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Re: [dm-devel] [PATCH 1/3] block: Add blk_queue_copy_limits()
- From: "Martin K. Petersen" <martin petersen oracle com>
- To: device-mapper development <dm-devel redhat com>
- Cc: Jens Axboe <jens axboe oracle com>, Alasdair G Kergon <agk redhat com>, Mike Snitzer <snitzer redhat com>, "Martin K. Petersen" <martin petersen oracle com>, linux-kernel vger kernel org
- Subject: Re: [dm-devel] [PATCH 1/3] block: Add blk_queue_copy_limits()
- Date: Sun, 20 Sep 2009 17:00:24 -0400
>>>>> "Jun'ichi" == Jun'ichi Nomura <j-nomura ce jp nec com> writes:
Jun'ichi> Umm, with this, BLK_DEF_MAX_SECTORS becomes upper bound of
Jun'ichi> max_hw_sectors and the values of underlying devices are not
Jun'ichi> propagated to the stacking devices.
Well, max_sectors is already bounded by this. max_hw_sectors only
really matters for PC commands, so I'm not sure it's a big deal for
DM. But I guess we could set the default max_hw_sectors to -1.
I'm just trying to avoid these scattered if-0-set-it-to-something-else
cases. I'd much rather have the defaults do the right thing.
--
Martin K. Petersen Oracle Linux Engineering
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