Re: btrfs and hibernation to swap file on it?

[Christoph Anton Mitterer <calestyo@scientia.org>]

Hey Andrei.

Thanks for your replies and sorry for my late answer but first I had
been on some diving trip and then had a cold until few days ago.


On Wed, 2022-09-28 at 22:12 +0300, Andrei Borzenkov wrote:
> There are quite some restrictions for using swapfile on btrfs, in
> particular, it must be preallocated and btrfs will refuse relocation
> of
> extents in this file.

I assume it only does so (refuse relocation) while it's actually an
active swap area (how would it know otherwise that the file is a swap
file)?


> kernel supports swapfile with multiple extents.

Ah, I see.


So, with the btrfsprogs, is there a way to get the offset?

The whole interface with specifying an offset seems to be quite unhandy
anyway (would be better for users IMO, if one could specify a pathname
and the kernel would find out the offset by itself)... but having to
download/compile a "3rd party" tool makes it even more cumbersome.


Cheers,
Chris.