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)
228 * Test if two ip6 socket addresses refer to the same socket by
229 * comparing relevant fields. The padding bytes specifically, are not
230 * compared. sin6_flowinfo is not compared because it only affects QoS
231 * and sin6_scope_id is only compared if the address is "link local"
232 * because "link local" addresses need only be unique to a specific
233 * link. Conversely, ordinary unicast addresses might have different
236 * The caller should ensure both socket addresses are AF_INET6.
238 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr
*sa1
,
239 const struct sockaddr
*sa2
)
241 const struct sockaddr_in6
*sin1
= (const struct sockaddr_in6
*)sa1
;
242 const struct sockaddr_in6
*sin2
= (const struct sockaddr_in6
*)sa2
;
244 if (ipv6_addr_scope(&sin1
->sin6_addr
) == IPV6_ADDR_SCOPE_LINKLOCAL
&&
245 sin1
->sin6_scope_id
!= sin2
->sin6_scope_id
)
248 return ipv6_addr_equal(&sin1
->sin6_addr
, &sin1
->sin6_addr
);
250 #else /* !defined(CONFIG_IPV6) && !defined(CONFIG_IPV6_MODULE) */
251 static int nfs_sockaddr_match_ipaddr6(const struct sockaddr
*sa1
,
252 const struct sockaddr
*sa2
)
259 * Test if two ip4 socket addresses refer to the same socket, by
260 * comparing relevant fields. The padding bytes specifically, are
263 * The caller should ensure both socket addresses are AF_INET.
265 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr
*sa1
,
266 const struct sockaddr
*sa2
)
268 const struct sockaddr_in
*sin1
= (const struct sockaddr_in
*)sa1
;
269 const struct sockaddr_in
*sin2
= (const struct sockaddr_in
*)sa2
;
271 return sin1
->sin_addr
.s_addr
== sin2
->sin_addr
.s_addr
;
274 static int nfs_sockaddr_cmp_ip6(const struct sockaddr
*sa1
,
275 const struct sockaddr
*sa2
)
277 const struct sockaddr_in6
*sin1
= (const struct sockaddr_in6
*)sa1
;
278 const struct sockaddr_in6
*sin2
= (const struct sockaddr_in6
*)sa2
;
280 return nfs_sockaddr_match_ipaddr6(sa1
, sa2
) &&
281 (sin1
->sin6_port
== sin2
->sin6_port
);
284 static int nfs_sockaddr_cmp_ip4(const struct sockaddr
*sa1
,
285 const struct sockaddr
*sa2
)
287 const struct sockaddr_in
*sin1
= (const struct sockaddr_in
*)sa1
;
288 const struct sockaddr_in
*sin2
= (const struct sockaddr_in
*)sa2
;
290 return nfs_sockaddr_match_ipaddr4(sa1
, sa2
) &&
291 (sin1
->sin_port
== sin2
->sin_port
);
295 * Test if two socket addresses represent the same actual socket,
296 * by comparing (only) relevant fields, excluding the port number.
298 static int nfs_sockaddr_match_ipaddr(const struct sockaddr
*sa1
,
299 const struct sockaddr
*sa2
)
301 if (sa1
->sa_family
!= sa2
->sa_family
)
304 switch (sa1
->sa_family
) {
306 return nfs_sockaddr_match_ipaddr4(sa1
, sa2
);
308 return nfs_sockaddr_match_ipaddr6(sa1
, sa2
);
314 * Test if two socket addresses represent the same actual socket,
315 * by comparing (only) relevant fields, including the port number.
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(sa1
, sa2
);
327 return nfs_sockaddr_cmp_ip6(sa1
, sa2
);
333 * Find a client by IP address and protocol version
334 * - returns NULL if no such client
336 struct nfs_client
*nfs_find_client(const struct sockaddr
*addr
, u32 nfsversion
)
338 struct nfs_client
*clp
;
340 spin_lock(&nfs_client_lock
);
341 list_for_each_entry(clp
, &nfs_client_list
, cl_share_link
) {
342 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
344 /* Don't match clients that failed to initialise properly */
345 if (clp
->cl_cons_state
!= NFS_CS_READY
)
348 /* Different NFS versions cannot share the same nfs_client */
349 if (clp
->rpc_ops
->version
!= nfsversion
)
352 /* Match only the IP address, not the port number */
353 if (!nfs_sockaddr_match_ipaddr(addr
, clap
))
356 atomic_inc(&clp
->cl_count
);
357 spin_unlock(&nfs_client_lock
);
360 spin_unlock(&nfs_client_lock
);
365 * Find a client by IP address and protocol version
366 * - returns NULL if no such client
368 struct nfs_client
*nfs_find_client_next(struct nfs_client
*clp
)
370 struct sockaddr
*sap
= (struct sockaddr
*)&clp
->cl_addr
;
371 u32 nfsvers
= clp
->rpc_ops
->version
;
373 spin_lock(&nfs_client_lock
);
374 list_for_each_entry_continue(clp
, &nfs_client_list
, cl_share_link
) {
375 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
377 /* Don't match clients that failed to initialise properly */
378 if (clp
->cl_cons_state
!= NFS_CS_READY
)
381 /* Different NFS versions cannot share the same nfs_client */
382 if (clp
->rpc_ops
->version
!= nfsvers
)
385 /* Match only the IP address, not the port number */
386 if (!nfs_sockaddr_match_ipaddr(sap
, clap
))
389 atomic_inc(&clp
->cl_count
);
390 spin_unlock(&nfs_client_lock
);
393 spin_unlock(&nfs_client_lock
);
398 * Find an nfs_client on the list that matches the initialisation data
