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	for linux-mtd@lists.infradead.org; Wed, 23 Apr 2008 15:33:20 +0000
Subject: Re: JFFS2 powerfail ?
From: Artem Bityutskiy <dedekind@infradead.org>
To: "Vellemans, Noel" <Noel.Vellemans@visionBMS.com>
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Date: Wed, 23 Apr 2008 18:33:32 +0300
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Hi,

On Wed, 2008-04-23 at 17:26 +0200, Vellemans, Noel wrote:
> All seems to go quite well, but from time to time after pressing the RESE=
T button (of powerfail), I get CRC-errors , the numer of warnings increment=
s typically each time I powerfail.
> =20
> JFFS2 notice: (791) check_node_data: wrong data CRC in data node at 0x010=
62120: read 0xfac2f85a, calculated 0x9ac0c6d1.
> JFFS2 notice: (791) check_node_data: wrong data CRC in data node at 0x002=
b9bf0: read 0x9f182fab, calculated 0x4ad20e5f.
> JFFS2 notice: (791) check_node_data: wrong data CRC in data node at 0x002=
b5d60: read 0x79a2a9d8, calculated 0x35234c9a.

This is normal. It's just half-written nodes which correspond to the
last writes you made before the power cut. They are harmless, although
spam the syslog. JFFS2 cannot remove them straight after mount, so they
may accumulate. Which means each time you see corruption messages for
the previous unclean reboots. However, the corrupted nodes will go away
some time, when JFFS2 decides to garbage-collect corresponding
eraseblocks. IOW, don't worry, this is a feature.

--=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)