[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 <linux/part_stat.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;
	struct lock_class_key	key;
	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(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 *);
void bio_integrity_free(struct bio *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);
}

void blk_integrity_add(struct gendisk *);
void blk_integrity_del(struct gendisk *);
#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;
}
static inline void bio_integrity_free(struct bio *bio)
{
}
static inline void blk_integrity_add(struct gendisk *disk)
{
}
static inline void blk_integrity_del(struct gendisk *disk)
{
}
#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);

ssize_t part_size_show(struct device *dev, struct device_attribute *attr,
		char *buf);
ssize_t part_stat_show(struct device *dev, struct device_attribute *attr,
		char *buf);
ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr,
		char *buf);
ssize_t part_fail_show(struct device *dev, struct device_attribute *attr,
		char *buf);
ssize_t part_fail_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count);

#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
 */
static inline bool blk_do_io_stat(struct request *rq)
{
	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
}

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);

/*
 * 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

void part_dec_in_flight(struct request_queue *q, struct hd_struct *part,
			int rw);
void part_inc_in_flight(struct request_queue *q, struct hd_struct *part,
			int rw);
void update_io_ticks(struct hd_struct *part, unsigned long now, bool end);
struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector);

int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
void blk_free_devt(dev_t devt);
void blk_invalidate_devt(dev_t devt);
char *disk_name(struct gendisk *hd, int partno, char *buf);
#define ADDPART_FLAG_NONE	0
#define ADDPART_FLAG_RAID	1
#define ADDPART_FLAG_WHOLEDISK	2
void delete_partition(struct gendisk *disk, struct hd_struct *part);
int bdev_add_partition(struct block_device *bdev, int partno,
		sector_t start, sector_t length);
int bdev_del_partition(struct block_device *bdev, int partno);
int bdev_resize_partition(struct block_device *bdev, int partno,
		sector_t start, sector_t length);
int disk_expand_part_tbl(struct gendisk *disk, int target);
int hd_ref_init(struct hd_struct *part);

static inline void hd_struct_get(struct hd_struct *part)
{
	percpu_ref_get(&part->ref);
}

static inline int hd_struct_try_get(struct hd_struct *part)
{
	return percpu_ref_tryget_live(&part->ref);
}

static inline void hd_struct_put(struct hd_struct *part)
{
	percpu_ref_put(&part->ref);
}

static inline void hd_free_part(struct hd_struct *part)
{
	free_part_stats(part);
	kfree(part->info);
	percpu_ref_exit(&part->ref);
}

/*
 * Any access of part->nr_sects which is not protected by partition
 * bd_mutex or gendisk bdev bd_mutex, should be done using this
 * accessor function.
 *
 * Code written along the lines of i_size_read() and i_size_write().
 * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
 * on.
 */
static inline sector_t part_nr_sects_read(struct hd_struct *part)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	sector_t nr_sects;
	unsigned seq;
	do {
		seq = read_seqcount_begin(&part->nr_sects_seq);
		nr_sects = part->nr_sects;
	} while (read_seqcount_retry(&part->nr_sects_seq, seq));
	return nr_sects;
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
	sector_t nr_sects;

	preempt_disable();
	nr_sects = part->nr_sects;
	preempt_enable();
	return nr_sects;
#else
	return part->nr_sects;
#endif
}

/*
 * Should be called with mutex lock held (typically bd_mutex) of partition
 * to provide mutual exlusion among writers otherwise seqcount might be
 * left in wrong state leaving the readers spinning infinitely.
 */
static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	write_seqcount_begin(&part->nr_sects_seq);
	part->nr_sects = size;
	write_seqcount_end(&part->nr_sects_seq);
#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
	preempt_disable();
	part->nr_sects = size;
	preempt_enable();
#else
	part->nr_sects = size;
#endif
}

struct request_queue *__blk_alloc_queue(int node_id);

int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
		struct page *page, unsigned int len, unsigned int offset,
		bool *same_page);

