From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: NeilBrown <neilb@suse.de>
Cc: Heinz Mauelshagen <heinzm@redhat.com>,
device-mapper development <dm-devel@redhat.com>,
Shaohua Li <shli@kernel.org>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: [PATCH] dm-raid: add RAID discard support
Date: Thu, 02 Oct 2014 21:09:49 -0400 [thread overview]
Message-ID: <yq138b6hsbm.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <20141001125625.1e0d356a@notabene.brown> (NeilBrown's message of "Wed, 1 Oct 2014 12:56:25 +1000")
>>>>> "Neil" == NeilBrown <neilb@suse.de> writes:
Neil> I would really rather that discard_zeroes_data were only set on
Neil> devices where it was actually true. Then it wouldn't be my
Neil> problem any more.
Yeah. It's too late for 3.18 but I'll try to get a whitelist going for
3.19.
Neil> Here is a question: if a region has been discarded, are we
Neil> guaranteed that reads are at least stable. i.e. if I read twice
Neil> will I definitely get the same value?
If discard_zeroes_data=1, then yes.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2014-10-03 1:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-23 16:51 [PATCH] dm-raid: add RAID discard support heinzm
2014-09-23 21:52 ` Brassow Jonathan
2014-09-23 23:07 ` Martin K. Petersen
2014-09-23 23:33 ` NeilBrown
2014-09-24 2:20 ` Martin K. Petersen
2014-09-24 4:05 ` Brassow Jonathan
2014-09-24 4:21 ` NeilBrown
2014-09-24 4:35 ` Brassow Jonathan
2014-09-24 11:02 ` Heinz Mauelshagen
2014-10-01 2:56 ` NeilBrown
2014-10-01 11:13 ` Heinz Mauelshagen
2014-10-03 1:12 ` Martin K. Petersen
2014-10-01 13:32 ` Mike Snitzer
2014-10-01 23:34 ` NeilBrown
2014-10-02 1:31 ` Mike Snitzer
2014-10-02 2:00 ` NeilBrown
2014-10-02 4:04 ` [dm-devel] " NeilBrown
2014-10-02 13:52 ` Mike Snitzer
2014-10-02 18:00 ` Mike Snitzer
2014-10-03 1:14 ` [dm-devel] " Martin K. Petersen
2014-10-01 16:00 ` [PATCH] " Andrey Kuzmin
2014-10-01 23:15 ` NeilBrown
2014-10-01 18:57 ` Brassow Jonathan
2014-10-01 23:18 ` NeilBrown
2014-10-03 1:09 ` Martin K. Petersen [this message]
2014-09-24 14:21 ` Christoph Hellwig
2014-09-24 14:38 ` Heinz Mauelshagen
2014-09-24 15:11 ` Martin K. Petersen
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=yq138b6hsbm.fsf@sermon.lab.mkp.net \
--to=martin.petersen@oracle.com \
--cc=dm-devel@redhat.com \
--cc=heinzm@redhat.com \
--cc=neilb@suse.de \
--cc=shli@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.