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Date:	Fri, 20 Apr 2012 12:16:22 +0200
From:	Bernd Schubert <>
To:	"Theodore Ts'o" <>
	Ext4 Developers List <>
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?

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.


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