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/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
*
* IOLogicalDisk.h - Public interface for Logical Disk Object.
*
* HISTORY
* 05-Mar-91 Doug Mitchell at NeXT
* Created.
*
* IOLogicalDisk is an abstract superclass which conceptually overlays
* the IODiskDevice class and provides "logical partition" functionality.
* Unix File System I/O goes thru a subclass of IOLogicalDisk; other I/O
* usually goes thru a subclass of IODiskDevice (like SCSIDisk).
*
* The main functionality provided by an IOLogicalDisk is to map read and write
* requests to a physical device which has diffferent physical
* characteristics (block size, offset of partitions, etc.) than the
* IOLogicalDisk.
*
* An IOLogicalDisk is always associated with an IODiskDevice which actually
* performs all of IOLogicalDisk's I/O; this IODiskDevice's id is kept in
* _physDevice. An IOLogicalDisk is always in the same task as its associated
* _physDevice.
*
* IODiskDevice's _logicalDisk instance variable is used to chain together all
* of the IOLogicalDisks attached to a particular physDevice. In an
* IOLogicalDisk, logicalDisk points to the next IOLogicalDisk in a chain -
* e.g., partition a's logicalDisk variable points to the IOLogicalDisk
* instance for partition b. The chain is nil-terminated.
*/
#import <driverkit/return.h>
#import <driverkit/IODisk.h>
#ifdef KERNEL
#import <mach/mach_interface.h>
#else
#import <mach/mach.h>
#endif
@interface IOLogicalDisk:IODisk <IODiskReadingAndWriting>
/*
* Some notes on IODisk instance variables:
*
* -- The formatted flag is a don't care for LogicalDisk and its subclasses.
* This flag is only for use by other device-specific subclasses of
* IODiskDevice.
*
* -- The removable flag is always a copy of a LogicalDisk's physicalDisk's
* removable flag. This is set in the connectToPhysicalDisk method.
*/
{
@private
id _physicalDisk; /* a pointer to the
* IODiskDevice which actually
* does our work */
unsigned _partitionBase; /* offset from start of
* physDevice in
* blocSize blocks */
unsigned _physicalBlockSize; /* blockSize of physDevice,
* cached here for efficiency
*/
BOOL _instanceOpen;
int _IOLogicalDisk_reserved[4];
}
/*
* Other methods Implemented by IOLogicalDisk.
*/
/*
* Determine if this LogicalDisk (or any other subsequent logical disks in the
* _nextLogicalDisk list) are currently open. Returns 0 if none open, else
* 1.
*/
- (BOOL)isOpen;
/*
* Determine if any logical disks in the _physicalDisk's entire
* _nextLogicalDisk chain except for self are open.
*/
- (BOOL)isAnyOtherOpen;
/*
* Free self and any objects in logicalDisk chain.
*/
- free;
/*
* Open a connection to physical device.
*/
- (IOReturn)connectToPhysicalDisk : physicalDisk;
/*
* Get/set local instance variables.
*/
- (void)setPartitionBase : (unsigned)partBase;
- physicalDisk;
- (void)setPhysicalBlockSize : (unsigned)size;
- (u_int)physicalBlockSize;
- (BOOL)isInstanceOpen;
- (void)setInstanceOpen : (BOOL)isOpen;
/*
* Passed on to _physDevice.
*/
- (IOReturn)isDiskReady : (BOOL)prompt;
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.