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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
fs/block_dev.c
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@ -222,9 +222,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
return -ENOMEM;
}
bio_init(&bio);
bio.bi_max_vecs = nr_pages;
bio.bi_io_vec = vecs;
bio_init(&bio, vecs, nr_pages);
bio.bi_bdev = bdev;
bio.bi_iter.bi_sector = pos >> 9;
bio.bi_private = current;