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/config.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
27 #include <linux/time.h>
28 #include <linux/kernel.h>
30 #include <linux/string.h>
31 #include <linux/stat.h>
32 #include <linux/errno.h>
33 #include <linux/unistd.h>
34 #include <linux/sunrpc/clnt.h>
35 #include <linux/sunrpc/stats.h>
36 #include <linux/sunrpc/metrics.h>
37 #include <linux/nfs_fs.h>
38 #include <linux/nfs_mount.h>
39 #include <linux/nfs4_mount.h>
40 #include <linux/lockd/bind.h>
41 #include <linux/smp_lock.h>
42 #include <linux/seq_file.h>
43 #include <linux/mount.h>
44 #include <linux/nfs_idmap.h>
45 #include <linux/vfs.h>
46 #include <linux/inet.h>
47 #include <linux/nfs_xdr.h>
49 #include <asm/system.h>
50 #include <asm/uaccess.h>
54 #include "delegation.h"
58 #define NFSDBG_FACILITY NFSDBG_VFS
60 static void nfs_umount_begin(struct vfsmount
*, int);
61 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
62 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
63 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
64 static int nfs_get_sb(struct file_system_type
*, int, const char *, void *, struct vfsmount
*);
65 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
,
66 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
67 static void nfs_kill_super(struct super_block
*);
69 static struct file_system_type nfs_fs_type
= {
73 .kill_sb
= nfs_kill_super
,
74 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
77 struct file_system_type nfs_xdev_fs_type
= {
80 .get_sb
= nfs_xdev_get_sb
,
81 .kill_sb
= nfs_kill_super
,
82 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
85 static struct super_operations nfs_sops
= {
86 .alloc_inode
= nfs_alloc_inode
,
87 .destroy_inode
= nfs_destroy_inode
,
88 .write_inode
= nfs_write_inode
,
90 .clear_inode
= nfs_clear_inode
,
91 .umount_begin
= nfs_umount_begin
,
92 .show_options
= nfs_show_options
,
93 .show_stats
= nfs_show_stats
,
97 static int nfs4_get_sb(struct file_system_type
*fs_type
,
98 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
99 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
,
100 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
101 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
,
102 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
103 static void nfs4_kill_super(struct super_block
*sb
);
105 static struct file_system_type nfs4_fs_type
= {
106 .owner
= THIS_MODULE
,
108 .get_sb
= nfs4_get_sb
,
109 .kill_sb
= nfs4_kill_super
,
110 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
113 struct file_system_type nfs4_xdev_fs_type
= {
114 .owner
= THIS_MODULE
,
116 .get_sb
= nfs4_xdev_get_sb
,
117 .kill_sb
= nfs4_kill_super
,
118 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
121 struct file_system_type nfs4_referral_fs_type
= {
122 .owner
= THIS_MODULE
,
124 .get_sb
= nfs4_referral_get_sb
,
125 .kill_sb
= nfs4_kill_super
,
126 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
129 static struct super_operations nfs4_sops
= {
130 .alloc_inode
= nfs_alloc_inode
,
131 .destroy_inode
= nfs_destroy_inode
,
132 .write_inode
= nfs_write_inode
,
133 .statfs
= nfs_statfs
,
134 .clear_inode
= nfs4_clear_inode
,
135 .umount_begin
= nfs_umount_begin
,
136 .show_options
= nfs_show_options
,
137 .show_stats
= nfs_show_stats
,
141 static struct shrinker
*acl_shrinker
;
144 * Register the NFS filesystems
146 int __init
register_nfs_fs(void)
150 ret
= register_filesystem(&nfs_fs_type
);
155 ret
= nfs_register_sysctl();
158 ret
= register_filesystem(&nfs4_fs_type
);
162 acl_shrinker
= set_shrinker(DEFAULT_SEEKS
, nfs_access_cache_shrinker
);
167 nfs_unregister_sysctl();
169 unregister_filesystem(&nfs_fs_type
);
176 * Unregister the NFS filesystems
178 void __exit
unregister_nfs_fs(void)
180 if (acl_shrinker
!= NULL
)
181 remove_shrinker(acl_shrinker
);
183 unregister_filesystem(&nfs4_fs_type
);
184 nfs_unregister_sysctl();
186 unregister_filesystem(&nfs_fs_type
);
190 * Deliver file system statistics to userspace
192 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
194 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
195 unsigned char blockbits
;
196 unsigned long blockres
;
197 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
198 struct nfs_fattr fattr
;
199 struct nfs_fsstat res
= {
206 error
= server
->nfs_client
->rpc_ops
->statfs(server
, fh
, &res
);
207 buf
->f_type
= NFS_SUPER_MAGIC
;
212 * Current versions of glibc do not correctly handle the
213 * case where f_frsize != f_bsize. Eventually we want to
214 * report the value of wtmult in this field.
