rgw: make RGWEnv return a const ref. to its map

We already have a public method `set` for setting values in the RGW env
map, making the map as a read only. In addition:

- Added const to other  methods in `RGWEnv` which are getters
- `req_info::init_meta` also reused the same `iter` name for an internal
  find, changed the var name
- `add_grants_headers` now accepts an RGWEnv instead of the map
- use range based for loops wherever the code was changed
- req_info holds a ptr to a const RGWEnv, since we seem to only read the
  values from it

Signed-off-by: Abhishek Lekshmanan <abhishek@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/rgw/rgw_acl_s3.h b/src/rgw/rgw_acl_s3.h
index 6991a0b8363..149db40e70b 100644
--- a/src/rgw/rgw_acl_s3.h
+++ b/src/rgw/rgw_acl_s3.h
@@ -92,7 +92,7 @@ public:
     owner = _owner;
     return ret;
   }
-  int create_from_headers(RGWRados *store, RGWEnv *env, ACLOwner& _owner);
+  int create_from_headers(RGWRados *store, const RGWEnv *env, ACLOwner& _owner);
 };
 
 /**