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

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





--- Comment #16 from Jan Kara <jack@suse.cz>  2010-03-11 16:10:46 ---
As for comment #13 - I fully agree with Ted. When admin does "mount -t ext3
...", I think we should give him as close behavior to ext3 as possible by the
principle of the least surprise - and that means nodelalloc. If user wishes
better performance etc, he can always mount the filesystem as ext4 explicitely.
Also I remember some discussions with KDE guys when they were at some point
considering detecting filesystem type and avoid doing fsync if it was ext3 -
hopefully, I convinced them not to do it but I bet someone else had the same
idea and actually implemented it. Not that I'd have too much pity with broken
applications but I prefer to avoid breaking them silently like this...

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