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cgroup: build list of all cgroups under a given cgroupfs_root
Build a list of all cgroups anchored at cgroupfs_root->allcg_list and going through cgroup->allcg_node. The list is protected by cgroup_mutex and will be used to improve cgroup file handling. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizf@cn.fujitsu.com>
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2 changed files with 12 additions and 0 deletions
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@ -191,6 +191,8 @@ struct cgroup {
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*/
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*/
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struct list_head css_sets;
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struct list_head css_sets;
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struct list_head allcg_node; /* cgroupfs_root->allcg_list */
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/*
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/*
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* Linked list running through all cgroups that can
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* Linked list running through all cgroups that can
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* potentially be reaped by the release agent. Protected by
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* potentially be reaped by the release agent. Protected by
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@ -127,6 +127,9 @@ struct cgroupfs_root {
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/* A list running through the active hierarchies */
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/* A list running through the active hierarchies */
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struct list_head root_list;
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struct list_head root_list;
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/* All cgroups on this root, cgroup_mutex protected */
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struct list_head allcg_list;
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/* Hierarchy-specific flags */
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/* Hierarchy-specific flags */
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unsigned long flags;
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unsigned long flags;
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@ -1350,11 +1353,14 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
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static void init_cgroup_root(struct cgroupfs_root *root)
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static void init_cgroup_root(struct cgroupfs_root *root)
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{
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{
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struct cgroup *cgrp = &root->top_cgroup;
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struct cgroup *cgrp = &root->top_cgroup;
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INIT_LIST_HEAD(&root->subsys_list);
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INIT_LIST_HEAD(&root->subsys_list);
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INIT_LIST_HEAD(&root->root_list);
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INIT_LIST_HEAD(&root->root_list);
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INIT_LIST_HEAD(&root->allcg_list);
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root->number_of_cgroups = 1;
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root->number_of_cgroups = 1;
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cgrp->root = root;
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cgrp->root = root;
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cgrp->top_cgroup = cgrp;
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cgrp->top_cgroup = cgrp;
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list_add_tail(&cgrp->allcg_node, &root->allcg_list);
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init_cgroup_housekeeping(cgrp);
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init_cgroup_housekeeping(cgrp);
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}
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}
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@ -3790,6 +3796,8 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
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/* The cgroup directory was pre-locked for us */
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/* The cgroup directory was pre-locked for us */
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BUG_ON(!mutex_is_locked(&cgrp->dentry->d_inode->i_mutex));
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BUG_ON(!mutex_is_locked(&cgrp->dentry->d_inode->i_mutex));
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list_add_tail(&cgrp->allcg_node, &root->allcg_list);
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err = cgroup_populate_dir(cgrp);
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err = cgroup_populate_dir(cgrp);
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/* If err < 0, we have a half-filled directory - oh well ;) */
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/* If err < 0, we have a half-filled directory - oh well ;) */
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@ -3998,6 +4006,8 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
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list_del_init(&cgrp->sibling);
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list_del_init(&cgrp->sibling);
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cgroup_unlock_hierarchy(cgrp->root);
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cgroup_unlock_hierarchy(cgrp->root);
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list_del_init(&cgrp->allcg_node);
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d = dget(cgrp->dentry);
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d = dget(cgrp->dentry);
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cgroup_d_remove_dir(d);
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cgroup_d_remove_dir(d);
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