/*
* ReactOS kernel
- * Copyright (C) 2002 ReactOS Team
+ * Copyright (C) 2002, 2014 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* PROJECT: ReactOS kernel
* FILE: drivers/filesystem/ntfs/mft.c
* PURPOSE: NTFS filesystem driver
- * PROGRAMMER: Eric Kohl
- * Updated by Valentin Verkhovsky 2003/09/12
+ * PROGRAMMERS: Eric Kohl
+ * Valentin Verkhovsky
+ * Pierre Schweitzer (pierre@reactos.org)
+ * Hervé Poussineau (hpoussin@reactos.org)
*/
/* INCLUDES *****************************************************************/
/* FUNCTIONS ****************************************************************/
-NTSTATUS
-NtfsOpenMft(PDEVICE_EXTENSION Vcb)
+PNTFS_ATTR_CONTEXT
+PrepareAttributeContext(PNTFS_ATTR_RECORD AttrRecord)
{
-// PVOID Bitmap;
- PFILE_RECORD_HEADER MftRecord;
- PFILE_RECORD_HEADER FileRecord;
-// PATTRIBUTE Attribute;
-// PATTRIBUTE AttrData;
-// PRESIDENT_ATTRIBUTE ResAttr;
+ PNTFS_ATTR_CONTEXT Context;
- NTSTATUS Status;
- ULONG BytesPerFileRecord;
- ULONG n;
- ULONG i;
+ Context = ExAllocatePoolWithTag(NonPagedPool,
+ FIELD_OFFSET(NTFS_ATTR_CONTEXT, Record) + AttrRecord->Length,
+ TAG_NTFS);
+ RtlCopyMemory(&Context->Record, AttrRecord, AttrRecord->Length);
+ if (AttrRecord->IsNonResident)
+ {
+ LONGLONG DataRunOffset;
+ ULONGLONG DataRunLength;
+
+ Context->CacheRun = (PUCHAR)&Context->Record + Context->Record.NonResident.MappingPairsOffset;
+ Context->CacheRunOffset = 0;
+ Context->CacheRun = DecodeRun(Context->CacheRun, &DataRunOffset, &DataRunLength);
+ Context->CacheRunLength = DataRunLength;
+ if (DataRunOffset != -1)
+ {
+ /* Normal run. */
+ Context->CacheRunStartLCN =
+ Context->CacheRunLastLCN = DataRunOffset;
+ }
+ else
+ {
+ /* Sparse run. */
+ Context->CacheRunStartLCN = -1;
+ Context->CacheRunLastLCN = 0;
+ }
+ Context->CacheRunCurrentOffset = 0;
+ }
- DPRINT1("NtfsOpenMft() called\n");
+ return Context;
+}
- BytesPerFileRecord = Vcb->NtfsInfo.BytesPerFileRecord;
- MftRecord = ExAllocatePoolWithTag(NonPagedPool,
- BytesPerFileRecord,
- TAG_NTFS);
- if (MftRecord == NULL)
+VOID
+ReleaseAttributeContext(PNTFS_ATTR_CONTEXT Context)
+{
+ ExFreePoolWithTag(Context, TAG_NTFS);
+}
+
+
+NTSTATUS
+FindAttribute(PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER MftRecord,
+ ULONG Type,
+ PCWSTR Name,
+ ULONG NameLength,
+ PNTFS_ATTR_CONTEXT * AttrCtx)
+{
+ BOOLEAN Found;
+ NTSTATUS Status;
+ FIND_ATTR_CONTXT Context;
+ PNTFS_ATTR_RECORD Attribute;
+
+ DPRINT("FindAttribute(%p, %p, 0x%x, %S, %u, %p)\n", Vcb, MftRecord, Type, Name, NameLength, AttrCtx);
+
+ Found = FALSE;
+ Status = FindFirstAttribute(&Context, Vcb, MftRecord, FALSE, &Attribute);
+ while (NT_SUCCESS(Status))
{
- return STATUS_INSUFFICIENT_RESOURCES;
+ if (Attribute->Type == Type && Attribute->NameLength == NameLength)
+ {
+ if (NameLength != 0)
+ {
+ PWCHAR AttrName;
+
+ AttrName = (PWCHAR)((PCHAR)Attribute + Attribute->NameOffset);
+ DPRINT("%.*S, %.*S\n", Attribute->NameLength, AttrName, NameLength, Name);
+ if (RtlCompareMemory(AttrName, Name, NameLength << 1) == (NameLength << 1))
+ {
+ Found = TRUE;
+ }
+ }
+ else
+ {
+ Found = TRUE;