#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>
c6a564ff	7	#include <linux/part_stat.h>
c39ae60d	8	#include <xen/xen.h>
f70ced09	9	#include "blk-mq.h"
c3e22192	10	#include "blk-mq-sched.h"
a73f730d	11
0d2602ca JA	12	/* Max future timer expiry for timeouts */
	13	#define BLK_MAX_TIMEOUT (5 * HZ)
	14
18fbda91 OS	15	#ifdef CONFIG_DEBUG_FS
	16	extern struct dentry *blk_debugfs_root;
	17	#endif
	18
7c94e1c1 ML	19	struct blk_flush_queue {
	20	unsigned int flush_queue_delayed:1;
	21	unsigned int flush_pending_idx:1;
	22	unsigned int flush_running_idx:1;
8d699663	23	blk_status_t rq_status;
7c94e1c1 ML	24	unsigned long flush_pending_since;
	25	struct list_head flush_queue[2];
	26	struct list_head flush_data_in_flight;
	27	struct request *flush_rq;
0048b483 ML	28
	29	/*
	30	* flush_rq shares tag with this rq, both can't be active
	31	* at the same time
	32	*/
	33	struct request *orig_rq;
b3c6a599	34	struct lock_class_key key;
7c94e1c1 ML	35	spinlock_t mq_flush_lock;
	36	};
	37
8324aa91 JA	38	extern struct kmem_cache *blk_requestq_cachep;
8324aa91 JA	39	extern struct kobj_type blk_queue_ktype;
a73f730d	40	extern struct ida blk_queue_ida;
8324aa91	41
f9afca4d JA	42	static inline struct blk_flush_queue *
f9afca4d JA	43	blk_get_flush_queue(struct request_queue q, struct blk_mq_ctx ctx)
7c94e1c1	44	{
8ccdf4a3	45	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
7c94e1c1 ML	46	}
7c94e1c1 ML	47
09ac46c4 TH	48	static inline void __blk_get_queue(struct request_queue *q)
	49	{
	50	kobject_get(&q->kobj);
	51	}
	52
8d699663 YY	53	static inline bool
	54	is_flush_rq(struct request req, struct blk_mq_hw_ctx hctx)
	55	{
	56	return hctx->fq->flush_rq == req;
	57	}
	58
754a1572 GJ	59	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	60	gfp_t flags);
f70ced09	61	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	62
3ef28e83 DW	63	void blk_freeze_queue(struct request_queue *q);
	64
	65	static inline void blk_queue_enter_live(struct request_queue *q)
	66	{
	67	/*
	68	* Given that running in generic_make_request() context
	69	* guarantees that a live reference against q_usage_counter has
	70	* been established, further references under that same context
	71	* need not check that the queue has been frozen (marked dead).
	72	*/
	73	percpu_ref_get(&q->q_usage_counter);
	74	}
8324aa91	75
3dccdae5 CH	76	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	77	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	78	{
3dccdae5	79	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	80	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	81	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	82
3dccdae5 CH	83	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	84	return false;
0383ad43	85	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	86	return false;
3dccdae5 CH	87	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	88	return false;
6a9f5f24 CH	89	return true;
	90	}
	91
27ca1d4e CH	92	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	93	struct bio_vec *bprv, unsigned int offset)
	94	{
df376b2e	95	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	96	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	97	}
	98
	99	/*
	100	* Check if adding a bio_vec after bprv with offset would create a gap in
	101	* the SG list. Most drivers don't care about this, but some do.
	102	*/
	103	static inline bool bvec_gap_to_prev(struct request_queue *q,
	104	struct bio_vec *bprv, unsigned int offset)
	105	{
	106	if (!queue_virt_boundary(q))
	107	return false;
	108	return __bvec_gap_to_prev(q, bprv, offset);
	109	}
	110
1aa0a133 CH	111	static inline void blk_rq_bio_prep(struct request rq, struct bio bio,
	112	unsigned int nr_segs)
	113	{
	114	rq->nr_phys_segments = nr_segs;
	115	rq->__data_len = bio->bi_iter.bi_size;
	116	rq->bio = rq->biotail = bio;
	117	rq->ioprio = bio_prio(bio);
	118
	119	if (bio->bi_disk)
	120	rq->rq_disk = bio->bi_disk;
	121	}
	122
5a48fc14 DW	123	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	124	void blk_flush_integrity(void);
7c20f116	125	bool __bio_integrity_endio(struct bio *);
ece841ab	126	void bio_integrity_free(struct bio *bio);
