[mirror_ubuntu-jammy-kernel.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 <linux/blk-crypto.h>
#include <linux/memblock.h>	/* for max_pfn/max_low_pfn */
#include <xen/xen.h>
#include "blk-crypto-internal.h"
#include "blk-mq.h"
#include "blk-mq-sched.h"

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

extern struct dentry *blk_debugfs_root;

struct blk_flush_queue {
	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;

	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);
}

bool is_flush_rq(struct request *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);

#define BIO_INLINE_VECS 4
struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs,
		gfp_t gfp_mask);
void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs);

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);
}

#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;
}

bool blk_integrity_merge_rq(struct request_queue *, struct request *,
		struct request *);
bool blk_integrity_merge_bio(struct request_queue *, struct request *,
		struct bio *);

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);
}

int blk_integrity_add(struct gendisk *disk);
void blk_integrity_del(struct gendisk *);
#else /* CONFIG_BLK_DEV_INTEGRITY */
static inline bool blk_integrity_merge_rq(struct request_queue *rq,
		struct request *r1, struct request *r2)
{
	return true;
}
static inline bool blk_integrity_merge_bio(struct request_queue *rq,
		struct request *r, struct bio *b)
{
	return true;
}
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 int blk_integrity_add(struct gendisk *disk)
{
	return 0;
}
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 blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
		unsigned int nr_segs, struct request **same_queue_rq);
bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
			struct bio *bio, unsigned int nr_segs);

void blk_account_io_start(struct request *req);
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_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);
}

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);
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);

void __blk_queue_split(struct bio **bio, unsigned int *nr_segs);
int ll_back_merge_fn(struct request *req, struct bio *bio,
		unsigned int nr_segs);
bool 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;
}

/*
 * The max bio size which is aligned to q->limits.discard_granularity. This
 * is a hint to split large discard bio in generic block layer, then if device
 * driver needs to split the discard bio into smaller ones, their bi_size can
 * be very probably and easily aligned to discard_granularity of the device's
 * queue.
 */
static inline unsigned int bio_aligned_discard_max_sectors(
					struct request_queue *q)
{
	return round_down(UINT_MAX, q->limits.discard_granularity) >>
			SECTOR_SHIFT;
}

/*
 * 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 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);
extern void blk_throtl_charge_bio_split(struct bio *bio);
bool blk_throtl_bio(struct bio *bio);
#else /* CONFIG_BLK_DEV_THROTTLING */
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) { }
static inline void blk_throtl_charge_bio_split(struct bio *bio) { }
static inline bool blk_throtl_bio(struct bio *bio) { return false; }
#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

void __blk_queue_bounce(struct request_queue *q, struct bio **bio);

static inline bool blk_queue_may_bounce(struct request_queue *q)
{
	return IS_ENABLED(CONFIG_BOUNCE) &&
		q->limits.bounce == BLK_BOUNCE_HIGH &&
		max_low_pfn >= max_pfn;
}

static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
{
	if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio)))
		__blk_queue_bounce(q, bio);	
}

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

int blk_alloc_ext_minor(void);
void blk_free_ext_minor(unsigned int minor);
#define ADDPART_FLAG_NONE	0
#define ADDPART_FLAG_RAID	1
#define ADDPART_FLAG_WHOLEDISK	2
int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
		sector_t length);
int bdev_del_partition(struct gendisk *disk, int partno);
int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
		sector_t length);

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

struct request_queue *blk_alloc_queue(int node_id);

int disk_alloc_events(struct gendisk *disk);
void disk_add_events(struct gendisk *disk);
void disk_del_events(struct gendisk *disk);
void disk_release_events(struct gendisk *disk);
extern struct device_attribute dev_attr_events;
extern struct device_attribute dev_attr_events_async;
extern struct device_attribute dev_attr_events_poll_msecs;

static inline void bio_clear_hipri(struct bio *bio)
{
	/* can't support alloc cache if we turn off polling */
	bio_clear_flag(bio, BIO_PERCPU_CACHE);
	bio->bi_opf &= ~REQ_HIPRI;
}

extern const struct address_space_operations def_blk_aops;

