| 1 | /* $Id: vnode_cache.cpp 43363 2012-09-20 09:56:07Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Shared folders - Haiku Guest Additions, vnode cache header.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | /*
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| 19 | * This code is based on:
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| 20 | *
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| 21 | * VirtualBox Guest Additions for Haiku.
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| 22 | * Copyright (c) 2011 Mike Smith <[email protected]>
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| 23 | *
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| 24 | * Permission is hereby granted, free of charge, to any person
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| 25 | * obtaining a copy of this software and associated documentation
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| 26 | * files (the "Software"), to deal in the Software without
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| 27 | * restriction, including without limitation the rights to use,
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| 28 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 29 | * copies of the Software, and to permit persons to whom the
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| 30 | * Software is furnished to do so, subject to the following
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| 31 | * conditions:
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| 32 | *
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| 33 | * The above copyright notice and this permission notice shall be
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| 34 | * included in all copies or substantial portions of the Software.
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| 35 | *
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| 36 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 37 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 38 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 39 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 40 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 41 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 42 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 43 | * OTHER DEALINGS IN THE SOFTWARE.
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| 44 | */
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| 45 |
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| 46 | #include "vboxsf.h"
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| 47 | #include "OpenHashTable.h"
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| 48 |
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| 49 | struct HashTableDefinition {
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| 50 | typedef uint32 KeyType;
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| 51 | typedef vboxsf_vnode ValueType;
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| 52 |
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| 53 | size_t HashKey(uint32 key) const
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| 54 | {
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| 55 | return key;
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| 56 | }
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| 57 |
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| 58 | size_t Hash(vboxsf_vnode* value) const
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| 59 | {
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| 60 | return HashKey(value->vnode);
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| 61 | }
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| 62 |
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| 63 | bool Compare(uint32 key, vboxsf_vnode* value) const
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| 64 | {
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| 65 | return value->vnode == key;
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| 66 | }
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| 67 |
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| 68 | vboxsf_vnode*& GetLink(vboxsf_vnode* value) const
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| 69 | {
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| 70 | return value->next;
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| 71 | }
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| 72 | };
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| 73 |
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| 74 | static BOpenHashTable<HashTableDefinition> g_cache;
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| 75 | static ino_t g_nextVnid = 1;
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| 76 | mutex g_vnodeCacheLock;
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| 77 |
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| 78 | extern "C" status_t vboxsf_new_vnode(PVBSFMAP map, PSHFLSTRING path, PSHFLSTRING name, vboxsf_vnode** p) {
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| 79 | vboxsf_vnode* vn = (vboxsf_vnode*)malloc(sizeof(vboxsf_vnode));
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| 80 | if (vn == NULL) {
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| 81 | return B_NO_MEMORY;
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| 82 | }
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| 83 | dprintf("creating new vnode at %p with path=%p (%s)\n", vn, path->String.utf8, path->String.utf8);
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| 84 | vn->map = map;
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| 85 | vn->path = path;
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| 86 | if (name) {
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| 87 | vn->name = name;
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| 88 | }
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| 89 | else {
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| 90 | const char* cname = strrchr((char*)path->String.utf8, '/');
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| 91 | if (!cname)
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| 92 | vn->name = path; // no slash, assume this *is* the filename
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| 93 | else
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| 94 | vn->name = make_shflstring(cname);
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| 95 | }
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| 96 |
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| 97 | if (mutex_lock(&g_vnodeCacheLock) < B_OK) {
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| 98 | free(vn);
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| 99 | return B_ERROR;
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| 100 | }
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| 101 |
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| 102 | vn->vnode = g_nextVnid++;
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| 103 | *p = vn;
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| 104 | dprintf("vboxsf: allocated %p (path=%p name=%p)\n", vn, vn->path, vn->name);
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| 105 | status_t rv = g_cache.Insert(vn);
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| 106 |
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| 107 | mutex_unlock(&g_vnodeCacheLock);
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| 108 |
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| 109 | return rv;
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| 110 | }
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| 111 |
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| 112 | extern "C" status_t vboxsf_get_vnode(fs_volume* volume, ino_t id, fs_vnode* vnode,
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| 113 | int* _type, uint32* _flags, bool reenter) {
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| 114 | vboxsf_vnode* vn = g_cache.Lookup(id);
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| 115 | if (vn) {
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| 116 | vnode->private_node = vn;
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| 117 | return B_OK;
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| 118 | }
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| 119 | else {
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| 120 | return B_ERROR;
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| 121 | }
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| 122 | }
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| 123 |
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| 124 | extern "C" status_t vboxsf_put_vnode(fs_volume* volume, fs_vnode* vnode, bool reenter) {
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| 125 | g_cache.Remove((vboxsf_vnode*)vnode->private_node);
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| 126 | }
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