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
);
260 * Test if two ip6 socket addresses refer to the same socket by
261 * comparing relevant fields. The padding bytes specifically, are not
262 * compared. sin6_flowinfo is not compared because it only affects QoS
263 * and sin6_scope_id is only compared if the address is "link local"
264 * because "link local" addresses need only be unique to a specific
265 * link. Conversely, ordinary unicast addresses might have different
268 * The caller should ensure both socket addresses are AF_INET6.
270 static int nfs_sockaddr_cmp_ip6(const struct sockaddr
*sa1
,
271 const struct sockaddr
*sa2
)
273 const struct sockaddr_in6
*saddr1
= (const struct sockaddr_in6
*)sa1
;
274 const struct sockaddr_in6
*saddr2
= (const struct sockaddr_in6
*)sa2
;
276 if (!ipv6_addr_equal(&saddr1
->sin6_addr
,
279 if (ipv6_addr_scope(&saddr1
->sin6_addr
) == IPV6_ADDR_SCOPE_LINKLOCAL
&&
280 saddr1
->sin6_scope_id
!= saddr2
->sin6_scope_id
)
282 return saddr1
->sin6_port
== saddr2
->sin6_port
;
285 static int nfs_sockaddr_match_ipaddr4(const struct sockaddr_in
*sa1
,
286 const struct sockaddr_in
*sa2
)
288 return sa1
->sin_addr
.s_addr
== sa2
->sin_addr
.s_addr
;
291 static int nfs_sockaddr_match_ipaddr(const struct sockaddr
*sa1
,
292 const struct sockaddr
*sa2
)
294 if (unlikely(sa1
->sa_family
!= AF_INET
|| sa2
->sa_family
!= AF_INET
))
296 return nfs_sockaddr_match_ipaddr4((const struct sockaddr_in
*)sa1
,
297 (const struct sockaddr_in
*)sa2
);
300 static int nfs_sockaddr_cmp_ip6(const struct sockaddr
* sa1
,
301 const struct sockaddr
* sa2
)
308 * Test if two ip4 socket addresses refer to the same socket, by
309 * comparing relevant fields. The padding bytes specifically, are
312 * The caller should ensure both socket addresses are AF_INET.
314 static int nfs_sockaddr_cmp_ip4(const struct sockaddr
*sa1
,
315 const struct sockaddr
*sa2
)
317 const struct sockaddr_in
*saddr1
= (const struct sockaddr_in
*)sa1
;
318 const struct sockaddr_in
*saddr2
= (const struct sockaddr_in
*)sa2
;
320 if (saddr1
->sin_addr
.s_addr
!= saddr2
->sin_addr
.s_addr
)
322 return saddr1
->sin_port
== saddr2
->sin_port
;
326 * Test if two socket addresses represent the same actual socket,
327 * by comparing (only) relevant fields.
329 static int nfs_sockaddr_cmp(const struct sockaddr
*sa1
,
330 const struct sockaddr
*sa2
)
332 if (sa1
->sa_family
!= sa2
->sa_family
)
335 switch (sa1
->sa_family
) {
337 return nfs_sockaddr_cmp_ip4(sa1
, sa2
);
339 return nfs_sockaddr_cmp_ip6(sa1
, sa2
);
345 * Find a client by IP address and protocol version
346 * - returns NULL if no such client
348 struct nfs_client
*nfs_find_client(const struct sockaddr
*addr
, u32 nfsversion
)
350 struct nfs_client
*clp
;
352 spin_lock(&nfs_client_lock
);
353 list_for_each_entry(clp
, &nfs_client_list
, cl_share_link
) {
354 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
356 /* Don't match clients that failed to initialise properly */
357 if (clp
->cl_cons_state
!= NFS_CS_READY
)
360 /* Different NFS versions cannot share the same nfs_client */
361 if (clp
->rpc_ops
->version
!= nfsversion
)
364 /* Match only the IP address, not the port number */
365 if (!nfs_sockaddr_match_ipaddr(addr
, clap
))
368 atomic_inc(&clp
->cl_count
);
369 spin_unlock(&nfs_client_lock
);
372 spin_unlock(&nfs_client_lock
);
377 * Find a client by IP address and protocol version
378 * - returns NULL if no such client
380 struct nfs_client
*nfs_find_client_next(struct nfs_client
*clp
)
382 struct sockaddr
*sap
= (struct sockaddr
*)&clp
->cl_addr
;
383 u32 nfsvers
= clp
->rpc_ops
->version
;
385 spin_lock(&nfs_client_lock
);
386 list_for_each_entry_continue(clp
, &nfs_client_list
, cl_share_link
) {
387 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
389 /* Don't match clients that failed to initialise properly */
390 if (clp
->cl_cons_state
!= NFS_CS_READY
)
393 /* Different NFS versions cannot share the same nfs_client */
394 if (clp
->rpc_ops
->version
!= nfsvers
)
397 /* Match only the IP address, not the port number */
398 if (!nfs_sockaddr_match_ipaddr(sap
, clap
))
401 atomic_inc(&clp
->cl_count
);
402 spin_unlock(&nfs_client_lock
);
405 spin_unlock(&nfs_client_lock
);
410 * Find an nfs_client on the list that matches the initialisation data
413 static struct nfs_client
*nfs_match_client(const struct nfs_client_initdata
*data
)
415 struct nfs_client
*clp
;
416 const struct sockaddr
*sap
= data
->addr
;
418 list_for_each_entry(clp
, &nfs_client_list
, cl_share_link
) {
