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#ifndef QEMU_RAW_AIO_H
  16#define QEMU_RAW_AIO_H
  17
  18#include "qemu/coroutine.h"
  19#include "qemu/iov.h"
  20
  21/* AIO request types */
  22#define QEMU_AIO_READ         0x0001
  23#define QEMU_AIO_WRITE        0x0002
  24#define QEMU_AIO_IOCTL        0x0004
  25#define QEMU_AIO_FLUSH        0x0008
  26#define QEMU_AIO_DISCARD      0x0010
  27#define QEMU_AIO_WRITE_ZEROES 0x0020
  28#define QEMU_AIO_COPY_RANGE   0x0040
  29#define QEMU_AIO_TRUNCATE     0x0080
  30#define QEMU_AIO_TYPE_MASK \
  31        (QEMU_AIO_READ | \
  32         QEMU_AIO_WRITE | \
  33         QEMU_AIO_IOCTL | \
  34         QEMU_AIO_FLUSH | \
  35         QEMU_AIO_DISCARD | \
  36         QEMU_AIO_WRITE_ZEROES | \
  37         QEMU_AIO_COPY_RANGE | \
  38         QEMU_AIO_TRUNCATE)
  39
  40/* AIO flags */
  41#define QEMU_AIO_MISALIGNED   0x1000
  42#define QEMU_AIO_BLKDEV       0x2000
  43#define QEMU_AIO_NO_FALLBACK  0x4000
  44
  45
  46/* linux-aio.c - Linux native implementation */
  47#ifdef CONFIG_LINUX_AIO
  48typedef struct LinuxAioState LinuxAioState;
  49LinuxAioState *laio_init(Error **errp);
  50void laio_cleanup(LinuxAioState *s);
  51int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  52                                uint64_t offset, QEMUIOVector *qiov, int type);
  53BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  54        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  55        BlockCompletionFunc *cb, void *opaque, int type);
  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#endif
  61
  62#ifdef _WIN32
  63typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  64QEMUWin32AIOState *win32_aio_init(void);
  65void win32_aio_cleanup(QEMUWin32AIOState *aio);
  66int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  67BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
  68        QEMUWin32AIOState *aio, HANDLE hfile,
  69        uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
  70        BlockCompletionFunc *cb, void *opaque, int type);
  71void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  72                                  AioContext *old_context);
  73void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  74                                  AioContext *new_context);
  75#endif
  76
  77#endif /* QEMU_RAW_AIO_H */
  78