mirror of
https://github.com/reactos/reactos.git
synced 2024-06-01 10:11:43 +00:00
1083 lines
30 KiB
C
1083 lines
30 KiB
C
/*
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* PROJECT: VFAT Filesystem
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* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
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* PURPOSE: Routines to manipulate FCBs
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* COPYRIGHT: Copyright 1998 Jason Filby <jasonfilby@yahoo.com>
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* Copyright 2001 Rex Jolliff <rex@lvcablemodem.com>
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* Copyright 2005-2022 Hervé Poussineau <hpoussin@reactos.org>
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* Copyright 2008-2018 Pierre Schweitzer <pierre@reactos.org>
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*/
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/* ------------------------------------------------------- INCLUDES */
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#include "vfat.h"
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#define NDEBUG
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#include <debug.h>
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#ifdef __GNUC__
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#include <wctype.h> /* towlower prototype */
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#endif
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/* -------------------------------------------------------- DEFINES */
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#ifdef KDBG
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extern UNICODE_STRING DebugFile;
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#endif
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/* -------------------------------------------------------- PUBLICS */
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static
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ULONG
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vfatNameHash(
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ULONG hash,
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PUNICODE_STRING NameU)
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{
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PWCHAR last;
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PWCHAR curr;
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register WCHAR c;
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// LFN could start from "."
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//ASSERT(NameU->Buffer[0] != L'.');
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curr = NameU->Buffer;
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last = NameU->Buffer + NameU->Length / sizeof(WCHAR);
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while(curr < last)
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{
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c = towlower(*curr++);
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hash = (hash + (c << 4) + (c >> 4)) * 11;
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}
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return hash;
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}
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VOID
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vfatSplitPathName(
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PUNICODE_STRING PathNameU,
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PUNICODE_STRING DirNameU,
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PUNICODE_STRING FileNameU)
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{
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PWCHAR pName;
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USHORT Length = 0;
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pName = PathNameU->Buffer + PathNameU->Length / sizeof(WCHAR) - 1;
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while (*pName != L'\\' && pName >= PathNameU->Buffer)
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{
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pName--;
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Length++;
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}
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ASSERT(*pName == L'\\' || pName < PathNameU->Buffer);
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if (FileNameU)
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{
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FileNameU->Buffer = pName + 1;
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FileNameU->Length = FileNameU->MaximumLength = Length * sizeof(WCHAR);
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}
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if (DirNameU)
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{
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DirNameU->Buffer = PathNameU->Buffer;
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DirNameU->Length = (pName + 1 - PathNameU->Buffer) * sizeof(WCHAR);
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DirNameU->MaximumLength = DirNameU->Length;
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}
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}
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static
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VOID
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vfatInitFcb(
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PVFATFCB Fcb,
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PUNICODE_STRING NameU)
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{
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USHORT PathNameBufferLength;
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if (NameU)
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PathNameBufferLength = NameU->Length + sizeof(WCHAR);
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else
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PathNameBufferLength = 0;
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Fcb->PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameBufferLength, TAG_FCB);
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if (!Fcb->PathNameBuffer)
