4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
69 #define NFSDBG_FACILITY NFSDBG_VFS
70 #define NFS_TEXT_DATA 1
72 #if IS_ENABLED(CONFIG_NFS_V3)
73 #define NFS_DEFAULT_VERSION 3
75 #define NFS_DEFAULT_VERSION 2
79 /* Mount options that take no arguments */
81 Opt_posix
, Opt_noposix
,
85 Opt_udp
, Opt_tcp
, Opt_rdma
,
87 Opt_rdirplus
, Opt_nordirplus
,
88 Opt_sharecache
, Opt_nosharecache
,
89 Opt_resvport
, Opt_noresvport
,
90 Opt_fscache
, Opt_nofscache
,
91 Opt_migration
, Opt_nomigration
,
93 /* Mount options that take integer arguments */
95 Opt_rsize
, Opt_wsize
, Opt_bsize
,
96 Opt_timeo
, Opt_retrans
,
97 Opt_acregmin
, Opt_acregmax
,
98 Opt_acdirmin
, Opt_acdirmax
,
105 /* Mount options that take string arguments */
107 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
108 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
113 /* Special mount options */
114 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
119 static const match_table_t nfs_mount_option_tokens
= {
120 { Opt_userspace
, "bg" },
121 { Opt_userspace
, "fg" },
122 { Opt_userspace
, "retry=%s" },
124 { Opt_sloppy
, "sloppy" },
126 { Opt_soft
, "soft" },
127 { Opt_hard
, "hard" },
128 { Opt_deprecated
, "intr" },
129 { Opt_deprecated
, "nointr" },
130 { Opt_posix
, "posix" },
131 { Opt_noposix
, "noposix" },
133 { Opt_nocto
, "nocto" },
135 { Opt_noac
, "noac" },
136 { Opt_lock
, "lock" },
137 { Opt_nolock
, "nolock" },
140 { Opt_rdma
, "rdma" },
142 { Opt_noacl
, "noacl" },
143 { Opt_rdirplus
, "rdirplus" },
144 { Opt_nordirplus
, "nordirplus" },
145 { Opt_sharecache
, "sharecache" },
146 { Opt_nosharecache
, "nosharecache" },
147 { Opt_resvport
, "resvport" },
148 { Opt_noresvport
, "noresvport" },
149 { Opt_fscache
, "fsc" },
150 { Opt_nofscache
, "nofsc" },
151 { Opt_migration
, "migration" },
152 { Opt_nomigration
, "nomigration" },
154 { Opt_port
, "port=%s" },
155 { Opt_rsize
, "rsize=%s" },
156 { Opt_wsize
, "wsize=%s" },
157 { Opt_bsize
, "bsize=%s" },
158 { Opt_timeo
, "timeo=%s" },
159 { Opt_retrans
, "retrans=%s" },
160 { Opt_acregmin
, "acregmin=%s" },
161 { Opt_acregmax
, "acregmax=%s" },
162 { Opt_acdirmin
, "acdirmin=%s" },
163 { Opt_acdirmax
, "acdirmax=%s" },
164 { Opt_actimeo
, "actimeo=%s" },
165 { Opt_namelen
, "namlen=%s" },
166 { Opt_mountport
, "mountport=%s" },
167 { Opt_mountvers
, "mountvers=%s" },
168 { Opt_minorversion
, "minorversion=%s" },
170 { Opt_nfsvers
, "nfsvers=%s" },
171 { Opt_nfsvers
, "vers=%s" },
173 { Opt_sec
, "sec=%s" },
174 { Opt_proto
, "proto=%s" },
175 { Opt_mountproto
, "mountproto=%s" },
176 { Opt_addr
, "addr=%s" },
177 { Opt_clientaddr
, "clientaddr=%s" },
178 { Opt_mounthost
, "mounthost=%s" },
179 { Opt_mountaddr
, "mountaddr=%s" },
181 { Opt_lookupcache
, "lookupcache=%s" },
182 { Opt_fscache_uniq
, "fsc=%s" },
183 { Opt_local_lock
, "local_lock=%s" },
185 /* The following needs to be listed after all other options */
186 { Opt_nfsvers
, "v%s" },
192 Opt_xprt_udp
, Opt_xprt_udp6
, Opt_xprt_tcp
, Opt_xprt_tcp6
, Opt_xprt_rdma
,
197 static const match_table_t nfs_xprt_protocol_tokens
= {
198 { Opt_xprt_udp
, "udp" },
199 { Opt_xprt_udp6
, "udp6" },
200 { Opt_xprt_tcp
, "tcp" },
201 { Opt_xprt_tcp6
, "tcp6" },
202 { Opt_xprt_rdma
, "rdma" },
204 { Opt_xprt_err
, NULL
}
208 Opt_sec_none
, Opt_sec_sys
,
209 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
210 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
211 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
216 static const match_table_t nfs_secflavor_tokens
= {
217 { Opt_sec_none
, "none" },
218 { Opt_sec_none
, "null" },
219 { Opt_sec_sys
, "sys" },
221 { Opt_sec_krb5
, "krb5" },
222 { Opt_sec_krb5i
, "krb5i" },
223 { Opt_sec_krb5p
, "krb5p" },
225 { Opt_sec_lkey
, "lkey" },
226 { Opt_sec_lkeyi
, "lkeyi" },
227 { Opt_sec_lkeyp
, "lkeyp" },
229 { Opt_sec_spkm
, "spkm3" },
230 { Opt_sec_spkmi
, "spkm3i" },
231 { Opt_sec_spkmp
, "spkm3p" },
233 { Opt_sec_err
, NULL
}
237 Opt_lookupcache_all
, Opt_lookupcache_positive
,
238 Opt_lookupcache_none
,
243 static match_table_t nfs_lookupcache_tokens
= {
244 { Opt_lookupcache_all
, "all" },
245 { Opt_lookupcache_positive
, "pos" },
246 { Opt_lookupcache_positive
, "positive" },
247 { Opt_lookupcache_none
, "none" },
249 { Opt_lookupcache_err
, NULL
}
253 Opt_local_lock_all
, Opt_local_lock_flock
, Opt_local_lock_posix
,
259 static match_table_t nfs_local_lock_tokens
= {
260 { Opt_local_lock_all
, "all" },
261 { Opt_local_lock_flock
, "flock" },
262 { Opt_local_lock_posix
, "posix" },
263 { Opt_local_lock_none
, "none" },
265 { Opt_local_lock_err
, NULL
}
269 Opt_vers_2
, Opt_vers_3
, Opt_vers_4
, Opt_vers_4_0
,
275 static match_table_t nfs_vers_tokens
= {
279 { Opt_vers_4_0
, "4.0" },
280 { Opt_vers_4_1
, "4.1" },
282 { Opt_vers_err
, NULL
}
285 static struct dentry
*nfs_xdev_mount(struct file_system_type
*fs_type
,
286 int flags
, const char *dev_name
, void *raw_data
);
288 struct file_system_type nfs_fs_type
= {
289 .owner
= THIS_MODULE
,
291 .mount
= nfs_fs_mount
,
292 .kill_sb
= nfs_kill_super
,
293 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
295 EXPORT_SYMBOL_GPL(nfs_fs_type
);
297 struct file_system_type nfs_xdev_fs_type
= {
298 .owner
= THIS_MODULE
,
300 .mount
= nfs_xdev_mount
,
301 .kill_sb
= nfs_kill_super
,
302 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
305 const struct super_operations nfs_sops
= {
306 .alloc_inode
= nfs_alloc_inode
,
307 .destroy_inode
= nfs_destroy_inode
,
308 .write_inode
= nfs_write_inode
,
309 .put_super
= nfs_put_super
,
310 .statfs
= nfs_statfs
,
311 .evict_inode
= nfs_evict_inode
,
312 .umount_begin
= nfs_umount_begin
,
313 .show_options
= nfs_show_options
,
314 .show_devname
= nfs_show_devname
,
315 .show_path
= nfs_show_path
,
316 .show_stats
= nfs_show_stats
,
317 .remount_fs
= nfs_remount
,
319 EXPORT_SYMBOL_GPL(nfs_sops
);
321 #if IS_ENABLED(CONFIG_NFS_V4)
322 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*);
323 static int nfs4_validate_mount_data(void *options
,
324 struct nfs_parsed_mount_data
*args
, const char *dev_name
);
326 struct file_system_type nfs4_fs_type
= {
327 .owner
= THIS_MODULE
,
329 .mount
= nfs_fs_mount
,
330 .kill_sb
= nfs_kill_super
,
331 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
333 EXPORT_SYMBOL_GPL(nfs4_fs_type
);
335 static int __init
register_nfs4_fs(void)
337 return register_filesystem(&nfs4_fs_type
);
340 static void unregister_nfs4_fs(void)
342 unregister_filesystem(&nfs4_fs_type
);
345 static int __init
register_nfs4_fs(void)
350 static void unregister_nfs4_fs(void)
355 static struct shrinker acl_shrinker
= {
356 .shrink
= nfs_access_cache_shrinker
,
357 .seeks
= DEFAULT_SEEKS
,
361 * Register the NFS filesystems
363 int __init
register_nfs_fs(void)
367 ret
= register_filesystem(&nfs_fs_type
);
371 ret
= register_nfs4_fs();
375 ret
= nfs_register_sysctl();
378 register_shrinker(&acl_shrinker
);
382 unregister_nfs4_fs();
384 unregister_filesystem(&nfs_fs_type
);
390 * Unregister the NFS filesystems
392 void __exit
unregister_nfs_fs(void)
394 unregister_shrinker(&acl_shrinker
);
395 nfs_unregister_sysctl();
396 unregister_nfs4_fs();
397 unregister_filesystem(&nfs_fs_type
);
400 void nfs_sb_active(struct super_block
*sb
)
402 struct nfs_server
*server
= NFS_SB(sb
);
404 if (atomic_inc_return(&server
->active
) == 1)
405 atomic_inc(&sb
->s_active
);
407 EXPORT_SYMBOL_GPL(nfs_sb_active
);
409 void nfs_sb_deactive(struct super_block
*sb
)
411 struct nfs_server
*server
= NFS_SB(sb
);
413 if (atomic_dec_and_test(&server
->active
))
414 deactivate_super(sb
);
416 EXPORT_SYMBOL_GPL(nfs_sb_deactive
);
419 * Deliver file system statistics to userspace
421 int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
423 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
424 unsigned char blockbits
;
425 unsigned long blockres
;
426 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
427 struct nfs_fsstat res
;
430 res
.fattr
= nfs_alloc_fattr();
431 if (res
.fattr
== NULL
)
434 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
435 if (unlikely(error
== -ESTALE
)) {
436 struct dentry
*pd_dentry
;
438 pd_dentry
= dget_parent(dentry
);
439 if (pd_dentry
!= NULL
) {
440 nfs_zap_caches(pd_dentry
->d_inode
);
444 nfs_free_fattr(res
