Add mbr pseudo metadata handler.

[thirdparty/mdadm.git] / Kill.c

diff --git a/Kill.c b/Kill.c
index 96b270f278db10d6361a8c45d17798db75dd3068..f5c30e97ea61f074c4ef5568bc993c2d54a0f2ea 100644 (file)
--- a/Kill.c
+++ b/Kill.c
@@ -1,7 +1,7 @@
 /*
  * mdadm - manage Linux "md" devices aka RAID arrays.
  *
- * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
+ * 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
@@ -34,32 +29,35 @@
 #include       "md_u.h"
 #include       "md_p.h"
 
-int Kill(char *dev, int force, int quiet, int noexcl)
+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;
-       struct supertype *st;
 
        if (force)
                noexcl = 1;
-       fd = open(dev, O_RDWR|(force ? 0 : O_EXCL));
+       fd = open(dev, O_RDWR|(noexcl ? 0 : O_EXCL));
        if (fd < 0) {
                if (!quiet)
                        fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
                                dev);
-               close(fd);
-               return 1;
+               return 2;
        }
-       st = guess_super(fd);
-       if (st == NULL) {
+       if (st == NULL)
+               st = guess_super(fd);
+       if (st == NULL || st->ss->init_super == NULL) {
                if (!quiet)
                        fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
                close(fd);
-               return 1;
+               return 2;
        }
        rv = st->ss->load_super(st, fd, dev);
        if (force && rv >= 2)
@@ -81,3 +79,81 @@ int Kill(char *dev, int force, int quiet, int noexcl)
        close(fd);
        return rv;
 }
+
+int Kill_subarray(char *dev, char *subarray, int quiet)
+{
+       /* Delete a subarray out of a container, the subarry must be
+        * inactive.  The subarray string must be a subarray index
+        * number.
+        *
+        * 0 = successfully deleted subarray from all container members
+        * 1 = failed to sync metadata to one or more devices
+        * 2 = failed to find the container, subarray, or other resource
+        *     issue
+        */
+       struct supertype supertype, *st = &supertype;
+       int fd, rv = 2;
+
+       memset(st, 0, sizeof(*st));
+
+       if (snprintf(st->subarray, sizeof(st->subarray), "%s", subarray) >=
+           (int)sizeof(st->subarray)) {
+               if (!quiet)
+                       fprintf(stderr,
+                               Name ": Input overflow for subarray '%s' > %zu bytes\n",
+                               subarray, sizeof(st->subarray) - 1);
+               return 2;
+       }
+
+       fd = open_subarray(dev, st, quiet);
+       if (fd < 0)
+               return 2;
+
+       if (!st->ss->kill_subarray) {
+               if (!quiet)
+                       fprintf(stderr,
+                               Name ": Operation not supported for %s metadata\n",
+                               st->ss->name);
+               goto free_super;
+       }
+
+       if (is_subarray_active(subarray, st->devname)) {
+               if (!quiet)
+                       fprintf(stderr,
+                               Name ": Subarray-%s still active, aborting\n",
+                               subarray);
+               goto free_super;
+       }
+
+       if (mdmon_running(st->devnum))
+               st->update_tail = &st->updates;
+
+       /* ok we've found our victim, drop the axe */
+       rv = st->ss->kill_subarray(st);
+       if (rv) {
+               if (!quiet)
+                       fprintf(stderr,
+                               Name ": Failed to delete subarray-%s from %s\n",
+                               subarray, dev);
+               goto free_super;
+       }
+
+       /* FIXME these routines do not report success/failure */
+       if (st->update_tail)
+               flush_metadata_updates(st);
+       else
+               st->ss->sync_metadata(st);
+
+       if (!quiet)
+               fprintf(stderr,
+                       Name ": Deleted subarray-%s from %s, UUIDs may have changed\n",
+                       subarray, dev);
+
+       rv = 0;
+
+ free_super:
+       st->ss->free_super(st);
+       close(fd);
+
+       return rv;
+}