check if partition is mounted before mkfs

This saves from the blunder of formatting a live mounted filesystem.
This can be extended to get the mount flags of the filesystem
mounted.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/mkfs.c b/mkfs.c
index 49f73083..8d7530f2 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -197,6 +197,15 @@ int main(int ac, char **av)
 		print_usage();
 
 	file = av[optind++];
+	ret = check_mounted(file);
+	if (ret < 0) {
+		fprintf(stderr, "error checking %s mount status\n", file);
+		exit(1);
+	}
+	if (ret == 1) {
+		fprintf(stderr, "%s is mounted\n", file);
+		exit(1);
+	}
 	ac--;
 	fd = open(file, O_RDWR);
 	if (fd < 0) {
@@ -241,6 +250,16 @@ int main(int ac, char **av)
 	zero_end = 1;
 	while(ac-- > 0) {
 		file = av[optind++];
+		ret = check_mounted(file);
+		if (ret < 0) {
+			fprintf(stderr, "error checking %s mount status\n",
+				file);
+			exit(1);
+		}
+		if (ret == 1) {
+			fprintf(stderr, "%s is mounted\n", file);
+			exit(1);
+		}
 		fd = open(file, O_RDWR);
 		if (fd < 0) {
 			fprintf(stderr, "unable to open %s\n", file);