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>
18 #include <linux/config.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
22 #include <linux/time.h>
23 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/stat.h>
27 #include <linux/errno.h>
28 #include <linux/unistd.h>
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/sunrpc/stats.h>
31 #include <linux/sunrpc/metrics.h>
32 #include <linux/nfs_fs.h>
33 #include <linux/nfs_mount.h>
34 #include <linux/nfs4_mount.h>
35 #include <linux/lockd/bind.h>
36 #include <linux/smp_lock.h>
37 #include <linux/seq_file.h>
38 #include <linux/mount.h>
39 #include <linux/nfs_idmap.h>
40 #include <linux/vfs.h>
41 #include <linux/inet.h>
42 #include <linux/nfs_xdr.h>
44 #include <asm/system.h>
45 #include <asm/uaccess.h>
49 #include "delegation.h"
53 #define NFSDBG_FACILITY NFSDBG_VFS
55 /* Maximum number of readahead requests
56 * FIXME: this should really be a sysctl so that users may tune it to suit
57 * their needs. People that do NFS over a slow network, might for
58 * instance want to reduce it to something closer to 1 for improved
59 * interactive response.
61 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
66 static struct rpc_version
* nfs_version
[] = {
70 #if defined(CONFIG_NFS_V3)
72 #elif defined(CONFIG_NFS_V4)
75 #if defined(CONFIG_NFS_V4)
80 static struct rpc_program nfs_program
= {
82 .number
= NFS_PROGRAM
,
83 .nrvers
= ARRAY_SIZE(nfs_version
),
84 .version
= nfs_version
,
85 .stats
= &nfs_rpcstat
,
86 .pipe_dir_name
= "/nfs",
89 struct rpc_stat nfs_rpcstat
= {
90 .program
= &nfs_program
94 #ifdef CONFIG_NFS_V3_ACL
95 static struct rpc_stat nfsacl_rpcstat
= { &nfsacl_program
};
96 static struct rpc_version
* nfsacl_version
[] = {
97 [3] = &nfsacl_version3
,
100 struct rpc_program nfsacl_program
= {
102 .number
= NFS_ACL_PROGRAM
,
103 .nrvers
= ARRAY_SIZE(nfsacl_version
),
104 .version
= nfsacl_version
,
105 .stats
= &nfsacl_rpcstat
,
107 #endif /* CONFIG_NFS_V3_ACL */
109 static void nfs_umount_begin(struct vfsmount
*, int);
110 static int nfs_statfs(struct dentry
*, struct kstatfs
*);
111 static int nfs_show_options(struct seq_file
*, struct vfsmount
*);
112 static int nfs_show_stats(struct seq_file
*, struct vfsmount
*);
113 static int nfs_get_sb(struct file_system_type
*, int, const char *, void *, struct vfsmount
*);
114 static int nfs_clone_nfs_sb(struct file_system_type
*fs_type
,
115 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
116 static void nfs_kill_super(struct super_block
*);
118 static struct file_system_type nfs_fs_type
= {
119 .owner
= THIS_MODULE
,
121 .get_sb
= nfs_get_sb
,
122 .kill_sb
= nfs_kill_super
,
123 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
126 struct file_system_type clone_nfs_fs_type
= {
127 .owner
= THIS_MODULE
,
129 .get_sb
= nfs_clone_nfs_sb
,
130 .kill_sb
= nfs_kill_super
,
131 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
134 static struct super_operations nfs_sops
= {
135 .alloc_inode
= nfs_alloc_inode
,
136 .destroy_inode
= nfs_destroy_inode
,
137 .write_inode
= nfs_write_inode
,
138 .statfs
= nfs_statfs
,
139 .clear_inode
= nfs_clear_inode
,
140 .umount_begin
= nfs_umount_begin
,
141 .show_options
= nfs_show_options
,
142 .show_stats
= nfs_show_stats
,
146 static int nfs4_get_sb(struct file_system_type
*fs_type
,
147 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
148 static int nfs_clone_nfs4_sb(struct file_system_type
*fs_type
,
149 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
150 static int nfs_referral_nfs4_sb(struct file_system_type
*fs_type
,
151 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
);
152 static void nfs4_kill_super(struct super_block
*sb
);
154 static struct file_system_type nfs4_fs_type
= {
155 .owner
= THIS_MODULE
,
157 .get_sb
= nfs4_get_sb
,
158 .kill_sb
= nfs4_kill_super
,
159 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
162 struct file_system_type clone_nfs4_fs_type
= {
163 .owner
= THIS_MODULE
,
165 .get_sb
= nfs_clone_nfs4_sb
,
166 .kill_sb
= nfs4_kill_super
,
167 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
170 struct file_system_type nfs_referral_nfs4_fs_type
= {
171 .owner
= THIS_MODULE
,
173 .get_sb
= nfs_referral_nfs4_sb
,
174 .kill_sb
= nfs4_kill_super
,
175 .fs_flags
= FS_ODD_RENAME
|FS_REVAL_DOT
|FS_BINARY_MOUNTDATA
,
178 static struct super_operations nfs4_sops
= {
179 .alloc_inode
= nfs_alloc_inode
,
180 .destroy_inode
= nfs_destroy_inode
,
181 .write_inode
= nfs_write_inode
,
182 .statfs
= nfs_statfs
,
183 .clear_inode
= nfs4_clear_inode
,
184 .umount_begin
= nfs_umount_begin
,
185 .show_options
= nfs_show_options
,
186 .show_stats
= nfs_show_stats
,
190 static struct shrinker
*acl_shrinker
;
193 * Register the NFS filesystems
195 int __init
register_nfs_fs(void)
199 ret
= register_filesystem(&nfs_fs_type
);
204 ret
= nfs_register_sysctl();
207 ret
= register_filesystem(&nfs4_fs_type
);
211 acl_shrinker
= set_shrinker(DEFAULT_SEEKS
, nfs_access_cache_shrinker
);
216 nfs_unregister_sysctl();
218 unregister_filesystem(&nfs_fs_type
);
225 * Unregister the NFS filesystems
227 void __exit
unregister_nfs_fs(void)
229 if (acl_shrinker
!= NULL
)
230 remove_shrinker(acl_shrinker
);
232 unregister_filesystem(&nfs4_fs_type
);
233 nfs_unregister_sysctl();
235 unregister_filesystem(&nfs_fs_type
);
239 * Deliver file system statistics to userspace
241 static int nfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
243 struct nfs_server
*server
= NFS_SB(dentry
->d_sb
);
244 unsigned char blockbits
;
245 unsigned long blockres
;
246 struct nfs_fh
*fh
= NFS_FH(dentry
->d_inode
);
247 struct nfs_fattr fattr
;
248 struct nfs_fsstat res
= {
255 error
= server
->rpc_ops
->statfs(server
, fh
, &res
);
256 buf
->f_type
= NFS_SUPER_MAGIC
;
261 * Current versions of glibc do not correctly handle the
262 * case where f_frsize != f_bsize. Eventually we want to
263 * report the value of wtmult in this field.