419 const struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
420 /* Don't match clients that failed to initialise properly */
421 if (clp
->cl_cons_state
< 0)
424 /* Different NFS versions cannot share the same nfs_client */
425 if (clp
->rpc_ops
!= data
->rpc_ops
)
428 if (clp
->cl_proto
!= data
->proto
)
431 /* Match the full socket address */
432 if (!nfs_sockaddr_cmp(sap
, clap
))
435 atomic_inc(&clp
->cl_count
);
442 * Look up a client by IP address and protocol version
443 * - creates a new record if one doesn't yet exist
445 static struct nfs_client
*nfs_get_client(const struct nfs_client_initdata
*cl_init
)
447 struct nfs_client
*clp
, *new = NULL
;
450 dprintk("--> nfs_get_client(%s,v%u)\n",
451 cl_init
->hostname
?: "", cl_init
->rpc_ops
->version
);
453 /* see if the client already exists */
455 spin_lock(&nfs_client_lock
);
457 clp
= nfs_match_client(cl_init
);
463 spin_unlock(&nfs_client_lock
);
465 new = nfs_alloc_client(cl_init
);
468 return ERR_PTR(-ENOMEM
);
470 /* install a new client and return with it unready */
473 list_add(&clp
->cl_share_link
, &nfs_client_list
);
474 spin_unlock(&nfs_client_lock
);
475 dprintk("--> nfs_get_client() = %p [new]\n", clp
);
478 /* found an existing client
479 * - make sure it's ready before returning
482 spin_unlock(&nfs_client_lock
);
485 nfs_free_client(new);
487 error
= wait_event_killable(nfs_client_active_wq
,
488 clp
->cl_cons_state
!= NFS_CS_INITING
);
491 return ERR_PTR(-ERESTARTSYS
);
494 if (clp
->cl_cons_state
< NFS_CS_READY
) {
495 error
= clp
->cl_cons_state
;
497 return ERR_PTR(error
);
500 BUG_ON(clp
->cl_cons_state
!= NFS_CS_READY
);
502 dprintk("--> nfs_get_client() = %p [share]\n", clp
);
507 * Mark a server as ready or failed
509 static void nfs_mark_client_ready(struct nfs_client
*clp
, int state
)
511 clp
->cl_cons_state
= state
;
512 wake_up_all(&nfs_client_active_wq
);
516 * Initialise the timeout values for a connection
518 static void nfs_init_timeout_values(struct rpc_timeout
*to
, int proto
,
519 unsigned int timeo
, unsigned int retrans
)
521 to
->to_initval
= timeo
* HZ
/ 10;
522 to
->to_retries
= retrans
;
525 case XPRT_TRANSPORT_TCP
:
526 case XPRT_TRANSPORT_RDMA
:
527 if (to
->to_retries
== 0)
528 to
->to_retries
= NFS_DEF_TCP_RETRANS
;
529 if (to
->to_initval
== 0)
530 to
->to_initval
= NFS_DEF_TCP_TIMEO
* HZ
/ 10;
531 if (to
->to_initval
> NFS_MAX_TCP_TIMEOUT
)
532 to
->to_initval
= NFS_MAX_TCP_TIMEOUT
;
533 to
->to_increment
= to
->to_initval
;
534 to
->to_maxval
= to
->to_initval
+ (to
->to_increment
* to
->to_retries
);
535 if (to
->to_maxval
> NFS_MAX_TCP_TIMEOUT
)
536 to
->to_maxval
= NFS_MAX_TCP_TIMEOUT
;
537 if (to
->to_maxval
< to
->to_initval
)
538 to
->to_maxval
= to
->to_initval
;
539 to
->to_exponential
= 0;
541 case XPRT_TRANSPORT_UDP
:
542 if (to
->to_retries
== 0)
543 to
->to_retries
= NFS_DEF_UDP_RETRANS
;
545 to
->to_initval
= NFS_DEF_UDP_TIMEO
* HZ
/ 10;
546 if (to
->to_initval
> NFS_MAX_UDP_TIMEOUT
)
547 to
->to_initval
= NFS_MAX_UDP_TIMEOUT
;
548 to
->to_maxval
= NFS_MAX_UDP_TIMEOUT
;
549 to
->to_exponential
= 1;
557 * Create an RPC client handle
559 static int nfs_create_rpc_client(struct nfs_client
*clp
,
560 const struct rpc_timeout
*timeparms
,
561 rpc_authflavor_t flavor
,
562 int discrtry
, int noresvport
)
564 struct rpc_clnt
*clnt
= NULL
;
565 struct rpc_create_args args
= {
566 .protocol
= clp
->cl_proto
,
567 .address
= (struct sockaddr
*)&clp
->cl_addr
,
568 .addrsize
= clp
->cl_addrlen
,
569 .timeout
= timeparms
,
570 .servername
= clp
->cl_hostname
,
571 .program
= &nfs_program
,
572 .version
= clp
->rpc_ops
->version
,
573 .authflavor
= flavor
,
577 args
.flags
|= RPC_CLNT_CREATE_DISCRTRY
;
579 args
.flags
|= RPC_CLNT_CREATE_NONPRIVPORT
;
581 if (!IS_ERR(clp
->cl_rpcclient
))
584 clnt
= rpc_create(&args
);
586 dprintk("%s: cannot create RPC client. Error = %ld\n",
587 __func__
, PTR_ERR(clnt
));
588 return PTR_ERR(clnt
);
591 clp
->cl_rpcclient
= clnt
;
596 * Version 2 or 3 client destruction
598 static void nfs_destroy_server(struct nfs_server
*server
)
600 if (!(server
->flags
& NFS_MOUNT_NONLM
))
601 nlmclnt_done(server
->nlm_host
);
605 * Version 2 or 3 lockd setup
607 static int nfs_start_lockd(struct nfs_server
*server
)
609 struct nlm_host
*host
;
610 struct nfs_client
*clp
= server
->nfs_client
;
611 struct nlmclnt_initdata nlm_init
= {
612 .hostname
= clp
->cl_hostname
,
613 .address
= (struct sockaddr
*)&clp
->cl_addr
,
614 .addrlen
= clp
->cl_addrlen
,
615 .protocol
= server
->flags
& NFS_MOUNT_TCP
?
