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_err
, NULL
}
197 static void nfs_umount_begin(struct vfsmount
*, int);
198 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
199 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
200 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
201 static int nfs_get_sb(struct file_system_type
*, int, const char *, void *, struct vfsmount
*);
202 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
,
203 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
204 static void nfs_kill_super(struct super_block
*);
205 static void nfs_put_super(struct super_block
*);
207 static struct file_system_type nfs_fs_type
= {
208 .owner
= THIS_MODULE
,
210 .get_sb
= nfs_get_sb
,
211 .kill_sb
= nfs_kill_super
,
212 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
215 struct file_system_type nfs_xdev_fs_type
= {
216 .owner
= THIS_MODULE
,
218 .get_sb
= nfs_xdev_get_sb
,
219 .kill_sb
= nfs_kill_super
,
220 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
223 static const struct super_operations nfs_sops
= {
224 .alloc_inode
= nfs_alloc_inode
,
225 .destroy_inode
= nfs_destroy_inode
,
226 .write_inode
= nfs_write_inode
,
227 .put_super
= nfs_put_super
,
228 .statfs
= nfs_statfs
,
229 .clear_inode
= nfs_clear_inode
,
230 .umount_begin
= nfs_umount_begin
,
231 .show_options
= nfs_show_options
,
232 .show_stats
= nfs_show_stats
,
236 static int nfs4_get_sb(struct file_system_type
*fs_type
,
237 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
238 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
,
239 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
240 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
,
241 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
242 static void nfs4_kill_super(struct super_block
*sb
);
244 static struct file_system_type nfs4_fs_type
= {
245 .owner
= THIS_MODULE
,
247 .get_sb
= nfs4_get_sb
,
248 .kill_sb
= nfs4_kill_super
,
249 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
252 struct file_system_type nfs4_xdev_fs_type
= {
253 .owner
= THIS_MODULE
,
255 .get_sb
= nfs4_xdev_get_sb
,
256 .kill_sb
= nfs4_kill_super
,
257 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
260 struct file_system_type nfs4_referral_fs_type
= {
261 .owner
= THIS_MODULE
,
263 .get_sb
= nfs4_referral_get_sb
,
264 .kill_sb
= nfs4_kill_super
,
265 .fs_flags
= FS_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
268 static const struct super_operations nfs4_sops
= {
269 .alloc_inode
= nfs_alloc_inode
,
270 .destroy_inode
= nfs_destroy_inode
,
271 .write_inode
= nfs_write_inode
,
272 .statfs
= nfs_statfs
,
273 .clear_inode
= nfs4_clear_inode
,
274 .umount_begin
= nfs_umount_begin
,
275 .show_options
= nfs_show_options
,
276 .show_stats
= nfs_show_stats
,
280 static struct shrinker acl_shrinker
= {
281 .shrink
= nfs_access_cache_shrinker
,
282 .seeks
= DEFAULT_SEEKS
,
286 * Register the NFS filesystems
288 int __init
register_nfs_fs(void)
292 ret
= register_filesystem(&nfs_fs_type
);
296 ret
= nfs_register_sysctl();
300 ret
= register_filesystem(&nfs4_fs_type
);
304 register_shrinker(&acl_shrinker
);
309 nfs_unregister_sysctl();
312 unregister_filesystem(&nfs_fs_type
);
318 * Unregister the NFS filesystems
320 void __exit
unregister_nfs_fs(void)
322 unregister_shrinker(&acl_shrinker
);
324 unregister_filesystem(&nfs4_fs_type
);
326 nfs_unregister_sysctl();
327 unregister_filesystem(&nfs_fs_type
);
330 void nfs_sb_active(struct nfs_server
*server
)
332 atomic_inc(&server
->active
);
335 void nfs_sb_deactive(struct nfs_server
*server
)
337 if (atomic_dec_and_test(&server
->active
))
338 wake_up(&server
->active_wq
);
341 static void nfs_put_super(struct super_block
*sb
)
343 struct nfs_server
*server
= NFS_SB(sb
);
345 * Make sure there are no outstanding ops to this server.
346 * If so, wait for them to finish before allowing the
347 * unmount to continue.
349 wait_event(server
->active_wq
, atomic_read(&server
->active
) == 0);
353 * Deliver file system statistics to userspace
355 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
357 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
358 unsigned char blockbits
;
359 unsigned long blockres
;
360 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
361 struct nfs_fattr fattr
;
362 struct nfs_fsstat res
= {
369 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
372 buf
->f_type
= NFS_SUPER_MAGIC
;
375 * Current versions of glibc do not correctly handle the
376 * case where f_frsize != f_bsize. Eventually we want to
377 * report the value of wtmult in this field.
379 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
382 * On most *nix systems, f_blocks, f_bfree, and f_bavail
383 * are reported in units of f_frsize. Linux hasn't had
384 * an f_frsize field in its statfs struct until recently,
385 * thus historically Linux's sys_statfs reports these
386 * fields in units of f_bsize.
