From: adam.manzanares@wdc.com
To: viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
axboe@kernel.dk, bcrl@kvack.org
Cc: mingo@kernel.org, peterz@infradead.org, pombredanne@nexb.com,
gregkh@linuxfoundation.org, bigeasy@linutronix.de,
rgoldwyn@suse.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-aio@kvack.org,
linux-api@vger.kernel.org,
Adam Manzanares <adam.manzanares@wdc.com>
Subject: [PATCH v4 3/3] fs: Add aio iopriority support for block_dev
Date: Thu, 17 May 2018 13:38:03 -0700 [thread overview]
Message-ID: <20180517203803.2664-4-adam.manzanares@wdc.com> (raw)
In-Reply-To: <20180517203803.2664-1-adam.manzanares@wdc.com>
From: Adam Manzanares <adam.manzanares@wdc.com>
This is the per-I/O equivalent of the ioprio_set system call.
When IOCB_FLAG_IOPRIO is set on the iocb aio_flags field, then we set the
newly added kiocb ki_ioprio field to the value in the iocb aio_reqprio field.
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.
This patch depends on block: add ioprio_check_cap function
Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
---
fs/aio.c | 16 ++++++++++++++++
fs/block_dev.c | 2 ++
include/linux/fs.h | 2 ++
include/uapi/linux/aio_abi.h | 1 +
4 files changed, 21 insertions(+)
diff --git a/fs/aio.c b/fs/aio.c
index f3eae5d5771b..ff3107aa82d5 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1451,6 +1451,22 @@ static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
if (iocb->aio_flags & IOCB_FLAG_RESFD)
req->ki_flags |= IOCB_EVENTFD;
req->ki_hint = file_write_hint(req->ki_filp);
+ if (iocb->aio_flags & IOCB_FLAG_IOPRIO) {
+ /*
+ * If the IOCB_FLAG_IOPRIO flag of aio_flags is set, then
+ * aio_reqprio is interpreted as an I/O scheduling
+ * class and priority.
+ */
+ ret = ioprio_check_cap(iocb->aio_reqprio);
+ if (ret) {
+ pr_debug("aio ioprio check cap error\n");
+ return -EINVAL;
+ }
+
+ req->ki_ioprio = iocb->aio_reqprio;
+ req->ki_flags |= IOCB_IOPRIO;
+ }
+
ret = kiocb_set_rw_flags(req, iocb->aio_rw_flags);
if (unlikely(ret))
fput(req->ki_filp);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7ec920e27065..970bef79caa6 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -355,6 +355,8 @@ __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;
+ if (iocb->ki_flags & IOCB_IOPRIO)
+ bio->bi_ioprio = iocb->ki_ioprio;
ret = bio_iov_iter_get_pages(bio, iter);
if (unlikely(ret)) {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7a90ce387e00..3415e83f6350 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -294,6 +294,7 @@ enum rw_hint {
#define IOCB_SYNC (1 << 5)
#define IOCB_WRITE (1 << 6)
#define IOCB_NOWAIT (1 << 7)
+#define IOCB_IOPRIO (1 << 8)
struct kiocb {
struct file *ki_filp;
@@ -302,6 +303,7 @@ struct kiocb {
void *private;
int ki_flags;
u16 ki_hint;
+ u16 ki_ioprio; /* See linux/ioprio.h */
} __randomize_layout;
static inline bool is_sync_kiocb(struct kiocb *kiocb)
diff --git a/include/uapi/linux/aio_abi.h b/include/uapi/linux/aio_abi.h
index 2c0a3415beee..d4e768d55d14 100644
--- a/include/uapi/linux/aio_abi.h
+++ b/include/uapi/linux/aio_abi.h
@@ -55,6 +55,7 @@ enum {
* is valid.
*/
#define IOCB_FLAG_RESFD (1 << 0)
+#define IOCB_FLAG_IOPRIO (1 << 1)
/* read() from /dev/aio returns these structures. */
struct io_event {
--
2.15.1
next prev parent reply other threads:[~2018-05-17 20:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-17 20:38 [PATCH v4 0/3] AIO add per-command iopriority adam.manzanares
2018-05-17 20:38 ` [PATCH v4 1/3] block: add ioprio_check_cap function adam.manzanares
2018-05-18 16:04 ` Christoph Hellwig
2018-05-17 20:38 ` [PATCH v4 2/3] fs: Convert kiocb rw_hint from enum to u16 adam.manzanares
2018-05-18 16:05 ` Christoph Hellwig
2018-05-18 19:53 ` Adam Manzanares
2018-05-17 20:38 ` adam.manzanares [this message]
2018-05-18 15:14 ` [PATCH v4 3/3] fs: Add aio iopriority support for block_dev Jens Axboe
2018-05-18 15:29 ` Adam Manzanares
2018-05-18 16:06 ` Christoph Hellwig
2018-05-18 19:54 ` Adam Manzanares
2018-05-18 20:08 ` kbuild test robot
2018-05-18 2:41 ` [PATCH v4 0/3] AIO add per-command iopriority Jens Axboe
2018-05-18 15:03 ` Adam Manzanares
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