1 /* client.c: NFS client sharing and management code
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/sched.h>
16 #include <linux/time.h>
17 #include <linux/kernel.h>
19 #include <linux/string.h>
20 #include <linux/stat.h>
21 #include <linux/errno.h>
22 #include <linux/unistd.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/stats.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/sunrpc/xprtsock.h>
27 #include <linux/sunrpc/xprtrdma.h>
28 #include <linux/nfs_fs.h>
29 #include <linux/nfs_mount.h>
30 #include <linux/nfs4_mount.h>
31 #include <linux/lockd/bind.h>
32 #include <linux/seq_file.h>
33 #include <linux/mount.h>
34 #include <linux/nfs_idmap.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/in6.h>
39 #include <linux/nfs_xdr.h>
41 #include <asm/system.h>
45 #include "delegation.h"
49 #define NFSDBG_FACILITY NFSDBG_CLIENT
51 static DEFINE_SPINLOCK(nfs_client_lock
);
52 static LIST_HEAD(nfs_client_list
);
53 static LIST_HEAD(nfs_volume_list
);
54 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq
);
59 static struct rpc_version
*nfs_version
[5] = {
69 struct rpc_program nfs_program
= {
71 .number
= NFS_PROGRAM
,
72 .nrvers
= ARRAY_SIZE(nfs_version
),
73 .version
= nfs_version
,
74 .stats
= &nfs_rpcstat
,
75 .pipe_dir_name
= "/nfs",
78 struct rpc_stat nfs_rpcstat
= {
79 .program
= &nfs_program
83 #ifdef CONFIG_NFS_V3_ACL
84 static struct rpc_stat nfsacl_rpcstat
= { &nfsacl_program
};
85 static struct rpc_version
* nfsacl_version
[] = {
86 [3] = &nfsacl_version3
,
89 struct rpc_program nfsacl_program
= {
91 .number
= NFS_ACL_PROGRAM
,
92 .nrvers
= ARRAY_SIZE(nfsacl_version
),
93 .version
= nfsacl_version
,
94 .stats
= &nfsacl_rpcstat
,
96 #endif /* CONFIG_NFS_V3_ACL */
98 struct nfs_client_initdata
{
100 const struct sockaddr
*addr
;
102 const struct nfs_rpc_ops
*rpc_ops
;
107 * Allocate a shared client record
109 * Since these are allocated/deallocated very rarely, we don't
110 * bother putting them in a slab cache...
112 static struct nfs_client
*nfs_alloc_client(const struct nfs_client_initdata
*cl_init
)
114 struct nfs_client
*clp
;
115 struct rpc_cred
*cred
;
117 if ((clp
= kzalloc(sizeof(*clp
), GFP_KERNEL
)) == NULL
)
120 clp
->rpc_ops
= cl_init
->rpc_ops
;
122 if (cl_init
->rpc_ops
->version
== 4) {
123 if (nfs_callback_up() < 0)
125 __set_bit(NFS_CS_CALLBACK
, &clp
->cl_res_state
);
128 atomic_set(&clp
->cl_count
, 1);
129 clp
->cl_cons_state
= NFS_CS_INITING
;
131 memcpy(&clp
->cl_addr
, cl_init
->addr
, cl_init
->addrlen
);
132 clp
->cl_addrlen
= cl_init
->addrlen
;
134 if (cl_init
->hostname
) {
135 clp
->cl_hostname
= kstrdup(cl_init
->hostname
, GFP_KERNEL
);
136 if (!clp
->cl_hostname
)
140 INIT_LIST_HEAD(&clp
->cl_superblocks
);
141 clp
->cl_rpcclient
= ERR_PTR(-EINVAL
);
143 clp
->cl_proto
= cl_init
->proto
;
146 INIT_LIST_HEAD(&clp
->cl_delegations
);
147 spin_lock_init(&clp
->cl_lock
);
148 INIT_DELAYED_WORK(&clp
->cl_renewd
, nfs4_renew_state
);
149 rpc_init_wait_queue(&clp
->cl_rpcwaitq
, "NFS client");
150 clp
->cl_boot_time
= CURRENT_TIME
;
151 clp
->cl_state
= 1 << NFS4CLNT_LEASE_EXPIRED
;
153 cred
= rpc_lookup_machine_cred();
155 clp
->cl_machine_cred
= cred
;
160 if (__test_and_clear_bit(NFS_CS_CALLBACK
, &clp
->cl_res_state
))
168 static void nfs4_shutdown_client(struct nfs_client
*clp
)
171 if (__test_and_clear_bit(NFS_CS_RENEWD
, &clp
->cl_res_state
))
172 nfs4_kill_renewd(clp
);
173 BUG_ON(!RB_EMPTY_ROOT(&clp
->cl_state_owners
));
174 if (__test_and_clear_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
))
175 nfs_idmap_delete(clp
);
177 rpc_destroy_wait_queue(&clp
->cl_rpcwaitq
);
182 * Destroy a shared client record
184 static void nfs_free_client(struct nfs_client
*clp
)
186 dprintk("--> nfs_free_client(%u)\n", clp
->rpc_ops
->version
);
188 nfs4_shutdown_client(clp
);
190 /* -EIO all pending I/O */
191 if (!IS_ERR(clp
->cl_rpcclient
))
192 rpc_shutdown_client(clp
->cl_rpcclient
);
194 if (__test_and_clear_bit(NFS_CS_CALLBACK
, &clp
->cl_res_state
))
197 if (clp
->cl_machine_cred
!= NULL
)
198 put_rpccred(clp
->cl_machine_cred
);
200 kfree(clp
->cl_hostname
);
203 dprintk("<-- nfs_free_client()\n");
207 * Release a reference to a shared client record
209 void nfs_put_client(struct nfs_client
*clp
)
214 dprintk("--> nfs_put_client({%d})\n", atomic_read(&clp
->cl_count
));
216 if (atomic_dec_and_lock(&clp
->cl_count
, &nfs_client_lock
)) {
217 list_del(&clp
->cl_share_link
);
218 spin_unlock(&nfs_client_lock
);
220 BUG_ON(!list_empty(&clp
->cl_superblocks
));
222 nfs_free_client(clp
);
226 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
227 static const struct in6_addr
*nfs_map_ipv4_addr(const struct sockaddr
*sa
, struct in6_addr
*addr_mapped
)
229 switch (sa
->sa_family
) {
233 return &((const struct sockaddr_in6
*)sa
)->sin6_addr
;
236 ipv6_addr_set_v4mapped(((const struct sockaddr_in
*)sa
)->sin_addr
.s_addr
,
242 static int nfs_sockaddr_match_ipaddr(const struct sockaddr
*sa1
,
243 const struct sockaddr
*sa2
)
245 const struct in6_addr
*addr1
;
246 const struct in6_addr
*addr2
;
247 struct in6_addr addr1_mapped
;
248 struct in6_addr addr2_mapped
;
250 addr1
= nfs_map_ipv4_addr(sa1
, &addr1_mapped
);
251 if (likely(addr1
!= NULL
)) {
252 addr2
= nfs_map_ipv4_addr(sa2
, &addr2_mapped
);
253 if (likely(addr2
!= NULL
))
254 return ipv6_addr_equal(addr1
, addr2
);
259 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in
*sa1
,
260 const struct sockaddr_in
*sa2
)
262 return sa1
->sin_addr
.s_addr
== sa2
->sin_addr
.s_addr
;
265 static int nfs_sockaddr_match_ipaddr(const struct sockaddr
*sa1
,
266 const struct sockaddr
*sa2
)
268 if (unlikely(sa1
->sa_family
!= AF_INET
|| sa2
->sa_family
!= AF_INET
))
270 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in
*)sa1
,
271 (const struct sockaddr_in
*)sa2
);
276 * Test if two ip4 socket addresses refer to the same socket, by
277 * comparing relevant fields. The padding bytes specifically, are
280 * The caller should ensure both socket addresses are AF_INET.
