dvmmbr.cpp@ 76553

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1	/* $Id: dvmmbr.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT Disk Volume Management API (DVM) - MBR format backend.
4	*/
5
6	/*
7	* Copyright (C) 2011-2019 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	#define LOG_GROUP RTLOGGROUP_FS
32	#include <iprt/types.h>
33	#include <iprt/assert.h>
34	#include <iprt/mem.h>
35	#include <iprt/dvm.h>
36	#include <iprt/list.h>
37	#include <iprt/log.h>
38	#include <iprt/string.h>
39	#include "internal/dvm.h"
40
41
42	/*********************************************************************************************************************************
43	* Defined Constants And Macros *
44	*********************************************************************************************************************************/
45	/** Checks if the partition type is an extended partition container. */
46	#define RTDVMMBR_IS_EXTENDED(a_bType) ((a_bType) == 0x05 \|\| (a_bType) == 0x0f)
47
48
49	/*********************************************************************************************************************************
50	* Structures and Typedefs *
51	*********************************************************************************************************************************/
52	/** Pointer to a MBR sector. */
53	typedef struct RTDVMMBRSECTOR *PRTDVMMBRSECTOR;
54
55	/**
56	* MBR entry.
57	*/
58	typedef struct RTDVMMBRENTRY
59	{
60	/** Our entry in the in-use partition entry list (RTDVMMBRENTRY). */
61	RTLISTNODE ListEntry;
62	/** Pointer to the MBR sector containing this entry. */
63	PRTDVMMBRSECTOR pSector;
64	/** Pointer to the next sector in the extended partition table chain. */
65	PRTDVMMBRSECTOR pChain;
66	/** The byte offset of the start of the partition (relative to disk). */
67	uint64_t offPart;
68	/** Number of bytes for this partition. */
69	uint64_t cbPart;
70	/** The partition/filesystem type. */
71	uint8_t bType;
72	/** The partition flags. */
73	uint8_t fFlags;
74	/** Bad entry. */
75	bool fBad;
76	} RTDVMMBRENTRY;
77	/** Pointer to an MBR entry. */
78	typedef RTDVMMBRENTRY *PRTDVMMBRENTRY;
79
80	/**
81	* A MBR sector.
82	*/
83	typedef struct RTDVMMBRSECTOR
84	{
85	/** Internal representation of the entries. */
86	RTDVMMBRENTRY aEntries[4];
87	/** The byte offset of this MBR sector (relative to disk).
88	* We keep this for detecting cycles now, but it will be needed if we start
89	* updating the partition table at some point. */
90	uint64_t offOnDisk;
91	/** Pointer to the previous sector if this isn't a primary one. */
92	PRTDVMMBRENTRY pPrevSector;
93	/** Set if this is the primary MBR, cleared if an extended. */
94	bool fIsPrimary;
95	/** Number of used entries. */
96	uint8_t cUsed;
97	/** Number of extended entries. */
98	uint8_t cExtended;
99	/** The extended entry we're following (we only follow one, except when
100	* fIsPrimary is @c true). UINT8_MAX if none. */
101	uint8_t idxExtended;
102	/** The raw data. */
103	uint8_t abData[512];
104	} RTDVMMBRSECTOR;
105
106	/**
107	* MBR volume manager data.
108	*/
109	typedef struct RTDVMFMTINTERNAL
110	{
111	/** Pointer to the underlying disk. */
112	PCRTDVMDISK pDisk;
113	/** Head of the list of in-use RTDVMMBRENTRY structures. This excludes
114	* extended partition table entries. */
115	RTLISTANCHOR PartitionHead;
116	/** The total number of partitions, not counting extended ones. */
117	uint32_t cPartitions;
118	/** The actual primary MBR sector. */
119	RTDVMMBRSECTOR Primary;
120	} RTDVMFMTINTERNAL;
121	/** Pointer to the MBR volume manager. */
122	typedef RTDVMFMTINTERNAL *PRTDVMFMTINTERNAL;
123
124	/**
125	* MBR volume data.
