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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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2
drivers/md/dm.c
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@@ -1525,7 +1525,7 @@ static struct mapped_device *alloc_dev(int minor)
if (!md->bdev)
goto bad;
bio_init(&md->flush_bio);
bio_init(&md->flush_bio, NULL, 0);
md->flush_bio.bi_bdev = md->bdev;
md->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;