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 .put_super = nfs_put_super,
315 .statfs = nfs_statfs,
316 .evict_inode = nfs_evict_inode,
317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
321 .show_stats = nfs_show_stats,
322 .remount_fs = nfs_remount,
324 EXPORT_SYMBOL_GPL(nfs_sops);
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);
331 struct file_system_type nfs4_fs_type = {
332 .owner = THIS_MODULE,
334 .mount = nfs_fs_mount,
335 .kill_sb = nfs_kill_super,
336 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA,
338 MODULE_ALIAS_FS("nfs4");
339 MODULE_ALIAS("nfs4");
340 EXPORT_SYMBOL_GPL(nfs4_fs_type);
342 static int __init register_nfs4_fs(void)
344 return register_filesystem(&nfs4_fs_type);
347 static void unregister_nfs4_fs(void)
349 unregister_filesystem(&nfs4_fs_type);
352 static int __init register_nfs4_fs(void)
357 static void unregister_nfs4_fs(void)
362 static struct shrinker acl_shrinker = {
363 .count_objects = nfs_access_cache_count,
364 .scan_objects = nfs_access_cache_scan,
365 .seeks = DEFAULT_SEEKS,
369 * Register the NFS filesystems
371 int __init register_nfs_fs(void)
375 ret = register_filesystem(&nfs_fs_type);
379 ret = register_nfs4_fs();
383 ret = nfs_register_sysctl();
386 register_shrinker(&acl_shrinker);
390 unregister_nfs4_fs();
392 unregister_filesystem(&nfs_fs_type);
398 * Unregister the NFS filesystems
400 void __exit unregister_nfs_fs(void)
402 unregister_shrinker(&acl_shrinker);
403 nfs_unregister_sysctl();
404 unregister_nfs4_fs();
405 unregister_filesystem(&nfs_fs_type);
408 void nfs_sb_active(struct super_block *sb)
410 struct nfs_server *server = NFS_SB(sb);
412 if (atomic_inc_return(&server->active) == 1)
413 atomic_inc(&sb->s_active);
415 EXPORT_SYMBOL_GPL(nfs_sb_active);
417 void nfs_sb_deactive(struct super_block *sb)
419 struct nfs_server *server = NFS_SB(sb);
421 if (atomic_dec_and_test(&server->active))
422 deactivate_super(sb);
424 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
427 * Deliver file system statistics to userspace
429 int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
431 struct nfs_server *server = NFS_SB(dentry->d_sb);
432 unsigned char blockbits;
433 unsigned long blockres;
434 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
435 struct nfs_fsstat res;
438 res.fattr = nfs_alloc_fattr();
439 if (res.fattr == NULL)
442 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
443 if (unlikely(error == -ESTALE)) {
444 struct dentry *pd_dentry;
446 pd_dentry = dget_parent(dentry);
447 if (pd_dentry != NULL) {
448 nfs_zap_caches(pd_dentry->d_inode);
452 nfs_free_fattr(res.fattr);
456 buf->f_type = NFS_SUPER_MAGIC;
459 * Current versions of glibc do not correctly handle the
460 * case where f_frsize != f_bsize. Eventually we want to
461 * report the value of wtmult in this field.
463 buf->f_frsize = dentry->d_sb->s_blocksize;
466 * On most *nix systems, f_blocks, f_bfree, and f_bavail
467 * are reported in units of f_frsize. Linux hasn't had
468 * an f_frsize field in its statfs struct until recently,
469 * thus historically Linux's sys_statfs reports these
470 * fields in units of f_bsize.
472 buf->f_bsize = dentry->d_sb->s_blocksize;
473 blockbits = dentry->d_sb->s_blocksize_bits;
474 blockres = (1 << blockbits) - 1;
475 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
476 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
477 buf->f_bavail = (res.abytes + blockres) >> blockbits;
479 buf->f_files = res.tfiles;
480 buf->f_ffree = res.afiles;
482 buf->f_namelen = server->namelen;
487 dprintk("%s: statfs error = %d\n", __func__, -error);
490 EXPORT_SYMBOL_GPL(nfs_statfs);
493 * Map the security flavour number to a name
495 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
497 static const struct {
498 rpc_authflavor_t flavour;
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->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
927 data->auth_flavor_len = 0;
928 data->minorversion = 0;
929 data->need_mount = true;
930 data->net = current->nsproxy->net_ns;
931 security_init_mnt_opts(&data->lsm_opts);
936 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
939 kfree(data->client_address);
940 kfree(data->mount_server.hostname);
941 kfree(data->nfs_server.export_path);
942 kfree(data->nfs_server.hostname);
943 kfree(data->fscache_uniq);
944 security_free_mnt_opts(&data->lsm_opts);
950 * Sanity-check a server address provided by the mount command.
952 * Address family must be initialized, and address must not be
953 * the ANY address for that family.
955 static int nfs_verify_server_address(struct sockaddr *addr)
957 switch (addr->sa_family) {
959 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
960 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
963 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
964 return !ipv6_addr_any(sa);
968 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
973 * Select between a default port value and a user-specified port value.
974 * If a zero value is set, then autobind will be used.
976 static void nfs_set_port(struct sockaddr *sap, int *port,
977 const unsigned short default_port)
979 if (*port == NFS_UNSPEC_PORT)
980 *port = default_port;
982 rpc_set_port(sap, *port);
986 * Sanity check the NFS transport protocol.
989 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
991 switch (mnt->nfs_server.protocol) {
992 case XPRT_TRANSPORT_UDP:
993 case XPRT_TRANSPORT_TCP:
994 case XPRT_TRANSPORT_RDMA:
997 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1002 * For text based NFSv2/v3 mounts, the mount protocol transport default
1003 * settings should depend upon the specified NFS transport.
1005 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1007 nfs_validate_transport_protocol(mnt);
1009 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1010 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1012 switch (mnt->nfs_server.protocol) {
1013 case XPRT_TRANSPORT_UDP:
1014 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1016 case XPRT_TRANSPORT_TCP:
1017 case XPRT_TRANSPORT_RDMA:
1018 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1022 static void nfs_set_auth_parsed_mount_data(struct nfs_parsed_mount_data *data,
1023 rpc_authflavor_t pseudoflavor)
1025 data->auth_flavors[0] = pseudoflavor;
1026 data->auth_flavor_len = 1;
1030 * Parse the value of the 'sec=' option.
