[linux-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 <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"

struct elevator_type;

/* 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);
void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
void blk_queue_start_drain(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);
}

static inline bool rq_mergeable(struct request *rq)
{
	if (blk_rq_is_passthrough(rq))
		return false;

	if (req_op(rq) == REQ_OP_FLUSH)
		return false;

	if (req_op(rq) == REQ_OP_WRITE_ZEROES)
		return false;

	if (req_op(rq) == REQ_OP_ZONE_APPEND)
		return false;

	if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
		return false;
	if (rq->rq_flags & RQF_NOMERGE_FLAGS)
		return false;

	return true;
}

/*
 * There are two different ways to handle DISCARD merges:
 *  1) If max_discard_segments > 1, the driver treats every bio as a range and
 *     send the bios to controller together. The ranges don't need to be
 *     contiguous.
 *  2) Otherwise, the request will be normal read/write requests.  The ranges
 *     need to be contiguous.
 */
static inline bool blk_discard_mergable(struct request *req)
{
	if (req_op(req) == REQ_OP_DISCARD &&
	    queue_max_discard_segments(req->q) > 1)
		return true;
	return false;
}

#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);

/*
 * Plug flush limits
 */
#define BLK_MAX_REQUEST_COUNT	32
#define BLK_PLUG_FLUSH_SIZE	(128 * 1024)

/*
 * 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_rqs(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);

