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[NTOSKRNL] Implement support for deferred writes in Cc.

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Namely, implement CcCanIWrite() (very basic, and likely wrong).
And implement CcDeferWrite() which will queue the write operation.

In CciLazyWriter() (which may be renamed CcWorkerThread() ;-)),
handle the queued write operations one by one. This is likely
not to be accurate, but, given we have only on FS supporting
this for now (NFS / RDBSS / Shares), this is OK.

CORE-14235
This commit is contained in:
Pierre Schweitzer 2018-01-23 22:56:23 +01:00
parent 07e6e9c9c1
commit 9a07c71eef
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GPG key ID: 7545556C3D585B0B
3 changed files with 101 additions and 2 deletions
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15
ntoskrnl/include/internal/cc.h
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@ -41,6 +41,10 @@
//
extern ULONG CcRosTraceLevel;
extern LIST_ENTRY DirtyVacbListHead;
extern ULONG CcDirtyPageThreshold;
extern ULONG CcTotalDirtyPages;
extern LIST_ENTRY CcDeferredWrites;
extern KSPIN_LOCK CcDeferredWriteSpinLock;
typedef struct _PF_SCENARIO_ID
{
@ -193,6 +197,17 @@ typedef struct _ROS_VACB
/* Pointer to the next VACB in a chain. */
} ROS_VACB, *PROS_VACB;
typedef struct _ROS_DEFERRED_WRITE_CONTEXT
{
LIST_ENTRY CcDeferredWritesEntry;
PFILE_OBJECT FileObject;
PCC_POST_DEFERRED_WRITE PostRoutine;
PVOID Context1;
PVOID Context2;
ULONG BytesToWrite;
BOOLEAN Retrying;
} ROS_DEFERRED_WRITE_CONTEXT, *PROS_DEFERRED_WRITE_CONTEXT;
typedef struct _INTERNAL_BCB
{
/* Lock */