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{
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/* FIXME: what to do if no more memory? */
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DPRINT1("Unable to initialize FCB for filename '%wZ'\n", NameU);
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KeBugCheckEx(FAT_FILE_SYSTEM, (ULONG_PTR)Fcb, (ULONG_PTR)NameU, 0, 0);
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}
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Fcb->RFCB.NodeTypeCode = NODE_TYPE_FCB;
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Fcb->RFCB.NodeByteSize = sizeof(VFATFCB);
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Fcb->PathNameU.Length = 0;
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Fcb->PathNameU.Buffer = Fcb->PathNameBuffer;
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Fcb->PathNameU.MaximumLength = PathNameBufferLength;
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Fcb->ShortNameU.Length = 0;
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Fcb->ShortNameU.Buffer = Fcb->ShortNameBuffer;
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Fcb->ShortNameU.MaximumLength = sizeof(Fcb->ShortNameBuffer);
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Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
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if (NameU && NameU->Length)
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{
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RtlCopyUnicodeString(&Fcb->PathNameU, NameU);
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vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
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}
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else
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{
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Fcb->DirNameU.Buffer = Fcb->LongNameU.Buffer = NULL;
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Fcb->DirNameU.MaximumLength = Fcb->DirNameU.Length = 0;
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Fcb->LongNameU.MaximumLength = Fcb->LongNameU.Length = 0;
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}
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RtlZeroMemory(&Fcb->FCBShareAccess, sizeof(SHARE_ACCESS));
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Fcb->OpenHandleCount = 0;
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}
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PVFATFCB
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vfatNewFCB(
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PDEVICE_EXTENSION pVCB,
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PUNICODE_STRING pFileNameU)
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{
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PVFATFCB rcFCB;
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DPRINT("'%wZ'\n", pFileNameU);
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rcFCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->FcbLookasideList);
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if (rcFCB == NULL)
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{
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return NULL;
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}
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RtlZeroMemory(rcFCB, sizeof(VFATFCB));
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vfatInitFcb(rcFCB, pFileNameU);
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if (vfatVolumeIsFatX(pVCB))
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rcFCB->Attributes = &rcFCB->entry.FatX.Attrib;
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else
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rcFCB->Attributes = &rcFCB->entry.Fat.Attrib;
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rcFCB->Hash.Hash = vfatNameHash(0, &rcFCB->PathNameU);
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rcFCB->Hash.self = rcFCB;
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rcFCB->ShortHash.self = rcFCB;
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ExInitializeResourceLite(&rcFCB->PagingIoResource);
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ExInitializeResourceLite(&rcFCB->MainResource);
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FsRtlInitializeFileLock(&rcFCB->FileLock, NULL, NULL);
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ExInitializeFastMutex(&rcFCB->LastMutex);
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rcFCB->RFCB.PagingIoResource = &rcFCB->PagingIoResource;
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rcFCB->RFCB.Resource = &rcFCB->MainResource;
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rcFCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
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InitializeListHead(&rcFCB->ParentListHead);
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return rcFCB;
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}
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static
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VOID
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vfatDelFCBFromTable(
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PDEVICE_EXTENSION pVCB,
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PVFATFCB pFCB)
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{
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ULONG Index;
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ULONG ShortIndex;
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HASHENTRY* entry;
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Index = pFCB->Hash.Hash % pVCB->HashTableSize;
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ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
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if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
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{
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entry = pVCB->FcbHashTable[ShortIndex];
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if (entry->self == pFCB)
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{
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pVCB->FcbHashTable[ShortIndex] = entry->next;
