vfsbase.cpp@ 45234

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1	/* $Id: vfsbase.cpp 44529 2013-02-04 15:54:15Z vboxsync $ */
2	/** @file
3	* IPRT - Virtual File System, Base.
4	*/
5
6	/*
7	* Copyright (C) 2010-2012 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#include <iprt/vfs.h>
32	#include <iprt/vfslowlevel.h>
33
34	#include <iprt/asm.h>
35	#include <iprt/err.h>
36	#include <iprt/file.h>
37	#include <iprt/mem.h>
38	#include <iprt/param.h>
39	#include <iprt/path.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/thread.h>
42
43	#include "internal/file.h"
44	#include "internal/fs.h"
45	#include "internal/magics.h"
46	//#include "internal/vfs.h"
47
48
49	/*******************************************************************************
50	* Defined Constants And Macros *
51	*******************************************************************************/
52	/** The instance data alignment. */
53	#define RTVFS_INST_ALIGNMENT 16U
54
55	/** The max number of symbolic links to resolve in a path. */
56	#define RTVFS_MAX_LINKS 20U
57
58
59	/** Asserts that the VFS base object vtable is valid. */
60	#define RTVFSOBJ_ASSERT_OPS(a_pObjOps, a_enmType) \
61	do \
62	{ \
63	Assert((a_pObjOps)->uVersion == RTVFSOBJOPS_VERSION); \
64	Assert((a_pObjOps)->enmType == (a_enmType) \|\| (a_enmType) == RTVFSOBJTYPE_INVALID); \
65	AssertPtr((a_pObjOps)->pszName); \
66	Assert(*(a_pObjOps)->pszName); \
67	AssertPtr((a_pObjOps)->pfnClose); \
68	AssertPtr((a_pObjOps)->pfnQueryInfo); \
69	Assert((a_pObjOps)->uEndMarker == RTVFSOBJOPS_VERSION); \
70	} while (0)
71
72	/** Asserts that the VFS set object vtable is valid. */
73	#define RTVFSOBJSET_ASSERT_OPS(a_pSetOps, a_offObjOps) \
74	do \
75	{ \
76	Assert((a_pSetOps)->uVersion == RTVFSOBJSETOPS_VERSION); \
77	Assert((a_pSetOps)->offObjOps == (a_offObjOps)); \
78	AssertPtr((a_pSetOps)->pfnSetMode); \
79	AssertPtr((a_pSetOps)->pfnSetTimes); \
80	AssertPtr((a_pSetOps)->pfnSetOwner); \
81	Assert((a_pSetOps)->uEndMarker == RTVFSOBJSETOPS_VERSION); \
82	} while (0)
83
84	/** Asserts that the VFS I/O stream vtable is valid. */
85	#define RTVFSIOSTREAM_ASSERT_OPS(pIoStreamOps, a_enmType) \
86	do { \
87	RTVFSOBJ_ASSERT_OPS(&(pIoStreamOps)->Obj, a_enmType); \
88	Assert((pIoStreamOps)->uVersion == RTVFSIOSTREAMOPS_VERSION); \
89	Assert(!((pIoStreamOps)->fFeatures & ~RTVFSIOSTREAMOPS_FEAT_VALID_MASK)); \
90	AssertPtr((pIoStreamOps)->pfnRead); \
91	AssertPtr((pIoStreamOps)->pfnWrite); \
92	AssertPtr((pIoStreamOps)->pfnFlush); \
93	AssertPtr((pIoStreamOps)->pfnPollOne); \
94	AssertPtr((pIoStreamOps)->pfnTell); \
95	AssertPtrNull((pIoStreamOps)->pfnSkip); \
96	AssertPtrNull((pIoStreamOps)->pfnZeroFill); \
97	Assert((pIoStreamOps)->uEndMarker == RTVFSIOSTREAMOPS_VERSION); \
98	} while (0)
99
100	/** Asserts that the VFS symlink vtable is valid. */
101	#define RTVFSSYMLINK_ASSERT_OPS(pSymlinkOps, a_enmType) \
102	do { \
103	RTVFSOBJ_ASSERT_OPS(&(pSymlinkOps)->Obj, a_enmType); \
104	RTVFSOBJSET_ASSERT_OPS(&(pSymlinkOps)->ObjSet, \
105	RT_OFFSETOF(RTVFSSYMLINKOPS, Obj) - RT_OFFSETOF(RTVFSSYMLINKOPS, ObjSet)); \
106	Assert((pSymlinkOps)->uVersion == RTVFSSYMLINKOPS_VERSION); \
107	Assert(!(pSymlinkOps)->fReserved); \
108	AssertPtr((pSymlinkOps)->pfnRead); \
109	Assert((pSymlinkOps)->uEndMarker == RTVFSSYMLINKOPS_VERSION); \
110	} while (0)
111
112
113	/** Validates a VFS handle and returns @a rcRet if it's invalid. */
114	#define RTVFS_ASSERT_VALID_HANDLE_OR_NIL_RETURN(hVfs, rcRet) \
115	do { \
116	if ((hVfs) != NIL_RTVFS) \
117	{ \
118	AssertPtrReturn((hVfs), (rcRet)); \
119	AssertReturn((hVfs)->uMagic == RTVFS_MAGIC, (rcRet)); \
120	} \
121	} while (0)
122
123
124	/*******************************************************************************
125	* Structures and Typedefs *
126	*******************************************************************************/
127	/** @todo Move all this stuff to internal/vfs.h */
128
129
130	/**
131	* The VFS internal lock data.
132	*/
133	typedef struct RTVFSLOCKINTERNAL
134	{
135	/** The number of references to the this lock. */
136	uint32_t volatile cRefs;
137	/** The lock type. */
138	RTVFSLOCKTYPE enmType;
139	/** Type specific data. */
140	union
141	{
142	/** Read/Write semaphore handle. */
143	RTSEMRW hSemRW;
144	/** Fast mutex semaphore handle. */
145	RTSEMFASTMUTEX hFastMtx;
146	/** Regular mutex semaphore handle. */
147	RTSEMMUTEX hMtx;
148	} u;
149	} RTVFSLOCKINTERNAL;
150
151
152	/**
153	* The VFS base object handle data.
154	*
155	* All other VFS handles are derived from this one. The final handle type is
156	* indicated by RTVFSOBJOPS::enmType via the RTVFSOBJINTERNAL::pOps member.
157	*/
158	typedef struct RTVFSOBJINTERNAL
159	{
160	/** The VFS magic (RTVFSOBJ_MAGIC). */
161	uint32_t uMagic;
162	/** The number of references to this VFS object. */
163	uint32_t volatile cRefs;
164	/** Pointer to the instance data. */
165	void *pvThis;
166	/** The vtable. */
167	PCRTVFSOBJOPS pOps;
168	/** The lock protecting all access to the VFS.
169	* Only valid RTVFS_C_THREAD_SAFE is set, otherwise it is NIL_RTVFSLOCK. */
170	RTVFSLOCK hLock;
171	/** Reference back to the VFS containing this object. */
172	RTVFS hVfs;
173	} RTVFSOBJINTERNAL;
174
175
176	/**
177	* The VFS filesystem stream handle data.
178	*
179	* @extends RTVFSOBJINTERNAL
180	*/
181	typedef struct RTVFSFSSTREAMINTERNAL
182	{
183	/** The VFS magic (RTVFSFSTREAM_MAGIC). */
184	uint32_t uMagic;
185	/** File open flags, at a minimum the access mask. */
186	uint32_t fFlags;
187	/** The vtable. */
188	PCRTVFSFSSTREAMOPS pOps;
189	/** The base object handle data. */
190	RTVFSOBJINTERNAL Base;
191	} RTVFSFSSTREAMINTERNAL;
192
193
194	/**
195	* The VFS handle data.
196	*
197	* @extends RTVFSOBJINTERNAL
198	*/
199	typedef struct RTVFSINTERNAL
200	{
201	/** The VFS magic (RTVFS_MAGIC). */
202	uint32_t uMagic;
203	/** Creation flags (RTVFS_C_XXX). */
204	uint32_t fFlags;
205	/** The vtable. */
206	PCRTVFSOPS pOps;
207	/** The base object handle data. */
208	RTVFSOBJINTERNAL Base;
209	} RTVFSINTERNAL;
210
211
212	/**
213	* The VFS directory handle data.
214	*
215	* @extends RTVFSOBJINTERNAL
216	*/
217	typedef struct RTVFSDIRINTERNAL
218	{
219	/** The VFS magic (RTVFSDIR_MAGIC). */
220	uint32_t uMagic;
221	/** Reserved for flags or something. */
222	uint32_t fReserved;
223	/** The vtable. */
224	PCRTVFSDIROPS pOps;
225	/** The base object handle data. */
226	RTVFSOBJINTERNAL Base;
227	} RTVFSDIRINTERNAL;
228
229
230	/**
231	* The VFS symbolic link handle data.
232	*
233	* @extends RTVFSOBJINTERNAL
234	*/
235	typedef struct RTVFSSYMLINKINTERNAL
236	{
237	/** The VFS magic (RTVFSSYMLINK_MAGIC). */
238	uint32_t uMagic;
239	/** Reserved for flags or something. */
240	uint32_t fReserved;
241	/** The vtable. */
242	PCRTVFSSYMLINKOPS pOps;
243	/** The base object handle data. */
244	RTVFSOBJINTERNAL Base;
245	} RTVFSSYMLINKINTERNAL;
246
247
248	/**
249	* The VFS I/O stream handle data.
250	*
251	* This is often part of a type specific handle, like a file or pipe.
252	*
253	* @extends RTVFSOBJINTERNAL
254	*/
255	typedef struct RTVFSIOSTREAMINTERNAL
256	{
257	/** The VFS magic (RTVFSIOSTREAM_MAGIC). */
258	uint32_t uMagic;
259	/** File open flags, at a minimum the access mask. */
260	uint32_t fFlags;
261	/** The vtable. */
262	PCRTVFSIOSTREAMOPS pOps;
263	/** The base object handle data. */
264	RTVFSOBJINTERNAL Base;
265	} RTVFSIOSTREAMINTERNAL;
266
267
268	/**
269	* The VFS file handle data.
270	*
271	* @extends RTVFSIOSTREAMINTERNAL
272	*/
273	typedef struct RTVFSFILEINTERNAL
274	{
275	/** The VFS magic (RTVFSFILE_MAGIC). */
276	uint32_t uMagic;
277	/** Reserved for flags or something. */
278	uint32_t fReserved;
279	/** The vtable. */
280	PCRTVFSFILEOPS pOps;
281	/** The stream handle data. */
282	RTVFSIOSTREAMINTERNAL Stream;
283	} RTVFSFILEINTERNAL;
284
285	#if 0 /* later */
286
287	/**
288	* The VFS pipe handle data.
289	*
290	* @extends RTVFSIOSTREAMINTERNAL
291	*/
292	typedef struct RTVFSPIPEINTERNAL
293	{
294	/** The VFS magic (RTVFSPIPE_MAGIC). */
295	uint32_t uMagic;
296	/** Reserved for flags or something. */
297	uint32_t fReserved;
298	/** The vtable. */
299	PCRTVFSPIPEOPS pOps;
300	/** The stream handle data. */
301	RTVFSIOSTREAMINTERNAL Stream;
302	} RTVFSPIPEINTERNAL;
303
304
305	/**
306	* The VFS socket handle data.
307	*
308	* @extends RTVFSIOSTREAMINTERNAL
309	*/
310	typedef struct RTVFSSOCKETINTERNAL
311	{
312	/** The VFS magic (RTVFSSOCKET_MAGIC). */
313	uint32_t uMagic;
314	/** Reserved for flags or something. */
315	uint32_t fReserved;
316	/** The vtable. */
317	PCRTVFSSOCKETOPS pOps;
318	/** The stream handle data. */
319	RTVFSIOSTREAMINTERNAL Stream;
320	} RTVFSSOCKETINTERNAL;
321
322	#endif /* later */
323
324
325
326	/*
327	*
328	* V F S L o c k A b s t r a c t i o n
329	* V F S L o c k A b s t r a c t i o n
330	* V F S L o c k A b s t r a c t i o n
331	*
332	*
333	*/
334
335
336	RTDECL(uint32_t) RTVfsLockRetain(RTVFSLOCK hLock)
337	{
338	RTVFSLOCKINTERNAL *pThis = hLock;
339	AssertPtrReturn(pThis, UINT32_MAX);
340	AssertReturn(pThis->enmType > RTVFSLOCKTYPE_INVALID && pThis->enmType < RTVFSLOCKTYPE_END, UINT32_MAX);
341
342	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
343	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p %d\n", cRefs, pThis, pThis->enmType));
344	return cRefs;
345	}
346
347
348	/**
349	* Destroys a VFS lock handle.
350	*
351	* @param pThis The lock to destroy.
