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/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
66 #include "nfs4session.h"
70 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_TEXT_DATA 1
73 #if IS_ENABLED(CONFIG_NFS_V3)
74 #define NFS_DEFAULT_VERSION 3
76 #define NFS_DEFAULT_VERSION 2
80 /* Mount options that take no arguments */
82 Opt_posix
, Opt_noposix
,
86 Opt_udp
, Opt_tcp
, Opt_rdma
,
88 Opt_rdirplus
, Opt_nordirplus
,
89 Opt_sharecache
, Opt_nosharecache
,
90 Opt_resvport
, Opt_noresvport
,
91 Opt_fscache
, Opt_nofscache
,
92 Opt_migration
, Opt_nomigration
,
94 /* Mount options that take integer arguments */
96 Opt_rsize
, Opt_wsize
, Opt_bsize
,
97 Opt_timeo
, Opt_retrans
,
98 Opt_acregmin
, Opt_acregmax
,
99 Opt_acdirmin
, Opt_acdirmax
,
106 /* Mount options that take string arguments */
108 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
109 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
114 /* Special mount options */
115 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
120 static const match_table_t nfs_mount_option_tokens
= {
121 { Opt_userspace
, "bg" },
122 { Opt_userspace
, "fg" },
123 { Opt_userspace
, "retry=%s" },
125 { Opt_sloppy
, "sloppy" },
127 { Opt_soft
, "soft" },
128 { Opt_hard
, "hard" },
129 { Opt_deprecated
, "intr" },
130 { Opt_deprecated
, "nointr" },
131 { Opt_posix
, "posix" },
132 { Opt_noposix
, "noposix" },
134 { Opt_nocto
, "nocto" },
136 { Opt_noac
, "noac" },
137 { Opt_lock
, "lock" },
138 { Opt_nolock
, "nolock" },
141 { Opt_rdma
, "rdma" },
143 { Opt_noacl
, "noacl" },
144 { Opt_rdirplus
, "rdirplus" },
145 { Opt_nordirplus
, "nordirplus" },
146 { Opt_sharecache
, "sharecache" },
147 { Opt_nosharecache
, "nosharecache" },
148 { Opt_resvport
, "resvport" },
149 { Opt_noresvport
, "noresvport" },
150 { Opt_fscache
, "fsc" },
151 { Opt_nofscache
, "nofsc" },
152 { Opt_migration
, "migration" },
153 { Opt_nomigration
, "nomigration" },
155 { Opt_port
, "port=%s" },
156 { Opt_rsize
, "rsize=%s" },
157 { Opt_wsize
, "wsize=%s" },
158 { Opt_bsize
, "bsize=%s" },
159 { Opt_timeo
, "timeo=%s" },
160 { Opt_retrans
, "retrans=%s" },
161 { Opt_acregmin
, "acregmin=%s" },
162 { Opt_acregmax
, "acregmax=%s" },
163 { Opt_acdirmin
, "acdirmin=%s" },
164 { Opt_acdirmax
, "acdirmax=%s" },
165 { Opt_actimeo
, "actimeo=%s" },
166 { Opt_namelen
, "namlen=%s" },
167 { Opt_mountport
, "mountport=%s" },
168 { Opt_mountvers
, "mountvers=%s" },
169 { Opt_minorversion
, "minorversion=%s" },
171 { Opt_nfsvers
, "nfsvers=%s" },
172 { Opt_nfsvers
, "vers=%s" },
174 { Opt_sec
, "sec=%s" },
175 { Opt_proto
, "proto=%s" },
176 { Opt_mountproto
, "mountproto=%s" },
177 { Opt_addr
, "addr=%s" },
178 { Opt_clientaddr
, "clientaddr=%s" },
179 { Opt_mounthost
, "mounthost=%s" },
180 { Opt_mountaddr
, "mountaddr=%s" },
182 { Opt_lookupcache
, "lookupcache=%s" },
183 { Opt_fscache_uniq
, "fsc=%s" },
184 { Opt_local_lock
, "local_lock=%s" },
186 /* The following needs to be listed after all other options */
187 { Opt_nfsvers
, "v%s" },
193 Opt_xprt_udp
, Opt_xprt_udp6
, Opt_xprt_tcp
, Opt_xprt_tcp6
, Opt_xprt_rdma
,
198 static const match_table_t nfs_xprt_protocol_tokens
= {
199 { Opt_xprt_udp
, "udp" },
200 { Opt_xprt_udp6
, "udp6" },
201 { Opt_xprt_tcp
, "tcp" },
202 { Opt_xprt_tcp6
, "tcp6" },
203 { Opt_xprt_rdma
, "rdma" },
205 { Opt_xprt_err
, NULL
}
209 Opt_sec_none
, Opt_sec_sys
,
210 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
211 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
212 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
217 static const match_table_t nfs_secflavor_tokens
= {
218 { Opt_sec_none
, "none" },
219 { Opt_sec_none
, "null" },
220 { Opt_sec_sys
, "sys" },
222 { Opt_sec_krb5
, "krb5" },
223 { Opt_sec_krb5i
, "krb5i" },
224 { Opt_sec_krb5p
, "krb5p" },
226 { Opt_sec_lkey
, "lkey" },
227 { Opt_sec_lkeyi
, "lkeyi" },
228 { Opt_sec_lkeyp
, "lkeyp" },
230 { Opt_sec_spkm
, "spkm3" },
231 { Opt_sec_spkmi
, "spkm3i" },
232 { Opt_sec_spkmp
, "spkm3p" },
234 { Opt_sec_err
, NULL
}
238 Opt_lookupcache_all
, Opt_lookupcache_positive
,
239 Opt_lookupcache_none
,
244 static match_table_t nfs_lookupcache_tokens
= {
245 { Opt_lookupcache_all
, "all" },
246 { Opt_lookupcache_positive
, "pos" },
247 { Opt_lookupcache_positive
, "positive" },
248 { Opt_lookupcache_none
, "none" },
250 { Opt_lookupcache_err
, NULL
}
254 Opt_local_lock_all
, Opt_local_lock_flock
, Opt_local_lock_posix
,
260 static match_table_t nfs_local_lock_tokens
= {
261 { Opt_local_lock_all
, "all" },
262 { Opt_local_lock_flock
, "flock" },
263 { Opt_local_lock_posix
, "posix" },
264 { Opt_local_lock_none
, "none" },
266 { Opt_local_lock_err
, NULL
}
270 Opt_vers_2
, Opt_vers_3
, Opt_vers_4
, Opt_vers_4_0
,
271 Opt_vers_4_1
, Opt_vers_4_2
,
276 static match_table_t nfs_vers_tokens
= {
280 { Opt_vers_4_0
, "4.0" },
281 { Opt_vers_4_1
, "4.1" },
282 { Opt_vers_4_2
, "4.2" },
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 MODULE_ALIAS_FS("nfs");
298 EXPORT_SYMBOL_GPL(nfs_fs_type
);
300 struct file_system_type nfs_xdev_fs_type
= {
301 .owner
= THIS_MODULE
,
303 .mount
= nfs_xdev_mount
,
304 .kill_sb
= nfs_kill_super
,
305 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_BINARY_MOUNTDATA
,
308 const struct super_operations nfs_sops
= {
309 .alloc_inode
= nfs_alloc_inode
,
310 .destroy_inode
= nfs_destroy_inode
,
311 .write_inode
= nfs_write_inode
,
312 .drop_inode
= nfs_drop_inode
,
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 MODULE_ALIAS_FS("nfs4");
337 MODULE_ALIAS("nfs4");
338 EXPORT_SYMBOL_GPL(nfs4_fs_type
);
340 static int __init
register_nfs4_fs(void)
342 return register_filesystem(&nfs4_fs_type
);
345 static void unregister_nfs4_fs(void)
347 unregister_filesystem(&nfs4_fs_type
);
350 static int __init
register_nfs4_fs(void)
355 static void unregister_nfs4_fs(void)
360 static struct shrinker acl_shrinker
= {
361 .count_objects
= nfs_access_cache_count
,
362 .scan_objects
= nfs_access_cache_scan
,
363 .seeks
= DEFAULT_SEEKS
,
367 * Register the NFS filesystems
369 int __init
register_nfs_fs(void)
373 ret
= register_filesystem(&nfs_fs_type
);
377 ret
= register_nfs4_fs();
381 ret
= nfs_register_sysctl();
384 ret
= register_shrinker(&acl_shrinker
);
389 nfs_unregister_sysctl();
391 unregister_nfs4_fs();
393 unregister_filesystem(&nfs_fs_type
);
399 * Unregister the NFS filesystems
401 void __exit
unregister_nfs_fs(void)
403 unregister_shrinker(&acl_shrinker
);
404 nfs_unregister_sysctl();
405 unregister_nfs4_fs();
406 unregister_filesystem(&nfs_fs_type
);
409 bool nfs_sb_active(struct super_block
*sb
)
411 struct nfs_server
*server
= NFS_SB(sb
);
413 if (!atomic_inc_not_zero(&sb
->s_active
))
415 if (atomic_inc_return(&server
->active
) != 1)
416 atomic_dec(&sb
->s_active
);
419 EXPORT_SYMBOL_GPL(nfs_sb_active
);
421 void nfs_sb_deactive(struct super_block
*sb
)
423 struct nfs_server
*server
= NFS_SB(sb
);
425 if (atomic_dec_and_test(&server
->active
))
426 deactivate_super(sb
);
428 EXPORT_SYMBOL_GPL(nfs_sb_deactive
);
431 * Deliver file system statistics to userspace
433 int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
435 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
436 unsigned char blockbits
;
437 unsigned long blockres
;
438 struct nfs_fh
*fh
= NFS_FH(d_inode(dentry
));
439 struct nfs_fsstat res
;
442 res
.fattr
= nfs_alloc_fattr();
443 if (res
.fattr
== NULL
)
446 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
447 if (unlikely(error
== -ESTALE
)) {
448 struct dentry
*pd_dentry
;
450 pd_dentry
= dget_parent(dentry
);
451 if (pd_dentry
!= NULL
) {
452 nfs_zap_caches(d_inode(pd_dentry
));
456 nfs_free_fattr(res
.fattr
);
460 buf
->f_type
= NFS_SUPER_MAGIC
;
463 * Current versions of glibc do not correctly handle the
464 * case where f_frsize != f_bsize. Eventually we want to
465 * report the value of wtmult in this field.
