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[NTOSKRNL]

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- Reference the cache segment when flushing to avoid a race between deleting the file cache and the balancer flushing pages to disk which causes random cache segments to be freed while we're holding a lock on it
- Fixes a crash in KeReleaseMutex (used to be a crash in ExReleasePushLock) during periods of high memory load

svn path=/trunk/; revision=54745
This commit is contained in:
Cameron Gutman
2011-12-23 23:20:09 +00:00
parent eaa88b7445
commit ed15dc5d11
1 changed files with 9 additions and 2 deletions
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reactos/ntoskrnl/cc/view.c
+9 -2
View File
@@ -204,10 +204,13 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count, BOOLEAN Wait)
DirtySegmentListEntry);
current_entry = current_entry->Flink;
CcRosCacheSegmentIncRefCount(current);
Locked = current->Bcb->Callbacks->AcquireForLazyWrite(
current->Bcb->LazyWriteContext, Wait);
if (!Locked)
{
CcRosCacheSegmentDecRefCount(current);
continue;
}
@@ -220,6 +223,7 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count, BOOLEAN Wait)
{
current->Bcb->Callbacks->ReleaseFromLazyWrite(
current->Bcb->LazyWriteContext);
CcRosCacheSegmentDecRefCount(current);
continue;
}
@@ -229,6 +233,7 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count, BOOLEAN Wait)
KeReleaseMutex(&current->Mutex, 0);
current->Bcb->Callbacks->ReleaseFromLazyWrite(
current->Bcb->LazyWriteContext);
CcRosCacheSegmentDecRefCount(current);
continue;
}
@@ -241,6 +246,9 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count, BOOLEAN Wait)
KeReleaseMutex(&current->Mutex, 0);
current->Bcb->Callbacks->ReleaseFromLazyWrite(
current->Bcb->LazyWriteContext);
KeAcquireGuardedMutex(&ViewLock);
CcRosCacheSegmentDecRefCount(current);
if (!NT_SUCCESS(Status) && (Status != STATUS_END_OF_FILE))
{
@@ -251,8 +259,7 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count, BOOLEAN Wait)
(*Count) += PagesPerSegment;
Target -= PagesPerSegment;
}
KeAcquireGuardedMutex(&ViewLock);
current_entry = DirtySegmentListHead.Flink;
}