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From: Ming Lei <ming.lei@redhat.com>
To: Martin Wilck <mwilck@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>, Jan Kara <jack@suse.com>,
	Hannes Reinecke <hare@suse.de>,
	Johannes Thumshirn <jthumshirn@suse.de>,
	Kent Overstreet <kent.overstreet@gmail.com>,
	Christoph Hellwig <hch@lst.de>,
	linux-block@vger.kernel.org
Subject: Re: [PATCH 2/2] blkdev: __blkdev_direct_IO_simple: make sure to fill up the bio
Date: Thu, 19 Jul 2018 18:21:23 +0800	[thread overview]
Message-ID: <20180719102122.GA20700@ming.t460p> (raw)
In-Reply-To: <20180719093918.28876-3-mwilck@suse.com>

On Thu, Jul 19, 2018 at 11:39:18AM +0200, Martin Wilck wrote:
> bio_iov_iter_get_pages() returns only pages for a single non-empty
> segment of the input iov_iter's iovec. This may be much less than the number
> of pages __blkdev_direct_IO_simple() is supposed to process. Call

In bio_iov_iter_get_pages(), iov_iter_get_pages() supposes to retrieve
as many as possible pages since both 'maxsize' and 'maxpages' are provided
to cover all.

So the question is why iov_iter_get_pages() doesn't work as expected?

Thanks,
Ming

  parent reply	other threads:[~2018-07-19 10:21 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-12 14:36 Silent data corruption in blkdev_direct_IO() Hannes Reinecke
2018-07-12 15:08 ` Jens Axboe
2018-07-12 16:11   ` Martin Wilck
2018-07-12 16:14   ` Hannes Reinecke
2018-07-12 16:20     ` Jens Axboe
2018-07-12 16:42       ` Jens Axboe
2018-07-13  6:47         ` Martin Wilck
2018-07-13 16:56         ` Martin Wilck
2018-07-13 18:00           ` Jens Axboe
2018-07-13 18:50             ` Jens Axboe
2018-07-13 22:21               ` Martin Wilck
2018-07-13 20:48             ` Martin Wilck
2018-07-13 20:52               ` Jens Axboe
2018-07-16 19:05                 ` Martin Wilck
2018-07-12 23:29 ` Ming Lei
2018-07-13 18:54   ` Jens Axboe
2018-07-13 22:29     ` Martin Wilck
2018-07-16 11:45       ` Ming Lei
2018-07-18  0:07         ` Martin Wilck
2018-07-18  2:48           ` Ming Lei
2018-07-18  7:32             ` Martin Wilck
2018-07-18  7:54               ` Ming Lei
2018-07-18  9:20                 ` Johannes Thumshirn
2018-07-18 11:40                   ` Jan Kara
2018-07-18 11:57                     ` Jan Kara
2018-07-19  9:39                 ` [PATCH 0/2] Fix silent " Martin Wilck
2018-07-19  9:39                   ` [PATCH 1/2] block: bio_iov_iter_get_pages: fix size of last iovec Martin Wilck
2018-07-19 10:05                     ` Hannes Reinecke
2018-07-19 10:09                     ` Ming Lei
2018-07-19 10:20                     ` Jan Kara
2018-07-19 14:52                     ` Christoph Hellwig
2018-07-19  9:39                   ` [PATCH 2/2] blkdev: __blkdev_direct_IO_simple: make sure to fill up the bio Martin Wilck
2018-07-19 10:06                     ` Hannes Reinecke
2018-07-19 10:21                     ` Ming Lei [this message]
2018-07-19 10:37                       ` Jan Kara
2018-07-19 10:46                         ` Ming Lei
2018-07-19 11:08                         ` Al Viro
2018-07-19 14:53                           ` Christoph Hellwig
2018-07-19 15:06                             ` Jan Kara
2018-07-19 15:11                               ` Christoph Hellwig
2018-07-19 19:21                                 ` Martin Wilck
2018-07-19 19:34                             ` Martin Wilck
2018-07-19 10:45                     ` Jan Kara
2018-07-19 12:23                       ` Martin Wilck
2018-07-19 15:15                         ` Jan Kara
2018-07-19 20:01                           ` Martin Wilck
2018-07-19 11:04                     ` Ming Lei
2018-07-19 11:56                       ` Jan Kara
2018-07-19 12:20                         ` Ming Lei
2018-07-19 15:21                           ` Jan Kara
2018-07-19 19:06                             ` Martin Wilck
2018-07-19 12:25                         ` Martin Wilck
2018-07-19 10:08                   ` [PATCH 0/2] Fix silent data corruption in blkdev_direct_IO() Hannes Reinecke
2018-07-19 14:50                   ` Christoph Hellwig

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