Patch "pNFS/flexfiles: Fix layoutstat periodic reporting" has been added to the 4.7-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    pNFS/flexfiles: Fix layoutstat periodic reporting

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pnfs-flexfiles-fix-layoutstat-periodic-reporting.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 1c8d477a77e2d1d3504419e7f2e02e6422becf9a Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Sun, 14 Aug 2016 12:47:49 -0400
Subject: pNFS/flexfiles: Fix layoutstat periodic reporting

From: Trond Myklebust <trond.myklebust@primarydata.com>

commit 1c8d477a77e2d1d3504419e7f2e02e6422becf9a upstream.

Putting the periodicity timer in the mirror instances is causing
non-scalable reporting behaviour and missed reporting intervals.
When you recall layouts and/or implement client side mirroring, it
leads to consecutive reports with only a few ms between RPC calls.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Fixes: d0379a5d066a9 ("pNFS/flexfiles: Support server-supplied...")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/flexfilelayout/flexfilelayout.c |    8 ++++----
 fs/nfs/flexfilelayout/flexfilelayout.h |    2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -37,6 +37,7 @@ ff_layout_alloc_layout_hdr(struct inode
 	if (ffl) {
 		INIT_LIST_HEAD(&ffl->error_list);
 		INIT_LIST_HEAD(&ffl->mirrors);
+		ffl->last_report_time = ktime_get();
 		return &ffl->generic_hdr;
 	} else
 		return NULL;
@@ -640,19 +641,18 @@ nfs4_ff_layoutstat_start_io(struct nfs4_
 {
 	static const ktime_t notime = {0};
 	s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL;
+	struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout);
 
 	nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now);
 	if (ktime_equal(mirror->start_time, notime))
 		mirror->start_time = now;
-	if (ktime_equal(mirror->last_report_time, notime))
-		mirror->last_report_time = now;
 	if (mirror->report_interval != 0)
 		report_interval = (s64)mirror->report_interval * 1000LL;
 	else if (layoutstats_timer != 0)
 		report_interval = (s64)layoutstats_timer * 1000LL;
-	if (ktime_to_ms(ktime_sub(now, mirror->last_report_time)) >=
+	if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >=
 			report_interval) {
-		mirror->last_report_time = now;
+		ffl->last_report_time = now;
 		return true;
 	}
 
--- a/fs/nfs/flexfilelayout/flexfilelayout.h
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -84,7 +84,6 @@ struct nfs4_ff_layout_mirror {
 	struct nfs4_ff_layoutstat	read_stat;
 	struct nfs4_ff_layoutstat	write_stat;
 	ktime_t				start_time;
-	ktime_t				last_report_time;
 	u32				report_interval;
 };
 
@@ -101,6 +100,7 @@ struct nfs4_flexfile_layout {
 	struct pnfs_ds_commit_info commit_info;
 	struct list_head	mirrors;
 	struct list_head	error_list; /* nfs4_ff_layout_ds_err */
+	ktime_t			last_report_time; /* Layoutstat report times */
 };
 
 static inline struct nfs4_flexfile_layout *


Patches currently in stable-queue which might be from trond.myklebust@primarydata.com are

queue-4.7/nfs-pnfs-do-not-clobber-existing-pgio_done_cb-in-nfs4_proc_read_setup.patch
queue-4.7/pnfs-flexfiles-fix-layoutcommit-after-a-commit-to-ds.patch
queue-4.7/pnfs-flexfiles-fix-layoutstat-periodic-reporting.patch
queue-4.7/pnfs-files-fix-layoutcommit-after-a-commit-to-ds.patch
queue-4.7/sunrpc-silence-warn_on-when-nfsv4.1-over-rdma-is-in-use.patch