[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>

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 *);
typedef void (bio_destructor_t) (struct bio *);

/*
 * was unsigned short, but we might as well be ready for > 64kB I/O pages
 */
struct bio_vec {
	struct page	*bv_page;
	unsigned int	bv_len;
	unsigned int	bv_offset;
};

#ifdef CONFIG_BLOCK

struct bvec_iter {
	sector_t		bi_sector;	/* device address in 512 byte
						   sectors */
	unsigned int		bi_size;	/* residual I/O count */

	unsigned int		bi_idx;		/* current index into bvl_vec */

	unsigned int            bi_bvec_done;	/* number of bytes completed in
						   current bvec */
};

/*
 * 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;
	unsigned int		bi_flags;	/* status, command, etc */
	int			bi_error;
	unsigned int		bi_rw;		/* bottom bits req flags,
						 * top bits REQ_OP
						 */
	unsigned short		bi_ioprio;

	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;
#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_OP_SHIFT	(8 * sizeof(unsigned int) - REQ_OP_BITS)
#define bio_op(bio)	((bio)->bi_rw >> BIO_OP_SHIFT)

#define bio_set_op_attrs(bio, op, op_flags) do {		\
	WARN_ON(op >= (1 << REQ_OP_BITS));			\
	(bio)->bi_rw &= ((1 << BIO_OP_SHIFT) - 1);		\
	(bio)->bi_rw |= ((unsigned int) (op) << BIO_OP_SHIFT);	\
	(bio)->bi_rw |= op_flags;				\
} while (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 */

/*
 * Flags starting here get preserved by bio_reset() - this includes
 * BIO_POOL_IDX()
 */
#define BIO_RESET_BITS	13
#define BIO_OWNS_VEC	13	/* bio_free() should free bvec */

/*
 * top 4 bits of bio flags indicate the pool this bio came from
 */
#define BIO_POOL_BITS		(4)
#define BIO_POOL_NONE		((1UL << BIO_POOL_BITS) - 1)
#define BIO_POOL_OFFSET		(32 - BIO_POOL_BITS)
#define BIO_POOL_MASK		(1UL << BIO_POOL_OFFSET)
#define BIO_POOL_IDX(bio)	((bio)->bi_flags >> BIO_POOL_OFFSET)

#endif /* CONFIG_BLOCK */

/*
 * Request flags.  For use in the cmd_flags field of struct request, and in
 * bi_rw of struct bio.  Note that some flags are only valid in either one.
 */
enum rq_flag_bits {
	/* common flags */
	__REQ_FAILFAST_DEV,	/* no driver retries of device errors */
	__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_NOIDLE,		/* don't 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 */

	/* bio only flags */
	__REQ_RAHEAD,		/* read ahead, can fail anytime */
	__REQ_THROTTLED,	/* This bio has already been subjected to
				 * throttling rules. Don't do it again. */

	/* request only flags */
	__REQ_SORTED,		/* elevator knows about this request */
	__REQ_SOFTBARRIER,	/* may not be passed by ioscheduler */
	__REQ_NOMERGE,		/* don't touch this for merging */
	__REQ_STARTED,		/* drive already may have started this one */
	__REQ_DONTPREP,		/* don't call prep for this one */
	__REQ_QUEUED,		/* uses queueing */
	__REQ_ELVPRIV,		/* elevator private data attached */
	__REQ_FAILED,		/* set if the request failed */
	__REQ_QUIET,		/* don't worry about errors */
	__REQ_PREEMPT,		/* set for "ide_preempt" requests and also
				   for requests for which the SCSI "quiesce"
				   state must be ignored. */
	__REQ_ALLOCED,		/* request came from our alloc pool */
	__REQ_COPY_USER,	/* contains copies of user pages */
	__REQ_FLUSH_SEQ,	/* request for flush sequence */
	__REQ_IO_STAT,		/* account I/O stat */
	__REQ_MIXED_MERGE,	/* merge of different types, fail separately */
	__REQ_PM,		/* runtime pm request */
	__REQ_HASHED,		/* on IO scheduler merge hash */
	__REQ_MQ_INFLIGHT,	/* track inflight for MQ */
	__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_NOIDLE		(1ULL << __REQ_NOIDLE)
#define REQ_INTEGRITY		(1ULL << __REQ_INTEGRITY)

