blob: 3df0eb52da1c97d3802c34702068a36f31f02d69 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/nfs/nfs4state.c
3 *
4 * Client-side XDR for NFSv4.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Kendrick Smith <kmsmith@umich.edu>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 *
36 * Implementation of the NFSv4 state model. For the time being,
37 * this is minimal, but will be made much more complex in a
38 * subsequent patch.
39 */
40
Trond Myklebust6f43ddc2007-07-08 16:49:11 -040041#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/slab.h>
Arnd Bergmannb89f4322010-09-18 15:09:31 +020043#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/nfs_fs.h>
Trond Myklebust5043e902006-01-03 09:55:23 +010045#include <linux/kthread.h>
46#include <linux/module.h>
Trond Myklebust9f958ab2007-07-02 13:58:33 -040047#include <linux/random.h>
Randy Dunlap8c7597f2010-10-22 16:18:52 -070048#include <linux/ratelimit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/workqueue.h>
50#include <linux/bitops.h>
Chuck Lever0aaaf5c2011-12-06 16:13:48 -050051#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Chuck Lever05f4c352012-09-14 17:24:32 -040053#include <linux/sunrpc/clnt.h>
54
Trond Myklebust4ce79712005-06-22 17:16:21 +000055#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include "callback.h"
57#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040058#include "internal.h"
Anna Schumaker40c64c22015-04-15 13:00:05 -040059#include "nfs4idmap.h"
Trond Myklebust76e697b2012-11-26 14:20:49 -050060#include "nfs4session.h"
Andy Adamson974cec82010-10-20 00:18:02 -040061#include "pnfs.h"
Stanislav Kinsburskybbe0a3a2012-08-20 18:00:36 +040062#include "netns.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Chuck Levere3c0fb72012-05-21 22:45:24 -040064#define NFSDBG_FACILITY NFSDBG_STATE
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#define OPENOWNER_POOL_SIZE 8
67
Trond Myklebust93b717f2016-05-16 17:42:43 -040068const nfs4_stateid zero_stateid = {
Linus Torvaldse0714ec2016-05-27 17:20:27 -070069 { .data = { 0 } },
Trond Myklebust93b717f2016-05-16 17:42:43 -040070 .type = NFS4_SPECIAL_STATEID_TYPE,
71};
Trond Myklebustfcd88432017-11-07 12:39:44 -050072const nfs4_stateid invalid_stateid = {
73 {
Trond Myklebust445f2882017-11-18 13:50:11 -050074 /* Funky initialiser keeps older gcc versions happy */
75 .data = { 0xff, 0xff, 0xff, 0xff, 0 },
Trond Myklebustfcd88432017-11-07 12:39:44 -050076 },
77 .type = NFS4_INVALID_STATEID_TYPE,
78};
79
Fred Isaman2409a972016-10-06 12:11:21 -040080const nfs4_stateid current_stateid = {
81 {
82 /* Funky initialiser keeps older gcc versions happy */
83 .data = { 0x0, 0x0, 0x0, 0x1, 0 },
84 },
85 .type = NFS4_SPECIAL_STATEID_TYPE,
86};
87
Chuck Lever05f4c352012-09-14 17:24:32 -040088static DEFINE_MUTEX(nfs_clid_init_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Andy Adamson591d71c2009-04-01 09:22:47 -040090int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
Trond Myklebustfd954ae2011-04-24 14:28:18 -040092 struct nfs4_setclientid_res clid = {
93 .clientid = clp->cl_clientid,
94 .confirm = clp->cl_confirm,
95 };
Chuck Leverf738f512009-03-18 20:48:06 -040096 unsigned short port;
97 int status;
Stanislav Kinsburskybbe0a3a2012-08-20 18:00:36 +040098 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
Chuck Leverf738f512009-03-18 20:48:06 -040099
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400100 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
101 goto do_confirm;
Stanislav Kinsburskybbe0a3a2012-08-20 18:00:36 +0400102 port = nn->nfs_callback_tcpport;
Chuck Leverf738f512009-03-18 20:48:06 -0400103 if (clp->cl_addr.ss_family == AF_INET6)
Stanislav Kinsbursky29dcc162012-08-20 18:00:41 +0400104 port = nn->nfs_callback_tcpport6;
Chuck Leverf738f512009-03-18 20:48:06 -0400105
Trond Myklebustbb8b27e2010-04-16 16:43:06 -0400106 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
107 if (status != 0)
108 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400109 clp->cl_clientid = clid.clientid;
110 clp->cl_confirm = clid.confirm;
111 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
112do_confirm:
Trond Myklebustbb8b27e2010-04-16 16:43:06 -0400113 status = nfs4_proc_setclientid_confirm(clp, &clid, cred);
114 if (status != 0)
115 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400116 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebustbb8b27e2010-04-16 16:43:06 -0400117 nfs4_schedule_state_renewal(clp);
118out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 return status;
120}
121
Chuck Lever05f4c352012-09-14 17:24:32 -0400122/**
123 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
124 *
125 * @clp: nfs_client under test
126 * @result: OUT: found nfs_client, or clp
127 * @cred: credential to use for trunking test
128 *
129 * Returns zero, a negative errno, or a negative NFS4ERR status.
130 * If zero is returned, an nfs_client pointer is planted in
131 * "result".
132 *
133 * Note: The returned client may not yet be marked ready.
134 */
135int nfs40_discover_server_trunking(struct nfs_client *clp,
136 struct nfs_client **result,
137 struct rpc_cred *cred)
138{
139 struct nfs4_setclientid_res clid = {
140 .clientid = clp->cl_clientid,
141 .confirm = clp->cl_confirm,
142 };
Trond Myklebust9f623872012-10-01 16:17:31 -0700143 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
Chuck Lever05f4c352012-09-14 17:24:32 -0400144 unsigned short port;
145 int status;
146
Trond Myklebust9f623872012-10-01 16:17:31 -0700147 port = nn->nfs_callback_tcpport;
Chuck Lever05f4c352012-09-14 17:24:32 -0400148 if (clp->cl_addr.ss_family == AF_INET6)
Trond Myklebust9f623872012-10-01 16:17:31 -0700149 port = nn->nfs_callback_tcpport6;
Chuck Lever05f4c352012-09-14 17:24:32 -0400150
151 status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
152 if (status != 0)
153 goto out;
154 clp->cl_clientid = clid.clientid;
155 clp->cl_confirm = clid.confirm;
156
157 status = nfs40_walk_client_list(clp, result, cred);
Trond Myklebust202c3122013-01-18 22:56:23 -0500158 if (status == 0) {
Chuck Lever05f4c352012-09-14 17:24:32 -0400159 /* Sustain the lease, even if it's empty. If the clientid4
160 * goes stale it's of no use for trunking discovery. */
161 nfs4_schedule_state_renewal(*result);
Chuck Lever05f4c352012-09-14 17:24:32 -0400162 }
Chuck Lever05f4c352012-09-14 17:24:32 -0400163out:
164 return status;
165}
166
Andy Adamsona7b72102009-04-01 09:22:46 -0400167struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400168{
169 struct rpc_cred *cred = NULL;
170
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400171 if (clp->cl_machine_cred != NULL)
172 cred = get_rpccred(clp->cl_machine_cred);
Trond Myklebusta2b2bb82008-04-08 16:02:17 -0400173 return cred;
174}
175
Chuck Leverd688f7b2013-07-24 12:28:28 -0400176static void nfs4_root_machine_cred(struct nfs_client *clp)
177{
178 struct rpc_cred *cred, *new;
179
180 new = rpc_lookup_machine_cred(NULL);
181 spin_lock(&clp->cl_lock);
182 cred = clp->cl_machine_cred;
183 clp->cl_machine_cred = new;
184 spin_unlock(&clp->cl_lock);
185 if (cred != NULL)
186 put_rpccred(cred);
187}
188
Chuck Lever24d292b2010-12-24 01:32:43 +0000189static struct rpc_cred *
190nfs4_get_renew_cred_server_locked(struct nfs_server *server)
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100191{
Chuck Lever24d292b2010-12-24 01:32:43 +0000192 struct rpc_cred *cred = NULL;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100193 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400194 struct rb_node *pos;
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100195
Chuck Lever24d292b2010-12-24 01:32:43 +0000196 for (pos = rb_first(&server->state_owners);
197 pos != NULL;
198 pos = rb_next(pos)) {
199 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb4454fe2006-01-03 09:55:25 +0100200 if (list_empty(&sp->so_states))
201 continue;
202 cred = get_rpccred(sp->so_cred);
203 break;
204 }
205 return cred;
206}
207
Chuck Lever24d292b2010-12-24 01:32:43 +0000208/**
209 * nfs4_get_renew_cred_locked - Acquire credential for a renew operation
210 * @clp: client state handle
211 *
212 * Returns an rpc_cred with reference count bumped, or NULL.
213 * Caller must hold clp->cl_lock.
214 */
215struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
216{
217 struct rpc_cred *cred = NULL;
218 struct nfs_server *server;
219
Sachin Prabhue49a29b2012-03-16 19:25:52 +0000220 /* Use machine credentials if available */
221 cred = nfs4_get_machine_cred_locked(clp);
222 if (cred != NULL)
223 goto out;
224
Chuck Lever24d292b2010-12-24 01:32:43 +0000225 rcu_read_lock();
226 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
227 cred = nfs4_get_renew_cred_server_locked(server);
228 if (cred != NULL)
229 break;
230 }
231 rcu_read_unlock();
Sachin Prabhue49a29b2012-03-16 19:25:52 +0000232
233out:
Chuck Lever24d292b2010-12-24 01:32:43 +0000234 return cred;
235}
236
Andy Adamson62f288a2013-06-19 16:39:44 -0400237static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500238{
Andy Adamson774d5f12013-05-20 14:13:50 -0400239 if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
Trond Myklebust961a8282012-01-17 22:57:37 -0500240 spin_lock(&tbl->slot_tbl_lock);
Trond Myklebustb75ad4c2012-11-29 17:27:47 -0500241 nfs41_wake_slot_table(tbl);
Trond Myklebust961a8282012-01-17 22:57:37 -0500242 spin_unlock(&tbl->slot_tbl_lock);
Alexandros Batsakis689cf5c2009-12-14 21:27:56 -0800243 }
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500244}
245
Andy Adamson62f288a2013-06-19 16:39:44 -0400246static void nfs4_end_drain_session(struct nfs_client *clp)
247{
248 struct nfs4_session *ses = clp->cl_session;
249
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400250 if (clp->cl_slot_tbl) {
251 nfs4_end_drain_slot_table(clp->cl_slot_tbl);
252 return;
253 }
254
Andy Adamson62f288a2013-06-19 16:39:44 -0400255 if (ses != NULL) {
256 nfs4_end_drain_slot_table(&ses->bc_slot_table);
257 nfs4_end_drain_slot_table(&ses->fc_slot_table);
258 }
259}
260
Andy Adamson774d5f12013-05-20 14:13:50 -0400261static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl)
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500262{
Andy Adamson774d5f12013-05-20 14:13:50 -0400263 set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500264 spin_lock(&tbl->slot_tbl_lock);
Andy Adamsonb6bf6e72012-02-17 13:05:23 -0500265 if (tbl->highest_used_slotid != NFS4_NO_SLOT) {
Wolfram Sang16735d02013-11-14 14:32:02 -0800266 reinit_completion(&tbl->complete);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500267 spin_unlock(&tbl->slot_tbl_lock);
Andy Adamson42acd022011-01-06 02:04:34 +0000268 return wait_for_completion_interruptible(&tbl->complete);
Ricardo Labiaga9dfdf402009-12-06 12:57:34 -0500269 }
270 spin_unlock(&tbl->slot_tbl_lock);
271 return 0;
272}
273
Andy Adamson42acd022011-01-06 02:04:34 +0000274static int nfs4_begin_drain_session(struct nfs_client *clp)
275{
276 struct nfs4_session *ses = clp->cl_session;
Trond Myklebust8aafd2f2018-08-11 11:52:38 -0400277 int ret;
Andy Adamson42acd022011-01-06 02:04:34 +0000278
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400279 if (clp->cl_slot_tbl)
280 return nfs4_drain_slot_tbl(clp->cl_slot_tbl);
281
Andy Adamson42acd022011-01-06 02:04:34 +0000282 /* back channel */
Andy Adamson774d5f12013-05-20 14:13:50 -0400283 ret = nfs4_drain_slot_tbl(&ses->bc_slot_table);
Andy Adamson42acd022011-01-06 02:04:34 +0000284 if (ret)
285 return ret;
286 /* fore channel */
Andy Adamson774d5f12013-05-20 14:13:50 -0400287 return nfs4_drain_slot_tbl(&ses->fc_slot_table);
Andy Adamson42acd022011-01-06 02:04:34 +0000288}
289
Chuck Leverc9fdeb22013-10-17 14:13:02 -0400290#if defined(CONFIG_NFS_V4_1)
291
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400292static int nfs41_setup_state_renewal(struct nfs_client *clp)
293{
294 int status;
295 struct nfs_fsinfo fsinfo;
Trond Myklebustfb10fb62016-08-05 19:13:08 -0400296 unsigned long now;
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400297
298 if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) {
299 nfs4_schedule_state_renewal(clp);
300 return 0;
301 }
302
Trond Myklebustfb10fb62016-08-05 19:13:08 -0400303 now = jiffies;
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400304 status = nfs4_proc_get_lease_time(clp, &fsinfo);
305 if (status == 0) {
Trond Myklebustfb10fb62016-08-05 19:13:08 -0400306 nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now);
Chuck Lever2cf8bca2013-08-09 12:49:56 -0400307 nfs4_schedule_state_renewal(clp);
308 }
309
310 return status;
311}
312
Trond Myklebustbda197f2012-06-05 10:22:14 -0400313static void nfs41_finish_session_reset(struct nfs_client *clp)
314{
315 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
316 clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
317 /* create_session negotiated new slot table */
Trond Myklebustbda197f2012-06-05 10:22:14 -0400318 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
319 nfs41_setup_state_renewal(clp);
320}
321
Andy Adamson4d643d12009-12-04 15:52:24 -0500322int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
323{
324 int status;
325
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400326 if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state))
327 goto do_confirm;
Andy Adamson4d643d12009-12-04 15:52:24 -0500328 status = nfs4_proc_exchange_id(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500329 if (status != 0)
330 goto out;
Trond Myklebustfd954ae2011-04-24 14:28:18 -0400331 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
332do_confirm:
Trond Myklebust848f5bd2012-05-25 17:51:23 -0400333 status = nfs4_proc_create_session(clp, cred);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500334 if (status != 0)
335 goto out;
Trond Myklebustbda197f2012-06-05 10:22:14 -0400336 nfs41_finish_session_reset(clp);
Ricardo Labiaga9430fb62009-12-06 12:23:46 -0500337 nfs_mark_client_ready(clp, NFS_CS_READY);
338out:
Andy Adamson4d643d12009-12-04 15:52:24 -0500339 return status;
340}
341
Chuck Lever05f4c352012-09-14 17:24:32 -0400342/**
343 * nfs41_discover_server_trunking - Detect server IP address trunking (mv1)
344 *
345 * @clp: nfs_client under test
346 * @result: OUT: found nfs_client, or clp
347 * @cred: credential to use for trunking test
348 *
349 * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status.