388 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
389 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
390 blockres
= (1 << blockbits
) - 1;
391 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
392 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
393 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
395 buf
->f_files
= res
.tfiles
;
396 buf
->f_ffree
= res
.afiles
;
398 buf
->f_namelen
= server
->namelen
;
404 dprintk("%s: statfs error = %d\n", __FUNCTION__
, -error
);
410 * Map the security flavour number to a name
412 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
414 static const struct {
415 rpc_authflavor_t flavour
;
418 { RPC_AUTH_NULL
, "null" },
419 { RPC_AUTH_UNIX
, "sys" },
420 { RPC_AUTH_GSS_KRB5
, "krb5" },
421 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
422 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
423 { RPC_AUTH_GSS_LKEY
, "lkey" },
424 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
425 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
426 { RPC_AUTH_GSS_SPKM
, "spkm" },
427 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
428 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
429 { UINT_MAX
, "unknown" }
433 for (i
= 0; sec_flavours
[i
].flavour
!= UINT_MAX
; i
++) {
434 if (sec_flavours
[i
].flavour
== flavour
)
437 return sec_flavours
[i
].str
;
441 * Describe the mount options in force on this server representation
443 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
, int showdefaults
)
445 static const struct proc_nfs_info
{
450 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
451 { NFS_MOUNT_NOCTO
, ",nocto", "" },
452 { NFS_MOUNT_NOAC
, ",noac", "" },
453 { NFS_MOUNT_NONLM
, ",nolock", "" },
454 { NFS_MOUNT_NOACL
, ",noacl", "" },
455 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
456 { NFS_MOUNT_UNSHARED
, ",nosharecache", ""},
459 const struct proc_nfs_info
*nfs_infop
;
460 struct nfs_client
*clp
= nfss
->nfs_client
;
462 seq_printf(m
, ",vers=%d", clp
->rpc_ops
->version
);
463 seq_printf(m
, ",rsize=%d", nfss
->rsize
);
464 seq_printf(m
, ",wsize=%d", nfss
->wsize
);
465 if (nfss
->acregmin
!= 3*HZ
|| showdefaults
)
466 seq_printf(m
, ",acregmin=%d", nfss
->acregmin
/HZ
);
467 if (nfss
->acregmax
!= 60*HZ
|| showdefaults
)
468 seq_printf(m
, ",acregmax=%d", nfss
->acregmax
/HZ
);
469 if (nfss
->acdirmin
!= 30*HZ
|| showdefaults
)
470 seq_printf(m
, ",acdirmin=%d", nfss
->acdirmin
/HZ
);
471 if (nfss
->acdirmax
!= 60*HZ
|| showdefaults
)
472 seq_printf(m
, ",acdirmax=%d", nfss
->acdirmax
/HZ
);
473 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
474 if (nfss
->flags
& nfs_infop
->flag
)
475 seq_puts(m
, nfs_infop
->str
);
477 seq_puts(m
, nfs_infop
->nostr
);
479 seq_printf(m
, ",proto=%s",
480 rpc_peeraddr2str(nfss
->client
, RPC_DISPLAY_PROTO
));
481 seq_printf(m
, ",timeo=%lu", 10U * nfss
->client
->cl_timeout
->to_initval
/ HZ
);
482 seq_printf(m
, ",retrans=%u", nfss
->client
->cl_timeout
->to_retries
);
483 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
487 * Describe the mount options on this VFS mountpoint
489 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
491 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
493 nfs_show_mount_options(m
, nfss
, 0);
495 seq_printf(m
, ",addr=%s",
496 rpc_peeraddr2str(nfss
->nfs_client
->cl_rpcclient
,
503 * Present statistical information for this VFS mountpoint
505 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
508 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
509 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
510 struct nfs_iostats totals
= { };
512 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
515 * Display all mount option settings
517 seq_printf(m
, "\n\topts:\t");
518 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
519 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
520 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
521 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
522 nfs_show_mount_options(m
, nfss
, 1);
524 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
526 seq_printf(m
, "\n\tcaps:\t");
527 seq_printf(m
, "caps=0x%x", nfss
->caps
);
528 seq_printf(m
, ",wtmult=%d", nfss
->wtmult
);
529 seq_printf(m
, ",dtsize=%d", nfss
->dtsize
);
530 seq_printf(m
, ",bsize=%d", nfss
->bsize
);
531 seq_printf(m
, ",namelen=%d", nfss
->namelen
);
534 if (nfss
->nfs_client
->rpc_ops
->version
== 4) {
535 seq_printf(m
, "\n\tnfsv4:\t");
536 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
537 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
538 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
543 * Display security flavor in effect for this mount
545 seq_printf(m
, "\n\tsec:\tflavor=%d", auth
->au_ops
->au_flavor
);
547 seq_printf(m
, ",pseudoflavor=%d", auth
->au_flavor
);
550 * Display superblock I/O counters
552 for_each_possible_cpu(cpu
) {
553 struct nfs_iostats
*stats
;
556 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
558 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
559 totals
.events
[i
] += stats
->events
[i
];
560 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
561 totals
.bytes
[i
] += stats
->bytes
[i
];
566 seq_printf(m
, "\n\tevents:\t");
567 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
568 seq_printf(m
, "%lu ", totals
.events
[i
]);
569 seq_printf(m
, "\n\tbytes:\t");
570 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
571 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
574 rpc_print_iostats(m
, nfss
->client
);
580 * Begin unmount by attempting to remove all automounted mountpoints we added
581 * in response to xdev traversals and referrals
583 static void nfs_umount_begin(struct vfsmount
*vfsmnt
, int flags
)
585 struct nfs_server
*server
= NFS_SB(vfsmnt
->mnt_sb
);
586 struct rpc_clnt
*rpc
;
588 shrink_submounts(vfsmnt
, &nfs_automount_list
);
590 if (!(flags
& MNT_FORCE
))
592 /* -EIO all pending I/O */
593 rpc
= server
->client_acl
;
595 rpc_killall_tasks(rpc
);
596 rpc
= server
->client
;
598 rpc_killall_tasks(rpc
);
602 * Set the port number in an address. Be agnostic about the address family.
604 static void nfs_set_port(struct sockaddr
*sap
, unsigned short port
)
606 switch (sap
->sa_family
) {
608 struct sockaddr_in
*ap
= (struct sockaddr_in
*)sap
;
609 ap
->sin_port
= htons(port
);
613 struct sockaddr_in6
*ap
= (struct sockaddr_in6
*)sap
;
614 ap
->sin6_port
= htons(port
);
621 * Sanity-check a server address provided by the mount command.
623 * Address family must be initialized, and address must not be
624 * the ANY address for that family.
626 static int nfs_verify_server_address(struct sockaddr
*addr
)
628 switch (addr
->sa_family
) {
630 struct sockaddr_in
*sa
= (struct sockaddr_in
*)addr
;
631 return sa
->sin_addr
.s_addr
!= INADDR_ANY
;
634 struct in6_addr
*sa
= &((struct sockaddr_in6
*)addr
)->sin6_addr
;
635 return !ipv6_addr_any(sa
);
643 * Parse string addresses passed in via a mount option,
644 * and construct a sockaddr based on the result.
