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ep_send_events_proc(): fold into the caller

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... and get rid of struct ep_send_events_data - not needed anymore.
The weird way of passing the arguments in (and real return value
out - nominal return value of ep_send_events_proc() is ignored)
was due to the signature forced on ep_scan_ready_list() callbacks.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-08-31 13:39:52 -04:00
parent 443f1a0422
commit ff07952aed
1 changed files with 20 additions and 40 deletions
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60
fs/eventpoll.c
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@ -233,13 +233,6 @@ struct ep_pqueue {
struct epitem *epi;
};
/* Used by the ep_send_events() function as callback private data */
struct ep_send_events_data {
int maxevents;
struct epoll_event __user *events;
int res;
};
/*
* Configuration options available inside /proc/sys/fs/epoll/
*/
@ -1570,18 +1563,17 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi,
return 0;
}
static __poll_t ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv)
static int ep_send_events(struct eventpoll *ep,
struct epoll_event __user *events, int maxevents)
{
struct ep_send_events_data *esed = priv;
__poll_t revents;
struct epitem *epi, *tmp;
struct epoll_event __user *uevent = esed->events;
struct wakeup_source *ws;
LIST_HEAD(txlist);
poll_table pt;
int res = 0;
init_poll_funcptr(&pt, NULL);
esed->res = 0;
ep_start_scan(ep, 0, false, &txlist);
/*
* We can loop without lock because we are passed a task private list.
@ -1590,8 +1582,11 @@ static __poll_t ep_send_events_proc(struct eventpoll *ep, struct list_head *head
*/
lockdep_assert_held(&ep->mtx);
list_for_each_entry_safe(epi, tmp, head, rdllink) {
if (esed->res >= esed->maxevents)
list_for_each_entry_safe(epi, tmp, &txlist, rdllink) {
struct wakeup_source *ws;
__poll_t revents;
if (res >= maxevents)
break;
/*
@ -1622,16 +1617,16 @@ static __poll_t ep_send_events_proc(struct eventpoll *ep, struct list_head *head
if (!revents)
continue;
if (__put_user(revents, &uevent->events) ||
__put_user(epi->event.data, &uevent->data)) {
list_add(&epi->rdllink, head);
if (__put_user(revents, &events->events) ||
__put_user(epi->event.data, &events->data)) {
list_add(&epi->rdllink, &txlist);
ep_pm_stay_awake(epi);
if (!esed->res)
esed->res = -EFAULT;
return 0;
if (!res)
res = -EFAULT;
break;
}
esed->res++;
uevent++;
res++;
events++;
if (epi->event.events & EPOLLONESHOT)
epi->event.events &= EP_PRIVATE_BITS;
else if (!(epi->event.events & EPOLLET)) {
@ -1650,24 +1645,9 @@ static __poll_t ep_send_events_proc(struct eventpoll *ep, struct list_head *head
ep_pm_stay_awake(epi);
}
}
return 0;
}
static int ep_send_events(struct eventpoll *ep,
struct epoll_event __user *events, int maxevents)
{
struct ep_send_events_data esed;
LIST_HEAD(txlist);
esed.maxevents = maxevents;
esed.events = events;
ep_start_scan(ep, 0, false, &txlist);
ep_send_events_proc(ep, &txlist, &esed);
ep_done_scan(ep, 0, false, &txlist);
return esed.res;
return res;
}
static inline struct timespec64 ep_set_mstimeout(long ms)