#define REQ_FAILFAST_MASK \
	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
#define REQ_COMMON_MASK \
	(REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | REQ_NOIDLE | \
	 REQ_PREFLUSH | REQ_FUA | REQ_INTEGRITY | REQ_NOMERGE)
#define REQ_CLONE_MASK		REQ_COMMON_MASK

/* This mask is used for both bio and request merge checking */
#define REQ_NOMERGE_FLAGS \
	(REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_PREFLUSH | REQ_FUA | REQ_FLUSH_SEQ)

#define REQ_RAHEAD		(1ULL << __REQ_RAHEAD)
#define REQ_THROTTLED		(1ULL << __REQ_THROTTLED)

#define REQ_SORTED		(1ULL << __REQ_SORTED)
#define REQ_SOFTBARRIER		(1ULL << __REQ_SOFTBARRIER)
#define REQ_FUA			(1ULL << __REQ_FUA)
#define REQ_NOMERGE		(1ULL << __REQ_NOMERGE)
#define REQ_STARTED		(1ULL << __REQ_STARTED)
#define REQ_DONTPREP		(1ULL << __REQ_DONTPREP)
#define REQ_QUEUED		(1ULL << __REQ_QUEUED)
#define REQ_ELVPRIV		(1ULL << __REQ_ELVPRIV)
#define REQ_FAILED		(1ULL << __REQ_FAILED)
#define REQ_QUIET		(1ULL << __REQ_QUIET)
#define REQ_PREEMPT		(1ULL << __REQ_PREEMPT)
#define REQ_ALLOCED		(1ULL << __REQ_ALLOCED)
#define REQ_COPY_USER		(1ULL << __REQ_COPY_USER)
#define REQ_PREFLUSH		(1ULL << __REQ_PREFLUSH)
#define REQ_FLUSH_SEQ		(1ULL << __REQ_FLUSH_SEQ)
#define REQ_IO_STAT		(1ULL << __REQ_IO_STAT)
#define REQ_MIXED_MERGE		(1ULL << __REQ_MIXED_MERGE)
#define REQ_PM			(1ULL << __REQ_PM)
#define REQ_HASHED		(1ULL << __REQ_HASHED)
#define REQ_MQ_INFLIGHT		(1ULL << __REQ_MQ_INFLIGHT)

enum req_op {
	REQ_OP_READ,
	REQ_OP_WRITE,
	REQ_OP_DISCARD,		/* request to discard sectors */
	REQ_OP_SECURE_ERASE,	/* request to securely erase sectors */
	REQ_OP_WRITE_SAME,	/* write same block many times */
	REQ_OP_FLUSH,		/* request for cache flush */
};

#define REQ_OP_BITS 3

typedef unsigned int blk_qc_t;
#define BLK_QC_T_NONE	-1U
#define BLK_QC_T_SHIFT	16

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)
{
	return tag | (queue_num << BLK_QC_T_SHIFT);
}

static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
{
	return cookie >> 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);
}

