[PATCH 29/33] libceph: return primary from ceph_calc_pg_acting()

[Ilya Dryomov]

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.dryo...@inktank.com>
---
 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 1963623bd488..7193b012ee02 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1644,19 +1644,21 @@ 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 */
@@ -1677,12 +1679,14 @@ 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;
 }
-- 
1.7.10.4

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