linux-kernel - Re: [PATCH v3] nvme: revalidate paths during rescan

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Message-ID: <20210818124454.vcfid2otecdprlsh@carbon.lan>
Date:   Wed, 18 Aug 2021 14:44:54 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.de>,
        Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH v3] nvme: revalidate paths during rescan

On Wed, Aug 11, 2021 at 05:28:03PM +0200, Daniel Wagner wrote:
> From: Hannes Reinecke <hare@...e.de>
> 
> When triggering a rescan due to a namespace resize we will be
> receiving AENs on every controller, triggering a rescan of all
> attached namespaces. If multipath is active only the current path and
> the ns_head disk will be updated, the other paths will still refer to
> the old size until AENs for the remaining controllers are received.
> 
> If I/O comes in before that it might be routed to one of the old
> paths, triggering an I/O failure with 'access beyond end of device'.
> With this patch the old paths are skipped from multipath path
> selection until the controller serving these paths has been rescanned.

ping