lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 30 Apr 2012 11:19:31 -0600
From:	Daniel Drake <>
Subject: Determining if an ext4 fs uses the whole partition


OLPC has started using ext4 online resizing to grow our filesystems to
use the whole SD card on first boot - something we never did before.
Working very nicely, thanks!

I'm trying to simplify/improve the scripts involved in doing this.

How can I programatically check if an ext4 fs already fills its
partition, or if it has room to grow?

The numbers produced by dumpe2fs (e.g. block count) or "df" don't seem
to exactly line up with the sizes produced by fdisk.
One easy solution, if possible, would be to find out the number of the
last sector used by the filesystem. I could then very easily compare
this to the "end" information found in sysfs for the partition. Then I
can make the decision on whether to grow or not.

To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists