Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo

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To: Miklos Szeredi <miklos@...>

Cc: <hpa@...>, <akpm@...>, <linux-fsdevel@...>, <linux-kernel@...>, <util-linux-ng@...>, <linuxram@...>, <viro@...>, <hch@...>, <a.p.zijlstra@...>

Subject: Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo

Date: Wednesday, January 23, 2008 - 9:49 am

On Sun 2008-01-20 09:23:00, Miklos Szeredi wrote:
quoted text> > Miklos Szeredi wrote:
> > > - for mount ID's use IDA (from the IDR library) instead of a 32bit
> > >   counter, which could overflow
> > 
> > IDAs tend to get reused quickly, which can cause race conditions.  Any 
> > reason not to just use a 64-bit counter?
> 
> They tend to become hard to parse/compare for humans after a while.
> And all this is basically only for humans, so race conditions don't
> really matter.  Also a changed mount with a reused ID is easily
> identified by comparing the other fields.

Hmm, smart humans only compare last few digits if they don't care
about 100% reliability, and dumb software compares 64bits easily...
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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Messages in current thread:

[RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Miklos Szeredi, (Sat Jan 19, 7:05 am)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Ram Pai, (Mon Jan 21, 3:48 pm)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Miklos Szeredi, (Mon Jan 21, 5:25 pm)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Ram Pai, (Mon Jan 21, 5:53 pm)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Miklos Szeredi, (Mon Jan 21, 6:09 pm)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Serge E. Hallyn, (Tue Jan 22, 4:56 pm)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Jan Engelhardt, (Sun Jan 20, 7:20 am)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Miklos Szeredi, (Sun Jan 20, 8:20 am)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, H. Peter Anvin, (Sun Jan 20, 1:41 am)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Miklos Szeredi, (Sun Jan 20, 4:23 am)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Pavel Machek, (Wed Jan 23, 9:49 am)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, H. Peter Anvin, (Wed Jan 23, 3:02 pm)

Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo, Miklos Szeredi, (Wed Jan 23, 3:32 pm)


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Re: [RFC][PATCH] VFS: create /proc/<pid>/mountinfo

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