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Commit 15252423 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

net: add support for ->poll_mask in proto_ops 



The socket file operations still implement ->poll until all protocols are
switched over.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 3cafb376

include/linux/net.h

+1 −0
Original line number Diff line number Diff line
@@ -147,6 +147,7 @@ struct proto_ops { 
	int		(*getname)   (struct socket *sock,

				      struct sockaddr *addr,

				      int peer);

	__poll_t	(*poll_mask) (struct socket *sock, __poll_t events);

	__poll_t	(*poll)	     (struct file *file, struct socket *sock,

				      struct poll_table_struct *wait);

	int		(*ioctl)     (struct socket *sock, unsigned int cmd,

net/socket.c

+43 −5
Original line number Diff line number Diff line
@@ -117,8 +117,10 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 
static int sock_mmap(struct file *file, struct vm_area_struct *vma);



static int sock_close(struct inode *inode, struct file *file);

static __poll_t sock_poll(struct file *file,

			      struct poll_table_struct *wait);

static struct wait_queue_head *sock_get_poll_head(struct file *file,

		__poll_t events);

static __poll_t sock_poll_mask(struct file *file, __poll_t);

static __poll_t sock_poll(struct file *file, struct poll_table_struct *wait);

static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

#ifdef CONFIG_COMPAT

static long compat_sock_ioctl(struct file *file,
@@ -141,6 +143,8 @@ static const struct file_operations socket_file_ops = { 
	.llseek =	no_llseek,

	.read_iter =	sock_read_iter,

	.write_iter =	sock_write_iter,

	.get_poll_head = sock_get_poll_head,

	.poll_mask =	sock_poll_mask,

	.poll =		sock_poll,

	.unlocked_ioctl = sock_ioctl,

#ifdef CONFIG_COMPAT
@@ -1114,14 +1118,48 @@ int sock_create_lite(int family, int type, int protocol, struct socket **res) 
}

EXPORT_SYMBOL(sock_create_lite);



static struct wait_queue_head *sock_get_poll_head(struct file *file,

		__poll_t events)

{

	struct socket *sock = file->private_data;



	if (!sock->ops->poll_mask)

		return NULL;

	sock_poll_busy_loop(sock, events);

	return sk_sleep(sock->sk);

}



static __poll_t sock_poll_mask(struct file *file, __poll_t events)

{

	struct socket *sock = file->private_data;



	/*

	 * We need to be sure we are in sync with the socket flags modification.

	 *

	 * This memory barrier is paired in the wq_has_sleeper.

	 */

	smp_mb();



	/* this socket can poll_ll so tell the system call */

	return sock->ops->poll_mask(sock, events) |

		(sk_can_busy_loop(sock->sk) ? POLL_BUSY_LOOP : 0);

}



/* No kernel lock held - perfect */

static __poll_t sock_poll(struct file *file, poll_table *wait)

{

	struct socket *sock = file->private_data;

	__poll_t events = poll_requested_events(wait);

	__poll_t events = poll_requested_events(wait), mask = 0;



	if (sock->ops->poll) {

		sock_poll_busy_loop(sock, events);

	return sock->ops->poll(file, sock, wait) | sock_poll_busy_flag(sock);

		mask = sock->ops->poll(file, sock, wait);

	} else if (sock->ops->poll_mask) {

		sock_poll_wait(file, sock_get_poll_head(file, events), wait);

		mask = sock->ops->poll_mask(sock, events);

	}



	return mask | sock_poll_busy_flag(sock);

}



static int sock_mmap(struct file *file, struct vm_area_struct *vma)