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/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
69 #define NFSDBG_FACILITY NFSDBG_VFS
70 #define NFS_TEXT_DATA 1
72 #if IS_ENABLED(CONFIG_NFS_V3)
73 #define NFS_DEFAULT_VERSION 3
75 #define NFS_DEFAULT_VERSION 2
79 /* Mount options that take no arguments */
81 Opt_posix
, Opt_noposix
,
85 Opt_udp
, Opt_tcp
, Opt_rdma
,
87 Opt_rdirplus
, Opt_nordirplus
,
88 Opt_sharecache
, Opt_nosharecache
,
89 Opt_resvport
, Opt_noresvport
,
90 Opt_fscache
, Opt_nofscache
,
92 /* Mount options that take integer arguments */
94 Opt_rsize
, Opt_wsize
, Opt_bsize
,
95 Opt_timeo
, Opt_retrans
,
96 Opt_acregmin
, Opt_acregmax
,
97 Opt_acdirmin
, Opt_acdirmax
,
104 /* Mount options that take string arguments */
106 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
107 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
112 /* Special mount options */
113 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
118 static const match_table_t nfs_mount_option_tokens
= {
119 { Opt_userspace
, "bg" },
120 { Opt_userspace
, "fg" },
121 { Opt_userspace
, "retry=%s" },
123 { Opt_sloppy
, "sloppy" },
125 { Opt_soft
, "soft" },
126 { Opt_hard
, "hard" },
127 { Opt_deprecated
, "intr" },
128 { Opt_deprecated
, "nointr" },
129 { Opt_posix
, "posix" },
130 { Opt_noposix
, "noposix" },
132 { Opt_nocto
, "nocto" },
134 { Opt_noac
, "noac" },
135 { Opt_lock
, "lock" },
136 { Opt_nolock
, "nolock" },
139 { Opt_rdma
, "rdma" },
141 { Opt_noacl
, "noacl" },
142 { Opt_rdirplus
, "rdirplus" },
143 { Opt_nordirplus
, "nordirplus" },
144 { Opt_sharecache
, "sharecache" },
145 { Opt_nosharecache
, "nosharecache" },
146 { Opt_resvport
, "resvport" },
147 { Opt_noresvport
, "noresvport" },
148 { Opt_fscache
, "fsc" },
149 { Opt_nofscache
, "nofsc" },
151 { Opt_port
, "port=%s" },
152 { Opt_rsize
, "rsize=%s" },
153 { Opt_wsize
, "wsize=%s" },
154 { Opt_bsize
, "bsize=%s" },
155 { Opt_timeo
, "timeo=%s" },
156 { Opt_retrans
, "retrans=%s" },
157 { Opt_acregmin
, "acregmin=%s" },
158 { Opt_acregmax
, "acregmax=%s" },
159 { Opt_acdirmin
, "acdirmin=%s" },
160 { Opt_acdirmax
, "acdirmax=%s" },
161 { Opt_actimeo
, "actimeo=%s" },
162 { Opt_namelen
, "namlen=%s" },
163 { Opt_mountport
, "mountport=%s" },
164 { Opt_mountvers
, "mountvers=%s" },
165 { Opt_minorversion
, "minorversion=%s" },
167 { Opt_nfsvers
, "nfsvers=%s" },
168 { Opt_nfsvers
, "vers=%s" },
170 { Opt_sec
, "sec=%s" },
171 { Opt_proto
, "proto=%s" },
172 { Opt_mountproto
, "mountproto=%s" },
173 { Opt_addr
, "addr=%s" },
174 { Opt_clientaddr
, "clientaddr=%s" },
175 { Opt_mounthost
, "mounthost=%s" },
176 { Opt_mountaddr
, "mountaddr=%s" },
178 { Opt_lookupcache
, "lookupcache=%s" },
179 { Opt_fscache_uniq
, "fsc=%s" },
180 { Opt_local_lock
, "local_lock=%s" },
182 /* The following needs to be listed after all other options */
183 { Opt_nfsvers
, "v%s" },
189 Opt_xprt_udp
, Opt_xprt_udp6
, Opt_xprt_tcp
, Opt_xprt_tcp6
, Opt_xprt_rdma
,
194 static const match_table_t nfs_xprt_protocol_tokens
= {
195 { Opt_xprt_udp
, "udp" },
196 { Opt_xprt_udp6
, "udp6" },
197 { Opt_xprt_tcp
, "tcp" },
198 { Opt_xprt_tcp6
, "tcp6" },
199 { Opt_xprt_rdma
, "rdma" },
201 { Opt_xprt_err
, NULL
}
205 Opt_sec_none
, Opt_sec_sys
,
206 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
207 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
208 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
213 static const match_table_t nfs_secflavor_tokens
= {
214 { Opt_sec_none
, "none" },
215 { Opt_sec_none
, "null" },
216 { Opt_sec_sys
, "sys" },
218 { Opt_sec_krb5
, "krb5" },
219 { Opt_sec_krb5i
, "krb5i" },
220 { Opt_sec_krb5p
, "krb5p" },
222 { Opt_sec_lkey
, "lkey" },
223 { Opt_sec_lkeyi
, "lkeyi" },
224 { Opt_sec_lkeyp
, "lkeyp" },
226 { Opt_sec_spkm
, "spkm3" },
227 { Opt_sec_spkmi
, "spkm3i" },
228 { Opt_sec_spkmp
, "spkm3p" },
230 { Opt_sec_err
, NULL
}
234 Opt_lookupcache_all
, Opt_lookupcache_positive
,
235 Opt_lookupcache_none
,
240 static match_table_t nfs_lookupcache_tokens
= {
241 { Opt_lookupcache_all
, "all" },
242 { Opt_lookupcache_positive
, "pos" },
243 { Opt_lookupcache_positive
, "positive" },
244 { Opt_lookupcache_none
, "none" },
246 { Opt_lookupcache_err
, NULL
}
250 Opt_local_lock_all
, Opt_local_lock_flock
, Opt_local_lock_posix
,
256 static match_table_t nfs_local_lock_tokens
= {
257 { Opt_local_lock_all
, "all" },
258 { Opt_local_lock_flock
, "flock" },
259 { Opt_local_lock_posix
, "posix" },
260 { Opt_local_lock_none
, "none" },
262 { Opt_local_lock_err
, NULL
}
266 Opt_vers_2
, Opt_vers_3
, Opt_vers_4
, Opt_vers_4_0
,
272 static match_table_t nfs_vers_tokens
= {
276 { Opt_vers_4_0
, "4.0" },
277 { Opt_vers_4_1
, "4.1" },
279 { Opt_vers_err
, NULL
}
282 static struct dentry
*nfs_xdev_mount(struct file_system_type
*fs_type
,
283 int flags
, const char *dev_name
, void *raw_data
);
285 struct file_system_type nfs_fs_type
= {
286 .owner
= THIS_MODULE
,
288 .mount
= nfs_fs_mount
,
289 .kill_sb
= nfs_kill_super
,
290 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
292 EXPORT_SYMBOL_GPL(nfs_fs_type
);
294 struct file_system_type nfs_xdev_fs_type
= {
295 .owner
= THIS_MODULE
,
297 .mount
= nfs_xdev_mount
,
298 .kill_sb
= nfs_kill_super
,
299 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
302 const struct super_operations nfs_sops
= {
303 .alloc_inode
= nfs_alloc_inode
,
304 .destroy_inode
= nfs_destroy_inode
,
305 .write_inode
= nfs_write_inode
,
306 .put_super
= nfs_put_super
,
307 .statfs
= nfs_statfs
,
308 .evict_inode
= nfs_evict_inode
,
309 .umount_begin
= nfs_umount_begin
,
310 .show_options
= nfs_show_options
,
311 .show_devname
= nfs_show_devname
,
312 .show_path
= nfs_show_path
,
313 .show_stats
= nfs_show_stats
,
314 .remount_fs
= nfs_remount
,
316 EXPORT_SYMBOL_GPL(nfs_sops
);
318 #if IS_ENABLED(CONFIG_NFS_V4)
319 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*);
320 static int nfs4_validate_mount_data(void *options
,
321 struct nfs_parsed_mount_data
*args
, const char *dev_name
);
323 struct file_system_type nfs4_fs_type
= {
324 .owner
= THIS_MODULE
,
326 .mount
= nfs_fs_mount
,
327 .kill_sb
= nfs_kill_super
,
328 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
330 EXPORT_SYMBOL_GPL(nfs4_fs_type
);
332 static int __init
register_nfs4_fs(void)
334 return register_filesystem(&nfs4_fs_type
);
337 static void unregister_nfs4_fs(void)
339 unregister_filesystem(&nfs4_fs_type
);
342 static int __init
register_nfs4_fs(void)
347 static void unregister_nfs4_fs(void)
352 static struct shrinker acl_shrinker
= {
353 .shrink
= nfs_access_cache_shrinker
,
354 .seeks
= DEFAULT_SEEKS
,
358 * Register the NFS filesystems
360 int __init
register_nfs_fs(void)
364 ret
= register_filesystem(&nfs_fs_type
);
368 ret
= register_nfs4_fs();
372 ret
= nfs_register_sysctl();
375 register_shrinker(&acl_shrinker
);
379 unregister_nfs4_fs();
381 unregister_filesystem(&nfs_fs_type
);
387 * Unregister the NFS filesystems
389 void __exit
unregister_nfs_fs(void)
391 unregister_shrinker(&acl_shrinker
);
392 nfs_unregister_sysctl();
393 unregister_nfs4_fs();
394 unregister_filesystem(&nfs_fs_type
);
397 void nfs_sb_active(struct super_block
*sb
)
399 struct nfs_server
*server
= NFS_SB(sb
);
401 if (atomic_inc_return(&server
->active
) == 1)
402 atomic_inc(&sb
->s_active
);
404 EXPORT_SYMBOL_GPL(nfs_sb_active
);
406 void nfs_sb_deactive(struct super_block
*sb
)
408 struct nfs_server
*server
= NFS_SB(sb
);
410 if (atomic_dec_and_test(&server
->active
))
411 deactivate_super(sb
);
413 EXPORT_SYMBOL_GPL(nfs_sb_deactive
);
416 * Deliver file system statistics to userspace
418 int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
420 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
421 unsigned char blockbits
;
422 unsigned long blockres
;
423 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
424 struct nfs_fsstat res
;
427 res
.fattr
= nfs_alloc_fattr();
428 if (res
.fattr
== NULL
)
431 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
432 if (unlikely(error
