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
  34 struct 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