linux-kernel - [PATCH v2 07/15] blktrace: add definitions for blk_user_trace

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Message-ID: <20250925150231.67342-8-johannes.thumshirn@wdc.com>
Date: Thu, 25 Sep 2025 17:02:23 +0200
From: Johannes Thumshirn <johannes.thumshirn@....com>
To: Jens Axboe <axboe@...nel.dk>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-btrace@...r.kernel.org,
	John Garry <john.g.garry@...cle.com>,
	Hannes Reinecke <hare@...e.de>,
	Damien Le Moal <dlemoal@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Naohiro Aota <naohiro.aota@....com>,
	Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
	Chaitanya Kulkarni <chaitanyak@...dia.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v2 07/15] blktrace: add definitions for blk_user_trace_setup2

Add definitions for a version 2 of the blk_user_trace_setup ioctl. This
new 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.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 include/uapi/linux/blktrace_api.h | 15 +++++++++++++++
 include/uapi/linux/fs.h           |  1 +
 2 files changed, 16 insertions(+)

diff --git a/include/uapi/linux/blktrace_api.h b/include/uapi/linux/blktrace_api.h
index 1bfb635e309b..a3b1f35ac026 100644
--- a/include/uapi/linux/blktrace_api.h
+++ b/include/uapi/linux/blktrace_api.h
@@ -143,4 +143,19 @@ struct blk_user_trace_setup {
 	__u32 pid;
 };
 
+/*
+ * User setup structure passed with BLKTRACESETUP2
+ */
+struct blk_user_trace_setup2 {
+	char name[32];		/* 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[7];
+};
+
 #endif /* _UAPIBLKTRACE_H */
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 0bd678a4a10e..a85d0b52a3f6 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -300,6 +300,7 @@ struct file_attr {
 #define BLKGETDISKSEQ _IOR(0x12,128,__u64)
 /* 130-136 are used by zoned block device ioctls (uapi/linux/blkzoned.h) */
 /* 137-141 are used by blk-crypto ioctls (uapi/linux/blk-crypto.h) */
+#define BLKTRACESETUP2 _IOWR(0x12, 142, struct blk_user_trace_setup2)
 
 #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
 #define FIBMAP	   _IO(0x00,1)	/* bmap access */
-- 
2.51.0