network - Tokenize NFS, fix MP races
[dragonfly.git] / sys / vfs / nfs / nfs_iod.c
CommitLineData
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1/*
2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34/*
35 * NFSIOD operations - now built into the kernel.
36 */
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/proc.h>
40#include <sys/malloc.h>
41#include <sys/mount.h>
42#include <sys/kernel.h>
43#include <sys/mbuf.h>
44#include <sys/vnode.h>
45#include <sys/fcntl.h>
46#include <sys/protosw.h>
47#include <sys/resourcevar.h>
48#include <sys/socket.h>
49#include <sys/socketvar.h>
50#include <sys/socketops.h>
51#include <sys/syslog.h>
52#include <sys/thread.h>
53#include <sys/tprintf.h>
54#include <sys/sysctl.h>
55#include <sys/signalvar.h>
56#include <sys/mutex.h>
57
58#include <sys/signal2.h>
c9e9fb21 59#include <sys/thread2.h>
52e1cf57 60#include <sys/mutex2.h>
c9e9fb21 61#include <sys/mplock2.h>
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62
63#include <netinet/in.h>
64#include <netinet/tcp.h>
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65
66#include "rpcv2.h"
67#include "nfsproto.h"
68#include "nfs.h"
69#include "xdr_subs.h"
70#include "nfsm_subs.h"
71#include "nfsmount.h"
72#include "nfsnode.h"
73#include "nfsrtt.h"
74
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75/*
76 * nfs service connection reader thread
77 */
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78void
79nfssvc_iod_reader(void *arg)
80{
81 struct nfsmount *nmp = arg;
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82 struct nfsm_info *info;
83 struct nfsreq *req;
84 int error;
52e1cf57 85
c6b43e93 86 lwkt_gettoken(&nmp->nm_token);
c9e9fb21 87
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88 if (nmp->nm_rxstate == NFSSVC_INIT)
89 nmp->nm_rxstate = NFSSVC_PENDING;
90 for (;;) {
91 if (nmp->nm_rxstate == NFSSVC_WAITING) {
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92 if (TAILQ_FIRST(&nmp->nm_reqq) == NULL &&
93 TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) {
94 tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0);
95 } else {
96 /*
97 * This can happen during shutdown, we don't
98 * want to hardloop.
99 */
100 error = nfs_reply(nmp, NULL);
101 if (error && error != EWOULDBLOCK) {
102 tsleep(&nmp->nm_rxstate, 0,
103 "nfsxxx", hz / 10);
104 }
105 }
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106 continue;
107 }
108 if (nmp->nm_rxstate != NFSSVC_PENDING)
109 break;
110 nmp->nm_rxstate = NFSSVC_WAITING;
111
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112 /*
113 * Process requests which have received replies. Only
114 * process the post-reply states. If we get EINPROGRESS
115 * it means the request went back to an auth or retransmit
116 * state and we let the iod_writer thread deal with it.
117 *
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118 * Any lock on the request is strictly temporary due to
119 * MP races (XXX).
120 *
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121 * If the request completes we run the info->done call
122 * to finish up the I/O.
123 */
124 while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) {
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125 if (req->r_flags & R_LOCKED) {
126 while (req->r_flags & R_LOCKED) {
127 req->r_flags |= R_WANTED;
128 tsleep(req, 0, "nfstrac", 0);
129 }
130 continue;
131 }
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132 TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain);
133 info = req->r_info;
134 KKASSERT(info);
135 info->error = nfs_request(info,
136 NFSM_STATE_PROCESSREPLY,
137 NFSM_STATE_DONE);
138 if (info->error == EINPROGRESS) {
139 kprintf("rxq: move info %p back to txq\n", info);
140 TAILQ_INSERT_TAIL(&nmp->nm_reqtxq, req, r_chain);
141 nfssvc_iod_writer_wakeup(nmp);
142 } else {
f8565b0f 143 atomic_subtract_int(&nmp->nm_bioqlen, 1);
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144 info->done(info);
145 }
146 }
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147 }
148 nmp->nm_rxthread = NULL;
149 nmp->nm_rxstate = NFSSVC_DONE;
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150
151 lwkt_reltoken(&nmp->nm_token);
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152 wakeup(&nmp->nm_rxthread);
153}
154
155/*
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156 * nfs service connection writer thread
157 *
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158 * The writer sits on the send side of the client's socket and
159 * does both the initial processing of BIOs and also transmission
160 * and retransmission of nfsreq's.