616 IPPROTO_TCP
: IPPROTO_UDP
,
617 .nfs_version
= clp
->rpc_ops
->version
,
618 .noresvport
= server
->flags
& NFS_MOUNT_NORESVPORT
?
622 if (nlm_init
.nfs_version
> 3)
624 if (server
->flags
& NFS_MOUNT_NONLM
)
627 host
= nlmclnt_init(&nlm_init
);
629 return PTR_ERR(host
);
631 server
->nlm_host
= host
;
632 server
->destroy
= nfs_destroy_server
;
637 * Initialise an NFSv3 ACL client connection
639 #ifdef CONFIG_NFS_V3_ACL
640 static void nfs_init_server_aclclient(struct nfs_server
*server
)
642 if (server
->nfs_client
->rpc_ops
->version
!= 3)
644 if (server
->flags
& NFS_MOUNT_NOACL
)
647 server
->client_acl
= rpc_bind_new_program(server
->client
, &nfsacl_program
, 3);
648 if (IS_ERR(server
->client_acl
))
651 /* No errors! Assume that Sun nfsacls are supported */
652 server
->caps
|= NFS_CAP_ACLS
;
656 server
->caps
&= ~NFS_CAP_ACLS
;
659 static inline void nfs_init_server_aclclient(struct nfs_server
*server
)
661 server
->flags
&= ~NFS_MOUNT_NOACL
;
662 server
->caps
&= ~NFS_CAP_ACLS
;
667 * Create a general RPC client
669 static int nfs_init_server_rpcclient(struct nfs_server
*server
,
670 const struct rpc_timeout
*timeo
,
671 rpc_authflavor_t pseudoflavour
)
673 struct nfs_client
*clp
= server
->nfs_client
;
675 server
->client
= rpc_clone_client(clp
->cl_rpcclient
);
676 if (IS_ERR(server
->client
)) {
677 dprintk("%s: couldn't create rpc_client!\n", __func__
);
678 return PTR_ERR(server
->client
);
681 memcpy(&server
->client
->cl_timeout_default
,
683 sizeof(server
->client
->cl_timeout_default
));
684 server
->client
->cl_timeout
= &server
->client
->cl_timeout_default
;
686 if (pseudoflavour
!= clp
->cl_rpcclient
->cl_auth
->au_flavor
) {
687 struct rpc_auth
*auth
;
689 auth
= rpcauth_create(pseudoflavour
, server
->client
);
691 dprintk("%s: couldn't create credcache!\n", __func__
);
692 return PTR_ERR(auth
);
695 server
->client
->cl_softrtry
= 0;
696 if (server
->flags
& NFS_MOUNT_SOFT
)
697 server
->client
->cl_softrtry
= 1;
703 * Initialise an NFS2 or NFS3 client
705 static int nfs_init_client(struct nfs_client
*clp
,
706 const struct rpc_timeout
*timeparms
,
707 const struct nfs_parsed_mount_data
*data
)
711 if (clp
->cl_cons_state
== NFS_CS_READY
) {
712 /* the client is already initialised */
713 dprintk("<-- nfs_init_client() = 0 [already %p]\n", clp
);
718 * Create a client RPC handle for doing FSSTAT with UNIX auth only
719 * - RFC 2623, sec 2.3.2
721 error
= nfs_create_rpc_client(clp
, timeparms
, RPC_AUTH_UNIX
,
722 0, data
->flags
& NFS_MOUNT_NORESVPORT
);
725 nfs_mark_client_ready(clp
, NFS_CS_READY
);
729 nfs_mark_client_ready(clp
, error
);
730 dprintk("<-- nfs_init_client() = xerror %d\n", error
);
735 * Create a version 2 or 3 client
737 static int nfs_init_server(struct nfs_server
*server
,
738 const struct nfs_parsed_mount_data
*data
)
740 struct nfs_client_initdata cl_init
= {
741 .hostname
= data
->nfs_server
.hostname
,
742 .addr
= (const struct sockaddr
*)&data
->nfs_server
.address
,
743 .addrlen
= data
->nfs_server
.addrlen
,
744 .rpc_ops
= &nfs_v2_clientops
,
745 .proto
= data
->nfs_server
.protocol
,
747 struct rpc_timeout timeparms
;
748 struct nfs_client
*clp
;
751 dprintk("--> nfs_init_server()\n");
754 if (data
->flags
& NFS_MOUNT_VER3
)
755 cl_init
.rpc_ops
= &nfs_v3_clientops
;
758 /* Allocate or find a client reference we can use */
759 clp
= nfs_get_client(&cl_init
);
761 dprintk("<-- nfs_init_server() = error %ld\n", PTR_ERR(clp
));
765 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
766 data
->timeo
, data
->retrans
);
767 error
= nfs_init_client(clp
, &timeparms
, data
);
771 server
->nfs_client
= clp
;
773 /* Initialise the client representation from the mount data */
774 server
->flags
= data
->flags
;
777 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
779 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
781 server
->acregmin
= data
->acregmin
* HZ
;
782 server
->acregmax
= data
->acregmax
* HZ
;
783 server
->acdirmin
= data
->acdirmin
* HZ
;
784 server
->acdirmax
= data
->acdirmax
* HZ
;
786 /* Start lockd here, before we might error out */
787 error
= nfs_start_lockd(server
);
791 server
->port
= data
->nfs_server
.port
;
793 error
= nfs_init_server_rpcclient(server
