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From: Tejun Heo <tj@kernel.org>
To: Milan Broz <mbroz@redhat.com>
Cc: Alasdair G Kergon <agk@redhat.com>, Neil Brown <neilb@suse.de>,
	device-mapper development <dm-devel@redhat.com>,
	Jens Axboe <axboe@kernel.dk>, Tao Ma <tm@tao.ma>,
	linux-kernel@vger.kernel.org
Subject: Re: [dm-devel] [PATCH][RFC] dm: Do not open log and cow device read-write for read-only mappings
Date: Wed, 16 Feb 2011 09:39:51 +0100	[thread overview]
Message-ID: <20110216083951.GC19830@htj.dyndns.org> (raw)
In-Reply-To: <4D5AB0C5.9030304@redhat.com>

On Tue, Feb 15, 2011 at 05:58:45PM +0100, Milan Broz wrote:
> # blockdev --setrw /dev/sd[bcde]
> # mdadm -A /dev/md0 /dev/sd[bcde]
> mdadm: /dev/md0 has been started with 4 drives.
> # mdadm --stop /dev/md0
> mdadm: stopped /dev/md0
> # blockdev --setro /dev/sd[bcde]
> # mdadm -A /dev/md0 /dev/sd[bcde]
> mdadm: cannot re-read metadata from /dev/sdb - aborting
> 
> Works on 2.6.36.

Isn't failing to assemble rw array from ro devices the expected
behavior?  I think I'd want that to fail.  Neil, what do you think?

-- 
tejun

  reply	other threads:[~2011-02-16  8:40 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-13  2:02 block device read-only handling regression in 2.6.38-rc4 (bisected) Milan Broz
2011-02-13 10:58 ` [PATCH] loop: clear read-only flag in loop_clr_fd Tao Ma
2011-02-13 14:11   ` Milan Broz
2011-02-13 15:05     ` Tao Ma
2011-02-13 16:44       ` Milan Broz
2011-02-14 10:30         ` Tejun Heo
2011-02-14 11:47           ` Milan Broz
2011-02-14 13:14             ` [PATCH][RFC] dm: Do not open log and cow device read-write for read-only mappings Milan Broz
2011-02-14 14:09               ` Tejun Heo
2011-02-14 14:23                 ` Milan Broz
2011-02-14 15:44                   ` Tejun Heo
2011-02-14 23:15                     ` NeilBrown
2011-02-15  2:03                       ` [dm-devel] " Alasdair G Kergon
2011-02-15 12:17                         ` Milan Broz
2011-02-15 12:46                           ` Alasdair G Kergon
2011-02-15 15:20                             ` Tejun Heo
2011-02-15 15:46                               ` Alasdair G Kergon
2011-02-15 15:50                                 ` Tejun Heo
2011-02-15 16:05                                   ` Milan Broz
2011-02-15 16:12                                     ` Tejun Heo
2011-02-15 16:36                                       ` Milan Broz
2011-02-15 16:41                                         ` Tejun Heo
2011-02-15 16:56                                           ` Alasdair G Kergon
2011-02-16  8:46                                             ` Tejun Heo
2011-02-15 16:58                                           ` Milan Broz
2011-02-16  8:39                                             ` Tejun Heo [this message]
2011-02-15 15:16                           ` [PATCH] Return EROFS if read-only detected on block device Milan Broz
2011-02-14 14:39                 ` [dm-devel] [PATCH][RFC] dm: Do not open log and cow device read-write for read-only mappings Alasdair G Kergon
2011-02-14 14:07             ` [PATCH] loop: clear read-only flag in loop_clr_fd Tejun Heo

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