265 buf
->f_frsize
= dentry
->d_sb
->s_blocksize
;
268 * On most *nix systems, f_blocks, f_bfree, and f_bavail
269 * are reported in units of f_frsize. Linux hasn't had
270 * an f_frsize field in its statfs struct until recently,
271 * thus historically Linux's sys_statfs reports these
272 * fields in units of f_bsize.
274 buf
->f_bsize
= dentry
->d_sb
->s_blocksize
;
275 blockbits
= dentry
->d_sb
->s_blocksize_bits
;
276 blockres
= (1 << blockbits
) - 1;
277 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
278 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
279 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
281 buf
->f_files
= res
.tfiles
;
282 buf
->f_ffree
= res
.afiles
;
284 buf
->f_namelen
= server
->namelen
;
290 dprintk("%s: statfs error = %d\n", __FUNCTION__
, -error
);
291 buf
->f_bsize
= buf
->f_blocks
= buf
->f_bfree
= buf
->f_bavail
= -1;
297 * Map the security flavour number to a name
299 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
301 static const struct {
302 rpc_authflavor_t flavour
;
305 { RPC_AUTH_NULL
, "null" },
306 { RPC_AUTH_UNIX
, "sys" },
307 { RPC_AUTH_GSS_KRB5
, "krb5" },
308 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
309 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
310 { RPC_AUTH_GSS_LKEY
, "lkey" },
311 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
312 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
313 { RPC_AUTH_GSS_SPKM
, "spkm" },
314 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
315 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
320 for (i
=0; sec_flavours
[i
].flavour
!= -1; i
++) {
321 if (sec_flavours
[i
].flavour
== flavour
)
324 return sec_flavours
[i
].str
;
328 * Describe the mount options in force on this server representation
330 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
, int showdefaults
)
332 static const struct proc_nfs_info
{
337 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
338 { NFS_MOUNT_INTR
, ",intr", "" },
339 { NFS_MOUNT_NOCTO
, ",nocto", "" },
340 { NFS_MOUNT_NOAC
, ",noac", "" },
341 { NFS_MOUNT_NONLM
, ",nolock", "" },
342 { NFS_MOUNT_NOACL
, ",noacl", "" },
345 const struct proc_nfs_info
*nfs_infop
;
349 seq_printf(m
, ",vers=%d", nfss
->rpc_ops
->version
);
350 seq_printf(m
, ",rsize=%d", nfss
->rsize
);
351 seq_printf(m
, ",wsize=%d", nfss
->wsize
);
352 if (nfss
->acregmin
!= 3*HZ
|| showdefaults
)
353 seq_printf(m
, ",acregmin=%d", nfss
->acregmin
/HZ
);
354 if (nfss
->acregmax
!= 60*HZ
|| showdefaults
)
355 seq_printf(m
, ",acregmax=%d", nfss
->acregmax
/HZ
);
356 if (nfss
->acdirmin
!= 30*HZ
|| showdefaults
)
357 seq_printf(m
, ",acdirmin=%d", nfss
->acdirmin
/HZ
);
358 if (nfss
->acdirmax
!= 60*HZ
|| showdefaults
)
359 seq_printf(m
, ",acdirmax=%d", nfss
->acdirmax
/HZ
);
360 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
361 if (nfss
->flags
& nfs_infop
->flag
)
362 seq_puts(m
, nfs_infop
->str
);
364 seq_puts(m
, nfs_infop
->nostr
);
366 switch (nfss
->client
->cl_xprt
->prot
) {
374 snprintf(buf
, sizeof(buf
), "%u", nfss
->client
->cl_xprt
->prot
);
377 seq_printf(m
, ",proto=%s", proto
);
378 seq_printf(m
, ",timeo=%lu", 10U * nfss
->retrans_timeo
/ HZ
);
379 seq_printf(m
, ",retrans=%u", nfss
->retrans_count
);
380 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
384 * Describe the mount options on this VFS mountpoint
386 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
388 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
390 nfs_show_mount_options(m
, nfss
, 0);
392 seq_puts(m
, ",addr=");
393 seq_escape(m
, nfss
->hostname
, " \t\n\\");
399 * Present statistical information for this VFS mountpoint
401 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
404 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
405 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
406 struct nfs_iostats totals
= { };
408 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
411 * Display all mount option settings
413 seq_printf(m
, "\n\topts:\t");
414 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
415 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
416 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
417 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
418 nfs_show_mount_options(m
, nfss
, 1);
420 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
422 seq_printf(m
, "\n\tcaps:\t");