, &timeparms
, data
->auth_flavors
[0]);
797 /* Preserve the values of mount_server-related mount options */
798 if (data
->mount_server
.addrlen
) {
799 memcpy(&server
->mountd_address
, &data
->mount_server
.address
,
800 data
->mount_server
.addrlen
);
801 server
->mountd_addrlen
= data
->mount_server
.addrlen
;
803 server
->mountd_version
= data
->mount_server
.version
;
804 server
->mountd_port
= data
->mount_server
.port
;
805 server
->mountd_protocol
= data
->mount_server
.protocol
;
807 server
->namelen
= data
->namlen
;
808 /* Create a client RPC handle for the NFSv3 ACL management interface */
809 nfs_init_server_aclclient(server
);
810 dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp
);
814 server
->nfs_client
= NULL
;
816 dprintk("<-- nfs_init_server() = xerror %d\n", error
);
821 * Load up the server record from information gained in an fsinfo record
823 static void nfs_server_set_fsinfo(struct nfs_server
*server
, struct nfs_fsinfo
*fsinfo
)
825 unsigned long max_rpc_payload
;
827 /* Work out a lot of parameters */
828 if (server
->rsize
== 0)
829 server
->rsize
= nfs_block_size(fsinfo
->rtpref
, NULL
);
830 if (server
->wsize
== 0)
831 server
->wsize
= nfs_block_size(fsinfo
->wtpref
, NULL
);
833 if (fsinfo
->rtmax
>= 512 && server
->rsize
> fsinfo
->rtmax
)
834 server
->rsize
= nfs_block_size(fsinfo
->rtmax
, NULL
);
835 if (fsinfo
->wtmax
>= 512 && server
->wsize
> fsinfo
->wtmax
)
836 server
->wsize
= nfs_block_size(fsinfo
->wtmax
, NULL
);
838 max_rpc_payload
= nfs_block_size(rpc_max_payload(server
->client
), NULL
);
839 if (server
->rsize
> max_rpc_payload
)
840 server
->rsize
= max_rpc_payload
;
841 if (server
->rsize
> NFS_MAX_FILE_IO_SIZE
)
842 server
->rsize
= NFS_MAX_FILE_IO_SIZE
;
843 server
->rpages
= (server
->rsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
845 server
->backing_dev_info
.ra_pages
= server
->rpages
* NFS_MAX_READAHEAD
;
847 if (server
->wsize
> max_rpc_payload
)
848 server
->wsize
= max_rpc_payload
;
849 if (server
->wsize
> NFS_MAX_FILE_IO_SIZE
)
850 server
->wsize
= NFS_MAX_FILE_IO_SIZE
;
851 server
->wpages
= (server
->wsize
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
852 server
->wtmult
= nfs_block_bits(fsinfo
->wtmult
, NULL
);
854 server
->dtsize
= nfs_block_size(fsinfo
->dtpref
, NULL
);
855 if (server
->dtsize
> PAGE_CACHE_SIZE
)
856 server
->dtsize
= PAGE_CACHE_SIZE
;
857 if (server
->dtsize
> server
->rsize
)
858 server
->dtsize
= server
->rsize
;
860 if (server
->flags
& NFS_MOUNT_NOAC
) {
861 server
->acregmin
= server
->acregmax
= 0;
862 server
->acdirmin
= server
->acdirmax
= 0;
865 server
->maxfilesize
= fsinfo
->maxfilesize
;
867 /* We're airborne Set socket buffersize */
868 rpc_setbufsize(server
->client
, server
->wsize
+ 100, server
->rsize
+ 100);
872 * Probe filesystem information, including the FSID on v2/v3
874 static int nfs_probe_fsinfo(struct nfs_server
*server
, struct nfs_fh
*mntfh
, struct nfs_fattr
*fattr
)
876 struct nfs_fsinfo fsinfo
;
877 struct nfs_client
*clp
= server
->nfs_client
;
880 dprintk("--> nfs_probe_fsinfo()\n");
882 if (clp
->rpc_ops
->set_capabilities
!= NULL
) {
883 error
= clp
->rpc_ops
->set_capabilities(server
, mntfh
);
888 fsinfo
.fattr
= fattr
;
889 nfs_fattr_init(fattr
);
890 error
= clp
->rpc_ops
->fsinfo(server
, mntfh
, &fsinfo
);
894 nfs_server_set_fsinfo(server
, &fsinfo
);
895 error
= bdi_init(&server
->backing_dev_info
);
900 /* Get some general file system info */
901 if (server
->namelen
== 0) {
902 struct nfs_pathconf pathinfo
;
904 pathinfo
.fattr
= fattr
;
905 nfs_fattr_init(fattr
);
907 if (clp
->rpc_ops
->pathconf(server
, mntfh
, &pathinfo
) >= 0)
908 server
->namelen
= pathinfo
.max_namelen
;
911 dprintk("<-- nfs_probe_fsinfo() = 0\n");
915 dprintk("nfs_probe_fsinfo: error = %d\n", -error
);
920 * Copy useful information when duplicating a server record
922 static void nfs_server_copy_userdata(struct nfs_server
*target
, struct nfs_server
*source
)
924 target
->flags
= source
->flags
;
925 target
->acregmin
= source
->acregmin
;
926 target
->acregmax
= source
->acregmax
;
927 target
->acdirmin
= source
->acdirmin
;
928 target
->acdirmax
= source
->acdirmax
;
929 target
->caps
= source
->caps
;
