2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
3 * Written by David Howells (dhowells@redhat.com)
5 #include <linux/module.h>
6 #include <linux/nfs_fs.h>
7 #include <linux/nfs_mount.h>
8 #include <linux/sunrpc/addr.h>
9 #include <linux/sunrpc/auth.h>
10 #include <linux/sunrpc/xprt.h>
11 #include <linux/sunrpc/bc_xprt.h>
12 #include <linux/sunrpc/rpc_pipe_fs.h>
15 #include "delegation.h"
16 #include "nfs4session.h"
17 #include "nfs4idmap.h"
21 #define NFSDBG_FACILITY NFSDBG_CLIENT
24 * Get a unique NFSv4.0 callback identifier which will be used
25 * by the V4.0 callback service to lookup the nfs_client struct
27 static int nfs_get_cb_ident_idr(struct nfs_client
*clp
, int minorversion
)
30 struct nfs_net
*nn
= net_generic(clp
->cl_net
, nfs_net_id
);
32 if (clp
->rpc_ops
->version
!= 4 || minorversion
!= 0)
34 idr_preload(GFP_KERNEL
);
35 spin_lock(&nn
->nfs_client_lock
);
36 ret
= idr_alloc(&nn
->cb_ident_idr
, clp
, 1, 0, GFP_NOWAIT
);
38 clp
->cl_cb_ident
= ret
;
39 spin_unlock(&nn
->nfs_client_lock
);
41 return ret
< 0 ? ret
: 0;
44 #ifdef CONFIG_NFS_V4_1
46 * Per auth flavor data server rpc clients
48 struct nfs4_ds_server
{
49 struct list_head list
; /* ds_clp->cl_ds_clients */
50 struct rpc_clnt
*rpc_clnt
;
54 * Common lookup case for DS I/O
56 static struct nfs4_ds_server
*
57 nfs4_find_ds_client(struct nfs_client
*ds_clp
, rpc_authflavor_t flavor
)
59 struct nfs4_ds_server
*dss
;
62 list_for_each_entry_rcu(dss
, &ds_clp
->cl_ds_clients
, list
) {
63 if (dss
->rpc_clnt
->cl_auth
->au_flavor
!= flavor
)
73 static struct nfs4_ds_server
*
74 nfs4_add_ds_client(struct nfs_client
*ds_clp
, rpc_authflavor_t flavor
,
75 struct nfs4_ds_server
*new)
77 struct nfs4_ds_server
*dss
;
79 spin_lock(&ds_clp
->cl_lock
);
80 list_for_each_entry(dss
, &ds_clp
->cl_ds_clients
, list
) {
81 if (dss
->rpc_clnt
->cl_auth
->au_flavor
!= flavor
)
86 list_add_rcu(&new->list
, &ds_clp
->cl_ds_clients
);
89 spin_unlock(&ds_clp
->cl_lock
); /* need some lock to protect list */
93 static struct nfs4_ds_server
*
94 nfs4_alloc_ds_server(struct nfs_client
*ds_clp
, rpc_authflavor_t flavor
)
96 struct nfs4_ds_server
*dss
;
98 dss
= kmalloc(sizeof(*dss
), GFP_NOFS
);
100 return ERR_PTR(-ENOMEM
);
102 dss
->rpc_clnt
= rpc_clone_client_set_auth(ds_clp
->cl_rpcclient
, flavor
);
103 if (IS_ERR(dss
->rpc_clnt
)) {
104 int err
= PTR_ERR(dss
->rpc_clnt
);
108 INIT_LIST_HEAD(&dss
->list
);
114 nfs4_free_ds_server(struct nfs4_ds_server
*dss
)
116 rpc_release_client(dss
->rpc_clnt
);
121 * Find or create a DS rpc client with th MDS server rpc client auth flavor
122 * in the nfs_client cl_ds_clients list.
