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  1. /*
  2.  * Copyright (c) 2007 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup fs
  30.  * @{
  31.  */
  32.  
  33. #ifndef VFS_VFS_H_
  34. #define VFS_VFS_H_
  35.  
  36. #include <ipc/ipc.h>
  37.  
  38. #define VFS_FIRST   FIRST_USER_METHOD
  39.  
  40. #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)  
  41.  
  42. typedef enum {
  43.     VFS_REGISTER = VFS_FIRST,
  44.     VFS_MOUNT,
  45.     VFS_UNMOUNT,
  46.     VFS_OPEN,
  47.     VFS_CREATE,
  48.     VFS_CLOSE,
  49.     VFS_READ,
  50.     VFS_WRITE,
  51.     VFS_SEEK,
  52.     VFS_LAST,       /* keep this the last member of the enum */
  53. } vfs_request_t;
  54.  
  55.  
  56. /**
  57.  * An instance of this structure is associated with a particular FS operation.
  58.  * It tells VFS if the FS supports the operation or maybe if a default one
  59.  * should be used.
  60.  */
  61. typedef enum {
  62.     VFS_OP_NULL = 0,
  63.     VFS_OP_DEFAULT,
  64.     VFS_OP_DEFINED
  65. } vfs_op_t;
  66.  
  67. #define FS_NAME_MAXLEN  20
  68.  
  69. /**
  70.  * A structure like this is passed to VFS by each individual FS upon its
  71.  * registration. It assosiates a human-readable identifier with each
  72.  * registered FS. More importantly, through this structure, the FS announces
  73.  * what operations it supports.
  74.  */
  75. typedef struct {
  76.     /** Unique identifier of the fs. */
  77.     char name[FS_NAME_MAXLEN];
  78.    
  79.     /** Operations. */
  80.     vfs_op_t ops[VFS_LAST - VFS_FIRST];
  81. } vfs_info_t;
  82.  
  83. typedef struct {
  84.     link_t fs_link;
  85.     vfs_info_t vfs_info;
  86. } fs_info_t;
  87.  
  88. #endif
  89.  
  90. /**
  91.  * @}
  92.  */
  93.