dvmvfs.cpp@ 80346

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1	/* $Id: dvmvfs.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT Disk Volume Management API (DVM) - VFS glue.
4	*/
5
6	/*
7	* Copyright (C) 2012-2019 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 /** @todo fix log group */
32	#include <iprt/types.h>
33	#include <iprt/assert.h>
34	#include <iprt/mem.h>
35	#include <iprt/dvm.h>
36	#include <iprt/err.h>
37	#include <iprt/asm.h>
38	#include <iprt/string.h>
39	#include <iprt/file.h>
40	#include <iprt/sg.h>
41	#include <iprt/vfslowlevel.h>
42	#include <iprt/poll.h>
43	#include <iprt/log.h>
44	#include "internal/dvm.h"
45
46
47	/*********************************************************************************************************************************
48	* Structures and Typedefs *
49	*********************************************************************************************************************************/
50	/** Pointer to a volume manager VFS. */
51	typedef struct RTDVMVFSVOL *PRTDVMVFSVOL;
52
53	/**
54	* The internal data of a DVM volume I/O stream.
55	*/
56	typedef struct RTVFSDVMFILE
57	{
58	/** The volume the VFS file belongs to. */
59	RTDVMVOLUME hVol;
60	/** Pointer to the VFS volume. Can be NULL. */
61	PRTDVMVFSVOL pVfsVol;
62	/** Current position. */
63	uint64_t offCurPos;
64	/** Set if readable. */
65	bool fCanRead;
66	/** Set if writable. */
67	bool fCanWrite;
68	} RTVFSDVMFILE;
69	/** Pointer to a the internal data of a DVM volume file. */
70	typedef RTVFSDVMFILE *PRTVFSDVMFILE;
71
72	/**
73	* The internal data of a DVM volume symlink.
74	*/
75	typedef struct RTVFSDVMSYMLINK
76	{
77	/** The DVM volume the symlink represent. */
78	RTDVMVOLUME hVol;
79	/** The DVM volume manager @a hVol belongs to. */
80	RTDVM hVolMgr;
81	/** The symlink name. */
82	char *pszSymlink;
83	/** The symlink target (volXX). */
84	char szTarget[16];
85	} RTVFSDVMSYMLINK;
86	/** Pointer to a the internal data of a DVM volume file. */
87	typedef RTVFSDVMSYMLINK *PRTVFSDVMSYMLINK;
88
89	/**
90	* The volume manager VFS (root) dir data.
91	*/
92	typedef struct RTDVMVFSDIR
93	{
94	/** Pointer to the VFS volume. */
95	PRTDVMVFSVOL pVfsVol;
96	/** The current directory offset. */
97	uint32_t offDir;
98	/** Set if we need to try return hCurVolume again because of buffer overflow. */
99	bool fReturnCurrent;
100	/** Pointer to name alias string (returned by RTDvmVolumeQueryName, free it). */
101	char *pszNameAlias;
102	/** The current DVM volume. */
103	RTDVMVOLUME hCurVolume;
104	} RTDVMVFSDIR;
105	/** Pointer to a volume manager VFS (root) dir. */
106	typedef RTDVMVFSDIR *PRTDVMVFSDIR;
107
108	/**
109	* A volume manager VFS for use in chains (thing pseudo/devfs).
110	*/
111	typedef struct RTDVMVFSVOL
112	{
113	/** The volume manager. */
114	RTDVM hVolMgr;
115	/** Whether to close it on success. */
116	bool fCloseDvm;
117	/** Whether the access is read-only. */
118	bool fReadOnly;
119	/** Number of volumes. */
120	uint32_t cVolumes;
121	/** Self reference. */
122	RTVFS hVfsSelf;
123	} RTDVMVFSVOL;
124
125
126	/*********************************************************************************************************************************
127	* Internal Functions *
128	*********************************************************************************************************************************/
129	static DECLCALLBACK(int) rtDvmVfsVol_OpenRoot(void *pvThis, PRTVFSDIR phVfsDir);
130
131
132	/**
133	* @interface_method_impl{RTVFSOBJOPS,pfnClose}
134	*/
135	static DECLCALLBACK(int) rtDvmVfsFile_Close(void *pvThis)
136	{
137	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
138
139	RTDvmVolumeRelease(pThis->hVol);
140	return VINF_SUCCESS;
141	}
142
143
144	/**
145	* Worker for rtDvmVfsFile_QueryInfoWorker and rtDvmVfsSym_QueryInfoWorker.
146	*/
147	static int rtDvmVfsFileSym_QueryAddAttrWorker(RTDVMVOLUME hVolume, RTDVM hVolMgr,
148	PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
149	{
150	switch (enmAddAttr)
151	{
152	case RTFSOBJATTRADD_NOTHING:
153	case RTFSOBJATTRADD_UNIX:
154	pObjInfo->Attr.u.Unix.uid = (RTUID)RTDvmVolumeGetType(hVolume);
155	pObjInfo->Attr.u.Unix.gid = hVolMgr != NIL_RTDVM ? (RTGID)RTDvmMapGetFormatType(hVolMgr) : NIL_RTGID;
156	pObjInfo->Attr.u.Unix.cHardlinks = 1;
157	pObjInfo->Attr.u.Unix.INodeIdDevice = 0;
158	pObjInfo->Attr.u.Unix.INodeId = 0;
159	pObjInfo->Attr.u.Unix.fFlags = 0;
160	pObjInfo->Attr.u.Unix.GenerationId = 0;
161	pObjInfo->Attr.u.Unix.Device = 0;
162	break;
163
164	case RTFSOBJATTRADD_UNIX_OWNER:
165	{
166	RTDVMVOLTYPE enmType = RTDvmVolumeGetType(hVolume);
167	pObjInfo->Attr.u.UnixOwner.uid = (RTUID)enmType;
168	RTStrCopy(pObjInfo->Attr.u.UnixOwner.szName, sizeof(pObjInfo->Attr.u.UnixOwner.szName),
169	RTDvmVolumeTypeGetDescr(enmType));
170	break;
171	}
172
173	case RTFSOBJATTRADD_UNIX_GROUP:
174	if (hVolMgr != NIL_RTDVM)
175	{
176	pObjInfo->Attr.u.UnixGroup.gid = (RTGID)RTDvmMapGetFormatType(hVolMgr);
177	RTStrCopy(pObjInfo->Attr.u.UnixGroup.szName, sizeof(pObjInfo->Attr.u.UnixGroup.szName),
178	RTDvmMapGetFormatName(hVolMgr));
179	}
180	else
181	{
182	pObjInfo->Attr.u.UnixGroup.gid = NIL_RTGID;
183	pObjInfo->Attr.u.UnixGroup.szName[0] = '\0';
184	}
185	break;
186
187	case RTFSOBJATTRADD_EASIZE:
188	pObjInfo->Attr.u.EASize.cb = 0;
189	break;
190
191	default:
192	return VERR_INVALID_PARAMETER;
193	}
194	return VINF_SUCCESS;
195	}
196
197
198	/**
199	* Worker for rtDvmVfsFile_QueryInfo, rtDvmVfsDir_QueryEntryInfo, and
200	* rtDvmVfsDir_ReadDir.
