Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-virtiofs-20210315...
[qemu/ar7.git] / util / aio-posix.h
blobc80c04506a8590486de9646b839d2389db9bbe55
1 /*
2 * AioContext POSIX event loop implementation internal APIs
4 * Copyright IBM, Corp. 2008
5 * Copyright Red Hat, Inc. 2020
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
10 * This work is licensed under the terms of the GNU GPL, version 2. See
11 * the COPYING file in the top-level directory.
13 * Contributions after 2012-01-13 are licensed under the terms of the
14 * GNU GPL, version 2 or (at your option) any later version.
17 #ifndef AIO_POSIX_H
18 #define AIO_POSIX_H
20 #include "block/aio.h"
22 struct AioHandler {
23 GPollFD pfd;
24 IOHandler *io_read;
25 IOHandler *io_write;
26 AioPollFn *io_poll;
27 IOHandler *io_poll_begin;
28 IOHandler *io_poll_end;
29 void *opaque;
30 QLIST_ENTRY(AioHandler) node;
31 QLIST_ENTRY(AioHandler) node_ready; /* only used during aio_poll() */
32 QLIST_ENTRY(AioHandler) node_deleted;
33 QLIST_ENTRY(AioHandler) node_poll;
34 #ifdef CONFIG_LINUX_IO_URING
35 QSLIST_ENTRY(AioHandler) node_submitted;
36 unsigned flags; /* see fdmon-io_uring.c */
37 #endif
38 int64_t poll_idle_timeout; /* when to stop userspace polling */
39 bool is_external;
42 /* Add a handler to a ready list */
43 void aio_add_ready_handler(AioHandlerList *ready_list, AioHandler *node,
44 int revents);
46 extern const FDMonOps fdmon_poll_ops;
48 #ifdef CONFIG_EPOLL_CREATE1
49 bool fdmon_epoll_try_upgrade(AioContext *ctx, unsigned npfd);
50 void fdmon_epoll_setup(AioContext *ctx);
51 void fdmon_epoll_disable(AioContext *ctx);
52 #else
53 static inline bool fdmon_epoll_try_upgrade(AioContext *ctx, unsigned npfd)
55 return false;
58 static inline void fdmon_epoll_setup(AioContext *ctx)
62 static inline void fdmon_epoll_disable(AioContext *ctx)
65 #endif /* !CONFIG_EPOLL_CREATE1 */
67 #ifdef CONFIG_LINUX_IO_URING
68 bool fdmon_io_uring_setup(AioContext *ctx);
69 void fdmon_io_uring_destroy(AioContext *ctx);
70 #else
71 static inline bool fdmon_io_uring_setup(AioContext *ctx)
73 return false;
76 static inline void fdmon_io_uring_destroy(AioContext *ctx)
79 #endif /* !CONFIG_LINUX_IO_URING */
81 #endif /* AIO_POSIX_H */