linux-ext4 - Re: [PATCH, RFC 0/3] Introduce new O_HOT and O

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Date:	Fri, 20 Apr 2012 12:16:22 +0200
From:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	linux-fsdevel@...r.kernel.org,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH, RFC 0/3] Introduce new O_HOT and O_COLD flags

On 04/19/2012 09:20 PM, Theodore Ts'o wrote:
> As I had brought up during one of the lightning talks at the Linux
> Storage and Filesystem workshop, I am interested in introducing two new
> open flags, O_HOT and O_COLD.  These flags are passed down to the
> individual file system's inode operations' create function, and the file
> system can use these flags as a hint regarding whether the file is
> likely to be accessed frequently or not.
>
> In the future I plan to do further work on how ext4 would use these
> flags, but I want to first get the ability to pass these flags plumbed
> into the VFS layer and the code points for O_HOT and O_COLD reserved.
>

Ted, you still remember the directory-block read-ahead patches I sent 
last year for ext4 and which you declined, as it would add another mount 
parameter for ext4?

http://www.digipedia.pl/usenet/thread/11916/24502/#post24502

If an application could use those flags to the file system (and then not 
only ext4, but any file system) to indicate a certain directory is 
important and frequently accessed, it would be simple to update those 
patches to work without another mount option.
And while I updating our FhGFS meta data on disk layout to workaround 
the general problem we, we (and for example Lustre) are still affected 
the object-storage-side.

Thanks,
Bernd

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