1680 lines
48 KiB
C
1680 lines
48 KiB
C
/*++
|
||
|
||
Copyright (c) 1996-2000 Microsoft Corporation
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|
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Module Name:
|
||
|
||
AllocSup.c
|
||
|
||
Abstract:
|
||
|
||
This module implements mappings to physical blocks on UDF media. The basic
|
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structure used here is the Pcb, which contains lookup information for each
|
||
partition reference in the volume.
|
||
|
||
// @@BEGIN_DDKSPLIT
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|
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Author:
|
||
|
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Dan Lovinger [DanLo] 5-Sep-1996
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|
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Revision History:
|
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|
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Tom Jolly [TomJolly] 21-Jan-2000 CcPurge and append at vmcb end
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Tom Jolly [TomJolly] 1-March-2000 UDF 2.01 support
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// @@END_DDKSPLIT
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--*/
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#include "UdfProcs.h"
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|
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//
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// The Bug check file id for this module
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//
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#define BugCheckFileId (UDFS_BUG_CHECK_ALLOCSUP)
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//
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// The local debug trace level
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//
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#define Dbg (UDFS_DEBUG_LEVEL_ALLOCSUP)
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//
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// Local support routines.
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//
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PPCB
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UdfCreatePcb (
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IN ULONG NumberOfPartitions
|
||
);
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NTSTATUS
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UdfLoadSparingTables(
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PIRP_CONTEXT IrpContext,
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PVCB Vcb,
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PPCB Pcb,
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ULONG Reference
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||
);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, UdfAddToPcb)
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#pragma alloc_text(PAGE, UdfCompletePcb)
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#pragma alloc_text(PAGE, UdfCreatePcb)
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#pragma alloc_text(PAGE, UdfDeletePcb)
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#pragma alloc_text(PAGE, UdfEquivalentPcb)
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#pragma alloc_text(PAGE, UdfInitializePcb)
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#pragma alloc_text(PAGE, UdfLookupAllocation)
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#pragma alloc_text(PAGE, UdfLookupMetaVsnOfExtent)
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#pragma alloc_text(PAGE, UdfLookupPsnOfExtent)
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#endif
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BOOLEAN
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UdfLookupAllocation (
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IN PIRP_CONTEXT IrpContext,
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IN PFCB Fcb,
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IN PCCB Ccb,
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IN LONGLONG FileOffset,
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OUT PLONGLONG DiskOffset,
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OUT PULONG ByteCount
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||
)
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/*++
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Routine Description:
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This routine looks through the mapping information for the file
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to find the logical diskoffset and number of bytes at that offset.
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This routine assumes we are looking up a valid range in the file. If
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a mapping does not exist,
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Arguments:
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Fcb - Fcb representing this stream.
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FileOffset - Lookup the allocation beginning at this point.
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DiskOffset - Address to store the logical disk offset.
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ByteCount - Address to store the number of contiguous bytes beginning
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at DiskOffset above.
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Return Value:
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BOOLEAN - whether the extent is unrecorded data
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--*/
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{
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PVCB Vcb;
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BOOLEAN Recorded = TRUE;
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BOOLEAN Result;
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LARGE_INTEGER LocalPsn;
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LARGE_INTEGER LocalSectorCount;
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PAGED_CODE();
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//
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// Check inputs
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//
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ASSERT_IRP_CONTEXT( IrpContext );
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ASSERT_FCB( Fcb );
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//
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// We will never be looking up the allocations of embedded objects.
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//
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ASSERT( !FlagOn( Fcb->FcbState, FCB_STATE_EMBEDDED_DATA ));
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Vcb = Fcb->Vcb;
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LocalPsn.QuadPart = LocalSectorCount.QuadPart = 0;
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//
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// Lookup the entry containing this file offset.
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//
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if (FlagOn( Fcb->FcbState, FCB_STATE_VMCB_MAPPING )) {
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//
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// Map this offset into the metadata stream.
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//
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ASSERT( SectorOffset( Vcb, FileOffset ) == 0 );
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Result = UdfVmcbVbnToLbn( &Vcb->Vmcb,
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SectorsFromBytes( Vcb, FileOffset ),
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&LocalPsn.LowPart,
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&LocalSectorCount.LowPart );
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} else {
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//
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// Map this offset in a regular stream.
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//
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ASSERT( FlagOn( Fcb->FcbState, FCB_STATE_MCB_INITIALIZED ));
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Result = FsRtlLookupLargeMcbEntry( &Fcb->Mcb,
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LlSectorsFromBytes( Vcb, FileOffset ),
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&LocalPsn.QuadPart,
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&LocalSectorCount.QuadPart,
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NULL,
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NULL,
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NULL );
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}
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//
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// If within the Mcb then we use the data out of this entry and are nearly done.
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//
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if (Result) {
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if ( LocalPsn.QuadPart == -1 ) {
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//
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// Regular files can have holey allocations which represent unrecorded extents. For
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// such extents which are sandwiched in between recorded extents of the file, the Mcb
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// package tells us that it found a valid mapping but that it doesn't correspond to
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// any extents on the media yet. In this case, simply fake the disk offset. The
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// returned sector count is accurate.
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//
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*DiskOffset = 0;
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Recorded = FALSE;
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} else {
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//
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// Now mimic the effects of physical sector sparing. This may shrink the size of the
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// returned run if sparing interrupted the extent on disc.
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//
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ASSERT( LocalPsn.HighPart == 0 );
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if (Vcb->Pcb->SparingMcb) {
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LONGLONG SparingPsn;
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LONGLONG SparingSectorCount;
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if (FsRtlLookupLargeMcbEntry( Vcb->Pcb->SparingMcb,
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LocalPsn.LowPart,
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&SparingPsn,
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&SparingSectorCount,
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NULL,
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NULL,
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NULL )) {
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//
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// Only emit noise if we will really change anything as a result
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// of the sparing table.
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//
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if (SparingPsn != -1 ||
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SparingSectorCount < LocalSectorCount.QuadPart) {
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DebugTrace(( 0, Dbg, "UdfLookupAllocation, spared [%x, +%x) onto [%x, +%x)\n",
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LocalPsn.LowPart,
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LocalSectorCount.LowPart,
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(ULONG) SparingPsn,
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(ULONG) SparingSectorCount ));
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}
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//
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// If we did not land in a hole, map the sector.
