util/aio-posix.h

   1 /*
   2  * AioContext POSIX event loop implementation internal APIs
   3  *
   4  * Copyright IBM, Corp. 2008
   5  * Copyright Red Hat, Inc. 2020
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  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.
  15  */
  16
  17 #ifndef AIO_POSIX_H
  18 #define AIO_POSIX_H
  19
  20 #include "block/aio.h"
  21
  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 #ifdef CONFIG_LINUX_IO_URING
  34     QSLIST_ENTRY(AioHandler) node_submitted;
  35     unsigned flags; /* see fdmon-io_uring.c */
  36 #endif
  37     bool is_external;
  38 };
  39
  40 /* Add a handler to a ready list */
  41 void aio_add_ready_handler(AioHandlerList *ready_list, AioHandler *node,
  42                            int revents);
  43
  44 extern const FDMonOps fdmon_poll_ops;
  45
  46 #ifdef CONFIG_EPOLL_CREATE1
  47 bool fdmon_epoll_try_upgrade(AioContext *ctx, unsigned npfd);
  48 void fdmon_epoll_setup(AioContext *ctx);
  49 void fdmon_epoll_disable(AioContext *ctx);
  50 #else
  51 static inline bool fdmon_epoll_try_upgrade(AioContext *ctx, unsigned npfd)
  52 {
  53     return false;
  54 }
  55
  56 static inline void fdmon_epoll_setup(AioContext *ctx)
  57 {
  58 }
  59
  60 static inline void fdmon_epoll_disable(AioContext *ctx)
  61 {
  62 }
  63 #endif /* !CONFIG_EPOLL_CREATE1 */
  64
  65 #ifdef CONFIG_LINUX_IO_URING
  66 bool fdmon_io_uring_setup(AioContext *ctx);
  67 void fdmon_io_uring_destroy(AioContext *ctx);
  68 #else
  69 static inline bool fdmon_io_uring_setup(AioContext *ctx)
  70 {
  71     return false;
  72 }
  73
  74 static inline void fdmon_io_uring_destroy(AioContext *ctx)
  75 {
  76 }
  77 #endif /* !CONFIG_LINUX_IO_URING */
  78
  79 #endif /* AIO_POSIX_H */