linux-ext4 - Re: How to use new "native 4k sector sized" HDD with ext4

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] [day] [month] [year] [list]

Message-ID: <CAOiN93=zb7nujbZqBWPDO6x4p2ghmsswX-fMd79sZKFc1Bga1g@mail.gmail.com>
Date:	Wed, 31 Oct 2012 11:02:27 +0530
From:	Ashish Sangwan <ashishsangwan2@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	"Theodore Ts'o" <tytso@....edu>, adilger@...ger.ca,
	sandeen@...hat.com, Namjae Jeon <linkinjeon@...il.com>,
	linux-ext4@...r.kernel.org
Subject: Re: How to use new "native 4k sector sized" HDD with ext4

> That's not really correct.  XFS also uses the uses filesystem blocks
> just like ext2/3/4 for almost everything, data and metadata.
>
> However, the XFS journal format has requirements for detecting torn
> writes in journal recovery and hence needs to know the sector size
> of the log device (i.e. the minimum guaranteed atomic IO size). The
> key metadata in each AG (the AG headers) are also sector sized so
> that they don't get corrupted by torn writes, either, so XFS also
> needs to know the sector size of the data device if is using.

This perfectly explains why it makes sense for xfs.mkfs to have sectorsize
option and why this is not required for ext4.
And next time I will keep in mind to include xfs list too in cc while
asking such a question.

Thanks,

Ashish
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html