On Wed, May 11, 2016 at 11:28:04AM +0200, Paolo Valente wrote: > When a bio is cloned, the newly created bio must be associated with > the same blkcg as the original bio (if BLK_CGROUP is enabled). If > this operation is not performed, then the new bio is not associated > with any group, and the group of the current task is returned when > the group of the bio is requested. > > Depending on the cloning frequency, this may cause a large > percentage of the bios belonging to a given group to be treated > as if belonging to other groups (in most cases as if belonging to > the root group). The expected group isolation may thereby be broken. > > This commit adds the missing association in bio-cloning functions. > > Signed-off-by: Paolo Valente <[email protected]> > Reviewed-by: Nikolay Borisov <[email protected]>
Acked-by: Tejun Heo <[email protected]> It prolly should also have the following tags Fixes: da2f0f74cf7d ("Btrfs: add support for blkio controllers") Cc: [email protected] # v4.3+ Thanks. -- tejun