#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
2e9bc346 CH	15	struct elevator_type;
2e9bc346 CH	16
0d2602ca JA	17	/* Max future timer expiry for timeouts */
	18	#define BLK_MAX_TIMEOUT (5 * HZ)
	19
18fbda91	20	extern struct dentry *blk_debugfs_root;
18fbda91	21
7c94e1c1	22	struct blk_flush_queue {
7c94e1c1 ML	23	unsigned int flush_pending_idx:1;
7c94e1c1 ML	24	unsigned int flush_running_idx:1;
8d699663	25	blk_status_t rq_status;
7c94e1c1 ML	26	unsigned long flush_pending_since;
	27	struct list_head flush_queue[2];
	28	struct list_head flush_data_in_flight;
	29	struct request *flush_rq;
0048b483	30
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
a9ed27a7	49	bool is_flush_rq(struct request *req);
8d699663	50
754a1572 GJ	51	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	52	gfp_t flags);
f70ced09	53	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	54
3ef28e83	55	void blk_freeze_queue(struct request_queue *q);
aec89dc5	56	void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
8e141f9e	57	void blk_queue_start_drain(struct request_queue *q);
3ef28e83	58
dc0b8a57	59	#define BIO_INLINE_VECS 4
7a800a20 CH	60	struct bio_vec bvec_alloc(mempool_t pool, unsigned short *nr_vecs,
	61	gfp_t gfp_mask);
	62	void bvec_free(mempool_t pool, struct bio_vec bv, unsigned short nr_vecs);
eec716a1	63
3dccdae5 CH	64	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	65	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	66	{
3dccdae5	67	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	68	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	69	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	70
3dccdae5 CH	71	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	72	return false;
0383ad43	73	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	74	return false;
3dccdae5 CH	75	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	76	return false;
6a9f5f24 CH	77	return true;
	78	}
	79
27ca1d4e CH	80	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	81	struct bio_vec *bprv, unsigned int offset)
	82	{
df376b2e	83	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	84	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	85	}
	86
	87	/*
	88	* Check if adding a bio_vec after bprv with offset would create a gap in
	89	* the SG list. Most drivers don't care about this, but some do.
	90	*/
	91	static inline bool bvec_gap_to_prev(struct request_queue *q,
	92	struct bio_vec *bprv, unsigned int offset)
	93	{
	94	if (!queue_virt_boundary(q))
	95	return false;
	96	return __bvec_gap_to_prev(q, bprv, offset);
	97	}
	98
badf7f64 CH	99	static inline bool rq_mergeable(struct request *rq)
	100	{
	101	if (blk_rq_is_passthrough(rq))
	102	return false;
	103
	104	if (req_op(rq) == REQ_OP_FLUSH)
	105	return false;
	106
	107	if (req_op(rq) == REQ_OP_WRITE_ZEROES)
	108	return false;
	109
	110	if (req_op(rq) == REQ_OP_ZONE_APPEND)
	111	return false;
	112
	113	if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
	114	return false;
	115	if (rq->rq_flags & RQF_NOMERGE_FLAGS)
	116	return false;
	117
	118	return true;
	119	}
	120
	121	/*
	122	* There are two different ways to handle DISCARD merges:
	123	* 1) If max_discard_segments > 1, the driver treats every bio as a range and
	124	* send the bios to controller together. The ranges don't need to be
	125	* contiguous.
	126	* 2) Otherwise, the request will be normal read/write requests. The ranges
	127	* need to be contiguous.
	128	*/
	129	static inline bool blk_discard_mergable(struct request *req)
	130	{
	131	if (req_op(req) == REQ_OP_DISCARD &&
	132	queue_max_discard_segments(req->q) > 1)
	133	return true;
	134	return false;
	135	}
	136
5a48fc14 DW	137	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	138	void blk_flush_integrity(void);
7c20f116	139	bool __bio_integrity_endio(struct bio *);
ece841ab	140	void bio_integrity_free(struct bio *bio);
7c20f116 CH	141	static inline bool bio_integrity_endio(struct bio *bio)
	142	{
	143	if (bio_integrity(bio))
	144	return __bio_integrity_endio(bio);
	145	return true;
	146	}
43b729bf	147
92cf2fd1 CH	148	bool blk_integrity_merge_rq(struct request_queue , struct request ,
92cf2fd1 CH	149	struct request *);
d59da419 CH	150	bool blk_integrity_merge_bio(struct request_queue , struct request ,
d59da419 CH	151	struct bio *);
92cf2fd1	152
43b729bf CH	153	static inline bool integrity_req_gap_back_merge(struct request *req,
	154	struct bio *next)
	155	{
	156	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	157	struct bio_integrity_payload *bip_next = bio_integrity(next);
	158
	159	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	160	bip_next->bip_vec[0].bv_offset);
	161	}
	162
	163	static inline bool integrity_req_gap_front_merge(struct request *req,
	164	struct bio *bio)
	165	{
