dvm.h@ 104212

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1	/** @file
2	* IPRT Disk Volume Management API (DVM).
3	*/
4
5	/*
6	* Copyright (C) 2011-2023 Oracle and/or its affiliates.
7	*
8	* This file is part of VirtualBox base platform packages, as
9	* available from https://www.virtualbox.org.
10	*
11	* This program is free software; you can redistribute it and/or
12	* modify it under the terms of the GNU General Public License
13	* as published by the Free Software Foundation, in version 3 of the
14	* License.
15	*
16	* This program is distributed in the hope that it will be useful, but
17	* WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19	* General Public License for more details.
20	*
21	* You should have received a copy of the GNU General Public License
22	* along with this program; if not, see <https://www.gnu.org/licenses>.
23	*
24	* The contents of this file may alternatively be used under the terms
25	* of the Common Development and Distribution License Version 1.0
26	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
27	* in the VirtualBox distribution, in which case the provisions of the
28	* CDDL are applicable instead of those of the GPL.
29	*
30	* You may elect to license modified versions of this file under the
31	* terms and conditions of either the GPL or the CDDL or both.
32	*
33	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
34	*/
35
36	#ifndef IPRT_INCLUDED_dvm_h
37	#define IPRT_INCLUDED_dvm_h
38	#ifndef RT_WITHOUT_PRAGMA_ONCE
39	# pragma once
40	#endif
41
42	#include <iprt/types.h>
43
44	RT_C_DECLS_BEGIN
45
46
47	/** @defgroup grp_rt_dvm IPRT Disk Volume Management
48	* @ingroup grp_rt
49	* @{
50	*/
51
52	/**
53	* Volume type.
54	* Comparable to the FS type in MBR partition maps
55	* or the partition type GUIDs in GPT tables.
56	*/
57	typedef enum RTDVMVOLTYPE
58	{
59	/** Invalid. */
60	RTDVMVOLTYPE_INVALID = 0,
61	/** Unknown. */
62	RTDVMVOLTYPE_UNKNOWN,
63	/** Volume hosts a NTFS filesystem. */
64	RTDVMVOLTYPE_NTFS,
65	/** Volume hosts a FAT12 filesystem. */
66	RTDVMVOLTYPE_FAT12,
67	/** Volume hosts a FAT16 filesystem. */
68	RTDVMVOLTYPE_FAT16,
69	/** Volume hosts a FAT32 filesystem. */
70	RTDVMVOLTYPE_FAT32,
71
72	/** EFI system partition (c12a7328-f81f-11d2-ba4b-00a0c93ec93b). */
73	RTDVMVOLTYPE_EFI_SYSTEM,
74
75	/** Volume hosts a Mac OS X HFS or HFS+ filesystem. */
76	RTDVMVOLTYPE_DARWIN_HFS,
77	/** Volume hosts a Mac OS X APFS filesystem. */
78	RTDVMVOLTYPE_DARWIN_APFS,
79
80	/** Volume hosts a Linux swap. */
81	RTDVMVOLTYPE_LINUX_SWAP,
82	/** Volume hosts a Linux filesystem. */
83	RTDVMVOLTYPE_LINUX_NATIVE,
84	/** Volume hosts a Linux LVM. */
85	RTDVMVOLTYPE_LINUX_LVM,
86	/** Volume hosts a Linux SoftRaid. */
87	RTDVMVOLTYPE_LINUX_SOFTRAID,
88
89	/** Volume hosts a FreeBSD disklabel. */
90	RTDVMVOLTYPE_FREEBSD,
91	/** Volume hosts a NetBSD disklabel. */
92	RTDVMVOLTYPE_NETBSD,
93	/** Volume hosts a OpenBSD disklabel. */
94	RTDVMVOLTYPE_OPENBSD,
95	/** Volume hosts a Solaris volume. */
96	RTDVMVOLTYPE_SOLARIS,
97
98	/** Volume hosts a Windows basic data partition . */
99	RTDVMVOLTYPE_WIN_BASIC,
100	/** Volume hosts a Microsoft reserved partition (MSR). */
101	RTDVMVOLTYPE_WIN_MSR,
102	/** Volume hosts a Windows logical disk manager (LDM) metadata partition. */
103	RTDVMVOLTYPE_WIN_LDM_META,
104	/** Volume hosts a Windows logical disk manager (LDM) data partition. */
105	RTDVMVOLTYPE_WIN_LDM_DATA,
106	/** Volume hosts a Windows recovery partition. */
107	RTDVMVOLTYPE_WIN_RECOVERY,
108	/** Volume hosts a storage spaces partition. */
109	RTDVMVOLTYPE_WIN_STORAGE_SPACES,
110
111	/** Volume hosts an IBM general parallel file system (GPFS). */
112	RTDVMVOLTYPE_IBM_GPFS,
113
114	/** OS/2 (Arca Noae) type 1 partition. */
115	RTDVMVOLTYPE_ARCA_OS2,
116
117	/** End of the valid values. */
118	RTDVMVOLTYPE_END,
119	/** Usual 32bit hack. */
120	RTDVMVOLTYPE_32BIT_HACK = 0x7fffffff
121	} RTDVMVOLTYPE;
122
123	/** @defgroup grp_dvm_flags Flags used by RTDvmCreate.
