linux-ext4 - Re: uninit block group/mballoc and fsstress

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Date:	Thu, 11 Oct 2007 01:45:04 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	Avantika Mathur <mathur@...ux.vnet.ibm.com>
Subject: Re: uninit block group/mballoc and fsstress

On Oct 11, 2007  12:26 +0530, Aneesh Kumar K.V wrote:
> Andreas Dilger wrote:
> >On Oct 10, 2007  22:07 +0530, Aneesh Kumar K.V wrote:
> >>I am hitting this with  the below config
> >>
> >>mke2fs -j -I 256 -O lazy_bg $dev
> >
> >Note that "-O lazy_bg" has nothing really to do with the uninit_groups
> >feature.  Also, if you don't have the CFS e2fsprogs patches for
> >uninit_groups then mke2fs creates an invalid filesystem if the journal is
> >large (this was an unrelated bug we fixed while testing uninit_groups).
> >Try running e2fsck right after the above mke2fs and you will likely
> >see errors.
> >
> 
> e2fsprogs found at  
> 
> ftp://ftp.clusterfs.com/pub/lustre/other/e2fsprogs
> 
> sets unint with -O lazy_bg. Is there any other option that i can use to set
> the uninit block group feature ?

Yes, "-O uninit_groups".  Note that while "-O lazy_bg" does set the UNINIT
flags on the groups (this is a COMPAT feature that marks all of the groups
full in the group descriptors), it does NOT handle the inode high watermark
or in-kernel initialization of the bitmaps.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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