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
;
500 } sec_flavours
[NFS_AUTH_INFO_MAX_FLAVORS
] = {
501 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
502 { RPC_AUTH_NULL
, "null" },
503 { RPC_AUTH_UNIX
, "sys" },
504 { RPC_AUTH_GSS_KRB5
, "krb5" },
505 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
506 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
507 { RPC_AUTH_GSS_LKEY
, "lkey" },
508 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
509 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
510 { RPC_AUTH_GSS_SPKM
, "spkm" },
511 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
512 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
513 { UINT_MAX
, "unknown" }
517 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
518 if (sec_flavours
[i
].flavour
== flavour
)
521 return sec_flavours
[i
].str
;
524 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
527 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
529 seq_printf(m
, ",mountproto=");
530 switch (sap
->sa_family
) {
532 switch (nfss
->mountd_protocol
) {
534 seq_printf(m
, RPCBIND_NETID_UDP
);
537 seq_printf(m
, RPCBIND_NETID_TCP
);
541 seq_printf(m
, "auto");
545 switch (nfss
->mountd_protocol
) {
547 seq_printf(m
, RPCBIND_NETID_UDP6
);
550 seq_printf(m
, RPCBIND_NETID_TCP6
);
554 seq_printf(m
, "auto");
559 seq_printf(m
, "auto");
563 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
566 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
568 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
571 switch (sap
->sa_family
) {
573 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
574 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
578 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
579 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
584 seq_printf(m
, ",mountaddr=unspecified");
587 if (nfss
->mountd_version
|| showdefaults
)
588 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
589 if ((nfss
->mountd_port
&&
590 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
592 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
594 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
597 #if IS_ENABLED(CONFIG_NFS_V4)
598 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
601 struct nfs_client
*clp
= nfss
->nfs_client
;
603 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
606 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
612 static void nfs_show_nfs_version(struct seq_file
*m
,
613 unsigned int version
,
614 unsigned int minorversion
)
616 seq_printf(m
, ",vers=%u", version
);
618 seq_printf(m
, ".%u", minorversion
);
622 * Describe the mount options in force on this server representation
624 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
627 static const struct proc_nfs_info
{
632 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
633 { NFS_MOUNT_POSIX
, ",posix", "" },
634 { NFS_MOUNT_NOCTO
, ",nocto", "" },
635 { NFS_MOUNT_NOAC
, ",noac", "" },
636 { NFS_MOUNT_NONLM
, ",nolock", "" },
637 { NFS_MOUNT_NOACL
, ",noacl", "" },
638 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
639 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
640 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
643 const struct proc_nfs_info
*nfs_infop
;
644 struct nfs_client
*clp
= nfss
->nfs_client
;
645 u32 version
= clp
->rpc_ops
->version
;
646 int local_flock
, local_fcntl
;
648 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
649 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
650 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
651 if (nfss
->bsize
!= 0)
652 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
653 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
654 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
655 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
656 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
657 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
658 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
659 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
660 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
661 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
662 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
663 if (nfss
->flags
& nfs_infop
->flag
)
664 seq_puts(m
, nfs_infop
->str
);
666 seq_puts(m
, nfs_infop
->nostr
);
669 seq_printf(m
, ",proto=%s",
670 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
673 if (nfss
->port
!= NFS_PORT
)
674 seq_printf(m
, ",port=%u", nfss
->port
);
677 seq_printf(m
, ",port=%u", nfss
->port
);
679 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
680 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
681 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
684 nfs_show_mountd_options(m
, nfss
, showdefaults
);
686 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
688 if (nfss
->options
& NFS_OPTION_FSCACHE
)
689 seq_printf(m
, ",fsc");
691 if (nfss
->options
& NFS_OPTION_MIGRATION
)
692 seq_printf(m
, ",migration");
694 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
695 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
696 seq_printf(m
, ",lookupcache=none");
698 seq_printf(m
, ",lookupcache=pos");
701 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
702 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
704 if (!local_flock
&& !local_fcntl
)
705 seq_printf(m
, ",local_lock=none");
706 else if (local_flock
&& local_fcntl
)
707 seq_printf(m
, ",local_lock=all");
708 else if (local_flock
)
709 seq_printf(m
, ",local_lock=flock");
711 seq_printf(m
, ",local_lock=posix");
715 * Describe the mount options on this VFS mountpoint
717 int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
719 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
721 nfs_show_mount_options(m
, nfss
, 0);
724 seq_printf(m
, ",addr=%s",
725 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
731 EXPORT_SYMBOL_GPL(nfs_show_options
);
733 #if IS_ENABLED(CONFIG_NFS_V4)
734 #ifdef CONFIG_NFS_V4_1
735 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
737 if (nfs4_has_session(server
->nfs_client
))
738 seq_printf(m
, ",sessions");
741 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
745 #ifdef CONFIG_NFS_V4_1
746 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
748 seq_printf(m
, ",pnfs=");
749 if (server
->pnfs_curr_ld
)
750 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
752 seq_printf(m
, "not configured");
755 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
757 if (nfss
->nfs_client
&& nfss
->nfs_client
->cl_implid
) {
758 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->cl_implid
;
759 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
761 impl_id
->name
, impl_id
->domain
,
762 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
766 #if IS_ENABLED(CONFIG_NFS_V4)
767 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
771 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
776 int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
778 char *page
= (char *) __get_free_page(GFP_KERNEL
);
779 char *devname
, *dummy
;
783 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
, 0);
785 err
= PTR_ERR(devname
);
787 seq_escape(m
, devname
, " \t\n\\");
788 free_page((unsigned long)page
);
791 EXPORT_SYMBOL_GPL(nfs_show_devname
);
793 int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
798 EXPORT_SYMBOL_GPL(nfs_show_path
);
801 * Present statistical information for this VFS mountpoint
803 int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
806 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
807 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
808 struct nfs_iostats totals
= { };
810 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
813 * Display all mount option settings
815 seq_printf(m
, "\n\topts:\t");
816 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
817 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
818 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
819 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
820 nfs_show_mount_options(m
, nfss
, 1);
822 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
824 show_implementation_id(m
, nfss
);
826 seq_printf(m
, "\n\tcaps:\t");
827 seq_printf(m
, "caps=0x%x", nfss
->caps
);
828 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
829 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
830 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
831 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
833 #if IS_ENABLED(CONFIG_NFS_V4)
834 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
835 seq_printf(m
, "\n\tnfsv4:\t");
836 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
837 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
838 seq_printf(m
, ",bm2=0x%x", nfss
->attr_bitmask
[2]);
839 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
840 show_sessions(m
, nfss
);
846 * Display security flavor in effect for this mount
848 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
850 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
853 * Display superblock I/O counters
855 for_each_possible_cpu(cpu
) {
856 struct nfs_iostats
*stats
;
859 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
861 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
862 totals
.events
[i
] += stats
->events
[i
];
863 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
864 totals
.bytes
[i
] += stats
->bytes
[i
];
865 #ifdef CONFIG_NFS_FSCACHE
866 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
867 totals
.fscache
[i
] += stats
->fscache
[i
];
873 seq_printf(m
, "\n\tevents:\t");
874 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
875 seq_printf(m
, "%lu ", totals
.events
[i
]);
876 seq_printf(m
, "\n\tbytes:\t");
877 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
878 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
879 #ifdef CONFIG_NFS_FSCACHE
880 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
881 seq_printf(m
, "\n\tfsc:\t");
882 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
883 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
888 rpc_print_iostats(m
, nfss
->client
);
892 EXPORT_SYMBOL_GPL(nfs_show_stats
);
895 * Begin unmount by attempting to remove all automounted mountpoints we added
896 * in response to xdev traversals and referrals
898 void nfs_umount_begin(struct super_block
*sb
)
900 struct nfs_server
*server
;
901 struct rpc_clnt
*rpc
;
904 /* -EIO all pending I/O */
905 rpc
= server
->client_acl
;
907 rpc_killall_tasks(rpc
);
908 rpc
= server
->client
;
910 rpc_killall_tasks(rpc
);
912 EXPORT_SYMBOL_GPL(nfs_umount_begin
);
914 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(void)
916 struct nfs_parsed_mount_data
*data
;
918 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
920 data
->acregmin
= NFS_DEF_ACREGMIN
;
921 data
->acregmax
= NFS_DEF_ACREGMAX
;
922 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
923 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
924 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
925 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
926 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
927 data
->selected_flavor
= RPC_AUTH_MAXFLAVOR
;
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
;
1023 * Add 'flavor' to 'auth_info' if not already present.
