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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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3b2728881d
[ Upstream commit03e02acda8] This is identical to eventfd_signal(), but it allows the caller to pass in a mask to be used for the poll wakeup key. The use case is avoiding repeated multishot triggers if we have a dependency between eventfd and io_uring. If we setup an eventfd context and register that as the io_uring eventfd, and at the same time queue a multishot poll request for the eventfd context, then any CQE posted will repeatedly trigger the multishot request until it terminates when the CQ ring overflows. In preparation for io_uring detecting this circular dependency, add the mentioned helper so that io_uring can pass in EPOLL_URING as part of the poll wakeup key. Cc: stable@vger.kernel.org # 6.0 [axboe: fold in !CONFIG_EVENTFD fix from Zhang Qilong] Signed-off-by: Jens Axboe <axboe@kernel.dk> Stable-dep-of:4464853277("io_uring: pass in EPOLL_URING_WAKE for eventfd signaling and wakeups") Signed-off-by: Sasha Levin <sashal@kernel.org>
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/eventfd.h
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*
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* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
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*
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*/
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#ifndef _LINUX_EVENTFD_H
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#define _LINUX_EVENTFD_H
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#include <linux/fcntl.h>
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#include <linux/wait.h>
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#include <linux/err.h>
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#include <linux/percpu-defs.h>
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#include <linux/percpu.h>
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#include <linux/sched.h>
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/*
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* CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
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* new flags, since they might collide with O_* ones. We want
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* to re-use O_* flags that couldn't possibly have a meaning
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* from eventfd, in order to leave a free define-space for
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* shared O_* flags.
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*/
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#define EFD_SEMAPHORE (1 << 0)
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#define EFD_CLOEXEC O_CLOEXEC
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#define EFD_NONBLOCK O_NONBLOCK
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#define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
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#define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
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struct eventfd_ctx;
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struct file;
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#ifdef CONFIG_EVENTFD
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void eventfd_ctx_put(struct eventfd_ctx *ctx);
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struct file *eventfd_fget(int fd);
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struct eventfd_ctx *eventfd_ctx_fdget(int fd);
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struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
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__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
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__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, unsigned mask);
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int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
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__u64 *cnt);
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void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt);
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static inline bool eventfd_signal_allowed(void)
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{
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return !current->in_eventfd;
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}
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#else /* CONFIG_EVENTFD */
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/*
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* Ugly ugly ugly error layer to support modules that uses eventfd but
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* pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
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*/
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static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline int eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
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{
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return -ENOSYS;
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}
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static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n,
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unsigned mask)
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{
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return -ENOSYS;
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}
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static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
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{
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}
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static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
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wait_queue_entry_t *wait, __u64 *cnt)
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{
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return -ENOSYS;
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}
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static inline bool eventfd_signal_allowed(void)
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{
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return true;
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}
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static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
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{
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}
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#endif
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#endif /* _LINUX_EVENTFD_H */
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