From fbcefe6339da3ad72686d8274b7a1bd57fad8959 Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Mon, 7 May 2018 14:05:18 -0700
Subject: [PATCH] dll: fuse: ioctl

---
 inc/fuse/fuse.h          |  2 +-
 inc/fuse/winfsp_fuse.h   | 11 +++++++++++
 src/dll/fuse/fuse_intf.c | 42 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/inc/fuse/fuse.h b/inc/fuse/fuse.h
index 1b01eadf..dd0c2c03 100644
--- a/inc/fuse/fuse.h
+++ b/inc/fuse/fuse.h
@@ -87,7 +87,7 @@ struct fuse_operations
     /* _ */ unsigned int flag_nopath:1;
     /* _ */ unsigned int flag_utime_omit_ok:1;
     /* _ */ unsigned int flag_reserved:29;
-    /* _ */ int (*ioctl)(const char *path, int cmd, void *arg, struct fuse_file_info *fi,
+    /* S */ int (*ioctl)(const char *path, int cmd, void *arg, struct fuse_file_info *fi,
         unsigned int flags, void *data);
     /* _ */ int (*poll)(const char *path, struct fuse_file_info *fi,
         struct fuse_pollhandle *ph, unsigned *reventsp);
diff --git a/inc/fuse/winfsp_fuse.h b/inc/fuse/winfsp_fuse.h
index 7f1b3ecf..38a8e244 100644
--- a/inc/fuse/winfsp_fuse.h
+++ b/inc/fuse/winfsp_fuse.h
@@ -53,6 +53,17 @@ extern "C" {
 #endif
 #endif
 
+#define FSP_FUSE_DEVICE_TYPE            (0x8000 | 'W' | 'F' * 0x100) /* DeviceIoControl -> ioctl */
+#define FSP_FUSE_CTLCODE_FROM_IOCTL(cmd)\
+    (FSP_FUSE_DEVICE_TYPE << 16) | (((c) & 0x0fff) << 2)
+#define FSP_FUSE_IOCTL(cmd, isiz, osiz) \
+    (                                   \
+        (((osiz) != 0) << 31) |         \
+        (((isiz) != 0) << 30) |         \
+        (((isiz) | (osiz)) << 16) |     \
+        (cmd)                           \
+    )
+
 /*
  * FUSE uses a number of types (notably: struct stat) that are OS specific.
  * Furthermore there are sometimes multiple definitions of the same type even
diff --git a/src/dll/fuse/fuse_intf.c b/src/dll/fuse/fuse_intf.c
index f764a449..3363a771 100644
--- a/src/dll/fuse/fuse_intf.c
+++ b/src/dll/fuse/fuse_intf.c
@@ -2125,6 +2125,47 @@ static NTSTATUS fsp_fuse_intf_DeleteReparsePoint(FSP_FILE_SYSTEM *FileSystem,
     return STATUS_ACCESS_DENIED;
 }
 
+static NTSTATUS fsp_fuse_intf_Control(FSP_FILE_SYSTEM *FileSystem,
+    PVOID FileNode, UINT32 ControlCode,
+    PVOID InputBuffer, ULONG InputBufferLength,
+    PVOID OutputBuffer, ULONG OutputBufferLength, PULONG PBytesTransferred)
+{
+    struct fuse *f = FileSystem->UserContext;
+    struct fsp_fuse_file_desc *filedesc = FileNode;
+    struct fuse_file_info fi;
+    int cmd;
+    int err;
+
+    if (0 == f->ops.ioctl)
+        return STATUS_INVALID_DEVICE_REQUEST;
+
+    if (FSP_FUSE_DEVICE_TYPE != DEVICE_TYPE_FROM_CTL_CODE(ControlCode))
+        return STATUS_INVALID_DEVICE_REQUEST;
+
+    if (0 != InputBufferLength && 0 != OutputBufferLength &&
+        InputBufferLength != OutputBufferLength)
+        return STATUS_INVALID_DEVICE_REQUEST;
+
+    memset(&fi, 0, sizeof fi);
+    fi.flags = filedesc->OpenFlags;
+    fi.fh = filedesc->FileHandle;
+
+    /* construct a Linux compatible ioctl code */
+    cmd = FSP_FUSE_IOCTL((ControlCode >> 2) & 0xfff, InputBufferLength, OutputBufferLength);
+
+    if (0 == OutputBufferLength)
+        err = f->ops.ioctl(filedesc->PosixPath, cmd, 0, &fi, 0, InputBuffer);
+    else
+    {
+        if (0 != InputBufferLength)
+            // OutputBuffer points to Response->Buffer which is FSP_FSCTL_TRANSACT_RSP_BUFFER_SIZEMAX long
+            memcpy(OutputBuffer, InputBuffer, InputBufferLength);
+        err = f->ops.ioctl(filedesc->PosixPath, cmd, 0, &fi, 0, OutputBuffer);
+    }
+
+    return fsp_fuse_ntstatus_from_errno(f->env, err);
+}
+
 FSP_FILE_SYSTEM_INTERFACE fsp_fuse_intf =
 {
     fsp_fuse_intf_GetVolumeInfo,
@@ -2152,6 +2193,7 @@ FSP_FILE_SYSTEM_INTERFACE fsp_fuse_intf =
     fsp_fuse_intf_DeleteReparsePoint,
     0,
     fsp_fuse_intf_GetDirInfoByName,
+    fsp_fuse_intf_Control,
 };
 
 /*