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tracing/filters: Add filter_type to struct ftrace_event_field

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The type of a field is stored as a string in @type, and here
we add @filter_type which is an enum value.

This prepares for later patches, so we can specifically assign
different @filter_type for the same @type.

For example normally a "char *" field is treated as a ptr,
but we may want it to be treated as a string when doing filting.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A7B925E.9030605@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan 2009-08-07 10:33:02 +08:00 committed by Steven Rostedt
parent 6591b49387
commit aa38e9fc3e
3 changed files with 18 additions and 9 deletions
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2
kernel/trace/trace.h
View File

@ -755,6 +755,7 @@ struct ftrace_event_field {
struct list_head link;
char *name;
char *type;
int filter_type;
int offset;
int size;
int is_signed;
@ -800,6 +801,7 @@ extern int apply_subsystem_event_filter(struct event_subsystem *system,
char *filter_string);
extern void print_subsystem_event_filter(struct event_subsystem *system,
struct trace_seq *s);
extern int filter_assign_type(const char *type);
static inline int
filter_check_discard(struct ftrace_event_call *call, void *rec,

2
kernel/trace/trace_events.c
View File

@ -44,9 +44,11 @@ int trace_define_field(struct ftrace_event_call *call, const char *type,
if (!field->type)
goto err;
field->filter_type = filter_assign_type(type);
field->offset = offset;
field->size = size;
field->is_signed = is_signed;
list_add(&field->link, &call->fields);
return 0;

23
kernel/trace/trace_events_filter.c
View File

@ -476,11 +476,12 @@ static int filter_add_pred_fn(struct filter_parse_state *ps,
}
enum {
FILTER_STATIC_STRING = 1,
FILTER_DYN_STRING
FILTER_OTHER = 0,
FILTER_STATIC_STRING,
FILTER_DYN_STRING,
};
static int is_string_field(const char *type)
int filter_assign_type(const char *type)
{
if (strstr(type, "__data_loc") && strstr(type, "char"))
return FILTER_DYN_STRING;
@ -488,12 +489,18 @@ static int is_string_field(const char *type)
if (strchr(type, '[') && strstr(type, "char"))
return FILTER_STATIC_STRING;
return 0;
return FILTER_OTHER;
}
static bool is_string_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_DYN_STRING ||
field->filter_type == FILTER_STATIC_STRING;
}
static int is_legal_op(struct ftrace_event_field *field, int op)
{
if (is_string_field(field->type) && (op != OP_EQ && op != OP_NE))
if (is_string_field(field) && (op != OP_EQ && op != OP_NE))
return 0;
return 1;
@ -550,7 +557,6 @@ static int filter_add_pred(struct filter_parse_state *ps,
struct ftrace_event_field *field;
filter_pred_fn_t fn;
unsigned long long val;
int string_type;
int ret;
pred->fn = filter_pred_none;
@ -578,9 +584,8 @@ static int filter_add_pred(struct filter_parse_state *ps,
return -EINVAL;
}
string_type = is_string_field(field->type);
if (string_type) {
if (string_type == FILTER_STATIC_STRING)
if (is_string_field(field)) {
if (field->filter_type == FILTER_STATIC_STRING)
fn = filter_pred_string;
else
fn = filter_pred_strloc;