[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 <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)

#ifdef CONFIG_DEBUG_FS
extern struct dentry *blk_debugfs_root;
#endif

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;

	/*
	 * flush_rq shares tag with this rq, both can't be active
	 * at the same time
	 */
	struct request		*orig_rq;
	struct lock_class_key	key;
	spinlock_t		mq_flush_lock;
};

extern struct kmem_cache *blk_requestq_cachep;
extern struct kobj_type blk_queue_ktype;
extern struct ida blk_queue_ida;

static inline struct blk_flush_queue *
blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx)
{
	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
}

static inline void __blk_get_queue(struct request_queue *q)
{
	kobject_get(&q->kobj);
}

static inline bool
is_flush_rq(struct request *req, struct blk_mq_hw_ctx *hctx)
{
	return hctx->fq->flush_rq == req;
}

struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
					      gfp_t flags);
void blk_free_flush_queue(struct blk_flush_queue *q);

void blk_freeze_queue(struct request_queue *q);

static inline bool biovec_phys_mergeable(struct request_queue *q,
		struct bio_vec *vec1, struct bio_vec *vec2)
{
	unsigned long mask = queue_segment_boundary(q);
	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;

	if (addr1 + vec1->bv_len != addr2)
		return false;
	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
		return false;
	if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask))
		return false;
	return true;
}

static inline bool __bvec_gap_to_prev(struct request_queue *q,
		struct bio_vec *bprv, unsigned int offset)
{
	return (offset & queue_virt_boundary(q)) ||
		((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
}

/*
 * Check if adding a bio_vec after bprv with offset would create a gap in
 * the SG list. Most drivers don't care about this, but some do.
 */
static inline bool bvec_gap_to_prev(struct request_queue *q,
		struct bio_vec *bprv, unsigned int offset)
{
	if (!queue_virt_boundary(q))
		return false;
	return __bvec_gap_to_prev(q, bprv, offset);
}

static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
		unsigned int nr_segs)
{
	rq->nr_phys_segments = nr_segs;
	rq->__data_len = bio->bi_iter.bi_size;
	rq->bio = rq->biotail = bio;
	rq->ioprio = bio_prio(bio);

	if (bio->bi_disk)
		rq->rq_disk = bio->bi_disk;
}

#ifdef CONFIG_BLK_DEV_INTEGRITY
void blk_flush_integrity(void);
bool __bio_integrity_endio(struct bio *);
void bio_integrity_free(struct bio *bio);
static inline bool bio_integrity_endio(struct bio *bio)
{
	if (bio_integrity(bio))
		return __bio_integrity_endio(bio);
	return true;
}

static inline bool integrity_req_gap_back_merge(struct request *req,
		struct bio *next)
{
	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	struct bio_integrity_payload *bip_next = bio_integrity(next);

	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
				bip_next->bip_vec[0].bv_offset);
}

static inline bool integrity_req_gap_front_merge(struct request *req,
		struct bio *bio)
{
	struct bio_integrity_payload *bip = bio_integrity(bio);
	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);

	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
				bip_next->bip_vec[0].bv_offset);
}

void blk_integrity_add(struct gendisk *);
void blk_integrity_del(struct gendisk *);
#else /* CONFIG_BLK_DEV_INTEGRITY */
static inline bool integrity_req_gap_back_merge(struct request *req,
		struct bio *next)
{
	return false;
}
static inline bool integrity_req_gap_front_merge(struct request *req,
		struct bio *bio)
{
	return false;
}

static inline void blk_flush_integrity(void)
{
}
static inline bool bio_integrity_endio(struct bio *bio)
{
	return true;
}
static inline void bio_integrity_free(struct bio *bio)
{
}
static inline void blk_integrity_add(struct gendisk *disk)
{
}
static inline void blk_integrity_del(struct gendisk *disk)
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

unsigned long blk_rq_timeout(unsigned long timeout);
void blk_add_timer(struct request *req);

bool bio_attempt_front_merge(struct request *req, struct bio *bio,
		unsigned int nr_segs);
bool bio_attempt_back_merge(struct request *req, struct bio *bio,
		unsigned int nr_segs);
bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
		struct bio *bio);
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
		unsigned int nr_segs, struct request **same_queue_rq);

void blk_account_io_start(struct request *req);
void blk_account_io_done(struct request *req, u64 now);

