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List:       linux-btrfs
Subject:    About btrfs chunk tree backups
From:       Miao Xie <miaox () cn ! fujitsu ! com>
Date:       2011-03-03 8:58:19
Message-ID: 4D6F58CC.9030003 () cn ! fujitsu ! com
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Hi, Chris and Josef

Recently, I am interested in chunk tree backups, which is described in
Project ideas web. But I found it is hard to be implemented.

The description said "make the mappings discoverable via a block device
scan so that we can recover from corrupted chunk trees", I think it is
hard to find the boundary of each stripe, which is the constituent of
the chunks, via a block device scan according to the current on-disk data
structures. And besides that, even though we find the stripes of each
chunks, we still don't know the order of the stripes in one chunk. So
I think chunk tree backups is hard to be implemented.

Maybe I made some mistakes in understanding this project idea?

Thanks
Miao

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