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From: Eric Sandeen <sandeen@sandeen.net>
To: Smit Shah <getsmit@gmail.com>
Cc: linux-xfs@oss.sgi.com
Subject: Re: XFS Preallocate using ALLOCSP
Date: Mon, 15 Jun 2009 22:34:23 -0500	[thread overview]
Message-ID: <4A3712BF.7030101@sandeen.net> (raw)
In-Reply-To: <24042506.post@talk.nabble.com>

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 

ALLOCSP simply writes 0s to a file.... you may as well do it using posix
calls, as a normal user, I think.

-Eric

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  parent reply	other threads:[~2009-06-16  3:33 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-16  0:18 XFS Preallocate using ALLOCSP Smit Shah
2009-06-16  2:00 ` Smit Shah
2009-06-16  3:34 ` Eric Sandeen [this message]
2009-06-16  6:44   ` Smit Shah
2009-06-16  7:34     ` Smit Shah
2009-06-16 15:16     ` Eric Sandeen
2009-06-16 16:42       ` Felix Blyakher
2009-06-16 17:28         ` Smit Shah
2009-06-16 17:32           ` Eric Sandeen
2009-06-16 21:38             ` Smit Shah
2009-06-17  1:04               ` Michael Monnerie
2009-06-16 17:41           ` Felix Blyakher
2009-06-16 21:42             ` Smit Shah
2009-06-16 22:05               ` Eric Sandeen
2009-06-16 22:32                 ` Felix Blyakher
2009-06-16 22:19               ` Smit Shah
2009-06-16 22:26               ` Felix Blyakher

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