[mirror_ubuntu-eoan-kernel.git] / include / linux / blk_types.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Block data types and constants.  Directly include this file only to
 * break include dependency loop.
 */
#ifndef __LINUX_BLK_TYPES_H
#define __LINUX_BLK_TYPES_H

#include <linux/types.h>
#include <linux/bvec.h>
#include <linux/ktime.h>

struct bio_set;
struct bio;
struct bio_integrity_payload;
struct page;
struct block_device;
struct io_context;
struct cgroup_subsys_state;
typedef void (bio_end_io_t) (struct bio *);

/*
 * Block error status values.  See block/blk-core:blk_errors for the details.
 * Alpha cannot write a byte atomically, so we need to use 32-bit value.
 */
#if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__)
typedef u32 __bitwise blk_status_t;
#else
typedef u8 __bitwise blk_status_t;
#endif
#define	BLK_STS_OK 0
#define BLK_STS_NOTSUPP		((__force blk_status_t)1)
#define BLK_STS_TIMEOUT		((__force blk_status_t)2)
#define BLK_STS_NOSPC		((__force blk_status_t)3)
#define BLK_STS_TRANSPORT	((__force blk_status_t)4)
#define BLK_STS_TARGET		((__force blk_status_t)5)
#define BLK_STS_NEXUS		((__force blk_status_t)6)
#define BLK_STS_MEDIUM		((__force blk_status_t)7)
#define BLK_STS_PROTECTION	((__force blk_status_t)8)
#define BLK_STS_RESOURCE	((__force blk_status_t)9)
#define BLK_STS_IOERR		((__force blk_status_t)10)

/* hack for device mapper, don't use elsewhere: */
#define BLK_STS_DM_REQUEUE    ((__force blk_status_t)11)

#define BLK_STS_AGAIN		((__force blk_status_t)12)

/*
 * BLK_STS_DEV_RESOURCE is returned from the driver to the block layer if
 * device related resources are unavailable, but the driver can guarantee
 * that the queue will be rerun in the future once resources become
 * available again. This is typically the case for device specific
 * resources that are consumed for IO. If the driver fails allocating these
 * resources, we know that inflight (or pending) IO will free these
 * resource upon completion.
 *
 * This is different from BLK_STS_RESOURCE in that it explicitly references
 * a device specific resource. For resources of wider scope, allocation
 * failure can happen without having pending IO. This means that we can't
 * rely on request completions freeing these resources, as IO may not be in
 * flight. Examples of that are kernel memory allocations, DMA mappings, or
 * any other system wide resources.
 */
#define BLK_STS_DEV_RESOURCE	((__force blk_status_t)13)

/**
 * blk_path_error - returns true if error may be path related
 * @error: status the request was completed with
 *
 * Description:
 *     This classifies block error status into non-retryable errors and ones
 *     that may be successful if retried on a failover path.
 *
 * Return:
 *     %false - retrying failover path will not help
 *     %true  - may succeed if retried
 */
static inline bool blk_path_error(blk_status_t error)
{
	switch (error) {
	case BLK_STS_NOTSUPP:
	case BLK_STS_NOSPC:
	case BLK_STS_TARGET:
	case BLK_STS_NEXUS:
	case BLK_STS_MEDIUM:
	case BLK_STS_PROTECTION:
		return false;
	}

	/* Anything else could be a path failure, so should be retried */
	return true;
}

/*
 * From most significant bit:
 * 1 bit: reserved for other usage, see below
 * 12 bits: original size of bio
 * 51 bits: issue time of bio
 */
#define BIO_ISSUE_RES_BITS      1
#define BIO_ISSUE_SIZE_BITS     12
#define BIO_ISSUE_RES_SHIFT     (64 - BIO_ISSUE_RES_BITS)
#define BIO_ISSUE_SIZE_SHIFT    (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
#define BIO_ISSUE_TIME_MASK     ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1)
#define BIO_ISSUE_SIZE_MASK     \
	(((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
#define BIO_ISSUE_RES_MASK      (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))

/* Reserved bit for blk-throtl */
#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63)

struct bio_issue {
	u64 value;
};

static inline u64 __bio_issue_time(u64 time)
{
	return time & BIO_ISSUE_TIME_MASK;
}

static inline u64 bio_issue_time(struct bio_issue *issue)
{
	return __bio_issue_time(issue->value);
}

static inline sector_t bio_issue_size(struct bio_issue *issue)
{
	return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT);
}

static inline void bio_issue_init(struct bio_issue *issue,
				       sector_t size)
{
	size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;
	issue->value = ((issue->value & BIO_ISSUE_RES_MASK) |
			(ktime_get_ns() & BIO_ISSUE_TIME_MASK) |
			((u64)size << BIO_ISSUE_SIZE_SHIFT));
}

