567 lines
22 KiB
C
567 lines
22 KiB
C
/*++
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Copyright (c) 1999 Microsoft Corporation
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Module Name:
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hivedata.h
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Abstract:
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This module contains data structures used by the direct memory loaded hive manager.
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Author:
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Dragos C. Sambotin (dragoss) 13-Jan-99
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*/
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#ifndef __HIVE_DATA__
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#define __HIVE_DATA__
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// ===== Arbitrary Limits Imposed For Sanity =====
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#define HSANE_CELL_MAX (1024*1024) // 1 megabyte max size for a single cell
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// ===== Tuning =====
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#define HBIN_THRESHOLD (HBLOCK_SIZE-512) // If less than threshold bytes would be left in bin, add another page
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#define HLOG_GROW HBLOCK_SIZE // Minimum size to grow log by. Can set this up if we think it thrashes.
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#define HCELL_BIG_ROUND (HBLOCK_SIZE*3) //
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// If someone tries to
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// allocate a very large
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// cell, round it up to
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// HBLOCK_SIZE. This is
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// the rather arbitrary
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// define for "very large"
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// Never shrink the log files smaller than this, this prevents people
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// from sucking up all the disk space and then being unable to do
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// critical registry operations (like logging on to delete some files)
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#define HLOG_MINSIZE(Hive) ((Hive)->Cluster * HSECTOR_SIZE * 2)
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// ===== Basic Structures and Definitions =====
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// These are same whether on disk or in memory.
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// NOTE: Volatile == storage goes away at reboot
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// Stable == Persistent == Not Volatile
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typedef enum {
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Stable = 0,
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Volatile = 1
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} HSTORAGE_TYPE;
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#define HTYPE_COUNT 2
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// --- HCELL_INDEX ---
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// Handle to a cell -> effectively the "virtual" address of the cell,
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// HvMapCell converts this to a "real" address, that is, a memory
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// address. Mapping scheme is very much like that standard two level
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// page table. No mappings stored in file, they are built up when
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// the file is read in. (The INDEX in HCELL_INDEX is historical)
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// Bit 31 30-21 20-12 11-0
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// +----------------------------+
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// | T | Table | Block | Offset |
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// +----------------------------+
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// T = Type(1)= 0 for stable ("normal") storage
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// 1 for volatile storage
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// Table(10) = Index into directory of mapping tables, selects a table.
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// Each mapping table is an array of HMAP_ENTRY structures.
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// Block(9) = Index into Table, selects an HMAP_ENTRY. HMAP_ENTRY
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// contains address of area in memory that this HCELL_INDEX
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// maps to. (Base of memory copy of Block)
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// Offset(12) = Offset within page, of the Cell header for the cell
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// of interest.
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typedef ULONG HCELL_INDEX;
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typedef HCELL_INDEX *PHCELL_INDEX;
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#define HCELL_NIL ((HCELL_INDEX)(-1))
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#define HCELL_TYPE_MASK 0x80000000
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#define HCELL_TYPE_SHIFT 31
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#define HCELL_TABLE_MASK 0x7fe00000
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#define HCELL_TABLE_SHIFT 21
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#define HCELL_BLOCK_MASK 0x001ff000
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#define HCELL_BLOCK_SHIFT 12
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#define HCELL_OFFSET_MASK 0x00000fff
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#define HBLOCK_SIZE 0x1000 // LOGICAL block size
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// This is the size of one of the registry's logical/virtual
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// pages. It has no particular relationship to page size of the machine.
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#define HSECTOR_SIZE 0x200 // LOGICAL sector size
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#define HSECTOR_COUNT 8 // LOGICAL sectors / LOGICAL Block
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#define HTABLE_SLOTS 512 // 9 bits of address
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#define HDIRECTORY_SLOTS 1024 // 10 bits of address
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#define HvGetCellType(Cell) ((ULONG)((Cell & HCELL_TYPE_MASK) >> HCELL_TYPE_SHIFT))
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// --- HCELL --- an object within the hive (A bin is filled with HCELLs)
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// Any given item of user data must fit within a single HCELL.
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// HCELLs cannot span Bins.
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#define HCELL_PAD(Hive) ((Hive->Version>=2) ? 8 : 16)
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// All cells must be at least this large,
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// All allocations on this boundary
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#define HCELL_ALLOCATE_FILL 0xb2 // bz -> buzz buzz (yeah, it's a stretch)
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// must fill all newly allocated
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// cells for security reasons
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#define HCELL_FREE_FILL 0xfc // fc = HvFreeCell...
