7de3839d0d
cluster instead of just the first buffer. Delay buf_start() calls until snapshots have a copy of old content. PR: kern/93942
998 lines
26 KiB
C
998 lines
26 KiB
C
/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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* Modifications/enhancements:
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* Copyright (c) 1995 John S. Dyson. All rights reserved.
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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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* @(#)vfs_cluster.c 8.7 (Berkeley) 2/13/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_debug_cluster.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.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/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/resourcevar.h>
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#include <sys/vmmeter.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <sys/sysctl.h>
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int softdep_wantrollbacks(struct buf *);
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#if defined(CLUSTERDEBUG)
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static int rcluster= 0;
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SYSCTL_INT(_debug, OID_AUTO, rcluster, CTLFLAG_RW, &rcluster, 0,
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"Debug VFS clustering code");
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#endif
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static MALLOC_DEFINE(M_SEGMENT, "cluster_save_buffer", "cluster_save buffer");
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static struct cluster_save *
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cluster_collectbufs(struct vnode *vp, struct buf *last_bp);
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static struct buf *
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cluster_rbuild(struct vnode *vp, u_quad_t filesize, daddr_t lbn,
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daddr_t blkno, long size, int run, struct buf *fbp);
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static void cluster_callback(struct buf *);
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static int write_behind = 1;
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SYSCTL_INT(_vfs, OID_AUTO, write_behind, CTLFLAG_RW, &write_behind, 0,
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"Cluster write-behind; 0: disable, 1: enable, 2: backed off");
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static int read_max = 8;
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SYSCTL_INT(_vfs, OID_AUTO, read_max, CTLFLAG_RW, &read_max, 0,
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"Cluster read-ahead max block count");
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/* Page expended to mark partially backed buffers */
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extern vm_page_t bogus_page;
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/*
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* Read data to a buf, including read-ahead if we find this to be beneficial.
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* cluster_read replaces bread.
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*/
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int
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cluster_read(vp, filesize, lblkno, size, cred, totread, seqcount, bpp)
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struct vnode *vp;
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u_quad_t filesize;
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daddr_t lblkno;
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long size;
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struct ucred *cred;
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long totread;
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int seqcount;
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struct buf **bpp;
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{
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struct buf *bp, *rbp, *reqbp;
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daddr_t blkno, origblkno;
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int maxra, racluster;
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int error, ncontig;
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int i;
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error = 0;
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/*
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* Try to limit the amount of read-ahead by a few
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* ad-hoc parameters. This needs work!!!
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*/
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racluster = vp->v_mount->mnt_iosize_max / size;
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maxra = seqcount;
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maxra = min(read_max, maxra);
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maxra = min(nbuf/8, maxra);
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if (((u_quad_t)(lblkno + maxra + 1) * size) > filesize)
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maxra = (filesize / size) - lblkno;
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/*
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* get the requested block
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*/
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*bpp = reqbp = bp = getblk(vp, lblkno, size, 0, 0, 0);
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origblkno = lblkno;
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/*
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* if it is in the cache, then check to see if the reads have been
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* sequential. If they have, then try some read-ahead, otherwise
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* back-off on prospective read-aheads.
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*/
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if (bp->b_flags & B_CACHE) {
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if (!seqcount) {
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return 0;
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} else if ((bp->b_flags & B_RAM) == 0) {
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return 0;
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} else {
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bp->b_flags &= ~B_RAM;
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VI_LOCK(vp);
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for (i = 1; i < maxra; i++) {
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/*
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* Stop if the buffer does not exist or it
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* is invalid (about to go away?)
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*/
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rbp = gbincore(&vp->v_bufobj, lblkno+i);
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if (rbp == NULL || (rbp->b_flags & B_INVAL))
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break;
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/*
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* Set another read-ahead mark so we know
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* to check again. (If we can lock the
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* buffer without waiting)
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*/
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if ((((i % racluster) == (racluster - 1)) ||
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(i == (maxra - 1)))
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&& (0 == BUF_LOCK(rbp,
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LK_EXCLUSIVE | LK_NOWAIT, NULL))) {
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rbp->b_flags |= B_RAM;
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BUF_UNLOCK(rbp);
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}
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}
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VI_UNLOCK(vp);
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if (i >= maxra) {
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return 0;
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}
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lblkno += i;
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}
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reqbp = bp = NULL;
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/*
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* If it isn't in the cache, then get a chunk from
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* disk if sequential, otherwise just get the block.
