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     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;
  40 };
  41
  42 /* Add a handler to a ready list */
  43 void aio_add_ready_handler(AioHandlerList *ready_list, AioHandler *node,
  44                            int revents);
  45
  46 extern const FDMonOps fdmon_poll_ops;
  47
  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)
  54 {
  55     return false;
  56 }
  57
  58 static inline void fdmon_epoll_setup(AioContext *ctx)
  59 {
  60 }
  61
  62 static inline void fdmon_epoll_disable(AioContext *ctx)
  63 {
  64 }
  65 #endif /* !CONFIG_EPOLL_CREATE1 */
  66
  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)
  72 {
  73     return false;
  74 }
  75
  76 static inline void fdmon_io_uring_destroy(AioContext *ctx)
  77 {
  78 }
  79 #endif /* !CONFIG_LINUX_IO_URING */
  80
  81 #endif /* AIO_POSIX_H */