PDMAsyncCompletionFileInternal.h@ 29450

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1	/* $Id: PDMAsyncCompletionFileInternal.h 29323 2010-05-11 10:04:23Z vboxsync $ */
2	/** @file
3	* PDM Async I/O - Transport data asynchronous in R3 using EMT.
4	*/
5
6	/*
7	* Copyright (C) 2006-2008 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
18	#ifndef ___PDMAsyncCompletionFileInternal_h
19	#define ___PDMAsyncCompletionFileInternal_h
20
21	#include <VBox/cfgm.h>
22	#include <VBox/stam.h>
23	#include <VBox/tm.h>
24	#include <iprt/types.h>
25	#include <iprt/file.h>
26	#include <iprt/thread.h>
27	#include <iprt/semaphore.h>
28	#include <iprt/critsect.h>
29	#include <iprt/avl.h>
30	#include <iprt/list.h>
31	#include <iprt/spinlock.h>
32	#include <iprt/memcache.h>
33
34	#include "PDMAsyncCompletionInternal.h"
35
36	/** @todo: Revise the caching of tasks. We have currently four caches:
37	* Per endpoint task cache
38	* Per class cache
39	* Per endpoint task segment cache
40	* Per class task segment cache
41	*
42	* We could use the RT heap for this probably or extend MMR3Heap (uses RTMemAlloc
43	* instead of managing larger blocks) to have this global for the whole VM.
44	*/
45
46	RT_C_DECLS_BEGIN
47
48	/**
49	* A few forward declerations.
50	*/
51	typedef struct PDMASYNCCOMPLETIONENDPOINTFILE *PPDMASYNCCOMPLETIONENDPOINTFILE;
52	/** Pointer to a request segment. */
53	typedef struct PDMACTASKFILE *PPDMACTASKFILE;
54	/** Pointer to the endpoint class data. */
55	typedef struct PDMASYNCCOMPLETIONTASKFILE *PPDMASYNCCOMPLETIONTASKFILE;
56	/** Pointer to a cache LRU list. */
57	typedef struct PDMACFILELRULIST *PPDMACFILELRULIST;
58	/** Pointer to the global cache structure. */
59	typedef struct PDMACFILECACHEGLOBAL *PPDMACFILECACHEGLOBAL;
60	/** Pointer to a task segment. */
61	typedef struct PDMACFILETASKSEG *PPDMACFILETASKSEG;
62
63	/**
64	* Blocking event types.
65	*/
66	typedef enum PDMACEPFILEAIOMGRBLOCKINGEVENT
67	{
68	/** Invalid tye */
69	PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID = 0,
70	/** An endpoint is added to the manager. */
71	PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT,
72	/** An endpoint is removed from the manager. */
73	PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT,
74	/** An endpoint is about to be closed. */
75	PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT,
76	/** The manager is requested to terminate */
77	PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN,
78	/** The manager is requested to suspend */
79	PDMACEPFILEAIOMGRBLOCKINGEVENT_SUSPEND,
80	/** The manager is requested to resume */
81	PDMACEPFILEAIOMGRBLOCKINGEVENT_RESUME,
82	/** 32bit hack */
83	PDMACEPFILEAIOMGRBLOCKINGEVENT_32BIT_HACK = 0x7fffffff
84	} PDMACEPFILEAIOMGRBLOCKINGEVENT;
85
86	/**
87	* I/O manager type.
88	*/
89	typedef enum PDMACEPFILEMGRTYPE
90	{
91	/** Simple aka failsafe */
92	PDMACEPFILEMGRTYPE_SIMPLE = 0,
93	/** Async I/O with host cache enabled. */
94	PDMACEPFILEMGRTYPE_ASYNC,
95	/** 32bit hack */
96	PDMACEPFILEMGRTYPE_32BIT_HACK = 0x7fffffff
97	} PDMACEPFILEMGRTYPE;
98	/** Pointer to a I/O manager type */
99	typedef PDMACEPFILEMGRTYPE *PPDMACEPFILEMGRTYPE;
100
101	/**
102	* States of the I/O manager.
103	*/
104	typedef enum PDMACEPFILEMGRSTATE
105	{
106	/** Invalid state. */
107	PDMACEPFILEMGRSTATE_INVALID = 0,
108	/** Normal running state accepting new requests
109	* and processing them.
110	*/
111	PDMACEPFILEMGRSTATE_RUNNING,
112	/** Fault state - not accepting new tasks for endpoints but waiting for
113	* remaining ones to finish.
114	*/
115	PDMACEPFILEMGRSTATE_FAULT,
116	/** Suspending state - not accepting new tasks for endpoints but waiting
117	* for remaining ones to finish.
118	*/
119	PDMACEPFILEMGRSTATE_SUSPENDING,
120	/** Shutdown state - not accepting new tasks for endpoints but waiting
121	* for remaining ones to finish.
122	*/
123	PDMACEPFILEMGRSTATE_SHUTDOWN,
124	/** The I/O manager waits for all active requests to complete and doesn't queue
125	* new ones because it needs to grow to handle more requests.
126	*/
127	PDMACEPFILEMGRSTATE_GROWING,
128	/** 32bit hack */
129	PDMACEPFILEMGRSTATE_32BIT_HACK = 0x7fffffff
130	} PDMACEPFILEMGRSTATE;
131
132	/**
133	* State of a async I/O manager.
134	*/
135	typedef struct PDMACEPFILEMGR
136	{
137	/** Next Aio manager in the list. */
138	R3PTRTYPE(struct PDMACEPFILEMGR *) pNext;
139	/** Previous Aio manager in the list. */
140	R3PTRTYPE(struct PDMACEPFILEMGR *) pPrev;
141	/** Manager type */
142	PDMACEPFILEMGRTYPE enmMgrType;
143	/** Current state of the manager. */
144	PDMACEPFILEMGRSTATE enmState;
145	/** Event semaphore the manager sleeps on when waiting for new requests. */
146	RTSEMEVENT EventSem;
147	/** Flag whether the thread waits in the event semaphore. */
148	volatile bool fWaitingEventSem;
149	/** Thread data */
150	RTTHREAD Thread;
151	/** The async I/O context for this manager. */
152	RTFILEAIOCTX hAioCtx;
153	/** Flag whether the I/O manager was woken up. */
154	volatile bool fWokenUp;
155	/** List of endpoints assigned to this manager. */
156	R3PTRTYPE(PPDMASYNCCOMPLETIONENDPOINTFILE) pEndpointsHead;
157	/** Number of endpoints assigned to the manager. */
158	unsigned cEndpoints;
159	/** Number of requests active currently. */
160	unsigned cRequestsActive;
161	/** Number of maximum requests active. */
162	uint32_t cRequestsActiveMax;
163	/** Pointer to an array of free async I/O request handles. */
164	RTFILEAIOREQ *pahReqsFree;
165	/** Index of the next free entry in the cache. */
166	uint32_t iFreeEntry;
167	/** Size of the array. */
168	unsigned cReqEntries;
169	/** Flag whether at least one endpoint reached its bandwidth limit. */
170	bool fBwLimitReached;
171	/** Memory cache for file range locks. */
172	RTMEMCACHE hMemCacheRangeLocks;
173	/** Critical section protecting the blocking event handling. */
174	RTCRITSECT CritSectBlockingEvent;
175	/** Event sempahore for blocking external events.
