linux-ext4 - Re: [PATCH 1/6] xstat: Add a pair of system calls to make extended file stats available

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Message-Id: <066E4E15-FE60-4D1C-9616-4679EE700CF6@dilger.ca>
Date:	Thu, 26 Apr 2012 21:11:21 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Dave Chinner <david@...morbit.com>
Cc:	David Howells <dhowells@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-ext4@...r.kernel.org,
	wine-devel@...ehq.org, kfm-devel@....org, nautilus-list@...me.org,
	linux-api@...r.kernel.org, libc-alpha@...rceware.org
Subject: Re: [PATCH 1/6] xstat: Add a pair of system calls to make extended file stats available

On 2012-04-26, at 6:51 PM, Dave Chinner wrote:
> On Thu, Apr 26, 2012 at 02:32:36PM +0100, David Howells wrote:
>> I wonder if there's a way to make this explicit - or is it something that if the bit isn't set, you can't use the value in st_blksize.
>> I wonder if this value always has to be non-zero to make sure existing
>> stat() doesn't explode.
> 
> More likely it probably needs to be non-zero to prevent applications
> doing division by block size from exploding... ;)

Right, and any application which knows it needs the blocksize should
also be requesting it when using the statxat() (or whatever) syscall.

Cheers, Andreas





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