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Annotation of XNU/iokit/Families/IOStorage/IOStorage.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: 
        !            23: #include <IOKit/assert.h>
        !            24: #include <IOKit/IOLib.h>
        !            25: #include <IOKit/IOSyncer.h>
        !            26: #include <IOKit/storage/IOStorage.h>
        !            27: 
        !            28: #define super IOService
        !            29: OSDefineMetaClass(IOStorage, IOService)
        !            30: OSDefineAbstractStructors(IOStorage, IOService)
        !            31: 
        !            32: // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        !            33: // Local Functions
        !            34: 
        !            35: static void storageCompletion(void *   target,
        !            36:                               void *   parameter,
        !            37:                               IOReturn status,
        !            38:                               UInt64   actualByteCount)
        !            39: {
        !            40:     //
        !            41:     // Internal completion routine for synchronous versions of read and write.
        !            42:     //
        !            43: 
        !            44:     if (parameter)  *((UInt64 *)parameter) = actualByteCount;
        !            45:     ((IOSyncer *)target)->signal(status);
        !            46: }
        !            47: 
        !            48: // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        !            49: 
        !            50: IOReturn IOStorage::read(IOService *          client,
        !            51:                          UInt64               byteStart,
        !            52:                          IOMemoryDescriptor * buffer,
        !            53:                          UInt64 *             actualByteCount = 0)
        !            54: {
        !            55:     //
        !            56:     // Read data from the storage object at the specified byte offset into the
        !            57:     // specified buffer, synchronously.   When the read completes, this method
        !            58:     // will return to the caller.  The actual byte count field is optional.
        !            59:     //
        !            60: 
        !            61:     IOStorageCompletion        completion;
        !            62:     IOSyncer *          completionSyncer;
        !            63: 
        !            64:     // Initialize the lock we will synchronize against.
        !            65: 
        !            66:     completionSyncer = IOSyncer::create();
        !            67: 
        !            68:     // Fill in the completion information for this request.
        !            69: 
        !            70:     completion.target    = completionSyncer;
        !            71:     completion.action    = storageCompletion;
        !            72:     completion.parameter = actualByteCount;
        !            73: 
        !            74:     // Issue the asynchronous read.
        !            75: 
        !            76:     read(client, byteStart, buffer, completion);
        !            77: 
        !            78:     // Wait for the read to complete.
        !            79: 
        !            80:     return completionSyncer->wait();
        !            81: }
        !            82: 
        !            83: // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        !            84: 
        !            85: IOReturn IOStorage::write(IOService *          client,
        !            86:                           UInt64               byteStart,
        !            87:                           IOMemoryDescriptor * buffer,
        !            88:                           UInt64 *             actualByteCount = 0)
        !            89: {
        !            90:     //
        !            91:     // Write data into the storage object at the specified byte offset from the
        !            92:     // specified buffer, synchronously.   When the write completes, this method
        !            93:     // will return to the caller.  The actual byte count field is optional.
        !            94:     //
        !            95: 
        !            96:     IOStorageCompletion completion;
        !            97:     IOSyncer *          completionSyncer;
        !            98: 
        !            99:     // Initialize the lock we will synchronize against.
        !           100: 
        !           101:     completionSyncer = IOSyncer::create();
        !           102: 
        !           103:     // Fill in the completion information for this request.
        !           104: 
        !           105:     completion.target    = completionSyncer;
        !           106:     completion.action    = storageCompletion;
        !           107:     completion.parameter = actualByteCount;
        !           108: 
        !           109:     // Issue the asynchronous write.
        !           110: 
        !           111:     write(client, byteStart, buffer, completion);
        !           112: 
        !           113:     // Wait for the write to complete.
        !           114: 
        !           115:     return completionSyncer->wait();
        !           116: }

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