linux-kernel - Re: EXPORT_SYMBOL(fat_get

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Message-ID: <20100813175456.GB15024@suse.de>
Date:	Fri, 13 Aug 2010 10:54:56 -0700
From:	Greg KH <gregkh@...e.de>
To:	David Cross <david.cross@...ress.com>
Cc:	hirofumi@...l.parknet.co.jp, linux-kernel@...r.kernel.org
Subject: Re: EXPORT_SYMBOL(fat_get_block)

On Fri, Aug 13, 2010 at 10:45:39AM -0700, David Cross wrote:
> Hello Hirofumi,
> I would like to export this symbol from the vfat code and add this patch
> to the Linux kernel. You are listed as the MAINTAINER for FAT and VFAT.
> As such, I need your approval to do it. 
> The reason that I need to export this symbol is to allow for file based
> DMA in which the file needs to be pre-allocated. The pre-allocated block
> addresses are passed to a DMA engine which then directly transfers the
> data to non-volatile storage.

Also, why do this at the FAT level, and not more correctly at the block
layer level?  What happens if this isn't a FAT partition on the device?

thanks,

greg k-h
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