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 }