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/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/netdevice.h>
51 #include <linux/nfs_xdr.h>
52 #include <linux/magic.h>
53 #include <linux/parser.h>
55 #include <asm/system.h>
56 #include <asm/uaccess.h>
60 #include "delegation.h"
65 #define NFSDBG_FACILITY NFSDBG_VFS
68 /* Mount options that take no arguments */
70 Opt_posix
, Opt_noposix
,
75 Opt_udp
, Opt_tcp
, Opt_rdma
,
77 Opt_rdirplus
, Opt_nordirplus
,
78 Opt_sharecache
, Opt_nosharecache
,
79 Opt_resvport
, Opt_noresvport
,
80 Opt_fscache
, Opt_nofscache
,
82 /* Mount options that take integer arguments */
84 Opt_rsize
, Opt_wsize
, Opt_bsize
,
85 Opt_timeo
, Opt_retrans
,
86 Opt_acregmin
, Opt_acregmax
,
87 Opt_acdirmin
, Opt_acdirmax
,
94 /* Mount options that take string arguments */
95 Opt_sec
, Opt_proto
, Opt_mountproto
, Opt_mounthost
,
96 Opt_addr
, Opt_mountaddr
, Opt_clientaddr
,
100 /* Special mount options */
101 Opt_userspace
, Opt_deprecated
, Opt_sloppy
,
106 static const match_table_t nfs_mount_option_tokens
= {
107 { Opt_userspace
, "bg" },
108 { Opt_userspace
, "fg" },
109 { Opt_userspace
, "retry=%s" },
111 { Opt_sloppy
, "sloppy" },
113 { Opt_soft
, "soft" },
114 { Opt_hard
, "hard" },
115 { Opt_deprecated
, "intr" },
116 { Opt_deprecated
, "nointr" },
117 { Opt_posix
, "posix" },
118 { Opt_noposix
, "noposix" },
120 { Opt_nocto
, "nocto" },
122 { Opt_noac
, "noac" },
123 { Opt_lock
, "lock" },
124 { Opt_nolock
, "nolock" },
129 { Opt_rdma
, "rdma" },
131 { Opt_noacl
, "noacl" },
132 { Opt_rdirplus
, "rdirplus" },
133 { Opt_nordirplus
, "nordirplus" },
134 { Opt_sharecache
, "sharecache" },
135 { Opt_nosharecache
, "nosharecache" },
136 { Opt_resvport
, "resvport" },
137 { Opt_noresvport
, "noresvport" },
138 { Opt_fscache
, "fsc" },
139 { Opt_fscache_uniq
, "fsc=%s" },
140 { Opt_nofscache
, "nofsc" },
142 { Opt_port
, "port=%u" },
143 { Opt_rsize
, "rsize=%u" },
144 { Opt_wsize
, "wsize=%u" },
145 { Opt_bsize
, "bsize=%u" },
146 { Opt_timeo
, "timeo=%u" },
147 { Opt_retrans
, "retrans=%u" },
148 { Opt_acregmin
, "acregmin=%u" },
149 { Opt_acregmax
, "acregmax=%u" },
150 { Opt_acdirmin
, "acdirmin=%u" },
151 { Opt_acdirmax
, "acdirmax=%u" },
152 { Opt_actimeo
, "actimeo=%u" },
153 { Opt_namelen
, "namlen=%u" },
154 { Opt_mountport
, "mountport=%u" },
155 { Opt_mountvers
, "mountvers=%u" },
156 { Opt_nfsvers
, "nfsvers=%u" },
157 { Opt_nfsvers
, "vers=%u" },
159 { Opt_sec
, "sec=%s" },
160 { Opt_proto
, "proto=%s" },
161 { Opt_mountproto
, "mountproto=%s" },
162 { Opt_addr
, "addr=%s" },
163 { Opt_clientaddr
, "clientaddr=%s" },
164 { Opt_mounthost
, "mounthost=%s" },
165 { Opt_mountaddr
, "mountaddr=%s" },
167 { Opt_lookupcache
, "lookupcache=%s" },
173 Opt_xprt_udp
, Opt_xprt_tcp
, Opt_xprt_rdma
,
178 static const match_table_t nfs_xprt_protocol_tokens
= {
179 { Opt_xprt_udp
, "udp" },
180 { Opt_xprt_tcp
, "tcp" },
181 { Opt_xprt_rdma
, "rdma" },
183 { Opt_xprt_err
, NULL
}
187 Opt_sec_none
, Opt_sec_sys
,
188 Opt_sec_krb5
, Opt_sec_krb5i
, Opt_sec_krb5p
,
189 Opt_sec_lkey
, Opt_sec_lkeyi
, Opt_sec_lkeyp
,
190 Opt_sec_spkm
, Opt_sec_spkmi
, Opt_sec_spkmp
,
195 static const match_table_t nfs_secflavor_tokens
= {
196 { Opt_sec_none
, "none" },
197 { Opt_sec_none
, "null" },
198 { Opt_sec_sys
, "sys" },
200 { Opt_sec_krb5
, "krb5" },
201 { Opt_sec_krb5i
, "krb5i" },
202 { Opt_sec_krb5p
, "krb5p" },
204 { Opt_sec_lkey
, "lkey" },
205 { Opt_sec_lkeyi
, "lkeyi" },
206 { Opt_sec_lkeyp
, "lkeyp" },
208 { Opt_sec_spkm
, "spkm3" },
209 { Opt_sec_spkmi
, "spkm3i" },
210 { Opt_sec_spkmp
, "spkm3p" },
212 { Opt_sec_err
, NULL
}
216 Opt_lookupcache_all
, Opt_lookupcache_positive
,
217 Opt_lookupcache_none
,
222 static match_table_t nfs_lookupcache_tokens
= {
223 { Opt_lookupcache_all
, "all" },
224 { Opt_lookupcache_positive
, "pos" },
225 { Opt_lookupcache_positive
, "positive" },
226 { Opt_lookupcache_none
, "none" },
228 { Opt_lookupcache_err
, NULL
}
232 static void nfs_umount_begin(struct super_block
*);
233 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
234 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
235 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
236 static int nfs_get_sb(struct file_system_type
*, int, const char *, void *, struct vfsmount
*);
237 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
,
238 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
239 static void nfs_kill_super(struct super_block
*);
240 static int nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
);
242 static struct file_system_type nfs_fs_type
= {
243 .owner
= THIS_MODULE
,
245 .get_sb
= nfs_get_sb
,
246 .kill_sb
= nfs_kill_super
,
247 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
250 struct file_system_type nfs_xdev_fs_type
= {
251 .owner
= THIS_MODULE
,
253 .get_sb
= nfs_xdev_get_sb
,
254 .kill_sb
= nfs_kill_super
,
255 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
258 static const struct super_operations nfs_sops
= {
259 .alloc_inode
= nfs_alloc_inode
,
260 .destroy_inode
= nfs_destroy_inode
,
261 .write_inode
= nfs_write_inode
,
262 .statfs
= nfs_statfs
,
263 .clear_inode
= nfs_clear_inode
,
264 .umount_begin
= nfs_umount_begin
,
265 .show_options
= nfs_show_options
,
266 .show_stats
= nfs_show_stats
,
267 .remount_fs
= nfs_remount
,
271 static int nfs4_get_sb(struct file_system_type
*fs_type
,
272 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
273 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
,
274 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
275 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
,
276 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
277 static void nfs4_kill_super(struct super_block
*sb
);
279 static struct file_system_type nfs4_fs_type
= {
280 .owner
= THIS_MODULE
,
282 .get_sb
= nfs4_get_sb
,
283 .kill_sb
= nfs4_kill_super
,
284 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
287 struct file_system_type nfs4_xdev_fs_type
= {
288 .owner
= THIS_MODULE
,
290 .get_sb
= nfs4_xdev_get_sb
,
291 .kill_sb
= nfs4_kill_super
,
292 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
295 struct file_system_type nfs4_referral_fs_type
= {
296 .owner
= THIS_MODULE
,
298 .get_sb
= nfs4_referral_get_sb
,
299 .kill_sb
= nfs4_kill_super
,
300 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
303 static const struct super_operations nfs4_sops
= {
304 .alloc_inode
= nfs_alloc_inode
,
305 .destroy_inode
= nfs_destroy_inode
,
306 .write_inode
= nfs_write_inode
,
307 .statfs
= nfs_statfs
,
308 .clear_inode
= nfs4_clear_inode
,
309 .umount_begin
= nfs_umount_begin
,
310 .show_options
= nfs_show_options
,
311 .show_stats
= nfs_show_stats
,
312 .remount_fs
= nfs_remount
,
316 static struct shrinker acl_shrinker
= {
317 .shrink
= nfs_access_cache_shrinker
,
318 .seeks
= DEFAULT_SEEKS
,
322 * Register the NFS filesystems
324 int __init
register_nfs_fs(void)
328 ret
= register_filesystem(&nfs_fs_type
);
332 ret
= nfs_register_sysctl();
336 ret
= register_filesystem(&nfs4_fs_type
);
340 register_shrinker(&acl_shrinker
);
345 nfs_unregister_sysctl();
348 unregister_filesystem(&nfs_fs_type
);
354 * Unregister the NFS filesystems
356 void __exit
unregister_nfs_fs(void)
358 unregister_shrinker(&acl_shrinker
);
360 unregister_filesystem(&nfs4_fs_type
);
362 nfs_unregister_sysctl();
363 unregister_filesystem(&nfs_fs_type
);
366 void nfs_sb_active(struct super_block
*sb
)
368 struct nfs_server
*server
= NFS_SB(sb
);
370 if (atomic_inc_return(&server
->active
) == 1)
371 atomic_inc(&sb
->s_active
);
374 void nfs_sb_deactive(struct super_block
*sb
)
376 struct nfs_server
*server
= NFS_SB(sb
);
378 if (atomic_dec_and_test(&server
->active
))
379 deactivate_super(sb
);
383 * Deliver file system statistics to userspace
385 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
387 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
388 unsigned char blockbits
;
389 unsigned long blockres
;
390 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
391 struct nfs_fattr fattr
;
392 struct nfs_fsstat res
= {
397 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
400 buf
->f_type
= NFS_SUPER_MAGIC
;
403 * Current versions of glibc do not correctly handle the
404 * case where f_frsize != f_bsize. Eventually we want to
405 * report the value of wtmult in this field.
