[PATCH] udevd: Shrink struct token to 12 bytes

[Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>]

Signed-off-by: Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>

diff --git a/udev/udev-rules.c b/udev/udev-rules.c
index e07cd32..a0564e2 100644
--- a/udev/udev-rules.c
+++ b/udev/udev-rules.c
@@ -144,20 +144,20 @@ enum token_type {
/* we try to pack stuff in a way that we take only 16 bytes per token */
struct token {
	union {
-		unsigned short type;		/* same as in rule and key */
+		unsigned char type;		/* same as in rule and key */
		struct {
-			unsigned short type;
-			unsigned short flags;
-			unsigned int next_rule;
+			unsigned char type;
+			unsigned char flags;
+			unsigned short token_count;
			unsigned int label_off;
			unsigned short filename_off;
			unsigned short filename_line;
		} rule;
		struct {
-			unsigned short type;
-			unsigned short flags;
-			unsigned short op;
-			unsigned short glob;
+			unsigned char type;
+			unsigned char flags;
+			unsigned char op;
+			unsigned char glob;
			unsigned int value_off;
			union {
				unsigned int attr_off;
@@ -274,10 +274,11 @@ static void dump_token(struct udev_rules *rules, struct token *token)
			const char *tk_ptr = (char *)token;
			unsigned int off = tk_ptr - tks_ptr;

-			dbg(rules->udev, "* RULE %s:%u, off: %u(%u), next: %u, label: '%s', flags: 0x%02x\n",
+			dbg(rules->udev, "* RULE %s:%u, off: %u(%u), token_count: %u(%u), label: '%s', flags: 0x%02x\n",
			    &rules->buf[token->rule.filename_off], token->rule.filename_line,
			    off / (unsigned int) sizeof(struct token), off,
-			    token->rule.next_rule,
+			    token->rule.token_count,
+			    token->rule.token_count * (unsigned int) sizeof(struct token),
			    &rules->buf[token->rule.label_off],
			    token->rule.flags);
			break;
@@ -1439,12 +1440,14 @@ static int add_rule(struct udev_rules *rules, char *line,
		goto invalid;

	/* add rule token */
+	rule_tmp.rule.rule.token_count = 1 + rule_tmp.token_cur;
	if (add_token(rules, &rule_tmp.rule) != 0)
		goto invalid;

	/* add tokens to list, sorted by type */
	if (sort_token(rules, &rule_tmp) != 0)
		goto invalid;
+
	return 0;
invalid:
	err(rules->udev, "invalid rule '%s:%u'\n", filename, lineno);
@@ -1689,15 +1692,6 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
	end_token.type = TK_END;
	add_token(rules, &end_token);

-	/* link all TK_RULE tokens to be able to fast-forward to next TK_RULE */
-	prev_rule = 0;
-	for (i = 1; i < rules->token_cur; i++) {
-		if (rules->tokens[i].type == TK_RULE) {
-			rules->tokens[prev_rule].rule.next_rule = i;
-			prev_rule = i;
-		}
-	}
-
	/* shrink allocated token and string buffer */
	if (rules->token_cur < rules->token_max) {
		struct token *tokens;
@@ -2426,10 +2420,8 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
		continue;
	nomatch:
		/* fast-forward to next rule */
-		idx = rule->rule.next_rule;
-		if (idx == 0)
-			return 0;
-		dbg(rules->udev, "forward to rule: %u\n", idx);
-		cur = &rules->tokens[idx];
+		cur = rule + rule->rule.token_count;
+		dbg(rules->udev, "forward to rule: %u\n",
+		                 (unsigned int) (cur - rules->tokens));
	}
}


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