#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 TH	8	#include <linux/types.h>
	9
	10	struct bio_set;
	11	struct bio;
	12	struct bio_integrity_payload;
	13	struct page;
	14	struct block_device;
852c788f TH	15	struct io_context;
852c788f TH	16	struct cgroup_subsys_state;
4246a0b6	17	typedef void (bio_end_io_t) (struct bio *);
7cc01581 TH	18	typedef void (bio_destructor_t) (struct bio *);
	19
	20	/*
	21	* was unsigned short, but we might as well be ready for > 64kB I/O pages
	22	*/
	23	struct bio_vec {
	24	struct page *bv_page;
	25	unsigned int bv_len;
	26	unsigned int bv_offset;
	27	};
	28
62a8067a AV	29	#ifdef CONFIG_BLOCK
62a8067a AV	30
4f024f37 KO	31	struct bvec_iter {
	32	sector_t bi_sector; /* device address in 512 byte
	33	sectors */
	34	unsigned int bi_size; /* residual I/O count */
	35
	36	unsigned int bi_idx; /* current index into bvl_vec */
4550dd6c KO	37
	38	unsigned int bi_bvec_done; /* number of bytes completed in
	39	current bvec */
4f024f37 KO	40	};
4f024f37 KO	41
7cc01581 TH	42	/*
	43	* main unit of I/O for the block layer and lower layers (ie drivers and
	44	* stacking drivers)
	45	*/
	46	struct bio {
7cc01581 TH	47	struct bio bi_next; / request queue link */
7cc01581 TH	48	struct block_device *bi_bdev;
2c68f6dc JA	49	unsigned int bi_flags; /* status, command, etc */
2c68f6dc JA	50	int bi_error;
4e1b2d52 MC	51	unsigned int bi_rw; /* bottom bits req flags,
	52	* top bits REQ_OP
	53	*/
43b62ce3	54	unsigned short bi_ioprio;
7cc01581	55
4f024f37	56	struct bvec_iter bi_iter;
7cc01581 TH	57
	58	/* Number of segments in this BIO after
	59	* physical address coalescing is performed.
	60	*/
	61	unsigned int bi_phys_segments;
	62
7cc01581 TH	63	/*
	64	* To keep track of the max segment size, we account for the
	65	* sizes of the first and last mergeable segments in this bio.
	66	*/
	67	unsigned int bi_seg_front_size;
	68	unsigned int bi_seg_back_size;
	69
c4cf5261	70	atomic_t __bi_remaining;
196d38bc	71
7cc01581 TH	72	bio_end_io_t *bi_end_io;
	73
	74	void *bi_private;
852c788f TH	75	#ifdef CONFIG_BLK_CGROUP
	76	/*
	77	* Optional ioc and css associated with this bio. Put on bio
	78	* release. Read comment on top of bio_associate_current().
	79	*/
	80	struct io_context *bi_ioc;
	81	struct cgroup_subsys_state *bi_css;
	82	#endif
180b2f95	83	union {
7cc01581	84	#if defined(CONFIG_BLK_DEV_INTEGRITY)
180b2f95	85	struct bio_integrity_payload bi_integrity; / data integrity */
7cc01581	86	#endif
180b2f95	87	};
7cc01581	88
4f024f37 KO	89	unsigned short bi_vcnt; /* how many bio_vec's */
4f024f37 KO	90
f44b48c7 KO	91	/*
	92	* Everything starting with bi_max_vecs will be preserved by bio_reset()
	93	*/
	94
4f024f37	95	unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
f44b48c7	96
dac56212	97	atomic_t __bi_cnt; /* pin count */
f44b48c7 KO	98
	99	struct bio_vec bi_io_vec; / the actual vec list */
	100
395c72a7 KO	101	struct bio_set *bi_pool;
395c72a7 KO	102
7cc01581 TH	103	/*
	104	* We can inline a number of vecs at the end of the bio, to avoid
	105	* double allocations for a small number of bio_vecs. This member
	106	* MUST obviously be kept at the very end of the bio.
	107	*/
	108	struct bio_vec bi_inline_vecs[0];
	109	};
	110
4e1b2d52 MC	111	#define BIO_OP_SHIFT (8 * sizeof(unsigned int) - REQ_OP_BITS)
	112	#define bio_op(bio) ((bio)->bi_rw >> BIO_OP_SHIFT)
	113
	114	#define bio_set_op_attrs(bio, op, op_flags) do { \
	115	WARN_ON(op >= (1 << REQ_OP_BITS)); \
	116	(bio)->bi_rw &= ((1 << BIO_OP_SHIFT) - 1); \
	117	(bio)->bi_rw \|= ((unsigned int) (op) << BIO_OP_SHIFT); \
	118	(bio)->bi_rw \|= op_flags; \
	119	} while (0)
	120
f44b48c7 KO	121	#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
f44b48c7 KO	122
7cc01581 TH	123	/*
	124	* bio flags
	125	*/
b2dbe0a6 JA	126	#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
	127	#define BIO_CLONED 2 /* doesn't own data */
	128	#define BIO_BOUNCED 3 /* bio is a bounce bio */
	129	#define BIO_USER_MAPPED 4 /* contains user pages */
	130	#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
	131	#define BIO_QUIET 6 /* Make BIO Quiet */
a3ad0a9d JK	132	#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
a3ad0a9d JK	133	#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
f44b48c7 KO	134
	135	/*
	136	* Flags starting here get preserved by bio_reset() - this includes
	137	* BIO_POOL_IDX()
	138	*/
71368511	139	#define BIO_RESET_BITS 13
4de13d7a	140	#define BIO_OWNS_VEC 13 /* bio_free() should free bvec */
f44b48c7	141
7cc01581 TH	142	/*
	143	* top 4 bits of bio flags indicate the pool this bio came from
	144	*/
	145	#define BIO_POOL_BITS (4)
	146	#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
2c68f6dc	147	#define BIO_POOL_OFFSET (32 - BIO_POOL_BITS)
7cc01581 TH	148	#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
	149	#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
	150
de75d60d JA	151	#endif /* CONFIG_BLOCK */
de75d60d JA	152
7cc01581 TH	153	/*
	154	* Request flags. For use in the cmd_flags field of struct request, and in
	155	* bi_rw of struct bio. Note that some flags are only valid in either one.
	156	*/
	157	enum rq_flag_bits {
	158	/* common flags */
7cc01581 TH	159	__REQ_FAILFAST_DEV, /* no driver retries of device errors */
	160	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
	161	__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
	162
7cc01581 TH	163	__REQ_SYNC, /* request is sync (sync write or read) */
7cc01581 TH	164	__REQ_META, /* metadata io request */
65299a3b	165	__REQ_PRIO, /* boost priority in cfq */
8e4bf844	166
7cc01581	167	__REQ_NOIDLE, /* don't anticipate more IO after this one */
180b2f95	168	__REQ_INTEGRITY, /* I/O includes block integrity payload */
8e4bf844	169	__REQ_FUA, /* forced unit access */
28a8f0d3	170	__REQ_PREFLUSH, /* request for cache flush */
7cc01581 TH	171
7cc01581 TH	172	/* bio only flags */
7cc01581	173	__REQ_RAHEAD, /* read ahead, can fail anytime */
e43473b7 VG	174	__REQ_THROTTLED, /* This bio has already been subjected to
e43473b7 VG	175	* throttling rules. Don't do it again. */
7cc01581 TH	176
	177	/* request only flags */
	178	__REQ_SORTED, /* elevator knows about this request */
	179	__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
7cc01581 TH	180	__REQ_NOMERGE, /* don't touch this for merging */
	181	__REQ_STARTED, /* drive already may have started this one */
	182	__REQ_DONTPREP, /* don't call prep for this one */
	183	__REQ_QUEUED, /* uses queueing */
	184	__REQ_ELVPRIV, /* elevator private data attached */
	185	__REQ_FAILED, /* set if the request failed */
	186	__REQ_QUIET, /* don't worry about errors */
bba0bdd7 BVA	187	__REQ_PREEMPT, /* set for "ide_preempt" requests and also
	188	for requests for which the SCSI "quiesce"
	189	state must be ignored. */
7cc01581 TH	190	__REQ_ALLOCED, /* request came from our alloc pool */
7cc01581 TH	191	__REQ_COPY_USER, /* contains copies of user pages */
414b4ff5	192	__REQ_FLUSH_SEQ, /* request for flush sequence */
7cc01581 TH	193	__REQ_IO_STAT, /* account I/O stat */
7cc01581 TH	194	__REQ_MIXED_MERGE, /* merge of different types, fail separately */
66311274	195	__REQ_PM, /* runtime pm request */
360f92c2	196	__REQ_HASHED, /* on IO scheduler merge hash */
0d2602ca	197	__REQ_MQ_INFLIGHT, /* track inflight for MQ */
7cc01581 TH	198	__REQ_NR_BITS, /* stops here */
	199	};
	200
5953316d JA	201	#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
	202	#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
	203	#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
	204	#define REQ_SYNC (1ULL << __REQ_SYNC)
	205	#define REQ_META (1ULL << __REQ_META)
	206	#define REQ_PRIO (1ULL << __REQ_PRIO)
5953316d	207	#define REQ_NOIDLE (1ULL << __REQ_NOIDLE)
180b2f95	208	#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
7cc01581 TH	209
	210	#define REQ_FAILFAST_MASK \
	211	(REQ_FAILFAST_DEV \| REQ_FAILFAST_TRANSPORT \| REQ_FAILFAST_DRIVER)
	212	#define REQ_COMMON_MASK \
4e1b2d52	213	(REQ_FAILFAST_MASK \| REQ_SYNC \| REQ_META \| REQ_PRIO \| REQ_NOIDLE \| \
288dab8a	214	REQ_PREFLUSH \| REQ_FUA \| REQ_INTEGRITY \| REQ_NOMERGE)
3a2edd0d	215	#define REQ_CLONE_MASK REQ_COMMON_MASK
7cc01581	216
e2a60da7 MP	217	/* This mask is used for both bio and request merge checking */
e2a60da7 MP	218	#define REQ_NOMERGE_FLAGS \
28a8f0d3	219	(REQ_NOMERGE \| REQ_STARTED \| REQ_SOFTBARRIER \| REQ_PREFLUSH \| REQ_FUA \| REQ_FLUSH_SEQ)
e2a60da7	220
5953316d JA	221	#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
	222	#define REQ_THROTTLED (1ULL << __REQ_THROTTLED)
	223
	224	#define REQ_SORTED (1ULL << __REQ_SORTED)
	225	#define REQ_SOFTBARRIER (1ULL << __REQ_SOFTBARRIER)
	226	#define REQ_FUA (1ULL << __REQ_FUA)
	227	#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
	228	#define REQ_STARTED (1ULL << __REQ_STARTED)
	229	#define REQ_DONTPREP (1ULL << __REQ_DONTPREP)
	230	#define REQ_QUEUED (1ULL << __REQ_QUEUED)
	231	#define REQ_ELVPRIV (1ULL << __REQ_ELVPRIV)
	232	#define REQ_FAILED (1ULL << __REQ_FAILED)
	233	#define REQ_QUIET (1ULL << __REQ_QUIET)
	234	#define REQ_PREEMPT (1ULL << __REQ_PREEMPT)
	235	#define REQ_ALLOCED (1ULL << __REQ_ALLOCED)
	236	#define REQ_COPY_USER (1ULL << __REQ_COPY_USER)
28a8f0d3	237	#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
5953316d JA	238	#define REQ_FLUSH_SEQ (1ULL << __REQ_FLUSH_SEQ)
	239	#define REQ_IO_STAT (1ULL << __REQ_IO_STAT)
	240	#define REQ_MIXED_MERGE (1ULL << __REQ_MIXED_MERGE)
5953316d	241	#define REQ_PM (1ULL << __REQ_PM)
360f92c2	242	#define REQ_HASHED (1ULL << __REQ_HASHED)
0d2602ca	243	#define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT)
7cc01581	244
f2150821 MC	245	enum req_op {
f2150821 MC	246	REQ_OP_READ,
4e1b2d52 MC	247	REQ_OP_WRITE,
4e1b2d52 MC	248	REQ_OP_DISCARD, /* request to discard sectors */
288dab8a	249	REQ_OP_SECURE_ERASE, /* request to securely erase sectors */
4e1b2d52	250	REQ_OP_WRITE_SAME, /* write same block many times */
3a5e02ce	251	REQ_OP_FLUSH, /* request for cache flush */
f2150821 MC	252	};
f2150821 MC	253
3a5e02ce	254	#define REQ_OP_BITS 3
f2150821	255
dece1635 JA	256	typedef unsigned int blk_qc_t;
	257	#define BLK_QC_T_NONE -1U
	258	#define BLK_QC_T_SHIFT 16
	259
	260	static inline bool blk_qc_t_valid(blk_qc_t cookie)
	261	{
	262	return cookie != BLK_QC_T_NONE;
	263	}
	264
	265	static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num)
	266	{
	267	return tag \| (queue_num << BLK_QC_T_SHIFT);
	268	}
	269
	270	static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
	271	{
	272	return cookie >> BLK_QC_T_SHIFT;
	273	}
	274
	275	static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
	276	{
e3a7a3bf	277	return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
dece1635 JA	278	}
dece1635 JA	279
7cc01581	280	#endif /* __LINUX_BLK_TYPES_H */