From 0d8627cc936de8ea04f3cc1e6921c63fb72cc199 Mon Sep 17 00:00:00 2001
From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Date: Wed, 22 Oct 2025 13:41:06 +0200
Subject: blktrace: add definitions for blk_user_trace_setup2

Add definitions for a version 2 of the blk_user_trace_setup ioctl. This
new ioctl will enable a different struct layout of the binary data passed
to user-space when using a new version of the blktrace utility requesting
the new struct layout.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 kernel/trace/blktrace.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'kernel')

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index df90422ae613..c31b8f433116 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1601,6 +1601,9 @@ static int __init init_blk_tracer(void)
 		return 1;
 	}
 
+	BUILD_BUG_ON(__alignof__(struct blk_user_trace_setup2) %
+		     __alignof__(long));
+
 	return 0;
 }
 
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