linux-ext4 - Re: 16 TB filesystem limit on 32bit machine

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Message-ID: <4F42B86B.60706@ubuntu.com>
Date:	Mon, 20 Feb 2012 16:17:31 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	Rabeeh Khoury <rabeeh3000@...il.com>, linux-ext4@...r.kernel.org
Subject: Re: 16 TB filesystem limit on 32bit machine

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On 2/20/2012 11:50 AM, Eric Sandeen wrote:
> fs metadata is mapped into an address space, IIRC, so can't be
> addressed past 2^32 pages.  Also, mkfs can't do buffered IO to the
> device past 16T (it is writing to a device _file_) and ditto for
> e2fsck.

But the file is only used for open(), after that the IO is handled by
the correct device driver, which handles 64 bit offsets ( when you
have CONFIG_LBDAF on ).  So if you can change the page cache index
size ( and it doesn't blow up ) this should work fine.

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