4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/nfs_fs.h>
37 #include <linux/nfs_mount.h>
38 #include <linux/nfs4_mount.h>
39 #include <linux/lockd/bind.h>
40 #include <linux/smp_lock.h>
41 #include <linux/seq_file.h>
42 #include <linux/mount.h>
43 #include <linux/nfs_idmap.h>
44 #include <linux/vfs.h>
45 #include <linux/inet.h>
46 #include <linux/nfs_xdr.h>
47 #include <linux/magic.h>
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_RENAME_DOES_D_MOVE
|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_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
85 static const 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_RENAME_DOES_D_MOVE
|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_RENAME_DOES_D_MOVE
|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_RENAME_DOES_D_MOVE
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
129 static const 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
);
154 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();
170 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
);
209 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
);
247 * Map the security flavour number to a name
249 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
251 static const struct {
252 rpc_authflavor_t flavour
;
255 { RPC_AUTH_NULL
, "null" },
256 { RPC_AUTH_UNIX
, "sys" },
257 { RPC_AUTH_GSS_KRB5
, "krb5" },
258 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
259 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
260 { RPC_AUTH_GSS_LKEY
, "lkey" },
261 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
262 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
263 { RPC_AUTH_GSS_SPKM
, "spkm" },
264 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
265 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
270 for (i
=0; sec_flavours
[i
].flavour
!= -1; i
++) {
271 if (sec_flavours
[i
].flavour
== flavour
)
274 return sec_flavours
[i
].str
;
278 * Describe the mount options in force on this server representation
280 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
, int showdefaults
)
282 static const struct proc_nfs_info
{
287 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
288 { NFS_MOUNT_INTR
, ",intr", "" },
289 { NFS_MOUNT_NOCTO
, ",nocto", "" },
290 { NFS_MOUNT_NOAC
, ",noac", "" },
291 { NFS_MOUNT_NONLM
, ",nolock", "" },
292 { NFS_MOUNT_NOACL
, ",noacl", "" },
293 { NFS_MOUNT_NORDIRPLUS
, ",nordirplus", "" },
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 struct nfs_server
*server
= NFS_SB(vfsmnt
->mnt_sb
);
434 struct rpc_clnt
*rpc
;
436 shrink_submounts(vfsmnt
, &nfs_automount_list
);
438 if (!(flags
& MNT_FORCE
))
440 /* -EIO all pending I/O */
441 rpc
= server
->client_acl
;
443 rpc_killall_tasks(rpc
);
444 rpc
= server
->client
;
446 rpc_killall_tasks(rpc
);
450 * Validate the NFS2/NFS3 mount data
451 * - fills in the mount root filehandle
453 static int nfs_validate_mount_data(struct nfs_mount_data
*data
,
454 struct nfs_fh
*mntfh
)
457 dprintk("%s: missing data argument\n", __FUNCTION__
);
461 if (data
->version
<= 0 || data
->version
> NFS_MOUNT_VERSION
) {
462 dprintk("%s: bad mount version\n", __FUNCTION__
);
466 switch (data
->version
) {
472 if (data
->flags
& NFS_MOUNT_VER3
) {
473 dprintk("%s: mount structure version %d does not support NFSv3\n",
478 data
->root
.size
= NFS2_FHSIZE
;
479 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
481 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
) {
482 dprintk("%s: mount structure version %d does not support strong security\n",
488 memset(data
->context
, 0, sizeof(data
->context
));
491 /* Set the pseudoflavor */
492 if (!(data
->flags
& NFS_MOUNT_SECFLAVOUR
))
493 data
->pseudoflavor
= RPC_AUTH_UNIX
;
495 #ifndef CONFIG_NFS_V3
496 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
497 if (data
->flags
& NFS_MOUNT_VER3
) {
498 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__
