[linux-2.6-block.git] / block / blk.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BLK_INTERNAL_H
#define BLK_INTERNAL_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"

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;
};

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);
int __bio_queue_enter(struct request_queue *q, struct bio *bio);
void submit_bio_noacct_nocheck(struct bio *bio);

static inline bool blk_try_enter_queue(struct request_queue *q, bool pm)
{
	rcu_read_lock();
	if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
		goto fail;

	/*
	 * The code that increments the pm_only counter must ensure that the
	 * counter is globally visible before the queue is unfrozen.
	 */
	if (blk_queue_pm_only(q) &&
	    (!pm || queue_rpm_status(q) == RPM_SUSPENDED))
		goto fail_put;

	rcu_read_unlock();
	return true;

fail_put:
	blk_queue_exit(q);
fail:
	rcu_read_unlock();
	return false;
}

static inline int bio_queue_enter(struct bio *bio)
{
	struct request_queue *q = bdev_get_queue(bio->bi_bdev);

	if (blk_try_enter_queue(q, false))
		return 0;
	return __bio_queue_enter(q, bio);
}

#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;

	/*
	 * Merging adjacent physical pages may not work correctly under KMSAN
	 * if their metadata pages aren't adjacent. Just disable merging.
	 */
	if (IS_ENABLED(CONFIG_KMSAN))
		return false;

	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(const struct queue_limits *lim,
		struct bio_vec *bprv, unsigned int offset)
{
	return (offset & lim->virt_boundary_mask) ||
		((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask);
}

/*
 * 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(const struct queue_limits *lim,
		struct bio_vec *bprv, unsigned int offset)
{
	if (!lim->virt_boundary_mask)
		return false;
	return __bvec_gap_to_prev(lim, 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;
}

static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
						     enum req_op op)
{
	if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
		return min(q->limits.max_discard_sectors,
			   UINT_MAX >> SECTOR_SHIFT);

	if (unlikely(op == REQ_OP_WRITE_ZEROES))
		return q->limits.max_write_zeroes_sectors;

	return q->limits.max_sectors;
}

#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->limits,
				&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->limits,
				&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);
const char *blk_status_to_str(blk_status_t status);

bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
		unsigned int nr_segs);
bool blk_bio_list_merge(struct request_queue *q, struct list_head *list,
			struct bio *bio, unsigned int nr_segs);

/*
 * 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(struct request_queue *q, struct elevator_type *new_e);
void elevator_disable(struct request_queue *q);
void elevator_exit(struct request_queue *q);
int elv_register_queue(struct request_queue *q, bool uevent);
void elv_unregister_queue(struct request_queue *q);

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);

static inline bool bio_may_exceed_limits(struct bio *bio,
					 const struct queue_limits *lim)
{
	switch (bio_op(bio)) {
	case REQ_OP_DISCARD:
	case REQ_OP_SECURE_ERASE:
	case REQ_OP_WRITE_ZEROES:
		return true; /* non-trivial splitting decisions */
	default:
		break;
	}

	/*
	 * All drivers must accept single-segments bios that are <= PAGE_SIZE.
	 * This is a quick and dirty check that relies on the fact that
	 * bi_io_vec[0] is always valid if a bio has data.  The check might
	 * lead to occasional false negatives when bios are cloned, but compared
	 * to the performance impact of cloned bios themselves the loop below
	 * doesn't matter anyway.
	 */
	return lim->chunk_sectors || bio->bi_vcnt != 1 ||
		bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE;
}

struct bio *__bio_split_to_limits(struct bio *bio,
				  const struct queue_limits *lim,
				  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);

void blk_set_default_limits(struct queue_limits *lim);
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_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq);
}

void update_io_ticks(struct block_device *part, unsigned long now, bool end);

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;
}

/*
 * Internal io_context interface
 */
struct io_cq *ioc_find_get_icq(struct request_queue *q);
struct io_cq *ioc_lookup_icq(struct request_queue *q);
#ifdef CONFIG_BLK_ICQ
void ioc_clear_queue(struct request_queue *q);
#else
static inline void ioc_clear_queue(struct request_queue *q)
{
}
#endif /* CONFIG_BLK_ICQ */

