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
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