From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-nvdimm@lists.01.org, linux-xfs@vger.kernel.org,
Jan Kara <jack@suse.cz>, Arnd Bergmann <arnd@arndb.de>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
linux-api@vger.kernel.org, Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@lst.de>,
"J. Bruce Fields" <bfields@fieldses.org>,
linux-mm@kvack.org, Jeff Moyer <jmoyer@redhat.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
linux-fsdevel@vger.kernel.org,
Jeff Layton <jlayton@poochiereds.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush
Date: Thu, 12 Oct 2017 16:23:19 +0200 [thread overview]
Message-ID: <20171012142319.GA11254@lst.de> (raw)
In-Reply-To: <150776922692.9144.16963640112710410217.stgit@dwillia2-desk3.amr.corp.intel.com>
Sorry for chiming in so late, been extremely busy lately.
>From quickly glacing over what the now finally described use case is
(which contradicts the subject btw - it's not about flushing, it's
about not removing block mapping under a MR) and the previous comments
I think that mmap is simply the wrong kind of interface for this.
What we want is support for a new kinds of userspace memory registration in the
RDMA code that uses the pnfs export interface, both getting the block (or
rather byte in this case) mapping, and also gets the FL_LAYOUT lease for the
memory registration.
That btw is exactly what I do for the pNFS RDMA layout, just in-kernel.
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next prev parent reply other threads:[~2017-10-12 14:23 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-12 0:47 [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush Dan Williams
2017-10-12 0:47 ` [PATCH v9 1/6] mm: introduce MAP_SHARED_VALIDATE, a mechanism to safely define new mmap flags Dan Williams
2017-10-12 13:51 ` Jan Kara
2017-10-12 16:32 ` Linus Torvalds
2017-10-16 7:38 ` Christoph Hellwig
2017-10-16 7:56 ` Jan Kara
2017-10-12 0:47 ` [PATCH v9 2/6] fs, mm: pass fd to ->mmap_validate() Dan Williams
2017-10-12 1:21 ` Al Viro
2017-10-12 1:28 ` Dan Williams
2017-10-12 2:17 ` Dan Williams
2017-10-12 3:44 ` Dan Williams
2017-10-12 0:47 ` [PATCH v9 3/6] fs: MAP_DIRECT core Dan Williams
2017-10-12 0:47 ` [PATCH v9 4/6] xfs: prepare xfs_break_layouts() for reuse with MAP_DIRECT Dan Williams
2017-10-12 0:47 ` [PATCH v9 5/6] fs, xfs, iomap: introduce break_layout_nowait() Dan Williams
2017-10-12 0:47 ` [PATCH v9 6/6] xfs: wire up MAP_DIRECT Dan Williams
2017-10-12 14:23 ` Christoph Hellwig [this message]
2017-10-12 17:41 ` [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush Dan Williams
2017-10-13 6:57 ` Christoph Hellwig
2017-10-13 15:14 ` Dan Williams
2017-10-13 16:38 ` Jason Gunthorpe
2017-10-13 17:01 ` Dan Williams
2017-10-13 17:31 ` Jason Gunthorpe
2017-10-13 18:22 ` Dan Williams
2017-10-14 1:57 ` Jason Gunthorpe
2017-10-16 12:02 ` Sagi Grimberg
2017-10-19 6:02 ` Jason Gunthorpe
2017-10-16 7:30 ` Christoph Hellwig
2017-10-16 7:26 ` Christoph Hellwig
2017-10-16 12:07 ` Sagi Grimberg
2017-10-16 17:43 ` Dan Williams
2017-10-16 19:44 ` Dan Williams
2017-10-17 6:46 ` Christoph Hellwig
2017-10-16 7:22 ` Christoph Hellwig
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