HBDMgmt-win.cpp@ 65819

Last change on this file since 65819 was 64274, checked in by vboxsync, 8 years ago
Devices/Storage: Doxygen fixes
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1	/* $Id: HBDMgmt-win.cpp 64274 2016-10-14 10:33:43Z vboxsync $ */
2	/** @file
3	* VBox storage devices: Host block device management API.
4	*/
5
6	/*
7	* Copyright (C) 2015-2016 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	#define LOG_GROUP LOG_GROUP_DRV_VD
18	#include <VBox/cdefs.h>
19	#include <VBox/err.h>
20	#include <VBox/log.h>
21	#include <iprt/assert.h>
22	#include <iprt/string.h>
23	#include <iprt/mem.h>
24	#include <iprt/semaphore.h>
25	#include <iprt/list.h>
26
27	#include <iprt/nt/nt-and-windows.h>
28	#include <iprt/win/windows.h>
29
30	#include "HBDMgmt.h"
31
32
33	/*********************************************************************************************************************************
34	* Defined Constants And Macros *
35	*********************************************************************************************************************************/
36
37
38	/*********************************************************************************************************************************
39	* Structures and Typedefs *
40	*********************************************************************************************************************************/
41
42	/**
43	* Claimed block device state.
44	*/
45	typedef struct HBDMGRDEV
46	{
47	/** List node. */
48	RTLISTNODE ListNode;
49	/** The block device name. */
50	char *pszDevice;
51	/** Number of volumes for this block device. */
52	unsigned cVolumes;
53	/** Array of handle to the volumes for unmounting and taking it offline. */
54	HANDLE ahVolumes[1];
55	} HBDMGRDEV;
56	/** Pointer to a claimed block device. */
57	typedef HBDMGRDEV *PHBDMGRDEV;
58
59	/**
60	* Internal Host block device manager state.
61	*/
62	typedef struct HBDMGRINT
63	{
64	/** List of claimed block devices. */
65	RTLISTANCHOR ListClaimed;
66	/** Fast mutex protecting the list. */
67	RTSEMFASTMUTEX hMtxList;
68	} HBDMGRINT;
69	/** Pointer to an interal block device manager state. */
70	typedef HBDMGRINT *PHBDMGRINT;
71
72	#define HBDMGR_NT_HARDDISK_START "\\Device\\Harddisk"
73
74
75	/*********************************************************************************************************************************
76	* Global Variables *
77	*********************************************************************************************************************************/
78
79
80	/*********************************************************************************************************************************
81	* Internal Functions *
82	*********************************************************************************************************************************/
83
84	/**
85	* Unclaims the given block device and frees its state removing it from the list.
86	*
87	* @returns nothing.
88	* @param pDev The block device to unclaim.
89	*/
90	static void hbdMgrDevUnclaim(PHBDMGRDEV pDev)
91	{
92	LogFlowFunc(("pDev=%p{%s} cVolumes=%u\n", pDev, pDev->pszDevice, pDev->cVolumes));
93
94	for (unsigned i = 0; i < pDev->cVolumes; i++)
95	{
96	DWORD dwReturned = 0;
97
98	LogFlowFunc(("Taking volume %u online\n", i));
99	BOOL bRet = DeviceIoControl(pDev->ahVolumes[i], IOCTL_VOLUME_ONLINE, NULL, 0, NULL, 0, &dwReturned, NULL);
100	if (!bRet)
101	LogRel(("HBDMgmt: Failed to take claimed volume online during cleanup: %s{%Rrc}\n",
102	pDev->pszDevice, RTErrConvertFromWin32(GetLastError())));
103
104	CloseHandle(pDev->ahVolumes[i]);
105	}
106
107	RTListNodeRemove(&pDev->ListNode);
108	RTStrFree(pDev->pszDevice);
109	RTMemFree(pDev);
110	}
111
112	/**
113	* Returns the block device given by the filename if claimed or NULL.
114	*
115	* @returns Pointer to the claimed block device or NULL if not claimed.
116	* @param pThis The block device manager.
117	* @param pszFilename The name to look for.
118	*/
119	static PHBDMGRDEV hbdMgrDevFindByName(PHBDMGRINT pThis, const char *pszFilename)
120	{
121	bool fFound = false;
122
123	PHBDMGRDEV pIt;
124	RTListForEach(&pThis->ListClaimed, pIt, HBDMGRDEV, ListNode)
125	{
126	if (!RTStrCmp(pszFilename, pIt->pszDevice))
127	{
128	fFound = true;
129	break;
130	}
131	}
132
133	return fFound ? pIt : NULL;
134	}
135
136	/**
137	* Queries the target in the NT namespace of the given symbolic link.
