4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/addr.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/sunrpc/xprtsock.h>
38 #include <linux/sunrpc/xprtrdma.h>
39 #include <linux/nfs_fs.h>
40 #include <linux/nfs_mount.h>
41 #include <linux/nfs4_mount.h>
42 #include <linux/lockd/bind.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
56 #include <linux/nsproxy.h>
57 #include <linux/rcupdate.h>
59 #include <asm/uaccess.h>
63 #include "delegation.h"
67 #include "nfs4session.h"
71 #define NFSDBG_FACILITY NFSDBG_VFS
72 #define NFS_TEXT_DATA 1
74 #if IS_ENABLED(CONFIG_NFS_V3)
75 #define NFS_DEFAULT_VERSION 3
77 #define NFS_DEFAULT_VERSION 2
81 /* Mount options that take no arguments */
83 Opt_posix
, Opt_noposix
,
87 Opt_udp
, Opt_tcp
, Opt_rdma
,
89 Opt_rdirplus
, Opt_nordirplus
,
90 Opt_sharecache
, Opt_nosharecache
,
91 Opt_resvport
, Opt_noresvport
,
92 Opt_fscache
, Opt_nofscache
,
93 Opt_migration
, Opt_nomigration
,
95 /* Mount options that take integer arguments */
97 Opt_rsize
, Opt_wsize
, Opt_bsize
,
98 Opt_timeo
, Opt_retrans
,
99 Opt_acregmin
, Opt_acregmax
,
100 Opt_acdirmin
, Opt_acdirmax
,
107 /* Mount options that take string arguments */
109 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
110 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
115 /* Special mount options */
116 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
121 static const match_table_t nfs_mount_option_tokens
= {
122 { Opt_userspace
, "bg" },
123 { Opt_userspace
, "fg" },
124 { Opt_userspace
, "retry=%s" },
126 { Opt_sloppy
, "sloppy" },
128 { Opt_soft
, "soft" },
129 { Opt_hard
, "hard" },
130 { Opt_deprecated
, "intr" },
131 { Opt_deprecated
, "nointr" },
132 { Opt_posix
, "posix" },
133 { Opt_noposix
, "noposix" },
135 { Opt_nocto
, "nocto" },
137 { Opt_noac
, "noac" },
138 { Opt_lock
, "lock" },
139 { Opt_nolock
, "nolock" },
142 { Opt_rdma
, "rdma" },
144 { Opt_noacl
, "noacl" },
145 { Opt_rdirplus
, "rdirplus" },
146 { Opt_nordirplus
, "nordirplus" },
147 { Opt_sharecache
, "sharecache" },
148 { Opt_nosharecache
, "nosharecache" },
149 { Opt_resvport
, "resvport" },
150 { Opt_noresvport
, "noresvport" },
151 { Opt_fscache
, "fsc" },
152 { Opt_nofscache
, "nofsc" },
153 { Opt_migration
, "migration" },
154 { Opt_nomigration
, "nomigration" },
156 { Opt_port
, "port=%s" },
157 { Opt_rsize
, "rsize=%s" },
158 { Opt_wsize
, "wsize=%s" },
159 { Opt_bsize
, "bsize=%s" },
160 { Opt_timeo
, "timeo=%s" },
161 { Opt_retrans
, "retrans=%s" },
162 { Opt_acregmin
, "acregmin=%s" },
163 { Opt_acregmax
, "acregmax=%s" },
164 { Opt_acdirmin
, "acdirmin=%s" },
165 { Opt_acdirmax
, "acdirmax=%s" },
166 { Opt_actimeo
, "actimeo=%s" },
167 { Opt_namelen
, "namlen=%s" },
168 { Opt_mountport
, "mountport=%s" },
169 { Opt_mountvers
, "mountvers=%s" },
170 { Opt_minorversion
, "minorversion=%s" },
172 { Opt_nfsvers
, "nfsvers=%s" },
173 { Opt_nfsvers
, "vers=%s" },
175 { Opt_sec
, "sec=%s" },
176 { Opt_proto
, "proto=%s" },
177 { Opt_mountproto
, "mountproto=%s" },
178 { Opt_addr
, "addr=%s" },
179 { Opt_clientaddr
, "clientaddr=%s" },
180 { Opt_mounthost
, "mounthost=%s" },
181 { Opt_mountaddr
, "mountaddr=%s" },
183 { Opt_lookupcache
, "lookupcache=%s" },
184 { Opt_fscache_uniq
, "fsc=%s" },
185 { Opt_local_lock
, "local_lock=%s" },
187 /* The following needs to be listed after all other options */
188 { Opt_nfsvers
, "v%s" },
194 Opt_xprt_udp
, Opt_xprt_udp6
, Opt_xprt_tcp
, Opt_xprt_tcp6
, Opt_xprt_rdma
,
199 static const match_table_t nfs_xprt_protocol_tokens
= {
200 { Opt_xprt_udp
, "udp" },
201 { Opt_xprt_udp6
, "udp6" },
202 { Opt_xprt_tcp
, "tcp" },
203 { Opt_xprt_tcp6
, "tcp6" },
204 { Opt_xprt_rdma
, "rdma" },
206 { Opt_xprt_err
, NULL
}
210 Opt_sec_none
, Opt_sec_sys
,
211 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
212 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
213 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
218 static const match_table_t nfs_secflavor_tokens
= {
219 { Opt_sec_none
, "none" },
220 { Opt_sec_none
, "null" },
221 { Opt_sec_sys
, "sys" },
223 { Opt_sec_krb5
, "krb5" },
224 { Opt_sec_krb5i
, "krb5i" },
225 { Opt_sec_krb5p
, "krb5p" },
227 { Opt_sec_lkey
, "lkey" },
228 { Opt_sec_lkeyi
, "lkeyi" },
229 { Opt_sec_lkeyp
, "lkeyp" },
231 { Opt_sec_spkm
, "spkm3" },
232 { Opt_sec_spkmi
, "spkm3i" },
233 { Opt_sec_spkmp
, "spkm3p" },
235 { Opt_sec_err
, NULL
}
239 Opt_lookupcache_all
, Opt_lookupcache_positive
,
240 Opt_lookupcache_none
,
245 static match_table_t nfs_lookupcache_tokens
= {
246 { Opt_lookupcache_all
, "all" },
247 { Opt_lookupcache_positive
, "pos" },
248 { Opt_lookupcache_positive
, "positive" },
249 { Opt_lookupcache_none
, "none" },
251 { Opt_lookupcache_err
, NULL
}
255 Opt_local_lock_all
, Opt_local_lock_flock
, Opt_local_lock_posix
,
261 static match_table_t nfs_local_lock_tokens
= {
262 { Opt_local_lock_all
, "all" },
263 { Opt_local_lock_flock
, "flock" },
264 { Opt_local_lock_posix
, "posix" },
265 { Opt_local_lock_none
, "none" },
267 { Opt_local_lock_err
, NULL
}
271 Opt_vers_2
, Opt_vers_3
, Opt_vers_4
, Opt_vers_4_0
,
277 static match_table_t nfs_vers_tokens
= {
281 { Opt_vers_4_0
, "4.0" },
282 { Opt_vers_4_1
, "4.1" },
284 { Opt_vers_err
, NULL
}
287 static struct dentry
*nfs_xdev_mount(struct file_system_type
*fs_type
,
288 int flags
, const char *dev_name
, void *raw_data
);
290 struct file_system_type nfs_fs_type
= {
291 .owner
= THIS_MODULE
,
293 .mount
= nfs_fs_mount
,
294 .kill_sb
= nfs_kill_super
,
295 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_BINARY_MOUNTDATA
,
297 EXPORT_SYMBOL_GPL(nfs_fs_type
);
299 struct file_system_type nfs_xdev_fs_type
= {
300 .owner
= THIS_MODULE
,
302 .mount
= nfs_xdev_mount
,
303 .kill_sb
= nfs_kill_super
,
304 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_BINARY_MOUNTDATA
,
307 const struct super_operations nfs_sops
= {
308 .alloc_inode
= nfs_alloc_inode
,
309 .destroy_inode
= nfs_destroy_inode
,
310 .write_inode
= nfs_write_inode
,
311 .drop_inode
= nfs_drop_inode
,
312 .put_super
= nfs_put_super
,
313 .statfs
= nfs_statfs
,
314 .evict_inode
= nfs_evict_inode
,
315 .umount_begin
= nfs_umount_begin
,
316 .show_options
= nfs_show_options
,
317 .show_devname
= nfs_show_devname
,
318 .show_path
= nfs_show_path
,
319 .show_stats
= nfs_show_stats
,
320 .remount_fs
= nfs_remount
,
322 EXPORT_SYMBOL_GPL(nfs_sops
);
324 #if IS_ENABLED(CONFIG_NFS_V4)
325 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*);
326 static int nfs4_validate_mount_data(void *options
,
327 struct nfs_parsed_mount_data
*args
, const char *dev_name
);
329 struct file_system_type nfs4_fs_type
= {
330 .owner
= THIS_MODULE
,
332 .mount
= nfs_fs_mount
,
333 .kill_sb
= nfs_kill_super
,
334 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_BINARY_MOUNTDATA
,
336 EXPORT_SYMBOL_GPL(nfs4_fs_type
);
338 static int __init
register_nfs4_fs(void)
340 return register_filesystem(&nfs4_fs_type
);
343 static void unregister_nfs4_fs(void)
345 unregister_filesystem(&nfs4_fs_type
);
348 static int __init
register_nfs4_fs(void)
353 static void unregister_nfs4_fs(void)
358 static struct shrinker acl_shrinker
= {
359 .shrink
= nfs_access_cache_shrinker
,
360 .seeks
= DEFAULT_SEEKS
,
364 * Register the NFS filesystems
366 int __init
register_nfs_fs(void)
370 ret
= register_filesystem(&nfs_fs_type
);
374 ret
= register_nfs4_fs();
378 ret
= nfs_register_sysctl();
381 register_shrinker(&acl_shrinker
);
385 unregister_nfs4_fs();
387 unregister_filesystem(&nfs_fs_type
);
393 * Unregister the NFS filesystems
395 void __exit
unregister_nfs_fs(void)
397 unregister_shrinker(&acl_shrinker
);
398 nfs_unregister_sysctl();
399 unregister_nfs4_fs();
400 unregister_filesystem(&nfs_fs_type
);
403 void nfs_sb_active(struct super_block
*sb
)
405 struct nfs_server
*server
= NFS_SB(sb
);
407 if (atomic_inc_return(&server
->active
) == 1)
408 atomic_inc(&sb
->s_active
);
410 EXPORT_SYMBOL_GPL(nfs_sb_active
);
412 void nfs_sb_deactive(struct super_block
*sb
)
414 struct nfs_server
*server
= NFS_SB(sb
);
416 if (atomic_dec_and_test(&server
->active
))
417 deactivate_super(sb
);
419 EXPORT_SYMBOL_GPL(nfs_sb_deactive
);
422 * Deliver file system statistics to userspace
424 int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