423 seq_printf(m
, "caps=0x%x", nfss
->caps
);
424 seq_printf(m
, ",wtmult=%d", nfss
->wtmult
);
425 seq_printf(m
, ",dtsize=%d", nfss
->dtsize
);
426 seq_printf(m
, ",bsize=%d", nfss
->bsize
);
427 seq_printf(m
, ",namelen=%d", nfss
->namelen
);
430 if (nfss
->rpc_ops
->version
== 4) {
431 seq_printf(m
, "\n\tnfsv4:\t");
432 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
433 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
434 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
439 * Display security flavor in effect for this mount
441 seq_printf(m
, "\n\tsec:\tflavor=%d", auth
->au_ops
->au_flavor
);
443 seq_printf(m
, ",pseudoflavor=%d", auth
->au_flavor
);
446 * Display superblock I/O counters
448 for_each_possible_cpu(cpu
) {
449 struct nfs_iostats
*stats
;
452 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
454 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
455 totals
.events
[i
] += stats
->events
[i
];
456 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
457 totals
.bytes
[i
] += stats
->bytes
[i
];
462 seq_printf(m
, "\n\tevents:\t");
463 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
464 seq_printf(m
, "%lu ", totals
.events
[i
]);
465 seq_printf(m
, "\n\tbytes:\t");
466 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
467 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
470 rpc_print_iostats(m
, nfss
->client
);
476 * Begin unmount by attempting to remove all automounted mountpoints we added
477 * in response to traversals
479 static void nfs_umount_begin(struct vfsmount
*vfsmnt
, int flags
)
481 struct nfs_server
*server
;
482 struct rpc_clnt
*rpc
;
484 shrink_submounts(vfsmnt
, &nfs_automount_list
);
485 if (!(flags
& MNT_FORCE
))
487 /* -EIO all pending I/O */
488 server
= NFS_SB(vfsmnt
->mnt_sb
);
489 rpc
= server
->client
;
491 rpc_killall_tasks(rpc
);
492 rpc
= server
->client_acl
;
494 rpc_killall_tasks(rpc
);
498 * Obtain the root inode of the file system.
500 static struct inode
*
501 nfs_get_root(struct super_block
*sb
, struct nfs_fh
*rootfh
, struct nfs_fsinfo
*fsinfo
)
503 struct nfs_server
*server
= NFS_SB(sb
);
506 error
= server
->rpc_ops
->getroot(server
, rootfh
, fsinfo
);
508 dprintk("nfs_get_root: getattr error = %d\n", -error
);
509 return ERR_PTR(error
);
512 server
->fsid
= fsinfo
->fattr
->fsid
;
513 return nfs_fhget(sb
, rootfh
, fsinfo
->fattr
);
517 * Do NFS version-independent mount processing, and sanity checking
520 nfs_sb_init(struct super_block
*sb
, rpc_authflavor_t authflavor
)
522 struct nfs_server
*server
;
523 struct inode
*root_inode
;
524 struct nfs_fattr fattr
;
525 struct nfs_fsinfo fsinfo
= {
528 struct nfs_pathconf pathinfo
= {
531 int no_root_error
= 0;
532 unsigned long max_rpc_payload
;
534 /* We probably want something more informative here */
535 snprintf(sb
->s_id
, sizeof(sb
->s_id
), "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
539 sb
->s_magic
= NFS_SUPER_MAGIC
;
541 server
->io_stats
= nfs_alloc_iostats();
542 if (server
->io_stats
== NULL
)
545 root_inode
= nfs_get_root(sb
, &server
->fh
, &fsinfo
);
546 /* Did getting the root inode fail? */
547 if (IS_ERR(root_inode
)) {
548 no_root_error
= PTR_ERR(root_inode
);
551 sb
->s_root
= d_alloc_root(root_inode
);
553 no_root_error
= -ENOMEM
;
556 sb
->s_root
->d_op
= server
->rpc_ops
->dentry_ops
;
558 /* mount time stamp, in seconds */
559 server
->mount_time
= jiffies
;
561 /* Get some general file system info */
562 if (server
->namelen
== 0 &&
563 server
->rpc_ops
->pathconf(server
, &server
->fh
, &pathinfo
) >= 0)
564 server
->namelen
= pathinfo
.max_namelen
;
565 /* Work out a lot of parameters */
566 if (server
->rsize
== 0)
567 server
->rsize
= nfs_block_size(fsinfo
.rtpref
, NULL
);
568 if (server
->wsize
== 0)
569 server
->wsize
= nfs_block_size(fsinfo
.wtpref
, NULL
);
571 if (fsinfo
.rtmax
>= 512 && server
->rsize
> fsinfo
.rtmax
)
572 server
->rsize
= nfs_block_size(fsinfo
.rtmax
, NULL
);
573 if (fsinfo
.wtmax
>= 512 && server
->wsize
> fsinfo
.wtmax
)
574 server
->wsize
= nfs_block_size(fsinfo
.wtmax
, NULL
);
576 max_rpc_payload
= nfs_block_size(rpc_max_payload(server
->client
), NULL
);
577 if (server
->rsize
> max_rpc_payload
)
578 server
->rsize
= max_rpc_payload
;
579 if (server
->rsize
> NFS_MAX_FILE_IO_SIZE
)
580 server
->rsize
= NFS_MAX_FILE_IO_SIZE
;
581 server
->rpages
= (server
->rsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
583 if (server
->wsize
> max_rpc_payload
)
584 server
->wsize
= max_rpc_payload
;
585 if (server
->wsize
> NFS_MAX_FILE_IO_SIZE
)
586 server
->wsize
= NFS_MAX_FILE_IO_SIZE
;
587 server
->wpages
= (server
->wsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
589 if (sb
->s_blocksize
== 0)
590 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
591 &sb
->s_blocksize_bits
);
592 server
->wtmult
= nfs_block_bits(fsinfo
.wtmult
, NULL
);
594 server
->dtsize
= nfs_block_size(fsinfo
.dtpref
, NULL
);
595 if (server
->dtsize
> PAGE_CACHE_SIZE
)
596 server
->dtsize
= PAGE_CACHE_SIZE
;
597 if (server
->dtsize
> server
->rsize
)
598 server
->dtsize
= server
->rsize
;
600 if (server
->flags
& NFS_MOUNT_NOAC
) {
601 server
->acregmin
= server
->acregmax
= 0;
602 server
->acdirmin
= server
->acdirmax
= 0;
603 sb
->s_flags
|= MS_SYNCHRONOUS
;
605 server
->backing_dev_info
.ra_pages
= server
->rpages
* NFS_MAX_READAHEAD
;
607 nfs_super_set_maxbytes(sb
, fsinfo
.maxfilesize
);
609 server
->client
->cl_intr
= (server
->flags
& NFS_MOUNT_INTR
) ? 1 : 0;
610 server
->client
->cl_softrtry
= (server
->flags
& NFS_MOUNT_SOFT
) ? 1 : 0;
612 /* We're airborne Set socket buffersize */
613 rpc_setbufsize(server
->client
, server
->wsize
+ 100, server
->rsize
+ 100);
615 /* Yargs. It didn't work out. */
617 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error
);
618 if (!IS_ERR(root_inode
))
620 return no_root_error
;
624 * Initialise the timeout values for a connection
626 static void nfs_init_timeout_values(struct rpc_timeout
*to
, int proto
, unsigned int timeo
, unsigned int retrans
)
628 to
->to_initval
= timeo
* HZ
/ 10;
629 to
->to_retries
= retrans
;
636 to
->to_initval
= 60 * HZ
;
637 if (to
->to_initval
> NFS_MAX_TCP_TIMEOUT
)
638 to
->to_initval
= NFS_MAX_TCP_TIMEOUT
;
639 to
->to_increment
= to
->to_initval
;
640 to
->to_maxval
= to
->to_initval
+ (to
->to_increment
* to
->to_retries
);
641 to
->to_exponential
= 0;
646 to
->to_initval
= 11 * HZ
/ 10;
647 if (to
->to_initval
> NFS_MAX_UDP_TIMEOUT
)
648 to
->to_initval
= NFS_MAX_UDP_TIMEOUT
;
649 to
->to_maxval
= NFS_MAX_UDP_TIMEOUT
;
650 to
->to_exponential
= 1;
656 * Create an RPC client handle.
658 static struct rpc_clnt
*
659 nfs_create_client(struct nfs_server
*server
, const struct nfs_mount_data
*data
)
661 struct rpc_timeout timeparms
;
662 struct rpc_xprt
*xprt
= NULL
;
663 struct rpc_clnt
*clnt
= NULL
;
664 int proto
= (data
->flags
& NFS_MOUNT_TCP
) ? IPPROTO_TCP
: IPPROTO_UDP
;
666 nfs_init_timeout_values(&timeparms
, proto
, data
->timeo
, data
->retrans
);
668 server
->retrans_timeo
= timeparms
.to_initval
;
669 server
->retrans_count
= timeparms
.to_retries
;
671 /* create transport and client */
672 xprt
= xprt_create_proto(proto
, &server
->addr
, &timeparms
);
674 dprintk("%s: cannot create RPC transport. Error = %ld\n",
675 __FUNCTION__
, PTR_ERR(xprt
));
676 return (struct rpc_clnt
*)xprt
;
678 clnt
= rpc_create_client(xprt
, server
->hostname
, &nfs_program
,
679 server
->rpc_ops
->version
, data
->pseudoflavor
);
681 dprintk("%s: cannot create RPC client. Error = %ld\n",
682 __FUNCTION__
, PTR_ERR(xprt
));
687 clnt
->cl_softrtry
= 1;
696 * Clone a server record
698 static struct nfs_server
*nfs_clone_server(struct super_block
*sb
, struct nfs_clone_mount
*data
)
700 struct nfs_server
*server
= NFS_SB(sb
);
701 struct nfs_server
*parent
= NFS_SB(data
->sb
);
702 struct inode
*root_inode
;
703 struct nfs_fsinfo fsinfo
;
704 void *err
= ERR_PTR(-ENOMEM
);
706 sb
->s_op
= data
->sb
->s_op
;
707 sb
->s_blocksize
= data
->sb
->s_blocksize
;
708 sb
->s_blocksize_bits
= data
->sb
->s_blocksize_bits
;
709 sb
->s_maxbytes
= data
->sb
->s_maxbytes
;
711 server
->client_sys
= server
->client_acl
= ERR_PTR(-EINVAL
);
712 server
->io_stats
= nfs_alloc_iostats();
713 if (server
->io_stats
== NULL
)
716 server
->client
= rpc_clone_client(parent
->client
);
717 if (IS_ERR((err
= server
->client
)))
720 if (!IS_ERR(parent
->client_sys
)) {
721 server
->client_sys
= rpc_clone_client(parent
->client_sys
);
722 if (IS_ERR((err
= server
->client_sys
)))
725 if (!IS_ERR(parent
->client_acl
)) {
726 server
->client_acl
= rpc_clone_client(parent
->client_acl
);
727 if (IS_ERR((err
= server
->client_acl
)))
730 root_inode
= nfs_fhget(sb
, data
->fh
, data
->fattr
);
733 sb
->s_root
= d_alloc_root(root_inode
);
736 fsinfo
.fattr
= data
->fattr
;
737 if (NFS_PROTO(root_inode
)->fsinfo(server
, data
->fh
, &fsinfo
) == 0)
738 nfs_super_set_maxbytes(sb
, fsinfo
.maxfilesize
);
739 sb
->s_root
->d_op
= server
->rpc_ops
->dentry_ops
;
740 sb
->s_flags
|= MS_ACTIVE
;
749 * Copy an existing superblock and attach revised data
751 static int nfs_clone_generic_sb(struct nfs_clone_mount
*data
,
752 struct super_block
*(*fill_sb
)(struct nfs_server
*, struct nfs_clone_mount
*),
753 struct nfs_server
*(*fill_server
)(struct super_block
*, struct nfs_clone_mount
*),
754 struct vfsmount
*mnt
)
756 struct nfs_server
*server
;
757 struct nfs_server
*parent
= NFS_SB(data
->sb
);
758 struct super_block
*sb
= ERR_PTR(-EINVAL
);
763 server
= kmalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
766 memcpy(server
, parent
, sizeof(*server
));
767 hostname
= (data
->hostname
!= NULL
) ? data
->hostname
: parent
->hostname
;
768 len
= strlen(hostname
) + 1;
769 server
->hostname
= kmalloc(len
, GFP_KERNEL
);
770 if (server
->hostname
== NULL
)
772 memcpy(server
->hostname
, hostname
, len
);
777 sb
= fill_sb(server
, data
);
784 goto out_rpciod_down
;
786 server
= fill_server(sb
, data
);
787 if (IS_ERR(server
)) {
788 error
= PTR_ERR(server
);
791 return simple_set_mnt(mnt
, sb
);
793 up_write(&sb
->s_umount
);
794 deactivate_super(sb
);
798 kfree(server
->hostname
);
800 return simple_set_mnt(mnt
, sb
);
804 kfree(server
->hostname
);
812 * Set up an NFS2/3 superblock
814 * The way this works is that the mount process passes a structure
815 * in the data argument which contains the server's IP address
816 * and the root file handle obtained from the server's mount
817 * daemon. We stash these away in the private superblock fields.
820 nfs_fill_super(struct super_block
*sb
, struct nfs_mount_data
*data
, int silent
)
822 struct nfs_server
*server
;
823 rpc_authflavor_t authflavor
;
826 sb
->s_blocksize_bits
= 0;
829 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
831 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
833 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
834 server
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
836 server
->acregmin
= data
->acregmin
*HZ
;
837 server
->acregmax
= data
->acregmax
*HZ
;
838 server
->acdirmin
= data
->acdirmin
*HZ
;
839 server
->acdirmax
= data
->acdirmax
*HZ
;
841 /* Start lockd here, before we might error out */
842 if (!(server
->flags
& NFS_MOUNT_NONLM
))
845 server
->namelen
= data
->namlen
;
846 server
->hostname
= kmalloc(strlen(data
->hostname
) + 1, GFP_KERNEL
);
847 if (!server
->hostname
)
849 strcpy(server
->hostname
, data
->hostname
);
851 /* Check NFS protocol revision and initialize RPC op vector
852 * and file handle pool. */
854 if (server
->flags
& NFS_MOUNT_VER3
) {
855 server
->rpc_ops
= &nfs_v3_clientops
;
856 server
->caps
|= NFS_CAP_READDIRPLUS
;
858 server
->rpc_ops
= &nfs_v2_clientops
;
861 server
->rpc_ops
= &nfs_v2_clientops
;
864 /* Fill in pseudoflavor for mount version < 5 */
865 if (!(data
->flags
& NFS_MOUNT_SECFLAVOUR
))
866 data
->pseudoflavor
= RPC_AUTH_UNIX
;
867 authflavor
= data
->pseudoflavor
; /* save for sb_init() */
868 /* XXX maybe we want to add a server->pseudoflavor field */
870 /* Create RPC client handles */
871 server
->client
= nfs_create_client(server
, data
);
872 if (IS_ERR(server
->client
))
873 return PTR_ERR(server
->client
);
874 /* RFC 2623, sec 2.3.2 */
875 if (authflavor
!= RPC_AUTH_UNIX
) {
876 struct rpc_auth
*auth
;
878 server
->client_sys
= rpc_clone_client(server
->client
);
879 if (IS_ERR(server
->client_sys
))
880 return PTR_ERR(server
->client_sys
);
881 auth
= rpcauth_create(RPC_AUTH_UNIX
, server
->client_sys
);
883 return PTR_ERR(auth
);
885 atomic_inc(&server
->client
->cl_count
);
886 server
->client_sys
= server
->client
;
888 if (server
->flags
& NFS_MOUNT_VER3
) {
889 #ifdef CONFIG_NFS_V3_ACL
890 if (!(server
->flags
& NFS_MOUNT_NOACL
)) {
891 server
->client_acl
= rpc_bind_new_program(server
->client
, &nfsacl_program
, 3);
892 /* No errors! Assume that Sun nfsacls are supported */
893 if (!IS_ERR(server
->client_acl
))
894 server
->caps
|= NFS_CAP_ACLS
;
897 server
->flags
&= ~NFS_MOUNT_NOACL
;
898 #endif /* CONFIG_NFS_V3_ACL */
900 * The VFS shouldn't apply the umask to mode bits. We will
901 * do so ourselves when necessary.
