QED.cpp@ 42640

Last change on this file since 42640 was 40843, checked in by vboxsync, 13 years ago
Storage: Miscellaneous bug fixes to make the library work on big endian machines
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1	/* $Id: QED.cpp 40843 2012-04-10 08:53:19Z vboxsync $ */
2	/** @file
3	* QED - QED Disk image.
4	*/
5
6	/*
7	* Copyright (C) 2011 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_VD_QED
22	#include <VBox/vd-plugin.h>
23	#include <VBox/err.h>
24
25	#include <VBox/log.h>
26	#include <iprt/asm.h>
27	#include <iprt/assert.h>
28	#include <iprt/string.h>
29	#include <iprt/alloc.h>
30	#include <iprt/path.h>
31	#include <iprt/list.h>
32
33	/**
34	* The QED backend implements support for the qemu enhanced disk format (short QED)
35	* The specification for the format is available under http://wiki.qemu.org/Features/QED/Specification
36	*
37	* Missing things to implement:
38	* - compaction
39	* - resizing which requires block relocation (very rare case)
40	*/
41
42	/*******************************************************************************
43	* Structures in a QED image, little endian *
44	*******************************************************************************/
45
46	#pragma pack(1)
47	typedef struct QedHeader
48	{
49	/** Magic value. */
50	uint32_t u32Magic;
51	/** Cluster size in bytes. */
52	uint32_t u32ClusterSize;
53	/** Size of L1 and L2 tables in clusters. */
54	uint32_t u32TableSize;
55	/** size of this header structure in clusters. */
56	uint32_t u32HeaderSize;
57	/** Features used for the image. */
58	uint64_t u64FeatureFlags;
59	/** Compatibility features used for the image. */
60	uint64_t u64CompatFeatureFlags;
61	/** Self resetting feature bits. */
62	uint64_t u64AutoresetFeatureFlags;
63	/** Offset of the L1 table in bytes. */
64	uint64_t u64OffL1Table;
65	/** Logical image size as seen by the guest. */
66	uint64_t u64Size;
67	/** Offset of the backing filename in bytes. */
68	uint32_t u32OffBackingFilename;
69	/** Size of the backing filename. */
70	uint32_t u32BackingFilenameSize;
71	} QedHeader;
72	#pragma pack()
73	/** Pointer to a on disk QED header. */
74	typedef QedHeader *PQedHeader;
75
76	/** QED magic value. */
77	#define QED_MAGIC UINT32_C(0x00444551) /* QED\0 */
78	/** Cluster size minimum. */
79	#define QED_CLUSTER_SIZE_MIN RT_BIT(12)
80	/** Cluster size maximum. */
81	#define QED_CLUSTER_SIZE_MAX RT_BIT(26)
82	/** L1 and L2 Table size minimum. */
83	#define QED_TABLE_SIZE_MIN 1
84	/** L1 and L2 Table size maximum. */
85	#define QED_TABLE_SIZE_MAX 16
86
87	/** QED default cluster size when creating an image. */
88	#define QED_CLUSTER_SIZE_DEFAULT (64 * _1K)
89	/** The default table size in clusters. */
90	#define QED_TABLE_SIZE_DEFAULT 4
91
92	/** Feature flags.
93	* @{
94	*/
95	/** Image uses a backing file to provide data for unallocated clusters. */
96	#define QED_FEATURE_BACKING_FILE RT_BIT_64(0)
97	/** Image needs checking before use. */
98	#define QED_FEATURE_NEED_CHECK RT_BIT_64(1)
99	/** Don't probe for format of the backing file, treat as raw image. */
100	#define QED_FEATURE_BACKING_FILE_NO_PROBE RT_BIT_64(2)
101	/** Mask of valid features. */
102	#define QED_FEATURE_MASK (QED_FEATURE_BACKING_FILE \| QED_FEATURE_NEED_CHECK \| QED_FEATURE_BACKING_FILE_NO_PROBE)
103	/** @} */
104
105	/** Compatibility feature flags.
106	* @{
107	*/
108	/** Mask of valid compatibility features. */
109	#define QED_COMPAT_FEATURE_MASK (0)
110	/** @} */
111
112	/** Autoreset feature flags.
113	* @{
114	*/
115	/** Mask of valid autoreset features. */
116	#define QED_AUTORESET_FEATURE_MASK (0)
117	/** @} */
118
119	/*******************************************************************************
120	* Constants And Macros, Structures and Typedefs *
121	*******************************************************************************/
122
123	/**
124	* QED L2 cache entry.
125	*/
126	typedef struct QEDL2CACHEENTRY
127	{
128	/** List node for the search list. */
129	RTLISTNODE NodeSearch;
130	/** List node for the LRU list. */
131	RTLISTNODE NodeLru;
132	/** Reference counter. */
133	uint32_t cRefs;
134	/** The offset of the L2 table, used as search key. */
135	uint64_t offL2Tbl;
136	/** Pointer to the cached L2 table. */
137	uint64_t *paL2Tbl;
138	} QEDL2CACHEENTRY, *PQEDL2CACHEENTRY;
139
140	/** Maximum amount of memory the cache is allowed to use. */
141	#define QED_L2_CACHE_MEMORY_MAX (2*_1M)
142
143	/**
144	* QED image data structure.
145	*/
146	typedef struct QEDIMAGE
147	{
148	/** Image name. */
149	const char *pszFilename;
150	/** Storage handle. */
151	PVDIOSTORAGE pStorage;
152
153	/** Pointer to the per-disk VD interface list. */
154	PVDINTERFACE pVDIfsDisk;
155	/** Pointer to the per-image VD interface list. */
156	PVDINTERFACE pVDIfsImage;
157	/** Error interface. */
158	PVDINTERFACEERROR pIfError;
159	/** I/O interface. */
160	PVDINTERFACEIOINT pIfIo;
161
162	/** Open flags passed by VBoxHD layer. */
163	unsigned uOpenFlags;
164	/** Image flags defined during creation or determined during open. */
165	unsigned uImageFlags;
166	/** Total size of the image. */
167	uint64_t cbSize;
168	/** Physical geometry of this image. */
169	VDGEOMETRY PCHSGeometry;
170	/** Logical geometry of this image. */
171	VDGEOMETRY LCHSGeometry;
172
173	/** Filename of the backing file if any. */
174	char *pszBackingFilename;
175	/** Offset of the filename in the image. */
176	uint32_t offBackingFilename;
177	/** Size of the backing filename excluding \0. */
178	uint32_t cbBackingFilename;
179
180	/** Size of the image, multiple of clusters. */
181	uint64_t cbImage;
182	/** Cluster size in bytes. */
183	uint32_t cbCluster;
184	/** Number of entries in the L1 and L2 table. */
185	uint32_t cTableEntries;
186	/** Size of an L1 or L2 table rounded to the next cluster size. */
187	uint32_t cbTable;
188	/** Pointer to the L1 table. */
189	uint64_t *paL1Table;
190	/** Offset of the L1 table. */
191	uint64_t offL1Table;
192
193	/** Offset mask for a cluster. */
194	uint64_t fOffsetMask;
195	/** L1 table mask to get the L1 index. */
196	uint64_t fL1Mask;
197	/** Number of bits to shift to get the L1 index. */
198	uint32_t cL1Shift;
199	/** L2 table mask to get the L2 index. */
200	uint64_t fL2Mask;
201	/** Number of bits to shift to get the L2 index. */
202	uint32_t cL2Shift;
203
204	/** Memory occupied by the L2 table cache. */
205	size_t cbL2Cache;
206	/** The sorted L2 entry list used for searching. */
207	RTLISTNODE ListSearch;
208	/** The LRU L2 entry list used for eviction. */
209	RTLISTNODE ListLru;
210
211	} QEDIMAGE, *PQEDIMAGE;
212
213	/**
214	* State of the async cluster allocation.
215	*/
216	typedef enum QEDCLUSTERASYNCALLOCSTATE
217	{
218	/** Invalid. */
219	QEDCLUSTERASYNCALLOCSTATE_INVALID = 0,
220	/** L2 table allocation. */
221	QEDCLUSTERASYNCALLOCSTATE_L2_ALLOC,
222	/** Link L2 table into L1. */
223	QEDCLUSTERASYNCALLOCSTATE_L2_LINK,
224	/** Allocate user data cluster. */
225	QEDCLUSTERASYNCALLOCSTATE_USER_ALLOC,
226	/** Link user data cluster. */
227	QEDCLUSTERASYNCALLOCSTATE_USER_LINK,
228	/** 32bit blowup. */
229	QEDCLUSTERASYNCALLOCSTATE_32BIT_HACK = 0x7fffffff
230	} QEDCLUSTERASYNCALLOCSTATE, *PQEDCLUSTERASYNCALLOCSTATE;
231
232	/**
233	* Data needed to track async cluster allocation.
234	*/
235	typedef struct QEDCLUSTERASYNCALLOC
236	{
237	/** The state of the cluster allocation. */
238	QEDCLUSTERASYNCALLOCSTATE enmAllocState;
239	/** Old image size to rollback in case of an error. */
240	uint64_t cbImageOld;
241	/** L1 index to link if any. */
242	uint32_t idxL1;
243	/** L2 index to link, required in any case. */
244	uint32_t idxL2;
245	/** Start offset of the allocated cluster. */
246	uint64_t offClusterNew;
247	/** L2 cache entry if a L2 table is allocated. */
248	PQEDL2CACHEENTRY pL2Entry;
249	/** Number of bytes to write. */
250	size_t cbToWrite;
251	} QEDCLUSTERASYNCALLOC, *PQEDCLUSTERASYNCALLOC;
252
253	/*******************************************************************************
254	* Static Variables *
255	*******************************************************************************/
256
257	/** NULL-terminated array of supported file extensions. */
258	static const VDFILEEXTENSION s_aQedFileExtensions[] =
259	{
260	{"qed", VDTYPE_HDD},
261	{NULL, VDTYPE_INVALID}
262	};
263
264	/*******************************************************************************
265	* Internal Functions *
266	*******************************************************************************/
267
268	/**
269	* Converts the image header to the host endianess and performs basic checks.
270	*
271	* @returns Whether the given header is valid or not.
272	* @param pHeader Pointer to the header to convert.
273	*/
274	static bool qedHdrConvertToHostEndianess(PQedHeader pHeader)
275	{
276	pHeader->u32Magic = RT_LE2H_U32(pHeader->u32Magic);
277	pHeader->u32ClusterSize = RT_LE2H_U32(pHeader->u32ClusterSize);
278	pHeader->u32TableSize = RT_LE2H_U32(pHeader->u32TableSize);
279	pHeader->u32HeaderSize = RT_LE2H_U32(pHeader->u32HeaderSize);
280	pHeader->u64FeatureFlags = RT_LE2H_U64(pHeader->u64FeatureFlags);
281	pHeader->u64CompatFeatureFlags = RT_LE2H_U64(pHeader->u64CompatFeatureFlags);
282	pHeader->u64AutoresetFeatureFlags = RT_LE2H_U64(pHeader->u64AutoresetFeatureFlags);
283	pHeader->u64OffL1Table = RT_LE2H_U64(pHeader->u64OffL1Table);
284	pHeader->u64Size = RT_LE2H_U64(pHeader->u64Size);
285	pHeader->u32OffBackingFilename = RT_LE2H_U32(pHeader->u32OffBackingFilename);
286	pHeader->u32BackingFilenameSize = RT_LE2H_U32(pHeader->u32BackingFilenameSize);
287
288	if (RT_UNLIKELY(pHeader->u32Magic != QED_MAGIC))
289	return false;
290	if (RT_UNLIKELY( pHeader->u32ClusterSize < QED_CLUSTER_SIZE_MIN
291	\|\| pHeader->u32ClusterSize > QED_CLUSTER_SIZE_MAX))
292	return false;
293	if (RT_UNLIKELY( pHeader->u32TableSize < QED_TABLE_SIZE_MIN
294	\|\| pHeader->u32TableSize > QED_TABLE_SIZE_MAX))
295	return false;
296	if (RT_UNLIKELY(pHeader->u64Size % 512 != 0))
297	return false;
298
299	return true;
300	}
301
302	/**
303	* Creates a QED header from the given image state.
304	*
305	* @returns nothing.
306	* @param pImage Image instance data.
307	* @param pHeader Pointer to the header to convert.
308	*/
309	static void qedHdrConvertFromHostEndianess(PQEDIMAGE pImage, PQedHeader pHeader)
310	{
311	pHeader->u32Magic = RT_H2LE_U32(QED_MAGIC);
312	pHeader->u32ClusterSize = RT_H2LE_U32(pImage->cbCluster);
313	pHeader->u32TableSize = RT_H2LE_U32(pImage->cbTable / pImage->cbCluster);
314	pHeader->u32HeaderSize = RT_H2LE_U32(1);
315	pHeader->u64FeatureFlags = RT_H2LE_U64(pImage->pszBackingFilename ? QED_FEATURE_BACKING_FILE : UINT64_C(0));
316	pHeader->u64CompatFeatureFlags = RT_H2LE_U64(UINT64_C(0));
317	pHeader->u64AutoresetFeatureFlags = RT_H2LE_U64(UINT64_C(0));
318	pHeader->u64OffL1Table = RT_H2LE_U64(pImage->offL1Table);
319	pHeader->u64Size = RT_H2LE_U64(pImage->cbSize);
320	pHeader->u32OffBackingFilename = RT_H2LE_U32(pImage->offBackingFilename);
321	pHeader->u32BackingFilenameSize = RT_H2LE_U32(pImage->cbBackingFilename);
322	}
323
324	/**
325	* Convert table entries from little endian to host endianess.
