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tracing/filters: Provide basic regex support

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This patch provides basic support for regular expressions in filters.

It supports the following types of regexp:

- *match_beginning
- *match_middle*
- match_end*
- !don't match

Example:
	cd /debug/tracing/events/bkl/lock_kernel
	echo 'file == "*reiserfs*"' > filter
	echo 1 > enable

           gedit-4941  [000]   457.735437: lock_kernel: depth: 0, fs/reiserfs/namei.c:334 reiserfs_lookup()
     sync_supers-227   [001]   461.379985: lock_kernel: depth: 0, fs/reiserfs/super.c:69 reiserfs_sync_fs()
     sync_supers-227   [000]   461.383096: lock_kernel: depth: 0, fs/reiserfs/journal.c:1069 flush_commit_list()
      reiserfs/1-1369  [001]   461.479885: lock_kernel: depth: 0, fs/reiserfs/journal.c:3509 flush_async_commits()

Every string is now handled as a regexp in the filter framework, which
helps to factorize the code for handling both simple strings and
regexp comparisons.

(The regexp parsing code has been wildly cherry picked from ftrace.c
written by Steve.)

v2: Simplify the whole and drop the filter_regex file

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
tirimbino
Frederic Weisbecker 16 years ago
parent f3f3f00924
commit 1889d20922
2 changed files with 157 additions and 25 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 27
      kernel/trace/trace.h
  2. 155
      kernel/trace/trace_events_filter.c

27
kernel/trace/trace.h
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@ -702,20 +702,29 @@ struct event_subsystem {
};
struct filter_pred;
struct regex;
typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
int val1, int val2);
typedef int (*regex_match_func)(char *str, struct regex *r, int len);
struct regex {
char pattern[MAX_FILTER_STR_VAL];
int len;
int field_len;
regex_match_func match;
};
struct filter_pred {
filter_pred_fn_t fn;
u64 val;
char str_val[MAX_FILTER_STR_VAL];
int str_len;
char *field_name;
int offset;
int not;
int op;
int pop_n;
filter_pred_fn_t fn;
u64 val;
struct regex regex;
char *field_name;
int offset;
int not;
int op;
int pop_n;
};
extern void print_event_filter(struct ftrace_event_call *call,

