linux-kernel - How to mount filesystem from RAM ?

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Message-ID: <BANLkTinX7cknxL619o6R=0foeQMpTbRK-Q@mail.gmail.com>
Date:	Tue, 19 Apr 2011 15:02:15 +0900
From:	Jongman Heo <jongman.heo@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: How to mount filesystem from RAM ?

Dear all,

I have a flash device and it will store cramfs or squashfs filesystem
in one of its partition.

I can't directly mount it using normal way, for example, "mount
/dev/mtdblock0 /mnt", due to some other constraint.
(And initrd is not an option for me.)

Instead, I can load the data from the partition into RAM, which means
whole filesystem data is copied into some location of RAM. ( I know
the physical address, for the data to be loaded.) This copy operation
is done by bootloader side, not in Linux.

In this case, how can I mount the filesystem from RAM? Is there any
way to do this?

And I think the memory location of filesystem data should be reserved
not to be used by Linux kernel and user space application, am I right?

Thanks in advance,
Jongman.
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