osd-contiki/core/cfs/cfs-coffee.h
2009-05-04 22:29:48 +00:00

107 lines
3.6 KiB
C

/**
* \addtogroup cfs
* @{
*/
/*
* Copyright (c) 2008, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
#ifndef CFS_COFFEE_H
#define CFS_COFFEE_H
#include "cfs.h"
/**
* \file
* Header for the Coffee file system.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*
* \name Functions called from application programs
* @{
*/
/**
* \brief Reserve space for a file.
* \param name The filename.
* \param size The size of the file.
* \return 0 on success, -1 on failure.
*
* Coffee uses sequential page structures for files. The sequential
* structure can be reserved with a certain size. If a file has not
* been reserved when it is opened for the first time, it will be
* allocated with a default size.
*/
int cfs_coffee_reserve(const char *name, cfs_offset_t size);
/**
* \brief Configure the on-demand log file.
* \param file
* \param log_size
* \param log_entry_size
* \return 0 on success, -1 on failure.
*
* When file data is first modified, Coffee creates a micro log for the
* file. The micro log stores a table of modifications whose
* parameters--the log size and the log entry size--can be modified
* through the cfs_coffee_configure_log function.
*/
int cfs_coffee_configure_log(const char *file, unsigned log_size,
unsigned log_entry_size);
/**
* \brief Format the storage area assigned to Coffee.
* \return 0 on success, -1 on failure.
*
* Coffee formats the underlying storage by setting all bits to zero.
* Formatting must be done before using Coffee for the first time in
* a mote.
*/
int cfs_coffee_format(void);
/**
* \brief Points out a memory region that may not be altered during
* checkpointing operations that use the file system.
* \param size
* \return A pointer to the protected memory.
*
* This function returns the protected memory pointer and writes its size
* to the given parameter. Mainly used by sensornet checkpointing to protect
* the coffee state during CFS-based checkpointing operations.
*/
void *cfs_coffee_get_protected_mem(unsigned *size);
/** @} */
/** @} */
#endif /* !COFFEE_H */