All of lore.kernel.org
 help / color / mirror / Atom feed
From: Liu Bo <bo.li.liu@oracle.com>
To: dsterba@suse.cz
Cc: linux-btrfs@vger.kernel.org, Chris Mason <clm@fb.com>,
	Jan Kara <jack@suse.cz>
Subject: Re: [PATCH 2/6] Btrfs: set single device limit for dax usecase
Date: Thu, 8 Dec 2016 07:19:00 -0800	[thread overview]
Message-ID: <20161208151900.GA20111@localhost.localdomain> (raw)
In-Reply-To: <20161208133559.GE12522@suse.cz>

On Thu, Dec 08, 2016 at 02:35:59PM +0100, David Sterba wrote:
> On Wed, Dec 07, 2016 at 01:45:06PM -0800, Liu Bo wrote:
> > Dax on btrfs is not ready for multiple device.
> 
> How about DUP? Technically it's not multi-device but still stores
> multiple copies, so I don't know if the implementation is ok with that.

Good question.

For this patch set, meta DUP is OK while data DUP is not, the main
obstacle is that the actual copy-to-device operation happens in iomap
code (iomap_dax_actor), not inside filesystem itself, and it only takes
one <device, blocknum> pair to copy to device.

Thanks,

-liubo

  reply	other threads:[~2016-12-08 15:19 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-07 21:45 [PATCH 0/6] btrfs dax IO Liu Bo
2016-12-07 21:45 ` [PATCH 1/6] Btrfs: add mount option for dax Liu Bo
2016-12-08  2:44   ` kbuild test robot
2016-12-09  4:47   ` Dave Chinner
2016-12-09 18:41     ` Liu Bo
2016-12-09 21:58       ` Dave Chinner
2016-12-07 21:45 ` [PATCH 2/6] Btrfs: set single device limit for dax usecase Liu Bo
2016-12-08 13:35   ` David Sterba
2016-12-08 15:19     ` Liu Bo [this message]
2016-12-07 21:45 ` [PATCH 3/6] Btrfs: refactor btrfs_file_write_iter Liu Bo
2016-12-08  0:44   ` kbuild test robot
2016-12-07 21:45 ` [PATCH 4/6] Btrfs: add DAX support for nocow btrfs Liu Bo
2016-12-07 22:15   ` Chris Mason
2016-12-07 22:51     ` Liu Bo
2016-12-08 10:47     ` Jan Kara
2016-12-08 16:45       ` Liu Bo
2016-12-09 12:31         ` Jan Kara
2016-12-09 18:38           ` Liu Bo
2016-12-08  1:16   ` kbuild test robot
2016-12-08  2:19     ` Janos Toth F.
2016-12-08  2:30   ` kbuild test robot
2016-12-09  5:13   ` Dave Chinner
2016-12-09 14:23     ` Chris Mason
2016-12-07 21:45 ` [PATCH 5/6] Btrfs: add mmap_sem to avoid race between page faults and truncate/hole_punch Liu Bo
2016-12-07 21:45 ` [PATCH 6/6] Btrfs: add tracepoint for btrfs_get_blocks_dax_fault Liu Bo

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=20161208151900.GA20111@localhost.localdomain \
    --to=bo.li.liu@oracle.com \
    --cc=clm@fb.com \
    --cc=dsterba@suse.cz \
    --cc=jack@suse.cz \
    --cc=linux-btrfs@vger.kernel.org \
    /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
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.