VirtualBox

source: vbox/trunk/src/VBox/Storage/QCOW.cpp@ 66472

Last change on this file since 66472 was 66110, checked in by vboxsync, 8 years ago

Storage/VD: Implement infrastructure for region lists to be able to support CD/DVD image formats which can contain multiple tracks in the future
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1/* $Id: QCOW.cpp 66110 2017-03-15 12:18:31Z vboxsync $ */
2/** @file
3 * QCOW - QCOW Disk image.
4 */
5
6/*
7 * Copyright (C) 2011-2016 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/*********************************************************************************************************************************
20* Header Files *
21*********************************************************************************************************************************/
22#define LOG_GROUP LOG_GROUP_VD_QCOW
23#include <VBox/vd-plugin.h>
24#include <VBox/err.h>
25
26#include <VBox/log.h>
27#include <iprt/asm.h>
28#include <iprt/assert.h>
29#include <iprt/string.h>
30#include <iprt/alloc.h>
31#include <iprt/path.h>
32#include <iprt/list.h>
33
34#include "VDBackends.h"
35
36/** @page pg_storage_qcow QCOW Storage Backend
37 * The QCOW backend implements support for the qemu copy on write format (short QCOW).
38 * There is no official specification available but the format is described
39 * at http://people.gnome.org/~markmc/qcow-image-format.html for version 2
40 * and http://people.gnome.org/~markmc/qcow-image-format-version-1.html for version 1.
41 *
42 * Missing things to implement:
43 * - v2 image creation and handling of the reference count table. (Blocker to enable support for V2 images)
44 * - cluster encryption
45 * - cluster compression
46 * - compaction
47 * - resizing
48 */
49
50
51/*********************************************************************************************************************************
52* Structures in a QCOW image, big endian *
53*********************************************************************************************************************************/
54
55#pragma pack(1) /* Completely unnecessary. */
56typedef struct QCowHeader
57{
58 /** Magic value. */
59 uint32_t u32Magic;
60 /** Version of the image. */
61 uint32_t u32Version;
62 /** Version dependent data. */
63 union
64 {
65 /** Version 1. */
66 struct
67 {
68 /** Backing file offset. */
69 uint64_t u64BackingFileOffset;
70 /** Size of the backing file. */
71 uint32_t u32BackingFileSize;
72 /** mtime (Modification time?) - can be ignored. */
73 uint32_t u32MTime;
74 /** Logical size of the image in bytes. */
75 uint64_t u64Size;
76 /** Number of bits in the virtual offset used as a cluster offset. */
77 uint8_t u8ClusterBits;
78 /** Number of bits in the virtual offset used for the L2 index. */
79 uint8_t u8L2Bits;
80 /** Padding because the header is not packed in the original source. */
81 uint16_t u16Padding;
82 /** Used cryptographic method. */
83 uint32_t u32CryptMethod;
84 /** Offset of the L1 table in the image in bytes. */
85 uint64_t u64L1TableOffset;
86 } v1;
87 /** Version 2. */
88 struct
89 {
90 /** Backing file offset. */
91 uint64_t u64BackingFileOffset;
92 /** Size of the backing file. */
93 uint32_t u32BackingFileSize;
94 /** Number of bits in the virtual offset used as a cluster offset. */
95 uint32_t u32ClusterBits;
96 /** Logical size of the image. */
97 uint64_t u64Size;
98 /** Used cryptographic method. */
99 uint32_t u32CryptMethod;
100 /** Size of the L1 table in entries (each 8bytes big). */
101 uint32_t u32L1Size;
102 /** Offset of the L1 table in the image in bytes. */
103 uint64_t u64L1TableOffset;
104 /** Start of the refcount table in the image. */
105 uint64_t u64RefcountTableOffset;
106 /** Size of the refcount table in clusters. */
107 uint32_t u32RefcountTableClusters;
108 /** Number of snapshots in the image. */
109 uint32_t u32NbSnapshots;
110 /** Offset of the first snapshot header in the image. */
111 uint64_t u64SnapshotsOffset;
112 } v2;
113 } Version;
114} QCowHeader;
115#pragma pack()
116/** Pointer to a on disk QCOW header. */
117typedef QCowHeader *PQCowHeader;
118
119/** QCOW magic value. */
120#define QCOW_MAGIC UINT32_C(0x514649fb) /* QFI\0xfb */
121/** Size of the V1 header. */
122#define QCOW_V1_HDR_SIZE (48)
123/** Size of the V2 header. */
124#define QCOW_V2_HDR_SIZE (72)
125
126/** Cluster is compressed flag for QCOW images. */
127#define QCOW_V1_COMPRESSED_FLAG RT_BIT_64(63)
128
129/** Copied flag for QCOW2 images. */
130#define QCOW_V2_COPIED_FLAG RT_BIT_64(63)
131/** Cluster is compressed flag for QCOW2 images. */
132#define QCOW_V2_COMPRESSED_FLAG RT_BIT_64(62)
133
134
135/*********************************************************************************************************************************
136* Constants And Macros, Structures and Typedefs *
137*********************************************************************************************************************************/
138
139/**
140 * QCOW L2 cache entry.
141 */
142typedef struct QCOWL2CACHEENTRY
143{
144 /** List node for the search list. */
145 RTLISTNODE NodeSearch;
146 /** List node for the LRU list. */
147 RTLISTNODE NodeLru;
148 /** Reference counter. */
149 uint32_t cRefs;
150 /** The offset of the L2 table, used as search key. */
151 uint64_t offL2Tbl;
152 /** Pointer to the cached L2 table. */
153 uint64_t *paL2Tbl;
154} QCOWL2CACHEENTRY, *PQCOWL2CACHEENTRY;
155
156/** Maximum amount of memory the cache is allowed to use. */
157#define QCOW_L2_CACHE_MEMORY_MAX (2*_1M)
158
159/** QCOW default cluster size for image version 2. */
160#define QCOW2_CLUSTER_SIZE_DEFAULT (64*_1K)
161/** QCOW default cluster size for image version 1. */
162#define QCOW_CLUSTER_SIZE_DEFAULT (4*_1K)
163/** QCOW default L2 table size in clusters. */
164#define QCOW_L2_CLUSTERS_DEFAULT (1)
165
166/**
167 * QCOW image data structure.
168 */
169typedef struct QCOWIMAGE
170{
171 /** Image name. */
172 const char *pszFilename;
173 /** Storage handle. */
174 PVDIOSTORAGE pStorage;
175
176 /** Pointer to the per-disk VD interface list. */
177 PVDINTERFACE pVDIfsDisk;
178 /** Pointer to the per-image VD interface list. */
179 PVDINTERFACE pVDIfsImage;
180 /** Error interface. */
181 PVDINTERFACEERROR pIfError;
182 /** I/O interface. */
183 PVDINTERFACEIOINT pIfIo;
184
185 /** Open flags passed by VBoxHD layer. */
186 unsigned uOpenFlags;
187 /** Image flags defined during creation or determined during open. */
188 unsigned uImageFlags;
189 /** Total size of the image. */
190 uint64_t cbSize;
191 /** Physical geometry of this image. */
192 VDGEOMETRY PCHSGeometry;
193 /** Logical geometry of this image. */
194 VDGEOMETRY LCHSGeometry;
195
196 /** Image version. */
197 unsigned uVersion;
198 /** MTime field - used only to preserve value in opened images, unmodified otherwise. */
199 uint32_t MTime;
200
201 /** Filename of the backing file if any. */
202 char *pszBackingFilename;
203 /** Offset of the filename in the image. */
204 uint64_t offBackingFilename;
205 /** Size of the backing filename excluding \0. */
206 uint32_t cbBackingFilename;
207
208 /** Next offset of a new cluster, aligned to sector size. */
209 uint64_t offNextCluster;
210 /** Cluster size in bytes. */
211 uint32_t cbCluster;
212 /** Number of entries in the L1 table. */
213 uint32_t cL1TableEntries;
214 /** Size of an L1 rounded to the next cluster size. */
215 uint32_t cbL1Table;
216 /** Pointer to the L1 table. */
217 uint64_t *paL1Table;
218 /** Offset of the L1 table. */
219 uint64_t offL1Table;
220
221 /** Size of the L2 table in bytes. */
222 uint32_t cbL2Table;
223 /** Number of entries in the L2 table. */
224 uint32_t cL2TableEntries;
225 /** Memory occupied by the L2 table cache. */
226 size_t cbL2Cache;
227 /** The sorted L2 entry list used for searching. */
228 RTLISTNODE ListSearch;
229 /** The LRU L2 entry list used for eviction. */
230 RTLISTNODE ListLru;
231
232 /** Offset of the refcount table. */
233 uint64_t offRefcountTable;
234 /** Size of the refcount table in bytes. */
235 uint32_t cbRefcountTable;
236 /** Number of entries in the refcount table. */
237 uint32_t cRefcountTableEntries;
238 /** Pointer to the refcount table. */
239 uint64_t *paRefcountTable;
240
241 /** Offset mask for a cluster. */
242 uint64_t fOffsetMask;
243 /** Number of bits to shift to get the L1 index. */
244 uint32_t cL1Shift;
245 /** L2 table mask to get the L2 index. */
246 uint64_t fL2Mask;
247 /** Number of bits to shift to get the L2 index. */
248 uint32_t cL2Shift;
249
250 /** Pointer to the L2 table we are currently allocating
251 * (can be only one at a time). */
252 PQCOWL2CACHEENTRY pL2TblAlloc;
253
254} QCOWIMAGE, *PQCOWIMAGE;
255
256/**
257 * State of the async cluster allocation.
258 */
259typedef enum QCOWCLUSTERASYNCALLOCSTATE
260{
261 /** Invalid. */
262 QCOWCLUSTERASYNCALLOCSTATE_INVALID = 0,
263 /** L2 table allocation. */
264 QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC,
265 /** Link L2 table into L1. */
266 QCOWCLUSTERASYNCALLOCSTATE_L2_LINK,
267 /** Allocate user data cluster. */
268 QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC,
269 /** Link user data cluster. */
270 QCOWCLUSTERASYNCALLOCSTATE_USER_LINK,
271 /** 32bit blowup. */
272 QCOWCLUSTERASYNCALLOCSTATE_32BIT_HACK = 0x7fffffff
273} QCOWCLUSTERASYNCALLOCSTATE, *PQCOWCLUSTERASYNCALLOCSTATE;
274
275/**
276 * Data needed to track async cluster allocation.
277 */
278typedef struct QCOWCLUSTERASYNCALLOC
279{
280 /** The state of the cluster allocation. */
281 QCOWCLUSTERASYNCALLOCSTATE enmAllocState;
282 /** Old image size to rollback in case of an error. */
283 uint64_t offNextClusterOld;
284 /** L1 index to link if any. */
285 uint32_t idxL1;
286 /** L2 index to link, required in any case. */
287 uint32_t idxL2;
288 /** Start offset of the allocated cluster. */
289 uint64_t offClusterNew;
290 /** L2 cache entry if a L2 table is allocated. */
291 PQCOWL2CACHEENTRY pL2Entry;
292 /** Number of bytes to write. */
293 size_t cbToWrite;
294} QCOWCLUSTERASYNCALLOC, *PQCOWCLUSTERASYNCALLOC;
295
296
297/*********************************************************************************************************************************
298* Static Variables *
299*********************************************************************************************************************************/
300
301/** NULL-terminated array of supported file extensions. */
302static const VDFILEEXTENSION s_aQCowFileExtensions[] =
303{
304 {"qcow", VDTYPE_HDD},
305 {"qcow2", VDTYPE_HDD},
306 {NULL, VDTYPE_INVALID}
307};
308
309
310/*********************************************************************************************************************************
311* Internal Functions *
312*********************************************************************************************************************************/
313
314/**
315 * Return power of 2 or 0 if num error.
316 *
317 * @returns The power of 2 or 0 if the given number is not a power of 2.
318 * @param u32 The number.
319 */
320static uint32_t qcowGetPowerOfTwo(uint32_t u32)
321{
322 if (u32 == 0)
323 return 0;
324 uint32_t uPower2 = 0;
325 while ((u32 & 1) == 0)
326 {
327 u32 >>= 1;
328 uPower2++;
329 }
330 return u32 == 1 ? uPower2 : 0;
331}
332
333
334/**
335 * Converts the image header to the host endianess and performs basic checks.