+ }
+
+ if (Found)
+ {
+ /* Found it, fill up the context and return. */
+ DPRINT("Found context\n");
+ *AttrCtx = PrepareAttributeContext(Attribute);
+ FindCloseAttribute(&Context);
+ return STATUS_SUCCESS;
+ }
+ }
+
+ Status = FindNextAttribute(&Context, &Attribute);
}
- Status = NtfsReadSectors(Vcb->StorageDevice,
- Vcb->NtfsInfo.MftStart.u.LowPart * Vcb->NtfsInfo.SectorsPerCluster,
- BytesPerFileRecord / Vcb->NtfsInfo.BytesPerSector,
- Vcb->NtfsInfo.BytesPerSector,
- (PVOID)MftRecord,
- FALSE);
- if (!NT_SUCCESS(Status))
+ FindCloseAttribute(&Context);
+ return STATUS_OBJECT_NAME_NOT_FOUND;
+}
+
+
+ULONG
+AttributeAllocatedLength(PNTFS_ATTR_RECORD AttrRecord)
+{
+ if (AttrRecord->IsNonResident)
+ return AttrRecord->NonResident.AllocatedSize;
+ else
+ return AttrRecord->Resident.ValueLength;
+}
+
+
+ULONGLONG
+AttributeDataLength(PNTFS_ATTR_RECORD AttrRecord)
+{
+ if (AttrRecord->IsNonResident)
+ return AttrRecord->NonResident.DataSize;
+ else
+ return AttrRecord->Resident.ValueLength;
+}
+
+
+ULONG
+ReadAttribute(PDEVICE_EXTENSION Vcb,
+ PNTFS_ATTR_CONTEXT Context,
+ ULONGLONG Offset,
+ PCHAR Buffer,
+ ULONG Length)
+{
+ ULONGLONG LastLCN;
+ PUCHAR DataRun;
+ LONGLONG DataRunOffset;
+ ULONGLONG DataRunLength;
+ LONGLONG DataRunStartLCN;
+ ULONGLONG CurrentOffset;
+ ULONG ReadLength;
+ ULONG AlreadyRead;
+ NTSTATUS Status;
+
+ if (!Context->Record.IsNonResident)
{
- ExFreePool(MftRecord);
- return Status;
+ if (Offset > Context->Record.Resident.ValueLength)
+ return 0;
+ if (Offset + Length > Context->Record.Resident.ValueLength)
+ Length = (ULONG)(Context->Record.Resident.ValueLength - Offset);
+ RtlCopyMemory(Buffer, (PCHAR)&Context->Record + Context->Record.Resident.ValueOffset + Offset, Length);
+ return Length;
}
- FixupUpdateSequenceArray(MftRecord);
+ /*
+ * Non-resident attribute
+ */
-// Attribute = FindAttribute(MftRecord, AttributeBitmap, 0);
+ /*
+ * I. Find the corresponding start data run.
+ */
- /* Get number of file records*/
- n = AttributeDataLength(FindAttribute(MftRecord, AttributeData, 0)) / BytesPerFileRecord;
+ AlreadyRead = 0;
- FileRecord = ExAllocatePoolWithTag(NonPagedPool,
- BytesPerFileRecord,
- TAG_NTFS);
- if (FileRecord == NULL)
+ // FIXME: Cache seems to be non-working. Disable it for now
+ //if(Context->CacheRunOffset <= Offset && Offset < Context->CacheRunOffset + Context->CacheRunLength * Volume->ClusterSize)
+ if (0)
{
- ExFreePool(MftRecord);
- return STATUS_INSUFFICIENT_RESOURCES;
+ DataRun = Context->CacheRun;
+ LastLCN = Context->CacheRunLastLCN;
+ DataRunStartLCN = Context->CacheRunStartLCN;
+ DataRunLength = Context->CacheRunLength;
+ CurrentOffset = Context->CacheRunCurrentOffset;
}
-
- /* Enumerate MFT Records */
- DPRINT("Enumerate MFT records\n");
- for (i = 0; i < n; i++)
+ else
{
- ReadFileRecord(Vcb,
- i,
- FileRecord,
- MftRecord);
+ LastLCN = 0;
+ DataRun = (PUCHAR)&Context->Record + Context->Record.NonResident.MappingPairsOffset;
+ CurrentOffset = 0;
- if (FileRecord->Ntfs.Type == NRH_FILE_TYPE &&
- (FileRecord->Flags & FRH_IN_USE))
+ while (1)
{