== -ESTALE
)) {
433 struct dentry
*pd_dentry
;
435 pd_dentry
= dget_parent(dentry
);
436 if (pd_dentry
!= NULL
) {
437 nfs_zap_caches(pd_dentry
->d_inode
);
441 nfs_free_fattr(res
.fattr
);
445 buf
->f_type
= NFS_SUPER_MAGIC
;
448 * Current versions of glibc do not correctly handle the
449 * case where f_frsize != f_bsize. Eventually we want to
450 * report the value of wtmult in this field.
452 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
455 * On most *nix systems, f_blocks, f_bfree, and f_bavail
456 * are reported in units of f_frsize. Linux hasn't had
457 * an f_frsize field in its statfs struct until recently,
458 * thus historically Linux's sys_statfs reports these
459 * fields in units of f_bsize.
461 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
462 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
463 blockres
= (1 << blockbits
) - 1;
464 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
465 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
466 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
468 buf
->f_files
= res
.tfiles
;
469 buf
->f_ffree
= res
.afiles
;
471 buf
->f_namelen
= server
->namelen
;
476 dprintk("%s: statfs error = %d\n", __func__
, -error
);
479 EXPORT_SYMBOL_GPL(nfs_statfs
);
482 * Map the security flavour number to a name
484 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
486 static const struct {
487 rpc_authflavor_t flavour
;
490 { RPC_AUTH_NULL
, "null" },
491 { RPC_AUTH_UNIX
, "sys" },
492 { RPC_AUTH_GSS_KRB5
, "krb5" },
493 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
494 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
495 { RPC_AUTH_GSS_LKEY
, "lkey" },
496 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
497 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
498 { RPC_AUTH_GSS_SPKM
, "spkm" },
499 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
500 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
501 { UINT_MAX
, "unknown" }
505 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
506 if (sec_flavours
[i
].flavour
== flavour
)
509 return sec_flavours
[i
].str
;
512 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
515 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
517 seq_printf(m
, ",mountproto=");
518 switch (sap
->sa_family
) {
520 switch (nfss
->mountd_protocol
) {
522 seq_printf(m
, RPCBIND_NETID_UDP
);
525 seq_printf(m
, RPCBIND_NETID_TCP
);
529 seq_printf(m
, "auto");
533 switch (nfss
->mountd_protocol
) {
535 seq_printf(m
, RPCBIND_NETID_UDP6
);
538 seq_printf(m
, RPCBIND_NETID_TCP6
);
542 seq_printf(m
, "auto");
547 seq_printf(m
, "auto");
551 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
554 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
556 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
559 switch (sap
->sa_family
) {
561 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
562 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
566 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
567 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
572 seq_printf(m
, ",mountaddr=unspecified");
575 if (nfss
->mountd_version
|| showdefaults
)
576 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
577 if ((nfss
->mountd_port
&&
578 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
580 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
582 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
585 #if IS_ENABLED(CONFIG_NFS_V4)
586 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
589 struct nfs_client
*clp
= nfss
->nfs_client
;
591 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
594 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
600 static void nfs_show_nfs_version(struct seq_file
*m
,
601 unsigned int version
,
602 unsigned int minorversion
)
604 seq_printf(m
, ",vers=%u", version
);
606 seq_printf(m
, ".%u", minorversion
);
610 * Describe the mount options in force on this server representation
612 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
615 static const struct proc_nfs_info
{
620 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
621 { NFS_MOUNT_POSIX
, ",posix", "" },
622 { NFS_MOUNT_NOCTO
, ",nocto", "" },
623 { NFS_MOUNT_NOAC
, ",noac", "" },
624 { NFS_MOUNT_NONLM
, ",nolock", "" },
625 { NFS_MOUNT_NOACL
, ",noacl", "" },
626 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
627 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
628 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
631 const struct proc_nfs_info
*nfs_infop
;
632 struct nfs_client
*clp
= nfss
->nfs_client
;
633 u32 version
= clp
->rpc_ops
->version
;
634 int local_flock
, local_fcntl
;
636 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
637 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
638 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
639 if (nfss
->bsize
!= 0)
640 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
641 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
642 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
643 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
644 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
645 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
646 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
647 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
648 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
649 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
650 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
651 if (nfss
->flags
& nfs_infop
->flag
)
652 seq_puts(m
, nfs_infop
->str
);
654 seq_puts(m
, nfs_infop
->nostr
);
657 seq_printf(m
, ",proto=%s",
658 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
661 if (nfss
->port
!= NFS_PORT
)
662 seq_printf(m
, ",port=%u", nfss
->port
);
665 seq_printf(m
, ",port=%u", nfss
->port
);
667 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
668 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
669 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
672 nfs_show_mountd_options(m
, nfss
, showdefaults
);
674 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
676 if (nfss
->options
& NFS_OPTION_FSCACHE
)
677 seq_printf(m
, ",fsc");
679 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
680 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
681 seq_printf(m
, ",lookupcache=none");
683 seq_printf(m
, ",lookupcache=pos");
686 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
687 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
689 if (!local_flock
&& !local_fcntl
)
690 seq_printf(m
, ",local_lock=none");
691 else if (local_flock
&& local_fcntl
)
692 seq_printf(m
, ",local_lock=all");
693 else if (local_flock
)
694 seq_printf(m
, ",local_lock=flock");
696 seq_printf(m
, ",local_lock=posix");
700 * Describe the mount options on this VFS mountpoint
702 int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
704 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
706 nfs_show_mount_options(m
, nfss
, 0);
709 seq_printf(m
, ",addr=%s",
710 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
716 EXPORT_SYMBOL_GPL(nfs_show_options
);
718 #if IS_ENABLED(CONFIG_NFS_V4)
719 #ifdef CONFIG_NFS_V4_1
720 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
722 if (nfs4_has_session(server
->nfs_client
))
723 seq_printf(m
, ",sessions");
726 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
730 #ifdef CONFIG_NFS_V4_1
731 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
733 seq_printf(m
, ",pnfs=");
734 if (server
->pnfs_curr_ld
)
735 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
737 seq_printf(m
, "not configured");
740 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
742 if (nfss
->nfs_client
&& nfss
->nfs_client
->cl_implid
) {
743 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->cl_implid
;
744 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
746 impl_id
->name
, impl_id
->domain
,
747 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
751 #if IS_ENABLED(CONFIG_NFS_V4)
