string is processed; bad options are
1188 * skipped as they are encountered. If there were no errors, return 1;
1189 * otherwise return 0 (zero).
1191 static int nfs_parse_mount_options(char *raw,
1192 struct nfs_parsed_mount_data *mnt)
1194 char *p, *string, *secdata;
1195 int rc, sloppy = 0, invalid_option = 0;
1196 unsigned short protofamily = AF_UNSPEC;
1197 unsigned short mountfamily = AF_UNSPEC;
1200 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1203 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1205 secdata = alloc_secdata();
1209 rc = security_sb_copy_data(raw, secdata);
1211 goto out_security_failure;
1213 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1215 goto out_security_failure;
1217 free_secdata(secdata);
1219 while ((p = strsep(&raw, ",")) != NULL) {
1220 substring_t args[MAX_OPT_ARGS];
1221 unsigned long option;
1227 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1229 token = match_token(p, nfs_mount_option_tokens, args);
1233 * boolean options: foo/nofoo
1236 mnt->flags |= NFS_MOUNT_SOFT;
1239 mnt->flags &= ~NFS_MOUNT_SOFT;
1242 mnt->flags |= NFS_MOUNT_POSIX;
1245 mnt->flags &= ~NFS_MOUNT_POSIX;
1248 mnt->flags &= ~NFS_MOUNT_NOCTO;
1251 mnt->flags |= NFS_MOUNT_NOCTO;
1254 mnt->flags &= ~NFS_MOUNT_NOAC;
1257 mnt->flags |= NFS_MOUNT_NOAC;
1260 mnt->flags &= ~NFS_MOUNT_NONLM;
1261 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1262 NFS_MOUNT_LOCAL_FCNTL);
1265 mnt->flags |= NFS_MOUNT_NONLM;
1266 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1267 NFS_MOUNT_LOCAL_FCNTL);
1270 mnt->flags &= ~NFS_MOUNT_TCP;
1271 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1274 mnt->flags |= NFS_MOUNT_TCP;
1275 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1278 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1279 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1280 xprt_load_transport(p);
1283 mnt->flags &= ~NFS_MOUNT_NOACL;
1286 mnt->flags |= NFS_MOUNT_NOACL;
1289 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1291 case Opt_nordirplus:
1292 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1294 case Opt_sharecache:
1295 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1297 case Opt_nosharecache:
1298 mnt->flags |= NFS_MOUNT_UNSHARED;
1301 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1303 case Opt_noresvport:
1304 mnt->flags |= NFS_MOUNT_NORESVPORT;
1307 mnt->options |= NFS_OPTION_FSCACHE;
1308 kfree(mnt->fscache_uniq);
1309 mnt->fscache_uniq = NULL;
1312 mnt->options &= ~NFS_OPTION_FSCACHE;
1313 kfree(mnt->fscache_uniq);
1314 mnt->fscache_uniq = NULL;
1317 mnt->options |= NFS_OPTION_MIGRATION;
1319 case Opt_nomigration:
1320 mnt->options &= NFS_OPTION_MIGRATION;
1324 * options that take numeric values
1327 if (nfs_get_option_ul(args, &option) ||
1329 goto out_invalid_value;
1330 mnt->nfs_server.port = option;
1333 if (nfs_get_option_ul(args, &option))
1334 goto out_invalid_value;
1335 mnt->rsize = option;
1338 if (nfs_get_option_ul(args, &option))
1339 goto out_invalid_value;
1340 mnt->wsize = option;
1343 if (nfs_get_option_ul(args, &option))
1344 goto out_invalid_value;
1345 mnt->bsize = option;
1348 if (nfs_get_option_ul(args, &option) || option == 0)
1349 goto out_invalid_value;
1350 mnt->timeo = option;
1353 if (nfs_get_option_ul(args, &option) || option == 0)
1354 goto out_invalid_value;
1355 mnt->retrans = option;
1358 if (nfs_get_option_ul(args, &option))
1359 goto out_invalid_value;
1360 mnt->acregmin = option;
1363 if (nfs_get_option_ul(args, &option))
1364 goto out_invalid_value;
1365 mnt->acregmax = option;
1368 if (nfs_get_option_ul(args, &option))
1369 goto out_invalid_value;
1370 mnt->acdirmin = option;
1373 if (nfs_get_option_ul(args, &option))
1374 goto out_invalid_value;
1375 mnt->acdirmax = option;
1378 if (nfs_get_option_ul(args, &option))
1379 goto out_invalid_value;
1380 mnt->acregmin = mnt->acregmax =
1381 mnt->acdirmin = mnt->acdirmax = option;
1384 if (nfs_get_option_ul(args, &option))
1385 goto out_invalid_value;
1386 mnt->namlen = option;
1389 if (nfs_get_option_ul(args, &option) ||
1391 goto out_invalid_value;
1392 mnt->mount_server.port = option;
1395 if (nfs_get_option_ul(args, &option) ||
1396 option < NFS_MNT_VERSION ||
