btrfs-progs: cmd_start_replace() to use test_dev_for_mkfs()

test_dev_for_mkfs() is a common place where
we check if a device is fit for the btrfs use.
cmd_start_replace() should make use of test_dev_for_mkfs(),
and here the test_dev_for_mkfs() is further enhanced
to fit the cmd_start_replace() needs.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/utils.c b/utils.c
index 15b991ff..c1469a9b 100644
--- a/utils.c
+++ b/utils.c
@@ -1807,6 +1807,7 @@ int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
 {
 	int ret, fd;
 	size_t sz = 100;
+	struct stat st;
 
 	ret = is_swap_device(file);
 	if (ret < 0) {
@@ -1841,6 +1842,15 @@ int test_dev_for_mkfs(char *file, int force_overwrite, char *estr)
 			strerror(errno));
 		return 1;
 	}
+	if (fstat(fd, &st)) {
+		snprintf(estr, sz, "unable to stat %s: %s\n", file,
+			strerror(errno));
+		return 1;
+	}
+	if (!S_ISBLK(st.st_mode)) {
+		fprintf(stderr, "'%s' is not a block device\n", file);
+		return 1;
+	}
 	close(fd);
 	return 0;
 }