On 03/30/2016 09:46 AM, Jens Axboe wrote:
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.
Conversion series in here now:
http://git.kernel.dk/cgit/linux-block/log/?h=wb-buf-throttle
--
Jens Axboe
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