nes-proj/core/cfs/cfs-coffee.h

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/**
* \addtogroup cfs
* @{
*/
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/*
* 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.
*
*/
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#ifndef CFS_COFFEE_H
#define CFS_COFFEE_H
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/**
* \file
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* Header for the Coffee file system.
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* \author
* Nicolas Tsiftes <nvt@sics.se>
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*
* \name Functions called from application programs
* @{
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*/
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/**
* \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 append-only files. The
* sequential structure can be reserved with a certain. If no reservation
* has been done, files will be set to a default size once opened for
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* the first time.
*/
int cfs_coffee_reserve(const char *name, uint32_t size);
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/**
* \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 where each record
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* is of log_entry_size.
*/
int cfs_coffee_configure_log(const char *file, unsigned log_size,
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unsigned log_entry_size);
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/**
* \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.
* This operation is required prior to using Coffee for the first time
* in a system.
*/
int cfs_coffee_format(void);
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/**
* \brief Gives information about the file descriptor area in Coffee.
* \param size
* \return A pointer to the file descriptor set.
*
* This function returns the file descriptor set and sets the size
* argument to the number of bytes that the set uses. Mainly used for
* sensornet checkpointing to protect the file descriptor while rolling
* back the state from a file.
*/
void *cfs_coffee_get_fd_set(unsigned *size);
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/** @} */
/** @} */
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#endif /* !COFFEE_H */