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  • May 20, 2026, 1:17 AM

    Ever wondered how the #OpenZFS readonly filesystem property interacts with the ro and rw mount options, and if using mount(8) vs zfs-mount(8) changes anything, and if your choice of platform changes anything?

    I certainly hadn't, until I got a bug report that I'd subtly changed a couple of cases in 2.4.2 for Linux. I unbroke it, but not before spending a bunch of time trying to figure out what "unbroke" means. Emphasis on "trying".

    Here's the fix, with my endless 🤔 in the collapsed "bonus" section. Good speluncking opportunity available if you'd like to figure it out!

    github.com/openzfs/zfs/pull/18

    💬 2🔄 2⭐ 1

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