216 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
219 * On most *nix systems, f_blocks, f_bfree, and f_bavail
220 * are reported in units of f_frsize. Linux hasn't had
221 * an f_frsize field in its statfs struct until recently,
222 * thus historically Linux's sys_statfs reports these
223 * fields in units of f_bsize.
225 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
226 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
227 blockres
= (1 << blockbits
) - 1;
228 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
229 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
230 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
232 buf
->f_files
= res
.tfiles
;
233 buf
->f_ffree
= res
.afiles
;
235 buf
->f_namelen
= server
->namelen
;
241 dprintk("%s: statfs error = %d\n", __FUNCTION__
, -error
);
242 buf
->f_bsize
= buf
->f_blocks
= buf
->f_bfree
= buf
->f_bavail
= -1;
248 * Map the security flavour number to a name
250 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
252 static const struct {
253 rpc_authflavor_t flavour
;
256 { RPC_AUTH_NULL
, "null" },
257 { RPC_AUTH_UNIX
, "sys" },
258 { RPC_AUTH_GSS_KRB5
, "krb5" },
259 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
260 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
261 { RPC_AUTH_GSS_LKEY
, "lkey" },
262 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
263 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
264 { RPC_AUTH_GSS_SPKM
, "spkm" },
265 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
266 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
271 for (i
=0; sec_flavours
[i
].flavour
!= -1; i
++) {
272 if (sec_flavours
[i
].flavour
== flavour
)
275 return sec_flavours
[i
].str
;
279 * Describe the mount options in force on this server representation
281 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
, int showdefaults
)
283 static const struct proc_nfs_info
{
288 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
289 { NFS_MOUNT_INTR
, ",intr", "" },
290 { NFS_MOUNT_NOCTO
, ",nocto", "" },
291 { NFS_MOUNT_NOAC
, ",noac", "" },
292 { NFS_MOUNT_NONLM
, ",nolock", "" },
293 { NFS_MOUNT_NOACL
, ",noacl", "" },
296 const struct proc_nfs_info
*nfs_infop
;
297 struct nfs_client
*clp
= nfss
->nfs_client
;
301 seq_printf(m
, ",vers=%d", clp
->rpc_ops
->version
);
302 seq_printf(m
, ",rsize=%d", nfss
->rsize
);
303 seq_printf(m
, ",wsize=%d", nfss
->wsize
);
304 if (nfss
->acregmin
!= 3*HZ
|| showdefaults
)
305 seq_printf(m
, ",acregmin=%d", nfss
->acregmin
/HZ
);
306 if (nfss
->acregmax
!= 60*HZ
|| showdefaults
)
307 seq_printf(m
, ",acregmax=%d", nfss
->acregmax
/HZ
);
308 if (nfss
->acdirmin
!= 30*HZ
|| showdefaults
)
309 seq_printf(m
, ",acdirmin=%d", nfss
->acdirmin
/HZ
);
310 if (nfss
->acdirmax
!= 60*HZ
|| showdefaults
)
311 seq_printf(m
, ",acdirmax=%d", nfss
->acdirmax
/HZ
);
312 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
313 if (nfss
->flags
& nfs_infop
->flag
)
314 seq_puts(m
, nfs_infop
->str
);
316 seq_puts(m
, nfs_infop
->nostr
);
318 switch (nfss
->client
->cl_xprt
->prot
) {
326 snprintf(buf
, sizeof(buf
), "%u", nfss
->client
->cl_xprt
->prot
);
329 seq_printf(m
, ",proto=%s", proto
);
330 seq_printf(m
, ",timeo=%lu", 10U * clp
->retrans_timeo
/ HZ
);
331 seq_printf(m
, ",retrans=%u", clp
->retrans_count
);
332 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
336 * Describe the mount options on this VFS mountpoint
338 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
340 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
342 nfs_show_mount_options(m
, nfss
, 0);
344 seq_puts(m
, ",addr=");
345 seq_escape(m
, nfss
->nfs_client
->cl_hostname
, " \t\n\\");
351 * Present statistical information for this VFS mountpoint