1024 * Returns true if 'flavor' ends up in the list, false otherwise
1026 static bool nfs_auth_info_add(struct nfs_auth_info
*auth_info
,
1027 rpc_authflavor_t flavor
)
1030 unsigned int max_flavor_len
= (sizeof(auth_info
->flavors
) /
1031 sizeof(auth_info
->flavors
[0]));
1033 /* make sure this flavor isn't already in the list */
1034 for (i
= 0; i
< auth_info
->flavor_len
; i
++) {
1035 if (flavor
== auth_info
->flavors
[i
])
1039 if (auth_info
->flavor_len
+ 1 >= max_flavor_len
) {
1040 dfprintk(MOUNT
, "NFS: too many sec= flavors\n");
1044 auth_info
->flavors
[auth_info
->flavor_len
++] = flavor
;
1049 * Return true if 'match' is in auth_info or auth_info is empty.
1050 * Return false otherwise.
1052 bool nfs_auth_info_match(const struct nfs_auth_info
*auth_info
,
1053 rpc_authflavor_t match
)
1057 if (!auth_info
->flavor_len
)
1060 for (i
= 0; i
< auth_info
->flavor_len
; i
++) {
1061 if (auth_info
->flavors
[i
] == match
)
1066 EXPORT_SYMBOL_GPL(nfs_auth_info_match
);
1069 * Parse the value of the 'sec=' option.
1071 static int nfs_parse_security_flavors(char *value
,
1072 struct nfs_parsed_mount_data
*mnt
)
1074 substring_t args
[MAX_OPT_ARGS
];
1075 rpc_authflavor_t pseudoflavor
;
1078 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1080 while ((p
= strsep(&value
, ":")) != NULL
) {
1081 switch (match_token(p
, nfs_secflavor_tokens
, args
)) {
1083 pseudoflavor
= RPC_AUTH_NULL
;
1086 pseudoflavor
= RPC_AUTH_UNIX
;
1089 pseudoflavor
= RPC_AUTH_GSS_KRB5
;
1092 pseudoflavor
= RPC_AUTH_GSS_KRB5I
;
1095 pseudoflavor
= RPC_AUTH_GSS_KRB5P
;
1098 pseudoflavor
= RPC_AUTH_GSS_LKEY
;
1101 pseudoflavor
= RPC_AUTH_GSS_LKEYI
;
1104 pseudoflavor
= RPC_AUTH_GSS_LKEYP
;
1107 pseudoflavor
= RPC_AUTH_GSS_SPKM
;
1110 pseudoflavor
= RPC_AUTH_GSS_SPKMI
;
1113 pseudoflavor
= RPC_AUTH_GSS_SPKMP
;
1117 "NFS: sec= option '%s' not recognized\n", p
);
1121 if (!nfs_auth_info_add(&mnt
->auth_info
, pseudoflavor
))
1128 static int nfs_parse_version_string(char *string
,
1129 struct nfs_parsed_mount_data
*mnt
,
1132 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1133 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1138 mnt
->flags
|= NFS_MOUNT_VER3
;
1142 /* Backward compatibility option. In future,
1143 * the mount program should always supply
1144 * a NFSv4 minor version number.
1150 mnt
->minorversion
= 0;
1154 mnt
->minorversion
= 1;
1158 mnt
->minorversion
= 2;
1166 static int nfs_get_option_str(substring_t args
[], char **option
)
1169 *option
= match_strdup(args
);
1173 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1178 string
= match_strdup(args
);
1181 rc
= kstrtoul(string
, 10, option
);
1188 * Error-check and convert a string of mount options from user space into
1189 * a data structure. The whole mount string is processed; bad options are
1190 * skipped as they are encountered. If there were no errors, return 1;
1191 * otherwise return 0 (zero).