/*
 * main unit of I/O for the block layer and lower layers (ie drivers and
 * stacking drivers)
 */
struct bio {
	struct bio		*bi_next;	/* request queue link */
	struct gendisk		*bi_disk;
	unsigned int		bi_opf;		/* bottom bits req flags,
						 * top bits REQ_OP. Use
						 * accessors.
						 */
	unsigned short		bi_flags;	/* status, etc and bvec pool number */
	unsigned short		bi_ioprio;
	unsigned short		bi_write_hint;
	blk_status_t		bi_status;
	u8			bi_partno;

	/* Number of segments in this BIO after
	 * physical address coalescing is performed.
	 */
	unsigned int		bi_phys_segments;

	/*
	 * To keep track of the max segment size, we account for the
	 * sizes of the first and last mergeable segments in this bio.
	 */
	unsigned int		bi_seg_front_size;
	unsigned int		bi_seg_back_size;

	struct bvec_iter	bi_iter;

	atomic_t		__bi_remaining;
	bio_end_io_t		*bi_end_io;

	void			*bi_private;
#ifdef CONFIG_BLK_CGROUP
	/*
	 * Optional ioc and css associated with this bio.  Put on bio
	 * release.  Read comment on top of bio_associate_current().
	 */
	struct io_context	*bi_ioc;
	struct cgroup_subsys_state *bi_css;
	struct blkcg_gq		*bi_blkg;
	struct bio_issue	bi_issue;
#endif
	union {
#if defined(CONFIG_BLK_DEV_INTEGRITY)
		struct bio_integrity_payload *bi_integrity; /* data integrity */
#endif
	};

	unsigned short		bi_vcnt;	/* how many bio_vec's */

	/*
	 * Everything starting with bi_max_vecs will be preserved by bio_reset()
	 */

	unsigned short		bi_max_vecs;	/* max bvl_vecs we can hold */

	atomic_t		__bi_cnt;	/* pin count */

	struct bio_vec		*bi_io_vec;	/* the actual vec list */

	struct bio_set		*bi_pool;

	/*
	 * We can inline a number of vecs at the end of the bio, to avoid
	 * double allocations for a small number of bio_vecs. This member
	 * MUST obviously be kept at the very end of the bio.
	 */
	struct bio_vec		bi_inline_vecs[0];
};

#define BIO_RESET_BYTES		offsetof(struct bio, bi_max_vecs)

/*
 * bio flags
 */
#define BIO_SEG_VALID	1	/* bi_phys_segments valid */
#define BIO_CLONED	2	/* doesn't own data */
#define BIO_BOUNCED	3	/* bio is a bounce bio */
#define BIO_USER_MAPPED 4	/* contains user pages */
#define BIO_NULL_MAPPED 5	/* contains invalid user pages */
#define BIO_QUIET	6	/* Make BIO Quiet */
#define BIO_CHAIN	7	/* chained bio, ->bi_remaining in effect */
#define BIO_REFFED	8	/* bio has elevated ->bi_cnt */
#define BIO_THROTTLED	9	/* This bio has already been subjected to
				 * throttling rules. Don't do it again. */
#define BIO_TRACE_COMPLETION 10	/* bio_endio() should trace the final completion
				 * of this bio. */
#define BIO_QUEUE_ENTERED 11	/* can use blk_queue_enter_live() */

/* See BVEC_POOL_OFFSET below before adding new flags */

/*
 * We support 6 different bvec pools, the last one is magic in that it
 * is backed by a mempool.
 */
#define BVEC_POOL_NR		6
#define BVEC_POOL_MAX		(BVEC_POOL_NR - 1)

/*
 * Top 3 bits of bio flags indicate the pool the bvecs came from.  We add
 * 1 to the actual index so that 0 indicates that there are no bvecs to be
 * freed.
 */
#define BVEC_POOL_BITS		(3)
#define BVEC_POOL_OFFSET	(16 - BVEC_POOL_BITS)
#define BVEC_POOL_IDX(bio)	((bio)->bi_flags >> BVEC_POOL_OFFSET)
#if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1)
# error "BVEC_POOL_BITS is too small"
#endif

