@@ -163,6 +163,8 @@ static struct afs_server *afs_install_server(struct afs_cell *cell,
rb_insert_color(&server->uuid_rb, &net->fs_servers);
hlist_add_head_rcu(&server->proc_link, &net->fs_proc);
+ afs_get_cell(cell, afs_cell_trace_get_server);
+
added_dup:
write_seqlock(&net->fs_addr_lock);
estate = rcu_dereference_protected(server->endpoint_state,
@@ -442,6 +444,7 @@ static void afs_server_rcu(struct rcu_head *rcu)
atomic_read(&server->active), afs_server_trace_free);
afs_put_endpoint_state(rcu_access_pointer(server->endpoint_state),
afs_estate_trace_put_server);
+ afs_put_cell(server->cell, afs_cell_trace_put_server);
kfree(server);
}
@@ -174,6 +174,7 @@ enum yfs_cm_operation {
EM(afs_cell_trace_get_queue_dns, "GET q-dns ") \
EM(afs_cell_trace_get_queue_manage, "GET q-mng ") \
EM(afs_cell_trace_get_queue_new, "GET q-new ") \
+ EM(afs_cell_trace_get_server, "GET server") \
EM(afs_cell_trace_get_vol, "GET vol ") \
EM(afs_cell_trace_insert, "INSERT ") \
EM(afs_cell_trace_manage, "MANAGE ") \
@@ -182,6 +183,7 @@ enum yfs_cm_operation {
EM(afs_cell_trace_put_destroy, "PUT destry") \
EM(afs_cell_trace_put_queue_work, "PUT q-work") \
EM(afs_cell_trace_put_queue_fail, "PUT q-fail") \
+ EM(afs_cell_trace_put_server, "PUT server") \
EM(afs_cell_trace_put_vol, "PUT vol ") \
EM(afs_cell_trace_see_source, "SEE source") \
EM(afs_cell_trace_see_ws, "SEE ws ") \
Give an afs_server object a ref on the afs_cell object it points to so that the cell doesn't get deleted before the server record. Whilst this is circular (cell -> vol -> server_list -> server -> cell), the ref only pins the memory, not the lifetime as that's controlled by the activity counter. When the volume's activity counter reaches 0, it detaches from the cell and discards its server list; when a cell's activity counter reaches 0, it discards its root volume. At that point, the circularity is cut. Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation") Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: Jakub Kicinski <kuba@kernel.org> cc: "David S. Miller" <davem@davemloft.net> cc: Eric Dumazet <edumazet@google.com> cc: Paolo Abeni <pabeni@redhat.com> cc: Simon Horman <horms@kernel.org> cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org --- fs/afs/server.c | 3 +++ include/trace/events/afs.h | 2 ++ 2 files changed, 5 insertions(+)