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//
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if (SparingPsn != -1) {
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LocalPsn.QuadPart = SparingPsn;
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}
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//
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// The returned sector count now reduces the previous sector count.
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// If we landed in a hole, this indicates that the trailing edge of
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// the extent is spared, if not this indicates that the leading
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// edge is spared.
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//
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if (SparingSectorCount < LocalSectorCount.QuadPart) {
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LocalSectorCount.QuadPart = SparingSectorCount;
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}
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}
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}
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*DiskOffset = LlBytesFromSectors( Vcb, LocalPsn.QuadPart ) + SectorOffset( Vcb, FileOffset );
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//
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// Now we can apply method 2 fixups, which will again interrupt the size of the extent.
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//
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if (FlagOn( Vcb->VcbState, VCB_STATE_METHOD_2_FIXUP )) {
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LARGE_INTEGER SectorsToRunout;
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SectorsToRunout.QuadPart= UdfMethod2NextRunoutInSectors( Vcb, *DiskOffset );
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if (SectorsToRunout.QuadPart < LocalSectorCount.QuadPart) {
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LocalSectorCount.QuadPart = SectorsToRunout.QuadPart;
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}
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*DiskOffset = UdfMethod2TransformByteOffset( Vcb, *DiskOffset );
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}
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}
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} else {
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//
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// We know that prior to this call the system has restricted IO to points within the
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// the file data. Since we failed to find a mapping this is an unrecorded extent at
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// the end of the file, so just conjure up a proper representation.
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//
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if ((Ccb != NULL) && FlagOn( Ccb->Flags, CCB_FLAG_ALLOW_EXTENDED_DASD_IO )) {
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LocalSectorCount.QuadPart = LlSectorsFromBytes( Vcb, ByteCount );
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*DiskOffset = FileOffset;
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Recorded = TRUE;
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} else {
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ASSERT( FileOffset < Fcb->FileSize.QuadPart );
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LocalSectorCount.QuadPart = LlSectorsFromBytes( Vcb, Fcb->FileSize.QuadPart ) -
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LlSectorsFromBytes( Vcb, FileOffset ) +
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1;
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*DiskOffset = 0;
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Recorded = FALSE;
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}
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}
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//
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// Restrict to MAXULONG bytes of allocation
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//
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||
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if (LocalSectorCount.QuadPart > SectorsFromBytes( Vcb, MAXULONG )) {
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*ByteCount = MAXULONG;
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} else {
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*ByteCount = BytesFromSectors( Vcb, LocalSectorCount.LowPart );
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}
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*ByteCount -= SectorOffset( Vcb, FileOffset );
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return Recorded;
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}
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VOID
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UdfDeletePcb (
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IN PPCB Pcb
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||
)
|
||
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||
/*++
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||
|
||
Routine Description:
|
||
|
||
This routine deallocates a Pcb and all ancilliary structures.
|
||
|
||
Arguments:
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||
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Pcb - Pcb being deleted
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||
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Return Value:
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||
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None
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--*/
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||
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{
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PPARTITION Partition;
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if (Pcb->SparingMcb) {
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FsRtlUninitializeLargeMcb( Pcb->SparingMcb );
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UdfFreePool( &Pcb->SparingMcb );
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}
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||
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for (Partition = Pcb->Partition;
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Partition < &Pcb->Partition[Pcb->Partitions];
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Partition++) {
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||
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switch (Partition->Type) {
|
||
|
||
case Physical:
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UdfFreePool( &Partition->Physical.PartitionDescriptor );
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UdfFreePool( &Partition->Physical.SparingMap );
|
||
|
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break;
|
||
|
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case Virtual:
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case Uninitialized:
|
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break;
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||
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||
default:
|
||
|
||
ASSERT( FALSE );
|
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break;
|
||
}
|
||
}
|
||
|
||
ExFreePool( Pcb );
|
||
}
|
||
|
||
|
||
NTSTATUS
|
||
UdfInitializePcb (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb,
|
||
IN OUT PPCB *Pcb,
|
||
IN PNSR_LVOL LVD
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine walks through the partition map of a Logical Volume Descriptor
|
||
and builds an intializing Pcb from it. The Pcb will be ready to be used
|
||
in searching for the partition descriptors of a volume.
|
||
|
||
Arguments:
|
||
|
||
Vcb - The volume this Pcb will pertain to
|
||
|
||
Pcb - Caller's pointer to the Pcb
|
||
|
||
LVD - The Logical Volume Descriptor being used
|
||
|
||
Return Value:
|
||
|
||
STATUS_SUCCESS if the partition map is good and the Pcb is built
|
||
|
||
STATUS_DISK_CORRUPT_ERROR if corrupt maps are found
|
||
|
||
STATUS_UNRECOGNIZED_VOLUME if noncompliant maps are found
|
||
|
||
--*/
|
||
|
||
{
|
||
PPARTMAP_UDF_GENERIC Map;
|
||
PPARTITION Partition;
|
||
|
||
BOOLEAN Found;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Check the input parameters
|
||
//
|
||
|
||
ASSERT_OPTIONAL_PCB( *Pcb );
|
||
|
||
DebugTrace(( +1, Dbg,
|
||
"UdfInitializePcb, Lvd %08x\n",
|
||
LVD ));
|
||
|
||
//
|
||
// Delete a pre-existing (partially initialized from a failed
|
||
// crawl of a VDS) Pcb.
|
||
//
|
||
|
||
if (*Pcb != NULL) {
|
||
|
||
UdfDeletePcb( *Pcb );
|
||
*Pcb = NULL;
|
||
}
|
||
|
||
*Pcb = UdfCreatePcb( LVD->MapTableCount );
|
||
|
||
//
|
||
// Walk the table of partition maps intializing the Pcb for the descriptor
|
||
// initialization pass.
|
||
//
|
||
|
||
for (Map = (PPARTMAP_UDF_GENERIC) LVD->MapTable,
|
||
Partition = (*Pcb)->Partition;
|
||
|
||
Partition < &(*Pcb)->Partition[(*Pcb)->Partitions];
|
||
|
||
Map = Add2Ptr( Map, Map->Length, PPARTMAP_UDF_GENERIC ),
|
||
Partition++) {
|
||
|
||
//
|
||
// Now check that this LVD can actually contain this map entry. First check that
|
||
// the descriptor can contain the first few fields, then check that it can hold
|
||
// all of the bytes claimed by the descriptor.
