LXR qemu/migration/qemu-file-internal.h

   1/*
   2 * QEMU System Emulator
   3 *
   4 * Copyright (c) 2003-2008 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#ifndef QEMU_FILE_INTERNAL_H
  26#define QEMU_FILE_INTERNAL_H 1
  27
  28#include "qemu-common.h"
  29#include "qemu/iov.h"
  30
  31#define IO_BUF_SIZE 32768
  32#define MAX_IOV_SIZE MIN(IOV_MAX, 64)
  33
  34struct QEMUFile {
  35    const QEMUFileOps *ops;
  36    void *opaque;
  37
  38    int64_t bytes_xfer;
  39    int64_t xfer_limit;
  40
  41    int64_t pos; /* start of buffer when writing, end of buffer
  42                    when reading */
  43    int buf_index;
  44    int buf_size; /* 0 when writing */
  45    uint8_t buf[IO_BUF_SIZE];
  46
  47    struct iovec iov[MAX_IOV_SIZE];
  48    unsigned int iovcnt;
  49
  50    int last_error;
  51};
  52
  53#endif
  54