176	* The caller waits on it until the async I/O manager
177	* finished processing the event. */
178	RTSEMEVENT EventSemBlock;
179	/** Flag whether a blocking event is pending and needs
180	* processing by the I/O manager. */
181	volatile bool fBlockingEventPending;
182	/** Blocking event type */
183	volatile PDMACEPFILEAIOMGRBLOCKINGEVENT enmBlockingEvent;
184	/** Event type data */
185	union
186	{
187	/** Add endpoint event. */
188	struct
189	{
190	/** The endpoint to be added */
191	volatile PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
192	} AddEndpoint;
193	/** Remove endpoint event. */
194	struct
195	{
196	/** The endpoint to be removed */
197	volatile PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
198	} RemoveEndpoint;
199	/** Close endpoint event. */
200	struct
201	{
202	/** The endpoint to be closed */
203	volatile PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
204	} CloseEndpoint;
205	} BlockingEventData;
206	} PDMACEPFILEMGR;
207	/** Pointer to a async I/O manager state. */
208	typedef PDMACEPFILEMGR *PPDMACEPFILEMGR;
209	/** Pointer to a async I/O manager state pointer. */
210	typedef PPDMACEPFILEMGR *PPPDMACEPFILEMGR;
211
212	/**
213	* Bandwidth control manager instance data
214	*/
215	typedef struct PDMACFILEBWMGR
216	{
217	/** Maximum number of bytes the VM is allowed to transfer (Max is 4GB/s) */
218	uint32_t cbVMTransferPerSecMax;
219	/** Number of bytes we start with */
220	uint32_t cbVMTransferPerSecStart;
221	/** Step after each update */
222	uint32_t cbVMTransferPerSecStep;
223	/** Number of bytes we are allowed to transfer till the next update.
224	* Resetted by the refresh timer. */
225	volatile uint32_t cbVMTransferAllowed;
226	/** Timestamp of the last update */
227	volatile uint64_t tsUpdatedLast;
228	/** Reference counter - How many endpoints are associated with this manager. */
229	uint32_t cRefs;
230	} PDMACFILEBWMGR;
231	/** Pointer to a bandwidth control manager */
232	typedef PDMACFILEBWMGR *PPDMACFILEBWMGR;
233	/** Pointer to a bandwidth control manager pointer */
234	typedef PPDMACFILEBWMGR *PPPDMACFILEBWMGR;
235
236	/**
237	* A file access range lock.
238	*/
239	typedef struct PDMACFILERANGELOCK
240	{
241	/** AVL node in the locked range tree of the endpoint. */
242	AVLRFOFFNODECORE Core;
243	/** How many tasks have locked this range. */
244	uint32_t cRefs;
245	/** Flag whether this is a read or write lock. */
246	bool fReadLock;
247	/** List of tasks which are waiting that the range gets unlocked. */
248	PPDMACTASKFILE pWaitingTasksHead;
249	/** List of tasks which are waiting that the range gets unlocked. */
250	PPDMACTASKFILE pWaitingTasksTail;
251	} PDMACFILERANGELOCK, *PPDMACFILERANGELOCK;
252
253	/**
254	* Data for one request segment waiting for cache entry.
255	*/
256	typedef struct PDMACFILETASKSEG
257	{
258	/** Next task segment in the list. */
259	struct PDMACFILETASKSEG *pNext;
260	/** Task this segment is for. */
261	PPDMASYNCCOMPLETIONTASKFILE pTask;
262	/** Offset into the cache entry buffer to start reading from. */
263	uint32_t uBufOffset;
264	/** Number of bytes to transfer. */
265	size_t cbTransfer;
266	/** Pointer to the buffer. */
267	void *pvBuf;
268	/** Flag whether this entry writes data to the cache. */
269	bool fWrite;
270	} PDMACFILETASKSEG;
271
272	/**
273	* A cache entry
274	*/
275	typedef struct PDMACFILECACHEENTRY
276	{
277	/** The AVL entry data. */
278	AVLRFOFFNODECORE Core;
279	/** Pointer to the previous element. Used in one of the LRU lists.*/
280	struct PDMACFILECACHEENTRY *pPrev;
281	/** Pointer to the next element. Used in one of the LRU lists.*/
282	struct PDMACFILECACHEENTRY *pNext;
283	/** Pointer to the list the entry is in. */
284	PPDMACFILELRULIST pList;
285	/** Pointer to the global cache structure. */
286	PPDMACFILECACHEGLOBAL pCache;