353 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
356 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
357 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
358 struct nfs_iostats totals
= { };
360 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
363 * Display all mount option settings
365 seq_printf(m
, "\n\topts:\t");
366 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
367 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
368 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
369 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
370 nfs_show_mount_options(m
, nfss
, 1);
372 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
374 seq_printf(m
, "\n\tcaps:\t");
375 seq_printf(m
, "caps=0x%x", nfss
->caps
);
376 seq_printf(m
, ",wtmult=%d", nfss
->wtmult
);
377 seq_printf(m
, ",dtsize=%d", nfss
->dtsize
);
378 seq_printf(m
, ",bsize=%d", nfss
->bsize
);
379 seq_printf(m
, ",namelen=%d", nfss
->namelen
);
382 if (nfss
->nfs_client
->cl_nfsversion
== 4) {
383 seq_printf(m
, "\n\tnfsv4:\t");
384 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
385 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
386 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
391 * Display security flavor in effect for this mount
393 seq_printf(m
, "\n\tsec:\tflavor=%d", auth
->au_ops
->au_flavor
);
395 seq_printf(m
, ",pseudoflavor=%d", auth
->au_flavor
);
398 * Display superblock I/O counters
400 for_each_possible_cpu(cpu
) {
401 struct nfs_iostats
*stats
;
404 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
406 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
407 totals
.events
[i
] += stats
->events
[i
];
408 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
409 totals
.bytes
[i
] += stats
->bytes
[i
];
414 seq_printf(m
, "\n\tevents:\t");
415 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
416 seq_printf(m
, "%lu ", totals
.events
[i
]);
417 seq_printf(m
, "\n\tbytes:\t");
418 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
419 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
422 rpc_print_iostats(m
, nfss
->client
);
428 * Begin unmount by attempting to remove all automounted mountpoints we added
429 * in response to xdev traversals and referrals
431 static void nfs_umount_begin(struct vfsmount
*vfsmnt
, int flags
)
433 shrink_submounts(vfsmnt
, &nfs_automount_list
);
437 * Validate the NFS2/NFS3 mount data
438 * - fills in the mount root filehandle
440 static int nfs_validate_mount_data(struct nfs_mount_data
*data
,
441 struct nfs_fh
*mntfh
)
444 dprintk("%s: missing data argument\n", __FUNCTION__
);
448 if (data
->version
<= 0 || data
->version
> NFS_MOUNT_VERSION
) {
449 dprintk("%s: bad mount version\n", __FUNCTION__
);
453 switch (data
->version
) {
459 if (data
->flags
& NFS_MOUNT_VER3
) {
460 dprintk("%s: mount structure version %d does not support NFSv3\n",
465 data
->root
.size
= NFS2_FHSIZE
;
466 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
468 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
) {
469 dprintk("%s: mount structure version %d does not support strong security\n",
474 /* Fill in pseudoflavor for mount version < 5 */
475 data
->pseudoflavor
= RPC_AUTH_UNIX
;
477 memset(data
->context
, 0, sizeof(data
->context
));
480 #ifndef CONFIG_NFS_V3
481 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
482 if (data
->flags
& NFS_MOUNT_VER3
) {
483 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__
);
484 return -EPROTONOSUPPORT
;
486 #endif /* CONFIG_NFS_V3 */
488 /* We now require that the mount process passes the remote address */
489 if (data
->addr
.sin_addr
.s_addr
== INADDR_ANY
) {
490 dprintk("%s: mount program didn't pass remote address!\n",
