167 lines
5.9 KiB
C
167 lines
5.9 KiB
C
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/*******************************************************************************
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* *
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* M-Systems Confidential *
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* Copyright (C) M-Systems Flash Disk Pioneers Ltd. 1995-2001 *
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* All Rights Reserved *
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* *
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*******************************************************************************
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* *
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* NOTICE OF M-SYSTEMS OEM *
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* SOFTWARE LICENSE AGREEMENT *
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* *
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* THE USE OF THIS SOFTWARE IS GOVERNED BY A SEPARATE LICENSE AGREEMENT *
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* BETWEEN THE OEM AND M-SYSTEMS. REFER TO THAT AGREEMENT FOR THE SPECIFIC *
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* TERMS AND CONDITIONS OF USE, OR CONTACT M-SYSTEMS FOR LICENSE *
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* ASSISTANCE: *
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* E-MAIL = info@m-sys.com *
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* *
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*******************************************************************************
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* *
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* Module: FATFILT *
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* *
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* This module implements installable FAT12/16 filters. It supports up to *
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* SOCKETS sockets, with up to FL_MAX_DISKS_PER_SOCKET disks per socket. *
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* Each disk can contain up to FL_MAX_PARTS_PER_DISK partitions on it, with *
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* maximum depth of partition nesting in extended partitions equal to *
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* MAX_PARTITION_DEPTH. *
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* *
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* In order for this module to work, disks must be abs.mounted rather then *
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* mounted. In latter case, this module won't detect any of disk's *
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* partitions, and won't install FAT filters. *
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* *
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* This module uses more then 512 bytes of stack space in case if MALLOC is *
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* not enabled. *
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* *
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*******************************************************************************/
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/*
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* $Log: V:/Flite/archives/TrueFFS5/Src/FATFILT.H_V $
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*
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* Rev 1.3 Apr 10 2001 23:54:52 oris
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* Removed FL_MAX_DISKS_PER_SOCKET definition.
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*
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* Rev 1.2 Apr 09 2001 15:01:00 oris
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* Change static allocation to dynamic allocations.
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*
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* Rev 1.1 Apr 01 2001 07:51:24 oris
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* New implementation of fat filter.
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*
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* Rev 1.0 19 Feb 2001 21:16:14 andreyk
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* Initial revision.
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*/
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#ifndef FLFF_H
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#define FLFF_H
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#include "dosformt.h"
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#include "flreq.h"
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/* number of entries in disk's partition table */
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#define FL_PART_TBL_ENTRIES 4
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/* max number of partitions (filesystem volumes) per disk */
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#define FL_MAX_PARTS_PER_DISK (FL_PART_TBL_ENTRIES + MAX_PARTITION_DEPTH)
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/*
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* Generic 'initialization status' type
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*/
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typedef enum {
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flStateNotInitialized = 0,
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flStateInitInProgress = 1,
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flStateInitialized = 2
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} FLState;
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/*
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* Disk partition (filesystem volume). Multiple partitions are allowed
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* on the disk.
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*/
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typedef struct {
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int handle; /* disk's TFFS handle */
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int type; /* FAT16_PARTIT */
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int flags; /* VOLUME_12BIT_FAT etc. */
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FLBoolean ffEnabled; /* FAT filter is enabled on that part. */
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SectorNo startSecNo; /* sectorNo where partition starts */
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SectorNo sectors; /* (info) total sectors in partition */
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SectorNo firstFATsecNo; /* sectorNo of 1st sector of 1st FAT */
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SectorNo lastFATsecNo; /* sectorNo of last sector of 1st FAT */
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SectorNo firstDataSecNo;
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unsigned clusterSize; /* Cluster size in sectors */
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} FLffVol;
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/*
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* Disk with multiple partitions. Multiple disks are allowed on socket.
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*/
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typedef struct {
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int handle; /* disk's TFFS handle */
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FLState ffstate; /* FAT filter init. state */
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int parts; /* total FAT12/16 partitions found */
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FLffVol * part[FL_MAX_PARTS_PER_DISK];
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SectorNo secToWatch; /* used to track disk partitioning */
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char * buf; /* scratch buffer */
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} FLffDisk;
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/*
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* Master Boot Record/Extended Boot Record of the disk
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*/
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typedef struct {
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char reserved[0x1be];
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struct {
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unsigned char activeFlag; /* 80h = bootable */
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unsigned char startingHead;
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LEushort startingCylinderSector;
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char type;
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unsigned char endingHead;
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LEushort endingCylinderSector;
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Unaligned4 startingSectorOfPartition;
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Unaligned4 sectorsInPartition;
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} parts [FL_PART_TBL_ENTRIES];
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LEushort signature; /* = PARTITION_SIGNATURE */
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} flMBR;
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/*
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* FAT Filter API
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*/
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#if defined(ABS_READ_WRITE) && !defined(FL_READ_ONLY)
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extern FLStatus ffCheckBeforeWrite (IOreq FAR2 *ioreq);
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extern FLStatus flffControl (int devNo, int partNo, FLState state);
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extern FLffDisk* flffInfo (int devNo);
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#endif
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#endif /* FLFF_H */
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