326	*
327	* @returns nothing.
328	* @param paTbl Pointer to the table.
329	* @param cEntries Number of entries in the table.
330	*/
331	static void qedTableConvertToHostEndianess(uint64_t *paTbl, uint32_t cEntries)
332	{
333	while(cEntries-- > 0)
334	{
335	paTbl = RT_LE2H_U64(paTbl);
336	paTbl++;
337	}
338	}
339
340	/**
341	* Convert table entries from host to little endian format.
342	*
343	* @returns nothing.
344	* @param paTblImg Pointer to the table which will store the little endian table.
345	* @param paTbl The source table to convert.
346	* @param cEntries Number of entries in the table.
347	*/
348	static void qedTableConvertFromHostEndianess(uint64_t paTblImg, uint64_t paTbl,
349	uint32_t cEntries)
350	{
351	while(cEntries-- > 0)
352	{
353	paTblImg = RT_H2LE_U64(paTbl);
354	paTbl++;
355	paTblImg++;
356	}
357	}
358
359	/**
360	* Creates the L2 table cache.
361	*
362	* @returns VBox status code.
363	* @param pImage The image instance data.
364	*/
365	static int qedL2TblCacheCreate(PQEDIMAGE pImage)
366	{
367	pImage->cbL2Cache = 0;
368	RTListInit(&pImage->ListSearch);
369	RTListInit(&pImage->ListLru);
370
371	return VINF_SUCCESS;
372	}
373
374	/**
375	* Destroys the L2 table cache.
376	*
377	* @returns nothing.
378	* @param pImage The image instance data.
379	*/
380	static void qedL2TblCacheDestroy(PQEDIMAGE pImage)
381	{
382	PQEDL2CACHEENTRY pL2Entry = NULL;
383	PQEDL2CACHEENTRY pL2Next = NULL;
384
385	RTListForEachSafe(&pImage->ListSearch, pL2Entry, pL2Next, QEDL2CACHEENTRY, NodeSearch)
386	{
387	Assert(!pL2Entry->cRefs);
388
389	RTListNodeRemove(&pL2Entry->NodeSearch);
390	RTMemPageFree(pL2Entry->paL2Tbl, pImage->cbTable);
391	RTMemFree(pL2Entry);
392	}
393
394	pImage->cbL2Cache = 0;
395	RTListInit(&pImage->ListSearch);
396	RTListInit(&pImage->ListLru);
397	}
398
399	/**
400	* Returns the L2 table matching the given offset or NULL if none could be found.
401	*
402	* @returns Pointer to the L2 table cache entry or NULL.
403	* @param pImage The image instance data.
404	* @param offL2Tbl Offset of the L2 table to search for.
405	*/
406	static PQEDL2CACHEENTRY qedL2TblCacheRetain(PQEDIMAGE pImage, uint64_t offL2Tbl)
407	{
408	PQEDL2CACHEENTRY pL2Entry = NULL;
409
410	RTListForEach(&pImage->ListSearch, pL2Entry, QEDL2CACHEENTRY, NodeSearch)
411	{
412	if (pL2Entry->offL2Tbl == offL2Tbl)
413	break;
414	}
415
416	if (!RTListNodeIsDummy(&pImage->ListSearch, pL2Entry, QEDL2CACHEENTRY, NodeSearch))
417	{
418	/* Update LRU list. */
419	RTListNodeRemove(&pL2Entry->NodeLru);
420	RTListPrepend(&pImage->ListLru, &pL2Entry->NodeLru);
421	pL2Entry->cRefs++;
422	return pL2Entry;
423	}
424	else
425	return NULL;
426	}
427
428	/**
429	* Releases a L2 table cache entry.
430	*
431	* @returns nothing.
432	* @param pL2Entry The L2 cache entry.
433	*/
434	static void qedL2TblCacheEntryRelease(PQEDL2CACHEENTRY pL2Entry)
435	{
436	Assert(pL2Entry->cRefs > 0);
437	pL2Entry->cRefs--;
438	}
439
440	/**
441	* Allocates a new L2 table from the cache evicting old entries if required.
442	*
443	* @returns Pointer to the L2 cache entry or NULL.
444	* @param pImage The image instance data.
445	*/
446	static PQEDL2CACHEENTRY qedL2TblCacheEntryAlloc(PQEDIMAGE pImage)
447	{
448	PQEDL2CACHEENTRY pL2Entry = NULL;
449	int rc = VINF_SUCCESS;
450
451	if (pImage->cbL2Cache + pImage->cbTable <= QED_L2_CACHE_MEMORY_MAX)
452	{
453	/* Add a new entry. */
454	pL2Entry = (PQEDL2CACHEENTRY)RTMemAllocZ(sizeof(QEDL2CACHEENTRY));
455	if (pL2Entry)
456	{
457	pL2Entry->paL2Tbl = (uint64_t *)RTMemPageAllocZ(pImage->cbTable);
458	if (RT_UNLIKELY(!pL2Entry->paL2Tbl))
459	{
460	RTMemFree(pL2Entry);
461	pL2Entry = NULL;
462	}
463	else
464	{
465	pL2Entry->cRefs = 1;
466	pImage->cbL2Cache += pImage->cbTable;
467	}
468	}
469	}
470	else
471	{
472	/* Evict the last not in use entry and use it */
473	Assert(!RTListIsEmpty(&pImage->ListLru));
474
475	RTListForEachReverse(&pImage->ListLru, pL2Entry, QEDL2CACHEENTRY, NodeLru)
476	{
477	if (!pL2Entry->cRefs)
478	break;
479	}
480
481	if (!RTListNodeIsDummy(&pImage->ListSearch, pL2Entry, QEDL2CACHEENTRY, NodeSearch))
482	{
483	RTListNodeRemove(&pL2Entry->NodeSearch);
484	RTListNodeRemove(&pL2Entry->NodeLru);
485	pL2Entry->offL2Tbl = 0;
486	pL2Entry->cRefs = 1;
487	}
488	else
489	pL2Entry = NULL;
490	}
491
492	return pL2Entry;
493	}
494
495	/**
496	* Frees a L2 table cache entry.
497	*
498	* @returns nothing.
499	* @param pImage The image instance data.
500	* @param pL2Entry The L2 cache entry to free.
501	*/
502	static void qedL2TblCacheEntryFree(PQEDIMAGE pImage, PQEDL2CACHEENTRY pL2Entry)
503	{
504	Assert(!pL2Entry->cRefs);
505	RTMemPageFree(pL2Entry->paL2Tbl, pImage->cbTable);
506	RTMemFree(pL2Entry);
507
508	pImage->cbL2Cache -= pImage->cbTable;
509	}
510
511	/**
512	* Inserts an entry in the L2 table cache.
513	*
514	* @returns nothing.
515	* @param pImage The image instance data.
516	* @param pL2Entry The L2 cache entry to insert.
517	*/
518	static void qedL2TblCacheEntryInsert(PQEDIMAGE pImage, PQEDL2CACHEENTRY pL2Entry)
519	{
520	PQEDL2CACHEENTRY pIt = NULL;
521
522	Assert(pL2Entry->offL2Tbl > 0);
523
524	/* Insert at the top of the LRU list. */
525	RTListPrepend(&pImage->ListLru, &pL2Entry->NodeLru);
526
527	if (RTListIsEmpty(&pImage->ListSearch))
528	{
529	RTListAppend(&pImage->ListSearch, &pL2Entry->NodeSearch);
530	}
531	else
532	{
533	/* Insert into search list. */
534	pIt = RTListGetFirst(&pImage->ListSearch, QEDL2CACHEENTRY, NodeSearch);
535	if (pIt->offL2Tbl > pL2Entry->offL2Tbl)
536	RTListPrepend(&pImage->ListSearch, &pL2Entry->NodeSearch);
537	else
538	{
539	bool fInserted = false;
540
541	RTListForEach(&pImage->ListSearch, pIt, QEDL2CACHEENTRY, NodeSearch)
542	{
543	Assert(pIt->offL2Tbl != pL2Entry->offL2Tbl);
544	if (pIt->offL2Tbl < pL2Entry->offL2Tbl)
545	{
546	RTListNodeInsertAfter(&pIt->NodeSearch, &pL2Entry->NodeSearch);
547	fInserted = true;
548	break;
549	}
550	}
551	Assert(fInserted);
552	}
553	}
554	}
555
556	/**
557	* Fetches the L2 from the given offset trying the LRU cache first and
558	* reading it from the image after a cache miss.
559	*
560	* @returns VBox status code.
561	* @param pImage Image instance data.
562	* @param offL2Tbl The offset of the L2 table in the image.
563	* @param ppL2Entry Where to store the L2 table on success.
564	*/
565	static int qedL2TblCacheFetch(PQEDIMAGE pImage, uint64_t offL2Tbl, PQEDL2CACHEENTRY *ppL2Entry)
566	{
567	int rc = VINF_SUCCESS;
568
569	LogFlowFunc(("pImage=%#p offL2Tbl=%llu ppL2Entry=%#p\n", pImage, offL2Tbl, ppL2Entry));
570
571	/* Try to fetch the L2 table from the cache first. */
572	PQEDL2CACHEENTRY pL2Entry = qedL2TblCacheRetain(pImage, offL2Tbl);
573	if (!pL2Entry)
574	{
575	LogFlowFunc(("Reading L2 table from image\n"));
576	pL2Entry = qedL2TblCacheEntryAlloc(pImage);
577
578	if (pL2Entry)
579	{
580	/* Read from the image. */
581	pL2Entry->offL2Tbl = offL2Tbl;
582	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, offL2Tbl,
583	pL2Entry->paL2Tbl, pImage->cbTable, NULL);
584	if (RT_SUCCESS(rc))
585	{
586	#if defined(RT_BIG_ENDIAN)
587	qedTableConvertToHostEndianess(pL2Entry->paL2Tbl, pImage->cTableEntries);
588	#endif
589	qedL2TblCacheEntryInsert(pImage, pL2Entry);
590	}
591	else
592	{
593	qedL2TblCacheEntryRelease(pL2Entry);
594	qedL2TblCacheEntryFree(pImage, pL2Entry);
595	}
596	}
597	else
598	rc = VERR_NO_MEMORY;
599	}
600
601	if (RT_SUCCESS(rc))
602	*ppL2Entry = pL2Entry;
603
604	LogFlowFunc(("returns rc=%Rrc\n", rc));
605	return rc;
606	}
607
608	/**
609	* Fetches the L2 from the given offset trying the LRU cache first and
610	* reading it from the image after a cache miss - version for async I/O.
611	*
612	* @returns VBox status code.
613	* @param pImage Image instance data.
614	* @param pIoCtx The I/O context.
615	* @param offL2Tbl The offset of the L2 table in the image.
616	* @param ppL2Entry Where to store the L2 table on success.
617	*/
618	static int qedL2TblCacheFetchAsync(PQEDIMAGE pImage, PVDIOCTX pIoCtx,
619	uint64_t offL2Tbl, PQEDL2CACHEENTRY *ppL2Entry)
620	{
621	int rc = VINF_SUCCESS;
622
623	/* Try to fetch the L2 table from the cache first. */
624	PQEDL2CACHEENTRY pL2Entry = qedL2TblCacheRetain(pImage, offL2Tbl);
625	if (!pL2Entry)
626	{
627	pL2Entry = qedL2TblCacheEntryAlloc(pImage);
628
629	if (pL2Entry)
630	{
631	/* Read from the image. */
632	PVDMETAXFER pMetaXfer;
633
634	pL2Entry->offL2Tbl = offL2Tbl;
635	rc = vdIfIoIntFileReadMetaAsync(pImage->pIfIo, pImage->pStorage,
636	offL2Tbl, pL2Entry->paL2Tbl,
637	pImage->cbTable, pIoCtx,
638	&pMetaXfer, NULL, NULL);
639	if (RT_SUCCESS(rc))
640	{
641	vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
642	#if defined(RT_BIG_ENDIAN)
643	qedTableConvertToHostEndianess(pL2Entry->paL2Tbl, pImage->cTableEntries);
644	#endif
645	qedL2TblCacheEntryInsert(pImage, pL2Entry);
646	}
647	else
648	{
649	qedL2TblCacheEntryRelease(pL2Entry);
650	qedL2TblCacheEntryFree(pImage, pL2Entry);
651	}
652	}
653	else
654	rc = VERR_NO_MEMORY;
655	}
656
657	if (RT_SUCCESS(rc))
658	*ppL2Entry = pL2Entry;
659
660	return rc;
661	}
662
663	/**
664	* Return power of 2 or 0 if num error.
665	*
666	* @returns The power of 2 or 0 if the given number is not a power of 2.
667	* @param u32 The number.
668	*/
669	static uint32_t qedGetPowerOfTwo(uint32_t u32)
670	{
671	if (u32 == 0)
672	return 0;
673	uint32_t uPower2 = 0;
674	while ((u32 & 1) == 0)
675	{
676	u32 >>= 1;
677	uPower2++;
678	}
679	return u32 == 1 ? uPower2 : 0;
680	}
681
682	/**
683	* Sets the L1, L2 and offset bitmasks and L1 and L2 bit shift members.