646 * If address parsing fails, set the sockaddr's address
647 * family to AF_UNSPEC to force nfs_verify_server_address()
650 static void nfs_parse_server_address(char *value
,
651 struct sockaddr
*sap
,
654 if (strchr(value
, ':')) {
655 struct sockaddr_in6
*ap
= (struct sockaddr_in6
*)sap
;
656 u8
*addr
= (u8
*)&ap
->sin6_addr
.in6_u
;
658 ap
->sin6_family
= AF_INET6
;
660 if (in6_pton(value
, -1, addr
, '\0', NULL
))
663 struct sockaddr_in
*ap
= (struct sockaddr_in
*)sap
;
664 u8
*addr
= (u8
*)&ap
->sin_addr
.s_addr
;
666 ap
->sin_family
= AF_INET
;
668 if (in4_pton(value
, -1, addr
, '\0', NULL
))
672 sap
->sa_family
= AF_UNSPEC
;
677 * Error-check and convert a string of mount options from user space into
680 static int nfs_parse_mount_options(char *raw
,
681 struct nfs_parsed_mount_data
*mnt
)
684 unsigned short port
= 0;
687 dfprintk(MOUNT
, "NFS: mount options string was NULL.\n");
690 dfprintk(MOUNT
, "NFS: nfs mount opts='%s'\n", raw
);
692 while ((p
= strsep(&raw
, ",")) != NULL
) {
693 substring_t args
[MAX_OPT_ARGS
];
699 dfprintk(MOUNT
, "NFS: parsing nfs mount option '%s'\n", p
);
701 token
= match_token(p
, nfs_mount_option_tokens
, args
);
704 mnt
->flags
|= NFS_MOUNT_SOFT
;
707 mnt
->flags
&= ~NFS_MOUNT_SOFT
;
713 mnt
->flags
|= NFS_MOUNT_POSIX
;
716 mnt
->flags
&= ~NFS_MOUNT_POSIX
;
719 mnt
->flags
&= ~NFS_MOUNT_NOCTO
;
722 mnt
->flags
|= NFS_MOUNT_NOCTO
;
725 mnt
->flags
&= ~NFS_MOUNT_NOAC
;
728 mnt
->flags
|= NFS_MOUNT_NOAC
;
731 mnt
->flags
&= ~NFS_MOUNT_NONLM
;
734 mnt
->flags
|= NFS_MOUNT_NONLM
;
737 mnt
->flags
&= ~NFS_MOUNT_VER3
;
740 mnt
->flags
|= NFS_MOUNT_VER3
;
743 mnt
->flags
&= ~NFS_MOUNT_TCP
;
744 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
749 mnt
->flags
|= NFS_MOUNT_TCP
;
750 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
755 mnt
->flags
|= NFS_MOUNT_TCP
; /* for side protocols */
756 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
761 mnt
->flags
&= ~NFS_MOUNT_NOACL
;
764 mnt
->flags
|= NFS_MOUNT_NOACL
;
767 mnt
->flags
&= ~NFS_MOUNT_NORDIRPLUS
;
770 mnt
->flags
|= NFS_MOUNT_NORDIRPLUS
;
773 mnt
->flags
&= ~NFS_MOUNT_UNSHARED
;
775 case Opt_nosharecache
:
776 mnt
->flags
|= NFS_MOUNT_UNSHARED
;
780 if (match_int(args
, &option
))
782 if (option
< 0 || option
> 65535)
787 if (match_int(args
, &mnt
->rsize
))
791 if (match_int(args
, &mnt
->wsize
))
795 if (match_int(args
, &option
))
802 if (match_int(args
, &mnt
->timeo
))
806 if (match_int(args
, &mnt
->retrans
))
810 if (match_int(args
, &mnt
->acregmin
))
814 if (match_int(args
, &mnt
->acregmax
))
818 if (match_int(args
, &mnt
->acdirmin
))
822 if (match_int(args
, &mnt
->acdirmax
))
826 if (match_int(args
, &option
))
833 mnt
->acdirmax
= option
;
836 if (match_int(args
, &mnt
->namlen
))
840 if (match_int(args
, &option
))
842 if (option
< 0 || option
> 65535)
844 mnt
->mount_server
.port
= option
;
847 if (match_int(args
, &option
))
851 mnt
->mount_server
.version
= option
;
854 if (match_int(args
, &option
))
858 mnt
->flags
&= ~NFS_MOUNT_VER3
;
861 mnt
->flags
|= NFS_MOUNT_VER3
;
869 string
= match_strdup(args
);
872 token
= match_token(string
, nfs_secflavor_tokens
, args
);
876 * The flags setting is for v2/v3. The flavor_len
877 * setting is for v4. v2/v3 also need to know the
878 * difference between NULL and UNIX.