401 static struct nfs_client
*nfs_match_client(const struct nfs_client_initdata
*data
)
403 struct nfs_client
*clp
;
404 const struct sockaddr
*sap
= data
->addr
;
406 list_for_each_entry(clp
, &nfs_client_list
, cl_share_link
) {
407 const struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
408 /* Don't match clients that failed to initialise properly */
409 if (clp
->cl_cons_state
< 0)
412 /* Different NFS versions cannot share the same nfs_client */
413 if (clp
->rpc_ops
!= data
->rpc_ops
)
416 if (clp
->cl_proto
!= data
->proto
)
419 /* Match the full socket address */
420 if (!nfs_sockaddr_cmp(sap
, clap
))
423 atomic_inc(&clp
->cl_count
);
430 * Look up a client by IP address and protocol version
431 * - creates a new record if one doesn't yet exist
433 static struct nfs_client
*nfs_get_client(const struct nfs_client_initdata
*cl_init
)
435 struct nfs_client
*clp
, *new = NULL
;
438 dprintk("--> nfs_get_client(%s,v%u)\n",
439 cl_init
->hostname
?: "", cl_init
->rpc_ops
->version
);
441 /* see if the client already exists */
443 spin_lock(&nfs_client_lock
);
445 clp
= nfs_match_client(cl_init
);
451 spin_unlock(&nfs_client_lock
);
453 new = nfs_alloc_client(cl_init
);
456 return ERR_PTR(-ENOMEM
);
458 /* install a new client and return with it unready */
461 list_add(&clp
->cl_share_link
, &nfs_client_list
);
462 spin_unlock(&nfs_client_lock
);
463 dprintk("--> nfs_get_client() = %p [new]\n", clp
);
466 /* found an existing client
467 * - make sure it's ready before returning
470 spin_unlock(&nfs_client_lock
);
473 nfs_free_client(new);
475 error
= wait_event_killable(nfs_client_active_wq
,
476 clp
->cl_cons_state
!= NFS_CS_INITING
);
479 return ERR_PTR(-ERESTARTSYS
);
482 if (clp
->cl_cons_state
< NFS_CS_READY
) {
483 error
= clp
->cl_cons_state
;
485 return ERR_PTR(error
);
488 BUG_ON(clp
->cl_cons_state
!= NFS_CS_READY
);
490 dprintk("--> nfs_get_client() = %p [share]\n", clp
);
495 * Mark a server as ready or failed
497 static void nfs_mark_client_ready(struct nfs_client
*clp
, int state
)
499 clp
->cl_cons_state
= state
;
500 wake_up_all(&nfs_client_active_wq
);
504 * Initialise the timeout values for a connection
506 static void nfs_init_timeout_values(struct rpc_timeout
*to
, int proto
,
507 unsigned int timeo
, unsigned int retrans
)
509 to
->to_initval
= timeo
* HZ
/ 10;
510 to
->to_retries
= retrans
;
513 case XPRT_TRANSPORT_TCP
:
514 case XPRT_TRANSPORT_RDMA
:
515 if (to
->to_retries
== 0)
516 to
->to_retries
= NFS_DEF_TCP_RETRANS
;
517 if (to
->to_initval
== 0)
518 to
->to_initval
= NFS_DEF_TCP_TIMEO
* HZ
/ 10;
519 if (to
->to_initval
> NFS_MAX_TCP_TIMEOUT
)
520 to
->to_initval
= NFS_MAX_TCP_TIMEOUT
;
521 to
->to_increment
= to
->to_initval
;
522 to
->to_maxval
= to
->to_initval
+ (to
->to_increment
* to
->to_retries
);
523 if (to
->to_maxval
> NFS_MAX_TCP_TIMEOUT
)
524 to
->to_maxval
= NFS_MAX_TCP_TIMEOUT
;
525 if (to
->to_maxval
< to
->to_initval
)
526 to
->to_maxval
= to
->to_initval
;
527 to
->to_exponential
= 0;
529 case XPRT_TRANSPORT_UDP
:
530 if (to
->to_retries
== 0)
531 to
->to_retries
= NFS_DEF_UDP_RETRANS
;
533 to
->to_initval
= NFS_DEF_UDP_TIMEO
* HZ
/ 10;
534 if (to
->to_initval
> NFS_MAX_UDP_TIMEOUT
)
535 to
->to_initval
= NFS_MAX_UDP_TIMEOUT
;
536 to
->to_maxval
= NFS_MAX_UDP_TIMEOUT
;
537 to
->to_exponential
= 1;
545 * Create an RPC client handle
547 static int nfs_create_rpc_client(struct nfs_client
*clp
,
548 const struct rpc_timeout
*timeparms
,
549 rpc_authflavor_t flavor
,
550 int discrtry
, int noresvport
)
552 struct rpc_clnt
*clnt
= NULL
;
553 struct rpc_create_args args
= {
554 .protocol
= clp
->cl_proto
,
555 .address
= (struct sockaddr
*)&clp
->cl_addr
,
556 .addrsize
= clp
->cl_addrlen
,
557 .timeout
= timeparms
,
558 .servername
= clp
->cl_hostname
,
559 .program
= &nfs_program
,
560 .version
= clp
->rpc_ops
->version
,
561 .authflavor
= flavor
,
565 args
.flags
|= RPC_CLNT_CREATE_DISCRTRY
;
567 args
.flags
|= RPC_CLNT_CREATE_NONPRIVPORT
;
569 if (!IS_ERR(clp
->cl_rpcclient
))
572 clnt
= rpc_create(&args
);
574 dprintk("%s: cannot create RPC client. Error = %ld\n",
575 __func__
, PTR_ERR(clnt
));
576 return PTR_ERR(clnt
);
579 clp
->cl_rpcclient
= clnt
;
584 * Version 2 or 3 client destruction
586 static void nfs_destroy_server(struct nfs_server
*server
)
588 if (!(server
->flags
& NFS_MOUNT_NONLM
))
589 nlmclnt_done(server
->nlm_host
);
593 * Version 2 or 3 lockd setup
595 static int nfs_start_lockd(struct nfs_server
*server
)
597 struct nlm_host
*host
;
598 struct nfs_client
*clp
= server
->nfs_client
;
599 struct nlmclnt_initdata nlm_init
= {
600 .hostname
= clp
->cl_hostname
,
601 .address
= (struct sockaddr
*)&clp
->cl_addr
,
602 .addrlen
= clp
->cl_addrlen
,
603 .protocol
= server
->flags
& NFS_MOUNT_TCP
?
