os/bluestore: Fix ceph-bluestore-tool allocmap command

BlueStore::read_allocation_from_drive_for_bluestore_tool was
not informed that multiple bdev labels can exist and reserve space.
Comparison of real alloc vs recovered alloc was failing.

Fixes: https://tracker.ceph.com/issues/67596

Signed-off-by: Adam Kupczyk <[email protected]>

Author: aclamk

src/os/bluestore/BlueStore.cc

@@ -20527,6 +20527,14 @@ int BlueStore::read_allocation_from_drive_for_bluestore_tool()
     if (ret < 0) {
       return ret;
     }
+    if (bdev_label_multi) {
+      uint64_t lsize = std::max(BDEV_LABEL_BLOCK_SIZE, min_alloc_size);
+      for (uint64_t p : bdev_label_valid_locations) {
+	if (p != BDEV_FIRST_LABEL_POSITION) {
+	  allocator->init_rm_free(p, lsize);
+	}
+      }
+    }
 
     duration = ceph_clock_now() - start;
     stats.insert_count = 0;