[pschweitzer] 67886: [NTOSKRNL] Short commit message: implementation of (names) tunnel cache in file system RTL. This is in the vast majority work done by Johannes Anderwald, I've just reviewed, fi...
24 May
2015
24 May
'15
5:42 p.m.
Author: pschweitzer
Date: Sun May 24 17:42:05 2015
New Revision: 67886
URL: http://svn.reactos.org/svn/reactos?rev=67886&view=rev
Log:
[NTOSKRNL]
Short commit message: implementation of (names) tunnel cache in file system RTL.
This is in the vast majority work done by Johannes Anderwald, I've just reviewed,
fixed a few things, and implemented last bits.
Thanks to Johannes for his initial implementation (and huge work!).
Dedicated to Hervé's secret plans ;-).
CORE-7272
CORE-3875
Modified:
trunk/reactos/ntoskrnl/fsrtl/fsrtlpc.c
trunk/reactos/ntoskrnl/fsrtl/tunnel.c
trunk/reactos/ntoskrnl/include/internal/fsrtl.h
Modified: trunk/reactos/ntoskrnl/fsrtl/fsrtlpc.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/fsrtl/fsrtlpc.c?r…
==============================================================================
--- trunk/reactos/ntoskrnl/fsrtl/fsrtlpc.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/fsrtl/fsrtlpc.c [iso-8859-1] Sun May 24 17:42:05 2015
@@ -170,6 +170,7 @@
IFS_POOL_TAG,
0);
+ FsRtlInitializeTunnels();
FsRtlInitializeLargeMcbs();
/* Allocate the Resource Buffer */
Modified: trunk/reactos/ntoskrnl/fsrtl/tunnel.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/fsrtl/tunnel.c?re…
==============================================================================
--- trunk/reactos/ntoskrnl/fsrtl/tunnel.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/fsrtl/tunnel.c [iso-8859-1] Sun May 24 17:42:05 2015
@@ -3,7 +3,8 @@
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/fsrtl/tunnel.c
* PURPOSE: Provides the Tunnel Cache implementation for file system drivers.
- * PROGRAMMERS: None.
+ * PROGRAMMERS: Johannes Anderwald (johannes.anderwald(a)reactos.org)
+ * Pierre Schweitzer (pierre(a)reactos.org)
*/
/* INCLUDES ******************************************************************/
@@ -12,11 +13,298 @@
#define NDEBUG
#include <debug.h>
+typedef struct {
+ RTL_SPLAY_LINKS SplayInfo;
+ LIST_ENTRY TimerQueueEntry;
+ LARGE_INTEGER Time;
+ ULONGLONG DirectoryKey;
+ ULONG Flags;
+ UNICODE_STRING LongName;
+ UNICODE_STRING ShortName;
+ PVOID Data;
+ ULONG DataLength;
+} TUNNEL_NODE_ENTRY, *PTUNNEL_NODE_ENTRY;
+
+ULONG TunnelMaxEntries = 256;
+ULONG TunnelMaxAge = 15;
+PAGED_LOOKASIDE_LIST TunnelLookasideList;
+
+#define DEFAULT_EXTRA_SIZE (72)
+#define DEFAULT_ENTRY_SIZE (sizeof(TUNNEL_NODE_ENTRY) + DEFAULT_EXTRA_SIZE)
+
+#define TUNNEL_FLAG_POOL 0x2
+#define TUNNEL_FLAG_KEY_SHORT_NAME 0x1
+
+VOID
+FsRtlFreeTunnelNode(
+ IN PTUNNEL_NODE_ENTRY CurEntry,
+ IN PLIST_ENTRY PoolList OPTIONAL)
+{
+ if (PoolList)
+ {
