[tthompson] 71664: [NTFS] Update a file's size in the relevant $FILE_NAME attribute of the index entry in the parent directory. +UpdateFileNameRecord() - Searches a parent directory for the proper ...
23 Jun
2016
23 Jun
'16
6:02 p.m.
Author: tthompson
Date: Thu Jun 23 18:02:03 2016
New Revision: 71664
URL: http://svn.reactos.org/svn/reactos?rev=71664&view=rev
Log:
[NTFS]
Update a file's size in the relevant $FILE_NAME attribute of the index entry in the
parent directory.
+UpdateFileNameRecord() - Searches a parent directory for the proper index entry, then
updates the file sizes in that entry.
+UpdateIndexEntryFileNameSize() - Recursively searches directory index and applies the
size update.
Modified:
branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c
branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h
branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/rw.c
Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c [iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/mft.c [iso-8859-1] Thu Jun 23
18:02:03 2016
@@ -685,6 +685,212 @@
return FixupUpdateSequenceArray(Vcb, &file->Ntfs);
}
+
+/**
+* Searches a file's parent directory (given the parent's index in the mft)
+* for the given file. Upon finding an index entry for that file, updates
+* Data Size and Allocated Size values in the $FILE_NAME attribute of that entry.
+*
+* (Most of this code was copied from NtfsFindMftRecord)
+*/
+NTSTATUS
+UpdateFileNameRecord(PDEVICE_EXTENSION Vcb,
+ ULONGLONG ParentMFTIndex,
+ PUNICODE_STRING FileName,
+ BOOLEAN DirSearch,
+ ULONGLONG NewDataSize,
+ ULONGLONG NewAllocationSize)
+{
+ PFILE_RECORD_HEADER MftRecord;
+ PNTFS_ATTR_CONTEXT IndexRootCtx;
+ PINDEX_ROOT_ATTRIBUTE IndexRoot;
+ PCHAR IndexRecord;
+ PINDEX_ENTRY_ATTRIBUTE IndexEntry, IndexEntryEnd;
+ NTSTATUS Status;
+ ULONG CurrentEntry = 0;
+
+ DPRINT("UpdateFileNameRecord(%p, %I64d, %wZ, %u, %I64u, %I64u)\n", Vcb,
ParentMFTIndex, FileName, DirSearch, NewDataSize, NewAllocationSize);
+
+ MftRecord = ExAllocatePoolWithTag(NonPagedPool,
+ Vcb->NtfsInfo.BytesPerFileRecord,
+ TAG_NTFS);
+ if (MftRecord == NULL)
+ {
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ Status = ReadFileRecord(Vcb, ParentMFTIndex, MftRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+ return Status;
+ }
+
+ ASSERT(MftRecord->Ntfs.Type == NRH_FILE_TYPE);
+ Status = FindAttribute(Vcb, MftRecord, AttributeIndexRoot, L"$I30", 4,
&IndexRootCtx, NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+ return Status;
+ }
+
+ IndexRecord = ExAllocatePoolWithTag(NonPagedPool,
Vcb->NtfsInfo.BytesPerIndexRecord, TAG_NTFS);
+ if (IndexRecord == NULL)
+ {
+ ReleaseAttributeContext(IndexRootCtx);
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ 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);
+
+ DPRINT("IndexRecordSize: %x IndexBlockSize: %x\n",
Vcb->NtfsInfo.BytesPerIndexRecord, IndexRoot->SizeOfEntry);
+
+ Status = UpdateIndexEntryFileNameSize(Vcb,
+ MftRecord,
+ IndexRecord,
+ IndexRoot->SizeOfEntry,
+ IndexEntry,
+ IndexEntryEnd,
+ FileName,
+ &CurrentEntry,
+ &CurrentEntry,
+ DirSearch,
+ NewDataSize,
+ NewAllocationSize);
+
+ ReleaseAttributeContext(IndexRootCtx);
+ ExFreePoolWithTag(IndexRecord, TAG_NTFS);
+ ExFreePoolWithTag(MftRecord, TAG_NTFS);
+
+ return Status;
+}
+
+/**
+* Recursively searches directory index and applies the size update to the $FILE_NAME
attribute of the
+* proper index entry.
