Merge branch 'work.aio' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull aio fixes from Al Viro:
 "Assorted AIO followups and fixes"

* 'work.aio' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  eventpoll: switch to ->poll_mask
  aio: only return events requested in poll_mask() for IOCB_CMD_POLL
  eventfd: only return events requested in poll_mask()
  aio: mark __aio_sigset::sigmask const

Author: torvalds

fs/aio.c

@@ -1661,7 +1661,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 	if (mask && !(mask & req->events))
 		return 0;
 
-	mask = file->f_op->poll_mask(file, req->events);
+	mask = file->f_op->poll_mask(file, req->events) & req->events;
 	if (!mask)
 		return 0;
 
@@ -1719,7 +1719,7 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, struct iocb *iocb)
 
 	spin_lock_irq(&ctx->ctx_lock);
 	spin_lock(&req->head->lock);
-	mask = req->file->f_op->poll_mask(req->file, req->events);
+	mask = req->file->f_op->poll_mask(req->file, req->events) & req->events;
 	if (!mask) {
 		__add_wait_queue(req->head, &req->wait);
 		list_add_tail(&aiocb->ki_list, &ctx->active_reqs);

fs/eventfd.c

@@ -156,11 +156,11 @@ static __poll_t eventfd_poll_mask(struct file *file, __poll_t eventmask)
 	count = READ_ONCE(ctx->count);
 
 	if (count > 0)
-		events |= EPOLLIN;
+		events |= (EPOLLIN & eventmask);
 	if (count == ULLONG_MAX)
 		events |= EPOLLERR;
 	if (ULLONG_MAX - 1 > count)
-		events |= EPOLLOUT;
+		events |= (EPOLLOUT & eventmask);
 
 	return events;
 }

fs/eventpoll.c

@@ -922,13 +922,17 @@ static __poll_t ep_read_events_proc(struct eventpoll *ep, struct list_head *head
 	return 0;
 }
 
-static __poll_t ep_eventpoll_poll(struct file *file, poll_table *wait)
+static struct wait_queue_head *ep_eventpoll_get_poll_head(struct file *file,
+		__poll_t eventmask)
 {
 	struct eventpoll *ep = file->private_data;
-	int depth = 0;
+	return &ep->poll_wait;
+}
 
-	/* Insert inside our poll wait queue */
-	poll_wait(file, &ep->poll_wait, wait);
+static __poll_t ep_eventpoll_poll_mask(struct file *file, __poll_t eventmask)
+{
+	struct eventpoll *ep = file->private_data;
+	int depth = 0;
 
 	/*
 	 * Proceed to find out if wanted events are really available inside
@@ -968,7 +972,8 @@ static const struct file_operations eventpoll_fops = {
 	.show_fdinfo	= ep_show_fdinfo,
 #endif
 	.release	= ep_eventpoll_release,
-	.poll		= ep_eventpoll_poll,
+	.get_poll_head	= ep_eventpoll_get_poll_head,
+	.poll_mask	= ep_eventpoll_poll_mask,
 	.llseek		= noop_llseek,
 };
 

include/uapi/linux/aio_abi.h

@@ -109,7 +109,7 @@ struct iocb {
 #undef IFLITTLE
 
 struct __aio_sigset {
-	sigset_t __user	*sigmask;
+	const sigset_t __user	*sigmask;
 	size_t		sigsetsize;
 };