350 * If NFS4_OK is returned, an nfs_client pointer is planted in
351 * "result".
352 *
353 * Note: The returned client may not yet be marked ready.
354 */
355int nfs41_discover_server_trunking(struct nfs_client *clp,
356 struct nfs_client **result,
357 struct rpc_cred *cred)
358{
359 int status;
360
361 status = nfs4_proc_exchange_id(clp, cred);
362 if (status != NFS4_OK)
363 return status;
364
Trond Myklebust48d66b92015-03-03 20:28:59 -0500365 status = nfs41_walk_client_list(clp, result, cred);
366 if (status < 0)
367 return status;
368 if (clp != *result)
369 return 0;
370
Chuck Lever8dcbec62017-06-08 11:52:44 -0400371 /*
372 * Purge state if the client id was established in a prior
373 * instance and the client id could not have arrived on the
374 * server via Transparent State Migration.
375 */
376 if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) {
377 if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags))
378 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
379 else
380 set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
381 }
Trond Myklebust48d66b92015-03-03 20:28:59 -0500382 nfs4_schedule_state_manager(clp);
383 status = nfs_wait_client_init_complete(clp);
384 if (status < 0)
385 nfs_put_client(clp);
386 return status;
Chuck Lever05f4c352012-09-14 17:24:32 -0400387}
388
Andy Adamsonb4b82602009-04-01 09:22:49 -0400389#endif /* CONFIG_NFS_V4_1 */
390
Chuck Lever24d292b2010-12-24 01:32:43 +0000391/**
Chuck Lever73d8bde2013-07-24 12:28:37 -0400392 * nfs4_get_clid_cred - Acquire credential for a setclientid operation
Chuck Lever24d292b2010-12-24 01:32:43 +0000393 * @clp: client state handle
394 *
395 * Returns an rpc_cred with reference count bumped, or NULL.
396 */
Chuck Lever73d8bde2013-07-24 12:28:37 -0400397struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp)
Chuck Lever24d292b2010-12-24 01:32:43 +0000398{
Chuck Lever24d292b2010-12-24 01:32:43 +0000399 struct rpc_cred *cred;
400
401 spin_lock(&clp->cl_lock);
402 cred = nfs4_get_machine_cred_locked(clp);
403 spin_unlock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000404 return cred;
405}
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407static struct nfs4_state_owner *
Chuck Lever24d292b2010-12-24 01:32:43 +0000408nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409{
Chuck Lever24d292b2010-12-24 01:32:43 +0000410 struct rb_node **p = &server->state_owners.rb_node,
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400411 *parent = NULL;
Chuck Lever414adf12011-12-06 16:13:39 -0500412 struct nfs4_state_owner *sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400414 while (*p != NULL) {
415 parent = *p;
Chuck Lever24d292b2010-12-24 01:32:43 +0000416 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400417
418 if (cred < sp->so_cred)
419 p = &parent->rb_left;
420 else if (cred > sp->so_cred)
421 p = &parent->rb_right;
422 else {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500423 if (!list_empty(&sp->so_lru))
424 list_del_init(&sp->so_lru);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400425 atomic_inc(&sp->so_count);
Chuck Lever414adf12011-12-06 16:13:39 -0500426 return sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 }
Chuck Lever414adf12011-12-06 16:13:39 -0500429 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400432static struct nfs4_state_owner *
Chuck Lever24d292b2010-12-24 01:32:43 +0000433nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400434{
Chuck Lever24d292b2010-12-24 01:32:43 +0000435 struct nfs_server *server = new->so_server;
436 struct rb_node **p = &server->state_owners.rb_node,
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400437 *parent = NULL;
438 struct nfs4_state_owner *sp;
439
440 while (*p != NULL) {
441 parent = *p;
Chuck Lever24d292b2010-12-24 01:32:43 +0000442 sp = rb_entry(parent, struct nfs4_state_owner, so_server_node);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400443
444 if (new->so_cred < sp->so_cred)
445 p = &parent->rb_left;
446 else if (new->so_cred > sp->so_cred)
447 p = &parent->rb_right;
448 else {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500449 if (!list_empty(&sp->so_lru))
450 list_del_init(&sp->so_lru);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400451 atomic_inc(&sp->so_count);
452 return sp;
453 }
454 }
Chuck Lever24d292b2010-12-24 01:32:43 +0000455 rb_link_node(&new->so_server_node, parent, p);
456 rb_insert_color(&new->so_server_node, &server->state_owners);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400457 return new;
458}
459
460static void
Chuck Lever24d292b2010-12-24 01:32:43 +0000461nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400462{
Chuck Lever24d292b2010-12-24 01:32:43 +0000463 struct nfs_server *server = sp->so_server;
464
465 if (!RB_EMPTY_NODE(&sp->so_server_node))
466 rb_erase(&sp->so_server_node, &server->state_owners);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400467}
468
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500469static void
470nfs4_init_seqid_counter(struct nfs_seqid_counter *sc)
471{
Trond Myklebust95b72eb2012-04-20 19:24:51 -0400472 sc->create_time = ktime_get();
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500473 sc->flags = 0;
474 sc->counter = 0;
475 spin_lock_init(&sc->lock);
476 INIT_LIST_HEAD(&sc->list);
477 rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue");
478}
479
480static void
481nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc)
482{
483 rpc_destroy_wait_queue(&sc->wait);
484}
485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486/*
487 * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to
488 * create a new state_owner.
489 *
490 */
491static struct nfs4_state_owner *
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500492nfs4_alloc_state_owner(struct nfs_server *server,
493 struct rpc_cred *cred,
494 gfp_t gfp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
496 struct nfs4_state_owner *sp;
497
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500498 sp = kzalloc(sizeof(*sp), gfp_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (!sp)
500 return NULL;
Matthew Wilcoxaae57302018-03-14 19:48:27 -0700501 sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
502 gfp_flags);
503 if (sp->so_seqid.owner_id < 0) {
504 kfree(sp);
505 return NULL;
506 }
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500507 sp->so_server = server;
508 sp->so_cred = get_rpccred(cred);
Trond Myklebustec073422005-10-20 14:22:47 -0700509 spin_lock_init(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 INIT_LIST_HEAD(&sp->so_states);
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500511 nfs4_init_seqid_counter(&sp->so_seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 atomic_set(&sp->so_count, 1);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500513 INIT_LIST_HEAD(&sp->so_lru);
Trond Myklebustc137afa2013-02-07 14:41:11 -0500514 seqcount_init(&sp->so_reclaim_seqcount);
Trond Myklebust65b62a22013-02-07 10:54:07 -0500515 mutex_init(&sp->so_delegreturn_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 return sp;
517}
518
Adrian Bunk1d2e88e2008-05-02 13:42:45 -0700519static void
NeilBrown86cfb042016-12-19 11:48:23 +1100520nfs4_reset_state_owner(struct nfs4_state_owner *sp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521{
NeilBrown86cfb042016-12-19 11:48:23 +1100522 /* This state_owner is no longer usable, but must
523 * remain in place so that state recovery can find it
524 * and the opens associated with it.
525 * It may also be used for new 'open' request to
526 * return a delegation to the server.
527 * So update the 'create_time' so that it looks like
528 * a new state_owner. This will cause the server to
529 * request an OPEN_CONFIRM to start a new sequence.
530 */
531 sp->so_seqid.create_time = ktime_get();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532}
533
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500534static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
535{
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500536 nfs4_destroy_seqid_counter(&sp->so_seqid);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500537 put_rpccred(sp->so_cred);
Matthew Wilcoxaae57302018-03-14 19:48:27 -0700538 ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500539 kfree(sp);
540}
541
542static void nfs4_gc_state_owners(struct nfs_server *server)
543{
544 struct nfs_client *clp = server->nfs_client;
545 struct nfs4_state_owner *sp, *tmp;
546 unsigned long time_min, time_max;
547 LIST_HEAD(doomed);
548
549 spin_lock(&clp->cl_lock);
550 time_max = jiffies;
551 time_min = (long)time_max - (long)clp->cl_lease_time;
552 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
553 /* NB: LRU is sorted so that oldest is at the head */
554 if (time_in_range(sp->so_expires, time_min, time_max))
555 break;
556 list_move(&sp->so_lru, &doomed);
557 nfs4_remove_state_owner_locked(sp);
558 }
559 spin_unlock(&clp->cl_lock);
560
561 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
562 list_del(&sp->so_lru);
563 nfs4_free_state_owner(sp);
564 }
565}
566
Chuck Lever24d292b2010-12-24 01:32:43 +0000567/**
568 * nfs4_get_state_owner - Look up a state owner given a credential
569 * @server: nfs_server to search
570 * @cred: RPC credential to match
571 *
572 * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL.
573 */
574struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500575 struct rpc_cred *cred,
576 gfp_t gfp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
David Howells7539bba2006-08-22 20:06:09 -0400578 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 struct nfs4_state_owner *sp, *new;
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 spin_lock(&clp->cl_lock);
Chuck Lever24d292b2010-12-24 01:32:43 +0000582 sp = nfs4_find_state_owner_locked(server, cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 if (sp != NULL)
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500585 goto out;
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500586 new = nfs4_alloc_state_owner(server, cred, gfp_flags);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400587 if (new == NULL)
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500588 goto out;
Matthew Wilcoxaae57302018-03-14 19:48:27 -0700589 spin_lock(&clp->cl_lock);
590 sp = nfs4_insert_state_owner_locked(new);
591 spin_unlock(&clp->cl_lock);
Trond Myklebustd1e284d2012-01-17 22:04:24 -0500592 if (sp != new)
593 nfs4_free_state_owner(new);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500594out:
595 nfs4_gc_state_owners(server);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400596 return sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
Chuck Lever24d292b2010-12-24 01:32:43 +0000599/**
600 * nfs4_put_state_owner - Release a nfs4_state_owner
601 * @sp: state owner data to release
Trond Myklebust7bf97bc2012-04-21 12:36:19 -0400602 *
603 * Note that we keep released state owners on an LRU
604 * list.
605 * This caches valid state owners so that they can be
606 * reused, to avoid the OPEN_CONFIRM on minor version 0.
607 * It also pins the uniquifier of dropped state owners for
608 * a while, to ensure that those state owner names are
609 * never reused.
Chuck Lever24d292b2010-12-24 01:32:43 +0000610 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611void nfs4_put_state_owner(struct nfs4_state_owner *sp)
612{
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500613 struct nfs_server *server = sp->so_server;
614 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
616 if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
617 return;
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500618
Trond Myklebust7bf97bc2012-04-21 12:36:19 -0400619 sp->so_expires = jiffies;
620 list_add_tail(&sp->so_lru, &server->state_owners_lru);
621 spin_unlock(&clp->cl_lock);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500622}
623
624/**
625 * nfs4_purge_state_owners - Release all cached state owners
626 * @server: nfs_server with cached state owners to release
627 *
628 * Called at umount time. Remaining state owners will be on
629 * the LRU with ref count of zero.
