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https://github.com/systemd/systemd.git
synced 2024-12-25 01:34:28 +03:00
cache uid/gid during rule parsing
This cuts down the number of parsing /etc/group from ~700 to 11, with some large rule files installed.
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f6bb9e981a
commit
154a7b8428
@ -81,7 +81,7 @@ int main(int argc, char *argv[])
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goto exit;
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}
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rules = udev_rules_new(udev, 0);
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rules = udev_rules_new(udev, 1);
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util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
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util_strlcat(syspath, devpath, sizeof(syspath));
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@ -31,6 +31,7 @@
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#define PREALLOC_TOKEN 2048
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#define PREALLOC_STRBUF 32 * 1024
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/* KEY=="", KEY!="", KEY+="", KEY="", KEY:="" */
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enum key_operation {
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KEY_OP_UNSET,
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KEY_OP_MATCH,
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@ -48,6 +49,7 @@ static const char *operation_str[] = {
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[KEY_OP_ASSIGN_FINAL] = "assign-final",
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};
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/* tokens of a rule are sorted/handled in this order */
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enum token_type {
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TK_UNDEF,
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TK_RULE,
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@ -187,19 +189,39 @@ struct rule_tmp {
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unsigned int token_cur;
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};
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struct uid_gid {
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unsigned int name_off;
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union {
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uid_t uid;
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gid_t gid;
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};
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};
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struct udev_rules {
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struct udev *udev;
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int resolve_names;
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/* every key in the rules file becomes a token */
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struct token *tokens;
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unsigned int token_cur;
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unsigned int token_max;
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/* all key strings are copied to a single string buffer */
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char *buf;
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size_t buf_cur;
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size_t buf_max;
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unsigned int buf_count;
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/* during rule parsing, we cache uid/gid lookup results */
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struct uid_gid *uids;
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unsigned int uids_cur;
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unsigned int uids_max;
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struct uid_gid *gids;
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unsigned int gids_cur;
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unsigned int gids_max;
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};
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/* we could lookup and return existing strings, or tails of strings */
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/* NOTE: we could lookup and return existing strings, or tails of strings */
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static int add_string(struct udev_rules *rules, const char *str)
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{
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size_t len = strlen(str)+1;
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@ -216,8 +238,8 @@ static int add_string(struct udev_rules *rules, const char *str)
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/* double the buffer size */
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add = rules->buf_max;
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if (add < len)
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add = len * 2;
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if (add < len * 8)
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add = len * 8;
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buf = realloc(rules->buf, rules->buf_max + add);
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if (buf == NULL)
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@ -243,8 +265,8 @@ static int add_token(struct udev_rules *rules, struct token *token)
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/* double the buffer size */
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add = rules->token_max;
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if (add < 1)
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add = 2;
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if (add < 8)
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add = 8;
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tokens = realloc(rules->tokens, (rules->token_max + add ) * sizeof(struct token));
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if (tokens == NULL)
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@ -258,6 +280,92 @@ static int add_token(struct udev_rules *rules, struct token *token)
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return 0;
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}
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static uid_t add_uid(struct udev_rules *rules, const char *owner)
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{
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unsigned int i;
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uid_t uid;
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unsigned int off;
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/* lookup, if we know it already */
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for (i = 0; i < rules->uids_cur; i++) {
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off = rules->uids[i].name_off;
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if (strcmp(&rules->buf[off], owner) == 0) {
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uid = rules->uids[i].uid;
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dbg(rules->udev, "return existing %u for '%s'\n", uid, owner);
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return uid;
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}
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}
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uid = util_lookup_user(rules->udev, owner);
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/* grow buffer if needed */
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if (rules->uids_cur+1 >= rules->uids_max) {
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struct uid_gid *uids;
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unsigned int add;
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/* double the buffer size */
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add = rules->uids_max;
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if (add < 1)
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add = 8;
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uids = realloc(rules->uids, (rules->uids_max + add ) * sizeof(struct uid_gid));
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if (uids == NULL)
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return uid;
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info(rules->udev, "extend uids from %u to %u\n", rules->uids_max, rules->uids_max + add);
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rules->uids = uids;
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rules->uids_max += add;
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}
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rules->uids[rules->uids_cur].uid = uid;
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off = add_string(rules, owner);
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if (off <= 0)
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return uid;
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rules->uids[rules->uids_cur].name_off = off;
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rules->uids_cur++;
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return uid;
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}
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static gid_t add_gid(struct udev_rules *rules, const char *group)
