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[NTOS:CM] Implement the shared lock macro for use

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CmpAcquireKcbLockSharedByKey can come in handy for use to lock KCBs by their convkey with a shared lock, specifically we would need this for cache lookup stuff.
This commit is contained in:
George Bișoc 2023-02-16 20:16:53 +01:00
parent 26fe3616fe
commit 8a335a3141
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1 changed files with 18 additions and 8 deletions
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26
ntoskrnl/include/internal/cm_x.h
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@ -89,6 +89,14 @@
(GET_HASH_ENTRY(CmpCacheTable, \
(k)->ConvKey)->Owner == KeGetCurrentThread())
//
// Shared acquires a KCB by index
//
#define CmpAcquireKcbLockSharedByIndex(i) \
{ \
ExAcquirePushLockShared(&CmpCacheTable[(i)].Lock); \
}
//
// Exclusively acquires a KCB by index
//
@ -120,6 +128,16 @@ CmpAcquireKcbLockExclusiveByKey(IN ULONG ConvKey)
CmpAcquireKcbLockExclusiveByIndex(GET_HASH_INDEX(ConvKey));
}
//
// Shared acquires a KCB by key
//
FORCEINLINE
VOID
CmpAcquireKcbLockSharedByKey(
_In_ ULONG ConvKey)
{
CmpAcquireKcbLockSharedByIndex(GET_HASH_INDEX(ConvKey));
}
//
// Shared acquires a KCB
@ -130,14 +148,6 @@ CmpAcquireKcbLockExclusiveByKey(IN ULONG ConvKey)
(k)->ConvKey)->Lock); \
}
//
// Shared acquires a KCB by index
//
#define CmpAcquireKcbLockSharedByIndex(i) \
{ \
ExAcquirePushLockShared(&CmpCacheTable[(i)].Lock); \
}
//
// Tries to convert a KCB lock
//