source: mainline/uspace/srv/vfs/vfs.h@ d2d0baf

/*
 * Copyright (c) 2007 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 fs
 * @{
 */ 

#ifndef VFS_VFS_H_
#define VFS_VFS_H_

#include <ipc/ipc.h>
#include <libadt/list.h>

#define VFS_FIRST       FIRST_USER_METHOD

#define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)       

typedef enum {
        VFS_REGISTER = VFS_FIRST,
        VFS_MOUNT,
        VFS_UNMOUNT,
        VFS_LOOKUP,
        VFS_OPEN,
        VFS_CREATE,
        VFS_CLOSE,
        VFS_READ,
        VFS_WRITE,
        VFS_SEEK,
        VFS_LAST,               /* keep this the last member of the enum */
} vfs_request_t;


/**
 * An instance of this structure is associated with a particular FS operation.
 * It tells VFS if the FS supports the operation or maybe if a default one
 * should be used.
 */
typedef enum {
        VFS_OP_NULL = 0,
        VFS_OP_DEFAULT,
        VFS_OP_DEFINED
} vfs_op_t;

#define FS_NAME_MAXLEN  20

/**
 * A structure like this is passed to VFS by each individual FS upon its
 * registration. It assosiates a human-readable identifier with each
 * registered FS. More importantly, through this structure, the FS announces
 * what operations it supports.
 */
typedef struct {
        /** Unique identifier of the fs. */
        char name[FS_NAME_MAXLEN];
        
        /** Operations. */
        vfs_op_t ops[VFS_LAST - VFS_FIRST];
} vfs_info_t;

typedef struct {
        link_t fs_link;
        vfs_info_t vfs_info;
        ipcarg_t phone;
} fs_info_t;

#endif

/**
 * @}
 */