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"
66 #include "nfs4session.h"
70 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_TEXT_DATA 1
73 #if IS_ENABLED(CONFIG_NFS_V3)
74 #define NFS_DEFAULT_VERSION 3
76 #define NFS_DEFAULT_VERSION 2
80 /* Mount options that take no arguments */
82 Opt_posix
, Opt_noposix
,
86 Opt_udp
, Opt_tcp
, Opt_rdma
,
88 Opt_rdirplus
, Opt_nordirplus
,
89 Opt_sharecache
, Opt_nosharecache
,
90 Opt_resvport
, Opt_noresvport
,
91 Opt_fscache
, Opt_nofscache
,
92 Opt_migration
, Opt_nomigration
,
94 /* Mount options that take integer arguments */
96 Opt_rsize
, Opt_wsize
, Opt_bsize
,
97 Opt_timeo
, Opt_retrans
,
98 Opt_acregmin
, Opt_acregmax
,
99 Opt_acdirmin
, Opt_acdirmax
,
106 /* Mount options that take string arguments */
108 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
109 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
114 /* Special mount options */
115 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
120 static const match_table_t nfs_mount_option_tokens
= {
121 { Opt_userspace
, "bg" },
122 { Opt_userspace
, "fg" },
123 { Opt_userspace
, "retry=%s" },
125 { Opt_sloppy
, "sloppy" },
127 { Opt_soft
, "soft" },
128 { Opt_hard
, "hard" },
129 { Opt_deprecated
, "intr" },
130 { Opt_deprecated
, "nointr" },
131 { Opt_posix
, "posix" },
132 { Opt_noposix
, "noposix" },
134 { Opt_nocto
, "nocto" },
136 { Opt_noac
, "noac" },
137 { Opt_lock
, "lock" },
138 { Opt_nolock
, "nolock" },
141 { Opt_rdma
, "rdma" },
143 { Opt_noacl
, "noacl" },
144 { Opt_rdirplus
, "rdirplus" },
145 { Opt_nordirplus
, "nordirplus" },
146 { Opt_sharecache
, "sharecache" },
147 { Opt_nosharecache
, "nosharecache" },
148 { Opt_resvport
, "resvport" },
149 { Opt_noresvport
, "noresvport" },
150 { Opt_fscache
, "fsc" },
151 { Opt_nofscache
, "nofsc" },
152 { Opt_migration
, "migration" },
153 { Opt_nomigration
, "nomigration" },
155 { Opt_port
, "port=%s" },
156 { Opt_rsize
, "rsize=%s" },
157 { Opt_wsize
, "wsize=%s" },
158 { Opt_bsize
, "bsize=%s" },
159 { Opt_timeo
, "timeo=%s" },
160 { Opt_retrans
, "retrans=%s" },
161 { Opt_acregmin
, "acregmin=%s" },
162 { Opt_acregmax
, "acregmax=%s" },
163 { Opt_acdirmin
, "acdirmin=%s" },
164 { Opt_acdirmax
, "acdirmax=%s" },
165 { Opt_actimeo
, "actimeo=%s" },
166 { Opt_namelen
, "namlen=%s" },
167 { Opt_mountport
, "mountport=%s" },
168 { Opt_mountvers
, "mountvers=%s" },
169 { Opt_minorversion
, "minorversion=%s" },
171 { Opt_nfsvers
, "nfsvers=%s" },
172 { Opt_nfsvers
, "vers=%s" },
174 { Opt_sec
, "sec=%s" },
175 { Opt_proto
, "proto=%s" },
176 { Opt_mountproto
, "mountproto=%s" },
177 { Opt_addr
, "addr=%s" },
178 { Opt_clientaddr
, "clientaddr=%s" },
179 { Opt_mounthost
, "mounthost=%s" },
180 { Opt_mountaddr
, "mountaddr=%s" },
182 { Opt_lookupcache
, "lookupcache=%s" },
183 { Opt_fscache_uniq
, "fsc=%s" },
184 { Opt_local_lock
, "local_lock=%s" },
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers
, "v%s" },
193 Opt_xprt_udp
, Opt_xprt_udp6
, Opt_xprt_tcp
, Opt_xprt_tcp6
, Opt_xprt_rdma
,
198 static const match_table_t nfs_xprt_protocol_tokens
= {
199 { Opt_xprt_udp
, "udp" },
200 { Opt_xprt_udp6
, "udp6" },
201 { Opt_xprt_tcp
, "tcp" },
202 { Opt_xprt_tcp6
, "tcp6" },
203 { Opt_xprt_rdma
, "rdma" },
205 { Opt_xprt_err
, NULL
}
209 Opt_sec_none
, Opt_sec_sys
,
210 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
211 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
212 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
217 static const match_table_t nfs_secflavor_tokens
= {
218 { Opt_sec_none
, "none" },
219 { Opt_sec_none
, "null" },
220 { Opt_sec_sys
, "sys" },
222 { Opt_sec_krb5
, "krb5" },
223 { Opt_sec_krb5i
, "krb5i" },
224 { Opt_sec_krb5p
, "krb5p" },
226 { Opt_sec_lkey
, "lkey" },
227 { Opt_sec_lkeyi
, "lkeyi" },
228 { Opt_sec_lkeyp
, "lkeyp" },
230 { Opt_sec_spkm
, "spkm3" },
231 { Opt_sec_spkmi
, "spkm3i" },
232 { Opt_sec_spkmp
, "spkm3p" },
234 { Opt_sec_err
, NULL
}
238 Opt_lookupcache_all
, Opt_lookupcache_positive
,
239 Opt_lookupcache_none
,
244 static match_table_t nfs_lookupcache_tokens
= {
245 { Opt_lookupcache_all
, "all" },
246 { Opt_lookupcache_positive
, "pos" },
247 { Opt_lookupcache_positive
, "positive" },
248 { Opt_lookupcache_none
, "none" },
250 { Opt_lookupcache_err
, NULL
}
254 Opt_local_lock_all
, Opt_local_lock_flock
, Opt_local_lock_posix
,
260 static match_table_t nfs_local_lock_tokens
= {
261 { Opt_local_lock_all
, "all" },
262 { Opt_local_lock_flock
, "flock" },
263 { Opt_local_lock_posix
, "posix" },
264 { Opt_local_lock_none
, "none" },
266 { Opt_local_lock_err
, NULL
}
270 Opt_vers_2
, Opt_vers_3
, Opt_vers_4
, Opt_vers_4_0
,
276 static match_table_t nfs_vers_tokens
= {
280 { Opt_vers_4_0
, "4.0" },
281 { Opt_vers_4_1
, "4.1" },
283 { Opt_vers_err
, NULL
}
286 static struct dentry
*nfs_xdev_mount(struct file_system_type
*fs_type
,
287 int flags
, const char *dev_name
, void *raw_data
);
289 struct file_system_type nfs_fs_type
= {
290 .owner
= THIS_MODULE
,
292 .mount
= nfs_fs_mount
,
293 .kill_sb
= nfs_kill_super
,
294 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
296 EXPORT_SYMBOL_GPL(nfs_fs_type
);
298 struct file_system_type nfs_xdev_fs_type
= {
299 .owner
= THIS_MODULE
,
301 .mount
= nfs_xdev_mount
,
302 .kill_sb
= nfs_kill_super
,
303 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
306 const struct super_operations nfs_sops
= {
307 .alloc_inode
= nfs_alloc_inode
,
308 .destroy_inode
= nfs_destroy_inode
,
309 .write_inode
= nfs_write_inode
,
310 .drop_inode
= nfs_drop_inode
,
311 .put_super
= nfs_put_super
,
312 .statfs
= nfs_statfs
,
313 .evict_inode
= nfs_evict_inode
,
314 .umount_begin
= nfs_umount_begin
,
315 .show_options
= nfs_show_options
,
316 .show_devname
= nfs_show_devname
,
317 .show_path
= nfs_show_path
,
318 .show_stats
= nfs_show_stats
,
319 .remount_fs
= nfs_remount
,
321 EXPORT_SYMBOL_GPL(nfs_sops
);
323 #if IS_ENABLED(CONFIG_NFS_V4)
324 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*);
325 static int nfs4_validate_mount_data(void *options
,
326 struct nfs_parsed_mount_data
*args
, const char *dev_name
);
328 struct file_system_type nfs4_fs_type
= {
329 .owner
= THIS_MODULE
,
331 .mount
= nfs_fs_mount
,
332 .kill_sb
= nfs_kill_super
,
333 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
335 EXPORT_SYMBOL_GPL(nfs4_fs_type
);
337 static int __init
register_nfs4_fs(void)
339 return register_filesystem(&nfs4_fs_type
);
342 static void unregister_nfs4_fs(void)
344 unregister_filesystem(&nfs4_fs_type
);
347 static int __init
register_nfs4_fs(void)
352 static void unregister_nfs4_fs(void)
357 static struct shrinker acl_shrinker
= {
358 .shrink
= nfs_access_cache_shrinker
,
359 .seeks
= DEFAULT_SEEKS
,
363 * Register the NFS filesystems
365 int __init
register_nfs_fs(void)
369 ret
= register_filesystem(&nfs_fs_type
);
373 ret
= register_nfs4_fs();
377 ret
= nfs_register_sysctl();
380 register_shrinker(&acl_shrinker
);
384 unregister_nfs4_fs();
386 unregister_filesystem(&nfs_fs_type
);
392 * Unregister the NFS filesystems
394 void __exit
unregister_nfs_fs(void)
396 unregister_shrinker(&acl_shrinker
);
397 nfs_unregister_sysctl();
398 unregister_nfs4_fs();
399 unregister_filesystem(&nfs_fs_type
);
402 void nfs_sb_active(struct super_block
*sb
)
404 struct nfs_server
*server
= NFS_SB(sb
);
406 if (atomic_inc_return(&server
->active
) == 1)
407 atomic_inc(&sb
->s_active
);
409 EXPORT_SYMBOL_GPL(nfs_sb_active
);
411 void nfs_sb_deactive(struct super_block
*sb
)
413 struct nfs_server
*server
= NFS_SB(sb
);
415 if (atomic_dec_and_test(&server
->active
))
416 deactivate_super(sb
);
418 EXPORT_SYMBOL_GPL(nfs_sb_deactive
);
421 * Deliver file system statistics to userspace
423 int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
425 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
426 unsigned char blockbits
;
427 unsigned long blockres
;
428 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
429 struct nfs_fsstat res
;
432 res
.fattr
= nfs_alloc_fattr();
433 if (res
.fattr
== NULL
)
436 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
437 if (unlikely(error
== -ESTALE
)) {
438 struct dentry
*pd_dentry
;
440 pd_dentry
= dget_parent(dentry
);
441 if (pd_dentry
!= NULL
) {
442 nfs_zap_caches(pd_dentry
->d_inode
);
446 nfs_free_fattr(res
.fattr
);
450 buf
->f_type
= NFS_SUPER_MAGIC
;
453 * Current versions of glibc do not correctly handle the
454 * case where f_frsize != f_bsize. Eventually we want to
455 * report the value of wtmult in this field.
457 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
460 * On most *nix systems, f_blocks, f_bfree, and f_bavail
461 * are reported in units of f_frsize. Linux hasn't had
462 * an f_frsize field in its statfs struct until recently,
463 * thus historically Linux's sys_statfs reports these
464 * fields in units of f_bsize.
466 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
467 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
468 blockres
= (1 << blockbits
) - 1;
469 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
470 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
471 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
473 buf
->f_files
= res
.tfiles
;
474 buf
->f_ffree
= res
.afiles
;
476 buf
->f_namelen
= server
->namelen
;
481 dprintk("%s: statfs error = %d\n", __func__
, -error
);
484 EXPORT_SYMBOL_GPL(nfs_statfs
);
487 * Map the security flavour number to a name
489 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
491 static const struct {
492 rpc_authflavor_t flavour
;
495 { RPC_AUTH_NULL
, "null" },
496 { RPC_AUTH_UNIX
, "sys" },
497 { RPC_AUTH_GSS_KRB5
, "krb5" },
498 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
499 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
500 { RPC_AUTH_GSS_LKEY
, "lkey" },
501 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
502 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
503 { RPC_AUTH_GSS_SPKM
, "spkm" },
504 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
505 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
506 { UINT_MAX
, "unknown" }
510 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
511 if (sec_flavours
[i
].flavour
== flavour
)
514 return sec_flavours
[i
].str
;
517 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
520 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
522 seq_printf(m
, ",mountproto=");
523 switch (sap
->sa_family
) {
525 switch (nfss
->mountd_protocol
) {
527 seq_printf(m
, RPCBIND_NETID_UDP
);
530 seq_printf(m
, RPCBIND_NETID_TCP
);
534 seq_printf(m
, "auto");
538 switch (nfss
->mountd_protocol
) {
540 seq_printf(m
, RPCBIND_NETID_UDP6
);
543 seq_printf(m
, RPCBIND_NETID_TCP6
);
547 seq_printf(m
, "auto");
552 seq_printf(m
, "auto");
556 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
559 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
561 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
564 switch (sap
->sa_family
) {
566 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
567 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
571 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
572 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
577 seq_printf(m
, ",mountaddr=unspecified");
580 if (nfss
->mountd_version
|| showdefaults
)
581 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
582 if ((nfss
->mountd_port
&&
583 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
585 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
587 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
590 #if IS_ENABLED(CONFIG_NFS_V4)
591 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
594 struct nfs_client
*clp
= nfss
->nfs_client
;
596 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
599 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
605 static void nfs_show_nfs_version(struct seq_file
*m
,
606 unsigned int version
,
607 unsigned int minorversion
)
609 seq_printf(m
, ",vers=%u", version
);
611 seq_printf(m
, ".%u", minorversion
);
615 * Describe the mount options in force on this server representation
617 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
620 static const struct proc_nfs_info
{
625 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
626 { NFS_MOUNT_POSIX
, ",posix", "" },
627 { NFS_MOUNT_NOCTO
, ",nocto", "" },
628 { NFS_MOUNT_NOAC
, ",noac", "" },
629 { NFS_MOUNT_NONLM
, ",nolock", "" },
630 { NFS_MOUNT_NOACL
, ",noacl", "" },
631 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
632 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
633 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
636 const struct proc_nfs_info
*nfs_infop
;
637 struct nfs_client
*clp
= nfss
->nfs_client
;
638 u32 version
= clp
->rpc_ops
->version
;
639 int local_flock
, local_fcntl
;
641 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
642 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
643 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
644 if (nfss
->bsize
!= 0)
645 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
646 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
647 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
648 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
649 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
650 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
651 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
652 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
653 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
654 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
655 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
656 if (nfss
->flags
& nfs_infop
->flag
)
657 seq_puts(m
, nfs_infop
->str
);
659 seq_puts(m
, nfs_infop
->nostr
);
662 seq_printf(m
, ",proto=%s",
663 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
666 if (nfss
->port
!= NFS_PORT
)
667 seq_printf(m
, ",port=%u", nfss
->port
);
670 seq_printf(m
, ",port=%u", nfss
->port
);
672 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
673 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
674 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
677 nfs_show_mountd_options(m
, nfss
, showdefaults
);
679 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
681 if (nfss
->options
& NFS_OPTION_FSCACHE
)
682 seq_printf(m
, ",fsc");
684 if (nfss
->options
& NFS_OPTION_MIGRATION
)
685 seq_printf(m
, ",migration");
687 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
688 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
689 seq_printf(m
, ",lookupcache=none");
691 seq_printf(m
, ",lookupcache=pos");
694 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
695 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
697 if (!local_flock
&& !local_fcntl
)
698 seq_printf(m
, ",local_lock=none");
699 else if (local_flock
&& local_fcntl
)
700 seq_printf(m
, ",local_lock=all");
701 else if (local_flock
)
702 seq_printf(m
, ",local_lock=flock");
704 seq_printf(m
, ",local_lock=posix");
708 * Describe the mount options on this VFS mountpoint
710 int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
712 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
714 nfs_show_mount_options(m
, nfss
, 0);
717 seq_printf(m
, ",addr=%s",
718 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
724 EXPORT_SYMBOL_GPL(nfs_show_options
);
726 #if IS_ENABLED(CONFIG_NFS_V4)
727 #ifdef CONFIG_NFS_V4_1
728 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
730 if (nfs4_has_session(server
->nfs_client
))
731 seq_printf(m
, ",sessions");
734 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
738 #ifdef CONFIG_NFS_V4_1
739 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
741 seq_printf(m
, ",pnfs=");
742 if (server
->pnfs_curr_ld
)
743 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
745 seq_printf(m
, "not configured");
748 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
750 if (nfss
->nfs_client
&& nfss
->nfs_client
->cl_implid
) {
751 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->cl_implid
;
752 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
754 impl_id
->name
, impl_id
->domain
,
755 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
759 #if IS_ENABLED(CONFIG_NFS_V4)
760 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
764 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
769 int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
771 char *page
= (char *) __get_free_page(GFP_KERNEL
);
772 char *devname
, *dummy
;
776 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
