From: Jamie Lokier <jamie@shareable.org>
To: Iwo Mergler <iwo@call-direct.com.au>
Cc: linux-mtd@lists.infradead.org, joern@logfs.org,
dwmw2@infradead.org, Alexey Korolev <akorolev@infradead.org>,
Matthieu CASTET <matthieu.castet@parrot.com>
Subject: Re: [BUG] JFFS2 power loss recovery issues on NAND
Date: Wed, 18 Jun 2008 13:19:36 +0100 [thread overview]
Message-ID: <20080618121936.GD305@shareable.org> (raw)
In-Reply-To: <48584DE9.3000709@call-direct.com.au>
Iwo Mergler wrote:
> Forgive my ignorance - does that mean that not everything in JFFS2 is
> CRC protected?
I think every _individual_ record is CRC protected in JFFS2
_But_ that doesn't always detect file corruption. If JFFS2 records
don't match their CRC, they are treated as if not there.
If there's corrupt data records, that causes holes in files. There's
no I/O error reported to the application, just blocks of zero bytes.
There's no mechanism in JFFS2 to detect that. It requires checksums
at a higher level than individual records.
-- Jamie
next prev parent reply other threads:[~2008-06-18 12:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-10 13:57 [BUG] JFFS2 power loss recovery issues on NAND Alexey Korolev
2008-06-17 1:03 ` Iwo Mergler
2008-06-17 8:13 ` Matthieu CASTET
2008-06-17 9:24 ` Jörn Engel
2008-06-17 16:00 ` Alexey Korolev
2008-06-17 16:57 ` Jörn Engel
2008-06-17 23:51 ` Iwo Mergler
2008-06-18 12:19 ` Jamie Lokier [this message]
2008-06-18 12:33 ` David Woodhouse
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