467 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
470 * On most *nix systems, f_blocks, f_bfree, and f_bavail
471 * are reported in units of f_frsize. Linux hasn't had
472 * an f_frsize field in its statfs struct until recently,
473 * thus historically Linux's sys_statfs reports these
474 * fields in units of f_bsize.
476 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
477 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
478 blockres
= (1 << blockbits
) - 1;
479 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
480 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
481 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
483 buf
->f_files
= res
.tfiles
;
484 buf
->f_ffree
= res
.afiles
;
486 buf
->f_namelen
= server
->namelen
;
491 dprintk("%s: statfs error = %d\n", __func__
, -error
);
494 EXPORT_SYMBOL_GPL(nfs_statfs
);
497 * Map the security flavour number to a name
499 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
501 static const struct {
502 rpc_authflavor_t flavour
;
504 } sec_flavours
[NFS_AUTH_INFO_MAX_FLAVORS
] = {
505 /* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */
506 { RPC_AUTH_NULL
, "null" },
507 { RPC_AUTH_UNIX
, "sys" },
508 { RPC_AUTH_GSS_KRB5
, "krb5" },
509 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
510 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
511 { RPC_AUTH_GSS_LKEY
, "lkey" },
512 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
513 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
514 { RPC_AUTH_GSS_SPKM
, "spkm" },
515 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
516 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
517 { UINT_MAX
, "unknown" }
521 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
522 if (sec_flavours
[i
].flavour
== flavour
)
525 return sec_flavours
[i
].str
;
528 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
531 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
533 seq_printf(m
, ",mountproto=");
534 switch (sap
->sa_family
) {
536 switch (nfss
->mountd_protocol
) {
538 seq_printf(m
, RPCBIND_NETID_UDP
);
541 seq_printf(m
, RPCBIND_NETID_TCP
);
545 seq_printf(m
, "auto");
549 switch (nfss
->mountd_protocol
) {
551 seq_printf(m
, RPCBIND_NETID_UDP6
);
554 seq_printf(m
, RPCBIND_NETID_TCP6
);
558 seq_printf(m
, "auto");
563 seq_printf(m
, "auto");
567 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
570 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
572 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
575 switch (sap
->sa_family
) {
577 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
578 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
582 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
583 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
588 seq_printf(m
, ",mountaddr=unspecified");
591 if (nfss
->mountd_version
|| showdefaults
)
592 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
593 if ((nfss
->mountd_port
&&
594 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
596 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
598 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
601 #if IS_ENABLED(CONFIG_NFS_V4)
602 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
605 struct nfs_client
*clp
= nfss
->nfs_client
;
607 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
610 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
616 static void nfs_show_nfs_version(struct seq_file
*m
,
617 unsigned int version
,
618 unsigned int minorversion
)
620 seq_printf(m
, ",vers=%u", version
);
622 seq_printf(m
, ".%u", minorversion
);
626 * Describe the mount options in force on this server representation
628 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
631 static const struct proc_nfs_info
{
636 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
637 { NFS_MOUNT_POSIX
, ",posix", "" },
638 { NFS_MOUNT_NOCTO
, ",nocto", "" },
639 { NFS_MOUNT_NOAC
, ",noac", "" },
640 { NFS_MOUNT_NONLM
, ",nolock", "" },
641 { NFS_MOUNT_NOACL
, ",noacl", "" },
642 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
643 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
644 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
647 const struct proc_nfs_info
*nfs_infop
;
648 struct nfs_client
*clp
= nfss
->nfs_client
;
649 u32 version
= clp
->rpc_ops
->version
;
650 int local_flock
, local_fcntl
;
652 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
653 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
654 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
655 if (nfss
->bsize
!= 0)
656 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
657 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
658 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
659 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
660 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
661 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
662 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
663 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
664 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
665 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
666 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
667 if (nfss
->flags
& nfs_infop
->flag
)
668 seq_puts(m
, nfs_infop
->str
);
670 seq_puts(m
, nfs_infop
->nostr
);
673 seq_printf(m
, ",proto=%s",
674 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
677 if (nfss
->port
!= NFS_PORT
)
678 seq_printf(m
, ",port=%u", nfss
->port
);
681 seq_printf(m
, ",port=%u", nfss
->port
);
683 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
684 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
685 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
688 nfs_show_mountd_options(m
, nfss
, showdefaults
);
690 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
692 if (nfss
->options
& NFS_OPTION_FSCACHE
)
693 seq_printf(m
, ",fsc");
695 if (nfss
->options
& NFS_OPTION_MIGRATION
)
696 seq_printf(m
, ",migration");
698 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
699 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
700 seq_printf(m
, ",lookupcache=none");
702 seq_printf(m
, ",lookupcache=pos");
705 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
706 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
708 if (!local_flock
&& !local_fcntl
)
709 seq_printf(m
, ",local_lock=none");
710 else if (local_flock
&& local_fcntl
)
711 seq_printf(m
, ",local_lock=all");
712 else if (local_flock
)
713 seq_printf(m
, ",local_lock=flock");
715 seq_printf(m
, ",local_lock=posix");
719 * Describe the mount options on this VFS mountpoint
721 int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
723 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
725 nfs_show_mount_options(m
, nfss
, 0);
728 seq_printf(m
, ",addr=%s",
729 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
735 EXPORT_SYMBOL_GPL(nfs_show_options
);
737 #if IS_ENABLED(CONFIG_NFS_V4)
738 #ifdef CONFIG_NFS_V4_1
739 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
741 if (nfs4_has_session(server
->nfs_client
))
742 seq_printf(m
, ",sessions");
745 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
749 #ifdef CONFIG_NFS_V4_1
750 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
752 seq_printf(m
, ",pnfs=");
753 if (server
->pnfs_curr_ld
)
754 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
756 seq_printf(m
, "not configured");
759 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
761 if (nfss
->nfs_client
&& nfss
->nfs_client
->cl_implid
) {
762 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->cl_implid
;
763 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
765 impl_id
->name
, impl_id
->domain
,
766 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
770 #if IS_ENABLED(CONFIG_NFS_V4)
771 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
775 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
780 int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
782 char *page
= (char *) __get_free_page(GFP_KERNEL
);
783 char *devname
, *dummy
;
787 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
, 0);
789 err
= PTR_ERR(devname
);
791 seq_escape(m
, devname
, " \t\n\\");
792 free_page((unsigned long)page
);
795 EXPORT_SYMBOL_GPL(nfs_show_devname
);
797 int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
802 EXPORT_SYMBOL_GPL(nfs_show_path
);
805 * Present statistical information for this VFS mountpoint
807 int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
810 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
811 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
812 struct nfs_iostats totals
= { };