138	*
139	* @returns VBox status code.
140	* @param pwszLinkNt The symbolic link to query the target for.
141	* @param ppwszLinkTarget Where to store the link target in the NT namespace on success.
142	* Must be freed with RTUtf16Free().
143	*/
144	static int hbdMgrQueryNtLinkTarget(PRTUTF16 pwszLinkNt, PRTUTF16 *ppwszLinkTarget)
145	{
146	int rc = VINF_SUCCESS;
147	HANDLE hFile = RTNT_INVALID_HANDLE_VALUE;
148	IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
149	UNICODE_STRING NtName;
150
151	NtName.Buffer = (PWSTR)pwszLinkNt;
152	NtName.Length = (USHORT)(RTUtf16Len(pwszLinkNt) * sizeof(RTUTF16));
153	NtName.MaximumLength = NtName.Length + sizeof(RTUTF16);
154
155	OBJECT_ATTRIBUTES ObjAttr;
156	InitializeObjectAttributes(&ObjAttr, &NtName, OBJ_CASE_INSENSITIVE, NULL /hRootDir/, NULL /pSecDesc/);
157
158	NTSTATUS rcNt = NtOpenSymbolicLinkObject(&hFile, SYMBOLIC_LINK_QUERY, &ObjAttr);
159	if (NT_SUCCESS(rcNt))
160	{
161	UNICODE_STRING UniStr;
162	RTUTF16 awszBuf[1024];
163	RT_ZERO(awszBuf);
164	UniStr.Buffer = awszBuf;
165	UniStr.MaximumLength = sizeof(awszBuf);
166	rcNt = NtQuerySymbolicLinkObject(hFile, &UniStr, NULL);
167	if (NT_SUCCESS(rcNt))
168	{
169	*ppwszLinkTarget = RTUtf16Dup((PRTUTF16)UniStr.Buffer);
170	if (!*ppwszLinkTarget)
171	rc = VERR_NO_STR_MEMORY;
172	}
173	else
174	rc = RTErrConvertFromNtStatus(rcNt);
175
176	CloseHandle(hFile);
177	}
178	else
179	rc = RTErrConvertFromNtStatus(rcNt);
180
181	return rc;
182	}
183
184	/**
185	* Queries the harddisk volume device in the NT namespace for the given Win32
186	* block device path.
187	*
188	* @returns VBox status code.
189	* @param pwszDriveWin32 The Win32 path to the block device (e.g. "\\.\PhysicalDrive0" for example)
190	* @param ppwszDriveNt Where to store the NT path to the volume on success.
191	* Must be freed with RTUtf16Free().
192	*/
193	static int hbdMgrQueryNtName(PRTUTF16 pwszDriveWin32, PRTUTF16 *ppwszDriveNt)
194	{
195	int rc = VINF_SUCCESS;
196	RTUTF16 awszFileNt[1024];
197
198	/*
199	* Make sure the path is at least 5 characters long so we can safely access
200	* the part following \\.\ below.
201	*/
202	AssertReturn(RTUtf16Len(pwszDriveWin32) >= 5, VERR_INVALID_STATE);
203
204	RT_ZERO(awszFileNt);
205	RTUtf16CatAscii(awszFileNt, RT_ELEMENTS(awszFileNt), "\\??\\");
206	RTUtf16Cat(awszFileNt, RT_ELEMENTS(awszFileNt), &pwszDriveWin32[4]);
207
208	/* Make sure there is no trailing \ at the end or we will fail. */
209	size_t cwcPath = RTUtf16Len(awszFileNt);
210	if (awszFileNt[cwcPath - 1] == L'\\')
211	awszFileNt[cwcPath - 1] = L'\0';
212
213	return hbdMgrQueryNtLinkTarget(awszFileNt, ppwszDriveNt);
214	}
215
216	static int hbdMgrQueryAllMountpointsForDisk(PRTUTF16 pwszDiskNt, PRTUTF16 **ppapwszVolumes,
217	unsigned *pcVolumes)
218	{
219	/*
220	* Try to get the symlink target for every partition, we will take the easy approach
221	* and just try to open every partition starting with \Device\Harddisk<N>\Partition1
222	* (0 is a special reserved partition linking to the complete disk).
223	*
224	* For every partition we get the target \Device\HarddiskVolume<N> and query all mountpoints
225	* with that.
