lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 13 Jun 2019 09:25:54 -0700 From: Dan Williams <dan.j.williams@...el.com> To: Jason Gunthorpe <jgg@...pe.ca> 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 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. I thought we were talking about the close / release of the target file that is MAP_SHARED for the memory registration. A release of the driver fd is orthogonal to coordinating / signalling actions relative to the leased file.
Powered by blists - more mailing lists