Messages in this thread | | | Subject | Re: [PATCH 5/9] block: add ability to flag write back caching on a device | From | Jens Axboe <> | Date | Wed, 30 Mar 2016 09:46:32 -0600 |
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On 03/30/2016 09:42 AM, Christoph Hellwig wrote: > On Wed, Mar 30, 2016 at 09:07:53AM -0600, Jens Axboe wrote: >> Add an internal helper and flag for setting whether a queue has >> write back caching, or write through (or none). Add a sysfs file >> to show this as well, and make it changeable from user space. > > As per previous discussion: I don't really care about the way how we > tell the block layer we have a writeback cache, but a NAK to having > each driver call two interfaces to convey the same information. > > Please just look at q->flush_flag & REQ_FLUSH for now, and then > improvem the interface if you don't like it (I don't particularly like > it, but not to the point that I'm motivated enough to fix it :))
That's fine, I don't mind making that change, just didn't do it for this version. I prefer if we change the cache flagging to be the primary way to signal it, it's more intuitive than REQ_FLUSH.
It'll be in the next version.
-- Jens Axboe
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