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tracing/filters: Use a different op for glob match

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"==" will always do a full match, and "~" will do a glob match.

In the future, we may add "=~" for regex match.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4AD69528.3050309@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-10-15 11:21:12 +08:00 committed by Ingo Molnar
parent fce29d15b5
commit b0f1a59a98
2 changed files with 28 additions and 31 deletions
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2
kernel/trace/trace.h
View file

@ -702,7 +702,7 @@ typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
typedef int (*regex_match_func)(char *str, struct regex *r, int len);
enum regex_type {
MATCH_FULL,
MATCH_FULL = 0,
MATCH_FRONT_ONLY,
MATCH_MIDDLE_ONLY,
MATCH_END_ONLY,

57
kernel/trace/trace_events_filter.c
View file

@ -29,6 +29,7 @@ enum filter_op_ids
{
OP_OR,
OP_AND,
OP_GLOB,
OP_NE,
OP_EQ,
OP_LT,
@ -46,16 +47,17 @@ struct filter_op {
};
static struct filter_op filter_ops[] = {
{ OP_OR, "||", 1 },
{ OP_AND, "&&", 2 },
{ OP_NE, "!=", 4 },
{ OP_EQ, "==", 4 },
{ OP_LT, "<", 5 },
{ OP_LE, "<=", 5 },
{ OP_GT, ">", 5 },
{ OP_GE, ">=", 5 },
{ OP_NONE, "OP_NONE", 0 },
{ OP_OPEN_PAREN, "(", 0 },
{ OP_OR, "||", 1 },
{ OP_AND, "&&", 2 },
{ OP_GLOB, "~", 4 },
{ OP_NE, "!=", 4 },
{ OP_EQ, "==", 4 },
{ OP_LT, "<", 5 },
{ OP_LE, "<=", 5 },
{ OP_GT, ">", 5 },
{ OP_GE, ">=", 5 },
{ OP_NONE, "OP_NONE", 0 },
{ OP_OPEN_PAREN, "(", 0 },
};
enum {
@ -329,22 +331,18 @@ enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not)
return type;
}
static int filter_build_regex(struct filter_pred *pred)
static void filter_build_regex(struct filter_pred *pred)
{
struct regex *r = &pred->regex;
char *search, *dup;
enum regex_type type;
int not;
char *search;
enum regex_type type = MATCH_FULL;
int not = 0;
type = filter_parse_regex(r->pattern, r->len, &search, &not);
dup = kstrdup(search, GFP_KERNEL);
if (!dup)
return -ENOMEM;
strcpy(r->pattern, dup);
kfree(dup);
r->len = strlen(r->pattern);
if (pred->op == OP_GLOB) {
type = filter_parse_regex(r->pattern, r->len, &search, &not);
r->len = strlen(search);
memmove(r->pattern, search, r->len+1);
}
switch (type) {
case MATCH_FULL:
@ -362,8 +360,6 @@ static int filter_build_regex(struct filter_pred *pred)
}
pred->not ^= not;
return 0;
}
/* return 1 if event matches, 0 otherwise (discard) */
@ -676,7 +672,10 @@ static bool is_string_field(struct ftrace_event_field *field)
static int is_legal_op(struct ftrace_event_field *field, int op)
{
if (is_string_field(field) && (op != OP_EQ && op != OP_NE))
if (is_string_field(field) &&
(op != OP_EQ && op != OP_NE && op != OP_GLOB))
return 0;
if (!is_string_field(field) && op == OP_GLOB)
return 0;
return 1;
@ -761,15 +760,13 @@ static int filter_add_pred(struct filter_parse_state *ps,
}
if (is_string_field(field)) {
ret = filter_build_regex(pred);
if (ret)
return ret;
filter_build_regex(pred);
if (field->filter_type == FILTER_STATIC_STRING) {
fn = filter_pred_string;
pred->regex.field_len = field->size;
} else if (field->filter_type == FILTER_DYN_STRING)
fn = filter_pred_strloc;
fn = filter_pred_strloc;
else {
fn = filter_pred_pchar;
pred->regex.field_len = strlen(pred->regex.pattern);