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[NTOSKRNL] When pinning data, try to find an already pinned BCB

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If found, attempt to lock it and return it.

This fixes a lot of CcPinRead tests (and seems to speed up a bit ReactOS)
This commit is contained in:
Pierre Schweitzer 2018-10-05 21:14:13 +02:00
parent 9fc75c1132
commit 7fd2751c87
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GPG key ID: 7545556C3D585B0B
1 changed files with 42 additions and 9 deletions
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51
ntoskrnl/cc/pin.c
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@ -299,6 +299,9 @@ CcPinRead (
OUT PVOID * Bcb, OUT PVOID * Bcb,
OUT PVOID * Buffer) OUT PVOID * Buffer)
{ {
KIRQL OldIrql;
BOOLEAN Result;
PINTERNAL_BCB iBcb;
PROS_SHARED_CACHE_MAP SharedCacheMap; PROS_SHARED_CACHE_MAP SharedCacheMap;
CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n", CCTRACE(CC_API_DEBUG, "FileOffset=%p FileOffset=%p Length=%lu Flags=0x%lx\n",
@ -320,17 +323,47 @@ CcPinRead (
++CcPinReadNoWait; ++CcPinReadNoWait;
} }
/* Map first */ KeAcquireSpinLock(&SharedCacheMap->BcbSpinLock, &OldIrql);
if (!CcpMapData(SharedCacheMap, FileOffset, Length, Flags, Bcb, Buffer)) iBcb = CcpFindBcb(SharedCacheMap, FileOffset, Length, TRUE);
{ KeReleaseSpinLock(&SharedCacheMap->BcbSpinLock, OldIrql);
return FALSE;
}
/* Pin then */ if (iBcb == NULL)
if (!CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
{ {
CcUnpinData(*Bcb); /* Map first */
return FALSE; if (!CcpMapData(SharedCacheMap, FileOffset, Length, Flags, Bcb, Buffer))
{
return FALSE;
}
/* Pin then */
if (!CcPinMappedData(FileObject, FileOffset, Length, Flags, Bcb))
{
CcUnpinData(*Bcb);
return FALSE;
}
}
/* We found a BCB, lock it and return it */
else
{
if (BooleanFlagOn(Flags, PIN_EXCLUSIVE))
{
Result = ExAcquireResourceExclusiveLite(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
}
else
{
Result = ExAcquireSharedStarveExclusive(&iBcb->Lock, BooleanFlagOn(Flags, PIN_WAIT));
}
if (!Result)
{
return FALSE;
}
++iBcb->PinCount;
++iBcb->RefCount;
*Bcb = iBcb;
*Buffer = (PUCHAR)iBcb->Vacb->BaseAddress + FileOffset->QuadPart % VACB_MAPPING_GRANULARITY;
} }
return TRUE; return TRUE;