124	* @{ */
125	/** DVM flags - Blocks are always marked as unused if the volume has
126	* no block status callback set.
127	* The default is to mark them as used. */
128	#define DVM_FLAGS_NO_STATUS_CALLBACK_MARK_AS_UNUSED RT_BIT_32(0)
129	/** DVM flags - Space which is unused in the map will be marked as used
130	* when calling RTDvmMapQueryBlockStatus(). */
131	#define DVM_FLAGS_UNUSED_SPACE_MARK_AS_USED RT_BIT_32(1)
132	/** Mask of all valid flags. */
133	#define DVM_FLAGS_VALID_MASK UINT32_C(0x00000003)
134	/** @} */
135
136
137	/** @defgroup grp_dvm_vol_flags Volume flags used by RTDvmVolumeGetFlags().
138	* @{ */
139	/** Volume flags - Volume is bootable. */
140	#define DVMVOLUME_FLAGS_BOOTABLE RT_BIT_64(0)
141	/** Volume flags - Volume is active. */
142	#define DVMVOLUME_FLAGS_ACTIVE RT_BIT_64(1)
143	/** Volume is contiguous on the underlying medium and RTDvmVolumeQueryRange(). */
144	#define DVMVOLUME_F_CONTIGUOUS RT_BIT_64(2)
145	/** @} */
146
147	/** A handle to a volume manager. */
148	typedef struct RTDVMINTERNAL *RTDVM;
149	/** A pointer to a volume manager handle. */
150	typedef RTDVM *PRTDVM;
151	/** NIL volume manager handle. */
152	#define NIL_RTDVM ((RTDVM)~0)
153
154	/** A handle to a volume in a volume map. */
155	typedef struct RTDVMVOLUMEINTERNAL *RTDVMVOLUME;
156	/** A pointer to a volume handle. */
157	typedef RTDVMVOLUME *PRTDVMVOLUME;
158	/** NIL volume handle. */
159	#define NIL_RTDVMVOLUME ((RTDVMVOLUME)~0)
160
161	/**
162	* Callback for querying the block allocation status of a volume.
163	*
164	* @returns IPRT status code.
165	* @param pvUser Opaque user data passed when setting the callback.
166	* @param off Offset relative to the start of the volume.
167	* @param cb Range to check in bytes.
168	* @param pfAllocated Where to store the allocation status on success.
169	*/
170	typedef DECLCALLBACKTYPE(int, FNDVMVOLUMEQUERYBLOCKSTATUS,(void pvUser, uint64_t off, uint64_t cb, bool pfAllocated));
171	/** Pointer to a query block allocation status callback. */
172	typedef FNDVMVOLUMEQUERYBLOCKSTATUS *PFNDVMVOLUMEQUERYBLOCKSTATUS;
173
174	/**
175	* Create a new volume manager.
176	*
177	* @returns IPRT status.
178	* @param phVolMgr Where to store the handle to the volume manager on
179	* success.
180	* @param hVfsFile The disk/container/whatever.