);
499 return -EPROTONOSUPPORT
;
501 #endif /* CONFIG_NFS_V3 */
503 /* We now require that the mount process passes the remote address */
504 if (data
->addr
.sin_addr
.s_addr
== INADDR_ANY
) {
505 dprintk("%s: mount program didn't pass remote address!\n",
510 /* Prepare the root filehandle */
511 if (data
->flags
& NFS_MOUNT_VER3
)
512 mntfh
->size
= data
->root
.size
;
514 mntfh
->size
= NFS2_FHSIZE
;
516 if (mntfh
->size
> sizeof(mntfh
->data
)) {
517 dprintk("%s: invalid root filehandle\n", __FUNCTION__
);
521 memcpy(mntfh
->data
, data
->root
.data
, mntfh
->size
);
522 if (mntfh
->size
< sizeof(mntfh
->data
))
523 memset(mntfh
->data
+ mntfh
->size
, 0,
524 sizeof(mntfh
->data
) - mntfh
->size
);
530 * Initialise the common bits of the superblock
532 static inline void nfs_initialise_sb(struct super_block
*sb
)
534 struct nfs_server
*server
= NFS_SB(sb
);
536 sb
->s_magic
= NFS_SUPER_MAGIC
;
538 /* We probably want something more informative here */
539 snprintf(sb
->s_id
, sizeof(sb
->s_id
),
540 "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
542 if (sb
->s_blocksize
== 0)
543 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
544 &sb
->s_blocksize_bits
);
546 if (server
->flags
& NFS_MOUNT_NOAC
)
547 sb
->s_flags
|= MS_SYNCHRONOUS
;
549 nfs_super_set_maxbytes(sb
, server
->maxfilesize
);
553 * Finish setting up an NFS2/3 superblock
555 static void nfs_fill_super(struct super_block
*sb
, struct nfs_mount_data
*data
)
557 struct nfs_server
*server
= NFS_SB(sb
);
559 sb
->s_blocksize_bits
= 0;
562 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
564 if (server
->flags
& NFS_MOUNT_VER3
) {
565 /* The VFS shouldn't apply the umask to mode bits. We will do
566 * so ourselves when necessary.
568 sb
->s_flags
|= MS_POSIXACL
;
572 sb
->s_op
= &nfs_sops
;
573 nfs_initialise_sb(sb
);
577 * Finish setting up a cloned NFS2/3 superblock
579 static void nfs_clone_super(struct super_block
*sb
,
580 const struct super_block
*old_sb
)
582 struct nfs_server
*server
= NFS_SB(sb
);
584 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
585 sb
->s_blocksize
= old_sb
->s_blocksize
;
586 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
588 if (server
->flags
& NFS_MOUNT_VER3
) {
589 /* The VFS shouldn't apply the umask to mode bits. We will do
590 * so ourselves when necessary.
592 sb
->s_flags
|= MS_POSIXACL
;
596 sb
->s_op
= old_sb
->s_op
;
597 nfs_initialise_sb(sb
);
600 static int nfs_set_super(struct super_block
*s
, void *_server
)
602 struct nfs_server
*server
= _server
;
605 s
->s_fs_info
= server
;
606 ret
= set_anon_super(s
, server
);
608 server
->s_dev
= s
->s_dev
;
612 static int nfs_compare_super(struct super_block
*sb
, void *data
)
614 struct nfs_server
*server
= data
, *old
= NFS_SB(sb
);
616 if (old
->nfs_client
!= server
->nfs_client
)
618 if (memcmp(&old
->fsid
, &server
->fsid
, sizeof(old
->fsid
)) != 0)
623 static int nfs_get_sb(struct file_system_type
*fs_type
,
624 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
626 struct nfs_server
*server
= NULL
;
627 struct super_block
*s
;
629 struct nfs_mount_data
*data
= raw_data
;
630 struct dentry
*mntroot
;
633 /* Validate the mount data */
634 error
= nfs_validate_mount_data(data
, &mntfh
);
638 /* Get a volume representation */
639 server
= nfs_create_server(data
, &mntfh
);
640 if (IS_ERR(server
)) {
641 error
= PTR_ERR(server
);
642 goto out_err_noserver
;
645 /* Get a superblock - note that we may end up sharing one that already exists */
646 s
= sget(fs_type
, nfs_compare_super
, nfs_set_super
, server
);
652 if (s
->s_fs_info
!= server
) {
653 nfs_free_server(server
);
658 /* initial superblock/root creation */
660 nfs_fill_super(s
, data
);
663 mntroot
= nfs_get_root(s
, &mntfh
);
664 if (IS_ERR(mntroot
)) {
665 error
= PTR_ERR(mntroot
);
666 goto error_splat_super
;
669 s
->s_flags
|= MS_ACTIVE
;
671 mnt
->mnt_root