#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

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

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

#ifdef CONFIG_BLK_CGROUP_IOLATENCY
int blk_iolatency_init(struct gendisk *disk);
#else
static inline int blk_iolatency_init(struct gendisk *disk) { return 0; };
#endif

#ifdef CONFIG_BLK_DEV_ZONED
void disk_free_zone_bitmaps(struct gendisk *disk);
void disk_clear_zone_settings(struct gendisk *disk);
#else
static inline void disk_free_zone_bitmaps(struct gendisk *disk) {}
static inline void disk_clear_zone_settings(struct gendisk *disk) {}
#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);
void blk_drop_partitions(struct gendisk *disk);

struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
		struct lock_class_key *lkclass);

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_scan_partitions(struct gendisk *disk, fmode_t mode, void *owner);

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);
void disk_block_events(struct gendisk *disk);
void disk_unblock_events(struct gendisk *disk);
void disk_flush_events(struct gendisk *disk, unsigned int mask);
extern struct device_attribute dev_attr_events;
extern struct device_attribute dev_attr_events_async;
extern struct device_attribute dev_attr_events_poll_msecs;

extern struct attribute_group blk_trace_attr_group;

long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);

extern const struct address_space_operations def_blk_aops;

int disk_register_independent_access_ranges(struct gendisk *disk);
void disk_unregister_independent_access_ranges(struct gendisk *disk);

#ifdef CONFIG_FAIL_MAKE_REQUEST
bool should_fail_request(struct block_device *part, unsigned int bytes);
#else /* CONFIG_FAIL_MAKE_REQUEST */
static inline bool should_fail_request(struct block_device *part,
					unsigned int bytes)
{
	return false;
}
#endif /* CONFIG_FAIL_MAKE_REQUEST */

/*
 * Optimized request reference counting. Ideally we'd make timeouts be more
 * clever, as that's the only reason we need references at all... But until
 * this happens, this is faster than using refcount_t. Also see:
 *
 * abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count")
 */
#define req_ref_zero_or_close_to_overflow(req)	\
	((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u)

static inline bool req_ref_inc_not_zero(struct request *req)
{
	return atomic_inc_not_zero(&req->ref);
}

static inline bool req_ref_put_and_test(struct request *req)
{
	WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
	return atomic_dec_and_test(&req->ref);
}

static inline void req_ref_set(struct request *req, int value)
{
	atomic_set(&req->ref, value);
}

static inline int req_ref_read(struct request *req)
{
	return atomic_read(&req->ref);
}