+ /* divert the linked list entry, it's not required anymore, but we need it */
+ InsertHeadList(PoolList, &CurEntry->TimerQueueEntry);
+ return;
+ }
+
+ if (CurEntry->Flags & TUNNEL_FLAG_POOL)
+ ExFreePool(CurEntry);
+ else
+ ExFreeToPagedLookasideList(&TunnelLookasideList, CurEntry);
+}
+
+VOID
+FsRtlRemoveNodeFromTunnel(
+ IN PTUNNEL Cache,
+ IN PTUNNEL_NODE_ENTRY CurEntry,
+ IN PLIST_ENTRY PoolList,
+ OUT PBOOLEAN Rebalance)
+{
+ /* delete entry and rebalance if required */
+ if (Rebalance && *Rebalance)
+ {
+ Cache->Cache = RtlDelete(&CurEntry->SplayInfo);
+ /* reset */
+ *Rebalance = FALSE;
+ }
+ else
+ {
+ RtlDeleteNoSplay(&CurEntry->SplayInfo, &Cache->Cache);
+ }
+
+ /* remove entry */
+ RemoveEntryList(&CurEntry->TimerQueueEntry);
+
+ /* free node entry */
+ FsRtlFreeTunnelNode(CurEntry, PoolList);
+
+ /* decrement node count */
+ Cache->NumEntries--;
+}
+
+VOID
+FsRtlPruneTunnelCache(
+ IN PTUNNEL Cache,
+ IN PLIST_ENTRY PoolList)
+{
+ PLIST_ENTRY Entry, NextEntry;
+ PTUNNEL_NODE_ENTRY CurEntry;
+ LARGE_INTEGER CurTime, OldTime;
+ BOOLEAN Rebalance = TRUE;
+ PAGED_CODE();
+
+ /* query time */
+ KeQuerySystemTime(&CurTime);
+
+ /* subtract maximum node age */
+ OldTime.QuadPart = CurTime.QuadPart - TunnelMaxAge;
+
+ /* free all entries */
+ Entry = Cache->TimerQueue.Flink;
+
+ while(Entry != &Cache->TimerQueue)
+ {
+ /* get node entry */
+ CurEntry = (PTUNNEL_NODE_ENTRY)CONTAINING_RECORD(Entry, TUNNEL_NODE_ENTRY,
TimerQueueEntry);
+
+ /* get next entry */
+ NextEntry = Entry->Flink;
+
+ /* prune if expired OR if in advance in time */
+ if (CurEntry->Time.QuadPart < OldTime.QuadPart ||
+ CurEntry->Time.QuadPart > CurTime.QuadPart)
+ {
+ FsRtlRemoveNodeFromTunnel(Cache, CurEntry, PoolList, &Rebalance);
+ }
+
+ /* move to next entry */
+ Entry = NextEntry;
+ }
+
+ /* If we have too many entries */
+ while (Cache->NumEntries > TunnelMaxEntries)
+ {
+ CurEntry = (PTUNNEL_NODE_ENTRY)CONTAINING_RECORD(Entry, TUNNEL_NODE_ENTRY,
TimerQueueEntry);
+ FsRtlRemoveNodeFromTunnel(Cache, CurEntry, PoolList, &Rebalance);
+ }
+}
+
+VOID
+FsRtlGetTunnelParameterValue(
+ IN PUNICODE_STRING ParameterName,
+ OUT PULONG Value)
+{
+ UNICODE_STRING Root =
RTL_CONSTANT_STRING(L"Registry\\Machine\\System\\CurrentControlSet\\Control\\FileSystem");
+ OBJECT_ATTRIBUTES ObjectAttributes;
+ HANDLE hKey;
+ NTSTATUS Status;
+ ULONG Length;
+ PKEY_VALUE_FULL_INFORMATION Info;
+
+ /* initialize object attributes */
+ InitializeObjectAttributes(&ObjectAttributes, &Root, OBJ_CASE_INSENSITIVE,
NULL, NULL);
+
+ /* open registry key */
+ Status = ZwOpenKey(&hKey, KEY_READ, &ObjectAttributes);
+
+ if (!NT_SUCCESS(Status))
+ {
+ /* failed to open key */
+ return;
+ }
+
+ /* query value size */
+ Status = ZwQueryValueKey(hKey, ParameterName, KeyValueFullInformation, NULL, 0,
&Length);
+
+ if (Status != STATUS_BUFFER_TOO_SMALL)
+ {
