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177 lines
3.5 KiB
177 lines
3.5 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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filobsup.c
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Abstract:
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This module implements the mup file object support routines.
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Author:
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Manny Weiser (mannyw) 20-Dec-1991
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Revision History:
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--*/
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#include "mup.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_FILOBSUP)
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text( PAGE, MupDecodeFileObject )
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#pragma alloc_text( PAGE, MupSetFileObject )
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#endif
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VOID
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MupSetFileObject (
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IN PFILE_OBJECT FileObject OPTIONAL,
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IN PVOID FsContext,
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IN PVOID FsContext2
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)
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/*++
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Routine Description:
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This routine sets the file system pointers within the file object.
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This routine MUST be called with the Global Lock held.
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Arguments:
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FileObject - Supplies a pointer to the file object being modified, and
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can optionally be null.
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FsContext - Supplies a pointer to the vcb.
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structure.
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FsContext2 - NULL
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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, "MupSetFileObject, FileObject = %08lx\n", (ULONG)FileObject );
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//
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// Set the fscontext fields of the file object.
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//
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FileObject->FsContext = FsContext;
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FileObject->FsContext2 = FsContext2;
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DebugTrace(-1, Dbg, "MupSetFileObject -> VOID\n", 0);
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return;
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}
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BLOCK_TYPE
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MupDecodeFileObject (
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IN PFILE_OBJECT FileObject,
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OUT PVOID *FsContext,
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OUT PVOID *FsContext2
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)
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/*++
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Routine Description:
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This procedure takes a pointer to a file object, that has already been
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opened by the MUP and figures out what it really is opened.
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Arguments:
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FileObject - Supplies the file object pointer being interrogated
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FsContext - Receive the file object FsContext pointer
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FsContext2 - Receive the file object FsContext2 pointer
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Return Value:
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BlockType - Returns the node type code for a Vcb or Fcb.
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Vcb - indicates that file object opens the mup driver.
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Ccb - indicates that the file object is for a broadcast mailslot file.
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Zero - indicates that the file object has been closed.
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--*/
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{
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BLOCK_TYPE blockType;
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PAGED_CODE();
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DebugTrace(+1, Dbg, "MupDecodeFileObject, FileObject = %08lx\n", (ULONG)FileObject);
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//
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// Acquire the global lock to protect the block reference counts.
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//
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MupAcquireGlobalLock();
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//
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// Read the fs FsContext fields of the file object, then reference
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// the block pointed at by the file object
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//
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*FsContext = FileObject->FsContext;
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*FsContext2 = FileObject->FsContext2;
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ASSERT( (*FsContext) != NULL );
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if ( ((*FsContext) == NULL) ||
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((PBLOCK_HEADER)(*FsContext))->BlockState != BlockStateActive ) {
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//
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// This Block is shutting down. Indicate this to the caller.
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//
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blockType = BlockTypeUndefined;
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} else if ( *FsContext != NULL ) {
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//
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// The node is active. Supply a referenced pointer to the node.
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//
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blockType = BlockType( *FsContext );
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MupReferenceBlock( *FsContext );
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}
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//
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// Release the global lock and return to the caller.
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//
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MupReleaseGlobalLock();
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DebugTrace(0,
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DEBUG_TRACE_REFCOUNT,
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"Referencing block %08lx\n",
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(ULONG)*FsContext);
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DebugTrace(0,
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DEBUG_TRACE_REFCOUNT,
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" Reference count = %lx\n",
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((PBLOCK_HEADER)(*FsContext))->ReferenceCount );
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DebugTrace(-1, Dbg, "MupDecodeFileObject -> %08lx\n", blockType);
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return blockType;
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}
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