LU-13922 osd-ldiskfs: no need to add OI cache in readdir

It's a waste of time to call osd_add_oi_cache() in osd_it_ea_rec(),
because each dirent read will override it.

Lustre-change: https://review.whamcloud.com/39782
Lustre-commit: bc593463

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: Iec701bf66153fdf2ba7a3f3b89565381215abf33
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Stephane Thiell <sthiell@stanford.edu>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/40135

Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>

lustre/osd-ldiskfs/osd_handler.c

@@ -7239,8 +7239,6 @@ static inline int osd_it_ea_rec(const struct lu_env *env,
 
 				rc = osd_ea_fid_get(env, obj, ino, fid, id);
 			}
-		} else {
-			osd_id_gen(id, ino, OSD_OII_NOGEN);
 		}
 	}
 
@@ -7250,15 +7248,6 @@ static inline int osd_it_ea_rec(const struct lu_env *env,
 			   it->oie_dirent->oied_namelen,
 			   it->oie_dirent->oied_type, attr);
 
-	if (rc < 0)
-		RETURN(rc);
-
-	if (osd_remote_fid(env, dev, fid))
-		RETURN(0);
-
-	if (likely(!(attr & (LUDA_IGNORE | LUDA_UNKNOWN)) && rc == 0))
-		osd_add_oi_cache(oti, dev, id, fid);
-
 	RETURN(rc > 0 ? 0 : rc);
 }