linux-ext4 - [RFC] EXT_MAX_BLOCK for >= 16TB fs

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Date:	Mon, 07 Jul 2008 22:25:32 +0530
From:	Girish Shilamkar <Girish.Shilamkar@....COM>
To:	Ext4 Mailing List <linux-ext4@...r.kernel.org>
Cc:	adilger@....COM, Theodore Tso <tytso@....edu>
Subject: [RFC] EXT_MAX_BLOCK for >= 16TB fs

Hi,
	The magic constant EXT_MAX_BLOCK = 0xffffffff in extents code is used
in some places to return "invalid block number", and to set the extent
length = "whole file" in other places.
	So with >= 16 TB fs we would prefer to use it differently. We can have
EXT_UNSET_BLOCK = 1 to indicate "invalid block number" as it will never
be valid block for allocation. And for "whole file" usecase we can
continue using current EXT_MAX_BLOCK

Regards,
Girish



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