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 super_block
*, 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 struct super_block
*nfs_get_sb(struct file_system_type
*, int, const char *, void *);
114 static struct super_block
*nfs_clone_nfs_sb(struct file_system_type
*fs_type
,
115 int flags
, const char *dev_name
, void *raw_data
);
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 struct super_block
*nfs4_get_sb(struct file_system_type
*fs_type
,
147 int flags
, const char *dev_name
, void *raw_data
);
148 static struct super_block
*nfs_clone_nfs4_sb(struct file_system_type
*fs_type
,
149 int flags
, const char *dev_name
, void *raw_data
);
150 static struct super_block
*nfs_referral_nfs4_sb(struct file_system_type
*fs_type
,
151 int flags
, const char *dev_name
, void *raw_data
);
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 const int nfs_set_port_min
= 0;
191 static const int nfs_set_port_max
= 65535;
193 static int param_set_port(const char *val
, struct kernel_param
*kp
)
196 int num
= simple_strtol(val
, &endp
, 0);
197 if (endp
== val
|| *endp
|| num
< nfs_set_port_min
|| num
> nfs_set_port_max
)
199 *((int *)kp
->arg
) = num
;
203 module_param_call(callback_tcpport
, param_set_port
, param_get_int
,
204 &nfs_callback_set_tcpport
, 0644);
206 static int param_set_idmap_timeout(const char *val
, struct kernel_param
*kp
)
209 int num
= simple_strtol(val
, &endp
, 0);
211 if (endp
== val
|| *endp
|| num
< 0 || jif
< num
)
213 *((int *)kp
->arg
) = jif
;
217 module_param_call(idmap_cache_timeout
, param_set_idmap_timeout
, param_get_int
,
218 &nfs_idmap_cache_timeout
, 0644);
221 * Register the NFS filesystems
223 int __init
register_nfs_fs(void)
227 ret
= register_filesystem(&nfs_fs_type
);
232 ret
= nfs_register_sysctl();
235 ret
= register_filesystem(&nfs4_fs_type
);
243 nfs_unregister_sysctl();
245 unregister_filesystem(&nfs_fs_type
);
252 * Unregister the NFS filesystems
254 void __exit
unregister_nfs_fs(void)
257 unregister_filesystem(&nfs4_fs_type
);
258 nfs_unregister_sysctl();
260 unregister_filesystem(&nfs_fs_type
);
264 * Deliver file system statistics to userspace
266 static int nfs_statfs(struct super_block
*sb
, struct kstatfs
*buf
)
268 struct nfs_server
*server
= NFS_SB(sb
);
269 unsigned char blockbits
;
270 unsigned long blockres
;
271 struct nfs_fh
*rootfh
= NFS_FH(sb
->s_root
->d_inode
);
272 struct nfs_fattr fattr
;
273 struct nfs_fsstat res
= {
280 error
= server
->rpc_ops
->statfs(server
, rootfh
, &res
);
281 buf
->f_type
= NFS_SUPER_MAGIC
;
286 * Current versions of glibc do not correctly handle the
287 * case where f_frsize != f_bsize. Eventually we want to
288 * report the value of wtmult in this field.
290 buf
->f_frsize
= sb
->s_blocksize
;
293 * On most *nix systems, f_blocks, f_bfree, and f_bavail
294 * are reported in units of f_frsize. Linux hasn't had
295 * an f_frsize field in its statfs struct until recently,
296 * thus historically Linux's sys_statfs reports these
297 * fields in units of f_bsize.
299 buf
->f_bsize
= sb
->s_blocksize
;
300 blockbits
= sb
->s_blocksize_bits
;
301 blockres
= (1 << blockbits
) - 1;
302 buf
->f_blocks
= (res
.tbytes
+ blockres
) >> blockbits
;
303 buf
->f_bfree
= (res
.fbytes
+ blockres
) >> blockbits
;
304 buf
->f_bavail
= (res
.abytes
+ blockres
) >> blockbits
;
306 buf
->f_files
= res
.tfiles
;
307 buf
->f_ffree
= res
.afiles
;
309 buf
->f_namelen
= server
->namelen
;
315 dprintk("%s: statfs error = %d\n", __FUNCTION__
, -error
);
316 buf
->f_bsize
= buf
->f_blocks
= buf
->f_bfree
= buf
->f_bavail
= -1;
321 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour
)
324 rpc_authflavor_t flavour
;
327 { RPC_AUTH_NULL
, "null" },
328 { RPC_AUTH_UNIX
, "sys" },
329 { RPC_AUTH_GSS_KRB5
, "krb5" },
330 { RPC_AUTH_GSS_KRB5I
, "krb5i" },
331 { RPC_AUTH_GSS_KRB5P
, "krb5p" },
332 { RPC_AUTH_GSS_LKEY
, "lkey" },
333 { RPC_AUTH_GSS_LKEYI
, "lkeyi" },
334 { RPC_AUTH_GSS_LKEYP
, "lkeyp" },
335 { RPC_AUTH_GSS_SPKM
, "spkm" },
336 { RPC_AUTH_GSS_SPKMI
, "spkmi" },
337 { RPC_AUTH_GSS_SPKMP
, "spkmp" },
342 for (i
=0; sec_flavours
[i
].flavour
!= -1; i
++) {
343 if (sec_flavours
[i
].flavour
== flavour
)
346 return sec_flavours
[i
].str
;
350 * Describe the mount options in force on this server representation
352 static void nfs_show_mount_options(struct seq_file
*m
, struct nfs_server
*nfss
, int showdefaults
)
354 static struct proc_nfs_info
{
359 { NFS_MOUNT_SOFT
, ",soft", ",hard" },
360 { NFS_MOUNT_INTR
