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/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
  49typedef struct LinuxAioState LinuxAioState;
  50LinuxAioState *laio_init(Error **errp);
  51void laio_cleanup(LinuxAioState *s);
  52int 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);
  55void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
  56void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
  57void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);
  58void 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
  63typedef struct LuringState LuringState;
  64LuringState *luring_init(Error **errp);
  65void luring_cleanup(LuringState *s);
  66int coroutine_fn luring_co_submit(BlockDriverState *bs, LuringState *s, int fd,
  67                                uint64_t offset, QEMUIOVector *qiov, int type);
  68void luring_detach_aio_context(LuringState *s, AioContext *old_context);
  69void luring_attach_aio_context(LuringState *s, AioContext *new_context);
  70void luring_io_plug(BlockDriverState *bs, LuringState *s);
  71void luring_io_unplug(BlockDriverState *bs, LuringState *s);
  72#endif
  73
  74#ifdef _WIN32
  75typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  76QEMUWin32AIOState *win32_aio_init(void);
  77void win32_aio_cleanup(QEMUWin32AIOState *aio);
  78int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  79BlockAIOCB *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);
  83void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  84                                  AioContext *old_context);
  85void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  86                                  AioContext *new_context);
  87#endif
  88
  89#endif /* QEMU_RAW_AIO_H */
  90