Why does not freeblocks number change after deleting a big file?

[Younger Liu <younger.liucn@xxxxxxxxx>]

Hi:
  Analyze ext4 filesystem with "debugfs -R "stats" <device>",
Why does not free blocks number change after deleting a big file?

The big file:
# stat test
  file："test"
  size：290554084       blocks：567496     IO block：4096

before deleting the file "test":
# debugfs -R "stats" /dev/sdb
...
Inode count:              243593216
Block count:              1948728320
Reserved block count:     97436416
Free blocks:              406830314
Free inodes:              151667854
...

deleting the file "test"
# debugfs -R "stats" /dev/sdb
...
Inode count:              243593216
Block count:              1948728320
Reserved block count:     97436416
Free blocks:              406830314
Free inodes:              151667854
...

     Younger
     thx.
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