604 IPPROTO_TCP
: IPPROTO_UDP
,
605 .nfs_version
= clp
->rpc_ops
->version
,
606 .noresvport
= server
->flags
& NFS_MOUNT_NORESVPORT
?
610 if (nlm_init
.nfs_version
> 3)
612 if (server
->flags
& NFS_MOUNT_NONLM
)
615 host
= nlmclnt_init(&nlm_init
);
617 return PTR_ERR(host
);
619 server
->nlm_host
= host
;
620 server
->destroy
= nfs_destroy_server
;
625 * Initialise an NFSv3 ACL client connection
627 #ifdef CONFIG_NFS_V3_ACL
628 static void nfs_init_server_aclclient(struct nfs_server
*server
)
630 if (server
->nfs_client
->rpc_ops
->version
!= 3)
632 if (server
->flags
& NFS_MOUNT_NOACL
)
635 server
->client_acl
= rpc_bind_new_program(server
->client
, &nfsacl_program
, 3);
636 if (IS_ERR(server
->client_acl
))
639 /* No errors! Assume that Sun nfsacls are supported */
640 server
->caps
|= NFS_CAP_ACLS
;
644 server
->caps
&= ~NFS_CAP_ACLS
;
647 static inline void nfs_init_server_aclclient(struct nfs_server
*server
)
649 server
->flags
&= ~NFS_MOUNT_NOACL
;
650 server
->caps
&= ~NFS_CAP_ACLS
;
655 * Create a general RPC client
657 static int nfs_init_server_rpcclient(struct nfs_server
*server
,
658 const struct rpc_timeout
*timeo
,
659 rpc_authflavor_t pseudoflavour
)
661 struct nfs_client
*clp
= server
->nfs_client
;
663 server
->client
= rpc_clone_client(clp
->cl_rpcclient
);
664 if (IS_ERR(server
->client
)) {
665 dprintk("%s: couldn't create rpc_client!\n", __func__
);
666 return PTR_ERR(server
->client
);
669 memcpy(&server
->client
->cl_timeout_default
,
671 sizeof(server
->client
->cl_timeout_default
));
672 server
->client
->cl_timeout
= &server
->client
->cl_timeout_default
;
674 if (pseudoflavour
!= clp
->cl_rpcclient
->cl_auth
->au_flavor
) {
675 struct rpc_auth
*auth
;
677 auth
= rpcauth_create(pseudoflavour
, server
->client
);
679 dprintk("%s: couldn't create credcache!\n", __func__
);
680 return PTR_ERR(auth
);
683 server
->client
->cl_softrtry
= 0;
684 if (server
->flags
& NFS_MOUNT_SOFT
)
685 server
->client
->cl_softrtry
= 1;
691 * Initialise an NFS2 or NFS3 client
693 static int nfs_init_client(struct nfs_client
*clp
,
694 const struct rpc_timeout
*timeparms
,
695 const struct nfs_parsed_mount_data
*data
)
699 if (clp
->cl_cons_state
== NFS_CS_READY
) {
700 /* the client is already initialised */
701 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp
);
706 * Create a client RPC handle for doing FSSTAT with UNIX auth only
707 * - RFC 2623, sec 2.3.2
709 error
= nfs_create_rpc_client(clp
, timeparms
, RPC_AUTH_UNIX
,
710 0, data
->flags
& NFS_MOUNT_NORESVPORT
);
713 nfs_mark_client_ready(clp
, NFS_CS_READY
);
717 nfs_mark_client_ready(clp
, error
);
718 dprintk("<-- nfs_init_client() = xerror %d\n", error
);
723 * Create a version 2 or 3 client
725 static int nfs_init_server(struct nfs_server
*server
,
726 const struct nfs_parsed_mount_data
*data
)
728 struct nfs_client_initdata cl_init
= {
729 .hostname
= data
->nfs_server
.hostname
,
730 .addr
= (const struct sockaddr
*)&data
->nfs_server
.address
,
731 .addrlen
= data
->nfs_server
.addrlen
,
732 .rpc_ops
= &nfs_v2_clientops
,
733 .proto
= data
->nfs_server
.protocol
,
735 struct rpc_timeout timeparms
;
736 struct nfs_client
*clp
;
739 dprintk("--> nfs_init_server()\n");
742 if (data
->flags
& NFS_MOUNT_VER3
)
743 cl_init
.rpc_ops
= &nfs_v3_clientops
;
746 /* Allocate or find a client reference we can use */
747 clp
= nfs_get_client(&cl_init
);
749 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp
));
753 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
754 data
->timeo
, data
->retrans
);
755 error
= nfs_init_client(clp
, &timeparms
, data
);
759 server
->nfs_client
= clp
;
761 /* Initialise the client representation from the mount data */
762 server
->flags
= data
->flags
;
765 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
767 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
769 server
->acregmin
= data
->acregmin
* HZ
;
770 server
->acregmax
= data
->acregmax
* HZ
;
771 server
->acdirmin
= data
->acdirmin
* HZ
;
772 server
->acdirmax
= data
->acdirmax
* HZ
;
774 /* Start lockd here, before we might error out */
775 error
= nfs_start_lockd(server
);
779 server
->port
= data
->nfs_server
.port
;
781 error
= nfs_init_server_rpcclient(server
