linux-ext4 - [Bug 15420] EXT4_USE_FOR_EXT23 causes wrong free space calculation on ext2 and ext3

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Message-Id: <201003101236.o2ACaI4a027540@demeter.kernel.org>
Date:	Wed, 10 Mar 2010 12:36:18 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15420] EXT4_USE_FOR_EXT23 causes wrong free space calculation
 on ext2 and ext3

http://bugzilla.kernel.org/show_bug.cgi?id=15420





--- Comment #7 from Thomas Bächler <thomas@...hlinux.org>  2010-03-10 12:36:12 ---
(In reply to comment #5)
> 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.

It is not purely aesthetic, lots of applications abort their operation if space
is supposedly running low.

However, as this doesn't seem to be high priority for anyone here, we should
probably consider disabling EXT4_USE_FOR_EXT23 in our distribution kernel for
the time being.

(In reply to comment #6)
> 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...

Don't see a patch here.

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