.fattr
);
448 buf
->f_type
= NFS_SUPER_MAGIC
;
451 * Current versions of glibc do not correctly handle the
452 * case where f_frsize != f_bsize. Eventually we want to
453 * report the value of wtmult in this field.
455 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
458 * On most *nix systems, f_blocks, f_bfree, and f_bavail
459 * are reported in units of f_frsize. Linux hasn't had
460 * an f_frsize field in its statfs struct until recently,
461 * thus historically Linux's sys_statfs reports these
462 * fields in units of f_bsize.
464 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
465 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
466 blockres
= (1 << blockbits
) - 1;
467 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
468 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
469 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
471 buf
->f_files
= res
.tfiles
;
472 buf
->f_ffree
= res
.afiles
;
474 buf
->f_namelen
= server
->namelen
;
479 dprintk("%s: statfs error = %d\n", __func__
, -error
);
482 EXPORT_SYMBOL_GPL(nfs_statfs
);
485 * Map the security flavour number to a name
487 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
489 static const struct {
490 rpc_authflavor_t flavour
;
493 { RPC_AUTH_NULL
, "null" },
494 { RPC_AUTH_UNIX
, "sys" },
495 { RPC_AUTH_GSS_KRB5
, "krb5" },
496 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
497 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
498 { RPC_AUTH_GSS_LKEY
, "lkey" },
499 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
500 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
501 { RPC_AUTH_GSS_SPKM
, "spkm" },
502 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
503 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
504 { UINT_MAX
, "unknown" }
508 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
509 if (sec_flavours
[i
].flavour
== flavour
)
512 return sec_flavours
[i
].str
;
515 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
518 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
520 seq_printf(m
, ",mountproto=");
521 switch (sap
->sa_family
) {
523 switch (nfss
->mountd_protocol
) {
525 seq_printf(m
, RPCBIND_NETID_UDP
);
528 seq_printf(m
, RPCBIND_NETID_TCP
);
532 seq_printf(m
, "auto");
536 switch (nfss
->mountd_protocol
) {
538 seq_printf(m
, RPCBIND_NETID_UDP6
);
541 seq_printf(m
, RPCBIND_NETID_TCP6
);
545 seq_printf(m
, "auto");
550 seq_printf(m
, "auto");
554 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
557 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
559 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
562 switch (sap
->sa_family
) {
564 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
565 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
569 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
570 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
575 seq_printf(m
, ",mountaddr=unspecified");
578 if (nfss
->mountd_version
|| showdefaults
)
579 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
580 if ((nfss
->mountd_port
&&
581 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
583 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
585 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
588 #if IS_ENABLED(CONFIG_NFS_V4)
589 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
592 struct nfs_client
*clp
= nfss
->nfs_client
;
594 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
597 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
603 static void nfs_show_nfs_version(struct seq_file
*m
,
604 unsigned int version
,
605 unsigned int minorversion
)
607 seq_printf(m
, ",vers=%u", version
);
609 seq_printf(m
, ".%u", minorversion
);
613 * Describe the mount options in force on this server representation
615 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
618 static const struct proc_nfs_info
{
623 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
624 { NFS_MOUNT_POSIX
, ",posix", "" },
625 { NFS_MOUNT_NOCTO
, ",nocto", "" },
626 { NFS_MOUNT_NOAC
, ",noac", "" },
627 { NFS_MOUNT_NONLM
, ",nolock", "" },
628 { NFS_MOUNT_NOACL
, ",noacl", "" },
629 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
630 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
631 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
634 const struct proc_nfs_info
*nfs_infop
;
635 struct nfs_client
*clp
= nfss
->nfs_client
;
636 u32 version
= clp
->rpc_ops
->version
;
637 int local_flock
, local_fcntl
;
639 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
640 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
641 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
642 if (nfss
->bsize
!= 0)
643 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
644 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
645 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
646 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
647 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
648 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
649 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
650 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
651 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
652 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
653 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
654 if (nfss
->flags
& nfs_infop
->flag
)
655 seq_puts(m
, nfs_infop
->str
);
657 seq_puts(m
, nfs_infop
->nostr
);
660 seq_printf(m
, ",proto=%s",
661 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
664 if (nfss
->port
!= NFS_PORT
)
665 seq_printf(m
, ",port=%u", nfss
->port
);
668 seq_printf(m
, ",port=%u", nfss
->port
);
670 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
671 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
672 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
675 nfs_show_mountd_options(m
, nfss
, showdefaults
);
677 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
679 if (nfss
->options
& NFS_OPTION_FSCACHE
)
680 seq_printf(m
, ",fsc");
682 if (nfss
->options
& NFS_OPTION_MIGRATION
)
683 seq_printf(m
, ",migration");
685 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
686 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
687 seq_printf(m
, ",lookupcache=none");
689 seq_printf(m
, ",lookupcache=pos");
692 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
693 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
695 if (!local_flock
&& !local_fcntl
)
696 seq_printf(m
, ",local_lock=none");
697 else if (local_flock
&& local_fcntl
)
698 seq_printf(m
, ",local_lock=all");
699 else if (local_flock
)
700 seq_printf(m
, ",local_lock=flock");
702 seq_printf(m
, ",local_lock=posix");
706 * Describe the mount options on this VFS mountpoint
708 int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
710 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
712 nfs_show_mount_options(m
, nfss
, 0);
715 seq_printf(m
, ",addr=%s",
716 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
722 EXPORT_SYMBOL_GPL(nfs_show_options
);
724 #if IS_ENABLED(CONFIG_NFS_V4)
725 #ifdef CONFIG_NFS_V4_1
726 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
728 if (nfs4_has_session(server
->nfs_client
))
729 seq_printf(m
, ",sessions");
732 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
736 #ifdef CONFIG_NFS_V4_1
737 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
739 seq_printf(m
, ",pnfs=");
740 if (server
->pnfs_curr_ld
)
741 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
743 seq_printf(m
, "not configured");
746 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
748 if (nfss
->nfs_client
&& nfss
->nfs_client
->cl_implid
) {
749 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->cl_implid
;
750 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
752 impl_id
->name
, impl_id
->domain
,
753 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
757 #if IS_ENABLED(CONFIG_NFS_V4)
758 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
762 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
767 int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
769 char *page
= (char *) __get_free_page(GFP_KERNEL
);
770 char *devname
, *dummy
;
774 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
);
776 err
