4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/namei.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
49 #include <linux/slab.h>
51 #include <linux/netdevice.h>
52 #include <linux/nfs_xdr.h>
53 #include <linux/magic.h>
54 #include <linux/parser.h>
55 #include <linux/nsproxy.h>
56 #include <linux/rcupdate.h>
58 #include <asm/uaccess.h>
62 #include "delegation.h"
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_udp
, Opt_tcp
, Opt_rdma
,
85 Opt_rdirplus
, Opt_nordirplus
,
86 Opt_sharecache
, Opt_nosharecache
,
87 Opt_resvport
, Opt_noresvport
,
88 Opt_fscache
, Opt_nofscache
,
90 /* Mount options that take integer arguments */
92 Opt_rsize
, Opt_wsize
, Opt_bsize
,
93 Opt_timeo
, Opt_retrans
,
94 Opt_acregmin
, Opt_acregmax
,
95 Opt_acdirmin
, Opt_acdirmax
,
102 /* Mount options that take string arguments */
104 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
105 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
110 /* Special mount options */
111 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
116 static const match_table_t nfs_mount_option_tokens
= {
117 { Opt_userspace
, "bg" },
118 { Opt_userspace
, "fg" },
119 { Opt_userspace
, "retry=%s" },
121 { Opt_sloppy
, "sloppy" },
123 { Opt_soft
, "soft" },
124 { Opt_hard
, "hard" },
125 { Opt_deprecated
, "intr" },
126 { Opt_deprecated
, "nointr" },
127 { Opt_posix
, "posix" },
128 { Opt_noposix
, "noposix" },
130 { Opt_nocto
, "nocto" },
132 { Opt_noac
, "noac" },
133 { Opt_lock
, "lock" },
134 { Opt_nolock
, "nolock" },
137 { Opt_rdma
, "rdma" },
139 { Opt_noacl
, "noacl" },
140 { Opt_rdirplus
, "rdirplus" },
141 { Opt_nordirplus
, "nordirplus" },
142 { Opt_sharecache
, "sharecache" },
143 { Opt_nosharecache
, "nosharecache" },
144 { Opt_resvport
, "resvport" },
145 { Opt_noresvport
, "noresvport" },
146 { Opt_fscache
, "fsc" },
147 { Opt_nofscache
, "nofsc" },
149 { Opt_port
, "port=%s" },
150 { Opt_rsize
, "rsize=%s" },
151 { Opt_wsize
, "wsize=%s" },
152 { Opt_bsize
, "bsize=%s" },
153 { Opt_timeo
, "timeo=%s" },
154 { Opt_retrans
, "retrans=%s" },
155 { Opt_acregmin
, "acregmin=%s" },
156 { Opt_acregmax
, "acregmax=%s" },
157 { Opt_acdirmin
, "acdirmin=%s" },
158 { Opt_acdirmax
, "acdirmax=%s" },
159 { Opt_actimeo
, "actimeo=%s" },
160 { Opt_namelen
, "namlen=%s" },
161 { Opt_mountport
, "mountport=%s" },
162 { Opt_mountvers
, "mountvers=%s" },
163 { Opt_minorversion
, "minorversion=%s" },
165 { Opt_nfsvers
, "nfsvers=%s" },
166 { Opt_nfsvers
, "vers=%s" },
168 { Opt_sec
, "sec=%s" },
169 { Opt_proto
, "proto=%s" },
170 { Opt_mountproto
, "mountproto=%s" },
171 { Opt_addr
, "addr=%s" },
172 { Opt_clientaddr
, "clientaddr=%s" },
173 { Opt_mounthost
, "mounthost=%s" },
174 { Opt_mountaddr
, "mountaddr=%s" },
176 { Opt_lookupcache
, "lookupcache=%s" },
177 { Opt_fscache_uniq
, "fsc=%s" },
178 { Opt_local_lock
, "local_lock=%s" },
180 /* The following needs to be listed after all other options */
181 { Opt_nfsvers
, "v%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 Opt_vers_2
, Opt_vers_3
, Opt_vers_4
, Opt_vers_4_0
,
270 static match_table_t nfs_vers_tokens
= {
274 { Opt_vers_4_0
, "4.0" },
275 { Opt_vers_4_1
, "4.1" },
277 { Opt_vers_err
, NULL
}
280 static void nfs_umount_begin(struct super_block
*);
281 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
282 static int nfs_show_options(struct seq_file
*, struct dentry
*);
283 static int nfs_show_devname(struct seq_file
*, struct dentry
*);
284 static int nfs_show_path(struct seq_file
*, struct dentry
*);
285 static int nfs_show_stats(struct seq_file
*, struct dentry
*);
286 static struct dentry
*nfs_fs_mount(struct file_system_type
*,
287 int, const char *, void *);
288 static struct dentry
*nfs_xdev_mount(struct file_system_type
*fs_type
,
289 int flags
, const char *dev_name
, void *raw_data
);
290 static void nfs_put_super(struct super_block
*);
291 static void nfs_kill_super(struct super_block
*);
292 static int nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
);
294 static struct file_system_type nfs_fs_type
= {
295 .owner
= THIS_MODULE
,
297 .mount
= nfs_fs_mount
,
298 .kill_sb
= nfs_kill_super
,
299 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
302 struct file_system_type nfs_xdev_fs_type
= {
303 .owner
= THIS_MODULE
,
305 .mount
= nfs_xdev_mount
,
306 .kill_sb
= nfs_kill_super
,
307 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
310 static const struct super_operations nfs_sops
= {
311 .alloc_inode
= nfs_alloc_inode
,
312 .destroy_inode
= nfs_destroy_inode
,
313 .write_inode
= nfs_write_inode
,
314 .put_super
= nfs_put_super
,
315 .statfs
= nfs_statfs
,
316 .evict_inode
= nfs_evict_inode
,
317 .umount_begin
= nfs_umount_begin
,
318 .show_options
= nfs_show_options
,
319 .show_devname
= nfs_show_devname
,
320 .show_path
= nfs_show_path
,
321 .show_stats
= nfs_show_stats
,
322 .remount_fs
= nfs_remount
,
326 static int nfs4_validate_text_mount_data(void *options
,
327 struct nfs_parsed_mount_data
*args
, const char *dev_name
);
328 static struct dentry
*nfs4_try_mount(int flags
, const char *dev_name
,
329 struct nfs_parsed_mount_data
*data
);
330 static struct dentry
*nfs4_mount(struct file_system_type
*fs_type
,
331 int flags
, const char *dev_name
, void *raw_data
);
332 static struct dentry
*nfs4_remote_mount(struct file_system_type
*fs_type
,
333 int flags
, const char *dev_name
, void *raw_data
);
334 static struct dentry
*nfs4_xdev_mount(struct file_system_type
*fs_type
,
335 int flags
, const char *dev_name
, void *raw_data
);
336 static struct dentry
*nfs4_referral_mount(struct file_system_type
*fs_type
,
337 int flags
, const char *dev_name
, void *raw_data
);
338 static struct dentry
*nfs4_remote_referral_mount(struct file_system_type
*fs_type
,
339 int flags
, const char *dev_name
, void *raw_data
);
340 static void nfs4_kill_super(struct super_block
*sb
);
342 static struct file_system_type nfs4_fs_type
= {
343 .owner
= THIS_MODULE
,
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_fs_type
= {
351 .owner
= THIS_MODULE
,
353 .mount
= nfs4_remote_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_xdev_fs_type
= {
359 .owner
= THIS_MODULE
,
361 .mount
= nfs4_xdev_mount
,
362 .kill_sb
= nfs4_kill_super
,
363 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
366 static struct file_system_type nfs4_remote_referral_fs_type
= {
367 .owner
= THIS_MODULE
,
369 .mount
= nfs4_remote_referral_mount
,
370 .kill_sb
= nfs4_kill_super
,
371 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
374 struct file_system_type nfs4_referral_fs_type
= {
375 .owner
= THIS_MODULE
,
377 .mount
= nfs4_referral_mount
,
378 .kill_sb
= nfs4_kill_super
,
379 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
382 static const struct super_operations nfs4_sops
= {
383 .alloc_inode
= nfs_alloc_inode
,
384 .destroy_inode
= nfs_destroy_inode
,
385 .write_inode
= nfs_write_inode
,
386 .put_super
= nfs_put_super
,
387 .statfs
= nfs_statfs
,
388 .evict_inode
= nfs4_evict_inode
,
389 .umount_begin
= nfs_umount_begin
,
390 .show_options
= nfs_show_options
,
391 .show_devname
= nfs_show_devname
,
392 .show_path
= nfs_show_path
,
393 .show_stats
= nfs_show_stats
,
394 .remount_fs
= nfs_remount
,
398 static struct shrinker acl_shrinker
= {
399 .shrink
= nfs_access_cache_shrinker
,
400 .seeks
= DEFAULT_SEEKS
,
404 * Register the NFS filesystems
406 int __init
register_nfs_fs(void)
410 ret
= register_filesystem(&nfs_fs_type
);
414 ret
= nfs_register_sysctl();
418 ret
= register_filesystem(&nfs4_fs_type
);
422 register_shrinker(&acl_shrinker
);
427 nfs_unregister_sysctl();
430 unregister_filesystem(&nfs_fs_type
);
436 * Unregister the NFS filesystems
438 void __exit
unregister_nfs_fs(void)
440 unregister_shrinker(&acl_shrinker
);
442 unregister_filesystem(&nfs4_fs_type
);
444 nfs_unregister_sysctl();
445 unregister_filesystem(&nfs_fs_type
);
448 void nfs_sb_active(struct super_block
*sb
)
450 struct nfs_server
*server
= NFS_SB(sb
);
452 if (atomic_inc_return(&server
->active
) == 1)
453 atomic_inc(&sb
->s_active
);
456 void nfs_sb_deactive(struct super_block
*sb
)
458 struct nfs_server
*server
= NFS_SB(sb
);
460 if (atomic_dec_and_test(&server
->active
))
461 deactivate_super(sb
);
465 * Deliver file system statistics to userspace
467 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
469 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
470 unsigned char blockbits
;
471 unsigned long blockres
;
472 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
473 struct nfs_fsstat res
;
476 res
.fattr
= nfs_alloc_fattr();
477 if (res
.fattr
== NULL
)
480 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
481 if (unlikely(error
== -ESTALE
)) {
482 struct dentry
*pd_dentry
;
484 pd_dentry
= dget_parent(dentry
);
485 if (pd_dentry
!= NULL
) {
486 nfs_zap_caches(pd_dentry
->d_inode
);
490 nfs_free_fattr(res
.fattr
);
494 buf
->f_type
= NFS_SUPER_MAGIC
;
497 * Current versions of glibc do not correctly handle the
498 * case where f_frsize != f_bsize. Eventually we want to
499 * report the value of wtmult in this field.
