4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, 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/nfs_fs.h>
37 #include <linux/nfs_mount.h>
38 #include <linux/nfs4_mount.h>
39 #include <linux/lockd/bind.h>
40 #include <linux/smp_lock.h>
41 #include <linux/seq_file.h>
42 #include <linux/mount.h>
43 #include <linux/nfs_idmap.h>
44 #include <linux/vfs.h>
45 #include <linux/inet.h>
46 #include <linux/nfs_xdr.h>
47 #include <linux/magic.h>
48 #include <linux/parser.h>
50 #include <asm/system.h>
51 #include <asm/uaccess.h>
55 #include "delegation.h"
59 #define NFSDBG_FACILITY NFSDBG_VFS
62 /* Mount options that take no arguments */
65 Opt_posix
, Opt_noposix
,
72 Opt_rdirplus
, Opt_nordirplus
,
73 Opt_sharecache
, Opt_nosharecache
,
75 /* Mount options that take integer arguments */
77 Opt_rsize
, Opt_wsize
, Opt_bsize
,
78 Opt_timeo
, Opt_retrans
,
79 Opt_acregmin
, Opt_acregmax
,
80 Opt_acdirmin
, Opt_acdirmax
,
84 Opt_mountprog
, Opt_mountvers
,
85 Opt_nfsprog
, Opt_nfsvers
,
87 /* Mount options that take string arguments */
88 Opt_sec
, Opt_proto
, Opt_mountproto
,
89 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
91 /* Mount options that are ignored */
92 Opt_userspace
, Opt_deprecated
,
97 static match_table_t nfs_mount_option_tokens
= {
98 { Opt_userspace
, "bg" },
99 { Opt_userspace
, "fg" },
100 { Opt_soft
, "soft" },
101 { Opt_hard
, "hard" },
102 { Opt_intr
, "intr" },
103 { Opt_nointr
, "nointr" },
104 { Opt_posix
, "posix" },
105 { Opt_noposix
, "noposix" },
107 { Opt_nocto
, "nocto" },
109 { Opt_noac
, "noac" },
110 { Opt_lock
, "lock" },
111 { Opt_nolock
, "nolock" },
117 { Opt_noacl
, "noacl" },
118 { Opt_rdirplus
, "rdirplus" },
119 { Opt_nordirplus
, "nordirplus" },
120 { Opt_sharecache
, "sharecache" },
121 { Opt_nosharecache
, "nosharecache" },
123 { Opt_port
, "port=%u" },
124 { Opt_rsize
, "rsize=%u" },
125 { Opt_wsize
, "wsize=%u" },
126 { Opt_bsize
, "bsize=%u" },
127 { Opt_timeo
, "timeo=%u" },
128 { Opt_retrans
, "retrans=%u" },
129 { Opt_acregmin
, "acregmin=%u" },
130 { Opt_acregmax
, "acregmax=%u" },
131 { Opt_acdirmin
, "acdirmin=%u" },
132 { Opt_acdirmax
, "acdirmax=%u" },
133 { Opt_actimeo
, "actimeo=%u" },
134 { Opt_userspace
, "retry=%u" },
135 { Opt_namelen
, "namlen=%u" },
136 { Opt_mountport
, "mountport=%u" },
137 { Opt_mountprog
, "mountprog=%u" },
138 { Opt_mountvers
, "mountvers=%u" },
139 { Opt_nfsprog
, "nfsprog=%u" },
140 { Opt_nfsvers
, "nfsvers=%u" },
141 { Opt_nfsvers
, "vers=%u" },
143 { Opt_sec
, "sec=%s" },
144 { Opt_proto
, "proto=%s" },
145 { Opt_mountproto
, "mountproto=%s" },
146 { Opt_addr
, "addr=%s" },
147 { Opt_clientaddr
, "clientaddr=%s" },
148 { Opt_userspace
, "mounthost=%s" },
149 { Opt_mountaddr
, "mountaddr=%s" },
155 Opt_xprt_udp
, Opt_xprt_tcp
,
160 static match_table_t nfs_xprt_protocol_tokens
= {
161 { Opt_xprt_udp
, "udp" },
162 { Opt_xprt_tcp
, "tcp" },
164 { Opt_xprt_err
, NULL
}
168 Opt_sec_none
, Opt_sec_sys
,
169 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
170 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
171 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
176 static match_table_t nfs_secflavor_tokens
= {
177 { Opt_sec_none
, "none" },
178 { Opt_sec_none
, "null" },
179 { Opt_sec_sys
, "sys" },
181 { Opt_sec_krb5
, "krb5" },
182 { Opt_sec_krb5i
, "krb5i" },
183 { Opt_sec_krb5p
, "krb5p" },
185 { Opt_sec_lkey
, "lkey" },
186 { Opt_sec_lkeyi
, "lkeyi" },
187 { Opt_sec_lkeyp
, "lkeyp" },
189 { Opt_sec_err
, NULL
}
193 static void nfs_umount_begin(struct vfsmount
*, int);
194 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
195 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
196 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
197 static int nfs_get_sb(struct file_system_type
*, int, const char *, void *, struct vfsmount
*);
198 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
,
199 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
200 static void nfs_kill_super(struct super_block
*);
202 static struct file_system_type nfs_fs_type
= {
203 .owner
= THIS_MODULE
,
205 .get_sb
= nfs_get_sb
,
206 .kill_sb
= nfs_kill_super
,
207 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
210 struct file_system_type nfs_xdev_fs_type
= {
211 .owner
= THIS_MODULE
,
213 .get_sb
= nfs_xdev_get_sb
,
214 .kill_sb
= nfs_kill_super
,
215 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
218 static const struct super_operations nfs_sops
= {
219 .alloc_inode
= nfs_alloc_inode
,
220 .destroy_inode
= nfs_destroy_inode
,
221 .write_inode
= nfs_write_inode
,
222 .statfs
= nfs_statfs
,
223 .clear_inode
= nfs_clear_inode
,
224 .umount_begin
= nfs_umount_begin
,
225 .show_options
= nfs_show_options
,
226 .show_stats
= nfs_show_stats
,
230 static int nfs4_get_sb(struct file_system_type
*fs_type
,
231 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
232 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
,
233 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
234 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
,