684	*
685	* @returns nothing.
686	* @param pImage The image instance data.
687	*/
688	static void qedTableMasksInit(PQEDIMAGE pImage)
689	{
690	uint32_t cClusterBits, cTableBits;
691
692	cClusterBits = qedGetPowerOfTwo(pImage->cbCluster);
693	cTableBits = qedGetPowerOfTwo(pImage->cTableEntries);
694
695	Assert(cClusterBits + 2 * cTableBits <= 64);
696
697	pImage->fOffsetMask = ((uint64_t)pImage->cbCluster - 1);
698	pImage->fL2Mask = ((uint64_t)pImage->cTableEntries - 1) << cClusterBits;
699	pImage->cL2Shift = cClusterBits;
700	pImage->fL1Mask = ((uint64_t)pImage->cTableEntries - 1) << (cClusterBits + cTableBits);
701	pImage->cL1Shift = cClusterBits + cTableBits;
702	}
703
704	/**
705	* Converts a given logical offset into the
706	*
707	* @returns nothing.
708	* @param pImage The image instance data.
709	* @param off The logical offset to convert.
710	* @param pidxL1 Where to store the index in the L1 table on success.
711	* @param pidxL2 Where to store the index in the L2 table on success.
712	* @param poffCluster Where to store the offset in the cluster on success.
713	*/
714	DECLINLINE(void) qedConvertLogicalOffset(PQEDIMAGE pImage, uint64_t off, uint32_t *pidxL1,
715	uint32_t pidxL2, uint32_t poffCluster)
716	{
717	AssertPtr(pidxL1);
718	AssertPtr(pidxL2);
719	AssertPtr(poffCluster);
720
721	*poffCluster = off & pImage->fOffsetMask;
722	*pidxL1 = (off & pImage->fL1Mask) >> pImage->cL1Shift;
723	*pidxL2 = (off & pImage->fL2Mask) >> pImage->cL2Shift;
724	}
725
726	/**
727	* Converts Cluster size to a byte size.
728	*
729	* @returns Number of bytes derived from the given number of clusters.
730	* @param pImage The image instance data.
731	* @param cClusters The clusters to convert.
732	*/
733	DECLINLINE(uint64_t) qedCluster2Byte(PQEDIMAGE pImage, uint64_t cClusters)
734	{
735	return cClusters * pImage->cbCluster;
736	}
737
738	/**
739	* Converts number of bytes to cluster size rounding to the next cluster.
740	*
741	* @returns Number of bytes derived from the given number of clusters.
742	* @param pImage The image instance data.
743	* @param cb Number of bytes to convert.
744	*/
745	DECLINLINE(uint64_t) qedByte2Cluster(PQEDIMAGE pImage, uint64_t cb)
746	{
747	return cb / pImage->cbCluster + (cb % pImage->cbCluster ? 1 : 0);
748	}
749
750	/**
751	* Allocates a new cluster in the image.
752	*
753	* @returns The start offset of the new cluster in the image.
754	* @param pImage The image instance data.
755	* @param cCLusters Number of clusters to allocate.
756	*/
757	DECLINLINE(uint64_t) qedClusterAllocate(PQEDIMAGE pImage, uint32_t cClusters)
758	{
759	uint64_t offCluster;
760
761	offCluster = pImage->cbImage;
762	pImage->cbImage += cClusters*pImage->cbCluster;
763
764	return offCluster;
765	}
766
767	/**
768	* Returns the real image offset for a given cluster or an error if the cluster is not
769	* yet allocated.
770	*
771	* @returns VBox status code.
772	* VERR_VD_BLOCK_FREE if the cluster is not yet allocated.
773	* @param pImage The image instance data.
774	* @param idxL1 The L1 index.
775	* @param idxL2 The L2 index.
776	* @param offCluster Offset inside the cluster.
777	* @param poffImage Where to store the image offset on success;
778	*/
779	static int qedConvertToImageOffset(PQEDIMAGE pImage, uint32_t idxL1, uint32_t idxL2,
780	uint32_t offCluster, uint64_t *poffImage)
781	{
782	int rc = VERR_VD_BLOCK_FREE;
783	LogFlowFunc(("pImage=%#p idxL1=%u idxL2=%u offCluster=%u poffImage=%#p\n",
784	pImage, idxL1, idxL2, offCluster, poffImage));
785
786	AssertReturn(idxL1 < pImage->cTableEntries, VERR_INVALID_PARAMETER);
787	AssertReturn(idxL2 < pImage->cTableEntries, VERR_INVALID_PARAMETER);
788
789	if (pImage->paL1Table[idxL1])
790	{
791	PQEDL2CACHEENTRY pL2Entry;
792
793	rc = qedL2TblCacheFetch(pImage, pImage->paL1Table[idxL1], &pL2Entry);
794	if (RT_SUCCESS(rc))
795	{
796	LogFlowFunc(("cluster start offset %llu\n", pL2Entry->paL2Tbl[idxL2]));
797	/* Get real file offset. */
798	if (pL2Entry->paL2Tbl[idxL2])
799	*poffImage = pL2Entry->paL2Tbl[idxL2] + offCluster;
800	else
801	rc = VERR_VD_BLOCK_FREE;
802
803	qedL2TblCacheEntryRelease(pL2Entry);
804	}
805	}
806
807	LogFlowFunc(("returns rc=%Rrc\n", rc));
808	return rc;
809	}
810
811	/**
812	* Returns the real image offset for a given cluster or an error if the cluster is not
813	* yet allocated- version for async I/O.
814	*
815	* @returns VBox status code.
816	* VERR_VD_BLOCK_FREE if the cluster is not yet allocated.
817	* @param pImage The image instance data.
818	* @param pIoCtx The I/O context.
819	* @param idxL1 The L1 index.
820	* @param idxL2 The L2 index.
821	* @param offCluster Offset inside the cluster.
822	* @param poffImage Where to store the image offset on success;
823	*/
824	static int qedConvertToImageOffsetAsync(PQEDIMAGE pImage, PVDIOCTX pIoCtx,
825	uint32_t idxL1, uint32_t idxL2,
826	uint32_t offCluster, uint64_t *poffImage)
827	{
828	int rc = VERR_VD_BLOCK_FREE;
829
830	AssertReturn(idxL1 < pImage->cTableEntries, VERR_INVALID_PARAMETER);
831	AssertReturn(idxL2 < pImage->cTableEntries, VERR_INVALID_PARAMETER);
832
833	if (pImage->paL1Table[idxL1])
834	{
835	PQEDL2CACHEENTRY pL2Entry;
836
837	rc = qedL2TblCacheFetchAsync(pImage, pIoCtx, pImage->paL1Table[idxL1],
838	&pL2Entry);
839	if (RT_SUCCESS(rc))
840	{
841	/* Get real file offset. */
842	if (pL2Entry->paL2Tbl[idxL2])
843	*poffImage = pL2Entry->paL2Tbl[idxL2] + offCluster;
844	else
845	rc = VERR_VD_BLOCK_FREE;
846
847	qedL2TblCacheEntryRelease(pL2Entry);
848	}
849	}
850
851	return rc;
852	}
853
854
855	/**
856	* Internal. Flush image data to disk.
857	*/
858	static int qedFlushImage(PQEDIMAGE pImage)
859	{
860	int rc = VINF_SUCCESS;
861
862	if ( pImage->pStorage
863	&& !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
864	{
865	QedHeader Header;
866
867	Assert(!(pImage->cbTable % pImage->cbCluster));
868	#if defined(RT_BIG_ENDIAN)
869	uint64_t paL1TblImg = (uint64_t )RTMemAllocZ(pImage->cbTable);
870	if (paL1TblImg)
871	{
872	qedTableConvertFromHostEndianess(paL1TblImg, pImage->paL1Table,
873	pImage->cTableEntries);
874	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
875	pImage->offL1Table, paL1TblImg,
876	pImage->cbTable, NULL);
877	RTMemFree(paL1TblImg);
878	}
879	else
880	rc = VERR_NO_MEMORY;
881	#else
882	/* Write L1 table directly. */
883	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->offL1Table,
884	pImage->paL1Table, pImage->cbTable, NULL);
885	#endif
886	if (RT_SUCCESS(rc))
887	{
888	/* Write header. */
889	qedHdrConvertFromHostEndianess(pImage, &Header);
890	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Header,
891	sizeof(Header), NULL);
892	if (RT_SUCCESS(rc))
893	rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
894	}
895	}
896
897	return rc;
898	}
899
900	/**
901	* Flush image data to disk - version for async I/O.
902	*
903	* @returns VBox status code.
904	* @param pImage The image instance data.
905	* @param pIoCtx The I/o context
906	*/
907	static int qedFlushImageAsync(PQEDIMAGE pImage, PVDIOCTX pIoCtx)
908	{
909	int rc = VINF_SUCCESS;
910
911	if ( pImage->pStorage
912	&& !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
913	{
914	QedHeader Header;
915
916	Assert(!(pImage->cbTable % pImage->cbCluster));
917	#if defined(RT_BIG_ENDIAN)
918	uint64_t paL1TblImg = (uint64_t )RTMemAllocZ(pImage->cbTable);
919	if (paL1TblImg)
920	{
921	qedTableConvertFromHostEndianess(paL1TblImg, pImage->paL1Table,
922	pImage->cTableEntries);
923	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
924	pImage->offL1Table, paL1TblImg,
925	pImage->cbTable, pIoCtx, NULL, NULL);
926	RTMemFree(paL1TblImg);
927	}
928	else
929	rc = VERR_NO_MEMORY;
930	#else
931	/* Write L1 table directly. */
932	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
933	pImage->offL1Table, pImage->paL1Table,
934	pImage->cbTable, pIoCtx, NULL, NULL);
935	#endif
936	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
937	{
938	/* Write header. */
939	qedHdrConvertFromHostEndianess(pImage, &Header);
940	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
941	0, &Header, sizeof(Header),
942	pIoCtx, NULL, NULL);
943	if (RT_SUCCESS(rc) \|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
944	rc = vdIfIoIntFileFlushAsync(pImage->pIfIo, pImage->pStorage,
945	pIoCtx, NULL, NULL);
946	}
947	}
948
949	return rc;
950	}
951
952	/**
953	* Checks whether the given cluster offset is valid.
954	*
955	* @returns Whether the given cluster offset is valid.
956	* @param offCluster The table offset to check.
957	* @param cbFile The real file size of the image.
958	* @param cbCluster The cluster size in bytes.
959	*/
960	DECLINLINE(bool) qedIsClusterOffsetValid(uint64_t offCluster, uint64_t cbFile, size_t cbCluster)
961	{
962	return (offCluster <= cbFile - cbCluster)
963	&& !(offCluster & (cbCluster - 1));
964	}
965
966	/**
967	* Checks whether the given table offset is valid.
968	*
969	* @returns Whether the given table offset is valid.
970	* @param offTbl The table offset to check.
971	* @param cbFile The real file size of the image.
972	* @param cbTable The table size in bytes.
973	* @param cbCluster The cluster size in bytes.
974	*/
975	DECLINLINE(bool) qedIsTblOffsetValid(uint64_t offTbl, uint64_t cbFile, size_t cbTable, size_t cbCluster)
976	{
977	return (offTbl <= cbFile - cbTable)
978	&& !(offTbl & (cbCluster - 1));
979	}
980
981	/**
982	* Sets the specified range in the cluster bitmap checking whether any of the clusters is already
983	* used before.
984	*
985	* @returns Whether the range was clear and is set now.
986	* @param pvClusterBitmap The cluster bitmap to use.
987	* @param offClusterStart The first cluster to check and set.
988	* @param offClusterEnd The first cluster to not check and set anymore.
989	*/
990	static bool qedClusterBitmapCheckAndSet(void *pvClusterBitmap, uint32_t offClusterStart, uint32_t offClusterEnd)
991	{
992	for (uint32_t offCluster = offClusterStart; offCluster < offClusterEnd; offCluster++)
993	if (ASMBitTest(pvClusterBitmap, offCluster))
994	return false;
995
996	ASMBitSetRange(pvClusterBitmap, offClusterStart, offClusterEnd);
997	return true;
998	}
999
1000	/**
1001	* Checks the given image for consistency, usually called when the
1002	* QED_FEATURE_NEED_CHECK bit is set.
1003	*
1004	* @returns VBox status code.
1005	* @retval VINF_SUCCESS when the image can be accessed.
1006	* @param pImage The image instance data.
1007	* @param pHeader The header to use for checking.
1008	*
1009	* @note It is not required that the image state is fully initialized Only
1010	* The I/O interface and storage handle need to be valid.
1011	* @note The header must be converted to the host CPU endian format already
1012	* and should be validated already.
