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[NTOS:CC] Unintialize private cache maps before purging the cache section

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Before purging the data cache of a certain section of a file from system cache, we have to unintialize the private cache maps of that section if a filesystem or any other component prompts the kernel to do so.
This commit is contained in:
George Bișoc 2022-01-30 11:12:31 +01:00
parent 8c6dcdcf81
commit 8bd980e483
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GPG key ID: 688C4FBE25D7DEF6
1 changed files with 24 additions and 5 deletions
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29
ntoskrnl/cc/fs.c
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@ -161,6 +161,7 @@ CcPurgeCacheSection (
IN BOOLEAN UninitializeCacheMaps)
{
PROS_SHARED_CACHE_MAP SharedCacheMap;
PPRIVATE_CACHE_MAP PrivateCacheMap;
LONGLONG StartOffset;
LONGLONG EndOffset;
LIST_ENTRY FreeList;
@ -173,11 +174,7 @@ CcPurgeCacheSection (
CCTRACE(CC_API_DEBUG, "SectionObjectPointer=%p\n FileOffset=%p Length=%lu UninitializeCacheMaps=%d",
SectionObjectPointer, FileOffset, Length, UninitializeCacheMaps);
if (UninitializeCacheMaps)
{
DPRINT1("FIXME: CcPurgeCacheSection not uninitializing private cache maps\n");
}
/* Obtain the shared cache from the section */
SharedCacheMap = SectionObjectPointer->SharedCacheMap;
if (!SharedCacheMap)
{
@ -185,6 +182,28 @@ CcPurgeCacheSection (
goto purgeMm;
}
if (UninitializeCacheMaps)
{
/*
* We have gotten the acknowledgement that
* the caller wants to unintialize the private
* cache maps so let's do this. Since we already
* have the shared cache map from above, iterate
* over that cache's private lists.
*/
while (!IsListEmpty(&SharedCacheMap->PrivateList))
{
/*
* This list is not empty, grab the
* private cache map.
*/
PrivateCacheMap = CONTAINING_RECORD(SharedCacheMap->PrivateList.Flink, PRIVATE_CACHE_MAP, PrivateLinks);
/* Unintialize the private cache now */
CcUninitializeCacheMap(PrivateCacheMap->FileObject, NULL, NULL);
}
}
StartOffset = FileOffset != NULL ? FileOffset->QuadPart : 0;
if (Length == 0 || FileOffset == NULL)
{