From: Roland PJ <roland@rolandpj.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: Re: device mapper integrated loops - and one more year !
Date: Tue, 21 Nov 2006 23:55:27 +0200 [thread overview]
Message-ID: <456375CF.10006@rolandpj.com> (raw)
In-Reply-To: <45636B89.7080407@redhat.com>
Hi Bryn
Just to avoid confusion, this is a different Roland from the original query.
Looking at
http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-loop.patch
+ if (!cur_block)
+ goto bad_bmap;
...
+bad_bmap:
+ DMERR("Loopfile has holes");
+ dump_extent_map(map);
Does this mean that dm-loop does not support sparse loop-back files?
Also, it seems that the approach with dm-loop is that you sniff the (current?) file mapping onto its underlying block device. What happens if the loopback file is modified, or the file system hosting the loopback file does some re-arranging? (I might be way off-tack here - this was a first impression of the code).
I'd be interested in comparing dm-loop to vanilla loop which we currently use.
Regards
Roland #2
>
>
next prev parent reply other threads:[~2006-11-21 21:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-19 11:30 device mapper integrated loops - and one more year ! devzero
2006-11-21 21:11 ` Bryn M. Reeves
2006-11-21 21:55 ` Roland PJ [this message]
2006-11-21 23:20 ` Bryn M. Reeves
2006-11-22 8:29 ` Roland Paterson-Jones
2006-11-22 21:37 ` Bryn M. Reeves
2006-11-23 11:15 ` Roland Paterson-Jones
-- strict thread matches above, loose matches on Subject: below --
2007-01-20 14:57 devzero
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