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-rw-r--r--include/linux/blktrace_api.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index cfc3147e5cf..e3ef903aae8 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
@@ -119,6 +121,7 @@ struct blk_trace {
int trace_state;
struct rchan *rchan;
unsigned long *sequence;
+ unsigned char *msg_data;
u16 act_mask;
u64 start_lba;
u64 end_lba;
@@ -149,7 +152,28 @@ 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 128
/**
* blk_add_trace_rq - Add a trace for a request oriented action
@@ -299,6 +323,8 @@ 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