linux-kernel - Re: Ext2/3 Filesystem Analysis

lists.openwall.net		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-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100609105802.62d2ddce@lxorguk.ukuu.org.uk>
Date:	Wed, 9 Jun 2010 10:58:02 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Yedire, Sandeep" <syedire@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Ext2/3 Filesystem Analysis

> With Ext3:
> Filesystem block at Sector 0 is being updated more frequently at ratio
> of 5.5 to 6 times that of data block.
> Filesystem block(super block copies) are being updated at around
> 1.5times the frequency compared to data block.
> 
> Has anyone come across this kind of behaviour with these filesystems
> on NAND Flash?

ext2/3 are not intended to be used with flash - they do not wear level,
in fact the journal and some other blocks will get very heavily used
compared to other blocks.

See the MTD drivers and related file systems/mapping layers (UBIFS etc)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/