125 nfs4_find_or_create_ds_client(struct nfs_client
*ds_clp
, struct inode
*inode
)
127 struct nfs4_ds_server
*dss
, *new;
128 rpc_authflavor_t flavor
= NFS_SERVER(inode
)->client
->cl_auth
->au_flavor
;
130 dss
= nfs4_find_ds_client(ds_clp
, flavor
);
133 new = nfs4_alloc_ds_server(ds_clp
, flavor
);
135 return ERR_CAST(new);
136 dss
= nfs4_add_ds_client(ds_clp
, flavor
, new);
138 nfs4_free_ds_server(new);
140 return dss
->rpc_clnt
;
142 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client
);
145 nfs4_shutdown_ds_clients(struct nfs_client
*clp
)
147 struct nfs4_ds_server
*dss
;
148 LIST_HEAD(shutdown_list
);
150 while (!list_empty(&clp
->cl_ds_clients
)) {
151 dss
= list_entry(clp
->cl_ds_clients
.next
,
152 struct nfs4_ds_server
, list
);
153 list_del(&dss
->list
);
154 rpc_shutdown_client(dss
->rpc_clnt
);
159 void nfs41_shutdown_client(struct nfs_client
*clp
)
161 if (nfs4_has_session(clp
)) {
162 nfs4_shutdown_ds_clients(clp
);
163 nfs4_destroy_session(clp
->cl_session
);
164 nfs4_destroy_clientid(clp
);
168 #endif /* CONFIG_NFS_V4_1 */
170 void nfs40_shutdown_client(struct nfs_client
*clp
)
172 if (clp
->cl_slot_tbl
) {
173 nfs4_shutdown_slot_table(clp
->cl_slot_tbl
);
174 kfree(clp
->cl_slot_tbl
);
178 struct nfs_client
*nfs4_alloc_client(const struct nfs_client_initdata
*cl_init
)
181 struct nfs_client
*clp
= nfs_alloc_client(cl_init
);
185 err
= nfs_get_cb_ident_idr(clp
, cl_init
->minorversion
);
189 if (cl_init
->minorversion
> NFS4_MAX_MINOR_VERSION
) {
194 spin_lock_init(&clp
->cl_lock
);
195 INIT_DELAYED_WORK(&clp
->cl_renewd
, nfs4_renew_state
);
196 INIT_LIST_HEAD(&clp
->cl_ds_clients
);
197 rpc_init_wait_queue(&clp
->cl_rpcwaitq
, "NFS client");
198 clp
->cl_state
= 1 << NFS4CLNT_LEASE_EXPIRED
;
199 clp
->cl_minorversion
= cl_init
->minorversion
;
200 clp
->cl_mvops
= nfs_v4_minor_ops
[cl_init
->minorversion
];
202 #if IS_ENABLED(CONFIG_NFS_V4_1)
203 init_waitqueue_head(&clp
->cl_lock_waitq
);
208 nfs_free_client(clp
);
213 * Destroy the NFS4 callback service
215 static void nfs4_destroy_callback(struct nfs_client
*clp
)
217 if (__test_and_clear_bit(NFS_CS_CALLBACK
, &clp
->cl_res_state
))
218 nfs_callback_down(clp
->cl_mvops
->minor_version
, clp
->cl_net
);
221 static void nfs4_shutdown_client(struct nfs_client
*clp
)
223 if (__test_and_clear_bit(NFS_CS_RENEWD
, &clp
->cl_res_state
))
224 nfs4_kill_renewd(clp
);
225 clp
->cl_mvops
->shutdown_client(clp
);
226 nfs4_destroy_callback(clp
);
227 if (__test_and_clear_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
))
228 nfs_idmap_delete(clp
);
230 rpc_destroy_wait_queue(&clp
->cl_rpcwaitq
);
231 kfree(clp
->cl_serverowner
);
232 kfree(clp
->cl_serverscope
);
233 kfree(clp
->cl_implid
);
234 kfree(clp
->cl_owner_id
);
237 void nfs4_free_client(struct nfs_client
*clp
)
239 nfs4_shutdown_client(clp
);
240 nfs_free_client(clp
);
244 * Initialize the NFS4 callback service
246 static int nfs4_init_callback(struct nfs_client
*clp
)
248 struct rpc_xprt
*xprt
;
251 xprt
= rcu_dereference_raw(clp
->cl_rpcclient
->cl_xprt
);
253 if (nfs4_has_session(clp
)) {
254 error
= xprt_setup_backchannel(xprt
, NFS41_BC_MIN_CALLBACKS
);
259 error
= nfs_callback_up(clp
->cl_mvops
->minor_version
, xprt
);
261 dprintk("%s: failed to start callback. Error = %d\n",
265 __set_bit(NFS_CS_CALLBACK
, &clp
->cl_res_state
);
271 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
272 * @clp - nfs_client to initialize
274 * Returns zero on success, or a negative errno if some error occurred.
276 int nfs40_init_client(struct nfs_client
*clp
)
278 struct nfs4_slot_table
*tbl
;
281 tbl
= kzalloc(sizeof(*tbl
), GFP_NOFS
);
285 ret
= nfs4_setup_slot_table(tbl
, NFS4_MAX_SLOT_TABLE
,
286 "NFSv4.0 transport Slot table");
292 clp
->cl_slot_tbl
= tbl
;
296 #if defined(CONFIG_NFS_V4_1)
299 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
300 * @clp - nfs_client to initialize
302 * Returns zero on success, or a negative errno if some error occurred.
304 int nfs41_init_client(struct nfs_client
*clp
)
306 struct nfs4_session
*session
= NULL
;
309 * Create the session and mark it expired.
310 * When a SEQUENCE operation encounters the expired session
311 * it will do session recovery to initialize it.
313 session
= nfs4_alloc_session(clp
);
317 clp
->cl_session
= session
;
320 * The create session reply races with the server back
321 * channel probe. Mark the client NFS_CS_SESSION_INITING
322 * so that the client back channel can find the
325 nfs_mark_client_ready(clp
, NFS_CS_SESSION_INITING
);
329 #endif /* CONFIG_NFS_V4_1 */
332 * Initialize the minor version specific parts of an NFS4 client record
334 static int nfs4_init_client_minor_version(struct nfs_client
*clp
)
338 ret
= clp
->cl_mvops
->init_client(clp
);
341 return nfs4_init_callback(clp
);
345 * nfs4_init_client - Initialise an NFS4 client record
347 * @clp: nfs_client to initialise
348 * @timeparms: timeout parameters for underlying RPC transport
349 * @ip_addr: callback IP address in presentation format
350 * @authflavor: authentication flavor for underlying RPC transport
352 * Returns pointer to an NFS client, or an ERR_PTR value.
354 struct nfs_client
*nfs4_init_client(struct nfs_client
*clp
,
355 const struct nfs_client_initdata
*cl_init
)
357 char buf
[INET6_ADDRSTRLEN
+ 1];
358 const char *ip_addr
= cl_init
->ip_addr
;
359 struct nfs_client
*old
;
362 if (clp
->cl_cons_state
== NFS_CS_READY
)
363 /* the client is initialised already */
366 /* Check NFS protocol revision and initialize RPC op vector */
367 clp
->rpc_ops
= &nfs_v4_clientops
;
369 if (clp
->cl_minorversion
!= 0)
370 __set_bit(NFS_CS_INFINITE_SLOTS
, &clp
->cl_flags
);
371 __set_bit(NFS_CS_DISCRTRY
, &clp
->cl_flags
);
372 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT
, &clp
->cl_flags
);
374 error
= nfs_create_rpc_client(clp
, cl_init
, RPC_AUTH_GSS_KRB5I
);
375 if (error
== -EINVAL
)
376 error
= nfs_create_rpc_client(clp
, cl_init
, RPC_AUTH_UNIX
);
380 /* If no clientaddr= option was specified, find a usable cb address */
381 if (ip_addr
== NULL
) {
382 struct sockaddr_storage cb_addr
;
383 struct sockaddr
*sap
= (struct sockaddr
*)&cb_addr
;
385 error
= rpc_localaddr(clp
->cl_rpcclient
, sap
, sizeof(cb_addr
));
388 error
= rpc_ntop(sap
, buf
, sizeof(buf
));
391 ip_addr
= (const char *)buf
;
393 strlcpy(clp
->cl_ipaddr
, ip_addr
, sizeof(clp
->cl_ipaddr
));
395 error
= nfs_idmap_new(clp
);
397 dprintk("%s: failed to create idmapper. Error = %d\n",
401 __set_bit(NFS_CS_IDMAP
, &clp
->cl_res_state
);
403 error
= nfs4_init_client_minor_version(clp
);
407 if (!nfs4_has_session(clp
))
408 nfs_mark_client_ready(clp
, NFS_CS_READY
);
410 error
= nfs4_discover_server_trunking(clp
, &old
);
415 clp
->cl_preserve_clid
= true;
420 nfs_mark_client_ready(clp
, error
);
422 return ERR_PTR(error
);
426 * SETCLIENTID just did a callback update with the callback ident in
427 * "drop," but server trunking discovery claims "drop" and "keep" are
428 * actually the same server. Swap the callback IDs so that "keep"
429 * will continue to use the callback ident the server now knows about,
430 * and so that "keep"'s original callback ident is destroyed when
433 static void nfs4_swap_callback_idents(struct nfs_client
*keep
,
434 struct nfs_client
*drop
)
436 struct nfs_net
*nn
= net_generic(keep
->cl_net
, nfs_net_id
);
437 unsigned int save
= keep
->cl_cb_ident
;
439 if (keep
->cl_cb_ident
== drop
->cl_cb_ident
)
442 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
443 __func__
, keep
->cl_cb_ident
, drop
->cl_cb_ident
);
445 spin_lock(&nn
->nfs_client_lock
);
447 idr_replace(&nn
->cb_ident_idr
, keep
, drop
->cl_cb_ident
);
448 keep
->cl_cb_ident
= drop
->cl_cb_ident
;
450 idr_replace(&nn
->cb_ident_idr
, drop
, save
);
451 drop
->cl_cb_ident
= save
;
453 spin_unlock(&nn
->nfs_client_lock
);
456 static bool nfs4_match_client_owner_id(const struct nfs_client
*clp1
,
457 const struct nfs_client
*clp2
)
459 if (clp1
->cl_owner_id
== NULL
|| clp2