352	*/
353	static void rtVfsLockDestroy(RTVFSLOCKINTERNAL *pThis)
354	{
355	switch (pThis->enmType)
356	{
357	case RTVFSLOCKTYPE_RW:
358	RTSemRWDestroy(pThis->u.hSemRW);
359	pThis->u.hSemRW = NIL_RTSEMRW;
360	break;
361
362	case RTVFSLOCKTYPE_FASTMUTEX:
363	RTSemFastMutexDestroy(pThis->u.hFastMtx);
364	pThis->u.hFastMtx = NIL_RTSEMFASTMUTEX;
365	break;
366
367	case RTVFSLOCKTYPE_MUTEX:
368	RTSemMutexDestroy(pThis->u.hMtx);
369	pThis->u.hFastMtx = NIL_RTSEMMUTEX;
370	break;
371
372	default:
373	AssertMsgFailedReturnVoid(("%p %d\n", pThis, pThis->enmType));
374	}
375
376	pThis->enmType = RTVFSLOCKTYPE_INVALID;
377	RTMemFree(pThis);
378	}
379
380
381	RTDECL(uint32_t) RTVfsLockRelease(RTVFSLOCK hLock)
382	{
383	RTVFSLOCKINTERNAL *pThis = hLock;
384	if (pThis == NIL_RTVFSLOCK)
385	return 0;
386	AssertPtrReturn(pThis, UINT32_MAX);
387	AssertReturn(pThis->enmType > RTVFSLOCKTYPE_INVALID && pThis->enmType < RTVFSLOCKTYPE_END, UINT32_MAX);
388
389	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
390	AssertMsg(cRefs < _1M, ("%#x %p %d\n", cRefs, pThis, pThis->enmType));
391	if (cRefs == 0)
392	rtVfsLockDestroy(pThis);
393	return cRefs;
394	}
395
396
397	/**
398	* Creates a read/write lock.
399	*
400	* @returns IPRT status code
401	* @param phLock Where to return the lock handle.
402	*/
403	static int rtVfsLockCreateRW(PRTVFSLOCK phLock)
404	{
405	RTVFSLOCKINTERNAL pThis = (RTVFSLOCKINTERNAL )RTMemAlloc(sizeof(*pThis));
406	if (!pThis)
407	return VERR_NO_MEMORY;
408
409	pThis->cRefs = 1;
410	pThis->enmType = RTVFSLOCKTYPE_RW;
411
412	int rc = RTSemRWCreate(&pThis->u.hSemRW);
413	if (RT_FAILURE(rc))
414	{
415	RTMemFree(pThis);
416	return rc;
417	}
418
419	*phLock = pThis;
420	return VINF_SUCCESS;
421	}
422
423
424	/**
425	* Creates a fast mutex lock.
426	*
427	* @returns IPRT status code
428	* @param phLock Where to return the lock handle.
429	*/
430	static int rtVfsLockCreateFastMutex(PRTVFSLOCK phLock)
431	{
432	RTVFSLOCKINTERNAL pThis = (RTVFSLOCKINTERNAL )RTMemAlloc(sizeof(*pThis));
433	if (!pThis)
434	return VERR_NO_MEMORY;
435
436	pThis->cRefs = 1;
437	pThis->enmType = RTVFSLOCKTYPE_FASTMUTEX;
438
439	int rc = RTSemFastMutexCreate(&pThis->u.hFastMtx);
440	if (RT_FAILURE(rc))
441	{
442	RTMemFree(pThis);
443	return rc;
444	}
445
446	*phLock = pThis;
447	return VINF_SUCCESS;
448
449	}
450
451
452	/**
453	* Creates a mutex lock.
454	*
455	* @returns IPRT status code
456	* @param phLock Where to return the lock handle.
457	*/
458	static int rtVfsLockCreateMutex(PRTVFSLOCK phLock)
459	{
460	RTVFSLOCKINTERNAL pThis = (RTVFSLOCKINTERNAL )RTMemAlloc(sizeof(*pThis));
461	if (!pThis)
462	return VERR_NO_MEMORY;
463
464	pThis->cRefs = 1;
465	pThis->enmType = RTVFSLOCKTYPE_MUTEX;
466
467	int rc = RTSemMutexCreate(&pThis->u.hMtx);
468	if (RT_FAILURE(rc))
469	{
470	RTMemFree(pThis);
471	return rc;
472	}
473
474	*phLock = pThis;
475	return VINF_SUCCESS;
476	}
477
478
479	/**
480	* Acquires the lock for reading.
481	*
482	* @param hLock Non-nil lock handle.
483	* @internal
484	*/
485	RTDECL(void) RTVfsLockAcquireReadSlow(RTVFSLOCK hLock)
486	{
487	RTVFSLOCKINTERNAL *pThis = hLock;
488	int rc;
489
490	AssertPtr(pThis);
491	switch (pThis->enmType)
492	{
493	case RTVFSLOCKTYPE_RW:
494	rc = RTSemRWRequestRead(pThis->u.hSemRW, RT_INDEFINITE_WAIT);
495	AssertRC(rc);
496	break;
497
498	case RTVFSLOCKTYPE_FASTMUTEX:
499	rc = RTSemFastMutexRequest(pThis->u.hFastMtx);
500	AssertRC(rc);
501	break;
502
503	case RTVFSLOCKTYPE_MUTEX:
504	rc = RTSemMutexRequest(pThis->u.hMtx, RT_INDEFINITE_WAIT);
505	AssertRC(rc);
506	break;
507	default:
508	AssertFailed();
509	}
510	}
511
512
513	/**
514	* Release a lock held for reading.
515	*
516	* @param hLock Non-nil lock handle.
517	* @internal
518	*/
519	RTDECL(void) RTVfsLockReleaseReadSlow(RTVFSLOCK hLock)
520	{
521	RTVFSLOCKINTERNAL *pThis = hLock;
522	int rc;
523
524	AssertPtr(pThis);
525	switch (pThis->enmType)
526	{
527	case RTVFSLOCKTYPE_RW:
528	rc = RTSemRWReleaseRead(pThis->u.hSemRW);
529	AssertRC(rc);
530	break;
531
532	case RTVFSLOCKTYPE_FASTMUTEX:
533	rc = RTSemFastMutexRelease(pThis->u.hFastMtx);
534	AssertRC(rc);
535	break;
536
537	case RTVFSLOCKTYPE_MUTEX:
538	rc = RTSemMutexRelease(pThis->u.hMtx);
539	AssertRC(rc);
540	break;
541	default:
542	AssertFailed();
543	}
544	}
545
546
547	/**
548	* Acquires the lock for writing.
549	*
550	* @param hLock Non-nil lock handle.
551	* @internal
552	*/
553	RTDECL(void) RTVfsLockAcquireWriteSlow(RTVFSLOCK hLock)
554	{
555	RTVFSLOCKINTERNAL *pThis = hLock;
556	int rc;
557
558	AssertPtr(pThis);
559	switch (pThis->enmType)
560	{
561	case RTVFSLOCKTYPE_RW:
562	rc = RTSemRWRequestWrite(pThis->u.hSemRW, RT_INDEFINITE_WAIT);
563	AssertRC(rc);
564	break;
565
566	case RTVFSLOCKTYPE_FASTMUTEX:
567	rc = RTSemFastMutexRequest(pThis->u.hFastMtx);
568	AssertRC(rc);
569	break;
570
571	case RTVFSLOCKTYPE_MUTEX:
572	rc = RTSemMutexRequest(pThis->u.hMtx, RT_INDEFINITE_WAIT);
573	AssertRC(rc);
574	break;
575	default:
576	AssertFailed();
577	}
578	}
579
580
581	/**
582	* Release a lock held for writing.
583	*
584	* @param hLock Non-nil lock handle.
585	* @internal
586	*/
587	RTDECL(void) RTVfsLockReleaseWriteSlow(RTVFSLOCK hLock)
588	{
589	RTVFSLOCKINTERNAL *pThis = hLock;
590	int rc;
591
592	AssertPtr(pThis);
593	switch (pThis->enmType)
594	{
595	case RTVFSLOCKTYPE_RW:
596	rc = RTSemRWReleaseWrite(pThis->u.hSemRW);
597	AssertRC(rc);
598	break;
599
600	case RTVFSLOCKTYPE_FASTMUTEX:
601	rc = RTSemFastMutexRelease(pThis->u.hFastMtx);
602	AssertRC(rc);
603	break;
604
605	case RTVFSLOCKTYPE_MUTEX:
606	rc = RTSemMutexRelease(pThis->u.hMtx);
607	AssertRC(rc);
608	break;
609	default:
610	AssertFailed();
611	}
612	}
613
614
615
616	/*
617	*
618	* B A S E O B J E C T
619	* B A S E O B J E C T
620	* B A S E O B J E C T
621	*
622	*/
623
624	/**
625	* Internal object retainer that asserts sanity in strict builds.
626	*
627	* @param pThis The base object handle data.
628	*/
629	DECLINLINE(void) rtVfsObjRetainVoid(RTVFSOBJINTERNAL *pThis)
630	{
631	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
632	AssertMsg(cRefs > 1 && cRefs < _1M,
633	("%#x %p ops=%p %s (%d)\n", cRefs, pThis, pThis->pOps, pThis->pOps->pszName, pThis->pOps->enmType));
634	NOREF(cRefs);
635	}
636
637
638	/**
639	* Initializes the base object part of a new object.
640	*
641	* @returns IPRT status code.
642	* @param pThis Pointer to the base object part.
643	* @param pObjOps The base object vtable.
644	* @param hVfs The VFS handle to associate with.
645	* @param hLock The lock handle, pseudo handle or nil.
646	* @param pvThis Pointer to the private data.
647	*/
648	static int rtVfsObjInitNewObject(RTVFSOBJINTERNAL pThis, PCRTVFSOBJOPS pObjOps, RTVFS hVfs, RTVFSLOCK hLock, void pvThis)
649	{
650	/*
651	* Deal with the lock first as that's the most complicated matter.
652	*/
653	if (hLock != NIL_RTVFSLOCK)
654	{
655	int rc;
656	if (hLock == RTVFSLOCK_CREATE_RW)
657	{
658	rc = rtVfsLockCreateRW(&hLock);
659	AssertRCReturn(rc, rc);
660	}
661	else if (hLock == RTVFSLOCK_CREATE_FASTMUTEX)
662	{
663	rc = rtVfsLockCreateFastMutex(&hLock);
664	AssertRCReturn(rc, rc);
665	}
666	else if (hLock == RTVFSLOCK_CREATE_MUTEX)
667	{
668	rc = rtVfsLockCreateMutex(&hLock);
669	AssertRCReturn(rc, rc);
670	}
671	else
672	{
673	/*
674	* The caller specified a lock, we consume the this reference.
675	*/
676	AssertPtrReturn(hLock, VERR_INVALID_HANDLE);
677	AssertReturn(hLock->enmType > RTVFSLOCKTYPE_INVALID && hLock->enmType < RTVFSLOCKTYPE_END, VERR_INVALID_HANDLE);
678	AssertReturn(hLock->cRefs > 0, VERR_INVALID_HANDLE);
679	}
680	}
681	else if (hVfs != NIL_RTVFS)
682	{
683	/*
684	* Retain a reference to the VFS lock, if there is one.
685	*/
686	hLock = hVfs->Base.hLock;
687	if (hLock != NIL_RTVFSLOCK)
688	{
689	uint32_t cRefs = RTVfsLockRetain(hLock);
690	if (RT_UNLIKELY(cRefs == UINT32_MAX))
691	return VERR_INVALID_HANDLE;
692	}
693	}
694
695
696	/*
697	* Do the actual initializing.
698	*/
699	pThis->uMagic = RTVFSOBJ_MAGIC;
700	pThis->pvThis = pvThis;
701	pThis->pOps = pObjOps;
702	pThis->cRefs = 1;
703	pThis->hVfs = hVfs;
704	pThis->hLock = hLock;
705	if (hVfs != NIL_RTVFS)
706	rtVfsObjRetainVoid(&hVfs->Base);
707
708	return VINF_SUCCESS;
709	}
710
711
712	RTDECL(int) RTVfsNewBaseObj(PCRTVFSOBJOPS pObjOps, size_t cbInstance, RTVFS hVfs, RTVFSLOCK hLock,
713	PRTVFSOBJ phVfsObj, void **ppvInstance)
714	{
715	/*
716	* Validate the input, be extra strict in strict builds.
717	*/
718	AssertPtr(pObjOps);
719	AssertReturn(pObjOps->uVersion == RTVFSOBJOPS_VERSION, VERR_VERSION_MISMATCH);
720	AssertReturn(pObjOps->uEndMarker == RTVFSOBJOPS_VERSION, VERR_VERSION_MISMATCH);
721	RTVFSOBJ_ASSERT_OPS(pObjOps, RTVFSOBJTYPE_BASE);
722	Assert(cbInstance > 0);
723	AssertPtr(ppvInstance);
724	AssertPtr(phVfsObj);
725	RTVFS_ASSERT_VALID_HANDLE_OR_NIL_RETURN(hVfs, VERR_INVALID_HANDLE);
726
727	/*
728	* Allocate the handle + instance data.
729	*/
730	size_t const cbThis = RT_ALIGN_Z(sizeof(RTVFSOBJINTERNAL), RTVFS_INST_ALIGNMENT)
731	+ RT_ALIGN_Z(cbInstance, RTVFS_INST_ALIGNMENT);
732	RTVFSOBJINTERNAL pThis = (RTVFSOBJINTERNAL )RTMemAllocZ(cbThis);
733	if (!pThis)
734	return VERR_NO_MEMORY;
735
736	int rc = rtVfsObjInitNewObject(pThis, pObjOps, hVfs, hLock,
737	(char )pThis + RT_ALIGN_Z(sizeof(pThis), RTVFS_INST_ALIGNMENT));
738	if (RT_FAILURE(rc))
739	{
740	RTMemFree(pThis);
741	return rc;
742	}
743
744	*phVfsObj = pThis;
745	*ppvInstance = pThis->pvThis;
746	return VINF_SUCCESS;
747	}
748
749
750	/**
751	* Internal object retainer that asserts sanity in strict builds.
752	*
753	* @returns The new reference count.
754	* @param pThis The base object handle data.
