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_TYPE_MASK \
  29        (QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH| \
  30         QEMU_AIO_DISCARD|QEMU_AIO_WRITE_ZEROES)
  31
  32/* AIO flags */
  33#define QEMU_AIO_MISALIGNED   0x1000
  34#define QEMU_AIO_BLKDEV       0x2000
  35
  36
  37/* linux-aio.c - Linux native implementation */
  38#ifdef CONFIG_LINUX_AIO
  39typedef struct LinuxAioState LinuxAioState;
  40LinuxAioState *laio_init(void);
  41void laio_cleanup(LinuxAioState *s);
  42int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  43                                uint64_t offset, QEMUIOVector *qiov, int type);
  44BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  45        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  46        BlockCompletionFunc *cb, void *opaque, int type);
  47void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
  48void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
  49void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);
  50void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s);
  51#endif
  52
  53#ifdef _WIN32
  54typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  55QEMUWin32AIOState *win32_aio_init(void);
  56void win32_aio_cleanup(QEMUWin32AIOState *aio);
  57int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  58BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
  59        QEMUWin32AIOState *aio, HANDLE hfile,
  60        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  61        BlockCompletionFunc *cb, void *opaque, int type);
  62void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  63                                  AioContext *old_context);
  64void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  65                                  AioContext *new_context);
  66#endif
  67
  68#endif /* QEMU_RAW_AIO_H */
  69