|
||
//
|
||
|
||
if (Add2Ptr( Map, sizeof( PARTMAP_GENERIC ), PCHAR ) > Add2Ptr( LVD, ISONsrLvolSize( LVD ), PCHAR ) ||
|
||
Add2Ptr( Map, Map->Length, PCHAR ) > Add2Ptr( LVD, ISONsrLvolSize( LVD ), PCHAR )) {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, map at +%04x beyond Lvd size %04x\n",
|
||
(PCHAR) Map - (PCHAR) LVD,
|
||
ISONsrLvolSize( LVD )));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
//
|
||
// Now load up this map entry.
|
||
//
|
||
|
||
switch (Map->Type) {
|
||
|
||
case PARTMAP_TYPE_PHYSICAL:
|
||
|
||
{
|
||
PPARTMAP_PHYSICAL MapPhysical = (PPARTMAP_PHYSICAL) Map;
|
||
|
||
//
|
||
// Type 1 - Physical Partition
|
||
//
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, map reference %02x is Physical (Partition # %08x)\n",
|
||
(Partition - (*Pcb)->Partition)/sizeof(PARTITION),
|
||
MapPhysical->Partition ));
|
||
|
||
//
|
||
// It must be the case that the volume the partition is on is the first
|
||
// one since we only do single disc UDF. This will have already been
|
||
// checked by the caller.
|
||
//
|
||
|
||
if (MapPhysical->VolSetSeq > 1) {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, ... but physical partition resides on volume set volume # %08x (> 1)!\n",
|
||
MapPhysical->VolSetSeq ));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
SetFlag( (*Pcb)->Flags, PCB_FLAG_PHYSICAL_PARTITION );
|
||
Partition->Type = Physical;
|
||
Partition->Physical.PartitionNumber = MapPhysical->Partition;
|
||
}
|
||
|
||
break;
|
||
|
||
case PARTMAP_TYPE_PROXY:
|
||
|
||
//
|
||
// Type 2 - a Proxy Partition, something not explicitly physical.
|
||
//
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, map reference %02x is a proxy\n",
|
||
(Partition - (*Pcb)->Partition)/sizeof(PARTITION)));
|
||
|
||
//
|
||
// Handle the various types of proxy partitions we recognize
|
||
//
|
||
|
||
if (UdfDomainIdentifierContained( &Map->PartID,
|
||
&UdfVirtualPartitionDomainIdentifier,
|
||
UDF_VERSION_150,
|
||
UDF_VERSION_RECOGNIZED )) {
|
||
|
||
{
|
||
PPARTMAP_VIRTUAL MapVirtual = (PPARTMAP_VIRTUAL) Map;
|
||
|
||
//
|
||
// Only one of these guys can exist, since there can be only one VAT per media surface.
|
||
//
|
||
|
||
if (FlagOn( (*Pcb)->Flags, PCB_FLAG_VIRTUAL_PARTITION )) {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, ... but this is a second virtual partition!?!!\n" ));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_UNCRECOGNIZED_VOLUME\n" ));
|
||
|
||
return STATUS_UNRECOGNIZED_VOLUME;
|
||
}
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, ... Virtual (Partition # %08x)\n",
|
||
MapVirtual->Partition ));
|
||
|
||
SetFlag( (*Pcb)->Flags, PCB_FLAG_VIRTUAL_PARTITION );
|
||
Partition->Type = Virtual;
|
||
|
||
//
|
||
// We will convert the partition number to a partition reference
|
||
// before returning.
|
||
//
|
||
|
||
Partition->Virtual.RelatedReference = MapVirtual->Partition;
|
||
}
|
||
|
||
} else if (UdfDomainIdentifierContained( &Map->PartID,
|
||
&UdfSparablePartitionDomainIdentifier,
|
||
UDF_VERSION_150,
|
||
UDF_VERSION_RECOGNIZED )) {
|
||
|
||
{
|
||
NTSTATUS Status;
|
||
PPARTMAP_SPARABLE MapSparable = (PPARTMAP_SPARABLE) Map;
|
||
|
||
//
|
||
// It must be the case that the volume the partition is on is the first
|
||
// one since we only do single disc UDF. This will have already been
|
||
// checked by the caller.
|
||
//
|
||
|
||
if (MapSparable->VolSetSeq > 1) {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, ... but sparable partition resides on volume set volume # %08x (> 1)!\n",
|
||
MapSparable->VolSetSeq ));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, ... Sparable (Partition # %08x)\n",
|
||
MapSparable->Partition ));
|
||
|
||
//
|
||
// We pretend that sparable partitions are basically the same as
|
||
// physical partitions. Since we are not r/w (and will never be
|
||
// on media that requires host-based sparing in any case), this
|
||
// is a good simplification.
|
||
//
|
||
|
||
SetFlag( (*Pcb)->Flags, PCB_FLAG_SPARABLE_PARTITION );
|
||
Partition->Type = Physical;
|
||
Partition->Physical.PartitionNumber = MapSparable->Partition;
|
||
|
||
//
|
||
// Save this map for use when the partition descriptor is found.
|
||
// We can't load the sparing table at this time because we have
|
||
// to turn the Lbn->Psn mapping into a Psn->Psn mapping. UDF
|
||
// believes that the way sparing will be used in concert with
|
||
// the Lbn->Psn mapping engine (like UdfLookupPsnOfExtent).
|
||
//
|
||
// Unfortunately, this would be a bit painful at this time.
|
||
// The users of UdfLookupPsnOfExtent would need to iterate
|
||
// over a new interface (not so bad) but the Vmcb package
|
||
// would need to be turned inside out so that it didn't do
|
||
// the page-filling alignment of blocks in the metadata
|
||
// stream - instead, UdfLookupMetaVsnOfExtent would need to
|
||
// do this itself. I choose to lay the sparing engine into
|
||
// the read path and raw sector read engine instead.