752 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
756 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
761 int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
763 char *page
= (char *) __get_free_page(GFP_KERNEL
);
764 char *devname
, *dummy
;
768 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
);
770 err
= PTR_ERR(devname
);
772 seq_escape(m
, devname
, " \t\n\\");
773 free_page((unsigned long)page
);
776 EXPORT_SYMBOL_GPL(nfs_show_devname
);
778 int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
783 EXPORT_SYMBOL_GPL(nfs_show_path
);
786 * Present statistical information for this VFS mountpoint
788 int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
791 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
792 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
793 struct nfs_iostats totals
= { };
795 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
798 * Display all mount option settings
800 seq_printf(m
, "\n\topts:\t");
801 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
802 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
803 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
804 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
805 nfs_show_mount_options(m
, nfss
, 1);
807 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
809 show_implementation_id(m
, nfss
);
811 seq_printf(m
, "\n\tcaps:\t");
812 seq_printf(m
, "caps=0x%x", nfss
->caps
);
813 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
814 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
815 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
816 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
818 #if IS_ENABLED(CONFIG_NFS_V4)
819 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
820 seq_printf(m
, "\n\tnfsv4:\t");
821 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
822 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
823 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
824 show_sessions(m
, nfss
);
830 * Display security flavor in effect for this mount
832 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
834 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
837 * Display superblock I/O counters
839 for_each_possible_cpu(cpu
) {
840 struct nfs_iostats
*stats
;
843 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
845 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
846 totals
.events
[i
] += stats
->events
[i
];
847 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
848 totals
.bytes
[i
] += stats
->bytes
[i
];
849 #ifdef CONFIG_NFS_FSCACHE
850 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
851 totals
.fscache
[i
] += stats
->fscache
[i
];
857 seq_printf(m
, "\n\tevents:\t");
858 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
859 seq_printf(m
, "%lu ", totals
.events
[i
]);
860 seq_printf(m
, "\n\tbytes:\t");
861 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
862 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
863 #ifdef CONFIG_NFS_FSCACHE
864 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
865 seq_printf(m
, "\n\tfsc:\t");
866 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
867 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
872 rpc_print_iostats(m
, nfss
->client
);
876 EXPORT_SYMBOL_GPL(nfs_show_stats
);
879 * Begin unmount by attempting to remove all automounted mountpoints we added
880 * in response to xdev traversals and referrals
882 void nfs_umount_begin(struct super_block
*sb
)
884 struct nfs_server
*server
;
885 struct rpc_clnt
*rpc
;
888 /* -EIO all pending I/O */
889 rpc
= server
->client_acl
;
891 rpc_killall_tasks(rpc
);
892 rpc
= server
->client
;
894 rpc_killall_tasks(rpc
);
896 EXPORT_SYMBOL_GPL(nfs_umount_begin
);
898 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(void)
900 struct nfs_parsed_mount_data
*data
;
902 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
904 data
->acregmin
= NFS_DEF_ACREGMIN
;
905 data
->acregmax
= NFS_DEF_ACREGMAX
;
906 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
907 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
908 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
909 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
910 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
911 data
->auth_flavors
[0] = RPC_AUTH_UNIX
;
912 data
->auth_flavor_len
= 1;
913 data
->minorversion
= 0;
914 data
->need_mount
= true;
915 data
->net
= current
->nsproxy
->net_ns
;
916 security_init_mnt_opts(&data
->lsm_opts
);
921 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data
*data
)
924 kfree(data
->client_address
);
925 kfree(data
->mount_server
.hostname
);
926 kfree(data
->nfs_server
.export_path
);
927 kfree(data
->nfs_server
.hostname
);
928 kfree(data
->fscache_uniq
);
929 security_free_mnt_opts(&data
->lsm_opts
);
935 * Sanity-check a server address provided by the mount command.
937 * Address family must be initialized, and address must not be
938 * the ANY address for that family.
940 static int nfs_verify_server_address(struct sockaddr
*addr
)
942 switch (addr
->sa_family
) {
944 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
945 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
948 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
949 return !ipv6_addr_any(sa
);
953 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
958 * Select between a default port value and a user-specified port value.
959 * If a zero value is set, then autobind will be used.
961 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
962 const unsigned short default_port
)
964 if (*port
== NFS_UNSPEC_PORT
)
965 *port
= default_port
;
967 rpc_set_port(sap
, *port
);
971 * Sanity check the NFS transport protocol.
974 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
976 switch (mnt
->nfs_server
.protocol
) {
977 case XPRT_TRANSPORT_UDP
:
978 case XPRT_TRANSPORT_TCP
:
979 case XPRT_TRANSPORT_RDMA
:
982 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
987 * For text based NFSv2/v3 mounts, the mount protocol transport default
988 * settings should depend upon the specified NFS transport.
990 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
992 nfs_validate_transport_protocol(mnt
);
994 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
995 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
997 switch (mnt
->nfs_server
.protocol
) {
998 case XPRT_TRANSPORT_UDP
:
999 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1001 case XPRT_TRANSPORT_TCP
:
1002 case XPRT_TRANSPORT_RDMA
:
1003 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1008 * Parse the value of the 'sec=' option.
1010 static int nfs_parse_security_flavors(char *value
,
1011 struct nfs_parsed_mount_data
*mnt
)
1013 substring_t args
[MAX_OPT_ARGS
];
1015 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1017 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
1019 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
1022 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1025 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
1028 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
1031 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
1034 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
1037 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
1040 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1043 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1046 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1049 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1055 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1056 mnt
->auth_flavor_len
= 1;
1060 static int nfs_parse_version_string(char *string
,
1061 struct nfs_parsed_mount_data
*mnt
,
1064 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1065 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1070 mnt
->flags
|= NFS_MOUNT_VER3
;
1074 /* Backward compatibility option. In future,
1075 * the mount program should always supply
1076 * a NFSv4 minor version number.