336 *
337 * @returns Whether the given header is valid or not.
338 * @param pHeader Pointer to the header to convert.
339 */
340static bool qcowHdrConvertToHostEndianess(PQCowHeader pHeader)
341{
342 pHeader->u32Magic = RT_BE2H_U32(pHeader->u32Magic);
343 pHeader->u32Version = RT_BE2H_U32(pHeader->u32Version);
344
345 if (pHeader->u32Magic != QCOW_MAGIC)
346 return false;
347
348 if (pHeader->u32Version == 1)
349 {
350 pHeader->Version.v1.u64BackingFileOffset = RT_BE2H_U64(pHeader->Version.v1.u64BackingFileOffset);
351 pHeader->Version.v1.u32BackingFileSize = RT_BE2H_U32(pHeader->Version.v1.u32BackingFileSize);
352 pHeader->Version.v1.u32MTime = RT_BE2H_U32(pHeader->Version.v1.u32MTime);
353 pHeader->Version.v1.u64Size = RT_BE2H_U64(pHeader->Version.v1.u64Size);
354 pHeader->Version.v1.u32CryptMethod = RT_BE2H_U32(pHeader->Version.v1.u32CryptMethod);
355 pHeader->Version.v1.u64L1TableOffset = RT_BE2H_U64(pHeader->Version.v1.u64L1TableOffset);
356 }
357 else if (pHeader->u32Version == 2)
358 {
359 pHeader->Version.v2.u64BackingFileOffset = RT_BE2H_U64(pHeader->Version.v2.u64BackingFileOffset);
360 pHeader->Version.v2.u32BackingFileSize = RT_BE2H_U32(pHeader->Version.v2.u32BackingFileSize);
361 pHeader->Version.v2.u32ClusterBits = RT_BE2H_U32(pHeader->Version.v2.u32ClusterBits);
362 pHeader->Version.v2.u64Size = RT_BE2H_U64(pHeader->Version.v2.u64Size);
363 pHeader->Version.v2.u32CryptMethod = RT_BE2H_U32(pHeader->Version.v2.u32CryptMethod);
364 pHeader->Version.v2.u32L1Size = RT_BE2H_U32(pHeader->Version.v2.u32L1Size);
365 pHeader->Version.v2.u64L1TableOffset = RT_BE2H_U64(pHeader->Version.v2.u64L1TableOffset);
366 pHeader->Version.v2.u64RefcountTableOffset = RT_BE2H_U64(pHeader->Version.v2.u64RefcountTableOffset);
367 pHeader->Version.v2.u32RefcountTableClusters = RT_BE2H_U32(pHeader->Version.v2.u32RefcountTableClusters);
368 pHeader->Version.v2.u32NbSnapshots = RT_BE2H_U32(pHeader->Version.v2.u32NbSnapshots);
369 pHeader->Version.v2.u64SnapshotsOffset = RT_BE2H_U64(pHeader->Version.v2.u64SnapshotsOffset);
370 }
371 else
372 return false;
373
374 return true;
375}
376
377/**
378 * Creates a QCOW header from the given image state.
379 *
380 * @returns nothing.
381 * @param pImage Image instance data.
382 * @param pHeader Pointer to the header to convert.
383 * @param pcbHeader Where to store the size of the header to write.
384 */
385static void qcowHdrConvertFromHostEndianess(PQCOWIMAGE pImage, PQCowHeader pHeader,
386 size_t *pcbHeader)
387{
388 memset(pHeader, 0, sizeof(QCowHeader));
389
390 pHeader->u32Magic = RT_H2BE_U32(QCOW_MAGIC);
391 pHeader->u32Version = RT_H2BE_U32(pImage->uVersion);
392 if (pImage->uVersion == 1)
393 {
394 pHeader->Version.v1.u64BackingFileOffset = RT_H2BE_U64(pImage->offBackingFilename);
395 pHeader->Version.v1.u32BackingFileSize = RT_H2BE_U32(pImage->cbBackingFilename);
396 pHeader->Version.v1.u32MTime = RT_H2BE_U32(pImage->MTime);
397 pHeader->Version.v1.u64Size = RT_H2BE_U64(pImage->cbSize);
398 pHeader->Version.v1.u8ClusterBits = (uint8_t)qcowGetPowerOfTwo(pImage->cbCluster);
399 pHeader->Version.v1.u8L2Bits = (uint8_t)qcowGetPowerOfTwo(pImage->cL2TableEntries);
400 pHeader->Version.v1.u32CryptMethod = RT_H2BE_U32(0);
401 pHeader->Version.v1.u64L1TableOffset = RT_H2BE_U64(pImage->offL1Table);
402 *pcbHeader = QCOW_V1_HDR_SIZE;
403 }
404 else if (pImage->uVersion == 2)
405 {
406 pHeader->Version.v2.u64BackingFileOffset = RT_H2BE_U64(pImage->offBackingFilename);
407 pHeader->Version.v2.u32BackingFileSize = RT_H2BE_U32(pImage->cbBackingFilename);
408 pHeader->Version.v2.u32ClusterBits = RT_H2BE_U32(qcowGetPowerOfTwo(pImage->cbCluster));
409 pHeader->Version.v2.u64Size = RT_H2BE_U64(pImage->cbSize);
410 pHeader->Version.v2.u32CryptMethod = RT_H2BE_U32(0);
411 pHeader->Version.v2.u32L1Size = RT_H2BE_U32(pImage->cL1TableEntries);
412 pHeader->Version.v2.u64L1TableOffset = RT_H2BE_U64(pImage->offL1Table);
413 pHeader->Version.v2.u64RefcountTableOffset = RT_H2BE_U64(pImage->offRefcountTable);
414 pHeader->Version.v2.u32RefcountTableClusters = RT_H2BE_U32(pImage->cbRefcountTable / pImage->cbCluster);
415 pHeader->Version.v2.u32NbSnapshots = RT_H2BE_U32(0);
416 pHeader->Version.v2.u64SnapshotsOffset = RT_H2BE_U64((uint64_t)0);
417 *pcbHeader = QCOW_V2_HDR_SIZE;
418 }
419 else
420 AssertMsgFailed(("Invalid version of the QCOW image format %d\n", pImage->uVersion));
421}
422
423/**
424 * Convert table entries from little endian to host endianess.
425 *
426 * @returns nothing.
427 * @param paTbl Pointer to the table.
428 * @param cEntries Number of entries in the table.
429 */
430static void qcowTableConvertToHostEndianess(uint64_t *paTbl, uint32_t cEntries)
431{
432 while(cEntries-- > 0)
433 {
434 *paTbl = RT_BE2H_U64(*paTbl);
435 paTbl++;
436 }
437}
438
439/**
440 * Convert table entries from host to little endian format.
441 *
442 * @returns nothing.
443 * @param paTblImg Pointer to the table which will store the little endian table.
444 * @param paTbl The source table to convert.
445 * @param cEntries Number of entries in the table.
446 */
447static void qcowTableConvertFromHostEndianess(uint64_t *paTblImg, uint64_t *paTbl,
448 uint32_t cEntries)
449{
450 while(cEntries-- > 0)
451 {
452 *paTblImg = RT_H2BE_U64(*paTbl);
453 paTbl++;
454 paTblImg++;
455 }
456}
457
458/**
459 * Creates the L2 table cache.
460 *
461 * @returns VBox status code.
462 * @param pImage The image instance data.
463 */
464static int qcowL2TblCacheCreate(PQCOWIMAGE pImage)
465{
466 pImage->cbL2Cache = 0;
467 RTListInit(&pImage->ListSearch);
468 RTListInit(&pImage->ListLru);
469
470 return VINF_SUCCESS;
471}
472
473/**
474 * Destroys the L2 table cache.
475 *
476 * @returns nothing.
477 * @param pImage The image instance data.
478 */
479static void qcowL2TblCacheDestroy(PQCOWIMAGE pImage)
480{
481 PQCOWL2CACHEENTRY pL2Entry;
482 PQCOWL2CACHEENTRY pL2Next;
483 RTListForEachSafe(&pImage->ListSearch, pL2Entry, pL2Next, QCOWL2CACHEENTRY, NodeSearch)
484 {
485 Assert(!pL2Entry->cRefs);
486
487 RTListNodeRemove(&pL2Entry->NodeSearch);
488 RTMemPageFree(pL2Entry->paL2Tbl, pImage->cbL2Table);
489 RTMemFree(pL2Entry);
490 }
491
492 pImage->cbL2Cache = 0;
493 RTListInit(&pImage->ListSearch);
494 RTListInit(&pImage->ListLru);
495}
496
497/**
498 * Returns the L2 table matching the given offset or NULL if none could be found.
499 *
500 * @returns Pointer to the L2 table cache entry or NULL.
501 * @param pImage The image instance data.
502 * @param offL2Tbl Offset of the L2 table to search for.
503 */
504static PQCOWL2CACHEENTRY qcowL2TblCacheRetain(PQCOWIMAGE pImage, uint64_t offL2Tbl)
505{
506 if ( pImage->pL2TblAlloc
507 && pImage->pL2TblAlloc->offL2Tbl == offL2Tbl)
508 {
509 pImage->pL2TblAlloc->cRefs++;
510 return pImage->pL2TblAlloc;
511 }
512
513 PQCOWL2CACHEENTRY pL2Entry;
514 RTListForEach(&pImage->ListSearch, pL2Entry, QCOWL2CACHEENTRY, NodeSearch)
515 {
516 if (pL2Entry->offL2Tbl == offL2Tbl)
517 break;
518 }
519
520 if (!RTListNodeIsDummy(&pImage->ListSearch, pL2Entry, QCOWL2CACHEENTRY, NodeSearch))
521 {
522 /* Update LRU list. */
523 RTListNodeRemove(&pL2Entry->NodeLru);
524 RTListPrepend(&pImage->ListLru, &pL2Entry->NodeLru);
525 pL2Entry->cRefs++;
526 return pL2Entry;
527 }
528
529 return NULL;
530}
531
532/**
533 * Releases a L2 table cache entry.
534 *
535 * @returns nothing.
536 * @param pL2Entry The L2 cache entry.
537 */
538static void qcowL2TblCacheEntryRelease(PQCOWL2CACHEENTRY pL2Entry)
539{
540 Assert(pL2Entry->cRefs > 0);
541 pL2Entry->cRefs--;
542}
543
544/**
545 * Allocates a new L2 table from the cache evicting old entries if required.
546 *
547 * @returns Pointer to the L2 cache entry or NULL.
548 * @param pImage The image instance data.
549 */
550static PQCOWL2CACHEENTRY qcowL2TblCacheEntryAlloc(PQCOWIMAGE pImage)
551{
552 PQCOWL2CACHEENTRY pL2Entry = NULL;
553
554 if (pImage->cbL2Cache + pImage->cbL2Table <= QCOW_L2_CACHE_MEMORY_MAX)
555 {
556 /* Add a new entry. */
557 pL2Entry = (PQCOWL2CACHEENTRY)RTMemAllocZ(sizeof(QCOWL2CACHEENTRY));
558 if (pL2Entry)
559 {
560 pL2Entry->paL2Tbl = (uint64_t *)RTMemPageAllocZ(pImage->cbL2Table);
561 if (RT_UNLIKELY(!pL2Entry->paL2Tbl))
562 {
563 RTMemFree(pL2Entry);
564 pL2Entry = NULL;
565 }
566 else
567 {
568 pL2Entry->cRefs = 1;
569 pImage->cbL2Cache += pImage->cbL2Table;
570 }
571 }
572 }
573 else
574 {
575 /* Evict the last not in use entry and use it */
576 Assert(!RTListIsEmpty(&pImage->ListLru));
577
578 RTListForEachReverse(&pImage->ListLru, pL2Entry, QCOWL2CACHEENTRY, NodeLru)
579 {
580 if (!pL2Entry->cRefs)
581 break;
582 }
583
584 if (!RTListNodeIsDummy(&pImage->ListSearch, pL2Entry, QCOWL2CACHEENTRY, NodeSearch))
585 {
586 RTListNodeRemove(&pL2Entry->NodeSearch);
587 RTListNodeRemove(&pL2Entry->NodeLru);
588 pL2Entry->offL2Tbl = 0;
589 pL2Entry->cRefs = 1;
590 }
591 else
592 pL2Entry = NULL;
593 }
594
595 return pL2Entry;
596}
597
598/**
599 * Frees a L2 table cache entry.
