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         struct nfsm_info *info;
  79         struct nfsreq *req;
  80         int error;
  81
  82         if (nmp->nm_rxstate == NFSSVC_INIT)
  83                 nmp->nm_rxstate = NFSSVC_PENDING;
  84         for (;;) {
  85                 if (nmp->nm_rxstate == NFSSVC_WAITING) {
  86                         if (TAILQ_FIRST(&nmp->nm_reqq) == NULL &&
  87                             TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) {
  88                                 tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0);
  89                         } else {
  90                                 /*
  91                                  * This can happen during shutdown, we don't
  92                                  * want to hardloop.
  93                                  */
  94                                 error = nfs_reply(nmp, NULL);
  95                                 if (error && error != EWOULDBLOCK) {
  96                                         tsleep(&nmp->nm_rxstate, 0,
  97                                                 "nfsxxx", hz / 10);
  98                                 }
  99                         }
 100                         continue;
 101                 }
 102                 if (nmp->nm_rxstate != NFSSVC_PENDING)
 103                         break;
 104                 nmp->nm_rxstate = NFSSVC_WAITING;
 105
 106                 /*
 107                  * Process requests which have received replies.  Only
 108                  * process the post-reply states.  If we get EINPROGRESS
 109                  * it means the request went back to an auth or retransmit
 110                  * state and we let the iod_writer thread deal with it.
 111                  *
 112                  * If the request completes we run the info->done call
 113                  * to finish up the I/O.
 114                  */
 115                 while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) {
 116                         TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain);
 117                         info = req->r_info;
 118                         KKASSERT(info);
 119                         info->error = nfs_request(info,
 120                                                   NFSM_STATE_PROCESSREPLY,
 121                                                   NFSM_STATE_DONE);
 122                         if (info->error == EINPROGRESS) {
 123                                 kprintf("rxq: move info %p back to txq\n", info);
 124                                 TAILQ_INSERT_TAIL(&nmp->nm_reqtxq, req, r_chain);
 125                                 nfssvc_iod_writer_wakeup(nmp);
 126                         } else {
 127                                 info->done(info);
 128                         }
 129                 }
 130         }
 131         nmp->nm_rxthread = NULL;
 132         nmp->nm_rxstate = NFSSVC_DONE;
 133         wakeup(&nmp->nm_rxthread);
 134 }
 135
 136 /*
 137  * The writer sits on the send side of the client's socket and
 138  * does both the initial processing of BIOs and also transmission
 139  * and retransmission of nfsreq's.
 140  *
 141  * The writer processes both new BIOs from nm_bioq and retransmit
 142  * or state machine jumpbacks from nm_reqtxq
 143  */
 144 void
 145 nfssvc_iod_writer(void *arg)
 146 {
 147         struct nfsmount *nmp = arg;
 148         struct bio *bio;
 149         struct nfsreq *req;
 150         struct vnode *vp;
 151         nfsm_info_t info;
 152
 153         if (nmp->nm_txstate == NFSSVC_INIT)
 154                 nmp->nm_txstate = NFSSVC_PENDING;
 155         for (;;) {
 156                 if (nmp->nm_txstate == NFSSVC_WAITING) {
 157                         tsleep(&nmp->nm_txstate, 0, "nfsidl", 0);
 158                         continue;
 159                 }
 160                 if (nmp->nm_txstate != NFSSVC_PENDING)
 161                         break;
 162                 nmp->nm_txstate = NFSSVC_WAITING;
 163
 164                 while (nmp->nm_bioqlen && nmp->nm_reqqlen < 32) {
 165                         bio = TAILQ_FIRST(&nmp->nm_bioq);
 166                         KKASSERT(bio);
 167                         TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
 168                         nmp->nm_bioqlen--;
 169                         vp = bio->bio_driver_info;
 170                         nfs_startio(vp, bio, NULL);
 171                 }
 172
 173                 /*
 174                  * Process reauths & retransmits.  If we get an EINPROGRESS
 175                  * it means the state transitioned to WAITREPLY or later.
 176                  * Otherwise the request completed (probably with an error
 177                  * since we didn't get to a replied state).
 178                  */
 179                 while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) {
 180                         TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain);
 181                         info = req->r_info;
 182                         KKASSERT(info);
 183                         info->error = nfs_request(info,
 184                                                   NFSM_STATE_AUTH,
 185                                                   NFSM_STATE_WAITREPLY);
 186                         if (info->error == EINPROGRESS) {
 187                                 /*
 188                                 TAILQ_INSERT_TAIL(&nmp->nm_reqrxq, req, r_chain);
 189                                 */
 190                         } else {
 191                                 info->done(info);
 192                         }
 193                 }
 194         }
 195         nmp->nm_txthread = NULL;
 196         nmp->nm_txstate = NFSSVC_DONE;
 197         wakeup(&nmp->nm_txthread);
 198 }
 199
 200 void
 201 nfssvc_iod_stop(struct nfsmount *nmp)
 202 {
 203         nmp->nm_txstate = NFSSVC_STOPPING;
 204         wakeup(&nmp->nm_txstate);
 205         while (nmp->nm_txthread)
 206                 tsleep(&nmp->nm_txthread, 0, "nfssttx", 0);
 207
 208         nmp->nm_rxstate = NFSSVC_STOPPING;
 209         wakeup(&nmp->nm_rxstate);
 210         while (nmp->nm_rxthread)
 211                 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", 0);
 212 }
 213
 214 void
 215 nfssvc_iod_writer_wakeup(struct nfsmount *nmp)
 216 {
 217         if (nmp->nm_txstate == NFSSVC_WAITING) {
 218                 nmp->nm_txstate = NFSSVC_PENDING;
 219                 wakeup(&nmp->nm_txstate);
 220         }
 221 }
 222
 223 void
 224 nfssvc_iod_reader_wakeup(struct nfsmount *nmp)
 225 {
 226         if (nmp->nm_rxstate == NFSSVC_WAITING) {
 227                 nmp->nm_rxstate = NFSSVC_PENDING;
 228                 wakeup(&nmp->nm_rxstate);
 229         }
 230 }