[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"

/* 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);
}

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);

#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);
}

void blk_integrity_add(struct gendisk *);
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 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 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);

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);
}

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);
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;
}

/*
 * 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);
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 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_devt(struct block_device *part, dev_t *devt);
void blk_free_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
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 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);

#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
8d699663 YY	47	static inline bool
	48	is_flush_rq(struct request req, struct blk_mq_hw_ctx hctx)
	49	{
	50	return hctx->fq->flush_rq == req;
	51	}
	52
754a1572 GJ	53	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	54	gfp_t flags);
f70ced09	55	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	56
3ef28e83 DW	57	void blk_freeze_queue(struct request_queue *q);
3ef28e83 DW	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
5a48fc14 DW	99	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	100	void blk_flush_integrity(void);
7c20f116	101	bool __bio_integrity_endio(struct bio *);
ece841ab	102	void bio_integrity_free(struct bio *bio);
7c20f116 CH	103	static inline bool bio_integrity_endio(struct bio *bio)
	104	{
	105	if (bio_integrity(bio))
	106	return __bio_integrity_endio(bio);
	107	return true;
	108	}
43b729bf	109
92cf2fd1 CH	110	bool blk_integrity_merge_rq(struct request_queue , struct request ,
92cf2fd1 CH	111	struct request *);
d59da419 CH	112	bool blk_integrity_merge_bio(struct request_queue , struct request ,
d59da419 CH	113	struct bio *);
92cf2fd1	114
43b729bf CH	115	static inline bool integrity_req_gap_back_merge(struct request *req,
	116	struct bio *next)
	117	{
	118	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	119	struct bio_integrity_payload *bip_next = bio_integrity(next);
	120
	121	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	122	bip_next->bip_vec[0].bv_offset);
	123	}
	124
	125	static inline bool integrity_req_gap_front_merge(struct request *req,
	126	struct bio *bio)
	127	{
	128	struct bio_integrity_payload *bip = bio_integrity(bio);
	129	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	130
	131	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	132	bip_next->bip_vec[0].bv_offset);
	133	}
581e2600 CH	134
	135	void blk_integrity_add(struct gendisk *);
	136	void blk_integrity_del(struct gendisk *);
43b729bf	137	#else /* CONFIG_BLK_DEV_INTEGRITY */
92cf2fd1 CH	138	static inline bool blk_integrity_merge_rq(struct request_queue *rq,
	139	struct request r1, struct request r2)
	140	{
	141	return true;
	142	}
d59da419 CH	143	static inline bool blk_integrity_merge_bio(struct request_queue *rq,
	144	struct request r, struct bio b)
	145	{
	146	return true;
	147	}
43b729bf CH	148	static inline bool integrity_req_gap_back_merge(struct request *req,
	149	struct bio *next)
	150	{
	151	return false;
	152	}
	153	static inline bool integrity_req_gap_front_merge(struct request *req,
	154	struct bio *bio)
	155	{
	156	return false;
	157	}
	158
5a48fc14 DW	159	static inline void blk_flush_integrity(void)
	160	{
	161	}
7c20f116 CH	162	static inline bool bio_integrity_endio(struct bio *bio)
	163	{
	164	return true;
	165	}
ece841ab JT	166	static inline void bio_integrity_free(struct bio *bio)
	167	{
	168	}
581e2600 CH	169	static inline void blk_integrity_add(struct gendisk *disk)
	170	{
	171	}
	172	static inline void blk_integrity_del(struct gendisk *disk)
	173	{
	174	}
43b729bf	175	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	176
0d2602ca	177	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	178	void blk_add_timer(struct request *req);
320ae51f	179
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);
bdc6a287 BW	182	bool blk_bio_list_merge(struct request_queue q, struct list_head list,
bdc6a287 BW	183	struct bio *bio, unsigned int nr_segs);
320ae51f	184
b5af37ab	185	void blk_account_io_start(struct request *req);
522a7775	186	void blk_account_io_done(struct request *req, u64 now);
320ae51f	187
158dbda0 TH	188	/*
	189	* Internal elevator interface
	190	*/
e8064021	191	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	192
ae1b1539	193	void blk_insert_flush(struct request *rq);
dd831006	194
954b4a5c	195	void elevator_init_mq(struct request_queue *q);
d48ece20 JW	196	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	197	struct elevator_type *new_e);
c3e22192	198	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	199	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	200	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	201
c3e22192 ML	202	static inline void elevator_exit(struct request_queue *q,
	203	struct elevator_queue *e)
	204	{
284b94be ML	205	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	206
c3e22192 ML	207	blk_mq_sched_free_requests(q);
	208	__elevator_exit(q, e);
	209	}
	210
3ad5cee5 CH	211	ssize_t part_size_show(struct device dev, struct device_attribute attr,
	212	char *buf);
	213	ssize_t part_stat_show(struct device dev, struct device_attribute attr,
	214	char *buf);
	215	ssize_t part_inflight_show(struct device dev, struct device_attribute attr,
	216	char *buf);
	217	ssize_t part_fail_show(struct device dev, struct device_attribute attr,
	218	char *buf);
	219	ssize_t part_fail_store(struct device dev, struct device_attribute attr,
	220	const char *buf, size_t count);
581d4e28 JA	221	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	222	ssize_t part_timeout_store(struct device , struct device_attribute ,