287	/** Endpoint the entry belongs to. */
288	PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
289	/** Flags for this entry. Combinations of PDMACFILECACHE_* #defines */
290	volatile uint32_t fFlags;
291	/** Reference counter. Prevents eviction of the entry if > 0. */
292	volatile uint32_t cRefs;
293	/** Size of the entry. */
294	size_t cbData;
295	/** Pointer to the memory containing the data. */
296	uint8_t *pbData;
297	/** Head of list of tasks waiting for this one to finish. */
298	PPDMACFILETASKSEG pWaitingHead;
299	/** Tail of list of tasks waiting for this one to finish. */
300	PPDMACFILETASKSEG pWaitingTail;
301	/** Node for dirty but not yet committed entries list per endpoint. */
302	RTLISTNODE NodeNotCommitted;
303	} PDMACFILECACHEENTRY, *PPDMACFILECACHEENTRY;
304	/** I/O is still in progress for this entry. This entry is not evictable. */
305	#define PDMACFILECACHE_ENTRY_IO_IN_PROGRESS RT_BIT(0)
306	/** Entry is locked and thus not evictable. */
307	#define PDMACFILECACHE_ENTRY_LOCKED RT_BIT(1)
308	/** Entry is dirty */
309	#define PDMACFILECACHE_ENTRY_IS_DIRTY RT_BIT(2)
310	/** Entry is not evictable. */
311	#define PDMACFILECACHE_NOT_EVICTABLE (PDMACFILECACHE_ENTRY_LOCKED \| PDMACFILECACHE_ENTRY_IO_IN_PROGRESS \| PDMACFILECACHE_ENTRY_IS_DIRTY)
312
313	/**
314	* LRU list data
315	*/
316	typedef struct PDMACFILELRULIST
317	{
318	/** Head of the list. */
319	PPDMACFILECACHEENTRY pHead;
320	/** Tail of the list. */
321	PPDMACFILECACHEENTRY pTail;
322	/** Number of bytes cached in the list. */
323	uint32_t cbCached;
324	} PDMACFILELRULIST;
325
326	/**
327	* Global cache data.
328	*/
329	typedef struct PDMACFILECACHEGLOBAL
330	{
331	/** Maximum size of the cache in bytes. */
332	uint32_t cbMax;
333	/** Current size of the cache in bytes. */
334	uint32_t cbCached;
335	/** Critical section protecting the cache. */
336	RTCRITSECT CritSect;
337	/** Maximum number of bytes cached. */
338	uint32_t cbRecentlyUsedInMax;
339	/** Maximum number of bytes in the paged out list .*/
340	uint32_t cbRecentlyUsedOutMax;
341	/** Recently used cache entries list */
342	PDMACFILELRULIST LruRecentlyUsedIn;
343	/** Scorecard cache entry list. */
344	PDMACFILELRULIST LruRecentlyUsedOut;
345	/** List of frequently used cache entries */
346	PDMACFILELRULIST LruFrequentlyUsed;
347	/** Commit timeout in milli seconds */
348	uint32_t u32CommitTimeoutMs;
349	/** Number of dirty bytes needed to start a commit of the data to the disk. */
350	uint32_t cbCommitDirtyThreshold;
351	/** Current number of dirty bytes in the cache. */
352	volatile uint32_t cbDirty;
353	/** Flag whether a commit is currently in progress. */
354	volatile bool fCommitInProgress;
355	/** Commit interval timer */
356	PTMTIMERR3 pTimerCommit;
357	/** Number of endpoints using the cache. */
358	uint32_t cRefs;
359	/** List of all endpoints using this cache. */
360	RTLISTNODE ListEndpoints;
361	#ifdef VBOX_WITH_STATISTICS
362	/** Alignment */
363	uint32_t u32Alignment;
364	/** Hit counter. */
365	STAMCOUNTER cHits;
366	/** Partial hit counter. */
367	STAMCOUNTER cPartialHits;
368	/** Miss counter. */
369	STAMCOUNTER cMisses;
370	/** Bytes read from cache. */
371	STAMCOUNTER StatRead;
372	/** Bytes written to the cache. */
373	STAMCOUNTER StatWritten;
374	/** Time spend to get an entry in the AVL tree. */
375	STAMPROFILEADV StatTreeGet;
376	/** Time spend to insert an entry in the AVL tree. */
377	STAMPROFILEADV StatTreeInsert;
378	/** Time spend to remove an entry in the AVL tree. */
379	STAMPROFILEADV StatTreeRemove;
380	/** Number of times a buffer could be reused. */
381	STAMCOUNTER StatBuffersReused;
382	#endif
383	} PDMACFILECACHEGLOBAL;
384	#ifdef VBOX_WITH_STATISTICS
385	AssertCompileMemberAlignment(PDMACFILECACHEGLOBAL, cHits, sizeof(uint64_t));
386	#endif
387
388	/**
389	* Per endpoint cache data.
