From: Azat Khuzhin <a3at.mail@gmail.com>
To: Younger Liu <younger.liucn@gmail.com>
Cc: linux-ext4@vger.kernel.org
Subject: Re: Why does not freeblocks number change after deleting a big file?
Date: Tue, 6 May 2014 13:57:48 +0400 [thread overview]
Message-ID: <20140506095748.GD23108@azat> (raw)
In-Reply-To: <536857BC.3010002@gmail.com>
On Tue, May 06, 2014 at 11:32:12AM +0800, Younger Liu wrote:
> 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
Hi,
Seems that you are trying to do this on a mounted partition, and the
super block are not dumped to disk after every write/flush.
You could use statfs(2) instead of debugfs/stats command, or "mount -o
remount /dev/sdb_X_" and after debugfs, this _must_ work only in case
you don't have journal.
For more information you could look into ext4_commit_super().
> ...
>
> Younger
> thx.
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--
Respectfully
Azat Khuzhin
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next prev parent reply other threads:[~2014-05-06 9:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-06 3:32 Why does not freeblocks number change after deleting a big file? Younger Liu
2014-05-06 9:57 ` Azat Khuzhin [this message]
2014-05-06 10:35 ` Lukáš Czerner
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