/*
 * Flags starting here get preserved by bio_reset() - this includes
 * only BVEC_POOL_IDX()
 */
#define BIO_RESET_BITS	BVEC_POOL_OFFSET

typedef __u32 __bitwise blk_mq_req_flags_t;

/*
 * Operations and flags common to the bio and request structures.
 * We use 8 bits for encoding the operation, and the remaining 24 for flags.
 *
 * The least significant bit of the operation number indicates the data
 * transfer direction:
 *
 *   - if the least significant bit is set transfers are TO the device
 *   - if the least significant bit is not set transfers are FROM the device
 *
 * If a operation does not transfer data the least significant bit has no
 * meaning.
 */
#define REQ_OP_BITS	8
#define REQ_OP_MASK	((1 << REQ_OP_BITS) - 1)
#define REQ_FLAG_BITS	24

enum req_opf {
	/* read sectors from the device */
	REQ_OP_READ		= 0,
	/* write sectors to the device */
	REQ_OP_WRITE		= 1,
	/* flush the volatile write cache */
	REQ_OP_FLUSH		= 2,
	/* discard sectors */
	REQ_OP_DISCARD		= 3,
	/* securely erase sectors */
	REQ_OP_SECURE_ERASE	= 5,
	/* seset a zone write pointer */
	REQ_OP_ZONE_RESET	= 6,
	/* write the same sector many times */
	REQ_OP_WRITE_SAME	= 7,
	/* write the zero filled sector many times */
	REQ_OP_WRITE_ZEROES	= 9,

	/* SCSI passthrough using struct scsi_request */
	REQ_OP_SCSI_IN		= 32,
	REQ_OP_SCSI_OUT		= 33,
	/* Driver private requests */
	REQ_OP_DRV_IN		= 34,
	REQ_OP_DRV_OUT		= 35,

	REQ_OP_LAST,
};

enum req_flag_bits {
	__REQ_FAILFAST_DEV =	/* no driver retries of device errors */
		REQ_OP_BITS,
	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
	__REQ_FAILFAST_DRIVER,	/* no driver retries of driver errors */
	__REQ_SYNC,		/* request is sync (sync write or read) */
	__REQ_META,		/* metadata io request */
	__REQ_PRIO,		/* boost priority in cfq */
	__REQ_NOMERGE,		/* don't touch this for merging */
	__REQ_IDLE,		/* anticipate more IO after this one */
	__REQ_INTEGRITY,	/* I/O includes block integrity payload */
	__REQ_FUA,		/* forced unit access */
	__REQ_PREFLUSH,		/* request for cache flush */
	__REQ_RAHEAD,		/* read ahead, can fail anytime */
	__REQ_BACKGROUND,	/* background IO */
	__REQ_NOWAIT,           /* Don't wait if request will block */

	/* command specific flags for REQ_OP_WRITE_ZEROES: */
	__REQ_NOUNMAP,		/* do not free blocks when zeroing */

	/* for driver use */
	__REQ_DRV,
	__REQ_SWAP,		/* swapping request. */
	__REQ_NR_BITS,		/* stops here */
};

#define REQ_FAILFAST_DEV	(1ULL << __REQ_FAILFAST_DEV)
#define REQ_FAILFAST_TRANSPORT	(1ULL << __REQ_FAILFAST_TRANSPORT)
#define REQ_FAILFAST_DRIVER	(1ULL << __REQ_FAILFAST_DRIVER)
#define REQ_SYNC		(1ULL << __REQ_SYNC)
#define REQ_META		(1ULL << __REQ_META)
#define REQ_PRIO		(1ULL << __REQ_PRIO)
#define REQ_NOMERGE		(1ULL << __REQ_NOMERGE)
#define REQ_IDLE		(1ULL << __REQ_IDLE)
#define REQ_INTEGRITY		(1ULL << __REQ_INTEGRITY)
#define REQ_FUA			(1ULL << __REQ_FUA)
#define REQ_PREFLUSH		(1ULL << __REQ_PREFLUSH)
#define REQ_RAHEAD		(1ULL << __REQ_RAHEAD)
#define REQ_BACKGROUND		(1ULL << __REQ_BACKGROUND)
#define REQ_NOWAIT		(1ULL << __REQ_NOWAIT)

#define REQ_NOUNMAP		(1ULL << __REQ_NOUNMAP)

#define REQ_DRV			(1ULL << __REQ_DRV)
#define REQ_SWAP		(1ULL << __REQ_SWAP)

#define REQ_FAILFAST_MASK \
	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)

