commit 8006bfba36d42b6976ed92979f51e5f9bef2625c
author Trond Myklebust <Trond.Myklebust@netapp.com> Fri Sep 21 14:48:04 2012 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> Fri Sep 28 16:03:16 2012 -0400
tree 83b5c3761408b6cbfef4112431ef466b5392f909
parent 579342785f7069d32e9637ef30d59c4256dcec3d

NFSv4.1: Get rid of the NFS_LAYOUT_DESTROYED state

We already have a mechanism for blocking LAYOUTGET by means of the
plh_block_lgets counter. The only "service" that NFS_LAYOUT_DESTROYED
provides at this point is to block layoutget once the layout segment
list is empty, which basically means that you have to wait until
the pnfs_layout_hdr is destroyed before you can do pNFS on that file
again.

This patch enables the reuse of the pnfs_layout_hdr if the layout
segment list is empty.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>