[02/10] btrfs-progs: tune: consolidate return goto free-out

Commit Message

Anand Jain June 28, 2023, 11:56 a.m. UTC

The upcoming "--device" option requires memory to parse devices, which
should be freed before returning from the main() function. As a
preparation for adding the "--device" option to the "btrfstune" command,
provide a consolidated error return exit from the main function with a
"goto" labeled "free_out". The label "free_out" may not make sense
currently, but it will when the "--device" option is added.

There are several return statements within the main function, and
changing all of them in the main "--device" feature patch would deviate
from the actual for the feature changes. Hence, it made sense to create
a preparatory patch.

The return value for any failure remains the same as in the original code.

Signed-off-by: Anand Jain <[e-mail]>
---
 tune/main.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

Patch

diff --git a/tune/main.c b/tune/main.c
index 0ca1e01282c9..0c8872dcdee5 100644
--- a/tune/main.c
+++ b/tune/main.c
@@ -145,7 +145,7 @@  int BOX_MAIN(btrfstune)(int argc, char *argv[])
 	bool to_fst = false;
 	int csum_type = -1;
 	char *new_fsid_str = NULL;
-	int ret;
+	int ret = 1;
 	u64 super_flags = 0;
 	int fd = -1;
 
@@ -233,18 +233,18 @@  int BOX_MAIN(btrfstune)(int argc, char *argv[])
 	set_argv0(argv);
 	device = argv[optind];
 	if (check_argc_exact(argc - optind, 1))
-		return 1;
+		goto free_out;
 
 	if (random_fsid && new_fsid_str) {
 		error("random fsid can't be used with specified fsid");
-		return 1;
+		goto free_out;
 	}
 	if (!super_flags && !seeding_flag && !(random_fsid || new_fsid_str) &&
 	    !change_metadata_uuid && csum_type == -1 && !to_bg_tree &&
 	    !to_extent_tree && !to_fst) {
 		error("at least one option should be specified");
 		usage(&tune_cmd, 1);
-		return 1;
+		goto free_out;
 	}
 
 	if (new_fsid_str) {
@@ -253,18 +253,21 @@  int BOX_MAIN(btrfstune)(int argc, char *argv[])
 		ret = uuid_parse(new_fsid_str, tmp);
 		if (ret < 0) {
 			error("could not parse UUID: %s", new_fsid_str);
-			return 1;
+			ret = 1;
+			goto free_out;
 		}
 		if (!test_uuid_unique(new_fsid_str)) {
 			error("fsid %s is not unique", new_fsid_str);
-			return 1;
+			ret = 1;
+			goto free_out;
 		}
 	}
 
 	fd = open(device, O_RDWR);
 	if (fd < 0) {
 		error("mount check: cannot open %s: %m", device);
-		return 1;
+		ret = 1;
+		goto free_out;
 	}
 
 	ret = check_mounted_where(fd, device, NULL, 0, NULL,
@@ -273,18 +276,21 @@  int BOX_MAIN(btrfstune)(int argc, char *argv[])
 		errno = -ret;
 		error("could not check mount status of %s: %m", device);
 		close(fd);
-		return 1;
+		ret = 1;
+		goto free_out;
 	} else if (ret) {
 		error("%s is mounted", device);
 		close(fd);
-		return 1;
+		ret = 1;
+		goto free_out;
 	}
 
 	root = open_ctree_fd(fd, device, 0, ctree_flags);
 
 	if (!root) {
 		error("open ctree failed");
-		return 1;
+		ret = 1;
+		goto free_out;
 	}
 
  	if (to_bg_tree) {
@@ -431,5 +437,6 @@  out:
 	close_ctree(root);
 	btrfs_close_all_devices();
 
+free_out:
 	return ret;
 }