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authorTejun Heo <tj@kernel.org>2012-11-22 19:32:47 +0400
committerTejun Heo <tj@kernel.org>2012-11-22 19:32:47 +0400
commit88d642fa2ce87c125b84cfcf23c371618d8b08b4 (patch)
tree3b55a847312a4286c77619090513096d973240eb /net
parent4a6ee25c7ea24decdf17af6fa2f2ab00acc7e4bf (diff)
downloadlinux-88d642fa2ce87c125b84cfcf23c371618d8b08b4.tar.xz
netprio_cgroup: use cgroup->id instead of cgroup_netprio_state->prioidx
With priomap expansion no longer depending on knowing max id allocated, netprio_cgroup can use cgroup->id insted of cs->prioidx. Drop prioidx alloc/free logic and convert all uses to cgroup->id. * In cgrp_css_alloc(), parent->id test is moved above @cs allocation to simplify error path. * In cgrp_css_free(), @cs assignment is made initialization. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Neil Horman <nhorman@tuxdriver.com> Tested-and-Acked-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/netprio_cgroup.c65
1 files changed, 11 insertions, 54 deletions
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 569d83da53d0..9409cdf9f268 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -28,10 +28,6 @@
#include <linux/fdtable.h>
#define PRIOMAP_MIN_SZ 128
-#define PRIOIDX_SZ 128
-
-static unsigned long prioidx_map[PRIOIDX_SZ];
-static DEFINE_SPINLOCK(prioidx_map_lock);
static inline struct cgroup_netprio_state *cgrp_netprio_state(struct cgroup *cgrp)
{
@@ -39,32 +35,6 @@ static inline struct cgroup_netprio_state *cgrp_netprio_state(struct cgroup *cgr
struct cgroup_netprio_state, css);
}
-static int get_prioidx(u32 *prio)
-{
- unsigned long flags;
- u32 prioidx;
-
- spin_lock_irqsave(&prioidx_map_lock, flags);
- prioidx = find_first_zero_bit(prioidx_map, sizeof(unsigned long) * PRIOIDX_SZ);
- if (prioidx == sizeof(unsigned long) * PRIOIDX_SZ) {
- spin_unlock_irqrestore(&prioidx_map_lock, flags);
- return -ENOSPC;
- }
- set_bit(prioidx, prioidx_map);
- spin_unlock_irqrestore(&prioidx_map_lock, flags);
- *prio = prioidx;
- return 0;
-}
-
-static void put_prioidx(u32 idx)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&prioidx_map_lock, flags);
- clear_bit(idx, prioidx_map);
- spin_unlock_irqrestore(&prioidx_map_lock, flags);
-}
-
/*
* Extend @dev->priomap so that it's large enough to accomodate
* @target_idx. @dev->priomap.priomap_len > @target_idx after successful
@@ -120,62 +90,50 @@ static int extend_netdev_table(struct net_device *dev, u32 target_idx)
static struct cgroup_subsys_state *cgrp_css_alloc(struct cgroup *cgrp)
{
struct cgroup_netprio_state *cs;
- int ret = -EINVAL;
+
+ if (cgrp->parent && cgrp->parent->id)
+ return ERR_PTR(-EINVAL);
cs = kzalloc(sizeof(*cs), GFP_KERNEL);
if (!cs)
return ERR_PTR(-ENOMEM);
- if (cgrp->parent && cgrp_netprio_state(cgrp->parent)->prioidx)
- goto out;
-
- ret = get_prioidx(&cs->prioidx);
- if (ret < 0) {
- pr_warn("No space in priority index array\n");
- goto out;
- }
-
return &cs->css;
-out:
- kfree(cs);
- return ERR_PTR(ret);
}
static void cgrp_css_free(struct cgroup *cgrp)
{
- struct cgroup_netprio_state *cs;
+ struct cgroup_netprio_state *cs = cgrp_netprio_state(cgrp);
struct net_device *dev;
struct netprio_map *map;
- cs = cgrp_netprio_state(cgrp);
rtnl_lock();
for_each_netdev(&init_net, dev) {
map = rtnl_dereference(dev->priomap);
- if (map && cs->prioidx < map->priomap_len)
- map->priomap[cs->prioidx] = 0;
+ if (map && cgrp->id < map->priomap_len)
+ map->priomap[cgrp->id] = 0;
}
rtnl_unlock();
- put_prioidx(cs->prioidx);
kfree(cs);
}
static u64 read_prioidx(struct cgroup *cgrp, struct cftype *cft)
{
- return (u64)cgrp_netprio_state(cgrp)->prioidx;
+ return cgrp->id;
}
static int read_priomap(struct cgroup *cont, struct cftype *cft,
struct cgroup_map_cb *cb)
{
struct net_device *dev;
- u32 prioidx = cgrp_netprio_state(cont)->prioidx;
+ u32 id = cont->id;
u32 priority;
struct netprio_map *map;
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
map = rcu_dereference(dev->priomap);
- priority = (map && prioidx < map->priomap_len) ? map->priomap[prioidx] : 0;
+ priority = (map && id < map->priomap_len) ? map->priomap[id] : 0;
cb->fill(cb, dev->name, priority);
}
rcu_read_unlock();
@@ -185,7 +143,6 @@ static int read_priomap(struct cgroup *cont, struct cftype *cft,
static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
const char *buffer)
{
- u32 prioidx = cgrp_netprio_state(cgrp)->prioidx;
char devname[IFNAMSIZ + 1];
struct net_device *dev;
struct netprio_map *map;
@@ -201,13 +158,13 @@ static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
rtnl_lock();
- ret = extend_netdev_table(dev, prioidx);
+ ret = extend_netdev_table(dev, cgrp->id);
if (ret)
goto out_unlock;
map = rtnl_dereference(dev->priomap);
if (map)
- map->priomap[prioidx] = prio;
+ map->priomap[cgrp->id] = prio;
out_unlock:
rtnl_unlock();
dev_put(dev);