933 * Allocate and initialise a server record
935 static struct nfs_server
*nfs_alloc_server(void)
937 struct nfs_server
*server
;
939 server
= kzalloc(sizeof(struct nfs_server
), GFP_KERNEL
);
943 server
->client
= server
->client_acl
= ERR_PTR(-EINVAL
);
945 /* Zero out the NFS state stuff */
946 INIT_LIST_HEAD(&server
->client_link
);
947 INIT_LIST_HEAD(&server
->master_link
);
949 atomic_set(&server
->active
, 0);
951 server
->io_stats
= nfs_alloc_iostats();
952 if (!server
->io_stats
) {
961 * Free up a server record
963 void nfs_free_server(struct nfs_server
*server
)
965 dprintk("--> nfs_free_server()\n");
967 spin_lock(&nfs_client_lock
);
968 list_del(&server
->client_link
);
969 list_del(&server
->master_link
);
970 spin_unlock(&nfs_client_lock
);
972 if (server
->destroy
!= NULL
)
973 server
->destroy(server
);
975 if (!IS_ERR(server
->client_acl
))
976 rpc_shutdown_client(server
->client_acl
);
977 if (!IS_ERR(server
->client
))
978 rpc_shutdown_client(server
->client
);
980 nfs_put_client(server
->nfs_client
);
982 nfs_free_iostats(server
->io_stats
);
983 bdi_destroy(&server
->backing_dev_info
);
985 nfs_release_automount_timer();
986 dprintk("<-- nfs_free_server()\n");
990 * Create a version 2 or 3 volume record
991 * - keyed on server and FSID
993 struct nfs_server
*nfs_create_server(const struct nfs_parsed_mount_data
*data
,
994 struct nfs_fh
*mntfh
)
996 struct nfs_server
*server
;
997 struct nfs_fattr fattr
;
1000 server
= nfs_alloc_server();
1002 return ERR_PTR(-ENOMEM
);
1004 /* Get a client representation */
1005 error
= nfs_init_server(server
, data
);
1009 BUG_ON(!server
->nfs_client
);
1010 BUG_ON(!server
->nfs_client
->rpc_ops
);
1011 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1013 /* Probe the root fh to retrieve its FSID */
1014 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1017 if (server
->nfs_client
->rpc_ops
->version
== 3) {
1018 if (server
->namelen
== 0 || server
->namelen
> NFS3_MAXNAMLEN
)
1019 server
->namelen
= NFS3_MAXNAMLEN
;
1020 if (!(data
->flags
& NFS_MOUNT_NORDIRPLUS
))
1021 server
->caps
|= NFS_CAP_READDIRPLUS
;
1023 if (server
->namelen
== 0 || server
->namelen
> NFS2_MAXNAMLEN
)
1024 server
->namelen
= NFS2_MAXNAMLEN
;
1027 if (!(fattr
.valid
& NFS_ATTR_FATTR
)) {
1028 error
= server
->nfs_client
->rpc_ops
->getattr(server
, mntfh
, &fattr
);
1030 dprintk("nfs_create_server: getattr error = %d\n", -error
);
1034 memcpy(&server
->fsid
, &fattr
.fsid
, sizeof(server
->fsid
));
1036 dprintk("Server FSID: %llx:%llx\n",
1037 (unsigned long long) server
->fsid
.major
,
1038 (unsigned long long) server
->fsid
.minor
);
1040 BUG_ON(!server
->nfs_client
);
1041 BUG_ON(!server
->nfs_client
->rpc_ops
);
1042 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1044 spin_lock(&nfs_client_lock
);
1045 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1046 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1047 spin_unlock(&nfs_client_lock
);
1049 server
->mount_time
= jiffies
;
1053 nfs_free_server(server
);
1054 return ERR_PTR(error
);
1057 #ifdef CONFIG_NFS_V4
1059 * Initialise an NFS4 client record
1061 static int nfs4_init_client(struct nfs_client
*clp
,
1062 const struct rpc_timeout
*timeparms
,
1063 const char *ip_addr
,
1064 rpc_authflavor_t authflavour
,
1069 if (clp
->cl_cons_state
== NFS_CS_READY
) {
1070 /* the client is initialised already */
1071 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp
);
1075 /* Check NFS protocol revision and initialize RPC op vector */
1076 clp
->rpc_ops
= &nfs_v4_clientops
;
1078 error
= nfs_create_rpc_client(clp
, timeparms
, authflavour
,
1079 1, flags
& NFS_MOUNT_NORESVPORT
);
1082 memcpy(clp
->cl_ipaddr
, ip_addr
, sizeof(clp
->cl_ipaddr
));
1084 error
= nfs_idmap_new(clp
);
1086 dprintk("%s: failed to create idmapper. Error = %d\n",
1090 __set_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
);
1092 nfs_mark_client_ready(clp
, NFS_CS_READY
);
1096 nfs_mark_client_ready(clp
, error
);
1097 dprintk("<-- nfs4_init_client() = xerror %d\n", error
);
1102 * Set up an NFS4 client
1104 static int nfs4_set_client(struct nfs_server
*server
,
1105 const char *hostname
,
1106 const struct sockaddr
*addr
,
1107 const size_t addrlen
,