882 mnt
->flags
&= ~NFS_MOUNT_SECFLAVOUR
;
883 mnt
->auth_flavor_len
= 0;
884 mnt
->auth_flavors
[0] = RPC_AUTH_NULL
;
887 mnt
->flags
&= ~NFS_MOUNT_SECFLAVOUR
;
888 mnt
->auth_flavor_len
= 0;
889 mnt
->auth_flavors
[0] = RPC_AUTH_UNIX
;
892 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
893 mnt
->auth_flavor_len
= 1;
894 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5
;
897 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
898 mnt
->auth_flavor_len
= 1;
899 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5I
;
902 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
903 mnt
->auth_flavor_len
= 1;
904 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_KRB5P
;
907 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
908 mnt
->auth_flavor_len
= 1;
909 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEY
;
912 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
913 mnt
->auth_flavor_len
= 1;
914 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYI
;
917 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
918 mnt
->auth_flavor_len
= 1;
919 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_LKEYP
;
922 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
923 mnt
->auth_flavor_len
= 1;
924 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKM
;
927 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
928 mnt
->auth_flavor_len
= 1;
929 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMI
;
932 mnt
->flags
|= NFS_MOUNT_SECFLAVOUR
;
933 mnt
->auth_flavor_len
= 1;
934 mnt
->auth_flavors
[0] = RPC_AUTH_GSS_SPKMP
;
941 string
= match_strdup(args
);
944 token
= match_token(string
,
945 nfs_xprt_protocol_tokens
, args
);
950 mnt
->flags
&= ~NFS_MOUNT_TCP
;
951 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
956 mnt
->flags
|= NFS_MOUNT_TCP
;
957 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
962 /* vector side protocols to TCP */
963 mnt
->flags
|= NFS_MOUNT_TCP
;
964 mnt
->nfs_server
.protocol
= XPRT_TRANSPORT_RDMA
;
973 string
= match_strdup(args
);
976 token
= match_token(string
,
977 nfs_xprt_protocol_tokens
, args
);
982 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
985 mnt
->mount_server
.protocol
= XPRT_TRANSPORT_TCP
;
987 case Opt_xprt_rdma
: /* not used for side protocols */
993 string
= match_strdup(args
);
996 nfs_parse_server_address(string
, (struct sockaddr
*)
997 &mnt
->nfs_server
.address
,
998 &mnt
->nfs_server
.addrlen
);
1001 case Opt_clientaddr
:
1002 string
= match_strdup(args
);
1005 kfree(mnt
->client_address
);
1006 mnt
->client_address
= string
;
1009 string
= match_strdup(args
);
1012 kfree(mnt
->mount_server
.hostname
);
1013 mnt
->mount_server
.hostname
= string
;
1016 string
= match_strdup(args
);
1019 nfs_parse_server_address(string
, (struct sockaddr
*)
1020 &mnt
->mount_server
.address
,
1021 &mnt
->mount_server
.addrlen
);
1026 case Opt_deprecated
:
1034 nfs_set_port((struct sockaddr
*)&mnt
->nfs_server
.address
, port
);
1039 printk(KERN_INFO
"NFS: not enough memory to parse option\n");
1043 printk(KERN_INFO
"NFS: unrecognized NFS version number\n");
1047 printk(KERN_INFO
"NFS: unrecognized transport protocol\n");
1051 printk(KERN_INFO
"NFS: unrecognized security flavor\n");
1055 printk(KERN_INFO
"NFS: unknown mount option: %s\n", p
);
1060 * Use the remote server's MOUNT service to request the NFS file handle
1061 * corresponding to the provided path.
1063 static int nfs_try_mount(struct nfs_parsed_mount_data
*args
,
1064 struct nfs_fh
*root_fh
)
1066 struct sockaddr
*sap
= (struct sockaddr
*)&args
->mount_server
.address
;
1070 if (args
->mount_server
.version
== 0) {
1071 if (args
->flags
& NFS_MOUNT_VER3
)
1072 args
->mount_server
.version
= NFS_MNT3_VERSION
;
1074 args
->mount_server
.version
= NFS_MNT_VERSION
;
1077 if (args
->mount_server
.hostname
)
1078 hostname
= args
->mount_server
.hostname
;
1080 hostname
= args
->nfs_server
.hostname
;
1083 * Construct the mount server's address.
1085 if (args
->mount_server
.address
.ss_family
== AF_UNSPEC
) {
1086 memcpy(sap
, &args
->nfs_server
.address
,
1087 args
->nfs_server
.addrlen
);
1088 args
->mount_server
.addrlen
= args
->nfs_server
.addrlen
;
1092 * autobind will be used if mount_server.port == 0
1094 nfs_set_port(sap
, args
->mount_server
.port
);
1097 * Now ask the mount server to map our export path
1100 status
= nfs_mount(sap
,
1101 args
->mount_server
.addrlen
,
1103 args
->nfs_server
.export_path
,
1104 args
->mount_server
.version
,
1105 args
->mount_server
.protocol
,
1110 dfprintk(MOUNT
, "NFS: unable to mount server %s, error %d",
1116 * Validate the NFS2/NFS3 mount data
1117 * - fills in the mount root filehandle
1119 * For option strings, user space handles the following behaviors:
1121 * + DNS: mapping server host name to IP address ("addr=" option)
1123 * + failure mode: how to behave if a mount request can't be handled
1124 * immediately ("fg/bg" option)
1126 * + retry: how often to retry a mount request ("retry=" option)
1128 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1129 * mountproto=tcp after mountproto=udp, and so on
1131 static int nfs_validate_mount_data(void *options
,
1132 struct nfs_parsed_mount_data
*args
,
1133 struct nfs_fh
*mntfh
,
1134 const char *dev_name
