linux-kernel - Re: [PATCH 03/27] block: drbd: remove impossible failure handling

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Date:	Tue, 5 Apr 2016 14:42:38 +0200
From:	Lars Ellenberg <lars.ellenberg@...bit.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	drbd-dev@...ts.linbit.com
Subject: Re: [PATCH 03/27] block: drbd: remove impossible failure handling

On Tue, Apr 05, 2016 at 07:56:48PM +0800, Ming Lei wrote:
> For a non-cloned bio, bio_add_page() only returns failure when
> the io vec table is full, but in that case, bio->bi_vcnt can't
> be zero at all.
> 
> So remove the impossible failure handling.

Before the immutable bvecs,
we did in fact see this trigger in the wild.
On "strange" deployments.

But for the current implementation of bio_add_page(),
you are correct, this is impossible now.

Ack.

Thanks,

    Lars