630 */
631void nfs4_purge_state_owners(struct nfs_server *server)
632{
633 struct nfs_client *clp = server->nfs_client;
634 struct nfs4_state_owner *sp, *tmp;
635 LIST_HEAD(doomed);
636
637 spin_lock(&clp->cl_lock);
638 list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) {
639 list_move(&sp->so_lru, &doomed);
640 nfs4_remove_state_owner_locked(sp);
641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 spin_unlock(&clp->cl_lock);
Chuck Lever0aaaf5c2011-12-06 16:13:48 -0500643
644 list_for_each_entry_safe(sp, tmp, &doomed, so_lru) {
645 list_del(&sp->so_lru);
646 nfs4_free_state_owner(sp);
647 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648}
649
650static struct nfs4_state *
651nfs4_alloc_open_state(void)
652{
653 struct nfs4_state *state;
654
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400655 state = kzalloc(sizeof(*state), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (!state)
657 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 atomic_set(&state->count, 1);
659 INIT_LIST_HEAD(&state->lock_states);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000660 spin_lock_init(&state->state_lock);
Trond Myklebust8bda4e42007-07-09 10:45:42 -0400661 seqlock_init(&state->seqlock);
Trond Myklebustc9399f22017-11-06 15:28:01 -0500662 init_waitqueue_head(&state->waitq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 return state;
664}
665
Trond Myklebust4cecb762005-11-04 15:32:58 -0500666void
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500667nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500668{
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500669 if (state->state == fmode)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500670 return;
671 /* NB! List reordering - see the reclaim code for why. */
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500672 if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) {
673 if (fmode & FMODE_WRITE)
Trond Myklebust4cecb762005-11-04 15:32:58 -0500674 list_move(&state->open_states, &state->owner->so_states);
675 else
676 list_move_tail(&state->open_states, &state->owner->so_states);
677 }
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500678 state->state = fmode;
Trond Myklebust4cecb762005-11-04 15:32:58 -0500679}
680
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681static struct nfs4_state *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner)
683{
684 struct nfs_inode *nfsi = NFS_I(inode);
685 struct nfs4_state *state;
686
687 list_for_each_entry(state, &nfsi->open_states, inode_states) {
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400688 if (state->owner != owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 continue;
Trond Myklebust5d422302013-03-14 16:57:48 -0400690 if (!nfs4_valid_open_stateid(state))
691 continue;
Trond Myklebust1c816ef2007-07-03 14:41:19 -0400692 if (atomic_inc_not_zero(&state->count))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 return state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 }
695 return NULL;
696}
697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698static void
699nfs4_free_open_state(struct nfs4_state *state)
700{
701 kfree(state);
702}
703
704struct nfs4_state *
705nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
706{
707 struct nfs4_state *state, *new;
708 struct nfs_inode *nfsi = NFS_I(inode);
709
710 spin_lock(&inode->i_lock);
711 state = __nfs4_find_state_byowner(inode, owner);
712 spin_unlock(&inode->i_lock);
713 if (state)
714 goto out;
715 new = nfs4_alloc_open_state();
Trond Myklebustec073422005-10-20 14:22:47 -0700716 spin_lock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 spin_lock(&inode->i_lock);
718 state = __nfs4_find_state_byowner(inode, owner);
719 if (state == NULL && new != NULL) {
720 state = new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 state->owner = owner;
722 atomic_inc(&owner->so_count);
723 list_add(&state->inode_states, &nfsi->open_states);
Dave Chinner0444d762011-03-29 18:08:50 +1100724 ihold(inode);
725 state->inode = inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700727 /* Note: The reclaim code dictates that we add stateless
728 * and read-only stateids to the end of the list */
729 list_add_tail(&state->open_states, &owner->so_states);
730 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 } else {
732 spin_unlock(&inode->i_lock);
Trond Myklebustec073422005-10-20 14:22:47 -0700733 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 if (new)
735 nfs4_free_open_state(new);
736 }
737out:
738 return state;
739}
740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741void nfs4_put_open_state(struct nfs4_state *state)
742{
743 struct inode *inode = state->inode;
744 struct nfs4_state_owner *owner = state->owner;
745
Trond Myklebustec073422005-10-20 14:22:47 -0700746 if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 return;
Trond Myklebustec073422005-10-20 14:22:47 -0700748 spin_lock(&inode->i_lock);
Trond Myklebustba6830312007-07-27 10:23:05 -0400749 list_del(&state->inode_states);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 list_del(&state->open_states);
Trond Myklebustec073422005-10-20 14:22:47 -0700751 spin_unlock(&inode->i_lock);
752 spin_unlock(&owner->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 nfs4_free_open_state(state);
755 nfs4_put_state_owner(owner);
756}
757
758/*
Trond Myklebust83c9d412005-10-18 14:20:13 -0700759 * Close the current file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 */
Al Viro643168c2011-06-22 18:20:23 -0400761static void __nfs4_close(struct nfs4_state *state,
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400762 fmode_t fmode, gfp_t gfp_mask, int wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 struct nfs4_state_owner *owner = state->owner;
Trond Myklebust003707c2007-07-05 18:07:55 -0400765 int call_close = 0;
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500766 fmode_t newstate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 atomic_inc(&owner->so_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 /* Protect against nfs4_find_state() */
Trond Myklebustec073422005-10-20 14:22:47 -0700770 spin_lock(&owner->so_lock);
Trond Myklebustdc0b0272008-12-23 15:21:56 -0500771 switch (fmode & (FMODE_READ | FMODE_WRITE)) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100772 case FMODE_READ:
773 state->n_rdonly--;
774 break;
775 case FMODE_WRITE:
776 state->n_wronly--;
777 break;
778 case FMODE_READ|FMODE_WRITE:
779 state->n_rdwr--;
780 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400781 newstate = FMODE_READ|FMODE_WRITE;
Trond Myklebuste7616922006-01-03 09:55:13 +0100782 if (state->n_rdwr == 0) {
Trond Myklebust003707c2007-07-05 18:07:55 -0400783 if (state->n_rdonly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100784 newstate &= ~FMODE_READ;
Trond Myklebust003707c2007-07-05 18:07:55 -0400785 call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
786 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
787 }
788 if (state->n_wronly == 0) {
Trond Myklebuste7616922006-01-03 09:55:13 +0100789 newstate &= ~FMODE_WRITE;
Trond Myklebust003707c2007-07-05 18:07:55 -0400790 call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
791 call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
792 }
793 if (newstate == 0)
794 clear_bit(NFS_DELEGATED_STATE, &state->flags);
Trond Myklebuste7616922006-01-03 09:55:13 +0100795 }
Trond Myklebust003707c2007-07-05 18:07:55 -0400796 nfs4_state_set_mode_locked(state, newstate);
Trond Myklebustec073422005-10-20 14:22:47 -0700797 spin_unlock(&owner->so_lock);
Trond Myklebust4cecb762005-11-04 15:32:58 -0500798
Trond Myklebust003707c2007-07-05 18:07:55 -0400799 if (!call_close) {
Trond Myklebustb39e6252007-06-11 23:05:07 -0400800 nfs4_put_open_state(state);
801 nfs4_put_state_owner(owner);
Trond Myklebust1f7977c2012-09-20 20:31:51 -0400802 } else
803 nfs4_do_close(state, gfp_mask, wait);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400804}
805
Al Viro643168c2011-06-22 18:20:23 -0400806void nfs4_close_state(struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400807{
Al Viro643168c2011-06-22 18:20:23 -0400808 __nfs4_close(state, fmode, GFP_NOFS, 0);
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400809}
810
Al Viro643168c2011-06-22 18:20:23 -0400811void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode)
Trond Myklebusta49c3c72007-10-18 18:03:27 -0400812{
Al Viro643168c2011-06-22 18:20:23 -0400813 __nfs4_close(state, fmode, GFP_KERNEL, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
815
816/*
817 * Search the state->lock_states for an existing lock_owner
NeilBrown3f8f2542016-12-19 11:33:13 +1100818 * that is compatible with either of the given owners.
819 * If the second is non-zero, then the first refers to a Posix-lock
820 * owner (current->files) and the second refers to a flock/OFD
821 * owner (struct file*). In that case, prefer a match for the first
822 * owner.
823 * If both sorts of locks are held on the one file we cannot know
824 * which stateid was intended to be used, so a "correct" choice cannot
825 * be made. Failing that, a "consistent" choice is preferable. The
826 * consistent choice we make is to prefer the first owner, that of a
827 * Posix lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 */
829static struct nfs4_lock_state *
NeilBrown8d424432016-10-13 15:26:47 +1100830__nfs4_find_lock_state(struct nfs4_state *state,
831 fl_owner_t fl_owner, fl_owner_t fl_owner2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832{
NeilBrown3f8f2542016-12-19 11:33:13 +1100833 struct nfs4_lock_state *pos, *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 list_for_each_entry(pos, &state->lock_states, ls_locks) {
NeilBrown3f8f2542016-12-19 11:33:13 +1100835 if (pos->ls_owner == fl_owner) {
836 ret = pos;
837 break;
838 }
839 if (pos->ls_owner == fl_owner2)
840 ret = pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 }
NeilBrown3f8f2542016-12-19 11:33:13 +1100842 if (ret)
Elena Reshetova194bc1f2017-10-20 12:53:36 +0300843 refcount_inc(&ret->ls_count);
NeilBrown3f8f2542016-12-19 11:33:13 +1100844 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845}
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847/*
848 * Return a compatible lock_state. If no initialized lock_state structure
849 * exists, return an uninitialized one.
850 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 */
Jeff Layton8003d3c2014-05-01 06:28:45 -0400852static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
854 struct nfs4_lock_state *lsp;
Chuck Lever24d292b2010-12-24 01:32:43 +0000855 struct nfs_server *server = state->owner->so_server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400857 lsp = kzalloc(sizeof(*lsp), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 if (lsp == NULL)
859 return NULL;
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500860 nfs4_init_seqid_counter(&lsp->ls_seqid);
Elena Reshetova194bc1f2017-10-20 12:53:36 +0300861 refcount_set(&lsp->ls_count, 1);
Trond Myklebustb64aec82009-07-21 16:47:46 -0400862 lsp->ls_state = state;
Jeff Layton8003d3c2014-05-01 06:28:45 -0400863 lsp->ls_owner = fl_owner;
Trond Myklebust48c22eb2012-01-17 22:04:25 -0500864 lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS);
865 if (lsp->ls_seqid.owner_id < 0)
Trond Myklebustd2d7ce22012-01-17 22:04:25 -0500866 goto out_free;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000867 INIT_LIST_HEAD(&lsp->ls_locks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 return lsp;
Trond Myklebustd2d7ce22012-01-17 22:04:25 -0500869out_free:
870 kfree(lsp);
871 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872}
873
Trond Myklebust5ae67c42012-03-19 16:17:18 -0400874void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400875{
Trond Myklebust48c22eb2012-01-17 22:04:25 -0500876 ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id);
Trond Myklebust7ba127a2012-01-17 22:04:25 -0500877 nfs4_destroy_seqid_counter(&lsp->ls_seqid);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400878 kfree(lsp);
879}
880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881/*
882 * Return a compatible lock_state. If no initialized lock_state structure
883 * exists, return an uninitialized one.
884 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 */
Jeff Layton8003d3c2014-05-01 06:28:45 -0400886static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000888 struct nfs4_lock_state *lsp, *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000890 for(;;) {
891 spin_lock(&state->state_lock);
Wei Yongjun68e33bd2017-01-12 15:39:18 +0000892 lsp = __nfs4_find_lock_state(state, owner, NULL);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000893 if (lsp != NULL)
894 break;
895 if (new != NULL) {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000896 list_add(&new->ls_locks, &state->lock_states);
897 set_bit(LK_STATE_IN_USE, &state->flags);
898 lsp = new;
899 new = NULL;
900 break;
901 }
902 spin_unlock(&state->state_lock);
Jeff Layton8003d3c2014-05-01 06:28:45 -0400903 new = nfs4_alloc_lock_state(state, owner);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000904 if (new == NULL)
905 return NULL;
906 }
907 spin_unlock(&state->state_lock);
Trond Myklebust9f958ab2007-07-02 13:58:33 -0400908 if (new != NULL)
Trond Myklebust5ae67c42012-03-19 16:17:18 -0400909 nfs4_free_lock_state(state->owner->so_server, new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 return lsp;
911}
912
913/*
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000914 * Release reference to lock_state, and free it if we see that
915 * it is no longer in use
916 */
Trond Myklebustfaf5f492005-10-18 14:20:15 -0700917void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000918{
Trond Myklebustc8b2d0b2013-05-03 16:22:55 -0400919 struct nfs_server *server;
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000920 struct nfs4_state *state;
921
922 if (lsp == NULL)
923 return;
924 state = lsp->ls_state;
Elena Reshetova194bc1f2017-10-20 12:53:36 +0300925 if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock))
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000926 return;
927 list_del(&lsp->ls_locks);
928 if (list_empty(&state->lock_states))
929 clear_bit(LK_STATE_IN_USE, &state->flags);
930 spin_unlock(&state->state_lock);
Jeff Layton0c0e0d32014-09-08 08:26:01 -0400931 server = state->owner->so_server;
932 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
933 struct nfs_client *clp = server->nfs_client;
934
935 clp->cl_mvops->free_lock_state(server, lsp);
936 } else
Trond Myklebustc8b2d0b2013-05-03 16:22:55 -0400937 nfs4_free_lock_state(server, lsp);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000938}
939
940static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)
941{
942 struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner;
943
944 dst->fl_u.nfs4_fl.owner = lsp;
Elena Reshetova194bc1f2017-10-20 12:53:36 +0300945 refcount_inc(&lsp->ls_count);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000946}
947
948static void nfs4_fl_release_lock(struct file_lock *fl)
949{
950 nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner);
951}
952
Alexey Dobriyan6aed6282009-09-21 17:01:11 -0700953static const struct file_lock_operations nfs4_fl_lock_ops = {
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000954 .fl_copy_lock = nfs4_fl_copy_lock,
955 .fl_release_private = nfs4_fl_release_lock,
956};
957
958int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
959{
960 struct nfs4_lock_state *lsp;
961
962 if (fl->fl_ops != NULL)
963 return 0;
Jeff Layton8003d3c2014-05-01 06:28:45 -0400964 lsp = nfs4_get_lock_state(state, fl->fl_owner);
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000965 if (lsp == NULL)
966 return -ENOMEM;
967 fl->fl_u.nfs4_fl.owner = lsp;
968 fl->fl_ops = &nfs4_fl_lock_ops;
969 return 0;
970}
971
Trond Myklebust5521abf2013-03-16 20:54:34 -0400972static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
973 struct nfs4_state *state,
NeilBrown17393472016-10-13 15:26:47 +1100974 const struct nfs_lock_context *l_ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975{
Trond Myklebust8d0a8a92005-06-22 17:16:32 +0000976 struct nfs4_lock_state *lsp;
NeilBrown8d424432016-10-13 15:26:47 +1100977 fl_owner_t fl_owner, fl_flock_owner;
Trond Myklebust5521abf2013-03-16 20:54:34 -0400978 int ret = -ENOENT;
Trond Myklebust4fc87962012-03-08 17:42:01 -0500979
NeilBrown17393472016-10-13 15:26:47 +1100980 if (l_ctx == NULL)
Trond Myklebust2a369152012-08-13 18:54:45 -0400981 goto out;
982
Trond Myklebust4fc87962012-03-08 17:42:01 -0500983 if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
984 goto out;
985
NeilBrownd51fdb82016-10-13 15:26:47 +1100986 fl_owner = l_ctx->lockowner;
NeilBrown8d424432016-10-13 15:26:47 +1100987 fl_flock_owner = l_ctx->open_context->flock_owner;
988
Trond Myklebust4fc87962012-03-08 17:42:01 -0500989 spin_lock(&state->state_lock);
NeilBrown8d424432016-10-13 15:26:47 +1100990 lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner);
NeilBrownef1820f2013-09-04 17:04:49 +1000991 if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
992 ret = -EIO;
993 else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
Trond Myklebust4fc87962012-03-08 17:42:01 -0500994 nfs4_stateid_copy(dst, &lsp->ls_stateid);
Trond Myklebust5521abf2013-03-16 20:54:34 -0400995 ret = 0;
Trond Myklebust4fc87962012-03-08 17:42:01 -0500996 }
997 spin_unlock(&state->state_lock);
998 nfs4_put_lock_state(lsp);
999out:
1000 return ret;
1001}
1002
Trond Myklebust12f275c2017-11-06 15:28:05 -05001003bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
1004{
1005 bool ret;
1006 int seq;
1007
1008 do {
1009 ret = false;
1010 seq = read_seqbegin(&state->seqlock);
1011 if (nfs4_state_match_open_stateid_other(state, dst)) {
1012 dst->seqid = state->open_stateid.seqid;
1013 ret = true;
1014 }
1015 } while (read_seqretry(&state->seqlock, seq));
1016 return ret;
1017}
1018
Trond Myklebustc82bac62017-11-06 15:28:06 -05001019bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
Trond Myklebust4fc87962012-03-08 17:42:01 -05001020{
Trond Myklebustc82bac62017-11-06 15:28:06 -05001021 bool ret;
Trond Myklebust92b40e92013-04-20 01:25:45 -04001022 const nfs4_stateid *src;
Trond Myklebust8bda4e42007-07-09 10:45:42 -04001023 int seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Trond Myklebust8bda4e42007-07-09 10:45:42 -04001025 do {
Trond Myklebustc82bac62017-11-06 15:28:06 -05001026 ret = false;
Trond Myklebust92b40e92013-04-20 01:25:45 -04001027 src = &zero_stateid;
Trond Myklebust8bda4e42007-07-09 10:45:42 -04001028 seq = read_seqbegin(&state->seqlock);
Trond Myklebustc82bac62017-11-06 15:28:06 -05001029 if (test_bit(NFS_OPEN_STATE, &state->flags)) {
Trond Myklebust92b40e92013-04-20 01:25:45 -04001030 src = &state->open_stateid;
Trond Myklebustc82bac62017-11-06 15:28:06 -05001031 ret = true;
1032 }
Trond Myklebust92b40e92013-04-20 01:25:45 -04001033 nfs4_stateid_copy(dst, src);
Trond Myklebust8bda4e42007-07-09 10:45:42 -04001034 } while (read_seqretry(&state->seqlock, seq));
Trond Myklebustc82bac62017-11-06 15:28:06 -05001035 return ret;
Trond Myklebust4fc87962012-03-08 17:42:01 -05001036}
Trond Myklebust8d0a8a92005-06-22 17:16:32 +00001037
Trond Myklebust4fc87962012-03-08 17:42:01 -05001038/*
1039 * Byte-range lock aware utility to initialize the stateid of read/write
1040 * requests.
