[linux-2.6-block.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"
#include "blk-mq-sched.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;
	blk_status_t 		rq_status;
	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);
}

static inline bool
is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
{
	return hctx->fq->flush_rq == req;
}

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_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->bv_page))
		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);
}

static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
		unsigned int nr_segs)
{
	rq->nr_phys_segments = nr_segs;
	rq->__data_len = bio->bi_iter.bi_size;
	rq->bio = rq->biotail = bio;
	rq->ioprio = bio_prio(bio);

	if (bio->bi_disk)
		rq->rq_disk = bio->bi_disk;
}

#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 *req, struct bio *bio,
		unsigned int nr_segs);
bool bio_attempt_back_merge(struct request *req, struct bio *bio,
		unsigned int nr_segs);
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,
		unsigned int nr_segs, 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);

void 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, bool uevent);
void elv_unregister_queue(struct request_queue *q);

static inline void elevator_exit(struct request_queue *q,
		struct elevator_queue *e)
{
	lockdep_assert_held(&q->sysfs_lock);

	blk_mq_sched_free_requests(q);
	__elevator_exit(q, e);
}

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

void __blk_queue_split(struct request_queue *q, struct bio **bio,
		unsigned int *nr_segs);
int ll_back_merge_fn(struct request *req, struct bio *bio,
		unsigned int nr_segs);
int ll_front_merge_fn(struct request *req,  struct bio *bio,
		unsigned int nr_segs);
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);
unsigned int 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"
c3e22192	9	#include "blk-mq-sched.h"
a73f730d	10
0d2602ca JA	11	/* Max future timer expiry for timeouts */
	12	#define BLK_MAX_TIMEOUT (5 * HZ)
	13
18fbda91 OS	14	#ifdef CONFIG_DEBUG_FS
	15	extern struct dentry *blk_debugfs_root;
	16	#endif
	17
7c94e1c1 ML	18	struct blk_flush_queue {
	19	unsigned int flush_queue_delayed:1;
	20	unsigned int flush_pending_idx:1;
	21	unsigned int flush_running_idx:1;
8d699663	22	blk_status_t rq_status;
7c94e1c1 ML	23	unsigned long flush_pending_since;
	24	struct list_head flush_queue[2];
	25	struct list_head flush_data_in_flight;
	26	struct request *flush_rq;
0048b483 ML	27
	28	/*
	29	* flush_rq shares tag with this rq, both can't be active
	30	* at the same time
	31	*/
	32	struct request *orig_rq;
7c94e1c1 ML	33	spinlock_t mq_flush_lock;
	34	};
	35
8324aa91 JA	36	extern struct kmem_cache *blk_requestq_cachep;
8324aa91 JA	37	extern struct kobj_type blk_queue_ktype;
a73f730d	38	extern struct ida blk_queue_ida;
8324aa91	39
f9afca4d JA	40	static inline struct blk_flush_queue *
f9afca4d JA	41	blk_get_flush_queue(struct request_queue q, struct blk_mq_ctx ctx)
7c94e1c1	42	{
8ccdf4a3	43	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
7c94e1c1 ML	44	}
7c94e1c1 ML	45
09ac46c4 TH	46	static inline void __blk_get_queue(struct request_queue *q)
	47	{
	48	kobject_get(&q->kobj);
	49	}
	50
8d699663 YY	51	static inline bool
	52	is_flush_rq(struct request req, struct blk_mq_hw_ctx hctx)
	53	{
	54	return hctx->fq->flush_rq == req;
	55	}
	56
f70ced09	57	struct blk_flush_queue blk_alloc_flush_queue(struct request_queue q,
5b202853	58	int node, int cmd_size, gfp_t flags);
f70ced09	59	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	60
3ef28e83 DW	61	void blk_freeze_queue(struct request_queue *q);
	62
	63	static inline void blk_queue_enter_live(struct request_queue *q)
	64	{
	65	/*
	66	* Given that running in generic_make_request() context
	67	* guarantees that a live reference against q_usage_counter has
	68	* been established, further references under that same context
	69	* need not check that the queue has been frozen (marked dead).
	70	*/
	71	percpu_ref_get(&q->q_usage_counter);
	72	}
8324aa91	73
3dccdae5 CH	74	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	75	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	76	{
3dccdae5	77	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	78	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	79	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	80
3dccdae5 CH	81	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	82	return false;
0383ad43	83	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	84	return false;
3dccdae5 CH	85	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	86	return false;
6a9f5f24 CH	87	return true;
	88	}
	89
27ca1d4e CH	90	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	91	struct bio_vec *bprv, unsigned int offset)
	92	{
df376b2e	93	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	94	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	95	}
	96
	97	/*
