*/
static DEFINE_SPINLOCK(net_family_lock);
-static const struct net_proto_family *net_families[NPROTO] __read_mostly;
+static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
/*
* Statistics counters of the socket lists
}
+
static void wq_free_rcu(struct rcu_head *head)
{
struct socket_wq *wq = container_of(head, struct socket_wq, rcu);
.statfs = simple_statfs,
};
-static struct dentry *sockfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
-{
- return mount_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
-}
-
-static struct vfsmount *sock_mnt __read_mostly;
-
-static struct file_system_type sock_fs_type = {
- .name = "sockfs",
- .mount = sockfs_mount,
- .kill_sb = kill_anon_super,
-};
-
/*
* sockfs_dname() is called from d_path().
*/
.d_dname = sockfs_dname,
};
+static struct dentry *sockfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_pseudo(fs_type, "socket:", &sockfs_ops,
+ &sockfs_dentry_operations, SOCKFS_MAGIC);
+}
+
+static struct vfsmount *sock_mnt __read_mostly;
+
+static struct file_system_type sock_fs_type = {
+ .name = "sockfs",
+ .mount = sockfs_mount,
+ .kill_sb = kill_anon_super,
+};
+
/*
* Obtains the first available file descriptor and sets it up for use.
*
if (unlikely(fd < 0))
return fd;
- path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
+ path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
if (unlikely(!path.dentry)) {
put_unused_fd(fd);
return -ENOMEM;
}
path.mnt = mntget(sock_mnt);
- path.dentry->d_op = &sockfs_dentry_operations;
d_instantiate(path.dentry, SOCK_INODE(sock));
SOCK_INODE(sock)->i_fop = &socket_file_ops;
* requested real, full-featured networking support upon configuration.
* Otherwise module support will break!
*/
- if (net_families[family] == NULL)
+ if (rcu_access_pointer(net_families[family]) == NULL)
request_module("net-pf-%d", family);
#endif
}
spin_lock(&net_family_lock);
- if (net_families[ops->family])
+ if (rcu_dereference_protected(net_families[ops->family],
+ lockdep_is_held(&net_family_lock)))
err = -EEXIST;
else {
- net_families[ops->family] = ops;
+ rcu_assign_pointer(net_families[ops->family], ops);
err = 0;
}
spin_unlock(&net_family_lock);
BUG_ON(family < 0 || family >= NPROTO);
spin_lock(&net_family_lock);
- net_families[family] = NULL;
+ rcu_assign_pointer(net_families[family], NULL);
spin_unlock(&net_family_lock);
synchronize_rcu();
static int __init sock_init(void)
{
+ int err;
+
/*
* Initialize sock SLAB cache.
*/
*/
init_inodecache();
- register_filesystem(&sock_fs_type);
+
+ err = register_filesystem(&sock_fs_type);
+ if (err)
+ goto out_fs;
sock_mnt = kern_mount(&sock_fs_type);
+ if (IS_ERR(sock_mnt)) {
+ err = PTR_ERR(sock_mnt);
+ goto out_mount;
+ }
/* The real protocol initialization is performed in later initcalls.
*/
skb_timestamping_init();
#endif
- return 0;
+out:
+ return err;
+
+out_mount:
+ unregister_filesystem(&sock_fs_type);
+out_fs:
+ goto out;
}
core_initcall(sock_init); /* early initcall */