mirror of
https://github.com/reactos/reactos.git
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774 lines
20 KiB
C
774 lines
20 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2002, 2014 ReactOS Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: drivers/filesystem/ntfs/fcb.c
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* PURPOSE: NTFS filesystem driver
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* PROGRAMMERS: Eric Kohl
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* Pierre Schweitzer (pierre@reactos.org)
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* Hervé Poussineau (hpoussin@reactos.org)
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*/
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/* INCLUDES *****************************************************************/
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#include "ntfs.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ****************************************************************/
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static
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PCWSTR
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NtfsGetNextPathElement(PCWSTR FileName)
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{
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if (*FileName == L'\0')
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{
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return NULL;
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}
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while (*FileName != L'\0' && *FileName != L'\\')
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{
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FileName++;
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}
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return FileName;
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}
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static
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VOID
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NtfsWSubString(PWCHAR pTarget,
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PCWSTR pSource,
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size_t pLength)
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{
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wcsncpy(pTarget, pSource, pLength);
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pTarget[pLength] = L'\0';
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}
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PNTFS_FCB
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NtfsCreateFCB(PCWSTR FileName,
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PCWSTR Stream,
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PNTFS_VCB Vcb)
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{
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PNTFS_FCB Fcb;
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ASSERT(Vcb);
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ASSERT(Vcb->Identifier.Type == NTFS_TYPE_VCB);
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Fcb = ExAllocateFromNPagedLookasideList(&NtfsGlobalData->FcbLookasideList);
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RtlZeroMemory(Fcb, sizeof(NTFS_FCB));
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Fcb->Identifier.Type = NTFS_TYPE_FCB;
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Fcb->Identifier.Size = sizeof(NTFS_TYPE_FCB);
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Fcb->Vcb = Vcb;
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if (FileName)
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{
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wcscpy(Fcb->PathName, FileName);
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if (wcsrchr(Fcb->PathName, '\\') != 0)
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{
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Fcb->ObjectName = wcsrchr(Fcb->PathName, '\\');
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}
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else
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{
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Fcb->ObjectName = Fcb->PathName;
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}
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}
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if (Stream)
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{
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wcscpy(Fcb->Stream, Stream);
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}
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else
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{
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Fcb->Stream[0] = UNICODE_NULL;
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}
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ExInitializeResourceLite(&Fcb->MainResource);
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Fcb->RFCB.Resource = &(Fcb->MainResource);
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return Fcb;
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}
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VOID
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NtfsDestroyFCB(PNTFS_FCB Fcb)
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{
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ASSERT(Fcb);
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ASSERT(Fcb->Identifier.Type == NTFS_TYPE_FCB);
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ExDeleteResourceLite(&Fcb->MainResource);
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ExFreeToNPagedLookasideList(&NtfsGlobalData->FcbLookasideList, Fcb);
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}
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BOOLEAN
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NtfsFCBIsDirectory(PNTFS_FCB Fcb)
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{
