Re: [RFC PATCH 4/4] Directory listing support for union mounted directories.

[Christoph Hellwig]

On Wed, Jun 20, 2007 at 10:22:28AM -0400, Trond Myklebust wrote:
> No it shouldn't. The struct file contains other stateful information
> from the open() call (such as authentication info) that needs to be
> passed into readdir.

Which is exactly that problem this tries to solve.  Once you have
union mounts you'll have a single open file descriptor for multiple
actual directories.   Beause of that you can't simply attach to the
state to the struct file but have to keep it in a different way.

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