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*/
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} else {
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off_t firstread = bp->b_offset;
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int nblks;
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KASSERT(bp->b_offset != NOOFFSET,
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("cluster_read: no buffer offset"));
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ncontig = 0;
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/*
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* Compute the total number of blocks that we should read
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* synchronously.
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*/
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if (firstread + totread > filesize)
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totread = filesize - firstread;
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nblks = howmany(totread, size);
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if (nblks > racluster)
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nblks = racluster;
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/*
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* Now compute the number of contiguous blocks.
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*/
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if (nblks > 1) {
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error = VOP_BMAP(vp, lblkno, NULL,
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&blkno, &ncontig, NULL);
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/*
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* If this failed to map just do the original block.
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*/
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if (error || blkno == -1)
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ncontig = 0;
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}
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/*
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* If we have contiguous data available do a cluster
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* otherwise just read the requested block.
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*/
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if (ncontig) {
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/* Account for our first block. */
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ncontig = min(ncontig + 1, nblks);
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if (ncontig < nblks)
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nblks = ncontig;
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bp = cluster_rbuild(vp, filesize, lblkno,
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blkno, size, nblks, bp);
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lblkno += (bp->b_bufsize / size);
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} else {
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bp->b_flags |= B_RAM;
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bp->b_iocmd = BIO_READ;
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lblkno += 1;
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}
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}
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/*
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* handle the synchronous read so that it is available ASAP.
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*/
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if (bp) {
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if ((bp->b_flags & B_CLUSTER) == 0) {
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vfs_busy_pages(bp, 0);
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}
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bp->b_flags &= ~B_INVAL;
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bp->b_ioflags &= ~BIO_ERROR;
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if ((bp->b_flags & B_ASYNC) || bp->b_iodone != NULL)
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BUF_KERNPROC(bp);
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bp->b_iooffset = dbtob(bp->b_blkno);
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bstrategy(bp);
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curproc->p_stats->p_ru.ru_inblock++;
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}
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/*
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* If we have been doing sequential I/O, then do some read-ahead.
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*/
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while (lblkno < (origblkno + maxra)) {
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error = VOP_BMAP(vp, lblkno, NULL, &blkno, &ncontig, NULL);
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if (error)
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break;
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if (blkno == -1)
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break;
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/*
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* We could throttle ncontig here by maxra but we might as
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* well read the data if it is contiguous. We're throttled
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* by racluster anyway.
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*/
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if (ncontig) {
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ncontig = min(ncontig + 1, racluster);
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rbp = cluster_rbuild(vp, filesize, lblkno, blkno,
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size, ncontig, NULL);
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lblkno += (rbp->b_bufsize / size);
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if (rbp->b_flags & B_DELWRI) {
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bqrelse(rbp);
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continue;
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}
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} else {
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rbp = getblk(vp, lblkno, size, 0, 0, 0);
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lblkno += 1;
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if (rbp->b_flags & B_DELWRI) {
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bqrelse(rbp);
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continue;
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}
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rbp->b_flags |= B_ASYNC | B_RAM;
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rbp->b_iocmd = BIO_READ;
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rbp->b_blkno = blkno;
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}
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if (rbp->b_flags & B_CACHE) {
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rbp->b_flags &= ~B_ASYNC;
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bqrelse(rbp);
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continue;
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}
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if ((rbp->b_flags & B_CLUSTER) == 0) {
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vfs_busy_pages(rbp, 0);
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}
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rbp->b_flags &= ~B_INVAL;
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rbp->b_ioflags &= ~BIO_ERROR;
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if ((rbp->b_flags & B_ASYNC) || rbp->b_iodone != NULL)
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BUF_KERNPROC(rbp);
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rbp->b_iooffset = dbtob(rbp->b_blkno);
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bstrategy(rbp);
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curproc->p_stats->p_ru.ru_inblock++;
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}
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if (reqbp)
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return (bufwait(reqbp));
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else
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return (error);
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}
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/*
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* If blocks are contiguous on disk, use this to provide clustered
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* read ahead. We will read as many blocks as possible sequentially
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* and then parcel them up into logical blocks in the buffer hash table.