, &timeparms
, data
->auth_flavors
[0]);
785 /* Preserve the values of mount_server-related mount options */
786 if (data
->mount_server
.addrlen
) {
787 memcpy(&server
->mountd_address
, &data
->mount_server
.address
,
788 data
->mount_server
.addrlen
);
789 server
->mountd_addrlen
= data
->mount_server
.addrlen
;
791 server
->mountd_version
= data
->mount_server
.version
;
792 server
->mountd_port
= data
->mount_server
.port
;
793 server
->mountd_protocol
= data
->mount_server
.protocol
;
795 server
->namelen
= data
->namlen
;
796 /* Create a client RPC handle for the NFSv3 ACL management interface */
797 nfs_init_server_aclclient(server
);
798 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp
);
802 server
->nfs_client
= NULL
;
804 dprintk("<-- nfs_init_server() = xerror %d\n", error
);
809 * Load up the server record from information gained in an fsinfo record
811 static void nfs_server_set_fsinfo(struct nfs_server
*server
, struct nfs_fsinfo
*fsinfo
)
813 unsigned long max_rpc_payload
;
815 /* Work out a lot of parameters */
816 if (server
->rsize
== 0)
817 server
->rsize
= nfs_block_size(fsinfo
->rtpref
, NULL
);
818 if (server
->wsize
== 0)
819 server
->wsize
= nfs_block_size(fsinfo
->wtpref
, NULL
);
821 if (fsinfo
->rtmax
>= 512 && server
->rsize
> fsinfo
->rtmax
)
822 server
->rsize
= nfs_block_size(fsinfo
->rtmax
, NULL
);
823 if (fsinfo
->wtmax
>= 512 && server
->wsize
> fsinfo
->wtmax
)
824 server
->wsize
= nfs_block_size(fsinfo
->wtmax
, NULL
);
826 max_rpc_payload
= nfs_block_size(rpc_max_payload(server
->client
), NULL
);
827 if (server
->rsize
> max_rpc_payload
)
828 server
->rsize
= max_rpc_payload
;
829 if (server
->rsize
> NFS_MAX_FILE_IO_SIZE
)
830 server
->rsize
= NFS_MAX_FILE_IO_SIZE
;
831 server
->rpages
= (server
->rsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
833 server
->backing_dev_info
.ra_pages
= server
->rpages
* NFS_MAX_READAHEAD
;
835 if (server
->wsize
> max_rpc_payload
)
836 server
->wsize
= max_rpc_payload
;
837 if (server
->wsize
> NFS_MAX_FILE_IO_SIZE
)
838 server
->wsize
= NFS_MAX_FILE_IO_SIZE
;
839 server
->wpages
= (server
->wsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
840 server
->wtmult
= nfs_block_bits(fsinfo
->wtmult
, NULL
);
842 server
->dtsize
= nfs_block_size(fsinfo
->dtpref
, NULL
);
843 if (server
->dtsize
> PAGE_CACHE_SIZE
)
844 server
->dtsize
= PAGE_CACHE_SIZE
;
845 if (server
->dtsize
> server
->rsize
)
846 server
->dtsize
= server
->rsize
;
848 if (server
->flags
& NFS_MOUNT_NOAC
) {
849 server
->acregmin
= server
->acregmax
= 0;
850 server
->acdirmin
= server
->acdirmax
= 0;
853 server
->maxfilesize
= fsinfo
->maxfilesize
;
855 /* We're airborne Set socket buffersize */
856 rpc_setbufsize(server
->client
, server
->wsize
+ 100, server
->rsize
+ 100);
860 * Probe filesystem information, including the FSID on v2/v3
862 static int nfs_probe_fsinfo(struct nfs_server
*server
, struct nfs_fh
*mntfh
, struct nfs_fattr
*fattr
)
864 struct nfs_fsinfo fsinfo
;
865 struct nfs_client
*clp
= server
->nfs_client
;
868 dprintk("--> nfs_probe_fsinfo()\n");
870 if (clp
->rpc_ops
->set_capabilities
!= NULL
) {
871 error
= clp
->rpc_ops
->set_capabilities(server
, mntfh
);
876 fsinfo
.fattr
= fattr
;
877 nfs_fattr_init(fattr
);
878 error
= clp
->rpc_ops
->fsinfo(server
, mntfh
, &fsinfo
);
882 nfs_server_set_fsinfo(server
, &fsinfo
);
883 error
= bdi_init(&server
->backing_dev_info
);
888 /* Get some general file system info */
889 if (server
->namelen
== 0) {
890 struct nfs_pathconf pathinfo
;
892 pathinfo
.fattr
= fattr
;
893 nfs_fattr_init(fattr
);
895 if (clp
->rpc_ops
->pathconf(server
, mntfh
, &pathinfo
) >= 0)
896 server
->namelen
= pathinfo
.max_namelen
;
899 dprintk("<-- nfs_probe_fsinfo() = 0\n");
903 dprintk("nfs_probe_fsinfo: error = %d\n", -error
);
908 * Copy useful information when duplicating a server record
910 static void nfs_server_copy_userdata(struct nfs_server
*target
, struct nfs_server
*source
)
912 target
->flags
= source
->flags
;
913 target
->acregmin
= source
->acregmin
;
914 target
->acregmax
= source
->acregmax
;
915 target
->acdirmin
= source
->acdirmin
;
916 target
->acdirmax
= source
->acdirmax
;
917 target
->caps
= source
->caps
;
