Re: [PATCH v6 2/5] fs, xfs: introduce S_IOMAP_SEALED

[Christoph Hellwig]

I'm still very unhappy about the get/set flag state.  What is the
reason you can't use/extend leases? (take a look at the fcntl
man page and look for Leases).  A variant of the concept is what
the pNFS block server uses.