linux-ext4 - Re: [PATCH] ext4: check for EXT4_MB_HINT_NOPREALLOC is added in ext4_mb_use

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Message-ID: <20100407151714.GP23670@thunk.org>
Date:	Wed, 7 Apr 2010 11:17:14 -0400
From:	tytso@....edu
To:	jing zhang <zj.barak@...il.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	Andreas Dilger <adilger@....com>,
	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH] ext4: check for EXT4_MB_HINT_NOPREALLOC is added in
 ext4_mb_use_preallocated()

On Wed, Apr 07, 2010 at 09:25:53PM +0800, jing zhang wrote:
> From: Jing Zhang <zj.barak@...il.com>
> 
> Date: Wed Apr 7 21:23:48     2010
> 
> Since preallocation may not be require by allocation request, check
> for it in ext4_mb_use_preallocated() seems necessary.

NACK.  If there is a file-specific preallocation that had been created
from a previous allocation (that wasn't completely used up), we want
to use it up, even if we don't want to create any new per-file
preallocations.

						- Ted
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