|
||
//
|
||
|
||
Partition->Physical.SparingMap = FsRtlAllocatePoolWithTag( PagedPool,
|
||
sizeof(PARTMAP_SPARABLE),
|
||
TAG_NSR_FSD);
|
||
RtlCopyMemory( Partition->Physical.SparingMap,
|
||
MapSparable,
|
||
sizeof(PARTMAP_SPARABLE));
|
||
}
|
||
|
||
} else {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, ... but we don't recognize this proxy!\n" ));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_UNRECOGNIZED_VOLUME\n" ));
|
||
|
||
return STATUS_UNRECOGNIZED_VOLUME;
|
||
}
|
||
|
||
break;
|
||
|
||
default:
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, map reference %02x is of unknown type %02x\n",
|
||
Map->Type ));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_UNRECOGNIZED_VOLUME\n" ));
|
||
|
||
return STATUS_UNRECOGNIZED_VOLUME;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!FlagOn( (*Pcb)->Flags, PCB_FLAG_PHYSICAL_PARTITION | PCB_FLAG_SPARABLE_PARTITION )) {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfInitializePcb, no physical partition seen on this logical volume!\n" ));
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_UNRECOGNIZED_VOLUME\n" ));
|
||
|
||
return STATUS_UNRECOGNIZED_VOLUME;
|
||
}
|
||
|
||
if (FlagOn( (*Pcb)->Flags, PCB_FLAG_VIRTUAL_PARTITION )) {
|
||
|
||
PPARTITION Host;
|
||
|
||
//
|
||
// Confirm the validity of any type 2 virtual maps on this volume
|
||
// and convert partition numbers to partition references that will
|
||
// immediately index an element of the Pcb.
|
||
//
|
||
|
||
for (Partition = (*Pcb)->Partition;
|
||
Partition < &(*Pcb)->Partition[(*Pcb)->Partitions];
|
||
Partition++) {
|
||
|
||
if (Partition->Type == Virtual) {
|
||
|
||
//
|
||
// Go find the partition this thing is talking about
|
||
//
|
||
|
||
Found = FALSE;
|
||
|
||
for (Host = (*Pcb)->Partition;
|
||
Host < &(*Pcb)->Partition[(*Pcb)->Partitions];
|
||
Host++) {
|
||
|
||
if (Host->Type == Physical &&
|
||
Host->Physical.PartitionNumber ==
|
||
Partition->Virtual.RelatedReference) {
|
||
|
||
Partition->Virtual.RelatedReference =
|
||
(USHORT)(Host - (*Pcb)->Partition)/sizeof(PARTITION);
|
||
Found = TRUE;
|
||
break;
|
||
}
|
||
}
|
||
|
||
//
|
||
// Failure to find a physical partition for this virtual guy
|
||
// is not a good sign.
|
||
//
|
||
|
||
if (!Found) {
|
||
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfInitializePcb -> STATUS_SUCCESS\n" ));
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
|
||
VOID
|
||
UdfAddToPcb (
|
||
IN PPCB Pcb,
|
||
IN PNSR_PART PartitionDescriptor
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine possibly adds a partition descriptor into a Pcb if it
|
||
turns out to be of higher precendence than a descriptor already
|
||
present. Used in building a Pcb already initialized in preperation
|
||
for UdfCompletePcb.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Vcb of the volume the Pcb describes
|
||
|
||
Pcb - Pcb being filled in
|
||
|
||
Return Value:
|
||
|
||
None. An old partition descriptor may be returned in the input field.
|
||
|
||
--*/
|
||
|
||
{
|
||
USHORT Reference;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Check inputs
|
||
//
|
||
|
||
ASSERT_PCB( Pcb );
|
||
ASSERT( PartitionDescriptor );
|
||
|
||
for (Reference = 0;
|
||
Reference < Pcb->Partitions;
|
||
Reference++) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfAddToPcb, considering partition reference %d (type %d)\n", (ULONG)Reference, Pcb->Partition[Reference].Type));
|
||
|
||
switch (Pcb->Partition[Reference].Type) {
|
||
|
||
case Physical:
|
||
|
||
//
|
||
// Now possibly store this descriptor in the Pcb if it is
|
||
// the partition number for this partition reference.
|
||
//
|
||
|
||
if (Pcb->Partition[Reference].Physical.PartitionNumber == PartitionDescriptor->Number) {
|
||
|
||
//
|
||
// It seems to be legal (if questionable) for multiple partition maps to reference
|
||
// the same partition descriptor. So we make a copy of the descriptor for each
|
||
// referencing partitionmap to make life easier when it comes to freeing it.
|
||
//
|
||
|
||
UdfStoreVolumeDescriptorIfPrevailing( (PNSR_VD_GENERIC *) &Pcb->Partition[Reference].Physical.PartitionDescriptor,
|
||
(PNSR_VD_GENERIC) PartitionDescriptor );
|
||
}
|
||
|
||
break;
|
||
|
||
case Virtual:
|
||
break;
|
||
|
||
default:
|
||
|
||
ASSERT(FALSE);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
NTSTATUS
|
||
UdfCompletePcb (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb,
|
||
IN PPCB Pcb
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine completes initialization of a Pcb which has been filled
|
||
in with partition descriptors. Initialization-time data such as the
|
||
physical partition descriptors will be returned to the system.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Vcb of the volume the Pcb describes
|
||
|
||
Pcb - Pcb being completed
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS according to whether intialization completion was succesful
|
||
|
||
--*/
|
||
|
||
{
|
||
ULONG Reference;
|
||
|
||
NTSTATUS Status;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Check inputs
|
||
//
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
ASSERT_VCB( Vcb );
|
||
ASSERT_PCB( Pcb );
|
||
|
||
DebugTrace(( +1, Dbg, "UdfCompletePcb, Vcb %08x Pcb %08x\n", Vcb, Pcb ));
|
||
|
||
//
|
||
// Complete intialization all physical partitions
|
||
//
|
||
|
||
for (Reference = 0;
|
||
Reference < Pcb->Partitions;
|
||
Reference++) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfCompletePcb, Examining Ref %u (type %u)!\n", Reference, Pcb->Partition[Reference].Type));
|
||
|
||
switch (Pcb->Partition[Reference].Type) {
|
||
|
||
case Physical:
|
||
|
||
if (Pcb->Partition[Reference].Physical.PartitionDescriptor == NULL) {
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfCompletePcb, ... but didn't find Partition# %u!\n",
|
||
Pcb->Partition[Reference].Physical.PartitionNumber ));
|
||
|
||
DebugTrace(( -1, Dbg, "UdfCompletePcb -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
Pcb->Partition[Reference].Physical.Start =
|
||
Pcb->Partition[Reference].Physical.PartitionDescriptor->Start;
|
||
Pcb->Partition[Reference].Physical.Length =
|
||
Pcb->Partition[Reference].Physical.PartitionDescriptor->Length;
|
||
|
||
|
||
//
|
||
// Retrieve the sparing information at this point if appropriate.