226	*/
227	int rc = VINF_SUCCESS;
228	char *pszDiskNt = NULL;
229	unsigned cVolumes = 0;
230	unsigned cVolumesMax = 10;
231	PRTUTF16 papwszVolumes = (PRTUTF16 )RTMemAllocZ(cVolumesMax * sizeof(PRTUTF16));
232
233	if (!papwszVolumes)
234	return VERR_NO_MEMORY;
235
236	rc = RTUtf16ToUtf8(pwszDiskNt, &pszDiskNt);
237	if (RT_SUCCESS(rc))
238	{
239	/* Check that the path matches our expectation \Device\Harddisk<N>\DR<N>. */
240	if (!RTStrNCmp(pszDiskNt, HBDMGR_NT_HARDDISK_START, sizeof(HBDMGR_NT_HARDDISK_START) - 1))
241	{
242	uint32_t iDisk = 0;
243
244	rc = RTStrToUInt32Ex(pszDiskNt + sizeof(HBDMGR_NT_HARDDISK_START) - 1, NULL, 10, &iDisk);
245	if (RT_SUCCESS(rc) \|\| rc == VWRN_TRAILING_CHARS)
246	{
247	uint32_t iPart = 1;
248
249	/* Try to query all mount points for all partitions, the simple way. */
250	do
251	{
252	char aszDisk[1024];
253	RT_ZERO(aszDisk);
254
255	size_t cchWritten = RTStrPrintf(&aszDisk[0], sizeof(aszDisk), "\\Device\\Harddisk%u\\Partition%u", iDisk, iPart);
256	if (cchWritten < sizeof(aszDisk))
257	{
258	PRTUTF16 pwszDisk = NULL;
259	rc = RTStrToUtf16(&aszDisk[0], &pwszDisk);
260	if (RT_SUCCESS(rc))
261	{
262	PRTUTF16 pwszTargetNt = NULL;
263
264	rc = hbdMgrQueryNtLinkTarget(pwszDisk, &pwszTargetNt);
265	if (RT_SUCCESS(rc))
266	{
267	if (cVolumes == cVolumesMax)
268	{
269	/* Increase array of volumes. */
270	PRTUTF16 papwszVolumesNew = (PRTUTF16 )RTMemAllocZ((cVolumesMax + 10) * sizeof(PRTUTF16));
271	if (papwszVolumesNew)
272	{
273	cVolumesMax += 10;
274	papwszVolumes = papwszVolumesNew;
275	}
276	else
277	{
278	RTUtf16Free(pwszTargetNt);
279	rc = VERR_NO_MEMORY;
280	}
281	}
282
283	if (RT_SUCCESS(rc))
284	{
285	Assert(cVolumes < cVolumesMax);
286	papwszVolumes[cVolumes++] = pwszTargetNt;
287	iPart++;
288	}
289	}
290	else if (rc == VERR_FILE_NOT_FOUND)
291	{
292	/* The partition does not exist, so stop trying. */
293	rc = VINF_SUCCESS;
294	break;
295	}
296
297	RTUtf16Free(pwszDisk);
298	}
299	}
300	else
301	rc = VERR_BUFFER_OVERFLOW;
302
303	} while (RT_SUCCESS(rc));
304	}
305	}
306	else
307	rc = VERR_INVALID_STATE;
308
309	RTStrFree(pszDiskNt);
310	}
311
312	if (RT_SUCCESS(rc))
313	{
314	*pcVolumes = cVolumes;
315	*ppapwszVolumes = papwszVolumes;
316	LogFlowFunc(("rc=%Rrc cVolumes=%u ppapwszVolumes=%p\n", rc, cVolumes, papwszVolumes));
317	}
318	else
319	{
320	for (unsigned i = 0; i < cVolumes; i++)
321	RTUtf16Free(papwszVolumes[i]);
322
323	RTMemFree(papwszVolumes);
324	}
325
326	return rc;
327	}
328
329	static NTSTATUS hbdMgrNtCreateFileWrapper(PRTUTF16 pwszVolume, HANDLE *phVolume)
330	{
331	HANDLE hVolume = RTNT_INVALID_HANDLE_VALUE;
332	IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
333	UNICODE_STRING NtName;
334
335	NtName.Buffer = (PWSTR)pwszVolume;
336	NtName.Length = (USHORT)(RTUtf16Len(pwszVolume) * sizeof(RTUTF16));
337	NtName.MaximumLength = NtName.Length + sizeof(WCHAR);
338
339	OBJECT_ATTRIBUTES ObjAttr;
340	InitializeObjectAttributes(&ObjAttr, &NtName, OBJ_CASE_INSENSITIVE, NULL /hRootDir/, NULL /pSecDesc/);
341
342	NTSTATUS rcNt = NtCreateFile(&hVolume,
