Re: [Lsf-pc] [1/8] readdir-plus system call - LSF/MM follow up

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On Wed, May 29, 2013 at 10:04:56AM -0400, J. Bruce Fields wrote:
> An odd exception: in the presence of "posix" acls, "ls -l" requests an
> acl for every entry, so it can decide whether or not to add a "+" after
> the mode (which indicates the presence of a non-trivial acl.) Judging
> from http://www.bestbits.at/richacl/example.html, the same is intended
> (but not yet implemented) for richacls.
> 
> Maybe if that case were common, there'd be some advantage to ls being
> able to do a readdir plus to the nfs client that the nfs client could
> translate into a single readdir to the server?
> 
> But I hope it doesn't come to that.

Having a xstat flag that a filesystem can set meaning there is no
additional security information would be way more efficient for the
common case.

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