390	*/
391	typedef struct PDMACFILEENDPOINTCACHE
392	{
393	/** AVL tree managing cache entries. */
394	PAVLRFOFFTREE pTree;
395	/** R/W semaphore protecting cached entries for this endpoint. */
396	RTSEMRW SemRWEntries;
397	/** Pointer to the gobal cache data */
398	PPDMACFILECACHEGLOBAL pCache;
399	/** Lock protecting the dirty entries list. */
400	RTSPINLOCK LockList;
401	/** List of dirty but not committed entries for this endpoint. */
402	RTLISTNODE ListDirtyNotCommitted;
403	/** Node of the cache endpoint list. */
404	RTLISTNODE NodeCacheEndpoint;
405	#ifdef VBOX_WITH_STATISTICS
406	/** Number of times a write was deferred because the cache entry was still in progress */
407	STAMCOUNTER StatWriteDeferred;
408	#endif
409	} PDMACFILEENDPOINTCACHE, *PPDMACFILEENDPOINTCACHE;
410	#ifdef VBOX_WITH_STATISTICS
411	AssertCompileMemberAlignment(PDMACFILEENDPOINTCACHE, StatWriteDeferred, sizeof(uint64_t));
412	#endif
413
414	/**
415	* Backend type for the endpoint.
416	*/
417	typedef enum PDMACFILEEPBACKEND
418	{
419	/** Non buffered. */
420	PDMACFILEEPBACKEND_NON_BUFFERED = 0,
421	/** Buffered (i.e host cache enabled) */
422	PDMACFILEEPBACKEND_BUFFERED,
423	/** 32bit hack */
424	PDMACFILEEPBACKEND_32BIT_HACK = 0x7fffffff
425	} PDMACFILEEPBACKEND;
426	/** Pointer to a backend type. */
427	typedef PDMACFILEEPBACKEND *PPDMACFILEEPBACKEND;
428
429	/**
430	* Global data for the file endpoint class.
431	*/
432	typedef struct PDMASYNCCOMPLETIONEPCLASSFILE
433	{
434	/** Common data. */
435	PDMASYNCCOMPLETIONEPCLASS Core;
436	/** Override I/O manager type - set to SIMPLE after failure. */
437	PDMACEPFILEMGRTYPE enmMgrTypeOverride;
438	/** Default backend type for the endpoint. */
439	PDMACFILEEPBACKEND enmEpBackendDefault;
440	/** Flag whether the file data cache is enabled. */
441	bool fCacheEnabled;
442	/** Critical section protecting the list of async I/O managers. */
443	RTCRITSECT CritSect;
444	/** Pointer to the head of the async I/O managers. */
445	R3PTRTYPE(PPDMACEPFILEMGR) pAioMgrHead;
446	/** Number of async I/O managers currently running. */
447	unsigned cAioMgrs;
448	/** Maximum number of segments to cache per endpoint */
449	unsigned cTasksCacheMax;
450	/** Maximum number of simultaneous outstandingrequests. */
451	uint32_t cReqsOutstandingMax;
452	/** Bitmask for checking the alignment of a buffer. */
453	RTR3UINTPTR uBitmaskAlignment;
454	#ifdef VBOX_WITH_STATISTICS
455	uint32_t u32Alignment;
456	#endif
457	/** Global cache data. */
458	PDMACFILECACHEGLOBAL Cache;
459	/** Flag whether the out of resources warning was printed already. */
460	bool fOutOfResourcesWarningPrinted;
461	/** The global bandwidth control manager */
462	PPDMACFILEBWMGR pBwMgr;
463	} PDMASYNCCOMPLETIONEPCLASSFILE;
464	/** Pointer to the endpoint class data. */
465	typedef PDMASYNCCOMPLETIONEPCLASSFILE *PPDMASYNCCOMPLETIONEPCLASSFILE;
466	#ifdef VBOX_WITH_STATISTICS
467	AssertCompileMemberAlignment(PDMASYNCCOMPLETIONEPCLASSFILE, Cache, sizeof(uint64_t));
468	#endif
469
470	typedef enum PDMACEPFILEBLOCKINGEVENT
471	{
472	/** The invalid event type */
473	PDMACEPFILEBLOCKINGEVENT_INVALID = 0,
474	/** A task is about to be canceled */
475	PDMACEPFILEBLOCKINGEVENT_CANCEL,
476	/** Usual 32bit hack */
477	PDMACEPFILEBLOCKINGEVENT_32BIT_HACK = 0x7fffffff
478	} PDMACEPFILEBLOCKINGEVENT;
479
480	/**
481	* States of the endpoint.