235 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
236 static void nfs4_kill_super(struct super_block
*sb
);
238 static struct file_system_type nfs4_fs_type
= {
239 .owner
= THIS_MODULE
,
241 .get_sb
= nfs4_get_sb
,
242 .kill_sb
= nfs4_kill_super
,
243 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
246 struct file_system_type nfs4_xdev_fs_type
= {
247 .owner
= THIS_MODULE
,
249 .get_sb
= nfs4_xdev_get_sb
,
250 .kill_sb
= nfs4_kill_super
,
251 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
254 struct file_system_type nfs4_referral_fs_type
= {
255 .owner
= THIS_MODULE
,
257 .get_sb
= nfs4_referral_get_sb
,
258 .kill_sb
= nfs4_kill_super
,
259 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
262 static const struct super_operations nfs4_sops
= {
263 .alloc_inode
= nfs_alloc_inode
,
264 .destroy_inode
= nfs_destroy_inode
,
265 .write_inode
= nfs_write_inode
,
266 .statfs
= nfs_statfs
,
267 .clear_inode
= nfs4_clear_inode
,
268 .umount_begin
= nfs_umount_begin
,
269 .show_options
= nfs_show_options
,
270 .show_stats
= nfs_show_stats
,
274 static struct shrinker acl_shrinker
= {
275 .shrink
= nfs_access_cache_shrinker
,
276 .seeks
= DEFAULT_SEEKS
,
280 * Register the NFS filesystems
282 int __init
register_nfs_fs(void)
286 ret
= register_filesystem(&nfs_fs_type
);
290 ret
= nfs_register_sysctl();
294 ret
= register_filesystem(&nfs4_fs_type
);
298 register_shrinker(&acl_shrinker
);
303 nfs_unregister_sysctl();
306 unregister_filesystem(&nfs_fs_type
);
312 * Unregister the NFS filesystems
314 void __exit
unregister_nfs_fs(void)
316 unregister_shrinker(&acl_shrinker
);
318 unregister_filesystem(&nfs4_fs_type
);
320 nfs_unregister_sysctl();
321 unregister_filesystem(&nfs_fs_type
);
325 * Deliver file system statistics to userspace
327 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
329 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
330 unsigned char blockbits
;
331 unsigned long blockres
;
332 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
333 struct nfs_fattr fattr
;
334 struct nfs_fsstat res
= {
341 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
344 buf
->f_type
= NFS_SUPER_MAGIC
;
347 * Current versions of glibc do not correctly handle the
348 * case where f_frsize != f_bsize. Eventually we want to
349 * report the value of wtmult in this field.
351 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
354 * On most *nix systems, f_blocks, f_bfree, and f_bavail
355 * are reported in units of f_frsize. Linux hasn't had
356 * an f_frsize field in its statfs struct until recently,
357 * thus historically Linux's sys_statfs reports these
358 * fields in units of f_bsize.
360 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
361 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
362 blockres
= (1 << blockbits
) - 1;
363 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
364 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
365 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
367 buf
->f_files
= res
.tfiles
;
368 buf
->f_ffree
= res
.afiles
;
370 buf
->f_namelen
= server
->namelen
;
376 dprintk("%s: statfs error = %d\n", __FUNCTION__
, -error
);
382 * Map the security flavour number to a name
384 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
386 static const struct {
387 rpc_authflavor_t flavour
;
390 { RPC_AUTH_NULL
, "null" },
391 { RPC_AUTH_UNIX
, "sys" },
392 { RPC_AUTH_GSS_KRB5
, "krb5" },
393 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
394 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
395 { RPC_AUTH_GSS_LKEY
, "lkey" },
396 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
397 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
398 { RPC_AUTH_GSS_SPKM
, "spkm" },
399 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
400 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
401 { UINT_MAX
, "unknown" }
405 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
406 if (sec_flavours
[i
].flavour
== flavour
)
409 return sec_flavours
[i
].str
;
413 * Describe the mount options in force on this server representation
415 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
, int showdefaults
)
417 static const struct proc_nfs_info
{
422 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
423 { NFS_MOUNT_INTR
, ",intr", "" },
424 { NFS_MOUNT_NOCTO
, ",nocto", "" },
425 { NFS_MOUNT_NOAC
, ",noac", "" },
426 { NFS_MOUNT_NONLM
, ",nolock", "" },
427 { NFS_MOUNT_NOACL
, ",noacl", "" },
428 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
429 { NFS_MOUNT_UNSHARED
, ",nosharecache", ""},
432 const struct proc_nfs_info
*nfs_infop
;
433 struct nfs_client
*clp
= nfss
->nfs_client
;
437 seq_printf(m
, ",vers=%d", clp
->rpc_ops
->version
);
438 seq_printf(m
, ",rsize=%d", nfss
->rsize
);
439 seq_printf(m
, ",wsize=%d", nfss
->wsize
);
440 if (nfss
->acregmin
!= 3*HZ
|| showdefaults
)
441 seq_printf(m
, ",acregmin=%d", nfss
->acregmin
/HZ
);
442 if (nfss
->acregmax
!= 60*HZ
|| showdefaults
)
443 seq_printf(m
, ",acregmax=%d", nfss
->acregmax
/HZ
);
444 if (nfss
->acdirmin
!= 30*HZ
|| showdefaults
)