495 /* Prepare the root filehandle */
496 if (data
->flags
& NFS_MOUNT_VER3
)
497 mntfh
->size
= data
->root
.size
;
499 mntfh
->size
= NFS2_FHSIZE
;
501 if (mntfh
->size
> sizeof(mntfh
->data
)) {
502 dprintk("%s: invalid root filehandle\n", __FUNCTION__
);
506 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
507 if (mntfh
->size
< sizeof(mntfh
->data
))
508 memset(mntfh
->data
+ mntfh
->size
, 0,
509 sizeof(mntfh
->data
) - mntfh
->size
);
515 * Initialise the common bits of the superblock
517 static inline void nfs_initialise_sb(struct super_block
*sb
)
519 struct nfs_server
*server
= NFS_SB(sb
);
521 sb
->s_magic
= NFS_SUPER_MAGIC
;
523 /* We probably want something more informative here */
524 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
525 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
527 if (sb
->s_blocksize
== 0)
528 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
529 &sb
->s_blocksize_bits
);
531 if (server
->flags
& NFS_MOUNT_NOAC
)
532 sb
->s_flags
|= MS_SYNCHRONOUS
;
534 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
538 * Finish setting up an NFS2/3 superblock
540 static void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_data
*data
)
542 struct nfs_server
*server
= NFS_SB(sb
);
544 sb
->s_blocksize_bits
= 0;
547 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
549 if (server
->flags
& NFS_MOUNT_VER3
) {
550 /* The VFS shouldn't apply the umask to mode bits. We will do
551 * so ourselves when necessary.
553 sb
->s_flags
|= MS_POSIXACL
;
557 sb
->s_op
= &nfs_sops
;
558 nfs_initialise_sb(sb
);
562 * Finish setting up a cloned NFS2/3 superblock
564 static void nfs_clone_super(struct super_block
*sb
,
565 const struct super_block
*old_sb
)
567 struct nfs_server
*server
= NFS_SB(sb
);
569 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
570 sb
->s_blocksize
= old_sb
->s_blocksize
;
571 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
573 if (server
->flags
& NFS_MOUNT_VER3
) {
574 /* The VFS shouldn't apply the umask to mode bits. We will do
575 * so ourselves when necessary.
577 sb
->s_flags
|= MS_POSIXACL
;
581 sb
->s_op
= old_sb
->s_op
;
582 nfs_initialise_sb(sb
);
585 static int nfs_set_super(struct super_block
*s
, void *_server
)
587 struct nfs_server
*server
= _server
;
590 s
->s_fs_info
= server
;
591 ret
= set_anon_super(s
, server
);
593 server
->s_dev
= s
->s_dev
;
597 static int nfs_compare_super(struct super_block
*sb
, void *data
)
599 struct nfs_server
*server
= data
, *old
= NFS_SB(sb
);
601 if (old
->nfs_client
!= server
->nfs_client
)
603 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
608 static int nfs_get_sb(struct file_system_type
*fs_type
,
609 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
611 struct nfs_server
*server
= NULL
;
612 struct super_block
*s
;
614 struct nfs_mount_data
*data
= raw_data
;
615 struct dentry
*mntroot
;
618 /* Validate the mount data */
619 error
= nfs_validate_mount_data(data
, &mntfh
);
623 /* Get a volume representation */
624 server
= nfs_create_server(data
, &mntfh
);
625 if (IS_ERR(server
)) {
626 error
= PTR_ERR(server
);
627 goto out_err_noserver
;
630 /* Get a superblock - note that we may end up sharing one that already exists */
631 s
= sget(fs_type
, nfs_compare_super
, nfs_set_super
, server
);
637 if (s
->s_fs_info
!= server
) {
638 nfs_free_server(server
);
643 /* initial superblock/root creation */
645 nfs_fill_super(s
, data
);
648 mntroot
= nfs_get_root(s
, &mntfh
);
649 if (IS_ERR(mntroot
)) {
650 error
= PTR_ERR(mntroot
);
651 goto error_splat_super
;
654 s
->s_flags
|= MS_ACTIVE
;
656 mnt
->mnt_root
= mntroot
;
660 nfs_free_server(server
);
665 up_write(&s
->s_umount
);
671 * Destroy an NFS2/3 superblock
