linux-kernel - [PATCH v3 09/16] blktrace: add definitions for struct blk_io

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Message-ID: <20251015105435.527088-10-johannes.thumshirn@wdc.com>
Date: Wed, 15 Oct 2025 12:54:28 +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 v3 09/16] blktrace: add definitions for struct blk_io_trace2

Add definitions for the extended version of the blktrace protocol using a
wider action type to be able to record new actions in the kernel.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 include/uapi/linux/blktrace_api.h | 16 ++++++++++++++++
 kernel/trace/blktrace.c           |  1 +
 2 files changed, 17 insertions(+)

diff --git a/include/uapi/linux/blktrace_api.h b/include/uapi/linux/blktrace_api.h
index a6958708d477..3a771b9802aa 100644
--- a/include/uapi/linux/blktrace_api.h
+++ b/include/uapi/linux/blktrace_api.h
@@ -94,6 +94,7 @@ enum blktrace_notify {
 
 #define BLK_IO_TRACE_MAGIC	0x65617400
 #define BLK_IO_TRACE_VERSION	0x07
+#define BLK_IO_TRACE2_VERSION	0x08
 
 /*
  * The trace itself
@@ -113,6 +114,21 @@ struct blk_io_trace {
 	/* cgroup id will be stored here if exists */
 };
 
+struct blk_io_trace2 {
+	__u32 magic;		/* MAGIC << 8 | BLK_IO_TRACE2_VERSION */
+	__u32 sequence;		/* event number */
+	__u64 time;		/* in nanoseconds */
+	__u64 sector;		/* disk offset */
+	__u32 bytes;		/* transfer length */
+	__u32 pid;		/* who did it */
+	__u64 action;		/* what happened */
+	__u32 device;		/* device number */
+	__u32 cpu;		/* on what cpu did it happen */
+	__u16 error;		/* completion error */
+	__u16 pdu_len;		/* length of data after this trace */
+	__u8 pad[12];
+	/* cgroup id will be stored here if exists */
+};
 /*
  * The remap event
  */
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index d1532df84cc8..185f19c9f772 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1616,6 +1616,7 @@ static int __init init_blk_tracer(void)
 
 	BUILD_BUG_ON(__alignof__(struct blk_user_trace_setup2) %
 		     __alignof__(long));
+	BUILD_BUG_ON(__alignof__(struct blk_io_trace2) % __alignof__(long));
 
 	return 0;
 }
-- 
2.51.0