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// Currently we support two cell formats, one with a Last backpointer (old version), and one without (new version)
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// All cells in a hive must be of the same type. Version 1 hives use the old version, Version 2 or greater use the new version.
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#define USE_OLD_CELL(Hive) (Hive->Version==1)
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typedef struct _HCELL {
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LONG Size;
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union {
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struct {
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ULONG Last;
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union {
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ULONG UserData;
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HCELL_INDEX Next; // offset of next element in freelist (not a FLink)
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} u;
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} OldCell;
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struct {
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union {
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ULONG UserData;
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HCELL_INDEX Next; // offset of next element in freelist (not a FLink)
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} u;
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} NewCell;
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} u;
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} HCELL, *PHCELL;
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// --- HBIN --- is a contiguous set of HBLOCKs, filled with HCELLs.
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#define HBIN_SIGNATURE 0x6e696268 // "hbin"
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#define HBIN_NIL (-1)
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#pragma pack(4)
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typedef struct _HBIN {
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ULONG Signature;
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ULONG FileOffset; // Own file offset (used in checking)
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ULONG Size; // Size of bin in bytes, all inclusive
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ULONG Reserved1[2]; // Old FreeSpace and FreeList (from 1.0)
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LARGE_INTEGER TimeStamp; // Old Link (from 1.0). Usually trash, but
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// first bin has valid value used for .log
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// correspondence testing, only meaningful
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// on disk.
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ULONG MemAlloc; // if non 0, this is first bin of allocation
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// and this is it's size. else, middle
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// bin of an allocation. MEMORY ONLY,
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// field on disk has no meaning.
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// Cell data goes here
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} HBIN, *PHBIN;
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#pragma pack()
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// ===== On Disk Structures =====
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// NOTE: Hive storage is always allocated in units of 4K. This size
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// must be used on all systems, regardless of page size, since
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// the file format needs to be transportable amoung systems.
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// NOTE: The integrity code depends on certain blocks (e.g., the
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// BASE block) being at least as large as the size of a physical
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// sector. (Otherwise data that should be left alone will
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// be written because the FS has to block/deblock.) This means
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// that the current code will not work with sectors > 4K.
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// NOTE: A hive on disk always contains at least two blocks of storage.
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// 1 block for the base block, and 1 for the minimum 1 bin.
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// NOTE: Only modified parts of the hive get written to disk.
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// This is not just for efficiency, but also to avoid risk
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// of destruction of unlogged data. Dirty bits keep track
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// of what has been modified, they reside in a simple
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// bit map attached to the hive. One bit for each logical
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// sector of 512 bytes.
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// If the physical sector size of the machine is less than 512,
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// no matter, we'll always write in clumps of 512. If the
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// physical sector size is greater than 512, we'll always clump
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// data together so that we log and write data
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// in chunks of that size. Physical sector sizes > 4K will
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// not work correctly (logging will not work right, so system
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// crashes may lose data that would not otherwise be lost.)
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// An on disk image of a hive looks like this:
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// +---------------------------------------+
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// | HBASE_BLOCK | 1 Hive Block == 4K
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// | |
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// +---------------------------------------+ <- HBLOCK_SIZE boundary
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// | Bin - 1 to N 4K blocks |
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// | Each contains a signature, size, and |
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// | a boundary tag heap internal to |
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// | itself. Once allocated lives forever |
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// | and always at same file offset. |
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// +---------------------------------------+ <- HBLOCK_SIZE boundary
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// | Bin ... |
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// +---------------------------------------+ <- HBLOCK_SIZE boundary
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// ...
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// +---------------------------------------+ <- HBLOCK_SIZE boundary
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// | Last allocated Bin, new bins are put |
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// | immediately after this one. |
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// +---------------------------------------+ <- HBLOCK_SIZE boundary
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// Hive files must allocate on HBLOCK_SIZE boundaries because they might be written on many different systems, and must therefore be set up for the largest cluster size we will support.
