linux-kernel - Re: [PATCH 4/4] md: fast clone bio in bio_clone

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Date:   Mon, 6 Feb 2017 06:24:51 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
        <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        NeilBrown <neilb@...e.com>
Subject: Re: [PATCH 4/4] md: fast clone bio in bio_clone_mddev()

On Mon, Feb 06, 2017 at 06:43:32PM +0800, Ming Lei wrote:
> In theory, ->bio_set still might be NULL in case of failed memory allocation,
> please see md_run().

And that's something that should be fixed.  Silently not having mempool
is very bad behavior.