, 0);
778 err
= PTR_ERR(devname
);
780 seq_escape(m
, devname
, " \t\n\\");
781 free_page((unsigned long)page
);
784 EXPORT_SYMBOL_GPL(nfs_show_devname
);
786 int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
791 EXPORT_SYMBOL_GPL(nfs_show_path
);
794 * Present statistical information for this VFS mountpoint
796 int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
799 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
800 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
801 struct nfs_iostats totals
= { };
803 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
806 * Display all mount option settings
808 seq_printf(m
, "\n\topts:\t");
809 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
810 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
811 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
812 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
813 nfs_show_mount_options(m
, nfss
, 1);
815 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
817 show_implementation_id(m
, nfss
);
819 seq_printf(m
, "\n\tcaps:\t");
820 seq_printf(m
, "caps=0x%x", nfss
->caps
);
821 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
822 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
823 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
824 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
826 #if IS_ENABLED(CONFIG_NFS_V4)
827 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
828 seq_printf(m
, "\n\tnfsv4:\t");
829 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
830 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
831 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
832 show_sessions(m
, nfss
);
838 * Display security flavor in effect for this mount
840 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
842 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
845 * Display superblock I/O counters
847 for_each_possible_cpu(cpu
) {
848 struct nfs_iostats
*stats
;
851 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
853 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
854 totals
.events
[i
] += stats
->events
[i
];
855 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
856 totals
.bytes
[i
] += stats
->bytes
[i
];
857 #ifdef CONFIG_NFS_FSCACHE
858 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
859 totals
.fscache
[i
] += stats
->fscache
[i
];
865 seq_printf(m
, "\n\tevents:\t");
866 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
867 seq_printf(m
, "%lu ", totals
.events
[i
]);
868 seq_printf(m
, "\n\tbytes:\t");
869 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
870 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
871 #ifdef CONFIG_NFS_FSCACHE
872 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
873 seq_printf(m
, "\n\tfsc:\t");
874 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
875 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
880 rpc_print_iostats(m
, nfss
->client
);
884 EXPORT_SYMBOL_GPL(nfs_show_stats
);
887 * Begin unmount by attempting to remove all automounted mountpoints we added
888 * in response to xdev traversals and referrals
890 void nfs_umount_begin(struct super_block
*sb
)
892 struct nfs_server
*server
;
893 struct rpc_clnt
*rpc
;
896 /* -EIO all pending I/O */
897 rpc
= server
->client_acl
;
899 rpc_killall_tasks(rpc
);
900 rpc
= server
->client
;
902 rpc_killall_tasks(rpc
);
904 EXPORT_SYMBOL_GPL(nfs_umount_begin
);
906 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(void)
908 struct nfs_parsed_mount_data
*data
;
910 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
912 data
->acregmin
= NFS_DEF_ACREGMIN
;
913 data
->acregmax
= NFS_DEF_ACREGMAX
;
914 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
915 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
916 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
917 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
918 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
919 data
->auth_flavors
[0] = RPC_AUTH_UNIX
;
920 data
->auth_flavor_len
= 1;
921 data
->minorversion
= 0;
922 data
->need_mount
= true;
923 data
->net
= current
->nsproxy
->net_ns
;
924 security_init_mnt_opts(&data
->lsm_opts
);
929 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data
*data
)
932 kfree(data
->client_address
);
933 kfree(data
->mount_server
.hostname
);
934 kfree(data
->nfs_server
.export_path
);
935 kfree(data
->nfs_server
.hostname
);
936 kfree(data
->fscache_uniq
);
937 security_free_mnt_opts(&data
->lsm_opts
);
943 * Sanity-check a server address provided by the mount command.
945 * Address family must be initialized, and address must not be
946 * the ANY address for that family.
948 static int nfs_verify_server_address(struct sockaddr
*addr
)
950 switch (addr
->sa_family
) {
952 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
953 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
956 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
957 return !ipv6_addr_any(sa
);
961 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
966 * Select between a default port value and a user-specified port value.
967 * If a zero value is set, then autobind will be used.
969 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
970 const unsigned short default_port
)
972 if (*port
== NFS_UNSPEC_PORT
)
973 *port
= default_port
;
975 rpc_set_port(sap
, *port
);
979 * Sanity check the NFS transport protocol.
982 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
984 switch (mnt
->nfs_server
.protocol
) {
985 case XPRT_TRANSPORT_UDP
:
986 case XPRT_TRANSPORT_TCP
:
987 case XPRT_TRANSPORT_RDMA
:
990 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
995 * For text based NFSv2/v3 mounts, the mount protocol transport default
996 * settings should depend upon the specified NFS transport.
998 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
1000 nfs_validate_transport_protocol(mnt
);
1002 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
1003 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
1005 switch (mnt
->nfs_server
.protocol
) {
1006 case XPRT_TRANSPORT_UDP
:
1007 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1009 case XPRT_TRANSPORT_TCP
:
1010 case XPRT_TRANSPORT_RDMA
:
1011 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1016 * Parse the value of the 'sec=' option.
1018 static int nfs_parse_security_flavors(char *value
,
1019 struct nfs_parsed_mount_data
*mnt
)
1021 substring_t args
[MAX_OPT_ARGS
];
1023 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1025 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
1027 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
1030 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1033 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
1036 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
1039 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
1042 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
1045 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
1048 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1051 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1054 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1057 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1063 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1064 mnt
->auth_flavor_len
= 1;
1068 static int nfs_parse_version_string(char *string
,
1069 struct nfs_parsed_mount_data
*mnt
,
1072 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1073 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1078 mnt
->flags
|= NFS_MOUNT_VER3
;
1082 /* Backward compatibility option. In future,
1083 * the mount program should always supply
1084 * a NFSv4 minor version number.
1090 mnt
->minorversion
= 0;
1094 mnt
->minorversion
= 1;
1102 static int nfs_get_option_str(substring_t args
[], char **option
)
1105 *option
= match_strdup(args
);
1109 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1114 string
= match_strdup(args
);
1117 rc
= kstrtoul(string
, 10, option
);
1124 * Error-check and convert a string of mount options from user space into
1125 * a data structure. The whole mount string is processed; bad options are
1126 * skipped as they are encountered. If there were no errors, return 1;
1127 * otherwise return 0 (zero).
