afs: Add a tracepoint to track the lifetime of the afs_volume struct
Add a tracepoint to track the lifetime of the afs_volume struct.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index d4d9a8f..0393f49 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -52,6 +52,7 @@ static struct afs_volume *afs_alloc_volume(struct afs_fs_context *params,
refcount_set(&slist->usage, 1);
rcu_assign_pointer(volume->servers, slist);
+ trace_afs_volume(volume->vid, 1, afs_volume_trace_alloc);
return volume;
error_1:
@@ -158,20 +159,38 @@ static void afs_destroy_volume(struct afs_net *net, struct afs_volume *volume)
afs_put_serverlist(net, rcu_access_pointer(volume->servers));
afs_put_cell(net, volume->cell);
+ trace_afs_volume(volume->vid, atomic_read(&volume->usage),
+ afs_volume_trace_free);
kfree(volume);
_leave(" [destroyed]");
}
/*
- * Drop a reference on a volume record.
+ * Get a reference on a volume record.
*/
-void afs_put_volume(struct afs_net *net, struct afs_volume *volume)
+struct afs_volume *afs_get_volume(struct afs_volume *volume,
+ enum afs_volume_trace reason)
{
if (volume) {
- _enter("%s", volume->name);
+ int u = atomic_inc_return(&volume->usage);
+ trace_afs_volume(volume->vid, u, reason);
+ }
+ return volume;
+}
- if (atomic_dec_and_test(&volume->usage))
+
+/*
+ * Drop a reference on a volume record.
+ */
+void afs_put_volume(struct afs_net *net, struct afs_volume *volume,
+ enum afs_volume_trace reason)
+{
+ if (volume) {
+ afs_volid_t vid = volume->vid;
+ int u = atomic_dec_return(&volume->usage);
+ trace_afs_volume(vid, u, reason);
+ if (u == 0)
afs_destroy_volume(net, volume);
}
}
