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Date: Mon, 18 Aug 2008 09:36:29 +0300
From: Adrian Hunter <ext-adrian.hunter@nokia.com>
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To: dfoley <dfoley@telus.net>
Subject: Re: ubifs mount size
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dfoley wrote:
> Does this look right (info below) ?
> I create a 55MiB volume, but df only shows 33968KiB
> This is linux-2.6.24.4. I've also used linux-2.6.27-rc3.
> 
> 
> root@tsi-sa2410:~# ubimkvol /dev/ubi1 -N root -s 55MiB
> Volume ID 0, size 3755 LEBs (57676800 bytes, 55.0 MiB), LEB size 15360 
> bytes (15.0 KiB), dynamic, name "root", alignment 1
> root@tsi-sa2410:~# mount -t ubifs ubi1:root /mnt/linux2-root/
> UBIFS: default file-system created
> UBIFS: background thread "ubifs_bgt1_0" started, PID 930
> UBIFS: mounted UBI device 1, volume 0, name "root"
> UBIFS: file system size: 57292800 bytes (55950 KiB, 54 MiB, 3730 LEBs)
> UBIFS: journal size: 2872320 bytes (2805 KiB, 2 MiB, 187 LEBs)
> UBIFS: default compressor: LZO
> UBIFS: media format 4, latest format 4
> root@tsi-sa2410:~# df
> Filesystem           1k-blocks      Used Available Use% Mounted on
> rootfs                    8059      5284      2366  69% /
> /dev/root                 8059      5284      2366  69% /
> /dev/root                 8059      5284      2366  69% /dev/.static/dev
> ubi1:root                33968         0     31204   0% /mnt/linux2-root

Yes this looks right.  UBIFS doesn't really know how much data can be fitted
in the file system, so it makes a worst case estimate.