From: Dan Williams <dan.j.williams@intel.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jan Kara <jack@suse.cz>, linux-nvdimm <linux-nvdimm@lists.01.org>,
Dave Chinner <david@fromorbit.com>,
linux-xfs@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: [RFC PATCH 0/7] dax, ext4: Synchronous page faults
Date: Sun, 13 Aug 2017 10:08:41 -0700 [thread overview]
Message-ID: <CAA9_cmd=fVP5n=Z=QThZEbCnWptNv2Amv6W7ujGG+O7VtXPs6g@mail.gmail.com> (raw)
In-Reply-To: <20170813092556.GA19019@infradead.org>
On Sun, Aug 13, 2017 at 2:25 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Sat, Aug 12, 2017 at 07:44:14PM -0700, Dan Williams wrote:
>> How about MAP_SYNC == (MAP_SHARED|MAP_PRIVATE)? On older kernels that
>> should get -EINVAL, and on new kernels it means SYNC+SHARED.
>
> Cute trick, but I'd hate to waster it just for our little flag.
>
> How about:
>
> #define __MAP_VALIDATE MAP_SHARED|MAP_PRIVATE
> #define MAP_SYNC 0x??? | __MAP_VALIDATE
>
> so that we can reuse that trick for any new flag?
Yes, even better. I think that effectively kicks the need for mmap3()
down the road a bit.
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WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: linux-xfs@vger.kernel.org, Jan Kara <jack@suse.cz>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Dave Chinner <david@fromorbit.com>,
Andy Lutomirski <luto@kernel.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: [RFC PATCH 0/7] dax, ext4: Synchronous page faults
Date: Sun, 13 Aug 2017 10:08:41 -0700 [thread overview]
Message-ID: <CAA9_cmd=fVP5n=Z=QThZEbCnWptNv2Amv6W7ujGG+O7VtXPs6g@mail.gmail.com> (raw)
In-Reply-To: <20170813092556.GA19019@infradead.org>
On Sun, Aug 13, 2017 at 2:25 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Sat, Aug 12, 2017 at 07:44:14PM -0700, Dan Williams wrote:
>> How about MAP_SYNC == (MAP_SHARED|MAP_PRIVATE)? On older kernels that
>> should get -EINVAL, and on new kernels it means SYNC+SHARED.
>
> Cute trick, but I'd hate to waster it just for our little flag.
>
> How about:
>
> #define __MAP_VALIDATE MAP_SHARED|MAP_PRIVATE
> #define MAP_SYNC 0x??? | __MAP_VALIDATE
>
> so that we can reuse that trick for any new flag?
Yes, even better. I think that effectively kicks the need for mmap3()
down the road a bit.
next prev parent reply other threads:[~2017-08-13 17:06 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-27 13:12 [RFC PATCH 0/7] dax, ext4: Synchronous page faults Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` [PATCH 1/7] mm: Remove VM_FAULT_HWPOISON_LARGE_MASK Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 21:57 ` Ross Zwisler
2017-07-27 21:57 ` Ross Zwisler
2017-07-27 21:57 ` Ross Zwisler
2017-08-01 10:52 ` Christoph Hellwig
2017-08-01 10:52 ` Christoph Hellwig
2017-08-01 10:52 ` Christoph Hellwig
2017-07-27 13:12 ` [PATCH 2/7] dax: Add sync argument to dax_iomap_fault() Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 22:06 ` Ross Zwisler
2017-07-27 22:06 ` Ross Zwisler
2017-07-27 22:06 ` Ross Zwisler
