linux-ext4 - Re: A tool that allows changing inode table sizes

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Date:	Fri, 28 Feb 2014 01:12:04 +0400
From:	"Vitaliy Filippov" <vitalif@...rcmc.ru>
To:	linux-ext4@...r.kernel.org, "Phillip Susi" <psusi@...ntu.com>
Subject: Re: A tool that allows changing inode table sizes

> Wow!  That is quite a project, and this patch manager sounds very
> nice.  Good work!

Thanks :)

Since that initial post I've also implemented a simple 'patchbd' kernel  
module - http://svn.yourcmc.ru/viewvc.py/vitalif/trunk/sftl/patchbd.c  
(don't look at sftl*, it's some old academic try to implement a software  
FTL); it now has different format of patch files, so patch_io_manager is  
also rewritten... It's still quite a hack of course: block maps for  
example are logically stored twice - once explicitly and once in the  
underlying FS extent tree... But it's working, opposed to an LVM snapshot  
than made my system hang when being actively written; it's fast since  
there are no additional kernel threads or work queues (except loop thread  
of course), it just proxies bio's to other devices... and you can finally  
mount and test a 'patched' block device... :)

Also I've done testing on a real harddrive (that 3TB one) and actually  
fixed one bug after that testing :) also I've left the patch block device  
mounted for a ~week, ... and the patch file had grown up to 20GB. Then  
I've applied it with e2patch. Everything went OK. :)

What I'll do next is trying to actually port it into resize2fs...

-- 
With best regards,
   Vitaliy Filippov
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