426 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
427 unsigned char blockbits
;
428 unsigned long blockres
;
429 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
430 struct nfs_fsstat res
;
433 res
.fattr
= nfs_alloc_fattr();
434 if (res
.fattr
== NULL
)
437 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
438 if (unlikely(error
== -ESTALE
)) {
439 struct dentry
*pd_dentry
;
441 pd_dentry
= dget_parent(dentry
);
442 if (pd_dentry
!= NULL
) {
443 nfs_zap_caches(pd_dentry
->d_inode
);
447 nfs_free_fattr(res
.fattr
);
451 buf
->f_type
= NFS_SUPER_MAGIC
;
454 * Current versions of glibc do not correctly handle the
455 * case where f_frsize != f_bsize. Eventually we want to
456 * report the value of wtmult in this field.
458 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
461 * On most *nix systems, f_blocks, f_bfree, and f_bavail
462 * are reported in units of f_frsize. Linux hasn't had
463 * an f_frsize field in its statfs struct until recently,
464 * thus historically Linux's sys_statfs reports these
465 * fields in units of f_bsize.
467 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
468 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
469 blockres
= (1 << blockbits
) - 1;
470 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
471 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
472 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
474 buf
->f_files
= res
.tfiles
;
475 buf
->f_ffree
= res
.afiles
;
477 buf
->f_namelen
= server
->namelen
;
482 dprintk("%s: statfs error = %d\n", __func__
, -error
);
485 EXPORT_SYMBOL_GPL(nfs_statfs
);
488 * Map the security flavour number to a name
490 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
492 static const struct {
493 rpc_authflavor_t flavour
;
496 { RPC_AUTH_NULL
, "null" },
497 { RPC_AUTH_UNIX
, "sys" },
498 { RPC_AUTH_GSS_KRB5
, "krb5" },
499 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
500 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
501 { RPC_AUTH_GSS_LKEY
, "lkey" },
502 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
503 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
504 { RPC_AUTH_GSS_SPKM
, "spkm" },
505 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
506 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
507 { UINT_MAX
, "unknown" }
511 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
512 if (sec_flavours
[i
].flavour
== flavour
)
515 return sec_flavours
[i
].str
;
518 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
521 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
523 seq_printf(m
, ",mountproto=");
524 switch (sap
->sa_family
) {
526 switch (nfss
->mountd_protocol
) {
528 seq_printf(m
, RPCBIND_NETID_UDP
);
531 seq_printf(m
, RPCBIND_NETID_TCP
);
535 seq_printf(m
, "auto");
539 switch (nfss
->mountd_protocol
) {
541 seq_printf(m
, RPCBIND_NETID_UDP6
);
544 seq_printf(m
, RPCBIND_NETID_TCP6
);
548 seq_printf(m
, "auto");
553 seq_printf(m
, "auto");
557 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
560 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
562 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
565 switch (sap
->sa_family
) {
567 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
568 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
572 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
573 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
578 seq_printf(m
, ",mountaddr=unspecified");
581 if (nfss
->mountd_version
|| showdefaults
)
582 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
583 if ((nfss
->mountd_port
&&
584 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
586 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
588 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
591 #if IS_ENABLED(CONFIG_NFS_V4)
592 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
595 struct nfs_client
*clp
= nfss
->nfs_client
;
597 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
600 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
606 static void nfs_show_nfs_version(struct seq_file
*m
,
607 unsigned int version
,
608 unsigned int minorversion
)
610 seq_printf(m
, ",vers=%u", version
);
612 seq_printf(m
, ".%u", minorversion
);
616 * Describe the mount options in force on this server representation
618 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
621 static const struct proc_nfs_info
{
626 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
627 { NFS_MOUNT_POSIX
, ",posix", "" },
628 { NFS_MOUNT_NOCTO
, ",nocto", "" },
629 { NFS_MOUNT_NOAC
, ",noac", "" },
630 { NFS_MOUNT_NONLM
, ",nolock", "" },
631 { NFS_MOUNT_NOACL
, ",noacl", "" },
632 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
633 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
634 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
637 const struct proc_nfs_info
*nfs_infop
;
638 struct nfs_client
*clp
= nfss
->nfs_client
;
639 u32 version
= clp
->rpc_ops
->version
;
640 int local_flock
, local_fcntl
;
642 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
643 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
644 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
645 if (nfss
->bsize
!= 0)
646 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
647 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
648 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
649 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
650 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
651 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
652 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
653 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
654 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
655 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
656 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
657 if (nfss
->flags
& nfs_infop
->flag
)
658 seq_puts(m
, nfs_infop
->str
);
660 seq_puts(m
, nfs_infop
->nostr
);
663 seq_printf(m
, ",proto=%s",
664 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
667 if (nfss
->port
!= NFS_PORT
)
668 seq_printf(m
, ",port=%u", nfss
->port
);
671 seq_printf(m
, ",port=%u", nfss
->port
);
673 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
674 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
675 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
678 nfs_show_mountd_options(m
, nfss
, showdefaults
);
680 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
682 if (nfss
->options
& NFS_OPTION_FSCACHE
)
683 seq_printf(m
, ",fsc");
685 if (nfss
->options
& NFS_OPTION_MIGRATION
)
686 seq_printf(m
, ",migration");
688 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
689 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
690 seq_printf(m
, ",lookupcache=none");
692 seq_printf(m
, ",lookupcache=pos");
695 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
696 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
698 if (!local_flock
&& !local_fcntl
)
699 seq_printf(m
, ",local_lock=none");
700 else if (local_flock
&& local_fcntl
)
701 seq_printf(m
, ",local_lock=all");
702 else if (local_flock
)
703 seq_printf(m
, ",local_lock=flock");
705 seq_printf(m
, ",local_lock=posix");
709 * Describe the mount options on this VFS mountpoint
711 int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
713 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
715 nfs_show_mount_options(m
, nfss
, 0);
718 seq_printf(m
, ",addr=%s",
719 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
725 EXPORT_SYMBOL_GPL(nfs_show_options
);
727 #if IS_ENABLED(CONFIG_NFS_V4)
728 #ifdef CONFIG_NFS_V4_1
729 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
731 if (nfs4_has_session(server
->nfs_client
))
732 seq_printf(m
, ",sessions");
735 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
739 #ifdef CONFIG_NFS_V4_1
740 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
742 seq_printf(m
, ",pnfs=");
743 if (server
->pnfs_curr_ld
)
744 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
746 seq_printf(m
, "not configured");
749 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
751 if (nfss
->nfs_client
&& nfss
->nfs_client
->cl_implid
) {
752 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->cl_implid