445 seq_printf(m
, ",acdirmin=%d", nfss
->acdirmin
/HZ
);
446 if (nfss
->acdirmax
!= 60*HZ
|| showdefaults
)
447 seq_printf(m
, ",acdirmax=%d", nfss
->acdirmax
/HZ
);
448 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
449 if (nfss
->flags
& nfs_infop
->flag
)
450 seq_puts(m
, nfs_infop
->str
);
452 seq_puts(m
, nfs_infop
->nostr
);
454 switch (nfss
->client
->cl_xprt
->prot
) {
462 snprintf(buf
, sizeof(buf
), "%u", nfss
->client
->cl_xprt
->prot
);
465 seq_printf(m
, ",proto=%s", proto
);
466 seq_printf(m
, ",timeo=%lu", 10U * clp
->retrans_timeo
/ HZ
);
467 seq_printf(m
, ",retrans=%u", clp
->retrans_count
);
468 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
472 * Describe the mount options on this VFS mountpoint
474 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
476 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
478 nfs_show_mount_options(m
, nfss
, 0);
480 seq_printf(m
, ",addr="NIPQUAD_FMT
,
481 NIPQUAD(nfss
->nfs_client
->cl_addr
.sin_addr
));
487 * Present statistical information for this VFS mountpoint
489 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
492 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
493 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
494 struct nfs_iostats totals
= { };
496 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
499 * Display all mount option settings
501 seq_printf(m
, "\n\topts:\t");
502 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
503 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
504 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
505 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
506 nfs_show_mount_options(m
, nfss
, 1);
508 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
510 seq_printf(m
, "\n\tcaps:\t");
511 seq_printf(m
, "caps=0x%x", nfss
->caps
);
512 seq_printf(m
, ",wtmult=%d", nfss
->wtmult
);
513 seq_printf(m
, ",dtsize=%d", nfss
->dtsize
);
514 seq_printf(m
, ",bsize=%d", nfss
->bsize
);
515 seq_printf(m
, ",namelen=%d", nfss
->namelen
);
518 if (nfss
->nfs_client
->cl_nfsversion
== 4) {
519 seq_printf(m
, "\n\tnfsv4:\t");
520 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
521 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
522 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
527 * Display security flavor in effect for this mount
529 seq_printf(m
, "\n\tsec:\tflavor=%d", auth
->au_ops
->au_flavor
);
531 seq_printf(m
, ",pseudoflavor=%d", auth
->au_flavor
);
534 * Display superblock I/O counters
536 for_each_possible_cpu(cpu
) {
537 struct nfs_iostats
*stats
;
540 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
542 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
543 totals
.events
[i
] += stats
->events
[i
];
544 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
545 totals
.bytes
[i
] += stats
->bytes
[i
];
550 seq_printf(m
, "\n\tevents:\t");
551 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
552 seq_printf(m
, "%lu ", totals
.events
[i
]);
553 seq_printf(m
, "\n\tbytes:\t");
554 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
555 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
558 rpc_print_iostats(m
, nfss
->client
);
564 * Begin unmount by attempting to remove all automounted mountpoints we added
565 * in response to xdev traversals and referrals
567 static void nfs_umount_begin(struct vfsmount
*vfsmnt
, int flags
)
569 struct nfs_server
*server
= NFS_SB(vfsmnt
->mnt_sb
);
570 struct rpc_clnt
*rpc
;
572 shrink_submounts(vfsmnt
, &nfs_automount_list
);
574 if (!(flags
& MNT_FORCE
))
576 /* -EIO all pending I/O */
577 rpc
= server
->client_acl
;
579 rpc_killall_tasks(rpc
);
580 rpc
= server
->client
;
582 rpc_killall_tasks(rpc
);
586 * Sanity-check a server address provided by the mount command
588 static int nfs_verify_server_address(struct sockaddr
*addr
)
590 switch (addr
->sa_family
) {
592 struct sockaddr_in
*sa
= (struct sockaddr_in
*) addr
;
593 if (sa
->sin_addr
.s_addr
!= INADDR_ANY
)
603 * Error-check and convert a string of mount options from user space into
606 static int nfs_parse_mount_options(char *raw
,
607 struct nfs_parsed_mount_data
*mnt
)
612 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
615 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
617 while ((p
= strsep(&raw
, ",")) != NULL
) {
618 substring_t args
[MAX_OPT_ARGS
];
624 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
626 token
= match_token(p
, nfs_mount_option_tokens
, args
);
629 mnt
->flags
|= NFS_MOUNT_SOFT
;
632 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
635 mnt
->flags
|= NFS_MOUNT_INTR
;
638 mnt
->flags
&= ~NFS_MOUNT_INTR
;
641 mnt
->flags
|= NFS_MOUNT_POSIX
;
644 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
647 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
650 mnt
->flags
|= NFS_MOUNT_NOCTO
;
653 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
656 mnt
->flags
|= NFS_MOUNT_NOAC
;
659 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
662 mnt
->flags
|= NFS_MOUNT_NONLM
;
665 mnt
->flags
&= ~NFS_MOUNT_VER3
;
668 mnt
->flags