#define REQ_NOMERGE_FLAGS \
	(REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)

enum stat_group {
	STAT_READ,
	STAT_WRITE,
	STAT_DISCARD,

	NR_STAT_GROUPS
};

#define bio_op(bio) \
	((bio)->bi_opf & REQ_OP_MASK)
#define req_op(req) \
	((req)->cmd_flags & REQ_OP_MASK)

/* obsolete, don't use in new code */
static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
		unsigned op_flags)
{
	bio->bi_opf = op | op_flags;
}

static inline bool op_is_write(unsigned int op)
{
	return (op & 1);
}

/*
 * Check if the bio or request is one that needs special treatment in the
 * flush state machine.
 */
static inline bool op_is_flush(unsigned int op)
{
	return op & (REQ_FUA | REQ_PREFLUSH);
}

/*
 * Reads are always treated as synchronous, as are requests with the FUA or
 * PREFLUSH flag.  Other operations may be marked as synchronous using the
 * REQ_SYNC flag.
 */
static inline bool op_is_sync(unsigned int op)
{
	return (op & REQ_OP_MASK) == REQ_OP_READ ||
		(op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
}

static inline bool op_is_discard(unsigned int op)
{
	return (op & REQ_OP_MASK) == REQ_OP_DISCARD;
}

static inline int op_stat_group(unsigned int op)
{
	if (op_is_discard(op))
		return STAT_DISCARD;
	return op_is_write(op);
}

typedef unsigned int blk_qc_t;
#define BLK_QC_T_NONE		-1U
#define BLK_QC_T_SHIFT		16
#define BLK_QC_T_INTERNAL	(1U << 31)

static inline bool blk_qc_t_valid(blk_qc_t cookie)
{
	return cookie != BLK_QC_T_NONE;
}

static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num,
				       bool internal)
{
	blk_qc_t ret = tag | (queue_num << BLK_QC_T_SHIFT);

	if (internal)
		ret |= BLK_QC_T_INTERNAL;

	return ret;
}

static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
{
	return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT;
}

static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
{
	return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
}

static inline bool blk_qc_t_is_internal(blk_qc_t cookie)
{
	return (cookie & BLK_QC_T_INTERNAL) != 0;
}

struct blk_rq_stat {
	u64 mean;
	u64 min;
	u64 max;
	u32 nr_samples;
	u64 batch;
};

