[PATCH] [RFC] xfs: initialise attr fork on inode create

[Christoph Hellwig]

Btw, while looking at the code before replying to Casey I noticed
something else in this area of code which we should probably fix
if we touch all this.  We are really supposed to create the ACLs
and security labels atomically with the actual inode creation.  And
I think we have all the infrastructure to do this without too much
pain now for ACLs.  Security labels with the weird
security_inode_init_security interface might be a little harder but
not impossible.

And I suspect security_inode_init_security might be right thing
to reuse for the helper to figure out what attrs would be set.  If
security_inode_init_security with an idempotent callback is
idempotent itself we might be able to use it directly, but all the
weird hooking makes it rather hard to read.