linux-kernel - Re: [PATCH v2] xen-blkfront: allow discard-* nodes to be optional

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Date:   Tue, 19 Jan 2021 12:16:02 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Roger Pau Monne <roger.pau@...rix.com>,
        linux-kernel@...r.kernel.org
Cc:     Arthur Borsboom <arthurborsboom@...il.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Jens Axboe <axboe@...nel.dk>, xen-devel@...ts.xenproject.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v2] xen-blkfront: allow discard-* nodes to be optional

On 19.01.21 11:57, Roger Pau Monne wrote:
> This is inline with the specification described in blkif.h:
> 
>   * discard-granularity: should be set to the physical block size if
>     node is not present.
>   * discard-alignment, discard-secure: should be set to 0 if node not
>     present.
> 
> This was detected as QEMU would only create the discard-granularity
> node but not discard-alignment, and thus the setup done in
> blkfront_setup_discard would fail.
> 
> Fix blkfront_setup_discard to not fail on missing nodes, and also fix
> blkif_set_queue_limits to set the discard granularity to the physical
> block size if none is specified in xenbus.
> 
> Fixes: ed30bf317c5ce ('xen-blkfront: Handle discard requests.')
> Reported-by: Arthur Borsboom <arthurborsboom@...il.com>
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen

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