|
||
// We have to do this when we can map logical -> physical blocks.
|
||
//
|
||
|
||
if (Pcb->Partition[Reference].Physical.SparingMap) {
|
||
|
||
Status = UdfLoadSparingTables( IrpContext,
|
||
Vcb,
|
||
Pcb,
|
||
Reference );
|
||
|
||
if (!NT_SUCCESS( Status )) {
|
||
|
||
DebugTrace(( -1, Dbg,
|
||
"UdfCompletePcb -> %08x\n", Status ));
|
||
return Status;
|
||
}
|
||
}
|
||
|
||
DebugTrace(( 0, Dbg, "Start Psn: 0x%X, sectors: 0x%x\n",
|
||
Pcb->Partition[Reference].Physical.Start,
|
||
Pcb->Partition[Reference].Physical.Length));
|
||
|
||
//
|
||
// We will not need the descriptor or sparing map anymore, so drop them.
|
||
//
|
||
|
||
UdfFreePool( &Pcb->Partition[Reference].Physical.PartitionDescriptor );
|
||
UdfFreePool( &Pcb->Partition[Reference].Physical.SparingMap );
|
||
break;
|
||
|
||
case Virtual:
|
||
break;
|
||
|
||
default:
|
||
|
||
ASSERT(FALSE);
|
||
break;
|
||
}
|
||
}
|
||
|
||
DebugTrace(( -1, Dbg, "UdfCompletePcb -> STATUS_SUCCESS\n" ));
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
|
||
BOOLEAN
|
||
UdfEquivalentPcb (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PPCB Pcb1,
|
||
IN PPCB Pcb2
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine compares two completed Pcbs to see if they appear equivalent.
|
||
|
||
Arguments:
|
||
|
||
Pcb1 - Pcb being compared
|
||
|
||
Pcb2 - Pcb being compared
|
||
|
||
Return Value:
|
||
|
||
BOOLEAN according to whether they are equivalent (TRUE, else FALSE)
|
||
|
||
--*/
|
||
|
||
{
|
||
ULONG Index;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Check input.
|
||
//
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
|
||
if (Pcb1->Partitions != Pcb2->Partitions) {
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
for (Index = 0;
|
||
Index < Pcb1->Partitions;
|
||
Index++) {
|
||
|
||
//
|
||
// First check that the partitions are of the same type.
|
||
//
|
||
|
||
if (Pcb1->Partition[Index].Type != Pcb2->Partition[Index].Type) {
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
//
|
||
// Now the map content must be the same ...
|
||
//
|
||
|
||
switch (Pcb1->Partition[Index].Type) {
|
||
|
||
case Physical:
|
||
|
||
if (Pcb1->Partition[Index].Physical.PartitionNumber != Pcb2->Partition[Index].Physical.PartitionNumber ||
|
||
Pcb1->Partition[Index].Physical.Length != Pcb2->Partition[Index].Physical.Length ||
|
||
Pcb1->Partition[Index].Physical.Start != Pcb2->Partition[Index].Physical.Start) {
|
||
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case Virtual:
|
||
|
||
if (Pcb1->Partition[Index].Virtual.RelatedReference != Pcb2->Partition[Index].Virtual.RelatedReference) {
|
||
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
|
||
ASSERT( FALSE);
|
||
return FALSE;
|
||
break;
|
||
}
|
||
}
|
||
|
||
//
|
||
// All map elements were equivalent.
|
||
//
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
ULONG
|
||
UdfLookupPsnOfExtent (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb,
|
||
IN USHORT Reference,
|
||
IN ULONG Lbn,
|
||
IN ULONG Len
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine maps the input logical block extent on a given partition to
|
||
a starting physical sector. It doubles as a bounds checker - if the routine
|
||
does not raise, the caller is guaranteed that the extent lies within the
|
||
partition.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Vcb of logical volume
|
||
|
||
Reference - Partition reference to use in the mapping
|
||
|
||
Lbn - Logical block number
|
||
|
||
Len - Length of extent in bytes
|
||
|
||
Return Value:
|
||
|
||
ULONG physical sector number
|
||
|
||
--*/
|
||
|
||
{
|
||
PPCB Pcb = Vcb->Pcb;
|
||
ULONG Psn;
|
||
|
||
PBCB Bcb;
|
||
LARGE_INTEGER Offset;
|
||
PULONG MappedLbn;
|
||
|
||
PAGED_CODE();
|
||
|
||
//
|
||
// Check inputs
|
||
//
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
ASSERT_VCB( Vcb );
|
||
ASSERT_PCB( Pcb );
|
||
|
||
DebugTrace(( +1, Dbg, "UdfLookupPsnOfExtent, [%04x/%08x, +%08x)\n", Reference, Lbn, Len ));
|
||
|
||
if (Reference < Pcb->Partitions) {
|
||
|
||
while (TRUE) {
|
||
|
||
switch (Pcb->Partition[Reference].Type) {
|
||
|
||
case Physical:
|
||
|
||
//
|
||
// Check that the input extent lies inside the partition. Calculate the
|
||
// Lbn of the last block and see that it is interior.
|
||
//
|
||
|
||
if (SectorsFromBlocks( Vcb, Lbn ) + SectorsFromBytes( Vcb, Len ) >
|
||
Pcb->Partition[Reference].Physical.Length) {
|
||
|
||
goto NoGood;
|
||
}
|
||
|
||
Psn = Pcb->Partition[Reference].Physical.Start + SectorsFromBlocks( Vcb, Lbn );
|
||
|
||
DebugTrace(( -1, Dbg, "UdfLookupPsnOfExtent -> %08x\n", Psn ));
|
||
return Psn;
|
||
|
||
case Virtual:
|
||
|
||
//
|
||
// Bounds check. Per UDF 2.00 2.3.10 and implied in UDF 1.50, virtual
|
||
// extent lengths cannot be greater than one block in size. Lbn must also
|
||
// fall within the VAT!