->cl_owner_id
== NULL
)
461 return strcmp(clp1
->cl_owner_id
, clp2
->cl_owner_id
) == 0;
464 static bool nfs4_same_verifier(nfs4_verifier
*v1
, nfs4_verifier
*v2
)
466 return memcmp(v1
->data
, v2
->data
, sizeof(v1
->data
)) == 0;
469 static int nfs4_match_client(struct nfs_client
*pos
, struct nfs_client
*new,
470 struct nfs_client
**prev
, struct nfs_net
*nn
)
474 if (pos
->rpc_ops
!= new->rpc_ops
)
477 if (pos
->cl_minorversion
!= new->cl_minorversion
)
480 /* If "pos" isn't marked ready, we can't trust the
481 * remaining fields in "pos", especially the client
482 * ID and serverowner fields. Wait for CREATE_SESSION
484 if (pos
->cl_cons_state
> NFS_CS_READY
) {
485 atomic_inc(&pos
->cl_count
);
486 spin_unlock(&nn
->nfs_client_lock
);
488 nfs_put_client(*prev
);
491 status
= nfs_wait_client_init_complete(pos
);
492 spin_lock(&nn
->nfs_client_lock
);
498 if (pos
->cl_cons_state
!= NFS_CS_READY
)
501 if (pos
->cl_clientid
!= new->cl_clientid
)
504 /* NFSv4.1 always uses the uniform string, however someone
505 * might switch the uniquifier string on us.
507 if (!nfs4_match_client_owner_id(pos
, new))
514 * nfs40_walk_client_list - Find server that recognizes a client ID
516 * @new: nfs_client with client ID to test
517 * @result: OUT: found nfs_client, or new
518 * @cred: credential to use for trunking test
520 * Returns zero, a negative errno, or a negative NFS4ERR status.
521 * If zero is returned, an nfs_client pointer is planted in "result."
523 * NB: nfs40_walk_client_list() relies on the new nfs_client being
524 * the last nfs_client on the list.
526 int nfs40_walk_client_list(struct nfs_client
*new,
527 struct nfs_client
**result
,
528 struct rpc_cred
*cred
)
530 struct nfs_net
*nn
= net_generic(new->cl_net
, nfs_net_id
);
531 struct nfs_client
*pos
, *prev
= NULL
;
532 struct nfs4_setclientid_res clid
= {
533 .clientid
= new->cl_clientid
,
534 .confirm
= new->cl_confirm
,
536 int status
= -NFS4ERR_STALE_CLIENTID
;
538 spin_lock(&nn
->nfs_client_lock
);
539 list_for_each_entry(pos
, &nn
->nfs_client_list
, cl_share_link
) {
541 status
= nfs4_match_client(pos
, new, &prev
, nn
);
547 * We just sent a new SETCLIENTID, which should have
548 * caused the server to return a new cl_confirm. So if
549 * cl_confirm is the same, then this is a different
550 * server that just returned the same cl_confirm by
553 if ((new != pos
) && nfs4_same_verifier(&pos
->cl_confirm
,
557 * But if the cl_confirm's are different, then the only
558 * way that a SETCLIENTID_CONFIRM to pos can succeed is
559 * if new and pos point to the same server:
561 atomic_inc(&pos
->cl_count
);
562 spin_unlock(&nn
->nfs_client_lock
);
564 nfs_put_client(prev
);
567 status
= nfs4_proc_setclientid_confirm(pos
, &clid
, cred
);
569 case -NFS4ERR_STALE_CLIENTID
:
572 nfs4_swap_callback_idents(pos
, new);
573 pos
->cl_confirm
= new->cl_confirm
;
580 /* The callback path may have been inadvertently
581 * changed. Schedule recovery!
583 nfs4_schedule_path_down_recovery(pos
);
585 spin_lock(&nn
->nfs_client_lock
);
589 spin_lock(&nn
->nfs_client_lock
);
592 spin_unlock(&nn
->nfs_client_lock
);
594 /* No match found. The server lost our clientid */
596 nfs_put_client(prev
);
600 #ifdef CONFIG_NFS_V4_1
602 * Returns true if the server major ids match
605 nfs4_check_serverowner_major_id(struct nfs41_server_owner
*o1
,
606 struct nfs41_server_owner
*o2
)
608 if (o1
->major_id_sz
!= o2
->major_id_sz
)
610 return memcmp(o1
->major_id
, o2
->major_id
, o1
->major_id_sz
) == 0;
614 * Returns true if the server scopes match
617 nfs4_check_server_scope(struct nfs41_server_scope
*s1
,
618 struct nfs41_server_scope
*s2
)
620 if (s1
->server_scope_sz
!= s2
->server_scope_sz
)
622 return memcmp(s1
->server_scope
, s2
->server_scope
,
623 s1
->server_scope_sz
) == 0;
627 * nfs4_detect_session_trunking - Checks for session trunking.
