blockdev/blockdev.c

   1 /*
   2  * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
   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
  30 #include <ext4_config.h>
  31 #include <ext4_blockdev.h>
  32 #include <ext4_errno.h>
  33
  34
  35 /**********************BLOCKDEV INTERFACE**************************************/
  36 static int blockdev_open(struct ext4_blockdev *bdev);
  37 static int blockdev_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
  38                          uint32_t blk_cnt);
  39 static int blockdev_bwrite(struct ext4_blockdev *bdev, const void *buf,
  40                           uint64_t blk_id, uint32_t blk_cnt);
  41 static int blockdev_close(struct ext4_blockdev *bdev);
  42 static int blockdev_lock(struct ext4_blockdev *bdev);
  43 static int blockdev_unlock(struct ext4_blockdev *bdev);
  44
  45 /******************************************************************************/
  46 EXT4_BLOCKDEV_STATIC_INSTANCE(blockdev, 512, 0, blockdev_open,
  47                               blockdev_bread, blockdev_bwrite, blockdev_close,
  48                               blockdev_lock, blockdev_unlock);
  49
  50 /******************************************************************************/
  51 static int blockdev_open(struct ext4_blockdev *bdev)
  52 {
  53         /*blockdev_open: skeleton*/
  54         return EIO;
  55 }
  56
  57 /******************************************************************************/
  58
  59 static int blockdev_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
  60                          uint32_t blk_cnt)
  61 {
  62         /*blockdev_bread: skeleton*/
  63         return EIO;
  64 }
  65
  66
  67 /******************************************************************************/
  68 static int blockdev_bwrite(struct ext4_blockdev *bdev, const void *buf,
  69                           uint64_t blk_id, uint32_t blk_cnt)
  70 {
  71         /*blockdev_bwrite: skeleton*/
  72         return EIO;
  73 }
  74 /******************************************************************************/
  75 static int blockdev_close(struct ext4_blockdev *bdev)
  76 {
  77         /*blockdev_close: skeleton*/
  78         return EIO;
  79 }
  80
  81 static int blockdev_lock(struct ext4_blockdev *bdev)
  82 {
  83         /*blockdev_lock: skeleton*/
  84         return EIO;
  85 }
  86
  87 static int blockdev_unlock(struct ext4_blockdev *bdev)
  88 {
  89         /*blockdev_unlock: skeleton*/
  90         return EIO;
  91 }
  92
  93 /******************************************************************************/
  94 struct ext4_blockdev *ext4_blockdev_get(void)
  95 {
  96         return &blockdev;
  97 }
  98 /******************************************************************************/
  99