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

/*
 * 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>

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.
 */
typedef u8 __bitwise blk_status_t;
#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)

struct blk_issue_stat {
	u64 stat;
};

/*
 * 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 block_device	*bi_bdev;
	blk_status_t		bi_status;
	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;

	struct bvec_iter	bi_iter;

	/* 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;

	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;
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
	void			*bi_cg_private;
	struct blk_issue_stat	bi_issue_stat;
#endif
#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. */
/* 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

/*
 * 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,
	/* get zone information */
	REQ_OP_ZONE_REPORT	= 4,
	/* 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 */

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

	__REQ_NOWAIT,           /* Don't wait if request will block */
	__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_NOUNMAP		(1ULL << __REQ_NOUNMAP)
#define REQ_NOWAIT		(1ULL << __REQ_NOWAIT)

#define REQ_FAILFAST_MASK \
	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)

#define REQ_NOMERGE_FLAGS \
	(REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA)

#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));
}

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 {
	s64 mean;
	u64 min;
	u64 max;
	s32 nr_samples;
	s32 nr_batch;
	u64 batch;
};

#endif /* __LINUX_BLK_TYPES_H */
Commit	Line	Data
7cc01581 TH	1	/*
	2	* Block data types and constants. Directly include this file only to
	3	* break include dependency loop.
	4	*/
	5	#ifndef __LINUX_BLK_TYPES_H
	6	#define __LINUX_BLK_TYPES_H
	7
7cc01581	8	#include <linux/types.h>
0781e79e	9	#include <linux/bvec.h>
7cc01581 TH	10
	11	struct bio_set;
	12	struct bio;
	13	struct bio_integrity_payload;
	14	struct page;
	15	struct block_device;
852c788f TH	16	struct io_context;
852c788f TH	17	struct cgroup_subsys_state;
4246a0b6	18	typedef void (bio_end_io_t) (struct bio *);
7cc01581	19
2a842aca CH	20	/*
	21	* Block error status values. See block/blk-core:blk_errors for the details.
	22	*/
	23	typedef u8 __bitwise blk_status_t;
	24	#define BLK_STS_OK 0
	25	#define BLK_STS_NOTSUPP ((__force blk_status_t)1)
	26	#define BLK_STS_TIMEOUT ((__force blk_status_t)2)
	27	#define BLK_STS_NOSPC ((__force blk_status_t)3)
	28	#define BLK_STS_TRANSPORT ((__force blk_status_t)4)
	29	#define BLK_STS_TARGET ((__force blk_status_t)5)
	30	#define BLK_STS_NEXUS ((__force blk_status_t)6)
	31	#define BLK_STS_MEDIUM ((__force blk_status_t)7)
	32	#define BLK_STS_PROTECTION ((__force blk_status_t)8)
	33	#define BLK_STS_RESOURCE ((__force blk_status_t)9)
	34	#define BLK_STS_IOERR ((__force blk_status_t)10)
	35
4e4cbee9 CH	36	/* hack for device mapper, don't use elsewhere: */
	37	#define BLK_STS_DM_REQUEUE ((__force blk_status_t)11)
	38
03a07c92 GR	39	#define BLK_STS_AGAIN ((__force blk_status_t)12)
03a07c92 GR	40
b9147dd1 SL	41	struct blk_issue_stat {
	42	u64 stat;
	43	};
	44
7cc01581 TH	45	/*
	46	* main unit of I/O for the block layer and lower layers (ie drivers and
	47	* stacking drivers)
	48	*/
	49	struct bio {
7cc01581 TH	50	struct bio bi_next; / request queue link */
7cc01581 TH	51	struct block_device *bi_bdev;
