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)]