source: mainline/uspace/srv/fs/tmpfs/tmpfs.c

/*
 * 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.
 */

/** @addtogroup tmpfs
 * @{
 */

/**
 * @file        tmpfs.c
 * @brief       File system driver for in-memory file system.
 *
 * Every instance of tmpfs exists purely in memory and has neither a disk layout
 * nor any permanent storage (e.g. disk blocks). With each system reboot, data
 * stored in a tmpfs file system is lost.
 */

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

#define NAME  "tmpfs"

vfs_info_t tmpfs_vfs_info = {
        .name = NAME,
        .concurrent_read_write = false,
        .write_retains_size = false,
        .instance = 0,
};

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

        if (argc == 3) {
                if (!str_cmp(argv[1], "--instance"))
                        tmpfs_vfs_info.instance = strtol(argv[2], NULL, 10);
                else {
                        printf("%s: Unrecognized parameters", NAME);
                        return -1;
                }
        }

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

        errno_t rc;
        async_sess_t *vfs_sess = service_connect_blocking(SERVICE_VFS,
            INTERFACE_VFS_DRIVER, 0, &rc);
        if (!vfs_sess) {
                printf("%s: Unable to connect to VFS: %s\n", NAME, str_error(rc));
                return -1;
        }

        rc = fs_register(vfs_sess, &tmpfs_vfs_info, &tmpfs_ops,
            &tmpfs_libfs_ops);
        if (rc != EOK) {
                printf("%s: Failed to register file system: %s\n", NAME,
                    str_error(rc));
                return rc;
        }

        printf("%s: Accepting connections\n", NAME);
        task_retval(0);
        async_manager();

        /* Not reached */
        return 0;
}

/**
 * @}
 */