[mirror_ubuntu-hirsute-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 <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);

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);
}

struct block_device *__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);
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

#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

struct block_device *disk_map_sector_rcu(struct gendisk *disk, sector_t sector);

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
void delete_partition(struct block_device *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 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>
c39ae60d	9	#include <xen/xen.h>
a892c8d5	10	#include "blk-crypto-internal.h"
f70ced09	11	#include "blk-mq.h"
c3e22192	12	#include "blk-mq-sched.h"
a73f730d	13
0d2602ca JA	14	/* Max future timer expiry for timeouts */
	15	#define BLK_MAX_TIMEOUT (5 * HZ)
	16
18fbda91	17	extern struct dentry *blk_debugfs_root;
18fbda91	18
7c94e1c1	19	struct blk_flush_queue {
7c94e1c1 ML	20	unsigned int flush_pending_idx:1;
7c94e1c1 ML	21	unsigned int flush_running_idx:1;
8d699663	22	blk_status_t rq_status;
7c94e1c1 ML	23	unsigned long flush_pending_since;
	24	struct list_head flush_queue[2];
	25	struct list_head flush_data_in_flight;
	26	struct request *flush_rq;
0048b483	27
7c94e1c1 ML	28	spinlock_t mq_flush_lock;
	29	};
	30
8324aa91 JA	31	extern struct kmem_cache *blk_requestq_cachep;
8324aa91 JA	32	extern struct kobj_type blk_queue_ktype;
a73f730d	33	extern struct ida blk_queue_ida;
8324aa91	34
f9afca4d JA	35	static inline struct blk_flush_queue *
f9afca4d JA	36	blk_get_flush_queue(struct request_queue q, struct blk_mq_ctx ctx)
7c94e1c1	37	{
8ccdf4a3	38	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
7c94e1c1 ML	39	}
7c94e1c1 ML	40
09ac46c4 TH	41	static inline void __blk_get_queue(struct request_queue *q)
	42	{
	43	kobject_get(&q->kobj);
	44	}
	45
8d699663 YY	46	static inline bool
	47	is_flush_rq(struct request req, struct blk_mq_hw_ctx hctx)
	48	{
	49	return hctx->fq->flush_rq == req;
	50	}
	51
754a1572 GJ	52	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	53	gfp_t flags);
f70ced09	54	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	55
3ef28e83 DW	56	void blk_freeze_queue(struct request_queue *q);
3ef28e83 DW	57
3dccdae5 CH	58	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	59	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	60	{
3dccdae5	61	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	62	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	63	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	64
3dccdae5 CH	65	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	66	return false;
0383ad43	67	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	68	return false;
3dccdae5 CH	69	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	70	return false;
6a9f5f24 CH	71	return true;
	72	}
	73
27ca1d4e CH	74	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	75	struct bio_vec *bprv, unsigned int offset)
	76	{
df376b2e	77	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	78	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	79	}
	80
	81	/*
	82	* Check if adding a bio_vec after bprv with offset would create a gap in
	83	* the SG list. Most drivers don't care about this, but some do.
	84	*/
	85	static inline bool bvec_gap_to_prev(struct request_queue *q,
	86	struct bio_vec *bprv, unsigned int offset)
	87	{
	88	if (!queue_virt_boundary(q))
	89	return false;
	90	return __bvec_gap_to_prev(q, bprv, offset);
	91	}
	92
5a48fc14 DW	93	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	94	void blk_flush_integrity(void);
7c20f116	95	bool __bio_integrity_endio(struct bio *);
ece841ab	96	void bio_integrity_free(struct bio *bio);
7c20f116 CH	97	static inline bool bio_integrity_endio(struct bio *bio)
	98	{
	99	if (bio_integrity(bio))
	100	return __bio_integrity_endio(bio);
	101	return true;
	102	}
43b729bf	103
92cf2fd1 CH	104	bool blk_integrity_merge_rq(struct request_queue , struct request ,
92cf2fd1 CH	105	struct request *);
d59da419 CH	106	bool blk_integrity_merge_bio(struct request_queue , struct request ,
d59da419 CH	107	struct bio *);
92cf2fd1	108
43b729bf CH	109	static inline bool integrity_req_gap_back_merge(struct request *req,
	110	struct bio *next)
	111	{
	112	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	113	struct bio_integrity_payload *bip_next = bio_integrity(next);
	114
	115	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	116	bip_next->bip_vec[0].bv_offset);
	117	}
	118
	119	static inline bool integrity_req_gap_front_merge(struct request *req,
	120	struct bio *bio)
	121	{
	122	struct bio_integrity_payload *bip = bio_integrity(bio);
	123	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	124
	125	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	126	bip_next->bip_vec[0].bv_offset);
	127	}
581e2600 CH	128
	129	void blk_integrity_add(struct gendisk *);
	130	void blk_integrity_del(struct gendisk *);
43b729bf	131	#else /* CONFIG_BLK_DEV_INTEGRITY */
92cf2fd1 CH	132	static inline bool blk_integrity_merge_rq(struct request_queue *rq,
	133	struct request r1, struct request r2)
	134	{
	135	return true;
	136	}
d59da419 CH	137	static inline bool blk_integrity_merge_bio(struct request_queue *rq,
	138	struct request r, struct bio b)
	139	{
	140	return true;
