317 lines
8.5 KiB
C
317 lines
8.5 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/namei.h>
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#include <sys/unistd.h>
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#include <sys/kthread.h>
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#include <sys/fcntl.h>
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#include <sys/lockf.h>
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#include <sys/mutex.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfsproto.h>
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#include <nfsclient/nfs.h>
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#include <nfsclient/nfsm_subs.h>
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#include <nfsclient/nfsmount.h>
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#include <nfsclient/nfsnode.h>
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#include <nfsclient/nfs_lock.h>
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static MALLOC_DEFINE(M_NFSSVC, "nfsclient_srvsock", "Nfs server structure");
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static void nfssvc_iod(void *);
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static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
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SYSCTL_DECL(_vfs_nfs);
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/* Maximum number of seconds a nfsiod kthread will sleep before exiting */
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static unsigned int nfs_iodmaxidle = 120;
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SYSCTL_UINT(_vfs_nfs, OID_AUTO, iodmaxidle, CTLFLAG_RW, &nfs_iodmaxidle, 0,
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"Max number of seconds an nfsiod kthread will sleep before exiting");
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/* Maximum number of nfsiod kthreads */
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unsigned int nfs_iodmax = 20;
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/* Minimum number of nfsiod kthreads to keep as spares */
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static unsigned int nfs_iodmin = 0;
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static int
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sysctl_iodmin(SYSCTL_HANDLER_ARGS)
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{
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int error, i;
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int newmin;
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newmin = nfs_iodmin;
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error = sysctl_handle_int(oidp, &newmin, 0, req);
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if (error || (req->newptr == NULL))
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return (error);
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mtx_lock(&nfs_iod_mtx);
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if (newmin > nfs_iodmax) {
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error = EINVAL;
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goto out;
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}
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nfs_iodmin = newmin;
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if (nfs_numasync >= nfs_iodmin)
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goto out;
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/*
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* If the current number of nfsiod is lower
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* than the new minimum, create some more.
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*/
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for (i = nfs_iodmin - nfs_numasync; i > 0; i--)
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nfs_nfsiodnew();
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out:
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mtx_unlock(&nfs_iod_mtx);
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return (0);
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}
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SYSCTL_PROC(_vfs_nfs, OID_AUTO, iodmin, CTLTYPE_UINT | CTLFLAG_RW, 0,
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sizeof (nfs_iodmin), sysctl_iodmin, "IU",
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"Min number of nfsiod kthreads to keep as spares");
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static int
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sysctl_iodmax(SYSCTL_HANDLER_ARGS)
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{
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int error, i;
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int iod, newmax;
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newmax = nfs_iodmax;
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error = sysctl_handle_int(oidp, &newmax, 0, req);
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if (error || (req->newptr == NULL))
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return (error);
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if (newmax > NFS_MAXASYNCDAEMON)
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return (EINVAL);
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mtx_lock(&nfs_iod_mtx);
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nfs_iodmax = newmax;
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if (nfs_numasync <= nfs_iodmax)
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goto out;
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/*
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* If there are some asleep nfsiods that should
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* exit, wakeup() them so that they check nfs_iodmax
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* and exit. Those who are active will exit as
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* soon as they finish I/O.
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*/
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iod = nfs_numasync - 1;
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for (i = 0; i < nfs_numasync - nfs_iodmax; i++) {
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if (nfs_iodwant[iod])
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wakeup(&nfs_iodwant[iod]);
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iod--;
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}
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out:
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mtx_unlock(&nfs_iod_mtx);
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return (0);
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}
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SYSCTL_PROC(_vfs_nfs, OID_AUTO, iodmax, CTLTYPE_UINT | CTLFLAG_RW, 0,
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sizeof (nfs_iodmax), sysctl_iodmax, "IU",
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"Max number of nfsiod kthreads");
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int
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nfs_nfsiodnew(void)
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{
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int error, i;
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int newiod;
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if (nfs_numasync >= nfs_iodmax)
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return (-1);
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newiod = -1;
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for (i = 0; i < nfs_iodmax; i++)
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if (nfs_asyncdaemon[i] == 0) {
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nfs_asyncdaemon[i]++;
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newiod = i;
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break;
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}
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if (newiod == -1)
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return (-1);
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mtx_unlock(&nfs_iod_mtx);
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error = kproc_create(nfssvc_iod, nfs_asyncdaemon + i, NULL, RFHIGHPID,
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0, "nfsiod %d", newiod);
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mtx_lock(&nfs_iod_mtx);
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if (error)
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return (-1);
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nfs_numasync++;
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return (newiod);
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}
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static void
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nfsiod_setup(void *dummy)
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{
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int i;
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int error;
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TUNABLE_INT_FETCH("vfs.nfs.iodmin", &nfs_iodmin);
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mtx_lock(&nfs_iod_mtx);
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/* Silently limit the start number of nfsiod's */
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if (nfs_iodmin > NFS_MAXASYNCDAEMON)
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nfs_iodmin = NFS_MAXASYNCDAEMON;
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for (i = 0; i < nfs_iodmin; i++) {
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error = nfs_nfsiodnew();
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if (error == -1)
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panic("nfsiod_setup: nfs_nfsiodnew failed");
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}
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mtx_unlock(&nfs_iod_mtx);
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}
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SYSINIT(nfsiod, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, nfsiod_setup, NULL);
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static int nfs_defect = 0;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0,
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"Allow nfsiods to migrate serving different mounts");
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/*
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* Asynchronous I/O daemons for client nfs.