1397 option > NFS_MNT3_VERSION)
1398 goto out_invalid_value;
1399 mnt->mount_server.version = option;
1401 case Opt_minorversion:
1402 if (nfs_get_option_ul(args, &option))
1403 goto out_invalid_value;
1404 if (option > NFS4_MAX_MINOR_VERSION)
1405 goto out_invalid_value;
1406 mnt->minorversion = option;
1410 * options that take text values
1413 string = match_strdup(args);
1416 rc = nfs_parse_version_string(string, mnt, args);
1419 goto out_invalid_value;
1422 string = match_strdup(args);
1425 rc = nfs_parse_security_flavors(string, mnt);
1428 dfprintk(MOUNT, "NFS: unrecognized "
1429 "security flavor\n");
1434 string = match_strdup(args);
1437 token = match_token(string,
1438 nfs_xprt_protocol_tokens, args);
1440 protofamily = AF_INET;
1443 protofamily = AF_INET6;
1445 mnt->flags &= ~NFS_MOUNT_TCP;
1446 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1449 protofamily = AF_INET6;
1451 mnt->flags |= NFS_MOUNT_TCP;
1452 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1455 /* vector side protocols to TCP */
1456 mnt->flags |= NFS_MOUNT_TCP;
1457 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1458 xprt_load_transport(string);
1461 dfprintk(MOUNT, "NFS: unrecognized "
1462 "transport protocol\n");
1468 case Opt_mountproto:
1469 string = match_strdup(args);
1472 token = match_token(string,
1473 nfs_xprt_protocol_tokens, args);
1476 mountfamily = AF_INET;
1479 mountfamily = AF_INET6;
1481 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1484 mountfamily = AF_INET6;
1486 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1488 case Opt_xprt_rdma: /* not used for side protocols */
1490 dfprintk(MOUNT, "NFS: unrecognized "
1491 "transport protocol\n");
1496 string = match_strdup(args);
1499 mnt->nfs_server.addrlen =
1500 rpc_pton(mnt->net, string, strlen(string),
1502 &mnt->nfs_server.address,
1503 sizeof(mnt->nfs_server.address));
1505 if (mnt->nfs_server.addrlen == 0)
1506 goto out_invalid_address;
1508 case Opt_clientaddr:
1509 if (nfs_get_option_str(args, &mnt->client_address))
1513 if (nfs_get_option_str(args,
1514 &mnt->mount_server.hostname))
1518 string = match_strdup(args);
1521 mnt->mount_server.addrlen =
1522 rpc_pton(mnt->net, string, strlen(string),
1524 &mnt->mount_server.address,
1525 sizeof(mnt->mount_server.address));
1527 if (mnt->mount_server.addrlen == 0)
1528 goto out_invalid_address;
1530 case Opt_lookupcache:
1531 string = match_strdup(args);
1534 token = match_token(string,
1535 nfs_lookupcache_tokens, args);
1538 case Opt_lookupcache_all:
1539 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1541 case Opt_lookupcache_positive:
1542 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1543 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1545 case Opt_lookupcache_none:
1546 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1549 dfprintk(MOUNT, "NFS: invalid "
1550 "lookupcache argument\n");
1554 case Opt_fscache_uniq:
1555 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1557 mnt->options |= NFS_OPTION_FSCACHE;
1559 case Opt_local_lock:
1560 string = match_strdup(args);
1563 token = match_token(string, nfs_local_lock_tokens,
1567 case Opt_local_lock_all:
1568 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1569 NFS_MOUNT_LOCAL_FCNTL);
1571 case Opt_local_lock_flock:
1572 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1574 case Opt_local_lock_posix:
1575 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1577 case Opt_local_lock_none:
1578 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1579 NFS_MOUNT_LOCAL_FCNTL);
1582 dfprintk(MOUNT, "NFS: invalid "
1583 "local_lock argument\n");
1593 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1596 case Opt_deprecated:
1597 dfprintk(MOUNT, "NFS: ignoring mount option "
1603 dfprintk(MOUNT, "NFS: unrecognized mount option "
1608 if (!sloppy && invalid_option)
1611 if (mnt->minorversion && mnt->version != 4)
1612 goto out_minorversion_mismatch;
1614 if (mnt->options & NFS_OPTION_MIGRATION &&
1615 (mnt->version != 4 || mnt->minorversion != 0))
1616 goto out_migration_misuse;
1619 * verify that any proto=/mountproto= options match the address
1620 * families in the addr=/mountaddr= options.
