Merge tag 'nfsd-4.15' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "Lots of good bugfixes, including:

   -  fix a number of races in the NFSv4+ state code

   -  fix some shutdown crashes in multiple-network-namespace cases

   -  relax our 4.1 session limits; if you've an artificially low limit
      to the number of 4.1 clients that can mount simultaneously, try
      upgrading"

* tag 'nfsd-4.15' of git://linux-nfs.org/~bfields/linux: (22 commits)
  SUNRPC: Improve ordering of transport processing
  nfsd: deal with revoked delegations appropriately
  svcrdma: Enqueue after setting XPT_CLOSE in completion handlers
  nfsd: use nfs->ns.inum as net ID
  rpc: remove some BUG()s
  svcrdma: Preserve CB send buffer across retransmits
  nfds: avoid gettimeofday for nfssvc_boot time
  fs, nfsd: convert nfs4_file.fi_ref from atomic_t to refcount_t
  fs, nfsd: convert nfs4_cntl_odstate.co_odcount from atomic_t to refcount_t
  fs, nfsd: convert nfs4_stid.sc_count from atomic_t to refcount_t
  lockd: double unregister of inetaddr notifiers
  nfsd4: catch some false session retries
  nfsd4: fix cached replies to solo SEQUENCE compounds
  sunrcp: make function _svc_create_xprt static
  SUNRPC: Fix tracepoint storage issues with svc_recv and svc_rqst_status
  nfsd: use ARRAY_SIZE
  nfsd: give out fewer session slots as limit approaches
  nfsd: increase DRC cache limit
  nfsd: remove unnecessary nofilehandle checks
  nfs_common: convert int to bool
  ...

fs/nfsd/nfs4layouts.c

@@ -336,7 +336,7 @@ nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
 
 	trace_layout_recall(&ls->ls_stid.sc_stateid);
 
-	atomic_inc(&ls->ls_stid.sc_count);
+	refcount_inc(&ls->ls_stid.sc_count);
 	nfsd4_run_cb(&ls->ls_recall);
 
 out_unlock:
@@ -441,7 +441,7 @@ nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
 			goto done;
 	}
 
-	atomic_inc(&ls->ls_stid.sc_count);
+	refcount_inc(&ls->ls_stid.sc_count);
 	list_add_tail(&new->lo_perstate, &ls->ls_layouts);
 	new = NULL;
 done: