From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
To: Lei Yang <lya755@ece.northwestern.edu>, linux-kernel@vger.kernel.org,
       kernelnewbies <kernelnewbies@nl.linux.org>
Subject: Re: set blksize of block device
Date: Thu, 28 Oct 2004 09:09:20 +0300
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Cc: Lei Yang <lya755@ece.northwestern.edu>
References: <417FE6A8.5090803@ece.northwestern.edu> <417FE937.1040304@ece.northwestern.edu> <41804F04.4000300@ece.northwestern.edu>
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> >> I am learning block device drivers and have a newbie question. Given 
> >> a block device, is there anyway that I could set its block size? For 
> >> example, I want to write a block device driver that will work on an 
> >> existing block device.  In this driver, I want block size smaller. 
> >> (The idea looks confusing but I could explain if anybody is 
> >> interested :- )  However,  typically the block size is 1KB, now I 
> >> want to set it to 512 or 256.  Can I do it?

256 - no way if hardware can do only 512-byte writes.

You need read-modify-write for this.
--
vda

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