629 * Called after a successful EXCHANGE_ID on a multi-addr connection.
630 * Upon success, add the transport.
632 * @clp: original mount nfs_client
633 * @res: result structure from an exchange_id using the original mount
634 * nfs_client with a new multi_addr transport
636 * Returns zero on success, otherwise -EINVAL
638 * Note: since the exchange_id for the new multi_addr transport uses the
639 * same nfs_client from the original mount, the cl_owner_id is reused,
640 * so eir_clientowner is the same.
642 int nfs4_detect_session_trunking(struct nfs_client
*clp
,
643 struct nfs41_exchange_id_res
*res
,
644 struct rpc_xprt
*xprt
)
646 /* Check eir_clientid */
647 if (clp
->cl_clientid
!= res
->clientid
)
650 /* Check eir_server_owner so_major_id */
651 if (!nfs4_check_serverowner_major_id(clp
->cl_serverowner
,
655 /* Check eir_server_owner so_minor_id */
656 if (clp
->cl_serverowner
->minor_id
!= res
->server_owner
->minor_id
)
659 /* Check eir_server_scope */
660 if (!nfs4_check_server_scope(clp
->cl_serverscope
, res
->server_scope
))
663 /* Session trunking passed, add the xprt */
664 rpc_clnt_xprt_switch_add_xprt(clp
->cl_rpcclient
, xprt
);
666 pr_info("NFS: %s: Session trunking succeeded for %s\n",
668 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
672 pr_info("NFS: %s: Session trunking failed for %s\n", clp
->cl_hostname
,
673 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
679 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
681 * @new: nfs_client with client ID to test
682 * @result: OUT: found nfs_client, or new
683 * @cred: credential to use for trunking test
685 * Returns zero, a negative errno, or a negative NFS4ERR status.
686 * If zero is returned, an nfs_client pointer is planted in "result."
688 * NB: nfs41_walk_client_list() relies on the new nfs_client being
689 * the last nfs_client on the list.
691 int nfs41_walk_client_list(struct nfs_client
*new,
692 struct nfs_client
**result
,
693 struct rpc_cred
*cred
)
695 struct nfs_net
*nn
= net_generic(new->cl_net
, nfs_net_id
);
696 struct nfs_client
*pos
, *prev
= NULL
;
697 int status
= -NFS4ERR_STALE_CLIENTID
;
699 spin_lock(&nn
->nfs_client_lock
);
700 list_for_each_entry(pos
, &nn
->nfs_client_list
, cl_share_link
) {
705 status
= nfs4_match_client(pos
, new, &prev
, nn
);
712 * Note that session trunking is just a special subcase of
713 * client id trunking. In either case, we want to fall back
714 * to using the existing nfs_client.
716 if (!nfs4_check_serverowner_major_id(pos
->cl_serverowner
,
717 new->cl_serverowner
))
721 atomic_inc(&pos
->cl_count
);
728 spin_unlock(&nn
->nfs_client_lock
);
729 nfs_put_client(prev
);
732 #endif /* CONFIG_NFS_V4_1 */
734 static void nfs4_destroy_server(struct nfs_server
*server
)
736 nfs_server_return_all_delegations(server
);
737 unset_pnfs_layoutdriver(server
);
738 nfs4_purge_state_owners(server
);
742 * NFSv4.0 callback thread helper
744 * Find a client by callback identifier
747 nfs4_find_client_ident(struct net
*net
, int cb_ident
)
749 struct nfs_client
*clp
;
750 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
752 spin_lock(&nn
->nfs_client_lock
);
753 clp
= idr_find(&nn
->cb_ident_idr
, cb_ident
);
755 atomic_inc(&clp
->cl_count
);
756 spin_unlock(&nn
->nfs_client_lock
);
760 #if defined(CONFIG_NFS_V4_1)
761 /* Common match routine for v4.0 and v4.1 callback services */
762 static bool nfs4_cb_match_client(const struct sockaddr
*addr
,
763 struct nfs_client
*clp
, u32 minorversion
)
765 struct sockaddr
*clap
= (struct sockaddr
*)&clp
->cl_addr
;
767 /* Don't match clients that failed to initialise */
768 if (!(clp
->cl_cons_state
== NFS_CS_READY
||
769 clp
->cl_cons_state
== NFS_CS_SESSION_INITING
))
774 /* Match the version and minorversion */
775 if (clp
->rpc_ops
->version
!= 4 ||