126	*/
127	typedef struct RTDVMVOLUMEFMTINTERNAL
128	{
129	/** Pointer to the volume manager. */
130	PRTDVMFMTINTERNAL pVolMgr;
131	/** The MBR entry. */
132	PRTDVMMBRENTRY pEntry;
133	} RTDVMVOLUMEFMTINTERNAL;
134	/** Pointer to an MBR volume. */
135	typedef RTDVMVOLUMEFMTINTERNAL *PRTDVMVOLUMEFMTINTERNAL;
136
137
138	/*********************************************************************************************************************************
139	* Global Variables *
140	*********************************************************************************************************************************/
141	/**
142	* Mapping of FS types to DVM volume types.
143	*
144	* @see https://en.wikipedia.org/wiki/Partition_type
145	* @see http://www.win.tue.nl/~aeb/partitions/partition_types-1.html
146	*/
147	static const struct RTDVMMBRFS2VOLTYPE
148	{
149	/** MBR FS Id. */
150	uint8_t bFsId;
151	/** DVM volume type. */
152	RTDVMVOLTYPE enmVolType;
153	} g_aFs2DvmVolTypes[] =
154	{
155	{ 0x01, RTDVMVOLTYPE_FAT12 },
156	{ 0x04, RTDVMVOLTYPE_FAT16 },
157	{ 0x06, RTDVMVOLTYPE_FAT16 }, /* big FAT16 */
158	{ 0x07, RTDVMVOLTYPE_NTFS }, /* Simplification: Used for HPFS, exFAT, ++, too but NTFS is the more common one. */
159	{ 0x0b, RTDVMVOLTYPE_FAT32 },
160	{ 0x0c, RTDVMVOLTYPE_FAT32 },
161	{ 0x0e, RTDVMVOLTYPE_FAT16 },
162
163	/* Hidden variants of the above: */
164	{ 0x11, RTDVMVOLTYPE_FAT12 },
165	{ 0x14, RTDVMVOLTYPE_FAT16 },
166	{ 0x16, RTDVMVOLTYPE_FAT16 },
167	{ 0x17, RTDVMVOLTYPE_NTFS },
168	{ 0x1b, RTDVMVOLTYPE_FAT32 },
169	{ 0x1c, RTDVMVOLTYPE_FAT32 },
170	{ 0x1e, RTDVMVOLTYPE_FAT16 },
171
172	{ 0x82, RTDVMVOLTYPE_LINUX_SWAP },
173	{ 0x83, RTDVMVOLTYPE_LINUX_NATIVE },
174	{ 0x8e, RTDVMVOLTYPE_LINUX_LVM },
175	{ 0xa5, RTDVMVOLTYPE_FREEBSD },
176	{ 0xa9, RTDVMVOLTYPE_NETBSD },
177	{ 0xa6, RTDVMVOLTYPE_OPENBSD },
178	{ 0xaf, RTDVMVOLTYPE_DARWIN_HFS },
179	{ 0xbf, RTDVMVOLTYPE_SOLARIS },
180	{ 0xfd, RTDVMVOLTYPE_LINUX_SOFTRAID }
181	};
182
183	static DECLCALLBACK(int) rtDvmFmtMbrProbe(PCRTDVMDISK pDisk, uint32_t *puScore)
184	{
185	int rc = VINF_SUCCESS;
186	*puScore = RTDVM_MATCH_SCORE_UNSUPPORTED;
187	if (pDisk->cbDisk >= 512)
188	{
189	/* Read from the disk and check for the 0x55aa signature at the end. */
190	uint8_t abMbr[512];
191	rc = rtDvmDiskRead(pDisk, 0, &abMbr[0], sizeof(abMbr));
192	if ( RT_SUCCESS(rc)
193	&& abMbr[510] == 0x55
194	&& abMbr[511] == 0xaa)
195	puScore = RTDVM_MATCH_SCORE_SUPPORTED; / Not perfect because GPTs have a protective MBR. */
196	}
197
198	return rc;
199	}
200
201
202	static void rtDvmFmtMbrDestroy(PRTDVMFMTINTERNAL pThis)
203	{
204	/*
205	* Delete chains of extended partitions.