201	*/
202	static int rtDvmVfsFile_QueryInfoWorker(RTDVMVOLUME hVolume, RTDVM hVolMgr, bool fReadOnly,
203	PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
204	{
205
206	pObjInfo->cbObject = RTDvmVolumeGetSize(hVolume);
207	pObjInfo->cbAllocated = pObjInfo->cbObject;
208	RTTimeSpecSetNano(&pObjInfo->AccessTime, 0);
209	RTTimeSpecSetNano(&pObjInfo->ModificationTime, 0);
210	RTTimeSpecSetNano(&pObjInfo->ChangeTime, 0);
211	RTTimeSpecSetNano(&pObjInfo->BirthTime, 0);
212	pObjInfo->Attr.fMode = RTFS_TYPE_FILE \| RTFS_DOS_NT_NORMAL;
213	if (fReadOnly)
214	pObjInfo->Attr.fMode \|= RTFS_DOS_READONLY \| 0444;
215	else
216	pObjInfo->Attr.fMode \|= 0666;
217
218	return rtDvmVfsFileSym_QueryAddAttrWorker(hVolume, hVolMgr, pObjInfo, enmAddAttr);
219	}
220
221
222	/**
223	* @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
224	*/
225	static DECLCALLBACK(int) rtDvmVfsFile_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
226	{
227	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
228	return rtDvmVfsFile_QueryInfoWorker(pThis->hVol,
229	pThis->pVfsVol ? pThis->pVfsVol->hVolMgr : NIL_RTDVM,
230	pThis->pVfsVol ? pThis->pVfsVol->fReadOnly : !pThis->fCanWrite,
231	pObjInfo, enmAddAttr);
232	}
233
234
235	/**
236	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnRead}
237	*/
238	static DECLCALLBACK(int) rtDvmVfsFile_Read(void pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t pcbRead)
239	{
240	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
241	int rc = VINF_SUCCESS;
242
243	Assert(pSgBuf->cSegs == 1);
244	NOREF(fBlocking);
245
246	/*
247	* Find the current position and check if it's within the volume.
248	*/
249	uint64_t offUnsigned = off < 0 ? pThis->offCurPos : (uint64_t)off;
250	if (offUnsigned >= RTDvmVolumeGetSize(pThis->hVol))
251	{
252	if (pcbRead)
253	{
254	*pcbRead = 0;
255	pThis->offCurPos = offUnsigned;
256	return VINF_EOF;
257	}
258	return VERR_EOF;
259	}
260
261	size_t cbLeftToRead;
262	if (offUnsigned + pSgBuf->paSegs[0].cbSeg > RTDvmVolumeGetSize(pThis->hVol))
263	{
264	if (!pcbRead)
265	return VERR_EOF;
266	*pcbRead = cbLeftToRead = (size_t)(RTDvmVolumeGetSize(pThis->hVol) - offUnsigned);
267	}
268	else
269	{
270	cbLeftToRead = pSgBuf->paSegs[0].cbSeg;
271	if (pcbRead)
272	*pcbRead = cbLeftToRead;
273	}
274
275	/*
276	* Ok, we've got a valid stretch within the file. Do the reading.
277	*/
278	if (cbLeftToRead > 0)
279	{
280	rc = RTDvmVolumeRead(pThis->hVol, offUnsigned, pSgBuf->paSegs[0].pvSeg, cbLeftToRead);
281	if (RT_SUCCESS(rc))
282	offUnsigned += cbLeftToRead;
283	}
284
285	pThis->offCurPos = offUnsigned;
286	return rc;
287	}
288
289
290	/**
291	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnWrite}
292	*/
293	static DECLCALLBACK(int) rtDvmVfsFile_Write(void pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t pcbWritten)
294	{
295	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
296	int rc = VINF_SUCCESS;
297
298	Assert(pSgBuf->cSegs == 1);
299	NOREF(fBlocking);
300
301	/*
302	* Find the current position and check if it's within the volume.
303	* Writing beyond the end of a volume is not supported.
304	*/
305	uint64_t offUnsigned = off < 0 ? pThis->offCurPos : (uint64_t)off;
306	if (offUnsigned >= RTDvmVolumeGetSize(pThis->hVol))
307	{
308	if (pcbWritten)
309	{
310	*pcbWritten = 0;
311	pThis->offCurPos = offUnsigned;
312	}
313	return VERR_NOT_SUPPORTED;
314	}
315
316	size_t cbLeftToWrite;
317	if (offUnsigned + pSgBuf->paSegs[0].cbSeg > RTDvmVolumeGetSize(pThis->hVol))
318	{
319	if (!pcbWritten)
320	return VERR_EOF;
321	*pcbWritten = cbLeftToWrite = (size_t)(RTDvmVolumeGetSize(pThis->hVol) - offUnsigned);
322	}
323	else
324	{
325	cbLeftToWrite = pSgBuf->paSegs[0].cbSeg;
326	if (pcbWritten)
327	*pcbWritten = cbLeftToWrite;
328	}
329
330	/*
331	* Ok, we've got a valid stretch within the file. Do the reading.
332	*/
333	if (cbLeftToWrite > 0)
334	{
335	rc = RTDvmVolumeWrite(pThis->hVol, offUnsigned, pSgBuf->paSegs[0].pvSeg, cbLeftToWrite);
336	if (RT_SUCCESS(rc))
337	offUnsigned += cbLeftToWrite;
338	}
339
340	pThis->offCurPos = offUnsigned;
341	return rc;
342	}
343
344
345	/**
346	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnFlush}
347	*/
348	static DECLCALLBACK(int) rtDvmVfsFile_Flush(void *pvThis)
349	{
350	NOREF(pvThis);
351	return VINF_SUCCESS; /** @todo Implement missing DVM API. */
352	}
353
354
355	/**
356	* @interface_method_impl{RTVFSIOSTREAMOPS,pfnTell}
357	*/
358	static DECLCALLBACK(int) rtDvmVfsFile_Tell(void *pvThis, PRTFOFF poffActual)
359	{
360	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
361	*poffActual = pThis->offCurPos;
362	return VINF_SUCCESS;
363	}
364
365
366	/**
367	* @interface_method_impl{RTVFSOBJSETOPS,pfnMode}
368	*/
369	static DECLCALLBACK(int) rtDvmVfsFile_SetMode(void *pvThis, RTFMODE fMode, RTFMODE fMask)
370	{
371	NOREF(pvThis);
372	NOREF(fMode);
373	NOREF(fMask);
374	return VERR_NOT_SUPPORTED;
375	}
376
377
378	/**
379	* @interface_method_impl{RTVFSOBJSETOPS,pfnSetTimes}
380	*/
381	static DECLCALLBACK(int) rtDvmVfsFile_SetTimes(void *pvThis, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
382	PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
383	{
384	NOREF(pvThis);
385	NOREF(pAccessTime);
386	NOREF(pModificationTime);
387	NOREF(pChangeTime);
388	NOREF(pBirthTime);
389	return VERR_NOT_SUPPORTED;
390	}
391
392
393	/**
394	* @interface_method_impl{RTVFSOBJSETOPS,pfnSetOwner}
395	*/
396	static DECLCALLBACK(int) rtDvmVfsFile_SetOwner(void *pvThis, RTUID uid, RTGID gid)
397	{
398	NOREF(pvThis);
399	NOREF(uid);
400	NOREF(gid);
401	return VERR_NOT_SUPPORTED;
402	}
403
404
405	/**
406	* @interface_method_impl{RTVFSFILEOPS,pfnSeek}
407	*/
408	static DECLCALLBACK(int) rtDvmVfsFile_Seek(void *pvThis, RTFOFF offSeek, unsigned uMethod, PRTFOFF poffActual)
409	{
410	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
411
412	/*
413	* Seek relative to which position.
