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 57 #include <sys/signal2.h> 58 #include <sys/mutex2.h> 59 60 #include <netinet/in.h> 61 #include <netinet/tcp.h> 62 63 #include "rpcv2.h" 64 #include "nfsproto.h" 65 #include "nfs.h" 66 #include "xdr_subs.h" 67 #include "nfsm_subs.h" 68 #include "nfsmount.h" 69 #include "nfsnode.h" 70 #include "nfsrtt.h" 71 72 /* 73 * nfs service connection reader thread 74 */ 75 void 76 nfssvc_iod_reader(void *arg) 77 { 78 struct nfsmount *nmp = arg; 79 struct nfsm_info *info; 80 struct nfsreq *req; 81 int error; 82 83 lwkt_gettoken(&nmp->nm_token); 84 85 if (nmp->nm_rxstate == NFSSVC_INIT) 86 nmp->nm_rxstate = NFSSVC_PENDING; 87 for (;;) { 88 if (nmp->nm_rxstate == NFSSVC_WAITING) { 89 if (TAILQ_FIRST(&nmp->nm_reqq) == NULL && 90 TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) { 91 tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0); 92 } else { 93 /* 94 * This can happen during shutdown, we don't 95 * want to hardloop. 96 */ 97 error = nfs_reply(nmp, NULL); 98 if (error && error != EWOULDBLOCK) { 99 tsleep(&nmp->nm_rxstate, 0, 100 "nfsxxx", hz / 10); 101 } 102 } 103 continue; 104 } 105 if (nmp->nm_rxstate != NFSSVC_PENDING) 106 break; 107 nmp->nm_rxstate = NFSSVC_WAITING; 108 109 /* 110 * Process requests which have received replies. Only 111 * process the post-reply states. If we get EINPROGRESS 112 * it means the request went back to an auth or retransmit 113 * state and we let the iod_writer thread deal with it. 114 * 115 * Any lock on the request is strictly temporary due to 116 * MP races (XXX). 117 * 118 * If the request completes we run the info->done call 119 * to finish up the I/O. 120 */ 121 while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) { 122 if (req->r_flags & R_LOCKED) { 123 while (req->r_flags & R_LOCKED) { 124 req->r_flags |= R_WANTED; 125 tsleep(req, 0, "nfstrac", 0); 126 } 127 continue; 128 } 129 TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain); 130 info = req->r_info; 131 KKASSERT(info); 132 info->error = nfs_request(info, 133 NFSM_STATE_PROCESSREPLY, 134 NFSM_STATE_DONE); 135 if (info->error == EINPROGRESS) { 136 kprintf("rxq: move info %p back to txq\n", info); 137 TAILQ_INSERT_TAIL(&nmp->nm_reqtxq, req, r_chain); 138 nfssvc_iod_writer_wakeup(nmp); 139 } else { 140 atomic_subtract_int(&nmp->nm_bioqlen, 1); 141 info->done(info); 142 } 143 } 144 } 145 nmp->nm_rxthread = NULL; 146 nmp->nm_rxstate = NFSSVC_DONE; 147 148 lwkt_reltoken(&nmp->nm_token); 149 wakeup(&nmp->nm_rxthread); 150 } 151 152 /* 153 * nfs service connection writer thread 154 * 155 * The writer sits on the send side of the client's socket and 156 * does both the initial processing of BIOs and also transmission 157 * and retransmission of nfsreq's. 158 * 159 * The writer processes both new BIOs from nm_bioq and retransmit 160 * or state machine jumpbacks from nm_reqtxq 161 */ 162 void 163 nfssvc_iod_writer(void *arg) 164 { 165 struct nfsmount *nmp = arg; 166 struct bio *bio; 167 struct nfsreq *req; 168 struct vnode *vp; 169 nfsm_info_t info; 170 171 lwkt_gettoken(&nmp->nm_token); 172 173 if (nmp->nm_txstate == NFSSVC_INIT) 174 nmp->nm_txstate = NFSSVC_PENDING; 175 176 for (;;) { 177 if (nmp->nm_txstate == NFSSVC_WAITING) { 178 tsleep(&nmp->nm_txstate, 0, "nfsidl", 0); 179 continue; 180 } 181 if (nmp->nm_txstate != NFSSVC_PENDING) 182 break; 183 nmp->nm_txstate = NFSSVC_WAITING; 184 185 /* 186 * Eep, we could blow out the mbuf allocator if we just 187 * did everything the kernel wanted us to do. 188 */ 189 while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) { 190 if (nmp->nm_reqqlen > nfs_maxasyncbio) 191 break; 192 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act); 193 vp = bio->bio_driver_info; 194 nfs_startio(vp, bio, NULL); 195 } 196 197 /* 198 * Process reauths & retransmits. If we get an EINPROGRESS 199 * it means the state transitioned to WAITREPLY or later. 200 * Otherwise the request completed (probably with an error 201 * since we didn't get to a replied state). 202 */ 203 while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) { 204 TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain); 205 info = req->r_info; 206 KKASSERT(info); 207 info->error = nfs_request(info, 208 NFSM_STATE_AUTH, 209 NFSM_STATE_WAITREPLY); 210 if (info->error == EINPROGRESS) { 211 ; 212 } else { 213 atomic_subtract_int(&nmp->nm_bioqlen, 1); 214 info->done(info); 215 } 216 } 217 } 218 nmp->nm_txthread = NULL; 219 nmp->nm_txstate = NFSSVC_DONE; 220 lwkt_reltoken(&nmp->nm_token); 221 wakeup(&nmp->nm_txthread); 222 } 223 224 void 225 nfssvc_iod_stop1(struct nfsmount *nmp) 226 { 227 nmp->nm_txstate = NFSSVC_STOPPING; 228 nmp->nm_rxstate = NFSSVC_STOPPING; 229 } 230 231 void 232 nfssvc_iod_stop2(struct nfsmount *nmp) 233 { 234 wakeup(&nmp->nm_txstate); 235 while (nmp->nm_txthread) 236 tsleep(&nmp->nm_txthread, 0, "nfssttx", hz*2); 237 wakeup(&nmp->nm_rxstate); 238 while (nmp->nm_rxthread) 239 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", hz*2); 240 } 241 242 void 243 nfssvc_iod_writer_wakeup(struct nfsmount *nmp) 244 { 245 if (nmp->nm_txstate == NFSSVC_WAITING) { 246 nmp->nm_txstate = NFSSVC_PENDING; 247 wakeup(&nmp->nm_txstate); 248 } 249 } 250 251 void 252 nfssvc_iod_reader_wakeup(struct nfsmount *nmp) 253 { 254 if (nmp->nm_rxstate == NFSSVC_WAITING) { 255 nmp->nm_rxstate = NFSSVC_PENDING; 256 wakeup(&nmp->nm_rxstate); 257 } 258 } 259