2017-07-28 9:40 ` Jan Kara
2017-07-28 9:40 ` Jan Kara
2017-07-27 13:12 ` [PATCH 3/7] dax: Simplify arguments of dax_insert_mapping() Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 22:09 ` Ross Zwisler
2017-07-27 22:09 ` Ross Zwisler
2017-07-27 22:09 ` Ross Zwisler
2017-08-01 10:54 ` Christoph Hellwig
2017-08-01 10:54 ` Christoph Hellwig
2017-08-01 10:54 ` Christoph Hellwig
2017-07-27 13:12 ` [PATCH 4/7] dax: Make dax_insert_mapping() return VM_FAULT_ state Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 22:22 ` Ross Zwisler
2017-07-27 22:22 ` Ross Zwisler
2017-07-28 9:43 ` Jan Kara
2017-07-28 9:43 ` Jan Kara
2017-07-27 13:12 ` [PATCH 5/7] dax, iomap: Add support for synchronous faults Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 22:42 ` Ross Zwisler
2017-07-27 22:42 ` Ross Zwisler
2017-08-01 10:56 ` Christoph Hellwig
2017-08-01 10:56 ` Christoph Hellwig
2017-08-01 10:56 ` Christoph Hellwig
2017-07-27 13:12 ` [PATCH 6/7] dax: Implement dax_pfn_mkwrite() Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 22:53 ` Ross Zwisler
2017-07-27 22:53 ` Ross Zwisler
2017-07-27 22:53 ` Ross Zwisler
2017-07-27 23:04 ` Ross Zwisler
2017-07-27 23:04 ` Ross Zwisler
2017-07-28 10:37 ` Jan Kara
2017-07-28 10:37 ` Jan Kara
2017-07-28 10:37 ` Jan Kara
2017-07-27 13:12 ` [PATCH 7/7] ext4: Support for synchronous DAX faults Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 13:12 ` Jan Kara
2017-07-27 22:57 ` Ross Zwisler
2017-07-27 22:57 ` Ross Zwisler
2017-07-27 14:09 ` [RFC PATCH 0/7] dax, ext4: Synchronous page faults Jeff Moyer
2017-07-27 14:09 ` Jeff Moyer
2017-07-27 14:09 ` Jeff Moyer
2017-07-27 21:57 ` Ross Zwisler
2017-07-27 21:57 ` Ross Zwisler
2017-07-28 2:05 ` Andy Lutomirski
2017-07-28 2:05 ` Andy Lutomirski
2017-07-28 9:38 ` Jan Kara
2017-07-28 9:38 ` Jan Kara
2017-07-28 9:38 ` Jan Kara
2017-08-01 11:02 ` Christoph Hellwig
2017-08-01 11:02 ` Christoph Hellwig
2017-08-01 11:26 ` Jan Kara
2017-08-01 11:26 ` Jan Kara
2017-08-01 11:26 ` Jan Kara
2017-08-08 0:24 ` Dan Williams
2017-08-08 0:24 ` Dan Williams
2017-08-11 10:03 ` Christoph Hellwig
2017-08-11 10:03 ` Christoph Hellwig
2017-08-11 10:03 ` Christoph Hellwig
2017-08-13 2:44 ` Dan Williams
2017-08-13 2:44 ` Dan Williams
2017-08-13 2:44 ` Dan Williams
2017-08-13 9:25 ` Christoph Hellwig
2017-08-13 9:25 ` Christoph Hellwig
2017-08-13 17:08 ` Dan Williams [this message]
2017-08-13 17:08 ` Dan Williams
2017-08-14 8:30 ` Jan Kara
2017-08-14 8:30 ` Jan Kara
2017-08-14 14:04 ` Boaz Harrosh
2017-08-14 14:04 ` Boaz Harrosh
2017-08-14 16:03 ` Dan Williams
2017-08-14 16:03 ` Dan Williams
2017-08-15 9:06 ` Boaz Harrosh
2017-08-15 9:06 ` Boaz Harrosh
2017-08-15 9:44 ` Boaz Harrosh
2017-08-15 9:44 ` Boaz Harrosh
2017-08-21 19:57 ` Ross Zwisler
2017-08-21 19:57 ` Ross Zwisler
2017-08-21 19:57 ` Ross Zwisler
2017-08-17 16:08 ` Jan Kara
2017-08-17 16:08 ` Jan Kara
2017-08-01 10:52 ` Christoph Hellwig
2017-08-01 10:52 ` Christoph Hellwig
2017-08-01 10:52 ` Christoph Hellwig
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