482	*/
483	typedef enum PDMASYNCCOMPLETIONENDPOINTFILESTATE
484	{
485	/** Invalid state. */
486	PDMASYNCCOMPLETIONENDPOINTFILESTATE_INVALID = 0,
487	/** Normal running state accepting new requests
488	* and processing them.
489	*/
490	PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE,
491	/** The endpoint is about to be closed - not accepting new tasks for endpoints but waiting for
492	* remaining ones to finish.
493	*/
494	PDMASYNCCOMPLETIONENDPOINTFILESTATE_CLOSING,
495	/** Removing from current I/O manager state - not processing new tasks for endpoints but waiting
496	* for remaining ones to finish.
497	*/
498	PDMASYNCCOMPLETIONENDPOINTFILESTATE_REMOVING,
499	/** The current endpoint will be migrated to another I/O manager. */
500	PDMASYNCCOMPLETIONENDPOINTFILESTATE_MIGRATING,
501	/** 32bit hack */
502	PDMASYNCCOMPLETIONENDPOINTFILESTATE_32BIT_HACK = 0x7fffffff
503	} PDMASYNCCOMPLETIONENDPOINTFILESTATE;
504
505	/**
506	* Data for the file endpoint.
507	*/
508	typedef struct PDMASYNCCOMPLETIONENDPOINTFILE
509	{
510	/** Common data. */
511	PDMASYNCCOMPLETIONENDPOINT Core;
512	/** Current state of the endpoint. */
513	PDMASYNCCOMPLETIONENDPOINTFILESTATE enmState;
514	/** The backend to use for this endpoint. */
515	PDMACFILEEPBACKEND enmBackendType;
516	/** async I/O manager this endpoint is assigned to. */
517	R3PTRTYPE(volatile PPDMACEPFILEMGR) pAioMgr;
518	/** Flags for opening the file. */
519	unsigned fFlags;
520	/** File handle. */
521	RTFILE File;
522	/** Size of the endpoint.
523	* Updated while data is appended even if it is
524	* only in the cache yet and not written to the file.
525	*/
526	volatile uint64_t cbEndpoint;
527	/**
528	* Real size of the file. Only updated if
529	* data is appended.
530	*/
531	volatile uint64_t cbFile;
532	/** List of new tasks. */
533	R3PTRTYPE(volatile PPDMACTASKFILE) pTasksNewHead;
534
535	/** Head of the small cache for allocated task segments for exclusive
536	* use by this endpoint. */
537	R3PTRTYPE(volatile PPDMACTASKFILE) pTasksFreeHead;
538	/** Tail of the small cache for allocated task segments for exclusive
539	* use by this endpoint. */
540	R3PTRTYPE(volatile PPDMACTASKFILE) pTasksFreeTail;
541	/** Number of elements in the cache. */
542	volatile uint32_t cTasksCached;
543
544	#ifdef VBOX_WITH_STATISTICS
545	uint32_t u32Alignment;
546	#endif
547	/** Cache of endpoint data. */
548	PDMACFILEENDPOINTCACHE DataCache;
549	/** Pointer to the associated bandwidth control manager */
550	PPDMACFILEBWMGR pBwMgr;
551
552	/** Flag whether a flush request is currently active */
553	PPDMACTASKFILE pFlushReq;
554
555	#ifdef VBOX_WITH_STATISTICS
556	/** Time spend in a read. */
557	STAMPROFILEADV StatRead;
558	/** Time spend in a write. */
559	STAMPROFILEADV StatWrite;
560	#endif
561
562	/** Event sempahore for blocking external events.