407 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
410 * On most *nix systems, f_blocks, f_bfree, and f_bavail
411 * are reported in units of f_frsize. Linux hasn't had
412 * an f_frsize field in its statfs struct until recently,
413 * thus historically Linux's sys_statfs reports these
414 * fields in units of f_bsize.
416 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
417 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
418 blockres
= (1 << blockbits
) - 1;
419 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
420 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
421 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
423 buf
->f_files
= res
.tfiles
;
424 buf
->f_ffree
= res
.afiles
;
426 buf
->f_namelen
= server
->namelen
;
431 dprintk("%s: statfs error = %d\n", __func__
, -error
);
436 * Map the security flavour number to a name
438 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
440 static const struct {
441 rpc_authflavor_t flavour
;
444 { RPC_AUTH_NULL
, "null" },
445 { RPC_AUTH_UNIX
, "sys" },
446 { RPC_AUTH_GSS_KRB5
, "krb5" },
447 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
448 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
449 { RPC_AUTH_GSS_LKEY
, "lkey" },
450 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
451 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
452 { RPC_AUTH_GSS_SPKM
, "spkm" },
453 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
454 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
455 { UINT_MAX
, "unknown" }
459 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
460 if (sec_flavours
[i
].flavour
== flavour
)
463 return sec_flavours
[i
].str
;
466 static void nfs_show_mountd_options(struct seq_file
*m
, struct nfs_server
*nfss
,
469 struct sockaddr
*sap
= (struct sockaddr
*)&nfss
->mountd_address
;
471 switch (sap
->sa_family
) {
473 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
474 seq_printf(m
, ",mountaddr=%pI4", &sin
->sin_addr
.s_addr
);
478 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
479 seq_printf(m
, ",mountaddr=%pI6", &sin6
->sin6_addr
);
484 seq_printf(m
, ",mountaddr=unspecified");
487 if (nfss
->mountd_version
|| showdefaults
)
488 seq_printf(m
, ",mountvers=%u", nfss
->mountd_version
);
489 if (nfss
->mountd_port
|| showdefaults
)
490 seq_printf(m
, ",mountport=%u", nfss
->mountd_port
);
492 switch (nfss
->mountd_protocol
) {
494 seq_printf(m
, ",mountproto=udp");
497 seq_printf(m
, ",mountproto=tcp");
501 seq_printf(m
, ",mountproto=auto");
506 * Describe the mount options in force on this server representation
508 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
,
511 static const struct proc_nfs_info
{
516 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
517 { NFS_MOUNT_INTR
, ",intr", ",nointr" },
518 { NFS_MOUNT_POSIX
, ",posix", "" },
519 { NFS_MOUNT_NOCTO
, ",nocto", "" },
520 { NFS_MOUNT_NOAC
, ",noac", "" },
521 { NFS_MOUNT_NONLM
, ",nolock", "" },
522 { NFS_MOUNT_NOACL
, ",noacl", "" },
523 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
524 { NFS_MOUNT_UNSHARED
, ",nosharecache", "" },
525 { NFS_MOUNT_NORESVPORT
, ",noresvport", "" },
528 const struct proc_nfs_info
*nfs_infop
;
529 struct nfs_client
*clp
= nfss
->nfs_client
;
530 u32 version
= clp
->rpc_ops
->version
;
532 seq_printf(m
, ",vers=%u", version
);
533 seq_printf(m
, ",rsize=%u", nfss
->rsize
);
534 seq_printf(m
, ",wsize=%u", nfss
->wsize
);
535 if (nfss
->bsize
!= 0)
536 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
537 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
538 if (nfss
->acregmin
!= NFS_DEF_ACREGMIN
*HZ
|| showdefaults
)
539 seq_printf(m
, ",acregmin=%u", nfss
->acregmin
/HZ
);
540 if (nfss
->acregmax
!= NFS_DEF_ACREGMAX
*HZ
|| showdefaults
)
541 seq_printf(m
, ",acregmax=%u", nfss
->acregmax
/HZ
);
542 if (nfss
->acdirmin
!= NFS_DEF_ACDIRMIN
*HZ
|| showdefaults
)
543 seq_printf(m
, ",acdirmin=%u", nfss
->acdirmin
/HZ
);
544 if (nfss
->acdirmax
!= NFS_DEF_ACDIRMAX
*HZ
|| showdefaults
)
545 seq_printf(m
, ",acdirmax=%u", nfss
->acdirmax
/HZ
);
546 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
547 if (nfss
->flags
& nfs_infop
->flag
)
548 seq_puts(m
, nfs_infop
->str
);
550 seq_puts(m
, nfs_infop
->nostr
);
552 seq_printf(m
, ",proto=%s",
553 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_PROTO
));
555 if (nfss
->port
!= NFS_PORT
)
556 seq_printf(m
, ",port=%u", nfss
->port
);
559 seq_printf(m
, ",port=%u", nfss
->port
);
561 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
562 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
563 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
566 nfs_show_mountd_options(m
, nfss
, showdefaults
);
569 if (clp
->rpc_ops
->version
== 4)
570 seq_printf(m
, ",clientaddr=%s", clp
->cl_ipaddr
);
572 if (nfss
->options
& NFS_OPTION_FSCACHE
)
573 seq_printf(m
, ",fsc");
577 * Describe the mount options on this VFS mountpoint
579 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
581 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
583 nfs_show_mount_options(m
, nfss
, 0);
585 seq_printf(m
, ",addr=%s",
586 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
593 * Present statistical information for this VFS mountpoint
595 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
598 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
599 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
600 struct nfs_iostats totals
= { };
602 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
605 * Display all mount option settings
607 seq_printf(m
, "\n\topts:\t");
608 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
609 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
610 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
611 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
612 nfs_show_mount_options(m
, nfss
, 1);
614 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
616 seq_printf(m
, "\n\tcaps:\t");
617 seq_printf(m
, "caps=0x%x", nfss
->caps
);
618 seq_printf(m
, ",wtmult=%u", nfss
->wtmult
);
619 seq_printf(m
, ",dtsize=%u", nfss
->dtsize
);
620 seq_printf(m
, ",bsize=%u", nfss
->bsize
);
621 seq_printf(m
, ",namlen=%u", nfss
->namelen
);
624 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
625 seq_printf(m
, "\n\tnfsv4:\t");
626 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
627 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
628 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
633 * Display security flavor in effect for this mount
635 seq_printf(m
, "\n\tsec:\tflavor=%u", auth
->au_ops
->au_flavor
);
637 seq_printf(m
, ",pseudoflavor=%u", auth
->au_flavor
);
640 * Display superblock I/O counters
642 for_each_possible_cpu(cpu
) {
643 struct nfs_iostats
*stats
;
646 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
648 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
649 totals
.events
[i
] += stats
->events
[i
];
650 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
651 totals
.bytes
[i
] += stats
->bytes
[i
];
652 #ifdef CONFIG_NFS_FSCACHE
653 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
654 totals
.fscache
[i
] += stats
->fscache
[i
];
660 seq_printf(m
, "\n\tevents:\t");
661 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
662 seq_printf(m
, "%lu ", totals
.events
[i
]);
663 seq_printf(m
, "\n\tbytes:\t");
664 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
665 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
666 #ifdef CONFIG_NFS_FSCACHE
667 if (nfss
->options
& NFS_OPTION_FSCACHE
) {
668 seq_printf(m
, "\n\tfsc:\t");
669 for (i
= 0; i
< __NFSIOS_FSCACHEMAX
; i
++)
670 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
675 rpc_print_iostats(m
, nfss
->client
);
681 * Begin unmount by attempting to remove all automounted mountpoints we added
682 * in response to xdev traversals and referrals
684 static void nfs_umount_begin(struct super_block
*sb
)
686 struct nfs_server
*server
= NFS_SB(sb
);
687 struct rpc_clnt
*rpc
;
689 /* -EIO all pending I/O */
690 rpc
= server
->client_acl
;
692 rpc_killall_tasks(rpc
);
693 rpc
= server
->client
;
695 rpc_killall_tasks(rpc
);
699 * Sanity-check a server address provided by the mount command.
