LXR qemu/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/iov.h"
  19
  20/* AIO request types */
  21#define QEMU_AIO_READ         0x0001
  22#define QEMU_AIO_WRITE        0x0002
  23#define QEMU_AIO_IOCTL        0x0004
  24#define QEMU_AIO_FLUSH        0x0008
  25#define QEMU_AIO_DISCARD      0x0010
  26#define QEMU_AIO_WRITE_ZEROES 0x0020
  27#define QEMU_AIO_TYPE_MASK \
  28        (QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH| \
  29         QEMU_AIO_DISCARD|QEMU_AIO_WRITE_ZEROES)
  30
  31/* AIO flags */
  32#define QEMU_AIO_MISALIGNED   0x1000
  33#define QEMU_AIO_BLKDEV       0x2000
  34
  35
  36/* linux-aio.c - Linux native implementation */
  37#ifdef CONFIG_LINUX_AIO
  38void *laio_init(void);
  39void laio_cleanup(void *s);
  40BlockAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
  41        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  42        BlockCompletionFunc *cb, void *opaque, int type);
  43void laio_detach_aio_context(void *s, AioContext *old_context);
  44void laio_attach_aio_context(void *s, AioContext *new_context);
  45void laio_io_plug(BlockDriverState *bs, void *aio_ctx);
  46void laio_io_unplug(BlockDriverState *bs, void *aio_ctx, bool unplug);
  47#endif
  48
  49#ifdef _WIN32
  50typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  51QEMUWin32AIOState *win32_aio_init(void);
  52void win32_aio_cleanup(QEMUWin32AIOState *aio);
  53int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  54BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
  55        QEMUWin32AIOState *aio, HANDLE hfile,
  56        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  57        BlockCompletionFunc *cb, void *opaque, int type);
  58void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  59                                  AioContext *old_context);
  60void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  61                                  AioContext *new_context);
  62#endif
  63
  64#endif /* QEMU_RAW_AIO_H */
  65