#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>
a892c8d5	8	#include <linux/blk-crypto.h>
9bb33f24	9	#include <linux/memblock.h> /* for max_pfn/max_low_pfn */
c39ae60d	10	#include <xen/xen.h>
a892c8d5	11	#include "blk-crypto-internal.h"
f70ced09	12	#include "blk-mq.h"
c3e22192	13	#include "blk-mq-sched.h"
a73f730d	14
0d2602ca JA	15	/* Max future timer expiry for timeouts */
	16	#define BLK_MAX_TIMEOUT (5 * HZ)
	17
18fbda91	18	extern struct dentry *blk_debugfs_root;
18fbda91	19
7c94e1c1	20	struct blk_flush_queue {
7c94e1c1 ML	21	unsigned int flush_pending_idx:1;
7c94e1c1 ML	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	28
7c94e1c1 ML	29	spinlock_t mq_flush_lock;
	30	};
	31
8324aa91 JA	32	extern struct kmem_cache *blk_requestq_cachep;
8324aa91 JA	33	extern struct kobj_type blk_queue_ktype;
a73f730d	34	extern struct ida blk_queue_ida;
8324aa91	35
f9afca4d JA	36	static inline struct blk_flush_queue *
f9afca4d JA	37	blk_get_flush_queue(struct request_queue q, struct blk_mq_ctx ctx)
7c94e1c1	38	{
8ccdf4a3	39	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
7c94e1c1 ML	40	}
7c94e1c1 ML	41
09ac46c4 TH	42	static inline void __blk_get_queue(struct request_queue *q)
	43	{
	44	kobject_get(&q->kobj);
	45	}
	46
a9ed27a7	47	bool is_flush_rq(struct request *req);
8d699663	48
754a1572 GJ	49	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	50	gfp_t flags);
f70ced09	51	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	52
3ef28e83 DW	53	void blk_freeze_queue(struct request_queue *q);
3ef28e83 DW	54
dc0b8a57	55	#define BIO_INLINE_VECS 4
7a800a20 CH	56	struct bio_vec bvec_alloc(mempool_t pool, unsigned short *nr_vecs,
	57	gfp_t gfp_mask);
	58	void bvec_free(mempool_t pool, struct bio_vec bv, unsigned short nr_vecs);
eec716a1	59
3dccdae5 CH	60	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	61	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	62	{
3dccdae5	63	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	64	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	65	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	66
3dccdae5 CH	67	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	68	return false;
0383ad43	69	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	70	return false;
3dccdae5 CH	71	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	72	return false;
6a9f5f24 CH	73	return true;
	74	}
	75
27ca1d4e CH	76	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	77	struct bio_vec *bprv, unsigned int offset)
	78	{
df376b2e	79	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	80	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	81	}
	82
	83	/*
	84	* Check if adding a bio_vec after bprv with offset would create a gap in
	85	* the SG list. Most drivers don't care about this, but some do.
	86	*/
	87	static inline bool bvec_gap_to_prev(struct request_queue *q,
	88	struct bio_vec *bprv, unsigned int offset)
	89	{
	90	if (!queue_virt_boundary(q))
	91	return false;
	92	return __bvec_gap_to_prev(q, bprv, offset);
	93	}
	94
5a48fc14 DW	95	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	96	void blk_flush_integrity(void);
7c20f116	97	bool __bio_integrity_endio(struct bio *);
ece841ab	98	void bio_integrity_free(struct bio *bio);
7c20f116 CH	99	static inline bool bio_integrity_endio(struct bio *bio)
	100	{
	101	if (bio_integrity(bio))
	102	return __bio_integrity_endio(bio);
	103	return true;
	104	}
43b729bf	105
92cf2fd1 CH	106	bool blk_integrity_merge_rq(struct request_queue , struct request ,
92cf2fd1 CH	107	struct request *);
d59da419 CH	108	bool blk_integrity_merge_bio(struct request_queue , struct request ,
d59da419 CH	109	struct bio *);
92cf2fd1	110
43b729bf CH	111	static inline bool integrity_req_gap_back_merge(struct request *req,
	112	struct bio *next)
	113	{
	114	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	115	struct bio_integrity_payload *bip_next = bio_integrity(next);
	116
	117	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	118	bip_next->bip_vec[0].bv_offset);
	119	}
	120
	121	static inline bool integrity_req_gap_front_merge(struct request *req,
	122	struct bio *bio)
	123	{
	124	struct bio_integrity_payload *bip = bio_integrity(bio);
	125	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	126
	127	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	128	bip_next->bip_vec[0].bv_offset);
	129	}
581e2600	130
614310c9	131	int blk_integrity_add(struct gendisk *disk);
581e2600	132	void blk_integrity_del(struct gendisk *);
43b729bf	133	#else /* CONFIG_BLK_DEV_INTEGRITY */
92cf2fd1 CH	134	static inline bool blk_integrity_merge_rq(struct request_queue *rq,
	135	struct request r1, struct request r2)
	136	{
	137	return true;
	138	}
d59da419 CH	139	static inline bool blk_integrity_merge_bio(struct request_queue *rq,
	140	struct request r, struct bio b)
	141	{