	166	struct bio_integrity_payload *bip = bio_integrity(bio);
	167	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	168
	169	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	170	bip_next->bip_vec[0].bv_offset);
	171	}
581e2600	172
614310c9	173	int blk_integrity_add(struct gendisk *disk);
581e2600	174	void blk_integrity_del(struct gendisk *);
43b729bf	175	#else /* CONFIG_BLK_DEV_INTEGRITY */
92cf2fd1 CH	176	static inline bool blk_integrity_merge_rq(struct request_queue *rq,
	177	struct request r1, struct request r2)
	178	{
	179	return true;
	180	}
d59da419 CH	181	static inline bool blk_integrity_merge_bio(struct request_queue *rq,
	182	struct request r, struct bio b)
	183	{
	184	return true;
	185	}
43b729bf CH	186	static inline bool integrity_req_gap_back_merge(struct request *req,
	187	struct bio *next)
	188	{
	189	return false;
	190	}
	191	static inline bool integrity_req_gap_front_merge(struct request *req,
	192	struct bio *bio)
	193	{
	194	return false;
	195	}
	196
5a48fc14 DW	197	static inline void blk_flush_integrity(void)
	198	{
	199	}
7c20f116 CH	200	static inline bool bio_integrity_endio(struct bio *bio)
	201	{
	202	return true;
	203	}
ece841ab JT	204	static inline void bio_integrity_free(struct bio *bio)
	205	{
	206	}
614310c9	207	static inline int blk_integrity_add(struct gendisk *disk)
581e2600	208	{
614310c9	209	return 0;
581e2600 CH	210	}
	211	static inline void blk_integrity_del(struct gendisk *disk)
	212	{
	213	}
43b729bf	214	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	215
0d2602ca	216	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	217	void blk_add_timer(struct request *req);
320ae51f	218
320ae51f	219	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
14ccb66b	220	unsigned int nr_segs, struct request **same_queue_rq);
bdc6a287 BW	221	bool blk_bio_list_merge(struct request_queue q, struct list_head list,
bdc6a287 BW	222	struct bio *bio, unsigned int nr_segs);
320ae51f	223
b5af37ab	224	void blk_account_io_start(struct request *req);
522a7775	225	void blk_account_io_done(struct request *req, u64 now);
320ae51f	226
ba0ffdd8 JA	227	/*
	228	* Plug flush limits
	229	*/
	230	#define BLK_MAX_REQUEST_COUNT 32
	231	#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
	232
158dbda0 TH	233	/*
	234	* Internal elevator interface
	235	*/
e8064021	236	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	237
ae1b1539	238	void blk_insert_flush(struct request *rq);
dd831006	239
d48ece20 JW	240	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	241	struct elevator_type *new_e);
c3e22192	242	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	243	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	244	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	245
c3e22192 ML	246	static inline void elevator_exit(struct request_queue *q,
	247	struct elevator_queue *e)
	248	{
284b94be ML	249	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	250
1820f4f0	251	blk_mq_sched_free_rqs(q);
c3e22192 ML	252	__elevator_exit(q, e);
	253	}
	254
3ad5cee5 CH	255	ssize_t part_size_show(struct device dev, struct device_attribute attr,
	256	char *buf);
	257	ssize_t part_stat_show(struct device dev, struct device_attribute attr,
	258	char *buf);
	259	ssize_t part_inflight_show(struct device dev, struct device_attribute attr,
	260	char *buf);
	261	ssize_t part_fail_show(struct device dev, struct device_attribute attr,
	262	char *buf);
	263	ssize_t part_fail_store(struct device dev, struct device_attribute attr,
	264	const char *buf, size_t count);
581d4e28 JA	265	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	266	ssize_t part_timeout_store(struct device , struct device_attribute ,
	267	const char *, size_t);
581d4e28	268
f695ca38	269	void __blk_queue_split(struct bio *bio, unsigned int nr_segs);
14ccb66b CH	270	int ll_back_merge_fn(struct request req, struct bio bio,
14ccb66b CH	271	unsigned int nr_segs);
fd2ef39c	272	bool blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a	273	struct request *next);
e9cd19c0	274	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	275	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	276	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	277	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	278
ff88972c AB	279	int blk_dev_init(void);
ff88972c AB	280
c2553b58 JA	281	/*
	282	* Contribute to IO statistics IFF:
	283	*
	284	* a) it's attached to a gendisk, and
48d9b0d4	285	* b) the queue had IO stats enabled when this request was started
c2553b58	286	*/
599d067d	287	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	288	{
48d9b0d4	289	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
fb8ec18c JA	290	}
fb8ec18c JA	291
6cf7677f CH	292	static inline void req_set_nomerge(struct request_queue q, struct request req)
	293	{
	294	req->cmd_flags \|= REQ_NOMERGE;
	295	if (req == q->last_merge)
	296	q->last_merge = NULL;
	297	}
	298
1adfc5e4 ML	299	/*
	300	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	301	* is defined as 'unsigned int', meantime it has to aligned to with logical
	302	* block size which is the minimum accepted unit by hardware.
	303	*/
	304	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	305	{
	306	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	307	}
	308
9b15d109 CL	309	/*
	310	* The max bio size which is aligned to q->limits.discard_granularity. This
	311	* is a hint to split large discard bio in generic block layer, then if device
	312	* driver needs to split the discard bio into smaller ones, their bi_size can
	313	* be very probably and easily aligned to discard_granularity of the device's
	314	* queue.
	315	*/
	316	static inline unsigned int bio_aligned_discard_max_sectors(
	317	struct request_queue *q)
	318	{
	319	return round_down(UINT_MAX, q->limits.discard_granularity) >>
	320	SECTOR_SHIFT;
	321	}
	322
f2dbd76a TH	323	/*
	324	* Internal io_context interface
	325	*/
	326	void get_io_context(struct io_context *ioc);
47fdd4ca	327	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	328	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	329	gfp_t gfp_mask);
7e5a8794	330	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	331
24acfc34	332	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a	333
297e3d85 SL	334	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	335	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	336	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	337	const char *page, size_t count);
9e234eea	338	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	339	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	340	#else
9e234eea SL	341	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	342	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	343	#endif
bc9fcbf9	344
9bb33f24 CH	345	void __blk_queue_bounce(struct request_queue q, struct bio *bio);
	346
	347	static inline bool blk_queue_may_bounce(struct request_queue *q)
	348	{
	349	return IS_ENABLED(CONFIG_BOUNCE) &&
	350	q->limits.bounce == BLK_BOUNCE_HIGH &&
	351	max_low_pfn >= max_pfn;
	352	}
	353
3bce016a CH	354	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
3bce016a CH	355	{
9bb33f24 CH	356	if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio)))
9bb33f24 CH	357	__blk_queue_bounce(q, bio);
3bce016a	358	}
3bce016a	359
d7067512 JB	360	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	361	extern int blk_iolatency_init(struct request_queue *q);
	362	#else
	363	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	364	#endif
	365
a2d6b3a2 DLM	366	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	367
bf505456 DLM	368	#ifdef CONFIG_BLK_DEV_ZONED
bf505456 DLM	369	void blk_queue_free_zone_bitmaps(struct request_queue *q);
508aebb8	370	void blk_queue_clear_zone_settings(struct request_queue *q);
bf505456 DLM	371	#else
bf505456 DLM	372	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
508aebb8	373	static inline void blk_queue_clear_zone_settings(struct request_queue *q) {}
bf505456 DLM	374	#endif
bf505456 DLM	375
7c3f828b CH	376	int blk_alloc_ext_minor(void);
7c3f828b CH	377	void blk_free_ext_minor(unsigned int minor);
581e2600 CH	378	#define ADDPART_FLAG_NONE 0
	379	#define ADDPART_FLAG_RAID 1
	380	#define ADDPART_FLAG_WHOLEDISK 2
7f6be376 CH	381	int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
7f6be376 CH	382	sector_t length);
926fbb16	383	int bdev_del_partition(struct gendisk *disk, int partno);
3d2e7989 CH	384	int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
3d2e7989 CH	385	sector_t length);
581e2600	386
e4581105	387	int bio_add_hw_page(struct request_queue q, struct bio bio,
130879f1	388	struct page *page, unsigned int len, unsigned int offset,
e4581105	389	unsigned int max_sectors, bool *same_page);
130879f1	390
da7ba729 CH	391	struct request_queue *blk_alloc_queue(int node_id);
da7ba729 CH	392
92e7755e	393	int disk_alloc_events(struct gendisk *disk);
d5870edf CH	394	void disk_add_events(struct gendisk *disk);
	395	void disk_del_events(struct gendisk *disk);
	396	void disk_release_events(struct gendisk *disk);
2bc8cda5 CH	397	extern struct device_attribute dev_attr_events;
	398	extern struct device_attribute dev_attr_events_async;
	399	extern struct device_attribute dev_attr_events_poll_msecs;
d5870edf	400
270a1c91 JA	401	static inline void bio_clear_hipri(struct bio *bio)
	402	{
	403	/* can't support alloc cache if we turn off polling */
	404	bio_clear_flag(bio, BIO_PERCPU_CACHE);
	405	bio->bi_opf &= ~REQ_HIPRI;
	406	}
	407
cd82cca7 CH	408	extern const struct address_space_operations def_blk_aops;
cd82cca7 CH	409
bc9fcbf9	410	#endif /* BLK_INTERNAL_H */