= mntroot
;
675 nfs_free_server(server
);
680 up_write(&s
->s_umount
);
686 * Destroy an NFS2/3 superblock
688 static void nfs_kill_super(struct super_block
*s
)
690 struct nfs_server
*server
= NFS_SB(s
);
693 nfs_free_server(server
);
697 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
699 static int nfs_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
700 const char *dev_name
, void *raw_data
,
701 struct vfsmount
*mnt
)
703 struct nfs_clone_mount
*data
= raw_data
;
704 struct super_block
*s
;
705 struct nfs_server
*server
;
706 struct dentry
*mntroot
;
709 dprintk("--> nfs_xdev_get_sb()\n");
711 /* create a new volume representation */
712 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
713 if (IS_ERR(server
)) {
714 error
= PTR_ERR(server
);
715 goto out_err_noserver
;
718 /* Get a superblock - note that we may end up sharing one that already exists */
719 s
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
725 if (s
->s_fs_info
!= server
) {
726 nfs_free_server(server
);
731 /* initial superblock/root creation */
733 nfs_clone_super(s
, data
->sb
);
736 mntroot
= nfs_get_root(s
, data
->fh
);
737 if (IS_ERR(mntroot
)) {
738 error
= PTR_ERR(mntroot
);
739 goto error_splat_super
;
742 s
->s_flags
|= MS_ACTIVE
;
744 mnt
->mnt_root
= mntroot
;
746 dprintk("<-- nfs_xdev_get_sb() = 0\n");
750 nfs_free_server(server
);
752 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error
);
756 up_write(&s
->s_umount
);
758 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error
);
765 * Finish setting up a cloned NFS4 superblock
767 static void nfs4_clone_super(struct super_block
*sb
,
768 const struct super_block
*old_sb
)
770 sb
->s_blocksize_bits
= old_sb
->s_blocksize_bits
;
771 sb
->s_blocksize
= old_sb
->s_blocksize
;
772 sb
->s_maxbytes
= old_sb
->s_maxbytes
;
774 sb
->s_op
= old_sb
->s_op
;
775 nfs_initialise_sb(sb
);
779 * Set up an NFS4 superblock
781 static void nfs4_fill_super(struct super_block
*sb
)
784 sb
->s_op
= &nfs4_sops
;
785 nfs_initialise_sb(sb
);
788 static void *nfs_copy_user_string(char *dst
, struct nfs_string
*src
, int maxlen
)
793 return ERR_PTR(-EINVAL
);
794 if (src
->len
< maxlen
)
797 p
= dst
= kmalloc(maxlen
+ 1, GFP_KERNEL
);
799 return ERR_PTR(-ENOMEM
);
801 if (copy_from_user(dst
, src
->data
, maxlen
)) {
803 return ERR_PTR(-EFAULT
);
810 * Get the superblock for an NFS4 mountpoint
812 static int nfs4_get_sb(struct file_system_type
*fs_type
,
813 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
815 struct nfs4_mount_data
*data
= raw_data
;
816 struct super_block
*s
;
817 struct nfs_server
*server
;
818 struct sockaddr_in addr
;
819 rpc_authflavor_t authflavour
;
821 struct dentry
*mntroot
;
822 char *mntpath
= NULL
, *hostname
= NULL
, ip_addr
[16];
827 dprintk("%s: missing data argument\n", __FUNCTION__
);
830 if (data
->version
<= 0 || data
->version
> NFS4_MOUNT_VERSION
) {
831 dprintk("%s: bad mount version\n", __FUNCTION__
);
835 /* We now require that the mount process passes the remote address */
836 if (data
->host_addrlen
!= sizeof(addr
))
839 if (copy_from_user(&addr
, data
->host_addr
, sizeof(addr
)))
842 if (addr
.sin_family
!= AF_INET
||
843 addr
.sin_addr
.s_addr
== INADDR_ANY
845 dprintk("%s: mount program didn't pass remote IP address!\n",
849 /* RFC3530: The default port for NFS is 2049 */
850 if (addr
.sin_port
== 0)
851 addr
.sin_port
= htons(NFS_PORT
);
853 /* Grab the authentication type */
854 authflavour
= RPC_AUTH_UNIX
;
855 if (data
->auth_flavourlen
!= 0) {
856 if (data
->auth_flavourlen
!= 1) {
857 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
858 __FUNCTION__
, data
->auth_flavourlen
);
860 goto out_err_noserver
;
863 if (copy_from_user(&authflavour
, data
->auth_flavours
,
864 sizeof(authflavour
))) {
866 goto out_err_noserver
;
870 p
= nfs_copy_user_string(NULL
, &data
->hostname
, 256);
875 p
= nfs_copy_user_string(NULL
, &data
->mnt_path
