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/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/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
50 #include <linux/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
59 #include "delegation.h"
63 #define NFSDBG_FACILITY NFSDBG_VFS
66 /* Mount options that take no arguments */
69 Opt_posix
, Opt_noposix
,
74 Opt_udp
, Opt_tcp
, Opt_rdma
,
76 Opt_rdirplus
, Opt_nordirplus
,
77 Opt_sharecache
, Opt_nosharecache
,
79 /* Mount options that take integer arguments */
81 Opt_rsize
, Opt_wsize
, Opt_bsize
,
82 Opt_timeo
, Opt_retrans
,
83 Opt_acregmin
, Opt_acregmax
,
84 Opt_acdirmin
, Opt_acdirmax
,
91 /* Mount options that take string arguments */
92 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
93 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
95 /* Mount options that are ignored */
96 Opt_userspace
, Opt_deprecated
,
101 static match_table_t nfs_mount_option_tokens
= {
102 { Opt_userspace
, "bg" },
103 { Opt_userspace
, "fg" },
104 { Opt_soft
, "soft" },
105 { Opt_hard
, "hard" },
106 { Opt_intr
, "intr" },
107 { Opt_nointr
, "nointr" },
108 { Opt_posix
, "posix" },
109 { Opt_noposix
, "noposix" },
111 { Opt_nocto
, "nocto" },
113 { Opt_noac
, "noac" },
114 { Opt_lock
, "lock" },
115 { Opt_nolock
, "nolock" },
120 { Opt_rdma
, "rdma" },
122 { Opt_noacl
, "noacl" },
123 { Opt_rdirplus
, "rdirplus" },
124 { Opt_nordirplus
, "nordirplus" },
125 { Opt_sharecache
, "sharecache" },
126 { Opt_nosharecache
, "nosharecache" },
128 { Opt_port
, "port=%u" },
129 { Opt_rsize
, "rsize=%u" },
130 { Opt_wsize
, "wsize=%u" },
131 { Opt_bsize
, "bsize=%u" },
132 { Opt_timeo
, "timeo=%u" },
133 { Opt_retrans
, "retrans=%u" },
134 { Opt_acregmin
, "acregmin=%u" },
135 { Opt_acregmax
, "acregmax=%u" },
136 { Opt_acdirmin
, "acdirmin=%u" },
137 { Opt_acdirmax
, "acdirmax=%u" },
138 { Opt_actimeo
, "actimeo=%u" },
139 { Opt_userspace
, "retry=%u" },
140 { Opt_namelen
, "namlen=%u" },
141 { Opt_mountport
, "mountport=%u" },
142 { Opt_mountvers
, "mountvers=%u" },
143 { Opt_nfsvers
, "nfsvers=%u" },
144 { Opt_nfsvers
, "vers=%u" },
146 { Opt_sec
, "sec=%s" },
147 { Opt_proto
, "proto=%s" },
148 { Opt_mountproto
, "mountproto=%s" },
149 { Opt_addr
, "addr=%s" },
150 { Opt_clientaddr
, "clientaddr=%s" },
151 { Opt_mounthost
, "mounthost=%s" },
152 { Opt_mountaddr
, "mountaddr=%s" },
158 Opt_xprt_udp
, Opt_xprt_tcp
, Opt_xprt_rdma
,
163 static match_table_t nfs_xprt_protocol_tokens
= {
164 { Opt_xprt_udp
, "udp" },
165 { Opt_xprt_tcp
, "tcp" },
166 { Opt_xprt_rdma
, "rdma" },
168 { Opt_xprt_err
, NULL
}
172 Opt_sec_none
, Opt_sec_sys
,
173 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
174 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
175 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
180 static match_table_t nfs_secflavor_tokens
= {
181 { Opt_sec_none
, "none" },
182 { Opt_sec_none
, "null" },
183 { Opt_sec_sys
, "sys" },
185 { Opt_sec_krb5
, "krb5" },
186 { Opt_sec_krb5i
, "krb5i" },
187 { Opt_sec_krb5p
, "krb5p" },
189 { Opt_sec_lkey
, "lkey" },
190 { Opt_sec_lkeyi
, "lkeyi" },
191 { Opt_sec_lkeyp
, "lkeyp" },
193 { Opt_sec_spkm
, "spkm3" },
194 { Opt_sec_spkmi
, "spkm3i" },
195 { Opt_sec_spkmp
, "spkm3p" },
197 { Opt_sec_err
, NULL
}
201 static void nfs_umount_begin(struct vfsmount
*, int);
202 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
203 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
204 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
205 static int nfs_get_sb(struct file_system_type
*, int, const char *, void *, struct vfsmount
*);
206 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
,
207 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
208 static void nfs_kill_super(struct super_block
*);
209 static void nfs_put_super(struct super_block
*);
211 static struct file_system_type nfs_fs_type
= {
212 .owner
= THIS_MODULE
,
214 .get_sb
= nfs_get_sb
,
215 .kill_sb
= nfs_kill_super
,
216 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
219 struct file_system_type nfs_xdev_fs_type
= {
220 .owner
= THIS_MODULE
,
222 .get_sb
= nfs_xdev_get_sb
,
223 .kill_sb
= nfs_kill_super
,
224 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
227 static const struct super_operations nfs_sops
= {
228 .alloc_inode
= nfs_alloc_inode
,
229 .destroy_inode
= nfs_destroy_inode
,
230 .write_inode
= nfs_write_inode
,
231 .put_super
= nfs_put_super
,
232 .statfs
= nfs_statfs
,
233 .clear_inode
= nfs_clear_inode
,
234 .umount_begin
= nfs_umount_begin
,
235 .show_options
= nfs_show_options
,
236 .show_stats
= nfs_show_stats
,
240 static int nfs4_get_sb(struct file_system_type
*fs_type
,
241 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
242 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
,
243 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
244 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
,
245 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
246 static void nfs4_kill_super(struct super_block
*sb
);
248 static struct file_system_type nfs4_fs_type
= {
249 .owner
= THIS_MODULE
,
251 .get_sb
= nfs4_get_sb
,
252 .kill_sb
= nfs4_kill_super
,
253 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
256 struct file_system_type nfs4_xdev_fs_type
= {
257 .owner
= THIS_MODULE
,
259 .get_sb
= nfs4_xdev_get_sb
,
260 .kill_sb
= nfs4_kill_super
,
261 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
264 struct file_system_type nfs4_referral_fs_type
= {
265 .owner
= THIS_MODULE
,
267 .get_sb
= nfs4_referral_get_sb
,
268 .kill_sb
= nfs4_kill_super
,
269 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
272 static const struct super_operations nfs4_sops
= {
273 .alloc_inode
= nfs_alloc_inode
,
274 .destroy_inode
= nfs_destroy_inode
,
275 .write_inode
= nfs_write_inode
,
276 .statfs
= nfs_statfs
,
277 .clear_inode
= nfs4_clear_inode
,
278 .umount_begin
= nfs_umount_begin
,
279 .show_options
= nfs_show_options
,
280 .show_stats
= nfs_show_stats
,
284 static struct shrinker acl_shrinker
= {
285 .shrink
= nfs_access_cache_shrinker
,
286 .seeks
= DEFAULT_SEEKS
,
290 * Register the NFS filesystems
292 int __init
register_nfs_fs(void)
296 ret
= register_filesystem(&nfs_fs_type
);
300 ret
= nfs_register_sysctl();
304 ret
= register_filesystem(&nfs4_fs_type
);
308 register_shrinker(&acl_shrinker
);
313 nfs_unregister_sysctl();
316 unregister_filesystem(&nfs_fs_type
);
322 * Unregister the NFS filesystems
324 void __exit
unregister_nfs_fs(void)
326 unregister_shrinker(&acl_shrinker
);
328 unregister_filesystem(&nfs4_fs_type
);
330 nfs_unregister_sysctl();
331 unregister_filesystem(&nfs_fs_type
);
334 void nfs_sb_active(struct nfs_server
*server
)
336 atomic_inc(&server
->active
);
339 void nfs_sb_deactive(struct nfs_server
*server
)
341 if (atomic_dec_and_test(&server
->active
))
342 wake_up(&server
->active_wq
);
345 static void nfs_put_super(struct super_block
*sb
)
347 struct nfs_server
*server
= NFS_SB(sb
);
349 * Make sure there are no outstanding ops to this server.
350 * If so, wait for them to finish before allowing the
351 * unmount to continue.
353 wait_event(server
->active_wq
, atomic_read(&server
->active
) == 0);
357 * Deliver file system statistics to userspace
359 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
361 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
362 unsigned char blockbits
;
363 unsigned long blockres
;
364 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
365 struct nfs_fattr fattr
;
366 struct nfs_fsstat res
= {
373 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
376 buf
->f_type
= NFS_SUPER_MAGIC
;
379 * Current versions of glibc do not correctly handle the
380 * case where f_frsize != f_bsize. Eventually we want to
381 * report the value of wtmult in this field.
383 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
386 * On most *nix systems, f_blocks, f_bfree, and f_bavail
387 * are reported in units of f_frsize. Linux hasn't had
388 * an f_frsize field in its statfs struct until recently,
389 * thus historically Linux's sys_statfs reports these
390 * fields in units of f_bsize.
392 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
393 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
394 blockres
= (1 << blockbits
) - 1;
395 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
396 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
397 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
399 buf
->f_files
= res
.tfiles
;
400 buf
->f_ffree
= res
.afiles
;
402 buf
->f_namelen
= server
->namelen
;
408 dprintk("%s: statfs error = %d\n", __FUNCTION__
, -error
);
414 * Map the security flavour number to a name
416 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
418 static const struct {
419 rpc_authflavor_t flavour
;
422 { RPC_AUTH_NULL
, "null" },
423 { RPC_AUTH_UNIX
, "sys" },
424 { RPC_AUTH_GSS_KRB5
, "krb5" },
425 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
426 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
427 { RPC_AUTH_GSS_LKEY
, "lkey" },
428 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
429 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
430 { RPC_AUTH_GSS_SPKM
, "spkm" },
431 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
432 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
433 { UINT_MAX
, "unknown" }
437 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
438 if (sec_flavours
[i
].flavour
== flavour
)
441 return sec_flavours
[i
].str
;
444 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
447 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
449 switch (sap
->sa_family
) {
451 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
452 seq_printf(m
, ",mountaddr=" NIPQUAD_FMT
,
453 NIPQUAD(sin
->sin_addr
.s_addr
));
457 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
458 seq_printf(m
, ",mountaddr=" NIP6_FMT
,
459 NIP6(sin6
->sin6_addr
));
464 seq_printf(m
, ",mountaddr=unspecified");
467 if (nfss
->mountd_version
|| showdefaults
)
468 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
469 if (nfss
->mountd_port
|| showdefaults
)
470 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
472 switch (nfss
->mountd_protocol
) {
474 seq_printf(m
, ",mountproto=udp");
477 seq_printf(m
, ",mountproto=tcp");
481 seq_printf(m
, ",mountproto=auto");
486 * Describe the mount options in force on this server representation
488 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
491 static const struct proc_nfs_info
{
496 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
497 { NFS_MOUNT_INTR
, ",intr", ",nointr" },
498 { NFS_MOUNT_POSIX
, ",posix", "" },
499 { NFS_MOUNT_NOCTO
, ",nocto", "" },
500 { NFS_MOUNT_NOAC
, ",noac", "" },
501 { NFS_MOUNT_NONLM
, ",nolock", "" },
502 { NFS_MOUNT_NOACL
, ",noacl", "" },
503 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
504 { NFS_MOUNT_UNSHARED
, ",nosharecache", ""},
507 const struct proc_nfs_info
*nfs_infop
;
508 struct nfs_client
