[linux-2.6-block.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 *);
typedef void (bio_destructor_t) (struct bio *);

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

#ifdef CONFIG_BLOCK
/*
 * 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;
	int			bi_error;
	unsigned int		bi_rw;		/* bottom bits req flags,
						 * top bits REQ_OP
						 */
	unsigned short		bi_flags;	/* status, command, etc */
	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
 * BVEC_POOL_IDX()
 */
#define BIO_RESET_BITS	10

/*
 * 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 4 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		(4)
#define BVEC_POOL_OFFSET	(16 - BVEC_POOL_BITS)
#define BVEC_POOL_IDX(bio)	((bio)->bi_flags >> BVEC_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)

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	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 TH	19	typedef void (bio_destructor_t) (struct bio *);
7cc01581 TH	20
abf54548 MC	21	enum req_op {
	22	REQ_OP_READ,
	23	REQ_OP_WRITE,
	24	REQ_OP_DISCARD, /* request to discard sectors */
	25	REQ_OP_SECURE_ERASE, /* request to securely erase sectors */
	26	REQ_OP_WRITE_SAME, /* write same block many times */
	27	REQ_OP_FLUSH, /* request for cache flush */
	28	};
	29
	30	#define REQ_OP_BITS 3
	31
62a8067a	32	#ifdef CONFIG_BLOCK
7cc01581 TH	33	/*
	34	* main unit of I/O for the block layer and lower layers (ie drivers and
	35	* stacking drivers)
	36	*/
	37	struct bio {
7cc01581 TH	38	struct bio bi_next; / request queue link */
7cc01581 TH	39	struct block_device *bi_bdev;
2c68f6dc	40	int bi_error;
4e1b2d52 MC	41	unsigned int bi_rw; /* bottom bits req flags,
	42	* top bits REQ_OP
	43	*/
c0acf12a	44	unsigned short bi_flags; /* status, command, etc */
43b62ce3	45	unsigned short bi_ioprio;
7cc01581	46
4f024f37	47	struct bvec_iter bi_iter;
7cc01581 TH	48
	49	/* Number of segments in this BIO after
	50	* physical address coalescing is performed.
	51	*/
	52	unsigned int bi_phys_segments;
	53
7cc01581 TH	54	/*
	55	* To keep track of the max segment size, we account for the
	56	* sizes of the first and last mergeable segments in this bio.
	57	*/
	58	unsigned int bi_seg_front_size;
	59	unsigned int bi_seg_back_size;
	60
c4cf5261	61	atomic_t __bi_remaining;
196d38bc	62
7cc01581 TH	63	bio_end_io_t *bi_end_io;
	64
	65	void *bi_private;
852c788f TH	66	#ifdef CONFIG_BLK_CGROUP
	67	/*
	68	* Optional ioc and css associated with this bio. Put on bio
	69	* release. Read comment on top of bio_associate_current().
	70	*/
	71	struct io_context *bi_ioc;
	72	struct cgroup_subsys_state *bi_css;
	73	#endif
180b2f95	74	union {
7cc01581	75	#if defined(CONFIG_BLK_DEV_INTEGRITY)
180b2f95	76	struct bio_integrity_payload bi_integrity; / data integrity */
7cc01581	77	#endif
180b2f95	78	};
7cc01581	79
4f024f37 KO	80	unsigned short bi_vcnt; /* how many bio_vec's */
4f024f37 KO	81
f44b48c7 KO	82	/*
	83	* Everything starting with bi_max_vecs will be preserved by bio_reset()
	84	*/
	85
4f024f37	86	unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
f44b48c7	87
dac56212	88	atomic_t __bi_cnt; /* pin count */
f44b48c7 KO	89
	90	struct bio_vec bi_io_vec; / the actual vec list */
	91
395c72a7 KO	92	struct bio_set *bi_pool;
395c72a7 KO	93
7cc01581 TH	94	/*
	95	* We can inline a number of vecs at the end of the bio, to avoid
	96	* double allocations for a small number of bio_vecs. This member
	97	* MUST obviously be kept at the very end of the bio.