4e4cbee9	52	blk_status_t bi_status;
1eff9d32 JA	53	unsigned int bi_opf; /* bottom bits req flags,
	54	* top bits REQ_OP. Use
	55	* accessors.
4e1b2d52	56	*/
dbde775c	57	unsigned short bi_flags; /* status, etc and bvec pool number */
43b62ce3	58	unsigned short bi_ioprio;
cb6934f8	59	unsigned short bi_write_hint;
7cc01581	60
4f024f37	61	struct bvec_iter bi_iter;
7cc01581 TH	62
	63	/* Number of segments in this BIO after
	64	* physical address coalescing is performed.
	65	*/
	66	unsigned int bi_phys_segments;
	67
7cc01581 TH	68	/*
	69	* To keep track of the max segment size, we account for the
	70	* sizes of the first and last mergeable segments in this bio.
	71	*/
	72	unsigned int bi_seg_front_size;
	73	unsigned int bi_seg_back_size;
	74
c4cf5261	75	atomic_t __bi_remaining;
196d38bc	76
7cc01581 TH	77	bio_end_io_t *bi_end_io;
	78
	79	void *bi_private;
852c788f TH	80	#ifdef CONFIG_BLK_CGROUP
	81	/*
	82	* Optional ioc and css associated with this bio. Put on bio
	83	* release. Read comment on top of bio_associate_current().
	84	*/
	85	struct io_context *bi_ioc;
	86	struct cgroup_subsys_state *bi_css;
9e234eea SL	87	#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
9e234eea SL	88	void *bi_cg_private;
b9147dd1	89	struct blk_issue_stat bi_issue_stat;
9e234eea	90	#endif
852c788f	91	#endif
180b2f95	92	union {
7cc01581	93	#if defined(CONFIG_BLK_DEV_INTEGRITY)
180b2f95	94	struct bio_integrity_payload bi_integrity; / data integrity */
7cc01581	95	#endif
180b2f95	96	};
7cc01581	97
4f024f37 KO	98	unsigned short bi_vcnt; /* how many bio_vec's */
4f024f37 KO	99
f44b48c7 KO	100	/*
	101	* Everything starting with bi_max_vecs will be preserved by bio_reset()
	102	*/
	103
4f024f37	104	unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
f44b48c7	105
dac56212	106	atomic_t __bi_cnt; /* pin count */
f44b48c7 KO	107
	108	struct bio_vec bi_io_vec; / the actual vec list */
	109
395c72a7 KO	110	struct bio_set *bi_pool;
395c72a7 KO	111
7cc01581 TH	112	/*
	113	* We can inline a number of vecs at the end of the bio, to avoid
	114	* double allocations for a small number of bio_vecs. This member
	115	* MUST obviously be kept at the very end of the bio.
	116	*/
	117	struct bio_vec bi_inline_vecs[0];
	118	};
	119
f44b48c7 KO	120	#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
f44b48c7 KO	121
7cc01581 TH	122	/*
	123	* bio flags
	124	*/
b2dbe0a6 JA	125	#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
	126	#define BIO_CLONED 2 /* doesn't own data */
	127	#define BIO_BOUNCED 3 /* bio is a bounce bio */
	128	#define BIO_USER_MAPPED 4 /* contains user pages */
	129	#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
	130	#define BIO_QUIET 6 /* Make BIO Quiet */
a3ad0a9d JK	131	#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
a3ad0a9d JK	132	#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
8d2bbd4c CH	133	#define BIO_THROTTLED 9 /* This bio has already been subjected to
8d2bbd4c CH	134	* throttling rules. Don't do it again. */
fbbaf700 N	135	#define BIO_TRACE_COMPLETION 10 /* bio_endio() should trace the final completion
fbbaf700 N	136	* of this bio. */
dbde775c	137	/* See BVEC_POOL_OFFSET below before adding new flags */
f44b48c7	138
7cc01581	139	/*
ed996a52 CH	140	* We support 6 different bvec pools, the last one is magic in that it
ed996a52 CH	141	* is backed by a mempool.
7cc01581	142	*/
ed996a52 CH	143	#define BVEC_POOL_NR 6
	144	#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
	145
	146	/*