)
1136 struct nfs_mount_data
*data
= (struct nfs_mount_data
*)options
;
1138 memset(args
, 0, sizeof(*args
));
1143 args
->flags
= (NFS_MOUNT_VER3
| NFS_MOUNT_TCP
);
1144 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1145 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1149 args
->acregmax
= 60;
1150 args
->acdirmin
= 30;
1151 args
->acdirmax
= 60;
1152 args
->mount_server
.protocol
= XPRT_TRANSPORT_UDP
;
1153 args
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1155 switch (data
->version
) {
1161 if (data
->flags
& NFS_MOUNT_VER3
)
1163 data
->root
.size
= NFS2_FHSIZE
;
1164 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
1166 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
)
1169 memset(data
->context
, 0, sizeof(data
->context
));
1171 if (data
->flags
& NFS_MOUNT_VER3
)
1172 mntfh
->size
= data
->root
.size
;
1174 mntfh
->size
= NFS2_FHSIZE
;
1176 if (mntfh
->size
> sizeof(mntfh
->data
))
1177 goto out_invalid_fh
;
1179 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
1180 if (mntfh
->size
< sizeof(mntfh
->data
))
1181 memset(mntfh
->data
+ mntfh
->size
, 0,
1182 sizeof(mntfh
->data
) - mntfh
->size
);
1185 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1188 args
->flags
= data
->flags
;
1189 args
->rsize
= data
->rsize
;
1190 args
->wsize
= data
->wsize
;
1191 args
->flags
= data
->flags
;
1192 args
->timeo
= data
->timeo
;
1193 args
->retrans
= data
->retrans
;
1194 args
->acregmin
= data
->acregmin
;
1195 args
->acregmax
= data
->acregmax
;
1196 args
->acdirmin
= data
->acdirmin
;
1197 args
->acdirmax
= data
->acdirmax
;
1199 memcpy(&args
->nfs_server
.address
, &data
->addr
,
1200 sizeof(data
->addr
));
1201 args
->nfs_server
.addrlen
= sizeof(data
->addr
);
1202 if (!nfs_verify_server_address((struct sockaddr
*)
1203 &args
->nfs_server
.address
))
1204 goto out_no_address
;
1206 if (!(data
->flags
& NFS_MOUNT_TCP
))
1207 args
->nfs_server
.protocol
= XPRT_TRANSPORT_UDP
;
1208 /* N.B. caller will free nfs_server.hostname in all cases */
1209 args
->nfs_server
.hostname
= kstrdup(data
->hostname
, GFP_KERNEL
);
1210 args
->namlen
= data
->namlen
;
1211 args
->bsize
= data
->bsize
;
1212 args
->auth_flavors
[0] = data
->pseudoflavor
;
1219 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1222 if (!nfs_verify_server_address((struct sockaddr
*)
1223 &args
->nfs_server
.address
))
1224 goto out_no_address
;
1226 c
= strchr(dev_name
, ':');
1230 /* N.B. caller will free nfs_server.hostname in all cases */
1231 args
->nfs_server
.hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1234 if (strlen(c
) > NFS_MAXPATHLEN
)
1235 return -ENAMETOOLONG
;
1236 args
->nfs_server
.export_path
= c
;
1238 status
= nfs_try_mount(args
, mntfh
);
1246 if (!(args
->flags
& NFS_MOUNT_SECFLAVOUR
))
1247 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1249 #ifndef CONFIG_NFS_V3
1250 if (args
->flags
& NFS_MOUNT_VER3
)
1251 goto out_v3_not_compiled
;
1252 #endif /* !CONFIG_NFS_V3 */
1257 dfprintk(MOUNT
, "NFS: mount program didn't pass any mount data\n");
1261 dfprintk(MOUNT
, "NFS: nfs_mount_data version %d does not support v3\n",
1266 dfprintk(MOUNT
, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1269 #ifndef CONFIG_NFS_V3
1270 out_v3_not_compiled
:
1271 dfprintk(MOUNT
, "NFS: NFSv3 is not compiled into kernel\n");
1272 return -EPROTONOSUPPORT
;
1273 #endif /* !CONFIG_NFS_V3 */
1276 dfprintk(MOUNT
, "NFS: mount program didn't pass remote address\n");
1280 dfprintk(MOUNT
, "NFS: invalid root filehandle\n");
1285 * Initialise the common bits of the superblock
1287 static inline void nfs_initialise_sb(struct super_block
*sb
)
1289 struct nfs_server
*server
= NFS_SB(sb
);
1291 sb
->s_magic
= NFS_SUPER_MAGIC
;
1293 /* We probably want something more informative here */
1294 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
1295 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
1297 if (sb
->s_blocksize
== 0)
1298 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
1299 &sb
->s_blocksize_bits
);
1301 if (server
->flags
& NFS_MOUNT_NOAC
)
1302 sb
->s_flags
|= MS_SYNCHRONOUS
;
1304 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
1308 * Finish setting up an NFS2/3 superblock
1310 static void nfs_fill_super(struct super_block
*sb
,
1311 struct nfs_parsed_mount_data
*data
)
1313 struct nfs_server
*server
= NFS_SB(sb
);
1315 sb
->s_blocksize_bits
= 0;
1316 sb
->s_blocksize
= 0;
1318 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
1320 if (server
->flags
& NFS_MOUNT_VER3
) {
1321 /* The VFS shouldn't apply the umask to mode bits. We will do
1322 * so ourselves when necessary.
1324 sb
->s_flags
|= MS_POSIXACL
;
1325 sb
->s_time_gran
= 1;
1328 sb
->s_op
= &nfs_sops
;
1329 nfs_initialise_sb(sb
);
1333 * Finish setting up a cloned NFS2/3 superblock
1335 static void nfs_clone_super(struct super_block
*sb
,
1336 const struct super_block
*old_sb
)
1338 struct nfs_server
*server
= NFS_SB(sb
);
1340 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1341 sb
->s_blocksize
= old_sb
->s_blocksize
;
1342 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1344 if (server
->flags
& NFS_MOUNT_VER3
) {
1345 /* The VFS shouldn't apply the umask to mode bits. We will do
1346 * so ourselves when necessary.
