Made license related changes

internal/uffd/fd.go

@@ -1,9 +1,10 @@
+// SPDX-License-Identifier: Apache-2.0
+// Modifications by M/S Omukk
+
 // Package uffd implements a userfaultfd-based memory server for Firecracker
 // snapshot restore. When a VM is restored from a snapshot, instead of loading
 // the entire memory file upfront, the UFFD handler intercepts page faults
 // and serves memory pages on demand from the snapshot's compact diff file.
-//
-// Inspired by e2b's UFFD implementation (Apache 2.0, modified by Omukk).
 package uffd
 
 /*

internal/uffd/region.go

@@ -1,3 +1,9 @@
+// SPDX-License-Identifier: Apache-2.0
+// Modifications by M/S Omukk
+//
+// Modifications by Omukk (Wrenn Sandbox): merged Region and Mapping into
+// single file, inlined shiftedOffset helper.
+
 package uffd
 
 import "fmt"

internal/uffd/server.go

@@ -1,3 +1,11 @@
+// SPDX-License-Identifier: Apache-2.0
+// Modifications by M/S Omukk
+//
+// Modifications by Omukk (Wrenn Sandbox): replaced errgroup with WaitGroup
+// + semaphore, replaced fdexit abstraction with pipe, integrated with
+// snapshot.Header-based DiffFileSource instead of block.ReadonlyDevice,
+// fixed EAGAIN handling in poll loop.
+
 package uffd
 
 /*