help regarding ext4 extend and multiblock allocation

[Swapnil Gaikwad <swapnilgaik72@xxxxxxxxx>]

How the extend is different from block allocation?

How it is implemented in ext4?

How helpful the multiblock allocation in ext4?

Is there is some special cases than ext3 that handled in ext4 for above. 

--
    Regards,

Swapnil Gaikwad.

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