Subversion Repositories HelenOS

/*

 * Copyright (c) 2007 Konopa-Jelen-Majer

 * 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 FileSystemTask

 * @{

 */

/**

 * @file    fs.c

 * @brief   File system driver for HelenOS.

 */

#include <ipc/ipc.h>

#include <ipc/services.h>

#include <ipc/ns.h>

#include <sysinfo.h>

#include <io/io.h>

#include <as.h>

#include <ddi.h>

#include <align.h>

#include <bool.h>

#include <errno.h>

#include <async.h>

#include <cap.h>

#include <sys/mman.h>

#include "fs.h"

#include "dir.h"

#include "../console/console.h"

static int fs_call;

static ipc_call_t m_input;          /**< the input message used for request */

static ipc_callid_t callid;         /**< caller's number */

static int new_consument;       /**< if new consumer wants to connect to FS */

static int check_con;           /**< check of connection of consument */

static void prepare_message(void);

static int load_super(void);

static int new_consument_map(void);

/**

 * Respond to incoming requests from user tasks

 */

static void fs_connection(ipc_callid_t iid, ipc_call_t *icall)

{

    int result = 0;

    ipcarg_t arg = 0;

    ipc_answer_fast(iid, 0, 0, 0);

    while (1)

    {

        prepare_message();

        switch (fs_call)

        {

            case IPC_M_PHONE_HUNGUP:

                ipc_answer_fast(callid, 0,0,0);

                return;

            case FS_NEW_CONSUMER:

                if (!new_consument) {

                    result = FS_ECONNECT;  

                }

                else {

                    result = new_consument_map();  

                    if (!result) {

                        new_consument = FALSE;     

                    }

                }

                break;

            case IPC_M_AS_AREA_SEND:

                if (!new_consument)

                    result = FS_ECONNECT;      

                else {

                    result = 0;

                    arg = (uintptr_t)fp->buffer;

                    fp = &fproc[new_consument];

                    fp->connected = TRUE;

                    new_consument = FALSE;

                }

                break;

            case FS_DROP_CONSUMER:

                fproc->connected = FALSE;

                fproc->buffer = NULL;

                result = 0;

                break;

            default:

                if (check_con < 0) {

                    result = err_code;

                    check_con = TRUE;

                    break; 

                }

                if (FS_IN_RANGE(fs_call)) {  

                    result = call_vector[fs_call-FS_BASE]();

                }

                else {

                    result = FS_EBADCALL;

                }

                break; 

        }

        ipc_answer_fast(callid, result, arg, 0);

        arg = 0;       

    }  

}

/**

 * Extracts parameters from message and prepare them for later usage.

 */

void prepare_message(void)

{

    int shift, id_task;

    callid = async_get_call(&m_input);

    fs_call = IPC_GET_METHOD(m_input);

    if (fs_call == IPC_M_AS_AREA_SEND) {   

        if (!new_consument) {

            new_consument = FALSE;

        }

        return;

    }

    id_task = IPC_GET_ARG1(m_input);    

    /* Setup new consument. */

    if (fs_call == FS_NEW_CONSUMER) {

        if (!new_consument) {

            new_consument = id_task;

        }

        else {

            new_consument = FALSE;

        }

        return;

    }

    /* Other messages discard process of new consument connecting. */

    if (new_consument) {

        new_consument = FALSE;

    }

    if (id_task < 0 || id_task >= NR_PROCS) {

        check_con = FS_EINVAL;

        return;    

    }

    /* Switch to active consument. */

    fp = &fproc[id_task];

    /* Check if consument was connected. */

    if (!(fp->connected)) {

        check_con = FS_ENOTCONNECT;

        return;

    }

    /* Unpacking extended input message into message_params structure. */

    unpack_message(&message_params, m_input, fp->buffer);

}

/**

 * Map some memory to the task

 */

int new_consument_map()

{

    size_t size;

    task_id_t task_id;

    task_id = new_consument;   

    if (task_id < 0 || task_id >= NR_PROCS) {

        return FS_EINVAL;

    }

    fp = &fproc[task_id];

    size = ALIGN_UP(BLOCK_SIZE * sizeof(char), PAGE_SIZE);

    fp->buffer = as_get_mappable_page(size, PAGE_COLOR((uintptr_t)fp->buffer));

    return TRUE;

}

/* Reads in the superblock from image. */

int load_super(void)

{

    super_block_t *sp;

    if (!init_super_block())

        return FALSE;

        sp = get_super();

    if (read_super(sp) != OK)

    {

        print_console("Super block read error\n");

        return FALSE;

    }

    return TRUE;

}

/**

 * Basic initialization.