755	*/
756	DECLINLINE(uint32_t) rtVfsObjRetain(RTVFSOBJINTERNAL *pThis)
757	{
758	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
759	AssertMsg(cRefs > 1 && cRefs < _1M,
760	("%#x %p ops=%p %s (%d)\n", cRefs, pThis, pThis->pOps, pThis->pOps->pszName, pThis->pOps->enmType));
761	return cRefs;
762	}
763
764
765	RTDECL(uint32_t) RTVfsObjRetain(RTVFSOBJ hVfsObj)
766	{
767	RTVFSOBJINTERNAL *pThis = hVfsObj;
768	AssertPtrReturn(pThis, UINT32_MAX);
769	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, UINT32_MAX);
770
771	return rtVfsObjRetain(pThis);
772	}
773
774
775	/**
776	* Does the actual object destruction for rtVfsObjRelease().
777	*
778	* @param pThis The object to destroy.
779	*/
780	static void rtVfsObjDestroy(RTVFSOBJINTERNAL *pThis)
781	{
782	RTVFSOBJTYPE const enmType = pThis->pOps->enmType;
783
784	/*
785	* Invalidate the object.
786	*/
787	RTVfsLockAcquireWrite(pThis->hLock); /* paranoia */
788	void *pvToFree = NULL;
789	switch (enmType)
790	{
791	case RTVFSOBJTYPE_BASE:
792	pvToFree = pThis;
793	break;
794
795	case RTVFSOBJTYPE_VFS:
796	pvToFree = RT_FROM_MEMBER(pThis, RTVFSINTERNAL, Base);
797	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSINTERNAL, Base)->uMagic, RTVFS_MAGIC_DEAD);
798	break;
799
800	case RTVFSOBJTYPE_FS_STREAM:
801	pvToFree = RT_FROM_MEMBER(pThis, RTVFSFSSTREAMINTERNAL, Base);
802	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSFSSTREAMINTERNAL, Base)->uMagic, RTVFSFSSTREAM_MAGIC_DEAD);
803	break;
804
805	case RTVFSOBJTYPE_IO_STREAM:
806	pvToFree = RT_FROM_MEMBER(pThis, RTVFSIOSTREAMINTERNAL, Base);
807	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSIOSTREAMINTERNAL, Base)->uMagic, RTVFSIOSTREAM_MAGIC_DEAD);
808	break;
809
810	case RTVFSOBJTYPE_DIR:
811	pvToFree = RT_FROM_MEMBER(pThis, RTVFSDIRINTERNAL, Base);
812	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSDIRINTERNAL, Base)->uMagic, RTVFSDIR_MAGIC_DEAD);
813	break;
814
815	case RTVFSOBJTYPE_FILE:
816	pvToFree = RT_FROM_MEMBER(pThis, RTVFSFILEINTERNAL, Stream.Base);
817	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSFILEINTERNAL, Stream.Base)->uMagic, RTVFSFILE_MAGIC_DEAD);
818	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSIOSTREAMINTERNAL, Base)->uMagic, RTVFSIOSTREAM_MAGIC_DEAD);
819	break;
820
821	case RTVFSOBJTYPE_SYMLINK:
822	pvToFree = RT_FROM_MEMBER(pThis, RTVFSSYMLINKINTERNAL, Base);
823	ASMAtomicWriteU32(&RT_FROM_MEMBER(pThis, RTVFSSYMLINKINTERNAL, Base)->uMagic, RTVFSSYMLINK_MAGIC_DEAD);
824	break;
825
826	case RTVFSOBJTYPE_INVALID:
827	case RTVFSOBJTYPE_END:
828	case RTVFSOBJTYPE_32BIT_HACK:
829	AssertMsgFailed(("enmType=%d ops=%p %s\n", enmType, pThis->pOps, pThis->pOps->pszName));
830	break;
831	/* no default as we want gcc warnings. */
832	}
833	ASMAtomicWriteU32(&pThis->uMagic, RTVFSOBJ_MAGIC_DEAD);
834	RTVfsLockReleaseWrite(pThis->hLock);
835
836	/*
837	* Close the object and free the handle.
838	*/
839	int rc = pThis->pOps->pfnClose(pThis->pvThis);
840	AssertRC(rc);
841	RTMemFree(pvToFree);
842	}
843
844
845	/**
846	* Internal object releaser that asserts sanity in strict builds.
847	*
848	* @returns The new reference count.
849	* @param pcRefs The reference counter.
850	*/
851	DECLINLINE(uint32_t) rtVfsObjRelease(RTVFSOBJINTERNAL *pThis)
852	{
853	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
854	AssertMsg(cRefs < _1M, ("%#x %p ops=%p %s (%d)\n", cRefs, pThis, pThis->pOps, pThis->pOps->pszName, pThis->pOps->enmType));
855	if (cRefs == 0)
856	rtVfsObjDestroy(pThis);
857	return cRefs;
858	}
859
860
861	RTDECL(uint32_t) RTVfsObjRelease(RTVFSOBJ hVfsObj)
862	{
863	RTVFSOBJINTERNAL *pThis = hVfsObj;
864	if (pThis == NIL_RTVFSOBJ)
865	return 0;
866	AssertPtrReturn(pThis, UINT32_MAX);
867	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, UINT32_MAX);
868	return rtVfsObjRelease(pThis);
869	}
870
871
872	RTDECL(RTVFS) RTVfsObjToVfs(RTVFSOBJ hVfsObj)
873	{
874	RTVFSOBJINTERNAL *pThis = hVfsObj;
875	if (pThis != NIL_RTVFSOBJ)
876	{
877	AssertPtrReturn(pThis, NIL_RTVFS);
878	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFS);
879
880	if (pThis->pOps->enmType == RTVFSOBJTYPE_VFS)
881	{
882	rtVfsObjRetainVoid(pThis);
883	return RT_FROM_MEMBER(pThis, RTVFSINTERNAL, Base);
884	}
885	}
886	return NIL_RTVFS;
887	}
888
889
890	RTDECL(RTVFSFSSTREAM) RTVfsObjToFsStream(RTVFSOBJ hVfsObj)
891	{
892	RTVFSOBJINTERNAL *pThis = hVfsObj;
893	if (pThis != NIL_RTVFSOBJ)
894	{
895	AssertPtrReturn(pThis, NIL_RTVFSFSSTREAM);
896	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSFSSTREAM);
897
898	if (pThis->pOps->enmType == RTVFSOBJTYPE_FS_STREAM)
899	{
900	rtVfsObjRetainVoid(pThis);
901	return RT_FROM_MEMBER(pThis, RTVFSFSSTREAMINTERNAL, Base);
902	}
903	}
904	return NIL_RTVFSFSSTREAM;
905	}
906
907
908	RTDECL(RTVFSDIR) RTVfsObjToDir(RTVFSOBJ hVfsObj)
909	{
910	RTVFSOBJINTERNAL *pThis = hVfsObj;
911	if (pThis != NIL_RTVFSOBJ)
912	{
913	AssertPtrReturn(pThis, NIL_RTVFSDIR);
914	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSDIR);
915
916	if (pThis->pOps->enmType == RTVFSOBJTYPE_DIR)
917	{
918	rtVfsObjRetainVoid(pThis);
919	return RT_FROM_MEMBER(pThis, RTVFSDIRINTERNAL, Base);
920	}
921	}
922	return NIL_RTVFSDIR;
923	}
924
925
926	RTDECL(RTVFSIOSTREAM) RTVfsObjToIoStream(RTVFSOBJ hVfsObj)
927	{
928	RTVFSOBJINTERNAL *pThis = hVfsObj;
929	if (pThis != NIL_RTVFSOBJ)
930	{
931	AssertPtrReturn(pThis, NIL_RTVFSIOSTREAM);
932	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSIOSTREAM);
933
934	if ( pThis->pOps->enmType == RTVFSOBJTYPE_IO_STREAM
935	\|\| pThis->pOps->enmType == RTVFSOBJTYPE_FILE)
936	{
937	rtVfsObjRetainVoid(pThis);
938	return RT_FROM_MEMBER(pThis, RTVFSIOSTREAMINTERNAL, Base);
939	}
940	}
941	return NIL_RTVFSIOSTREAM;
942	}
943
944
945	RTDECL(RTVFSFILE) RTVfsObjToFile(RTVFSOBJ hVfsObj)
946	{
947	RTVFSOBJINTERNAL *pThis = hVfsObj;
948	if (pThis != NIL_RTVFSOBJ)
949	{
950	AssertPtrReturn(pThis, NIL_RTVFSFILE);
951	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSFILE);
952
953	if (pThis->pOps->enmType == RTVFSOBJTYPE_FILE)
954	{
955	rtVfsObjRetainVoid(pThis);
956	return RT_FROM_MEMBER(pThis, RTVFSFILEINTERNAL, Stream.Base);
957	}
958	}
959	return NIL_RTVFSFILE;
960	}
961
962
963	RTDECL(RTVFSSYMLINK) RTVfsObjToSymlink(RTVFSOBJ hVfsObj)
964	{
965	RTVFSOBJINTERNAL *pThis = hVfsObj;
966	if (pThis != NIL_RTVFSOBJ)
967	{
968	AssertPtrReturn(pThis, NIL_RTVFSSYMLINK);
969	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSSYMLINK);
970
971	if (pThis->pOps->enmType == RTVFSOBJTYPE_SYMLINK)
972	{
973	rtVfsObjRetainVoid(pThis);
974	return RT_FROM_MEMBER(pThis, RTVFSSYMLINKINTERNAL, Base);
975	}
976	}
977	return NIL_RTVFSSYMLINK;
978	}
979
980
981	RTDECL(RTVFSOBJ) RTVfsObjFromVfs(RTVFS hVfs)
982	{
983	if (hVfs != NIL_RTVFS)
984	{
985	RTVFSOBJINTERNAL *pThis = &hVfs->Base;
986	AssertPtrReturn(pThis, NIL_RTVFSOBJ);
987	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSOBJ);
988
989	rtVfsObjRetainVoid(pThis);
990	return pThis;
991	}
992	return NIL_RTVFSOBJ;
993	}
994
995
996	RTDECL(RTVFSOBJ) RTVfsObjFromFsStream(RTVFSFSSTREAM hVfsFss)
997	{
998	if (hVfsFss != NIL_RTVFSFSSTREAM)
999	{
1000	RTVFSOBJINTERNAL *pThis = &hVfsFss->Base;
1001	AssertPtrReturn(pThis, NIL_RTVFSOBJ);
1002	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSOBJ);
1003
1004	rtVfsObjRetainVoid(pThis);
1005	return pThis;
1006	}
1007	return NIL_RTVFSOBJ;
1008	}
1009
1010
1011	RTDECL(RTVFSOBJ) RTVfsObjFromDir(RTVFSDIR hVfsDir)
1012	{
1013	if (hVfsDir != NIL_RTVFSDIR)
1014	{
1015	RTVFSOBJINTERNAL *pThis = &hVfsDir->Base;
1016	AssertPtrReturn(pThis, NIL_RTVFSOBJ);
1017	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSOBJ);
1018
1019	rtVfsObjRetainVoid(pThis);
1020	return pThis;
1021	}
1022	return NIL_RTVFSOBJ;
1023	}
1024
1025
1026	RTDECL(RTVFSOBJ) RTVfsObjFromIoStream(RTVFSIOSTREAM hVfsIos)
1027	{
1028	if (hVfsIos != NIL_RTVFSIOSTREAM)
1029	{
1030	RTVFSOBJINTERNAL *pThis = &hVfsIos->Base;
1031	AssertPtrReturn(pThis, NIL_RTVFSOBJ);
1032	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSOBJ);
1033
1034	rtVfsObjRetainVoid(pThis);
1035	return pThis;
1036	}
1037	return NIL_RTVFSOBJ;
1038	}
1039
1040
1041	RTDECL(RTVFSOBJ) RTVfsObjFromFile(RTVFSFILE hVfsFile)
1042	{
1043	if (hVfsFile != NIL_RTVFSFILE)
1044	{
1045	RTVFSOBJINTERNAL *pThis = &hVfsFile->Stream.Base;
1046	AssertPtrReturn(pThis, NIL_RTVFSOBJ);
1047	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSOBJ);
1048
1049	rtVfsObjRetainVoid(pThis);
1050	return pThis;
1051	}
1052	return NIL_RTVFSOBJ;
1053	}
1054
1055
1056	RTDECL(RTVFSOBJ) RTVfsObjFromSymlink(RTVFSSYMLINK hVfsSym)
1057	{
1058	if (hVfsSym != NIL_RTVFSSYMLINK)
1059	{
1060	RTVFSOBJINTERNAL *pThis = &hVfsSym->Base;
1061	AssertPtrReturn(pThis, NIL_RTVFSOBJ);
1062	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, NIL_RTVFSOBJ);
1063
1064	rtVfsObjRetainVoid(pThis);
1065	return pThis;
1066	}
1067	return NIL_RTVFSOBJ;
1068	}
1069
1070
1071
1072	RTDECL(int) RTVfsObjQueryInfo(RTVFSOBJ hVfsObj, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
1073	{
1074	RTVFSOBJINTERNAL *pThis = hVfsObj;
1075	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1076	AssertReturn(pThis->uMagic == RTVFSOBJ_MAGIC, VERR_INVALID_HANDLE);
1077
1078	RTVfsLockAcquireRead(pThis->hLock);
1079	int rc = pThis->pOps->pfnQueryInfo(pThis->pvThis, pObjInfo, enmAddAttr);
1080	RTVfsLockReleaseRead(pThis->hLock);
1081	return rc;
1082	}
1083
1084
1085
1086	/*
1087	*
1088	* U T I L U T I L U T I L
1089	* U T I L U T I L U T I L
1090	* U T I L U T I L U T I L
1091	*
1092	*/
1093
1094
1095
1096	/**
1097	* Removes dots from the path.
1098	*
1099	* @returns The new @a pszDst value.
1100	* @param pPath The path parsing buffer.
1101	* @param pszDst The current szPath position. This will be
1102	* updated and returned.
1103	* @param fTheEnd Indicates whether we're at the end of the path
1104	* or not.
