linux-ext4 - Re: [RFC] basic delayed allocation in VFS

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Date:	Thu, 26 Jul 2007 17:17:27 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Alex Tomas <alex@...sterfs.com>
CC:	ext4 development <linux-ext4@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC] basic delayed allocation in VFS



Alex Tomas wrote:
> Good day,
> 
> please review ...
> 
> thanks, Alex
> 
> 
> basic delayed allocation in VFS:
> 
>  * block_prepare_write() can be passed special ->get_block() which
>    doesn't allocate blocks, but reserve them and mark bh delayed
>  * a filesystem can use mpage_da_writepages() with other ->get_block()
>    which doesn't defer allocation. mpage_da_writepages() finds all
>    non-allocated blocks and try to allocate them with minimal calls
>    to ->get_block(), then submit IO using __mpage_writepage()
> 

I missed this patch when looking at the ext4 patches. Can we mark related
patch as [ PATCH 1/2 ] so that we know that another patch is going to follow.

-aneesh
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