Re: [patch 0/9] extended fdinfo via procfs series, v7

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On Thu, Aug 23, 2012 at 02:43:23PM +0400, Cyrill Gorcunov wrote:
> Hi guys,
> 
> here is updated version of the fdinfo via procfs series,
> the changes from previous one are the following
> 
>  - fhandle is carried inside inotify mark but this feature
>    is CONFIG dependent to not bloat the kernel for users
>    who don't need it

As Al points out, this doesn't help much: if this feature is something a
distro will want to provide, then in practice all their users are
eventually going to end up with it turned on.

Could you quantify the cost somehow?

I wonder if you could get away with something less than MAX_HANDLE_SIZE?
128 bytes is the maximum allowable by NFSv4.  In practice I don't think
any of our filesystems need more than 40 or so right now.

--b.

> 
>  - a small fix in exportfs code to prevent nil dereference
> 
> the comments would be appreciated.
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