diff options
| author | Tejun Heo <tj@kernel.org> | 2013-01-09 17:05:10 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-01-09 17:05:10 +0100 |
| commit | 3c547865902e9fc30dc15941f326fd8039c6628d (patch) | |
| tree | e86d926e86258cfc69d6665e28551fa14267634e /block/scsi_ioctl.c | |
| parent | blkcg: cosmetic updates to blkg_create() (diff) | |
| download | linux-3c547865902e9fc30dc15941f326fd8039c6628d.tar.xz linux-3c547865902e9fc30dc15941f326fd8039c6628d.zip | |
blkcg: make blkcg_gq's hierarchical
Currently a child blkg (blkcg_gq) can be created even if its parent
doesn't exist. ie. Given a blkg, it's not guaranteed that its
ancestors will exist. This makes it difficult to implement proper
hierarchy support for blkcg policies.
Always create blkgs recursively and make a child blkg hold a reference
to its parent. blkg->parent is added so that finding the parent is
easy. blkcg_parent() is also added in the process.
This change can be visible to userland. e.g. while issuing IO in a
nested cgroup didn't affect the ancestors at all, now it will
initialize all ancestor blkgs and zero stats for the request_queue
will always appear on them. While this is userland visible, this
shouldn't cause any functional difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Diffstat (limited to 'block/scsi_ioctl.c')
0 files changed, 0 insertions, 0 deletions