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determine at rule parse time if we need to call fnmatch()

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This cuts down the large rule set's 120.000 calls to fnmatch() to
51.000, and we can just call strcmp for the simple matches.
This commit is contained in:
Kay Sievers 2008-10-24 13:32:32 +02:00
parent b0f7409f24
commit ac218d9cc8
1 changed files with 125 additions and 40 deletions
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165
udev/udev-rules.c
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@ -45,18 +45,37 @@ enum operation_type {
};
static const char *operation_str[] = {
[OP_UNSET] = "UNSET",
[OP_MATCH] = "match",
[OP_NOMATCH] = "nomatch",
[OP_MATCH_MAX] = "match-max",
[OP_MATCH_MAX] = "MATCH_MAX",
[OP_ADD] = "add",
[OP_ASSIGN] = "assign",
[OP_ASSIGN_FINAL] = "assign-final",
};
enum string_glob_type {
GL_UNSET,
GL_PLAIN,
GL_GLOB,
GL_SPLIT,
GL_SPLIT_GLOB,
GL_FORMAT,
};
static const char *string_glob_str[] = {
[GL_UNSET] = "UNSET",
[GL_PLAIN] = "plain",
[GL_GLOB] = "glob",
[GL_SPLIT] = "split",
[GL_SPLIT_GLOB] = "split-glob",
[GL_FORMAT] = "format",
};
/* tokens of a rule are sorted/handled in this order */
enum token_type {
TK_UNDEF,
TK_UNSET,
TK_RULE,
TK_M_ACTION, /* val */
@ -82,6 +101,7 @@ enum token_type {
TK_M_IMPORT_PROG, /* val */
TK_M_IMPORT_PARENT, /* val */
TK_M_RESULT, /* val */
TK_M_MAX,
TK_A_IGNORE_DEVICE,
TK_A_STRING_ESCAPE_NONE,
@ -108,7 +128,7 @@ enum token_type {
};
static const char *token_str[] = {
[TK_UNDEF] = "UNDEF",
[TK_UNSET] = "UNSET",
[TK_RULE] = "RULE",
[TK_M_ACTION] = "M ACTION",
@ -134,6 +154,7 @@ static const char *token_str[] = {
[TK_M_IMPORT_PROG] = "M IMPORT_PROG",
[TK_M_IMPORT_PARENT] = "M MPORT_PARENT",
[TK_M_RESULT] = "M RESULT",
[TK_M_MAX] = "M MAX",
[TK_A_IGNORE_DEVICE] = "A IGNORE_DEVICE",
[TK_A_STRING_ESCAPE_NONE] = "A STRING_ESCAPE_NONE",
@ -168,7 +189,8 @@ struct token {
unsigned int filename_off;
} rule;
struct {
enum operation_type op;
unsigned short op;
unsigned short glob;
unsigned int value_off;
union {
unsigned int attr_off;
@ -339,7 +361,7 @@ static gid_t add_gid(struct udev_rules *rules, const char *group)
off = rules->gids[i].name_off;
if (strcmp(&rules->buf[off], group) == 0) {
gid = rules->gids[i].gid;
info(rules->udev, "return existing %u for '%s'\n", gid, group);
dbg(rules->udev, "return existing %u for '%s'\n", gid, group);
return gid;
}
}
@ -661,13 +683,14 @@ static int get_key(struct udev *udev, char **line, char **key, enum operation_ty
if (linepos[0] == '\0')
return -1;
/* get the value*/
/* get the value */
if (linepos[0] == '"')
linepos++;
else
return -1;
*value = linepos;
/* terminate */
temp = strchr(linepos, '"');
if (!temp)
return -1;
@ -707,7 +730,9 @@ static int rule_add_token(struct rule_tmp *rule_tmp, enum token_type type,
{
struct token *token = &rule_tmp->token[rule_tmp->token_cur];
const char *attr = data;
mode_t mode = 0000;
enum string_glob_type glob;
memset(token, 0x00, sizeof(struct token));
switch (type) {
case TK_M_ACTION:
@ -743,10 +768,9 @@ static int rule_add_token(struct rule_tmp *rule_tmp, enum token_type type,