1622 if (protofamily != AF_UNSPEC &&
1623 protofamily != mnt->nfs_server.address.ss_family)
1624 goto out_proto_mismatch;
1626 if (mountfamily != AF_UNSPEC) {
1627 if (mnt->mount_server.addrlen) {
1628 if (mountfamily != mnt->mount_server.address.ss_family)
1629 goto out_mountproto_mismatch;
1631 if (mountfamily != mnt->nfs_server.address.ss_family)
1632 goto out_mountproto_mismatch;
1638 out_mountproto_mismatch:
1639 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1643 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1645 out_invalid_address:
1646 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1649 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1651 out_minorversion_mismatch:
1652 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1653 "minorversion=%u\n", mnt->version, mnt->minorversion);
1655 out_migration_misuse:
1657 "NFS: 'migration' not supported for this NFS version\n");
1660 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1662 out_security_failure:
1663 free_secdata(secdata);
1664 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1669 * Ensure that a specified authtype in args->auth_info is supported by
1670 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1673 static int nfs_verify_authflavors(struct nfs_parsed_mount_data *args,
1674 rpc_authflavor_t *server_authlist, unsigned int count)
1676 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
1680 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1681 * must be in the list returned by the server.
1683 * AUTH_NULL has a special meaning when it's in the server list - it
1684 * means that the server will ignore the rpc creds, so any flavor
1687 for (i = 0; i < count; i++) {
1688 flavor = server_authlist[i];
1690 if (nfs_auth_info_match(&args->auth_info, flavor) ||
1691 flavor == RPC_AUTH_NULL)
1696 "NFS: specified auth flavors not supported by server\n");
1700 args->selected_flavor = flavor;
1701 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->selected_flavor);
1706 * Use the remote server's MOUNT service to request the NFS file handle
1707 * corresponding to the provided path.
1709 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1710 struct nfs_fh *root_fh,
1711 rpc_authflavor_t *server_authlist,
1712 unsigned int *server_authlist_len)
1714 struct nfs_mount_request request = {
1715 .sap = (struct sockaddr *)
1716 &args->mount_server.address,
1717 .dirpath = args->nfs_server.export_path,
1718 .protocol = args->mount_server.protocol,
1720 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1721 .auth_flav_len = server_authlist_len,
1722 .auth_flavs = server_authlist,
1727 if (args->mount_server.version == 0) {
1728 switch (args->version) {
1730 args->mount_server.version = NFS_MNT3_VERSION;
1733 args->mount_server.version = NFS_MNT_VERSION;
1736 request.version = args->mount_server.version;
1738 if (args->mount_server.hostname)
1739 request.hostname = args->mount_server.hostname;
1741 request.hostname = args->nfs_server.hostname;
1744 * Construct the mount server's address.
1746 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1747 memcpy(request.sap, &args->nfs_server.address,
1748 args->nfs_server.addrlen);
1749 args->mount_server.addrlen = args->nfs_server.addrlen;
1751 request.salen = args->mount_server.addrlen;
1752 nfs_set_port(request.sap, &args->mount_server.port, 0);
1755 * Now ask the mount server to map our export path
1758 status = nfs_mount(&request);
1760 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1761 request.hostname, status);
1768 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1769 struct nfs_subversion *nfs_mod)
1773 bool tried_auth_unix = false;
1774 bool auth_null_in_list = false;
1775 struct nfs_server *server = ERR_PTR(-EACCES);
1776 struct nfs_parsed_mount_data *args = mount_info->parsed;
1777 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1778 unsigned int authlist_len = ARRAY_SIZE(authlist);
1780 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1783 return ERR_PTR(status);
1786 * Was a sec= authflavor specified in the options? First, verify
1787 * whether the server supports it, and then just try to use it if so.
1789 if (args->auth_info.flavor_len > 0) {
1790 status = nfs_verify_authflavors(args, authlist, authlist_len);
1791 dfprintk(MOUNT, "NFS: using auth flavor %u\n",
1792 args->selected_flavor);
1794 return ERR_PTR(status);
1795 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1799 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1800 * SHOULD prefer the flavor listed first. However, some servers list
1801 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1803 for (i = 0; i < authlist_len; ++i) {
1804 rpc_authflavor_t flavor;
1805 struct rpcsec_gss_info info;
1807 flavor = authlist[i];
1810 tried_auth_unix = true;
1813 auth_null_in_list = true;
1816 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1820 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1821 args->selected_flavor = flavor;
1822 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1823 if (!IS_ERR(server))
1828 * Nothing we tried so far worked. At this point, give up if we've
1829 * already tried AUTH_UNIX or if the server's list doesn't contain
1832 if (tried_auth_unix || !auth_null_in_list)
1835 /* Last chance! Try AUTH_UNIX */
1836 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1837 args->selected_flavor = RPC_AUTH_UNIX;
1838 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1841 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1842 struct nfs_mount_info *mount_info,
1843 struct nfs_subversion *nfs_mod)
1845 struct nfs_server *server;
1847 if (mount_info->parsed->need_mount)
1848 server = nfs_try_mount_request(mount_info, nfs_mod);
1850 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1853 return ERR_CAST(server);
1855 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1857 EXPORT_SYMBOL_GPL(nfs_try_mount);
1860 * Split "dev_name" into "hostname:export_path".
