Messages in this thread | | | Date | Wed, 21 Oct 2015 11:33:51 -0400 | From | Mike Snitzer <> | Subject | Re: [PATCH v6 05/11] block: remove split code in blkdev_issue_{discard,write_same} |
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On Wed, Oct 21 2015 at 11:01am -0400, Ming Lin <mlin@kernel.org> wrote:
> On Wed, 2015-10-21 at 09:39 -0400, Jeff Moyer wrote: > > Christoph Hellwig <hch@infradead.org> writes: > > > > > Jens, Ming: > > > > > > are you fine with the one liner change to get back to the old I/O > > > pattern? While it looks like the cards fault I'd like to avoid this > > > annoying regression. > > > > I'm not Jens or Ming, but your patch looks fine to me, though you'll > > want to remove the MAX_BIO_SECTORS definition since it's now unused. > > It's not clear to me why the limit was lowered in the first place. > > UINT_MAX >> 9 is not power of 2 and it causes dm-thinp discard fails. > > At the lengthy discussion: > [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios > We agreed to cap discard to 2G as an interim solution for 4.3 until the > dm-thinp discard code is rewritten.
But did Jens ever commit that change to cap at 2G? I don't recall seeing it.
> Hi Mike, > > Will the dm-thinp discard rewritten ready for 4.4?
No. I'm not clear what needs changing in dm-thinp. I'll have to revisit the thread to refresh my memory.
BTW, DM thinp can easily handle discards that aren't a power-of-2 so long as the requested discard is a factor of the thinp blocksize.
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