	98	*/
	99	struct bio_vec bi_inline_vecs[0];
	100	};
	101
4e1b2d52 MC	102	#define BIO_OP_SHIFT (8 * sizeof(unsigned int) - REQ_OP_BITS)
	103	#define bio_op(bio) ((bio)->bi_rw >> BIO_OP_SHIFT)
	104
	105	#define bio_set_op_attrs(bio, op, op_flags) do { \
	106	WARN_ON(op >= (1 << REQ_OP_BITS)); \
	107	(bio)->bi_rw &= ((1 << BIO_OP_SHIFT) - 1); \
	108	(bio)->bi_rw \|= ((unsigned int) (op) << BIO_OP_SHIFT); \
	109	(bio)->bi_rw \|= op_flags; \
	110	} while (0)
	111
f44b48c7 KO	112	#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
f44b48c7 KO	113
7cc01581 TH	114	/*
	115	* bio flags
	116	*/
b2dbe0a6 JA	117	#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
	118	#define BIO_CLONED 2 /* doesn't own data */
	119	#define BIO_BOUNCED 3 /* bio is a bounce bio */
	120	#define BIO_USER_MAPPED 4 /* contains user pages */
	121	#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
	122	#define BIO_QUIET 6 /* Make BIO Quiet */
a3ad0a9d JK	123	#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
a3ad0a9d JK	124	#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
f44b48c7 KO	125
	126	/*
	127	* Flags starting here get preserved by bio_reset() - this includes
ed996a52	128	* BVEC_POOL_IDX()
f44b48c7	129	*/
c0acf12a	130	#define BIO_RESET_BITS 10
f44b48c7	131
7cc01581	132	/*
ed996a52 CH	133	* We support 6 different bvec pools, the last one is magic in that it
ed996a52 CH	134	* is backed by a mempool.
7cc01581	135	*/
ed996a52 CH	136	#define BVEC_POOL_NR 6
	137	#define BVEC_POOL_MAX (BVEC_POOL_NR - 1)
	138
	139	/*
	140	* Top 4 bits of bio flags indicate the pool the bvecs came from. We add
	141	* 1 to the actual index so that 0 indicates that there are no bvecs to be
	142	* freed.
	143	*/
	144	#define BVEC_POOL_BITS (4)
c0acf12a	145	#define BVEC_POOL_OFFSET (16 - BVEC_POOL_BITS)
ed996a52	146	#define BVEC_POOL_IDX(bio) ((bio)->bi_flags >> BVEC_POOL_OFFSET)
7cc01581	147
de75d60d JA	148	#endif /* CONFIG_BLOCK */
de75d60d JA	149
7cc01581 TH	150	/*
	151	* Request flags. For use in the cmd_flags field of struct request, and in
	152	* bi_rw of struct bio. Note that some flags are only valid in either one.
	153	*/
	154	enum rq_flag_bits {
	155	/* common flags */
7cc01581 TH	156	__REQ_FAILFAST_DEV, /* no driver retries of device errors */
	157	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
	158	__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
	159
7cc01581 TH	160	__REQ_SYNC, /* request is sync (sync write or read) */
7cc01581 TH	161	__REQ_META, /* metadata io request */
65299a3b	162	__REQ_PRIO, /* boost priority in cfq */
8e4bf844	163
7cc01581	164	__REQ_NOIDLE, /* don't anticipate more IO after this one */
180b2f95	165	__REQ_INTEGRITY, /* I/O includes block integrity payload */
8e4bf844	166	__REQ_FUA, /* forced unit access */
28a8f0d3	167	__REQ_PREFLUSH, /* request for cache flush */
7cc01581 TH	168
7cc01581 TH	169	/* bio only flags */
7cc01581	170	__REQ_RAHEAD, /* read ahead, can fail anytime */
e43473b7 VG	171	__REQ_THROTTLED, /* This bio has already been subjected to
e43473b7 VG	172	* throttling rules. Don't do it again. */
7cc01581 TH	173
	174	/* request only flags */
	175	__REQ_SORTED, /* elevator knows about this request */
	176	__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
7cc01581 TH	177	__REQ_NOMERGE, /* don't touch this for merging */
	178	__REQ_STARTED, /* drive already may have started this one */
	179	__REQ_DONTPREP, /* don't call prep for this one */
	180	__REQ_QUEUED, /* uses queueing */
	181	__REQ_ELVPRIV, /* elevator private data attached */
	182	__REQ_FAILED, /* set if the request failed */
	183	__REQ_QUIET, /* don't worry about errors */
bba0bdd7 BVA	184	__REQ_PREEMPT, /* set for "ide_preempt" requests and also