*clp
= nfss
->nfs_client
;
509 u32 version
= clp
->rpc_ops
->version
;
511 seq_printf(m
, ",vers=%u", version
);
512 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
513 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
514 if (nfss
->bsize
!= 0)
515 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
516 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
517 if (nfss
->acregmin
!= 3*HZ
|| showdefaults
)
518 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
519 if (nfss
->acregmax
!= 60*HZ
|| showdefaults
)
520 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
521 if (nfss
->acdirmin
!= 30*HZ
|| showdefaults
)
522 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
523 if (nfss
->acdirmax
!= 60*HZ
|| showdefaults
)
524 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
525 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
526 if (nfss
->flags
& nfs_infop
->flag
)
527 seq_puts(m
, nfs_infop
->str
);
529 seq_puts(m
, nfs_infop
->nostr
);
531 seq_printf(m
, ",proto=%s",
532 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_PROTO
));
534 if (nfss
->port
!= NFS_PORT
)
535 seq_printf(m
, ",port=%u", nfss
->port
);
538 seq_printf(m
, ",port=%u", nfss
->port
);
540 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
541 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
542 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
545 nfs_show_mountd_options(m
, nfss
, showdefaults
);
548 if (clp
->rpc_ops
->version
== 4)
549 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
554 * Describe the mount options on this VFS mountpoint
556 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
558 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
560 nfs_show_mount_options(m
, nfss
, 0);
562 seq_printf(m
, ",addr=%s",
563 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
570 * Present statistical information for this VFS mountpoint
572 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
575 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
576 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
577 struct nfs_iostats totals
= { };
579 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
582 * Display all mount option settings
584 seq_printf(m
, "\n\topts:\t");
585 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
586 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
587 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
588 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
589 nfs_show_mount_options(m
, nfss
, 1);
591 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
593 seq_printf(m
, "\n\tcaps:\t");
594 seq_printf(m
, "caps=0x%x", nfss
->caps
);
595 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
596 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
597 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
598 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
601 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
602 seq_printf(m
, "\n\tnfsv4:\t");
603 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
604 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
605 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
610 * Display security flavor in effect for this mount
612 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
614 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
617 * Display superblock I/O counters
619 for_each_possible_cpu(cpu
) {
620 struct nfs_iostats
*stats
;
623 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
625 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
626 totals
.events
[i
] += stats
->events
[i
];
627 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
628 totals
.bytes
[i
] += stats
->bytes
[i
];
633 seq_printf(m
, "\n\tevents:\t");
634 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
635 seq_printf(m
, "%lu ", totals
.events
[i
]);
636 seq_printf(m
, "\n\tbytes:\t");
637 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
638 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
641 rpc_print_iostats(m
, nfss
->client
);
647 * Begin unmount by attempting to remove all automounted mountpoints we added
648 * in response to xdev traversals and referrals
650 static void nfs_umount_begin(struct vfsmount
*vfsmnt
, int flags
)
652 struct nfs_server
*server
= NFS_SB(vfsmnt
->mnt_sb
);
653 struct rpc_clnt
*rpc
;
655 if (!(flags
& MNT_FORCE
))
657 /* -EIO all pending I/O */
658 rpc
= server
->client_acl
;
660 rpc_killall_tasks(rpc
);
661 rpc
= server
->client
;
663 rpc_killall_tasks(rpc
);
667 * Set the port number in an address. Be agnostic about the address family.
669 static void nfs_set_port(struct sockaddr
*sap
, unsigned short port
)
671 switch (sap
->sa_family
) {
673 struct sockaddr_in
*ap
= (struct sockaddr_in
*)sap
;
674 ap
->sin_port
= htons(port
);
678 struct sockaddr_in6
*ap
= (struct sockaddr_in6
*)sap
;
679 ap
->sin6_port
= htons(port
);
686 * Sanity-check a server address provided by the mount command.
688 * Address family must be initialized, and address must not be
689 * the ANY address for that family.
691 static int nfs_verify_server_address(struct sockaddr
*addr
)
693 switch (addr
->sa_family
) {
695 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
696 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
699 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
700 return !ipv6_addr_any(sa
);
708 * Parse string addresses passed in via a mount option,
709 * and construct a sockaddr based on the result.
