From: Yan, Zheng <zyan@redhat.com>
Date: Fri, 28 Nov 2014 13:09:08 +0000 (+0800)
Subject: mds: add helper to force MDS readonly
X-Git-Tag: v0.91~52^2~14^2~7
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=e0637b47c702fd6b4bcfff0a653791c2fd9ec495;p=ceph.git

mds: add helper to force MDS readonly

the helper function marks MDS readonly, then revokes write caps from
clients.

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

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index 568e1eb1095..6488870bf85 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -11274,6 +11274,27 @@ void MDCache::rollback_uncommitted_fragments()
   }
 }
 
+void MDCache::force_readonly()
+{
+  if (is_readonly())
+    return;
+
+  dout(1) << "force file system read-only" << dendl;
+  mds->clog->warn() << "force file system read-only\n";
+
+  set_readonly();
+
+  // revoke write caps
+  for (ceph::unordered_map<vinodeno_t,CInode*>::iterator p = inode_map.begin();
+       p != inode_map.end();
+       ++p) {
+    CInode *in = p->second;
+    if (in->is_head())
+      mds->locker->eval(in, CEPH_CAP_LOCKS);
+  }
+
+  mds->mdlog->flush();
+}
 
 
 // ==============================================================
diff --git a/src/mds/MDCache.h b/src/mds/MDCache.h
index 2d20ced367d..9366cb41367 100644
--- a/src/mds/MDCache.h
+++ b/src/mds/MDCache.h
@@ -107,7 +107,7 @@ public:
     stray_index = (stray_index+1)%NUM_STRAY;
   }
   bool is_readonly() { return readonly; }
-
+  void force_readonly();
 
   DecayRate decayrate;