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/mnt_namespace.h>
45 #include <linux/namei.h>
46 #include <linux/nfs_idmap.h>
47 #include <linux/vfs.h>
48 #include <linux/inet.h>
49 #include <linux/in6.h>
50 #include <linux/slab.h>
52 #include <linux/netdevice.h>
53 #include <linux/nfs_xdr.h>
54 #include <linux/magic.h>
55 #include <linux/parser.h>
57 #include <asm/system.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
68 #define NFSDBG_FACILITY NFSDBG_VFS
71 #define NFS_DEFAULT_VERSION 3
73 #define NFS_DEFAULT_VERSION 2
77 /* Mount options that take no arguments */
79 Opt_posix
, Opt_noposix
,
83 Opt_v2
, Opt_v3
, Opt_v4
,
84 Opt_udp
, Opt_tcp
, Opt_rdma
,
86 Opt_rdirplus
, Opt_nordirplus
,
87 Opt_sharecache
, Opt_nosharecache
,
88 Opt_resvport
, Opt_noresvport
,
89 Opt_fscache
, Opt_nofscache
,
91 /* Mount options that take integer arguments */
93 Opt_rsize
, Opt_wsize
, Opt_bsize
,
94 Opt_timeo
, Opt_retrans
,
95 Opt_acregmin
, Opt_acregmax
,
96 Opt_acdirmin
, Opt_acdirmax
,
104 /* Mount options that take string arguments */
105 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
106 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
111 /* Special mount options */
112 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
117 static const match_table_t nfs_mount_option_tokens
= {
118 { Opt_userspace
, "bg" },
119 { Opt_userspace
, "fg" },
120 { Opt_userspace
, "retry=%s" },
122 { Opt_sloppy
, "sloppy" },
124 { Opt_soft
, "soft" },
125 { Opt_hard
, "hard" },
126 { Opt_deprecated
, "intr" },
127 { Opt_deprecated
, "nointr" },
128 { Opt_posix
, "posix" },
129 { Opt_noposix
, "noposix" },
131 { Opt_nocto
, "nocto" },
133 { Opt_noac
, "noac" },
134 { Opt_lock
, "lock" },
135 { 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" },
153 { Opt_port
, "port=%s" },
154 { Opt_rsize
, "rsize=%s" },
155 { Opt_wsize
, "wsize=%s" },
156 { Opt_bsize
, "bsize=%s" },
157 { Opt_timeo
, "timeo=%s" },
158 { Opt_retrans
, "retrans=%s" },
159 { Opt_acregmin
, "acregmin=%s" },
160 { Opt_acregmax
, "acregmax=%s" },
161 { Opt_acdirmin
, "acdirmin=%s" },
162 { Opt_acdirmax
, "acdirmax=%s" },
163 { Opt_actimeo
, "actimeo=%s" },
164 { Opt_namelen
, "namlen=%s" },
165 { Opt_mountport
, "mountport=%s" },
166 { Opt_mountvers
, "mountvers=%s" },
167 { Opt_nfsvers
, "nfsvers=%s" },
168 { Opt_nfsvers
, "vers=%s" },
169 { Opt_minorversion
, "minorversion=%s" },
171 { Opt_sec
, "sec=%s" },
172 { Opt_proto
, "proto=%s" },
173 { Opt_mountproto
, "mountproto=%s" },
174 { Opt_addr
, "addr=%s" },
175 { Opt_clientaddr
, "clientaddr=%s" },
176 { Opt_mounthost
, "mounthost=%s" },
177 { Opt_mountaddr
, "mountaddr=%s" },
179 { Opt_lookupcache
, "lookupcache=%s" },
180 { Opt_fscache_uniq
, "fsc=%s" },
181 { Opt_local_lock
, "local_lock=%s" },
187 Opt_xprt_udp
, Opt_xprt_udp6
, Opt_xprt_tcp
, Opt_xprt_tcp6
, Opt_xprt_rdma
,
192 static const match_table_t nfs_xprt_protocol_tokens
= {
193 { Opt_xprt_udp
, "udp" },
194 { Opt_xprt_udp6
, "udp6" },
195 { Opt_xprt_tcp
, "tcp" },
196 { Opt_xprt_tcp6
, "tcp6" },
197 { Opt_xprt_rdma
, "rdma" },
199 { Opt_xprt_err
, NULL
}
203 Opt_sec_none
, Opt_sec_sys
,
204 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
205 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
206 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
211 static const match_table_t nfs_secflavor_tokens
= {
212 { Opt_sec_none
, "none" },
213 { Opt_sec_none
, "null" },
214 { Opt_sec_sys
, "sys" },
216 { Opt_sec_krb5
, "krb5" },
217 { Opt_sec_krb5i
, "krb5i" },
218 { Opt_sec_krb5p
, "krb5p" },
220 { Opt_sec_lkey
, "lkey" },
221 { Opt_sec_lkeyi
, "lkeyi" },
222 { Opt_sec_lkeyp
, "lkeyp" },
224 { Opt_sec_spkm
, "spkm3" },
225 { Opt_sec_spkmi
, "spkm3i" },
226 { Opt_sec_spkmp
, "spkm3p" },
228 { Opt_sec_err
, NULL
}
232 Opt_lookupcache_all
, Opt_lookupcache_positive
,
233 Opt_lookupcache_none
,
238 static match_table_t nfs_lookupcache_tokens
= {
239 { Opt_lookupcache_all
, "all" },
240 { Opt_lookupcache_positive
, "pos" },
241 { Opt_lookupcache_positive
, "positive" },
242 { Opt_lookupcache_none
, "none" },
244 { Opt_lookupcache_err
, NULL
}
248 Opt_local_lock_all
, Opt_local_lock_flock
, Opt_local_lock_posix
,
254 static match_table_t nfs_local_lock_tokens
= {
255 { Opt_local_lock_all
, "all" },
256 { Opt_local_lock_flock
, "flock" },
257 { Opt_local_lock_posix
, "posix" },
258 { Opt_local_lock_none
, "none" },
260 { Opt_local_lock_err
, NULL
}
264 static void nfs_umount_begin(struct super_block
*);
265 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
266 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
267 static int nfs_show_devname(struct seq_file
*, struct vfsmount
*);
268 static int nfs_show_path(struct seq_file
*, struct vfsmount
*);
269 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
270 static struct dentry
*nfs_fs_mount(struct file_system_type
*,
271 int, const char *, void *);
272 static struct dentry
*nfs_xdev_mount(struct file_system_type
*fs_type
,
273 int flags
, const char *dev_name
, void *raw_data
);
274 static void nfs_put_super(struct super_block
*);
275 static void nfs_kill_super(struct super_block
*);
276 static int nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
);
278 static struct file_system_type nfs_fs_type
= {
279 .owner
= THIS_MODULE
,
281 .mount
= nfs_fs_mount
,
282 .kill_sb
= nfs_kill_super
,
283 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
286 struct file_system_type nfs_xdev_fs_type
= {
287 .owner
= THIS_MODULE
,
289 .mount
= nfs_xdev_mount
,
290 .kill_sb
= nfs_kill_super
,
291 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
294 static const struct super_operations nfs_sops
= {
295 .alloc_inode
= nfs_alloc_inode
,
296 .destroy_inode
= nfs_destroy_inode
,
297 .write_inode
= nfs_write_inode
,
298 .put_super
= nfs_put_super
,
299 .statfs
= nfs_statfs
,
300 .evict_inode
= nfs_evict_inode
,
301 .umount_begin
= nfs_umount_begin
,
302 .show_options
= nfs_show_options
,
303 .show_devname
= nfs_show_devname
,
304 .show_path
= nfs_show_path
,
305 .show_stats
= nfs_show_stats
,
306 .remount_fs
= nfs_remount
,
310 static int nfs4_validate_text_mount_data(void *options
,
311 struct nfs_parsed_mount_data
*args
, const char *dev_name
);
312 static struct dentry
*nfs4_try_mount(int flags
, const char *dev_name
,
313 struct nfs_parsed_mount_data
*data
);
314 static struct dentry
*nfs4_mount(struct file_system_type
*fs_type
,
315 int flags
, const char *dev_name
, void *raw_data
);
316 static struct dentry
*nfs4_remote_mount(struct file_system_type
*fs_type
,
317 int flags
, const char *dev_name
, void *raw_data
);
318 static struct dentry
*nfs4_xdev_mount(struct file_system_type
*fs_type
,
319 int flags
, const char *dev_name
, void *raw_data
);
320 static struct dentry
*nfs4_referral_mount(struct file_system_type
*fs_type
,
321 int flags
, const char *dev_name
, void *raw_data
);
322 static struct dentry
*nfs4_remote_referral_mount(struct file_system_type
*fs_type
,
323 int flags
, const char *dev_name
, void *raw_data
);
324 static void nfs4_kill_super(struct super_block
*sb
);
326 static struct file_system_type nfs4_fs_type
= {
327 .owner
= THIS_MODULE
,
330 .kill_sb
= nfs4_kill_super
,
331 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
334 static struct file_system_type nfs4_remote_fs_type
= {
335 .owner
= THIS_MODULE
,
337 .mount
= nfs4_remote_mount
,
338 .kill_sb
= nfs4_kill_super
,
339 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
342 struct file_system_type nfs4_xdev_fs_type
= {
343 .owner
= THIS_MODULE
,
345 .mount
= nfs4_xdev_mount
,
346 .kill_sb
= nfs4_kill_super
,
347 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
350 static struct file_system_type nfs4_remote_referral_fs_type
= {
351 .owner
= THIS_MODULE
,
353 .mount
= nfs4_remote_referral_mount
,
354 .kill_sb
= nfs4_kill_super
,
355 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
358 struct file_system_type nfs4_referral_fs_type
= {
359 .owner
= THIS_MODULE
,
361 .mount
= nfs4_referral_mount
,
362 .kill_sb
= nfs4_kill_super
,
363 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
366 static const struct super_operations nfs4_sops
= {
367 .alloc_inode
= nfs_alloc_inode
,
368 .destroy_inode
= nfs_destroy_inode
,
369 .write_inode
= nfs_write_inode
,
370 .put_super
= nfs_put_super
,
371 .statfs
= nfs_statfs
,
372 .evict_inode
= nfs4_evict_inode
,
373 .umount_begin
= nfs_umount_begin
,
374 .show_options
= nfs_show_options
,
375 .show_devname
= nfs_show_devname
,
376 .show_path
= nfs_show_path
,
377 .show_stats
= nfs_show_stats
,
378 .remount_fs
= nfs_remount
,
382 static struct shrinker acl_shrinker
= {
383 .shrink
= nfs_access_cache_shrinker
,
384 .seeks
= DEFAULT_SEEKS
,
388 * Register the NFS filesystems
390 int __init
register_nfs_fs(void)
394 ret
= register_filesystem(&nfs_fs_type
);
398 ret
= nfs_register_sysctl();
402 ret
= register_filesystem(&nfs4_fs_type
);
406 register_shrinker(&acl_shrinker
);
411 nfs_unregister_sysctl();
414 unregister_filesystem(&nfs_fs_type
);
420 * Unregister the NFS filesystems
422 void __exit
unregister_nfs_fs(void)
424 unregister_shrinker(&acl_shrinker
);
426 unregister_filesystem(&nfs4_fs_type
);
428 nfs_unregister_sysctl();
429 unregister_filesystem(&nfs_fs_type
);
432 void nfs_sb_active(struct super_block
*sb
)
434 struct nfs_server
*server
= NFS_SB(sb
);
436 if (atomic_inc_return(&server
->active
) == 1)
437 atomic_inc(&sb
->s_active
);
440 void nfs_sb_deactive(struct super_block
*sb
)
442 struct nfs_server
*server
= NFS_SB(sb
);
444 if (atomic_dec_and_test(&server
->active
))
445 deactivate_super(sb
);
449 * Deliver file system statistics to userspace
451 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
453 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
454 unsigned char blockbits
;
455 unsigned long blockres
;
456 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
457 struct nfs_fsstat res
;
460 res
.fattr
= nfs_alloc_fattr();
461 if (res
.fattr
== NULL
)
464 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
465 if (unlikely(error
== -ESTALE
)) {
466 struct dentry
*pd_dentry
;
468 pd_dentry
= dget_parent(dentry
);
469 if (pd_dentry
!= NULL
) {
470 nfs_zap_caches(pd_dentry
->d_inode
);
474 nfs_free_fattr(res
.fattr
);
478 buf
->f_type
= NFS_SUPER_MAGIC
;
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
485 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
494 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
495 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
496 blockres
= (1 << blockbits
) - 1;
497 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
498 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
499 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
501 buf
->f_files
= res
.tfiles
;
502 buf
->f_ffree
= res
.afiles
;
504 buf
->f_namelen
= server
->namelen
;
509 dprintk("%s: statfs error = %d\n", __func__
, -error
);
514 * Map the security flavour number to a name
516 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
518 static const struct {
519 rpc_authflavor_t flavour
;
522 { RPC_AUTH_NULL
, "null" },
523 { RPC_AUTH_UNIX
, "sys" },
524 { RPC_AUTH_GSS_KRB5
, "krb5" },
525 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
527 { RPC_AUTH_GSS_LKEY
, "lkey" },
528 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM
, "spkm" },
531 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
533 { UINT_MAX
, "unknown" }
537 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
538 if (sec_flavours
[i
].flavour
== flavour
)
541 return sec_flavours
[i
].str
;
544 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
547 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
549 seq_printf(m
, ",mountproto=");
550 switch (sap
->sa_family
) {
552 switch (nfss
->mountd_protocol
) {
554 seq_printf(m
, RPCBIND_NETID_UDP
);
557 seq_printf(m
, RPCBIND_NETID_TCP
);
561 seq_printf(m
, "auto");
565 switch (nfss
->mountd_protocol
) {
567 seq_printf(m
, RPCBIND_NETID_UDP6
);
570 seq_printf(m
, RPCBIND_NETID_TCP6
);
574 seq_printf(m
, "auto");
579 seq_printf(m
, "auto");
583 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
586 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
588 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
591 switch (sap
->sa_family
) {
593 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
594 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
598 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
599 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
604 seq_printf(m
, ",mountaddr=unspecified");
607 if (nfss
->mountd_version
|| showdefaults
)
608 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
609 if ((nfss
->mountd_port
&&
610 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
612 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
614 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
618 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
621 struct nfs_client
*clp
= nfss
->nfs_client
;
623 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
624 seq_printf(m
, ",minorversion=%u", clp
->cl_minorversion
);
627 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
634 * Describe the mount options in force on this server representation
636 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
639 static const struct proc_nfs_info
{
644 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
645 { NFS_MOUNT_POSIX
, ",posix", "" },
646 { NFS_MOUNT_NOCTO
, ",nocto", "" },
647 { NFS_MOUNT_NOAC
, ",noac", "" },
648 { NFS_MOUNT_NONLM
, ",nolock", "" },
649 { NFS_MOUNT_NOACL
, ",noacl", "" },
650 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
651 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
655 const struct proc_nfs_info
*nfs_infop
;
656 struct nfs_client
*clp
= nfss
->nfs_client
;
657 u32 version
= clp
->rpc_ops
->version
;
658 int local_flock
, local_fcntl
;
660 seq_printf(m
, ",vers=%u", version
);
661 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
662 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
663 if (nfss
->bsize
!= 0)
664 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
665 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
666 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
667 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
668 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
669 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
670 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
671 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
672 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
673 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
674 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
675 if (nfss
->flags
& nfs_infop
->flag
)
676 seq_puts(m
, nfs_infop
->str
);
678 seq_puts(m
, nfs_infop
->nostr
);
680 seq_printf(m
, ",proto=%s",
681 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
683 if (nfss
->port
!= NFS_PORT
)
684 seq_printf(m
, ",port=%u", nfss
->port
);
687 seq_printf(m
, ",port=%u", nfss
->port
);
689 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
690 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
691 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
694 nfs_show_mountd_options(m
, nfss
, showdefaults
);
696 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
698 if (nfss
->options
& NFS_OPTION_FSCACHE
)
699 seq_printf(m
, ",fsc");
701 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
702 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
703 seq_printf(m
, ",lookupcache=none");
705 seq_printf(m
, ",lookupcache=pos");
708 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
709 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
711 if (!local_flock
&& !local_fcntl
)
712 seq_printf(m
, ",local_lock=none");
713 else if (local_flock
&& local_fcntl
)
714 seq_printf(m
, ",local_lock=all");
715 else if (local_flock
)
716 seq_printf(m
, ",local_lock=flock");
718 seq_printf(m
, ",local_lock=posix");
722 * Describe the mount options on this VFS mountpoint
724 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
726 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
728 nfs_show_mount_options(m
, nfss
, 0);
730 seq_printf(m
, ",addr=%s",
731 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
736 #ifdef CONFIG_NFS_V4_1
737 void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
739 if (nfs4_has_session(server
->nfs_client
))
740 seq_printf(m
, ",sessions");
743 void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
746 #ifdef CONFIG_NFS_V4_1
747 void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
749 seq_printf(m
, ",pnfs=");
750 if (server
->pnfs_curr_ld
)
751 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
753 seq_printf(m
, "not configured");
755 #else /* CONFIG_NFS_V4_1 */
756 void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
) {}
757 #endif /* CONFIG_NFS_V4_1 */
759 static int nfs_show_devname(struct seq_file
*m
, struct vfsmount
*mnt
)
761 char *page
= (char *) __get_free_page(GFP_KERNEL
);
762 char *devname
, *dummy
;
766 devname
= nfs_path(&dummy
, mnt
->mnt_root
, page
, PAGE_SIZE
);
768 err
= PTR_ERR(devname
);
770 seq_escape(m
, devname
, " \t\n\\");
771 free_page((unsigned long)page
);
775 static int nfs_show_path(struct seq_file
*m
, struct vfsmount
*mnt
)
782 * Present statistical information for this VFS mountpoint
784 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
787 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
788 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
789 struct nfs_iostats totals
= { };
791 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
794 * Display all mount option settings
796 seq_printf(m
, "\n\topts:\t");
797 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
798 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
799 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
800 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
801 nfs_show_mount_options(m
, nfss
, 1);
803 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
805 seq_printf(m
, "\n\tcaps:\t");
806 seq_printf(m
, "caps=0x%x", nfss
->caps
);
807 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
808 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
809 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
810 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
813 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
814 seq_printf(m
, "\n\tnfsv4:\t");
815 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
816 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
817 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
818 show_sessions(m
, nfss
);
824 * Display security flavor in effect for this mount
826 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
828 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
831 * Display superblock I/O counters
833 for_each_possible_cpu(cpu
) {
834 struct nfs_iostats
*stats
;
837 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
839 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
840 totals
.events
[i
] += stats
->events
[i
];
841 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
842 totals
.bytes
[i
] += stats
->bytes
[i
];
843 #ifdef CONFIG_NFS_FSCACHE
844 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
845 totals
.fscache
[i
] += stats
->fscache
[i
];
851 seq_printf(m
, "\n\tevents:\t");
852 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
853 seq_printf(m
, "%lu ", totals
.events
[i
]);
854 seq_printf(m
, "\n\tbytes:\t");
855 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
856 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
857 #ifdef CONFIG_NFS_FSCACHE
858 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
859 seq_printf(m
, "\n\tfsc:\t");
860 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
861 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
866 rpc_print_iostats(m
, nfss
->client
);
872 * Begin unmount by attempting to remove all automounted mountpoints we added
873 * in response to xdev traversals and referrals
875 static void nfs_umount_begin(struct super_block
*sb
)
877 struct nfs_server
*server
;
878 struct rpc_clnt
*rpc
;
881 /* -EIO all pending I/O */
882 rpc
= server
->client_acl
;
884 rpc_killall_tasks(rpc
);
885 rpc
= server
->client
;
887 rpc_killall_tasks(rpc
);
890 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(unsigned int version
)
892 struct nfs_parsed_mount_data
*data
;
894 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
896 data
->acregmin
= NFS_DEF_ACREGMIN
;
897 data
->acregmax
= NFS_DEF_ACREGMAX
;
898 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
899 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
900 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
901 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
902 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
903 data
->auth_flavors
[0] = RPC_AUTH_UNIX
;
904 data
->auth_flavor_len
= 1;
905 data
->version
= version
;
906 data
->minorversion
= 0;
912 * Sanity-check a server address provided by the mount command.
914 * Address family must be initialized, and address must not be
915 * the ANY address for that family.
917 static int nfs_verify_server_address(struct sockaddr
*addr
)
919 switch (addr
->sa_family
) {
921 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
922 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
925 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
926 return !ipv6_addr_any(sa
);
930 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
935 * Select between a default port value and a user-specified port value.
936 * If a zero value is set, then autobind will be used.
938 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
939 const unsigned short default_port
)
941 if (*port
== NFS_UNSPEC_PORT
)
942 *port
= default_port
;
944 rpc_set_port(sap
, *port
);
948 * Sanity check the NFS transport protocol.
951 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
953 switch (mnt
->nfs_server
.protocol
) {
954 case XPRT_TRANSPORT_UDP
:
955 case XPRT_TRANSPORT_TCP
:
956 case XPRT_TRANSPORT_RDMA
:
959 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
964 * For text based NFSv2/v3 mounts, the mount protocol transport default
965 * settings should depend upon the specified NFS transport.
967 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
969 nfs_validate_transport_protocol(mnt
);
971 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
972 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
974 switch (mnt
->nfs_server
.protocol
) {
975 case XPRT_TRANSPORT_UDP
:
976 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
978 case XPRT_TRANSPORT_TCP
:
979 case XPRT_TRANSPORT_RDMA
:
980 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
985 * Parse the value of the 'sec=' option.
987 static int nfs_parse_security_flavors(char *value
,
988 struct nfs_parsed_mount_data
*mnt
)
990 substring_t args
[MAX_OPT_ARGS
];
992 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
994 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
996 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
999 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1002 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
1005 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
1008 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
1011 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
1014 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
1017 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1020 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1023 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1026 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1032 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1033 mnt
->auth_flavor_len
= 1;
1037 static int nfs_get_option_str(substring_t args
[], char **option
)
1040 *option
= match_strdup(args
);
1044 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1049 string
= match_strdup(args
);
1052 rc
= strict_strtoul(string
, 10, option
);
1059 * Error-check and convert a string of mount options from user space into
1060 * a data structure. The whole mount string is processed; bad options are
1061 * skipped as they are encountered. If there were no errors, return 1;
1062 * otherwise return 0 (zero).
1064 static int nfs_parse_mount_options(char *raw
,
1065 struct nfs_parsed_mount_data
*mnt
)
1067 char *p
, *string
, *secdata
;
1068 int rc
, sloppy
= 0, invalid_option
= 0;
1069 unsigned short protofamily
= AF_UNSPEC
;
1070 unsigned short mountfamily
= AF_UNSPEC
;
1073 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1076 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1078 secdata
= alloc_secdata();
1082 rc
= security_sb_copy_data(raw
, secdata
);
1084 goto out_security_failure
;
1086 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1088 goto out_security_failure
;
1090 free_secdata(secdata
);
1092 while ((p
= strsep(&raw
, ",")) != NULL
) {
1093 substring_t args
[MAX_OPT_ARGS
];
1094 unsigned long option
;
1100 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1102 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1106 * boolean options: foo/nofoo
1109 mnt
->flags
|= NFS_MOUNT_SOFT
;
1112 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1115 mnt
->flags
|= NFS_MOUNT_POSIX
;
1118 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1121 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1124 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1127 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1130 mnt
->flags
|= NFS_MOUNT_NOAC
;
1133 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1134 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1135 NFS_MOUNT_LOCAL_FCNTL
);
1138 mnt
->flags
|= NFS_MOUNT_NONLM
;
1139 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1140 NFS_MOUNT_LOCAL_FCNTL
);
1143 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1147 mnt
->flags
|= NFS_MOUNT_VER3
;
1151 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1155 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1156 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1159 mnt
->flags
|= NFS_MOUNT_TCP
;
1160 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1163 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1164 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1165 xprt_load_transport(p
);
1168 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1171 mnt
->flags
|= NFS_MOUNT_NOACL
;
1174 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1176 case Opt_nordirplus
:
1177 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1179 case Opt_sharecache
:
1180 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1182 case Opt_nosharecache
:
1183 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1186 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1188 case Opt_noresvport
:
1189 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1192 mnt
->options
|= NFS_OPTION_FSCACHE
;
1193 kfree(mnt
->fscache_uniq
);
1194 mnt
->fscache_uniq
= NULL
;
1197 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1198 kfree(mnt
->fscache_uniq
);
1199 mnt
->fscache_uniq
= NULL
;
1203 * options that take numeric values
1206 if (nfs_get_option_ul(args
, &option
) ||
1208 goto out_invalid_value
;
1209 mnt
->nfs_server
.port
= option
;
1212 if (nfs_get_option_ul(args
, &option
))
1213 goto out_invalid_value
;
1214 mnt
->rsize
= option
;
1217 if (nfs_get_option_ul(args
, &option
))
1218 goto out_invalid_value
;
1219 mnt
->wsize
= option
;
1222 if (nfs_get_option_ul(args
, &option
))
1223 goto out_invalid_value
;
1224 mnt
->bsize
= option
;
1227 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1228 goto out_invalid_value
;
1229 mnt
->timeo
= option
;
1232 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1233 goto out_invalid_value
;
1234 mnt
->retrans
= option
;
1237 if (nfs_get_option_ul(args
, &option
))
1238 goto out_invalid_value
;
1239 mnt
->acregmin
= option
;
1242 if (nfs_get_option_ul(args
, &option
))
1243 goto out_invalid_value
;
1244 mnt
->acregmax
= option
;
1247 if (nfs_get_option_ul(args
, &option
))
1248 goto out_invalid_value
;
1249 mnt
->acdirmin
= option
;
1252 if (nfs_get_option_ul(args
, &option
))
1253 goto out_invalid_value
;
1254 mnt
->acdirmax
= option
;
1257 if (nfs_get_option_ul(args
, &option
))
1258 goto out_invalid_value
;
1259 mnt
->acregmin
= mnt
->acregmax
=
1260 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1263 if (nfs_get_option_ul(args
, &option
))
1264 goto out_invalid_value
;
1265 mnt
->namlen
= option
;
1268 if (nfs_get_option_ul(args
, &option
) ||
1270 goto out_invalid_value
;
1271 mnt
->mount_server
.port
= option
;
1274 if (nfs_get_option_ul(args
, &option
) ||
1275 option
< NFS_MNT_VERSION
||
1276 option
> NFS_MNT3_VERSION
)
1277 goto out_invalid_value
;
1278 mnt
->mount_server
.version
= option
;
1281 if (nfs_get_option_ul(args
, &option
))
1282 goto out_invalid_value
;
1285 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1289 mnt
->flags
|= NFS_MOUNT_VER3
;
1293 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1297 goto out_invalid_value
;
1300 case Opt_minorversion
:
1301 if (nfs_get_option_ul(args
, &option
))
1302 goto out_invalid_value
;
1303 if (option
> NFS4_MAX_MINOR_VERSION
)
1304 goto out_invalid_value
;
1305 mnt
->minorversion
= option
;
1309 * options that take text values
1312 string
= match_strdup(args
);
1315 rc
= nfs_parse_security_flavors(string
, mnt
);
1318 dfprintk(MOUNT
, "NFS: unrecognized "
1319 "security flavor\n");
1324 string
= match_strdup(args
);
1327 token
= match_token(string
,
1328 nfs_xprt_protocol_tokens
, args
);
1330 protofamily
= AF_INET
;
1333 protofamily
= AF_INET6
;
1335 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1336 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1339 protofamily
= AF_INET6
;
1341 mnt
->flags
|= NFS_MOUNT_TCP
;
1342 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1345 /* vector side protocols to TCP */
1346 mnt
->flags
|= NFS_MOUNT_TCP
;
1347 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1348 xprt_load_transport(string
);
1351 dfprintk(MOUNT
, "NFS: unrecognized "
1352 "transport protocol\n");
1358 case Opt_mountproto
:
1359 string
= match_strdup(args
);
1362 token
= match_token(string
,
1363 nfs_xprt_protocol_tokens
, args
);
1366 mountfamily
= AF_INET
;
1369 mountfamily
= AF_INET6
;
1371 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1374 mountfamily
= AF_INET6
;
1376 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1378 case Opt_xprt_rdma
: /* not used for side protocols */
1380 dfprintk(MOUNT
, "NFS: unrecognized "
1381 "transport protocol\n");
1386 string
= match_strdup(args
);
1389 mnt
->nfs_server
.addrlen
=
1390 rpc_pton(string
, strlen(string
),
1392 &mnt
->nfs_server
.address
,
1393 sizeof(mnt
->nfs_server
.address
));
1395 if (mnt
->nfs_server
.addrlen
== 0)
1396 goto out_invalid_address
;
1398 case Opt_clientaddr
:
1399 if (nfs_get_option_str(args
, &mnt
->client_address
))
1403 if (nfs_get_option_str(args
,
1404 &mnt
->mount_server
.hostname
))
1408 string
= match_strdup(args
);
1411 mnt
->mount_server
.addrlen
=
1412 rpc_pton(string
, strlen(string
),
1414 &mnt
->mount_server
.address
,
1415 sizeof(mnt
->mount_server
.address
));
1417 if (mnt
->mount_server
.addrlen
== 0)
1418 goto out_invalid_address
;
1420 case Opt_lookupcache
:
1421 string
= match_strdup(args
);
1424 token
= match_token(string
,
1425 nfs_lookupcache_tokens
, args
);
1428 case Opt_lookupcache_all
:
1429 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1431 case Opt_lookupcache_positive
:
1432 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1433 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1435 case Opt_lookupcache_none
:
1436 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1439 dfprintk(MOUNT
, "NFS: invalid "
1440 "lookupcache argument\n");
1444 case Opt_fscache_uniq
:
1445 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1447 mnt
->options
|= NFS_OPTION_FSCACHE
;
1449 case Opt_local_lock
:
1450 string
= match_strdup(args
);
1453 token
= match_token(string
, nfs_local_lock_tokens
,
1457 case Opt_local_lock_all
:
1458 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1459 NFS_MOUNT_LOCAL_FCNTL
);
1461 case Opt_local_lock_flock
:
1462 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1464 case Opt_local_lock_posix
:
1465 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1467 case Opt_local_lock_none
:
1468 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1469 NFS_MOUNT_LOCAL_FCNTL
);
1472 dfprintk(MOUNT
, "NFS: invalid "
1473 "local_lock argument\n");
1483 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1486 case Opt_deprecated
:
1487 dfprintk(MOUNT
, "NFS: ignoring mount option "
1493 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1498 if (!sloppy
&& invalid_option
)
1502 * verify that any proto=/mountproto= options match the address
1503 * familiies in the addr=/mountaddr= options.
1505 if (protofamily
!= AF_UNSPEC
&&
1506 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1507 goto out_proto_mismatch
;
1509 if (mountfamily
!= AF_UNSPEC
) {
1510 if (mnt
->mount_server
.addrlen
) {
1511 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1512 goto out_mountproto_mismatch
;
1514 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1515 goto out_mountproto_mismatch
;
1521 out_mountproto_mismatch
:
1522 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1526 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1528 out_invalid_address
:
1529 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1532 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1535 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1537 out_security_failure
:
1538 free_secdata(secdata
);
1539 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1544 * Match the requested auth flavors with the list returned by
1545 * the server. Returns zero and sets the mount's authentication
1546 * flavor on success; returns -EACCES if server does not support
1547 * the requested flavor.
1549 static int nfs_walk_authlist(struct nfs_parsed_mount_data
*args
,
1550 struct nfs_mount_request
*request
)
1552 unsigned int i
, j
, server_authlist_len
= *(request
->auth_flav_len
);
1555 * Certain releases of Linux's mountd return an empty
1556 * flavor list. To prevent behavioral regression with
1557 * these servers (ie. rejecting mounts that used to
1558 * succeed), revert to pre-2.6.32 behavior (no checking)
1559 * if the returned flavor list is empty.
1561 if (server_authlist_len
== 0)
1565 * We avoid sophisticated negotiating here, as there are
1566 * plenty of cases where we can get it wrong, providing
1567 * either too little or too much security.
1569 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1570 * flavor listed first. However, some servers list
1571 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1572 * preferred default, in args->auth_flavors[0] if user
1573 * didn't specify sec= mount option.
1575 for (i
= 0; i
< args
->auth_flavor_len
; i
++)
1576 for (j
= 0; j
< server_authlist_len
; j
++)
1577 if (args
->auth_flavors
[i
] == request
->auth_flavs
[j
]) {
1578 dfprintk(MOUNT
, "NFS: using auth flavor %d\n",
1579 request
->auth_flavs
[j
]);
1580 args
->auth_flavors
[0] = request
->auth_flavs
[j
];
1584 dfprintk(MOUNT
, "NFS: server does not support requested auth flavor\n");
1585 nfs_umount(request
);
1590 * Use the remote server's MOUNT service to request the NFS file handle
1591 * corresponding to the provided path.
1593 static int nfs_try_mount(struct nfs_parsed_mount_data
*args
,
1594 struct nfs_fh
*root_fh
)
1596 rpc_authflavor_t server_authlist
[NFS_MAX_SECFLAVORS
];
1597 unsigned int server_authlist_len
= ARRAY_SIZE(server_authlist
);
1598 struct nfs_mount_request request
= {
1599 .sap
= (struct sockaddr
*)
1600 &args
->mount_server
.address
,
1601 .dirpath
= args
->nfs_server
.export_path
,
1602 .protocol
= args
->mount_server
.protocol
,
1604 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1605 .auth_flav_len
= &server_authlist_len
,
1606 .auth_flavs
= server_authlist
,
1610 if (args
->mount_server
.version
== 0) {
1611 switch (args
->version
) {
1613 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1616 args
->mount_server
.version
= NFS_MNT_VERSION
;
1619 request
.version
= args
->mount_server
.version
;
1621 if (args
->mount_server
.hostname
)
1622 request
.hostname
= args
->mount_server
.hostname
;
1624 request
.hostname
= args
->nfs_server
.hostname
;
1627 * Construct the mount server's address.
1629 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1630 memcpy(request
.sap
, &args
->nfs_server
.address
,
1631 args
->nfs_server
.addrlen
);
1632 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1634 request
.salen
= args
->mount_server
.addrlen
;
1635 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1638 * Now ask the mount server to map our export path
1641 status
= nfs_mount(&request
);
1643 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1644 request
.hostname
, status
);
1649 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1651 if (args
->mount_server
.version
!= NFS_MNT3_VERSION
)
1653 return nfs_walk_authlist(args
, &request
);
1657 * Split "dev_name" into "hostname:export_path".
1659 * The leftmost colon demarks the split between the server's hostname
1660 * and the export path. If the hostname starts with a left square
1661 * bracket, then it may contain colons.
1663 * Note: caller frees hostname and export path, even on error.
1665 static int nfs_parse_devname(const char *dev_name
,
1666 char **hostname
, size_t maxnamlen
,
1667 char **export_path
, size_t maxpathlen
)
1672 /* Is the host name protected with square brakcets? */
1673 if (*dev_name
== '[') {
1674 end
= strchr(++dev_name
, ']');
1675 if (end
== NULL
|| end
[1] != ':')
1676 goto out_bad_devname
;
1678 len
= end
- dev_name
;
1683 end
= strchr(dev_name
, ':');
1685 goto out_bad_devname
;
1686 len
= end
- dev_name
;
1688 /* kill possible hostname list: not supported */
1689 comma
= strchr(dev_name
, ',');
1690 if (comma
!= NULL
&& comma
< end
)
1694 if (len
> maxnamlen
)
1697 /* N.B. caller will free nfs_server.hostname in all cases */
1698 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1699 if (*hostname
== NULL
)
1701 len
= strlen(++end
);
1702 if (len
> maxpathlen
)
1704 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1708 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1712 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1716 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1720 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1721 return -ENAMETOOLONG
;
1724 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1725 return -ENAMETOOLONG
;
1729 * Validate the NFS2/NFS3 mount data
1730 * - fills in the mount root filehandle
1732 * For option strings, user space handles the following behaviors:
1734 * + DNS: mapping server host name to IP address ("addr=" option)
1736 * + failure mode: how to behave if a mount request can't be handled
1737 * immediately ("fg/bg" option)
1739 * + retry: how often to retry a mount request ("retry=" option)
1741 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1742 * mountproto=tcp after mountproto=udp, and so on
1744 static int nfs_validate_mount_data(void *options
,
1745 struct nfs_parsed_mount_data
*args
,
1746 struct nfs_fh
*mntfh
,
1747 const char *dev_name
)
1749 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1750 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1755 switch (data
->version
) {
1761 if (data
->flags
& NFS_MOUNT_VER3
)
1763 data
->root
.size
= NFS2_FHSIZE
;
1764 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1766 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1769 memset(data
->context
, 0, sizeof(data
->context
));
1771 if (data
->flags
& NFS_MOUNT_VER3
) {
1772 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1773 goto out_invalid_fh
;
1774 mntfh
->size
= data
->root
.size
;
1777 mntfh
->size
= NFS2_FHSIZE
;
1782 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1783 if (mntfh
->size
< sizeof(mntfh
->data
))
1784 memset(mntfh
->data
+ mntfh
->size
, 0,
1785 sizeof(mntfh
->data
) - mntfh
->size
);
1788 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1791 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1792 args
->flags
|= NFS_MOUNT_LEGACY_INTERFACE
;
1793 args
->rsize
= data
->rsize
;
1794 args
->wsize
= data
->wsize
;
1795 args
->timeo
= data
->timeo
;
1796 args
->retrans
= data
->retrans
;
1797 args
->acregmin
= data
->acregmin
;
1798 args
->acregmax
= data
->acregmax
;
1799 args
->acdirmin
= data
->acdirmin
;
1800 args
->acdirmax
= data
->acdirmax
;
1802 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1803 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1804 if (!nfs_verify_server_address(sap
))
1805 goto out_no_address
;
1807 if (!(data
->flags
& NFS_MOUNT_TCP
))
1808 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1809 /* N.B. caller will free nfs_server.hostname in all cases */
1810 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1811 args
->namlen
= data
->namlen
;
1812 args
->bsize
= data
->bsize
;
1814 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1815 args
->auth_flavors
[0] = data
->pseudoflavor
;
1816 if (!args
->nfs_server
.hostname
)
1819 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1820 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1821 NFS_MOUNT_LOCAL_FCNTL
);
1823 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1824 NFS_MOUNT_LOCAL_FCNTL
);
1826 * The legacy version 6 binary mount data from userspace has a
1827 * field used only to transport selinux information into the
1828 * the kernel. To continue to support that functionality we
1829 * have a touch of selinux knowledge here in the NFS code. The
1830 * userspace code converted context=blah to just blah so we are
1831 * converting back to the full string selinux understands.
1833 if (data
->context
[0]){
1834 #ifdef CONFIG_SECURITY_SELINUX
1836 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1839 strcpy(opts_str
, "context=");
1840 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1841 strcat(opts_str
, &data
->context
[0]);
1842 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1855 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1858 if (!nfs_verify_server_address(sap
))
1859 goto out_no_address
;
1861 if (args
->version
== 4)
1862 #ifdef CONFIG_NFS_V4
1863 return nfs4_validate_text_mount_data(options
,
1866 goto out_v4_not_compiled
;
1869 nfs_set_port(sap
, &args
->nfs_server
.port
, 0);
1871 nfs_set_mount_transport_protocol(args
);
1873 status
= nfs_parse_devname(dev_name
,
1874 &args
->nfs_server
.hostname
,
1876 &args
->nfs_server
.export_path
,
1879 status
= nfs_try_mount(args
, mntfh
);
1881 kfree(args
->nfs_server
.export_path
);
1882 args
->nfs_server
.export_path
= NULL
;
1891 #ifndef CONFIG_NFS_V3
1892 if (args
->version
== 3)
1893 goto out_v3_not_compiled
;
1894 #endif /* !CONFIG_NFS_V3 */
1899 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1903 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1908 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1911 #ifndef CONFIG_NFS_V3
1912 out_v3_not_compiled
:
1913 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1914 return -EPROTONOSUPPORT
;
1915 #endif /* !CONFIG_NFS_V3 */
1917 #ifndef CONFIG_NFS_V4
1918 out_v4_not_compiled
:
1919 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
1920 return -EPROTONOSUPPORT
;
1921 #endif /* !CONFIG_NFS_V4 */
1924 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1928 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1932 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1937 nfs_compare_remount_data(struct nfs_server
*nfss
,
1938 struct nfs_parsed_mount_data
*data
)
1940 if (data
->flags
!= nfss
->flags
||
1941 data
->rsize
!= nfss
->rsize
||
1942 data
->wsize
!= nfss
->wsize
||
1943 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
1944 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
1945 data
->acregmin
!= nfss
->acregmin
/ HZ
||
1946 data
->acregmax
!= nfss
->acregmax
/ HZ
||
1947 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
1948 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
1949 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
1950 data
->nfs_server
.port
!= nfss
->port
||
1951 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
1952 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
1953 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
1960 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
1963 struct nfs_server
*nfss
= sb
->s_fs_info
;
1964 struct nfs_parsed_mount_data
*data
;
1965 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
1966 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
1967 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
1970 * Userspace mount programs that send binary options generally send
1971 * them populated with default values. We have no way to know which
1972 * ones were explicitly specified. Fall back to legacy behavior and
1973 * just return success.
1975 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
1976 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
1977 options
->version
<= 6))))
1980 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
1984 /* fill out struct with values from existing mount */
1985 data
->flags
= nfss
->flags
;
1986 data
->rsize
= nfss
->rsize
;
1987 data
->wsize
= nfss
->wsize
;
1988 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
1989 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
1990 data
->acregmin
= nfss
->acregmin
/ HZ
;
1991 data
->acregmax
= nfss
->acregmax
/ HZ
;
1992 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
1993 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
1994 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
1995 data
->nfs_server
.port
= nfss
->port
;
1996 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
1997 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
1998 data
->nfs_server
.addrlen
);
2000 /* overwrite those values with any that were specified */
2001 error
= nfs_parse_mount_options((char *)options
, data
);
2006 * noac is a special case. It implies -o sync, but that's not
2007 * necessarily reflected in the mtab options. do_remount_sb
2008 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2009 * remount options, so we have to explicitly reset it.
2011 if (data
->flags
& NFS_MOUNT_NOAC
)
2012 *flags
|= MS_SYNCHRONOUS
;
2014 /* compare new mount options with old ones */
2015 error
= nfs_compare_remount_data(nfss
, data
);
2022 * Initialise the common bits of the superblock
2024 static inline void nfs_initialise_sb(struct super_block
*sb
)
2026 struct nfs_server
*server
= NFS_SB(sb
);
2028 sb
->s_magic
= NFS_SUPER_MAGIC
;
2030 /* We probably want something more informative here */
2031 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2032 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2034 if (sb
->s_blocksize
== 0)
2035 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2036 &sb
->s_blocksize_bits
);
2038 if (server
->flags
& NFS_MOUNT_NOAC
)
2039 sb
->s_flags
|= MS_SYNCHRONOUS
;
2041 sb
->s_bdi
= &server
->backing_dev_info
;
2043 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2047 * Finish setting up an NFS2/3 superblock
2049 static void nfs_fill_super(struct super_block
*sb
,
2050 struct nfs_parsed_mount_data
*data
)
2052 struct nfs_server
*server
= NFS_SB(sb
);
2054 sb
->s_blocksize_bits
= 0;
2055 sb
->s_blocksize
= 0;
2057 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2059 if (server
->nfs_client
->rpc_ops
->version
== 3) {
2060 /* The VFS shouldn't apply the umask to mode bits. We will do
2061 * so ourselves when necessary.
2063 sb
->s_flags
|= MS_POSIXACL
;
2064 sb
->s_time_gran
= 1;
2067 sb
->s_op
= &nfs_sops
;
2068 nfs_initialise_sb(sb
);
2072 * Finish setting up a cloned NFS2/3 superblock
2074 static void nfs_clone_super(struct super_block
*sb
,
2075 const struct super_block
*old_sb
)
2077 struct nfs_server
*server
= NFS_SB(sb
);
2079 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2080 sb
->s_blocksize
= old_sb
->s_blocksize
;
2081 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2083 if (server
->nfs_client
->rpc_ops
->version
== 3) {
2084 /* The VFS shouldn't apply the umask to mode bits. We will do
2085 * so ourselves when necessary.
2087 sb
->s_flags
|= MS_POSIXACL
;
2088 sb
->s_time_gran
= 1;
2091 sb
->s_op
= old_sb
->s_op
;
2092 nfs_initialise_sb(sb
);
2095 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2097 const struct nfs_server
*a
= s
->s_fs_info
;
2098 const struct rpc_clnt
*clnt_a
= a
->client
;
2099 const struct rpc_clnt
*clnt_b
= b
->client
;
2101 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2103 if (a
->nfs_client
!= b
->nfs_client
)
2105 if (a
->flags
!= b
->flags
)
2107 if (a
->wsize
!= b
->wsize
)
2109 if (a
->rsize
!= b
->rsize
)
2111 if (a
->acregmin
!= b
->acregmin
)
2113 if (a
->acregmax
!= b
->acregmax
)
2115 if (a
->acdirmin
!= b
->acdirmin
)
2117 if (a
->acdirmax
!= b
->acdirmax
)
2119 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2126 struct nfs_sb_mountdata
{
2127 struct nfs_server
*server
;
2131 static int nfs_set_super(struct super_block
*s
, void *data
)
2133 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2134 struct nfs_server
*server
= sb_mntdata
->server
;
2137 s
->s_flags
= sb_mntdata
->mntflags
;
2138 s
->s_fs_info
= server
;
2139 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2140 ret
= set_anon_super(s
, server
);
2142 server
->s_dev
= s
->s_dev
;
2146 static int nfs_compare_super_address(struct nfs_server
*server1
,
2147 struct nfs_server
*server2
)
2149 struct sockaddr
*sap1
, *sap2
;
2151 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2152 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2154 if (sap1
->sa_family
!= sap2
->sa_family
)
2157 switch (sap1
->sa_family
) {
2159 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2160 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2161 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2163 if (sin1
->sin_port
!= sin2
->sin_port
)
2168 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2169 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2170 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2172 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2183 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2185 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2186 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2187 int mntflags
= sb_mntdata
->mntflags
;
2189 if (!nfs_compare_super_address(old
, server
))
2191 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2192 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2194 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2196 return nfs_compare_mount_options(sb
, server
, mntflags
);
2199 static int nfs_bdi_register(struct nfs_server
*server
)
2201 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2204 static struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2205 int flags
, const char *dev_name
, void *raw_data
)
2207 struct nfs_server
*server
= NULL
;
2208 struct super_block
*s
;
2209 struct nfs_parsed_mount_data
*data
;
2210 struct nfs_fh
*mntfh
;
2211 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2212 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2213 struct nfs_sb_mountdata sb_mntdata
= {
2218 data
= nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION
);
2219 mntfh
= nfs_alloc_fhandle();
2220 if (data
== NULL
|| mntfh
== NULL
)
2223 security_init_mnt_opts(&data
->lsm_opts
);
2225 /* Validate the mount data */
2226 error
= nfs_validate_mount_data(raw_data
, data
, mntfh
, dev_name
);
2228 mntroot
= ERR_PTR(error
);
2232 #ifdef CONFIG_NFS_V4
2233 if (data
->version
== 4) {
2234 mntroot
= nfs4_try_mount(flags
, dev_name
, data
);
2235 kfree(data
->client_address
);
2236 kfree(data
->nfs_server
.export_path
);
2239 #endif /* CONFIG_NFS_V4 */
2241 /* Get a volume representation */
2242 server
= nfs_create_server(data
, mntfh
);
2243 if (IS_ERR(server
)) {
2244 mntroot
= ERR_CAST(server
);
2247 sb_mntdata
.server
= server
;
2249 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2250 compare_super
= NULL
;
2252 /* Get a superblock - note that we may end up sharing one that already exists */
2253 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2255 mntroot
= ERR_CAST(s
);
2259 if (s
->s_fs_info
!= server
) {
2260 nfs_free_server(server
);
2263 error
= nfs_bdi_register(server
);
2265 mntroot
= ERR_PTR(error
);
2266 goto error_splat_bdi
;
2271 /* initial superblock/root creation */
2272 nfs_fill_super(s
, data
);
2273 nfs_fscache_get_super_cookie(s
, data
->fscache_uniq
, NULL
);
2276 mntroot
= nfs_get_root(s
, mntfh
, dev_name
);
2277 if (IS_ERR(mntroot
))
2278 goto error_splat_super
;
2280 error
= security_sb_set_mnt_opts(s
, &data
->lsm_opts
);
2282 goto error_splat_root
;
2284 s
->s_flags
|= MS_ACTIVE
;
2287 kfree(data
->nfs_server
.hostname
);
2288 kfree(data
->mount_server
.hostname
);
2289 kfree(data
->fscache_uniq
);
2290 security_free_mnt_opts(&data
->lsm_opts
);
2292 nfs_free_fhandle(mntfh
);
2297 nfs_free_server(server
);
2302 mntroot
= ERR_PTR(error
);
2304 if (server
&& !s
->s_root
)
2305 bdi_unregister(&server
->backing_dev_info
);
2307 deactivate_locked_super(s
);
2312 * Ensure that we unregister the bdi before kill_anon_super
2313 * releases the device name
2315 static void nfs_put_super(struct super_block
*s
)
2317 struct nfs_server
*server
= NFS_SB(s
);
2319 bdi_unregister(&server
->backing_dev_info
);
2323 * Destroy an NFS2/3 superblock
2325 static void nfs_kill_super(struct super_block
*s
)
2327 struct nfs_server
*server
= NFS_SB(s
);
2330 nfs_fscache_release_super_cookie(s
);
2331 nfs_free_server(server
);
2335 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2337 static struct dentry
*
2338 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2339 const char *dev_name
, void *raw_data
)
2341 struct nfs_clone_mount
*data
= raw_data
;
2342 struct super_block
*s
;
2343 struct nfs_server
*server
;
2344 struct dentry
*mntroot
;
2345 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2346 struct nfs_sb_mountdata sb_mntdata
= {
2351 dprintk("--> nfs_xdev_mount()\n");
2353 /* create a new volume representation */
2354 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
2355 if (IS_ERR(server
)) {
2356 error
= PTR_ERR(server
);
2357 goto out_err_noserver
;
2359 sb_mntdata
.server
= server
;
2361 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2362 compare_super
= NULL
;
2364 /* Get a superblock - note that we may end up sharing one that already exists */
2365 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2371 if (s
->s_fs_info
!= server
) {
2372 nfs_free_server(server
);
2375 error
= nfs_bdi_register(server
);
2377 goto error_splat_bdi
;
2381 /* initial superblock/root creation */
2382 nfs_clone_super(s
, data
->sb
);
2383 nfs_fscache_get_super_cookie(s
, NULL
, data
);
2386 mntroot
= nfs_get_root(s
, data
->fh
, dev_name
);
2387 if (IS_ERR(mntroot
)) {
2388 error
= PTR_ERR(mntroot
);
2389 goto error_splat_super
;
2391 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2394 goto error_splat_super
;
2397 s
->s_flags
|= MS_ACTIVE
;
2399 /* clone any lsm security options from the parent to the new sb */
2400 security_sb_clone_mnt_opts(data
->sb
, s
);
2402 dprintk("<-- nfs_xdev_mount() = 0\n");
2406 nfs_free_server(server
);
2408 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error
);
2409 return ERR_PTR(error
);
2412 if (server
&& !s
->s_root
)
2413 bdi_unregister(&server
->backing_dev_info
);
2415 deactivate_locked_super(s
);
2416 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error
);
2417 return ERR_PTR(error
);
2420 #ifdef CONFIG_NFS_V4
2423 * Finish setting up a cloned NFS4 superblock
2425 static void nfs4_clone_super(struct super_block
*sb
,
2426 const struct super_block
*old_sb
)
2428 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2429 sb
->s_blocksize
= old_sb
->s_blocksize
;
2430 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2431 sb
->s_time_gran
= 1;
2432 sb
->s_op
= old_sb
->s_op
;
2434 * The VFS shouldn't apply the umask to mode bits. We will do
2435 * so ourselves when necessary.
2437 sb
->s_flags
|= MS_POSIXACL
;
2438 sb
->s_xattr
= old_sb
->s_xattr
;
2439 nfs_initialise_sb(sb
);
2443 * Set up an NFS4 superblock
2445 static void nfs4_fill_super(struct super_block
*sb
)
2447 sb
->s_time_gran
= 1;
2448 sb
->s_op
= &nfs4_sops
;
2450 * The VFS shouldn't apply the umask to mode bits. We will do
2451 * so ourselves when necessary.
2453 sb
->s_flags
|= MS_POSIXACL
;
2454 sb
->s_xattr
= nfs4_xattr_handlers
;
2455 nfs_initialise_sb(sb
);
2458 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2460 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2461 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2464 static int nfs4_validate_text_mount_data(void *options
,
2465 struct nfs_parsed_mount_data
*args
,
2466 const char *dev_name
)
2468 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2470 nfs_set_port(sap
, &args
->nfs_server
.port
, NFS_PORT
);
2472 nfs_validate_transport_protocol(args
);
2474 nfs4_validate_mount_flags(args
);
2476 if (args
->version
!= 4) {
2478 "NFS4: Illegal mount version\n");
2482 if (args
->auth_flavor_len
> 1) {
2484 "NFS4: Too many RPC auth flavours specified\n");
2488 if (args
->client_address
== NULL
) {
2490 "NFS4: mount program didn't pass callback address\n");
2494 return nfs_parse_devname(dev_name
,
2495 &args
->nfs_server
.hostname
,
2497 &args
->nfs_server
.export_path
,
2502 * Validate NFSv4 mount options
2504 static int nfs4_validate_mount_data(void *options
,
2505 struct nfs_parsed_mount_data
*args
,
2506 const char *dev_name
)
2508 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2509 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2515 switch (data
->version
) {
2517 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2518 goto out_no_address
;
2519 if (data
->host_addrlen
== 0)
2520 goto out_no_address
;
2521 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2522 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2524 if (!nfs_verify_server_address(sap
))
2525 goto out_no_address
;
2527 if (data
->auth_flavourlen
) {
2528 if (data
->auth_flavourlen
> 1)
2529 goto out_inval_auth
;
2530 if (copy_from_user(&args
->auth_flavors
[0],
2531 data
->auth_flavours
,
2532 sizeof(args
->auth_flavors
[0])))
2536 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2539 args
->nfs_server
.hostname
= c
;
2541 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2544 args
->nfs_server
.export_path
= c
;
2545 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2547 c
= strndup_user(data
->client_addr
.data
, 16);
2550 args
->client_address
= c
;
2553 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2557 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2558 args
->rsize
= data
->rsize
;
2559 args
->wsize
= data
->wsize
;
2560 args
->timeo
= data
->timeo
;
2561 args
->retrans
= data
->retrans
;
2562 args
->acregmin
= data
->acregmin
;
2563 args
->acregmax
= data
->acregmax
;
2564 args
->acdirmin
= data
->acdirmin
;
2565 args
->acdirmax
= data
->acdirmax
;
2566 args
->nfs_server
.protocol
= data
->proto
;
2567 nfs_validate_transport_protocol(args
);
2571 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2574 if (!nfs_verify_server_address(sap
))
2577 return nfs4_validate_text_mount_data(options
, args
, dev_name
);
2583 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2587 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2588 data
->auth_flavourlen
);
2592 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2597 * Get the superblock for the NFS4 root partition
2599 static struct dentry
*
2600 nfs4_remote_mount(struct file_system_type
*fs_type
, int flags
,
2601 const char *dev_name
, void *raw_data
)
2603 struct nfs_parsed_mount_data
*data
= raw_data
;
2604 struct super_block
*s
;
2605 struct nfs_server
*server
;
2606 struct nfs_fh
*mntfh
;
2607 struct dentry
*mntroot
;
2608 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2609 struct nfs_sb_mountdata sb_mntdata
= {
2612 int error
= -ENOMEM
;
2614 mntfh
= nfs_alloc_fhandle();
2615 if (data
== NULL
|| mntfh
== NULL
)
2618 security_init_mnt_opts(&data
->lsm_opts
);
2620 /* Get a volume representation */
2621 server
= nfs4_create_server(data
, mntfh
);
2622 if (IS_ERR(server
)) {
2623 error
= PTR_ERR(server
);
2626 sb_mntdata
.server
= server
;
2628 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2629 compare_super
= NULL
;
2631 /* Get a superblock - note that we may end up sharing one that already exists */
2632 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2638 if (s
->s_fs_info
!= server
) {
2639 nfs_free_server(server
);
2642 error
= nfs_bdi_register(server
);
2644 goto error_splat_bdi
;
2648 /* initial superblock/root creation */
2650 nfs_fscache_get_super_cookie(
2651 s
, data
? data
->fscache_uniq
: NULL
, NULL
);
2654 mntroot
= nfs4_get_root(s
, mntfh
, dev_name
);
2655 if (IS_ERR(mntroot
)) {
2656 error
= PTR_ERR(mntroot
);
2657 goto error_splat_super
;
2660 error
= security_sb_set_mnt_opts(s
, &data
->lsm_opts
);
2662 goto error_splat_root
;
2664 s
->s_flags
|= MS_ACTIVE
;
2666 security_free_mnt_opts(&data
->lsm_opts
);
2667 nfs_free_fhandle(mntfh
);
2671 security_free_mnt_opts(&data
->lsm_opts
);
2673 nfs_free_fhandle(mntfh
);
2674 return ERR_PTR(error
);
2677 nfs_free_server(server
);
2683 if (server
&& !s
->s_root
)
2684 bdi_unregister(&server
->backing_dev_info
);
2686 deactivate_locked_super(s
);
2690 static struct vfsmount
*nfs_do_root_mount(struct file_system_type
*fs_type
,
2691 int flags
, void *data
, const char *hostname
)
2693 struct vfsmount
*root_mnt
;
2697 len
= strlen(hostname
) + 3;
2698 root_devname
= kmalloc(len
, GFP_KERNEL
);
2699 if (root_devname
== NULL
)
2700 return ERR_PTR(-ENOMEM
);
2701 snprintf(root_devname
, len
, "%s:/", hostname
);
2702 root_mnt
= vfs_kern_mount(fs_type
, flags
, root_devname
, data
);
2703 kfree(root_devname
);
2707 struct nfs_referral_count
{
2708 struct list_head list
;
2709 const struct task_struct
*task
;
2710 unsigned int referral_count
;
2713 static LIST_HEAD(nfs_referral_count_list
);
2714 static DEFINE_SPINLOCK(nfs_referral_count_list_lock
);
2716 static struct nfs_referral_count
*nfs_find_referral_count(void)
2718 struct nfs_referral_count
*p
;
2720 list_for_each_entry(p
, &nfs_referral_count_list
, list
) {
2721 if (p
->task
== current
)
2727 #define NFS_MAX_NESTED_REFERRALS 2
2729 static int nfs_referral_loop_protect(void)
2731 struct nfs_referral_count
*p
, *new;
2734 new = kmalloc(sizeof(*new), GFP_KERNEL
);
2737 new->task
= current
;
2738 new->referral_count
= 1;
2741 spin_lock(&nfs_referral_count_list_lock
);
2742 p
= nfs_find_referral_count();
2744 if (p
->referral_count
>= NFS_MAX_NESTED_REFERRALS
)
2747 p
->referral_count
++;
2749 list_add(&new->list
, &nfs_referral_count_list
);
2752 spin_unlock(&nfs_referral_count_list_lock
);
2758 static void nfs_referral_loop_unprotect(void)
2760 struct nfs_referral_count
*p
;
2762 spin_lock(&nfs_referral_count_list_lock
);
2763 p
= nfs_find_referral_count();
2764 p
->referral_count
--;
2765 if (p
->referral_count
== 0)
2769 spin_unlock(&nfs_referral_count_list_lock
);
2773 static struct dentry
*nfs_follow_remote_path(struct vfsmount
*root_mnt
,
2774 const char *export_path
)
2776 struct nameidata
*nd
= NULL
;
2777 struct mnt_namespace
*ns_private
;
2778 struct super_block
*s
;
2779 struct dentry
*dentry
;
2782 nd
= kmalloc(sizeof(*nd
), GFP_KERNEL
);
2784 return ERR_PTR(-ENOMEM
);
2786 ns_private
= create_mnt_ns(root_mnt
);
2787 ret
= PTR_ERR(ns_private
);
2788 if (IS_ERR(ns_private
))
2791 ret
= nfs_referral_loop_protect();
2793 goto out_put_mnt_ns
;
2795 ret
= vfs_path_lookup(root_mnt
->mnt_root
, root_mnt
,
2796 export_path
, LOOKUP_FOLLOW
, nd
);
2798 nfs_referral_loop_unprotect();
2799 put_mnt_ns(ns_private
);
2804 s
= nd
->path
.mnt
->mnt_sb
;
2805 atomic_inc(&s
->s_active
);
2806 dentry
= dget(nd
->path
.dentry
);
2808 path_put(&nd
->path
);
2810 down_write(&s
->s_umount
);
2813 put_mnt_ns(ns_private
);
2818 return ERR_PTR(ret
);
2821 static struct dentry
*nfs4_try_mount(int flags
, const char *dev_name
,
2822 struct nfs_parsed_mount_data
*data
)
2825 struct vfsmount
*root_mnt
;
2828 dfprintk(MOUNT
, "--> nfs4_try_mount()\n");
2830 export_path
= data
->nfs_server
.export_path
;
2831 data
->nfs_server
.export_path
= "/";
2832 root_mnt
= nfs_do_root_mount(&nfs4_remote_fs_type
, flags
, data
,
2833 data
->nfs_server
.hostname
);
2834 data
->nfs_server
.export_path
= export_path
;
2836 res
= ERR_CAST(root_mnt
);
2837 if (!IS_ERR(root_mnt
))
2838 res
= nfs_follow_remote_path(root_mnt
, export_path
);
2840 dfprintk(MOUNT
, "<-- nfs4_try_mount() = %ld%s\n",
2841 IS_ERR(res
) ? PTR_ERR(res
) : 0,
2842 IS_ERR(res
) ? " [error]" : "");
2847 * Get the superblock for an NFS4 mountpoint
2849 static struct dentry
*nfs4_mount(struct file_system_type
*fs_type
,
2850 int flags
, const char *dev_name
, void *raw_data
)
2852 struct nfs_parsed_mount_data
*data
;
2853 int error
= -ENOMEM
;
2854 struct dentry
*res
= ERR_PTR(-ENOMEM
);
2856 data
= nfs_alloc_parsed_mount_data(4);
2860 /* Validate the mount data */
2861 error
= nfs4_validate_mount_data(raw_data
, data
, dev_name
);
2863 res
= ERR_PTR(error
);
2867 res
= nfs4_try_mount(flags
, dev_name
, data
);
2869 error
= PTR_ERR(res
);
2872 kfree(data
->client_address
);
2873 kfree(data
->nfs_server
.export_path
);
2874 kfree(data
->nfs_server
.hostname
);
2875 kfree(data
->fscache_uniq
);
2878 dprintk("<-- nfs4_mount() = %d%s\n", error
,
2879 error
!= 0 ? " [error]" : "");
2883 static void nfs4_kill_super(struct super_block
*sb
)
2885 struct nfs_server
*server
= NFS_SB(sb
);
2887 dprintk("--> %s\n", __func__
);
2888 nfs_super_return_all_delegations(sb
);
2889 kill_anon_super(sb
);
2890 nfs_fscache_release_super_cookie(sb
);
2891 nfs_free_server(server
);
2892 dprintk("<-- %s\n", __func__
);
2896 * Clone an NFS4 server record on xdev traversal (FSID-change)
2898 static struct dentry
*
2899 nfs4_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2900 const char *dev_name
, void *raw_data
)
2902 struct nfs_clone_mount
*data
= raw_data
;
2903 struct super_block
*s
;
2904 struct nfs_server
*server
;
2905 struct dentry
*mntroot
;
2906 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2907 struct nfs_sb_mountdata sb_mntdata
= {
2912 dprintk("--> nfs4_xdev_mount()\n");
2914 /* create a new volume representation */
2915 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
2916 if (IS_ERR(server
)) {
2917 error
= PTR_ERR(server
);
2918 goto out_err_noserver
;
2920 sb_mntdata
.server
= server
;
2922 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2923 compare_super
= NULL
;
2925 /* Get a superblock - note that we may end up sharing one that already exists */
2926 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2932 if (s
->s_fs_info
!= server
) {
2933 nfs_free_server(server
);
2936 error
= nfs_bdi_register(server
);
2938 goto error_splat_bdi
;
2942 /* initial superblock/root creation */
2943 nfs4_clone_super(s
, data
->sb
);
2944 nfs_fscache_get_super_cookie(s
, NULL
, data
);
2947 mntroot
= nfs4_get_root(s
, data
->fh
, dev_name
);
2948 if (IS_ERR(mntroot
)) {
2949 error
= PTR_ERR(mntroot
);
2950 goto error_splat_super
;
2952 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2955 goto error_splat_super
;
2958 s
->s_flags
|= MS_ACTIVE
;
2960 security_sb_clone_mnt_opts(data
->sb
, s
);
2962 dprintk("<-- nfs4_xdev_mount() = 0\n");
2966 nfs_free_server(server
);
2968 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error
);
2969 return ERR_PTR(error
);
2972 if (server
&& !s
->s_root
)
2973 bdi_unregister(&server
->backing_dev_info
);
2975 deactivate_locked_super(s
);
2976 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error
);
2977 return ERR_PTR(error
);
2980 static struct dentry
*
2981 nfs4_remote_referral_mount(struct file_system_type
*fs_type
, int flags
,
2982 const char *dev_name
, void *raw_data
)
2984 struct nfs_clone_mount
*data
= raw_data
;
2985 struct super_block
*s
;
2986 struct nfs_server
*server
;
2987 struct dentry
*mntroot
;
2988 struct nfs_fh
*mntfh
;
2989 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2990 struct nfs_sb_mountdata sb_mntdata
= {
2993 int error
= -ENOMEM
;
2995 dprintk("--> nfs4_referral_get_sb()\n");
2997 mntfh
= nfs_alloc_fhandle();
3001 /* create a new volume representation */
3002 server
= nfs4_create_referral_server(data
, mntfh
);
3003 if (IS_ERR(server
)) {
3004 error
= PTR_ERR(server
);
3005 goto out_err_noserver
;
3007 sb_mntdata
.server
= server
;
3009 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
3010 compare_super
= NULL
;
3012 /* Get a superblock - note that we may end up sharing one that already exists */
3013 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
3019 if (s
->s_fs_info
!= server
) {
3020 nfs_free_server(server
);
3023 error
= nfs_bdi_register(server
);
3025 goto error_splat_bdi
;
3029 /* initial superblock/root creation */
3031 nfs_fscache_get_super_cookie(s
, NULL
, data
);
3034 mntroot
= nfs4_get_root(s
, mntfh
, dev_name
);
3035 if (IS_ERR(mntroot
)) {
3036 error
= PTR_ERR(mntroot
);
3037 goto error_splat_super
;
3039 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
3042 goto error_splat_super
;
3045 s
->s_flags
|= MS_ACTIVE
;
3047 security_sb_clone_mnt_opts(data
->sb
, s
);
3049 nfs_free_fhandle(mntfh
);
3050 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3054 nfs_free_server(server
);
3056 nfs_free_fhandle(mntfh
);
3058 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
3059 return ERR_PTR(error
);
3062 if (server
&& !s
->s_root
)
3063 bdi_unregister(&server
->backing_dev_info
);
3065 deactivate_locked_super(s
);
3066 nfs_free_fhandle(mntfh
);
3067 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
3068 return ERR_PTR(error
);
3072 * Create an NFS4 server record on referral traversal
3074 static struct dentry
*nfs4_referral_mount(struct file_system_type
*fs_type
,
3075 int flags
, const char *dev_name
, void *raw_data
)
3077 struct nfs_clone_mount
*data
= raw_data
;
3079 struct vfsmount
*root_mnt
;
3082 dprintk("--> nfs4_referral_mount()\n");
3084 export_path
= data
->mnt_path
;
3085 data
->mnt_path
= "/";
3087 root_mnt
= nfs_do_root_mount(&nfs4_remote_referral_fs_type
,
3088 flags
, data
, data
->hostname
);
3089 data
->mnt_path
= export_path
;
3091 res
= ERR_CAST(root_mnt
);
3092 if (!IS_ERR(root_mnt
))
3093 res
= nfs_follow_remote_path(root_mnt
, export_path
);
3094 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3095 IS_ERR(res
) ? PTR_ERR(res
) : 0,
3096 IS_ERR(res
) ? " [error]" : "");
3100 #endif /* CONFIG_NFS_V4 */