[linux.git] / block / blk.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BLK_INTERNAL_H
#define BLK_INTERNAL_H

#include <linux/idr.h>
#include <linux/blk-mq.h>
#include <xen/xen.h>
#include "blk-mq.h"

/* Max future timer expiry for timeouts */
#define BLK_MAX_TIMEOUT		(5 * HZ)

#ifdef CONFIG_DEBUG_FS
extern struct dentry *blk_debugfs_root;
#endif

struct blk_flush_queue {
	unsigned int		flush_queue_delayed:1;
	unsigned int		flush_pending_idx:1;
	unsigned int		flush_running_idx:1;
	unsigned long		flush_pending_since;
	struct list_head	flush_queue[2];
	struct list_head	flush_data_in_flight;
	struct request		*flush_rq;

	/*
	 * flush_rq shares tag with this rq, both can't be active
	 * at the same time
	 */
	struct request		*orig_rq;
	spinlock_t		mq_flush_lock;
};

extern struct kmem_cache *blk_requestq_cachep;
extern struct kobj_type blk_queue_ktype;
extern struct ida blk_queue_ida;

static inline struct blk_flush_queue *
blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
{
	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
}

static inline void __blk_get_queue(struct request_queue *q)
{
	kobject_get(&q->kobj);
}

struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
		int node, int cmd_size, gfp_t flags);
void blk_free_flush_queue(struct blk_flush_queue *q);

void blk_exit_queue(struct request_queue *q);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
			struct bio *bio);
void blk_freeze_queue(struct request_queue *q);

static inline void blk_queue_enter_live(struct request_queue *q)
{
	/*
	 * Given that running in generic_make_request() context
	 * guarantees that a live reference against q_usage_counter has
	 * been established, further references under that same context
	 * need not check that the queue has been frozen (marked dead).
	 */
	percpu_ref_get(&q->q_usage_counter);
}

static inline bool biovec_phys_mergeable(struct request_queue *q,
		struct bio_vec *vec1, struct bio_vec *vec2)
{
	unsigned long mask = queue_segment_boundary(q);
	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;

	if (addr1 + vec1->bv_len != addr2)
		return false;
	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2))
		return false;
	if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
		return false;
	return true;
}

static inline bool __bvec_gap_to_prev(struct request_queue *q,
		struct bio_vec *bprv, unsigned int offset)
{
	return (offset & queue_virt_boundary(q)) ||
		((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
}

/*
 * Check if adding a bio_vec after bprv with offset would create a gap in
 * the SG list. Most drivers don't care about this, but some do.
 */
static inline bool bvec_gap_to_prev(struct request_queue *q,
		struct bio_vec *bprv, unsigned int offset)
{
	if (!queue_virt_boundary(q))
		return false;
	return __bvec_gap_to_prev(q, bprv, offset);
}

#ifdef CONFIG_BLK_DEV_INTEGRITY
void blk_flush_integrity(void);
bool __bio_integrity_endio(struct bio *);
static inline bool bio_integrity_endio(struct bio *bio)
{
	if (bio_integrity(bio))
		return __bio_integrity_endio(bio);
	return true;
}

static inline bool integrity_req_gap_back_merge(struct request *req,
		struct bio *next)
{
	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	struct bio_integrity_payload *bip_next = bio_integrity(next);

	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
				bip_next->bip_vec[0].bv_offset);
}

static inline bool integrity_req_gap_front_merge(struct request *req,
		struct bio *bio)
{
	struct bio_integrity_payload *bip = bio_integrity(bio);
	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);

	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
				bip_next->bip_vec[0].bv_offset);
}
#else /* CONFIG_BLK_DEV_INTEGRITY */
static inline bool integrity_req_gap_back_merge(struct request *req,
		struct bio *next)
{
	return false;
}
static inline bool integrity_req_gap_front_merge(struct request *req,
		struct bio *bio)
{
	return false;
}

static inline void blk_flush_integrity(void)
{
}
static inline bool bio_integrity_endio(struct bio *bio)
{
	return true;
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

unsigned long blk_rq_timeout(unsigned long timeout);
void blk_add_timer(struct request *req);

bool bio_attempt_front_merge(struct request_queue *q, struct request *req,
			     struct bio *bio);
bool bio_attempt_back_merge(struct request_queue *q, struct request *req,
			    struct bio *bio);
bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
		struct bio *bio);
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
			    struct request **same_queue_rq);

void blk_account_io_start(struct request *req, bool new_io);
void blk_account_io_completion(struct request *req, unsigned int bytes);
void blk_account_io_done(struct request *req, u64 now);

