dvm.cpp@ 41234

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1	/* $Id: dvm.cpp 40293 2012-02-29 13:27:10Z vboxsync $ */
2	/** @file
3	* IPRT Disk Volume Management API (DVM) - generic code.
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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#include <iprt/types.h>
32	#include <iprt/assert.h>
33	#include <iprt/mem.h>
34	#include <iprt/dvm.h>
35	#include <iprt/err.h>
36	#include <iprt/asm.h>
37	#include <iprt/string.h>
38	#include <iprt/list.h>
39	#include "internal/dvm.h"
40
41	/*******************************************************************************
42	* Structures and Typedefs *
43	*******************************************************************************/
44
45	/**
46	* The internal volume manager structure.
47	*/
48	typedef struct RTDVMINTERNAL
49	{
50	/** The DVM magic (RTDVM_MAGIC). */
51	uint32_t u32Magic;
52	/** The disk descriptor. */
53	RTDVMDISK DvmDisk;
54	/** Pointer to the backend operations table after a successful probe. */
55	PCRTDVMFMTOPS pDvmFmtOps;
56	/** The format specific volume manager data. */
57	RTDVMFMT hVolMgrFmt;
58	/** Flags passed on manager creation. */
59	uint32_t fFlags;
60	/** Reference counter. */
61	uint32_t volatile cRefs;
62	/** List of recognised volumes (RTDVMVOLUMEINTERNAL). */
63	RTLISTANCHOR VolumeList;
64	} RTDVMINTERNAL;
65	/** Pointer to an internal volume manager. */
66	typedef RTDVMINTERNAL *PRTDVMINTERNAL;
67
68	/**
69	* The internal volume structure.
70	*/
71	typedef struct RTDVMVOLUMEINTERNAL
72	{
73	/** The DVM volume magic (RTDVMVOLUME_MAGIC). */
74	uint32_t u32Magic;
75	/** Node for the volume list. */
76	RTLISTNODE VolumeNode;
77	/** Pointer to the owning volume manager. */
78	PRTDVMINTERNAL pVolMgr;
79	/** Format specific volume data. */
80	RTDVMVOLUMEFMT hVolFmt;
81	/** Set block status.callback */
82	PFNDVMVOLUMEQUERYBLOCKSTATUS pfnQueryBlockStatus;
83	/** Opaque user data. */
84	void *pvUser;
85	/** Reference counter. */
86	uint32_t volatile cRefs;
87	} RTDVMVOLUMEINTERNAL;
88	/** Pointer to an internal volume. */
89	typedef RTDVMVOLUMEINTERNAL *PRTDVMVOLUMEINTERNAL;
90
91	/*******************************************************************************
92	* Global variables *
93	*******************************************************************************/
94	extern RTDVMFMTOPS g_rtDvmFmtMbr;
95	extern RTDVMFMTOPS g_rtDvmFmtGpt;
96	extern RTDVMFMTOPS g_rtDvmFmtBsdLbl;
97
98	/**
99	* Supported volume formats.
100	*/
101	static PCRTDVMFMTOPS g_aDvmFmts[] =
102	{
103	&g_rtDvmFmtMbr,
104	&g_rtDvmFmtGpt,
105	&g_rtDvmFmtBsdLbl
106	};
107
108	/**
109	* Descriptions of the volume types.
110	*
111	* This is indexed by RTDVMVOLTYPE.
112	*/
113	static const char * g_apcszDvmVolTypes[] =
114	{
115	"Invalid",
116	"Unknown",
117	"NTFS",
118	"FAT16",
119	"FAT32",
120	"Linux swap",
121	"Linux native",
122	"Linux LVM",
123	"Linux SoftRaid",
124	"FreeBSD",
125	"NetBSD",
126	"OpenBSD",
127	"Mac OS X HFS or HFS+",
128	"Solaris"
129	};
130
131	/**
132	* Creates a new volume.
133	*
134	* @returns IPRT status code.
135	* @param pThis The DVM map instance.
136	* @param hVolFmt The format specific volume handle.
137	* @param phVol Where to store the generic volume handle on success.