414	*/
415	uint64_t offWrt;
416	switch (uMethod)
417	{
418	case RTFILE_SEEK_BEGIN:
419	offWrt = 0;
420	break;
421
422	case RTFILE_SEEK_CURRENT:
423	offWrt = pThis->offCurPos;
424	break;
425
426	case RTFILE_SEEK_END:
427	offWrt = RTDvmVolumeGetSize(pThis->hVol);
428	break;
429
430	default:
431	return VERR_INTERNAL_ERROR_5;
432	}
433
434	/*
435	* Calc new position, take care to stay within bounds.
436	*
437	* @todo: Setting position beyond the end of the volume does not make sense.
438	*/
439	uint64_t offNew;
440	if (offSeek == 0)
441	offNew = offWrt;
442	else if (offSeek > 0)
443	{
444	offNew = offWrt + offSeek;
445	if ( offNew < offWrt
446	\|\| offNew > RTFOFF_MAX)
447	offNew = RTFOFF_MAX;
448	}
449	else if ((uint64_t)-offSeek < offWrt)
450	offNew = offWrt + offSeek;
451	else
452	offNew = 0;
453
454	/*
455	* Update the state and set return value.
456	*/
457	pThis->offCurPos = offNew;
458
459	*poffActual = offNew;
460	return VINF_SUCCESS;
461	}
462
463
464	/**
465	* @interface_method_impl{RTVFSFILEOPS,pfnQuerySize}
466	*/
467	static DECLCALLBACK(int) rtDvmVfsFile_QuerySize(void pvThis, uint64_t pcbFile)
468	{
469	PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis;
470	*pcbFile = RTDvmVolumeGetSize(pThis->hVol);
471	return VINF_SUCCESS;
472	}
473
474
475	/**
476	* Standard file operations.
477	*/
478	DECL_HIDDEN_CONST(const RTVFSFILEOPS) g_rtDvmVfsStdFileOps =
479	{
480	{ /* Stream */
481	{ /* Obj */
482	RTVFSOBJOPS_VERSION,
483	RTVFSOBJTYPE_FILE,
484	"DvmFile",
485	rtDvmVfsFile_Close,
486	rtDvmVfsFile_QueryInfo,
487	RTVFSOBJOPS_VERSION
488	},
489	RTVFSIOSTREAMOPS_VERSION,
490	RTVFSIOSTREAMOPS_FEAT_NO_SG,
491	rtDvmVfsFile_Read,
492	rtDvmVfsFile_Write,
493	rtDvmVfsFile_Flush,
494	NULL /pfnPollOne/,
495	rtDvmVfsFile_Tell,
496	NULL /Skip/,
497	NULL /ZeroFill/,
498	RTVFSIOSTREAMOPS_VERSION,
499	},
500	RTVFSFILEOPS_VERSION,
501	/RTVFSIOFILEOPS_FEAT_NO_AT_OFFSET/ 0,
502	{ /* ObjSet */
503	RTVFSOBJSETOPS_VERSION,
504	RT_UOFFSETOF(RTVFSFILEOPS, ObjSet) - RT_UOFFSETOF(RTVFSFILEOPS, Stream.Obj),
505	rtDvmVfsFile_SetMode,
506	rtDvmVfsFile_SetTimes,
507	rtDvmVfsFile_SetOwner,
508	RTVFSOBJSETOPS_VERSION
509	},
510	rtDvmVfsFile_Seek,
511	rtDvmVfsFile_QuerySize,
512	NULL /SetSize/,
513	NULL /QueryMaxSize/,
514	RTVFSFILEOPS_VERSION
515	};
516
517
518	/**
519	* Internal worker for RTDvmVolumeCreateVfsFile and rtDvmVfsDir_OpenFile.
520	*
521	* @returns IPRT status code.
522	* @param pVfsVol The VFS volume, optional.
523	* @param hVol The volume handle. (Reference not consumed.)
524	* @param fOpen RTFILE_O_XXX (valid).
525	* @param phVfsFileOut Where to return the handle to the file.
526	*/
527	static int rtDvmVfsCreateFileForVolume(PRTDVMVFSVOL pVfsVol, RTDVMVOLUME hVol, uint64_t fOpen, PRTVFSFILE phVfsFileOut)
528	{
529	uint32_t cRefs = RTDvmVolumeRetain(hVol);
530	AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE);
531
532	/*
533	* Create the volume file.
534	*/
535	RTVFSFILE hVfsFile;
536	PRTVFSDVMFILE pThis;
537	int rc = RTVfsNewFile(&g_rtDvmVfsStdFileOps, sizeof(pThis), fOpen, NIL_RTVFS, NIL_RTVFSLOCK, &hVfsFile, (void *)&pThis);
538	if (RT_SUCCESS(rc))
539	{
540	pThis->offCurPos = 0;
541	pThis->hVol = hVol;
542	pThis->fCanRead = RT_BOOL(fOpen & RTFILE_O_READ);
543	pThis->fCanWrite = RT_BOOL(fOpen & RTFILE_O_WRITE);
544	pThis->pVfsVol = pVfsVol;
545
546	*phVfsFileOut = hVfsFile;
547	return VINF_SUCCESS;
548	}
549
550	RTDvmVolumeRelease(hVol);
551	return rc;
552	}
553
554
555	RTDECL(int) RTDvmVolumeCreateVfsFile(RTDVMVOLUME hVol, uint64_t fOpen, PRTVFSFILE phVfsFileOut)
556	{
557	AssertPtrReturn(hVol, VERR_INVALID_HANDLE);
558	AssertPtrReturn(phVfsFileOut, VERR_INVALID_POINTER);
559	AssertReturn(fOpen & RTFILE_O_ACCESS_MASK, VERR_INVALID_FLAGS);
560	AssertReturn(!(fOpen & ~RTFILE_O_VALID_MASK), VERR_INVALID_FLAGS);
561	return rtDvmVfsCreateFileForVolume(NULL, hVol, fOpen, phVfsFileOut);
562	}
563
564
565	/*********************************************************************************************************************************
566	* DVM Symbolic Link Objects *
567	*********************************************************************************************************************************/
568	/**
569	* @interface_method_impl{RTVFSOBJOPS,pfnClose}
570	*/
571	static DECLCALLBACK(int) rtDvmVfsSym_Close(void *pvThis)
572	{
573	PRTVFSDVMSYMLINK pThis = (PRTVFSDVMSYMLINK)pvThis;
574	if (pThis->pszSymlink)
575	{
576	RTStrFree(pThis->pszSymlink);
577	pThis->pszSymlink = NULL;
578	}
579	if (pThis->hVol != NIL_RTDVMVOLUME)
580	{
581	RTDvmVolumeRelease(pThis->hVol);
582	pThis->hVol = NIL_RTDVMVOLUME;
583	}
584	if (pThis->hVolMgr != NIL_RTDVM)
585	{
586	RTDvmRelease(pThis->hVolMgr);
587	pThis->hVolMgr = NIL_RTDVM;
588	}
589	return VINF_SUCCESS;
590	}
591
592
593	/**
594	* Worker for rtDvmVfsSym_QueryInfo and rtDvmVfsDir_Read.
595	*
596	* @returns IPRT status code.
597	* @param hVolume The volume handle.
598	* @param hVolMgr The volume manager handle. Optional.
599	* @param pszTarget The link target.
600	* @param pObjInfo The object info structure to populate.
601	* @param enmAddAttr The additional attributes to supply.