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// The log file format is:
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// +-------------------------------+
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// | HBASE_BLOCK copy |
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// +-------------------------------+ <- cluster (usually 512) bound
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// | DirtyVector |
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// | (length computed from length |
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// | in the base block |
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// | (with "DIRT" on front as a |
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// | signature) |
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// +-------------------------------+ <- cluster (usually 512) bound
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// | Dirty Data |
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// +-------------------------------+ <- cluster (usually 512) bound
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// | Dirty Data |
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// +-------------------------------+ <- cluster (usually 512) bound
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// | ... |
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// +-------------------------------+
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// Recovery consists of reading the file in, computing which clusters of data are present from the dirtyvector, and where they belong in
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// the hive address space. Position in file is by sequential count.
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// Logs can allocate on cluster boundaries (physical sector size of host machine) because they will never be written on any machine other
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// than the one that created them.
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// For log to be valid:
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// Signature, format, major.minor must match expected values.
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// Sequence1 and Sequence2 must match.
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// CheckSum must be correct.
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// Signture on DirtyVector must be correct
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// For log to be applicable:
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// Sequence in log must match sequence in hive.
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// TimeStamp in log must match TimeStamp in hive.
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// Hive must be in mid-update state, or have bogus header.
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// --- HBASE_BLOCK --- on disk description of the hive
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// NOTE: HBASE_BLOCK must be >= the size of physical sector,
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// or integrity assumptions will be violated, and crash
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// recovery may not work.
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#define HBASE_BLOCK_SIGNATURE 0x66676572 // "regf"
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#define HSYS_MAJOR 1 // Must match to read at all
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#define HSYS_MINOR 3 // Must be <= to write, always
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// set up to writer's version.
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#define HBASE_FORMAT_MEMORY 1 // Direct memory load case
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#define HBASE_NAME_ALLOC 64 // 32 unicode chars
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#pragma pack(4)
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typedef struct _HBASE_BLOCK {
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ULONG Signature;
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ULONG Sequence1;
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ULONG Sequence2;
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LARGE_INTEGER TimeStamp;
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ULONG Major;
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ULONG Minor;
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ULONG Type; // HFILE_TYPE_[PRIMARY|LOG]
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ULONG Format;
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HCELL_INDEX RootCell;
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ULONG Length; // Includes all but header
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ULONG Cluster; // for logs only
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UCHAR FileName[HBASE_NAME_ALLOC]; // filename tail
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ULONG Reserved1[99];
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ULONG CheckSum;
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ULONG Reserved2[128*7];
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} HBASE_BLOCK, *PHBASE_BLOCK;
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#pragma pack()
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#define HLOG_HEADER_SIZE (FIELD_OFFSET(HBASE_BLOCK, Reserved2))
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#define HLOG_DV_SIGNATURE 0x54524944 // "DIRT"
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// ===== In Memory Structures =====
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// In memory image of a Hive looks just like the on-disk image, EXCEPT that the HBIN structures can be spread throughout memory rather than packed together.
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// To find an HCELL in memory, a mechanism that takes an HCELL_INDEX and
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// derives a memory address from it is used. That mechanism is very
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// similar to a two level hardware paging table.
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// A bit map is used to remember which parts of the hive are dirty.
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// An HBLOCK can be in three different states
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// 1. Present in memory. BlockAddress and BinAddress are valid pointers.
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// This is the normal state of an HBLOCK.
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// 2. Discardable. The HBIN containing this HBLOCK is completely free, but
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// the bin is dirty and needs to be written to the hive file before it
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// can be free. This is the state we will be in if somebody frees a
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// cell, causing the entire HBIN to become free. HvpEnlistFreeCell will
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// transition all the HBLOCKs in the free HBIN to this state, but will
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// not free their memory. After the dirty HBLOCKs are flushed to the
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// file, the memory will be freed.
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// Note that if we need to allocate more storage from an HBIN in this
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// state, HvAllocateCell will simply change its state back to State 1
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// and it will be usable.
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// An HBLOCK in this state has a valid BlockAddress and BinAddress, but
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// the HMAP_DISCARDABLE bit will be set.
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// 3. Discarded. The HBIN containing this HBLOCK is completely free, and
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// is not dirty (i.e. it is marked as free in the hive file as well).
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// There is no memory allocated to contain this HBIN. After HvSyncHive
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// writes out an HBIN that is in State 2, it frees its pool and the
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// HBIN moves into this state.