#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
a892c8d5	5	#include <linux/blk-crypto.h>
9bb33f24	6	#include <linux/memblock.h> /* for max_pfn/max_low_pfn */
c39ae60d	7	#include <xen/xen.h>
a892c8d5	8	#include "blk-crypto-internal.h"
a73f730d	9
2e9bc346 CH	10	struct elevator_type;
2e9bc346 CH	11
0d2602ca JA	12	/* Max future timer expiry for timeouts */
	13	#define BLK_MAX_TIMEOUT (5 * HZ)
	14
18fbda91	15	extern struct dentry *blk_debugfs_root;
18fbda91	16
7c94e1c1	17	struct blk_flush_queue {
7c94e1c1 ML	18	unsigned int flush_pending_idx:1;
7c94e1c1 ML	19	unsigned int flush_running_idx:1;
8d699663	20	blk_status_t rq_status;
7c94e1c1 ML	21	unsigned long flush_pending_since;
	22	struct list_head flush_queue[2];
	23	struct list_head flush_data_in_flight;
	24	struct request *flush_rq;
0048b483	25
7c94e1c1 ML	26	spinlock_t mq_flush_lock;
	27	};
	28
a9ed27a7	29	bool is_flush_rq(struct request *req);
8d699663	30
754a1572 GJ	31	struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
754a1572 GJ	32	gfp_t flags);
f70ced09	33	void blk_free_flush_queue(struct blk_flush_queue *q);
f3552655	34
3ef28e83	35	void blk_freeze_queue(struct request_queue *q);
aec89dc5	36	void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
8e141f9e	37	void blk_queue_start_drain(struct request_queue *q);
c98cb5bb	38	int __bio_queue_enter(struct request_queue q, struct bio bio);
3f98c753	39	void submit_bio_noacct_nocheck(struct bio *bio);
c98cb5bb JA	40
	41	static inline bool blk_try_enter_queue(struct request_queue *q, bool pm)
	42	{
	43	rcu_read_lock();
	44	if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter))
	45	goto fail;
	46
	47	/*
	48	* The code that increments the pm_only counter must ensure that the
	49	* counter is globally visible before the queue is unfrozen.
	50	*/
	51	if (blk_queue_pm_only(q) &&
	52	(!pm \|\| queue_rpm_status(q) == RPM_SUSPENDED))
	53	goto fail_put;
	54
	55	rcu_read_unlock();
	56	return true;
	57
	58	fail_put:
	59	blk_queue_exit(q);
	60	fail:
	61	rcu_read_unlock();
	62	return false;
	63	}
	64
	65	static inline int bio_queue_enter(struct bio *bio)
	66	{
	67	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
	68
	69	if (blk_try_enter_queue(q, false))
	70	return 0;
	71	return __bio_queue_enter(q, bio);
	72	}
3ef28e83	73
dc0b8a57	74	#define BIO_INLINE_VECS 4
7a800a20 CH	75	struct bio_vec bvec_alloc(mempool_t pool, unsigned short *nr_vecs,
	76	gfp_t gfp_mask);
	77	void bvec_free(mempool_t pool, struct bio_vec bv, unsigned short nr_vecs);
eec716a1	78
3dccdae5 CH	79	static inline bool biovec_phys_mergeable(struct request_queue *q,
3dccdae5 CH	80	struct bio_vec vec1, struct bio_vec vec2)
6a9f5f24	81	{
3dccdae5	82	unsigned long mask = queue_segment_boundary(q);
6e768461 CH	83	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
6e768461 CH	84	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
3dccdae5	85
f630a5d0 AP	86	/*
	87	* Merging adjacent physical pages may not work correctly under KMSAN
	88	* if their metadata pages aren't adjacent. Just disable merging.
	89	*/
	90	if (IS_ENABLED(CONFIG_KMSAN))
	91	return false;
	92
3dccdae5	93	if (addr1 + vec1->bv_len != addr2)
6a9f5f24	94	return false;
0383ad43	95	if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page))
6a9f5f24	96	return false;
3dccdae5 CH	97	if ((addr1 \| mask) != ((addr2 + vec2->bv_len - 1) \| mask))
3dccdae5 CH	98	return false;
6a9f5f24 CH	99	return true;
	100	}
	101
aa261f20	102	static inline bool __bvec_gap_to_prev(const struct queue_limits *lim,
27ca1d4e CH	103	struct bio_vec *bprv, unsigned int offset)
27ca1d4e CH	104	{
c55ddd90 CH	105	return (offset & lim->virt_boundary_mask) \|\|
c55ddd90 CH	106	((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask);
27ca1d4e CH	107	}
	108
	109	/*
