From 69f51d153394c8b2223ffa3b92805dffe45f0673 Mon Sep 17 00:00:00 2001
From: Pierre Schweitzer <pierre@reactos.org>
Date: Sat, 17 Feb 2018 13:48:32 +0100
Subject: [PATCH] [FASTFAT] Drop read ahead locking routines in favor of lazy
 writer routines. This avoids code duplication while being consistent with MS
 FastFAT.

---
 drivers/filesystems/fastfat/fastio.c | 30 ----------------------------
 drivers/filesystems/fastfat/iface.c  |  4 ++--
 drivers/filesystems/fastfat/vfat.h   | 11 ----------
 3 files changed, 2 insertions(+), 43 deletions(-)

diff --git a/drivers/filesystems/fastfat/fastio.c b/drivers/filesystems/fastfat/fastio.c
index 58d3f0d587f..248f39f5bf9 100644
--- a/drivers/filesystems/fastfat/fastio.c
+++ b/drivers/filesystems/fastfat/fastio.c
@@ -753,36 +753,6 @@ VfatReleaseFromLazyWrite(
     ExReleaseResourceLite(&(Fcb->MainResource));
 }
 
-BOOLEAN
-NTAPI
-VfatAcquireForReadAhead(
-    IN PVOID Context,
-    IN BOOLEAN Wait)
-{
-    PVFATFCB Fcb = (PVFATFCB)Context;
-    ASSERT(Fcb);
-    DPRINT("VfatAcquireForReadAhead(): Fcb %p\n", Fcb);
-
-    if (!ExAcquireResourceExclusiveLite(&(Fcb->MainResource), Wait))
-    {
-        DPRINT("VfatAcquireForReadAhead(): ExReleaseResourceLite failed.\n");
-        return FALSE;
-    }
-    return TRUE;
-}
-
-VOID
-NTAPI
-VfatReleaseFromReadAhead(
-    IN PVOID Context)
-{
-    PVFATFCB Fcb = (PVFATFCB)Context;
-    ASSERT(Fcb);
-    DPRINT("VfatReleaseFromReadAhead(): Fcb %p\n", Fcb);
-
-    ExReleaseResourceLite(&(Fcb->MainResource));
-}
-
 INIT_SECTION
 VOID
 VfatInitFastIoRoutines(
diff --git a/drivers/filesystems/fastfat/iface.c b/drivers/filesystems/fastfat/iface.c
index c334a95aed4..02e570ea450 100644
--- a/drivers/filesystems/fastfat/iface.c
+++ b/drivers/filesystems/fastfat/iface.c
@@ -119,8 +119,8 @@ DriverEntry(
     /* Cache manager */
     VfatGlobalData->CacheMgrCallbacks.AcquireForLazyWrite = VfatAcquireForLazyWrite;
     VfatGlobalData->CacheMgrCallbacks.ReleaseFromLazyWrite = VfatReleaseFromLazyWrite;
-    VfatGlobalData->CacheMgrCallbacks.AcquireForReadAhead = VfatAcquireForReadAhead;
-    VfatGlobalData->CacheMgrCallbacks.ReleaseFromReadAhead = VfatReleaseFromReadAhead;
+    VfatGlobalData->CacheMgrCallbacks.AcquireForReadAhead = VfatAcquireForLazyWrite;
+    VfatGlobalData->CacheMgrCallbacks.ReleaseFromReadAhead = VfatReleaseFromLazyWrite;
 
     /* Fast I/O */
     VfatInitFastIoRoutines(&VfatGlobalData->FastIoDispatch);
diff --git a/drivers/filesystems/fastfat/vfat.h b/drivers/filesystems/fastfat/vfat.h
index f6e2aa64525..487b5f9ab2d 100644
--- a/drivers/filesystems/fastfat/vfat.h
+++ b/drivers/filesystems/fastfat/vfat.h
@@ -775,17 +775,6 @@ NTAPI
 VfatReleaseFromLazyWrite(
     IN PVOID Context);
 
-BOOLEAN
-NTAPI
-VfatAcquireForReadAhead(
-    IN PVOID Context,
-    IN BOOLEAN Wait);
-
-VOID
-NTAPI
-VfatReleaseFromReadAhead(
-    IN PVOID Context);
-
 /* fat.c */
 
 NTSTATUS