701 * Address family must be initialized, and address must not be
702 * the ANY address for that family.
704 static int nfs_verify_server_address(struct sockaddr
*addr
)
706 switch (addr
->sa_family
) {
708 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
709 return sa
->sin_addr
.s_addr
!= htonl(INADDR_ANY
);
712 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
713 return !ipv6_addr_any(sa
);
720 static void nfs_parse_ipv4_address(char *string
, size_t str_len
,
721 struct sockaddr
*sap
, size_t *addr_len
)
723 struct sockaddr_in
*sin
= (struct sockaddr_in
*)sap
;
724 u8
*addr
= (u8
*)&sin
->sin_addr
.s_addr
;
726 if (str_len
<= INET_ADDRSTRLEN
) {
727 dfprintk(MOUNT
, "NFS: parsing IPv4 address %*s\n",
728 (int)str_len
, string
);
730 sin
->sin_family
= AF_INET
;
731 *addr_len
= sizeof(*sin
);
732 if (in4_pton(string
, str_len
, addr
, '\0', NULL
))
736 sap
->sa_family
= AF_UNSPEC
;
740 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
741 static int nfs_parse_ipv6_scope_id(const char *string
, const size_t str_len
,
743 struct sockaddr_in6
*sin6
)
748 if ((string
+ str_len
) == delim
)
751 if (*delim
!= IPV6_SCOPE_DELIMITER
)
754 if (!(ipv6_addr_type(&sin6
->sin6_addr
) & IPV6_ADDR_LINKLOCAL
))
757 len
= (string
+ str_len
) - delim
- 1;
758 p
= kstrndup(delim
+ 1, len
, GFP_KERNEL
);
760 unsigned long scope_id
= 0;
761 struct net_device
*dev
;
763 dev
= dev_get_by_name(&init_net
, p
);
765 scope_id
= dev
->ifindex
;
768 if (strict_strtoul(p
, 10, &scope_id
) == 0) {
776 sin6
->sin6_scope_id
= scope_id
;
777 dfprintk(MOUNT
, "NFS: IPv6 scope ID = %lu\n", scope_id
);
784 static void nfs_parse_ipv6_address(char *string
, size_t str_len
,
785 struct sockaddr
*sap
, size_t *addr_len
)
787 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)sap
;
788 u8
*addr
= (u8
*)&sin6
->sin6_addr
.in6_u
;
791 if (str_len
<= INET6_ADDRSTRLEN
) {
792 dfprintk(MOUNT
, "NFS: parsing IPv6 address %*s\n",
793 (int)str_len
, string
);
795 sin6
->sin6_family
= AF_INET6
;
796 *addr_len
= sizeof(*sin6
);
797 if (in6_pton(string
, str_len
, addr
,
798 IPV6_SCOPE_DELIMITER
, &delim
) != 0) {
799 if (nfs_parse_ipv6_scope_id(string
, str_len
,
805 sap
->sa_family
= AF_UNSPEC
;
809 static void nfs_parse_ipv6_address(char *string
, size_t str_len
,
810 struct sockaddr
*sap
, size_t *addr_len
)
812 sap
->sa_family
= AF_UNSPEC
;
818 * Construct a sockaddr based on the contents of a string that contains
819 * an IP address in presentation format.
821 * If there is a problem constructing the new sockaddr, set the address
822 * family to AF_UNSPEC.
824 void nfs_parse_ip_address(char *string
, size_t str_len
,
825 struct sockaddr
*sap
, size_t *addr_len
)
827 unsigned int i
, colons
;
830 for (i
= 0; i
< str_len
; i
++)
831 if (string
[i
] == ':')
835 nfs_parse_ipv6_address(string
, str_len
, sap
, addr_len
);
837 nfs_parse_ipv4_address(string
, str_len
, sap
, addr_len
);
841 * Sanity check the NFS transport protocol.
844 static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
846 switch (mnt
->nfs_server
.protocol
) {
847 case XPRT_TRANSPORT_UDP
:
848 case XPRT_TRANSPORT_TCP
:
849 case XPRT_TRANSPORT_RDMA
:
852 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
857 * For text based NFSv2/v3 mounts, the mount protocol transport default
858 * settings should depend upon the specified NFS transport.
860 static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data
*mnt
)
862 nfs_validate_transport_protocol(mnt
);
864 if (mnt
->mount_server
.protocol
== XPRT_TRANSPORT_UDP
||
865 mnt
->mount_server
.protocol
== XPRT_TRANSPORT_TCP
)
867 switch (mnt
->nfs_server
.protocol
) {
868 case XPRT_TRANSPORT_UDP
:
869 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
871 case XPRT_TRANSPORT_TCP
:
872 case XPRT_TRANSPORT_RDMA
:
873 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
878 * Parse the value of the 'sec=' option.
880 * The flavor_len setting is for v4 mounts.
882 static int nfs_parse_security_flavors(char *value
,
883 struct nfs_parsed_mount_data
*mnt
)
885 substring_t args
[MAX_OPT_ARGS
];
887 dfprintk(MOUNT
, "NFS: parsing sec=%s option\n", value
);
889 switch (match_token(value
, nfs_secflavor_tokens
, args
)) {
891 mnt
->auth_flavor_len
= 0;
892 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
895 mnt
->auth_flavor_len
= 0;
896 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
899 mnt
->auth_flavor_len
= 1;
900 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
903 mnt
->auth_flavor_len
= 1;
904 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
907 mnt
->auth_flavor_len
= 1;
908 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
911 mnt
->auth_flavor_len
= 1;
912 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
915 mnt
->auth_flavor_len
= 1;
916 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
919 mnt
->auth_flavor_len
= 1;
920 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
923 mnt
->auth_flavor_len
= 1;
924 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
927 mnt
->auth_flavor_len
= 1;
928 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
931 mnt
->auth_flavor_len
= 1;
932 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
941 static void nfs_parse_invalid_value(const char *option
)
943 dfprintk(MOUNT
, "NFS: bad value specified for %s option\n", option
);
947 * Error-check and convert a string of mount options from user space into
948 * a data structure. The whole mount string is processed; bad options are
949 * skipped as they are encountered. If there were no errors, return 1;
950 * otherwise return 0 (zero).
