198 lines
5.6 KiB
C
198 lines
5.6 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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/rpcv2.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, "NFS srvsock", "Nfs server structure");
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static void nfssvc_iod(void *);
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#define TRUE 1
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#define FALSE 0
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static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
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SYSCTL_DECL(_vfs_nfs);
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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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struct proc *p;
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for (i = 0; i < 4; i++) {
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error = kthread_create(nfssvc_iod, NULL, &p, RFHIGHPID,
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"nfsiod %d", i);
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if (error)
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panic("nfsiod_setup: kthread_create error %d", error);
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}
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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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int
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nfsclnt(struct thread *td, struct nfsclnt_args *uap)
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{
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struct lockd_ans la;
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int error;
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if ((uap->flag & NFSCLNT_LOCKDANS) != 0) {
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error = copyin(uap->argp, &la, sizeof(la));
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return (error != 0 ? error : nfslockdans(td->td_proc, &la));
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}
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return EINVAL;
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}
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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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* Never returns unless it fails or gets killed.
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*/
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static void
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nfssvc_iod(void *dummy)
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{
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struct buf *bp;
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int i, myiod;
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struct nfsmount *nmp;
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int error = 0;
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mtx_lock(&Giant);
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/*
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* Assign my position or return error if too many already running
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*/
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myiod = -1;
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for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
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if (nfs_asyncdaemon[i] == 0) {
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nfs_asyncdaemon[i]++;
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myiod = i;
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break;
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}
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if (myiod == -1)
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return /* XXX (EBUSY) */;
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nfs_numasync++;
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/*
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* Just loop around doin our stuff until SIGKILL
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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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&& error == 0) {
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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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error = tsleep((caddr_t)&nfs_iodwant[myiod],
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PWAIT | PCATCH, "nfsidl", 0);
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}
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if (error) {
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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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nfs_numasync--;
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return /* XXX (error) */;
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}
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while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) {
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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 = FALSE;
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wakeup(&nmp->nm_bufq);
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}
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if (bp->b_iocmd == BIO_READ)
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(void) nfs_doio(bp, bp->b_rcred, (struct thread *)0);
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else
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(void) nfs_doio(bp, bp->b_wcred, (struct thread *)0);
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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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}
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