Re: [PATCH 5/7] FUSE: implement ioctl support

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From: Miklos Szeredi <miklos@...>

To: <hpa@...>

Cc: <miklos@...>, <tj@...>, <fuse-devel@...>, <greg@...>, <linux-kernel@...>

Subject: Re: [PATCH 5/7] FUSE: implement ioctl support

Date: Thursday, August 28, 2008 - 4:55 pm

On Thu, 28 Aug 2008, H. Peter Anvin wrote:

quoted text

> This is *hard* to get right, and we screw this up in the kernel with
> painful regularity. The throught of having user-space processes, which
> don't have access to the kernel locking primitives and functions like
> copy_from_user() dealing with this stuff scares me crazy.

What issues exactly are you thinking of?

> That is why I'm suggesting using an in-kernel linearizer.

Lots of complexity, ugh... Even Tejun's current scheme is better IMO.

Miklos

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Messages in current thread:

[PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Aug 28, 1:40 pm)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Tue Oct 14, 4:21 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Tue Oct 14, 5:37 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 2:26 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 7:47 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 7:54 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 7:58 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 8:34 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 9:23 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 9:42 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 10:29 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 10:48 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 11:10 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 11:52 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Mon Nov 17, 5:17 am)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Miklos Szeredi, (Mon Nov 17, 6:16 am)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Tejun Heo, (Mon Nov 17, 11:32 pm)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Miklos Szeredi, (Tue Nov 18, 5:33 am)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Tejun Heo, (Tue Nov 18, 6:30 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 12:00 pm)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Wed Nov 12, 4:41 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 2:06 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 7:19 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 7:29 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Nov 13, 7:57 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 8:14 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Wed Nov 12, 6:00 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Nov 13, 1:54 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Christoph Hellwig, (Wed Nov 12, 5:14 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Wed Nov 12, 5:30 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Wed Nov 12, 5:36 am)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Mike Hommey, (Wed Nov 12, 5:43 am)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Szabolcs Szakacsits, (Tue Oct 14, 8:16 am)

Re: [fuse-devel] [PATCHSET] FUSE: extend FUSE to support mor..., Miklos Szeredi, (Tue Oct 14, 8:43 am)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Miklos Szeredi, (Thu Aug 28, 2:20 pm)

Re: [PATCHSET] FUSE: extend FUSE to support more operations, Tejun Heo, (Thu Aug 28, 2:23 pm)

[PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 1:41 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, H. Peter Anvin, (Thu Aug 28, 2:20 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 2:28 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, H. Peter Anvin, (Thu Aug 28, 3:08 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Thu Aug 28, 3:18 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, H. Peter Anvin, (Thu Aug 28, 4:21 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Thu Aug 28, 4:55 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, H. Peter Anvin, (Thu Aug 28, 5:27 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Fri Aug 29, 3:32 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Greg KH, (Thu Aug 28, 1:51 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 1:59 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 2:02 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Greg KH, (Thu Aug 28, 2:14 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 2:25 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 2:01 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Thu Aug 28, 2:13 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 2:17 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Thu Aug 28, 2:23 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 2:34 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Alan Cox, (Thu Aug 28, 4:48 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Thu Aug 28, 3:25 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 3:42 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Thu Aug 28, 4:02 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Thu Aug 28, 10:19 pm)

Re: [fuse-devel] [PATCH 5/7] FUSE: implement ioctl support, Roger Willcocks, (Fri Aug 29, 7:31 am)

Re: [fuse-devel] [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Fri Aug 29, 7:54 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Fri Aug 29, 3:59 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Fri Aug 29, 4:12 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Fri Aug 29, 4:29 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Fri Aug 29, 5:03 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Eric W. Biederman, (Fri Aug 29, 3:17 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Miklos Szeredi, (Mon Sep 1, 7:57 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Mon Sep 1, 8:03 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Eric W. Biederman, (Wed Sep 3, 10:32 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Wed Sep 3, 10:40 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Eric W. Biederman, (Wed Sep 3, 5:51 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Wed Sep 3, 8:09 pm)

Re: [PATCH 5/7] FUSE: implement ioctl support, Tejun Heo, (Sat Aug 30, 7:40 am)

Re: [PATCH 5/7] FUSE: implement ioctl support, Arnd Bergmann, (Fri Aug 29, 3:47 pm)

[PATCH 7/7] FUSE: implement poll support, Tejun Heo, (Thu Aug 28, 1:41 pm)

[PATCH 6/7] FUSE: implement unsolicited notification, Tejun Heo, (Thu Aug 28, 1:41 pm)

[PATCH 4/7] FUSE: implement direct lseek support, Tejun Heo, (Thu Aug 28, 1:41 pm)

[PATCH 1/7] FUSE: add include protectors, Tejun Heo, (Thu Aug 28, 1:40 pm)

[PATCH 3/7] FUSE: implement nonseekable open, Tejun Heo, (Thu Aug 28, 1:40 pm)

[PATCH 2/7] FUSE: pass nonblock flag to client, Tejun Heo, (Thu Aug 28, 1:40 pm)

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