On 7/2/20 8:23 AM, Nikolay Borisov wrote:
Since BTRFS uses a private bdi it makes sense to create a link to this bdi under /sys/fs/btrfs/<UUID>/bdi. This allows size of read ahead to be controlled. Without this patch it's not possible to uniquely identify which bdi pertains to which btrfs filesystem in the fase of multiple btrfs filesystem. Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx>
Was confused why we needed to make sure the link existed before removing it, since other things sysfs is smart enough to figure out. Apparently it has a WARN_ON() if the parent isn't initialized, so the check is necessary, albeit annoying.
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx> Thanks, Josef