206	*/
207	for (unsigned i = 0; i < 4; i++)
208	{
209	PRTDVMMBRSECTOR pCur = pThis->Primary.aEntries[i].pChain;
210	while (pCur)
211	{
212	PRTDVMMBRSECTOR pNext = pCur->idxExtended != UINT8_MAX ? pCur->aEntries[pCur->idxExtended].pChain : NULL;
213
214	RT_ZERO(pCur->aEntries);
215	pCur->pPrevSector = NULL;
216	RTMemFree(pCur);
217
218	pCur = pNext;
219	}
220	}
221
222	/*
223	* Now kill this.
224	*/
225	pThis->pDisk = NULL;
226	RT_ZERO(pThis->Primary.aEntries);
227	RTMemFree(pThis);
228	}
229
230
231	static int rtDvmFmtMbrReadExtended(PRTDVMFMTINTERNAL pThis, PRTDVMMBRENTRY pPrimaryEntry)
232	{
233	uint64_t const cbExt = pPrimaryEntry->cbPart;
234	uint64_t const offExtBegin = pPrimaryEntry->offPart;
235
236	uint64_t offCurBegin = offExtBegin;
237	PRTDVMMBRENTRY pCurEntry = pPrimaryEntry;
238	for (unsigned cTables = 1; ; cTables++)
239	{
240	/*
241	* Do some sanity checking.
242	*/
243	/* Check the address of the partition table. */
244	if (offCurBegin - offExtBegin >= cbExt)
245	{
246	LogRel(("rtDvmFmtMbrReadExtended: offCurBegin=%#RX64 is outside the extended partition: %#RX64..%#RX64 (LB %#RX64)\n",
247	offCurBegin, offExtBegin, offExtBegin + cbExt - 1, cbExt));
248	pCurEntry->fBad = true;
249	return -VERR_OUT_OF_RANGE;
250	}
251
252	/* Limit the chain length. */
253	if (cTables > 64)
254	{
255	LogRel(("rtDvmFmtMbrReadExtended: offCurBegin=%#RX64 is the %uth table, we stop here.\n", offCurBegin, cTables));
256	pCurEntry->fBad = true;
257	return -VERR_TOO_MANY_SYMLINKS;
258	}
259
260	/* Check for obvious cycles. */
261	for (PRTDVMMBRENTRY pPrev = pCurEntry->pSector->pPrevSector; pPrev != NULL; pPrev = pPrev->pSector->pPrevSector)
262	if (pPrev->offPart == offCurBegin)
263	{
264	LogRel(("rtDvmFmtMbrReadExtended: Cycle! We've seen offCurBegin=%#RX64 before\n", offCurBegin));
265	pCurEntry->fBad = true;
266	return -VERR_TOO_MANY_SYMLINKS;
267	}
268
269	/*
270	* Allocate a new sector entry and read the sector with the table.
271	*/
272	PRTDVMMBRSECTOR pNext = (PRTDVMMBRSECTOR)RTMemAllocZ(sizeof(*pNext));
273	if (!pNext)
274	return VERR_NO_MEMORY;
275	pNext->offOnDisk = offCurBegin;
276	pNext->pPrevSector = pCurEntry;
277	//pNext->fIsPrimary = false;
278	//pNext->cUsed = 0;
279	//pNext->cExtended = 0;
280	pNext->idxExtended = UINT8_MAX;
281
282	int rc = rtDvmDiskRead(pThis->pDisk, pNext->offOnDisk, &pNext->abData[0], sizeof(pNext->abData));
283	if ( RT_FAILURE(rc)
284	\|\| pNext->abData[510] != 0x55
285	\|\| pNext->abData[511] != 0xaa)
286	{
287	if (RT_FAILURE(rc))
288	LogRel(("rtDvmFmtMbrReadExtended: Error reading extended partition table at sector %#RX64: %Rrc\n", offCurBegin, rc));
289	else
290	LogRel(("rtDvmFmtMbrReadExtended: Extended partition table at sector %#RX64 does not have a valid DOS signature: %#x %#x\n",
291	offCurBegin, pNext->abData[510], pNext->abData[511]));
292	RTMemFree(pNext);
293	pCurEntry->fBad = true;
294	return rc;
295	}
296	pCurEntry->pChain = pNext;
297
298	/*
299	* Process the table, taking down the first forward entry.