952 static int nfs_parse_mount_options(char *raw
,
953 struct nfs_parsed_mount_data
*mnt
)
955 char *p
, *string
, *secdata
;
956 int rc
, sloppy
= 0, errors
= 0;
959 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
962 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
964 secdata
= alloc_secdata();
968 rc
= security_sb_copy_data(raw
, secdata
);
970 goto out_security_failure
;
972 rc
= security_sb_parse_opts_str(secdata
, &mnt
->lsm_opts
);
974 goto out_security_failure
;
976 free_secdata(secdata
);
978 while ((p
= strsep(&raw
, ",")) != NULL
) {
979 substring_t args
[MAX_OPT_ARGS
];
985 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
987 token
= match_token(p
, nfs_mount_option_tokens
, args
);
991 * boolean options: foo/nofoo
994 mnt
->flags
|= NFS_MOUNT_SOFT
;
997 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
1000 mnt
->flags
|= NFS_MOUNT_POSIX
;
1003 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
1006 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
1009 mnt
->flags
|= NFS_MOUNT_NOCTO
;
1012 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
1015 mnt
->flags
|= NFS_MOUNT_NOAC
;
1018 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
1021 mnt
->flags
|= NFS_MOUNT_NONLM
;
1024 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1027 mnt
->flags
|= NFS_MOUNT_VER3
;
1030 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1031 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1034 mnt
->flags
|= NFS_MOUNT_TCP
;
1035 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1038 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
1039 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1040 xprt_load_transport(p
);
1043 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
1046 mnt
->flags
|= NFS_MOUNT_NOACL
;
1049 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
1051 case Opt_nordirplus
:
1052 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
1054 case Opt_sharecache
:
1055 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
1057 case Opt_nosharecache
:
1058 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
1061 mnt
->flags
&= ~NFS_MOUNT_NORESVPORT
;
1063 case Opt_noresvport
:
1064 mnt
->flags
|= NFS_MOUNT_NORESVPORT
;
1067 mnt
->options
|= NFS_OPTION_FSCACHE
;
1068 kfree(mnt
->fscache_uniq
);
1069 mnt
->fscache_uniq
= NULL
;
1072 mnt
->options
&= ~NFS_OPTION_FSCACHE
;
1073 kfree(mnt
->fscache_uniq
);
1074 mnt
->fscache_uniq
= NULL
;
1076 case Opt_fscache_uniq
:
1077 string
= match_strdup(args
);
1080 kfree(mnt
->fscache_uniq
);
1081 mnt
->fscache_uniq
= string
;
1082 mnt
->options
|= NFS_OPTION_FSCACHE
;
1086 * options that take numeric values
1089 if (match_int(args
, &option
) ||
1090 option
< 0 || option
> USHORT_MAX
) {
1092 nfs_parse_invalid_value("port");
1094 mnt
->nfs_server
.port
= option
;
1097 if (match_int(args
, &option
) || option
< 0) {
1099 nfs_parse_invalid_value("rsize");
1101 mnt
->rsize
= option
;
1104 if (match_int(args
, &option
) || option
< 0) {
1106 nfs_parse_invalid_value("wsize");
1108 mnt
->wsize
= option
;
1111 if (match_int(args
, &option
) || option
< 0) {
1113 nfs_parse_invalid_value("bsize");
1115 mnt
->bsize
= option
;
1118 if (match_int(args
, &option
) || option
<= 0) {
1120 nfs_parse_invalid_value("timeo");
1122 mnt
->timeo
= option
;
1125 if (match_int(args
, &option
) || option
<= 0) {
1127 nfs_parse_invalid_value("retrans");
1129 mnt
->retrans
= option
;
1132 if (match_int(args
, &option
) || option
< 0) {
1134 nfs_parse_invalid_value("acregmin");
1136 mnt
->acregmin
= option
;
1139 if (match_int(args
, &option
) || option
< 0) {
1141 nfs_parse_invalid_value("acregmax");
1143 mnt
->acregmax
= option
;
1146 if (match_int(args
, &option
) || option
< 0) {
1148 nfs_parse_invalid_value("acdirmin");
1150 mnt
->acdirmin
= option
;
1153 if (match_int(args
, &option
) || option
< 0) {
1155 nfs_parse_invalid_value("acdirmax");
1157 mnt
->acdirmax
= option
;
1160 if (match_int(args
, &option
) || option
< 0) {
1162 nfs_parse_invalid_value("actimeo");
1164 mnt
->acregmin
= mnt
->acregmax
=
1165 mnt
->acdirmin
= mnt
->acdirmax
= option
;
1168 if (match_int(args
, &option
) || option
< 0) {
1170 nfs_parse_invalid_value("namlen");
1172 mnt
->namlen
= option
;
1175 if (match_int(args
, &option
) ||
1176 option
< 0 || option
> USHORT_MAX
) {
1178 nfs_parse_invalid_value("mountport");
1180 mnt
->mount_server
.port
= option
;
1183 if (match_int(args
, &option
) ||
1184 option
< NFS_MNT_VERSION
||
1185 option
> NFS_MNT3_VERSION
) {
1187 nfs_parse_invalid_value("mountvers");
1189 mnt
->mount_server
.version
= option
;
1192 if (match_int(args
, &option
)) {
1194 nfs_parse_invalid_value("nfsvers");
1199 mnt
->flags
&= ~NFS_MOUNT_VER3
;
1202 mnt
->flags
|= NFS_MOUNT_VER3
;
1206 nfs_parse_invalid_value("nfsvers");
1211 * options that take text values
1214 string
= match_strdup(args
);
1217 rc
= nfs_parse_security_flavors(string
, mnt
);
1221 dfprintk(MOUNT
, "NFS: unrecognized "
1222 "security flavor\n");
1226 string
= match_strdup(args
);
1229 token
= match_token(string
,
1230 nfs_xprt_protocol_tokens
, args
);
1234 mnt
->flags
&= ~NFS_MOUNT_TCP
;
1235 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1238 mnt
->flags
|= NFS_MOUNT_TCP
;
1239 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1242 /* vector side protocols to TCP */
1243 mnt
->flags
|= NFS_MOUNT_TCP
;
1244 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
1245 xprt_load_transport(string
);
1249 dfprintk(MOUNT
, "NFS: unrecognized "
1250 "transport protocol\n");
1254 case Opt_mountproto
:
1255 string
= match_strdup(args
);
1258 token
= match_token(string
,
1259 nfs_xprt_protocol_tokens
, args
);
1264 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1267 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
1269 case Opt_xprt_rdma
: /* not used for side protocols */
1272 dfprintk(MOUNT
, "NFS: unrecognized "
1273 "transport protocol\n");
1277 string
= match_strdup(args
);
1280 nfs_parse_ip_address(string
, strlen(string
),
1282 &mnt
->nfs_server
.address
,
1283 &mnt
->nfs_server
.addrlen
);
1286 case Opt_clientaddr
:
1287 string
= match_strdup(args
);
1290 kfree(mnt
->client_address
);
1291 mnt
->client_address
= string
;
1294 string
= match_strdup(args
);
1297 kfree(mnt
->mount_server
.hostname
);
1298 mnt
->mount_server
.hostname
= string
;
1301 string
= match_strdup(args
);
1304 nfs_parse_ip_address(string
, strlen(string
),
1306 &mnt
->mount_server
.address
,
1307 &mnt
->mount_server
.addrlen
);
1310 case Opt_lookupcache
:
1311 string
= match_strdup(args
);
1314 token
= match_token(string
,
1315 nfs_lookupcache_tokens
, args
);
1318 case Opt_lookupcache_all
:
1319 mnt
->flags
&= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
);
1321 case Opt_lookupcache_positive
:
1322 mnt
->flags
&= ~NFS_MOUNT_LOOKUP_CACHE_NONE
;
1323 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
;
1325 case Opt_lookupcache_none
:
1326 mnt
->flags
|= NFS_MOUNT_LOOKUP_CACHE_NONEG
|NFS_MOUNT_LOOKUP_CACHE_NONE
;
1330 dfprintk(MOUNT
, "NFS: invalid "
1331 "lookupcache argument\n");
1340 dfprintk(MOUNT
, "NFS: relaxing parsing rules\n");
1343 case Opt_deprecated
:
1344 dfprintk(MOUNT
, "NFS: ignoring mount option "
1350 dfprintk(MOUNT
, "NFS: unrecognized mount option "
1356 dfprintk(MOUNT
, "NFS: parsing encountered %d error%s\n",
1357 errors
, (errors
== 1 ? "" : "s"));
1364 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1366 out_security_failure
:
1367 free_secdata(secdata
);
1368 printk(KERN_INFO
"NFS: security options invalid: %d\n", rc
);
1373 * Use the remote server's MOUNT service to request the NFS file handle
1374 * corresponding to the provided path.