602	*/
603	static int rtDvmVfsSym_QueryInfoWorker(RTDVMVOLUME hVolume, RTDVM hVolMgr, const char *pszTarget,
604	PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
605	{
606	RT_ZERO(*pObjInfo);
607	pObjInfo->cbObject = pObjInfo->cbAllocated = pszTarget ? strlen(pszTarget) : 0;
608	pObjInfo->Attr.fMode = 0777 \| RTFS_TYPE_SYMLINK \| RTFS_DOS_NT_REPARSE_POINT;
609
610	return rtDvmVfsFileSym_QueryAddAttrWorker(hVolume, hVolMgr, pObjInfo, enmAddAttr);
611	}
612
613
614	/**
615	* @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
616	*/
617	static DECLCALLBACK(int) rtDvmVfsSym_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
618	{
619	PRTVFSDVMSYMLINK pThis = (PRTVFSDVMSYMLINK)pvThis;
620	return rtDvmVfsSym_QueryInfoWorker(pThis->hVol, pThis->hVolMgr, pThis->szTarget, pObjInfo, enmAddAttr);
621	}
622
623
624	/**
625	* @interface_method_impl{RTVFSSYMLINKOPS,pfnRead}
626	*/
627	static DECLCALLBACK(int) rtDvmVfsSym_Read(void pvThis, char pszTarget, size_t cbTarget)
628	{
629	PRTVFSDVMSYMLINK pThis = (PRTVFSDVMSYMLINK)pvThis;
630	return RTStrCopy(pszTarget, cbTarget, pThis->szTarget);
631	}
632
633
634	/**
635	* DVM symbolic link operations.
636	*/
637	static const RTVFSSYMLINKOPS g_rtDvmVfsSymOps =
638	{
639	{ /* Obj */
640	RTVFSOBJOPS_VERSION,
641	RTVFSOBJTYPE_SYMLINK,
642	"DvmSymlink",
643	rtDvmVfsSym_Close,
644	rtDvmVfsSym_QueryInfo,
645	RTVFSOBJOPS_VERSION
646	},
647	RTVFSSYMLINKOPS_VERSION,
648	0,
649	{ /* ObjSet */
650	RTVFSOBJSETOPS_VERSION,
651	RT_UOFFSETOF(RTVFSSYMLINKOPS, ObjSet) - RT_UOFFSETOF(RTVFSSYMLINKOPS, Obj),
652	NULL /rtDvmVfsSym_SetMode/,
653	NULL /rtDvmVfsSym_SetTimes/,
654	NULL /rtDvmVfsSym_SetOwner/,
655	RTVFSOBJSETOPS_VERSION
656	},
657	rtDvmVfsSym_Read,
658	RTVFSSYMLINKOPS_VERSION
659	};
660
661
662	/**
663	* Internal worker for rtDvmVfsDir_OpenFile.
664	*
665	* @returns IPRT status code.
666	* @param hVol The volume handle (not consumed).
667	* @param hVolMgr The volume manager handle (not consumed).
668	* @param iVol The volume number.
669	* @param pszSymlink The volume name. Consumed on success.
670	* @param phVfsSymlinkOut Where to return the handle to the file.
671	*/
672	static int rtDvmVfsCreateSymlinkForVolume(RTDVMVOLUME hVol, RTDVM hVolMgr, uint32_t iVol, char *pszSymlink,
673	PRTVFSSYMLINK phVfsSymlinkOut)
674	{
675	uint32_t cRefs = RTDvmVolumeRetain(hVol);
676	AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE);
677
678	cRefs = RTDvmRetain(hVolMgr);
679	AssertReturnStmt(cRefs != UINT32_MAX, RTDvmVolumeRelease(hVol), VERR_INVALID_HANDLE);
680
681	/*
682	* Create the symlink.
683	*/
684	RTVFSSYMLINK hVfsSym;
685	PRTVFSDVMSYMLINK pThis;
686	int rc = RTVfsNewSymlink(&g_rtDvmVfsSymOps, sizeof(pThis), NIL_RTVFS, NIL_RTVFSLOCK, &hVfsSym, (void *)&pThis);
687	if (RT_SUCCESS(rc))
688	{
689	pThis->hVol = hVol;
690	pThis->hVolMgr = hVolMgr;
691	pThis->pszSymlink = pszSymlink;
692	RTStrPrintf(pThis->szTarget, sizeof(pThis->szTarget), "vol%u", iVol);
693
694	*phVfsSymlinkOut = hVfsSym;
695	return VINF_SUCCESS;
696	}
697	RTDvmRelease(hVolMgr);
698	RTDvmVolumeRelease(hVol);
699	return rc;
700	}
701
702
703
704	/*********************************************************************************************************************************
705	* DVM Directory Objects *
706	*********************************************************************************************************************************/
707
708	/**
709	* @interface_method_impl{RTVFSOBJOPS,pfnClose}
710	*/
711	static DECLCALLBACK(int) rtDvmVfsDir_Close(void *pvThis)
712	{
713	PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis;
714
715	if (pThis->hCurVolume != NIL_RTDVMVOLUME)
716	{
717	RTDvmVolumeRelease(pThis->hCurVolume);
718	pThis->hCurVolume = NIL_RTDVMVOLUME;
719	}
720
721	if (pThis->pszNameAlias)
722	{
723	RTStrFree(pThis->pszNameAlias);
724	pThis->pszNameAlias = NULL;
725	}
726
727	pThis->pVfsVol = NULL;
728
729	return VINF_SUCCESS;
730	}
731
732
733	/**
734	* @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
735	*/
736	static DECLCALLBACK(int) rtDvmVfsDir_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
737	{
738	PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis;
739	pObjInfo->cbObject = pThis->pVfsVol->cVolumes;
740	pObjInfo->cbAllocated = pThis->pVfsVol->cVolumes;
741	RTTimeSpecSetNano(&pObjInfo->AccessTime, 0);
742	RTTimeSpecSetNano(&pObjInfo->ModificationTime, 0);
743	RTTimeSpecSetNano(&pObjInfo->ChangeTime, 0);
744	RTTimeSpecSetNano(&pObjInfo->BirthTime, 0);
745	pObjInfo->Attr.fMode = RTFS_TYPE_DIRECTORY \| RTFS_DOS_DIRECTORY;
746	if (pThis->pVfsVol->fReadOnly)
747	pObjInfo->Attr.fMode \|= RTFS_DOS_READONLY \| 0555;
748	else
749	pObjInfo->Attr.fMode \|= 0777;
750
751	switch (enmAddAttr)
752	{
753	case RTFSOBJATTRADD_NOTHING:
754	case RTFSOBJATTRADD_UNIX:
755	pObjInfo->Attr.u.Unix.uid = NIL_RTUID;
