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linux-sg2042
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Merge branch 'vhost-net' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

This commit is contained in:
David S. Miller 2010-09-09 21:59:51 -07:00
parent c9cedbba0f 615cc2211c
commit 053d8f6622
3 changed files with 76 additions and 30 deletions
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86
drivers/vhost/vhost.c
View File

@ -60,17 +60,8 @@ static int vhost_poll_wakeup(wait_queue_t *wait, unsigned mode, int sync,
return 0;
}
/* Init poll structure */
void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
unsigned long mask, struct vhost_dev *dev)
static void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn)
{
struct vhost_work *work = &poll->work;
init_waitqueue_func_entry(&poll->wait, vhost_poll_wakeup);
init_poll_funcptr(&poll->table, vhost_poll_func);
poll->mask = mask;
poll->dev = dev;
INIT_LIST_HEAD(&work->node);
work->fn = fn;
init_waitqueue_head(&work->done);
@ -78,6 +69,18 @@ void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
work->queue_seq = work->done_seq = 0;
}
/* Init poll structure */
void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn,
unsigned long mask, struct vhost_dev *dev)
{
init_waitqueue_func_entry(&poll->wait, vhost_poll_wakeup);
init_poll_funcptr(&poll->table, vhost_poll_func);
poll->mask = mask;
poll->dev = dev;
vhost_work_init(&poll->work, fn);
}
/* Start polling a file. We add ourselves to file's wait queue. The caller must
* keep a reference to a file until after vhost_poll_stop is called. */
void vhost_poll_start(struct vhost_poll *poll, struct file *file)
@ -95,35 +98,38 @@ void vhost_poll_stop(struct vhost_poll *poll)
remove_wait_queue(poll->wqh, &poll->wait);
}
/* Flush any work that has been scheduled. When calling this, don't hold any
* locks that are also used by the callback. */
void vhost_poll_flush(struct vhost_poll *poll)
static void vhost_work_flush(struct vhost_dev *dev, struct vhost_work *work)
{
struct vhost_work *work = &poll->work;
unsigned seq;
int left;
int flushing;
spin_lock_irq(&poll->dev->work_lock);
spin_lock_irq(&dev->work_lock);
seq = work->queue_seq;
work->flushing++;
spin_unlock_irq(&poll->dev->work_lock);
spin_unlock_irq(&dev->work_lock);
wait_event(work->done, ({
spin_lock_irq(&poll->dev->work_lock);
spin_lock_irq(&dev->work_lock);
left = seq - work->done_seq <= 0;
spin_unlock_irq(&poll->dev->work_lock);
spin_unlock_irq(&dev->work_lock);
left;
}));
spin_lock_irq(&poll->dev->work_lock);
spin_lock_irq(&dev->work_lock);
flushing = --work->flushing;
spin_unlock_irq(&poll->dev->work_lock);
spin_unlock_irq(&dev->work_lock);
BUG_ON(flushing < 0);
}
void vhost_poll_queue(struct vhost_poll *poll)
/* Flush any work that has been scheduled. When calling this, don't hold any
* locks that are also used by the callback. */
void vhost_poll_flush(struct vhost_poll *poll)
{
vhost_work_flush(poll->dev, &poll->work);
}
static inline void vhost_work_queue(struct vhost_dev *dev,
struct vhost_work *work)
{
struct vhost_dev *dev = poll->dev;
struct vhost_work *work = &poll->work;
unsigned long flags;
spin_lock_irqsave(&dev->work_lock, flags);
@ -135,6 +141,11 @@ void vhost_poll_queue(struct vhost_poll *poll)
spin_unlock_irqrestore(&dev->work_lock, flags);
}
void vhost_poll_queue(struct vhost_poll *poll)
{
vhost_work_queue(poll->dev, &poll->work);
}
static void vhost_vq_reset(struct vhost_dev *dev,
struct vhost_virtqueue *vq)
{
@ -236,6 +247,29 @@ long vhost_dev_check_owner(struct vhost_dev *dev)
return dev->mm == current->mm ? 0 : -EPERM;
}
struct vhost_attach_cgroups_struct {
struct vhost_work work;
struct task_struct *owner;
int ret;
};
static void vhost_attach_cgroups_work(struct vhost_work *work)
{
struct vhost_attach_cgroups_struct *s;
s = container_of(work, struct vhost_attach_cgroups_struct, work);
s->ret = cgroup_attach_task_all(s->owner, current);
}
static int vhost_attach_cgroups(struct vhost_dev *dev)
{
struct vhost_attach_cgroups_struct attach;
attach.owner = current;
vhost_work_init(&attach.work, vhost_attach_cgroups_work);
vhost_work_queue(dev, &attach.work);
vhost_work_flush(dev, &attach.work);
return attach.ret;
}
/* Caller should have device mutex */
static long vhost_dev_set_owner(struct vhost_dev *dev)
{
@ -255,14 +289,16 @@ static long vhost_dev_set_owner(struct vhost_dev *dev)
}
dev->worker = worker;
err = cgroup_attach_task_current_cg(worker);
wake_up_process(worker); /* avoid contributing to loadavg */
err = vhost_attach_cgroups(dev);
if (err)
goto err_cgroup;
wake_up_process(worker); /* avoid contributing to loadavg */
return 0;
err_cgroup:
kthread_stop(worker);
dev->worker = NULL;
err_worker:
if (dev->mm)
mmput(dev->mm);

11
include/linux/cgroup.h
View File

@ -578,7 +578,11 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task(struct cgroup *, struct task_struct *);
int cgroup_attach_task_current_cg(struct task_struct *);
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
static inline int cgroup_attach_task_current_cg(struct task_struct *tsk)
{
return cgroup_attach_task_all(current, tsk);
}
/*
* CSS ID is ID for cgroup_subsys_state structs under subsys. This only works
@ -636,6 +640,11 @@ static inline int cgroupstats_build(struct cgroupstats *stats,
}
/* No cgroups - nothing to do */
static inline int cgroup_attach_task_all(struct task_struct *from,
struct task_struct *t)
{
return 0;
}
static inline int cgroup_attach_task_current_cg(struct task_struct *t)
{
return 0;

9
kernel/cgroup.c
View File

@ -1791,10 +1791,11 @@ out:
}
/**
* cgroup_attach_task_current_cg - attach task 'tsk' to current task's cgroup
* cgroup_attach_task_all - attach task 'tsk' to all cgroups of task 'from'
* @from: attach to all cgroups of a given task
* @tsk: the task to be attached
*/
int cgroup_attach_task_current_cg(struct task_struct *tsk)
int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk)
{
struct cgroupfs_root *root;
struct cgroup *cur_cg;
@ -1802,7 +1803,7 @@ int cgroup_attach_task_current_cg(struct task_struct *tsk)
cgroup_lock();
for_each_active_root(root) {
cur_cg = task_cgroup_from_root(current, root);
cur_cg = task_cgroup_from_root(from, root);
retval = cgroup_attach_task(cur_cg, tsk);
if (retval)
break;
@ -1811,7 +1812,7 @@ int cgroup_attach_task_current_cg(struct task_struct *tsk)
return retval;
}
EXPORT_SYMBOL_GPL(cgroup_attach_task_current_cg);
EXPORT_SYMBOL_GPL(cgroup_attach_task_all);
/*
* Attach task with pid 'pid' to cgroup 'cgrp'. Call with cgroup_mutex