1032 static int nfs_parse_security_flavors(char *value,
1033 struct nfs_parsed_mount_data *mnt)
1035 substring_t args[MAX_OPT_ARGS];
1036 rpc_authflavor_t pseudoflavor;
1038 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1040 switch (match_token(value, nfs_secflavor_tokens, args)) {
1042 pseudoflavor = RPC_AUTH_NULL;
1045 pseudoflavor = RPC_AUTH_UNIX;
1048 pseudoflavor = RPC_AUTH_GSS_KRB5;
1051 pseudoflavor = RPC_AUTH_GSS_KRB5I;
1054 pseudoflavor = RPC_AUTH_GSS_KRB5P;
1057 pseudoflavor = RPC_AUTH_GSS_LKEY;
1060 pseudoflavor = RPC_AUTH_GSS_LKEYI;
1063 pseudoflavor = RPC_AUTH_GSS_LKEYP;
1066 pseudoflavor = RPC_AUTH_GSS_SPKM;
1069 pseudoflavor = RPC_AUTH_GSS_SPKMI;
1072 pseudoflavor = RPC_AUTH_GSS_SPKMP;
1078 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1079 nfs_set_auth_parsed_mount_data(mnt, pseudoflavor);
1083 static int nfs_parse_version_string(char *string,
1084 struct nfs_parsed_mount_data *mnt,
1087 mnt->flags &= ~NFS_MOUNT_VER3;
1088 switch (match_token(string, nfs_vers_tokens, args)) {
1093 mnt->flags |= NFS_MOUNT_VER3;
1097 /* Backward compatibility option. In future,
1098 * the mount program should always supply
1099 * a NFSv4 minor version number.
1105 mnt->minorversion = 0;
1109 mnt->minorversion = 1;
1113 mnt->minorversion = 2;
1121 static int nfs_get_option_str(substring_t args[], char **option)
1124 *option = match_strdup(args);
1128 static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1133 string = match_strdup(args);
1136 rc = kstrtoul(string, 10, option);
1143 * Error-check and convert a string of mount options from user space into
1144 * a data structure. The whole mount string is processed; bad options are
1145 * skipped as they are encountered. If there were no errors, return 1;
1146 * otherwise return 0 (zero).
1148 static int nfs_parse_mount_options(char *raw,
1149 struct nfs_parsed_mount_data *mnt)
1151 char *p, *string, *secdata;
1152 int rc, sloppy = 0, invalid_option = 0;
1153 unsigned short protofamily = AF_UNSPEC;
1154 unsigned short mountfamily = AF_UNSPEC;
1157 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1160 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1162 secdata = alloc_secdata();
1166 rc = security_sb_copy_data(raw, secdata);
1168 goto out_security_failure;
1170 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1172 goto out_security_failure;
1174 free_secdata(secdata);
1176 while ((p = strsep(&raw, ",")) != NULL) {
1177 substring_t args[MAX_OPT_ARGS];
1178 unsigned long option;
1184 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1186 token = match_token(p, nfs_mount_option_tokens, args);
1190 * boolean options: foo/nofoo
1193 mnt->flags |= NFS_MOUNT_SOFT;
1196 mnt->flags &= ~NFS_MOUNT_SOFT;
1199 mnt->flags |= NFS_MOUNT_POSIX;
1202 mnt->flags &= ~NFS_MOUNT_POSIX;
1205 mnt->flags &= ~NFS_MOUNT_NOCTO;
1208 mnt->flags |= NFS_MOUNT_NOCTO;
1211 mnt->flags &= ~NFS_MOUNT_NOAC;
1214 mnt->flags |= NFS_MOUNT_NOAC;
1217 mnt->flags &= ~NFS_MOUNT_NONLM;
1218 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1219 NFS_MOUNT_LOCAL_FCNTL);
1222 mnt->flags |= NFS_MOUNT_NONLM;
1223 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1224 NFS_MOUNT_LOCAL_FCNTL);
1227 mnt->flags &= ~NFS_MOUNT_TCP;
1228 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1231 mnt->flags |= NFS_MOUNT_TCP;
1232 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1235 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1236 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1237 xprt_load_transport(p);
1240 mnt->flags &= ~NFS_MOUNT_NOACL;
1243 mnt->flags |= NFS_MOUNT_NOACL;
1246 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1248 case Opt_nordirplus:
1249 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1251 case Opt_sharecache:
1252 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1254 case Opt_nosharecache:
1255 mnt->flags |= NFS_MOUNT_UNSHARED;
1258 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1260 case Opt_noresvport:
1261 mnt->flags |= NFS_MOUNT_NORESVPORT;
1264 mnt->options |= NFS_OPTION_FSCACHE;
1265 kfree(mnt->fscache_uniq);
1266 mnt->fscache_uniq = NULL;
1269 mnt->options &= ~NFS_OPTION_FSCACHE;
1270 kfree(mnt->fscache_uniq);
1271 mnt->fscache_uniq = NULL;
1274 mnt->options |= NFS_OPTION_MIGRATION;
1276 case Opt_nomigration:
1277 mnt->options &= NFS_OPTION_MIGRATION;
1281 * options that take numeric values
1284 if (nfs_get_option_ul(args, &option) ||
1286 goto out_invalid_value;
1287 mnt->nfs_server.port = option;
1290 if (nfs_get_option_ul(args, &option))
1291 goto out_invalid_value;
1292 mnt->rsize = option;
1295 if (nfs_get_option_ul(args, &option))
1296 goto out_invalid_value;
1297 mnt->wsize = option;
1300 if (nfs_get_option_ul(args, &option))
1301 goto out_invalid_value;
1302 mnt->bsize = option;
1305 if (nfs_get_option_ul(args, &option) || option == 0)
1306 goto out_invalid_value;
1307 mnt->timeo = option;
1310 if (nfs_get_option_ul(args, &option) || option == 0)
1311 goto out_invalid_value;
1312 mnt->retrans = option;
1315 if (nfs_get_option_ul(args, &option))
1316 goto out_invalid_value;
1317 mnt->acregmin = option;
1320 if (nfs_get_option_ul(args, &option))
1321 goto out_invalid_value;
1322 mnt->acregmax = option;
1325 if (nfs_get_option_ul(args, &option))
1326 goto out_invalid_value;
1327 mnt->acdirmin = option;
1330 if (nfs_get_option_ul(args, &option))
1331 goto out_invalid_value;
1332 mnt->acdirmax = option;
1335 if (nfs_get_option_ul(args, &option))
1336 goto out_invalid_value;
1337 mnt->acregmin = mnt->acregmax =
1338 mnt->acdirmin = mnt->acdirmax = option;
1341 if (nfs_get_option_ul(args, &option))
1342 goto out_invalid_value;