/*
 * Internal elevator interface
 */
#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)

void blk_insert_flush(struct request *rq);

void elevator_init_mq(struct request_queue *q);
int elevator_switch_mq(struct request_queue *q,
			      struct elevator_type *new_e);
void __elevator_exit(struct request_queue *, struct elevator_queue *);
int elv_register_queue(struct request_queue *q, bool uevent);
void elv_unregister_queue(struct request_queue *q);

static inline void elevator_exit(struct request_queue *q,
		struct elevator_queue *e)
{
	lockdep_assert_held(&q->sysfs_lock);

	blk_mq_sched_free_requests(q);
	__elevator_exit(q, e);
}

struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);

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

#ifdef CONFIG_FAIL_IO_TIMEOUT
int blk_should_fake_timeout(struct request_queue *);
ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
ssize_t part_timeout_store(struct device *, struct device_attribute *,
				const char *, size_t);
#else
static inline int blk_should_fake_timeout(struct request_queue *q)
{
	return 0;
}
#endif

void __blk_queue_split(struct request_queue *q, struct bio **bio,
		unsigned int *nr_segs);
int ll_back_merge_fn(struct request *req, struct bio *bio,
		unsigned int nr_segs);
int ll_front_merge_fn(struct request *req,  struct bio *bio,
		unsigned int nr_segs);
struct request *attempt_back_merge(struct request_queue *q, struct request *rq);
struct request *attempt_front_merge(struct request_queue *q, struct request *rq);
int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
				struct request *next);
unsigned int blk_recalc_rq_segments(struct request *rq);
void blk_rq_set_mixed_merge(struct request *rq);
bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);

int blk_dev_init(void);

/*
 * Contribute to IO statistics IFF:
 *
 *	a) it's attached to a gendisk, and
 *	b) the queue had IO stats enabled when this request was started
 */
static inline bool blk_do_io_stat(struct request *rq)
{
	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
}

static inline void req_set_nomerge(struct request_queue *q, struct request *req)
{
	req->cmd_flags |= REQ_NOMERGE;
	if (req == q->last_merge)
		q->last_merge = NULL;
}

/*
 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
 * is defined as 'unsigned int', meantime it has to aligned to with logical
 * block size which is the minimum accepted unit by hardware.
 */
static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
{
	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
}

/*
 * Internal io_context interface
 */
void get_io_context(struct io_context *ioc);
struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q);
struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q,
			     gfp_t gfp_mask);
void ioc_clear_queue(struct request_queue *q);

int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);

/*
 * Internal throttling interface
 */
#ifdef CONFIG_BLK_DEV_THROTTLING
extern int blk_throtl_init(struct request_queue *q);
extern void blk_throtl_exit(struct request_queue *q);
extern void blk_throtl_register_queue(struct request_queue *q);
#else /* CONFIG_BLK_DEV_THROTTLING */
static inline int blk_throtl_init(struct request_queue *q) { return 0; }
static inline void blk_throtl_exit(struct request_queue *q) { }
static inline void blk_throtl_register_queue(struct request_queue *q) { }
#endif /* CONFIG_BLK_DEV_THROTTLING */
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page);
extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	const char *page, size_t count);
extern void blk_throtl_bio_endio(struct bio *bio);
extern void blk_throtl_stat_add(struct request *rq, u64 time);
#else
static inline void blk_throtl_bio_endio(struct bio *bio) { }
static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
#endif

#ifdef CONFIG_BOUNCE
extern int init_emergency_isa_pool(void);
extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
#else
static inline int init_emergency_isa_pool(void)
{
	return 0;
}
static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
{
}
#endif /* CONFIG_BOUNCE */

#ifdef CONFIG_BLK_CGROUP_IOLATENCY
extern int blk_iolatency_init(struct request_queue *q);
#else
static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
#endif

struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp);

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

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

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

/* no need to get/put refcount of part0 */
static inline int hd_struct_try_get(struct hd_struct *part)
{
	if (part->partno)
		return percpu_ref_tryget_live(&part->ref);
	return 1;
}

