VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMR3/PDMAsyncCompletionFileFailsafe.cpp@ 97698

Last change on this file since 97698 was 96407, checked in by vboxsync, 2 years ago

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1/* $Id: PDMAsyncCompletionFileFailsafe.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2/** @file
3 * PDM Async I/O - Transport data asynchronous in R3 using EMT.
4 * Simple File I/O manager.
5 */
6
7/*
8 * Copyright (C) 2006-2022 Oracle and/or its affiliates.
9 *
10 * This file is part of VirtualBox base platform packages, as
11 * available from https://www.virtualbox.org.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation, in version 3 of the
16 * License.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see <https://www.gnu.org/licenses>.
25 *
26 * SPDX-License-Identifier: GPL-3.0-only
27 */
28
29
30/*********************************************************************************************************************************
31* Header Files *
32*********************************************************************************************************************************/
33#define LOG_GROUP LOG_GROUP_PDM_ASYNC_COMPLETION
34#include <iprt/asm.h>
35#include <iprt/assert.h>
36#include <VBox/log.h>
37
38#include "PDMAsyncCompletionFileInternal.h"
39
40
41
42/**
43 * Put a list of tasks in the pending request list of an endpoint.
44 */
45DECLINLINE(void) pdmacFileAioMgrEpAddTaskList(PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint, PPDMACTASKFILE pTaskHead)
46{
47 /* Add the rest of the tasks to the pending list */
48 if (!pEndpoint->AioMgr.pReqsPendingHead)
49 {
50 Assert(!pEndpoint->AioMgr.pReqsPendingTail);
51 pEndpoint->AioMgr.pReqsPendingHead = pTaskHead;
52 }
53 else
54 {
55 Assert(pEndpoint->AioMgr.pReqsPendingTail);
56 pEndpoint->AioMgr.pReqsPendingTail->pNext = pTaskHead;
57 }
58
59 /* Update the tail. */
60 while (pTaskHead->pNext)
61 pTaskHead = pTaskHead->pNext;
62
63 pEndpoint->AioMgr.pReqsPendingTail = pTaskHead;
64 pTaskHead->pNext = NULL;
65}
66
67/**
68 * Processes a given task list for assigned to the given endpoint.
69 */
70static int pdmacFileAioMgrFailsafeProcessEndpointTaskList(PPDMACEPFILEMGR pAioMgr,
71 PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint,
72 PPDMACTASKFILE pTasks)
73{
74 int rc = VINF_SUCCESS;
75
76 while (pTasks)
77 {
78 RTMSINTERVAL msWhenNext;
79 PPDMACTASKFILE pCurr = pTasks;
80
81 if (!pdmacEpIsTransferAllowed(&pEndpoint->Core, (uint32_t)pCurr->DataSeg.cbSeg, &msWhenNext))
82 {
83 pAioMgr->msBwLimitExpired = RT_MIN(pAioMgr->msBwLimitExpired, msWhenNext);
84 break;
85 }
86
87 pTasks = pTasks->pNext;
88
89 switch (pCurr->enmTransferType)
90 {
91 case PDMACTASKFILETRANSFER_FLUSH:
92 {
93 rc = RTFileFlush(pEndpoint->hFile);
94 break;
95 }
96 case PDMACTASKFILETRANSFER_READ:
97 case PDMACTASKFILETRANSFER_WRITE:
98 {
99 if (pCurr->enmTransferType == PDMACTASKFILETRANSFER_READ)
100 {
101 rc = RTFileReadAt(pEndpoint->hFile, pCurr->Off,
102 pCurr->DataSeg.pvSeg,
103 pCurr->DataSeg.cbSeg,
104 NULL);
105 }
106 else
107 {
108 if (RT_UNLIKELY((uint64_t)pCurr->Off + pCurr->DataSeg.cbSeg > pEndpoint->cbFile))
109 {
110 ASMAtomicWriteU64(&pEndpoint->cbFile, pCurr->Off + pCurr->DataSeg.cbSeg);
111 RTFileSetSize(pEndpoint->hFile, pCurr->Off + pCurr->DataSeg.cbSeg);
112 }
113
