https://luth.io/tags/filesystems/ Recent content in Filesystems on Luther Monson Hugo en Thu, 06 Aug 2026 21:27:00 -0700 https://luth.io/blog/2026/08/ntfs-atomic-file-replacement-not-rename-fsync/ Thu, 06 Aug 2026 21:27:00 -0700 https://luth.io/blog/2026/08/ntfs-atomic-file-replacement-not-rename-fsync/ <p><a href="https://github.com/luthermonson/shipmates">shipmates</a> writes a lot of small state files that other processes read. Voyage plans and state, tracker files. Each of them has to be replaced atomically, so a reader sees the old file or the new one and never half of each. Each also has to be replaced durably. When the function returns success, a power cut doesn&rsquo;t take it back. Every Unix programmer knows the recipe for that. It doesn&rsquo;t work on Windows, and the reasons are more interesting than &ldquo;Windows is different&rdquo;.</p>