600 *
601 * @returns nothing.
602 * @param pImage The image instance data.
603 * @param pL2Entry The L2 cache entry to free.
604 */
605static void qcowL2TblCacheEntryFree(PQCOWIMAGE pImage, PQCOWL2CACHEENTRY pL2Entry)
606{
607 Assert(!pL2Entry->cRefs);
608 RTMemPageFree(pL2Entry->paL2Tbl, pImage->cbL2Table);
609 RTMemFree(pL2Entry);
610
611 pImage->cbL2Cache -= pImage->cbL2Table;
612}
613
614/**
615 * Inserts an entry in the L2 table cache.
616 *
617 * @returns nothing.
618 * @param pImage The image instance data.
619 * @param pL2Entry The L2 cache entry to insert.
620 */
621static void qcowL2TblCacheEntryInsert(PQCOWIMAGE pImage, PQCOWL2CACHEENTRY pL2Entry)
622{
623 Assert(pL2Entry->offL2Tbl > 0);
624
625 /* Insert at the top of the LRU list. */
626 RTListPrepend(&pImage->ListLru, &pL2Entry->NodeLru);
627
628 if (RTListIsEmpty(&pImage->ListSearch))
629 {
630 RTListAppend(&pImage->ListSearch, &pL2Entry->NodeSearch);
631 }
632 else
633 {
634 /* Insert into search list. */
635 PQCOWL2CACHEENTRY pIt;
636 pIt = RTListGetFirst(&pImage->ListSearch, QCOWL2CACHEENTRY, NodeSearch);
637 if (pIt->offL2Tbl > pL2Entry->offL2Tbl)
638 RTListPrepend(&pImage->ListSearch, &pL2Entry->NodeSearch);
639 else
640 {
641 bool fInserted = false;
642
643 RTListForEach(&pImage->ListSearch, pIt, QCOWL2CACHEENTRY, NodeSearch)
644 {
645 Assert(pIt->offL2Tbl != pL2Entry->offL2Tbl);
646 if (pIt->offL2Tbl < pL2Entry->offL2Tbl)
647 {
648 RTListNodeInsertAfter(&pIt->NodeSearch, &pL2Entry->NodeSearch);
649 fInserted = true;
650 break;
651 }
652 }
653 Assert(fInserted);
654 }
655 }
656}
657
658/**
659 * Fetches the L2 from the given offset trying the LRU cache first and
660 * reading it from the image after a cache miss.
661 *
662 * @returns VBox status code.
663 * @param pImage Image instance data.
664 * @param pIoCtx The I/O context.
665 * @param offL2Tbl The offset of the L2 table in the image.
666 * @param ppL2Entry Where to store the L2 table on success.
667 */
668static int qcowL2TblCacheFetch(PQCOWIMAGE pImage, PVDIOCTX pIoCtx, uint64_t offL2Tbl,
669 PQCOWL2CACHEENTRY *ppL2Entry)
670{
671 int rc = VINF_SUCCESS;
672
673 /* Try to fetch the L2 table from the cache first. */
674 PQCOWL2CACHEENTRY pL2Entry = qcowL2TblCacheRetain(pImage, offL2Tbl);
675 if (!pL2Entry)
676 {
677 pL2Entry = qcowL2TblCacheEntryAlloc(pImage);
678
679 if (pL2Entry)
680 {
681 /* Read from the image. */
682 PVDMETAXFER pMetaXfer;
683
684 pL2Entry->offL2Tbl = offL2Tbl;
685 rc = vdIfIoIntFileReadMeta(pImage->pIfIo, pImage->pStorage,
686 offL2Tbl, pL2Entry->paL2Tbl,
687 pImage->cbL2Table, pIoCtx,
688 &pMetaXfer, NULL, NULL);
689 if (RT_SUCCESS(rc))
690 {
691 vdIfIoIntMetaXferRelease(pImage->pIfIo, pMetaXfer);
692#if defined(RT_LITTLE_ENDIAN)
693 qcowTableConvertToHostEndianess(pL2Entry->paL2Tbl, pImage->cL2TableEntries);
694#endif
695 qcowL2TblCacheEntryInsert(pImage, pL2Entry);
696 }
697 else
698 {
699 qcowL2TblCacheEntryRelease(pL2Entry);
700 qcowL2TblCacheEntryFree(pImage, pL2Entry);
701 }
702 }
703 else
704 rc = VERR_NO_MEMORY;
705 }
706
707 if (RT_SUCCESS(rc))
708 *ppL2Entry = pL2Entry;
709
710 return rc;
711}
712
713/**
714 * Sets the L1, L2 and offset bitmasks and L1 and L2 bit shift members.
715 *
716 * @returns nothing.
717 * @param pImage The image instance data.
718 */
719static void qcowTableMasksInit(PQCOWIMAGE pImage)
720{
721 uint32_t cClusterBits, cL2TableBits;
722
723 cClusterBits = qcowGetPowerOfTwo(pImage->cbCluster);
724 cL2TableBits = qcowGetPowerOfTwo(pImage->cL2TableEntries);
725
726 Assert(cClusterBits + cL2TableBits < 64);
727
728 pImage->fOffsetMask = ((uint64_t)pImage->cbCluster - 1);
729 pImage->fL2Mask = ((uint64_t)pImage->cL2TableEntries - 1) << cClusterBits;
730 pImage->cL2Shift = cClusterBits;
731 pImage->cL1Shift = cClusterBits + cL2TableBits;
732}
733
734/**
735 * Converts a given logical offset into the
736 *
737 * @returns nothing.
738 * @param pImage The image instance data.
739 * @param off The logical offset to convert.
740 * @param pidxL1 Where to store the index in the L1 table on success.
741 * @param pidxL2 Where to store the index in the L2 table on success.
742 * @param poffCluster Where to store the offset in the cluster on success.
743 */
744DECLINLINE(void) qcowConvertLogicalOffset(PQCOWIMAGE pImage, uint64_t off, uint32_t *pidxL1,
745 uint32_t *pidxL2, uint32_t *poffCluster)
746{
747 AssertPtr(pidxL1);
748 AssertPtr(pidxL2);
749 AssertPtr(poffCluster);
750
751 *poffCluster = off & pImage->fOffsetMask;
752 *pidxL1 = off >> pImage->cL1Shift;
753 *pidxL2 = (off & pImage->fL2Mask) >> pImage->cL2Shift;
754}
755
756/**
757 * Converts Cluster size to a byte size.
758 *
759 * @returns Number of bytes derived from the given number of clusters.
760 * @param pImage The image instance data.
761 * @param cClusters The clusters to convert.
762 */
763DECLINLINE(uint64_t) qcowCluster2Byte(PQCOWIMAGE pImage, uint64_t cClusters)
764{
765 return cClusters * pImage->cbCluster;
766}
767
768/**
769 * Converts number of bytes to cluster size rounding to the next cluster.
770 *
771 * @returns Number of bytes derived from the given number of clusters.
772 * @param pImage The image instance data.
773 * @param cb Number of bytes to convert.
774 */
775DECLINLINE(uint64_t) qcowByte2Cluster(PQCOWIMAGE pImage, uint64_t cb)
776{
777 return cb / pImage->cbCluster + (cb % pImage->cbCluster ? 1 : 0);
778}
779
780/**
781 * Allocates a new cluster in the image.
782 *
783 * @returns The start offset of the new cluster in the image.
784 * @param pImage The image instance data.
785 * @param cClusters Number of clusters to allocate.
786 */
787DECLINLINE(uint64_t) qcowClusterAllocate(PQCOWIMAGE pImage, uint32_t cClusters)
788{
789 uint64_t offCluster;
790
791 offCluster = pImage->offNextCluster;
792 pImage->offNextCluster += cClusters*pImage->cbCluster;
793
794 return offCluster;
795}
796
797/**
798 * Returns the real image offset for a given cluster or an error if the cluster is not
799 * yet allocated.
800 *
801 * @returns VBox status code.
802 * VERR_VD_BLOCK_FREE if the cluster is not yet allocated.
803 * @param pImage The image instance data.
804 * @param pIoCtx The I/O context.
805 * @param idxL1 The L1 index.
806 * @param idxL2 The L2 index.
807 * @param offCluster Offset inside the cluster.
808 * @param poffImage Where to store the image offset on success;
809 */
810static int qcowConvertToImageOffset(PQCOWIMAGE pImage, PVDIOCTX pIoCtx,
811 uint32_t idxL1, uint32_t idxL2,
812 uint32_t offCluster, uint64_t *poffImage)
813{
814 int rc = VERR_VD_BLOCK_FREE;
815
816 AssertReturn(idxL1 < pImage->cL1TableEntries, VERR_INVALID_PARAMETER);
817 AssertReturn(idxL2 < pImage->cL2TableEntries, VERR_INVALID_PARAMETER);
818
819 if (pImage->paL1Table[idxL1])
820 {
821 PQCOWL2CACHEENTRY pL2Entry;
822
823 rc = qcowL2TblCacheFetch(pImage, pIoCtx, pImage->paL1Table[idxL1], &pL2Entry);
824 if (RT_SUCCESS(rc))
825 {
826 /* Get real file offset. */
827 if (pL2Entry->paL2Tbl[idxL2])
828 {
829 uint64_t off = pL2Entry->paL2Tbl[idxL2];
830
831 /* Strip flags */
832 if (pImage->uVersion == 2)
833 {
834 if (RT_UNLIKELY(off & QCOW_V2_COMPRESSED_FLAG))
835 rc = VERR_NOT_SUPPORTED;
836 else
837 off &= ~(QCOW_V2_COMPRESSED_FLAG | QCOW_V2_COPIED_FLAG);
838 }
839 else
840 {
841 if (RT_UNLIKELY(off & QCOW_V1_COMPRESSED_FLAG))
842 rc = VERR_NOT_SUPPORTED;
843 else
844 off &= ~QCOW_V1_COMPRESSED_FLAG;
845 }
846
847 *poffImage = off + offCluster;
848 }
849 else
850 rc = VERR_VD_BLOCK_FREE;
851
852 qcowL2TblCacheEntryRelease(pL2Entry);
853 }
854 }
855
856 return rc;
857}
858
859/**
860 * Write the given table to image converting to the image endianess if required.
861 *
862 * @returns VBox status code.
863 * @param pImage The image instance data.
864 * @param pIoCtx The I/O context.
865 * @param offTbl The offset the table should be written to.
866 * @param paTbl The table to write.
867 * @param cbTbl Size of the table in bytes.
868 * @param cTblEntries Number entries in the table.
869 * @param pfnComplete Callback called when the write completes.
870 * @param pvUser Opaque user data to pass in the completion callback.
871 */
872static int qcowTblWrite(PQCOWIMAGE pImage, PVDIOCTX pIoCtx, uint64_t offTbl, uint64_t *paTbl,
873 size_t cbTbl, unsigned cTblEntries,
874 PFNVDXFERCOMPLETED pfnComplete, void *pvUser)
875{
876 int rc = VINF_SUCCESS;
877
878#if defined(RT_LITTLE_ENDIAN)
879 uint64_t *paTblImg = (uint64_t *)RTMemAllocZ(cbTbl);
880 if (paTblImg)
881 {
882 qcowTableConvertFromHostEndianess(paTblImg, paTbl, cTblEntries);
883 rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
884 offTbl, paTblImg, cbTbl,
885 pIoCtx, pfnComplete, pvUser);
886 RTMemFree(paTblImg);
887 }
888 else
889 rc = VERR_NO_MEMORY;
890#else
891 /* Write table directly. */
892 RT_NOREF(cTblEntries);
893 rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
894 offTbl, paTbl, cbTbl, pIoCtx,
895 pfnComplete, pvUser);
896#endif
897
898 return rc;
899}
900
901/**
902 * Internal. Flush image data to disk.