1129 static int nfs_parse_mount_options(char *raw
,
1130 struct nfs_parsed_mount_data
*mnt
)
1132 char *p
, *string
, *secdata
;
1133 int rc
, sloppy
= 0, invalid_option
= 0;
1134 unsigned short protofamily
= AF_UNSPEC
;
1135 unsigned short mountfamily
= AF_UNSPEC
;
1138 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1141 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1143 secdata
= alloc_secdata();
1147 rc
= security_sb_copy_data(raw
, secdata
);
1149 goto out_security_failure
;
1151 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1153 goto out_security_failure
;
1155 free_secdata(secdata
);
1157 while ((p
= strsep(&raw
, ",")) != NULL
) {
1158 substring_t args
[MAX_OPT_ARGS
];
1159 unsigned long option
;
1165 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1167 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1171 * boolean options: foo/nofoo
1174 mnt
->flags
|= NFS_MOUNT_SOFT
;
1177 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1180 mnt
->flags
|= NFS_MOUNT_POSIX
;
1183 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1186 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1189 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1192 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1195 mnt
->flags
|= NFS_MOUNT_NOAC
;
1198 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1199 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1200 NFS_MOUNT_LOCAL_FCNTL
);
1203 mnt
->flags
|= NFS_MOUNT_NONLM
;
1204 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1205 NFS_MOUNT_LOCAL_FCNTL
);
1208 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1209 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1212 mnt
->flags
|= NFS_MOUNT_TCP
;
1213 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1216 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1217 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1218 xprt_load_transport(p
);
1221 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1224 mnt
->flags
|= NFS_MOUNT_NOACL
;
1227 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1229 case Opt_nordirplus
:
1230 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1232 case Opt_sharecache
:
1233 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1235 case Opt_nosharecache
:
1236 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1239 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1241 case Opt_noresvport
:
1242 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1245 mnt
->options
|= NFS_OPTION_FSCACHE
;
1246 kfree(mnt
->fscache_uniq
);
1247 mnt
->fscache_uniq
= NULL
;
1250 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1251 kfree(mnt
->fscache_uniq
);
1252 mnt
->fscache_uniq
= NULL
;
1255 mnt
->options
|= NFS_OPTION_MIGRATION
;
1257 case Opt_nomigration
:
1258 mnt
->options
&= NFS_OPTION_MIGRATION
;
1262 * options that take numeric values
1265 if (nfs_get_option_ul(args
, &option
) ||
1267 goto out_invalid_value
;
1268 mnt
->nfs_server
.port
= option
;
1271 if (nfs_get_option_ul(args
, &option
))
1272 goto out_invalid_value
;
1273 mnt
->rsize
= option
;
1276 if (nfs_get_option_ul(args
, &option
))
1277 goto out_invalid_value
;
1278 mnt
->wsize
= option
;
1281 if (nfs_get_option_ul(args
, &option
))
1282 goto out_invalid_value
;
1283 mnt
->bsize
= option
;
1286 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1287 goto out_invalid_value
;
1288 mnt
->timeo
= option
;
1291 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1292 goto out_invalid_value
;
1293 mnt
->retrans
= option
;
1296 if (nfs_get_option_ul(args
, &option
))
1297 goto out_invalid_value
;
1298 mnt
->acregmin
= option
;
1301 if (nfs_get_option_ul(args
, &option
))
1302 goto out_invalid_value
;
1303 mnt
->acregmax
= option
;
1306 if (nfs_get_option_ul(args
, &option
))
1307 goto out_invalid_value
;
1308 mnt
->acdirmin
= option
;
1311 if (nfs_get_option_ul(args
, &option
))
1312 goto out_invalid_value
;
1313 mnt
->acdirmax
= option
;
1316 if (nfs_get_option_ul(args
, &option
))
1317 goto out_invalid_value
;
1318 mnt
->acregmin
= mnt
->acregmax
=
1319 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1322 if (nfs_get_option_ul(args
, &option
))
1323 goto out_invalid_value
;
1324 mnt
->namlen
= option
;
1327 if (nfs_get_option_ul(args
, &option
) ||
1329 goto out_invalid_value
;
1330 mnt
->mount_server
.port
= option
;
1333 if (nfs_get_option_ul(args
, &option
) ||
1334 option
< NFS_MNT_VERSION
||
1335 option
> NFS_MNT3_VERSION
)
1336 goto out_invalid_value
;
1337 mnt
->mount_server
.version
= option
;
1339 case Opt_minorversion
:
1340 if (nfs_get_option_ul(args
, &option
))
1341 goto out_invalid_value
;
1342 if (option
> NFS4_MAX_MINOR_VERSION
)
1343 goto out_invalid_value
;
1344 mnt
->minorversion
= option
;
1348 * options that take text values
1351 string
= match_strdup(args
);
1354 rc
= nfs_parse_version_string(string
, mnt
, args
);
1357 goto out_invalid_value
;
1360 string
= match_strdup(args
);
1363 rc
= nfs_parse_security_flavors(string
, mnt
);
1366 dfprintk(MOUNT
, "NFS: unrecognized "
1367 "security flavor\n");
1372 string
= match_strdup(args
);
1375 token
= match_token(string
,
1376 nfs_xprt_protocol_tokens
, args
);
1378 protofamily
= AF_INET
;
1381 protofamily
= AF_INET6
;
1383 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1384 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1387 protofamily
= AF_INET6
;
1389 mnt
->flags
|= NFS_MOUNT_TCP
;
1390 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1393 /* vector side protocols to TCP */
1394 mnt
->flags
|= NFS_MOUNT_TCP
;
1395 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1396 xprt_load_transport(string
);
1399 dfprintk(MOUNT
, "NFS: unrecognized "
1400 "transport protocol\n");
1406 case Opt_mountproto
:
1407 string
= match_strdup(args
);
1410 token
= match_token(string
,
1411 nfs_xprt_protocol_tokens
, args
);
1414 mountfamily
= AF_INET
;
1417 mountfamily
= AF_INET6
;
1419 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1422 mountfamily
= AF_INET6
;
1424 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1426 case Opt_xprt_rdma
: /* not used for side protocols */
1428 dfprintk(MOUNT
, "NFS: unrecognized "
1429 "transport protocol\n");
1434 string
= match_strdup(args
);
1437 mnt
->nfs_server
.addrlen
=
1438 rpc_pton(mnt
->net
, string
, strlen(string
),
1440 &mnt
->nfs_server
.address
,
1441 sizeof(mnt
->nfs_server
.address
));
1443 if (mnt
->nfs_server
.addrlen
== 0)
1444 goto out_invalid_address
;
1446 case Opt_clientaddr
:
1447 if (nfs_get_option_str(args
, &mnt
->client_address
))
1451 if (nfs_get_option_str(args
,
1452 &mnt
->mount_server
.hostname
))
1456 string
= match_strdup(args
);
1459 mnt
->mount_server
.addrlen
=
1460 rpc_pton(mnt
->net
, string
, strlen(string
),
1462 &mnt
->mount_server
.address
,
1463 sizeof(mnt
->mount_server
.address
));
1465 if (mnt
->mount_server
.addrlen
== 0)
1466 goto out_invalid_address
;
1468 case Opt_lookupcache
:
1469 string
= match_strdup(args
);
1472 token
= match_token(string
,
1473 nfs_lookupcache_tokens
, args
);
1476 case Opt_lookupcache_all
:
1477 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1479 case Opt_lookupcache_positive
:
1480 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1481 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1483 case Opt_lookupcache_none
:
1484 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1487 dfprintk(MOUNT
, "NFS: invalid "
1488 "lookupcache argument\n");
1492 case Opt_fscache_uniq
:
1493 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1495 mnt
->options
|= NFS_OPTION_FSCACHE
;
1497 case Opt_local_lock
:
1498 string
= match_strdup(args
);
1501 token
= match_token(string
, nfs_local_lock_tokens
,
1505 case Opt_local_lock_all
:
1506 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1507 NFS_MOUNT_LOCAL_FCNTL
);
1509 case Opt_local_lock_flock
:
1510 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1512 case Opt_local_lock_posix
:
1513 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1515 case Opt_local_lock_none
:
1516 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1517 NFS_MOUNT_LOCAL_FCNTL
);
1520 dfprintk(MOUNT
, "NFS: invalid "
1521 "local_lock argument\n");
1531 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1534 case Opt_deprecated
:
1535 dfprintk(MOUNT
, "NFS: ignoring mount option "
1541 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1546 if (!sloppy
&& invalid_option
)
1549 if (mnt
->minorversion
&& mnt
->version
!= 4)
1550 goto out_minorversion_mismatch
;
1552 if (mnt
->options
& NFS_OPTION_MIGRATION
&&
1553 mnt
->version
!= 4 && mnt
->minorversion
!= 0)
1554 goto out_migration_misuse
;
1557 * verify that any proto=/mountproto= options match the address
1558 * families in the addr=/mountaddr= options.
