From: Yan, Zheng <zyan@redhat.com>
Date: Wed, 5 Aug 2020 07:33:10 +0000 (+0800)
Subject: mds: disallow creating snapshot on descendent directory of subvolume
X-Git-Tag: v15.2.9~110^2~4
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=1c67d225b38cd2e23e68210150bc3677a57f62d1;p=ceph.git

mds: disallow creating snapshot on descendent directory of subvolume

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit 34c6b4437a2e8a49bb76e86d07cd86b740e3f581)
---

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 946c24e19de..f80fee3475e 100644
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -9925,6 +9925,12 @@ void Server::handle_client_mksnap(MDRequestRef& mdr)
   if (!check_access(mdr, diri, MAY_WRITE|MAY_SNAPSHOT))
     return;
 
+  if (inodeno_t subvol_ino = diri->find_snaprealm()->get_subvolume_ino();
+      (subvol_ino && subvol_ino != diri->ino())) {
+    respond_to_request(mdr, -EPERM);
+    return;
+  }
+
   // check if we can create any more snapshots
   // we don't allow any more if we are already at or beyond the limit
   if (diri->snaprealm &&