498 lines
11 KiB
C
498 lines
11 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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LbcbSup.c
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Abstract:
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This module provides support for manipulating log buffer control blocks.
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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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// The debug trace level
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#define Dbg (DEBUG_TRACE_LBCB_SUP)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, LfsFlushLbcb)
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#pragma alloc_text(PAGE, LfsFlushToLsnPriv)
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#pragma alloc_text(PAGE, LfsGetLbcb)
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#endif
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VOID
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LfsFlushLbcb (
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IN PLFCB Lfcb,
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IN PLBCB Lbcb
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)
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/*++
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Routine Description:
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This routine is called to make sure the data within an Lbcb makes it out
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to disk. The Lbcb must either already be in the workque or it must be
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a restart Lbcb.
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Arguments:
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Lfcb - This is the file control block for the log file.
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Lbcb - This is the Lbcb to flush.
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Return Value:
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None.
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--*/
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{
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LSN LastLsn;
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PLSN FlushedLsn;
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PAGED_CODE();
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DebugTrace( +1, Dbg, "LfsFlushLbcb: Entered\n", 0 );
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DebugTrace( 0, Dbg, "Lfcb -> %08lx\n", Lfcb );
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DebugTrace( 0, Dbg, "Lbcb -> %08lx\n", Lbcb );
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LastLsn = Lbcb->LastEndLsn;
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// If this is a restart area we use the restart counter in the
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// Lfcb. Otherwise we can use the LastFlushedLsn value in the
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// Lfcb. This way we can determine that the Lbcb that interests
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// us has made it out to disk.
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if (LfsLbcbIsRestart( Lbcb )) {
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FlushedLsn = &Lfcb->LastFlushedRestartLsn;
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} else {
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FlushedLsn = &Lfcb->LastFlushedLsn;
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}
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// We loop here until the desired Lsn has made it to disk.
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// If we are able to do the I/O, we will perform it.
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do {
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// If we can do the Io, call down to flush the Lfcb.
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if (Lfcb->LfsIoState == LfsNoIoInProgress) {
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LfsFlushLfcb( Lfcb, Lbcb );
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break;
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}
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// Otherwise we release the Lfcb and immediately wait on the event.
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Lfcb->Waiters += 1;
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LfsReleaseLfcb( Lfcb );
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KeWaitForSingleObject( &Lfcb->Sync->Event,
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Executive,
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KernelMode,
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FALSE,
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NULL );
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LfsAcquireLfcb( Lfcb );
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Lfcb->Waiters -= 1;
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} while ( LastLsn.QuadPart > FlushedLsn->QuadPart );
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DebugTrace( -1, Dbg, "LfsFlushLbcb: Exit\n", 0 );
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return;
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}
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VOID
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LfsFlushToLsnPriv (
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IN PLFCB Lfcb,
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IN LSN Lsn
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)
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/*++
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Routine Description:
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This routine is the worker routine which performs the work of flushing
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a particular Lsn to disk. This routine is always called with the
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Lfcb acquired. This routines makes no guarantee about whether the Lfcb
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is acquired on exit.
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Arguments:
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Lfcb - This is the file control block for the log file.
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Lsn - This is the Lsn to flush to disk.
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Return Value:
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None.
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--*/
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{
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BOOLEAN UseLastRecordLbcb = FALSE;
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PLBCB LastRecordLbcb = NULL;
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PAGED_CODE();
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DebugTrace( +1, Dbg, "LfsFlushToLsnPriv: Entered\n", 0 );
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DebugTrace( 0, Dbg, "Lfcb -> %08lx\n", Lfcb );
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DebugTrace( 0, Dbg, "Lsn (Low) -> %08lx\n", Lsn.LowPart );
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DebugTrace( 0, Dbg, "Lsn (High) -> %08lx\n", Lsn.HighPart );
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// We check if the Lsn is in the valid range. Raising an
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// exception if not.
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if (Lsn.QuadPart > Lfcb->RestartArea->CurrentLsn.QuadPart) {
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UseLastRecordLbcb = TRUE;
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}
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// If the Lsn has already been flushed we are done.
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// Otherwise we need to look through the workqueues and the
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// active queue.