1560 if (protofamily
!= AF_UNSPEC
&&
1561 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1562 goto out_proto_mismatch
;
1564 if (mountfamily
!= AF_UNSPEC
) {
1565 if (mnt
->mount_server
.addrlen
) {
1566 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1567 goto out_mountproto_mismatch
;
1569 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1570 goto out_mountproto_mismatch
;
1576 out_mountproto_mismatch
:
1577 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1581 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1583 out_invalid_address
:
1584 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1587 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1589 out_minorversion_mismatch
:
1590 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1591 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1593 out_migration_misuse
:
1595 "NFS: 'migration' not supported for this NFS version\n");
1598 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1600 out_security_failure
:
1601 free_secdata(secdata
);
1602 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1607 * Match the requested auth flavors with the list returned by
1608 * the server. Returns zero and sets the mount's authentication
1609 * flavor on success; returns -EACCES if server does not support
1610 * the requested flavor.
1612 static int nfs_walk_authlist(struct nfs_parsed_mount_data
*args
,
1613 struct nfs_mount_request
*request
)
1615 unsigned int i
, j
, server_authlist_len
= *(request
->auth_flav_len
);
1618 * Certain releases of Linux's mountd return an empty
1619 * flavor list. To prevent behavioral regression with
1620 * these servers (ie. rejecting mounts that used to
1621 * succeed), revert to pre-2.6.32 behavior (no checking)
1622 * if the returned flavor list is empty.
1624 if (server_authlist_len
== 0)
1628 * We avoid sophisticated negotiating here, as there are
1629 * plenty of cases where we can get it wrong, providing
1630 * either too little or too much security.
1632 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1633 * flavor listed first. However, some servers list
1634 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1635 * preferred default, in args->auth_flavors[0] if user
1636 * didn't specify sec= mount option.
1638 for (i
= 0; i
< args
->auth_flavor_len
; i
++)
1639 for (j
= 0; j
< server_authlist_len
; j
++)
1640 if (args
->auth_flavors
[i
] == request
->auth_flavs
[j
]) {
1641 dfprintk(MOUNT
, "NFS: using auth flavor %d\n",
1642 request
->auth_flavs
[j
]);
1643 args
->auth_flavors
[0] = request
->auth_flavs
[j
];
1647 dfprintk(MOUNT
, "NFS: server does not support requested auth flavor\n");
1648 nfs_umount(request
);
1653 * Use the remote server's MOUNT service to request the NFS file handle
1654 * corresponding to the provided path.
1656 static int nfs_request_mount(struct nfs_parsed_mount_data
*args
,
1657 struct nfs_fh
*root_fh
)
1659 rpc_authflavor_t server_authlist
[NFS_MAX_SECFLAVORS
];
1660 unsigned int server_authlist_len
= ARRAY_SIZE(server_authlist
);
1661 struct nfs_mount_request request
= {
1662 .sap
= (struct sockaddr
*)
1663 &args
->mount_server
.address
,
1664 .dirpath
= args
->nfs_server
.export_path
,
1665 .protocol
= args
->mount_server
.protocol
,
1667 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1668 .auth_flav_len
= &server_authlist_len
,
1669 .auth_flavs
= server_authlist
,
1674 if (args
->mount_server
.version
== 0) {
1675 switch (args
->version
) {
1677 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1680 args
->mount_server
.version
= NFS_MNT_VERSION
;
1683 request
.version
= args
->mount_server
.version
;
1685 if (args
->mount_server
.hostname
)
1686 request
.hostname
= args
->mount_server
.hostname
;
1688 request
.hostname
= args
->nfs_server
.hostname
;
1691 * Construct the mount server's address.
1693 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1694 memcpy(request
.sap
, &args
->nfs_server
.address
,
1695 args
->nfs_server
.addrlen
);
1696 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1698 request
.salen
= args
->mount_server
.addrlen
;
1699 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1702 * Now ask the mount server to map our export path
1705 status
= nfs_mount(&request
);
1707 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1708 request
.hostname
, status
);
1713 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1715 if (args
->mount_server
.version
!= NFS_MNT3_VERSION
)
1717 return nfs_walk_authlist(args
, &request
);
1720 struct dentry
*nfs_try_mount(int flags
, const char *dev_name
,
1721 struct nfs_mount_info
*mount_info
,
1722 struct nfs_subversion
*nfs_mod
)
1725 struct nfs_server
*server
;
1727 if (mount_info
->parsed
->need_mount
) {
1728 status
= nfs_request_mount(mount_info
->parsed
, mount_info
->mntfh
);
1730 return ERR_PTR(status
);
1733 /* Get a volume representation */
1734 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1736 return ERR_CAST(server
);
1738 return nfs_fs_mount_common(server
, flags
, dev_name
, mount_info
, nfs_mod
);
1740 EXPORT_SYMBOL_GPL(nfs_try_mount
);
1743 * Split "dev_name" into "hostname:export_path".
1745 * The leftmost colon demarks the split between the server's hostname
1746 * and the export path. If the hostname starts with a left square
1747 * bracket, then it may contain colons.
1749 * Note: caller frees hostname and export path, even on error.
