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Date:	Thu, 31 May 2007 17:01:08 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Theodore Tso <tytso@....edu>
CC:	Andreas Dilger <adilger@...sterfs.com>,
	Rupesh Thakare <rupesh@...sterfs.com>,
	linux-ext4@...r.kernel.org, Kalpak Shah <kalpak@...sterfs.com>
Subject: Re: [RFC] store RAID stride in superblock

Theodore Tso wrote:
> And has anyone investigated where there are
> magic ioctl's or libdevmapper APi's so we can get the RAID parameters
> automatically?  If so, patches so that mke2fs can get the information
> automatically (as opposed to forcing the user to have to specify lots
> of annoying options) would be most welcome....

xfsprogs has a libdisk which does this for evms, lvm, md, dm, and xvm(!)

see for example md_get_subvol_stripe() in xfsprogs.

-Eric

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