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Date: Thu, 14 Mar 2013 04:05:12 +0000
From: Eric Wong <normalperson@...t.net>
To: Davide Libenzi <davidel@...ilserver.org>
Cc: Al Viro <viro@...IV.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] epoll: cleanup: hoist out f_op->poll calls
This reduces the amount of code inside the ready list iteration loops
for better readability IMHO.
Signed-off-by: Eric Wong <normalperson@...t.net>
Cc: Davide Libenzi <davidel@...ilserver.org>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
(I think this depends on my RCU wakeup source patch sitting in -mm)
fs/eventpoll.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index d71b754..a4e4ad7 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -772,6 +772,13 @@ static int ep_eventpoll_release(struct inode *inode, struct file *file)
return 0;
}
+static inline unsigned int ep_item_poll(struct epitem *epi, poll_table *pt)
+{
+ pt->_key = epi->event.events;
+
+ return epi->ffd.file->f_op->poll(epi->ffd.file, pt) & epi->event.events;
+}
+
static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv)
{
@@ -779,10 +786,9 @@ static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
poll_table pt;
init_poll_funcptr(&pt, NULL);
+
list_for_each_entry_safe(epi, tmp, head, rdllink) {
- pt._key = epi->event.events;
- if (epi->ffd.file->f_op->poll(epi->ffd.file, &pt) &
- epi->event.events)
+ if (ep_item_poll(epi, &pt))
return POLLIN | POLLRDNORM;
else {
/*
@@ -1256,7 +1262,6 @@ static int ep_insert(struct eventpoll *ep, struct epoll_event *event,
/* Initialize the poll table using the queue callback */
epq.epi = epi;
init_poll_funcptr(&epq.pt, ep_ptable_queue_proc);
- epq.pt._key = event->events;
/*
* Attach the item to the poll hooks and get current event bits.
@@ -1265,7 +1270,7 @@ static int ep_insert(struct eventpoll *ep, struct epoll_event *event,
* this operation completes, the poll callback can start hitting
* the new item.
*/
- revents = tfile->f_op->poll(tfile, &epq.pt);
+ revents = ep_item_poll(epi, &epq.pt);
/*
* We have to check if something went wrong during the poll wait queue
@@ -1365,7 +1370,6 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi, struct epoll_even
* f_op->poll() call and the new event set registering.
*/
epi->event.events = event->events; /* need barrier below */
- pt._key = event->events;
epi->event.data = event->data; /* protected by mtx */
if (epi->event.events & EPOLLWAKEUP) {
if (!ep_has_wakeup_source(epi))
@@ -1398,7 +1402,7 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi, struct epoll_even
* Get current event bits. We can safely use the file* here because
* its usage count has been increased by the caller of this function.
*/
- revents = epi->ffd.file->f_op->poll(epi->ffd.file, &pt);
+ revents = ep_item_poll(epi, &pt);
/*
* If the item is "hot" and it is not registered inside the ready
@@ -1466,9 +1470,7 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
list_del_init(&epi->rdllink);
- pt._key = epi->event.events;
- revents = epi->ffd.file->f_op->poll(epi->ffd.file, &pt) &
- epi->event.events;
+ revents = ep_item_poll(epi, &pt);
/*
* If the event mask intersect the caller-requested one,
--
Eric Wong
--
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