1376 static int nfs_try_mount(struct nfs_parsed_mount_data
*args
,
1377 struct nfs_fh
*root_fh
)
1379 struct nfs_mount_request request
= {
1380 .sap
= (struct sockaddr
*)
1381 &args
->mount_server
.address
,
1382 .dirpath
= args
->nfs_server
.export_path
,
1383 .protocol
= args
->mount_server
.protocol
,
1385 .noresvport
= args
->flags
& NFS_MOUNT_NORESVPORT
,
1389 if (args
->mount_server
.version
== 0) {
1390 if (args
->flags
& NFS_MOUNT_VER3
)
1391 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1393 args
->mount_server
.version
= NFS_MNT_VERSION
;
1395 request
.version
= args
->mount_server
.version
;
1397 if (args
->mount_server
.hostname
)
1398 request
.hostname
= args
->mount_server
.hostname
;
1400 request
.hostname
= args
->nfs_server
.hostname
;
1403 * Construct the mount server's address.
1405 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1406 memcpy(request
.sap
, &args
->nfs_server
.address
,
1407 args
->nfs_server
.addrlen
);
1408 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1410 request
.salen
= args
->mount_server
.addrlen
;
1413 * autobind will be used if mount_server.port == 0
1415 nfs_set_port(request
.sap
, args
->mount_server
.port
);
1418 * Now ask the mount server to map our export path
1421 status
= nfs_mount(&request
);
1425 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d\n",
1426 request
.hostname
, status
);
1430 static int nfs_parse_simple_hostname(const char *dev_name
,
1431 char **hostname
, size_t maxnamlen
,
1432 char **export_path
, size_t maxpathlen
)
1435 char *colon
, *comma
;
1437 colon
= strchr(dev_name
, ':');
1439 goto out_bad_devname
;
1441 len
= colon
- dev_name
;
1442 if (len
> maxnamlen
)
1445 /* N.B. caller will free nfs_server.hostname in all cases */
1446 *hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1450 /* kill possible hostname list: not supported */
1451 comma
= strchr(*hostname
, ',');
1452 if (comma
!= NULL
) {
1453 if (comma
== *hostname
)
1454 goto out_bad_devname
;
1459 len
= strlen(colon
);
1460 if (len
> maxpathlen
)
1462 *export_path
= kstrndup(colon
, len
, GFP_KERNEL
);
1466 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", *export_path
);
1470 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1474 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1478 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1479 return -ENAMETOOLONG
;
1482 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1483 return -ENAMETOOLONG
;
1487 * Hostname has square brackets around it because it contains one or
1488 * more colons. We look for the first closing square bracket, and a
1489 * colon must follow it.
1491 static int nfs_parse_protected_hostname(const char *dev_name
,
1492 char **hostname
, size_t maxnamlen
,
1493 char **export_path
, size_t maxpathlen
)
1498 start
= (char *)(dev_name
+ 1);
1500 end
= strchr(start
, ']');
1502 goto out_bad_devname
;
1503 if (*(end
+ 1) != ':')
1504 goto out_bad_devname
;
1507 if (len
> maxnamlen
)
1510 /* N.B. caller will free nfs_server.hostname in all cases */
1511 *hostname
= kstrndup(start
, len
, GFP_KERNEL
);
1512 if (*hostname
== NULL
)
1517 if (len
> maxpathlen
)
1519 *export_path
= kstrndup(end
, len
, GFP_KERNEL
);
1526 dfprintk(MOUNT
, "NFS: device name not in host:path format\n");
1530 dfprintk(MOUNT
, "NFS: not enough memory to parse device name\n");
1534 dfprintk(MOUNT
, "NFS: server hostname too long\n");
1535 return -ENAMETOOLONG
;
1538 dfprintk(MOUNT
, "NFS: export pathname too long\n");
1539 return -ENAMETOOLONG
;
1543 * Split "dev_name" into "hostname:export_path".
1545 * The leftmost colon demarks the split between the server's hostname
1546 * and the export path. If the hostname starts with a left square
1547 * bracket, then it may contain colons.
1549 * Note: caller frees hostname and export path, even on error.
1551 static int nfs_parse_devname(const char *dev_name
,
1552 char **hostname
, size_t maxnamlen
,
1553 char **export_path
, size_t maxpathlen
)
1555 if (*dev_name
== '[')
1556 return nfs_parse_protected_hostname(dev_name
,
1557 hostname
, maxnamlen
,
1558 export_path
, maxpathlen
);
1560 return nfs_parse_simple_hostname(dev_name
,
1561 hostname
, maxnamlen
,
1562 export_path
, maxpathlen
);
1566 * Validate the NFS2/NFS3 mount data
1567 * - fills in the mount root filehandle
1569 * For option strings, user space handles the following behaviors:
1571 * + DNS: mapping server host name to IP address ("addr=" option)
1573 * + failure mode: how to behave if a mount request can't be handled
1574 * immediately ("fg/bg" option)
1576 * + retry: how often to retry a mount request ("retry=" option)
1578 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1579 * mountproto=tcp after mountproto=udp, and so on
1581 static int nfs_validate_mount_data(void *options
,
1582 struct nfs_parsed_mount_data
*args
,
1583 struct nfs_fh
*mntfh
,
1584 const char *dev_name
)
1586 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1591 args
->flags
= (NFS_MOUNT_VER3
| NFS_MOUNT_TCP
);
1592 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1593 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1594 args
->acregmin
= NFS_DEF_ACREGMIN
;
1595 args
->acregmax
= NFS_DEF_ACREGMAX
;
1596 args
->acdirmin
= NFS_DEF_ACDIRMIN
;
1597 args
->acdirmax
= NFS_DEF_ACDIRMAX
;
1598 args
->mount_server
.port
= 0; /* autobind unless user sets port */
1599 args
->nfs_server
.port
= 0; /* autobind unless user sets port */
1600 args
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1601 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1603 switch (data
->version
) {
1609 if (data
->flags
& NFS_MOUNT_VER3
)
1611 data
->root
.size
= NFS2_FHSIZE
;
1612 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1614 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1617 memset(data
->context
, 0, sizeof(data
->context
));
1619 if (data
->flags
& NFS_MOUNT_VER3
) {
1620 if (data
->root
.size
> NFS3_FHSIZE
|| data
->root
.size
== 0)
1621 goto out_invalid_fh
;
1622 mntfh
->size
= data
->root
.size
;
1624 mntfh
->size
= NFS2_FHSIZE
;
1627 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1628 if (mntfh
->size
< sizeof(mntfh
->data
))
1629 memset(mntfh
->data
+ mntfh
->size
, 0,
1630 sizeof(mntfh
->data
) - mntfh
->size
);
1633 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1636 args
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1637 args
->rsize
= data
->rsize
;
1638 args
->wsize
= data
->wsize
;
1639 args
->timeo
= data
->timeo
;
1640 args
->retrans
= data
->retrans
;
1641 args
->acregmin
= data
->acregmin
;
1642 args
->acregmax
= data
->acregmax
;
1643 args
->acdirmin
= data
->acdirmin
;
1644 args
->acdirmax
= data
->acdirmax
;
1646 memcpy(&args
->nfs_server
.address
, &data
->addr
,
1647 sizeof(data
->addr
));
1648 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1649 if (!nfs_verify_server_address((struct sockaddr
*)
1650 &args
->nfs_server
.address
))
1651 goto out_no_address
;
1653 if (!(data
->flags
& NFS_MOUNT_TCP
))
1654 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1655 /* N.B. caller will free nfs_server.hostname in all cases */
1656 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1657 args
->namlen
= data
->namlen
;
1658 args
->bsize
= data
->bsize
;
1660 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1661 args
->auth_flavors
[0] = data
->pseudoflavor
;
1662 if (!args
->nfs_server
.hostname
)
1666 * The legacy version 6 binary mount data from userspace has a
1667 * field used only to transport selinux information into the
1668 * the kernel. To continue to support that functionality we
1669 * have a touch of selinux knowledge here in the NFS code. The
1670 * userspace code converted context=blah to just blah so we are
1671 * converting back to the full string selinux understands.
1673 if (data
->context
[0]){
1674 #ifdef CONFIG_SECURITY_SELINUX
1676 char *opts_str
= kmalloc(sizeof(data
->context
) + 8, GFP_KERNEL
);
1679 strcpy(opts_str
, "context=");
1680 data
->context
[NFS_MAX_CONTEXT_LEN
] = '\0';
1681 strcat(opts_str
, &data
->context
[0]);
1682 rc
= security_sb_parse_opts_str(opts_str
, &args
->lsm_opts
);
1695 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1698 if (!nfs_verify_server_address((struct sockaddr
*)
1699 &args
->nfs_server
.address
))
1700 goto out_no_address
;
1702 nfs_set_port((struct sockaddr
*)&args
->nfs_server
.address
,
1703 args
->nfs_server
.port
);
1705 nfs_set_mount_transport_protocol(args
);
1707 status
= nfs_parse_devname(dev_name
,
1708 &args
->nfs_server
.hostname
,
1710 &args
->nfs_server
.export_path
,
1713 status
= nfs_try_mount(args
, mntfh
);
1715 kfree(args
->nfs_server
.export_path
);
1716 args
->nfs_server
.export_path
= NULL
;
1725 #ifndef CONFIG_NFS_V3
1726 if (args
->flags
& NFS_MOUNT_VER3
)
1727 goto out_v3_not_compiled
;
1728 #endif /* !CONFIG_NFS_V3 */
1733 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1737 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1742 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1745 #ifndef CONFIG_NFS_V3
1746 out_v3_not_compiled
:
1747 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1748 return -EPROTONOSUPPORT
;
1749 #endif /* !CONFIG_NFS_V3 */
1752 dfprintk(MOUNT
, "NFS: not enough memory to handle mount options\n");
1756 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1760 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1765 nfs_compare_remount_data(struct nfs_server
*nfss
,
1766 struct nfs_parsed_mount_data
*data
)
1768 if (data
->flags
!= nfss
->flags
||
1769 data
->rsize
!= nfss
->rsize
||
1770 data
->wsize
!= nfss
->wsize
||
1771 data
->retrans
!= nfss
->client
->cl_timeout
->to_retries
||
1772 data
->auth_flavors
[0] != nfss
->client
->cl_auth
->au_flavor
||
1773 data
->acregmin
!= nfss
->acregmin
/ HZ
||
1774 data
->acregmax
!= nfss
->acregmax
/ HZ
||
1775 data
->acdirmin
!= nfss
->acdirmin
/ HZ
||
1776 data
->acdirmax
!= nfss
->acdirmax
/ HZ
||
1777 data
->timeo
!= (10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
) ||
1778 data
->nfs_server
.addrlen
!= nfss
->nfs_client
->cl_addrlen
||
1779 memcmp(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
1780 data
->nfs_server
.addrlen
) != 0)
1787 nfs_remount(struct super_block
*sb
, int *flags
, char *raw_data
)
1790 struct nfs_server
*nfss
= sb
->s_fs_info
;
1791 struct nfs_parsed_mount_data
*data
;
1792 struct nfs_mount_data
*options
= (struct nfs_mount_data
*)raw_data
;
1793 struct nfs4_mount_data
*options4
= (struct nfs4_mount_data
*)raw_data
;
1794 u32 nfsvers
= nfss
->nfs_client
->rpc_ops
->version
;
1797 * Userspace mount programs that send binary options generally send
1798 * them populated with default values. We have no way to know which
1799 * ones were explicitly specified. Fall back to legacy behavior and
1800 * just return success.
1802 if ((nfsvers
== 4 && (!options4
|| options4
->version
== 1)) ||
1803 (nfsvers
<= 3 && (!options
|| (options
->version
>= 1 &&
1804 options
->version
<= 6))))
1807 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
1811 /* fill out struct with values from existing mount */
1812 data
->flags
= nfss
->flags
;
1813 data
->rsize
= nfss
->rsize
;
1814 data
->wsize
= nfss
->wsize
;
1815 data
->retrans
= nfss
->client
->cl_timeout
->to_retries
;
1816 data
->auth_flavors
[0] = nfss
->client
->cl_auth
->au_flavor
;
1817 data
->acregmin
= nfss
->acregmin
/ HZ
;
1818 data
->acregmax
= nfss
->acregmax
/ HZ
;
1819 data
->acdirmin
= nfss
->acdirmin
/ HZ
;
1820 data
->acdirmax
= nfss
->acdirmax
/ HZ
;
1821 data
->timeo
= 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
;
1822 data
->nfs_server
.addrlen
= nfss
->nfs_client
->cl_addrlen
;
1823 memcpy(&data
->nfs_server
.address
, &nfss
->nfs_client
->cl_addr
,
1824 data
->nfs_server
.addrlen
);
1826 /* overwrite those values with any that were specified */
1827 error
= nfs_parse_mount_options((char *)options
, data
);
1831 /* compare new mount options with old ones */
1832 error
= nfs_compare_remount_data(nfss
, data
);
1839 * Initialise the common bits of the superblock
1841 static inline void nfs_initialise_sb(struct super_block
*sb
)
1843 struct nfs_server
*server
= NFS_SB(sb
);
1845 sb
->s_magic
= NFS_SUPER_MAGIC
;
1847 /* We probably want something more informative here */
1848 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
1849 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
1851 if (sb
->s_blocksize
== 0)
1852 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
1853 &sb
->s_blocksize_bits
);
1855 if (server
->flags
& NFS_MOUNT_NOAC
)
1856 sb
->s_flags
|= MS_SYNCHRONOUS
;
1858 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
1862 * Finish setting up an NFS2/3 superblock
1864 static void nfs_fill_super(struct super_block
*sb
,
1865 struct nfs_parsed_mount_data
*data
)
1867 struct nfs_server
*server
= NFS_SB(sb
);
1869 sb
->s_blocksize_bits
= 0;
1870 sb
->s_blocksize
= 0;
1872 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
1874 if (server
->flags
& NFS_MOUNT_VER3
) {
1875 /* The VFS shouldn't apply the umask to mode bits. We will do
1876 * so ourselves when necessary.
1878 sb
->s_flags
|= MS_POSIXACL
;
1879 sb
->s_time_gran
= 1;
1882 sb
->s_op
= &nfs_sops
;
1883 nfs_initialise_sb(sb
);
1887 * Finish setting up a cloned NFS2/3 superblock
1889 static void nfs_clone_super(struct super_block
*sb
,
1890 const struct super_block
*old_sb
)
1892 struct nfs_server
*server
= NFS_SB(sb
);
1894 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1895 sb
->s_blocksize
= old_sb
->s_blocksize
;
1896 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1898 if (server
->flags
& NFS_MOUNT_VER3
) {
1899 /* The VFS shouldn't apply the umask to mode bits. We will do
1900 * so ourselves when necessary.
