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
  17 struct 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  */
  27 struct dm_rq_clone_bio_info {
  28         struct bio *orig;
  29         struct dm_rq_target_io *tio;
  30         struct bio clone;
  31 };
  32
  33 int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
  34 void dm_mq_cleanup_mapped_device(struct mapped_device *md);
  35
  36 void dm_start_queue(struct request_queue *q);
  37 void dm_stop_queue(struct request_queue *q);
  38
  39 void dm_mq_kick_requeue_list(struct mapped_device *md);
  40
  41 unsigned dm_get_reserved_rq_based_ios(void);
  42
  43 ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
  44 ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
  45                                                      const char *buf, size_t count);
  46
  47 #endif