linux-kernel - Re: [RFC PATCHv5 0/6] zram: introduce writeback bio batching

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Message-ID: <d652n6zrqbkt4oltusd5egbnrvd5xz3k4kbmqnfuwuatdyuekn@22jscte4mx7m>
Date: Sun, 23 Nov 2025 09:22:48 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Yuwen Chen <ywen.chen@...mail.com>, akpm@...ux-foundation.org, bgeffon@...gle.com, 
	licayy@...look.com, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, minchan@...nel.org, richardycc@...gle.com
Subject: Re: [RFC PATCHv5 0/6] zram: introduce writeback bio batching

On (25/11/22 20:24), Gao Xiang wrote:
> > 
> > > zram(ext4) -> backing ext4/btrfs
> > 
> > This is not a valid configuration, as far as I'm concerned.
> > Unless I'm missing your point.
> 
> Why it's not valid? zram can be used as a regular virtual
> block device, and format with any fs, and mount the zram
> then.

If you want to move data between two filesystems, then just
mount both devices and cp/mv data between them.  zram is not
going to do that for you, zram writeback is for different
purpose.