On Wed, Dec 9, 2020 at 5:36 AM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote:
Small clarification. 'chattr +C' to set the C file attribute is
'nodatacow'. Since Btrfs is cow by default, it's generally OK to
assume cow unless this attribute is set. But there's a rather uncommon
and not highly recommended mount option too: nodatacow. This does not
set C attribute everywhere, but all the files written while this mount
option is used are nodatacow and will always be nodatacow.
Note that nodatacow (how ever you enable it) also means nodatasum,
i.e. no checksumming for data, and no compression.
Also, btrfs metadata (the file system itself) is always cow. It can't
be disabled.
What is the correct way to calculate the physical offset of the swap file in another subvolume ?
Regards,
Sreyan Chakravarty
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