1862 * The leftmost colon demarks the split between the server's hostname
1863 * and the export path. If the hostname starts with a left square
1864 * bracket, then it may contain colons.
1866 * Note: caller frees hostname and export path, even on error.
1868 static int nfs_parse_devname(const char *dev_name,
1869 char **hostname, size_t maxnamlen,
1870 char **export_path, size_t maxpathlen)
1875 /* Is the host name protected with square brakcets? */
1876 if (*dev_name == '[') {
1877 end = strchr(++dev_name, ']');
1878 if (end == NULL || end[1] != ':')
1879 goto out_bad_devname;
1881 len = end - dev_name;
1886 end = strchr(dev_name, ':');
1888 goto out_bad_devname;
1889 len = end - dev_name;
1891 /* kill possible hostname list: not supported */
1892 comma = strchr(dev_name, ',');
1893 if (comma != NULL && comma < end)
1897 if (len > maxnamlen)
1900 /* N.B. caller will free nfs_server.hostname in all cases */
1901 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1902 if (*hostname == NULL)
1904 len = strlen(++end);
1905 if (len > maxpathlen)
1907 *export_path = kstrndup(end, len, GFP_KERNEL);
1911 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1915 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1919 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1923 dfprintk(MOUNT, "NFS: server hostname too long\n");
1924 return -ENAMETOOLONG;
1927 dfprintk(MOUNT, "NFS: export pathname too long\n");
1928 return -ENAMETOOLONG;
1932 * Validate the NFS2/NFS3 mount data
1933 * - fills in the mount root filehandle
1935 * For option strings, user space handles the following behaviors:
1937 * + DNS: mapping server host name to IP address ("addr=" option)
1939 * + failure mode: how to behave if a mount request can't be handled
1940 * immediately ("fg/bg" option)
1942 * + retry: how often to retry a mount request ("retry=" option)
1944 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1945 * mountproto=tcp after mountproto=udp, and so on
1947 static int nfs23_validate_mount_data(void *options,
1948 struct nfs_parsed_mount_data *args,
1949 struct nfs_fh *mntfh,
1950 const char *dev_name)
1952 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1953 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1954 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1959 args->version = NFS_DEFAULT_VERSION;
1960 switch (data->version) {
1966 if (data->flags & NFS_MOUNT_VER3)
1968 data->root.size = NFS2_FHSIZE;
1969 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1970 /* Turn off security negotiation */
1971 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1973 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1976 memset(data->context, 0, sizeof(data->context));
1978 if (data->flags & NFS_MOUNT_VER3) {
1979 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1980 goto out_invalid_fh;
1981 mntfh->size = data->root.size;
1984 mntfh->size = NFS2_FHSIZE;
1989 memcpy(mntfh->data, data->root.data, mntfh->size);
1990 if (mntfh->size < sizeof(mntfh->data))
1991 memset(mntfh->data + mntfh->size, 0,
1992 sizeof(mntfh->data) - mntfh->size);
1995 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1998 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1999 args->flags |= extra_flags;
2000 args->rsize = data->rsize;
2001 args->wsize = data->wsize;
2002 args->timeo = data->timeo;
2003 args->retrans = data->retrans;
2004 args->acregmin = data->acregmin;
2005 args->acregmax = data->acregmax;
2006 args->acdirmin = data->acdirmin;
2007 args->acdirmax = data->acdirmax;
2008 args->need_mount = false;
2010 memcpy(sap, &data->addr, sizeof(data->addr));
2011 args->nfs_server.addrlen = sizeof(data->addr);
2012 args->nfs_server.port = ntohs(data->addr.sin_port);
2013 if (!nfs_verify_server_address(sap))
2014 goto out_no_address;
2016 if (!(data->flags & NFS_MOUNT_TCP))
2017 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2018 /* N.B. caller will free nfs_server.hostname in all cases */
2019 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
2020 args->namlen = data->namlen;
2021 args->bsize = data->bsize;
2023 if (data->flags & NFS_MOUNT_SECFLAVOUR)
2024 args->selected_flavor = data->pseudoflavor;
2026 args->selected_flavor = RPC_AUTH_UNIX;
2027 if (!args->nfs_server.hostname)
2030 if (!(data->flags & NFS_MOUNT_NONLM))
2031 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
2032 NFS_MOUNT_LOCAL_FCNTL);
2034 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
2035 NFS_MOUNT_LOCAL_FCNTL);
2037 * The legacy version 6 binary mount data from userspace has a
2038 * field used only to transport selinux information into the
2039 * the kernel. To continue to support that functionality we
2040 * have a touch of selinux knowledge here in the NFS code. The
2041 * userspace code converted context=blah to just blah so we are
2042 * converting back to the full string selinux understands.
