path: root/kernel/fork.c
diff options
authorLinus Torvalds <>2015-09-02 08:04:23 -0700
committerLinus Torvalds <>2015-09-02 08:04:23 -0700
commit8bdc69b764013a9b5ebeef7df8f314f1066c5d79 (patch)
tree335dcb29c9ba06142917121d551575d360eca63e /kernel/fork.c
parent76ec51ef5edfe540bbc3c61b860f88deb8e6a37b (diff)
parent20f1f4b5ffb870631bf4a4e7c7ba10e3528ae6a6 (diff)
Merge branch 'for-4.3' of git://
Pull cgroup updates from Tejun Heo: - a new PIDs controller is added. It turns out that PIDs are actually an independent resource from kmem due to the limited PID space. - more core preparations for the v2 interface. Once cpu side interface is settled, it should be ready for lifting the devel mask. for-4.3-unified-base was temporarily branched so that other trees (block) can pull cgroup core changes that blkcg changes depend on. - a non-critical idr_preload usage bug fix. * 'for-4.3' of git:// cgroup: pids: fix invalid get/put usage cgroup: introduce cgroup_subsys->legacy_name cgroup: don't print subsystems for the default hierarchy cgroup: make cftype->private a unsigned long cgroup: export cgrp_dfl_root cgroup: define controller file conventions cgroup: fix idr_preload usage cgroup: add documentation for the PIDs controller cgroup: implement the PIDs subsystem cgroup: allow a cgroup subsystem to reject a fork
Diffstat (limited to 'kernel/fork.c')
1 files changed, 15 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 2b1a61cddc19..03aa2e6de7a4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1246,6 +1246,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
int retval;
struct task_struct *p;
+ void *cgrp_ss_priv[CGROUP_CANFORK_COUNT] = {};
if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
return ERR_PTR(-EINVAL);
@@ -1518,6 +1519,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->task_works = NULL;
+ * Ensure that the cgroup subsystem policies allow the new process to be
+ * forked. It should be noted the the new process's css_set can be changed
+ * between here and cgroup_post_fork() if an organisation operation is in
+ * progress.
+ */
+ retval = cgroup_can_fork(p, cgrp_ss_priv);
+ if (retval)
+ goto bad_fork_free_pid;
+ /*
* Make it visible to the rest of the system, but dont wake it up yet.
* Need tasklist lock for parent etc handling!
@@ -1553,7 +1564,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
- goto bad_fork_free_pid;
+ goto bad_fork_cancel_cgroup;
if (likely(p->pid)) {
@@ -1595,7 +1606,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
- cgroup_post_fork(p);
+ cgroup_post_fork(p, cgrp_ss_priv);
if (clone_flags & CLONE_THREAD)
@@ -1605,6 +1616,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
return p;
+ cgroup_cancel_fork(p, cgrp_ss_priv);
if (pid != &init_struct_pid)