/*
 * Internal elevator interface
 */
#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)

void blk_insert_flush(struct request *rq);

int elevator_init_mq(struct request_queue *q);
int elevator_switch_mq(struct request_queue *q,
			      struct elevator_type *new_e);
void elevator_exit(struct request_queue *, struct elevator_queue *);
int elv_register_queue(struct request_queue *q);
void elv_unregister_queue(struct request_queue *q);

struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);

#ifdef CONFIG_FAIL_IO_TIMEOUT
int blk_should_fake_timeout(struct request_queue *);
ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
ssize_t part_timeout_store(struct device *, struct device_attribute *,
				const char *, size_t);
#else
static inline int blk_should_fake_timeout(struct request_queue *q)
{
	return 0;
}
#endif

int ll_back_merge_fn(struct request_queue *q, struct request *req,
		     struct bio *bio);
int ll_front_merge_fn(struct request_queue *q, struct request *req, 
		      struct bio *bio);
struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
				struct request *next);
void blk_recalc_rq_segments(struct request *rq);
void blk_rq_set_mixed_merge(struct request *rq);
bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);

int blk_dev_init(void);

/*
 * Contribute to IO statistics IFF:
 *
 *	a) it's attached to a gendisk, and
 *	b) the queue had IO stats enabled when this request was started, and
 *	c) it's a file system request
 */
static inline bool blk_do_io_stat(struct request *rq)
{
	return rq->rq_disk &&
	       (rq->rq_flags & RQF_IO_STAT) &&
		!blk_rq_is_passthrough(rq);
}

static inline void req_set_nomerge(struct request_queue *q, struct request *req)
{
	req->cmd_flags |= REQ_NOMERGE;
	if (req == q->last_merge)
		q->last_merge = NULL;
}

/*
 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
 * is defined as 'unsigned int', meantime it has to aligned to with logical
 * block size which is the minimum accepted unit by hardware.
 */
static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
{
	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
}

/*
 * Internal io_context interface
 */
void get_io_context(struct io_context *ioc);
struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
			     gfp_t gfp_mask);
void ioc_clear_queue(struct request_queue *q);

int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);

/**
 * create_io_context - try to create task->io_context
 * @gfp_mask: allocation mask
 * @node: allocation node
 *
 * If %current->io_context is %NULL, allocate a new io_context and install
 * it.  Returns the current %current->io_context which may be %NULL if
 * allocation failed.
 *
 * Note that this function can't be called with IRQ disabled because
 * task_lock which protects %current->io_context is IRQ-unsafe.
 */
static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
{
	WARN_ON_ONCE(irqs_disabled());
	if (unlikely(!current->io_context))
		create_task_io_context(current, gfp_mask, node);
	return current->io_context;
}

/*
 * Internal throttling interface
 */
#ifdef CONFIG_BLK_DEV_THROTTLING
extern void blk_throtl_drain(struct request_queue *q);
extern int blk_throtl_init(struct request_queue *q);
extern void blk_throtl_exit(struct request_queue *q);
extern void blk_throtl_register_queue(struct request_queue *q);
#else /* CONFIG_BLK_DEV_THROTTLING */
static inline void blk_throtl_drain(struct request_queue *q) { }
static inline int blk_throtl_init(struct request_queue *q) { return 0; }
static inline void blk_throtl_exit(struct request_queue *q) { }
static inline void blk_throtl_register_queue(struct request_queue *q) { }
#endif /* CONFIG_BLK_DEV_THROTTLING */
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	const char *page, size_t count);
extern void blk_throtl_bio_endio(struct bio *bio);
extern void blk_throtl_stat_add(struct request *rq, u64 time);
#else
static inline void blk_throtl_bio_endio(struct bio *bio) { }
static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
#endif

#ifdef CONFIG_BOUNCE
extern int init_emergency_isa_pool(void);
extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
#else
static inline int init_emergency_isa_pool(void)
{
	return 0;
}
static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
{
}
#endif /* CONFIG_BOUNCE */

#ifdef CONFIG_BLK_CGROUP_IOLATENCY
extern int blk_iolatency_init(struct request_queue *q);
#else
static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
#endif

struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);

#ifdef CONFIG_BLK_DEV_ZONED
void blk_queue_free_zone_bitmaps(struct request_queue *q);
#else
static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
#endif

#endif /* BLK_INTERNAL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
8324aa91 JA	2	#ifndef BLK_INTERNAL_H
	3	#define BLK_INTERNAL_H
	4
a73f730d	5	#include <linux/idr.h>
f70ced09	6	#include <linux/blk-mq.h>
c39ae60d	7	#include <xen/xen.h>
f70ced09	8	#include "blk-mq.h"
a73f730d	9
0d2602ca JA	10	/* Max future timer expiry for timeouts */
	11	#define BLK_MAX_TIMEOUT (5 * HZ)
	12
18fbda91 OS	13	#ifdef CONFIG_DEBUG_FS
	14	extern struct dentry *blk_debugfs_root;
	15	#endif
	16
7c94e1c1 ML	17	struct blk_flush_queue {
	18	unsigned int flush_queue_delayed:1;
	19	unsigned int flush_pending_idx:1;
	20	unsigned int flush_running_idx:1;
	21	unsigned long flush_pending_since;
	22	struct list_head flush_queue[2];
	23	struct list_head flush_data_in_flight;
	24	struct request *flush_rq;
0048b483 ML	25
	26	/*
	27	* flush_rq shares tag with this rq, both can't be active
	28	* at the same time
	29	*/
	30	struct request *orig_rq;
7c94e1c1 ML	31	spinlock_t mq_flush_lock;
	32	};
	33
8324aa91 JA	34	extern struct kmem_cache *blk_requestq_cachep;
8324aa91 JA	35	extern struct kobj_type blk_queue_ktype;
a73f730d	36	extern struct ida blk_queue_ida;
8324aa91	37
f9afca4d JA	38	static inline struct blk_flush_queue *
f9afca4d JA	39	blk_get_flush_queue(struct request_queue q, struct blk_mq_ctx ctx)
7c94e1c1	40	{
8ccdf4a3	41	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
7c94e1c1 ML	42	}
7c94e1c1 ML	43
09ac46c4 TH	44	static inline void __blk_get_queue(struct request_queue *q)
	45	{
	46	kobject_get(&q->kobj);
	47	}
	48
f70ced09	49	struct blk_flush_queue blk_alloc_flush_queue(struct request_queue q,
5b202853	50	int node, int cmd_size, gfp_t flags);
f70ced09	51	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	52
4cf6324b	53	void blk_exit_queue(struct request_queue *q);
86db1e29 JA	54	void blk_rq_bio_prep(struct request_queue q, struct request rq,
86db1e29 JA	55	struct bio *bio);
3ef28e83 DW	56	void blk_freeze_queue(struct request_queue *q);
	57
	58	static inline void blk_queue_enter_live(struct request_queue *q)
	59	{
	60	/*
	61	* Given that running in generic_make_request() context
	62	* guarantees that a live reference against q_usage_counter has
	63	* been established, further references under that same context
	64	* need not check that the queue has been frozen (marked dead).
	65	*/
	66	percpu_ref_get(&q->q_usage_counter);
	67	}
8324aa91	68
3dccdae5 CH	69	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	70	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	71	{
3dccdae5	72	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	73	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	74	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	75
3dccdae5 CH	76	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	77	return false;
c39ae60d	78	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2))
6a9f5f24	79	return false;
3dccdae5 CH	80	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	81	return false;
6a9f5f24 CH	82	return true;
	83	}
	84
27ca1d4e CH	85	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	86	struct bio_vec *bprv, unsigned int offset)
	87	{
df376b2e	88	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	89	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	90	}
	91
	92	/*
	93	* Check if adding a bio_vec after bprv with offset would create a gap in
	94	* the SG list. Most drivers don't care about this, but some do.
	95	*/
	96	static inline bool bvec_gap_to_prev(struct request_queue *q,
	97	struct bio_vec *bprv, unsigned int offset)
	98	{
	99	if (!queue_virt_boundary(q))
	100	return false;
	101	return __bvec_gap_to_prev(q, bprv, offset);
	102	}
	103
5a48fc14 DW	104	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	105	void blk_flush_integrity(void);
7c20f116 CH	106	bool __bio_integrity_endio(struct bio *);
	107	static inline bool bio_integrity_endio(struct bio *bio)
