linux-kernel - [PATCH blktrace v3 03/20] blktrace: add definitions for BLKTRACESETUP2

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Message-ID: <20251015105658.527262-4-johannes.thumshirn@wdc.com>
Date: Wed, 15 Oct 2025 12:56:41 +0200
From: Johannes Thumshirn <johannes.thumshirn@....com>
To: axboe@...nel.dk
Cc: chaitanyak@...dia.com,
	dlemoal@...nel.org,
	hare@...e.de,
	hch@....de,
	john.g.garry@...cle.com,
	linux-block@...r.kernel.org,
	linux-btrace@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	martin.petersen@...cle.com,
	mathieu.desnoyers@...icios.com,
	mhiramat@...nel.org,
	naohiro.aota@....com,
	rostedt@...dmis.org,
	shinichiro.kawasaki@....com,
	Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH blktrace v3 03/20] blktrace: add definitions for BLKTRACESETUP2

Add definitions for a new BLKTRACESETUP2 ioctl(2).

This new ioctl(2) will request a new, updated structure layout from the
kernel which enhances the storage size of the 'action' field in order to
store additional tracepoints.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 blktrace_api.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/blktrace_api.h b/blktrace_api.h
index 172b4c2..ecffe6e 100644
--- a/blktrace_api.h
+++ b/blktrace_api.h
@@ -139,9 +139,25 @@ struct blk_user_trace_setup {
 	__u32 pid;
 };
 
+/*
+ * User setup structure passed with BLKTRACESETUP2
+ */
+struct blk_user_trace_setup2 {
+	char name[64];			/* output */
+	__u64 act_mask;			/* input */
+	__u32 buf_size;			/* input */
+	__u32 buf_nr;			/* input */
+	__u64 start_lba;
+	__u64 end_lba;
+	__u32 pid;
+	__u32 flags;			/* currently unused */
+	__u64 reserved[11];
+};
+
 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
 #define BLKTRACESTART _IO(0x12,116)
 #define BLKTRACESTOP _IO(0x12,117)
 #define BLKTRACETEARDOWN _IO(0x12,118)
+#define BLKTRACESETUP2 _IOWR(0x12, 142, struct blk_user_trace_setup2)
 
 #endif
-- 
2.51.0