776 clp
->cl_minorversion
!= minorversion
)
779 /* Match only the IP address, not the port number */
780 return rpc_cmp_addr(addr
, clap
);
784 * NFSv4.1 callback thread helper
785 * For CB_COMPOUND calls, find a client by IP address, protocol version,
786 * minorversion, and sessionID
788 * Returns NULL if no such client
791 nfs4_find_client_sessionid(struct net
*net
, const struct sockaddr
*addr
,
792 struct nfs4_sessionid
*sid
, u32 minorversion
)
794 struct nfs_client
*clp
;
795 struct nfs_net
*nn
= net_generic(net
, nfs_net_id
);
797 spin_lock(&nn
->nfs_client_lock
);
798 list_for_each_entry(clp
, &nn
->nfs_client_list
, cl_share_link
) {
799 if (nfs4_cb_match_client(addr
, clp
, minorversion
) == false)
802 if (!nfs4_has_session(clp
))
806 if (memcmp(clp
->cl_session
->sess_id
.data
,
807 sid
->data
, NFS4_MAX_SESSIONID_LEN
) != 0)
810 atomic_inc(&clp
->cl_count
);
811 spin_unlock(&nn
->nfs_client_lock
);
814 spin_unlock(&nn
->nfs_client_lock
);
818 #else /* CONFIG_NFS_V4_1 */
821 nfs4_find_client_sessionid(struct net
*net
, const struct sockaddr
*addr
,
822 struct nfs4_sessionid
*sid
, u32 minorversion
)
826 #endif /* CONFIG_NFS_V4_1 */
829 * Set up an NFS4 client
831 static int nfs4_set_client(struct nfs_server
*server
,
832 const char *hostname
,
833 const struct sockaddr
*addr
,
834 const size_t addrlen
,
836 int proto
, const struct rpc_timeout
*timeparms
,
837 u32 minorversion
, struct net
*net
)
839 struct nfs_client_initdata cl_init
= {
840 .hostname
= hostname
,
846 .minorversion
= minorversion
,
848 .timeparms
= timeparms
,
850 struct nfs_client
*clp
;
852 if (server
->flags
& NFS_MOUNT_NORESVPORT
)
853 set_bit(NFS_CS_NORESVPORT
, &cl_init
.init_flags
);
854 if (server
->options
& NFS_OPTION_MIGRATION
)
855 set_bit(NFS_CS_MIGRATION
, &cl_init
.init_flags
);
857 /* Allocate or find a client reference we can use */
858 clp
= nfs_get_client(&cl_init
);
862 if (server
->nfs_client
== clp
)
866 * Query for the lease time on clientid setup or renewal
868 * Note that this will be set on nfs_clients that were created
869 * only for the DS role and did not set this bit, but now will
872 set_bit(NFS_CS_CHECK_LEASE_TIME
, &clp
->cl_res_state
);
874 server
->nfs_client
= clp
;
879 * Set up a pNFS Data Server client.
881 * Return any existing nfs_client that matches server address,port,version
884 * For a new nfs_client, use a soft mount (default), a low retrans and a
885 * low timeout interval so that if a connection is lost, we retry through
888 struct nfs_client
*nfs4_set_ds_client(struct nfs_server
*mds_srv
,
889 const struct sockaddr
*ds_addr
, int ds_addrlen
,
890 int ds_proto
, unsigned int ds_timeo
, unsigned int ds_retrans
,
893 struct rpc_timeout ds_timeout
;
894 struct nfs_client
*mds_clp
= mds_srv
->nfs_client
;
895 struct nfs_client_initdata cl_init
= {
897 .addrlen
= ds_addrlen
,
898 .nodename
= mds_clp
->cl_rpcclient
->cl_nodename
,
899 .ip_addr
= mds_clp
->cl_ipaddr
,
902 .minorversion
= minor_version
,
903 .net
= mds_clp
->cl_net
,
904 .timeparms
= &ds_timeout
,
906 char buf
[INET6_ADDRSTRLEN
+ 1];
908 if (rpc_ntop(ds_addr
, buf
, sizeof(buf
)) <= 0)
909 return ERR_PTR(-EINVAL
);
910 cl_init
.hostname
= buf
;
912 if (mds_srv
->flags
& NFS_MOUNT_NORESVPORT
)
913 __set_bit(NFS_CS_NORESVPORT
, &cl_init
.init_flags
);
916 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
917 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
918 * (section 13.1 RFC 5661).
920 nfs_init_timeout_values(&ds_timeout
, ds_proto
, ds_timeo
, ds_retrans
);
921 return nfs_get_client(&cl_init
);
923 EXPORT_SYMBOL_GPL(nfs4_set_ds_client
);
926 * Session has been established, and the client marked ready.
927 * Set the mount rsize and wsize with negotiated fore channel
928 * attributes which will be bound checked in nfs_server_set_fsinfo.