	110	* Check if adding a bio_vec after bprv with offset would create a gap in
	111	* the SG list. Most drivers don't care about this, but some do.
	112	*/
aa261f20	113	static inline bool bvec_gap_to_prev(const struct queue_limits *lim,
27ca1d4e CH	114	struct bio_vec *bprv, unsigned int offset)
27ca1d4e CH	115	{
c55ddd90	116	if (!lim->virt_boundary_mask)
27ca1d4e	117	return false;
c55ddd90	118	return __bvec_gap_to_prev(lim, bprv, offset);
27ca1d4e CH	119	}
27ca1d4e CH	120
badf7f64 CH	121	static inline bool rq_mergeable(struct request *rq)
	122	{
	123	if (blk_rq_is_passthrough(rq))
	124	return false;
	125
	126	if (req_op(rq) == REQ_OP_FLUSH)
	127	return false;
	128
	129	if (req_op(rq) == REQ_OP_WRITE_ZEROES)
	130	return false;
	131
	132	if (req_op(rq) == REQ_OP_ZONE_APPEND)
	133	return false;
	134
	135	if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
	136	return false;
	137	if (rq->rq_flags & RQF_NOMERGE_FLAGS)
	138	return false;
	139
	140	return true;
	141	}
	142
	143	/*
	144	* There are two different ways to handle DISCARD merges:
	145	* 1) If max_discard_segments > 1, the driver treats every bio as a range and
	146	* send the bios to controller together. The ranges don't need to be
	147	* contiguous.
	148	* 2) Otherwise, the request will be normal read/write requests. The ranges
	149	* need to be contiguous.
	150	*/
	151	static inline bool blk_discard_mergable(struct request *req)
	152	{
	153	if (req_op(req) == REQ_OP_DISCARD &&
	154	queue_max_discard_segments(req->q) > 1)
	155	return true;
	156	return false;
	157	}
	158
2a9336c4	159	static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
77e7ffd7	160	enum req_op op)
2a9336c4 CH	161	{
	162	if (unlikely(op == REQ_OP_DISCARD \|\| op == REQ_OP_SECURE_ERASE))
	163	return min(q->limits.max_discard_sectors,
	164	UINT_MAX >> SECTOR_SHIFT);
	165
	166	if (unlikely(op == REQ_OP_WRITE_ZEROES))
	167	return q->limits.max_write_zeroes_sectors;
	168
	169	return q->limits.max_sectors;
	170	}
	171
5a48fc14 DW	172	#ifdef CONFIG_BLK_DEV_INTEGRITY
5a48fc14 DW	173	void blk_flush_integrity(void);
7c20f116	174	bool __bio_integrity_endio(struct bio *);
ece841ab	175	void bio_integrity_free(struct bio *bio);
7c20f116 CH	176	static inline bool bio_integrity_endio(struct bio *bio)
	177	{
	178	if (bio_integrity(bio))
	179	return __bio_integrity_endio(bio);
	180	return true;
	181	}
43b729bf	182
92cf2fd1 CH	183	bool blk_integrity_merge_rq(struct request_queue , struct request ,
92cf2fd1 CH	184	struct request *);
d59da419 CH	185	bool blk_integrity_merge_bio(struct request_queue , struct request ,
d59da419 CH	186	struct bio *);
92cf2fd1	187
43b729bf CH	188	static inline bool integrity_req_gap_back_merge(struct request *req,
	189	struct bio *next)
	190	{
	191	struct bio_integrity_payload *bip = bio_integrity(req->bio);
	192	struct bio_integrity_payload *bip_next = bio_integrity(next);
	193
c55ddd90 CH	194	return bvec_gap_to_prev(&req->q->limits,
c55ddd90 CH	195	&bip->bip_vec[bip->bip_vcnt - 1],
43b729bf CH	196	bip_next->bip_vec[0].bv_offset);
	197	}
	198
	199	static inline bool integrity_req_gap_front_merge(struct request *req,
	200	struct bio *bio)
	201	{
	202	struct bio_integrity_payload *bip = bio_integrity(bio);
	203	struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
	204
c55ddd90 CH	205	return bvec_gap_to_prev(&req->q->limits,
c55ddd90 CH	206	&bip->bip_vec[bip->bip_vcnt - 1],
43b729bf CH	207	bip_next->bip_vec[0].bv_offset);
43b729bf CH	208	}
581e2600	209
614310c9	210	int blk_integrity_add(struct gendisk *disk);
581e2600	211	void blk_integrity_del(struct gendisk *);
43b729bf	212	#else /* CONFIG_BLK_DEV_INTEGRITY */
92cf2fd1 CH	213	static inline bool blk_integrity_merge_rq(struct request_queue *rq,
	214	struct request r1, struct request r2)
	215	{