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if (Lsn.QuadPart > Lfcb->LastFlushedLsn.QuadPart) {
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PLIST_ENTRY ThisEntry;
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PLBCB ThisLbcb;
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// Check the workqueue first. We are looking for the last
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// buffer block of a log page block which contains this
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// Lsn.
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ThisEntry = Lfcb->LbcbWorkque.Flink;
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// We keep looping.
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while (TRUE) {
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ThisLbcb = CONTAINING_RECORD( ThisEntry,
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LBCB,
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WorkqueLinks );
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// We pass over any restart areas. We also skip any
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// Lbcb's which do not contain the end of a log record.
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if (!LfsLbcbIsRestart( ThisLbcb )
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&& FlagOn( ThisLbcb->Flags, LOG_PAGE_LOG_RECORD_END )) {
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LastRecordLbcb = ThisLbcb;
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// If the last complete Lsn in this Lbcb is greater or equal
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// to the desired Lsn, we exit the loop.
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if (ThisLbcb->LastEndLsn.QuadPart >= Lsn.QuadPart) {
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break;
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}
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}
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// Otherwise move to the next Lbcb.
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ThisEntry = ThisEntry->Flink;
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// If we have reached the end of the list then break out. We
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// were given an Lsn which is larger than any flushed Lsn so
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// we will just flush to the end of the log file.
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if (ThisEntry == &Lfcb->LbcbWorkque) {
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if (UseLastRecordLbcb) {
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ThisLbcb = LastRecordLbcb;
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}
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break;
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}
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}
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if (ThisLbcb != NULL) {
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// If we are not supporting a packed log file and this Lbcb is from
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// the active queue, we need to check that losing the tail of the
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// will not swallow up any of our reserved space.
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if (!FlagOn( Lfcb->Flags, LFCB_PACK_LOG )
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&& FlagOn( ThisLbcb->LbcbFlags, LBCB_ON_ACTIVE_QUEUE )) {
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LONGLONG CurrentAvail;
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LONGLONG UnusedBytes;
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// Find the unused bytes.
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UnusedBytes = 0;
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LfsCurrentAvailSpace( Lfcb,
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&CurrentAvail,
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(PULONG)&UnusedBytes );
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CurrentAvail = CurrentAvail - Lfcb->TotalUndoCommitment;
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if (UnusedBytes > CurrentAvail) {
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DebugTrace( -1, Dbg, "Have to preserve these bytes for possible aborts\n", 0 );
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ExRaiseStatus( STATUS_LOG_FILE_FULL );
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}
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// We want to make sure we don't write any more data into this
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// page. Remove this from the active queue.
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RemoveEntryList( &ThisLbcb->ActiveLinks );
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ClearFlag( ThisLbcb->LbcbFlags, LBCB_ON_ACTIVE_QUEUE );
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}
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// We now have the Lbcb we want to flush to disk.
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LfsFlushLbcb( Lfcb, ThisLbcb );
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}
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}
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DebugTrace( -1, Dbg, "LfsFlushToLsnPriv: Exit\n", 0 );
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return;
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}
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PLBCB
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LfsGetLbcb (
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IN PLFCB Lfcb
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)
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/*++
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Routine Description:
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This routine is called to add a Lbcb to the active queue.
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Arguments:
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Lfcb - This is the file control block for the log file.
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Return Value:
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PLBCB - Pointer to the Lbcb allocated.
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--*/
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{
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PLBCB Lbcb = NULL;
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PVOID PageHeader;
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PBCB PageHeaderBcb = NULL;
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BOOLEAN WrappedOrUsaError;
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PAGED_CODE();
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DebugTrace( +1, Dbg, "LfsGetLbcb: Entered\n", 0 );
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DebugTrace( 0, Dbg, "Lfcb -> %08lx\n", Lfcb );
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// Use a try-finally to facilitate cleanup.
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try {
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// Pin the desired record page.
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LfsPreparePinWriteData( Lfcb,
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Lfcb->NextLogPage,
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(ULONG)Lfcb->LogPageSize,
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&PageHeader,
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&PageHeaderBcb );
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// Put our signature into the page so we won't fail if we
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// see a previous 'BAAD' signature.
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*((PULONG) PageHeader) = LFS_SIGNATURE_RECORD_PAGE_ULONG;
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// Now allocate an Lbcb.
