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	for linux-mtd@lists.infradead.org; Mon, 18 Aug 2008 10:46:36 +0000
Subject: Re: ubifs mount size
From: Artem Bityutskiy <dedekind@infradead.org>
To: dfoley <dfoley@telus.net>
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Date: Mon, 18 Aug 2008 13:45:17 +0300
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Cc: linux-mtd@lists.infradead.org, Adrian Hunter <ext-adrian.hunter@nokia.com>
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Hi,

On Mon, 2008-08-18 at 09:36 +0300, Adrian Hunter wrote:
> 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.
> >=20
> >=20
> > root@tsi-sa2410:~# ubimkvol /dev/ubi1 -N root -s 55MiB
> > Volume ID 0, size 3755 LEBs (57676800 bytes, 55.0 MiB), LEB size 15360=20
> > 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/de=
v
> > ubi1:root                33968         0     31204   0% /mnt/linux2-roo=
t
>=20
> Yes this looks right.  UBIFS doesn't really know how much data can be fit=
ted
> in the file system, so it makes a worst case estimate.

In practice you will be able to fit more than what df shows. I will
write a corresponding FAQ entry which will explain the issue later.

--=20
Best regards,
Artem Bityutskiy (=D0=91=D0=B8=D1=82=D1=8E=D1=86=D0=BA=D0=B8=D0=B9 =D0=90=
=D1=80=D1=82=D1=91=D0=BC)