linux-kernel - Re: [PATCH v3] bcache: avoid oversized read request in cache missing code path

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Date:   Fri, 21 May 2021 11:30:08 +0800
From:   Coly Li <colyli@...e.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-bcache@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>
Subject: Re: [PATCH v3] bcache: avoid oversized read request in cache missing
 code path

On 5/20/21 4:05 PM, Christoph Hellwig wrote:
> This fix is pretty gross.  Adding pages to bios can fail for all kinds
> of reasons, so the fix is to use bio_add_page and check its return
> value, and if it needs another bio keep looping and chaining more bios.
> 

OK, I will try this idea and avoid to access BIO_MAX_VECS directly.

> And maybe capping the readahead to some sane upper bound still makes
> sense, but it should never look at BIO_MAX_VECS for that.
> 

Thanks for the hint.

Coly Li