From: Eric Biggers <ebiggers@kernel.org>
To: Keith Busch <kbusch@kernel.org>
Cc: Keith Busch <kbusch@fb.com>,
linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
axboe@kernel.dk, Kernel Team <Kernel-team@fb.com>,
hch@lst.de, bvanassche@acm.org, damien.lemoal@opensource.wdc.com,
pankydev8@gmail.com
Subject: Re: [PATCHv4 8/9] block: relax direct io memory alignment
Date: Thu, 26 May 2022 11:13:52 -0700 [thread overview]
Message-ID: <Yo/DYI17KWgXJNyB@sol.localdomain> (raw)
In-Reply-To: <Yo+FtQ8GlHtMT3pT@kbusch-mbp.dhcp.thefacebook.com>
On Thu, May 26, 2022 at 07:50:45AM -0600, Keith Busch wrote:
> On Thu, May 26, 2022 at 12:29:41AM -0700, Eric Biggers wrote:
> > On Wed, May 25, 2022 at 06:06:12PM -0700, Keith Busch wrote:
> > > + /*
> > > + * Each segment in the iov is required to be a block size multiple.
> >
> > Where is this enforced?
>
> Right below the comment. If it isn't a block size multiple, then ALIGN_DOWN
> will eventually result in 0 and -EFAULT is returned.
That's interesting, I would have expected it to be checked in
blkdev_dio_aligned().
EFAULT isn't the correct error code for this case; it should be EINVAL as is
normally the case for bad alignment. See the man pages for read and write.
- Eric
next prev parent reply other threads:[~2022-05-26 18:13 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-26 1:06 [PATCHv4 0/9] direct io dma alignment Keith Busch
2022-05-26 1:06 ` [PATCHv4 1/9] block: fix infiniate loop for invalid zone append Keith Busch
2022-05-26 1:48 ` Damien Le Moal
2022-05-31 6:19 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 2/9] block/bio: remove duplicate append pages code Keith Busch
2022-05-26 1:06 ` [PATCHv4 3/9] block: export dma_alignment attribute Keith Busch
2022-05-26 7:30 ` Eric Biggers
2022-05-26 1:06 ` [PATCHv4 4/9] block: introduce bdev_dma_alignment helper Keith Busch
2022-05-26 1:06 ` [PATCHv4 5/9] block: add a helper function for dio alignment Keith Busch
2022-05-26 1:54 ` Damien Le Moal
2022-05-31 6:22 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 6/9] block/merge: count bytes instead of sectors Keith Busch
2022-05-26 1:57 ` Damien Le Moal
2022-05-31 6:25 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 7/9] block/bounce: " Keith Busch
2022-05-26 1:58 ` Damien Le Moal
2022-05-30 15:08 ` Pankaj Raghav
2022-05-31 6:26 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 8/9] block: relax direct io memory alignment Keith Busch
2022-05-26 2:03 ` Damien Le Moal
2022-05-26 7:29 ` Eric Biggers
2022-05-26 13:50 ` Keith Busch
2022-05-26 18:13 ` Eric Biggers [this message]
2022-05-26 18:55 ` Keith Busch
2022-05-26 20:32 ` Keith Busch
2022-05-31 6:30 ` Christoph Hellwig
2022-05-26 1:06 ` [PATCHv4 9/9] fs: add support for dma aligned direct-io Keith Busch
2022-05-26 2:01 ` Damien Le Moal
2022-05-31 6:29 ` Christoph Hellwig
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