+ /* failed to query size */
+ ZwClose(hKey);
+ return;
+ }
+
+ /* allocate buffer */
+ Info = ExAllocatePool(PagedPool, Length);
+
+ if (!Info)
+ {
+ /* out of memory */
+ ZwClose(hKey);
+ return;
+ }
+
+ /* query value */
+ Status = ZwQueryValueKey(hKey, ParameterName, KeyValueFullInformation, NULL, 0,
&Length);
+
+ if (NT_SUCCESS(Status))
+ {
+ if (Info->DataLength)
+ {
+ /* store result */
+ *Value = (ULONG)((ULONG_PTR)Info + Info->DataOffset);
+ }
+ }
+
+ /* free buffer */
+ ExFreePool(Info);
+
+ /* close key */
+ ZwClose(hKey);
+}
+
+VOID
+NTAPI
+FsRtlInitializeTunnels()
+{
+ ULONG TunnelEntries;
+ UNICODE_STRING MaximumTunnelEntryAgeInSeconds =
RTL_CONSTANT_STRING(L"MaximumTunnelEntryAgeInSeconds");
+ UNICODE_STRING MaximumTunnelEntries = RTL_CONSTANT_STRING(
L"MaximumTunnelEntries");
+
+ /* check for nt */
+ if (MmIsThisAnNtAsSystem())
+ {
+ /* default */
+ TunnelMaxEntries = 1024;
+ }
+
+ /* check for custom override of max entries*/
+ FsRtlGetTunnelParameterValue(&MaximumTunnelEntries, &TunnelMaxEntries);
+
+ /* check for custom override of age*/
+ FsRtlGetTunnelParameterValue(&MaximumTunnelEntryAgeInSeconds, &TunnelMaxAge);
+
+ if (!TunnelMaxAge)
+ {
+ /* no age means no entries */
+ TunnelMaxEntries = 0;
+ }
+
+ /* get max entries */
+ TunnelEntries = TunnelMaxEntries;
+
+ /* convert to ticks */
+ TunnelMaxAge *= 10000000;
+
+ if(TunnelMaxEntries <= 65535)
+ {
+ /* use max 256 entries */
+ TunnelEntries = TunnelMaxEntries / 16;
+ }
+
+ if(!TunnelEntries && TunnelMaxEntries )
+ {
+ /* max tunnel entries was too small */
+ TunnelEntries = TunnelMaxEntries + 1;
+ }
+
+ if (TunnelEntries > 0xFFFF)
+ {
+ /* max entries is 256 */
+ TunnelEntries = 256;
+ }
+
+ /* initialize look aside list */
+ ExInitializePagedLookasideList(&TunnelLookasideList, NULL, NULL, 0,
DEFAULT_ENTRY_SIZE, 0 /*FIXME*/, TunnelEntries);
+}
+
+LONG
+FsRtlCompareNodeAndKey(
+ IN PTUNNEL_NODE_ENTRY CurEntry,
+ IN ULONGLONG DirectoryKey,
+ IN PUNICODE_STRING KeyString)
+{
+ PUNICODE_STRING String;
+ LONG Ret;
+
+ if (DirectoryKey > CurEntry->DirectoryKey)
+ {
+ Ret = 1;
+ }
+ else if (DirectoryKey < CurEntry->DirectoryKey)
+ {
+ Ret = -1;
+ }
+ else
+ {
+ if (CurEntry->Flags & TUNNEL_FLAG_KEY_SHORT_NAME)
+ {
+ /* use short name as key */
+ String = &CurEntry->ShortName;
+ }
+ else
+ {
+ /* use long name as key */
+ String = &CurEntry->LongName;
+ }
+
+ Ret = RtlCompareUnicodeString(KeyString, String, TRUE);
+ }
+
+ return Ret;
+}
+
+VOID
+FsRtlEmptyFreePoolList(
+ IN PLIST_ENTRY PoolList)
+{
+ PLIST_ENTRY CurEntry;
+ PTUNNEL_NODE_ENTRY CurNode;
+
+ /* loop over all the entry */
+ while (!IsListEmpty(PoolList))
+ {
+ /* and free them, one by one */
+ CurEntry = RemoveHeadList(PoolList);
+ CurNode = (PTUNNEL_NODE_ENTRY)CONTAINING_RECORD(CurEntry, TUNNEL_NODE_ENTRY,
TimerQueueEntry);
+ FsRtlFreeTunnelNode(CurNode, 0);