, ",intr", "" },
361 { NFS_MOUNT_NOCTO
, ",nocto", "" },
362 { NFS_MOUNT_NOAC
, ",noac", "" },
363 { NFS_MOUNT_NONLM
, ",nolock", "" },
364 { NFS_MOUNT_NOACL
, ",noacl", "" },
367 struct proc_nfs_info
*nfs_infop
;
371 seq_printf(m
, ",vers=%d", nfss
->rpc_ops
->version
);
372 seq_printf(m
, ",rsize=%d", nfss
->rsize
);
373 seq_printf(m
, ",wsize=%d", nfss
->wsize
);
374 if (nfss
->acregmin
!= 3*HZ
|| showdefaults
)
375 seq_printf(m
, ",acregmin=%d", nfss
->acregmin
/HZ
);
376 if (nfss
->acregmax
!= 60*HZ
|| showdefaults
)
377 seq_printf(m
, ",acregmax=%d", nfss
->acregmax
/HZ
);
378 if (nfss
->acdirmin
!= 30*HZ
|| showdefaults
)
379 seq_printf(m
, ",acdirmin=%d", nfss
->acdirmin
/HZ
);
380 if (nfss
->acdirmax
!= 60*HZ
|| showdefaults
)
381 seq_printf(m
, ",acdirmax=%d", nfss
->acdirmax
/HZ
);
382 for (nfs_infop
= nfs_info
; nfs_infop
->flag
; nfs_infop
++) {
383 if (nfss
->flags
& nfs_infop
->flag
)
384 seq_puts(m
, nfs_infop
->str
);
386 seq_puts(m
, nfs_infop
->nostr
);
388 switch (nfss
->client
->cl_xprt
->prot
) {
396 snprintf(buf
, sizeof(buf
), "%u", nfss
->client
->cl_xprt
->prot
);
399 seq_printf(m
, ",proto=%s", proto
);
400 seq_printf(m
, ",timeo=%lu", 10U * nfss
->retrans_timeo
/ HZ
);
401 seq_printf(m
, ",retrans=%u", nfss
->retrans_count
);
402 seq_printf(m
, ",sec=%s", nfs_pseudoflavour_to_name(nfss
->client
->cl_auth
->au_flavor
));
406 * Describe the mount options on this VFS mountpoint
408 static int nfs_show_options(struct seq_file
*m
, struct vfsmount
*mnt
)
410 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
412 nfs_show_mount_options(m
, nfss
, 0);
414 seq_puts(m
, ",addr=");
415 seq_escape(m
, nfss
->hostname
, " \t\n\\");
421 * Present statistical information for this VFS mountpoint
423 static int nfs_show_stats(struct seq_file
*m
, struct vfsmount
*mnt
)
426 struct nfs_server
*nfss
= NFS_SB(mnt
->mnt_sb
);
427 struct rpc_auth
*auth
= nfss
->client
->cl_auth
;
428 struct nfs_iostats totals
= { };
430 seq_printf(m
, "statvers=%s", NFS_IOSTAT_VERS
);
433 * Display all mount option settings
435 seq_printf(m
, "\n\topts:\t");
436 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_RDONLY
? "ro" : "rw");
437 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_SYNCHRONOUS
? ",sync" : "");
438 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NOATIME
? ",noatime" : "");
439 seq_puts(m
, mnt
->mnt_sb
->s_flags
& MS_NODIRATIME
? ",nodiratime" : "");
440 nfs_show_mount_options(m
, nfss
, 1);
442 seq_printf(m
, "\n\tage:\t%lu", (jiffies
- nfss
->mount_time
) / HZ
);
444 seq_printf(m
, "\n\tcaps:\t");
445 seq_printf(m
, "caps=0x%x", nfss
->caps
);
446 seq_printf(m
, ",wtmult=%d", nfss
->wtmult
);
447 seq_printf(m
, ",dtsize=%d", nfss
->dtsize
);
448 seq_printf(m
, ",bsize=%d", nfss
->bsize
);
449 seq_printf(m
, ",namelen=%d", nfss
->namelen
);
452 if (nfss
->rpc_ops
->version
== 4) {
453 seq_printf(m
, "\n\tnfsv4:\t");
454 seq_printf(m
, "bm0=0x%x", nfss
->attr_bitmask
[0]);
455 seq_printf(m
, ",bm1=0x%x", nfss
->attr_bitmask
[1]);
456 seq_printf(m
, ",acl=0x%x", nfss
->acl_bitmask
);
461 * Display security flavor in effect for this mount
463 seq_printf(m
, "\n\tsec:\tflavor=%d", auth
->au_ops
->au_flavor
);
465 seq_printf(m
, ",pseudoflavor=%d", auth
->au_flavor
);
468 * Display superblock I/O counters
470 for_each_possible_cpu(cpu
) {
471 struct nfs_iostats
*stats
;
474 stats
= per_cpu_ptr(nfss
->io_stats
, cpu
);
476 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
477 totals
.events
[i
] += stats
->events
[i
];
478 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
479 totals
.bytes
[i
] += stats
->bytes
[i
];
484 seq_printf(m
, "\n\tevents:\t");
485 for (i
= 0; i
< __NFSIOS_COUNTSMAX
; i
++)
486 seq_printf(m
, "%lu ", totals
.events
[i
]);
487 seq_printf(m
, "\n\tbytes:\t");
488 for (i
= 0; i
< __NFSIOS_BYTESMAX
; i
++)
489 seq_printf(m
, "%Lu ", totals
.bytes
[i
]);
492 rpc_print_iostats(m
, nfss
->client
);
498 * Begin unmount by attempting to remove all automounted mountpoints we added
499 * in response to traversals
501 static void nfs_umount_begin(struct vfsmount
*vfsmnt
, int flags
)
503 struct nfs_server
*server
;
504 struct rpc_clnt
*rpc
;
506 shrink_submounts(vfsmnt
, &nfs_automount_list
);
507 if (!(flags
& MNT_FORCE
))
509 /* -EIO all pending I/O */
510 server
= NFS_SB(vfsmnt
->mnt_sb
);
511 rpc
= server
->client
;
513 rpc_killall_tasks(rpc
);
514 rpc
= server
->client_acl
;
516 rpc_killall_tasks(rpc
);
520 * Obtain the root inode of the file system.
