linux-kernel - Re: What is Backing device used for?

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Message-ID: <CAC+QLdSa_FsRr-2GO17+OpTvYFF-oKLAquEvBS_yW950RGFoqA@mail.gmail.com>
Date:	Mon, 5 Dec 2011 18:27:49 +0530
From:	Mandeep Sandhu <mandeepsandhu.chd@...il.com>
To:	rohan puri <rohan.puri15@...il.com>
Cc:	Mulyadi Santosa <mulyadi.santosa@...il.com>,
	kernelnewbies@...nelnewbies.org,
	LKML <linux-kernel@...r.kernel.org>, loody <miloody@...il.com>
Subject: Re: What is Backing device used for?

>> > Is there any document which explain what "backing device" used for?

Have a look at the initramfs doc to get brief idea:
http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt

>From what I've understood, is that backing device/store is the device
onto which _committed_ data is actually written. This might be a block
device like a hard-disk, flash mem or even the RAM (used by in-memory
file-systems).

CMIIW.

HTH,
-mandeep
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