1013	*/
1014	static int qedCheckImage(PQEDIMAGE pImage, PQedHeader pHeader)
1015	{
1016	uint64_t cbFile;
1017	uint32_t cbTable;
1018	uint32_t cTableEntries;
1019	uint64_t *paL1Tbl = NULL;
1020	uint64_t *paL2Tbl = NULL;
1021	void *pvClusterBitmap = NULL;
1022	uint32_t offClusterStart;
1023	int rc = VINF_SUCCESS;
1024
1025	pImage->cbCluster = pHeader->u32ClusterSize;
1026	cbTable = pHeader->u32TableSize * pHeader->u32ClusterSize;
1027	cTableEntries = cbTable / sizeof(uint64_t);
1028
1029	do
1030	{
1031	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
1032	if (RT_FAILURE(rc))
1033	{
1034	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1035	N_("Qed: Querying the file size of image '%s' failed"),
1036	pImage->pszFilename);
1037	break;
1038	}
1039
1040	/* Allocate L1 table. */
1041	paL1Tbl = (uint64_t *)RTMemAllocZ(cbTable);
1042	if (!paL1Tbl)
1043	{
1044	rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
1045	N_("Qed: Allocating memory for the L1 table for image '%s' failed"),
1046	pImage->pszFilename);
1047	break;
1048	}
1049
1050	paL2Tbl = (uint64_t *)RTMemAllocZ(cbTable);
1051	if (!paL2Tbl)
1052	{
1053	rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
1054	N_("Qed: Allocating memory for the L2 table for image '%s' failed"),
1055	pImage->pszFilename);
1056	break;
1057	}
1058
1059	pvClusterBitmap = RTMemAllocZ(cbFile / pHeader->u32ClusterSize / 8);
1060	if (!pvClusterBitmap)
1061	{
1062	rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
1063	N_("Qed: Allocating memory for the cluster bitmap for image '%s' failed"),
1064	pImage->pszFilename);
1065	break;
1066	}
1067
1068	/* Validate L1 table offset. */
1069	if (!qedIsTblOffsetValid(pHeader->u64OffL1Table, cbFile, cbTable, pHeader->u32ClusterSize))
1070	{
1071	rc = vdIfError(pImage->pIfError, VERR_VD_GEN_INVALID_HEADER, RT_SRC_POS,
1072	N_("Qed: L1 table offset of image '%s' is corrupt (%llu)"),
1073	pImage->pszFilename, pHeader->u64OffL1Table);
1074	break;
1075	}
1076
1077	/* Read L1 table. */
1078	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1079	pHeader->u64OffL1Table, paL1Tbl, cbTable, NULL);
1080	if (RT_FAILURE(rc))
1081	{
1082	rc = vdIfError(pImage->pIfError, VERR_VD_GEN_INVALID_HEADER, RT_SRC_POS,
1083	N_("Qed: Reading the L1 table from image '%s' failed"),
1084	pImage->pszFilename);
1085	break;
1086	}
1087
1088	/* Mark the L1 table in cluster bitmap. */
1089	ASMBitSet(pvClusterBitmap, 0); /* Header is always in cluster 0. */
1090	offClusterStart = qedByte2Cluster(pImage, pHeader->u64OffL1Table);
1091	bool fSet = qedClusterBitmapCheckAndSet(pvClusterBitmap, offClusterStart, offClusterStart + pHeader->u32TableSize);
1092	Assert(fSet);
1093
1094	/* Scan the L1 and L2 tables for invalid entries. */
1095	qedTableConvertToHostEndianess(paL1Tbl, cTableEntries);
1096
1097	for (unsigned iL1 = 0; iL1 < cTableEntries; iL1++)
1098	{
1099	if (!paL1Tbl[iL1])
1100	continue; /* Skip unallocated clusters. */
1101
1102	if (!qedIsTblOffsetValid(paL1Tbl[iL1], cbFile, cbTable, pHeader->u32ClusterSize))
1103	{
1104	rc = vdIfError(pImage->pIfError, VERR_VD_GEN_INVALID_HEADER, RT_SRC_POS,
1105	N_("Qed: Entry %d of the L1 table from image '%s' is invalid (%llu)"),
1106	iL1, pImage->pszFilename, paL1Tbl[iL1]);
1107	break;
1108	}
1109
1110	/* Now check that the clusters are not allocated already. */
1111	offClusterStart = qedByte2Cluster(pImage, paL1Tbl[iL1]);
1112	fSet = qedClusterBitmapCheckAndSet(pvClusterBitmap, offClusterStart, offClusterStart + pHeader->u32TableSize);
1113	if (!fSet)
1114	{
1115	rc = vdIfError(pImage->pIfError, VERR_VD_GEN_INVALID_HEADER, RT_SRC_POS,
1116	N_("Qed: Entry %d of the L1 table from image '%s' points to a already used cluster (%llu)"),
1117	iL1, pImage->pszFilename, paL1Tbl[iL1]);
1118	break;
1119	}
1120
1121	/* Read the linked L2 table and check it. */
1122	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1123	paL1Tbl[iL1], paL2Tbl, cbTable, NULL);
1124	if (RT_FAILURE(rc))
1125	{
1126	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1127	N_("Qed: Reading the L2 table from image '%s' failed"),
1128	pImage->pszFilename);
1129	break;
1130	}
1131
1132	/* Check all L2 entries. */
1133	for (unsigned iL2 = 0; iL2 < cTableEntries; iL2++)
1134	{
1135	if (paL2Tbl[iL2])
1136	continue; /* Skip unallocated clusters. */
1137
1138	if (!qedIsClusterOffsetValid(paL2Tbl[iL2], cbFile, pHeader->u32ClusterSize))
1139	{
1140	rc = vdIfError(pImage->pIfError, VERR_VD_GEN_INVALID_HEADER, RT_SRC_POS,
1141	N_("Qed: Entry %d of the L2 table from image '%s' is invalid (%llu)"),
1142	iL2, pImage->pszFilename, paL2Tbl[iL2]);
1143	break;
1144	}
1145
1146	/* Now check that the clusters are not allocated already. */
1147	offClusterStart = qedByte2Cluster(pImage, paL2Tbl[iL2]);
1148	fSet = qedClusterBitmapCheckAndSet(pvClusterBitmap, offClusterStart, offClusterStart + 1);
1149	if (!fSet)
1150	{
1151	rc = vdIfError(pImage->pIfError, VERR_VD_GEN_INVALID_HEADER, RT_SRC_POS,
1152	N_("Qed: Entry %d of the L2 table from image '%s' points to a already used cluster (%llu)"),
1153	iL2, pImage->pszFilename, paL2Tbl[iL2]);
1154	break;
1155	}
1156	}
1157	}
1158	} while(0);
1159
1160	if (paL1Tbl)
1161	RTMemFree(paL1Tbl);
1162	if (paL2Tbl)
1163	RTMemFree(paL2Tbl);
1164	if (pvClusterBitmap)
1165	RTMemFree(pvClusterBitmap);
1166
1167	return rc;
1168	}
1169
1170	/**
1171	* Internal. Free all allocated space for representing an image except pImage,
1172	* and optionally delete the image from disk.
1173	*/
1174	static int qedFreeImage(PQEDIMAGE pImage, bool fDelete)
1175	{
1176	int rc = VINF_SUCCESS;
1177
1178	/* Freeing a never allocated image (e.g. because the open failed) is
1179	* not signalled as an error. After all nothing bad happens. */
1180	if (pImage)
1181	{
1182	if (pImage->pStorage)
1183	{
1184	/* No point updating the file that is deleted anyway. */
1185	if (!fDelete)
1186	qedFlushImage(pImage);
1187
1188	vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
1189	pImage->pStorage = NULL;
1190	}
1191
1192	if (pImage->paL1Table)
1193	RTMemFree(pImage->paL1Table);
1194
1195	if (pImage->pszBackingFilename)
1196	RTMemFree(pImage->pszBackingFilename);
1197
1198	qedL2TblCacheDestroy(pImage);
1199
1200	if (fDelete && pImage->pszFilename)
1201	vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
1202	}
1203
1204	LogFlowFunc(("returns %Rrc\n", rc));
1205	return rc;
1206	}
1207
1208	/**
1209	* Internal: Open an image, constructing all necessary data structures.
1210	*/
1211	static int qedOpenImage(PQEDIMAGE pImage, unsigned uOpenFlags)
1212	{
1213	int rc;
1214
1215	pImage->uOpenFlags = uOpenFlags;
1216
1217	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
1218	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
1219	AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
1220
1221	/*
1222	* Open the image.
1223	*/
1224	rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
1225	VDOpenFlagsToFileOpenFlags(uOpenFlags,
1226	false /* fCreate */),
1227	&pImage->pStorage);
1228	if (RT_FAILURE(rc))
1229	{
1230	/* Do NOT signal an appropriate error here, as the VD layer has the
1231	* choice of retrying the open if it failed. */
1232	goto out;
1233	}
1234
1235	uint64_t cbFile;
1236	QedHeader Header;
1237	rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
1238	if (RT_FAILURE(rc))
1239	goto out;
1240	if (cbFile > sizeof(Header))
1241	{
1242	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0, &Header, sizeof(Header), NULL);
1243	if ( RT_SUCCESS(rc)
1244	&& qedHdrConvertToHostEndianess(&Header))
1245	{
1246	if ( !(Header.u64FeatureFlags & ~QED_FEATURE_MASK)
1247	&& !(Header.u64FeatureFlags & QED_FEATURE_BACKING_FILE_NO_PROBE))
1248	{
1249	if (Header.u64FeatureFlags & QED_FEATURE_NEED_CHECK)
1250	{
1251	/* Image needs checking. */
1252	if (!(uOpenFlags & VD_OPEN_FLAGS_READONLY))
1253	rc = qedCheckImage(pImage, &Header);
1254	else
1255	rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1256	N_("Qed: Image '%s' needs checking but is opened readonly"),
1257	pImage->pszFilename);
1258	}
1259
1260	if ( RT_SUCCESS(rc)
1261	&& (Header.u64FeatureFlags & QED_FEATURE_BACKING_FILE))
1262	{
1263	/* Load backing filename from image. */
1264	pImage->pszFilename = (char )RTMemAllocZ(Header.u32BackingFilenameSize + 1); / +1 for \0 terminator. */
1265	if (pImage->pszFilename)
1266	{
1267	pImage->cbBackingFilename = Header.u32BackingFilenameSize;
1268	pImage->offBackingFilename = Header.u32OffBackingFilename;
1269	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1270	Header.u32OffBackingFilename, pImage->pszBackingFilename,
1271	Header.u32BackingFilenameSize, NULL);
1272	}
1273	else
1274	rc = VERR_NO_MEMORY;
1275	}
1276
1277	if (RT_SUCCESS(rc))
1278	{
1279	pImage->cbImage = cbFile;
1280	pImage->cbCluster = Header.u32ClusterSize;
1281	pImage->cbTable = Header.u32TableSize * pImage->cbCluster;
1282	pImage->cTableEntries = pImage->cbTable / sizeof(uint64_t);
1283	pImage->offL1Table = Header.u64OffL1Table;
1284	pImage->cbSize = Header.u64Size;
1285	qedTableMasksInit(pImage);
1286
1287	/* Allocate L1 table. */
1288	pImage->paL1Table = (uint64_t *)RTMemAllocZ(pImage->cbTable);
1289	if (pImage->paL1Table)
1290	{
1291	/* Read from the image. */
1292	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1293	pImage->offL1Table, pImage->paL1Table,
1294	pImage->cbTable, NULL);
1295	if (RT_SUCCESS(rc))
1296	{
1297	qedTableConvertToHostEndianess(pImage->paL1Table, pImage->cTableEntries);
1298	rc = qedL2TblCacheCreate(pImage);
1299	if (RT_SUCCESS(rc))
1300	{
1301	/* If the consistency check succeeded, clear the flag by flushing the image. */
1302	if (Header.u64FeatureFlags & QED_FEATURE_NEED_CHECK)
1303	rc = qedFlushImage(pImage);
1304	}
1305	else
1306	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1307	N_("Qed: Creating the L2 table cache for image '%s' failed"),
1308	pImage->pszFilename);
1309	}
1310	else
1311	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1312	N_("Qed: Reading the L1 table for image '%s' failed"),
1313	pImage->pszFilename);
1314	}
1315	else
1316	rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
1317	N_("Qed: Out of memory allocating L1 table for image '%s'"),
1318	pImage->pszFilename);
1319	}
1320	}
1321	else
1322	rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1323	N_("Qed: The image '%s' makes use of unsupported features"),
1324	pImage->pszFilename);
1325	}
1326	else if (RT_SUCCESS(rc))
1327	rc = VERR_VD_GEN_INVALID_HEADER;
1328	}
1329	else
1330	rc = VERR_VD_GEN_INVALID_HEADER;
1331
1332	out:
1333	if (RT_FAILURE(rc))
1334	qedFreeImage(pImage, false);
1335	return rc;
1336	}
1337
1338	/**
1339	* Internal: Create a qed image.
