mds: check for snapshots on parent snaprealms

The code was incorrectly only looking at snapshots in the current snaprealm.

Fixes: https://tracker.ceph.com/issues/70912
Signed-off-by: Patrick Donnelly <[email protected]>

Author: batrick

src/mds/Server.cc

@@ -6595,11 +6595,7 @@ void Server::handle_client_setvxattr(const MDRequestRef& mdr, CInode *cur)
     if (!xlock_policylock(mdr, cur, false, false, std::move(lov)))
       return;
 
-    if (_dir_is_nonempty(mdr, cur)) {
-      respond_to_request(mdr, -ENOTEMPTY);
-      return;
-    }
-    if (cur->snaprealm && cur->snaprealm->srnode.snaps.size()) {
+    if (_dir_is_nonempty(mdr, cur) || _dir_has_snaps(mdr, cur)) {
       respond_to_request(mdr, -ENOTEMPTY);
       return;
     }
@@ -6627,11 +6623,7 @@ void Server::handle_client_setvxattr(const MDRequestRef& mdr, CInode *cur)
     if (!xlock_policylock(mdr, cur, false, false, std::move(lov)))
       return;
 
-    if (_dir_is_nonempty(mdr, cur)) {
-      respond_to_request(mdr, -ENOTEMPTY);
-      return;
-    }
-    if (cur->snaprealm && cur->snaprealm->srnode.snaps.size()) {
+    if (_dir_is_nonempty(mdr, cur) || _dir_has_snaps(mdr, cur)) {
       respond_to_request(mdr, -ENOTEMPTY);
       return;
     }
@@ -6664,11 +6656,7 @@ void Server::handle_client_setvxattr(const MDRequestRef& mdr, CInode *cur)
     if (!xlock_policylock(mdr, cur, false, false, std::move(lov)))
       return;
 
-    if (_dir_is_nonempty(mdr, cur)) {
-      respond_to_request(mdr, -ENOTEMPTY);
-      return;
-    }
-    if (cur->snaprealm && cur->snaprealm->srnode.snaps.size()) {
+    if (_dir_is_nonempty(mdr, cur) || _dir_has_snaps(mdr, cur)) {
       respond_to_request(mdr, -ENOTEMPTY);
       return;
     }
@@ -6692,11 +6680,7 @@ void Server::handle_client_setvxattr(const MDRequestRef& mdr, CInode *cur)
     if (!xlock_policylock(mdr, cur, false, false, std::move(lov)))
       return;
 
-    if (_dir_is_nonempty(mdr, cur)) {
-      respond_to_request(mdr, -ENOTEMPTY);
-      return;
-    }
-    if (cur->snaprealm && cur->snaprealm->srnode.snaps.size()) {
+    if (_dir_is_nonempty(mdr, cur) || _dir_has_snaps(mdr, cur)) {
       respond_to_request(mdr, -ENOTEMPTY);
       return;
     }
@@ -9225,6 +9209,16 @@ bool Server::_dir_is_nonempty_unlocked(const MDRequestRef& mdr, CInode *in)
   return false;
 }
 
+bool Server::_dir_has_snaps(const MDRequestRef& mdr, CInode *diri)
+{
+  dout(10) << __func__ << ": " << *diri << dendl;
+  ceph_assert(diri->is_auth());
+  ceph_assert(diri->snaplock.can_read(mdr->get_client()));
+
+  SnapRealm *realm = diri->find_snaprealm();
+  return !realm->get_snaps().empty();
+}
+
 bool Server::_dir_is_nonempty(const MDRequestRef& mdr, CInode *in)
 {
   dout(10) << "dir_is_nonempty " << *in << dendl;

src/mds/Server.h

@@ -302,6 +302,7 @@ class Server {
   void handle_client_unlink(const MDRequestRef& mdr);
   bool _dir_is_nonempty_unlocked(const MDRequestRef& mdr, CInode *rmdiri);
   bool _dir_is_nonempty(const MDRequestRef& mdr, CInode *rmdiri);
+  bool _dir_has_snaps(const MDRequestRef& mdr, CInode *diri);
   void _unlink_local(const MDRequestRef& mdr, CDentry *dn, CDentry *straydn);
   void _unlink_local_finish(const MDRequestRef& mdr,
 			    CDentry *dn, CDentry *straydn,