|= NFS_MOUNT_VER3
;
671 mnt
->flags
&= ~NFS_MOUNT_TCP
;
672 mnt
->nfs_server
.protocol
= IPPROTO_UDP
;
677 mnt
->flags
|= NFS_MOUNT_TCP
;
678 mnt
->nfs_server
.protocol
= IPPROTO_TCP
;
683 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
686 mnt
->flags
|= NFS_MOUNT_NOACL
;
689 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
692 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
695 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
697 case Opt_nosharecache
:
698 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
702 if (match_int(args
, &option
))
704 if (option
< 0 || option
> 65535)
706 mnt
->nfs_server
.address
.sin_port
= htons(option
);
709 if (match_int(args
, &mnt
->rsize
))
713 if (match_int(args
, &mnt
->wsize
))
717 if (match_int(args
, &option
))
724 if (match_int(args
, &mnt
->timeo
))
728 if (match_int(args
, &mnt
->retrans
))
732 if (match_int(args
, &mnt
->acregmin
))
736 if (match_int(args
, &mnt
->acregmax
))
740 if (match_int(args
, &mnt
->acdirmin
))
744 if (match_int(args
, &mnt
->acdirmax
))
748 if (match_int(args
, &option
))
755 mnt
->acdirmax
= option
;
758 if (match_int(args
, &mnt
->namlen
))
762 if (match_int(args
, &option
))
764 if (option
< 0 || option
> 65535)
766 mnt
->mount_server
.port
= option
;
769 if (match_int(args
, &option
))
773 mnt
->mount_server
.program
= option
;
776 if (match_int(args
, &option
))
780 mnt
->mount_server
.version
= option
;
783 if (match_int(args
, &option
))
787 mnt
->nfs_server
.program
= option
;
790 if (match_int(args
, &option
))
794 mnt
->flags
&= ~NFS_MOUNT_VER3
;
797 mnt
->flags
|= NFS_MOUNT_VER3
;
805 string
= match_strdup(args
);
808 token
= match_token(string
, nfs_secflavor_tokens
, args
);
812 * The flags setting is for v2/v3. The flavor_len
813 * setting is for v4. v2/v3 also need to know the
814 * difference between NULL and UNIX.
818 mnt
->flags
&= ~NFS_MOUNT_SECFLAVOUR
;
819 mnt
->auth_flavor_len
= 0;
820 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
823 mnt
->flags
&= ~NFS_MOUNT_SECFLAVOUR
;
824 mnt
->auth_flavor_len
= 0;
825 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
828 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
829 mnt
->auth_flavor_len
= 1;
830 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
833 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
834 mnt
->auth_flavor_len
= 1;
835 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
838 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
839 mnt
->auth_flavor_len
= 1;
840 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
843 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
844 mnt
->auth_flavor_len
= 1;
845 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
848 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
849 mnt
->auth_flavor_len
= 1;
850 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
853 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
854 mnt
->auth_flavor_len
= 1;
855 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
858 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
859 mnt
->auth_flavor_len
= 1;
860 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
863 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
864 mnt
->auth_flavor_len
= 1;
865 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
868 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
869 mnt
->auth_flavor_len
= 1;
870 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
877 string
= match_strdup(args
);
880 token
= match_token(string
,
881 nfs_xprt_protocol_tokens
, args
);
886 mnt
->flags
&= ~NFS_MOUNT_TCP
;
887 mnt
->nfs_server
.protocol
= IPPROTO_UDP
;
892 mnt
->flags
|= NFS_MOUNT_TCP
;
893 mnt
->nfs_server
.protocol
= IPPROTO_TCP
;
902 string
= match_strdup(args
);
905 token
= match_token(string
,
906 nfs_xprt_protocol_tokens
, args
);
911 mnt
->mount_server
.protocol
= IPPROTO_UDP
;
914 mnt
->mount_server
.protocol
= IPPROTO_TCP
;
921 string
= match_strdup(args
);
924 mnt
->nfs_server
.address
.sin_family
= AF_INET
;
925 mnt
->nfs_server
.address
.sin_addr
.s_addr
=
930 string
= match_strdup(args
);
933 mnt
->client_address
= string
;
936 string
= match_strdup(args
);
939 mnt
->mount_server
.address
.sin_family
= AF_INET
;
940 mnt
->mount_server
.address
.sin_addr
.s_addr
=
957 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
961 printk(KERN_INFO
"NFS: unrecognized NFS version number\n");
965 printk(KERN_INFO
"NFS: unrecognized transport protocol\n");
969 printk(KERN_INFO
"NFS: unrecognized security flavor\n");
973 printk(KERN_INFO
"NFS: unknown mount option: %s\n", p
);
978 * Use the remote server's MOUNT service to request the NFS file handle
979 * corresponding to the provided path.
981 static int nfs_try_mount(struct nfs_parsed_mount_data
*args
,
982 struct nfs_fh
*root_fh
)
984 struct sockaddr_in sin
;
987 if (args
->mount_server
.version
== 0) {
988 if (args
->flags
& NFS_MOUNT_VER3
)
989 args
->mount_server
.version
= NFS_MNT3_VERSION
;
991 args
->mount_server
.version
= NFS_MNT_VERSION
;
995 * Construct the mount server's address.
