string: factorize skip_spaces and export it to be generally available

[safe/jmp/linux-2.6] / block / blk-cgroup.c

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 4d4a277..1fa2654 100644 (file)
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -14,8 +14,11 @@
 #include <linux/seq_file.h>
 #include <linux/kdev_t.h>
 #include <linux/module.h>
+#include <linux/err.h>
 #include "blk-cgroup.h"
-#include "cfq-iosched.h"
+
+static DEFINE_SPINLOCK(blkio_list_lock);
+static LIST_HEAD(blkio_list);
 
 struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
 EXPORT_SYMBOL_GPL(blkio_root_cgroup);
@@ -138,6 +141,7 @@ blkiocg_weight_write(struct cgroup *cgroup, struct cftype *cftype, u64 val)
        struct blkio_cgroup *blkcg;
        struct blkio_group *blkg;
        struct hlist_node *n;
+       struct blkio_policy_type *blkiop;
 
        if (val < BLKIO_WEIGHT_MIN || val > BLKIO_WEIGHT_MAX)
                return -EINVAL;
@@ -145,8 +149,13 @@ blkiocg_weight_write(struct cgroup *cgroup, struct cftype *cftype, u64 val)
        blkcg = cgroup_to_blkio_cgroup(cgroup);
        spin_lock_irq(&blkcg->lock);
        blkcg->weight = (unsigned int)val;
-       hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
-               cfq_update_blkio_group_weight(blkg, blkcg->weight);
+       hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
+               spin_lock(&blkio_list_lock);
+               list_for_each_entry(blkiop, &blkio_list, list)
+                       blkiop->ops.blkio_update_group_weight_fn(blkg,
+                                       blkcg->weight);
+               spin_unlock(&blkio_list_lock);
+       }
        spin_unlock_irq(&blkcg->lock);
        return 0;
 }
@@ -224,6 +233,7 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
        unsigned long flags;
        struct blkio_group *blkg;
        void *key;
+       struct blkio_policy_type *blkiop;
 
        rcu_read_lock();
 remove_entry:
@@ -249,7 +259,10 @@ remove_entry:
         * we have more policies in place, we need some dynamic registration
         * of callback function.
         */
-       cfq_unlink_blkio_group(key, blkg);
+       spin_lock(&blkio_list_lock);
+       list_for_each_entry(blkiop, &blkio_list, list)
+               blkiop->ops.blkio_unlink_group_fn(key, blkg);
+       spin_unlock(&blkio_list_lock);
        goto remove_entry;
 done:
        free_css_id(&blkio_subsys, &blkcg->css);
@@ -330,3 +343,19 @@ struct cgroup_subsys blkio_subsys = {
        .subsys_id = blkio_subsys_id,
        .use_id = 1,
 };
+
+void blkio_policy_register(struct blkio_policy_type *blkiop)
+{
+       spin_lock(&blkio_list_lock);
+       list_add_tail(&blkiop->list, &blkio_list);
+       spin_unlock(&blkio_list_lock);
+}
+EXPORT_SYMBOL_GPL(blkio_policy_register);
+
+void blkio_policy_unregister(struct blkio_policy_type *blkiop)
+{
+       spin_lock(&blkio_list_lock);
+       list_del_init(&blkiop->list);
+       spin_unlock(&blkio_list_lock);
+}
+EXPORT_SYMBOL_GPL(blkio_policy_unregister);