282 static int nfs_sockaddr_cmp_ip4(const struct sockaddr_in
* saddr1
,
283 const struct sockaddr_in
* saddr2
)
285 if (saddr1
->sin_addr
.s_addr
!= saddr2
->sin_addr
.s_addr
)
287 return saddr1
->sin_port
== saddr2
->sin_port
;
291 * Test if two ip6 socket addresses refer to the same socket by
292 * comparing relevant fields. The padding bytes specifically, are not
293 * compared. sin6_flowinfo is not compared because it only affects QoS
294 * and sin6_scope_id is only compared if the address is "link local"
295 * because "link local" addresses need only be unique to a specific
296 * link. Conversely, ordinary unicast addresses might have different
299 * The caller should ensure both socket addresses are AF_INET6.
301 static int nfs_sockaddr_cmp_ip6 (const struct sockaddr_in6
* saddr1
,
302 const struct sockaddr_in6
* saddr2
)
304 if (!ipv6_addr_equal(&saddr1
->sin6_addr
,
307 if (ipv6_addr_scope(&saddr1
->sin6_addr
) == IPV6_ADDR_SCOPE_LINKLOCAL
&&
308 saddr1
->sin6_scope_id
!= saddr2
->sin6_scope_id
)
310 return saddr1
->sin6_port
== saddr2
->sin6_port
;
314 * Test if two socket addresses represent the same actual socket,
315 * by comparing (only) relevant fields.
317 static int nfs_sockaddr_cmp(const struct sockaddr
*sa1
,
318 const struct sockaddr
*sa2
)
320 if (sa1
->sa_family
!= sa2
->sa_family
)
323 switch (sa1
->sa_family
) {
325 return nfs_sockaddr_cmp_ip4((const struct sockaddr_in
*) sa1
,
326 (const struct sockaddr_in
*) sa2
);
328 return nfs_sockaddr_cmp_ip6((const struct sockaddr_in6
*) sa1
,
329 (const struct sockaddr_in6
*) sa2
);
335 * Find a client by IP address and protocol version
336 * - returns NULL if no such client
338 struct nfs_client
*nfs_find_client(const struct sockaddr
*addr
, u32 nfsversion
)
340 struct nfs_client
*clp
;
342 spin_lock(&nfs_client_lock
);
343 list_for_each_entry(clp
, &nfs_client_list
, cl_share_link
) {
344 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
346 /* Don't match clients that failed to initialise properly */
347 if (clp
->cl_cons_state
!= NFS_CS_READY
)
350 /* Different NFS versions cannot share the same nfs_client */
351 if (clp
->rpc_ops
->version
!= nfsversion
)
354 /* Match only the IP address, not the port number */
355 if (!nfs_sockaddr_match_ipaddr(addr
, clap
))
358 atomic_inc(&clp
->cl_count
);
359 spin_unlock(&nfs_client_lock
);
362 spin_unlock(&nfs_client_lock
);
367 * Find a client by IP address and protocol version
368 * - returns NULL if no such client
370 struct nfs_client
*nfs_find_client_next(struct nfs_client
*clp
)
372 struct sockaddr
*sap
= (struct sockaddr
*)&clp
->cl_addr
;
373 u32 nfsvers
= clp
->rpc_ops
->version
;
375 spin_lock(&nfs_client_lock
);
376 list_for_each_entry_continue(clp
, &nfs_client_list
, cl_share_link
) {
377 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
379 /* Don't match clients that failed to initialise properly */
380 if (clp
->cl_cons_state
!= NFS_CS_READY
)
383 /* Different NFS versions cannot share the same nfs_client */
384 if (clp
->rpc_ops
->version
!= nfsvers
)
387 /* Match only the IP address, not the port number */
388 if (!nfs_sockaddr_match_ipaddr(sap
, clap
))
391 atomic_inc(&clp
->cl_count
);
392 spin_unlock(&nfs_client_lock
);
395 spin_unlock(&nfs_client_lock
);
400 * Find an nfs_client on the list that matches the initialisation data
403 static struct nfs_client
*nfs_match_client(const struct nfs_client_initdata
*data
)
405 struct nfs_client
*clp
;
406 const struct sockaddr
*sap
= data
->addr
;
408 list_for_each_entry(clp
, &nfs_client_list
, cl_share_link
) {
409 const struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
410 /* Don't match clients that failed to initialise properly */
411 if (clp
->cl_cons_state
< 0)
414 /* Different NFS versions cannot share the same nfs_client */
415 if (clp
->rpc_ops
!= data
->rpc_ops
)
418 if (clp
->cl_proto
!= data
->proto
)
421 /* Match the full socket address */
422 if (!nfs_sockaddr_cmp(sap
, clap
))
425 atomic_inc(&clp
->cl_count
);
432 * Look up a client by IP address and protocol version
