Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

[linux-2.6] / kernel / cgroup.c

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b893c8c94858bb203fe2fda7d2f44e9e8b4a5ca4..15ac0e1e4f4de9dde14a6fe17e9b3d6e059a4baf 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -119,6 +119,7 @@ static int root_count;
  * be called.
  */
 static int need_forkexit_callback;
+static int need_mm_owner_callback __read_mostly;
 
 /* convenient tests for these bits */
 inline int cgroup_is_removed(const struct cgroup *cgrp)
@@ -242,7 +243,6 @@ static void unlink_css_set(struct css_set *cg)
 {
        write_lock(&css_set_lock);
        hlist_del(&cg->hlist);
-       list_del(&cg->list);
        css_set_count--;
        while (!list_empty(&cg->cg_links)) {
                struct cg_cgroup_link *link;
@@ -477,8 +477,6 @@ static struct css_set *find_css_set(
 
        BUG_ON(!list_empty(&tmp_cg_links));
 
-       /* Link this cgroup group into the list */
-       list_add(&res->list, &init_css_set.list);
        css_set_count++;
 
        /* Add this cgroup group to the hash table */
@@ -577,7 +575,7 @@ static struct inode_operations cgroup_dir_inode_operations;
 static struct file_operations proc_cgroupstats_operations;
 
 static struct backing_dev_info cgroup_backing_dev_info = {
-       .capabilities   = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+       .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
 };
 
 static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
@@ -963,7 +961,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
        int ret = 0;
        struct super_block *sb;
        struct cgroupfs_root *root;
-       struct list_head tmp_cg_links, *l;
+       struct list_head tmp_cg_links;
        INIT_LIST_HEAD(&tmp_cg_links);
 
        /* First find the desired set of subsystems */
@@ -1005,6 +1003,7 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
                /* New superblock */
                struct cgroup *cgrp = &root->top_cgroup;
                struct inode *inode;
+               int i;
 
                BUG_ON(sb->s_root != NULL);
 
@@ -1049,22 +1048,25 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
                /* Link the top cgroup in this hierarchy into all
                 * the css_set objects */
                write_lock(&css_set_lock);
-               l = &init_css_set.list;
-               do {
+               for (i = 0; i < CSS_SET_TABLE_SIZE; i++) {
+                       struct hlist_head *hhead = &css_set_table[i];
+                       struct hlist_node *node;
                        struct css_set *cg;
-                       struct cg_cgroup_link *link;
-                       cg = list_entry(l, struct css_set, list);
-                       BUG_ON(list_empty(&tmp_cg_links));
-                       link = list_entry(tmp_cg_links.next,
-                                         struct cg_cgroup_link,
-                                         cgrp_link_list);
-                       list_del(&link->cgrp_link_list);
-                       link->cg = cg;
-                       list_add(&link->cgrp_link_list,
-                                &root->top_cgroup.css_sets);
-                       list_add(&link->cg_link_list, &cg->cg_links);
-                       l = l->next;
-               } while (l != &init_css_set.list);
+
+                       hlist_for_each_entry(cg, node, hhead, hlist) {
+                               struct cg_cgroup_link *link;
+
+                               BUG_ON(list_empty(&tmp_cg_links));
+                               link = list_entry(tmp_cg_links.next,
+                                                 struct cg_cgroup_link,
+                                                 cgrp_link_list);
+                               list_del(&link->cgrp_link_list);
+                               link->cg = cg;
+                               list_add(&link->cgrp_link_list,
+                                        &root->top_cgroup.css_sets);
+                               list_add(&link->cg_link_list, &cg->cg_links);
+                       }
+               }
                write_unlock(&css_set_lock);
 
                free_cg_links(&tmp_cg_links);
@@ -1548,11 +1550,14 @@ static int cgroup_seqfile_show(struct seq_file *m, void *arg)
 {
        struct cgroup_seqfile_state *state = m->private;
        struct cftype *cft = state->cft;
-       struct cgroup_map_cb cb = {
-               .fill = cgroup_map_add,
-               .state = m,
-       };
-       return cft->read_map(state->cgroup, cft, &cb);
+       if (cft->read_map) {
+               struct cgroup_map_cb cb = {
+                       .fill = cgroup_map_add,
+                       .state = m,
+               };
+               return cft->read_map(state->cgroup, cft, &cb);
+       }
+       return cft->read_seq_string(state->cgroup, cft, m);
 }
 
 int cgroup_seqfile_release(struct inode *inode, struct file *file)
@@ -1580,7 +1585,7 @@ static int cgroup_file_open(struct inode *inode, struct file *file)
        cft = __d_cft(file->f_dentry);
        if (!cft)
                return -ENODEV;
-       if (cft->read_map) {
+       if (cft->read_map || cft->read_seq_string) {
                struct cgroup_seqfile_state *state =
                        kzalloc(sizeof(*state), GFP_USER);
                if (!state)
@@ -2494,6 +2499,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
        init_css_set.subsys[ss->subsys_id] = dummytop->subsys[ss->subsys_id];
 
        need_forkexit_callback |= ss->fork || ss->exit;
+       need_mm_owner_callback |= !!ss->mm_owner_changed;
 
        /* At system boot, before all subsystems have been
         * registered, no tasks have been forked, so we don't
@@ -2514,7 +2520,6 @@ int __init cgroup_init_early(void)
        int i;
        kref_init(&init_css_set.ref);
        kref_get(&init_css_set.ref);
-       INIT_LIST_HEAD(&init_css_set.list);
        INIT_LIST_HEAD(&init_css_set.cg_links);
        INIT_LIST_HEAD(&init_css_set.tasks);
        INIT_HLIST_NODE(&init_css_set.hlist);
@@ -2745,6 +2750,34 @@ void cgroup_fork_callbacks(struct task_struct *child)
        }
 }
 
+#ifdef CONFIG_MM_OWNER
+/**
+ * cgroup_mm_owner_callbacks - run callbacks when the mm->owner changes
+ * @p: the new owner
+ *
+ * Called on every change to mm->owner. mm_init_owner() does not
+ * invoke this routine, since it assigns the mm->owner the first time
+ * and does not change it.
+ */
+void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
+{
+       struct cgroup *oldcgrp, *newcgrp;
+
+       if (need_mm_owner_callback) {
+               int i;
+               for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
+                       struct cgroup_subsys *ss = subsys[i];
+                       oldcgrp = task_cgroup(old, ss->subsys_id);
+                       newcgrp = task_cgroup(new, ss->subsys_id);
+                       if (oldcgrp == newcgrp)
+                               continue;
+                       if (ss->mm_owner_changed)
+                               ss->mm_owner_changed(ss, oldcgrp, newcgrp);
+               }
+       }
+}
+#endif /* CONFIG_MM_OWNER */
+
 /**
  * cgroup_post_fork - called on a new task after adding it to the task list
  * @child: the task in question
@@ -2870,7 +2903,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys)
        cg = tsk->cgroups;
        parent = task_cgroup(tsk, subsys->subsys_id);
 
-       snprintf(nodename, MAX_CGROUP_TYPE_NAMELEN, "node_%d", tsk->pid);
+       snprintf(nodename, MAX_CGROUP_TYPE_NAMELEN, "%d", tsk->pid);
 
        /* Pin the hierarchy */
        atomic_inc(&parent->root->sb->s_active);