token->key.attr_off = add_string(rule_tmp->rules, attr);
break;
case TK_M_TEST:
if (data != NULL)
mode = *(mode_t *)data;
token->key.value_off = add_string(rule_tmp->rules, value);
token->key.mode = mode;
if (data != NULL)
token->key.mode = *(mode_t *)data;
break;
case TK_A_IGNORE_DEVICE:
case TK_A_STRING_ESCAPE_NONE:
@ -778,13 +802,39 @@ static int rule_add_token(struct rule_tmp *rule_tmp, enum token_type type,
break;
case TK_RULE:
case TK_M_PARENTS_MAX:
case TK_M_MAX:
case TK_END:
case TK_UNDEF:
case TK_UNSET:
err(rule_tmp->rules->udev, "wrong type %u\n", type);
return -1;
}
glob = GL_PLAIN;
if (value != NULL) {
if (type < TK_M_MAX) {
/* check if we need to split or call fnmatch() while matching rules */
int has_split = 0;
int has_glob = 0;
has_split = (strchr(value, '|') != NULL);
has_glob = (strchr(value, '*') != NULL || strchr(value, '?') != NULL ||
strchr(value, '[') != NULL || strchr(value, ']') != NULL);
if (has_split && has_glob)
glob = GL_SPLIT_GLOB;
else if (has_split)
glob = GL_SPLIT;
else if (has_glob)
glob = GL_GLOB;
} else {
/* check if we need to substitute format strings for matching rules */
if (strchr(value, '%') != NULL || strchr(value, '$') != NULL)
glob = GL_FORMAT;
}
}
token->type = type;
token->key.op = op;
token->key.glob = glob;
rule_tmp->token_cur++;
if (rule_tmp->token_cur >= ARRAY_SIZE(rule_tmp->token)) {
err(rule_tmp->rules->udev, "temporary rule array too small\n");
@ -798,6 +848,7 @@ static void dump_token(struct udev_rules *rules, struct token *token)
{
enum token_type type = token->type;
enum operation_type op = token->key.op;
enum string_glob_type glob = token->key.glob;
const char *value = &rules->buf[token->key.value_off];
const char *attr = &rules->buf[token->key.attr_off];
@ -837,14 +888,16 @@ static void dump_token(struct udev_rules *rules, struct token *token)
case TK_A_GROUP:
case TK_A_MODE:
case TK_A_RUN:
dbg(rules->udev, "%s %s '%s'\n", token_str[type], operation_str[op], value);
dbg(rules->udev, "%s %s '%s'(%s)\n",
token_str[type], operation_str[op], value, string_glob_str[glob]);
break;
case TK_M_ATTR:
case TK_M_ATTRS:
case TK_M_ENV:
case TK_A_ATTR:
case TK_A_ENV:
dbg(rules->udev, "%s %s '%s' '%s'\n", token_str[type], operation_str[op], attr, value);
dbg(rules->udev, "%s %s '%s' '%s'(%s)\n",
token_str[type], operation_str[op], attr, value, string_glob_str[glob]);
break;
case TK_A_IGNORE_DEVICE:
case TK_A_STRING_ESCAPE_NONE:
@ -854,7 +907,8 @@ static void dump_token(struct udev_rules *rules, struct token *token)
dbg(rules->udev, "%s\n", token_str[type]);
break;
case TK_M_TEST:
dbg(rules->udev, "%s %s '%s' %#o\n", token_str[type], operation_str[op], value, token->key.mode);
dbg(rules->udev, "%s %s '%s'(%s) %#o\n",
token_str[type], operation_str[op], value, string_glob_str[glob], token->key.mode);
break;
case TK_A_NUM_FAKE_PART:
dbg(rules->udev, "%s %u\n", token_str[type], token->key.num_fake_part);
@ -881,7 +935,7 @@ static void dump_token(struct udev_rules *rules, struct token *token)
dbg(rules->udev, "* %s\n", token_str[type]);
break;
case TK_M_PARENTS_MAX:
case TK_UNDEF:
case TK_UNSET:
dbg(rules->udev, "unknown type %u\n", type);
break;
}
@ -911,15 +965,15 @@ static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
unsigned int end = rule_tmp->token_cur;
for (i = 0; i < rule_tmp->token_cur; i++) {
enum token_type next_val = TK_UNDEF;
enum token_type next_val = TK_UNSET;
unsigned int next_idx;
unsigned int j;
/* find smallest value */
for (j = start; j < end; j++) {
if (rule_tmp->token[j].type == TK_UNDEF)
if (rule_tmp->token[j].type == TK_UNSET)
continue;
if (next_val == TK_UNDEF || rule_tmp->token[j].type < next_val) {
if (next_val == TK_UNSET || rule_tmp->token[j].type < next_val) {
next_val = rule_tmp->token[j].type;
next_idx = j;
}
@ -928,7 +982,7 @@ static int sort_token(struct udev_rules *rules, struct rule_tmp *rule_tmp)
/* add token and mark done */
if (add_token(rules, &rule_tmp->token[next_idx]) != 0)
return -1;
rule_tmp->token[next_idx].type = TK_UNDEF;
rule_tmp->token[next_idx].type = TK_UNSET;
/* shrink range */
if (next_idx == start)
@ -957,7 +1011,7 @@ static int add_rule(struct udev_rules *rules, char *line,
while (1) {
char *key;
char *value;
enum operation_type op = OP_UNSET;
enum operation_type op;
if (get_key(rules->udev, &linepos, &key, &op, &value) != 0)
break;
@ -1655,26 +1709,56 @@ static int match_key(struct udev_rules *rules, struct token *token, const char *
if (val == NULL)
val = "";
/* look for a matching string, parts are separated by '|' */
if (strchr(key_value, '|') != NULL) {
char value[UTIL_PATH_SIZE];
util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value));
key_value = value;
while (key_value != NULL) {
pos = strchr(key_value, '|');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
dbg(rules->udev, "match %s '%s' <-> '%s'\n", key_name, key_value, val);
match = (fnmatch(key_value, val, 0) == 0);
if (match)
break;
key_value = pos;
}
} else {
switch (token->key.glob) {
case GL_PLAIN:
match = (strcmp(key_value, val) == 0);
break;
case GL_GLOB:
match = (fnmatch(key_value, val, 0) == 0);
break;
case GL_SPLIT:
{
char value[UTIL_PATH_SIZE];
util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value));
key_value = value;
while (key_value != NULL) {
pos = strchr(key_value, '|');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
dbg(rules->udev, "match %s '%s' <-> '%s'\n", key_name, key_value, val);
match = (strcmp(key_value, val) == 0);
if (match)
break;
key_value = pos;
}
break;
}
case GL_SPLIT_GLOB:
{
char value[UTIL_PATH_SIZE];
util_strlcpy(value, &rules->buf[token->key.value_off], sizeof(value));
key_value = value;
while (key_value != NULL) {
pos = strchr(key_value, '|');
if (pos != NULL) {
pos[0] = '\0';
pos = &pos[1];
}
dbg(rules->udev, "match %s '%s' <-> '%s'\n", key_name, key_value, val);
match = (fnmatch(key_value, val, 0) == 0);
if (match)
break;
key_value = pos;
}
break;
}
case GL_FORMAT:
case GL_UNSET:
return -1;
}
if (match && (token->key.op == OP_MATCH)) {
@ -2217,8 +2301,9 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
break;
case TK_M_PARENTS_MAX:
case TK_M_MAX:
case TK_END:
case TK_UNDEF:
case TK_UNSET:
err(rules->udev, "wrong type %u\n", cur->type);
goto nomatch;
}