1348 sb
->s_flags
|= MS_POSIXACL
;
1349 sb
->s_time_gran
= 1;
1352 sb
->s_op
= old_sb
->s_op
;
1353 nfs_initialise_sb(sb
);
1356 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1358 static int nfs_compare_mount_options(const struct super_block
*s
, const struct nfs_server
*b
, int flags
)
1360 const struct nfs_server
*a
= s
->s_fs_info
;
1361 const struct rpc_clnt
*clnt_a
= a
->client
;
1362 const struct rpc_clnt
*clnt_b
= b
->client
;
1364 if ((s
->s_flags
& NFS_MS_MASK
) != (flags
& NFS_MS_MASK
))
1366 if (a
->nfs_client
!= b
->nfs_client
)
1368 if (a
->flags
!= b
->flags
)
1370 if (a
->wsize
!= b
->wsize
)
1372 if (a
->rsize
!= b
->rsize
)
1374 if (a
->acregmin
!= b
->acregmin
)
1376 if (a
->acregmax
!= b
->acregmax
)
1378 if (a
->acdirmin
!= b
->acdirmin
)
1380 if (a
->acdirmax
!= b
->acdirmax
)
1382 if (clnt_a
->cl_auth
->au_flavor
!= clnt_b
->cl_auth
->au_flavor
)
1389 struct nfs_sb_mountdata
{
1390 struct nfs_server
*server
;
1394 static int nfs_set_super(struct super_block
*s
, void *data
)
1396 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1397 struct nfs_server
*server
= sb_mntdata
->server
;
1400 s
->s_flags
= sb_mntdata
->mntflags
;
1401 s
->s_fs_info
= server
;
1402 ret
= set_anon_super(s
, server
);
1404 server
->s_dev
= s
->s_dev
;
1408 static int nfs_compare_super_address(struct nfs_server
*server1
,
1409 struct nfs_server
*server2
)
1411 struct sockaddr
*sap1
, *sap2
;
1413 sap1
= (struct sockaddr
*)&server1
->nfs_client
->cl_addr
;
1414 sap2
= (struct sockaddr
*)&server2
->nfs_client
->cl_addr
;
1416 if (sap1
->sa_family
!= sap2
->sa_family
)
1419 switch (sap1
->sa_family
) {
1421 struct sockaddr_in
*sin1
= (struct sockaddr_in
*)sap1
;
1422 struct sockaddr_in
*sin2
= (struct sockaddr_in
*)sap2
;
1423 if (sin1
->sin_addr
.s_addr
!= sin2
->sin_addr
.s_addr
)
1425 if (sin1
->sin_port
!= sin2
->sin_port
)
1430 struct sockaddr_in6
*sin1
= (struct sockaddr_in6
*)sap1
;
1431 struct sockaddr_in6
*sin2
= (struct sockaddr_in6
*)sap2
;
1432 if (!ipv6_addr_equal(&sin1
->sin6_addr
, &sin2
->sin6_addr
))
1434 if (sin1
->sin6_port
!= sin2
->sin6_port
)
1445 static int nfs_compare_super(struct super_block
*sb
, void *data
)
1447 struct nfs_sb_mountdata
*sb_mntdata
= data
;
1448 struct nfs_server
*server
= sb_mntdata
->server
, *old
= NFS_SB(sb
);
1449 int mntflags
= sb_mntdata
->mntflags
;
1451 if (!nfs_compare_super_address(old
, server
))
1453 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1454 if (old
->flags
& NFS_MOUNT_UNSHARED
)
1456 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
1458 return nfs_compare_mount_options(sb
, server
, mntflags
);
1461 static int nfs_get_sb(struct file_system_type
*fs_type
,
1462 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1464 struct nfs_server
*server
= NULL
;
1465 struct super_block
*s
;
1466 struct nfs_fh mntfh
;
1467 struct nfs_parsed_mount_data data
;
1468 struct dentry
*mntroot
;
1469 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1470 struct nfs_sb_mountdata sb_mntdata
= {
1475 /* Validate the mount data */
1476 error
= nfs_validate_mount_data(raw_data
, &data
, &mntfh
, dev_name
);
1480 /* Get a volume representation */
1481 server
= nfs_create_server(&data
, &mntfh
);
1482 if (IS_ERR(server
)) {
1483 error
= PTR_ERR(server
);
1486 sb_mntdata
.server
= server
;
1488 if (server
->flags
& NFS_MOUNT_UNSHARED
)
1489 compare_super
= NULL
;
1491 /* Get a superblock - note that we may end up sharing one that already exists */
1492 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1498 if (s
->s_fs_info
!= server
) {
1499 nfs_free_server(server
);
1504 /* initial superblock/root creation */
1505 nfs_fill_super(s
, &data
);
1508 mntroot
= nfs_get_root(s
, &mntfh
);
1509 if (IS_ERR(mntroot
)) {
1510 error
= PTR_ERR(mntroot
);
1511 goto error_splat_super
;
1514 s
->s_flags
|= MS_ACTIVE
;
1516 mnt
->mnt_root
= mntroot
;
1520 kfree(data
.nfs_server
.hostname
);
1521 kfree(data
.mount_server
.hostname
);
1525 nfs_free_server(server
);
1529 up_write(&s
->s_umount
);
1530 deactivate_super(s
);
1535 * Destroy an NFS2/3 superblock
1537 static void nfs_kill_super(struct super_block
*s
)
1539 struct nfs_server
*server
= NFS_SB(s
);
1542 nfs_free_server(server
);
1546 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1548 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
1549 const char *dev_name
, void *raw_data
,
1550 struct vfsmount
*mnt
)
1552 struct nfs_clone_mount
*data
= raw_data
;
1553 struct super_block
*s
;
1554 struct nfs_server
*server
;
1555 struct dentry
*mntroot
;
1556 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1557 struct nfs_sb_mountdata sb_mntdata
= {
1562 dprintk("--> nfs_xdev_get_sb()\n");
1564 /* create a new volume representation */
1565 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
1566 if (IS_ERR(server
)) {
1567 error
= PTR_ERR(server
);
1568 goto out_err_noserver
;
1570 sb_mntdata
.server
= server
;
1572 if (server
->flags
& NFS_MOUNT_UNSHARED
)
1573 compare_super
= NULL
;
1575 /* Get a superblock - note that we may end up sharing one that already exists */
1576 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1582 if (s
->s_fs_info
!= server
) {
1583 nfs_free_server(server
);
1588 /* initial superblock/root creation */
1589 nfs_clone_super(s
, data
->sb
);
1592 mntroot
= nfs_get_root(s
, data
->fh
);
1593 if (IS_ERR(mntroot
)) {
1594 error
= PTR_ERR(mntroot
);
1595 goto error_splat_super
;
1597 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
1600 goto error_splat_super
;
1603 s
->s_flags
|= MS_ACTIVE
;
1605 mnt
->mnt_root
= mntroot
;
1607 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1611 nfs_free_server(server
);
1613 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error
);
1617 up_write(&s
->s_umount
);
1618 deactivate_super(s
);
1619 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error
);
1623 #ifdef CONFIG_NFS_V4
1626 * Finish setting up a cloned NFS4 superblock
1628 static void nfs4_clone_super(struct super_block
*sb
,
1629 const struct super_block
*old_sb
)
1631 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
1632 sb
->s_blocksize
= old_sb
->s_blocksize
;
1633 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
1634 sb
->s_time_gran
= 1;
1635 sb
->s_op
= old_sb
->s_op
;
1636 nfs_initialise_sb(sb
);
1640 * Set up an NFS4 superblock
1642 static void nfs4_fill_super(struct super_block
*sb
)
1644 sb
->s_time_gran
= 1;
1645 sb
->s_op
= &nfs4_sops
;
1646 nfs_initialise_sb(sb
);
1650 * If the user didn't specify a port, set the port number to
1651 * the NFS version 4 default port.
