Kernel Log: Coming in 3.2 (Part 2) – Filesystems

“For 3.2, Ext filesystem developer Theodore ‘tytso’ Ts’o has
removed an old algorithm for allocating memory blocks (Ext3, Ext4).
He has also made a number of changes which should cause Ext4 to
react better if users specify mutually incompatible mount options.
In a recent presentation at LinuxCon Europe 2011, Ts’o noted that
Ext4 is stable with a standard configuration (e.g. standard mount
options with or without journal), but that problems were possible
or even likely with unusual mount options and mount option
combinations (e.g. saving the journal on another drive) as these
had barely been tested.

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