997 if (args
->mount_server
.address
.sin_addr
.s_addr
!= INADDR_ANY
)
998 sin
= args
->mount_server
.address
;
1000 sin
= args
->nfs_server
.address
;
1002 * autobind will be used if mount_server.port == 0
1004 sin
.sin_port
= htons(args
->mount_server
.port
);
1007 * Now ask the mount server to map our export path
1010 status
= nfs_mount((struct sockaddr
*) &sin
,
1012 args
->nfs_server
.hostname
,
1013 args
->nfs_server
.export_path
,
1014 args
->mount_server
.version
,
1015 args
->mount_server
.protocol
,
1020 dfprintk(MOUNT
, "NFS: unable to mount server " NIPQUAD_FMT
1021 ", error %d\n", NIPQUAD(sin
.sin_addr
.s_addr
), status
);
1026 * Validate the NFS2/NFS3 mount data
1027 * - fills in the mount root filehandle
1029 * For option strings, user space handles the following behaviors:
1031 * + DNS: mapping server host name to IP address ("addr=" option)
1033 * + failure mode: how to behave if a mount request can't be handled
1034 * immediately ("fg/bg" option)
1036 * + retry: how often to retry a mount request ("retry=" option)
1038 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1039 * mountproto=tcp after mountproto=udp, and so on
1041 * XXX: as far as I can tell, changing the NFS program number is not
1042 * supported in the NFS client.
1044 static int nfs_validate_mount_data(void *options
,
1045 struct nfs_parsed_mount_data
*args
,
1046 struct nfs_fh
*mntfh
,
1047 const char *dev_name
)
1049 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1054 memset(args
, 0, sizeof(*args
));
1055 args
->flags
= (NFS_MOUNT_VER3
| NFS_MOUNT_TCP
);
1056 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1057 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1061 args
->acregmax
= 60;
1062 args
->acdirmin
= 30;
1063 args
->acdirmax
= 60;
1064 args
->mount_server
.protocol
= IPPROTO_UDP
;
1065 args
->mount_server
.program
= NFS_MNT_PROGRAM
;
1066 args
->nfs_server
.protocol
= IPPROTO_TCP
;
1067 args
->nfs_server
.program
= NFS_PROGRAM
;
1069 switch (data
->version
) {
1075 if (data
->flags
& NFS_MOUNT_VER3
)
1077 data
->root
.size
= NFS2_FHSIZE
;
1078 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1080 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1083 memset(data
->context
, 0, sizeof(data
->context
));
1085 if (data
->flags
& NFS_MOUNT_VER3
)
1086 mntfh
->size
= data
->root
.size
;
1088 mntfh
->size
= NFS2_FHSIZE
;
1090 if (mntfh
->size
> sizeof(mntfh
->data
))
1091 goto out_invalid_fh
;
1093 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1094 if (mntfh
->size
< sizeof(mntfh
->data
))
1095 memset(mntfh
->data
+ mntfh
->size
, 0,
1096 sizeof(mntfh
->data
) - mntfh
->size
);
1098 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1101 args
->flags
= data
->flags
;
1102 args
->rsize
= data
->rsize
;
1103 args
->wsize
= data
->wsize
;
1104 args
->flags
= data
->flags
;
1105 args
->timeo
= data
->timeo
;
1106 args
->retrans
= data
->retrans
;
1107 args
->acregmin
= data
->acregmin
;
1108 args
->acregmax
= data
->acregmax
;
1109 args
->acdirmin
= data
->acdirmin
;
1110 args
->acdirmax
= data
->acdirmax
;
1111 args
->nfs_server
.address
= data
->addr
;
1112 if (!(data
->flags
& NFS_MOUNT_TCP
))
1113 args
->nfs_server
.protocol
= IPPROTO_UDP
;
1114 /* N.B. caller will free nfs_server.hostname in all cases */
1115 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1116 args
->namlen
= data
->namlen
;
1117 args
->bsize
= data
->bsize
;
1118 args
->auth_flavors
[0] = data
->pseudoflavor
;
1125 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1128 c
= strchr(dev_name
, ':');
1132 /* N.B. caller will free nfs_server.hostname in all cases */
1133 args
->nfs_server
.hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1136 if (strlen(c
) > NFS_MAXPATHLEN
)
1137 return -ENAMETOOLONG
;
1138 args
->nfs_server
.export_path
= c
;
1140 status
= nfs_try_mount(args
, mntfh
);
1148 if (!(args
->flags
& NFS_MOUNT_SECFLAVOUR
))
1149 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1151 #ifndef CONFIG_NFS_V3
1152 if (args
->flags
& NFS_MOUNT_VER3
)
1153 goto out_v3_not_compiled
;
1154 #endif /* !CONFIG_NFS_V3 */
1156 if (!nfs_verify_server_address((struct sockaddr
*)
1157 &args
->nfs_server
.address
))
1158 goto out_no_address
;
1163 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1167 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1172 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1175 #ifndef CONFIG_NFS_V3
1176 out_v3_not_compiled
:
1177 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1178 return -EPROTONOSUPPORT
;
1179 #endif /* !CONFIG_NFS_V3 */
1182 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1186 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1191 * Initialise the common bits of the superblock
1193 static inline void nfs_initialise_sb(struct super_block
*sb
)
1195 struct nfs_server
*server
= NFS_SB(sb
);
1197 sb
->s_magic
= NFS_SUPER_MAGIC
;
1199 /* We probably want something more informative here */
1200 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
1201 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
1203 if (sb
->s_blocksize
== 0)
1204 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
1205 &sb
->s_blocksize_bits
);
1207 if (server
->flags
& NFS_MOUNT_NOAC
)
1208 sb
->s_flags
|= MS_SYNCHRONOUS
;
1210 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
1214 * Finish setting up an NFS2/3 superblock
1216 static void nfs_fill_super(struct super_block
*sb
,
1217 struct nfs_parsed_mount_data
*data
)
1219 struct nfs_server
*server
= NFS_SB(sb
);
1221 sb
->s_blocksize_bits
= 0;
1222 sb
->s_blocksize
= 0;
1224 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
1226 if (server
->flags
& NFS_MOUNT_VER3
) {
1227 /* The VFS shouldn't apply the umask to mode bits. We will do
1228 * so ourselves when necessary.
