From: Younger Liu <younger.liucn@gmail.com>
Subject: Why does not freeblocks number change after deleting a big file?
Date: Tue, 06 May 2014 11:32:12 +0800
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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=EF=BC=9A"test"
  size=EF=BC=9A290554084       blocks=EF=BC=9A567496     IO block=EF=BC=
=9A4096

before deleting the file "test":
# debugfs -R "stats" /dev/sdb
=2E..
Inode count:              243593216
Block count:              1948728320
Reserved block count:     97436416
=46ree blocks:              406830314
=46ree inodes:              151667854
=2E..

deleting the file "test"
# debugfs -R "stats" /dev/sdb
=2E..
Inode count:              243593216
Block count:              1948728320
Reserved block count:     97436416
=46ree blocks:              406830314
=46ree inodes:              151667854
=2E..

     Younger
     thx.
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