1193 static int nfs_parse_mount_options(char *raw
,
1194 struct nfs_parsed_mount_data
*mnt
)
1196 char *p
, *string
, *secdata
;
1197 int rc
, sloppy
= 0, invalid_option
= 0;
1198 unsigned short protofamily
= AF_UNSPEC
;
1199 unsigned short mountfamily
= AF_UNSPEC
;
1202 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1205 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1207 secdata
= alloc_secdata();
1211 rc
= security_sb_copy_data(raw
, secdata
);
1213 goto out_security_failure
;
1215 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1217 goto out_security_failure
;
1219 free_secdata(secdata
);
1221 while ((p
= strsep(&raw
, ",")) != NULL
) {
1222 substring_t args
[MAX_OPT_ARGS
];
1223 unsigned long option
;
1229 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1231 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1235 * boolean options: foo/nofoo
1238 mnt
->flags
|= NFS_MOUNT_SOFT
;
1241 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1244 mnt
->flags
|= NFS_MOUNT_POSIX
;
1247 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1250 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1253 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1256 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1259 mnt
->flags
|= NFS_MOUNT_NOAC
;
1262 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1263 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1264 NFS_MOUNT_LOCAL_FCNTL
);
1267 mnt
->flags
|= NFS_MOUNT_NONLM
;
1268 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1269 NFS_MOUNT_LOCAL_FCNTL
);
1272 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1273 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1276 mnt
->flags
|= NFS_MOUNT_TCP
;
1277 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1280 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1281 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1282 xprt_load_transport(p
);
1285 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1288 mnt
->flags
|= NFS_MOUNT_NOACL
;
1291 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1293 case Opt_nordirplus
:
1294 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1296 case Opt_sharecache
:
1297 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1299 case Opt_nosharecache
:
1300 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1303 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1305 case Opt_noresvport
:
1306 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1309 mnt
->options
|= NFS_OPTION_FSCACHE
;
1310 kfree(mnt
->fscache_uniq
);
1311 mnt
->fscache_uniq
= NULL
;
1314 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1315 kfree(mnt
->fscache_uniq
);
1316 mnt
->fscache_uniq
= NULL
;
1319 mnt
->options
|= NFS_OPTION_MIGRATION
;
1321 case Opt_nomigration
:
1322 mnt
->options
&= NFS_OPTION_MIGRATION
;
1326 * options that take numeric values
1329 if (nfs_get_option_ul(args
, &option
) ||
1331 goto out_invalid_value
;
1332 mnt
->nfs_server
.port
= option
;
1335 if (nfs_get_option_ul(args
, &option
))
1336 goto out_invalid_value
;
1337 mnt
->rsize
= option
;
1340 if (nfs_get_option_ul(args
, &option
))
1341 goto out_invalid_value
;
1342 mnt
->wsize
= option
;
1345 if (nfs_get_option_ul(args
, &option
))
1346 goto out_invalid_value
;
1347 mnt
->bsize
= option
;
1350 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1351 goto out_invalid_value
;
1352 mnt
->timeo
= option
;
1355 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1356 goto out_invalid_value
;
1357 mnt
->retrans
= option
;
1360 if (nfs_get_option_ul(args
, &option
))
1361 goto out_invalid_value
;
1362 mnt
->acregmin
= option
;
1365 if (nfs_get_option_ul(args
, &option
))
1366 goto out_invalid_value
;
1367 mnt
->acregmax
= option
;
1370 if (nfs_get_option_ul(args
, &option
))
1371 goto out_invalid_value
;
1372 mnt
->acdirmin
= option
;
1375 if (nfs_get_option_ul(args
, &option
))
1376 goto out_invalid_value
;
1377 mnt
->acdirmax
= option
;
1380 if (nfs_get_option_ul(args
, &option
))
1381 goto out_invalid_value
;
1382 mnt
->acregmin
= mnt
->acregmax
=
1383 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1386 if (nfs_get_option_ul(args
, &option
))
1387 goto out_invalid_value
;
1388 mnt
->namlen
= option
;
1391 if (nfs_get_option_ul(args
, &option
) ||
1393 goto out_invalid_value
;
1394 mnt
->mount_server
.port
= option
;
1397 if (nfs_get_option_ul(args
, &option
) ||
1398 option
< NFS_MNT_VERSION
||
1399 option
> NFS_MNT3_VERSION
)
1400 goto out_invalid_value
;
1401 mnt
->mount_server
.version
= option
;
1403 case Opt_minorversion
:
1404 if (nfs_get_option_ul(args
, &option
))
1405 goto out_invalid_value
;
1406 if (option
> NFS4_MAX_MINOR_VERSION
)
1407 goto out_invalid_value
;
1408 mnt
->minorversion
= option
;
1412 * options that take text values
1415 string
= match_strdup(args
);
1418 rc
= nfs_parse_version_string(string
, mnt
, args
);
1421 goto out_invalid_value
;
1424 string
= match_strdup(args
);
1427 rc
= nfs_parse_security_flavors(string
, mnt
);
1430 dfprintk(MOUNT
, "NFS: unrecognized "
1431 "security flavor\n");
1436 string
= match_strdup(args
);
1439 token
= match_token(string
,
1440 nfs_xprt_protocol_tokens
, args
);
1442 protofamily
= AF_INET
;
1445 protofamily
= AF_INET6
;
1447 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1448 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1451 protofamily
= AF_INET6
;
1453 mnt
->flags
|= NFS_MOUNT_TCP
;
1454 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1457 /* vector side protocols to TCP */
1458 mnt
->flags
|= NFS_MOUNT_TCP
;
1459 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1460 xprt_load_transport(string
);
1463 dfprintk(MOUNT
, "NFS: unrecognized "
1464 "transport protocol\n");
1470 case Opt_mountproto
:
1471 string
= match_strdup(args
);
1474 token
= match_token(string
,
1475 nfs_xprt_protocol_tokens
, args
);
1478 mountfamily
= AF_INET
;
1481 mountfamily
= AF_INET6
;
1483 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1486 mountfamily
= AF_INET6
;
1488 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1490 case Opt_xprt_rdma
: /* not used for side protocols */
1492 dfprintk(MOUNT
, "NFS: unrecognized "
1493 "transport protocol\n");
1498 string
= match_strdup(args
);
1501 mnt
->nfs_server
.addrlen
=
1502 rpc_pton(mnt
->net
, string
, strlen(string
),
1504 &mnt
->nfs_server
.address
,
1505 sizeof(mnt
->nfs_server
.address
));
1507 if (mnt
->nfs_server
.addrlen
== 0)
1508 goto out_invalid_address
;
1510 case Opt_clientaddr
:
1511 if (nfs_get_option_str(args
, &mnt
->client_address
))
1515 if (nfs_get_option_str(args
,
1516 &mnt
->mount_server
.hostname
))
1520 string
= match_strdup(args
);
1523 mnt
->mount_server
.addrlen
=
1524 rpc_pton(mnt
->net
, string
, strlen(string
),
1526 &mnt
->mount_server
.address
,
1527 sizeof(mnt
->mount_server
.address
));
1529 if (mnt
->mount_server
.addrlen
== 0)
1530 goto out_invalid_address
;
1532 case Opt_lookupcache
:
1533 string
= match_strdup(args
);
1536 token
= match_token(string
,
1537 nfs_lookupcache_tokens
, args
);
1540 case Opt_lookupcache_all
:
1541 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1543 case Opt_lookupcache_positive
:
1544 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1545 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1547 case Opt_lookupcache_none
:
1548 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1551 dfprintk(MOUNT
, "NFS: invalid "
1552 "lookupcache argument\n");
1556 case Opt_fscache_uniq
:
1557 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1559 mnt
->options
|= NFS_OPTION_FSCACHE
;
1561 case Opt_local_lock
:
1562 string
= match_strdup(args
);
1565 token
= match_token(string
, nfs_local_lock_tokens
,
1569 case Opt_local_lock_all
:
1570 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1571 NFS_MOUNT_LOCAL_FCNTL
);
1573 case Opt_local_lock_flock
:
1574 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1576 case Opt_local_lock_posix
:
1577 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1579 case Opt_local_lock_none
:
1580 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1581 NFS_MOUNT_LOCAL_FCNTL
);
1584 dfprintk(MOUNT
, "NFS: invalid "
1585 "local_lock argument\n");
1595 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1598 case Opt_deprecated
:
1599 dfprintk(MOUNT
, "NFS: ignoring mount option "
1605 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1610 if (!sloppy
&& invalid_option
)
1613 if (mnt
->minorversion
&& mnt
->version
!= 4)
1614 goto out_minorversion_mismatch
;
1616 if (mnt
->options
& NFS_OPTION_MIGRATION
&&
1617 (mnt
->version
!= 4 || mnt
->minorversion
!= 0))
1618 goto out_migration_misuse
;
1621 * verify that any proto=/mountproto= options match the address
1622 * families in the addr=/mountaddr= options.
1624 if (protofamily
!= AF_UNSPEC
&&
1625 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1626 goto out_proto_mismatch
;
1628 if (mountfamily
!= AF_UNSPEC
) {
1629 if (mnt
->mount_server
.addrlen
) {
1630 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1631 goto out_mountproto_mismatch
;
1633 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1634 goto out_mountproto_mismatch
;
1640 out_mountproto_mismatch
:
1641 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1645 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1647 out_invalid_address
:
1648 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1651 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1653 out_minorversion_mismatch
:
1654 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1655 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1657 out_migration_misuse
:
1659 "NFS: 'migration' not supported for this NFS version\n");
1662 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1664 out_security_failure
:
1665 free_secdata(secdata
);
1666 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1671 * Ensure that a specified authtype in args->auth_info is supported by
1672 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1675 static int nfs_verify_authflavors(struct nfs_parsed_mount_data
*args
,
1676 rpc_authflavor_t
*server_authlist
, unsigned int count
)
1678 rpc_authflavor_t flavor
= RPC_AUTH_MAXFLAVOR
;
1682 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1683 * must be in the list returned by the server.
1685 * AUTH_NULL has a special meaning when it's in the server list - it
1686 * means that the server will ignore the rpc creds, so any flavor
1689 for (i
= 0; i
< count
; i
++) {
1690 flavor
= server_authlist
[i
];
1692 if (nfs_auth_info_match(&args
->auth_info
, flavor
) ||
1693 flavor
== RPC_AUTH_NULL
)
1698 "NFS: specified auth flavors not supported by server\n");
1702 args
->selected_flavor
= flavor
;
1703 dfprintk(MOUNT
, "NFS: using auth flavor %u\n", args
->selected_flavor
);
1708 * Use the remote server's MOUNT service to request the NFS file handle
1709 * corresponding to the provided path.
1711 static int nfs_request_mount(struct nfs_parsed_mount_data
*args
,
1712 struct nfs_fh
*root_fh
,
1713 rpc_authflavor_t
*server_authlist
,
1714 unsigned int *server_authlist_len
)
1716 struct nfs_mount_request request
= {
1717 .sap
= (struct sockaddr
*)
1718 &args
->mount_server
.address
,
1719 .dirpath
= args
->nfs_server
.export_path
,
1720 .protocol
= args
->mount_server
.protocol
,
1722 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1723 .auth_flav_len
= server_authlist_len
,
1724 .auth_flavs
= server_authlist
,
1729 if (args
->mount_server
.version
== 0) {
1730 switch (args
->version
) {
1732 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1735 args
->mount_server
.version
= NFS_MNT_VERSION
;
1738 request
.version
= args
->mount_server
.version
;
1740 if (args
->mount_server
.hostname
)
1741 request
.hostname
= args
->mount_server
.hostname
;
1743 request
.hostname
= args
->nfs_server
.hostname
;
1746 * Construct the mount server's address.
1748 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1749 memcpy(request
.sap
, &args
->nfs_server
.address
,
1750 args
->nfs_server
.addrlen
);
1751 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1753 request
.salen
= args
->mount_server
.addrlen
;
1754 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1757 * Now ask the mount server to map our export path
1760 status
= nfs_mount(&request
);
1762 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1763 request
.hostname
, status
);
1770 static struct nfs_server
*nfs_try_mount_request(struct nfs_mount_info
*mount_info
,
1771 struct nfs_subversion
*nfs_mod
)
1775 bool tried_auth_unix
= false;
1776 bool auth_null_in_list
= false;
1777 struct nfs_server
*server
= ERR_PTR(-EACCES
);
1778 struct nfs_parsed_mount_data
*args
= mount_info
->parsed
;
1779 rpc_authflavor_t authlist
[NFS_MAX_SECFLAVORS
];
1780 unsigned int authlist_len
= ARRAY_SIZE(authlist
);
1782 status
= nfs_request_mount(args
, mount_info
->mntfh
, authlist
,
1785 return ERR_PTR(status
);
1788 * Was a sec= authflavor specified in the options? First, verify
1789 * whether the server supports it, and then just try to use it if so.
1791 if (args
->auth_info
.flavor_len
> 0) {
1792 status
= nfs_verify_authflavors(args
, authlist
, authlist_len
);
1793 dfprintk(MOUNT
, "NFS: using auth flavor %u\n",
1794 args
->selected_flavor
);
1796 return ERR_PTR(status
);
1797 return nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1801 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1802 * SHOULD prefer the flavor listed first. However, some servers list
1803 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1805 for (i
= 0; i
< authlist_len
; ++i
) {
1806 rpc_authflavor_t flavor
;
1807 struct rpcsec_gss_info info
;
1809 flavor
= authlist
[i
];
1812 tried_auth_unix
= true;
1815 auth_null_in_list
= true;
1818 if (rpcauth_get_gssinfo(flavor
, &info
) != 0)
1822 dfprintk(MOUNT
, "NFS: attempting to use auth flavor %u\n", flavor
);
1823 args
->selected_flavor
= flavor
;
1824 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1825 if (!IS_ERR(server
))
1830 * Nothing we tried so far worked. At this point, give up if we've
1831 * already tried AUTH_UNIX or if the server's list doesn't contain
1834 if (tried_auth_unix
|| !auth_null_in_list
)
1837 /* Last chance! Try AUTH_UNIX */
1838 dfprintk(MOUNT
, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX
);
1839 args
->selected_flavor
= RPC_AUTH_UNIX
;
1840 return nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1843 struct dentry
*nfs_try_mount(int flags
, const char *dev_name
,
1844 struct nfs_mount_info
*mount_info
,
1845 struct nfs_subversion
*nfs_mod
)
1847 struct nfs_server
*server
;
1849 if (mount_info
->parsed
->need_mount
)
1850 server
= nfs_try_mount_request(mount_info
, nfs_mod
);
1852 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1855 return ERR_CAST(server
);
1857 return nfs_fs_mount_common(server
, flags
, dev_name
, mount_info
, nfs_mod
);
1859 EXPORT_SYMBOL_GPL(nfs_try_mount
);
1862 * Split "dev_name" into "hostname:export_path".
1864 * The leftmost colon demarks the split between the server's hostname
1865 * and the export path. If the hostname starts with a left square
1866 * bracket, then it may contain colons.
1868 * Note: caller frees hostname and export path, even on error.
1870 static int nfs_parse_devname(const char *dev_name
,
1871 char **hostname
, size_t maxnamlen
,
1872 char **export_path
, size_t maxpathlen
)
1877 /* Is the host name protected with square brakcets? */
1878 if (*dev_name
== '[') {
1879 end
= strchr(++dev_name
, ']');
1880 if (end
== NULL
|| end
[1] != ':')
1881 goto out_bad_devname
;
1883 len
= end
- dev_name
;
1888 end
= strchr(dev_name
, ':');
1890 goto out_bad_devname
;
1891 len
= end
- dev_name
;
1893 /* kill possible hostname list: not supported */
1894 comma
= strchr(dev_name
, ',');
1895 if (comma
!= NULL
&& comma
< end
)
1899 if (len
> maxnamlen
)
1902 /* N.B. caller will free nfs_server.hostname in all cases */
1903 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1904 if (*hostname
== NULL
)
1906 len
= strlen(++end
);
1907 if (len
> maxpathlen
)
1909 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1913 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1917 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1921 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1925 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1926 return -ENAMETOOLONG
;
1929 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1930 return -ENAMETOOLONG
;
1934 * Validate the NFS2/NFS3 mount data
1935 * - fills in the mount root filehandle
1937 * For option strings, user space handles the following behaviors:
1939 * + DNS: mapping server host name to IP address ("addr=" option)
1941 * + failure mode: how to behave if a mount request can't be handled
1942 * immediately ("fg/bg" option)
1944 * + retry: how often to retry a mount request ("retry=" option)
1946 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1947 * mountproto=tcp after mountproto=udp, and so on
1949 static int nfs23_validate_mount_data(void *options
,
1950 struct nfs_parsed_mount_data
*args
,
1951 struct nfs_fh
*mntfh
,
1952 const char *dev_name
)
1954 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1955 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1956 int extra_flags
= NFS_MOUNT_LEGACY_INTERFACE
;
1961 args
->version
= NFS_DEFAULT_VERSION
;
1962 switch (data
->version
) {
1968 if (data
->flags
& NFS_MOUNT_VER3
)
1970 data
->root
.size
= NFS2_FHSIZE
;
1971 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1972 /* Turn off security negotiation */
1973 extra_flags
|= NFS_MOUNT_SECFLAVOUR
;
1975 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1978 memset(data
->context
, 0, sizeof(data
->context
));
1980 if (data
->flags
& NFS_MOUNT_VER3
) {
1981 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1982 goto out_invalid_fh
;
1983 mntfh
->size
= data
->root
.size
;
1986 mntfh
->size
= NFS2_FHSIZE
;
1991 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1992 if (mntfh
->size
< sizeof(mntfh
->data
))
1993 memset(mntfh
->data
+ mntfh
->size
, 0,
1994 sizeof(mntfh
->data
) - mntfh
->size
);
1997 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2000 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
2001 args
->flags
|= extra_flags
;
2002 args
->rsize
= data
->rsize
;
2003 args
->wsize
= data
->wsize
;
2004 args
->timeo
= data
->timeo
;
2005 args
->retrans
= data
->retrans
;
2006 args
->acregmin
= data
->acregmin
;
2007 args
->acregmax
= data
->acregmax
;
2008 args
->acdirmin
= data
->acdirmin
;
2009 args
->acdirmax
= data
->acdirmax
;
2010 args
->need_mount
= false;
2012 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
2013 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
2014 args
->nfs_server
.port
= ntohs(data
->addr
.sin_port
);
2015 if (!nfs_verify_server_address(sap
))
2016 goto out_no_address
;
2018 if (!(data
->flags
& NFS_MOUNT_TCP
))
2019 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
2020 /* N.B. caller will free nfs_server.hostname in all cases */
2021 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
2022 args
->namlen
= data
->namlen
;
2023 args
->bsize
= data
->bsize
;
2025 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
2026 args
->selected_flavor
= data
->pseudoflavor
;
2028 args
->selected_flavor
= RPC_AUTH_UNIX
;
2029 if (!args
->nfs_server
.hostname
)
2032 if (!(data
->flags
& NFS_MOUNT_NONLM
))
2033 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
2034 NFS_MOUNT_LOCAL_FCNTL
);
2036 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
2037 NFS_MOUNT_LOCAL_FCNTL
);
2039 * The legacy version 6 binary mount data from userspace has a
2040 * field used only to transport selinux information into the
2041 * the kernel. To continue to support that functionality we
2042 * have a touch of selinux knowledge here in the NFS code. The
2043 * userspace code converted context=blah to just blah so we are
2044 * converting back to the full string selinux understands.
2046 if (data
->context
[0]){
2047 #ifdef CONFIG_SECURITY_SELINUX
2049 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
2052 strcpy(opts_str
, "context=");
2053 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
2054 strcat(opts_str
, &data
->context
[0]);
2055 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
2066 return NFS_TEXT_DATA
;
2069 #if !IS_ENABLED(CONFIG_NFS_V3)
2070 if (args
->version
== 3)
2071 goto out_v3_not_compiled
;
2072 #endif /* !CONFIG_NFS_V3 */
2077 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
2081 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
2086 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2089 #if !IS_ENABLED(CONFIG_NFS_V3)
2090 out_v3_not_compiled
:
2091 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
2092 return -EPROTONOSUPPORT
;
2093 #endif /* !CONFIG_NFS_V3 */
2096 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
2100 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2104 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
2108 #if IS_ENABLED(CONFIG_NFS_V4)
2109 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
2111 struct nfs_parsed_mount_data
*args
,
2112 struct nfs_fh
*mntfh
,
2113 const char *dev_name
)
2115 if (fs_type
== &nfs_fs_type
)
2116 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2117 return nfs4_validate_mount_data(options
, args
, dev_name
);
2120 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
2122 struct nfs_parsed_mount_data
*args
,
2123 struct nfs_fh
*mntfh
,
2124 const char *dev_name
)
2126 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2130 static int nfs_validate_text_mount_data(void *options
,
2131 struct nfs_parsed_mount_data
*args
,
2132 const char *dev_name
)
2135 int max_namelen
= PAGE_SIZE
;
2136 int max_pathlen
= NFS_MAXPATHLEN
;
2137 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2139 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2142 if (!nfs_verify_server_address(sap
))
2143 goto out_no_address
;
2145 if (args
->version
== 4) {
2146 #if IS_ENABLED(CONFIG_NFS_V4)
2148 max_namelen
= NFS4_MAXNAMLEN
;
2149 max_pathlen
= NFS4_MAXPATHLEN
;
2150 nfs_validate_transport_protocol(args
);
2151 if (args
->nfs_server
.protocol
== XPRT_TRANSPORT_UDP
)
2152 goto out_invalid_transport_udp
;
2153 nfs4_validate_mount_flags(args
);
2155 goto out_v4_not_compiled
;
2156 #endif /* CONFIG_NFS_V4 */
2158 nfs_set_mount_transport_protocol(args
);
2160 nfs_set_port(sap
, &args
->nfs_server
.port
, port
);
2162 return nfs_parse_devname(dev_name
,
2163 &args
->nfs_server
.hostname
,
2165 &args
->nfs_server
.export_path
,
2168 #if !IS_ENABLED(CONFIG_NFS_V4)
2169 out_v4_not_compiled
:
2170 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2171 return -EPROTONOSUPPORT
;
2173 out_invalid_transport_udp
:
2174 dfprintk(MOUNT
, "NFSv4: Unsupported transport protocol udp\n");
2176 #endif /* !CONFIG_NFS_V4 */
2179 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2184 nfs_compare_remount_data(struct nfs_server
*nfss
,
2185 struct nfs_parsed_mount_data
*data
)
2187 if (data
->flags
!= nfss
->flags
||
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
;
2219 * Userspace mount programs that send binary options generally send
2220 * them populated with default values. We have no way to know which
2221 * ones were explicitly specified. Fall back to legacy behavior and
2222 * just return success.
2224 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2225 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2226 options
->version
<= 6))))
2229 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2233 /* fill out struct with values from existing mount */
2234 data
->flags
= nfss
->flags
;
2235 data
->rsize
= nfss
->rsize
;
2236 data
->wsize
= nfss
->wsize
;
2237 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2238 data
->selected_flavor
= nfss
->client
->cl_auth
->au_flavor
;
2239 data
->auth_info
= nfss
->auth_info
;
2240 data
->acregmin
= nfss
->acregmin
/ HZ
;
2241 data
->acregmax
= nfss
->acregmax
/ HZ
;
2242 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2243 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2244 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2245 data
->nfs_server
.port
= nfss
->port
;
2246 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2247 data
->version
= nfsvers
;
2248 data
->minorversion
= nfss
->nfs_client
->cl_minorversion
;
2249 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2250 data
->nfs_server
.addrlen
);
2252 /* overwrite those values with any that were specified */
2254 if (!nfs_parse_mount_options((char *)options
, data
))
2258 * noac is a special case. It implies -o sync, but that's not
2259 * necessarily reflected in the mtab options. do_remount_sb
2260 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2261 * remount options, so we have to explicitly reset it.
2263 if (data
->flags
& NFS_MOUNT_NOAC
)
2264 *flags
|= MS_SYNCHRONOUS
;
2266 /* compare new mount options with old ones */
2267 error
= nfs_compare_remount_data(nfss
, data
);
2272 EXPORT_SYMBOL_GPL(nfs_remount
);
2275 * Initialise the common bits of the superblock
2277 inline void nfs_initialise_sb(struct super_block
*sb
)
2279 struct nfs_server
*server
= NFS_SB(sb
);
2281 sb
->s_magic
= NFS_SUPER_MAGIC
;
2283 /* We probably want something more informative here */
2284 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2285 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2287 if (sb
->s_blocksize
== 0)
2288 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2289 &sb
->s_blocksize_bits
);
2291 sb
->s_bdi
= &server
->backing_dev_info
;
2293 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2297 * Finish setting up an NFS2/3 superblock
2299 void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2301 struct nfs_parsed_mount_data
*data
= mount_info
->parsed
;
2302 struct nfs_server
*server
= NFS_SB(sb
);
2304 sb
->s_blocksize_bits
= 0;
2305 sb
->s_blocksize
= 0;
2306 sb
->s_xattr
= server
->nfs_client
->cl_nfs_mod
->xattr
;
2307 sb
->s_op
= server
->nfs_client
->cl_nfs_mod
->sops
;
2308 if (data
&& data
->bsize
)
2309 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2311 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2312 /* The VFS shouldn't apply the umask to mode bits. We will do
2313 * so ourselves when necessary.
2315 sb
->s_flags
|= MS_POSIXACL
;
2316 sb
->s_time_gran
= 1;
2319 nfs_initialise_sb(sb
);
2321 EXPORT_SYMBOL_GPL(nfs_fill_super
);
2324 * Finish setting up a cloned NFS2/3/4 superblock
2326 void nfs_clone_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2328 const struct super_block
*old_sb
= mount_info
->cloned
->sb
;
2329 struct nfs_server
*server
= NFS_SB(sb
);
2331 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2332 sb
->s_blocksize
= old_sb
->s_blocksize
;
2333 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2334 sb
->s_xattr
= old_sb
->s_xattr
;
2335 sb
->s_op
= old_sb
->s_op
;
2336 sb
->s_time_gran
= 1;
2338 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2339 /* The VFS shouldn't apply the umask to mode bits. We will do
2340 * so ourselves when necessary.
2342 sb
->s_flags
|= MS_POSIXACL
;
2345 nfs_initialise_sb(sb
);
2348 #define NFS_MOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2349 | NFS_MOUNT_SECURE \
2352 | NFS_MOUNT_KERBEROS \
2354 | NFS_MOUNT_BROKEN_SUID \
2355 | NFS_MOUNT_STRICTLOCK \
2356 | NFS_MOUNT_UNSHARED \
2357 | NFS_MOUNT_NORESVPORT \
2358 | NFS_MOUNT_LEGACY_INTERFACE)
2360 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2362 const struct nfs_server
*a
= s
->s_fs_info
;
2363 const struct rpc_clnt
*clnt_a
= a
->client
;
2364 const struct rpc_clnt
*clnt_b
= b
->client
;
2366 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2368 if (a
->nfs_client
!= b
->nfs_client
)
2370 if ((a
->flags
^ b
->flags
) & NFS_MOUNT_CMP_FLAGMASK
)
2372 if (a
->wsize
!= b
->wsize
)
2374 if (a
->rsize
!= b
->rsize
)
2376 if (a
->acregmin
!= b
->acregmin
)
2378 if (a
->acregmax
!= b
->acregmax
)
2380 if (a
->acdirmin
!= b
->acdirmin
)
2382 if (a
->acdirmax
!= b
->acdirmax
)
2384 if (b
->auth_info
.flavor_len
> 0 &&
2385 clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2392 struct nfs_sb_mountdata
{
2393 struct nfs_server
*server
;
2397 static int nfs_set_super(struct super_block
*s
, void *data
)
2399 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2400 struct nfs_server
*server
= sb_mntdata
->server
;
2403 s
->s_flags
= sb_mntdata
->mntflags
;
2404 s
->s_fs_info
= server
;
2405 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2406 ret
= set_anon_super(s
, server
);
2408 server
->s_dev
= s
->s_dev
;
2412 static int nfs_compare_super_address(struct nfs_server
*server1
,
2413 struct nfs_server
*server2
)
2415 struct sockaddr
*sap1
, *sap2
;
2417 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2418 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2420 if (sap1
->sa_family
!= sap2
->sa_family
)
2423 switch (sap1
->sa_family
) {
2425 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2426 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2427 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2429 if (sin1
->sin_port
!= sin2
->sin_port
)
2434 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2435 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2436 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2438 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2449 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2451 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2452 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2453 int mntflags
