block/raw-posix-aio.h

   1 /*
   2  * QEMU Posix block I/O backend AIO support
   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  */
  13 #ifndef QEMU_RAW_POSIX_AIO_H
  14 #define QEMU_RAW_POSIX_AIO_H
  15
  16 /* AIO request types */
  17 #define QEMU_AIO_READ         0x0001
  18 #define QEMU_AIO_WRITE        0x0002
  19 #define QEMU_AIO_IOCTL        0x0004
  20 #define QEMU_AIO_FLUSH        0x0008
  21 #define QEMU_AIO_TYPE_MASK \
  22         (QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH)
  23
  24 /* AIO flags */
  25 #define QEMU_AIO_MISALIGNED   0x1000
  26
  27
  28 /* posix-aio-compat.c - thread pool based implementation */
  29 int paio_init(void);
  30 BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
  31         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  32         BlockDriverCompletionFunc *cb, void *opaque, int type);
  33 BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
  34         unsigned long int req, void *buf,
  35         BlockDriverCompletionFunc *cb, void *opaque);
  36
  37 /* linux-aio.c - Linux native implementation */
  38 void *laio_init(void);
  39 BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
  40         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
  41         BlockDriverCompletionFunc *cb, void *opaque, int type);
  42
  43 #endif /* QEMU_RAW_POSIX_AIO_H */