Re: Unexpected behavior involving file attributes and snapshots.

["Austin S. Hemmelgarn" <ahferroin7@gmail.com>]

On 2017-02-14 11:07, Chris Murphy wrote:
> On Tue, Feb 14, 2017 at 8:30 AM, Austin S. Hemmelgarn
> <ahferroin7@gmail.com> wrote:
>> I was just experimenting with snapshots on 4.9.0, and came across some
>> unexpected behavior.
>>
>> The simple explanation is that if you snapshot a subvolume, any files in the
>> subvolume that have the NOCOW attribute will not have that attribute in the
>> snapshot.  Some further testing indicates that this is the only file
>> attribute that isn't preserved (I checked all the chattr flags that BTRFS
>> supports).
>
> Huh, I can't reproduce this with 4.9.8 or 4.10rc7. systemd sets
> journal files with chattr +C, and I do manual snapshots of rootfs
> periodically, and those snapshots have journal files that have +C
> still set.
>
Just tested on a different filesystem, and I'm not seeing it there 
either, I'll take a closer look at the FS I saw this on and see if I can 
figure out what's up.