dbde775c	147	* Top 3 bits of bio flags indicate the pool the bvecs came from. We add
ed996a52 CH	148	* 1 to the actual index so that 0 indicates that there are no bvecs to be
	149	* freed.
	150	*/
dbde775c	151	#define BVEC_POOL_BITS (3)
c0acf12a	152	#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
ed996a52	153	#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
dbde775c N	154	#if (1<< BVEC_POOL_BITS) < (BVEC_POOL_NR+1)
	155	# error "BVEC_POOL_BITS is too small"
	156	#endif
	157
	158	/*
	159	* Flags starting here get preserved by bio_reset() - this includes
	160	* only BVEC_POOL_IDX()
	161	*/
	162	#define BIO_RESET_BITS BVEC_POOL_OFFSET
7cc01581 TH	163
7cc01581 TH	164	/*
ef295ecf CH	165	* Operations and flags common to the bio and request structures.
ef295ecf CH	166	* We use 8 bits for encoding the operation, and the remaining 24 for flags.
87374179 CH	167	*
	168	* The least significant bit of the operation number indicates the data
	169	* transfer direction:
	170	*
	171	* - if the least significant bit is set transfers are TO the device
	172	* - if the least significant bit is not set transfers are FROM the device
	173	*
	174	* If a operation does not transfer data the least significant bit has no
	175	* meaning.
7cc01581	176	*/
ef295ecf CH	177	#define REQ_OP_BITS 8
	178	#define REQ_OP_MASK ((1 << REQ_OP_BITS) - 1)
	179	#define REQ_FLAG_BITS 24
	180
	181	enum req_opf {
87374179 CH	182	/* read sectors from the device */
	183	REQ_OP_READ = 0,
	184	/* write sectors to the device */
	185	REQ_OP_WRITE = 1,
	186	/* flush the volatile write cache */
	187	REQ_OP_FLUSH = 2,
	188	/* discard sectors */
	189	REQ_OP_DISCARD = 3,
	190	/* get zone information */
	191	REQ_OP_ZONE_REPORT = 4,
	192	/* securely erase sectors */
	193	REQ_OP_SECURE_ERASE = 5,
	194	/* seset a zone write pointer */
	195	REQ_OP_ZONE_RESET = 6,
	196	/* write the same sector many times */
	197	REQ_OP_WRITE_SAME = 7,
a6f0788e	198	/* write the zero filled sector many times */
1d62ac13	199	REQ_OP_WRITE_ZEROES = 9,
ef295ecf	200
aebf526b CH	201	/* SCSI passthrough using struct scsi_request */
	202	REQ_OP_SCSI_IN = 32,
	203	REQ_OP_SCSI_OUT = 33,
	204	/* Driver private requests */
	205	REQ_OP_DRV_IN = 34,
	206	REQ_OP_DRV_OUT = 35,
	207
ef295ecf CH	208	REQ_OP_LAST,
	209	};
	210
	211	enum req_flag_bits {
	212	__REQ_FAILFAST_DEV = /* no driver retries of device errors */
	213	REQ_OP_BITS,
7cc01581 TH	214	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
7cc01581 TH	215	__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
7cc01581 TH	216	__REQ_SYNC, /* request is sync (sync write or read) */
7cc01581 TH	217	__REQ_META, /* metadata io request */
65299a3b	218	__REQ_PRIO, /* boost priority in cfq */
bd1c1c21	219	__REQ_NOMERGE, /* don't touch this for merging */
a2b80967	220	__REQ_IDLE, /* anticipate more IO after this one */
180b2f95	221	__REQ_INTEGRITY, /* I/O includes block integrity payload */
8e4bf844	222	__REQ_FUA, /* forced unit access */
28a8f0d3	223	__REQ_PREFLUSH, /* request for cache flush */
188bd2b1	224	__REQ_RAHEAD, /* read ahead, can fail anytime */
1d796d6a	225	__REQ_BACKGROUND, /* background IO */
d928be9f CH	226
	227	/* command specific flags for REQ_OP_WRITE_ZEROES: */
	228	__REQ_NOUNMAP, /* do not free blocks when zeroing */
	229
03a07c92	230	__REQ_NOWAIT, /* Don't wait if request will block */
7cc01581 TH	231	__REQ_NR_BITS, /* stops here */
	232	};
	233
5953316d JA	234	#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
	235	#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