138	*/
139	static int rtDvmVolumeCreate(PRTDVMINTERNAL pThis, RTDVMVOLUMEFMT hVolFmt,
140	PRTDVMVOLUME phVol)
141	{
142	int rc = VINF_SUCCESS;
143	PRTDVMVOLUMEINTERNAL pVol = NULL;
144
145	pVol = (PRTDVMVOLUMEINTERNAL)RTMemAllocZ(sizeof(RTDVMVOLUMEINTERNAL));
146	if (pVol)
147	{
148	pVol->u32Magic = RTDVMVOLUME_MAGIC;
149	pVol->cRefs = 0;
150	pVol->pVolMgr = pThis;
151	pVol->hVolFmt = hVolFmt;
152
153	*phVol = pVol;
154	}
155	else
156	rc = VERR_NO_MEMORY;
157
158	return rc;
159	}
160
161	/**
162	* Destroys a volume handle.
163	*
164	* @param pThis The volume to destroy.
165	*/
166	static void rtDvmVolumeDestroy(PRTDVMVOLUMEINTERNAL pThis)
167	{
168	PRTDVMINTERNAL pVolMgr = pThis->pVolMgr;
169
170	AssertPtr(pVolMgr);
171
172	/* Close the volume. */
173	pVolMgr->pDvmFmtOps->pfnVolumeClose(pThis->hVolFmt);
174
175	pThis->u32Magic = RTDVMVOLUME_MAGIC_DEAD;
176	pThis->pVolMgr = NULL;
177	pThis->hVolFmt = NIL_RTDVMVOLUMEFMT;
178	RTMemFree(pThis);
179
180	/* Release the reference of the volume manager. */
181	RTDvmRelease(pVolMgr);
182	}
183
184	RTDECL(int) RTDvmCreate(PRTDVM phVolMgr, PFNDVMREAD pfnRead,
185	PFNDVMWRITE pfnWrite, uint64_t cbDisk,
186	uint64_t cbSector, uint32_t fFlags, void *pvUser)
187	{
188	int rc = VINF_SUCCESS;
189	PRTDVMINTERNAL pThis;
190
191	AssertMsgReturn(!(fFlags & ~DVM_FLAGS_MASK),
192	("Invalid flags given %#x\n", fFlags),
193	VERR_INVALID_PARAMETER);
194
195	pThis = (PRTDVMINTERNAL)RTMemAllocZ(sizeof(RTDVMINTERNAL));
196	if (pThis)
197	{
198	pThis->u32Magic = RTDVM_MAGIC;
199	pThis->DvmDisk.cbDisk = cbDisk;
200	pThis->DvmDisk.cbSector = cbSector;
201	pThis->DvmDisk.pvUser = pvUser;
202	pThis->DvmDisk.pfnRead = pfnRead;
203	pThis->DvmDisk.pfnWrite = pfnWrite;
204	pThis->pDvmFmtOps = NULL;
205	pThis->hVolMgrFmt = NIL_RTDVMFMT;
206	pThis->fFlags = fFlags;
207	pThis->cRefs = 1;
208	RTListInit(&pThis->VolumeList);
209	*phVolMgr = pThis;
210	}
211	else
212	rc = VERR_NO_MEMORY;
213
214	return rc;
215	}
216
217	RTDECL(uint32_t) RTDvmRetain(RTDVM hVolMgr)
218	{
219	PRTDVMINTERNAL pThis = hVolMgr;
220	AssertPtrReturn(pThis, UINT32_MAX);
221	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, UINT32_MAX);
222
223	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
224	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
225	return cRefs;
226	}
227
228	/**
229	* Destroys a volume manager handle.
230	*
231	* @param pThis The volume manager to destroy.