903 */
904static int qcowFlushImage(PQCOWIMAGE pImage)
905{
906 int rc = VINF_SUCCESS;
907
908 if ( pImage->pStorage
909 && !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
910 && pImage->cbL1Table)
911 {
912 QCowHeader Header;
913
914#if defined(RT_LITTLE_ENDIAN)
915 uint64_t *paL1TblImg = (uint64_t *)RTMemAllocZ(pImage->cbL1Table);
916 if (paL1TblImg)
917 {
918 qcowTableConvertFromHostEndianess(paL1TblImg, pImage->paL1Table,
919 pImage->cL1TableEntries);
920 rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
921 pImage->offL1Table, paL1TblImg,
922 pImage->cbL1Table);
923 RTMemFree(paL1TblImg);
924 }
925 else
926 rc = VERR_NO_MEMORY;
927#else
928 /* Write L1 table directly. */
929 rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, pImage->offL1Table,
930 pImage->paL1Table, pImage->cbL1Table);
931#endif
932 if (RT_SUCCESS(rc))
933 {
934 /* Write header. */
935 size_t cbHeader = 0;
936 qcowHdrConvertFromHostEndianess(pImage, &Header, &cbHeader);
937 rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage, 0, &Header,
938 cbHeader);
939 if (RT_SUCCESS(rc))
940 rc = vdIfIoIntFileFlushSync(pImage->pIfIo, pImage->pStorage);
941 }
942 }
943
944 return rc;
945}
946
947/**
948 * Internal. Free all allocated space for representing an image except pImage,
949 * and optionally delete the image from disk.
950 */
951static int qcowFreeImage(PQCOWIMAGE pImage, bool fDelete)
952{
953 int rc = VINF_SUCCESS;
954
955 /* Freeing a never allocated image (e.g. because the open failed) is
956 * not signalled as an error. After all nothing bad happens. */
957 if (pImage)
958 {
959 if (pImage->pStorage)
960 {
961 /* No point updating the file that is deleted anyway. */
962 if (!fDelete)
963 qcowFlushImage(pImage);
964
965 rc = vdIfIoIntFileClose(pImage->pIfIo, pImage->pStorage);
966 pImage->pStorage = NULL;
967 }
968
969 if (pImage->paL1Table)
970 RTMemFree(pImage->paL1Table);
971
972 if (pImage->pszBackingFilename)
973 {
974 RTMemFree(pImage->pszBackingFilename);
975 pImage->pszBackingFilename = NULL;
976 }
977
978 qcowL2TblCacheDestroy(pImage);
979
980 if (fDelete && pImage->pszFilename)
981 vdIfIoIntFileDelete(pImage->pIfIo, pImage->pszFilename);
982 }
983
984 LogFlowFunc(("returns %Rrc\n", rc));
985 return rc;
986}
987
988/**
989 * Validates the header.
990 *
991 * @returns VBox status code.
992 * @param pImage Image backend instance data.
993 * @param pHdr The header to validate.
994 * @param cbFile The image file size in bytes.
995 */
996static int qcowHdrValidate(PQCOWIMAGE pImage, PQCowHeader pHdr, uint64_t cbFile)
997{
998 if (pHdr->u32Version == 1)
999 {
1000 /* Check that the backing filename is contained in the file. */
1001 if (pHdr->Version.v1.u64BackingFileOffset + pHdr->Version.v1.u32BackingFileSize > cbFile)
1002 return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
1003 N_("QCOW: Backing file offset and size exceed size of image '%s' (%u vs %u)"),
1004 pImage->pszFilename, pHdr->Version.v1.u64BackingFileOffset + pHdr->Version.v1.u32BackingFileSize,
1005 cbFile);
1006
1007 /* Check that the cluster bits indicate at least a 512byte sector size. */
1008 if (RT_BIT_32(pHdr->Version.v1.u8ClusterBits) < 512)
1009 return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
1010 N_("QCOW: Cluster size is too small for image '%s' (%u vs %u)"),
1011 pImage->pszFilename, RT_BIT_32(pHdr->Version.v1.u8ClusterBits), 512);
1012
1013 /*
1014 * Check for possible overflow when multiplying cluster size and L2 entry count because it is used
1015 * to calculate the number of L1 table entries later on.
1016 */
1017 if (RT_BIT_32(pHdr->Version.v1.u8L2Bits) * RT_BIT_32(pHdr->Version.v1.u8ClusterBits) == 0)
1018 return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
1019 N_("QCOW: Overflow during L1 table size calculation for image '%s'"),
1020 pImage->pszFilename);
1021 }
1022 else if (pHdr->u32Version == 2)
1023 {
1024 /* Check that the backing filename is contained in the file. */
1025 if (pHdr->Version.v2.u64BackingFileOffset + pHdr->Version.v2.u32BackingFileSize > cbFile)
1026 return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
1027 N_("QCOW: Backing file offset and size exceed size of image '%s' (%u vs %u)"),
1028 pImage->pszFilename, pHdr->Version.v2.u64BackingFileOffset + pHdr->Version.v2.u32BackingFileSize,
1029 cbFile);
1030
1031 /* Check that the cluster bits indicate at least a 512byte sector size. */
1032 if (RT_BIT_32(pHdr->Version.v2.u32ClusterBits) < 512)
1033 return vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
1034 N_("QCOW: Cluster size is too small for image '%s' (%u vs %u)"),
1035 pImage->pszFilename, RT_BIT_32(pHdr->Version.v2.u32ClusterBits), 512);
1036 }
1037 else
1038 return vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1039 N_("QCOW: Version %u in image '%s' is not supported"),
1040 pHdr->u32Version, pImage->pszFilename);
1041
1042 return VINF_SUCCESS;
1043}
1044
1045/**
1046 * Internal: Open an image, constructing all necessary data structures.
1047 */
1048static int qcowOpenImage(PQCOWIMAGE pImage, unsigned uOpenFlags)
1049{
1050 pImage->uOpenFlags = uOpenFlags;
1051
1052 pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
1053 pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
1054 AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
1055
1056 int rc = qcowL2TblCacheCreate(pImage);
1057 if (RT_SUCCESS(rc))
1058 {
1059 /* Open the image. */
1060 rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename,
1061 VDOpenFlagsToFileOpenFlags(uOpenFlags,
1062 false /* fCreate */),
1063 &pImage->pStorage);
1064 if (RT_SUCCESS(rc))
1065 {
1066 uint64_t cbFile;
1067 rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
1068 if ( RT_SUCCESS(rc)
1069 && cbFile > sizeof(QCowHeader))
1070 {
1071 QCowHeader Header;
1072
1073 rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage, 0, &Header, sizeof(Header));
1074 if ( RT_SUCCESS(rc)
1075 && qcowHdrConvertToHostEndianess(&Header))
1076 {
1077 pImage->offNextCluster = RT_ALIGN_64(cbFile, 512); /* Align image to sector boundary. */
1078 Assert(pImage->offNextCluster >= cbFile);
1079
1080 rc = qcowHdrValidate(pImage, &Header, cbFile);
1081 if (RT_SUCCESS(rc))
1082 {
1083 if (Header.u32Version == 1)
1084 {
1085 if (!Header.Version.v1.u32CryptMethod)
1086 {
1087 pImage->uVersion = 1;
1088 pImage->offBackingFilename = Header.Version.v1.u64BackingFileOffset;
1089 pImage->cbBackingFilename = Header.Version.v1.u32BackingFileSize;
1090 pImage->MTime = Header.Version.v1.u32MTime;
1091 pImage->cbSize = Header.Version.v1.u64Size;
1092 pImage->cbCluster = RT_BIT_32(Header.Version.v1.u8ClusterBits);
1093 pImage->cL2TableEntries = RT_BIT_32(Header.Version.v1.u8L2Bits);
1094 pImage->cbL2Table = RT_ALIGN_64(pImage->cL2TableEntries * sizeof(uint64_t), pImage->cbCluster);
1095 pImage->offL1Table = Header.Version.v1.u64L1TableOffset;
1096 pImage->cL1TableEntries = pImage->cbSize / (pImage->cbCluster * pImage->cL2TableEntries);
1097 if (pImage->cbSize % (pImage->cbCluster * pImage->cL2TableEntries))
1098 pImage->cL1TableEntries++;
1099 }
1100 else
1101 rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1102 N_("QCow: Encrypted image '%s' is not supported"),
1103 pImage->pszFilename);
1104 }
1105 else if (Header.u32Version == 2)
1106 {
1107 if (Header.Version.v2.u32CryptMethod)
1108 rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1109 N_("QCow: Encrypted image '%s' is not supported"),
1110 pImage->pszFilename);
1111 else if (Header.Version.v2.u32NbSnapshots)
1112 rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1113 N_("QCow: Image '%s' contains snapshots which is not supported"),
1114 pImage->pszFilename);
1115 else
1116 {
1117 pImage->uVersion = 2;
1118 pImage->offBackingFilename = Header.Version.v2.u64BackingFileOffset;
1119 pImage->cbBackingFilename = Header.Version.v2.u32BackingFileSize;
1120 pImage->cbSize = Header.Version.v2.u64Size;
1121 pImage->cbCluster = RT_BIT_32(Header.Version.v2.u32ClusterBits);
1122 pImage->cL2TableEntries = pImage->cbCluster / sizeof(uint64_t);
1123 pImage->cbL2Table = pImage->cbCluster;
1124 pImage->offL1Table = Header.Version.v2.u64L1TableOffset;
1125 pImage->cL1TableEntries = Header.Version.v2.u32L1Size;
1126 pImage->offRefcountTable = Header.Version.v2.u64RefcountTableOffset;
1127 pImage->cbRefcountTable = qcowCluster2Byte(pImage, Header.Version.v2.u32RefcountTableClusters);
1128 pImage->cRefcountTableEntries = pImage->cbRefcountTable / sizeof(uint64_t);
1129 }
1130 }
1131 else
1132 rc = vdIfError(pImage->pIfError, VERR_NOT_SUPPORTED, RT_SRC_POS,
1133 N_("QCow: Image '%s' uses version %u which is not supported"),
1134 pImage->pszFilename, Header.u32Version);
1135
1136 pImage->cbL1Table = RT_ALIGN_64(pImage->cL1TableEntries * sizeof(uint64_t), pImage->cbCluster);
1137 if ((uint64_t)pImage->cbL1Table != RT_ALIGN_64(pImage->cL1TableEntries * sizeof(uint64_t), pImage->cbCluster))
1138 rc = vdIfError(pImage->pIfError, VERR_INVALID_STATE, RT_SRC_POS,
1139 N_("QCOW: L1 table size overflow in image '%s'"),
1140 pImage->pszFilename);
1141 }
1142
1143 /** @todo Check that there are no compressed clusters in the image
1144 * (by traversing the L2 tables and checking each offset).
1145 * Refuse to open such images.
1146 */
1147
1148 if ( RT_SUCCESS(rc)
1149 && pImage->cbBackingFilename
1150 && pImage->offBackingFilename)
1151 {
1152 /* Load backing filename from image. */
1153 pImage->pszBackingFilename = (char *)RTMemAllocZ(pImage->cbBackingFilename + 1); /* +1 for \0 terminator. */
1154 if (pImage->pszBackingFilename)
1155 {
1156 rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1157 pImage->offBackingFilename, pImage->pszBackingFilename,
1158 pImage->cbBackingFilename);
1159 }
1160 else
1161 rc = VERR_NO_MEMORY;
1162 }
1163
1164 if ( RT_SUCCESS(rc)
1165 && pImage->cbRefcountTable
1166 && pImage->offRefcountTable)
1167 {
1168 /* Load refcount table. */
1169 Assert(pImage->cRefcountTableEntries);
1170 pImage->paRefcountTable = (uint64_t *)RTMemAllocZ(pImage->cbRefcountTable);
1171 if (RT_LIKELY(pImage->paRefcountTable))
1172 {
1173 rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1174 pImage->offRefcountTable, pImage->paRefcountTable,
1175 pImage->cbRefcountTable);
1176 if (RT_SUCCESS(rc))
1177 qcowTableConvertToHostEndianess(pImage->paRefcountTable,
1178 pImage->cRefcountTableEntries);
1179 else
1180 rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1181 N_("QCow: Reading refcount table of image '%s' failed"),
1182 pImage->pszFilename);
1183 }
1184 else
1185 rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
1186 N_("QCow: Allocating memory for refcount table of image '%s' failed"),
1187 pImage->pszFilename);
1188 }
1189
1190 if (RT_SUCCESS(rc))
1191 {
1192 qcowTableMasksInit(pImage);
1193
1194 /* Allocate L1 table. */
1195 pImage->paL1Table = (uint64_t *)RTMemAllocZ(pImage->cbL1Table);
1196 if (pImage->paL1Table)
1197 {
1198 /* Read from the image. */
1199 rc = vdIfIoIntFileReadSync(pImage->pIfIo, pImage->pStorage,
1200 pImage->offL1Table, pImage->paL1Table,
1201 pImage->cbL1Table);
1202 if (RT_SUCCESS(rc))
1203 qcowTableConvertToHostEndianess(pImage->paL1Table, pImage->cL1TableEntries);
1204 else
1205 rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1206 N_("QCow: Reading the L1 table for image '%s' failed"),
1207 pImage->pszFilename);
1208 }
1209 else
1210 rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS,
1211 N_("QCow: Out of memory allocating L1 table for image '%s'"),
1212 pImage->pszFilename);
1213 }
1214 }
1215 else if (RT_SUCCESS(rc))
1216 rc = VERR_VD_GEN_INVALID_HEADER;
1217 }
1218 else if (RT_SUCCESS(rc))
1219 rc = VERR_VD_GEN_INVALID_HEADER;
1220 }
1221 /* else: Do NOT signal an appropriate error here, as the VD layer has the
1222 * choice of retrying the open if it failed. */
1223 }
1224 else
1225 rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS,
1226 N_("Qcow: Creating the L2 table cache for image '%s' failed"),
1227 pImage->pszFilename);
1228
1229 if (RT_FAILURE(rc))
1230 qcowFreeImage(pImage, false);
1231 return rc;
1232}
1233
1234/**
1235 * Internal: Create a qcow image.