181	* @param cbSector Size of one sector in bytes.
182	* @param fFlags Combination of RTDVM_FLAGS_*
183	*/
184	RTDECL(int) RTDvmCreate(PRTDVM phVolMgr, RTVFSFILE hVfsFile, uint32_t cbSector, uint32_t fFlags);
185
186	/**
187	* Retain a given volume manager.
188	*
189	* @returns New reference count on success, UINT32_MAX on failure.
190	* @param hVolMgr The volume manager to retain.
191	*/
192	RTDECL(uint32_t) RTDvmRetain(RTDVM hVolMgr);
193
194	/**
195	* Releases a given volume manager.
196	*
197	* @returns New reference count on success (0 if closed), UINT32_MAX on failure.
198	* @param hVolMgr The volume manager to release.
199	*/
200	RTDECL(uint32_t) RTDvmRelease(RTDVM hVolMgr);
201
202	/**
203	* Probes the underyling disk for the best volume manager format handler
204	* and opens it.
205	*
206	* @returns IPRT status code.
207	* @retval VERR_NOT_FOUND if no backend can handle the volume map on the disk.
208	* @param hVolMgr The volume manager handle.
209	*/
210	RTDECL(int) RTDvmMapOpen(RTDVM hVolMgr);
211
212	/**
213	* Initializes a new volume map using the given format handler.
214	*
215	* @returns IPRT status code.
216	* @param hVolMgr The volume manager handle.
217	* @param pszFmt The format to use for the new map.
218	*/
219	RTDECL(int) RTDvmMapInitialize(RTDVM hVolMgr, const char *pszFmt);
220
221	/**
222	* Gets the name of the currently used format of the disk map.
223	*
224	* @returns Name of the format.
225	* @param hVolMgr The volume manager handle.
226	*/
227	RTDECL(const char *) RTDvmMapGetFormatName(RTDVM hVolMgr);
228
229	/**
230	* DVM format types.
231	*/
232	typedef enum RTDVMFORMATTYPE
233	{
234	/** Invalid zero value. */
235	RTDVMFORMATTYPE_INVALID = 0,
236	/** Master boot record. */
237	RTDVMFORMATTYPE_MBR,
238	/** GUID partition table. */
239	RTDVMFORMATTYPE_GPT,
240	/** BSD labels. */
241	RTDVMFORMATTYPE_BSD_LABEL,
242	/** End of valid values. */
243	RTDVMFORMATTYPE_END,
244	/** 32-bit type size hack. */
245	RTDVMFORMATTYPE_32BIT_HACK = 0x7fffffff
246	} RTDVMFORMATTYPE;
247
248	/**
249	* Gets the format type of the current disk map.
250	*
251	* @returns Format type. RTDVMFORMATTYPE_INVALID on invalid input.
252	* @param hVolMgr The volume manager handle.
253	*/
254	RTDECL(RTDVMFORMATTYPE) RTDvmMapGetFormatType(RTDVM hVolMgr);
255
256	/**
257	* Gets the UUID of the disk if applicable.
258	*
259	* Disks using the MBR format may return the 32-bit disk identity in the
260	* u32TimeLow field and set the rest to zero.
261	*
262	* @returns IPRT status code.
263	* @retval VERR_NOT_SUPPORTED if the partition scheme doesn't do UUIDs.
264	* @retval VINF_NOT_SUPPORTED if non-UUID disk ID is returned.
265	* @param hVolMgr The volume manager handle.
266	* @param pUuid Where to return the UUID.
267	*
268	* @todo It's quite possible this should be turned into a map-level edition of
269	* RTDvmVolumeQueryProp...
270	*/
271	RTDECL(int) RTDvmMapQueryDiskUuid(RTDVM hVolMgr, PRTUUID pUuid);
272
273	/**
274	* Gets the number of valid partitions in the map.
275	*
276	* @returns The number of valid volumes in the map or UINT32_MAX on failure.
277	* @param hVolMgr The volume manager handle.
278	*/
279	RTDECL(uint32_t) RTDvmMapGetValidVolumes(RTDVM hVolMgr);
280
281	/**
282	* Gets the maximum number of partitions the map can hold.