501 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
504 * On most *nix systems, f_blocks, f_bfree, and f_bavail
505 * are reported in units of f_frsize. Linux hasn't had
506 * an f_frsize field in its statfs struct until recently,
507 * thus historically Linux's sys_statfs reports these
508 * fields in units of f_bsize.
510 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
511 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
512 blockres
= (1 << blockbits
) - 1;
513 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
514 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
515 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
517 buf
->f_files
= res
.tfiles
;
518 buf
->f_ffree
= res
.afiles
;
520 buf
->f_namelen
= server
->namelen
;
525 dprintk("%s: statfs error = %d\n", __func__
, -error
);
530 * Map the security flavour number to a name
532 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
534 static const struct {
535 rpc_authflavor_t flavour
;
538 { RPC_AUTH_NULL
, "null" },
539 { RPC_AUTH_UNIX
, "sys" },
540 { RPC_AUTH_GSS_KRB5
, "krb5" },
541 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
542 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
543 { RPC_AUTH_GSS_LKEY
, "lkey" },
544 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
545 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
546 { RPC_AUTH_GSS_SPKM
, "spkm" },
547 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
548 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
549 { UINT_MAX
, "unknown" }
553 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
554 if (sec_flavours
[i
].flavour
== flavour
)
557 return sec_flavours
[i
].str
;
560 static void nfs_show_mountd_netid(struct seq_file
*m
, struct nfs_server
*nfss
,
563 struct sockaddr
*sap
= (struct sockaddr
*) &nfss
->mountd_address
;
565 seq_printf(m
, ",mountproto=");
566 switch (sap
->sa_family
) {
568 switch (nfss
->mountd_protocol
) {
570 seq_printf(m
, RPCBIND_NETID_UDP
);
573 seq_printf(m
, RPCBIND_NETID_TCP
);
577 seq_printf(m
, "auto");
581 switch (nfss
->mountd_protocol
) {
583 seq_printf(m
, RPCBIND_NETID_UDP6
);
586 seq_printf(m
, RPCBIND_NETID_TCP6
);
590 seq_printf(m
, "auto");
595 seq_printf(m
, "auto");
599 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
602 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
604 if (nfss
->flags
& NFS_MOUNT_LEGACY_INTERFACE
)
607 switch (sap
->sa_family
) {
609 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
610 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
614 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
615 seq_printf(m
, ",mountaddr=%pI6c", &sin6
->sin6_addr
);
620 seq_printf(m
, ",mountaddr=unspecified");
623 if (nfss
->mountd_version
|| showdefaults
)
624 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
625 if ((nfss
->mountd_port
&&
626 nfss
->mountd_port
!= (unsigned short)NFS_UNSPEC_PORT
) ||
628 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
630 nfs_show_mountd_netid(m
, nfss
, showdefaults
);
634 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
637 struct nfs_client
*clp
= nfss
->nfs_client
;
639 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
642 static void nfs_show_nfsv4_options(struct seq_file
*m
, struct nfs_server
*nfss
,
648 static void nfs_show_nfs_version(struct seq_file
*m
,
649 unsigned int version
,
650 unsigned int minorversion
)
652 seq_printf(m
, ",vers=%u", version
);
654 seq_printf(m
, ".%u", minorversion
);
658 * Describe the mount options in force on this server representation
660 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
663 static const struct proc_nfs_info
{
668 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
669 { NFS_MOUNT_POSIX
, ",posix", "" },
670 { NFS_MOUNT_NOCTO
, ",nocto", "" },
671 { NFS_MOUNT_NOAC
, ",noac", "" },
672 { NFS_MOUNT_NONLM
, ",nolock", "" },
673 { NFS_MOUNT_NOACL
, ",noacl", "" },
674 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
675 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
676 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
679 const struct proc_nfs_info
*nfs_infop
;
680 struct nfs_client
*clp
= nfss
->nfs_client
;
681 u32 version
= clp
->rpc_ops
->version
;
682 int local_flock
, local_fcntl
;
684 nfs_show_nfs_version(m
, version
, clp
->cl_minorversion
);
685 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
686 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
687 if (nfss
->bsize
!= 0)
688 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
689 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
690 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
691 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
692 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
693 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
694 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
695 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
696 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
697 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
698 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
699 if (nfss
->flags
& nfs_infop
->flag
)
700 seq_puts(m
, nfs_infop
->str
);
702 seq_puts(m
, nfs_infop
->nostr
);
705 seq_printf(m
, ",proto=%s",
706 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_NETID
));
709 if (nfss
->port
!= NFS_PORT
)
710 seq_printf(m
, ",port=%u", nfss
->port
);
713 seq_printf(m
, ",port=%u", nfss
->port
);
715 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
716 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
717 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
720 nfs_show_mountd_options(m
, nfss
, showdefaults
);
722 nfs_show_nfsv4_options(m
, nfss
, showdefaults
);
724 if (nfss
->options
& NFS_OPTION_FSCACHE
)
725 seq_printf(m
, ",fsc");
727 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONEG
) {
728 if (nfss
->flags
& NFS_MOUNT_LOOKUP_CACHE_NONE
)
729 seq_printf(m
, ",lookupcache=none");
731 seq_printf(m
, ",lookupcache=pos");
734 local_flock
= nfss
->flags
& NFS_MOUNT_LOCAL_FLOCK
;
735 local_fcntl
= nfss
->flags
& NFS_MOUNT_LOCAL_FCNTL
;
737 if (!local_flock
&& !local_fcntl
)
738 seq_printf(m
, ",local_lock=none");
739 else if (local_flock
&& local_fcntl
)
740 seq_printf(m
, ",local_lock=all");
741 else if (local_flock
)
742 seq_printf(m
, ",local_lock=flock");
744 seq_printf(m
, ",local_lock=posix");
748 * Describe the mount options on this VFS mountpoint
750 static int nfs_show_options(struct seq_file
*m
, struct dentry
*root
)
752 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
754 nfs_show_mount_options(m
, nfss
, 0);
757 seq_printf(m
, ",addr=%s",
758 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
766 #ifdef CONFIG_NFS_V4_1
767 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
)
769 if (nfs4_has_session(server
->nfs_client
))
770 seq_printf(m
, ",sessions");
773 static void show_sessions(struct seq_file
*m
, struct nfs_server
*server
) {}
777 #ifdef CONFIG_NFS_V4_1
778 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
780 seq_printf(m
, ",pnfs=");
781 if (server
->pnfs_curr_ld
)
782 seq_printf(m
, "%s", server
->pnfs_curr_ld
->name
);
784 seq_printf(m
, "not configured");
787 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
789 if (nfss
->nfs_client
&& nfss
->nfs_client
->impl_id
) {
790 struct nfs41_impl_id
*impl_id
= nfss
->nfs_client
->impl_id
;
791 seq_printf(m
, "\n\timpl_id:\tname='%s',domain='%s',"
793 impl_id
->name
, impl_id
->domain
,
794 impl_id
->date
.seconds
, impl_id
->date
.nseconds
);
799 static void show_pnfs(struct seq_file
*m
, struct nfs_server
*server
)
803 static void show_implementation_id(struct seq_file
*m
, struct nfs_server
*nfss
)
808 static int nfs_show_devname(struct seq_file
*m
, struct dentry
*root
)
810 char *page
= (char *) __get_free_page(GFP_KERNEL
);
811 char *devname
, *dummy
;
815 devname
= nfs_path(&dummy
, root
, page
, PAGE_SIZE
);
817 err
= PTR_ERR(devname
);
819 seq_escape(m
, devname
, " \t\n\\");
820 free_page((unsigned long)page
);
824 static int nfs_show_path(struct seq_file
*m
, struct dentry
*dentry
)
831 * Present statistical information for this VFS mountpoint
833 static int nfs_show_stats(struct seq_file
*m
, struct dentry
*root
)
836 struct nfs_server
*nfss
= NFS_SB(root
->d_sb
);
837 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
838 struct nfs_iostats totals
= { };
840 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
843 * Display all mount option settings
845 seq_printf(m
, "\n\topts:\t");
846 seq_puts(m
, root
->d_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
847 seq_puts(m
, root
->d_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
848 seq_puts(m
, root
->d_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
849 seq_puts(m
, root
->d_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
850 nfs_show_mount_options(m
, nfss
, 1);
852 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
854 show_implementation_id(m
, nfss
);
856 seq_printf(m
, "\n\tcaps:\t");
857 seq_printf(m
, "caps=0x%x", nfss
->caps
);
858 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
859 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
860 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
861 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
864 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
865 seq_printf(m
, "\n\tnfsv4:\t");
866 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
867 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
868 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
869 show_sessions(m
, nfss
);
875 * Display security flavor in effect for this mount
877 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
879 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
882 * Display superblock I/O counters
884 for_each_possible_cpu(cpu
) {
885 struct nfs_iostats
*stats
;
888 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
890 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
891 totals
.events
[i
] += stats
->events
[i
];
892 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
893 totals
.bytes
[i
] += stats
->bytes
[i
];
894 #ifdef CONFIG_NFS_FSCACHE
895 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
896 totals
.fscache
[i
] += stats
->fscache
[i
];
902 seq_printf(m
, "\n\tevents:\t");
903 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
904 seq_printf(m
, "%lu ", totals
.events
[i
]);
905 seq_printf(m
, "\n\tbytes:\t");
906 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
907 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
908 #ifdef CONFIG_NFS_FSCACHE
909 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
910 seq_printf(m
, "\n\tfsc:\t");
911 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
912 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
917 rpc_print_iostats(m
, nfss
->client
);
923 * Begin unmount by attempting to remove all automounted mountpoints we added
924 * in response to xdev traversals and referrals
926 static void nfs_umount_begin(struct super_block
*sb
)
928 struct nfs_server
*server
;
929 struct rpc_clnt
*rpc
;
932 /* -EIO all pending I/O */
933 rpc
= server
->client_acl
;
935 rpc_killall_tasks(rpc
);
936 rpc
= server
->client
;
938 rpc_killall_tasks(rpc
);
941 static struct nfs_parsed_mount_data
*nfs_alloc_parsed_mount_data(unsigned int version
)
943 struct nfs_parsed_mount_data
*data
;
945 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
947 data
->acregmin
= NFS_DEF_ACREGMIN
;
948 data
->acregmax
= NFS_DEF_ACREGMAX
;
949 data
->acdirmin
= NFS_DEF_ACDIRMIN
;
950 data
->acdirmax
= NFS_DEF_ACDIRMAX
;
951 data
->mount_server
.port
= NFS_UNSPEC_PORT
;
952 data
->nfs_server
.port
= NFS_UNSPEC_PORT
;
953 data
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
954 data
->auth_flavors
[0] = RPC_AUTH_UNIX
;
955 data
->auth_flavor_len
= 1;
956 data
->version
= version
;
957 data
->minorversion
= 0;
958 data
->net
= current
->nsproxy
->net_ns
;
959 security_init_mnt_opts(&data
->lsm_opts
);
964 static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data
*data
)
967 kfree(data
->client_address
);
968 kfree(data
->mount_server
.hostname
);
969 kfree(data
->nfs_server
.export_path
);
970 kfree(data
->nfs_server
.hostname
);
971 kfree(data
->fscache_uniq
);
972 security_free_mnt_opts(&data
->lsm_opts
);
978 * Sanity-check a server address provided by the mount command.
980 * Address family must be initialized, and address must not be
981 * the ANY address for that family.
983 static int nfs_verify_server_address(struct sockaddr
*addr
)
985 switch (addr
->sa_family
) {
987 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
988 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
991 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
992 return !ipv6_addr_any(sa
);
996 dfprintk(MOUNT
, "NFS: Invalid IP address specified\n");
1001 * Select between a default port value and a user-specified port value.
1002 * If a zero value is set, then autobind will be used.
1004 static void nfs_set_port(struct sockaddr
*sap
, int *port
,
1005 const unsigned short default_port
)
1007 if (*port
== NFS_UNSPEC_PORT
)
1008 *port
= default_port
;
1010 rpc_set_port(sap
, *port
);
1014 * Sanity check the NFS transport protocol.
1017 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
1019 switch (mnt
->nfs_server
.protocol
) {
1020 case XPRT_TRANSPORT_UDP
:
1021 case XPRT_TRANSPORT_TCP
:
1022 case XPRT_TRANSPORT_RDMA
:
1025 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1030 * For text based NFSv2/v3 mounts, the mount protocol transport default
1031 * settings should depend upon the specified NFS transport.
1033 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
1035 nfs_validate_transport_protocol(mnt
);
1037 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
1038 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
1040 switch (mnt
->nfs_server
.protocol
) {
1041 case XPRT_TRANSPORT_UDP
:
1042 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1044 case XPRT_TRANSPORT_TCP
:
1045 case XPRT_TRANSPORT_RDMA
:
1046 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1051 * Parse the value of the 'sec=' option.
1053 static int nfs_parse_security_flavors(char *value
,
1054 struct nfs_parsed_mount_data
*mnt
)
1056 substring_t args
[MAX_OPT_ARGS
];
1058 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
1060 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
1062 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
1065 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1068 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
1071 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
1074 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
1077 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
1080 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
1083 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1086 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1089 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1092 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1098 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1099 mnt
->auth_flavor_len
= 1;
1103 static int nfs_parse_version_string(char *string
,
1104 struct nfs_parsed_mount_data
*mnt
,
1107 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1108 switch (match_token(string
, nfs_vers_tokens
, args
)) {
1113 mnt
->flags
|= NFS_MOUNT_VER3
;
1117 /* Backward compatibility option. In future,
1118 * the mount program should always supply
1119 * a NFSv4 minor version number.
1125 mnt
->minorversion
= 0;
1129 mnt
->minorversion
= 1;
1137 static int nfs_get_option_str(substring_t args
[], char **option
)
1140 *option
= match_strdup(args
);
1144 static int nfs_get_option_ul(substring_t args
[], unsigned long *option
)
1149 string
= match_strdup(args
);
1152 rc
= strict_strtoul(string
, 10, option
);
1159 * Error-check and convert a string of mount options from user space into
1160 * a data structure. The whole mount string is processed; bad options are
1161 * skipped as they are encountered. If there were no errors, return 1;
1162 * otherwise return 0 (zero).
1164 static int nfs_parse_mount_options(char *raw
,
1165 struct nfs_parsed_mount_data
*mnt
)
1167 char *p
, *string
, *secdata
;
1168 int rc
, sloppy
= 0, invalid_option
= 0;
1169 unsigned short protofamily
= AF_UNSPEC
;
1170 unsigned short mountfamily
= AF_UNSPEC
;
1173 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
1176 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
1178 secdata
= alloc_secdata();
1182 rc
= security_sb_copy_data(raw
, secdata
);
1184 goto out_security_failure
;
1186 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
1188 goto out_security_failure
;
1190 free_secdata(secdata
);
1192 while ((p
= strsep(&raw
, ",")) != NULL
) {
1193 substring_t args
[MAX_OPT_ARGS
];
1194 unsigned long option
;
1200 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
1202 token
= match_token(p
, nfs_mount_option_tokens
, args
);
1206 * boolean options: foo/nofoo
1209 mnt
->flags
|= NFS_MOUNT_SOFT
;
1212 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1215 mnt
->flags
|= NFS_MOUNT_POSIX
;
1218 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1221 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1224 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1227 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1230 mnt
->flags
|= NFS_MOUNT_NOAC
;
1233 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1234 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1235 NFS_MOUNT_LOCAL_FCNTL
);
1238 mnt
->flags
|= NFS_MOUNT_NONLM
;
1239 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1240 NFS_MOUNT_LOCAL_FCNTL
);
1243 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1244 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1247 mnt
->flags
|= NFS_MOUNT_TCP
;
1248 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1251 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1252 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1253 xprt_load_transport(p
);
1256 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1259 mnt
->flags
|= NFS_MOUNT_NOACL
;
1262 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1264 case Opt_nordirplus
:
1265 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1267 case Opt_sharecache
:
1268 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1270 case Opt_nosharecache
:
1271 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1274 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1276 case Opt_noresvport
:
1277 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1280 mnt
->options
|= NFS_OPTION_FSCACHE
;
1281 kfree(mnt
->fscache_uniq
);
1282 mnt
->fscache_uniq
= NULL
;
1285 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1286 kfree(mnt
->fscache_uniq
);
1287 mnt
->fscache_uniq
= NULL
;
1291 * options that take numeric values
1294 if (nfs_get_option_ul(args
, &option
) ||
1296 goto out_invalid_value
;
1297 mnt
->nfs_server
.port
= option
;
1300 if (nfs_get_option_ul(args
, &option
))
1301 goto out_invalid_value
;
1302 mnt
->rsize
= option
;
1305 if (nfs_get_option_ul(args
, &option
))
1306 goto out_invalid_value
;
1307 mnt
->wsize
= option
;
1310 if (nfs_get_option_ul(args
, &option
))
1311 goto out_invalid_value
;
1312 mnt
->bsize
= option
;
1315 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1316 goto out_invalid_value
;
1317 mnt
->timeo
= option
;
1320 if (nfs_get_option_ul(args
, &option
) || option
== 0)
1321 goto out_invalid_value
;
1322 mnt
->retrans
= option
;
1325 if (nfs_get_option_ul(args
, &option
))
1326 goto out_invalid_value
;
1327 mnt
->acregmin
= option
;
1330 if (nfs_get_option_ul(args
, &option
))
1331 goto out_invalid_value
;
1332 mnt
->acregmax
= option
;
1335 if (nfs_get_option_ul(args
, &option
))
1336 goto out_invalid_value
;
1337 mnt
->acdirmin
= option
;
1340 if (nfs_get_option_ul(args
, &option
))
1341 goto out_invalid_value
;
1342 mnt
->acdirmax
= option
;
1345 if (nfs_get_option_ul(args
, &option
))
1346 goto out_invalid_value
;
1347 mnt
->acregmin
= mnt
->acregmax
=
1348 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1351 if (nfs_get_option_ul(args
, &option
))
1352 goto out_invalid_value
;
1353 mnt
->namlen
= option
;
1356 if (nfs_get_option_ul(args
, &option
) ||
1358 goto out_invalid_value
;
1359 mnt
->mount_server
.port
= option
;
1362 if (nfs_get_option_ul(args
, &option
) ||
1363 option
< NFS_MNT_VERSION
||
1364 option
> NFS_MNT3_VERSION
)
1365 goto out_invalid_value
;
1366 mnt
->mount_server
.version
= option
;
1368 case Opt_minorversion
:
1369 if (nfs_get_option_ul(args
, &option
))
1370 goto out_invalid_value
;
1371 if (option
> NFS4_MAX_MINOR_VERSION
)
1372 goto out_invalid_value
;
1373 mnt
->minorversion
= option
;
1377 * options that take text values
1380 string
= match_strdup(args
);
1383 rc
= nfs_parse_version_string(string
, mnt
, args
);
1386 goto out_invalid_value
;
1389 string
= match_strdup(args
);
1392 rc
= nfs_parse_security_flavors(string
, mnt
);
1395 dfprintk(MOUNT
, "NFS: unrecognized "
1396 "security flavor\n");
1401 string
= match_strdup(args
);
1404 token
= match_token(string
,
1405 nfs_xprt_protocol_tokens
, args
);
1407 protofamily
= AF_INET
;
1410 protofamily
= AF_INET6
;
1412 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1413 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1416 protofamily
= AF_INET6
;
1418 mnt
->flags
|= NFS_MOUNT_TCP
;
1419 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1422 /* vector side protocols to TCP */
1423 mnt
->flags
|= NFS_MOUNT_TCP
;
1424 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1425 xprt_load_transport(string
);
1428 dfprintk(MOUNT
, "NFS: unrecognized "
1429 "transport protocol\n");
1435 case Opt_mountproto
:
1436 string
= match_strdup(args
);
1439 token
= match_token(string
,
1440 nfs_xprt_protocol_tokens
, args
);
1443 mountfamily
= AF_INET
;
1446 mountfamily
= AF_INET6
;
1448 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1451 mountfamily
= AF_INET6
;
1453 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1455 case Opt_xprt_rdma
: /* not used for side protocols */
1457 dfprintk(MOUNT
, "NFS: unrecognized "
1458 "transport protocol\n");
1463 string
= match_strdup(args
);
1466 mnt
->nfs_server
.addrlen
=
1467 rpc_pton(mnt
->net
, string
, strlen(string
),
1469 &mnt
->nfs_server
.address
,
1470 sizeof(mnt
->nfs_server
.address
));
1472 if (mnt
->nfs_server
.addrlen
== 0)
1473 goto out_invalid_address
;
1475 case Opt_clientaddr
:
1476 if (nfs_get_option_str(args
, &mnt
->client_address
))
1480 if (nfs_get_option_str(args
,
1481 &mnt
->mount_server
.hostname
))
1485 string
= match_strdup(args
);
1488 mnt
->mount_server
.addrlen
=
1489 rpc_pton(mnt
->net
, string
, strlen(string
),
1491 &mnt
->mount_server
.address
,
1492 sizeof(mnt
->mount_server
.address
));
1494 if (mnt
->mount_server
.addrlen
== 0)
1495 goto out_invalid_address
;
1497 case Opt_lookupcache
:
1498 string
= match_strdup(args
);
1501 token
= match_token(string
,
1502 nfs_lookupcache_tokens
, args
);
1505 case Opt_lookupcache_all
:
1506 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1508 case Opt_lookupcache_positive
:
1509 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1510 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1512 case Opt_lookupcache_none
:
1513 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1516 dfprintk(MOUNT
, "NFS: invalid "
1517 "lookupcache argument\n");
1521 case Opt_fscache_uniq
:
1522 if (nfs_get_option_str(args
, &mnt
->fscache_uniq
))
1524 mnt
->options
|= NFS_OPTION_FSCACHE
;
1526 case Opt_local_lock
:
1527 string
= match_strdup(args
);
1530 token
= match_token(string
, nfs_local_lock_tokens
,
1534 case Opt_local_lock_all
:
1535 mnt
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1536 NFS_MOUNT_LOCAL_FCNTL
);
1538 case Opt_local_lock_flock
:
1539 mnt
->flags
|= NFS_MOUNT_LOCAL_FLOCK
;
1541 case Opt_local_lock_posix
:
1542 mnt
->flags
|= NFS_MOUNT_LOCAL_FCNTL
;
1544 case Opt_local_lock_none
:
1545 mnt
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1546 NFS_MOUNT_LOCAL_FCNTL
);
1549 dfprintk(MOUNT
, "NFS: invalid "
1550 "local_lock argument\n");
1560 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1563 case Opt_deprecated
:
1564 dfprintk(MOUNT
, "NFS: ignoring mount option "
1570 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1575 if (!sloppy
&& invalid_option
)
1578 if (mnt
->minorversion
&& mnt
->version
!= 4)
1579 goto out_minorversion_mismatch
;
1582 * verify that any proto=/mountproto= options match the address
1583 * familiies in the addr=/mountaddr= options.
1585 if (protofamily
!= AF_UNSPEC
&&
1586 protofamily
!= mnt
->nfs_server
.address
.ss_family
)
1587 goto out_proto_mismatch
;
1589 if (mountfamily
!= AF_UNSPEC
) {
1590 if (mnt
->mount_server
.addrlen
) {
1591 if (mountfamily
!= mnt
->mount_server
.address
.ss_family
)
1592 goto out_mountproto_mismatch
;
1594 if (mountfamily
!= mnt
->nfs_server
.address
.ss_family
)
1595 goto out_mountproto_mismatch
;
1601 out_mountproto_mismatch
:
1602 printk(KERN_INFO
"NFS: mount server address does not match mountproto= "
1606 printk(KERN_INFO
"NFS: server address does not match proto= option\n");
1608 out_invalid_address
:
1609 printk(KERN_INFO
"NFS: bad IP address specified: %s\n", p
);
1612 printk(KERN_INFO
"NFS: bad mount option value specified: %s\n", p
);
1614 out_minorversion_mismatch
:
1615 printk(KERN_INFO
"NFS: mount option vers=%u does not support "
1616 "minorversion=%u\n", mnt
->version
, mnt
->minorversion
);
1619 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1621 out_security_failure
:
1622 free_secdata(secdata
);
1623 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1628 * Match the requested auth flavors with the list returned by
1629 * the server. Returns zero and sets the mount's authentication
1630 * flavor on success; returns -EACCES if server does not support
1631 * the requested flavor.
1633 static int nfs_walk_authlist(struct nfs_parsed_mount_data
*args
,
1634 struct nfs_mount_request
*request
)
1636 unsigned int i
, j
, server_authlist_len
= *(request
->auth_flav_len
);
1639 * Certain releases of Linux's mountd return an empty
1640 * flavor list. To prevent behavioral regression with
1641 * these servers (ie. rejecting mounts that used to
1642 * succeed), revert to pre-2.6.32 behavior (no checking)
1643 * if the returned flavor list is empty.
1645 if (server_authlist_len
== 0)
1649 * We avoid sophisticated negotiating here, as there are
1650 * plenty of cases where we can get it wrong, providing
1651 * either too little or too much security.
1653 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1654 * flavor listed first. However, some servers list
1655 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1656 * preferred default, in args->auth_flavors[0] if user
1657 * didn't specify sec= mount option.
1659 for (i
= 0; i
< args
->auth_flavor_len
; i
++)
1660 for (j
= 0; j
< server_authlist_len
; j
++)
1661 if (args
->auth_flavors
[i
] == request
->auth_flavs
[j
]) {
1662 dfprintk(MOUNT
, "NFS: using auth flavor %d\n",
1663 request
->auth_flavs
[j
]);
1664 args
->auth_flavors
[0] = request
->auth_flavs
[j
];
1668 dfprintk(MOUNT
, "NFS: server does not support requested auth flavor\n");
1669 nfs_umount(request
);
1674 * Use the remote server's MOUNT service to request the NFS file handle
1675 * corresponding to the provided path.
1677 static int nfs_try_mount(struct nfs_parsed_mount_data
*args
,
1678 struct nfs_fh
*root_fh
)
1680 rpc_authflavor_t server_authlist
[NFS_MAX_SECFLAVORS
];
1681 unsigned int server_authlist_len
= ARRAY_SIZE(server_authlist
);
1682 struct nfs_mount_request request
= {
1683 .sap
= (struct sockaddr
*)
1684 &args
->mount_server
.address
,
1685 .dirpath
= args
->nfs_server
.export_path
,
1686 .protocol
= args
->mount_server
.protocol
,
1688 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1689 .auth_flav_len
= &server_authlist_len
,
1690 .auth_flavs
= server_authlist
,
1695 if (args
->mount_server
.version
== 0) {
1696 switch (args
->version
) {
1698 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1701 args
->mount_server
.version
= NFS_MNT_VERSION
;
1704 request
.version
= args
->mount_server
.version
;
1706 if (args
->mount_server
.hostname
)
1707 request
.hostname
= args
->mount_server
.hostname
;
1709 request
.hostname
= args
->nfs_server
.hostname
;
1712 * Construct the mount server's address.
1714 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1715 memcpy(request
.sap
, &args
->nfs_server
.address
,
1716 args
->nfs_server
.addrlen
);
1717 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1719 request
.salen
= args
->mount_server
.addrlen
;
1720 nfs_set_port(request
.sap
, &args
->mount_server
.port
, 0);
1723 * Now ask the mount server to map our export path
1726 status
= nfs_mount(&request
);
1728 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1729 request
.hostname
, status
);
1734 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1736 if (args
->mount_server
.version
!= NFS_MNT3_VERSION
)
1738 return nfs_walk_authlist(args
, &request
);
1742 * Split "dev_name" into "hostname:export_path".
1744 * The leftmost colon demarks the split between the server's hostname
1745 * and the export path. If the hostname starts with a left square
1746 * bracket, then it may contain colons.
1748 * Note: caller frees hostname and export path, even on error.
1750 static int nfs_parse_devname(const char *dev_name
,
1751 char **hostname
, size_t maxnamlen
,
1752 char **export_path
, size_t maxpathlen
)
1757 /* Is the host name protected with square brakcets? */
1758 if (*dev_name
== '[') {
1759 end
= strchr(++dev_name
, ']');
1760 if (end
== NULL
|| end
[1] != ':')
1761 goto out_bad_devname
;
1763 len
= end
- dev_name
;
1768 end
= strchr(dev_name
, ':');
1770 goto out_bad_devname
;
1771 len
= end
- dev_name
;
1773 /* kill possible hostname list: not supported */
1774 comma
= strchr(dev_name
, ',');
1775 if (comma
!= NULL
&& comma
< end
)
1779 if (len
> maxnamlen
)
1782 /* N.B. caller will free nfs_server.hostname in all cases */
1783 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1784 if (*hostname
== NULL
)
1786 len
= strlen(++end
);
1787 if (len
> maxpathlen
)
1789 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1793 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1797 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1801 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1805 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1806 return -ENAMETOOLONG
;
1809 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1810 return -ENAMETOOLONG
;
1814 * Validate the NFS2/NFS3 mount data
1815 * - fills in the mount root filehandle
1817 * For option strings, user space handles the following behaviors:
1819 * + DNS: mapping server host name to IP address ("addr=" option)
1821 * + failure mode: how to behave if a mount request can't be handled
1822 * immediately ("fg/bg" option)
1824 * + retry: how often to retry a mount request ("retry=" option)
1826 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1827 * mountproto=tcp after mountproto=udp, and so on
1829 static int nfs_validate_mount_data(void *options
,
1830 struct nfs_parsed_mount_data
*args
,
1831 struct nfs_fh
*mntfh
,
1832 const char *dev_name
)
1834 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1835 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
1840 switch (data
->version
) {
1846 if (data
->flags
& NFS_MOUNT_VER3
)
1848 data
->root
.size
= NFS2_FHSIZE
;
1849 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1851 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1854 memset(data
->context
, 0, sizeof(data
->context
));
1856 if (data
->flags
& NFS_MOUNT_VER3
) {
1857 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1858 goto out_invalid_fh
;
1859 mntfh
->size
= data
->root
.size
;
1862 mntfh
->size
= NFS2_FHSIZE
;
1867 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1868 if (mntfh
->size
< sizeof(mntfh
->data
))
1869 memset(mntfh
->data
+ mntfh
->size
, 0,
1870 sizeof(mntfh
->data
) - mntfh
->size
);
1873 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1876 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1877 args
->flags
|= NFS_MOUNT_LEGACY_INTERFACE
;
1878 args
->rsize
= data
->rsize
;
1879 args
->wsize
= data
->wsize
;
1880 args
->timeo
= data
->timeo
;
1881 args
->retrans
= data
->retrans
;
1882 args
->acregmin
= data
->acregmin
;
1883 args
->acregmax
= data
->acregmax
;
1884 args
->acdirmin
= data
->acdirmin
;
1885 args
->acdirmax
= data
->acdirmax
;
1887 memcpy(sap
, &data
->addr
, sizeof(data
->addr
));
1888 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1889 if (!nfs_verify_server_address(sap
))
1890 goto out_no_address
;
1892 if (!(data
->flags
& NFS_MOUNT_TCP
))
1893 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1894 /* N.B. caller will free nfs_server.hostname in all cases */
1895 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1896 args
->namlen
= data
->namlen
;
1897 args
->bsize
= data
->bsize
;
1899 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1900 args
->auth_flavors
[0] = data
->pseudoflavor
;
1901 if (!args
->nfs_server
.hostname
)
1904 if (!(data
->flags
& NFS_MOUNT_NONLM
))
1905 args
->flags
&= ~(NFS_MOUNT_LOCAL_FLOCK
|
1906 NFS_MOUNT_LOCAL_FCNTL
);
1908 args
->flags
|= (NFS_MOUNT_LOCAL_FLOCK
|
1909 NFS_MOUNT_LOCAL_FCNTL
);
1911 * The legacy version 6 binary mount data from userspace has a
1912 * field used only to transport selinux information into the
1913 * the kernel. To continue to support that functionality we
1914 * have a touch of selinux knowledge here in the NFS code. The
1915 * userspace code converted context=blah to just blah so we are
1916 * converting back to the full string selinux understands.
1918 if (data
->context
[0]){
1919 #ifdef CONFIG_SECURITY_SELINUX
1921 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1924 strcpy(opts_str
, "context=");
1925 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1926 strcat(opts_str
, &data
->context
[0]);
1927 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1940 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1943 if (!nfs_verify_server_address(sap
))
1944 goto out_no_address
;
1946 if (args
->version
== 4)
1947 #ifdef CONFIG_NFS_V4
1948 return nfs4_validate_text_mount_data(options
,
1951 goto out_v4_not_compiled
;
1954 nfs_set_port(sap
, &args
->nfs_server
.port
, 0);
1956 nfs_set_mount_transport_protocol(args
);
1958 status
= nfs_parse_devname(dev_name
,
1959 &args
->nfs_server
.hostname
,
1961 &args
->nfs_server
.export_path
,
1964 status
= nfs_try_mount(args
, mntfh
);
1966 kfree(args
->nfs_server
.export_path
);
1967 args
->nfs_server
.export_path
= NULL
;
1976 #ifndef CONFIG_NFS_V3
1977 if (args
->version
== 3)
1978 goto out_v3_not_compiled
;
1979 #endif /* !CONFIG_NFS_V3 */
1984 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1988 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1993 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1996 #ifndef CONFIG_NFS_V3
1997 out_v3_not_compiled
:
1998 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1999 return -EPROTONOSUPPORT
;
2000 #endif /* !CONFIG_NFS_V3 */
2002 #ifndef CONFIG_NFS_V4
2003 out_v4_not_compiled
:
2004 dfprintk(MOUNT
, "NFS: NFSv4 is not compiled into kernel\n");
2005 return -EPROTONOSUPPORT
;
2006 #endif /* !CONFIG_NFS_V4 */
2009 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
2013 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
2017 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
2022 nfs_compare_remount_data(struct nfs_server
*nfss
,
2023 struct nfs_parsed_mount_data
*data
)
2025 if (data
->flags
!= nfss
->flags
||
2026 data
->rsize
!= nfss
->rsize
||
2027 data
->wsize
!= nfss
->wsize
||
2028 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
2029 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
2030 data
->acregmin
!= nfss
->acregmin
/ HZ
||
2031 data
->acregmax
!= nfss
->acregmax
/ HZ
||
2032 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
2033 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
2034 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
2035 data
->nfs_server
.port
!= nfss
->port
||
2036 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
2037 !rpc_cmp_addr((struct sockaddr
*)&data
->nfs_server
.address
,
2038 (struct sockaddr
*)&nfss
->nfs_client
->cl_addr
))
2045 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
2048 struct nfs_server
*nfss
= sb
->s_fs_info
;
2049 struct nfs_parsed_mount_data
*data
;
2050 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
2051 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
2052 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
2055 * Userspace mount programs that send binary options generally send
2056 * them populated with default values. We have no way to know which
2057 * ones were explicitly specified. Fall back to legacy behavior and
2058 * just return success.
2060 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
2061 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
2062 options
->version
<= 6))))
2065 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2069 /* fill out struct with values from existing mount */
2070 data
->flags
= nfss
->flags
;
2071 data
->rsize
= nfss
->rsize
;
2072 data
->wsize
= nfss
->wsize
;
2073 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
2074 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
2075 data
->acregmin
= nfss
->acregmin
/ HZ
;
2076 data
->acregmax
= nfss
->acregmax
/ HZ
;
2077 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
2078 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
2079 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
2080 data
->nfs_server
.port
= nfss
->port
;
2081 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
2082 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
2083 data
->nfs_server
.addrlen
);
2085 /* overwrite those values with any that were specified */
2086 error
= nfs_parse_mount_options((char *)options
, data
);
2091 * noac is a special case. It implies -o sync, but that's not
2092 * necessarily reflected in the mtab options. do_remount_sb
2093 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2094 * remount options, so we have to explicitly reset it.
2096 if (data
->flags
& NFS_MOUNT_NOAC
)
2097 *flags
|= MS_SYNCHRONOUS
;
2099 /* compare new mount options with old ones */
2100 error
= nfs_compare_remount_data(nfss
, data
);
2107 * Initialise the common bits of the superblock
2109 static inline void nfs_initialise_sb(struct super_block
*sb
)
2111 struct nfs_server
*server
= NFS_SB(sb
);
2113 sb
->s_magic
= NFS_SUPER_MAGIC
;
2115 /* We probably want something more informative here */
2116 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
2117 "%u:%u", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
2119 if (sb
->s_blocksize
== 0)
2120 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
2121 &sb
->s_blocksize_bits
);
2123 sb
->s_bdi
= &server
->backing_dev_info
;
2125 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
2129 * Finish setting up an NFS2/3 superblock
2131 static void nfs_fill_super(struct super_block
*sb
,
2132 struct nfs_parsed_mount_data
*data
)
2134 struct nfs_server
*server
= NFS_SB(sb
);
2136 sb
->s_blocksize_bits
= 0;
2137 sb
->s_blocksize
= 0;
2139 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
2141 if (server
->nfs_client
->rpc_ops
->version
== 3) {
2142 /* The VFS shouldn't apply the umask to mode bits. We will do
2143 * so ourselves when necessary.
2145 sb
->s_flags
|= MS_POSIXACL
;
2146 sb
->s_time_gran
= 1;
2149 sb
->s_op
= &nfs_sops
;
2150 nfs_initialise_sb(sb
);
2154 * Finish setting up a cloned NFS2/3 superblock
2156 static void nfs_clone_super(struct super_block
*sb
,
2157 const struct super_block
*old_sb
)
2159 struct nfs_server
*server
= NFS_SB(sb
);
2161 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2162 sb
->s_blocksize
= old_sb
->s_blocksize
;
2163 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2165 if (server
->nfs_client
->rpc_ops
->version
== 3) {
2166 /* The VFS shouldn't apply the umask to mode bits. We will do
2167 * so ourselves when necessary.
2169 sb
->s_flags
|= MS_POSIXACL
;
2170 sb
->s_time_gran
= 1;
2173 sb
->s_op
= old_sb
->s_op
;
2174 nfs_initialise_sb(sb
);
2177 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
2179 const struct nfs_server
*a
= s
->s_fs_info
;
2180 const struct rpc_clnt
*clnt_a
= a
->client
;
2181 const struct rpc_clnt
*clnt_b
= b
->client
;
2183 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
2185 if (a
->nfs_client
!= b
->nfs_client
)
2187 if (a
->flags
!= b
->flags
)
2189 if (a
->wsize
!= b
->wsize
)
2191 if (a
->rsize
!= b
->rsize
)
2193 if (a
->acregmin
!= b
->acregmin
)
2195 if (a
->acregmax
!= b
->acregmax
)
2197 if (a
->acdirmin
!= b
->acdirmin
)
2199 if (a
->acdirmax
!= b
->acdirmax
)
2201 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
2208 struct nfs_sb_mountdata
{
2209 struct nfs_server
*server
;
2213 static int nfs_set_super(struct super_block
*s
, void *data
)
2215 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2216 struct nfs_server
*server
= sb_mntdata
->server
;
2219 s
->s_flags
= sb_mntdata
->mntflags
;
2220 s
->s_fs_info
= server
;
2221 s
->s_d_op
= server
->nfs_client
->rpc_ops
->dentry_ops
;
2222 ret
= set_anon_super(s
, server
);
2224 server
->s_dev
= s
->s_dev
;
2228 static int nfs_compare_super_address(struct nfs_server
*server1
,
2229 struct nfs_server
*server2
)
2231 struct sockaddr
*sap1
, *sap2
;
2233 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
2234 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
2236 if (sap1
->sa_family
!= sap2
->sa_family
)
2239 switch (sap1
->sa_family
) {
2241 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
2242 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
2243 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
2245 if (sin1
->sin_port
!= sin2
->sin_port
)
2250 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
2251 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
2252 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
2254 if (sin1
->sin6_port
!= sin2
->sin6_port
)
2265 static int nfs_compare_super(struct super_block
*sb
, void *data
)
2267 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2268 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2269 int mntflags
= sb_mntdata
->mntflags
;
2271 if (!nfs_compare_super_address(old
, server
))
2273 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2274 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2276 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2278 return nfs_compare_mount_options(sb
, server
, mntflags
);
2281 static int nfs_bdi_register(struct nfs_server
*server
)
2283 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2286 static struct dentry
*nfs_fs_mount(struct file_system_type
*fs_type
,
2287 int flags
, const char *dev_name
, void *raw_data
)
2289 struct nfs_server
*server
= NULL
;
2290 struct super_block
*s
;
2291 struct nfs_parsed_mount_data
*data
;
2292 struct nfs_fh
*mntfh
;
2293 struct dentry
*mntroot
= ERR_PTR(-ENOMEM
);
2294 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2295 struct nfs_sb_mountdata sb_mntdata
= {
2300 data
= nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION
);
2301 mntfh
= nfs_alloc_fhandle();
2302 if (data
== NULL
|| mntfh
== NULL
)
2305 /* Validate the mount data */
2306 error
= nfs_validate_mount_data(raw_data
, data
, mntfh
, dev_name
);
2308 mntroot
= ERR_PTR(error
);
2312 #ifdef CONFIG_NFS_V4
2313 if (data
->version
== 4) {
2314 mntroot
= nfs4_try_mount(flags
, dev_name
, data
);
2317 #endif /* CONFIG_NFS_V4 */
2319 /* Get a volume representation */
2320 server
= nfs_create_server(data
, mntfh
);
2321 if (IS_ERR(server
)) {
2322 mntroot
= ERR_CAST(server
);
2325 sb_mntdata
.server
= server
;
2327 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2328 compare_super
= NULL
;
2330 /* -o noac implies -o sync */
2331 if (server
->flags
& NFS_MOUNT_NOAC
)
2332 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2334 /* Get a superblock - note that we may end up sharing one that already exists */
2335 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2337 mntroot
= ERR_CAST(s
);
2341 if (s
->s_fs_info
!= server
) {
2342 nfs_free_server(server
);
2345 error
= nfs_bdi_register(server
);
2347 mntroot
= ERR_PTR(error
);
2348 goto error_splat_bdi
;
2353 /* initial superblock/root creation */
2354 nfs_fill_super(s
, data
);
2355 nfs_fscache_get_super_cookie(s
, data
->fscache_uniq
, NULL
);
2358 mntroot
= nfs_get_root(s
, mntfh
, dev_name
);
2359 if (IS_ERR(mntroot
))
2360 goto error_splat_super
;
2362 error
= security_sb_set_mnt_opts(s
, &data
->lsm_opts
);
2364 goto error_splat_root
;
2366 s
->s_flags
|= MS_ACTIVE
;
2369 nfs_free_parsed_mount_data(data
);
2370 nfs_free_fhandle(mntfh
);
2374 nfs_free_server(server
);
2379 mntroot
= ERR_PTR(error
);
2381 if (server
&& !s
->s_root
)
2382 bdi_unregister(&server
->backing_dev_info
);
2384 deactivate_locked_super(s
);
2389 * Ensure that we unregister the bdi before kill_anon_super
2390 * releases the device name
2392 static void nfs_put_super(struct super_block
*s
)
2394 struct nfs_server
*server
= NFS_SB(s
);
2396 bdi_unregister(&server
->backing_dev_info
);
2400 * Destroy an NFS2/3 superblock
2402 static void nfs_kill_super(struct super_block
*s
)
2404 struct nfs_server
*server
= NFS_SB(s
);
2407 nfs_fscache_release_super_cookie(s
);
2408 nfs_free_server(server
);
2412 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2414 static struct dentry
*
2415 nfs_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2416 const char *dev_name
, void *raw_data
)
2418 struct nfs_clone_mount
*data
= raw_data
;
2419 struct super_block
*s
;
2420 struct nfs_server
*server
;
2421 struct dentry
*mntroot
;
2422 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2423 struct nfs_sb_mountdata sb_mntdata
= {
2428 dprintk("--> nfs_xdev_mount()\n");
2430 /* create a new volume representation */
2431 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2432 if (IS_ERR(server
)) {
2433 error
= PTR_ERR(server
);
2434 goto out_err_noserver
;
2436 sb_mntdata
.server
= server
;
2438 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2439 compare_super
= NULL
;
2441 /* -o noac implies -o sync */
2442 if (server
->flags
& NFS_MOUNT_NOAC
)
2443 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2445 /* Get a superblock - note that we may end up sharing one that already exists */
2446 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2452 if (s
->s_fs_info
!= server
) {
2453 nfs_free_server(server
);
2456 error
= nfs_bdi_register(server
);
2458 goto error_splat_bdi
;
2462 /* initial superblock/root creation */
2463 nfs_clone_super(s
, data
->sb
);
2464 nfs_fscache_get_super_cookie(s
, NULL
, data
);
2467 mntroot
= nfs_get_root(s
, data
->fh
, dev_name
);
2468 if (IS_ERR(mntroot
)) {
2469 error
= PTR_ERR(mntroot
);
2470 goto error_splat_super
;
2472 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2475 goto error_splat_super
;
2478 s
->s_flags
|= MS_ACTIVE
;
2480 /* clone any lsm security options from the parent to the new sb */
2481 security_sb_clone_mnt_opts(data
->sb
, s
);
2483 dprintk("<-- nfs_xdev_mount() = 0\n");
2487 nfs_free_server(server
);
2489 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error
);
2490 return ERR_PTR(error
);
2493 if (server
&& !s
->s_root
)
2494 bdi_unregister(&server
->backing_dev_info
);
2496 deactivate_locked_super(s
);
2497 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error
);
2498 return ERR_PTR(error
);
2501 #ifdef CONFIG_NFS_V4
2504 * Finish setting up a cloned NFS4 superblock
2506 static void nfs4_clone_super(struct super_block
*sb
,
2507 const struct super_block
*old_sb
)
2509 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2510 sb
->s_blocksize
= old_sb
->s_blocksize
;
2511 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2512 sb
->s_time_gran
= 1;
2513 sb
->s_op
= old_sb
->s_op
;
2515 * The VFS shouldn't apply the umask to mode bits. We will do
2516 * so ourselves when necessary.
2518 sb
->s_flags
|= MS_POSIXACL
;
2519 sb
->s_xattr
= old_sb
->s_xattr
;
2520 nfs_initialise_sb(sb
);
2524 * Set up an NFS4 superblock
2526 static void nfs4_fill_super(struct super_block
*sb
)
2528 sb
->s_time_gran
= 1;
2529 sb
->s_op
= &nfs4_sops
;
2531 * The VFS shouldn't apply the umask to mode bits. We will do
2532 * so ourselves when necessary.
2534 sb
->s_flags
|= MS_POSIXACL
;
2535 sb
->s_xattr
= nfs4_xattr_handlers
;
2536 nfs_initialise_sb(sb
);
2539 static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data
*args
)
2541 args
->flags
&= ~(NFS_MOUNT_NONLM
|NFS_MOUNT_NOACL
|NFS_MOUNT_VER3
|
2542 NFS_MOUNT_LOCAL_FLOCK
|NFS_MOUNT_LOCAL_FCNTL
);
2545 static int nfs4_validate_text_mount_data(void *options
,
2546 struct nfs_parsed_mount_data
*args
,
2547 const char *dev_name
)
2549 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2551 nfs_set_port(sap
, &args
->nfs_server
.port
, NFS_PORT
);
2553 nfs_validate_transport_protocol(args
);
2555 nfs4_validate_mount_flags(args
);
2557 if (args
->version
!= 4) {
2559 "NFS4: Illegal mount version\n");
2563 if (args
->auth_flavor_len
> 1) {
2565 "NFS4: Too many RPC auth flavours specified\n");
2569 return nfs_parse_devname(dev_name
,
2570 &args
->nfs_server
.hostname
,
2572 &args
->nfs_server
.export_path
,
2577 * Validate NFSv4 mount options
2579 static int nfs4_validate_mount_data(void *options
,
2580 struct nfs_parsed_mount_data
*args
,
2581 const char *dev_name
)
2583 struct sockaddr
*sap
= (struct sockaddr
*)&args
->nfs_server
.address
;
2584 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2590 switch (data
->version
) {
2592 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2593 goto out_no_address
;
2594 if (data
->host_addrlen
== 0)
2595 goto out_no_address
;
2596 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2597 if (copy_from_user(sap
, data
->host_addr
, data
->host_addrlen
))
2599 if (!nfs_verify_server_address(sap
))
2600 goto out_no_address
;
2602 if (data
->auth_flavourlen
) {
2603 if (data
->auth_flavourlen
> 1)
2604 goto out_inval_auth
;
2605 if (copy_from_user(&args
->auth_flavors
[0],
2606 data
->auth_flavours
,
2607 sizeof(args
->auth_flavors
[0])))
2611 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2614 args
->nfs_server
.hostname
= c
;
2616 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2619 args
->nfs_server
.export_path
= c
;
2620 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2622 c
= strndup_user(data
->client_addr
.data
, 16);
2625 args
->client_address
= c
;
2628 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2632 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2633 args
->rsize
= data
->rsize
;
2634 args
->wsize
= data
->wsize
;
2635 args
->timeo
= data
->timeo
;
2636 args
->retrans
= data
->retrans
;
2637 args
->acregmin
= data
->acregmin
;
2638 args
->acregmax
= data
->acregmax
;
2639 args
->acdirmin
= data
->acdirmin
;
2640 args
->acdirmax
= data
->acdirmax
;
2641 args
->nfs_server
.protocol
= data
->proto
;
2642 nfs_validate_transport_protocol(args
);
2646 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2649 if (!nfs_verify_server_address(sap
))
2652 return nfs4_validate_text_mount_data(options
, args
, dev_name
);
2658 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2662 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2663 data
->auth_flavourlen
);
2667 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2672 * Get the superblock for the NFS4 root partition
2674 static struct dentry
*
2675 nfs4_remote_mount(struct file_system_type
*fs_type
, int flags
,
2676 const char *dev_name
, void *raw_data
)
2678 struct nfs_parsed_mount_data
*data
= raw_data
;
2679 struct super_block
*s
;
2680 struct nfs_server
*server
;
2681 struct nfs_fh
*mntfh
;
2682 struct dentry
*mntroot
;
2683 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2684 struct nfs_sb_mountdata sb_mntdata
= {
2687 int error
= -ENOMEM
;
2689 mntfh
= nfs_alloc_fhandle();
2690 if (data
== NULL
|| mntfh
== NULL
)
2693 /* Get a volume representation */
2694 server
= nfs4_create_server(data
, mntfh
);
2695 if (IS_ERR(server
)) {
2696 error
= PTR_ERR(server
);
2699 sb_mntdata
.server
= server
;
2701 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2702 compare_super
= NULL
;
2704 /* -o noac implies -o sync */
2705 if (server
->flags
& NFS_MOUNT_NOAC
)
2706 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2708 /* Get a superblock - note that we may end up sharing one that already exists */
2709 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2715 if (s
->s_fs_info
!= server
) {
2716 nfs_free_server(server
);
2719 error
= nfs_bdi_register(server
);
2721 goto error_splat_bdi
;
2725 /* initial superblock/root creation */
2727 nfs_fscache_get_super_cookie(s
, data
->fscache_uniq
, NULL
);
2730 mntroot
= nfs4_get_root(s
, mntfh
, dev_name
);
2731 if (IS_ERR(mntroot
)) {
2732 error
= PTR_ERR(mntroot
);
2733 goto error_splat_super
;
2736 error
= security_sb_set_mnt_opts(s
, &data
->lsm_opts
);
2738 goto error_splat_root
;
2740 s
->s_flags
|= MS_ACTIVE
;
2742 nfs_free_fhandle(mntfh
);
2746 nfs_free_fhandle(mntfh
);
2747 return ERR_PTR(error
);
2750 nfs_free_server(server
);
2756 if (server
&& !s
->s_root
)
2757 bdi_unregister(&server
->backing_dev_info
);
2759 deactivate_locked_super(s
);
2763 static struct vfsmount
*nfs_do_root_mount(struct file_system_type
*fs_type
,
2764 int flags
, void *data
, const char *hostname
)
2766 struct vfsmount
*root_mnt
;
2770 len
= strlen(hostname
) + 5;
2771 root_devname
= kmalloc(len
, GFP_KERNEL
);
2772 if (root_devname
== NULL
)
2773 return ERR_PTR(-ENOMEM
);
2774 /* Does hostname needs to be enclosed in brackets? */
2775 if (strchr(hostname
, ':'))
2776 snprintf(root_devname
, len
, "[%s]:/", hostname
);
2778 snprintf(root_devname
, len
, "%s:/", hostname
);
2779 root_mnt
= vfs_kern_mount(fs_type
, flags
, root_devname
, data
);
2780 kfree(root_devname
);
2784 struct nfs_referral_count
{
2785 struct list_head list
;
2786 const struct task_struct
*task
;
2787 unsigned int referral_count
;
2790 static LIST_HEAD(nfs_referral_count_list
);
2791 static DEFINE_SPINLOCK(nfs_referral_count_list_lock
);
2793 static struct nfs_referral_count
*nfs_find_referral_count(void)
2795 struct nfs_referral_count
*p
;
2797 list_for_each_entry(p
, &nfs_referral_count_list
, list
) {
2798 if (p
->task
== current
)
2804 #define NFS_MAX_NESTED_REFERRALS 2
2806 static int nfs_referral_loop_protect(void)
2808 struct nfs_referral_count
*p
, *new;
2811 new = kmalloc(sizeof(*new), GFP_KERNEL
);
2814 new->task
= current
;
2815 new->referral_count
= 1;
2818 spin_lock(&nfs_referral_count_list_lock
);
2819 p
= nfs_find_referral_count();
2821 if (p
->referral_count
>= NFS_MAX_NESTED_REFERRALS
)
2824 p
->referral_count
++;
2826 list_add(&new->list
, &nfs_referral_count_list
);
2829 spin_unlock(&nfs_referral_count_list_lock
);
2835 static void nfs_referral_loop_unprotect(void)
2837 struct nfs_referral_count
*p
;
2839 spin_lock(&nfs_referral_count_list_lock
);
2840 p
= nfs_find_referral_count();
2841 p
->referral_count
--;
2842 if (p
->referral_count
== 0)
2846 spin_unlock(&nfs_referral_count_list_lock
);
2850 static struct dentry
*nfs_follow_remote_path(struct vfsmount
*root_mnt
,
2851 const char *export_path
)
2853 struct dentry
*dentry
;
2856 if (IS_ERR(root_mnt
))
2857 return ERR_CAST(root_mnt
);
2859 err
= nfs_referral_loop_protect();
2862 return ERR_PTR(err
);
2865 dentry
= mount_subtree(root_mnt
, export_path
);
2866 nfs_referral_loop_unprotect();
2871 static struct dentry
*nfs4_try_mount(int flags
, const char *dev_name
,
2872 struct nfs_parsed_mount_data
*data
)
2875 struct vfsmount
*root_mnt
;
2878 dfprintk(MOUNT
, "--> nfs4_try_mount()\n");
2880 export_path
= data
->nfs_server
.export_path
;
2881 data
->nfs_server
.export_path
= "/";
2882 root_mnt
= nfs_do_root_mount(&nfs4_remote_fs_type
, flags
, data
,
2883 data
->nfs_server
.hostname
);
2884 data
->nfs_server
.export_path
= export_path
;
2886 res
= nfs_follow_remote_path(root_mnt
, export_path
);
2888 dfprintk(MOUNT
, "<-- nfs4_try_mount() = %ld%s\n",
2889 IS_ERR(res
) ? PTR_ERR(res
) : 0,
2890 IS_ERR(res
) ? " [error]" : "");
2895 * Get the superblock for an NFS4 mountpoint
2897 static struct dentry
*nfs4_mount(struct file_system_type
*fs_type
,
2898 int flags
, const char *dev_name
, void *raw_data
)
2900 struct nfs_parsed_mount_data
*data
;
2901 int error
= -ENOMEM
;
2902 struct dentry
*res
= ERR_PTR(-ENOMEM
);
2904 data
= nfs_alloc_parsed_mount_data(4);
2908 /* Validate the mount data */
2909 error
= nfs4_validate_mount_data(raw_data
, data
, dev_name
);
2911 res
= ERR_PTR(error
);
2915 res
= nfs4_try_mount(flags
, dev_name
, data
);
2917 error
= PTR_ERR(res
);
2920 nfs_free_parsed_mount_data(data
);
2921 dprintk("<-- nfs4_mount() = %d%s\n", error
,
2922 error
!= 0 ? " [error]" : "");
2926 static void nfs4_kill_super(struct super_block
*sb
)
2928 struct nfs_server
*server
= NFS_SB(sb
);
2930 dprintk("--> %s\n", __func__
);
2931 nfs_super_return_all_delegations(sb
);
2932 kill_anon_super(sb
);
2933 nfs_fscache_release_super_cookie(sb
);
2934 nfs_free_server(server
);
2935 dprintk("<-- %s\n", __func__
);
2939 * Clone an NFS4 server record on xdev traversal (FSID-change)
2941 static struct dentry
*
2942 nfs4_xdev_mount(struct file_system_type
*fs_type
, int flags
,
2943 const char *dev_name
, void *raw_data
)
2945 struct nfs_clone_mount
*data
= raw_data
;
2946 struct super_block
*s
;
2947 struct nfs_server
*server
;
2948 struct dentry
*mntroot
;
2949 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2950 struct nfs_sb_mountdata sb_mntdata
= {
2955 dprintk("--> nfs4_xdev_mount()\n");
2957 /* create a new volume representation */
2958 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
, data
->authflavor
);
2959 if (IS_ERR(server
)) {
2960 error
= PTR_ERR(server
);
2961 goto out_err_noserver
;
2963 sb_mntdata
.server
= server
;
2965 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2966 compare_super
= NULL
;
2968 /* -o noac implies -o sync */
2969 if (server
->flags
& NFS_MOUNT_NOAC
)
2970 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
2972 /* Get a superblock - note that we may end up sharing one that already exists */
2973 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2979 if (s
->s_fs_info
!= server
) {
2980 nfs_free_server(server
);
2983 error
= nfs_bdi_register(server
);
2985 goto error_splat_bdi
;
2989 /* initial superblock/root creation */
2990 nfs4_clone_super(s
, data
->sb
);
2991 nfs_fscache_get_super_cookie(s
, NULL
, data
);
2994 mntroot
= nfs4_get_root(s
, data
->fh
, dev_name
);
2995 if (IS_ERR(mntroot
)) {
2996 error
= PTR_ERR(mntroot
);
2997 goto error_splat_super
;
2999 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
3002 goto error_splat_super
;
3005 s
->s_flags
|= MS_ACTIVE
;
3007 security_sb_clone_mnt_opts(data
->sb
, s
);
3009 dprintk("<-- nfs4_xdev_mount() = 0\n");
3013 nfs_free_server(server
);
3015 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error
);
3016 return ERR_PTR(error
);
3019 if (server
&& !s
->s_root
)
3020 bdi_unregister(&server
->backing_dev_info
);
3022 deactivate_locked_super(s
);
3023 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error
);
3024 return ERR_PTR(error
);
3027 static struct dentry
*
3028 nfs4_remote_referral_mount(struct file_system_type
*fs_type
, int flags
,
3029 const char *dev_name
, void *raw_data
)
3031 struct nfs_clone_mount
*data
= raw_data
;
3032 struct super_block
*s
;
3033 struct nfs_server
*server
;
3034 struct dentry
*mntroot
;
3035 struct nfs_fh
*mntfh
;
3036 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
3037 struct nfs_sb_mountdata sb_mntdata
= {
3040 int error
= -ENOMEM
;
3042 dprintk("--> nfs4_referral_get_sb()\n");
3044 mntfh
= nfs_alloc_fhandle();
3048 /* create a new volume representation */
3049 server
= nfs4_create_referral_server(data
, mntfh
);
3050 if (IS_ERR(server
)) {
3051 error
= PTR_ERR(server
);
3052 goto out_err_noserver
;
3054 sb_mntdata
.server
= server
;
3056 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
3057 compare_super
= NULL
;
3059 /* -o noac implies -o sync */
3060 if (server
->flags
& NFS_MOUNT_NOAC
)
3061 sb_mntdata
.mntflags
|= MS_SYNCHRONOUS
;
3063 /* Get a superblock - note that we may end up sharing one that already exists */
3064 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
3070 if (s
->s_fs_info
!= server
) {
3071 nfs_free_server(server
);
3074 error
= nfs_bdi_register(server
);
3076 goto error_splat_bdi
;
3080 /* initial superblock/root creation */
3082 nfs_fscache_get_super_cookie(s
, NULL
, data
);
3085 mntroot
= nfs4_get_root(s
, mntfh
, dev_name
);
3086 if (IS_ERR(mntroot
)) {
3087 error
= PTR_ERR(mntroot
);
3088 goto error_splat_super
;
3090 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
3093 goto error_splat_super
;
3096 s
->s_flags
|= MS_ACTIVE
;
3098 security_sb_clone_mnt_opts(data
->sb
, s
);
3100 nfs_free_fhandle(mntfh
);
3101 dprintk("<-- nfs4_referral_get_sb() = 0\n");
3105 nfs_free_server(server
);
3107 nfs_free_fhandle(mntfh
);
3109 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
3110 return ERR_PTR(error
);
3113 if (server
&& !s
->s_root
)
3114 bdi_unregister(&server
->backing_dev_info
);
3116 deactivate_locked_super(s
);
3117 nfs_free_fhandle(mntfh
);
3118 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
3119 return ERR_PTR(error
);
3123 * Create an NFS4 server record on referral traversal
3125 static struct dentry
*nfs4_referral_mount(struct file_system_type
*fs_type
,
3126 int flags
, const char *dev_name
, void *raw_data
)
3128 struct nfs_clone_mount
*data
= raw_data
;
3130 struct vfsmount
*root_mnt
;
3133 dprintk("--> nfs4_referral_mount()\n");
3135 export_path
= data
->mnt_path
;
3136 data
->mnt_path
= "/";
3138 root_mnt
= nfs_do_root_mount(&nfs4_remote_referral_fs_type
,
3139 flags
, data
, data
->hostname
);
3140 data
->mnt_path
= export_path
;
3142 res
= nfs_follow_remote_path(root_mnt
, export_path
);
3143 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3144 IS_ERR(res
) ? PTR_ERR(res
) : 0,
3145 IS_ERR(res
) ? " [error]" : "");
3149 #endif /* CONFIG_NFS_V4 */