nfsd fixes for 4.15

Please pull nfsd fixes for 4.15 from:

git://linux-nfs.org/~bfields/linux.git tags/nfsd-4.15-1

I screwed up my merge window pull request; I only sent half of what I meant to.

There were no new features, just bugfixes of various importance and some very minor cleanup, so I think it's all still appropriate for -rc2.

--b.

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Highlights:

- Fixes from Trond for some races in the NFSv4 state code.
- Fix from Naofumi Honda for a typo in the blocked lock notificiation code.
- Fixes from Vasily Averin for some problems starting and stopping lockd especially in network namespaces.

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Andrew Elble (2):
nfsd: fix locking validator warning on nfs4_ol_stateid->st_mutex class
nfsd: check for use of the closed special stateid

Bhumika Goyal (3):
sunrpc: make the function arg as const
NFSD: make cache_detail structures const
SUNRPC: make cache_detail structures const

Naofumi Honda (1):
nfsd: fix panic in posix_unblock_lock called from nfs4_laundromat

Trond Myklebust (8):
nfsd: Fix stateid races between OPEN and CLOSE
nfsd: Fix another OPEN stateid race
nfsd: CLOSE SHOULD return the invalid special stateid for NFSv4.x (x>0)
nfsd: Ensure we don't recognise lock stateids after freeing them
nfsd4: move find_lock_stateid
nfsd: Fix race in lock stateid creation
nfsd: Ensure we check stateid validity in the seqid operation checks
nfsd: Fix races with check_stateid_generation()

Vasily Averin (9):
nfsd: remove net pointer from debug messages
lockd: remove net pointer from messages
grace: replace BUG_ON by WARN_ONCE in exit_net hook
lockd: added cleanup checks in exit_net hook
lockd: lost rollback of set_grace_period() in lockd_down_net() race of lockd inetaddr notifiers vs nlmsvc_rqst change race of nfsd inetaddr notifiers vs nn->nfsd_serv change nlm_shutdown_hosts_net() cleanup
lockd: fix "list_add double add" caused by legacy signal interface

 fs/lockd/host.c                   |  24 ++--
 fs/lockd/mon.c                    |   3 +-
 fs/lockd/svc.c                    |  38 +++++-
 fs/lockd/svcsubs.c                |   2 +-
 fs/nfs_common/grace.c             |  10 +-
 fs/nfsd/export.c                  |  10 +-
 fs/nfsd/netns.h                   |   3 +
 fs/nfsd/nfs4idmap.c               |   4 +-
 fs/nfsd/nfs4state.c               | 279 +++++++++++++++++++++++++-------------
 fs/nfsd/nfsctl.c                  |   3 +
 fs/nfsd/nfssvc.c                  |  14 +-
 include/linux/sunrpc/cache.h      |   2 +-
 net/sunrpc/auth_gss/svcauth_gss.c |   4 +-
 net/sunrpc/cache.c                |   2 +-
 net/sunrpc/svcauth_unix.c         |   4 +-
 15 files changed, 270 insertions(+), 132 deletions(-)