Added "rootfs" feature.

src/nxt_fs.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_FS_H_INCLUDED_
+#define _NXT_FS_H_INCLUDED_
+
+
+#ifdef MS_BIND
+#define NXT_MS_BIND MS_BIND
+#else
+#define NXT_MS_BIND 0
+#endif
+
+#ifdef MS_REC
+#define NXT_MS_REC MS_BIND
+#else
+#define NXT_MS_REC 0
+#endif
+
+
+typedef struct {
+    u_char     *src;
+    u_char     *dst;
+    u_char     *fstype;
+    nxt_int_t  flags;
+    u_char     *data;
+} nxt_fs_mount_t;
+
+
+nxt_int_t nxt_fs_mkdir_all(const u_char *dir, mode_t mode);
+nxt_int_t nxt_fs_mount(nxt_task_t *task, nxt_fs_mount_t *mnt);
+void nxt_fs_unmount(const u_char *path);
+
+
+#endif  /* _NXT_FS_H_INCLUDED_ */