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
  38 typedef struct LinuxAioState LinuxAioState;
  39 LinuxAioState *laio_init(void);
  40 void laio_cleanup(LinuxAioState *s);
  41 BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
  42         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  43         BlockCompletionFunc *cb, void *opaque, int type);
  44 void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
  45 void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
  46 void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);
  47 void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s);
  48 #endif
  49
  50 #ifdef _WIN32
  51 typedef struct QEMUWin32AIOState QEMUWin32AIOState;
  52 QEMUWin32AIOState *win32_aio_init(void);
  53 void win32_aio_cleanup(QEMUWin32AIOState *aio);
  54 int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
  55 BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
  56         QEMUWin32AIOState *aio, HANDLE hfile,
  57         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  58         BlockCompletionFunc *cb, void *opaque, int type);
  59 void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
  60                                   AioContext *old_context);
  61 void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
  62                                   AioContext *new_context);
  63 #endif
  64
  65 #endif /* QEMU_RAW_AIO_H */