;
753 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
755 impl_id
->name
, impl_id
->domain
,
756 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
760 #if IS_ENABLED(CONFIG_NFS_V4)
761 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
765 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
770 int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
772 char *page
= (char *) __get_free_page(GFP_KERNEL
);
773 char *devname
, *dummy
;
777 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
, 0);
779 err
= PTR_ERR(devname
);
781 seq_escape(m
, devname
, " \t\n\\");
782 free_page((unsigned long)page
);
785 EXPORT_SYMBOL_GPL(nfs_show_devname
);
787 int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
792 EXPORT_SYMBOL_GPL(nfs_show_path
);
795 * Present statistical information for this VFS mountpoint
797 int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
800 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
801 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
802 struct nfs_iostats totals
= { };
804 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
807 * Display all mount option settings
809 seq_printf(m
, "\n\topts:\t");
810 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
811 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
812 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
813 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
814 nfs_show_mount_options(m
, nfss
, 1);
816 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
818 show_implementation_id(m
, nfss
);
820 seq_printf(m
, "\n\tcaps:\t");
821 seq_printf(m
, "caps=0x%x", nfss
->caps
);
822 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
823 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
824 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
825 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
827 #if IS_ENABLED(CONFIG_NFS_V4)
828 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
829 seq_printf(m
, "\n\tnfsv4:\t");
830 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
831 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
832 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
833 show_sessions(m
, nfss
);
839 * Display security flavor in effect for this mount
841 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
843 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
846 * Display superblock I/O counters
848 for_each_possible_cpu(cpu
) {
849 struct nfs_iostats
*stats
;
852 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
854 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
855 totals
.events
[i
] += stats
->events
[i
];
856 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
857 totals
.bytes
[i
] += stats
->bytes
[i
];
858 #ifdef CONFIG_NFS_FSCACHE
859 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
860 totals
.fscache
[i
] += stats
->fscache
[i
];
866 seq_printf(m
, "\n\tevents:\t");
867 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
868 seq_printf(m
, "%lu ", totals
.events
[i
]);
869 seq_printf(m
, "\n\tbytes:\t");
870 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
871 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
872 #ifdef CONFIG_NFS_FSCACHE
873 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
874 seq_printf(m
, "\n\tfsc:\t");
875 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
876 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
881 rpc_print_iostats(m
, nfss
->client
);
885 EXPORT_SYMBOL_GPL(nfs_show_stats
);
888 * Begin unmount by attempting to remove all automounted mountpoints we added
889 * in response to xdev traversals and referrals
891 void nfs_umount_begin(struct super_block
*sb
)
893 struct nfs_server
*server
;
894 struct rpc_clnt
*rpc
;
897 /* -EIO all pending I/O */
898 rpc
= server
->client_acl
;
900 rpc_killall_tasks(rpc
);
901 rpc
= server
->client
;
903 rpc_killall_tasks(rpc
);
905 EXPORT_SYMBOL_GPL(nfs_umount_begin
);
907 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(void)
909 struct nfs_parsed_mount_data
*data
;
911 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
913 data
->acregmin
= NFS_DEF_ACREGMIN
;
914 data
->acregmax
= NFS_DEF_ACREGMAX
;
915 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
916 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
917 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
918 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
919 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
920 data
->auth_flavors
[0] = RPC_AUTH_UNIX
;
921 data
->auth_flavor_len
= 1;
922 data
->minorversion
= 0;
923 data
->need_mount
= true;
924 data
->net
= current
->nsproxy
->net_ns
;
925 security_init_mnt_opts(&data
->lsm_opts
);
930 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data
*data
)
933 kfree(data
->client_address
);
934 kfree(data
->mount_server
.hostname
);
935 kfree(data
->nfs_server
.export_path
);
936 kfree(data
->nfs_server
.hostname
);
937 kfree(data
->fscache_uniq
);
938 security_free_mnt_opts(&data
->lsm_opts
);
944 * Sanity-check a server address provided by the mount command.
946 * Address family must be initialized, and address must not be
947 * the ANY address for that family.
949 static int nfs_verify_server_address(struct sockaddr
*addr
)
951 switch (addr
->sa_family
) {
953 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
954 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
957 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
958 return !ipv6_addr_any(sa
);
962 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
967 * Select between a default port value and a user-specified port value.
968 * If a zero value is set, then autobind will be used.
970 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
971 const unsigned short default_port
)
973 if (*port
== NFS_UNSPEC_PORT
)
974 *port
= default_port
;
976 rpc_set_port(sap
, *port
);
980 * Sanity check the NFS transport protocol.
983 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
985 switch (mnt
->nfs_server
.protocol
) {
986 case XPRT_TRANSPORT_UDP
:
987 case XPRT_TRANSPORT_TCP
:
988 case XPRT_TRANSPORT_RDMA
:
991 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
996 * For text based NFSv2/v3 mounts, the mount protocol transport default
997 * settings should depend upon the specified NFS transport.
999 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
1001 nfs_validate_transport_protocol(mnt
);
1003 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
1004 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
1006 switch (mnt
->nfs_server
.protocol
) {
1007 case XPRT_TRANSPORT_UDP
:
1008 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1010 case XPRT_TRANSPORT_TCP
:
1011 case XPRT_TRANSPORT_RDMA
:
1012 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1017 * Parse the value of the 'sec=' option.
1019 static int nfs_parse_security_flavors(char *value
,
1020 struct nfs_parsed_mount_data
*mnt
)
1022 substring_t args
[MAX_OPT_ARGS
];
1024 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1026 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
1028 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
1031 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1034 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
1037 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
1040 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
1043 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
1046 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
1049 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1052 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1055 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1058 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1064 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1065 mnt
->auth_flavor_len
= 1;
1069 static int nfs_parse_version_string(char *string
,
1070 struct nfs_parsed_mount_data
*mnt
,
1073 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1074 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1079 mnt
->flags
|= NFS_MOUNT_VER3
;
1083 /* Backward compatibility option. In future,
1084 * the mount program should always supply
1085 * a NFSv4 minor version number.
