| /* |
| * 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 *); |
| |
| #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_opf; /* bottom bits req flags, |
| * top bits REQ_OP. Use |
| * accessors. |
| */ |
| 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_opf >> BIO_OP_SHIFT) |
| |
| #define bio_set_op_attrs(bio, op, op_flags) do { \ |
| WARN_ON(op >= (1 << REQ_OP_BITS)); \ |
| (bio)->bi_opf &= ((1 << BIO_OP_SHIFT) - 1); \ |
| (bio)->bi_opf |= ((unsigned int) (op) << BIO_OP_SHIFT); \ |
| (bio)->bi_opf |= 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_opf 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 = __REQ_RAHEAD, /* 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_URGENT, /* urgent 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_URGENT (1ULL << __REQ_URGENT) |
| #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 */ |