diff --git a/drivers/filesystems/btrfs/btrfs.c b/drivers/filesystems/btrfs/btrfs.c
index 05db8c0e293..bdc29881459 100644
--- a/drivers/filesystems/btrfs/btrfs.c
+++ b/drivers/filesystems/btrfs/btrfs.c
@@ -464,7 +464,11 @@ BOOL get_xattr(_In_ _Requires_lock_held_(_Curr_->tree_lock) device_extension* Vc
 
 _Dispatch_type_(IRP_MJ_CLOSE)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_close(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_close(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp;
     device_extension* Vcb = DeviceObject->DeviceExtension;
@@ -513,7 +517,11 @@ end:
 
 _Dispatch_type_(IRP_MJ_FLUSH_BUFFERS)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_flush_buffers(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_flush_buffers(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation( Irp );
     PFILE_OBJECT FileObject = IrpSp->FileObject;
@@ -708,7 +716,11 @@ static BOOL lie_about_fs_type() {
 
 _Dispatch_type_(IRP_MJ_QUERY_VOLUME_INFORMATION)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_query_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_query_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     PIO_STACK_LOCATION IrpSp;
     NTSTATUS Status;
     ULONG BytesCopied = 0;
@@ -1147,7 +1159,11 @@ end:
 
 _Dispatch_type_(IRP_MJ_SET_VOLUME_INFORMATION)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_set_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_set_volume_information(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     device_extension* Vcb = DeviceObject->DeviceExtension;
     NTSTATUS Status;
@@ -2129,7 +2145,11 @@ NTSTATUS delete_fileref(_In_ file_ref* fileref, _In_opt_ PFILE_OBJECT FileObject
 
 _Dispatch_type_(IRP_MJ_CLEANUP)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_cleanup(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_cleanup(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     PFILE_OBJECT FileObject = IrpSp->FileObject;
@@ -4768,7 +4788,11 @@ static NTSTATUS verify_volume(_In_ PDEVICE_OBJECT devobj) {
 
 _Dispatch_type_(IRP_MJ_FILE_SYSTEM_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_file_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_file_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     PIO_STACK_LOCATION IrpSp;
     NTSTATUS Status;
     device_extension* Vcb = DeviceObject->DeviceExtension;
@@ -4849,7 +4873,11 @@ end:
 
 _Dispatch_type_(IRP_MJ_LOCK_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_lock_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_lock_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     fcb* fcb = IrpSp->FileObject->FsContext;
@@ -4888,7 +4916,11 @@ exit:
 
 _Dispatch_type_(IRP_MJ_SHUTDOWN)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_shutdown(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_shutdown(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     BOOL top_level;
     device_extension* Vcb = DeviceObject->DeviceExtension;
@@ -5010,7 +5042,11 @@ end:
 
 _Dispatch_type_(IRP_MJ_POWER)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_power(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_power(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     device_extension* Vcb = DeviceObject->DeviceExtension;
     BOOL top_level;
@@ -5051,7 +5087,11 @@ exit:
 
 _Dispatch_type_(IRP_MJ_SYSTEM_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
+#ifdef __REACTOS__
+static NTSTATUS NTAPI drv_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#else
 static NTSTATUS drv_system_control(_In_ PDEVICE_OBJECT DeviceObject, _In_ PIRP Irp) {
+#endif
     NTSTATUS Status;
     device_extension* Vcb = DeviceObject->DeviceExtension;
     BOOL top_level;
@@ -5580,6 +5620,30 @@ NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING Regi
 
     DriverObject->DriverExtension->AddDevice = AddDevice;
 