756	pObjInfo->Attr.u.Unix.gid = (RTGID)RTDvmMapGetFormatType(pThis->pVfsVol->hVolMgr);
757	pObjInfo->Attr.u.Unix.cHardlinks = pThis->pVfsVol->cVolumes;
758	pObjInfo->Attr.u.Unix.INodeIdDevice = 0;
759	pObjInfo->Attr.u.Unix.INodeId = 0;
760	pObjInfo->Attr.u.Unix.fFlags = 0;
761	pObjInfo->Attr.u.Unix.GenerationId = 0;
762	pObjInfo->Attr.u.Unix.Device = 0;
763	break;
764
765	case RTFSOBJATTRADD_UNIX_OWNER:
766	pObjInfo->Attr.u.UnixOwner.uid = NIL_RTUID;
767	pObjInfo->Attr.u.UnixOwner.szName[0] = '\0';
768	break;
769
770	case RTFSOBJATTRADD_UNIX_GROUP:
771	pObjInfo->Attr.u.UnixGroup.gid = (RTGID)RTDvmMapGetFormatType(pThis->pVfsVol->hVolMgr);
772	RTStrCopy(pObjInfo->Attr.u.UnixGroup.szName, sizeof(pObjInfo->Attr.u.UnixGroup.szName),
773	RTDvmMapGetFormatName(pThis->pVfsVol->hVolMgr));
774	break;
775
776	case RTFSOBJATTRADD_EASIZE:
777	pObjInfo->Attr.u.EASize.cb = 0;
778	break;
779
780	default:
781	return VERR_INVALID_PARAMETER;
782	}
783	return VINF_SUCCESS;
784	}
785
786
787	/**
788	* @interface_method_impl{RTVFSOBJSETOPS,pfnMode}
789	*/
790	static DECLCALLBACK(int) rtDvmVfsDir_SetMode(void *pvThis, RTFMODE fMode, RTFMODE fMask)
791	{
792	NOREF(pvThis); NOREF(fMode); NOREF(fMask);
793	return VERR_NOT_SUPPORTED;
794	}
795
796
797	/**
798	* @interface_method_impl{RTVFSOBJSETOPS,pfnSetTimes}
799	*/
800	static DECLCALLBACK(int) rtDvmVfsDir_SetTimes(void *pvThis, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
801	PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
802	{
803	NOREF(pvThis); NOREF(pAccessTime); NOREF(pModificationTime); NOREF(pChangeTime); NOREF(pBirthTime);
804	return VERR_NOT_SUPPORTED;
805	}
806
807
808	/**
809	* @interface_method_impl{RTVFSOBJSETOPS,pfnSetOwner}
810	*/
811	static DECLCALLBACK(int) rtDvmVfsDir_SetOwner(void *pvThis, RTUID uid, RTGID gid)
812	{
813	RT_NOREF(pvThis, uid, gid);
814	return VERR_NOT_SUPPORTED;
815	}
816
817
818	static int rtDvmVfsDir_FindEntry(PRTDVMVFSDIR pThis, const char *pszEntry,
819	PRTDVMVOLUME phVolume, uint32_t piVol, char *ppszSymlink)
820	{
821	*phVolume = NIL_RTDVMVOLUME;
822	*ppszSymlink = NULL;
823	*piVol = UINT32_MAX;
824
825	/*
826	* Enumerate the volumes and try match the volume name.
827	*/
828	int rc;
829	PRTDVMVFSVOL pVfsVol = pThis->pVfsVol;
830	if (pVfsVol->cVolumes > 0)
831	{
832	/* The first volume. */
833	uint32_t iVol = 0;
834	RTDVMVOLUME hVol;
835	rc = RTDvmMapQueryFirstVolume(pThis->pVfsVol->hVolMgr, &hVol);
836	while (RT_SUCCESS(rc))
837	{
838	/* Match the name. */
839	bool fMatch;
840	char *pszVolName;
841	rc = RTDvmVolumeQueryName(hVol, &pszVolName);
842	if (RT_SUCCESS(rc))
843	{
844	fMatch = RTStrCmp(pszEntry, pszVolName) == 0 && *pszVolName != '\0';
845	if (fMatch)
846	{
847	*phVolume = hVol;
848	*ppszSymlink = pszVolName;
849	*piVol = iVol;
850	return VINF_SUCCESS;
851	}
852	RTStrFree(pszVolName);
853	}
854	else if (rc == VERR_NOT_SUPPORTED)
855	fMatch = false;
856	else
857	{
858	RTDvmVolumeRelease(hVol);
859	break;
860	}
861
862	/* Match the sequential volume number. */
863	if (!fMatch)
864	{
865	char szTmp[16];
866	RTStrPrintf(szTmp, sizeof(szTmp), "vol%u", iVol);
867	fMatch = RTStrCmp(pszEntry, szTmp) == 0;
868	}
869
870	if (fMatch)
871	{
872	*phVolume = hVol;
873	*piVol = iVol;
874	return VINF_SUCCESS;
875	}
876
877	/* More volumes? */
878	iVol++;
879	if (iVol >= pVfsVol->cVolumes)
880	{
881	RTDvmVolumeRelease(hVol);
882	rc = VERR_FILE_NOT_FOUND;
883	break;
884	}
885
886	/* Get the next volume. */
887	RTDVMVOLUME hVolNext;
888	rc = RTDvmMapQueryNextVolume(pThis->pVfsVol->hVolMgr, hVol, &hVolNext);
889	RTDvmVolumeRelease(hVol);
890	hVol = hVolNext;
891	}
892	}
893	else
894	rc = VERR_FILE_NOT_FOUND;
895	return rc;
896	}
897
898
899	/**
900	* @interface_method_impl{RTVFSDIROPS,pfnOpen}
901	*/
902	static DECLCALLBACK(int) rtDvmVfsDir_Open(void pvThis, const char pszEntry, uint64_t fOpen, uint32_t fFlags, PRTVFSOBJ phVfsObj)
903	{
904	PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis;
905
906	/*
907	* Special case: '.' and '..'
908	*/
909	if ( pszEntry[0] == '.'
910	&& ( pszEntry[1] == '\0'
911	\|\| ( pszEntry[1] == '.'
912	&& pszEntry[2] == '\0')))
913	{
914	if ( (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN
915	\|\| (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE
916	\|\| (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_CREATE_REPLACE)
917	{
918	if (fFlags & RTVFSOBJ_F_OPEN_DIRECTORY)
919	{
920	RTVFSDIR hVfsDir;
921	int rc = rtDvmVfsVol_OpenRoot(pThis->pVfsVol, &hVfsDir);
922	if (RT_SUCCESS(rc))
923	{
924	*phVfsObj = RTVfsObjFromDir(hVfsDir);
925	RTVfsDirRelease(hVfsDir);
926	AssertStmt(*phVfsObj != NIL_RTVFSOBJ, rc = VERR_INTERNAL_ERROR_3);
927	}
928	return rc;
929	}
930	return VERR_IS_A_DIRECTORY;
931	}
932	return VERR_ACCESS_DENIED;
933	}
934
935	/*
936	* Open volume file.
