linux-ext4 - Reserved GDT inode: blocks vs extents

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Date:	Fri, 19 Sep 2014 11:54:39 -0400
From:	TR Reardon <thomas_reardon@...mail.com>
To:	linux-ext4@...r.kernel.org
Subject: Reserved GDT inode: blocks vs extents

Hello all: there's probably a good reason for this, but I'm wondering why inode#7 (reserved GDT blocks) is always created with a block map rather than extent? 

 [see ext2fs_create_resize_inode()]

Would changing this to extent resolve problem of resize_inode and 64bit / >16TB filesystems?