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return ((Fcb->Entry.FileAttributes & NTFS_FILE_TYPE_DIRECTORY) == NTFS_FILE_TYPE_DIRECTORY);
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}
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BOOLEAN
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NtfsFCBIsReparsePoint(PNTFS_FCB Fcb)
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{
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return ((Fcb->Entry.FileAttributes & NTFS_FILE_TYPE_REPARSE) == NTFS_FILE_TYPE_REPARSE);
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}
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BOOLEAN
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NtfsFCBIsCompressed(PNTFS_FCB Fcb)
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{
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return ((Fcb->Entry.FileAttributes & NTFS_FILE_TYPE_COMPRESSED) == NTFS_FILE_TYPE_COMPRESSED);
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}
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BOOLEAN
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NtfsFCBIsRoot(PNTFS_FCB Fcb)
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{
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return (wcscmp(Fcb->PathName, L"\\") == 0);
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}
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VOID
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NtfsGrabFCB(PNTFS_VCB Vcb,
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PNTFS_FCB Fcb)
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{
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KIRQL oldIrql;
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DPRINT("grabbing FCB at %p: %S, refCount:%d\n",
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Fcb,
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Fcb->PathName,
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Fcb->RefCount);
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KeAcquireSpinLock(&Vcb->FcbListLock, &oldIrql);
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Fcb->RefCount++;
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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}
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VOID
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NtfsReleaseFCB(PNTFS_VCB Vcb,
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PNTFS_FCB Fcb)
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{
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KIRQL oldIrql;
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DPRINT("releasing FCB at %p: %S, refCount:%d\n",
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Fcb,
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Fcb->PathName,
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Fcb->RefCount);
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KeAcquireSpinLock(&Vcb->FcbListLock, &oldIrql);
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Fcb->RefCount--;
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if (Fcb->RefCount <= 0 && !NtfsFCBIsDirectory(Fcb))
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{
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RemoveEntryList(&Fcb->FcbListEntry);
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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CcUninitializeCacheMap(Fcb->FileObject, NULL, NULL);
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NtfsDestroyFCB(Fcb);
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}
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else
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{
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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}
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}
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VOID
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NtfsAddFCBToTable(PNTFS_VCB Vcb,
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PNTFS_FCB Fcb)
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{
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KIRQL oldIrql;
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KeAcquireSpinLock(&Vcb->FcbListLock, &oldIrql);
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Fcb->Vcb = Vcb;
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InsertTailList(&Vcb->FcbListHead, &Fcb->FcbListEntry);
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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}
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PNTFS_FCB
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NtfsGrabFCBFromTable(PNTFS_VCB Vcb,
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PCWSTR FileName)
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{
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KIRQL oldIrql;
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PNTFS_FCB Fcb;
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PLIST_ENTRY current_entry;
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KeAcquireSpinLock(&Vcb->FcbListLock, &oldIrql);
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if (FileName == NULL || *FileName == 0)
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{
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DPRINT("Return FCB for stream file object\n");
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Fcb = Vcb->StreamFileObject->FsContext;
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Fcb->RefCount++;
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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return Fcb;
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}
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current_entry = Vcb->FcbListHead.Flink;
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while (current_entry != &Vcb->FcbListHead)
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{
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Fcb = CONTAINING_RECORD(current_entry, NTFS_FCB, FcbListEntry);
