ramfs always reports filesize in blocks to be 0

Hello!

Subject says it all, inode->i_blocks always 0, in ramfs, and never updated (the only updated thing is inode->i_size).
This breaks at least du(1). Ain't it should count blocks too, so that one can find how much ramfs is consuming in terms of memory by simply issuing du -ks ramfs_mount_point

Bye,
Oleg
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