1751 static int nfs_parse_devname(const char *dev_name
,
1752 char **hostname
, size_t maxnamlen
,
1753 char **export_path
, size_t maxpathlen
)
1758 /* Is the host name protected with square brakcets? */
1759 if (*dev_name
== '[') {
1760 end
= strchr(++dev_name
, ']');
1761 if (end
== NULL
|| end
[1] != ':')
1762 goto out_bad_devname
;
1764 len
= end
- dev_name
;
1769 end
= strchr(dev_name
, ':');
1771 goto out_bad_devname
;
1772 len
= end
- dev_name
;
1774 /* kill possible hostname list: not supported */
1775 comma
= strchr(dev_name
, ',');
1776 if (comma
!= NULL
&& comma
< end
)
1780 if (len
> maxnamlen
)
1783 /* N.B. caller will free nfs_server.hostname in all cases */
1784 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1785 if (*hostname
== NULL
)
1787 len
= strlen(++end
);
1788 if (len
> maxpathlen
)
1790 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1794 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1798 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1802 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1806 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1807 return -ENAMETOOLONG
;
1810 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1811 return -ENAMETOOLONG
;
1815 * Validate the NFS2/NFS3 mount data
1816 * - fills in the mount root filehandle
1818 * For option strings, user space handles the following behaviors:
1820 * + DNS: mapping server host name to IP address ("addr=" option)
1822 * + failure mode: how to behave if a mount request can't be handled
1823 * immediately ("fg/bg" option)
1825 * + retry: how often to retry a mount request ("retry=" option)
1827 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1828 * mountproto=tcp after mountproto=udp, and so on
1830 static int nfs23_validate_mount_data(void *options
,
1831 struct nfs_parsed_mount_data
*args
,
1832 struct nfs_fh
*mntfh
,
1833 const char *dev_name
)
1835 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1836 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1841 args
->version
= NFS_DEFAULT_VERSION
;
1842 switch (data
->version
) {
1848 if (data
->flags
& NFS_MOUNT_VER3
)
1850 data
->root
.size
= NFS2_FHSIZE
;
1851 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1853 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1856 memset(data
->context
, 0, sizeof(data
->context
));
1858 if (data
->flags
& NFS_MOUNT_VER3
) {
1859 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1860 goto out_invalid_fh
;
1861 mntfh
->size
= data
->root
.size
;
1864 mntfh
->size
= NFS2_FHSIZE
;
1869 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1870 if (mntfh
->size
< sizeof(mntfh
->data
))
1871 memset(mntfh
->data
+ mntfh
->size
, 0,
1872 sizeof(mntfh
->data
) - mntfh
->size
);
1875 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1878 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1879 args
->flags
|= NFS_MOUNT_LEGACY_INTERFACE
;
1880 args
->rsize
= data
->rsize
;
1881 args
->wsize
= data
->wsize
;
1882 args
->timeo
= data
->timeo
;
1883 args
->retrans
= data
->retrans
;
1884 args
->acregmin
= data
->acregmin
;
1885 args
->acregmax
= data
->acregmax
;
1886 args
->acdirmin
= data
->acdirmin
;
1887 args
->acdirmax
= data
->acdirmax
;
1888 args
->need_mount
= false;
1890 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1891 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1892 args
->nfs_server
.port
= ntohs(data
->addr
.sin_port
);
1893 if (!nfs_verify_server_address(sap
))
1894 goto out_no_address
;
1896 if (!(data
->flags
& NFS_MOUNT_TCP
))
1897 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1898 /* N.B. caller will free nfs_server.hostname in all cases */
1899 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1900 args
->namlen
= data
->namlen
;
1901 args
->bsize
= data
->bsize
;
1903 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1904 args
->auth_flavors
[0] = data
->pseudoflavor
;
1905 if (!args
->nfs_server
.hostname
)
1908 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1909 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1910 NFS_MOUNT_LOCAL_FCNTL
);
1912 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1913 NFS_MOUNT_LOCAL_FCNTL
);
1915 * The legacy version 6 binary mount data from userspace has a
1916 * field used only to transport selinux information into the
1917 * the kernel. To continue to support that functionality we
1918 * have a touch of selinux knowledge here in the NFS code. The
1919 * userspace code converted context=blah to just blah so we are
1920 * converting back to the full string selinux understands.
1922 if (data
->context
[0]){
1923 #ifdef CONFIG_SECURITY_SELINUX
1925 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1928 strcpy(opts_str
, "context=");
1929 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1930 strcat(opts_str
, &data
->context
[0]);
1931 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1942 return NFS_TEXT_DATA
;
1945 #if !IS_ENABLED(CONFIG_NFS_V3)
1946 if (args
->version
== 3)
1947 goto out_v3_not_compiled
;
1948 #endif /* !CONFIG_NFS_V3 */
1953 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1957 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1962 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1965 #if !IS_ENABLED(CONFIG_NFS_V3)
1966 out_v3_not_compiled
:
1967 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1968 return -EPROTONOSUPPORT
;
1969 #endif /* !CONFIG_NFS_V3 */
1972 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1976 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1980 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1984 #if IS_ENABLED(CONFIG_NFS_V4)
1985 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1987 struct nfs_parsed_mount_data
*args
,
1988 struct nfs_fh
*mntfh
,
1989 const char *dev_name
)
1991 if (fs_type
== &nfs_fs_type
)
1992 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
1993 return nfs4_validate_mount_data(options
, args
, dev_name
);
1996 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1998 struct nfs_parsed_mount_data
*args
,
1999 struct nfs_fh
*mntfh
,
2000 const char *dev_name
)
2002 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2006 static int nfs_validate_text_mount_data(void *options
,
2007 struct nfs_parsed_mount_data
*args
,
2008 const char *dev_name
)
2011 int max_namelen
= PAGE_SIZE
;
2012 int max_pathlen
= NFS_MAXPATHLEN
;
2013 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2015 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2018 if (!nfs_verify_server_address(sap
))
2019 goto out_no_address
;
2021 if (args
->version
== 4) {
2022 #if IS_ENABLED(CONFIG_NFS_V4)
2024 max_namelen
= NFS4_MAXNAMLEN
;
2025 max_pathlen
= NFS4_MAXPATHLEN
;
2026 nfs_validate_transport_protocol(args
);
2027 nfs4_validate_mount_flags(args
);
2029 goto out_v4_not_compiled
;
2030 #endif /* CONFIG_NFS_V4 */
2032 nfs_set_mount_transport_protocol(args
);
2034 nfs_set_port(sap
, &args
->nfs_server
.port
, port
);
2036 if (args
->auth_flavor_len
> 1)
2039 return nfs_parse_devname(dev_name
,
2040 &args
->nfs_server
.hostname
,
2042 &args
->nfs_server
.export_path
,
2045 #if !IS_ENABLED(CONFIG_NFS_V4)
2046 out_v4_not_compiled
:
2047 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2048 return -EPROTONOSUPPORT
;
2049 #endif /* !CONFIG_NFS_V4 */
2052 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2056 dfprintk(MOUNT
, "NFS: Too many RPC auth flavours specified\n");
2061 nfs_compare_remount_data(struct nfs_server
*nfss
,
2062 struct nfs_parsed_mount_data
*data
)
2064 if (data
->flags
!= nfss
->flags
||
2065 data
->rsize
!= nfss
->rsize
||
2066 data
->wsize
!= nfss
->wsize
||
2067 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
2068 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
2069 data
->acregmin
!= nfss
->acregmin
/ HZ
||
2070 data
->acregmax
!= nfss
->acregmax
/ HZ
||
2071 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
2072 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
2073 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
2074 data
->nfs_server
.port
!= nfss
->port
||
2075 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
2076 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
2077 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
2084 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
2087 struct nfs_server
*nfss
= sb
->s_fs_info
;
2088 struct nfs_parsed_mount_data
*data
;
2089 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
2090 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
2091 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
2094 * Userspace mount programs that send binary options generally send
2095 * them populated with default values. We have no way to know which
2096 * ones were explicitly specified. Fall back to legacy behavior and
2097 * just return success.
2099 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2100 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2101 options
->version
<= 6))))
2104 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2108 /* fill out struct with values from existing mount */
2109 data
->flags
= nfss
->flags
;
2110 data
->rsize
= nfss
->rsize
;
2111 data
->wsize
= nfss
->wsize
;
2112 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2113 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
2114 data
->acregmin
= nfss
->acregmin
/ HZ
;
2115 data
->acregmax
= nfss
->acregmax
/ HZ
;
2116 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2117 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2118 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2119 data
->nfs_server
.port
= nfss
->port
;
2120 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2121 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2122 data
->nfs_server
.addrlen
);
2124 /* overwrite those values with any that were specified */
2125 error
= nfs_parse_mount_options((char *)options
, data
);
2130 * noac is a special case. It implies -o sync, but that's not
2131 * necessarily reflected in the mtab options. do_remount_sb
2132 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2133 * remount options, so we have to explicitly reset it.