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LfsAllocateLbcb( Lfcb, &Lbcb );
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// If we are at the beginning of the file we test that the
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// sequence number won't wrap to 0.
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if (!FlagOn( Lfcb->Flags, LFCB_NO_LAST_LSN | LFCB_REUSE_TAIL )
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&& ( Lfcb->NextLogPage == Lfcb->FirstLogPage )) {
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Lfcb->SeqNumber = Lfcb->SeqNumber + 1;
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// If the sequence number is going from 0 to 1, then
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// this is the first time the log file has wrapped. We want
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// to remember this because it means that we can now do
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// large spiral writes.
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if (Int64ShllMod32( Lfcb->SeqNumber, Lfcb->FileDataBits ) == 0) {
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DebugTrace( 0, Dbg, "Log sequence number about to wrap: Lfcb -> %08lx\n", Lfcb );
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KeBugCheck( FILE_SYSTEM );
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}
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// If this number is greater or equal to the wrap sequence number in
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// the Lfcb, set the wrap flag in the Lbcb.
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if (!FlagOn( Lfcb->Flags, LFCB_LOG_WRAPPED )
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&& ( Lfcb->SeqNumber >= Lfcb->SeqNumberForWrap )) {
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SetFlag( Lbcb->LbcbFlags, LBCB_LOG_WRAPPED );
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SetFlag( Lfcb->Flags, LFCB_LOG_WRAPPED );
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}
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}
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// Now initialize the rest of the Lbcb fields.
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Lbcb->FileOffset = Lfcb->NextLogPage;
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Lbcb->SeqNumber = Lfcb->SeqNumber;
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Lbcb->BufferOffset = Lfcb->LogPageDataOffset;
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// Store the next page in the Lfcb.
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LfsNextLogPageOffset( Lfcb,
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Lfcb->NextLogPage,
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&Lfcb->NextLogPage,
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&WrappedOrUsaError );
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Lbcb->Length = Lfcb->LogPageSize;
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Lbcb->PageHeader = PageHeader;
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Lbcb->LogPageBcb = PageHeaderBcb;
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Lbcb->ResourceThread = ExGetCurrentResourceThread();
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Lbcb->ResourceThread = (ERESOURCE_THREAD) ((ULONG) Lbcb->ResourceThread | 3);
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// If we are reusing a previous page then set a flag in
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// the Lbcb to indicate that we should flush a copy
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// first.
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if (FlagOn( Lfcb->Flags, LFCB_REUSE_TAIL )) {
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SetFlag( Lbcb->LbcbFlags, LBCB_FLUSH_COPY );
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ClearFlag( Lfcb->Flags, LFCB_REUSE_TAIL );
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(ULONG)Lbcb->BufferOffset = Lfcb->ReusePageOffset;
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Lbcb->Flags = ((PLFS_RECORD_PAGE_HEADER) PageHeader)->Flags;
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Lbcb->LastLsn = ((PLFS_RECORD_PAGE_HEADER) PageHeader)->Copy.LastLsn;
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Lbcb->LastEndLsn = ((PLFS_RECORD_PAGE_HEADER) PageHeader)->Header.Packed.LastEndLsn;
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}
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// Put the Lbcb on the active queue
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InsertTailList( &Lfcb->LbcbActive, &Lbcb->ActiveLinks );
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SetFlag( Lbcb->LbcbFlags, LBCB_ON_ACTIVE_QUEUE );
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// Now that we have succeeded, set the owner thread to Thread + 1 so the resource
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// package will know not to peek in this thread. It may be deallocated before
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// we release the Bcb during flush.
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CcSetBcbOwnerPointer( Lbcb->LogPageBcb, (PVOID) Lbcb->ResourceThread );
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} finally {
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DebugUnwind( LfsGetLbcb );
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// If an error occurred, we need to clean up any blocks which
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// have not been added to the active queue.
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if (AbnormalTermination()) {
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if (Lbcb != NULL) {
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LfsDeallocateLbcb( Lfcb, Lbcb );
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Lbcb = NULL;
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}
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// Unpin the system page if pinned.
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if (PageHeaderBcb != NULL) {
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CcUnpinData( PageHeaderBcb );
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}
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}
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DebugTrace( -1, Dbg, "LfsGetLbcb: Exit\n", 0 );
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}
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return Lbcb;
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}
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