Subversion Repositories HelenOS

/*
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup fs
 * @{
 */

/**
 * @file vfs.c
 * @brief VFS service for HelenOS.
 */

#include <ipc/ipc.h>
#include <ipc/services.h>
#include <async.h>
#include <errno.h>
#include <stdio.h>
#include <bool.h>
#include <string.h>
#include <as.h>
#include <atomic.h>
#include "vfs.h"

#define NAME "vfs"

static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
    bool keep_on_going = true;

    /*
     * The connection was opened via the IPC_CONNECT_ME_TO call.
     * This call needs to be answered.
     */
    ipc_answer_0(iid, EOK);
    
    /*
     * Here we enter the main connection fibril loop.
     * The logic behind this loop and the protocol is that we'd like to keep
     * each connection open until the client hangs up. When the client hangs
     * up, we will free its VFS state. The act of hanging up the connection
     * by the client is equivalent to client termination because we cannot
     * distinguish one from the other. On the other hand, the client can
     * hang up arbitrarily if it has no open files and reestablish the
     * connection later.
     */
    while (keep_on_going) {
        ipc_call_t call;
        ipc_callid_t callid = async_get_call(&call);
        
        fs_handle_t fs_handle;
        int phone;
        
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_PHONE_HUNGUP:
            keep_on_going = false;
            break;
        case VFS_IN_REGISTER:
            vfs_register(callid, &call);
            keep_on_going = false;
            break;
        case VFS_IN_MOUNT:
            vfs_mount(callid, &call);
            break;
        case VFS_IN_OPEN:
            vfs_open(callid, &call);
            break;
        case VFS_IN_OPEN_NODE:
            vfs_open_node(callid, &call);
            break;
        case VFS_IN_CLOSE:
            vfs_close(callid, &call);
            break;
        case VFS_IN_READ:
            vfs_read(callid, &call);
            break;
        case VFS_IN_WRITE:
            vfs_write(callid, &call);
            break;
        case VFS_IN_SEEK:
            vfs_seek(callid, &call);
            break;
        case VFS_IN_TRUNCATE:
            vfs_truncate(callid, &call);
            break;
        case VFS_IN_MKDIR:
            vfs_mkdir(callid, &call);
            break;
        case VFS_IN_UNLINK:
            vfs_unlink(callid, &call);
            break;
        case VFS_IN_RENAME:
            vfs_rename(callid, &call);
            break;
        case VFS_IN_DEVICE:
            vfs_device(callid, &call);
            break;
        case VFS_IN_SYNC:
            vfs_sync(callid, &call);
            break;
        case VFS_IN_NODE:
            vfs_node(callid, &call);
            break;
        default:
            ipc_answer_0(callid, ENOTSUP);
            break;
        }
    }
    
    /* TODO: cleanup after the client */
}

int main(int argc, char **argv)
{
    printf(NAME ": HelenOS VFS server\n");
    
    /*
     * Initialize VFS node hash table.
     */
    if (!vfs_nodes_init()) {
        printf(NAME ": Failed to initialize VFS node hash table\n");
        return ENOMEM;
    }
    
    /*
     * Allocate and initialize the Path Lookup Buffer.
     */
    plb = as_get_mappable_page(PLB_SIZE);
    if (!plb) {
        printf(NAME ": Cannot allocate a mappable piece of address space\n");
        return ENOMEM;
    }
    
    if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
        AS_AREA_CACHEABLE) != plb) {
        printf(NAME ": Cannot create address space area\n");
        return ENOMEM;
    }
    memset(plb, 0, PLB_SIZE);
    
    /*
     * Set a connection handling function/fibril.
     */
    async_set_client_connection(vfs_connection);

    /*
     * Register at the naming service.
     */
    ipcarg_t phonead;
    ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
    
    /*
     * Start accepting connections.
     */
    printf(NAME ": Accepting connections\n");
    async_manager();
    return 0;
}

/**
 * @}
 */