1041 */
Trond Myklebustabf4e132016-05-16 17:42:44 -04001042int nfs4_select_rw_stateid(struct nfs4_state *state,
NeilBrown17393472016-10-13 15:26:47 +11001043 fmode_t fmode, const struct nfs_lock_context *l_ctx,
Trond Myklebustabf4e132016-05-16 17:42:44 -04001044 nfs4_stateid *dst, struct rpc_cred **cred)
Trond Myklebust4fc87962012-03-08 17:42:01 -05001045{
Trond Myklebustabf4e132016-05-16 17:42:44 -04001046 int ret;
1047
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001048 if (!nfs4_valid_open_stateid(state))
1049 return -EIO;
Trond Myklebustabf4e132016-05-16 17:42:44 -04001050 if (cred != NULL)
1051 *cred = NULL;
NeilBrown17393472016-10-13 15:26:47 +11001052 ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
NeilBrownef1820f2013-09-04 17:04:49 +10001053 if (ret == -EIO)
1054 /* A lost lock - don't even consider delegations */
1055 goto out;
Andy Adamson146d70c2014-02-18 10:36:05 -05001056 /* returns true if delegation stateid found and copied */
Trond Myklebustabf4e132016-05-16 17:42:44 -04001057 if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) {
Andy Adamson146d70c2014-02-18 10:36:05 -05001058 ret = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001059 goto out;
Andy Adamson146d70c2014-02-18 10:36:05 -05001060 }
Trond Myklebust5521abf2013-03-16 20:54:34 -04001061 if (ret != -ENOENT)
NeilBrownef1820f2013-09-04 17:04:49 +10001062 /* nfs4_copy_delegation_stateid() didn't over-write
1063 * dst, so it still has the lock stateid which we now
1064 * choose to use.
1065 */
Trond Myklebust5521abf2013-03-16 20:54:34 -04001066 goto out;
Trond Myklebust927864c2014-03-04 13:12:03 -05001067 nfs4_copy_open_stateid(dst, state);
1068 ret = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001069out:
Trond Myklebust3b664862013-03-17 15:31:15 -04001070 if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
1071 dst->seqid = 0;
Trond Myklebust5521abf2013-03-16 20:54:34 -04001072 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073}
1074
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001075struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076{
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001077 struct nfs_seqid *new;
1078
Trond Myklebust8535b2b2010-05-13 12:51:01 -04001079 new = kmalloc(sizeof(*new), gfp_mask);
Trond Myklebustbadc76d2015-01-23 18:48:00 -05001080 if (new == NULL)
1081 return ERR_PTR(-ENOMEM);
1082 new->sequence = counter;
1083 INIT_LIST_HEAD(&new->list);
1084 new->task = NULL;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001085 return new;
1086}
1087
Trond Myklebust72211db2009-12-15 14:47:36 -05001088void nfs_release_seqid(struct nfs_seqid *seqid)
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001089{
Trond Myklebust4601df22012-01-20 18:47:05 -05001090 struct nfs_seqid_counter *sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001091
Trond Myklebusta6796412015-01-23 19:04:44 -05001092 if (seqid == NULL || list_empty(&seqid->list))
Trond Myklebust4601df22012-01-20 18:47:05 -05001093 return;
1094 sequence = seqid->sequence;
1095 spin_lock(&sequence->lock);
1096 list_del_init(&seqid->list);
1097 if (!list_empty(&sequence->list)) {
1098 struct nfs_seqid *next;
1099
1100 next = list_first_entry(&sequence->list,
1101 struct nfs_seqid, list);
1102 rpc_wake_up_queued_task(&sequence->wait, next->task);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001103 }
Trond Myklebust4601df22012-01-20 18:47:05 -05001104 spin_unlock(&sequence->lock);
Trond Myklebust72211db2009-12-15 14:47:36 -05001105}
1106
1107void nfs_free_seqid(struct nfs_seqid *seqid)
1108{
1109 nfs_release_seqid(seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001110 kfree(seqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111}
1112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001114 * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
1115 * failed with a seqid incrementing error -
Toralf Förster16a6ddc2013-12-12 19:09:00 +01001116 * see comments nfs4.h:seqid_mutating_error()
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001117 */
Trond Myklebust88d90932007-07-02 14:03:03 -04001118static void nfs_increment_seqid(int status, struct nfs_seqid *seqid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119{
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001120 switch (status) {
1121 case 0:
1122 break;
1123 case -NFS4ERR_BAD_SEQID:
Trond Myklebust6f43ddc2007-07-08 16:49:11 -04001124 if (seqid->sequence->flags & NFS_SEQID_CONFIRMED)
1125 return;
Trond Myklebust9a3ba432012-03-12 18:01:48 -04001126 pr_warn_ratelimited("NFS: v4 server returned a bad"
Dan Muntz497799e2008-02-13 13:09:35 -08001127 " sequence-id error on an"
1128 " unconfirmed sequence %p!\n",
Trond Myklebust6f43ddc2007-07-08 16:49:11 -04001129 seqid->sequence);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001130 case -NFS4ERR_STALE_CLIENTID:
1131 case -NFS4ERR_STALE_STATEID:
1132 case -NFS4ERR_BAD_STATEID:
1133 case -NFS4ERR_BADXDR:
1134 case -NFS4ERR_RESOURCE:
1135 case -NFS4ERR_NOFILEHANDLE:
Chuck Lever406dab82017-01-26 15:14:52 -05001136 case -NFS4ERR_MOVED:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001137 /* Non-seqid mutating errors */
1138 return;
1139 };
1140 /*
1141 * Note: no locking needed as we are guaranteed to be first
1142 * on the sequence list
1143 */
1144 seqid->sequence->counter++;
1145}
1146
1147void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
1148{
Trond Myklebusta6796412015-01-23 19:04:44 -05001149 struct nfs4_state_owner *sp;
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001150
Trond Myklebusta6796412015-01-23 19:04:44 -05001151 if (seqid == NULL)
1152 return;
1153
1154 sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid);
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001155 if (status == -NFS4ERR_BAD_SEQID)
NeilBrown86cfb042016-12-19 11:48:23 +11001156 nfs4_reset_state_owner(sp);
Trond Myklebusta6796412015-01-23 19:04:44 -05001157 if (!nfs4_has_session(sp->so_server->nfs_client))
Benny Halevy34dc1ad2009-04-01 09:22:52 -04001158 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001159}
1160
1161/*
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001162 * Increment the seqid if the LOCK/LOCKU succeeded, or
1163 * failed with a seqid incrementing error -
Toralf Förster16a6ddc2013-12-12 19:09:00 +01001164 * see comments nfs4.h:seqid_mutating_error()
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001165 */
1166void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid)
1167{
Trond Myklebusta6796412015-01-23 19:04:44 -05001168 if (seqid != NULL)
1169 nfs_increment_seqid(status, seqid);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001170}
1171
1172int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
1173{
Trond Myklebusta6796412015-01-23 19:04:44 -05001174 struct nfs_seqid_counter *sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001175 int status = 0;
1176
Trond Myklebusta6796412015-01-23 19:04:44 -05001177 if (seqid == NULL)
1178 goto out;
1179 sequence = seqid->sequence;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001180 spin_lock(&sequence->lock);
Trond Myklebust4601df22012-01-20 18:47:05 -05001181 seqid->task = task;
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001182 if (list_empty(&seqid->list))
1183 list_add_tail(&seqid->list, &sequence->list);
1184 if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid)
1185 goto unlock;
Trond Myklebust5d008372008-02-22 16:34:17 -05001186 rpc_sleep_on(&sequence->wait, task, NULL);
Trond Myklebust2f74c0a2008-01-08 17:56:07 -05001187 status = -EAGAIN;
1188unlock:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001189 spin_unlock(&sequence->lock);
Trond Myklebusta6796412015-01-23 19:04:44 -05001190out:
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001191 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192}
1193
Trond Myklebuste005e802008-12-23 15:21:48 -05001194static int nfs4_run_state_manager(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
Trond Myklebuste005e802008-12-23 15:21:48 -05001196static void nfs4_clear_state_manager_bit(struct nfs_client *clp)
Trond Myklebust433fbe42006-01-03 09:55:22 +01001197{
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001198 smp_mb__before_atomic();
Trond Myklebuste005e802008-12-23 15:21:48 -05001199 clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001200 smp_mb__after_atomic();
Trond Myklebuste005e802008-12-23 15:21:48 -05001201 wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING);
Trond Myklebust433fbe42006-01-03 09:55:22 +01001202 rpc_wake_up(&clp->cl_rpcwaitq);
1203}
1204
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205/*
Trond Myklebuste005e802008-12-23 15:21:48 -05001206 * Schedule the nfs_client asynchronous state management routine
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 */
Trond Myklebustb0d3ded2008-12-23 15:21:50 -05001208void nfs4_schedule_state_manager(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209{
Trond Myklebust5043e902006-01-03 09:55:23 +01001210 struct task_struct *task;
Trond Myklebust2446ab62012-03-01 17:00:56 -05001211 char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
Trond Myklebuste005e802008-12-23 15:21:48 -05001213 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
1214 return;
Trond Myklebust5043e902006-01-03 09:55:23 +01001215 __module_get(THIS_MODULE);
Elena Reshetova212bf412017-10-20 12:53:38 +03001216 refcount_inc(&clp->cl_count);
Trond Myklebust2446ab62012-03-01 17:00:56 -05001217
1218 /* The rcu_read_lock() is not strictly necessary, as the state
1219 * manager is the only thread that ever changes the rpc_xprt
1220 * after it's initialized. At this point, we're single threaded. */
1221 rcu_read_lock();
1222 snprintf(buf, sizeof(buf), "%s-manager",
1223 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
1224 rcu_read_unlock();
Kees Cookf1701682013-07-03 15:04:58 -07001225 task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
Trond Myklebust2446ab62012-03-01 17:00:56 -05001226 if (IS_ERR(task)) {
1227 printk(KERN_ERR "%s: kthread_run: %ld\n",
1228 __func__, PTR_ERR(task));
1229 nfs4_clear_state_manager_bit(clp);
1230 nfs_put_client(clp);
1231 module_put(THIS_MODULE);
1232 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233}
1234
1235/*
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001236 * Schedule a lease recovery attempt
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 */
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001238void nfs4_schedule_lease_recovery(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239{
1240 if (!clp)
1241 return;
Trond Myklebuste598d842008-12-23 15:21:42 -05001242 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1243 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001244 dprintk("%s: scheduling lease recovery for server %s\n", __func__,
1245 clp->cl_hostname);
Trond Myklebuste005e802008-12-23 15:21:48 -05001246 nfs4_schedule_state_manager(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247}
Andy Adamson9cb81962012-03-07 10:49:41 -05001248EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
Chuck Leverc9fdeb22013-10-17 14:13:02 -04001250/**
1251 * nfs4_schedule_migration_recovery - trigger migration recovery
1252 *
1253 * @server: FSID that is migrating
1254 *
1255 * Returns zero if recovery has started, otherwise a negative NFS4ERR
1256 * value is returned.
1257 */
1258int nfs4_schedule_migration_recovery(const struct nfs_server *server)
1259{
1260 struct nfs_client *clp = server->nfs_client;
1261
1262 if (server->fh_expire_type != NFS4_FH_PERSISTENT) {
1263 pr_err("NFS: volatile file handles not supported (server %s)\n",
1264 clp->cl_hostname);
1265 return -NFS4ERR_IO;
1266 }
1267
1268 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
1269 return -NFS4ERR_IO;
1270
1271 dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n",
1272 __func__,
1273 (unsigned long long)server->fsid.major,
1274 (unsigned long long)server->fsid.minor,
1275 clp->cl_hostname);
1276
1277 set_bit(NFS_MIG_IN_TRANSITION,
1278 &((struct nfs_server *)server)->mig_status);
1279 set_bit(NFS4CLNT_MOVED, &clp->cl_state);
1280
1281 nfs4_schedule_state_manager(clp);
1282 return 0;
1283}
1284EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
1285
Chuck Leverb7f7a662013-10-17 14:13:35 -04001286/**
1287 * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
1288 *
1289 * @clp: server to check for moved leases
1290 *
1291 */
1292void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
1293{
1294 dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
1295 __func__, clp->cl_clientid, clp->cl_hostname);
1296
1297 set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
1298 nfs4_schedule_state_manager(clp);
1299}
1300EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
1301
Trond Myklebust33021272012-11-26 13:13:29 -05001302int nfs4_wait_clnt_recover(struct nfs_client *clp)
1303{
1304 int res;
1305
1306 might_sleep();
1307
Elena Reshetova212bf412017-10-20 12:53:38 +03001308 refcount_inc(&clp->cl_count);
NeilBrown74316202014-07-07 15:16:04 +10001309 res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
1310 nfs_wait_bit_killable, TASK_KILLABLE);
Trond Myklebust33021272012-11-26 13:13:29 -05001311 if (res)
Chuck Lever0625c2d2013-10-17 14:14:10 -04001312 goto out;
Trond Myklebust33021272012-11-26 13:13:29 -05001313 if (clp->cl_cons_state < 0)
Chuck Lever0625c2d2013-10-17 14:14:10 -04001314 res = clp->cl_cons_state;
1315out:
1316 nfs_put_client(clp);
1317 return res;
Trond Myklebust33021272012-11-26 13:13:29 -05001318}
1319
1320int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1321{
1322 unsigned int loop;
1323 int ret;
1324
1325 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1326 ret = nfs4_wait_clnt_recover(clp);
1327 if (ret != 0)
1328 break;
1329 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1330 !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1331 break;
1332 nfs4_schedule_state_manager(clp);
1333 ret = -EIO;
1334 }
1335 return ret;
1336}
1337
Trond Myklebustad1e3962012-03-10 11:23:15 -05001338/*
1339 * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
1340 * @clp: client to process
1341 *
1342 * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
1343 * resend of the SETCLIENTID and hence re-establish the
1344 * callback channel. Then return all existing delegations.
