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![Amine Khaldi](/assets/img/avatar_default.png)
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
693 lines
16 KiB
C
693 lines
16 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2002 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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* PROGRAMMER: Eric Kohl
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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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/* MACROS *******************************************************************/
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#define TAG_FCB 'BCFI'
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/* FUNCTIONS ****************************************************************/
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static
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PWCHAR
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NtfsGetNextPathElement(PWCHAR 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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const PWCHAR 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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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 = ExAllocatePoolWithTag(NonPagedPool, sizeof(NTFS_FCB), TAG_FCB);
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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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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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ExFreePool(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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UNREFERENCED_PARAMETER(Fcb);
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// return(Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY);
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// return(Fcb->Entry.FileFlags & 0x02);
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return TRUE;
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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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CcUninitializeCacheMap(Fcb->FileObject, NULL, NULL);
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NtfsDestroyFCB(Fcb);
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}
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KeReleaseSpinLock(&Vcb->FcbListLock, oldIrql);
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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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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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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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Fcb = NtfsCreateFCB(L"\\", Vcb);
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// memset(Fcb->entry.Filename, ' ', 11);
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// Fcb->Entry.DataLengthL = Vcb->CdInfo.RootSize;
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// Fcb->Entry.ExtentLocationL = Vcb->CdInfo.RootStart;
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// Fcb->Entry.FileFlags = 0x02; // FILE_ATTRIBUTE_DIRECTORY;
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Fcb->RefCount = 1;
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Fcb->DirIndex = 0;
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Fcb->RFCB.FileSize.QuadPart = PAGE_SIZE;//Vcb->CdInfo.RootSize;
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Fcb->RFCB.ValidDataLength.QuadPart = PAGE_SIZE;//Vcb->CdInfo.RootSize;
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Fcb->RFCB.AllocationSize.QuadPart = PAGE_SIZE;//Vcb->CdInfo.RootSize;
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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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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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#if 0
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static VOID
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NtfsGetDirEntryName(PDEVICE_EXTENSION DeviceExt,
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PDIR_RECORD Record,
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PWSTR Name)
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/*
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* FUNCTION: Retrieves the file name, be it in short or long file name format
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*/
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{
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if (Record->FileIdLength == 1 && Record->FileId[0] == 0)
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{
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wcscpy(Name, L".");
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}
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else if (Record->FileIdLength == 1 && Record->FileId[0] == 1)
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{
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wcscpy(Name, L"..");
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}
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else
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{
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if (DeviceExt->CdInfo.JolietLevel == 0)
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{
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ULONG i;
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for (i = 0; i < Record->FileIdLength && Record->FileId[i] != ';'; i++)
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Name[i] = (WCHAR)Record->FileId[i];
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Name[i] = 0;
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}
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else
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{
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NtfsSwapString(Name, Record->FileId, Record->FileIdLength);
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}
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}
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DPRINT("Name '%S'\n", Name);
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}
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NTSTATUS
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NtfsMakeFCBFromDirEntry(PVCB Vcb,
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PFCB DirectoryFCB,
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PWSTR Name,
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PDIR_RECORD Record,
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PFCB * fileFCB)
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{
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WCHAR pathName[MAX_PATH];
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PFCB rcFCB;
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ULONG Size;
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if (Name [0] != 0 && wcslen (DirectoryFCB->PathName) +
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sizeof(WCHAR) + wcslen (Name) > 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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if (Name[0] != 0)
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{
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wcscat(pathName, Name);
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}
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else
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{
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WCHAR entryName[MAX_PATH];
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NtfsGetDirEntryName(Vcb, Record, entryName);
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wcscat(pathName, entryName);
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}
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rcFCB = NtfsCreateFCB(pathName, Vcb);
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memcpy(&rcFCB->Entry, Record, sizeof(DIR_RECORD));
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Size = rcFCB->Entry.DataLengthL;
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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 = ROUND_UP(Size, BLOCKSIZE);
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// DPRINT1("%S %d %d\n", longName, Size, (ULONG)rcFCB->RFCB.AllocationSize.QuadPart);
