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 crit_enter(); 85 for (;;) { 86 if (nmp->nm_rxstate == NFSSVC_WAITING) { 87 if (TAILQ_FIRST(&nmp->nm_reqq) == NULL && 88 TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) { 89 tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0); 90 } else { 91 /* 92 * This can happen during shutdown, we don't 93 * want to hardloop. 94 */ 95 error = nfs_reply(nmp, NULL); 96 if (error && error != EWOULDBLOCK) { 97 tsleep(&nmp->nm_rxstate, 0, 98 "nfsxxx", hz / 10); 99 } 100 } 101 continue; 102 } 103 if (nmp->nm_rxstate != NFSSVC_PENDING) 104 break; 105 nmp->nm_rxstate = NFSSVC_WAITING; 106 107 /* 108 * Process requests which have received replies. Only 109 * process the post-reply states. If we get EINPROGRESS 110 * it means the request went back to an auth or retransmit 111 * state and we let the iod_writer thread deal with it. 112 * 113 * Any lock on the request is strictly temporary due to 114 * MP races (XXX). 115 * 116 * If the request completes we run the info->done call 117 * to finish up the I/O. 118 */ 119 while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) { 120 if (req->r_flags & R_LOCKED) { 121 while (req->r_flags & R_LOCKED) { 122 req->r_flags |= R_WANTED; 123 tsleep(req, 0, "nfstrac", 0); 124 } 125 continue; 126 } 127 TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain); 128 crit_exit(); 129 info = req->r_info; 130 KKASSERT(info); 131 info->error = nfs_request(info, 132 NFSM_STATE_PROCESSREPLY, 133 NFSM_STATE_DONE); 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); 138 } else { 139 atomic_subtract_int(&nmp->nm_bioqlen, 1); 140 info->done(info); 141 } 142 crit_enter(); 143 } 144 } 145 crit_exit(); 146 nmp->nm_rxthread = NULL; 147 nmp->nm_rxstate = NFSSVC_DONE; 148 wakeup(&nmp->nm_rxthread); 149 } 150 151 /* 152 * The writer sits on the send side of the client's socket and 153 * does both the initial processing of BIOs and also transmission 154 * and retransmission of nfsreq's. 155 * 156 * The writer processes both new BIOs from nm_bioq and retransmit 157 * or state machine jumpbacks from nm_reqtxq 158 */ 159 void 160 nfssvc_iod_writer(void *arg) 161 { 162 struct nfsmount *nmp = arg; 163 struct bio *bio; 164 struct nfsreq *req; 165 struct vnode *vp; 166 nfsm_info_t info; 167 168 if (nmp->nm_txstate == NFSSVC_INIT) 169 nmp->nm_txstate = NFSSVC_PENDING; 170 crit_enter(); 171 for (;;) { 172 if (nmp->nm_txstate == NFSSVC_WAITING) { 173 tsleep(&nmp->nm_txstate, 0, "nfsidl", 0); 174 continue; 175 } 176 if (nmp->nm_txstate != NFSSVC_PENDING) 177 break; 178 nmp->nm_txstate = NFSSVC_WAITING; 179 180 /* 181 * Eep, we could blow out the mbuf allocator if we just 182 * did everything the kernel wanted us to do. 183 */ 184 while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) { 185 if (nmp->nm_reqqlen >= NFS_MAXASYNCBIO) 186 break; 187 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act); 188 vp = bio->bio_driver_info; 189 crit_exit(); 190 nfs_startio(vp, bio, NULL); 191 crit_enter(); 192 } 193 194 /* 195 * Process reauths & retransmits. If we get an EINPROGRESS 196 * it means the state transitioned to WAITREPLY or later. 197 * Otherwise the request completed (probably with an error 198 * since we didn't get to a replied state). 199 */ 200 while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) { 201 TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain); 202 info = req->r_info; 203 KKASSERT(info); 204 crit_exit(); 205 info->error = nfs_request(info, 206 NFSM_STATE_AUTH, 207 NFSM_STATE_WAITREPLY); 208 crit_enter(); 209 if (info->error == EINPROGRESS) { 210 ; 211 } else { 212 atomic_subtract_int(&nmp->nm_bioqlen, 1); 213 info->done(info); 214 } 215 } 216 } 217 crit_exit(); 218 nmp->nm_txthread = NULL; 219 nmp->nm_txstate = NFSSVC_DONE; 220 wakeup(&nmp->nm_txthread); 221 } 222 223 void 224 nfssvc_iod_stop1(struct nfsmount *nmp) 225 { 226 crit_enter(); 227 nmp->nm_txstate = NFSSVC_STOPPING; 228 nmp->nm_rxstate = NFSSVC_STOPPING; 229 crit_exit(); 230 } 231 232 void 233 nfssvc_iod_stop2(struct nfsmount *nmp) 234 { 235 wakeup(&nmp->nm_txstate); 236 while (nmp->nm_txthread) 237 tsleep(&nmp->nm_txthread, 0, "nfssttx", hz*2); 238 wakeup(&nmp->nm_rxstate); 239 while (nmp->nm_rxthread) 240 tsleep(&nmp->nm_rxthread, 0, "nfsstrx", hz*2); 241 } 242 243 void 244 nfssvc_iod_writer_wakeup(struct nfsmount *nmp) 245 { 246 if (nmp->nm_txstate == NFSSVC_WAITING) { 247 nmp->nm_txstate = NFSSVC_PENDING; 248 wakeup(&nmp->nm_txstate); 249 } 250 } 251 252 void 253 nfssvc_iod_reader_wakeup(struct nfsmount *nmp) 254 { 255 if (nmp->nm_rxstate == NFSSVC_WAITING) { 256 nmp->nm_rxstate = NFSSVC_PENDING; 257 wakeup(&nmp->nm_rxstate); 258 } 259 } 260