903 sb
->s_flags
|= MS_POSIXACL
;
904 if (server
->namelen
== 0 || server
->namelen
> NFS3_MAXNAMLEN
)
905 server
->namelen
= NFS3_MAXNAMLEN
;
908 if (server
->namelen
== 0 || server
->namelen
> NFS2_MAXNAMLEN
)
909 server
->namelen
= NFS2_MAXNAMLEN
;
912 sb
->s_op
= &nfs_sops
;
913 return nfs_sb_init(sb
, authflavor
);
916 static int nfs_set_super(struct super_block
*s
, void *data
)
919 return set_anon_super(s
, data
);
922 static int nfs_compare_super(struct super_block
*sb
, void *data
)
924 struct nfs_server
*server
= data
;
925 struct nfs_server
*old
= NFS_SB(sb
);
927 if (old
->addr
.sin_addr
.s_addr
!= server
->addr
.sin_addr
.s_addr
)
929 if (old
->addr
.sin_port
!= server
->addr
.sin_port
)
931 return !nfs_compare_fh(&old
->fh
, &server
->fh
);
934 static int nfs_get_sb(struct file_system_type
*fs_type
,
935 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
938 struct nfs_server
*server
= NULL
;
939 struct super_block
*s
;
941 struct nfs_mount_data
*data
= raw_data
;
945 dprintk("%s: missing data argument\n", __FUNCTION__
);
946 goto out_err_noserver
;
948 if (data
->version
<= 0 || data
->version
> NFS_MOUNT_VERSION
) {
949 dprintk("%s: bad mount version\n", __FUNCTION__
);
950 goto out_err_noserver
;
952 switch (data
->version
) {
958 if (data
->flags
& NFS_MOUNT_VER3
) {
959 dprintk("%s: mount structure version %d does not support NFSv3\n",
962 goto out_err_noserver
;
964 data
->root
.size
= NFS2_FHSIZE
;
965 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
967 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
) {
968 dprintk("%s: mount structure version %d does not support strong security\n",
971 goto out_err_noserver
;
974 memset(data
->context
, 0, sizeof(data
->context
));
976 #ifndef CONFIG_NFS_V3
977 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
978 error
= -EPROTONOSUPPORT
;
979 if (data
->flags
& NFS_MOUNT_VER3
) {
980 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__
);
981 goto out_err_noserver
;
983 #endif /* CONFIG_NFS_V3 */
986 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
988 goto out_err_noserver
;
989 /* Zero out the NFS state stuff */
990 init_nfsv4_state(server
);
991 server
->client
= server
->client_sys
= server
->client_acl
= ERR_PTR(-EINVAL
);
994 if (data
->flags
& NFS_MOUNT_VER3
)
995 root
->size
= data
->root
.size
;
997 root
->size
= NFS2_FHSIZE
;
999 if (root
->size
> sizeof(root
->data
)) {
1000 dprintk("%s: invalid root filehandle\n", __FUNCTION__
);
1003 memcpy(root
->data
, data
->root
.data
, root
->size
);
1005 /* We now require that the mount process passes the remote address */
1006 memcpy(&server
->addr
, &data
->addr
, sizeof(server
->addr
));
1007 if (server
->addr
.sin_addr
.s_addr
== INADDR_ANY
) {
1008 dprintk("%s: mount program didn't pass remote address!\n",
1013 /* Fire up rpciod if not yet running */
1014 error
= rpciod_up();
1016 dprintk("%s: couldn't start rpciod! Error = %d\n",
1017 __FUNCTION__
, error
);
1021 s
= sget(fs_type
, nfs_compare_super
, nfs_set_super
, server
);
1024 goto out_err_rpciod
;
1028 goto out_rpciod_down
;
1032 error
= nfs_fill_super(s
, data
, flags
& MS_SILENT
? 1 : 0);
1034 up_write(&s
->s_umount
);
1035 deactivate_super(s
);
1038 s
->s_flags
|= MS_ACTIVE
;
1039 return simple_set_mnt(mnt
, s
);
1044 return simple_set_mnt(mnt
, s
);
1054 static void nfs_kill_super(struct super_block
*s
)
1056 struct nfs_server
*server
= NFS_SB(s
);
1060 if (!IS_ERR(server
->client
))
1061 rpc_shutdown_client(server
->client
);
1062 if (!IS_ERR(server
->client_sys
))
1063 rpc_shutdown_client(server
->client_sys
);
1064 if (!IS_ERR(server
->client_acl
))
1065 rpc_shutdown_client(server
->client_acl
);
1067 if (!(server
->flags
& NFS_MOUNT_NONLM
))
1068 lockd_down(); /* release rpc.lockd */
1070 rpciod_down(); /* release rpciod */
1072 nfs_free_iostats(server
->io_stats
);
1073 kfree(server
->hostname
);
1075 nfs_release_automount_timer();
1078 static struct super_block
*nfs_clone_sb(struct nfs_server
*server
, struct nfs_clone_mount
*data
)
1080 struct super_block
*sb
;
1082 server
->fsid
= data
->fattr
->fsid
;
1083 nfs_copy_fh(&server
->fh
, data
->fh
);
1084 sb
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
1085 if (!IS_ERR(sb
) && sb
->s_root
== NULL
&& !(server
->flags
& NFS_MOUNT_NONLM
))
1090 static int nfs_clone_nfs_sb(struct file_system_type
*fs_type
,
1091 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1093 struct nfs_clone_mount
*data
= raw_data
;
1094 return nfs_clone_generic_sb(data
, nfs_clone_sb
, nfs_clone_server
, mnt
);
1097 #ifdef CONFIG_NFS_V4
1098 static struct rpc_clnt
*nfs4_create_client(struct nfs_server
*server
,
1099 struct rpc_timeout
*timeparms
, int proto
, rpc_authflavor_t flavor
)