814 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
817 * Display all mount option settings
819 seq_printf(m
, "\n\topts:\t");
820 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
821 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
822 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
823 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
824 nfs_show_mount_options(m
, nfss
, 1);
826 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
828 show_implementation_id(m
, nfss
);
830 seq_printf(m
, "\n\tcaps:\t");
831 seq_printf(m
, "caps=0x%x", nfss
->caps
);
832 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
833 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
834 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
835 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
837 #if IS_ENABLED(CONFIG_NFS_V4)
838 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
839 seq_printf(m
, "\n\tnfsv4:\t");
840 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
841 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
842 seq_printf(m
, ",bm2=0x%x", nfss
->attr_bitmask
[2]);
843 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
844 show_sessions(m
, nfss
);
850 * Display security flavor in effect for this mount
852 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
854 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
857 * Display superblock I/O counters
859 for_each_possible_cpu(cpu
) {
860 struct nfs_iostats
*stats
;
863 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
865 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
866 totals
.events
[i
] += stats
->events
[i
];
867 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
868 totals
.bytes
[i
] += stats
->bytes
[i
];
869 #ifdef CONFIG_NFS_FSCACHE
870 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
871 totals
.fscache
[i
] += stats
->fscache
[i
];
877 seq_printf(m
, "\n\tevents:\t");
878 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
879 seq_printf(m
, "%lu ", totals
.events
[i
]);
880 seq_printf(m
, "\n\tbytes:\t");
881 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
882 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
883 #ifdef CONFIG_NFS_FSCACHE
884 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
885 seq_printf(m
, "\n\tfsc:\t");
886 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
887 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
892 rpc_print_iostats(m
, nfss
->client
);
896 EXPORT_SYMBOL_GPL(nfs_show_stats
);
899 * Begin unmount by attempting to remove all automounted mountpoints we added
900 * in response to xdev traversals and referrals
902 void nfs_umount_begin(struct super_block
*sb
)
904 struct nfs_server
*server
;
905 struct rpc_clnt
*rpc
;
908 /* -EIO all pending I/O */
909 rpc
= server
->client_acl
;
911 rpc_killall_tasks(rpc
);
912 rpc
= server
->client
;
914 rpc_killall_tasks(rpc
);
916 EXPORT_SYMBOL_GPL(nfs_umount_begin
);
918 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(void)
920 struct nfs_parsed_mount_data
*data
;
922 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
924 data
->acregmin
= NFS_DEF_ACREGMIN
;
925 data
->acregmax
= NFS_DEF_ACREGMAX
;
926 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
927 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
928 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
929 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
930 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
931 data
->selected_flavor
= RPC_AUTH_MAXFLAVOR
;
932 data
->minorversion
= 0;
933 data
->need_mount
= true;
934 data
->net
= current
->nsproxy
->net_ns
;
935 security_init_mnt_opts(&data
->lsm_opts
);
940 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data
*data
)
943 kfree(data
->client_address
);
944 kfree(data
->mount_server
.hostname
);
945 kfree(data
->nfs_server
.export_path
);
946 kfree(data
->nfs_server
.hostname
);
947 kfree(data
->fscache_uniq
);
948 security_free_mnt_opts(&data
->lsm_opts
);
954 * Sanity-check a server address provided by the mount command.
956 * Address family must be initialized, and address must not be
957 * the ANY address for that family.
959 static int nfs_verify_server_address(struct sockaddr
*addr
)
961 switch (addr
->sa_family
) {
963 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
964 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
967 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
968 return !ipv6_addr_any(sa
);
972 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
977 * Select between a default port value and a user-specified port value.
978 * If a zero value is set, then autobind will be used.
980 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
981 const unsigned short default_port
)
983 if (*port
== NFS_UNSPEC_PORT
)
984 *port
= default_port
;
986 rpc_set_port(sap
, *port
);
990 * Sanity check the NFS transport protocol.
993 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
995 switch (mnt
->nfs_server
.protocol
) {
996 case XPRT_TRANSPORT_UDP
:
997 case XPRT_TRANSPORT_TCP
:
998 case XPRT_TRANSPORT_RDMA
:
1001 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1006 * For text based NFSv2/v3 mounts, the mount protocol transport default
1007 * settings should depend upon the specified NFS transport.
1009 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
1011 nfs_validate_transport_protocol(mnt
);
1013 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
1014 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
1016 switch (mnt
->nfs_server
.protocol
) {
1017 case XPRT_TRANSPORT_UDP
:
1018 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1020 case XPRT_TRANSPORT_TCP
:
1021 case XPRT_TRANSPORT_RDMA
:
1022 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1027 * Add 'flavor' to 'auth_info' if not already present.
1028 * Returns true if 'flavor' ends up in the list, false otherwise
1030 static bool nfs_auth_info_add(struct nfs_auth_info
*auth_info
,
1031 rpc_authflavor_t flavor
)
1034 unsigned int max_flavor_len
= ARRAY_SIZE(auth_info
->flavors
);
1036 /* make sure this flavor isn't already in the list */
1037 for (i
= 0; i
< auth_info
->flavor_len
; i
++) {
1038 if (flavor
== auth_info
->flavors
[i
])
1042 if (auth_info
->flavor_len
+ 1 >= max_flavor_len
) {
1043 dfprintk(MOUNT
, "NFS: too many sec= flavors\n");
1047 auth_info
->flavors
[auth_info
->flavor_len
++] = flavor
;
1052 * Return true if 'match' is in auth_info or auth_info is empty.
1053 * Return false otherwise.
1055 bool nfs_auth_info_match(const struct nfs_auth_info
*auth_info
,
1056 rpc_authflavor_t match
)
1060 if (!auth_info
->flavor_len
)
1063 for (i
= 0; i
< auth_info
->flavor_len
; i
++) {
1064 if (auth_info
->flavors
[i
] == match
)
1069 EXPORT_SYMBOL_GPL(nfs_auth_info_match
);
1072 * Parse the value of the 'sec=' option.
1074 static int nfs_parse_security_flavors(char *value
,
1075 struct nfs_parsed_mount_data
*mnt
)
1077 substring_t args
[MAX_OPT_ARGS
];
1078 rpc_authflavor_t pseudoflavor
;
1081 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1083 while ((p
= strsep(&value
, ":")) != NULL
) {
1084 switch (match_token(p
, nfs_secflavor_tokens
, args
)) {
1086 pseudoflavor
= RPC_AUTH_NULL
;
1089 pseudoflavor
= RPC_AUTH_UNIX
;
1092 pseudoflavor
= RPC_AUTH_GSS_KRB5
;
1095 pseudoflavor
= RPC_AUTH_GSS_KRB5I
;
1098 pseudoflavor
= RPC_AUTH_GSS_KRB5P
;
1101 pseudoflavor
= RPC_AUTH_GSS_LKEY
;
1104 pseudoflavor
= RPC_AUTH_GSS_LKEYI
;
1107 pseudoflavor
= RPC_AUTH_GSS_LKEYP
;
1110 pseudoflavor
= RPC_AUTH_GSS_SPKM
;
1113 pseudoflavor
= RPC_AUTH_GSS_SPKMI
;
1116 pseudoflavor
= RPC_AUTH_GSS_SPKMP
;
1120 "NFS: sec= option '%s' not recognized\n", p
);
1124 if (!nfs_auth_info_add(&mnt
->auth_info
, pseudoflavor
))
1131 static int nfs_parse_version_string(char *string
,
1132 struct nfs_parsed_mount_data
*mnt
,
1135 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1136 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1141 mnt
->flags
|= NFS_MOUNT_VER3
;
1145 /* Backward compatibility option. In future,
1146 * the mount program should always supply
1147 * a NFSv4 minor version number.
1153 mnt
->minorversion
= 0;
1157 mnt
->minorversion
= 1;
1161 mnt
->minorversion
= 2;
1169 static int nfs_get_option_str(substring_t args
[], char **option
)
1172 *option
= match_strdup(args
);
1176 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1181 string
= match_strdup(args
);
1184 rc
= kstrtoul(string
, 10, option
);
1191 * Error-check and convert a string of mount options from user space into
1192 * a data structure. The whole mount string is processed; bad options are
1193 * skipped as they are encountered. If there were no errors, return 1;
1194 * otherwise return 0 (zero).