2044 if (data->context[0]){
2045 #ifdef CONFIG_SECURITY_SELINUX
2047 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2050 strcpy(opts_str, "context=");
2051 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2052 strcat(opts_str, &data->context[0]);
2053 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2064 return NFS_TEXT_DATA;
2070 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2074 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2079 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2083 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2087 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2091 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2095 #if IS_ENABLED(CONFIG_NFS_V4)
2096 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2098 struct nfs_parsed_mount_data *args,
2099 struct nfs_fh *mntfh,
2100 const char *dev_name)
2102 if (fs_type == &nfs_fs_type)
2103 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2104 return nfs4_validate_mount_data(options, args, dev_name);
2107 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2109 struct nfs_parsed_mount_data *args,
2110 struct nfs_fh *mntfh,
2111 const char *dev_name)
2113 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2117 static int nfs_validate_text_mount_data(void *options,
2118 struct nfs_parsed_mount_data *args,
2119 const char *dev_name)
2122 int max_namelen = PAGE_SIZE;
2123 int max_pathlen = NFS_MAXPATHLEN;
2124 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2126 if (nfs_parse_mount_options((char *)options, args) == 0)
2129 if (!nfs_verify_server_address(sap))
2130 goto out_no_address;
2132 if (args->version == 4) {
2133 #if IS_ENABLED(CONFIG_NFS_V4)
2135 max_namelen = NFS4_MAXNAMLEN;
2136 max_pathlen = NFS4_MAXPATHLEN;
2137 nfs_validate_transport_protocol(args);
2138 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2139 goto out_invalid_transport_udp;
2140 nfs4_validate_mount_flags(args);
2142 goto out_v4_not_compiled;
2143 #endif /* CONFIG_NFS_V4 */
2145 nfs_set_mount_transport_protocol(args);
2147 nfs_set_port(sap, &args->nfs_server.port, port);
2149 return nfs_parse_devname(dev_name,
2150 &args->nfs_server.hostname,
2152 &args->nfs_server.export_path,
2155 #if !IS_ENABLED(CONFIG_NFS_V4)
2156 out_v4_not_compiled:
2157 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2158 return -EPROTONOSUPPORT;
2160 out_invalid_transport_udp:
2161 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2163 #endif /* !CONFIG_NFS_V4 */
2166 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2170 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2171 | NFS_MOUNT_SECURE \
2174 | NFS_MOUNT_KERBEROS \
2176 | NFS_MOUNT_BROKEN_SUID \
2177 | NFS_MOUNT_STRICTLOCK \
2178 | NFS_MOUNT_LEGACY_INTERFACE)
2180 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2181 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2184 nfs_compare_remount_data(struct nfs_server *nfss,
2185 struct nfs_parsed_mount_data *data)
2187 if ((data->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK ||
2188 data->rsize != nfss->rsize ||
2189 data->wsize != nfss->wsize ||
2190 data->version != nfss->nfs_client->rpc_ops->version ||
2191 data->minorversion != nfss->nfs_client->cl_minorversion ||
2192 data->retrans != nfss->client->cl_timeout->to_retries ||
2193 data->selected_flavor != nfss->client->cl_auth->au_flavor ||
2194 data->acregmin != nfss->acregmin / HZ ||
2195 data->acregmax != nfss->acregmax / HZ ||
2196 data->acdirmin != nfss->acdirmin / HZ ||
2197 data->acdirmax != nfss->acdirmax / HZ ||
2198 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2199 data->nfs_server.port != nfss->port ||
2200 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2201 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2202 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2209 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2212 struct nfs_server *nfss = sb->s_fs_info;
2213 struct nfs_parsed_mount_data *data;
2214 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2215 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2216 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2218 sync_filesystem(sb);
2221 * Userspace mount programs that send binary options generally send
2222 * them populated with default values. We have no way to know which
2223 * ones were explicitly specified. Fall back to legacy behavior and
2224 * just return success.