1082 mnt
->minorversion
= 0;
1086 mnt
->minorversion
= 1;
1094 static int nfs_get_option_str(substring_t args
[], char **option
)
1097 *option
= match_strdup(args
);
1101 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1106 string
= match_strdup(args
);
1109 rc
= strict_strtoul(string
, 10, option
);
1116 * Error-check and convert a string of mount options from user space into
1117 * a data structure. The whole mount string is processed; bad options are
1118 * skipped as they are encountered. If there were no errors, return 1;
1119 * otherwise return 0 (zero).
1121 static int nfs_parse_mount_options(char *raw
,
1122 struct nfs_parsed_mount_data
*mnt
)
1124 char *p
, *string
, *secdata
;
1125 int rc
, sloppy
= 0, invalid_option
= 0;
1126 unsigned short protofamily
= AF_UNSPEC
;
1127 unsigned short mountfamily
= AF_UNSPEC
;
1130 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1133 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1135 secdata
= alloc_secdata();
1139 rc
= security_sb_copy_data(raw
, secdata
);
1141 goto out_security_failure
;
1143 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1145 goto out_security_failure
;
1147 free_secdata(secdata
);
1149 while ((p
= strsep(&raw
, ",")) != NULL
) {
1150 substring_t args
[MAX_OPT_ARGS
];
1151 unsigned long option
;
1157 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1159 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1163 * boolean options: foo/nofoo
1166 mnt
->flags
|= NFS_MOUNT_SOFT
;
1169 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1172 mnt
->flags
|= NFS_MOUNT_POSIX
;
1175 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1178 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1181 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1184 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1187 mnt
->flags
|= NFS_MOUNT_NOAC
;
1190 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1191 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1192 NFS_MOUNT_LOCAL_FCNTL
);
1195 mnt
->flags
|= NFS_MOUNT_NONLM
;
1196 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1197 NFS_MOUNT_LOCAL_FCNTL
);
1200 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1201 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1204 mnt
->flags
|= NFS_MOUNT_TCP
;
1205 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1208 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1209 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1210 xprt_load_transport(p
);
1213 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1216 mnt
->flags
|= NFS_MOUNT_NOACL
;
1219 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1221 case Opt_nordirplus
:
1222 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1224 case Opt_sharecache
:
1225 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1227 case Opt_nosharecache
:
1228 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1231 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1233 case Opt_noresvport
:
1234 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1237 mnt
->options
|= NFS_OPTION_FSCACHE
;
1238 kfree(mnt
->fscache_uniq
);
1239 mnt
->fscache_uniq
= NULL
;
1242 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1243 kfree(mnt
->fscache_uniq
);
1244 mnt
->fscache_uniq
= NULL
;
1248 * options that take numeric values
1251 if (nfs_get_option_ul(args
, &option
) ||
1253 goto out_invalid_value
;
1254 mnt
->nfs_server
.port
= option
;
1257 if (nfs_get_option_ul(args
, &option
))
1258 goto out_invalid_value
;
1259 mnt
->rsize
= option
;
1262 if (nfs_get_option_ul(args
, &option
))
1263 goto out_invalid_value
;
1264 mnt
->wsize
= option
;
1267 if (nfs_get_option_ul(args
, &option
))
1268 goto out_invalid_value
;
1269 mnt
->bsize
= option
;
1272 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1273 goto out_invalid_value
;
1274 mnt
->timeo
= option
;
1277 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1278 goto out_invalid_value
;
1279 mnt
->retrans
= option
;
1282 if (nfs_get_option_ul(args
, &option
))
1283 goto out_invalid_value
;
1284 mnt
->acregmin
= option
;
1287 if (nfs_get_option_ul(args
, &option
))
1288 goto out_invalid_value
;
1289 mnt
->acregmax
= option
;
1292 if (nfs_get_option_ul(args
, &option
))
1293 goto out_invalid_value
;
1294 mnt
->acdirmin
= option
;
1297 if (nfs_get_option_ul(args
, &option
))
1298 goto out_invalid_value
;
1299 mnt
->acdirmax
= option
;
1302 if (nfs_get_option_ul(args
, &option
))
1303 goto out_invalid_value
;
1304 mnt
->acregmin
= mnt
->acregmax
=
1305 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1308 if (nfs_get_option_ul(args
, &option
))
1309 goto out_invalid_value
;
1310 mnt
->namlen
= option
;
1313 if (nfs_get_option_ul(args
, &option
) ||
1315 goto out_invalid_value
;
1316 mnt
->mount_server
.port
= option
;
1319 if (nfs_get_option_ul(args
, &option
) ||
1320 option
< NFS_MNT_VERSION
||
1321 option
> NFS_MNT3_VERSION
)
1322 goto out_invalid_value
;
1323 mnt
->mount_server
.version
= option
;
1325 case Opt_minorversion
:
1326 if (nfs_get_option_ul(args
, &option
))
1327 goto out_invalid_value
;
1328 if (option
> NFS4_MAX_MINOR_VERSION
)
1329 goto out_invalid_value
;
1330 mnt
->minorversion
= option
;
1334 * options that take text values
1337 string
= match_strdup(args
);
1340 rc
= nfs_parse_version_string(string
, mnt
, args
);
1343 goto out_invalid_value
;
1346 string
= match_strdup(args
);
1349 rc
= nfs_parse_security_flavors(string
, mnt
);
1352 dfprintk(MOUNT
, "NFS: unrecognized "
1353 "security flavor\n");
1358 string
= match_strdup(args
);
1361 token
= match_token(string
,
1362 nfs_xprt_protocol_tokens
, args
);
1364 protofamily
= AF_INET
;
1367 protofamily
= AF_INET6
;
1369 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1370 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1373 protofamily
= AF_INET6
;
1375 mnt
->flags
|= NFS_MOUNT_TCP
;
1376 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1379 /* vector side protocols to TCP */
1380 mnt
->flags
|= NFS_MOUNT_TCP
;
1381 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1382 xprt_load_transport(string
);
1385 dfprintk(MOUNT
, "NFS: unrecognized "
1386 "transport protocol\n");
1392 case Opt_mountproto
:
1393 string
= match_strdup(args
);
1396 token
= match_token(string
,
1397 nfs_xprt_protocol_tokens
, args
);
1400 mountfamily
= AF_INET
;
1403 mountfamily
= AF_INET6
;
1405 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1408 mountfamily
= AF_INET6
;
1410 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1412 case Opt_xprt_rdma
: /* not used for side protocols */
1414 dfprintk(MOUNT
, "NFS: unrecognized "
1415 "transport protocol\n");
1420 string
= match_strdup(args
);
1423 mnt
->nfs_server
.addrlen
=
1424 rpc_pton(mnt
->net
, string
, strlen(string
),
1426 &mnt
->nfs_server
.address
,
1427 sizeof(mnt
->nfs_server
.address
));
1429 if (mnt
->nfs_server
.addrlen
== 0)
1430 goto out_invalid_address
;
1432 case Opt_clientaddr
:
1433 if (nfs_get_option_str(args
, &mnt
->client_address
))
1437 if (nfs_get_option_str(args
,
1438 &mnt
->mount_server
.hostname
))
1442 string
= match_strdup(args
);
1445 mnt
->mount_server
.addrlen
=
1446 rpc_pton(mnt
->net
, string
, strlen(string
),
1448 &mnt
->mount_server
.address
,
1449 sizeof(mnt
->mount_server
.address
));
1451 if (mnt
->mount_server
.addrlen
== 0)
1452 goto out_invalid_address
;
1454 case Opt_lookupcache
:
1455 string
= match_strdup(args
);
1458 token
= match_token(string
,
1459 nfs_lookupcache_tokens
, args
);
1462 case Opt_lookupcache_all
:
1463 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1465 case Opt_lookupcache_positive
:
1466 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1467 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1469 case Opt_lookupcache_none
:
1470 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1473 dfprintk(MOUNT
, "NFS: invalid "
1474 "lookupcache argument\n");
1478 case Opt_fscache_uniq
:
1479 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1481 mnt
->options
|= NFS_OPTION_FSCACHE
;
1483 case Opt_local_lock
:
1484 string
= match_strdup(args
);
1487 token
= match_token(string
, nfs_local_lock_tokens
,
1491 case Opt_local_lock_all
:
1492 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1493 NFS_MOUNT_LOCAL_FCNTL
);
1495 case Opt_local_lock_flock
:
1496 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1498 case Opt_local_lock_posix
:
1499 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1501 case Opt_local_lock_none
:
1502 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1503 NFS_MOUNT_LOCAL_FCNTL
);
1506 dfprintk(MOUNT
, "NFS: invalid "
1507 "local_lock argument\n");
1517 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1520 case Opt_deprecated
:
1521 dfprintk(MOUNT
, "NFS: ignoring mount option "
1527 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1532 if (!sloppy
&& invalid_option
)
1535 if (mnt
->minorversion
&& mnt
->version
!= 4)
1536 goto out_minorversion_mismatch
;
1539 * verify that any proto=/mountproto= options match the address
1540 * familiies in the addr=/mountaddr= options.