2135 if (data
->flags
& NFS_MOUNT_NOAC
)
2136 *flags
|= MS_SYNCHRONOUS
;
2138 /* compare new mount options with old ones */
2139 error
= nfs_compare_remount_data(nfss
, data
);
2144 EXPORT_SYMBOL_GPL(nfs_remount
);
2147 * Initialise the common bits of the superblock
2149 inline void nfs_initialise_sb(struct super_block
*sb
)
2151 struct nfs_server
*server
= NFS_SB(sb
);
2153 sb
->s_magic
= NFS_SUPER_MAGIC
;
2155 /* We probably want something more informative here */
2156 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2157 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2159 if (sb
->s_blocksize
== 0)
2160 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2161 &sb
->s_blocksize_bits
);
2163 sb
->s_bdi
= &server
->backing_dev_info
;
2165 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2169 * Finish setting up an NFS2/3 superblock
2171 void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2173 struct nfs_parsed_mount_data
*data
= mount_info
->parsed
;
2174 struct nfs_server
*server
= NFS_SB(sb
);
2176 sb
->s_blocksize_bits
= 0;
2177 sb
->s_blocksize
= 0;
2178 sb
->s_xattr
= server
->nfs_client
->cl_nfs_mod
->xattr
;
2179 sb
->s_op
= server
->nfs_client
->cl_nfs_mod
->sops
;
2180 if (data
&& data
->bsize
)
2181 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2183 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2184 /* The VFS shouldn't apply the umask to mode bits. We will do
2185 * so ourselves when necessary.
2187 sb
->s_flags
|= MS_POSIXACL
;
2188 sb
->s_time_gran
= 1;
2191 nfs_initialise_sb(sb
);
2193 EXPORT_SYMBOL_GPL(nfs_fill_super
);
2196 * Finish setting up a cloned NFS2/3/4 superblock
2198 void nfs_clone_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2200 const struct super_block
*old_sb
= mount_info
->cloned
->sb
;
2201 struct nfs_server
*server
= NFS_SB(sb
);
2203 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2204 sb
->s_blocksize
= old_sb
->s_blocksize
;
2205 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2206 sb
->s_xattr
= old_sb
->s_xattr
;
2207 sb
->s_op
= old_sb
->s_op
;
2208 sb
->s_time_gran
= 1;
2210 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2211 /* The VFS shouldn't apply the umask to mode bits. We will do
2212 * so ourselves when necessary.
2214 sb
->s_flags
|= MS_POSIXACL
;
2217 nfs_initialise_sb(sb
);
2220 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2222 const struct nfs_server
*a
= s
->s_fs_info
;
2223 const struct rpc_clnt
*clnt_a
= a
->client
;
2224 const struct rpc_clnt
*clnt_b
= b
->client
;
2226 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2228 if (a
->nfs_client
!= b
->nfs_client
)
2230 if (a
->flags
!= b
->flags
)
2232 if (a
->wsize
!= b
->wsize
)
2234 if (a
->rsize
!= b
->rsize
)
2236 if (a
->acregmin
!= b
->acregmin
)
2238 if (a
->acregmax
!= b
->acregmax
)
2240 if (a
->acdirmin
!= b
->acdirmin
)
2242 if (a
->acdirmax
!= b
->acdirmax
)
2244 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2251 struct nfs_sb_mountdata
{
2252 struct nfs_server
*server
;
2256 static int nfs_set_super(struct super_block
*s
, void *data
)
2258 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2259 struct nfs_server
*server
= sb_mntdata
->server
;
2262 s
->s_flags
= sb_mntdata
->mntflags
;
2263 s
->s_fs_info
= server
;
2264 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2265 ret
= set_anon_super(s
, server
);
2267 server
->s_dev
= s
->s_dev
;
2271 static int nfs_compare_super_address(struct nfs_server
*server1
,
2272 struct nfs_server
*server2
)
2274 struct sockaddr
*sap1
, *sap2
;
2276 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2277 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2279 if (sap1
->sa_family
!= sap2
->sa_family
)
2282 switch (sap1
->sa_family
) {
2284 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2285 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2286 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2288 if (sin1
->sin_port
!= sin2
->sin_port
)
2293 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2294 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2295 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2297 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2308 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2310 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2311 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2312 int mntflags
= sb_mntdata
->mntflags
;
2314 if (!nfs_compare_super_address(old
, server
))
2316 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2317 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2319 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2321 return nfs_compare_mount_options(sb
, server
, mntflags
);
2324 #ifdef CONFIG_NFS_FSCACHE
2325 static void nfs_get_cache_cookie(struct super_block
*sb
,
2326 struct nfs_parsed_mount_data
*parsed
,
2327 struct nfs_clone_mount
*cloned
)
2329 struct nfs_server
*nfss
= NFS_SB(sb
);
2333 nfss
->fscache_key
= NULL
;
2334 nfss
->fscache
= NULL
;
2337 if (!(parsed
->options
& NFS_OPTION_FSCACHE
))
2339 if (parsed
->fscache_uniq
) {
2340 uniq
= parsed
->fscache_uniq
;
2341 ulen
= strlen(parsed
->fscache_uniq
);
2343 } else if (cloned
) {
2344 struct nfs_server
*mnt_s
= NFS_SB(cloned
->sb
);
2345 if (!(mnt_s
->options
& NFS_OPTION_FSCACHE
))
2347 if (mnt_s
->fscache_key
) {
2348 uniq
= mnt_s
->fscache_key
->key
.uniquifier
;
2349 ulen
= mnt_s
->fscache_key
->key
.uniq_len
;
2354 nfs_fscache_get_super_cookie(sb
, uniq
, ulen
);
2357 static void nfs_get_cache_cookie(struct super_block
*sb
,
2358 struct nfs_parsed_mount_data
*parsed
,
2359 struct nfs_clone_mount
*cloned
)
2364 static int nfs_bdi_register(struct nfs_server
*server
)
2366 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2369 int nfs_set_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2370 struct nfs_mount_info
*mount_info
)
2372 return security_sb_set_mnt_opts(s
, &mount_info
->parsed
->lsm_opts
);
2374 EXPORT_SYMBOL_GPL(nfs_set_sb_security
);
2376 int nfs_clone_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2377 struct nfs_mount_info
*mount_info
)
2379 /* clone any lsm security options from the parent to the new sb */
2380 security_sb_clone_mnt_opts(mount_info
->cloned
->sb
, s
);
2381 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
)
2385 EXPORT_SYMBOL_GPL(nfs_clone_sb_security
);
2387 struct dentry
*nfs_fs_mount_common(struct nfs_server
*server
,
2388 int flags
, const char *dev_name
,
2389 struct nfs_mount_info
*mount_info
,
2390 struct nfs_subversion
*nfs_mod
)
2392 struct super_block
*s
;
2393 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2394 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2395 struct nfs_sb_mountdata sb_mntdata
= {
2401 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2402 compare_super
= NULL
;
2404 /* -o noac implies -o sync */
2405 if (server
->flags
& NFS_MOUNT_NOAC
)
2406 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2408 /* Get a superblock - note that we may end up sharing one that already exists */
2409 s
= sget(nfs_mod
->nfs_fs
, compare_super
, nfs_set_super
, flags
, &sb_mntdata
);
2411 mntroot
= ERR_CAST(s
);
2415 if (s
->s_fs_info
!= server
) {
2416 nfs_free_server(server
);
2419 error
= nfs_bdi_register(server
);
2421 mntroot
= ERR_PTR(error
);
2422 goto error_splat_bdi
;
2427 /* initial superblock/root creation */
2428 mount_info
->fill_super(s
, mount_info
);
2429 nfs_get_cache_cookie(s
, mount_info
->parsed
, mount_info
->cloned
);
2432 mntroot
= nfs_get_root(s
, mount_info
->mntfh
, dev_name
);
2433 if (IS_ERR(mntroot
))
2434 goto error_splat_super
