sys: fast I/O and resource acquisition callbacks

build/VStudio/winfsp_sys.vcxproj

@@ -155,7 +155,7 @@
     <ClCompile Include="..\..\src\sys\dirctl.c" />
     <ClCompile Include="..\..\src\sys\driver.c" />
     <ClCompile Include="..\..\src\sys\ea.c" />
-    <ClCompile Include="..\..\src\sys\fastio.c" />
+    <ClCompile Include="..\..\src\sys\callbacks.c" />
     <ClCompile Include="..\..\src\sys\file.c" />
     <ClCompile Include="..\..\src\sys\fileinfo.c" />
     <ClCompile Include="..\..\src\sys\flush.c" />

build/VStudio/winfsp_sys.vcxproj.filters

@@ -71,9 +71,6 @@
     <ClCompile Include="..\..\src\sys\write.c">
       <Filter>Source</Filter>
     </ClCompile>
-    <ClCompile Include="..\..\src\sys\fastio.c">
-      <Filter>Source</Filter>
-    </ClCompile>
     <ClCompile Include="..\..\src\sys\fsctl.c">
       <Filter>Source</Filter>
     </ClCompile>
@@ -92,6 +89,9 @@
     <ClCompile Include="..\..\src\sys\wq.c">
       <Filter>Source</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\sys\callbacks.c">
+      <Filter>Source</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\src\sys\driver.h">

src/sys/callbacks.c

@@ -1,5 +1,6 @@
 /**
- * @file sys/fastio.c
+ * @file sys/callbacks.c
+ * Fast I/O and resource acquisition callbacks.
  *
  * @copyright 2015 Bill Zissimopoulos
  */
@@ -13,6 +14,16 @@ FAST_IO_ACQUIRE_FOR_MOD_WRITE FspAcquireForModWrite;
 FAST_IO_RELEASE_FOR_MOD_WRITE FspReleaseForModWrite;
 FAST_IO_ACQUIRE_FOR_CCFLUSH FspAcquireForCcFlush;
 FAST_IO_RELEASE_FOR_CCFLUSH FspReleaseForCcFlush;
+BOOLEAN FspAcquireForLazyWrite(
+    PVOID Context,
+    BOOLEAN Wait);
+VOID FspReleaseFromLazyWrite(
+    PVOID Context);
+BOOLEAN FspAcquireForReadAhead(
+    PVOID Context,
+    BOOLEAN Wait);
+VOID FspReleaseFromReadAhead(
+    PVOID Context);
 
 #ifdef ALLOC_PRAGMA
 #pragma alloc_text(PAGE, FspFastIoCheckIfPossible)
@@ -22,6 +33,10 @@ FAST_IO_RELEASE_FOR_CCFLUSH FspReleaseForCcFlush;
 #pragma alloc_text(PAGE, FspReleaseForModWrite)
 #pragma alloc_text(PAGE, FspAcquireForCcFlush)
 #pragma alloc_text(PAGE, FspReleaseForCcFlush)
+#pragma alloc_text(PAGE, FspAcquireForLazyWrite)
+#pragma alloc_text(PAGE, FspReleaseFromLazyWrite)
+#pragma alloc_text(PAGE, FspAcquireForReadAhead)
+#pragma alloc_text(PAGE, FspReleaseFromReadAhead)
 #endif
 
 BOOLEAN FspFastIoCheckIfPossible(
@@ -38,7 +53,7 @@ BOOLEAN FspFastIoCheckIfPossible(
 
     Result = FALSE;
 
-    FSP_LEAVE_BOOL("%s", "");
+    FSP_LEAVE_BOOL("FileObject=%p", FileObject);
 }
 
 VOID FspAcquireFileForNtCreateSection(
@@ -46,7 +61,7 @@ VOID FspAcquireFileForNtCreateSection(
 {
     FSP_ENTER_VOID(PAGED_CODE());
 
-    FSP_LEAVE_VOID("%s", "");
+    FSP_LEAVE_VOID("FileObject=%p", FileObject);
 }
 
 VOID FspReleaseFileForNtCreateSection(
@@ -54,7 +69,7 @@ VOID FspReleaseFileForNtCreateSection(
 {
     FSP_ENTER_VOID(PAGED_CODE());
 
-    FSP_LEAVE_VOID("%s", "");
+    FSP_LEAVE_VOID("FileObject=%p", FileObject);
 }
 
 NTSTATUS FspAcquireForModWrite(
@@ -67,7 +82,7 @@ NTSTATUS FspAcquireForModWrite(
 
     Result = STATUS_NOT_IMPLEMENTED;
 
