block: kill unused polling bits in __blkdev_direct_IO()

With addition of __blkdev_direct_IO_async(), __blkdev_direct_IO() now
serves only multio-bio I/O, which we don't poll. Now we can remove
anything related to I/O polling from it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b8c597a6b7ee612df394853bfd24726aee5b898e.1635337135.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/fops.c b/block/fops.c
index 092e507..983e993 100644 (file)
--- a/block/fops.c
+++ b/block/fops.c
@@ -190,7 +190,6 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
        struct blk_plug plug;
        struct blkdev_dio *dio;
        struct bio *bio;
-       bool do_poll = (iocb->ki_flags & IOCB_HIPRI);
        bool is_read = (iov_iter_rw(iter) == READ), is_sync;
        loff_t pos = iocb->ki_pos;
        int ret = 0;
@@ -216,12 +215,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
        if (is_read && iter_is_iovec(iter))
                dio->flags |= DIO_SHOULD_DIRTY;
 
-       /*
-        * Don't plug for HIPRI/polled IO, as those should go straight
-        * to issue
-        */
-       if (!(iocb->ki_flags & IOCB_HIPRI))
-               blk_start_plug(&plug);
+       blk_start_plug(&plug);
 
        for (;;) {
                bio_set_dev(bio, bdev);
@@ -254,11 +248,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
 
                nr_pages = bio_iov_vecs_to_alloc(iter, BIO_MAX_VECS);
                if (!nr_pages) {
-                       if (do_poll)
-                               bio_set_polled(bio, iocb);
                        submit_bio(bio);
-                       if (do_poll)
-                               WRITE_ONCE(iocb->private, bio);
                        break;
                }
                if (!(dio->flags & DIO_MULTI_BIO)) {
@@ -271,7 +261,6 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
                                bio_get(bio);
                        dio->flags |= DIO_MULTI_BIO;
                        atomic_set(&dio->ref, 2);
-                       do_poll = false;
                } else {
                        atomic_inc(&dio->ref);
                }
@@ -280,8 +269,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
                bio = bio_alloc(GFP_KERNEL, nr_pages);
        }
 
-       if (!(iocb->ki_flags & IOCB_HIPRI))
-               blk_finish_plug(&plug);
+       blk_finish_plug(&plug);
 
        if (!is_sync)
                return -EIOCBQUEUED;
@@ -290,9 +278,7 @@ static ssize_t __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
                set_current_state(TASK_UNINTERRUPTIBLE);
                if (!READ_ONCE(dio->waiter))
                        break;
-
-               if (!do_poll || !bio_poll(bio, NULL, 0))
-                       blk_io_schedule();
+               blk_io_schedule();
        }
        __set_current_state(TASK_RUNNING);