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

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

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

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

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

struct request_queue *__blk_alloc_queue(int node_id);

int bio_add_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 OS	17	#ifdef CONFIG_DEBUG_FS
	18	extern struct dentry *blk_debugfs_root;
	19	#endif
	20
7c94e1c1	21	struct blk_flush_queue {
7c94e1c1 ML	22	unsigned int flush_pending_idx:1;
7c94e1c1 ML	23	unsigned int flush_running_idx:1;
8d699663	24	blk_status_t rq_status;
7c94e1c1 ML	25	unsigned long flush_pending_since;
	26	struct list_head flush_queue[2];
	27	struct list_head flush_data_in_flight;
	28	struct request *flush_rq;
0048b483 ML	29
	30	/*
	31	* flush_rq shares tag with this rq, both can't be active
	32	* at the same time
	33	*/
	34	struct request *orig_rq;
b3c6a599	35	struct lock_class_key key;
7c94e1c1 ML	36	spinlock_t mq_flush_lock;
	37	};
	38
8324aa91 JA	39	extern struct kmem_cache *blk_requestq_cachep;
8324aa91 JA	40	extern struct kobj_type blk_queue_ktype;
a73f730d	41	extern struct ida blk_queue_ida;
8324aa91	42
f9afca4d JA	43	static inline struct blk_flush_queue *
f9afca4d JA	44	blk_get_flush_queue(struct request_queue q, struct blk_mq_ctx ctx)
7c94e1c1	45	{
8ccdf4a3	46	return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq;
7c94e1c1 ML	47	}
7c94e1c1 ML	48
09ac46c4 TH	49	static inline void __blk_get_queue(struct request_queue *q)
	50	{
	51	kobject_get(&q->kobj);
	52	}
	53
8d699663 YY	54	static inline bool
	55	is_flush_rq(struct request req, struct blk_mq_hw_ctx hctx)
	56	{
	57	return hctx->fq->flush_rq == req;
	58	}
	59
754a1572 GJ	60	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	61	gfp_t flags);
f70ced09	62	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	63
3ef28e83 DW	64	void blk_freeze_queue(struct request_queue *q);
3ef28e83 DW	65
3dccdae5 CH	66	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	67	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	68	{
3dccdae5	69	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	70	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	71	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5 CH	72
3dccdae5 CH	73	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	74	return false;
0383ad43	75	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	76	return false;
3dccdae5 CH	77	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	78	return false;
6a9f5f24 CH	79	return true;
	80	}
	81
27ca1d4e CH	82	static inline bool __bvec_gap_to_prev(struct request_queue *q,
	83	struct bio_vec *bprv, unsigned int offset)
	84	{
df376b2e	85	return (offset & queue_virt_boundary(q)) \|\|
27ca1d4e CH	86	((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
	87	}
	88
	89	/*
	90	* Check if adding a bio_vec after bprv with offset would create a gap in
	91	* the SG list. Most drivers don't care about this, but some do.
	92	*/
	93	static inline bool bvec_gap_to_prev(struct request_queue *q,
	94	struct bio_vec *bprv, unsigned int offset)
	95	{
	96	if (!queue_virt_boundary(q))
	97	return false;
	98	return __bvec_gap_to_prev(q, bprv, offset);
	99	}
	100
1aa0a133 CH	101	static inline void blk_rq_bio_prep(struct request rq, struct bio bio,
	102	unsigned int nr_segs)
	103	{
	104	rq->nr_phys_segments = nr_segs;
	105	rq->__data_len = bio->bi_iter.bi_size;
	106	rq->bio = rq->biotail = bio;
	107	rq->ioprio = bio_prio(bio);
	108
	109	if (bio->bi_disk)
	110	rq->rq_disk = bio->bi_disk;
	111	}
	112
5a48fc14 DW	113	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	114	void blk_flush_integrity(void);
7c20f116	115	bool __bio_integrity_endio(struct bio *);
ece841ab	116	void bio_integrity_free(struct bio *bio);
7c20f116 CH	117	static inline bool bio_integrity_endio(struct bio *bio)
	118	{
	119	if (bio_integrity(bio))
	120	return __bio_integrity_endio(bio);
	121	return true;
	122	}
43b729bf CH	123
	124	static inline bool integrity_req_gap_back_merge(struct request *req,