433 * - creates a new record if one doesn't yet exist
435 static struct nfs_client
*nfs_get_client(const struct nfs_client_initdata
*cl_init
)
437 struct nfs_client
*clp
, *new = NULL
;
440 dprintk("--> nfs_get_client(%s,v%u)\n",
441 cl_init
->hostname
?: "", cl_init
->rpc_ops
->version
);
443 /* see if the client already exists */
445 spin_lock(&nfs_client_lock
);
447 clp
= nfs_match_client(cl_init
);
453 spin_unlock(&nfs_client_lock
);
455 new = nfs_alloc_client(cl_init
);
458 return ERR_PTR(-ENOMEM
);
460 /* install a new client and return with it unready */
463 list_add(&clp
->cl_share_link
, &nfs_client_list
);
464 spin_unlock(&nfs_client_lock
);
465 dprintk("--> nfs_get_client() = %p [new]\n", clp
);
468 /* found an existing client
469 * - make sure it's ready before returning
472 spin_unlock(&nfs_client_lock
);
475 nfs_free_client(new);
477 error
= wait_event_killable(nfs_client_active_wq
,
478 clp
->cl_cons_state
!= NFS_CS_INITING
);
481 return ERR_PTR(-ERESTARTSYS
);
484 if (clp
->cl_cons_state
< NFS_CS_READY
) {
485 error
= clp
->cl_cons_state
;
487 return ERR_PTR(error
);
490 BUG_ON(clp
->cl_cons_state
!= NFS_CS_READY
);
492 dprintk("--> nfs_get_client() = %p [share]\n", clp
);
497 * Mark a server as ready or failed
499 static void nfs_mark_client_ready(struct nfs_client
*clp
, int state
)
501 clp
->cl_cons_state
= state
;
502 wake_up_all(&nfs_client_active_wq
);
506 * Initialise the timeout values for a connection
508 static void nfs_init_timeout_values(struct rpc_timeout
*to
, int proto
,
509 unsigned int timeo
, unsigned int retrans
)
511 to
->to_initval
= timeo
* HZ
/ 10;
512 to
->to_retries
= retrans
;
515 case XPRT_TRANSPORT_TCP
:
516 case XPRT_TRANSPORT_RDMA
:
517 if (to
->to_retries
== 0)
518 to
->to_retries
= NFS_DEF_TCP_RETRANS
;
519 if (to
->to_initval
== 0)
520 to
->to_initval
= NFS_DEF_TCP_TIMEO
* HZ
/ 10;
521 if (to
->to_initval
> NFS_MAX_TCP_TIMEOUT
)
522 to
->to_initval
= NFS_MAX_TCP_TIMEOUT
;
523 to
->to_increment
= to
->to_initval
;
524 to
->to_maxval
= to
->to_initval
+ (to
->to_increment
* to
->to_retries
);
525 if (to
->to_maxval
> NFS_MAX_TCP_TIMEOUT
)
526 to
->to_maxval
= NFS_MAX_TCP_TIMEOUT
;
527 if (to
->to_maxval
< to
->to_initval
)
528 to
->to_maxval
= to
->to_initval
;
529 to
->to_exponential
= 0;
531 case XPRT_TRANSPORT_UDP
:
532 if (to
->to_retries
== 0)
533 to
->to_retries
= NFS_DEF_UDP_RETRANS
;
535 to
->to_initval
= NFS_DEF_UDP_TIMEO
* HZ
/ 10;
536 if (to
->to_initval
> NFS_MAX_UDP_TIMEOUT
)
537 to
->to_initval
= NFS_MAX_UDP_TIMEOUT
;
538 to
->to_maxval
= NFS_MAX_UDP_TIMEOUT
;
539 to
->to_exponential
= 1;
547 * Create an RPC client handle
549 static int nfs_create_rpc_client(struct nfs_client
*clp
,
550 const struct rpc_timeout
*timeparms
,
551 rpc_authflavor_t flavor
,
552 int discrtry
, int noresvport
)
554 struct rpc_clnt
*clnt
= NULL
;
555 struct rpc_create_args args
= {
556 .protocol
= clp
->cl_proto
,
557 .address
= (struct sockaddr
*)&clp
->cl_addr
,
558 .addrsize
= clp
->cl_addrlen
,
559 .timeout
= timeparms
,
560 .servername
= clp
->cl_hostname
,
561 .program
= &nfs_program
,
562 .version
= clp
->rpc_ops
->version
,
563 .authflavor
= flavor
,
567 args
.flags
|= RPC_CLNT_CREATE_DISCRTRY
;
569 args
.flags
|= RPC_CLNT_CREATE_NONPRIVPORT
;
571 if (!IS_ERR(clp
->cl_rpcclient
))
574 clnt
= rpc_create(&args
);
576 dprintk("%s: cannot create RPC client. Error = %ld\n",
577 __func__
, PTR_ERR(clnt
));
578 return PTR_ERR(clnt
);
581 clp
->cl_rpcclient
= clnt
;
586 * Version 2 or 3 client destruction
588 static void nfs_destroy_server(struct nfs_server
*server
)
590 if (!(server
->flags
& NFS_MOUNT_NONLM
))
591 nlmclnt_done(server
->nlm_host
);
595 * Version 2 or 3 lockd setup
597 static int nfs_start_lockd(struct nfs_server
*server
)
599 struct nlm_host
*host
;
600 struct nfs_client
*clp
= server
->nfs_client
;
601 struct nlmclnt_initdata nlm_init
= {
602 .hostname
= clp
->cl_hostname
,
603 .address
= (struct sockaddr
*)&clp
->cl_addr
,
604 .addrlen
= clp
->cl_addrlen
,
605 .protocol
= server
->flags
& NFS_MOUNT_TCP
?