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NtfsFCBInitializeCache(Vcb, rcFCB);
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rcFCB->RefCount++;
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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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#endif
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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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CcInitializeCacheMap(FileObject,
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(PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
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FALSE,
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NULL,
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NULL);
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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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PNTFS_FCB *FoundFCB)
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{
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#if 0
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WCHAR TempName[2];
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WCHAR Name[256];
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PVOID Block;
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ULONG FirstSector;
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ULONG DirSize;
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PDIR_RECORD Record;
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ULONG Offset;
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ULONG BlockOffset;
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NTSTATUS Status;
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LARGE_INTEGER StreamOffset;
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PVOID Context;
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ASSERT(DeviceExt);
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ASSERT(DirectoryFcb);
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ASSERT(FileToFind);
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DPRINT("NtfsDirFindFile(VCB:%08x, dirFCB:%08x, File:%S)\n",
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DeviceExt,
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DirectoryFcb,
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FileToFind);
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DPRINT("Dir Path:%S\n", DirectoryFcb->PathName);
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/* default to '.' if no filename specified */
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if (wcslen(FileToFind) == 0)
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{
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TempName[0] = L'.';
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TempName[1] = 0;
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FileToFind = TempName;
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}
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DirSize = DirectoryFcb->Entry.DataLengthL;
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StreamOffset.QuadPart = (LONGLONG)DirectoryFcb->Entry.ExtentLocationL * (LONGLONG)BLOCKSIZE;
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if(!CcMapData(DeviceExt->StreamFileObject, &StreamOffset,
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BLOCKSIZE, TRUE, &Context, &Block))
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{
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DPRINT("CcMapData() failed\n");
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return(STATUS_UNSUCCESSFUL);
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}
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Offset = 0;
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BlockOffset = 0;
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Record = (PDIR_RECORD)Block;
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while(TRUE)
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{
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if (Record->RecordLength == 0)
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{
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DPRINT("RecordLength == 0 Stopped!\n");
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break;
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}
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DPRINT("RecordLength %u ExtAttrRecordLength %u NameLength %u\n",
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Record->RecordLength, Record->ExtAttrRecordLength, Record->FileIdLength);
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NtfsGetDirEntryName(DeviceExt, Record, Name);
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DPRINT("Name '%S'\n", Name);
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if (wstrcmpjoki(Name, FileToFind))
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{
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DPRINT("Match found, %S\n", Name);
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Status = NtfsMakeFCBFromDirEntry(DeviceExt,
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DirectoryFcb,
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Name,
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Record,
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FoundFCB);
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CcUnpinData(Context);
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return(Status);
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}
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Offset += Record->RecordLength;
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BlockOffset += Record->RecordLength;
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Record = (PDIR_RECORD)(Block + BlockOffset);
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if (BlockOffset >= BLOCKSIZE || Record->RecordLength == 0)
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{
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DPRINT("Map next sector\n");
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CcUnpinData(Context);
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StreamOffset.QuadPart += BLOCKSIZE;
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Offset = ROUND_UP(Offset, BLOCKSIZE);
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BlockOffset = 0;
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if (!CcMapData(DeviceExt->StreamFileObject,
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&StreamOffset,
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BLOCKSIZE, TRUE,
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&Context, &Block))
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{
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DPRINT("CcMapData() failed\n");
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return(STATUS_UNSUCCESSFUL);
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}
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Record = (PDIR_RECORD)(Block + BlockOffset);
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}
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if (Offset >= DirSize)
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break;
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}
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CcUnpinData(Context);
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#else
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UNREFERENCED_PARAMETER(Vcb);
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UNREFERENCED_PARAMETER(DirectoryFcb);
|
|
UNREFERENCED_PARAMETER(FileToFind);
|
|
UNREFERENCED_PARAMETER(FoundFCB);
|
|
#endif
|
|
return STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
|
|
|
|
NTSTATUS
|
|
NtfsGetFCBForFile(PNTFS_VCB Vcb,
|
|
PNTFS_FCB *pParentFCB,
|
|
PNTFS_FCB *pFCB,
|
|
const PWSTR pFileName)
|
|
{
|
|
NTSTATUS Status;
|
|
WCHAR pathName [MAX_PATH];
|
|
WCHAR elementName [MAX_PATH];
|
|
PWCHAR currentElement;
|
|
PNTFS_FCB FCB;
|
|
PNTFS_FCB parentFCB;
|
|
|
|
DPRINT("NtfsGetFCBForFile(%p, %p, %p, '%S')\n",
|
|
Vcb,
|
|
pParentFCB,
|
|
pFCB,
|
|
pFileName);
|
|
|
|
/* 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 existance 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, &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;
|
|
}
|
|
|
|
/* EOF */
|