1343 mnt->namlen = option;
1346 if (nfs_get_option_ul(args, &option) ||
1348 goto out_invalid_value;
1349 mnt->mount_server.port = option;
1352 if (nfs_get_option_ul(args, &option) ||
1353 option < NFS_MNT_VERSION ||
1354 option > NFS_MNT3_VERSION)
1355 goto out_invalid_value;
1356 mnt->mount_server.version = option;
1358 case Opt_minorversion:
1359 if (nfs_get_option_ul(args, &option))
1360 goto out_invalid_value;
1361 if (option > NFS4_MAX_MINOR_VERSION)
1362 goto out_invalid_value;
1363 mnt->minorversion = option;
1367 * options that take text values
1370 string = match_strdup(args);
1373 rc = nfs_parse_version_string(string, mnt, args);
1376 goto out_invalid_value;
1379 string = match_strdup(args);
1382 rc = nfs_parse_security_flavors(string, mnt);
1385 dfprintk(MOUNT, "NFS: unrecognized "
1386 "security flavor\n");
1391 string = match_strdup(args);
1394 token = match_token(string,
1395 nfs_xprt_protocol_tokens, args);
1397 protofamily = AF_INET;
1400 protofamily = AF_INET6;
1402 mnt->flags &= ~NFS_MOUNT_TCP;
1403 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1406 protofamily = AF_INET6;
1408 mnt->flags |= NFS_MOUNT_TCP;
1409 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1412 /* vector side protocols to TCP */
1413 mnt->flags |= NFS_MOUNT_TCP;
1414 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1415 xprt_load_transport(string);
1418 dfprintk(MOUNT, "NFS: unrecognized "
1419 "transport protocol\n");
1425 case Opt_mountproto:
1426 string = match_strdup(args);
1429 token = match_token(string,
1430 nfs_xprt_protocol_tokens, args);
1433 mountfamily = AF_INET;
1436 mountfamily = AF_INET6;
1438 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1441 mountfamily = AF_INET6;
1443 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1445 case Opt_xprt_rdma: /* not used for side protocols */
1447 dfprintk(MOUNT, "NFS: unrecognized "
1448 "transport protocol\n");
1453 string = match_strdup(args);
1456 mnt->nfs_server.addrlen =
1457 rpc_pton(mnt->net, string, strlen(string),
1459 &mnt->nfs_server.address,
1460 sizeof(mnt->nfs_server.address));
1462 if (mnt->nfs_server.addrlen == 0)
1463 goto out_invalid_address;
1465 case Opt_clientaddr:
1466 if (nfs_get_option_str(args, &mnt->client_address))
1470 if (nfs_get_option_str(args,
1471 &mnt->mount_server.hostname))
1475 string = match_strdup(args);
1478 mnt->mount_server.addrlen =
1479 rpc_pton(mnt->net, string, strlen(string),
1481 &mnt->mount_server.address,
1482 sizeof(mnt->mount_server.address));
1484 if (mnt->mount_server.addrlen == 0)
1485 goto out_invalid_address;
1487 case Opt_lookupcache:
1488 string = match_strdup(args);
1491 token = match_token(string,
1492 nfs_lookupcache_tokens, args);
1495 case Opt_lookupcache_all:
1496 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1498 case Opt_lookupcache_positive:
1499 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1500 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1502 case Opt_lookupcache_none:
1503 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1506 dfprintk(MOUNT, "NFS: invalid "
1507 "lookupcache argument\n");
1511 case Opt_fscache_uniq:
1512 if (nfs_get_option_str(args, &mnt->fscache_uniq))
1514 mnt->options |= NFS_OPTION_FSCACHE;
1516 case Opt_local_lock:
1517 string = match_strdup(args);
1520 token = match_token(string, nfs_local_lock_tokens,
1524 case Opt_local_lock_all:
1525 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1526 NFS_MOUNT_LOCAL_FCNTL);
1528 case Opt_local_lock_flock:
1529 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1531 case Opt_local_lock_posix:
1532 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1534 case Opt_local_lock_none:
1535 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1536 NFS_MOUNT_LOCAL_FCNTL);
1539 dfprintk(MOUNT, "NFS: invalid "
1540 "local_lock argument\n");
1550 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1553 case Opt_deprecated:
1554 dfprintk(MOUNT, "NFS: ignoring mount option "
1560 dfprintk(MOUNT, "NFS: unrecognized mount option "
1565 if (!sloppy && invalid_option)
1568 if (mnt->minorversion && mnt->version != 4)
1569 goto out_minorversion_mismatch;
1571 if (mnt->options & NFS_OPTION_MIGRATION &&
1572 mnt->version != 4 && mnt->minorversion != 0)
1573 goto out_migration_misuse;
1576 * verify that any proto=/mountproto= options match the address
1577 * families in the addr=/mountaddr= options.
1579 if (protofamily != AF_UNSPEC &&
1580 protofamily != mnt->nfs_server.address.ss_family)
1581 goto out_proto_mismatch;
1583 if (mountfamily != AF_UNSPEC) {
1584 if (mnt->mount_server.addrlen) {
1585 if (mountfamily != mnt->mount_server.address.ss_family)
1586 goto out_mountproto_mismatch;
1588 if (mountfamily != mnt->nfs_server.address.ss_family)
1589 goto out_mountproto_mismatch;
1595 out_mountproto_mismatch:
1596 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1600 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1602 out_invalid_address:
1603 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1606 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
1608 out_minorversion_mismatch:
1609 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1610 "minorversion=%u\n", mnt->version, mnt->minorversion);
1612 out_migration_misuse:
1614 "NFS: 'migration' not supported for this NFS version\n");
1617 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1619 out_security_failure:
1620 free_secdata(secdata);
1621 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1626 * Ensure that the specified authtype in args->auth_flavors[0] is supported by
1627 * the server. Returns 0 if it's ok, and -EACCES if not.
1629 static int nfs_verify_authflavor(struct nfs_parsed_mount_data *args,
1630 rpc_authflavor_t *server_authlist, unsigned int count)
1635 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1636 * must be in the list returned by the server.
1638 * AUTH_NULL has a special meaning when it's in the server list - it
1639 * means that the server will ignore the rpc creds, so any flavor
1642 for (i = 0; i < count; i++) {
1643 if (args->auth_flavors[0] == server_authlist[i] ||
1644 server_authlist[i] == RPC_AUTH_NULL)
1648 dfprintk(MOUNT, "NFS: auth flavor %u not supported by server\n",
1649 args->auth_flavors[0]);
1653 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1658 * Use the remote server's MOUNT service to request the NFS file handle
1659 * corresponding to the provided path.
1661 static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1662 struct nfs_fh *root_fh,
1663 rpc_authflavor_t *server_authlist,
1664 unsigned int *server_authlist_len)
1666 struct nfs_mount_request request = {
1667 .sap = (struct sockaddr *)
1668 &args->mount_server.address,
1669 .dirpath = args->nfs_server.export_path,
1670 .protocol = args->mount_server.protocol,
1672 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
1673 .auth_flav_len = server_authlist_len,
1674 .auth_flavs = server_authlist,
1679 if (args->mount_server.version == 0) {
1680 switch (args->version) {
1682 args->mount_server.version = NFS_MNT3_VERSION;
1685 args->mount_server.version = NFS_MNT_VERSION;
1688 request.version = args->mount_server.version;
1690 if (args->mount_server.hostname)
1691 request.hostname = args->mount_server.hostname;
1693 request.hostname = args->nfs_server.hostname;
1696 * Construct the mount server's address.
1698 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1699 memcpy(request.sap, &args->nfs_server.address,
1700 args->nfs_server.addrlen);
1701 args->mount_server.addrlen = args->nfs_server.addrlen;
1703 request.salen = args->mount_server.addrlen;
1704 nfs_set_port(request.sap, &args->mount_server.port, 0);
1707 * Now ask the mount server to map our export path
1710 status = nfs_mount(&request);
1712 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1713 request.hostname, status);
1720 static struct nfs_server *nfs_try_mount_request(struct nfs_mount_info *mount_info,
1721 struct nfs_subversion *nfs_mod)
1725 bool tried_auth_unix = false;
1726 bool auth_null_in_list = false;
1727 struct nfs_server *server = ERR_PTR(-EACCES);
1728 struct nfs_parsed_mount_data *args = mount_info->parsed;
1729 rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS];
1730 unsigned int authlist_len = ARRAY_SIZE(authlist);
1732 status = nfs_request_mount(args, mount_info->mntfh, authlist,
1735 return ERR_PTR(status);
1738 * Was a sec= authflavor specified in the options? First, verify
1739 * whether the server supports it, and then just try to use it if so.
1741 if (args->auth_flavor_len > 0) {
1742 status = nfs_verify_authflavor(args, authlist, authlist_len);
1743 dfprintk(MOUNT, "NFS: using auth flavor %u\n", args->auth_flavors[0]);
1745 return ERR_PTR(status);
1746 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1750 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1751 * SHOULD prefer the flavor listed first. However, some servers list
1752 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1754 for (i = 0; i < authlist_len; ++i) {
1755 rpc_authflavor_t flavor;
1756 struct rpcsec_gss_info info;
1758 flavor = authlist[i];
1761 tried_auth_unix = true;
1764 auth_null_in_list = true;
1767 if (rpcauth_get_gssinfo(flavor, &info) != 0)
1771 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor);
1772 nfs_set_auth_parsed_mount_data(args, flavor);
1773 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1774 if (!IS_ERR(server))
1779 * Nothing we tried so far worked. At this point, give up if we've
1780 * already tried AUTH_UNIX or if the server's list doesn't contain
1783 if (tried_auth_unix || !auth_null_in_list)
1786 /* Last chance! Try AUTH_UNIX */
1787 dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX);
1788 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
1789 return nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1792 struct dentry *nfs_try_mount(int flags, const char *dev_name,
1793 struct nfs_mount_info *mount_info,
1794 struct nfs_subversion *nfs_mod)
1796 struct nfs_server *server;
1798 if (mount_info->parsed->need_mount)
1799 server = nfs_try_mount_request(mount_info, nfs_mod);
1801 server = nfs_mod->rpc_ops->create_server(mount_info, nfs_mod);
1804 return ERR_CAST(server);
1806 return nfs_fs_mount_common(server, flags, dev_name, mount_info, nfs_mod);
1808 EXPORT_SYMBOL_GPL(nfs_try_mount);
1811 * Split "dev_name" into "hostname:export_path".
1813 * The leftmost colon demarks the split between the server's hostname
1814 * and the export path. If the hostname starts with a left square
1815 * bracket, then it may contain colons.
1817 * Note: caller frees hostname and export path, even on error.
