From 22b5f6036e608c6136b82e4d8a6e4183e586a946 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Fri, 3 Oct 2008 13:34:31 -0700
Subject: [PATCH] mds: create snaprealm for stray dentries resulting from
 rename

This was done in the unlink path, but overlooked by rename(), resulting in
problems down the line when the stray nlink=0 item was purged.
---
 src/mds/MDCache.cc |  1 +
 src/mds/Server.cc  | 24 +++++++++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index 5fd112744dc86..b35bcc161d569 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -4075,6 +4075,7 @@ void MDCache::_do_purge_inode(CInode *in, loff_t newsize, loff_t oldsize)
   // remove
   if (newsize < oldsize) {
     SnapRealm *realm = in->find_snaprealm();
+    assert(realm);
     dout(10) << "_do_purge_inode realm " << *realm << dendl;
     const SnapContext& snapc = realm->get_snap_context();
     dout(10) << "_do_purge_inode snapc " << snapc << " on " << *in << dendl;
diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index a44fb65dbd2ac..e1e1e49567f3e 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -3738,7 +3738,15 @@ void Server::_rename_prepare(MDRequest *mdr,
   // target inode
   if (!linkmerge) {
     if (destdn->is_primary()) {
-      tji = metablob->add_primary_dentry(straydn, true, destdn->inode, tpi);
+      // project snaprealm, too
+      bufferlist snapbl;
+      if (!destdn->inode->snaprealm) {
+	destdn->inode->open_snaprealm(true);   // don't do a split
+	destdn->inode->snaprealm->project_past_parent(straydn->dir->inode->snaprealm, snapbl);
+	destdn->inode->close_snaprealm(true);  // or a matching join
+      } else
+	destdn->inode->snaprealm->project_past_parent(straydn->dir->inode->snaprealm, snapbl);
+      tji = metablob->add_primary_dentry(straydn, true, destdn->inode, tpi, 0, &snapbl);
     } else if (destdn->is_remote()) {
       metablob->add_dir_context(destdn->inode->get_parent_dir());
       mdcache->journal_cow_dentry(mdr, metablob, destdn->inode->parent);
@@ -3829,6 +3837,20 @@ void Server::_rename_apply(MDRequest *mdr, CDentry *srcdn, CDentry *destdn, CDen
       dout(10) << "straydn is " << *straydn << dendl;
       destdn->dir->unlink_inode(destdn);
       straydn->dir->link_primary_inode(straydn, oldin);
+      
+      if (straydn->is_auth()) {
+	SnapRealm *oldparent = destdn->dir->inode->find_snaprealm();
+	bool isnew = false;
+	if (!straydn->inode->snaprealm) {
+	  straydn->inode->open_snaprealm();
+	  straydn->inode->snaprealm->seq = oldparent->get_newest_seq();
+	  isnew = true;
+	}
+	straydn->inode->snaprealm->add_past_parent(oldparent);
+	if (isnew)
+	  mdcache->do_realm_invalidate_and_update_notify(straydn->inode, CEPH_SNAP_OP_SPLIT);
+      }
+
     } else {
       destdn->dir->unlink_inode(destdn);
     }
-- 
2.39.5