606 IPPROTO_TCP
: IPPROTO_UDP
,
607 .nfs_version
= clp
->rpc_ops
->version
,
608 .noresvport
= server
->flags
& NFS_MOUNT_NORESVPORT
?
612 if (nlm_init
.nfs_version
> 3)
614 if (server
->flags
& NFS_MOUNT_NONLM
)
617 host
= nlmclnt_init(&nlm_init
);
619 return PTR_ERR(host
);
621 server
->nlm_host
= host
;
622 server
->destroy
= nfs_destroy_server
;
627 * Initialise an NFSv3 ACL client connection
629 #ifdef CONFIG_NFS_V3_ACL
630 static void nfs_init_server_aclclient(struct nfs_server
*server
)
632 if (server
->nfs_client
->rpc_ops
->version
!= 3)
634 if (server
->flags
& NFS_MOUNT_NOACL
)
637 server
->client_acl
= rpc_bind_new_program(server
->client
, &nfsacl_program
, 3);
638 if (IS_ERR(server
->client_acl
))
641 /* No errors! Assume that Sun nfsacls are supported */
642 server
->caps
|= NFS_CAP_ACLS
;
646 server
->caps
&= ~NFS_CAP_ACLS
;
649 static inline void nfs_init_server_aclclient(struct nfs_server
*server
)
651 server
->flags
&= ~NFS_MOUNT_NOACL
;
652 server
->caps
&= ~NFS_CAP_ACLS
;
657 * Create a general RPC client
659 static int nfs_init_server_rpcclient(struct nfs_server
*server
,
660 const struct rpc_timeout
*timeo
,
661 rpc_authflavor_t pseudoflavour
)
663 struct nfs_client
*clp
= server
->nfs_client
;
665 server
->client
= rpc_clone_client(clp
->cl_rpcclient
);
666 if (IS_ERR(server
->client
)) {
667 dprintk("%s: couldn't create rpc_client!\n", __func__
);
668 return PTR_ERR(server
->client
);
671 memcpy(&server
->client
->cl_timeout_default
,
673 sizeof(server
->client
->cl_timeout_default
));
674 server
->client
->cl_timeout
= &server
->client
->cl_timeout_default
;
676 if (pseudoflavour
!= clp
->cl_rpcclient
->cl_auth
->au_flavor
) {
677 struct rpc_auth
*auth
;
679 auth
= rpcauth_create(pseudoflavour
, server
->client
);
681 dprintk("%s: couldn't create credcache!\n", __func__
);
682 return PTR_ERR(auth
);
685 server
->client
->cl_softrtry
= 0;
686 if (server
->flags
& NFS_MOUNT_SOFT
)
687 server
->client
->cl_softrtry
= 1;
693 * Initialise an NFS2 or NFS3 client
695 static int nfs_init_client(struct nfs_client
*clp
,
696 const struct rpc_timeout
*timeparms
,
697 const struct nfs_parsed_mount_data
*data
)
701 if (clp
->cl_cons_state
== NFS_CS_READY
) {
702 /* the client is already initialised */
703 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp
);
708 * Create a client RPC handle for doing FSSTAT with UNIX auth only
709 * - RFC 2623, sec 2.3.2
711 error
= nfs_create_rpc_client(clp
, timeparms
, RPC_AUTH_UNIX
,
712 0, data
->flags
& NFS_MOUNT_NORESVPORT
);
715 nfs_mark_client_ready(clp
, NFS_CS_READY
);
719 nfs_mark_client_ready(clp
, error
);
720 dprintk("<-- nfs_init_client() = xerror %d\n", error
);
725 * Create a version 2 or 3 client
727 static int nfs_init_server(struct nfs_server
*server
,
728 const struct nfs_parsed_mount_data
*data
)
730 struct nfs_client_initdata cl_init
= {
731 .hostname
= data
->nfs_server
.hostname
,
732 .addr
= (const struct sockaddr
*)&data
->nfs_server
.address
,
733 .addrlen
= data
->nfs_server
.addrlen
,
734 .rpc_ops
= &nfs_v2_clientops
,
735 .proto
= data
->nfs_server
.protocol
,
737 struct rpc_timeout timeparms
;
738 struct nfs_client
*clp
;
741 dprintk("--> nfs_init_server()\n");
744 if (data
->flags
& NFS_MOUNT_VER3
)
745 cl_init
.rpc_ops
= &nfs_v3_clientops
;
748 /* Allocate or find a client reference we can use */
749 clp
= nfs_get_client(&cl_init
);
751 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp
));
755 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
756 data
->timeo
, data
->retrans
);
757 error
= nfs_init_client(clp
, &timeparms
, data
);
761 server
->nfs_client
= clp
;
763 /* Initialise the client representation from the mount data */
764 server
->flags
= data
->flags
;
767 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
769 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
771 server
->acregmin
= data
->acregmin
* HZ
;
772 server
->acregmax
= data
->acregmax
* HZ
;
773 server
->acdirmin
= data
->acdirmin
* HZ
;
774 server
->acdirmax
= data
->acdirmax
* HZ
;
776 /* Start lockd here, before we might error out */
777 error
= nfs_start_lockd(server
);
781 server
->port
= data
->nfs_server
.port
;
783 error
= nfs_init_server_rpcclient(server
, &timeparms
, data
->auth_flavors
[0]);
787 /* Preserve the values of mount_server-related mount options */
788 if (data
->mount_server
.addrlen
) {
789 memcpy(&server
->mountd_address
, &data
->mount_server
.address
,
790 data
->mount_server
.addrlen
);
791 server
->mountd_addrlen
= data
->mount_server
.addrlen
;
793 server
->mountd_version
= data
->mount_server
.version
;
794 server
->mountd_port
= data
->mount_server
.port
;
795 server
->mountd_protocol
= data
->mount_server
.protocol
;
797 server
->namelen
= data
->namlen
;
798 /* Create a client RPC handle for the NFSv3 ACL management interface */
799 nfs_init_server_aclclient(server
);
800 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp
);
804 server
->nfs_client
= NULL
;
806 dprintk("<-- nfs_init_server() = xerror %d\n", error
);
811 * Load up the server record from information gained in an fsinfo record
813 static void nfs_server_set_fsinfo(struct nfs_server
*server
, struct nfs_fsinfo