1236 */
1237static int qcowCreateImage(PQCOWIMAGE pImage, uint64_t cbSize,
1238 unsigned uImageFlags, const char *pszComment,
1239 PCVDGEOMETRY pPCHSGeometry,
1240 PCVDGEOMETRY pLCHSGeometry, unsigned uOpenFlags,
1241 PVDINTERFACEPROGRESS pIfProgress,
1242 unsigned uPercentStart, unsigned uPercentSpan)
1243{
1244 RT_NOREF1(pszComment);
1245 int rc;
1246 int32_t fOpen;
1247
1248 if (!(uImageFlags & VD_IMAGE_FLAGS_FIXED))
1249 {
1250 rc = qcowL2TblCacheCreate(pImage);
1251 if (RT_SUCCESS(rc))
1252 {
1253 pImage->uOpenFlags = uOpenFlags & ~VD_OPEN_FLAGS_READONLY;
1254 pImage->uImageFlags = uImageFlags;
1255 pImage->PCHSGeometry = *pPCHSGeometry;
1256 pImage->LCHSGeometry = *pLCHSGeometry;
1257 pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
1258 pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
1259 AssertPtrReturn(pImage->pIfIo, VERR_INVALID_PARAMETER);
1260
1261 /* Create image file. */
1262 fOpen = VDOpenFlagsToFileOpenFlags(pImage->uOpenFlags, true /* fCreate */);
1263 rc = vdIfIoIntFileOpen(pImage->pIfIo, pImage->pszFilename, fOpen, &pImage->pStorage);
1264 if (RT_SUCCESS(rc))
1265 {
1266 /* Init image state. */
1267 pImage->uVersion = 1; /* We create only version 1 images at the moment. */
1268 pImage->cbSize = cbSize;
1269 pImage->cbCluster = QCOW_CLUSTER_SIZE_DEFAULT;
1270 pImage->cbL2Table = qcowCluster2Byte(pImage, QCOW_L2_CLUSTERS_DEFAULT);
1271 pImage->cL2TableEntries = pImage->cbL2Table / sizeof(uint64_t);
1272 pImage->cL1TableEntries = cbSize / (pImage->cbCluster * pImage->cL2TableEntries);
1273 if (cbSize % (pImage->cbCluster * pImage->cL2TableEntries))
1274 pImage->cL1TableEntries++;
1275 pImage->cbL1Table = pImage->cL1TableEntries * sizeof(uint64_t);
1276 pImage->offL1Table = QCOW_V1_HDR_SIZE;
1277 pImage->cbBackingFilename = 0;
1278 pImage->offBackingFilename = 0;
1279 pImage->offNextCluster = RT_ALIGN_64(QCOW_V1_HDR_SIZE + pImage->cbL1Table, pImage->cbCluster);
1280 qcowTableMasksInit(pImage);
1281
1282 /* Init L1 table. */
1283 pImage->paL1Table = (uint64_t *)RTMemAllocZ(pImage->cbL1Table);
1284 if (RT_LIKELY(pImage->paL1Table))
1285 {
1286 if (RT_SUCCESS(rc))
1287 vdIfProgress(pIfProgress, uPercentStart + uPercentSpan * 98 / 100);
1288
1289 rc = qcowFlushImage(pImage);
1290 if (RT_SUCCESS(rc))
1291 rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pImage->offNextCluster);
1292 }
1293 else
1294 rc = vdIfError(pImage->pIfError, VERR_NO_MEMORY, RT_SRC_POS, N_("QCow: cannot allocate memory for L1 table of image '%s'"),
1295 pImage->pszFilename);
1296 }
1297 else
1298 rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("QCow: cannot create image '%s'"), pImage->pszFilename);
1299 }
1300 else
1301 rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("QCow: Failed to create L2 cache for image '%s'"),
1302 pImage->pszFilename);
1303 }
1304 else
1305 rc = vdIfError(pImage->pIfError, VERR_VD_INVALID_TYPE, RT_SRC_POS, N_("QCow: cannot create fixed image '%s'"), pImage->pszFilename);
1306
1307 if (RT_SUCCESS(rc))
1308 vdIfProgress(pIfProgress, uPercentStart + uPercentSpan);
1309
1310 if (RT_FAILURE(rc))
1311 qcowFreeImage(pImage, rc != VERR_ALREADY_EXISTS);
1312 return rc;
1313}
1314
1315/**
1316 * Rollback anything done during async cluster allocation.
1317 *
1318 * @returns VBox status code.
1319 * @param pImage The image instance data.
1320 * @param pIoCtx The I/O context.
1321 * @param pClusterAlloc The cluster allocation to rollback.
1322 */
1323static int qcowAsyncClusterAllocRollback(PQCOWIMAGE pImage, PVDIOCTX pIoCtx, PQCOWCLUSTERASYNCALLOC pClusterAlloc)
1324{
1325 RT_NOREF1(pIoCtx);
1326 int rc = VINF_SUCCESS;
1327
1328 switch (pClusterAlloc->enmAllocState)
1329 {
1330 case QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC:
1331 case QCOWCLUSTERASYNCALLOCSTATE_L2_LINK:
1332 {
1333 /* Revert the L1 table entry */
1334 pImage->paL1Table[pClusterAlloc->idxL1] = 0;
1335 pImage->pL2TblAlloc = NULL;
1336
1337 /* Assumption right now is that the L1 table is not modified on storage if the link fails. */
1338 rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pClusterAlloc->offNextClusterOld);
1339 qcowL2TblCacheEntryRelease(pClusterAlloc->pL2Entry); /* Release L2 cache entry. */
1340 Assert(!pClusterAlloc->pL2Entry->cRefs);
1341 qcowL2TblCacheEntryFree(pImage, pClusterAlloc->pL2Entry); /* Free it, it is not in the cache yet. */
1342 break;
1343 }
1344 case QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC:
1345 case QCOWCLUSTERASYNCALLOCSTATE_USER_LINK:
1346 {
1347 /* Assumption right now is that the L2 table is not modified if the link fails. */
1348 pClusterAlloc->pL2Entry->paL2Tbl[pClusterAlloc->idxL2] = 0;
1349 rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage, pClusterAlloc->offNextClusterOld);
1350 qcowL2TblCacheEntryRelease(pClusterAlloc->pL2Entry); /* Release L2 cache entry. */
1351 break;
1352 }
1353 default:
1354 AssertMsgFailed(("Invalid cluster allocation state %d\n", pClusterAlloc->enmAllocState));
1355 rc = VERR_INVALID_STATE;
1356 }
1357
1358 RTMemFree(pClusterAlloc);
1359 return rc;
1360}
1361
1362/**
1363 * Updates the state of the async cluster allocation.
1364 *
1365 * @returns VBox status code.
1366 * @param pBackendData The opaque backend data.
1367 * @param pIoCtx I/O context associated with this request.
1368 * @param pvUser Opaque user data passed during a read/write request.
1369 * @param rcReq Status code for the completed request.
1370 */
1371static DECLCALLBACK(int) qcowAsyncClusterAllocUpdate(void *pBackendData, PVDIOCTX pIoCtx, void *pvUser, int rcReq)
1372{
1373 int rc = VINF_SUCCESS;
1374 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1375 PQCOWCLUSTERASYNCALLOC pClusterAlloc = (PQCOWCLUSTERASYNCALLOC)pvUser;
1376
1377 if (RT_FAILURE(rcReq))
1378 return qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1379
1380 AssertPtr(pClusterAlloc->pL2Entry);
1381
1382 switch (pClusterAlloc->enmAllocState)
1383 {
1384 case QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC:
1385 {
1386 /* Update the link in the in memory L1 table now. */
1387 pImage->paL1Table[pClusterAlloc->idxL1] = pClusterAlloc->pL2Entry->offL2Tbl;
1388
1389 /* Update the link in the on disk L1 table now. */
1390 pClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_L2_LINK;
1391 rc = qcowTblWrite(pImage, pIoCtx, pImage->offL1Table, pImage->paL1Table,
1392 pImage->cbL1Table, pImage->cL1TableEntries,
1393 qcowAsyncClusterAllocUpdate, pClusterAlloc);
1394 if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1395 break;
1396 else if (RT_FAILURE(rc))
1397 {
1398 /* Rollback. */
1399 qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1400 break;
1401 }
1402 /* Success, fall through. */
1403 }
1404 /* fall thru */
1405 case QCOWCLUSTERASYNCALLOCSTATE_L2_LINK:
1406 {
1407 /* L2 link updated in L1 , save L2 entry in cache and allocate new user data cluster. */
1408 uint64_t offData = qcowClusterAllocate(pImage, 1);
1409
1410 pImage->pL2TblAlloc = NULL;
1411 qcowL2TblCacheEntryInsert(pImage, pClusterAlloc->pL2Entry);
1412
1413 pClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC;
1414 pClusterAlloc->offNextClusterOld = offData;
1415 pClusterAlloc->offClusterNew = offData;
1416
1417 /* Write data. */
1418 rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1419 offData, pIoCtx, pClusterAlloc->cbToWrite,
1420 qcowAsyncClusterAllocUpdate, pClusterAlloc);
1421 if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1422 break;
1423 else if (RT_FAILURE(rc))
1424 {
1425 qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1426 RTMemFree(pClusterAlloc);
1427 break;
1428 }
1429 }
1430 /* fall thru */
1431 case QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC:
1432 {
1433 pClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_USER_LINK;
1434 pClusterAlloc->pL2Entry->paL2Tbl[pClusterAlloc->idxL2] = pClusterAlloc->offClusterNew;
1435
1436 /* Link L2 table and update it. */
1437 rc = qcowTblWrite(pImage, pIoCtx, pImage->paL1Table[pClusterAlloc->idxL1],
1438 pClusterAlloc->pL2Entry->paL2Tbl,
1439 pImage->cbL2Table, pImage->cL2TableEntries,
1440 qcowAsyncClusterAllocUpdate, pClusterAlloc);
1441 if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1442 break;
1443 else if (RT_FAILURE(rc))
1444 {
1445 qcowAsyncClusterAllocRollback(pImage, pIoCtx, pClusterAlloc);
1446 RTMemFree(pClusterAlloc);
1447 break;
1448 }
1449 }
1450 /* fall thru */
1451 case QCOWCLUSTERASYNCALLOCSTATE_USER_LINK:
1452 {
1453 /* Everything done without errors, signal completion. */
1454 qcowL2TblCacheEntryRelease(pClusterAlloc->pL2Entry);
1455 RTMemFree(pClusterAlloc);
1456 rc = VINF_SUCCESS;
1457 break;
1458 }
1459 default:
1460 AssertMsgFailed(("Invalid async cluster allocation state %d\n",
1461 pClusterAlloc->enmAllocState));
1462 }
1463
1464 return rc;
1465}
1466
1467/** @copydoc VDIMAGEBACKEND::pfnProbe */
1468static DECLCALLBACK(int) qcowProbe(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
1469 PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
1470{
1471 RT_NOREF1(pVDIfsDisk);
1472 LogFlowFunc(("pszFilename=\"%s\" pVDIfsDisk=%#p pVDIfsImage=%#p\n", pszFilename, pVDIfsDisk, pVDIfsImage));
1473 PVDIOSTORAGE pStorage = NULL;
1474 uint64_t cbFile;
1475 int rc = VINF_SUCCESS;
1476
1477 /* Get I/O interface. */
1478 PVDINTERFACEIOINT pIfIo = VDIfIoIntGet(pVDIfsImage);
1479 AssertPtrReturn(pIfIo, VERR_INVALID_PARAMETER);
1480 AssertReturn((VALID_PTR(pszFilename) && *pszFilename), VERR_INVALID_PARAMETER);
1481
1482 /*
1483 * Open the file and read the footer.
