Re: mtdswap + ubi results in deadlock

[Richard Weinberger <richard.weinberger@xxxxxxxxx>]

On Tue, Oct 15, 2019 at 10:10 PM Emil Lenngren <emil.lenngren@xxxxxxxxx> wrote:
> Thanks for the tip, I'll try that. But just trying to find some
> information about GFP_NOFS, I found this article from 2003
> https://lwn.net/Articles/22909/. It says "The GFP_NOIO flag allows
> sleeping, but no I/O operations will be started to help satisfy the
> request. GFP_NOFS is a bit less restrictive; some I/O operations can
> be started (writing to a swap area, for example), but no filesystem
> operations will be performed.". I'm not sure how much has changed
> since 2003 but if I interpret it correctly then GFP_NOFS wouldn't work
> since that can still trigger a swap, which would result in the same
> recursive deadlock?

You are right, GFP_NOIO seems to be a better fit.
At least the block layer uses it too.

-- 
Thanks,
//richard

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