haiku/SharedFolders/vnode_cache.cpp

9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync/* $Id$ */
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync/** @file
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * Shared folders - Haiku Guest Additions, vnode cache header.
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync */
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync/*
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * Copyright (C) 2012 Oracle Corporation
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync *
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * available from http://www.virtualbox.org. This file is free software;
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * you can redistribute it and/or modify it under the terms of the GNU
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * General Public License (GPL) as published by the Free Software
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync */
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync/*
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * This code is based on:
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync *
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * VirtualBox Guest Additions for Haiku.
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * Copyright (c) 2011 Mike Smith <mike@scgtrp.net>
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync *
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * Permission is hereby granted, free of charge, to any person
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * obtaining a copy of this software and associated documentation
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * files (the "Software"), to deal in the Software without
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * restriction, including without limitation the rights to use,
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * copy, modify, merge, publish, distribute, sublicense, and/or sell
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * copies of the Software, and to permit persons to whom the
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * Software is furnished to do so, subject to the following
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * conditions:
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync *
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * The above copyright notice and this permission notice shall be
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * included in all copies or substantial portions of the Software.
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync *
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync * OTHER DEALINGS IN THE SOFTWARE.
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync */
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync#include "vboxsf.h"
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync#include "OpenHashTable.h"
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsyncstruct HashTableDefinition
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync{
80cbf7153ffa76c740e7317c4be1239391ab2398vboxsync    typedef uint32       KeyType;
80cbf7153ffa76c740e7317c4be1239391ab2398vboxsync    typedef vboxsf_vnode ValueType;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    size_t HashKey(uint32 key) const
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return key;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    size_t Hash(vboxsf_vnode* value) const
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return HashKey(value->vnode);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    bool Compare(uint32 key, vboxsf_vnode* value) const
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return value->vnode == key;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    vboxsf_vnode*& GetLink(vboxsf_vnode* value) const
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return value->next;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync};
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsyncstatic BOpenHashTable<HashTableDefinition> g_cache;
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsyncstatic ino_t g_nextVnid = 1;
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsyncmutex g_vnodeCacheLock;
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsyncextern "C" status_t vboxsf_new_vnode(PVBSFMAP map, PSHFLSTRING path, PSHFLSTRING name, vboxsf_vnode** p)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync{
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    vboxsf_vnode* vn = (vboxsf_vnode*)malloc(sizeof(vboxsf_vnode));
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    if (vn == NULL)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return B_NO_MEMORY;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    dprintf("creating new vnode at %p with path=%p (%s)\n", vn, path->String.utf8, path->String.utf8);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    vn->map = map;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    vn->path = path;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    if (name)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        vn->name = name;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    else
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        const char* cname = strrchr((char*)path->String.utf8, '/');
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        if (!cname)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync            vn->name = path; // no slash, assume this *is* the filename
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        else
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync            vn->name = make_shflstring(cname);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    if (mutex_lock(&g_vnodeCacheLock) < B_OK)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        free(vn);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return B_ERROR;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    vn->vnode = g_nextVnid++;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    *p = vn;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    dprintf("vboxsf: allocated %p (path=%p name=%p)\n", vn, vn->path, vn->name);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    status_t rv = g_cache.Insert(vn);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    mutex_unlock(&g_vnodeCacheLock);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    return rv;
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync}
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsyncextern "C" status_t vboxsf_get_vnode(fs_volume* volume, ino_t id, fs_vnode* vnode,
80cbf7153ffa76c740e7317c4be1239391ab2398vboxsync                                     int* _type, uint32* _flags, bool reenter)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync{
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    vboxsf_vnode* vn = g_cache.Lookup(id);
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    if (vn)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    {
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        vnode->private_node = vn;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync        return B_OK;
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    }
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    return B_ERROR;
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync}
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsyncextern "C" status_t vboxsf_put_vnode(fs_volume* volume, fs_vnode* vnode, bool reenter)
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync{
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync    g_cache.Remove((vboxsf_vnode*)vnode->private_node);
9fc464631dc4a68fbb5eb6419d61fbe91b6b16bdvboxsync}
8e9d8c088aac57bedb558d3164bb681a582e4474vboxsync