bbc758ec04
This was added for the 'magic' AEN requests in the NVMe driver that never return. We now handle them purely inside the driver and don't need this core hack any more. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
270 lines
8.3 KiB
C
270 lines
8.3 KiB
C
/*
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* Block data types and constants. Directly include this file only to
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* break include dependency loop.
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*/
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#ifndef __LINUX_BLK_TYPES_H
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#define __LINUX_BLK_TYPES_H
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#include <linux/types.h>
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struct bio_set;
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struct bio;
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struct bio_integrity_payload;
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struct page;
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struct block_device;
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struct io_context;
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struct cgroup_subsys_state;
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typedef void (bio_end_io_t) (struct bio *);
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typedef void (bio_destructor_t) (struct bio *);
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/*
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* was unsigned short, but we might as well be ready for > 64kB I/O pages
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*/
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struct bio_vec {
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struct page *bv_page;
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unsigned int bv_len;
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unsigned int bv_offset;
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};
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#ifdef CONFIG_BLOCK
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struct bvec_iter {
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sector_t bi_sector; /* device address in 512 byte
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sectors */
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unsigned int bi_size; /* residual I/O count */
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unsigned int bi_idx; /* current index into bvl_vec */
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unsigned int bi_bvec_done; /* number of bytes completed in
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current bvec */
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};
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/*
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* main unit of I/O for the block layer and lower layers (ie drivers and
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* stacking drivers)
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*/
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struct bio {
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struct bio *bi_next; /* request queue link */
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struct block_device *bi_bdev;
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unsigned int bi_flags; /* status, command, etc */
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int bi_error;
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unsigned long bi_rw; /* bottom bits READ/WRITE,
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* top bits priority
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*/
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struct bvec_iter bi_iter;
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/* Number of segments in this BIO after
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* physical address coalescing is performed.
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*/
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unsigned int bi_phys_segments;
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/*
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* To keep track of the max segment size, we account for the
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* sizes of the first and last mergeable segments in this bio.
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*/
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unsigned int bi_seg_front_size;
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unsigned int bi_seg_back_size;
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atomic_t __bi_remaining;
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bio_end_io_t *bi_end_io;
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void *bi_private;
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#ifdef CONFIG_BLK_CGROUP
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/*
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* Optional ioc and css associated with this bio. Put on bio
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* release. Read comment on top of bio_associate_current().
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*/
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struct io_context *bi_ioc;
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struct cgroup_subsys_state *bi_css;
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#endif
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union {
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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struct bio_integrity_payload *bi_integrity; /* data integrity */
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#endif
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};
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unsigned short bi_vcnt; /* how many bio_vec's */
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/*
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* Everything starting with bi_max_vecs will be preserved by bio_reset()
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*/
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unsigned short bi_max_vecs; /* max bvl_vecs we can hold */
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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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struct bio_set *bi_pool;
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/*
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* We can inline a number of vecs at the end of the bio, to avoid
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* double allocations for a small number of bio_vecs. This member
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* MUST obviously be kept at the very end of the bio.
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*/
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struct bio_vec bi_inline_vecs[0];
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};
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#define BIO_RESET_BYTES offsetof(struct bio, bi_max_vecs)
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/*
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* bio flags
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*/
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#define BIO_SEG_VALID 1 /* bi_phys_segments valid */
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#define BIO_CLONED 2 /* doesn't own data */
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#define BIO_BOUNCED 3 /* bio is a bounce bio */
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#define BIO_USER_MAPPED 4 /* contains user pages */
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#define BIO_NULL_MAPPED 5 /* contains invalid user pages */
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#define BIO_QUIET 6 /* Make BIO Quiet */
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#define BIO_CHAIN 7 /* chained bio, ->bi_remaining in effect */
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#define BIO_REFFED 8 /* bio has elevated ->bi_cnt */
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/*
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* Flags starting here get preserved by bio_reset() - this includes
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* BIO_POOL_IDX()
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*/
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#define BIO_RESET_BITS 13
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#define BIO_OWNS_VEC 13 /* bio_free() should free bvec */
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/*
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* top 4 bits of bio flags indicate the pool this bio came from
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*/
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#define BIO_POOL_BITS (4)
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#define BIO_POOL_NONE ((1UL << BIO_POOL_BITS) - 1)
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#define BIO_POOL_OFFSET (32 - BIO_POOL_BITS)
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#define BIO_POOL_MASK (1UL << BIO_POOL_OFFSET)
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#define BIO_POOL_IDX(bio) ((bio)->bi_flags >> BIO_POOL_OFFSET)
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#endif /* CONFIG_BLOCK */
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/*
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* Request flags. For use in the cmd_flags field of struct request, and in
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* bi_rw of struct bio. Note that some flags are only valid in either one.
