On Mon, Feb 03, 2020 at 07:50:07PM +0000, Greg KH wrote:

On Mon, Feb 03, 2020 at 07:29:49PM +0100, David Sterba wrote:

...

Hi,

I'd like to ask the stable team to add the patch

d55966c4279bfc6a0cf0b32bf13f5df228a1eeb6 btrfs: do not zero f_bavail if we have available space

to 5.4 and 5.5 stable trees as early as possible.

I'm not familiar with your release schedules but I saw the large patch sets for review and I hope I could squeeze that one in the upcoming release.

The commit fixes a problem in 'df' that causes false alerts and there are a lot of users hitting it. The patch itself is a one-liner, but with a high impact on usability.

I've snuck it in now, and if you could provide a backport for 4.4.y, that would be great as I think it's also needed there.

To help my OCD I snuck it in to 4.4 as well, it just depended on ae02d1bd0707 ("btrfs: fix mixed block count of available space") which is a fix on it's own.