1091 mnt
->minorversion
= 0;
1095 mnt
->minorversion
= 1;
1103 static int nfs_get_option_str(substring_t args
[], char **option
)
1106 *option
= match_strdup(args
);
1110 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1115 string
= match_strdup(args
);
1118 rc
= kstrtoul(string
, 10, option
);
1125 * Error-check and convert a string of mount options from user space into
1126 * a data structure. The whole mount string is processed; bad options are
1127 * skipped as they are encountered. If there were no errors, return 1;
1128 * otherwise return 0 (zero).
1130 static int nfs_parse_mount_options(char *raw
,
1131 struct nfs_parsed_mount_data
*mnt
)
1133 char *p
, *string
, *secdata
;
1134 int rc
, sloppy
= 0, invalid_option
= 0;
1135 unsigned short protofamily
= AF_UNSPEC
;
1136 unsigned short mountfamily
= AF_UNSPEC
;
1139 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1142 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1144 secdata
= alloc_secdata();
1148 rc
= security_sb_copy_data(raw
, secdata
);
1150 goto out_security_failure
;
1152 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1154 goto out_security_failure
;
1156 free_secdata(secdata
);
1158 while ((p
= strsep(&raw
, ",")) != NULL
) {
1159 substring_t args
[MAX_OPT_ARGS
];
1160 unsigned long option
;
1166 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1168 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1172 * boolean options: foo/nofoo
1175 mnt
->flags
|= NFS_MOUNT_SOFT
;
1178 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1181 mnt
->flags
|= NFS_MOUNT_POSIX
;
1184 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1187 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1190 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1193 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1196 mnt
->flags
|= NFS_MOUNT_NOAC
;
1199 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1200 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1201 NFS_MOUNT_LOCAL_FCNTL
);
1204 mnt
->flags
|= NFS_MOUNT_NONLM
;
1205 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1206 NFS_MOUNT_LOCAL_FCNTL
);
1209 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1210 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1213 mnt
->flags
|= NFS_MOUNT_TCP
;
1214 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1217 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1218 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1219 xprt_load_transport(p
);
1222 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1225 mnt
->flags
|= NFS_MOUNT_NOACL
;
1228 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1230 case Opt_nordirplus
:
1231 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1233 case Opt_sharecache
:
1234 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1236 case Opt_nosharecache
:
1237 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1240 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1242 case Opt_noresvport
:
1243 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1246 mnt
->options
|= NFS_OPTION_FSCACHE
;
1247 kfree(mnt
->fscache_uniq
);
1248 mnt
->fscache_uniq
= NULL
;
1251 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1252 kfree(mnt
->fscache_uniq
);
1253 mnt
->fscache_uniq
= NULL
;
1256 mnt
->options
|= NFS_OPTION_MIGRATION
;
1258 case Opt_nomigration
:
1259 mnt
->options
&= NFS_OPTION_MIGRATION
;
1263 * options that take numeric values
1266 if (nfs_get_option_ul(args
, &option
) ||
1268 goto out_invalid_value
;
1269 mnt
->nfs_server
.port
= option
;
1272 if (nfs_get_option_ul(args
, &option
))
1273 goto out_invalid_value
;
1274 mnt
->rsize
= option
;
1277 if (nfs_get_option_ul(args
, &option
))
1278 goto out_invalid_value
;
1279 mnt
->wsize
= option
;
1282 if (nfs_get_option_ul(args
, &option
))
1283 goto out_invalid_value
;
1284 mnt
->bsize
= option
;
1287 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1288 goto out_invalid_value
;
1289 mnt
->timeo
= option
;
1292 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1293 goto out_invalid_value
;
1294 mnt
->retrans
= option
;
1297 if (nfs_get_option_ul(args
, &option
))
1298 goto out_invalid_value
;
1299 mnt
->acregmin
= option
;
1302 if (nfs_get_option_ul(args
, &option
))
1303 goto out_invalid_value
;
1304 mnt
->acregmax
= option
;
1307 if (nfs_get_option_ul(args
, &option
))
1308 goto out_invalid_value
;
1309 mnt
->acdirmin
= option
;
1312 if (nfs_get_option_ul(args
, &option
))
1313 goto out_invalid_value
;
1314 mnt
->acdirmax
= option
;
1317 if (nfs_get_option_ul(args
, &option
))
1318 goto out_invalid_value
;
1319 mnt
->acregmin
= mnt
->acregmax
=
1320 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1323 if (nfs_get_option_ul(args
, &option
))
1324 goto out_invalid_value
;
1325 mnt
->namlen
= option
;
1328 if (nfs_get_option_ul(args
, &option
) ||
1330 goto out_invalid_value
;
1331 mnt
->mount_server
.port
= option
;
1334 if (nfs_get_option_ul(args
, &option
) ||
1335 option
< NFS_MNT_VERSION
||
1336 option
> NFS_MNT3_VERSION
)
1337 goto out_invalid_value
;
1338 mnt
->mount_server
.version
= option
;
1340 case Opt_minorversion
:
1341 if (nfs_get_option_ul(args
, &option
))
1342 goto out_invalid_value
;
1343 if (option
> NFS4_MAX_MINOR_VERSION
)
1344 goto out_invalid_value
;
1345 mnt
->minorversion
= option
;
1349 * options that take text values
1352 string
= match_strdup(args
);
1355 rc
= nfs_parse_version_string(string
, mnt
, args
);
1358 goto out_invalid_value
;
1361 string
= match_strdup(args
);
1364 rc
= nfs_parse_security_flavors(string
, mnt
);
1367 dfprintk(MOUNT
, "NFS: unrecognized "
1368 "security flavor\n");
1373 string
= match_strdup(args
);
1376 token
= match_token(string
,
1377 nfs_xprt_protocol_tokens
, args
);
1379 protofamily
= AF_INET
;
1382 protofamily
= AF_INET6
;
1384 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1385 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1388 protofamily
= AF_INET6
;
1390 mnt
->flags
|= NFS_MOUNT_TCP
;
1391 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1394 /* vector side protocols to TCP */
1395 mnt
->flags
|= NFS_MOUNT_TCP
;
1396 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1397 xprt_load_transport(string
);
1400 dfprintk(MOUNT
, "NFS: unrecognized "
1401 "transport protocol\n");
1407 case Opt_mountproto
:
1408 string
= match_strdup(args
);
1411 token
= match_token(string
,
1412 nfs_xprt_protocol_tokens
, args
);
1415 mountfamily
= AF_INET
;
1418 mountfamily
= AF_INET6
;
1420 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1423 mountfamily
= AF_INET6
;
1425 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1427 case Opt_xprt_rdma
: /* not used for side protocols */
1429 dfprintk(MOUNT
, "NFS: unrecognized "
1430 "transport protocol\n");
1435 string
= match_strdup(args
);
1438 mnt
->nfs_server
.addrlen
=
1439 rpc_pton(mnt
->net
, string
, strlen(string
),
1441 &mnt
->nfs_server
.address
,
1442 sizeof(mnt
->nfs_server
.address
));
1444 if (mnt
->nfs_server
.addrlen
== 0)
1445 goto out_invalid_address
;
1447 case Opt_clientaddr
:
1448 if (nfs_get_option_str(args
, &mnt
->client_address
))
1452 if (nfs_get_option_str(args
,
1453 &mnt
->mount_server
.hostname
))
1457 string
= match_strdup(args
);
1460 mnt
->mount_server
.addrlen
=
1461 rpc_pton(mnt
->net
, string
, strlen(string
),
1463 &mnt
->mount_server
.address
,
1464 sizeof(mnt
->mount_server
.address
));
1466 if (mnt
->mount_server
.addrlen
== 0)
1467 goto out_invalid_address
;
1469 case Opt_lookupcache
:
1470 string
= match_strdup(args
);
1473 token
= match_token(string
,
1474 nfs_lookupcache_tokens
, args
);
1477 case Opt_lookupcache_all
:
1478 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1480 case Opt_lookupcache_positive
:
1481 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1482 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1484 case Opt_lookupcache_none
:
1485 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1488 dfprintk(MOUNT
, "NFS: invalid "
1489 "lookupcache argument\n");
1493 case Opt_fscache_uniq
:
1494 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1496 mnt
->options
|= NFS_OPTION_FSCACHE
;
1498 case Opt_local_lock
:
1499 string
= match_strdup(args
);
1502 token
= match_token(string
, nfs_local_lock_tokens
,
1506 case Opt_local_lock_all
:
1507 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1508 NFS_MOUNT_LOCAL_FCNTL
);
1510 case Opt_local_lock_flock
:
1511 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1513 case Opt_local_lock_posix
:
1514 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1516 case Opt_local_lock_none
:
1517 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1518 NFS_MOUNT_LOCAL_FCNTL
);
1521 dfprintk(MOUNT
, "NFS: invalid "
1522 "local_lock argument\n");
1532 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1535 case Opt_deprecated
:
1536 dfprintk(MOUNT
, "NFS: ignoring mount option "
1542 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1547 if (!sloppy
&& invalid_option
)
1550 if (mnt
->minorversion
&& mnt
->version
!= 4)
1551 goto out_minorversion_mismatch
;
1553 if (mnt
->options
& NFS_OPTION_MIGRATION
&&
1554 mnt
->version
!= 4 && mnt
->minorversion
!= 0)
1555 goto out_migration_misuse
;
1558 * verify that any proto=/mountproto= options match the address
1559 * families in the addr=/mountaddr= options.
