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Date: Tue, 18 Nov 2014 12:26:19 +0100
From: Gabriel de Perthuis <g2p.code@gmail.com>
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To: Robert White <rwhite@pobox.com>
CC: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: btrfs filesystem show _exact_ freaking size?
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Le 18/11/2014 11:39, Robert White a écrit :
> Howdy,
> 
> How does one get the exact size (in blocks preferably, but bytes okay)
> of the filesystem inside a partition? I know how to get the partition
> size, but that's not useful when shrinking a partition...

dev_item.total_bytes in brtfs-show-super's output is what you're after.