From: Mike Snitzer <snitzer@redhat.com>
To: Milan Broz <mbroz@redhat.com>
Cc: lczerner@redhat.com, dm-devel@redhat.com
Subject: Re: dm: fix discard support in dm_io
Date: Mon, 28 Nov 2011 08:59:58 -0500 [thread overview]
Message-ID: <20111128135958.GA24022@redhat.com> (raw)
In-Reply-To: <1322249289-1263-1-git-send-email-mbroz@redhat.com>
On Fri, Nov 25 2011 at 2:28pm -0500,
Milan Broz <mbroz@redhat.com> wrote:
> This patch adds support for discard request to dm_io interface.
>
> Currently dm_mirror can send REQ_DISCARD bios if running over
> discard enabled device and without support in dm_io the system
> crashes badly.
>
> BUG: unable to handle kernel paging request at 00800000
> IP: __bio_add_page.part.17+0xf5/0x1e0
> ...
> bio_add_page+0x56/0x70
> dispatch_io+0x1cf/0x240 [dm_mod]
> ? km_get_page+0x50/0x50 [dm_mod]
> ? vm_next_page+0x20/0x20 [dm_mod]
> ? mirror_flush+0x130/0x130 [dm_mirror]
> dm_io+0xdc/0x2b0 [dm_mod]
> ...
>
> Signed-off-by: Milan Broz <mbroz@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
next prev parent reply other threads:[~2011-11-28 13:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-25 19:28 [PATCH] dm: fix discard support in dm_io Milan Broz
2011-11-28 13:59 ` Mike Snitzer [this message]
2011-12-05 20:00 ` [PATCH v2] " Milan Broz
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