1108 const char *ip_addr
,
1109 rpc_authflavor_t authflavour
,
1110 int proto
, const struct rpc_timeout
*timeparms
)
1112 struct nfs_client_initdata cl_init
= {
1113 .hostname
= hostname
,
1116 .rpc_ops
= &nfs_v4_clientops
,
1119 struct nfs_client
*clp
;
1122 dprintk("--> nfs4_set_client()\n");
1124 /* Allocate or find a client reference we can use */
1125 clp
= nfs_get_client(&cl_init
);
1127 error
= PTR_ERR(clp
);
1130 error
= nfs4_init_client(clp
, timeparms
, ip_addr
, authflavour
,
1135 server
->nfs_client
= clp
;
1136 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp
);
1140 nfs_put_client(clp
);
1142 dprintk("<-- nfs4_set_client() = xerror %d\n", error
);
1147 * Create a version 4 volume record
1149 static int nfs4_init_server(struct nfs_server
*server
,
1150 const struct nfs_parsed_mount_data
*data
)
1152 struct rpc_timeout timeparms
;
1155 dprintk("--> nfs4_init_server()\n");
1157 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
1158 data
->timeo
, data
->retrans
);
1160 /* Initialise the client representation from the mount data */
1161 server
->flags
= data
->flags
;
1162 server
->caps
|= NFS_CAP_ATOMIC_OPEN
;
1164 /* Get a client record */
1165 error
= nfs4_set_client(server
,
1166 data
->nfs_server
.hostname
,
1167 (const struct sockaddr
*)&data
->nfs_server
.address
,
1168 data
->nfs_server
.addrlen
,
1169 data
->client_address
,
1170 data
->auth_flavors
[0],
1171 data
->nfs_server
.protocol
,
1177 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
1179 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
1181 server
->acregmin
= data
->acregmin
* HZ
;
1182 server
->acregmax
= data
->acregmax
* HZ
;
1183 server
->acdirmin
= data
->acdirmin
* HZ
;
1184 server
->acdirmax
= data
->acdirmax
* HZ
;
1186 server
->port
= data
->nfs_server
.port
;
1188 error
= nfs_init_server_rpcclient(server
, &timeparms
, data
->auth_flavors
[0]);
1192 dprintk("<-- nfs4_init_server() = %d\n", error
);
1197 * Create a version 4 volume record
1198 * - keyed on server and FSID
1200 struct nfs_server
*nfs4_create_server(const struct nfs_parsed_mount_data
*data
,
1201 struct nfs_fh
*mntfh
)
1203 struct nfs_fattr fattr
;
1204 struct nfs_server
*server
;
1207 dprintk("--> nfs4_create_server()\n");
1209 server
= nfs_alloc_server();
1211 return ERR_PTR(-ENOMEM
);
1213 /* set up the general RPC client */
1214 error
= nfs4_init_server(server
, data
);
1218 BUG_ON(!server
->nfs_client
);
1219 BUG_ON(!server
->nfs_client
->rpc_ops
);
1220 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1222 /* Probe the root fh to retrieve its FSID */
1223 error
= nfs4_path_walk(server
, mntfh
, data
->nfs_server
.export_path
);
1227 dprintk("Server FSID: %llx:%llx\n",
1228 (unsigned long long) server
->fsid
.major
,
1229 (unsigned long long) server
->fsid
.minor
);
1230 dprintk("Mount FH: %d\n", mntfh
->size
);
1232 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1236 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1237 server
->namelen
= NFS4_MAXNAMLEN
;
1239 BUG_ON(!server
->nfs_client
);
1240 BUG_ON(!server
->nfs_client
->rpc_ops
);
1241 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1243 spin_lock(&nfs_client_lock
);
1244 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1245 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1246 spin_unlock(&nfs_client_lock
);
1248 server
->mount_time
= jiffies
;
1249 dprintk("<-- nfs4_create_server() = %p\n", server
);
1253 nfs_free_server(server
);
1254 dprintk("<-- nfs4_create_server() = error %d\n", error
);
1255 return ERR_PTR(error
);
1259 * Create an NFS4 referral server record
1261 struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*data
,
1262 struct nfs_fh
*mntfh
)
1264 struct nfs_client
*parent_client
;
1265 struct nfs_server
*server
, *parent_server
;
1266 struct nfs_fattr fattr
;
1269 dprintk("--> nfs4_create_referral_server()\n");
1271 server
= nfs_alloc_server();
1273 return ERR_PTR(-ENOMEM
);
1275 parent_server
= NFS_SB(data
->sb
);
1276 parent_client
= parent_server
->nfs_client
;
1278 /* Initialise the client representation from the parent server */
1279 nfs_server_copy_userdata(server
, parent_server
);
1280 server
->caps
|= NFS_CAP_ATOMIC_OPEN
;
1282 /* Get a client representation.
