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From: "Lluís Batlle i Rossell" <viric@viric.name>
To: Btrfs mailing list <linux-btrfs@vger.kernel.org>
Subject: Resize, off by 1024 bytes
Date: Mon, 24 Sep 2012 21:43:03 +0200	[thread overview]
Message-ID: <20120924194303.GA1972@vicerveza.homeunix.net> (raw)

Hello,

I wanted to resize my filesystem to 512MiB less. I had created the btrfs
after I had set the partitions some days ago, and it was like this:
# cat /sys/class/block/sda1/size
234436482

Getting in bytes:
234436482*512 = 120031478784

I run:
# btrfs fi resize -512m /

And I see in dmesg:
btrfs: new size for /dev/sda1 is 119494606848

But that's not the previous size - 512MiB. It is:
120031478784 - 119494606848 = 536871936 = 512*1024*1024 + 1024

So, there is an 'off by +1024'. I shrinked the partition to +1024 bytes bigger
than would be by subtracting 512MiB, just in case.

What is that off by 1024?

This is 3.5.4.

Regards,
Lluís.

                 reply	other threads:[~2012-09-24 19:43 UTC|newest]

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