Merge tag 'nfs-for-5.3-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

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

  Stable fixes:

   - SUNRPC: Ensure bvecs are re-synced when we re-encode the RPC
     request

   - Fix an Oops in ff_layout_track_ds_error due to a PTR_ERR()
     dereference

   - Revert buggy NFS readdirplus optimisation

   - NFSv4: Handle the special Linux file open access mode

   - pnfs: Fix a problem where we gratuitously start doing I/O through
     the MDS

  Features:

   - Allow NFS client to set up multiple TCP connections to the server
     using a new 'nconnect=X' mount option. Queue length is used to
     balance load.

   - Enhance statistics reporting to report on all transports when using
     multiple connections.

   - Speed up SUNRPC by removing bh-safe spinlocks

   - Add a mechanism to allow NFSv4 to request that containers set a
     unique per-host identifier for when the hostname is not set.

   - Ensure NFSv4 updates the lease_time after a clientid update

  Bugfixes and cleanup:

   - Fix use-after-free in rpcrdma_post_recvs

   - Fix a memory leak when nfs_match_client() is interrupted

   - Fix buggy file access checking in NFSv4 open for execute

   - disable unsupported client side deduplication

   - Fix spurious client disconnections

   - Fix occasional RDMA transport deadlock

   - Various RDMA cleanups

   - Various tracepoint fixes

   - Fix the TCP callback channel to guarantee the server can actually
     send the number of callback requests that was negotiated at mount
     time"

* tag 'nfs-for-5.3-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (68 commits)
  pnfs/flexfiles: Add tracepoints for detecting pnfs fallback to MDS
  pnfs: Fix a problem where we gratuitously start doing I/O through the MDS
  SUNRPC: Optimise transport balancing code
  SUNRPC: Ensure the bvecs are reset when we re-encode the RPC request
  pnfs/flexfiles: Fix PTR_ERR() dereferences in ff_layout_track_ds_error
  NFSv4: Don't use the zero stateid with layoutget
  SUNRPC: Fix up backchannel slot table accounting
  SUNRPC: Fix initialisation of struct rpc_xprt_switch
  SUNRPC: Skip zero-refcount transports
  SUNRPC: Replace division by multiplication in calculation of queue length
  NFSv4: Validate the stateid before applying it to state recovery
  nfs4.0: Refetch lease_time after clientid update
  nfs4: Rename nfs41_setup_state_renewal
  nfs4: Make nfs4_proc_get_lease_time available for nfs4.0
  nfs: Fix copy-and-paste error in debug message
  NFS: Replace 16 seq_printf() calls by seq_puts()
  NFS: Use seq_putc() in nfs_show_stats()
  Revert "NFS: readdirplus optimization by cache mechanism" (memleak)
  SUNRPC: Fix transport accounting when caller specifies an rpc_xprt
  NFS: Record task, client ID, and XID in xdr_status trace points
  ...

1 files changed, 15 insertions, 8 deletions

diff --git a/net/sunrpc/stats.c b/net/sunrpc/stats.c
index 2b6dc7e5f74f..7c74197c2ecf 100644
--- a/net/sunrpc/stats.c
+++ b/net/sunrpc/stats.c
@@ -177,6 +177,8 @@ void rpc_count_iostats_metrics(const struct rpc_task *task,
 
 	execute = ktime_sub(now, task->tk_start);
 	op_metrics->om_execute = ktime_add(op_metrics->om_execute, execute);
+	if (task->tk_status < 0)
+		op_metrics->om_error_status++;
 
 	spin_unlock(&op_metrics->om_lock);
 
@@ -219,13 +221,14 @@ static void _add_rpc_iostats(struct rpc_iostats *a, struct rpc_iostats *b)
 	a->om_queue = ktime_add(a->om_queue, b->om_queue);
 	a->om_rtt = ktime_add(a->om_rtt, b->om_rtt);
 	a->om_execute = ktime_add(a->om_execute, b->om_execute);
+	a->om_error_status += b->om_error_status;
 }
 
 static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
 			       int op, const struct rpc_procinfo *procs)
 {
 	_print_name(seq, op, procs);
-	seq_printf(seq, "%lu %lu %lu %Lu %Lu %Lu %Lu %Lu\n",
+	seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %llu %lu\n",
 		   stats->om_ops,
 		   stats->om_ntrans,
 		   stats->om_timeouts,
@@ -233,12 +236,20 @@ static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
 		   stats->om_bytes_recv,
 		   ktime_to_ms(stats->om_queue),
 		   ktime_to_ms(stats->om_rtt),
-		   ktime_to_ms(stats->om_execute));
+		   ktime_to_ms(stats->om_execute),
+		   stats->om_error_status);
+}
+
+static int do_print_stats(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *seqv)
+{
+	struct seq_file *seq = seqv;
+
+	xprt->ops->print_stats(xprt, seq);
+	return 0;
 }
 
 void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
 {
-	struct rpc_xprt *xprt;
 	unsigned int op, maxproc = clnt->cl_maxproc;
 
 	if (!clnt->cl_metrics)
@@ -248,11 +259,7 @@ void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
 	seq_printf(seq, "p/v: %u/%u (%s)\n",
 			clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
 
-	rcu_read_lock();
-	xprt = rcu_dereference(clnt->cl_xprt);
-	if (xprt)
-		xprt->ops->print_stats(xprt, seq);
-	rcu_read_unlock();
+	rpc_clnt_iterate_for_each_xprt(clnt, do_print_stats, seq);
 
 	seq_printf(seq, "\tper-op statistics\n");
 	for (op = 0; op < maxproc; op++) {