1105	* @param piRestartComp The component to restart parsing at.
1106	*/
1107	static char rtVfsParsePathHandleDots(PRTVFSPARSEDPATH pPath, char pszDst, bool fTheEnd, uint16_t *piRestartComp)
1108	{
1109	if (pszDst[-1] != '.')
1110	return pszDst;
1111
1112	if (pszDst[-2] == '/')
1113	{
1114	pPath->cComponents--;
1115	pszDst = &pPath->szPath[pPath->aoffComponents[pPath->cComponents]];
1116	}
1117	else if (pszDst[-2] == '.' && pszDst[-3] == '/')
1118	{
1119	pPath->cComponents -= pPath->cComponents > 1 ? 2 : 1;
1120	pszDst = &pPath->szPath[pPath->aoffComponents[pPath->cComponents]];
1121	if (piRestartComp && *piRestartComp + 1 >= pPath->cComponents)
1122	*piRestartComp = pPath->cComponents > 0 ? pPath->cComponents - 1 : 0;
1123	}
1124	else
1125	return pszDst;
1126
1127	/*
1128	* Drop the trailing slash if we're at the end of the source path.
1129	*/
1130	if (fTheEnd && pPath->cComponents == 0)
1131	pszDst--;
1132	return pszDst;
1133	}
1134
1135
1136	RTDECL(int) RTVfsParsePathAppend(PRTVFSPARSEDPATH pPath, const char pszPath, uint16_t piRestartComp)
1137	{
1138	AssertReturn(*pszPath != '/', VERR_INTERNAL_ERROR_4);
1139
1140	/* In case *piRestartComp was set higher than the number of components
1141	before making the call to this function. */
1142	if (piRestartComp && *piRestartComp + 1 >= pPath->cComponents)
1143	*piRestartComp = pPath->cComponents > 0 ? pPath->cComponents - 1 : 0;
1144
1145	/*
1146	* Append a slash to the destination path if necessary.
1147	*/
1148	char *pszDst = &pPath->szPath[pPath->cch];
1149	if (pPath->cComponents > 0)
1150	{
1151	*pszDst++ = '/';
1152	if (pszDst - &pPath->szPath[0] >= RTVFSPARSEDPATH_MAX)
1153	return VERR_FILENAME_TOO_LONG;
1154	}
1155	Assert(pszDst[-1] == '/');
1156
1157	/*
1158	* Parse and append the relative path.
1159	*/
1160	const char *pszSrc = pszPath;
1161	pPath->fDirSlash = false;
1162	while (pszSrc[0])
1163	{
1164	/* Skip unncessary slashes. */
1165	while (pszSrc[0] == '/')
1166	pszSrc++;
1167
1168	/* Copy until we encounter the next slash. */
1169	pPath->aoffComponents[pPath->cComponents++] = pszDst - &pPath->szPath[0];
1170	while (pszSrc[0])
1171	{
1172	if (pszSrc[0] == '/')
1173	{
1174	pszSrc++;
1175	if (pszSrc[0])
1176	*pszDst++ = '/';
1177	else
1178	pPath->fDirSlash = true;
1179	pszDst = rtVfsParsePathHandleDots(pPath, pszDst, pszSrc[0] == '\0', piRestartComp);
1180	break;
1181	}
1182
1183	pszDst++ = pszSrc++;
1184	if (pszDst - &pPath->szPath[0] >= RTVFSPARSEDPATH_MAX)
1185	return VERR_FILENAME_TOO_LONG;
1186	}
1187	}
1188	pszDst = rtVfsParsePathHandleDots(pPath, pszDst, true /fTheEnd/, piRestartComp);
1189
1190	/* Terminate the string and enter its length. */
1191	pszDst[0] = '\0';
1192	pszDst[1] = '\0'; /* for aoffComponents */
1193	pPath->cch = (uint16_t)(pszDst - &pPath->szPath[0]);
1194	pPath->aoffComponents[pPath->cComponents] = pPath->cch + 1;
1195
1196	return VINF_SUCCESS;
1197	}
1198
1199
1200	RTDECL(int) RTVfsParsePath(PRTVFSPARSEDPATH pPath, const char pszPath, const char pszCwd)
1201	{
1202	if (*pszPath != '/')
1203	{
1204	/*
1205	* Relative, recurse and parse pszCwd first.
1206	*/
1207	int rc = RTVfsParsePath(pPath, pszCwd, NULL /crash if pszCwd is not absolute/);
1208	if (RT_FAILURE(rc))
1209	return rc;
1210	}
1211	else
1212	{
1213	/*
1214	* Make pszPath relative, i.e. set up pPath for the root and skip
1215	* leading slashes in pszPath before appending it.
1216	*/
1217	pPath->cch = 1;
1218	pPath->cComponents = 0;
1219	pPath->fDirSlash = false;
1220	pPath->aoffComponents[0] = 1;
1221	pPath->aoffComponents[1] = 2;
1222	pPath->szPath[0] = '/';
1223	pPath->szPath[1] = '\0';
1224	pPath->szPath[2] = '\0';
1225	while (pszPath[0] == '/')
1226	pszPath++;
1227	if (!pszPath[0])
1228	return VINF_SUCCESS;
1229	}
1230	return RTVfsParsePathAppend(pPath, pszPath, NULL);
1231	}
1232
1233
1234
1235	RTDECL(int) RTVfsParsePathA(const char pszPath, const char pszCwd, PRTVFSPARSEDPATH *ppPath)
1236	{
1237	/*
1238	* Allocate the output buffer and hand the problem to rtVfsParsePath.
1239	*/
1240	int rc;
1241	PRTVFSPARSEDPATH pPath = (PRTVFSPARSEDPATH)RTMemTmpAlloc(sizeof(RTVFSPARSEDPATH));
1242	if (pPath)
1243	{
1244	rc = RTVfsParsePath(pPath, pszPath, pszCwd);
1245	if (RT_FAILURE(rc))
1246	{
1247	RTMemTmpFree(pPath);
1248	pPath = NULL;
1249	}
1250	}
1251	else
1252	rc = VERR_NO_TMP_MEMORY;
1253	ppPath = pPath; / always set it */
1254	return rc;
1255	}
1256
1257
1258	RTDECL(void) RTVfsParsePathFree(PRTVFSPARSEDPATH pPath)
1259	{
1260	if (pPath)
1261	{
1262	pPath->cch = UINT16_MAX;
1263	pPath->cComponents = UINT16_MAX;
1264	pPath->aoffComponents[0] = UINT16_MAX;
1265	pPath->aoffComponents[1] = UINT16_MAX;
1266	RTMemTmpFree(pPath);
1267	}
1268	}
1269
1270
1271	/**
1272	* Handles a symbolic link, adding it to
1273	*
1274	* @returns IPRT status code.
1275	* @param pPath The parsed path to update.
1276	* @param piComponent The component iterator to update.
1277	* @param hSymlink The symbolic link to process.
1278	*/
1279	static int rtVfsTraverseHandleSymlink(PRTVFSPARSEDPATH pPath, uint16_t *piComponent, RTVFSSYMLINK hSymlink)
1280	{
1281	/*
1282	* Read the link.
1283	*/
1284	char szPath[RTPATH_MAX];
1285	int rc = RTVfsSymlinkRead(hSymlink, szPath, sizeof(szPath) - 1);
1286	if (RT_SUCCESS(rc))
1287	{
1288	szPath[sizeof(szPath) - 1] = '\0';
1289	if (szPath[0] == '/')
1290	{
1291	/*
1292	* Absolute symlink.
1293	*/
1294	rc = RTVfsParsePath(pPath, szPath, NULL);
1295	if (RT_SUCCESS(rc))
1296	{
1297	*piComponent = 0;
1298	return VINF_SUCCESS;
1299	}
1300	}
1301	else
1302	{
1303	/*
1304	* Relative symlink, must replace the current component with the
1305	* link value. We do that by using the remainder of the symlink
1306	* buffer as temporary storage.
1307	*/
1308	uint16_t iComponent = *piComponent;
1309	if (iComponent + 1 < pPath->cComponents)
1310	rc = RTPathAppend(szPath, sizeof(szPath), &pPath->szPath[pPath->aoffComponents[iComponent + 1]]);
1311	if (RT_SUCCESS(rc))
1312	{
1313	pPath->cch = pPath->aoffComponents[iComponent] - (iComponent > 0);
1314	pPath->aoffComponents[iComponent + 1] = pPath->cch + 1;
1315	pPath->szPath[pPath->cch] = '\0';
1316	pPath->szPath[pPath->cch + 1] = '\0';
1317
1318	rc = RTVfsParsePathAppend(pPath, szPath, &iComponent);
1319	if (RT_SUCCESS(rc))
1320	{
1321	*piComponent = iComponent;
1322	return VINF_SUCCESS;
1323	}
1324	}
1325	}
1326	}
1327	return rc == VERR_BUFFER_OVERFLOW ? VERR_FILENAME_TOO_LONG : rc;
1328	}
1329
1330
1331	/**
1332	* Internal worker for various open functions as well as RTVfsTraverseToParent.
1333	*
1334	* @returns IPRT status code.
1335	* @param pThis The VFS.
1336	* @param pPath The parsed path. This may be changed as symbolic
1337	* links are processed during the path traversal.
1338	* @param fFollowSymlink Whether to follow the final component if it is a
1339	* symbolic link.
1340	* @param ppVfsParentDir Where to return the parent directory handle
1341	* (referenced).
1342	*/
1343	static int rtVfsTraverseToParent(RTVFSINTERNAL *pThis, PRTVFSPARSEDPATH pPath, bool fFollowSymlink,
1344	RTVFSDIRINTERNAL **ppVfsParentDir)
1345	{
1346	/*
1347	* Assert sanity.
1348	*/
1349	AssertPtr(pThis);
1350	Assert(pThis->uMagic == RTVFS_MAGIC);
1351	Assert(pThis->Base.cRefs > 0);
1352	AssertPtr(pPath);
1353	AssertPtr(ppVfsParentDir);
1354	*ppVfsParentDir = NULL;
1355	AssertReturn(pPath->cComponents > 0, VERR_INTERNAL_ERROR_3);
1356
1357	/*
1358	* Open the root directory.
1359	*/
1360	/** @todo Union mounts, traversal optimization methods, races, ++ */
1361	RTVFSDIRINTERNAL *pCurDir;
1362	RTVfsLockAcquireRead(pThis->Base.hLock);
1363	int rc = pThis->pOps->pfnOpenRoot(pThis->Base.pvThis, &pCurDir);
1364	RTVfsLockReleaseRead(pThis->Base.hLock);
1365	if (RT_FAILURE(rc))
1366	return rc;
1367	Assert(pCurDir->uMagic == RTVFSDIR_MAGIC);
1368
1369	/*
1370	* The traversal loop.
1371	*/
1372	unsigned cLinks = 0;
1373	uint16_t iComponent = 0;
1374	for (;;)
1375	{
1376	/*
1377	* Are we done yet?
1378	*/
1379	bool fFinal = iComponent + 1 >= pPath->cComponents;
1380	if (fFinal && !fFollowSymlink)
1381	{
1382	*ppVfsParentDir = pCurDir;
1383	return VINF_SUCCESS;
1384	}
1385
1386	/*
1387	* Try open the next entry.
1388	*/
1389	const char *pszEntry = &pPath->szPath[pPath->aoffComponents[iComponent]];
1390	char *pszEntryEnd = &pPath->szPath[pPath->aoffComponents[iComponent + 1] - 1];
1391	*pszEntryEnd = '\0';
1392	RTVFSDIR hDir = NIL_RTVFSDIR;
1393	RTVFSSYMLINK hSymlink = NIL_RTVFSSYMLINK;
1394	RTVFS hVfsMnt = NIL_RTVFS;
1395	if (fFinal)
1396	{
1397	RTVfsLockAcquireRead(pCurDir->Base.hLock);
1398	rc = pCurDir->pOps->pfnTraversalOpen(pCurDir->Base.pvThis, pszEntry, NULL, &hSymlink, NULL);
1399	RTVfsLockReleaseRead(pCurDir->Base.hLock);
1400	*pszEntryEnd = '\0';
1401	if (rc == VERR_PATH_NOT_FOUND)
1402	rc = VINF_SUCCESS;
1403	if (RT_FAILURE(rc))
1404	break;
1405
1406	if (hSymlink == NIL_RTVFSSYMLINK)
1407	{
1408	*ppVfsParentDir = pCurDir;
1409	return VINF_SUCCESS;
1410	}
1411	}
1412	else
1413	{
1414	RTVfsLockAcquireRead(pCurDir->Base.hLock);
1415	rc = pCurDir->pOps->pfnTraversalOpen(pCurDir->Base.pvThis, pszEntry, &hDir, &hSymlink, &hVfsMnt);
1416	RTVfsLockReleaseRead(pCurDir->Base.hLock);
1417	*pszEntryEnd = '/';
1418	if (RT_FAILURE(rc))
1419	break;
1420
1421	if ( hDir == NIL_RTVFSDIR
1422	&& hSymlink == NIL_RTVFSSYMLINK
1423	&& hVfsMnt == NIL_RTVFS)
1424	{
1425	rc = VERR_NOT_A_DIRECTORY;
1426	break;
1427	}
1428	}
1429	Assert( (hDir != NIL_RTVFSDIR && hSymlink == NIL_RTVFSSYMLINK && hVfsMnt == NIL_RTVFS)
1430	\|\| (hDir == NIL_RTVFSDIR && hSymlink != NIL_RTVFSSYMLINK && hVfsMnt == NIL_RTVFS)
1431	\|\| (hDir == NIL_RTVFSDIR && hSymlink == NIL_RTVFSSYMLINK && hVfsMnt != NIL_RTVFS));
1432
1433	if (hDir != NIL_RTVFSDIR)
1434	{
1435	/*
1436	* Directory - advance down the path.