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*/
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static struct buf *
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cluster_rbuild(vp, filesize, lbn, blkno, size, run, fbp)
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struct vnode *vp;
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u_quad_t filesize;
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daddr_t lbn;
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daddr_t blkno;
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long size;
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int run;
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struct buf *fbp;
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{
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struct buf *bp, *tbp;
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daddr_t bn;
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int i, inc, j;
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KASSERT(size == vp->v_mount->mnt_stat.f_iosize,
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("cluster_rbuild: size %ld != filesize %jd\n",
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size, (intmax_t)vp->v_mount->mnt_stat.f_iosize));
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/*
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* avoid a division
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*/
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while ((u_quad_t) size * (lbn + run) > filesize) {
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--run;
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}
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if (fbp) {
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tbp = fbp;
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tbp->b_iocmd = BIO_READ;
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} else {
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tbp = getblk(vp, lbn, size, 0, 0, 0);
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if (tbp->b_flags & B_CACHE)
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return tbp;
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tbp->b_flags |= B_ASYNC | B_RAM;
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tbp->b_iocmd = BIO_READ;
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}
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tbp->b_blkno = blkno;
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if( (tbp->b_flags & B_MALLOC) ||
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((tbp->b_flags & B_VMIO) == 0) || (run <= 1) )
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return tbp;
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bp = trypbuf(&cluster_pbuf_freecnt);
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if (bp == 0)
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return tbp;
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/*
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* We are synthesizing a buffer out of vm_page_t's, but
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* if the block size is not page aligned then the starting
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* address may not be either. Inherit the b_data offset
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* from the original buffer.
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*/
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bp->b_data = (char *)((vm_offset_t)bp->b_data |
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((vm_offset_t)tbp->b_data & PAGE_MASK));
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bp->b_flags = B_ASYNC | B_CLUSTER | B_VMIO;
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bp->b_iocmd = BIO_READ;
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bp->b_iodone = cluster_callback;
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bp->b_blkno = blkno;
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bp->b_lblkno = lbn;
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bp->b_offset = tbp->b_offset;
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KASSERT(bp->b_offset != NOOFFSET, ("cluster_rbuild: no buffer offset"));
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pbgetvp(vp, bp);
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TAILQ_INIT(&bp->b_cluster.cluster_head);
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bp->b_bcount = 0;
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bp->b_bufsize = 0;
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bp->b_npages = 0;
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inc = btodb(size);
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for (bn = blkno, i = 0; i < run; ++i, bn += inc) {
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if (i != 0) {
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if ((bp->b_npages * PAGE_SIZE) +
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round_page(size) > vp->v_mount->mnt_iosize_max) {
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break;
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}
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tbp = getblk(vp, lbn + i, size, 0, 0, GB_LOCK_NOWAIT);
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/* Don't wait around for locked bufs. */
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if (tbp == NULL)
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break;
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/*
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* Stop scanning if the buffer is fully valid
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* (marked B_CACHE), or locked (may be doing a
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* background write), or if the buffer is not
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* VMIO backed. The clustering code can only deal
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* with VMIO-backed buffers.
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*/
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VI_LOCK(vp);
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if ((tbp->b_vflags & BV_BKGRDINPROG) ||
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(tbp->b_flags & B_CACHE) ||
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(tbp->b_flags & B_VMIO) == 0) {
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VI_UNLOCK(vp);
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bqrelse(tbp);
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break;
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}
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VI_UNLOCK(vp);
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/*
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* The buffer must be completely invalid in order to
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* take part in the cluster. If it is partially valid
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* then we stop.
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*/
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VM_OBJECT_LOCK(tbp->b_bufobj->bo_object);
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for (j = 0;j < tbp->b_npages; j++) {
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VM_OBJECT_LOCK_ASSERT(tbp->b_pages[j]->object,
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MA_OWNED);
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if (tbp->b_pages[j]->valid)
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break;
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}
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VM_OBJECT_UNLOCK(tbp->b_bufobj->bo_object);
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if (j != tbp->b_npages) {
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bqrelse(tbp);
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break;
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}
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/*
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* Set a read-ahead mark as appropriate
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*/
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if ((fbp && (i == 1)) || (i == (run - 1)))
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tbp->b_flags |= B_RAM;
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/*
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* Set the buffer up for an async read (XXX should
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* we do this only if we do not wind up brelse()ing?).
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* Set the block number if it isn't set, otherwise
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* if it is make sure it matches the block number we
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* expect.
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*/
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tbp->b_flags |= B_ASYNC;
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tbp->b_iocmd = BIO_READ;
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if (tbp->b_blkno == tbp->b_lblkno) {
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tbp->b_blkno = bn;
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} else if (tbp->b_blkno != bn) {
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brelse(tbp);
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break;
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}
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}
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/*
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* XXX fbp from caller may not be B_ASYNC, but we are going
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* to biodone() it in cluster_callback() anyway
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*/
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BUF_KERNPROC(tbp);
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TAILQ_INSERT_TAIL(&bp->b_cluster.cluster_head,
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tbp, b_cluster.cluster_entry);
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VM_OBJECT_LOCK(tbp->b_bufobj->bo_object);
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for (j = 0; j < tbp->b_npages; j += 1) {
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vm_page_t m;
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m = tbp->b_pages[j];
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vm_page_io_start(m);
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vm_object_pip_add(m->object, 1);
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if ((bp->b_npages == 0) ||
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(bp->b_pages[bp->b_npages-1] != m)) {
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bp->b_pages[bp->b_npages] = m;
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bp->b_npages++;
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}
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if ((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL)
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tbp->b_pages[j] = bogus_page;
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}
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VM_OBJECT_UNLOCK(tbp->b_bufobj->bo_object);
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/*
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* XXX shouldn't this be += size for both, like in
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* cluster_wbuild()?