#endif /* __LINUX_BLK_TYPES_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
7cc01581 TH	2	/*
	3	* Block data types and constants. Directly include this file only to
	4	* break include dependency loop.
	5	*/
	6	#ifndef __LINUX_BLK_TYPES_H
	7	#define __LINUX_BLK_TYPES_H
	8
7cc01581	9	#include <linux/types.h>
0781e79e	10	#include <linux/bvec.h>
5238dcf4	11	#include <linux/ktime.h>
7cc01581 TH	12
	13	struct bio_set;
	14	struct bio;
	15	struct bio_integrity_payload;
	16	struct page;
	17	struct block_device;
852c788f TH	18	struct io_context;
852c788f TH	19	struct cgroup_subsys_state;
4246a0b6	20	typedef void (bio_end_io_t) (struct bio *);
7cc01581	21
2a842aca CH	22	/*
2a842aca CH	23	* Block error status values. See block/blk-core:blk_errors for the details.
6e2fb221	24	* Alpha cannot write a byte atomically, so we need to use 32-bit value.
2a842aca	25	*/
6e2fb221 MP	26	#if defined(CONFIG_ALPHA) && !defined(__alpha_bwx__)
	27	typedef u32 __bitwise blk_status_t;
	28	#else
2a842aca	29	typedef u8 __bitwise blk_status_t;
6e2fb221	30	#endif
2a842aca CH	31	#define BLK_STS_OK 0
	32	#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
	33	#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
	34	#define BLK_STS_NOSPC ((__force blk_status_t)3)
	35	#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
	36	#define BLK_STS_TARGET ((__force blk_status_t)5)
	37	#define BLK_STS_NEXUS ((__force blk_status_t)6)
	38	#define BLK_STS_MEDIUM ((__force blk_status_t)7)
	39	#define BLK_STS_PROTECTION ((__force blk_status_t)8)
	40	#define BLK_STS_RESOURCE ((__force blk_status_t)9)
	41	#define BLK_STS_IOERR ((__force blk_status_t)10)
	42
4e4cbee9 CH	43	/* hack for device mapper, don't use elsewhere: */
	44	#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
	45
03a07c92 GR	46	#define BLK_STS_AGAIN ((__force blk_status_t)12)
03a07c92 GR	47
86ff7c2a ML	48	/*
	49	* BLK_STS_DEV_RESOURCE is returned from the driver to the block layer if
	50	* device related resources are unavailable, but the driver can guarantee
	51	* that the queue will be rerun in the future once resources become
	52	* available again. This is typically the case for device specific
	53	* resources that are consumed for IO. If the driver fails allocating these
	54	* resources, we know that inflight (or pending) IO will free these
	55	* resource upon completion.
	56	*
	57	* This is different from BLK_STS_RESOURCE in that it explicitly references
	58	* a device specific resource. For resources of wider scope, allocation
	59	* failure can happen without having pending IO. This means that we can't
	60	* rely on request completions freeing these resources, as IO may not be in
	61	* flight. Examples of that are kernel memory allocations, DMA mappings, or
	62	* any other system wide resources.
	63	*/
	64	#define BLK_STS_DEV_RESOURCE ((__force blk_status_t)13)
	65
9111e568 KB	66	/**
	67	* blk_path_error - returns true if error may be path related
	68	* @error: status the request was completed with
	69	*
	70	* Description:
	71	* This classifies block error status into non-retryable errors and ones
	72	* that may be successful if retried on a failover path.
	73	*
	74	* Return:
	75	* %false - retrying failover path will not help
	76	* %true - may succeed if retried
	77	*/
	78	static inline bool blk_path_error(blk_status_t error)
	79	{
	80	switch (error) {
	81	case BLK_STS_NOTSUPP:
	82	case BLK_STS_NOSPC:
	83	case BLK_STS_TARGET:
	84	case BLK_STS_NEXUS:
	85	case BLK_STS_MEDIUM:
	86	case BLK_STS_PROTECTION:
	87	return false;
	88	}
	89
	90	/* Anything else could be a path failure, so should be retried */
	91	return true;
	92	}
	93
5238dcf4 OS	94	/*
	95	* From most significant bit:
	96	* 1 bit: reserved for other usage, see below
	97	* 12 bits: original size of bio
	98	* 51 bits: issue time of bio
	99	*/
	100	#define BIO_ISSUE_RES_BITS 1
	101	#define BIO_ISSUE_SIZE_BITS 12
	102	#define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS)
	103	#define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS)
	104	#define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1)
	105	#define BIO_ISSUE_SIZE_MASK \
	106	(((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT)