921 * Allocate and initialise a server record
923 static struct nfs_server
*nfs_alloc_server(void)
925 struct nfs_server
*server
;
927 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
931 server
->client
= server
->client_acl
= ERR_PTR(-EINVAL
);
933 /* Zero out the NFS state stuff */
934 INIT_LIST_HEAD(&server
->client_link
);
935 INIT_LIST_HEAD(&server
->master_link
);
937 atomic_set(&server
->active
, 0);
939 server
->io_stats
= nfs_alloc_iostats();
940 if (!server
->io_stats
) {
949 * Free up a server record
951 void nfs_free_server(struct nfs_server
*server
)
953 dprintk("--> nfs_free_server()\n");
955 spin_lock(&nfs_client_lock
);
956 list_del(&server
->client_link
);
957 list_del(&server
->master_link
);
958 spin_unlock(&nfs_client_lock
);
960 if (server
->destroy
!= NULL
)
961 server
->destroy(server
);
963 if (!IS_ERR(server
->client_acl
))
964 rpc_shutdown_client(server
->client_acl
);
965 if (!IS_ERR(server
->client
))
966 rpc_shutdown_client(server
->client
);
968 nfs_put_client(server
->nfs_client
);
970 nfs_free_iostats(server
->io_stats
);
971 bdi_destroy(&server
->backing_dev_info
);
973 nfs_release_automount_timer();
974 dprintk("<-- nfs_free_server()\n");
978 * Create a version 2 or 3 volume record
979 * - keyed on server and FSID
981 struct nfs_server
*nfs_create_server(const struct nfs_parsed_mount_data
*data
,
982 struct nfs_fh
*mntfh
)
984 struct nfs_server
*server
;
985 struct nfs_fattr fattr
;
988 server
= nfs_alloc_server();
990 return ERR_PTR(-ENOMEM
);
992 /* Get a client representation */
993 error
= nfs_init_server(server
, data
);
997 BUG_ON(!server
->nfs_client
);
998 BUG_ON(!server
->nfs_client
->rpc_ops
);
999 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1001 /* Probe the root fh to retrieve its FSID */
1002 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1005 if (server
->nfs_client
->rpc_ops
->version
== 3) {
1006 if (server
->namelen
== 0 || server
->namelen
> NFS3_MAXNAMLEN
)
1007 server
->namelen
= NFS3_MAXNAMLEN
;
1008 if (!(data
->flags
& NFS_MOUNT_NORDIRPLUS
))
1009 server
->caps
|= NFS_CAP_READDIRPLUS
;
1011 if (server
->namelen
== 0 || server
->namelen
> NFS2_MAXNAMLEN
)
1012 server
->namelen
= NFS2_MAXNAMLEN
;
1015 if (!(fattr
.valid
& NFS_ATTR_FATTR
)) {
1016 error
= server
->nfs_client
->rpc_ops
->getattr(server
, mntfh
, &fattr
);
1018 dprintk("nfs_create_server: getattr error = %d\n", -error
);
1022 memcpy(&server
->fsid
, &fattr
.fsid
, sizeof(server
->fsid
));
1024 dprintk("Server FSID: %llx:%llx\n",
1025 (unsigned long long) server
->fsid
.major
,
1026 (unsigned long long) server
->fsid
.minor
);
1028 BUG_ON(!server
->nfs_client
);
1029 BUG_ON(!server
->nfs_client
->rpc_ops
);
1030 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1032 spin_lock(&nfs_client_lock
);
1033 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1034 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1035 spin_unlock(&nfs_client_lock
);
1037 server
->mount_time
= jiffies
;
1041 nfs_free_server(server
);
1042 return ERR_PTR(error
);
1045 #ifdef CONFIG_NFS_V4
1047 * Initialise an NFS4 client record
1049 static int nfs4_init_client(struct nfs_client
*clp
,
1050 const struct rpc_timeout
*timeparms
,
1051 const char *ip_addr
,
1052 rpc_authflavor_t authflavour
,
1057 if (clp
->cl_cons_state
== NFS_CS_READY
) {
1058 /* the client is initialised already */
1059 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp
);
1063 /* Check NFS protocol revision and initialize RPC op vector */
1064 clp
->rpc_ops
= &nfs_v4_clientops
;
1066 error
= nfs_create_rpc_client(clp
, timeparms
, authflavour
,
1067 1, flags
& NFS_MOUNT_NORESVPORT
);
1070 memcpy(clp
->cl_ipaddr
, ip_addr
, sizeof(clp
->cl_ipaddr
));
1072 error
= nfs_idmap_new(clp
);
1074 dprintk("%s: failed to create idmapper. Error = %d\n",
1078 __set_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
);
1080 nfs_mark_client_ready(clp
, NFS_CS_READY
);
1084 nfs_mark_client_ready(clp
, error
);
1085 dprintk("<-- nfs4_init_client() = xerror %d\n", error
);
1090 * Set up an NFS4 client
1092 static int nfs4_set_client(struct nfs_server
*server
,
1093 const char *hostname
,
1094 const struct sockaddr
*addr
,
1095 const size_t addrlen
,
1096 const char *ip_addr
