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block: introduce bio_clone_bioset_partial()
md still need bio clone(not the fast version) for behind write, and it is more efficient to use bio_clone_bioset_partial(). The idea is simple and just copy the bvecs range specified from parameters. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Shaohua Li <shli@fb.com>
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c18a1e0900
61
block/bio.c
61
block/bio.c
@ -625,21 +625,20 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs)
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}
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EXPORT_SYMBOL(bio_clone_fast);
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/**
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* bio_clone_bioset - clone a bio
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* @bio_src: bio to clone
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* @gfp_mask: allocation priority
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* @bs: bio_set to allocate from
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*
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* Clone bio. Caller will own the returned bio, but not the actual data it
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* points to. Reference count of returned bio will be one.
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*/
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struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
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struct bio_set *bs)
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static struct bio *__bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
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struct bio_set *bs, int offset,
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int size)
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{
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struct bvec_iter iter;
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struct bio_vec bv;
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struct bio *bio;
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struct bvec_iter iter_src = bio_src->bi_iter;
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/* for supporting partial clone */
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if (offset || size != bio_src->bi_iter.bi_size) {
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bio_advance_iter(bio_src, &iter_src, offset);
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iter_src.bi_size = size;
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}
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/*
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* Pre immutable biovecs, __bio_clone() used to just do a memcpy from
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@ -663,7 +662,8 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
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* __bio_clone_fast() anyways.
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*/
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bio = bio_alloc_bioset(gfp_mask, bio_segments(bio_src), bs);
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bio = bio_alloc_bioset(gfp_mask, __bio_segments(bio_src,
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&iter_src), bs);
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if (!bio)
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return NULL;
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bio->bi_bdev = bio_src->bi_bdev;
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@ -680,7 +680,7 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
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bio->bi_io_vec[bio->bi_vcnt++] = bio_src->bi_io_vec[0];
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break;
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default:
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bio_for_each_segment(bv, bio_src, iter)
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__bio_for_each_segment(bv, bio_src, iter, iter_src)
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bio->bi_io_vec[bio->bi_vcnt++] = bv;
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break;
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}
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@ -699,8 +699,43 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
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return bio;
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}
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/**
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* bio_clone_bioset - clone a bio
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* @bio_src: bio to clone
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* @gfp_mask: allocation priority
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* @bs: bio_set to allocate from
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*
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* Clone bio. Caller will own the returned bio, but not the actual data it
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* points to. Reference count of returned bio will be one.
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*/
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struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask,
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struct bio_set *bs)
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{
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return __bio_clone_bioset(bio_src, gfp_mask, bs, 0,
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bio_src->bi_iter.bi_size);
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}
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EXPORT_SYMBOL(bio_clone_bioset);
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/**
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* bio_clone_bioset_partial - clone a partial bio
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* @bio_src: bio to clone
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* @gfp_mask: allocation priority
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* @bs: bio_set to allocate from
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* @offset: cloned starting from the offset
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* @size: size for the cloned bio
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*
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* Clone bio. Caller will own the returned bio, but not the actual data it
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* points to. Reference count of returned bio will be one.
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*/
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struct bio *bio_clone_bioset_partial(struct bio *bio_src, gfp_t gfp_mask,
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struct bio_set *bs, int offset,
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int size)
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{
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return __bio_clone_bioset(bio_src, gfp_mask, bs, offset, size);
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}
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EXPORT_SYMBOL(bio_clone_bioset_partial);
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/**
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* bio_add_pc_page - attempt to add page to bio
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* @q: the target queue
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@ -183,7 +183,7 @@ static inline void bio_advance_iter(struct bio *bio, struct bvec_iter *iter,
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#define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
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static inline unsigned bio_segments(struct bio *bio)
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static inline unsigned __bio_segments(struct bio *bio, struct bvec_iter *bvec)
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{
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unsigned segs = 0;
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struct bio_vec bv;
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@ -205,12 +205,17 @@ static inline unsigned bio_segments(struct bio *bio)
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break;
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}
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bio_for_each_segment(bv, bio, iter)
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__bio_for_each_segment(bv, bio, iter, *bvec)
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segs++;
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return segs;
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}
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static inline unsigned bio_segments(struct bio *bio)
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{
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return __bio_segments(bio, &bio->bi_iter);
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}
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/*
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* get a reference to a bio, so it won't disappear. the intended use is
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* something like:
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@ -384,6 +389,8 @@ extern void bio_put(struct bio *);
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extern void __bio_clone_fast(struct bio *, struct bio *);
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extern struct bio *bio_clone_fast(struct bio *, gfp_t, struct bio_set *);
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extern struct bio *bio_clone_bioset(struct bio *, gfp_t, struct bio_set *bs);
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extern struct bio *bio_clone_bioset_partial(struct bio *, gfp_t,
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struct bio_set *, int, int);
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extern struct bio_set *fs_bio_set;
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