	98	* Check if adding a bio_vec after bprv with offset would create a gap in
	99	* the SG list. Most drivers don't care about this, but some do.
	100	*/
	101	static inline bool bvec_gap_to_prev(struct request_queue *q,
	102	struct bio_vec *bprv, unsigned int offset)
	103	{
	104	if (!queue_virt_boundary(q))
	105	return false;
	106	return __bvec_gap_to_prev(q, bprv, offset);
	107	}
	108
1aa0a133 CH	109	static inline void blk_rq_bio_prep(struct request rq, struct bio bio,
	110	unsigned int nr_segs)
	111	{
	112	rq->nr_phys_segments = nr_segs;
	113	rq->__data_len = bio->bi_iter.bi_size;
	114	rq->bio = rq->biotail = bio;
	115	rq->ioprio = bio_prio(bio);
	116
	117	if (bio->bi_disk)
	118	rq->rq_disk = bio->bi_disk;
	119	}
	120
5a48fc14 DW	121	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	122	void blk_flush_integrity(void);
7c20f116 CH	123	bool __bio_integrity_endio(struct bio *);
	124	static inline bool bio_integrity_endio(struct bio *bio)
	125	{
	126	if (bio_integrity(bio))
	127	return __bio_integrity_endio(bio);
	128	return true;
	129	}
43b729bf CH	130
	131	static inline bool integrity_req_gap_back_merge(struct request *req,
	132	struct bio *next)
	133	{
	134	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	135	struct bio_integrity_payload *bip_next = bio_integrity(next);
	136
	137	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	138	bip_next->bip_vec[0].bv_offset);
	139	}
	140
	141	static inline bool integrity_req_gap_front_merge(struct request *req,
	142	struct bio *bio)
	143	{
	144	struct bio_integrity_payload *bip = bio_integrity(bio);
	145	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	146
	147	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	148	bip_next->bip_vec[0].bv_offset);
	149	}
	150	#else /* CONFIG_BLK_DEV_INTEGRITY */
	151	static inline bool integrity_req_gap_back_merge(struct request *req,
	152	struct bio *next)
	153	{
	154	return false;
	155	}
	156	static inline bool integrity_req_gap_front_merge(struct request *req,
	157	struct bio *bio)
	158	{
	159	return false;
	160	}
	161
5a48fc14 DW	162	static inline void blk_flush_integrity(void)
	163	{
	164	}
7c20f116 CH	165	static inline bool bio_integrity_endio(struct bio *bio)
	166	{
	167	return true;
	168	}
43b729bf	169	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	170
0d2602ca	171	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	172	void blk_add_timer(struct request *req);
320ae51f	173
14ccb66b CH	174	bool bio_attempt_front_merge(struct request req, struct bio bio,
	175	unsigned int nr_segs);
	176	bool bio_attempt_back_merge(struct request req, struct bio bio,
	177	unsigned int nr_segs);
1e739730 CH	178	bool bio_attempt_discard_merge(struct request_queue q, struct request req,
1e739730 CH	179	struct bio *bio);
320ae51f	180	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
14ccb66b	181	unsigned int nr_segs, struct request **same_queue_rq);
320ae51f JA	182
	183	void blk_account_io_start(struct request *req, bool new_io);
	184	void blk_account_io_completion(struct request *req, unsigned int bytes);
522a7775	185	void blk_account_io_done(struct request *req, u64 now);
320ae51f	186
158dbda0 TH	187	/*
	188	* Internal elevator interface
	189	*/
e8064021	190	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	191
ae1b1539	192	void blk_insert_flush(struct request *rq);
dd831006	193
954b4a5c	194	void elevator_init_mq(struct request_queue *q);
d48ece20 JW	195	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	196	struct elevator_type *new_e);
c3e22192	197	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	198	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	199	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	200
c3e22192 ML	201	static inline void elevator_exit(struct request_queue *q,
	202	struct elevator_queue *e)
	203	{
284b94be ML	204	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	205
c3e22192 ML	206	blk_mq_sched_free_requests(q);
	207	__elevator_exit(q, e);
	208	}
	209
807d4af2 CH	210	struct hd_struct __disk_get_part(struct gendisk disk, int partno);
807d4af2 CH	211
581d4e28 JA	212	#ifdef CONFIG_FAIL_IO_TIMEOUT
	213	int blk_should_fake_timeout(struct request_queue *);
	214	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	215	ssize_t part_timeout_store(struct device , struct device_attribute ,
	216	const char *, size_t);
	217	#else
	218	static inline int blk_should_fake_timeout(struct request_queue *q)
	219	{
	220	return 0;
	221	}
	222	#endif
	223
14ccb66b CH	224	void __blk_queue_split(struct request_queue q, struct bio *bio,
	225	unsigned int *nr_segs);
	226	int ll_back_merge_fn(struct request req, struct bio bio,
	227	unsigned int nr_segs);
	228	int ll_front_merge_fn(struct request req, struct bio bio,
	229	unsigned int nr_segs);
b973cb7e JA	230	struct request attempt_back_merge(struct request_queue q, struct request *rq);
b973cb7e JA	231	struct request attempt_front_merge(struct request_queue q, struct request *rq);