	216	return true;
	217	}
d59da419 CH	218	static inline bool blk_integrity_merge_bio(struct request_queue *rq,
	219	struct request r, struct bio b)
	220	{
	221	return true;
	222	}
43b729bf CH	223	static inline bool integrity_req_gap_back_merge(struct request *req,
	224	struct bio *next)
	225	{
	226	return false;
	227	}
	228	static inline bool integrity_req_gap_front_merge(struct request *req,
	229	struct bio *bio)
	230	{
	231	return false;
	232	}
	233
5a48fc14 DW	234	static inline void blk_flush_integrity(void)
	235	{
	236	}
7c20f116 CH	237	static inline bool bio_integrity_endio(struct bio *bio)
	238	{
	239	return true;
	240	}
ece841ab JT	241	static inline void bio_integrity_free(struct bio *bio)
	242	{
	243	}
614310c9	244	static inline int blk_integrity_add(struct gendisk *disk)
581e2600	245	{
614310c9	246	return 0;
581e2600 CH	247	}
	248	static inline void blk_integrity_del(struct gendisk *disk)
	249	{
	250	}
43b729bf	251	#endif /* CONFIG_BLK_DEV_INTEGRITY */
8324aa91	252
0d2602ca	253	unsigned long blk_rq_timeout(unsigned long timeout);
87ee7b11	254	void blk_add_timer(struct request *req);
0d7a29a2	255	const char *blk_status_to_str(blk_status_t status);
320ae51f	256
320ae51f	257	bool blk_attempt_plug_merge(struct request_queue q, struct bio bio,
0c5bcc92	258	unsigned int nr_segs);
bdc6a287 BW	259	bool blk_bio_list_merge(struct request_queue q, struct list_head list,
bdc6a287 BW	260	struct bio *bio, unsigned int nr_segs);
320ae51f	261
ba0ffdd8 JA	262	/*
	263	* Plug flush limits
	264	*/
	265	#define BLK_MAX_REQUEST_COUNT 32
	266	#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
	267
158dbda0 TH	268	/*
	269	* Internal elevator interface
	270	*/
e8064021	271	#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED)
158dbda0	272
2b504bd4	273	void blk_insert_flush(struct request *rq);
dd831006	274
8237c01f	275	int elevator_switch(struct request_queue q, struct elevator_type new_e);
64b36075	276	void elevator_disable(struct request_queue *q);
0c6cb3a2	277	void elevator_exit(struct request_queue *q);
cecf5d87	278	int elv_register_queue(struct request_queue *q, bool uevent);
83d016ac BVA	279	void elv_unregister_queue(struct request_queue *q);
83d016ac BVA	280
3ad5cee5 CH	281	ssize_t part_size_show(struct device dev, struct device_attribute attr,
	282	char *buf);
	283	ssize_t part_stat_show(struct device dev, struct device_attribute attr,
	284	char *buf);
	285	ssize_t part_inflight_show(struct device dev, struct device_attribute attr,
	286	char *buf);
	287	ssize_t part_fail_show(struct device dev, struct device_attribute attr,
	288	char *buf);
	289	ssize_t part_fail_store(struct device dev, struct device_attribute attr,
	290	const char *buf, size_t count);
581d4e28 JA	291	ssize_t part_timeout_show(struct device , struct device_attribute , char *);
	292	ssize_t part_timeout_store(struct device , struct device_attribute ,
	293	const char *, size_t);
581d4e28	294
c55ddd90	295	static inline bool bio_may_exceed_limits(struct bio *bio,
aa261f20	296	const struct queue_limits *lim)
abd45c15 JA	297	{
	298	switch (bio_op(bio)) {
	299	case REQ_OP_DISCARD:
	300	case REQ_OP_SECURE_ERASE:
	301	case REQ_OP_WRITE_ZEROES:
abd45c15 JA	302	return true; /* non-trivial splitting decisions */
	303	default:
	304	break;
	305	}
	306
	307	/*
	308	* All drivers must accept single-segments bios that are <= PAGE_SIZE.
	309	* This is a quick and dirty check that relies on the fact that
	310	* bi_io_vec[0] is always valid if a bio has data. The check might
	311	* lead to occasional false negatives when bios are cloned, but compared
	312	* to the performance impact of cloned bios themselves the loop below
	313	* doesn't matter anyway.
	314	*/
c55ddd90	315	return lim->chunk_sectors \|\| bio->bi_vcnt != 1 \|\|
