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Commit d0379a5d authored by Trond Myklebust's avatar Trond Myklebust
Browse files

pNFS/flexfiles: Support server-supplied layoutstats sampling period 



Some servers want to be able to control the frequency with which clients
report layoutstats, for instance, in order to monitor QoS for a particular
file or set of file. In order to support this, the flexfiles layout allows
the server to pass this info as a hint in the layout payload.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent f4848303

fs/nfs/flexfilelayout/flexfilelayout.c

+13 −3
Original line number Diff line number Diff line
@@ -505,9 +505,17 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 
	}



	p = xdr_inline_decode(&stream, 4);

	if (p)

	if (!p)

		goto out_sort_mirrors;

	fls->flags = be32_to_cpup(p);



	p = xdr_inline_decode(&stream, 4);

	if (!p)

		goto out_sort_mirrors;

	for (i=0; i < fls->mirror_array_cnt; i++)

		fls->mirror_array[i]->report_interval = be32_to_cpup(p);



out_sort_mirrors:

	ff_layout_sort_mirrors(fls);

	rc = ff_layout_check_layout(lgr);

	if (rc)
@@ -603,7 +611,9 @@ nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 
		mirror->start_time = now;

	if (ktime_equal(mirror->last_report_time, notime))

		mirror->last_report_time = now;

	if (layoutstats_timer != 0)

	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)) >=

			report_interval) {

fs/nfs/flexfilelayout/flexfilelayout.h

+1 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ struct nfs4_ff_layout_mirror { 
	struct nfs4_ff_layoutstat	write_stat;

	ktime_t				start_time;

	ktime_t				last_report_time;

	u32				report_interval;

};



struct nfs4_ff_layout_segment {