7ec8ea5f7ecc727cec603f6128533b86a667d22a
[dragonfly.git] / sys / vfs / nfs / nfs_iod.c
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>
59 #include <sys/mutex2.h>
60
61 #include <netinet/in.h>
62 #include <netinet/tcp.h>
63 #include <sys/thread2.h>
64
65 #include "rpcv2.h"
66 #include "nfsproto.h"
67 #include "nfs.h"
68 #include "xdr_subs.h"
69 #include "nfsm_subs.h"
70 #include "nfsmount.h"
71 #include "nfsnode.h"
72 #include "nfsrtt.h"
73
74 void
75 nfssvc_iod_reader(void *arg)
76 {
77         struct nfsmount *nmp = arg;
78
79         if (nmp->nm_rxstate == NFSSVC_INIT)
80                 nmp->nm_rxstate = NFSSVC_PENDING;
81         for (;;) {
82                 if (nmp->nm_rxstate == NFSSVC_WAITING) {
83                         tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0);
84                         continue;
85                 }
86                 if (nmp->nm_rxstate != NFSSVC_PENDING)
87                         break;
88                 nmp->nm_rxstate = NFSSVC_WAITING;
89
90 #if 0
91                 error = tsleep((caddr_t)&nfs_iodwant[myiod],
92                         PCATCH, "nfsidl", 0);
93 #endif
94         }
95         nmp->nm_rxthread = NULL;
96         nmp->nm_rxstate = NFSSVC_DONE;
97         wakeup(&nmp->nm_rxthread);
98 }
99
100 /*
101  * The writer sits on the send side of the client's socket and
102  * does both the initial processing of BIOs and also transmission
103  * and retransmission of nfsreq's.
104  */
105 void
106 nfssvc_iod_writer(void *arg)
107 {
108         struct nfsmount *nmp = arg;
109         struct bio *bio;
110         struct vnode *vp;
111
112         if (nmp->nm_txstate == NFSSVC_INIT)
113                 nmp->nm_txstate = NFSSVC_PENDING;
114         for (;;) {
115                 if (nmp->nm_txstate == NFSSVC_WAITING) {
116                         tsleep(&nmp->nm_txstate, 0, "nfsidl", 0);
117                         continue;
118                 }
119                 if (nmp->nm_txstate != NFSSVC_PENDING)
120                         break;
121                 nmp->nm_txstate = NFSSVC_WAITING;
122
123                 while (nmp->nm_bioqlen && nmp->nm_reqqlen < 32) {
124                         bio = TAILQ_FIRST(&nmp->nm_bioq);
125                         KKASSERT(bio);
126                         TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
127                         nmp->nm_bioqlen--;
128                         vp = bio->bio_driver_info;
129                         nfs_doio(vp, bio, NULL);
130                 }
131         }
132         nmp->nm_txthread = NULL;
133         nmp->nm_txstate = NFSSVC_DONE;
134         wakeup(&nmp->nm_txthread);
135 }
136
137 void
138 nfssvc_iod_stop(struct nfsmount *nmp)
139 {
140         nmp->nm_txstate = NFSSVC_STOPPING;
141         wakeup(&nmp->nm_txstate);
142         while (nmp->nm_txthread)
143                 tsleep(&nmp->nm_txthread, 0, "nfssttx", 0);
144
145         nmp->nm_rxstate = NFSSVC_STOPPING;
146         wakeup(&nmp->nm_rxstate);
147         while (nmp->nm_rxthread)
148                 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", 0);
149 }
150
151 void
152 nfssvc_iod_writer_wakeup(struct nfsmount *nmp)
153 {
154         if (nmp->nm_txstate == NFSSVC_WAITING) {
155                 nmp->nm_txstate = NFSSVC_PENDING;
156                 wakeup(&nmp->nm_txstate);
157         }
158 }