1345 */
1346static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
1347{
1348 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1349 nfs_expire_all_delegations(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001350 dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__,
1351 clp->cl_hostname);
Trond Myklebustad1e3962012-03-10 11:23:15 -05001352}
1353
Trond Myklebust042b60b2011-08-24 15:07:37 -04001354void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
1355{
Trond Myklebustad1e3962012-03-10 11:23:15 -05001356 nfs40_handle_cb_pathdown(clp);
Trond Myklebust042b60b2011-08-24 15:07:37 -04001357 nfs4_schedule_state_manager(clp);
1358}
1359
Trond Myklebustf9feab12011-03-09 16:12:46 -05001360static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001361{
1362
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001363 if (!nfs4_valid_open_stateid(state))
1364 return 0;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001365 set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1366 /* Don't recover state that expired before the reboot */
1367 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) {
1368 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
1369 return 0;
1370 }
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001371 set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001372 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1373 return 1;
1374}
1375
Trond Myklebust4f14c192014-02-12 19:15:06 -05001376int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001377{
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001378 if (!nfs4_valid_open_stateid(state))
1379 return 0;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001380 set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags);
1381 clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags);
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001382 set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001383 set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state);
1384 return 1;
1385}
1386
Trond Myklebust5d422302013-03-14 16:57:48 -04001387int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001388{
1389 struct nfs_client *clp = server->nfs_client;
1390
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001391 if (!nfs4_state_mark_reclaim_nograce(clp, state))
Trond Myklebust5d422302013-03-14 16:57:48 -04001392 return -EBADF;
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001393 dprintk("%s: scheduling stateid recovery for server %s\n", __func__,
1394 clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001395 nfs4_schedule_state_manager(clp);
Trond Myklebust5d422302013-03-14 16:57:48 -04001396 return 0;
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001397}
Andy Adamson9cb81962012-03-07 10:49:41 -05001398EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05001399
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001400static struct nfs4_lock_state *
1401nfs_state_find_lock_state_by_stateid(struct nfs4_state *state,
1402 const nfs4_stateid *stateid)
1403{
1404 struct nfs4_lock_state *pos;
1405
1406 list_for_each_entry(pos, &state->lock_states, ls_locks) {
1407 if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags))
1408 continue;
1409 if (nfs4_stateid_match_other(&pos->ls_stateid, stateid))
1410 return pos;
1411 }
1412 return NULL;
1413}
1414
1415static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state,
1416 const nfs4_stateid *stateid)
1417{
1418 bool found = false;
1419
1420 if (test_bit(LK_STATE_IN_USE, &state->flags)) {
1421 spin_lock(&state->state_lock);
1422 if (nfs_state_find_lock_state_by_stateid(state, stateid))
1423 found = true;
1424 spin_unlock(&state->state_lock);
1425 }
1426 return found;
1427}
1428
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001429void nfs_inode_find_state_and_recover(struct inode *inode,
1430 const nfs4_stateid *stateid)
1431{
1432 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1433 struct nfs_inode *nfsi = NFS_I(inode);
1434 struct nfs_open_context *ctx;
1435 struct nfs4_state *state;
1436 bool found = false;
1437
1438 spin_lock(&inode->i_lock);
1439 list_for_each_entry(ctx, &nfsi->open_files, list) {
1440 state = ctx->state;
1441 if (state == NULL)
1442 continue;
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001443 if (nfs4_stateid_match_other(&state->stateid, stateid) &&
1444 nfs4_state_mark_reclaim_nograce(clp, state)) {
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001445 found = true;
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001446 continue;
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001447 }
Trond Myklebust46280d92017-11-06 15:28:11 -05001448 if (nfs4_stateid_match_other(&state->open_stateid, stateid) &&
1449 nfs4_state_mark_reclaim_nograce(clp, state)) {
1450 found = true;
1451 continue;
1452 }
Trond Myklebust7ebeb7f2016-09-22 13:39:20 -04001453 if (nfs_state_lock_state_matches_stateid(state, stateid) &&
1454 nfs4_state_mark_reclaim_nograce(clp, state))
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001455 found = true;
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001456 }
1457 spin_unlock(&inode->i_lock);
Trond Myklebust6c2d8f82016-09-22 13:39:07 -04001458
1459 nfs_inode_find_delegation_state_and_recover(inode, stateid);
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001460 if (found)
1461 nfs4_schedule_state_manager(clp);
1462}
1463
Trond Myklebustc58c8442013-03-18 19:45:14 -04001464static void nfs4_state_mark_open_context_bad(struct nfs4_state *state)
1465{
1466 struct inode *inode = state->inode;
1467 struct nfs_inode *nfsi = NFS_I(inode);
1468 struct nfs_open_context *ctx;
1469
1470 spin_lock(&inode->i_lock);
1471 list_for_each_entry(ctx, &nfsi->open_files, list) {
1472 if (ctx->state != state)
1473 continue;
1474 set_bit(NFS_CONTEXT_BAD, &ctx->flags);
1475 }
1476 spin_unlock(&inode->i_lock);
1477}
1478
Trond Myklebust5d422302013-03-14 16:57:48 -04001479static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error)
1480{
1481 set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags);
Trond Myklebustc58c8442013-03-18 19:45:14 -04001482 nfs4_state_mark_open_context_bad(state);
Trond Myklebust5d422302013-03-14 16:57:48 -04001483}
1484
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -05001485
Trond Myklebust02860012008-12-23 15:21:40 -05001486static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
1488 struct inode *inode = state->inode;
Trond Myklebust19e03c52008-12-23 15:21:44 -05001489 struct nfs_inode *nfsi = NFS_I(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 struct file_lock *fl;
NeilBrowndce26302017-12-13 09:57:09 +11001491 struct nfs4_lock_state *lsp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 int status = 0;
Jeff Layton5263e312015-01-16 15:05:55 -05001493 struct file_lock_context *flctx = inode->i_flctx;
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001494 struct list_head *list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001496 if (flctx == NULL)
Trond Myklebust3f09df72009-06-17 13:23:00 -07001497 return 0;
1498
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001499 list = &flctx->flc_posix;
1500
Trond Myklebust3f09df72009-06-17 13:23:00 -07001501 /* Guard against delegation returns and new lock/unlock calls */
Trond Myklebust19e03c52008-12-23 15:21:44 -05001502 down_write(&nfsi->rwsem);
Jeff Layton6109c852015-01-16 15:05:57 -05001503 spin_lock(&flctx->flc_lock);
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001504restart:
1505 list_for_each_entry(fl, list, fl_list) {
Jeff Layton5263e312015-01-16 15:05:55 -05001506 if (nfs_file_open_context(fl->fl_file)->state != state)
1507 continue;
Jeff Layton6109c852015-01-16 15:05:57 -05001508 spin_unlock(&flctx->flc_lock);
Jeff Layton5263e312015-01-16 15:05:55 -05001509 status = ops->recover_lock(state, fl);
1510 switch (status) {
1511 case 0:
1512 break;
1513 case -ESTALE:
1514 case -NFS4ERR_ADMIN_REVOKED:
1515 case -NFS4ERR_STALE_STATEID:
1516 case -NFS4ERR_BAD_STATEID:
1517 case -NFS4ERR_EXPIRED:
1518 case -NFS4ERR_NO_GRACE:
1519 case -NFS4ERR_STALE_CLIENTID:
1520 case -NFS4ERR_BADSESSION:
1521 case -NFS4ERR_BADSLOT:
1522 case -NFS4ERR_BAD_HIGH_SLOT:
1523 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1524 goto out;
1525 default:
1526 pr_err("NFS: %s: unhandled error %d\n",
1527 __func__, status);
Gustavo A. R. Silva01e03bd2018-07-31 21:18:44 -05001528 /* Fall through */
Jeff Layton5263e312015-01-16 15:05:55 -05001529 case -ENOMEM:
1530 case -NFS4ERR_DENIED:
1531 case -NFS4ERR_RECLAIM_BAD:
1532 case -NFS4ERR_RECLAIM_CONFLICT:
NeilBrowndce26302017-12-13 09:57:09 +11001533 lsp = fl->fl_u.nfs4_fl.owner;
1534 if (lsp)
1535 set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
Jeff Layton5263e312015-01-16 15:05:55 -05001536 status = 0;
1537 }
Jeff Layton6109c852015-01-16 15:05:57 -05001538 spin_lock(&flctx->flc_lock);
Jeff Layton5263e312015-01-16 15:05:55 -05001539 }
Jeff Laytonbd61e0a2015-01-16 15:05:55 -05001540 if (list == &flctx->flc_posix) {
1541 list = &flctx->flc_flock;
1542 goto restart;
1543 }
Jeff Layton6109c852015-01-16 15:05:57 -05001544 spin_unlock(&flctx->flc_lock);
Trond Myklebust965b5d62009-06-17 13:22:59 -07001545out:
Trond Myklebust19e03c52008-12-23 15:21:44 -05001546 up_write(&nfsi->rwsem);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 return status;
1548}
1549
Trond Myklebust02860012008-12-23 15:21:40 -05001550static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551{
1552 struct nfs4_state *state;
1553 struct nfs4_lock_state *lock;
1554 int status = 0;
1555
1556 /* Note: we rely on the sp->so_states list being ordered
1557 * so that we always reclaim open(O_RDWR) and/or open(O_WRITE)
1558 * states first.
1559 * This is needed to ensure that the server won't give us any
1560 * read delegations that we have to return if, say, we are
1561 * recovering after a network partition or a reboot from a
1562 * server that doesn't support a grace period.
1563 */
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001564 spin_lock(&sp->so_lock);
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001565 raw_write_seqcount_begin(&sp->so_reclaim_seqcount);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001566restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001568 if (!test_and_clear_bit(ops->state_flag_bit, &state->flags))
1569 continue;
Trond Myklebust5d422302013-03-14 16:57:48 -04001570 if (!nfs4_valid_open_stateid(state))
1571 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 if (state->state == 0)
1573 continue;
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001574 atomic_inc(&state->count);
1575 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 status = ops->recover_open(sp, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 if (status >= 0) {
Trond Myklebust02860012008-12-23 15:21:40 -05001578 status = nfs4_reclaim_locks(state, ops);
1579 if (status >= 0) {
Jeff Layton1acd1c32013-10-31 13:03:04 -04001580 if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) {
NeilBrown66863902013-08-12 16:52:47 +10001581 spin_lock(&state->state_lock);
1582 list_for_each_entry(lock, &state->lock_states, ls_locks) {
1583 if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags))
1584 pr_warn_ratelimited("NFS: "
1585 "%s: Lock reclaim "
1586 "failed!\n", __func__);
1587 }
1588 spin_unlock(&state->state_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001589 }
Olga Kornievskaiaa41cbe82015-09-14 19:54:36 -04001590 clear_bit(NFS_STATE_RECLAIM_NOGRACE,
Olga Kornievskaiae8d975e2015-05-15 11:45:31 -04001591 &state->flags);
Olga Kornievskaiae4648aa2018-08-13 15:33:01 -04001592#ifdef CONFIG_NFS_V4_2
1593 if (test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags)) {
1594 struct nfs4_copy_state *copy;
1595
1596 spin_lock(&sp->so_server->nfs_client->cl_lock);
1597 list_for_each_entry(copy, &sp->so_server->ss_copies, copies) {
1598 if (memcmp(&state->stateid.other, &copy->parent_state->stateid.other, NFS4_STATEID_SIZE))
1599 continue;
1600 copy->flags = 1;
1601 complete(&copy->completion);
1602 printk("AGLO: server rebooted waking up the copy\n");
1603 break;
1604 }
1605 spin_unlock(&sp->so_server->nfs_client->cl_lock);
1606 }
1607#endif /* CONFIG_NFS_V4_2 */
Oleg Drokincea7f822016-06-17 16:48:23 -04001608 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001609 spin_lock(&sp->so_lock);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001610 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 }
1613 switch (status) {
1614 default:
Andy Adamson3660cd42013-10-03 12:23:24 -04001615 printk(KERN_ERR "NFS: %s: unhandled error %d\n",
1616 __func__, status);
Gustavo A. R. Silva01e03bd2018-07-31 21:18:44 -05001617 /* Fall through */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 case -ENOENT:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001619 case -ENOMEM:
Trond Myklebust304020f2016-09-22 13:39:18 -04001620 case -EACCES:
1621 case -EROFS:
1622 case -EIO:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001623 case -ESTALE:
Andy Adamson3660cd42013-10-03 12:23:24 -04001624 /* Open state on this file cannot be recovered */
Trond Myklebust5d422302013-03-14 16:57:48 -04001625 nfs4_state_mark_recovery_failed(state, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 break;
Trond Myklebust91876b12013-03-28 14:01:33 -04001627 case -EAGAIN:
1628 ssleep(1);
Gustavo A. R. Silva01e03bd2018-07-31 21:18:44 -05001629 /* Fall through */
Trond Myklebust965b5d62009-06-17 13:22:59 -07001630 case -NFS4ERR_ADMIN_REVOKED:
1631 case -NFS4ERR_STALE_STATEID:
Benjamin Coddingtond41cbfc2016-11-14 11:51:37 -05001632 case -NFS4ERR_OLD_STATEID:
Trond Myklebust965b5d62009-06-17 13:22:59 -07001633 case -NFS4ERR_BAD_STATEID:
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001634 case -NFS4ERR_RECLAIM_BAD:
1635 case -NFS4ERR_RECLAIM_CONFLICT:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001636 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001637 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 case -NFS4ERR_EXPIRED:
1639 case -NFS4ERR_NO_GRACE:
Trond Myklebust1f0e8902010-06-24 15:11:43 -04001640 nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebust9c4c7612009-12-03 15:58:56 -05001642 case -NFS4ERR_BADSESSION:
1643 case -NFS4ERR_BADSLOT:
1644 case -NFS4ERR_BAD_HIGH_SLOT:
1645 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 goto out_err;
1647 }
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001648 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001649 spin_lock(&sp->so_lock);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001650 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651 }
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001652 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001653 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 return 0;
1655out_err:
Trond Myklebustfe1d8192008-12-23 15:21:43 -05001656 nfs4_put_open_state(state);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001657 spin_lock(&sp->so_lock);
Trond Myklebustabbec2da2014-06-05 10:42:37 -04001658 raw_write_seqcount_end(&sp->so_reclaim_seqcount);
Trond Myklebustc137afa2013-02-07 14:41:11 -05001659 spin_unlock(&sp->so_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 return status;
1661}
1662
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001663static void nfs4_clear_open_state(struct nfs4_state *state)
1664{
1665 struct nfs4_lock_state *lock;
1666
1667 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1668 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1669 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1670 clear_bit(NFS_O_RDWR_STATE, &state->flags);
Trond Myklebust4b44b402011-12-09 16:31:52 -05001671 spin_lock(&state->state_lock);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001672 list_for_each_entry(lock, &state->lock_states, ls_locks) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001673 lock->ls_seqid.flags = 0;