= sb_mntdata
->mntflags
;
2455 if (!nfs_compare_super_address(old
, server
))
2457 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2458 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2460 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2462 return nfs_compare_mount_options(sb
, server
, mntflags
);
2465 #ifdef CONFIG_NFS_FSCACHE
2466 static void nfs_get_cache_cookie(struct super_block
*sb
,
2467 struct nfs_parsed_mount_data
*parsed
,
2468 struct nfs_clone_mount
*cloned
)
2470 struct nfs_server
*nfss
= NFS_SB(sb
);
2474 nfss
->fscache_key
= NULL
;
2475 nfss
->fscache
= NULL
;
2478 if (!(parsed
->options
& NFS_OPTION_FSCACHE
))
2480 if (parsed
->fscache_uniq
) {
2481 uniq
= parsed
->fscache_uniq
;
2482 ulen
= strlen(parsed
->fscache_uniq
);
2484 } else if (cloned
) {
2485 struct nfs_server
*mnt_s
= NFS_SB(cloned
->sb
);
2486 if (!(mnt_s
->options
& NFS_OPTION_FSCACHE
))
2488 if (mnt_s
->fscache_key
) {
2489 uniq
= mnt_s
->fscache_key
->key
.uniquifier
;
2490 ulen
= mnt_s
->fscache_key
->key
.uniq_len
;
2495 nfs_fscache_get_super_cookie(sb
, uniq
, ulen
);
2498 static void nfs_get_cache_cookie(struct super_block
*sb
,
2499 struct nfs_parsed_mount_data
*parsed
,
2500 struct nfs_clone_mount
*cloned
)
2505 static int nfs_bdi_register(struct nfs_server
*server
)
2507 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2510 int nfs_set_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2511 struct nfs_mount_info
*mount_info
)
2514 unsigned long kflags
= 0, kflags_out
= 0;
2515 if (NFS_SB(s
)->caps
& NFS_CAP_SECURITY_LABEL
)
2516 kflags
|= SECURITY_LSM_NATIVE_LABELS
;
2518 error
= security_sb_set_mnt_opts(s
, &mount_info
->parsed
->lsm_opts
,
2519 kflags
, &kflags_out
);
2523 if (NFS_SB(s
)->caps
& NFS_CAP_SECURITY_LABEL
&&
2524 !(kflags_out
& SECURITY_LSM_NATIVE_LABELS
))
2525 NFS_SB(s
)->caps
&= ~NFS_CAP_SECURITY_LABEL
;
2529 EXPORT_SYMBOL_GPL(nfs_set_sb_security
);
2531 int nfs_clone_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2532 struct nfs_mount_info
*mount_info
)
2534 /* clone any lsm security options from the parent to the new sb */
2535 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
)
2537 return security_sb_clone_mnt_opts(mount_info
->cloned
->sb
, s
);
2539 EXPORT_SYMBOL_GPL(nfs_clone_sb_security
);
2541 struct dentry
*nfs_fs_mount_common(struct nfs_server
*server
,
2542 int flags
, const char *dev_name
,
2543 struct nfs_mount_info
*mount_info
,
2544 struct nfs_subversion
*nfs_mod
)
2546 struct super_block
*s
;
2547 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2548 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2549 struct nfs_sb_mountdata sb_mntdata
= {
2555 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2556 compare_super
= NULL
;
2558 /* -o noac implies -o sync */
2559 if (server
->flags
& NFS_MOUNT_NOAC
)
2560 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2562 if (mount_info
->cloned
!= NULL
&& mount_info
->cloned
->sb
!= NULL
)
2563 if (mount_info
->cloned
->sb
->s_flags
& MS_SYNCHRONOUS
)
2564 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2566 /* Get a superblock - note that we may end up sharing one that already exists */
2567 s
= sget(nfs_mod
->nfs_fs
, compare_super
, nfs_set_super
, flags
, &sb_mntdata
);
2569 mntroot
= ERR_CAST(s
);
2573 if (s
->s_fs_info
!= server
) {
2574 nfs_free_server(server
);
2577 error
= nfs_bdi_register(server
);
2579 mntroot
= ERR_PTR(error
);
2580 goto error_splat_bdi
;
2586 /* initial superblock/root creation */
2587 mount_info
->fill_super(s
, mount_info
);
2588 nfs_get_cache_cookie(s
, mount_info
->parsed
, mount_info
->cloned
);
2591 mntroot
= nfs_get_root(s
, mount_info
->mntfh
, dev_name
);
2592 if (IS_ERR(mntroot
))
2593 goto error_splat_super
;
2595 error
= mount_info
->set_security(s
, mntroot
, mount_info
);
2597 goto error_splat_root
;
2599 s
->s_flags
|= MS_ACTIVE
;
2605 nfs_free_server(server
);
2610 mntroot
= ERR_PTR(error
);
2612 if (server
&& !s
->s_root
)
2613 bdi_unregister(&server
->backing_dev_info
);
2615 deactivate_locked_super(s
);
2618 EXPORT_SYMBOL_GPL(nfs_fs_mount_common
);
2620 struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2621 int flags
, const char *dev_name
, void *raw_data
)
2623 struct nfs_mount_info mount_info
= {
2624 .fill_super
= nfs_fill_super
,
2625 .set_security
= nfs_set_sb_security
,
2627 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2628 struct nfs_subversion
*nfs_mod
;
2631 mount_info
.parsed
= nfs_alloc_parsed_mount_data();
2632 mount_info
.mntfh
= nfs_alloc_fhandle();
2633 if (mount_info
.parsed
== NULL
|| mount_info
.mntfh
== NULL
)
2636 /* Validate the mount data */
2637 error
= nfs_validate_mount_data(fs_type
, raw_data
, mount_info
.parsed
, mount_info
.mntfh
, dev_name
);
2638 if (error
== NFS_TEXT_DATA
)
2639 error
= nfs_validate_text_mount_data(raw_data
, mount_info
.parsed
, dev_name
);
2641 mntroot
= ERR_PTR(error
);
2645 nfs_mod
= get_nfs_version(mount_info
.parsed
->version
);
2646 if (IS_ERR(nfs_mod
)) {
2647 mntroot
= ERR_CAST(nfs_mod
);
2651 mntroot
= nfs_mod
->rpc_ops
->try_mount(flags
, dev_name
, &mount_info
, nfs_mod
);
2653 put_nfs_version(nfs_mod
);
2655 nfs_free_parsed_mount_data(mount_info
.parsed
);
2656 nfs_free_fhandle(mount_info
.mntfh
);
2659 EXPORT_SYMBOL_GPL(nfs_fs_mount
);
2662 * Ensure that we unregister the bdi before kill_anon_super
2663 * releases the device name
2665 void nfs_put_super(struct super_block
*s
)
2667 struct nfs_server
*server
= NFS_SB(s
);
2669 bdi_unregister(&server
->backing_dev_info
);
2671 EXPORT_SYMBOL_GPL(nfs_put_super
);
2674 * Destroy an NFS2/3 superblock
2676 void nfs_kill_super(struct super_block
*s
)
2678 struct nfs_server
*server
= NFS_SB(s
);
2681 nfs_fscache_release_super_cookie(s
);
2682 nfs_free_server(server
);
2684 EXPORT_SYMBOL_GPL(nfs_kill_super
);
2687 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2689 static struct dentry