7c20f116 CH	127	static inline bool bio_integrity_endio(struct bio *bio)
	128	{
	129	if (bio_integrity(bio))
	130	return __bio_integrity_endio(bio);
	131	return true;
	132	}
43b729bf CH	133
	134	static inline bool integrity_req_gap_back_merge(struct request *req,
	135	struct bio *next)
	136	{
	137	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	138	struct bio_integrity_payload *bip_next = bio_integrity(next);
	139
	140	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	141	bip_next->bip_vec[0].bv_offset);
	142	}
	143
	144	static inline bool integrity_req_gap_front_merge(struct request *req,
	145	struct bio *bio)
	146	{
	147	struct bio_integrity_payload *bip = bio_integrity(bio);
	148	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	149
	150	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	151	bip_next->bip_vec[0].bv_offset);
	152	}
581e2600 CH	153
	154	void blk_integrity_add(struct gendisk *);
	155	void blk_integrity_del(struct gendisk *);
43b729bf CH	156	#else /* CONFIG_BLK_DEV_INTEGRITY */
	157	static inline bool integrity_req_gap_back_merge(struct request *req,
	158	struct bio *next)
	159	{
	160	return false;
	161	}
	162	static inline bool integrity_req_gap_front_merge(struct request *req,
	163	struct bio *bio)
	164	{
	165	return false;
	166	}
	167
5a48fc14 DW	168	static inline void blk_flush_integrity(void)
	169	{
	170	}
7c20f116 CH	171	static inline bool bio_integrity_endio(struct bio *bio)
	172	{
	173	return true;
	174	}
ece841ab JT	175	static inline void bio_integrity_free(struct bio *bio)
	176	{
	177	}
581e2600 CH	178	static inline void blk_integrity_add(struct gendisk *disk)
	179	{
	180	}
	181	static inline void blk_integrity_del(struct gendisk *disk)
	182	{
	183	}
43b729bf	184	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	185
0d2602ca	186	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	187	void blk_add_timer(struct request *req);
320ae51f	188
14ccb66b CH	189	bool bio_attempt_front_merge(struct request req, struct bio bio,
	190	unsigned int nr_segs);
	191	bool bio_attempt_back_merge(struct request req, struct bio bio,
	192	unsigned int nr_segs);
1e739730 CH	193	bool bio_attempt_discard_merge(struct request_queue q, struct request req,
1e739730 CH	194	struct bio *bio);
320ae51f	195	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
14ccb66b	196	unsigned int nr_segs, struct request **same_queue_rq);
320ae51f JA	197
	198	void blk_account_io_start(struct request *req, bool new_io);
	199	void blk_account_io_completion(struct request *req, unsigned int bytes);
522a7775	200	void blk_account_io_done(struct request *req, u64 now);
320ae51f	201
158dbda0 TH	202	/*
	203	* Internal elevator interface
	204	*/
e8064021	205	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	206
ae1b1539	207	void blk_insert_flush(struct request *rq);
dd831006	208
954b4a5c	209	void elevator_init_mq(struct request_queue *q);
d48ece20 JW	210	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	211	struct elevator_type *new_e);
c3e22192	212	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	213	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	214	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	215
c3e22192 ML	216	static inline void elevator_exit(struct request_queue *q,
	217	struct elevator_queue *e)
	218	{
284b94be ML	219	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	220
c3e22192 ML	221	blk_mq_sched_free_requests(q);
	222	__elevator_exit(q, e);
	223	}
	224
807d4af2 CH	225	struct hd_struct __disk_get_part(struct gendisk disk, int partno);
807d4af2 CH	226
3ad5cee5 CH	227	ssize_t part_size_show(struct device dev, struct device_attribute attr,
	228	char *buf);
	229	ssize_t part_stat_show(struct device dev, struct device_attribute attr,
	230	char *buf);
	231	ssize_t part_inflight_show(struct device dev, struct device_attribute attr,
	232	char *buf);
	233	ssize_t part_fail_show(struct device dev, struct device_attribute attr,
	234	char *buf);
	235	ssize_t part_fail_store(struct device dev, struct device_attribute attr,
	236	const char *buf, size_t count);
	237
581d4e28 JA	238	#ifdef CONFIG_FAIL_IO_TIMEOUT
	239	int blk_should_fake_timeout(struct request_queue *);