1561 if (protofamily
!= AF_UNSPEC
&&
1562 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1563 goto out_proto_mismatch
;
1565 if (mountfamily
!= AF_UNSPEC
) {
1566 if (mnt
->mount_server
.addrlen
) {
1567 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1568 goto out_mountproto_mismatch
;
1570 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1571 goto out_mountproto_mismatch
;
1577 out_mountproto_mismatch
:
1578 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1582 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1584 out_invalid_address
:
1585 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1588 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1590 out_minorversion_mismatch
:
1591 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1592 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1594 out_migration_misuse
:
1596 "NFS: 'migration' not supported for this NFS version\n");
1599 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1601 out_security_failure
:
1602 free_secdata(secdata
);
1603 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1608 * Match the requested auth flavors with the list returned by
1609 * the server. Returns zero and sets the mount's authentication
1610 * flavor on success; returns -EACCES if server does not support
1611 * the requested flavor.
1613 static int nfs_walk_authlist(struct nfs_parsed_mount_data
*args
,
1614 struct nfs_mount_request
*request
)
1616 unsigned int i
, j
, server_authlist_len
= *(request
->auth_flav_len
);
1619 * Certain releases of Linux's mountd return an empty
1620 * flavor list. To prevent behavioral regression with
1621 * these servers (ie. rejecting mounts that used to
1622 * succeed), revert to pre-2.6.32 behavior (no checking)
1623 * if the returned flavor list is empty.
1625 if (server_authlist_len
== 0)
1629 * We avoid sophisticated negotiating here, as there are
1630 * plenty of cases where we can get it wrong, providing
1631 * either too little or too much security.
1633 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1634 * flavor listed first. However, some servers list
1635 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1636 * preferred default, in args->auth_flavors[0] if user
1637 * didn't specify sec= mount option.
1639 for (i
= 0; i
< args
->auth_flavor_len
; i
++)
1640 for (j
= 0; j
< server_authlist_len
; j
++)
1641 if (args
->auth_flavors
[i
] == request
->auth_flavs
[j
]) {
1642 dfprintk(MOUNT
, "NFS: using auth flavor %d\n",
1643 request
->auth_flavs
[j
]);
1644 args
->auth_flavors
[0] = request
->auth_flavs
[j
];
1648 dfprintk(MOUNT
, "NFS: server does not support requested auth flavor\n");
1649 nfs_umount(request
);
1654 * Use the remote server's MOUNT service to request the NFS file handle
1655 * corresponding to the provided path.
1657 static int nfs_request_mount(struct nfs_parsed_mount_data
*args
,
1658 struct nfs_fh
*root_fh
)
1660 rpc_authflavor_t server_authlist
[NFS_MAX_SECFLAVORS
];
1661 unsigned int server_authlist_len
= ARRAY_SIZE(server_authlist
);
1662 struct nfs_mount_request request
= {
1663 .sap
= (struct sockaddr
*)
1664 &args
->mount_server
.address
,
1665 .dirpath
= args
->nfs_server
.export_path
,
1666 .protocol
= args
->mount_server
.protocol
,
1668 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1669 .auth_flav_len
= &server_authlist_len
,
1670 .auth_flavs
= server_authlist
,
1675 if (args
->mount_server
.version
== 0) {
1676 switch (args
->version
) {
1678 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1681 args
->mount_server
.version
= NFS_MNT_VERSION
;
1684 request
.version
= args
->mount_server
.version
;
1686 if (args
->mount_server
.hostname
)
1687 request
.hostname
= args
->mount_server
.hostname
;
1689 request
.hostname
= args
->nfs_server
.hostname
;
1692 * Construct the mount server's address.
1694 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1695 memcpy(request
.sap
, &args
->nfs_server
.address
,
1696 args
->nfs_server
.addrlen
);
1697 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1699 request
.salen
= args
->mount_server
.addrlen
;
1700 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1703 * Now ask the mount server to map our export path
1706 status
= nfs_mount(&request
);
1708 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1709 request
.hostname
, status
);
1714 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1716 if (args
->mount_server
.version
!= NFS_MNT3_VERSION
)
1718 return nfs_walk_authlist(args
, &request
);
1721 struct dentry
*nfs_try_mount(int flags
, const char *dev_name
,
1722 struct nfs_mount_info
*mount_info
,
1723 struct nfs_subversion
*nfs_mod
)
1726 struct nfs_server
*server
;
1728 if (mount_info
->parsed
->need_mount
) {
1729 status
= nfs_request_mount(mount_info
->parsed
, mount_info
->mntfh
);
1731 return ERR_PTR(status
);
1734 /* Get a volume representation */
1735 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1737 return ERR_CAST(server
);
1739 return nfs_fs_mount_common(server
, flags
, dev_name
, mount_info
, nfs_mod
);
1741 EXPORT_SYMBOL_GPL(nfs_try_mount
);
1744 * Split "dev_name" into "hostname:export_path".
1746 * The leftmost colon demarks the split between the server's hostname
1747 * and the export path. If the hostname starts with a left square
1748 * bracket, then it may contain colons.
1750 * Note: caller frees hostname and export path, even on error.
