sparse-disk.h

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/*
 * Copyright (c) 2012 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Obere Lagerstr. 30
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#ifndef SPARSE_DISK_H
#define SPARSE_DISK_H

#include <stddef.h>
#include <stdint.h>
#include <rtems.h>
#include <rtems/diskdevs.h>
#include <rtems/thread.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef struct {
  rtems_blkdev_bnum  block;
  void              *data;
} rtems_sparse_disk_key;

typedef struct rtems_sparse_disk rtems_sparse_disk;

typedef void (*rtems_sparse_disk_delete_handler)(rtems_sparse_disk *sparse_disk);

struct rtems_sparse_disk {
  rtems_mutex                      mutex;
  rtems_blkdev_bnum                blocks_with_buffer;
  size_t                           used_count;
  uint32_t                         media_block_size;
  rtems_sparse_disk_delete_handler delete_handler;
  uint8_t                          fill_pattern;
  rtems_sparse_disk_key           *key_table;
};

rtems_status_code rtems_sparse_disk_create_and_register(
  const char        *device_file_name,
  uint32_t           media_block_size,
  rtems_blkdev_bnum  blocks_with_buffer,
  rtems_blkdev_bnum  media_block_count,
  uint8_t            fill_pattern
);

void rtems_sparse_disk_free( rtems_sparse_disk *sparse_disk );

rtems_status_code rtems_sparse_disk_register(
  const char                       *device_file_name,
  rtems_sparse_disk                *sparse_disk,
  uint32_t                          media_block_size,
  rtems_blkdev_bnum                 blocks_with_buffer,
  rtems_blkdev_bnum                 media_block_count,
  uint8_t                           fill_pattern,
  rtems_sparse_disk_delete_handler  sparse_disk_delete
);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* SPARSE_DISK_H */