How does ext2 implement sparse files?

[Lars Noschinski]

Hello!

For an university project, we had to write a toy filesystem (ext2-like),
for which I would like to implement sparse file support. For this, I
digged through the ext2 source code; but I could not find the point,
where ext2 detects holes.

As far as I can see from fs/buffer.c, an hole is a buffer_head which is
not mapped, but uptodate. But I cannot find a relevant source line,
where ext2 makes usage of this information.

Any hints would be greatly appreciated,
    Lars.

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