Return to gttpinfo.c CVS log

Up to [WindowsNT SDKs] / ntddk / src / scsi / qic117

Annotation of ntddk/src/scsi/qic117/gttpinfo.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:     gttpinfo.c
        !             9: 
        !            10: Abstract:
        !            11: 
        !            12:     Gets volume information (end of data,  number of volumes, etc).
        !            13: 
        !            14: Revision History:
        !            15: 
        !            16: 
        !            17: 
        !            18: --*/
        !            19: 
        !            20: //
        !            21: // include files
        !            22: //
        !            23: 
        !            24: #include <ntddk.h>
        !            25: #include <ntddtape.h>
        !            26: #include "common.h"
        !            27: #include "q117.h"
        !            28: #include "protos.h"
        !            29: 
        !            30: 
        !            31: STATUS
        !            32: q117ReadVolumeEntry(
        !            33:     PVOLUME_TABLE_ENTRY VolumeEntry,
        !            34:     PQ117_CONTEXT Context
        !            35:     )
        !            36: 
        !            37: /*++
        !            38: 
        !            39: Routine Description:
        !            40: 
        !            41:     Transfers the VolDir structure to the given location and defines
        !            42:     CurrentOperation.EndOfUsedTape if called for the VolDir structure that has 0 for its
        !            43:     startblock.
        !            44: 
        !            45:     This routine will also define 'CurrentOperation.EndOfUsedTape' provided it is called for
        !            46:     all the entries that are on the Tape Directory.  (This is determined
        !            47:     when the 'startblock' field of the VolDir is 0.
        !            48: 
        !            49: Arguments:
        !            50: 
        !            51:     TheVolumeTable -
        !            52: 
        !            53:     Context -
        !            54: 
        !            55: Return Value:
        !            56: 
        !            57:     NoErr,  any Driver error except BadBlk, RdncUnsc,
        !            58:     <LinkRC>, EndOfVol (if caller exceeds block of 256th VolDir entry).
        !            59: 
        !            60: --*/
        !            61: 
        !            62: {
        !            63:     STATUS ret;
        !            64:     ULONG size;
        !            65: 
        !            66:     //
        !            67:     // Read in a volume entry
        !            68:     //
        !            69:     size = sizeof(*VolumeEntry);
        !            70: 
        !            71:     ret = q117ReadTape(VolumeEntry, &size, Context);
        !            72: 
        !            73:     if (Context->CurrentOperation.EndOfUsedTape != 0) {
        !            74: 
        !            75:         //
        !            76:         // This is an extraneous read by a command line.
        !            77:         //
        !            78: 
        !            79:         return(ret);
        !            80: 
        !            81:     }
        !            82: 
        !            83:     if (ret==RdncUnsc) {
        !            84: 
        !            85:         //
        !            86:         // Assume that there was a valid entry here.  This assumption affects StartBack().
        !            87:         //
        !            88: 
        !            89:         Context->ActiveVolumeNumber++;
        !            90: 
        !            91:         //
        !            92:         // Will not define the 'CurrentTape.LastUsedSegment' unless we look at a good block.
        !            93:         //
        !            94: 
        !            95:         Context->CurrentTape.LastUsedSegment=0;
        !            96: 
        !            97:     } else {
        !            98: 
        !            99:         if (ret==NoErr) {
        !           100: 
        !           101:             if (VolumeEntry->Signature != VolumeTableSig) {
        !           102: 
        !           103:                 Context->CurrentOperation.EndOfUsedTape = Context->CurrentTape.LastUsedSegment;
        !           104:                 ret = EndOfVol;
        !           105: 
        !           106:             } else {
        !           107: 
        !           108:                 Context->CurrentTape.LastUsedSegment = VolumeEntry->EndingSegment;
        !           109:                 Context->ActiveVolumeNumber++;
        !           110: 
        !           111:                 //
        !           112:                 // A certain vendor who shall remain anonymous, but whose
        !           113:                 // initials are S.C.O, puts into its volume headers a starting
        !           114:                 // and ending segment, but not a data size. If we detect this
        !           115:                 // condition, we will attempt to fake it by adding up the
        !           116:                 // valid sectors & and stuffing the result into DataSize.
        !           117:                 //
        !           118: 
        !           119:                 if (!VolumeEntry->DataSize) {
        !           120: 
        !           121:                     q117FakeDataSize(VolumeEntry, Context);
        !           122: 
        !           123:                 }
        !           124: 
        !           125:             }
        !           126: 
        !           127:         } else {
        !           128: 
        !           129:             if (ret == EndOfVol) {
        !           130: 
        !           131:                 Context->CurrentOperation.EndOfUsedTape = Context->CurrentTape.LastUsedSegment;
        !           132: 
        !           133:             }
        !           134:         }
        !           135:     }
        !           136: 
        !           137:     //
        !           138:     // if we have read the last volume entry then set the tape statistics
        !           139:     //
        !           140: 
        !           141:     if (Context->CurrentOperation.EndOfUsedTape) {
        !           142: 
        !           143:         q117SetTpSt(Context);
        !           144: 
        !           145:     }
        !           146:     return(ret);
        !           147: }
        !           148: 
        !           149: 
        !           150: VOID
        !           151: q117FakeDataSize(
        !           152:     IN OUT PVOLUME_TABLE_ENTRY TheVolumeTable,
        !           153:     IN PQ117_CONTEXT Context
        !           154:     )
        !           155: 
        !           156: /*++
        !           157: 
        !           158: Routine Description:
        !           159: 
        !           160:     This routine will fake the volume's data size by calculating the total
        !           161:     amount of data contained in the segments between (inclusive) the starting
        !           162:     and ending segments as given in the volume table entry.
        !           163:     It assumes that the bad sector map is accurate.
        !           164:     Called from q117ReadVolumeEntry() only.
        !           165: 
        !           166: Arguments:
        !           167: 
        !           168:     TheVolumeTable -
        !           169: 
        !           170:     Context -
        !           171: 
        !           172: Return Value:
        !           173: 
        !           174:     None
        !           175: 
        !           176: --*/
        !           177: 
        !           178: {
        !           179:     SEGMENT segment;                      // Segment we are looking at
        !           180:     ULONG datasize = (LONG)0;     // accumulator
        !           181: 
        !           182:     for(segment = TheVolumeTable->StartSegment;
        !           183:         segment <= TheVolumeTable->EndingSegment ; ++segment) {
        !           184: 
        !           185:         //
        !           186:         // count good data in each segment.
        !           187:         //
        !           188: 
        !           189:         datasize += (ULONG)q117GoodDataBytes(segment,Context);
        !           190: 
        !           191:     }
        !           192: 
        !           193:     //
        !           194:     // give back the results
        !           195:     //
        !           196: 
        !           197:     TheVolumeTable->DataSize = datasize;
        !           198: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.