|
||
//
|
||
|
||
if ((Lbn >= Vcb->VATEntryCount) || (Len > BlockSize( Vcb ))) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLookupPsnOfExtent() - Either Lbn (0x%x) > VatLbns (0x%X), or len (0x%x) > blocksize (0x%x)\n", Lbn, Vcb->VATEntryCount, Len, BlockSize(Vcb)));
|
||
goto NoGood;
|
||
}
|
||
|
||
try {
|
||
|
||
Bcb = NULL;
|
||
|
||
//
|
||
// Calculate the location of the mapping element in the VAT
|
||
// and retrieve. Bias by the size of the VAT header, if any.
|
||
//
|
||
|
||
Offset.QuadPart = Vcb->OffsetToFirstVATEntry + Lbn * sizeof(ULONG);
|
||
|
||
CcMapData( Vcb->VatFcb->FileObject,
|
||
&Offset,
|
||
sizeof(ULONG),
|
||
TRUE,
|
||
&Bcb,
|
||
&MappedLbn );
|
||
|
||
//
|
||
// Now rewrite the inputs in terms of the virtual mapping. We
|
||
// will reloop to perform the logical -> physical mapping.
|
||
//
|
||
|
||
DebugTrace(( 0, Dbg,
|
||
"UdfLookupPsnOfExtent, Mapping V %04x/%08x -> L %04x/%08x\n",
|
||
Reference,
|
||
Lbn,
|
||
Pcb->Partition[Reference].Virtual.RelatedReference,
|
||
*MappedLbn ));
|
||
|
||
Lbn = *MappedLbn;
|
||
Reference = Pcb->Partition[Reference].Virtual.RelatedReference;
|
||
|
||
} finally {
|
||
|
||
DebugUnwind( UdfLookupPsnOfExtent );
|
||
|
||
UdfUnpinData( IrpContext, &Bcb );
|
||
}
|
||
|
||
//
|
||
// An Lbn of ~0 in the VAT is defined to indicate that the sector is unused,
|
||
// so we should never see such a thing.
|
||
//
|
||
|
||
if (Lbn == ~0) {
|
||
|
||
goto NoGood;
|
||
}
|
||
|
||
break;
|
||
|
||
default:
|
||
|
||
ASSERT(FALSE);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
NoGood:
|
||
|
||
//
|
||
// Some people have misinterpreted a partition number to equal a
|
||
// partition reference, or perhaps this is just corrupt media.
|
||
//
|
||
|
||
UdfRaiseStatus( IrpContext, STATUS_FILE_CORRUPT_ERROR );
|
||
}
|
||
|
||
|
||
ULONG
|
||
UdfLookupMetaVsnOfExtent (
|
||
IN PIRP_CONTEXT IrpContext,
|
||
IN PVCB Vcb,
|
||
IN USHORT Reference,
|
||
IN ULONG Lbn,
|
||
IN ULONG Len,
|
||
IN BOOLEAN ExactEnd
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine maps the input logical block extent on a given partition to
|
||
a starting virtual block in the metadata stream. If a mapping does not
|
||
exist, one will be created and the metadata stream extended.
|
||
|
||
Callers must hold NO mappings into the VMCB stream when calling this
|
||
function.
|
||
|
||
Arguments:
|
||
|
||
Vcb - Vcb of logical volume
|
||
|
||
Reference - Partition reference to use in the mapping
|
||
|
||
Lbn - Logical block number
|
||
|
||
Len - Length of extent in bytes
|
||
|
||
ExactEnd - Indicates the extension policy if these blocks are not mapped.
|
||
|
||
Return Value:
|
||
|
||
ULONG virtual sector number
|
||
|
||
Raised status if the Lbn extent is split across multiple Vbn extents.
|
||
|
||
--*/
|
||
|
||
{
|
||
ULONG Vsn;
|
||
ULONG Psn;
|
||
ULONG SectorCount;
|
||
|
||
BOOLEAN Result;
|
||
|
||
BOOLEAN UnwindExtension = FALSE;
|
||
BOOLEAN UnwindVmcb = FALSE;
|
||
LONGLONG UnwindAllocationSize;
|
||
|
||
PFCB Fcb = NULL;
|
||
|
||
//
|
||
// Check inputs
|
||
//
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
ASSERT_VCB( Vcb );
|
||
|
||
//
|
||
// The extent must be a multiple of blocksize
|
||
//
|
||
|
||
if ((0 == Len) || BlockOffset( Vcb, Len)) {
|
||
|
||
UdfRaiseStatus( IrpContext, STATUS_FILE_CORRUPT_ERROR );
|
||
}
|
||
|
||
//
|
||
// Get the physical mapping of the extent. The Mcb package operates on ULONG/ULONG
|
||
// keys and values so we must render our 48bit address into 32. We can do this since
|
||
// this is a single surface implementation, and it is guaranteed that a surface cannot
|
||
// contain more than MAXULONG physical sectors.
|
||
//
|
||
|
||
Psn = UdfLookupPsnOfExtent( IrpContext,
|
||
Vcb,
|
||
Reference,
|
||
Lbn,
|
||
Len );
|
||
|
||
//
|
||
// Use try-finally for cleanup
|
||
//
|
||
|
||
try {
|
||
|
||
//
|
||
// We must safely establish a mapping and extend the metadata stream so that cached
|
||
// reads can occur on this new extent. This lock was moved out here (rather than just
|
||
// protecting the actual Fcb changes) to protect against mappings being made
|
||
// by other threads between this thread extending the vmcb and calling CcSetFileSizes.
|
||
// this would result in zeroed pages being mapped...
|
||
//
|
||
|
||
Fcb = Vcb->MetadataFcb;
|
||
UdfLockFcb( IrpContext, Fcb );
|
||
|
||
//
|
||
// Add / lookup the mapping. We know that it is being added to the end of the stream.
|
||
//
|
||
|
||
UnwindVmcb = UdfAddVmcbMapping(IrpContext,
|
||
&Vcb->Vmcb,
|
||
Psn,
|
||
SectorsFromBytes( Vcb, Len ),
|
||
ExactEnd,
|
||
&Vsn,
|
||
&SectorCount );
|
||
|
||
ASSERT( SectorCount >= SectorsFromBytes( Vcb, Len));
|
||
|
||
//
|
||
// If this was a new mapping, then we need to extend the Vmcb file size
|
||
//
|
||
|
||
if (UnwindVmcb) {
|
||
|
||
UnwindAllocationSize = Fcb->AllocationSize.QuadPart;
|
||
UnwindExtension = TRUE;
|
||
|
||
Fcb->AllocationSize.QuadPart =
|
||
Fcb->FileSize.QuadPart =
|
||
Fcb->ValidDataLength.QuadPart = LlBytesFromSectors( Vcb, Vsn + SectorCount);
|
||
|
||
CcSetFileSizes( Fcb->FileObject, (PCC_FILE_SIZES) &Fcb->AllocationSize );
|
||
UnwindExtension = FALSE;
|
||
}
|
||
|
||
}
|
||
finally {
|
||
|
||
if (UnwindExtension) {
|
||
|
||
ULONG FirstZappedVsn;
|
||
|
||
//
|
||
// Strip off the additional mappings we made.