563	* The caller waits on it until the async I/O manager
564	* finished processing the event. */
565	RTSEMEVENT EventSemBlock;
566	/** Flag whether caching is enabled for this file. */
567	bool fCaching;
568	/** Flag whether the file was opened readonly. */
569	bool fReadonly;
570	/** Flag whether the host supports the async flush API. */
571	bool fAsyncFlushSupported;
572	/** Flag whether a blocking event is pending and needs
573	* processing by the I/O manager. */
574	bool fBlockingEventPending;
575	/** Blocking event type */
576	PDMACEPFILEBLOCKINGEVENT enmBlockingEvent;
577
578	/** Additional data needed for the event types. */
579	union
580	{
581	/** Cancelation event. */
582	struct
583	{
584	/** The task to cancel. */
585	PPDMACTASKFILE pTask;
586	} Cancel;
587	} BlockingEventData;
588	/** Data for exclusive use by the assigned async I/O manager. */
589	struct
590	{
591	/** Pointer to the next endpoint assigned to the manager. */
592	R3PTRTYPE(PPDMASYNCCOMPLETIONENDPOINTFILE) pEndpointNext;
593	/** Pointer to the previous endpoint assigned to the manager. */
594	R3PTRTYPE(PPDMASYNCCOMPLETIONENDPOINTFILE) pEndpointPrev;
595	/** List of pending requests (not submitted due to usage restrictions
596	* or a pending flush request) */
597	R3PTRTYPE(PPDMACTASKFILE) pReqsPendingHead;
598	/** Tail of pending requests. */
599	R3PTRTYPE(PPDMACTASKFILE) pReqsPendingTail;
600	/** Tree of currently locked ranges.
601	* If a write task is enqueued the range gets locked and any other
602	* task writing to that range has to wait until the task completes.
603	*/
604	PAVLRFOFFTREE pTreeRangesLocked;
605	/** Number of requests currently being processed for this endpoint
606	* (excluded flush requests). */
607	unsigned cRequestsActive;
608	/** Number of requests processed during the last second. */
609	unsigned cReqsPerSec;
610	/** Current number of processed requests for the current update period. */
611	unsigned cReqsProcessed;
612	/** Flag whether the endpoint is about to be moved to another manager. */
613	bool fMoving;
614	/** Destination I/O manager. */
615	PPDMACEPFILEMGR pAioMgrDst;
616	} AioMgr;
617	} PDMASYNCCOMPLETIONENDPOINTFILE;
618	/** Pointer to the endpoint class data. */
619	typedef PDMASYNCCOMPLETIONENDPOINTFILE *PPDMASYNCCOMPLETIONENDPOINTFILE;
620	#ifdef VBOX_WITH_STATISTICS
621	AssertCompileMemberAlignment(PDMASYNCCOMPLETIONENDPOINTFILE, StatRead, sizeof(uint64_t));
622	AssertCompileMemberAlignment(PDMASYNCCOMPLETIONENDPOINTFILE, DataCache, sizeof(uint64_t));
623	#endif
624
625	/** Request completion function */
626	typedef DECLCALLBACK(void) FNPDMACTASKCOMPLETED(PPDMACTASKFILE pTask, void *pvUser, int rc);
627	/** Pointer to a request completion function. */
628	typedef FNPDMACTASKCOMPLETED *PFNPDMACTASKCOMPLETED;
629
630	/**
631	* Transfer type.
632	*/
633	typedef enum PDMACTASKFILETRANSFER
634	{
635	/** Invalid. */
636	PDMACTASKFILETRANSFER_INVALID = 0,
637	/** Read transfer. */
638	PDMACTASKFILETRANSFER_READ,
639	/** Write transfer. */
640	PDMACTASKFILETRANSFER_WRITE,
641	/** Flush transfer. */
642	PDMACTASKFILETRANSFER_FLUSH
643	} PDMACTASKFILETRANSFER;
644
645	/**
646	* Data of a request.