	185	for requests for which the SCSI "quiesce"
	186	state must be ignored. */
7cc01581 TH	187	__REQ_ALLOCED, /* request came from our alloc pool */
7cc01581 TH	188	__REQ_COPY_USER, /* contains copies of user pages */
414b4ff5	189	__REQ_FLUSH_SEQ, /* request for flush sequence */
7cc01581 TH	190	__REQ_IO_STAT, /* account I/O stat */
7cc01581 TH	191	__REQ_MIXED_MERGE, /* merge of different types, fail separately */
66311274	192	__REQ_PM, /* runtime pm request */
360f92c2	193	__REQ_HASHED, /* on IO scheduler merge hash */
0d2602ca	194	__REQ_MQ_INFLIGHT, /* track inflight for MQ */
7cc01581 TH	195	__REQ_NR_BITS, /* stops here */
	196	};
	197
5953316d JA	198	#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
	199	#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
	200	#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
	201	#define REQ_SYNC (1ULL << __REQ_SYNC)
	202	#define REQ_META (1ULL << __REQ_META)
	203	#define REQ_PRIO (1ULL << __REQ_PRIO)
5953316d	204	#define REQ_NOIDLE (1ULL << __REQ_NOIDLE)
180b2f95	205	#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
7cc01581 TH	206
	207	#define REQ_FAILFAST_MASK \
	208	(REQ_FAILFAST_DEV \| REQ_FAILFAST_TRANSPORT \| REQ_FAILFAST_DRIVER)
	209	#define REQ_COMMON_MASK \
4e1b2d52	210	(REQ_FAILFAST_MASK \| REQ_SYNC \| REQ_META \| REQ_PRIO \| REQ_NOIDLE \| \
288dab8a	211	REQ_PREFLUSH \| REQ_FUA \| REQ_INTEGRITY \| REQ_NOMERGE)
3a2edd0d	212	#define REQ_CLONE_MASK REQ_COMMON_MASK
7cc01581	213
e2a60da7 MP	214	/* This mask is used for both bio and request merge checking */
e2a60da7 MP	215	#define REQ_NOMERGE_FLAGS \
28a8f0d3	216	(REQ_NOMERGE \| REQ_STARTED \| REQ_SOFTBARRIER \| REQ_PREFLUSH \| REQ_FUA \| REQ_FLUSH_SEQ)
e2a60da7	217
5953316d JA	218	#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
	219	#define REQ_THROTTLED (1ULL << __REQ_THROTTLED)
	220
	221	#define REQ_SORTED (1ULL << __REQ_SORTED)
	222	#define REQ_SOFTBARRIER (1ULL << __REQ_SOFTBARRIER)
	223	#define REQ_FUA (1ULL << __REQ_FUA)
	224	#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
	225	#define REQ_STARTED (1ULL << __REQ_STARTED)
	226	#define REQ_DONTPREP (1ULL << __REQ_DONTPREP)
	227	#define REQ_QUEUED (1ULL << __REQ_QUEUED)
	228	#define REQ_ELVPRIV (1ULL << __REQ_ELVPRIV)
	229	#define REQ_FAILED (1ULL << __REQ_FAILED)
	230	#define REQ_QUIET (1ULL << __REQ_QUIET)
	231	#define REQ_PREEMPT (1ULL << __REQ_PREEMPT)
	232	#define REQ_ALLOCED (1ULL << __REQ_ALLOCED)
	233	#define REQ_COPY_USER (1ULL << __REQ_COPY_USER)
28a8f0d3	234	#define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH)
5953316d JA	235	#define REQ_FLUSH_SEQ (1ULL << __REQ_FLUSH_SEQ)
	236	#define REQ_IO_STAT (1ULL << __REQ_IO_STAT)
	237	#define REQ_MIXED_MERGE (1ULL << __REQ_MIXED_MERGE)
5953316d	238	#define REQ_PM (1ULL << __REQ_PM)
360f92c2	239	#define REQ_HASHED (1ULL << __REQ_HASHED)
0d2602ca	240	#define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT)
7cc01581	241
dece1635 JA	242	typedef unsigned int blk_qc_t;
	243	#define BLK_QC_T_NONE -1U
	244	#define BLK_QC_T_SHIFT 16
	245
	246	static inline bool blk_qc_t_valid(blk_qc_t cookie)
	247	{
	248	return cookie != BLK_QC_T_NONE;
	249	}
	250
	251	static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num)
	252	{
	253	return tag \| (queue_num << BLK_QC_T_SHIFT);
	254	}
	255
	256	static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
	257	{
	258	return cookie >> BLK_QC_T_SHIFT;
	259	}
	260
	261	static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
	262	{
e3a7a3bf	263	return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
dece1635 JA	264	}
dece1635 JA	265
7cc01581	266	#endif /* __LINUX_BLK_TYPES_H */