	142	return true;
	143	}
43b729bf CH	144	static inline bool integrity_req_gap_back_merge(struct request *req,
	145	struct bio *next)
	146	{
	147	return false;
	148	}
	149	static inline bool integrity_req_gap_front_merge(struct request *req,
	150	struct bio *bio)
	151	{
	152	return false;
	153	}
	154
5a48fc14 DW	155	static inline void blk_flush_integrity(void)
	156	{
	157	}
7c20f116 CH	158	static inline bool bio_integrity_endio(struct bio *bio)
	159	{
	160	return true;
	161	}
ece841ab JT	162	static inline void bio_integrity_free(struct bio *bio)
	163	{
	164	}
614310c9	165	static inline int blk_integrity_add(struct gendisk *disk)
581e2600	166	{
614310c9	167	return 0;
581e2600 CH	168	}
	169	static inline void blk_integrity_del(struct gendisk *disk)
	170	{
	171	}
43b729bf	172	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	173
0d2602ca	174	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	175	void blk_add_timer(struct request *req);
320ae51f	176
320ae51f	177	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
14ccb66b	178	unsigned int nr_segs, struct request **same_queue_rq);
bdc6a287 BW	179	bool blk_bio_list_merge(struct request_queue q, struct list_head list,
bdc6a287 BW	180	struct bio *bio, unsigned int nr_segs);
320ae51f	181
b5af37ab	182	void blk_account_io_start(struct request *req);
522a7775	183	void blk_account_io_done(struct request *req, u64 now);
320ae51f	184
158dbda0 TH	185	/*
	186	* Internal elevator interface
	187	*/
e8064021	188	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	189
ae1b1539	190	void blk_insert_flush(struct request *rq);
dd831006	191
d48ece20 JW	192	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	193	struct elevator_type *new_e);
c3e22192	194	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	195	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	196	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	197
c3e22192 ML	198	static inline void elevator_exit(struct request_queue *q,
	199	struct elevator_queue *e)
	200	{
284b94be ML	201	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	202
c3e22192 ML	203	blk_mq_sched_free_requests(q);
	204	__elevator_exit(q, e);
	205	}
	206
3ad5cee5 CH	207	ssize_t part_size_show(struct device dev, struct device_attribute attr,
	208	char *buf);
	209	ssize_t part_stat_show(struct device dev, struct device_attribute attr,
	210	char *buf);
	211	ssize_t part_inflight_show(struct device dev, struct device_attribute attr,
	212	char *buf);
	213	ssize_t part_fail_show(struct device dev, struct device_attribute attr,
	214	char *buf);
	215	ssize_t part_fail_store(struct device dev, struct device_attribute attr,
	216	const char *buf, size_t count);
581d4e28 JA	217	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	218	ssize_t part_timeout_store(struct device , struct device_attribute ,
	219	const char *, size_t);
581d4e28	220
f695ca38	221	void __blk_queue_split(struct bio *bio, unsigned int nr_segs);
14ccb66b CH	222	int ll_back_merge_fn(struct request req, struct bio bio,
14ccb66b CH	223	unsigned int nr_segs);
fd2ef39c	224	bool blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a	225	struct request *next);
e9cd19c0	226	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	227	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	228	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	229	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	230
ff88972c AB	231	int blk_dev_init(void);
ff88972c AB	232
c2553b58 JA	233	/*
	234	* Contribute to IO statistics IFF:
	235	*
	236	* a) it's attached to a gendisk, and
48d9b0d4	237	* b) the queue had IO stats enabled when this request was started
c2553b58	238	*/
599d067d	239	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	240	{
48d9b0d4	241	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
fb8ec18c JA	242	}
fb8ec18c JA	243
6cf7677f CH	244	static inline void req_set_nomerge(struct request_queue q, struct request req)
	245	{
	246	req->cmd_flags \|= REQ_NOMERGE;
	247	if (req == q->last_merge)
	248	q->last_merge = NULL;
	249	}
	250
1adfc5e4 ML	251	/*
	252	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	253	* is defined as 'unsigned int', meantime it has to aligned to with logical
	254	* block size which is the minimum accepted unit by hardware.
	255	*/
	256	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	257	{
	258	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	259	}
	260
9b15d109 CL	261	/*
	262	* The max bio size which is aligned to q->limits.discard_granularity. This
	263	* is a hint to split large discard bio in generic block layer, then if device
	264	* driver needs to split the discard bio into smaller ones, their bi_size can
	265	* be very probably and easily aligned to discard_granularity of the device's
	266	* queue.
	267	*/
	268	static inline unsigned int bio_aligned_discard_max_sectors(