*
2690 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2691 const char *dev_name
, void *raw_data
)
2693 struct nfs_clone_mount
*data
= raw_data
;
2694 struct nfs_mount_info mount_info
= {
2695 .fill_super
= nfs_clone_super
,
2696 .set_security
= nfs_clone_sb_security
,
2699 struct nfs_server
*server
;
2700 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2701 struct nfs_subversion
*nfs_mod
= NFS_SB(data
->sb
)->nfs_client
->cl_nfs_mod
;
2703 dprintk("--> nfs_xdev_mount()\n");
2705 mount_info
.mntfh
= mount_info
.cloned
->fh
;
2707 /* create a new volume representation */
2708 server
= nfs_mod
->rpc_ops
->clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2711 mntroot
= ERR_CAST(server
);
2713 mntroot
= nfs_fs_mount_common(server
, flags
,
2714 dev_name
, &mount_info
, nfs_mod
);
2716 dprintk("<-- nfs_xdev_mount() = %ld\n",
2717 IS_ERR(mntroot
) ? PTR_ERR(mntroot
) : 0L);
2721 #if IS_ENABLED(CONFIG_NFS_V4)
2723 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2725 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2726 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2730 * Validate NFSv4 mount options
2732 static int nfs4_validate_mount_data(void *options
,
2733 struct nfs_parsed_mount_data
*args
,
2734 const char *dev_name
)
2736 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2737 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2745 switch (data
->version
) {
2747 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2748 goto out_no_address
;
2749 if (data
->host_addrlen
== 0)
2750 goto out_no_address
;
2751 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2752 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2754 if (!nfs_verify_server_address(sap
))
2755 goto out_no_address
;
2756 args
->nfs_server
.port
= ntohs(((struct sockaddr_in
*)sap
)->sin_port
);
2758 if (data
->auth_flavourlen
) {
2759 rpc_authflavor_t pseudoflavor
;
2760 if (data
->auth_flavourlen
> 1)
2761 goto out_inval_auth
;
2762 if (copy_from_user(&pseudoflavor
,
2763 data
->auth_flavours
,
2764 sizeof(pseudoflavor
)))
2766 args
->selected_flavor
= pseudoflavor
;
2768 args
->selected_flavor
= RPC_AUTH_UNIX
;
2770 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2773 args
->nfs_server
.hostname
= c
;
2775 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2778 args
->nfs_server
.export_path
= c
;
2779 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2781 c
= strndup_user(data
->client_addr
.data
, 16);
2784 args
->client_address
= c
;
2787 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2791 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2792 args
->rsize
= data
->rsize
;
2793 args
->wsize
= data
->wsize
;
2794 args
->timeo
= data
->timeo
;
2795 args
->retrans
= data
->retrans
;
2796 args
->acregmin
= data
->acregmin
;
2797 args
->acregmax
= data
->acregmax
;
2798 args
->acdirmin
= data
->acdirmin
;
2799 args
->acdirmax
= data
->acdirmax
;
2800 args
->nfs_server
.protocol
= data
->proto
;
2801 nfs_validate_transport_protocol(args
);
2802 if (args
->nfs_server
.protocol
== XPRT_TRANSPORT_UDP
)
2803 goto out_invalid_transport_udp
;
2807 return NFS_TEXT_DATA
;
2813 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2817 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2818 data
->auth_flavourlen
);
2822 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2825 out_invalid_transport_udp
:
2826 dfprintk(MOUNT
, "NFSv4: Unsupported transport protocol udp\n");
2831 * NFS v4 module parameters need to stay in the
2832 * NFS client for backwards compatibility
2834 unsigned int nfs_callback_set_tcpport
;
2835 unsigned short nfs_callback_tcpport
;
2836 /* Default cache timeout is 10 minutes */
2837 unsigned int nfs_idmap_cache_timeout
= 600;
2838 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2839 bool nfs4_disable_idmapping
= true;
2840 unsigned short max_session_slots
= NFS4_DEF_SLOT_TABLE_SIZE
;
2841 unsigned short send_implementation_id
= 1;
2842 char nfs4_client_id_uniquifier
[NFS4_CLIENT_ID_UNIQ_LEN
] = "";
2843 bool recover_lost_locks
= false;
2845 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport
);
2846 EXPORT_SYMBOL_GPL(nfs_callback_tcpport
);
2847 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout
);
2848 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping
);
2849 EXPORT_SYMBOL_GPL(max_session_slots
);
2850 EXPORT_SYMBOL_GPL(send_implementation_id
);
2851 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier
);
2852 EXPORT_SYMBOL_GPL(recover_lost_locks
);
2854 #define NFS_CALLBACK_MAXPORTNR (65535U)
2856 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2863 ret
= kstrtoul(val
, 0, &num
);
2864 if (ret
== -EINVAL
|| num
> NFS_CALLBACK_MAXPORTNR
)
2866 *((unsigned int *)kp
->arg
) = num
;
2869 static struct kernel_param_ops param_ops_portnr
= {
2870 .set
= param_set_portnr
,
2871 .get
= param_get_uint
,
2873 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2875 module_param_named(callback_tcpport
, nfs_callback_set_tcpport
, portnr
, 0644);
2876 module_param(nfs_idmap_cache_timeout
, int, 0644);
2877 module_param(nfs4_disable_idmapping
, bool, 0644);
2878 module_param_string(nfs4_unique_id
, nfs4_client_id_uniquifier
,
2879 NFS4_CLIENT_ID_UNIQ_LEN
, 0600);
2880 MODULE_PARM_DESC(nfs4_disable_idmapping
,
2881 "Turn off NFSv4 idmapping when using 'sec=sys'");
2882 module_param(max_session_slots
, ushort
, 0644);
2883 MODULE_PARM_DESC(max_session_slots
, "Maximum number of outstanding NFSv4.1 "
2884 "requests the client will negotiate");
2885 module_param(send_implementation_id
, ushort
, 0644);
2886 MODULE_PARM_DESC(send_implementation_id
,
2887 "Send implementation ID with NFSv4.1 exchange_id");
2888 MODULE_PARM_DESC(nfs4_unique_id
, "nfs_client_id4 uniquifier string");
2890 module_param(recover_lost_locks
, bool, 0644);
2891 MODULE_PARM_DESC(recover_lost_locks
,
2892 "If the server reports that a lock might be lost, "
2893 "try to recover it risking data corruption.");
2896 #endif /* CONFIG_NFS_V4 */