5e84ea3a JA	232	int blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a JA	233	struct request *next);
e9cd19c0	234	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	235	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	236	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	237	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	238
ff88972c AB	239	int blk_dev_init(void);
ff88972c AB	240
c2553b58 JA	241	/*
	242	* Contribute to IO statistics IFF:
	243	*
	244	* a) it's attached to a gendisk, and
	245	* b) the queue had IO stats enabled when this request was started, and
e2a60da7	246	* c) it's a file system request
c2553b58	247	*/
599d067d	248	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	249	{
33659ebb	250	return rq->rq_disk &&
e8064021	251	(rq->rq_flags & RQF_IO_STAT) &&
57292b58	252	!blk_rq_is_passthrough(rq);
fb8ec18c JA	253	}
fb8ec18c JA	254
6cf7677f CH	255	static inline void req_set_nomerge(struct request_queue q, struct request req)
	256	{
	257	req->cmd_flags \|= REQ_NOMERGE;
	258	if (req == q->last_merge)
	259	q->last_merge = NULL;
	260	}
	261
1adfc5e4 ML	262	/*
	263	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	264	* is defined as 'unsigned int', meantime it has to aligned to with logical
	265	* block size which is the minimum accepted unit by hardware.
	266	*/
	267	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	268	{
	269	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	270	}
	271
f2dbd76a TH	272	/*
	273	* Internal io_context interface
	274	*/
	275	void get_io_context(struct io_context *ioc);
47fdd4ca	276	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	277	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	278	gfp_t gfp_mask);
7e5a8794	279	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	280
24acfc34	281	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a TH	282
	283	/**
	284	* create_io_context - try to create task->io_context
f2dbd76a TH	285	* @gfp_mask: allocation mask
	286	* @node: allocation node
	287	*
24acfc34 TH	288	* If %current->io_context is %NULL, allocate a new io_context and install
	289	* it. Returns the current %current->io_context which may be %NULL if
	290	* allocation failed.
f2dbd76a TH	291	*
f2dbd76a TH	292	* Note that this function can't be called with IRQ disabled because
24acfc34	293	* task_lock which protects %current->io_context is IRQ-unsafe.
f2dbd76a	294	*/
24acfc34	295	static inline struct io_context *create_io_context(gfp_t gfp_mask, int node)
f2dbd76a TH	296	{
f2dbd76a TH	297	WARN_ON_ONCE(irqs_disabled());
24acfc34 TH	298	if (unlikely(!current->io_context))
	299	create_task_io_context(current, gfp_mask, node);
	300	return current->io_context;
f2dbd76a TH	301	}
	302
	303	/*
	304	* Internal throttling interface
	305	*/
bc9fcbf9	306	#ifdef CONFIG_BLK_DEV_THROTTLING
c9a929dd	307	extern void blk_throtl_drain(struct request_queue *q);
bc9fcbf9 TH	308	extern int blk_throtl_init(struct request_queue *q);
bc9fcbf9 TH	309	extern void blk_throtl_exit(struct request_queue *q);
d61fcfa4	310	extern void blk_throtl_register_queue(struct request_queue *q);
bc9fcbf9	311	#else /* CONFIG_BLK_DEV_THROTTLING */
c9a929dd	312	static inline void blk_throtl_drain(struct request_queue *q) { }
bc9fcbf9 TH	313	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	314	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	315	static inline void blk_throtl_register_queue(struct request_queue *q) { }
bc9fcbf9	316	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	317	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	318	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	319	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	320	const char *page, size_t count);
9e234eea	321	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	322	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	323	#else
9e234eea SL	324	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	325	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	326	#endif
bc9fcbf9	327
3bce016a CH	328	#ifdef CONFIG_BOUNCE
	329	extern int init_emergency_isa_pool(void);
	330	extern void blk_queue_bounce(struct request_queue q, struct bio *bio);
	331	#else
	332	static inline int init_emergency_isa_pool(void)
	333	{
	334	return 0;
	335	}
	336	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
	337	{
	338	}
	339	#endif /* CONFIG_BOUNCE */
	340
d7067512 JB	341	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	342	extern int blk_iolatency_init(struct request_queue *q);
	343	#else
	344	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	345	#endif
	346
a2d6b3a2 DLM	347	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	348
bf505456 DLM	349	#ifdef CONFIG_BLK_DEV_ZONED
	350	void blk_queue_free_zone_bitmaps(struct request_queue *q);
	351	#else
	352	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
	353	#endif
	354
bc9fcbf9	355	#endif /* BLK_INTERNAL_H */