232	*/
233	static void rtDvmDestroy(PRTDVMINTERNAL pThis)
234	{
235	if (pThis->hVolMgrFmt != NIL_RTDVMFMT)
236	{
237	AssertPtr(pThis->pDvmFmtOps);
238
239	/* Let the backend do it's own cleanup first. */
240	pThis->pDvmFmtOps->pfnClose(pThis->hVolMgrFmt);
241	pThis->hVolMgrFmt = NIL_RTDVMFMT;
242	}
243
244	pThis->DvmDisk.cbDisk = 0;
245	pThis->DvmDisk.pvUser = NULL;
246	pThis->DvmDisk.pfnRead = NULL;
247	pThis->DvmDisk.pfnWrite = NULL;
248	pThis->u32Magic = RTDVM_MAGIC_DEAD;
249	RTMemFree(pThis);
250	}
251
252	RTDECL(uint32_t) RTDvmRelease(RTDVM hVolMgr)
253	{
254	PRTDVMINTERNAL pThis = hVolMgr;
255	if (pThis == NIL_RTDVM)
256	return 0;
257	AssertPtrReturn(pThis, UINT32_MAX);
258	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, UINT32_MAX);
259
260	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
261	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
262	if (cRefs == 0)
263	rtDvmDestroy(pThis);
264	return cRefs;
265	}
266
267	RTDECL(int) RTDvmMapOpen(RTDVM hVolMgr)
268	{
269	int rc = VINF_SUCCESS;
270	uint32_t uScoreMax = RTDVM_MATCH_SCORE_UNSUPPORTED;
271	PCRTDVMFMTOPS pDvmFmtOpsMatch = NULL;
272	PRTDVMINTERNAL pThis = hVolMgr;
273	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
274	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, VERR_INVALID_HANDLE);
275	AssertReturn(pThis->hVolMgrFmt == NIL_RTDVMFMT, VERR_INVALID_HANDLE);
276
277	Assert(!pThis->pDvmFmtOps);
278
279	for (unsigned i = 0; i < RT_ELEMENTS(g_aDvmFmts); i++)
280	{
281	uint32_t uScore;
282	PCRTDVMFMTOPS pDvmFmtOps = g_aDvmFmts[i];
283
284	rc = pDvmFmtOps->pfnProbe(&pThis->DvmDisk, &uScore);
285	if ( RT_SUCCESS(rc)
286	&& uScore > uScoreMax)
287	{
288	pDvmFmtOpsMatch = pDvmFmtOps;
289	uScoreMax = uScore;
290	}
291	else if (RT_FAILURE(rc))
292	break;
293	}
294
295	if (RT_SUCCESS(rc))
296	{
297	if (uScoreMax > RTDVM_MATCH_SCORE_UNSUPPORTED)
298	{
299	AssertPtr(pDvmFmtOpsMatch);
300
301	/* Open the format. */
302	rc = pDvmFmtOpsMatch->pfnOpen(&pThis->DvmDisk, &pThis->hVolMgrFmt);
303	if (RT_SUCCESS(rc))
304	{
305	uint32_t cVols;
306
307	pThis->pDvmFmtOps = pDvmFmtOpsMatch;
308
309	cVols = pThis->pDvmFmtOps->pfnGetValidVolumes(pThis->hVolMgrFmt);
310
311	/* Construct volume list. */
312	if (cVols)
313	{
314	PRTDVMVOLUMEINTERNAL pVol = NULL;
315	RTDVMVOLUMEFMT hVolFmt = NIL_RTDVMVOLUMEFMT;
316
317	rc = pThis->pDvmFmtOps->pfnQueryFirstVolume(pThis->hVolMgrFmt, &hVolFmt);
318	if (RT_SUCCESS(rc))
319	{
320	rc = rtDvmVolumeCreate(pThis, hVolFmt, &pVol);
321	if (RT_FAILURE(rc))
322	pThis->pDvmFmtOps->pfnVolumeClose(hVolFmt);
323	}
324
325	if (RT_SUCCESS(rc))
326	{
327	cVols--;
328	RTListAppend(&pThis->VolumeList, &pVol->VolumeNode);
329
330	while ( cVols > 0
331	&& RT_SUCCESS(rc))
332	{
333	rc = pThis->pDvmFmtOps->pfnQueryNextVolume(pThis->hVolMgrFmt, pVol->hVolFmt, &hVolFmt);
334	if (RT_SUCCESS(rc))
335	{
336	rc = rtDvmVolumeCreate(pThis, hVolFmt, &pVol);
337	if (RT_FAILURE(rc))
338	pThis->pDvmFmtOps->pfnVolumeClose(hVolFmt);
339	else
340	RTListAppend(&pThis->VolumeList, &pVol->VolumeNode);
341	cVols--;
342	}
343	}
344	}
345
346	if (RT_FAILURE(rc))
347	{
348	PRTDVMVOLUMEINTERNAL pItNext, pIt;
349
350	/* Remove all entries. */