1902 sb
->s_flags
|= MS_POSIXACL
;
1903 sb
->s_time_gran
= 1;
1906 sb
->s_op
= old_sb
->s_op
;
1907 nfs_initialise_sb(sb
);
1910 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
1912 const struct nfs_server
*a
= s
->s_fs_info
;
1913 const struct rpc_clnt
*clnt_a
= a
->client
;
1914 const struct rpc_clnt
*clnt_b
= b
->client
;
1916 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
1918 if (a
->nfs_client
!= b
->nfs_client
)
1920 if (a
->flags
!= b
->flags
)
1922 if (a
->wsize
!= b
->wsize
)
1924 if (a
->rsize
!= b
->rsize
)
1926 if (a
->acregmin
!= b
->acregmin
)
1928 if (a
->acregmax
!= b
->acregmax
)
1930 if (a
->acdirmin
!= b
->acdirmin
)
1932 if (a
->acdirmax
!= b
->acdirmax
)
1934 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
1941 struct nfs_sb_mountdata
{
1942 struct nfs_server
*server
;
1946 static int nfs_set_super(struct super_block
*s
, void *data
)
1948 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1949 struct nfs_server
*server
= sb_mntdata
->server
;
1952 s
->s_flags
= sb_mntdata
->mntflags
;
1953 s
->s_fs_info
= server
;
1954 ret
= set_anon_super(s
, server
);
1956 server
->s_dev
= s
->s_dev
;
1960 static int nfs_compare_super_address(struct nfs_server
*server1
,
1961 struct nfs_server
*server2
)
1963 struct sockaddr
*sap1
, *sap2
;
1965 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
1966 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
1968 if (sap1
->sa_family
!= sap2
->sa_family
)
1971 switch (sap1
->sa_family
) {
1973 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
1974 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
1975 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
1977 if (sin1
->sin_port
!= sin2
->sin_port
)
1982 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
1983 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
1984 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
1986 if (sin1
->sin6_port
!= sin2
->sin6_port
)
1997 static int nfs_compare_super(struct super_block
*sb
, void *data
)
1999 struct nfs_sb_mountdata
*sb_mntdata
= data
;
2000 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
2001 int mntflags
= sb_mntdata
->mntflags
;
2003 if (!nfs_compare_super_address(old
, server
))
2005 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2006 if (old
->flags
& NFS_MOUNT_UNSHARED
)
2008 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
2010 return nfs_compare_mount_options(sb
, server
, mntflags
);
2013 static int nfs_bdi_register(struct nfs_server
*server
)
2015 return bdi_register_dev(&server
->backing_dev_info
, server
->s_dev
);
2018 static int nfs_get_sb(struct file_system_type
*fs_type
,
2019 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
2021 struct nfs_server
*server
= NULL
;
2022 struct super_block
*s
;
2023 struct nfs_parsed_mount_data
*data
;
2024 struct nfs_fh
*mntfh
;
2025 struct dentry
*mntroot
;
2026 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2027 struct nfs_sb_mountdata sb_mntdata
= {
2030 int error
= -ENOMEM
;
2032 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2033 mntfh
= kzalloc(sizeof(*mntfh
), GFP_KERNEL
);
2034 if (data
== NULL
|| mntfh
== NULL
)
2037 security_init_mnt_opts(&data
->lsm_opts
);
2039 /* Validate the mount data */
2040 error
= nfs_validate_mount_data(raw_data
, data
, mntfh
, dev_name
);
2044 /* Get a volume representation */
2045 server
= nfs_create_server(data
, mntfh
);
2046 if (IS_ERR(server
)) {
2047 error
= PTR_ERR(server
);
2050 sb_mntdata
.server
= server
;
2052 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2053 compare_super
= NULL
;
2055 /* Get a superblock - note that we may end up sharing one that already exists */
2056 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2062 if (s
->s_fs_info
!= server
) {
2063 nfs_free_server(server
);
2066 error
= nfs_bdi_register(server
);
2068 goto error_splat_super
;
2072 /* initial superblock/root creation */
2073 nfs_fill_super(s
, data
);
2074 nfs_fscache_get_super_cookie(s
, data
);
2077 mntroot
= nfs_get_root(s
, mntfh
);
2078 if (IS_ERR(mntroot
)) {
2079 error
= PTR_ERR(mntroot
);
2080 goto error_splat_super
;
2083 error
= security_sb_set_mnt_opts(s
, &data
->lsm_opts
);
2085 goto error_splat_root
;
2087 s
->s_flags
|= MS_ACTIVE
;
2089 mnt
->mnt_root
= mntroot
;
2093 kfree(data
->nfs_server
.hostname
);
2094 kfree(data
->mount_server
.hostname
);
2095 kfree(data
->fscache_uniq
);
2096 security_free_mnt_opts(&data
->lsm_opts
);
2103 nfs_free_server(server
);
2109 up_write(&s
->s_umount
);
2110 deactivate_super(s
);
2115 * Destroy an NFS2/3 superblock
2117 static void nfs_kill_super(struct super_block
*s
)
2119 struct nfs_server
*server
= NFS_SB(s
);
2121 bdi_unregister(&server
->backing_dev_info
);
2123 nfs_fscache_release_super_cookie(s
);
2124 nfs_free_server(server
);
2128 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2130 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
2131 const char *dev_name
, void *raw_data
,
2132 struct vfsmount
*mnt
)
2134 struct nfs_clone_mount
*data
= raw_data
;
2135 struct super_block
*s
;
2136 struct nfs_server
*server
;
2137 struct dentry
*mntroot
;
2138 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2139 struct nfs_sb_mountdata sb_mntdata
= {
2144 dprintk("--> nfs_xdev_get_sb()\n");
2146 /* create a new volume representation */
2147 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
2148 if (IS_ERR(server
)) {
2149 error
= PTR_ERR(server
);
2150 goto out_err_noserver
;
2152 sb_mntdata
.server
= server
;
2154 if (server
->flags
& NFS_MOUNT_UNSHARED
)
2155 compare_super
= NULL
;
2157 /* Get a superblock - note that we may end up sharing one that already exists */
2158 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2164 if (s
->s_fs_info
!= server
) {
2165 nfs_free_server(server
);
2168 error
= nfs_bdi_register(server
);
2170 goto error_splat_super
;
2174 /* initial superblock/root creation */
2175 nfs_clone_super(s
, data
->sb
);
2178 mntroot
= nfs_get_root(s
, data
->fh
);
2179 if (IS_ERR(mntroot
)) {
2180 error
= PTR_ERR(mntroot
);
2181 goto error_splat_super
;
2183 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2186 goto error_splat_super
;
2189 s
->s_flags
|= MS_ACTIVE
;
2191 mnt
->mnt_root
= mntroot
;
2193 /* clone any lsm security options from the parent to the new sb */
2194 security_sb_clone_mnt_opts(data
->sb
, s
);
2196 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2200 nfs_free_server(server
);
2202 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error
);
2206 up_write(&s
->s_umount
);
2207 deactivate_super(s
);
2208 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error
);
2212 #ifdef CONFIG_NFS_V4
2215 * Finish setting up a cloned NFS4 superblock
2217 static void nfs4_clone_super(struct super_block
*sb
,
2218 const struct super_block
*old_sb
)
2220 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
2221 sb
->s_blocksize
= old_sb
->s_blocksize
;
2222 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
2223 sb
->s_time_gran
= 1;
2224 sb
->s_op
= old_sb
->s_op
;
2225 nfs_initialise_sb(sb
);
2229 * Set up an NFS4 superblock
2231 static void nfs4_fill_super(struct super_block
*sb
)
2233 sb
->s_time_gran
= 1;
2234 sb
->s_op
= &nfs4_sops
;
2235 nfs_initialise_sb(sb
);
2239 * Validate NFSv4 mount options
2241 static int nfs4_validate_mount_data(void *options
,
2242 struct nfs_parsed_mount_data
*args
,
2243 const char *dev_name
)
2245 struct sockaddr_in
*ap
;
2246 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
2252 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
2253 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
2254 args
->acregmin
= NFS_DEF_ACREGMIN
;
2255 args
->acregmax
= NFS_DEF_ACREGMAX
;
2256 args
->acdirmin
= NFS_DEF_ACDIRMIN
;
2257 args
->acdirmax
= NFS_DEF_ACDIRMAX
;
2258 args
->nfs_server
.port
= NFS_PORT
; /* 2049 unless user set port= */
2259 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
2260 args
->auth_flavor_len
= 0;
2262 switch (data
->version
) {
2264 ap
= (struct sockaddr_in
*)&args
->nfs_server
.address
;
2265 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
2266 goto out_no_address
;
2267 if (data