1819 static int nfs_parse_devname(const char *dev_name,
1820 char **hostname, size_t maxnamlen,
1821 char **export_path, size_t maxpathlen)
1826 /* Is the host name protected with square brakcets? */
1827 if (*dev_name == '[') {
1828 end = strchr(++dev_name, ']');
1829 if (end == NULL || end[1] != ':')
1830 goto out_bad_devname;
1832 len = end - dev_name;
1837 end = strchr(dev_name, ':');
1839 goto out_bad_devname;
1840 len = end - dev_name;
1842 /* kill possible hostname list: not supported */
1843 comma = strchr(dev_name, ',');
1844 if (comma != NULL && comma < end)
1848 if (len > maxnamlen)
1851 /* N.B. caller will free nfs_server.hostname in all cases */
1852 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1853 if (*hostname == NULL)
1855 len = strlen(++end);
1856 if (len > maxpathlen)
1858 *export_path = kstrndup(end, len, GFP_KERNEL);
1862 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1866 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1870 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1874 dfprintk(MOUNT, "NFS: server hostname too long\n");
1875 return -ENAMETOOLONG;
1878 dfprintk(MOUNT, "NFS: export pathname too long\n");
1879 return -ENAMETOOLONG;
1883 * Validate the NFS2/NFS3 mount data
1884 * - fills in the mount root filehandle
1886 * For option strings, user space handles the following behaviors:
1888 * + DNS: mapping server host name to IP address ("addr=" option)
1890 * + failure mode: how to behave if a mount request can't be handled
1891 * immediately ("fg/bg" option)
1893 * + retry: how often to retry a mount request ("retry=" option)
1895 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1896 * mountproto=tcp after mountproto=udp, and so on
1898 static int nfs23_validate_mount_data(void *options,
1899 struct nfs_parsed_mount_data *args,
1900 struct nfs_fh *mntfh,
1901 const char *dev_name)
1903 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1904 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
1905 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE;
1910 args->version = NFS_DEFAULT_VERSION;
1911 switch (data->version) {
1917 if (data->flags & NFS_MOUNT_VER3)
1919 data->root.size = NFS2_FHSIZE;
1920 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1921 /* Turn off security negotiation */
1922 extra_flags |= NFS_MOUNT_SECFLAVOUR;
1924 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1927 memset(data->context, 0, sizeof(data->context));
1929 if (data->flags & NFS_MOUNT_VER3) {
1930 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1931 goto out_invalid_fh;
1932 mntfh->size = data->root.size;
1935 mntfh->size = NFS2_FHSIZE;
1940 memcpy(mntfh->data, data->root.data, mntfh->size);
1941 if (mntfh->size < sizeof(mntfh->data))
1942 memset(mntfh->data + mntfh->size, 0,
1943 sizeof(mntfh->data) - mntfh->size);
1946 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1949 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
1950 args->flags |= extra_flags;
1951 args->rsize = data->rsize;
1952 args->wsize = data->wsize;
1953 args->timeo = data->timeo;
1954 args->retrans = data->retrans;
1955 args->acregmin = data->acregmin;
1956 args->acregmax = data->acregmax;
1957 args->acdirmin = data->acdirmin;
1958 args->acdirmax = data->acdirmax;
1959 args->need_mount = false;
1961 memcpy(sap, &data->addr, sizeof(data->addr));
1962 args->nfs_server.addrlen = sizeof(data->addr);
1963 args->nfs_server.port = ntohs(data->addr.sin_port);
1964 if (!nfs_verify_server_address(sap))
1965 goto out_no_address;
1967 if (!(data->flags & NFS_MOUNT_TCP))
1968 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1969 /* N.B. caller will free nfs_server.hostname in all cases */
1970 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1971 args->namlen = data->namlen;
1972 args->bsize = data->bsize;
1974 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1975 nfs_set_auth_parsed_mount_data(args, data->pseudoflavor);
1977 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
1978 if (!args->nfs_server.hostname)
1981 if (!(data->flags & NFS_MOUNT_NONLM))
1982 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1983 NFS_MOUNT_LOCAL_FCNTL);
1985 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1986 NFS_MOUNT_LOCAL_FCNTL);
1988 * The legacy version 6 binary mount data from userspace has a
1989 * field used only to transport selinux information into the
1990 * the kernel. To continue to support that functionality we
1991 * have a touch of selinux knowledge here in the NFS code. The
1992 * userspace code converted context=blah to just blah so we are
1993 * converting back to the full string selinux understands.
1995 if (data->context[0]){
1996 #ifdef CONFIG_SECURITY_SELINUX
1998 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
2001 strcpy(opts_str, "context=");
2002 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
2003 strcat(opts_str, &data->context[0]);
2004 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
2015 return NFS_TEXT_DATA;
2018 #if !IS_ENABLED(CONFIG_NFS_V3)
2019 if (args->version == 3)
2020 goto out_v3_not_compiled;
2021 #endif /* !CONFIG_NFS_V3 */
2026 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2030 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2035 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2038 #if !IS_ENABLED(CONFIG_NFS_V3)
2039 out_v3_not_compiled:
2040 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2041 return -EPROTONOSUPPORT;
2042 #endif /* !CONFIG_NFS_V3 */
2045 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2049 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2053 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2057 #if IS_ENABLED(CONFIG_NFS_V4)
2058 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2060 struct nfs_parsed_mount_data *args,
2061 struct nfs_fh *mntfh,
2062 const char *dev_name)
2064 if (fs_type == &nfs_fs_type)
2065 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2066 return nfs4_validate_mount_data(options, args, dev_name);
2069 static int nfs_validate_mount_data(struct file_system_type *fs_type,
2071 struct nfs_parsed_mount_data *args,
2072 struct nfs_fh *mntfh,
2073 const char *dev_name)
2075 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2079 static int nfs_validate_text_mount_data(void *options,
2080 struct nfs_parsed_mount_data *args,
2081 const char *dev_name)
2084 int max_namelen = PAGE_SIZE;
2085 int max_pathlen = NFS_MAXPATHLEN;
2086 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2088 if (nfs_parse_mount_options((char *)options, args) == 0)
2091 if (!nfs_verify_server_address(sap))
2092 goto out_no_address;
2094 if (args->version == 4) {
2095 #if IS_ENABLED(CONFIG_NFS_V4)
2097 max_namelen = NFS4_MAXNAMLEN;
2098 max_pathlen = NFS4_MAXPATHLEN;
2099 nfs_validate_transport_protocol(args);
2100 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2101 goto out_invalid_transport_udp;
2102 nfs4_validate_mount_flags(args);
2104 goto out_v4_not_compiled;
2105 #endif /* CONFIG_NFS_V4 */
2107 nfs_set_mount_transport_protocol(args);
2109 nfs_set_port(sap, &args->nfs_server.port, port);
2111 if (args->auth_flavor_len > 1)
2114 return nfs_parse_devname(dev_name,
2115 &args->nfs_server.hostname,
2117 &args->nfs_server.export_path,
2120 #if !IS_ENABLED(CONFIG_NFS_V4)
2121 out_v4_not_compiled:
2122 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2123 return -EPROTONOSUPPORT;
2125 out_invalid_transport_udp:
2126 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2128 #endif /* !CONFIG_NFS_V4 */
2131 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2135 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2140 nfs_compare_remount_data(struct nfs_server *nfss,
2141 struct nfs_parsed_mount_data *data)
2143 if (data->flags != nfss->flags ||
2144 data->rsize != nfss->rsize ||
2145 data->wsize != nfss->wsize ||
2146 data->version != nfss->nfs_client->rpc_ops->version ||
2147 data->minorversion != nfss->nfs_client->cl_minorversion ||
2148 data->retrans != nfss->client->cl_timeout->to_retries ||
2149 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2150 data->acregmin != nfss->acregmin / HZ ||
2151 data->acregmax != nfss->acregmax / HZ ||
2152 data->acdirmin != nfss->acdirmin / HZ ||
2153 data->acdirmax != nfss->acdirmax / HZ ||
2154 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
2155 data->nfs_server.port != nfss->port ||
2156 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
2157 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2158 (struct sockaddr *)&nfss->nfs_client->cl_addr))
2165 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2168 struct nfs_server *nfss = sb->s_fs_info;
2169 struct nfs_parsed_mount_data *data;
2170 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2171 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
2172 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
2175 * Userspace mount programs that send binary options generally send
2176 * them populated with default values. We have no way to know which
2177 * ones were explicitly specified. Fall back to legacy behavior and
2178 * just return success.