1437	*/
1438	AssertPtr(hDir);
1439	Assert(hDir->uMagic == RTVFSDIR_MAGIC);
1440	RTVfsDirRelease(pCurDir);
1441	pCurDir = hDir;
1442	iComponent++;
1443	}
1444	else if (hSymlink != NIL_RTVFSSYMLINK)
1445	{
1446	/*
1447	* Symbolic link - deal with it and retry the current component.
1448	*/
1449	AssertPtr(hSymlink);
1450	Assert(hSymlink->uMagic == RTVFSSYMLINK_MAGIC);
1451	cLinks++;
1452	if (cLinks >= RTVFS_MAX_LINKS)
1453	{
1454	rc = VERR_TOO_MANY_SYMLINKS;
1455	break;
1456	}
1457	uint16_t iRestartComp = iComponent;
1458	rc = rtVfsTraverseHandleSymlink(pPath, &iRestartComp, hSymlink);
1459	if (RT_FAILURE(rc))
1460	break;
1461	if (iRestartComp != iComponent)
1462	{
1463	/* Must restart from the root (optimize this). */
1464	RTVfsDirRelease(pCurDir);
1465	RTVfsLockAcquireRead(pThis->Base.hLock);
1466	rc = pThis->pOps->pfnOpenRoot(pThis->Base.pvThis, &pCurDir);
1467	RTVfsLockReleaseRead(pThis->Base.hLock);
1468	if (RT_FAILURE(rc))
1469	{
1470	pCurDir = NULL;
1471	break;
1472	}
1473	iComponent = 0;
1474	}
1475	}
1476	else
1477	{
1478	/*
1479	* Mount point - deal with it and retry the current component.
1480	*/
1481	RTVfsDirRelease(pCurDir);
1482	RTVfsLockAcquireRead(hVfsMnt->Base.hLock);
1483	rc = pThis->pOps->pfnOpenRoot(hVfsMnt->Base.pvThis, &pCurDir);
1484	RTVfsLockReleaseRead(hVfsMnt->Base.hLock);
1485	if (RT_FAILURE(rc))
1486	{
1487	pCurDir = NULL;
1488	break;
1489	}
1490	iComponent = 0;
1491	/** @todo union mounts. */
1492	}
1493	}
1494
1495	if (pCurDir)
1496	RTVfsDirRelease(pCurDir);
1497
1498	return rc;
1499	}
1500
1501
1502	RTDECL(int) RTVfsUtilDummyPollOne(uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr, uint32_t *pfRetEvents)
1503	{
1504	NOREF(fEvents);
1505	int rc;
1506	if (fIntr)
1507	rc = RTThreadSleep(cMillies);
1508	else
1509	{
1510	uint64_t uMsStart = RTTimeMilliTS();
1511	do
1512	rc = RTThreadSleep(cMillies);
1513	while ( rc == VERR_INTERRUPTED
1514	&& !fIntr
1515	&& RTTimeMilliTS() - uMsStart < cMillies);
1516	if (rc == VERR_INTERRUPTED)
1517	rc = VERR_TIMEOUT;
1518	}
1519
1520	*pfRetEvents = 0;
1521	return rc;
1522	}
1523
1524
1525	RTDECL(int) RTVfsUtilPumpIoStreams(RTVFSIOSTREAM hVfsIosSrc, RTVFSIOSTREAM hVfsIosDst, size_t cbBufHint)
1526	{
1527	/*
1528	* Allocate a temporary buffer.
1529	*/
1530	size_t cbBuf = cbBufHint;
1531	if (!cbBuf)
1532	cbBuf = _64K;
1533	else if (cbBuf < _4K)
1534	cbBuf = _4K;
1535	else if (cbBuf > _1M)
1536	cbBuf = _1M;
1537
1538	void *pvBuf = RTMemTmpAlloc(cbBuf);
1539	if (!pvBuf)
1540	{
1541	cbBuf = _4K;
1542	pvBuf = RTMemTmpAlloc(cbBuf);
1543	if (!pvBuf)
1544	return VERR_NO_TMP_MEMORY;
1545	}
1546
1547	/*
1548	* Pump loop.
1549	*/
1550	int rc;
1551	for (;;)
1552	{
1553	size_t cbRead;
1554	rc = RTVfsIoStrmRead(hVfsIosSrc, pvBuf, cbBuf, true /fBlocking/, &cbRead);
1555	if (RT_FAILURE(rc))
1556	break;
1557	if (rc == VINF_EOF && cbRead == 0)
1558	break;
1559
1560	rc = RTVfsIoStrmWrite(hVfsIosDst, pvBuf, cbRead, true /fBlocking/, NULL /cbWritten/);
1561	if (RT_FAILURE(rc))
1562	break;
1563	}
1564
1565	RTMemTmpFree(pvBuf);
1566
1567	/*
1568	* Flush the destination stream on success to make sure we've caught
1569	* errors caused by buffering delays.
1570	*/
1571	if (RT_SUCCESS(rc))
1572	rc = RTVfsIoStrmFlush(hVfsIosDst);
1573
1574	return rc;
1575	}
1576
1577
1578
1579
1580
1581	/*
1582	* F I L E S Y S T E M R O O T
1583	* F I L E S Y S T E M R O O T
1584	* F I L E S Y S T E M R O O T
1585	*/
1586
1587
1588	RTDECL(int) RTVfsNew(PCRTVFSOPS pVfsOps, size_t cbInstance, RTVFS hVfs, RTVFSLOCK hLock,
1589	PRTVFS phVfs, void **ppvInstance)
1590	{
1591	/*
1592	* Validate the input, be extra strict in strict builds.
1593	*/
1594	AssertPtr(pVfsOps);
1595	AssertReturn(pVfsOps->uVersion == RTVFSOPS_VERSION, VERR_VERSION_MISMATCH);
1596	AssertReturn(pVfsOps->uEndMarker == RTVFSOPS_VERSION, VERR_VERSION_MISMATCH);
1597	Assert(cbInstance > 0);
1598	AssertPtr(ppvInstance);
1599	AssertPtr(phVfs);
1600
1601	/*
1602	* Allocate the handle + instance data.
1603	*/
1604	size_t const cbThis = RT_ALIGN_Z(sizeof(RTVFSINTERNAL), RTVFS_INST_ALIGNMENT)
1605	+ RT_ALIGN_Z(cbInstance, RTVFS_INST_ALIGNMENT);
1606	RTVFSINTERNAL pThis = (RTVFSINTERNAL )RTMemAllocZ(cbThis);
1607	if (!pThis)
1608	return VERR_NO_MEMORY;
1609
1610	int rc = rtVfsObjInitNewObject(&pThis->Base, NULL, hVfs, hLock,
1611	(char )pThis + RT_ALIGN_Z(sizeof(pThis), RTVFS_INST_ALIGNMENT));
1612	if (RT_FAILURE(rc))
1613	{
1614	RTMemFree(pThis);
1615	return rc;
1616	}
1617
1618	pThis->uMagic = RTVFS_MAGIC;
1619	pThis->pOps = pVfsOps;
1620
1621	*phVfs = pThis;
1622	*ppvInstance = pThis->Base.pvThis;
1623	return VINF_SUCCESS;
1624	}
1625
1626
1627	RTDECL(uint32_t) RTVfsRetain(RTVFS hVfs)
1628	{
1629	RTVFSINTERNAL *pThis = hVfs;
1630	AssertPtrReturn(pThis, UINT32_MAX);
1631	AssertReturn(pThis->uMagic == RTVFS_MAGIC, UINT32_MAX);
1632	return rtVfsObjRetain(&pThis->Base);
1633	}
1634
1635
1636	RTDECL(uint32_t) RTVfsRelease(RTVFS hVfs)
1637	{
1638	RTVFSINTERNAL *pThis = hVfs;
1639	if (pThis == NIL_RTVFS)
1640	return 0;
1641	AssertPtrReturn(pThis, UINT32_MAX);
1642	AssertReturn(pThis->uMagic == RTVFS_MAGIC, UINT32_MAX);
1643	return rtVfsObjRelease(&pThis->Base);
1644	}
1645
1646
1647	RTDECL(int) RTVfsIsRangeInUse(RTVFS hVfs, uint64_t off, size_t cb,
1648	bool *pfUsed)
1649	{
1650	RTVFSINTERNAL *pThis = hVfs;
1651	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1652	AssertReturn(pThis->uMagic == RTVFS_MAGIC, VERR_INVALID_HANDLE);
1653
1654	RTVfsLockAcquireWrite(pThis->Base.hLock);
1655	int rc = pThis->pOps->pfnIsRangeInUse(pThis->Base.pvThis, off, cb, pfUsed);
1656	RTVfsLockReleaseWrite(pThis->Base.hLock);
1657
1658	return rc;
1659	}
1660
1661
1662	/*
1663	*
1664	* F I L E S Y S T E M S T R E A M
1665	* F I L E S Y S T E M S T R E A M
1666	* F I L E S Y S T E M S T R E A M
1667	*
1668	*/
1669
1670
1671	RTDECL(int) RTVfsNewFsStream(PCRTVFSFSSTREAMOPS pFsStreamOps, size_t cbInstance, RTVFS hVfs, RTVFSLOCK hLock,
1672	PRTVFSFSSTREAM phVfsFss, void **ppvInstance)
1673	{
1674	/*
1675	* Validate the input, be extra strict in strict builds.
1676	*/
1677	AssertPtr(pFsStreamOps);
1678	AssertReturn(pFsStreamOps->uVersion == RTVFSFSSTREAMOPS_VERSION, VERR_VERSION_MISMATCH);
1679	AssertReturn(pFsStreamOps->uEndMarker == RTVFSFSSTREAMOPS_VERSION, VERR_VERSION_MISMATCH);
1680	Assert(!pFsStreamOps->fReserved);
1681	RTVFSOBJ_ASSERT_OPS(&pFsStreamOps->Obj, RTVFSOBJTYPE_FS_STREAM);
1682	AssertPtr(pFsStreamOps->pfnNext);
1683	Assert(cbInstance > 0);
1684	AssertPtr(ppvInstance);
1685	AssertPtr(phVfsFss);
1686	RTVFS_ASSERT_VALID_HANDLE_OR_NIL_RETURN(hVfs, VERR_INVALID_HANDLE);
1687
1688	/*
1689	* Allocate the handle + instance data.
1690	*/
1691	size_t const cbThis = RT_ALIGN_Z(sizeof(RTVFSFSSTREAMINTERNAL), RTVFS_INST_ALIGNMENT)
1692	+ RT_ALIGN_Z(cbInstance, RTVFS_INST_ALIGNMENT);
1693	RTVFSFSSTREAMINTERNAL pThis = (RTVFSFSSTREAMINTERNAL )RTMemAllocZ(cbThis);
1694	if (!pThis)
1695	return VERR_NO_MEMORY;
1696
1697	int rc = rtVfsObjInitNewObject(&pThis->Base, &pFsStreamOps->Obj, hVfs, hLock,
1698	(char )pThis + RT_ALIGN_Z(sizeof(pThis), RTVFS_INST_ALIGNMENT));
1699
1700	if (RT_FAILURE(rc))
1701	{
1702	RTMemFree(pThis);
1703	return rc;
1704	}
1705
1706	pThis->uMagic = RTVFSFSSTREAM_MAGIC;
1707	pThis->fFlags = RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE;
1708	pThis->pOps = pFsStreamOps;
1709
1710	*phVfsFss = pThis;
1711	*ppvInstance = pThis->Base.pvThis;
1712	return VINF_SUCCESS;
1713	}
1714
1715
1716	RTDECL(uint32_t) RTVfsFsStrmRetain(RTVFSFSSTREAM hVfsFss)
1717	{
1718	RTVFSFSSTREAMINTERNAL *pThis = hVfsFss;
1719	AssertPtrReturn(pThis, UINT32_MAX);
1720	AssertReturn(pThis->uMagic == RTVFSFSSTREAM_MAGIC, UINT32_MAX);
1721	return rtVfsObjRetain(&pThis->Base);
1722	}
1723
1724
1725	RTDECL(uint32_t) RTVfsFsStrmRelease(RTVFSFSSTREAM hVfsFss)
1726	{
1727	RTVFSFSSTREAMINTERNAL *pThis = hVfsFss;
1728	if (pThis == NIL_RTVFSFSSTREAM)
1729	return 0;
1730	AssertPtrReturn(pThis, UINT32_MAX);
1731	AssertReturn(pThis->uMagic == RTVFSFSSTREAM_MAGIC, UINT32_MAX);
1732	return rtVfsObjRelease(&pThis->Base);
1733	}
1734
1735
1736	RTDECL(int) RTVfsFsStrmQueryInfo(RTVFSFSSTREAM hVfsFss, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
1737	{
1738	RTVFSFSSTREAMINTERNAL *pThis = hVfsFss;
1739	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1740	AssertReturn(pThis->uMagic == RTVFSFSSTREAM_MAGIC, VERR_INVALID_HANDLE);
1741	return RTVfsObjQueryInfo(&pThis->Base, pObjInfo, enmAddAttr);
1742	}
1743
1744
1745	RTDECL(int) RTVfsFsStrmNext(RTVFSFSSTREAM hVfsFss, char *ppszName, RTVFSOBJTYPE penmType, PRTVFSOBJ phVfsObj)
1746	{
1747	RTVFSFSSTREAMINTERNAL *pThis = hVfsFss;
1748	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1749	AssertReturn(pThis->uMagic == RTVFSFSSTREAM_MAGIC, VERR_INVALID_HANDLE);
1750	AssertPtrNullReturn(ppszName, VERR_INVALID_POINTER);
1751	if (ppszName)
1752	*ppszName = NULL;
1753	AssertPtrNullReturn(penmType, VERR_INVALID_POINTER);
1754	if (penmType)
1755	*penmType = RTVFSOBJTYPE_INVALID;
1756	AssertPtrNullReturn(penmType, VERR_INVALID_POINTER);
1757	if (phVfsObj)
1758	*phVfsObj = NIL_RTVFSOBJ;
1759
1760	return pThis->pOps->pfnNext(pThis->Base.pvThis, ppszName, penmType, phVfsObj);
1761	}
1762
1763
1764
1765
1766	/*
1767	*
1768	* D I R D I R D I R
1769	* D I R D I R D I R
1770	* D I R D I R D I R
1771	*
1772	*/
1773
1774	RTDECL(uint32_t) RTVfsDirRetain(RTVFSDIR hVfsDir)
1775	{
1776	RTVFSDIRINTERNAL *pThis = hVfsDir;
1777	AssertPtrReturn(pThis, UINT32_MAX);
1778	AssertReturn(pThis->uMagic == RTVFSDIR_MAGIC, UINT32_MAX);
1779	return rtVfsObjRetain(&pThis->Base);
1780	}
1781
1782
1783	RTDECL(uint32_t) RTVfsDirRelease(RTVFSDIR hVfsDir)
1784	{
1785	RTVFSDIRINTERNAL *pThis = hVfsDir;
1786	if (pThis == NIL_RTVFSDIR)
1787	return 0;
1788	AssertPtrReturn(pThis, UINT32_MAX);
1789	AssertReturn(pThis->uMagic == RTVFSDIR_MAGIC, UINT32_MAX);
1790	return rtVfsObjRelease(&pThis->Base);
1791	}
1792
1793
1794
1795	/*
1796	*
1797	* S Y M B O L I C L I N K
1798	* S Y M B O L I C L I N K
1799	* S Y M B O L I C L I N K
1800	*
1801	*/
1802
1803	RTDECL(int) RTVfsNewSymlink(PCRTVFSSYMLINKOPS pSymlinkOps, size_t cbInstance, RTVFS hVfs, RTVFSLOCK hLock,
1804	PRTVFSSYMLINK phVfsSym, void **ppvInstance)
1805	{
1806	/*
1807	* Validate the input, be extra strict in strict builds.
1808	*/
1809	AssertPtr(pSymlinkOps);
1810	AssertReturn(pSymlinkOps->uVersion == RTVFSSYMLINKOPS_VERSION, VERR_VERSION_MISMATCH);
1811	AssertReturn(pSymlinkOps->uEndMarker == RTVFSSYMLINKOPS_VERSION, VERR_VERSION_MISMATCH);
1812	Assert(!pSymlinkOps->fReserved);
1813	RTVFSSYMLINK_ASSERT_OPS(pSymlinkOps, RTVFSOBJTYPE_SYMLINK);
1814	Assert(cbInstance > 0);
1815	AssertPtr(ppvInstance);
1816	AssertPtr(phVfsSym);
1817	RTVFS_ASSERT_VALID_HANDLE_OR_NIL_RETURN(hVfs, VERR_INVALID_HANDLE);
1818
1819	/*
1820	* Allocate the handle + instance data.
1821	*/
1822	size_t const cbThis = RT_ALIGN_Z(sizeof(RTVFSSYMLINKINTERNAL), RTVFS_INST_ALIGNMENT)
1823	+ RT_ALIGN_Z(cbInstance, RTVFS_INST_ALIGNMENT);
1824	RTVFSSYMLINKINTERNAL pThis = (RTVFSSYMLINKINTERNAL )RTMemAllocZ(cbThis);
1825	if (!pThis)
1826	return VERR_NO_MEMORY;
1827
1828	int rc = rtVfsObjInitNewObject(&pThis->Base, &pSymlinkOps->Obj, hVfs, hLock,
1829	(char )pThis + RT_ALIGN_Z(sizeof(pThis), RTVFS_INST_ALIGNMENT));
1830	if (RT_FAILURE(rc))
1831	{
1832	RTMemFree(pThis);
1833	return rc;
1834	}
1835
1836	pThis->uMagic = RTVFSSYMLINK_MAGIC;
1837	pThis->pOps = pSymlinkOps;
1838
1839	*phVfsSym = pThis;
1840	*ppvInstance = pThis->Base.pvThis;
1841	return VINF_SUCCESS;
1842	}
1843
1844
1845	RTDECL(uint32_t) RTVfsSymlinkRetain(RTVFSSYMLINK hVfsSym)
1846	{
1847	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1848	AssertPtrReturn(pThis, UINT32_MAX);
1849	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, UINT32_MAX);
1850	return rtVfsObjRetain(&pThis->Base);
1851	}
1852
1853
1854	RTDECL(uint32_t) RTVfsSymlinkRelease(RTVFSSYMLINK hVfsSym)
1855	{
1856	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1857	if (pThis == NIL_RTVFSSYMLINK)
1858	return 0;
1859	AssertPtrReturn(pThis, UINT32_MAX);
1860	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, UINT32_MAX);
1861	return rtVfsObjRelease(&pThis->Base);
1862	}
1863
1864
1865	RTDECL(int) RTVfsSymlinkQueryInfo(RTVFSSYMLINK hVfsSym, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
1866	{
1867	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1868	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1869	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, VERR_INVALID_HANDLE);
1870	return RTVfsObjQueryInfo(&pThis->Base, pObjInfo, enmAddAttr);
1871	}
1872
1873
1874	RTDECL(int) RTVfsSymlinkSetMode(RTVFSSYMLINK hVfsSym, RTFMODE fMode, RTFMODE fMask)
1875	{
1876	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1877	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1878	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, VERR_INVALID_HANDLE);
1879
1880	fMode = rtFsModeNormalize(fMode, NULL, 0);
1881	if (!rtFsModeIsValid(fMode))
1882	return VERR_INVALID_PARAMETER;
1883
1884	RTVfsLockAcquireWrite(pThis->Base.hLock);
1885	int rc = pThis->pOps->ObjSet.pfnSetMode(pThis->Base.pvThis, fMode, fMask);
1886	RTVfsLockReleaseWrite(pThis->Base.hLock);
1887	return rc;
1888	}
1889
1890
1891	RTDECL(int) RTVfsSymlinkSetTimes(RTVFSSYMLINK hVfsSym, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
1892	PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
1893	{
1894	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1895	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1896	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, VERR_INVALID_HANDLE);
1897
1898	AssertPtrNullReturn(pAccessTime, VERR_INVALID_POINTER);
1899	AssertPtrNullReturn(pModificationTime, VERR_INVALID_POINTER);
1900	AssertPtrNullReturn(pChangeTime, VERR_INVALID_POINTER);
1901	AssertPtrNullReturn(pBirthTime, VERR_INVALID_POINTER);
1902
1903	RTVfsLockAcquireWrite(pThis->Base.hLock);
1904	int rc = pThis->pOps->ObjSet.pfnSetTimes(pThis->Base.pvThis, pAccessTime, pModificationTime, pChangeTime, pBirthTime);
1905	RTVfsLockReleaseWrite(pThis->Base.hLock);
1906	return rc;
1907	}
1908
1909
1910	RTDECL(int) RTVfsSymlinkSetOwner(RTVFSSYMLINK hVfsSym, RTUID uid, RTGID gid)
1911	{
1912	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1913	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1914	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, VERR_INVALID_HANDLE);
1915
1916	RTVfsLockAcquireWrite(pThis->Base.hLock);
1917	int rc = pThis->pOps->ObjSet.pfnSetOwner(pThis->Base.pvThis, uid, gid);
1918	RTVfsLockReleaseWrite(pThis->Base.hLock);
1919	return rc;
1920	}
1921
1922
1923	RTDECL(int) RTVfsSymlinkRead(RTVFSSYMLINK hVfsSym, char *pszTarget, size_t cbTarget)
1924	{
1925	RTVFSSYMLINKINTERNAL *pThis = hVfsSym;
1926	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1927	AssertReturn(pThis->uMagic == RTVFSSYMLINK_MAGIC, VERR_INVALID_HANDLE);
1928
1929	RTVfsLockAcquireWrite(pThis->Base.hLock);
1930	int rc = pThis->pOps->pfnRead(pThis->Base.pvThis, pszTarget, cbTarget);
1931	RTVfsLockReleaseWrite(pThis->Base.hLock);
1932
1933	return rc;
1934	}
1935
1936
1937
1938	/*
1939	*
1940	* I / O S T R E A M I / O S T R E A M I / O S T R E A M
1941	* I / O S T R E A M I / O S T R E A M I / O S T R E A M
1942	* I / O S T R E A M I / O S T R E A M I / O S T R E A M
1943	*
1944	*/
1945
1946	RTDECL(int) RTVfsNewIoStream(PCRTVFSIOSTREAMOPS pIoStreamOps, size_t cbInstance, uint32_t fOpen, RTVFS hVfs, RTVFSLOCK hLock,
1947	PRTVFSIOSTREAM phVfsIos, void **ppvInstance)
1948	{
1949	/*
1950	* Validate the input, be extra strict in strict builds.
1951	*/
1952	AssertPtr(pIoStreamOps);
1953	AssertReturn(pIoStreamOps->uVersion == RTVFSIOSTREAMOPS_VERSION, VERR_VERSION_MISMATCH);
1954	AssertReturn(pIoStreamOps->uEndMarker == RTVFSIOSTREAMOPS_VERSION, VERR_VERSION_MISMATCH);
1955	Assert(!(pIoStreamOps->fFeatures & ~RTVFSIOSTREAMOPS_FEAT_VALID_MASK));
1956	RTVFSIOSTREAM_ASSERT_OPS(pIoStreamOps, RTVFSOBJTYPE_IO_STREAM);
1957	Assert(cbInstance > 0);
1958	Assert(fOpen & RTFILE_O_ACCESS_MASK);
1959	AssertPtr(ppvInstance);
1960	AssertPtr(phVfsIos);
1961	RTVFS_ASSERT_VALID_HANDLE_OR_NIL_RETURN(hVfs, VERR_INVALID_HANDLE);
1962
1963	/*
1964	* Allocate the handle + instance data.
