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 49