	240	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	241	ssize_t part_timeout_store(struct device , struct device_attribute ,
	242	const char *, size_t);
	243	#else
	244	static inline int blk_should_fake_timeout(struct request_queue *q)
	245	{
	246	return 0;
	247	}
	248	#endif
	249
14ccb66b CH	250	void __blk_queue_split(struct request_queue q, struct bio *bio,
	251	unsigned int *nr_segs);
	252	int ll_back_merge_fn(struct request req, struct bio bio,
	253	unsigned int nr_segs);
	254	int ll_front_merge_fn(struct request req, struct bio bio,
	255	unsigned int nr_segs);
b973cb7e JA	256	struct request attempt_back_merge(struct request_queue q, struct request *rq);
b973cb7e JA	257	struct request attempt_front_merge(struct request_queue q, struct request *rq);
5e84ea3a JA	258	int blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a JA	259	struct request *next);
e9cd19c0	260	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	261	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	262	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	263	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	264
ff88972c AB	265	int blk_dev_init(void);
ff88972c AB	266
c2553b58 JA	267	/*
	268	* Contribute to IO statistics IFF:
	269	*
	270	* a) it's attached to a gendisk, and
48d9b0d4	271	* b) the queue had IO stats enabled when this request was started
c2553b58	272	*/
599d067d	273	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	274	{
48d9b0d4	275	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
fb8ec18c JA	276	}
fb8ec18c JA	277
6cf7677f CH	278	static inline void req_set_nomerge(struct request_queue q, struct request req)
	279	{
	280	req->cmd_flags \|= REQ_NOMERGE;
	281	if (req == q->last_merge)
	282	q->last_merge = NULL;
	283	}
	284
1adfc5e4 ML	285	/*
	286	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	287	* is defined as 'unsigned int', meantime it has to aligned to with logical
	288	* block size which is the minimum accepted unit by hardware.
	289	*/
	290	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	291	{
	292	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	293	}
	294
f2dbd76a TH	295	/*
	296	* Internal io_context interface
	297	*/
	298	void get_io_context(struct io_context *ioc);
47fdd4ca	299	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	300	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	301	gfp_t gfp_mask);
7e5a8794	302	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	303
24acfc34	304	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a	305
f2dbd76a TH	306	/*
	307	* Internal throttling interface
	308	*/
bc9fcbf9	309	#ifdef CONFIG_BLK_DEV_THROTTLING
c9a929dd	310	extern void blk_throtl_drain(struct request_queue *q);
bc9fcbf9 TH	311	extern int blk_throtl_init(struct request_queue *q);
bc9fcbf9 TH	312	extern void blk_throtl_exit(struct request_queue *q);
d61fcfa4	313	extern void blk_throtl_register_queue(struct request_queue *q);
bc9fcbf9	314	#else /* CONFIG_BLK_DEV_THROTTLING */
c9a929dd	315	static inline void blk_throtl_drain(struct request_queue *q) { }
bc9fcbf9 TH	316	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	317	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	318	static inline void blk_throtl_register_queue(struct request_queue *q) { }
bc9fcbf9	319	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	320	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	321	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	322	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	323	const char *page, size_t count);
9e234eea	324	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	325	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	326	#else
9e234eea SL	327	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	328	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	329	#endif
bc9fcbf9	330
3bce016a CH	331	#ifdef CONFIG_BOUNCE
	332	extern int init_emergency_isa_pool(void);
	333	extern void blk_queue_bounce(struct request_queue q, struct bio *bio);
	334	#else
	335	static inline int init_emergency_isa_pool(void)
	336	{
	337	return 0;
	338	}
	339	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
	340	{
	341	}
	342	#endif /* CONFIG_BOUNCE */
