osd_types: note that write_tier wins if read_tier is different

For pg_pool_t.

Signed-off-by: Greg Farnum <greg@inktank.com>

diff --git a/src/osd/osd_types.h b/src/osd/osd_types.h
index f3a307e30402bbd570736630a1f1ddc1f6547ed5..3eb14246cc523397b72acddda87758d0bc580d43 100644 (file)
--- a/src/osd/osd_types.h
+++ b/src/osd/osd_types.h
@@ -805,6 +805,7 @@ public:
 
   set<uint64_t> tiers;      ///< pools that are tiers of us
   int64_t tier_of;         ///< pool for which we are a tier
+  // Note that write wins for read+write ops
   int64_t read_tier;       ///< pool/tier for objecter to direct reads to
   int64_t write_tier;      ///< pool/tier for objecter to direct writes to
   cache_mode_t cache_mode;  ///< cache pool mode