Re: [RFC PATCH] file as directory

On Wed, May 23, 2007 at 09:19:17AM +0200, Miklos Szeredi wrote:
Eh... Arbitrary limitations are fun, aren't they?

But these mounts _are_ special. There is really no point in moving or
pivoting them.

pivoting - probably true, moving... why not?

What about MNT_SLAVE stuff being set up prior to that lookup?

These mounts are not propagated. Or at least I hope so. Propagation
stuff is a bit too complicated for my poor little brain.

Er... These mounts might not be propagated, but what about a bind
over another instance of such file in master tree?

I think they should be the same superblock, same dentry. What would
be the advantage of doing otherwise?

Then you are going to have interesting time with locking in final mntput().
BTW, what about having several links to the same file? You have i_mutex
on the inode, so serialization of those is not a problem, but...

I think doing this recursively should be allowed. "Releasing last ref
cleans up the mess" should work in that case.

Releasing the last reference will lead to cascade of umounts in that
case... IOW, need to be careful with locking.
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