522 static struct inode
*
523 nfs_get_root(struct super_block
*sb
, struct nfs_fh
*rootfh
, struct nfs_fsinfo
*fsinfo
)
525 struct nfs_server
*server
= NFS_SB(sb
);
528 error
= server
->rpc_ops
->getroot(server
, rootfh
, fsinfo
);
530 dprintk("nfs_get_root: getattr error = %d\n", -error
);
531 return ERR_PTR(error
);
534 server
->fsid
= fsinfo
->fattr
->fsid
;
535 return nfs_fhget(sb
, rootfh
, fsinfo
->fattr
);
539 * Do NFS version-independent mount processing, and sanity checking
542 nfs_sb_init(struct super_block
*sb
, rpc_authflavor_t authflavor
)
544 struct nfs_server
*server
;
545 struct inode
*root_inode
;
546 struct nfs_fattr fattr
;
547 struct nfs_fsinfo fsinfo
= {
550 struct nfs_pathconf pathinfo
= {
553 int no_root_error
= 0;
554 unsigned long max_rpc_payload
;
556 /* We probably want something more informative here */
557 snprintf(sb
->s_id
, sizeof(sb
->s_id
), "%x:%x", MAJOR(sb
->s_dev
), MINOR(sb
->s_dev
));
561 sb
->s_magic
= NFS_SUPER_MAGIC
;
563 server
->io_stats
= nfs_alloc_iostats();
564 if (server
->io_stats
== NULL
)
567 root_inode
= nfs_get_root(sb
, &server
->fh
, &fsinfo
);
568 /* Did getting the root inode fail? */
569 if (IS_ERR(root_inode
)) {
570 no_root_error
= PTR_ERR(root_inode
);
573 sb
->s_root
= d_alloc_root(root_inode
);
575 no_root_error
= -ENOMEM
;
578 sb
->s_root
->d_op
= server
->rpc_ops
->dentry_ops
;
580 /* mount time stamp, in seconds */
581 server
->mount_time
= jiffies
;
583 /* Get some general file system info */
584 if (server
->namelen
== 0 &&
585 server
->rpc_ops
->pathconf(server
, &server
->fh
, &pathinfo
) >= 0)
586 server
->namelen
= pathinfo
.max_namelen
;
587 /* Work out a lot of parameters */
588 if (server
->rsize
== 0)
589 server
->rsize
= nfs_block_size(fsinfo
.rtpref
, NULL
);
590 if (server
->wsize
== 0)
591 server
->wsize
= nfs_block_size(fsinfo
.wtpref
, NULL
);
593 if (fsinfo
.rtmax
>= 512 && server
->rsize
> fsinfo
.rtmax
)
594 server
->rsize
= nfs_block_size(fsinfo
.rtmax
, NULL
);
595 if (fsinfo
.wtmax
>= 512 && server
->wsize
> fsinfo
.wtmax
)
596 server
->wsize
= nfs_block_size(fsinfo
.wtmax
, NULL
);
598 max_rpc_payload
= nfs_block_size(rpc_max_payload(server
->client
), NULL
);
599 if (server
->rsize
> max_rpc_payload
)
600 server
->rsize
= max_rpc_payload
;
601 if (server
->rsize
> NFS_MAX_FILE_IO_SIZE
)
602 server
->rsize
= NFS_MAX_FILE_IO_SIZE
;
603 server
->rpages
= (server
->rsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
605 if (server
->wsize
> max_rpc_payload
)
606 server
->wsize
= max_rpc_payload
;
607 if (server
->wsize
> NFS_MAX_FILE_IO_SIZE
)
608 server
->wsize
= NFS_MAX_FILE_IO_SIZE
;
609 server
->wpages
= (server
->wsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
611 if (sb
->s_blocksize
== 0)
612 sb
->s_blocksize
= nfs_block_bits(server
->wsize
,
613 &sb
->s_blocksize_bits
);
614 server
->wtmult
= nfs_block_bits(fsinfo
.wtmult
, NULL
);
616 server
->dtsize
= nfs_block_size(fsinfo
.dtpref
, NULL
);
617 if (server
->dtsize
> PAGE_CACHE_SIZE
)
618 server
->dtsize
= PAGE_CACHE_SIZE
;
619 if (server
->dtsize
> server
->rsize
)
620 server
->dtsize
= server
->rsize
;
622 if (server
->flags
& NFS_MOUNT_NOAC
) {
623 server
->acregmin
= server
->acregmax
= 0;
624 server
->acdirmin
= server
->acdirmax
= 0;
625 sb
->s_flags
|= MS_SYNCHRONOUS
;
627 server
->backing_dev_info
.ra_pages
= server
->rpages
* NFS_MAX_READAHEAD
;
629 nfs_super_set_maxbytes(sb
, fsinfo
.maxfilesize
);
631 server
->client
->cl_intr
= (server
->flags
& NFS_MOUNT_INTR
) ? 1 : 0;
632 server
->client
->cl_softrtry
= (server
->flags
& NFS_MOUNT_SOFT
) ? 1 : 0;
634 /* We're airborne Set socket buffersize */
635 rpc_setbufsize(server
->client
, server
->wsize
+ 100, server
->rsize
+ 100);
637 /* Yargs. It didn't work out. */
639 dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error
);
640 if (!IS_ERR(root_inode
))
642 return no_root_error
;
646 * Initialise the timeout values for a connection
648 static void nfs_init_timeout_values(struct rpc_timeout
*to
, int proto
, unsigned int timeo
, unsigned int retrans
)
650 to
->to_initval
= timeo
* HZ
/ 10;
651 to
->to_retries
= retrans
;
658 to
->to_initval
= 60 * HZ
;
659 if (to
->to_initval
> NFS_MAX_TCP_TIMEOUT
)
660 to
->to_initval
= NFS_MAX_TCP_TIMEOUT
;
661 to
->to_increment
= to
->to_initval
;
662 to
->to_maxval
= to
->to_initval
+ (to
->to_increment
* to
->to_retries
);
663 to
->to_exponential
= 0;
668 to
->to_initval
= 11 * HZ
/ 10;
669 if (to
->to_initval
> NFS_MAX_UDP_TIMEOUT
)
670 to
->to_initval
= NFS_MAX_UDP_TIMEOUT
;
671 to
->to_maxval
= NFS_MAX_UDP_TIMEOUT
;
672 to
->to_exponential
= 1;
678 * Create an RPC client handle.