+ }
+}
+
/* PUBLIC FUNCTIONS **********************************************************/
/*++
* @name FsRtlAddToTunnelCache
- * @unimplemented
+ * @implemented
*
* FILLME
*
@@ -56,13 +344,228 @@
IN ULONG DataLength,
IN PVOID Data)
{
- /* Unimplemented */
- KeBugCheck(FILE_SYSTEM);
+ PTUNNEL_NODE_ENTRY NodeEntry;
+ PRTL_SPLAY_LINKS CurEntry, LastEntry;
+ ULONG Length;
+ LONG Result = 0;
+ BOOLEAN AllocatedFromPool = FALSE;
+ PUNICODE_STRING KeyString;
+ LIST_ENTRY PoolList;
+
+ PAGED_CODE();
+
+ /* check if tunnel cache is enabled */
+ if (!TunnelMaxEntries)
+ {
+ /* entries are disabled */
+ return;
+ }
+
+ /* initialize free pool list */
+ InitializeListHead(&PoolList);
+
+ /* calculate node length */
+ Length = sizeof(TUNNEL_NODE_ENTRY);
+
+ /* add data size */
+ Length += DataLength;
+
+ if (ShortName)
+ {
+ /* add short name length */
+ Length += ShortName->Length;
+ }
+
+ if (LongName)
+ {
+ /* add short name length */
+ Length += LongName->Length;
+ }
+
+ if (Length > DEFAULT_ENTRY_SIZE)
+ {
+ /* bigger than default entry */
+ NodeEntry = ExAllocatePool(NonPagedPool, Length);
+ AllocatedFromPool = TRUE;
+ }
+ else
+ {
+ /* get standard entry */
+ NodeEntry = ExAllocateFromPagedLookasideList(&TunnelLookasideList);
+ }
+
+ /* check for success */
+ if (!NodeEntry)
+ {
+ /* out of memory */
+ return;
+ }
+
+ /* acquire lock */
+ ExAcquireFastMutex(&Cache->Mutex);
+
+ /* now search cache for existing entries */
+ CurEntry = Cache->Cache;
+
+ /* check which key should be used for search */
+ KeyString = (KeyByShortName ? ShortName : LongName);
+
+ /* initialize last entry */
+ LastEntry = NULL;
+
+ while(CurEntry)
+ {
+ /* compare current node */
+ Result = FsRtlCompareNodeAndKey((PTUNNEL_NODE_ENTRY)CurEntry, DirectoryKey,
KeyString);
+
+ /* backup last entry */
+ LastEntry = CurEntry;
+
+ if (Result > 0)
+ {
+ /* current directory key is bigger */
+ CurEntry = CurEntry->LeftChild;
+ }
+ else
+ {
+ if (Result == 0)
+ {
+ /* found equal entry */
+ break;
+ }
+
+ /* current directory key is smaller */
+ CurEntry = CurEntry->RightChild;
+ }
+ }
+
+ /* initialize node entry */
+ RtlInitializeSplayLinks(&NodeEntry->SplayInfo);
+
+ if (CurEntry != NULL)
+ {
+ /* found existing item */
+ if (CurEntry->LeftChild)
+ {
+ /* update parent */
+ RtlInsertAsLeftChild(NodeEntry, CurEntry->LeftChild);
+ }
+
+ if (CurEntry->RightChild)
+ {
+ /* update parent */
+ RtlInsertAsRightChild(NodeEntry, CurEntry->RightChild);
+ }
+
+ if (CurEntry->Parent == CurEntry)
+ {
+ /* cur entry was root */
+ Cache->Cache = (struct _RTL_SPLAY_LINKS*)NodeEntry;
+ }
+ else
+ {
+ /* update parent node */
+ if (LastEntry->LeftChild == CurEntry)
+ {
+ RtlInsertAsLeftChild(LastEntry, NodeEntry);
+ }
+ else
+ {
+ RtlInsertAsRightChild(LastEntry, NodeEntry);
+ }
+ }
+
+ /* remove entry */