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*
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* Don't inherit tbp->b_bufsize as it may be larger due to
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* a non-page-aligned size. Instead just aggregate using
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* 'size'.
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*/
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if (tbp->b_bcount != size)
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printf("warning: tbp->b_bcount wrong %ld vs %ld\n", tbp->b_bcount, size);
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if (tbp->b_bufsize != size)
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printf("warning: tbp->b_bufsize wrong %ld vs %ld\n", tbp->b_bufsize, size);
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bp->b_bcount += size;
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bp->b_bufsize += size;
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}
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/*
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* Fully valid pages in the cluster are already good and do not need
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* to be re-read from disk. Replace the page with bogus_page
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*/
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VM_OBJECT_LOCK(bp->b_bufobj->bo_object);
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for (j = 0; j < bp->b_npages; j++) {
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VM_OBJECT_LOCK_ASSERT(bp->b_pages[j]->object, MA_OWNED);
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if ((bp->b_pages[j]->valid & VM_PAGE_BITS_ALL) ==
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VM_PAGE_BITS_ALL) {
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bp->b_pages[j] = bogus_page;
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}
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}
|
|
VM_OBJECT_UNLOCK(bp->b_bufobj->bo_object);
|
|
if (bp->b_bufsize > bp->b_kvasize)
|
|
panic("cluster_rbuild: b_bufsize(%ld) > b_kvasize(%d)\n",
|
|
bp->b_bufsize, bp->b_kvasize);
|
|
bp->b_kvasize = bp->b_bufsize;
|
|
|
|
pmap_qenter(trunc_page((vm_offset_t) bp->b_data),
|
|
(vm_page_t *)bp->b_pages, bp->b_npages);
|
|
return (bp);
|
|
}
|
|
|
|
/*
|
|
* Cleanup after a clustered read or write.
|
|
* This is complicated by the fact that any of the buffers might have
|
|
* extra memory (if there were no empty buffer headers at allocbuf time)
|
|
* that we will need to shift around.
|
|
*/
|
|
static void
|
|
cluster_callback(bp)
|
|
struct buf *bp;
|
|
{
|
|
struct buf *nbp, *tbp;
|
|
int error = 0;
|
|
|
|
/*
|
|
* Must propogate errors to all the components.
|
|
*/
|
|
if (bp->b_ioflags & BIO_ERROR)
|
|
error = bp->b_error;
|
|
|
|
pmap_qremove(trunc_page((vm_offset_t) bp->b_data), bp->b_npages);
|
|
/*
|
|
* Move memory from the large cluster buffer into the component
|
|
* buffers and mark IO as done on these.
|
|
*/
|
|
for (tbp = TAILQ_FIRST(&bp->b_cluster.cluster_head);
|
|
tbp; tbp = nbp) {
|
|
nbp = TAILQ_NEXT(&tbp->b_cluster, cluster_entry);
|
|
if (error) {
|
|
tbp->b_ioflags |= BIO_ERROR;
|
|
tbp->b_error = error;
|
|
} else {
|
|
tbp->b_dirtyoff = tbp->b_dirtyend = 0;
|
|
tbp->b_flags &= ~B_INVAL;
|
|
tbp->b_ioflags &= ~BIO_ERROR;
|
|
/*
|
|
* XXX the bdwrite()/bqrelse() issued during
|
|
* cluster building clears B_RELBUF (see bqrelse()
|
|
* comment). If direct I/O was specified, we have
|
|
* to restore it here to allow the buffer and VM
|
|
* to be freed.
|
|
*/
|
|
if (tbp->b_flags & B_DIRECT)
|
|
tbp->b_flags |= B_RELBUF;
|
|
}
|
|
bufdone(tbp);
|
|
}
|
|
pbrelvp(bp);
|
|
relpbuf(bp, &cluster_pbuf_freecnt);
|
|
}
|
|
|
|
/*
|
|
* cluster_wbuild_wb:
|
|
*
|
|
* Implement modified write build for cluster.