- DPRINT("\nFile %lu\n\n", i);
-
- /* Enumerate attributtes */
- NtfsDumpFileAttributes (FileRecord);
- DbgPrint("\n\n");
+ DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
+ if (DataRunOffset != -1)
+ {
+ /* Normal data run. */
+ DataRunStartLCN = LastLCN + DataRunOffset;
+ LastLCN = DataRunStartLCN;
+ }
+ else
+ {
+ /* Sparse data run. */
+ DataRunStartLCN = -1;
+ }
+
+ if (Offset >= CurrentOffset &&
+ Offset < CurrentOffset + (DataRunLength * Vcb->NtfsInfo.BytesPerCluster))
+ {
+ break;
+ }
+
+ if (*DataRun == 0)
+ {
+ return AlreadyRead;
+ }
+
+ CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
}
}
- ExFreePool(FileRecord);
- ExFreePool(MftRecord);
+ /*
+ * II. Go through the run list and read the data
+ */
- return Status;
+ ReadLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset), Length);
+ if (DataRunStartLCN == -1)
+ {
+ RtlZeroMemory(Buffer, ReadLength);
+ Status = STATUS_SUCCESS;
+ }
+ else
+ {
+ Status = NtfsReadDisk(Vcb->StorageDevice,
+ DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster + Offset - CurrentOffset,
+ ReadLength,
+ Vcb->NtfsInfo.BytesPerSector,
+ (PVOID)Buffer,
+ FALSE);
+ }
+ if (NT_SUCCESS(Status))
+ {
+ Length -= ReadLength;
+ Buffer += ReadLength;
+ AlreadyRead += ReadLength;
+
+ if (ReadLength == DataRunLength * Vcb->NtfsInfo.BytesPerCluster - (Offset - CurrentOffset))
+ {
+ CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
+ DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
+ if (DataRunOffset != (ULONGLONG)-1)
+ {
+ DataRunStartLCN = LastLCN + DataRunOffset;
+ LastLCN = DataRunStartLCN;
+ }
+ else
+ DataRunStartLCN = -1;
+ }
+
+ while (Length > 0)
+ {
+ ReadLength = (ULONG)min(DataRunLength * Vcb->NtfsInfo.BytesPerCluster, Length);
+ if (DataRunStartLCN == -1)
+ RtlZeroMemory(Buffer, ReadLength);
+ else
+ {
+ Status = NtfsReadDisk(Vcb->StorageDevice,
+ DataRunStartLCN * Vcb->NtfsInfo.BytesPerCluster,
+ ReadLength,
+ Vcb->NtfsInfo.BytesPerSector,
+ (PVOID)Buffer,
+ FALSE);
+ if (!NT_SUCCESS(Status))
+ break;
+ }
+
+ Length -= ReadLength;
+ Buffer += ReadLength;
+ AlreadyRead += ReadLength;
+
+ /* We finished this request, but there still data in this data run. */
+ if (Length == 0 && ReadLength != DataRunLength * Vcb->NtfsInfo.BytesPerCluster)
+ break;
+
+ /*
+ * Go to next run in the list.
+ */
+
+ if (*DataRun == 0)
+ break;
+ CurrentOffset += DataRunLength * Vcb->NtfsInfo.BytesPerCluster;
+ DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
+ if (DataRunOffset != -1)
+ {
+ /* Normal data run. */
+ DataRunStartLCN = LastLCN + DataRunOffset;
+ LastLCN = DataRunStartLCN;
+ }
+ else
+ {
+ /* Sparse data run. */
+ DataRunStartLCN = -1;
+ }
+ } /* while */
+
+ } /* if Disk */
+
+ Context->CacheRun = DataRun;
+ Context->CacheRunOffset = Offset + AlreadyRead;
+ Context->CacheRunStartLCN = DataRunStartLCN;
+ Context->CacheRunLength = DataRunLength;
+ Context->CacheRunLastLCN = LastLCN;
+ Context->CacheRunCurrentOffset = CurrentOffset;
+
+ return AlreadyRead;
}
-PATTRIBUTE
-FindAttribute(PFILE_RECORD_HEADER FileRecord,
- ATTRIBUTE_TYPE Type,
- PWSTR name)
+NTSTATUS