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* They do read-ahead and write-behind operations on the block I/O cache.
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* Returns if we hit the timeout defined by the iodmaxidle sysctl.
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*/
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static void
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nfssvc_iod(void *instance)
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{
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struct buf *bp;
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struct nfsmount *nmp;
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int myiod, timo;
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int error = 0;
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mtx_lock(&nfs_iod_mtx);
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myiod = (int *)instance - nfs_asyncdaemon;
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/*
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* Main loop
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*/
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for (;;) {
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while (((nmp = nfs_iodmount[myiod]) == NULL)
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|| !TAILQ_FIRST(&nmp->nm_bufq)) {
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if (myiod >= nfs_iodmax)
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goto finish;
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if (nmp)
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nmp->nm_bufqiods--;
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nfs_iodwant[myiod] = curthread->td_proc;
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nfs_iodmount[myiod] = NULL;
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/*
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* Always keep at least nfs_iodmin kthreads.
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*/
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timo = (myiod < nfs_iodmin) ? 0 : nfs_iodmaxidle * hz;
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error = msleep(&nfs_iodwant[myiod], &nfs_iod_mtx, PWAIT | PCATCH,
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"-", timo);
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if (error) {
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nmp = nfs_iodmount[myiod];
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/*
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* Rechecking the nm_bufq closes a rare race where the
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* nfsiod is woken up at the exact time the idle timeout
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* fires
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*/
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if (nmp && TAILQ_FIRST(&nmp->nm_bufq))
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error = 0;
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break;
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}
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}
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if (error)
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break;
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while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) {
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int giant_locked = 0;
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/* Take one off the front of the list */
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TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist);
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nmp->nm_bufqlen--;
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if (nmp->nm_bufqwant && nmp->nm_bufqlen <= nfs_numasync) {
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nmp->nm_bufqwant = 0;
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wakeup(&nmp->nm_bufq);
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}
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mtx_unlock(&nfs_iod_mtx);
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if (NFS_ISV4(bp->b_vp)) {
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giant_locked = 1;
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mtx_lock(&Giant);
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}
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if (bp->b_flags & B_DIRECT) {
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KASSERT((bp->b_iocmd == BIO_WRITE), ("nfscvs_iod: BIO_WRITE not set"));
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(void)nfs_doio_directwrite(bp);
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} else {
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if (bp->b_iocmd == BIO_READ)
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(void) nfs_doio(bp->b_vp, bp, bp->b_rcred, NULL);
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else
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(void) nfs_doio(bp->b_vp, bp, bp->b_wcred, NULL);
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}
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if (giant_locked)
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mtx_unlock(&Giant);
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mtx_lock(&nfs_iod_mtx);
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/*
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* If there are more than one iod on this mount, then defect
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* so that the iods can be shared out fairly between the mounts
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*/
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if (nfs_defect && nmp->nm_bufqiods > 1) {
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NFS_DPF(ASYNCIO,
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("nfssvc_iod: iod %d defecting from mount %p\n",
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myiod, nmp));
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nfs_iodmount[myiod] = NULL;
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nmp->nm_bufqiods--;
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break;
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}
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}
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}
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finish:
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nfs_asyncdaemon[myiod] = 0;
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if (nmp)
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nmp->nm_bufqiods--;
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nfs_iodwant[myiod] = NULL;
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nfs_iodmount[myiod] = NULL;
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/* Someone may be waiting for the last nfsiod to terminate. */
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if (--nfs_numasync == 0)
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wakeup(&nfs_numasync);
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mtx_unlock(&nfs_iod_mtx);
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if ((error == 0) || (error == EWOULDBLOCK))
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kproc_exit(0);
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/* Abnormal termination */
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kproc_exit(1);
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}
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