1283 * Note: NFSv4 always uses TCP, */
1284 error
= nfs4_set_client(server
, data
->hostname
,
1287 parent_client
->cl_ipaddr
,
1289 parent_server
->client
->cl_xprt
->prot
,
1290 parent_server
->client
->cl_timeout
);
1294 error
= nfs_init_server_rpcclient(server
, parent_server
->client
->cl_timeout
, data
->authflavor
);
1298 BUG_ON(!server
->nfs_client
);
1299 BUG_ON(!server
->nfs_client
->rpc_ops
);
1300 BUG_ON(!server
->nfs_client
->rpc_ops
->file_inode_ops
);
1302 /* Probe the root fh to retrieve its FSID and filehandle */
1303 error
= nfs4_path_walk(server
, mntfh
, data
->mnt_path
);
1307 /* probe the filesystem info for this server filesystem */
1308 error
= nfs_probe_fsinfo(server
, mntfh
, &fattr
);
1312 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1313 server
->namelen
= NFS4_MAXNAMLEN
;
1315 dprintk("Referral FSID: %llx:%llx\n",
1316 (unsigned long long) server
->fsid
.major
,
1317 (unsigned long long) server
->fsid
.minor
);
1319 spin_lock(&nfs_client_lock
);
1320 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1321 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1322 spin_unlock(&nfs_client_lock
);
1324 server
->mount_time
= jiffies
;
1326 dprintk("<-- nfs_create_referral_server() = %p\n", server
);
1330 nfs_free_server(server
);
1331 dprintk("<-- nfs4_create_referral_server() = error %d\n", error
);
1332 return ERR_PTR(error
);
1335 #endif /* CONFIG_NFS_V4 */
1338 * Clone an NFS2, NFS3 or NFS4 server record
1340 struct nfs_server
*nfs_clone_server(struct nfs_server
*source
,
1342 struct nfs_fattr
*fattr
)
1344 struct nfs_server
*server
;
1345 struct nfs_fattr fattr_fsinfo
;
1348 dprintk("--> nfs_clone_server(,%llx:%llx,)\n",
1349 (unsigned long long) fattr
->fsid
.major
,
1350 (unsigned long long) fattr
->fsid
.minor
);
1352 server
= nfs_alloc_server();
1354 return ERR_PTR(-ENOMEM
);
1356 /* Copy data from the source */
1357 server
->nfs_client
= source
->nfs_client
;
1358 atomic_inc(&server
->nfs_client
->cl_count
);
1359 nfs_server_copy_userdata(server
, source
);
1361 server
->fsid
= fattr
->fsid
;
1363 error
= nfs_init_server_rpcclient(server
,
1364 source
->client
->cl_timeout
,
1365 source
->client
->cl_auth
->au_flavor
);
1367 goto out_free_server
;
1368 if (!IS_ERR(source
->client_acl
))
1369 nfs_init_server_aclclient(server
);
1371 /* probe the filesystem info for this server filesystem */
1372 error
= nfs_probe_fsinfo(server
, fh
, &fattr_fsinfo
);
1374 goto out_free_server
;
1376 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
1377 server
->namelen
= NFS4_MAXNAMLEN
;
1379 dprintk("Cloned FSID: %llx:%llx\n",
1380 (unsigned long long) server
->fsid
.major
,
1381 (unsigned long long) server
->fsid
.minor
);
1383 error
= nfs_start_lockd(server
);
1385 goto out_free_server
;
1387 spin_lock(&nfs_client_lock
);
1388 list_add_tail(&server
->client_link
, &server
->nfs_client
->cl_superblocks
);
1389 list_add_tail(&server
->master_link
, &nfs_volume_list
);
1390 spin_unlock(&nfs_client_lock
);
1392 server
->mount_time
= jiffies
;
1394 dprintk("<-- nfs_clone_server() = %p\n", server
);
1398 nfs_free_server(server
);
1399 dprintk("<-- nfs_clone_server() = error %d\n", error
);
1400 return ERR_PTR(error
);
1403 #ifdef CONFIG_PROC_FS
1404 static struct proc_dir_entry
*proc_fs_nfs
;
1406 static int nfs_server_list_open(struct inode
*inode
, struct file
*file
);
1407 static void *nfs_server_list_start(struct seq_file
*p
, loff_t
*pos
);
1408 static void *nfs_server_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
);
1409 static void nfs_server_list_stop(struct seq_file
*p
, void *v
);
1410 static int nfs_server_list_show(struct seq_file
*m
, void *v
);
1412 static struct seq_operations nfs_server_list_ops
= {
1413 .start
= nfs_server_list_start
,
1414 .next
= nfs_server_list_next
,
1415 .stop
= nfs_server_list_stop
,
1416 .show
= nfs_server_list_show
,
1419 static const struct file_operations nfs_server_list_fops
= {
1420 .open
= nfs_server_list_open
,
1422 .llseek
= seq_lseek
,
1423 .release
= seq_release
,
1424 .owner
= THIS_MODULE
,
1427 static int nfs_volume_list_open(struct inode
*inode
, struct file
*file
);
1428 static void *nfs_volume_list_start(struct seq_file
*p
, loff_t
*pos
);
1429 static void *nfs_volume_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
);
1430 static void nfs_volume_list_stop(struct seq_file
*p
, void *v
);
1431 static int nfs_volume_list_show(struct seq_file
*m
, void *v
);
1433 static struct seq_operations nfs_volume_list_ops
= {
1434 .start
= nfs_volume_list_start
,
1435 .next
