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block_dev: propagate bio_iov_iter_get_pages error in __blkdev_direct_IO

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Once we move the block layer to its own status code we'll still want to
propagate the bio_iov_iter_get_pages, so restructure __blkdev_direct_IO
to take ret into account when returning the errno.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-06-03 09:38:00 +02:00 committed by Jens Axboe
parent d5245d7674
commit 36ffc6c1c0
1 changed files with 4 additions and 3 deletions
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7
fs/block_dev.c
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@ -334,7 +334,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
bool is_read = (iov_iter_rw(iter) == READ), is_sync;
loff_t pos = iocb->ki_pos;
blk_qc_t qc = BLK_QC_T_NONE;
int ret;
int ret = 0;
if ((pos | iov_iter_alignment(iter)) &
(bdev_logical_block_size(bdev) - 1))
@ -363,7 +363,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
ret = bio_iov_iter_get_pages(bio, iter);
if (unlikely(ret)) {
bio->bi_error = ret;
bio->bi_error = -EIO;
bio_endio(bio);
break;
}
@ -412,7 +412,8 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
}
__set_current_state(TASK_RUNNING);
ret = dio->bio.bi_error;
if (!ret)
ret = dio->bio.bi_error;
if (likely(!ret))
ret = dio->size;