+#ifdef __REACTOS__
+    DriverObject->MajorFunction[IRP_MJ_CREATE]                   = drv_create;
+    DriverObject->MajorFunction[IRP_MJ_CLOSE]                    = drv_close;
+    DriverObject->MajorFunction[IRP_MJ_READ]                     = drv_read;
+    DriverObject->MajorFunction[IRP_MJ_WRITE]                    = drv_write;
+    DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION]        = drv_query_information;
+    DriverObject->MajorFunction[IRP_MJ_SET_INFORMATION]          = drv_set_information;
+    DriverObject->MajorFunction[IRP_MJ_QUERY_EA]                 = drv_query_ea;
+    DriverObject->MajorFunction[IRP_MJ_SET_EA]                   = drv_set_ea;
+    DriverObject->MajorFunction[IRP_MJ_FLUSH_BUFFERS]            = drv_flush_buffers;
+    DriverObject->MajorFunction[IRP_MJ_QUERY_VOLUME_INFORMATION] = drv_query_volume_information;
+    DriverObject->MajorFunction[IRP_MJ_SET_VOLUME_INFORMATION]   = drv_set_volume_information;
+    DriverObject->MajorFunction[IRP_MJ_DIRECTORY_CONTROL]        = drv_directory_control;
+    DriverObject->MajorFunction[IRP_MJ_FILE_SYSTEM_CONTROL]      = drv_file_system_control;
+    DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL]           = drv_device_control;
+    DriverObject->MajorFunction[IRP_MJ_SHUTDOWN]                 = drv_shutdown;
+    DriverObject->MajorFunction[IRP_MJ_LOCK_CONTROL]             = drv_lock_control;
+    DriverObject->MajorFunction[IRP_MJ_CLEANUP]                  = drv_cleanup;
+    DriverObject->MajorFunction[IRP_MJ_QUERY_SECURITY]           = drv_query_security;
+    DriverObject->MajorFunction[IRP_MJ_SET_SECURITY]             = drv_set_security;
+    DriverObject->MajorFunction[IRP_MJ_POWER]                    = drv_power;
+    DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL]           = drv_system_control;
+    DriverObject->MajorFunction[IRP_MJ_PNP]                      = drv_pnp;
+#else
     DriverObject->MajorFunction[IRP_MJ_CREATE]                   = (PDRIVER_DISPATCH)drv_create;
     DriverObject->MajorFunction[IRP_MJ_CLOSE]                    = (PDRIVER_DISPATCH)drv_close;
     DriverObject->MajorFunction[IRP_MJ_READ]                     = (PDRIVER_DISPATCH)drv_read;
@@ -5602,6 +5666,7 @@ NTSTATUS DriverEntry(_In_ PDRIVER_OBJECT DriverObject, _In_ PUNICODE_STRING Regi
     DriverObject->MajorFunction[IRP_MJ_POWER]                    = (PDRIVER_DISPATCH)drv_power;
     DriverObject->MajorFunction[IRP_MJ_SYSTEM_CONTROL]           = (PDRIVER_DISPATCH)drv_system_control;
     DriverObject->MajorFunction[IRP_MJ_PNP]                      = (PDRIVER_DISPATCH)drv_pnp;
+#endif
 
     init_fast_io_dispatch(&DriverObject->FastIoDispatch);
 
diff --git a/drivers/filesystems/btrfs/btrfs_drv.h b/drivers/filesystems/btrfs/btrfs_drv.h
index e5efc86b790..857555f7551 100644
--- a/drivers/filesystems/btrfs/btrfs_drv.h
+++ b/drivers/filesystems/btrfs/btrfs_drv.h
@@ -1282,7 +1282,7 @@ void free_write_data_stripes(write_data_context* wtc);
 
 _Dispatch_type_(IRP_MJ_WRITE)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 _Requires_lock_held_(c->lock)
 _When_(return != 0, _Releases_lock_(c->lock))
@@ -1304,7 +1304,7 @@ void add_extent(_In_ fcb* fcb, _In_ LIST_ENTRY* prevextle, _In_ __drv_aliasesMem
 
 _Dispatch_type_(IRP_MJ_DIRECTORY_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 ULONG get_reparse_tag(device_extension* Vcb, root* subvol, UINT64 inode, UINT8 type, ULONG atts, BOOL lxss, PIRP Irp);
 
@@ -1312,11 +1312,11 @@ ULONG get_reparse_tag(device_extension* Vcb, root* subvol, UINT64 inode, UINT8 t
 
 _Dispatch_type_(IRP_MJ_QUERY_SECURITY)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 _Dispatch_type_(IRP_MJ_SET_SECURITY)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 void fcb_get_sd(fcb* fcb, struct _fcb* parent, BOOL look_for_xattr, PIRP Irp);
 void add_user_mapping(WCHAR* sidstring, ULONG sidstringlength, UINT32 uid);
@@ -1330,19 +1330,19 @@ void find_gid(struct _fcb* fcb, struct _fcb* parfcb, PSECURITY_SUBJECT_CONTEXT s
 
