106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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LogPgSup.c
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Abstract:
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This module implements support for manipulating log pages.
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Author:
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Brian Andrew [BrianAn] 20-June-1991
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Revision History:
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--*/
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#include "lfsprocs.h"
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//
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// The debug trace level
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//
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#define Dbg (DEBUG_TRACE_LOG_PAGE_SUP)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, LfsNextLogPageOffset)
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#endif
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VOID
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LfsNextLogPageOffset (
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IN PLFCB Lfcb,
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IN LONGLONG CurrentLogPageOffset,
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OUT PLONGLONG NextLogPageOffset,
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OUT PBOOLEAN Wrapped
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)
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/*++
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Routine Description:
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This routine will compute the offset in the log file of the next log
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page.
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Arguments:
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Lfcb - This is the file control block for the log file.
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CurrentLogPageOffset - This is the file offset of the current log page.
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NextLogPageOffset - Address to store the next log page to use.
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Wrapped - This is a pointer to a boolean variable that, if present,
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we use to indicate whether we wrapped in the log file.
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Return Value:
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None.
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--*/
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{
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PAGED_CODE();
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DebugTrace( +1, Dbg, "LfsNextLogPageOffset: Entered\n", 0 );
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DebugTrace( 0, Dbg, "Lfcb -> %08lx\n", Lfcb );
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DebugTrace( 0, Dbg, "CurrentLogPageOffset (Low) -> %08lx\n", CurrentLogPageOffset.LowPart );
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DebugTrace( 0, Dbg, "CurrentLogPageOffset (High) -> %08lx\n", CurrentLogPageOffset.HighPart );
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DebugTrace( 0, Dbg, "Wrapped -> %08lx\n", Wrapped );
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//
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// We add the log page size to the current log offset.
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//
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LfsTruncateOffsetToLogPage( Lfcb, CurrentLogPageOffset, &CurrentLogPageOffset );
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*NextLogPageOffset = CurrentLogPageOffset + Lfcb->LogPageSize; //**** xxAdd( CurrentLogPageOffset, Lfcb->LogPageSize );
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//
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// If the result is larger than the file, we use the first page offset
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// in the file.
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//
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if ( *NextLogPageOffset >= Lfcb->FileSize ) { //**** xxGeq( *NextLogPageOffset, Lfcb->FileSize )
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*NextLogPageOffset = Lfcb->FirstLogPage;
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*Wrapped = TRUE;
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} else {
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*Wrapped = FALSE;
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}
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DebugTrace( 0, Dbg, "NextLogPageOffset (Low) -> %08lx\n", NextLogPageOffset->LowPart );
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DebugTrace( 0, Dbg, "NextLogPageOffset (High) -> %08lx\n", NextLogPageOffset->HighPart );
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DebugTrace( 0, Dbg, "Wrapped -> %08x\n", *Wrapped );
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DebugTrace( -1, Dbg, "LfsNextLogPageOffset: Exit\n", 0 );
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return;
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}
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