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}
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else
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{
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while (entry->next->self != pFCB)
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{
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entry = entry->next;
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}
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entry->next = pFCB->ShortHash.next;
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}
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}
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entry = pVCB->FcbHashTable[Index];
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if (entry->self == pFCB)
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{
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pVCB->FcbHashTable[Index] = entry->next;
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}
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else
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{
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while (entry->next->self != pFCB)
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{
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entry = entry->next;
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}
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entry->next = pFCB->Hash.next;
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}
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RemoveEntryList(&pFCB->FcbListEntry);
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}
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static
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NTSTATUS
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vfatMakeFullName(
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PVFATFCB directoryFCB,
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PUNICODE_STRING LongNameU,
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PUNICODE_STRING ShortNameU,
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PUNICODE_STRING NameU)
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{
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PWCHAR PathNameBuffer;
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USHORT PathNameLength;
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PathNameLength = directoryFCB->PathNameU.Length + max(LongNameU->Length, ShortNameU->Length);
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if (!vfatFCBIsRoot(directoryFCB))
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{
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PathNameLength += sizeof(WCHAR);
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}
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if (PathNameLength > LONGNAME_MAX_LENGTH * sizeof(WCHAR))
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{
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return STATUS_OBJECT_NAME_INVALID;
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}
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PathNameBuffer = ExAllocatePoolWithTag(NonPagedPool, PathNameLength + sizeof(WCHAR), TAG_FCB);
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if (!PathNameBuffer)
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{
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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NameU->Buffer = PathNameBuffer;
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NameU->Length = 0;
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NameU->MaximumLength = PathNameLength;
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RtlCopyUnicodeString(NameU, &directoryFCB->PathNameU);
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if (!vfatFCBIsRoot(directoryFCB))
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{
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RtlAppendUnicodeToString(NameU, L"\\");
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}
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if (LongNameU->Length > 0)
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{
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RtlAppendUnicodeStringToString(NameU, LongNameU);
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}
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else
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{
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RtlAppendUnicodeStringToString(NameU, ShortNameU);
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}
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NameU->Buffer[NameU->Length / sizeof(WCHAR)] = 0;
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return STATUS_SUCCESS;
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}
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VOID
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vfatDestroyCCB(
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PVFATCCB pCcb)
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{
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if (pCcb->SearchPattern.Buffer)
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{
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ExFreePoolWithTag(pCcb->SearchPattern.Buffer, TAG_SEARCH);
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}
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ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, pCcb);
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}
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VOID
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vfatDestroyFCB(
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PVFATFCB pFCB)
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{
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#ifdef KDBG
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if (DebugFile.Buffer != NULL && FsRtlIsNameInExpression(&DebugFile, &pFCB->LongNameU, FALSE, NULL))
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{
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DPRINT1("Destroying: %p (%wZ) %d\n", pFCB, &pFCB->PathNameU, pFCB->RefCount);
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}
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#endif
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FsRtlUninitializeFileLock(&pFCB->FileLock);
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if (!vfatFCBIsRoot(pFCB) &&
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!BooleanFlagOn(pFCB->Flags, FCB_IS_FAT) && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME))
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{
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RemoveEntryList(&pFCB->ParentListEntry);
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}
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ExFreePool(pFCB->PathNameBuffer);
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ExDeleteResourceLite(&pFCB->PagingIoResource);
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ExDeleteResourceLite(&pFCB->MainResource);
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ASSERT(IsListEmpty(&pFCB->ParentListHead));
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ExFreeToNPagedLookasideList(&VfatGlobalData->FcbLookasideList, pFCB);
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}
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BOOLEAN
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vfatFCBIsRoot(
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PVFATFCB FCB)
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{
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return FCB->PathNameU.Length == sizeof(WCHAR) && FCB->PathNameU.Buffer[0] == L'\\' ? TRUE : FALSE;
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}
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VOID
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#ifndef KDBG
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vfatGrabFCB(
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#else
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_vfatGrabFCB(
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#endif
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PDEVICE_EXTENSION pVCB,
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PVFATFCB pFCB
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#ifdef KDBG
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,
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PCSTR File,
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ULONG Line,
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PCSTR Func
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#endif
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)
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{
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#ifdef KDBG
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if (DebugFile.Buffer != NULL && FsRtlIsNameInExpression(&DebugFile, &pFCB->LongNameU, FALSE, NULL))
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{
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DPRINT1("Inc ref count (%d, oc: %d) for: %p (%wZ) at: %s(%d) %s\n", pFCB->RefCount, pFCB->OpenHandleCount, pFCB, &pFCB->PathNameU, File, Line, Func);
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}
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#else
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DPRINT("Grabbing FCB at %p: %wZ, refCount:%d\n",
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pFCB, &pFCB->PathNameU, pFCB->RefCount);
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#endif
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ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
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ASSERT(!BooleanFlagOn(pFCB->Flags, FCB_IS_FAT));
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ASSERT(pFCB != pVCB->VolumeFcb && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME));
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ASSERT(pFCB->RefCount > 0);
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++pFCB->RefCount;
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}
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VOID
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#ifndef KDBG
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vfatReleaseFCB(
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#else
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_vfatReleaseFCB(
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#endif
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PDEVICE_EXTENSION pVCB,
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PVFATFCB pFCB
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#ifdef KDBG
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,
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PCSTR File,
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ULONG Line,
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PCSTR Func
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#endif
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)
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{
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PVFATFCB tmpFcb;
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#ifdef KDBG
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if (DebugFile.Buffer != NULL && FsRtlIsNameInExpression(&DebugFile, &pFCB->LongNameU, FALSE, NULL))
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{
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DPRINT1("Dec ref count (%d, oc: %d) for: %p (%wZ) at: %s(%d) %s\n", pFCB->RefCount, pFCB->OpenHandleCount, pFCB, &pFCB->PathNameU, File, Line, Func);
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}
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#else
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DPRINT("Releasing FCB at %p: %wZ, refCount:%d\n",
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pFCB, &pFCB->PathNameU, pFCB->RefCount);
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#endif
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ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
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while (pFCB)
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{
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ULONG RefCount;
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ASSERT(!BooleanFlagOn(pFCB->Flags, FCB_IS_FAT));
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ASSERT(pFCB != pVCB->VolumeFcb && !BooleanFlagOn(pFCB->Flags, FCB_IS_VOLUME));
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ASSERT(pFCB->RefCount > 0);
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RefCount = --pFCB->RefCount;
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if (RefCount == 1 && BooleanFlagOn(pFCB->Flags, FCB_CACHE_INITIALIZED))
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{
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PFILE_OBJECT tmpFileObject;
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tmpFileObject = pFCB->FileObject;
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pFCB->FileObject = NULL;
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CcUninitializeCacheMap(tmpFileObject, NULL, NULL);
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ClearFlag(pFCB->Flags, FCB_CACHE_INITIALIZED);
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ObDereferenceObject(tmpFileObject);
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}
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if (RefCount == 0)
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{
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ASSERT(pFCB->OpenHandleCount == 0);
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tmpFcb = pFCB->parentFcb;
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vfatDelFCBFromTable(pVCB, pFCB);
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vfatDestroyFCB(pFCB);
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}
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else
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{
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tmpFcb = NULL;
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}
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pFCB = tmpFcb;
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}
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}
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static
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VOID
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vfatAddFCBToTable(
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PDEVICE_EXTENSION pVCB,
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PVFATFCB pFCB)
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{
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ULONG Index;
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ULONG ShortIndex;
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ASSERT(pFCB->Hash.Hash == vfatNameHash(0, &pFCB->PathNameU));
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Index = pFCB->Hash.Hash % pVCB->HashTableSize;
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ShortIndex = pFCB->ShortHash.Hash % pVCB->HashTableSize;
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InsertTailList(&pVCB->FcbListHead, &pFCB->FcbListEntry);
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pFCB->Hash.next = pVCB->FcbHashTable[Index];
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pVCB->FcbHashTable[Index] = &pFCB->Hash;
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if (pFCB->Hash.Hash != pFCB->ShortHash.Hash)
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{
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pFCB->ShortHash.next = pVCB->FcbHashTable[ShortIndex];
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pVCB->FcbHashTable[ShortIndex] = &pFCB->ShortHash;
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}
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if (pFCB->parentFcb)
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{
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vfatGrabFCB(pVCB, pFCB->parentFcb);
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}
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}
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static
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VOID
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vfatInitFCBFromDirEntry(
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PDEVICE_EXTENSION Vcb,
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PVFATFCB ParentFcb,
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PVFATFCB Fcb,
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PVFAT_DIRENTRY_CONTEXT DirContext)
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{
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ULONG Size;
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RtlCopyMemory(&Fcb->entry, &DirContext->DirEntry, sizeof (DIR_ENTRY));
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RtlCopyUnicodeString(&Fcb->ShortNameU, &DirContext->ShortNameU);
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Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
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if (vfatVolumeIsFatX(Vcb))
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{
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Fcb->ShortHash.Hash = Fcb->Hash.Hash;
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}
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else
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{
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Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
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Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
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}
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if (vfatFCBIsDirectory(Fcb))
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{
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ULONG FirstCluster, CurrentCluster;
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NTSTATUS Status = STATUS_SUCCESS;
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Size = 0;
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FirstCluster = vfatDirEntryGetFirstCluster(Vcb, &Fcb->entry);
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if (FirstCluster == 1)
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{
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Size = Vcb->FatInfo.rootDirectorySectors * Vcb->FatInfo.BytesPerSector;
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}
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else if (FirstCluster != 0)
