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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. #include <libadt/list.h>
  38.  
  39. #define VFS_FIRST   FIRST_USER_METHOD
  40.  
  41. #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)  
  42.  
  43. typedef enum {
  44.     VFS_REGISTER = VFS_FIRST,
  45.     VFS_MOUNT,
  46.     VFS_UNMOUNT,
  47.     VFS_LOOKUP,
  48.     VFS_OPEN,
  49.     VFS_CREATE,
  50.     VFS_CLOSE,
  51.     VFS_READ,
  52.     VFS_WRITE,
  53.     VFS_SEEK,
  54.     VFS_LAST,       /* keep this the last member of the enum */
  55. } vfs_request_t;
  56.  
  57.  
  58. /**
  59.  * An instance of this structure is associated with a particular FS operation.
  60.  * It tells VFS if the FS supports the operation or maybe if a default one
  61.  * should be used.
  62.  */
  63. typedef enum {
  64.     VFS_OP_NULL = 0,
  65.     VFS_OP_DEFAULT,
  66.     VFS_OP_DEFINED
  67. } vfs_op_t;
  68.  
  69. #define FS_NAME_MAXLEN  20
  70.  
  71. /**
  72.  * A structure like this is passed to VFS by each individual FS upon its
  73.  * registration. It assosiates a human-readable identifier with each
  74.  * registered FS. More importantly, through this structure, the FS announces
  75.  * what operations it supports.
  76.  */
  77. typedef struct {
  78.     /** Unique identifier of the fs. */
  79.     char name[FS_NAME_MAXLEN];
  80.    
  81.     /** Operations. */
  82.     vfs_op_t ops[VFS_LAST - VFS_FIRST];
  83. } vfs_info_t;
  84.  
  85. typedef struct {
  86.     link_t fs_link;
  87.     vfs_info_t vfs_info;
  88.     ipcarg_t phone;
  89. } fs_info_t;
  90.  
  91. #endif
  92.  
  93. /**
  94.  * @}
  95.  */
  96.