Btrfs-progs: record errno for ioctl DEFRAG_RANGE

In order to sparse exact error message, we need to record errno here.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>

diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index f3d3130..f41a72a 100644 (file)
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -431,6 +431,7 @@ static int cmd_defrag(int argc, char **argv)
                                close(fd);
                                break;
                        }
+                       e = errno;
                }
                if (ret) {
                        fprintf(stderr, "ERROR: defrag failed on %s - %s\n",