LXR linux/drivers/md/dm-rq.h

   1/*
   2 * Internal header file for device mapper
   3 *
   4 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.
   5 *
   6 * This file is released under the LGPL.
   7 */
   8
   9#ifndef DM_RQ_INTERNAL_H
  10#define DM_RQ_INTERNAL_H
  11
  12#include <linux/bio.h>
  13#include <linux/kthread.h>
  14
  15#include "dm-stats.h"
  16
  17struct mapped_device;
  18
  19/*
  20 * For request-based dm - the bio clones we allocate are embedded in these
  21 * structs.
  22 *
  23 * We allocate these with bio_alloc_bioset, using the front_pad parameter when
  24 * the bioset is created - this means the bio has to come at the end of the
  25 * struct.
  26 */
  27struct dm_rq_clone_bio_info {
  28        struct bio *orig;
  29        struct dm_rq_target_io *tio;
  30        struct bio clone;
  31};
  32
  33int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
  34void dm_mq_cleanup_mapped_device(struct mapped_device *md);
  35
  36void dm_start_queue(struct request_queue *q);
  37void dm_stop_queue(struct request_queue *q);
  38
  39void dm_mq_kick_requeue_list(struct mapped_device *md);
  40
  41unsigned dm_get_reserved_rq_based_ios(void);
  42
  43ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
  44ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
  45                                                     const char *buf, size_t count);
  46
  47#endif
  48