1196 static int nfs_parse_mount_options(char *raw
,
1197 struct nfs_parsed_mount_data
*mnt
)
1199 char *p
, *string
, *secdata
;
1200 int rc
, sloppy
= 0, invalid_option
= 0;
1201 unsigned short protofamily
= AF_UNSPEC
;
1202 unsigned short mountfamily
= AF_UNSPEC
;
1205 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1208 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1210 secdata
= alloc_secdata();
1214 rc
= security_sb_copy_data(raw
, secdata
);
1216 goto out_security_failure
;
1218 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1220 goto out_security_failure
;
1222 free_secdata(secdata
);
1224 while ((p
= strsep(&raw
, ",")) != NULL
) {
1225 substring_t args
[MAX_OPT_ARGS
];
1226 unsigned long option
;
1232 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1234 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1238 * boolean options: foo/nofoo
1241 mnt
->flags
|= NFS_MOUNT_SOFT
;
1244 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1247 mnt
->flags
|= NFS_MOUNT_POSIX
;
1250 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1253 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1256 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1259 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1262 mnt
->flags
|= NFS_MOUNT_NOAC
;
1265 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1266 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1267 NFS_MOUNT_LOCAL_FCNTL
);
1270 mnt
->flags
|= NFS_MOUNT_NONLM
;
1271 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1272 NFS_MOUNT_LOCAL_FCNTL
);
1275 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1276 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1279 mnt
->flags
|= NFS_MOUNT_TCP
;
1280 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1283 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1284 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1285 xprt_load_transport(p
);
1288 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1291 mnt
->flags
|= NFS_MOUNT_NOACL
;
1294 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1296 case Opt_nordirplus
:
1297 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1299 case Opt_sharecache
:
1300 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1302 case Opt_nosharecache
:
1303 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1306 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1308 case Opt_noresvport
:
1309 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1312 mnt
->options
|= NFS_OPTION_FSCACHE
;
1313 kfree(mnt
->fscache_uniq
);
1314 mnt
->fscache_uniq
= NULL
;
1317 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1318 kfree(mnt
->fscache_uniq
);
1319 mnt
->fscache_uniq
= NULL
;
1322 mnt
->options
|= NFS_OPTION_MIGRATION
;
1324 case Opt_nomigration
:
1325 mnt
->options
&= ~NFS_OPTION_MIGRATION
;
1329 * options that take numeric values
1332 if (nfs_get_option_ul(args
, &option
) ||
1334 goto out_invalid_value
;
1335 mnt
->nfs_server
.port
= option
;
1338 if (nfs_get_option_ul(args
, &option
))
1339 goto out_invalid_value
;
1340 mnt
->rsize
= option
;
1343 if (nfs_get_option_ul(args
, &option
))
1344 goto out_invalid_value
;
1345 mnt
->wsize
= option
;
1348 if (nfs_get_option_ul(args
, &option
))
1349 goto out_invalid_value
;
1350 mnt
->bsize
= option
;
1353 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1354 goto out_invalid_value
;
1355 mnt
->timeo
= option
;
1358 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1359 goto out_invalid_value
;
1360 mnt
->retrans
= option
;
1363 if (nfs_get_option_ul(args
, &option
))
1364 goto out_invalid_value
;
1365 mnt
->acregmin
= option
;
1368 if (nfs_get_option_ul(args
, &option
))
1369 goto out_invalid_value
;
1370 mnt
->acregmax
= option
;
1373 if (nfs_get_option_ul(args
, &option
))
1374 goto out_invalid_value
;
1375 mnt
->acdirmin
= option
;
1378 if (nfs_get_option_ul(args
, &option
))
1379 goto out_invalid_value
;
1380 mnt
->acdirmax
= option
;
1383 if (nfs_get_option_ul(args
, &option
))
1384 goto out_invalid_value
;
1385 mnt
->acregmin
= mnt
->acregmax
=
1386 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1389 if (nfs_get_option_ul(args
, &option
))
1390 goto out_invalid_value
;
1391 mnt
->namlen
= option
;
1394 if (nfs_get_option_ul(args
, &option
) ||
1396 goto out_invalid_value
;
1397 mnt
->mount_server
.port
= option
;
1400 if (nfs_get_option_ul(args
, &option
) ||
1401 option
< NFS_MNT_VERSION
||
1402 option
> NFS_MNT3_VERSION
)
1403 goto out_invalid_value
;
1404 mnt
->mount_server
.version
= option
;
1406 case Opt_minorversion
:
1407 if (nfs_get_option_ul(args
, &option
))
1408 goto out_invalid_value
;
1409 if (option
> NFS4_MAX_MINOR_VERSION
)
1410 goto out_invalid_value
;
1411 mnt
->minorversion
= option
;
1415 * options that take text values
1418 string
= match_strdup(args
);
1421 rc
= nfs_parse_version_string(string
, mnt
, args
);
1424 goto out_invalid_value
;
1427 string
= match_strdup(args
);
1430 rc
= nfs_parse_security_flavors(string
, mnt
);
1433 dfprintk(MOUNT
, "NFS: unrecognized "
1434 "security flavor\n");
1439 string
= match_strdup(args
);
1442 token
= match_token(string
,
1443 nfs_xprt_protocol_tokens
, args
);
1445 protofamily
= AF_INET
;
1448 protofamily
= AF_INET6
;
1450 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1451 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1454 protofamily
= AF_INET6
;
1456 mnt
->flags
|= NFS_MOUNT_TCP
;
1457 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1460 /* vector side protocols to TCP */
1461 mnt
->flags
|= NFS_MOUNT_TCP
;
1462 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1463 xprt_load_transport(string
);
1466 dfprintk(MOUNT
, "NFS: unrecognized "
1467 "transport protocol\n");
1473 case Opt_mountproto
:
1474 string
= match_strdup(args
);
1477 token
= match_token(string
,
1478 nfs_xprt_protocol_tokens
, args
);
1481 mountfamily
= AF_INET
;
1484 mountfamily
= AF_INET6
;
1486 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1489 mountfamily
= AF_INET6
;
1491 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1493 case Opt_xprt_rdma
: /* not used for side protocols */
1495 dfprintk(MOUNT
, "NFS: unrecognized "
1496 "transport protocol\n");
1501 string
= match_strdup(args
);
1504 mnt
->nfs_server
.addrlen
=
1505 rpc_pton(mnt
->net
, string
, strlen(string
),
1507 &mnt
->nfs_server
.address
,
1508 sizeof(mnt
->nfs_server
.address
));
1510 if (mnt
->nfs_server
.addrlen
== 0)
1511 goto out_invalid_address
;
1513 case Opt_clientaddr
:
1514 if (nfs_get_option_str(args
, &mnt
->client_address
))
1518 if (nfs_get_option_str(args
,
1519 &mnt
->mount_server
.hostname
))
1523 string
= match_strdup(args
);
1526 mnt
->mount_server
.addrlen
=
1527 rpc_pton(mnt
->net
, string
, strlen(string
),
1529 &mnt
->mount_server
.address
,
1530 sizeof(mnt
->mount_server
.address
));
1532 if (mnt
->mount_server
.addrlen
== 0)
1533 goto out_invalid_address
;
1535 case Opt_lookupcache
:
1536 string
= match_strdup(args
);
1539 token
= match_token(string
,
1540 nfs_lookupcache_tokens
, args
);
1543 case Opt_lookupcache_all
:
1544 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1546 case Opt_lookupcache_positive
:
1547 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1548 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1550 case Opt_lookupcache_none
:
1551 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1554 dfprintk(MOUNT
, "NFS: invalid "
1555 "lookupcache argument\n");
1559 case Opt_fscache_uniq
:
1560 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1562 mnt
->options
|= NFS_OPTION_FSCACHE
;
1564 case Opt_local_lock
:
1565 string
= match_strdup(args
);
1568 token
= match_token(string
, nfs_local_lock_tokens
,
1572 case Opt_local_lock_all
:
1573 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1574 NFS_MOUNT_LOCAL_FCNTL
);
1576 case Opt_local_lock_flock
:
1577 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1579 case Opt_local_lock_posix
:
1580 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1582 case Opt_local_lock_none
:
1583 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1584 NFS_MOUNT_LOCAL_FCNTL
);
1587 dfprintk(MOUNT
, "NFS: invalid "
1588 "local_lock argument\n");
1598 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1601 case Opt_deprecated
:
1602 dfprintk(MOUNT
, "NFS: ignoring mount option "
1608 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1613 if (!sloppy
&& invalid_option
)
1616 if (mnt
->minorversion
&& mnt
->version
!= 4)
1617 goto out_minorversion_mismatch
;
1619 if (mnt
->options
& NFS_OPTION_MIGRATION
&&
1620 (mnt
->version
!= 4 || mnt
->minorversion
!= 0))
1621 goto out_migration_misuse
;
1624 * verify that any proto=/mountproto= options match the address
1625 * families in the addr=/mountaddr= options.
