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bio, fs: separate out bio_types.h and define READ/WRITE constants in …
…terms of BIO_RW_* flags linux/fs.h hard coded READ/WRITE constants which should match BIO_RW_* flags. This is fragile and caused breakage during BIO_RW_* flag rearrangement. The hardcoding is to avoid include dependency hell. Create linux/bio_types.h which contatins definitions for bio data structures and flags and include it from bio.h and fs.h, and make fs.h define all READ/WRITE related constants in terms of BIO_RW_* flags. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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Tejun Heo
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Jens Axboe
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Aug 7, 2010
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,193 @@ | ||
| /* | ||
| * 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 | ||
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| #ifdef CONFIG_BLOCK | ||
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| #include <linux/types.h> | ||
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| 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 *); | ||
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| /* | ||
| * 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; | ||
| }; | ||
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| /* | ||
| * 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 | ||
| */ | ||
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| unsigned short bi_vcnt; /* how many bio_vec's */ | ||
| unsigned short bi_idx; /* current index into bvl_vec */ | ||
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| /* Number of segments in this BIO after | ||
| * physical address coalescing is performed. | ||
| */ | ||
| unsigned int bi_phys_segments; | ||
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| unsigned int bi_size; /* residual I/O count */ | ||
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| /* | ||
| * 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; | ||
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| unsigned int bi_max_vecs; /* max bvl_vecs we can hold */ | ||
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| unsigned int bi_comp_cpu; /* completion CPU */ | ||
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| atomic_t bi_cnt; /* pin count */ | ||
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| struct bio_vec *bi_io_vec; /* the actual vec list */ | ||
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| bio_end_io_t *bi_end_io; | ||
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| void *bi_private; | ||
| #if defined(CONFIG_BLK_DEV_INTEGRITY) | ||
| struct bio_integrity_payload *bi_integrity; /* data integrity */ | ||
| #endif | ||
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| bio_destructor_t *bi_destructor; /* destructor */ | ||
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| /* | ||
| * 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]; | ||
| }; | ||
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| /* | ||
| * 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_CPU_AFFINE 8 /* complete bio on same CPU as submitted */ | ||
| #define BIO_NULL_MAPPED 9 /* contains invalid user pages */ | ||
| #define BIO_FS_INTEGRITY 10 /* fs owns integrity data, not block layer */ | ||
| #define BIO_QUIET 11 /* Make BIO Quiet */ | ||
| #define bio_flagged(bio, flag) ((bio)->bi_flags & (1 << (flag))) | ||
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| /* | ||
| * 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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| /* | ||
| * 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_HARDBARRIER, /* may not be passed by drive either */ | ||
| __REQ_SYNC, /* request is sync (sync write or read) */ | ||
| __REQ_META, /* metadata io request */ | ||
| __REQ_DISCARD, /* request to discard sectors */ | ||
| __REQ_NOIDLE, /* don't anticipate more IO after this one */ | ||
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| /* bio only flags */ | ||
| __REQ_UNPLUG, /* unplug the immediately after submission */ | ||
| __REQ_RAHEAD, /* read ahead, can fail anytime */ | ||
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| /* request only flags */ | ||
| __REQ_SORTED, /* elevator knows about this request */ | ||
| __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | ||
| __REQ_FUA, /* forced unit access */ | ||
| __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_ORDERED_COLOR, /* is before or after barrier */ | ||
| __REQ_ALLOCED, /* request came from our alloc pool */ | ||
| __REQ_COPY_USER, /* contains copies of user pages */ | ||
| __REQ_INTEGRITY, /* integrity metadata has been remapped */ | ||
| __REQ_FLUSH, /* request for cache flush */ | ||
| __REQ_IO_STAT, /* account I/O stat */ | ||
| __REQ_MIXED_MERGE, /* merge of different types, fail separately */ | ||
| __REQ_NR_BITS, /* stops here */ | ||
| }; | ||
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| #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_HARDBARRIER (1 << __REQ_HARDBARRIER) | ||
| #define REQ_SYNC (1 << __REQ_SYNC) | ||
| #define REQ_META (1 << __REQ_META) | ||
| #define REQ_DISCARD (1 << __REQ_DISCARD) | ||
| #define REQ_NOIDLE (1 << __REQ_NOIDLE) | ||
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| #define REQ_FAILFAST_MASK \ | ||
| (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) | ||
| #define REQ_COMMON_MASK \ | ||
| (REQ_WRITE | REQ_FAILFAST_MASK | REQ_HARDBARRIER | REQ_SYNC | \ | ||
| REQ_META| REQ_DISCARD | REQ_NOIDLE) | ||
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| #define REQ_UNPLUG (1 << __REQ_UNPLUG) | ||
| #define REQ_RAHEAD (1 << __REQ_RAHEAD) | ||
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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) | ||
| #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | ||
| #define REQ_ALLOCED (1 << __REQ_ALLOCED) | ||
| #define REQ_COPY_USER (1 << __REQ_COPY_USER) | ||
| #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) | ||
| #define REQ_FLUSH (1 << __REQ_FLUSH) | ||
| #define REQ_IO_STAT (1 << __REQ_IO_STAT) | ||
| #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) | ||
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| #endif /* CONFIG_BLOCK */ | ||
| #endif /* __LINUX_BLK_TYPES_H */ |
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