linux-kernel - [PATCH v6 3/8] tracing/probes: support '%pd' type for fprobe

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Date: Fri, 15 Mar 2024 14:55:35 +0800
From: Ye Bin <yebin10@...wei.com>
To: <rostedt@...dmis.org>, <mhiramat@...nel.org>,
	<mathieu.desnoyers@...icios.com>, <linux-trace-kernel@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <yebin10@...wei.com>
Subject: [PATCH v6 3/8] tracing/probes: support '%pd' type for fprobe

Support print type '%pd' for print dentry's or file's name.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 kernel/trace/trace_fprobe.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c
index 7d2ddbcfa377..988d68e906ad 100644
--- a/kernel/trace/trace_fprobe.c
+++ b/kernel/trace/trace_fprobe.c
@@ -976,6 +976,7 @@ static int __trace_fprobe_create(int argc, const char *argv[])
 	char gbuf[MAX_EVENT_NAME_LEN];
 	char sbuf[KSYM_NAME_LEN];
 	char abuf[MAX_BTF_ARGS_LEN];
+	char *dbuf = NULL;
 	bool is_tracepoint = false;
 	struct tracepoint *tpoint = NULL;
 	struct traceprobe_parse_context ctx = {
@@ -1086,6 +1087,10 @@ static int __trace_fprobe_create(int argc, const char *argv[])
 		argv = new_argv;
 	}
 
+	ret = traceprobe_expand_dentry_args(argc, argv, &dbuf);
+	if (ret)
+		goto out;
+
 	/* setup a probe */
 	tf = alloc_trace_fprobe(group, event, symbol, tpoint, maxactive,
 				argc, is_return);
@@ -1131,6 +1136,7 @@ static int __trace_fprobe_create(int argc, const char *argv[])
 	trace_probe_log_clear();
 	kfree(new_argv);
 	kfree(symbol);
+	kfree(dbuf);
 	return ret;
 
 parse_error:
-- 
2.31.1