 _Dispatch_type_(IRP_MJ_SET_INFORMATION)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 _Dispatch_type_(IRP_MJ_QUERY_INFORMATION)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 _Dispatch_type_(IRP_MJ_QUERY_EA)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 _Dispatch_type_(IRP_MJ_SET_EA)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 BOOL has_open_children(file_ref* fileref);
 NTSTATUS stream_set_end_of_file_information(device_extension* Vcb, UINT16 end, fcb* fcb, file_ref* fileref, BOOL advance_only);
@@ -1360,7 +1360,7 @@ NTSTATUS delete_reparse_point(PDEVICE_OBJECT DeviceObject, PIRP Irp);
 
 _Dispatch_type_(IRP_MJ_CREATE)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 NTSTATUS open_fileref(_Requires_lock_held_(_Curr_->tree_lock) _Requires_exclusive_lock_held_(_Curr_->fcb_lock) _In_ device_extension* Vcb, _Out_ file_ref** pfr,
                       _In_ PUNICODE_STRING fnus, _In_opt_ file_ref* related, _In_ BOOL parent, _Out_opt_ USHORT* parsed, _Out_opt_ ULONG* fn_offset, _In_ POOL_TYPE pooltype,
@@ -1412,7 +1412,7 @@ NTSTATUS update_dev_item(device_extension* Vcb, device* device, PIRP Irp);
 
 _Dispatch_type_(IRP_MJ_READ)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp);
+NTSTATUS NTAPI drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp);
 
 NTSTATUS read_data(_In_ device_extension* Vcb, _In_ UINT64 addr, _In_ UINT32 length, _In_reads_bytes_opt_(length*sizeof(UINT32)/Vcb->superblock.sector_size) UINT32* csum,
                    _In_ BOOL is_tree, _Out_writes_bytes_(length) UINT8* buf, _In_opt_ chunk* c, _Out_opt_ chunk** pc, _In_opt_ PIRP Irp, _In_ UINT64 generation, _In_ BOOL file_read,
@@ -1427,7 +1427,7 @@ void raid6_recover2(UINT8* sectors, UINT16 num_stripes, ULONG sector_size, UINT1
 
 _Dispatch_type_(IRP_MJ_PNP)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp);
+NTSTATUS NTAPI drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp);
 
 NTSTATUS pnp_surprise_removal(PDEVICE_OBJECT DeviceObject, PIRP Irp);
 NTSTATUS pnp_query_remove_device(PDEVICE_OBJECT DeviceObject, PIRP Irp);
@@ -1492,7 +1492,7 @@ UINT8 gdiv(UINT8 a, UINT8 b);
 
 _Dispatch_type_(IRP_MJ_DEVICE_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
+NTSTATUS NTAPI drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
 
 // in calcthread.c
 
diff --git a/drivers/filesystems/btrfs/create.c b/drivers/filesystems/btrfs/create.c
index cd1106477bf..39fbf09240a 100644
--- a/drivers/filesystems/btrfs/create.c
+++ b/drivers/filesystems/btrfs/create.c
@@ -3685,7 +3685,7 @@ static BOOL has_manage_volume_privilege(ACCESS_STATE* access_state, KPROCESSOR_M
 
 _Dispatch_type_(IRP_MJ_CREATE)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_create(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp;
     device_extension* Vcb = DeviceObject->DeviceExtension;
diff --git a/drivers/filesystems/btrfs/devctrl.c b/drivers/filesystems/btrfs/devctrl.c
index 06e0c658f50..1953360a06c 100644
--- a/drivers/filesystems/btrfs/devctrl.c
+++ b/drivers/filesystems/btrfs/devctrl.c
@@ -236,7 +236,7 @@ static NTSTATUS control_ioctl(PIRP Irp) {
 
 _Dispatch_type_(IRP_MJ_DEVICE_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     device_extension* Vcb = DeviceObject->DeviceExtension;
diff --git a/drivers/filesystems/btrfs/dirctrl.c b/drivers/filesystems/btrfs/dirctrl.c
index 25c9e9cc835..64ab60f15a2 100644
--- a/drivers/filesystems/btrfs/dirctrl.c
+++ b/drivers/filesystems/btrfs/dirctrl.c
@@ -1003,7 +1003,7 @@ end:
 