1542 if (protofamily
!= AF_UNSPEC
&&
1543 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1544 goto out_proto_mismatch
;
1546 if (mountfamily
!= AF_UNSPEC
) {
1547 if (mnt
->mount_server
.addrlen
) {
1548 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1549 goto out_mountproto_mismatch
;
1551 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1552 goto out_mountproto_mismatch
;
1558 out_mountproto_mismatch
:
1559 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1563 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1565 out_invalid_address
:
1566 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1569 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1571 out_minorversion_mismatch
:
1572 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1573 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1576 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1578 out_security_failure
:
1579 free_secdata(secdata
);
1580 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1585 * Match the requested auth flavors with the list returned by
1586 * the server. Returns zero and sets the mount's authentication
1587 * flavor on success; returns -EACCES if server does not support
1588 * the requested flavor.
1590 static int nfs_walk_authlist(struct nfs_parsed_mount_data
*args
,
1591 struct nfs_mount_request
*request
)
1593 unsigned int i
, j
, server_authlist_len
= *(request
->auth_flav_len
);
1596 * Certain releases of Linux's mountd return an empty
1597 * flavor list. To prevent behavioral regression with
1598 * these servers (ie. rejecting mounts that used to
1599 * succeed), revert to pre-2.6.32 behavior (no checking)
1600 * if the returned flavor list is empty.
1602 if (server_authlist_len
== 0)
1606 * We avoid sophisticated negotiating here, as there are
1607 * plenty of cases where we can get it wrong, providing
1608 * either too little or too much security.
1610 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1611 * flavor listed first. However, some servers list
1612 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1613 * preferred default, in args->auth_flavors[0] if user
1614 * didn't specify sec= mount option.
1616 for (i
= 0; i
< args
->auth_flavor_len
; i
++)
1617 for (j
= 0; j
< server_authlist_len
; j
++)
1618 if (args
->auth_flavors
[i
] == request
->auth_flavs
[j
]) {
1619 dfprintk(MOUNT
, "NFS: using auth flavor %d\n",
1620 request
->auth_flavs
[j
]);
1621 args
->auth_flavors
[0] = request
->auth_flavs
[j
];
1625 dfprintk(MOUNT
, "NFS: server does not support requested auth flavor\n");
1626 nfs_umount(request
);
1631 * Use the remote server's MOUNT service to request the NFS file handle
1632 * corresponding to the provided path.
1634 static int nfs_request_mount(struct nfs_parsed_mount_data
*args
,
1635 struct nfs_fh
*root_fh
)
1637 rpc_authflavor_t server_authlist
[NFS_MAX_SECFLAVORS
];
1638 unsigned int server_authlist_len
= ARRAY_SIZE(server_authlist
);
1639 struct nfs_mount_request request
= {
1640 .sap
= (struct sockaddr
*)
1641 &args
->mount_server
.address
,
1642 .dirpath
= args
->nfs_server
.export_path
,
1643 .protocol
= args
->mount_server
.protocol
,
1645 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1646 .auth_flav_len
= &server_authlist_len
,
1647 .auth_flavs
= server_authlist
,
1652 if (args
->mount_server
.version
== 0) {
1653 switch (args
->version
) {
1655 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1658 args
->mount_server
.version
= NFS_MNT_VERSION
;
1661 request
.version
= args
->mount_server
.version
;
1663 if (args
->mount_server
.hostname
)
1664 request
.hostname
= args
->mount_server
.hostname
;
1666 request
.hostname
= args
->nfs_server
.hostname
;
1669 * Construct the mount server's address.
1671 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1672 memcpy(request
.sap
, &args
->nfs_server
.address
,
1673 args
->nfs_server
.addrlen
);
1674 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1676 request
.salen
= args
->mount_server
.addrlen
;
1677 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1680 * Now ask the mount server to map our export path
1683 status
= nfs_mount(&request
);
1685 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1686 request
.hostname
, status
);
1691 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1693 if (args
->mount_server
.version
!= NFS_MNT3_VERSION
)
1695 return nfs_walk_authlist(args
, &request
);
1698 struct dentry
*nfs_try_mount(int flags
, const char *dev_name
,
1699 struct nfs_mount_info
*mount_info
,
1700 struct nfs_subversion
*nfs_mod
)
1703 struct nfs_server
*server
;
1705 if (mount_info
->parsed
->need_mount
) {
1706 status
= nfs_request_mount(mount_info
->parsed
, mount_info
->mntfh
);
1708 return ERR_PTR(status
);
1711 /* Get a volume representation */
1712 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1714 return ERR_CAST(server
);
1716 return nfs_fs_mount_common(server
, flags
, dev_name
, mount_info
, nfs_mod
);
1718 EXPORT_SYMBOL_GPL(nfs_try_mount
);
1721 * Split "dev_name" into "hostname:export_path".
1723 * The leftmost colon demarks the split between the server's hostname
1724 * and the export path. If the hostname starts with a left square
1725 * bracket, then it may contain colons.
1727 * Note: caller frees hostname and export path, even on error.
1729 static int nfs_parse_devname(const char *dev_name
,
1730 char **hostname
, size_t maxnamlen
,
1731 char **export_path
, size_t maxpathlen
)
1736 /* Is the host name protected with square brakcets? */
1737 if (*dev_name
== '[') {
1738 end
= strchr(++dev_name
, ']');
1739 if (end
== NULL
|| end
[1] != ':')
1740 goto out_bad_devname
;
1742 len
= end
- dev_name
;
1747 end
= strchr(dev_name
, ':');
1749 goto out_bad_devname
;
1750 len
= end
- dev_name
;
1752 /* kill possible hostname list: not supported */
1753 comma
= strchr(dev_name
, ',');
1754 if (comma
!= NULL
&& comma
< end
)
1758 if (len
> maxnamlen
)
1761 /* N.B. caller will free nfs_server.hostname in all cases */
1762 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1763 if (*hostname
== NULL
)
1765 len
= strlen(++end
);
1766 if (len
> maxpathlen
)
1768 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1772 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1776 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1780 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1784 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1785 return -ENAMETOOLONG
;
1788 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1789 return -ENAMETOOLONG
;
1793 * Validate the NFS2/NFS3 mount data
1794 * - fills in the mount root filehandle
1796 * For option strings, user space handles the following behaviors:
1798 * + DNS: mapping server host name to IP address ("addr=" option)
1800 * + failure mode: how to behave if a mount request can't be handled
1801 * immediately ("fg/bg" option)
1803 * + retry: how often to retry a mount request ("retry=" option)
1805 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1806 * mountproto=tcp after mountproto=udp, and so on
1808 static int nfs23_validate_mount_data(void *options
,
1809 struct nfs_parsed_mount_data
*args
,
1810 struct nfs_fh
*mntfh
,
1811 const char *dev_name
)
1813 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1814 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1819 args
->version
= NFS_DEFAULT_VERSION
;
1820 switch (data
->version
) {
1826 if (data
->flags
& NFS_MOUNT_VER3
)
1828 data
->root
.size
= NFS2_FHSIZE
;
1829 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1831 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1834 memset(data
->context
, 0, sizeof(data
->context
));
1836 if (data
->flags
& NFS_MOUNT_VER3
) {
1837 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1838 goto out_invalid_fh
;
1839 mntfh
->size
= data
->root
.size
;
1842 mntfh
->size
= NFS2_FHSIZE
;
1847 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1848 if (mntfh
->size
< sizeof(mntfh
->data
))
1849 memset(mntfh
->data
+ mntfh
->size
, 0,
1850 sizeof(mntfh
->data
) - mntfh
->size
);
1853 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1856 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1857 args
->flags
|= NFS_MOUNT_LEGACY_INTERFACE
;
1858 args
->rsize
= data
->rsize
;
1859 args
->wsize
= data
->wsize
;
1860 args
->timeo
= data
->timeo
;
1861 args
->retrans
= data
->retrans
;
1862 args
->acregmin
= data
->acregmin
;
1863 args
->acregmax
= data
->acregmax
;
1864 args
->acdirmin
= data
->acdirmin
;
1865 args
->acdirmax
= data
->acdirmax
;
1866 args
->need_mount
= false;
1868 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1869 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1870 if (!nfs_verify_server_address(sap
))
1871 goto out_no_address
;
1873 if (!(data
->flags
& NFS_MOUNT_TCP
))
1874 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1875 /* N.B. caller will free nfs_server.hostname in all cases */
1876 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1877 args
->namlen
= data
->namlen
;
1878 args
->bsize
= data
->bsize
;
1880 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1881 args
->auth_flavors
[0] = data
->pseudoflavor
;
1882 if (!args
->nfs_server
.hostname
)
1885 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1886 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1887 NFS_MOUNT_LOCAL_FCNTL
);
1889 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1890 NFS_MOUNT_LOCAL_FCNTL
);
1892 * The legacy version 6 binary mount data from userspace has a
1893 * field used only to transport selinux information into the
1894 * the kernel. To continue to support that functionality we
1895 * have a touch of selinux knowledge here in the NFS code. The
1896 * userspace code converted context=blah to just blah so we are
1897 * converting back to the full string selinux understands.
1899 if (data
->context
[0]){
1900 #ifdef CONFIG_SECURITY_SELINUX
1902 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1905 strcpy(opts_str
, "context=");
1906 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1907 strcat(opts_str
, &data
->context
[0]);
1908 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1919 return NFS_TEXT_DATA
;
1922 #if !IS_ENABLED(CONFIG_NFS_V3)
1923 if (args
->version
== 3)
1924 goto out_v3_not_compiled
;
1925 #endif /* !CONFIG_NFS_V3 */
1930 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1934 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1939 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1942 #if !IS_ENABLED(CONFIG_NFS_V3)
1943 out_v3_not_compiled
:
1944 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1945 return -EPROTONOSUPPORT
;
1946 #endif /* !CONFIG_NFS_V3 */
1949 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1953 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1957 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1961 #if IS_ENABLED(CONFIG_NFS_V4)
1962 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1964 struct nfs_parsed_mount_data
*args
,
1965 struct nfs_fh
*mntfh
,
1966 const char *dev_name
)
1968 if (fs_type
== &nfs_fs_type
)
1969 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
1970 return nfs4_validate_mount_data(options
, args
, dev_name
);
1973 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1975 struct nfs_parsed_mount_data
*args
,
1976 struct nfs_fh
*mntfh
,
1977 const char *dev_name
)
1979 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
1983 static int nfs_validate_text_mount_data(void *options
,
1984 struct nfs_parsed_mount_data
*args
,
1985 const char *dev_name
)
1988 int max_namelen
= PAGE_SIZE
;
1989 int max_pathlen
= NFS_MAXPATHLEN
;
1990 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1992 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1995 if (!nfs_verify_server_address(sap
))
1996 goto out_no_address
;
1998 if (args
->version
== 4) {
1999 #if IS_ENABLED(CONFIG_NFS_V4)
2001 max_namelen
= NFS4_MAXNAMLEN
;
2002 max_pathlen
= NFS4_MAXPATHLEN
;
2003 nfs_validate_transport_protocol(args
);
2004 nfs4_validate_mount_flags(args
);
2006 goto out_v4_not_compiled
;
2007 #endif /* CONFIG_NFS_V4 */
2009 nfs_set_mount_transport_protocol(args
);
2011 nfs_set_port(sap
, &args
->nfs_server
.port
, port
);
2013 if (args
->auth_flavor_len
> 1)
2016 return nfs_parse_devname(dev_name
,
2017 &args
->nfs_server
.hostname
,
2019 &args
->nfs_server
.export_path
,
2022 #if !IS_ENABLED(CONFIG_NFS_V4)
2023 out_v4_not_compiled
:
2024 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2025 return -EPROTONOSUPPORT
;
2026 #endif /* !CONFIG_NFS_V4 */
2029 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2033 dfprintk(MOUNT
, "NFS: Too many RPC auth flavours specified\n");
2038 nfs_compare_remount_data(struct nfs_server
*nfss
,
2039 struct nfs_parsed_mount_data
*data
)
2041 if (data
->flags
!= nfss
->flags
||
2042 data
->rsize
!= nfss
->rsize
||
2043 data
->wsize
!= nfss
->wsize
||
2044 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
2045 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
2046 data
->acregmin
!= nfss
->acregmin
/ HZ
||
2047 data
->acregmax
!= nfss
->acregmax
/ HZ
||
2048 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
2049 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
2050 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
2051 data
->nfs_server
.port
!= nfss
->port
||
2052 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
2053 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
2054 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
2061 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
2064 struct nfs_server
*nfss
= sb
->s_fs_info
;
2065 struct nfs_parsed_mount_data
*data
;
2066 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
2067 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
2068 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
2071 * Userspace mount programs that send binary options generally send
2072 * them populated with default values. We have no way to know which
2073 * ones were explicitly specified. Fall back to legacy behavior and
2074 * just return success.
2076 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2077 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2078 options
->version
<= 6))))
2081 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2085 /* fill out struct with values from existing mount */
2086 data
->flags
= nfss
->flags
;
2087 data
->rsize
= nfss
->rsize
;
2088 data
->wsize
= nfss
->wsize
;
2089 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2090 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
2091 data
->acregmin
= nfss
->acregmin
/ HZ
;
2092 data
->acregmax
= nfss
->acregmax
/ HZ
;
2093 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2094 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2095 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2096 data
->nfs_server
.port
= nfss
->port
;
2097 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2098 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2099 data
->nfs_server
.addrlen
);
2101 /* overwrite those values with any that were specified */
2102 error
= nfs_parse_mount_options((char *)options
, data
);
2107 * noac is a special case. It implies -o sync, but that's not
2108 * necessarily reflected in the mtab options. do_remount_sb
2109 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2110 * remount options, so we have to explicitly reset it.
2112 if (data
->flags
& NFS_MOUNT_NOAC
)
2113 *flags
|= MS_SYNCHRONOUS
;
2115 /* compare new mount options with old ones */
2116 error
= nfs_compare_remount_data(nfss
, data
);
2121 EXPORT_SYMBOL_GPL(nfs_remount
);
2124 * Initialise the common bits of the superblock
2126 inline void nfs_initialise_sb(struct super_block
*sb
)
2128 struct nfs_server
*server
= NFS_SB(sb
);
2130 sb
->s_magic
= NFS_SUPER_MAGIC
;
2132 /* We probably want something more informative here */
2133 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2134 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2136 if (sb
->s_blocksize
== 0)
2137 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2138 &sb
->s_blocksize_bits
);
2140 sb
->s_bdi
= &server
->backing_dev_info
;
2142 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2146 * Finish setting up an NFS2/3 superblock
2148 void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2150 struct nfs_parsed_mount_data
*data
= mount_info
->parsed
;
2151 struct nfs_server
*server
= NFS_SB(sb
);
2153 sb
->s_blocksize_bits
= 0;
2154 sb
->s_blocksize
= 0;
2155 sb
->s_xattr
= server
->nfs_client
->cl_nfs_mod
->xattr
;
2156 sb
->s_op
= server
->nfs_client
->cl_nfs_mod
->sops
;
2157 if (data
&& data
->bsize
)
2158 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2160 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2161 /* The VFS shouldn't apply the umask to mode bits. We will do
2162 * so ourselves when necessary.
2164 sb
->s_flags
|= MS_POSIXACL
;
2165 sb
->s_time_gran
= 1;
2168 nfs_initialise_sb(sb
);
2170 EXPORT_SYMBOL_GPL(nfs_fill_super
);
2173 * Finish setting up a cloned NFS2/3/4 superblock
2175 void nfs_clone_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2177 const struct super_block
*old_sb
= mount_info
->cloned
->sb
;
2178 struct nfs_server
*server
= NFS_SB(sb
);
2180 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2181 sb
->s_blocksize
= old_sb
->s_blocksize
;
2182 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2183 sb
->s_xattr
= old_sb
->s_xattr
;
2184 sb
->s_op
= old_sb
->s_op
;
2185 sb
->s_time_gran
= 1;
2187 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2188 /* The VFS shouldn't apply the umask to mode bits. We will do
2189 * so ourselves when necessary.
2191 sb
->s_flags
|= MS_POSIXACL
;
2194 nfs_initialise_sb(sb
);
2197 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2199 const struct nfs_server
*a
= s
->s_fs_info
;
2200 const struct rpc_clnt
*clnt_a
= a
->client
;
2201 const struct rpc_clnt
*clnt_b
= b
->client
;
2203 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2205 if (a
->nfs_client
!= b
->nfs_client
)
2207 if (a
->flags
!= b
->flags
)
2209 if (a
->wsize
!= b
->wsize
)
2211 if (a
->rsize
!= b
->rsize
)
2213 if (a
->acregmin
!= b
->acregmin
)
2215 if (a
->acregmax
!= b
->acregmax
)
2217 if (a
->acdirmin
!= b
->acdirmin
)
2219 if (a
->acdirmax
!= b
->acdirmax
)
2221 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2228 struct nfs_sb_mountdata
{
2229 struct nfs_server
*server
;
2233 static int nfs_set_super(struct super_block
*s
, void *data
)
2235 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2236 struct nfs_server
*server
= sb_mntdata
->server
;
2239 s
->s_flags
= sb_mntdata
->mntflags
;
2240 s
->s_fs_info
= server
;
2241 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2242 ret
= set_anon_super(s
, server
);
2244 server
->s_dev
= s
->s_dev
;
2248 static int nfs_compare_super_address(struct nfs_server
*server1
,
2249 struct nfs_server
*server2
)
2251 struct sockaddr
*sap1
, *sap2
;
2253 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2254 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2256 if (sap1
->sa_family
!= sap2
->sa_family
)
2259 switch (sap1
->sa_family
) {
2261 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2262 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2263 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2265 if (sin1
->sin_port
!= sin2
->sin_port
)
2270 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2271 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2272 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2274 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2285 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2287 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2288 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2289 int mntflags
= sb_mntdata
->mntflags
;
2291 if (!nfs_compare_super_address(old
, server
))
2293 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2294 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2296 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2298 return nfs_compare_mount_options(sb
, server
, mntflags
);
2301 #ifdef CONFIG_NFS_FSCACHE
2302 static void nfs_get_cache_cookie(struct super_block
*sb
,
2303 struct nfs_parsed_mount_data
*parsed
,
2304 struct nfs_clone_mount
*cloned
)
2309 if (parsed
&& parsed
->fscache_uniq
) {
2310 uniq
= parsed
->fscache_uniq
;
2311 ulen
= strlen(parsed
->fscache_uniq
);
2312 } else if (cloned
) {
2313 struct nfs_server
*mnt_s
= NFS_SB(cloned
->sb
);
2314 if (mnt_s
->fscache_key
) {
2315 uniq
= mnt_s
->fscache_key
->key
.uniquifier
;
2316 ulen
= mnt_s
->fscache_key
->key
.uniq_len
;
2320 nfs_fscache_get_super_cookie(sb
, uniq
, ulen
);
2323 static void nfs_get_cache_cookie(struct super_block
*sb
,
2324 struct nfs_parsed_mount_data
*parsed
,
2325 struct nfs_clone_mount
*cloned
)
2330 static int nfs_bdi_register(struct nfs_server
*server
)
2332 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2335 int nfs_set_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2336 struct nfs_mount_info
*mount_info
)
2338 return security_sb_set_mnt_opts(s
, &mount_info
->parsed
->lsm_opts
);
2340 EXPORT_SYMBOL_GPL(nfs_set_sb_security
);
2342 int nfs_clone_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2343 struct nfs_mount_info
*mount_info
)
2345 /* clone any lsm security options from the parent to the new sb */
2346 security_sb_clone_mnt_opts(mount_info
->cloned
->sb
, s
);
2347 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
)
2351 EXPORT_SYMBOL_GPL(nfs_clone_sb_security
);
2353 struct dentry
*nfs_fs_mount_common(struct nfs_server
*server
,
2354 int flags
, const char *dev_name
,
2355 struct nfs_mount_info
*mount_info
,
2356 struct nfs_subversion
*nfs_mod
)
2358 struct super_block
*s
;
2359 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2360 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2361 struct nfs_sb_mountdata sb_mntdata
= {
2367 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2368 compare_super
= NULL
;
2370 /* -o noac implies -o sync */
2371 if (server
->flags
& NFS_MOUNT_NOAC
)
2372 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2374 /* Get a superblock - note that we may end up sharing one that already exists */
2375 s
= sget(nfs_mod
->nfs_fs
, compare_super
, nfs_set_super
, flags
, &sb_mntdata
);
2377 mntroot
= ERR_CAST(s
);
2381 if (s
->s_fs_info
!= server
) {
2382 nfs_free_server(server
);
2385 error
= nfs_bdi_register(server
);
2387 mntroot
= ERR_PTR(error
);
2388 goto error_splat_bdi
;
2393 /* initial superblock/root creation */
2394 mount_info
->fill_super(s
, mount_info
);
2395 nfs_get_cache_cookie(s
, mount_info
->parsed
, mount_info
->cloned
);
2398 mntroot
= nfs_get_root(s
