diff options
Diffstat (limited to 'sys/nfsclient/nfs_nfsiod.c')
| -rw-r--r-- | sys/nfsclient/nfs_nfsiod.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/sys/nfsclient/nfs_nfsiod.c b/sys/nfsclient/nfs_nfsiod.c new file mode 100644 index 0000000..c244972 --- /dev/null +++ b/sys/nfsclient/nfs_nfsiod.c @@ -0,0 +1,289 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Rick Macklem at The University of Guelph. + * + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. + * + * @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/sysproto.h> +#include <sys/kernel.h> +#include <sys/sysctl.h> +#include <sys/file.h> +#include <sys/filedesc.h> +#include <sys/vnode.h> +#include <sys/malloc.h> +#include <sys/mount.h> +#include <sys/proc.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/domain.h> +#include <sys/protosw.h> +#include <sys/namei.h> +#include <sys/unistd.h> +#include <sys/kthread.h> +#include <sys/fcntl.h> +#include <sys/lockf.h> +#include <sys/mutex.h> + +#include <netinet/in.h> +#include <netinet/tcp.h> +#include <nfs/xdr_subs.h> +#include <nfs/rpcv2.h> +#include <nfs/nfsproto.h> +#include <nfsclient/nfs.h> +#include <nfsclient/nfsm_subs.h> +#include <nfsclient/nfsmount.h> +#include <nfsclient/nfsnode.h> +#include <nfsclient/nfs_lock.h> + +static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure"); + +static void nfssvc_iod(void *); + +static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON]; + +SYSCTL_DECL(_vfs_nfs); + +/* Maximum number of seconds a nfsiod kthread will sleep before exiting */ +static unsigned int nfs_iodmaxidle = 120; +SYSCTL_UINT(_vfs_nfs, OID_AUTO, iodmaxidle, CTLFLAG_RW, &nfs_iodmaxidle, 0, ""); + +/* Maximum number of nfsiod kthreads */ +static unsigned int nfs_iodmax = 20; + +/* Minimum number of nfsiod kthreads to keep as spares */ +static unsigned int nfs_iodmin = 4; + +static int +sysctl_iodmin(SYSCTL_HANDLER_ARGS) +{ + int error, i; + int newmin; + + newmin = nfs_iodmin; + error = sysctl_handle_int(oidp, &newmin, 0, req); + if (error || (req->newptr == NULL)) + return (error); + if (newmin > nfs_iodmax) + return (EINVAL); + nfs_iodmin = newmin; + if (nfs_numasync >= nfs_iodmin) + return (0); + /* + * If the current number of nfsiod is lower + * than the new minimum, create some more. + */ + for (i = nfs_iodmin - nfs_numasync; i > 0; i--) + nfs_nfsiodnew(); + return (0); +} +SYSCTL_PROC(_vfs_nfs, OID_AUTO, iodmin, CTLTYPE_UINT | CTLFLAG_RW, 0, + sizeof (nfs_iodmin), sysctl_iodmin, "IU", ""); + + +static int +sysctl_iodmax(SYSCTL_HANDLER_ARGS) +{ + int error, i; + int iod, newmax; + + newmax = nfs_iodmax; + error = sysctl_handle_int(oidp, &newmax, 0, req); + if (error || (req->newptr == NULL)) + return (error); + if (newmax > NFS_MAXASYNCDAEMON) + return (EINVAL); + nfs_iodmax = newmax; + if (nfs_numasync <= nfs_iodmax) + return (0); + /* + * If there are some asleep nfsiods that should + * exit, wakeup() them so that they check nfs_iodmax + * and exit. Those who are active will exit as + * soon as they finish I/O. + */ + iod = nfs_numasync - 1; + for (i = 0; i < nfs_numasync - nfs_iodmax; i++) { + if (nfs_iodwant[iod]) + wakeup(&nfs_iodwant[iod]); + iod--; + } + return (0); +} +SYSCTL_PROC(_vfs_nfs, OID_AUTO, iodmax, CTLTYPE_UINT | CTLFLAG_RW, 