= PTR_ERR(devname
);
778 seq_escape(m
, devname
, " \t\n\\");
779 free_page((unsigned long)page
);
782 EXPORT_SYMBOL_GPL(nfs_show_devname
);
784 int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
789 EXPORT_SYMBOL_GPL(nfs_show_path
);
792 * Present statistical information for this VFS mountpoint
794 int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
797 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
798 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
799 struct nfs_iostats totals
= { };
801 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
804 * Display all mount option settings
806 seq_printf(m
, "\n\topts:\t");
807 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
808 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
809 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
810 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
811 nfs_show_mount_options(m
, nfss
, 1);
813 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
815 show_implementation_id(m
, nfss
);
817 seq_printf(m
, "\n\tcaps:\t");
818 seq_printf(m
, "caps=0x%x", nfss
->caps
);
819 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
820 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
821 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
822 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
824 #if IS_ENABLED(CONFIG_NFS_V4)
825 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
826 seq_printf(m
, "\n\tnfsv4:\t");
827 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
828 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
829 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
830 show_sessions(m
, nfss
);
836 * Display security flavor in effect for this mount
838 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
840 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
843 * Display superblock I/O counters
845 for_each_possible_cpu(cpu
) {
846 struct nfs_iostats
*stats
;
849 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
851 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
852 totals
.events
[i
] += stats
->events
[i
];
853 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
854 totals
.bytes
[i
] += stats
->bytes
[i
];
855 #ifdef CONFIG_NFS_FSCACHE
856 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
857 totals
.fscache
[i
] += stats
->fscache
[i
];
863 seq_printf(m
, "\n\tevents:\t");
864 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
865 seq_printf(m
, "%lu ", totals
.events
[i
]);
866 seq_printf(m
, "\n\tbytes:\t");
867 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
868 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
869 #ifdef CONFIG_NFS_FSCACHE
870 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
871 seq_printf(m
, "\n\tfsc:\t");
872 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
873 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
878 rpc_print_iostats(m
, nfss
->client
);
882 EXPORT_SYMBOL_GPL(nfs_show_stats
);
885 * Begin unmount by attempting to remove all automounted mountpoints we added
886 * in response to xdev traversals and referrals
888 void nfs_umount_begin(struct super_block
*sb
)
890 struct nfs_server
*server
;
891 struct rpc_clnt
*rpc
;
894 /* -EIO all pending I/O */
895 rpc
= server
->client_acl
;
897 rpc_killall_tasks(rpc
);
898 rpc
= server
->client
;
900 rpc_killall_tasks(rpc
);
902 EXPORT_SYMBOL_GPL(nfs_umount_begin
);
904 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(void)
906 struct nfs_parsed_mount_data
*data
;
908 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
910 data
->acregmin
= NFS_DEF_ACREGMIN
;
911 data
->acregmax
= NFS_DEF_ACREGMAX
;
912 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
913 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
914 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
915 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
916 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
917 data
->auth_flavors
[0] = RPC_AUTH_UNIX
;
918 data
->auth_flavor_len
= 1;
919 data
->minorversion
= 0;
920 data
->need_mount
= true;
921 data
->net
= current
->nsproxy
->net_ns
;
922 security_init_mnt_opts(&data
->lsm_opts
);
927 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data
*data
)
930 kfree(data
->client_address
);
931 kfree(data
->mount_server
.hostname
);
932 kfree(data
->nfs_server
.export_path
);
933 kfree(data
->nfs_server
.hostname
);
934 kfree(data
->fscache_uniq
);
935 security_free_mnt_opts(&data
->lsm_opts
);
941 * Sanity-check a server address provided by the mount command.
943 * Address family must be initialized, and address must not be
944 * the ANY address for that family.
946 static int nfs_verify_server_address(struct sockaddr
*addr
)
948 switch (addr
->sa_family
) {
950 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
951 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
954 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
955 return !ipv6_addr_any(sa
);
959 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
964 * Select between a default port value and a user-specified port value.
965 * If a zero value is set, then autobind will be used.
967 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
968 const unsigned short default_port
)
970 if (*port
== NFS_UNSPEC_PORT
)
971 *port
= default_port
;
973 rpc_set_port(sap
, *port
);
977 * Sanity check the NFS transport protocol.
980 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
982 switch (mnt
->nfs_server
.protocol
) {
983 case XPRT_TRANSPORT_UDP
:
984 case XPRT_TRANSPORT_TCP
:
985 case XPRT_TRANSPORT_RDMA
:
988 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
993 * For text based NFSv2/v3 mounts, the mount protocol transport default
994 * settings should depend upon the specified NFS transport.
996 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
998 nfs_validate_transport_protocol(mnt
);
1000 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
1001 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
1003 switch (mnt
->nfs_server
.protocol
) {
1004 case XPRT_TRANSPORT_UDP
:
1005 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1007 case XPRT_TRANSPORT_TCP
:
1008 case XPRT_TRANSPORT_RDMA
:
1009 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1014 * Parse the value of the 'sec=' option.
1016 static int nfs_parse_security_flavors(char *value
,
1017 struct nfs_parsed_mount_data
*mnt
)
1019 substring_t args
[MAX_OPT_ARGS
];
1021 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1023 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
1025 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
1028 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1031 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
1034 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
1037 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
1040 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
1043 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
1046 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1049 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1052 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1055 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1061 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1062 mnt
->auth_flavor_len
= 1;
1066 static int nfs_parse_version_string(char *string
,
1067 struct nfs_parsed_mount_data
*mnt
,
1070 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1071 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1076 mnt
->flags
|= NFS_MOUNT_VER3
;
1080 /* Backward compatibility option. In future,
1081 * the mount program should always supply
1082 * a NFSv4 minor version number.
1088 mnt
->minorversion
= 0;
1092 mnt
->minorversion
= 1;
1100 static int nfs_get_option_str(substring_t args
[], char **option
)
1103 *option
= match_strdup(args
);
1107 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1112 string
= match_strdup(args
);
1115 rc
= kstrtoul(string
, 10, option
);
1122 * Error-check and convert a string of mount options from user space into
1123 * a data structure. The whole mount string is processed; bad options are
1124 * skipped as they are encountered. If there were no errors, return 1;
1125 * otherwise return 0 (zero).
1127 static int nfs_parse_mount_options(char *raw
,
1128 struct nfs_parsed_mount_data
*mnt
)
1130 char *p
, *string
, *secdata
;
1131 int rc
, sloppy
= 0, invalid_option
= 0;
1132 unsigned short protofamily
= AF_UNSPEC
;
1133 unsigned short mountfamily
= AF_UNSPEC
;
1136 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1139 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1141 secdata
= alloc_secdata();
1145 rc
= security_sb_copy_data(raw
, secdata
);
1147 goto out_security_failure
;
1149 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1151 goto out_security_failure
;
1153 free_secdata(secdata
);
1155 while ((p
= strsep(&raw
, ",")) != NULL
) {
1156 substring_t args
[MAX_OPT_ARGS
];
1157 unsigned long option
;
1163 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1165 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1169 * boolean options: foo/nofoo
1172 mnt
->flags
|= NFS_MOUNT_SOFT
;
1175 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1178 mnt
->flags
|= NFS_MOUNT_POSIX
;
1181 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1184 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1187 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1190 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1193 mnt
->flags
|= NFS_MOUNT_NOAC
;
1196 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1197 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1198 NFS_MOUNT_LOCAL_FCNTL
);
1201 mnt
->flags
|= NFS_MOUNT_NONLM
;
1202 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1203 NFS_MOUNT_LOCAL_FCNTL
);
1206 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1207 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1210 mnt
->flags
|= NFS_MOUNT_TCP
;
1211 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1214 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1215 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1216 xprt_load_transport(p
);
1219 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1222 mnt
->flags
|= NFS_MOUNT_NOACL
;
1225 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1227 case Opt_nordirplus
:
1228 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1230 case Opt_sharecache
:
1231 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1233 case Opt_nosharecache
:
1234 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1237 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1239 case Opt_noresvport
:
1240 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1243 mnt
->options
|= NFS_OPTION_FSCACHE
;
1244 kfree(mnt
->fscache_uniq
);
1245 mnt
->fscache_uniq
= NULL
;
1248 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1249 kfree(mnt
->fscache_uniq
);
1250 mnt
->fscache_uniq
= NULL
;
1253 mnt
->options
|= NFS_OPTION_MIGRATION
;
1255 case Opt_nomigration
:
1256 mnt
->options
&= NFS_OPTION_MIGRATION
;
1260 * options that take numeric values
1263 if (nfs_get_option_ul(args
, &option
) ||
1265 goto out_invalid_value
;
1266 mnt
->nfs_server
.port
= option
;
1269 if (nfs_get_option_ul(args
, &option
))
1270 goto out_invalid_value
;
1271 mnt
->rsize
= option
;
1274 if (nfs_get_option_ul(args
, &option
))
1275 goto out_invalid_value
;
1276 mnt
->wsize
= option
;
1279 if (nfs_get_option_ul(args
, &option
))
1280 goto out_invalid_value
;
1281 mnt
->bsize
= option
;
1284 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1285 goto out_invalid_value
;
1286 mnt
->timeo
= option
;
1289 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1290 goto out_invalid_value
;
1291 mnt
->retrans
= option
;
1294 if (nfs_get_option_ul(args
, &option
))
1295 goto out_invalid_value
;
1296 mnt
->acregmin
= option
;
1299 if (nfs_get_option_ul(args
, &option
))
1300 goto out_invalid_value
;
1301 mnt
->acregmax
= option
;
1304 if (nfs_get_option_ul(args
, &option
))
1305 goto out_invalid_value
;
1306 mnt
->acdirmin
= option
;
1309 if (nfs_get_option_ul(args
, &option
))
1310 goto out_invalid_value
;
1311 mnt
->acdirmax
= option
;
1314 if (nfs_get_option_ul(args
, &option
))
1315 goto out_invalid_value
;
1316 mnt
->acregmin
= mnt
->acregmax
=
1317 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1320 if (nfs_get_option_ul(args
, &option
))
1321 goto out_invalid_value
;
1322 mnt
->namlen
= option
;
1325 if (nfs_get_option_ul(args
, &option
) ||
1327 goto out_invalid_value
;
1328 mnt
->mount_server
.port
= option
;
1331 if (nfs_get_option_ul(args
, &option
) ||
1332 option
< NFS_MNT_VERSION
||
1333 option
> NFS_MNT3_VERSION
)
1334 goto out_invalid_value
;
1335 mnt
->mount_server
.version
= option
;
1337 case Opt_minorversion
:
1338 if (nfs_get_option_ul(args
, &option
))
1339 goto out_invalid_value
;
1340 if (option
> NFS4_MAX_MINOR_VERSION
)
1341 goto out_invalid_value
;
1342 mnt
->minorversion
= option
;
1346 * options that take text values
1349 string
= match_strdup(args
);
1352 rc
= nfs_parse_version_string(string
, mnt
, args
);
1355 goto out_invalid_value
;
1358 string
= match_strdup(args
);
1361 rc
= nfs_parse_security_flavors(string
, mnt
);
1364 dfprintk(MOUNT
, "NFS: unrecognized "
1365 "security flavor\n");
1370 string
= match_strdup(args
);
1373 token
= match_token(string
,
1374 nfs_xprt_protocol_tokens
, args
);
1376 protofamily
= AF_INET
;
1379 protofamily
= AF_INET6
;
1381 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1382 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1385 protofamily
= AF_INET6
;
1387 mnt
->flags
|= NFS_MOUNT_TCP
;
1388 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1391 /* vector side protocols to TCP */
1392 mnt
->flags
|= NFS_MOUNT_TCP
;
1393 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1394 xprt_load_transport(string
);
1397 dfprintk(MOUNT
, "NFS: unrecognized "
1398 "transport protocol\n");
1404 case Opt_mountproto
:
1405 string
= match_strdup(args
);
1408 token
= match_token(string
,
1409 nfs_xprt_protocol_tokens
, args
);
1412 mountfamily
= AF_INET
;
1415 mountfamily
= AF_INET6
;
1417 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1420 mountfamily
= AF_INET6
;
1422 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1424 case Opt_xprt_rdma
: /* not used for side protocols */
1426 dfprintk(MOUNT
, "NFS: unrecognized "
1427 "transport protocol\n");
1432 string
= match_strdup(args
);
1435 mnt
->nfs_server
.addrlen
=
1436 rpc_pton(mnt
->net
, string
, strlen(string
),
1438 &mnt
->nfs_server
.address
,
1439 sizeof(mnt
->nfs_server
.address
));
1441 if (mnt
->nfs_server
.addrlen
== 0)
1442 goto out_invalid_address
;
1444 case Opt_clientaddr
:
1445 if (nfs_get_option_str(args
, &mnt
->client_address
))
1449 if (nfs_get_option_str(args
,
1450 &mnt
->mount_server
.hostname
))
1454 string
= match_strdup(args
);
1457 mnt
->mount_server
.addrlen
=
1458 rpc_pton(mnt
->net
, string
, strlen(string
),
1460 &mnt
->mount_server
.address
,
1461 sizeof(mnt
->mount_server
.address
));
1463 if (mnt
->mount_server
.addrlen
== 0)
1464 goto out_invalid_address
;
1466 case Opt_lookupcache
:
1467 string
= match_strdup(args
);
1470 token
= match_token(string
,
1471 nfs_lookupcache_tokens
, args
);
1474 case Opt_lookupcache_all
:
1475 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1477 case Opt_lookupcache_positive
:
1478 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1479 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1481 case Opt_lookupcache_none
:
1482 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1485 dfprintk(MOUNT
, "NFS: invalid "
1486 "lookupcache argument\n");
1490 case Opt_fscache_uniq
:
1491 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1493 mnt
->options
|= NFS_OPTION_FSCACHE
;
1495 case Opt_local_lock
:
1496 string
= match_strdup(args
);
1499 token
= match_token(string
, nfs_local_lock_tokens
,
1503 case Opt_local_lock_all
:
1504 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1505 NFS_MOUNT_LOCAL_FCNTL
);
1507 case Opt_local_lock_flock
:
1508 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1510 case Opt_local_lock_posix
:
1511 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1513 case Opt_local_lock_none
:
1514 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1515 NFS_MOUNT_LOCAL_FCNTL
);
1518 dfprintk(MOUNT
, "NFS: invalid "
1519 "local_lock argument\n");
1529 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1532 case Opt_deprecated
:
1533 dfprintk(MOUNT
, "NFS: ignoring mount option "
1539 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1544 if (!sloppy
&& invalid_option
)
1547 if (mnt
->minorversion
&& mnt
->version
!= 4)
1548 goto out_minorversion_mismatch
;
1550 if (mnt
->options
& NFS_OPTION_MIGRATION
&&
1551 mnt
->version
!= 4 && mnt
->minorversion
!= 0)
1552 goto out_migration_misuse
;
1555 * verify that any proto=/mountproto= options match the address
1556 * families in the addr=/mountaddr= options.
