From: Pavel Begunkov <asml.silence@gmail.com>
To: linux-block@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
Pavel Begunkov <asml.silence@gmail.com>
Subject: [PATCH v2 2/4] block: kill unused polling bits in __blkdev_direct_IO()
Date: Wed, 27 Oct 2021 13:21:08 +0100 [thread overview]
Message-ID: <b8c597a6b7ee612df394853bfd24726aee5b898e.1635337135.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1635337135.git.asml.silence@gmail.com>
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>
---
block/fops.c | 20 +++-----------------
1 file changed, 3 insertions(+), 17 deletions(-)
diff --git a/block/fops.c b/block/fops.c
index 092e5079e827..983e993c9a4b 100644
--- 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);
--
2.33.1
next prev parent reply other threads:[~2021-10-27 12:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 12:21 [PATCH v2 0/4] block optimisations Pavel Begunkov
2021-10-27 12:21 ` [PATCH v2 1/4] block: avoid extra iter advance with async iocb Pavel Begunkov
2021-10-27 12:21 ` Pavel Begunkov [this message]
2021-10-27 12:21 ` [PATCH v2 3/4] block: kill DIO_MULTI_BIO Pavel Begunkov
2021-10-27 12:21 ` [PATCH v2 4/4] block: add async version of bio_set_polled Pavel Begunkov
2021-10-27 16:28 ` [PATCH v2 0/4] block optimisations Jens Axboe
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