abd45c15 JA	316	bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE;
	317	}
	318
aa261f20 BVA	319	struct bio __bio_split_to_limits(struct bio bio,
	320	const struct queue_limits *lim,
	321	unsigned int *nr_segs);
14ccb66b CH	322	int ll_back_merge_fn(struct request req, struct bio bio,
14ccb66b CH	323	unsigned int nr_segs);
fd2ef39c	324	bool blk_attempt_req_merge(struct request_queue q, struct request rq,
5e84ea3a	325	struct request *next);
e9cd19c0	326	unsigned int blk_recalc_rq_segments(struct request *rq);
80a761fd	327	void blk_rq_set_mixed_merge(struct request *rq);
050c8ea8	328	bool blk_rq_merge_ok(struct request rq, struct bio bio);
34fe7c05	329	enum elv_merge blk_try_merge(struct request rq, struct bio bio);
d6d48196	330
b3228254	331	void blk_set_default_limits(struct queue_limits *lim);
ff88972c AB	332	int blk_dev_init(void);
ff88972c AB	333
c2553b58 JA	334	/*
	335	* Contribute to IO statistics IFF:
	336	*
	337	* a) it's attached to a gendisk, and
48d9b0d4	338	* b) the queue had IO stats enabled when this request was started
c2553b58	339	*/
599d067d	340	static inline bool blk_do_io_stat(struct request *rq)
fb8ec18c	341	{
41fa7222	342	return (rq->rq_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq);
be6bfe36 PB	343	}
be6bfe36 PB	344
450b7879	345	void update_io_ticks(struct block_device *part, unsigned long now, bool end);
fb8ec18c	346
6cf7677f CH	347	static inline void req_set_nomerge(struct request_queue q, struct request req)
	348	{
	349	req->cmd_flags \|= REQ_NOMERGE;
	350	if (req == q->last_merge)
	351	q->last_merge = NULL;
	352	}
	353
f2dbd76a TH	354	/*
	355	* Internal io_context interface
	356	*/
87dd1d63	357	struct io_cq ioc_find_get_icq(struct request_queue q);
eca5892a	358	struct io_cq ioc_lookup_icq(struct request_queue q);
5ef16305	359	#ifdef CONFIG_BLK_ICQ
7e5a8794	360	void ioc_clear_queue(struct request_queue *q);
5ef16305 CH	361	#else
	362	static inline void ioc_clear_queue(struct request_queue *q)
	363	{
	364	}
	365	#endif /* CONFIG_BLK_ICQ */
f2dbd76a	366
297e3d85 SL	367	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	368	extern ssize_t blk_throtl_sample_time_show(struct request_queue q, char page);
	369	extern ssize_t blk_throtl_sample_time_store(struct request_queue *q,
	370	const char *page, size_t count);
9e234eea	371	extern void blk_throtl_bio_endio(struct bio *bio);
b9147dd1	372	extern void blk_throtl_stat_add(struct request *rq, u64 time);
9e234eea SL	373	#else
9e234eea SL	374	static inline void blk_throtl_bio_endio(struct bio *bio) { }
b9147dd1	375	static inline void blk_throtl_stat_add(struct request *rq, u64 time) { }
297e3d85	376	#endif
bc9fcbf9	377
51d798cd	378	struct bio __blk_queue_bounce(struct bio bio, struct request_queue *q);
9bb33f24 CH	379
	380	static inline bool blk_queue_may_bounce(struct request_queue *q)
	381	{
	382	return IS_ENABLED(CONFIG_BOUNCE) &&
	383	q->limits.bounce == BLK_BOUNCE_HIGH &&
	384	max_low_pfn >= max_pfn;
	385	}
	386
51d798cd CH	387	static inline struct bio blk_queue_bounce(struct bio bio,
51d798cd CH	388	struct request_queue *q)
3bce016a	389	{
51d798cd CH	390	if (unlikely(blk_queue_may_bounce(q) && bio_has_data(bio)))
	391	return __blk_queue_bounce(bio, q);
	392	return bio;
3bce016a	393	}
3bce016a	394
d7067512	395	#ifdef CONFIG_BLK_CGROUP_IOLATENCY
16fac1b5	396	int blk_iolatency_init(struct gendisk *disk);
d7067512	397	#else
16fac1b5	398	static inline int blk_iolatency_init(struct gendisk *disk) { return 0; };
d7067512 JB	399	#endif
d7067512 JB	400
bf505456	401	#ifdef CONFIG_BLK_DEV_ZONED
5d400665	402	void disk_free_zone_bitmaps(struct gendisk *disk);
b3c72f81	403	void disk_clear_zone_settings(struct gendisk *disk);
bf505456	404	#else
5d400665	405	static inline void disk_free_zone_bitmaps(struct gendisk *disk) {}