2226 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2227 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2228 options->version <= 6))))
2231 data = kzalloc(sizeof(*data), GFP_KERNEL);
2235 /* fill out struct with values from existing mount */
2236 data->flags = nfss->flags;
2237 data->rsize = nfss->rsize;
2238 data->wsize = nfss->wsize;
2239 data->retrans = nfss->client->cl_timeout->to_retries;
2240 data->selected_flavor = nfss->client->cl_auth->au_flavor;
2241 data->auth_info = nfss->auth_info;
2242 data->acregmin = nfss->acregmin / HZ;
2243 data->acregmax = nfss->acregmax / HZ;
2244 data->acdirmin = nfss->acdirmin / HZ;
2245 data->acdirmax = nfss->acdirmax / HZ;
2246 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2247 data->nfs_server.port = nfss->port;
2248 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2249 data->version = nfsvers;
2250 data->minorversion = nfss->nfs_client->cl_minorversion;
2251 data->net = current->nsproxy->net_ns;
2252 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2253 data->nfs_server.addrlen);
2255 /* overwrite those values with any that were specified */
2257 if (!nfs_parse_mount_options((char *)options, data))
2261 * noac is a special case. It implies -o sync, but that's not
2262 * necessarily reflected in the mtab options. do_remount_sb
2263 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2264 * remount options, so we have to explicitly reset it.
2266 if (data->flags & NFS_MOUNT_NOAC)
2267 *flags |= MS_SYNCHRONOUS;
2269 /* compare new mount options with old ones */
2270 error = nfs_compare_remount_data(nfss, data);
2275 EXPORT_SYMBOL_GPL(nfs_remount);
2278 * Initialise the common bits of the superblock
2280 inline void nfs_initialise_sb(struct super_block *sb)
2282 struct nfs_server *server = NFS_SB(sb);
2284 sb->s_magic = NFS_SUPER_MAGIC;
2286 /* We probably want something more informative here */
2287 snprintf(sb->s_id, sizeof(sb->s_id),
2288 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2290 if (sb->s_blocksize == 0)
2291 sb->s_blocksize = nfs_block_bits(server->wsize,
2292 &sb->s_blocksize_bits);
2294 sb->s_bdi = &server->backing_dev_info;
2296 nfs_super_set_maxbytes(sb, server->maxfilesize);
2300 * Finish setting up an NFS2/3 superblock
2302 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2304 struct nfs_parsed_mount_data *data = mount_info->parsed;
2305 struct nfs_server *server = NFS_SB(sb);
2307 sb->s_blocksize_bits = 0;
2308 sb->s_blocksize = 0;
2309 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2310 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2311 if (data && data->bsize)
2312 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2314 if (server->nfs_client->rpc_ops->version != 2) {
2315 /* The VFS shouldn't apply the umask to mode bits. We will do
2316 * so ourselves when necessary.
2318 sb->s_flags |= MS_POSIXACL;
2319 sb->s_time_gran = 1;
2322 nfs_initialise_sb(sb);
2324 EXPORT_SYMBOL_GPL(nfs_fill_super);
2327 * Finish setting up a cloned NFS2/3/4 superblock
2329 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2331 const struct super_block *old_sb = mount_info->cloned->sb;
2332 struct nfs_server *server = NFS_SB(sb);
2334 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2335 sb->s_blocksize = old_sb->s_blocksize;
2336 sb->s_maxbytes = old_sb->s_maxbytes;
2337 sb->s_xattr = old_sb->s_xattr;
2338 sb->s_op = old_sb->s_op;
2339 sb->s_time_gran = 1;
2341 if (server->nfs_client->rpc_ops->version != 2) {
2342 /* The VFS shouldn't apply the umask to mode bits. We will do
2343 * so ourselves when necessary.
2345 sb->s_flags |= MS_POSIXACL;
2348 nfs_initialise_sb(sb);
2351 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2353 const struct nfs_server *a = s->s_fs_info;
2354 const struct rpc_clnt *clnt_a = a->client;
2355 const struct rpc_clnt *clnt_b = b->client;
2357 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2359 if (a->nfs_client != b->nfs_client)
2361 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2363 if (a->wsize != b->wsize)
2365 if (a->rsize != b->rsize)
2367 if (a->acregmin != b->acregmin)
2369 if (a->acregmax != b->acregmax)
2371 if (a->acdirmin != b->acdirmin)
2373 if (a->acdirmax != b->acdirmax)
2375 if (b->auth_info.flavor_len > 0 &&
2376 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2383 struct nfs_sb_mountdata {
2384 struct nfs_server *server;
2388 static int nfs_set_super(struct super_block *s, void *data)
2390 struct nfs_sb_mountdata *sb_mntdata = data;
2391 struct nfs_server *server = sb_mntdata->server;
2394 s->s_flags = sb_mntdata->mntflags;
2395 s->s_fs_info = server;
2396 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2397 ret = set_anon_super(s, server);
2399 server->s_dev = s->s_dev;
2403 static int nfs_compare_super_address(struct nfs_server *server1,
2404 struct nfs_server *server2)
2406 struct sockaddr *sap1, *sap2;
2408 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2409 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2411 if (sap1->sa_family != sap2->sa_family)
2414 switch (sap1->sa_family) {
2416 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2417 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2418 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2420 if (sin1->sin_port != sin2->sin_port)
2425 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2426 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2427 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2429 if (sin1->sin6_port != sin2->sin6_port)
2440 static int nfs_compare_super(struct super_block *sb, void *data)
