include/block/raw-aio.h

   1 /*
   2  * Declarations for AIO in the raw protocol
   3  *
   4  * Copyright IBM, Corp. 2008
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #ifndef QEMU_RAW_AIO_H
  17 #define QEMU_RAW_AIO_H
  18
  19 #include "block/aio.h"
  20 #include "qemu/iov.h"
  21
  22 /* AIO request types */
  23 #define QEMU_AIO_READ         0x0001
  24 #define QEMU_AIO_WRITE        0x0002
  25 #define QEMU_AIO_IOCTL        0x0004
  26 #define QEMU_AIO_FLUSH        0x0008
  27 #define QEMU_AIO_DISCARD      0x0010
  28 #define QEMU_AIO_WRITE_ZEROES 0x0020
  29 #define QEMU_AIO_COPY_RANGE   0x0040
  30 #define QEMU_AIO_TRUNCATE     0x0080
  31 #define QEMU_AIO_TYPE_MASK \
  32         (QEMU_AIO_READ | \
  33          QEMU_AIO_WRITE | \
  34          QEMU_AIO_IOCTL | \
  35          QEMU_AIO_FLUSH | \
  36          QEMU_AIO_DISCARD | \
  37          QEMU_AIO_WRITE_ZEROES | \
  38          QEMU_AIO_COPY_RANGE | \
  39          QEMU_AIO_TRUNCATE)
  40
  41 /* AIO flags */
  42 #define QEMU_AIO_MISALIGNED   0x1000
  43 #define QEMU_AIO_BLKDEV       0x2000
  44 #define QEMU_AIO_NO_FALLBACK  0x4000
  45
  46
  47 /* linux-aio.c - Linux native implementation */
  48 #ifdef CONFIG_LINUX_AIO
  49 typedef struct LinuxAioState LinuxAioState;
  50 LinuxAioState *laio_init(Error **errp);
  51 void laio_cleanup(LinuxAioState *s);
  52 int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  53                                 uint64_t offset, QEMUIOVector *qiov, int type,
  54                                 uint64_t dev_max_batch);
  55 void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
  56 void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
  57 void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);
  58 void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s,
  59                     uint64_t dev_max_batch);
  60 #endif
  61 /* io_uring.c - Linux io_uring implementation */
  62 #ifdef CONFIG_LINUX_IO_URING
  63 typedef struct LuringState LuringState;
  64 LuringState *luring_init(Error **errp);
  65 void luring_cleanup(LuringState *s);
  66 int coroutine_fn luring_co_submit(BlockDriverState *bs, LuringState *s, int fd,
  67                                 uint64_t offset, QEMUIOVector *qiov, int type);
  68 void luring_detach_aio_context(LuringState *s, AioContext *old_context);
  69 void luring_attach_aio_context(LuringState *s, AioContext *new_context);
  70 void luring_io_plug(BlockDriverState *bs, LuringState *s);
  71 void luring_io_unplug(BlockDriverState *bs, LuringState *s);
  72 #endif
  73
  74 #ifdef _WIN32
  75 typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  76 QEMUWin32AIOState *win32_aio_init(void);
  77 void win32_aio_cleanup(QEMUWin32AIOState *aio);
  78 int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  79 BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
  80         QEMUWin32AIOState *aio, HANDLE hfile,
  81         uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
  82         BlockCompletionFunc *cb, void *opaque, int type);
  83 void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  84                                   AioContext *old_context);
  85 void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  86                                   AioContext *new_context);
  87 #endif
  88
  89 #endif /* QEMU_RAW_AIO_H */