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Date: Thu, 6 Jun 2019 16:46:52 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Ira Weiny <ira.weiny@...el.com> Cc: John Hubbard <jhubbard@...dia.com>, Dan Williams <dan.j.williams@...el.com>, Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>, Jeff Layton <jlayton@...nel.org>, Dave Chinner <david@...morbit.com>, Matthew Wilcox <willy@...radead.org>, linux-xfs@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Jérôme Glisse <jglisse@...hat.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org, linux-ext4@...r.kernel.org, linux-mm@...ck.org, linux-rdma@...r.kernel.org Subject: Re: [PATCH RFC 00/10] RDMA/FS DAX truncate proposal On Thu, Jun 06, 2019 at 10:11:58AM -0700, Ira Weiny wrote: > 2) This is a bit more subtle and something I almost delayed sending these out > for. Currently the implementation of a lease break actually removes the > lease from the file. I did not want this to happen and I was thinking of > delaying this patch set to implement something which keeps the lease around > but I figured I should get something out for comments. Jan has proposed > something along these lines and I agree with him so I'm going to ask you to > read my response to him about the details. > > > Anyway so the key here is that currently an app needs the SIGIO to retake > the lease if they want to map the file again or in parts based on usage. > For example, they may only want to map some of the file for when they are > using it and then map another part later. Without the SIGIO they would lose > their lease or would have to just take the lease for each GUP pin (which > adds overhead). Like I said I did not like this but I left it to get > something which works out. So to be clear.. Even though the lease is broken the GUP remains, the pages remain pined, and truncate/etc continues to fail? I like Jan's take on this actually.. see other email. Jason
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