2180 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2181 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2182 options->version <= 6))))
2185 data = kzalloc(sizeof(*data), GFP_KERNEL);
2189 /* fill out struct with values from existing mount */
2190 data->flags = nfss->flags;
2191 data->rsize = nfss->rsize;
2192 data->wsize = nfss->wsize;
2193 data->retrans = nfss->client->cl_timeout->to_retries;
2194 nfs_set_auth_parsed_mount_data(data, nfss->client->cl_auth->au_flavor);
2195 data->acregmin = nfss->acregmin / HZ;
2196 data->acregmax = nfss->acregmax / HZ;
2197 data->acdirmin = nfss->acdirmin / HZ;
2198 data->acdirmax = nfss->acdirmax / HZ;
2199 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
2200 data->nfs_server.port = nfss->port;
2201 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2202 data->version = nfsvers;
2203 data->minorversion = nfss->nfs_client->cl_minorversion;
2204 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2205 data->nfs_server.addrlen);
2207 /* overwrite those values with any that were specified */
2209 if (!nfs_parse_mount_options((char *)options, data))
2213 * noac is a special case. It implies -o sync, but that's not
2214 * necessarily reflected in the mtab options. do_remount_sb
2215 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2216 * remount options, so we have to explicitly reset it.
2218 if (data->flags & NFS_MOUNT_NOAC)
2219 *flags |= MS_SYNCHRONOUS;
2221 /* compare new mount options with old ones */
2222 error = nfs_compare_remount_data(nfss, data);
2227 EXPORT_SYMBOL_GPL(nfs_remount);
2230 * Initialise the common bits of the superblock
2232 inline void nfs_initialise_sb(struct super_block *sb)
2234 struct nfs_server *server = NFS_SB(sb);
2236 sb->s_magic = NFS_SUPER_MAGIC;
2238 /* We probably want something more informative here */
2239 snprintf(sb->s_id, sizeof(sb->s_id),
2240 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
2242 if (sb->s_blocksize == 0)
2243 sb->s_blocksize = nfs_block_bits(server->wsize,
2244 &sb->s_blocksize_bits);
2246 sb->s_bdi = &server->backing_dev_info;
2248 nfs_super_set_maxbytes(sb, server->maxfilesize);
2252 * Finish setting up an NFS2/3 superblock
2254 void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2256 struct nfs_parsed_mount_data *data = mount_info->parsed;
2257 struct nfs_server *server = NFS_SB(sb);
2259 sb->s_blocksize_bits = 0;
2260 sb->s_blocksize = 0;
2261 sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr;
2262 sb->s_op = server->nfs_client->cl_nfs_mod->sops;
2263 if (data && data->bsize)
2264 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
2266 if (server->nfs_client->rpc_ops->version != 2) {
2267 /* The VFS shouldn't apply the umask to mode bits. We will do
2268 * so ourselves when necessary.
2270 sb->s_flags |= MS_POSIXACL;
2271 sb->s_time_gran = 1;
2274 nfs_initialise_sb(sb);
2276 EXPORT_SYMBOL_GPL(nfs_fill_super);
2279 * Finish setting up a cloned NFS2/3/4 superblock
2281 void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
2283 const struct super_block *old_sb = mount_info->cloned->sb;
2284 struct nfs_server *server = NFS_SB(sb);
2286 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2287 sb->s_blocksize = old_sb->s_blocksize;
2288 sb->s_maxbytes = old_sb->s_maxbytes;
2289 sb->s_xattr = old_sb->s_xattr;
2290 sb->s_op = old_sb->s_op;
2291 sb->s_time_gran = 1;
2293 if (server->nfs_client->rpc_ops->version != 2) {
2294 /* The VFS shouldn't apply the umask to mode bits. We will do
2295 * so ourselves when necessary.
2297 sb->s_flags |= MS_POSIXACL;
2300 nfs_initialise_sb(sb);
2303 #define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2304 | NFS_MOUNT_SECURE \
2307 | NFS_MOUNT_KERBEROS \
2309 | NFS_MOUNT_BROKEN_SUID \
2310 | NFS_MOUNT_STRICTLOCK \
2311 | NFS_MOUNT_UNSHARED \
2312 | NFS_MOUNT_NORESVPORT \
2313 | NFS_MOUNT_LEGACY_INTERFACE)
2315 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2317 const struct nfs_server *a = s->s_fs_info;
2318 const struct rpc_clnt *clnt_a = a->client;
2319 const struct rpc_clnt *clnt_b = b->client;
2321 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2323 if (a->nfs_client != b->nfs_client)
2325 if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK)
2327 if (a->wsize != b->wsize)
2329 if (a->rsize != b->rsize)
2331 if (a->acregmin != b->acregmin)
2333 if (a->acregmax != b->acregmax)
2335 if (a->acdirmin != b->acdirmin)
2337 if (a->acdirmax != b->acdirmax)
2339 if (b->flags & NFS_MOUNT_SECFLAVOUR &&
2340 clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2347 struct nfs_sb_mountdata {
2348 struct nfs_server *server;
2352 static int nfs_set_super(struct super_block *s, void *data)
2354 struct nfs_sb_mountdata *sb_mntdata = data;
2355 struct nfs_server *server = sb_mntdata->server;
2358 s->s_flags = sb_mntdata->mntflags;
2359 s->s_fs_info = server;
2360 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
2361 ret = set_anon_super(s, server);
2363 server->s_dev = s->s_dev;
2367 static int nfs_compare_super_address(struct nfs_server *server1,
2368 struct nfs_server *server2)
2370 struct sockaddr *sap1, *sap2;
2372 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2373 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2375 if (sap1->sa_family != sap2->sa_family)
2378 switch (sap1->sa_family) {
2380 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2381 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2382 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2384 if (sin1->sin_port != sin2->sin_port)
2389 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2390 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2391 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2393 if (sin1->sin6_port != sin2->sin6_port)
2404 static int nfs_compare_super(struct super_block *sb, void *data)
2406 struct nfs_sb_mountdata *sb_mntdata = data;
2407 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2408 int mntflags = sb_mntdata->mntflags;
2410 if (!nfs_compare_super_address(old, server))
2412 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2413 if (old->flags & NFS_MOUNT_UNSHARED)
2415 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2417 return nfs_compare_mount_options(sb, server, mntflags);
2420 #ifdef CONFIG_NFS_FSCACHE
2421 static void nfs_get_cache_cookie(struct super_block *sb,
2422 struct nfs_parsed_mount_data *parsed,
2423 struct nfs_clone_mount *cloned)
2425 struct nfs_server *nfss = NFS_SB(sb);
2429 nfss->fscache_key = NULL;
2430 nfss->fscache = NULL;
2433 if (!(parsed->options & NFS_OPTION_FSCACHE))
2435 if (parsed->fscache_uniq) {
2436 uniq = parsed->fscache_uniq;
2437 ulen = strlen(parsed->fscache_uniq);
2439 } else if (cloned) {
2440 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2441 if (!(mnt_s->options & NFS_OPTION_FSCACHE))
2443 if (mnt_s->fscache_key) {
2444 uniq = mnt_s->fscache_key->key.uniquifier;
2445 ulen = mnt_s->fscache_key->key.uniq_len;
2450 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2453 static void nfs_get_cache_cookie(struct super_block *sb,
2454 struct nfs_parsed_mount_data *parsed,
2455 struct nfs_clone_mount *cloned)
2460 static int nfs_bdi_register(struct nfs_server *server)
2462 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2465 int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2466 struct nfs_mount_info *mount_info)
2469 unsigned long kflags = 0, kflags_out = 0;
2470 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL)
2471 kflags |= SECURITY_LSM_NATIVE_LABELS;
2473 error = security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts,
2474 kflags, &kflags_out);
2478 if (NFS_SB(s)->caps & NFS_CAP_SECURITY_LABEL &&
2479 !(kflags_out & SECURITY_LSM_NATIVE_LABELS))
2480 NFS_SB(s)->caps &= ~NFS_CAP_SECURITY_LABEL;
2484 EXPORT_SYMBOL_GPL(nfs_set_sb_security);
2486 int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2487 struct nfs_mount_info *mount_info)
2489 /* clone any lsm security options from the parent to the new sb */
2490 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2492 return security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2494 EXPORT_SYMBOL_GPL(nfs_clone_sb_security);
2496 struct dentry *nfs_fs_mount_common(struct nfs_server *server,
2497 int flags, const char *dev_name,
2498 struct nfs_mount_info *mount_info,
2499 struct nfs_subversion *nfs_mod)
2501 struct super_block *s;
2502 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2503 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2504 struct nfs_sb_mountdata sb_mntdata = {
2510 if (server->flags & NFS_MOUNT_UNSHARED)
2511 compare_super = NULL;
2513 /* -o noac implies -o sync */
2514 if (server->flags & NFS_MOUNT_NOAC)
2515 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2517 if (mount_info->cloned != NULL && mount_info->cloned->sb != NULL)
2518 if (mount_info->cloned->sb->s_flags & MS_SYNCHRONOUS)
2519 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2521 /* Get a superblock - note that we may end up sharing one that already exists */
2522 s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
2524 mntroot = ERR_CAST(s);
2528 if (s->s_fs_info != server) {
2529 nfs_free_server(server);
2532 error = nfs_bdi_register(server);
2534 mntroot = ERR_PTR(error);
2535 goto error_splat_bdi;
2541 /* initial superblock/root creation */
2542 mount_info->fill_super(s, mount_info);
2543 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
2546 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
2547 if (IS_ERR(mntroot))
2548 goto error_splat_super;
2550 error = mount_info->set_security(s, mntroot, mount_info);
2552 goto error_splat_root;
2554 s->s_flags |= MS_ACTIVE;
2560 nfs_free_server(server);
2565 mntroot = ERR_PTR(error);
2567 if (server && !s->s_root)
2568 bdi_unregister(&server->backing_dev_info);
2570 deactivate_locked_super(s);
2573 EXPORT_SYMBOL_GPL(nfs_fs_mount_common);
2575 struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2576 int flags, const char *dev_name, void *raw_data)
2578 struct nfs_mount_info mount_info = {
2579 .fill_super = nfs_fill_super,
2580 .set_security = nfs_set_sb_security,
2582 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2583 struct nfs_subversion *nfs_mod;
2586 mount_info.parsed = nfs_alloc_parsed_mount_data();
2587 mount_info.mntfh = nfs_alloc_fhandle();
2588 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
2591 /* Validate the mount data */
2592 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
