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| author | Li Zefan <lizefan@huawei.com> | 2013-01-24 14:30:22 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-01-24 12:05:17 -0800 |
| commit | fe1c06ca7523baa668c1eaf1e1016fa64753c32e (patch) | |
| tree | 25a86fc2be7a9c155bb490332696b4228964207d /kernel/cgroup.c | |
| parent | b5d646f5d5a135064232ff3a140a47a5b84bc911 (diff) | |
| download | lwn-fe1c06ca7523baa668c1eaf1e1016fa64753c32e.tar.gz lwn-fe1c06ca7523baa668c1eaf1e1016fa64753c32e.zip | |
cgroup: initialize cgrp->dentry before css_alloc()
With this change, we're guaranteed that cgroup_path() won't see NULL
cgrp->dentry, and thus we can remove the NULL check in it.
(Well, it's not strictly true, because dummptop.dentry is always NULL
but we already handle that separately.)
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 8da9048078c5..a04932281bc9 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1767,7 +1767,7 @@ int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen) rcu_lockdep_assert(rcu_read_lock_held() || cgroup_lock_is_held(), "cgroup_path() called without proper locking"); - if (!dentry || cgrp == dummytop) { + if (cgrp == dummytop) { /* * Inactive subsystems have no dentry for their root * cgroup @@ -4153,6 +4153,9 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, init_cgroup_housekeeping(cgrp); + dentry->d_fsdata = cgrp; + cgrp->dentry = dentry; + cgrp->parent = parent; cgrp->root = parent->root; cgrp->top_cgroup = parent->top_cgroup; @@ -4190,8 +4193,6 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, lockdep_assert_held(&dentry->d_inode->i_mutex); /* allocation complete, commit to creation */ - dentry->d_fsdata = cgrp; - cgrp->dentry = dentry; list_add_tail(&cgrp->allcg_node, &root->allcg_list); list_add_tail_rcu(&cgrp->sibling, &cgrp->parent->children); root->number_of_cgroups++; |