Merge tag 'nfs-for-4.20-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

  Stable fixes:
   - Fix the NFSv4.1 r/wsize sanity checking
   - Reset the RPC/RDMA credit grant properly after a disconnect
   - Fix a missed page unlock after pg_doio()

  Features and optimisations:
   - Overhaul of the RPC client socket code to eliminate a locking
     bottleneck and reduce the latency when transmitting lots of
     requests in parallel.
   - Allow parallelisation of the RPCSEC_GSS encoding of an RPC request.
   - Convert the RPC client socket receive code to use iovec_iter() for
     improved efficiency.
   - Convert several NFS and RPC lookup operations to use RCU instead of
     taking global locks.
   - Avoid the need for BH-safe locks in the RPC/RDMA back channel.

  Bugfixes and cleanups:
   - Fix lock recovery during NFSv4 delegation recalls
   - Fix the NFSv4 + NFSv4.1 "lookup revalidate + open file" case.
   - Fixes for the RPC connection metrics
   - Various RPC client layer cleanups to consolidate stream based
     sockets
   - RPC/RDMA connection cleanups
   - Simplify the RPC/RDMA cleanup after memory operation failures
   - Clean ups for NFS v4.2 copy completion and NFSv4 open state
     reclaim"

* tag 'nfs-for-4.20-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (97 commits)
  SUNRPC: Convert the auth cred cache to use refcount_t
  SUNRPC: Convert auth creds to use refcount_t
  SUNRPC: Simplify lookup code
  SUNRPC: Clean up the AUTH cache code
  NFS: change sign of nfs_fh length
  sunrpc: safely reallow resvport min/max inversion
  nfs: remove redundant call to nfs_context_set_write_error()
  nfs: Fix a missed page unlock after pg_doio()
  SUNRPC: Fix a compile warning for cmpxchg64()
  NFSv4.x: fix lock recovery during delegation recall
  SUNRPC: use cmpxchg64() in gss_seq_send64_fetch_and_inc()
  xprtrdma: Squelch a sparse warning
  xprtrdma: Clean up xprt_rdma_disconnect_inject
  xprtrdma: Add documenting comments
  xprtrdma: Report when there were zero posted Receives
  xprtrdma: Move rb_flags initialization
  xprtrdma: Don't disable BH's in backchannel server
  xprtrdma: Remove memory address of "ep" from an error message
  xprtrdma: Rename rpcrdma_qp_async_error_upcall
  xprtrdma: Simplify RPC wake-ups on connect
  ...

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