300	*
301	* As noted in the caller of this function, we only deal with one extended
302	* partition entry at this level since noone really ever put more than one
303	* here anyway.
304	*/
305	PRTDVMMBRENTRY pEntry = &pNext->aEntries[0];
306	uint8_t *pbMbrEntry = &pNext->abData[446];
307	for (unsigned i = 0; i < 4; i++, pEntry++, pbMbrEntry += 16)
308	{
309	uint8_t const bType = pbMbrEntry[4];
310	pEntry->pSector = pNext;
311	RTListInit(&pEntry->ListEntry);
312	if (bType != 0)
313	{
314	pEntry->bType = bType;
315	pEntry->fFlags = pbMbrEntry[0];
316	pEntry->offPart = RT_MAKE_U32_FROM_U8(pbMbrEntry[0x08],
317	pbMbrEntry[0x08 + 1],
318	pbMbrEntry[0x08 + 2],
319	pbMbrEntry[0x08 + 3]);
320	pEntry->offPart *= 512;
321	pEntry->cbPart = RT_MAKE_U32_FROM_U8(pbMbrEntry[0x0c],
322	pbMbrEntry[0x0c + 1],
323	pbMbrEntry[0x0c + 2],
324	pbMbrEntry[0x0c + 3]);
325	pEntry->cbPart *= 512;
326	if (!RTDVMMBR_IS_EXTENDED(bType))
327	{
328	pEntry->offPart += offCurBegin;
329	pThis->cPartitions++;
330	RTListAppend(&pThis->PartitionHead, &pEntry->ListEntry);
331	Log2(("rtDvmFmtMbrReadExtended: %#012RX64::%u: vol%u bType=%#04x fFlags=%#04x offPart=%#012RX64 cbPart=%#012RX64\n",
332	offCurBegin, i, pThis->cPartitions - 1, pEntry->bType, pEntry->fFlags, pEntry->offPart, pEntry->cbPart));
333	}
334	else
335	{
336	pEntry->offPart += offExtBegin;
337	pNext->cExtended++;
338	if (pNext->idxExtended == UINT8_MAX)
339	pNext->idxExtended = (uint8_t)i;
340	else
341	{
342	pEntry->fBad = true;
343	LogRel(("rtDvmFmtMbrReadExtended: Warning! Both #%u and #%u are extended partition table entries! Only following the former\n",
344	i, pNext->idxExtended));
345	}
346	Log2(("rtDvmFmtMbrReadExtended: %#012RX64::%u: ext%u bType=%#04x fFlags=%#04x offPart=%#012RX64 cbPart=%#012RX64\n",
347	offCurBegin, i, pNext->cExtended - 1, pEntry->bType, pEntry->fFlags, pEntry->offPart, pEntry->cbPart));
348	}
349	pNext->cUsed++;
350
351	}
352	/* else: unused */
353	}
354
355	/*
356	* We're done if we didn't find any extended partition table entry.
357	* Otherwise, advance to the next one.
358	*/
359	if (!pNext->cExtended)
360	return VINF_SUCCESS;
361	pCurEntry = &pNext->aEntries[pNext->idxExtended];
362	offCurBegin = pCurEntry->offPart;
363	}
364	}
365
366
367	static DECLCALLBACK(int) rtDvmFmtMbrOpen(PCRTDVMDISK pDisk, PRTDVMFMT phVolMgrFmt)
368	{
369	int rc;
370	PRTDVMFMTINTERNAL pThis = (PRTDVMFMTINTERNAL)RTMemAllocZ(sizeof(RTDVMFMTINTERNAL));
371	if (pThis)
372	{
373	pThis->pDisk = pDisk;
374	//pThis->cPartitions = 0;
375	RTListInit(&pThis->PartitionHead);
376	//pThis->Primary.offOnDisk = 0;
377	//pThis->Primary.pPrevSector = NULL;
378	pThis->Primary.fIsPrimary = true;
379	//pThis->Primary.cUsed = 0;
380	//pThis->Primary.cExtended = 0;
381	pThis->Primary.idxExtended = UINT8_MAX;
382
383	/*
384	* Read the primary MBR.