*fsinfo
)
815 unsigned long max_rpc_payload
;
817 /* Work out a lot of parameters */
818 if (server
->rsize
== 0)
819 server
->rsize
= nfs_block_size(fsinfo
->rtpref
, NULL
);
820 if (server
->wsize
== 0)
821 server
->wsize
= nfs_block_size(fsinfo
->wtpref
, NULL
);
823 if (fsinfo
->rtmax
>= 512 && server
->rsize
> fsinfo
->rtmax
)
824 server
->rsize
= nfs_block_size(fsinfo
->rtmax
, NULL
);
825 if (fsinfo
->wtmax
>= 512 && server
->wsize
> fsinfo
->wtmax
)
826 server
->wsize
= nfs_block_size(fsinfo
->wtmax
, NULL
);
828 max_rpc_payload
= nfs_block_size(rpc_max_payload(server
->client
), NULL
);
829 if (server
->rsize
> max_rpc_payload
)
830 server
->rsize
= max_rpc_payload
;
831 if (server
->rsize
> NFS_MAX_FILE_IO_SIZE
)
832 server
->rsize
= NFS_MAX_FILE_IO_SIZE
;
833 server
->rpages
= (server
->rsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
835 server
->backing_dev_info
.ra_pages
= server
->rpages
* NFS_MAX_READAHEAD
;
837 if (server
->wsize
> max_rpc_payload
)
838 server
->wsize
= max_rpc_payload
;
839 if (server
->wsize
> NFS_MAX_FILE_IO_SIZE
)
840 server
->wsize
= NFS_MAX_FILE_IO_SIZE
;
841 server
->wpages
= (server
->wsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
842 server
->wtmult
= nfs_block_bits(fsinfo
->wtmult
, NULL
);
844 server
->dtsize
= nfs_block_size(fsinfo
->dtpref
, NULL
);
845 if (server
->dtsize
> PAGE_CACHE_SIZE
)
846 server
->dtsize
= PAGE_CACHE_SIZE
;
847 if (server
->dtsize
> server
->rsize
)
848 server
->dtsize
= server
->rsize
;
850 if (server
->flags
& NFS_MOUNT_NOAC
) {
851 server
->acregmin
= server
->acregmax
= 0;
852 server
->acdirmin
= server
->acdirmax
= 0;
855 server
->maxfilesize
= fsinfo
->maxfilesize
;
857 /* We're airborne Set socket buffersize */
858 rpc_setbufsize(server
->client
, server
->wsize
+ 100, server
->rsize
+ 100);
862 * Probe filesystem information, including the FSID on v2/v3
864 static int nfs_probe_fsinfo(struct nfs_server
*server
, struct nfs_fh
*mntfh
, struct nfs_fattr
*fattr
)
866 struct nfs_fsinfo fsinfo
;
867 struct nfs_client
*clp
= server
->nfs_client
;
870 dprintk("--> nfs_probe_fsinfo()\n");
872 if (clp
->rpc_ops
->set_capabilities
!= NULL
) {
873 error
= clp
->rpc_ops
->set_capabilities(server
, mntfh
);
878 fsinfo
.fattr
= fattr
;
879 nfs_fattr_init(fattr
);
880 error
= clp
->rpc_ops
->fsinfo(server
, mntfh
, &fsinfo
);
884 nfs_server_set_fsinfo(server
, &fsinfo
);
885 error
= bdi_init(&server
->backing_dev_info
);
890 /* Get some general file system info */
891 if (server
->namelen
== 0) {
892 struct nfs_pathconf pathinfo
;
894 pathinfo
.fattr
= fattr
;
895 nfs_fattr_init(fattr
);
897 if (clp
->rpc_ops
->pathconf(server
, mntfh
, &pathinfo
) >= 0)
898 server
->namelen
= pathinfo
.max_namelen
;
901 dprintk("<-- nfs_probe_fsinfo() = 0\n");
905 dprintk("nfs_probe_fsinfo: error = %d\n", -error
);
910 * Copy useful information when duplicating a server record
912 static void nfs_server_copy_userdata(struct nfs_server
*target
, struct nfs_server
*source
)
914 target
->flags
= source
->flags
;
915 target
->acregmin
= source
->acregmin
;
916 target
->acregmax
= source
->acregmax
;
917 target
->acdirmin
= source
->acdirmin
;
918 target
->acdirmax
= source
->acdirmax
;
919 target
->caps
= source
->caps
;
923 * Allocate and initialise a server record
925 static struct nfs_server
*nfs_alloc_server(void)
927 struct nfs_server
*server
;
929 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
933 server
->client
= server
->client_acl
= ERR_PTR(-EINVAL
);
935 /* Zero out the NFS state stuff */
936 INIT_LIST_HEAD(&server
->client_link
);
937 INIT_LIST_HEAD(&server
->master_link
);
939 atomic_set(&server
->active
, 0);
941 server
->io_stats
= nfs_alloc_iostats();
942 if (!server
->io_stats
) {
951 * Free up a server record
953 void nfs_free_server(struct nfs_server
*server
)
955 dprintk("--> nfs_free_server()\n");
957 spin_lock(&nfs_client_lock
);
958 list_del(&server
->client_link
);
959 list_del(&server
->master_link
);
960 spin_unlock(&nfs_client_lock
);
962 if (server
->destroy
!= NULL
)
963 server
->destroy(server
);
965 if (!IS_ERR(server
->client_acl
))
966 rpc_shutdown_client(server
->client_acl
);
967 if (!IS_ERR(server
->client
))
968 rpc_shutdown_client(server
->client
);
970 nfs_put_client(server
->nfs_client
);
972 nfs_free_iostats(server
->io_stats
);
973 bdi_destroy(&server
->backing_dev_info
);
975 nfs_release_automount_timer();
976 dprintk("<-- nfs_free_server()\n");
980 * Create a version 2 or 3 volume record
981 * - keyed on server and FSID
983 struct nfs_server
*nfs_create_server(const struct nfs_parsed_mount_data
*data
,
984 struct nfs_fh
*mntfh
)
986 struct nfs_server
*server
;
987 struct nfs_fattr fattr
;
990 server
= nfs_alloc_server();
992 return ERR_PTR(-ENOMEM
);
994 /* Get a client representation */
995 error
= nfs_init_server(server
, data
);
999 BUG_ON(!server
->nfs_client
);
1000 BUG_ON(!server
->nfs_client
->rpc_ops
);
1001 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1003 /* Probe the root fh to retrieve its FSID */
1004 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1007 if (server
->nfs_client
->rpc_ops
->version
== 3) {
1008 if (server
->namelen
