From 31c40d017d6e016178ac897eb68250896d61eb41 Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Fri, 4 Nov 2016 13:08:10 -0700
Subject: [PATCH] sys: create: allow user mode file system to disable caching
 for individual files

---
 inc/winfsp/fsctl.h | 1 +
 src/sys/create.c   | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/inc/winfsp/fsctl.h b/inc/winfsp/fsctl.h
index 81b314cc..7dcc92e6 100644
--- a/inc/winfsp/fsctl.h
+++ b/inc/winfsp/fsctl.h
@@ -388,6 +388,7 @@ typedef struct
                 UINT32 GrantedAccess;   /* FILE_{READ_DATA,WRITE_DATA,etc.} */
                 FSP_FSCTL_FILE_INFO FileInfo;
                 FSP_FSCTL_TRANSACT_BUF FileName;
+                UINT32 DisableCache:1;
             } Opened;
             /* IoStatus.Status == STATUS_REPARSE */
             struct
diff --git a/src/sys/create.c b/src/sys/create.c
index 0ab32728..71843c5b 100644
--- a/src/sys/create.c
+++ b/src/sys/create.c
@@ -843,7 +843,8 @@ NTSTATUS FspFsvolCreateComplete(
         FileObject->FsContext = FileNode;
         FileObject->FsContext2 = FileDesc;
         if (FspTimeoutInfinity32 == FsvolDeviceExtension->VolumeParams.FileInfoTimeout &&
-            !FlagOn(IrpSp->Parameters.Create.Options, FILE_NO_INTERMEDIATE_BUFFERING))
+            !FlagOn(IrpSp->Parameters.Create.Options, FILE_NO_INTERMEDIATE_BUFFERING) &&
+            !Response->Rsp.Create.Opened.DisableCache)
             /* enable caching! */
             SetFlag(FileObject->Flags, FO_CACHE_SUPPORTED);