1101 struct nfs_client
*clp
;
1102 struct rpc_xprt
*xprt
= NULL
;
1103 struct rpc_clnt
*clnt
= NULL
;
1106 clp
= nfs_get_client(server
->hostname
, &server
->addr
, 4);
1108 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__
);
1109 return ERR_PTR(err
);
1112 /* Now create transport and client */
1113 if (clp
->cl_cons_state
== NFS_CS_INITING
) {
1114 xprt
= xprt_create_proto(proto
, &server
->addr
, timeparms
);
1116 err
= PTR_ERR(xprt
);
1117 dprintk("%s: cannot create RPC transport. Error = %d\n",
1119 goto client_init_error
;
1121 /* Bind to a reserved port! */
1123 clnt
= rpc_create_client(xprt
, server
->hostname
, &nfs_program
,
1124 server
->rpc_ops
->version
, flavor
);
1126 err
= PTR_ERR(clnt
);
1127 dprintk("%s: cannot create RPC client. Error = %d\n",
1129 goto client_init_error
;
1132 clnt
->cl_softrtry
= 1;
1133 clp
->cl_rpcclient
= clnt
;
1134 memcpy(clp
->cl_ipaddr
, server
->ip_addr
, sizeof(clp
->cl_ipaddr
));
1135 err
= nfs_idmap_new(clp
);
1137 dprintk("%s: failed to create idmapper.\n",
1139 goto client_init_error
;
1141 __set_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
);
1142 nfs_mark_client_ready(clp
, 0);
1145 clnt
= rpc_clone_client(clp
->cl_rpcclient
);
1148 dprintk("%s: cannot create RPC client. Error = %d\n",
1153 if (clnt
->cl_auth
->au_flavor
!= flavor
) {
1154 struct rpc_auth
*auth
;
1156 auth
= rpcauth_create(flavor
, clnt
);
1158 dprintk("%s: couldn't create credcache!\n", __FUNCTION__
);
1159 return (struct rpc_clnt
*)auth
;
1163 server
->nfs_client
= clp
;
1164 down_write(&clp
->cl_sem
);
1165 list_add_tail(&server
->nfs4_siblings
, &clp
->cl_superblocks
);
1166 up_write(&clp
->cl_sem
);
1170 nfs_mark_client_ready(clp
, err
);
1171 nfs_put_client(clp
);
1172 return ERR_PTR(err
);
1176 * Set up an NFS4 superblock
1178 static int nfs4_fill_super(struct super_block
*sb
, struct nfs4_mount_data
*data
, int silent
)
1180 struct nfs_server
*server
;
1181 struct rpc_timeout timeparms
;
1182 rpc_authflavor_t authflavour
;
1185 sb
->s_blocksize_bits
= 0;
1186 sb
->s_blocksize
= 0;
1187 server
= NFS_SB(sb
);
1188 if (data
->rsize
!= 0)
1189 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
1190 if (data
->wsize
!= 0)
1191 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
1192 server
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1193 server
->caps
= NFS_CAP_ATOMIC_OPEN
;
1195 server
->acregmin
= data
->acregmin
*HZ
;
1196 server
->acregmax
= data
->acregmax
*HZ
;
1197 server
->acdirmin
= data
->acdirmin
*HZ
;
1198 server
->acdirmax
= data
->acdirmax
*HZ
;
1200 server
->rpc_ops
= &nfs_v4_clientops
;
1202 nfs_init_timeout_values(&timeparms
, data
->proto
, data
->timeo
, data
->retrans
);
1204 server
->retrans_timeo
= timeparms
.to_initval
;
1205 server
->retrans_count
= timeparms
.to_retries
;
1207 /* Now create transport and client */
1208 authflavour
= RPC_AUTH_UNIX
;
1209 if (data
->auth_flavourlen
!= 0) {
1210 if (data
->auth_flavourlen
!= 1) {
1211 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1212 __FUNCTION__
, data
->auth_flavourlen
);
1216 if (copy_from_user(&authflavour
, data
->auth_flavours
, sizeof(authflavour
))) {
1222 server
->client
= nfs4_create_client(server
, &timeparms
, data
->proto
, authflavour
);
1223 if (IS_ERR(server
->client
)) {
1224 err
= PTR_ERR(server
->client
);
1225 dprintk("%s: cannot create RPC client. Error = %d\n",
1230 sb
->s_time_gran
= 1;
1232 sb
->s_op
= &nfs4_sops
;
1233 err
= nfs_sb_init(sb
, authflavour
);
1239 static int nfs4_compare_super(struct super_block
*sb
, void *data
)
1241 struct nfs_server
*server
= data
;
1242 struct nfs_server
*old
= NFS_SB(sb
);
1244 if (strcmp(server
->hostname
, old
->hostname
) != 0)
1246 if (strcmp(server
->mnt_path
, old
->mnt_path
) != 0)
1252 nfs_copy_user_string(char *dst
, struct nfs_string
*src
, int maxlen
)
1257 return ERR_PTR(-EINVAL
);
1258 if (src
->len
< maxlen
)
1261 p
= dst
= kmalloc(maxlen
+ 1, GFP_KERNEL
);
1263 return ERR_PTR(-ENOMEM
);
1265 if (copy_from_user(dst
, src
->data
, maxlen
)) {
1267 return ERR_PTR(-EFAULT
);
1273 static int nfs4_get_sb(struct file_system_type
*fs_type
,
1274 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1277 struct nfs_server
*server
;
1278 struct super_block
*s
;
1279 struct nfs4_mount_data
*data
= raw_data
;
1283 dprintk("%s: missing data argument\n", __FUNCTION__
);
1286 if (data
->version
<= 0 || data
->version
> NFS4_MOUNT_VERSION
) {
1287 dprintk("%s: bad mount version\n", __FUNCTION__
);
1291 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
1294 /* Zero out the NFS state stuff */
1295 init_nfsv4_state(server
);
1296 server
->client
= server
->client_sys
= server
->client_acl
= ERR_PTR(-EINVAL
);
1298 p
= nfs_copy_user_string(NULL
