/* * Internal header file for device mapper * * Copyright (C) 2016 Red Hat, Inc. All rights reserved. * * This file is released under the LGPL. */ #ifndef DM_RQ_INTERNAL_H #define DM_RQ_INTERNAL_H #include <linux/bio.h> #include <linux/kthread.h> #include "dm-stats.h" struct mapped_device; /* * One of these is allocated per request. */ struct dm_rq_target_io { struct mapped_device *md; struct dm_target *ti; struct request *orig, *clone; struct kthread_work work; blk_status_t error; union map_info info; struct dm_stats_aux stats_aux; unsigned long duration_jiffies; unsigned n_sectors; unsigned completed; }; /* * For request-based dm - the bio clones we allocate are embedded in these * structs. * * We allocate these with bio_alloc_bioset, using the front_pad parameter when * the bioset is created - this means the bio has to come at the end of the * struct. */ struct dm_rq_clone_bio_info { struct bio *orig; struct dm_rq_target_io *tio; struct bio clone; }; int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t); void dm_mq_cleanup_mapped_device(struct mapped_device *md); void dm_start_queue(struct request_queue *q); void dm_stop_queue(struct request_queue *q); void dm_mq_kick_requeue_list(struct mapped_device *md); unsigned dm_get_reserved_rq_based_ios(void); ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf); ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md, const char *buf, size_t count); #endif