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2518 jermar 1
/*
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup fs
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 * @{
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 */
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/**
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 * @file vfs.c
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 * @brief VFS service for HelenOS.
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 */
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include <async.h>
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#include <errno.h>
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#include <stdio.h>
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#include <bool.h>
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#include <string.h>
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#include <as.h>
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#include <libadt/list.h>
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#include <atomic.h>
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#include "vfs.h"
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#define NAME "vfs"
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static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
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{
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    bool keep_on_going = true;
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    /*
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     * The connection was opened via the IPC_CONNECT_ME_TO call.
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     * This call needs to be answered.
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     */
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    ipc_answer_0(iid, EOK);
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    /*
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     * Here we enter the main connection fibril loop.
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     * The logic behind this loop and the protocol is that we'd like to keep
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     * each connection open until the client hangs up. When the client hangs
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     * up, we will free its VFS state. The act of hanging up the connection
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     * by the client is equivalent to client termination because we cannot
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     * distinguish one from the other. On the other hand, the client can
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     * hang up arbitrarily if it has no open files and reestablish the
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     * connection later.
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     */
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    while (keep_on_going) {
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        ipc_call_t call;
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        ipc_callid_t callid = async_get_call(&call);
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        fs_handle_t fs_handle;
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        int phone;
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        switch (IPC_GET_METHOD(call)) {
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        case IPC_M_PHONE_HUNGUP:
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            keep_on_going = false;
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            break;
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        case IPC_M_CONNECT_ME_TO:
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            /*
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             * Connect the client file system to another one.
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             */
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            /* FIXME:
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             * Prevent ordinary clients from connecting to file
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             * system servers directly. This should be solved by
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             * applying some security mechanisms.
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             */
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            fs_handle = IPC_GET_ARG1(call);
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            phone = vfs_grab_phone(fs_handle);
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            (void) ipc_forward_fast(callid, phone, 0, 0, 0,
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                IPC_FF_NONE);
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            vfs_release_phone(phone);
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            break;
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        case VFS_REGISTER:
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            vfs_register(callid, &call);
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            /*
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             * Keep the connection open so that a file system can
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             * later ask us to connect it to another file system.
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             * This is necessary to support non-root mounts.
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             */
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            break;
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        case VFS_MOUNT:
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            vfs_mount(callid, &call);
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            break;
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        case VFS_OPEN:
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            vfs_open(callid, &call);
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            break;
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        case VFS_CLOSE:
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            vfs_close(callid, &call);
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            break;
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        case VFS_READ:
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            vfs_read(callid, &call);
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            break;
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        case VFS_WRITE:
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            vfs_write(callid, &call);
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            break;
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        case VFS_SEEK:
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            vfs_seek(callid, &call);
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            break;
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        case VFS_TRUNCATE:
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            vfs_truncate(callid, &call);
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            break;
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        case VFS_MKDIR:
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            vfs_mkdir(callid, &call);
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            break;
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        case VFS_UNLINK:
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            vfs_unlink(callid, &call);
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            break;
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        case VFS_RENAME:
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            vfs_rename(callid, &call);
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            break;
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        default:
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            ipc_answer_0(callid, ENOTSUP);
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            break;
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        }
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    }
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    /* TODO: cleanup after the client */
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}
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int main(int argc, char **argv)
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{
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    printf(NAME ": HelenOS VFS server\n");
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    /*
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     * Initialize the list of registered file systems.
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     */
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    list_initialize(&fs_head);
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    /*
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     * Initialize VFS node hash table.
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     */
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    if (!vfs_nodes_init()) {
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        printf(NAME ": Failed to initialize VFS node hash table\n");
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        return ENOMEM;
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    }
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    /*
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     * Allocate and initialize the Path Lookup Buffer.
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     */
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    list_initialize(&plb_head);
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    plb = as_get_mappable_page(PLB_SIZE);
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    if (!plb) {
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        printf(NAME ": Cannot allocate a mappable piece of address space\n");
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        return ENOMEM;
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    }
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    if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
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        AS_AREA_CACHEABLE) != plb) {
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        printf(NAME ": Cannot create address space area\n");
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        return ENOMEM;
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    }
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    memset(plb, 0, PLB_SIZE);
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    /*
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     * Set a connectio handling function/fibril.
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     */
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    async_set_client_connection(vfs_connection);
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2542 jermar 184
    /*
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     * Register at the naming service.
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     */
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    ipcarg_t phonead;
2637 cejka 188
    ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
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2542 jermar 190
    /*
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     * Start accepting connections.
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     */
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    printf(NAME ": Accepting connections\n");
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    async_manager();
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    return 0;
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}
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/**
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 * @}
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 */