1558 if (protofamily
!= AF_UNSPEC
&&
1559 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1560 goto out_proto_mismatch
;
1562 if (mountfamily
!= AF_UNSPEC
) {
1563 if (mnt
->mount_server
.addrlen
) {
1564 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1565 goto out_mountproto_mismatch
;
1567 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1568 goto out_mountproto_mismatch
;
1574 out_mountproto_mismatch
:
1575 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1579 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1581 out_invalid_address
:
1582 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1585 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1587 out_minorversion_mismatch
:
1588 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1589 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1591 out_migration_misuse
:
1593 "NFS: 'migration' not supported for this NFS version\n");
1596 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1598 out_security_failure
:
1599 free_secdata(secdata
);
1600 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1605 * Match the requested auth flavors with the list returned by
1606 * the server. Returns zero and sets the mount's authentication
1607 * flavor on success; returns -EACCES if server does not support
1608 * the requested flavor.
1610 static int nfs_walk_authlist(struct nfs_parsed_mount_data
*args
,
1611 struct nfs_mount_request
*request
)
1613 unsigned int i
, j
, server_authlist_len
= *(request
->auth_flav_len
);
1616 * Certain releases of Linux's mountd return an empty
1617 * flavor list. To prevent behavioral regression with
1618 * these servers (ie. rejecting mounts that used to
1619 * succeed), revert to pre-2.6.32 behavior (no checking)
1620 * if the returned flavor list is empty.
1622 if (server_authlist_len
== 0)
1626 * We avoid sophisticated negotiating here, as there are
1627 * plenty of cases where we can get it wrong, providing
1628 * either too little or too much security.
1630 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1631 * flavor listed first. However, some servers list
1632 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1633 * preferred default, in args->auth_flavors[0] if user
1634 * didn't specify sec= mount option.
1636 for (i
= 0; i
< args
->auth_flavor_len
; i
++)
1637 for (j
= 0; j
< server_authlist_len
; j
++)
1638 if (args
->auth_flavors
[i
] == request
->auth_flavs
[j
]) {
1639 dfprintk(MOUNT
, "NFS: using auth flavor %d\n",
1640 request
->auth_flavs
[j
]);
1641 args
->auth_flavors
[0] = request
->auth_flavs
[j
];
1645 dfprintk(MOUNT
, "NFS: server does not support requested auth flavor\n");
1646 nfs_umount(request
);
1651 * Use the remote server's MOUNT service to request the NFS file handle
1652 * corresponding to the provided path.
1654 static int nfs_request_mount(struct nfs_parsed_mount_data
*args
,
1655 struct nfs_fh
*root_fh
)
1657 rpc_authflavor_t server_authlist
[NFS_MAX_SECFLAVORS
];
1658 unsigned int server_authlist_len
= ARRAY_SIZE(server_authlist
);
1659 struct nfs_mount_request request
= {
1660 .sap
= (struct sockaddr
*)
1661 &args
->mount_server
.address
,
1662 .dirpath
= args
->nfs_server
.export_path
,
1663 .protocol
= args
->mount_server
.protocol
,
1665 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1666 .auth_flav_len
= &server_authlist_len
,
1667 .auth_flavs
= server_authlist
,
1672 if (args
->mount_server
.version
== 0) {
1673 switch (args
->version
) {
1675 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1678 args
->mount_server
.version
= NFS_MNT_VERSION
;
1681 request
.version
= args
->mount_server
.version
;
1683 if (args
->mount_server
.hostname
)
1684 request
.hostname
= args
->mount_server
.hostname
;
1686 request
.hostname
= args
->nfs_server
.hostname
;
1689 * Construct the mount server's address.
1691 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1692 memcpy(request
.sap
, &args
->nfs_server
.address
,
1693 args
->nfs_server
.addrlen
);
1694 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1696 request
.salen
= args
->mount_server
.addrlen
;
1697 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1700 * Now ask the mount server to map our export path
1703 status
= nfs_mount(&request
);
1705 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1706 request
.hostname
, status
);
1711 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1713 if (args
->mount_server
.version
!= NFS_MNT3_VERSION
)
1715 return nfs_walk_authlist(args
, &request
);
1718 struct dentry
*nfs_try_mount(int flags
, const char *dev_name
,
1719 struct nfs_mount_info
*mount_info
,
1720 struct nfs_subversion
*nfs_mod
)
1723 struct nfs_server
*server
;
1725 if (mount_info
->parsed
->need_mount
) {
1726 status
= nfs_request_mount(mount_info
->parsed
, mount_info
->mntfh
);
1728 return ERR_PTR(status
);
1731 /* Get a volume representation */
1732 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1734 return ERR_CAST(server
);
1736 return nfs_fs_mount_common(server
, flags
, dev_name
, mount_info
, nfs_mod
);
1738 EXPORT_SYMBOL_GPL(nfs_try_mount
);
1741 * Split "dev_name" into "hostname:export_path".
1743 * The leftmost colon demarks the split between the server's hostname
1744 * and the export path. If the hostname starts with a left square
1745 * bracket, then it may contain colons.
1747 * Note: caller frees hostname and export path, even on error.
