fix mdmon takeover

[thirdparty/mdadm.git] / Kill.c

diff --git a/Kill.c b/Kill.c
index 9441f73bb43f88ce4733ac7671e7c2cfc9dd94ab..e73897857dd15df767f8975fb841664ad74d964d 100644 (file)
--- a/Kill.c
+++ b/Kill.c
@@ -1,7 +1,7 @@
 /*
  * mdadm - manage Linux "md" devices aka RAID arrays.
  *
- * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
+ * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
  *
  *
  *    This program is free software; you can redistribute it and/or modify
@@ -19,12 +19,7 @@
  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
  *    Author: Neil Brown
- *    Email: <neilb@cse.unsw.edu.au>
- *    Paper: Neil Brown
- *           School of Computer Science and Engineering
- *           The University of New South Wales
- *           Sydney, 2052
- *           Australia
+ *    Email: <neilb@suse.de>
  *
  *    Added by Dale Stephenson
  *    steph@snapserver.com
@@ -34,48 +29,51 @@
 #include       "md_u.h"
 #include       "md_p.h"
 
-int Kill(char *dev, int force)
+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.
         */
 
-       mdp_super_t super;
        int fd, rv = 0;
-               
-       fd = open(dev, O_RDWR|O_EXCL);
+
+       if (force)
+               noexcl = 1;
+       fd = open(dev, O_RDWR|(noexcl ? 0 : O_EXCL));
        if (fd < 0) {
-               fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
-                       dev);
-               return 1;
-       } 
-       rv = load_super(fd, &super);
-       if (force && rv >= 5)
-               rv = 0; /* ignore bad data in superblock */
-       switch(rv) {
-       case 1:
-               fprintf(stderr, Name ": cannot file device size for %s: %s\n",
-                       dev, strerror(errno));
-               break;
-       case 2:
-               fprintf(stderr, Name ": %s is too small for md.\n", dev);
-               break;
-       case 3:
-       case 4:
-               fprintf(stderr, Name ": cannot access superblock on %s.\n", dev);
-               break;
-       case 5:
-       case 6:
-               fprintf(stderr, Name ": %s does not appear to have an MD superblock.\n", dev);
-               break;
-       }
-       if (!rv) {
-               memset(&super, 0, sizeof(super));
-               if (store_super(fd, &super)) {
-                       fprintf(stderr, Name ": Could not zero superblock on %s\n",
+               if (!quiet)
+                       fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
                                dev);
+               return 2;
+       }
+       if (st == NULL)
+               st = guess_super(fd);
+       if (st == NULL) {
+               if (!quiet)
+                       fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
+               close(fd);
+               return 2;
+       }
+       rv = st->ss->load_super(st, fd, dev);
+       if (force && rv >= 2)
+               rv = 0; /* ignore bad data in superblock */
+       if (rv== 0 || (force && rv >= 2)) {
+               st->ss->free_super(st);
+               st->ss->init_super(st, NULL, 0, "", NULL, NULL);
+               if (st->ss->store_super(st, fd)) {
+                       if (!quiet)
+                               fprintf(stderr, Name ": Could not zero superblock on %s\n",
+                                       dev);
                        rv = 1;
+               } else if (rv) {
+                       if (!quiet)
+                               fprintf(stderr, Name ": superblock zeroed anyway\n");
+                       rv = 0;
                }
        }
        close(fd);