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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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