	343
d7067512 JB	344	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	345	extern int blk_iolatency_init(struct request_queue *q);
	346	#else
	347	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	348	#endif
	349
a2d6b3a2 DLM	350	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	351
bf505456 DLM	352	#ifdef CONFIG_BLK_DEV_ZONED
	353	void blk_queue_free_zone_bitmaps(struct request_queue *q);
	354	#else
	355	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
	356	#endif
	357
581e2600 CH	358	void part_dec_in_flight(struct request_queue q, struct hd_struct part,
	359	int rw);
	360	void part_inc_in_flight(struct request_queue q, struct hd_struct part,
	361	int rw);
	362	void update_io_ticks(struct hd_struct *part, unsigned long now, bool end);
	363	struct hd_struct disk_map_sector_rcu(struct gendisk disk, sector_t sector);
	364
	365	int blk_alloc_devt(struct hd_struct part, dev_t devt);
	366	void blk_free_devt(dev_t devt);
	367	void blk_invalidate_devt(dev_t devt);
	368	char disk_name(struct gendisk hd, int partno, char *buf);
	369	#define ADDPART_FLAG_NONE 0
	370	#define ADDPART_FLAG_RAID 1
	371	#define ADDPART_FLAG_WHOLEDISK 2
cddae808	372	void delete_partition(struct gendisk disk, struct hd_struct part);
fa9156ae CH	373	int bdev_add_partition(struct block_device *bdev, int partno,
	374	sector_t start, sector_t length);
	375	int bdev_del_partition(struct block_device *bdev, int partno);
	376	int bdev_resize_partition(struct block_device *bdev, int partno,
	377	sector_t start, sector_t length);
581e2600	378	int disk_expand_part_tbl(struct gendisk *disk, int target);
8da2892e	379	int hd_ref_init(struct hd_struct *part);
581e2600 CH	380
	381	static inline void hd_struct_get(struct hd_struct *part)
	382	{
	383	percpu_ref_get(&part->ref);
	384	}
	385
	386	static inline int hd_struct_try_get(struct hd_struct *part)
	387	{
	388	return percpu_ref_tryget_live(&part->ref);
	389	}
	390
	391	static inline void hd_struct_put(struct hd_struct *part)
	392	{
	393	percpu_ref_put(&part->ref);
	394	}
	395
581e2600 CH	396	static inline void hd_free_part(struct hd_struct *part)
	397	{
	398	free_part_stats(part);
	399	kfree(part->info);
	400	percpu_ref_exit(&part->ref);
	401	}
	402
	403	/*
	404	* Any access of part->nr_sects which is not protected by partition
	405	* bd_mutex or gendisk bdev bd_mutex, should be done using this
	406	* accessor function.
	407	*
	408	* Code written along the lines of i_size_read() and i_size_write().
	409	* CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
	410	* on.
	411	*/
	412	static inline sector_t part_nr_sects_read(struct hd_struct *part)
	413	{
	414	#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	415	sector_t nr_sects;
	416	unsigned seq;
	417	do {
	418	seq = read_seqcount_begin(&part->nr_sects_seq);
	419	nr_sects = part->nr_sects;
	420	} while (read_seqcount_retry(&part->nr_sects_seq, seq));
	421	return nr_sects;
	422	#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
	423	sector_t nr_sects;
	424
	425	preempt_disable();
	426	nr_sects = part->nr_sects;
	427	preempt_enable();
	428	return nr_sects;
	429	#else
	430	return part->nr_sects;
	431	#endif
	432	}
	433
	434	/*
	435	* Should be called with mutex lock held (typically bd_mutex) of partition
	436	* to provide mutual exlusion among writers otherwise seqcount might be
	437	* left in wrong state leaving the readers spinning infinitely.
	438	*/
	439	static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
	440	{
	441	#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	442	write_seqcount_begin(&part->nr_sects_seq);
	443	part->nr_sects = size;
	444	write_seqcount_end(&part->nr_sects_seq);
	445	#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
	446	preempt_disable();
	447	part->nr_sects = size;
	448	preempt_enable();
	449	#else
	450	part->nr_sects = size;
	451	#endif
	452	}
	453
3d745ea5 CH	454	struct request_queue *__blk_alloc_queue(int node_id);
3d745ea5 CH	455
130879f1 CH	456	int __bio_add_pc_page(struct request_queue q, struct bio bio,
	457	struct page *page, unsigned int len, unsigned int offset,
	458	bool *same_page);
	459
bc9fcbf9	460	#endif /* BLK_INTERNAL_H */