 */

static bool fs_init(void)

{

    register inode_t *rip;

    int bad, i;

    bad = 0;

    callid = SERVICE_FS;

    fp = (fproc_t *)NULL;

    print_console("FS initialization...");

    /* Block cache initialization. */

    if (!init_block())

        return FALSE;

    /* Loading superblock. */

    if (!load_super())

        return FALSE;

    for (i = 0; i < NR_PROCS; i++) {

        if (i == SERVICE_FS)

            continue;

        fp = &fproc[i];

        rip = get_inode(ROOT_INODE);

        fp->fp_rootdir = rip;

        dup_inode(rip);

        fp->fp_workdir = rip;

    }

    fp = &fproc[SERVICE_FS];

    /* Certain relations must hold for the file system to work at all. */

    if (SUPER_SIZE > BLOCK_SIZE) {

        print_console("SUPER_SIZE > BLOCK_SIZE\n");

        bad++;

    }

    if (BLOCK_SIZE % V1_INODE_SIZE != 0) { 

        print_console("BLOCK_SIZE mod V1_INODE_SIZE != 0\n");

        bad++;

    }

    if (OPEN_MAX > 127) {  

        print_console("OPEN_MAX > 127\n");

        bad++;

    }

    if (V1_INODE_SIZE != 32) { 

        print_console("V1 inode size != 32\n");

        bad++;

    }

    if (V2_INODE_SIZE != 64) { 

        print_console("V2 inode size != 64\n");

        bad++;

    }

    if (bad)

        return FALSE;

    /* New consument flag settings. */

    new_consument = FALSE;

    check_con = FALSE;

    print_console("OK\n");

    return TRUE;

}

/**

 * The initialization method for the FS task, it connects to the RD service

 * and then starts the asynchronous request listener for this task.

 */

int main(int argc, char **argv)

{

    int retval, flags;

    unsigned int size;

    /* Initializing printing functions. */

    if (!init_printing())

        return -1;

    print_console("FS task\n");

    /* Connection to SERVICE_RD service. */

    print_console("Connnection to SERVICE_RD...");

    if (connect_to_rd(&rd_phone, RD_CONN_ATTEMPTS))

        print_console("OK\n");

    else {

        print_console("FALSE\n");

        return -1;

    }

    /* Creating shared memory for usage with SERVICE_RD.  */

    print_console("Creating address space area for share with SERVICE_RD task...");

    size = ALIGN_UP(BLOCK_SIZE * sizeof(char), PAGE_SIZE);

    buffer = mmap(buffer, size, AS_AREA_READ | AS_AREA_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);

    if ((int)buffer < 0) {

        print_console_int("As_area_create error %d", (int)buffer);

        return -1;

    }

    print_console("OK\n");

    /* Mapping memory to SERVICE_RD. */

    print_console("Sending memory to RD_SERVICE...");

    flags = 0;

    flags = AS_AREA_READ | AS_AREA_WRITE;

    retval = async_req_3(rd_phone, IPC_M_AS_AREA_SEND, (uintptr_t)buffer, size, flags, NULL, NULL, NULL);

    if (retval < 0) {

        print_console_int("%d\n", retval);

        return -1;

    }

    print_console("OK\n");

    if (fs_init()) {

        ipcarg_t phonead;

        async_set_client_connection(fs_connection);

        /* Register service at nameserver */

        if (ipc_connect_to_me(PHONE_NS, SERVICE_FS, 0, &phonead) != 0)

            return -1;

        async_manager();

        /* Never reached */

        return 0;

    }

    return -1;

}

/**

 * @}

 */