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// In order to use this HBIN, memory must be allocated to back it, and
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// the HBIN and initial HCELL must be recreated. (we could re-read it
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// from the hive file, but there's not much point in that since we know
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// that it is entirely free, so we might as well just recreate it and
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// save the disk i/o)
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// An HBLOCK in this state has a NULL BlockAddress in the map.
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// The BinAddress will contain the next HCELL in the free list, so
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// we can reconstruct this when we need it.
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// The HMAP_NEWALLOC bit will be set for the first HBLOCK in the HBIN.
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// --- HMAP_ENTRY --- Holds memory location of HCELL
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#define HMAP_FLAGS (3)
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#define HMAP_BASE (~3)
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#define HMAP_NEWALLOC 1
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#define HMAP_DISCARDABLE 2
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typedef struct _HMAP_ENTRY {
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ULONG_PTR BlockAddress; // Low 2 bits always 0. High bits
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// are memory address of HBLOCK that
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// HCELL starts in, add Offset to this.
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// (An HCELL can span several HBLOCKs)
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ULONG_PTR BinAddress; // Low bit set TRUE to mark beginning
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// of a new allocation.
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// High bits are memory address of
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// first HBLOCK in same bin.
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// (A given HCELL is always contained
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// in a single bin.)
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} HMAP_ENTRY, *PHMAP_ENTRY;
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// --- HMAP_TABLE --- Array of MAP_ENTRYs that point to memory HBLOCKs
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// Each HBLOCK worth of space in the Hive image has an entry in an HMAP_TABLE.
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typedef struct _HMAP_TABLE {
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HMAP_ENTRY Table[ HTABLE_SLOTS ];
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} HMAP_TABLE, *PHMAP_TABLE;
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// --- HMAP_DIRECTORY --- Array of pointers to HMAP_TABLEs
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typedef struct _HMAP_DIRECTORY {
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PHMAP_TABLE Directory[ HDIRECTORY_SLOTS ];
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} HMAP_DIRECTORY, *PHMAP_DIRECTORY;
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// ===== Hive Routines typedefs =====
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struct _HHIVE; // forward
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typedef
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PVOID
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(*PALLOCATE_ROUTINE) (
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ULONG Length, // Size of new block wanted
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BOOLEAN UseForIo // TRUE if yes, FALSE if no
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);
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typedef
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VOID
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(*PFREE_ROUTINE) (
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PVOID MemoryBlock,
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ULONG GlobalQuotaSize
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);
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typedef
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BOOLEAN
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(*PFILE_SET_SIZE_ROUTINE) (
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struct _HHIVE *Hive,
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ULONG FileType,
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ULONG FileSize
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);
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typedef struct {
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ULONG FileOffset;
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PVOID DataBuffer;
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ULONG DataLength;
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} CMP_OFFSET_ARRAY, * PCMP_OFFSET_ARRAY;
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typedef
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BOOLEAN
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(*PFILE_WRITE_ROUTINE) (
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struct _HHIVE *Hive,
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ULONG FileType,
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PCMP_OFFSET_ARRAY offsetArray,
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ULONG offsetArrayCount,
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PULONG FileOffset
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);
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typedef
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BOOLEAN
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(*PFILE_READ_ROUTINE) (
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struct _HHIVE *Hive,
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ULONG FileType,
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PULONG FileOffset,
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PVOID DataBuffer,
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ULONG DataLength
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);
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typedef
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BOOLEAN
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(*PFILE_FLUSH_ROUTINE) (
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struct _HHIVE *Hive,
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ULONG FileType
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);
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typedef
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struct _CELL_DATA *
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(*PGET_CELL_ROUTINE)(
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struct _HHIVE *Hive,
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HCELL_INDEX Cell
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);
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// --- HHIVE --- In memory descriptor for a hive.
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// HHIVE contains pointers to service procedures, and pointers to map structure.
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// NOTE: Optimization - If the size of a hive is less than what can be mapped with a single HMAP_TABLE (HTABLE_SLOTS * HBLOCK_SIZE,
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// or 2 megabytes) there is no real HMAP_DIRECTORY. Instead,
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// a single DWORD in the HHIVE acts as the 0th entry of the directory.
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// NOTE: Free Storage Management - When a hive is loaded, we build up a display (vector) of lists of free cells. The first part
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// of this vector contains lists that only hold one size cell.
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// The size of cell on the list is HCELL_PAD * (ListIndex+1)
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// There are 15 of these lists, so all free cells between 8 and 120 bytes are on these lists.
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// The second part of this vector contains lists that hold more than one size cell. Each size bucket is twice the previous
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// size. There are 8 of these lists, so all free cells between 136 and 32768 bytes are on these lists.
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// The last list in this vector contains all cells too large to fit in any previous list.
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// Example: All free cells of size 1 HCELL_PAD (8 bytes)
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// are on the list at offset 0 in FreeDisplay.
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// All free cells of size 15 HCELL_PAD (120 bytes)
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// are on the list at offset 0xe.
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// All free cells of size 16-31 HCELL_PAD (128-248 bytes)
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// are on the list at offset 0xf
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// All free cells of size 32-63 HCELL_PAD (256-506 bytes)
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// are on the list at offset 0x10.
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// All free cells of size 2048 HCELL_PAD (16384 bytes)
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// OR greater, are on the list at offset 0x17.
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// FreeSummary is a bit vector, with a bit set to true for each
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// entry in FreeDisplay that is not empty.
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#define HHIVE_SIGNATURE 0xBEE0BEE0
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#define HFILE_TYPE_PRIMARY 0 // Base hive file
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#define HFILE_TYPE_ALTERNATE 1 // Alternate (e.g. system.alt)
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#define HFILE_TYPE_LOG 2 // Log (security.log)
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#define HFILE_TYPE_EXTERNAL 3 // Target of savekey, etc.
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#define HFILE_TYPE_MAX 4
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#define HHIVE_LINEAR_INDEX 16 // All computed linear indices < HHIVE_LINEAR_INDEX are valid
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#define HHIVE_EXPONENTIAL_INDEX 23 // All computed exponential indices < HHIVE_EXPONENTIAL_INDEX
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// and >= HHIVE_LINEAR_INDEX are valid.
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#define HHIVE_FREE_DISPLAY_SIZE 24
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#define HHIVE_FREE_DISPLAY_SHIFT 3 // This must be log2 of HCELL_PAD!
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#define HHIVE_FREE_DISPLAY_BIAS 7 // Add to first set bit left of cell size to get exponential index
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#define FREE_HBIN_DISCARDABLE 1
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typedef struct _FREE_HBIN {
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LIST_ENTRY ListEntry;
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ULONG Size;
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ULONG FileOffset;
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ULONG Flags;
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} FREE_HBIN, *PFREE_HBIN;
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typedef struct _HHIVE {
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ULONG Signature;
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PGET_CELL_ROUTINE GetCellRoutine;
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PALLOCATE_ROUTINE Allocate;
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PFREE_ROUTINE Free;
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PFILE_SET_SIZE_ROUTINE FileSetSize;
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PFILE_WRITE_ROUTINE FileWrite;
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PFILE_READ_ROUTINE FileRead;
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PFILE_FLUSH_ROUTINE FileFlush;
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struct _HBASE_BLOCK *BaseBlock;
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RTL_BITMAP DirtyVector; // only for Stable bins
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ULONG DirtyCount;
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ULONG DirtyAlloc; // allocated bytges for dirty vect
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ULONG Cluster; // Usually 1 512 byte sector.
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// Set up force writes to be
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// done in larger units on
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// machines with larger sectors.
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// Is number of logical 512 sectors.
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BOOLEAN Flat; // TRUE if FLAT
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BOOLEAN ReadOnly; // TRUE if READONLY
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BOOLEAN Log;
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BOOLEAN Alternate;
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ULONG HiveFlags;
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ULONG LogSize;
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ULONG RefreshCount; // debugging aid
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ULONG StorageTypeCount; // 1 > Number of largest valid
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// type. (1 for Stable only,
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// 2 for stable & volatile)
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ULONG Version; // hive version, to allow supporting multiple
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// formats simultaneously.
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struct _DUAL {
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ULONG Length;
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PHMAP_DIRECTORY Map;
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PHMAP_TABLE SmallDir;
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ULONG Guard; // Always == -1
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HCELL_INDEX FreeDisplay[HHIVE_FREE_DISPLAY_SIZE];
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ULONG FreeSummary;
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LIST_ENTRY FreeBins; // list of freed HBINs (FREE_HBIN)
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} Storage[ HTYPE_COUNT ];
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// Caller defined data goes here
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} HHIVE, *PHHIVE;
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#endif // __HIVE_DATA__
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