2442 struct nfs_sb_mountdata *sb_mntdata = data;
2443 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2444 int mntflags = sb_mntdata->mntflags;
2446 if (!nfs_compare_super_address(old, server))
2448 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2449 if (old->flags & NFS_MOUNT_UNSHARED)
2451 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2453 return nfs_compare_mount_options(sb, server, mntflags);
2456 #ifdef CONFIG_NFS_FSCACHE
2457 static void nfs_get_cache_cookie(struct super_block *sb,
2458 struct nfs_parsed_mount_data *parsed,
2459 struct nfs_clone_mount *cloned)
2461 struct nfs_server *nfss = NFS_SB(sb);
2465 nfss->fscache_key = NULL;
2466 nfss->fscache = NULL;
2469 if (!(parsed->options & NFS_OPTION_FSCACHE))
2471 if (parsed->fscache_uniq) {
2472 uniq = parsed->fscache_uniq;
2473 ulen = strlen(parsed->fscache_uniq);
2475 } else if (cloned) {
2476 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2477 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2479 if (mnt_s->fscache_key) {
2480 uniq = mnt_s->fscache_key->key.uniquifier;
2481 ulen = mnt_s->fscache_key->key.uniq_len;
2486 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2489 static void nfs_get_cache_cookie(struct super_block *sb,
2490 struct nfs_parsed_mount_data *parsed,
2491 struct nfs_clone_mount *cloned)
2496 static int nfs_bdi_register(struct nfs_server *server)
2498 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2501 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2502 struct nfs_mount_info *mount_info)
2505 unsigned long kflags = 0, kflags_out = 0;
2506 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2507 kflags |= SECURITY_LSM_NATIVE_LABELS;
2509 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2510 kflags, &kflags_out);
2514 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2515 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2516 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2520 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2522 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2523 struct nfs_mount_info *mount_info)
2525 /* clone any lsm security options from the parent to the new sb */
2526 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2528 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2530 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2532 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2533 int flags, const char *dev_name,
2534 struct nfs_mount_info *mount_info,
2535 struct nfs_subversion *nfs_mod)
2537 struct super_block *s;
2538 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2539 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2540 struct nfs_sb_mountdata sb_mntdata = {
2546 if (server->flags & NFS_MOUNT_UNSHARED)
2547 compare_super = NULL;
2549 /* -o noac implies -o sync */
2550 if (server->flags & NFS_MOUNT_NOAC)
2551 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2553 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2554 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2555 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2557 /* Get a superblock - note that we may end up sharing one that already exists */
2558 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2560 mntroot = ERR_CAST(s);
2564 if (s->s_fs_info != server) {
2565 nfs_free_server(server);
2568 error = nfs_bdi_register(server);
2570 mntroot = ERR_PTR(error);
2571 goto error_splat_super;
2577 /* initial superblock/root creation */
2578 mount_info->fill_super(s, mount_info);
2579 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2582 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2583 if (IS_ERR(mntroot))
2584 goto error_splat_super;
2586 error = mount_info->set_security(s, mntroot, mount_info);
2588 goto error_splat_root;
2590 s->s_flags |= MS_ACTIVE;
2596 nfs_free_server(server);
2601 mntroot = ERR_PTR(error);
2603 deactivate_locked_super(s);
2606 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2608 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2609 int flags, const char *dev_name, void *raw_data)
2611 struct nfs_mount_info mount_info = {
2612 .fill_super = nfs_fill_super,
2613 .set_security = nfs_set_sb_security,
2615 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2616 struct nfs_subversion *nfs_mod;
2619 mount_info.parsed = nfs_alloc_parsed_mount_data();
2620 mount_info.mntfh = nfs_alloc_fhandle();
2621 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2624 /* Validate the mount data */
2625 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2626 if (error == NFS_TEXT_DATA)
2627 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2629 mntroot = ERR_PTR(error);
2633 nfs_mod = get_nfs_version(mount_info.parsed->version);
2634 if (IS_ERR(nfs_mod)) {
2635 mntroot = ERR_CAST(nfs_mod);
2639 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2641 put_nfs_version(nfs_mod);
2643 nfs_free_parsed_mount_data(mount_info.parsed);
2644 nfs_free_fhandle(mount_info.mntfh);
2647 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2650 * Destroy an NFS2/3 superblock
2652 void nfs_kill_super(struct super_block *s)
2654 struct nfs_server *server = NFS_SB(s);
2655 dev_t dev = s->s_dev;
2657 generic_shutdown_super(s);
2659 nfs_fscache_release_super_cookie(s);
2661 nfs_free_server(server);
2662 free_anon_bdev(dev);
2664 EXPORT_SYMBOL_GPL(nfs_kill_super);
2667 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2669 static struct dentry *
2670 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2671 const char *dev_name, void *raw_data)
2673 struct nfs_clone_mount *data = raw_data;