1484 */
1485 rc = vdIfIoIntFileOpen(pIfIo, pszFilename,
1486 VDOpenFlagsToFileOpenFlags(VD_OPEN_FLAGS_READONLY,
1487 false /* fCreate */),
1488 &pStorage);
1489 if (RT_SUCCESS(rc))
1490 {
1491 rc = vdIfIoIntFileGetSize(pIfIo, pStorage, &cbFile);
1492 if ( RT_SUCCESS(rc)
1493 && cbFile > sizeof(QCowHeader))
1494 {
1495 QCowHeader Header;
1496
1497 rc = vdIfIoIntFileReadSync(pIfIo, pStorage, 0, &Header, sizeof(Header));
1498 if ( RT_SUCCESS(rc)
1499 && qcowHdrConvertToHostEndianess(&Header))
1500 *penmType = VDTYPE_HDD;
1501 else
1502 rc = VERR_VD_GEN_INVALID_HEADER;
1503 }
1504 else
1505 rc = VERR_VD_GEN_INVALID_HEADER;
1506 }
1507
1508 if (pStorage)
1509 vdIfIoIntFileClose(pIfIo, pStorage);
1510
1511 LogFlowFunc(("returns %Rrc\n", rc));
1512 return rc;
1513}
1514
1515/** @copydoc VDIMAGEBACKEND::pfnOpen */
1516static DECLCALLBACK(int) qcowOpen(const char *pszFilename, unsigned uOpenFlags,
1517 PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1518 VDTYPE enmType, void **ppBackendData)
1519{
1520 RT_NOREF1(enmType); /**< @todo r=klaus make use of the type info. */
1521
1522 LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p enmType=%u ppBackendData=%#p\n",
1523 pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, enmType, ppBackendData));
1524 int rc;
1525
1526 /* Check open flags. All valid flags are supported. */
1527 AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
1528 AssertReturn((VALID_PTR(pszFilename) && *pszFilename), VERR_INVALID_PARAMETER);
1529
1530 PQCOWIMAGE pImage = (PQCOWIMAGE)RTMemAllocZ(sizeof(QCOWIMAGE));
1531 if (RT_LIKELY(pImage))
1532 {
1533 pImage->pszFilename = pszFilename;
1534 pImage->pStorage = NULL;
1535 pImage->pVDIfsDisk = pVDIfsDisk;
1536 pImage->pVDIfsImage = pVDIfsImage;
1537
1538 rc = qcowOpenImage(pImage, uOpenFlags);
1539 if (RT_SUCCESS(rc))
1540 *ppBackendData = pImage;
1541 else
1542 RTMemFree(pImage);
1543 }
1544 else
1545 rc = VERR_NO_MEMORY;
1546
1547 LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1548 return rc;
1549}
1550
1551/** @copydoc VDIMAGEBACKEND::pfnCreate */
1552static DECLCALLBACK(int) qcowCreate(const char *pszFilename, uint64_t cbSize,
1553 unsigned uImageFlags, const char *pszComment,
1554 PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
1555 PCRTUUID pUuid, unsigned uOpenFlags,
1556 unsigned uPercentStart, unsigned uPercentSpan,
1557 PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
1558 PVDINTERFACE pVDIfsOperation, VDTYPE enmType,
1559 void **ppBackendData)
1560{
1561 RT_NOREF1(pUuid);
1562 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 enmType=%u ppBackendData=%#p",
1563 pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, enmType, ppBackendData));
1564 int rc;
1565
1566 /* Check the VD container type. */
1567 if (enmType != VDTYPE_HDD)
1568 return VERR_VD_INVALID_TYPE;
1569
1570 /* Check open flags. All valid flags are supported. */
1571 AssertReturn(!(uOpenFlags & ~VD_OPEN_FLAGS_MASK), VERR_INVALID_PARAMETER);
1572 AssertReturn( VALID_PTR(pszFilename)
1573 && *pszFilename
1574 && VALID_PTR(pPCHSGeometry)
1575 && VALID_PTR(pLCHSGeometry), VERR_INVALID_PARAMETER);
1576
1577 PQCOWIMAGE pImage = (PQCOWIMAGE)RTMemAllocZ(sizeof(QCOWIMAGE));
1578 if (RT_LIKELY(pImage))
1579 {
1580 PVDINTERFACEPROGRESS pIfProgress = VDIfProgressGet(pVDIfsOperation);
1581
1582 pImage->pszFilename = pszFilename;
1583 pImage->pStorage = NULL;
1584 pImage->pVDIfsDisk = pVDIfsDisk;
1585 pImage->pVDIfsImage = pVDIfsImage;
1586
1587 rc = qcowCreateImage(pImage, cbSize, uImageFlags, pszComment,
1588 pPCHSGeometry, pLCHSGeometry, uOpenFlags,
1589 pIfProgress, uPercentStart, uPercentSpan);
1590 if (RT_SUCCESS(rc))
1591 {
1592 /* So far the image is opened in read/write mode. Make sure the
1593 * image is opened in read-only mode if the caller requested that. */
1594 if (uOpenFlags & VD_OPEN_FLAGS_READONLY)
1595 {
1596 qcowFreeImage(pImage, false);
1597 rc = qcowOpenImage(pImage, uOpenFlags);
1598 }
1599
1600 if (RT_SUCCESS(rc))
1601 *ppBackendData = pImage;
1602 }
1603
1604 if (RT_FAILURE(rc))
1605 RTMemFree(pImage);
1606 }
1607 else
1608 rc = VERR_NO_MEMORY;
1609
1610 LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
1611 return rc;
1612}
1613
1614/** @copydoc VDIMAGEBACKEND::pfnRename */
1615static DECLCALLBACK(int) qcowRename(void *pBackendData, const char *pszFilename)
1616{
1617 LogFlowFunc(("pBackendData=%#p pszFilename=%#p\n", pBackendData, pszFilename));
1618 int rc = VINF_SUCCESS;
1619 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1620
1621 /* Check arguments. */
1622 AssertReturn((pImage && pszFilename && *pszFilename), VERR_INVALID_PARAMETER);
1623
1624 /* Close the image. */
1625 rc = qcowFreeImage(pImage, false);
1626 if (RT_SUCCESS(rc))
1627 {
1628 /* Rename the file. */
1629 rc = vdIfIoIntFileMove(pImage->pIfIo, pImage->pszFilename, pszFilename, 0);
1630 if (RT_SUCCESS(rc))
1631 {
1632 /* Update pImage with the new information. */
1633 pImage->pszFilename = pszFilename;
1634
1635 /* Open the old image with new name. */
1636 rc = qcowOpenImage(pImage, pImage->uOpenFlags);
1637 }
1638 else
1639 {
1640 /* The move failed, try to reopen the original image. */
1641 int rc2 = qcowOpenImage(pImage, pImage->uOpenFlags);
1642 if (RT_FAILURE(rc2))
1643 rc = rc2;
1644 }
1645 }
1646
1647 LogFlowFunc(("returns %Rrc\n", rc));
1648 return rc;
1649}
1650
1651/** @copydoc VDIMAGEBACKEND::pfnClose */
1652static DECLCALLBACK(int) qcowClose(void *pBackendData, bool fDelete)
1653{
1654 LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
1655 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1656
1657 int rc = qcowFreeImage(pImage, fDelete);
1658 RTMemFree(pImage);
1659
1660 LogFlowFunc(("returns %Rrc\n", rc));
1661 return rc;
1662}
1663
1664static DECLCALLBACK(int) qcowRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
1665 PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
1666{
1667 LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToRead=%zu pcbActuallyRead=%#p\n",
1668 pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
1669 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1670 uint32_t offCluster = 0;
1671 uint32_t idxL1 = 0;
1672 uint32_t idxL2 = 0;
1673 uint64_t offFile = 0;
1674 int rc;
1675
1676 AssertPtr(pImage);
1677 Assert(uOffset % 512 == 0);
1678 Assert(cbToRead % 512 == 0);
1679 AssertReturn((VALID_PTR(pIoCtx) && cbToRead), VERR_INVALID_PARAMETER);
1680 AssertReturn(uOffset + cbToRead <= pImage->cbSize, VERR_INVALID_PARAMETER);
1681
1682 qcowConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
1683
1684 /* Clip read size to remain in the cluster. */
1685 cbToRead = RT_MIN(cbToRead, pImage->cbCluster - offCluster);
1686
1687 /* Get offset in image. */
1688 rc = qcowConvertToImageOffset(pImage, pIoCtx, idxL1, idxL2, offCluster, &offFile);
1689 if (RT_SUCCESS(rc))
1690 rc = vdIfIoIntFileReadUser(pImage->pIfIo, pImage->pStorage, offFile,
1691 pIoCtx, cbToRead);
1692
1693 if ( ( RT_SUCCESS(rc)
1694 || rc == VERR_VD_BLOCK_FREE
1695 || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1696 && pcbActuallyRead)
1697 *pcbActuallyRead = cbToRead;
1698
1699 LogFlowFunc(("returns %Rrc\n", rc));
1700 return rc;
1701}
1702
1703static DECLCALLBACK(int) qcowWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
1704 PVDIOCTX pIoCtx, size_t *pcbWriteProcess, size_t *pcbPreRead,
1705 size_t *pcbPostRead, unsigned fWrite)
1706{
1707 LogFlowFunc(("pBackendData=%#p uOffset=%llu pIoCtx=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n",
1708 pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
1709 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1710 uint32_t offCluster = 0;
1711 uint32_t idxL1 = 0;
1712 uint32_t idxL2 = 0;
1713 uint64_t offImage = 0;
1714 int rc = VINF_SUCCESS;
1715
1716 AssertPtr(pImage);
1717 Assert(!(uOffset % 512));
1718 Assert(!(cbToWrite % 512));
1719 AssertReturn((VALID_PTR(pIoCtx) && cbToWrite), VERR_INVALID_PARAMETER);
1720 AssertReturn(uOffset + cbToWrite <= pImage->cbSize, VERR_INVALID_PARAMETER);
1721
1722 if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1723 {
1724 /* Convert offset to L1, L2 index and cluster offset. */
1725 qcowConvertLogicalOffset(pImage, uOffset, &idxL1, &idxL2, &offCluster);
1726
1727 /* Clip write size to remain in the cluster. */
1728 cbToWrite = RT_MIN(cbToWrite, pImage->cbCluster - offCluster);
1729 Assert(!(cbToWrite % 512));
1730
1731 /* Get offset in image. */
1732 rc = qcowConvertToImageOffset(pImage, pIoCtx, idxL1, idxL2, offCluster, &offImage);
1733 if (RT_SUCCESS(rc))
1734 rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1735 offImage, pIoCtx, cbToWrite, NULL, NULL);
1736 else if (rc == VERR_VD_BLOCK_FREE)
1737 {
1738 if ( cbToWrite == pImage->cbCluster
1739 && !(fWrite & VD_WRITE_NO_ALLOC))
1740 {
1741 PQCOWL2CACHEENTRY pL2Entry = NULL;
1742
1743 /* Full cluster write to previously unallocated cluster.