, mount_info
->mntfh
, dev_name
);
2399 if (IS_ERR(mntroot
))
2400 goto error_splat_super
;
2402 error
= mount_info
->set_security(s
, mntroot
, mount_info
);
2404 goto error_splat_root
;
2406 s
->s_flags
|= MS_ACTIVE
;
2412 nfs_free_server(server
);
2417 mntroot
= ERR_PTR(error
);
2419 if (server
&& !s
->s_root
)
2420 bdi_unregister(&server
->backing_dev_info
);
2422 deactivate_locked_super(s
);
2425 EXPORT_SYMBOL_GPL(nfs_fs_mount_common
);
2427 struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2428 int flags
, const char *dev_name
, void *raw_data
)
2430 struct nfs_mount_info mount_info
= {
2431 .fill_super
= nfs_fill_super
,
2432 .set_security
= nfs_set_sb_security
,
2434 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2435 struct nfs_subversion
*nfs_mod
;
2438 mount_info
.parsed
= nfs_alloc_parsed_mount_data();
2439 mount_info
.mntfh
= nfs_alloc_fhandle();
2440 if (mount_info
.parsed
== NULL
|| mount_info
.mntfh
== NULL
)
2443 /* Validate the mount data */
2444 error
= nfs_validate_mount_data(fs_type
, raw_data
, mount_info
.parsed
, mount_info
.mntfh
, dev_name
);
2445 if (error
== NFS_TEXT_DATA
)
2446 error
= nfs_validate_text_mount_data(raw_data
, mount_info
.parsed
, dev_name
);
2448 mntroot
= ERR_PTR(error
);
2452 nfs_mod
= get_nfs_version(mount_info
.parsed
->version
);
2453 if (IS_ERR(nfs_mod
)) {
2454 mntroot
= ERR_CAST(nfs_mod
);
2458 mntroot
= nfs_mod
->rpc_ops
->try_mount(flags
, dev_name
, &mount_info
, nfs_mod
);
2460 put_nfs_version(nfs_mod
);
2462 nfs_free_parsed_mount_data(mount_info
.parsed
);
2463 nfs_free_fhandle(mount_info
.mntfh
);
2466 EXPORT_SYMBOL_GPL(nfs_fs_mount
);
2469 * Ensure that we unregister the bdi before kill_anon_super
2470 * releases the device name
2472 void nfs_put_super(struct super_block
*s
)
2474 struct nfs_server
*server
= NFS_SB(s
);
2476 bdi_unregister(&server
->backing_dev_info
);
2478 EXPORT_SYMBOL_GPL(nfs_put_super
);
2481 * Destroy an NFS2/3 superblock
2483 void nfs_kill_super(struct super_block
*s
)
2485 struct nfs_server
*server
= NFS_SB(s
);
2488 nfs_fscache_release_super_cookie(s
);
2489 nfs_free_server(server
);
2491 EXPORT_SYMBOL_GPL(nfs_kill_super
);
2494 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2497 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2498 const char *dev_name
, void *raw_data
)
2500 struct nfs_clone_mount
*data
= raw_data
;
2501 struct nfs_mount_info mount_info
= {
2502 .fill_super
= nfs_clone_super
,
2503 .set_security
= nfs_clone_sb_security
,
2506 struct nfs_server
*server
;
2507 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2508 struct nfs_subversion
*nfs_mod
= NFS_SB(data
->sb
)->nfs_client
->cl_nfs_mod
;
2511 dprintk("--> nfs_xdev_mount_common()\n");
2513 mount_info
.mntfh
= mount_info
.cloned
->fh
;
2515 /* create a new volume representation */
2516 server
= nfs_mod
->rpc_ops
->clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2517 if (IS_ERR(server
)) {
2518 error
= PTR_ERR(server
);
2522 mntroot
= nfs_fs_mount_common(server
, flags
, dev_name
, &mount_info
, nfs_mod
);
2523 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2528 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error
);
2532 #if IS_ENABLED(CONFIG_NFS_V4)
2534 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2536 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2537 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2541 * Validate NFSv4 mount options
2543 static int nfs4_validate_mount_data(void *options
,
2544 struct nfs_parsed_mount_data
*args
,
2545 const char *dev_name
)
2547 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2548 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2556 switch (data
->version
) {
2558 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2559 goto out_no_address
;
2560 if (data
->host_addrlen
== 0)
2561 goto out_no_address
;
2562 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2563 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2565 if (!nfs_verify_server_address(sap
))
2566 goto out_no_address
;
2568 if (data
->auth_flavourlen
) {
2569 if (data
->auth_flavourlen
> 1)
2570 goto out_inval_auth
;
2571 if (copy_from_user(&args
->auth_flavors
[0],
2572 data
->auth_flavours
,
2573 sizeof(args
->auth_flavors
[0])))
2577 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2580 args
->nfs_server
.hostname
= c
;
2582 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2585 args
->nfs_server
.export_path
= c
;
2586 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2588 c
= strndup_user(data
->client_addr
.data
, 16);
2591 args
->client_address
= c
;
2594 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2598 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2599 args
->rsize
= data
->rsize
;
2600 args
->wsize
= data
->wsize
;
2601 args
->timeo
= data
->timeo
;
2602 args
->retrans
= data
->retrans
;
2603 args
->acregmin
= data
->acregmin
;
2604 args
->acregmax
= data
->acregmax
;
2605 args
->acdirmin
= data
->acdirmin
;
2606 args
->acdirmax
= data
->acdirmax
;
2607 args
->nfs_server
.protocol
= data
->proto
;
2608 nfs_validate_transport_protocol(args
);
2612 return NFS_TEXT_DATA
;
2618 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2622 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2623 data
->auth_flavourlen
);
2627 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2632 * NFS v4 module parameters need to stay in the
2633 * NFS client for backwards compatibility
2635 unsigned int nfs_callback_set_tcpport
;
2636 unsigned short nfs_callback_tcpport
;
2637 /* Default cache timeout is 10 minutes */
2638 unsigned int nfs_idmap_cache_timeout
= 600;
2639 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2640 bool nfs4_disable_idmapping
= true;
2641 unsigned short max_session_slots
= NFS4_DEF_SLOT_TABLE_SIZE
;
2642 unsigned short send_implementation_id
= 1;
2644 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport
);
2645 EXPORT_SYMBOL_GPL(nfs_callback_tcpport
);
2646 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout
);
2647 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping
);
2648 EXPORT_SYMBOL_GPL(max_session_slots
);
2649 EXPORT_SYMBOL_GPL(send_implementation_id
);
2651 #define NFS_CALLBACK_MAXPORTNR (65535U)
2653 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2660 ret
= strict_strtoul(val
, 0, &num
);
2661 if (ret
== -EINVAL
|| num
> NFS_CALLBACK_MAXPORTNR
)
2663 *((unsigned int *)kp
->arg
) = num
;
2666 static struct kernel_param_ops param_ops_portnr
= {
2667 .set
= param_set_portnr
,
2668 .get
= param_get_uint
,
2670 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2672 module_param_named(callback_tcpport
, nfs_callback_set_tcpport
, portnr
, 0644);
2673 module_param(nfs_idmap_cache_timeout
, int, 0644);
2674 module_param(nfs4_disable_idmapping
, bool, 0644);
2675 MODULE_PARM_DESC(nfs4_disable_idmapping
,
2676 "Turn off NFSv4 idmapping when using 'sec=sys'");
2677 module_param(max_session_slots
, ushort
, 0644);
2678 MODULE_PARM_DESC(max_session_slots
, "Maximum number of outstanding NFSv4.1 "
2679 "requests the client will negotiate");
2680 module_param(send_implementation_id
, ushort
, 0644);
2681 MODULE_PARM_DESC(send_implementation_id
,
2682 "Send implementation ID with NFSv4.1 exchange_id");
2683 MODULE_ALIAS("nfs4");
2685 #endif /* CONFIG_NFS_V4 */