b3c72f81	406	static inline void disk_clear_zone_settings(struct gendisk *disk) {}
bf505456 DLM	407	#endif
bf505456 DLM	408
7c3f828b CH	409	int blk_alloc_ext_minor(void);
7c3f828b CH	410	void blk_free_ext_minor(unsigned int minor);
581e2600 CH	411	#define ADDPART_FLAG_NONE 0
	412	#define ADDPART_FLAG_RAID 1
	413	#define ADDPART_FLAG_WHOLEDISK 2
7f6be376 CH	414	int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
7f6be376 CH	415	sector_t length);
926fbb16	416	int bdev_del_partition(struct gendisk *disk, int partno);
3d2e7989 CH	417	int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start,
3d2e7989 CH	418	sector_t length);
e7243285	419	void blk_drop_partitions(struct gendisk *disk);
581e2600	420
6f8191fd CH	421	struct gendisk __alloc_disk_node(struct request_queue q, int node_id,
	422	struct lock_class_key *lkclass);
	423
e4581105	424	int bio_add_hw_page(struct request_queue q, struct bio bio,
130879f1	425	struct page *page, unsigned int len, unsigned int offset,
e4581105	426	unsigned int max_sectors, bool *same_page);
130879f1	427
80bd4a7a	428	struct request_queue *blk_alloc_queue(int node_id);
704b914f	429
36369f46	430	int disk_scan_partitions(struct gendisk disk, fmode_t mode, void owner);
da7ba729	431
92e7755e	432	int disk_alloc_events(struct gendisk *disk);
d5870edf CH	433	void disk_add_events(struct gendisk *disk);
	434	void disk_del_events(struct gendisk *disk);
	435	void disk_release_events(struct gendisk *disk);
926597ff CH	436	void disk_block_events(struct gendisk *disk);
	437	void disk_unblock_events(struct gendisk *disk);
	438	void disk_flush_events(struct gendisk *disk, unsigned int mask);
2bc8cda5 CH	439	extern struct device_attribute dev_attr_events;
	440	extern struct device_attribute dev_attr_events_async;
	441	extern struct device_attribute dev_attr_events_poll_msecs;
d5870edf	442
cc5c516d CH	443	extern struct attribute_group blk_trace_attr_group;
cc5c516d CH	444
8a709512	445	long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
84b8514b CH	446	long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);
84b8514b CH	447
cd82cca7 CH	448	extern const struct address_space_operations def_blk_aops;
cd82cca7 CH	449
22d0c408	450	int disk_register_independent_access_ranges(struct gendisk *disk);
a2247f19 DLM	451	void disk_unregister_independent_access_ranges(struct gendisk *disk);
a2247f19 DLM	452
06c8c691 CH	453	#ifdef CONFIG_FAIL_MAKE_REQUEST
	454	bool should_fail_request(struct block_device *part, unsigned int bytes);
	455	#else /* CONFIG_FAIL_MAKE_REQUEST */
	456	static inline bool should_fail_request(struct block_device *part,
	457	unsigned int bytes)
	458	{
	459	return false;
	460	}
	461	#endif /* CONFIG_FAIL_MAKE_REQUEST */
	462
0a467d0f JA	463	/*
	464	* Optimized request reference counting. Ideally we'd make timeouts be more
	465	* clever, as that's the only reason we need references at all... But until
	466	* this happens, this is faster than using refcount_t. Also see:
	467	*
	468	* abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count")
	469	*/
	470	#define req_ref_zero_or_close_to_overflow(req) \
	471	((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u)
	472
	473	static inline bool req_ref_inc_not_zero(struct request *req)
	474	{
	475	return atomic_inc_not_zero(&req->ref);
	476	}
	477
	478	static inline bool req_ref_put_and_test(struct request *req)
	479	{
	480	WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req));
	481	return atomic_dec_and_test(&req->ref);
	482	}
	483
	484	static inline void req_ref_set(struct request *req, int value)
	485	{
	486	atomic_set(&req->ref, value);
	487	}
	488
	489	static inline int req_ref_read(struct request *req)
	490	{
	491	return atomic_read(&req->ref);
	492	}
	493
bc9fcbf9	494	#endif /* BLK_INTERNAL_H */