Re: [PATCH] expanding truncate

From: Alexander Viro (
Date: Thu Jan 03 2002 - 11:17:56 EST

On Thu, 3 Jan 2002, Oleg Drokin wrote:

> Purpose of this patch is of course not to fill in the datablocks with zeroes.
> The purpose (as applied to reiserfs) is to fill indirect data pointers (that is - pointers to real data blocks)
> with zeroes (and to organize proper in-tree data structure for such pointers).
> As of now such organization and zero-filling is done on a lazy manner at disk-flushing time.
> Unfortunatelly this leads to races in the code.
> I do not know why parts of this code can be needed by other filesystem and why Al Viro put it in generic VFS
> code. (but he can comment on it, I think)

I could, if I would remember doing that... ;-/

        Seriously, it looks like a half-arsed and very old attempt to do common
expanding truncate() for no-holes filesystems. BTW, these days rlimit checks
are done by vmtruncate().

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