1752 static int nfs_parse_devname(const char *dev_name
,
1753 char **hostname
, size_t maxnamlen
,
1754 char **export_path
, size_t maxpathlen
)
1759 /* Is the host name protected with square brakcets? */
1760 if (*dev_name
== '[') {
1761 end
= strchr(++dev_name
, ']');
1762 if (end
== NULL
|| end
[1] != ':')
1763 goto out_bad_devname
;
1765 len
= end
- dev_name
;
1770 end
= strchr(dev_name
, ':');
1772 goto out_bad_devname
;
1773 len
= end
- dev_name
;
1775 /* kill possible hostname list: not supported */
1776 comma
= strchr(dev_name
, ',');
1777 if (comma
!= NULL
&& comma
< end
)
1781 if (len
> maxnamlen
)
1784 /* N.B. caller will free nfs_server.hostname in all cases */
1785 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1786 if (*hostname
== NULL
)
1788 len
= strlen(++end
);
1789 if (len
> maxpathlen
)
1791 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1795 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1799 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1803 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1807 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1808 return -ENAMETOOLONG
;
1811 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1812 return -ENAMETOOLONG
;
1816 * Validate the NFS2/NFS3 mount data
1817 * - fills in the mount root filehandle
1819 * For option strings, user space handles the following behaviors:
1821 * + DNS: mapping server host name to IP address ("addr=" option)
1823 * + failure mode: how to behave if a mount request can't be handled
1824 * immediately ("fg/bg" option)
1826 * + retry: how often to retry a mount request ("retry=" option)
1828 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1829 * mountproto=tcp after mountproto=udp, and so on
1831 static int nfs23_validate_mount_data(void *options
,
1832 struct nfs_parsed_mount_data
*args
,
1833 struct nfs_fh
*mntfh
,
1834 const char *dev_name
)
1836 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1837 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1842 args
->version
= NFS_DEFAULT_VERSION
;
1843 switch (data
->version
) {
1849 if (data
->flags
& NFS_MOUNT_VER3
)
1851 data
->root
.size
= NFS2_FHSIZE
;
1852 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1854 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1857 memset(data
->context
, 0, sizeof(data
->context
));
1859 if (data
->flags
& NFS_MOUNT_VER3
) {
1860 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1861 goto out_invalid_fh
;
1862 mntfh
->size
= data
->root
.size
;
1865 mntfh
->size
= NFS2_FHSIZE
;
1870 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1871 if (mntfh
->size
< sizeof(mntfh
->data
))
1872 memset(mntfh
->data
+ mntfh
->size
, 0,
1873 sizeof(mntfh
->data
) - mntfh
->size
);
1876 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1879 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1880 args
->flags
|= NFS_MOUNT_LEGACY_INTERFACE
;
1881 args
->rsize
= data
->rsize
;
1882 args
->wsize
= data
->wsize
;
1883 args
->timeo
= data
->timeo
;
1884 args
->retrans
= data
->retrans
;
1885 args
->acregmin
= data
->acregmin
;
1886 args
->acregmax
= data
->acregmax
;
1887 args
->acdirmin
= data
->acdirmin
;
1888 args
->acdirmax
= data
->acdirmax
;
1889 args
->need_mount
= false;
1891 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1892 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1893 args
->nfs_server
.port
= ntohs(data
->addr
.sin_port
);
1894 if (!nfs_verify_server_address(sap
))
1895 goto out_no_address
;
1897 if (!(data
->flags
& NFS_MOUNT_TCP
))
1898 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1899 /* N.B. caller will free nfs_server.hostname in all cases */
1900 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1901 args
->namlen
= data
->namlen
;
1902 args
->bsize
= data
->bsize
;
1904 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1905 args
->auth_flavors
[0] = data
->pseudoflavor
;
1906 if (!args
->nfs_server
.hostname
)
1909 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1910 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1911 NFS_MOUNT_LOCAL_FCNTL
);
1913 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1914 NFS_MOUNT_LOCAL_FCNTL
);
1916 * The legacy version 6 binary mount data from userspace has a
1917 * field used only to transport selinux information into the
1918 * the kernel. To continue to support that functionality we
1919 * have a touch of selinux knowledge here in the NFS code. The
1920 * userspace code converted context=blah to just blah so we are
1921 * converting back to the full string selinux understands.
1923 if (data
->context
[0]){
1924 #ifdef CONFIG_SECURITY_SELINUX
1926 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1929 strcpy(opts_str
, "context=");
1930 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1931 strcat(opts_str
, &data
->context
[0]);
1932 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1943 return NFS_TEXT_DATA
;
1946 #if !IS_ENABLED(CONFIG_NFS_V3)
1947 if (args
->version
== 3)
1948 goto out_v3_not_compiled
;
1949 #endif /* !CONFIG_NFS_V3 */
1954 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1958 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1963 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1966 #if !IS_ENABLED(CONFIG_NFS_V3)
1967 out_v3_not_compiled
:
1968 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1969 return -EPROTONOSUPPORT
;
1970 #endif /* !CONFIG_NFS_V3 */
1973 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1977 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1981 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1985 #if IS_ENABLED(CONFIG_NFS_V4)
1986 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1988 struct nfs_parsed_mount_data
*args
,
1989 struct nfs_fh
*mntfh
,
1990 const char *dev_name
)
1992 if (fs_type
== &nfs_fs_type
)
1993 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
1994 return nfs4_validate_mount_data(options
, args
, dev_name
);
1997 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1999 struct nfs_parsed_mount_data
*args
,
2000 struct nfs_fh
*mntfh
,
2001 const char *dev_name
)
2003 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2007 static int nfs_validate_text_mount_data(void *options
,
2008 struct nfs_parsed_mount_data
*args
,
2009 const char *dev_name
)
2012 int max_namelen
= PAGE_SIZE
;
2013 int max_pathlen
= NFS_MAXPATHLEN
;
2014 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2016 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2019 if (!nfs_verify_server_address(sap
))
2020 goto out_no_address
;
2022 if (args
->version
== 4) {
2023 #if IS_ENABLED(CONFIG_NFS_V4)
2025 max_namelen
= NFS4_MAXNAMLEN
;
2026 max_pathlen
= NFS4_MAXPATHLEN
;
2027 nfs_validate_transport_protocol(args
);
2028 nfs4_validate_mount_flags(args
);
2030 goto out_v4_not_compiled
;
2031 #endif /* CONFIG_NFS_V4 */
2033 nfs_set_mount_transport_protocol(args
);
2035 nfs_set_port(sap
, &args
->nfs_server
.port
, port
);
2037 if (args
->auth_flavor_len
> 1)
2040 return nfs_parse_devname(dev_name
,
2041 &args
->nfs_server
.hostname
,
2043 &args
->nfs_server
.export_path
,
2046 #if !IS_ENABLED(CONFIG_NFS_V4)
2047 out_v4_not_compiled
:
2048 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2049 return -EPROTONOSUPPORT
;
2050 #endif /* !CONFIG_NFS_V4 */
2053 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2057 dfprintk(MOUNT
, "NFS: Too many RPC auth flavours specified\n");
2062 nfs_compare_remount_data(struct nfs_server
*nfss
,
2063 struct nfs_parsed_mount_data
*data
)
2065 if (data
->flags
!= nfss
->flags
||
2066 data
->rsize
!= nfss
->rsize
||
2067 data
->wsize
!= nfss
->wsize
||
2068 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
2069 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
2070 data
->acregmin
!= nfss
->acregmin
/ HZ
||
2071 data
->acregmax
!= nfss
->acregmax
/ HZ
||
2072 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
2073 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
2074 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
2075 data
->nfs_server
.port
!= nfss
->port
||
2076 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
2077 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
2078 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
2085 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
2088 struct nfs_server
*nfss
= sb
->s_fs_info
;
2089 struct nfs_parsed_mount_data
*data
;
2090 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
2091 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
2092 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
2095 * Userspace mount programs that send binary options generally send
2096 * them populated with default values. We have no way to know which
2097 * ones were explicitly specified. Fall back to legacy behavior and
2098 * just return success.
2100 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2101 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2102 options
->version
<= 6))))
2105 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2109 /* fill out struct with values from existing mount */
2110 data
->flags
= nfss
->flags
;
2111 data
->rsize
= nfss
->rsize
;
2112 data
->wsize
= nfss
->wsize
;
2113 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2114 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
2115 data
->acregmin
= nfss
->acregmin
/ HZ
;
2116 data
->acregmax
= nfss
->acregmax
/ HZ
;
2117 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2118 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2119 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2120 data
->nfs_server
.port
= nfss
->port
;
2121 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2122 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2123 data
->nfs_server
.addrlen
);
2125 /* overwrite those values with any that were specified */
2126 error
= nfs_parse_mount_options((char *)options
, data
);
2131 * noac is a special case. It implies -o sync, but that's not
2132 * necessarily reflected in the mtab options. do_remount_sb
2133 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2134 * remount options, so we have to explicitly reset it.