155
kernel/trace/trace_events_filter.c
Unescape View File

@ -195,9 +195,9 @@ static int filter_pred_string(struct filter_pred *pred, void *event,
char *addr = (char *)(event + pred->offset);
int cmp, match;
cmp = strncmp(addr, pred->str_val, pred->str_len);
cmp = pred->regex.match(addr, &pred->regex, pred->regex.field_len);
match = (!cmp) ^ pred->not;
match = cmp ^ pred->not;
return match;
}
@ -209,9 +209,9 @@ static int filter_pred_pchar(struct filter_pred *pred, void *event,
char **addr = (char **)(event + pred->offset);
int cmp, match;
cmp = strncmp(*addr, pred->str_val, pred->str_len);
cmp = pred->regex.match(*addr, &pred->regex, pred->regex.field_len);
match = (!cmp) ^ pred->not;
match = cmp ^ pred->not;
return match;
}
@ -235,9 +235,9 @@ static int filter_pred_strloc(struct filter_pred *pred, void *event,
char *addr = (char *)(event + str_loc);
int cmp, match;
cmp = strncmp(addr, pred->str_val, str_len);
cmp = pred->regex.match(addr, &pred->regex, str_len);
match = (!cmp) ^ pred->not;
match = cmp ^ pred->not;
return match;
}
@ -248,6 +248,126 @@ static int filter_pred_none(struct filter_pred *pred, void *event,
return 0;
}
/* Basic regex callbacks */
static int regex_match_full(char *str, struct regex *r, int len)
{
if (strncmp(str, r->pattern, len) == 0)
return 1;
return 0;
}
static int regex_match_front(char *str, struct regex *r, int len)
{
if (strncmp(str, r->pattern, len) == 0)
return 1;
return 0;
}
static int regex_match_middle(char *str, struct regex *r, int len)
{
if (strstr(str, r->pattern))
return 1;
return 0;
}
static int regex_match_end(char *str, struct regex *r, int len)
{
char *ptr = strstr(str, r->pattern);
if (ptr && (ptr[r->len] == 0))
return 1;
return 0;
}
enum regex_type {
MATCH_FULL,
MATCH_FRONT_ONLY,
MATCH_MIDDLE_ONLY,
MATCH_END_ONLY,
};
/*
* Pass in a buffer containing a regex and this function will
* set search to point to the search part of the buffer and
* return the type of search it is (see enum above).
* This does modify buff.
*
* Returns enum type.
* search returns the pointer to use for comparison.
* not returns 1 if buff started with a '!'
* 0 otherwise.
*/
static enum regex_type
filter_parse_regex(char *buff, int len, char **search, int *not)
{
int type = MATCH_FULL;
int i;
if (buff[0] == '!') {
*not = 1;
buff++;
len--;
} else
*not = 0;
*search = buff;
for (i = 0; i < len; i++) {
if (buff[i] == '*') {
if (!i) {
*search = buff + 1;
type = MATCH_END_ONLY;
} else {
if (type == MATCH_END_ONLY)
type = MATCH_MIDDLE_ONLY;
else
type = MATCH_FRONT_ONLY;
buff[i] = 0;
break;
}
}
}
return type;
}
static int filter_build_regex(struct filter_pred *pred)
{
struct regex *r = &pred->regex;
char *search, *dup;
enum regex_type type;
int not;
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);
switch (type) {
case MATCH_FULL:
r->match = regex_match_full;
break;
case MATCH_FRONT_ONLY:
r->match = regex_match_front;
break;
case MATCH_MIDDLE_ONLY:
r->match = regex_match_middle;
break;
case MATCH_END_ONLY:
r->match = regex_match_end;
break;
}
pred->not ^= not;
return 0;
}
/* return 1 if event matches, 0 otherwise (discard) */
int filter_match_preds(struct ftrace_event_call *call, void *rec)
{
@ -394,7 +514,7 @@ static void filter_clear_pred(struct filter_pred *pred)
{
kfree(pred->field_name);
pred->field_name = NULL;
pred->str_len = 0;
pred->regex.len = 0;
}
static int filter_set_pred(struct filter_pred *dest,
@ -658,21 +778,24 @@ static int filter_add_pred(struct filter_parse_state *ps,
}
if (is_string_field(field)) {
pred->str_len = field->size;
ret = filter_build_regex(pred);
if (ret)
return ret;
if (field->filter_type == FILTER_STATIC_STRING)
if (field->filter_type == FILTER_STATIC_STRING) {
fn = filter_pred_string;
else if (field->filter_type == FILTER_DYN_STRING)
fn = filter_pred_strloc;
pred->regex.field_len = field->size;
} else if (field->filter_type == FILTER_DYN_STRING)
fn = filter_pred_strloc;
else {
fn = filter_pred_pchar;
pred->str_len = strlen(pred->str_val);
pred->regex.field_len = strlen(pred->regex.pattern);
}
} else {
if (field->is_signed)
ret = strict_strtoll(pred->str_val, 0, &val);
ret = strict_strtoll(pred->regex.pattern, 0, &val);
else
ret = strict_strtoull(pred->str_val, 0, &val);
ret = strict_strtoull(pred->regex.pattern, 0, &val);
if (ret) {
parse_error(ps, FILT_ERR_ILLEGAL_INTVAL, 0);
return -EINVAL;
@ -1042,8 +1165,8 @@ static struct filter_pred *create_pred(int op, char *operand1, char *operand2)
return NULL;
}
strcpy(pred->str_val, operand2);
pred->str_len = strlen(operand2);
strcpy(pred->regex.pattern, operand2);
pred->regex.len = strlen(pred->regex.pattern);
pred->op = op;

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