0, + sizeof (nfs_iodmax), sysctl_iodmax, "IU", ""); + +int +nfs_nfsiodnew(void) +{ + int error, i; + int newiod; + + if (nfs_numasync >= nfs_iodmax) + return (-1); + newiod = -1; + for (i = 0; i < nfs_iodmax; i++) + if (nfs_asyncdaemon[i] == 0) { + nfs_asyncdaemon[i]++; + newiod = i; + break; + } + if (newiod == -1) + return (-1); + error = kthread_create(nfssvc_iod, nfs_asyncdaemon + i, NULL, RFHIGHPID, + 0, "nfsiod %d", newiod); + if (error) + return (-1); + nfs_numasync++; + return (newiod); +} + +static void +nfsiod_setup(void *dummy) +{ + int i; + int error; + + TUNABLE_INT_FETCH("vfs.nfs.iodmin", &nfs_iodmin); + /* Silently limit the start number of nfsiod's */ + if (nfs_iodmin > NFS_MAXASYNCDAEMON) + nfs_iodmin = NFS_MAXASYNCDAEMON; + + for (i = 0; i < nfs_iodmin; i++) { + error = nfs_nfsiodnew(); + if (error == -1) + panic("nfsiod_setup: nfs_nfsiodnew failed"); + } +} +SYSINIT(nfsiod, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, nfsiod_setup, NULL); + +static int nfs_defect = 0; +SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, ""); + +int +nfsclnt(struct thread *td, struct nfsclnt_args *uap) +{ + struct lockd_ans la; + int error; + + if ((uap->flag & NFSCLNT_LOCKDANS) != 0) { + error = copyin(uap->argp, &la, sizeof(la)); + return (error != 0 ? error : nfslockdans(td, &la)); + } + return EINVAL; +} + +/* + * Asynchronous I/O daemons for client nfs. + * They do read-ahead and write-behind operations on the block I/O cache. + * Returns if we hit the timeout defined by the iodmaxidle sysctl. + */ +static void +nfssvc_iod(void *instance) +{ + struct buf *bp; + struct nfsmount *nmp; + int myiod, timo; + int error = 0; + + mtx_lock(&Giant); + myiod = (int *)instance - nfs_asyncdaemon; + /* + * Main loop + */ + for (;;) { + while (((nmp = nfs_iodmount[myiod]) == NULL + || !TAILQ_FIRST(&nmp->nm_bufq)) + && error == 0) { + if (myiod >= nfs_iodmax) + goto finish; + if (nmp) + nmp->nm_bufqiods--; + nfs_iodwant[myiod] = curthread->td_proc; + nfs_iodmount[myiod] = NULL; + /* + * Always keep at least nfs_iodmin kthreads. + */ + timo = (myiod < nfs_iodmin) ? 0 : nfs_iodmaxidle * hz; + error = tsleep(&nfs_iodwant[myiod], PWAIT | PCATCH, + "nfsidl", timo); + } + if (error) + break; + while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) { + /* Take one off the front of the list */ + TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist); + nmp->nm_bufqlen--; + if (nmp->nm_bufqwant && nmp->nm_bufqlen <= nfs_numasync) { + nmp->nm_bufqwant = 0; + wakeup(&nmp->nm_bufq); + } + if (bp->b_iocmd == BIO_READ) + (void) nfs_doio(bp, bp->b_rcred, NULL); + else + (void) nfs_doio(bp, bp->b_wcred, NULL); + /* + * If there are more than one iod on this mount, then defect + * so that the iods can be shared out fairly between the mounts + */ + if (nfs_defect && nmp->nm_bufqiods > 1) { + NFS_DPF(ASYNCIO, + ("nfssvc_iod: iod %d defecting from mount %p\n", + myiod, nmp)); + nfs_iodmount[myiod] = NULL; + nmp->nm_bufqiods--; + break; + } + } + } +finish: + nfs_asyncdaemon[myiod] = 0; + if (nmp) + nmp->nm_bufqiods--; + nfs_iodwant[myiod] = NULL; + nfs_iodmount[myiod] = NULL; + nfs_numasync--; + if ((error == 0) || (error == EWOULDBLOCK)) + kthread_exit(0); + /* Abnormal termination */ + kthread_exit(1); +} |
