From: Cyrill Gorcunov <gorcunov@gmail.com>
To: David Herrmann <dh.herrmann@gmail.com>,
Pavel Emelyanov <xemul@parallels.com>
Cc: linux-kernel@vger.kernel.org, "Hugh Dickins" <hughd@google.com>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Matthew Wilcox" <matthew@wil.cx>,
"Karol Lewandowski" <k.lewandowsk@samsung.com>,
"Kay Sievers" <kay@vrfy.org>, "Daniel Mack" <zonque@gmail.com>,
"Lennart Poettering" <lennart@poettering.net>,
"Kristian Høgsberg" <krh@bitplanet.net>,
john.stultz@linaro.org, "Greg Kroah-Hartman" <greg@kroah.com>,
"Tejun Heo" <tj@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, "Andrew Morton" <akpm@linux-foundation.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Ryan Lortie" <desrt@desrt.ca>,
"Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Subject: Re: [PATCH 3/6] shm: add memfd_create() syscall
Date: Thu, 20 Mar 2014 12:47:48 +0400 [thread overview]
Message-ID: <20140320084748.GK1728@moon> (raw)
In-Reply-To: <1395256011-2423-4-git-send-email-dh.herrmann@gmail.com>
On Wed, Mar 19, 2014 at 08:06:48PM +0100, David Herrmann wrote:
> memfd_create() is similar to mmap(MAP_ANON), but returns a file-descriptor
> that you can pass to mmap(). It explicitly allows sealing and
> avoids any connection to user-visible mount-points. Thus, it's not
> subject to quotas on mounted file-systems, but can be used like
> malloc()'ed memory, but with a file-descriptor to it.
>
> memfd_create() does not create a front-FD, but instead returns the raw
> shmem file, so calls like ftruncate() can be used. Also calls like fstat()
> will return proper information and mark the file as regular file. Sealing
> is explicitly supported on memfds.
>
> Compared to O_TMPFILE, it does not require a tmpfs mount-point and is not
> subject to quotas and alike.
If I'm not mistaken in something obvious, this looks similar to /proc/pid/map_files
feature, Pavel?
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next prev parent reply other threads:[~2014-03-20 8:47 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-19 19:06 [PATCH 0/6] File Sealing & memfd_create() David Herrmann
2014-03-19 19:06 ` [PATCH 1/6] fs: fix i_writecount on shmem and friends David Herrmann
2014-03-19 19:06 ` [PATCH 2/6] shm: add sealing API David Herrmann
2014-03-19 19:06 ` [PATCH 3/6] shm: add memfd_create() syscall David Herrmann
2014-03-20 8:47 ` Cyrill Gorcunov [this message]
2014-03-20 9:01 ` Pavel Emelyanov
2014-03-20 11:29 ` David Herrmann
2014-03-20 11:50 ` Pavel Emelyanov
2014-03-20 19:22 ` John Stultz
2014-04-02 13:38 ` Konstantin Khlebnikov
2014-04-02 14:18 ` David Herrmann
2014-04-02 14:52 ` Konstantin Khlebnikov
2014-04-10 19:07 ` Andy Lutomirski
2014-03-19 19:06 ` [PATCH 4/6] selftests: add memfd_create() + sealing tests David Herrmann
2014-03-19 19:06 ` [PATCH man-pages 5/6] fcntl.2: document SHMEM_SET/GET_SEALS commands David Herrmann
2014-03-19 19:06 ` [PATCH man-pages 6/6] memfd_create.2: add memfd_create() man-page David Herrmann
2014-03-20 2:55 ` [PATCH 0/6] File Sealing & memfd_create() Greg Kroah-Hartman
2014-03-20 3:49 ` Linus Torvalds
2014-03-20 8:07 ` David Herrmann
2014-03-20 14:41 ` One Thousand Gnomes
2014-03-20 15:12 ` David Herrmann
2014-03-20 15:26 ` One Thousand Gnomes
2014-03-20 15:32 ` tytso
2014-03-20 15:39 ` One Thousand Gnomes
2014-03-20 15:48 ` David Herrmann
2014-03-20 16:38 ` tytso
2014-04-10 19:14 ` Andy Lutomirski
2014-04-10 20:32 ` Theodore Ts'o
2014-04-10 20:37 ` Andy Lutomirski
2014-04-10 20:49 ` David Herrmann
2014-04-10 21:16 ` Andy Lutomirski
2014-04-10 22:57 ` David Herrmann
2014-04-10 23:05 ` Andy Lutomirski
2014-04-10 23:16 ` David Herrmann
2014-04-10 23:32 ` Andy Lutomirski
2014-04-20 15:03 ` Pavel Machek
2014-06-17 9:48 ` Florian Weimer
2014-06-17 16:21 ` Andy Lutomirski
2014-04-10 14:45 ` Colin Walters
2014-04-10 19:15 ` Andy Lutomirski
2014-04-10 19:45 ` Colin Walters
2014-04-11 6:09 ` Alex Elsayed
2014-04-08 13:00 ` Florian Weimer
2014-04-09 21:31 ` David Herrmann
2014-04-22 9:10 ` Florian Weimer
2014-04-22 11:55 ` David Herrmann
2014-04-22 12:44 ` Florian Weimer
2014-04-22 12:55 ` David Herrmann
2014-04-10 19:17 ` Andy Lutomirski
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