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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 dprintf(...)    printf(__VA_ARGS__)
  40.  
  41. #define VFS_FIRST   FIRST_USER_METHOD
  42.  
  43. #define IPC_METHOD_TO_VFS_OP(m) ((m) - VFS_FIRST)  
  44.  
  45. typedef enum {
  46.     VFS_REGISTER = VFS_FIRST,
  47.     VFS_MOUNT,
  48.     VFS_UNMOUNT,
  49.     VFS_LOOKUP,
  50.     VFS_OPEN,
  51.     VFS_CREATE,
  52.     VFS_CLOSE,
  53.     VFS_READ,
  54.     VFS_WRITE,
  55.     VFS_SEEK,
  56.     VFS_LAST,       /* keep this the last member of the enum */
  57. } vfs_request_t;
  58.  
  59.  
  60. /**
  61.  * An instance of this structure is associated with a particular FS operation.
  62.  * It tells VFS if the FS supports the operation or maybe if a default one
  63.  * should be used.
  64.  */
  65. typedef enum {
  66.     VFS_OP_NULL = 0,
  67.     VFS_OP_DEFAULT,
  68.     VFS_OP_DEFINED
  69. } vfs_op_t;
  70.  
  71. #define FS_NAME_MAXLEN  20
  72.  
  73. /**
  74.  * A structure like this is passed to VFS by each individual FS upon its
  75.  * registration. It assosiates a human-readable identifier with each
  76.  * registered FS. More importantly, through this structure, the FS announces
  77.  * what operations it supports.
  78.  */
  79. typedef struct {
  80.     /** Unique identifier of the fs. */
  81.     char name[FS_NAME_MAXLEN];
  82.    
  83.     /** Operations. */
  84.     vfs_op_t ops[VFS_LAST - VFS_FIRST];
  85. } vfs_info_t;
  86.  
  87. typedef struct {
  88.     link_t fs_link;
  89.     vfs_info_t vfs_info;
  90.     ipcarg_t phone;
  91. } fs_info_t;
  92.  
  93. extern link_t fs_head;
  94.  
  95. extern void vfs_register(ipc_callid_t rid, ipc_call_t *request);
  96.  
  97. #endif
  98.  
  99. /**
  100.  * @}
  101.  */
  102.