2593 if (error == NFS_TEXT_DATA)
2594 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
2596 mntroot = ERR_PTR(error);
2600 nfs_mod = get_nfs_version(mount_info.parsed->version);
2601 if (IS_ERR(nfs_mod)) {
2602 mntroot = ERR_CAST(nfs_mod);
2606 mntroot = nfs_mod->rpc_ops->try_mount(flags, dev_name, &mount_info, nfs_mod);
2608 put_nfs_version(nfs_mod);
2610 nfs_free_parsed_mount_data(mount_info.parsed);
2611 nfs_free_fhandle(mount_info.mntfh);
2614 EXPORT_SYMBOL_GPL(nfs_fs_mount);
2617 * Ensure that we unregister the bdi before kill_anon_super
2618 * releases the device name
2620 void nfs_put_super(struct super_block *s)
2622 struct nfs_server *server = NFS_SB(s);
2624 bdi_unregister(&server->backing_dev_info);
2626 EXPORT_SYMBOL_GPL(nfs_put_super);
2629 * Destroy an NFS2/3 superblock
2631 void nfs_kill_super(struct super_block *s)
2633 struct nfs_server *server = NFS_SB(s);
2636 nfs_fscache_release_super_cookie(s);
2637 nfs_free_server(server);
2639 EXPORT_SYMBOL_GPL(nfs_kill_super);
2642 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2644 static struct dentry *
2645 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2646 const char *dev_name, void *raw_data)
2648 struct nfs_clone_mount *data = raw_data;
2649 struct nfs_mount_info mount_info = {
2650 .fill_super = nfs_clone_super,
2651 .set_security = nfs_clone_sb_security,
2654 struct nfs_server *server;
2655 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2656 struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
2658 dprintk("--> nfs_xdev_mount()\n");
2660 mount_info.mntfh = mount_info.cloned->fh;
2662 /* create a new volume representation */
2663 server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
2666 mntroot = ERR_CAST(server);
2668 mntroot = nfs_fs_mount_common(server, flags,
2669 dev_name, &mount_info, nfs_mod);
2671 dprintk("<-- nfs_xdev_mount() = %ld\n",
2672 IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
2676 #if IS_ENABLED(CONFIG_NFS_V4)
2678 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2680 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2681 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
2685 * Validate NFSv4 mount options
2687 static int nfs4_validate_mount_data(void *options,
2688 struct nfs_parsed_mount_data *args,
2689 const char *dev_name)
2691 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2692 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2700 switch (data->version) {
2702 if (data->host_addrlen > sizeof(args->nfs_server.address))
2703 goto out_no_address;
2704 if (data->host_addrlen == 0)
2705 goto out_no_address;
2706 args->nfs_server.addrlen = data->host_addrlen;
2707 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
2709 if (!nfs_verify_server_address(sap))
2710 goto out_no_address;
2711 args->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port);
2713 if (data->auth_flavourlen) {
2714 rpc_authflavor_t pseudoflavor;
2715 if (data->auth_flavourlen > 1)
2716 goto out_inval_auth;
2717 if (copy_from_user(&pseudoflavor,
2718 data->auth_flavours,
2719 sizeof(pseudoflavor)))
2721 nfs_set_auth_parsed_mount_data(args, pseudoflavor);
2723 nfs_set_auth_parsed_mount_data(args, RPC_AUTH_UNIX);
2725 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2728 args->nfs_server.hostname = c;
2730 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2733 args->nfs_server.export_path = c;
2734 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2736 c = strndup_user(data->client_addr.data, 16);
2739 args->client_address = c;
2742 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2746 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2747 args->rsize = data->rsize;
2748 args->wsize = data->wsize;
2749 args->timeo = data->timeo;
2750 args->retrans = data->retrans;
2751 args->acregmin = data->acregmin;
2752 args->acregmax = data->acregmax;
2753 args->acdirmin = data->acdirmin;
2754 args->acdirmax = data->acdirmax;
2755 args->nfs_server.protocol = data->proto;
2756 nfs_validate_transport_protocol(args);
2757 if (args->nfs_server.protocol == XPRT_TRANSPORT_UDP)
2758 goto out_invalid_transport_udp;
2762 return NFS_TEXT_DATA;
2768 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2772 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2773 data->auth_flavourlen);
2777 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2780 out_invalid_transport_udp:
2781 dfprintk(MOUNT, "NFSv4: Unsupported transport protocol udp\n");
2786 * NFS v4 module parameters need to stay in the
2787 * NFS client for backwards compatibility
2789 unsigned int nfs_callback_set_tcpport;
2790 unsigned short nfs_callback_tcpport;
2791 /* Default cache timeout is 10 minutes */
2792 unsigned int nfs_idmap_cache_timeout = 600;
2793 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2794 bool nfs4_disable_idmapping = true;
2795 unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
2796 unsigned short send_implementation_id = 1;
2797 char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = "";
2798 bool recover_lost_locks = false;
2800 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport);
2801 EXPORT_SYMBOL_GPL(nfs_callback_tcpport);
2802 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout);
2803 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping);
2804 EXPORT_SYMBOL_GPL(max_session_slots);
2805 EXPORT_SYMBOL_GPL(send_implementation_id);
2806 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier);
2807 EXPORT_SYMBOL_GPL(recover_lost_locks);
2809 #define NFS_CALLBACK_MAXPORTNR (65535U)
2811 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2818 ret = kstrtoul(val, 0, &num);
2819 if (ret == -EINVAL || num > NFS_CALLBACK_MAXPORTNR)
2821 *((unsigned int *)kp->arg) = num;
2824 static struct kernel_param_ops param_ops_portnr = {
2825 .set = param_set_portnr,
2826 .get = param_get_uint,
2828 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2830 module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644);
2831 module_param(nfs_idmap_cache_timeout, int, 0644);
2832 module_param(nfs4_disable_idmapping, bool, 0644);
2833 module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier,
2834 NFS4_CLIENT_ID_UNIQ_LEN, 0600);
2835 MODULE_PARM_DESC(nfs4_disable_idmapping,
2836 "Turn off NFSv4 idmapping when using 'sec=sys'");
2837 module_param(max_session_slots, ushort, 0644);
2838 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
2839 "requests the client will negotiate");
2840 module_param(send_implementation_id, ushort, 0644);
2841 MODULE_PARM_DESC(send_implementation_id,
2842 "Send implementation ID with NFSv4.1 exchange_id");
2843 MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string");
2845 module_param(recover_lost_locks, bool, 0644);
2846 MODULE_PARM_DESC(recover_lost_locks,
2847 "If the server reports that a lock might be lost, "
2848 "try to recover it risking data corruption.");
2851 #endif /* CONFIG_NFS_V4 */