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Re: [dm-devel] [PATCH 4/4] Support discard if at least one underlying device supports it
- From: Alasdair G Kergon <agk redhat com>
- To: Mike Snitzer <snitzer redhat com>
- Cc: axboe kernel dk, dm-devel redhat com, dmonakhov openvz org, Mikulas Patocka <mpatocka redhat com>, linux-fsdevel vger kernel org, linux-ext4 vger kernel org
- Subject: Re: [dm-devel] [PATCH 4/4] Support discard if at least one underlying device supports it
- Date: Fri, 2 Jul 2010 21:54:20 +0100
On Fri, Jul 02, 2010 at 04:47:09PM -0400, Mike Snitzer wrote:
> If a region doesn't support the discard
> DM has no business processing anything related to the discard (barriers
> included). It is as simple as that.
Indeed - if an I/O is going to fail, discover that as early as we can, trying
to avoid the relatively-expensive barrier process whenever we reasonably can.
Alasdair
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