Trond Myklebust795a88c2012-09-10 13:26:49 -04001674 clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001675 }
Trond Myklebust4b44b402011-12-09 16:31:52 -05001676 spin_unlock(&state->state_lock);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001677}
1678
Chuck Lever24d292b2010-12-24 01:32:43 +00001679static void nfs4_reset_seqids(struct nfs_server *server,
1680 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001681{
Chuck Lever24d292b2010-12-24 01:32:43 +00001682 struct nfs_client *clp = server->nfs_client;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001683 struct nfs4_state_owner *sp;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001684 struct rb_node *pos;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001685 struct nfs4_state *state;
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001686
Chuck Lever24d292b2010-12-24 01:32:43 +00001687 spin_lock(&clp->cl_lock);
1688 for (pos = rb_first(&server->state_owners);
1689 pos != NULL;
1690 pos = rb_next(pos)) {
1691 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001692 sp->so_seqid.flags = 0;
Trond Myklebustec073422005-10-20 14:22:47 -07001693 spin_lock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001694 list_for_each_entry(state, &sp->so_states, open_states) {
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001695 if (mark_reclaim(clp, state))
1696 nfs4_clear_open_state(state);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001697 }
Trond Myklebustec073422005-10-20 14:22:47 -07001698 spin_unlock(&sp->so_lock);
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001699 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001700 spin_unlock(&clp->cl_lock);
1701}
1702
1703static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp,
1704 int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state))
1705{
1706 struct nfs_server *server;
1707
1708 rcu_read_lock();
1709 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1710 nfs4_reset_seqids(server, mark_reclaim);
1711 rcu_read_unlock();
Trond Myklebustcee54fc2005-10-18 14:20:12 -07001712}
1713
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001714static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp)
1715{
1716 /* Mark all delegations for reclaim */
1717 nfs_delegation_mark_reclaim(clp);
1718 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot);
1719}
1720
Trond Myklebust0048fdd2017-05-04 13:44:04 -04001721static int nfs4_reclaim_complete(struct nfs_client *clp,
Trond Myklebust965e9c22013-05-20 11:05:17 -04001722 const struct nfs4_state_recovery_ops *ops,
1723 struct rpc_cred *cred)
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001724{
1725 /* Notify the server we're done reclaiming our state */
1726 if (ops->reclaim_complete)
Trond Myklebust0048fdd2017-05-04 13:44:04 -04001727 return ops->reclaim_complete(clp, cred);
1728 return 0;
Ricardo Labiagafce5c832009-12-05 16:08:41 -05001729}
1730
Chuck Lever24d292b2010-12-24 01:32:43 +00001731static void nfs4_clear_reclaim_server(struct nfs_server *server)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001732{
Chuck Lever24d292b2010-12-24 01:32:43 +00001733 struct nfs_client *clp = server->nfs_client;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001734 struct nfs4_state_owner *sp;
1735 struct rb_node *pos;
1736 struct nfs4_state *state;
1737
Chuck Lever24d292b2010-12-24 01:32:43 +00001738 spin_lock(&clp->cl_lock);
1739 for (pos = rb_first(&server->state_owners);
1740 pos != NULL;
1741 pos = rb_next(pos)) {
1742 sp = rb_entry(pos, struct nfs4_state_owner, so_server_node);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001743 spin_lock(&sp->so_lock);
1744 list_for_each_entry(state, &sp->so_states, open_states) {
Chuck Lever24d292b2010-12-24 01:32:43 +00001745 if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT,
1746 &state->flags))
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001747 continue;
1748 nfs4_state_mark_reclaim_nograce(clp, state);
1749 }
1750 spin_unlock(&sp->so_lock);
1751 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001752 spin_unlock(&clp->cl_lock);
1753}
1754
1755static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp)
1756{
1757 struct nfs_server *server;
1758
1759 if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state))
1760 return 0;
1761
1762 rcu_read_lock();
1763 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
1764 nfs4_clear_reclaim_server(server);
1765 rcu_read_unlock();
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001766
1767 nfs_delegation_reap_unclaimed(clp);
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001768 return 1;
1769}
1770
1771static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp)
1772{
Trond Myklebust965e9c22013-05-20 11:05:17 -04001773 const struct nfs4_state_recovery_ops *ops;
1774 struct rpc_cred *cred;
Trond Myklebust0048fdd2017-05-04 13:44:04 -04001775 int err;
Trond Myklebust965e9c22013-05-20 11:05:17 -04001776
Trond Myklebust6eaa6142010-10-04 17:59:08 -04001777 if (!nfs4_state_clear_reclaim_reboot(clp))
1778 return;
Trond Myklebust965e9c22013-05-20 11:05:17 -04001779 ops = clp->cl_mvops->reboot_recovery_ops;
Chuck Lever73d8bde2013-07-24 12:28:37 -04001780 cred = nfs4_get_clid_cred(clp);
Trond Myklebust0048fdd2017-05-04 13:44:04 -04001781 err = nfs4_reclaim_complete(clp, ops, cred);
Trond Myklebust965e9c22013-05-20 11:05:17 -04001782 put_rpccred(cred);
Trond Myklebust0048fdd2017-05-04 13:44:04 -04001783 if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
1784 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001785}
1786
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001787static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
1788{
Trond Myklebust45870d62016-09-22 13:38:59 -04001789 nfs_mark_test_expired_all_delegations(clp);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05001790 nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
1791}
1792
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001793static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
Trond Myklebuste598d842008-12-23 15:21:42 -05001794{
1795 switch (error) {
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001796 case 0:
1797 break;
Trond Myklebuste598d842008-12-23 15:21:42 -05001798 case -NFS4ERR_CB_PATH_DOWN:
Trond Myklebustad1e3962012-03-10 11:23:15 -05001799 nfs40_handle_cb_pathdown(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001800 break;
Trond Myklebustc8b7ae3d2009-12-03 15:53:21 -05001801 case -NFS4ERR_NO_GRACE:
1802 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001803 break;
Trond Myklebuste598d842008-12-23 15:21:42 -05001804 case -NFS4ERR_STALE_CLIENTID:
Trond Myklebuste598d842008-12-23 15:21:42 -05001805 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1806 nfs4_state_start_reclaim_reboot(clp);
1807 break;
1808 case -NFS4ERR_EXPIRED:
1809 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1810 nfs4_state_start_reclaim_nograce(clp);
Andy Adamson8ba9bf82009-12-04 15:55:34 -05001811 break;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001812 case -NFS4ERR_BADSESSION:
1813 case -NFS4ERR_BADSLOT:
1814 case -NFS4ERR_BAD_HIGH_SLOT:
1815 case -NFS4ERR_DEADSESSION:
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04001816 case -NFS4ERR_SEQ_FALSE_RETRY:
1817 case -NFS4ERR_SEQ_MISORDERED:
Andy Adamson6df08182009-12-04 15:55:05 -05001818 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
Andy Adamson0b9e2d42009-12-04 16:02:14 -05001819 /* Zero session reset errors */
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001820 break;
Trond Myklebust7c5d7252012-05-27 12:58:48 -04001821 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1822 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
1823 break;
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001824 default:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001825 dprintk("%s: failed to handle error %d for server %s\n",
1826 __func__, error, clp->cl_hostname);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001827 return error;
Trond Myklebuste598d842008-12-23 15:21:42 -05001828 }
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001829 dprintk("%s: handled error %d for server %s\n", __func__, error,
1830 clp->cl_hostname);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001831 return 0;
Trond Myklebuste598d842008-12-23 15:21:42 -05001832}
1833
Trond Myklebust02860012008-12-23 15:21:40 -05001834static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835{
Chuck Lever24d292b2010-12-24 01:32:43 +00001836 struct nfs4_state_owner *sp;
1837 struct nfs_server *server;
Trond Myklebust9f958ab2007-07-02 13:58:33 -04001838 struct rb_node *pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 int status = 0;
1840
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001841restart:
Chuck Lever24d292b2010-12-24 01:32:43 +00001842 rcu_read_lock();
1843 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
Chuck Lever0aaaf5c2011-12-06 16:13:48 -05001844 nfs4_purge_state_owners(server);
Chuck Lever24d292b2010-12-24 01:32:43 +00001845 spin_lock(&clp->cl_lock);
1846 for (pos = rb_first(&server->state_owners);
1847 pos != NULL;
1848 pos = rb_next(pos)) {
1849 sp = rb_entry(pos,
1850 struct nfs4_state_owner, so_server_node);
1851 if (!test_and_clear_bit(ops->owner_flag_bit,
1852 &sp->so_flags))
1853 continue;
Trond Myklebust4a0954e2015-10-02 11:11:16 -04001854 if (!atomic_inc_not_zero(&sp->so_count))
1855 continue;
Chuck Lever24d292b2010-12-24 01:32:43 +00001856 spin_unlock(&clp->cl_lock);
1857 rcu_read_unlock();
1858
1859 status = nfs4_reclaim_open_state(sp, ops);
1860 if (status < 0) {
1861 set_bit(ops->owner_flag_bit, &sp->so_flags);
1862 nfs4_put_state_owner(sp);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04001863 status = nfs4_recovery_handle_error(clp, status);
1864 return (status != 0) ? status : -EAGAIN;
Chuck Lever24d292b2010-12-24 01:32:43 +00001865 }
1866
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001867 nfs4_put_state_owner(sp);
Chuck Lever24d292b2010-12-24 01:32:43 +00001868 goto restart;
Trond Myklebust7eff03a2008-12-23 15:21:43 -05001869 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001870 spin_unlock(&clp->cl_lock);
Trond Myklebust02860012008-12-23 15:21:40 -05001871 }
Chuck Lever24d292b2010-12-24 01:32:43 +00001872 rcu_read_unlock();
Trond Myklebustdf817ba32014-09-27 17:41:51 -04001873 return 0;
Trond Myklebust02860012008-12-23 15:21:40 -05001874}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875
Trond Myklebust02860012008-12-23 15:21:40 -05001876static int nfs4_check_lease(struct nfs_client *clp)
1877{
1878 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001879 const struct nfs4_state_maintenance_ops *ops =
1880 clp->cl_mvops->state_renewal_ops;
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001881 int status;
Trond Myklebust02860012008-12-23 15:21:40 -05001882
Trond Myklebust0f605b52008-12-23 15:21:42 -05001883 /* Is the client already known to have an expired lease? */
1884 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
1885 return 0;
Andy Adamsona7b72102009-04-01 09:22:46 -04001886 spin_lock(&clp->cl_lock);
1887 cred = ops->get_state_renewal_cred_locked(clp);
1888 spin_unlock(&clp->cl_lock);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001889 if (cred == NULL) {
Chuck Lever73d8bde2013-07-24 12:28:37 -04001890 cred = nfs4_get_clid_cred(clp);
Trond Myklebust4f38e4a2011-12-01 16:31:34 -05001891 status = -ENOKEY;
Trond Myklebust0f605b52008-12-23 15:21:42 -05001892 if (cred == NULL)
1893 goto out;
Trond Myklebust02860012008-12-23 15:21:40 -05001894 }
Benny Halevy8e69514f2009-04-01 09:22:45 -04001895 status = ops->renew_lease(clp, cred);
Trond Myklebust0f605b52008-12-23 15:21:42 -05001896 put_rpccred(cred);
Trond Myklebustbc7a05c2013-04-08 17:50:28 -04001897 if (status == -ETIMEDOUT) {
1898 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1899 return 0;
1900 }
Trond Myklebust0f605b52008-12-23 15:21:42 -05001901out:
Trond Myklebust4f7cdf12009-12-03 15:53:20 -05001902 return nfs4_recovery_handle_error(clp, status);
Trond Myklebust02860012008-12-23 15:21:40 -05001903}
1904
Andy Adamson47b803c2012-10-01 20:42:32 -04001905/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors
1906 * and for recoverable errors on EXCHANGE_ID for v4.1
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001907 */
1908static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
1909{
1910 switch (status) {
Trond Myklebust89a21732012-05-25 15:00:06 -04001911 case -NFS4ERR_SEQ_MISORDERED:
1912 if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
1913 return -ESERVERFAULT;
1914 /* Lease confirmation error: retry after purging the lease */
1915 ssleep(1);
Andy Adamson47b803c2012-10-01 20:42:32 -04001916 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1917 break;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001918 case -NFS4ERR_STALE_CLIENTID:
1919 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Andy Adamson47b803c2012-10-01 20:42:32 -04001920 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001921 break;
Chuck Leverde734832012-07-11 16:30:50 -04001922 case -NFS4ERR_CLID_INUSE:
1923 pr_err("NFS: Server %s reports our clientid is in use\n",
1924 clp->cl_hostname);
1925 nfs_mark_client_ready(clp, -EPERM);
1926 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
1927 return -EPERM;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001928 case -EACCES:
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001929 case -NFS4ERR_DELAY:
1930 case -ETIMEDOUT:
1931 case -EAGAIN:
1932 ssleep(1);
1933 break;
1934
1935 case -NFS4ERR_MINOR_VERS_MISMATCH:
1936 if (clp->cl_cons_state == NFS_CS_SESSION_INITING)
1937 nfs_mark_client_ready(clp, -EPROTONOSUPPORT);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001938 dprintk("%s: exit with error %d for server %s\n",
1939 __func__, -EPROTONOSUPPORT, clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001940 return -EPROTONOSUPPORT;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001941 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
1942 * in nfs4_exchange_id */
1943 default:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001944 dprintk("%s: exit with error %d for server %s\n", __func__,
1945 status, clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001946 return status;
1947 }
1948 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04001949 dprintk("%s: handled error %d for server %s\n", __func__, status,
1950 clp->cl_hostname);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001951 return 0;
1952}
1953
Trond Myklebustb42353f2012-06-05 11:19:47 -04001954static int nfs4_establish_lease(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05001955{
1956 struct rpc_cred *cred;
Trond Myklebustc48f4f32010-06-16 09:52:27 -04001957 const struct nfs4_state_recovery_ops *ops =
1958 clp->cl_mvops->reboot_recovery_ops;
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001959 int status;
Trond Myklebust02860012008-12-23 15:21:40 -05001960
Trond Myklebust8aafd2f2018-08-11 11:52:38 -04001961 status = nfs4_begin_drain_session(clp);
1962 if (status != 0)
1963 return status;
Chuck Lever73d8bde2013-07-24 12:28:37 -04001964 cred = nfs4_get_clid_cred(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001965 if (cred == NULL)
1966 return -ENOENT;
1967 status = ops->establish_clid(clp, cred);
1968 put_rpccred(cred);
1969 if (status != 0)
Trond Myklebustb42353f2012-06-05 11:19:47 -04001970 return status;
1971 pnfs_destroy_all_layouts(clp);
1972 return 0;
1973}
1974
Chuck Lever6bbb4ae2012-07-11 16:30:59 -04001975/*
1976 * Returns zero or a negative errno. NFS4ERR values are converted
1977 * to local errno values.