385	*/
386	rc = rtDvmDiskRead(pDisk, 0, &pThis->Primary.abData[0], sizeof(pThis->Primary.abData));
387	if (RT_SUCCESS(rc))
388	{
389	Assert(pThis->Primary.abData[510] == 0x55 && pThis->Primary.abData[511] == 0xaa);
390
391	/*
392	* Setup basic data for the 4 entries.
393	*/
394	PRTDVMMBRENTRY pEntry = &pThis->Primary.aEntries[0];
395	uint8_t *pbMbrEntry = &pThis->Primary.abData[446];
396	for (unsigned i = 0; i < 4; i++, pEntry++, pbMbrEntry += 16)
397	{
398	pEntry->pSector = &pThis->Primary;
399	RTListInit(&pEntry->ListEntry);
400
401	uint8_t const bType = pbMbrEntry[4];
402	if (bType != 0)
403	{
404	pEntry->offPart = RT_MAKE_U32_FROM_U8(pbMbrEntry[0x08 + 0],
405	pbMbrEntry[0x08 + 1],
406	pbMbrEntry[0x08 + 2],
407	pbMbrEntry[0x08 + 3]);
408	pEntry->offPart *= 512;
409	pEntry->cbPart = RT_MAKE_U32_FROM_U8(pbMbrEntry[0x0c + 0],
410	pbMbrEntry[0x0c + 1],
411	pbMbrEntry[0x0c + 2],
412	pbMbrEntry[0x0c + 3]);
413	pEntry->cbPart *= 512;
414	pEntry->bType = bType;
415	pEntry->fFlags = pbMbrEntry[0];
416	if (!RTDVMMBR_IS_EXTENDED(bType))
417	{
418	pThis->cPartitions++;
419	RTListAppend(&pThis->PartitionHead, &pEntry->ListEntry);
420	Log2(("rtDvmFmtMbrOpen: %u: vol%u bType=%#04x fFlags=%#04x offPart=%#012RX64 cbPart=%#012RX64\n",
421	i, pThis->cPartitions - 1, pEntry->bType, pEntry->fFlags, pEntry->offPart, pEntry->cbPart));
422	}
423	else
424	{
425	pThis->Primary.cExtended++;
426	Log2(("rtDvmFmtMbrOpen: %u: ext%u bType=%#04x fFlags=%#04x offPart=%#012RX64 cbPart=%#012RX64\n",
427	i, pThis->Primary.cExtended - 1, pEntry->bType, pEntry->fFlags, pEntry->offPart, pEntry->cbPart));
428	}
429	pThis->Primary.cUsed++;
430	}
431	/* else: unused */
432	}
433
434	/*
435	* Now read any extended partitions. Since it's no big deal for us, we allow
436	* the primary partition table to have more than one extended partition. However
437	* in the extended tables we only allow a single forward link to avoid having to
438	* deal with recursion.