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{
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CurrentCluster = FirstCluster;
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while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
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{
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Size += Vcb->FatInfo.BytesPerCluster;
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Status = NextCluster(Vcb, FirstCluster, &CurrentCluster, FALSE);
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}
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}
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}
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else if (vfatVolumeIsFatX(Vcb))
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{
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Size = Fcb->entry.FatX.FileSize;
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}
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else
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{
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Size = Fcb->entry.Fat.FileSize;
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}
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Fcb->dirIndex = DirContext->DirIndex;
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Fcb->startIndex = DirContext->StartIndex;
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Fcb->parentFcb = ParentFcb;
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if (vfatVolumeIsFatX(Vcb) && !vfatFCBIsRoot(ParentFcb))
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{
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ASSERT(DirContext->DirIndex >= 2 && DirContext->StartIndex >= 2);
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Fcb->dirIndex = DirContext->DirIndex-2;
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Fcb->startIndex = DirContext->StartIndex-2;
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}
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Fcb->RFCB.FileSize.QuadPart = Size;
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Fcb->RFCB.ValidDataLength.QuadPart = Size;
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Fcb->RFCB.AllocationSize.QuadPart = ROUND_UP_64(Size, Vcb->FatInfo.BytesPerCluster);
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}
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|
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NTSTATUS
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vfatSetFCBNewDirName(
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PDEVICE_EXTENSION pVCB,
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PVFATFCB Fcb,
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PVFATFCB ParentFcb)
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|
{
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NTSTATUS Status;
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UNICODE_STRING NewNameU;
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/* Get full path name */
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|
Status = vfatMakeFullName(ParentFcb, &Fcb->LongNameU, &Fcb->ShortNameU, &NewNameU);
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|
if (!NT_SUCCESS(Status))
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{
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return Status;
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}
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|
|
/* Delete old name */
|
|
if (Fcb->PathNameBuffer)
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|
{
|
|
ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
|
|
}
|
|
Fcb->PathNameU = NewNameU;
|
|
|
|
/* Delete from table */
|
|
vfatDelFCBFromTable(pVCB, Fcb);
|
|
|
|
/* Split it properly */
|
|
Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
|
|
Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
|
|
vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
|
|
Fcb->Hash.Hash = vfatNameHash(0, &Fcb->PathNameU);
|
|
if (vfatVolumeIsFatX(pVCB))
|
|
{
|
|
Fcb->ShortHash.Hash = Fcb->Hash.Hash;
|
|
}
|
|
else
|
|
{
|
|
Fcb->ShortHash.Hash = vfatNameHash(0, &Fcb->DirNameU);
|
|
Fcb->ShortHash.Hash = vfatNameHash(Fcb->ShortHash.Hash, &Fcb->ShortNameU);
|
|
}
|
|
|
|
vfatAddFCBToTable(pVCB, Fcb);
|
|
vfatReleaseFCB(pVCB, ParentFcb);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
NTSTATUS
|
|
vfatUpdateFCB(
|
|
PDEVICE_EXTENSION pVCB,
|
|
PVFATFCB Fcb,
|
|
PVFAT_DIRENTRY_CONTEXT DirContext,
|
|
PVFATFCB ParentFcb)
|
|
{
|
|
NTSTATUS Status;
|
|
PVFATFCB OldParent;
|
|
|
|
DPRINT("vfatUpdateFCB(%p, %p, %p, %p)\n", pVCB, Fcb, DirContext, ParentFcb);
|
|
|
|
/* Get full path name */
|
|
Status = vfatMakeFullName(ParentFcb, &DirContext->LongNameU, &DirContext->ShortNameU, &Fcb->PathNameU);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
return Status;
|
|
}
|
|
|
|
/* Delete old name */
|
|
if (Fcb->PathNameBuffer)
|
|
{
|
|
ExFreePoolWithTag(Fcb->PathNameBuffer, TAG_FCB);
|
|
}
|
|
|
|
/* Delete from table */
|
|
vfatDelFCBFromTable(pVCB, Fcb);
|
|
|
|
/* Split it properly */
|
|
Fcb->PathNameBuffer = Fcb->PathNameU.Buffer;
|
|
Fcb->DirNameU.Buffer = Fcb->PathNameU.Buffer;
|
|
vfatSplitPathName(&Fcb->PathNameU, &Fcb->DirNameU, &Fcb->LongNameU);
|
|
|
|
/* Save old parent */
|
|
OldParent = Fcb->parentFcb;
|
|
RemoveEntryList(&Fcb->ParentListEntry);
|
|
|
|
/* Reinit FCB */
|
|
vfatInitFCBFromDirEntry(pVCB, ParentFcb, Fcb, DirContext);
|
|
|
|
if (vfatFCBIsDirectory(Fcb))
|
|
{
|
|
CcFlushCache(&Fcb->SectionObjectPointers, NULL, 0, NULL);
|
|
}
|
|
InsertTailList(&ParentFcb->ParentListHead, &Fcb->ParentListEntry);
|
|
vfatAddFCBToTable(pVCB, Fcb);
|
|
|
|
/* If we moved across directories, dereference our old parent
|
|
* We also dereference in case we're just renaming since AddFCBToTable references it
|
|
*/
|
|
vfatReleaseFCB(pVCB, OldParent);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
PVFATFCB
|
|
vfatGrabFCBFromTable(
|
|
PDEVICE_EXTENSION pVCB,
|
|
PUNICODE_STRING PathNameU)
|
|
{
|
|
PVFATFCB rcFCB;
|
|
ULONG Hash;
|
|
UNICODE_STRING DirNameU;
|
|
UNICODE_STRING FileNameU;
|
|
PUNICODE_STRING FcbNameU;
|
|
|
|
HASHENTRY* entry;
|
|
|
|
DPRINT("'%wZ'\n", PathNameU);
|
|
|
|
ASSERT(PathNameU->Length >= sizeof(WCHAR) && PathNameU->Buffer[0] == L'\\');