+ReadFileRecord(PDEVICE_EXTENSION Vcb,
+ ULONGLONG index,
+ PFILE_RECORD_HEADER file)
{
- PATTRIBUTE Attribute;
+ ULONGLONG BytesRead;
- UNREFERENCED_PARAMETER(name);
+ DPRINT("ReadFileRecord(%p, %I64x, %p)\n", Vcb, index, file);
- Attribute = (PATTRIBUTE)((ULONG_PTR)FileRecord + FileRecord->AttributeOffset);
- while (Attribute < (PATTRIBUTE)((ULONG_PTR)FileRecord + FileRecord->BytesInUse) &&
- Attribute->AttributeType != (ATTRIBUTE_TYPE)-1)
+ BytesRead = ReadAttribute(Vcb, Vcb->MFTContext, index * Vcb->NtfsInfo.BytesPerFileRecord, (PCHAR)file, Vcb->NtfsInfo.BytesPerFileRecord);
+ if (BytesRead != Vcb->NtfsInfo.BytesPerFileRecord)
{
- if (Attribute->AttributeType == Type)
- {
- return Attribute;
- }
-
- Attribute = (PATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Length);
+ DPRINT1("ReadFileRecord failed: %I64u read, %u expected\n", BytesRead, Vcb->NtfsInfo.BytesPerFileRecord);
+ return STATUS_PARTIAL_COPY;
}
- return NULL;
+ /* Apply update sequence array fixups. */
+ return FixupUpdateSequenceArray(Vcb, &file->Ntfs);
}
-ULONG
-AttributeAllocatedLength(PATTRIBUTE Attribute)
+NTSTATUS
+FixupUpdateSequenceArray(PDEVICE_EXTENSION Vcb,
+ PNTFS_RECORD_HEADER Record)
{
- if (Attribute->Nonresident)
+ USHORT *USA;
+ USHORT USANumber;
+ USHORT USACount;
+ USHORT *Block;
+
+ USA = (USHORT*)((PCHAR)Record + Record->UsaOffset);
+ USANumber = *(USA++);
+ USACount = Record->UsaCount - 1; /* Exclude the USA Number. */
+ Block = (USHORT*)((PCHAR)Record + Vcb->NtfsInfo.BytesPerSector - 2);
+
+ while (USACount)
{
- return ((PNONRESIDENT_ATTRIBUTE)Attribute)->AllocatedSize;
+ if (*Block != USANumber)
+ {
+ DPRINT1("Mismatch with USA: %u read, %u expected\n" , *Block, USANumber);
+ return STATUS_UNSUCCESSFUL;
+ }
+ *Block = *(USA++);
+ Block = (USHORT*)((PCHAR)Block + Vcb->NtfsInfo.BytesPerSector);
+ USACount--;
}
- return ((PRESIDENT_ATTRIBUTE)Attribute)->ValueLength;
+ return STATUS_SUCCESS;
}
-ULONG
-AttributeDataLength(PATTRIBUTE Attribute)
+NTSTATUS
+ReadLCN(PDEVICE_EXTENSION Vcb,
+ ULONGLONG lcn,
+ ULONG count,
+ PVOID buffer)
{
- if (Attribute->Nonresident)
- {
- return ((PNONRESIDENT_ATTRIBUTE)Attribute)->DataSize;
- }
+ LARGE_INTEGER DiskSector;
+
+ DiskSector.QuadPart = lcn;
- return ((PRESIDENT_ATTRIBUTE)Attribute)->ValueLength;
+ return NtfsReadSectors(Vcb->StorageDevice,
+ DiskSector.u.LowPart * Vcb->NtfsInfo.SectorsPerCluster,
+ count * Vcb->NtfsInfo.SectorsPerCluster,
+ Vcb->NtfsInfo.BytesPerSector,
+ buffer,
+ FALSE);
}
-VOID
-ReadAttribute(PATTRIBUTE attr,
- PVOID buffer,
- PDEVICE_EXTENSION Vcb,
- PDEVICE_OBJECT DeviceObject)
+BOOLEAN
+CompareFileName(PUNICODE_STRING FileName,
+ PINDEX_ENTRY_ATTRIBUTE IndexEntry,
+ BOOLEAN DirSearch)
{
- PNONRESIDENT_ATTRIBUTE NresAttr = (PNONRESIDENT_ATTRIBUTE)attr;
+ BOOLEAN Ret, Alloc = FALSE;
+ UNICODE_STRING EntryName;
- UNREFERENCED_PARAMETER(DeviceObject);
+ EntryName.Buffer = IndexEntry->FileName.Name;
+ EntryName.Length =
+ EntryName.MaximumLength = IndexEntry->FileName.NameLength * sizeof(WCHAR);
- if (attr->Nonresident == FALSE)
+ if (DirSearch)
{
- memcpy(buffer,
- (PVOID)((ULONG_PTR)attr + ((PRESIDENT_ATTRIBUTE)attr)->ValueOffset),
- ((PRESIDENT_ATTRIBUTE)attr)->ValueLength);
- }
+ UNICODE_STRING IntFileName;
+ if (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX)
+ {
+ NT_VERIFY(NT_SUCCESS(RtlUpcaseUnicodeString(&IntFileName, FileName, TRUE)));
+ Alloc = TRUE;
+ }
+ else
+ {
+ IntFileName = *FileName;
+ }
- ReadExternalAttribute(Vcb,
- NresAttr,
- 0,
- (ULONG)(NresAttr->LastVcn) + 1,
- buffer);
+ Ret = FsRtlIsNameInExpression(&IntFileName, &EntryName, (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX), NULL);
+
+ if (Alloc)
+ {
+ RtlFreeUnicodeString(&IntFileName);
+ }
+
+ return Ret;
+ }
+ else
+ {
+ return (RtlCompareUnicodeString(FileName, &EntryName, (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX)) == 0);
+ }
}
+#if 0
+static
+VOID
+DumpIndexEntry(PINDEX_ENTRY_ATTRIBUTE IndexEntry)
+{
+ DPRINT1("Entry: %p\n", IndexEntry);
+ DPRINT1("\tData.Directory.IndexedFile: %I64x\n", IndexEntry->Data.Directory.IndexedFile);
+ DPRINT1("\tLength: %u\n", IndexEntry->Length);
+ DPRINT1("\tKeyLength: %u\n", IndexEntry->KeyLength);
+ DPRINT1("\tFlags: %x\n", IndexEntry->Flags);
+ DPRINT1("\tReserved: %x\n", IndexEntry->Reserved);
+ DPRINT1("\t\tDirectoryFileReferenceNumber: %I64x\n", IndexEntry->FileName.DirectoryFileReferenceNumber);
+ DPRINT1("\t\tCreationTime: %I64u\n", IndexEntry->FileName.CreationTime);
+ DPRINT1("\t\tChangeTime: %I64u\n", IndexEntry->FileName.ChangeTime);
+ DPRINT1("\t\tLastWriteTime: %I64u\n", IndexEntry->FileName.LastWriteTime);
+ DPRINT1("\t\tLastAccessTime: %I64u\n", IndexEntry->FileName.LastAccessTime);
+ DPRINT1("\t\tAllocatedSize: %I64u\n", IndexEntry->FileName.AllocatedSize);
+ DPRINT1("\t\tDataSize: %I64u\n", IndexEntry->FileName.DataSize);
+ DPRINT1("\t\tFileAttributes: %x\n", IndexEntry->FileName.FileAttributes);
+ DPRINT1("\t\tNameLength: %u\n", IndexEntry->FileName.NameLength);
+ DPRINT1("\t\tNameType: %x\n", IndexEntry->FileName.NameType);
+ DPRINT1("\t\tName: %.*S\n", IndexEntry->FileName.NameLength, IndexEntry->FileName.Name);
+}
+#endif
NTSTATUS
-ReadFileRecord(PDEVICE_EXTENSION Vcb,
- ULONG index,
- PFILE_RECORD_HEADER file,
- PFILE_RECORD_HEADER Mft)
+BrowseIndexEntries(PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER MftRecord,
+ PCHAR IndexRecord,
+ ULONG IndexBlockSize,
+ PINDEX_ENTRY_ATTRIBUTE FirstEntry,
+ PINDEX_ENTRY_ATTRIBUTE LastEntry,
+ PUNICODE_STRING FileName,
+ PULONG StartEntry,
+ PULONG CurrentEntry,
+ BOOLEAN DirSearch,
+ ULONGLONG *OutMFTIndex)
{
- PVOID p;
- ULONG BytesPerFileRecord = Vcb->NtfsInfo.BytesPerFileRecord;
- ULONG clusters = max(BytesPerFileRecord / Vcb->NtfsInfo.BytesPerCluster, 1);
- ULONGLONG vcn = index * BytesPerFileRecord / Vcb->NtfsInfo.BytesPerCluster;
- LONG m = (Vcb->NtfsInfo.BytesPerCluster / BytesPerFileRecord) - 1;
- ULONG n = m > 0 ? (index & m) : 0;
+ NTSTATUS Status;
+ ULONG RecordOffset;
+ PINDEX_ENTRY_ATTRIBUTE IndexEntry;
+ PNTFS_ATTR_CONTEXT IndexAllocationCtx;
+ ULONGLONG IndexAllocationSize;
+ PINDEX_BUFFER IndexBuffer;
- p = ExAllocatePoolWithTag(NonPagedPool,
- clusters * Vcb->NtfsInfo.BytesPerCluster,
- TAG_NTFS);
+ DPRINT("BrowseIndexEntries(%p, %p, %p, %u, %p, %p, %wZ, %u, %u, %u, %p)\n", Vcb, MftRecord, IndexRecord, IndexBlockSize, FirstEntry, LastEntry, FileName, *StartEntry, *CurrentEntry, DirSearch, OutMFTIndex);
- ReadVCN (Vcb, Mft, AttributeData, vcn, clusters, p);
+ IndexEntry = FirstEntry;
+ while (IndexEntry < LastEntry &&
+ !(IndexEntry->Flags & NTFS_INDEX_ENTRY_END))
+ {
+ if ((IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK) > 0x10 &&
+ *CurrentEntry >= *StartEntry &&
+ IndexEntry->FileName.NameType != NTFS_FILE_NAME_DOS &&
+ CompareFileName(FileName, IndexEntry, DirSearch))
+ {
+ *StartEntry = *CurrentEntry;
+ *OutMFTIndex = (IndexEntry->Data.Directory.IndexedFile & NTFS_MFT_MASK);
+ return STATUS_SUCCESS;
+ }
- memcpy(file,
- (PVOID)((ULONG_PTR)p + n * BytesPerFileRecord),
- BytesPerFileRecord);
+ (*CurrentEntry) += 1;
+ ASSERT(IndexEntry->Length >= sizeof(INDEX_ENTRY_ATTRIBUTE));
+ IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry + IndexEntry->Length);
+ }
- ExFreePool(p);
+ /* If we're already browsing a subnode */
+ if (IndexRecord == NULL)
+ {
+ return STATUS_OBJECT_PATH_NOT_FOUND;
+ }
- FixupUpdateSequenceArray(file);
+ /* If there's no subnode */
+ if (!(IndexEntry->Flags & NTFS_INDEX_ENTRY_NODE))
+ {
+ return STATUS_OBJECT_PATH_NOT_FOUND;
+ }
- return STATUS_SUCCESS;
-}
+ Status = FindAttribute(Vcb, MftRecord, AttributeIndexAllocation, L"$I30", 4, &IndexAllocationCtx);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT("Corrupted filesystem!\n");
+ return Status;
+ }
+ IndexAllocationSize = AttributeDataLength(&IndexAllocationCtx->Record);
+ Status = STATUS_OBJECT_PATH_NOT_FOUND;
+ for (RecordOffset = 0; RecordOffset < IndexAllocationSize; RecordOffset += IndexBlockSize)
+ {
+ ReadAttribute(Vcb, IndexAllocationCtx, RecordOffset, IndexRecord, IndexBlockSize);
+ Status = FixupUpdateSequenceArray(Vcb, &((PFILE_RECORD_HEADER)IndexRecord)->Ntfs);
+ if (!NT_SUCCESS(Status))
+ {
+ break;
+ }
-VOID
-ReadExternalAttribute(PDEVICE_EXTENSION Vcb,
- PNONRESIDENT_ATTRIBUTE NresAttr,
- ULONGLONG vcn,
- ULONG count,
- PVOID buffer)
+ IndexBuffer = (PINDEX_BUFFER)IndexRecord;
+ ASSERT(IndexBuffer->Ntfs.Type == NRH_INDX_TYPE);
+ ASSERT(IndexBuffer->Header.AllocatedSize + FIELD_OFFSET(INDEX_BUFFER, Header) == IndexBlockSize);
+ FirstEntry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)&IndexBuffer->Header + IndexBuffer->Header.FirstEntryOffset);
+ LastEntry = (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)&IndexBuffer->Header + IndexBuffer->Header.TotalSizeOfEntries);
+ ASSERT(LastEntry <= (PINDEX_ENTRY_ATTRIBUTE)((ULONG_PTR)IndexBuffer + IndexBlockSize));
+
+ Status = BrowseIndexEntries(NULL, NULL, NULL, 0, FirstEntry, LastEntry, FileName, StartEntry, CurrentEntry, DirSearch, OutMFTIndex);
+ if (NT_SUCCESS(Status))
+ {
+ break;
+ }
+ }
+
+ ReleaseAttributeContext(IndexAllocationCtx);
+ return Status;
+}
+
+NTSTATUS
+NtfsFindMftRecord(PDEVICE_EXTENSION Vcb,
+ ULONGLONG MFTIndex,
+ PUNICODE_STRING FileName,
+ PULONG FirstEntry,
+ BOOLEAN DirSearch,
+ ULONGLONG *OutMFTIndex)