	236	#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
	237	#define REQ_SYNC (1ULL << __REQ_SYNC)
	238	#define REQ_META (1ULL << __REQ_META)
	239	#define REQ_PRIO (1ULL << __REQ_PRIO)
ef295ecf	240	#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
a2b80967	241	#define REQ_IDLE (1ULL << __REQ_IDLE)
180b2f95	242	#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
ef295ecf CH	243	#define REQ_FUA (1ULL << __REQ_FUA)
	244	#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
	245	#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
1d796d6a	246	#define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND)
7cc01581	247
d928be9f	248	#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
03a07c92	249	#define REQ_NOWAIT (1ULL << __REQ_NOWAIT)
d928be9f	250
7cc01581 TH	251	#define REQ_FAILFAST_MASK \
7cc01581 TH	252	(REQ_FAILFAST_DEV \| REQ_FAILFAST_TRANSPORT \| REQ_FAILFAST_DRIVER)
7cc01581	253
e2a60da7	254	#define REQ_NOMERGE_FLAGS \
e8064021	255	(REQ_NOMERGE \| REQ_PREFLUSH \| REQ_FUA)
e2a60da7	256
ef295ecf CH	257	#define bio_op(bio) \
	258	((bio)->bi_opf & REQ_OP_MASK)
	259	#define req_op(req) \
	260	((req)->cmd_flags & REQ_OP_MASK)
7cc01581	261
ef295ecf	262	/* obsolete, don't use in new code */
93c5bdf7 CH	263	static inline void bio_set_op_attrs(struct bio *bio, unsigned op,
	264	unsigned op_flags)
	265	{
	266	bio->bi_opf = op \| op_flags;
	267	}
c11f0c0b	268
87374179 CH	269	static inline bool op_is_write(unsigned int op)
	270	{
	271	return (op & 1);
	272	}
	273
f73f44eb CH	274	/*
	275	* Check if the bio or request is one that needs special treatment in the
	276	* flush state machine.
	277	*/
	278	static inline bool op_is_flush(unsigned int op)
	279	{
	280	return op & (REQ_FUA \| REQ_PREFLUSH);
	281	}
	282
b685d3d6 CH	283	/*
	284	* Reads are always treated as synchronous, as are requests with the FUA or
	285	* PREFLUSH flag. Other operations may be marked as synchronous using the
	286	* REQ_SYNC flag.
	287	*/
ef295ecf CH	288	static inline bool op_is_sync(unsigned int op)
ef295ecf CH	289	{
b685d3d6 CH	290	return (op & REQ_OP_MASK) == REQ_OP_READ \|\|
b685d3d6 CH	291	(op & (REQ_SYNC \| REQ_FUA \| REQ_PREFLUSH));
ef295ecf	292	}
c11f0c0b	293
dece1635	294	typedef unsigned int blk_qc_t;
fd2d3326 JA	295	#define BLK_QC_T_NONE -1U
	296	#define BLK_QC_T_SHIFT 16
	297	#define BLK_QC_T_INTERNAL (1U << 31)
dece1635 JA	298
	299	static inline bool blk_qc_t_valid(blk_qc_t cookie)
	300	{
	301	return cookie != BLK_QC_T_NONE;
	302	}
	303
fd2d3326 JA	304	static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num,
fd2d3326 JA	305	bool internal)
dece1635	306	{
fd2d3326 JA	307	blk_qc_t ret = tag \| (queue_num << BLK_QC_T_SHIFT);
	308
	309	if (internal)
	310	ret \|= BLK_QC_T_INTERNAL;
	311
	312	return ret;
dece1635 JA	313	}
	314
	315	static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
	316	{
fd2d3326	317	return (cookie & ~BLK_QC_T_INTERNAL) >> BLK_QC_T_SHIFT;
dece1635 JA	318	}
	319
	320	static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
	321	{
e3a7a3bf	322	return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
dece1635 JA	323	}
dece1635 JA	324
fd2d3326 JA	325	static inline bool blk_qc_t_is_internal(blk_qc_t cookie)
	326	{
	327	return (cookie & BLK_QC_T_INTERNAL) != 0;
	328	}
	329
cf43e6be JA	330	struct blk_rq_stat {
	331	s64 mean;
	332	u64 min;
	333	u64 max;
	334	s32 nr_samples;
	335	s32 nr_batch;
	336	u64 batch;
cf43e6be JA	337	};
cf43e6be JA	338
7cc01581	339	#endif /* __LINUX_BLK_TYPES_H */