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DPRINT("Comparing '%S' and '%S'\n", FileName, Fcb->PathName);
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if (_wcsicmp(FileName, Fcb->PathName) == 0)
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{
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Fcb->RefCount++;
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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return Fcb;
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}
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//FIXME: need to compare against short name in FCB here
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current_entry = current_entry->Flink;
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}
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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return NULL;
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}
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NTSTATUS
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NtfsFCBInitializeCache(PNTFS_VCB Vcb,
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PNTFS_FCB Fcb)
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{
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PFILE_OBJECT FileObject;
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NTSTATUS Status;
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PNTFS_CCB newCCB;
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FileObject = IoCreateStreamFileObject(NULL, Vcb->StorageDevice);
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newCCB = ExAllocatePoolWithTag(NonPagedPool, sizeof(NTFS_CCB), TAG_CCB);
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if (newCCB == NULL)
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{
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlZeroMemory(newCCB, sizeof(NTFS_CCB));
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newCCB->Identifier.Type = NTFS_TYPE_CCB;
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newCCB->Identifier.Size = sizeof(NTFS_TYPE_CCB);
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FileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
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FileObject->FsContext = Fcb;
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FileObject->FsContext2 = newCCB;
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newCCB->PtrFileObject = FileObject;
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Fcb->FileObject = FileObject;
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Fcb->Vcb = Vcb;
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Status = STATUS_SUCCESS;
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_SEH2_TRY
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{
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CcInitializeCacheMap(FileObject,
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(PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
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FALSE,
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&(NtfsGlobalData->CacheMgrCallbacks),
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Fcb);
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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FileObject->FsContext2 = NULL;
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ExFreePoolWithTag(newCCB, TAG_CCB);
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ObDereferenceObject(FileObject);
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Fcb->FileObject = NULL;
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return _SEH2_GetExceptionCode();
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}
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_SEH2_END;
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ObDereferenceObject(FileObject);
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Fcb->Flags |= FCB_CACHE_INITIALIZED;
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return Status;
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}
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PNTFS_FCB
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NtfsMakeRootFCB(PNTFS_VCB Vcb)
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{
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PNTFS_FCB Fcb;
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PFILE_RECORD_HEADER MftRecord;
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PFILENAME_ATTRIBUTE FileName;
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MftRecord = ExAllocateFromNPagedLookasideList(&Vcb->FileRecLookasideList);
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if (MftRecord == NULL)
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{
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return NULL;
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}
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if (!NT_SUCCESS(ReadFileRecord(Vcb, NTFS_FILE_ROOT, MftRecord)))
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{
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ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, MftRecord);
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return NULL;
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}
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FileName = GetFileNameFromRecord(Vcb, MftRecord, NTFS_FILE_NAME_WIN32);
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if (!FileName)
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{
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ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, MftRecord);
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return NULL;
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}
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Fcb = NtfsCreateFCB(L"\\", NULL, Vcb);
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if (!Fcb)
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{
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ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, MftRecord);