937	*/
938	RTDVMVOLUME hVolume = NIL_RTDVMVOLUME;
939	uint32_t iVol = 0;
940	char *pszSymlink = NULL;
941	int rc = rtDvmVfsDir_FindEntry(pThis, pszEntry, &hVolume, &iVol, &pszSymlink);
942	if (RT_SUCCESS(rc))
943	{
944	if ( (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN
945	\|\| (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE
946	\|\| (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_CREATE_REPLACE)
947	{
948	if (fFlags & (RTVFSOBJ_F_OPEN_FILE \| RTVFSOBJ_F_OPEN_DEV_BLOCK))
949	{
950	if (!pszSymlink)
951	{
952	if ( !(fOpen & RTFILE_O_WRITE)
953	\|\| !pThis->pVfsVol->fReadOnly)
954	{
955	/* Create file object. */
956	RTVFSFILE hVfsFile;
957	rc = rtDvmVfsCreateFileForVolume(pThis->pVfsVol, hVolume, fOpen, &hVfsFile);
958	if (RT_SUCCESS(rc))
959	{
960	*phVfsObj = RTVfsObjFromFile(hVfsFile);
961	RTVfsFileRelease(hVfsFile);
962	AssertStmt(*phVfsObj != NIL_RTVFSOBJ, rc = VERR_INTERNAL_ERROR_3);
963	}
964	}
965	else
966	rc = VERR_WRITE_PROTECT;
967	}
968	else
969	rc = VERR_IS_A_SYMLINK;
970	}
971	else if (fFlags & RTVFSOBJ_F_OPEN_SYMLINK)
972	{
973	/* Create symlink object */
974	RTVFSSYMLINK hVfsSym = NIL_RTVFSSYMLINK; /* (older gcc maybe used uninitialized) */
975	rc = rtDvmVfsCreateSymlinkForVolume(hVolume, pThis->pVfsVol ? pThis->pVfsVol->hVolMgr : NIL_RTDVM, iVol,
976	pszSymlink, &hVfsSym);
977	if (RT_SUCCESS(rc))
978	{
979	*phVfsObj = RTVfsObjFromSymlink(hVfsSym);
980	RTVfsSymlinkRelease(hVfsSym);
981	AssertStmt(*phVfsObj != NIL_RTVFSOBJ, rc = VERR_INTERNAL_ERROR_3);
982	pszSymlink = NULL;
983	}
984	}
985	else
986	rc = VERR_IS_A_FILE;
987	}
988	else
989	rc = VERR_ALREADY_EXISTS;
990	RTDvmVolumeRelease(hVolume);
991	if (pszSymlink)
992	RTStrFree(pszSymlink);
993	}
994	return rc;
995	}
996
997
998	/**
999	* @interface_method_impl{RTVFSDIROPS,pfnOpenFile}
1000	*/
1001	static DECLCALLBACK(int) rtDvmVfsDir_OpenFile(void pvThis, const char pszFilename, uint64_t fOpen, PRTVFSFILE phVfsFile)
1002	{
1003	RTVFSOBJ hVfsObj;
1004	int rc = rtDvmVfsDir_Open(pvThis, pszFilename, fOpen, RTVFSOBJ_F_OPEN_FILE, &hVfsObj);
1005	if (RT_SUCCESS(rc))
1006	{
1007	*phVfsFile = RTVfsObjToFile(hVfsObj);
1008	RTVfsObjRelease(hVfsObj);
1009	}
1010	return rc;
1011	}
1012
1013
1014	/**
1015	* @interface_method_impl{RTVFSDIROPS,pfnCreateDir}
1016	*/
1017	static DECLCALLBACK(int) rtDvmVfsDir_CreateDir(void pvThis, const char pszSubDir, RTFMODE fMode, PRTVFSDIR phVfsDir)
1018	{
1019	RT_NOREF(pvThis, pszSubDir, fMode, phVfsDir);
1020	return VERR_NOT_SUPPORTED;
1021	}
1022
1023
1024	/**
1025	* @interface_method_impl{RTVFSDIROPS,pfnOpenSymlink}
1026	*/
1027	static DECLCALLBACK(int) rtDvmVfsDir_OpenSymlink(void pvThis, const char pszSymlink, PRTVFSSYMLINK phVfsSymlink)
1028	{
1029	RT_NOREF(pvThis, pszSymlink, phVfsSymlink);
1030	return VERR_NOT_SUPPORTED;
1031	}
1032
1033
1034	/**
1035	* @interface_method_impl{RTVFSDIROPS,pfnCreateSymlink}
1036	*/
1037	static DECLCALLBACK(int) rtDvmVfsDir_CreateSymlink(void pvThis, const char pszSymlink, const char *pszTarget,
1038	RTSYMLINKTYPE enmType, PRTVFSSYMLINK phVfsSymlink)
1039	{
1040	RT_NOREF(pvThis, pszSymlink, pszTarget, enmType, phVfsSymlink);
1041	return VERR_NOT_SUPPORTED;
1042	}
1043
1044
1045	/**
1046	* @interface_method_impl{RTVFSDIROPS,pfnUnlinkEntry}
1047	*/
1048	static DECLCALLBACK(int) rtDvmVfsDir_UnlinkEntry(void pvThis, const char pszEntry, RTFMODE fType)
1049	{
1050	RT_NOREF(pvThis, pszEntry, fType);
1051	return VERR_NOT_IMPLEMENTED;
1052	}
1053
1054
1055	/**
1056	* @interface_method_impl{RTVFSDIROPS,pfnRenameEntry}
1057	*/
1058	static DECLCALLBACK(int) rtDvmVfsDir_RenameEntry(void pvThis, const char pszEntry, RTFMODE fType, const char *pszNewName)
1059	{
1060	RT_NOREF(pvThis, pszEntry, fType, pszNewName);
1061	return VERR_NOT_IMPLEMENTED;
1062	}
1063
1064
1065	/**
1066	* @interface_method_impl{RTVFSDIROPS,pfnRewindDir}
1067	*/
1068	static DECLCALLBACK(int) rtDvmVfsDir_RewindDir(void *pvThis)
1069	{
1070	PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis;
1071
1072	if (pThis->hCurVolume != NIL_RTDVMVOLUME)
1073	{
1074	RTDvmVolumeRelease(pThis->hCurVolume);
1075	pThis->hCurVolume = NIL_RTDVMVOLUME;
1076	}
1077	pThis->fReturnCurrent = false;
1078	pThis->offDir = 0;
1079	if (pThis->pszNameAlias)
1080	{
1081	RTStrFree(pThis->pszNameAlias);
1082	pThis->pszNameAlias = NULL;
1083	}
1084
1085	return VINF_SUCCESS;
1086	}
1087
1088
1089	/**
1090	* @interface_method_impl{RTVFSDIROPS,pfnReadDir}
1091	*/
1092	static DECLCALLBACK(int) rtDvmVfsDir_ReadDir(void pvThis, PRTDIRENTRYEX pDirEntry, size_t pcbDirEntry,
1093	RTFSOBJATTRADD enmAddAttr)
1094	{
1095	PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis;
1096	PRTDVMVFSVOL pVfsVol = pThis->pVfsVol;
1097	int rc;
1098
1099	/*
1100	* Format the volume name since we'll be needing it all but the final call.
1101	*/
1102	char szVolNo[16];
1103	size_t const cchVolNo = RTStrPrintf(szVolNo, sizeof(szVolNo), "vol%u", pThis->offDir);
1104
1105	if (!pThis->fReturnCurrent)
1106	{
1107	/*
1108	* Do we have a pending name alias to return?
1109	*/
1110	if (pThis->pszNameAlias)
1111	{
1112	size_t cchNameAlias = strlen(pThis->pszNameAlias);
1113	size_t cbNeeded = RT_UOFFSETOF_DYN(RTDIRENTRYEX, szName[cchNameAlias + 1]);
1114	if (cbNeeded <= *pcbDirEntry)
1115	{
1116	*pcbDirEntry = cbNeeded;
1117
1118	/* Do the names. */
1119	pDirEntry->cbName = (uint16_t)cchNameAlias;
1120	memcpy(pDirEntry->szName, pThis->pszNameAlias, cchNameAlias + 1);
1121	pDirEntry->cwcShortName = 0;
1122	pDirEntry->wszShortName[0] = '\0';
1123
1124
1125	/* Do the rest. */
1126	rc = rtDvmVfsSym_QueryInfoWorker(pThis->hCurVolume, pVfsVol->hVolMgr, szVolNo, &pDirEntry->Info, enmAddAttr);
1127	if (RT_SUCCESS(rc))
1128	{
1129	RTStrFree(pThis->pszNameAlias);
1130	pThis->pszNameAlias = NULL;
1131	pThis->offDir += 1;
1132	}
1133	return rc;
1134	}
1135
1136	*pcbDirEntry = cbNeeded;
1137	return VERR_BUFFER_OVERFLOW;
1138	}
1139
1140	/*
1141	* Get the next volume to return info about.