343	FILE_READ_DATA \| FILE_WRITE_DATA \| SYNCHRONIZE,
344	&ObjAttr,
345	&Ios,
346	NULL /* Allocation Size*/,
347	FILE_ATTRIBUTE_NORMAL,
348	FILE_SHARE_READ \| FILE_SHARE_WRITE,
349	FILE_OPEN,
350	FILE_OPEN_FOR_BACKUP_INTENT \| FILE_SYNCHRONOUS_IO_NONALERT,
351	NULL /EaBuffer/,
352	0 /EaLength/);
353	if (NT_SUCCESS(rcNt))
354	rcNt = Ios.Status;
355
356	if (NT_SUCCESS(rcNt))
357	*phVolume = hVolume;
358
359	return rcNt;
360	}
361
362	DECLHIDDEN(int) HBDMgrCreate(PHBDMGR phHbdMgr)
363	{
364	AssertPtrReturn(phHbdMgr, VERR_INVALID_POINTER);
365
366	PHBDMGRINT pThis = (PHBDMGRINT)RTMemAllocZ(sizeof(HBDMGRINT));
367	if (RT_UNLIKELY(!pThis))
368	return VERR_NO_MEMORY;
369
370	int rc = VINF_SUCCESS;
371	RTListInit(&pThis->ListClaimed);
372
373	rc = RTSemFastMutexCreate(&pThis->hMtxList);
374	if (RT_SUCCESS(rc))
375	{
376	*phHbdMgr = pThis;
377	return VINF_SUCCESS;
378	}
379
380	RTMemFree(pThis);
381	return rc;
382	}
383
384	DECLHIDDEN(void) HBDMgrDestroy(HBDMGR hHbdMgr)
385	{
386	PHBDMGRINT pThis = hHbdMgr;
387	AssertPtrReturnVoid(pThis);
388
389	/* Go through all claimed block devices and release them. */
390	RTSemFastMutexRequest(pThis->hMtxList);
391	PHBDMGRDEV pIt, pItNext;
392	RTListForEachSafe(&pThis->ListClaimed, pIt, pItNext, HBDMGRDEV, ListNode)
393	{
394	hbdMgrDevUnclaim(pIt);
395	}
396	RTSemFastMutexRelease(pThis->hMtxList);
397
398	RTSemFastMutexDestroy(pThis->hMtxList);
399	RTMemFree(pThis);
400	}
401
402	DECLHIDDEN(bool) HBDMgrIsBlockDevice(const char *pszFilename)
403	{
404	bool fIsBlockDevice = RTStrNICmp(pszFilename, "\\\\.\\PhysicalDrive", sizeof("\\\\.\\PhysicalDrive") - 1) == 0 ? true : false;
405	if (!fIsBlockDevice)
406	fIsBlockDevice = RTStrNICmp(pszFilename, "\\\\.\\Harddisk", sizeof("\\\\.\\Harddisk") - 1) == 0 ? true : false;
407
408	LogFlowFunc(("returns %s -> %RTbool\n", pszFilename, fIsBlockDevice));
409	return fIsBlockDevice;
410	}
411
412	DECLHIDDEN(int) HBDMgrClaimBlockDevice(HBDMGR hHbdMgr, const char *pszFilename)
413	{
414	PHBDMGRINT pThis = hHbdMgr;
415	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
416	AssertReturn(HBDMgrIsBlockDevice(pszFilename), VERR_INVALID_PARAMETER);
417
418	int rc = VINF_SUCCESS;
419	PHBDMGRDEV pDev = hbdMgrDevFindByName(pThis, pszFilename);
420	if (!pDev)
421	{
422	PRTUTF16 pwszVolume = NULL;
423
424	rc = RTStrToUtf16(pszFilename, &pwszVolume);
425	if (RT_SUCCESS(rc))
426	{
427	PRTUTF16 pwszVolNt = NULL;
428
429	rc = hbdMgrQueryNtName(pwszVolume, &pwszVolNt);
430	if (RT_SUCCESS(rc))
431	{
432	PRTUTF16 *papwszVolumes = NULL;
433	unsigned cVolumes = 0;
434
435	/* Complete disks need to be handled differently. */
436	if (!RTStrNCmp(pszFilename, "\\\\.\\PhysicalDrive", sizeof("\\\\.\\PhysicalDrive") - 1))
437	{
438	rc = hbdMgrQueryAllMountpointsForDisk(pwszVolNt, &papwszVolumes, &cVolumes);
439	RTUtf16Free(pwszVolNt);
440	}
441	else
442	{
443	papwszVolumes = &pwszVolNt;
444	cVolumes = 1;
445	}
446
447	if (RT_SUCCESS(rc))
448	{
449	#ifdef LOG_ENABLED
450	for (unsigned i = 0; i < cVolumes; i++)
451	LogFlowFunc(("Volume %u: %ls\n", i, papwszVolumes[i]));
452	#endif