283	*
284	* @returns The maximum number of volumes in the map or UINT32_MAX on failure.
285	* @param hVolMgr The volume manager handle.
286	*/
287	RTDECL(uint32_t) RTDvmMapGetMaxVolumes(RTDVM hVolMgr);
288
289	/**
290	* Get the first valid volume from a map.
291	*
292	* @returns IPRT status code.
293	* @param hVolMgr The volume manager handle.
294	* @param phVol Where to store the handle to the first volume on
295	* success. Release with RTDvmVolumeRelease().
296	*/
297	RTDECL(int) RTDvmMapQueryFirstVolume(RTDVM hVolMgr, PRTDVMVOLUME phVol);
298
299	/**
300	* Get the first valid volume from a map.
301	*
302	* @returns IPRT status code.
303	* @param hVolMgr The volume manager handle.
304	* @param hVol Handle of the current volume.
305	* @param phVolNext Where to store the handle to the next volume on
306	* success. Release with RTDvmVolumeRelease().
307	*/
308	RTDECL(int) RTDvmMapQueryNextVolume(RTDVM hVolMgr, RTDVMVOLUME hVol, PRTDVMVOLUME phVolNext);
309
310	/**
311	* Returns whether the given block on the disk is in use.
312	*
313	* @returns IPRT status code.
314	* @param hVolMgr The volume manager handle.
315	* @param off The start offset to check for.
316	* @param cb The range in bytes to check.
317	* @param pfAllocated Where to store the in-use status on success.
318	*
319	* @remark This method will return true even if a part of the range is not in use.
320	*/
321	RTDECL(int) RTDvmMapQueryBlockStatus(RTDVM hVolMgr, uint64_t off, uint64_t cb, bool *pfAllocated);
322
323	/**
324	* Partition/map table location information.
325	* @sa RTDvmMapQueryTableLocations
326	*/
327	typedef struct RTDVMTABLELOCATION
328	{
329	/** The byte offset on the underlying media. */
330	uint64_t off;
331	/** The table size in bytes. */
332	uint64_t cb;
333	/** Number of padding bytes / free space between the actual table and
334	* first partition. */
335	uint64_t cbPadding;
336	} RTDVMTABLELOCATION;
337	/** Pointer to partition table location info. */
338	typedef RTDVMTABLELOCATION *PRTDVMTABLELOCATION;
339	/** Pointer to const partition table location info. */
340	typedef RTDVMTABLELOCATION const *PCRTDVMTABLELOCATION;
341
342
343	/** @name RTDVMMAPQTABLOC_F_XXX - Flags for RTDvmMapQueryTableLocations
344	* @{ */
345	/** Make sure GPT includes the protective MBR. */
346	#define RTDVMMAPQTABLOC_F_INCLUDE_LEGACY RT_BIT_32(0)
347	/** Valid flags. */
348	#define RTDVMMAPQTABLOC_F_VALID_MASK UINT32_C(1)
349	/** @} */
350
351	/**
352	* Query the partition table locations.
353	*
354	* @returns IPRT status code.
355	* @retval VERR_BUFFER_OVERFLOW if the table is too small, @a *pcActual will be
356	* set to the required size.
357	* @retval VERR_BUFFER_UNDERFLOW if the table is too big and @a pcActual is
358	* NULL.
359	* @param hVolMgr The volume manager handle.
360	* @param fFlags Flags, see RTDVMMAPQTABLOC_F_XXX.
361	* @param paLocations Where to return the info. This can be NULL if @a
362	* cLocations is zero and @a pcActual is given.
363	* @param cLocations The size of @a paLocations in items.
364	* @param pcActual Where to return the actual number of locations, or
365	* on VERR_BUFFER_OVERFLOW the necessary table size.
366	* Optional, when not specified the cLocations value
367	* must match exactly or it fails with
368	* VERR_BUFFER_UNDERFLOW.
369	*/
370	RTDECL(int) RTDvmMapQueryTableLocations(RTDVM hVolMgr, uint32_t fFlags,
371	PRTDVMTABLELOCATION paLocations, size_t cLocations, size_t *pcActual);
372
373	/**
374	* Retains a valid volume handle.
