tmpfs.c

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/*
 * Copyright (c) 2006 Martin Decky
 * 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.
 */

#include "tmpfs.h"
#include <ipc/services.h>
#include <ipc/ns.h>
#include <async.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <task.h>
#include <libfs.h>
#include "../../vfs/vfs.h"

#define NAME "tmpfs"


vfs_info_t tmpfs_vfs_info = {
        .name = NAME,
        .concurrent_read_write = false,
        .write_retains_size = false,
};

fs_reg_t tmpfs_reg;

static void tmpfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        if (iid) {
                /*
                 * This only happens for connections opened by
                 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
                 * created by IPC_M_CONNECT_TO_ME.
                 */
                async_answer_0(iid, EOK);
        }
        
        dprintf(NAME ": connection opened\n");
        while (1) {
                ipc_callid_t callid;
                ipc_call_t call;
        
                callid = async_get_call(&call);
                switch  (IPC_GET_IMETHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        return;
                case VFS_OUT_MOUNTED:
                        tmpfs_mounted(callid, &call);
                        break;
                case VFS_OUT_MOUNT:
                        tmpfs_mount(callid, &call);
                        break;
                case VFS_OUT_UNMOUNTED:
                        tmpfs_unmounted(callid, &call);
                        break;
                case VFS_OUT_UNMOUNT:
                        tmpfs_unmount(callid, &call);
                        break;
                case VFS_OUT_LOOKUP:
                        tmpfs_lookup(callid, &call);
                        break;
                case VFS_OUT_READ:
                        tmpfs_read(callid, &call);
                        break;
                case VFS_OUT_WRITE:
                        tmpfs_write(callid, &call);
                        break;
                case VFS_OUT_TRUNCATE:
                        tmpfs_truncate(callid, &call);
                        break;
                case VFS_OUT_CLOSE:
                        tmpfs_close(callid, &call);
                        break;
                case VFS_OUT_DESTROY:
                        tmpfs_destroy(callid, &call);
                        break;
                case VFS_OUT_OPEN_NODE:
                        tmpfs_open_node(callid, &call);
                        break;
                case VFS_OUT_STAT:
                        tmpfs_stat(callid, &call);
                        break;
                case VFS_OUT_SYNC:
                        tmpfs_sync(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOTSUP);
                        break;
                }
        }
}

int main(int argc, char **argv)
{
        printf(NAME ": HelenOS TMPFS file system server\n");

        if (!tmpfs_init()) {
                printf(NAME ": failed to initialize TMPFS\n");
                return -1;
        }

        int vfs_phone = service_connect_blocking(SERVICE_VFS, 0, 0);
        if (vfs_phone < EOK) {
                printf(NAME ": Unable to connect to VFS\n");
                return -1;
        }

        int rc = fs_register(vfs_phone, &tmpfs_reg, &tmpfs_vfs_info,
            tmpfs_connection);
        if (rc != EOK) {
                printf(NAME ": Failed to register file system (%d)\n", rc);
                return rc;
        }

        printf(NAME ": Accepting connections\n");
        task_retval(0);
        async_manager();
        /* not reached */
        return 0;
}

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