680 static struct rpc_clnt
*
681 nfs_create_client(struct nfs_server
*server
, const struct nfs_mount_data
*data
)
683 struct rpc_timeout timeparms
;
684 struct rpc_xprt
*xprt
= NULL
;
685 struct rpc_clnt
*clnt
= NULL
;
686 int proto
= (data
->flags
& NFS_MOUNT_TCP
) ? IPPROTO_TCP
: IPPROTO_UDP
;
688 nfs_init_timeout_values(&timeparms
, proto
, data
->timeo
, data
->retrans
);
690 server
->retrans_timeo
= timeparms
.to_initval
;
691 server
->retrans_count
= timeparms
.to_retries
;
693 /* create transport and client */
694 xprt
= xprt_create_proto(proto
, &server
->addr
, &timeparms
);
696 dprintk("%s: cannot create RPC transport. Error = %ld\n",
697 __FUNCTION__
, PTR_ERR(xprt
));
698 return (struct rpc_clnt
*)xprt
;
700 clnt
= rpc_create_client(xprt
, server
->hostname
, &nfs_program
,
701 server
->rpc_ops
->version
, data
->pseudoflavor
);
703 dprintk("%s: cannot create RPC client. Error = %ld\n",
704 __FUNCTION__
, PTR_ERR(xprt
));
709 clnt
->cl_softrtry
= 1;
718 * Clone a server record
720 static struct nfs_server
*nfs_clone_server(struct super_block
*sb
, struct nfs_clone_mount
*data
)
722 struct nfs_server
*server
= NFS_SB(sb
);
723 struct nfs_server
*parent
= NFS_SB(data
->sb
);
724 struct inode
*root_inode
;
725 struct nfs_fsinfo fsinfo
;
726 void *err
= ERR_PTR(-ENOMEM
);
728 sb
->s_op
= data
->sb
->s_op
;
729 sb
->s_blocksize
= data
->sb
->s_blocksize
;
730 sb
->s_blocksize_bits
= data
->sb
->s_blocksize_bits
;
731 sb
->s_maxbytes
= data
->sb
->s_maxbytes
;
733 server
->client_sys
= server
->client_acl
= ERR_PTR(-EINVAL
);
734 server
->io_stats
= nfs_alloc_iostats();
735 if (server
->io_stats
== NULL
)
738 server
->client
= rpc_clone_client(parent
->client
);
739 if (IS_ERR((err
= server
->client
)))
742 if (!IS_ERR(parent
->client_sys
)) {
743 server
->client_sys
= rpc_clone_client(parent
->client_sys
);
744 if (IS_ERR((err
= server
->client_sys
)))
747 if (!IS_ERR(parent
->client_acl
)) {
748 server
->client_acl
= rpc_clone_client(parent
->client_acl
);
749 if (IS_ERR((err
= server
->client_acl
)))
752 root_inode
= nfs_fhget(sb
, data
->fh
, data
->fattr
);
755 sb
->s_root
= d_alloc_root(root_inode
);
758 fsinfo
.fattr
= data
->fattr
;
759 if (NFS_PROTO(root_inode
)->fsinfo(server
, data
->fh
, &fsinfo
) == 0)
760 nfs_super_set_maxbytes(sb
, fsinfo
.maxfilesize
);
761 sb
->s_root
->d_op
= server
->rpc_ops
->dentry_ops
;
762 sb
->s_flags
|= MS_ACTIVE
;
771 * Copy an existing superblock and attach revised data
773 static struct super_block
*nfs_clone_generic_sb(struct nfs_clone_mount
*data
,
774 struct super_block
*(*fill_sb
)(struct nfs_server
*, struct nfs_clone_mount
*),
775 struct nfs_server
*(*fill_server
)(struct super_block
*, struct nfs_clone_mount
*))
777 struct nfs_server
*server
;
778 struct nfs_server
*parent
= NFS_SB(data
->sb
);
779 struct super_block
*sb
= ERR_PTR(-EINVAL
);
780 void *err
= ERR_PTR(-ENOMEM
);
784 server
= kmalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
787 memcpy(server
, parent
, sizeof(*server
));
788 hostname
= (data
->hostname
!= NULL
) ? data
->hostname
: parent
->hostname
;
789 len
= strlen(hostname
) + 1;
790 server
->hostname
= kmalloc(len
, GFP_KERNEL
);
791 if (server
->hostname
== NULL
)
793 memcpy(server
->hostname
, hostname
, len
);
794 if (rpciod_up() != 0)
797 sb
= fill_sb(server
, data
);
798 if (IS_ERR((err
= sb
)) || sb
->s_root
)
801 server
= fill_server(sb
, data
);
802 if (IS_ERR((err
= server
)))
806 up_write(&sb
->s_umount
);
807 deactivate_super(sb
);
808 return (struct super_block
*)err
;
812 kfree(server
->hostname
);
816 return (struct super_block
*)err
;
820 * Set up an NFS2/3 superblock
822 * The way this works is that the mount process passes a structure
823 * in the data argument which contains the server's IP address
824 * and the root file handle obtained from the server's mount
825 * daemon. We stash these away in the private superblock fields.
