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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: }
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