From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15420] EXT4_USE_FOR_EXT23 causes wrong free space calculation
on ext2 and ext3
Date: Wed, 10 Mar 2010 12:25:31 GMT
Message-ID: <201003101225.o2ACPVkg024848@demeter.kernel.org>
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http://bugzilla.kernel.org/show_bug.cgi?id=15420
--- Comment #6 from Jan Kara 2010-03-10 12:25:21 ---
> http://bugzilla.kernel.org/show_bug.cgi?id=15420
>
>
> Theodore Tso changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |tytso@mit.edu
>
>
>
>
> --- Comment #5 from Theodore Tso 2010-03-10 03:12:30 ---
> This sounds like the block reservation code for delayed allocation is
> over-aggressive about estimating how many blocks are need for the indirect
> blocks in the case of indirect-mapped inodes (which would be what you get when
> mounting an ext2 filesystem using the ext4 file system driver).
>
> This should be an aesthetic issue only, but it would be nice to have this be
> fixed.
Since bugzilla seems to be down now, I'll reply by email:
Won't it make sence to use 'nodelalloc' by default when ext4 driver is used
for ext2 or ext3 filesystem? Because delayed allocation has some implications
people need not expect - like the overestimation of needed blocks, or changed
semantics of ordered data mode etc...
So something like the patch below?
Honza
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