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2006 decky 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Martin Decky
2690 jermar 3 
 * Copyright (c) 2008 Jakub Jermar
2006 decky 4 
 * 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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/**
2529 jermar 35 
 * @file    fat.c
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 * @brief   FAT file system driver for HelenOS.
2006 decky 37 
 */
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2627 jermar 39 
#include "fat.h"
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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 <unistd.h>
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#include <stdio.h>
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#include <libfs.h>
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#include "../../vfs/vfs.h"
2006 decky 48 
 
2532 jermar 49 
 
2529 jermar 50 
vfs_info_t fat_vfs_info = {
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    .name = "fat",
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};
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2643 jermar 54 
fs_reg_t fat_reg;
2543 jermar 55 
 
2536 jermar 56 
/**
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 * This connection fibril processes VFS requests from VFS.
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 *
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 * In order to support simultaneous VFS requests, our design is as follows.
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 * The connection fibril accepts VFS requests from VFS. If there is only one
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 * instance of the fibril, VFS will need to serialize all VFS requests it sends
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 * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO
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 * call. In that case, a new connection fibril will be created, which in turn
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 * will accept the call. Thus, a new phone will be opened for VFS.
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 *
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 * There are few issues with this arrangement. First, VFS can run out of
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 * available phones. In that case, VFS can close some other phones or use one
2627 jermar 68 
 * phone for more serialized requests. Similarily, FAT can refuse to duplicate
2536 jermar 69 
 * the connection. VFS should then just make use of already existing phones and
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 * route its requests through them. To avoid paying the fibril creation price
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 * upon each request, FAT might want to keep the connections open after the
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 * request has been completed.
2531 jermar 73 
 */
2536 jermar 74 
static void fat_connection(ipc_callid_t iid, ipc_call_t *icall)
2531 jermar 75 
{
2536 jermar 76 
    if (iid) {
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        /*
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         * This only happens for connections opened by
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         * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
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         * created by IPC_M_CONNECT_TO_ME.
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         */
2619 jermar 82 
        ipc_answer_0(iid, EOK);
2536 jermar 83 
    }
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    dprintf("VFS-FAT connection established.\n");
2531 jermar 86 
    while (1) {
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        ipc_callid_t callid;
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        ipc_call_t call;
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        callid = async_get_call(&call);
2536 jermar 91 
        switch  (IPC_GET_METHOD(call)) {
4581 mejdrech 92 
        case IPC_M_PHONE_HUNGUP:
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            return;
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        case VFS_OUT_MOUNTED:
3110 jermar 95 
            fat_mounted(callid, &call);
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            break;
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        case VFS_OUT_MOUNT:
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            fat_mount(callid, &call);
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            break;
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        case VFS_OUT_LOOKUP:
2627 jermar 101 
            fat_lookup(callid, &call);
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            break;
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        case VFS_OUT_READ:
3307 jermar 104 
            fat_read(callid, &call);
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            break;
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        case VFS_OUT_WRITE:
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            fat_write(callid, &call);
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            break;
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        case VFS_OUT_TRUNCATE:
4153 mejdrech 110 
            fat_truncate(callid, &call);
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            break;
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        case VFS_OUT_STAT:
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            fat_stat(callid, &call);
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            break;
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        case VFS_OUT_CLOSE:
4581 mejdrech 116 
            fat_close(callid, &call);
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            break;
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        case VFS_OUT_DESTROY:
4153 mejdrech 119 
            fat_destroy(callid, &call);
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            break;
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        case VFS_OUT_OPEN_NODE:
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            fat_open_node(callid, &call);
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            break;
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        case VFS_OUT_SYNC:
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            fat_sync(callid, &call);
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            break;
2536 jermar 127 
        default:
2619 jermar 128 
            ipc_answer_0(callid, ENOTSUP);
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            break;
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        }
2531 jermar 131 
    }
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}
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2006 decky 134 
int main(int argc, char **argv)
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{
2532 jermar 136 
    int vfs_phone;
3110 jermar 137 
    int rc;
2529 jermar 138 
 
4153 mejdrech 139 
    printf("fat: HelenOS FAT file system server.\n");
2532 jermar 140 
 
3110 jermar 141 
    rc = fat_idx_init();
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    if (rc != EOK)
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        goto err;
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4153 mejdrech 145 
    vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
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    if (vfs_phone < EOK) {
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        printf("fat: failed to connect to VFS\n");
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        return -1;
2529 jermar 149 
    }
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2643 jermar 151 
    rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection);
2531 jermar 152 
    if (rc != EOK) {
3110 jermar 153 
        fat_idx_fini();
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        goto err;
2531 jermar 155 
    }
2536 jermar 156 
 
2644 jermar 157 
    dprintf("FAT filesystem registered, fs_handle=%d.\n",
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        fat_reg.fs_handle);
2532 jermar 159 
 
2568 jermar 160 
    async_manager();
2534 jermar 161 
    /* not reached */
2006 decky 162 
    return 0;
3110 jermar 163 
 
164 
err:
165 
    printf("Failed to register the FAT file system (%d)\n", rc);
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    return rc;
2006 decky 167 
}
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169 
/**
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 * @}
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 */