1965	*/
1966	size_t const cbThis = RT_ALIGN_Z(sizeof(RTVFSIOSTREAMINTERNAL), RTVFS_INST_ALIGNMENT)
1967	+ RT_ALIGN_Z(cbInstance, RTVFS_INST_ALIGNMENT);
1968	RTVFSIOSTREAMINTERNAL pThis = (RTVFSIOSTREAMINTERNAL )RTMemAllocZ(cbThis);
1969	if (!pThis)
1970	return VERR_NO_MEMORY;
1971
1972	int rc = rtVfsObjInitNewObject(&pThis->Base, &pIoStreamOps->Obj, hVfs, hLock,
1973	(char )pThis + RT_ALIGN_Z(sizeof(pThis), RTVFS_INST_ALIGNMENT));
1974	if (RT_FAILURE(rc))
1975	{
1976	RTMemFree(pThis);
1977	return rc;
1978	}
1979
1980	pThis->uMagic = RTVFSIOSTREAM_MAGIC;
1981	pThis->fFlags = fOpen;
1982	pThis->pOps = pIoStreamOps;
1983
1984	*phVfsIos = pThis;
1985	*ppvInstance = pThis->Base.pvThis;
1986	return VINF_SUCCESS;
1987	}
1988
1989
1990	RTDECL(void *) RTVfsIoStreamToPrivate(RTVFSIOSTREAM hVfsIos, PCRTVFSIOSTREAMOPS pIoStreamOps)
1991	{
1992	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
1993	AssertPtrReturn(pThis, NULL);
1994	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, NULL);
1995	if (pThis->pOps != pIoStreamOps)
1996	return NULL;
1997	return pThis->Base.pvThis;
1998	}
1999
2000
2001	RTDECL(uint32_t) RTVfsIoStrmRetain(RTVFSIOSTREAM hVfsIos)
2002	{
2003	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2004	AssertPtrReturn(pThis, UINT32_MAX);
2005	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, UINT32_MAX);
2006	return rtVfsObjRetain(&pThis->Base);
2007	}
2008
2009
2010	RTDECL(uint32_t) RTVfsIoStrmRelease(RTVFSIOSTREAM hVfsIos)
2011	{
2012	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2013	if (pThis == NIL_RTVFSIOSTREAM)
2014	return 0;
2015	AssertPtrReturn(pThis, UINT32_MAX);
2016	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, UINT32_MAX);
2017	return rtVfsObjRelease(&pThis->Base);
2018	}
2019
2020
2021	RTDECL(RTVFSFILE) RTVfsIoStrmToFile(RTVFSIOSTREAM hVfsIos)
2022	{
2023	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2024	AssertPtrReturn(pThis, NIL_RTVFSFILE);
2025	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, NIL_RTVFSFILE);
2026
2027	if (pThis->pOps->Obj.enmType == RTVFSOBJTYPE_FILE)
2028	{
2029	rtVfsObjRetainVoid(&pThis->Base);
2030	return RT_FROM_MEMBER(pThis, RTVFSFILEINTERNAL, Stream);
2031	}
2032
2033	/* this is no crime, so don't assert. */
2034	return NIL_RTVFSFILE;
2035	}
2036
2037
2038	RTDECL(int) RTVfsIoStrmQueryInfo(RTVFSIOSTREAM hVfsIos, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
2039	{
2040	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2041	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2042	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2043	return RTVfsObjQueryInfo(&pThis->Base, pObjInfo, enmAddAttr);
2044	}
2045
2046
2047	RTDECL(int) RTVfsIoStrmRead(RTVFSIOSTREAM hVfsIos, void pvBuf, size_t cbToRead, bool fBlocking, size_t pcbRead)
2048	{
2049	AssertPtrNullReturn(pcbRead, VERR_INVALID_POINTER);
2050	if (pcbRead)
2051	*pcbRead = 0;
2052	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2053	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2054	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2055	AssertReturn(fBlocking \|\| pcbRead, VERR_INVALID_PARAMETER);
2056	AssertReturn(pThis->fFlags & RTFILE_O_READ, VERR_ACCESS_DENIED);
2057
2058	RTSGSEG Seg = { pvBuf, cbToRead };
2059	RTSGBUF SgBuf;
2060	RTSgBufInit(&SgBuf, &Seg, 1);
2061
2062	RTVfsLockAcquireWrite(pThis->Base.hLock);
2063	int rc = pThis->pOps->pfnRead(pThis->Base.pvThis, -1 /off/, &SgBuf, fBlocking, pcbRead);
2064	RTVfsLockReleaseWrite(pThis->Base.hLock);
2065	return rc;
2066	}
2067
2068
2069	RTDECL(int) RTVfsIoStrmReadAt(RTVFSIOSTREAM hVfsIos, RTFOFF off, void *pvBuf, size_t cbToRead,
2070	bool fBlocking, size_t *pcbRead)
2071	{
2072	AssertPtrNullReturn(pcbRead, VERR_INVALID_POINTER);
2073	if (pcbRead)
2074	*pcbRead = 0;
2075	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2076	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2077	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2078	AssertReturn(fBlocking \|\| pcbRead, VERR_INVALID_PARAMETER);
2079	AssertReturn(pThis->fFlags & RTFILE_O_READ, VERR_ACCESS_DENIED);
2080
2081	RTSGSEG Seg = { pvBuf, cbToRead };
2082	RTSGBUF SgBuf;
2083	RTSgBufInit(&SgBuf, &Seg, 1);
2084
2085	RTVfsLockAcquireWrite(pThis->Base.hLock);
2086	int rc = pThis->pOps->pfnRead(pThis->Base.pvThis, off, &SgBuf, fBlocking, pcbRead);
2087	RTVfsLockReleaseWrite(pThis->Base.hLock);
2088	return rc;
2089	}
2090
2091
2092	RTDECL(int) RTVfsIoStrmWrite(RTVFSIOSTREAM hVfsIos, const void pvBuf, size_t cbToWrite, bool fBlocking, size_t pcbWritten)
2093	{
2094	AssertPtrNullReturn(pcbWritten, VERR_INVALID_POINTER);
2095	if (pcbWritten)
2096	*pcbWritten = 0;
2097	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2098	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2099	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2100	AssertReturn(fBlocking \|\| pcbWritten, VERR_INVALID_PARAMETER);
2101	AssertReturn(pThis->fFlags & RTFILE_O_WRITE, VERR_ACCESS_DENIED);
2102
2103	RTSGSEG Seg = { (void *)pvBuf, cbToWrite };
2104	RTSGBUF SgBuf;
2105	RTSgBufInit(&SgBuf, &Seg, 1);
2106
2107	RTVfsLockAcquireWrite(pThis->Base.hLock);
2108	int rc = pThis->pOps->pfnWrite(pThis->Base.pvThis, -1 /off/, &SgBuf, fBlocking, pcbWritten);
2109	RTVfsLockReleaseWrite(pThis->Base.hLock);
2110	return rc;
2111	}
2112
2113
2114	RTDECL(int) RTVfsIoStrmWriteAt(RTVFSIOSTREAM hVfsIos, RTFOFF off, const void *pvBuf, size_t cbToWrite,
2115	bool fBlocking, size_t *pcbWritten)
2116	{
2117	AssertPtrNullReturn(pcbWritten, VERR_INVALID_POINTER);
2118	if (pcbWritten)
2119	*pcbWritten = 0;
2120	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2121	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2122	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2123	AssertReturn(fBlocking \|\| pcbWritten, VERR_INVALID_PARAMETER);
2124	AssertReturn(pThis->fFlags & RTFILE_O_WRITE, VERR_ACCESS_DENIED);
2125
2126	RTSGSEG Seg = { (void *)pvBuf, cbToWrite };
2127	RTSGBUF SgBuf;
2128	RTSgBufInit(&SgBuf, &Seg, 1);
2129
2130	RTVfsLockAcquireWrite(pThis->Base.hLock);
2131	int rc = pThis->pOps->pfnWrite(pThis->Base.pvThis, off, &SgBuf, fBlocking, pcbWritten);
2132	RTVfsLockReleaseWrite(pThis->Base.hLock);
2133	return rc;
2134	}
2135
2136
2137	RTDECL(int) RTVfsIoStrmSgRead(RTVFSIOSTREAM hVfsIos, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbRead)
2138	{
2139	AssertPtrNullReturn(pcbRead, VERR_INVALID_POINTER);
2140	if (pcbRead)
2141	*pcbRead = 0;
2142	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2143	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2144	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2145	AssertPtr(pSgBuf);
2146	AssertReturn(fBlocking \|\| pcbRead, VERR_INVALID_PARAMETER);
2147	AssertReturn(pThis->fFlags & RTFILE_O_READ, VERR_ACCESS_DENIED);
2148
2149	RTVfsLockAcquireWrite(pThis->Base.hLock);
2150	int rc;
2151	if (!(pThis->pOps->fFeatures & RTVFSIOSTREAMOPS_FEAT_NO_SG))
2152	rc = pThis->pOps->pfnRead(pThis->Base.pvThis, -1 /off/, pSgBuf, fBlocking, pcbRead);
2153	else
2154	{
2155	size_t cbRead = 0;
2156	rc = VINF_SUCCESS;
2157
2158	for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
2159	{
2160	RTSGBUF SgBuf;
2161	RTSgBufInit(&SgBuf, &pSgBuf->paSegs[iSeg], 1);
2162
2163	size_t cbReadSeg = pcbRead ? 0 : pSgBuf->paSegs[iSeg].cbSeg;
2164	rc = pThis->pOps->pfnRead(pThis->Base.pvThis, -1 /off/, &SgBuf, fBlocking, pcbRead ? &cbReadSeg : NULL);
2165	if (RT_FAILURE(rc))
2166	break;
2167	cbRead += cbReadSeg;
2168	if ((pcbRead && cbReadSeg != SgBuf.paSegs[0].cbSeg) \|\| rc != VINF_SUCCESS)
2169	break;
2170	}
2171
2172	if (pcbRead)
2173	*pcbRead = cbRead;
2174	}
2175	RTVfsLockReleaseWrite(pThis->Base.hLock);
2176	return rc;
2177	}
2178
2179
2180	RTDECL(int) RTVfsIoStrmSgWrite(RTVFSIOSTREAM hVfsIos, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbWritten)
2181	{
2182	AssertPtrNullReturn(pcbWritten, VERR_INVALID_POINTER);
2183	if (pcbWritten)
2184	*pcbWritten = 0;
2185	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2186	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2187	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2188	AssertPtr(pSgBuf);
2189	AssertReturn(fBlocking \|\| pcbWritten, VERR_INVALID_PARAMETER);
2190	AssertReturn(pThis->fFlags & RTFILE_O_WRITE, VERR_ACCESS_DENIED);
2191
2192	RTVfsLockAcquireWrite(pThis->Base.hLock);
2193	int rc;
2194	if (!(pThis->pOps->fFeatures & RTVFSIOSTREAMOPS_FEAT_NO_SG))
2195	rc = pThis->pOps->pfnWrite(pThis->Base.pvThis, -1 /off/, pSgBuf, fBlocking, pcbWritten);
2196	else
2197	{
2198	size_t cbWritten = 0;
2199	rc = VINF_SUCCESS;
2200
2201	for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
2202	{
2203	RTSGBUF SgBuf;
2204	RTSgBufInit(&SgBuf, &pSgBuf->paSegs[iSeg], 1);
2205
2206	size_t cbWrittenSeg = 0;
2207	rc = pThis->pOps->pfnWrite(pThis->Base.pvThis, -1 /off/, &SgBuf, fBlocking, pcbWritten ? &cbWrittenSeg : NULL);
2208	if (RT_FAILURE(rc))
2209	break;
2210	if (pcbWritten)
2211	{
2212	cbWritten += cbWrittenSeg;
2213	if (cbWrittenSeg != SgBuf.paSegs[0].cbSeg)
2214	break;
2215	}
2216	}
2217
2218	if (pcbWritten)
2219	*pcbWritten = cbWritten;
2220	}
2221	RTVfsLockReleaseWrite(pThis->Base.hLock);
2222	return rc;
2223	}
2224
2225
2226	RTDECL(int) RTVfsIoStrmFlush(RTVFSIOSTREAM hVfsIos)
2227	{
2228	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2229	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2230	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2231
2232	RTVfsLockAcquireWrite(pThis->Base.hLock);
2233	int rc = pThis->pOps->pfnFlush(pThis->Base.pvThis);
2234	RTVfsLockReleaseWrite(pThis->Base.hLock);
2235	return rc;
2236	}
2237
2238
2239	RTDECL(int) RTVfsIoStrmPoll(RTVFSIOSTREAM hVfsIos, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr,
2240	uint32_t *pfRetEvents)
2241	{
2242	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2243	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2244	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, VERR_INVALID_HANDLE);
2245
2246	RTVfsLockAcquireWrite(pThis->Base.hLock);
2247	int rc = pThis->pOps->pfnPollOne(pThis->Base.pvThis, fEvents, cMillies, fIntr, pfRetEvents);
2248	RTVfsLockReleaseWrite(pThis->Base.hLock);
2249	return rc;
2250	}
2251
2252
2253	RTDECL(RTFOFF) RTVfsIoStrmTell(RTVFSIOSTREAM hVfsIos)
2254	{
2255	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2256	AssertPtrReturn(pThis, -1);
2257	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, -1);
2258
2259	RTFOFF off;
2260	RTVfsLockAcquireRead(pThis->Base.hLock);
2261	int rc = pThis->pOps->pfnTell(pThis->Base.pvThis, &off);
2262	RTVfsLockReleaseRead(pThis->Base.hLock);
2263	if (RT_FAILURE(rc))
2264	off = rc;
2265	return off;
2266	}
2267
2268
2269	RTDECL(int) RTVfsIoStrmSkip(RTVFSIOSTREAM hVfsIos, RTFOFF cb)
2270	{
2271	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2272	AssertPtrReturn(pThis, -1);
2273	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, -1);
2274	AssertReturn(cb >= 0, VERR_INVALID_PARAMETER);
2275
2276	int rc;
2277	if (pThis->pOps->pfnSkip)
2278	{
2279	RTVfsLockAcquireWrite(pThis->Base.hLock);
2280	rc = pThis->pOps->pfnSkip(pThis->Base.pvThis, cb);
2281	RTVfsLockReleaseWrite(pThis->Base.hLock);
2282	}
2283	else if (pThis->pOps->Obj.enmType == RTVFSOBJTYPE_FILE)
2284	{
2285	RTVFSFILEINTERNAL *pThisFile = RT_FROM_MEMBER(pThis, RTVFSFILEINTERNAL, Stream);
2286	RTFOFF offIgnored;
2287
2288	RTVfsLockAcquireWrite(pThis->Base.hLock);
2289	rc = pThisFile->pOps->pfnSeek(pThis->Base.pvThis, cb, RTFILE_SEEK_CURRENT, &offIgnored);
2290	RTVfsLockReleaseWrite(pThis->Base.hLock);
2291	}
2292	else
2293	{
2294	void *pvBuf = RTMemTmpAlloc(_64K);
2295	if (pvBuf)
2296	{
2297	rc = VINF_SUCCESS;
2298	while (cb > 0)
2299	{
2300	size_t cbToRead = (size_t)RT_MIN(cb, _64K);
2301	RTVfsLockAcquireWrite(pThis->Base.hLock);
2302	rc = RTVfsIoStrmRead(hVfsIos, pvBuf, cbToRead, true /fBlocking/, NULL);
2303	RTVfsLockReleaseWrite(pThis->Base.hLock);
2304	if (RT_FAILURE(rc))
2305	break;
2306	cb -= cbToRead;
2307	}
2308
2309	RTMemTmpFree(pvBuf);
2310	}
2311	else
2312	rc = VERR_NO_TMP_MEMORY;
2313	}
2314	return rc;
2315	}
2316
2317
2318	RTDECL(int) RTVfsIoStrmZeroFill(RTVFSIOSTREAM hVfsIos, RTFOFF cb)
2319	{
2320	RTVFSIOSTREAMINTERNAL *pThis = hVfsIos;
2321	AssertPtrReturn(pThis, -1);
2322	AssertReturn(pThis->uMagic == RTVFSIOSTREAM_MAGIC, -1);
2323
2324	int rc;
2325	if (pThis->pOps->pfnSkip)
2326	{
2327	RTVfsLockAcquireWrite(pThis->Base.hLock);
2328	rc = pThis->pOps->pfnZeroFill(pThis->Base.pvThis, cb);
2329	RTVfsLockReleaseWrite(pThis->Base.hLock);
2330	}
2331	else
2332	{
2333	void *pvBuf = RTMemTmpAllocZ(_64K);
2334	if (pvBuf)
2335	{
2336	rc = VINF_SUCCESS;
2337	while (cb > 0)
2338	{
2339	size_t cbToWrite = (size_t)RT_MIN(cb, _64K);
2340	RTVfsLockAcquireWrite(pThis->Base.hLock);
2341	rc = RTVfsIoStrmWrite(hVfsIos, pvBuf, cbToWrite, true /fBlocking/, NULL);
2342	RTVfsLockReleaseWrite(pThis->Base.hLock);
2343	if (RT_FAILURE(rc))
2344	break;
2345	cb -= cbToWrite;
2346	}
2347
2348	RTMemTmpFree(pvBuf);
2349	}
2350	else
2351	rc = VERR_NO_TMP_MEMORY;
2352	}
2353	return rc;
2354	}
2355
2356
2357	RTDECL(bool) RTVfsIoStrmIsAtEnd(RTVFSIOSTREAM hVfsIos)
2358	{
2359	/*
2360	* There is where the zero read behavior comes in handy.