|
|
*
|
|
* write_behind = 0 write behind disabled
|
|
* write_behind = 1 write behind normal (default)
|
|
* write_behind = 2 write behind backed-off
|
|
*/
|
|
|
|
static __inline int
|
|
cluster_wbuild_wb(struct vnode *vp, long size, daddr_t start_lbn, int len)
|
|
{
|
|
int r = 0;
|
|
|
|
switch(write_behind) {
|
|
case 2:
|
|
if (start_lbn < len)
|
|
break;
|
|
start_lbn -= len;
|
|
/* FALLTHROUGH */
|
|
case 1:
|
|
r = cluster_wbuild(vp, size, start_lbn, len);
|
|
/* FALLTHROUGH */
|
|
default:
|
|
/* FALLTHROUGH */
|
|
break;
|
|
}
|
|
return(r);
|
|
}
|
|
|
|
/*
|
|
* Do clustered write for FFS.
|
|
*
|
|
* Three cases:
|
|
* 1. Write is not sequential (write asynchronously)
|
|
* Write is sequential:
|
|
* 2. beginning of cluster - begin cluster
|
|
* 3. middle of a cluster - add to cluster
|
|
* 4. end of a cluster - asynchronously write cluster
|
|
*/
|
|
void
|
|
cluster_write(struct vnode *vp, struct buf *bp, u_quad_t filesize, int seqcount)
|
|
{
|
|
daddr_t lbn;
|
|
int maxclen, cursize;
|
|
int lblocksize;
|
|
int async;
|
|
|
|
if (vp->v_type == VREG) {
|
|
async = vp->v_mount->mnt_flag & MNT_ASYNC;
|
|
lblocksize = vp->v_mount->mnt_stat.f_iosize;
|
|
} else {
|
|
async = 0;
|
|
lblocksize = bp->b_bufsize;
|
|
}
|
|
lbn = bp->b_lblkno;
|
|
KASSERT(bp->b_offset != NOOFFSET, ("cluster_write: no buffer offset"));
|
|
|
|
/* Initialize vnode to beginning of file. */
|
|
if (lbn == 0)
|
|
vp->v_lasta = vp->v_clen = vp->v_cstart = vp->v_lastw = 0;
|
|
|
|
if (vp->v_clen == 0 || lbn != vp->v_lastw + 1 ||
|
|
(bp->b_blkno != vp->v_lasta + btodb(lblocksize))) {
|
|
maxclen = vp->v_mount->mnt_iosize_max / lblocksize - 1;
|
|
if (vp->v_clen != 0) {
|
|
/*
|
|
* Next block is not sequential.
|
|
*
|
|
* If we are not writing at end of file, the process
|
|
* seeked to another point in the file since its last
|
|
* write, or we have reached our maximum cluster size,
|
|
* then push the previous cluster. Otherwise try
|
|
* reallocating to make it sequential.
|
|
*
|
|
* Change to algorithm: only push previous cluster if
|
|
* it was sequential from the point of view of the
|
|
* seqcount heuristic, otherwise leave the buffer
|
|
* intact so we can potentially optimize the I/O
|
|
* later on in the buf_daemon or update daemon
|
|
* flush.
|
|
*/
|
|
cursize = vp->v_lastw - vp->v_cstart + 1;
|
|
if (((u_quad_t) bp->b_offset + lblocksize) != filesize ||
|
|
lbn != vp->v_lastw + 1 || vp->v_clen <= cursize) {
|
|
if (!async && seqcount > 0) {
|
|
cluster_wbuild_wb(vp, lblocksize,
|
|
vp->v_cstart, cursize);
|
|
}
|
|
} else {
|
|
struct buf **bpp, **endbp;
|
|
struct cluster_save *buflist;
|
|
|
|
buflist = cluster_collectbufs(vp, bp);
|
|
endbp = &buflist->bs_children
|
|
[buflist->bs_nchildren - 1];
|
|
if (VOP_REALLOCBLKS(vp, buflist)) {
|
|
/*
|
|
* Failed, push the previous cluster
|
|
* if *really* writing sequentially
|
|
* in the logical file (seqcount > 1),
|
|
* otherwise delay it in the hopes that
|
|
* the low level disk driver can
|
|
* optimize the write ordering.
|
|
*/
|
|
for (bpp = buflist->bs_children;
|
|
bpp < endbp; bpp++)
|
|
brelse(*bpp);
|
|
free(buflist, M_SEGMENT);
|
|
if (seqcount > 1) {
|
|
cluster_wbuild_wb(vp,
|
|
lblocksize, vp->v_cstart,
|
|
cursize);
|
|
}
|
|
} else {
|
|
/*
|
|
* Succeeded, keep building cluster.