,
1097 rpc_authflavor_t authflavour
,
1098 int proto
, const struct rpc_timeout
*timeparms
)
1100 struct nfs_client_initdata cl_init
= {
1101 .hostname
= hostname
,
1104 .rpc_ops
= &nfs_v4_clientops
,
1107 struct nfs_client
*clp
;
1110 dprintk("--> nfs4_set_client()\n");
1112 /* Allocate or find a client reference we can use */
1113 clp
= nfs_get_client(&cl_init
);
1115 error
= PTR_ERR(clp
);
1118 error
= nfs4_init_client(clp
, timeparms
, ip_addr
, authflavour
,
1123 server
->nfs_client
= clp
;
1124 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp
);
1128 nfs_put_client(clp
);
1130 dprintk("<-- nfs4_set_client() = xerror %d\n", error
);
1135 * Create a version 4 volume record
1137 static int nfs4_init_server(struct nfs_server
*server
,
1138 const struct nfs_parsed_mount_data
*data
)
1140 struct rpc_timeout timeparms
;
1143 dprintk("--> nfs4_init_server()\n");
1145 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
1146 data
->timeo
, data
->retrans
);
1148 /* Initialise the client representation from the mount data */
1149 server
->flags
= data
->flags
;
1150 server
->caps
|= NFS_CAP_ATOMIC_OPEN
;
1152 /* Get a client record */
1153 error
= nfs4_set_client(server
,
1154 data
->nfs_server
.hostname
,
1155 (const struct sockaddr
*)&data
->nfs_server
.address
,
1156 data
->nfs_server
.addrlen
,
1157 data
->client_address
,
1158 data
->auth_flavors
[0],
1159 data
->nfs_server
.protocol
,
1165 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
1167 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
1169 server
->acregmin
= data
->acregmin
* HZ
;
1170 server
->acregmax
= data
->acregmax
* HZ
;
1171 server
->acdirmin
= data
->acdirmin
* HZ
;
1172 server
->acdirmax
= data
->acdirmax
* HZ
;
1174 server
->port
= data
->nfs_server
.port
;
1176 error
= nfs_init_server_rpcclient(server
, &timeparms
, data
->auth_flavors
[0]);
1180 dprintk("<-- nfs4_init_server() = %d\n", error
);
1185 * Create a version 4 volume record
1186 * - keyed on server and FSID
1188 struct nfs_server
*nfs4_create_server(const struct nfs_parsed_mount_data
*data
,
1189 struct nfs_fh
*mntfh
)
1191 struct nfs_fattr fattr
;
1192 struct nfs_server
*server
;
1195 dprintk("--> nfs4_create_server()\n");
1197 server
= nfs_alloc_server();
1199 return ERR_PTR(-ENOMEM
);
1201 /* set up the general RPC client */
1202 error
= nfs4_init_server(server
, data
);
1206 BUG_ON(!server
->nfs_client
);
1207 BUG_ON(!server
->nfs_client
->rpc_ops
);
1208 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1210 /* Probe the root fh to retrieve its FSID */
1211 error
= nfs4_path_walk(server
, mntfh
, data
->nfs_server
.export_path
);
1215 dprintk("Server FSID: %llx:%llx\n",
1216 (unsigned long long) server
->fsid
.major
,
1217 (unsigned long long) server
->fsid
.minor
);
1218 dprintk("Mount FH: %d\n", mntfh
->size
);
1220 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1224 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1225 server
->namelen
= NFS4_MAXNAMLEN
;
1227 BUG_ON(!server
->nfs_client
);
1228 BUG_ON(!server
->nfs_client
->rpc_ops
);
1229 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1231 spin_lock(&nfs_client_lock
);
1232 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1233 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1234 spin_unlock(&nfs_client_lock
);
1236 server
->mount_time
= jiffies
;
1237 dprintk("<-- nfs4_create_server() = %p\n", server
);
1241 nfs_free_server(server
);
1242 dprintk("<-- nfs4_create_server() = error %d\n", error
);
1243 return ERR_PTR(error
);
1247 * Create an NFS4 referral server record
1249 struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*data
,
1250 struct nfs_fh
*mntfh
)
1252 struct nfs_client
*parent_client
;
1253 struct nfs_server
*server
, *parent_server
;
1254 struct nfs_fattr fattr
;
1257 dprintk("--> nfs4_create_referral_server()\n");
1259 server
= nfs_alloc_server();
1261 return ERR_PTR(-ENOMEM
);
1263 parent_server
= NFS_SB(data
->sb
);
1264 parent_client
= parent_server
->nfs_client
;
1266 /* Initialise the client representation from the parent server */
1267 nfs_server_copy_userdata(server
, parent_server
);
1268 server
->caps
|= NFS_CAP_ATOMIC_OPEN
;
1270 /* Get a client representation.
