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Date: Thu, 13 Jun 2019 14:18:34 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Dan Williams <dan.j.williams@...el.com> Cc: Ira Weiny <ira.weiny@...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 <linux-xfs@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, John Hubbard <jhubbard@...dia.com>, Jérôme Glisse <jglisse@...hat.com>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-nvdimm <linux-nvdimm@...ts.01.org>, linux-ext4 <linux-ext4@...r.kernel.org>, Linux MM <linux-mm@...ck.org> Subject: Re: [PATCH RFC 00/10] RDMA/FS DAX truncate proposal On Thu, Jun 13, 2019 at 09:25:54AM -0700, Dan Williams wrote: > On Thu, Jun 13, 2019 at 8:14 AM Jason Gunthorpe <jgg@...pe.ca> wrote: > > > > On Wed, Jun 12, 2019 at 06:14:46PM -0700, Dan Williams wrote: > > > > Effectively, we would need a way for an admin to close a specific file > > > > descriptor (or set of fds) which point to that file. AFAIK there is no way to > > > > do that at all, is there? > > > > > > Even if there were that gets back to my other question, does RDMA > > > teardown happen at close(fd), or at final fput() of the 'struct > > > file'? > > > > AFAIK there is no kernel side driver hook for close(fd). > > > > rdma uses a normal chardev so it's lifetime is linked to the file_ops > > release, which is called on last fput. So all the mmaps, all the dups, > > everything must go before it releases its resources. > > Oh, I must have missed where this conversation started talking about > the driver-device fd. In the first paragraph above where Ira is musing about 'close a specific file', he is talking about the driver-device fd. Ie unilaterally closing /dev/uverbs as a punishment for an application that used leases wrong: ie that released its lease with the RDMA is still ongoing. Jason
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