, 1024);
880 dprintk("MNTPATH: %s\n", mntpath
);
882 p
= nfs_copy_user_string(ip_addr
, &data
->client_addr
,
883 sizeof(ip_addr
) - 1);
887 /* Get a volume representation */
888 server
= nfs4_create_server(data
, hostname
, &addr
, mntpath
, ip_addr
,
889 authflavour
, &mntfh
);
890 if (IS_ERR(server
)) {
891 error
= PTR_ERR(server
);
892 goto out_err_noserver
;
895 /* Get a superblock - note that we may end up sharing one that already exists */
896 s
= sget(fs_type
, nfs_compare_super
, nfs_set_super
, server
);
902 if (s
->s_fs_info
!= server
) {
903 nfs_free_server(server
);
908 /* initial superblock/root creation */
913 mntroot
= nfs4_get_root(s
, &mntfh
);
914 if (IS_ERR(mntroot
)) {
915 error
= PTR_ERR(mntroot
);
916 goto error_splat_super
;
919 s
->s_flags
|= MS_ACTIVE
;
921 mnt
->mnt_root
= mntroot
;
928 goto out_err_noserver
;
931 nfs_free_server(server
);
938 up_write(&s
->s_umount
);
940 goto out_err_noserver
;
943 static void nfs4_kill_super(struct super_block
*sb
)
945 struct nfs_server
*server
= NFS_SB(sb
);
947 nfs_return_all_delegations(sb
);
950 nfs4_renewd_prepare_shutdown(server
);
951 nfs_free_server(server
);
955 * Clone an NFS4 server record on xdev traversal (FSID-change)
957 static int nfs4_xdev_get_sb(struct file_system_type
*fs_type
, int flags
,
958 const char *dev_name
, void *raw_data
,
959 struct vfsmount
*mnt
)
961 struct nfs_clone_mount
*data
= raw_data
;
962 struct super_block
*s
;
963 struct nfs_server
*server
;
964 struct dentry
*mntroot
;
967 dprintk("--> nfs4_xdev_get_sb()\n");
969 /* create a new volume representation */
970 server
= nfs_clone_server(NFS_SB(data
->sb
), data
->fh
, data
->fattr
);
971 if (IS_ERR(server
)) {
972 error
= PTR_ERR(server
);
973 goto out_err_noserver
;
976 /* Get a superblock - note that we may end up sharing one that already exists */
977 s
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
983 if (s
->s_fs_info
!= server
) {
984 nfs_free_server(server
);
989 /* initial superblock/root creation */
991 nfs4_clone_super(s
, data
->sb
);
994 mntroot
= nfs4_get_root(s
, data
->fh
);
995 if (IS_ERR(mntroot
)) {
996 error
= PTR_ERR(mntroot
);
997 goto error_splat_super
;
1000 s
->s_flags
|= MS_ACTIVE
;
1002 mnt
->mnt_root
= mntroot
;
1004 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1008 nfs_free_server(server
);
1010 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error
);
1014 up_write(&s
->s_umount
);
1015 deactivate_super(s
);
1016 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error
);
1021 * Create an NFS4 server record on referral traversal
1023 static int nfs4_referral_get_sb(struct file_system_type
*fs_type
, int flags
,
1024 const char *dev_name
, void *raw_data
,
1025 struct vfsmount
*mnt
)
1027 struct nfs_clone_mount
*data
= raw_data
;
1028 struct super_block
*s
;
1029 struct nfs_server
*server
;
1030 struct dentry
*mntroot
;
1031 struct nfs_fh mntfh
;
1034 dprintk("--> nfs4_referral_get_sb()\n");
1036 /* create a new volume representation */
1037 server
= nfs4_create_referral_server(data
, &mntfh
);
1038 if (IS_ERR(server
)) {
1039 error
= PTR_ERR(server
);
1040 goto out_err_noserver
;
1043 /* Get a superblock - note that we may end up sharing one that already exists */
1044 s
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
1050 if (s
->s_fs_info
!= server
) {
1051 nfs_free_server(server
);
1056 /* initial superblock/root creation */
1061 mntroot
= nfs4_get_root(s
, &mntfh
);
1062 if (IS_ERR(mntroot
)) {
1063 error
= PTR_ERR(mntroot
);
1064 goto error_splat_super
;
1067 s
->s_flags
|= MS_ACTIVE
;
1069 mnt
->mnt_root
= mntroot
;
1071 dprintk("<-- nfs4_referral_get_sb() = 0\n");
1075 nfs_free_server(server
);
1077 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error
);
1081 up_write(&s
->s_umount
);
1082 deactivate_super(s
);
1083 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error
);
1087 #endif /* CONFIG_NFS_V4 */