673 static void nfs_kill_super(struct super_block
*s
)
675 struct nfs_server
*server
= NFS_SB(s
);
678 nfs_free_server(server
);
682 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
684 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
685 const char *dev_name
, void *raw_data
,
686 struct vfsmount
*mnt
)
688 struct nfs_clone_mount
*data
= raw_data
;
689 struct super_block
*s
;
690 struct nfs_server
*server
;
691 struct dentry
*mntroot
;
694 dprintk("--> nfs_xdev_get_sb()\n");
696 /* create a new volume representation */
697 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
698 if (IS_ERR(server
)) {
699 error
= PTR_ERR(server
);
700 goto out_err_noserver
;
703 /* Get a superblock - note that we may end up sharing one that already exists */
704 s
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
710 if (s
->s_fs_info
!= server
) {
711 nfs_free_server(server
);
716 /* initial superblock/root creation */
718 nfs_clone_super(s
, data
->sb
);
721 mntroot
= nfs_get_root(s
, data
->fh
);
722 if (IS_ERR(mntroot
)) {
723 error
= PTR_ERR(mntroot
);
724 goto error_splat_super
;
727 s
->s_flags
|= MS_ACTIVE
;
729 mnt
->mnt_root
= mntroot
;
731 dprintk("<-- nfs_xdev_get_sb() = 0\n");
735 nfs_free_server(server
);
737 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error
);
741 up_write(&s
->s_umount
);
743 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error
);
750 * Finish setting up a cloned NFS4 superblock
752 static void nfs4_clone_super(struct super_block
*sb
,
753 const struct super_block
*old_sb
)
755 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
756 sb
->s_blocksize
= old_sb
->s_blocksize
;
757 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
759 sb
->s_op
= old_sb
->s_op
;
760 nfs_initialise_sb(sb
);
764 * Set up an NFS4 superblock
766 static void nfs4_fill_super(struct super_block
*sb
)
769 sb
->s_op
= &nfs4_sops
;
770 nfs_initialise_sb(sb
);
773 static void *nfs_copy_user_string(char *dst
, struct nfs_string
*src
, int maxlen
)
778 return ERR_PTR(-EINVAL
);
779 if (src
->len
< maxlen
)
782 p
= dst
= kmalloc(maxlen
+ 1, GFP_KERNEL
);
784 return ERR_PTR(-ENOMEM
);
786 if (copy_from_user(dst
, src
->data
, maxlen
)) {
788 return ERR_PTR(-EFAULT
);
795 * Get the superblock for an NFS4 mountpoint
797 static int nfs4_get_sb(struct file_system_type
*fs_type
,
798 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
800 struct nfs4_mount_data
*data
= raw_data
;
801 struct super_block
*s
;
802 struct nfs_server
*server
;
803 struct sockaddr_in addr
;
804 rpc_authflavor_t authflavour
;
806 struct dentry
*mntroot
;
807 char *mntpath
= NULL
, *hostname
= NULL
, ip_addr
[16];
812 dprintk("%s: missing data argument\n", __FUNCTION__
);
815 if (data
->version
<= 0 || data
->version
> NFS4_MOUNT_VERSION
) {
816 dprintk("%s: bad mount version\n", __FUNCTION__
);
820 /* We now require that the mount process passes the remote address */
821 if (data
->host_addrlen
!= sizeof(addr
))
824 if (copy_from_user(&addr
, data
->host_addr
, sizeof(addr
)))
827 if (addr
.sin_family
!= AF_INET
||
828 addr
.sin_addr
.s_addr
== INADDR_ANY
830 dprintk("%s: mount program didn't pass remote IP address!\n",
835 /* Grab the authentication type */
836 authflavour
= RPC_AUTH_UNIX
;
837 if (data
->auth_flavourlen
!= 0) {
838 if (data
->auth_flavourlen
!= 1) {
839 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
840 __FUNCTION__
, data
->auth_flavourlen
);
842 goto out_err_noserver
;
845 if (copy_from_user(&authflavour
, data
->auth_flavours
,
846 sizeof(authflavour
))) {
848 goto out_err_noserver
;
852 p
= nfs_copy_user_string(NULL
, &data
->hostname
, 256);
857 p
= nfs_copy_user_string(NULL
, &data
->mnt_path
, 1024);
862 dprintk("MNTPATH: %s\n", mntpath
);