;
2436 error
= mount_info
->set_security(s
, mntroot
, mount_info
);
2438 goto error_splat_root
;
2440 s
->s_flags
|= MS_ACTIVE
;
2446 nfs_free_server(server
);
2451 mntroot
= ERR_PTR(error
);
2453 if (server
&& !s
->s_root
)
2454 bdi_unregister(&server
->backing_dev_info
);
2456 deactivate_locked_super(s
);
2459 EXPORT_SYMBOL_GPL(nfs_fs_mount_common
);
2461 struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2462 int flags
, const char *dev_name
, void *raw_data
)
2464 struct nfs_mount_info mount_info
= {
2465 .fill_super
= nfs_fill_super
,
2466 .set_security
= nfs_set_sb_security
,
2468 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2469 struct nfs_subversion
*nfs_mod
;
2472 mount_info
.parsed
= nfs_alloc_parsed_mount_data();
2473 mount_info
.mntfh
= nfs_alloc_fhandle();
2474 if (mount_info
.parsed
== NULL
|| mount_info
.mntfh
== NULL
)
2477 /* Validate the mount data */
2478 error
= nfs_validate_mount_data(fs_type
, raw_data
, mount_info
.parsed
, mount_info
.mntfh
, dev_name
);
2479 if (error
== NFS_TEXT_DATA
)
2480 error
= nfs_validate_text_mount_data(raw_data
, mount_info
.parsed
, dev_name
);
2482 mntroot
= ERR_PTR(error
);
2486 nfs_mod
= get_nfs_version(mount_info
.parsed
->version
);
2487 if (IS_ERR(nfs_mod
)) {
2488 mntroot
= ERR_CAST(nfs_mod
);
2492 mntroot
= nfs_mod
->rpc_ops
->try_mount(flags
, dev_name
, &mount_info
, nfs_mod
);
2494 put_nfs_version(nfs_mod
);
2496 nfs_free_parsed_mount_data(mount_info
.parsed
);
2497 nfs_free_fhandle(mount_info
.mntfh
);
2500 EXPORT_SYMBOL_GPL(nfs_fs_mount
);
2503 * Ensure that we unregister the bdi before kill_anon_super
2504 * releases the device name
2506 void nfs_put_super(struct super_block
*s
)
2508 struct nfs_server
*server
= NFS_SB(s
);
2510 bdi_unregister(&server
->backing_dev_info
);
2512 EXPORT_SYMBOL_GPL(nfs_put_super
);
2515 * Destroy an NFS2/3 superblock
2517 void nfs_kill_super(struct super_block
*s
)
2519 struct nfs_server
*server
= NFS_SB(s
);
2522 nfs_fscache_release_super_cookie(s
);
2523 nfs_free_server(server
);
2525 EXPORT_SYMBOL_GPL(nfs_kill_super
);
2528 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2530 static struct dentry
*
2531 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2532 const char *dev_name
, void *raw_data
)
2534 struct nfs_clone_mount
*data
= raw_data
;
2535 struct nfs_mount_info mount_info
= {
2536 .fill_super
= nfs_clone_super
,
2537 .set_security
= nfs_clone_sb_security
,
2540 struct nfs_server
*server
;
2541 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2542 struct nfs_subversion
*nfs_mod
= NFS_SB(data
->sb
)->nfs_client
->cl_nfs_mod
;
2544 dprintk("--> nfs_xdev_mount()\n");
2546 mount_info
.mntfh
= mount_info
.cloned
->fh
;
2548 /* create a new volume representation */
2549 server
= nfs_mod
->rpc_ops
->clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2552 mntroot
= ERR_CAST(server
);
2554 mntroot
= nfs_fs_mount_common(server
, flags
,
2555 dev_name
, &mount_info
, nfs_mod
);
2557 dprintk("<-- nfs_xdev_mount() = %ld\n",
2558 IS_ERR(mntroot
) ? PTR_ERR(mntroot
) : 0L);
2562 #if IS_ENABLED(CONFIG_NFS_V4)
2564 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2566 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2567 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2571 * Validate NFSv4 mount options
2573 static int nfs4_validate_mount_data(void *options
,
2574 struct nfs_parsed_mount_data
*args
,
2575 const char *dev_name
)
2577 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2578 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2586 switch (data
->version
) {
2588 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2589 goto out_no_address
;
2590 if (data
->host_addrlen
== 0)
2591 goto out_no_address
;
2592 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2593 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2595 if (!nfs_verify_server_address(sap
))
2596 goto out_no_address
;
2597 args
->nfs_server
.port
= ntohs(((struct sockaddr_in
*)sap
)->sin_port
);
2599 if (data
->auth_flavourlen
) {
2600 if (data
->auth_flavourlen
> 1)
2601 goto out_inval_auth
;
2602 if (copy_from_user(&args
->auth_flavors
[0],
2603 data
->auth_flavours
,
2604 sizeof(args
->auth_flavors
[0])))
2608 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2611 args
->nfs_server
.hostname
= c
;
2613 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2616 args
->nfs_server
.export_path
= c
;
2617 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2619 c
= strndup_user(data
->client_addr
.data
, 16);
2622 args
->client_address
= c
;
2625 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2629 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2630 args
->rsize
= data
->rsize
;
2631 args
->wsize
= data
->wsize
;
2632 args
->timeo
= data
->timeo
;
2633 args
->retrans
= data
->retrans
;
2634 args
->acregmin
= data
->acregmin
;
2635 args
->acregmax
= data
->acregmax
;
2636 args
->acdirmin
= data
->acdirmin
;
2637 args
->acdirmax
= data
->acdirmax
;
2638 args
->nfs_server
.protocol
= data
->proto
;
2639 nfs_validate_transport_protocol(args
);
2643 return NFS_TEXT_DATA
;
2649 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2653 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2654 data
->auth_flavourlen
);
2658 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2663 * NFS v4 module parameters need to stay in the
2664 * NFS client for backwards compatibility
2666 unsigned int nfs_callback_set_tcpport
;
2667 unsigned short nfs_callback_tcpport
;
2668 /* Default cache timeout is 10 minutes */
2669 unsigned int nfs_idmap_cache_timeout
= 600;
2670 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2671 bool nfs4_disable_idmapping
= true;
2672 unsigned short max_session_slots
= NFS4_DEF_SLOT_TABLE_SIZE
;
2673 unsigned short send_implementation_id
= 1;
2674 char nfs4_client_id_uniquifier
[NFS4_CLIENT_ID_UNIQ_LEN
] = "";
2676 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport
);
2677 EXPORT_SYMBOL_GPL(nfs_callback_tcpport
);
2678 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout
);
2679 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping
);
2680 EXPORT_SYMBOL_GPL(max_session_slots
);
2681 EXPORT_SYMBOL_GPL(send_implementation_id
);
2682 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier
);
2684 #define NFS_CALLBACK_MAXPORTNR (65535U)
2686 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2693 ret
= kstrtoul(val
, 0, &num
);
2694 if (ret
== -EINVAL
|| num
> NFS_CALLBACK_MAXPORTNR
)
2696 *((unsigned int *)kp
->arg
) = num
;
2699 static struct kernel_param_ops param_ops_portnr
= {
2700 .set
= param_set_portnr
,
2701 .get
= param_get_uint
,
2703 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2705 module_param_named(callback_tcpport
, nfs_callback_set_tcpport
, portnr
, 0644);
2706 module_param(nfs_idmap_cache_timeout
, int, 0644);
2707 module_param(nfs4_disable_idmapping
, bool, 0644);
2708 module_param_string(nfs4_unique_id
, nfs4_client_id_uniquifier
,
2709 NFS4_CLIENT_ID_UNIQ_LEN
, 0600);
2710 MODULE_PARM_DESC(nfs4_disable_idmapping
,
2711 "Turn off NFSv4 idmapping when using 'sec=sys'");
2712 module_param(max_session_slots
, ushort
, 0644);
2713 MODULE_PARM_DESC(max_session_slots
, "Maximum number of outstanding NFSv4.1 "
2714 "requests the client will negotiate");
2715 module_param(send_implementation_id
, ushort
, 0644);
2716 MODULE_PARM_DESC(send_implementation_id
,
2717 "Send implementation ID with NFSv4.1 exchange_id");
2718 MODULE_PARM_DESC(nfs4_unique_id
, "nfs_client_id4 uniquifier string");
2719 MODULE_ALIAS("nfs4");
2721 #endif /* CONFIG_NFS_V4 */