1340	*/
1341	static int qedCreateImage(PQEDIMAGE pImage, uint64_t cbSize,
1342	unsigned uImageFlags, const char *pszComment,
1343	PCVDGEOMETRY pPCHSGeometry,
1344	PCVDGEOMETRY pLCHSGeometry, unsigned uOpenFlags,
1345	PFNVDPROGRESS pfnProgress, void *pvUser,
1346	unsigned uPercentStart, unsigned uPercentSpan)
1347	{
1348	int rc;
1349	int32_t fOpen;
1350
1351	if (uImageFlags & VD_IMAGE_FLAGS_FIXED)
1352	{
1353	rc = vdIfError(pImage->pIfError, VERR_VD_INVALID_TYPE, RT_SRC_POS, N_("Qed: cannot create fixed image '%s'"), pImage->pszFilename);
1354	goto out;
1355	}
1356
1357	pImage->uOpenFlags = uOpenFlags & ~VD_OPEN_FLAGS_READONLY;
1358	pImage->uImageFlags = uImageFlags;
1359	pImage->PCHSGeometry = *pPCHSGeometry;
1360	pImage->LCHSGeometry = *pLCHSGeometry;
1361
1362	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
1363	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
1364	AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
1365
1366	/* Create image file. */
1367	fOpen = VDOpenFlagsToFileOpenFlags(pImage->uOpenFlags, true /* fCreate */);
1368	rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename, fOpen, &pImage->pStorage);
1369	if (RT_FAILURE(rc))
1370	{
1371	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("Qed: cannot create image '%s'"), pImage->pszFilename);
1372	goto out;
1373	}
1374
1375	/* Init image state. */
1376	pImage->cbSize = cbSize;
1377	pImage->cbCluster = QED_CLUSTER_SIZE_DEFAULT;
1378	pImage->cbTable = qedCluster2Byte(pImage, QED_TABLE_SIZE_DEFAULT);
1379	pImage->cTableEntries = pImage->cbTable / sizeof(uint64_t);
1380	pImage->offL1Table = qedCluster2Byte(pImage, 1); /* Cluster 0 is the header. */
1381	pImage->cbImage = (1 * pImage->cbCluster) + pImage->cbTable; /* Header + L1 table size. */
1382	pImage->cbBackingFilename = 0;
1383	pImage->offBackingFilename = 0;
1384	qedTableMasksInit(pImage);
1385
1386	/* Init L1 table. */
1387	pImage->paL1Table = (uint64_t *)RTMemAllocZ(pImage->cbTable);
1388	if (!pImage->paL1Table)
1389	{
1390	rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("Qed: cannot allocate memory for L1 table of image '%s'"),
1391	pImage->pszFilename);
1392	goto out;
1393	}
1394
1395	rc = qedL2TblCacheCreate(pImage);
1396	if (RT_FAILURE(rc))
1397	{
1398	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("Qed: Failed to create L2 cache for image '%s'"),
1399	pImage->pszFilename);
1400	goto out;
1401	}
1402
1403	if (RT_SUCCESS(rc) && pfnProgress)
1404	pfnProgress(pvUser, uPercentStart + uPercentSpan * 98 / 100);
1405
1406	rc = qedFlushImage(pImage);
1407
1408	out:
1409	if (RT_SUCCESS(rc) && pfnProgress)
1410	pfnProgress(pvUser, uPercentStart + uPercentSpan);
1411
1412	if (RT_FAILURE(rc))
1413	qedFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
1414	return rc;
1415	}
1416
1417	/**
1418	* Rollback anything done during async cluster allocation.
1419	*
1420	* @returns VBox status code.
1421	* @param pImage The image instance data.
1422	* @param pIoCtx The I/O context.
1423	* @param pClusterAlloc The cluster allocation to rollback.
1424	*/
1425	static int qedAsyncClusterAllocRollback(PQEDIMAGE pImage, PVDIOCTX pIoCtx, PQEDCLUSTERASYNCALLOC pClusterAlloc)
1426	{
1427	int rc = VINF_SUCCESS;
1428
1429	switch (pClusterAlloc->enmAllocState)
1430	{
1431	case QEDCLUSTERASYNCALLOCSTATE_L2_ALLOC:
1432	case QEDCLUSTERASYNCALLOCSTATE_L2_LINK:
1433	{
1434	/* Assumption right now is that the L1 table is not modified if the link fails. */
1435	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pClusterAlloc->cbImageOld);
1436	qedL2TblCacheEntryRelease(pClusterAlloc->pL2Entry); /* Release L2 cache entry. */
1437	qedL2TblCacheEntryFree(pImage, pClusterAlloc->pL2Entry); /* Free it, it is not in the cache yet. */
1438	break;
1439	}
1440	case QEDCLUSTERASYNCALLOCSTATE_USER_ALLOC:
1441	case QEDCLUSTERASYNCALLOCSTATE_USER_LINK:
1442	{
1443	/* Assumption right now is that the L2 table is not modified if the link fails. */
1444	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pClusterAlloc->cbImageOld);
1445	qedL2TblCacheEntryRelease(pClusterAlloc->pL2Entry); /* Release L2 cache entry. */
1446	break;
1447	}
1448	default:
1449	AssertMsgFailed(("Invalid cluster allocation state %d\n", pClusterAlloc->enmAllocState));
1450	rc = VERR_INVALID_STATE;
1451	}
1452
1453	RTMemFree(pClusterAlloc);
1454	return rc;
1455	}
1456
1457	/**
1458	* Updates the state of the async cluster allocation.
1459	*
1460	* @returns VBox status code.
1461	* @param pBackendData The opaque backend data.
1462	* @param pIoCtx I/O context associated with this request.
1463	* @param pvUser Opaque user data passed during a read/write request.
1464	* @param rcReq Status code for the completed request.
1465	*/
1466	static DECLCALLBACK(int) qedAsyncClusterAllocUpdate(void pBackendData, PVDIOCTX pIoCtx, void pvUser, int rcReq)
1467	{
1468	int rc = VINF_SUCCESS;
1469	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
1470	PQEDCLUSTERASYNCALLOC pClusterAlloc = (PQEDCLUSTERASYNCALLOC)pvUser;
1471
1472	if (RT_FAILURE(rcReq))
1473	return qedAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1474
1475	AssertPtr(pClusterAlloc->pL2Entry);
1476
1477	switch (pClusterAlloc->enmAllocState)
1478	{
1479	case QEDCLUSTERASYNCALLOCSTATE_L2_ALLOC:
1480	{
1481	uint64_t offUpdateLe = RT_H2LE_U64(pClusterAlloc->pL2Entry->offL2Tbl);
1482
1483	/* Update the link in the on disk L1 table now. */
1484	pClusterAlloc->enmAllocState = QEDCLUSTERASYNCALLOCSTATE_L2_LINK;
1485	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
1486	pImage->offL1Table + pClusterAlloc->idxL1*sizeof(uint64_t),
1487	&offUpdateLe, sizeof(uint64_t), pIoCtx,
1488	qedAsyncClusterAllocUpdate, pClusterAlloc);
1489	if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1490	break;
1491	else if (RT_FAILURE(rc))
1492	{
1493	/* Rollback. */
1494	qedAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1495	break;
1496	}
1497	/* Success, fall through. */
1498	}
1499	case QEDCLUSTERASYNCALLOCSTATE_L2_LINK:
1500	{
1501	/* L2 link updated in L1 , save L2 entry in cache and allocate new user data cluster. */
1502	uint64_t offData = qedClusterAllocate(pImage, 1);
1503
1504	/* Update the link in the in memory L1 table now. */
1505	pImage->paL1Table[pClusterAlloc->idxL1] = pClusterAlloc->pL2Entry->offL2Tbl;
1506	qedL2TblCacheEntryInsert(pImage, pClusterAlloc->pL2Entry);
1507
1508	pClusterAlloc->enmAllocState = QEDCLUSTERASYNCALLOCSTATE_USER_ALLOC;
1509	pClusterAlloc->cbImageOld = offData;
1510	pClusterAlloc->offClusterNew = offData;
1511
1512	/* Write data. */
1513	rc = vdIfIoIntFileWriteUserAsync(pImage->pIfIo, pImage->pStorage,
1514	offData, pIoCtx, pClusterAlloc->cbToWrite,
1515	qedAsyncClusterAllocUpdate, pClusterAlloc);
1516	if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1517	break;
1518	else if (RT_FAILURE(rc))
1519	{
1520	qedAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1521	RTMemFree(pClusterAlloc);
1522	break;
1523	}
1524	}
1525	case QEDCLUSTERASYNCALLOCSTATE_USER_ALLOC:
1526	{
1527	uint64_t offUpdateLe = RT_H2LE_U64(pClusterAlloc->offClusterNew);
1528
1529	pClusterAlloc->enmAllocState = QEDCLUSTERASYNCALLOCSTATE_USER_LINK;
1530
1531	/* Link L2 table and update it. */
1532	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
1533	pImage->paL1Table[pClusterAlloc->idxL1] + pClusterAlloc->idxL2*sizeof(uint64_t),
1534	&offUpdateLe, sizeof(uint64_t), pIoCtx,
1535	qedAsyncClusterAllocUpdate, pClusterAlloc);
1536	if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1537	break;
1538	else if (RT_FAILURE(rc))
1539	{
1540	qedAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1541	RTMemFree(pClusterAlloc);
1542	break;
1543	}
1544	}
1545	case QEDCLUSTERASYNCALLOCSTATE_USER_LINK:
1546	{
1547	/* Everything done without errors, signal completion. */
1548	pClusterAlloc->pL2Entry->paL2Tbl[pClusterAlloc->idxL2] = pClusterAlloc->offClusterNew;
1549	qedL2TblCacheEntryRelease(pClusterAlloc->pL2Entry);
1550	RTMemFree(pClusterAlloc);
1551	rc = VINF_SUCCESS;
1552	break;
1553	}
1554	default:
1555	AssertMsgFailed(("Invalid async cluster allocation state %d\n",
1556	pClusterAlloc->enmAllocState));
1557	}
1558
1559	return rc;
1560	}
1561
1562	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
1563	static int qedCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1564	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
1565	{
1566	LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
1567	PVDIOSTORAGE pStorage = NULL;
1568	uint64_t cbFile;
1569	int rc = VINF_SUCCESS;
1570
1571	/* Get I/O interface. */
1572	PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage);
1573	AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
1574
1575	if ( !VALID_PTR(pszFilename)
1576	\|\| !*pszFilename)
1577	{
1578	rc = VERR_INVALID_PARAMETER;
1579	goto out;
1580	}
1581
1582	/*
1583	* Open the file and read the footer.