|
||
//
|
||
|
||
Fcb->AllocationSize.QuadPart =
|
||
Fcb->FileSize.QuadPart =
|
||
Fcb->ValidDataLength.QuadPart = UnwindAllocationSize;
|
||
|
||
FirstZappedVsn = SectorsFromBytes( Vcb, UnwindAllocationSize );
|
||
|
||
if (UnwindVmcb) {
|
||
|
||
UdfRemoveVmcbMapping( &Vcb->Vmcb,
|
||
FirstZappedVsn,
|
||
Vsn + SectorCount - FirstZappedVsn );
|
||
}
|
||
|
||
CcSetFileSizes( Fcb->FileObject, (PCC_FILE_SIZES) &Fcb->AllocationSize );
|
||
}
|
||
|
||
if (Fcb) { UdfUnlockFcb( IrpContext, Fcb ); }
|
||
}
|
||
|
||
return Vsn;
|
||
}
|
||
|
||
|
||
//
|
||
// Local support routine.
|
||
//
|
||
|
||
PPCB
|
||
UdfCreatePcb (
|
||
IN ULONG NumberOfPartitions
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine creates a new Pcb of the indicated size.
|
||
|
||
Arguments:
|
||
|
||
NumberOfPartitions - Number of partitions this Pcb will describe
|
||
|
||
Return Value:
|
||
|
||
PPCB - the Pcb created
|
||
|
||
--*/
|
||
|
||
{
|
||
PPCB Pcb;
|
||
ULONG Size = sizeof(PCB) + sizeof(PARTITION)*NumberOfPartitions;
|
||
|
||
PAGED_CODE();
|
||
|
||
ASSERT( NumberOfPartitions );
|
||
ASSERT( NumberOfPartitions < MAXUSHORT );
|
||
|
||
Pcb = (PPCB) FsRtlAllocatePoolWithTag( UdfPagedPool,
|
||
Size,
|
||
TAG_PCB );
|
||
|
||
RtlZeroMemory( Pcb, Size );
|
||
|
||
Pcb->NodeTypeCode = UDFS_NTC_PCB;
|
||
Pcb->NodeByteSize = (USHORT) Size;
|
||
|
||
Pcb->Partitions = (USHORT)NumberOfPartitions;
|
||
|
||
return Pcb;
|
||
}
|
||
|
||
|
||
//
|
||
// Internal support routine
|
||
//
|
||
|
||
NTSTATUS
|
||
UdfLoadSparingTables(
|
||
PIRP_CONTEXT IrpContext,
|
||
PVCB Vcb,
|
||
PPCB Pcb,
|
||
ULONG Reference
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine reads the sparing tables for a partition and fills
|
||
in the sparing Mcb.
|
||
|
||
Arguments:
|
||
|
||
Vcb - the volume hosting the spared partition
|
||
|
||
Pcb - the partion block corresponding to the volume
|
||
|
||
Reference - the partition reference being pulled in
|
||
|
||
Return Value:
|
||
|
||
NTSTATUS according to whether the sparing tables were loaded
|
||
|
||
--*/
|
||
|
||
{
|
||
NTSTATUS Status;
|
||
|
||
ULONG SparingTable;
|
||
PULONG SectorBuffer;
|
||
ULONG Psn;
|
||
|
||
ULONG RemainingBytes;
|
||
ULONG ByteOffset;
|
||
ULONG TotalBytes;
|
||
|
||
BOOLEAN Complete;
|
||
|
||
PSPARING_TABLE_HEADER Header;
|
||
PSPARING_TABLE_ENTRY Entry;
|
||
|
||
PPARTITION Partition = &Pcb->Partition[Reference];
|
||
PPARTMAP_SPARABLE Map = Partition->Physical.SparingMap;
|
||
|
||
ASSERT_IRP_CONTEXT( IrpContext );
|
||
ASSERT_VCB( Vcb );
|
||
|
||
ASSERT( Map != NULL );
|
||
|
||
DebugTrace(( +1, Dbg, "UdfLoadSparingTables, Vcb %08x, PcbPartition %08x, Map @ %08x\n", Vcb, Partition, Map ));
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, Map sez: PacketLen %u, NTables %u, TableSize %u\n",
|
||
Map->PacketLength,
|
||
Map->NumSparingTables,
|
||
Map->TableSize));
|
||
|
||
|
||
//
|
||
// Check that the sparale map appears sane. If there are no sparing tables that
|
||
// is pretty OK, and it'll wind up looking like a regular physical partition.
|
||
//
|
||
|
||
if (Map->NumSparingTables == 0) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, no sparing tables claimed!\n" ));
|
||
DebugTrace(( -1, Dbg, "UdfLoadSparingTables -> STATUS_SUCCESS\n" ));
|
||
return STATUS_SUCCESS;
|
||
}
|
||
|
||
if (Map->NumSparingTables > sizeof(Map->TableLocation)/sizeof(ULONG)) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, too many claimed tables to fit! (max %u)\n",
|
||
sizeof(Map->TableLocation)/sizeof(ULONG)));
|
||
DebugTrace(( -1, Dbg, "UdfLoadSparingTables -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
if (Map->PacketLength != UDF_SPARING_PACKET_LENGTH) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, packet size is %u (not %u!\n",
|
||
Map->PacketLength,
|
||
UDF_SPARING_PACKET_LENGTH ));
|
||
DebugTrace(( -1, Dbg, "UdfLoadSparingTables -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
if (Map->TableSize < sizeof(SPARING_TABLE_HEADER) ||
|
||
(Map->TableSize - sizeof(SPARING_TABLE_HEADER)) % sizeof(SPARING_TABLE_ENTRY) != 0) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, sparing table size is too small or unaligned!\n" ));
|
||
DebugTrace(( -1, Dbg, "UdfLoadSparingTables -> STATUS_DISK_CORRUPT_ERROR\n" ));
|
||
return STATUS_DISK_CORRUPT_ERROR;
|
||
}
|
||
|
||
#ifdef UDF_SANITY
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables" ));
|
||
for (SparingTable = 0; SparingTable < Map->NumSparingTables; SparingTable++) {
|
||
|
||
DebugTrace(( 0, Dbg, ", Table %u @ %x", SparingTable, Map->TableLocation[SparingTable] ));
|
||
}
|
||
DebugTrace(( 0, Dbg, "\n" ));
|
||
#endif
|
||
|
||
//
|
||
// If a sparing mcb doesn't exist, manufacture one.