1978 */
Trond Myklebustb42353f2012-06-05 11:19:47 -04001979static int nfs4_reclaim_lease(struct nfs_client *clp)
1980{
1981 int status;
1982
1983 status = nfs4_establish_lease(clp);
1984 if (status < 0)
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04001985 return nfs4_handle_reclaim_lease_error(clp, status);
Trond Myklebustb42353f2012-06-05 11:19:47 -04001986 if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state))
1987 nfs4_state_start_reclaim_nograce(clp);
1988 if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state))
1989 set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state);
1990 clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
1991 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
1992 return 0;
1993}
1994
1995static int nfs4_purge_lease(struct nfs_client *clp)
1996{
1997 int status;
1998
1999 status = nfs4_establish_lease(clp);
2000 if (status < 0)
2001 return nfs4_handle_reclaim_lease_error(clp, status);
2002 clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
2003 set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2004 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002005 return 0;
Trond Myklebust02860012008-12-23 15:21:40 -05002006}
2007
Chuck Leverc9fdeb22013-10-17 14:13:02 -04002008/*
2009 * Try remote migration of one FSID from a source server to a
2010 * destination server. The source server provides a list of
2011 * potential destinations.
2012 *
2013 * Returns zero or a negative NFS4ERR status code.
2014 */
2015static int nfs4_try_migration(struct nfs_server *server, struct rpc_cred *cred)
2016{
2017 struct nfs_client *clp = server->nfs_client;
2018 struct nfs4_fs_locations *locations = NULL;
2019 struct inode *inode;
2020 struct page *page;
2021 int status, result;
2022
2023 dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__,
2024 (unsigned long long)server->fsid.major,
2025 (unsigned long long)server->fsid.minor,
2026 clp->cl_hostname);
2027
2028 result = 0;
2029 page = alloc_page(GFP_KERNEL);
2030 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2031 if (page == NULL || locations == NULL) {
2032 dprintk("<-- %s: no memory\n", __func__);
2033 goto out;
2034 }
2035
David Howells2b0143b2015-03-17 22:25:59 +00002036 inode = d_inode(server->super->s_root);
Chuck Leverc9fdeb22013-10-17 14:13:02 -04002037 result = nfs4_proc_get_locations(inode, locations, page, cred);
2038 if (result) {
2039 dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
2040 __func__, result);
2041 goto out;
2042 }
2043
2044 result = -NFS4ERR_NXIO;
2045 if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) {
2046 dprintk("<-- %s: No fs_locations data, migration skipped\n",
2047 __func__);
2048 goto out;
2049 }
2050
Trond Myklebust8aafd2f2018-08-11 11:52:38 -04002051 status = nfs4_begin_drain_session(clp);
2052 if (status != 0)
2053 return status;
Chuck Leverc9fdeb22013-10-17 14:13:02 -04002054
2055 status = nfs4_replace_transport(server, locations);
2056 if (status != 0) {
2057 dprintk("<-- %s: failed to replace transport: %d\n",
2058 __func__, status);
2059 goto out;
2060 }
2061
2062 result = 0;
2063 dprintk("<-- %s: migration succeeded\n", __func__);
2064
2065out:
2066 if (page != NULL)
2067 __free_page(page);
2068 kfree(locations);
2069 if (result) {
2070 pr_err("NFS: migration recovery failed (server %s)\n",
2071 clp->cl_hostname);
2072 set_bit(NFS_MIG_FAILED, &server->mig_status);
2073 }
2074 return result;
2075}
2076
2077/*
2078 * Returns zero or a negative NFS4ERR status code.
2079 */
2080static int nfs4_handle_migration(struct nfs_client *clp)
2081{
2082 const struct nfs4_state_maintenance_ops *ops =
2083 clp->cl_mvops->state_renewal_ops;
2084 struct nfs_server *server;
2085 struct rpc_cred *cred;
2086
2087 dprintk("%s: migration reported on \"%s\"\n", __func__,
2088 clp->cl_hostname);
2089
2090 spin_lock(&clp->cl_lock);
2091 cred = ops->get_state_renewal_cred_locked(clp);
2092 spin_unlock(&clp->cl_lock);
2093 if (cred == NULL)
2094 return -NFS4ERR_NOENT;
2095
2096 clp->cl_mig_gen++;
2097restart:
2098 rcu_read_lock();
2099 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2100 int status;
2101
2102 if (server->mig_gen == clp->cl_mig_gen)
2103 continue;
2104 server->mig_gen = clp->cl_mig_gen;
2105
2106 if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION,
2107 &server->mig_status))
2108 continue;
2109
2110 rcu_read_unlock();
2111 status = nfs4_try_migration(server, cred);
2112 if (status < 0) {
2113 put_rpccred(cred);
2114 return status;
2115 }
2116 goto restart;
2117 }
2118 rcu_read_unlock();
2119 put_rpccred(cred);
2120 return 0;
2121}
2122
Chuck Leverb7f7a662013-10-17 14:13:35 -04002123/*
2124 * Test each nfs_server on the clp's cl_superblocks list to see
2125 * if it's moved to another server. Stop when the server no longer
2126 * returns NFS4ERR_LEASE_MOVED.
2127 */
2128static int nfs4_handle_lease_moved(struct nfs_client *clp)
2129{
2130 const struct nfs4_state_maintenance_ops *ops =
2131 clp->cl_mvops->state_renewal_ops;
2132 struct nfs_server *server;
2133 struct rpc_cred *cred;
2134
2135 dprintk("%s: lease moved reported on \"%s\"\n", __func__,
2136 clp->cl_hostname);
2137
2138 spin_lock(&clp->cl_lock);
2139 cred = ops->get_state_renewal_cred_locked(clp);
2140 spin_unlock(&clp->cl_lock);
2141 if (cred == NULL)
2142 return -NFS4ERR_NOENT;
2143
2144 clp->cl_mig_gen++;
2145restart:
2146 rcu_read_lock();
2147 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
2148 struct inode *inode;
2149 int status;
2150
2151 if (server->mig_gen == clp->cl_mig_gen)
2152 continue;
2153 server->mig_gen = clp->cl_mig_gen;
2154
2155 rcu_read_unlock();
2156
David Howells2b0143b2015-03-17 22:25:59 +00002157 inode = d_inode(server->super->s_root);
Chuck Leverb7f7a662013-10-17 14:13:35 -04002158 status = nfs4_proc_fsid_present(inode, cred);
2159 if (status != -NFS4ERR_MOVED)
2160 goto restart; /* wasn't this one */
2161 if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
2162 goto restart; /* there are more */
2163 goto out;
2164 }
2165 rcu_read_unlock();
2166
2167out:
2168 put_rpccred(cred);
2169 return 0;
2170}
2171
Chuck Lever05f4c352012-09-14 17:24:32 -04002172/**
2173 * nfs4_discover_server_trunking - Detect server IP address trunking
2174 *
2175 * @clp: nfs_client under test
2176 * @result: OUT: found nfs_client, or clp
2177 *
2178 * Returns zero or a negative errno. If zero is returned,
2179 * an nfs_client pointer is planted in "result".
2180 *
2181 * Note: since we are invoked in process context, and
2182 * not from inside the state manager, we cannot use
2183 * nfs4_handle_reclaim_lease_error().
2184 */
2185int nfs4_discover_server_trunking(struct nfs_client *clp,
2186 struct nfs_client **result)
2187{
2188 const struct nfs4_state_recovery_ops *ops =
2189 clp->cl_mvops->reboot_recovery_ops;
Chuck Lever05f4c352012-09-14 17:24:32 -04002190 struct rpc_clnt *clnt;
2191 struct rpc_cred *cred;
Chuck Lever4edaa302013-03-16 15:56:20 -04002192 int i, status;
Chuck Lever05f4c352012-09-14 17:24:32 -04002193
2194 dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname);
2195
Chuck Lever05f4c352012-09-14 17:24:32 -04002196 clnt = clp->cl_rpcclient;
Chuck Lever05f4c352012-09-14 17:24:32 -04002197 i = 0;
2198
2199 mutex_lock(&nfs_clid_init_mutex);
Chuck Lever05f4c352012-09-14 17:24:32 -04002200again:
Trond Myklebustea33e6c2013-04-05 13:22:50 -04002201 status = -ENOENT;
Chuck Lever73d8bde2013-07-24 12:28:37 -04002202 cred = nfs4_get_clid_cred(clp);
Chuck Lever05f4c352012-09-14 17:24:32 -04002203 if (cred == NULL)
2204 goto out_unlock;
2205
2206 status = ops->detect_trunking(clp, result, cred);
2207 put_rpccred(cred);
2208 switch (status) {
2209 case 0:
Trond Myklebust898fc112017-06-21 10:16:56 -04002210 case -EINTR:
2211 case -ERESTARTSYS:
Chuck Lever05f4c352012-09-14 17:24:32 -04002212 break;
Chuck Lever05f4c352012-09-14 17:24:32 -04002213 case -ETIMEDOUT:
Trond Myklebust150e7262014-03-18 14:23:11 -04002214 if (clnt->cl_softrtry)
2215 break;
Gustavo A. R. Silva01e03bd2018-07-31 21:18:44 -05002216 /* Fall through */
Trond Myklebust150e7262014-03-18 14:23:11 -04002217 case -NFS4ERR_DELAY:
Chuck Lever05f4c352012-09-14 17:24:32 -04002218 case -EAGAIN:
2219 ssleep(1);
Gustavo A. R. Silva01e03bd2018-07-31 21:18:44 -05002220 /* Fall through */
Trond Myklebust202c3122013-01-18 22:56:23 -05002221 case -NFS4ERR_STALE_CLIENTID:
Chuck Lever05f4c352012-09-14 17:24:32 -04002222 dprintk("NFS: %s after status %d, retrying\n",
2223 __func__, status);
2224 goto again;
Chuck Lever4edaa302013-03-16 15:56:20 -04002225 case -EACCES:
Chuck Leverd688f7b2013-07-24 12:28:28 -04002226 if (i++ == 0) {
2227 nfs4_root_machine_cred(clp);
2228 goto again;
2229 }
Jeff Layton6d769f12013-11-13 09:08:21 -05002230 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX)
Chuck Lever4edaa302013-03-16 15:56:20 -04002231 break;
Gustavo A. R. Silva01e03bd2018-07-31 21:18:44 -05002232 /* Fall through */
Chuck Lever05f4c352012-09-14 17:24:32 -04002233 case -NFS4ERR_CLID_INUSE:
2234 case -NFS4ERR_WRONGSEC:
Jeff Layton6d769f12013-11-13 09:08:21 -05002235 /* No point in retrying if we already used RPC_AUTH_UNIX */
2236 if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) {
2237 status = -EPERM;
2238 break;
2239 }
Chuck Lever79d852b2013-04-22 15:42:48 -04002240 clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX);
Chuck Lever05f4c352012-09-14 17:24:32 -04002241 if (IS_ERR(clnt)) {
2242 status = PTR_ERR(clnt);
2243 break;
2244 }
Trond Myklebustb193d59a2013-04-04 15:55:00 -04002245 /* Note: this is safe because we haven't yet marked the
2246 * client as ready, so we are the only user of
2247 * clp->cl_rpcclient
2248 */
2249 clnt = xchg(&clp->cl_rpcclient, clnt);
2250 rpc_shutdown_client(clnt);
2251 clnt = clp->cl_rpcclient;
Chuck Lever05f4c352012-09-14 17:24:32 -04002252 goto again;
2253
2254 case -NFS4ERR_MINOR_VERS_MISMATCH:
2255 status = -EPROTONOSUPPORT;
2256 break;
2257
2258 case -EKEYEXPIRED:
Chuck Lever05f4c352012-09-14 17:24:32 -04002259 case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
2260 * in nfs4_exchange_id */
2261 status = -EKEYEXPIRED;
Trond Myklebustea33e6c2013-04-05 13:22:50 -04002262 break;
2263 default:
2264 pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n",
2265 __func__, status);
2266 status = -EIO;
Chuck Lever05f4c352012-09-14 17:24:32 -04002267 }
2268
2269out_unlock:
2270 mutex_unlock(&nfs_clid_init_mutex);
Chuck Lever05f4c352012-09-14 17:24:32 -04002271 dprintk("NFS: %s: status = %d\n", __func__, status);
2272 return status;
2273}
2274
Andy Adamson76db6d92009-04-01 09:22:38 -04002275#ifdef CONFIG_NFS_V4_1
Trond Myklebust9f594792012-05-27 13:02:53 -04002276void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002277{
Trond Myklebust444f72f2011-05-26 14:26:35 -04002278 struct nfs_client *clp = session->clp;
2279
Trond Myklebust9f594792012-05-27 13:02:53 -04002280 switch (err) {
2281 default:
2282 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2283 break;
2284 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2285 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2286 }
Trond Myklebustd94cbf62016-12-04 19:34:38 -05002287 nfs4_schedule_state_manager(clp);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002288}
Andy Adamsoncbdabc72011-03-01 01:34:20 +00002289EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002290
Anna Schumaker3f10a6a2015-07-13 14:01:31 -04002291void nfs41_notify_server(struct nfs_client *clp)
Trond Myklebustac074832012-11-21 09:06:11 -05002292{
2293 /* Use CHECK_LEASE to ping the server with a SEQUENCE */
2294 set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state);
2295 nfs4_schedule_state_manager(clp);
2296}
2297
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002298static void nfs4_reset_all_state(struct nfs_client *clp)
2299{
2300 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
Chuck Lever2c820d92012-05-21 22:45:33 -04002301 set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state);
Trond Myklebustbe0bfed2012-05-25 16:02:15 -04002302 clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002303 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002304 dprintk("%s: scheduling reset of all state for server %s!\n",
2305 __func__, clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002306 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002307 }
2308}
2309
2310static void nfs41_handle_server_reboot(struct nfs_client *clp)
2311{
2312 if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) {
2313 nfs4_state_start_reclaim_reboot(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002314 dprintk("%s: server %s rebooted!\n", __func__,
2315 clp->cl_hostname);
Trond Myklebust0400a6b2011-03-09 16:00:53 -05002316 nfs4_schedule_state_manager(clp);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002317 }
2318}
2319
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002320static void nfs41_handle_all_state_revoked(struct nfs_client *clp)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002321{
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002322 nfs4_reset_all_state(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002323 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002324}
2325
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002326static void nfs41_handle_some_state_revoked(struct nfs_client *clp)
2327{
Trond Myklebust45870d62016-09-22 13:38:59 -04002328 nfs4_state_start_reclaim_nograce(clp);
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002329 nfs4_schedule_state_manager(clp);
2330
2331 dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname);
2332}
2333
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002334static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp)
2335{
Trond Myklebust40992872015-07-05 15:20:53 -04002336 /* FIXME: For now, we destroy all layouts. */
2337 pnfs_destroy_all_layouts(clp);
2338 /* FIXME: For now, we test all delegations+open state+locks. */
2339 nfs41_handle_some_state_revoked(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002340 dprintk("%s: Recallable state revoked on server %s!\n", __func__,
2341 clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002342}
2343
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002344static void nfs41_handle_backchannel_fault(struct nfs_client *clp)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002345{
Trond Myklebustb1352902015-07-05 15:26:58 -04002346 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2347 nfs4_schedule_state_manager(clp);
2348
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002349 dprintk("%s: server %s declared a backchannel fault\n", __func__,
2350 clp->cl_hostname);
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002351}
2352
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002353static void nfs41_handle_cb_path_down(struct nfs_client *clp)
2354{
2355 if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
2356 &clp->cl_state) == 0)
2357 nfs4_schedule_state_manager(clp);
2358}
2359
Trond Myklebust0a014a42016-09-22 13:38:51 -04002360void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
2361 bool recovery)
Alexandros Batsakis0629e372009-12-05 13:46:14 -05002362{
2363 if (!flags)
2364 return;
Chuck Lever2c820d92012-05-21 22:45:33 -04002365
2366 dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
2367 __func__, clp->cl_hostname, clp->cl_clientid, flags);
Trond Myklebust0a014a42016-09-22 13:38:51 -04002368 /*
2369 * If we're called from the state manager thread, then assume we're
2370 * already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
2371 * Those flags are expected to remain set until we're done
2372 * recovering (see RFC5661, section 18.46.3).