1584	*/
1585	rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
1586	VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY,
1587	false /* fCreate */),
1588	&pStorage);
1589	if (RT_SUCCESS(rc))
1590	rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
1591
1592	if ( RT_SUCCESS(rc)
1593	&& cbFile > sizeof(QedHeader))
1594	{
1595	QedHeader Header;
1596
1597	rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &Header, sizeof(Header), NULL);
1598	if ( RT_SUCCESS(rc)
1599	&& qedHdrConvertToHostEndianess(&Header))
1600	{
1601	*penmType = VDTYPE_HDD;
1602	rc = VINF_SUCCESS;
1603	}
1604	else
1605	rc = VERR_VD_GEN_INVALID_HEADER;
1606	}
1607	else
1608	rc = VERR_VD_GEN_INVALID_HEADER;
1609
1610	if (pStorage)
1611	vdIfIoIntFileClose(pIfIo, pStorage);
1612
1613	out:
1614	LogFlowFunc(("returns %Rrc\n", rc));
1615	return rc;
1616	}
1617
1618	/** @copydoc VBOXHDDBACKEND::pfnOpen */
1619	static int qedOpen(const char *pszFilename, unsigned uOpenFlags,
1620	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1621	VDTYPE enmType, void **ppBackendData)
1622	{
1623	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
1624	int rc;
1625	PQEDIMAGE pImage;
1626
1627	/* Check open flags. All valid flags are supported. */
1628	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1629	{
1630	rc = VERR_INVALID_PARAMETER;
1631	goto out;
1632	}
1633
1634	/* Check remaining arguments. */
1635	if ( !VALID_PTR(pszFilename)
1636	\|\| !*pszFilename)
1637	{
1638	rc = VERR_INVALID_PARAMETER;
1639	goto out;
1640	}
1641
1642
1643	pImage = (PQEDIMAGE)RTMemAllocZ(sizeof(QEDIMAGE));
1644	if (!pImage)
1645	{
1646	rc = VERR_NO_MEMORY;
1647	goto out;
1648	}
1649	pImage->pszFilename = pszFilename;
1650	pImage->pStorage = NULL;
1651	pImage->pVDIfsDisk = pVDIfsDisk;
1652	pImage->pVDIfsImage = pVDIfsImage;
1653
1654	rc = qedOpenImage(pImage, uOpenFlags);
1655	if (RT_SUCCESS(rc))
1656	*ppBackendData = pImage;
1657	else
1658	RTMemFree(pImage);
1659
1660	out:
1661	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1662	return rc;
1663	}
1664
1665	/** @copydoc VBOXHDDBACKEND::pfnCreate */
1666	static int qedCreate(const char *pszFilename, uint64_t cbSize,
1667	unsigned uImageFlags, const char *pszComment,
1668	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1669	PCRTUUID pUuid, unsigned uOpenFlags,
1670	unsigned uPercentStart, unsigned uPercentSpan,
1671	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1672	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
1673	{
1674	LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p ppBackendData=%#p",
1675	pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
1676	int rc;
1677	PQEDIMAGE pImage;
1678
1679	PFNVDPROGRESS pfnProgress = NULL;
1680	void *pvUser = NULL;
1681	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
1682	if (pIfProgress)
1683	{
1684	pfnProgress = pIfProgress->pfnProgress;
1685	pvUser = pIfProgress->Core.pvUser;
1686	}
1687
1688	/* Check open flags. All valid flags are supported. */
1689	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
1690	{
1691	rc = VERR_INVALID_PARAMETER;
1692	goto out;
1693	}
1694
1695	/* Check remaining arguments. */
1696	if ( !VALID_PTR(pszFilename)
1697	\|\| !*pszFilename
1698	\|\| !VALID_PTR(pPCHSGeometry)
1699	\|\| !VALID_PTR(pLCHSGeometry))
1700	{
1701	rc = VERR_INVALID_PARAMETER;
1702	goto out;
1703	}
1704
1705	pImage = (PQEDIMAGE)RTMemAllocZ(sizeof(QEDIMAGE));
1706	if (!pImage)
1707	{
1708	rc = VERR_NO_MEMORY;
1709	goto out;
1710	}
1711	pImage->pszFilename = pszFilename;
1712	pImage->pStorage = NULL;
1713	pImage->pVDIfsDisk = pVDIfsDisk;
1714	pImage->pVDIfsImage = pVDIfsImage;
1715
1716	rc = qedCreateImage(pImage, cbSize, uImageFlags, pszComment,
1717	pPCHSGeometry, pLCHSGeometry, uOpenFlags,
1718	pfnProgress, pvUser, uPercentStart, uPercentSpan);
1719	if (RT_SUCCESS(rc))
1720	{
1721	/* So far the image is opened in read/write mode. Make sure the
1722	* image is opened in read-only mode if the caller requested that. */
1723	if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1724	{
1725	qedFreeImage(pImage, false);
1726	rc = qedOpenImage(pImage, uOpenFlags);
1727	if (RT_FAILURE(rc))
1728	{
1729	RTMemFree(pImage);
1730	goto out;
1731	}
1732	}
1733	*ppBackendData = pImage;
1734	}
1735	else
1736	RTMemFree(pImage);
1737
1738	out:
1739	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1740	return rc;
1741	}
1742
1743	/** @copydoc VBOXHDDBACKEND::pfnRename */
1744	static int qedRename(void pBackendData, const char pszFilename)
1745	{
1746	LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1747	int rc = VINF_SUCCESS;
1748	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
1749
1750	/* Check arguments. */
1751	if ( !pImage
1752	\|\| !pszFilename
1753	\|\| !*pszFilename)
1754	{
1755	rc = VERR_INVALID_PARAMETER;
1756	goto out;
1757	}
1758
1759	/* Close the image. */
1760	rc = qedFreeImage(pImage, false);
1761	if (RT_FAILURE(rc))
1762	goto out;
1763
1764	/* Rename the file. */
1765	rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
1766	if (RT_FAILURE(rc))
1767	{
1768	/* The move failed, try to reopen the original image. */
1769	int rc2 = qedOpenImage(pImage, pImage->uOpenFlags);
1770	if (RT_FAILURE(rc2))
1771	rc = rc2;
1772
1773	goto out;
1774	}
1775
1776	/* Update pImage with the new information. */
1777	pImage->pszFilename = pszFilename;
1778
1779	/* Open the old image with new name. */
1780	rc = qedOpenImage(pImage, pImage->uOpenFlags);
1781	if (RT_FAILURE(rc))
1782	goto out;
1783
1784	out:
1785	LogFlowFunc(("returns %Rrc\n", rc));
1786	return rc;
1787	}
1788
1789	/** @copydoc VBOXHDDBACKEND::pfnClose */
1790	static int qedClose(void *pBackendData, bool fDelete)
1791	{
1792	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1793	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
1794	int rc;
1795
1796	rc = qedFreeImage(pImage, fDelete);
1797	RTMemFree(pImage);
1798
1799	LogFlowFunc(("returns %Rrc\n", rc));
1800	return rc;
1801	}
1802
1803	/** @copydoc VBOXHDDBACKEND::pfnRead */
1804	static int qedRead(void pBackendData, uint64_t uOffset, void pvBuf,
1805	size_t cbToRead, size_t *pcbActuallyRead)
1806	{
1807	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
1808	pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
1809	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
1810	uint32_t offCluster = 0;
1811	uint32_t idxL1 = 0;
1812	uint32_t idxL2 = 0;
1813	uint64_t offFile = 0;
1814	int rc;
1815
1816	AssertPtr(pImage);
1817	Assert(uOffset % 512 == 0);
1818	Assert(cbToRead % 512 == 0);
1819
1820	if ( uOffset + cbToRead > pImage->cbSize
1821	\|\| cbToRead == 0)
1822	{
1823	rc = VERR_INVALID_PARAMETER;
1824	goto out;
1825	}
1826
1827	qedConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
1828	LogFlowFunc(("idxL1=%u idxL2=%u offCluster=%u\n", idxL1, idxL2, offCluster));
1829
1830	/* Clip read size to remain in the cluster. */
1831	cbToRead = RT_MIN(cbToRead, pImage->cbCluster - offCluster);
1832
1833	/* Get offset in image. */
1834	rc = qedConvertToImageOffset(pImage, idxL1, idxL2, offCluster, &offFile);
1835	if (RT_SUCCESS(rc))
1836	{
1837	LogFlowFunc(("offFile=%llu\n", offFile));
1838	rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, offFile,
1839	pvBuf, cbToRead, NULL);
1840	}
1841
1842	if ( (RT_SUCCESS(rc) \|\| rc == VERR_VD_BLOCK_FREE)
1843	&& pcbActuallyRead)
1844	*pcbActuallyRead = cbToRead;
1845
1846	out:
1847	LogFlowFunc(("returns %Rrc\n", rc));
1848	return rc;
1849	}
1850
1851	/** @copydoc VBOXHDDBACKEND::pfnWrite */
1852	static int qedWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
1853	size_t cbToWrite, size_t *pcbWriteProcess,
1854	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
1855	{
1856	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
1857	pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1858	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
1859	uint32_t offCluster = 0;
1860	uint32_t idxL1 = 0;
1861	uint32_t idxL2 = 0;
1862	uint64_t offImage = 0;
1863	int rc;
1864
1865	AssertPtr(pImage);
1866	Assert(uOffset % 512 == 0);
1867	Assert(cbToWrite % 512 == 0);
1868
1869	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
1870	{
1871	rc = VERR_VD_IMAGE_READ_ONLY;
1872	goto out;
1873	}
1874
1875	if ( uOffset + cbToWrite > pImage->cbSize
1876	\|\| cbToWrite == 0)
1877	{
1878	rc = VERR_INVALID_PARAMETER;
1879	goto out;
1880	}
1881
1882	/* Convert offset to L1, L2 index and cluster offset. */
1883	qedConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
1884
1885	/* Clip write size to remain in the cluster. */
1886	cbToWrite = RT_MIN(cbToWrite, pImage->cbCluster - offCluster);
1887	Assert(!(cbToWrite % 512));
1888
1889	/* Get offset in image. */
1890	rc = qedConvertToImageOffset(pImage, idxL1, idxL2, offCluster, &offImage);
1891	if (RT_SUCCESS(rc))
1892	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, offImage,
1893	pvBuf, cbToWrite, NULL);
1894	else if (rc == VERR_VD_BLOCK_FREE)
1895	{
1896	if ( cbToWrite == pImage->cbCluster
1897	&& !(fWrite & VD_WRITE_NO_ALLOC))
1898	{
1899	PQEDL2CACHEENTRY pL2Entry = NULL;
1900
1901	/* Full cluster write to previously unallocated cluster.
1902	* Allocate cluster and write data. */
1903	Assert(!offCluster);
1904
1905	do
1906	{
1907	uint64_t idxUpdateLe = 0;
1908
1909	/* Check if we have to allocate a new cluster for L2 tables. */
1910	if (!pImage->paL1Table[idxL1])
1911	{
1912	uint64_t offL2Tbl = qedClusterAllocate(pImage, qedByte2Cluster(pImage, pImage->cbTable));
1913
1914	pL2Entry = qedL2TblCacheEntryAlloc(pImage);
1915	if (!pL2Entry)
1916	{
1917	rc = VERR_NO_MEMORY;
1918	break;
1919	}
1920
1921	pL2Entry->offL2Tbl = offL2Tbl;
1922	memset(pL2Entry->paL2Tbl, 0, pImage->cbTable);
1923	qedL2TblCacheEntryInsert(pImage, pL2Entry);
1924
1925	/*
1926	* Write the L2 table first and link to the L1 table afterwards.
1927	* If something unexpected happens the worst case which can happen
1928	* is a leak of some clusters.
1929	*/
1930	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, offL2Tbl,
1931	pL2Entry->paL2Tbl, pImage->cbTable, NULL);
1932	if (RT_FAILURE(rc))
1933	break;
1934
1935	/* Write the L1 link now. */
1936	pImage->paL1Table[idxL1] = offL2Tbl;
1937	idxUpdateLe = RT_H2LE_U64(offL2Tbl);
1938	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
1939	pImage->offL1Table + idxL1*sizeof(uint64_t),
1940	&idxUpdateLe, sizeof(uint64_t), NULL);
1941	if (RT_FAILURE(rc))
1942	break;
1943	}
1944	else
1945	rc = qedL2TblCacheFetch(pImage, pImage->paL1Table[idxL1], &pL2Entry);
1946
1947	if (RT_SUCCESS(rc))
1948	{
1949	/* Allocate new cluster for the data. */
1950	uint64_t offData = qedClusterAllocate(pImage, 1);
1951
1952	/* Write data. */
1953	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
1954	offData, pvBuf, cbToWrite, NULL);
1955	if (RT_FAILURE(rc))
1956	break;
1957
1958	/* Link L2 table and update it. */
1959	pL2Entry->paL2Tbl[idxL2] = offData;
1960	idxUpdateLe = RT_H2LE_U64(offData);
1961	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
1962	pImage->paL1Table[idxL1] + idxL2*sizeof(uint64_t),
1963	&idxUpdateLe, sizeof(uint64_t), NULL);
1964	qedL2TblCacheEntryRelease(pL2Entry);
1965	}
1966
1967	} while (0);
1968
1969	*pcbPreRead = 0;
1970	*pcbPostRead = 0;
1971	}
1972	else
1973	{
1974	/* Trying to do a partial write to an unallocated cluster. Don't do
1975	* anything except letting the upper layer know what to do. */
1976	*pcbPreRead = offCluster;
1977	pcbPostRead = pImage->cbCluster - cbToWrite - pcbPreRead;
1978	}
1979	}
1980
1981	if (pcbWriteProcess)
1982	*pcbWriteProcess = cbToWrite;
1983
1984	out:
1985	LogFlowFunc(("returns %Rrc\n", rc));
1986	return rc;
1987	}
1988
1989	/** @copydoc VBOXHDDBACKEND::pfnFlush */
1990	static int qedFlush(void *pBackendData)
1991	{
1992	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1993	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
1994	int rc;
1995
1996	rc = qedFlushImage(pImage);
1997	LogFlowFunc(("returns %Rrc\n", rc));
1998	return rc;
1999	}
2000
2001	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
2002	static unsigned qedGetVersion(void *pBackendData)
2003	{
2004	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2005	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2006
2007	AssertPtr(pImage);
2008
2009	if (pImage)
2010	return 1;
2011	else
2012	return 0;
2013	}
2014
2015	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
2016	static uint64_t qedGetSize(void *pBackendData)
2017	{
2018	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2019	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2020	uint64_t cb = 0;
2021
2022	AssertPtr(pImage);
2023
2024	if (pImage && pImage->pStorage)
2025	cb = pImage->cbSize;
2026
2027	LogFlowFunc(("returns %llu\n", cb));
2028	return cb;
2029	}
2030
2031	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
2032	static uint64_t qedGetFileSize(void *pBackendData)
2033	{
2034	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2035	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2036	uint64_t cb = 0;
2037
2038	AssertPtr(pImage);
2039
2040	if (pImage)
2041	{
2042	uint64_t cbFile;
2043	if (pImage->pStorage)
2044	{
2045	int rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
2046	if (RT_SUCCESS(rc))
2047	cb += cbFile;
2048	}
2049	}
2050
2051	LogFlowFunc(("returns %lld\n", cb));
2052	return cb;
2053	}
2054
2055	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
2056	static int qedGetPCHSGeometry(void *pBackendData,
2057	PVDGEOMETRY pPCHSGeometry)
2058	{
2059	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
2060	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2061	int rc;
2062
2063	AssertPtr(pImage);
2064
2065	if (pImage)
2066	{
2067	if (pImage->PCHSGeometry.cCylinders)
2068	{
2069	*pPCHSGeometry = pImage->PCHSGeometry;
2070	rc = VINF_SUCCESS;
2071	}
2072	else
2073	rc = VERR_VD_GEOMETRY_NOT_SET;
2074	}
2075	else
2076	rc = VERR_VD_NOT_OPENED;
2077
2078	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
2079	return rc;
2080	}
2081
2082	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
2083	static int qedSetPCHSGeometry(void *pBackendData,
2084	PCVDGEOMETRY pPCHSGeometry)
2085	{
2086	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
2087	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2088	int rc;
2089
2090	AssertPtr(pImage);
2091
2092	if (pImage)
2093	{
2094	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2095	{
2096	rc = VERR_VD_IMAGE_READ_ONLY;
2097	goto out;
2098	}
2099
