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

[H. Peter Anvin]

Pavel Machek wrote:
> On Sun 2008-01-20 09:23:00, Miklos Szeredi wrote:
> > > 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

Indeed.

And this is most certainly NOT only for humans, and race conditions most 
certainly matter.

	-hpa
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