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Re: [dm-devel] [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush
- From: Christoph Hellwig <hch lst de>
- To: Tejun Heo <tj kernel org>
- Cc: tytso mit edu, linux-scsi vger kernel org, jaxboe fusionio com, jack suse cz, linux-kernel vger kernel org, swhiteho redhat com, linux-raid vger kernel org, linux-ide vger kernel org, dm-devel redhat com, James Bottomley suse de, konishi ryusuke lab ntt co jp, linux-fsdevel vger kernel org, vst vlnb net, rwheeler redhat com, hch lst de, chris mason oracle com
- Subject: Re: [dm-devel] [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush
- Date: Wed, 18 Aug 2010 11:46:20 +0200
FYI: One issue with this series is that make_request based drivers
not have to access all REQ_FLUSH and REQ_FUA requests. We'll either
need to add handling to empty REQ_FLUSH requests to all of them or
figure out a way to prevent them getting sent. That is assuming they'll
simply ignore REQ_FLUSH/REQ_FUA on normal writes.
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