	108	{
	109	if (bio_integrity(bio))
	110	return __bio_integrity_endio(bio);
	111	return true;
	112	}
43b729bf CH	113
	114	static inline bool integrity_req_gap_back_merge(struct request *req,
	115	struct bio *next)
	116	{
	117	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	118	struct bio_integrity_payload *bip_next = bio_integrity(next);
	119
	120	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	121	bip_next->bip_vec[0].bv_offset);
	122	}
	123
	124	static inline bool integrity_req_gap_front_merge(struct request *req,
	125	struct bio *bio)
	126	{
	127	struct bio_integrity_payload *bip = bio_integrity(bio);
	128	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	129
	130	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	131	bip_next->bip_vec[0].bv_offset);
	132	}
	133	#else /* CONFIG_BLK_DEV_INTEGRITY */
	134	static inline bool integrity_req_gap_back_merge(struct request *req,
	135	struct bio *next)
	136	{
	137	return false;
	138	}
	139	static inline bool integrity_req_gap_front_merge(struct request *req,
	140	struct bio *bio)
	141	{
	142	return false;
	143	}
	144
5a48fc14 DW	145	static inline void blk_flush_integrity(void)
	146	{
	147	}
7c20f116 CH	148	static inline bool bio_integrity_endio(struct bio *bio)
	149	{
	150	return true;
	151	}
43b729bf	152	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	153
0d2602ca	154	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	155	void blk_add_timer(struct request *req);
320ae51f JA	156
	157	bool bio_attempt_front_merge(struct request_queue q, struct request req,
	158	struct bio *bio);
	159	bool bio_attempt_back_merge(struct request_queue q, struct request req,
	160	struct bio *bio);
1e739730 CH	161	bool bio_attempt_discard_merge(struct request_queue q, struct request req,
1e739730 CH	162	struct bio *bio);
320ae51f	163	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
5b3f341f	164	struct request **same_queue_rq);
320ae51f JA	165
	166	void blk_account_io_start(struct request *req, bool new_io);
	167	void blk_account_io_completion(struct request *req, unsigned int bytes);
522a7775	168	void blk_account_io_done(struct request *req, u64 now);
320ae51f	169
158dbda0 TH	170	/*
	171	* Internal elevator interface
	172	*/
e8064021	173	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	174
ae1b1539	175	void blk_insert_flush(struct request *rq);
dd831006	176
131d08e1	177	int elevator_init_mq(struct request_queue *q);
d48ece20 JW	178	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	179	struct elevator_type *new_e);
a8a275c9	180	void elevator_exit(struct request_queue , struct elevator_queue );
83d016ac BVA	181	int elv_register_queue(struct request_queue *q);
	182	void elv_unregister_queue(struct request_queue *q);
	183
807d4af2 CH	184	struct hd_struct __disk_get_part(struct gendisk disk, int partno);
807d4af2 CH	185
581d4e28 JA	186	#ifdef CONFIG_FAIL_IO_TIMEOUT
	187	int blk_should_fake_timeout(struct request_queue *);
	188	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	189	ssize_t part_timeout_store(struct device , struct device_attribute ,
	190	const char *, size_t);
	191	#else
	192	static inline int blk_should_fake_timeout(struct request_queue *q)
	193	{
	194	return 0;
	195	}
	196	#endif
	197
d6d48196 JA	198	int ll_back_merge_fn(struct request_queue q, struct request req,
	199	struct bio *bio);
	200	int ll_front_merge_fn(struct request_queue q, struct request req,
	201	struct bio *bio);
b973cb7e JA	202	struct request attempt_back_merge(struct request_queue q, struct request *rq);
b973cb7e JA	203	struct request attempt_front_merge(struct request_queue q, struct request *rq);
5e84ea3a JA	204	int blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a JA	205	struct request *next);
d6d48196	206	void blk_recalc_rq_segments(struct request *rq);
80a761fd	207	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	208	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	209	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	210
ff88972c AB	211	int blk_dev_init(void);
ff88972c AB	212
c2553b58 JA	213	/*
	214	* Contribute to IO statistics IFF:
	215	*
	216	* a) it's attached to a gendisk, and
	217	* b) the queue had IO stats enabled when this request was started, and
e2a60da7	218	* c) it's a file system request