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*/
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enum rq_flag_bits {
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/* common flags */
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__REQ_WRITE, /* not set, read. set, write */
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__REQ_FAILFAST_DEV, /* no driver retries of device errors */
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__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
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__REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
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__REQ_SYNC, /* request is sync (sync write or read) */
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__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_WRITE_SAME, /* write same block many times */
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__REQ_NOIDLE, /* don't anticipate more IO after this one */
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__REQ_INTEGRITY, /* I/O includes block integrity payload */
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__REQ_FUA, /* forced unit access */
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__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
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* throttling rules. Don't do it again. */
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/* request only flags */
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__REQ_SORTED, /* elevator knows about this request */
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__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
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__REQ_NOMERGE, /* don't touch this for merging */
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__REQ_STARTED, /* drive already may have started this one */
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__REQ_DONTPREP, /* don't call prep for this one */
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__REQ_QUEUED, /* uses queueing */
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__REQ_ELVPRIV, /* elevator private data attached */
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__REQ_FAILED, /* set if the request failed */
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__REQ_QUIET, /* don't worry about errors */
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__REQ_PREEMPT, /* set for "ide_preempt" requests and also
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for requests for which the SCSI "quiesce"
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state must be ignored. */
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__REQ_ALLOCED, /* request came from our alloc pool */
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__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 */
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__REQ_MIXED_MERGE, /* merge of different types, fail separately */
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__REQ_PM, /* runtime pm request */
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__REQ_HASHED, /* on IO scheduler merge hash */
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__REQ_MQ_INFLIGHT, /* track inflight for MQ */
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__REQ_NR_BITS, /* stops here */
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};
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#define REQ_WRITE (1ULL << __REQ_WRITE)
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#define REQ_FAILFAST_DEV (1ULL << __REQ_FAILFAST_DEV)
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#define REQ_FAILFAST_TRANSPORT (1ULL << __REQ_FAILFAST_TRANSPORT)
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#define REQ_FAILFAST_DRIVER (1ULL << __REQ_FAILFAST_DRIVER)
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#define REQ_SYNC (1ULL << __REQ_SYNC)
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#define REQ_META (1ULL << __REQ_META)
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#define REQ_PRIO (1ULL << __REQ_PRIO)
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#define REQ_DISCARD (1ULL << __REQ_DISCARD)
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#define REQ_WRITE_SAME (1ULL << __REQ_WRITE_SAME)
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#define REQ_NOIDLE (1ULL << __REQ_NOIDLE)
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#define REQ_INTEGRITY (1ULL << __REQ_INTEGRITY)
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#define REQ_FAILFAST_MASK \
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(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
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#define REQ_COMMON_MASK \
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(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
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REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
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REQ_SECURE | REQ_INTEGRITY)
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#define REQ_CLONE_MASK REQ_COMMON_MASK
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#define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME)
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/* This mask is used for both bio and request merge checking */
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#define REQ_NOMERGE_FLAGS \
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(REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | REQ_FLUSH_SEQ)
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#define REQ_RAHEAD (1ULL << __REQ_RAHEAD)
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#define REQ_THROTTLED (1ULL << __REQ_THROTTLED)
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#define REQ_SORTED (1ULL << __REQ_SORTED)
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#define REQ_SOFTBARRIER (1ULL << __REQ_SOFTBARRIER)
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#define REQ_FUA (1ULL << __REQ_FUA)
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#define REQ_NOMERGE (1ULL << __REQ_NOMERGE)
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#define REQ_STARTED (1ULL << __REQ_STARTED)
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#define REQ_DONTPREP (1ULL << __REQ_DONTPREP)
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#define REQ_QUEUED (1ULL << __REQ_QUEUED)
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#define REQ_ELVPRIV (1ULL << __REQ_ELVPRIV)
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#define REQ_FAILED (1ULL << __REQ_FAILED)
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#define REQ_QUIET (1ULL << __REQ_QUIET)
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#define REQ_PREEMPT (1ULL << __REQ_PREEMPT)
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#define REQ_ALLOCED (1ULL << __REQ_ALLOCED)
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#define REQ_COPY_USER (1ULL << __REQ_COPY_USER)
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#define REQ_FLUSH (1ULL << __REQ_FLUSH)
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#define REQ_FLUSH_SEQ (1ULL << __REQ_FLUSH_SEQ)
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#define REQ_IO_STAT (1ULL << __REQ_IO_STAT)
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#define REQ_MIXED_MERGE (1ULL << __REQ_MIXED_MERGE)
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#define REQ_SECURE (1ULL << __REQ_SECURE)
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#define REQ_PM (1ULL << __REQ_PM)
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#define REQ_HASHED (1ULL << __REQ_HASHED)
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#define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT)
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typedef unsigned int blk_qc_t;
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#define BLK_QC_T_NONE -1U
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#define BLK_QC_T_SHIFT 16
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static inline bool blk_qc_t_valid(blk_qc_t cookie)
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{
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return cookie != BLK_QC_T_NONE;
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}
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static inline blk_qc_t blk_tag_to_qc_t(unsigned int tag, unsigned int queue_num)
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{
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return tag | (queue_num << BLK_QC_T_SHIFT);
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}
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static inline unsigned int blk_qc_t_to_queue_num(blk_qc_t cookie)
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{
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return cookie >> BLK_QC_T_SHIFT;
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}
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static inline unsigned int blk_qc_t_to_tag(blk_qc_t cookie)
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{
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return cookie & ((1u << BLK_QC_T_SHIFT) - 1);
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}
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#endif /* __LINUX_BLK_TYPES_H */
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