/* * Copyright (c) 2009 The DragonFly Project. All rights reserved. * * This code is derived from software contributed to The DragonFly Project * by Matthew Dillon * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name of The DragonFly Project nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific, prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * NFSIOD operations - now built into the kernel. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "rpcv2.h" #include "nfsproto.h" #include "nfs.h" #include "xdr_subs.h" #include "nfsm_subs.h" #include "nfsmount.h" #include "nfsnode.h" #include "nfsrtt.h" /* * nfs service connection reader thread */ void nfssvc_iod_reader(void *arg) { struct nfsmount *nmp = arg; struct nfsm_info *info; struct nfsreq *req; int error; lwkt_gettoken(&nmp->nm_token); if (nmp->nm_rxstate == NFSSVC_INIT) nmp->nm_rxstate = NFSSVC_PENDING; for (;;) { if (nmp->nm_rxstate == NFSSVC_WAITING) { if (TAILQ_FIRST(&nmp->nm_reqq) == NULL && TAILQ_FIRST(&nmp->nm_reqrxq) == NULL) { tsleep(&nmp->nm_rxstate, 0, "nfsidl", 0); } else { /* * This can happen during shutdown, we don't * want to hardloop. */ error = nfs_reply(nmp, NULL); if (error && error != EWOULDBLOCK) { tsleep(&nmp->nm_rxstate, 0, "nfsxxx", hz / 10); } } continue; } if (nmp->nm_rxstate != NFSSVC_PENDING) break; nmp->nm_rxstate = NFSSVC_WAITING; /* * Process requests which have received replies. Only * process the post-reply states. If we get EINPROGRESS * it means the request went back to an auth or retransmit * state and we let the iod_writer thread deal with it. * * Any lock on the request is strictly temporary due to * MP races (XXX). * * If the request completes we run the info->done call * to finish up the I/O. */ while ((req = TAILQ_FIRST(&nmp->nm_reqrxq)) != NULL) { if (req->r_flags & R_LOCKED) { while (req->r_flags & R_LOCKED) { req->r_flags |= R_WANTED; tsleep(req, 0, "nfstrac", 0); } continue; } TAILQ_REMOVE(&nmp->nm_reqrxq, req, r_chain); info = req->r_info; KKASSERT(info); info->error = nfs_request(info, NFSM_STATE_PROCESSREPLY, NFSM_STATE_DONE); if (info->error == EINPROGRESS) { kprintf("rxq: move info %p back to txq\n", info); TAILQ_INSERT_TAIL(&nmp->nm_reqtxq, req, r_chain); nfssvc_iod_writer_wakeup(nmp); } else { atomic_subtract_int(&nmp->nm_bioqlen, 1); info->done(info); } } } nmp->nm_rxthread = NULL; nmp->nm_rxstate = NFSSVC_DONE; lwkt_reltoken(&nmp->nm_token); wakeup(&nmp->nm_rxthread); } /* * nfs service connection writer thread * * The writer sits on the send side of the client's socket and * does both the initial processing of BIOs and also transmission * and retransmission of nfsreq's. * * The writer processes both new BIOs from nm_bioq and retransmit * or state machine jumpbacks from nm_reqtxq */ void nfssvc_iod_writer(void *arg) { struct nfsmount *nmp = arg; struct bio *bio; struct nfsreq *req; struct vnode *vp; nfsm_info_t info; lwkt_gettoken(&nmp->nm_token); if (nmp->nm_txstate == NFSSVC_INIT) nmp->nm_txstate = NFSSVC_PENDING; for (;;) { if (nmp->nm_txstate == NFSSVC_WAITING) { tsleep(&nmp->nm_txstate, 0, "nfsidl", 0); continue; } if (nmp->nm_txstate != NFSSVC_PENDING) break; nmp->nm_txstate = NFSSVC_WAITING; /* * Eep, we could blow out the mbuf allocator if we just * did everything the kernel wanted us to do. */ while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) { if (nmp->nm_reqqlen > nfs_maxasyncbio) break; TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act); vp = bio->bio_driver_info; nfs_startio(vp, bio, NULL); } /* * Process reauths & retransmits. If we get an EINPROGRESS * it means the state transitioned to WAITREPLY or later. * Otherwise the request completed (probably with an error * since we didn't get to a replied state). */ while ((req = TAILQ_FIRST(&nmp->nm_reqtxq)) != NULL) { TAILQ_REMOVE(&nmp->nm_reqtxq, req, r_chain); info = req->r_info; KKASSERT(info); info->error = nfs_request(info, NFSM_STATE_AUTH, NFSM_STATE_WAITREPLY); if (info->error == EINPROGRESS) { ; } else { atomic_subtract_int(&nmp->nm_bioqlen, 1); info->done(info); } } } nmp->nm_txthread = NULL; nmp->nm_txstate = NFSSVC_DONE; lwkt_reltoken(&nmp->nm_token); wakeup(&nmp->nm_txthread); } void nfssvc_iod_stop1(struct nfsmount *nmp) { nmp->nm_txstate = NFSSVC_STOPPING; nmp->nm_rxstate = NFSSVC_STOPPING; } void nfssvc_iod_stop2(struct nfsmount *nmp) { wakeup(&nmp->nm_txstate); while (nmp->nm_txthread) tsleep(&nmp->nm_txthread, 0, "nfssttx", hz*2); wakeup(&nmp->nm_rxstate); while (nmp->nm_rxthread) tsleep(&nmp->nm_rxthread, 0, "nfsstrx", hz*2); } void nfssvc_iod_writer_wakeup(struct nfsmount *nmp) { if (nmp->nm_txstate == NFSSVC_WAITING) { nmp->nm_txstate = NFSSVC_PENDING; wakeup(&nmp->nm_txstate); } } void nfssvc_iod_reader_wakeup(struct nfsmount *nmp) { if (nmp->nm_rxstate == NFSSVC_WAITING) { nmp->nm_rxstate = NFSSVC_PENDING; wakeup(&nmp->nm_rxstate); } }