From: Yan, Zheng <zyan@redhat.com>
Date: Wed, 10 May 2017 01:39:43 +0000 (+0800)
Subject: mds: check frag bits limit before split dirfrag
X-Git-Tag: v12.1.0~10^2~28^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=661d17ee66ef4a17b7d567159f8378ba94c8ab2b;p=ceph.git

mds: check frag bits limit before split dirfrag

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
---

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index c0433ec419ba..59448528d9dd 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -10844,6 +10844,11 @@ void MDCache::split_dir(CDir *dir, int bits)
     return;
   }
 
+  if (dir->frag.bits() + bits > 24) {
+    dout(7) << __func__ << " frag bits > 24, dropping" << dendl;
+    return;
+  }
+
   MDRequestRef mdr = request_start_internal(CEPH_MDS_OP_FRAGMENTDIR);
   mdr->more()->fragment_base = dir->dirfrag();