114 rc = RTFileWriteAt(pEndpoint->hFile, pCurr->Off,
115 pCurr->DataSeg.pvSeg,
116 pCurr->DataSeg.cbSeg,
117 NULL);
118 }
119
120 break;
121 }
122 default:
123 AssertMsgFailed(("Invalid transfer type %d\n", pTasks->enmTransferType));
124 }
125
126 pCurr->pfnCompleted(pCurr, pCurr->pvUser, rc);
127 pdmacFileTaskFree(pEndpoint, pCurr);
128 }
129
130 if (pTasks)
131 {
132 /* Add the rest of the tasks to the pending list */
133 pdmacFileAioMgrEpAddTaskList(pEndpoint, pTasks);
134 }
135
136 return VINF_SUCCESS;
137}
138
139static int pdmacFileAioMgrFailsafeProcessEndpoint(PPDMACEPFILEMGR pAioMgr,
140 PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint)
141{
142 int rc = VINF_SUCCESS;
143 PPDMACTASKFILE pTasks = pEndpoint->AioMgr.pReqsPendingHead;
144
145 pEndpoint->AioMgr.pReqsPendingHead = NULL;
146 pEndpoint->AioMgr.pReqsPendingTail = NULL;
147
148 /* Process the request pending list first in case the endpoint was migrated due to an error. */
149 if (pTasks)
150 rc = pdmacFileAioMgrFailsafeProcessEndpointTaskList(pAioMgr, pEndpoint, pTasks);
151
152 if (RT_SUCCESS(rc))
153 {
154 pTasks = pdmacFileEpGetNewTasks(pEndpoint);
155
156 if (pTasks)
157 rc = pdmacFileAioMgrFailsafeProcessEndpointTaskList(pAioMgr, pEndpoint, pTasks);
158 }
159
160 return rc;
161}
162
163/**
164 * A fallback method in case something goes wrong with the normal
165 * I/O manager.
166 */
167DECLCALLBACK(int) pdmacFileAioMgrFailsafe(RTTHREAD hThreadSelf, void *pvUser)
168{
169 int rc = VINF_SUCCESS;
170 PPDMACEPFILEMGR pAioMgr = (PPDMACEPFILEMGR)pvUser;
171 NOREF(hThreadSelf);
172
173 while ( (pAioMgr->enmState == PDMACEPFILEMGRSTATE_RUNNING)
174 || (pAioMgr->enmState == PDMACEPFILEMGRSTATE_SUSPENDING))
175 {
176 ASMAtomicWriteBool(&pAioMgr->fWaitingEventSem, true);
177 if (!ASMAtomicReadBool(&pAioMgr->fWokenUp))
178 rc = RTSemEventWait(pAioMgr->EventSem, pAioMgr->msBwLimitExpired);
179 ASMAtomicWriteBool(&pAioMgr->fWaitingEventSem, false);
180 Assert(RT_SUCCESS(rc) || rc == VERR_TIMEOUT);
181
182 LogFlow(("Got woken up\n"));
183 ASMAtomicWriteBool(&pAioMgr->fWokenUp, false);
184
185 /* Process endpoint events first. */
186 PPDMASYNCCOMPLETIONENDPOINTFILE pEndpoint = pAioMgr->pEndpointsHead;
187 while (pEndpoint)
188 {
189 pAioMgr->msBwLimitExpired = RT_INDEFINITE_WAIT;
190 rc = pdmacFileAioMgrFailsafeProcessEndpoint(pAioMgr, pEndpoint);
191 AssertRC(rc);
192 pEndpoint = pEndpoint->AioMgr.pEndpointNext;
193 }
194
195 /* Now check for an external blocking event. */
196 if (pAioMgr->fBlockingEventPending)
197 {
198 switch (pAioMgr->enmBlockingEvent)
199 {
200 case PDMACEPFILEAIOMGRBLOCKINGEVENT_ADD_ENDPOINT:
201 {
202 PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointNew = pAioMgr->BlockingEventData.AddEndpoint.pEndpoint;
203 AssertMsg(RT_VALID_PTR(pEndpointNew), ("Adding endpoint event without a endpoint to add\n"));
204
205 pEndpointNew->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_ACTIVE;
206
207 pEndpointNew->AioMgr.pEndpointNext = pAioMgr->pEndpointsHead;
208 pEndpointNew->AioMgr.pEndpointPrev = NULL;
209 if (pAioMgr->pEndpointsHead)
210 pAioMgr->pEndpointsHead->AioMgr.pEndpointPrev = pEndpointNew;
211 pAioMgr->pEndpointsHead = pEndpointNew;
212
213 pAioMgr->cEndpoints++;
214
215 /*
216 * Process the task list the first time. There might be pending requests
217 * if the endpoint was migrated from another endpoint.
