| vfs_cluster.c (86089) | vfs_cluster.c (91690) |
|---|---|
| 1/*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * Modifications/enhancements: 5 * Copyright (c) 1995 John S. Dyson. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions --- 19 unchanged lines hidden (view full) --- 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)vfs_cluster.c 8.7 (Berkeley) 2/13/94 | 1/*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * Modifications/enhancements: 5 * Copyright (c) 1995 John S. Dyson. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions --- 19 unchanged lines hidden (view full) --- 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)vfs_cluster.c 8.7 (Berkeley) 2/13/94 |
| 36 * $FreeBSD: head/sys/kern/vfs_cluster.c 86089 2001-11-05 18:48:54Z dillon $ | 36 * $FreeBSD: head/sys/kern/vfs_cluster.c 91690 2002-03-05 15:38:49Z eivind $ |
| 37 */ 38 39#include "opt_debug_cluster.h" 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/kernel.h> 44#include <sys/proc.h> --- 7 unchanged lines hidden (view full) --- 52#include <vm/vm.h> 53#include <vm/vm_object.h> 54#include <vm/vm_page.h> 55#include <sys/sysctl.h> 56 57#if defined(CLUSTERDEBUG) 58#include <sys/sysctl.h> 59static int rcluster= 0; | 37 */ 38 39#include "opt_debug_cluster.h" 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/kernel.h> 44#include <sys/proc.h> --- 7 unchanged lines hidden (view full) --- 52#include <vm/vm.h> 53#include <vm/vm_object.h> 54#include <vm/vm_page.h> 55#include <sys/sysctl.h> 56 57#if defined(CLUSTERDEBUG) 58#include <sys/sysctl.h> 59static int rcluster= 0; |
| 60SYSCTL_INT(_debug, OID_AUTO, rcluster, CTLFLAG_RW, &rcluster, 0, ""); | 60SYSCTL_INT(_debug, OID_AUTO, rcluster, CTLFLAG_RW, &rcluster, 0, 61 "Debug VFS clustering code"); |
| 61#endif 62 63static MALLOC_DEFINE(M_SEGMENT, "cluster_save buffer", "cluster_save buffer"); 64 65static struct cluster_save * 66 cluster_collectbufs __P((struct vnode *vp, struct buf *last_bp)); 67static struct buf * 68 cluster_rbuild __P((struct vnode *vp, u_quad_t filesize, daddr_t lbn, 69 daddr_t blkno, long size, int run, struct buf *fbp)); 70 71static int write_behind = 1; | 62#endif 63 64static MALLOC_DEFINE(M_SEGMENT, "cluster_save buffer", "cluster_save buffer"); 65 66static struct cluster_save * 67 cluster_collectbufs __P((struct vnode *vp, struct buf *last_bp)); 68static struct buf * 69 cluster_rbuild __P((struct vnode *vp, u_quad_t filesize, daddr_t lbn, 70 daddr_t blkno, long size, int run, struct buf *fbp)); 71 72static int write_behind = 1; |
| 72SYSCTL_INT(_vfs, OID_AUTO, write_behind, CTLFLAG_RW, &write_behind, 0, ""); | 73SYSCTL_INT(_vfs, OID_AUTO, write_behind, CTLFLAG_RW, &write_behind, 0, 74 "Cluster write-behind; 0: disable, 1: enable, 2: backed off"); |
| 73 | 75 |
| 76/* Page expended to mark partially backed buffers */ |
|
| 74extern vm_page_t bogus_page; 75 | 77extern vm_page_t bogus_page; 78 |
| 79/* 80 * Number of physical bufs (pbufs) this subsystem is allowed. 81 * Manipulated by vm_pager.c 82 */ |
|
| 76extern int cluster_pbuf_freecnt; 77 78/* 79 * Maximum number of blocks for read-ahead. 80 */ 81#define MAXRA 32 82 83/* | 83extern int cluster_pbuf_freecnt; 84 85/* 86 * Maximum number of blocks for read-ahead. 87 */ 88#define MAXRA 32 89 90/* |
| 84 * This replaces bread. | 91 * Read data to a buf, including read-ahead if we find this to be beneficial. 92 * cluster_read replaces bread. |
| 85 */ 86int 87cluster_read(vp, filesize, lblkno, size, cred, totread, seqcount, bpp) 88 struct vnode *vp; 89 u_quad_t filesize; 90 daddr_t lblkno; 91 long size; 92 struct ucred *cred; --- 909 unchanged lines hidden --- | 93 */ 94int 95cluster_read(vp, filesize, lblkno, size, cred, totread, seqcount, bpp) 96 struct vnode *vp; 97 u_quad_t filesize; 98 daddr_t lblkno; 99 long size; 100 struct ucred *cred; --- 909 unchanged lines hidden --- |