-    FSP_LEAVE("%s", "");
+    FSP_LEAVE("FileObject=%p", FileObject);
 }
 
 NTSTATUS FspReleaseForModWrite(
@@ -79,7 +94,7 @@ NTSTATUS FspReleaseForModWrite(
 
     Result = STATUS_NOT_IMPLEMENTED;
 
-    FSP_LEAVE("%s", "");
+    FSP_LEAVE("FileObject=%p", FileObject);
 }
 
 NTSTATUS FspAcquireForCcFlush(
@@ -90,7 +105,7 @@ NTSTATUS FspAcquireForCcFlush(
 
     Result = STATUS_NOT_IMPLEMENTED;
 
-    FSP_LEAVE("%s", "");
+    FSP_LEAVE("FileObject=%p", FileObject);
 }
 
 NTSTATUS FspReleaseForCcFlush(
@@ -101,5 +116,43 @@ NTSTATUS FspReleaseForCcFlush(
 
     Result = STATUS_NOT_IMPLEMENTED;
 
-    FSP_LEAVE("%s", "");
+    FSP_LEAVE("FileObject=%p", FileObject);
+}
+
+BOOLEAN FspAcquireForLazyWrite(
+    PVOID Context,
+    BOOLEAN Wait)
+{
+    FSP_ENTER_BOOL(PAGED_CODE());
+
+    Result = FALSE;
+
+    FSP_LEAVE_BOOL("Context=%p, Wait=%d", Context, Wait);
+}
+
+VOID FspReleaseFromLazyWrite(
+    PVOID Context)
+{
+    FSP_ENTER_VOID(PAGED_CODE());
+
+    FSP_LEAVE_VOID("Context=%p", Context);
+}
+
+BOOLEAN FspAcquireForReadAhead(
+    PVOID Context,
+    BOOLEAN Wait)
+{
+    FSP_ENTER_BOOL(PAGED_CODE());
+
+    Result = FALSE;
+
+    FSP_LEAVE_BOOL("Context=%p, Wait=%d", Context, Wait);
+}
+
+VOID FspReleaseFromReadAhead(
+    PVOID Context)
+{
+    FSP_ENTER_VOID(PAGED_CODE());
+
+    FSP_LEAVE_VOID("Context=%p", Context);
 }

src/sys/driver.h

@@ -264,7 +264,7 @@ FSP_IOCMPL_DISPATCH FspFsvolSetVolumeInformationComplete;
 FSP_IOCMPL_DISPATCH FspFsvolShutdownComplete;
 FSP_IOCMPL_DISPATCH FspFsvolWriteComplete;
 
-/* fast I/O and resource acquisition */
+/* fast I/O and resource acquisition callbacks */
 FAST_IO_CHECK_IF_POSSIBLE FspFastIoCheckIfPossible;
 FAST_IO_ACQUIRE_FILE FspAcquireFileForNtCreateSection;
 FAST_IO_RELEASE_FILE FspReleaseFileForNtCreateSection;
@@ -272,6 +272,16 @@ FAST_IO_ACQUIRE_FOR_MOD_WRITE FspAcquireForModWrite;
 FAST_IO_RELEASE_FOR_MOD_WRITE FspReleaseForModWrite;
 FAST_IO_ACQUIRE_FOR_CCFLUSH FspAcquireForCcFlush;
 FAST_IO_RELEASE_FOR_CCFLUSH FspReleaseForCcFlush;
+BOOLEAN FspAcquireForLazyWrite(
+    PVOID Context,
+    BOOLEAN Wait);
+VOID FspReleaseFromLazyWrite(
+    PVOID Context);
+BOOLEAN FspAcquireForReadAhead(
+    PVOID Context,
+    BOOLEAN Wait);
+VOID FspReleaseFromReadAhead(
+    PVOID Context);
 
 /* memory allocation */
 #define FspAlloc(Size)                  ExAllocatePoolWithTag(PagedPool, Size, FSP_ALLOC_INTERNAL_TAG)

src/sys/file.c

@@ -84,7 +84,7 @@ NTSTATUS FspFileNodeCreate(PDEVICE_OBJECT DeviceObject,
     RtlZeroMemory(FileNode, sizeof *FileNode + ExtraSize);
     FileNode->Header.NodeTypeCode = FspFileNodeFileKind;
     FileNode->Header.NodeByteSize = sizeof *FileNode;
-    FileNode->Header.IsFastIoPossible = FastIoIsQuestionable;
+    FileNode->Header.IsFastIoPossible = FastIoIsNotPossible;
     FileNode->Header.Resource = &NonPaged->Resource;
     FileNode->Header.PagingIoResource = &NonPaged->PagingIoResource;
     FileNode->Header.ValidDataLength.QuadPart = MAXLONGLONG;