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block_dev: Fixed direct I/O bio sector calculation 

A direct I/O alignment must be always checked against the device blocks size,
but the I/O offset (bio->bi_iter.bi_sector must always use 512B sector unit, and
not the actual logical block size.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Damien Le Moal 2016-11-22 15:38:49 +09:00 committed by Jens Axboe
parent 778889d841
commit 4d1a476542
1 changed files with 2 additions and 2 deletions
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4
fs/block_dev.c
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@ -226,7 +226,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
bio.bi_max_vecs = nr_pages;
bio.bi_io_vec = vecs;
bio.bi_bdev = bdev;
bio.bi_iter.bi_sector = pos >> blkbits;
bio.bi_iter.bi_sector = pos >> 9;
bio.bi_private = current;
bio.bi_end_io = blkdev_bio_end_io_simple;
@ -358,7 +358,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
for (;;) {
bio->bi_bdev = bdev;
bio->bi_iter.bi_sector = pos >> blkbits;
bio->bi_iter.bi_sector = pos >> 9;
bio->bi_private = dio;
bio->bi_end_io = blkdev_bio_end_io;