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Annotation of XNU/bsd/kern/mapfs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* 
        !            23:  * Mach Operating System
        !            24:  * Copyright (c) 1987 Carnegie-Mellon University
        !            25:  * All rights reserved.  The CMU software License Agreement specifies
        !            26:  * the terms and conditions for use and redistribution.
        !            27:  */
        !            28: /*
        !            29:  *     File:   mapfs.c
        !            30:  *     Author: Avadis Tevanian, Jr.
        !            31:  *
        !            32:  *     Copyright (C) 1987, Avadis Tevanian, Jr.
        !            33:  *
        !            34:  *     Support for mapped file system implementation.
        !            35:  *
        !            36:  * HISTORY
        !            37:  * 6-Dev-1997 A.Ramesh at Apple
        !            38:  *     Made the chages for MacOSX; Reanamed mfs to mapfs to avoid confusion
        !            39:  *     with memory based filesystem.
        !            40:  *
        !            41:  * 18-Nov-92 Phillip Dibner at NeXT
        !            42:  *     Made the i/o throttle global.   This is a hack on top of a hack and 
        !            43:  *     should be fixed properly, probably in the vm system.
        !            44:  *
        !            45:  *  3-Sep-92 Joe Murdock at NeXT
        !            46:  *     Added an i/o throttle to mfs_io as a cheap work-around for a i/o buffer
        !            47:  *     resource conflict with usr-space system bottle-necks (nfs servers, etc)
        !            48:  *
        !            49:  *  7-Feb-92 Jim Hays
        !            50:  *     There are still bugs in this code dealing with vmp_pushing wired 
        !            51:  *     pages. We need to modify the sound drivers locks to be breakable
        !            52:  *     except during the actual playing. 
        !            53:  *
        !            54:  *  3-Aug-90  Doug Mitchell at NeXT
        !            55:  *     Added primitives for loadable file system support.
        !            56:  *
        !            57:  *  7-Mar-90  Brian Pinkerton (bpinker) at NeXT
        !            58:  *     Changed mfs_trunc to return an indication of change.
        !            59:  *
        !            60:  *  9-Mar-88  John Seamons (jks) at NeXT
        !            61:  *     SUN_VFS: allocate vm_info structures from a zone.
        !            62:  *
        !            63:  * 29-Jan-88  David Golub (dbg) at Carnegie-Mellon University
        !            64:  *     Corrected calls to inode_pager_setup and kmem_alloc.
        !            65:  *
        !            66:  * 15-Sep-87  Michael Young (mwyoung) at Carnegie-Mellon University
        !            67:  *     De-linted.
        !            68:  *
        !            69:  * 18-Jun-87  Michael Young (mwyoung) at Carnegie-Mellon University
        !            70:  *     Make most of this file dependent on MACH_NBC.
        !            71:  *
        !            72:  * 30-Apr-87  Avadis Tevanian (avie) at Carnegie-Mellon University
        !            73:  *     Created.
        !            74:  */
        !            75: 
        !            76: 
        !            77: #include <kern/mapfs.h>
        !            78: #include <sys/param.h>
        !            79: #include <sys/systm.h>
        !            80: #include <sys/mount.h>
        !            81: #include <sys/proc.h>
        !            82: #include <sys/user.h>
        !            83: #include <sys/vnode.h>
        !            84: #include <sys/uio.h>
        !            85: #include <ufs/ufs/quota.h>
        !            86: #include <ufs/ufs/inode.h>
        !            87: #include <sys/dir.h>
        !            88: #include <vm/vm_kern.h>
        !            89: #include <mach/vm_param.h>
        !            90: #include <mach/machine.h>
        !            91: #include <vm/vnode_pager.h>
        !            92: #include <sys/lock.h>
        !            93: 
        !            94: struct zone    *vm_info_zone;
        !            95: 
        !            96: /*
        !            97:  *     Private variables and macros.
        !            98:  */
        !            99: 
        !           100: queue_head_t           vm_info_queue;          /* lru list of structures */
        !           101: decl_simple_lock_data(,        vm_info_lock_data)      /* lock for lru list */
        !           102: int                    vm_info_version = 0;    /* version number */
        !           103: 
        !           104: #define        vm_info_lock()          simple_lock(&vm_info_lock_data)
        !           105: #define        vm_info_unlock()        simple_unlock(&vm_info_lock_data)
        !           106: 
        !           107: 
        !           108: 
        !           109: 
        !           110: /*
        !           111:  *     mapfs_init:
        !           112:  *
        !           113:  *     Initialize the mapped FS module.
        !           114:  */
        !           115: int
        !           116: mapfs_init()
        !           117: {
        !           118:        int                     i;
        !           119: 
        !           120:        queue_init(&vm_info_queue);
        !           121:        simple_lock_init(&vm_info_lock_data);
        !           122: 
        !           123:        i = (vm_size_t) sizeof (struct vm_info);
        !           124:        vm_info_zone = zinit (i, 10000*i, 8192, "vm_info zone");
        !           125:        return(0);
        !           126: }
        !           127: 
        !           128: /*
        !           129:  *     vm_info_init:
        !           130:  *
        !           131:  *     Initialize a vm_info structure for a vnode.
        !           132:  */
        !           133: int
        !           134: vm_info_init(vp)
        !           135:        struct vnode *vp;
        !           136: {
        !           137:        register struct vm_info *vmp;
        !           138: 
        !           139:        vmp = vp->v_vm_info;
        !           140:        if (vmp == VM_INFO_NULL)
        !           141:                vmp = (struct vm_info *) zalloc(vm_info_zone);
        !           142:        vmp->pager = 0;
        !           143:        vmp->map_count = 0;
        !           144:        vmp->use_count = 0;
        !           145:        vmp->va = 0;
        !           146:        vmp->size = 0;
        !           147:        vmp->offset = 0;
        !           148:        vmp->cred = (struct ucred *) NULL;
        !           149:        vmp->error = 0;
        !           150:        vmp->queued = FALSE;
        !           151:        vmp->dirty = FALSE;
        !           152:        vmp->close_flush = TRUE;        /* for safety, reconsider later */
        !           153:        vmp->mapped = FALSE;
        !           154:        vmp->invalidate = FALSE;
        !           155:        vmp->vnode_size = 0;
        !           156: #if FIXME
        !           157:        lock_init(&vmp->lock, TRUE);    /* sleep lock */
        !           158: #endif /* FIXME */
        !           159:        vmp->object = VM_OBJECT_NULL;
        !           160:        vp->v_vm_info = vmp;
        !           161:        return(0);
        !           162: }
        !           163: 
        !           164: /*
        !           165:  * Loadable file system support to avoid exporting struct vm_info.
        !           166:  */
        !           167: void vm_info_free(struct vnode *vp)
        !           168: {
        !           169:        zfree(vm_info_zone, (vm_offset_t)vp->v_vm_info);
        !           170: }
        !           171: 

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