864 p
= nfs_copy_user_string(ip_addr
, &data
->client_addr
,
865 sizeof(ip_addr
) - 1);
869 /* Get a volume representation */
870 server
= nfs4_create_server(data
, hostname
, &addr
, mntpath
, ip_addr
,
871 authflavour
, &mntfh
);
872 if (IS_ERR(server
)) {
873 error
= PTR_ERR(server
);
874 goto out_err_noserver
;
877 /* Get a superblock - note that we may end up sharing one that already exists */
878 s
= sget(fs_type
, nfs_compare_super
, nfs_set_super
, server
);
885 /* initial superblock/root creation */
890 nfs_free_server(server
);
893 mntroot
= nfs4_get_root(s
, &mntfh
);
894 if (IS_ERR(mntroot
)) {
895 error
= PTR_ERR(mntroot
);
896 goto error_splat_super
;
899 s
->s_flags
|= MS_ACTIVE
;
901 mnt
->mnt_root
= mntroot
;
908 goto out_err_noserver
;
911 nfs_free_server(server
);
918 up_write(&s
->s_umount
);
920 goto out_err_noserver
;
923 static void nfs4_kill_super(struct super_block
*sb
)
925 struct nfs_server
*server
= NFS_SB(sb
);
927 nfs_return_all_delegations(sb
);
930 nfs4_renewd_prepare_shutdown(server
);
931 nfs_free_server(server
);
935 * Clone an NFS4 server record on xdev traversal (FSID-change)
937 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
938 const char *dev_name
, void *raw_data
,
939 struct vfsmount
*mnt
)
941 struct nfs_clone_mount
*data
= raw_data
;
942 struct super_block
*s
;
943 struct nfs_server
*server
;
944 struct dentry
*mntroot
;
947 dprintk("--> nfs4_xdev_get_sb()\n");
949 /* create a new volume representation */
950 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
951 if (IS_ERR(server
)) {
952 error
= PTR_ERR(server
);
953 goto out_err_noserver
;
956 /* Get a superblock - note that we may end up sharing one that already exists */
957 s
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
963 if (s
->s_fs_info
!= server
) {
964 nfs_free_server(server
);
969 /* initial superblock/root creation */
971 nfs4_clone_super(s
, data
->sb
);
974 mntroot
= nfs4_get_root(s
, data
->fh
);
975 if (IS_ERR(mntroot
)) {
976 error
= PTR_ERR(mntroot
);
977 goto error_splat_super
;
980 s
->s_flags
|= MS_ACTIVE
;
982 mnt
->mnt_root
= mntroot
;
984 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
988 nfs_free_server(server
);
990 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error
);
994 up_write(&s
->s_umount
);
996 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error
);
1001 * Create an NFS4 server record on referral traversal
1003 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
, int flags
,
1004 const char *dev_name
, void *raw_data
,
1005 struct vfsmount
*mnt
)
1007 struct nfs_clone_mount
*data
= raw_data
;
1008 struct super_block
*s
;
1009 struct nfs_server
*server
;
1010 struct dentry
*mntroot
;
1011 struct nfs_fh mntfh
;
1014 dprintk("--> nfs4_referral_get_sb()\n");
1016 /* create a new volume representation */
1017 server
= nfs4_create_referral_server(data
, &mntfh
);
1018 if (IS_ERR(server
)) {
1019 error
= PTR_ERR(server
);
1020 goto out_err_noserver
;
1023 /* Get a superblock - note that we may end up sharing one that already exists */
1024 s
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
1030 if (s
->s_fs_info
!= server
) {
1031 nfs_free_server(server
);
1036 /* initial superblock/root creation */
1041 mntroot
= nfs4_get_root(s
, data
->fh
);
1042 if (IS_ERR(mntroot
)) {
1043 error
= PTR_ERR(mntroot
);
1044 goto error_splat_super
;
1047 s
->s_flags
|= MS_ACTIVE
;
1049 mnt
->mnt_root
= mntroot
;
1051 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1055 nfs_free_server(server
);
1057 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
1061 up_write(&s
->s_umount
);
1062 deactivate_super(s
);
1063 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
1067 #endif /* CONFIG_NFS_V4 */