218 */
219 rc = pdmacFileAioMgrFailsafeProcessEndpoint(pAioMgr, pEndpointNew);
220 AssertRC(rc);
221 break;
222 }
223 case PDMACEPFILEAIOMGRBLOCKINGEVENT_REMOVE_ENDPOINT:
224 {
225 PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointRemove = pAioMgr->BlockingEventData.RemoveEndpoint.pEndpoint;
226 AssertMsg(RT_VALID_PTR(pEndpointRemove), ("Removing endpoint event without a endpoint to remove\n"));
227
228 pEndpointRemove->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_REMOVING;
229
230 PPDMASYNCCOMPLETIONENDPOINTFILE pPrev = pEndpointRemove->AioMgr.pEndpointPrev;
231 PPDMASYNCCOMPLETIONENDPOINTFILE pNext = pEndpointRemove->AioMgr.pEndpointNext;
232
233 if (pPrev)
234 pPrev->AioMgr.pEndpointNext = pNext;
235 else
236 pAioMgr->pEndpointsHead = pNext;
237
238 if (pNext)
239 pNext->AioMgr.pEndpointPrev = pPrev;
240
241 pAioMgr->cEndpoints--;
242 break;
243 }
244 case PDMACEPFILEAIOMGRBLOCKINGEVENT_CLOSE_ENDPOINT:
245 {
246 PPDMASYNCCOMPLETIONENDPOINTFILE pEndpointClose = pAioMgr->BlockingEventData.CloseEndpoint.pEndpoint;
247 AssertMsg(RT_VALID_PTR(pEndpointClose), ("Close endpoint event without a endpoint to Close\n"));
248
249 pEndpointClose->enmState = PDMASYNCCOMPLETIONENDPOINTFILESTATE_CLOSING;
250
251 /* Make sure all tasks finished. */
252 rc = pdmacFileAioMgrFailsafeProcessEndpoint(pAioMgr, pEndpointClose);
253 AssertRC(rc);
254 break;
255 }
256 case PDMACEPFILEAIOMGRBLOCKINGEVENT_SHUTDOWN:
257 pAioMgr->enmState = PDMACEPFILEMGRSTATE_SHUTDOWN;
258 break;
259 case PDMACEPFILEAIOMGRBLOCKINGEVENT_SUSPEND:
260 pAioMgr->enmState = PDMACEPFILEMGRSTATE_SUSPENDING;
261 break;
262 case PDMACEPFILEAIOMGRBLOCKINGEVENT_RESUME:
263 pAioMgr->enmState = PDMACEPFILEMGRSTATE_RUNNING;
264 break;
265 default:
266 AssertMsgFailed(("Invalid event type %d\n", pAioMgr->enmBlockingEvent));
267 }
268
269 ASMAtomicWriteBool(&pAioMgr->fBlockingEventPending, false);
270 pAioMgr->enmBlockingEvent = PDMACEPFILEAIOMGRBLOCKINGEVENT_INVALID;
271
272 /* Release the waiting thread. */
273 rc = RTSemEventSignal(pAioMgr->EventSemBlock);
274 AssertRC(rc);
275 }
276 }
277
278 return rc;
279}
280
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