|
|
Hash = vfatNameHash(0, PathNameU);
|
|
|
|
entry = pVCB->FcbHashTable[Hash % pVCB->HashTableSize];
|
|
if (entry)
|
|
{
|
|
vfatSplitPathName(PathNameU, &DirNameU, &FileNameU);
|
|
}
|
|
|
|
while (entry)
|
|
{
|
|
if (entry->Hash == Hash)
|
|
{
|
|
rcFCB = entry->self;
|
|
DPRINT("'%wZ' '%wZ'\n", &DirNameU, &rcFCB->DirNameU);
|
|
if (RtlEqualUnicodeString(&DirNameU, &rcFCB->DirNameU, TRUE))
|
|
{
|
|
if (rcFCB->Hash.Hash == Hash)
|
|
{
|
|
FcbNameU = &rcFCB->LongNameU;
|
|
}
|
|
else
|
|
{
|
|
FcbNameU = &rcFCB->ShortNameU;
|
|
}
|
|
/* compare the file name */
|
|
DPRINT("'%wZ' '%wZ'\n", &FileNameU, FcbNameU);
|
|
if (RtlEqualUnicodeString(&FileNameU, FcbNameU, TRUE))
|
|
{
|
|
vfatGrabFCB(pVCB, rcFCB);
|
|
return rcFCB;
|
|
}
|
|
}
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
PVFATFCB
|
|
vfatMakeRootFCB(
|
|
PDEVICE_EXTENSION pVCB)
|
|
{
|
|
PVFATFCB FCB;
|
|
ULONG FirstCluster, CurrentCluster, Size = 0;
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
|
|
|
|
ASSERT(pVCB->RootFcb == NULL);
|
|
|
|
FCB = vfatNewFCB(pVCB, &NameU);
|
|
if (vfatVolumeIsFatX(pVCB))
|
|
{
|
|
memset(FCB->entry.FatX.Filename, ' ', 42);
|
|
FCB->entry.FatX.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
|
|
FCB->entry.FatX.Attrib = FILE_ATTRIBUTE_DIRECTORY;
|
|
FCB->entry.FatX.FirstCluster = 1;
|
|
Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
|
|
}
|
|
else
|
|
{
|
|
memset(FCB->entry.Fat.ShortName, ' ', 11);
|
|
FCB->entry.Fat.FileSize = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
|
|
FCB->entry.Fat.Attrib = FILE_ATTRIBUTE_DIRECTORY;
|
|
if (pVCB->FatInfo.FatType == FAT32)
|
|
{
|
|
CurrentCluster = FirstCluster = pVCB->FatInfo.RootCluster;
|
|
FCB->entry.Fat.FirstCluster = (unsigned short)(FirstCluster & 0xffff);
|
|
FCB->entry.Fat.FirstClusterHigh = (unsigned short)(FirstCluster >> 16);
|
|
|
|
while (CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
|
|
{
|
|
Size += pVCB->FatInfo.BytesPerCluster;
|
|
Status = NextCluster (pVCB, FirstCluster, &CurrentCluster, FALSE);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
FCB->entry.Fat.FirstCluster = 1;
|
|
Size = pVCB->FatInfo.rootDirectorySectors * pVCB->FatInfo.BytesPerSector;
|
|
}
|
|
}
|
|
FCB->ShortHash.Hash = FCB->Hash.Hash;
|
|
FCB->RefCount = 2;
|
|
FCB->dirIndex = 0;
|
|
FCB->RFCB.FileSize.QuadPart = Size;
|
|
FCB->RFCB.ValidDataLength.QuadPart = Size;
|
|
FCB->RFCB.AllocationSize.QuadPart = Size;
|
|
FCB->RFCB.IsFastIoPossible = FastIoIsNotPossible;
|
|
|
|
vfatFCBInitializeCacheFromVolume(pVCB, FCB);
|
|
vfatAddFCBToTable(pVCB, FCB);
|
|
|
|
/* Cache it */
|
|
pVCB->RootFcb = FCB;
|
|
|
|
return FCB;
|
|
}
|
|
|
|
PVFATFCB
|
|
vfatOpenRootFCB(
|
|
PDEVICE_EXTENSION pVCB)
|
|
{
|
|
PVFATFCB FCB;
|
|
UNICODE_STRING NameU = RTL_CONSTANT_STRING(L"\\");
|
|
|
|
FCB = vfatGrabFCBFromTable(pVCB, &NameU);
|
|
if (FCB == NULL)
|
|
{
|
|
FCB = vfatMakeRootFCB(pVCB);
|
|
}
|
|
ASSERT(FCB == pVCB->RootFcb);
|
|
|
|
return FCB;
|
|
}
|
|
|
|
NTSTATUS
|
|
vfatMakeFCBFromDirEntry(
|
|
PVCB vcb,
|
|
PVFATFCB directoryFCB,
|
|
PVFAT_DIRENTRY_CONTEXT DirContext,
|
|
PVFATFCB *fileFCB)
|
|
{
|
|
PVFATFCB rcFCB;
|
|
UNICODE_STRING NameU;
|
|
NTSTATUS Status;
|
|
|
|
Status = vfatMakeFullName(directoryFCB, &DirContext->LongNameU, &DirContext->ShortNameU, &NameU);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
return Status;
|
|
}
|
|
|
|
rcFCB = vfatNewFCB(vcb, &NameU);
|
|
vfatInitFCBFromDirEntry(vcb, directoryFCB, rcFCB, DirContext);
|
|
|
|
rcFCB->RefCount = 1;
|
|
InsertTailList(&directoryFCB->ParentListHead, &rcFCB->ParentListEntry);
|
|
vfatAddFCBToTable(vcb, rcFCB);
|
|
*fileFCB = rcFCB;
|
|
|
|
ExFreePoolWithTag(NameU.Buffer, TAG_FCB);
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
NTSTATUS
|
|
vfatAttachFCBToFileObject(
|
|
PDEVICE_EXTENSION vcb,
|
|
PVFATFCB fcb,
|
|
PFILE_OBJECT fileObject)
|
|
{
|
|
PVFATCCB newCCB;
|
|
|
|
#ifdef KDBG
|
|
if (DebugFile.Buffer != NULL && FsRtlIsNameInExpression(&DebugFile, &fcb->LongNameU, FALSE, NULL))
|
|
{
|
|
DPRINT1("Attaching %p to %p (%d)\n", fcb, fileObject, fcb->RefCount);
|
|
}
|
|
#endif
|
|
|
|
newCCB = ExAllocateFromNPagedLookasideList(&VfatGlobalData->CcbLookasideList);
|
|
if (newCCB == NULL)
|
|
{
|
|
return STATUS_INSUFFICIENT_RESOURCES;
|
|
}
|
|
RtlZeroMemory(newCCB, sizeof (VFATCCB));
|
|
|
|
fileObject->SectionObjectPointer = &fcb->SectionObjectPointers;
|
|
fileObject->FsContext = fcb;
|
|
fileObject->FsContext2 = newCCB;
|
|
fileObject->Vpb = vcb->IoVPB;
|
|
DPRINT("file open: fcb:%p PathName:%wZ\n", fcb, &fcb->PathNameU);
|
|
|
|
#ifdef KDBG
|
|
fcb->Flags &= ~FCB_CLEANED_UP;
|
|
fcb->Flags &= ~FCB_CLOSED;
|
|
#endif
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
NTSTATUS
|
|
vfatDirFindFile(
|
|
PDEVICE_EXTENSION pDeviceExt,
|
|
PVFATFCB pDirectoryFCB,
|
|
PUNICODE_STRING FileToFindU,
|
|
PVFATFCB *pFoundFCB)
|
|
{
|
|
NTSTATUS status;
|
|
PVOID Context = NULL;
|
|
PVOID Page = NULL;
|
|
BOOLEAN First = TRUE;
|
|
VFAT_DIRENTRY_CONTEXT DirContext;
|
|
/* This buffer must have a size of 260 characters, because
|
|
vfatMakeFCBFromDirEntry can copy 20 name entries with 13 characters. */
|
|
WCHAR LongNameBuffer[260];
|
|
WCHAR ShortNameBuffer[13];
|
|
BOOLEAN FoundLong = FALSE;
|
|
BOOLEAN FoundShort = FALSE;
|
|
BOOLEAN IsFatX = vfatVolumeIsFatX(pDeviceExt);
|
|
|
|
ASSERT(pDeviceExt);
|
|
ASSERT(pDirectoryFCB);
|
|
ASSERT(FileToFindU);
|
|
|
|
DPRINT("vfatDirFindFile(VCB:%p, dirFCB:%p, File:%wZ)\n",
|
|
pDeviceExt, pDirectoryFCB, FileToFindU);
|
|
DPRINT("Dir Path:%wZ\n", &pDirectoryFCB->PathNameU);
|
|
|
|
DirContext.DirIndex = 0;
|
|
DirContext.LongNameU.Buffer = LongNameBuffer;
|
|
DirContext.LongNameU.Length = 0;
|
|
DirContext.LongNameU.MaximumLength = sizeof(LongNameBuffer);
|
|
DirContext.ShortNameU.Buffer = ShortNameBuffer;
|
|
DirContext.ShortNameU.Length = 0;
|
|
DirContext.ShortNameU.MaximumLength = sizeof(ShortNameBuffer);
|
|
DirContext.DeviceExt = pDeviceExt;
|
|
|
|
while (TRUE)
|
|
{
|
|
status = VfatGetNextDirEntry(pDeviceExt,
|
|
&Context,
|
|
&Page,
|
|
pDirectoryFCB,
|
|
&DirContext,
|
|
First);
|
|
First = FALSE;
|
|
if (status == STATUS_NO_MORE_ENTRIES)
|
|
{
|
|
return STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
if (!NT_SUCCESS(status))
|
|
{
|
|
return status;
|
|
}
|
|
|
|
DPRINT(" Index:%u longName:%wZ\n",
|
|