828 nfs_fill_super(struct super_block
*sb
, struct nfs_mount_data
*data
, int silent
)
830 struct nfs_server
*server
;
831 rpc_authflavor_t authflavor
;
834 sb
->s_blocksize_bits
= 0;
837 sb
->s_blocksize
= nfs_block_size(data
->bsize
, &sb
->s_blocksize_bits
);
839 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
841 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
842 server
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
844 server
->acregmin
= data
->acregmin
*HZ
;
845 server
->acregmax
= data
->acregmax
*HZ
;
846 server
->acdirmin
= data
->acdirmin
*HZ
;
847 server
->acdirmax
= data
->acdirmax
*HZ
;
849 /* Start lockd here, before we might error out */
850 if (!(server
->flags
& NFS_MOUNT_NONLM
))
853 server
->namelen
= data
->namlen
;
854 server
->hostname
= kmalloc(strlen(data
->hostname
) + 1, GFP_KERNEL
);
855 if (!server
->hostname
)
857 strcpy(server
->hostname
, data
->hostname
);
859 /* Check NFS protocol revision and initialize RPC op vector
860 * and file handle pool. */
862 if (server
->flags
& NFS_MOUNT_VER3
) {
863 server
->rpc_ops
= &nfs_v3_clientops
;
864 server
->caps
|= NFS_CAP_READDIRPLUS
;
866 server
->rpc_ops
= &nfs_v2_clientops
;
869 server
->rpc_ops
= &nfs_v2_clientops
;
872 /* Fill in pseudoflavor for mount version < 5 */
873 if (!(data
->flags
& NFS_MOUNT_SECFLAVOUR
))
874 data
->pseudoflavor
= RPC_AUTH_UNIX
;
875 authflavor
= data
->pseudoflavor
; /* save for sb_init() */
876 /* XXX maybe we want to add a server->pseudoflavor field */
878 /* Create RPC client handles */
879 server
->client
= nfs_create_client(server
, data
);
880 if (IS_ERR(server
->client
))
881 return PTR_ERR(server
->client
);
882 /* RFC 2623, sec 2.3.2 */
883 if (authflavor
!= RPC_AUTH_UNIX
) {
884 struct rpc_auth
*auth
;
886 server
->client_sys
= rpc_clone_client(server
->client
);
887 if (IS_ERR(server
->client_sys
))
888 return PTR_ERR(server
->client_sys
);
889 auth
= rpcauth_create(RPC_AUTH_UNIX
, server
->client_sys
);
891 return PTR_ERR(auth
);
893 atomic_inc(&server
->client
->cl_count
);
894 server
->client_sys
= server
->client
;
896 if (server
->flags
& NFS_MOUNT_VER3
) {
897 #ifdef CONFIG_NFS_V3_ACL
898 if (!(server
->flags
& NFS_MOUNT_NOACL
)) {
899 server
->client_acl
= rpc_bind_new_program(server
->client
, &nfsacl_program
, 3);
900 /* No errors! Assume that Sun nfsacls are supported */
901 if (!IS_ERR(server
->client_acl
))
902 server
->caps
|= NFS_CAP_ACLS
;
905 server
->flags
&= ~NFS_MOUNT_NOACL
;
906 #endif /* CONFIG_NFS_V3_ACL */
908 * The VFS shouldn't apply the umask to mode bits. We will
909 * do so ourselves when necessary.
911 sb
->s_flags
|= MS_POSIXACL
;
912 if (server
->namelen
== 0 || server
->namelen
> NFS3_MAXNAMLEN
)
913 server
->namelen
= NFS3_MAXNAMLEN
;
916 if (server
->namelen
== 0 || server
->namelen
> NFS2_MAXNAMLEN
)
917 server
->namelen
= NFS2_MAXNAMLEN
;
920 sb
->s_op
= &nfs_sops
;
921 return nfs_sb_init(sb
, authflavor
);
924 static int nfs_set_super(struct super_block
*s
, void *data
)
927 return set_anon_super(s
, data
);
930 static int nfs_compare_super(struct super_block
*sb
, void *data
)
932 struct nfs_server
*server
= data
;
933 struct nfs_server
*old
= NFS_SB(sb
);
935 if (old
->addr
.sin_addr
.s_addr
!= server
->addr
.sin_addr
.s_addr
)
937 if (old
->addr
.sin_port
!= server
->addr
.sin_port
)
939 return !nfs_compare_fh(&old
->fh
, &server
->fh
);
942 static struct super_block
*nfs_get_sb(struct file_system_type
*fs_type
,
943 int flags
, const char *dev_name
, void *raw_data
)
946 struct nfs_server
*server
= NULL
;
947 struct super_block
*s
;
949 struct nfs_mount_data
*data
= raw_data
;
951 s
= ERR_PTR(-EINVAL
);
953 dprintk("%s: missing data argument\n", __FUNCTION__
);
956 if (data
->version
<= 0 || data
->version
> NFS_MOUNT_VERSION
) {
957 dprintk("%s: bad mount version\n", __FUNCTION__
);
960 switch (data
->version
) {
966 if (data
->flags
& NFS_MOUNT_VER3
) {
967 dprintk("%s: mount structure version %d does not support NFSv3\n",
972 data
->root
.size
= NFS2_FHSIZE
;
973 memcpy(data
->root
.data
, data
->old_root
.data
, NFS2_FHSIZE
);
975 if (data
->flags
& NFS_MOUNT_SECFLAVOUR
) {
976 dprintk("%s: mount structure version %d does not support strong security\n",
982 memset(data
->context
, 0, sizeof(data
->context
));
984 #ifndef CONFIG_NFS_V3
985 /* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
986 s
= ERR_PTR(-EPROTONOSUPPORT
);
987 if (data
->flags
& NFS_MOUNT_VER3
) {
988 dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__
);
991 #endif /* CONFIG_NFS_V3 */
993 s
= ERR_PTR(-ENOMEM
);
994 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
997 /* Zero out the NFS state stuff */
998 init_nfsv4_state(server
);
999 server
->client
= server
->client_sys
= server
->client_acl
= ERR_PTR(-EINVAL
);
1002 if (data
->flags
& NFS_MOUNT_VER3
)
1003 root
->size
= data
->root
.size
;
1005 root
->size
= NFS2_FHSIZE
;
1006 s
= ERR_PTR(-EINVAL
);
1007 if (root
->size
> sizeof(root
->data
)) {
1008 dprintk("%s: invalid root filehandle\n", __FUNCTION__
);
1011 memcpy(root
->data
, data
->root
.data
, root
->size
);
1013 /* We now require that the mount process passes the remote address */
1014 memcpy(&server
->addr
, &data
->addr
, sizeof(server
->addr
));
1015 if (server
->addr
.sin_addr
.s_addr
== INADDR_ANY
) {
1016 dprintk("%s: mount program didn't pass remote address!\n",
1021 /* Fire up rpciod if not yet running */
1022 s
= ERR_PTR(rpciod_up());
1024 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1025 __FUNCTION__
, PTR_ERR(s
));
1029 s
= sget(fs_type
, nfs_compare_super
, nfs_set_super
, server
);
1030 if (IS_ERR(s
) || s
->s_root
)
1031 goto out_rpciod_down
;
1035 error
= nfs_fill_super(s
, data
, flags
& MS_SILENT
? 1 : 0);
1037 up_write(&s
->s_umount
);
1038 deactivate_super(s
);
1039 return ERR_PTR(error
);
1041 s
->s_flags
|= MS_ACTIVE
;
1050 static void nfs_kill_super(struct super_block
*s
)
1052 struct nfs_server
*server
= NFS_SB(s
);
1056 if (!IS_ERR(server
->client
))
1057 rpc_shutdown_client(server
->client
);
1058 if (!IS_ERR(server
->client_sys
))
1059 rpc_shutdown_client(server
->client_sys
);
1060 if (!IS_ERR(server
->client_acl
))
1061 rpc_shutdown_client(server
->client_acl
);
1063 if (!(server
->flags
& NFS_MOUNT_NONLM
))
1064 lockd_down(); /* release rpc.lockd */
1066 rpciod_down(); /* release rpciod */
1068 nfs_free_iostats(server
->io_stats
);
1069 kfree(server
->hostname
);
1071 nfs_release_automount_timer();
1074 static struct super_block
*nfs_clone_sb(struct nfs_server
*server
, struct nfs_clone_mount
*data
)
1076 struct super_block
*sb
;
1078 server
->fsid
= data
->fattr
->fsid
;
1079 nfs_copy_fh(&server
->fh
, data
->fh
);
1080 sb
= sget(&nfs_fs_type
, nfs_compare_super
, nfs_set_super
, server
);
1081 if (!IS_ERR(sb
) && sb
->s_root
== NULL
&& !(server
->flags
& NFS_MOUNT_NONLM
))
1086 static struct super_block
*nfs_clone_nfs_sb(struct file_system_type
*fs_type
,
1087 int flags
, const char *dev_name
, void *raw_data
)
1089 struct nfs_clone_mount
*data
= raw_data
;
1090 return nfs_clone_generic_sb(data
, nfs_clone_sb
, nfs_clone_server
);
1093 #ifdef CONFIG_NFS_V4
1094 static struct rpc_clnt
*nfs4_create_client(struct nfs_server
*server
,
1095 struct rpc_timeout
*timeparms
, int proto
, rpc_authflavor_t flavor
)
1097 struct nfs4_client
*clp
;
1098 struct rpc_xprt
*xprt
= NULL
;
1099 struct rpc_clnt
*clnt
= NULL
;
1102 clp
= nfs4_get_client(&server
->addr
.sin_addr
);
1104 dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__
);
1105 return ERR_PTR(err
);
1108 /* Now create transport and client */
1109 down_write(&clp
->cl_sem
);
1110 if (IS_ERR(clp
->cl_rpcclient
)) {
1111 xprt
= xprt_create_proto(proto
, &server
->addr
, timeparms
);
1113 up_write(&clp
->cl_sem
);
1114 err
= PTR_ERR(xprt
);
1115 dprintk("%s: cannot create RPC transport. Error = %d\n",
1119 /* Bind to a reserved port! */
1121 clnt
= rpc_create_client(xprt
, server
->hostname
, &nfs_program
,
1122 server
->rpc_ops
->version
, flavor
);
1124 up_write(&clp
->cl_sem
);
1125 err
= PTR_ERR(clnt
);
1126 dprintk("%s: cannot create RPC client. Error = %d\n",
1131 clnt
->cl_softrtry
= 1;
1132 clp
->cl_rpcclient
= clnt
;
1133 memcpy(clp
->cl_ipaddr
, server
->ip_addr
, sizeof(clp
->cl_ipaddr
));
1136 list_add_tail(&server
->nfs4_siblings
, &clp
->cl_superblocks
);
1137 clnt
= rpc_clone_client(clp
->cl_rpcclient
);
1139 server
->nfs4_state
= clp
;
1140 up_write(&clp
->cl_sem
);
1144 dprintk("%s: cannot create RPC client. Error = %d\n",