1744 * Allocate cluster and write data. */
1745 Assert(!offCluster);
1746
1747 do
1748 {
1749 /* Check if we have to allocate a new cluster for L2 tables. */
1750 if (!pImage->paL1Table[idxL1])
1751 {
1752 uint64_t offL2Tbl;
1753 PQCOWCLUSTERASYNCALLOC pL2ClusterAlloc = NULL;
1754
1755 /* Allocate new async cluster allocation state. */
1756 pL2ClusterAlloc = (PQCOWCLUSTERASYNCALLOC)RTMemAllocZ(sizeof(QCOWCLUSTERASYNCALLOC));
1757 if (RT_UNLIKELY(!pL2ClusterAlloc))
1758 {
1759 rc = VERR_NO_MEMORY;
1760 break;
1761 }
1762
1763 pL2Entry = qcowL2TblCacheEntryAlloc(pImage);
1764 if (!pL2Entry)
1765 {
1766 rc = VERR_NO_MEMORY;
1767 RTMemFree(pL2ClusterAlloc);
1768 break;
1769 }
1770
1771 offL2Tbl = qcowClusterAllocate(pImage, qcowByte2Cluster(pImage, pImage->cbL2Table));
1772 pL2Entry->offL2Tbl = offL2Tbl;
1773 memset(pL2Entry->paL2Tbl, 0, pImage->cbL2Table);
1774
1775 pL2ClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_L2_ALLOC;
1776 pL2ClusterAlloc->offNextClusterOld = offL2Tbl;
1777 pL2ClusterAlloc->offClusterNew = offL2Tbl;
1778 pL2ClusterAlloc->idxL1 = idxL1;
1779 pL2ClusterAlloc->idxL2 = idxL2;
1780 pL2ClusterAlloc->cbToWrite = cbToWrite;
1781 pL2ClusterAlloc->pL2Entry = pL2Entry;
1782
1783 pImage->pL2TblAlloc = pL2Entry;
1784
1785 LogFlowFunc(("Allocating new L2 table at cluster offset %llu\n", offL2Tbl));
1786
1787 /*
1788 * Write the L2 table first and link to the L1 table afterwards.
1789 * If something unexpected happens the worst case which can happen
1790 * is a leak of some clusters.
1791 */
1792 rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1793 offL2Tbl, pL2Entry->paL2Tbl, pImage->cbL2Table, pIoCtx,
1794 qcowAsyncClusterAllocUpdate, pL2ClusterAlloc);
1795 if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1796 break;
1797 else if (RT_FAILURE(rc))
1798 {
1799 RTMemFree(pL2ClusterAlloc);
1800 qcowL2TblCacheEntryFree(pImage, pL2Entry);
1801 break;
1802 }
1803
1804 rc = qcowAsyncClusterAllocUpdate(pImage, pIoCtx, pL2ClusterAlloc, rc);
1805 }
1806 else
1807 {
1808 LogFlowFunc(("Fetching L2 table at cluster offset %llu\n", pImage->paL1Table[idxL1]));
1809
1810 rc = qcowL2TblCacheFetch(pImage, pIoCtx, pImage->paL1Table[idxL1],
1811 &pL2Entry);
1812 if (RT_SUCCESS(rc))
1813 {
1814 PQCOWCLUSTERASYNCALLOC pDataClusterAlloc = NULL;
1815
1816 /* Allocate new async cluster allocation state. */
1817 pDataClusterAlloc = (PQCOWCLUSTERASYNCALLOC)RTMemAllocZ(sizeof(QCOWCLUSTERASYNCALLOC));
1818 if (RT_UNLIKELY(!pDataClusterAlloc))
1819 {
1820 rc = VERR_NO_MEMORY;
1821 break;
1822 }
1823
1824 /* Allocate new cluster for the data. */
1825 uint64_t offData = qcowClusterAllocate(pImage, 1);
1826
1827 pDataClusterAlloc->enmAllocState = QCOWCLUSTERASYNCALLOCSTATE_USER_ALLOC;
1828 pDataClusterAlloc->offNextClusterOld = offData;
1829 pDataClusterAlloc->offClusterNew = offData;
1830 pDataClusterAlloc->idxL1 = idxL1;
1831 pDataClusterAlloc->idxL2 = idxL2;
1832 pDataClusterAlloc->cbToWrite = cbToWrite;
1833 pDataClusterAlloc->pL2Entry = pL2Entry;
1834
1835 /* Write data. */
1836 rc = vdIfIoIntFileWriteUser(pImage->pIfIo, pImage->pStorage,
1837 offData, pIoCtx, cbToWrite,
1838 qcowAsyncClusterAllocUpdate, pDataClusterAlloc);
1839 if (rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1840 break;
1841 else if (RT_FAILURE(rc))
1842 {
1843 RTMemFree(pDataClusterAlloc);
1844 break;
1845 }
1846
1847 rc = qcowAsyncClusterAllocUpdate(pImage, pIoCtx, pDataClusterAlloc, rc);
1848 }
1849 }
1850
1851 } while (0);
1852
1853 *pcbPreRead = 0;
1854 *pcbPostRead = 0;
1855 }
1856 else
1857 {
1858 /* Trying to do a partial write to an unallocated cluster. Don't do
1859 * anything except letting the upper layer know what to do. */
1860 *pcbPreRead = offCluster;
1861 *pcbPostRead = pImage->cbCluster - cbToWrite - *pcbPreRead;
1862 }
1863 }
1864
1865 if (pcbWriteProcess)
1866 *pcbWriteProcess = cbToWrite;
1867 }
1868 else
1869 rc = VERR_VD_IMAGE_READ_ONLY;
1870
1871 LogFlowFunc(("returns %Rrc\n", rc));
1872 return rc;
1873}
1874
1875static DECLCALLBACK(int) qcowFlush(void *pBackendData, PVDIOCTX pIoCtx)
1876{
1877 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1878 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1879 int rc = VINF_SUCCESS;
1880
1881 AssertPtr(pImage);
1882 AssertPtrReturn(pIoCtx, VERR_INVALID_PARAMETER);
1883
1884 if ( pImage->pStorage
1885 && !(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
1886 {
1887 QCowHeader Header;
1888
1889 rc = qcowTblWrite(pImage, pIoCtx, pImage->offL1Table, pImage->paL1Table,
1890 pImage->cbL1Table, pImage->cL1TableEntries, NULL, NULL);
1891 if (RT_SUCCESS(rc) || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1892 {
1893 /* Write header. */
1894 size_t cbHeader = 0;
1895 qcowHdrConvertFromHostEndianess(pImage, &Header, &cbHeader);
1896 rc = vdIfIoIntFileWriteMeta(pImage->pIfIo, pImage->pStorage,
1897 0, &Header, cbHeader,
1898 pIoCtx, NULL, NULL);
1899 if (RT_SUCCESS(rc) || rc == VERR_VD_ASYNC_IO_IN_PROGRESS)
1900 rc = vdIfIoIntFileFlush(pImage->pIfIo, pImage->pStorage,
1901 pIoCtx, NULL, NULL);
1902 }
1903 }
1904
1905 LogFlowFunc(("returns %Rrc\n", rc));
1906 return rc;
1907}
1908
1909/** @copydoc VDIMAGEBACKEND::pfnGetVersion */
1910static DECLCALLBACK(unsigned) qcowGetVersion(void *pBackendData)
1911{
1912 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1913 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1914
1915 AssertPtrReturn(pImage, 0);
1916
1917 return pImage->uVersion;
1918}
1919
1920/** @copydoc VDIMAGEBACKEND::pfnGetSectorSize */
1921static DECLCALLBACK(uint32_t) qcowGetSectorSize(void *pBackendData)
1922{
1923 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1924 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1925 uint32_t cb = 0;
1926
1927 AssertPtrReturn(pImage, 0);
1928
1929 if (pImage->pStorage)
1930 cb = 512;
1931
1932 LogFlowFunc(("returns %u\n", cb));
1933 return cb;
1934}
1935
1936/** @copydoc VDIMAGEBACKEND::pfnGetSize */
1937static DECLCALLBACK(uint64_t) qcowGetSize(void *pBackendData)
1938{
1939 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1940 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1941 uint64_t cb = 0;
1942
1943 AssertPtrReturn(pImage, 0);
1944
1945 if (pImage->pStorage)
1946 cb = pImage->cbSize;
1947
1948 LogFlowFunc(("returns %llu\n", cb));
1949 return cb;
1950}
1951
1952/** @copydoc VDIMAGEBACKEND::pfnGetFileSize */
1953static DECLCALLBACK(uint64_t) qcowGetFileSize(void *pBackendData)
1954{
1955 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
1956 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1957 uint64_t cb = 0;
1958
1959 AssertPtrReturn(pImage, 0);
1960
1961 uint64_t cbFile;
1962 if (pImage->pStorage)
1963 {
1964 int rc = vdIfIoIntFileGetSize(pImage->pIfIo, pImage->pStorage, &cbFile);
1965 if (RT_SUCCESS(rc))
1966 cb += cbFile;
1967 }
1968
1969 LogFlowFunc(("returns %lld\n", cb));
1970 return cb;
1971}
1972
1973/** @copydoc VDIMAGEBACKEND::pfnGetPCHSGeometry */
1974static DECLCALLBACK(int) qcowGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
1975{
1976 LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
1977 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1978 int rc = VINF_SUCCESS;
1979
1980 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
1981
1982 if (pImage->PCHSGeometry.cCylinders)
1983 *pPCHSGeometry = pImage->PCHSGeometry;
1984 else
1985 rc = VERR_VD_GEOMETRY_NOT_SET;
1986
1987 LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1988 return rc;
1989}
1990
1991/** @copydoc VDIMAGEBACKEND::pfnSetPCHSGeometry */
1992static DECLCALLBACK(int) qcowSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
1993{
1994 LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n",
1995 pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
1996 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
1997 int rc = VINF_SUCCESS;
1998
1999 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2000
2001 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2002 rc = VERR_VD_IMAGE_READ_ONLY;
2003 else
2004 pImage->PCHSGeometry = *pPCHSGeometry;
2005
2006 LogFlowFunc(("returns %Rrc\n", rc));
2007 return rc;
2008}
2009
2010/** @copydoc VDIMAGEBACKEND::pfnGetLCHSGeometry */
2011static DECLCALLBACK(int) qcowGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
2012{
2013 LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
2014 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2015 int rc = VINF_SUCCESS;
2016
2017 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2018
2019 if (pImage->LCHSGeometry.cCylinders)
2020 *pLCHSGeometry = pImage->LCHSGeometry;
2021 else
2022 rc = VERR_VD_GEOMETRY_NOT_SET;
2023
2024 LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders,
2025 pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
2026 return rc;
2027}
2028
2029/** @copydoc VDIMAGEBACKEND::pfnSetLCHSGeometry */
2030static DECLCALLBACK(int) qcowSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
2031{
2032 LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData,
2033 pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
2034 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2035 int rc = VINF_SUCCESS;
2036
2037 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2038
2039 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2040 rc = VERR_VD_IMAGE_READ_ONLY;
2041 else
2042 pImage->LCHSGeometry = *pLCHSGeometry;
2043
2044 LogFlowFunc(("returns %Rrc\n", rc));
2045 return rc;
2046}
2047
2048/** @copydoc VDIMAGEBACKEND::pfnGetImageFlags */
2049static DECLCALLBACK(unsigned) qcowGetImageFlags(void *pBackendData)
2050{
2051 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2052 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2053
2054 AssertPtrReturn(pImage, 0);
2055
2056 LogFlowFunc(("returns %#x\n", pImage->uImageFlags));
2057 return pImage->uImageFlags;
2058}
2059
2060/** @copydoc VDIMAGEBACKEND::pfnGetOpenFlags */
2061static DECLCALLBACK(unsigned) qcowGetOpenFlags(void *pBackendData)
2062{
2063 LogFlowFunc(("pBackendData=%#p\n", pBackendData));
2064 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2065
2066 AssertPtrReturn(pImage, 0);
2067
2068 LogFlowFunc(("returns %#x\n", pImage->uOpenFlags));
2069 return pImage->uOpenFlags;
2070}
2071
2072/** @copydoc VDIMAGEBACKEND::pfnSetOpenFlags */
2073static DECLCALLBACK(int) qcowSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
2074{
2075 LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
2076 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2077 int rc = VINF_SUCCESS;
2078
2079 /* Image must be opened and the new flags must be valid. */
2080 if (!pImage || (uOpenFlags & ~( VD_OPEN_FLAGS_READONLY | VD_OPEN_FLAGS_INFO
2081 | VD_OPEN_FLAGS_ASYNC_IO | VD_OPEN_FLAGS_SHAREABLE
2082 | VD_OPEN_FLAGS_SEQUENTIAL | VD_OPEN_FLAGS_SKIP_CONSISTENCY_CHECKS)))