930 static void nfs4_session_set_rwsize(struct nfs_server
*server
)
932 #ifdef CONFIG_NFS_V4_1
933 struct nfs4_session
*sess
;
937 if (!nfs4_has_session(server
->nfs_client
))
939 sess
= server
->nfs_client
->cl_session
;
940 server_resp_sz
= sess
->fc_attrs
.max_resp_sz
- nfs41_maxread_overhead
;
941 server_rqst_sz
= sess
->fc_attrs
.max_rqst_sz
- nfs41_maxwrite_overhead
;
943 if (!server
->rsize
|| server
->rsize
> server_resp_sz
)
944 server
->rsize
= server_resp_sz
;
945 if (!server
->wsize
|| server
->wsize
> server_rqst_sz
)
946 server
->wsize
= server_rqst_sz
;
947 #endif /* CONFIG_NFS_V4_1 */
950 static int nfs4_server_common_setup(struct nfs_server
*server
,
951 struct nfs_fh
*mntfh
, bool auth_probe
)
953 struct nfs_fattr
*fattr
;
956 /* data servers support only a subset of NFSv4.1 */
957 if (is_ds_only_client(server
->nfs_client
))
958 return -EPROTONOSUPPORT
;
960 fattr
= nfs_alloc_fattr();
964 /* We must ensure the session is initialised first */
965 error
= nfs4_init_session(server
->nfs_client
);
969 /* Set the basic capabilities */
970 server
->caps
|= server
->nfs_client
->cl_mvops
->init_caps
;
971 if (server
->flags
& NFS_MOUNT_NORDIRPLUS
)
972 server
->caps
&= ~NFS_CAP_READDIRPLUS
;
974 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
977 if (nfs4_disable_idmapping
&&
978 server
->client
->cl_auth
->au_flavor
== RPC_AUTH_UNIX
)
979 server
->caps
|= NFS_CAP_UIDGID_NOMAP
;
982 /* Probe the root fh to retrieve its FSID and filehandle */
983 error
= nfs4_get_rootfh(server
, mntfh
, auth_probe
);
987 dprintk("Server FSID: %llx:%llx\n",
988 (unsigned long long) server
->fsid
.major
,
989 (unsigned long long) server
->fsid
.minor
);
990 nfs_display_fhandle(mntfh
, "Pseudo-fs root FH");
992 nfs4_session_set_rwsize(server
);
994 error
= nfs_probe_fsinfo(server
, mntfh
, fattr
);
998 if (server
->namelen
== 0 || server
->namelen
> NFS4_MAXNAMLEN
)
999 server
->namelen
= NFS4_MAXNAMLEN
;
1001 nfs_server_insert_lists(server
);
1002 server
->mount_time
= jiffies
;
1003 server
->destroy
= nfs4_destroy_server
;
1005 nfs_free_fattr(fattr
);
1010 * Create a version 4 volume record
1012 static int nfs4_init_server(struct nfs_server
*server
,
1013 struct nfs_parsed_mount_data
*data
)
1015 struct rpc_timeout timeparms
;
1018 nfs_init_timeout_values(&timeparms
, data
->nfs_server
.protocol
,
1019 data
->timeo
, data
->retrans
);
1021 /* Initialise the client representation from the mount data */
1022 server
->flags
= data
->flags
;
1023 server
->options
= data
->options
;
1024 server
->auth_info
= data
->auth_info
;
1026 /* Use the first specified auth flavor. If this flavor isn't
1027 * allowed by the server, use the SECINFO path to try the
1028 * other specified flavors */
1029 if (data
->auth_info
.flavor_len
>= 1)
1030 data
->selected_flavor
= data
->auth_info
.flavors
[0];
1032 data
->selected_flavor
= RPC_AUTH_UNIX
;
1034 /* Get a client record */
1035 error
= nfs4_set_client(server
,
1036 data
->nfs_server
.hostname
,
1037 (const struct sockaddr
*)&data
->nfs_server
.address
,
1038 data
->nfs_server
.addrlen
,
1039 data
->client_address
,
1040 data
->nfs_server
.protocol
,
1048 server
->rsize
= nfs_block_size(data
->rsize
, NULL
);
1050 server
->wsize
= nfs_block_size(data
->wsize
, NULL
);
1052 server
->acregmin
= data
->acregmin
* HZ
;
1053 server
->acregmax
= data
->acregmax
* HZ
;
1054 server
->acdirmin
= data
->acdirmin
* HZ
;
1055 server
->acdirmax
= data
->acdirmax
* HZ
;
1056 server
->port
= data
->nfs_server
.port
;
1058 return nfs_init_server_rpcclient(server
, &timeparms
,
1059 data
->selected_flavor
);
1063 * Create a version 4 volume record
1064 * - keyed on server and FSID
1066 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1067 struct nfs_fh *mntfh)*/
1068 struct nfs_server
*nfs4_create_server(struct nfs_mount_info
*mount_info
,
1069 struct nfs_subversion
*nfs_mod
)
1071 struct nfs_server
*server
;
1075 server
= nfs_alloc_server();
1077 return ERR_PTR(-ENOMEM
);
1079 auth_probe
= mount_info
->parsed
->auth_info
.flavor_len
< 1;
1081 /* set up the general RPC client */
1082 error
= nfs4_init_server(server
, mount_info
->parsed
);
1086 error
= nfs4_server_common_setup(server
, mount_info
->mntfh
, auth_probe
);
1093 nfs_free_server(server
);
1094 return ERR_PTR(error
);
1098 * Create an NFS4 referral server record
1100 struct nfs_server
*nfs4_create_referral_server(struct nfs_clone_mount
*data
,
1101 struct nfs_fh
*mntfh
)
1103 struct nfs_client
*parent_client
;
1104 struct nfs_server
*server
, *parent_server
;
1108 server
= nfs_alloc_server();
1110 return ERR_PTR(-ENOMEM
);
1112 parent_server
= NFS_SB(data
->sb
);
1113 parent_client
= parent_server
->nfs_client
;
1115 /* Initialise the client representation from the parent server */
1116 nfs_server_copy_userdata(server
, parent_server
);
1118 /* Get a client representation.