1653 static void nfs4_default_port(struct sockaddr
*sap
)
1655 switch (sap
->sa_family
) {
1657 struct sockaddr_in
*ap
= (struct sockaddr_in
*)sap
;
1658 if (ap
->sin_port
== 0)
1659 ap
->sin_port
= htons(NFS_PORT
);
1663 struct sockaddr_in6
*ap
= (struct sockaddr_in6
*)sap
;
1664 if (ap
->sin6_port
== 0)
1665 ap
->sin6_port
= htons(NFS_PORT
);
1672 * Validate NFSv4 mount options
1674 static int nfs4_validate_mount_data(void *options
,
1675 struct nfs_parsed_mount_data
*args
,
1676 const char *dev_name
)
1678 struct sockaddr_in
*ap
;
1679 struct nfs4_mount_data
*data
= (struct nfs4_mount_data
*)options
;
1682 memset(args
, 0, sizeof(*args
));
1687 args
->rsize
= NFS_MAX_FILE_IO_SIZE
;
1688 args
->wsize
= NFS_MAX_FILE_IO_SIZE
;
1692 args
->acregmax
= 60;
1693 args
->acdirmin
= 30;
1694 args
->acdirmax
= 60;
1695 args
->nfs_server
.protocol
= XPRT_TRANSPORT_TCP
;
1697 switch (data
->version
) {
1699 ap
= (struct sockaddr_in
*)&args
->nfs_server
.address
;
1700 if (data
->host_addrlen
> sizeof(args
->nfs_server
.address
))
1701 goto out_no_address
;
1702 if (data
->host_addrlen
== 0)
1703 goto out_no_address
;
1704 args
->nfs_server
.addrlen
= data
->host_addrlen
;
1705 if (copy_from_user(ap
, data
->host_addr
, data
->host_addrlen
))
1707 if (!nfs_verify_server_address((struct sockaddr
*)
1708 &args
->nfs_server
.address
))
1709 goto out_no_address
;
1711 nfs4_default_port((struct sockaddr
*)
1712 &args
->nfs_server
.address
);
1714 switch (data
->auth_flavourlen
) {
1716 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1719 if (copy_from_user(&args
->auth_flavors
[0],
1720 data
->auth_flavours
,
1721 sizeof(args
->auth_flavors
[0])))
1725 goto out_inval_auth
;
1728 c
= strndup_user(data
->hostname
.data
, NFS4_MAXNAMLEN
);
1731 args
->nfs_server
.hostname
= c
;
1733 c
= strndup_user(data
->mnt_path
.data
, NFS4_MAXPATHLEN
);
1736 args
->nfs_server
.export_path
= c
;
1737 dfprintk(MOUNT
, "NFS: MNTPATH: '%s'\n", c
);
1739 c
= strndup_user(data
->client_addr
.data
, 16);
1742 args
->client_address
= c
;
1745 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1749 args
->flags
= data
->flags
& NFS4_MOUNT_FLAGMASK
;
1750 args
->rsize
= data
->rsize
;
1751 args
->wsize
= data
->wsize
;
1752 args
->timeo
= data
->timeo
;
1753 args
->retrans
= data
->retrans
;
1754 args
->acregmin
= data
->acregmin
;
1755 args
->acregmax
= data
->acregmax
;
1756 args
->acdirmin
= data
->acdirmin
;
1757 args
->acdirmax
= data
->acdirmax
;
1758 args
->nfs_server
.protocol
= data
->proto
;
1764 if (nfs_parse_mount_options((char *)options
, args
) == 0)
1767 if (!nfs_verify_server_address((struct sockaddr
*)
1768 &args
->nfs_server
.address
))
1771 nfs4_default_port((struct sockaddr
*)
1772 &args
->nfs_server
.address
);
1774 switch (args
->auth_flavor_len
) {
1776 args
->auth_flavors
[0] = RPC_AUTH_UNIX
;
1781 goto out_inval_auth
;
1785 * Split "dev_name" into "hostname:mntpath".
