XFS on Linux does not set dirent.d_type,
therefore fallback to stat() if dirent.d_type is not set,
this fixes slash after directory name in ngx_http_autoindex_module;
the issue has been introduced in r2235

src/os/unix/ngx_files.c

diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index 661ecaa..1203989 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -249,11 +249,6 @@
     }
 
     dir->valid_info = 0;
-#if (NGX_HAVE_D_TYPE)
-    dir->valid_type = 1;
-#else
-    dir->valid_type = 0;
-#endif
 
     return NGX_OK;
 }
@@ -267,6 +262,9 @@
     if (dir->de) {
 #if (NGX_HAVE_D_TYPE)
         dir->type = dir->de->d_type;
+        dir->valid_type = dir->type ? 1 : 0;
+#else
+        dir->valid_type = 0;
 #endif
         return NGX_OK;
     }

src/os/unix/ngx_files.h

diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index fe14887..068b4d8 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -200,10 +200,25 @@
 
 #if (NGX_HAVE_D_TYPE)
 
+#if (NGX_LINUX)
+
+/* XFS on Linux does not set dirent.d_type */
+
+#define ngx_de_is_dir(dir)                                                   \
+    (((dir)->type) ? ((dir)->type == DT_DIR) : (S_ISDIR((dir)->info.st_mode)))
+#define ngx_de_is_file(dir)                                                  \
+    (((dir)->type) ? ((dir)->type == DT_REG) : (S_ISREG((dir)->info.st_mode)))
+#define ngx_de_is_link(dir)                                                  \
+    (((dir)->type) ? ((dir)->type == DT_LINK) : (S_ISLNK((dir)->info.st_mode)))
+
+#else
+
 #define ngx_de_is_dir(dir)       ((dir)->type == DT_DIR)
 #define ngx_de_is_file(dir)      ((dir)->type == DT_REG)
 #define ngx_de_is_link(dir)      ((dir)->type == DT_LINK)
 
+#endif /* NGX_LINUX */
+
 #else
 
 #define ngx_de_is_dir(dir)       (S_ISDIR((dir)->info.st_mode))