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Annotation of ntddk/src/scsi/qic117/selvol.c, revision 1.1

1.1     ! root        1: /*++
        !             2: 
        !             3: Copyright (c) 1993 - Colorado Memory Systems, Inc.
        !             4: All Rights Reserved
        !             5: 
        !             6: Module Name:
        !             7: 
        !             8:     selvol.c
        !             9: 
        !            10: Abstract:
        !            11: 
        !            12:     Sets "state" to read an existing QIC-40/80 volume.
        !            13: 
        !            14: Revision History:
        !            15: 
        !            16: 
        !            17: 
        !            18: 
        !            19: --*/
        !            20: 
        !            21: //
        !            22: // include files
        !            23: //
        !            24: 
        !            25: #include <ntddk.h>
        !            26: #include <ntddtape.h>
        !            27: #include "common.h"
        !            28: #include "q117.h"
        !            29: #include "protos.h"
        !            30: 
        !            31: 
        !            32: STATUS
        !            33: q117SelVol (
        !            34:     PVOLUME_TABLE_ENTRY TheVolumeTable,
        !            35:     PQ117_CONTEXT Context
        !            36:     )
        !            37: 
        !            38: /*++
        !            39: 
        !            40: Routine Description:
        !            41: 
        !            42:     May be called from SelectVol() or StBk().  Decides how many tracks
        !            43:     to read in to start a backup or restore.  Allocates memory for
        !            44:     track buffers and redundancy data and IORequest structures through
        !            45:     ArrangeMem().
        !            46: 
        !            47: Arguments:
        !            48: 
        !            49:     TheVolumeTable - the tape directory entry for this volume.
        !            50: 
        !            51:     Context -
        !            52: 
        !            53: Return Value:
        !            54: 
        !            55:     NoErr, any Driver error except BadBlk, RdncUnsc, <LinkRC>,
        !            56:     <EndOfVol>, TapeFull.
        !            57: 
        !            58: --*/
        !            59: 
        !            60: {
        !            61:     LONG ret = NoErr;
        !            62: 
        !            63:     //
        !            64:     // set up global variables
        !            65:     //
        !            66:     Context->CurrentOperation.LastSegment = TheVolumeTable->EndingSegment;
        !            67:     Context->CurrentOperation.CurrentSegment = TheVolumeTable->StartSegment;
        !            68:     Context->CurrentOperation.LastSegmentRead = Context->CurrentOperation.CurrentSegment - 1;
        !            69:     Context->CurrentOperation.BytesOnTape = TheVolumeTable->DataSize;
        !            70:     Context->CurrentMark = 0;
        !            71:     Context->CurrentOperation.BytesRead = 0;
        !            72:     //
        !            73:     // force a read of the first segment (if skipblock not called)
        !            74:     //
        !            75:     Context->CurrentOperation.SegmentBytesRemaining = 0;
        !            76: 
        !            77:     if (TheVolumeTable->SequenceNumber == 1) {
        !            78:         Context->CurrentOperation.SegmentStatus = NoErr;
        !            79:     }
        !            80: 
        !            81:     return(ret);
        !            82: }

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