Re: [PATCH -V14 0/11] Generic name to handle and open by handlesyscalls

[J. Bruce Fields]

On Wed, Jul 07, 2010 at 01:40:53AM -0600, Andreas Dilger wrote:
> On 2010-07-06, at 11:09, Aneesh Kumar K. V wrote:
> > On Tue, 6 Jul 2010 12:10:02 -0400, "J. Bruce Fields" <bfields@xxxxxxxxxxxx> wrote:
> >> ... I don't understand why both need to come in the same system call.
> >> Is it purely an efficiency question?  If so, why do you expect this to
> >> be significant?
> > 
> > Since we know that system wide file handle should include a file system
> > identifier and a file identifier my plan was to retrieve both in the
> > same syscall.
> 
> Won't having it be in a separate system call be racy w.r.t. doing the pathname lookup twice?

It'll be rare that a server will want to *just* get a filehandle;
normally it will at least want to get some attributes at the same time.

So I think it will always need to open the file first and then do the
rest of the operations on the returned filehandle.

--b.
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