linux-kernel - RE: Linux 3.1-rc1 (nfs/pnfs and drivers/md)

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Message-ID: <F19688880B763E40B28B2B462677FBF805BF0EACC4@MX09A.corp.emc.com>
Date:	Thu, 11 Aug 2011 02:21:17 -0400
From:	<tao.peng@....com>
To:	<hch@...radead.org>
CC:	<torvalds@...ux-foundation.org>, <rdunlap@...otime.net>,
	<bergwolf@...il.com>, <Trond.Myklebust@...app.com>,
	<linux-raid@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-nfs@...r.kernel.org>
Subject: RE: Linux 3.1-rc1 (nfs/pnfs and drivers/md)

> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Thursday, August 11, 2011 2:07 PM
> To: Peng, Tao
> Cc: torvalds@...ux-foundation.org; rdunlap@...otime.net; bergwolf@...il.com;
> Trond.Myklebust@...app.com; linux-raid@...r.kernel.org;
> linux-kernel@...r.kernel.org; linux-nfs@...r.kernel.org
> Subject: Re: Linux 3.1-rc1 (nfs/pnfs and drivers/md)
> 
> Note that the object layout also effectively needs the block layer.
> 
That is taken care of by PNFS_OBJLAYOUT depending on SCSI_OSD_ULD.

The dependency chain for PNFS_OBJLAYOUT on BLOCK is:
PNFS_OBJLAYOUT-> SCSI_OSD_ULD -> SCSI_OSD_INITIATOR -> SCSI-> BLOCK

With the patch, if CONFIG_BLOCK is not set, pnfs file layout can still be built.

Thanks,
Tao

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