647	*/
648	typedef struct PDMACTASKFILE
649	{
650	/** Pointer to the range lock we are waiting for */
651	PPDMACFILERANGELOCK pRangeLock;
652	/** Next task in the list. (Depending on the state) */
653	struct PDMACTASKFILE *pNext;
654	/** Endpoint */
655	PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint;
656	/** Transfer type. */
657	PDMACTASKFILETRANSFER enmTransferType;
658	/** Start offset */
659	RTFOFF Off;
660	/** Data segment. */
661	RTSGSEG DataSeg;
662	/** When non-zero the segment uses a bounce buffer because the provided buffer
663	* doesn't meet host requirements. */
664	size_t cbBounceBuffer;
665	/** Pointer to the used bounce buffer if any. */
666	void *pvBounceBuffer;
667	/** Start offset in the bounce buffer to copy from. */
668	uint32_t offBounceBuffer;
669	/** Flag whether this is a prefetch request. */
670	bool fPrefetch;
671	/** Completion function to call on completion. */
672	PFNPDMACTASKCOMPLETED pfnCompleted;
673	/** User data */
674	void *pvUser;
675	} PDMACTASKFILE;
676
677	/**
678	* Per task data.
679	*/
680	typedef struct PDMASYNCCOMPLETIONTASKFILE
681	{
682	/** Common data. */
683	PDMASYNCCOMPLETIONTASK Core;
684	/** Number of bytes to transfer until this task completes. */
685	volatile int32_t cbTransferLeft;
686	/** Flag whether the task completed. */
687	volatile bool fCompleted;
688	/** Return code. */
689	volatile int rc;
690	} PDMASYNCCOMPLETIONTASKFILE;
691
692	int pdmacFileAioMgrFailsafe(RTTHREAD ThreadSelf, void *pvUser);
693	int pdmacFileAioMgrNormal(RTTHREAD ThreadSelf, void *pvUser);
694
695	int pdmacFileAioMgrNormalInit(PPDMACEPFILEMGR pAioMgr);
696	void pdmacFileAioMgrNormalDestroy(PPDMACEPFILEMGR pAioMgr);
697
698	int pdmacFileAioMgrCreate(PPDMASYNCCOMPLETIONEPCLASSFILE pEpClass, PPPDMACEPFILEMGR ppAioMgr, PDMACEPFILEMGRTYPE enmMgrType);
699
700	int pdmacFileAioMgrAddEndpoint(PPDMACEPFILEMGR pAioMgr, PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
701
702	PPDMACTASKFILE pdmacFileEpGetNewTasks(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
703	PPDMACTASKFILE pdmacFileTaskAlloc(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
704	void pdmacFileTaskFree(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
705	PPDMACTASKFILE pTask);
706
707	int pdmacFileEpAddTask(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTask);
708
709	void pdmacFileEpTaskCompleted(PPDMACTASKFILE pTask, void *pvUser, int rc);
710
711	bool pdmacFileBwMgrIsTransferAllowed(PPDMACFILEBWMGR pBwMgr, uint32_t cbTransfer);
712
713	int pdmacFileCacheInit(PPDMASYNCCOMPLETIONEPCLASSFILE pClassFile, PCFGMNODE pCfgNode);
714	void pdmacFileCacheDestroy(PPDMASYNCCOMPLETIONEPCLASSFILE pClassFile);
715	int pdmacFileEpCacheInit(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONEPCLASSFILE pClassFile);
716	void pdmacFileEpCacheDestroy(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint);
717
718	int pdmacFileEpCacheRead(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONTASKFILE pTask,
719	RTFOFF off, PCRTSGSEG paSegments, size_t cSegments,
720	size_t cbRead);
721	int pdmacFileEpCacheWrite(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONTASKFILE pTask,
722	RTFOFF off, PCRTSGSEG paSegments, size_t cSegments,
723	size_t cbWrite);
724	int pdmacFileEpCacheFlush(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMASYNCCOMPLETIONTASKFILE pTask);
725
726	RT_C_DECLS_END
727
728	#endif
729

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source: vbox/trunk/src/VBox/VMM/PDMAsyncCompletionFileInternal.h@ 29450

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