1787 c
= strchr(dev_name
, ':');
1790 /* while calculating len, pretend ':' is '\0' */
1792 if (len
> NFS4_MAXNAMLEN
)
1793 return -ENAMETOOLONG
;
1794 /* N.B. caller will free nfs_server.hostname in all cases */
1795 args
->nfs_server
.hostname
= kstrndup(dev_name
, len
, GFP_KERNEL
);
1797 c
++; /* step over the ':' */
1799 if (len
> NFS4_MAXPATHLEN
)
1800 return -ENAMETOOLONG
;
1801 args
->nfs_server
.export_path
= kstrndup(c
, len
, GFP_KERNEL
);
1803 dprintk("NFS: MNTPATH: '%s'\n", args
->nfs_server
.export_path
);
1805 if (args
->client_address
== NULL
)
1806 goto out_no_client_address
;
1815 dfprintk(MOUNT
, "NFS4: mount program didn't pass any mount data\n");
1819 dfprintk(MOUNT
, "NFS4: Invalid number of RPC auth flavours %d\n",
1820 data
->auth_flavourlen
);
1824 dfprintk(MOUNT
, "NFS4: mount program didn't pass remote address\n");
1827 out_no_client_address
:
1828 dfprintk(MOUNT
, "NFS4: mount program didn't pass callback address\n");
1833 * Get the superblock for an NFS4 mountpoint
1835 static int nfs4_get_sb(struct file_system_type
*fs_type
,
1836 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1838 struct nfs_parsed_mount_data data
;
1839 struct super_block
*s
;
1840 struct nfs_server
*server
;
1841 struct nfs_fh mntfh
;
1842 struct dentry
*mntroot
;
1843 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1844 struct nfs_sb_mountdata sb_mntdata
= {
1849 /* Validate the mount data */
1850 error
= nfs4_validate_mount_data(raw_data
, &data
, dev_name
);
1854 /* Get a volume representation */
1855 server
= nfs4_create_server(&data
, &mntfh
);
1856 if (IS_ERR(server
)) {
1857 error
= PTR_ERR(server
);
1860 sb_mntdata
.server
= server
;
1862 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
1863 compare_super
= NULL
;
1865 /* Get a superblock - note that we may end up sharing one that already exists */
1866 s
= sget(fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1872 if (s
->s_fs_info
!= server
) {
1873 nfs_free_server(server
);
1878 /* initial superblock/root creation */
1882 mntroot
= nfs4_get_root(s
, &mntfh
);
1883 if (IS_ERR(mntroot
)) {
1884 error
= PTR_ERR(mntroot
);
1885 goto error_splat_super
;
1888 s
->s_flags
|= MS_ACTIVE
;
1890 mnt
->mnt_root
= mntroot
;
1894 kfree(data
.client_address
);
1895 kfree(data
.nfs_server
.export_path
);
1896 kfree(data
.nfs_server
.hostname
);
1900 nfs_free_server(server
);
1904 up_write(&s
->s_umount
);
1905 deactivate_super(s
);
1909 static void nfs4_kill_super(struct super_block
*sb
)
1911 struct nfs_server
*server
= NFS_SB(sb
);
1913 nfs_return_all_delegations(sb
);
1914 kill_anon_super(sb
);
1916 nfs4_renewd_prepare_shutdown(server
);
1917 nfs_free_server(server
);
1921 * Clone an NFS4 server record on xdev traversal (FSID-change)
1923 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
1924 const char *dev_name
, void *raw_data
,
1925 struct vfsmount
*mnt
)
1927 struct nfs_clone_mount
*data
= raw_data
;
1928 struct super_block
*s
;
1929 struct nfs_server
*server
;
1930 struct dentry
*mntroot
;
1931 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
1932 struct nfs_sb_mountdata sb_mntdata
= {
1937 dprintk("--> nfs4_xdev_get_sb()\n");
1939 /* create a new volume representation */
1940 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
1941 if (IS_ERR(server
)) {
1942 error
= PTR_ERR(server
);
1943 goto out_err_noserver
;
1945 sb_mntdata
.server
= server
;
1947 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
1948 compare_super
= NULL
;
1950 /* Get a superblock - note that we may end up sharing one that already exists */
1951 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
1957 if (s
->s_fs_info
!= server
) {
1958 nfs_free_server(server
);
1963 /* initial superblock/root creation */
1964 nfs4_clone_super(s
, data
->sb
);
1967 mntroot
= nfs4_get_root(s
, data
->fh
);
1968 if (IS_ERR(mntroot
)) {
1969 error
= PTR_ERR(mntroot
);
1970 goto error_splat_super
;
1972 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
1975 goto error_splat_super
;
1978 s
->s_flags
|= MS_ACTIVE
;
1980 mnt
->mnt_root
= mntroot
;
1982 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1986 nfs_free_server(server
);
1988 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error
);
1992 up_write(&s
->s_umount
);
1993 deactivate_super(s
);
1994 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error
);
1999 * Create an NFS4 server record on referral traversal
2001 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
, int flags
,
2002 const char *dev_name
, void *raw_data
,
2003 struct vfsmount
*mnt
)
2005 struct nfs_clone_mount
*data
= raw_data
;
2006 struct super_block
*s
;
2007 struct nfs_server
*server
;
2008 struct dentry
*mntroot
;
2009 struct nfs_fh mntfh
;
2010 int (*compare_super
)(struct super_block
*, void *) = nfs_compare_super
;
2011 struct nfs_sb_mountdata sb_mntdata
= {
2016 dprintk("--> nfs4_referral_get_sb()\n");
2018 /* create a new volume representation */
2019 server
= nfs4_create_referral_server(data
, &mntfh
);
2020 if (IS_ERR(server
)) {
2021 error
= PTR_ERR(server
);
2022 goto out_err_noserver
;
2024 sb_mntdata
.server
= server
;
2026 if (server
->flags
& NFS4_MOUNT_UNSHARED
)
2027 compare_super
= NULL
;
2029 /* Get a superblock - note that we may end up sharing one that already exists */
2030 s
= sget(&nfs_fs_type
, compare_super
, nfs_set_super
, &sb_mntdata
);
2036 if (s
->s_fs_info
!= server
) {
2037 nfs_free_server(server
);
2042 /* initial superblock/root creation */
2046 mntroot
= nfs4_get_root(s
, &mntfh
);
2047 if (IS_ERR(mntroot
)) {
2048 error
= PTR_ERR(mntroot
);
2049 goto error_splat_super
;
2051 if (mntroot
->d_inode
->i_op
!= NFS_SB(s
)->nfs_client
->rpc_ops
->dir_inode_ops
) {
2054 goto error_splat_super
;
2057 s
->s_flags
|= MS_ACTIVE
;
2059 mnt
->mnt_root
= mntroot
;
2061 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2065 nfs_free_server(server
);
2067 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
2071 up_write(&s
->s_umount
);
2072 deactivate_super(s
);
2073 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
2077 #endif /* CONFIG_NFS_V4 */