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From: Ming Lei <ming.lei@redhat.com>
To: NeilBrown <neilb@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, Ming Lei <tom.leiming@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/13] block: don't check for BIO_MAX_PAGES in blk_bio_segment_split()
Date: Tue, 2 May 2017 18:22:24 +0800	[thread overview]
Message-ID: <20170502102223.GB1803@ming.t460p> (raw)
In-Reply-To: <149369654638.5146.3067734913419940612.stgit@noble>

On Tue, May 02, 2017 at 01:42:26PM +1000, NeilBrown wrote:
> blk_bio_segment_split() makes sure bios have no more than
> BIO_MAX_PAGES entries in the bi_io_vec.
> This was done because bio_clone_bioset() (when given a
> mempool bioset) could not handle larger io_vecs.
> 
> No driver uses bio_clone_bioset() any more, they all
> use bio_clone_fast() if anything, and bio_clone_fast()
> doesn't clone the bi_io_vec.

Maybe in future, some drivers still may try to use 
bio_clone_bioset() again, I suggest to add some comments
on bio_clone_bioset() to make this usage explicitly. Also
better to trigger a warning if a big src bio is passed to
bio_clone_bioset().

Thanks,
Ming

  parent reply	other threads:[~2017-05-02 10:22 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-02  3:42 [PATCH 00/13] block: assorted cleanup for bio splitting and cloning NeilBrown
2017-05-02  3:42 ` [PATCH 03/13] blk: make the bioset rescue_workqueue optional NeilBrown
2017-05-02  8:14   ` Christoph Hellwig
2017-05-02 11:00   ` Ming Lei
2017-05-02 22:10     ` NeilBrown
2017-05-02 22:34   ` [PATCH 03/13 V2] " NeilBrown
2017-05-03  3:24     ` Ming Lei
2017-05-02  3:42 ` [PATCH 02/13] blk: replace bioset_create_nobvec() with a flags arg to bioset_create() NeilBrown
2017-05-02  8:06   ` Christoph Hellwig
2017-05-02 21:47     ` NeilBrown
2017-05-02  9:40   ` Ming Lei
2017-05-02  3:42 ` [PATCH 01/13] blk: remove bio_set arg from blk_queue_split() NeilBrown
2017-05-02 10:44   ` javigon
2017-05-02  3:42 ` [PATCH 05/13] block: Improvements to bounce-buffer handling NeilBrown
2017-05-02  8:13   ` Christoph Hellwig
2017-05-02 11:56   ` Ming Lei
2017-05-02  3:42 ` [PATCH 04/13] blk: use non-rescuing bioset for q->bio_split NeilBrown
2017-05-02 11:54   ` Ming Lei
2017-05-02 23:21   ` [PATCH 04/13 V2] " NeilBrown
2017-05-02  3:42 ` [PATCH 09/13] lightnvm/pblk-read: use bio_clone_fast() NeilBrown
2017-05-02  8:15   ` Christoph Hellwig
2017-05-02 11:22   ` Javier González
2017-05-02 21:51     ` NeilBrown
2017-05-03  6:42       ` Javier González
2017-05-02  3:42 ` [PATCH 10/13] xen-blkfront: remove bio splitting NeilBrown
2017-05-02  8:15   ` Christoph Hellwig
2017-05-02  3:42 ` [PATCH 07/13] drbd: use bio_clone_fast() instead of bio_clone() NeilBrown
2017-05-02 23:20   ` [PATCH 07/13 V2] " NeilBrown
2017-05-02  3:42 ` [PATCH 06/13] rbd: " NeilBrown
2017-05-02  3:42 ` [PATCH 08/13] pktcdvd: " NeilBrown
2017-05-02  3:42 ` [PATCH 13/13] block: don't check for BIO_MAX_PAGES in blk_bio_segment_split() NeilBrown
2017-05-02  8:15   ` Christoph Hellwig
2017-05-02 10:22   ` Ming Lei [this message]
2017-05-02 22:54     ` NeilBrown
2017-05-02 23:50       ` Ming Lei
2017-05-02  3:42 ` [PATCH 11/13] bcache: use kmalloc to allocate bio in bch_data_verify() NeilBrown
2017-05-02  3:42 ` [PATCH 12/13] block: remove bio_clone() and all references NeilBrown
2017-05-11  0:58 ` [PATCH 00/13] block: assorted cleanup for bio splitting and cloning NeilBrown
2017-06-16  5:54   ` NeilBrown
2017-06-16  6:42     ` Christoph Hellwig
2017-06-16  7:30       ` NeilBrown
2017-06-16  7:34         ` Christoph Hellwig
2017-06-16 20:45           ` Jens Axboe
2017-06-18  4:40             ` NeilBrown
2017-06-18  4:40             ` NeilBrown
2017-06-18  4:38 NeilBrown
2017-06-18  4:38 ` [PATCH 13/13] block: don't check for BIO_MAX_PAGES in blk_bio_segment_split() NeilBrown

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