2136 if (data
->flags
& NFS_MOUNT_NOAC
)
2137 *flags
|= MS_SYNCHRONOUS
;
2139 /* compare new mount options with old ones */
2140 error
= nfs_compare_remount_data(nfss
, data
);
2145 EXPORT_SYMBOL_GPL(nfs_remount
);
2148 * Initialise the common bits of the superblock
2150 inline void nfs_initialise_sb(struct super_block
*sb
)
2152 struct nfs_server
*server
= NFS_SB(sb
);
2154 sb
->s_magic
= NFS_SUPER_MAGIC
;
2156 /* We probably want something more informative here */
2157 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2158 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2160 if (sb
->s_blocksize
== 0)
2161 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2162 &sb
->s_blocksize_bits
);
2164 sb
->s_bdi
= &server
->backing_dev_info
;
2166 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2170 * Finish setting up an NFS2/3 superblock
2172 void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2174 struct nfs_parsed_mount_data
*data
= mount_info
->parsed
;
2175 struct nfs_server
*server
= NFS_SB(sb
);
2177 sb
->s_blocksize_bits
= 0;
2178 sb
->s_blocksize
= 0;
2179 sb
->s_xattr
= server
->nfs_client
->cl_nfs_mod
->xattr
;
2180 sb
->s_op
= server
->nfs_client
->cl_nfs_mod
->sops
;
2181 if (data
&& data
->bsize
)
2182 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2184 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2185 /* The VFS shouldn't apply the umask to mode bits. We will do
2186 * so ourselves when necessary.
2188 sb
->s_flags
|= MS_POSIXACL
;
2189 sb
->s_time_gran
= 1;
2192 nfs_initialise_sb(sb
);
2194 EXPORT_SYMBOL_GPL(nfs_fill_super
);
2197 * Finish setting up a cloned NFS2/3/4 superblock
2199 void nfs_clone_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2201 const struct super_block
*old_sb
= mount_info
->cloned
->sb
;
2202 struct nfs_server
*server
= NFS_SB(sb
);
2204 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2205 sb
->s_blocksize
= old_sb
->s_blocksize
;
2206 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2207 sb
->s_xattr
= old_sb
->s_xattr
;
2208 sb
->s_op
= old_sb
->s_op
;
2209 sb
->s_time_gran
= 1;
2211 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2212 /* The VFS shouldn't apply the umask to mode bits. We will do
2213 * so ourselves when necessary.
2215 sb
->s_flags
|= MS_POSIXACL
;
2218 nfs_initialise_sb(sb
);
2221 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2223 const struct nfs_server
*a
= s
->s_fs_info
;
2224 const struct rpc_clnt
*clnt_a
= a
->client
;
2225 const struct rpc_clnt
*clnt_b
= b
->client
;
2227 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2229 if (a
->nfs_client
!= b
->nfs_client
)
2231 if (a
->flags
!= b
->flags
)
2233 if (a
->wsize
!= b
->wsize
)
2235 if (a
->rsize
!= b
->rsize
)
2237 if (a
->acregmin
!= b
->acregmin
)
2239 if (a
->acregmax
!= b
->acregmax
)
2241 if (a
->acdirmin
!= b
->acdirmin
)
2243 if (a
->acdirmax
!= b
->acdirmax
)
2245 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2252 struct nfs_sb_mountdata
{
2253 struct nfs_server
*server
;
2257 static int nfs_set_super(struct super_block
*s
, void *data
)
2259 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2260 struct nfs_server
*server
= sb_mntdata
->server
;
2263 s
->s_flags
= sb_mntdata
->mntflags
;
2264 s
->s_fs_info
= server
;
2265 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2266 ret
= set_anon_super(s
, server
);
2268 server
->s_dev
= s
->s_dev
;
2272 static int nfs_compare_super_address(struct nfs_server
*server1
,
2273 struct nfs_server
*server2
)
2275 struct sockaddr
*sap1
, *sap2
;
2277 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2278 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2280 if (sap1
->sa_family
!= sap2
->sa_family
)
2283 switch (sap1
->sa_family
) {
2285 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2286 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2287 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2289 if (sin1
->sin_port
!= sin2
->sin_port
)
2294 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2295 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2296 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2298 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2309 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2311 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2312 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2313 int mntflags
= sb_mntdata
->mntflags
;
2315 if (!nfs_compare_super_address(old
, server
))
2317 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2318 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2320 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2322 return nfs_compare_mount_options(sb
, server
, mntflags
);
2325 #ifdef CONFIG_NFS_FSCACHE
2326 static void nfs_get_cache_cookie(struct super_block
*sb
,
2327 struct nfs_parsed_mount_data
*parsed
,
2328 struct nfs_clone_mount
*cloned
)
2330 struct nfs_server
*nfss
= NFS_SB(sb
);
2334 nfss
->fscache_key
= NULL
;
2335 nfss
->fscache
= NULL
;
2338 if (!(parsed
->options
& NFS_OPTION_FSCACHE
))
2340 if (parsed
->fscache_uniq
) {
2341 uniq
= parsed
->fscache_uniq
;
2342 ulen
= strlen(parsed
->fscache_uniq
);
2344 } else if (cloned
) {
2345 struct nfs_server
*mnt_s
= NFS_SB(cloned
->sb
);
2346 if (!(mnt_s
->options
& NFS_OPTION_FSCACHE
))
2348 if (mnt_s
->fscache_key
) {
2349 uniq
= mnt_s
->fscache_key
->key
.uniquifier
;
2350 ulen
= mnt_s
->fscache_key
->key
.uniq_len
;
2355 nfs_fscache_get_super_cookie(sb
, uniq
, ulen
);
2358 static void nfs_get_cache_cookie(struct super_block
*sb
,
2359 struct nfs_parsed_mount_data
*parsed
,
2360 struct nfs_clone_mount
*cloned
)
2365 static int nfs_bdi_register(struct nfs_server
*server
)
2367 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2370 int nfs_set_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2371 struct nfs_mount_info
*mount_info
)
2373 return security_sb_set_mnt_opts(s
, &mount_info
->parsed
->lsm_opts
);
2375 EXPORT_SYMBOL_GPL(nfs_set_sb_security
);
2377 int nfs_clone_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2378 struct nfs_mount_info
*mount_info
)
2380 /* clone any lsm security options from the parent to the new sb */
2381 security_sb_clone_mnt_opts(mount_info
->cloned
->sb
, s
);
2382 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
)
2386 EXPORT_SYMBOL_GPL(nfs_clone_sb_security
);
2388 struct dentry
*nfs_fs_mount_common(struct nfs_server
*server
,
2389 int flags
, const char *dev_name
,
2390 struct nfs_mount_info
*mount_info
,
2391 struct nfs_subversion
*nfs_mod
)
2393 struct super_block
*s
;
2394 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2395 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2396 struct nfs_sb_mountdata sb_mntdata
= {
2402 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2403 compare_super
= NULL
;
2405 /* -o noac implies -o sync */
2406 if (server
->flags
& NFS_MOUNT_NOAC
)
2407 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2409 /* Get a superblock - note that we may end up sharing one that already exists */
2410 s
= sget(nfs_mod
->nfs_fs
, compare_super
, nfs_set_super
, flags
, &sb_mntdata
);
2412 mntroot
= ERR_CAST(s
);
2416 if (s
->s_fs_info
!= server
) {
2417 nfs_free_server(server
);
2420 error
= nfs_bdi_register(server
);
2422 mntroot
= ERR_PTR(error
);
2423 goto error_splat_bdi
;
2428 /* initial superblock/root creation */
2429 mount_info
->fill_super(s
, mount_info
);
2430 nfs_get_cache_cookie(s
, mount_info
->parsed
, mount_info
->cloned
);
2433 mntroot
= nfs_get_root(s
, mount_info
->mntfh
, dev_name
);
2434 if (IS_ERR(mntroot
))
2435 goto error_splat_super