== 0 || server
->namelen
> NFS3_MAXNAMLEN
)
1009 server
->namelen
= NFS3_MAXNAMLEN
;
1010 if (!(data
->flags
& NFS_MOUNT_NORDIRPLUS
))
1011 server
->caps
|= NFS_CAP_READDIRPLUS
;
1013 if (server
->namelen
== 0 || server
->namelen
> NFS2_MAXNAMLEN
)
1014 server
->namelen
= NFS2_MAXNAMLEN
;
1017 if (!(fattr
.valid
& NFS_ATTR_FATTR
)) {
1018 error
= server
->nfs_client
->rpc_ops
->getattr(server
, mntfh
, &fattr
);
1020 dprintk("nfs_create_server: getattr error = %d\n", -error
);
1024 memcpy(&server
->fsid
, &fattr
.fsid
, sizeof(server
->fsid
));
1026 dprintk("Server FSID: %llx:%llx\n",
1027 (unsigned long long) server
->fsid
.major
,
1028 (unsigned long long) server
->fsid
.minor
);
1030 BUG_ON(!server
->nfs_client
);
1031 BUG_ON(!server
->nfs_client
->rpc_ops
);
1032 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1034 spin_lock(&nfs_client_lock
);
1035 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1036 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1037 spin_unlock(&nfs_client_lock
);
1039 server
->mount_time
= jiffies
;
1043 nfs_free_server(server
);
1044 return ERR_PTR(error
);
1047 #ifdef CONFIG_NFS_V4
1049 * Initialise an NFS4 client record
1051 static int nfs4_init_client(struct nfs_client
*clp
,
1052 const struct rpc_timeout
*timeparms
,
1053 const char *ip_addr
,
1054 rpc_authflavor_t authflavour
,
1059 if (clp
->cl_cons_state
== NFS_CS_READY
) {
1060 /* the client is initialised already */
1061 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp
);
1065 /* Check NFS protocol revision and initialize RPC op vector */
1066 clp
->rpc_ops
= &nfs_v4_clientops
;
1068 error
= nfs_create_rpc_client(clp
, timeparms
, authflavour
,
1069 1, flags
& NFS_MOUNT_NORESVPORT
);
1072 memcpy(clp
->cl_ipaddr
, ip_addr
, sizeof(clp
->cl_ipaddr
));
1074 error
= nfs_idmap_new(clp
);
1076 dprintk("%s: failed to create idmapper. Error = %d\n",
1080 __set_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
);
1082 nfs_mark_client_ready(clp
, NFS_CS_READY
);
1086 nfs_mark_client_ready(clp
, error
);
1087 dprintk("<-- nfs4_init_client() = xerror %d\n", error
);
1092 * Set up an NFS4 client
1094 static int nfs4_set_client(struct nfs_server
*server
,
1095 const char *hostname
,
1096 const struct sockaddr
*addr
,
1097 const size_t addrlen
,
1098 const char *ip_addr
,
1099 rpc_authflavor_t authflavour
,
1100 int proto
, const struct rpc_timeout
*timeparms
)
1102 struct nfs_client_initdata cl_init
= {
1103 .hostname
= hostname
,
1106 .rpc_ops
= &nfs_v4_clientops
,
1109 struct nfs_client
*clp
;
1112 dprintk("--> nfs4_set_client()\n");
1114 /* Allocate or find a client reference we can use */
1115 clp
= nfs_get_client(&cl_init
);
1117 error
= PTR_ERR(clp
);
1120 error
= nfs4_init_client(clp
, timeparms
, ip_addr
, authflavour
,
1125 server
->nfs_client
= clp
;
1126 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp
);
1130 nfs_put_client(clp
);
1132 dprintk("<-- nfs4_set_client() = xerror %d\n", error
);
1137 * Create a version 4 volume record
1139 static int nfs4_init_server(struct nfs_server
*server
,
1140 const struct nfs_parsed_mount_data
*data
)
1142 struct rpc_timeout timeparms
;
1145 dprintk("--> nfs4_init_server()\n");
1147 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
1148 data
->timeo
, data
->retrans
);
1150 /* Initialise the client representation from the mount data */
1151 server
->flags
= data
->flags
;
1152 server
->caps
|= NFS_CAP_ATOMIC_OPEN
;
1154 /* Get a client record */
1155 error
= nfs4_set_client(server
,
1156 data
->nfs_server
.hostname
,
1157 (const struct sockaddr
*)&data
->nfs_server
.address
,
1158 data
->nfs_server
.addrlen
,
1159 data
->client_address
,
1160 data
->auth_flavors
[0],
1161 data
->nfs_server
.protocol
,
1167 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
1169 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
1171 server
->acregmin
= data
->acregmin
* HZ
;
1172 server
->acregmax
= data
->acregmax
* HZ
;
1173 server
->acdirmin
= data
->acdirmin
* HZ
;
1174 server
->acdirmax
= data
->acdirmax
* HZ
;
1176 server
->port
= data
->nfs_server
.port
;
1178 error
= nfs_init_server_rpcclient(server
, &timeparms
, data
->auth_flavors
[0]);
1182 dprintk("<-- nfs4_init_server() = %d\n", error
);
1187 * Create a version 4 volume record
1188 * - keyed on server and FSID
1190 struct nfs_server
*nfs4_create_server(const struct nfs_parsed_mount_data
*data
,
1191 struct nfs_fh
*mntfh
)
1193 struct nfs_fattr fattr
;
1194 struct nfs_server
*server
;
1197 dprintk("--> nfs4_create_server()\n");
1199 server
= nfs_alloc_server();
1201 return ERR_PTR(-ENOMEM
);
1203 /* set up the general RPC client */
1204 error
= nfs4_init_server(server
, data
);
1208 BUG_ON(!server
->nfs_client
);
1209 BUG_ON(!server
->nfs_client
->rpc_ops
);
1210 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1212 /* Probe the root fh to retrieve its FSID */
1213 error
= nfs4_path_walk(server
, mntfh
, data
->nfs_server
.export_path
);
1217 dprintk("Server FSID: %llx:%llx\n",
1218 (unsigned long long) server
->fsid
.major
,
1219 (unsigned long long) server
->fsid
.minor
);
1220 dprintk("Mount FH: %d\n", mntfh
->size
);