, &data
->hostname
, 256);
1301 server
->hostname
= p
;
1303 p
= nfs_copy_user_string(NULL
, &data
->mnt_path
, 1024);
1306 server
->mnt_path
= p
;
1308 p
= nfs_copy_user_string(server
->ip_addr
, &data
->client_addr
,
1309 sizeof(server
->ip_addr
) - 1);
1313 /* We now require that the mount process passes the remote address */
1314 if (data
->host_addrlen
!= sizeof(server
->addr
)) {
1318 if (copy_from_user(&server
->addr
, data
->host_addr
, sizeof(server
->addr
))) {
1322 if (server
->addr
.sin_family
!= AF_INET
||
1323 server
->addr
.sin_addr
.s_addr
== INADDR_ANY
) {
1324 dprintk("%s: mount program didn't pass remote IP address!\n",
1330 s
= sget(fs_type
, nfs4_compare_super
, nfs_set_super
, server
);
1337 kfree(server
->mnt_path
);
1338 kfree(server
->hostname
);
1340 return simple_set_mnt(mnt
, s
);
1345 error
= nfs4_fill_super(s
, data
, flags
& MS_SILENT
? 1 : 0);
1347 up_write(&s
->s_umount
);
1348 deactivate_super(s
);
1351 s
->s_flags
|= MS_ACTIVE
;
1352 return simple_set_mnt(mnt
, s
);
1356 kfree(server
->mnt_path
);
1357 kfree(server
->hostname
);
1362 static void nfs4_kill_super(struct super_block
*sb
)
1364 struct nfs_server
*server
= NFS_SB(sb
);
1366 nfs_return_all_delegations(sb
);
1367 kill_anon_super(sb
);
1369 nfs4_renewd_prepare_shutdown(server
);
1371 if (server
->client
!= NULL
&& !IS_ERR(server
->client
))
1372 rpc_shutdown_client(server
->client
);
1374 destroy_nfsv4_state(server
);
1376 nfs_free_iostats(server
->io_stats
);
1377 kfree(server
->hostname
);
1379 nfs_release_automount_timer();
1383 * Constructs the SERVER-side path
1385 static inline char *nfs4_dup_path(const struct dentry
*dentry
)
1387 char *page
= (char *) __get_free_page(GFP_USER
);
1390 path
= nfs4_path(dentry
, page
, PAGE_SIZE
);
1391 if (!IS_ERR(path
)) {
1392 int len
= PAGE_SIZE
+ page
- path
;
1395 path
= kmalloc(len
, GFP_KERNEL
);
1397 memcpy(path
, tmp
, len
);
1399 path
= ERR_PTR(-ENOMEM
);
1401 free_page((unsigned long)page
);
1405 static struct super_block
*nfs4_clone_sb(struct nfs_server
*server
, struct nfs_clone_mount
*data
)
1407 const struct dentry
*dentry
= data
->dentry
;
1408 struct nfs_client
*clp
= server
->nfs_client
;
1409 struct super_block
*sb
;
1411 server
->fsid
= data
->fattr
->fsid
;
1412 nfs_copy_fh(&server
->fh
, data
->fh
);
1413 server
->mnt_path
= nfs4_dup_path(dentry
);
1414 if (IS_ERR(server
->mnt_path
)) {
1415 sb
= (struct super_block
*)server
->mnt_path
;
1418 sb
= sget(&nfs4_fs_type
, nfs4_compare_super
, nfs_set_super
, server
);
1419 if (IS_ERR(sb
) || sb
->s_root
)
1421 nfs4_server_capabilities(server
, &server
->fh
);
1423 down_write(&clp
->cl_sem
);
1424 atomic_inc(&clp
->cl_count
);
1425 list_add_tail(&server
->nfs4_siblings
, &clp
->cl_superblocks
);
1426 up_write(&clp
->cl_sem
);
1429 kfree(server
->mnt_path
);
1431 server
->mnt_path
= NULL
;
1435 static int nfs_clone_nfs4_sb(struct file_system_type
*fs_type
,
1436 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1438 struct nfs_clone_mount
*data
= raw_data
;
1439 return nfs_clone_generic_sb(data
, nfs4_clone_sb
, nfs_clone_server
, mnt
);
1442 static struct super_block
*nfs4_referral_sb(struct nfs_server
*server
, struct nfs_clone_mount
*data
)
1444 struct super_block
*sb
= ERR_PTR(-ENOMEM
);
1447 len
= strlen(data
->mnt_path
) + 1;
1448 server
->mnt_path
= kmalloc(len
, GFP_KERNEL
);
1449 if (server
->mnt_path
== NULL
)
1451 memcpy(server
->mnt_path
, data
->mnt_path
, len
);
1452 memcpy(&server
->addr
, data
->addr
, sizeof(struct sockaddr_in
));
1454 sb
= sget(&nfs4_fs_type
, nfs4_compare_super
, nfs_set_super
, server
);
1455 if (IS_ERR(sb
) || sb
->s_root
)
1459 kfree(server
->mnt_path
);
1461 server
->mnt_path
= NULL
;
1465 static struct nfs_server
*nfs4_referral_server(struct super_block
*sb
, struct nfs_clone_mount
*data
)
1467 struct nfs_server
*server
= NFS_SB(sb
);
1468 struct rpc_timeout timeparms
;
1469 int proto
, timeo
, retrans
;
1472 proto
= IPPROTO_TCP
;
1473 /* Since we are following a referral and there may be alternatives,
1474 set the timeouts and retries to low values */
1477 nfs_init_timeout_values(&timeparms
, proto
, timeo
, retrans
);
1479 server
->client
= nfs4_create_client(server
, &timeparms
, proto
, data
->authflavor
);
1480 if (IS_ERR((err
= server
->client
)))
1483 sb
->s_time_gran
= 1;
1484 sb
->s_op
= &nfs4_sops
;
1485 err
= ERR_PTR(nfs_sb_init(sb
, data
->authflavor
));
1489 return (struct nfs_server
*)err
;
1492 static int nfs_referral_nfs4_sb(struct file_system_type
*fs_type
,
1493 int flags
, const char *dev_name
, void *raw_data
, struct vfsmount
*mnt
)
1495 struct nfs_clone_mount
*data
= raw_data
;
1496 return nfs_clone_generic_sb(data
, nfs4_referral_sb
, nfs4_referral_server
, mnt
);