Btrfs-progs: don't close the file descriptor 0 when closing a device

As we know, the file descriptor 0 is a special number, so we shouldn't
use it to initialize the file descriptor of the devices, or we might
close this special file descriptor by mistake when we close the devices.
"-1" is a better choice.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/btrfs-find-root.c b/btrfs-find-root.c
index 810d8358..3e1396d3 100644
--- a/btrfs-find-root.c
+++ b/btrfs-find-root.c
@@ -76,7 +76,10 @@ static int close_all_devices(struct btrfs_fs_info *fs_info)
 	list = &fs_info->fs_devices->devices;
 	list_for_each(next, list) {
 		device = list_entry(next, struct btrfs_device, dev_list);
-		close(device->fd);
+		if (device->fd != -1) {
+			close(device->fd);
+			device->fd = -1;
+		}
 	}
 	return 0;
 }