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Date: Tue, 27 May 2008 08:44:06 -0400
From: "Alan D. Brunelle" <Alan.Brunelle@...com>
To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Jens Axboe <jens.axboe@...cle.com>, linux-btrace@...r.kernel.org
Subject: [PATCH 1/2] Added in MESSAGE notes for blktraces
Allows messages to be inserted into blktrace streams.
Associated blkparse patches will be posted to linux-btrace & may also be
found at:
http://free.linux.hp.com/~adb/blktrace/0001-Added-in-handling-of-MESSAGE-notes.patch
http://free.linux.hp.com/~adb/blktrace/0002-Added-in-new-message-updates-to-the-documentation.patch
Signed-off-by: Alan D. Brunelle <alan.brunelle@...com>
---
block/blktrace.c | 14 ++++++++++++++
include/linux/blktrace_api.h | 25 +++++++++++++++++++++++++
2 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/block/blktrace.c b/block/blktrace.c
index b2cbb4e..20e11f3 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -75,6 +75,20 @@ static void trace_note_time(struct blk_trace *bt)
local_irq_restore(flags);
}
+void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
+{
+ int n;
+ va_list args;
+ static char bt_msg_buf[BLK_TN_MAX_MSG];
+
+ va_start(args, fmt);
+ n = vscnprintf(bt_msg_buf, BLK_TN_MAX_MSG, fmt, args);
+ va_end(args);
+
+ trace_note(bt, 0, BLK_TN_MESSAGE, bt_msg_buf, n);
+}
+EXPORT_SYMBOL_GPL(__trace_note_message);
+
static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
pid_t pid)
{
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index cfc3147..b7cd8f1 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -55,6 +55,7 @@ enum blktrace_act {
enum blktrace_notify {
__BLK_TN_PROCESS = 0, /* establish pid/name mapping */
__BLK_TN_TIMESTAMP, /* include system clock */
+ __BLK_TN_MESSAGE, /* Character string message */
};
@@ -79,6 +80,7 @@ enum blktrace_notify {
#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
+#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_IO_TRACE_MAGIC 0x65617400
#define BLK_IO_TRACE_VERSION 0x07
@@ -149,7 +151,28 @@ extern void blk_trace_shutdown(struct request_queue *);
extern void __blk_add_trace(struct blk_trace *, sector_t, int, int,
u32, int, int, void *);
extern int do_blk_trace_setup(struct request_queue *q,
char *name, dev_t dev, struct blk_user_trace_setup *buts);
+extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);
+/**
+ * blk_add_trace_msg - Add a (simple) message to the blktrace stream
+ * @q: queue the io is for
+ * @fmt: format to print message in
+ * args... Variable argument list for format
+ *
+ * Description:
+ * Records a (simple) message onto the blktrace stream.
+ *
+ * NOTE: BLK_TN_MAX_MSG characters are output at most.
+ * NOTE: Can not use 'static inline' due to presence of var args...
+ *
+ **/
+#define blk_add_trace_msg(q, fmt, ...) \
+ do { \
+ struct blk_trace *bt = (q)->blk_trace; \
+ if (unlikely(bt)) \
+ __trace_note_message(bt, fmt, ##__VA_ARGS__); \
+ } while (0)
+#define BLK_TN_MAX_MSG 1024
/**
* blk_add_trace_rq - Add a trace for a request oriented action
@@ -299,6 +322,8 @@ extern int blk_trace_remove(struct request_queue *q);
#define blk_trace_setup(q, name, dev, arg) (-ENOTTY)
#define blk_trace_startstop(q, start) (-ENOTTY)
#define blk_trace_remove(q) (-ENOTTY)
+#define blk_add_trace_msg(q, fmt, ...) do { } while (0)
+
#endif /* CONFIG_BLK_DEV_IO_TRACE */
#endif /* __KERNEL__ */
#endif
--
1.5.4.3
--
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