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161 *
162 * The writer processes both new BIOs from nm_bioq and retransmit
163 * or state machine jumpbacks from nm_reqtxq
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164 */
165void
166nfssvc_iod_writer(void *arg)
167{
168 struct nfsmount *nmp = arg;
169 struct bio *bio;
edb90c22 170 struct nfsreq *req;
52e1cf57 171 struct vnode *vp;
edb90c22 172 nfsm_info_t info;
52e1cf57 173
c6b43e93 174 lwkt_gettoken(&nmp->nm_token);
c9e9fb21 175
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176 if (nmp->nm_txstate == NFSSVC_INIT)
177 nmp->nm_txstate = NFSSVC_PENDING;
c9e9fb21 178
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179 for (;;) {
180 if (nmp->nm_txstate == NFSSVC_WAITING) {
181 tsleep(&nmp->nm_txstate, 0, "nfsidl", 0);
182 continue;
183 }
184 if (nmp->nm_txstate != NFSSVC_PENDING)
185 break;
186 nmp->nm_txstate = NFSSVC_WAITING;
187
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188 /*
189 * Eep, we could blow out the mbuf allocator if we just
190 * did everything the kernel wanted us to do.
191 */
f8565b0f 192 while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) {
b9a7a2bd 193 if (nmp->nm_reqqlen > nfs_maxasyncbio)
cc7d050e 194 break;
52e1cf57 195 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
52e1cf57 196 vp = bio->bio_driver_info;
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197 nfs_startio(vp, bio, NULL);
198 }
199
200 /*
201 * Process reauths & retransmits. If we get an EINPROGRESS
202 * it means the state transitioned to WAITREPLY or later.
203 * Otherwise the request completed (probably with an error
204 * since we didn't get to a replied state).
205 */
206 while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) {
207 TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain);
208 info = req->r_info;
209 KKASSERT(info);
210 info->error = nfs_request(info,
211 NFSM_STATE_AUTH,
212 NFSM_STATE_WAITREPLY);
213 if (info->error == EINPROGRESS) {
f8565b0f 214 ;
edb90c22 215 } else {
f8565b0f 216 atomic_subtract_int(&nmp->nm_bioqlen, 1);
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217 info->done(info);
218 }
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219 }
220 }
221 nmp->nm_txthread = NULL;
222 nmp->nm_txstate = NFSSVC_DONE;
c6b43e93 223 lwkt_reltoken(&nmp->nm_token);
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224 wakeup(&nmp->nm_txthread);
225}
226
227void
13ddc895 228nfssvc_iod_stop1(struct nfsmount *nmp)
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229{
230 nmp->nm_txstate = NFSSVC_STOPPING;
13ddc895 231 nmp->nm_rxstate = NFSSVC_STOPPING;
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232}
233
234void
235nfssvc_iod_stop2(struct nfsmount *nmp)
236{
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237 wakeup(&nmp->nm_txstate);
238 while (nmp->nm_txthread)
a63246d1 239 tsleep(&nmp->nm_txthread, 0, "nfssttx", hz*2);
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240 wakeup(&nmp->nm_rxstate);
241 while (nmp->nm_rxthread)
a63246d1 242 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", hz*2);
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243}
244
245void
246nfssvc_iod_writer_wakeup(struct nfsmount *nmp)
247{
248 if (nmp->nm_txstate == NFSSVC_WAITING) {
249 nmp->nm_txstate = NFSSVC_PENDING;
250 wakeup(&nmp->nm_txstate);
251 }
252}
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253
254void
255nfssvc_iod_reader_wakeup(struct nfsmount *nmp)
256{
257 if (nmp->nm_rxstate == NFSSVC_WAITING) {
258 nmp->nm_rxstate = NFSSVC_PENDING;
259 wakeup(&nmp->nm_rxstate);
260 }
261}