fs: Initial VFS port

fs/init.c

@@ -1,3 +1,21 @@
-#include <zinnia/vfs.h>
+// SPDX-License-Identifier: ISC
 
-void vfs_init() {}
+#include <zinnia/alloc.h>
+#include <zinnia/assert.h>
+#include <zinnia/initgraph.h>
+#include <zinnia/vfs.h>
+#include "internal.h"
+
+static void vfs_stage_init(struct boot_info* info) {
+    // Mount a tmpfs as root.
+    struct vfs_mount* tmpfs;
+    errno_t status = vfs_mount("tmpfs", 0, nullptr, &tmpfs);
+    assert(status == 0, "Unable to mount the root tmpfs (%i)", status);
+
+    struct vfs_path root = {.mount = tmpfs, .entry = tmpfs->root};
+    vfs_set_root(root);
+    vfs_mount_unref(tmpfs);
+}
+
+INIT_TASK(vfs_stage, "fs.vfs", vfs_stage_init);
+INIT_DEPENDS(vfs_stage, mem_stage);