linux-kernel - [PATCH] uapi: linux/blkzoned.h: fix BLKGETZONESZ and BLKGETNRZONES definitions

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Message-ID: <20181216014951.GA14229@altlinux.org>
Date:   Sun, 16 Dec 2018 04:49:52 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Jens Axboe <axboe@...nel.dk>,
        Damien Le Moal <damien.lemoal@....com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] uapi: linux/blkzoned.h: fix BLKGETZONESZ and BLKGETNRZONES
 definitions

According to the documentation in include/uapi/asm-generic/ioctl.h,
_IOW means userspace is writing and kernel is reading, and
_IOR means userspace is reading and kernel is writing.

In case of these two ioctls, kernel is writing and userspace is reading,
so they have to be _IOR instead of _IOW.

Fixes: 72cd87576d1d8 ("block: Introduce BLKGETZONESZ ioctl")
Fixes: 65e4e3eee83d7 ("block: Introduce BLKGETNRZONES ioctl")
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---

Since both ioctls were introduced after 4.19,
please make sure they are fixed in 4.20.
Thanks.

 include/uapi/linux/blkzoned.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/blkzoned.h b/include/uapi/linux/blkzoned.h
index 8f08ff9bdea0..6fa38d001d84 100644
--- a/include/uapi/linux/blkzoned.h
+++ b/include/uapi/linux/blkzoned.h
@@ -141,7 +141,7 @@ struct blk_zone_range {
  */
 #define BLKREPORTZONE	_IOWR(0x12, 130, struct blk_zone_report)
 #define BLKRESETZONE	_IOW(0x12, 131, struct blk_zone_range)
-#define BLKGETZONESZ	_IOW(0x12, 132, __u32)
-#define BLKGETNRZONES	_IOW(0x12, 133, __u32)
+#define BLKGETZONESZ	_IOR(0x12, 132, __u32)
+#define BLKGETNRZONES	_IOR(0x12, 133, __u32)
 
 #endif /* _UAPI_BLKZONED_H */
-- 
ldv