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return NULL;
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}
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memcpy(&Fcb->Entry, FileName, FIELD_OFFSET(FILENAME_ATTRIBUTE, NameLength));
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Fcb->Entry.NameType = FileName->NameType;
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Fcb->Entry.NameLength = 0;
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Fcb->Entry.Name[0] = UNICODE_NULL;
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Fcb->RefCount = 1;
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Fcb->DirIndex = 0;
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Fcb->RFCB.FileSize.QuadPart = FileName->DataSize;
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Fcb->RFCB.ValidDataLength.QuadPart = FileName->DataSize;
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Fcb->RFCB.AllocationSize.QuadPart = FileName->AllocatedSize;
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Fcb->MFTIndex = NTFS_FILE_ROOT;
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Fcb->LinkCount = MftRecord->LinkCount;
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NtfsFCBInitializeCache(Vcb, Fcb);
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NtfsAddFCBToTable(Vcb, Fcb);
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NtfsGrabFCB(Vcb, Fcb);
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ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, MftRecord);
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return Fcb;
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}
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PNTFS_FCB
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NtfsOpenRootFCB(PNTFS_VCB Vcb)
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{
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PNTFS_FCB Fcb;
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Fcb = NtfsGrabFCBFromTable(Vcb, L"\\");
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if (Fcb == NULL)
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{
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Fcb = NtfsMakeRootFCB(Vcb);
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}
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return Fcb;
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}
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NTSTATUS
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NtfsMakeFCBFromDirEntry(PNTFS_VCB Vcb,
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PNTFS_FCB DirectoryFCB,
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PUNICODE_STRING Name,
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PCWSTR Stream,
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PFILE_RECORD_HEADER Record,
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ULONGLONG MFTIndex,
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PNTFS_FCB * fileFCB)
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{
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WCHAR pathName[MAX_PATH];
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PFILENAME_ATTRIBUTE FileName;
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PSTANDARD_INFORMATION StdInfo;
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PNTFS_FCB rcFCB;
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ULONGLONG Size, AllocatedSize;
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DPRINT("NtfsMakeFCBFromDirEntry(%p, %p, %wZ, %p, %p, %p)\n", Vcb, DirectoryFCB, Name, Stream, Record, fileFCB);
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FileName = GetBestFileNameFromRecord(Vcb, Record);
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if (!FileName)
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{
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return STATUS_OBJECT_NAME_NOT_FOUND; // Not sure that's the best here
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}
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if (DirectoryFCB && Name)
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{
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if (Name->Buffer[0] != 0 && wcslen(DirectoryFCB->PathName) +
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sizeof(WCHAR) + Name->Length / sizeof(WCHAR) > MAX_PATH)
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{
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return STATUS_OBJECT_NAME_INVALID;
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}
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wcscpy(pathName, DirectoryFCB->PathName);
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if (!NtfsFCBIsRoot(DirectoryFCB))
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{
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wcscat(pathName, L"\\");
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}
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wcscat(pathName, Name->Buffer);
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}
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else
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{
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RtlCopyMemory(pathName, FileName->Name, FileName->NameLength * sizeof (WCHAR));
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pathName[FileName->NameLength] = UNICODE_NULL;
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}
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Size = NtfsGetFileSize(Vcb, Record, (Stream ? Stream : L""), (Stream ? wcslen(Stream) : 0), &AllocatedSize);
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rcFCB = NtfsCreateFCB(pathName, Stream, Vcb);
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if (!rcFCB)
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{
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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memcpy(&rcFCB->Entry, FileName, FIELD_OFFSET(FILENAME_ATTRIBUTE, NameLength));
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rcFCB->Entry.NameType = FileName->NameType;