439	*/
440	if (pThis->Primary.cExtended > 0)
441	for (unsigned i = 0; i < 4; i++)
442	if (RTDVMMBR_IS_EXTENDED(pThis->Primary.aEntries[i].bType))
443	{
444	if (pThis->Primary.idxExtended == UINT8_MAX)
445	pThis->Primary.idxExtended = (uint8_t)i;
446	rc = rtDvmFmtMbrReadExtended(pThis, &pThis->Primary.aEntries[i]);
447	if (RT_FAILURE(rc))
448	break;
449	}
450	if (RT_SUCCESS(rc))
451	{
452	*phVolMgrFmt = pThis;
453	return rc;
454	}
455
456	}
457	}
458	else
459	rc = VERR_NO_MEMORY;
460
461	return rc;
462	}
463
464	static DECLCALLBACK(int) rtDvmFmtMbrInitialize(PCRTDVMDISK pDisk, PRTDVMFMT phVolMgrFmt)
465	{
466	int rc;
467	PRTDVMFMTINTERNAL pThis = (PRTDVMFMTINTERNAL)RTMemAllocZ(sizeof(RTDVMFMTINTERNAL));
468	if (pThis)
469	{
470	pThis->pDisk = pDisk;
471	//pThis->cPartitions = 0;
472	RTListInit(&pThis->PartitionHead);
473	//pThis->Primary.offOnDisk = 0
474	//pThis->Primary.pPrevSector = NULL;
475	pThis->Primary.fIsPrimary = true;
476	//pThis->Primary.cUsed = 0;
477	//pThis->Primary.cExtended = 0;
478	pThis->Primary.idxExtended = UINT8_MAX;
479
480	/* Setup a new MBR and write it to the disk. */
481	pThis->Primary.abData[510] = 0x55;
482	pThis->Primary.abData[511] = 0xaa;
483	rc = rtDvmDiskWrite(pDisk, 0, &pThis->Primary.abData[0], sizeof(pThis->Primary.abData));
484	if (RT_SUCCESS(rc))
485	{
486	pThis->pDisk = pDisk;
487	*phVolMgrFmt = pThis;
488	}
489	else
490	RTMemFree(pThis);
491	}
492	else
493	rc = VERR_NO_MEMORY;
494
495	return rc;
496	}
497
498	static DECLCALLBACK(void) rtDvmFmtMbrClose(RTDVMFMT hVolMgrFmt)
499	{
500	rtDvmFmtMbrDestroy(hVolMgrFmt);
501	}
502
503	static DECLCALLBACK(int) rtDvmFmtMbrQueryRangeUse(RTDVMFMT hVolMgrFmt, uint64_t off, uint64_t cbRange, bool *pfUsed)
504	{
505	PRTDVMFMTINTERNAL pThis = hVolMgrFmt;
506
507	/*
508	* The MBR definitely uses the first 512 bytes, but we consider anything up
509	* to 1MB of alignment padding / cylinder gap to be considered in use too.
510	*
511	* The cylinder gap has been used by several boot managers and boot loaders
512	* to store code and data.
513	*/
514	if (off < (uint64_t)_1M)
515	{
516	*pfUsed = true;
517	return VINF_SUCCESS;
518	}
519
520	/* Ditto for any extended partition tables. */
521	for (uint32_t iPrimary = 0; iPrimary < 4; iPrimary++)
522	{
523	PRTDVMMBRSECTOR pCur = pThis->Primary.aEntries[iPrimary].pChain;
524	while (pCur)
525	{
526	if ( off < pCur->offOnDisk + _1M
527	&& off + cbRange > pCur->offOnDisk)
528	{
529	*pfUsed = true;
530	return VINF_SUCCESS;
531	}
532
533
534	if (pCur->idxExtended == UINT8_MAX)
535	break;
536	pCur = pCur->aEntries[pCur->idxExtended].pChain;
537	}
538
539	}
540
541	/* Not in use. */
542	*pfUsed = false;
543	return VINF_SUCCESS;
544	}
545
546	static DECLCALLBACK(uint32_t) rtDvmFmtMbrGetValidVolumes(RTDVMFMT hVolMgrFmt)
547	{
548	PRTDVMFMTINTERNAL pThis = hVolMgrFmt;
549
550	return pThis->cPartitions;
551	}
552
553	static DECLCALLBACK(uint32_t) rtDvmFmtMbrGetMaxVolumes(RTDVMFMT hVolMgrFmt)
554	{
555	NOREF(hVolMgrFmt);
556	return 4; /** @todo Add support for EBR? */
557	}
558
559	/**
560	* Creates a new volume.
561	*
562	* @returns IPRT status code.
563	* @param pThis The MBR volume manager data.
564	* @param pEntry The MBR entry to create a volume handle for.
565	* @param phVolFmt Where to store the volume data on success.
566	*/
567	static int rtDvmFmtMbrVolumeCreate(PRTDVMFMTINTERNAL pThis, PRTDVMMBRENTRY pEntry, PRTDVMVOLUMEFMT phVolFmt)
568	{
569	PRTDVMVOLUMEFMTINTERNAL pVol = (PRTDVMVOLUMEFMTINTERNAL)RTMemAllocZ(sizeof(RTDVMVOLUMEFMTINTERNAL));
570	if (pVol)
571	{
572	pVol->pVolMgr = pThis;
573	pVol->pEntry = pEntry;
574	*phVolFmt = pVol;
575	return VINF_SUCCESS;
576	}
577	return VERR_NO_MEMORY;
578	}
579
580	static DECLCALLBACK(int) rtDvmFmtMbrQueryFirstVolume(RTDVMFMT hVolMgrFmt, PRTDVMVOLUMEFMT phVolFmt)
581	{
582	PRTDVMFMTINTERNAL pThis = hVolMgrFmt;
583	if (pThis->cPartitions != 0)
584	return rtDvmFmtMbrVolumeCreate(pThis, RTListGetFirst(&pThis->PartitionHead, RTDVMMBRENTRY, ListEntry), phVolFmt);
585	return VERR_DVM_MAP_EMPTY;
586	}
587
588	static DECLCALLBACK(int) rtDvmFmtMbrQueryNextVolume(RTDVMFMT hVolMgrFmt, RTDVMVOLUMEFMT hVolFmt, PRTDVMVOLUMEFMT phVolFmtNext)
589	{
590	PRTDVMFMTINTERNAL pThis = hVolMgrFmt;
591	PRTDVMVOLUMEFMTINTERNAL pCurVol = hVolFmt;
592	if (pCurVol)
593	{
594	PRTDVMMBRENTRY pNextEntry = RTListGetNext(&pThis->PartitionHead, pCurVol->pEntry, RTDVMMBRENTRY, ListEntry);
595	if (pNextEntry)
596	return rtDvmFmtMbrVolumeCreate(pThis, pNextEntry, phVolFmtNext);
597	return VERR_DVM_MAP_NO_VOLUME;
598	}
599	if (pThis->cPartitions != 0)
600	return rtDvmFmtMbrVolumeCreate(pThis, RTListGetFirst(&pThis->PartitionHead, RTDVMMBRENTRY, ListEntry), phVolFmtNext);
601	return VERR_DVM_MAP_EMPTY;
602	}
603
604	static DECLCALLBACK(void) rtDvmFmtMbrVolumeClose(RTDVMVOLUMEFMT hVolFmt)
605	{
606	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
607
608	pVol->pVolMgr = NULL;
609	pVol->pEntry = NULL;
610
611	RTMemFree(pVol);
612	}
613
614	static DECLCALLBACK(uint64_t) rtDvmFmtMbrVolumeGetSize(RTDVMVOLUMEFMT hVolFmt)
615	{
616	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
617
618	return pVol->pEntry->cbPart;
619	}
620
621	static DECLCALLBACK(int) rtDvmFmtMbrVolumeQueryName(RTDVMVOLUMEFMT hVolFmt, char **ppszVolName)
622	{
623	NOREF(hVolFmt); NOREF(ppszVolName);
624	return VERR_NOT_SUPPORTED;
625	}
626
627	static DECLCALLBACK(RTDVMVOLTYPE) rtDvmFmtMbrVolumeGetType(RTDVMVOLUMEFMT hVolFmt)
628	{
629	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
630
631	uint8_t const bType = pVol->pEntry->bType;
632	for (unsigned i = 0; i < RT_ELEMENTS(g_aFs2DvmVolTypes); i++)
633	if (g_aFs2DvmVolTypes[i].bFsId == bType)
634	return g_aFs2DvmVolTypes[i].enmVolType;
635
636	return RTDVMVOLTYPE_UNKNOWN;
637	}
638
639	static DECLCALLBACK(uint64_t) rtDvmFmtMbrVolumeGetFlags(RTDVMVOLUMEFMT hVolFmt)
640	{
641	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
642
643	uint64_t fFlags = 0;
644	if (pVol->pEntry->bType & 0x80)
645	fFlags \|= DVMVOLUME_FLAGS_BOOTABLE \| DVMVOLUME_FLAGS_ACTIVE;
646
647	return fFlags;
648	}
649
650	static DECLCALLBACK(bool) rtDvmFmtMbrVolumeIsRangeIntersecting(RTDVMVOLUMEFMT hVolFmt, uint64_t offStart, size_t cbRange,
651	uint64_t poffVol, uint64_t pcbIntersect)
652	{
653	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
654
655	if (RTDVM_RANGE_IS_INTERSECTING(pVol->pEntry->offPart, pVol->pEntry->cbPart, offStart))
656	{
657	*poffVol = offStart - pVol->pEntry->offPart;
658	*pcbIntersect = RT_MIN(cbRange, pVol->pEntry->offPart + pVol->pEntry->cbPart - offStart);
659	return true;
660	}
661	return false;
662	}
663
664	static DECLCALLBACK(int) rtDvmFmtMbrVolumeRead(RTDVMVOLUMEFMT hVolFmt, uint64_t off, void *pvBuf, size_t cbRead)
665	{
666	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
667	AssertReturn(off + cbRead <= pVol->pEntry->cbPart, VERR_INVALID_PARAMETER);
668
669	return rtDvmDiskRead(pVol->pVolMgr->pDisk, pVol->pEntry->offPart + off, pvBuf, cbRead);
670	}
671
672	static DECLCALLBACK(int) rtDvmFmtMbrVolumeWrite(RTDVMVOLUMEFMT hVolFmt, uint64_t off, const void *pvBuf, size_t cbWrite)
673	{
674	PRTDVMVOLUMEFMTINTERNAL pVol = hVolFmt;
675	AssertReturn(off + cbWrite <= pVol->pEntry->cbPart, VERR_INVALID_PARAMETER);
676
677	return rtDvmDiskWrite(pVol->pVolMgr->pDisk, pVol->pEntry->offPart + off, pvBuf, cbWrite);
678	}
679
680	RTDVMFMTOPS g_rtDvmFmtMbr =
681	{
682	/* pszFmt */
683	"MBR",
684	/* enmFormat */
685	RTDVMFORMATTYPE_MBR,
686	/* pfnProbe */
687	rtDvmFmtMbrProbe,
688	/* pfnOpen */
689	rtDvmFmtMbrOpen,
690	/* pfnInitialize */
691	rtDvmFmtMbrInitialize,
692	/* pfnClose */
693	rtDvmFmtMbrClose,
694	/* pfnQueryRangeUse */
695	rtDvmFmtMbrQueryRangeUse,
696	/* pfnGetValidVolumes */
697	rtDvmFmtMbrGetValidVolumes,
698	/* pfnGetMaxVolumes */
699	rtDvmFmtMbrGetMaxVolumes,
700	/* pfnQueryFirstVolume */
701	rtDvmFmtMbrQueryFirstVolume,
702	/* pfnQueryNextVolume */
703	rtDvmFmtMbrQueryNextVolume,
704	/* pfnVolumeClose */
705	rtDvmFmtMbrVolumeClose,
706	/* pfnVolumeGetSize */
707	rtDvmFmtMbrVolumeGetSize,
708	/* pfnVolumeQueryName */
709	rtDvmFmtMbrVolumeQueryName,
710	/* pfnVolumeGetType */
711	rtDvmFmtMbrVolumeGetType,
712	/* pfnVolumeGetFlags */
713	rtDvmFmtMbrVolumeGetFlags,
714	/* pfnVOlumeIsRangeIntersecting */
715	rtDvmFmtMbrVolumeIsRangeIntersecting,
716	/* pfnVolumeRead */
717	rtDvmFmtMbrVolumeRead,
718	/* pfnVolumeWrite */
719	rtDvmFmtMbrVolumeWrite
720	};
721

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source: vbox/trunk/src/VBox/Runtime/common/dvm/dvmmbr.cpp@ 76553

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