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authorDaniel Wagner <daniel.wagner@bmw-carit.de>2012-10-25 04:16:59 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-26 03:40:51 -0400
commit6a328d8c6f03501657ad580f6f98bf9a42583ff7 (patch)
parentfd9a08a7b83074e34c13c6340f673f7a51f53489 (diff)
cgroup: net_cls: Rework update socket logic
The cgroup logic part of net_cls is very similar as the one in net_prio. Let's stream line the net_cls logic with the net_prio one. The net_prio update logic was changed by following commit (note there were some changes necessary later on) commit 406a3c638ce8b17d9704052c07955490f732c2b8 Author: John Fastabend <john.r.fastabend@intel.com> Date: Fri Jul 20 10:39:25 2012 +0000 net: netprio_cgroup: rework update socket logic Instead of updating the sk_cgrp_prioidx struct field on every send this only updates the field when a task is moved via cgroup infrastructure. This allows sockets that may be used by a kernel worker thread to be managed. For example in the iscsi case today a user can put iscsid in a netprio cgroup and control traffic will be sent with the correct sk_cgrp_prioidx value set but as soon as data is sent the kernel worker thread isssues a send and sk_cgrp_prioidx is updated with the kernel worker threads value which is the default case. It seems more correct to only update the field when the user explicitly sets it via control group infrastructure. This allows the users to manage sockets that may be used with other threads. Since classid is now updated when the task is moved between the cgroups, we don't have to call sock_update_classid() from various places to ensure we always using the latest classid value. [v2: Use iterate_fd() instead of open coding] Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Cc: Li Zefan <lizefan@huawei.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Joe Perches <joe@perches.com> Cc: John Fastabend <john.r.fastabend@intel.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Stanislav Kinsbursky <skinsbursky@parallels.com> Cc: Tejun Heo <tj@kernel.org> Cc: <netdev@vger.kernel.org> Cc: <cgroups@vger.kernel.org> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
3 files changed, 24 insertions, 11 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e4858b20bf11..315751965f35 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -68,7 +68,6 @@
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/sock.h>
-#include <net/cls_cgroup.h>
#include <asm/uaccess.h>
@@ -587,8 +586,6 @@ static struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
struct sk_buff *skb;
int err;
- sock_update_classid(sk, current);
/* Under a page? Don't bother with paged skb. */
if (prepad + len < PAGE_SIZE || !linear)
linear = len;
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 2ecde225ae60..709b0fb38a18 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -17,6 +17,7 @@
#include <linux/skbuff.h>
#include <linux/cgroup.h>
#include <linux/rcupdate.h>
+#include <linux/fdtable.h>
#include <net/rtnetlink.h>
#include <net/pkt_cls.h>
#include <net/sock.h>
@@ -53,6 +54,28 @@ static void cgrp_destroy(struct cgroup *cgrp)
+static int update_classid(const void *v, struct file *file, unsigned n)
+ int err;
+ struct socket *sock = sock_from_file(file, &err);
+ if (sock)
+ sock->sk->sk_classid = (u32)(unsigned long)v;
+ return 0;
+static void cgrp_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
+ struct task_struct *p;
+ void *v;
+ cgroup_taskset_for_each(p, cgrp, tset) {
+ task_lock(p);
+ v = (void *)(unsigned long)task_cls_classid(p);
+ iterate_fd(p->files, 0, update_classid, v);
+ task_unlock(p);
+ }
static u64 read_classid(struct cgroup *cgrp, struct cftype *cft)
return cgrp_cls_state(cgrp)->classid;
@@ -77,6 +100,7 @@ struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.create = cgrp_create,
.destroy = cgrp_destroy,
+ .attach = cgrp_attach,
.subsys_id = net_cls_subsys_id,
.base_cftypes = ss_files,
.module = THIS_MODULE,
diff --git a/net/socket.c b/net/socket.c
index f1a481ab7532..2ca51c719ef9 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -620,8 +620,6 @@ static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
struct sock_iocb *si = kiocb_to_siocb(iocb);
- sock_update_classid(sock->sk, current);
si->sock = sock;
si->scm = NULL;
si->msg = msg;
@@ -784,8 +782,6 @@ static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock,
struct sock_iocb *si = kiocb_to_siocb(iocb);
- sock_update_classid(sock->sk, current);
si->sock = sock;
si->scm = NULL;
si->msg = msg;
@@ -896,8 +892,6 @@ static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
if (unlikely(!sock->ops->splice_read))
return -EINVAL;
- sock_update_classid(sock->sk, current);
return sock->ops->splice_read(sock, ppos, pipe, len, flags);
@@ -3437,8 +3431,6 @@ EXPORT_SYMBOL(kernel_setsockopt);
int kernel_sendpage(struct socket *sock, struct page *page, int offset,
size_t size, int flags)
- sock_update_classid(sock->sk, current);
if (sock->ops->sendpage)
return sock->ops->sendpage(sock, page, offset, size, flags);

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