2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
35 * NFSIOD operations - now built into the kernel.
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/malloc.h>
41 #include <sys/mount.h>
42 #include <sys/kernel.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>
58 #include <sys/signal2.h>
59 #include <sys/thread2.h>
60 #include <sys/mutex2.h>
61 #include <sys/mplock2.h>
63 #include <netinet/in.h>
64 #include <netinet/tcp.h>
70 #include "nfsm_subs.h"
76 * nfs service connection reader thread
79 nfssvc_iod_reader(void *arg)
81 struct nfsmount *nmp = arg;
82 struct nfsm_info *info;
88 if (nmp->nm_rxstate == NFSSVC_INIT)
89 nmp->nm_rxstate = NFSSVC_PENDING;
92 if (nmp->nm_rxstate == NFSSVC_WAITING) {
93 if (TAILQ_FIRST(&nmp->nm_reqq) == NULL &&
94 TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) {
95 tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0);
98 * This can happen during shutdown, we don't
101 error = nfs_reply(nmp, NULL);
102 if (error && error != EWOULDBLOCK) {
103 tsleep(&nmp->nm_rxstate, 0,
109 if (nmp->nm_rxstate != NFSSVC_PENDING)
111 nmp->nm_rxstate = NFSSVC_WAITING;
114 * Process requests which have received replies. Only
115 * process the post-reply states. If we get EINPROGRESS
116 * it means the request went back to an auth or retransmit
117 * state and we let the iod_writer thread deal with it.
119 * Any lock on the request is strictly temporary due to
122 * If the request completes we run the info->done call
123 * to finish up the I/O.
125 while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) {
126 if (req->r_flags & R_LOCKED) {
127 while (req->r_flags & R_LOCKED) {
128 req->r_flags |= R_WANTED;
129 tsleep(req, 0, "nfstrac", 0);
133 TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain);
137 info->error = nfs_request(info,
138 NFSM_STATE_PROCESSREPLY,
140 if (info->error == EINPROGRESS) {
141 kprintf("rxq: move info %p back to txq\n", info);
142 TAILQ_INSERT_TAIL(&nmp->nm_reqtxq, req, r_chain);
143 nfssvc_iod_writer_wakeup(nmp);
145 atomic_subtract_int(&nmp->nm_bioqlen, 1);
152 nmp->nm_rxthread = NULL;
153 nmp->nm_rxstate = NFSSVC_DONE;
154 wakeup(&nmp->nm_rxthread);
158 * nfs service connection writer thread
160 * The writer sits on the send side of the client's socket and
161 * does both the initial processing of BIOs and also transmission
162 * and retransmission of nfsreq's.
164 * The writer processes both new BIOs from nm_bioq and retransmit
165 * or state machine jumpbacks from nm_reqtxq
168 nfssvc_iod_writer(void *arg)
170 struct nfsmount *nmp = arg;
178 if (nmp->nm_txstate == NFSSVC_INIT)
179 nmp->nm_txstate = NFSSVC_PENDING;
183 if (nmp->nm_txstate == NFSSVC_WAITING) {
184 tsleep(&nmp->nm_txstate, 0, "nfsidl", 0);
187 if (nmp->nm_txstate != NFSSVC_PENDING)
189 nmp->nm_txstate = NFSSVC_WAITING;
192 * Eep, we could blow out the mbuf allocator if we just
193 * did everything the kernel wanted us to do.
195 while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) {
196 if (nmp->nm_reqqlen > nfs_maxasyncbio)
198 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
199 vp = bio->bio_driver_info;
201 nfs_startio(vp, bio, NULL);
206 * Process reauths & retransmits. If we get an EINPROGRESS
207 * it means the state transitioned to WAITREPLY or later.
208 * Otherwise the request completed (probably with an error
209 * since we didn't get to a replied state).
211 while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) {
212 TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain);
216 info->error = nfs_request(info,
218 NFSM_STATE_WAITREPLY);
220 if (info->error == EINPROGRESS) {
223 atomic_subtract_int(&nmp->nm_bioqlen, 1);
229 nmp->nm_txthread = NULL;
230 nmp->nm_txstate = NFSSVC_DONE;
231 wakeup(&nmp->nm_txthread);
235 nfssvc_iod_stop1(struct nfsmount *nmp)
238 nmp->nm_txstate = NFSSVC_STOPPING;
239 nmp->nm_rxstate = NFSSVC_STOPPING;
244 nfssvc_iod_stop2(struct nfsmount *nmp)
246 wakeup(&nmp->nm_txstate);
247 while (nmp->nm_txthread)
248 tsleep(&nmp->nm_txthread, 0, "nfssttx", hz*2);
249 wakeup(&nmp->nm_rxstate);
250 while (nmp->nm_rxthread)
251 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", hz*2);
255 nfssvc_iod_writer_wakeup(struct nfsmount *nmp)
257 if (nmp->nm_txstate == NFSSVC_WAITING) {
258 nmp->nm_txstate = NFSSVC_PENDING;
259 wakeup(&nmp->nm_txstate);
264 nfssvc_iod_reader_wakeup(struct nfsmount *nmp)
266 if (nmp->nm_rxstate == NFSSVC_WAITING) {
267 nmp->nm_rxstate = NFSSVC_PENDING;
268 wakeup(&nmp->nm_rxstate);