	269	struct request_queue *q)
	270	{
	271	return round_down(UINT_MAX, q->limits.discard_granularity) >>
	272	SECTOR_SHIFT;
	273	}
	274
f2dbd76a TH	275	/*
	276	* Internal io_context interface
	277	*/
	278	void get_io_context(struct io_context *ioc);
47fdd4ca	279	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	280	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	281	gfp_t gfp_mask);
7e5a8794	282	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	283
24acfc34	284	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a	285
f2dbd76a TH	286	/*
	287	* Internal throttling interface
	288	*/
bc9fcbf9	289	#ifdef CONFIG_BLK_DEV_THROTTLING
bc9fcbf9 TH	290	extern int blk_throtl_init(struct request_queue *q);
bc9fcbf9 TH	291	extern void blk_throtl_exit(struct request_queue *q);
d61fcfa4	292	extern void blk_throtl_register_queue(struct request_queue *q);
4f1e9630	293	extern void blk_throtl_charge_bio_split(struct bio *bio);
db18a53e	294	bool blk_throtl_bio(struct bio *bio);
bc9fcbf9	295	#else /* CONFIG_BLK_DEV_THROTTLING */
bc9fcbf9 TH	296	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	297	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	298	static inline void blk_throtl_register_queue(struct request_queue *q) { }
4f1e9630	299	static inline void blk_throtl_charge_bio_split(struct bio *bio) { }
db18a53e	300	static inline bool blk_throtl_bio(struct bio *bio) { return false; }
bc9fcbf9	301	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	302	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	303	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	304	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	305	const char *page, size_t count);
9e234eea	306	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	307	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	308	#else
9e234eea SL	309	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	310	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	311	#endif
bc9fcbf9	312
9bb33f24 CH	313	void __blk_queue_bounce(struct request_queue q, struct bio *bio);
	314
	315	static inline bool blk_queue_may_bounce(struct request_queue *q)
	316	{
	317	return IS_ENABLED(CONFIG_BOUNCE) &&
	318	q->limits.bounce == BLK_BOUNCE_HIGH &&
	319	max_low_pfn >= max_pfn;
	320	}
	321
3bce016a CH	322	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
3bce016a CH	323	{
9bb33f24 CH	324	if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio)))
9bb33f24 CH	325	__blk_queue_bounce(q, bio);
3bce016a	326	}
3bce016a	327
d7067512 JB	328	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	329	extern int blk_iolatency_init(struct request_queue *q);
	330	#else
	331	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	332	#endif
	333
a2d6b3a2 DLM	334	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	335
bf505456 DLM	336	#ifdef CONFIG_BLK_DEV_ZONED
bf505456 DLM	337	void blk_queue_free_zone_bitmaps(struct request_queue *q);
508aebb8	338	void blk_queue_clear_zone_settings(struct request_queue *q);
bf505456 DLM	339	#else
bf505456 DLM	340	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
508aebb8	341	static inline void blk_queue_clear_zone_settings(struct request_queue *q) {}
bf505456 DLM	342	#endif
bf505456 DLM	343
7c3f828b CH	344	int blk_alloc_ext_minor(void);
7c3f828b CH	345	void blk_free_ext_minor(unsigned int minor);
581e2600 CH	346	#define ADDPART_FLAG_NONE 0
	347	#define ADDPART_FLAG_RAID 1
	348	#define ADDPART_FLAG_WHOLEDISK 2
7f6be376 CH	349	int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
7f6be376 CH	350	sector_t length);
926fbb16	351	int bdev_del_partition(struct gendisk *disk, int partno);
3d2e7989 CH	352	int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
3d2e7989 CH	353	sector_t length);
581e2600	354
e4581105	355	int bio_add_hw_page(struct request_queue q, struct bio bio,
130879f1	356	struct page *page, unsigned int len, unsigned int offset,
e4581105	357	unsigned int max_sectors, bool *same_page);
130879f1	358
da7ba729 CH	359	struct request_queue *blk_alloc_queue(int node_id);
da7ba729 CH	360
92e7755e	361	int disk_alloc_events(struct gendisk *disk);
d5870edf CH	362	void disk_add_events(struct gendisk *disk);
	363	void disk_del_events(struct gendisk *disk);
	364	void disk_release_events(struct gendisk *disk);
2bc8cda5 CH	365	extern struct device_attribute dev_attr_events;
	366	extern struct device_attribute dev_attr_events_async;
	367	extern struct device_attribute dev_attr_events_poll_msecs;
d5870edf	368
270a1c91 JA	369	static inline void bio_clear_hipri(struct bio *bio)
	370	{
	371	/* can't support alloc cache if we turn off polling */
	372	bio_clear_flag(bio, BIO_PERCPU_CACHE);
	373	bio->bi_opf &= ~REQ_HIPRI;
	374	}
	375
cd82cca7 CH	376	extern const struct address_space_operations def_blk_aops;
cd82cca7 CH	377
bc9fcbf9	378	#endif /* BLK_INTERNAL_H */