711 * If address parsing fails, set the sockaddr's address
712 * family to AF_UNSPEC to force nfs_verify_server_address()
715 static void nfs_parse_server_address(char *value
,
716 struct sockaddr
*sap
,
719 if (strchr(value
, ':')) {
720 struct sockaddr_in6
*ap
= (struct sockaddr_in6
*)sap
;
721 u8
*addr
= (u8
*)&ap
->sin6_addr
.in6_u
;
723 ap
->sin6_family
= AF_INET6
;
725 if (in6_pton(value
, -1, addr
, '\0', NULL
))
728 struct sockaddr_in
*ap
= (struct sockaddr_in
*)sap
;
729 u8
*addr
= (u8
*)&ap
->sin_addr
.s_addr
;
731 ap
->sin_family
= AF_INET
;
733 if (in4_pton(value
, -1, addr
, '\0', NULL
))
737 sap
->sa_family
= AF_UNSPEC
;
742 * Error-check and convert a string of mount options from user space into
745 static int nfs_parse_mount_options(char *raw
,
746 struct nfs_parsed_mount_data
*mnt
)
748 char *p
, *string
, *secdata
;
752 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
755 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
757 secdata
= alloc_secdata();
761 rc
= security_sb_copy_data(raw
, secdata
);
763 goto out_security_failure
;
765 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
767 goto out_security_failure
;
769 free_secdata(secdata
);
771 while ((p
= strsep(&raw
, ",")) != NULL
) {
772 substring_t args
[MAX_OPT_ARGS
];
778 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
780 token
= match_token(p
, nfs_mount_option_tokens
, args
);
783 mnt
->flags
|= NFS_MOUNT_SOFT
;
786 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
792 mnt
->flags
|= NFS_MOUNT_POSIX
;
795 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
798 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
801 mnt
->flags
|= NFS_MOUNT_NOCTO
;
804 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
807 mnt
->flags
|= NFS_MOUNT_NOAC
;
810 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
813 mnt
->flags
|= NFS_MOUNT_NONLM
;
816 mnt
->flags
&= ~NFS_MOUNT_VER3
;
819 mnt
->flags
|= NFS_MOUNT_VER3
;
822 mnt
->flags
&= ~NFS_MOUNT_TCP
;
823 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
828 mnt
->flags
|= NFS_MOUNT_TCP
;
829 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
834 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
835 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
840 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
843 mnt
->flags
|= NFS_MOUNT_NOACL
;
846 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
849 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
852 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
854 case Opt_nosharecache
:
855 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
859 if (match_int(args
, &option
))
861 if (option
< 0 || option
> 65535)
863 mnt
->nfs_server
.port
= option
;
866 if (match_int(args
, &mnt
->rsize
))
870 if (match_int(args
, &mnt
->wsize
))
874 if (match_int(args
, &option
))
881 if (match_int(args
, &mnt
->timeo
))
885 if (match_int(args
, &mnt
->retrans
))
889 if (match_int(args
, &mnt
->acregmin
))
893 if (match_int(args
, &mnt
->acregmax
))
897 if (match_int(args
, &mnt
->acdirmin
))
901 if (match_int(args
, &mnt
->acdirmax
))
905 if (match_int(args
, &option
))
912 mnt
->acdirmax
= option
;
915 if (match_int(args
, &mnt
->namlen
))
919 if (match_int(args
, &option
))
921 if (option
< 0 || option
> 65535)
923 mnt
->mount_server
.port
= option
;
926 if (match_int(args
, &option
))
930 mnt
->mount_server
.version
= option
;
933 if (match_int(args
, &option
))
937 mnt
->flags
&= ~NFS_MOUNT_VER3
;
940 mnt
->flags
|= NFS_MOUNT_VER3
;
948 string
= match_strdup(args
);
951 token
= match_token(string
, nfs_secflavor_tokens
, args
);
955 * The flags setting is for v2/v3. The flavor_len
956 * setting is for v4. v2/v3 also need to know the
957 * difference between NULL and UNIX.
961 mnt
->flags
&= ~NFS_MOUNT_SECFLAVOUR
;
962 mnt
->auth_flavor_len
= 0;
963 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
966 mnt
->flags
&= ~NFS_MOUNT_SECFLAVOUR
;
967 mnt
->auth_flavor_len
= 0;
968 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
971 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
972 mnt
->auth_flavor_len
= 1;
973 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
976 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
977 mnt
->auth_flavor_len
= 1;
978 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
981 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
982 mnt
->auth_flavor_len
= 1;
983 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
986 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
987 mnt
->auth_flavor_len
= 1;
988 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
991 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
992 mnt
->auth_flavor_len
= 1;
993 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
996 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
997 mnt
->auth_flavor_len
= 1;
998 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
1001 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1002 mnt
->auth_flavor_len
= 1;
1003 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
1006 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1007 mnt
->auth_flavor_len
= 1;
1008 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
1011 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
1012 mnt
->auth_flavor_len
= 1;
1013 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
1020 string
= match_strdup(args
);
1023 token
= match_token(string
,
1024 nfs_xprt_protocol_tokens
, args
);
1029 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1030 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1035 mnt
->flags
|= NFS_MOUNT_TCP
;
1036 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1041 /* vector side protocols to TCP */
1042 mnt
->flags
|= NFS_MOUNT_TCP
;
1043 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1048 goto out_unrec_xprt
;
1051 case Opt_mountproto
:
1052 string
= match_strdup(args
);
1055 token
= match_token(string
,
1056 nfs_xprt_protocol_tokens
, args
);
1061 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1064 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1066 case Opt_xprt_rdma
: /* not used for side protocols */
1068 goto out_unrec_xprt
;
1072 string
= match_strdup(args
);
1075 nfs_parse_server_address(string
, (struct sockaddr
*)
1076 &mnt
->nfs_server
.address
,
1077 &mnt
->nfs_server
.addrlen
);
1080 case Opt_clientaddr
:
1081 string
= match_strdup(args
);
1084 kfree(mnt
->client_address
);
1085 mnt
->client_address
= string
;
1088 string
= match_strdup(args
);
1091 kfree(mnt
->mount_server
.hostname
);
1092 mnt
->mount_server
.hostname
= string
;
1095 string
= match_strdup(args
);
1098 nfs_parse_server_address(string
, (struct sockaddr
*)
1099 &mnt
->mount_server
.address
,
1100 &mnt
->mount_server
.addrlen
);
1105 case Opt_deprecated
:
1113 nfs_set_port((struct sockaddr
*)&mnt
->nfs_server
.address
,
1114 mnt
->nfs_server
.port
);
1119 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1121 out_security_failure
:
1122 free_secdata(secdata
);
1123 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1126 printk(KERN_INFO
"NFS: unrecognized NFS version number\n");
1130 printk(KERN_INFO
"NFS: unrecognized transport protocol\n");
1134 printk(KERN_INFO
"NFS: unrecognized security flavor\n");
1138 printk(KERN_INFO
"NFS: unknown mount option: %s\n", p
);
1143 * Use the remote server's MOUNT service to request the NFS file handle
1144 * corresponding to the provided path.
1146 static int nfs_try_mount(struct nfs_parsed_mount_data
*args
,
1147 struct nfs_fh
*root_fh
)
1149 struct sockaddr
*sap
= (struct sockaddr
*)&args
->mount_server
.address
;
1153 if (args
->mount_server
.version
== 0) {
1154 if (args
->flags
& NFS_MOUNT_VER3
)
1155 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1157 args
->mount_server
.version
= NFS_MNT_VERSION
;
1160 if (args
->mount_server
.hostname
)
1161 hostname
= args
->mount_server
.hostname
;
1163 hostname
= args
->nfs_server
.hostname
;
1166 * Construct the mount server's address.