351	RTListForEachSafe(&pThis->VolumeList, pIt, pItNext, RTDVMVOLUMEINTERNAL, VolumeNode)
352	{
353	RTListNodeRemove(&pIt->VolumeNode);
354	rtDvmVolumeDestroy(pIt);
355	}
356	}
357	}
358	}
359	}
360	else
361	rc = VERR_NOT_SUPPORTED;
362	}
363
364	return rc;
365	}
366
367	RTDECL(int) RTDvmMapInitialize(RTDVM hVolMgr, const char *pszFmt)
368	{
369	int rc = VERR_NOT_SUPPORTED;
370	PRTDVMINTERNAL pThis = hVolMgr;
371	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
372	AssertPtrReturn(pszFmt, VERR_INVALID_POINTER);
373	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, VERR_INVALID_HANDLE);
374	AssertReturn(pThis->hVolMgrFmt == NIL_RTDVMFMT, VERR_INVALID_HANDLE);
375
376	for (unsigned i = 0; i < RT_ELEMENTS(g_aDvmFmts); i++)
377	{
378	PCRTDVMFMTOPS pDvmFmtOps = g_aDvmFmts[i];
379
380	if (!RTStrCmp(pDvmFmtOps->pcszFmt, pszFmt))
381	{
382	rc = pDvmFmtOps->pfnInitialize(&pThis->DvmDisk, &pThis->hVolMgrFmt);
383	if (RT_SUCCESS(rc))
384	pThis->pDvmFmtOps = pDvmFmtOps;
385
386	break;
387	}
388	}
389
390	return rc;
391	}
392
393	RTDECL(const char *) RTDvmMapGetFormat(RTDVM hVolMgr)
394	{
395	PRTDVMINTERNAL pThis = hVolMgr;
396	AssertPtrReturn(pThis, NULL);
397	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, NULL);
398	AssertReturn(pThis->hVolMgrFmt != NIL_RTDVMFMT, NULL);
399
400	return pThis->pDvmFmtOps->pcszFmt;
401	}
402
403	RTDECL(uint32_t) RTDvmMapGetValidVolumes(RTDVM hVolMgr)
404	{
405	PRTDVMINTERNAL pThis = hVolMgr;
406	AssertPtrReturn(pThis, UINT32_MAX);
407	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, UINT32_MAX);
408	AssertReturn(pThis->hVolMgrFmt != NIL_RTDVMFMT, UINT32_MAX);
409
410	return pThis->pDvmFmtOps->pfnGetValidVolumes(pThis->hVolMgrFmt);
411	}
412
413	RTDECL(uint32_t) RTDvmMapGetMaxVolumes(RTDVM hVolMgr)
414	{
415	PRTDVMINTERNAL pThis = hVolMgr;
416	AssertPtrReturn(pThis, UINT32_MAX);
417	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, UINT32_MAX);
418	AssertReturn(pThis->hVolMgrFmt != NIL_RTDVMFMT, UINT32_MAX);
419
420	return pThis->pDvmFmtOps->pfnGetMaxVolumes(pThis->hVolMgrFmt);
421	}
422
423	RTDECL(int) RTDvmMapQueryFirstVolume(RTDVM hVolMgr, PRTDVMVOLUME phVol)
424	{
425	int rc = VERR_DVM_MAP_EMPTY;
426	PRTDVMINTERNAL pThis = hVolMgr;
427	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
428	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, VERR_INVALID_HANDLE);
429	AssertReturn(pThis->hVolMgrFmt != NIL_RTDVMFMT, VERR_INVALID_HANDLE);
430	AssertPtrReturn(phVol, VERR_INVALID_POINTER);
431
432	PRTDVMVOLUMEINTERNAL pVol = RTListGetFirst(&pThis->VolumeList, RTDVMVOLUMEINTERNAL, VolumeNode);
433	if (pVol)
434	{
435	rc = VINF_SUCCESS;
436	RTDvmVolumeRetain(pVol);
437	*phVol = pVol;
438	}
439
440	return rc;
441	}
442
443	RTDECL(int) RTDvmMapQueryNextVolume(RTDVM hVolMgr, RTDVMVOLUME hVol, PRTDVMVOLUME phVolNext)
444	{
445	int rc = VERR_DVM_MAP_NO_VOLUME;
446	PRTDVMINTERNAL pThis = hVolMgr;
447	PRTDVMVOLUMEINTERNAL pVol = hVol;
448	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
449	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, VERR_INVALID_HANDLE);
450	AssertReturn(pThis->hVolMgrFmt != NIL_RTDVMFMT, VERR_INVALID_HANDLE);
451	AssertPtrReturn(pVol, VERR_INVALID_HANDLE);
452	AssertReturn(pVol->u32Magic == RTDVMVOLUME_MAGIC, VERR_INVALID_HANDLE);
453	AssertPtrReturn(phVolNext, VERR_INVALID_POINTER);
454
455	PRTDVMVOLUMEINTERNAL pVolNext = RTListGetNext(&pThis->VolumeList, pVol,
456	RTDVMVOLUMEINTERNAL, VolumeNode);
457	if (pVolNext)
458	{
459	rc = VINF_SUCCESS;
460	RTDvmVolumeRetain(pVolNext);
461	*phVolNext = pVolNext;
462	}
463
464	return rc;
465	}
466
467	RTDECL(int) RTDvmMapQueryBlockStatus(RTDVM hVolMgr, uint64_t off, uint64_t cb,
468	bool *pfAllocated)
469	{
470	int rc = VINF_SUCCESS;
471	bool fAllocated = false;
472	PRTDVMINTERNAL pThis = hVolMgr;
473	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
474	AssertPtrReturn(pfAllocated, VERR_INVALID_POINTER);
475	AssertReturn(pThis->u32Magic == RTDVM_MAGIC, VERR_INVALID_HANDLE);
476	AssertReturn(pThis->hVolMgrFmt != NIL_RTDVMFMT, VERR_INVALID_HANDLE);
477	AssertReturn(off + cb <= pThis->DvmDisk.cbDisk * pThis->DvmDisk.cbSector,
478	VERR_INVALID_PARAMETER);
479
480	while ( cb > 0
481	&& !fAllocated)
482	{
483	PRTDVMVOLUMEINTERNAL pVol;
484	bool fVolFound = false;
485	uint64_t cbIntersect;
486	uint64_t offVol;
487
488	/*
489	* Search through all volumes. It is not possible to
490	* get all start sectors and sizes of all volumes here
491	* because volumes can be scattered around the disk for certain formats.
492	* Linux LVM is one example, extents of logical volumes don't need to be
493	* contigous on the medium.
494	*/
495	RTListForEach(&pThis->VolumeList, pVol, RTDVMVOLUMEINTERNAL, VolumeNode)
496	{
497	bool fIntersect = pThis->pDvmFmtOps->pfnVolumeIsRangeIntersecting(pVol->hVolFmt, off,
498	cb, &offVol,
499	&cbIntersect);
500	if (fIntersect)
501	{
502	fVolFound = true;
503	if (pVol->pfnQueryBlockStatus)
504	{
505	bool fVolAllocated = true;
506
507	rc = pVol->pfnQueryBlockStatus(pVol->pvUser, offVol, cbIntersect,
508	&fVolAllocated);
509	if (RT_FAILURE(rc))
510	break;
511	}
512	else if (!(pThis->fFlags & DVM_FLAGS_NO_STATUS_CALLBACK_MARK_AS_UNUSED))
513	fAllocated = true;
514	/* else, flag is set, continue. */
515
516	cb -= cbIntersect;
517	off += cbIntersect;
518	break;
519	}
520	}
521
522	if (!fVolFound)
523	{
524	if (pThis->fFlags & DVM_FLAGS_UNUSED_SPACE_MARK_AS_USED)
525	fAllocated = true;
526
527	cb -= pThis->DvmDisk.cbSector;
528	off += pThis->DvmDisk.cbSector;
529	}
530	}
531
532	*pfAllocated = fAllocated;
533
534	return rc;
535	}
536
537	RTDECL(uint32_t) RTDvmVolumeRetain(RTDVMVOLUME hVol)
538	{
539	PRTDVMVOLUMEINTERNAL pThis = hVol;
540	AssertPtrReturn(pThis, UINT32_MAX);
541	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, UINT32_MAX);
542
543	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
544	AssertMsg(cRefs >= 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
545	if (cRefs == 1)
546	RTDvmRetain(pThis->pVolMgr);
547	return cRefs;
548	}
549
550	RTDECL(uint32_t) RTDvmVolumeRelease(RTDVMVOLUME hVol)
551	{
552	PRTDVMVOLUMEINTERNAL pThis = hVol;
553	if (pThis == NIL_RTDVMVOLUME)
554	return 0;
555	AssertPtrReturn(pThis, UINT32_MAX);
556	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, UINT32_MAX);
557
558	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
559	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
560	if (cRefs == 0)
561	{
562	/* Release the volume manager. */
563	pThis->pfnQueryBlockStatus = NULL;
564	RTDvmRelease(pThis->pVolMgr);
565	}
566	return cRefs;
567	}
568
569	RTDECL(void) RTDvmVolumeSetQueryBlockStatusCallback(RTDVMVOLUME hVol,
570	PFNDVMVOLUMEQUERYBLOCKSTATUS pfnQueryBlockStatus,
571	void *pvUser)
572	{
573	PRTDVMVOLUMEINTERNAL pThis = hVol;
574	AssertPtrReturnVoid(pThis);
575	AssertReturnVoid(pThis->u32Magic == RTDVMVOLUME_MAGIC);
576
577	pThis->pfnQueryBlockStatus = pfnQueryBlockStatus;
578	pThis->pvUser = pvUser;
579	}
580
581	RTDECL(uint64_t) RTDvmVolumeGetSize(RTDVMVOLUME hVol)
582	{
583	PRTDVMVOLUMEINTERNAL pThis = hVol;
584	AssertPtrReturn(pThis, 0);
585	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, 0);
586
587	return pThis->pVolMgr->pDvmFmtOps->pfnVolumeGetSize(pThis->hVolFmt);
588	}
589
590	RTDECL(int) RTDvmVolumeQueryName(RTDVMVOLUME hVol, char **ppszVolName)
591	{
592	PRTDVMVOLUMEINTERNAL pThis = hVol;
593	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
594	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, VERR_INVALID_HANDLE);
595	AssertReturn(ppszVolName, VERR_INVALID_POINTER);
596
597	return pThis->pVolMgr->pDvmFmtOps->pfnVolumeQueryName(pThis->hVolFmt, ppszVolName);
598	}
599
600	RTDECL(RTDVMVOLTYPE) RTDvmVolumeGetType(RTDVMVOLUME hVol)
601	{
602	PRTDVMVOLUMEINTERNAL pThis = hVol;
603	AssertPtrReturn(pThis, RTDVMVOLTYPE_INVALID);
604	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, RTDVMVOLTYPE_INVALID);
605
606	return pThis->pVolMgr->pDvmFmtOps->pfnVolumeGetType(pThis->hVolFmt);
607	}
608
609	RTDECL(uint64_t) RTDvmVolumeGetFlags(RTDVMVOLUME hVol)
610	{
611	PRTDVMVOLUMEINTERNAL pThis = hVol;
612	AssertPtrReturn(pThis, UINT64_MAX);
613	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, UINT64_MAX);
614
615	return pThis->pVolMgr->pDvmFmtOps->pfnVolumeGetFlags(pThis->hVolFmt);
616	}
617
618	RTDECL(int) RTDvmVolumeRead(RTDVMVOLUME hVol, uint64_t off, void *pvBuf, size_t cbRead)
619	{
620	PRTDVMVOLUMEINTERNAL pThis = hVol;
621	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
622	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, VERR_INVALID_HANDLE);
623	AssertReturn(pvBuf, VERR_INVALID_POINTER);
624	AssertReturn(cbRead > 0, VERR_INVALID_PARAMETER);
625
626	return pThis->pVolMgr->pDvmFmtOps->pfnVolumeRead(pThis->hVolFmt, off, pvBuf, cbRead);
627	}
628
629	RTDECL(int) RTDvmVolumeWrite(RTDVMVOLUME hVol, uint64_t off, const void *pvBuf, size_t cbWrite)
630	{
631	PRTDVMVOLUMEINTERNAL pThis = hVol;
632	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
633	AssertReturn(pThis->u32Magic == RTDVMVOLUME_MAGIC, VERR_INVALID_HANDLE);
634	AssertReturn(pvBuf, VERR_INVALID_POINTER);
635	AssertReturn(cbWrite > 0, VERR_INVALID_PARAMETER);
636
637	return pThis->pVolMgr->pDvmFmtOps->pfnVolumeWrite(pThis->hVolFmt, off, pvBuf, cbWrite);
638	}
639
640	RTDECL(const char *) RTDvmVolumeTypeGetDescr(RTDVMVOLTYPE enmVolType)
641	{
642	AssertReturn(enmVolType >= RTDVMVOLTYPE_INVALID && enmVolType < RTDVMVOLTYPE_END, NULL);
643
644	return g_apcszDvmVolTypes[enmVolType];
645	}

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source: vbox/trunk/src/VBox/Runtime/common/dvm/dvm.cpp@ 41234

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