	223	const char *, size_t);
581d4e28	224
f695ca38	225	void __blk_queue_split(struct bio *bio, unsigned int nr_segs);
14ccb66b CH	226	int ll_back_merge_fn(struct request req, struct bio bio,
14ccb66b CH	227	unsigned int nr_segs);
5e84ea3a JA	228	int blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a JA	229	struct request *next);
e9cd19c0	230	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	231	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	232	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	233	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	234
ff88972c AB	235	int blk_dev_init(void);
ff88972c AB	236
c2553b58 JA	237	/*
	238	* Contribute to IO statistics IFF:
	239	*
	240	* a) it's attached to a gendisk, and
48d9b0d4	241	* b) the queue had IO stats enabled when this request was started
c2553b58	242	*/
599d067d	243	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	244	{
48d9b0d4	245	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
fb8ec18c JA	246	}
fb8ec18c JA	247
6cf7677f CH	248	static inline void req_set_nomerge(struct request_queue q, struct request req)
	249	{
	250	req->cmd_flags \|= REQ_NOMERGE;
	251	if (req == q->last_merge)
	252	q->last_merge = NULL;
	253	}
	254
1adfc5e4 ML	255	/*
	256	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	257	* is defined as 'unsigned int', meantime it has to aligned to with logical
	258	* block size which is the minimum accepted unit by hardware.
	259	*/
	260	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	261	{
	262	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	263	}
	264
9b15d109 CL	265	/*
	266	* The max bio size which is aligned to q->limits.discard_granularity. This
	267	* is a hint to split large discard bio in generic block layer, then if device
	268	* driver needs to split the discard bio into smaller ones, their bi_size can
	269	* be very probably and easily aligned to discard_granularity of the device's
	270	* queue.
	271	*/
	272	static inline unsigned int bio_aligned_discard_max_sectors(
	273	struct request_queue *q)
	274	{
	275	return round_down(UINT_MAX, q->limits.discard_granularity) >>
	276	SECTOR_SHIFT;
	277	}
	278
f2dbd76a TH	279	/*
	280	* Internal io_context interface
	281	*/
	282	void get_io_context(struct io_context *ioc);
47fdd4ca	283	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	284	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	285	gfp_t gfp_mask);
7e5a8794	286	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	287
24acfc34	288	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a	289
f2dbd76a TH	290	/*
	291	* Internal throttling interface
	292	*/
bc9fcbf9	293	#ifdef CONFIG_BLK_DEV_THROTTLING
bc9fcbf9 TH	294	extern int blk_throtl_init(struct request_queue *q);
bc9fcbf9 TH	295	extern void blk_throtl_exit(struct request_queue *q);
d61fcfa4	296	extern void blk_throtl_register_queue(struct request_queue *q);
db18a53e	297	bool blk_throtl_bio(struct bio *bio);
bc9fcbf9	298	#else /* CONFIG_BLK_DEV_THROTTLING */
bc9fcbf9 TH	299	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	300	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	301	static inline void blk_throtl_register_queue(struct request_queue *q) { }
db18a53e	302	static inline bool blk_throtl_bio(struct bio *bio) { return false; }
bc9fcbf9	303	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	304	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	305	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	306	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	307	const char *page, size_t count);
9e234eea	308	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	309	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	310	#else
9e234eea SL	311	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	312	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	313	#endif
bc9fcbf9	314
9bb33f24 CH	315	void __blk_queue_bounce(struct request_queue q, struct bio *bio);
	316
	317	static inline bool blk_queue_may_bounce(struct request_queue *q)
	318	{
	319	return IS_ENABLED(CONFIG_BOUNCE) &&
	320	q->limits.bounce == BLK_BOUNCE_HIGH &&
	321	max_low_pfn >= max_pfn;
	322	}
	323
3bce016a CH	324	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
3bce016a CH	325	{
9bb33f24 CH	326	if (unlikely(blk_queue_may_bounce(q) && bio_has_data(*bio)))
9bb33f24 CH	327	__blk_queue_bounce(q, bio);
3bce016a	328	}
3bce016a	329
d7067512 JB	330	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	331	extern int blk_iolatency_init(struct request_queue *q);
	332	#else
	333	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	334	#endif
	335
a2d6b3a2 DLM	336	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	337
bf505456 DLM	338	#ifdef CONFIG_BLK_DEV_ZONED
bf505456 DLM	339	void blk_queue_free_zone_bitmaps(struct request_queue *q);
508aebb8	340	void blk_queue_clear_zone_settings(struct request_queue *q);
bf505456 DLM	341	#else
bf505456 DLM	342	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
508aebb8	343	static inline void blk_queue_clear_zone_settings(struct request_queue *q) {}
bf505456 DLM	344	#endif
bf505456 DLM	345
9fc995a6	346	int blk_alloc_devt(struct block_device part, dev_t devt);
581e2600	347	void blk_free_devt(dev_t devt);
581e2600 CH	348	char disk_name(struct gendisk hd, int partno, char *buf);
	349	#define ADDPART_FLAG_NONE 0
	350	#define ADDPART_FLAG_RAID 1
	351	#define ADDPART_FLAG_WHOLEDISK 2
fa9156ae CH	352	int bdev_add_partition(struct block_device *bdev, int partno,
	353	sector_t start, sector_t length);
	354	int bdev_del_partition(struct block_device *bdev, int partno);
	355	int bdev_resize_partition(struct block_device *bdev, int partno,
	356	sector_t start, sector_t length);
581e2600	357
e4581105	358	int bio_add_hw_page(struct request_queue q, struct bio bio,
130879f1	359	struct page *page, unsigned int len, unsigned int offset,
e4581105	360	unsigned int max_sectors, bool *same_page);
130879f1	361
bc9fcbf9	362	#endif /* BLK_INTERNAL_H */