c2553b58	219	*/
599d067d	220	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	221	{
33659ebb	222	return rq->rq_disk &&
e8064021	223	(rq->rq_flags & RQF_IO_STAT) &&
57292b58	224	!blk_rq_is_passthrough(rq);
fb8ec18c JA	225	}
fb8ec18c JA	226
6cf7677f CH	227	static inline void req_set_nomerge(struct request_queue q, struct request req)
	228	{
	229	req->cmd_flags \|= REQ_NOMERGE;
	230	if (req == q->last_merge)
	231	q->last_merge = NULL;
	232	}
	233
1adfc5e4 ML	234	/*
	235	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	236	* is defined as 'unsigned int', meantime it has to aligned to with logical
	237	* block size which is the minimum accepted unit by hardware.
	238	*/
	239	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	240	{
	241	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	242	}
	243
f2dbd76a TH	244	/*
	245	* Internal io_context interface
	246	*/
	247	void get_io_context(struct io_context *ioc);
47fdd4ca	248	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	249	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	250	gfp_t gfp_mask);
7e5a8794	251	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	252
24acfc34	253	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a TH	254
	255	/**
	256	* create_io_context - try to create task->io_context
f2dbd76a TH	257	* @gfp_mask: allocation mask
	258	* @node: allocation node
	259	*
24acfc34 TH	260	* If %current->io_context is %NULL, allocate a new io_context and install
	261	* it. Returns the current %current->io_context which may be %NULL if
	262	* allocation failed.
f2dbd76a TH	263	*
f2dbd76a TH	264	* Note that this function can't be called with IRQ disabled because
24acfc34	265	* task_lock which protects %current->io_context is IRQ-unsafe.
f2dbd76a	266	*/
24acfc34	267	static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
f2dbd76a TH	268	{
f2dbd76a TH	269	WARN_ON_ONCE(irqs_disabled());
24acfc34 TH	270	if (unlikely(!current->io_context))
	271	create_task_io_context(current, gfp_mask, node);
	272	return current->io_context;
f2dbd76a TH	273	}
	274
	275	/*
	276	* Internal throttling interface
	277	*/
bc9fcbf9	278	#ifdef CONFIG_BLK_DEV_THROTTLING
c9a929dd	279	extern void blk_throtl_drain(struct request_queue *q);
bc9fcbf9 TH	280	extern int blk_throtl_init(struct request_queue *q);
bc9fcbf9 TH	281	extern void blk_throtl_exit(struct request_queue *q);
d61fcfa4	282	extern void blk_throtl_register_queue(struct request_queue *q);
bc9fcbf9	283	#else /* CONFIG_BLK_DEV_THROTTLING */
c9a929dd	284	static inline void blk_throtl_drain(struct request_queue *q) { }
bc9fcbf9 TH	285	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	286	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	287	static inline void blk_throtl_register_queue(struct request_queue *q) { }
bc9fcbf9	288	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	289	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	290	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	291	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	292	const char *page, size_t count);
9e234eea	293	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	294	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	295	#else
9e234eea SL	296	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	297	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	298	#endif
bc9fcbf9	299
3bce016a CH	300	#ifdef CONFIG_BOUNCE
	301	extern int init_emergency_isa_pool(void);
	302	extern void blk_queue_bounce(struct request_queue q, struct bio *bio);
	303	#else
	304	static inline int init_emergency_isa_pool(void)
	305	{
	306	return 0;
	307	}
	308	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
	309	{
	310	}
	311	#endif /* CONFIG_BOUNCE */
	312
d7067512 JB	313	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	314	extern int blk_iolatency_init(struct request_queue *q);
	315	#else
	316	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	317	#endif
	318
a2d6b3a2 DLM	319	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	320
bf505456 DLM	321	#ifdef CONFIG_BLK_DEV_ZONED
	322	void blk_queue_free_zone_bitmaps(struct request_queue *q);
	323	#else
	324	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
	325	#endif
	326
bc9fcbf9	327	#endif /* BLK_INTERNAL_H */