+* (Heavily based on BrowseIndexEntries)
+*/
+NTSTATUS
+UpdateIndexEntryFileNameSize(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 NewDataSize,
+ ULONGLONG NewAllocatedSize)
+{
+ NTSTATUS Status;
+ ULONG RecordOffset;
+ PINDEX_ENTRY_ATTRIBUTE IndexEntry;
+ PNTFS_ATTR_CONTEXT IndexAllocationCtx;
+ ULONGLONG IndexAllocationSize;
+ PINDEX_BUFFER IndexBuffer;
+
+ DPRINT("UpdateIndexEntrySize(%p, %p, %p, %u, %p, %p, %wZ, %u, %u, %u, %I64u,
%I64u)\n", Vcb, MftRecord, IndexRecord, IndexBlockSize, FirstEntry, LastEntry,
FileName, *StartEntry, *CurrentEntry, DirSearch, NewDataSize, NewAllocatedSize);
+
+ // find the index entry responsible for the file we're trying to update
+ 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;
+ IndexEntry->FileName.DataSize = NewDataSize;
+ IndexEntry->FileName.AllocatedSize = NewAllocatedSize;
+ // indicate that the caller will still need to write the structure to the
disk
+ return STATUS_PENDING;
+ }
+
+ (*CurrentEntry) += 1;
+ ASSERT(IndexEntry->Length >= sizeof(INDEX_ENTRY_ATTRIBUTE));
+ IndexEntry = (PINDEX_ENTRY_ATTRIBUTE)((PCHAR)IndexEntry +
IndexEntry->Length);
+ }
+
+ /* If we're already browsing a subnode */
+ if (IndexRecord == NULL)
+ {
+ return STATUS_OBJECT_PATH_NOT_FOUND;
+ }
+
+ /* If there's no subnode */
+ if (!(IndexEntry->Flags & NTFS_INDEX_ENTRY_NODE))
+ {
+ return STATUS_OBJECT_PATH_NOT_FOUND;
+ }
+
+ Status = FindAttribute(Vcb, MftRecord, AttributeIndexAllocation, L"$I30",
4, &IndexAllocationCtx, NULL);
+ 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;
+ }
+
+ 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 = UpdateIndexEntryFileNameSize(NULL, NULL, NULL, 0, FirstEntry, LastEntry,
FileName, StartEntry, CurrentEntry, DirSearch, NewDataSize, NewAllocatedSize);
+ if (Status == STATUS_PENDING)
+ {
+ // write the index record back to disk
+ ULONG Written;
+
+ // first we need to update the fixup values for the index block
+ Status = AddFixupArray(Vcb,
&((PFILE_RECORD_HEADER)IndexRecord)->Ntfs);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Error: Failed to update fixup sequence array!\n");
+ break;
+ }
+
+ Status = WriteAttribute(Vcb, IndexAllocationCtx, RecordOffset, (const
PUCHAR)IndexRecord, IndexBlockSize, &Written);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("ERROR Performing write!\n");
+ break;
+ }
+
+ Status = STATUS_SUCCESS;
+ break;
+ }
+ if (NT_SUCCESS(Status))
+ {
+ break;
+ }
+ }
+
+ ReleaseAttributeContext(IndexAllocationCtx);
+ return Status;
+}
+
/**
* UpdateFileRecord
* @implemented
Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h [iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/ntfs.h [iso-8859-1] Thu Jun 23
18:02:03 2016
@@ -778,10 +778,37 @@
ULONG
AttributeAllocatedLength(PNTFS_ATTR_RECORD AttrRecord);
+BOOLEAN
+CompareFileName(PUNICODE_STRING FileName,
+ PINDEX_ENTRY_ATTRIBUTE IndexEntry,
+ BOOLEAN DirSearch);
+
NTSTATUS
ReadFileRecord(PDEVICE_EXTENSION Vcb,
ULONGLONG index,
PFILE_RECORD_HEADER file);
+
+NTSTATUS
+UpdateIndexEntryFileNameSize(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 NewDataSize,
+ ULONGLONG NewAllocatedSize);
+
+NTSTATUS
+UpdateFileNameRecord(PDEVICE_EXTENSION Vcb,
+ ULONGLONG ParentMFTIndex,
+ PUNICODE_STRING FileName,
+ BOOLEAN DirSearch,
+ ULONGLONG NewDataSize,
+ ULONGLONG NewAllocationSize);
NTSTATUS
UpdateFileRecord(PDEVICE_EXTENSION Vcb,
Modified: branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/rw.c
URL:
http://svn.reactos.org/svn/reactos/branches/GSoC_2016/NTFS/drivers/filesyst…
==============================================================================
--- branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/rw.c [iso-8859-1] (original)
+++ branches/GSoC_2016/NTFS/drivers/filesystems/ntfs/rw.c [iso-8859-1] Thu Jun 23 18:02:03
2016
@@ -410,6 +410,9 @@
{
LARGE_INTEGER DataSize;
ULONGLONG AllocationSize;
+ PFILENAME_ATTRIBUTE fileNameAttribute;
+ ULONGLONG ParentMFTId;
+ UNICODE_STRING filename;
DataSize.QuadPart = WriteOffset + Length;
@@ -427,7 +430,19 @@
}
// now we need to update this file's size in every directory index entry
that references it
- // (saved for a later commit)
+ // TODO: put this code in its own function and adapt it to work with every
filename / hardlink
+ // stored in the file record.
+ fileNameAttribute = GetBestFileNameFromRecord(Fcb->Vcb, FileRecord);
+ ASSERT(fileNameAttribute);
+
+ ParentMFTId = fileNameAttribute->DirectoryFileReferenceNumber &
NTFS_MFT_MASK;
+
+ filename.Buffer = fileNameAttribute->Name;
+ filename.Length = fileNameAttribute->NameLength * sizeof(WCHAR);
+ filename.MaximumLength = filename.Length;
+
+ Status = UpdateFileNameRecord(Fcb->Vcb, ParentMFTId, &filename, FALSE,
DataSize.QuadPart, AllocationSize);
+
}
else
{
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