From: keith.busch@intel.com (Keith Busch)
Subject: [PATCH 5/5] block: support large requests in blk_rq_map_user_iov
Date: Wed, 2 Mar 2016 19:34:22 +0000 [thread overview]
Message-ID: <20160302193422.GE27636@localhost.localdomain> (raw)
In-Reply-To: <1456938434-20387-6-git-send-email-hch@lst.de>
On Wed, Mar 02, 2016@06:07:14PM +0100, Christoph Hellwig wrote:
> This patch adds support for larger requests in blk_rq_map_user_iov by
> allowing it to build multiple bios for a request. This functionality
> used to exist for the non-vectored blk_rq_map_user in the past, and
> this patch reuses the existing functionality for it on the unmap side,
> which stuck around. Thanks to the iov_iter API supporting multiple
> bios is fairly trivial, as we can just iterate the iov until we've
> consumed the whole iov_iter.
>
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> Reported-by: Jeff Lien <Jeff.Lien at hgst.com>
> Tested-by: Jeff Lien <Jeff.Lien at hgst.com>
This looks good too, though I think patch 2/5 in this series on its
own should have fixed the transfer issues for NVMe. AFAICT, the only
reason the iterator couldn't be fully copied into a single bio is if
blk_add_pc_page already hit a queue limit, and blk_rq_append_bio would
fail for the same reason.
Reviewed-by: Keith Busch <keith.busch at intel.com>
next prev parent reply other threads:[~2016-03-02 19:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 17:07 [for 4.5] fix regression for large NVMe user command Christoph Hellwig
2016-03-02 17:07 ` [PATCH 1/5] nvme: also set BLK_MQ_F_SHOULD_MERGE for the admin queue Christoph Hellwig
2016-03-02 17:35 ` Sagi Grimberg
2016-03-02 18:15 ` Keith Busch
2016-03-02 21:17 ` Christoph Hellwig
2016-03-02 23:55 ` Ming Lei
[not found] ` <20160303084609.GA14051@lst.de>
2016-03-03 11:24 ` blk-mq merge flags Ming Lei
2016-03-03 11:59 ` Christoph Hellwig
2016-03-15 16:08 ` Christoph Hellwig
2016-03-15 22:13 ` Jens Axboe
2016-03-02 20:01 ` [PATCH 1/5] nvme: also set BLK_MQ_F_SHOULD_MERGE for the admin queue Jens Axboe
2016-03-02 17:07 ` [PATCH 2/5] nvme: set queue limits " Christoph Hellwig
2016-03-02 19:10 ` Keith Busch
2016-03-02 17:07 ` [PATCH 3/5] nvme: fix max_segments integer truncation Christoph Hellwig
2016-03-02 18:27 ` Keith Busch
2016-03-02 17:07 ` [PATCH 4/5] block: fix blk_rq_get_max_sectors for driver private requests Christoph Hellwig
2016-03-02 19:17 ` Keith Busch
2016-03-02 21:18 ` Christoph Hellwig
2016-03-02 22:16 ` Jens Axboe
2016-03-02 17:07 ` [PATCH 5/5] block: support large requests in blk_rq_map_user_iov Christoph Hellwig
2016-03-02 19:34 ` Keith Busch [this message]
2016-03-02 21:20 ` Christoph Hellwig
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