diff options
author | Tejun Heo <tj@kernel.org> | 2012-11-22 07:32:47 -0800 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2012-11-22 07:32:47 -0800 |
commit | 88d642fa2ce87c125b84cfcf23c371618d8b08b4 (patch) | |
tree | 3b55a847312a4286c77619090513096d973240eb /net/core/netprio_cgroup.c | |
parent | 4a6ee25c7ea24decdf17af6fa2f2ab00acc7e4bf (diff) |
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/core/netprio_cgroup.c')
-rw-r--r-- | net/core/netprio_cgroup.c | 65 |
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); |