375	*
376	* @returns New reference count on success, UINT32_MAX on failure.
377	* @param hVol The volume to retain.
378	*/
379	RTDECL(uint32_t) RTDvmVolumeRetain(RTDVMVOLUME hVol);
380
381	/**
382	* Releases a valid volume handle.
383	*
384	* @returns New reference count on success (0 if closed), UINT32_MAX on failure.
385	* @param hVol The volume to release.
386	*/
387	RTDECL(uint32_t) RTDvmVolumeRelease(RTDVMVOLUME hVol);
388
389	/**
390	* Sets the callback to query the block allocation status for a volume.
391	* This overwrites any other callback set previously.
392	*
393	* @param hVol The volume handle.
394	* @param pfnQueryBlockStatus The callback to set. Can be NULL to disable
395	* a previous callback.
396	* @param pvUser Opaque user data passed in the callback.
397	*/
398	RTDECL(void) RTDvmVolumeSetQueryBlockStatusCallback(RTDVMVOLUME hVol,
399	PFNDVMVOLUMEQUERYBLOCKSTATUS pfnQueryBlockStatus,
400	void *pvUser);
401
402	/**
403	* Get the size of a volume in bytes.
404	*
405	* @returns Size of the volume in bytes or 0 on failure.
406	* @param hVol The volume handle.
407	*/
408	RTDECL(uint64_t) RTDvmVolumeGetSize(RTDVMVOLUME hVol);
409
410	/**
411	* Gets the name of the volume if supported.
412	*
413	* @returns IPRT status code.
414	* @param hVol The volume handle.
415	* @param ppszVolName Where to store the name of the volume on success.
416	* The string must be freed with RTStrFree().
417	*/
418	RTDECL(int) RTDvmVolumeQueryName(RTDVMVOLUME hVol, char **ppszVolName);
419
420	/**
421	* Get the volume type of the volume if supported.
422	*
423	* @returns The volume type on success, DVMVOLTYPE_INVALID if hVol is invalid.
424	* @param hVol The volume handle.
425	*/
426	RTDECL(RTDVMVOLTYPE) RTDvmVolumeGetType(RTDVMVOLUME hVol);
427
428	/**
429	* Get the volume flags of the volume if supported.
430	*
431	* @returns The volume flags or UINT64_MAX on failure.
432	* @param hVol The volume handle.
433	*/
434	RTDECL(uint64_t) RTDvmVolumeGetFlags(RTDVMVOLUME hVol);
435
436	/**
437	* Queries the range of the given volume on the underlying medium.
438	*
439	* @returns IPRT status code.
440	* @retval VERR_NOT_SUPPORTED if the DVMVOLUME_F_CONTIGUOUS flag is not returned by RTDvmVolumeGetFlags().
441	* @param hVol The volume handle.
442	* @param poffStart Where to store the start offset in bytes on the underlying medium.
443	* @param poffLast Where to store the last offset in bytes on the underlying medium (inclusive).
444	*/
445	RTDECL(int) RTDvmVolumeQueryRange(RTDVMVOLUME hVol, uint64_t poffStart, uint64_t poffLast);
446
447	/**
448	* Returns the partition/whatever table location of the volume.
449	*
450	* For volume format with a single table, like GPT and BSD-labels, it will
451	* return the location of that table. Though for GPT, the fake MBR will not be
452	* included.
453	*
454	* For logical (extended) MBR-style volumes, this will return the location of
455	* the extended partition table. For primary volumes the MBR location is
456	* returned. The special MBR case is why this operation is done on the volume
457	* rather than the volume manager.
458	*
459	* Using RTDvmVolumeGetIndex with RTDVMVOLIDX_IN_PART_TABLE should get you
460	* the index in the table returned by this function.
461	*
462	* @returns IPRT status code.
463	* @param hVol The volume handle.
464	* @param poffTable Where to return the byte offset on the underlying
465	* media of the (partition/volume/whatever) table.
466	* @param pcbTable Where to return the table size in bytes. (This does
467	* not include any alignment padding or such, just
468	* padding up to sector/block size.)
469	*/
470	RTDECL(int) RTDvmVolumeQueryTableLocation(RTDVMVOLUME hVol, uint64_t poffTable, uint64_t pcbTable);
471
472	/**
473	* RTDvmVolumeGetIndex indexes.
474	*/
475	typedef enum RTDVMVOLIDX
476	{
477	/** Invalid zero value. */
478	RTDVMVOLIDX_INVALID = 0,
479	/** Index matching the host's volume numbering.
480	* This is a pseudo index, that gets translated to one of the others depending
481	* on which host we're running on. */
482	RTDVMVOLIDX_HOST,
483	/** Only consider user visible ones, i.e. don't count MBR extended partition
484	* entries and such like. */
485	RTDVMVOLIDX_USER_VISIBLE,
486	/** Index when all volumes, user visible, hidden, special, whatever ones are
487	* included.
488	*
489	* For MBR this is 1-based index where all primary entires are included whether
490	* in use or not. Only non-empty entries in extended tables are counted, though
491	* the forward link is included. */
492	RTDVMVOLIDX_ALL,
493	/** The raw index within the partition/volume/whatever table. This have a kind
494	* of special meaning to MBR, where there are multiple tables. */
495	RTDVMVOLIDX_IN_TABLE,
496	/** Follows the linux /dev/sdaX convention as closely as absolutely possible. */
497	RTDVMVOLIDX_LINUX,
498	/** End of valid indexes. */
499	RTDVMVOLIDX_END,
500	/** Make sure the type is 32-bit. */
501	RTDVMVOLIDX_32BIT_HACK = 0x7fffffff
502	} RTDVMVOLIDX;
503
504	/**
505	* Gets the tiven index for the specified volume.
506	*
507	* @returns The requested index, UINT32_MAX on failure.
508	* @param hVol The volume handle.
509	* @param enmIndex Which kind of index to get for the volume.
510	*/
511	RTDECL(uint32_t) RTDvmVolumeGetIndex(RTDVMVOLUME hVol, RTDVMVOLIDX enmIndex);
512
513	/**
514	* Volume properties queriable via RTDvmVolumeQueryProp.
515	*
516	* @note Integer values can typically be queried in multiple sizes. This is
517	* handled by the frontend code. The format specific backends only
518	* have to handle the smallest allowed size.
519	*/
520	typedef enum RTDVMVOLPROP
521	{
522	/** Customary invalid zero value. */
523	RTDVMVOLPROP_INVALID = 0,
524	/** unsigned[16,32,64]: MBR first cylinder (0-based, CHS). */
525	RTDVMVOLPROP_MBR_FIRST_CYLINDER,
526	/** unsigned[8,16,32,64]: MBR first head (0-based, CHS). */
527	RTDVMVOLPROP_MBR_FIRST_HEAD,
528	/** unsigned[8,16,32,64]: MBR first sector (1-based, CHS). */
529	RTDVMVOLPROP_MBR_FIRST_SECTOR,
530	/** unsigned[16,32,64]: MBR last cylinder (0-based, CHS). */
531	RTDVMVOLPROP_MBR_LAST_CYLINDER,
532	/** unsigned[8,16,32,64]: MBR last head (0-based, CHS). */
533	RTDVMVOLPROP_MBR_LAST_HEAD,
534	/** unsigned[8,16,32,64]: MBR last sector (1-based, CHS). */
535	RTDVMVOLPROP_MBR_LAST_SECTOR,
536	/** unsigned[8,16,32,64]: MBR partition type. */
537	RTDVMVOLPROP_MBR_TYPE,
538	/** RTUUID: GPT volume type. */
539	RTDVMVOLPROP_GPT_TYPE,
540	/** RTUUID: GPT volume UUID. */
541	RTDVMVOLPROP_GPT_UUID,
542	/** End of valid values. */
543	RTDVMVOLPROP_END,
544	/** Make sure the type is 32-bit. */
545	RTDVMVOLPROP_32BIT_HACK = 0x7fffffff
546	} RTDVMVOLPROP;
547
548	/**
549	* Query a generic volume property.
550	*
551	* This is an extensible interface for retrieving mostly format specific
552	* information, or information that's not commonly used. (It's modeled after
553	* RTLdrQueryPropEx.)
554	*
555	* @returns IPRT status code.
556	* @retval VERR_NOT_SUPPORTED if the property query isn't supported (either all
557	* or that specific property). The caller must handle this result.
558	* @retval VERR_NOT_FOUND is currently not returned, but intended for cases
559	* where it wasn't present in the tables.
560	* @retval VERR_INVALID_FUNCTION if the @a enmProperty value is wrong.
561	* @retval VERR_INVALID_PARAMETER if the fixed buffer size is wrong. Correct
562	* size in @a *pcbBuf.
563	* @retval VERR_BUFFER_OVERFLOW if the property doesn't have a fixed size
564	* buffer and the buffer isn't big enough. Correct size in @a *pcbBuf.
565	* @retval VERR_INVALID_HANDLE if the handle is invalid.
566	* @param hVol Handle to the volume.
567	* @param enmProperty The property to query.
568	* @param pvBuf Pointer to the input / output buffer. In most cases
569	* it's only used for returning data.
570	* @param cbBuf The size of the buffer.
571	* @param pcbBuf Where to return the amount of data returned. On
572	* buffer size errors, this is set to the correct size.
573	* Optional.
574	* @sa RTDvmVolumeGetPropU64
575	*/
576	RTDECL(int) RTDvmVolumeQueryProp(RTDVMVOLUME hVol, RTDVMVOLPROP enmProperty, void pvBuf, size_t cbBuf, size_t pcbBuf);
577
578	/**
579	* Wrapper around RTDvmVolumeQueryProp for simplifying getting unimportant
580	* integer properties.
581	*
582	* @returns The property value if supported and found, the default value if not.
583	* Errors other than VERR_NOT_SUPPORTED and VERR_NOT_FOUND are
584	* asserted.
585	* @param hVol Handle to the volume.
586	* @param enmProperty The property to query.
587	* @param uDefault The value to return on error.
588	* @sa RTDvmVolumeQueryProp
589	*/
590	RTDECL(uint64_t) RTDvmVolumeGetPropU64(RTDVMVOLUME hVol, RTDVMVOLPROP enmProperty, uint64_t uDefault);
591
592	/**
593	* Reads data from the given volume.
594	*
595	* @returns IPRT status code.
596	* @param hVol The volume handle.
597	* @param off Where to start reading from - 0 is the beginning of
598	* the volume.
599	* @param pvBuf Where to store the read data.
600	* @param cbRead How many bytes to read.
601	*/
602	RTDECL(int) RTDvmVolumeRead(RTDVMVOLUME hVol, uint64_t off, void *pvBuf, size_t cbRead);
603
604	/**
605	* Writes data to the given volume.
606	*
607	* @returns IPRT status code.
608	* @param hVol The volume handle.
609	* @param off Where to start writing to - 0 is the beginning of
610	* the volume.
611	* @param pvBuf The data to write.
612	* @param cbWrite How many bytes to write.
613	*/
614	RTDECL(int) RTDvmVolumeWrite(RTDVMVOLUME hVol, uint64_t off, const void *pvBuf, size_t cbWrite);
615
616	/**
617	* Returns the description of a given volume type.
618	*
619	* @returns The description of the type.
620	* @param enmVolType The volume type.
621	*/
622	RTDECL(const char *) RTDvmVolumeTypeGetDescr(RTDVMVOLTYPE enmVolType);
623
624	/**
625	* Creates an VFS file from a volume handle.
626	*
627	* @returns IPRT status code.
628	* @param hVol The volume handle.
629	* @param fOpen RTFILE_O_XXX.
630	* @param phVfsFileOut Where to store the VFS file handle on success.
631	*/
632	RTDECL(int) RTDvmVolumeCreateVfsFile(RTDVMVOLUME hVol, uint64_t fOpen, PRTVFSFILE phVfsFileOut);
633
634	RT_C_DECLS_END
635
636	/** @} */
637
638	#endif /* !IPRT_INCLUDED_dvm_h */
639

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source: vbox/trunk/include/iprt/dvm.h@ 104212

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