dm: move request-based code out to dm-rq.[hc]

#

dm-mod-y	+= dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \

		   dm-ioctl.o dm-io.o dm-kcopyd.o dm-sysfs.o dm-stats.o

		   dm-ioctl.o dm-io.o dm-kcopyd.o dm-sysfs.o dm-stats.o \

		   dm-rq.o

dm-multipath-y	+= dm-path-selector.o dm-mpath.o

dm-snapshot-y	+= dm-snap.o dm-exception-store.o dm-snap-transient.o \

		    dm-snap-persistent.o

#include "dm.h"

#include "dm-core.h"

/*

 * The kobject release method must not be placed in the module itself,

/*

 * Internal header file _only_ for device mapper core

 *

 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.

 *

 * This file is released under the LGPL.

 */

#ifndef DM_CORE_INTERNAL_H

#define DM_CORE_INTERNAL_H

#include <linux/kthread.h>

#include <linux/ktime.h>

#include <linux/blk-mq.h>

#include <trace/events/block.h>

#include "dm.h"

#define DM_RESERVED_MAX_IOS		1024

struct dm_kobject_holder {

	struct kobject kobj;

	struct completion completion;

};

/*

 * DM core internal structure that used directly by dm.c and dm-rq.c

 * DM targets must _not_ deference a mapped_device to directly access its members!

 */

struct mapped_device {

	struct srcu_struct io_barrier;

	struct mutex suspend_lock;

	/*

	 * The current mapping (struct dm_table *).

	 * Use dm_get_live_table{_fast} or take suspend_lock for

	 * dereference.

	 */

	void __rcu *map;

	struct list_head table_devices;

	struct mutex table_devices_lock;

	unsigned long flags;

	struct request_queue *queue;

	int numa_node_id;

	unsigned type;

	/* Protect queue and type against concurrent access. */

	struct mutex type_lock;

	atomic_t holders;

	atomic_t open_count;

	struct dm_target *immutable_target;

	struct target_type *immutable_target_type;

	struct gendisk *disk;

	char name[16];

	void *interface_ptr;

	/*

	 * A list of ios that arrived while we were suspended.

	 */

	atomic_t pending[2];

	wait_queue_head_t wait;

	struct work_struct work;

	spinlock_t deferred_lock;

	struct bio_list deferred;

	/*

	 * Event handling.

	 */

	wait_queue_head_t eventq;

	atomic_t event_nr;

	atomic_t uevent_seq;

	struct list_head uevent_list;

	spinlock_t uevent_lock; /* Protect access to uevent_list */

	/* the number of internal suspends */

	unsigned internal_suspend_count;

	/*

	 * Processing queue (flush)

	 */

	struct workqueue_struct *wq;

	/*

	 * io objects are allocated from here.

	 */

	mempool_t *io_pool;

	mempool_t *rq_pool;

	struct bio_set *bs;

	/*

	 * freeze/thaw support require holding onto a super block

	 */

	struct super_block *frozen_sb;

	/* forced geometry settings */

	struct hd_geometry geometry;

	struct block_device *bdev;

	/* kobject and completion */

	struct dm_kobject_holder kobj_holder;

	/* zero-length flush that will be cloned and submitted to targets */

	struct bio flush_bio;

	struct dm_stats stats;

	struct kthread_worker kworker;

	struct task_struct *kworker_task;

	/* for request-based merge heuristic in dm_request_fn() */

	unsigned seq_rq_merge_deadline_usecs;

	int last_rq_rw;

	sector_t last_rq_pos;

	ktime_t last_rq_start_time;

	/* for blk-mq request-based DM support */

	struct blk_mq_tag_set *tag_set;

	bool use_blk_mq:1;

	bool init_tio_pdu:1;

};

void dm_init_md_queue(struct mapped_device *md);

void dm_init_normal_md_queue(struct mapped_device *md);

int md_in_flight(struct mapped_device *md);

void disable_write_same(struct mapped_device *md);

static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)

{

	return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;

}

unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max);

static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)

{

	return !maxlen || strlen(result) + 1 >= maxlen;

}

#endif

 * This file is released under the GPL.

 */

#include "dm.h"

#include "dm-core.h"

#include <linux/device-mapper.h>

 * This file is released under the GPL.

 */

#include "dm.h"

#include "dm-core.h"

#include <linux/module.h>

#include <linux/vmalloc.h>