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block: remove the bi_phys_segments field in struct bio

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We only need the number of segments in the blk-mq submission path.
Remove the field from struct bio, and return it from a variant of
blk_queue_split instead of that it can passed as an argument to
those functions that need the value.

This also means we stop recounting segments except for cloning
and partial segments.

To keep the number of arguments in this how path down remove
pointless struct request_queue arguments from any of the functions
that had it and grew a nr_segs argument.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-06-06 12:29:01 +02:00 • committed by Jens Axboe
commit 14ccb66b3f
18 changed files with 106 additions and 137 deletions
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15
block/bio.c
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@ -558,14 +558,6 @@ void bio_put(struct bio *bio)
}
EXPORT_SYMBOL(bio_put);
int bio_phys_segments(struct request_queue *q, struct bio *bio)
{
if (unlikely(!bio_flagged(bio, BIO_SEG_VALID)))
blk_recount_segments(q, bio);
return bio->bi_phys_segments;
}
/**
* __bio_clone_fast - clone a bio that shares the original bio's biovec
* @bio: destination bio
@ -739,7 +731,7 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
if (bio_full(bio))
return 0;
if (bio->bi_phys_segments >= queue_max_segments(q))
if (bio->bi_vcnt >= queue_max_segments(q))
return 0;
bvec = &bio->bi_io_vec[bio->bi_vcnt];
@ -749,8 +741,6 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
bio->bi_vcnt++;
done:
bio->bi_iter.bi_size += len;
bio->bi_phys_segments = bio->bi_vcnt;
bio_set_flag(bio, BIO_SEG_VALID);
return len;
}
@ -1909,10 +1899,7 @@ void bio_trim(struct bio *bio, int offset, int size)
if (offset == 0 && size == bio->bi_iter.bi_size)
return;
bio_clear_flag(bio, BIO_SEG_VALID);
bio_advance(bio, offset << 9);
bio->bi_iter.bi_size = size;
if (bio_integrity(bio))