1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * University Copyright- Copyright (c) 1982, 1986, 1988 31 * The Regents of the University of California 32 * All Rights Reserved 33 * 34 * University Acknowledgment- Portions of this document are derived from 35 * software developed by the University of California, Berkeley, and its 36 * contributors. 37 */ 38 39 #ifndef _VM_PVN_H 40 #define _VM_PVN_H 41 42 #include <sys/buf.h> 43 #include <vm/seg.h> 44 45 #ifdef __cplusplus 46 extern "C" { 47 #endif 48 49 #ifdef _KERNEL 50 51 /* 52 * VM - paged vnode. 53 * 54 * The VM system manages memory as a cache of paged vnodes. 55 * This file desribes the interfaces to common subroutines 56 * used to help implement the VM/file system routines. 57 */ 58 59 struct page *pvn_read_kluster(struct vnode *vp, u_offset_t off, 60 struct seg *seg, caddr_t addr, u_offset_t *offp, 61 size_t *lenp, u_offset_t vp_off, size_t vp_len, 62 int isra); 63 struct page *pvn_write_kluster(struct vnode *vp, struct page *pp, 64 u_offset_t *offp, size_t *lenp, u_offset_t vp_off, 65 size_t vp_len, int flags); 66 void pvn_read_done(struct page *plist, int flags); 67 void pvn_write_done(struct page *plist, int flags); 68 void pvn_io_done(struct page *plist); 69 int pvn_vplist_dirty(struct vnode *vp, u_offset_t off, 70 int (*putapage)(vnode_t *, struct page *, u_offset_t *, 71 size_t *, int, cred_t *), 72 int flags, struct cred *cred); 73 void pvn_vplist_setdirty(vnode_t *vp, int (*page_check)(page_t *)); 74 int pvn_getdirty(struct page *pp, int flags); 75 void pvn_vpzero(struct vnode *vp, u_offset_t vplen, size_t zbytes); 76 int pvn_getpages( 77 int (*getpage)(vnode_t *, u_offset_t, size_t, uint_t *, 78 struct page *[], size_t, struct seg *, 79 caddr_t, enum seg_rw, cred_t *), 80 struct vnode *vp, u_offset_t off, size_t len, 81 uint_t *protp, struct page **pl, size_t plsz, 82 struct seg *seg, caddr_t addr, enum seg_rw rw, 83 struct cred *cred); 84 void pvn_plist_init(struct page *pp, struct page **pl, size_t plsz, 85 u_offset_t off, size_t io_len, enum seg_rw rw); 86 void pvn_init(void); 87 88 /* 89 * The value is put in p_hash to identify marker pages. It is safe to 90 * test p_hash ==(!=) PVN_VPLIST_HASH_TAG even without holding p_selock. 91 */ 92 #define PVN_VPLIST_HASH_TAG ((page_t *)-1) 93 94 /* 95 * When requesting pages from the getpage routines, pvn_getpages will 96 * allocate space to return PVN_GETPAGE_NUM pages which map PVN_GETPAGE_SZ 97 * worth of bytes. These numbers are chosen to be the minimum of the max's 98 * given in terms of bytes and pages. 99 */ 100 #define PVN_MAX_GETPAGE_SZ 0x10000 /* getpage size limit */ 101 #define PVN_MAX_GETPAGE_NUM 0x8 /* getpage page limit */ 102 103 #if PVN_MAX_GETPAGE_SZ > PVN_MAX_GETPAGE_NUM * PAGESIZE 104 105 #define PVN_GETPAGE_SZ ptob(PVN_MAX_GETPAGE_NUM) 106 #define PVN_GETPAGE_NUM PVN_MAX_GETPAGE_NUM 107 108 #else 109 110 #define PVN_GETPAGE_SZ PVN_MAX_GETPAGE_SZ 111 #define PVN_GETPAGE_NUM btop(PVN_MAX_GETPAGE_SZ) 112 113 #endif 114 115 #endif /* _KERNEL */ 116 117 #ifdef __cplusplus 118 } 119 #endif 120 121 #endif /* _VM_PVN_H */ 122