|
||
//
|
||
|
||
if (Pcb->SparingMcb == NULL) {
|
||
|
||
Pcb->SparingMcb = FsRtlAllocatePoolWithTag( PagedPool, sizeof(LARGE_MCB), TAG_SPARING_MCB );
|
||
FsRtlInitializeLargeMcb( Pcb->SparingMcb, PagedPool );
|
||
}
|
||
|
||
SectorBuffer = FsRtlAllocatePoolWithTag( PagedPool, PAGE_SIZE, TAG_NSR_FSD );
|
||
|
||
//
|
||
// Now loop across the sparing tables and pull the data in.
|
||
//
|
||
|
||
try {
|
||
|
||
for (Complete = FALSE, SparingTable = 0;
|
||
|
||
SparingTable < Map->NumSparingTables;
|
||
|
||
SparingTable++) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, loading sparing table %u!\n",
|
||
SparingTable ));
|
||
|
||
ByteOffset = 0;
|
||
TotalBytes = 0;
|
||
RemainingBytes = 0;
|
||
|
||
do {
|
||
|
||
if (RemainingBytes == 0) {
|
||
|
||
(VOID) UdfReadSectors( IrpContext,
|
||
BytesFromSectors( Vcb, Map->TableLocation[SparingTable] ) + ByteOffset,
|
||
SectorSize( Vcb ),
|
||
FALSE,
|
||
SectorBuffer,
|
||
Vcb->TargetDeviceObject );
|
||
|
||
//
|
||
// Verify the descriptor at the head of the sparing table. If it is not
|
||
// valid, we just break out for a chance at the next table, if any.
|
||
//
|
||
|
||
if (ByteOffset == 0) {
|
||
|
||
Header = (PSPARING_TABLE_HEADER) SectorBuffer;
|
||
|
||
if (!UdfVerifyDescriptor( IrpContext,
|
||
&Header->Destag,
|
||
0,
|
||
SectorSize( Vcb ),
|
||
Header->Destag.Lbn,
|
||
TRUE )) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, sparing table %u didn't verify destag!\n",
|
||
SparingTable ));
|
||
break;
|
||
}
|
||
|
||
if (!UdfUdfIdentifierContained( &Header->RegID,
|
||
&UdfSparingTableIdentifier,
|
||
UDF_VERSION_150,
|
||
UDF_VERSION_RECOGNIZED,
|
||
OSCLASS_INVALID,
|
||
OSIDENTIFIER_INVALID)) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, sparing table %u didn't verify regid!\n",
|
||
SparingTable ));
|
||
break;
|
||
}
|
||
|
||
//
|
||
// Calculate the total number bytes this map spans and check it against what
|
||
// we were told the sparing table sizes are.
|
||
//
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, Sparing table %u has %u entries\n",
|
||
SparingTable,
|
||
Header->TableEntries ));
|
||
|
||
TotalBytes = sizeof(SPARING_TABLE_HEADER) + Header->TableEntries * sizeof(SPARING_TABLE_ENTRY);
|
||
|
||
if (Map->TableSize < TotalBytes) {
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, sparing table #ents %u overflows allocation!\n",
|
||
Header->TableEntries ));
|
||
break;
|
||
}
|
||
|
||
//
|
||
// So far so good, advance past the header.
|
||
//
|
||
|
||
ByteOffset = sizeof(SPARING_TABLE_HEADER);
|
||
Entry = Add2Ptr( SectorBuffer, sizeof(SPARING_TABLE_HEADER), PSPARING_TABLE_ENTRY );
|
||
|
||
} else {
|
||
|
||
//
|
||
// Pick up in the new sector.
|
||
//
|
||
|
||
Entry = (PSPARING_TABLE_ENTRY) SectorBuffer;
|
||
}
|
||
|
||
RemainingBytes = Min( SectorSize( Vcb ), TotalBytes - ByteOffset );
|
||
}
|
||
|
||
//
|
||
// Add the mapping. Since sparing tables are an Lbn->Psn mapping,
|
||
// very odd, and I want to simplify things by putting the sparing
|
||
// in right at IO dispatch, translate this to a Psn->Psn mapping.
|
||
//
|
||
|
||
if (Entry->Original != UDF_SPARING_AVALIABLE &&
|
||
Entry->Original != UDF_SPARING_DEFECTIVE) {
|
||
|
||
Psn = Partition->Physical.Start + SectorsFromBlocks( Vcb, Entry->Original );
|
||
|
||
DebugTrace(( 0, Dbg, "UdfLoadSparingTables, mapping from Psn %x (Lbn %x) -> Psn %x\n",
|
||
Psn,
|
||
Entry->Original,
|
||
Entry->Mapped ));
|
||
|
||
FsRtlAddLargeMcbEntry( Pcb->SparingMcb,
|
||
Psn,
|
||
Entry->Mapped,
|
||
UDF_SPARING_PACKET_LENGTH );
|
||
}
|
||
|
||
//
|
||
// Advance to the next, and drop out if we've hit the end.
|
||
//
|
||
|
||
ByteOffset += sizeof(SPARING_TABLE_ENTRY);
|
||
RemainingBytes -= sizeof(SPARING_TABLE_ENTRY);
|
||
Entry++;
|
||
|
||
} while ( ByteOffset < TotalBytes );
|
||
}
|
||
|
||
} finally {
|
||
|
||
DebugUnwind( UdfLoadSparingTables );
|
||
|
||
UdfFreePool( &SectorBuffer );
|
||
}
|
||
|
||
DebugTrace(( -1, Dbg, "UdfLoadSparingTables -> STATUS_SUCCESS\n" ));
|
||
|
||
return STATUS_SUCCESS;
|
||
}
|