Linux-Block Archive on lore.kernel.org
 help / color / Atom feed
From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Kirill Tkhai <ktkhai@virtuozzo.com>,
	axboe@kernel.dk, bob.liu@oracle.com, agk@redhat.com,
	snitzer@redhat.com, dm-devel@redhat.com, song@kernel.org,
	tytso@mit.edu, adilger.kernel@dilger.ca,
	Chaitanya.Kulkarni@wdc.com, ming.lei@redhat.com, osandov@fb.com,
	jthumshirn@suse.de, minwoo.im.dev@gmail.com,
	damien.lemoal@wdc.com, andrea.parri@amarulasolutions.com,
	hare@suse.com, tj@kernel.org, ajay.joshi@wdc.com,
	sagi@grimberg.me, dsterba@suse.com, bvanassche@acm.org,
	dhowells@redhat.com, asml.silence@gmail.com,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 0/6] block: Introduce REQ_ALLOCATE flag for REQ_OP_WRITE_ZEROES
Date: Thu, 26 Mar 2020 10:34:42 -0400
Message-ID: <yq1lfnngp6l.fsf@oracle.com> (raw)
In-Reply-To: <20200326092935.GA6478@infradead.org> (Christoph Hellwig's message of "Thu, 26 Mar 2020 02:29:35 -0700")


Christoph,

> That's why I don't like the whole flags game very much.  I'd rather
> have REQ_OP_WRITE_ZEROES as the integrity operation that gurantees
> zeroing, and a REQ_ALLOCATE that doesn't guarantee zeroing, just some
> deterministic state of the blocks.

I just worry about the proliferation of identical merging and splitting
code throughout the block stack as we add additional single-range, no
payload operations (Verify, etc.). I prefer to enforce the semantics in
the LLD and not in the plumbing. But I won't object to a separate
REQ_OP_ALLOCATE if you find the resulting code duplication acceptable.

-- 
Martin K. Petersen	Oracle Linux Engineering

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13  7:39 Kirill Tkhai
2020-02-13  7:39 ` [PATCH v7 1/6] block: Add @flags argument to bdev_write_zeroes_sectors() Kirill Tkhai
2020-02-13  7:39 ` [PATCH v7 2/6] block: Pass op_flags into blk_queue_get_max_sectors() Kirill Tkhai
2020-02-13  7:39 ` [PATCH v7 3/6] block: Introduce blk_queue_get_max_write_zeroes_sectors() Kirill Tkhai
2020-02-13  7:39 ` [PATCH v7 4/6] block: Add support for REQ_ALLOCATE flag Kirill Tkhai
2020-02-13  7:39 ` [PATCH v7 5/6] block: Add blk_queue_max_allocate_sectors() Kirill Tkhai
2020-02-13  7:39 ` [PATCH v7 6/6] loop: Add support for REQ_ALLOCATE Kirill Tkhai
2020-02-13 18:11   ` Darrick J. Wong
2020-02-13 20:07     ` Kirill Tkhai
2020-02-13  7:55 ` [PATCH v7 0/6] block: Introduce REQ_ALLOCATE flag for REQ_OP_WRITE_ZEROES Kirill Tkhai
2020-03-06  9:11   ` Kirill Tkhai
2020-03-13 13:08     ` Kirill Tkhai
2020-03-19 10:28       ` Christoph Hellwig
2020-03-19 10:42         ` Kirill Tkhai
2020-03-19 13:03         ` Martin K. Petersen
2020-03-25 16:26           ` Darrick J. Wong
2020-03-25 16:32             ` Christoph Hellwig
2020-03-25 17:23               ` Martin K. Petersen
2020-03-26  9:29                 ` Christoph Hellwig
2020-03-26 14:34                   ` Martin K. Petersen [this message]
2020-03-26 14:45                     ` Christoph Hellwig
2020-03-26 16:48                       ` Chaitanya Kulkarni

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=yq1lfnngp6l.fsf@oracle.com \
    --to=martin.petersen@oracle.com \
    --cc=Chaitanya.Kulkarni@wdc.com \
    --cc=adilger.kernel@dilger.ca \
    --cc=agk@redhat.com \
    --cc=ajay.joshi@wdc.com \
    --cc=andrea.parri@amarulasolutions.com \
    --cc=asml.silence@gmail.com \
    --cc=axboe@kernel.dk \
    --cc=bob.liu@oracle.com \
    --cc=bvanassche@acm.org \
    --cc=damien.lemoal@wdc.com \
    --cc=darrick.wong@oracle.com \
    --cc=dhowells@redhat.com \
    --cc=dm-devel@redhat.com \
    --cc=dsterba@suse.com \
    --cc=hare@suse.com \
    --cc=hch@infradead.org \
    --cc=jthumshirn@suse.de \
    --cc=ktkhai@virtuozzo.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=ming.lei@redhat.com \
    --cc=minwoo.im.dev@gmail.com \
    --cc=osandov@fb.com \
    --cc=sagi@grimberg.me \
    --cc=snitzer@redhat.com \
    --cc=song@kernel.org \
    --cc=tj@kernel.org \
    --cc=tytso@mit.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Block Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-block/0 linux-block/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-block linux-block/ https://lore.kernel.org/linux-block \
		linux-block@vger.kernel.org
	public-inbox-index linux-block

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-block


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git