Alexandre Julliard : ntdll: Implement FSCTL_GET_OBJECT_ID to retrieve a file id.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 251335cdf35d4ff1fcae9c73f77136c9b85e7d96
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=251335cdf35d4ff1fcae9c73f77136c9b85e7d96

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Sun Jun 21 16:25:59 2020 +0200

ntdll: Implement FSCTL_GET_OBJECT_ID to retrieve a file id.

It can be used instead of FileIdInformation to avoid depending on
mountmgr.

Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/ntdll/unix/file.c | 23 +++++++++++++++++++++++
 include/winternl.h     | 15 +++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index ca6899b50f..bf1354f46e 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -5666,6 +5666,29 @@ NTSTATUS WINAPI NtFsControlFile( HANDLE handle, HANDLE event, PIO_APC_ROUTINE ap
         }
         break;
     }
+
+    case FSCTL_GET_OBJECT_ID:
+    {
+        FILE_OBJECTID_BUFFER *info = out_buffer;
+        int fd, needs_close;
+        struct stat st;
+
+        io->Information = 0;
+        if (out_size >= sizeof(*info))
+        {
+            status = server_get_unix_fd( handle, 0, &fd, &needs_close, NULL, NULL );
+            if (status) break;
+            fstat( fd, &st );
+            if (needs_close) close( fd );
+            memset( info, 0, sizeof(*info) );
+            memcpy( info->ObjectId, &st.st_dev, sizeof(st.st_dev) );
+            memcpy( info->ObjectId + 8, &st.st_ino, sizeof(st.st_ino) );
+            io->Information = sizeof(*info);
+        }
+        else status = STATUS_BUFFER_TOO_SMALL;
+        break;
+    }
+
     case FSCTL_SET_SPARSE:
         TRACE("FSCTL_SET_SPARSE: Ignoring request\n");
         io->Information = 0;
diff --git a/include/winternl.h b/include/winternl.h
index 0957561063..3ff15f28c1 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -744,6 +744,21 @@ typedef struct _FILE_PIPE_LOCAL_INFORMATION {
 #define FILE_PIPE_CONNECTED_STATE           0x00000003
 #define FILE_PIPE_CLOSING_STATE             0x00000004
 
+typedef struct _FILE_OBJECTID_BUFFER
+{
+    BYTE ObjectId[16];
+    union
+    {
+        struct
+        {
+            BYTE BirthVolumeId[16];
+            BYTE BirthObjectId[16];
+            BYTE DomainId[16];
+        } DUMMYSTRUCTNAME;
+        BYTE ExtendedInfo[48];
+    } DUMMYUNIONNAME;
+} FILE_OBJECTID_BUFFER, *PFILE_OBJECTID_BUFFER;
+
 typedef struct _FILE_OBJECTID_INFORMATION {
     LONGLONG FileReference;
     UCHAR ObjectId[16];