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{
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unsigned int i;
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gid_t gid;
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unsigned int off;
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/* lookup, if we know it already */
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for (i = 0; i < rules->gids_cur; i++) {
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off = rules->gids[i].name_off;
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if (strcmp(&rules->buf[off], group) == 0) {
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gid = rules->gids[i].gid;
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info(rules->udev, "return existing %u for '%s'\n", gid, group);
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return gid;
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}
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}
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gid = util_lookup_group(rules->udev, group);
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/* grow buffer if needed */
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if (rules->gids_cur+1 >= rules->gids_max) {
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struct uid_gid *gids;
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unsigned int add;
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/* double the buffer size */
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add = rules->gids_max;
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if (add < 1)
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add = 8;
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gids = realloc(rules->gids, (rules->gids_max + add ) * sizeof(struct uid_gid));
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if (gids == NULL)
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return gid;
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info(rules->udev, "extend gids from %u to %u\n", rules->gids_max, rules->gids_max + add);
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rules->gids = gids;
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rules->gids_max += add;
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}
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rules->gids[rules->gids_cur].gid = gid;
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off = add_string(rules, group);
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if (off <= 0)
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return gid;
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rules->gids[rules->gids_cur].name_off = off;
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rules->gids_cur++;
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return gid;
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}
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static int import_property_from_string(struct udev_device *dev, char *line)
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{
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struct udev *udev = udev_device_get_udev(dev);
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@ -1148,7 +1256,7 @@ static int add_rule(struct udev_rules *rules, char *line,
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if (endptr[0] == '\0') {
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rule_add_token(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
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} else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
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uid = util_lookup_user(rules->udev, value);
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uid = add_uid(rules, value);
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rule_add_token(&rule_tmp, TK_A_OWNER_ID, op, NULL, &uid);
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} else {
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rule_add_token(&rule_tmp, TK_A_OWNER, op, value, NULL);
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@ -1165,7 +1273,7 @@ static int add_rule(struct udev_rules *rules, char *line,
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if (endptr[0] == '\0') {
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rule_add_token(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
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} else if (rules->resolve_names && strchr("$%", value[0]) == NULL) {
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gid = util_lookup_group(rules->udev, value);
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gid = add_gid(rules, value);
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rule_add_token(&rule_tmp, TK_A_GROUP_ID, op, NULL, &gid);
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} else {
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rule_add_token(&rule_tmp, TK_A_GROUP, op, value, NULL);
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@ -1476,7 +1584,16 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
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end_token.type = TK_END;
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add_token(rules, &end_token);
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/* shrink allocate buffers */
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/* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */
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prev_rule = 0;
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for (i = 1; i < rules->token_cur; i++) {
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if (rules->tokens[i].type == TK_RULE) {
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rules->tokens[prev_rule].rule.next_rule = i;
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prev_rule = i;
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}
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}
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/* shrink allocated token and string buffer */
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if (rules->token_cur < rules->token_max) {
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struct token *tokens;
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@ -1498,14 +1615,16 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
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info(udev, "shrunk to %lu bytes tokens (%u * %zu bytes), %zu bytes buffer\n",
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rules->token_max * sizeof(struct token), rules->token_max, sizeof(struct token), rules->buf_max);
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/* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */
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prev_rule = 0;
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for (i = 1; i < rules->token_cur; i++) {
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if (rules->tokens[i].type == TK_RULE) {
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rules->tokens[prev_rule].rule.next_rule = i;
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prev_rule = i;
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}
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}
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/* cleanup uid/gid cache */
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free(rules->uids);
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rules->uids = NULL;
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rules->uids_cur = 0;
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rules->uids_max = 0;
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free(rules->gids);
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rules->gids = NULL;
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rules->gids_cur = 0;
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rules->gids_max = 0;
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dump_rules(rules);
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return rules;
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}
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@ -1516,6 +1635,8 @@ void udev_rules_unref(struct udev_rules *rules)
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return;
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free(rules->tokens);
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free(rules->buf);
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free(rules->uids);
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free(rules->gids);
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free(rules);
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}
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@ -89,7 +89,7 @@ int udevadm_test(struct udev *udev, int argc, char *argv[])
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"some values may be different, or not available at a simulation run.\n"
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"\n");
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rules = udev_rules_new(udev, 0);
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rules = udev_rules_new(udev, 1);
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if (rules == NULL) {
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fprintf(stderr, "error reading rules\n");
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rc = 1;
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