;
2437 error
= mount_info
->set_security(s
, mntroot
, mount_info
);
2439 goto error_splat_root
;
2441 s
->s_flags
|= MS_ACTIVE
;
2447 nfs_free_server(server
);
2452 mntroot
= ERR_PTR(error
);
2454 if (server
&& !s
->s_root
)
2455 bdi_unregister(&server
->backing_dev_info
);
2457 deactivate_locked_super(s
);
2460 EXPORT_SYMBOL_GPL(nfs_fs_mount_common
);
2462 struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2463 int flags
, const char *dev_name
, void *raw_data
)
2465 struct nfs_mount_info mount_info
= {
2466 .fill_super
= nfs_fill_super
,
2467 .set_security
= nfs_set_sb_security
,
2469 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2470 struct nfs_subversion
*nfs_mod
;
2473 mount_info
.parsed
= nfs_alloc_parsed_mount_data();
2474 mount_info
.mntfh
= nfs_alloc_fhandle();
2475 if (mount_info
.parsed
== NULL
|| mount_info
.mntfh
== NULL
)
2478 /* Validate the mount data */
2479 error
= nfs_validate_mount_data(fs_type
, raw_data
, mount_info
.parsed
, mount_info
.mntfh
, dev_name
);
2480 if (error
== NFS_TEXT_DATA
)
2481 error
= nfs_validate_text_mount_data(raw_data
, mount_info
.parsed
, dev_name
);
2483 mntroot
= ERR_PTR(error
);
2487 nfs_mod
= get_nfs_version(mount_info
.parsed
->version
);
2488 if (IS_ERR(nfs_mod
)) {
2489 mntroot
= ERR_CAST(nfs_mod
);
2493 mntroot
= nfs_mod
->rpc_ops
->try_mount(flags
, dev_name
, &mount_info
, nfs_mod
);
2495 put_nfs_version(nfs_mod
);
2497 nfs_free_parsed_mount_data(mount_info
.parsed
);
2498 nfs_free_fhandle(mount_info
.mntfh
);
2501 EXPORT_SYMBOL_GPL(nfs_fs_mount
);
2504 * Ensure that we unregister the bdi before kill_anon_super
2505 * releases the device name
2507 void nfs_put_super(struct super_block
*s
)
2509 struct nfs_server
*server
= NFS_SB(s
);
2511 bdi_unregister(&server
->backing_dev_info
);
2513 EXPORT_SYMBOL_GPL(nfs_put_super
);
2516 * Destroy an NFS2/3 superblock
2518 void nfs_kill_super(struct super_block
*s
)
2520 struct nfs_server
*server
= NFS_SB(s
);
2523 nfs_fscache_release_super_cookie(s
);
2524 nfs_free_server(server
);
2526 EXPORT_SYMBOL_GPL(nfs_kill_super
);
2529 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2531 static struct dentry
*
2532 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2533 const char *dev_name
, void *raw_data
)
2535 struct nfs_clone_mount
*data
= raw_data
;
2536 struct nfs_mount_info mount_info
= {
2537 .fill_super
= nfs_clone_super
,
2538 .set_security
= nfs_clone_sb_security
,
2541 struct nfs_server
*server
;
2542 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2543 struct nfs_subversion
*nfs_mod
= NFS_SB(data
->sb
)->nfs_client
->cl_nfs_mod
;
2545 dprintk("--> nfs_xdev_mount()\n");
2547 mount_info
.mntfh
= mount_info
.cloned
->fh
;
2549 /* create a new volume representation */
2550 server
= nfs_mod
->rpc_ops
->clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2553 mntroot
= ERR_CAST(server
);
2555 mntroot
= nfs_fs_mount_common(server
, flags
,
2556 dev_name
, &mount_info
, nfs_mod
);
2558 dprintk("<-- nfs_xdev_mount() = %ld\n",
2559 IS_ERR(mntroot
) ? PTR_ERR(mntroot
) : 0L);
2563 #if IS_ENABLED(CONFIG_NFS_V4)
2565 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2567 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2568 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2572 * Validate NFSv4 mount options
2574 static int nfs4_validate_mount_data(void *options
,
2575 struct nfs_parsed_mount_data
*args
,
2576 const char *dev_name
)
2578 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2579 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2587 switch (data
->version
) {
2589 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2590 goto out_no_address
;
2591 if (data
->host_addrlen
== 0)
2592 goto out_no_address
;
2593 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2594 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2596 if (!nfs_verify_server_address(sap
))
2597 goto out_no_address
;
2598 args
->nfs_server
.port
= ntohs(((struct sockaddr_in
*)sap
)->sin_port
);
2600 if (data
->auth_flavourlen
) {
2601 if (data
->auth_flavourlen
> 1)
2602 goto out_inval_auth
;
2603 if (copy_from_user(&args
->auth_flavors
[0],
2604 data
->auth_flavours
,
2605 sizeof(args
->auth_flavors
[0])))
2609 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2612 args
->nfs_server
.hostname
= c
;
2614 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2617 args
->nfs_server
.export_path
= c
;
2618 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2620 c
= strndup_user(data
->client_addr
.data
, 16);
2623 args
->client_address
= c
;
2626 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2630 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2631 args
->rsize
= data
->rsize
;
2632 args
->wsize
= data
->wsize
;
2633 args
->timeo
= data
->timeo
;
2634 args
->retrans
= data
->retrans
;
2635 args
->acregmin
= data
->acregmin
;
2636 args
->acregmax
= data
->acregmax
;
2637 args
->acdirmin
= data
->acdirmin
;
2638 args
->acdirmax
= data
->acdirmax
;
2639 args
->nfs_server
.protocol
= data
->proto
;
2640 nfs_validate_transport_protocol(args
);
2644 return NFS_TEXT_DATA
;
2650 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2654 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2655 data
->auth_flavourlen
);
2659 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2664 * NFS v4 module parameters need to stay in the
2665 * NFS client for backwards compatibility
2667 unsigned int nfs_callback_set_tcpport
;
2668 unsigned short nfs_callback_tcpport
;
2669 /* Default cache timeout is 10 minutes */
2670 unsigned int nfs_idmap_cache_timeout
= 600;
2671 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2672 bool nfs4_disable_idmapping
= true;
2673 unsigned short max_session_slots
= NFS4_DEF_SLOT_TABLE_SIZE
;
2674 unsigned short send_implementation_id
= 1;
2675 char nfs4_client_id_uniquifier
[NFS4_CLIENT_ID_UNIQ_LEN
] = "";
2677 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport
);
2678 EXPORT_SYMBOL_GPL(nfs_callback_tcpport
);
2679 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout
);
2680 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping
);
2681 EXPORT_SYMBOL_GPL(max_session_slots
);
2682 EXPORT_SYMBOL_GPL(send_implementation_id
);
2683 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier
);
2685 #define NFS_CALLBACK_MAXPORTNR (65535U)
2687 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2694 ret
= kstrtoul(val
, 0, &num
);
2695 if (ret
== -EINVAL
|| num
> NFS_CALLBACK_MAXPORTNR
)
2697 *((unsigned int *)kp
->arg
) = num
;
2700 static struct kernel_param_ops param_ops_portnr
= {
2701 .set
= param_set_portnr
,
2702 .get
= param_get_uint
,
2704 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2706 module_param_named(callback_tcpport
, nfs_callback_set_tcpport
, portnr
, 0644);
2707 module_param(nfs_idmap_cache_timeout
, int, 0644);
2708 module_param(nfs4_disable_idmapping
, bool, 0644);
2709 module_param_string(nfs4_unique_id
, nfs4_client_id_uniquifier
,
2710 NFS4_CLIENT_ID_UNIQ_LEN
, 0600);
2711 MODULE_PARM_DESC(nfs4_disable_idmapping
,
2712 "Turn off NFSv4 idmapping when using 'sec=sys'");
2713 module_param(max_session_slots
, ushort
, 0644);
2714 MODULE_PARM_DESC(max_session_slots
, "Maximum number of outstanding NFSv4.1 "
2715 "requests the client will negotiate");
2716 module_param(send_implementation_id
, ushort
, 0644);
2717 MODULE_PARM_DESC(send_implementation_id
,
2718 "Send implementation ID with NFSv4.1 exchange_id");
2719 MODULE_PARM_DESC(nfs4_unique_id
, "nfs_client_id4 uniquifier string");
2720 MODULE_ALIAS("nfs4");
2722 #endif /* CONFIG_NFS_V4 */