Re: [PATCH 30/32] vfs: Allow cloning of a mount tree with open(O_PATH|O_CLONE_MOUNT) [ver #8]

On Thu, May 31, 2018 at 11:26:54PM -0700, Christoph Hellwig wrote:

On Fri, May 25, 2018 at 01:08:38AM +0100, David Howells wrote:

quoted

Make it possible to clone a mount tree with a new pair of open flags that
are used in conjunction with O_PATH:

 (1) O_CLONE_MOUNT - Clone the mount or mount tree at the path.

 (2) O_NON_RECURSIVE - Don't clone recursively.

Err.  I don't think we should use up two O_* flags for something
only useful for your new mount API.  Don't we have a better place
to for these flags?

Instead of overloading this on open having a specific syscalls just
seems like a much saner idea.

It's not just mount API; these can be used independently of that.
Think of the uses where you pass those to ...at() and you'll see
a bunch of applications of that thing.