1168 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1169 memcpy(sap
, &args
->nfs_server
.address
,
1170 args
->nfs_server
.addrlen
);
1171 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1175 * autobind will be used if mount_server.port == 0
1177 nfs_set_port(sap
, args
->mount_server
.port
);
1180 * Now ask the mount server to map our export path
1183 status
= nfs_mount(sap
,
1184 args
->mount_server
.addrlen
,
1186 args
->nfs_server
.export_path
,
1187 args
->mount_server
.version
,
1188 args
->mount_server
.protocol
,
1193 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d",
1199 * Validate the NFS2/NFS3 mount data
1200 * - fills in the mount root filehandle
1202 * For option strings, user space handles the following behaviors:
1204 * + DNS: mapping server host name to IP address ("addr=" option)
1206 * + failure mode: how to behave if a mount request can't be handled
1207 * immediately ("fg/bg" option)
1209 * + retry: how often to retry a mount request ("retry=" option)
1211 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1212 * mountproto=tcp after mountproto=udp, and so on
1214 static int nfs_validate_mount_data(void *options
,
1215 struct nfs_parsed_mount_data
*args
,
1216 struct nfs_fh
*mntfh
,
1217 const char *dev_name
)
1219 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1221 memset(args
, 0, sizeof(*args
));
1226 args
->flags
= (NFS_MOUNT_VER3
| NFS_MOUNT_TCP
);
1227 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1228 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1232 args
->acregmax
= 60;
1233 args
->acdirmin
= 30;
1234 args
->acdirmax
= 60;
1235 args
->mount_server
.port
= 0; /* autobind unless user sets port */
1236 args
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1237 args
->nfs_server
.port
= 0; /* autobind unless user sets port */
1238 args
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1240 switch (data
->version
) {
1246 if (data
->flags
& NFS_MOUNT_VER3
)
1248 data
->root
.size
= NFS2_FHSIZE
;
1249 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1251 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1254 memset(data
->context
, 0, sizeof(data
->context
));
1256 if (data
->flags
& NFS_MOUNT_VER3
)
1257 mntfh
->size
= data
->root
.size
;
1259 mntfh
->size
= NFS2_FHSIZE
;
1261 if (mntfh
->size
> sizeof(mntfh
->data
))
1262 goto out_invalid_fh
;
1264 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1265 if (mntfh
->size
< sizeof(mntfh
->data
))
1266 memset(mntfh
->data
+ mntfh
->size
, 0,
1267 sizeof(mntfh
->data
) - mntfh
->size
);
1270 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1273 args
->flags
= data
->flags
;
1274 args
->rsize
= data
->rsize
;
1275 args
->wsize
= data
->wsize
;
1276 args
->timeo
= data
->timeo
;
1277 args
->retrans
= data
->retrans
;
1278 args
->acregmin
= data
->acregmin
;
1279 args
->acregmax
= data
->acregmax
;
1280 args
->acdirmin
= data
->acdirmin
;
1281 args
->acdirmax
= data
->acdirmax
;
1283 memcpy(&args
->nfs_server
.address
, &data
->addr
,
1284 sizeof(data
->addr
));
1285 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1286 if (!nfs_verify_server_address((struct sockaddr
*)
1287 &args
->nfs_server
.address
))
1288 goto out_no_address
;
1290 if (!(data
->flags
& NFS_MOUNT_TCP
))
1291 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1292 /* N.B. caller will free nfs_server.hostname in all cases */
1293 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1294 args
->namlen
= data
->namlen
;
1295 args
->bsize
= data
->bsize
;
1296 args
->auth_flavors
[0] = data
->pseudoflavor
;
1297 if (!args
->nfs_server
.hostname
)
1301 * The legacy version 6 binary mount data from userspace has a
1302 * field used only to transport selinux information into the
1303 * the kernel. To continue to support that functionality we
1304 * have a touch of selinux knowledge here in the NFS code. The
1305 * userspace code converted context=blah to just blah so we are
1306 * converting back to the full string selinux understands.
1308 if (data
->context
[0]){
1309 #ifdef CONFIG_SECURITY_SELINUX
1311 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1314 strcpy(opts_str
, "context=");
1315 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1316 strcat(opts_str
, &data
->context
[0]);
1317 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1332 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1335 if (!nfs_verify_server_address((struct sockaddr
*)
1336 &args
->nfs_server
.address
))
1337 goto out_no_address
;
1339 c
= strchr(dev_name
, ':');
1343 /* N.B. caller will free nfs_server.hostname in all cases */
1344 args
->nfs_server
.hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1345 if (!args
->nfs_server
.hostname
)
1349 if (strlen(c
) > NFS_MAXPATHLEN
)
1350 return -ENAMETOOLONG
;
1351 args
->nfs_server
.export_path
= c
;
1353 status
= nfs_try_mount(args
, mntfh
);
1361 if (!(args
->flags
& NFS_MOUNT_SECFLAVOUR
))
1362 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1364 #ifndef CONFIG_NFS_V3
1365 if (args
->flags
& NFS_MOUNT_VER3
)
1366 goto out_v3_not_compiled
;
1367 #endif /* !CONFIG_NFS_V3 */
1372 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1376 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1381 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1384 #ifndef CONFIG_NFS_V3
1385 out_v3_not_compiled
:
1386 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1387 return -EPROTONOSUPPORT
;
1388 #endif /* !CONFIG_NFS_V3 */
1391 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1395 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1399 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1404 * Initialise the common bits of the superblock
1406 static inline void nfs_initialise_sb(struct super_block
*sb
)
1408 struct nfs_server
*server
= NFS_SB(sb
);
1410 sb
->s_magic
= NFS_SUPER_MAGIC
;
1412 /* We probably want something more informative here */
1413 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
1414 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
1416 if (sb
->s_blocksize
== 0)
1417 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
1418 &sb
->s_blocksize_bits
);
1420 if (server
->flags
& NFS_MOUNT_NOAC
)
1421 sb
->s_flags
|= MS_SYNCHRONOUS
;
1423 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
1427 * Finish setting up an NFS2/3 superblock
1429 static void nfs_fill_super(struct super_block
*sb
,
1430 struct nfs_parsed_mount_data
*data
)
1432 struct nfs_server
*server
= NFS_SB(sb
);
1434 sb
->s_blocksize_bits
= 0;
1435 sb
->s_blocksize
= 0;
1437 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
1439 if (server
->flags
& NFS_MOUNT_VER3
) {
1440 /* The VFS shouldn't apply the umask to mode bits. We will do
1441 * so ourselves when necessary.
