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[NTFS] - Add some improvements to B-Tree support. Add preliminary support for trees of arbitrary depth. Add support for creating files in directories which have an index allocation, provided there aren't too many files and the node doesn't need to be split.

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-CreateBTreeFromIndex() - Fix memory allocation; allocate sizeof(B_TREE_KEY) bytes for the key, not the size of the pointer. Add support for child nodes. Update parameter list.
-CreateIndexRootFromBTree() - Update Header->Flags if any of index root's keys have sub-nodes.
+CreateIndexBufferFromBTreeNode() - Converts a B-Tree node to an index buffer to be written to the index allocation.
+UpdateIndexAllocation() - Updates all of the stale nodes in an index allocation based on a PB_TREE.
+UpdateIndexNode() - Writes a B-Tree node into the index allocation.
+CreateBTreeKeyFromFilename() - Creates a PB_TREE_KEY based on a FILENAME_ATTRIBUTE.
-DestroyBTreeKey() - Destroy a child node, if present.
-DumpBTreeKey() - Dump a child node, if present.
-DumpBTreeNode() - Include Node->KeyCount in output.
-NtfsAddFilenameToDirectory() - Call UpdateIndexAllocation() prior to CreateIndexRootFromBTree().
-Update B_TREE_FILENAME_NODE with members to keep track of its existence on disk.

svn path=/branches/GSoC_2016/NTFS/; revision=75428
This commit is contained in:
Trevor Thompson 2017-07-27 19:52:33 +00:00 • committed by Thomas Faber
parent b1eab36f6b
commit 92d1f92a61
3 changed files with 570 additions and 60 deletions
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20
drivers/filesystems/ntfs/mft.c
View file

@ -1969,7 +1969,11 @@ NtfsAddFilenameToDirectory(PDEVICE_EXTENSION DeviceExt,
}
// Convert the index to a B*Tree
Status = CreateBTreeFromIndex(IndexRootContext, I30IndexRoot, &NewTree);
Status = CreateBTreeFromIndex(DeviceExt,
ParentFileRecord,
IndexRootContext,
I30IndexRoot,
&NewTree);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to create B-Tree from Index!\n");
@ -1995,7 +1999,19 @@ NtfsAddFilenameToDirectory(PDEVICE_EXTENSION DeviceExt,
DumpBTree(NewTree);
// Convert B*Tree back to Index Root
// Convert B*Tree back to Index
Status = UpdateIndexAllocation(DeviceExt, NewTree, I30IndexRoot->SizeOfEntry, ParentFileRecord);
if (!NT_SUCCESS(Status))
{
DPRINT1("ERROR: Failed to update index allocation from B-Tree!\n");
DestroyBTree(NewTree);
ReleaseAttributeContext(IndexRootContext);
ExFreePoolWithTag(I30IndexRoot, TAG_NTFS);
ExFreePoolWithTag(ParentFileRecord, TAG_NTFS);
return Status;
}
// Create the Index Root from the B*Tree
Status = CreateIndexRootFromBTree(DeviceExt, NewTree, MaxIndexSize, &NewIndexRoot, &BtreeIndexLength);
if (!NT_SUCCESS(Status))
{