linux-kernel - Re: [PATCH] btrfs: relax dev_replace rwsem usage on scrub with rst

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Message-ID: <24db4553-3d0f-41e3-beaf-4b325e9f8418@wdc.com>
Date: Wed, 14 Aug 2024 14:15:53 +0000
From: Johannes Thumshirn <Johannes.Thumshirn@....com>
To: Filipe Manana <fdmanana@...nel.org>, Johannes Thumshirn <jth@...nel.org>
CC: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, David Sterba
	<dsterba@...e.com>, "linux-btrfs@...r.kernel.org"
	<linux-btrfs@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Filipe Manana <fdmanana@...e.com>
Subject: Re: [PATCH] btrfs: relax dev_replace rwsem usage on scrub with rst

On 14.08.24 16:14, Filipe Manana wrote:
> I would suggest a different fix:
> 
> Make the device replace code store a pointer (or pid) of to the task
> running device replace, and at btrfs_map_block() don't take the
> semaphore if "current" matches that pointer/pid.
> 
> Wouldn't that work? Seems safe and simple to me.
> 


Hmm that could work, let me see.