+ RemoveEntryList(&((PTUNNEL_NODE_ENTRY)LastEntry)->TimerQueueEntry);
+
+ /* free node entry */
+ FsRtlFreeTunnelNode((PTUNNEL_NODE_ENTRY)LastEntry, &PoolList);
+
+ /* decrement node count */
+ Cache->NumEntries--;
+ }
+ else
+ {
+ if (LastEntry == NULL)
+ {
+ /* first entry in tunnel cache */
+ Cache->Cache = (struct _RTL_SPLAY_LINKS*)NodeEntry;
+ }
+ else
+ {
+ if (Result > 0)
+ {
+ /* new left node */
+ RtlInsertAsLeftChild(LastEntry, NodeEntry);
+ }
+ else
+ {
+ /* new right node */
+ RtlInsertAsRightChild(LastEntry, NodeEntry);
+ }
+ }
+ }
+
+ /* initialize entry */
+ KeQuerySystemTime(&NodeEntry->Time);
+
+ NodeEntry->DirectoryKey = DirectoryKey;
+ NodeEntry->Flags = (AllocatedFromPool ? TUNNEL_FLAG_POOL : 0x0);
+ NodeEntry->Flags |= (KeyByShortName ? TUNNEL_FLAG_KEY_SHORT_NAME : 0x0);
+
+ if (ShortName)
+ {
+ /* copy short name */
+ NodeEntry->ShortName.Length = ShortName->Length;
+ NodeEntry->ShortName.MaximumLength = ShortName->Length;
+ NodeEntry->ShortName.Buffer = (LPWSTR)((ULONG_PTR)NodeEntry +
sizeof(TUNNEL_NODE_ENTRY));
+
+ RtlMoveMemory(NodeEntry->ShortName.Buffer, ShortName->Buffer,
ShortName->Length);
+ }
+ else
+ {
+ NodeEntry->ShortName.Length = NodeEntry->ShortName.MaximumLength = 0;
+ NodeEntry->ShortName.Buffer = NULL;
+ }
+
+ if (LongName)
+ {
+ /* copy long name */
+ NodeEntry->LongName.Length = LongName->Length;
+ NodeEntry->LongName.MaximumLength = LongName->Length;
+ NodeEntry->LongName.Buffer = (LPWSTR)((ULONG_PTR)NodeEntry +
sizeof(TUNNEL_NODE_ENTRY) + NodeEntry->ShortName.Length);
+
+ RtlMoveMemory(NodeEntry->LongName.Buffer, LongName->Buffer,
LongName->Length);
+ }
+ else
+ {
+ NodeEntry->LongName.Length = NodeEntry->LongName.MaximumLength = 0;
+ NodeEntry->LongName.Buffer = NULL;
+ }
+
+ NodeEntry->DataLength = DataLength;
+ NodeEntry->Data = (PVOID)((ULONG_PTR)NodeEntry + sizeof(TUNNEL_NODE_ENTRY) +
NodeEntry->ShortName.Length + NodeEntry->LongName.Length);
+ RtlMoveMemory(NodeEntry->Data, Data, DataLength);
+
+ /* increment node count */
+ Cache->NumEntries++;
+
+ /* insert into list */
+ InsertTailList(&Cache->TimerQueue, &NodeEntry->TimerQueueEntry);
+
+ /* prune cache */
+ FsRtlPruneTunnelCache(Cache, &PoolList);
+
+ /* release lock */
+ ExReleaseFastMutex(&Cache->Mutex);
+
+ /* free pool list */
+ FsRtlEmptyFreePoolList(&PoolList);
}
/*++
* @name FsRtlDeleteKeyFromTunnelCache
- * @unimplemented
+ * @implemented
*
* FILLME
*
@@ -82,13 +585,92 @@
FsRtlDeleteKeyFromTunnelCache(IN PTUNNEL Cache,
IN ULONGLONG DirectoryKey)
{
- /* Unimplemented */
- KeBugCheck(FILE_SYSTEM);
+ BOOLEAN Rebalance = TRUE;
+ LIST_ENTRY PoolList;
+ PTUNNEL_NODE_ENTRY CurNode;
+ PRTL_SPLAY_LINKS CurEntry, LastEntry = NULL, Successors;
+
+ PAGED_CODE();
+
+ /* check if tunnel cache is enabled */
+ if (!TunnelMaxEntries)
+ {
+ /* entries are disabled */
+ return;
+ }
+
+ /* initialize free pool list */