1222 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1226 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1227 server
->namelen
= NFS4_MAXNAMLEN
;
1229 BUG_ON(!server
->nfs_client
);
1230 BUG_ON(!server
->nfs_client
->rpc_ops
);
1231 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1233 spin_lock(&nfs_client_lock
);
1234 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1235 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1236 spin_unlock(&nfs_client_lock
);
1238 server
->mount_time
= jiffies
;
1239 dprintk("<-- nfs4_create_server() = %p\n", server
);
1243 nfs_free_server(server
);
1244 dprintk("<-- nfs4_create_server() = error %d\n", error
);
1245 return ERR_PTR(error
);
1249 * Create an NFS4 referral server record
1251 struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*data
,
1252 struct nfs_fh
*mntfh
)
1254 struct nfs_client
*parent_client
;
1255 struct nfs_server
*server
, *parent_server
;
1256 struct nfs_fattr fattr
;
1259 dprintk("--> nfs4_create_referral_server()\n");
1261 server
= nfs_alloc_server();
1263 return ERR_PTR(-ENOMEM
);
1265 parent_server
= NFS_SB(data
->sb
);
1266 parent_client
= parent_server
->nfs_client
;
1268 /* Initialise the client representation from the parent server */
1269 nfs_server_copy_userdata(server
, parent_server
);
1270 server
->caps
|= NFS_CAP_ATOMIC_OPEN
;
1272 /* Get a client representation.
1273 * Note: NFSv4 always uses TCP, */
1274 error
= nfs4_set_client(server
, data
->hostname
,
1277 parent_client
->cl_ipaddr
,
1279 parent_server
->client
->cl_xprt
->prot
,
1280 parent_server
->client
->cl_timeout
);
1284 error
= nfs_init_server_rpcclient(server
, parent_server
->client
->cl_timeout
, data
->authflavor
);
1288 BUG_ON(!server
->nfs_client
);
1289 BUG_ON(!server
->nfs_client
->rpc_ops
);
1290 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1292 /* Probe the root fh to retrieve its FSID and filehandle */
1293 error
= nfs4_path_walk(server
, mntfh
, data
->mnt_path
);
1297 /* probe the filesystem info for this server filesystem */
1298 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1302 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1303 server
->namelen
= NFS4_MAXNAMLEN
;
1305 dprintk("Referral FSID: %llx:%llx\n",
1306 (unsigned long long) server
->fsid
.major
,
1307 (unsigned long long) server
->fsid
.minor
);
1309 spin_lock(&nfs_client_lock
);
1310 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1311 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1312 spin_unlock(&nfs_client_lock
);
1314 server
->mount_time
= jiffies
;
1316 dprintk("<-- nfs_create_referral_server() = %p\n", server
);
1320 nfs_free_server(server
);
1321 dprintk("<-- nfs4_create_referral_server() = error %d\n", error
);
1322 return ERR_PTR(error
);
1325 #endif /* CONFIG_NFS_V4 */
1328 * Clone an NFS2, NFS3 or NFS4 server record
1330 struct nfs_server
*nfs_clone_server(struct nfs_server
*source
,
1332 struct nfs_fattr
*fattr
)
1334 struct nfs_server
*server
;
1335 struct nfs_fattr fattr_fsinfo
;
1338 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1339 (unsigned long long) fattr
->fsid
.major
,
1340 (unsigned long long) fattr
->fsid
.minor
);
1342 server
= nfs_alloc_server();
1344 return ERR_PTR(-ENOMEM
);
1346 /* Copy data from the source */
1347 server
->nfs_client
= source
->nfs_client
;
1348 atomic_inc(&server
->nfs_client
->cl_count
);
1349 nfs_server_copy_userdata(server
, source
);
1351 server
->fsid
= fattr
->fsid
;
1353 error
= nfs_init_server_rpcclient(server
,
1354 source
->client
->cl_timeout
,
1355 source
->client
->cl_auth
->au_flavor
);
1357 goto out_free_server
;
1358 if (!IS_ERR(source
->client_acl
))
1359 nfs_init_server_aclclient(server
);
1361 /* probe the filesystem info for this server filesystem */
1362 error
= nfs_probe_fsinfo(server
, fh
, &fattr_fsinfo
);
1364 goto out_free_server
;
1366 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1367 server
->namelen
= NFS4_MAXNAMLEN
;
1369 dprintk("Cloned FSID: %llx:%llx\n",
1370 (unsigned long long) server
->fsid
.major
,
1371 (unsigned long long) server
->fsid
.minor
);
1373 error
= nfs_start_lockd(server
);
1375 goto out_free_server
;
1377 spin_lock(&nfs_client_lock
);
1378 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1379 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1380 spin_unlock(&nfs_client_lock
);
1382 server
->mount_time
= jiffies
;
1384 dprintk("<-- nfs_clone_server() = %p\n", server
);
1388 nfs_free_server(server
);
1389 dprintk("<-- nfs_clone_server() = error %d\n", error
);
1390 return ERR_PTR(error
);
1393 #ifdef CONFIG_PROC_FS
1394 static struct proc_dir_entry
*proc_fs_nfs
;
1396 static int nfs_server_list_open(struct inode
*inode
, struct file
*file
);
1397 static void *nfs_server_list_start(struct seq_file
*p
, loff_t
*pos
);
1398 static void *nfs_server_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
);
1399 static void nfs_server_list_stop(struct seq_file
*p
, void *v
);
1400 static int nfs_server_list_show(struct seq_file
*m
, void *v
);
1402 static struct seq_operations nfs_server_list_ops
= {
1403 .start
= nfs_server_list_start
,
1404 .next
= nfs_server_list_next
,
1405 .stop
= nfs_server_list_stop
,
1406 .show
= nfs_server_list_show
,
