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Date:	Wed, 7 Mar 2012 11:51:30 +1100
From:	Dave Chinner <>
Subject: Re: [RFC] fadvise: add more flags to provide a hint for block

On Mon, Mar 05, 2012 at 08:50:29PM +0800, Zheng Liu wrote:
> Hi list,
> Block allocation is a key component of file system.  Every file systems try to
> improve the performance with optimizing the block allocation of a file.  But no
> matter what file system does, it just guesses what the user expects.  Thus, it
> is not very accurate.  fadvise(2) provides a method to let the user to give a
> hint to file system.  However, until now, only few flags are provided.  So we
> can provide more flags to tell file system how to allocate the blocks for a
> file.
> For example:
> we can add these flags into fadvise(2):



Allocation can't be optimised as the read pattern cannot be defined.




chattr +a


Dave Chinner
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