+ InitializeListHead(&PoolList);
+
+ /* acquire lock */
+ ExAcquireFastMutex(&Cache->Mutex);
+
+ /* Look for the entry */
+ CurEntry = Cache->Cache;
+ while (CurEntry)
+ {
+ CurNode = (PTUNNEL_NODE_ENTRY)CONTAINING_RECORD(CurEntry, TUNNEL_NODE_ENTRY,
SplayInfo);
+
+ if (CurNode->DirectoryKey > DirectoryKey)
+ {
+ /* current directory key is bigger */
+ CurEntry = CurEntry->LeftChild;
+ }
+ else if (CurNode->DirectoryKey < DirectoryKey)
+ {
+ /* if we have already found one suitable, break */
+ if (LastEntry != NULL)
+ {
+ break;
+ }
+
+ /* current directory key is smaller */
+ CurEntry = CurEntry->RightChild;
+ }
+ else
+ {
+ /* save and look for another */
+ LastEntry = CurEntry;
+ CurEntry = CurEntry->LeftChild;
+ }
+ }
+
+ /* was it found? */
+ if (LastEntry == NULL)
+ {
+ /* release tunnel lock */
+ ExReleaseFastMutex(&Cache->Mutex);
+
+ return;
+ }
+
+ /* delete any matching key */
+ do
+ {
+ CurNode = (PTUNNEL_NODE_ENTRY)CONTAINING_RECORD(LastEntry, TUNNEL_NODE_ENTRY,
SplayInfo);
+
+ Successors = RtlRealSuccessor(LastEntry);
+ if (CurNode->DirectoryKey != DirectoryKey)
+ {
+ break;
+ }
+
+ /* remove from tunnel */
+ FsRtlRemoveNodeFromTunnel(Cache, CurNode, &PoolList, &Rebalance);
+ LastEntry = Successors;
+ }
+ while (LastEntry != NULL);
+
+ /* release tunnel lock */
+ ExReleaseFastMutex(&Cache->Mutex);
+
+ /* free pool */
+ FsRtlEmptyFreePoolList(&PoolList);
}
/*++
* @name FsRtlDeleteTunnelCache
- * @unimplemented
+ * @implemented
*
* FILLME
*
@@ -104,12 +686,48 @@
NTAPI
FsRtlDeleteTunnelCache(IN PTUNNEL Cache)
{
- UNIMPLEMENTED;
+ PLIST_ENTRY Entry, NextEntry;
+ PTUNNEL_NODE_ENTRY CurEntry;
+
+ PAGED_CODE();
+
+ /* check if tunnel cache is enabled */
+ if (!TunnelMaxEntries)
+ {
+ /* entries are disabled */
+ return;
+ }
+
+ /* free all entries */
+ Entry = Cache->TimerQueue.Flink;
+
+ while(Entry != &Cache->TimerQueue)
+ {
+ /* get node entry */
+ CurEntry = (PTUNNEL_NODE_ENTRY)CONTAINING_RECORD(Entry, TUNNEL_NODE_ENTRY,
TimerQueueEntry);
+
+ /* get next entry */
+ NextEntry = Entry->Flink;
+
+ /* remove entry from list */
+ RemoveEntryList(&CurEntry->TimerQueueEntry);
+
+ /* free entry */
+ FsRtlFreeTunnelNode(CurEntry, NULL);
+
+ /* move to next entry */
+ Entry = NextEntry;
+ }
+
+ /* reset object */
+ Cache->Cache = NULL;
+ Cache->NumEntries = 0;
+ InitializeListHead(&Cache->TimerQueue);
}
/*++
* @name FsRtlFindInTunnelCache
- * @unimplemented
+ * @implemented
*
* FILLME
*
@@ -149,14 +767,111 @@
IN OUT PULONG DataLength,
OUT PVOID Data)
{
- /* Unimplemented */
- KeBugCheck(FILE_SYSTEM);
- return FALSE;
+ BOOLEAN Ret = FALSE;
+ PTUNNEL_NODE_ENTRY CurEntry;
+ LIST_ENTRY PoolList;
+ //NTSTATUS Status;
+ LONG Result;
+
+ PAGED_CODE();
+
+ /* check if tunnel cache is enabled */
+ if (!TunnelMaxEntries)
+ {
+ /* entries are disabled */
+ return FALSE;
+ }
