drivers/md/dm-rq.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Internal header file for device mapper
   4  *
   5  * Copyright (C) 2016 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is released under the LGPL.
   8  */
   9
  10 #ifndef DM_RQ_INTERNAL_H
  11 #define DM_RQ_INTERNAL_H
  12
  13 #include <linux/bio.h>
  14 #include <linux/kthread.h>
  15
  16 #include "dm-stats.h"
  17
  18 struct mapped_device;
  19
  20 /*
  21  * For request-based dm - the bio clones we allocate are embedded in these
  22  * structs.
  23  *
  24  * We allocate these with bio_alloc_bioset, using the front_pad parameter when
  25  * the bioset is created - this means the bio has to come at the end of the
  26  * struct.
  27  */
  28 struct dm_rq_clone_bio_info {
  29         struct bio *orig;
  30         struct dm_rq_target_io *tio;
  31         struct bio clone;
  32 };
  33
  34 int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
  35 void dm_mq_cleanup_mapped_device(struct mapped_device *md);
  36
  37 void dm_start_queue(struct request_queue *q);
  38 void dm_stop_queue(struct request_queue *q);
  39
  40 void dm_mq_kick_requeue_list(struct mapped_device *md);
  41
  42 unsigned int dm_get_reserved_rq_based_ios(void);
  43
  44 ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
  45 ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
  46                                                      const char *buf, size_t count);
  47
  48 #endif