1749 static int nfs_parse_devname(const char *dev_name
,
1750 char **hostname
, size_t maxnamlen
,
1751 char **export_path
, size_t maxpathlen
)
1756 /* Is the host name protected with square brakcets? */
1757 if (*dev_name
== '[') {
1758 end
= strchr(++dev_name
, ']');
1759 if (end
== NULL
|| end
[1] != ':')
1760 goto out_bad_devname
;
1762 len
= end
- dev_name
;
1767 end
= strchr(dev_name
, ':');
1769 goto out_bad_devname
;
1770 len
= end
- dev_name
;
1772 /* kill possible hostname list: not supported */
1773 comma
= strchr(dev_name
, ',');
1774 if (comma
!= NULL
&& comma
< end
)
1778 if (len
> maxnamlen
)
1781 /* N.B. caller will free nfs_server.hostname in all cases */
1782 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1783 if (*hostname
== NULL
)
1785 len
= strlen(++end
);
1786 if (len
> maxpathlen
)
1788 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1792 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1796 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1800 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1804 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1805 return -ENAMETOOLONG
;
1808 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1809 return -ENAMETOOLONG
;
1813 * Validate the NFS2/NFS3 mount data
1814 * - fills in the mount root filehandle
1816 * For option strings, user space handles the following behaviors:
1818 * + DNS: mapping server host name to IP address ("addr=" option)
1820 * + failure mode: how to behave if a mount request can't be handled
1821 * immediately ("fg/bg" option)
1823 * + retry: how often to retry a mount request ("retry=" option)
1825 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1826 * mountproto=tcp after mountproto=udp, and so on
1828 static int nfs23_validate_mount_data(void *options
,
1829 struct nfs_parsed_mount_data
*args
,
1830 struct nfs_fh
*mntfh
,
1831 const char *dev_name
)
1833 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1834 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1839 args
->version
= NFS_DEFAULT_VERSION
;
1840 switch (data
->version
) {
1846 if (data
->flags
& NFS_MOUNT_VER3
)
1848 data
->root
.size
= NFS2_FHSIZE
;
1849 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1851 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1854 memset(data
->context
, 0, sizeof(data
->context
));
1856 if (data
->flags
& NFS_MOUNT_VER3
) {
1857 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1858 goto out_invalid_fh
;
1859 mntfh
->size
= data
->root
.size
;
1862 mntfh
->size
= NFS2_FHSIZE
;
1867 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1868 if (mntfh
->size
< sizeof(mntfh
->data
))
1869 memset(mntfh
->data
+ mntfh
->size
, 0,
1870 sizeof(mntfh
->data
) - mntfh
->size
);
1873 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1876 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1877 args
->flags
|= NFS_MOUNT_LEGACY_INTERFACE
;
1878 args
->rsize
= data
->rsize
;
1879 args
->wsize
= data
->wsize
;
1880 args
->timeo
= data
->timeo
;
1881 args
->retrans
= data
->retrans
;
1882 args
->acregmin
= data
->acregmin
;
1883 args
->acregmax
= data
->acregmax
;
1884 args
->acdirmin
= data
->acdirmin
;
1885 args
->acdirmax
= data
->acdirmax
;
1886 args
->need_mount
= false;
1888 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1889 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1890 args
->nfs_server
.port
= ntohs(data
->addr
.sin_port
);
1891 if (!nfs_verify_server_address(sap
))
1892 goto out_no_address
;
1894 if (!(data
->flags
& NFS_MOUNT_TCP
))
1895 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1896 /* N.B. caller will free nfs_server.hostname in all cases */
1897 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1898 args
->namlen
= data
->namlen
;
1899 args
->bsize
= data
->bsize
;
1901 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1902 args
->auth_flavors
[0] = data
->pseudoflavor
;
1903 if (!args
->nfs_server
.hostname
)
1906 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1907 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1908 NFS_MOUNT_LOCAL_FCNTL
);
1910 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1911 NFS_MOUNT_LOCAL_FCNTL
);
1913 * The legacy version 6 binary mount data from userspace has a
1914 * field used only to transport selinux information into the
1915 * the kernel. To continue to support that functionality we
1916 * have a touch of selinux knowledge here in the NFS code. The
1917 * userspace code converted context=blah to just blah so we are
1918 * converting back to the full string selinux understands.
1920 if (data
->context
[0]){
1921 #ifdef CONFIG_SECURITY_SELINUX
1923 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1926 strcpy(opts_str
, "context=");
1927 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1928 strcat(opts_str
, &data
->context
[0]);
1929 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1940 return NFS_TEXT_DATA
;
1943 #if !IS_ENABLED(CONFIG_NFS_V3)
1944 if (args
->version
== 3)
1945 goto out_v3_not_compiled
;
1946 #endif /* !CONFIG_NFS_V3 */
1951 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1955 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1960 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1963 #if !IS_ENABLED(CONFIG_NFS_V3)
1964 out_v3_not_compiled
:
1965 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1966 return -EPROTONOSUPPORT
;
1967 #endif /* !CONFIG_NFS_V3 */
1970 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1974 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1978 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1982 #if IS_ENABLED(CONFIG_NFS_V4)
1983 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1985 struct nfs_parsed_mount_data
*args
,
1986 struct nfs_fh
*mntfh
,
1987 const char *dev_name
)
1989 if (fs_type
== &nfs_fs_type
)
1990 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
1991 return nfs4_validate_mount_data(options
, args
, dev_name
);
1994 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
1996 struct nfs_parsed_mount_data
*args
,
1997 struct nfs_fh
*mntfh
,
1998 const char *dev_name
)
2000 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2004 static int nfs_validate_text_mount_data(void *options
,
2005 struct nfs_parsed_mount_data
*args
,
2006 const char *dev_name
)
2009 int max_namelen
= PAGE_SIZE
;
2010 int max_pathlen
= NFS_MAXPATHLEN
;
2011 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2013 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2016 if (!nfs_verify_server_address(sap
))
2017 goto out_no_address
;
2019 if (args
->version
== 4) {
2020 #if IS_ENABLED(CONFIG_NFS_V4)
2022 max_namelen
= NFS4_MAXNAMLEN
;
2023 max_pathlen
= NFS4_MAXPATHLEN
;
2024 nfs_validate_transport_protocol(args
);
2025 nfs4_validate_mount_flags(args
);
2027 goto out_v4_not_compiled
;
2028 #endif /* CONFIG_NFS_V4 */
2030 nfs_set_mount_transport_protocol(args
);
2032 nfs_set_port(sap
, &args
->nfs_server
.port
, port
);
2034 if (args
->auth_flavor_len
> 1)
2037 return nfs_parse_devname(dev_name
,
2038 &args
->nfs_server
.hostname
,
2040 &args
->nfs_server
.export_path
,
2043 #if !IS_ENABLED(CONFIG_NFS_V4)
2044 out_v4_not_compiled
:
2045 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2046 return -EPROTONOSUPPORT
;
2047 #endif /* !CONFIG_NFS_V4 */
2050 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2054 dfprintk(MOUNT
, "NFS: Too many RPC auth flavours specified\n");
2059 nfs_compare_remount_data(struct nfs_server
*nfss
,
2060 struct nfs_parsed_mount_data
*data
)
2062 if (data
->flags
!= nfss
->flags
||
2063 data
->rsize
!= nfss
->rsize
||
2064 data
->wsize
!= nfss
->wsize
||
2065 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
2066 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
2067 data
->acregmin
!= nfss
->acregmin
/ HZ
||
2068 data
->acregmax
!= nfss
->acregmax
/ HZ
||
2069 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
2070 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
2071 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
2072 data
->nfs_server
.port
!= nfss
->port
||
2073 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
2074 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
2075 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
2082 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
2085 struct nfs_server
*nfss
= sb
->s_fs_info
;
2086 struct nfs_parsed_mount_data
*data
;
2087 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
2088 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
2089 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
2092 * Userspace mount programs that send binary options generally send
2093 * them populated with default values. We have no way to know which
2094 * ones were explicitly specified. Fall back to legacy behavior and
2095 * just return success.
2097 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2098 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2099 options
->version
<= 6))))
2102 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2106 /* fill out struct with values from existing mount */
2107 data
->flags
= nfss
->flags
;
2108 data
->rsize
= nfss
->rsize
;
2109 data
->wsize
= nfss
->wsize
;
2110 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2111 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
2112 data
->acregmin
= nfss
->acregmin
/ HZ
;
2113 data
->acregmax
= nfss
->acregmax
/ HZ
;
2114 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2115 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2116 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2117 data
->nfs_server
.port
= nfss
->port
;
2118 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2119 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2120 data
->nfs_server
.addrlen
);
2122 /* overwrite those values with any that were specified */
2123 error
= nfs_parse_mount_options((char *)options
, data
);
2128 * noac is a special case. It implies -o sync, but that's not
2129 * necessarily reflected in the mtab options. do_remount_sb
2130 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2131 * remount options, so we have to explicitly reset it.
