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pivot_root()? [LWN.net]
maxfragg · 2026-06-15 · via LWN.net comments

pivot_root()?

Posted Jun 15, 2026 7:06 UTC (Mon) by maxfragg (subscriber, #122266)
In reply to: pivot_root()? by abatters
Parent article: Practical uses for a null filesystem

that is correct.
the central issue is, that initramfs isn't truly a filesystem, but rather a way to populate the fs-cache without underlying backing filesystem/blockdevice.
Its an elegant hack that doesn't create a real mountpoint, so you can't pivot it out of the way.
initrd was actually creating a filesystem, but needed way more code to support it, so you could pivot away from it.
The issue isn't about the first real filesystem, but about the fact that initramfs creates a world before, without any true filesystem/mountpoint.