	141	}
43b729bf CH	142	static inline bool integrity_req_gap_back_merge(struct request *req,
	143	struct bio *next)
	144	{
	145	return false;
	146	}
	147	static inline bool integrity_req_gap_front_merge(struct request *req,
	148	struct bio *bio)
	149	{
	150	return false;
	151	}
	152
5a48fc14 DW	153	static inline void blk_flush_integrity(void)
	154	{
	155	}
7c20f116 CH	156	static inline bool bio_integrity_endio(struct bio *bio)
	157	{
	158	return true;
	159	}
ece841ab JT	160	static inline void bio_integrity_free(struct bio *bio)
	161	{
	162	}
581e2600 CH	163	static inline void blk_integrity_add(struct gendisk *disk)
	164	{
	165	}
	166	static inline void blk_integrity_del(struct gendisk *disk)
	167	{
	168	}
43b729bf	169	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	170
0d2602ca	171	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	172	void blk_add_timer(struct request *req);
320ae51f	173
320ae51f	174	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
14ccb66b	175	unsigned int nr_segs, struct request **same_queue_rq);
bdc6a287 BW	176	bool blk_bio_list_merge(struct request_queue q, struct list_head list,
bdc6a287 BW	177	struct bio *bio, unsigned int nr_segs);
320ae51f	178
b5af37ab	179	void blk_account_io_start(struct request *req);
522a7775	180	void blk_account_io_done(struct request *req, u64 now);
320ae51f	181
158dbda0 TH	182	/*
	183	* Internal elevator interface
	184	*/
e8064021	185	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	186
ae1b1539	187	void blk_insert_flush(struct request *rq);
dd831006	188
954b4a5c	189	void elevator_init_mq(struct request_queue *q);
d48ece20 JW	190	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	191	struct elevator_type *new_e);
c3e22192	192	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	193	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	194	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	195
c3e22192 ML	196	static inline void elevator_exit(struct request_queue *q,
	197	struct elevator_queue *e)
	198	{
284b94be ML	199	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	200
c3e22192 ML	201	blk_mq_sched_free_requests(q);
	202	__elevator_exit(q, e);
	203	}
	204
8446fe92	205	struct block_device __disk_get_part(struct gendisk disk, int partno);
807d4af2	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);
5e84ea3a JA	224	int blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a JA	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);
db18a53e	293	bool blk_throtl_bio(struct bio *bio);
bc9fcbf9	294	#else /* CONFIG_BLK_DEV_THROTTLING */
bc9fcbf9 TH	295	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	296	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	297	static inline void blk_throtl_register_queue(struct request_queue *q) { }
db18a53e	298	static inline bool blk_throtl_bio(struct bio *bio) { return false; }
bc9fcbf9	299	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	300	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	301	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	302	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	303	const char *page, size_t count);
9e234eea	304	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	305	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	306	#else
9e234eea SL	307	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	308	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	309	#endif
bc9fcbf9	310
3bce016a CH	311	#ifdef CONFIG_BOUNCE
	312	extern int init_emergency_isa_pool(void);
	313	extern void blk_queue_bounce(struct request_queue q, struct bio *bio);
	314	#else
	315	static inline int init_emergency_isa_pool(void)
	316	{
	317	return 0;
	318	}
	319	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
	320	{
	321	}
	322	#endif /* CONFIG_BOUNCE */
	323
d7067512 JB	324	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	325	extern int blk_iolatency_init(struct request_queue *q);
	326	#else
	327	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	328	#endif
	329
a2d6b3a2 DLM	330	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	331
bf505456 DLM	332	#ifdef CONFIG_BLK_DEV_ZONED
	333	void blk_queue_free_zone_bitmaps(struct request_queue *q);
	334	#else
	335	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
	336	#endif
	337
8446fe92	338	struct block_device disk_map_sector_rcu(struct gendisk disk, sector_t sector);
581e2600	339
9fc995a6	340	int blk_alloc_devt(struct block_device part, dev_t devt);
581e2600	341	void blk_free_devt(dev_t devt);
581e2600 CH	342	char disk_name(struct gendisk hd, int partno, char *buf);
	343	#define ADDPART_FLAG_NONE 0
	344	#define ADDPART_FLAG_RAID 1
	345	#define ADDPART_FLAG_WHOLEDISK 2
0d02129e	346	void delete_partition(struct block_device *part);
fa9156ae CH	347	int bdev_add_partition(struct block_device *bdev, int partno,
	348	sector_t start, sector_t length);
	349	int bdev_del_partition(struct block_device *bdev, int partno);
	350	int bdev_resize_partition(struct block_device *bdev, int partno,
	351	sector_t start, sector_t length);
581e2600	352	int disk_expand_part_tbl(struct gendisk *disk, int target);
581e2600	353
e4581105	354	int bio_add_hw_page(struct request_queue q, struct bio bio,
130879f1	355	struct page *page, unsigned int len, unsigned int offset,
e4581105	356	unsigned int max_sectors, bool *same_page);
130879f1	357
bc9fcbf9	358	#endif /* BLK_INTERNAL_H */