1271 * Note: NFSv4 always uses TCP, */
1272 error
= nfs4_set_client(server
, data
->hostname
,
1275 parent_client
->cl_ipaddr
,
1277 parent_server
->client
->cl_xprt
->prot
,
1278 parent_server
->client
->cl_timeout
);
1282 error
= nfs_init_server_rpcclient(server
, parent_server
->client
->cl_timeout
, data
->authflavor
);
1286 BUG_ON(!server
->nfs_client
);
1287 BUG_ON(!server
->nfs_client
->rpc_ops
);
1288 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1290 /* Probe the root fh to retrieve its FSID and filehandle */
1291 error
= nfs4_path_walk(server
, mntfh
, data
->mnt_path
);
1295 /* probe the filesystem info for this server filesystem */
1296 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1300 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1301 server
->namelen
= NFS4_MAXNAMLEN
;
1303 dprintk("Referral FSID: %llx:%llx\n",
1304 (unsigned long long) server
->fsid
.major
,
1305 (unsigned long long) server
->fsid
.minor
);
1307 spin_lock(&nfs_client_lock
);
1308 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1309 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1310 spin_unlock(&nfs_client_lock
);
1312 server
->mount_time
= jiffies
;
1314 dprintk("<-- nfs_create_referral_server() = %p\n", server
);
1318 nfs_free_server(server
);
1319 dprintk("<-- nfs4_create_referral_server() = error %d\n", error
);
1320 return ERR_PTR(error
);
1323 #endif /* CONFIG_NFS_V4 */
1326 * Clone an NFS2, NFS3 or NFS4 server record
1328 struct nfs_server
*nfs_clone_server(struct nfs_server
*source
,
1330 struct nfs_fattr
*fattr
)
1332 struct nfs_server
*server
;
1333 struct nfs_fattr fattr_fsinfo
;
1336 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1337 (unsigned long long) fattr
->fsid
.major
,
1338 (unsigned long long) fattr
->fsid
.minor
);
1340 server
= nfs_alloc_server();
1342 return ERR_PTR(-ENOMEM
);
1344 /* Copy data from the source */
1345 server
->nfs_client
= source
->nfs_client
;
1346 atomic_inc(&server
->nfs_client
->cl_count
);
1347 nfs_server_copy_userdata(server
, source
);
1349 server
->fsid
= fattr
->fsid
;
1351 error
= nfs_init_server_rpcclient(server
,
1352 source
->client
->cl_timeout
,
1353 source
->client
->cl_auth
->au_flavor
);
1355 goto out_free_server
;
1356 if (!IS_ERR(source
->client_acl
))
1357 nfs_init_server_aclclient(server
);
1359 /* probe the filesystem info for this server filesystem */
1360 error
= nfs_probe_fsinfo(server
, fh
, &fattr_fsinfo
);
1362 goto out_free_server
;
1364 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1365 server
->namelen
= NFS4_MAXNAMLEN
;
1367 dprintk("Cloned FSID: %llx:%llx\n",
1368 (unsigned long long) server
->fsid
.major
,
1369 (unsigned long long) server
->fsid
.minor
);
1371 error
= nfs_start_lockd(server
);
1373 goto out_free_server
;
1375 spin_lock(&nfs_client_lock
);
1376 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1377 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1378 spin_unlock(&nfs_client_lock
);
1380 server
->mount_time
= jiffies
;
1382 dprintk("<-- nfs_clone_server() = %p\n", server
);
1386 nfs_free_server(server
);
1387 dprintk("<-- nfs_clone_server() = error %d\n", error
);
1388 return ERR_PTR(error
);
1391 #ifdef CONFIG_PROC_FS
1392 static struct proc_dir_entry
*proc_fs_nfs
;
1394 static int nfs_server_list_open(struct inode
*inode
, struct file
*file
);
1395 static void *nfs_server_list_start(struct seq_file
*p
, loff_t
*pos
);
1396 static void *nfs_server_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
);
1397 static void nfs_server_list_stop(struct seq_file
*p
, void *v
);
1398 static int nfs_server_list_show(struct seq_file
*m
, void *v
);
1400 static struct seq_operations nfs_server_list_ops
= {
1401 .start
= nfs_server_list_start
,
1402 .next
= nfs_server_list_next
,
1403 .stop
= nfs_server_list_stop
,
1404 .show
= nfs_server_list_show
,
1407 static const struct file_operations nfs_server_list_fops
= {
1408 .open
= nfs_server_list_open
,
1410 .llseek
= seq_lseek
,
1411 .release
= seq_release
,
1412 .owner
= THIS_MODULE
,
1415 static int nfs_volume_list_open(struct inode
*inode
, struct file
*file
);
1416 static void *nfs_volume_list_start(struct seq_file
*p
, loff_t
*pos
);
1417 static void *nfs_volume_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
);
1418 static void nfs_volume_list_stop(struct seq_file
*p
, void *v
);
1419 static int nfs_volume_list_show(struct seq_file
*m
, void *v
);
1421 static struct seq_operations nfs_volume_list_ops
= {
1422 .start
= nfs_volume_list_start
