linux-ext4 - Re: Extended file stat: Splitting file- and fs-specific info?

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Message-Id: <3DA7C6A5-E47C-47D4-BFBB-3E608492BD0B@dilger.ca>
Date:	Thu, 10 May 2012 10:05:28 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	David Howells <dhowells@...hat.com>
Cc:	Andreas Dilger <aedilger@...il.com>,
	Dave Chinner <david@...morbit.com>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"smfrench@...il.com" <smfrench@...il.com>,
	"ben@...adent.org.uk" <ben@...adent.org.uk>,
	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"roland@...k.frob.com" <roland@...k.frob.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
	"samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"libc-alpha@...rceware.org" <libc-alpha@...rceware.org>
Subject: Re: Extended file stat: Splitting file- and fs-specific info?

On 2012-05-10, at 3:23 AM, David Howells wrote:
> Andreas Dilger <aedilger@...il.com> wrote:
>> The main question I have about these fields is what the difference is
>> between st_blksize and st_alloc_blksize?
> 
> I would assume that st_blksize is some ideal I/O size, not the
> allocation block size.

But there are several optimal IO sizes, so unless there is a clear
description of what each of these fields is intended to be used for,
it doesn't make sense to add them in.

> Dave Chinner might be able to answer better as he suggested these
> I/O information fields.
> 
> David


Cheers, Andreas





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