2083 rc = VERR_INVALID_PARAMETER;
2084 else
2085 {
2086 /* Implement this operation via reopening the image. */
2087 rc = qcowFreeImage(pImage, false);
2088 if (RT_SUCCESS(rc))
2089 rc = qcowOpenImage(pImage, uOpenFlags);
2090 }
2091
2092 LogFlowFunc(("returns %Rrc\n", rc));
2093 return rc;
2094}
2095
2096/** @copydoc VDIMAGEBACKEND::pfnGetComment */
2097static DECLCALLBACK(int) qcowGetComment(void *pBackendData, char *pszComment, size_t cbComment)
2098{
2099 RT_NOREF2(pszComment, cbComment);
2100 LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
2101 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2102
2103 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2104
2105 LogFlowFunc(("returns %Rrc comment='%s'\n", VERR_NOT_SUPPORTED, pszComment));
2106 return VERR_NOT_SUPPORTED;
2107}
2108
2109/** @copydoc VDIMAGEBACKEND::pfnSetComment */
2110static DECLCALLBACK(int) qcowSetComment(void *pBackendData, const char *pszComment)
2111{
2112 RT_NOREF1(pszComment);
2113 LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
2114 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2115
2116 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2117
2118 int rc;
2119 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2120 rc = VERR_VD_IMAGE_READ_ONLY;
2121 else
2122 rc = VERR_NOT_SUPPORTED;
2123
2124 LogFlowFunc(("returns %Rrc\n", rc));
2125 return rc;
2126}
2127
2128/** @copydoc VDIMAGEBACKEND::pfnGetUuid */
2129static DECLCALLBACK(int) qcowGetUuid(void *pBackendData, PRTUUID pUuid)
2130{
2131 RT_NOREF1(pUuid);
2132 LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2133 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2134
2135 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2136
2137 LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
2138 return VERR_NOT_SUPPORTED;
2139}
2140
2141/** @copydoc VDIMAGEBACKEND::pfnSetUuid */
2142static DECLCALLBACK(int) qcowSetUuid(void *pBackendData, PCRTUUID pUuid)
2143{
2144 RT_NOREF1(pUuid);
2145 LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2146 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2147
2148 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2149
2150 int rc;
2151 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2152 rc = VERR_VD_IMAGE_READ_ONLY;
2153 else
2154 rc = VERR_NOT_SUPPORTED;
2155
2156 LogFlowFunc(("returns %Rrc\n", rc));
2157 return rc;
2158}
2159
2160/** @copydoc VDIMAGEBACKEND::pfnGetModificationUuid */
2161static DECLCALLBACK(int) qcowGetModificationUuid(void *pBackendData, PRTUUID pUuid)
2162{
2163 RT_NOREF1(pUuid);
2164 LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2165 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2166
2167 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2168
2169 LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
2170 return VERR_NOT_SUPPORTED;
2171}
2172
2173/** @copydoc VDIMAGEBACKEND::pfnSetModificationUuid */
2174static DECLCALLBACK(int) qcowSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
2175{
2176 RT_NOREF1(pUuid);
2177 LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2178 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2179
2180 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2181
2182 int rc;
2183 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2184 rc = VERR_VD_IMAGE_READ_ONLY;
2185 else
2186 rc = VERR_NOT_SUPPORTED;
2187
2188 LogFlowFunc(("returns %Rrc\n", rc));
2189 return rc;
2190}
2191
2192/** @copydoc VDIMAGEBACKEND::pfnGetParentUuid */
2193static DECLCALLBACK(int) qcowGetParentUuid(void *pBackendData, PRTUUID pUuid)
2194{
2195 RT_NOREF1(pUuid);
2196 LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2197 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2198
2199 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2200
2201 LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
2202 return VERR_NOT_SUPPORTED;
2203}
2204
2205/** @copydoc VDIMAGEBACKEND::pfnSetParentUuid */
2206static DECLCALLBACK(int) qcowSetParentUuid(void *pBackendData, PCRTUUID pUuid)
2207{
2208 RT_NOREF1(pUuid);
2209 LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2210 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2211
2212 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2213
2214 int rc;
2215 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2216 rc = VERR_VD_IMAGE_READ_ONLY;
2217 else
2218 rc = VERR_NOT_SUPPORTED;
2219
2220 LogFlowFunc(("returns %Rrc\n", rc));
2221 return rc;
2222}
2223
2224/** @copydoc VDIMAGEBACKEND::pfnGetParentModificationUuid */
2225static DECLCALLBACK(int) qcowGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
2226{
2227 RT_NOREF1(pUuid);
2228 LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
2229 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2230
2231 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2232
2233 LogFlowFunc(("returns %Rrc (%RTuuid)\n", VERR_NOT_SUPPORTED, pUuid));
2234 return VERR_NOT_SUPPORTED;
2235}
2236
2237/** @copydoc VDIMAGEBACKEND::pfnSetParentModificationUuid */
2238static DECLCALLBACK(int) qcowSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
2239{
2240 RT_NOREF1(pUuid);
2241 LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
2242 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2243
2244 AssertPtrReturn(pImage, VERR_VD_NOT_OPENED);
2245
2246 int rc;
2247 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2248 rc = VERR_VD_IMAGE_READ_ONLY;
2249 else
2250 rc = VERR_NOT_SUPPORTED;
2251
2252 LogFlowFunc(("returns %Rrc\n", rc));
2253 return rc;
2254}
2255
2256/** @copydoc VDIMAGEBACKEND::pfnDump */
2257static DECLCALLBACK(void) qcowDump(void *pBackendData)
2258{
2259 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2260
2261 AssertPtrReturnVoid(pImage);
2262 vdIfErrorMessage(pImage->pIfError, "Header: Geometry PCHS=%u/%u/%u LCHS=%u/%u/%u cbSector=%llu\n",
2263 pImage->PCHSGeometry.cCylinders, pImage->PCHSGeometry.cHeads, pImage->PCHSGeometry.cSectors,
2264 pImage->LCHSGeometry.cCylinders, pImage->LCHSGeometry.cHeads, pImage->LCHSGeometry.cSectors,
2265 pImage->cbSize / 512);
2266}
2267
2268/** @copydoc VDIMAGEBACKEND::pfnGetParentFilename */
2269static DECLCALLBACK(int) qcowGetParentFilename(void *pBackendData, char **ppszParentFilename)
2270{
2271 int rc = VINF_SUCCESS;
2272 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2273
2274 AssertPtr(pImage);
2275 if (pImage)
2276 if (pImage->pszBackingFilename)
2277 *ppszParentFilename = RTStrDup(pImage->pszBackingFilename);
2278 else
2279 rc = VERR_NOT_SUPPORTED;
2280 else
2281 rc = VERR_VD_NOT_OPENED;
2282
2283 LogFlowFunc(("returns %Rrc\n", rc));
2284 return rc;
2285}
2286
2287/** @copydoc VDIMAGEBACKEND::pfnSetParentFilename */
2288static DECLCALLBACK(int) qcowSetParentFilename(void *pBackendData, const char *pszParentFilename)
2289{
2290 int rc = VINF_SUCCESS;
2291 PQCOWIMAGE pImage = (PQCOWIMAGE)pBackendData;
2292
2293 AssertPtr(pImage);
2294 if (pImage)
2295 {
2296 if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
2297 rc = VERR_VD_IMAGE_READ_ONLY;
2298 else if ( pImage->pszBackingFilename
2299 && (strlen(pszParentFilename) > pImage->cbBackingFilename))
2300 rc = VERR_NOT_SUPPORTED; /* The new filename is longer than the old one. */
2301 else
2302 {
2303 if (pImage->pszBackingFilename)
2304 RTStrFree(pImage->pszBackingFilename);
2305 pImage->pszBackingFilename = RTStrDup(pszParentFilename);
2306 if (!pImage->pszBackingFilename)
2307 rc = VERR_NO_MEMORY;
2308 else
2309 {
2310 if (!pImage->offBackingFilename)
2311 {
2312 /* Allocate new cluster. */
2313 uint64_t offData = qcowClusterAllocate(pImage, 1);
2314
2315 Assert((offData & UINT32_MAX) == offData);
2316 pImage->offBackingFilename = (uint32_t)offData;
2317 pImage->cbBackingFilename = (uint32_t)strlen(pszParentFilename);
2318 rc = vdIfIoIntFileSetSize(pImage->pIfIo, pImage->pStorage,
2319 offData + pImage->cbCluster);
2320 }
2321
2322 if (RT_SUCCESS(rc))
2323 rc = vdIfIoIntFileWriteSync(pImage->pIfIo, pImage->pStorage,
2324 pImage->offBackingFilename,
2325 pImage->pszBackingFilename,
2326 strlen(pImage->pszBackingFilename));
2327 }
2328 }
2329 }
2330 else
2331 rc = VERR_VD_NOT_OPENED;
2332
2333 LogFlowFunc(("returns %Rrc\n", rc));
2334 return rc;
2335}
2336
2337
2338
2339const VDIMAGEBACKEND g_QCowBackend =
2340{
2341 /* u32Version */
2342 VD_IMGBACKEND_VERSION,
2343 /* pszBackendName */
2344 "QCOW",
2345 /* uBackendCaps */
2346 VD_CAP_FILE | VD_CAP_VFS | VD_CAP_CREATE_DYNAMIC | VD_CAP_DIFF | VD_CAP_ASYNC,
2347 /* paFileExtensions */
2348 s_aQCowFileExtensions,
2349 /* paConfigInfo */
2350 NULL,
2351 /* pfnProbe */
2352 qcowProbe,
2353 /* pfnOpen */
2354 qcowOpen,
2355 /* pfnCreate */
2356 qcowCreate,
2357 /* pfnRename */
2358 qcowRename,
2359 /* pfnClose */
2360 qcowClose,
2361 /* pfnRead */
2362 qcowRead,
2363 /* pfnWrite */
2364 qcowWrite,
2365 /* pfnFlush */
2366 qcowFlush,
2367 /* pfnDiscard */
2368 NULL,
2369 /* pfnGetVersion */
2370 qcowGetVersion,
2371 /* pfnGetSectorSize */
2372 qcowGetSectorSize,
2373 /* pfnGetSize */
2374 qcowGetSize,
2375 /* pfnGetFileSize */
2376 qcowGetFileSize,
2377 /* pfnGetPCHSGeometry */
2378 qcowGetPCHSGeometry,
2379 /* pfnSetPCHSGeometry */
2380 qcowSetPCHSGeometry,
2381 /* pfnGetLCHSGeometry */
2382 qcowGetLCHSGeometry,
2383 /* pfnSetLCHSGeometry */
2384 qcowSetLCHSGeometry,
2385 /* pfnQueryRegions */
2386 NULL,
2387 /* pfnRegionListRelease */
2388 NULL,
2389 /* pfnGetImageFlags */
2390 qcowGetImageFlags,
2391 /* pfnGetOpenFlags */
2392 qcowGetOpenFlags,
2393 /* pfnSetOpenFlags */
2394 qcowSetOpenFlags,
2395 /* pfnGetComment */
2396 qcowGetComment,
2397 /* pfnSetComment */
2398 qcowSetComment,
2399 /* pfnGetUuid */
2400 qcowGetUuid,
2401 /* pfnSetUuid */
2402 qcowSetUuid,
2403 /* pfnGetModificationUuid */
2404 qcowGetModificationUuid,
2405 /* pfnSetModificationUuid */
2406 qcowSetModificationUuid,
2407 /* pfnGetParentUuid */
2408 qcowGetParentUuid,
2409 /* pfnSetParentUuid */
2410 qcowSetParentUuid,
2411 /* pfnGetParentModificationUuid */
2412 qcowGetParentModificationUuid,
2413 /* pfnSetParentModificationUuid */
2414 qcowSetParentModificationUuid,
2415 /* pfnDump */
2416 qcowDump,
2417 /* pfnGetTimestamp */
2418 NULL,
2419 /* pfnGetParentTimestamp */
2420 NULL,
2421 /* pfnSetParentTimestamp */
2422 NULL,
2423 /* pfnGetParentFilename */
2424 qcowGetParentFilename,
2425 /* pfnSetParentFilename */
2426 qcowSetParentFilename,
2427 /* pfnComposeLocation */
2428 genericFileComposeLocation,
2429 /* pfnComposeName */
2430 genericFileComposeName,
2431 /* pfnCompact */
2432 NULL,
2433 /* pfnResize */
2434 NULL,
2435 /* pfnRepair */
2436 NULL,
2437 /* pfnTraverseMetadata */
2438 NULL,
2439 /* u32VersionEnd */
2440 VD_IMGBACKEND_VERSION
2441};
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