->host_addrlen
== 0)
2268 goto out_no_address
;
2269 args
->nfs_server
.addrlen
= data
->host_addrlen
;
2270 if (copy_from_user(ap
, data
->host_addr
, data
->host_addrlen
))
2272 if (!nfs_verify_server_address((struct sockaddr
*)
2273 &args
->nfs_server
.address
))
2274 goto out_no_address
;
2276 if (data
->auth_flavourlen
) {
2277 if (data
->auth_flavourlen
> 1)
2278 goto out_inval_auth
;
2279 if (copy_from_user(&args
->auth_flavors
[0],
2280 data
->auth_flavours
,
2281 sizeof(args
->auth_flavors
[0])))
2285 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
2288 args
->nfs_server
.hostname
= c
;
2290 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
2293 args
->nfs_server
.export_path
= c
;
2294 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
2296 c
= strndup_user(data
->client_addr
.data
, 16);
2299 args
->client_address
= c
;
2302 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2306 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
2307 args
->rsize
= data
->rsize
;
2308 args
->wsize
= data
->wsize
;
2309 args
->timeo
= data
->timeo
;
2310 args
->retrans
= data
->retrans
;
2311 args
->acregmin
= data
->acregmin
;
2312 args
->acregmax
= data
->acregmax
;
2313 args
->acdirmin
= data
->acdirmin
;
2314 args
->acdirmax
= data
->acdirmax
;
2315 args
->nfs_server
.protocol
= data
->proto
;
2316 nfs_validate_transport_protocol(args
);
2322 if (nfs_parse_mount_options((char *)options
, args
) == 0)
2325 if (!nfs_verify_server_address((struct sockaddr
*)
2326 &args
->nfs_server
.address
))
2329 nfs_set_port((struct sockaddr
*)&args
->nfs_server
.address
,
2330 args
->nfs_server
.port
);
2332 nfs_validate_transport_protocol(args
);
2334 if (args
->auth_flavor_len
> 1)
2335 goto out_inval_auth
;
2337 if (args
->client_address
== NULL
)
2338 goto out_no_client_address
;
2340 status
= nfs_parse_devname(dev_name
,
2341 &args
->nfs_server
.hostname
,
2343 &args
->nfs_server
.export_path
,
2355 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
2359 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
2360 data
->auth_flavourlen
);
2364 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
2367 out_no_client_address
:
2368 dfprintk(MOUNT
, "NFS4: mount program didn't pass callback address\n");
2373 * Get the superblock for an NFS4 mountpoint
2375 static int nfs4_get_sb(struct file_system_type
*fs_type
,
2376 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
2378 struct nfs_parsed_mount_data
*data
;
2379 struct super_block
*s
;
2380 struct nfs_server
*server
;
2381 struct nfs_fh
*mntfh
;
2382 struct dentry
*mntroot
;
2383 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2384 struct nfs_sb_mountdata sb_mntdata
= {
2387 int error
= -ENOMEM
;
2389 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
2390 mntfh
= kzalloc(sizeof(*mntfh
), GFP_KERNEL
);
2391 if (data
== NULL
|| mntfh
== NULL
)
2394 security_init_mnt_opts(&data
->lsm_opts
);
2396 /* Validate the mount data */
2397 error
= nfs4_validate_mount_data(raw_data
, data
, dev_name
);
2401 /* Get a volume representation */
2402 server
= nfs4_create_server(data
, mntfh
);
2403 if (IS_ERR(server
)) {
2404 error
= PTR_ERR(server
);
2407 sb_mntdata
.server
= server
;
2409 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2410 compare_super
= NULL
;
2412 /* Get a superblock - note that we may end up sharing one that already exists */
2413 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2419 if (s
->s_fs_info
!= server
) {
2420 nfs_free_server(server
);
2423 error
= nfs_bdi_register(server
);
2425 goto error_splat_super
;
2429 /* initial superblock/root creation */
2431 nfs_fscache_get_super_cookie(s
, data
);
2434 mntroot
= nfs4_get_root(s
, mntfh
);
2435 if (IS_ERR(mntroot
)) {
2436 error
= PTR_ERR(mntroot
);
2437 goto error_splat_super
;
2440 error
= security_sb_set_mnt_opts(s
, &data
->lsm_opts
);
2442 goto error_splat_root
;
2444 s
->s_flags
|= MS_ACTIVE
;
2446 mnt
->mnt_root
= mntroot
;
2450 kfree(data
->client_address
);
2451 kfree(data
->nfs_server
.export_path
);
2452 kfree(data
->nfs_server
.hostname
);
2453 kfree(data
->fscache_uniq
);
2454 security_free_mnt_opts(&data
->lsm_opts
);
2461 nfs_free_server(server
);
2467 up_write(&s
->s_umount
);
2468 deactivate_super(s
);
2472 static void nfs4_kill_super(struct super_block
*sb
)
2474 struct nfs_server
*server
= NFS_SB(sb
);
2476 nfs_super_return_all_delegations(sb
);
2477 kill_anon_super(sb
);
2479 nfs4_renewd_prepare_shutdown(server
);
2480 nfs_fscache_release_super_cookie(sb
);
2481 nfs_free_server(server
);
2485 * Clone an NFS4 server record on xdev traversal (FSID-change)
2487 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
2488 const char *dev_name
, void *raw_data
,
2489 struct vfsmount
*mnt
)
2491 struct nfs_clone_mount
*data
= raw_data
;
2492 struct super_block
*s
;
2493 struct nfs_server
*server
;
2494 struct dentry
*mntroot
;
2495 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2496 struct nfs_sb_mountdata sb_mntdata
= {
2501 dprintk("--> nfs4_xdev_get_sb()\n");
2503 /* create a new volume representation */
2504 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
2505 if (IS_ERR(server
)) {
2506 error
= PTR_ERR(server
);
2507 goto out_err_noserver
;
2509 sb_mntdata
.server
= server
;
2511 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2512 compare_super
= NULL
;
2514 /* Get a superblock - note that we may end up sharing one that already exists */
2515 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2521 if (s
->s_fs_info
!= server
) {
2522 nfs_free_server(server
);
2525 error
= nfs_bdi_register(server
);
2527 goto error_splat_super
;
2531 /* initial superblock/root creation */
2532 nfs4_clone_super(s
, data
->sb
);
2535 mntroot
= nfs4_get_root(s
, data
->fh
);
2536 if (IS_ERR(mntroot
)) {
2537 error
= PTR_ERR(mntroot
);
2538 goto error_splat_super
;
2540 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2543 goto error_splat_super
;
2546 s
->s_flags
|= MS_ACTIVE
;
2548 mnt
->mnt_root
= mntroot
;
2550 security_sb_clone_mnt_opts(data
->sb
, s
);
2552 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2556 nfs_free_server(server
);
2558 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error
);
2562 up_write(&s
->s_umount
);
2563 deactivate_super(s
);
2564 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error
);
2569 * Create an NFS4 server record on referral traversal
2571 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
, int flags
,
2572 const char *dev_name
, void *raw_data
,
2573 struct vfsmount
*mnt
)
2575 struct nfs_clone_mount
*data
= raw_data
;
2576 struct super_block
*s
;
2577 struct nfs_server
*server
;
2578 struct dentry
*mntroot
;
2579 struct nfs_fh mntfh
;
2580 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2581 struct nfs_sb_mountdata sb_mntdata
= {
2586 dprintk("--> nfs4_referral_get_sb()\n");
2588 /* create a new volume representation */
2589 server
= nfs4_create_referral_server(data
, &mntfh
);
2590 if (IS_ERR(server
)) {
2591 error
= PTR_ERR(server
);
2592 goto out_err_noserver
;
2594 sb_mntdata
.server
= server
;
2596 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2597 compare_super
= NULL
;
2599 /* Get a superblock - note that we may end up sharing one that already exists */
2600 s
= sget(&nfs4_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2606 if (s
->s_fs_info
!= server
) {
2607 nfs_free_server(server
);
2610 error
= nfs_bdi_register(server
);
2612 goto error_splat_super
;
2616 /* initial superblock/root creation */
2620 mntroot
= nfs4_get_root(s
, &mntfh
);
2621 if (IS_ERR(mntroot
)) {
2622 error
= PTR_ERR(mntroot
);
2623 goto error_splat_super
;
2625 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2628 goto error_splat_super
;
2631 s
->s_flags
|= MS_ACTIVE
;
2633 mnt
->mnt_root
= mntroot
;
2635 security_sb_clone_mnt_opts(data
->sb
, s
);
2637 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2641 nfs_free_server(server
);
2643 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
2647 up_write(&s
->s_umount
);
2648 deactivate_super(s
);
2649 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
2653 #endif /* CONFIG_NFS_V4 */