Add XFS metadata: blocks per file and block size (#33)

Add number of blocks to xfs inode
Extend unit tests with checks on block size

dissect/xfs/xfs.py

@@ -294,6 +294,10 @@ def _has_large_extent_counts(self) -> bool:
     def size(self) -> int:
         return self.inode.di_size
 
+    @property
+    def nblocks(self) -> int:
+        return self.inode.di_nblocks
+
     @property
     def data_extents(self) -> int:
         if self._has_large_extent_counts():

tests/test_xfs.py

@@ -11,6 +11,7 @@ def test_xfs(xfs_bin):
     xfs = XFS(xfs_bin)
 
     assert xfs.version == 5
+    assert xfs.block_size == 4096
     assert str(xfs.uuid) == "3fb8342e-e144-4f0c-8bd7-725e78966200"
     assert str(xfs.meta_uuid) == "00000000-0000-0000-0000-000000000000"
 
@@ -22,9 +23,11 @@ def test_xfs(xfs_bin):
     assert list(root.listdir().keys()) == [".", "..", "test_file", "test_dir", "test_link"]
 
     test_file = xfs.get("test_file")
+    assert test_file.nblocks == 1
     assert test_file.open().read() == b"test content\n"
 
     test_link = xfs.get("test_link")
+    assert test_link.nblocks == 0
     assert test_link.filetype == stat.S_IFLNK
     assert test_link.link == "test_dir/test_file"
 
@@ -34,18 +37,22 @@ def test_xfs_sparse(xfs_sparse_bin):
 
     sparse_start = xfs.get("sparse_start")
     assert sparse_start.size == 0x258000
+    assert sparse_start.nblocks == 200
     assert sparse_start.dataruns() == [(None, 400), (1392, 200)]
 
     sparse_hole = xfs.get("sparse_hole")
     assert sparse_hole.size == 0x258000
+    assert sparse_hole.nblocks == 400
     assert sparse_hole.dataruns() == [(1792, 200), (None, 200), (2192, 200)]
 
     sparse_end = xfs.get("sparse_end")
     assert sparse_end.size == 0x190000
+    assert sparse_end.nblocks == 200
     assert sparse_end.dataruns() == [(2392, 200), (None, 200)]
 
     sparse_all = xfs.get("sparse_all")
     assert sparse_all.size == 0x500000
+    assert sparse_all.nblocks == 0
     assert sparse_all.dataruns() == [(None, 1280)]