1119 * Note: NFSv4 always uses TCP, */
1120 error
= nfs4_set_client(server
, data
->hostname
,
1123 parent_client
->cl_ipaddr
,
1124 rpc_protocol(parent_server
->client
),
1125 parent_server
->client
->cl_timeout
,
1126 parent_client
->cl_mvops
->minor_version
,
1127 parent_client
->cl_net
);
1131 error
= nfs_init_server_rpcclient(server
, parent_server
->client
->cl_timeout
, data
->authflavor
);
1135 auth_probe
= parent_server
->auth_info
.flavor_len
< 1;
1137 error
= nfs4_server_common_setup(server
, mntfh
, auth_probe
);
1144 nfs_free_server(server
);
1145 return ERR_PTR(error
);
1149 * Grab the destination's particulars, including lease expiry time.
1151 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1154 static int nfs_probe_destination(struct nfs_server
*server
)
1156 struct inode
*inode
= d_inode(server
->super
->s_root
);
1157 struct nfs_fattr
*fattr
;
1160 fattr
= nfs_alloc_fattr();
1164 /* Sanity: the probe won't work if the destination server
1165 * does not recognize the migrated FH. */
1166 error
= nfs_probe_fsinfo(server
, NFS_FH(inode
), fattr
);
1168 nfs_free_fattr(fattr
);
1173 * nfs4_update_server - Move an nfs_server to a different nfs_client
1175 * @server: represents FSID to be moved
1176 * @hostname: new end-point's hostname
1177 * @sap: new end-point's socket address
1178 * @salen: size of "sap"
1179 * @net: net namespace
1181 * The nfs_server must be quiescent before this function is invoked.
1182 * Either its session is drained (NFSv4.1+), or its transport is
1183 * plugged and drained (NFSv4.0).
1185 * Returns zero on success, or a negative errno value.
1187 int nfs4_update_server(struct nfs_server
*server
, const char *hostname
,
1188 struct sockaddr
*sap
, size_t salen
, struct net
*net
)
1190 struct nfs_client
*clp
= server
->nfs_client
;
1191 struct rpc_clnt
*clnt
= server
->client
;
1192 struct xprt_create xargs
= {
1193 .ident
= clp
->cl_proto
,
1197 .servername
= hostname
,
1199 char buf
[INET6_ADDRSTRLEN
+ 1];
1200 struct sockaddr_storage address
;
1201 struct sockaddr
*localaddr
= (struct sockaddr
*)&address
;
1204 error
= rpc_switch_client_transport(clnt
, &xargs
, clnt
->cl_timeout
);
1208 error
= rpc_localaddr(clnt
, localaddr
, sizeof(address
));
1212 if (rpc_ntop(localaddr
, buf
, sizeof(buf
)) == 0)
1213 return -EAFNOSUPPORT
;
1215 nfs_server_remove_lists(server
);
1216 error
= nfs4_set_client(server
, hostname
, sap
, salen
, buf
,
1217 clp
->cl_proto
, clnt
->cl_timeout
,
1218 clp
->cl_minorversion
, net
);
1219 nfs_put_client(clp
);
1221 nfs_server_insert_lists(server
);
1225 if (server
->nfs_client
->cl_hostname
== NULL
)
1226 server
->nfs_client
->cl_hostname
= kstrdup(hostname
, GFP_KERNEL
);
1227 nfs_server_insert_lists(server
);
1229 return nfs_probe_destination(server
);