1142	*/
1143	if (pThis->offDir < pVfsVol->cVolumes)
1144	{
1145	RTDVMVOLUME hNextVolume;
1146	if (pThis->offDir == 0)
1147	rc = RTDvmMapQueryFirstVolume(pVfsVol->hVolMgr, &hNextVolume);
1148	else
1149	rc = RTDvmMapQueryNextVolume(pVfsVol->hVolMgr, pThis->hCurVolume, &hNextVolume);
1150	if (RT_FAILURE(rc))
1151	return rc;
1152	RTDvmVolumeRelease(pThis->hCurVolume);
1153	pThis->hCurVolume = hNextVolume;
1154
1155	/* Check if we need to return a name alias later. */
1156	rc = RTDvmVolumeQueryName(pThis->hCurVolume, &pThis->pszNameAlias);
1157	if (RT_FAILURE(rc))
1158	pThis->pszNameAlias = NULL;
1159	else if (*pThis->pszNameAlias == '\0')
1160	{
1161	RTStrFree(pThis->pszNameAlias);
1162	pThis->pszNameAlias = NULL;
1163	}
1164	}
1165	else
1166	{
1167	RTDvmVolumeRelease(pThis->hCurVolume);
1168	pThis->hCurVolume = NIL_RTDVMVOLUME;
1169	return VERR_NO_MORE_FILES;
1170	}
1171	}
1172
1173	/*
1174	* Figure out the name length.
1175	*/
1176	size_t cbNeeded = RT_UOFFSETOF_DYN(RTDIRENTRYEX, szName[cchVolNo + 1]);
1177	if (cbNeeded <= *pcbDirEntry)
1178	{
1179	*pcbDirEntry = cbNeeded;
1180
1181	/* Do the names. */
1182	pDirEntry->cbName = (uint16_t)cchVolNo;
1183	memcpy(pDirEntry->szName, szVolNo, cchVolNo + 1);
1184	pDirEntry->cwcShortName = 0;
1185	pDirEntry->wszShortName[0] = '\0';
1186
1187	/* Do the rest. */
1188	rc = rtDvmVfsFile_QueryInfoWorker(pThis->hCurVolume, pVfsVol->hVolMgr, pVfsVol->fReadOnly, &pDirEntry->Info, enmAddAttr);
1189	if (RT_SUCCESS(rc))
1190	{
1191	pThis->fReturnCurrent = false;
1192	if (!pThis->pszNameAlias)
1193	pThis->offDir += 1;
1194	return rc;
1195	}
1196	}
1197	else
1198	{
1199	*pcbDirEntry = cbNeeded;
1200	rc = VERR_BUFFER_OVERFLOW;
1201	}
1202	pThis->fReturnCurrent = true;
1203	return rc;
1204	}
1205
1206
1207	/**
1208	* DVM (root) directory operations.
1209	*/
1210	static const RTVFSDIROPS g_rtDvmVfsDirOps =
1211	{
1212	{ /* Obj */
1213	RTVFSOBJOPS_VERSION,
1214	RTVFSOBJTYPE_DIR,
1215	"DvmDir",
1216	rtDvmVfsDir_Close,
1217	rtDvmVfsDir_QueryInfo,
1218	RTVFSOBJOPS_VERSION
1219	},
1220	RTVFSDIROPS_VERSION,
1221	0,
1222	{ /* ObjSet */
1223	RTVFSOBJSETOPS_VERSION,
1224	RT_UOFFSETOF(RTVFSDIROPS, ObjSet) - RT_UOFFSETOF(RTVFSDIROPS, Obj),
1225	rtDvmVfsDir_SetMode,
1226	rtDvmVfsDir_SetTimes,
1227	rtDvmVfsDir_SetOwner,
1228	RTVFSOBJSETOPS_VERSION
1229	},
1230	rtDvmVfsDir_Open,
1231	NULL /* pfnFollowAbsoluteSymlink */,
1232	rtDvmVfsDir_OpenFile,
1233	NULL /* pfnOpenDir */,
1234	rtDvmVfsDir_CreateDir,
1235	rtDvmVfsDir_OpenSymlink,
1236	rtDvmVfsDir_CreateSymlink,
1237	NULL /* pfnQueryEntryInfo */,
1238	rtDvmVfsDir_UnlinkEntry,
1239	rtDvmVfsDir_RenameEntry,
1240	rtDvmVfsDir_RewindDir,
1241	rtDvmVfsDir_ReadDir,
1242	RTVFSDIROPS_VERSION,
1243	};
1244
1245
1246
1247	/**
1248	* @interface_method_impl{RTVFSOBJOPS::Obj,pfnClose}
1249	*/
1250	static DECLCALLBACK(int) rtDvmVfsVol_Close(void *pvThis)
1251	{
1252	PRTDVMVFSVOL pThis = (PRTDVMVFSVOL)pvThis;
1253	LogFlow(("rtDvmVfsVol_Close(%p)\n", pThis));
1254
1255	if ( pThis->fCloseDvm
1256	&& pThis->hVolMgr != NIL_RTDVM )
1257	RTDvmRelease(pThis->hVolMgr);
1258	pThis->hVolMgr = NIL_RTDVM;
1259
1260	return VINF_SUCCESS;
1261	}
1262
1263
1264	/**
1265	* @interface_method_impl{RTVFSOBJOPS::Obj,pfnQueryInfo}
1266	*/
1267	static DECLCALLBACK(int) rtDvmVfsVol_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
1268	{
1269	RT_NOREF(pvThis, pObjInfo, enmAddAttr);
1270	return VERR_WRONG_TYPE;
1271	}
1272
1273
1274	/**
1275	* @interface_method_impl{RTVFSOPS,pfnOpenRoot}
1276	*/
1277	static DECLCALLBACK(int) rtDvmVfsVol_OpenRoot(void *pvThis, PRTVFSDIR phVfsDir)
1278	{
1279	PRTDVMVFSVOL pThis = (PRTDVMVFSVOL)pvThis;
1280
1281	PRTDVMVFSDIR pNewDir;
1282	int rc = RTVfsNewDir(&g_rtDvmVfsDirOps, sizeof(pNewDir), 0 /fFlags*/, pThis->hVfsSelf,
1283	NIL_RTVFSLOCK /use volume lock/, phVfsDir, (void **)&pNewDir);
1284	if (RT_SUCCESS(rc))
1285	{
1286	pNewDir->offDir = 0;
1287	pNewDir->pVfsVol = pThis;
1288	pNewDir->fReturnCurrent = false;
1289	pNewDir->pszNameAlias = NULL;
1290	pNewDir->hCurVolume = NIL_RTDVMVOLUME;
1291	}
1292	return rc;
1293	}
1294
1295
1296	/**
1297	* @interface_method_impl{RTVFSOPS,pfnQueryRangeState}
1298	*/
1299	static DECLCALLBACK(int) rtDvmVfsVol_QueryRangeState(void pvThis, uint64_t off, size_t cb, bool pfUsed)
1300	{
1301	RT_NOREF(pvThis, off, cb, pfUsed);
1302	return VERR_NOT_IMPLEMENTED;
1303	}
1304
1305
1306	DECL_HIDDEN_CONST(const RTVFSOPS) g_rtDvmVfsVolOps =
1307	{
1308	{ /* Obj */
1309	RTVFSOBJOPS_VERSION,
1310	RTVFSOBJTYPE_VFS,
1311	"DvmVol",
1312	rtDvmVfsVol_Close,
1313	rtDvmVfsVol_QueryInfo,
1314	RTVFSOBJOPS_VERSION
1315	},
1316	RTVFSOPS_VERSION,
1317	0 /* fFeatures */,
1318	rtDvmVfsVol_OpenRoot,
1319	rtDvmVfsVol_QueryRangeState,
1320	RTVFSOPS_VERSION
1321	};
1322
1323
1324
1325	/**
1326	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnValidate}
1327	*/
1328	static DECLCALLBACK(int) rtDvmVfsChain_Validate(PCRTVFSCHAINELEMENTREG pProviderReg, PRTVFSCHAINSPEC pSpec,
1329	PRTVFSCHAINELEMSPEC pElement, uint32_t *poffError, PRTERRINFO pErrInfo)
1330	{
1331	RT_NOREF(pProviderReg, pSpec);
1332
1333	/*
1334	* Basic checks.