	125	struct bio *next)
	126	{
	127	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	128	struct bio_integrity_payload *bip_next = bio_integrity(next);
	129
	130	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	131	bip_next->bip_vec[0].bv_offset);
	132	}
	133
	134	static inline bool integrity_req_gap_front_merge(struct request *req,
	135	struct bio *bio)
	136	{
	137	struct bio_integrity_payload *bip = bio_integrity(bio);
	138	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	139
	140	return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
	141	bip_next->bip_vec[0].bv_offset);
	142	}
581e2600 CH	143
	144	void blk_integrity_add(struct gendisk *);
	145	void blk_integrity_del(struct gendisk *);
43b729bf CH	146	#else /* CONFIG_BLK_DEV_INTEGRITY */
	147	static inline bool integrity_req_gap_back_merge(struct request *req,
	148	struct bio *next)
	149	{
	150	return false;
	151	}
	152	static inline bool integrity_req_gap_front_merge(struct request *req,
	153	struct bio *bio)
	154	{
	155	return false;
	156	}
	157
5a48fc14 DW	158	static inline void blk_flush_integrity(void)
	159	{
	160	}
7c20f116 CH	161	static inline bool bio_integrity_endio(struct bio *bio)
	162	{
	163	return true;
	164	}
ece841ab JT	165	static inline void bio_integrity_free(struct bio *bio)
	166	{
	167	}
581e2600 CH	168	static inline void blk_integrity_add(struct gendisk *disk)
	169	{
	170	}
	171	static inline void blk_integrity_del(struct gendisk *disk)
	172	{
	173	}
43b729bf	174	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	175
0d2602ca	176	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	177	void blk_add_timer(struct request *req);
320ae51f	178
14ccb66b CH	179	bool bio_attempt_front_merge(struct request req, struct bio bio,
	180	unsigned int nr_segs);
	181	bool bio_attempt_back_merge(struct request req, struct bio bio,
	182	unsigned int nr_segs);
1e739730 CH	183	bool bio_attempt_discard_merge(struct request_queue q, struct request req,
1e739730 CH	184	struct bio *bio);
320ae51f	185	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
14ccb66b	186	unsigned int nr_segs, struct request **same_queue_rq);
320ae51f	187
b5af37ab	188	void blk_account_io_start(struct request *req);
522a7775	189	void blk_account_io_done(struct request *req, u64 now);
320ae51f	190
158dbda0 TH	191	/*
	192	* Internal elevator interface
	193	*/
e8064021	194	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	195
ae1b1539	196	void blk_insert_flush(struct request *rq);
dd831006	197
954b4a5c	198	void elevator_init_mq(struct request_queue *q);
d48ece20 JW	199	int elevator_switch_mq(struct request_queue *q,
d48ece20 JW	200	struct elevator_type *new_e);
c3e22192	201	void __elevator_exit(struct request_queue , struct elevator_queue );
cecf5d87	202	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	203	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	204
c3e22192 ML	205	static inline void elevator_exit(struct request_queue *q,
	206	struct elevator_queue *e)
	207	{
284b94be ML	208	lockdep_assert_held(&q->sysfs_lock);
284b94be ML	209
c3e22192 ML	210	blk_mq_sched_free_requests(q);
	211	__elevator_exit(q, e);
	212	}
	213
807d4af2 CH	214	struct hd_struct __disk_get_part(struct gendisk disk, int partno);
807d4af2 CH	215
3ad5cee5 CH	216	ssize_t part_size_show(struct device dev, struct device_attribute attr,
	217	char *buf);
	218	ssize_t part_stat_show(struct device dev, struct device_attribute attr,
	219	char *buf);
	220	ssize_t part_inflight_show(struct device dev, struct device_attribute attr,
	221	char *buf);
	222	ssize_t part_fail_show(struct device dev, struct device_attribute attr,
	223	char *buf);
	224	ssize_t part_fail_store(struct device dev, struct device_attribute attr,
	225	const char *buf, size_t count);
	226
581d4e28 JA	227	#ifdef CONFIG_FAIL_IO_TIMEOUT
	228	int blk_should_fake_timeout(struct request_queue *);
	229	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	230	ssize_t part_timeout_store(struct device , struct device_attribute ,
	231	const char *, size_t);
	232	#else
	233	static inline int blk_should_fake_timeout(struct request_queue *q)
