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Re: XFS Preallocate using ALLOCSP

To: linux-xfs@xxxxxxxxxxx
Subject: Re: XFS Preallocate using ALLOCSP
From: Smit Shah <getsmit@xxxxxxxxx>
Date: Mon, 15 Jun 2009 19:00:51 -0700 (PDT)
In-reply-to: <24042506.post@xxxxxxxxxxxxxxx>
References: <24042506.post@xxxxxxxxxxxxxxx>
Ok i did the first part i.e preallocation using xfsctl() by using
setresgid().
But still is there some way this option could be incorporated in the
fallocate system call.

Smit Shah wrote:
> 
> Hi, 
> 
> I wanted to preallocate the file using the ALLOCSP so that the
> preallocated space is zeroed out. Hence i used the xfsctl but the problem
> is that i cannot execute  it as a non-root user.  So i tried using
> fallocate but when i saw the xfs implementation of kernel it uses the
> RESVP cmd and  since the unwritten flag is set i am assuming that the
> performance of writing to the preallocated space will suffer because of
> the metadata updates. So is there a way to preallocate using ALLOCSP as a
> non-root user or else i would be required to modify the kernel ??
> 
> TIA, 
> Smit 
> 

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