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rcFCB->RFCB.FileSize.QuadPart = Size;
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rcFCB->RFCB.ValidDataLength.QuadPart = Size;
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rcFCB->RFCB.AllocationSize.QuadPart = AllocatedSize;
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StdInfo = GetStandardInformationFromRecord(Vcb, Record);
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if (StdInfo != NULL)
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{
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rcFCB->Entry.FileAttributes |= StdInfo->FileAttribute;
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}
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NtfsFCBInitializeCache(Vcb, rcFCB);
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rcFCB->RefCount = 1;
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rcFCB->MFTIndex = MFTIndex;
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rcFCB->LinkCount = Record->LinkCount;
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NtfsAddFCBToTable(Vcb, rcFCB);
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*fileFCB = rcFCB;
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NtfsAttachFCBToFileObject(PNTFS_VCB Vcb,
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PNTFS_FCB Fcb,
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PFILE_OBJECT FileObject)
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{
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PNTFS_CCB newCCB;
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newCCB = ExAllocatePoolWithTag(NonPagedPool, sizeof(NTFS_CCB), TAG_CCB);
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if (newCCB == NULL)
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{
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlZeroMemory(newCCB, sizeof(NTFS_CCB));
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newCCB->Identifier.Type = NTFS_TYPE_CCB;
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newCCB->Identifier.Size = sizeof(NTFS_TYPE_CCB);
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FileObject->SectionObjectPointer = &Fcb->SectionObjectPointers;
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FileObject->FsContext = Fcb;
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FileObject->FsContext2 = newCCB;
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newCCB->PtrFileObject = FileObject;
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Fcb->Vcb = Vcb;
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if (!(Fcb->Flags & FCB_CACHE_INITIALIZED))
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{
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_SEH2_TRY
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{
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CcInitializeCacheMap(FileObject,
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(PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
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FALSE,
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&(NtfsGlobalData->CacheMgrCallbacks),
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Fcb);
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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FileObject->FsContext2 = NULL;
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ExFreePoolWithTag(newCCB, TAG_CCB);
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return _SEH2_GetExceptionCode();
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}
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_SEH2_END;
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Fcb->Flags |= FCB_CACHE_INITIALIZED;
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}
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//DPRINT("file open: fcb:%x file size: %d\n", Fcb, Fcb->Entry.DataLengthL);
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return STATUS_SUCCESS;
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}
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static NTSTATUS
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NtfsDirFindFile(PNTFS_VCB Vcb,
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PNTFS_FCB DirectoryFcb,
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PWSTR FileToFind,
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BOOLEAN CaseSensitive,
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PNTFS_FCB *FoundFCB)
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{
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NTSTATUS Status;
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ULONGLONG CurrentDir;
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UNICODE_STRING File;
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PFILE_RECORD_HEADER FileRecord;
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ULONGLONG MFTIndex;
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PWSTR Colon, OldColon;
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PNTFS_ATTR_CONTEXT DataContext;
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USHORT Length = 0;
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DPRINT("NtfsDirFindFile(%p, %p, %S, %s, %p)\n",
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Vcb,
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DirectoryFcb,
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FileToFind,
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CaseSensitive ? "TRUE" : "FALSE",
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FoundFCB);
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*FoundFCB = NULL;
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RtlInitUnicodeString(&File, FileToFind);
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CurrentDir = DirectoryFcb->MFTIndex;
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Colon = wcsrchr(FileToFind, L':');
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if (Colon != NULL)
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{
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Length = File.Length;
