block/export/virtio-blk-handler.h

   1 /*
   2  * Handler for virtio-blk I/O
   3  *
   4  * Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved.
   5  *
   6  * Author:
   7  *   Xie Yongji <xieyongji@bytedance.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or
  10  * later.  See the COPYING file in the top-level directory.
  11  */
  12
  13 #ifndef VIRTIO_BLK_HANDLER_H
  14 #define VIRTIO_BLK_HANDLER_H
  15
  16 #include "sysemu/block-backend.h"
  17
  18 #define VIRTIO_BLK_SECTOR_BITS 9
  19 #define VIRTIO_BLK_SECTOR_SIZE (1ULL << VIRTIO_BLK_SECTOR_BITS)
  20
  21 #define VIRTIO_BLK_MAX_DISCARD_SECTORS 32768
  22 #define VIRTIO_BLK_MAX_WRITE_ZEROES_SECTORS 32768
  23
  24 typedef struct {
  25     BlockBackend *blk;
  26     char *serial;
  27     uint32_t logical_block_size;
  28     bool writable;
  29 } VirtioBlkHandler;
  30
  31 int coroutine_fn virtio_blk_process_req(VirtioBlkHandler *handler,
  32                                         struct iovec *in_iov,
  33                                         struct iovec *out_iov,
  34                                         unsigned int in_num,
  35                                         unsigned int out_num);
  36
  37 #endif /* VIRTIO_BLK_HANDLER_H */