1335	*/
1336	if (pElement->enmTypeIn != RTVFSOBJTYPE_FILE)
1337	return pElement->enmTypeIn == RTVFSOBJTYPE_INVALID ? VERR_VFS_CHAIN_CANNOT_BE_FIRST_ELEMENT : VERR_VFS_CHAIN_TAKES_FILE;
1338	if (pElement->enmType != RTVFSOBJTYPE_VFS)
1339	return VERR_VFS_CHAIN_ONLY_VFS;
1340
1341	if (pElement->cArgs > 1)
1342	return VERR_VFS_CHAIN_AT_MOST_ONE_ARG;
1343
1344	/*
1345	* Parse the flag if present, save in pElement->uProvider.
1346	*/
1347	/** @todo allow specifying sector size */
1348	bool fReadOnly = (pSpec->fOpenFile & RTFILE_O_ACCESS_MASK) == RTFILE_O_READ;
1349	if (pElement->cArgs > 0)
1350	{
1351	const char *psz = pElement->paArgs[0].psz;
1352	if (*psz)
1353	{
1354	if ( !strcmp(psz, "ro")
1355	\|\| !strcmp(psz, "r"))
1356	fReadOnly = true;
1357	else if (!strcmp(psz, "rw"))
1358	fReadOnly = false;
1359	else
1360	{
1361	*poffError = pElement->paArgs[0].offSpec;
1362	return RTErrInfoSet(pErrInfo, VERR_VFS_CHAIN_INVALID_ARGUMENT, "Expected 'ro' or 'rw' as argument");
1363	}
1364	}
1365	}
1366
1367	pElement->uProvider = fReadOnly;
1368	return VINF_SUCCESS;
1369	}
1370
1371
1372	/**
1373	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnInstantiate}
1374	*/
1375	static DECLCALLBACK(int) rtDvmVfsChain_Instantiate(PCRTVFSCHAINELEMENTREG pProviderReg, PCRTVFSCHAINSPEC pSpec,
1376	PCRTVFSCHAINELEMSPEC pElement, RTVFSOBJ hPrevVfsObj,
1377	PRTVFSOBJ phVfsObj, uint32_t *poffError, PRTERRINFO pErrInfo)
1378	{
1379	RT_NOREF(pProviderReg, pSpec, poffError, pErrInfo);
1380	AssertReturn(hPrevVfsObj != NIL_RTVFSOBJ, VERR_VFS_CHAIN_IPE);
1381
1382	/*
1383	* Instantiate the volume manager and open the map stuff.
1384	*/
1385	RTVFSFILE hPrevVfsFile = RTVfsObjToFile(hPrevVfsObj);
1386	AssertReturn(hPrevVfsFile != NIL_RTVFSFILE, VERR_VFS_CHAIN_CAST_FAILED);
1387
1388	RTDVM hVolMgr;
1389	int rc = RTDvmCreate(&hVolMgr, hPrevVfsFile, 512, 0 /fFlags/);
1390	RTVfsFileRelease(hPrevVfsFile);
1391	if (RT_SUCCESS(rc))
1392	{
1393	rc = RTDvmMapOpen(hVolMgr);
1394	if (RT_SUCCESS(rc))
1395	{
1396	/*
1397	* Create a VFS instance for the volume manager.
1398	*/
1399	RTVFS hVfs = NIL_RTVFS;
1400	PRTDVMVFSVOL pThis = NULL;
1401	rc = RTVfsNew(&g_rtDvmVfsVolOps, sizeof(RTDVMVFSVOL), NIL_RTVFS, RTVFSLOCK_CREATE_RW, &hVfs, (void **)&pThis);
1402	if (RT_SUCCESS(rc))
1403	{
1404	pThis->hVolMgr = hVolMgr;
1405	pThis->fCloseDvm = true;
1406	pThis->fReadOnly = pElement->uProvider == (uint64_t)true;
1407	pThis->cVolumes = RTDvmMapGetValidVolumes(hVolMgr);
1408	pThis->hVfsSelf = hVfs;
1409
1410	*phVfsObj = RTVfsObjFromVfs(hVfs);
1411	RTVfsRelease(hVfs);
1412	return *phVfsObj != NIL_RTVFSOBJ ? VINF_SUCCESS : VERR_VFS_CHAIN_CAST_FAILED;
1413	}
1414	}
1415	else
1416	rc = RTErrInfoSetF(pErrInfo, rc, "RTDvmMapOpen failed: %Rrc", rc);
1417	RTDvmRelease(hVolMgr);
1418	}
1419	else
1420	rc = RTErrInfoSetF(pErrInfo, rc, "RTDvmCreate failed: %Rrc", rc);
1421	return rc;
1422	}
1423
1424
1425	/**
1426	* @interface_method_impl{RTVFSCHAINELEMENTREG,pfnCanReuseElement}
1427	*/
1428	static DECLCALLBACK(bool) rtDvmVfsChain_CanReuseElement(PCRTVFSCHAINELEMENTREG pProviderReg,
1429	PCRTVFSCHAINSPEC pSpec, PCRTVFSCHAINELEMSPEC pElement,
1430	PCRTVFSCHAINSPEC pReuseSpec, PCRTVFSCHAINELEMSPEC pReuseElement)
1431	{
1432	RT_NOREF(pProviderReg, pSpec, pElement, pReuseSpec, pReuseElement);
1433	return false;
1434	}
1435
1436
1437	/** VFS chain element 'file'. */
1438	static RTVFSCHAINELEMENTREG g_rtVfsChainIsoFsVolReg =
1439	{
1440	/* uVersion = */ RTVFSCHAINELEMENTREG_VERSION,
1441	/* fReserved = */ 0,
1442	/* pszName = */ "dvm",
1443	/* ListEntry = */ { NULL, NULL },
1444	/* pszHelp = */ "Opens a container image using the VD API.\n"
1445	"Optionally takes one parameter 'ro' (read only) or 'rw' (read write).\n",
1446	/* pfnValidate = */ rtDvmVfsChain_Validate,
1447	/* pfnInstantiate = */ rtDvmVfsChain_Instantiate,
1448	/* pfnCanReuseElement = */ rtDvmVfsChain_CanReuseElement,
1449	/* uEndMarker = */ RTVFSCHAINELEMENTREG_VERSION
1450	};
1451
1452	RTVFSCHAIN_AUTO_REGISTER_ELEMENT_PROVIDER(&g_rtVfsChainIsoFsVolReg, rtVfsChainIsoFsVolReg);
1453

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source: vbox/trunk/src/VBox/Runtime/common/dvm/dvmvfs.cpp@ 80346

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