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authorJohn Fastabend <john.r.fastabend@intel.com>2012-07-20 10:39:25 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-22 12:44:01 -0700
commit406a3c638ce8b17d9704052c07955490f732c2b8 (patch)
treedb759dfccc6c09196773d0cc1ec260a7a4e9db07
parent0690899b4d4501b3505be069b9a687e68ccbe15b (diff)
downloadlinux-406a3c638ce8b17d9704052c07955490f732c2b8.tar.gz
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. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/net.h1
-rw-r--r--include/net/netprio_cgroup.h4
-rw-r--r--net/core/netprio_cgroup.c53
-rw-r--r--net/core/sock.c6
-rw-r--r--net/socket.c5
5 files changed, 61 insertions, 8 deletions
diff --git a/include/linux/net.h b/include/linux/net.h
index dc95700de5d..99276c3dc89 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -248,6 +248,7 @@ extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
size_t size, int flags);
extern int sock_map_fd(struct socket *sock, int flags);
extern struct socket *sockfd_lookup(int fd, int *err);
+extern struct socket *sock_from_file(struct file *file, int *err);
#define sockfd_put(sock) fput(sock->file)
extern int net_ratelimit(void);
diff --git a/include/net/netprio_cgroup.h b/include/net/netprio_cgroup.h
index d58fdec4759..2719dec6b5a 100644
--- a/include/net/netprio_cgroup.h
+++ b/include/net/netprio_cgroup.h
@@ -35,7 +35,7 @@ struct cgroup_netprio_state {
extern int net_prio_subsys_id;
#endif
-extern void sock_update_netprioidx(struct sock *sk);
+extern void sock_update_netprioidx(struct sock *sk, struct task_struct *task);
#if IS_BUILTIN(CONFIG_NETPRIO_CGROUP)
@@ -82,7 +82,7 @@ static inline u32 task_netprioidx(struct task_struct *p)
#endif /* CONFIG_NETPRIO_CGROUP */
#else
-#define sock_update_netprioidx(sk)
+#define sock_update_netprioidx(sk, task)
#endif
#endif /* _NET_CLS_CGROUP_H */
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index b2e9caa1ad1..63d15e8f80e 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -25,6 +25,8 @@
#include <net/sock.h>
#include <net/netprio_cgroup.h>
+#include <linux/fdtable.h>
+
#define PRIOIDX_SZ 128
static unsigned long prioidx_map[PRIOIDX_SZ];
@@ -272,6 +274,56 @@ out_free_devname:
return ret;
}
+void net_prio_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
+{
+ struct task_struct *p;
+ char *tmp = kzalloc(sizeof(char) * PATH_MAX, GFP_KERNEL);
+
+ if (!tmp) {
+ pr_warn("Unable to attach cgrp due to alloc failure!\n");
+ return;
+ }
+
+ cgroup_taskset_for_each(p, cgrp, tset) {
+ unsigned int fd;
+ struct fdtable *fdt;
+ struct files_struct *files;
+
+ task_lock(p);
+ files = p->files;
+ if (!files) {
+ task_unlock(p);
+ continue;
+ }
+
+ rcu_read_lock();
+ fdt = files_fdtable(files);
+ for (fd = 0; fd < fdt->max_fds; fd++) {
+ char *path;
+ struct file *file;
+ struct socket *sock;
+ unsigned long s;
+ int rv, err = 0;
+
+ file = fcheck_files(files, fd);
+ if (!file)
+ continue;
+
+ path = d_path(&file->f_path, tmp, PAGE_SIZE);
+ rv = sscanf(path, "socket:[%lu]", &s);
+ if (rv <= 0)
+ continue;
+
+ sock = sock_from_file(file, &err);
+ if (!err)
+ sock_update_netprioidx(sock->sk, p);
+ }
+ rcu_read_unlock();
+ task_unlock(p);
+ }
+ kfree(tmp);
+}
+
static struct cftype ss_files[] = {
{
.name = "prioidx",
@@ -289,6 +341,7 @@ struct cgroup_subsys net_prio_subsys = {
.name = "net_prio",
.create = cgrp_create,
.destroy = cgrp_destroy,
+ .attach = net_prio_attach,
#ifdef CONFIG_NETPRIO_CGROUP
.subsys_id = net_prio_subsys_id,
#endif
diff --git a/net/core/sock.c b/net/core/sock.c
index 24039ac1242..2676a88f533 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1180,12 +1180,12 @@ void sock_update_classid(struct sock *sk)
}
EXPORT_SYMBOL(sock_update_classid);
-void sock_update_netprioidx(struct sock *sk)
+void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
{
if (in_interrupt())
return;
- sk->sk_cgrp_prioidx = task_netprioidx(current);
+ sk->sk_cgrp_prioidx = task_netprioidx(task);
}
EXPORT_SYMBOL_GPL(sock_update_netprioidx);
#endif
@@ -1215,7 +1215,7 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
atomic_set(&sk->sk_wmem_alloc, 1);
sock_update_classid(sk);
- sock_update_netprioidx(sk);
+ sock_update_netprioidx(sk, current);
}
return sk;
diff --git a/net/socket.c b/net/socket.c
index 0452dca4cd2..dfe5b66c97e 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -398,7 +398,7 @@ int sock_map_fd(struct socket *sock, int flags)
}
EXPORT_SYMBOL(sock_map_fd);
-static struct socket *sock_from_file(struct file *file, int *err)
+struct socket *sock_from_file(struct file *file, int *err)
{
if (file->f_op == &socket_file_ops)
return file->private_data; /* set in sock_map_fd */
@@ -406,6 +406,7 @@ static struct socket *sock_from_file(struct file *file, int *err)
*err = -ENOTSOCK;
return NULL;
}
+EXPORT_SYMBOL(sock_from_file);
/**
* sockfd_lookup - Go from a file number to its socket slot
@@ -554,8 +555,6 @@ static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock,
sock_update_classid(sock->sk);
- sock_update_netprioidx(sock->sk);
-
si->sock = sock;
si->scm = NULL;
si->msg = msg;