2100	pImage->PCHSGeometry = *pPCHSGeometry;
2101	rc = VINF_SUCCESS;
2102	}
2103	else
2104	rc = VERR_VD_NOT_OPENED;
2105
2106	out:
2107	LogFlowFunc(("returns %Rrc\n", rc));
2108	return rc;
2109	}
2110
2111	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
2112	static int qedGetLCHSGeometry(void *pBackendData,
2113	PVDGEOMETRY pLCHSGeometry)
2114	{
2115	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
2116	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2117	int rc;
2118
2119	AssertPtr(pImage);
2120
2121	if (pImage)
2122	{
2123	if (pImage->LCHSGeometry.cCylinders)
2124	{
2125	*pLCHSGeometry = pImage->LCHSGeometry;
2126	rc = VINF_SUCCESS;
2127	}
2128	else
2129	rc = VERR_VD_GEOMETRY_NOT_SET;
2130	}
2131	else
2132	rc = VERR_VD_NOT_OPENED;
2133
2134	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
2135	return rc;
2136	}
2137
2138	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
2139	static int qedSetLCHSGeometry(void *pBackendData,
2140	PCVDGEOMETRY pLCHSGeometry)
2141	{
2142	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
2143	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2144	int rc;
2145
2146	AssertPtr(pImage);
2147
2148	if (pImage)
2149	{
2150	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2151	{
2152	rc = VERR_VD_IMAGE_READ_ONLY;
2153	goto out;
2154	}
2155
2156	pImage->LCHSGeometry = *pLCHSGeometry;
2157	rc = VINF_SUCCESS;
2158	}
2159	else
2160	rc = VERR_VD_NOT_OPENED;
2161
2162	out:
2163	LogFlowFunc(("returns %Rrc\n", rc));
2164	return rc;
2165	}
2166
2167	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
2168	static unsigned qedGetImageFlags(void *pBackendData)
2169	{
2170	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2171	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2172	unsigned uImageFlags;
2173
2174	AssertPtr(pImage);
2175
2176	if (pImage)
2177	uImageFlags = pImage->uImageFlags;
2178	else
2179	uImageFlags = 0;
2180
2181	LogFlowFunc(("returns %#x\n", uImageFlags));
2182	return uImageFlags;
2183	}
2184
2185	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
2186	static unsigned qedGetOpenFlags(void *pBackendData)
2187	{
2188	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2189	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2190	unsigned uOpenFlags;
2191
2192	AssertPtr(pImage);
2193
2194	if (pImage)
2195	uOpenFlags = pImage->uOpenFlags;
2196	else
2197	uOpenFlags = 0;
2198
2199	LogFlowFunc(("returns %#x\n", uOpenFlags));
2200	return uOpenFlags;
2201	}
2202
2203	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
2204	static int qedSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
2205	{
2206	LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
2207	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2208	int rc;
2209
2210	/* Image must be opened and the new flags must be valid. */
2211	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO)))
2212	{
2213	rc = VERR_INVALID_PARAMETER;
2214	goto out;
2215	}
2216
2217	/* Implement this operation via reopening the image. */
2218	rc = qedFreeImage(pImage, false);
2219	if (RT_FAILURE(rc))
2220	goto out;
2221	rc = qedOpenImage(pImage, uOpenFlags);
2222
2223	out:
2224	LogFlowFunc(("returns %Rrc\n", rc));
2225	return rc;
2226	}
2227
2228	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
2229	static int qedGetComment(void pBackendData, char pszComment,
2230	size_t cbComment)
2231	{
2232	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
2233	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2234	int rc;
2235
2236	AssertPtr(pImage);
2237
2238	if (pImage)
2239	rc = VERR_NOT_SUPPORTED;
2240	else
2241	rc = VERR_VD_NOT_OPENED;
2242
2243	LogFlowFunc(("returns %Rrc comment='%s'\n", rc, pszComment));
2244	return rc;
2245	}
2246
2247	/** @copydoc VBOXHDDBACKEND::pfnSetComment */
2248	static int qedSetComment(void pBackendData, const char pszComment)
2249	{
2250	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
2251	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2252	int rc;
2253
2254	AssertPtr(pImage);
2255
2256	if (pImage)
2257	{
2258	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2259	rc = VERR_VD_IMAGE_READ_ONLY;
2260	else
2261	rc = VERR_NOT_SUPPORTED;
2262	}
2263	else
2264	rc = VERR_VD_NOT_OPENED;
2265
2266	LogFlowFunc(("returns %Rrc\n", rc));
2267	return rc;
2268	}
2269
2270	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
2271	static int qedGetUuid(void *pBackendData, PRTUUID pUuid)
2272	{
2273	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2274	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2275	int rc;
2276
2277	AssertPtr(pImage);
2278
2279	if (pImage)
2280	rc = VERR_NOT_SUPPORTED;
2281	else
2282	rc = VERR_VD_NOT_OPENED;
2283
2284	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2285	return rc;
2286	}
2287
2288	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
2289	static int qedSetUuid(void *pBackendData, PCRTUUID pUuid)
2290	{
2291	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2292	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2293	int rc;
2294
2295	LogFlowFunc(("%RTuuid\n", pUuid));
2296	AssertPtr(pImage);
2297
2298	if (pImage)
2299	{
2300	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2301	rc = VERR_NOT_SUPPORTED;
2302	else
2303	rc = VERR_VD_IMAGE_READ_ONLY;
2304	}
2305	else
2306	rc = VERR_VD_NOT_OPENED;
2307
2308	LogFlowFunc(("returns %Rrc\n", rc));
2309	return rc;
2310	}
2311
2312	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
2313	static int qedGetModificationUuid(void *pBackendData, PRTUUID pUuid)
2314	{
2315	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2316	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2317	int rc;
2318
2319	AssertPtr(pImage);
2320
2321	if (pImage)
2322	rc = VERR_NOT_SUPPORTED;
2323	else
2324	rc = VERR_VD_NOT_OPENED;
2325
2326	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2327	return rc;
2328	}
2329
2330	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
2331	static int qedSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
2332	{
2333	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2334	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2335	int rc;
2336
2337	AssertPtr(pImage);
2338
2339	if (pImage)
2340	{
2341	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2342	rc = VERR_NOT_SUPPORTED;
2343	else
2344	rc = VERR_VD_IMAGE_READ_ONLY;
2345	}
2346	else
2347	rc = VERR_VD_NOT_OPENED;
2348
2349	LogFlowFunc(("returns %Rrc\n", rc));
2350	return rc;
2351	}
2352
2353	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
2354	static int qedGetParentUuid(void *pBackendData, PRTUUID pUuid)
2355	{
2356	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2357	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2358	int rc;
2359
2360	AssertPtr(pImage);
2361
2362	if (pImage)
2363	rc = VERR_NOT_SUPPORTED;
2364	else
2365	rc = VERR_VD_NOT_OPENED;
2366
2367	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2368	return rc;
2369	}
2370
2371	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
2372	static int qedSetParentUuid(void *pBackendData, PCRTUUID pUuid)
2373	{
2374	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2375	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2376	int rc;
2377
2378	AssertPtr(pImage);
2379
2380	if (pImage)
2381	{
2382	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2383	rc = VERR_NOT_SUPPORTED;
2384	else
2385	rc = VERR_VD_IMAGE_READ_ONLY;
2386	}
2387	else
2388	rc = VERR_VD_NOT_OPENED;
2389
2390	LogFlowFunc(("returns %Rrc\n", rc));
2391	return rc;
2392	}
2393
2394	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
2395	static int qedGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
2396	{
2397	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2398	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2399	int rc;
2400
2401	AssertPtr(pImage);
2402
2403	if (pImage)
2404	rc = VERR_NOT_SUPPORTED;
2405	else
2406	rc = VERR_VD_NOT_OPENED;
2407
2408	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
2409	return rc;
2410	}
2411
2412	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
2413	static int qedSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
2414	{
2415	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2416	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2417	int rc;
2418
2419	AssertPtr(pImage);
2420
2421	if (pImage)
2422	{
2423	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
2424	rc = VERR_NOT_SUPPORTED;
2425	else
2426	rc = VERR_VD_IMAGE_READ_ONLY;
2427	}
2428	else
2429	rc = VERR_VD_NOT_OPENED;
2430
2431	LogFlowFunc(("returns %Rrc\n", rc));
2432	return rc;
2433	}
2434
2435	/** @copydoc VBOXHDDBACKEND::pfnDump */
2436	static void qedDump(void *pBackendData)
2437	{
2438	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2439
2440	AssertPtr(pImage);
2441	if (pImage)
2442	{
2443	vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%llu\n",
2444	pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors,
2445	pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors,
2446	pImage->cbSize / 512);
2447	}
2448	}
2449
2450	/** @copydoc VBOXHDDBACKEND::pfnGetParentFilename */
2451	static int qedGetParentFilename(void pBackendData, char *ppszParentFilename)
2452	{
2453	int rc = VINF_SUCCESS;
2454	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2455
2456	AssertPtr(pImage);
2457	if (pImage)
2458	if (pImage->pszFilename)
2459	*ppszParentFilename = RTStrDup(pImage->pszBackingFilename);
2460	else
2461	rc = VERR_NOT_SUPPORTED;
2462	else
2463	rc = VERR_VD_NOT_OPENED;
2464
2465	LogFlowFunc(("returns %Rrc\n", rc));
2466	return rc;
2467	}
2468
2469	/** @copydoc VBOXHDDBACKEND::pfnSetParentFilename */
2470	static int qedSetParentFilename(void pBackendData, const char pszParentFilename)
2471	{
2472	int rc = VINF_SUCCESS;
2473	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2474
2475	AssertPtr(pImage);
2476	if (pImage)
2477	{
2478	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2479	rc = VERR_VD_IMAGE_READ_ONLY;
2480	else if ( pImage->pszBackingFilename
2481	&& (strlen(pszParentFilename) > pImage->cbBackingFilename))
2482	rc = VERR_NOT_SUPPORTED; /* The new filename is longer than the old one. */
2483	else
2484	{
2485	if (pImage->pszBackingFilename)
2486	RTStrFree(pImage->pszBackingFilename);
2487	pImage->pszBackingFilename = RTStrDup(pszParentFilename);
2488	if (!pImage->pszBackingFilename)
2489	rc = VERR_NO_MEMORY;
2490	else
2491	{
2492	if (!pImage->offBackingFilename)
2493	{
2494	/* Allocate new cluster. */
2495	uint64_t offData = qedClusterAllocate(pImage, 1);
2496
2497	Assert((offData & UINT32_MAX) == offData);
2498	pImage->offBackingFilename = (uint32_t)offData;
2499	pImage->cbBackingFilename = strlen(pszParentFilename);
2500	rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
2501	offData + pImage->cbCluster);
2502	}
2503
2504	if (RT_SUCCESS(rc))
2505	rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2506	pImage->offBackingFilename,
2507	pImage->pszBackingFilename,
2508	strlen(pImage->pszBackingFilename),
2509	NULL);
2510	}
2511	}
2512	}
2513	else
2514	rc = VERR_VD_NOT_OPENED;
2515
2516	LogFlowFunc(("returns %Rrc\n", rc));
2517	return rc;
2518	}
2519
2520	static int qedAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
2521	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
2522	{
2523	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
2524	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
2525	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2526	uint32_t offCluster = 0;
2527	uint32_t idxL1 = 0;
2528	uint32_t idxL2 = 0;
2529	uint64_t offFile = 0;
2530	int rc;
2531
2532	AssertPtr(pImage);
2533	Assert(uOffset % 512 == 0);
2534	Assert(cbToRead % 512 == 0);
2535
2536	if (!VALID_PTR(pIoCtx) \|\| !cbToRead)
2537	{
2538	rc = VERR_INVALID_PARAMETER;
2539	goto out;
2540	}
2541
2542	if ( uOffset + cbToRead > pImage->cbSize
2543	\|\| cbToRead == 0)
2544	{
2545	rc = VERR_INVALID_PARAMETER;
2546	goto out;
2547	}
2548
2549	qedConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
2550
2551	/* Clip read size to remain in the cluster. */
2552	cbToRead = RT_MIN(cbToRead, pImage->cbCluster - offCluster);
2553
2554	/* Get offset in image. */
2555	rc = qedConvertToImageOffsetAsync(pImage, pIoCtx, idxL1, idxL2, offCluster,
2556	&offFile);
2557	if (RT_SUCCESS(rc))
2558	rc = vdIfIoIntFileReadUserAsync(pImage->pIfIo, pImage->pStorage, offFile,
2559	pIoCtx, cbToRead);
2560
2561	if ( ( RT_SUCCESS(rc)
2562	\|\| rc == VERR_VD_BLOCK_FREE
2563	\|\| rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
2564	&& pcbActuallyRead)
2565	*pcbActuallyRead = cbToRead;
2566
2567	out:
2568	LogFlowFunc(("returns %Rrc\n", rc));
2569	return rc;
2570	}
2571
2572	static int qedAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
2573	PVDIOCTX pIoCtx,
2574	size_t pcbWriteProcess, size_t pcbPreRead,
2575	size_t *pcbPostRead, unsigned fWrite)
2576	{
2577	LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
2578	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
2579	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2580	uint32_t offCluster = 0;
2581	uint32_t idxL1 = 0;
2582	uint32_t idxL2 = 0;
2583	uint64_t offImage = 0;
2584	int rc = VINF_SUCCESS;
2585
2586	AssertPtr(pImage);
2587	Assert(!(uOffset % 512));
2588	Assert(!(cbToWrite % 512));
2589
2590	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2591	{
2592	rc = VERR_VD_IMAGE_READ_ONLY;
2593	goto out;
2594	}
2595
2596	if (!VALID_PTR(pIoCtx) \|\| !cbToWrite)
2597	{
2598	rc = VERR_INVALID_PARAMETER;
2599	goto out;
2600	}
2601
2602	if ( uOffset + cbToWrite > pImage->cbSize
2603	\|\| cbToWrite == 0)
2604	{
2605	rc = VERR_INVALID_PARAMETER;
2606	goto out;
2607	}
2608
2609	/* Convert offset to L1, L2 index and cluster offset. */
2610	qedConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
2611
2612	/* Clip write size to remain in the cluster. */
2613	cbToWrite = RT_MIN(cbToWrite, pImage->cbCluster - offCluster);
2614	Assert(!(cbToWrite % 512));
2615
2616	/* Get offset in image. */
2617	rc = qedConvertToImageOffsetAsync(pImage, pIoCtx, idxL1, idxL2, offCluster,
2618	&offImage);
2619	if (RT_SUCCESS(rc))
2620	rc = vdIfIoIntFileWriteUserAsync(pImage->pIfIo, pImage->pStorage,
2621	offImage, pIoCtx, cbToWrite, NULL, NULL);
2622	else if (rc == VERR_VD_BLOCK_FREE)
2623	{
2624	if ( cbToWrite == pImage->cbCluster
2625	&& !(fWrite & VD_WRITE_NO_ALLOC))
2626	{
2627	PQEDL2CACHEENTRY pL2Entry = NULL;
2628
2629	/* Full cluster write to previously unallocated cluster.
