Talk:Btrfs/System Root Guide
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This one looks pretty rough. I think users would benefit from a simpler case, like having only a regular, big rootfs, converting that in-place and getting a regular, non-RAID btrfs that boots fine without initramfs. Michał Górny (talk) 06:18, 26 July 2013 (UTC)
When you copy ext4->btrfs with tar, you may lose capabilities
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This discussion is done.
Maybe it's worth mentioning (or figuring out how to avoid) losing capabilities when you copy the fs across, in my case from ext4. Admittedly, I didn't use the p option in tar, as I was running as root (and p is the default).
Examples are: ping, PAM. I fixed ping with setcap and re-emerged PAM to e.g., access crontab -e.
EDIT: Maybe tar needs the --xattrs flag :) EDIT2: Amended this myself for / and /boot (for good measure, as it won't hurt). Closing this discussion.