	107	#define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1))
	108
	109	/* Reserved bit for blk-throtl */
	110	#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63)
	111
	112	struct bio_issue {
	113	u64 value;
	114	};
	115
	116	static inline u64 __bio_issue_time(u64 time)
	117	{
	118	return time & BIO_ISSUE_TIME_MASK;
	119	}
	120
	121	static inline u64 bio_issue_time(struct bio_issue *issue)
	122	{
	123	return __bio_issue_time(issue->value);
	124	}
	125
	126	static inline sector_t bio_issue_size(struct bio_issue *issue)
	127	{
	128	return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT);
	129	}
	130
	131	static inline void bio_issue_init(struct bio_issue *issue,
	132	sector_t size)
	133	{
	134	size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1;
	135	issue->value = ((issue->value & BIO_ISSUE_RES_MASK) \|
	136	(ktime_get_ns() & BIO_ISSUE_TIME_MASK) \|
	137	((u64)size << BIO_ISSUE_SIZE_SHIFT));
	138	}
	139
7cc01581 TH	140	/*
	141	* main unit of I/O for the block layer and lower layers (ie drivers and
	142	* stacking drivers)
	143	*/
	144	struct bio {
7cc01581	145	struct bio bi_next; / request queue link */
74d46992	146	struct gendisk *bi_disk;
1eff9d32 JA	147	unsigned int bi_opf; /* bottom bits req flags,
	148	* top bits REQ_OP. Use
	149	* accessors.
4e1b2d52	150	*/
dbde775c	151	unsigned short bi_flags; /* status, etc and bvec pool number */
43b62ce3	152	unsigned short bi_ioprio;
cb6934f8	153	unsigned short bi_write_hint;
111be883 SL	154	blk_status_t bi_status;
111be883 SL	155	u8 bi_partno;
7cc01581 TH	156
	157	/* Number of segments in this BIO after
	158	* physical address coalescing is performed.
	159	*/
	160	unsigned int bi_phys_segments;
	161
7cc01581 TH	162	/*
	163	* To keep track of the max segment size, we account for the
	164	* sizes of the first and last mergeable segments in this bio.
	165	*/
	166	unsigned int bi_seg_front_size;
	167	unsigned int bi_seg_back_size;
	168
111be883	169	struct bvec_iter bi_iter;
196d38bc	170
111be883	171	atomic_t __bi_remaining;
7cc01581 TH	172	bio_end_io_t *bi_end_io;
	173
	174	void *bi_private;
852c788f TH	175	#ifdef CONFIG_BLK_CGROUP
	176	/*
	177	* Optional ioc and css associated with this bio. Put on bio
	178	* release. Read comment on top of bio_associate_current().
	179	*/
	180	struct io_context *bi_ioc;
b5f2954d	181	struct cgroup_subsys_state *bi_css;
08e18eab	182	struct blkcg_gq *bi_blkg;
5238dcf4	183	struct bio_issue bi_issue;
852c788f	184	#endif
180b2f95	185	union {
7cc01581	186	#if defined(CONFIG_BLK_DEV_INTEGRITY)
180b2f95	187	struct bio_integrity_payload bi_integrity; / data integrity */
7cc01581	188	#endif
180b2f95	189	};
7cc01581	190
4f024f37 KO	191	unsigned short bi_vcnt; /* how many bio_vec's */
4f024f37 KO	192
f44b48c7 KO	193	/*
	194	* Everything starting with bi_max_vecs will be preserved by bio_reset()
	195	*/
	196
4f024f37	197	unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
f44b48c7	198
dac56212	199	atomic_t __bi_cnt; /* pin count */
f44b48c7 KO	200
	201	struct bio_vec bi_io_vec; / the actual vec list */
	202
395c72a7 KO	203	struct bio_set *bi_pool;
395c72a7 KO	204
7cc01581 TH	205	/*
	206	* We can inline a number of vecs at the end of the bio, to avoid
	207	* double allocations for a small number of bio_vecs. This member
	208	* MUST obviously be kept at the very end of the bio.
	209	*/
	210	struct bio_vec bi_inline_vecs[0];
	211	};
	212
f44b48c7 KO	213	#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
f44b48c7 KO	214
7cc01581 TH	215	/*
	216	* bio flags
	217	*/
b2dbe0a6 JA	218	#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
	219	#define BIO_CLONED 2 /* doesn't own data */
	220	#define BIO_BOUNCED 3 /* bio is a bounce bio */
	221	#define BIO_USER_MAPPED 4 /* contains user pages */
	222	#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
	223	#define BIO_QUIET 6 /* Make BIO Quiet */
a3ad0a9d JK	224	#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
a3ad0a9d JK	225	#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
8d2bbd4c CH	226	#define BIO_THROTTLED 9 /* This bio has already been subjected to
8d2bbd4c CH	227	* throttling rules. Don't do it again. */