|
|
*/
|
|
for (bpp = buflist->bs_children;
|
|
bpp <= endbp; bpp++)
|
|
bdwrite(*bpp);
|
|
free(buflist, M_SEGMENT);
|
|
vp->v_lastw = lbn;
|
|
vp->v_lasta = bp->b_blkno;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
* Consider beginning a cluster. If at end of file, make
|
|
* cluster as large as possible, otherwise find size of
|
|
* existing cluster.
|
|
*/
|
|
if ((vp->v_type == VREG) &&
|
|
((u_quad_t) bp->b_offset + lblocksize) != filesize &&
|
|
(bp->b_blkno == bp->b_lblkno) &&
|
|
(VOP_BMAP(vp, lbn, NULL, &bp->b_blkno, &maxclen, NULL) ||
|
|
bp->b_blkno == -1)) {
|
|
bawrite(bp);
|
|
vp->v_clen = 0;
|
|
vp->v_lasta = bp->b_blkno;
|
|
vp->v_cstart = lbn + 1;
|
|
vp->v_lastw = lbn;
|
|
return;
|
|
}
|
|
vp->v_clen = maxclen;
|
|
if (!async && maxclen == 0) { /* I/O not contiguous */
|
|
vp->v_cstart = lbn + 1;
|
|
bawrite(bp);
|
|
} else { /* Wait for rest of cluster */
|
|
vp->v_cstart = lbn;
|
|
bdwrite(bp);
|
|
}
|
|
} else if (lbn == vp->v_cstart + vp->v_clen) {
|
|
/*
|
|
* At end of cluster, write it out if seqcount tells us we
|
|
* are operating sequentially, otherwise let the buf or
|
|
* update daemon handle it.
|
|
*/
|
|
bdwrite(bp);
|
|
if (seqcount > 1)
|
|
cluster_wbuild_wb(vp, lblocksize, vp->v_cstart, vp->v_clen + 1);
|
|
vp->v_clen = 0;
|
|
vp->v_cstart = lbn + 1;
|
|
} else if (vm_page_count_severe()) {
|
|
/*
|
|
* We are low on memory, get it going NOW
|
|
*/
|
|
bawrite(bp);
|
|
} else {
|
|
/*
|
|
* In the middle of a cluster, so just delay the I/O for now.
|
|
*/
|
|
bdwrite(bp);
|
|
}
|
|
vp->v_lastw = lbn;
|
|
vp->v_lasta = bp->b_blkno;
|
|
}
|
|
|
|
|
|
/*
|
|
* This is an awful lot like cluster_rbuild...wish they could be combined.
|
|
* The last lbn argument is the current block on which I/O is being
|
|
* performed. Check to see that it doesn't fall in the middle of
|
|
* the current block (if last_bp == NULL).
|
|
*/
|
|
int
|
|
cluster_wbuild(vp, size, start_lbn, len)
|
|
struct vnode *vp;
|
|
long size;
|
|
daddr_t start_lbn;
|
|
int len;
|
|
{
|
|
struct buf *bp, *tbp;
|
|
int i, j;
|
|
int totalwritten = 0;
|
|
int dbsize = btodb(size);
|
|
|
|
while (len > 0) {
|
|
/*
|
|
* If the buffer is not delayed-write (i.e. dirty), or it
|
|
* is delayed-write but either locked or inval, it cannot
|
|
* partake in the clustered write.
|
|
*/
|
|
VI_LOCK(vp);
|
|
if ((tbp = gbincore(&vp->v_bufobj, start_lbn)) == NULL ||
|
|
(tbp->b_vflags & BV_BKGRDINPROG)) {
|
|
VI_UNLOCK(vp);
|
|
++start_lbn;
|
|
--len;
|
|
continue;
|
|
}
|
|
if (BUF_LOCK(tbp,
|
|
LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, VI_MTX(vp))) {
|
|
++start_lbn;
|
|
--len;
|
|
continue;
|
|
}
|
|
if ((tbp->b_flags & (B_INVAL | B_DELWRI)) != B_DELWRI) {
|
|
BUF_UNLOCK(tbp);
|
|
++start_lbn;
|
|
--len;
|
|
continue;
|
|
}
|
|
if (tbp->b_pin_count > 0) {
|
|
BUF_UNLOCK(tbp);
|
|
++start_lbn;
|
|
--len;
|
|
continue;
|
|
}
|
|
bremfree(tbp);
|
|
tbp->b_flags &= ~B_DONE;
|
|
|
|
/*
|
|
* Extra memory in the buffer, punt on this buffer.