,
1423 .next
= nfs_volume_list_next
,
1424 .stop
= nfs_volume_list_stop
,
1425 .show
= nfs_volume_list_show
,
1428 static const struct file_operations nfs_volume_list_fops
= {
1429 .open
= nfs_volume_list_open
,
1431 .llseek
= seq_lseek
,
1432 .release
= seq_release
,
1433 .owner
= THIS_MODULE
,
1437 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1440 static int nfs_server_list_open(struct inode
*inode
, struct file
*file
)
1445 ret
= seq_open(file
, &nfs_server_list_ops
);
1449 m
= file
->private_data
;
1450 m
->private = PDE(inode
)->data
;
1456 * set up the iterator to start reading from the server list and return the first item
1458 static void *nfs_server_list_start(struct seq_file
*m
, loff_t
*_pos
)
1460 /* lock the list against modification */
1461 spin_lock(&nfs_client_lock
);
1462 return seq_list_start_head(&nfs_client_list
, *_pos
);
1466 * move to next server
1468 static void *nfs_server_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
)
1470 return seq_list_next(v
, &nfs_client_list
, pos
);
1474 * clean up after reading from the transports list
1476 static void nfs_server_list_stop(struct seq_file
*p
, void *v
)
1478 spin_unlock(&nfs_client_lock
);
1482 * display a header line followed by a load of call lines
1484 static int nfs_server_list_show(struct seq_file
*m
, void *v
)
1486 struct nfs_client
*clp
;
1488 /* display header on line 1 */
1489 if (v
== &nfs_client_list
) {
1490 seq_puts(m
, "NV SERVER PORT USE HOSTNAME\n");
1494 /* display one transport per line on subsequent lines */
1495 clp
= list_entry(v
, struct nfs_client
, cl_share_link
);
1497 seq_printf(m
, "v%u %s %s %3d %s\n",
1498 clp
->rpc_ops
->version
,
1499 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_ADDR
),
1500 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_PORT
),
1501 atomic_read(&clp
->cl_count
),
1508 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1510 static int nfs_volume_list_open(struct inode
*inode
, struct file
*file
)
1515 ret
= seq_open(file
, &nfs_volume_list_ops
);
1519 m
= file
->private_data
;
1520 m
->private = PDE(inode
)->data
;
1526 * set up the iterator to start reading from the volume list and return the first item
1528 static void *nfs_volume_list_start(struct seq_file
*m
, loff_t
*_pos
)
1530 /* lock the list against modification */
1531 spin_lock(&nfs_client_lock
);
1532 return seq_list_start_head(&nfs_volume_list
, *_pos
);
1536 * move to next volume
1538 static void *nfs_volume_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
)
1540 return seq_list_next(v
, &nfs_volume_list
, pos
);
1544 * clean up after reading from the transports list
1546 static void nfs_volume_list_stop(struct seq_file
*p
, void *v
)
1548 spin_unlock(&nfs_client_lock
);
1552 * display a header line followed by a load of call lines
1554 static int nfs_volume_list_show(struct seq_file
*m
, void *v
)
1556 struct nfs_server
*server
;
1557 struct nfs_client
*clp
;
1558 char dev
[8], fsid
[17];
1560 /* display header on line 1 */
1561 if (v
== &nfs_volume_list
) {
1562 seq_puts(m
, "NV SERVER PORT DEV FSID\n");
1565 /* display one transport per line on subsequent lines */
1566 server
= list_entry(v
, struct nfs_server
, master_link
);
1567 clp
= server
->nfs_client
;
1569 snprintf(dev
, 8, "%u:%u",
1570 MAJOR(server
->s_dev
), MINOR(server
->s_dev
));
1572 snprintf(fsid
, 17, "%llx:%llx",
1573 (unsigned long long) server
->fsid
.major
,
1574 (unsigned long long) server
->fsid
.minor
);
1576 seq_printf(m
, "v%u %s %s %-7s %-17s\n",
1577 clp
->rpc_ops
->version
,
1578 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_ADDR
),
1579 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_PORT
),
1587 * initialise the /proc/fs/nfsfs/ directory
1589 int __init
nfs_fs_proc_init(void)
1591 struct proc_dir_entry
*p
;
1593 proc_fs_nfs
= proc_mkdir("fs/nfsfs", NULL
);
1597 /* a file of servers with which we're dealing */
1598 p
= proc_create("servers", S_IFREG
|S_IRUGO
,
1599 proc_fs_nfs
, &nfs_server_list_fops
);
1603 /* a file of volumes that we have mounted */
1604 p
= proc_create("volumes", S_IFREG
|S_IRUGO
,
1605 proc_fs_nfs
, &nfs_volume_list_fops
);
1611 remove_proc_entry("servers", proc_fs_nfs
);
1613 remove_proc_entry("fs/nfsfs", NULL
);
1619 * clean up the /proc/fs/nfsfs/ directory
1621 void nfs_fs_proc_exit(void)
1623 remove_proc_entry("volumes", proc_fs_nfs
);
1624 remove_proc_entry("servers", proc_fs_nfs
);
1625 remove_proc_entry("fs/nfsfs", NULL
);
1628 #endif /* CONFIG_PROC_FS */