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File.Length = (Colon - FileToFind) * sizeof(WCHAR);
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if (_wcsicmp(Colon + 1, L"$DATA") == 0)
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{
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OldColon = Colon;
|
|
Colon[0] = UNICODE_NULL;
|
|
Colon = wcsrchr(FileToFind, L':');
|
|
if (Colon != NULL)
|
|
{
|
|
Length = File.Length;
|
|
File.Length = (Colon - FileToFind) * sizeof(WCHAR);
|
|
}
|
|
else
|
|
{
|
|
Colon = OldColon;
|
|
Colon[0] = L':';
|
|
}
|
|
}
|
|
|
|
/* Skip colon */
|
|
++Colon;
|
|
DPRINT1("Will now look for file '%wZ' with stream '%S'\n", &File, Colon);
|
|
}
|
|
|
|
Status = NtfsLookupFileAt(Vcb, &File, CaseSensitive, &FileRecord, &MFTIndex, CurrentDir);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
return Status;
|
|
}
|
|
|
|
if (Length != 0)
|
|
{
|
|
File.Length = Length;
|
|
}
|
|
|
|
if ((FileRecord->Flags & FRH_DIRECTORY) && Colon != 0)
|
|
{
|
|
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, FileRecord);
|
|
return STATUS_INVALID_PARAMETER;
|
|
}
|
|
else if (Colon != 0)
|
|
{
|
|
Status = FindAttribute(Vcb, FileRecord, AttributeData, Colon, wcslen(Colon), &DataContext, NULL);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
return STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
ReleaseAttributeContext(DataContext);
|
|
}
|
|
|
|
Status = NtfsMakeFCBFromDirEntry(Vcb, DirectoryFcb, &File, Colon, FileRecord, MFTIndex, FoundFCB);
|
|
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, FileRecord);
|
|
|
|
return Status;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
NtfsGetFCBForFile(PNTFS_VCB Vcb,
|
|
PNTFS_FCB *pParentFCB,
|
|
PNTFS_FCB *pFCB,
|
|
PCWSTR pFileName,
|
|
BOOLEAN CaseSensitive)
|
|
{
|
|
NTSTATUS Status;
|
|
WCHAR pathName [MAX_PATH];
|
|
WCHAR elementName [MAX_PATH];
|
|
PCWSTR currentElement;
|
|
PNTFS_FCB FCB;
|
|
PNTFS_FCB parentFCB;
|
|
|
|
DPRINT("NtfsGetFCBForFile(%p, %p, %p, '%S', %s)\n",
|
|
Vcb,
|
|
pParentFCB,
|
|
pFCB,
|
|
pFileName,
|
|
CaseSensitive ? "TRUE" : "FALSE");
|
|
|
|
/* Dummy code */
|
|
// FCB = NtfsOpenRootFCB(Vcb);
|
|
// *pFCB = FCB;
|
|
// *pParentFCB = NULL;
|
|
|
|
#if 1
|
|
/* Trivial case, open of the root directory on volume */
|
|
if (pFileName[0] == L'\0' || wcscmp(pFileName, L"\\") == 0)
|
|
{
|
|
DPRINT("returning root FCB\n");
|
|
|
|
FCB = NtfsOpenRootFCB(Vcb);
|
|
*pFCB = FCB;
|
|
*pParentFCB = NULL;
|
|
|
|
return (FCB != NULL) ? STATUS_SUCCESS : STATUS_OBJECT_PATH_NOT_FOUND;
|
|
}
|
|
else
|
|
{
|
|
currentElement = pFileName + 1;
|
|
wcscpy (pathName, L"\\");
|
|
FCB = NtfsOpenRootFCB (Vcb);
|
|
}
|
|
|
|
parentFCB = NULL;
|
|
|
|
/* Parse filename and check each path element for existence and access */
|
|
while (NtfsGetNextPathElement(currentElement) != 0)
|
|
{
|
|
/* Skip blank directory levels */
|
|
if ((NtfsGetNextPathElement(currentElement) - currentElement) == 0)
|
|
{
|
|
currentElement++;
|
|
continue;
|
|
}
|
|
|
|
DPRINT("Parsing, currentElement:%S\n", currentElement);
|
|
DPRINT(" parentFCB:%p FCB:%p\n", parentFCB, FCB);
|
|
|
|
/* Descend to next directory level */
|
|
if (parentFCB)
|
|
{
|
|
NtfsReleaseFCB(Vcb, parentFCB);
|
|
parentFCB = NULL;
|
|
}
|
|
|
|
/* fail if element in FCB is not a directory */
|
|
if (!NtfsFCBIsDirectory(FCB))
|
|
{
|
|
DPRINT("Element in requested path is not a directory\n");
|
|
|
|
NtfsReleaseFCB(Vcb, FCB);
|
|
FCB = 0;
|
|
*pParentFCB = NULL;
|
|
*pFCB = NULL;
|
|
|
|
return STATUS_OBJECT_PATH_NOT_FOUND;
|
|
}
|
|
|
|
parentFCB = FCB;
|
|
|
|
/* Extract next directory level into dirName */
|
|
NtfsWSubString(pathName,
|
|
pFileName,
|
|
NtfsGetNextPathElement(currentElement) - pFileName);
|
|
DPRINT(" pathName:%S\n", pathName);
|
|
|
|
FCB = NtfsGrabFCBFromTable(Vcb, pathName);
|
|
if (FCB == NULL)
|
|
{
|
|
NtfsWSubString(elementName,
|
|
currentElement,
|
|
NtfsGetNextPathElement(currentElement) - currentElement);
|
|
DPRINT(" elementName:%S\n", elementName);
|
|
|
|
Status = NtfsDirFindFile(Vcb, parentFCB, elementName, CaseSensitive, &FCB);
|
|
if (Status == STATUS_OBJECT_NAME_NOT_FOUND)
|
|
{
|
|
*pParentFCB = parentFCB;
|
|
*pFCB = NULL;
|
|
currentElement = NtfsGetNextPathElement(currentElement);
|
|
if (*currentElement == L'\0' || NtfsGetNextPathElement(currentElement + 1) == 0)
|
|
{
|
|
return STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
else
|
|
{
|
|
return STATUS_OBJECT_PATH_NOT_FOUND;
|
|
}
|
|
}
|
|
else if (!NT_SUCCESS(Status))
|
|
{
|
|
NtfsReleaseFCB(Vcb, parentFCB);
|
|
*pParentFCB = NULL;
|
|
*pFCB = NULL;
|
|
|
|
return Status;
|
|
}
|
|
}
|
|
|
|
currentElement = NtfsGetNextPathElement(currentElement);
|
|
}
|
|
|
|
*pParentFCB = parentFCB;
|
|
*pFCB = FCB;
|
|
#endif
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
NtfsReadFCBAttribute(PNTFS_VCB Vcb,
|
|
PNTFS_FCB pFCB,
|
|
ULONG Type,
|
|
PCWSTR Name,
|
|
ULONG NameLength,
|
|
PVOID * Data)
|
|
{
|
|
NTSTATUS Status;
|
|
PFILE_RECORD_HEADER FileRecord;
|
|
PNTFS_ATTR_CONTEXT AttrCtxt;
|
|
ULONGLONG AttrLength;
|
|
|
|
FileRecord = ExAllocateFromNPagedLookasideList(&Vcb->FileRecLookasideList);
|
|
if (FileRecord == NULL)
|
|
{
|
|
return STATUS_INSUFFICIENT_RESOURCES;
|
|
}
|
|
|
|
Status = ReadFileRecord(Vcb, pFCB->MFTIndex, FileRecord);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, FileRecord);
|
|
return Status;
|
|
}
|
|
|
|
Status = FindAttribute(Vcb, FileRecord, Type, Name, NameLength, &AttrCtxt, NULL);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, FileRecord);
|
|
return Status;
|
|
}
|
|
|
|
AttrLength = AttributeDataLength(AttrCtxt->pRecord);
|
|
*Data = ExAllocatePoolWithTag(NonPagedPool, AttrLength, TAG_NTFS);
|
|
if (*Data == NULL)
|
|
{
|
|
ReleaseAttributeContext(AttrCtxt);
|
|
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, FileRecord);
|
|
return STATUS_INSUFFICIENT_RESOURCES;
|
|
}
|
|
|
|
ReadAttribute(Vcb, AttrCtxt, 0, *Data, AttrLength);
|
|
|
|
ReleaseAttributeContext(AttrCtxt);
|
|
ExFreeToNPagedLookasideList(&Vcb->FileRecLookasideList, FileRecord);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
/* EOF */
|