= nfs_volume_list_next
,
1436 .stop
= nfs_volume_list_stop
,
1437 .show
= nfs_volume_list_show
,
1440 static const struct file_operations nfs_volume_list_fops
= {
1441 .open
= nfs_volume_list_open
,
1443 .llseek
= seq_lseek
,
1444 .release
= seq_release
,
1445 .owner
= THIS_MODULE
,
1449 * open "/proc/fs/nfsfs/servers" which provides a summary of servers with which
1452 static int nfs_server_list_open(struct inode
*inode
, struct file
*file
)
1457 ret
= seq_open(file
, &nfs_server_list_ops
);
1461 m
= file
->private_data
;
1462 m
->private = PDE(inode
)->data
;
1468 * set up the iterator to start reading from the server list and return the first item
1470 static void *nfs_server_list_start(struct seq_file
*m
, loff_t
*_pos
)
1472 /* lock the list against modification */
1473 spin_lock(&nfs_client_lock
);
1474 return seq_list_start_head(&nfs_client_list
, *_pos
);
1478 * move to next server
1480 static void *nfs_server_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
)
1482 return seq_list_next(v
, &nfs_client_list
, pos
);
1486 * clean up after reading from the transports list
1488 static void nfs_server_list_stop(struct seq_file
*p
, void *v
)
1490 spin_unlock(&nfs_client_lock
);
1494 * display a header line followed by a load of call lines
1496 static int nfs_server_list_show(struct seq_file
*m
, void *v
)
1498 struct nfs_client
*clp
;
1500 /* display header on line 1 */
1501 if (v
== &nfs_client_list
) {
1502 seq_puts(m
, "NV SERVER PORT USE HOSTNAME\n");
1506 /* display one transport per line on subsequent lines */
1507 clp
= list_entry(v
, struct nfs_client
, cl_share_link
);
1509 seq_printf(m
, "v%u %s %s %3d %s\n",
1510 clp
->rpc_ops
->version
,
1511 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_ADDR
),
1512 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_PORT
),
1513 atomic_read(&clp
->cl_count
),
1520 * open "/proc/fs/nfsfs/volumes" which provides a summary of extant volumes
1522 static int nfs_volume_list_open(struct inode
*inode
, struct file
*file
)
1527 ret
= seq_open(file
, &nfs_volume_list_ops
);
1531 m
= file
->private_data
;
1532 m
->private = PDE(inode
)->data
;
1538 * set up the iterator to start reading from the volume list and return the first item
1540 static void *nfs_volume_list_start(struct seq_file
*m
, loff_t
*_pos
)
1542 /* lock the list against modification */
1543 spin_lock(&nfs_client_lock
);
1544 return seq_list_start_head(&nfs_volume_list
, *_pos
);
1548 * move to next volume
1550 static void *nfs_volume_list_next(struct seq_file
*p
, void *v
, loff_t
*pos
)
1552 return seq_list_next(v
, &nfs_volume_list
, pos
);
1556 * clean up after reading from the transports list
1558 static void nfs_volume_list_stop(struct seq_file
*p
, void *v
)
1560 spin_unlock(&nfs_client_lock
);
1564 * display a header line followed by a load of call lines
1566 static int nfs_volume_list_show(struct seq_file
*m
, void *v
)
1568 struct nfs_server
*server
;
1569 struct nfs_client
*clp
;
1570 char dev
[8], fsid
[17];
1572 /* display header on line 1 */
1573 if (v
== &nfs_volume_list
) {
1574 seq_puts(m
, "NV SERVER PORT DEV FSID\n");
1577 /* display one transport per line on subsequent lines */
1578 server
= list_entry(v
, struct nfs_server
, master_link
);
1579 clp
= server
->nfs_client
;
1581 snprintf(dev
, 8, "%u:%u",
1582 MAJOR(server
->s_dev
), MINOR(server
->s_dev
));
1584 snprintf(fsid
, 17, "%llx:%llx",
1585 (unsigned long long) server
->fsid
.major
,
1586 (unsigned long long) server
->fsid
.minor
);
1588 seq_printf(m
, "v%u %s %s %-7s %-17s\n",
1589 clp
->rpc_ops
->version
,
1590 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_ADDR
),
1591 rpc_peeraddr2str(clp
->cl_rpcclient
, RPC_DISPLAY_HEX_PORT
),
1599 * initialise the /proc/fs/nfsfs/ directory
1601 int __init
nfs_fs_proc_init(void)
1603 struct proc_dir_entry
*p
;
1605 proc_fs_nfs
= proc_mkdir("fs/nfsfs", NULL
);
1609 proc_fs_nfs
->owner
= THIS_MODULE
;
1611 /* a file of servers with which we're dealing */
1612 p
= proc_create("servers", S_IFREG
|S_IRUGO
,
1613 proc_fs_nfs
, &nfs_server_list_fops
);
1617 /* a file of volumes that we have mounted */
1618 p
= proc_create("volumes", S_IFREG
|S_IRUGO
,
1619 proc_fs_nfs
, &nfs_volume_list_fops
);
1625 remove_proc_entry("servers", proc_fs_nfs
);
1627 remove_proc_entry("fs/nfsfs", NULL
);
1633 * clean up the /proc/fs/nfsfs/ directory
1635 void nfs_fs_proc_exit(void)
1637 remove_proc_entry("volumes", proc_fs_nfs
);
1638 remove_proc_entry("servers", proc_fs_nfs
);
1639 remove_proc_entry("fs/nfsfs", NULL
);
1642 #endif /* CONFIG_PROC_FS */