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Subject[PATCH 2/2] fs: Add aio priority support for block_dev
Date
From: Adam Manzanares <adam.manzanares@wdc.com>

When the IOCB_IOPRIO flag is set because the user supplied iocb
has the RWF_IOPRIO flag is set then we set the priority value of
the kiocb from the iocb.

When a bio is created for an aio request by the block dev we set the
priority value of the bio to the user supplied value.

Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
---
fs/aio.c | 9 +++++++++
fs/block_dev.c | 1 +
2 files changed, 10 insertions(+)

diff --git a/fs/aio.c b/fs/aio.c
index 88d7927ffbc6..47591f9e7ba3 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1603,6 +1603,15 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
goto out_put_req;
}

+ if (req->common.ki_flags & IOCB_IOPRIO)
+ /*
+ * The IOCB_IOPRIO flag is set when the user supplied iocb
+ * aio_rw_flag field has the RWF_IOPRIO flag set. If so,
+ * aio_reqprio is interpreted as a I/O scheduling class and
+ * priority.
+ */
+ req->common.ki_ioprio = iocb->aio_reqprio;
+
ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
if (unlikely(ret)) {
pr_debug("EFAULT: aio_key\n");
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7ec920e27065..da1e94d2bb75 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -355,6 +355,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages)
bio->bi_write_hint = iocb->ki_hint;
bio->bi_private = dio;
bio->bi_end_io = blkdev_bio_end_io;
+ bio->bi_ioprio = iocb->ki_ioprio;

ret = bio_iov_iter_get_pages(bio, iter);
if (unlikely(ret)) {
--
2.15.1
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