+
+ /* initialize free pool list */
+ InitializeListHead(&PoolList);
+
+ /* acquire tunnel lock */
+ ExAcquireFastMutex(&Cache->Mutex);
+
+ /* prune old entries */
+ FsRtlPruneTunnelCache(Cache, &PoolList);
+
+ /* now search cache for existing entries */
+ CurEntry = (PTUNNEL_NODE_ENTRY)Cache->Cache;
+
+ while(CurEntry)
+ {
+ /* compare current node */
+ Result = FsRtlCompareNodeAndKey(CurEntry, DirectoryKey, Name);
+
+ if (Result > 0)
+ {
+ /* current directory key is bigger */
+ CurEntry = (PTUNNEL_NODE_ENTRY)CurEntry->SplayInfo.LeftChild;
+ }
+ else
+ {
+ if (Result == 0)
+ {
+ /* found equal entry */
+ break;
+ }
+
+ /* current directory key is smaller */
+ CurEntry = (PTUNNEL_NODE_ENTRY)CurEntry->SplayInfo.RightChild;
+ }
+ }
+
+ if (CurEntry != NULL)
+ {
+ _SEH2_TRY
+ {
+ /* copy short name */
+ RtlCopyUnicodeString(ShortName, &CurEntry->ShortName);
+
+ /* check size */
+ if (LongName->MaximumLength < CurEntry->LongName.Length)
+ {
+ /* buffer is too small */
+ LongName->Buffer = ExAllocatePool(PagedPool,
CurEntry->LongName.Length);
+ if (LongName->Buffer)
+ {
+ LongName->Length = CurEntry->LongName.Length;
+ LongName->MaximumLength = CurEntry->LongName.MaximumLength;
+ RtlMoveMemory(LongName->Buffer, CurEntry->LongName.Buffer,
CurEntry->LongName.Length);
+ }
+ }
+ else
+ {
+ /* buffer is big enough */
+ RtlCopyUnicodeString(LongName, &CurEntry->LongName);
+ }
+
+ /* copy data */
+ RtlMoveMemory(Data, CurEntry->Data, CurEntry->DataLength);
+
+ /* store size */
+ *DataLength = CurEntry->DataLength;
+
+ /* done */
+ Ret = TRUE;
+ }
+ _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
+ {
+ /* Get the status */
+ //Status = _SEH2_GetExceptionCode();
+ }
+ _SEH2_END;
+
+ }
+
+ /* release tunnel lock */
+ ExReleaseFastMutex(&Cache->Mutex);
+
+ /* free pool */
+ FsRtlEmptyFreePoolList(&PoolList);
+
+ return Ret;
}
/*++
- * @name FsRtlDeleteTunnelCache
- * @unimplemented
+ * @name FsRtlInitializeTunnelCache
+ * @implemented
*
* FILLME
*
@@ -172,7 +887,19 @@
NTAPI
FsRtlInitializeTunnelCache(IN PTUNNEL Cache)
{
- UNIMPLEMENTED;
+ PAGED_CODE();
+
+ /* initialize mutex */
+ ExInitializeFastMutex(&Cache->Mutex);
+
+ /* initialize node tree */
+ Cache->Cache = NULL;
+
+ /* initialize timer list */
+ InitializeListHead(&Cache->TimerQueue);
+
+ /* initialize node count */
+ Cache->NumEntries = 0;
}
/* EOF */
Modified: trunk/reactos/ntoskrnl/include/internal/fsrtl.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/…
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/fsrtl.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/include/internal/fsrtl.h [iso-8859-1] Sun May 24 17:42:05
2015
@@ -114,6 +114,12 @@
VOID
);
+VOID
+NTAPI
+FsRtlInitializeTunnels(
+ VOID
+);
+
//
// File contexts Routines
//
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pschweitzer＠svn.reactos.org