From: Christoph Hellwig <hch@lst.de>
To: Dave Chinner <david@fromorbit.com>
Cc: Ming Lei <tom.leiming@gmail.com>,
linux-block <linux-block@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
"open list:XFS FILESYSTEM" <linux-xfs@vger.kernel.org>,
Dave Chinner <dchinner@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Ming Lei <ming.lei@redhat.com>
Subject: Re: block: DMA alignment of IO buffer allocated from slab
Date: Fri, 21 Sep 2018 09:08:05 +0200 [thread overview]
Message-ID: <20180921070805.GC14529@lst.de> (raw)
In-Reply-To: <20180921015608.GA31060@dastard>
On Fri, Sep 21, 2018 at 11:56:08AM +1000, Dave Chinner wrote:
> > 3) If slab can't guarantee to return 512-aligned buffer, how to fix
> > this data corruption issue?
>
> I think that the block layer needs to check the alignment of memory
> buffers passed to it and take appropriate action rather than
> corrupting random memory and returning a sucess status to the bad
> bio.
Or just reject the I/O. But yes, we already have the
queue_dma_alignment helper in the block layer, we just don't do it
in the fast path. I think generic_make_request_checks needs to
check it, and print an error and return a warning if the alignment
requirement isn't met.
next prev parent reply other threads:[~2018-09-21 7:08 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-19 9:15 block: DMA alignment of IO buffer allocated from slab Ming Lei
2018-09-19 9:41 ` Vitaly Kuznetsov
2018-09-19 9:41 ` Vitaly Kuznetsov
2018-09-19 10:02 ` Ming Lei
2018-09-19 10:02 ` Ming Lei
2018-09-19 11:15 ` Vitaly Kuznetsov
2018-09-19 11:15 ` Vitaly Kuznetsov
2018-09-20 1:28 ` Ming Lei
2018-09-20 3:59 ` Yang Shi
2018-09-20 6:32 ` Christoph Hellwig
2018-09-20 6:31 ` Christoph Hellwig
2018-09-21 13:04 ` Vitaly Kuznetsov
2018-09-21 13:04 ` Vitaly Kuznetsov
2018-09-21 13:05 ` Christoph Hellwig
2018-09-21 15:00 ` Jens Axboe
2018-09-24 16:06 ` Christopher Lameter
2018-09-24 17:49 ` Jens Axboe
2018-09-24 18:00 ` Christopher Lameter
2018-09-24 18:09 ` Jens Axboe
2018-09-25 7:49 ` Dave Chinner
2018-09-25 15:44 ` Jens Axboe
2018-09-25 21:04 ` Matthew Wilcox
2018-09-23 22:42 ` Ming Lei
2018-09-24 9:46 ` Andrey Ryabinin
2018-09-24 14:19 ` Bart Van Assche
2018-09-24 14:43 ` Andrey Ryabinin
2018-09-24 14:43 ` Andrey Ryabinin
2018-09-24 15:08 ` Bart Van Assche
2018-09-24 15:52 ` Andrey Ryabinin
2018-09-24 15:58 ` Bart Van Assche
2018-09-24 16:07 ` Andrey Ryabinin
2018-09-24 16:19 ` Bart Van Assche
2018-09-24 16:47 ` Christopher Lameter
2018-09-24 18:57 ` Matthew Wilcox
2018-09-24 19:56 ` Bart Van Assche
2018-09-24 20:41 ` Matthew Wilcox
2018-09-24 20:54 ` Bart Van Assche
2018-09-24 21:09 ` Matthew Wilcox
2018-09-25 0:16 ` Ming Lei
2018-09-25 3:28 ` Matthew Wilcox
2018-09-25 4:10 ` Bart Van Assche
2018-09-25 4:44 ` Matthew Wilcox
2018-09-25 6:55 ` Ming Lei
2018-09-24 15:17 ` Christopher Lameter
2018-09-25 0:20 ` Ming Lei
2018-09-20 14:07 ` Bart Van Assche
2018-09-21 1:56 ` Dave Chinner
2018-09-21 1:56 ` Dave Chinner
2018-09-21 7:08 ` Christoph Hellwig [this message]
2018-09-21 7:25 ` Ming Lei
2018-09-21 14:59 ` Jens Axboe
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