1149 if (server
->nfs4_state
->cl_idmap
== NULL
) {
1150 dprintk("%s: failed to create idmapper.\n", __FUNCTION__
);
1151 return ERR_PTR(-ENOMEM
);
1154 if (clnt
->cl_auth
->au_flavor
!= flavor
) {
1155 struct rpc_auth
*auth
;
1157 auth
= rpcauth_create(flavor
, clnt
);
1159 dprintk("%s: couldn't create credcache!\n", __FUNCTION__
);
1160 return (struct rpc_clnt
*)auth
;
1167 nfs4_put_client(clp
);
1168 return ERR_PTR(err
);
1172 * Set up an NFS4 superblock
1174 static int nfs4_fill_super(struct super_block
*sb
, struct nfs4_mount_data
*data
, int silent
)
1176 struct nfs_server
*server
;
1177 struct rpc_timeout timeparms
;
1178 rpc_authflavor_t authflavour
;
1181 sb
->s_blocksize_bits
= 0;
1182 sb
->s_blocksize
= 0;
1183 server
= NFS_SB(sb
);
1184 if (data
->rsize
!= 0)
1185 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
1186 if (data
->wsize
!= 0)
1187 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
1188 server
->flags
= data
->flags
& NFS_MOUNT_FLAGMASK
;
1189 server
->caps
= NFS_CAP_ATOMIC_OPEN
;
1191 server
->acregmin
= data
->acregmin
*HZ
;
1192 server
->acregmax
= data
->acregmax
*HZ
;
1193 server
->acdirmin
= data
->acdirmin
*HZ
;
1194 server
->acdirmax
= data
->acdirmax
*HZ
;
1196 server
->rpc_ops
= &nfs_v4_clientops
;
1198 nfs_init_timeout_values(&timeparms
, data
->proto
, data
->timeo
, data
->retrans
);
1200 server
->retrans_timeo
= timeparms
.to_initval
;
1201 server
->retrans_count
= timeparms
.to_retries
;
1203 /* Now create transport and client */
1204 authflavour
= RPC_AUTH_UNIX
;
1205 if (data
->auth_flavourlen
!= 0) {
1206 if (data
->auth_flavourlen
!= 1) {
1207 dprintk("%s: Invalid number of RPC auth flavours %d.\n",
1208 __FUNCTION__
, data
->auth_flavourlen
);
1212 if (copy_from_user(&authflavour
, data
->auth_flavours
, sizeof(authflavour
))) {
1218 server
->client
= nfs4_create_client(server
, &timeparms
, data
->proto
, authflavour
);
1219 if (IS_ERR(server
->client
)) {
1220 err
= PTR_ERR(server
->client
);
1221 dprintk("%s: cannot create RPC client. Error = %d\n",
1226 sb
->s_time_gran
= 1;
1228 sb
->s_op
= &nfs4_sops
;
1229 err
= nfs_sb_init(sb
, authflavour
);
1235 static int nfs4_compare_super(struct super_block
*sb
, void *data
)
1237 struct nfs_server
*server
= data
;
1238 struct nfs_server
*old
= NFS_SB(sb
);
1240 if (strcmp(server
->hostname
, old
->hostname
) != 0)
1242 if (strcmp(server
->mnt_path
, old
->mnt_path
) != 0)
1248 nfs_copy_user_string(char *dst
, struct nfs_string
*src
, int maxlen
)
1253 return ERR_PTR(-EINVAL
);
1254 if (src
->len
< maxlen
)
1257 p
= dst
= kmalloc(maxlen
+ 1, GFP_KERNEL
);
1259 return ERR_PTR(-ENOMEM
);
1261 if (copy_from_user(dst
, src
->data
, maxlen
)) {
1263 return ERR_PTR(-EFAULT
);
1269 static struct super_block
*nfs4_get_sb(struct file_system_type
*fs_type
,
1270 int flags
, const char *dev_name
, void *raw_data
)
1273 struct nfs_server
*server
;
1274 struct super_block
*s
;
1275 struct nfs4_mount_data
*data
= raw_data
;
1279 dprintk("%s: missing data argument\n", __FUNCTION__
);
1280 return ERR_PTR(-EINVAL
);
1282 if (data
->version
<= 0 || data
->version
> NFS4_MOUNT_VERSION
) {
1283 dprintk("%s: bad mount version\n", __FUNCTION__
);
1284 return ERR_PTR(-EINVAL
);
1287 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
1289 return ERR_PTR(-ENOMEM
);
1290 /* Zero out the NFS state stuff */
1291 init_nfsv4_state(server
);
1292 server
->client
= server
->client_sys
= server
->client_acl
= ERR_PTR(-EINVAL
);
1294 p
= nfs_copy_user_string(NULL
, &data
->hostname
, 256);
1297 server
->hostname
= p
;
1299 p
= nfs_copy_user_string(NULL
, &data
->mnt_path
, 1024);
1302 server
->mnt_path
= p
;
1304 p
= nfs_copy_user_string(server
->ip_addr
, &data
->client_addr
,
1305 sizeof(server
->ip_addr
) - 1);
1309 /* We now require that the mount process passes the remote address */
1310 if (data
->host_addrlen
!= sizeof(server
->addr
)) {
1311 s
= ERR_PTR(-EINVAL
);
1314 if (copy_from_user(&server
->addr
, data
->host_addr
, sizeof(server
->addr
))) {
1315 s
= ERR_PTR(-EFAULT
);
1318 if (server
->addr
.sin_family
!= AF_INET
||
1319 server
->addr
.sin_addr
.s_addr
== INADDR_ANY
) {
1320 dprintk("%s: mount program didn't pass remote IP address!\n",