|
|
* XXX we could handle this in most cases, but we would
|
|
* have to push the extra memory down to after our max
|
|
* possible cluster size and then potentially pull it back
|
|
* up if the cluster was terminated prematurely--too much
|
|
* hassle.
|
|
*/
|
|
if (((tbp->b_flags & (B_CLUSTEROK | B_MALLOC | B_VMIO)) !=
|
|
(B_CLUSTEROK | B_VMIO)) ||
|
|
(tbp->b_bcount != tbp->b_bufsize) ||
|
|
(tbp->b_bcount != size) ||
|
|
(len == 1) ||
|
|
((bp = getpbuf(&cluster_pbuf_freecnt)) == NULL)) {
|
|
totalwritten += tbp->b_bufsize;
|
|
bawrite(tbp);
|
|
++start_lbn;
|
|
--len;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We got a pbuf to make the cluster in.
|
|
* so initialise it.
|
|
*/
|
|
TAILQ_INIT(&bp->b_cluster.cluster_head);
|
|
bp->b_bcount = 0;
|
|
bp->b_bufsize = 0;
|
|
bp->b_npages = 0;
|
|
if (tbp->b_wcred != NOCRED)
|
|
bp->b_wcred = crhold(tbp->b_wcred);
|
|
|
|
bp->b_blkno = tbp->b_blkno;
|
|
bp->b_lblkno = tbp->b_lblkno;
|
|
bp->b_offset = tbp->b_offset;
|
|
|
|
/*
|
|
* We are synthesizing a buffer out of vm_page_t's, but
|
|
* if the block size is not page aligned then the starting
|
|
* address may not be either. Inherit the b_data offset
|
|
* from the original buffer.
|
|
*/
|
|
bp->b_data = (char *)((vm_offset_t)bp->b_data |
|
|
((vm_offset_t)tbp->b_data & PAGE_MASK));
|
|
bp->b_flags |= B_CLUSTER |
|
|
(tbp->b_flags & (B_VMIO | B_NEEDCOMMIT));
|
|
bp->b_iodone = cluster_callback;
|
|
pbgetvp(vp, bp);
|
|
/*
|
|
* From this location in the file, scan forward to see
|
|
* if there are buffers with adjacent data that need to
|
|
* be written as well.
|
|
*/
|
|
for (i = 0; i < len; ++i, ++start_lbn) {
|
|
if (i != 0) { /* If not the first buffer */
|
|
/*
|
|
* If the adjacent data is not even in core it
|
|
* can't need to be written.
|
|
*/
|
|
VI_LOCK(vp);
|
|
if ((tbp = gbincore(&vp->v_bufobj, start_lbn)) == NULL ||
|
|
(tbp->b_vflags & BV_BKGRDINPROG)) {
|
|
VI_UNLOCK(vp);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If it IS in core, but has different
|
|
* characteristics, or is locked (which
|
|
* means it could be undergoing a background
|
|
* I/O or be in a weird state), then don't
|
|
* cluster with it.
|
|
*/
|
|
if (BUF_LOCK(tbp,
|
|
LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK,
|
|
VI_MTX(vp)))
|
|
break;
|
|
|
|
if ((tbp->b_flags & (B_VMIO | B_CLUSTEROK |
|
|
B_INVAL | B_DELWRI | B_NEEDCOMMIT))
|
|
!= (B_DELWRI | B_CLUSTEROK |
|
|
(bp->b_flags & (B_VMIO | B_NEEDCOMMIT))) ||
|
|
tbp->b_wcred != bp->b_wcred) {
|
|
BUF_UNLOCK(tbp);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Check that the combined cluster
|
|
* would make sense with regard to pages
|
|
* and would not be too large
|
|
*/
|
|
if ((tbp->b_bcount != size) ||
|
|
((bp->b_blkno + (dbsize * i)) !=
|
|
tbp->b_blkno) ||
|
|
((tbp->b_npages + bp->b_npages) >
|
|
(vp->v_mount->mnt_iosize_max / PAGE_SIZE))) {
|
|
BUF_UNLOCK(tbp);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Do not pull in pinned buffers.
|
|
*/
|
|
if (tbp->b_pin_count > 0) {
|
|
BUF_UNLOCK(tbp);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Ok, it's passed all the tests,
|
|
* so remove it from the free list
|
|
* and mark it busy. We will use it.
