block: add a struct io_comp_batch argument to fops->iopoll()
struct io_comp_batch contains a list head and a completion handler, which
will allow completions to more effciently completed batches of IO.
For now, no functional changes in this patch, we just define the
io_comp_batch structure and add the argument to the file_operations iopoll
handler.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-core.c b/block/blk-core.c
index 20b6cc0..d0c2e11 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1078,7 +1078,7 @@ EXPORT_SYMBOL(submit_bio);
* Note: the caller must either be the context that submitted @bio, or
* be in a RCU critical section to prevent freeing of @bio.
*/
-int bio_poll(struct bio *bio, unsigned int flags)
+int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags)
{
struct request_queue *q = bio->bi_bdev->bd_disk->queue;
blk_qc_t cookie = READ_ONCE(bio->bi_cookie);
@@ -1096,7 +1096,7 @@ int bio_poll(struct bio *bio, unsigned int flags)
if (WARN_ON_ONCE(!queue_is_mq(q)))
ret = 0; /* not yet implemented, should not happen */
else
- ret = blk_mq_poll(q, cookie, flags);
+ ret = blk_mq_poll(q, cookie, iob, flags);
blk_queue_exit(q);
return ret;
}
@@ -1106,7 +1106,8 @@ EXPORT_SYMBOL_GPL(bio_poll);
* Helper to implement file_operations.iopoll. Requires the bio to be stored
* in iocb->private, and cleared before freeing the bio.
*/
-int iocb_bio_iopoll(struct kiocb *kiocb, unsigned int flags)
+int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
+ unsigned int flags)
{
struct bio *bio;
int ret = 0;
@@ -1134,7 +1135,7 @@ int iocb_bio_iopoll(struct kiocb *kiocb, unsigned int flags)
rcu_read_lock();
bio = READ_ONCE(kiocb->private);
if (bio && bio->bi_bdev)
- ret = bio_poll(bio, flags);
+ ret = bio_poll(bio, iob, flags);
rcu_read_unlock();
return ret;
