From mboxrd@z Thu Jan  1 00:00:00 1970
From: viro@parcelfarce.linux.theplanet.co.uk
Subject: Re: What calls setattr?
Date: Tue, 11 Nov 2003 01:57:33 +0000
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To: Charles Manning <manningc2@actrix.gen.nz>
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On Tue, Nov 11, 2003 at 02:51:30PM +1300, Charles Manning wrote:
> I'm trying to test a change to setattr in YAFFS. In particular, I'm trying to 
> test the use of ATTR_SIZE when the size of the file is reduced 
> 
> I can't find the process-space system call that causes this to be called.(eg. 
> file is 2kB and I want to cut it back to 1kB).
> 
> Help me plz.

man truncate

(plus a bunch of related syscalls, plus truncation-to-zero when you do
open() with O_TRUNC, plus nfsd handling corresponding requests...)