fbbaf700 N	228	#define BIO_TRACE_COMPLETION 10 /* bio_endio() should trace the final completion
fbbaf700 N	229	* of this bio. */
cd4a4ae4 JA	230	#define BIO_QUEUE_ENTERED 11 /* can use blk_queue_enter_live() */
cd4a4ae4 JA	231
dbde775c	232	/* See BVEC_POOL_OFFSET below before adding new flags */
f44b48c7	233
7cc01581	234	/*
ed996a52 CH	235	* We support 6 different bvec pools, the last one is magic in that it
ed996a52 CH	236	* is backed by a mempool.
7cc01581	237	*/
ed996a52 CH	238	#define BVEC_POOL_NR 6
	239	#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
	240
	241	/*
dbde775c	242	* Top 3 bits of bio flags indicate the pool the bvecs came from. We add
ed996a52 CH	243	* 1 to the actual index so that 0 indicates that there are no bvecs to be
	244	* freed.
	245	*/
dbde775c	246	#define BVEC_POOL_BITS (3)
c0acf12a	247	#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
ed996a52	248	#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
dbde775c N	249	#if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1)
	250	# error "BVEC_POOL_BITS is too small"
	251	#endif
	252
	253	/*
	254	* Flags starting here get preserved by bio_reset() - this includes
	255	* only BVEC_POOL_IDX()
	256	*/
	257	#define BIO_RESET_BITS BVEC_POOL_OFFSET
7cc01581	258
9a95e4ef BVA	259	typedef __u32 __bitwise blk_mq_req_flags_t;
9a95e4ef BVA	260
7cc01581	261	/*
ef295ecf CH	262	* Operations and flags common to the bio and request structures.
ef295ecf CH	263	* We use 8 bits for encoding the operation, and the remaining 24 for flags.
87374179 CH	264	*
	265	* The least significant bit of the operation number indicates the data
	266	* transfer direction:
	267	*
	268	* - if the least significant bit is set transfers are TO the device
	269	* - if the least significant bit is not set transfers are FROM the device
	270	*
	271	* If a operation does not transfer data the least significant bit has no
	272	* meaning.
7cc01581	273	*/
ef295ecf CH	274	#define REQ_OP_BITS 8
	275	#define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1)
	276	#define REQ_FLAG_BITS 24
	277
	278	enum req_opf {
87374179 CH	279	/* read sectors from the device */
	280	REQ_OP_READ = 0,
	281	/* write sectors to the device */
	282	REQ_OP_WRITE = 1,
	283	/* flush the volatile write cache */
	284	REQ_OP_FLUSH = 2,
	285	/* discard sectors */
	286	REQ_OP_DISCARD = 3,
87374179 CH	287	/* securely erase sectors */
	288	REQ_OP_SECURE_ERASE = 5,
	289	/* seset a zone write pointer */
	290	REQ_OP_ZONE_RESET = 6,
	291	/* write the same sector many times */
	292	REQ_OP_WRITE_SAME = 7,
a6f0788e	293	/* write the zero filled sector many times */
1d62ac13	294	REQ_OP_WRITE_ZEROES = 9,
ef295ecf	295
aebf526b CH	296	/* SCSI passthrough using struct scsi_request */
	297	REQ_OP_SCSI_IN = 32,
	298	REQ_OP_SCSI_OUT = 33,
	299	/* Driver private requests */
	300	REQ_OP_DRV_IN = 34,
	301	REQ_OP_DRV_OUT = 35,
	302
ef295ecf CH	303	REQ_OP_LAST,
	304	};
	305
	306	enum req_flag_bits {
	307	__REQ_FAILFAST_DEV = /* no driver retries of device errors */
	308	REQ_OP_BITS,
7cc01581 TH	309	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
7cc01581 TH	310	__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
7cc01581 TH	311	__REQ_SYNC, /* request is sync (sync write or read) */
7cc01581 TH	312	__REQ_META, /* metadata io request */
65299a3b	313	__REQ_PRIO, /* boost priority in cfq */
bd1c1c21	314	__REQ_NOMERGE, /* don't touch this for merging */
a2b80967	315	__REQ_IDLE, /* anticipate more IO after this one */
180b2f95	316	__REQ_INTEGRITY, /* I/O includes block integrity payload */
8e4bf844	317	__REQ_FUA, /* forced unit access */
28a8f0d3	318	__REQ_PREFLUSH, /* request for cache flush */
188bd2b1	319	__REQ_RAHEAD, /* read ahead, can fail anytime */
1d796d6a	320	__REQ_BACKGROUND, /* background IO */
8977f563	321	__REQ_NOWAIT, /* Don't wait if request will block */
d928be9f CH	322
	323	/* command specific flags for REQ_OP_WRITE_ZEROES: */
	324	__REQ_NOUNMAP, /* do not free blocks when zeroing */
	325
96222bcc CH	326	/* for driver use */
96222bcc CH	327	__REQ_DRV,
0d1e0c7c	328	__REQ_SWAP, /* swapping request. */
7cc01581 TH	329	__REQ_NR_BITS, /* stops here */
	330	};
	331
5953316d JA	332	#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