2133 if (data
->flags
& NFS_MOUNT_NOAC
)
2134 *flags
|= MS_SYNCHRONOUS
;
2136 /* compare new mount options with old ones */
2137 error
= nfs_compare_remount_data(nfss
, data
);
2142 EXPORT_SYMBOL_GPL(nfs_remount
);
2145 * Initialise the common bits of the superblock
2147 inline void nfs_initialise_sb(struct super_block
*sb
)
2149 struct nfs_server
*server
= NFS_SB(sb
);
2151 sb
->s_magic
= NFS_SUPER_MAGIC
;
2153 /* We probably want something more informative here */
2154 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2155 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2157 if (sb
->s_blocksize
== 0)
2158 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2159 &sb
->s_blocksize_bits
);
2161 sb
->s_bdi
= &server
->backing_dev_info
;
2163 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2167 * Finish setting up an NFS2/3 superblock
2169 void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2171 struct nfs_parsed_mount_data
*data
= mount_info
->parsed
;
2172 struct nfs_server
*server
= NFS_SB(sb
);
2174 sb
->s_blocksize_bits
= 0;
2175 sb
->s_blocksize
= 0;
2176 sb
->s_xattr
= server
->nfs_client
->cl_nfs_mod
->xattr
;
2177 sb
->s_op
= server
->nfs_client
->cl_nfs_mod
->sops
;
2178 if (data
&& data
->bsize
)
2179 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2181 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2182 /* The VFS shouldn't apply the umask to mode bits. We will do
2183 * so ourselves when necessary.
2185 sb
->s_flags
|= MS_POSIXACL
;
2186 sb
->s_time_gran
= 1;
2189 nfs_initialise_sb(sb
);
2191 EXPORT_SYMBOL_GPL(nfs_fill_super
);
2194 * Finish setting up a cloned NFS2/3/4 superblock
2196 void nfs_clone_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2198 const struct super_block
*old_sb
= mount_info
->cloned
->sb
;
2199 struct nfs_server
*server
= NFS_SB(sb
);
2201 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2202 sb
->s_blocksize
= old_sb
->s_blocksize
;
2203 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2204 sb
->s_xattr
= old_sb
->s_xattr
;
2205 sb
->s_op
= old_sb
->s_op
;
2206 sb
->s_time_gran
= 1;
2208 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2209 /* The VFS shouldn't apply the umask to mode bits. We will do
2210 * so ourselves when necessary.
2212 sb
->s_flags
|= MS_POSIXACL
;
2215 nfs_initialise_sb(sb
);
2218 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2220 const struct nfs_server
*a
= s
->s_fs_info
;
2221 const struct rpc_clnt
*clnt_a
= a
->client
;
2222 const struct rpc_clnt
*clnt_b
= b
->client
;
2224 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2226 if (a
->nfs_client
!= b
->nfs_client
)
2228 if (a
->flags
!= b
->flags
)
2230 if (a
->wsize
!= b
->wsize
)
2232 if (a
->rsize
!= b
->rsize
)
2234 if (a
->acregmin
!= b
->acregmin
)
2236 if (a
->acregmax
!= b
->acregmax
)
2238 if (a
->acdirmin
!= b
->acdirmin
)
2240 if (a
->acdirmax
!= b
->acdirmax
)
2242 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2249 struct nfs_sb_mountdata
{
2250 struct nfs_server
*server
;
2254 static int nfs_set_super(struct super_block
*s
, void *data
)
2256 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2257 struct nfs_server
*server
= sb_mntdata
->server
;
2260 s
->s_flags
= sb_mntdata
->mntflags
;
2261 s
->s_fs_info
= server
;
2262 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2263 ret
= set_anon_super(s
, server
);
2265 server
->s_dev
= s
->s_dev
;
2269 static int nfs_compare_super_address(struct nfs_server
*server1
,
2270 struct nfs_server
*server2
)
2272 struct sockaddr
*sap1
, *sap2
;
2274 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2275 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2277 if (sap1
->sa_family
!= sap2
->sa_family
)
2280 switch (sap1
->sa_family
) {
2282 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2283 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2284 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2286 if (sin1
->sin_port
!= sin2
->sin_port
)
2291 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2292 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2293 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2295 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2306 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2308 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2309 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2310 int mntflags
= sb_mntdata
->mntflags
;
2312 if (!nfs_compare_super_address(old
, server
))
2314 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2315 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2317 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2319 return nfs_compare_mount_options(sb
, server
, mntflags
);
2322 #ifdef CONFIG_NFS_FSCACHE
2323 static void nfs_get_cache_cookie(struct super_block
*sb
,
2324 struct nfs_parsed_mount_data
*parsed
,
2325 struct nfs_clone_mount
*cloned
)
2330 if (parsed
&& parsed
->fscache_uniq
) {
2331 uniq
= parsed
->fscache_uniq
;
2332 ulen
= strlen(parsed
->fscache_uniq
);
2333 } else if (cloned
) {
2334 struct nfs_server
*mnt_s
= NFS_SB(cloned
->sb
);
2335 if (mnt_s
->fscache_key
) {
2336 uniq
= mnt_s
->fscache_key
->key
.uniquifier
;
2337 ulen
= mnt_s
->fscache_key
->key
.uniq_len
;
2341 nfs_fscache_get_super_cookie(sb
, uniq
, ulen
);
2344 static void nfs_get_cache_cookie(struct super_block
*sb
,
2345 struct nfs_parsed_mount_data
*parsed
,
2346 struct nfs_clone_mount
*cloned
)
2351 static int nfs_bdi_register(struct nfs_server
*server
)
2353 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2356 int nfs_set_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2357 struct nfs_mount_info
*mount_info
)
2359 return security_sb_set_mnt_opts(s
, &mount_info
->parsed
->lsm_opts
);
2361 EXPORT_SYMBOL_GPL(nfs_set_sb_security
);
2363 int nfs_clone_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2364 struct nfs_mount_info
*mount_info
)
2366 /* clone any lsm security options from the parent to the new sb */
2367 security_sb_clone_mnt_opts(mount_info
->cloned
->sb
, s
);
2368 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
)
2372 EXPORT_SYMBOL_GPL(nfs_clone_sb_security
);
2374 struct dentry
*nfs_fs_mount_common(struct nfs_server
*server
,
2375 int flags
, const char *dev_name
,
2376 struct nfs_mount_info
*mount_info
,
2377 struct nfs_subversion
*nfs_mod
)
2379 struct super_block
*s
;
2380 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2381 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2382 struct nfs_sb_mountdata sb_mntdata
= {
2388 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2389 compare_super
= NULL
;
2391 /* -o noac implies -o sync */
2392 if (server
->flags
& NFS_MOUNT_NOAC
)
2393 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2395 /* Get a superblock - note that we may end up sharing one that already exists */
2396 s
= sget(nfs_mod
->nfs_fs
, compare_super
, nfs_set_super
, flags
, &sb_mntdata
);
2398 mntroot
= ERR_CAST(s
);
2402 if (s
->s_fs_info
!= server
) {
2403 nfs_free_server(server
);
2406 error
= nfs_bdi_register(server
);
2408 mntroot
= ERR_PTR(error
);
2409 goto error_splat_bdi
;
2414 /* initial superblock/root creation */
2415 mount_info
->fill_super(s
, mount_info
);
2416 nfs_get_cache_cookie(s
, mount_info
->parsed
, mount_info
->cloned
);
2419 mntroot
= nfs_get_root(s
, mount_info
->mntfh
, dev_name
);
2420 if (IS_ERR(mntroot
))
2421 goto error_splat_super
;
2423 error
= mount_info
->set_security(s
, mntroot
, mount_info
);
2425 goto error_splat_root
;
2427 s
->s_flags