1627 if (protofamily
!= AF_UNSPEC
&&
1628 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1629 goto out_proto_mismatch
;
1631 if (mountfamily
!= AF_UNSPEC
) {
1632 if (mnt
->mount_server
.addrlen
) {
1633 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1634 goto out_mountproto_mismatch
;
1636 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1637 goto out_mountproto_mismatch
;
1643 out_mountproto_mismatch
:
1644 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1648 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1650 out_invalid_address
:
1651 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1654 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1656 out_minorversion_mismatch
:
1657 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1658 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1660 out_migration_misuse
:
1662 "NFS: 'migration' not supported for this NFS version\n");
1665 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1667 out_security_failure
:
1668 free_secdata(secdata
);
1669 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1674 * Ensure that a specified authtype in args->auth_info is supported by
1675 * the server. Returns 0 and sets args->selected_flavor if it's ok, and
1678 static int nfs_verify_authflavors(struct nfs_parsed_mount_data
*args
,
1679 rpc_authflavor_t
*server_authlist
, unsigned int count
)
1681 rpc_authflavor_t flavor
= RPC_AUTH_MAXFLAVOR
;
1685 * If the sec= mount option is used, the specified flavor or AUTH_NULL
1686 * must be in the list returned by the server.
1688 * AUTH_NULL has a special meaning when it's in the server list - it
1689 * means that the server will ignore the rpc creds, so any flavor
1692 for (i
= 0; i
< count
; i
++) {
1693 flavor
= server_authlist
[i
];
1695 if (nfs_auth_info_match(&args
->auth_info
, flavor
) ||
1696 flavor
== RPC_AUTH_NULL
)
1701 "NFS: specified auth flavors not supported by server\n");
1705 args
->selected_flavor
= flavor
;
1706 dfprintk(MOUNT
, "NFS: using auth flavor %u\n", args
->selected_flavor
);
1711 * Use the remote server's MOUNT service to request the NFS file handle
1712 * corresponding to the provided path.
1714 static int nfs_request_mount(struct nfs_parsed_mount_data
*args
,
1715 struct nfs_fh
*root_fh
,
1716 rpc_authflavor_t
*server_authlist
,
1717 unsigned int *server_authlist_len
)
1719 struct nfs_mount_request request
= {
1720 .sap
= (struct sockaddr
*)
1721 &args
->mount_server
.address
,
1722 .dirpath
= args
->nfs_server
.export_path
,
1723 .protocol
= args
->mount_server
.protocol
,
1725 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1726 .auth_flav_len
= server_authlist_len
,
1727 .auth_flavs
= server_authlist
,
1732 if (args
->mount_server
.version
== 0) {
1733 switch (args
->version
) {
1735 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1738 args
->mount_server
.version
= NFS_MNT_VERSION
;
1741 request
.version
= args
->mount_server
.version
;
1743 if (args
->mount_server
.hostname
)
1744 request
.hostname
= args
->mount_server
.hostname
;
1746 request
.hostname
= args
->nfs_server
.hostname
;
1749 * Construct the mount server's address.
1751 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1752 memcpy(request
.sap
, &args
->nfs_server
.address
,
1753 args
->nfs_server
.addrlen
);
1754 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1756 request
.salen
= args
->mount_server
.addrlen
;
1757 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1760 * Now ask the mount server to map our export path
1763 status
= nfs_mount(&request
);
1765 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1766 request
.hostname
, status
);
1773 static struct nfs_server
*nfs_try_mount_request(struct nfs_mount_info
*mount_info
,
1774 struct nfs_subversion
*nfs_mod
)
1778 bool tried_auth_unix
= false;
1779 bool auth_null_in_list
= false;
1780 struct nfs_server
*server
= ERR_PTR(-EACCES
);
1781 struct nfs_parsed_mount_data
*args
= mount_info
->parsed
;
1782 rpc_authflavor_t authlist
[NFS_MAX_SECFLAVORS
];
1783 unsigned int authlist_len
= ARRAY_SIZE(authlist
);
1785 status
= nfs_request_mount(args
, mount_info
->mntfh
, authlist
,
1788 return ERR_PTR(status
);
1791 * Was a sec= authflavor specified in the options? First, verify
1792 * whether the server supports it, and then just try to use it if so.
1794 if (args
->auth_info
.flavor_len
> 0) {
1795 status
= nfs_verify_authflavors(args
, authlist
, authlist_len
);
1796 dfprintk(MOUNT
, "NFS: using auth flavor %u\n",
1797 args
->selected_flavor
);
1799 return ERR_PTR(status
);
1800 return nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1804 * No sec= option was provided. RFC 2623, section 2.7 suggests we
1805 * SHOULD prefer the flavor listed first. However, some servers list
1806 * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
1808 for (i
= 0; i
< authlist_len
; ++i
) {
1809 rpc_authflavor_t flavor
;
1810 struct rpcsec_gss_info info
;
1812 flavor
= authlist
[i
];
1815 tried_auth_unix
= true;
1818 auth_null_in_list
= true;
1821 if (rpcauth_get_gssinfo(flavor
, &info
) != 0)
1825 dfprintk(MOUNT
, "NFS: attempting to use auth flavor %u\n", flavor
);
1826 args
->selected_flavor
= flavor
;
1827 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1828 if (!IS_ERR(server
))
1833 * Nothing we tried so far worked. At this point, give up if we've
1834 * already tried AUTH_UNIX or if the server's list doesn't contain
1837 if (tried_auth_unix
|| !auth_null_in_list
)
1840 /* Last chance! Try AUTH_UNIX */
1841 dfprintk(MOUNT
, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX
);
1842 args
->selected_flavor
= RPC_AUTH_UNIX
;
1843 return nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1846 struct dentry
*nfs_try_mount(int flags
, const char *dev_name
,
1847 struct nfs_mount_info
*mount_info
,
1848 struct nfs_subversion
*nfs_mod
)
1850 struct nfs_server
*server
;
1852 if (mount_info
->parsed
->need_mount
)
1853 server
= nfs_try_mount_request(mount_info
, nfs_mod
);
1855 server
= nfs_mod
->rpc_ops
->create_server(mount_info
, nfs_mod
);
1858 return ERR_CAST(server
);
1860 return nfs_fs_mount_common(server
, flags
, dev_name
, mount_info
, nfs_mod
);
1862 EXPORT_SYMBOL_GPL(nfs_try_mount
);
1865 * Split "dev_name" into "hostname:export_path".
1867 * The leftmost colon demarks the split between the server's hostname
1868 * and the export path. If the hostname starts with a left square
1869 * bracket, then it may contain colons.
1871 * Note: caller frees hostname and export path, even on error.
1873 static int nfs_parse_devname(const char *dev_name
,
1874 char **hostname
, size_t maxnamlen
,
1875 char **export_path
, size_t maxpathlen
)
1880 if (unlikely(!dev_name
|| !*dev_name
)) {
1881 dfprintk(MOUNT
, "NFS: device name not specified\n");
1885 /* Is the host name protected with square brakcets? */
1886 if (*dev_name
== '[') {
1887 end
= strchr(++dev_name
, ']');
1888 if (end
== NULL
|| end
[1] != ':')
1889 goto out_bad_devname
;
1891 len
= end
- dev_name
;
1896 end
= strchr(dev_name
, ':');
1898 goto out_bad_devname
;
1899 len
= end
- dev_name
;
1901 /* kill possible hostname list: not supported */
1902 comma
= strchr(dev_name
, ',');
1903 if (comma
!= NULL
&& comma
< end
)
1904 len
= comma
- dev_name
;
1907 if (len
> maxnamlen
)
1910 /* N.B. caller will free nfs_server.hostname in all cases */
1911 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1912 if (*hostname
== NULL
)
1914 len
= strlen(++end
);
1915 if (len
> maxpathlen
)
1917 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1921 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1925 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1929 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1933 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1934 return -ENAMETOOLONG
;
1937 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1938 return -ENAMETOOLONG
;
1942 * Validate the NFS2/NFS3 mount data
1943 * - fills in the mount root filehandle
1945 * For option strings, user space handles the following behaviors:
1947 * + DNS: mapping server host name to IP address ("addr=" option)
1949 * + failure mode: how to behave if a mount request can't be handled
1950 * immediately ("fg/bg" option)
1952 * + retry: how often to retry a mount request ("retry=" option)
1954 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1955 * mountproto=tcp after mountproto=udp, and so on
1957 static int nfs23_validate_mount_data(void *options
,
1958 struct nfs_parsed_mount_data
*args
,
1959 struct nfs_fh
*mntfh
,
1960 const char *dev_name
)
1962 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1963 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1964 int extra_flags
= NFS_MOUNT_LEGACY_INTERFACE
;
1969 args
->version
= NFS_DEFAULT_VERSION
;
1970 switch (data
->version
) {
1976 if (data
->flags
& NFS_MOUNT_VER3
)
1978 data
->root
.size
= NFS2_FHSIZE
;
1979 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1980 /* Turn off security negotiation */
1981 extra_flags
|= NFS_MOUNT_SECFLAVOUR
;
1983 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1986 memset(data
->context
, 0, sizeof(data
->context
));
1988 if (data
->flags
& NFS_MOUNT_VER3
) {
1989 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1990 goto out_invalid_fh
;
1991 mntfh
->size
= data
->root
.size
;
1994 mntfh
->size
= NFS2_FHSIZE
;
1999 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
2000 if (mntfh
->size
< sizeof(mntfh
->data
))
2001 memset(mntfh
->data
+ mntfh
->size
, 0,
2002 sizeof(mntfh
->data
) - mntfh
->size
);
2005 * Translate to nfs_parsed_mount_data, which nfs_fill_super
2008 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
2009 args
->flags
|= extra_flags
;
2010 args
->rsize
= data
->rsize
;
2011 args
->wsize
= data
->wsize
;
2012 args
->timeo
= data
->timeo
;
2013 args
->retrans
= data
->retrans
;
2014 args
->acregmin
= data
->acregmin
;
2015 args
->acregmax
= data
->acregmax
;
2016 args
->acdirmin
= data
->acdirmin
;
2017 args
->acdirmax
= data
->acdirmax
;
2018 args
->need_mount
= false;
2020 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
2021 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
2022 args
->nfs_server
.port
= ntohs(data
->addr
.sin_port
);
2023 if (sap
->sa_family
!= AF_INET
||
2024 !nfs_verify_server_address(sap
))
2025 goto out_no_address
;
2027 if (!(data
->flags
& NFS_MOUNT_TCP
))
2028 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
2029 /* N.B. caller will free nfs_server.hostname in all cases */
2030 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
2031 args
->namlen
= data
->namlen
;
2032 args
->bsize
= data
->bsize
;
2034 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
2035 args
->selected_flavor
= data
->pseudoflavor
;
2037 args
->selected_flavor
= RPC_AUTH_UNIX
;
2038 if (!args
->nfs_server
.hostname
)
2041 if (!(data
->flags
& NFS_MOUNT_NONLM
))
2042 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
2043 NFS_MOUNT_LOCAL_FCNTL
);
2045 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
2046 NFS_MOUNT_LOCAL_FCNTL
);
2048 * The legacy version 6 binary mount data from userspace has a
2049 * field used only to transport selinux information into the
2050 * the kernel. To continue to support that functionality we
2051 * have a touch of selinux knowledge here in the NFS code. The
2052 * userspace code converted context=blah to just blah so we are
2053 * converting back to the full string selinux understands.
2055 if (data
->context
[0]){
2056 #ifdef CONFIG_SECURITY_SELINUX
2058 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
2061 strcpy(opts_str
, "context=");
2062 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
2063 strcat(opts_str
, &data
->context
[0]);
2064 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
2075 return NFS_TEXT_DATA
;
2081 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
2085 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
2090 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2094 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
2098 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2102 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
2106 #if IS_ENABLED(CONFIG_NFS_V4)
2107 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
2109 struct nfs_parsed_mount_data
*args
,
2110 struct nfs_fh
*mntfh
,
2111 const char *dev_name
)
2113 if (fs_type
== &nfs_fs_type
)
2114 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2115 return nfs4_validate_mount_data(options
, args
, dev_name
);
2118 static int nfs_validate_mount_data(struct file_system_type
*fs_type
,
2120 struct nfs_parsed_mount_data
*args
,
2121 struct nfs_fh
*mntfh
,
2122 const char *dev_name
)
2124 return nfs23_validate_mount_data(options
, args
, mntfh
, dev_name
);
2128 static int nfs_validate_text_mount_data(void *options
,
2129 struct nfs_parsed_mount_data
*args
,
2130 const char *dev_name
)
2133 int max_namelen
= PAGE_SIZE
;
2134 int max_pathlen
= NFS_MAXPATHLEN
;
2135 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2137 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2140 if (!nfs_verify_server_address(sap
))
2141 goto out_no_address
;
2143 if (args
->version
== 4) {
2144 #if IS_ENABLED(CONFIG_NFS_V4)
2146 max_namelen
= NFS4_MAXNAMLEN
;
2147 max_pathlen
= NFS4_MAXPATHLEN
;
2148 nfs_validate_transport_protocol(args
);
2149 if (args
->nfs_server
.protocol
== XPRT_TRANSPORT_UDP
)
2150 goto out_invalid_transport_udp
;
2151 nfs4_validate_mount_flags(args
);
2153 goto out_v4_not_compiled
;
2154 #endif /* CONFIG_NFS_V4 */
2156 nfs_set_mount_transport_protocol(args
);
2158 nfs_set_port(sap
, &args
->nfs_server
.port
, port
);
2160 return nfs_parse_devname(dev_name
,
2161 &args
->nfs_server
.hostname
,
2163 &args
->nfs_server
.export_path
,
2166 #if !IS_ENABLED(CONFIG_NFS_V4)
2167 out_v4_not_compiled
:
2168 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2169 return -EPROTONOSUPPORT
;
2171 out_invalid_transport_udp
:
2172 dfprintk(MOUNT
, "NFSv4: Unsupported transport protocol udp\n");
2174 #endif /* !CONFIG_NFS_V4 */
2177 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2181 #define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \
2182 | NFS_MOUNT_SECURE \
2185 | NFS_MOUNT_KERBEROS \
2187 | NFS_MOUNT_BROKEN_SUID \
2188 | NFS_MOUNT_STRICTLOCK \
2189 | NFS_MOUNT_LEGACY_INTERFACE)
2191 #define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \
2192 ~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT))
2195 nfs_compare_remount_data(struct nfs_server
*nfss
,
2196 struct nfs_parsed_mount_data
*data
)
2198 if ((data
->flags
^ nfss
->flags
) & NFS_REMOUNT_CMP_FLAGMASK
||
2199 data
->rsize
!= nfss
->rsize
||
2200 data
->wsize
!= nfss
->wsize
||
2201 data
->version
!= nfss
->nfs_client
->rpc_ops
->version
||
2202 data
->minorversion
!= nfss
->nfs_client
->cl_minorversion
||
2203 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
2204 !nfs_auth_info_match(&data
->auth_info
, nfss
->client
->cl_auth
->au_flavor
) ||
2205 data
->acregmin
!= nfss
->acregmin
/ HZ
||
2206 data
->acregmax
!= nfss
->acregmax
/ HZ
||
2207 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
2208 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
2209 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
2210 data
->nfs_server
.port
!= nfss
->port
||
2211 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
2212 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
2213 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
2220 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
2223 struct nfs_server
*nfss
= sb
->s_fs_info
;
2224 struct nfs_parsed_mount_data
*data
;
2225 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
2226 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
2227 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
2229 sync_filesystem(sb
);
2232 * Userspace mount programs that send binary options generally send
2233 * them populated with default values. We have no way to know which
2234 * ones were explicitly specified. Fall back to legacy behavior and
2235 * just return success.
2237 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2238 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2239 options
->version
<= 6))))
2242 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2246 /* fill out struct with values from existing mount */
2247 data
->flags
= nfss
->flags
;
2248 data
->rsize
= nfss
->rsize
;
2249 data
->wsize
= nfss
->wsize
;
2250 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2251 data
->selected_flavor
= nfss
->client
->cl_auth
->au_flavor
;
2252 data
->acregmin
= nfss
->acregmin
/ HZ
;
2253 data
->acregmax
= nfss
->acregmax
/ HZ
;
2254 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2255 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2256 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2257 data
->nfs_server
.port
= nfss
->port
;
2258 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2259 data
->version
= nfsvers
;
2260 data
->minorversion
= nfss
->nfs_client
->cl_minorversion
;
2261 data
->net
= current
->nsproxy
->net_ns
;
2262 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2263 data
->nfs_server
.addrlen
);
2265 /* overwrite those values with any that were specified */
2267 if (!nfs_parse_mount_options((char *)options
, data
))
2271 * noac is a special case. It implies -o sync, but that's not
2272 * necessarily reflected in the mtab options. do_remount_sb
2273 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2274 * remount options, so we have to explicitly reset it.
2276 if (data
->flags
& NFS_MOUNT_NOAC
)
2277 *flags
|= MS_SYNCHRONOUS
;
2279 /* compare new mount options with old ones */
2280 error
= nfs_compare_remount_data(nfss
, data
);
2285 EXPORT_SYMBOL_GPL(nfs_remount
);
2288 * Initialise the common bits of the superblock
2290 inline void nfs_initialise_sb(struct super_block
*sb
)
2292 struct nfs_server
*server
= NFS_SB(sb
);
2294 sb
->s_magic
= NFS_SUPER_MAGIC
;
2296 /* We probably want something more informative here */
2297 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2298 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2300 if (sb
->s_blocksize
== 0)
2301 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2302 &sb
->s_blocksize_bits
);
2304 sb
->s_bdi
= &server
->backing_dev_info
;
2306 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2310 * Finish setting up an NFS2/3 superblock
2312 void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2314 struct nfs_parsed_mount_data
*data
= mount_info
->parsed
;
2315 struct nfs_server
*server
= NFS_SB(sb
);
2317 sb
->s_blocksize_bits
= 0;
2318 sb
->s_blocksize
= 0;
2319 sb
->s_xattr
= server
->nfs_client
->cl_nfs_mod
->xattr
;
2320 sb
->s_op
= server
->nfs_client
->cl_nfs_mod
->sops
;
2321 if (data
&& data
->bsize
)
2322 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2324 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2325 /* The VFS shouldn't apply the umask to mode bits. We will do
2326 * so ourselves when necessary.
2328 sb
->s_flags
|= MS_POSIXACL
;
2329 sb
->s_time_gran
= 1;
2332 nfs_initialise_sb(sb
);
2334 EXPORT_SYMBOL_GPL(nfs_fill_super
);
2337 * Finish setting up a cloned NFS2/3/4 superblock
2339 void nfs_clone_super(struct super_block
*sb
, struct nfs_mount_info
*mount_info
)
2341 const struct super_block
*old_sb
= mount_info
->cloned
->sb
;
2342 struct nfs_server
*server
= NFS_SB(sb
);
2344 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2345 sb
->s_blocksize
= old_sb
->s_blocksize
;
2346 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2347 sb
->s_xattr
= old_sb
->s_xattr
;
2348 sb
->s_op
= old_sb
->s_op
;
2349 sb
->s_time_gran
= 1;
2351 if (server
->nfs_client
->rpc_ops
->version
!= 2) {
2352 /* The VFS shouldn't apply the umask to mode bits. We will do
2353 * so ourselves when necessary.
2355 sb
->s_flags
|= MS_POSIXACL
;
2358 nfs_initialise_sb(sb
);
2361 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2363 const struct nfs_server
*a
= s
->s_fs_info
;
2364 const struct rpc_clnt
*clnt_a
= a
->client
;
2365 const struct rpc_clnt
*clnt_b
= b
->client
;
2367 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2369 if (a
->nfs_client
!= b
->nfs_client
)
2371 if ((a
->flags
^ b
->flags
) & NFS_MOUNT_CMP_FLAGMASK
)
2373 if (a
->wsize
!= b
->wsize
)
2375 if (a
->rsize
!= b
->rsize
)
2377 if (a
->acregmin
!= b
->acregmin
)
2379 if (a
->acregmax
!= b
->acregmax
)
2381 if (a
->acdirmin
!= b
->acdirmin
)
2383 if (a
->acdirmax
!= b
->acdirmax
)
2385 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2392 struct nfs_sb_mountdata
{
2393 struct nfs_server
*server
;
2397 static int nfs_set_super(struct super_block
*s
, void *data
)
2399 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2400 struct nfs_server
*server
= sb_mntdata
->server
;
2403 s
->s_flags
= sb_mntdata
->mntflags
;
2404 s
->s_fs_info
= server
;
2405 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2406 ret
= set_anon_super(s
, server
);
2408 server
->s_dev
= s
->s_dev
;
2412 static int nfs_compare_super_address(struct nfs_server
*server1
,
2413 struct nfs_server
*server2
)
2415 struct sockaddr
*sap1
, *sap2
;
2417 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2418 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2420 if (sap1
->sa_family
!= sap2
->sa_family
)
2423 switch (sap1
->sa_family
) {
2425 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2426 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2427 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2429 if (sin1
->sin_port
!= sin2
->sin_port
)
2434 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2435 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2436 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2438 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2449 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2451 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2452 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2453 int mntflags
= sb_mntdata
->mntflags
;
2455 if (!nfs_compare_super_address(old
, server
))
2457 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2458 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2460 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2462 return nfs_compare_mount_options(sb
, server
, mntflags
);
2465 #ifdef CONFIG_NFS_FSCACHE
2466 static void nfs_get_cache_cookie(struct super_block
*sb
,
2467 struct nfs_parsed_mount_data
*parsed
,
2468 struct nfs_clone_mount
*cloned
)
2470 struct nfs_server
*nfss
= NFS_SB(sb
);
2474 nfss
->fscache_key
= NULL
;
2475 nfss
->fscache
= NULL
;
2478 if (!(parsed
->options
& NFS_OPTION_FSCACHE
))
2480 if (parsed
->fscache_uniq
) {
2481 uniq
= parsed
->fscache_uniq
;
2482 ulen
= strlen(parsed
->fscache_uniq
);
2484 } else if (cloned
) {
2485 struct nfs_server
*mnt_s
= NFS_SB(cloned
->sb
);
2486 if (!(mnt_s
->options
& NFS_OPTION_FSCACHE
))
2488 if (mnt_s
->fscache_key
) {
2489 uniq
= mnt_s
->fscache_key
->key
.uniquifier
;
2490 ulen
= mnt_s
->fscache_key
->key
.uniq_len
;
2495 nfs_fscache_get_super_cookie(sb
, uniq
, ulen
);
2498 static void nfs_get_cache_cookie(struct super_block
*sb
,
2499 struct nfs_parsed_mount_data
*parsed
,
2500 struct nfs_clone_mount
*cloned
)
2505 static int nfs_bdi_register(struct nfs_server
*server
)
2507 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2510 int nfs_set_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2511 struct nfs_mount_info
*mount_info
)
2514 unsigned long kflags
= 0, kflags_out
= 0;
2515 if (NFS_SB(s
)->caps
& NFS_CAP_SECURITY_LABEL
)
2516 kflags
|= SECURITY_LSM_NATIVE_LABELS
;
2518 error
= security_sb_set_mnt_opts(s
, &mount_info
->parsed
->lsm_opts
,
2519 kflags
, &kflags_out
);
2523 if (NFS_SB(s
)->caps
& NFS_CAP_SECURITY_LABEL
&&
2524 !(kflags_out
& SECURITY_LSM_NATIVE_LABELS
))
2525 NFS_SB(s
)->caps
&= ~NFS_CAP_SECURITY_LABEL
;
2529 EXPORT_SYMBOL_GPL(nfs_set_sb_security
);
2531 int nfs_clone_sb_security(struct super_block
*s
, struct dentry
*mntroot
,
2532 struct nfs_mount_info
*mount_info
)
2534 /* clone any lsm security options from the parent to the new sb */
2535 if (d_inode(mntroot
)->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
)
2537 return security_sb_clone_mnt_opts(mount_info
->cloned
->sb
, s
);
2539 EXPORT_SYMBOL_GPL(nfs_clone_sb_security
);
2541 struct dentry
*nfs_fs_mount_common(struct nfs_server
*server
,
2542 int flags
, const char *dev_name
,
2543 struct nfs_mount_info
*mount_info
,
2544 struct nfs_subversion
*nfs_mod
)
2546 struct super_block
*s
;
2547 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2548 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2549 struct nfs_sb_mountdata sb_mntdata
= {
2555 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2556 compare_super
= NULL
;
2558 /* -o noac implies -o sync */
2559 if (server
->flags
& NFS_MOUNT_NOAC
)
2560 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2562 if (mount_info
->cloned
!= NULL
&& mount_info
->cloned
->sb
!= NULL
)
2563 if (mount_info
->cloned
->sb
->s_flags
& MS_SYNCHRONOUS
)
2564 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2566 /* Get a superblock - note that we may end up sharing one that already exists */
2567 s
= sget(nfs_mod
->nfs_fs
, compare_super
, nfs_set_super
, flags
, &sb_mntdata
);
2569 mntroot
= ERR_CAST(s
);
2573 if (s
->s_fs_info
!= server
) {
2574 nfs_free_server(server
);
2577 error
= nfs_bdi_register(server
);
2579 mntroot
= ERR_PTR(error
);
2580 goto error_splat_super
;
2586 /* initial superblock/root creation */
2587 mount_info
->fill_super(s
, mount_info
);
2588 nfs_get_cache_cookie(s
, mount_info
->parsed
, mount_info
->cloned
);
2589 if (!(server
->flags
& NFS_MOUNT_UNSHARED
))
2590 s
->s_iflags
|= SB_I_MULTIROOT
;
2593 mntroot
= nfs_get_root(s
, mount_info
->mntfh
, dev_name
);
2594 if (IS_ERR(mntroot
))
2595 goto error_splat_super
;
2597 error
= mount_info
->set_security(s
, mntroot
, mount_info
);
2599 goto error_splat_root
;
2601 s
->s_flags
|= MS_ACTIVE
;
2607 nfs_free_server(server
);
2612 mntroot
= ERR_PTR(error
);
2614 deactivate_locked_super(s
);
2617 EXPORT_SYMBOL_GPL(nfs_fs_mount_common
);
2619 struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2620 int flags
, const char *dev_name
, void *raw_data
)
2622 struct nfs_mount_info mount_info
= {
2623 .fill_super
= nfs_fill_super
,
2624 .set_security
= nfs_set_sb_security
,
2626 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2627 struct nfs_subversion
*nfs_mod
;
2630 mount_info
.parsed
= nfs_alloc_parsed_mount_data();
2631 mount_info
.mntfh
= nfs_alloc_fhandle();
2632 if (mount_info
.parsed
== NULL
|| mount_info
.mntfh
== NULL
)
2635 /* Validate the mount data */
2636 error
= nfs_validate_mount_data(fs_type
, raw_data
, mount_info
.parsed
, mount_info
.mntfh
, dev_name
);
2637 if (error
== NFS_TEXT_DATA
)
2638 error
= nfs_validate_text_mount_data(raw_data
, mount_info
.parsed
, dev_name
);
2640 mntroot
= ERR_PTR(error
);
2644 nfs_mod
= get_nfs_version(mount_info
.parsed
->version
);
2645 if (IS_ERR(nfs_mod
)) {
2646 mntroot
= ERR_CAST(nfs_mod
);
2650 mntroot
= nfs_mod
->rpc_ops
->try_mount(flags
, dev_name
, &mount_info
, nfs_mod
);
2652 put_nfs_version(nfs_mod
);
2654 nfs_free_parsed_mount_data(mount_info
.parsed
);
2655 nfs_free_fhandle(mount_info
.mntfh
);
2658 EXPORT_SYMBOL_GPL(nfs_fs_mount
);
2661 * Destroy an NFS2/3 superblock
2663 void nfs_kill_super(struct super_block
*s
)
2665 struct nfs_server
*server
= NFS_SB(s
);
2666 dev_t dev
= s
->s_dev
;
2668 generic_shutdown_super(s
);
2670 nfs_fscache_release_super_cookie(s
);
2672 nfs_free_server(server
);
2673 free_anon_bdev(dev
);
2675 EXPORT_SYMBOL_GPL(nfs_kill_super
);
2678 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
2680 static struct dentry
*
2681 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2682 const char *dev_name
, void *raw_data
)
2684 struct nfs_clone_mount
*data
= raw_data
;
2685 struct nfs_mount_info mount_info
= {
2686 .fill_super
= nfs_clone_super
,
2687 .set_security
= nfs_clone_sb_security
,
2690 struct nfs_server
*server
;
2691 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2692 struct nfs_subversion
*nfs_mod
= NFS_SB(data
->sb
)->nfs_client
->cl_nfs_mod
;
2694 dprintk("--> nfs_xdev_mount()\n");
2696 mount_info
.mntfh
= mount_info
.cloned
->fh
;
2698 /* create a new volume representation */
2699 server
= nfs_mod
->rpc_ops
->clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2702 mntroot
= ERR_CAST(server
);
2704 mntroot
= nfs_fs_mount_common(server
, flags
,
2705 dev_name
, &mount_info
, nfs_mod
);
2707 dprintk("<-- nfs_xdev_mount() = %ld\n",
2708 IS_ERR(mntroot
) ? PTR_ERR(mntroot
) : 0L);
2712 #if IS_ENABLED(CONFIG_NFS_V4)
2714 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2716 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2717 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2721 * Validate NFSv4 mount options
2723 static int nfs4_validate_mount_data(void *options
,
2724 struct nfs_parsed_mount_data
*args
,
2725 const char *dev_name
)
2727 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2728 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2736 switch (data
->version
) {
2738 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2739 goto out_no_address
;
2740 if (data
->host_addrlen
== 0)
2741 goto out_no_address
;
2742 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2743 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2745 if (!nfs_verify_server_address(sap
))
2746 goto out_no_address
;
2747 args
->nfs_server
.port
= ntohs(((struct sockaddr_in
*)sap
)->sin_port
);
2749 if (data
->auth_flavourlen
) {
2750 rpc_authflavor_t pseudoflavor
;
2751 if (data
->auth_flavourlen
> 1)
2752 goto out_inval_auth
;
2753 if (copy_from_user(&pseudoflavor
,
2754 data
->auth_flavours
,
2755 sizeof(pseudoflavor
)))
2757 args
->selected_flavor
= pseudoflavor
;
2759 args
->selected_flavor
= RPC_AUTH_UNIX
;
2761 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2764 args
->nfs_server
.hostname
= c
;
2766 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2769 args
->nfs_server
.export_path
= c
;
2770 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2772 c
= strndup_user(data
->client_addr
.data
, 16);
2775 args
->client_address
= c
;
2778 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2782 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2783 args
->rsize
= data
->rsize
;
2784 args
->wsize
= data
->wsize
;
2785 args
->timeo
= data
->timeo
;
2786 args
->retrans
= data
->retrans
;
2787 args
->acregmin
= data
->acregmin
;
2788 args
->acregmax
= data
->acregmax
;
2789 args
->acdirmin
= data
->acdirmin
;
2790 args
->acdirmax
= data
->acdirmax
;
2791 args
->nfs_server
.protocol
= data
->proto
;
2792 nfs_validate_transport_protocol(args
);
2793 if (args
->nfs_server
.protocol
== XPRT_TRANSPORT_UDP
)
2794 goto out_invalid_transport_udp
;
2798 return NFS_TEXT_DATA
;
2804 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2808 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2809 data
->auth_flavourlen
);
2813 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2816 out_invalid_transport_udp
:
2817 dfprintk(MOUNT
, "NFSv4: Unsupported transport protocol udp\n");
2822 * NFS v4 module parameters need to stay in the
2823 * NFS client for backwards compatibility
2825 unsigned int nfs_callback_set_tcpport
;
2826 /* Default cache timeout is 10 minutes */
2827 unsigned int nfs_idmap_cache_timeout
= 600;
2828 /* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */
2829 bool nfs4_disable_idmapping
= true;
2830 unsigned short max_session_slots
= NFS4_DEF_SLOT_TABLE_SIZE
;
2831 unsigned short send_implementation_id
= 1;
2832 char nfs4_client_id_uniquifier
[NFS4_CLIENT_ID_UNIQ_LEN
] = "";
2833 bool recover_lost_locks
= false;
2835 EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport
);
2836 EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout
);
2837 EXPORT_SYMBOL_GPL(nfs4_disable_idmapping
);
2838 EXPORT_SYMBOL_GPL(max_session_slots
);
2839 EXPORT_SYMBOL_GPL(send_implementation_id
);
2840 EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier
);
2841 EXPORT_SYMBOL_GPL(recover_lost_locks
);
2843 #define NFS_CALLBACK_MAXPORTNR (65535U)
2845 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2852 ret
= kstrtoul(val
, 0, &num
);
2853 if (ret
== -EINVAL
|| num
> NFS_CALLBACK_MAXPORTNR
)
2855 *((unsigned int *)kp
->arg
) = num
;
2858 static const struct kernel_param_ops param_ops_portnr
= {
2859 .set
= param_set_portnr
,
2860 .get
= param_get_uint
,
2862 #define param_check_portnr(name, p) __param_check(name, p, unsigned int);
2864 module_param_named(callback_tcpport
, nfs_callback_set_tcpport
, portnr
, 0644);
2865 module_param(nfs_idmap_cache_timeout
, int, 0644);
2866 module_param(nfs4_disable_idmapping
, bool, 0644);
2867 module_param_string(nfs4_unique_id
, nfs4_client_id_uniquifier
,
2868 NFS4_CLIENT_ID_UNIQ_LEN
, 0600);
2869 MODULE_PARM_DESC(nfs4_disable_idmapping
,
2870 "Turn off NFSv4 idmapping when using 'sec=sys'");
2871 module_param(max_session_slots
, ushort
, 0644);
2872 MODULE_PARM_DESC(max_session_slots
, "Maximum number of outstanding NFSv4.1 "
2873 "requests the client will negotiate");
2874 module_param(send_implementation_id
, ushort
, 0644);
2875 MODULE_PARM_DESC(send_implementation_id
,
2876 "Send implementation ID with NFSv4.1 exchange_id");
2877 MODULE_PARM_DESC(nfs4_unique_id
, "nfs_client_id4 uniquifier string");
2879 module_param(recover_lost_locks
, bool, 0644);
2880 MODULE_PARM_DESC(recover_lost_locks
,
2881 "If the server reports that a lock might be lost, "
2882 "try to recover it risking data corruption.");
2885 #endif /* CONFIG_NFS_V4 */