	333	#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
	334	#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
	335	#define REQ_SYNC (1ULL << __REQ_SYNC)
	336	#define REQ_META (1ULL << __REQ_META)
	337	#define REQ_PRIO (1ULL << __REQ_PRIO)
ef295ecf	338	#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
a2b80967	339	#define REQ_IDLE (1ULL << __REQ_IDLE)
180b2f95	340	#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
ef295ecf CH	341	#define REQ_FUA (1ULL << __REQ_FUA)
	342	#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
	343	#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
1d796d6a	344	#define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND)
8977f563	345	#define REQ_NOWAIT (1ULL << __REQ_NOWAIT)
7cc01581	346
d928be9f CH	347	#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
d928be9f CH	348
96222bcc	349	#define REQ_DRV (1ULL << __REQ_DRV)
0d1e0c7c	350	#define REQ_SWAP (1ULL << __REQ_SWAP)
d928be9f	351
7cc01581 TH	352	#define REQ_FAILFAST_MASK \
7cc01581 TH	353	(REQ_FAILFAST_DEV \| REQ_FAILFAST_TRANSPORT \| REQ_FAILFAST_DRIVER)
7cc01581	354
e2a60da7	355	#define REQ_NOMERGE_FLAGS \
e8064021	356	(REQ_NOMERGE \| REQ_PREFLUSH \| REQ_FUA)
e2a60da7	357
dbae2c55 MC	358	enum stat_group {
	359	STAT_READ,
	360	STAT_WRITE,
bdca3c87	361	STAT_DISCARD,
dbae2c55 MC	362
	363	NR_STAT_GROUPS
	364	};
	365
ef295ecf CH	366	#define bio_op(bio) \
	367	((bio)->bi_opf & REQ_OP_MASK)
	368	#define req_op(req) \
	369	((req)->cmd_flags & REQ_OP_MASK)
7cc01581	370
ef295ecf	371	/* obsolete, don't use in new code */
93c5bdf7 CH	372	static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
	373	unsigned op_flags)
	374	{
	375	bio->bi_opf = op \| op_flags;
	376	}
c11f0c0b	377
87374179 CH	378	static inline bool op_is_write(unsigned int op)
	379	{
	380	return (op & 1);
	381	}
	382
f73f44eb CH	383	/*
	384	* Check if the bio or request is one that needs special treatment in the
	385	* flush state machine.
	386	*/
	387	static inline bool op_is_flush(unsigned int op)
	388	{
	389	return op & (REQ_FUA \| REQ_PREFLUSH);
	390	}
	391
b685d3d6 CH	392	/*
	393	* Reads are always treated as synchronous, as are requests with the FUA or
	394	* PREFLUSH flag. Other operations may be marked as synchronous using the
	395	* REQ_SYNC flag.
	396	*/
ef295ecf CH	397	static inline bool op_is_sync(unsigned int op)
ef295ecf CH	398	{
b685d3d6 CH	399	return (op & REQ_OP_MASK) == REQ_OP_READ \|\|
b685d3d6 CH	400	(op & (REQ_SYNC \| REQ_FUA \| REQ_PREFLUSH));
ef295ecf	401	}
c11f0c0b	402
bdca3c87 MC	403	static inline bool op_is_discard(unsigned int op)
	404	{
	405	return (op & REQ_OP_MASK) == REQ_OP_DISCARD;
	406	}
	407
ddcf35d3 MC	408	static inline int op_stat_group(unsigned int op)
ddcf35d3 MC	409	{
bdca3c87 MC	410	if (op_is_discard(op))
bdca3c87 MC	411	return STAT_DISCARD;
ddcf35d3 MC	412	return op_is_write(op);
	413	}
	414
dece1635	415	typedef unsigned int blk_qc_t;
fd2d3326 JA	416	#define BLK_QC_T_NONE -1U
	417	#define BLK_QC_T_SHIFT 16
	418	#define BLK_QC_T_INTERNAL (1U << 31)
dece1635 JA	419
	420	static inline bool blk_qc_t_valid(blk_qc_t cookie)
	421	{
	422	return cookie != BLK_QC_T_NONE;
	423	}
	424
fd2d3326 JA	425	static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num,
fd2d3326 JA	426	bool internal)
dece1635	427	{
fd2d3326 JA	428	blk_qc_t ret = tag \| (queue_num << BLK_QC_T_SHIFT);
	429
	430	if (internal)
	431	ret \|= BLK_QC_T_INTERNAL;
	432
	433	return ret;
dece1635 JA	434	}
	435
	436	static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
	437	{
fd2d3326	438	return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT;
dece1635 JA	439	}
	440
	441	static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
	442	{
e3a7a3bf	443	return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
dece1635 JA	444	}
dece1635 JA	445
fd2d3326 JA	446	static inline bool blk_qc_t_is_internal(blk_qc_t cookie)
	447	{
	448	return (cookie & BLK_QC_T_INTERNAL) != 0;
	449	}
	450
cf43e6be	451	struct blk_rq_stat {
eca8b53a	452	u64 mean;
cf43e6be JA	453	u64 min;
cf43e6be JA	454	u64 max;
eca8b53a	455	u32 nr_samples;
cf43e6be	456	u64 batch;
cf43e6be JA	457	};
cf43e6be JA	458
7cc01581	459	#endif /* __LINUX_BLK_TYPES_H */