| /* |
| * 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 |
| |
| #ifdef CONFIG_BLOCK |
| |
| #include <linux/types.h> |
| |
| struct bio_set; |
| struct bio; |
| struct bio_integrity_payload; |
| struct page; |
| struct block_device; |
| typedef void (bio_end_io_t) (struct bio *, int); |
| 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; |
| }; |
| |
| /* |
| * main unit of I/O for the block layer and lower layers (ie drivers and |
| * stacking drivers) |
| */ |
| struct bio { |
| sector_t bi_sector; /* device address in 512 byte |
| sectors */ |
| struct bio *bi_next; /* request queue link */ |
| struct block_device *bi_bdev; |
| unsigned long bi_flags; /* status, command, etc */ |
| unsigned long bi_rw; /* bottom bits READ/WRITE, |
| * top bits priority |
| */ |
| |
| unsigned short bi_vcnt; /* how many bio_vec's */ |
| unsigned short bi_idx; /* current index into bvl_vec */ |
| |
| /* Number of segments in this BIO after |
| * physical address coalescing is performed. |
| */ |
| unsigned int bi_phys_segments; |
| |
| unsigned int bi_size; /* residual I/O count */ |
| |
| /* |
| * 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; |
| |
| unsigned int 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 */ |
| |
| bio_end_io_t *bi_end_io; |
| |
| void *bi_private; |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| struct bio_integrity_payload *bi_integrity; /* data integrity */ |
| #endif |
| |
| bio_destructor_t *bi_destructor; /* destructor */ |
| |
| /* |
| * 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]; |
| }; |
| |
| /* |
| * bio flags |
| */ |
| #define BIO_UPTODATE 0 /* ok after I/O completion */ |
| #define BIO_RW_BLOCK 1 /* RW_AHEAD set, and read/write would block */ |
| #define BIO_EOF 2 /* out-out-bounds error */ |
| #define BIO_SEG_VALID 3 /* bi_phys_segments valid */ |
| #define BIO_CLONED 4 /* doesn't own data */ |
| #define BIO_BOUNCED 5 /* bio is a bounce bio */ |
| #define BIO_USER_MAPPED 6 /* contains user pages */ |
| #define BIO_EOPNOTSUPP 7 /* not supported */ |
| #define BIO_NULL_MAPPED 8 /* contains invalid user pages */ |
| #define BIO_FS_INTEGRITY 9 /* fs owns integrity data, not block layer */ |
| #define BIO_QUIET 10 /* Make BIO Quiet */ |
| #define BIO_MAPPED_INTEGRITY 11/* integrity metadata has been remapped */ |
| #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) |
| |
| /* |
| * 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 (BITS_PER_LONG - 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_WRITE, /* not set, read. set, write */ |
| __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_DISCARD, /* request to discard sectors */ |
| __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ |
| |
| __REQ_NOIDLE, /* don't anticipate more IO after this one */ |
| __REQ_FUA, /* forced unit access */ |
| __REQ_FLUSH, /* 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 */ |
| __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_NR_BITS, /* stops here */ |
| }; |
| |
| #define REQ_WRITE (1 << __REQ_WRITE) |
| #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) |
| #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) |
| #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) |
| #define REQ_SYNC (1 << __REQ_SYNC) |
| #define REQ_META (1 << __REQ_META) |
| #define REQ_PRIO (1 << __REQ_PRIO) |
| #define REQ_DISCARD (1 << __REQ_DISCARD) |
| #define REQ_NOIDLE (1 << __REQ_NOIDLE) |
| |
| #define REQ_FAILFAST_MASK \ |
| (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) |
| #define REQ_COMMON_MASK \ |
| (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ |
| REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE) |
| #define REQ_CLONE_MASK REQ_COMMON_MASK |
| |
| #define REQ_RAHEAD (1 << __REQ_RAHEAD) |
| #define REQ_THROTTLED (1 << __REQ_THROTTLED) |
| |
| #define REQ_SORTED (1 << __REQ_SORTED) |
| #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) |
| #define REQ_FUA (1 << __REQ_FUA) |
| #define REQ_NOMERGE (1 << __REQ_NOMERGE) |
| #define REQ_STARTED (1 << __REQ_STARTED) |
| #define REQ_DONTPREP (1 << __REQ_DONTPREP) |
| #define REQ_QUEUED (1 << __REQ_QUEUED) |
| #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) |
| #define REQ_FAILED (1 << __REQ_FAILED) |
| #define REQ_QUIET (1 << __REQ_QUIET) |
| #define REQ_PREEMPT (1 << __REQ_PREEMPT) |
| #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
| #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
| #define REQ_FLUSH (1 << __REQ_FLUSH) |
| #define REQ_FLUSH_SEQ (1 << __REQ_FLUSH_SEQ) |
| #define REQ_IO_STAT (1 << __REQ_IO_STAT) |
| #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) |
| #define REQ_SECURE (1 << __REQ_SECURE) |
| |
| #endif /* __LINUX_BLK_TYPES_H */ |
