Use O_EXCL when opening component devices to be assembled into an array

[thirdparty/mdadm.git] / Manage.c

diff --git a/Manage.c b/Manage.c
index 883509549118972559daee567730d520b8591caa..b323fd3c241b514c24a3138b7f332e09c8841fd8 100644 (file)
--- a/Manage.c
+++ b/Manage.c
@@ -194,6 +194,14 @@ int Manage_subdevs(char *devname, int fd,
                        return 1;
                case 'a':
                        /* add the device - hot or cold */
+                       /* Make sure it isn' in use (in 2.6 or later) */
+                       fd = open(dv->devname, O_RDONLY|O_EXCL);
+                       if (fd < 0) {
+                               fprintf(stderr, Name ": Cannot open %s: %s\n",
+                                       dv->devname, strerror(errno));
+                               return 1;
+                       }
+                       close(fd);
                        if (ioctl(fd, HOT_ADD_DISK, (unsigned long)stb.st_rdev)==0) {
                                fprintf(stderr, Name ": hot added %s\n",
                                        dv->devname);