1230 sb
->s_flags
|= MS_POSIXACL
;
1231 sb
->s_time_gran
= 1;
1234 sb
->s_op
= &nfs_sops
;
1235 nfs_initialise_sb(sb
);
1239 * Finish setting up a cloned NFS2/3 superblock
1241 static void nfs_clone_super(struct super_block
*sb
,
1242 const struct super_block
*old_sb
)
1244 struct nfs_server
*server
= NFS_SB(sb
);
1246 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1247 sb
->s_blocksize
= old_sb
->s_blocksize
;
1248 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1250 if (server
->flags
& NFS_MOUNT_VER3
) {
1251 /* The VFS shouldn't apply the umask to mode bits. We will do
1252 * so ourselves when necessary.
1254 sb
->s_flags
|= MS_POSIXACL
;
1255 sb
->s_time_gran
= 1;
1258 sb
->s_op
= old_sb
->s_op
;
1259 nfs_initialise_sb(sb
);
1262 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1264 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
1266 const struct nfs_server
*a
= s
->s_fs_info
;
1267 const struct rpc_clnt
*clnt_a
= a
->client
;
1268 const struct rpc_clnt
*clnt_b
= b
->client
;
1270 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
1272 if (a
->nfs_client
!= b
->nfs_client
)
1274 if (a
->flags
!= b
->flags
)
1276 if (a
->wsize
!= b
->wsize
)
1278 if (a
->rsize
!= b
->rsize
)
1280 if (a
->acregmin
!= b
->acregmin
)
1282 if (a
->acregmax
!= b
->acregmax
)
1284 if (a
->acdirmin
!= b
->acdirmin
)
1286 if (a
->acdirmax
!= b
->acdirmax
)
1288 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
1295 struct nfs_sb_mountdata
{
1296 struct nfs_server
*server
;
1300 static int nfs_set_super(struct super_block
*s
, void *data
)
1302 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1303 struct nfs_server
*server
= sb_mntdata
->server
;
1306 s
->s_flags
= sb_mntdata
->mntflags
;
1307 s
->s_fs_info
= server
;
1308 ret
= set_anon_super(s
, server
);
1310 server
->s_dev
= s
->s_dev
;
1314 static int nfs_compare_super(struct super_block
*sb
, void *data
)
1316 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1317 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
1318 int mntflags
= sb_mntdata
->mntflags
;
1320 if (memcmp(&old
->nfs_client
->cl_addr
,
1321 &server
->nfs_client
->cl_addr
,
1322 sizeof(old
->nfs_client
->cl_addr
)) != 0)
1324 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1325 if (old
->flags
& NFS_MOUNT_UNSHARED
)
1327 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
1329 return nfs_compare_mount_options(sb
, server
, mntflags
);
1332 static int nfs_get_sb(struct file_system_type
*fs_type
,
1333 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1335 struct nfs_server
*server
= NULL
;
1336 struct super_block
*s
;
1337 struct nfs_fh mntfh
;
1338 struct nfs_parsed_mount_data data
;
1339 struct dentry
*mntroot
;
1340 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1341 struct nfs_sb_mountdata sb_mntdata
= {
1346 /* Validate the mount data */
1347 error
= nfs_validate_mount_data(raw_data
, &data
, &mntfh
, dev_name
);
1351 /* Get a volume representation */
1352 server
= nfs_create_server(&data
, &mntfh
);
1353 if (IS_ERR(server
)) {
1354 error
= PTR_ERR(server
);
1357 sb_mntdata
.server
= server
;
1359 if (server
->flags
& NFS_MOUNT_UNSHARED
)
1360 compare_super
= NULL
;
1362 /* Get a superblock - note that we may end up sharing one that already exists */
1363 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1369 if (s
->s_fs_info
!= server
) {
1370 nfs_free_server(server
);
1375 /* initial superblock/root creation */
1376 nfs_fill_super(s
, &data
);
1379 mntroot
= nfs_get_root(s
, &mntfh
);
1380 if (IS_ERR(mntroot
)) {
1381 error
= PTR_ERR(mntroot
);
1382 goto error_splat_super
;
1385 s
->s_flags
|= MS_ACTIVE
;
1387 mnt
->mnt_root
= mntroot
;
1391 kfree(data
.nfs_server
.hostname
);
1395 nfs_free_server(server
);
1399 up_write(&s
->s_umount
);
1400 deactivate_super(s
);
1405 * Destroy an NFS2/3 superblock
1407 static void nfs_kill_super(struct super_block
*s
)
1409 struct nfs_server
*server
= NFS_SB(s
);
1412 nfs_free_server(server
);
1416 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1418 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
1419 const char *dev_name
, void *raw_data
,
1420 struct vfsmount
*mnt
)
1422 struct nfs_clone_mount
*data
= raw_data
;
1423 struct super_block
*s
;
1424 struct nfs_server
*server
;
1425 struct dentry
*mntroot
;
1426 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1427 struct nfs_sb_mountdata sb_mntdata
= {
1432 dprintk("--> nfs_xdev_get_sb()\n");
1434 /* create a new volume representation */
1435 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
1436 if (IS_ERR(server
)) {
1437 error
= PTR_ERR(server
);
1438 goto out_err_noserver
;
1440 sb_mntdata
.server
= server
;
1442 if (server
->flags
& NFS_MOUNT_UNSHARED
)
1443 compare_super
= NULL
;
1445 /* Get a superblock - note that we may end up sharing one that already exists */
1446 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1452 if (s
->s_fs_info
!= server
) {
1453 nfs_free_server(server
);
1458 /* initial superblock/root creation */
1459 nfs_clone_super(s
, data
->sb
);
1462 mntroot
= nfs_get_root(s
, data
->fh
);
1463 if (IS_ERR(mntroot
)) {
1464 error
= PTR_ERR(mntroot
);
1465 goto error_splat_super
;
1468 s
->s_flags
|= MS_ACTIVE
;
1470 mnt
->mnt_root
= mntroot
;
1472 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1476 nfs_free_server(server
);
1478 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error
);
1482 up_write(&s
->s_umount
);
1483 deactivate_super(s
);
1484 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error
);
1488 #ifdef CONFIG_NFS_V4
1491 * Finish setting up a cloned NFS4 superblock
1493 static void nfs4_clone_super(struct super_block
*sb
,
1494 const struct super_block
*old_sb
)
1496 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1497 sb
->s_blocksize
= old_sb
->s_blocksize
;
1498 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1499 sb
->s_time_gran
= 1;
1500 sb
->s_op
= old_sb
->s_op
;
1501 nfs_initialise_sb(sb
);
1505 * Set up an NFS4 superblock
1507 static void nfs4_fill_super(struct super_block
*sb
)
1509 sb
->s_time_gran
= 1;
1510 sb
->s_op
= &nfs4_sops
;
1511 nfs_initialise_sb(sb
);
1515 * Validate NFSv4 mount options
1517 static int nfs4_validate_mount_data(void *options
,
1518 struct nfs_parsed_mount_data
*args
,
1519 const char *dev_name
)
1521 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
1527 memset(args
, 0, sizeof(*args
));
1528 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1529 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1533 args
->acregmax
= 60;
1534 args
->acdirmin
= 30;
1535 args
->acdirmax
= 60;
1536 args
->nfs_server
.protocol
= IPPROTO_TCP
;
1538 switch (data
->version
) {
1540 if (data
->host_addrlen
!= sizeof(args
->nfs_server
.address
))
1541 goto out_no_address
;
1542 if (copy_from_user(&args
->nfs_server
.address
,
1544 sizeof(args
->nfs_server
.address
)))
1546 if (args
->nfs_server
.address
.sin_port
== 0)
1547 args
->nfs_server
.address
.sin_port
= htons(NFS_PORT
);
1548 if (!nfs_verify_server_address((struct sockaddr
*)
1549 &args
->nfs_server
.address
))
1550 goto out_no_address
;
1552 switch (data
->auth_flavourlen
) {
1554 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1557 if (copy_from_user(&args
->auth_flavors
[0],
1558 data
->auth_flavours
,
1559 sizeof(args
->auth_flavors
[0])))
1563 goto out_inval_auth
;
1566 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
1569 args
->nfs_server
.hostname
= c
;
1571 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
1574 args
->nfs_server
.export_path
= c
;
1575 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
1577 c
= strndup_user(data
->client_addr
.data
, 16);
1580 args
->client_address
= c
;
1583 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1587 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
1588 args
->rsize
= data
->rsize
;
1589 args
->wsize
= data
->wsize
;
1590 args
->timeo
= data
->timeo
;
1591 args
->retrans
= data
->retrans
;
1592 args
->acregmin
= data
->acregmin
;
1593 args
->acregmax
= data
->acregmax
;
1594 args
->acdirmin
= data
->acdirmin
;
1595 args
->acdirmax
= data
->acdirmax
;
1596 args
->nfs_server
.protocol
= data
->proto
;
1602 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1605 if (!nfs_verify_server_address((struct sockaddr
*)
1606 &args
->nfs_server
.address
))
1609 switch (args
->auth_flavor_len
) {
1611 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1616 goto out_inval_auth
;
1620 * Split "dev_name" into "hostname:mntpath".