1322 s
= ERR_PTR(-EINVAL
);
1326 /* Fire up rpciod if not yet running */
1327 s
= ERR_PTR(rpciod_up());
1329 dprintk("%s: couldn't start rpciod! Error = %ld\n",
1330 __FUNCTION__
, PTR_ERR(s
));
1334 s
= sget(fs_type
, nfs4_compare_super
, nfs_set_super
, server
);
1336 if (IS_ERR(s
) || s
->s_root
)
1341 error
= nfs4_fill_super(s
, data
, flags
& MS_SILENT
? 1 : 0);
1343 up_write(&s
->s_umount
);
1344 deactivate_super(s
);
1345 return ERR_PTR(error
);
1347 s
->s_flags
|= MS_ACTIVE
;
1350 s
= (struct super_block
*)p
;
1352 kfree(server
->mnt_path
);
1353 kfree(server
->hostname
);
1358 static void nfs4_kill_super(struct super_block
*sb
)
1360 struct nfs_server
*server
= NFS_SB(sb
);
1362 nfs_return_all_delegations(sb
);
1363 kill_anon_super(sb
);
1365 nfs4_renewd_prepare_shutdown(server
);
1367 if (server
->client
!= NULL
&& !IS_ERR(server
->client
))
1368 rpc_shutdown_client(server
->client
);
1370 destroy_nfsv4_state(server
);
1374 nfs_free_iostats(server
->io_stats
);
1375 kfree(server
->hostname
);
1377 nfs_release_automount_timer();
1381 * Constructs the SERVER-side path
1383 static inline char *nfs4_dup_path(const struct dentry
*dentry
)
1385 char *page
= (char *) __get_free_page(GFP_USER
);
1388 path
= nfs4_path(dentry
, page
, PAGE_SIZE
);
1389 if (!IS_ERR(path
)) {
1390 int len
= PAGE_SIZE
+ page
- path
;
1393 path
= kmalloc(len
, GFP_KERNEL
);
1395 memcpy(path
, tmp
, len
);
1397 path
= ERR_PTR(-ENOMEM
);
1399 free_page((unsigned long)page
);
1403 static struct super_block
*nfs4_clone_sb(struct nfs_server
*server
, struct nfs_clone_mount
*data
)
1405 const struct dentry
*dentry
= data
->dentry
;
1406 struct nfs4_client
*clp
= server
->nfs4_state
;
1407 struct super_block
*sb
;
1409 server
->fsid
= data
->fattr
->fsid
;
1410 nfs_copy_fh(&server
->fh
, data
->fh
);
1411 server
->mnt_path
= nfs4_dup_path(dentry
);
1412 if (IS_ERR(server
->mnt_path
)) {
1413 sb
= (struct super_block
*)server
->mnt_path
;
1416 sb
= sget(&nfs4_fs_type
, nfs4_compare_super
, nfs_set_super
, server
);
1417 if (IS_ERR(sb
) || sb
->s_root
)
1419 nfs4_server_capabilities(server
, &server
->fh
);
1421 down_write(&clp
->cl_sem
);
1422 atomic_inc(&clp
->cl_count
);
1423 list_add_tail(&server
->nfs4_siblings
, &clp
->cl_superblocks
);
1424 up_write(&clp
->cl_sem
);
1427 kfree(server
->mnt_path
);
1429 server
->mnt_path
= NULL
;
1433 static struct super_block
*nfs_clone_nfs4_sb(struct file_system_type
*fs_type
,
1434 int flags
, const char *dev_name
, void *raw_data
)
1436 struct nfs_clone_mount
*data
= raw_data
;
1437 return nfs_clone_generic_sb(data
, nfs4_clone_sb
, nfs_clone_server
);
1440 static struct super_block
*nfs4_referral_sb(struct nfs_server
*server
, struct nfs_clone_mount
*data
)
1442 struct super_block
*sb
= ERR_PTR(-ENOMEM
);
1445 len
= strlen(data
->mnt_path
) + 1;
1446 server
->mnt_path
= kmalloc(len
, GFP_KERNEL
);
1447 if (server
->mnt_path
== NULL
)
1449 memcpy(server
->mnt_path
, data
->mnt_path
, len
);
1450 memcpy(&server
->addr
, data
->addr
, sizeof(struct sockaddr_in
));
1452 sb
= sget(&nfs4_fs_type
, nfs4_compare_super
, nfs_set_super
, server
);
1453 if (IS_ERR(sb
) || sb
->s_root
)
1457 kfree(server
->mnt_path
);
1459 server
->mnt_path
= NULL
;
1463 static struct nfs_server
*nfs4_referral_server(struct super_block
*sb
, struct nfs_clone_mount
*data
)
1465 struct nfs_server
*server
= NFS_SB(sb
);
1466 struct rpc_timeout timeparms
;
1467 int proto
, timeo
, retrans
;
1470 proto
= IPPROTO_TCP
;
1471 /* Since we are following a referral and there may be alternatives,
1472 set the timeouts and retries to low values */
1475 nfs_init_timeout_values(&timeparms
, proto
, timeo
, retrans
);
1477 server
->client
= nfs4_create_client(server
, &timeparms
, proto
, data
->authflavor
);
1478 if (IS_ERR((err
= server
->client
)))
1481 sb
->s_time_gran
= 1;
1482 sb
->s_op
= &nfs4_sops
;
1483 err
= ERR_PTR(nfs_sb_init(sb
, data
->authflavor
));
1487 return (struct nfs_server
*)err
;
1490 static struct super_block
*nfs_referral_nfs4_sb(struct file_system_type
*fs_type
,
1491 int flags
, const char *dev_name
, void *raw_data
)
1493 struct nfs_clone_mount
*data
= raw_data
;
1494 return nfs_clone_generic_sb(data
, nfs4_referral_sb
, nfs4_referral_server
);