Merge branch 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...

[pandora-kernel.git] / include / linux / blktrace_api.h

diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index cfc3147..d084b8d 100644 (file)
--- 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;
@@ -126,6 +129,7 @@ struct blk_trace {
        u32 dev;
        struct dentry *dir;
        struct dentry *dropped_file;
+       struct dentry *msg_file;
        atomic_t dropped;
 };
 
@@ -149,7 +153,28 @@ 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 +324,8 @@ 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