1622 c
= strchr(dev_name
, ':');
1625 /* while calculating len, pretend ':' is '\0' */
1627 if (len
> NFS4_MAXNAMLEN
)
1628 return -ENAMETOOLONG
;
1629 args
->nfs_server
.hostname
= kzalloc(len
, GFP_KERNEL
);
1630 if (args
->nfs_server
.hostname
== NULL
)
1632 strncpy(args
->nfs_server
.hostname
, dev_name
, len
- 1);
1634 c
++; /* step over the ':' */
1636 if (len
> NFS4_MAXPATHLEN
)
1637 return -ENAMETOOLONG
;
1638 args
->nfs_server
.export_path
= kzalloc(len
+ 1, GFP_KERNEL
);
1639 if (args
->nfs_server
.export_path
== NULL
)
1641 strncpy(args
->nfs_server
.export_path
, c
, len
);
1643 dprintk("MNTPATH: %s\n", args
->nfs_server
.export_path
);
1645 if (args
->client_address
== NULL
)
1646 goto out_no_client_address
;
1655 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
1659 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
1660 data
->auth_flavourlen
);
1664 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
1667 out_no_client_address
:
1668 dfprintk(MOUNT
, "NFS4: mount program didn't pass callback address\n");
1673 * Get the superblock for an NFS4 mountpoint
1675 static int nfs4_get_sb(struct file_system_type
*fs_type
,
1676 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1678 struct nfs_parsed_mount_data data
;
1679 struct super_block
*s
;
1680 struct nfs_server
*server
;
1681 struct nfs_fh mntfh
;
1682 struct dentry
*mntroot
;
1683 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1684 struct nfs_sb_mountdata sb_mntdata
= {
1689 /* Validate the mount data */
1690 error
= nfs4_validate_mount_data(raw_data
, &data
, dev_name
);
1694 /* Get a volume representation */
1695 server
= nfs4_create_server(&data
, &mntfh
);
1696 if (IS_ERR(server
)) {
1697 error
= PTR_ERR(server
);
1700 sb_mntdata
.server
= server
;
1702 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
1703 compare_super
= NULL
;
1705 /* Get a superblock - note that we may end up sharing one that already exists */
1706 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1712 if (s
->s_fs_info
!= server
) {
1713 nfs_free_server(server
);
1718 /* initial superblock/root creation */
1722 mntroot
= nfs4_get_root(s
, &mntfh
);
1723 if (IS_ERR(mntroot
)) {
1724 error
= PTR_ERR(mntroot
);
1725 goto error_splat_super
;
1728 s
->s_flags
|= MS_ACTIVE
;
1730 mnt
->mnt_root
= mntroot
;
1734 kfree(data
.client_address
);
1735 kfree(data
.nfs_server
.export_path
);
1736 kfree(data
.nfs_server
.hostname
);
1740 nfs_free_server(server
);
1744 up_write(&s
->s_umount
);
1745 deactivate_super(s
);
1749 static void nfs4_kill_super(struct super_block
*sb
)
1751 struct nfs_server
*server
= NFS_SB(sb
);
1753 nfs_return_all_delegations(sb
);
1754 kill_anon_super(sb
);
1756 nfs4_renewd_prepare_shutdown(server
);
1757 nfs_free_server(server
);
1761 * Clone an NFS4 server record on xdev traversal (FSID-change)
1763 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
1764 const char *dev_name
, void *raw_data
,
1765 struct vfsmount
*mnt
)
1767 struct nfs_clone_mount
*data
= raw_data
;
1768 struct super_block
*s
;
1769 struct nfs_server
*server
;
1770 struct dentry
*mntroot
;
1771 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1772 struct nfs_sb_mountdata sb_mntdata
= {
1777 dprintk("--> nfs4_xdev_get_sb()\n");
1779 /* create a new volume representation */
1780 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
1781 if (IS_ERR(server
)) {
1782 error
= PTR_ERR(server
);
1783 goto out_err_noserver
;
1785 sb_mntdata
.server
= server
;
1787 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
1788 compare_super
= NULL
;
1790 /* Get a superblock - note that we may end up sharing one that already exists */
1791 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1797 if (s
->s_fs_info
!= server
) {
1798 nfs_free_server(server
);
1803 /* initial superblock/root creation */
1804 nfs4_clone_super(s
, data
->sb
);
1807 mntroot
= nfs4_get_root(s
, data
->fh
);
1808 if (IS_ERR(mntroot
)) {
1809 error
= PTR_ERR(mntroot
);
1810 goto error_splat_super
;
1813 s
->s_flags
|= MS_ACTIVE
;
1815 mnt
->mnt_root
= mntroot
;
1817 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1821 nfs_free_server(server
);
1823 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error
);
1827 up_write(&s
->s_umount
);
1828 deactivate_super(s
);
1829 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error
);
1834 * Create an NFS4 server record on referral traversal
1836 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
, int flags
,
1837 const char *dev_name
, void *raw_data
,
1838 struct vfsmount
*mnt
)
1840 struct nfs_clone_mount
*data
= raw_data
;
1841 struct super_block
*s
;
1842 struct nfs_server
*server
;
1843 struct dentry
*mntroot
;
1844 struct nfs_fh mntfh
;
1845 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1846 struct nfs_sb_mountdata sb_mntdata
= {
1851 dprintk("--> nfs4_referral_get_sb()\n");
1853 /* create a new volume representation */
1854 server
= nfs4_create_referral_server(data
, &mntfh
);
1855 if (IS_ERR(server
)) {
1856 error
= PTR_ERR(server
);
1857 goto out_err_noserver
;
1859 sb_mntdata
.server
= server
;
1861 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
1862 compare_super
= NULL
;
1864 /* Get a superblock - note that we may end up sharing one that already exists */
1865 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1871 if (s
->s_fs_info
!= server
) {
1872 nfs_free_server(server
);
1877 /* initial superblock/root creation */
1881 mntroot
= nfs4_get_root(s
, &mntfh
);
1882 if (IS_ERR(mntroot
)) {
1883 error
= PTR_ERR(mntroot
);
1884 goto error_splat_super
;
1887 s
->s_flags
|= MS_ACTIVE
;
1889 mnt
->mnt_root
= mntroot
;
1891 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1895 nfs_free_server(server
);
1897 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
1901 up_write(&s
->s_umount
);
1902 deactivate_super(s
);
1903 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
1907 #endif /* CONFIG_NFS_V4 */