From c3c073f808b22dfae15ef8412b6f7b998644139a Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 21 Aug 2012 22:32:06 -0400 Subject: new helper: iterate_fd() iterates through the opened files in given descriptor table, calling a supplied function; we stop once non-zero is returned. Callback gets struct file *, descriptor number and const void * argument passed to iterator. It is called with files->file_lock held, so it is not allowed to block. tty_io, netprio_cgroup and selinux flush_unauthorized_files() converted to its use. Signed-off-by: Al Viro --- net/core/netprio_cgroup.c | 38 ++++++++++++-------------------------- 1 file changed, 12 insertions(+), 26 deletions(-) (limited to 'net/core') diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c index c75e3f9d060f..5ffd084c6a83 100644 --- a/net/core/netprio_cgroup.c +++ b/net/core/netprio_cgroup.c @@ -272,38 +272,24 @@ out_free_devname: return ret; } +static int update_netprio(const void *v, struct file *file, unsigned n) +{ + int err; + struct socket *sock = sock_from_file(file, &err); + if (sock) + sock->sk->sk_cgrp_prioidx = (u32)(unsigned long)v; + return 0; +} + void net_prio_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) { struct task_struct *p; + void *v; 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; - } - - spin_lock(&files->file_lock); - fdt = files_fdtable(files); - for (fd = 0; fd < fdt->max_fds; fd++) { - struct file *file; - struct socket *sock; - int err; - - file = fcheck_files(files, fd); - if (!file) - continue; - - sock = sock_from_file(file, &err); - if (sock) - sock_update_netprioidx(sock->sk, p); - } - spin_unlock(&files->file_lock); + v = (void *)(unsigned long)task_netprioidx(p); + iterate_fd(p->files, 0, update_netprio, v); task_unlock(p); } } -- cgit v1.2.3