DirContext.DirIndex, &DirContext.LongNameU);
|
|
|
|
if (!ENTRY_VOLUME(IsFatX, &DirContext.DirEntry))
|
|
{
|
|
if (DirContext.LongNameU.Length == 0 ||
|
|
DirContext.ShortNameU.Length == 0)
|
|
{
|
|
DPRINT1("WARNING: File system corruption detected. You may need to run a disk repair utility.\n");
|
|
if (VfatGlobalData->Flags & VFAT_BREAK_ON_CORRUPTION)
|
|
{
|
|
ASSERT(DirContext.LongNameU.Length != 0 &&
|
|
DirContext.ShortNameU.Length != 0);
|
|
}
|
|
DirContext.DirIndex++;
|
|
continue;
|
|
}
|
|
FoundLong = RtlEqualUnicodeString(FileToFindU, &DirContext.LongNameU, TRUE);
|
|
if (FoundLong == FALSE)
|
|
{
|
|
FoundShort = RtlEqualUnicodeString(FileToFindU, &DirContext.ShortNameU, TRUE);
|
|
}
|
|
if (FoundLong || FoundShort)
|
|
{
|
|
status = vfatMakeFCBFromDirEntry(pDeviceExt,
|
|
pDirectoryFCB,
|
|
&DirContext,
|
|
pFoundFCB);
|
|
CcUnpinData(Context);
|
|
return status;
|
|
}
|
|
}
|
|
DirContext.DirIndex++;
|
|
}
|
|
|
|
return STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
|
|
NTSTATUS
|
|
vfatGetFCBForFile(
|
|
PDEVICE_EXTENSION pVCB,
|
|
PVFATFCB *pParentFCB,
|
|
PVFATFCB *pFCB,
|
|
PUNICODE_STRING pFileNameU)
|
|
{
|
|
NTSTATUS status;
|
|
PVFATFCB FCB = NULL;
|
|
PVFATFCB parentFCB;
|
|
UNICODE_STRING NameU;
|
|
UNICODE_STRING RootNameU = RTL_CONSTANT_STRING(L"\\");
|
|
UNICODE_STRING FileNameU;
|
|
WCHAR NameBuffer[260];
|
|
PWCHAR curr, prev, last;
|
|
ULONG Length;
|
|
|
|
DPRINT("vfatGetFCBForFile (%p,%p,%p,%wZ)\n",
|
|
pVCB, pParentFCB, pFCB, pFileNameU);
|
|
|
|
RtlInitEmptyUnicodeString(&FileNameU, NameBuffer, sizeof(NameBuffer));
|
|
|
|
parentFCB = *pParentFCB;
|
|
|
|
if (parentFCB == NULL)
|
|
{
|
|
/* Passed-in name is the full name */
|
|
RtlCopyUnicodeString(&FileNameU, pFileNameU);
|
|
|
|
// Trivial case, open of the root directory on volume
|
|
if (RtlEqualUnicodeString(&FileNameU, &RootNameU, FALSE))
|
|
{
|
|
DPRINT("returning root FCB\n");
|
|
|
|
FCB = vfatOpenRootFCB(pVCB);
|
|
*pFCB = FCB;
|
|
*pParentFCB = NULL;
|
|
|
|
return (FCB != NULL) ? STATUS_SUCCESS : STATUS_OBJECT_PATH_NOT_FOUND;
|
|
}
|
|
|
|
/* Check for an existing FCB */
|
|
FCB = vfatGrabFCBFromTable(pVCB, &FileNameU);
|
|
if (FCB)
|
|
{
|
|
*pFCB = FCB;
|
|
*pParentFCB = FCB->parentFcb;
|
|
vfatGrabFCB(pVCB, *pParentFCB);
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
last = curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
|
|
while (*curr != L'\\' && curr > FileNameU.Buffer)
|
|
{
|
|
curr--;
|
|
}
|
|
|
|
if (curr > FileNameU.Buffer)
|
|
{
|
|
NameU.Buffer = FileNameU.Buffer;
|
|
NameU.MaximumLength = NameU.Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
|
|
FCB = vfatGrabFCBFromTable(pVCB, &NameU);
|
|
if (FCB)
|
|
{
|
|
Length = (curr - FileNameU.Buffer) * sizeof(WCHAR);
|
|
if (Length != FCB->PathNameU.Length)
|
|
{
|
|
if (FileNameU.Length + FCB->PathNameU.Length - Length > FileNameU.MaximumLength)
|
|
{
|
|
vfatReleaseFCB(pVCB, FCB);
|
|
return STATUS_OBJECT_NAME_INVALID;
|
|
}
|
|
RtlMoveMemory(FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR),
|
|
curr, FileNameU.Length - Length);
|
|
FileNameU.Length += (USHORT)(FCB->PathNameU.Length - Length);
|
|
curr = FileNameU.Buffer + FCB->PathNameU.Length / sizeof(WCHAR);
|
|
last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
|
|
}
|
|
RtlCopyMemory(FileNameU.Buffer, FCB->PathNameU.Buffer, FCB->PathNameU.Length);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
FCB = NULL;
|
|
}
|
|
|
|
if (FCB == NULL)
|
|
{
|
|
FCB = vfatOpenRootFCB(pVCB);
|
|
curr = FileNameU.Buffer;
|
|
}
|
|
|
|
parentFCB = NULL;
|
|
prev = curr;
|
|
}
|
|
else
|
|
{
|
|
/* Make absolute path */
|
|
RtlCopyUnicodeString(&FileNameU, &parentFCB->PathNameU);
|
|
curr = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
|
|
if (*curr != L'\\')
|
|
{
|
|
RtlAppendUnicodeToString(&FileNameU, L"\\");
|
|
curr++;
|
|
}
|
|
ASSERT(*curr == L'\\');
|
|
RtlAppendUnicodeStringToString(&FileNameU, pFileNameU);
|
|
|
|
FCB = parentFCB;
|
|
parentFCB = NULL;
|
|
prev = curr;
|
|
last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
|
|
}
|
|
|
|
while (curr <= last)
|
|
{
|
|
if (parentFCB)
|
|
{
|
|
vfatReleaseFCB(pVCB, parentFCB);
|
|
parentFCB = NULL;
|
|
}
|
|
// fail if element in FCB is not a directory
|
|
if (!vfatFCBIsDirectory(FCB))
|
|
{
|
|
DPRINT ("Element in requested path is not a directory\n");
|
|
|
|
vfatReleaseFCB(pVCB, FCB);
|
|
FCB = NULL;
|
|
*pParentFCB = NULL;
|
|
*pFCB = NULL;
|
|
|
|
return STATUS_OBJECT_PATH_NOT_FOUND;
|
|
}
|
|
parentFCB = FCB;
|
|
if (prev < curr)
|
|
{
|
|
Length = (curr - prev) * sizeof(WCHAR);
|
|
if (Length != parentFCB->LongNameU.Length)
|
|
{
|
|
if (FileNameU.Length + parentFCB->LongNameU.Length - Length > FileNameU.MaximumLength)
|
|
{
|
|
vfatReleaseFCB(pVCB, parentFCB);
|
|
*pParentFCB = NULL;
|
|
*pFCB = NULL;
|
|
return STATUS_OBJECT_NAME_INVALID;
|
|
}
|
|
RtlMoveMemory(prev + parentFCB->LongNameU.Length / sizeof(WCHAR), curr,
|
|
FileNameU.Length - (curr - FileNameU.Buffer) * sizeof(WCHAR));
|
|
FileNameU.Length += (USHORT)(parentFCB->LongNameU.Length - Length);
|
|
curr = prev + parentFCB->LongNameU.Length / sizeof(WCHAR);
|
|
last = FileNameU.Buffer + FileNameU.Length / sizeof(WCHAR) - 1;
|
|
}
|
|
RtlCopyMemory(prev, parentFCB->LongNameU.Buffer, parentFCB->LongNameU.Length);
|
|
}
|
|
curr++;
|
|
prev = curr;
|
|
while (*curr != L'\\' && curr <= last)
|
|
{
|
|
curr++;
|
|
}
|
|
NameU.Buffer = FileNameU.Buffer;
|
|
NameU.Length = (curr - NameU.Buffer) * sizeof(WCHAR);
|
|
NameU.MaximumLength = FileNameU.MaximumLength;
|
|
DPRINT("%wZ\n", &NameU);
|
|
FCB = vfatGrabFCBFromTable(pVCB, &NameU);
|
|
if (FCB == NULL)
|
|
{
|
|
NameU.Buffer = prev;
|
|
NameU.MaximumLength = NameU.Length = (curr - prev) * sizeof(WCHAR);
|
|
status = vfatDirFindFile(pVCB, parentFCB, &NameU, &FCB);
|
|
if (status == STATUS_OBJECT_NAME_NOT_FOUND)
|
|
{
|
|
*pFCB = NULL;
|
|
if (curr > last)
|
|
{
|
|
*pParentFCB = parentFCB;
|
|
return STATUS_OBJECT_NAME_NOT_FOUND;
|
|
}
|
|
else
|
|
{
|
|
vfatReleaseFCB(pVCB, parentFCB);
|
|
*pParentFCB = NULL;
|
|
return STATUS_OBJECT_PATH_NOT_FOUND;
|
|
}
|
|
}
|
|
else if (!NT_SUCCESS(status))
|
|
{
|
|
vfatReleaseFCB(pVCB, parentFCB);
|
|
*pParentFCB = NULL;
|
|
*pFCB = NULL;
|
|
|
|
return status;
|
|
}
|
|
}
|
|
}
|
|
|
|
*pParentFCB = parentFCB;
|
|
*pFCB = FCB;
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|