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108 lines
3.7 KiB
C
108 lines
3.7 KiB
C
/*
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partition.h
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Functions for mounting and dismounting partitions
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on various block devices.
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _PARTITION_H
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#define _PARTITION_H
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#include "common.h"
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#include "cache.h"
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#include "lock.h"
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#define MIN_SECTOR_SIZE 512
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#define MAX_SECTOR_SIZE 4096
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/* Filesystem type */
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typedef enum {FS_UNKNOWN, FS_FAT12, FS_FAT16, FS_FAT32} FS_TYPE;
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typedef struct {
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sec_t fatStart;
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uint32_t sectorsPerFat;
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uint32_t lastCluster;
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uint32_t firstFree;
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uint32_t numberFreeCluster;
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uint32_t numberLastAllocCluster;
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} FAT;
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typedef struct {
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const DISC_INTERFACE* disc;
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CACHE* cache;
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/* Info about the partition */
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FS_TYPE filesysType;
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uint64_t totalSize;
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sec_t rootDirStart;
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uint32_t rootDirCluster;
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uint32_t numberOfSectors;
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sec_t dataStart;
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uint32_t bytesPerSector;
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uint32_t sectorsPerCluster;
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uint32_t bytesPerCluster;
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uint32_t fsInfoSector;
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FAT fat;
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/* Values that may change after construction */
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uint32_t cwdCluster; /* Current working directory cluster */
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int openFileCount;
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struct _FILE_STRUCT* firstOpenFile; /* The start of a linked list of files */
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mutex_t lock; /* A lock for partition operations */
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bool readOnly; /* If this is set, then do not try writing to the disc */
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char label[12]; /* Volume label */
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} PARTITION;
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/*
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Mount the supplied device and return a pointer to the struct necessary to use it
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*/
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PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cacheSize, uint32_t SectorsPerPage, sec_t startSector);
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/*
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Dismount the device and free all structures used.
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Will also attempt to synchronise all open files to disc.
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*/
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void _FAT_partition_destructor (PARTITION* partition);
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/*
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Return the partition specified in a path, as taken from the devoptab.
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*/
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PARTITION* _FAT_partition_getPartitionFromPath (const char* path);
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/*
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Create the fs info sector.
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*/
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void _FAT_partition_createFSinfo(PARTITION * partition);
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/*
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Read the fs info sector data.
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*/
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void _FAT_partition_readFSinfo(PARTITION * partition);
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/*
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Write the fs info sector data.
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*/
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void _FAT_partition_writeFSinfo(PARTITION * partition);
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#endif /* _PARTITION_H */
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