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include/linux/blk_types.h
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/* * 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 */ |
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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 */ |
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#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 */ |
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#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) |
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#endif /* CONFIG_BLOCK */ |
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/* * 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 */ |
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__REQ_SYNC, /* request is sync (sync write or read) */ __REQ_META, /* metadata io request */ |
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__REQ_PRIO, /* boost priority in cfq */ |
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__REQ_DISCARD, /* request to discard sectors */ |
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__REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */ |
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__REQ_NOIDLE, /* don't anticipate more IO after this one */ |
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__REQ_FUA, /* forced unit access */ __REQ_FLUSH, /* request for cache flush */ |
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/* bio only flags */ |
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__REQ_RAHEAD, /* read ahead, can fail anytime */ |
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__REQ_THROTTLED, /* This bio has already been subjected to * throttling rules. Don't do it again. */ |
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/* request only flags */ __REQ_SORTED, /* elevator knows about this request */ __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ |
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__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 */ |
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__REQ_ALLOCED, /* request came from our alloc pool */ __REQ_COPY_USER, /* contains copies of user pages */ |
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__REQ_FLUSH_SEQ, /* request for flush sequence */ |
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__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) |
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#define REQ_SYNC (1 << __REQ_SYNC) #define REQ_META (1 << __REQ_META) |
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#define REQ_PRIO (1 << __REQ_PRIO) |
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#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 \ |
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(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ REQ_DISCARD | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE) |
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#define REQ_CLONE_MASK REQ_COMMON_MASK |
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#define REQ_RAHEAD (1 << __REQ_RAHEAD) |
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#define REQ_THROTTLED (1 << __REQ_THROTTLED) |
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#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) |
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#define REQ_ALLOCED (1 << __REQ_ALLOCED) #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
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#define REQ_FLUSH (1 << __REQ_FLUSH) |
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#define REQ_FLUSH_SEQ (1 << __REQ_FLUSH_SEQ) |
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#define REQ_IO_STAT (1 << __REQ_IO_STAT) #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) |
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#define REQ_SECURE (1 << __REQ_SECURE) |
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#endif /* __LINUX_BLK_TYPES_H */ |