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Re: adding linux syscall fallocate
> You don't have to know where to write. Strictly speaking you only need
> to know that the space is reserved.
Strictly speaking, yes. But callers of fallocate may expect that the space
is not only available, mut more-or-less contiguous---as if zeroes had actually
been written. I.e., when demultiplexing a AV file, fallocate the video output,
fallocate the audio output, write intertwined and expect a disc layout similar
to having written all the video at once and then all the audio at once.
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