From 8008ab1080c1768b02d232dcfd9e161cd47cc9f7 Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <ilya.dryomov@inktank.com>
Date: Mon, 24 Mar 2014 17:12:48 +0200
Subject: [PATCH] libceph: return primary from ceph_calc_pg_acting()
In preparation for adding support for primary_temp, stop assuming
primaryness: add a primary out parameter to ceph_calc_pg_acting() and
change call sites accordingly. Primary is now specified separately
from the order of osds in the set.
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
---
include/linux/ceph/osdmap.h | 2 +-
net/ceph/osd_client.c | 10 ++++------
net/ceph/osdmap.c | 20 ++++++++++++--------
3 files changed, 17 insertions(+), 15 deletions(-)
diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index b0c8f8490663..561ea896c657 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -212,7 +212,7 @@ extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
struct ceph_pg pgid,
- int *osds);
+ int *osds, int *primary);
extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
struct ceph_pg pgid);
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 6f64eec18851..b4157dc22199 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1333,7 +1333,7 @@ static int __map_request(struct ceph_osd_client *osdc,
{
struct ceph_pg pgid;
int acting[CEPH_PG_MAX_SIZE];
- int o = -1, num = 0;
+ int num, o;
int err;
bool was_paused;
@@ -1346,11 +1346,9 @@ static int __map_request(struct ceph_osd_client *osdc,
}
req->r_pgid = pgid;
- err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
- if (err > 0) {
- o = acting[0];
- num = err;
- }
+ num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
+ if (num < 0)
+ num = 0;
was_paused = req->r_paused;
req->r_paused = __req_should_be_paused(osdc, req);
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index f1cad21d1533..df9389ddd56c 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1651,19 +1651,21 @@ static int apply_temps(struct ceph_osdmap *osdmap,
/*
* Calculate acting set for given pgid.
*
- * Return acting set length, or error.
+ * Return acting set length, or error. *primary is set to acting
+ * primary osd id, or -1 if acting set is empty or on error.
*/
int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
- int *osds)
+ int *osds, int *primary)
{
struct ceph_pg_pool_info *pool;
u32 pps;
int len;
- int primary;
pool = __lookup_pg_pool(&osdmap->pg_pools, pgid.pool);
- if (!pool)
- return 0;
+ if (!pool) {
+ *primary = -1;
+ return -ENOENT;
+ }
if (pool->flags & CEPH_POOL_FLAG_HASHPSPOOL) {
/* hash pool id and seed so that pool PGs do not overlap */
@@ -1684,12 +1686,14 @@ int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
}
len = pg_to_raw_osds(osdmap, pool, pgid, pps, osds);
- if (len < 0)
+ if (len < 0) {
+ *primary = -1;
return len;
+ }
- len = raw_to_up_osds(osdmap, pool, osds, len, &primary);
+ len = raw_to_up_osds(osdmap, pool, osds, len, primary);
- len = apply_temps(osdmap, pool, pgid, osds, len, &primary);
+ len = apply_temps(osdmap, pool, pgid, osds, len, primary);
return len;
}