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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/eventpoll.h
2 * include/linux/eventpoll.h ( Efficient event polling implementation )
3 * Copyright (C) 2001,...,2006 Davide Libenzi
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * Davide Libenzi <davidel@xmailserver.org>
13 #ifndef _LINUX_EVENTPOLL_H
14 #define _LINUX_EVENTPOLL_H
16 #include <uapi/linux/eventpoll.h>
17 #include <uapi/linux/kcmp.h>
20 /* Forward declarations to avoid compiler errors */
26 #ifdef CONFIG_CHECKPOINT_RESTORE
27 struct file
*get_epoll_tfile_raw_ptr(struct file
*file
, int tfd
, unsigned long toff
);
30 /* Used to initialize the epoll bits inside the "struct file" */
31 static inline void eventpoll_init_file(struct file
*file
)
33 INIT_LIST_HEAD(&file
->f_ep_links
);
34 INIT_LIST_HEAD(&file
->f_tfile_llink
);
38 /* Used to release the epoll bits inside the "struct file" */
39 void eventpoll_release_file(struct file
*file
);
42 * This is called from inside fs/file_table.c:__fput() to unlink files
43 * from the eventpoll interface. We need to have this facility to cleanup
44 * correctly files that are closed without being removed from the eventpoll
47 static inline void eventpoll_release(struct file
*file
)
51 * Fast check to avoid the get/release of the semaphore. Since
52 * we're doing this outside the semaphore lock, it might return
53 * false negatives, but we don't care. It'll help in 99.99% of cases
54 * to avoid the semaphore lock. False positives simply cannot happen
55 * because the file in on the way to be removed and nobody ( but
56 * eventpoll ) has still a reference to this file.
58 if (likely(list_empty(&file
->f_ep_links
)))
62 * The file is being closed while it is still linked to an epoll
63 * descriptor. We need to handle this by correctly unlinking it
64 * from its containers.
66 eventpoll_release_file(file
);
71 static inline void eventpoll_init_file(struct file
*file
) {}
72 static inline void eventpoll_release(struct file
*file
) {}
76 #endif /* #ifndef _LINUX_EVENTPOLL_H */