1443 sb
->s_flags
|= MS_POSIXACL
;
1444 sb
->s_time_gran
= 1;
1447 sb
->s_op
= &nfs_sops
;
1448 nfs_initialise_sb(sb
);
1452 * Finish setting up a cloned NFS2/3 superblock
1454 static void nfs_clone_super(struct super_block
*sb
,
1455 const struct super_block
*old_sb
)
1457 struct nfs_server
*server
= NFS_SB(sb
);
1459 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1460 sb
->s_blocksize
= old_sb
->s_blocksize
;
1461 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1463 if (server
->flags
& NFS_MOUNT_VER3
) {
1464 /* The VFS shouldn't apply the umask to mode bits. We will do
1465 * so ourselves when necessary.
1467 sb
->s_flags
|= MS_POSIXACL
;
1468 sb
->s_time_gran
= 1;
1471 sb
->s_op
= old_sb
->s_op
;
1472 nfs_initialise_sb(sb
);
1475 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1477 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
1479 const struct nfs_server
*a
= s
->s_fs_info
;
1480 const struct rpc_clnt
*clnt_a
= a
->client
;
1481 const struct rpc_clnt
*clnt_b
= b
->client
;
1483 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
1485 if (a
->nfs_client
!= b
->nfs_client
)
1487 if (a
->flags
!= b
->flags
)
1489 if (a
->wsize
!= b
->wsize
)
1491 if (a
->rsize
!= b
->rsize
)
1493 if (a
->acregmin
!= b
->acregmin
)
1495 if (a
->acregmax
!= b
->acregmax
)
1497 if (a
->acdirmin
!= b
->acdirmin
)
1499 if (a
->acdirmax
!= b
->acdirmax
)
1501 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
1508 struct nfs_sb_mountdata
{
1509 struct nfs_server
*server
;
1513 static int nfs_set_super(struct super_block
*s
, void *data
)
1515 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1516 struct nfs_server
*server
= sb_mntdata
->server
;
1519 s
->s_flags
= sb_mntdata
->mntflags
;
1520 s
->s_fs_info
= server
;
1521 ret
= set_anon_super(s
, server
);
1523 server
->s_dev
= s
->s_dev
;
1527 static int nfs_compare_super_address(struct nfs_server
*server1
,
1528 struct nfs_server
*server2
)
1530 struct sockaddr
*sap1
, *sap2
;
1532 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
1533 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
1535 if (sap1
->sa_family
!= sap2
->sa_family
)
1538 switch (sap1
->sa_family
) {
1540 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
1541 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
1542 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
1544 if (sin1
->sin_port
!= sin2
->sin_port
)
1549 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
1550 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
1551 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
1553 if (sin1
->sin6_port
!= sin2
->sin6_port
)
1564 static int nfs_compare_super(struct super_block
*sb
, void *data
)
1566 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1567 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
1568 int mntflags
= sb_mntdata
->mntflags
;
1570 if (!nfs_compare_super_address(old
, server
))
1572 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1573 if (old
->flags
& NFS_MOUNT_UNSHARED
)
1575 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
1577 return nfs_compare_mount_options(sb
, server
, mntflags
);
1580 static int nfs_get_sb(struct file_system_type
*fs_type
,
1581 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1583 struct nfs_server
*server
= NULL
;
1584 struct super_block
*s
;
1585 struct nfs_fh mntfh
;
1586 struct nfs_parsed_mount_data data
;
1587 struct dentry
*mntroot
;
1588 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1589 struct nfs_sb_mountdata sb_mntdata
= {
1594 security_init_mnt_opts(&data
.lsm_opts
);
1596 /* Validate the mount data */
1597 error
= nfs_validate_mount_data(raw_data
, &data
, &mntfh
, dev_name
);
1601 /* Get a volume representation */
1602 server
= nfs_create_server(&data
, &mntfh
);
1603 if (IS_ERR(server
)) {
1604 error
= PTR_ERR(server
);
1607 sb_mntdata
.server
= server
;
1609 if (server
->flags
& NFS_MOUNT_UNSHARED
)
1610 compare_super
= NULL
;
1612 /* Get a superblock - note that we may end up sharing one that already exists */
1613 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1619 if (s
->s_fs_info
!= server
) {
1620 nfs_free_server(server
);
1625 /* initial superblock/root creation */
1626 nfs_fill_super(s
, &data
);
1629 mntroot
= nfs_get_root(s
, &mntfh
);
1630 if (IS_ERR(mntroot
)) {
1631 error
= PTR_ERR(mntroot
);
1632 goto error_splat_super
;
1635 error
= security_sb_set_mnt_opts(s
, &data
.lsm_opts
);
1637 goto error_splat_root
;
1639 s
->s_flags
|= MS_ACTIVE
;
1641 mnt
->mnt_root
= mntroot
;
1645 kfree(data
.nfs_server
.hostname
);
1646 kfree(data
.mount_server
.hostname
);
1647 security_free_mnt_opts(&data
.lsm_opts
);
1651 nfs_free_server(server
);
1657 up_write(&s
->s_umount
);
1658 deactivate_super(s
);
1663 * Destroy an NFS2/3 superblock
1665 static void nfs_kill_super(struct super_block
*s
)
1667 struct nfs_server
*server
= NFS_SB(s
);
1670 nfs_free_server(server
);
1674 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1676 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
1677 const char *dev_name
, void *raw_data
,
1678 struct vfsmount
*mnt
)
1680 struct nfs_clone_mount
*data
= raw_data
;
1681 struct super_block
*s
;
1682 struct nfs_server
*server
;
1683 struct dentry
*mntroot
;
1684 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1685 struct nfs_sb_mountdata sb_mntdata
= {
1690 dprintk("--> nfs_xdev_get_sb()\n");
1692 /* create a new volume representation */
1693 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
1694 if (IS_ERR(server
)) {
1695 error
= PTR_ERR(server
);
1696 goto out_err_noserver
;
1698 sb_mntdata
.server
= server
;
1700 if (server
->flags
& NFS_MOUNT_UNSHARED
)
1701 compare_super
= NULL
;
1703 /* Get a superblock - note that we may end up sharing one that already exists */
1704 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1710 if (s
->s_fs_info
!= server
) {
1711 nfs_free_server(server
);
1716 /* initial superblock/root creation */
1717 nfs_clone_super(s
, data
->sb
);
1720 mntroot
= nfs_get_root(s
, data
->fh
);
1721 if (IS_ERR(mntroot
)) {
1722 error
= PTR_ERR(mntroot
);
1723 goto error_splat_super
;
1725 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
1728 goto error_splat_super
;
1731 s
->s_flags
|= MS_ACTIVE
;
1733 mnt
->mnt_root
= mntroot
;
1735 /* clone any lsm security options from the parent to the new sb */
1736 security_sb_clone_mnt_opts(data
->sb
, s
);
1738 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1742 nfs_free_server(server
);
1744 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error
);
1748 up_write(&s
->s_umount
);
1749 deactivate_super(s
);
1750 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error
);
1754 #ifdef CONFIG_NFS_V4
1757 * Finish setting up a cloned NFS4 superblock
1759 static void nfs4_clone_super(struct super_block
*sb
,
1760 const struct super_block
*old_sb
)
1762 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1763 sb
->s_blocksize
= old_sb
->s_blocksize
;
1764 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1765 sb
->s_time_gran
= 1;
1766 sb
->s_op
= old_sb
->s_op
;
1767 nfs_initialise_sb(sb
);
1771 * Set up an NFS4 superblock
1773 static void nfs4_fill_super(struct super_block
*sb
)
1775 sb
->s_time_gran
= 1;
1776 sb
->s_op
= &nfs4_sops
;
1777 nfs_initialise_sb(sb
);
1781 * Validate NFSv4 mount options
1783 static int nfs4_validate_mount_data(void *options
,
1784 struct nfs_parsed_mount_data
*args
,
1785 const char *dev_name
)
1787 struct sockaddr_in
*ap
;
1788 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
1791 memset(args
, 0, sizeof(*args
));
1796 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1797 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1801 args
->acregmax
= 60;
1802 args
->acdirmin
= 30;
1803 args
->acdirmax
= 60;
1804 args
->nfs_server
.port
= NFS_PORT
; /* 2049 unless user set port= */
1805 args
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1807 switch (data
->version
) {
1809 ap
= (struct sockaddr_in
*)&args
->nfs_server
.address
;
1810 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
1811 goto out_no_address
;
1812 if (data
->host_addrlen
== 0)
1813 goto out_no_address
;
1814 args
->nfs_server
.addrlen
= data
->host_addrlen
;
1815 if (copy_from_user(ap
, data
->host_addr
, data
->host_addrlen
))
1817 if (!nfs_verify_server_address((struct sockaddr
*)
1818 &args
->nfs_server
.address
))
1819 goto out_no_address
;
1821 switch (data
->auth_flavourlen
) {
1823 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1826 if (copy_from_user(&args
->auth_flavors
[0],
1827 data
->auth_flavours
,
1828 sizeof(args
->auth_flavors
[0])))
1832 goto out_inval_auth
;
1835 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
1838 args
->nfs_server
.hostname
= c
;
1840 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
1843 args
->nfs_server
.export_path
= c
;
1844 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
1846 c
= strndup_user(data
->client_addr
.data
, 16);
1849 args
->client_address
= c
;
1852 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1856 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
1857 args
->rsize
= data
->rsize
;
1858 args
->wsize
= data
->wsize
;
1859 args
->timeo
= data
->timeo
;
1860 args
->retrans
= data
->retrans
;
1861 args
->acregmin
= data
->acregmin
;
1862 args
->acregmax
= data
->acregmax
;
1863 args
->acdirmin
= data
->acdirmin
;
1864 args
->acdirmax
= data
->acdirmax
;
1865 args
->nfs_server
.protocol
= data
->proto
;
1871 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1874 if (!nfs_verify_server_address((struct sockaddr
*)
1875 &args
->nfs_server
.address
))
1878 switch (args
->auth_flavor_len
) {
1880 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1885 goto out_inval_auth
;
1889 * Split "dev_name" into "hostname:mntpath".
