Kill: fix when zeroing busy devices.

mdadm should not wait indefinitely when it trys to reset
superblock on device which is busy (cannot be opened).

Acked-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

2 files changed, 6 insertions, 3 deletions

diff --git a/Kill.c b/Kill.c
index 63442a6..e738978 100644
--- a/Kill.c
+++ b/Kill.c
@@ -34,6 +34,10 @@ int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl)
 	/*
 	 * Nothing fancy about Kill.  It just zeroes out a superblock
 	 * Definitely not safe.
+	 * Returns:
+	 *  0 - a zero superblock was successfully written out
+	 *  1 - failed to write the zero superblock
+	 *  2 - failed to open the device or find a superblock.
 	 */
 
 	int fd, rv = 0;
@@ -45,8 +49,7 @@ int Kill(char *dev, struct supertype *st, int force, int quiet, int noexcl)
 		if (!quiet)
 			fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
 				dev);
-		close(fd);
-		return 1;
+		return 2;
 	}
 	if (st == NULL)
 		st = guess_super(fd);
diff --git a/mdadm.c b/mdadm.c
index d235b2a..be4fbf6 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1367,7 +1367,7 @@ int main(int argc, char *argv[])
 						do {
 							rv |= Kill(dv->devname, NULL, force, q, 0);
 							q = 1;
-						} while ((rv & 2) == 0);
+						} while (rv == 0);
 						rv &= ~2;
 					}
 					continue;