linux-kernel - Re: Some new bio merging behaviors in __bio_try_merge

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Message-ID: <9aa607da-6ccb-8166-22df-735a3b127f2e@aol.com>
Date:   Fri, 12 Apr 2019 00:25:19 +0800
From:   Gao Xiang <hsiangkao@....com>
To:     Christoph Hellwig <hch@...radead.org>,
        Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
        "linux-erofs@...ts.ozlabs.org" <linux-erofs@...ts.ozlabs.org>
Subject: Re: Some new bio merging behaviors in __bio_try_merge_page



On 2019/4/11 23:34, Christoph Hellwig wrote:
> On Thu, Apr 11, 2019 at 04:09:54PM +0800, Ming Lei wrote:
>> I don't think it is a good behaviour to use bio->bi_max_vecs to limit
>> max allowed page, you may see the idea from the naming simply...
>>
>> If there were other such drivers, we may fix it easily, and the following
>> patch should fix your issue:
> 
> Yep.  Consumers of the block layer really have no business at all
> looking at bi_vcnt.

Thanks for pointing out, Ming's solution is enough to solve erofs issue.

Thanks,
Gao XIang

>