	234	{
	235	return 0;
	236	}
	237	#endif
	238
14ccb66b CH	239	void __blk_queue_split(struct request_queue q, struct bio *bio,
	240	unsigned int *nr_segs);
	241	int ll_back_merge_fn(struct request req, struct bio bio,
	242	unsigned int nr_segs);
	243	int ll_front_merge_fn(struct request req, struct bio bio,
	244	unsigned int nr_segs);
b973cb7e JA	245	struct request attempt_back_merge(struct request_queue q, struct request *rq);
b973cb7e JA	246	struct request attempt_front_merge(struct request_queue q, struct request *rq);
5e84ea3a JA	247	int blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a JA	248	struct request *next);
e9cd19c0	249	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	250	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	251	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	252	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	253
ff88972c AB	254	int blk_dev_init(void);
ff88972c AB	255
c2553b58 JA	256	/*
	257	* Contribute to IO statistics IFF:
	258	*
	259	* a) it's attached to a gendisk, and
48d9b0d4	260	* b) the queue had IO stats enabled when this request was started
c2553b58	261	*/
599d067d	262	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	263	{
48d9b0d4	264	return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
fb8ec18c JA	265	}
fb8ec18c JA	266
6cf7677f CH	267	static inline void req_set_nomerge(struct request_queue q, struct request req)
	268	{
	269	req->cmd_flags \|= REQ_NOMERGE;
	270	if (req == q->last_merge)
	271	q->last_merge = NULL;
	272	}
	273
1adfc5e4 ML	274	/*
	275	* The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
	276	* is defined as 'unsigned int', meantime it has to aligned to with logical
	277	* block size which is the minimum accepted unit by hardware.
	278	*/
	279	static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
	280	{
	281	return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
	282	}
	283
f2dbd76a TH	284	/*
	285	* Internal io_context interface
	286	*/
	287	void get_io_context(struct io_context *ioc);
47fdd4ca	288	struct io_cq ioc_lookup_icq(struct io_context ioc, struct request_queue *q);
24acfc34 TH	289	struct io_cq ioc_create_icq(struct io_context ioc, struct request_queue *q,
24acfc34 TH	290	gfp_t gfp_mask);
7e5a8794	291	void ioc_clear_queue(struct request_queue *q);
f2dbd76a	292
24acfc34	293	int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node);
f2dbd76a	294
f2dbd76a TH	295	/*
	296	* Internal throttling interface
	297	*/
bc9fcbf9	298	#ifdef CONFIG_BLK_DEV_THROTTLING
bc9fcbf9 TH	299	extern int blk_throtl_init(struct request_queue *q);
bc9fcbf9 TH	300	extern void blk_throtl_exit(struct request_queue *q);
d61fcfa4	301	extern void blk_throtl_register_queue(struct request_queue *q);
bc9fcbf9	302	#else /* CONFIG_BLK_DEV_THROTTLING */
bc9fcbf9 TH	303	static inline int blk_throtl_init(struct request_queue *q) { return 0; }
bc9fcbf9 TH	304	static inline void blk_throtl_exit(struct request_queue *q) { }
d61fcfa4	305	static inline void blk_throtl_register_queue(struct request_queue *q) { }
bc9fcbf9	306	#endif /* CONFIG_BLK_DEV_THROTTLING */
297e3d85 SL	307	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	308	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	309	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	310	const char *page, size_t count);
9e234eea	311	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	312	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	313	#else
9e234eea SL	314	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	315	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	316	#endif
bc9fcbf9	317
3bce016a CH	318	#ifdef CONFIG_BOUNCE
	319	extern int init_emergency_isa_pool(void);
	320	extern void blk_queue_bounce(struct request_queue q, struct bio *bio);
	321	#else
	322	static inline int init_emergency_isa_pool(void)
	323	{
	324	return 0;
	325	}
	326	static inline void blk_queue_bounce(struct request_queue q, struct bio *bio)
	327	{
	328	}
	329	#endif /* CONFIG_BOUNCE */
	330
d7067512 JB	331	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
