client: abort the client if we couldn't invalidate dentry caches

The option 'client_die_on_failed_dentry_invalidate' requires to kill
the client when fails to invalidate the dentry caches from kernel.
The CephFS client requires a mechanism to invalidate dentries in the
caller (e.g. the kernel for ceph-fuse) when capabilities must be recalled.
If the client cannot do this then the MDS cache cannot shrink which
can cause the MDS to fail.

Introduced by commit 8c778e79840f1aa9b9731e2ef20881da0d122fda.

Fixes: https://tracker.ceph.com/issues/57126
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit c8140cdeab5a5cc88da94e697b97b107155a601c)

diff --git a/src/client/Client.cc b/src/client/Client.cc
index df5021af17129f77cbfe911960b47263e7b57771..17ed5e781248f0b7ff4f2a94d6bf0471ef05c4d9 100644 (file)
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -4439,7 +4439,10 @@ public:
   explicit C_Client_Remount(Client *c) : client(c) {}
   void finish(int r) override {
     ceph_assert(r == 0);
-    client->_do_remount(true);
+    auto result = client->_do_remount(true);
+    if (result.second) {
+      ceph_abort();
+    }
   }
 };