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iomap: wire up the iopoll method

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Store the request queue the last bio was submitted to in the iocb
private data in addition to the cookie so that we find the right block
device.  Also refactor the common direct I/O bio submission code into a
nice little helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Modified to use bio_set_polled().

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2018-12-04 11:12:08 -07:00
committed by Jens Axboe
parent 0bbb280d7b
commit 81214bab58
4 changed files with 32 additions and 15 deletions
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43
fs/iomap.c
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@@ -1464,6 +1464,28 @@ struct iomap_dio {
};
};
int iomap_dio_iopoll(struct kiocb *kiocb, bool spin)
{
struct request_queue *q = READ_ONCE(kiocb->private);
if (!q)
return 0;
return blk_poll(q, READ_ONCE(kiocb->ki_cookie), spin);
}
EXPORT_SYMBOL_GPL(iomap_dio_iopoll);
static void iomap_dio_submit_bio(struct iomap_dio *dio, struct iomap *iomap,
struct bio *bio)
{
atomic_inc(&dio->ref);
if (dio->iocb->ki_flags & IOCB_HIPRI)
bio_set_polled(bio, dio->iocb);
dio->submit.last_queue = bdev_get_queue(iomap->bdev);
dio->submit.cookie = submit_bio(bio);
}
static ssize_t iomap_dio_complete(struct iomap_dio *dio)
{
struct kiocb *iocb = dio->iocb;
@@ -1577,7 +1599,7 @@ static void iomap_dio_bio_end_io(struct bio *bio)
}
}
static blk_qc_t
static void
iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
unsigned len)
{
@@ -1591,15 +1613,10 @@ iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
if (dio->iocb->ki_flags & IOCB_HIPRI)
flags |= REQ_HIPRI;
get_page(page);
__bio_add_page(bio, page, len, 0);
bio_set_op_attrs(bio, REQ_OP_WRITE, flags);
atomic_inc(&dio->ref);
return submit_bio(bio);
iomap_dio_submit_bio(dio, iomap, bio);
}
static loff_t
@@ -1702,9 +1719,6 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
bio_set_pages_dirty(bio);
}
if (dio->iocb->ki_flags & IOCB_HIPRI)
bio->bi_opf |= REQ_HIPRI;
iov_iter_advance(dio->submit.iter, n);
dio->size += n;
@@ -1712,11 +1726,7 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
copied += n;
nr_pages = iov_iter_npages(&iter, BIO_MAX_PAGES);
atomic_inc(&dio->ref);
dio->submit.last_queue = bdev_get_queue(iomap->bdev);
dio->submit.cookie = submit_bio(bio);
iomap_dio_submit_bio(dio, iomap, bio);
} while (nr_pages);
/*
@@ -1927,6 +1937,9 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (dio->flags & IOMAP_DIO_WRITE_FUA)
dio->flags &= ~IOMAP_DIO_NEED_SYNC;
WRITE_ONCE(iocb->ki_cookie, dio->submit.cookie);
WRITE_ONCE(iocb->private, dio->submit.last_queue);
/*
* We are about to drop our additional submission reference, which
* might be the last reference to the dio. There are three three