 _Dispatch_type_(IRP_MJ_DIRECTORY_CONTROL)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_directory_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     PIO_STACK_LOCATION IrpSp;
     NTSTATUS Status;
     ULONG func;
diff --git a/drivers/filesystems/btrfs/fileinfo.c b/drivers/filesystems/btrfs/fileinfo.c
index 9588ea177ec..1d03a669f41 100644
--- a/drivers/filesystems/btrfs/fileinfo.c
+++ b/drivers/filesystems/btrfs/fileinfo.c
@@ -2557,7 +2557,7 @@ end:
 
 _Dispatch_type_(IRP_MJ_SET_INFORMATION)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_set_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     device_extension* Vcb = DeviceObject->DeviceExtension;
@@ -3919,7 +3919,7 @@ exit:
 
 _Dispatch_type_(IRP_MJ_QUERY_INFORMATION)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_query_information(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     PIO_STACK_LOCATION IrpSp;
     NTSTATUS Status;
     fcb* fcb;
@@ -3967,7 +3967,7 @@ end:
 
 _Dispatch_type_(IRP_MJ_QUERY_EA)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_query_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     BOOL top_level;
     device_extension* Vcb = DeviceObject->DeviceExtension;
@@ -4203,7 +4203,7 @@ typedef struct {
 
 _Dispatch_type_(IRP_MJ_SET_EA)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_set_ea(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     device_extension* Vcb = DeviceObject->DeviceExtension;
     NTSTATUS Status;
     BOOL top_level;
diff --git a/drivers/filesystems/btrfs/pnp.c b/drivers/filesystems/btrfs/pnp.c
index 34997cfd592..5a7e91b4105 100644
--- a/drivers/filesystems/btrfs/pnp.c
+++ b/drivers/filesystems/btrfs/pnp.c
@@ -491,7 +491,7 @@ static NTSTATUS pdo_pnp(PDEVICE_OBJECT pdo, PIRP Irp) {
 
 _Dispatch_type_(IRP_MJ_PNP)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
+NTSTATUS NTAPI drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     device_extension* Vcb = DeviceObject->DeviceExtension;
     NTSTATUS Status;
diff --git a/drivers/filesystems/btrfs/read.c b/drivers/filesystems/btrfs/read.c
index 81fbec3d68c..4384d657846 100644
--- a/drivers/filesystems/btrfs/read.c
+++ b/drivers/filesystems/btrfs/read.c
@@ -3237,7 +3237,7 @@ NTSTATUS do_read(PIRP Irp, BOOLEAN wait, ULONG* bytes_read) {
 
 _Dispatch_type_(IRP_MJ_READ)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
+NTSTATUS NTAPI drv_read(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
     device_extension* Vcb = DeviceObject->DeviceExtension;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     PFILE_OBJECT FileObject = IrpSp->FileObject;
diff --git a/drivers/filesystems/btrfs/security.c b/drivers/filesystems/btrfs/security.c
index 8ba772f1e4c..e934cb47ee8 100644
--- a/drivers/filesystems/btrfs/security.c
+++ b/drivers/filesystems/btrfs/security.c
@@ -578,7 +578,7 @@ static NTSTATUS get_file_security(PFILE_OBJECT FileObject, SECURITY_DESCRIPTOR*
 
 _Dispatch_type_(IRP_MJ_QUERY_SECURITY)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_query_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     SECURITY_DESCRIPTOR* sd;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
@@ -743,7 +743,7 @@ end:
 
 _Dispatch_type_(IRP_MJ_SET_SECURITY)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_set_security(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
     PFILE_OBJECT FileObject = IrpSp->FileObject;
diff --git a/drivers/filesystems/btrfs/write.c b/drivers/filesystems/btrfs/write.c
index c3a8fb74760..7ede09ee6a9 100644
--- a/drivers/filesystems/btrfs/write.c
+++ b/drivers/filesystems/btrfs/write.c
@@ -4690,7 +4690,7 @@ exit:
 
 _Dispatch_type_(IRP_MJ_WRITE)
 _Function_class_(DRIVER_DISPATCH)
-NTSTATUS drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
+NTSTATUS NTAPI drv_write(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
     NTSTATUS Status;
     BOOL top_level;
     PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);