posix-aio-compat.h

   1 /*
   2  * QEMU posix-aio emulation
   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
  14 #ifndef QEMU_POSIX_AIO_COMPAT_H
  15 #define QEMU_POSIX_AIO_COMPAT_H
  16
  17 #include <sys/types.h>
  18 #include <unistd.h>
  19 #include <signal.h>
  20
  21 #include "sys-queue.h"
  22
  23 #define QEMU_PAIO_CANCELED     0x01
  24 #define QEMU_PAIO_NOTCANCELED  0x02
  25 #define QEMU_PAIO_ALLDONE      0x03
  26
  27 struct qemu_paiocb
  28 {
  29     int aio_fildes;
  30     union {
  31         struct iovec *aio_iov;
  32         void *aio_ioctl_buf;
  33     };
  34     int aio_niov;
  35     size_t aio_nbytes;
  36 #define aio_ioctl_cmd   aio_nbytes /* for QEMU_PAIO_IOCTL */
  37     int ev_signo;
  38     off_t aio_offset;
  39     unsigned aio_flags;
  40 /* 512 byte alignment required for buffer, offset and length */
  41 #define QEMU_AIO_SECTOR_ALIGNED 0x01
  42
  43     /* private */
  44     TAILQ_ENTRY(qemu_paiocb) node;
  45     int aio_type;
  46 #define QEMU_PAIO_READ         0x01
  47 #define QEMU_PAIO_WRITE        0x02
  48 #define QEMU_PAIO_IOCTL        0x03
  49     ssize_t ret;
  50     int active;
  51 };
  52
  53 struct qemu_paioinit
  54 {
  55     unsigned int aio_threads;
  56     unsigned int aio_num;
  57     unsigned int aio_idle_time;
  58 };
  59
  60 int qemu_paio_init(struct qemu_paioinit *aioinit);
  61 int qemu_paio_read(struct qemu_paiocb *aiocb);
  62 int qemu_paio_write(struct qemu_paiocb *aiocb);
  63 int qemu_paio_ioctl(struct qemu_paiocb *aiocb);
  64 int qemu_paio_error(struct qemu_paiocb *aiocb);
  65 ssize_t qemu_paio_return(struct qemu_paiocb *aiocb);
  66 int qemu_paio_cancel(int fd, struct qemu_paiocb *aiocb);
  67
  68 #endif