[pnfs] [PATCH 0/2] layoutrecall: more fixes

[Benny Halevy]

1. Marc Eshel correctly observed that we currently look for the layout to
return only on inodes with open state.  This patchset adds another function
that searches up all inodes as a temporary solution.
* todo: use hash table for fh lookup,
        same for delegations

2. return NFS4ERR_NOMATCHING_LAYOUT synchronously if no inode found.

Note that I exported __iget in inode.c in order to get a reference
on the inode while holding the inode lock. this should go away when
we move to the hash table