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Subject: Re: upgrading kernel 3.13 to 3.16
To: Vytautas D <vytdau@gmail.com>, Btrfs BTRFS <linux-btrfs@vger.kernel.org>
References: <CAO5K3OdzXgXpSNqCOqvMwVgQWiEF9p91ymB+uXjFRCCK24QWZg@mail.gmail.com>
From: "Austin S. Hemmelgarn" <ahferroin7@gmail.com>
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Date: Fri, 26 Feb 2016 07:14:36 -0500
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On 2016-02-26 05:50, Vytautas D wrote:
> Hi all,
>
> Are there any known issues upgrading btrfs running ubuntu kernel 3.13
> to 3.16 ? System was once converted from ext4 using btrfs-convert (
> btrfs-progs 3.17 ).
>
> The commit that worries me is following:
> *  Btrfs: incompatible format change to remove hole extents (+373/-56)
> ( http://linux-btrfs.vger.kernel.narkive.com/syNRZbHS/patch-btrfs-incompatible-format-change-to-remove-hole-extents-v3#post1
> )
>
> would this block me from reverting system with a snapshot back to kernel 3.13 ?
> After upgrade would the system continue writing more metadata ?
That particular commit also added a flag to control whether or not newly 
written metadata uses that feature.  As long as you don't manually 
enable this flag, you should be perfectly fine WRT that change.