From: Yan, Zheng <zyan@redhat.com>
Date: Wed, 5 Aug 2020 08:04:30 +0000 (+0800)
Subject: mds: disallow hardlink across subvolume
X-Git-Tag: v15.2.9~110^2~2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=6c387384c7c91a7c1166fac742aa17f14dd055f1;p=ceph.git

mds: disallow hardlink across subvolume

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 55cc3f7d7d27837bfe64ee46444358c0e45d16f6)
---

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 3093e7dfeef1..2a510b6a045c 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -6340,6 +6340,16 @@ void Server::handle_client_link(MDRequestRef& mdr)
       return;
   }
 
+  CInode* target_pin = targeti->get_projected_parent_dir()->inode;
+  SnapRealm *target_realm = target_pin->find_snaprealm();
+  if (target_pin != dir->inode &&
+      target_realm->get_subvolume_ino() !=
+      dir->inode->find_snaprealm()->get_subvolume_ino()) {
+    dout(7) << "target is in different subvolume, failing..." << dendl;
+    respond_to_request(mdr, -EXDEV);
+    return;
+  }
+
   // go!
   ceph_assert(g_conf()->mds_kill_link_at != 1);