btrfs-progs: mkfs: do not truncate the image when --rootdir is set

With the rootdir option we try to guess the final size of the image and
fill it with zeros, preceded by truncation. After patch

"Btrfs-progs: Do not force mixed block group creation unless '-M' option
 is specified"

the misc test 002 will fail, because of the non-mixed mode. I think we
should not touch the image size (no change for block devices) and try to
fit into whatever is provided by user.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/mkfs.c b/mkfs.c
index 72ee2904..0ea39f38 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -926,7 +926,7 @@ fail_no_dir:
 static int open_target(char *output_name)
 {
 	int output_fd;
-	output_fd = open(output_name, O_CREAT | O_RDWR | O_TRUNC,
+	output_fd = open(output_name, O_CREAT | O_RDWR,
 		         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
 
 	return output_fd;