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Subject[PATCH 04/11] tracing: add major and minor tags for print format
From: Steven Rostedt <srostedt@redhat.com>

Create the tags <major:field> and <minor:field> for trace format prints.

Given a field (should be of type dev_t) these tags will extract the
major or minor number from the field.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/trace_read_binary.c | 28 +++++++++++++++++++++++++++-
1 files changed, 27 insertions(+), 1 deletions(-)
diff --git a/kernel/trace/trace_read_binary.c b/kernel/trace/trace_read_binary.c
index 4ac31f5..4378350 100644
--- a/kernel/trace/trace_read_binary.c
+++ b/kernel/trace/trace_read_binary.c
@@ -23,7 +23,7 @@ static struct trace_seq buffer;
* COMMAND := <TYPE:FIELD> | <mask:FIELD:DELIM:MASKS> | <sym:FIELD:SYMBOLS> |
* <if:FIELD:TRUE:FALSE> | <ifmask:FIELD:MASK:TRUE:FALSE> |
* <nsec2sec:PRECISION:FIELD> | <nsec2usec:PRECISION:FIELD> |
- * <nsec2msec:PRECISION:FIELD>
+ * <nsec2msec:PRECISION:FIELD> | <major:FIELD> | <minor:FIELD>
* TYPE := int | uint | hex | ptr | string | strarray
* FIELD := defined by the event structure
* MASKS := MASK=NAME,MASKS | MASK=NAME
@@ -59,6 +59,10 @@ static struct trace_seq buffer;
* DELIM will separate the different masks.
* sym : Print out the name of a matching value. This is similar to
* mask, but only one value may print.
+ * major : Given a 'device number' value, this will convert it to its
+ * major number.
+ * minor : Given a 'device number' value, this will convert it to its
+ * minor number.
*/

#define TOK_SIZE 32
@@ -74,6 +78,8 @@ enum field_types {
FIELD_IS_STRING,
FIELD_IS_STRARRAY,
FIELD_IS_HEX,
+ FIELD_IS_MINOR,
+ FIELD_IS_MAJOR,
FIELD_IS_NSEC2SEC,
FIELD_IS_NSEC2USEC,
FIELD_IS_NSEC2MSEC,
@@ -405,6 +411,8 @@ handle_field(struct ftrace_event_call *event,
case FIELD_IS_UINT:
case FIELD_IS_PTR:
case FIELD_IS_HEX:
+ case FIELD_IS_MINOR:
+ case FIELD_IS_MAJOR:
case FIELD_IS_STRING:
case FIELD_IS_STRARRAY:
field = find_field(event, fmt, end - fmt);
@@ -605,6 +613,12 @@ ftrace_initialize_print(struct ftrace_event_call *event, const char *fmt, ...)
else if (strncmp(fmt, "strarray:", 9) == 0)
field_type = FIELD_IS_STRARRAY;

+ else if (strncmp(fmt, "major:", 6) == 0)
+ field_type = FIELD_IS_MAJOR;
+
+ else if (strncmp(fmt, "minor:", 6) == 0)
+ field_type = FIELD_IS_MINOR;
+
else
goto err_format;

@@ -772,6 +786,8 @@ ftrace_read_binary(struct trace_seq *s, struct ftrace_event_call *event,
case FIELD_IS_UINT:
case FIELD_IS_HEX:
case FIELD_IS_PTR:
+ case FIELD_IS_MAJOR:
+ case FIELD_IS_MINOR:
field = info->data.field;
goto skip_if;

@@ -813,6 +829,16 @@ ftrace_read_binary(struct trace_seq *s, struct ftrace_event_call *event,

case FIELD_IS_UINT:
trace_seq_printf(s, "%llu", val);
+ break;
+
+ case FIELD_IS_MAJOR:
+ trace_seq_printf(s, "%u", MAJOR(val));
+ break;
+
+ case FIELD_IS_MINOR:
+ trace_seq_printf(s, "%u", MINOR(val));
+ break;
+
default:
/* hex should only print the size specified */
if (mask)
--
1.6.3.1
--


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