From: Jianpeng Ma <jianpeng.ma@intel.com>
Date: Mon, 12 Jan 2015 06:35:28 +0000 (+0800)
Subject: librbd: Don't do readahead for random read.
X-Git-Tag: v0.93~148^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=a23676bf8f763223509cad3e98d218d81c548c3b;p=ceph.git

librbd: Don't do readahead for random read.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
---

diff --git a/src/librbd/internal.cc b/src/librbd/internal.cc
index 7c51b5c36580..ddbedeb8fe87 100644
--- a/src/librbd/internal.cc
+++ b/src/librbd/internal.cc
@@ -3822,7 +3822,8 @@ reprotect_and_return_err:
 
     // readahead
     const md_config_t *conf = ictx->cct->_conf;
-    if (ictx->object_cacher && conf->rbd_readahead_max_bytes > 0) {
+    if (ictx->object_cacher && conf->rbd_readahead_max_bytes > 0 &&
+	!(op_flags & LIBRADOS_OP_FLAG_FADVISE_RANDOM)) {
       readahead(ictx, image_extents, conf);
     }