[PATCH 4/6] libceph: define ceph_pg_pool_name_by_id()

[Alex Elder <elder@inktank.com>]

Define and export function ceph_pg_pool_name_by_id() to supply
the name of a pg pool whose id is given.  This will be used by
the next patch.

Signed-off-by: Alex Elder <elder@inktank.com>
---
 include/linux/ceph/osdmap.h |    1 +
 net/ceph/osdmap.c           |   16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index e88a620..5ea57ba 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -123,6 +123,7 @@ extern int ceph_calc_pg_acting(struct ceph_osdmap
*osdmap, struct ceph_pg pgid,
 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
 				struct ceph_pg pgid);

+extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64
id);
 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char
*name);

 #endif
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index f552aa4..de73214 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -469,6 +469,22 @@ static struct ceph_pg_pool_info
*__lookup_pg_pool(struct rb_root *root, int id)
 	return NULL;
 }

+const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id)
+{
+	struct ceph_pg_pool_info *pi;
+
+	if (id == CEPH_NOPOOL)
+		return NULL;
+
+	if (WARN_ON_ONCE(id > (u64) INT_MAX))
+		return NULL;
+
+	pi = __lookup_pg_pool(&map->pg_pools, (int) id);
+
+	return pi ? pi->name : NULL;
+}
+EXPORT_SYMBOL(ceph_pg_pool_name_by_id);
+
 int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name)
 {
 	struct rb_node *rbp;
-- 
1.7.9.5