453	pDev = (PHBDMGRDEV)RTMemAllocZ(RT_OFFSETOF(HBDMGRDEV, ahVolumes[cVolumes]));
454	if (pDev)
455	{
456	pDev->cVolumes = 0;
457	pDev->pszDevice = RTStrDup(pszFilename);
458	if (pDev->pszDevice)
459	{
460	for (unsigned i = 0; i < cVolumes; i++)
461	{
462	HANDLE hVolume;
463
464	NTSTATUS rcNt = hbdMgrNtCreateFileWrapper(papwszVolumes[i], &hVolume);
465	if (NT_SUCCESS(rcNt))
466	{
467	DWORD dwReturned = 0;
468
469	Assert(hVolume != INVALID_HANDLE_VALUE);
470	BOOL bRet = DeviceIoControl(hVolume, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL, 0, &dwReturned, NULL);
471	if (bRet)
472	{
473	bRet = DeviceIoControl(hVolume, IOCTL_VOLUME_OFFLINE, NULL, 0, NULL, 0, &dwReturned, NULL);
474	if (bRet)
475	pDev->ahVolumes[pDev->cVolumes++] = hVolume;
476	else
477	rc = RTErrConvertFromWin32(GetLastError());
478	}
479	else
480	rc = RTErrConvertFromWin32(GetLastError());
481
482	if (RT_FAILURE(rc))
483	CloseHandle(hVolume);
484	}
485	else
486	rc = RTErrConvertFromNtStatus(rcNt);
487	}
488	}
489	else
490	rc = VERR_NO_STR_MEMORY;
491
492	if (RT_SUCCESS(rc))
493	{
494	RTSemFastMutexRequest(pThis->hMtxList);
495	RTListAppend(&pThis->ListClaimed, &pDev->ListNode);
496	RTSemFastMutexRelease(pThis->hMtxList);
497	}
498	else
499	{
500	/* Close all open handles and take the volumes online again. */
501	for (unsigned i = 0; i < pDev->cVolumes; i++)
502	{
503	DWORD dwReturned = 0;
504	BOOL bRet = DeviceIoControl(pDev->ahVolumes[i], IOCTL_VOLUME_ONLINE, NULL, 0, NULL, 0, &dwReturned, NULL);
505	if (!bRet)
506	LogRel(("HBDMgmt: Failed to take claimed volume online during cleanup: %s{%Rrc}\n",
507	pDev->pszDevice, RTErrConvertFromWin32(GetLastError())));
508
509	CloseHandle(pDev->ahVolumes[i]);
510	}
511	if (pDev->pszDevice)
512	RTStrFree(pDev->pszDevice);
513	RTMemFree(pDev);
514	}
515	}
516	else
517	rc = VERR_NO_MEMORY;
518
519	for (unsigned i = 0; i < cVolumes; i++)
520	RTUtf16Free(papwszVolumes[i]);
521
522	RTMemFree(papwszVolumes);
523	}
524	}
525
526	RTUtf16Free(pwszVolume);
527	}
528	}
529	else
530	rc = VERR_ALREADY_EXISTS;
531
532	return rc;
533	}
534
535	DECLHIDDEN(int) HBDMgrUnclaimBlockDevice(HBDMGR hHbdMgr, const char *pszFilename)
536	{
537	PHBDMGRINT pThis = hHbdMgr;
538	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
539
540	RTSemFastMutexRequest(pThis->hMtxList);
541	int rc = VINF_SUCCESS;
542	PHBDMGRDEV pDev = hbdMgrDevFindByName(pThis, pszFilename);
543	if (pDev)
544	hbdMgrDevUnclaim(pDev);
545	else
546	rc = VERR_NOT_FOUND;
547	RTSemFastMutexRelease(pThis->hMtxList);
548
549	return rc;
550	}
551
552	DECLHIDDEN(bool) HBDMgrIsBlockDeviceClaimed(HBDMGR hHbdMgr, const char *pszFilename)
553	{
554	PHBDMGRINT pThis = hHbdMgr;
555	AssertPtrReturn(pThis, false);
556
557	RTSemFastMutexRequest(pThis->hMtxList);
558	PHBDMGRDEV pIt = hbdMgrDevFindByName(pThis, pszFilename);
559	RTSemFastMutexRelease(pThis->hMtxList);
560
561	return pIt ? true : false;
562	}
563

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source: vbox/trunk/src/VBox/Devices/Storage/HBDMgmt-win.cpp@ 65819

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