	332	extern int blk_iolatency_init(struct request_queue *q);
	333	#else
	334	static inline int blk_iolatency_init(struct request_queue *q) { return 0; }
	335	#endif
	336
a2d6b3a2 DLM	337	struct bio blk_next_bio(struct bio bio, unsigned int nr_pages, gfp_t gfp);
a2d6b3a2 DLM	338
bf505456 DLM	339	#ifdef CONFIG_BLK_DEV_ZONED
	340	void blk_queue_free_zone_bitmaps(struct request_queue *q);
	341	#else
	342	static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {}
	343	#endif
	344
581e2600 CH	345	struct hd_struct disk_map_sector_rcu(struct gendisk disk, sector_t sector);
	346
	347	int blk_alloc_devt(struct hd_struct part, dev_t devt);
	348	void blk_free_devt(dev_t devt);
	349	void blk_invalidate_devt(dev_t devt);
	350	char disk_name(struct gendisk hd, int partno, char *buf);
	351	#define ADDPART_FLAG_NONE 0
	352	#define ADDPART_FLAG_RAID 1
	353	#define ADDPART_FLAG_WHOLEDISK 2
cddae808	354	void delete_partition(struct gendisk disk, struct hd_struct part);
fa9156ae CH	355	int bdev_add_partition(struct block_device *bdev, int partno,
	356	sector_t start, sector_t length);
	357	int bdev_del_partition(struct block_device *bdev, int partno);
	358	int bdev_resize_partition(struct block_device *bdev, int partno,
	359	sector_t start, sector_t length);
581e2600	360	int disk_expand_part_tbl(struct gendisk *disk, int target);
8da2892e	361	int hd_ref_init(struct hd_struct *part);
581e2600	362
27eb3af9	363	/* no need to get/put refcount of part0 */
581e2600 CH	364	static inline int hd_struct_try_get(struct hd_struct *part)
581e2600 CH	365	{
27eb3af9 ML	366	if (part->partno)
	367	return percpu_ref_tryget_live(&part->ref);
	368	return 1;
581e2600 CH	369	}
	370
	371	static inline void hd_struct_put(struct hd_struct *part)
	372	{
27eb3af9 ML	373	if (part->partno)
27eb3af9 ML	374	percpu_ref_put(&part->ref);
581e2600 CH	375	}
581e2600 CH	376
581e2600 CH	377	static inline void hd_free_part(struct hd_struct *part)
581e2600 CH	378	{
58d4f14f	379	free_percpu(part->dkstats);
581e2600 CH	380	kfree(part->info);
	381	percpu_ref_exit(&part->ref);
	382	}
	383
	384	/*
	385	* Any access of part->nr_sects which is not protected by partition
	386	* bd_mutex or gendisk bdev bd_mutex, should be done using this
	387	* accessor function.
	388	*
	389	* Code written along the lines of i_size_read() and i_size_write().
	390	* CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
	391	* on.
	392	*/
	393	static inline sector_t part_nr_sects_read(struct hd_struct *part)
	394	{
	395	#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	396	sector_t nr_sects;
	397	unsigned seq;
	398	do {
	399	seq = read_seqcount_begin(&part->nr_sects_seq);
	400	nr_sects = part->nr_sects;
	401	} while (read_seqcount_retry(&part->nr_sects_seq, seq));
	402	return nr_sects;
	403	#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
	404	sector_t nr_sects;
	405
	406	preempt_disable();
	407	nr_sects = part->nr_sects;
	408	preempt_enable();
	409	return nr_sects;
	410	#else
	411	return part->nr_sects;
	412	#endif
	413	}
	414
	415	/*
	416	* Should be called with mutex lock held (typically bd_mutex) of partition
	417	* to provide mutual exlusion among writers otherwise seqcount might be
	418	* left in wrong state leaving the readers spinning infinitely.
	419	*/
	420	static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
	421	{
	422	#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
	423	write_seqcount_begin(&part->nr_sects_seq);
	424	part->nr_sects = size;
	425	write_seqcount_end(&part->nr_sects_seq);
	426	#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
	427	preempt_disable();
	428	part->nr_sects = size;
	429	preempt_enable();
	430	#else
	431	part->nr_sects = size;
	432	#endif
	433	}
	434
3d745ea5 CH	435	struct request_queue *__blk_alloc_queue(int node_id);
3d745ea5 CH	436
e4581105	437	int bio_add_hw_page(struct request_queue q, struct bio bio,
130879f1	438	struct page *page, unsigned int len, unsigned int offset,
e4581105	439	unsigned int max_sectors, bool *same_page);
130879f1	440
bc9fcbf9	441	#endif /* BLK_INTERNAL_H */