autofs: refactor parse_options()

Seperate out parts of parse_options() that will match better the
individual option processing used in the mount API to further simplify
the upcoming conversion.
Signed-off-by: Ian Kent <raven@themaw.net>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Message-Id: <20230922041215.13675-6-raven@themaw.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/autofs/inode.c

@@ -167,31 +167,19 @@ static int autofs_parse_fd(struct autofs_sb_info *sbi, int fd)
 	return 0;
 }
 
-static int parse_options(char *options,
-			 struct inode *root, int *pgrp, bool *pgrp_set,
+static int autofs_parse_param(char *optstr, struct inode *root,
+			      int *pgrp, bool *pgrp_set,
 			      struct autofs_sb_info *sbi)
 {
-	char *p;
 	substring_t args[MAX_OPT_ARGS];
 	int option;
 	int pipefd = -1;
 	kuid_t uid;
 	kgid_t gid;
-	int ret;
-
-	root->i_uid = current_uid();
-	root->i_gid = current_gid();
-
-	if (!options)
-		return 1;
-
-	while ((p = strsep(&options, ",")) != NULL) {
 	int token;
+	int ret;
 
-		if (!*p)
-			continue;
-
-		token = match_token(p, tokens, args);
+	token = match_token(optstr, tokens, args);
 	switch (token) {
 	case Opt_fd:
 		if (match_int(args, &pipefd))
@@ -246,11 +234,31 @@ static int parse_options(char *options,
 		break;
 	case Opt_ignore:
 		sbi->flags |= AUTOFS_SBI_IGNORE;
-			break;
-		default:
-			return 1;
 	}
+
+	return 0;
+}
+
+static int parse_options(char *options,
+			 struct inode *root, int *pgrp, bool *pgrp_set,
+			 struct autofs_sb_info *sbi)
+{
+	char *p;
+
+	root->i_uid = current_uid();
+	root->i_gid = current_gid();
+
+	if (!options)
+		return 1;
+
+	while ((p = strsep(&options, ",")) != NULL) {
+		if (!*p)
+			continue;
+
+		if (autofs_parse_param(p, root, pgrp, pgrp_set, sbi))
+			return 1;
 	}
+
 	return (sbi->pipefd < 0);
 }