LXR qemu/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/coroutine.h"
  21#include "qemu/iov.h"
  22
  23/* AIO request types */
  24#define QEMU_AIO_READ         0x0001
  25#define QEMU_AIO_WRITE        0x0002
  26#define QEMU_AIO_IOCTL        0x0004
  27#define QEMU_AIO_FLUSH        0x0008
  28#define QEMU_AIO_DISCARD      0x0010
  29#define QEMU_AIO_WRITE_ZEROES 0x0020
  30#define QEMU_AIO_COPY_RANGE   0x0040
  31#define QEMU_AIO_TRUNCATE     0x0080
  32#define QEMU_AIO_TYPE_MASK \
  33        (QEMU_AIO_READ | \
  34         QEMU_AIO_WRITE | \
  35         QEMU_AIO_IOCTL | \
  36         QEMU_AIO_FLUSH | \
  37         QEMU_AIO_DISCARD | \
  38         QEMU_AIO_WRITE_ZEROES | \
  39         QEMU_AIO_COPY_RANGE | \
  40         QEMU_AIO_TRUNCATE)
  41
  42/* AIO flags */
  43#define QEMU_AIO_MISALIGNED   0x1000
  44#define QEMU_AIO_BLKDEV       0x2000
  45#define QEMU_AIO_NO_FALLBACK  0x4000
  46
  47
  48/* linux-aio.c - Linux native implementation */
  49#ifdef CONFIG_LINUX_AIO
  50typedef struct LinuxAioState LinuxAioState;
  51LinuxAioState *laio_init(Error **errp);
  52void laio_cleanup(LinuxAioState *s);
  53int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  54                                uint64_t offset, QEMUIOVector *qiov, int type,
  55                                uint64_t dev_max_batch);
  56void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
  57void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
  58void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);
  59void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s,
  60                    uint64_t dev_max_batch);
  61#endif
  62/* io_uring.c - Linux io_uring implementation */
  63#ifdef CONFIG_LINUX_IO_URING
  64typedef struct LuringState LuringState;
  65LuringState *luring_init(Error **errp);
  66void luring_cleanup(LuringState *s);
  67int coroutine_fn luring_co_submit(BlockDriverState *bs, LuringState *s, int fd,
  68                                uint64_t offset, QEMUIOVector *qiov, int type);
  69void luring_detach_aio_context(LuringState *s, AioContext *old_context);
  70void luring_attach_aio_context(LuringState *s, AioContext *new_context);
  71void luring_io_plug(BlockDriverState *bs, LuringState *s);
  72void luring_io_unplug(BlockDriverState *bs, LuringState *s);
  73#endif
  74
  75#ifdef _WIN32
  76typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  77QEMUWin32AIOState *win32_aio_init(void);
  78void win32_aio_cleanup(QEMUWin32AIOState *aio);
  79int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  80BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
  81        QEMUWin32AIOState *aio, HANDLE hfile,
  82        uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
  83        BlockCompletionFunc *cb, void *opaque, int type);
  84void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  85                                  AioContext *old_context);
  86void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  87                                  AioContext *new_context);
  88#endif
  89
  90#endif /* QEMU_RAW_AIO_H */
  91