Initial commit

1 files changed, 79 insertions, 0 deletions

diff --git a/blktrace.h b/blktrace.h
new file mode 100644
index 0000000..2f35a45
--- /dev/null
+++ b/blktrace.h
@@ -0,0 +1,79 @@
+#if !defined(__BLKTRACE_H__)
+#define __BLKTRACE_H__ 1
+
+#include <asm/types.h>
+
+enum {
+        BLK_TC_READ     = 1 << 0,       /* reads */
+        BLK_TC_WRITE    = 1 << 1,       /* writes */
+        BLK_TC_BARRIER  = 1 << 2,       /* barrier */
+        BLK_TC_SYNC     = 1 << 3,       /* barrier */
+        BLK_TC_QUEUE    = 1 << 4,       /* queueing/merging */
+        BLK_TC_REQUEUE  = 1 << 5,       /* requeueing */
+        BLK_TC_ISSUE    = 1 << 6,       /* issue */
+        BLK_TC_COMPLETE = 1 << 7,       /* completions */
+        BLK_TC_FS       = 1 << 8,       /* fs requests */
+        BLK_TC_PC       = 1 << 9,       /* pc requests */
+
+        BLK_TC_END      = 1 << 15,      /* only 16-bits, reminder */
+};
+
+#define BLK_TC_SHIFT		(16)
+#define BLK_TC_ACT(act)		((act) << BLK_TC_SHIFT)
+
+/*
+ * Basic trace actions
+ */
+enum {
+	__BLK_TA_QUEUE = 1,		/* queued */
+	__BLK_TA_BACKMERGE,		/* back merged to existing rq */
+	__BLK_TA_FRONTMERGE,		/* front merge to existing rq */
+	__BLK_TA_GETRQ,			/* allocated new request */
+	__BLK_TA_SLEEPRQ,		/* sleeping on rq allocation */
+	__BLK_TA_REQUEUE,		/* request requeued */
+	__BLK_TA_ISSUE,			/* sent to driver */
+	__BLK_TA_COMPLETE,		/* completed by driver */
+};
+
+/*
+ * Trace actions in full. Additionally, read or write is masked
+ */
+#define BLK_TA_QUEUE		(__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_BACKMERGE	(__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_FRONTMERGE	(__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define	BLK_TA_GETRQ		(__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
+#define	BLK_TA_SLEEPRQ		(__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
+#define	BLK_TA_REQUEUE		(__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_ISSUE		(__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
+#define BLK_TA_COMPLETE		(__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
+
+#define BLK_IO_TRACE_MAGIC	(0x65617400)
+#define CHECK_MAGIC(t)		(((t)->magic & 0xffffff00) == BLK_IO_TRACE_MAGIC)
+#define SUPPORTED_VERSION	(0x02)
+
+struct blk_io_trace {
+	__u32 magic;
+	__u32 sequence;
+	__u64 time;
+	__u64 sector;
+	__u32 bytes;
+	__u32 action;
+	__u32 pid;
+	__u16 error;
+	__u16 pdu_len;
+};
+
+struct blk_user_trace_setup {
+	char name[32];
+	__u16 act_mask;
+	__u32 buf_size;
+	__u32 buf_nr;
+};
+
+
+#ifndef BLKSTARTTRACE
+#define BLKSTARTTRACE	_IOWR(0x12,115,struct blk_user_trace_setup)
+#define BLKSTOPTRACE	_IO(0x12,116)
+#endif
+
+#endif