2361	*/
2362	char bDummy;
2363	size_t cbRead;
2364	int rc = RTVfsIoStrmRead(hVfsIos, &bDummy, 0 /cbToRead/, false /fBlocking/, &cbRead);
2365	return rc == VINF_EOF;
2366	}
2367
2368
2369
2370
2371
2372
2373	/*
2374	*
2375	* F I L E F I L E F I L E
2376	* F I L E F I L E F I L E
2377	* F I L E F I L E F I L E
2378	*
2379	*/
2380
2381	RTDECL(int) RTVfsNewFile(PCRTVFSFILEOPS pFileOps, size_t cbInstance, uint32_t fOpen, RTVFS hVfs, RTVFSLOCK hLock,
2382	PRTVFSFILE phVfsFile, void **ppvInstance)
2383	{
2384	/*
2385	* Validate the input, be extra strict in strict builds.
2386	*/
2387	AssertPtr(pFileOps);
2388	AssertReturn(pFileOps->uVersion == RTVFSFILEOPS_VERSION, VERR_VERSION_MISMATCH);
2389	AssertReturn(pFileOps->uEndMarker == RTVFSFILEOPS_VERSION, VERR_VERSION_MISMATCH);
2390	Assert(!pFileOps->fReserved);
2391	RTVFSIOSTREAM_ASSERT_OPS(&pFileOps->Stream, RTVFSOBJTYPE_FILE);
2392	Assert(cbInstance > 0);
2393	Assert(fOpen & RTFILE_O_ACCESS_MASK);
2394	AssertPtr(ppvInstance);
2395	AssertPtr(phVfsFile);
2396	RTVFS_ASSERT_VALID_HANDLE_OR_NIL_RETURN(hVfs, VERR_INVALID_HANDLE);
2397
2398	/*
2399	* Allocate the handle + instance data.
2400	*/
2401	size_t const cbThis = RT_ALIGN_Z(sizeof(RTVFSFILEINTERNAL), RTVFS_INST_ALIGNMENT)
2402	+ RT_ALIGN_Z(cbInstance, RTVFS_INST_ALIGNMENT);
2403	RTVFSFILEINTERNAL pThis = (RTVFSFILEINTERNAL )RTMemAllocZ(cbThis);
2404	if (!pThis)
2405	return VERR_NO_MEMORY;
2406
2407	int rc = rtVfsObjInitNewObject(&pThis->Stream.Base, &pFileOps->Stream.Obj, hVfs, hLock,
2408	(char )pThis + RT_ALIGN_Z(sizeof(pThis), RTVFS_INST_ALIGNMENT));
2409	if (RT_FAILURE(rc))
2410	{
2411	RTMemFree(pThis);
2412	return rc;
2413	}
2414
2415	pThis->uMagic = RTVFSFILE_MAGIC;
2416	pThis->fReserved = 0;
2417	pThis->pOps = pFileOps;
2418	pThis->Stream.uMagic = RTVFSIOSTREAM_MAGIC;
2419	pThis->Stream.fFlags = fOpen;
2420	pThis->Stream.pOps = &pFileOps->Stream;
2421
2422	*phVfsFile = pThis;
2423	*ppvInstance = pThis->Stream.Base.pvThis;
2424	return VINF_SUCCESS;
2425	}
2426
2427
2428	RTDECL(int) RTVfsFileOpen(RTVFS hVfs, const char *pszFilename, uint64_t fOpen, PRTVFSFILE phVfsFile)
2429	{
2430	/*
2431	* Validate input.
2432	*/
2433	RTVFSINTERNAL *pThis = hVfs;
2434	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2435	AssertReturn(pThis->uMagic == RTVFS_MAGIC, VERR_INVALID_HANDLE);
2436	AssertPtrReturn(pszFilename, VERR_INVALID_POINTER);
2437	AssertPtrReturn(phVfsFile, VERR_INVALID_POINTER);
2438
2439	int rc = rtFileRecalcAndValidateFlags(&fOpen);
2440	if (RT_FAILURE(rc))
2441	return rc;
2442
2443	/*
2444	* Parse the path, assume current directory is root since we've got no
2445	* caller context here.
2446	*/
2447	PRTVFSPARSEDPATH pPath;
2448	rc = RTVfsParsePathA(pszFilename, "/", &pPath);
2449	if (RT_SUCCESS(rc))
2450	{
2451	if (!pPath->fDirSlash)
2452	{
2453	/*
2454	* Tranverse the path, resolving the parent node and any symlinks
2455	* in the final element, and ask the directory to open the file.
2456	*/
2457	RTVFSDIRINTERNAL *pVfsParentDir;
2458	rc = rtVfsTraverseToParent(pThis, pPath, true /fFollowSymlink/, &pVfsParentDir);
2459	if (RT_SUCCESS(rc))
2460	{
2461	const char *pszEntryName = &pPath->szPath[pPath->aoffComponents[pPath->cComponents - 1]];
2462
2463	/** @todo there is a symlink creation race here. */
2464	RTVfsLockAcquireWrite(pVfsParentDir->Base.hLock);
2465	rc = pVfsParentDir->pOps->pfnOpenFile(pVfsParentDir->Base.pvThis, pszEntryName, fOpen, phVfsFile);
2466	RTVfsLockReleaseWrite(pVfsParentDir->Base.hLock);
2467
2468	RTVfsDirRelease(pVfsParentDir);
2469
2470	if (RT_SUCCESS(rc))
2471	{
2472	AssertPtr(*phVfsFile);
2473	Assert((*phVfsFile)->uMagic == RTVFSFILE_MAGIC);
2474	}
2475	}
2476	}
2477	else
2478	rc = VERR_INVALID_PARAMETER;
2479	RTVfsParsePathFree(pPath);
2480	}
2481	return rc;
2482	}
2483
2484
2485	RTDECL(uint32_t) RTVfsFileRetain(RTVFSFILE hVfsFile)
2486	{
2487	RTVFSFILEINTERNAL *pThis = hVfsFile;
2488	AssertPtrReturn(pThis, UINT32_MAX);
2489	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, UINT32_MAX);
2490	return rtVfsObjRetain(&pThis->Stream.Base);
2491	}
2492
2493
2494	RTDECL(uint32_t) RTVfsFileRelease(RTVFSFILE hVfsFile)
2495	{
2496	RTVFSFILEINTERNAL *pThis = hVfsFile;
2497	if (pThis == NIL_RTVFSFILE)
2498	return 0;
2499	AssertPtrReturn(pThis, UINT32_MAX);
2500	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, UINT32_MAX);
2501	return rtVfsObjRelease(&pThis->Stream.Base);
2502	}
2503
2504
2505	RTDECL(RTVFSIOSTREAM) RTVfsFileToIoStream(RTVFSFILE hVfsFile)
2506	{
2507	RTVFSFILEINTERNAL *pThis = hVfsFile;
2508	AssertPtrReturn(pThis, NIL_RTVFSIOSTREAM);
2509	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, NIL_RTVFSIOSTREAM);
2510
2511	rtVfsObjRetainVoid(&pThis->Stream.Base);
2512	return &pThis->Stream;
2513	}
2514
2515
2516	RTDECL(int) RTVfsFileQueryInfo(RTVFSFILE hVfsFile, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
2517	{
2518	RTVFSFILEINTERNAL *pThis = hVfsFile;
2519	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2520	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2521	return RTVfsObjQueryInfo(&pThis->Stream.Base, pObjInfo, enmAddAttr);
2522	}
2523
2524
2525	RTDECL(int) RTVfsFileRead(RTVFSFILE hVfsFile, void pvBuf, size_t cbToRead, size_t pcbRead)
2526	{
2527	AssertPtrNullReturn(pcbRead, VERR_INVALID_POINTER);
2528	if (pcbRead)
2529	*pcbRead = 0;
2530	RTVFSFILEINTERNAL *pThis = hVfsFile;
2531	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2532	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2533	return RTVfsIoStrmRead(&pThis->Stream, pvBuf, cbToRead, true /fBlocking/, pcbRead);
2534	}
2535
2536
2537	RTDECL(int) RTVfsFileWrite(RTVFSFILE hVfsFile, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
2538	{
2539	AssertPtrNullReturn(pcbWritten, VERR_INVALID_POINTER);
2540	if (pcbWritten)
2541	*pcbWritten = 0;
2542	RTVFSFILEINTERNAL *pThis = hVfsFile;
2543	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2544	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2545	return RTVfsIoStrmWrite(&pThis->Stream, pvBuf, cbToWrite, true /fBlocking/, pcbWritten);
2546	}
2547
2548
2549	RTDECL(int) RTVfsFileWriteAt(RTVFSFILE hVfsFile, RTFOFF off, const void pvBuf, size_t cbToWrite, size_t pcbWritten)
2550	{
2551	AssertPtrNullReturn(pcbWritten, VERR_INVALID_POINTER);
2552	if (pcbWritten)
2553	*pcbWritten = 0;
2554	RTVFSFILEINTERNAL *pThis = hVfsFile;
2555	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2556	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2557
2558	int rc = RTVfsFileSeek(hVfsFile, off, RTFILE_SEEK_BEGIN, NULL);
2559	if (RT_SUCCESS(rc))
2560	rc = RTVfsIoStrmWriteAt(&pThis->Stream, off, pvBuf, cbToWrite, true /fBlocking/, pcbWritten);
2561
2562	return rc;
2563	}
2564
2565
2566	RTDECL(int) RTVfsFileReadAt(RTVFSFILE hVfsFile, RTFOFF off, void pvBuf, size_t cbToRead, size_t pcbRead)
2567	{
2568	AssertPtrNullReturn(pcbRead, VERR_INVALID_POINTER);
2569	if (pcbRead)
2570	*pcbRead = 0;
2571	RTVFSFILEINTERNAL *pThis = hVfsFile;
2572	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2573	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2574
2575	int rc = RTVfsFileSeek(hVfsFile, off, RTFILE_SEEK_BEGIN, NULL);
2576	if (RT_SUCCESS(rc))
2577	rc = RTVfsIoStrmReadAt(&pThis->Stream, off, pvBuf, cbToRead, true /fBlocking/, pcbRead);
2578
2579	return rc;
2580	}
2581
2582
2583	RTDECL(int) RTVfsFileFlush(RTVFSFILE hVfsFile)
2584	{
2585	RTVFSFILEINTERNAL *pThis = hVfsFile;
2586	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2587	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2588	return RTVfsIoStrmFlush(&pThis->Stream);
2589	}
2590
2591
2592	RTDECL(RTFOFF) RTVfsFilePoll(RTVFSFILE hVfsFile, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr,
2593	uint32_t *pfRetEvents)
2594	{
2595	RTVFSFILEINTERNAL *pThis = hVfsFile;
2596	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2597	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2598	return RTVfsIoStrmPoll(&pThis->Stream, fEvents, cMillies, fIntr, pfRetEvents);
2599	}
2600
2601
2602	RTDECL(RTFOFF) RTVfsFileTell(RTVFSFILE hVfsFile)
2603	{
2604	RTVFSFILEINTERNAL *pThis = hVfsFile;
2605	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2606	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2607	return RTVfsIoStrmTell(&pThis->Stream);
2608	}
2609
2610
2611	RTDECL(int) RTVfsFileSeek(RTVFSFILE hVfsFile, RTFOFF offSeek, uint32_t uMethod, uint64_t *poffActual)
2612	{
2613	RTVFSFILEINTERNAL *pThis = hVfsFile;
2614	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2615	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2616
2617	AssertReturn( uMethod == RTFILE_SEEK_BEGIN
2618	\|\| uMethod == RTFILE_SEEK_CURRENT
2619	\|\| uMethod == RTFILE_SEEK_END, VERR_INVALID_PARAMETER);
2620	AssertPtrNullReturn(poffActual, VERR_INVALID_POINTER);
2621
2622	RTFOFF offActual = 0;
2623	RTVfsLockAcquireWrite(pThis->Stream.Base.hLock);
2624	int rc = pThis->pOps->pfnSeek(pThis->Stream.Base.pvThis, offSeek, uMethod, &offActual);
2625	RTVfsLockReleaseWrite(pThis->Stream.Base.hLock);
2626	if (RT_SUCCESS(rc) && poffActual)
2627	{
2628	Assert(offActual >= 0);
2629	*poffActual = offActual;
2630	}
2631
2632	return rc;
2633	}
2634
2635
2636	RTDECL(int) RTVfsFileGetSize(RTVFSFILE hVfsFile, uint64_t *pcbSize)
2637	{
2638	RTVFSFILEINTERNAL *pThis = hVfsFile;
2639	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
2640	AssertReturn(pThis->uMagic == RTVFSFILE_MAGIC, VERR_INVALID_HANDLE);
2641	AssertPtrReturn(pcbSize, VERR_INVALID_POINTER);
2642
2643	RTVfsLockAcquireWrite(pThis->Stream.Base.hLock);
2644	int rc = pThis->pOps->pfnQuerySize(pThis->Stream.Base.pvThis, pcbSize);
2645	RTVfsLockReleaseWrite(pThis->Stream.Base.hLock);
2646
2647	return rc;
2648	}

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source: vbox/trunk/src/VBox/Runtime/common/vfs/vfsbase.cpp@ 45234

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