{
- ULONGLONG lcn;
- ULONGLONG runcount;
- ULONG readcount;
- ULONG left;
- ULONG n;
+ PFILE_RECORD_HEADER MftRecord;
+ PNTFS_ATTR_CONTEXT IndexRootCtx;
+ PINDEX_ROOT_ATTRIBUTE IndexRoot;
+ PCHAR IndexRecord;
+ PINDEX_ENTRY_ATTRIBUTE IndexEntry, IndexEntryEnd;
+ NTSTATUS Status;
+ ULONG CurrentEntry = 0;
- PUCHAR bytes = (PUCHAR)buffer;
+ DPRINT("NtfsFindMftRecord(%p, %I64d, %wZ, %u, %u, %p)\n", Vcb, MFTIndex, FileName, *FirstEntry, DirSearch, OutMFTIndex);
- for (left = count; left > 0; left -= readcount)
+ MftRecord = ExAllocatePoolWithTag(NonPagedPool,
+ Vcb->NtfsInfo.BytesPerFileRecord,
+ TAG_NTFS);
+ if (MftRecord == NULL)
{
- FindRun(NresAttr, vcn, &lcn, &runcount);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
-// readcount = (ULONG)(__min(runcount, left));
- readcount = (ULONG)min(runcount, left);
+ Status = ReadFileRecord(Vcb, MFTIndex, MftRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+ return Status;
+ }
+ ASSERT(MftRecord->Ntfs.Type == NRH_FILE_TYPE);
+ Status = FindAttribute(Vcb, MftRecord, AttributeIndexRoot, L"$I30", 4, &IndexRootCtx);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+ return Status;
+ }
- n = readcount * Vcb->NtfsInfo.BytesPerCluster;
+ IndexRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerIndexRecord, TAG_NTFS);
+ if (IndexRecord == NULL)
+ {
+ ReleaseAttributeContext(IndexRootCtx);
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
- if (lcn == 0)
- memset(bytes, 0, n);
- else
- ReadLCN(Vcb, lcn, readcount, bytes);
+ ReadAttribute(Vcb, IndexRootCtx, 0, IndexRecord, Vcb->NtfsInfo.BytesPerIndexRecord);
+ IndexRoot = (PINDEX_ROOT_ATTRIBUTE)IndexRecord;
+ IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)&IndexRoot->Header + IndexRoot->Header.FirstEntryOffset);
+ /* Index root is always resident. */
+ IndexEntryEnd = (PINDEX_ENTRY_ATTRIBUTE)(IndexRecord + IndexRoot->Header.TotalSizeOfEntries);
+ ReleaseAttributeContext(IndexRootCtx);
- vcn += readcount;
- bytes += n;
- }
-}
+ DPRINT("IndexRecordSize: %x IndexBlockSize: %x\n", Vcb->NtfsInfo.BytesPerIndexRecord, IndexRoot->SizeOfEntry);
+ Status = BrowseIndexEntries(Vcb, MftRecord, IndexRecord, IndexRoot->SizeOfEntry, IndexEntry, IndexEntryEnd, FileName, FirstEntry, &CurrentEntry, DirSearch, OutMFTIndex);
-VOID
-ReadVCN(PDEVICE_EXTENSION Vcb,
- PFILE_RECORD_HEADER file,
- ATTRIBUTE_TYPE type,
- ULONGLONG vcn,
- ULONG count,
- PVOID buffer)
+ ExFreePoolWithTag(IndexRecord, TAG_NTFS);
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+
+ return Status;
+}
+
+NTSTATUS
+NtfsLookupFileAt(PDEVICE_EXTENSION Vcb,
+ PUNICODE_STRING PathName,
+ PFILE_RECORD_HEADER *FileRecord,
+ PULONGLONG MFTIndex,
+ ULONGLONG CurrentMFTIndex)
{
- PNONRESIDENT_ATTRIBUTE NresAttr;
- PATTRIBUTE attr;
+ UNICODE_STRING Current, Remaining;
+ NTSTATUS Status;
+ ULONG FirstEntry = 0;
- attr = FindAttribute(file, type, 0);
+ DPRINT("NtfsLookupFileAt(%p, %wZ, %p, %I64x)\n", Vcb, PathName, FileRecord, CurrentMFTIndex);
- NresAttr = (PNONRESIDENT_ATTRIBUTE) attr;
+ FsRtlDissectName(*PathName, &Current, &Remaining);