1891 c
= strchr(dev_name
, ':');
1894 /* while calculating len, pretend ':' is '\0' */
1896 if (len
> NFS4_MAXNAMLEN
)
1897 return -ENAMETOOLONG
;
1898 /* N.B. caller will free nfs_server.hostname in all cases */
1899 args
->nfs_server
.hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1900 if (!args
->nfs_server
.hostname
)
1903 c
++; /* step over the ':' */
1905 if (len
> NFS4_MAXPATHLEN
)
1906 return -ENAMETOOLONG
;
1907 args
->nfs_server
.export_path
= kstrndup(c
, len
, GFP_KERNEL
);
1908 if (!args
->nfs_server
.export_path
)
1911 dprintk("NFS: MNTPATH: '%s'\n", args
->nfs_server
.export_path
);
1913 if (args
->client_address
== NULL
)
1914 goto out_no_client_address
;
1923 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
1927 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
1928 data
->auth_flavourlen
);
1932 dfprintk(MOUNT
, "NFS4: not enough memory to handle mount options\n");
1936 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
1939 out_no_client_address
:
1940 dfprintk(MOUNT
, "NFS4: mount program didn't pass callback address\n");
1945 * Get the superblock for an NFS4 mountpoint
1947 static int nfs4_get_sb(struct file_system_type
*fs_type
,
1948 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1950 struct nfs_parsed_mount_data data
;
1951 struct super_block
*s
;
1952 struct nfs_server
*server
;
1953 struct nfs_fh mntfh
;
1954 struct dentry
*mntroot
;
1955 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1956 struct nfs_sb_mountdata sb_mntdata
= {
1961 security_init_mnt_opts(&data
.lsm_opts
);
1963 /* Validate the mount data */
1964 error
= nfs4_validate_mount_data(raw_data
, &data
, dev_name
);
1968 /* Get a volume representation */
1969 server
= nfs4_create_server(&data
, &mntfh
);
1970 if (IS_ERR(server
)) {
1971 error
= PTR_ERR(server
);
1974 sb_mntdata
.server
= server
;
1976 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
1977 compare_super
= NULL
;
1979 /* Get a superblock - note that we may end up sharing one that already exists */
1980 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1986 if (s
->s_fs_info
!= server
) {
1987 nfs_free_server(server
);
1992 /* initial superblock/root creation */
1996 mntroot
= nfs4_get_root(s
, &mntfh
);
1997 if (IS_ERR(mntroot
)) {
1998 error
= PTR_ERR(mntroot
);
1999 goto error_splat_super
;
2002 s
->s_flags
|= MS_ACTIVE
;
2004 mnt
->mnt_root
= mntroot
;
2008 kfree(data
.client_address
);
2009 kfree(data
.nfs_server
.export_path
);
2010 kfree(data
.nfs_server
.hostname
);
2011 security_free_mnt_opts(&data
.lsm_opts
);
2015 nfs_free_server(server
);
2019 up_write(&s
->s_umount
);
2020 deactivate_super(s
);
2024 static void nfs4_kill_super(struct super_block
*sb
)
2026 struct nfs_server
*server
= NFS_SB(sb
);
2028 nfs_return_all_delegations(sb
);
2029 kill_anon_super(sb
);
2031 nfs4_renewd_prepare_shutdown(server
);
2032 nfs_free_server(server
);
2036 * Clone an NFS4 server record on xdev traversal (FSID-change)
2038 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
2039 const char *dev_name
, void *raw_data
,
2040 struct vfsmount
*mnt
)
2042 struct nfs_clone_mount
*data
= raw_data
;
2043 struct super_block
*s
;
2044 struct nfs_server
*server
;
2045 struct dentry
*mntroot
;
2046 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2047 struct nfs_sb_mountdata sb_mntdata
= {
2052 dprintk("--> nfs4_xdev_get_sb()\n");
2054 /* create a new volume representation */
2055 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
2056 if (IS_ERR(server
)) {
2057 error
= PTR_ERR(server
);
2058 goto out_err_noserver
;
2060 sb_mntdata
.server
= server
;
2062 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2063 compare_super
= NULL
;
2065 /* Get a superblock - note that we may end up sharing one that already exists */
2066 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2072 if (s
->s_fs_info
!= server
) {
2073 nfs_free_server(server
);
2078 /* initial superblock/root creation */
2079 nfs4_clone_super(s
, data
->sb
);
2082 mntroot
= nfs4_get_root(s
, data
->fh
);
2083 if (IS_ERR(mntroot
)) {
2084 error
= PTR_ERR(mntroot
);
2085 goto error_splat_super
;
2087 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2090 goto error_splat_super
;
2093 s
->s_flags
|= MS_ACTIVE
;
2095 mnt
->mnt_root
= mntroot
;
2097 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2101 nfs_free_server(server
);
2103 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error
);
2107 up_write(&s
->s_umount
);
2108 deactivate_super(s
);
2109 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error
);
2114 * Create an NFS4 server record on referral traversal
2116 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
, int flags
,
2117 const char *dev_name
, void *raw_data
,
2118 struct vfsmount
*mnt
)
2120 struct nfs_clone_mount
*data
= raw_data
;
2121 struct super_block
*s
;
2122 struct nfs_server
*server
;
2123 struct dentry
*mntroot
;
2124 struct nfs_fh mntfh
;
2125 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2126 struct nfs_sb_mountdata sb_mntdata
= {
2131 dprintk("--> nfs4_referral_get_sb()\n");
2133 /* create a new volume representation */
2134 server
= nfs4_create_referral_server(data
, &mntfh
);
2135 if (IS_ERR(server
)) {
2136 error
= PTR_ERR(server
);
2137 goto out_err_noserver
;
2139 sb_mntdata
.server
= server
;
2141 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2142 compare_super
= NULL
;
2144 /* Get a superblock - note that we may end up sharing one that already exists */
2145 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2151 if (s
->s_fs_info
!= server
) {
2152 nfs_free_server(server
);
2157 /* initial superblock/root creation */
2161 mntroot
= nfs4_get_root(s
, &mntfh
);
2162 if (IS_ERR(mntroot
)) {
2163 error
= PTR_ERR(mntroot
);
2164 goto error_splat_super
;
2166 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2169 goto error_splat_super
;
2172 s
->s_flags
|= MS_ACTIVE
;
2174 mnt
->mnt_root
= mntroot
;
2176 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2180 nfs_free_server(server
);
2182 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
2186 up_write(&s
->s_umount
);
2187 deactivate_super(s
);
2188 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
2192 #endif /* CONFIG_NFS_V4 */