1409 static const struct file_operations nfs_server_list_fops
= {
1410 .open
= nfs_server_list_open
,
1412 .llseek
= seq_lseek
,
1413 .release
= seq_release
,
1414 .owner
= THIS_MODULE
,
1417 static int nfs_volume_list_open(struct inode
*inode
, struct file
*file
);
1418 static void *nfs_volume_list_start(struct seq_file
*p
, loff_t
*pos
);
1419 static void *nfs_volume_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
);
1420 static void nfs_volume_list_stop(struct seq_file
*p
, void *v
);
1421 static int nfs_volume_list_show(struct seq_file
*m
, void *v
);
1423 static struct seq_operations nfs_volume_list_ops
= {
1424 .start
= nfs_volume_list_start
,
1425 .next
= nfs_volume_list_next
,
1426 .stop
= nfs_volume_list_stop
,
1427 .show
= nfs_volume_list_show
,
1430 static const struct file_operations nfs_volume_list_fops
= {
1431 .open
= nfs_volume_list_open
,
1433 .llseek
= seq_lseek
,
1434 .release
= seq_release
,
1435 .owner
= THIS_MODULE
,
1439 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1442 static int nfs_server_list_open(struct inode
*inode
, struct file
*file
)
1447 ret
= seq_open(file
, &nfs_server_list_ops
);
1451 m
= file
->private_data
;
1452 m
->private = PDE(inode
)->data
;
1458 * set up the iterator to start reading from the server list and return the first item
1460 static void *nfs_server_list_start(struct seq_file
*m
, loff_t
*_pos
)
1462 /* lock the list against modification */
1463 spin_lock(&nfs_client_lock
);
1464 return seq_list_start_head(&nfs_client_list
, *_pos
);
1468 * move to next server
1470 static void *nfs_server_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
)
1472 return seq_list_next(v
, &nfs_client_list
, pos
);
1476 * clean up after reading from the transports list
1478 static void nfs_server_list_stop(struct seq_file
*p
, void *v
)
1480 spin_unlock(&nfs_client_lock
);
1484 * display a header line followed by a load of call lines
1486 static int nfs_server_list_show(struct seq_file
*m
, void *v
)
1488 struct nfs_client
*clp
;
1490 /* display header on line 1 */
1491 if (v
== &nfs_client_list
) {
1492 seq_puts(m
, "NV SERVER PORT USE HOSTNAME\n");
1496 /* display one transport per line on subsequent lines */
1497 clp
= list_entry(v
, struct nfs_client
, cl_share_link
);
1499 seq_printf(m
, "v%u %s %s %3d %s\n",
1500 clp
->rpc_ops
->version
,
1501 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_ADDR
),
1502 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_PORT
),
1503 atomic_read(&clp
->cl_count
),
1510 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1512 static int nfs_volume_list_open(struct inode
*inode
, struct file
*file
)
1517 ret
= seq_open(file
, &nfs_volume_list_ops
);
1521 m
= file
->private_data
;
1522 m
->private = PDE(inode
)->data
;
1528 * set up the iterator to start reading from the volume list and return the first item
1530 static void *nfs_volume_list_start(struct seq_file
*m
, loff_t
*_pos
)
1532 /* lock the list against modification */
1533 spin_lock(&nfs_client_lock
);
1534 return seq_list_start_head(&nfs_volume_list
, *_pos
);
1538 * move to next volume
1540 static void *nfs_volume_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
)
1542 return seq_list_next(v
, &nfs_volume_list
, pos
);
1546 * clean up after reading from the transports list
1548 static void nfs_volume_list_stop(struct seq_file
*p
, void *v
)
1550 spin_unlock(&nfs_client_lock
);
1554 * display a header line followed by a load of call lines
1556 static int nfs_volume_list_show(struct seq_file
*m
, void *v
)
1558 struct nfs_server
*server
;
1559 struct nfs_client
*clp
;
1560 char dev
[8], fsid
[17];
1562 /* display header on line 1 */
1563 if (v
== &nfs_volume_list
) {
1564 seq_puts(m
, "NV SERVER PORT DEV FSID\n");
1567 /* display one transport per line on subsequent lines */
1568 server
= list_entry(v
, struct nfs_server
, master_link
);
1569 clp
= server
->nfs_client
;
1571 snprintf(dev
, 8, "%u:%u",
1572 MAJOR(server
->s_dev
), MINOR(server
->s_dev
));
1574 snprintf(fsid
, 17, "%llx:%llx",
1575 (unsigned long long) server
->fsid
.major
,
1576 (unsigned long long) server
->fsid
.minor
);
1578 seq_printf(m
, "v%u %s %s %-7s %-17s\n",
1579 clp
->rpc_ops
->version
,
1580 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_ADDR
),
1581 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_PORT
),
1589 * initialise the /proc/fs/nfsfs/ directory
1591 int __init
nfs_fs_proc_init(void)
1593 struct proc_dir_entry
*p
;
1595 proc_fs_nfs
= proc_mkdir("fs/nfsfs", NULL
);
1599 proc_fs_nfs
->owner
= THIS_MODULE
;
1601 /* a file of servers with which we're dealing */
1602 p
= proc_create("servers", S_IFREG
|S_IRUGO
,
1603 proc_fs_nfs
, &nfs_server_list_fops
);
1607 /* a file of volumes that we have mounted */
1608 p
= proc_create("volumes", S_IFREG
|S_IRUGO
,
1609 proc_fs_nfs
, &nfs_volume_list_fops
);
1615 remove_proc_entry("servers", proc_fs_nfs
);
1617 remove_proc_entry("fs/nfsfs", NULL
);
1623 * clean up the /proc/fs/nfsfs/ directory
1625 void nfs_fs_proc_exit(void)
1627 remove_proc_entry("volumes", proc_fs_nfs
);
1628 remove_proc_entry("servers", proc_fs_nfs
);
1629 remove_proc_entry("fs/nfsfs", NULL
);
1632 #endif /* CONFIG_PROC_FS */