2674 struct nfs_mount_info mount_info = {
2675 .fill_super = nfs_clone_super,
2676 .set_security = nfs_clone_sb_security,
2679 struct nfs_server *server;
2680 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2681 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2683 dprintk("--> nfs_xdev_mount()\n");
2685 mount_info.mntfh = mount_info.cloned->fh;
2687 /* create a new volume representation */
2688 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2691 mntroot = ERR_CAST(server);
2693 mntroot = nfs_fs_mount_common(server, flags,
2694 dev_name, &mount_info, nfs_mod);
2696 dprintk("<-- nfs_xdev_mount() = %ld\n",
2697 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2701 #if IS_ENABLED(CONFIG_NFS_V4)
2703 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2705 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2706 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2710 * Validate NFSv4 mount options
2712 static int nfs4_validate_mount_data(void *options,
2713 struct nfs_parsed_mount_data *args,
2714 const char *dev_name)
2716 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2717 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2725 switch (data->version) {
2727 if (data->host_addrlen > sizeof(args->nfs_server.address))
2728 goto out_no_address;
2729 if (data->host_addrlen == 0)
2730 goto out_no_address;
2731 args->nfs_server.addrlen = data->host_addrlen;
2732 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2734 if (!nfs_verify_server_address(sap))
2735 goto out_no_address;
2736 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2738 if (data->auth_flavourlen) {
2739 rpc_authflavor_t pseudoflavor;
2740 if (data->auth_flavourlen > 1)
2741 goto out_inval_auth;
2742 if (copy_from_user(&pseudoflavor,
2743 data->auth_flavours,
2744 sizeof(pseudoflavor)))
2746 args->selected_flavor = pseudoflavor;
2748 args->selected_flavor = RPC_AUTH_UNIX;
2750 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2753 args->nfs_server.hostname = c;
2755 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2758 args->nfs_server.export_path = c;
2759 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2761 c = strndup_user(data->client_addr.data, 16);
2764 args->client_address = c;
2767 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2771 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2772 args->rsize = data->rsize;
2773 args->wsize = data->wsize;
2774 args->timeo = data->timeo;
2775 args->retrans = data->retrans;
2776 args->acregmin = data->acregmin;
2777 args->acregmax = data->acregmax;
2778 args->acdirmin = data->acdirmin;
2779 args->acdirmax = data->acdirmax;
2780 args->nfs_server.protocol = data->proto;
2781 nfs_validate_transport_protocol(args);
2782 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2783 goto out_invalid_transport_udp;
2787 return NFS_TEXT_DATA;
2793 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2797 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2798 data->auth_flavourlen);
2802 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2805 out_invalid_transport_udp:
2806 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2811 * NFS v4 module parameters need to stay in the
2812 * NFS client for backwards compatibility
2814 unsigned int nfs_callback_set_tcpport;
2815 unsigned short nfs_callback_tcpport;
2816 /* Default cache timeout is 10 minutes */
2817 unsigned int nfs_idmap_cache_timeout = 600;
2818 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2819 bool nfs4_disable_idmapping = true;
2820 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2821 unsigned short send_implementation_id = 1;
2822 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2823 bool recover_lost_locks = false;
2825 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2826 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2827 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2828 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2829 EXPORT_SYMBOL_GPL(max_session_slots);
2830 EXPORT_SYMBOL_GPL(send_implementation_id);
2831 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2832 EXPORT_SYMBOL_GPL(recover_lost_locks);
2834 #define NFS_CALLBACK_MAXPORTNR (65535U)
2836 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2843 ret = kstrtoul(val, 0, &num);
2844 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2846 *((unsigned int *)kp->arg) = num;
2849 static struct kernel_param_ops param_ops_portnr = {
2850 .set = param_set_portnr,
2851 .get = param_get_uint,
2853 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2855 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2856 module_param(nfs_idmap_cache_timeout, int, 0644);
2857 module_param(nfs4_disable_idmapping, bool, 0644);
2858 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2859 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2860 MODULE_PARM_DESC(nfs4_disable_idmapping,
2861 "Turn off NFSv4 idmapping when using 'sec=sys'");
2862 module_param(max_session_slots, ushort, 0644);
2863 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2864 "requests the client will negotiate");
2865 module_param(send_implementation_id, ushort, 0644);
2866 MODULE_PARM_DESC(send_implementation_id,
2867 "Send implementation ID with NFSv4.1 exchange_id");
2868 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2870 module_param(recover_lost_locks, bool, 0644);
2871 MODULE_PARM_DESC(recover_lost_locks,
2872 "If the server reports that a lock might be lost, "
2873 "try to recover it risking data corruption.");
2876 #endif /* CONFIG_NFS_V4 */