tools/ceph-bluestore-tool: optimize offline trim report info

Fixes: https://tracker.ceph.com/issues/67932
Signed-off-by: Yite Gu <[email protected]>

Author: YiteGu

src/os/bluestore/BlueFS.cc

@@ -4817,11 +4817,16 @@ void BlueFS::trim_free_space(const string& type, std::ostream& outss)
     outss << "device " << type << " is not configured";
     return;
   }
-  if (alloc[bdev_id] && !is_shared_alloc(bdev_id)) {
+  if (alloc[bdev_id]) {
     if (!bdev[bdev_id]->is_discard_supported()) {
       outss << "device " << type << " does not support trim";
       return;
     }
+    if (is_shared_alloc(bdev_id)) {
+      outss << "device " << type
+            << " shares allocations with main device, trimming skipped.";
+      return;
+    }
     alloc[bdev_id]->foreach(iterated_allocation);
     outss << "device " << type << " trim done";
   }