linux-kernel - [PATCH blktrace v2 14/22] blktrace: pass magic to verify

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Message-ID: <20250925150427.67394-15-johannes.thumshirn@wdc.com>
Date: Thu, 25 Sep 2025 17:04:19 +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 blktrace v2 14/22] blktrace: pass magic to verify_trace

Pass magic to verify_trace(), this will enable verification of multiple
supported versions.

Singed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 blkiomon.c | 2 +-
 blkparse.c | 4 ++--
 blktrace.h | 8 ++++----
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/blkiomon.c b/blkiomon.c
index 05f2d00..373947e 100644
--- a/blkiomon.c
+++ b/blkiomon.c
@@ -488,7 +488,7 @@ static int blkiomon_do_fifo(void)
 
 		/* endianess */
 		trace_to_cpu(bit);
-		if (verify_trace(bit)) {
+		if (verify_trace(bit->magic)) {
 			fprintf(stderr, "blkiomon: bad trace\n");
 			break;
 		}
diff --git a/blkparse.c b/blkparse.c
index 0402e81..9065330 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2509,7 +2509,7 @@ static int read_events(int fd, int always_block, int *fdblock)
 				continue;
 			}
 
-			if (verify_trace(bit)) {
+			if (verify_trace(bit->magic)) {
 				bit_free(bit);
 				bit = NULL;
 				continue;
@@ -2649,7 +2649,7 @@ static int ms_prime(struct ms_stream *msp)
 			if (ret)
 				goto err;
 
-			if (verify_trace(bit))
+			if (verify_trace(bit->magic))
 				goto err;
 
 			if (bit->cpu != pci->cpu) {
diff --git a/blktrace.h b/blktrace.h
index 81a5b51..68c67f2 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -89,16 +89,16 @@ extern struct timespec abs_start_time;
 #error "Bad arch"
 #endif
 
-static inline int verify_trace(struct blk_io_trace *t)
+static inline int verify_trace(__u32 magic)
 {
 	u8 version;
 
-	if (!CHECK_MAGIC(t->magic)) {
-		fprintf(stderr, "bad trace magic %x\n", t->magic);
+	if (!CHECK_MAGIC(magic)) {
+		fprintf(stderr, "bad trace magic %x\n", magic);
 		return 1;
 	}
 
-	version = t->magic & 0xff;
+	version = magic & 0xff;
 	if (version != SUPPORTED_VERSION &&
 	    version != SUPPORTED_VERSION2) {
 		fprintf(stderr, "unsupported trace version %x\n", version);
-- 
2.51.0