2373 */
2374 if (recovery)
2375 goto out_recovery;
Chuck Lever2c820d92012-05-21 22:45:33 -04002376
Trond Myklebust111d4892011-12-01 16:37:42 -05002377 if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002378 nfs41_handle_server_reboot(clp);
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002379 if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED))
2380 nfs41_handle_all_state_revoked(clp);
2381 if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED |
Chuck Leverd1c23312013-10-17 14:13:58 -04002382 SEQ4_STATUS_ADMIN_STATE_REVOKED))
Trond Myklebust8b895ce2015-07-05 15:12:06 -04002383 nfs41_handle_some_state_revoked(clp);
Chuck Leverd1c23312013-10-17 14:13:58 -04002384 if (flags & SEQ4_STATUS_LEASE_MOVED)
2385 nfs4_schedule_lease_moved_recovery(clp);
Trond Myklebust111d4892011-12-01 16:37:42 -05002386 if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002387 nfs41_handle_recallable_state_revoked(clp);
Trond Myklebust0a014a42016-09-22 13:38:51 -04002388out_recovery:
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002389 if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
2390 nfs41_handle_backchannel_fault(clp);
2391 else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |
2392 SEQ4_STATUS_CB_PATH_DOWN_SESSION))
Trond Myklebust0f79fd62010-03-02 13:06:21 -05002393 nfs41_handle_cb_path_down(clp);
Alexandros Batsakis0629e372009-12-05 13:46:14 -05002394}
2395
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002396static int nfs4_reset_session(struct nfs_client *clp)
2397{
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002398 struct rpc_cred *cred;
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002399 int status;
2400
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002401 if (!nfs4_has_session(clp))
2402 return 0;
Trond Myklebust8aafd2f2018-08-11 11:52:38 -04002403 status = nfs4_begin_drain_session(clp);
2404 if (status != 0)
2405 return status;
Chuck Lever73d8bde2013-07-24 12:28:37 -04002406 cred = nfs4_get_clid_cred(clp);
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002407 status = nfs4_proc_destroy_session(clp->cl_session, cred);
Trond Myklebustc489ee22013-01-30 13:04:10 -05002408 switch (status) {
2409 case 0:
2410 case -NFS4ERR_BADSESSION:
2411 case -NFS4ERR_DEADSESSION:
2412 break;
2413 case -NFS4ERR_BACK_CHAN_BUSY:
2414 case -NFS4ERR_DELAY:
2415 set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
2416 status = 0;
2417 ssleep(1);
2418 goto out;
2419 default:
Ricardo Labiagaf4558482009-12-07 09:16:09 -05002420 status = nfs4_recovery_handle_error(clp, status);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002421 goto out;
2422 }
2423
2424 memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002425 status = nfs4_proc_create_session(clp, cred);
Andy Adamson41f54a52010-01-21 14:54:13 -05002426 if (status) {
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002427 dprintk("%s: session reset failed with status %d for server %s!\n",
2428 __func__, status, clp->cl_hostname);
Trond Myklebustf2c1b512012-05-27 14:46:46 -04002429 status = nfs4_handle_reclaim_lease_error(clp, status);
Andy Adamson41f54a52010-01-21 14:54:13 -05002430 goto out;
2431 }
Trond Myklebustbda197f2012-06-05 10:22:14 -04002432 nfs41_finish_session_reset(clp);
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002433 dprintk("%s: session reset was successful for server %s!\n",
2434 __func__, clp->cl_hostname);
Andy Adamson41f54a52010-01-21 14:54:13 -05002435out:
Trond Myklebust848f5bd2012-05-25 17:51:23 -04002436 if (cred)
2437 put_rpccred(cred);
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002438 return status;
2439}
Andy Adamson76db6d92009-04-01 09:22:38 -04002440
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002441static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2442{
Trond Myklebust2cf047c2012-05-25 17:57:41 -04002443 struct rpc_cred *cred;
2444 int ret;
2445
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002446 if (!nfs4_has_session(clp))
2447 return 0;
Trond Myklebust8aafd2f2018-08-11 11:52:38 -04002448 ret = nfs4_begin_drain_session(clp);
2449 if (ret != 0)
2450 return ret;
Chuck Lever73d8bde2013-07-24 12:28:37 -04002451 cred = nfs4_get_clid_cred(clp);
Trond Myklebust2cf047c2012-05-25 17:57:41 -04002452 ret = nfs4_proc_bind_conn_to_session(clp, cred);
2453 if (cred)
2454 put_rpccred(cred);
Trond Myklebust43ac5442012-05-27 13:47:21 -04002455 clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
Trond Myklebustbf674c82012-05-27 12:53:10 -04002456 switch (ret) {
2457 case 0:
Trond Myklebustcc0a9842012-05-28 15:12:27 -04002458 dprintk("%s: bind_conn_to_session was successful for server %s!\n",
2459 __func__, clp->cl_hostname);
Trond Myklebustbf674c82012-05-27 12:53:10 -04002460 break;
2461 case -NFS4ERR_DELAY:
2462 ssleep(1);
2463 set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state);
2464 break;
2465 default:
2466 return nfs4_recovery_handle_error(clp, ret);
2467 }
2468 return 0;
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002469}
Andy Adamson76db6d92009-04-01 09:22:38 -04002470#else /* CONFIG_NFS_V4_1 */
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002471static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002472
2473static int nfs4_bind_conn_to_session(struct nfs_client *clp)
2474{
2475 return 0;
2476}
Andy Adamson76db6d92009-04-01 09:22:38 -04002477#endif /* CONFIG_NFS_V4_1 */
2478
Trond Myklebuste005e802008-12-23 15:21:48 -05002479static void nfs4_state_manager(struct nfs_client *clp)
Trond Myklebust02860012008-12-23 15:21:40 -05002480{
Trond Myklebust02860012008-12-23 15:21:40 -05002481 int status = 0;
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002482 const char *section = "", *section_sep = "";
Trond Myklebust02860012008-12-23 15:21:40 -05002483
Trond Myklebust02860012008-12-23 15:21:40 -05002484 /* Ensure exclusive access to NFSv4 state */
Trond Myklebust47c21992011-04-15 17:34:18 -04002485 do {
Chuck Lever2c820d92012-05-21 22:45:33 -04002486 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002487 section = "purge state";
Trond Myklebustb42353f2012-06-05 11:19:47 -04002488 status = nfs4_purge_lease(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002489 if (status < 0)
2490 goto out_error;
Trond Myklebustb42353f2012-06-05 11:19:47 -04002491 continue;
Chuck Lever2c820d92012-05-21 22:45:33 -04002492 }
2493
Trond Myklebustb42353f2012-06-05 11:19:47 -04002494 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002495 section = "lease expired";
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002496 /* We're going to have to re-establish a clientid */
2497 status = nfs4_reclaim_lease(clp);
Trond Myklebust2a6ee6a2012-05-25 15:00:06 -04002498 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002499 goto out_error;
Trond Myklebustb42353f2012-06-05 11:19:47 -04002500 continue;
Trond Myklebuste598d842008-12-23 15:21:42 -05002501 }
2502
Andy Adamsonc3fad1b2009-04-01 09:22:39 -04002503 /* Initialize or reset the session */
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002504 if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002505 section = "reset session";
Andy Adamson4d643d12009-12-04 15:52:24 -05002506 status = nfs4_reset_session(clp);
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002507 if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
2508 continue;
2509 if (status < 0)
Andy Adamson76db6d92009-04-01 09:22:38 -04002510 goto out_error;
Andy Adamson76db6d92009-04-01 09:22:38 -04002511 }
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002512
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002513 /* Send BIND_CONN_TO_SESSION */
2514 if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION,
Trond Myklebust1a47e7a2012-06-05 10:53:38 -04002515 &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002516 section = "bind conn to session";
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002517 status = nfs4_bind_conn_to_session(clp);
2518 if (status < 0)
2519 goto out_error;
Trond Myklebustbf674c82012-05-27 12:53:10 -04002520 continue;
Weston Andros Adamsona9e64442012-05-24 12:26:37 -04002521 }
2522
Trond Myklebust5df904a2012-11-21 09:22:14 -05002523 if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) {
2524 section = "check lease";
2525 status = nfs4_check_lease(clp);
2526 if (status < 0)
2527 goto out_error;
Olga Kornievskaia8faaa6d2014-09-24 18:11:28 -04002528 continue;
Chuck Leverc9fdeb22013-10-17 14:13:02 -04002529 }
2530
2531 if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) {
2532 section = "migration";
2533 status = nfs4_handle_migration(clp);
2534 if (status < 0)
2535 goto out_error;
Trond Myklebust5df904a2012-11-21 09:22:14 -05002536 }
2537
Chuck Leverb7f7a662013-10-17 14:13:35 -04002538 if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
2539 section = "lease moved";
2540 status = nfs4_handle_lease_moved(clp);
2541 if (status < 0)
2542 goto out_error;
2543 }
2544
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002545 /* First recover reboot state... */
Trond Myklebuste345e882009-12-03 15:52:41 -05002546 if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002547 section = "reclaim reboot";
Andy Adamson591d71c2009-04-01 09:22:47 -04002548 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04002549 clp->cl_mvops->reboot_recovery_ops);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002550 if (status == -EAGAIN)
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002551 continue;
2552 if (status < 0)
2553 goto out_error;
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002554 nfs4_state_end_reclaim_reboot(clp);
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002555 }
2556
Trond Myklebust45870d62016-09-22 13:38:59 -04002557 /* Detect expired delegations... */
2558 if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) {
2559 section = "detect expired delegations";
2560 nfs_reap_expired_delegations(clp);
2561 continue;
2562 }
2563
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002564 /* Now recover expired state... */
2565 if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) {
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002566 section = "reclaim nograce";
Andy Adamson591d71c2009-04-01 09:22:47 -04002567 status = nfs4_do_reclaim(clp,
Trond Myklebustc48f4f32010-06-16 09:52:27 -04002568 clp->cl_mvops->nograce_recovery_ops);
Trond Myklebustdf817ba32014-09-27 17:41:51 -04002569 if (status == -EAGAIN)
Trond Myklebustb6d408b2009-12-03 15:53:22 -05002570 continue;
2571 if (status < 0)
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002572 goto out_error;
Trond Myklebustb79a4a12008-12-23 15:21:41 -05002573 }
Trond Myklebust707fb4b2008-12-23 15:21:47 -05002574
Alexandros Batsakis5601a002009-12-14 21:27:58 -08002575 nfs4_end_drain_session(clp);
Trond Myklebust707fb4b2008-12-23 15:21:47 -05002576 if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
2577 nfs_client_return_marked_delegations(clp);
2578 continue;
2579 }
Trond Myklebuste005e802008-12-23 15:21:48 -05002580
2581 nfs4_clear_state_manager_bit(clp);
Trond Myklebustf3c76492008-12-23 15:21:48 -05002582 /* Did we race with an attempt to give us more work? */
2583 if (clp->cl_state == 0)
2584 break;
2585 if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
2586 break;
Elena Reshetova212bf412017-10-20 12:53:38 +03002587 } while (refcount_read(&clp->cl_count) > 1);
Trond Myklebuste005e802008-12-23 15:21:48 -05002588 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589out_error:
Weston Andros Adamson8ed27d42012-05-29 15:57:59 -04002590 if (strlen(section))
2591 section_sep = ": ";
2592 pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s"
2593 " with error %d\n", section_sep, section,
2594 clp->cl_hostname, -status);
Chuck Leverffe5a832012-09-14 17:23:23 -04002595 ssleep(1);
Alexandros Batsakis5601a002009-12-14 21:27:58 -08002596 nfs4_end_drain_session(clp);
Trond Myklebuste005e802008-12-23 15:21:48 -05002597 nfs4_clear_state_manager_bit(clp);
2598}
2599
2600static int nfs4_run_state_manager(void *ptr)
2601{
2602 struct nfs_client *clp = ptr;
2603
2604 allow_signal(SIGKILL);
2605 nfs4_state_manager(clp);
2606 nfs_put_client(clp);
2607 module_put_and_exit(0);
2608 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609}
2610
2611/*
2612 * Local variables:
2613 * c-basic-offset: 8
2614 * End:
2615 */