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eventpoll: add epoll_sendevents() helper

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Basic helper that copies ready events to the specified userspace
address. The event checking is quick and racy, it's up to the caller
to ensure it retries appropriately in case 0 events are copied.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20250219172552.1565603-4-axboe@kernel.dk
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jens Axboe 2025-02-19 10:22:26 -07:00 committed by Christian Brauner
parent 38d2035601
commit ae3a4f1fdc
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2 changed files with 24 additions and 0 deletions
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20
fs/eventpoll.c
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@ -2474,6 +2474,26 @@ static int ep_check_params(struct file *file, struct epoll_event __user *evs,
return 0;
}
int epoll_sendevents(struct file *file, struct epoll_event __user *events,
int maxevents)
{
struct eventpoll *ep;
int ret;
ret = ep_check_params(file, events, maxevents);
if (unlikely(ret))
return ret;
ep = file->private_data;
/*
* Racy call, but that's ok - it should get retried based on
* poll readiness anyway.
*/
if (ep_events_available(ep))
return ep_try_send_events(ep, events, maxevents);
return 0;
}
/*
* Implement the event wait interface for the eventpoll file. It is the kernel
* part of the user space epoll_wait(2).

4
include/linux/eventpoll.h
View File

@ -25,6 +25,10 @@ struct file *get_epoll_tfile_raw_ptr(struct file *file, int tfd, unsigned long t
/* Used to release the epoll bits inside the "struct file" */
void eventpoll_release_file(struct file *file);
/* Copy ready events to userspace */
int epoll_sendevents(struct file *file, struct epoll_event __user *events,
int maxevents);
/*
* This is called from inside fs/file_table.c:__fput() to unlink files
* from the eventpoll interface. We need to have this facility to cleanup