|
|
*/
|
|
bremfree(tbp);
|
|
tbp->b_flags &= ~B_DONE;
|
|
} /* end of code for non-first buffers only */
|
|
/*
|
|
* If the IO is via the VM then we do some
|
|
* special VM hackery (yuck). Since the buffer's
|
|
* block size may not be page-aligned it is possible
|
|
* for a page to be shared between two buffers. We
|
|
* have to get rid of the duplication when building
|
|
* the cluster.
|
|
*/
|
|
if (tbp->b_flags & B_VMIO) {
|
|
vm_page_t m;
|
|
|
|
VM_OBJECT_LOCK(tbp->b_bufobj->bo_object);
|
|
if (i != 0) { /* if not first buffer */
|
|
for (j = 0; j < tbp->b_npages; j += 1) {
|
|
m = tbp->b_pages[j];
|
|
if (m->flags & PG_BUSY) {
|
|
VM_OBJECT_UNLOCK(
|
|
tbp->b_object);
|
|
bqrelse(tbp);
|
|
goto finishcluster;
|
|
}
|
|
}
|
|
}
|
|
for (j = 0; j < tbp->b_npages; j += 1) {
|
|
m = tbp->b_pages[j];
|
|
vm_page_io_start(m);
|
|
vm_object_pip_add(m->object, 1);
|
|
if ((bp->b_npages == 0) ||
|
|
(bp->b_pages[bp->b_npages - 1] != m)) {
|
|
bp->b_pages[bp->b_npages] = m;
|
|
bp->b_npages++;
|
|
}
|
|
}
|
|
VM_OBJECT_UNLOCK(tbp->b_bufobj->bo_object);
|
|
}
|
|
bp->b_bcount += size;
|
|
bp->b_bufsize += size;
|
|
bundirty(tbp);
|
|
tbp->b_flags &= ~B_DONE;
|
|
tbp->b_ioflags &= ~BIO_ERROR;
|
|
tbp->b_flags |= B_ASYNC;
|
|
tbp->b_iocmd = BIO_WRITE;
|
|
reassignbuf(tbp); /* put on clean list */
|
|
bufobj_wref(tbp->b_bufobj);
|
|
BUF_KERNPROC(tbp);
|
|
TAILQ_INSERT_TAIL(&bp->b_cluster.cluster_head,
|
|
tbp, b_cluster.cluster_entry);
|
|
}
|
|
finishcluster:
|
|
pmap_qenter(trunc_page((vm_offset_t) bp->b_data),
|
|
(vm_page_t *) bp->b_pages, bp->b_npages);
|
|
if (bp->b_bufsize > bp->b_kvasize)
|
|
panic(
|
|
"cluster_wbuild: b_bufsize(%ld) > b_kvasize(%d)\n",
|
|
bp->b_bufsize, bp->b_kvasize);
|
|
bp->b_kvasize = bp->b_bufsize;
|
|
totalwritten += bp->b_bufsize;
|
|
bp->b_dirtyoff = 0;
|
|
bp->b_dirtyend = bp->b_bufsize;
|
|
bawrite(bp);
|
|
|
|
len -= i;
|
|
}
|
|
return totalwritten;
|
|
}
|
|
|
|
/*
|
|
* Collect together all the buffers in a cluster.
|
|
* Plus add one additional buffer.
|
|
*/
|
|
static struct cluster_save *
|
|
cluster_collectbufs(vp, last_bp)
|
|
struct vnode *vp;
|
|
struct buf *last_bp;
|
|
{
|
|
struct cluster_save *buflist;
|
|
struct buf *bp;
|
|
daddr_t lbn;
|
|
int i, len;
|
|
|
|
len = vp->v_lastw - vp->v_cstart + 1;
|
|
buflist = malloc(sizeof(struct buf *) * (len + 1) + sizeof(*buflist),
|
|
M_SEGMENT, M_WAITOK);
|
|
buflist->bs_nchildren = 0;
|
|
buflist->bs_children = (struct buf **) (buflist + 1);
|
|
for (lbn = vp->v_cstart, i = 0; i < len; lbn++, i++) {
|
|
(void) bread(vp, lbn, last_bp->b_bcount, NOCRED, &bp);
|
|
buflist->bs_children[i] = bp;
|
|
if (bp->b_blkno == bp->b_lblkno)
|
|
VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
|
|
NULL, NULL);
|
|
}
|
|
buflist->bs_children[i] = bp = last_bp;
|
|
if (bp->b_blkno == bp->b_lblkno)
|
|
VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL, NULL);
|
|
buflist->bs_nchildren = i + 1;
|
|
return (buflist);
|
|
}
|