- if (NresAttr == 0 || (vcn < NresAttr->StartVcn ||vcn > NresAttr->LastVcn))
+ while (Current.Length != 0)
{
-// PATTRIBUTE attrList = FindAttribute(file,AttributeAttributeList,0);
- DbgPrint("Exeption \n");
-// KeDebugCheck(0);
+ DPRINT("Current: %wZ\n", &Current);
+
+ Status = NtfsFindMftRecord(Vcb, CurrentMFTIndex, &Current, &FirstEntry, FALSE, &CurrentMFTIndex);
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+
+ if (Remaining.Length == 0)
+ break;
+
+ FsRtlDissectName(Current, &Current, &Remaining);
}
- ReadExternalAttribute(Vcb, NresAttr, vcn, count, buffer);
-}
+ *FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
+ if (*FileRecord == NULL)
+ {
+ DPRINT("NtfsLookupFileAt: Can't allocate MFT record\n");
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+ Status = ReadFileRecord(Vcb, CurrentMFTIndex, *FileRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT("NtfsLookupFileAt: Can't read MFT record\n");
+ ExFreePoolWithTag(*FileRecord, TAG_NTFS);
+ return Status;
+ }
-#if 0
-BOOL bitset(PUCHAR bitmap, ULONG i)
-{
- return (bitmap[i>>3] & (1 << (i & 7))) !=0;
+ *MFTIndex = CurrentMFTIndex;
+
+ return STATUS_SUCCESS;
}
-#endif
+NTSTATUS
+NtfsLookupFile(PDEVICE_EXTENSION Vcb,
+ PUNICODE_STRING PathName,
+ PFILE_RECORD_HEADER *FileRecord,
+ PULONGLONG MFTIndex)
+{
+ return NtfsLookupFileAt(Vcb, PathName, FileRecord, MFTIndex, NTFS_FILE_ROOT);
+}
-VOID
-FixupUpdateSequenceArray(PFILE_RECORD_HEADER file)
+NTSTATUS
+NtfsFindFileAt(PDEVICE_EXTENSION Vcb,
+ PUNICODE_STRING SearchPattern,
+ PULONG FirstEntry,
+ PFILE_RECORD_HEADER *FileRecord,
+ PULONGLONG MFTIndex,
+ ULONGLONG CurrentMFTIndex)
{
- PUSHORT usa = (PUSHORT)((ULONG_PTR)file + file->Ntfs.UsaOffset);
- PUSHORT sector = (PUSHORT)file;
- ULONG i;
+ NTSTATUS Status;
- for (i = 1; i < file->Ntfs.UsaCount; i++)
+ DPRINT("NtfsFindFileAt(%p, %wZ, %u, %p, %p, %I64x)\n", Vcb, SearchPattern, *FirstEntry, FileRecord, MFTIndex, CurrentMFTIndex);
+
+ Status = NtfsFindMftRecord(Vcb, CurrentMFTIndex, SearchPattern, FirstEntry, TRUE, &CurrentMFTIndex);
+ if (!NT_SUCCESS(Status))
{
- sector[255] = usa[i];
- sector += 256;
+ DPRINT("NtfsFindFileAt: NtfsFindMftRecord() failed with status 0x%08lx\n", Status);
+ return Status;
}
-}
+ *FileRecord = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
+ if (*FileRecord == NULL)
+ {
+ DPRINT("NtfsFindFileAt: Can't allocate MFT record\n");
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
-NTSTATUS
-ReadLCN(PDEVICE_EXTENSION Vcb,
- ULONGLONG lcn,
- ULONG count,
- PVOID buffer)
-{
- LARGE_INTEGER DiskSector;
+ Status = ReadFileRecord(Vcb, CurrentMFTIndex, *FileRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT("NtfsFindFileAt: Can't read MFT record\n");
+ ExFreePoolWithTag(*FileRecord, TAG_NTFS);
+ return Status;
+ }
- DiskSector.QuadPart = lcn;
+ *MFTIndex = CurrentMFTIndex;
- return NtfsReadSectors(Vcb->StorageDevice,
- DiskSector.u.LowPart * Vcb->NtfsInfo.SectorsPerCluster,
- count * Vcb->NtfsInfo.SectorsPerCluster,
- Vcb->NtfsInfo.BytesPerSector,
- buffer,
- FALSE);
+ return STATUS_SUCCESS;
}
/* EOF */
projects / reactos.git / blobdiff