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List:       linux-bcache
Subject:    Upgrade path to bcachefs
From:       Killian De Volder <killian.de.volder () megasoft ! be>
Date:       2015-07-25 8:15:41
Message-ID: 55B345AD.9050204 () megasoft ! be
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I have been wondering:

If I recall correctly: the backing device is just a bunch of bytes right ?
(Excluding the bcache header.)

If the bcachefs header (for the backing device)  isn't bigger then bcache,
one should be able to write a tool to wipe the bcache header.
Could one copy the dev.data.first_sector from the bcache-header and write a new \
bcachefs-header using this information ?

So the steps could be:
 1) Remove the caching device.
 2) Unmount it (could be tricky in some situation, like the root mount)
 3) Run make-bcachefs --upgrade /dev/xxx
 4) Add your caching device.

-- 
Killian De Volder

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