linux-kernel - Re: [PATCH] fs: guard_bio_eod() needs to consider partitions

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Date:   Tue, 24 Oct 2017 09:46:15 +0200
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Greg Edwards <gedwards@....com>, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs: guard_bio_eod() needs to consider partitions

On Tue, Oct 24, 2017 at 03:16:36AM +0100, Al Viro wrote:
> > Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index")
> > Signed-off-by: Greg Edwards <gedwards@....com>
> 
> That smells like a nasty source of overhead, especially on SMP boxen...

We could just use __disk_get_part similar to the partition remapping,
or just pass the block_device to guard_bio_eod.