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block: bio: pass bvec table to bio_init()

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Some drivers often use external bvec table, so introduce
this helper for this case. It is always safe to access the
bio->bi_io_vec in this way for this case.

After converting to this usage, it will becomes a bit easier
to evaluate the remaining direct access to bio->bi_io_vec,
so it can help to prepare for the following multipage bvec
support.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Fixed up the new O_DIRECT cases.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei
2016-11-22 08:57:21 -07:00
committed by Jens Axboe
parent 9a794fb9bd
commit 3a83f46775
17 changed files with 28 additions and 50 deletions
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4
drivers/md/bcache/io.c
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@@ -24,9 +24,7 @@ struct bio *bch_bbio_alloc(struct cache_set *c)
struct bbio *b = mempool_alloc(c->bio_meta, GFP_NOIO);
struct bio *bio = &b->bio;
bio_init(bio);
bio->bi_max_vecs = bucket_pages(c);
bio->bi_io_vec = bio->bi_inline_vecs;
bio_init(bio, bio->bi_inline_vecs, bucket_pages(c));
return bio;
}