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block: Add bio_advance()

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This is prep work for immutable bio vecs; we first want to centralize
where bvecs are modified.

Next two patches convert some existing code to use this function.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2012-09-28 13:17:55 -07:00
parent 9f060e2231
commit 054bdf646e
3 changed files with 45 additions and 0 deletions
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2
include/linux/bio.h
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@ -248,6 +248,8 @@ extern void bio_endio(struct bio *, int);
struct request_queue;
extern int bio_phys_segments(struct request_queue *, struct bio *);
extern void bio_advance(struct bio *, unsigned);
extern void bio_init(struct bio *);
extern void bio_reset(struct bio *);

2
include/linux/blk_types.h
View file

@ -197,6 +197,8 @@ enum rq_flag_bits {
REQ_SECURE)
#define REQ_CLONE_MASK REQ_COMMON_MASK
#define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME)
/* This mask is used for both bio and request merge checking */
#define REQ_NOMERGE_FLAGS \
(REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA)