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>
57 #include <sys/signal2.h>
59 #include <netinet/in.h>
60 #include <netinet/tcp.h>
66 #include "nfsm_subs.h"
72 * nfs service connection reader thread
75 nfssvc_iod_reader(void *arg)
77 struct nfsmount *nmp = arg;
78 struct nfsm_info *info;
82 lwkt_gettoken(&nmp->nm_token);
84 if (nmp->nm_rxstate == NFSSVC_INIT)
85 nmp->nm_rxstate = NFSSVC_PENDING;
87 if (nmp->nm_rxstate == NFSSVC_WAITING) {
88 if (TAILQ_FIRST(&nmp->nm_reqq) == NULL &&
89 TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) {
90 tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0);
93 * This can happen during shutdown, we don't
96 error = nfs_reply(nmp, NULL);
97 if (error && error != EWOULDBLOCK) {
98 tsleep(&nmp->nm_rxstate, 0,
104 if (nmp->nm_rxstate != NFSSVC_PENDING)
106 nmp->nm_rxstate = NFSSVC_WAITING;
109 * Process requests which have received replies. Only
110 * process the post-reply states. If we get EINPROGRESS
111 * it means the request went back to an auth or retransmit
112 * state and we let the iod_writer thread deal with it.
114 * Any lock on the request is strictly temporary due to
117 * If the request completes we run the info->done call
118 * to finish up the I/O.
120 while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) {
121 if (req->r_flags & R_LOCKED) {
122 while (req->r_flags & R_LOCKED) {
123 req->r_flags |= R_WANTED;
124 tsleep(req, 0, "nfstrac", 0);
128 TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain);
131 info->error = nfs_request(info,
132 NFSM_STATE_PROCESSREPLY,
134 if (info->error == EINPROGRESS) {
135 kprintf("rxq: move info %p back to txq\n", info);
136 TAILQ_INSERT_TAIL(&nmp->nm_reqtxq, req, r_chain);
137 nfssvc_iod_writer_wakeup(nmp);
139 atomic_subtract_int(&nmp->nm_bioqlen, 1);
144 nmp->nm_rxthread = NULL;
145 nmp->nm_rxstate = NFSSVC_DONE;
147 lwkt_reltoken(&nmp->nm_token);
148 wakeup(&nmp->nm_rxthread);
152 * nfs service connection writer thread
154 * The writer sits on the send side of the client's socket and
155 * does both the initial processing of BIOs and also transmission
156 * and retransmission of nfsreq's.
158 * The writer processes both new BIOs from nm_bioq and retransmit
159 * or state machine jumpbacks from nm_reqtxq
162 nfssvc_iod_writer(void *arg)
164 struct nfsmount *nmp = arg;
170 lwkt_gettoken(&nmp->nm_token);
172 if (nmp->nm_txstate == NFSSVC_INIT)
173 nmp->nm_txstate = NFSSVC_PENDING;
176 if (nmp->nm_txstate == NFSSVC_WAITING) {
177 tsleep(&nmp->nm_txstate, 0, "nfsidl", 0);
180 if (nmp->nm_txstate != NFSSVC_PENDING)
182 nmp->nm_txstate = NFSSVC_WAITING;
185 * Eep, we could blow out the mbuf allocator if we just
186 * did everything the kernel wanted us to do.
188 while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) {
189 if (nmp->nm_reqqlen > nfs_maxasyncbio)
191 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
192 vp = bio->bio_driver_info;
193 nfs_startio(vp, bio, NULL);
197 * Process reauths & retransmits. If we get an EINPROGRESS
198 * it means the state transitioned to WAITREPLY or later.
199 * Otherwise the request completed (probably with an error
200 * since we didn't get to a replied state).
202 while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) {
203 TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain);
206 info->error = nfs_request(info,
208 NFSM_STATE_WAITREPLY);
209 if (info->error == EINPROGRESS) {
212 atomic_subtract_int(&nmp->nm_bioqlen, 1);
217 nmp->nm_txthread = NULL;
218 nmp->nm_txstate = NFSSVC_DONE;
219 lwkt_reltoken(&nmp->nm_token);
220 wakeup(&nmp->nm_txthread);
224 nfssvc_iod_stop1(struct nfsmount *nmp)
226 nmp->nm_txstate = NFSSVC_STOPPING;
227 nmp->nm_rxstate = NFSSVC_STOPPING;
231 nfssvc_iod_stop2(struct nfsmount *nmp)
233 wakeup(&nmp->nm_txstate);
234 while (nmp->nm_txthread)
235 tsleep(&nmp->nm_txthread, 0, "nfssttx", hz*2);
236 wakeup(&nmp->nm_rxstate);
237 while (nmp->nm_rxthread)
238 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", hz*2);
242 nfssvc_iod_writer_wakeup(struct nfsmount *nmp)
244 if (nmp->nm_txstate == NFSSVC_WAITING) {
245 nmp->nm_txstate = NFSSVC_PENDING;
246 wakeup(&nmp->nm_txstate);
251 nfssvc_iod_reader_wakeup(struct nfsmount *nmp)
253 if (nmp->nm_rxstate == NFSSVC_WAITING) {
254 nmp->nm_rxstate = NFSSVC_PENDING;
255 wakeup(&nmp->nm_rxstate);