|= MS_ACTIVE
;
2433 nfs_free_server(server
);
2438 mntroot
= ERR_PTR(error
);
2440 if (server
&& !s
->s_root
)
2441 bdi_unregister(&server
->backing_dev_info
);
2443 deactivate_locked_super(s
);
2446 EXPORT_SYMBOL_GPL(nfs_fs_mount_common
);
2448 struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2449 int flags
, const char *dev_name
, void *raw_data
)
2451 struct nfs_mount_info mount_info
= {
2452 .fill_super
= nfs_fill_super
,
2453 .set_security
= nfs_set_sb_security
,
2455 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2456 struct nfs_subversion
*nfs_mod
;
2459 mount_info
.parsed
= nfs_alloc_parsed_mount_data();
2460 mount_info
.mntfh
= nfs_alloc_fhandle();
2461 if (mount_info
.parsed
== NULL
|| mount_info
.mntfh
== NULL
)
2464 /* Validate the mount data */
2465 error
= nfs_validate_mount_data(fs_type
, raw_data
, mount_info
.parsed
, mount_info
.mntfh
, dev_name
);
2466 if (error
== NFS_TEXT_DATA
)
2467 error
= nfs_validate_text_mount_data(raw_data
, mount_info
.parsed
, dev_name
);
2469 mntroot
= ERR_PTR(error
);
2473 nfs_mod
= get_nfs_version(mount_info
.parsed
->version
);
2474 if (IS_ERR(nfs_mod
)) {
2475 mntroot
= ERR_CAST(nfs_mod
);
2479 mntroot
= nfs_mod
->rpc_ops
->try_mount(flags
, dev_name
, &mount_info
, nfs_mod
);
2481 put_nfs_version(nfs_mod
);
2483 nfs_free_parsed_mount_data(mount_info
.parsed
);
2484 nfs_free_fhandle(mount_info
.mntfh
);
2487 EXPORT_SYMBOL_GPL(nfs_fs_mount
);
2490 * Ensure that we unregister the bdi before kill_anon_super
2491 * releases the device name
2493 void nfs_put_super(struct super_block
*s
)
2495 struct nfs_server
*server
= NFS_SB(s
);
2497 bdi_unregister(&server
->backing_dev_info
);
2499 EXPORT_SYMBOL_GPL(nfs_put_super
);
2502 * Destroy an NFS2/3 superblock
2504 void nfs_kill_super(struct super_block
*s
)
2506 struct nfs_server
*server
= NFS_SB(s
);
2509 nfs_fscache_release_super_cookie(s
);
2510 nfs_free_server(server
);
2512 EXPORT_SYMBOL_GPL(nfs_kill_super
);
2515 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2517 static struct dentry
*
2518 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2519 const char *dev_name
, void *raw_data
)
2521 struct nfs_clone_mount
*data
= raw_data
;
2522 struct nfs_mount_info mount_info
= {
2523 .fill_super
= nfs_clone_super
,
2524 .set_security
= nfs_clone_sb_security
,
2527 struct nfs_server
*server
;
2528 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2529 struct nfs_subversion
*nfs_mod
= NFS_SB(data
->sb
)->nfs_client
->cl_nfs_mod
;
2532 dprintk("--> nfs_xdev_mount_common()\n");
2534 mount_info
.mntfh
= mount_info
.cloned
->fh
;
2536 /* create a new volume representation */
2537 server
= nfs_mod
->rpc_ops
->clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2538 if (IS_ERR(server
)) {
2539 error
= PTR_ERR(server
);
2543 mntroot
= nfs_fs_mount_common(server
, flags
, dev_name
, &mount_info
, nfs_mod
);
2544 dprintk("<-- nfs_xdev_mount_common() = 0\n");
2549 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error
);
2553 #if IS_ENABLED(CONFIG_NFS_V4)
2555 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2557 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2558 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2562 * Validate NFSv4 mount options
2564 static int nfs4_validate_mount_data(void *options
,
2565 struct nfs_parsed_mount_data
*args
,
2566 const char *dev_name
)
2568 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2569 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2577 switch (data
->version
) {
2579 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2580 goto out_no_address
;
2581 if (data
->host_addrlen
== 0)
2582 goto out_no_address
;
2583 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2584 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2586 if (!nfs_verify_server_address(sap
))
2587 goto out_no_address
;
2588 args
->nfs_server
.port
= ntohs(((struct sockaddr_in
*)sap
)->sin_port
);
2590 if (data
->auth_flavourlen
) {
2591 if (data
->auth_flavourlen
> 1)
2592 goto out_inval_auth
;
2593 if (copy_from_user(&args
->auth_flavors
[0],
2594 data
->auth_flavours
,
2595 sizeof(args
->auth_flavors
[0])))
2599 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2602 args
->nfs_server
.hostname
= c
;
2604 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2607 args
->nfs_server
.export_path
= c
;
2608 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2610 c
= strndup_user(data
->client_addr
.data
, 16);
2613 args
->client_address
= c
;
2616 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2620 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2621 args
->rsize
= data
->rsize
;
2622 args
->wsize
= data
->wsize
;
2623 args
->timeo
= data
->timeo
;
2624 args
->retrans
= data
->retrans
;
2625 args
->acregmin
= data
->acregmin
;
2626 args
->acregmax
= data
->acregmax
;
2627 args
->acdirmin
= data
->acdirmin
;
2628 args
->acdirmax
= data
->acdirmax
;
2629 args
->nfs_server
.protocol
= data
->proto
;
2630 nfs_validate_transport_protocol(args
);
2634 return NFS_TEXT_DATA
;
2640 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2644 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2645 data
->auth_flavourlen
);
2649 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2654 * NFS v4 module parameters need to stay in the
2655 * NFS client for backwards compatibility
2657 unsigned int nfs_callback_set_tcpport
;
2658 unsigned short nfs_callback_tcpport
;
2659 /* Default cache timeout is 10 minutes */
2660 unsigned int nfs_idmap_cache_timeout
= 600;
2661 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2662 bool nfs4_disable_idmapping
= true;
2663 unsigned short max_session_slots
= NFS4_DEF_SLOT_TABLE_SIZE
;
2664 unsigned short send_implementation_id
= 1;
2665 char nfs4_client_id_uniquifier
[NFS4_CLIENT_ID_UNIQ_LEN
] = "";
2667 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport
);
2668 EXPORT_SYMBOL_GPL(nfs_callback_tcpport
);
2669 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout
);
2670 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping
);
2671 EXPORT_SYMBOL_GPL(max_session_slots
);
2672 EXPORT_SYMBOL_GPL(send_implementation_id
);
2673 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier
);
2675 #define NFS_CALLBACK_MAXPORTNR (65535U)
2677 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2684 ret
= kstrtoul(val
, 0, &num
);
2685 if (ret
== -EINVAL
|| num
> NFS_CALLBACK_MAXPORTNR
)
2687 *((unsigned int *)kp
->arg
) = num
;
2690 static struct kernel_param_ops param_ops_portnr
= {
2691 .set
= param_set_portnr
,
2692 .get
= param_get_uint
,
2694 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2696 module_param_named(callback_tcpport
, nfs_callback_set_tcpport
, portnr
, 0644);
2697 module_param(nfs_idmap_cache_timeout
, int, 0644);
2698 module_param(nfs4_disable_idmapping
, bool, 0644);
2699 module_param_string(nfs4_unique_id
, nfs4_client_id_uniquifier
,
2700 NFS4_CLIENT_ID_UNIQ_LEN
, 0600);
2701 MODULE_PARM_DESC(nfs4_disable_idmapping
,
2702 "Turn off NFSv4 idmapping when using 'sec=sys'");
2703 module_param(max_session_slots
, ushort
, 0644);
2704 MODULE_PARM_DESC(max_session_slots
, "Maximum number of outstanding NFSv4.1 "
2705 "requests the client will negotiate");
2706 module_param(send_implementation_id
, ushort
, 0644);
2707 MODULE_PARM_DESC(send_implementation_id
,
2708 "Send implementation ID with NFSv4.1 exchange_id");
2709 MODULE_PARM_DESC(nfs4_unique_id
, "nfs_client_id4 uniquifier string");
2710 MODULE_ALIAS("nfs4");
2712 #endif /* CONFIG_NFS_V4 */