2630	* Allocate cluster and write data. */
2631	Assert(!offCluster);
2632
2633	do
2634	{
2635	uint64_t idxUpdateLe = 0;
2636
2637	/* Check if we have to allocate a new cluster for L2 tables. */
2638	if (!pImage->paL1Table[idxL1])
2639	{
2640	uint64_t offL2Tbl;
2641	PQEDCLUSTERASYNCALLOC pL2ClusterAlloc = NULL;
2642
2643	/* Allocate new async cluster allocation state. */
2644	pL2ClusterAlloc = (PQEDCLUSTERASYNCALLOC)RTMemAllocZ(sizeof(QEDCLUSTERASYNCALLOC));
2645	if (RT_UNLIKELY(!pL2ClusterAlloc))
2646	{
2647	rc = VERR_NO_MEMORY;
2648	break;
2649	}
2650
2651	pL2Entry = qedL2TblCacheEntryAlloc(pImage);
2652	if (!pL2Entry)
2653	{
2654	rc = VERR_NO_MEMORY;
2655	RTMemFree(pL2ClusterAlloc);
2656	break;
2657	}
2658
2659	offL2Tbl = qedClusterAllocate(pImage, qedByte2Cluster(pImage, pImage->cbTable));
2660	pL2Entry->offL2Tbl = offL2Tbl;
2661	memset(pL2Entry->paL2Tbl, 0, pImage->cbTable);
2662
2663	pL2ClusterAlloc->enmAllocState = QEDCLUSTERASYNCALLOCSTATE_L2_ALLOC;
2664	pL2ClusterAlloc->cbImageOld = offL2Tbl;
2665	pL2ClusterAlloc->offClusterNew = offL2Tbl;
2666	pL2ClusterAlloc->idxL1 = idxL1;
2667	pL2ClusterAlloc->idxL2 = idxL2;
2668	pL2ClusterAlloc->cbToWrite = cbToWrite;
2669	pL2ClusterAlloc->pL2Entry = pL2Entry;
2670
2671	/*
2672	* Write the L2 table first and link to the L1 table afterwards.
2673	* If something unexpected happens the worst case which can happen
2674	* is a leak of some clusters.
2675	*/
2676	rc = vdIfIoIntFileWriteMetaAsync(pImage->pIfIo, pImage->pStorage,
2677	offL2Tbl, pL2Entry->paL2Tbl, pImage->cbTable, pIoCtx,
2678	qedAsyncClusterAllocUpdate, pL2ClusterAlloc);
2679	if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
2680	break;
2681	else if (RT_FAILURE(rc))
2682	{
2683	RTMemFree(pL2ClusterAlloc);
2684	qedL2TblCacheEntryFree(pImage, pL2Entry);
2685	break;
2686	}
2687
2688	rc = qedAsyncClusterAllocUpdate(pImage, pIoCtx, pL2ClusterAlloc, rc);
2689	}
2690	else
2691	{
2692	rc = qedL2TblCacheFetchAsync(pImage, pIoCtx, pImage->paL1Table[idxL1],
2693	&pL2Entry);
2694
2695	if (RT_SUCCESS(rc))
2696	{
2697	PQEDCLUSTERASYNCALLOC pDataClusterAlloc = NULL;
2698
2699	/* Allocate new async cluster allocation state. */
2700	pDataClusterAlloc = (PQEDCLUSTERASYNCALLOC)RTMemAllocZ(sizeof(QEDCLUSTERASYNCALLOC));
2701	if (RT_UNLIKELY(!pDataClusterAlloc))
2702	{
2703	rc = VERR_NO_MEMORY;
2704	break;
2705	}
2706
2707	/* Allocate new cluster for the data. */
2708	uint64_t offData = qedClusterAllocate(pImage, 1);
2709
2710	pDataClusterAlloc->enmAllocState = QEDCLUSTERASYNCALLOCSTATE_USER_ALLOC;
2711	pDataClusterAlloc->cbImageOld = offData;
2712	pDataClusterAlloc->offClusterNew = offData;
2713	pDataClusterAlloc->idxL1 = idxL1;
2714	pDataClusterAlloc->idxL2 = idxL2;
2715	pDataClusterAlloc->cbToWrite = cbToWrite;
2716	pDataClusterAlloc->pL2Entry = pL2Entry;
2717
2718	/* Write data. */
2719	rc = vdIfIoIntFileWriteUserAsync(pImage->pIfIo, pImage->pStorage,
2720	offData, pIoCtx, cbToWrite,
2721	qedAsyncClusterAllocUpdate, pDataClusterAlloc);
2722	if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
2723	break;
2724	else if (RT_FAILURE(rc))
2725	{
2726	RTMemFree(pDataClusterAlloc);
2727	break;
2728	}
2729
2730	rc = qedAsyncClusterAllocUpdate(pImage, pIoCtx, pDataClusterAlloc, rc);
2731	}
2732	}
2733
2734	} while (0);
2735
2736	*pcbPreRead = 0;
2737	*pcbPostRead = 0;
2738	}
2739	else
2740	{
2741	/* Trying to do a partial write to an unallocated cluster. Don't do
2742	* anything except letting the upper layer know what to do. */
2743	*pcbPreRead = offCluster;
2744	pcbPostRead = pImage->cbCluster - cbToWrite - pcbPreRead;
2745	}
2746	}
2747
2748	if (pcbWriteProcess)
2749	*pcbWriteProcess = cbToWrite;
2750
2751
2752	out:
2753	LogFlowFunc(("returns %Rrc\n", rc));
2754	return rc;
2755	}
2756
2757	static int qedAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
2758	{
2759	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2760	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2761	int rc = VINF_SUCCESS;
2762
2763	Assert(pImage);
2764
2765	if (VALID_PTR(pIoCtx))
2766	rc = qedFlushImageAsync(pImage, pIoCtx);
2767	else
2768	rc = VERR_INVALID_PARAMETER;
2769
2770	LogFlowFunc(("returns %Rrc\n", rc));
2771	return rc;
2772	}
2773
2774	/** @copydoc VBOXHDDBACKEND::pfnResize */
2775	static int qedResize(void *pBackendData, uint64_t cbSize,
2776	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
2777	unsigned uPercentStart, unsigned uPercentSpan,
2778	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
2779	PVDINTERFACE pVDIfsOperation)
2780	{
2781	PQEDIMAGE pImage = (PQEDIMAGE)pBackendData;
2782	int rc = VINF_SUCCESS;
2783
2784	PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
2785
2786	/* Making the image smaller is not supported at the moment. */
2787	if (cbSize < pImage->cbSize)
2788	rc = VERR_NOT_SUPPORTED;
2789	else if (cbSize > pImage->cbSize)
2790	{
2791	/*
2792	* It is enough to just update the size field in the header to complete
2793	* growing. With the default cluster and table sizes the image can be expanded
2794	* to 64TB without overflowing the L1 and L2 tables making block relocation
2795	* superfluous.
2796	* @todo: The rare case where block relocation is still required (non default
2797	* table and/or cluster size or images with more than 64TB) is not
2798	* implemented yet and resizing such an image will fail with an error.
2799	*/
2800	if (qedByte2Cluster(pImage, pImage->cbTable)pImage->cTableEntriespImage->cTableEntries*pImage->cbCluster < cbSize)
2801	rc = vdIfError(pImage->pIfError, VERR_BUFFER_OVERFLOW, RT_SRC_POS,
2802	N_("Qed: Resizing the image '%s' is not supported because it would overflow the L1 and L2 table\n"),
2803	pImage->pszFilename);
2804	else
2805	{
2806	uint64_t cbSizeOld = pImage->cbSize;
2807
2808	pImage->cbSize = cbSize;
2809	rc = qedFlushImage(pImage);
2810	if (RT_FAILURE(rc))
2811	{
2812	pImage->cbSize = cbSizeOld; /* Restore */
2813
2814	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("Qed: Resizing the image '%s' failed\n"),
2815	pImage->pszFilename);
2816	}
2817	}
2818	}
2819	/* Same size doesn't change the image at all. */
2820
2821	LogFlowFunc(("returns %Rrc\n", rc));
2822	return rc;
2823	}
2824
2825
2826	VBOXHDDBACKEND g_QedBackend =
2827	{
2828	/* pszBackendName */
2829	"QED",
2830	/* cbSize */
2831	sizeof(VBOXHDDBACKEND),
2832	/* uBackendCaps */
2833	VD_CAP_FILE \| VD_CAP_VFS \| VD_CAP_CREATE_DYNAMIC \| VD_CAP_DIFF \| VD_CAP_ASYNC,
2834	/* paFileExtensions */
2835	s_aQedFileExtensions,
2836	/* paConfigInfo */
2837	NULL,
2838	/* hPlugin */
2839	NIL_RTLDRMOD,
2840	/* pfnCheckIfValid */
2841	qedCheckIfValid,
2842	/* pfnOpen */
2843	qedOpen,
2844	/* pfnCreate */
2845	qedCreate,
2846	/* pfnRename */
2847	qedRename,
2848	/* pfnClose */
2849	qedClose,
2850	/* pfnRead */
2851	qedRead,
2852	/* pfnWrite */
2853	qedWrite,
2854	/* pfnFlush */
2855	qedFlush,
2856	/* pfnGetVersion */
2857	qedGetVersion,
2858	/* pfnGetSize */
2859	qedGetSize,
2860	/* pfnGetFileSize */
2861	qedGetFileSize,
2862	/* pfnGetPCHSGeometry */
2863	qedGetPCHSGeometry,
2864	/* pfnSetPCHSGeometry */
2865	qedSetPCHSGeometry,
2866	/* pfnGetLCHSGeometry */
2867	qedGetLCHSGeometry,
2868	/* pfnSetLCHSGeometry */
2869	qedSetLCHSGeometry,
2870	/* pfnGetImageFlags */
2871	qedGetImageFlags,
2872	/* pfnGetOpenFlags */
2873	qedGetOpenFlags,
2874	/* pfnSetOpenFlags */
2875	qedSetOpenFlags,
2876	/* pfnGetComment */
2877	qedGetComment,
2878	/* pfnSetComment */
2879	qedSetComment,
2880	/* pfnGetUuid */
2881	qedGetUuid,
2882	/* pfnSetUuid */
2883	qedSetUuid,
2884	/* pfnGetModificationUuid */
2885	qedGetModificationUuid,
2886	/* pfnSetModificationUuid */
2887	qedSetModificationUuid,
2888	/* pfnGetParentUuid */
2889	qedGetParentUuid,
2890	/* pfnSetParentUuid */
2891	qedSetParentUuid,
2892	/* pfnGetParentModificationUuid */
2893	qedGetParentModificationUuid,
2894	/* pfnSetParentModificationUuid */
2895	qedSetParentModificationUuid,
2896	/* pfnDump */
2897	qedDump,
2898	/* pfnGetTimeStamp */
2899	NULL,
2900	/* pfnGetParentTimeStamp */
2901	NULL,
2902	/* pfnSetParentTimeStamp */
2903	NULL,
2904	/* pfnGetParentFilename */
2905	qedGetParentFilename,
2906	/* pfnSetParentFilename */
2907	qedSetParentFilename,
2908	/* pfnAsyncRead */
2909	qedAsyncRead,
2910	/* pfnAsyncWrite */
2911	qedAsyncWrite,
2912	/* pfnAsyncFlush */
2913	qedAsyncFlush,
2914	/* pfnComposeLocation */
2915	genericFileComposeLocation,
2916	/* pfnComposeName */
2917	genericFileComposeName,
2918	/* pfnCompact */
2919	NULL,
2920	/* pfnResize */
2921	qedResize,
2922	/* pfnDiscard */
2923	NULL,
2924	/* pfnAsyncDiscard */
2925	NULL,
2926	/* pfnRepair */
2927	NULL
2928	};

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source: vbox/trunk/src/VBox/Storage/QED.cpp@ 42640

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